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70482933 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- E X P _ U T I L -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
8d0d46f4 | 9 | -- Copyright (C) 1992-2021, Free Software Foundation, Inc. -- |
70482933 RK |
10 | -- -- |
11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
70482933 RK |
14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
17 | -- for more details. You should have received a copy of the GNU General -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
70482933 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
70482933 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
2f7b7467 | 26 | with Aspects; use Aspects; |
70482933 | 27 | with Atree; use Atree; |
afbcdf5e | 28 | with Casing; use Casing; |
70482933 | 29 | with Checks; use Checks; |
59e54267 | 30 | with Debug; use Debug; |
76f9c7f4 BD |
31 | with Einfo; use Einfo; |
32 | with Einfo.Entities; use Einfo.Entities; | |
33 | with Einfo.Utils; use Einfo.Utils; | |
70482933 RK |
34 | with Elists; use Elists; |
35 | with Errout; use Errout; | |
f44fe430 | 36 | with Exp_Aggr; use Exp_Aggr; |
86cde7b1 | 37 | with Exp_Ch6; use Exp_Ch6; |
70482933 | 38 | with Exp_Ch7; use Exp_Ch7; |
bb072d1c | 39 | with Exp_Ch11; use Exp_Ch11; |
241ebe89 | 40 | with Ghost; use Ghost; |
70482933 RK |
41 | with Inline; use Inline; |
42 | with Itypes; use Itypes; | |
43 | with Lib; use Lib; | |
70482933 RK |
44 | with Nlists; use Nlists; |
45 | with Nmake; use Nmake; | |
46 | with Opt; use Opt; | |
47 | with Restrict; use Restrict; | |
6e937c1c | 48 | with Rident; use Rident; |
70482933 | 49 | with Sem; use Sem; |
a4100e55 | 50 | with Sem_Aux; use Sem_Aux; |
f63d601b HK |
51 | with Sem_Ch3; use Sem_Ch3; |
52 | with Sem_Ch6; use Sem_Ch6; | |
70482933 | 53 | with Sem_Ch8; use Sem_Ch8; |
f63d601b | 54 | with Sem_Ch12; use Sem_Ch12; |
88fa9a24 | 55 | with Sem_Ch13; use Sem_Ch13; |
f63d601b | 56 | with Sem_Disp; use Sem_Disp; |
90e491a7 | 57 | with Sem_Elab; use Sem_Elab; |
70482933 RK |
58 | with Sem_Eval; use Sem_Eval; |
59 | with Sem_Res; use Sem_Res; | |
758c442c | 60 | with Sem_Type; use Sem_Type; |
70482933 | 61 | with Sem_Util; use Sem_Util; |
76f9c7f4 | 62 | with Sinfo.Utils; use Sinfo.Utils; |
fbf5a39b | 63 | with Snames; use Snames; |
70482933 RK |
64 | with Stand; use Stand; |
65 | with Stringt; use Stringt; | |
66 | with Tbuild; use Tbuild; | |
67 | with Ttypes; use Ttypes; | |
70482933 RK |
68 | with Validsw; use Validsw; |
69 | ||
851e9f19 | 70 | with GNAT.HTable; |
70482933 RK |
71 | package body Exp_Util is |
72 | ||
f63d601b HK |
73 | --------------------------------------------------------- |
74 | -- Handling of inherited class-wide pre/postconditions -- | |
75 | --------------------------------------------------------- | |
76 | ||
77 | -- Following AI12-0113, the expression for a class-wide condition is | |
78 | -- transformed for a subprogram that inherits it, by replacing calls | |
79 | -- to primitive operations of the original controlling type into the | |
80 | -- corresponding overriding operations of the derived type. The following | |
81 | -- hash table manages this mapping, and is expanded on demand whenever | |
82 | -- such inherited expression needs to be constructed. | |
83 | ||
84 | -- The mapping is also used to check whether an inherited operation has | |
85 | -- a condition that depends on overridden operations. For such an | |
86 | -- operation we must create a wrapper that is then treated as a normal | |
87 | -- overriding. In SPARK mode such operations are illegal. | |
88 | ||
89 | -- For a given root type there may be several type extensions with their | |
90 | -- own overriding operations, so at various times a given operation of | |
91 | -- the root will be mapped into different overridings. The root type is | |
92 | -- also mapped into the current type extension to indicate that its | |
93 | -- operations are mapped into the overriding operations of that current | |
94 | -- type extension. | |
95 | ||
b619c88e | 96 | -- The contents of the map are as follows: |
f63d601b | 97 | |
b619c88e | 98 | -- Key Value |
f63d601b | 99 | |
b619c88e AC |
100 | -- Discriminant (Entity_Id) Discriminant (Entity_Id) |
101 | -- Discriminant (Entity_Id) Non-discriminant name (Entity_Id) | |
102 | -- Discriminant (Entity_Id) Expression (Node_Id) | |
103 | -- Primitive subprogram (Entity_Id) Primitive subprogram (Entity_Id) | |
104 | -- Type (Entity_Id) Type (Entity_Id) | |
105 | ||
106 | Type_Map_Size : constant := 511; | |
107 | ||
108 | subtype Type_Map_Header is Integer range 0 .. Type_Map_Size - 1; | |
109 | function Type_Map_Hash (Id : Entity_Id) return Type_Map_Header; | |
110 | ||
111 | package Type_Map is new GNAT.HTable.Simple_HTable | |
112 | (Header_Num => Type_Map_Header, | |
f63d601b | 113 | Key => Entity_Id, |
b619c88e | 114 | Element => Node_Or_Entity_Id, |
f63d601b | 115 | No_element => Empty, |
b619c88e | 116 | Hash => Type_Map_Hash, |
f63d601b HK |
117 | Equal => "="); |
118 | ||
70482933 RK |
119 | ----------------------- |
120 | -- Local Subprograms -- | |
121 | ----------------------- | |
122 | ||
123 | function Build_Task_Array_Image | |
124 | (Loc : Source_Ptr; | |
125 | Id_Ref : Node_Id; | |
7bc1c7df | 126 | A_Type : Entity_Id; |
bebbff91 | 127 | Dyn : Boolean := False) return Node_Id; |
273adcdf AC |
128 | -- Build function to generate the image string for a task that is an array |
129 | -- component, concatenating the images of each index. To avoid storage | |
130 | -- leaks, the string is built with successive slice assignments. The flag | |
131 | -- Dyn indicates whether this is called for the initialization procedure of | |
132 | -- an array of tasks, or for the name of a dynamically created task that is | |
133 | -- assigned to an indexed component. | |
70482933 RK |
134 | |
135 | function Build_Task_Image_Function | |
136 | (Loc : Source_Ptr; | |
137 | Decls : List_Id; | |
138 | Stats : List_Id; | |
bebbff91 | 139 | Res : Entity_Id) return Node_Id; |
273adcdf AC |
140 | -- Common processing for Task_Array_Image and Task_Record_Image. Build |
141 | -- function body that computes image. | |
70482933 RK |
142 | |
143 | procedure Build_Task_Image_Prefix | |
144 | (Loc : Source_Ptr; | |
145 | Len : out Entity_Id; | |
146 | Res : out Entity_Id; | |
147 | Pos : out Entity_Id; | |
148 | Prefix : Entity_Id; | |
149 | Sum : Node_Id; | |
86cde7b1 RD |
150 | Decls : List_Id; |
151 | Stats : List_Id); | |
273adcdf AC |
152 | -- Common processing for Task_Array_Image and Task_Record_Image. Create |
153 | -- local variables and assign prefix of name to result string. | |
70482933 RK |
154 | |
155 | function Build_Task_Record_Image | |
156 | (Loc : Source_Ptr; | |
157 | Id_Ref : Node_Id; | |
bebbff91 | 158 | Dyn : Boolean := False) return Node_Id; |
273adcdf AC |
159 | -- Build function to generate the image string for a task that is a record |
160 | -- component. Concatenate name of variable with that of selector. The flag | |
161 | -- Dyn indicates whether this is called for the initialization procedure of | |
162 | -- record with task components, or for a dynamically created task that is | |
163 | -- assigned to a selected component. | |
70482933 | 164 | |
08cd7c2f AC |
165 | procedure Evaluate_Slice_Bounds (Slice : Node_Id); |
166 | -- Force evaluation of bounds of a slice, which may be given by a range | |
167 | -- or by a subtype indication with or without a constraint. | |
168 | ||
b3801819 PMR |
169 | function Is_Verifiable_DIC_Pragma (Prag : Node_Id) return Boolean; |
170 | -- Determine whether pragma Default_Initial_Condition denoted by Prag has | |
171 | -- an assertion expression that should be verified at run time. | |
172 | ||
a46fa651 ES |
173 | function Is_Uninitialized_Aggregate |
174 | (Exp : Node_Id; | |
175 | T : Entity_Id) return Boolean; | |
176 | -- Determine whether an array aggregate used in an object declaration | |
177 | -- is uninitialized, when the aggregate is declared with a box and | |
178 | -- the component type has no default value. Such an aggregate can be | |
179 | -- optimized away to prevent the copying of uninitialized data, and | |
180 | -- the bounds of the aggregate can be propagated directly to the | |
181 | -- object declaration. | |
182 | ||
70482933 | 183 | function Make_CW_Equivalent_Type |
bebbff91 AC |
184 | (T : Entity_Id; |
185 | E : Node_Id) return Entity_Id; | |
70482933 | 186 | -- T is a class-wide type entity, E is the initial expression node that |
273adcdf AC |
187 | -- constrains T in case such as: " X: T := E" or "new T'(E)". This function |
188 | -- returns the entity of the Equivalent type and inserts on the fly the | |
189 | -- necessary declaration such as: | |
fbf5a39b | 190 | -- |
70482933 RK |
191 | -- type anon is record |
192 | -- _parent : Root_Type (T); constrained with E discriminants (if any) | |
193 | -- Extension : String (1 .. expr to match size of E); | |
194 | -- end record; | |
195 | -- | |
273adcdf AC |
196 | -- This record is compatible with any object of the class of T thanks to |
197 | -- the first field and has the same size as E thanks to the second. | |
70482933 RK |
198 | |
199 | function Make_Literal_Range | |
200 | (Loc : Source_Ptr; | |
bebbff91 | 201 | Literal_Typ : Entity_Id) return Node_Id; |
70482933 | 202 | -- Produce a Range node whose bounds are: |
f91b40db | 203 | -- Low_Bound (Literal_Type) .. |
86cde7b1 | 204 | -- Low_Bound (Literal_Type) + (Length (Literal_Typ) - 1) |
70482933 | 205 | -- this is used for expanding declarations like X : String := "sdfgdfg"; |
86cde7b1 RD |
206 | -- |
207 | -- If the index type of the target array is not integer, we generate: | |
208 | -- Low_Bound (Literal_Type) .. | |
209 | -- Literal_Type'Val | |
210 | -- (Literal_Type'Pos (Low_Bound (Literal_Type)) | |
211 | -- + (Length (Literal_Typ) -1)) | |
70482933 | 212 | |
b3b9865d AC |
213 | function Make_Non_Empty_Check |
214 | (Loc : Source_Ptr; | |
215 | N : Node_Id) return Node_Id; | |
216 | -- Produce a boolean expression checking that the unidimensional array | |
217 | -- node N is not empty. | |
218 | ||
70482933 RK |
219 | function New_Class_Wide_Subtype |
220 | (CW_Typ : Entity_Id; | |
bebbff91 AC |
221 | N : Node_Id) return Entity_Id; |
222 | -- Create an implicit subtype of CW_Typ attached to node N | |
70482933 | 223 | |
87729e5a | 224 | function Requires_Cleanup_Actions |
2ba7e31e | 225 | (L : List_Id; |
fcf848c4 | 226 | Lib_Level : Boolean; |
2ba7e31e | 227 | Nested_Constructs : Boolean) return Boolean; |
87729e5a AC |
228 | -- Given a list L, determine whether it contains one of the following: |
229 | -- | |
230 | -- 1) controlled objects | |
231 | -- 2) library-level tagged types | |
232 | -- | |
5f44f0d4 AC |
233 | -- Lib_Level is True when the list comes from a construct at the library |
234 | -- level, and False otherwise. Nested_Constructs is True when any nested | |
235 | -- packages declared in L must be processed, and False otherwise. | |
87729e5a | 236 | |
cf9e3829 EB |
237 | function Side_Effect_Free_Attribute (Name : Name_Id) return Boolean; |
238 | -- Return True if the evaluation of the given attribute is considered | |
239 | -- side-effect free, independently of its prefix and expressions. | |
240 | ||
4c318253 AC |
241 | ------------------------------------- |
242 | -- Activate_Atomic_Synchronization -- | |
243 | ------------------------------------- | |
244 | ||
245 | procedure Activate_Atomic_Synchronization (N : Node_Id) is | |
246 | Msg_Node : Node_Id; | |
247 | ||
248 | begin | |
73fe1679 | 249 | case Nkind (Parent (N)) is |
73fe1679 | 250 | |
d8f43ee6 HK |
251 | -- Check for cases of appearing in the prefix of a construct where we |
252 | -- don't need atomic synchronization for this kind of usage. | |
6ec084f3 HK |
253 | |
254 | when | |
d8f43ee6 HK |
255 | -- Nothing to do if we are the prefix of an attribute, since we |
256 | -- do not want an atomic sync operation for things like 'Size. | |
6ec084f3 | 257 | |
d8f43ee6 | 258 | N_Attribute_Reference |
6ec084f3 | 259 | |
d8f43ee6 | 260 | -- The N_Reference node is like an attribute |
73fe1679 | 261 | |
d8f43ee6 | 262 | | N_Reference |
73fe1679 | 263 | |
d8f43ee6 HK |
264 | -- Nothing to do for a reference to a component (or components) |
265 | -- of a composite object. Only reads and updates of the object | |
266 | -- as a whole require atomic synchronization (RM C.6 (15)). | |
73fe1679 | 267 | |
d8f43ee6 HK |
268 | | N_Indexed_Component |
269 | | N_Selected_Component | |
270 | | N_Slice | |
271 | => | |
6ec084f3 | 272 | -- For all the above cases, nothing to do if we are the prefix |
73fe1679 AC |
273 | |
274 | if Prefix (Parent (N)) = N then | |
275 | return; | |
276 | end if; | |
277 | ||
d8f43ee6 HK |
278 | when others => |
279 | null; | |
73fe1679 | 280 | end case; |
4c318253 | 281 | |
6333ad3d | 282 | -- Nothing to do for the identifier in an object renaming declaration, |
47b79f78 | 283 | -- the renaming itself does not need atomic synchronization. |
6333ad3d AC |
284 | |
285 | if Nkind (Parent (N)) = N_Object_Renaming_Declaration then | |
286 | return; | |
287 | end if; | |
288 | ||
4c318253 AC |
289 | -- Go ahead and set the flag |
290 | ||
291 | Set_Atomic_Sync_Required (N); | |
292 | ||
293 | -- Generate info message if requested | |
294 | ||
295 | if Warn_On_Atomic_Synchronization then | |
296 | case Nkind (N) is | |
297 | when N_Identifier => | |
298 | Msg_Node := N; | |
299 | ||
d8f43ee6 HK |
300 | when N_Expanded_Name |
301 | | N_Selected_Component | |
302 | => | |
4c318253 AC |
303 | Msg_Node := Selector_Name (N); |
304 | ||
d8f43ee6 HK |
305 | when N_Explicit_Dereference |
306 | | N_Indexed_Component | |
307 | => | |
4c318253 AC |
308 | Msg_Node := Empty; |
309 | ||
310 | when others => | |
311 | pragma Assert (False); | |
312 | return; | |
313 | end case; | |
314 | ||
315 | if Present (Msg_Node) then | |
324ac540 | 316 | Error_Msg_N |
2e57f88b | 317 | ("info: atomic synchronization set for &?N?", Msg_Node); |
4c318253 | 318 | else |
324ac540 | 319 | Error_Msg_N |
2e57f88b | 320 | ("info: atomic synchronization set?N?", N); |
4c318253 AC |
321 | end if; |
322 | end if; | |
323 | end Activate_Atomic_Synchronization; | |
324 | ||
70482933 RK |
325 | ---------------------- |
326 | -- Adjust_Condition -- | |
327 | ---------------------- | |
328 | ||
329 | procedure Adjust_Condition (N : Node_Id) is | |
330 | begin | |
331 | if No (N) then | |
332 | return; | |
333 | end if; | |
334 | ||
335 | declare | |
336 | Loc : constant Source_Ptr := Sloc (N); | |
337 | T : constant Entity_Id := Etype (N); | |
70482933 RK |
338 | |
339 | begin | |
a2773bd3 AC |
340 | -- Defend against a call where the argument has no type, or has a |
341 | -- type that is not Boolean. This can occur because of prior errors. | |
70482933 RK |
342 | |
343 | if No (T) or else not Is_Boolean_Type (T) then | |
344 | return; | |
345 | end if; | |
346 | ||
347 | -- Apply validity checking if needed | |
348 | ||
349 | if Validity_Checks_On and Validity_Check_Tests then | |
350 | Ensure_Valid (N); | |
351 | end if; | |
352 | ||
353 | -- Immediate return if standard boolean, the most common case, | |
354 | -- where nothing needs to be done. | |
355 | ||
356 | if Base_Type (T) = Standard_Boolean then | |
357 | return; | |
358 | end if; | |
359 | ||
3f833dc2 | 360 | -- Case of zero/nonzero semantics or nonstandard enumeration |
70482933 RK |
361 | -- representation. In each case, we rewrite the node as: |
362 | ||
363 | -- ityp!(N) /= False'Enum_Rep | |
364 | ||
273adcdf AC |
365 | -- where ityp is an integer type with large enough size to hold any |
366 | -- value of type T. | |
70482933 RK |
367 | |
368 | if Nonzero_Is_True (T) or else Has_Non_Standard_Rep (T) then | |
70482933 RK |
369 | Rewrite (N, |
370 | Make_Op_Ne (Loc, | |
c7c7dd3a EB |
371 | Left_Opnd => |
372 | Unchecked_Convert_To | |
373 | (Integer_Type_For (Esize (T), Uns => False), N), | |
70482933 RK |
374 | Right_Opnd => |
375 | Make_Attribute_Reference (Loc, | |
376 | Attribute_Name => Name_Enum_Rep, | |
377 | Prefix => | |
378 | New_Occurrence_Of (First_Literal (T), Loc)))); | |
379 | Analyze_And_Resolve (N, Standard_Boolean); | |
380 | ||
381 | else | |
382 | Rewrite (N, Convert_To (Standard_Boolean, N)); | |
383 | Analyze_And_Resolve (N, Standard_Boolean); | |
384 | end if; | |
385 | end; | |
386 | end Adjust_Condition; | |
387 | ||
388 | ------------------------ | |
389 | -- Adjust_Result_Type -- | |
390 | ------------------------ | |
391 | ||
392 | procedure Adjust_Result_Type (N : Node_Id; T : Entity_Id) is | |
393 | begin | |
394 | -- Ignore call if current type is not Standard.Boolean | |
395 | ||
396 | if Etype (N) /= Standard_Boolean then | |
397 | return; | |
398 | end if; | |
399 | ||
400 | -- If result is already of correct type, nothing to do. Note that | |
401 | -- this will get the most common case where everything has a type | |
402 | -- of Standard.Boolean. | |
403 | ||
404 | if Base_Type (T) = Standard_Boolean then | |
405 | return; | |
406 | ||
407 | else | |
408 | declare | |
409 | KP : constant Node_Kind := Nkind (Parent (N)); | |
410 | ||
411 | begin | |
412 | -- If result is to be used as a Condition in the syntax, no need | |
413 | -- to convert it back, since if it was changed to Standard.Boolean | |
414 | -- using Adjust_Condition, that is just fine for this usage. | |
415 | ||
416 | if KP in N_Raise_xxx_Error or else KP in N_Has_Condition then | |
417 | return; | |
418 | ||
419 | -- If result is an operand of another logical operation, no need | |
420 | -- to reset its type, since Standard.Boolean is just fine, and | |
421 | -- such operations always do Adjust_Condition on their operands. | |
422 | ||
ac7120ce RD |
423 | elsif KP in N_Op_Boolean |
424 | or else KP in N_Short_Circuit | |
70482933 RK |
425 | or else KP = N_Op_Not |
426 | then | |
427 | return; | |
428 | ||
273adcdf | 429 | -- Otherwise we perform a conversion from the current type, which |
f24ea912 AC |
430 | -- must be Standard.Boolean, to the desired type. Use the base |
431 | -- type to prevent spurious constraint checks that are extraneous | |
432 | -- to the transformation. The type and its base have the same | |
433 | -- representation, standard or otherwise. | |
70482933 RK |
434 | |
435 | else | |
436 | Set_Analyzed (N); | |
f24ea912 AC |
437 | Rewrite (N, Convert_To (Base_Type (T), N)); |
438 | Analyze_And_Resolve (N, Base_Type (T)); | |
70482933 RK |
439 | end if; |
440 | end; | |
441 | end if; | |
442 | end Adjust_Result_Type; | |
443 | ||
444 | -------------------------- | |
445 | -- Append_Freeze_Action -- | |
446 | -------------------------- | |
447 | ||
448 | procedure Append_Freeze_Action (T : Entity_Id; N : Node_Id) is | |
05350ac6 | 449 | Fnode : Node_Id; |
70482933 RK |
450 | |
451 | begin | |
452 | Ensure_Freeze_Node (T); | |
453 | Fnode := Freeze_Node (T); | |
454 | ||
59e54267 | 455 | if No (Actions (Fnode)) then |
3a3af4c3 AC |
456 | Set_Actions (Fnode, New_List (N)); |
457 | else | |
458 | Append (N, Actions (Fnode)); | |
70482933 RK |
459 | end if; |
460 | ||
70482933 RK |
461 | end Append_Freeze_Action; |
462 | ||
463 | --------------------------- | |
464 | -- Append_Freeze_Actions -- | |
465 | --------------------------- | |
466 | ||
467 | procedure Append_Freeze_Actions (T : Entity_Id; L : List_Id) is | |
3a3af4c3 | 468 | Fnode : Node_Id; |
70482933 RK |
469 | |
470 | begin | |
471 | if No (L) then | |
472 | return; | |
3a3af4c3 AC |
473 | end if; |
474 | ||
475 | Ensure_Freeze_Node (T); | |
476 | Fnode := Freeze_Node (T); | |
70482933 | 477 | |
3a3af4c3 AC |
478 | if No (Actions (Fnode)) then |
479 | Set_Actions (Fnode, L); | |
70482933 | 480 | else |
3a3af4c3 | 481 | Append_List (L, Actions (Fnode)); |
70482933 RK |
482 | end if; |
483 | end Append_Freeze_Actions; | |
484 | ||
6b0c5c72 PT |
485 | ---------------------------------------- |
486 | -- Attribute_Constrained_Static_Value -- | |
487 | ---------------------------------------- | |
d2880e69 CD |
488 | |
489 | function Attribute_Constrained_Static_Value (Pref : Node_Id) return Boolean | |
490 | is | |
491 | Ptyp : constant Entity_Id := Etype (Pref); | |
492 | Formal_Ent : constant Entity_Id := Param_Entity (Pref); | |
493 | ||
494 | function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean; | |
495 | -- Ada 2005 (AI-363): Returns True if the object name Obj denotes a | |
496 | -- view of an aliased object whose subtype is constrained. | |
497 | ||
498 | --------------------------------- | |
499 | -- Is_Constrained_Aliased_View -- | |
500 | --------------------------------- | |
501 | ||
502 | function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean is | |
503 | E : Entity_Id; | |
504 | ||
505 | begin | |
506 | if Is_Entity_Name (Obj) then | |
507 | E := Entity (Obj); | |
508 | ||
509 | if Present (Renamed_Object (E)) then | |
510 | return Is_Constrained_Aliased_View (Renamed_Object (E)); | |
511 | else | |
512 | return Is_Aliased (E) and then Is_Constrained (Etype (E)); | |
513 | end if; | |
514 | ||
515 | else | |
516 | return Is_Aliased_View (Obj) | |
517 | and then | |
518 | (Is_Constrained (Etype (Obj)) | |
519 | or else | |
520 | (Nkind (Obj) = N_Explicit_Dereference | |
521 | and then | |
522 | not Object_Type_Has_Constrained_Partial_View | |
523 | (Typ => Base_Type (Etype (Obj)), | |
524 | Scop => Current_Scope))); | |
525 | end if; | |
526 | end Is_Constrained_Aliased_View; | |
527 | ||
528 | -- Start of processing for Attribute_Constrained_Static_Value | |
529 | ||
530 | begin | |
531 | -- We are in a case where the attribute is known statically, and | |
532 | -- implicit dereferences have been rewritten. | |
533 | ||
534 | pragma Assert | |
535 | (not (Present (Formal_Ent) | |
536 | and then Ekind (Formal_Ent) /= E_Constant | |
537 | and then Present (Extra_Constrained (Formal_Ent))) | |
538 | and then | |
539 | not (Is_Access_Type (Etype (Pref)) | |
540 | and then (not Is_Entity_Name (Pref) | |
541 | or else Is_Object (Entity (Pref)))) | |
542 | and then | |
543 | not (Nkind (Pref) = N_Identifier | |
544 | and then Ekind (Entity (Pref)) = E_Variable | |
545 | and then Present (Extra_Constrained (Entity (Pref))))); | |
546 | ||
547 | if Is_Entity_Name (Pref) then | |
548 | declare | |
6b0c5c72 | 549 | Ent : constant Entity_Id := Entity (Pref); |
d2880e69 CD |
550 | Res : Boolean; |
551 | ||
552 | begin | |
553 | -- (RM J.4) obsolescent cases | |
554 | ||
555 | if Is_Type (Ent) then | |
556 | ||
557 | -- Private type | |
558 | ||
559 | if Is_Private_Type (Ent) then | |
560 | Res := not Has_Discriminants (Ent) | |
561 | or else Is_Constrained (Ent); | |
562 | ||
563 | -- It not a private type, must be a generic actual type | |
564 | -- that corresponded to a private type. We know that this | |
565 | -- correspondence holds, since otherwise the reference | |
566 | -- within the generic template would have been illegal. | |
567 | ||
568 | else | |
569 | if Is_Composite_Type (Underlying_Type (Ent)) then | |
570 | Res := Is_Constrained (Ent); | |
571 | else | |
572 | Res := True; | |
573 | end if; | |
574 | end if; | |
575 | ||
576 | else | |
577 | ||
578 | -- If the prefix is not a variable or is aliased, then | |
579 | -- definitely true; if it's a formal parameter without an | |
580 | -- associated extra formal, then treat it as constrained. | |
581 | ||
582 | -- Ada 2005 (AI-363): An aliased prefix must be known to be | |
583 | -- constrained in order to set the attribute to True. | |
584 | ||
585 | if not Is_Variable (Pref) | |
586 | or else Present (Formal_Ent) | |
587 | or else (Ada_Version < Ada_2005 | |
588 | and then Is_Aliased_View (Pref)) | |
589 | or else (Ada_Version >= Ada_2005 | |
590 | and then Is_Constrained_Aliased_View (Pref)) | |
591 | then | |
592 | Res := True; | |
593 | ||
594 | -- Variable case, look at type to see if it is constrained. | |
595 | -- Note that the one case where this is not accurate (the | |
596 | -- procedure formal case), has been handled above. | |
597 | ||
598 | -- We use the Underlying_Type here (and below) in case the | |
599 | -- type is private without discriminants, but the full type | |
600 | -- has discriminants. This case is illegal, but we generate | |
601 | -- it internally for passing to the Extra_Constrained | |
602 | -- parameter. | |
603 | ||
604 | else | |
605 | -- In Ada 2012, test for case of a limited tagged type, | |
606 | -- in which case the attribute is always required to | |
607 | -- return True. The underlying type is tested, to make | |
608 | -- sure we also return True for cases where there is an | |
609 | -- unconstrained object with an untagged limited partial | |
610 | -- view which has defaulted discriminants (such objects | |
611 | -- always produce a False in earlier versions of | |
612 | -- Ada). (Ada 2012: AI05-0214) | |
613 | ||
614 | Res := | |
615 | Is_Constrained (Underlying_Type (Etype (Ent))) | |
616 | or else | |
617 | (Ada_Version >= Ada_2012 | |
618 | and then Is_Tagged_Type (Underlying_Type (Ptyp)) | |
619 | and then Is_Limited_Type (Ptyp)); | |
620 | end if; | |
621 | end if; | |
622 | ||
623 | return Res; | |
624 | end; | |
625 | ||
626 | -- Prefix is not an entity name. These are also cases where we can | |
627 | -- always tell at compile time by looking at the form and type of the | |
628 | -- prefix. If an explicit dereference of an object with constrained | |
629 | -- partial view, this is unconstrained (Ada 2005: AI95-0363). If the | |
630 | -- underlying type is a limited tagged type, then Constrained is | |
631 | -- required to always return True (Ada 2012: AI05-0214). | |
632 | ||
633 | else | |
634 | return not Is_Variable (Pref) | |
635 | or else | |
636 | (Nkind (Pref) = N_Explicit_Dereference | |
637 | and then | |
638 | not Object_Type_Has_Constrained_Partial_View | |
639 | (Typ => Base_Type (Ptyp), | |
640 | Scop => Current_Scope)) | |
641 | or else Is_Constrained (Underlying_Type (Ptyp)) | |
642 | or else (Ada_Version >= Ada_2012 | |
643 | and then Is_Tagged_Type (Underlying_Type (Ptyp)) | |
644 | and then Is_Limited_Type (Ptyp)); | |
645 | end if; | |
646 | end Attribute_Constrained_Static_Value; | |
647 | ||
df3e68b1 HK |
648 | ------------------------------------ |
649 | -- Build_Allocate_Deallocate_Proc -- | |
650 | ------------------------------------ | |
651 | ||
652 | procedure Build_Allocate_Deallocate_Proc | |
653 | (N : Node_Id; | |
654 | Is_Allocate : Boolean) | |
655 | is | |
df3e68b1 HK |
656 | function Find_Object (E : Node_Id) return Node_Id; |
657 | -- Given an arbitrary expression of an allocator, try to find an object | |
658 | -- reference in it, otherwise return the original expression. | |
659 | ||
660 | function Is_Allocate_Deallocate_Proc (Subp : Entity_Id) return Boolean; | |
661 | -- Determine whether subprogram Subp denotes a custom allocate or | |
662 | -- deallocate. | |
663 | ||
664 | ----------------- | |
665 | -- Find_Object -- | |
666 | ----------------- | |
667 | ||
668 | function Find_Object (E : Node_Id) return Node_Id is | |
2c1b72d7 | 669 | Expr : Node_Id; |
df3e68b1 HK |
670 | |
671 | begin | |
672 | pragma Assert (Is_Allocate); | |
673 | ||
2c1b72d7 AC |
674 | Expr := E; |
675 | loop | |
31d922e3 AC |
676 | if Nkind (Expr) = N_Explicit_Dereference then |
677 | Expr := Prefix (Expr); | |
678 | ||
679 | elsif Nkind (Expr) = N_Qualified_Expression then | |
2c1b72d7 | 680 | Expr := Expression (Expr); |
df3e68b1 | 681 | |
31d922e3 AC |
682 | elsif Nkind (Expr) = N_Unchecked_Type_Conversion then |
683 | ||
684 | -- When interface class-wide types are involved in allocation, | |
685 | -- the expander introduces several levels of address arithmetic | |
686 | -- to perform dispatch table displacement. In this scenario the | |
687 | -- object appears as: | |
f3920a13 | 688 | |
31d922e3 | 689 | -- Tag_Ptr (Base_Address (<object>'Address)) |
f3920a13 | 690 | |
31d922e3 AC |
691 | -- Detect this case and utilize the whole expression as the |
692 | -- "object" since it now points to the proper dispatch table. | |
693 | ||
694 | if Is_RTE (Etype (Expr), RE_Tag_Ptr) then | |
695 | exit; | |
696 | ||
697 | -- Continue to strip the object | |
698 | ||
699 | else | |
700 | Expr := Expression (Expr); | |
701 | end if; | |
2c1b72d7 AC |
702 | |
703 | else | |
704 | exit; | |
df3e68b1 HK |
705 | end if; |
706 | end loop; | |
707 | ||
708 | return Expr; | |
709 | end Find_Object; | |
710 | ||
711 | --------------------------------- | |
712 | -- Is_Allocate_Deallocate_Proc -- | |
713 | --------------------------------- | |
714 | ||
715 | function Is_Allocate_Deallocate_Proc (Subp : Entity_Id) return Boolean is | |
716 | begin | |
717 | -- Look for a subprogram body with only one statement which is a | |
d3f70b35 | 718 | -- call to Allocate_Any_Controlled / Deallocate_Any_Controlled. |
df3e68b1 HK |
719 | |
720 | if Ekind (Subp) = E_Procedure | |
721 | and then Nkind (Parent (Parent (Subp))) = N_Subprogram_Body | |
722 | then | |
723 | declare | |
724 | HSS : constant Node_Id := | |
725 | Handled_Statement_Sequence (Parent (Parent (Subp))); | |
726 | Proc : Entity_Id; | |
727 | ||
728 | begin | |
729 | if Present (Statements (HSS)) | |
730 | and then Nkind (First (Statements (HSS))) = | |
731 | N_Procedure_Call_Statement | |
732 | then | |
733 | Proc := Entity (Name (First (Statements (HSS)))); | |
734 | ||
735 | return | |
d3f70b35 AC |
736 | Is_RTE (Proc, RE_Allocate_Any_Controlled) |
737 | or else Is_RTE (Proc, RE_Deallocate_Any_Controlled); | |
df3e68b1 HK |
738 | end if; |
739 | end; | |
740 | end if; | |
741 | ||
742 | return False; | |
743 | end Is_Allocate_Deallocate_Proc; | |
744 | ||
d1eb8a82 AC |
745 | -- Local variables |
746 | ||
4c5e9870 SB |
747 | Desig_Typ : Entity_Id; |
748 | Expr : Node_Id; | |
749 | Needs_Fin : Boolean; | |
750 | Pool_Id : Entity_Id; | |
751 | Proc_To_Call : Node_Id := Empty; | |
752 | Ptr_Typ : Entity_Id; | |
753 | Use_Secondary_Stack_Pool : Boolean; | |
d1eb8a82 | 754 | |
df3e68b1 HK |
755 | -- Start of processing for Build_Allocate_Deallocate_Proc |
756 | ||
757 | begin | |
ca5af305 AC |
758 | -- Obtain the attributes of the allocation / deallocation |
759 | ||
760 | if Nkind (N) = N_Free_Statement then | |
761 | Expr := Expression (N); | |
762 | Ptr_Typ := Base_Type (Etype (Expr)); | |
763 | Proc_To_Call := Procedure_To_Call (N); | |
764 | ||
765 | else | |
766 | if Nkind (N) = N_Object_Declaration then | |
767 | Expr := Expression (N); | |
768 | else | |
769 | Expr := N; | |
770 | end if; | |
771 | ||
f7bb41af AC |
772 | -- In certain cases an allocator with a qualified expression may |
773 | -- be relocated and used as the initialization expression of a | |
774 | -- temporary: | |
775 | ||
776 | -- before: | |
777 | -- Obj : Ptr_Typ := new Desig_Typ'(...); | |
778 | ||
779 | -- after: | |
780 | -- Tmp : Ptr_Typ := new Desig_Typ'(...); | |
781 | -- Obj : Ptr_Typ := Tmp; | |
782 | ||
783 | -- Since the allocator is always marked as analyzed to avoid infinite | |
784 | -- expansion, it will never be processed by this routine given that | |
785 | -- the designated type needs finalization actions. Detect this case | |
786 | -- and complete the expansion of the allocator. | |
787 | ||
788 | if Nkind (Expr) = N_Identifier | |
789 | and then Nkind (Parent (Entity (Expr))) = N_Object_Declaration | |
790 | and then Nkind (Expression (Parent (Entity (Expr)))) = N_Allocator | |
791 | then | |
792 | Build_Allocate_Deallocate_Proc (Parent (Entity (Expr)), True); | |
793 | return; | |
794 | end if; | |
ca5af305 | 795 | |
f7bb41af AC |
796 | -- The allocator may have been rewritten into something else in which |
797 | -- case the expansion performed by this routine does not apply. | |
ca5af305 | 798 | |
f7bb41af AC |
799 | if Nkind (Expr) /= N_Allocator then |
800 | return; | |
ca5af305 | 801 | end if; |
f7bb41af AC |
802 | |
803 | Ptr_Typ := Base_Type (Etype (Expr)); | |
804 | Proc_To_Call := Procedure_To_Call (Expr); | |
ca5af305 AC |
805 | end if; |
806 | ||
807 | Pool_Id := Associated_Storage_Pool (Ptr_Typ); | |
808 | Desig_Typ := Available_View (Designated_Type (Ptr_Typ)); | |
df3e68b1 | 809 | |
ca5af305 AC |
810 | -- Handle concurrent types |
811 | ||
812 | if Is_Concurrent_Type (Desig_Typ) | |
813 | and then Present (Corresponding_Record_Type (Desig_Typ)) | |
814 | then | |
815 | Desig_Typ := Corresponding_Record_Type (Desig_Typ); | |
816 | end if; | |
817 | ||
4c5e9870 SB |
818 | Use_Secondary_Stack_Pool := |
819 | Is_RTE (Pool_Id, RE_SS_Pool) | |
820 | or else (Nkind (Expr) = N_Allocator | |
821 | and then Is_RTE (Storage_Pool (Expr), RE_SS_Pool)); | |
822 | ||
ca5af305 AC |
823 | -- Do not process allocations / deallocations without a pool |
824 | ||
825 | if No (Pool_Id) then | |
df3e68b1 HK |
826 | return; |
827 | ||
ca5af305 | 828 | -- Do not process allocations on / deallocations from the secondary |
4c5e9870 | 829 | -- stack, except for access types used to implement indirect temps. |
ca5af305 | 830 | |
4c5e9870 SB |
831 | elsif Use_Secondary_Stack_Pool |
832 | and then not Old_Attr_Util.Indirect_Temps | |
833 | .Is_Access_Type_For_Indirect_Temp (Ptr_Typ) | |
d4dfb005 | 834 | then |
ca5af305 AC |
835 | return; |
836 | ||
fc3819c9 AC |
837 | -- Optimize the case where we are using the default Global_Pool_Object, |
838 | -- and we don't need the heavy finalization machinery. | |
839 | ||
3477e0b2 | 840 | elsif Is_RTE (Pool_Id, RE_Global_Pool_Object) |
fc3819c9 AC |
841 | and then not Needs_Finalization (Desig_Typ) |
842 | then | |
843 | return; | |
844 | ||
ca5af305 AC |
845 | -- Do not replicate the machinery if the allocator / free has already |
846 | -- been expanded and has a custom Allocate / Deallocate. | |
847 | ||
848 | elsif Present (Proc_To_Call) | |
849 | and then Is_Allocate_Deallocate_Proc (Proc_To_Call) | |
850 | then | |
851 | return; | |
852 | end if; | |
853 | ||
d1eb8a82 AC |
854 | -- Finalization actions are required when the object to be allocated or |
855 | -- deallocated needs these actions and the associated access type is not | |
856 | -- subject to pragma No_Heap_Finalization. | |
857 | ||
858 | Needs_Fin := | |
859 | Needs_Finalization (Desig_Typ) | |
860 | and then not No_Heap_Finalization (Ptr_Typ); | |
861 | ||
862 | if Needs_Fin then | |
ca5af305 | 863 | |
ca5af305 AC |
864 | -- Do nothing if the access type may never allocate / deallocate |
865 | -- objects. | |
866 | ||
7d1d3a54 | 867 | if No_Pool_Assigned (Ptr_Typ) then |
ca5af305 | 868 | return; |
ca5af305 AC |
869 | end if; |
870 | ||
871 | -- The allocation / deallocation of a controlled object must be | |
872 | -- chained on / detached from a finalization master. | |
873 | ||
874 | pragma Assert (Present (Finalization_Master (Ptr_Typ))); | |
875 | ||
876 | -- The only other kind of allocation / deallocation supported by this | |
877 | -- routine is on / from a subpool. | |
df3e68b1 HK |
878 | |
879 | elsif Nkind (Expr) = N_Allocator | |
ca5af305 | 880 | and then No (Subpool_Handle_Name (Expr)) |
df3e68b1 HK |
881 | then |
882 | return; | |
883 | end if; | |
884 | ||
885 | declare | |
886 | Loc : constant Source_Ptr := Sloc (N); | |
887 | Addr_Id : constant Entity_Id := Make_Temporary (Loc, 'A'); | |
888 | Alig_Id : constant Entity_Id := Make_Temporary (Loc, 'L'); | |
889 | Proc_Id : constant Entity_Id := Make_Temporary (Loc, 'P'); | |
890 | Size_Id : constant Entity_Id := Make_Temporary (Loc, 'S'); | |
891 | ||
892 | Actuals : List_Id; | |
d3f70b35 AC |
893 | Fin_Addr_Id : Entity_Id; |
894 | Fin_Mas_Act : Node_Id; | |
895 | Fin_Mas_Id : Entity_Id; | |
df3e68b1 | 896 | Proc_To_Call : Entity_Id; |
ca5af305 | 897 | Subpool : Node_Id := Empty; |
df3e68b1 HK |
898 | |
899 | begin | |
d3f70b35 AC |
900 | -- Step 1: Construct all the actuals for the call to library routine |
901 | -- Allocate_Any_Controlled / Deallocate_Any_Controlled. | |
df3e68b1 | 902 | |
d3f70b35 | 903 | -- a) Storage pool |
df3e68b1 | 904 | |
e4494292 | 905 | Actuals := New_List (New_Occurrence_Of (Pool_Id, Loc)); |
df3e68b1 | 906 | |
d3f70b35 | 907 | if Is_Allocate then |
df3e68b1 | 908 | |
d3f70b35 | 909 | -- b) Subpool |
df3e68b1 | 910 | |
ca5af305 AC |
911 | if Nkind (Expr) = N_Allocator then |
912 | Subpool := Subpool_Handle_Name (Expr); | |
913 | end if; | |
914 | ||
4bb43ffb AC |
915 | -- If a subpool is present it can be an arbitrary name, so make |
916 | -- the actual by copying the tree. | |
917 | ||
ca5af305 | 918 | if Present (Subpool) then |
4bb43ffb | 919 | Append_To (Actuals, New_Copy_Tree (Subpool, New_Sloc => Loc)); |
d3f70b35 AC |
920 | else |
921 | Append_To (Actuals, Make_Null (Loc)); | |
922 | end if; | |
df3e68b1 | 923 | |
d3f70b35 AC |
924 | -- c) Finalization master |
925 | ||
d1eb8a82 | 926 | if Needs_Fin then |
ca5af305 | 927 | Fin_Mas_Id := Finalization_Master (Ptr_Typ); |
e4494292 | 928 | Fin_Mas_Act := New_Occurrence_Of (Fin_Mas_Id, Loc); |
d3f70b35 AC |
929 | |
930 | -- Handle the case where the master is actually a pointer to a | |
931 | -- master. This case arises in build-in-place functions. | |
932 | ||
933 | if Is_Access_Type (Etype (Fin_Mas_Id)) then | |
934 | Append_To (Actuals, Fin_Mas_Act); | |
df3e68b1 | 935 | else |
d3f70b35 AC |
936 | Append_To (Actuals, |
937 | Make_Attribute_Reference (Loc, | |
938 | Prefix => Fin_Mas_Act, | |
939 | Attribute_Name => Name_Unrestricted_Access)); | |
df3e68b1 | 940 | end if; |
d3f70b35 AC |
941 | else |
942 | Append_To (Actuals, Make_Null (Loc)); | |
943 | end if; | |
df3e68b1 | 944 | |
d3f70b35 | 945 | -- d) Finalize_Address |
df3e68b1 | 946 | |
60370fb1 AC |
947 | -- Primitive Finalize_Address is never generated in CodePeer mode |
948 | -- since it contains an Unchecked_Conversion. | |
df3e68b1 | 949 | |
d1eb8a82 | 950 | if Needs_Fin and then not CodePeer_Mode then |
760804f3 | 951 | Fin_Addr_Id := Finalize_Address (Desig_Typ); |
ca5af305 AC |
952 | pragma Assert (Present (Fin_Addr_Id)); |
953 | ||
d3f70b35 AC |
954 | Append_To (Actuals, |
955 | Make_Attribute_Reference (Loc, | |
e4494292 | 956 | Prefix => New_Occurrence_Of (Fin_Addr_Id, Loc), |
d3f70b35 AC |
957 | Attribute_Name => Name_Unrestricted_Access)); |
958 | else | |
959 | Append_To (Actuals, Make_Null (Loc)); | |
960 | end if; | |
961 | end if; | |
df3e68b1 | 962 | |
d3f70b35 AC |
963 | -- e) Address |
964 | -- f) Storage_Size | |
965 | -- g) Alignment | |
df3e68b1 | 966 | |
e4494292 RD |
967 | Append_To (Actuals, New_Occurrence_Of (Addr_Id, Loc)); |
968 | Append_To (Actuals, New_Occurrence_Of (Size_Id, Loc)); | |
6bed26b5 | 969 | |
4c5e9870 SB |
970 | if (Is_Allocate or else not Is_Class_Wide_Type (Desig_Typ)) |
971 | and then not Use_Secondary_Stack_Pool | |
972 | then | |
e4494292 | 973 | Append_To (Actuals, New_Occurrence_Of (Alig_Id, Loc)); |
6bed26b5 | 974 | |
f3296dd3 | 975 | -- For deallocation of class-wide types we obtain the value of |
6bed26b5 AC |
976 | -- alignment from the Type Specific Record of the deallocated object. |
977 | -- This is needed because the frontend expansion of class-wide types | |
bb072d1c | 978 | -- into equivalent types confuses the back end. |
6bed26b5 AC |
979 | |
980 | else | |
981 | -- Generate: | |
982 | -- Obj.all'Alignment | |
983 | ||
984 | -- ... because 'Alignment applied to class-wide types is expanded | |
985 | -- into the code that reads the value of alignment from the TSD | |
986 | -- (see Expand_N_Attribute_Reference) | |
987 | ||
4c5e9870 SB |
988 | -- In the Use_Secondary_Stack_Pool case, Alig_Id is not |
989 | -- passed in and therefore must not be referenced. | |
990 | ||
6bed26b5 AC |
991 | Append_To (Actuals, |
992 | Unchecked_Convert_To (RTE (RE_Storage_Offset), | |
993 | Make_Attribute_Reference (Loc, | |
033eaf85 | 994 | Prefix => |
6bed26b5 AC |
995 | Make_Explicit_Dereference (Loc, Relocate_Node (Expr)), |
996 | Attribute_Name => Name_Alignment))); | |
997 | end if; | |
df3e68b1 | 998 | |
d3f70b35 | 999 | -- h) Is_Controlled |
df3e68b1 | 1000 | |
d1eb8a82 AC |
1001 | if Needs_Fin then |
1002 | Is_Controlled : declare | |
31d922e3 AC |
1003 | Flag_Id : constant Entity_Id := Make_Temporary (Loc, 'F'); |
1004 | Flag_Expr : Node_Id; | |
1005 | Param : Node_Id; | |
3e720c96 | 1006 | Pref : Node_Id; |
31d922e3 AC |
1007 | Temp : Node_Id; |
1008 | ||
1009 | begin | |
1010 | if Is_Allocate then | |
1011 | Temp := Find_Object (Expression (Expr)); | |
1012 | else | |
1013 | Temp := Expr; | |
1014 | end if; | |
df3e68b1 | 1015 | |
31d922e3 AC |
1016 | -- Processing for allocations where the expression is a subtype |
1017 | -- indication. | |
df3e68b1 | 1018 | |
31d922e3 AC |
1019 | if Is_Allocate |
1020 | and then Is_Entity_Name (Temp) | |
1021 | and then Is_Type (Entity (Temp)) | |
1022 | then | |
1023 | Flag_Expr := | |
e4494292 | 1024 | New_Occurrence_Of |
f3920a13 AC |
1025 | (Boolean_Literals |
1026 | (Needs_Finalization (Entity (Temp))), Loc); | |
df3e68b1 | 1027 | |
31d922e3 AC |
1028 | -- The allocation / deallocation of a class-wide object relies |
1029 | -- on a runtime check to determine whether the object is truly | |
1030 | -- controlled or not. Depending on this check, the finalization | |
1031 | -- machinery will request or reclaim extra storage reserved for | |
1032 | -- a list header. | |
df3e68b1 | 1033 | |
31d922e3 | 1034 | elsif Is_Class_Wide_Type (Desig_Typ) then |
df3e68b1 | 1035 | |
31d922e3 AC |
1036 | -- Detect a special case where interface class-wide types |
1037 | -- are involved as the object appears as: | |
f3920a13 | 1038 | |
31d922e3 | 1039 | -- Tag_Ptr (Base_Address (<object>'Address)) |
f3920a13 | 1040 | |
31d922e3 | 1041 | -- The expression already yields the proper tag, generate: |
f3920a13 | 1042 | |
31d922e3 AC |
1043 | -- Temp.all |
1044 | ||
1045 | if Is_RTE (Etype (Temp), RE_Tag_Ptr) then | |
1046 | Param := | |
1047 | Make_Explicit_Dereference (Loc, | |
1048 | Prefix => Relocate_Node (Temp)); | |
1049 | ||
1050 | -- In the default case, obtain the tag of the object about | |
1051 | -- to be allocated / deallocated. Generate: | |
f3920a13 | 1052 | |
31d922e3 | 1053 | -- Temp'Tag |
df3e68b1 | 1054 | |
f8159014 AC |
1055 | -- If the object is an unchecked conversion (typically to |
1056 | -- an access to class-wide type), we must preserve the | |
1057 | -- conversion to ensure that the object is seen as tagged | |
1058 | -- in the code that follows. | |
1059 | ||
d3f70b35 | 1060 | else |
3e720c96 HK |
1061 | Pref := Temp; |
1062 | ||
1063 | if Nkind (Parent (Pref)) = N_Unchecked_Type_Conversion | |
f8159014 | 1064 | then |
3e720c96 | 1065 | Pref := Parent (Pref); |
f8159014 | 1066 | end if; |
3e720c96 HK |
1067 | |
1068 | Param := | |
1069 | Make_Attribute_Reference (Loc, | |
1070 | Prefix => Relocate_Node (Pref), | |
1071 | Attribute_Name => Name_Tag); | |
d3f70b35 AC |
1072 | end if; |
1073 | ||
31d922e3 AC |
1074 | -- Generate: |
1075 | -- Needs_Finalization (<Param>) | |
d3f70b35 | 1076 | |
31d922e3 AC |
1077 | Flag_Expr := |
1078 | Make_Function_Call (Loc, | |
1079 | Name => | |
e4494292 | 1080 | New_Occurrence_Of (RTE (RE_Needs_Finalization), Loc), |
31d922e3 | 1081 | Parameter_Associations => New_List (Param)); |
d3f70b35 | 1082 | |
31d922e3 | 1083 | -- Processing for generic actuals |
d3f70b35 | 1084 | |
31d922e3 AC |
1085 | elsif Is_Generic_Actual_Type (Desig_Typ) then |
1086 | Flag_Expr := | |
e4494292 | 1087 | New_Occurrence_Of (Boolean_Literals |
31d922e3 | 1088 | (Needs_Finalization (Base_Type (Desig_Typ))), Loc); |
ca5af305 | 1089 | |
31d922e3 AC |
1090 | -- The object does not require any specialized checks, it is |
1091 | -- known to be controlled. | |
ca5af305 | 1092 | |
31d922e3 | 1093 | else |
e4494292 | 1094 | Flag_Expr := New_Occurrence_Of (Standard_True, Loc); |
31d922e3 AC |
1095 | end if; |
1096 | ||
1097 | -- Create the temporary which represents the finalization state | |
1098 | -- of the expression. Generate: | |
1099 | -- | |
1100 | -- F : constant Boolean := <Flag_Expr>; | |
1101 | ||
1102 | Insert_Action (N, | |
1103 | Make_Object_Declaration (Loc, | |
1104 | Defining_Identifier => Flag_Id, | |
1105 | Constant_Present => True, | |
1106 | Object_Definition => | |
e4494292 | 1107 | New_Occurrence_Of (Standard_Boolean, Loc), |
31d922e3 AC |
1108 | Expression => Flag_Expr)); |
1109 | ||
e4494292 | 1110 | Append_To (Actuals, New_Occurrence_Of (Flag_Id, Loc)); |
d1eb8a82 | 1111 | end Is_Controlled; |
31d922e3 AC |
1112 | |
1113 | -- The object is not controlled | |
033eaf85 | 1114 | |
d3f70b35 | 1115 | else |
e4494292 | 1116 | Append_To (Actuals, New_Occurrence_Of (Standard_False, Loc)); |
df3e68b1 HK |
1117 | end if; |
1118 | ||
ca5af305 AC |
1119 | -- i) On_Subpool |
1120 | ||
1121 | if Is_Allocate then | |
1122 | Append_To (Actuals, | |
e4494292 | 1123 | New_Occurrence_Of (Boolean_Literals (Present (Subpool)), Loc)); |
ca5af305 AC |
1124 | end if; |
1125 | ||
d3f70b35 AC |
1126 | -- Step 2: Build a wrapper Allocate / Deallocate which internally |
1127 | -- calls Allocate_Any_Controlled / Deallocate_Any_Controlled. | |
1128 | ||
df3e68b1 HK |
1129 | -- Select the proper routine to call |
1130 | ||
1131 | if Is_Allocate then | |
d3f70b35 | 1132 | Proc_To_Call := RTE (RE_Allocate_Any_Controlled); |
df3e68b1 | 1133 | else |
d3f70b35 | 1134 | Proc_To_Call := RTE (RE_Deallocate_Any_Controlled); |
df3e68b1 HK |
1135 | end if; |
1136 | ||
1137 | -- Create a custom Allocate / Deallocate routine which has identical | |
1138 | -- profile to that of System.Storage_Pools. | |
1139 | ||
4c5e9870 SB |
1140 | declare |
1141 | -- P : Root_Storage_Pool | |
1142 | function Pool_Param return Node_Id is ( | |
1143 | Make_Parameter_Specification (Loc, | |
1144 | Defining_Identifier => Make_Temporary (Loc, 'P'), | |
1145 | Parameter_Type => | |
1146 | New_Occurrence_Of (RTE (RE_Root_Storage_Pool), Loc))); | |
1147 | ||
1148 | -- A : [out] Address | |
1149 | function Address_Param return Node_Id is ( | |
1150 | Make_Parameter_Specification (Loc, | |
1151 | Defining_Identifier => Addr_Id, | |
1152 | Out_Present => Is_Allocate, | |
1153 | Parameter_Type => | |
1154 | New_Occurrence_Of (RTE (RE_Address), Loc))); | |
1155 | ||
1156 | -- S : Storage_Count | |
1157 | function Size_Param return Node_Id is ( | |
1158 | Make_Parameter_Specification (Loc, | |
1159 | Defining_Identifier => Size_Id, | |
1160 | Parameter_Type => | |
1161 | New_Occurrence_Of (RTE (RE_Storage_Count), Loc))); | |
1162 | ||
1163 | -- L : Storage_Count | |
1164 | function Alignment_Param return Node_Id is ( | |
1165 | Make_Parameter_Specification (Loc, | |
1166 | Defining_Identifier => Alig_Id, | |
1167 | Parameter_Type => | |
1168 | New_Occurrence_Of (RTE (RE_Storage_Count), Loc))); | |
1169 | ||
1170 | Formal_Params : List_Id; | |
1171 | begin | |
1172 | if Use_Secondary_Stack_Pool then | |
1173 | -- Gigi expects a different profile in the Secondary_Stack_Pool | |
1174 | -- case. There must be no uses of the two missing formals | |
1175 | -- (i.e., Pool_Param and Alignment_Param) in this case. | |
1176 | Formal_Params := New_List (Address_Param, Size_Param); | |
1177 | else | |
1178 | Formal_Params := New_List ( | |
1179 | Pool_Param, Address_Param, Size_Param, Alignment_Param); | |
1180 | end if; | |
df3e68b1 | 1181 | |
4c5e9870 SB |
1182 | Insert_Action (N, |
1183 | Make_Subprogram_Body (Loc, | |
1184 | Specification => | |
1185 | -- procedure Pnn | |
1186 | Make_Procedure_Specification (Loc, | |
1187 | Defining_Unit_Name => Proc_Id, | |
1188 | Parameter_Specifications => Formal_Params), | |
1189 | ||
1190 | Declarations => No_List, | |
1191 | ||
1192 | Handled_Statement_Sequence => | |
1193 | Make_Handled_Sequence_Of_Statements (Loc, | |
1194 | Statements => New_List ( | |
1195 | Make_Procedure_Call_Statement (Loc, | |
1196 | Name => | |
1197 | New_Occurrence_Of (Proc_To_Call, Loc), | |
1198 | Parameter_Associations => Actuals)))), | |
1199 | Suppress => All_Checks); | |
1200 | end; | |
df3e68b1 HK |
1201 | |
1202 | -- The newly generated Allocate / Deallocate becomes the default | |
1203 | -- procedure to call when the back end processes the allocation / | |
1204 | -- deallocation. | |
1205 | ||
1206 | if Is_Allocate then | |
1207 | Set_Procedure_To_Call (Expr, Proc_Id); | |
1208 | else | |
1209 | Set_Procedure_To_Call (N, Proc_Id); | |
1210 | end if; | |
1211 | end; | |
1212 | end Build_Allocate_Deallocate_Proc; | |
1213 | ||
bb072d1c AC |
1214 | ------------------------------- |
1215 | -- Build_Abort_Undefer_Block -- | |
1216 | ------------------------------- | |
1217 | ||
1218 | function Build_Abort_Undefer_Block | |
1219 | (Loc : Source_Ptr; | |
1220 | Stmts : List_Id; | |
1221 | Context : Node_Id) return Node_Id | |
1222 | is | |
1223 | Exceptions_OK : constant Boolean := | |
1224 | not Restriction_Active (No_Exception_Propagation); | |
1225 | ||
1226 | AUD : Entity_Id; | |
1227 | Blk : Node_Id; | |
1228 | Blk_Id : Entity_Id; | |
1229 | HSS : Node_Id; | |
1230 | ||
1231 | begin | |
1232 | -- The block should be generated only when undeferring abort in the | |
1233 | -- context of a potential exception. | |
1234 | ||
1235 | pragma Assert (Abort_Allowed and Exceptions_OK); | |
1236 | ||
1237 | -- Generate: | |
1238 | -- begin | |
1239 | -- <Stmts> | |
1240 | -- at end | |
1241 | -- Abort_Undefer_Direct; | |
1242 | -- end; | |
1243 | ||
1244 | AUD := RTE (RE_Abort_Undefer_Direct); | |
1245 | ||
1246 | HSS := | |
1247 | Make_Handled_Sequence_Of_Statements (Loc, | |
1248 | Statements => Stmts, | |
1249 | At_End_Proc => New_Occurrence_Of (AUD, Loc)); | |
1250 | ||
1251 | Blk := | |
1252 | Make_Block_Statement (Loc, | |
1253 | Handled_Statement_Sequence => HSS); | |
1254 | Set_Is_Abort_Block (Blk); | |
1255 | ||
1256 | Add_Block_Identifier (Blk, Blk_Id); | |
1257 | Expand_At_End_Handler (HSS, Blk_Id); | |
1258 | ||
1259 | -- Present the Abort_Undefer_Direct function to the back end to inline | |
1260 | -- the call to the routine. | |
1261 | ||
1262 | Add_Inlined_Body (AUD, Context); | |
1263 | ||
1264 | return Blk; | |
1265 | end Build_Abort_Undefer_Block; | |
1266 | ||
f63d601b HK |
1267 | --------------------------------- |
1268 | -- Build_Class_Wide_Expression -- | |
1269 | --------------------------------- | |
1270 | ||
1271 | procedure Build_Class_Wide_Expression | |
a187206c AC |
1272 | (Prag : Node_Id; |
1273 | Subp : Entity_Id; | |
1274 | Par_Subp : Entity_Id; | |
1275 | Adjust_Sloc : Boolean; | |
1276 | Needs_Wrapper : out Boolean) | |
f63d601b HK |
1277 | is |
1278 | function Replace_Entity (N : Node_Id) return Traverse_Result; | |
1279 | -- Replace reference to formal of inherited operation or to primitive | |
1280 | -- operation of root type, with corresponding entity for derived type, | |
1281 | -- when constructing the class-wide condition of an overriding | |
1282 | -- subprogram. | |
1283 | ||
1284 | -------------------- | |
1285 | -- Replace_Entity -- | |
1286 | -------------------- | |
1287 | ||
1288 | function Replace_Entity (N : Node_Id) return Traverse_Result is | |
1289 | New_E : Entity_Id; | |
1290 | ||
1291 | begin | |
1292 | if Adjust_Sloc then | |
1293 | Adjust_Inherited_Pragma_Sloc (N); | |
1294 | end if; | |
1295 | ||
1296 | if Nkind (N) = N_Identifier | |
1297 | and then Present (Entity (N)) | |
1298 | and then | |
1299 | (Is_Formal (Entity (N)) or else Is_Subprogram (Entity (N))) | |
1300 | and then | |
1301 | (Nkind (Parent (N)) /= N_Attribute_Reference | |
1302 | or else Attribute_Name (Parent (N)) /= Name_Class) | |
1303 | then | |
1304 | -- The replacement does not apply to dispatching calls within the | |
1305 | -- condition, but only to calls whose static tag is that of the | |
1306 | -- parent type. | |
1307 | ||
1308 | if Is_Subprogram (Entity (N)) | |
1309 | and then Nkind (Parent (N)) = N_Function_Call | |
1310 | and then Present (Controlling_Argument (Parent (N))) | |
1311 | then | |
1312 | return OK; | |
1313 | end if; | |
1314 | ||
1315 | -- Determine whether entity has a renaming | |
1316 | ||
b619c88e | 1317 | New_E := Type_Map.Get (Entity (N)); |
f63d601b HK |
1318 | |
1319 | if Present (New_E) then | |
1320 | Rewrite (N, New_Occurrence_Of (New_E, Sloc (N))); | |
a187206c | 1321 | |
10fdda1c HK |
1322 | -- AI12-0166: a precondition for a protected operation |
1323 | -- cannot include an internal call to a protected function | |
1324 | -- of the type. In the case of an inherited condition for an | |
1325 | -- overriding operation, both the operation and the function | |
1326 | -- are given by primitive wrappers. | |
2d6f6e08 | 1327 | -- Move this check to sem??? |
5cb78fb8 ES |
1328 | |
1329 | if Ekind (New_E) = E_Function | |
1330 | and then Is_Primitive_Wrapper (New_E) | |
1331 | and then Is_Primitive_Wrapper (Subp) | |
1332 | and then Scope (Subp) = Scope (New_E) | |
9f0d76ec | 1333 | and then Chars (Pragma_Identifier (Prag)) = Name_Precondition |
5cb78fb8 ES |
1334 | then |
1335 | Error_Msg_Node_2 := Wrapped_Entity (Subp); | |
1336 | Error_Msg_NE | |
1337 | ("internal call to& cannot appear in inherited " | |
1338 | & "precondition of protected operation&", | |
10fdda1c | 1339 | N, Wrapped_Entity (New_E)); |
5cb78fb8 ES |
1340 | end if; |
1341 | ||
ef952fd5 HK |
1342 | -- If the entity is an overridden primitive and we are not |
1343 | -- in GNATprove mode, we must build a wrapper for the current | |
8ab31c0c AC |
1344 | -- inherited operation. If the reference is the prefix of an |
1345 | -- attribute such as 'Result (or others ???) there is no need | |
e6326de5 | 1346 | -- for a wrapper: the condition is just rewritten in terms of |
8ab31c0c AC |
1347 | -- the inherited subprogram. |
1348 | ||
1349 | if Is_Subprogram (New_E) | |
1350 | and then Nkind (Parent (N)) /= N_Attribute_Reference | |
ef952fd5 | 1351 | and then not GNATprove_Mode |
8ab31c0c | 1352 | then |
a187206c AC |
1353 | Needs_Wrapper := True; |
1354 | end if; | |
f63d601b HK |
1355 | end if; |
1356 | ||
1357 | -- Check that there are no calls left to abstract operations if | |
1358 | -- the current subprogram is not abstract. | |
2d6f6e08 | 1359 | -- Move this check to sem??? |
f63d601b HK |
1360 | |
1361 | if Nkind (Parent (N)) = N_Function_Call | |
1362 | and then N = Name (Parent (N)) | |
1363 | then | |
1364 | if not Is_Abstract_Subprogram (Subp) | |
1365 | and then Is_Abstract_Subprogram (Entity (N)) | |
1366 | then | |
3b2249aa | 1367 | Error_Msg_Sloc := Sloc (Current_Scope); |
6dd86c75 AC |
1368 | Error_Msg_Node_2 := Subp; |
1369 | if Comes_From_Source (Subp) then | |
1370 | Error_Msg_NE | |
3b2249aa HK |
1371 | ("cannot call abstract subprogram & in inherited " |
1372 | & "condition for&#", Subp, Entity (N)); | |
6dd86c75 AC |
1373 | else |
1374 | Error_Msg_NE | |
3b2249aa HK |
1375 | ("cannot call abstract subprogram & in inherited " |
1376 | & "condition for inherited&#", Subp, Entity (N)); | |
6dd86c75 | 1377 | end if; |
f63d601b HK |
1378 | |
1379 | -- In SPARK mode, reject an inherited condition for an | |
1380 | -- inherited operation if it contains a call to an overriding | |
e51102b2 | 1381 | -- operation, because this implies that the pre/postconditions |
f63d601b HK |
1382 | -- of the inherited operation have changed silently. |
1383 | ||
1384 | elsif SPARK_Mode = On | |
1385 | and then Warn_On_Suspicious_Contract | |
1386 | and then Present (Alias (Subp)) | |
1387 | and then Present (New_E) | |
1388 | and then Comes_From_Source (New_E) | |
1389 | then | |
1390 | Error_Msg_N | |
1391 | ("cannot modify inherited condition (SPARK RM 6.1.1(1))", | |
1392 | Parent (Subp)); | |
1393 | Error_Msg_Sloc := Sloc (New_E); | |
1394 | Error_Msg_Node_2 := Subp; | |
1395 | Error_Msg_NE | |
1396 | ("\overriding of&# forces overriding of&", | |
1397 | Parent (Subp), New_E); | |
1398 | end if; | |
1399 | end if; | |
1400 | ||
1401 | -- Update type of function call node, which should be the same as | |
1402 | -- the function's return type. | |
1403 | ||
1404 | if Is_Subprogram (Entity (N)) | |
1405 | and then Nkind (Parent (N)) = N_Function_Call | |
1406 | then | |
1407 | Set_Etype (Parent (N), Etype (Entity (N))); | |
1408 | end if; | |
1409 | ||
1410 | -- The whole expression will be reanalyzed | |
1411 | ||
1412 | elsif Nkind (N) in N_Has_Etype then | |
1413 | Set_Analyzed (N, False); | |
1414 | end if; | |
1415 | ||
1416 | return OK; | |
1417 | end Replace_Entity; | |
1418 | ||
1419 | procedure Replace_Condition_Entities is | |
1420 | new Traverse_Proc (Replace_Entity); | |
1421 | ||
1422 | -- Local variables | |
1423 | ||
1424 | Par_Formal : Entity_Id; | |
1425 | Subp_Formal : Entity_Id; | |
1426 | ||
1427 | -- Start of processing for Build_Class_Wide_Expression | |
1428 | ||
1429 | begin | |
a187206c AC |
1430 | Needs_Wrapper := False; |
1431 | ||
f63d601b HK |
1432 | -- Add mapping from old formals to new formals |
1433 | ||
1434 | Par_Formal := First_Formal (Par_Subp); | |
1435 | Subp_Formal := First_Formal (Subp); | |
1436 | ||
1437 | while Present (Par_Formal) and then Present (Subp_Formal) loop | |
b619c88e | 1438 | Type_Map.Set (Par_Formal, Subp_Formal); |
f63d601b HK |
1439 | Next_Formal (Par_Formal); |
1440 | Next_Formal (Subp_Formal); | |
1441 | end loop; | |
1442 | ||
1443 | Replace_Condition_Entities (Prag); | |
1444 | end Build_Class_Wide_Expression; | |
1445 | ||
1446 | -------------------- | |
1447 | -- Build_DIC_Call -- | |
1448 | -------------------- | |
1449 | ||
1450 | function Build_DIC_Call | |
f7937111 GD |
1451 | (Loc : Source_Ptr; |
1452 | Obj_Name : Node_Id; | |
1453 | Typ : Entity_Id) return Node_Id | |
f63d601b HK |
1454 | is |
1455 | Proc_Id : constant Entity_Id := DIC_Procedure (Typ); | |
1456 | Formal_Typ : constant Entity_Id := Etype (First_Formal (Proc_Id)); | |
1457 | ||
1458 | begin | |
f7937111 GD |
1459 | -- The DIC procedure has a null body if assertions are disabled or |
1460 | -- Assertion_Policy Ignore is in effect. In that case, it would be | |
1461 | -- nice to generate a null statement instead of a call to the DIC | |
1462 | -- procedure, but doing that seems to interfere with the determination | |
1463 | -- of ECRs (early call regions) in SPARK. ??? | |
1464 | ||
f63d601b HK |
1465 | return |
1466 | Make_Procedure_Call_Statement (Loc, | |
1467 | Name => New_Occurrence_Of (Proc_Id, Loc), | |
1468 | Parameter_Associations => New_List ( | |
1469 | Make_Unchecked_Type_Conversion (Loc, | |
1470 | Subtype_Mark => New_Occurrence_Of (Formal_Typ, Loc), | |
f7937111 | 1471 | Expression => Obj_Name))); |
f63d601b HK |
1472 | end Build_DIC_Call; |
1473 | ||
1474 | ------------------------------ | |
1475 | -- Build_DIC_Procedure_Body -- | |
1476 | ------------------------------ | |
1477 | ||
b0bf18ad AC |
1478 | -- WARNING: This routine manages Ghost regions. Return statements must be |
1479 | -- replaced by gotos which jump to the end of the routine and restore the | |
1480 | -- Ghost mode. | |
1481 | ||
b619c88e | 1482 | procedure Build_DIC_Procedure_Body |
f7937111 GD |
1483 | (Typ : Entity_Id; |
1484 | Partial_DIC : Boolean := False) | |
b619c88e | 1485 | is |
f7937111 GD |
1486 | Pragmas_Seen : Elist_Id := No_Elist; |
1487 | -- This list contains all DIC pragmas processed so far. The list is used | |
1488 | -- to avoid redundant Default_Initial_Condition checks. | |
1489 | ||
f63d601b HK |
1490 | procedure Add_DIC_Check |
1491 | (DIC_Prag : Node_Id; | |
1492 | DIC_Expr : Node_Id; | |
1493 | Stmts : in out List_Id); | |
1494 | -- Subsidiary to all Add_xxx_DIC routines. Add a runtime check to verify | |
1495 | -- assertion expression DIC_Expr of pragma DIC_Prag. All generated code | |
1496 | -- is added to list Stmts. | |
1497 | ||
1498 | procedure Add_Inherited_DIC | |
1499 | (DIC_Prag : Node_Id; | |
1500 | Par_Typ : Entity_Id; | |
1501 | Deriv_Typ : Entity_Id; | |
1502 | Stmts : in out List_Id); | |
1503 | -- Add a runtime check to verify the assertion expression of inherited | |
e51102b2 | 1504 | -- pragma DIC_Prag. Par_Typ is parent type, which is also the owner of |
f63d601b HK |
1505 | -- the DIC pragma. Deriv_Typ is the derived type inheriting the DIC |
1506 | -- pragma. All generated code is added to list Stmts. | |
1507 | ||
1508 | procedure Add_Inherited_Tagged_DIC | |
f7937111 GD |
1509 | (DIC_Prag : Node_Id; |
1510 | Expr : Node_Id; | |
1511 | Stmts : in out List_Id); | |
f63d601b | 1512 | -- Add a runtime check to verify assertion expression DIC_Expr of |
f7937111 GD |
1513 | -- inherited pragma DIC_Prag. This routine applies class-wide pre- |
1514 | -- and postcondition-like runtime semantics to the check. Expr is | |
1515 | -- the assertion expression after substitition has been performed | |
1516 | -- (via Replace_References). All generated code is added to list Stmts. | |
1517 | ||
1518 | procedure Add_Inherited_DICs | |
1519 | (T : Entity_Id; | |
1520 | Priv_Typ : Entity_Id; | |
1521 | Full_Typ : Entity_Id; | |
1522 | Obj_Id : Entity_Id; | |
1523 | Checks : in out List_Id); | |
1524 | -- Generate a DIC check for each inherited Default_Initial_Condition | |
1525 | -- coming from all parent types of type T. Priv_Typ and Full_Typ denote | |
1526 | -- the partial and full view of the parent type. Obj_Id denotes the | |
1527 | -- entity of the _object formal parameter of the DIC procedure. All | |
1528 | -- created checks are added to list Checks. | |
f63d601b HK |
1529 | |
1530 | procedure Add_Own_DIC | |
1531 | (DIC_Prag : Node_Id; | |
1532 | DIC_Typ : Entity_Id; | |
f7937111 | 1533 | Obj_Id : Entity_Id; |
f63d601b HK |
1534 | Stmts : in out List_Id); |
1535 | -- Add a runtime check to verify the assertion expression of pragma | |
f7937111 GD |
1536 | -- DIC_Prag. DIC_Typ is the owner of the DIC pragma. Obj_Id is the |
1537 | -- object to substitute in the assertion expression for any references | |
1538 | -- to the current instance of the type All generated code is added to | |
1539 | -- list Stmts. | |
1540 | ||
1541 | procedure Add_Parent_DICs | |
1542 | (T : Entity_Id; | |
1543 | Obj_Id : Entity_Id; | |
1544 | Checks : in out List_Id); | |
1545 | -- Generate a Default_Initial_Condition check for each inherited DIC | |
1546 | -- aspect coming from all parent types of type T. Obj_Id denotes the | |
1547 | -- entity of the _object formal parameter of the DIC procedure. All | |
1548 | -- created checks are added to list Checks. | |
f63d601b | 1549 | |
f63d601b HK |
1550 | ------------------- |
1551 | -- Add_DIC_Check -- | |
1552 | ------------------- | |
1553 | ||
1554 | procedure Add_DIC_Check | |
1555 | (DIC_Prag : Node_Id; | |
1556 | DIC_Expr : Node_Id; | |
1557 | Stmts : in out List_Id) | |
1558 | is | |
1559 | Loc : constant Source_Ptr := Sloc (DIC_Prag); | |
1560 | Nam : constant Name_Id := Original_Aspect_Pragma_Name (DIC_Prag); | |
1561 | ||
1562 | begin | |
1563 | -- The DIC pragma is ignored, nothing left to do | |
1564 | ||
1565 | if Is_Ignored (DIC_Prag) then | |
1566 | null; | |
1567 | ||
ca0b6141 AC |
1568 | -- Otherwise the DIC expression must be checked at run time. |
1569 | -- Generate: | |
f63d601b HK |
1570 | |
1571 | -- pragma Check (<Nam>, <DIC_Expr>); | |
1572 | ||
1573 | else | |
1574 | Append_New_To (Stmts, | |
1575 | Make_Pragma (Loc, | |
1576 | Pragma_Identifier => | |
1577 | Make_Identifier (Loc, Name_Check), | |
1578 | ||
1579 | Pragma_Argument_Associations => New_List ( | |
1580 | Make_Pragma_Argument_Association (Loc, | |
1581 | Expression => Make_Identifier (Loc, Nam)), | |
1582 | ||
1583 | Make_Pragma_Argument_Association (Loc, | |
1584 | Expression => DIC_Expr)))); | |
1585 | end if; | |
f7937111 GD |
1586 | |
1587 | -- Add the pragma to the list of processed pragmas | |
1588 | ||
1589 | Append_New_Elmt (DIC_Prag, Pragmas_Seen); | |
f63d601b HK |
1590 | end Add_DIC_Check; |
1591 | ||
1592 | ----------------------- | |
1593 | -- Add_Inherited_DIC -- | |
1594 | ----------------------- | |
1595 | ||
1596 | procedure Add_Inherited_DIC | |
1597 | (DIC_Prag : Node_Id; | |
1598 | Par_Typ : Entity_Id; | |
1599 | Deriv_Typ : Entity_Id; | |
1600 | Stmts : in out List_Id) | |
1601 | is | |
1602 | Deriv_Proc : constant Entity_Id := DIC_Procedure (Deriv_Typ); | |
1603 | Deriv_Obj : constant Entity_Id := First_Entity (Deriv_Proc); | |
1604 | Par_Proc : constant Entity_Id := DIC_Procedure (Par_Typ); | |
1605 | Par_Obj : constant Entity_Id := First_Entity (Par_Proc); | |
1606 | Loc : constant Source_Ptr := Sloc (DIC_Prag); | |
1607 | ||
1608 | begin | |
1609 | pragma Assert (Present (Deriv_Proc) and then Present (Par_Proc)); | |
1610 | ||
1611 | -- Verify the inherited DIC assertion expression by calling the DIC | |
1612 | -- procedure of the parent type. | |
1613 | ||
1614 | -- Generate: | |
1615 | -- <Par_Typ>DIC (Par_Typ (_object)); | |
1616 | ||
1617 | Append_New_To (Stmts, | |
1618 | Make_Procedure_Call_Statement (Loc, | |
1619 | Name => New_Occurrence_Of (Par_Proc, Loc), | |
1620 | Parameter_Associations => New_List ( | |
1621 | Convert_To | |
1622 | (Typ => Etype (Par_Obj), | |
1623 | Expr => New_Occurrence_Of (Deriv_Obj, Loc))))); | |
1624 | end Add_Inherited_DIC; | |
1625 | ||
1626 | ------------------------------ | |
1627 | -- Add_Inherited_Tagged_DIC -- | |
1628 | ------------------------------ | |
1629 | ||
1630 | procedure Add_Inherited_Tagged_DIC | |
f7937111 GD |
1631 | (DIC_Prag : Node_Id; |
1632 | Expr : Node_Id; | |
1633 | Stmts : in out List_Id) | |
f63d601b | 1634 | is |
f7937111 GD |
1635 | begin |
1636 | -- Once the DIC assertion expression is fully processed, add a check | |
1637 | -- to the statements of the DIC procedure. | |
f63d601b | 1638 | |
f7937111 GD |
1639 | Add_DIC_Check |
1640 | (DIC_Prag => DIC_Prag, | |
1641 | DIC_Expr => Expr, | |
1642 | Stmts => Stmts); | |
1643 | end Add_Inherited_Tagged_DIC; | |
1644 | ||
1645 | ------------------------ | |
1646 | -- Add_Inherited_DICs -- | |
1647 | ------------------------ | |
1648 | ||
1649 | procedure Add_Inherited_DICs | |
1650 | (T : Entity_Id; | |
1651 | Priv_Typ : Entity_Id; | |
1652 | Full_Typ : Entity_Id; | |
1653 | Obj_Id : Entity_Id; | |
1654 | Checks : in out List_Id) | |
1655 | is | |
1656 | Deriv_Typ : Entity_Id; | |
1657 | Expr : Node_Id; | |
1658 | Prag : Node_Id; | |
1659 | Prag_Expr : Node_Id; | |
1660 | Prag_Expr_Arg : Node_Id; | |
1661 | Prag_Typ : Node_Id; | |
1662 | Prag_Typ_Arg : Node_Id; | |
1663 | ||
1664 | Par_Proc : Entity_Id; | |
1665 | -- The "partial" invariant procedure of Par_Typ | |
1666 | ||
1667 | Par_Typ : Entity_Id; | |
1668 | -- The suitable view of the parent type used in the substitution of | |
1669 | -- type attributes. | |
f63d601b HK |
1670 | |
1671 | begin | |
f7937111 GD |
1672 | if not Present (Priv_Typ) and then not Present (Full_Typ) then |
1673 | return; | |
1674 | end if; | |
f63d601b | 1675 | |
f7937111 GD |
1676 | -- When the type inheriting the class-wide invariant is a concurrent |
1677 | -- type, use the corresponding record type because it contains all | |
1678 | -- primitive operations of the concurrent type and allows for proper | |
1679 | -- substitution. | |
f63d601b | 1680 | |
f7937111 GD |
1681 | if Is_Concurrent_Type (T) then |
1682 | Deriv_Typ := Corresponding_Record_Type (T); | |
1683 | else | |
1684 | Deriv_Typ := T; | |
1685 | end if; | |
f63d601b | 1686 | |
f7937111 | 1687 | pragma Assert (Present (Deriv_Typ)); |
f63d601b | 1688 | |
f7937111 GD |
1689 | -- Determine which rep item chain to use. Precedence is given to that |
1690 | -- of the parent type's partial view since it usually carries all the | |
1691 | -- class-wide invariants. | |
b619c88e | 1692 | |
f7937111 GD |
1693 | if Present (Priv_Typ) then |
1694 | Prag := First_Rep_Item (Priv_Typ); | |
1695 | else | |
1696 | Prag := First_Rep_Item (Full_Typ); | |
1697 | end if; | |
f63d601b | 1698 | |
f7937111 GD |
1699 | while Present (Prag) loop |
1700 | if Nkind (Prag) = N_Pragma | |
1701 | and then Pragma_Name (Prag) = Name_Default_Initial_Condition | |
1702 | then | |
1703 | -- Nothing to do if the pragma was already processed | |
f63d601b | 1704 | |
f7937111 GD |
1705 | if Contains (Pragmas_Seen, Prag) then |
1706 | return; | |
1707 | end if; | |
f63d601b | 1708 | |
f7937111 | 1709 | -- Extract arguments of the Default_Initial_Condition pragma |
27bb7941 | 1710 | |
f7937111 GD |
1711 | Prag_Expr_Arg := First (Pragma_Argument_Associations (Prag)); |
1712 | Prag_Expr := Expression_Copy (Prag_Expr_Arg); | |
f63d601b | 1713 | |
f7937111 GD |
1714 | -- Pick up the implicit second argument of the pragma, which |
1715 | -- indicates the type that the pragma applies to. | |
f63d601b | 1716 | |
f7937111 GD |
1717 | Prag_Typ_Arg := Next (Prag_Expr_Arg); |
1718 | if Present (Prag_Typ_Arg) then | |
1719 | Prag_Typ := Get_Pragma_Arg (Prag_Typ_Arg); | |
1720 | else | |
1721 | Prag_Typ := Empty; | |
1722 | end if; | |
1723 | ||
1724 | -- The pragma applies to the partial view of the parent type | |
1725 | ||
1726 | if Present (Priv_Typ) | |
1727 | and then Present (Prag_Typ) | |
1728 | and then Entity (Prag_Typ) = Priv_Typ | |
1729 | then | |
1730 | Par_Typ := Priv_Typ; | |
1731 | ||
1732 | -- The pragma applies to the full view of the parent type | |
1733 | ||
1734 | elsif Present (Full_Typ) | |
1735 | and then Present (Prag_Typ) | |
1736 | and then Entity (Prag_Typ) = Full_Typ | |
1737 | then | |
1738 | Par_Typ := Full_Typ; | |
1739 | ||
1740 | -- Otherwise the pragma does not belong to the parent type and | |
1741 | -- should not be considered. | |
1742 | ||
1743 | else | |
1744 | return; | |
1745 | end if; | |
1746 | ||
1747 | -- Substitute references in the DIC expression that are related | |
1748 | -- to the partial type with corresponding references related to | |
1749 | -- the derived type (call to Replace_References below). | |
1750 | ||
1751 | Expr := New_Copy_Tree (Prag_Expr); | |
1752 | ||
1753 | Par_Proc := Partial_DIC_Procedure (Par_Typ); | |
1754 | ||
1755 | -- If there's not a partial DIC procedure (such as when a | |
1756 | -- full type doesn't have its own DIC, but is inherited from | |
1757 | -- a type with DIC), get the full DIC procedure. | |
1758 | ||
1759 | if not Present (Par_Proc) then | |
1760 | Par_Proc := DIC_Procedure (Par_Typ); | |
1761 | end if; | |
1762 | ||
1763 | Replace_References | |
1764 | (Expr => Expr, | |
1765 | Par_Typ => Par_Typ, | |
1766 | Deriv_Typ => Deriv_Typ, | |
1767 | Par_Obj => First_Formal (Par_Proc), | |
1768 | Deriv_Obj => Obj_Id); | |
1769 | ||
1770 | -- Why are there different actions depending on whether T is | |
1771 | -- tagged? Can these be unified? ??? | |
1772 | ||
1773 | if Is_Tagged_Type (T) then | |
1774 | Add_Inherited_Tagged_DIC | |
1775 | (DIC_Prag => Prag, | |
1776 | Expr => Expr, | |
1777 | Stmts => Checks); | |
1778 | ||
1779 | else | |
1780 | Add_Inherited_DIC | |
1781 | (DIC_Prag => Prag, | |
1782 | Par_Typ => Par_Typ, | |
1783 | Deriv_Typ => Deriv_Typ, | |
1784 | Stmts => Checks); | |
1785 | end if; | |
1786 | ||
1787 | -- Leave as soon as we get a DIC pragma, since we'll visit | |
1788 | -- the pragmas of the parents, so will get to any "inherited" | |
1789 | -- pragmas that way. | |
1790 | ||
1791 | return; | |
1792 | end if; | |
1793 | ||
1794 | Next_Rep_Item (Prag); | |
1795 | end loop; | |
1796 | end Add_Inherited_DICs; | |
f63d601b HK |
1797 | |
1798 | ----------------- | |
1799 | -- Add_Own_DIC -- | |
1800 | ----------------- | |
1801 | ||
1802 | procedure Add_Own_DIC | |
1803 | (DIC_Prag : Node_Id; | |
1804 | DIC_Typ : Entity_Id; | |
f7937111 | 1805 | Obj_Id : Entity_Id; |
f63d601b HK |
1806 | Stmts : in out List_Id) |
1807 | is | |
1808 | DIC_Args : constant List_Id := | |
1809 | Pragma_Argument_Associations (DIC_Prag); | |
1810 | DIC_Arg : constant Node_Id := First (DIC_Args); | |
1811 | DIC_Asp : constant Node_Id := Corresponding_Aspect (DIC_Prag); | |
1812 | DIC_Expr : constant Node_Id := Get_Pragma_Arg (DIC_Arg); | |
f63d601b | 1813 | |
f63d601b HK |
1814 | -- Local variables |
1815 | ||
1816 | Typ_Decl : constant Node_Id := Declaration_Node (DIC_Typ); | |
1817 | ||
1818 | Expr : Node_Id; | |
1819 | ||
1820 | -- Start of processing for Add_Own_DIC | |
1821 | ||
1822 | begin | |
b3801819 | 1823 | pragma Assert (Present (DIC_Expr)); |
f63d601b HK |
1824 | Expr := New_Copy_Tree (DIC_Expr); |
1825 | ||
e51102b2 | 1826 | -- Perform the following substitution: |
f63d601b HK |
1827 | |
1828 | -- * Replace the current instance of DIC_Typ with a reference to | |
1829 | -- the _object formal parameter of the DIC procedure. | |
1830 | ||
1831 | Replace_Type_References | |
1832 | (Expr => Expr, | |
1833 | Typ => DIC_Typ, | |
1834 | Obj_Id => Obj_Id); | |
1835 | ||
1836 | -- Preanalyze the DIC expression to detect errors and at the same | |
1837 | -- time capture the visibility of the proper package part. | |
1838 | ||
1839 | Set_Parent (Expr, Typ_Decl); | |
1840 | Preanalyze_Assert_Expression (Expr, Any_Boolean); | |
1841 | ||
1842 | -- Save a copy of the expression with all replacements and analysis | |
1843 | -- already taken place in case a derived type inherits the pragma. | |
1844 | -- The copy will be used as the foundation of the derived type's own | |
1845 | -- version of the DIC assertion expression. | |
1846 | ||
1847 | if Is_Tagged_Type (DIC_Typ) then | |
1848 | Set_Expression_Copy (DIC_Arg, New_Copy_Tree (Expr)); | |
1849 | end if; | |
1850 | ||
1851 | -- If the pragma comes from an aspect specification, replace the | |
1852 | -- saved expression because all type references must be substituted | |
1853 | -- for the call to Preanalyze_Spec_Expression in Check_Aspect_At_xxx | |
1854 | -- routines. | |
1855 | ||
1856 | if Present (DIC_Asp) then | |
1857 | Set_Entity (Identifier (DIC_Asp), New_Copy_Tree (Expr)); | |
1858 | end if; | |
1859 | ||
f63d601b | 1860 | -- Once the DIC assertion expression is fully processed, add a check |
d2e59934 GD |
1861 | -- to the statements of the DIC procedure (unless the type is an |
1862 | -- abstract type, in which case we don't want the possibility of | |
1863 | -- generating a call to an abstract function of the type; such DIC | |
1864 | -- procedures can never be called in any case, so not generating the | |
1865 | -- check at all is OK). | |
1866 | ||
427c07a2 | 1867 | if not Is_Abstract_Type (DIC_Typ) or else GNATprove_Mode then |
d2e59934 GD |
1868 | Add_DIC_Check |
1869 | (DIC_Prag => DIC_Prag, | |
1870 | DIC_Expr => Expr, | |
1871 | Stmts => Stmts); | |
1872 | end if; | |
f63d601b HK |
1873 | end Add_Own_DIC; |
1874 | ||
f7937111 GD |
1875 | --------------------- |
1876 | -- Add_Parent_DICs -- | |
1877 | --------------------- | |
1878 | ||
1879 | procedure Add_Parent_DICs | |
1880 | (T : Entity_Id; | |
1881 | Obj_Id : Entity_Id; | |
1882 | Checks : in out List_Id) | |
1883 | is | |
1884 | Dummy_1 : Entity_Id; | |
1885 | Dummy_2 : Entity_Id; | |
1886 | ||
1887 | Curr_Typ : Entity_Id; | |
1888 | -- The entity of the current type being examined | |
1889 | ||
1890 | Full_Typ : Entity_Id; | |
1891 | -- The full view of Par_Typ | |
1892 | ||
1893 | Par_Typ : Entity_Id; | |
1894 | -- The entity of the parent type | |
1895 | ||
1896 | Priv_Typ : Entity_Id; | |
1897 | -- The partial view of Par_Typ | |
1898 | ||
1899 | begin | |
1900 | -- Climb the parent type chain | |
1901 | ||
1902 | Curr_Typ := T; | |
1903 | loop | |
1904 | -- Do not consider subtypes, as they inherit the DICs from their | |
1905 | -- base types. | |
1906 | ||
1907 | Par_Typ := Base_Type (Etype (Base_Type (Curr_Typ))); | |
1908 | ||
1909 | -- Stop the climb once the root of the parent chain is | |
1910 | -- reached. | |
1911 | ||
1912 | exit when Curr_Typ = Par_Typ; | |
1913 | ||
1914 | -- Process the DICs of the parent type | |
1915 | ||
1916 | Get_Views (Par_Typ, Priv_Typ, Full_Typ, Dummy_1, Dummy_2); | |
1917 | ||
1918 | -- Only try to inherit a DIC pragma from the parent type Par_Typ | |
1919 | -- if it Has_Own_DIC pragma. The loop will proceed up the parent | |
1920 | -- chain to find all types that have their own DIC. | |
1921 | ||
1922 | if Has_Own_DIC (Par_Typ) then | |
1923 | Add_Inherited_DICs | |
1924 | (T => T, | |
1925 | Priv_Typ => Priv_Typ, | |
1926 | Full_Typ => Full_Typ, | |
1927 | Obj_Id => Obj_Id, | |
1928 | Checks => Checks); | |
1929 | end if; | |
1930 | ||
1931 | Curr_Typ := Par_Typ; | |
1932 | end loop; | |
1933 | end Add_Parent_DICs; | |
1934 | ||
f63d601b HK |
1935 | -- Local variables |
1936 | ||
1937 | Loc : constant Source_Ptr := Sloc (Typ); | |
1938 | ||
9057bd6a HK |
1939 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
1940 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
1941 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 | 1942 | |
f63d601b HK |
1943 | DIC_Prag : Node_Id; |
1944 | DIC_Typ : Entity_Id; | |
1945 | Dummy_1 : Entity_Id; | |
1946 | Dummy_2 : Entity_Id; | |
1947 | Proc_Body : Node_Id; | |
1948 | Proc_Body_Id : Entity_Id; | |
1949 | Proc_Decl : Node_Id; | |
1950 | Proc_Id : Entity_Id; | |
1951 | Stmts : List_Id := No_List; | |
1952 | ||
f7937111 GD |
1953 | CRec_Typ : Entity_Id := Empty; |
1954 | -- The corresponding record type of Full_Typ | |
1955 | ||
1956 | Full_Typ : Entity_Id := Empty; | |
1957 | -- The full view of the working type | |
1958 | ||
1959 | Obj_Id : Entity_Id := Empty; | |
1960 | -- The _object formal parameter of the invariant procedure | |
1961 | ||
1962 | Part_Proc : Entity_Id := Empty; | |
1963 | -- The entity of the "partial" invariant procedure | |
1964 | ||
1965 | Priv_Typ : Entity_Id := Empty; | |
1966 | -- The partial view of the working type | |
b619c88e | 1967 | |
f63d601b HK |
1968 | Work_Typ : Entity_Id; |
1969 | -- The working type | |
1970 | ||
1971 | -- Start of processing for Build_DIC_Procedure_Body | |
1972 | ||
1973 | begin | |
ce06d641 | 1974 | Work_Typ := Base_Type (Typ); |
f63d601b | 1975 | |
ce06d641 AC |
1976 | -- Do not process class-wide types as these are Itypes, but lack a first |
1977 | -- subtype (see below). | |
f63d601b | 1978 | |
ce06d641 AC |
1979 | if Is_Class_Wide_Type (Work_Typ) then |
1980 | return; | |
1981 | ||
1982 | -- Do not process the underlying full view of a private type. There is | |
1983 | -- no way to get back to the partial view, plus the body will be built | |
1984 | -- by the full view or the base type. | |
1985 | ||
1986 | elsif Is_Underlying_Full_View (Work_Typ) then | |
1987 | return; | |
1988 | ||
1989 | -- Use the first subtype when dealing with various base types | |
1990 | ||
1991 | elsif Is_Itype (Work_Typ) then | |
f63d601b HK |
1992 | Work_Typ := First_Subtype (Work_Typ); |
1993 | ||
1994 | -- The input denotes the corresponding record type of a protected or a | |
1995 | -- task type. Work with the concurrent type because the corresponding | |
1996 | -- record type may not be visible to clients of the type. | |
1997 | ||
1998 | elsif Ekind (Work_Typ) = E_Record_Type | |
1999 | and then Is_Concurrent_Record_Type (Work_Typ) | |
2000 | then | |
2001 | Work_Typ := Corresponding_Concurrent_Type (Work_Typ); | |
2002 | end if; | |
2003 | ||
d65a80fd HK |
2004 | -- The working type may be subject to pragma Ghost. Set the mode now to |
2005 | -- ensure that the DIC procedure is properly marked as Ghost. | |
2006 | ||
f9a8f910 | 2007 | Set_Ghost_Mode (Work_Typ); |
d65a80fd | 2008 | |
f63d601b HK |
2009 | -- The working type must be either define a DIC pragma of its own or |
2010 | -- inherit one from a parent type. | |
2011 | ||
2012 | pragma Assert (Has_DIC (Work_Typ)); | |
2013 | ||
2014 | -- Recover the type which defines the DIC pragma. This is either the | |
2015 | -- working type itself or a parent type when the pragma is inherited. | |
2016 | ||
2017 | DIC_Typ := Find_DIC_Type (Work_Typ); | |
2018 | pragma Assert (Present (DIC_Typ)); | |
2019 | ||
2020 | DIC_Prag := Get_Pragma (DIC_Typ, Pragma_Default_Initial_Condition); | |
2021 | pragma Assert (Present (DIC_Prag)); | |
2022 | ||
2023 | -- Nothing to do if pragma DIC appears without an argument or its sole | |
2024 | -- argument is "null". | |
2025 | ||
2026 | if not Is_Verifiable_DIC_Pragma (DIC_Prag) then | |
d65a80fd | 2027 | goto Leave; |
f63d601b HK |
2028 | end if; |
2029 | ||
f7937111 GD |
2030 | -- Obtain both views of the type |
2031 | ||
2032 | Get_Views (Work_Typ, Priv_Typ, Full_Typ, Dummy_1, CRec_Typ); | |
f63d601b | 2033 | |
f7937111 | 2034 | -- The caller requests a body for the partial DIC procedure |
f63d601b | 2035 | |
f7937111 GD |
2036 | if Partial_DIC then |
2037 | Proc_Id := Partial_DIC_Procedure (Work_Typ); | |
f63d601b | 2038 | |
f7937111 | 2039 | -- The "full" DIC procedure body was already created |
f63d601b | 2040 | |
f7937111 GD |
2041 | -- Create a declaration for the "partial" DIC procedure if it |
2042 | -- is not available. | |
2043 | ||
2044 | if No (Proc_Id) then | |
2045 | Build_DIC_Procedure_Declaration | |
2046 | (Typ => Work_Typ, | |
2047 | Partial_DIC => True); | |
f63d601b | 2048 | |
f7937111 GD |
2049 | Proc_Id := Partial_DIC_Procedure (Work_Typ); |
2050 | end if; | |
2051 | ||
2052 | -- The caller requests a body for the "full" DIC procedure | |
2053 | ||
2054 | else | |
2055 | Proc_Id := DIC_Procedure (Work_Typ); | |
2056 | Part_Proc := Partial_DIC_Procedure (Work_Typ); | |
2057 | ||
2058 | -- Create a declaration for the "full" DIC procedure if it is | |
2059 | -- not available. | |
2060 | ||
2061 | if No (Proc_Id) then | |
2062 | Build_DIC_Procedure_Declaration (Work_Typ); | |
2063 | Proc_Id := DIC_Procedure (Work_Typ); | |
2064 | end if; | |
f63d601b HK |
2065 | end if; |
2066 | ||
2067 | -- At this point there should be a DIC procedure declaration | |
2068 | ||
2069 | pragma Assert (Present (Proc_Id)); | |
2070 | Proc_Decl := Unit_Declaration_Node (Proc_Id); | |
2071 | ||
2072 | -- Nothing to do if the DIC procedure already has a body | |
2073 | ||
2074 | if Present (Corresponding_Body (Proc_Decl)) then | |
d65a80fd | 2075 | goto Leave; |
f63d601b HK |
2076 | end if; |
2077 | ||
f63d601b HK |
2078 | -- Emulate the environment of the DIC procedure by installing its scope |
2079 | -- and formal parameters. | |
2080 | ||
2081 | Push_Scope (Proc_Id); | |
2082 | Install_Formals (Proc_Id); | |
2083 | ||
f7937111 GD |
2084 | Obj_Id := First_Formal (Proc_Id); |
2085 | pragma Assert (Present (Obj_Id)); | |
f63d601b | 2086 | |
f7937111 GD |
2087 | -- The "partial" DIC procedure verifies the DICs of the partial view |
2088 | -- only. | |
f63d601b | 2089 | |
f7937111 GD |
2090 | if Partial_DIC then |
2091 | pragma Assert (Present (Priv_Typ)); | |
2092 | ||
2093 | if Has_Own_DIC (Work_Typ) then -- If we're testing this then maybe | |
2094 | Add_Own_DIC -- we shouldn't be calling Find_DIC_Typ above??? | |
2095 | (DIC_Prag => DIC_Prag, | |
2096 | DIC_Typ => DIC_Typ, -- Should this just be Work_Typ??? | |
2097 | Obj_Id => Obj_Id, | |
2098 | Stmts => Stmts); | |
2099 | end if; | |
f63d601b | 2100 | |
f7937111 GD |
2101 | -- Otherwise the "full" DIC procedure verifies the DICs of the full |
2102 | -- view, well as DICs inherited from parent types. In addition, it | |
2103 | -- indirectly verifies the DICs of the partial view by calling the | |
2104 | -- "partial" DIC procedure. | |
f63d601b | 2105 | |
f7937111 GD |
2106 | else |
2107 | pragma Assert (Present (Full_Typ)); | |
b619c88e | 2108 | |
f7937111 GD |
2109 | -- Check the DIC of the partial view by calling the "partial" DIC |
2110 | -- procedure, unless the partial DIC body is empty. Generate: | |
f63d601b | 2111 | |
f7937111 GD |
2112 | -- <Work_Typ>Partial_DIC (_object); |
2113 | ||
2114 | if Present (Part_Proc) and then not Has_Null_Body (Part_Proc) then | |
2115 | Append_New_To (Stmts, | |
2116 | Make_Procedure_Call_Statement (Loc, | |
2117 | Name => New_Occurrence_Of (Part_Proc, Loc), | |
2118 | Parameter_Associations => New_List ( | |
2119 | New_Occurrence_Of (Obj_Id, Loc)))); | |
2120 | end if; | |
f63d601b | 2121 | |
f7937111 | 2122 | -- Derived subtypes do not have a partial view |
f63d601b | 2123 | |
f7937111 | 2124 | if Present (Priv_Typ) then |
f63d601b | 2125 | |
f7937111 GD |
2126 | -- The processing of the "full" DIC procedure intentionally |
2127 | -- skips the partial view because a) this may result in changes of | |
2128 | -- visibility and b) lead to duplicate checks. However, when the | |
2129 | -- full view is the underlying full view of an untagged derived | |
2130 | -- type whose parent type is private, partial DICs appear on | |
2131 | -- the rep item chain of the partial view only. | |
2132 | ||
2133 | -- package Pack_1 is | |
2134 | -- type Root ... is private; | |
2135 | -- private | |
2136 | -- <full view of Root> | |
2137 | -- end Pack_1; | |
2138 | ||
2139 | -- with Pack_1; | |
2140 | -- package Pack_2 is | |
2141 | -- type Child is new Pack_1.Root with Type_DIC => ...; | |
2142 | -- <underlying full view of Child> | |
2143 | -- end Pack_2; | |
2144 | ||
2145 | -- As a result, the processing of the full view must also consider | |
2146 | -- all DICs of the partial view. | |
2147 | ||
2148 | if Is_Untagged_Private_Derivation (Priv_Typ, Full_Typ) then | |
2149 | null; | |
2150 | ||
2151 | -- Otherwise the DICs of the partial view are ignored | |
2152 | ||
2153 | else | |
2154 | -- Ignore the DICs of the partial view by eliminating the view | |
2155 | ||
2156 | Priv_Typ := Empty; | |
2157 | end if; | |
f63d601b | 2158 | end if; |
b619c88e | 2159 | |
f7937111 GD |
2160 | -- Process inherited Default_Initial_Conditions for all parent types |
2161 | ||
2162 | Add_Parent_DICs (Work_Typ, Obj_Id, Stmts); | |
f63d601b HK |
2163 | end if; |
2164 | ||
2165 | End_Scope; | |
2166 | ||
f7937111 GD |
2167 | -- Produce an empty completing body in the following cases: |
2168 | -- * Assertions are disabled | |
2169 | -- * The DIC Assertion_Policy is Ignore | |
f63d601b | 2170 | |
f7937111 GD |
2171 | if No (Stmts) then |
2172 | Stmts := New_List (Make_Null_Statement (Loc)); | |
2173 | end if; | |
b5360737 | 2174 | |
f7937111 GD |
2175 | -- Generate: |
2176 | -- procedure <Work_Typ>DIC (_object : <Work_Typ>) is | |
2177 | -- begin | |
2178 | -- <Stmts> | |
2179 | -- end <Work_Typ>DIC; | |
b619c88e | 2180 | |
f7937111 GD |
2181 | Proc_Body := |
2182 | Make_Subprogram_Body (Loc, | |
2183 | Specification => | |
2184 | Copy_Subprogram_Spec (Parent (Proc_Id)), | |
2185 | Declarations => Empty_List, | |
2186 | Handled_Statement_Sequence => | |
2187 | Make_Handled_Sequence_Of_Statements (Loc, | |
2188 | Statements => Stmts)); | |
2189 | Proc_Body_Id := Defining_Entity (Proc_Body); | |
f63d601b | 2190 | |
f7937111 | 2191 | -- Perform minor decoration in case the body is not analyzed |
5f325af2 | 2192 | |
f7937111 GD |
2193 | Set_Ekind (Proc_Body_Id, E_Subprogram_Body); |
2194 | Set_Etype (Proc_Body_Id, Standard_Void_Type); | |
2195 | Set_Scope (Proc_Body_Id, Current_Scope); | |
2196 | Set_SPARK_Pragma (Proc_Body_Id, SPARK_Pragma (Proc_Id)); | |
2197 | Set_SPARK_Pragma_Inherited | |
2198 | (Proc_Body_Id, SPARK_Pragma_Inherited (Proc_Id)); | |
5f325af2 | 2199 | |
f7937111 | 2200 | -- Link both spec and body to avoid generating duplicates |
f63d601b | 2201 | |
f7937111 GD |
2202 | Set_Corresponding_Body (Proc_Decl, Proc_Body_Id); |
2203 | Set_Corresponding_Spec (Proc_Body, Proc_Id); | |
2204 | ||
2205 | -- The body should not be inserted into the tree when the context | |
2206 | -- is a generic unit because it is not part of the template. | |
2207 | -- Note that the body must still be generated in order to resolve the | |
2208 | -- DIC assertion expression. | |
2209 | ||
2210 | if Inside_A_Generic then | |
2211 | null; | |
2212 | ||
2213 | -- Semi-insert the body into the tree for GNATprove by setting its | |
2214 | -- Parent field. This allows for proper upstream tree traversals. | |
2215 | ||
2216 | elsif GNATprove_Mode then | |
2217 | Set_Parent (Proc_Body, Parent (Declaration_Node (Work_Typ))); | |
2218 | ||
2219 | -- Otherwise the body is part of the freezing actions of the working | |
2220 | -- type. | |
2221 | ||
2222 | else | |
2223 | Append_Freeze_Action (Work_Typ, Proc_Body); | |
f63d601b HK |
2224 | end if; |
2225 | ||
d65a80fd | 2226 | <<Leave>> |
9057bd6a | 2227 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
f63d601b HK |
2228 | end Build_DIC_Procedure_Body; |
2229 | ||
2230 | ------------------------------------- | |
2231 | -- Build_DIC_Procedure_Declaration -- | |
2232 | ------------------------------------- | |
2233 | ||
b0bf18ad AC |
2234 | -- WARNING: This routine manages Ghost regions. Return statements must be |
2235 | -- replaced by gotos which jump to the end of the routine and restore the | |
2236 | -- Ghost mode. | |
2237 | ||
f7937111 GD |
2238 | procedure Build_DIC_Procedure_Declaration |
2239 | (Typ : Entity_Id; | |
2240 | Partial_DIC : Boolean := False) | |
2241 | is | |
f63d601b HK |
2242 | Loc : constant Source_Ptr := Sloc (Typ); |
2243 | ||
9057bd6a HK |
2244 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
2245 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
2246 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 | 2247 | |
f63d601b HK |
2248 | DIC_Prag : Node_Id; |
2249 | DIC_Typ : Entity_Id; | |
2250 | Proc_Decl : Node_Id; | |
2251 | Proc_Id : Entity_Id; | |
f7937111 | 2252 | Proc_Nam : Name_Id; |
f63d601b HK |
2253 | Typ_Decl : Node_Id; |
2254 | ||
2255 | CRec_Typ : Entity_Id; | |
2256 | -- The corresponding record type of Full_Typ | |
2257 | ||
f63d601b HK |
2258 | Full_Typ : Entity_Id; |
2259 | -- The full view of working type | |
2260 | ||
2261 | Obj_Id : Entity_Id; | |
2262 | -- The _object formal parameter of the DIC procedure | |
2263 | ||
2264 | Priv_Typ : Entity_Id; | |
2265 | -- The partial view of working type | |
2266 | ||
b97813ab EB |
2267 | UFull_Typ : Entity_Id; |
2268 | -- The underlying full view of Full_Typ | |
2269 | ||
f63d601b HK |
2270 | Work_Typ : Entity_Id; |
2271 | -- The working type | |
2272 | ||
2273 | begin | |
ce06d641 AC |
2274 | Work_Typ := Base_Type (Typ); |
2275 | ||
2276 | -- Do not process class-wide types as these are Itypes, but lack a first | |
2277 | -- subtype (see below). | |
2278 | ||
2279 | if Is_Class_Wide_Type (Work_Typ) then | |
2280 | return; | |
2281 | ||
2282 | -- Do not process the underlying full view of a private type. There is | |
2283 | -- no way to get back to the partial view, plus the body will be built | |
2284 | -- by the full view or the base type. | |
2285 | ||
2286 | elsif Is_Underlying_Full_View (Work_Typ) then | |
2287 | return; | |
f63d601b | 2288 | |
ce06d641 | 2289 | -- Use the first subtype when dealing with various base types |
f63d601b | 2290 | |
ce06d641 | 2291 | elsif Is_Itype (Work_Typ) then |
f63d601b HK |
2292 | Work_Typ := First_Subtype (Work_Typ); |
2293 | ||
2294 | -- The input denotes the corresponding record type of a protected or a | |
2295 | -- task type. Work with the concurrent type because the corresponding | |
2296 | -- record type may not be visible to clients of the type. | |
2297 | ||
2298 | elsif Ekind (Work_Typ) = E_Record_Type | |
2299 | and then Is_Concurrent_Record_Type (Work_Typ) | |
2300 | then | |
2301 | Work_Typ := Corresponding_Concurrent_Type (Work_Typ); | |
2302 | end if; | |
2303 | ||
d65a80fd HK |
2304 | -- The working type may be subject to pragma Ghost. Set the mode now to |
2305 | -- ensure that the DIC procedure is properly marked as Ghost. | |
2306 | ||
f9a8f910 | 2307 | Set_Ghost_Mode (Work_Typ); |
d65a80fd | 2308 | |
f63d601b HK |
2309 | -- The type must be either subject to a DIC pragma or inherit one from a |
2310 | -- parent type. | |
2311 | ||
2312 | pragma Assert (Has_DIC (Work_Typ)); | |
2313 | ||
2314 | -- Recover the type which defines the DIC pragma. This is either the | |
2315 | -- working type itself or a parent type when the pragma is inherited. | |
2316 | ||
2317 | DIC_Typ := Find_DIC_Type (Work_Typ); | |
2318 | pragma Assert (Present (DIC_Typ)); | |
2319 | ||
2320 | DIC_Prag := Get_Pragma (DIC_Typ, Pragma_Default_Initial_Condition); | |
2321 | pragma Assert (Present (DIC_Prag)); | |
2322 | ||
2323 | -- Nothing to do if pragma DIC appears without an argument or its sole | |
2324 | -- argument is "null". | |
2325 | ||
2326 | if not Is_Verifiable_DIC_Pragma (DIC_Prag) then | |
d65a80fd | 2327 | goto Leave; |
f7937111 GD |
2328 | end if; |
2329 | ||
2330 | -- Nothing to do if the type already has a "partial" DIC procedure | |
2331 | ||
2332 | if Partial_DIC then | |
2333 | if Present (Partial_DIC_Procedure (Work_Typ)) then | |
2334 | goto Leave; | |
2335 | end if; | |
f63d601b | 2336 | |
f7937111 | 2337 | -- Nothing to do if the type already has a "full" DIC procedure |
f63d601b HK |
2338 | |
2339 | elsif Present (DIC_Procedure (Work_Typ)) then | |
d65a80fd | 2340 | goto Leave; |
f63d601b HK |
2341 | end if; |
2342 | ||
f7937111 GD |
2343 | -- The caller requests the declaration of the "partial" DIC procedure |
2344 | ||
2345 | if Partial_DIC then | |
2346 | Proc_Nam := New_External_Name (Chars (Work_Typ), "Partial_DIC"); | |
2347 | ||
2348 | -- Otherwise the caller requests the declaration of the "full" DIC | |
2349 | -- procedure. | |
2350 | ||
2351 | else | |
2352 | Proc_Nam := New_External_Name (Chars (Work_Typ), "DIC"); | |
2353 | end if; | |
2354 | ||
f63d601b | 2355 | Proc_Id := |
f7937111 | 2356 | Make_Defining_Identifier (Loc, Chars => Proc_Nam); |
f63d601b HK |
2357 | |
2358 | -- Perform minor decoration in case the declaration is not analyzed | |
2359 | ||
90e491a7 PMR |
2360 | Set_Ekind (Proc_Id, E_Procedure); |
2361 | Set_Etype (Proc_Id, Standard_Void_Type); | |
2362 | Set_Is_DIC_Procedure (Proc_Id); | |
2363 | Set_Scope (Proc_Id, Current_Scope); | |
2364 | Set_SPARK_Pragma (Proc_Id, SPARK_Mode_Pragma); | |
2365 | Set_SPARK_Pragma_Inherited (Proc_Id); | |
f63d601b | 2366 | |
f63d601b HK |
2367 | Set_DIC_Procedure (Work_Typ, Proc_Id); |
2368 | ||
2369 | -- The DIC procedure requires debug info when the assertion expression | |
2370 | -- is subject to Source Coverage Obligations. | |
2371 | ||
90e491a7 | 2372 | if Generate_SCO then |
923ecd0e | 2373 | Set_Debug_Info_Needed (Proc_Id); |
f63d601b HK |
2374 | end if; |
2375 | ||
f63d601b HK |
2376 | -- Obtain all views of the input type |
2377 | ||
b97813ab | 2378 | Get_Views (Work_Typ, Priv_Typ, Full_Typ, UFull_Typ, CRec_Typ); |
f63d601b | 2379 | |
b97813ab | 2380 | -- Associate the DIC procedure and various flags with all views |
f63d601b HK |
2381 | |
2382 | Propagate_DIC_Attributes (Priv_Typ, From_Typ => Work_Typ); | |
2383 | Propagate_DIC_Attributes (Full_Typ, From_Typ => Work_Typ); | |
b97813ab | 2384 | Propagate_DIC_Attributes (UFull_Typ, From_Typ => Work_Typ); |
f63d601b HK |
2385 | Propagate_DIC_Attributes (CRec_Typ, From_Typ => Work_Typ); |
2386 | ||
2387 | -- The declaration of the DIC procedure must be inserted after the | |
2388 | -- declaration of the partial view as this allows for proper external | |
2389 | -- visibility. | |
2390 | ||
2391 | if Present (Priv_Typ) then | |
2392 | Typ_Decl := Declaration_Node (Priv_Typ); | |
2393 | ||
2394 | -- Derived types with the full view as parent do not have a partial | |
2395 | -- view. Insert the DIC procedure after the derived type. | |
2396 | ||
2397 | else | |
2398 | Typ_Decl := Declaration_Node (Full_Typ); | |
2399 | end if; | |
2400 | ||
2401 | -- The type should have a declarative node | |
2402 | ||
2403 | pragma Assert (Present (Typ_Decl)); | |
2404 | ||
2405 | -- Create the formal parameter which emulates the variable-like behavior | |
e51102b2 | 2406 | -- of the type's current instance. |
f63d601b HK |
2407 | |
2408 | Obj_Id := Make_Defining_Identifier (Loc, Chars => Name_uObject); | |
2409 | ||
2410 | -- Perform minor decoration in case the declaration is not analyzed | |
2411 | ||
2412 | Set_Ekind (Obj_Id, E_In_Parameter); | |
2413 | Set_Etype (Obj_Id, Work_Typ); | |
2414 | Set_Scope (Obj_Id, Proc_Id); | |
2415 | ||
2416 | Set_First_Entity (Proc_Id, Obj_Id); | |
aa090e20 | 2417 | Set_Last_Entity (Proc_Id, Obj_Id); |
f63d601b HK |
2418 | |
2419 | -- Generate: | |
2420 | -- procedure <Work_Typ>DIC (_object : <Work_Typ>); | |
2421 | ||
2422 | Proc_Decl := | |
2423 | Make_Subprogram_Declaration (Loc, | |
2424 | Specification => | |
2425 | Make_Procedure_Specification (Loc, | |
2426 | Defining_Unit_Name => Proc_Id, | |
2427 | Parameter_Specifications => New_List ( | |
2428 | Make_Parameter_Specification (Loc, | |
2429 | Defining_Identifier => Obj_Id, | |
2430 | Parameter_Type => | |
2431 | New_Occurrence_Of (Work_Typ, Loc))))); | |
2432 | ||
2433 | -- The declaration should not be inserted into the tree when the context | |
65f1ca2e | 2434 | -- is a generic unit because it is not part of the template. |
f63d601b | 2435 | |
65f1ca2e | 2436 | if Inside_A_Generic then |
f63d601b HK |
2437 | null; |
2438 | ||
5f325af2 AC |
2439 | -- Semi-insert the declaration into the tree for GNATprove by setting |
2440 | -- its Parent field. This allows for proper upstream tree traversals. | |
2441 | ||
2442 | elsif GNATprove_Mode then | |
2443 | Set_Parent (Proc_Decl, Parent (Typ_Decl)); | |
2444 | ||
f63d601b HK |
2445 | -- Otherwise insert the declaration |
2446 | ||
2447 | else | |
f63d601b HK |
2448 | Insert_After_And_Analyze (Typ_Decl, Proc_Decl); |
2449 | end if; | |
2450 | ||
d65a80fd | 2451 | <<Leave>> |
9057bd6a | 2452 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
f63d601b HK |
2453 | end Build_DIC_Procedure_Declaration; |
2454 | ||
51148dda AC |
2455 | ------------------------------------ |
2456 | -- Build_Invariant_Procedure_Body -- | |
2457 | ------------------------------------ | |
2458 | ||
2459 | -- WARNING: This routine manages Ghost regions. Return statements must be | |
2460 | -- replaced by gotos which jump to the end of the routine and restore the | |
2461 | -- Ghost mode. | |
2462 | ||
2463 | procedure Build_Invariant_Procedure_Body | |
2464 | (Typ : Entity_Id; | |
2465 | Partial_Invariant : Boolean := False) | |
2466 | is | |
2467 | Loc : constant Source_Ptr := Sloc (Typ); | |
2468 | ||
2469 | Pragmas_Seen : Elist_Id := No_Elist; | |
2470 | -- This list contains all invariant pragmas processed so far. The list | |
2471 | -- is used to avoid generating redundant invariant checks. | |
2472 | ||
2473 | Produced_Check : Boolean := False; | |
2474 | -- This flag tracks whether the type has produced at least one invariant | |
2475 | -- check. The flag is used as a sanity check at the end of the routine. | |
2476 | ||
2477 | -- NOTE: most of the routines in Build_Invariant_Procedure_Body are | |
2478 | -- intentionally unnested to avoid deep indentation of code. | |
2479 | ||
2480 | -- NOTE: all Add_xxx_Invariants routines are reactive. In other words | |
2481 | -- they emit checks, loops (for arrays) and case statements (for record | |
2482 | -- variant parts) only when there are invariants to verify. This keeps | |
b554177a | 2483 | -- the body of the invariant procedure free of useless code. |
51148dda AC |
2484 | |
2485 | procedure Add_Array_Component_Invariants | |
2486 | (T : Entity_Id; | |
2487 | Obj_Id : Entity_Id; | |
2488 | Checks : in out List_Id); | |
2489 | -- Generate an invariant check for each component of array type T. | |
2490 | -- Obj_Id denotes the entity of the _object formal parameter of the | |
2491 | -- invariant procedure. All created checks are added to list Checks. | |
2492 | ||
003d46d5 | 2493 | procedure Add_Inherited_Invariants |
b554177a AC |
2494 | (T : Entity_Id; |
2495 | Priv_Typ : Entity_Id; | |
2496 | Full_Typ : Entity_Id; | |
2497 | Obj_Id : Entity_Id; | |
2498 | Checks : in out List_Id); | |
ded462b0 | 2499 | -- Generate an invariant check for each inherited class-wide invariant |
b554177a AC |
2500 | -- coming from all parent types of type T. Priv_Typ and Full_Typ denote |
2501 | -- the partial and full view of the parent type. Obj_Id denotes the | |
2502 | -- entity of the _object formal parameter of the invariant procedure. | |
2503 | -- All created checks are added to list Checks. | |
ded462b0 AC |
2504 | |
2505 | procedure Add_Interface_Invariants | |
2506 | (T : Entity_Id; | |
2507 | Obj_Id : Entity_Id; | |
2508 | Checks : in out List_Id); | |
2509 | -- Generate an invariant check for each inherited class-wide invariant | |
2510 | -- coming from all interfaces implemented by type T. Obj_Id denotes the | |
2511 | -- entity of the _object formal parameter of the invariant procedure. | |
2512 | -- All created checks are added to list Checks. | |
2513 | ||
998429d6 AC |
2514 | procedure Add_Invariant_Check |
2515 | (Prag : Node_Id; | |
2516 | Expr : Node_Id; | |
2517 | Checks : in out List_Id; | |
2518 | Inherited : Boolean := False); | |
2519 | -- Subsidiary to all Add_xxx_Invariant routines. Add a runtime check to | |
2520 | -- verify assertion expression Expr of pragma Prag. All generated code | |
2521 | -- is added to list Checks. Flag Inherited should be set when the pragma | |
2522 | -- is inherited from a parent or interface type. | |
51148dda | 2523 | |
003d46d5 | 2524 | procedure Add_Own_Invariants |
998429d6 AC |
2525 | (T : Entity_Id; |
2526 | Obj_Id : Entity_Id; | |
2527 | Checks : in out List_Id; | |
2528 | Priv_Item : Node_Id := Empty); | |
2529 | -- Generate an invariant check for each invariant found for type T. | |
2530 | -- Obj_Id denotes the entity of the _object formal parameter of the | |
2531 | -- invariant procedure. All created checks are added to list Checks. | |
2532 | -- Priv_Item denotes the first rep item of the private type. | |
2533 | ||
ded462b0 AC |
2534 | procedure Add_Parent_Invariants |
2535 | (T : Entity_Id; | |
2536 | Obj_Id : Entity_Id; | |
2537 | Checks : in out List_Id); | |
2538 | -- Generate an invariant check for each inherited class-wide invariant | |
2539 | -- coming from all parent types of type T. Obj_Id denotes the entity of | |
2540 | -- the _object formal parameter of the invariant procedure. All created | |
2541 | -- checks are added to list Checks. | |
2542 | ||
51148dda AC |
2543 | procedure Add_Record_Component_Invariants |
2544 | (T : Entity_Id; | |
2545 | Obj_Id : Entity_Id; | |
2546 | Checks : in out List_Id); | |
2547 | -- Generate an invariant check for each component of record type T. | |
2548 | -- Obj_Id denotes the entity of the _object formal parameter of the | |
2549 | -- invariant procedure. All created checks are added to list Checks. | |
2550 | ||
51148dda AC |
2551 | ------------------------------------ |
2552 | -- Add_Array_Component_Invariants -- | |
2553 | ------------------------------------ | |
2554 | ||
2555 | procedure Add_Array_Component_Invariants | |
2556 | (T : Entity_Id; | |
2557 | Obj_Id : Entity_Id; | |
2558 | Checks : in out List_Id) | |
2559 | is | |
2560 | Comp_Typ : constant Entity_Id := Component_Type (T); | |
2561 | Dims : constant Pos := Number_Dimensions (T); | |
2562 | ||
2563 | procedure Process_Array_Component | |
2564 | (Indices : List_Id; | |
2565 | Comp_Checks : in out List_Id); | |
2566 | -- Generate an invariant check for an array component identified by | |
2567 | -- the indices in list Indices. All created checks are added to list | |
2568 | -- Comp_Checks. | |
2569 | ||
2570 | procedure Process_One_Dimension | |
2571 | (Dim : Pos; | |
2572 | Indices : List_Id; | |
2573 | Dim_Checks : in out List_Id); | |
2574 | -- Generate a loop over the Nth dimension Dim of an array type. List | |
2575 | -- Indices contains all array indices for the dimension. All created | |
2576 | -- checks are added to list Dim_Checks. | |
2577 | ||
2578 | ----------------------------- | |
2579 | -- Process_Array_Component -- | |
2580 | ----------------------------- | |
2581 | ||
2582 | procedure Process_Array_Component | |
2583 | (Indices : List_Id; | |
2584 | Comp_Checks : in out List_Id) | |
2585 | is | |
2586 | Proc_Id : Entity_Id; | |
2587 | ||
2588 | begin | |
2589 | if Has_Invariants (Comp_Typ) then | |
2590 | ||
2591 | -- In GNATprove mode, the component invariants are checked by | |
2592 | -- other means. They should not be added to the array type | |
2593 | -- invariant procedure, so that the procedure can be used to | |
2594 | -- check the array type invariants if any. | |
2595 | ||
2596 | if GNATprove_Mode then | |
2597 | null; | |
2598 | ||
2599 | else | |
2600 | Proc_Id := Invariant_Procedure (Base_Type (Comp_Typ)); | |
2601 | ||
2602 | -- The component type should have an invariant procedure | |
2603 | -- if it has invariants of its own or inherits class-wide | |
2604 | -- invariants from parent or interface types. | |
2605 | ||
2606 | pragma Assert (Present (Proc_Id)); | |
2607 | ||
2608 | -- Generate: | |
2609 | -- <Comp_Typ>Invariant (_object (<Indices>)); | |
2610 | ||
b9daf13c BD |
2611 | -- The invariant procedure has a null body if assertions are |
2612 | -- disabled or Assertion_Policy Ignore is in effect. | |
51148dda AC |
2613 | |
2614 | if not Has_Null_Body (Proc_Id) then | |
2615 | Append_New_To (Comp_Checks, | |
2616 | Make_Procedure_Call_Statement (Loc, | |
2617 | Name => | |
2618 | New_Occurrence_Of (Proc_Id, Loc), | |
2619 | Parameter_Associations => New_List ( | |
2620 | Make_Indexed_Component (Loc, | |
2621 | Prefix => New_Occurrence_Of (Obj_Id, Loc), | |
2622 | Expressions => New_Copy_List (Indices))))); | |
2623 | end if; | |
2624 | end if; | |
2625 | ||
2626 | Produced_Check := True; | |
2627 | end if; | |
2628 | end Process_Array_Component; | |
2629 | ||
2630 | --------------------------- | |
2631 | -- Process_One_Dimension -- | |
2632 | --------------------------- | |
2633 | ||
2634 | procedure Process_One_Dimension | |
2635 | (Dim : Pos; | |
2636 | Indices : List_Id; | |
2637 | Dim_Checks : in out List_Id) | |
2638 | is | |
2639 | Comp_Checks : List_Id := No_List; | |
2640 | Index : Entity_Id; | |
2641 | ||
2642 | begin | |
2643 | -- Generate the invariant checks for the array component after all | |
2644 | -- dimensions have produced their respective loops. | |
2645 | ||
2646 | if Dim > Dims then | |
2647 | Process_Array_Component | |
2648 | (Indices => Indices, | |
2649 | Comp_Checks => Dim_Checks); | |
2650 | ||
2651 | -- Otherwise create a loop for the current dimension | |
2652 | ||
2653 | else | |
2654 | -- Create a new loop variable for each dimension | |
2655 | ||
2656 | Index := | |
2657 | Make_Defining_Identifier (Loc, | |
2658 | Chars => New_External_Name ('I', Dim)); | |
2659 | Append_To (Indices, New_Occurrence_Of (Index, Loc)); | |
2660 | ||
2661 | Process_One_Dimension | |
2662 | (Dim => Dim + 1, | |
2663 | Indices => Indices, | |
2664 | Dim_Checks => Comp_Checks); | |
2665 | ||
2666 | -- Generate: | |
2667 | -- for I<Dim> in _object'Range (<Dim>) loop | |
2668 | -- <Comp_Checks> | |
2669 | -- end loop; | |
2670 | ||
2671 | -- Note that the invariant procedure may have a null body if | |
2672 | -- assertions are disabled or Assertion_Policy Ignore is in | |
2673 | -- effect. | |
2674 | ||
2675 | if Present (Comp_Checks) then | |
2676 | Append_New_To (Dim_Checks, | |
2677 | Make_Implicit_Loop_Statement (T, | |
2678 | Identifier => Empty, | |
2679 | Iteration_Scheme => | |
2680 | Make_Iteration_Scheme (Loc, | |
2681 | Loop_Parameter_Specification => | |
2682 | Make_Loop_Parameter_Specification (Loc, | |
2683 | Defining_Identifier => Index, | |
2684 | Discrete_Subtype_Definition => | |
2685 | Make_Attribute_Reference (Loc, | |
2686 | Prefix => | |
2687 | New_Occurrence_Of (Obj_Id, Loc), | |
2688 | Attribute_Name => Name_Range, | |
2689 | Expressions => New_List ( | |
2690 | Make_Integer_Literal (Loc, Dim))))), | |
998429d6 | 2691 | Statements => Comp_Checks)); |
51148dda AC |
2692 | end if; |
2693 | end if; | |
2694 | end Process_One_Dimension; | |
2695 | ||
2696 | -- Start of processing for Add_Array_Component_Invariants | |
2697 | ||
2698 | begin | |
2699 | Process_One_Dimension | |
2700 | (Dim => 1, | |
2701 | Indices => New_List, | |
2702 | Dim_Checks => Checks); | |
2703 | end Add_Array_Component_Invariants; | |
2704 | ||
003d46d5 AC |
2705 | ------------------------------ |
2706 | -- Add_Inherited_Invariants -- | |
2707 | ------------------------------ | |
51148dda | 2708 | |
003d46d5 | 2709 | procedure Add_Inherited_Invariants |
b554177a AC |
2710 | (T : Entity_Id; |
2711 | Priv_Typ : Entity_Id; | |
2712 | Full_Typ : Entity_Id; | |
2713 | Obj_Id : Entity_Id; | |
2714 | Checks : in out List_Id) | |
51148dda | 2715 | is |
b554177a AC |
2716 | Deriv_Typ : Entity_Id; |
2717 | Expr : Node_Id; | |
2718 | Prag : Node_Id; | |
2719 | Prag_Expr : Node_Id; | |
2720 | Prag_Expr_Arg : Node_Id; | |
2721 | Prag_Typ : Node_Id; | |
2722 | Prag_Typ_Arg : Node_Id; | |
2723 | ||
2724 | Par_Proc : Entity_Id; | |
2725 | -- The "partial" invariant procedure of Par_Typ | |
998429d6 | 2726 | |
b554177a AC |
2727 | Par_Typ : Entity_Id; |
2728 | -- The suitable view of the parent type used in the substitution of | |
2729 | -- type attributes. | |
51148dda AC |
2730 | |
2731 | begin | |
ded462b0 | 2732 | if not Present (Priv_Typ) and then not Present (Full_Typ) then |
998429d6 AC |
2733 | return; |
2734 | end if; | |
51148dda | 2735 | |
5f8d3dd5 AC |
2736 | -- When the type inheriting the class-wide invariant is a concurrent |
2737 | -- type, use the corresponding record type because it contains all | |
ca0b6141 | 2738 | -- primitive operations of the concurrent type and allows for proper |
5f8d3dd5 AC |
2739 | -- substitution. |
2740 | ||
2741 | if Is_Concurrent_Type (T) then | |
2742 | Deriv_Typ := Corresponding_Record_Type (T); | |
2743 | else | |
2744 | Deriv_Typ := T; | |
2745 | end if; | |
2746 | ||
a8531f71 | 2747 | pragma Assert (Present (Deriv_Typ)); |
5f8d3dd5 | 2748 | |
b554177a AC |
2749 | -- Determine which rep item chain to use. Precedence is given to that |
2750 | -- of the parent type's partial view since it usually carries all the | |
2751 | -- class-wide invariants. | |
2752 | ||
ded462b0 AC |
2753 | if Present (Priv_Typ) then |
2754 | Prag := First_Rep_Item (Priv_Typ); | |
2755 | else | |
2756 | Prag := First_Rep_Item (Full_Typ); | |
2757 | end if; | |
2758 | ||
998429d6 AC |
2759 | while Present (Prag) loop |
2760 | if Nkind (Prag) = N_Pragma | |
2761 | and then Pragma_Name (Prag) = Name_Invariant | |
2762 | then | |
2763 | -- Nothing to do if the pragma was already processed | |
51148dda | 2764 | |
998429d6 AC |
2765 | if Contains (Pragmas_Seen, Prag) then |
2766 | return; | |
b554177a AC |
2767 | |
2768 | -- Nothing to do when the caller requests the processing of all | |
2769 | -- inherited class-wide invariants, but the pragma does not | |
2770 | -- fall in this category. | |
2771 | ||
2772 | elsif not Class_Present (Prag) then | |
2773 | return; | |
998429d6 | 2774 | end if; |
51148dda | 2775 | |
998429d6 | 2776 | -- Extract the arguments of the invariant pragma |
51148dda | 2777 | |
b554177a AC |
2778 | Prag_Typ_Arg := First (Pragma_Argument_Associations (Prag)); |
2779 | Prag_Expr_Arg := Next (Prag_Typ_Arg); | |
2780 | Prag_Expr := Expression_Copy (Prag_Expr_Arg); | |
2781 | Prag_Typ := Get_Pragma_Arg (Prag_Typ_Arg); | |
ded462b0 | 2782 | |
b554177a | 2783 | -- The pragma applies to the partial view of the parent type |
ded462b0 | 2784 | |
b554177a AC |
2785 | if Present (Priv_Typ) |
2786 | and then Entity (Prag_Typ) = Priv_Typ | |
2787 | then | |
2788 | Par_Typ := Priv_Typ; | |
ded462b0 | 2789 | |
b554177a | 2790 | -- The pragma applies to the full view of the parent type |
ded462b0 | 2791 | |
b554177a AC |
2792 | elsif Present (Full_Typ) |
2793 | and then Entity (Prag_Typ) = Full_Typ | |
2794 | then | |
2795 | Par_Typ := Full_Typ; | |
998429d6 | 2796 | |
b554177a AC |
2797 | -- Otherwise the pragma does not belong to the parent type and |
2798 | -- should not be considered. | |
51148dda | 2799 | |
998429d6 AC |
2800 | else |
2801 | return; | |
2802 | end if; | |
51148dda | 2803 | |
b554177a | 2804 | -- Perform the following substitutions: |
998429d6 | 2805 | |
b554177a AC |
2806 | -- * Replace a reference to the _object parameter of the |
2807 | -- parent type's partial invariant procedure with a | |
2808 | -- reference to the _object parameter of the derived | |
2809 | -- type's full invariant procedure. | |
2810 | ||
2811 | -- * Replace a reference to a discriminant of the parent type | |
2812 | -- with a suitable value from the point of view of the | |
2813 | -- derived type. | |
2814 | ||
2815 | -- * Replace a call to an overridden parent primitive with a | |
2816 | -- call to the overriding derived type primitive. | |
2817 | ||
2818 | -- * Replace a call to an inherited parent primitive with a | |
2819 | -- call to the internally-generated inherited derived type | |
2820 | -- primitive. | |
2821 | ||
2822 | Expr := New_Copy_Tree (Prag_Expr); | |
2823 | ||
b554177a AC |
2824 | -- The parent type must have a "partial" invariant procedure |
2825 | -- because class-wide invariants are captured exclusively by | |
2826 | -- it. | |
998429d6 | 2827 | |
b554177a AC |
2828 | Par_Proc := Partial_Invariant_Procedure (Par_Typ); |
2829 | pragma Assert (Present (Par_Proc)); | |
998429d6 | 2830 | |
b554177a AC |
2831 | Replace_References |
2832 | (Expr => Expr, | |
2833 | Par_Typ => Par_Typ, | |
2834 | Deriv_Typ => Deriv_Typ, | |
2835 | Par_Obj => First_Formal (Par_Proc), | |
2836 | Deriv_Obj => Obj_Id); | |
998429d6 AC |
2837 | |
2838 | Add_Invariant_Check (Prag, Expr, Checks, Inherited => True); | |
2839 | end if; | |
2840 | ||
2841 | Next_Rep_Item (Prag); | |
2842 | end loop; | |
003d46d5 | 2843 | end Add_Inherited_Invariants; |
998429d6 | 2844 | |
ded462b0 AC |
2845 | ------------------------------ |
2846 | -- Add_Interface_Invariants -- | |
2847 | ------------------------------ | |
2848 | ||
2849 | procedure Add_Interface_Invariants | |
2850 | (T : Entity_Id; | |
2851 | Obj_Id : Entity_Id; | |
2852 | Checks : in out List_Id) | |
2853 | is | |
2854 | Iface_Elmt : Elmt_Id; | |
2855 | Ifaces : Elist_Id; | |
2856 | ||
2857 | begin | |
003d46d5 AC |
2858 | -- Generate an invariant check for each class-wide invariant coming |
2859 | -- from all interfaces implemented by type T. | |
ded462b0 AC |
2860 | |
2861 | if Is_Tagged_Type (T) then | |
2862 | Collect_Interfaces (T, Ifaces); | |
2863 | ||
2864 | -- Process the class-wide invariants of all implemented interfaces | |
2865 | ||
2866 | Iface_Elmt := First_Elmt (Ifaces); | |
2867 | while Present (Iface_Elmt) loop | |
b554177a AC |
2868 | |
2869 | -- The Full_Typ parameter is intentionally left Empty because | |
2870 | -- interfaces are treated as the partial view of a private type | |
2871 | -- in order to achieve uniformity with the general case. | |
2872 | ||
003d46d5 | 2873 | Add_Inherited_Invariants |
b554177a AC |
2874 | (T => T, |
2875 | Priv_Typ => Node (Iface_Elmt), | |
2876 | Full_Typ => Empty, | |
2877 | Obj_Id => Obj_Id, | |
2878 | Checks => Checks); | |
ded462b0 AC |
2879 | |
2880 | Next_Elmt (Iface_Elmt); | |
2881 | end loop; | |
2882 | end if; | |
2883 | end Add_Interface_Invariants; | |
2884 | ||
998429d6 AC |
2885 | ------------------------- |
2886 | -- Add_Invariant_Check -- | |
2887 | ------------------------- | |
2888 | ||
2889 | procedure Add_Invariant_Check | |
2890 | (Prag : Node_Id; | |
2891 | Expr : Node_Id; | |
2892 | Checks : in out List_Id; | |
2893 | Inherited : Boolean := False) | |
2894 | is | |
2895 | Args : constant List_Id := Pragma_Argument_Associations (Prag); | |
2896 | Nam : constant Name_Id := Original_Aspect_Pragma_Name (Prag); | |
2897 | Ploc : constant Source_Ptr := Sloc (Prag); | |
2898 | Str_Arg : constant Node_Id := Next (Next (First (Args))); | |
2899 | ||
2900 | Assoc : List_Id; | |
2901 | Str : String_Id; | |
51148dda AC |
2902 | |
2903 | begin | |
998429d6 AC |
2904 | -- The invariant is ignored, nothing left to do |
2905 | ||
2906 | if Is_Ignored (Prag) then | |
2907 | null; | |
2908 | ||
b554177a | 2909 | -- Otherwise the invariant is checked. Build a pragma Check to verify |
ca0b6141 | 2910 | -- the expression at run time. |
998429d6 AC |
2911 | |
2912 | else | |
2913 | Assoc := New_List ( | |
2914 | Make_Pragma_Argument_Association (Ploc, | |
2915 | Expression => Make_Identifier (Ploc, Nam)), | |
2916 | Make_Pragma_Argument_Association (Ploc, | |
2917 | Expression => Expr)); | |
2918 | ||
2919 | -- Handle the String argument (if any) | |
2920 | ||
2921 | if Present (Str_Arg) then | |
2922 | Str := Strval (Get_Pragma_Arg (Str_Arg)); | |
2923 | ||
2924 | -- When inheriting an invariant, modify the message from | |
2925 | -- "failed invariant" to "failed inherited invariant". | |
2926 | ||
2927 | if Inherited then | |
2928 | String_To_Name_Buffer (Str); | |
2929 | ||
2930 | if Name_Buffer (1 .. 16) = "failed invariant" then | |
2931 | Insert_Str_In_Name_Buffer ("inherited ", 8); | |
2932 | Str := String_From_Name_Buffer; | |
2933 | end if; | |
2934 | end if; | |
2935 | ||
2936 | Append_To (Assoc, | |
2937 | Make_Pragma_Argument_Association (Ploc, | |
2938 | Expression => Make_String_Literal (Ploc, Str))); | |
2939 | end if; | |
2940 | ||
2941 | -- Generate: | |
2942 | -- pragma Check (<Nam>, <Expr>, <Str>); | |
2943 | ||
2944 | Append_New_To (Checks, | |
2945 | Make_Pragma (Ploc, | |
2946 | Chars => Name_Check, | |
2947 | Pragma_Argument_Associations => Assoc)); | |
2948 | end if; | |
2949 | ||
2950 | -- Output an info message when inheriting an invariant and the | |
2951 | -- listing option is enabled. | |
2952 | ||
2953 | if Inherited and Opt.List_Inherited_Aspects then | |
2954 | Error_Msg_Sloc := Sloc (Prag); | |
2955 | Error_Msg_N | |
2956 | ("info: & inherits `Invariant''Class` aspect from #?L?", Typ); | |
2957 | end if; | |
2958 | ||
2959 | -- Add the pragma to the list of processed pragmas | |
2960 | ||
2961 | Append_New_Elmt (Prag, Pragmas_Seen); | |
2962 | Produced_Check := True; | |
2963 | end Add_Invariant_Check; | |
2964 | ||
ded462b0 AC |
2965 | --------------------------- |
2966 | -- Add_Parent_Invariants -- | |
2967 | --------------------------- | |
2968 | ||
2969 | procedure Add_Parent_Invariants | |
2970 | (T : Entity_Id; | |
2971 | Obj_Id : Entity_Id; | |
2972 | Checks : in out List_Id) | |
2973 | is | |
2974 | Dummy_1 : Entity_Id; | |
2975 | Dummy_2 : Entity_Id; | |
2976 | ||
2977 | Curr_Typ : Entity_Id; | |
2978 | -- The entity of the current type being examined | |
2979 | ||
2980 | Full_Typ : Entity_Id; | |
2981 | -- The full view of Par_Typ | |
2982 | ||
2983 | Par_Typ : Entity_Id; | |
2984 | -- The entity of the parent type | |
2985 | ||
2986 | Priv_Typ : Entity_Id; | |
2987 | -- The partial view of Par_Typ | |
2988 | ||
2989 | begin | |
2990 | -- Do not process array types because they cannot have true parent | |
2991 | -- types. This also prevents the generation of a duplicate invariant | |
2992 | -- check when the input type is an array base type because its Etype | |
2993 | -- denotes the first subtype, both of which share the same component | |
2994 | -- type. | |
2995 | ||
2996 | if Is_Array_Type (T) then | |
2997 | return; | |
2998 | end if; | |
2999 | ||
3000 | -- Climb the parent type chain | |
3001 | ||
3002 | Curr_Typ := T; | |
3003 | loop | |
3004 | -- Do not consider subtypes as they inherit the invariants | |
3005 | -- from their base types. | |
3006 | ||
3007 | Par_Typ := Base_Type (Etype (Curr_Typ)); | |
3008 | ||
3009 | -- Stop the climb once the root of the parent chain is | |
3010 | -- reached. | |
3011 | ||
3012 | exit when Curr_Typ = Par_Typ; | |
3013 | ||
3014 | -- Process the class-wide invariants of the parent type | |
3015 | ||
3016 | Get_Views (Par_Typ, Priv_Typ, Full_Typ, Dummy_1, Dummy_2); | |
3017 | ||
3018 | -- Process the elements of an array type | |
3019 | ||
3020 | if Is_Array_Type (Full_Typ) then | |
3021 | Add_Array_Component_Invariants (Full_Typ, Obj_Id, Checks); | |
3022 | ||
3023 | -- Process the components of a record type | |
3024 | ||
3025 | elsif Ekind (Full_Typ) = E_Record_Type then | |
3026 | Add_Record_Component_Invariants (Full_Typ, Obj_Id, Checks); | |
3027 | end if; | |
3028 | ||
003d46d5 | 3029 | Add_Inherited_Invariants |
b554177a AC |
3030 | (T => T, |
3031 | Priv_Typ => Priv_Typ, | |
3032 | Full_Typ => Full_Typ, | |
3033 | Obj_Id => Obj_Id, | |
3034 | Checks => Checks); | |
ded462b0 AC |
3035 | |
3036 | Curr_Typ := Par_Typ; | |
3037 | end loop; | |
3038 | end Add_Parent_Invariants; | |
3039 | ||
003d46d5 AC |
3040 | ------------------------ |
3041 | -- Add_Own_Invariants -- | |
3042 | ------------------------ | |
998429d6 | 3043 | |
003d46d5 | 3044 | procedure Add_Own_Invariants |
998429d6 AC |
3045 | (T : Entity_Id; |
3046 | Obj_Id : Entity_Id; | |
3047 | Checks : in out List_Id; | |
3048 | Priv_Item : Node_Id := Empty) | |
3049 | is | |
b554177a AC |
3050 | Expr : Node_Id; |
3051 | Prag : Node_Id; | |
3052 | Prag_Asp : Node_Id; | |
3053 | Prag_Expr : Node_Id; | |
3054 | Prag_Expr_Arg : Node_Id; | |
3055 | Prag_Typ : Node_Id; | |
3056 | Prag_Typ_Arg : Node_Id; | |
51148dda | 3057 | |
998429d6 AC |
3058 | begin |
3059 | if not Present (T) then | |
51148dda AC |
3060 | return; |
3061 | end if; | |
3062 | ||
998429d6 AC |
3063 | Prag := First_Rep_Item (T); |
3064 | while Present (Prag) loop | |
3065 | if Nkind (Prag) = N_Pragma | |
3066 | and then Pragma_Name (Prag) = Name_Invariant | |
3067 | then | |
3068 | -- Stop the traversal of the rep item chain once a specific | |
3069 | -- item is encountered. | |
51148dda | 3070 | |
998429d6 AC |
3071 | if Present (Priv_Item) and then Prag = Priv_Item then |
3072 | exit; | |
3073 | end if; | |
3074 | ||
3075 | -- Nothing to do if the pragma was already processed | |
3076 | ||
3077 | if Contains (Pragmas_Seen, Prag) then | |
3078 | return; | |
3079 | end if; | |
3080 | ||
3081 | -- Extract the arguments of the invariant pragma | |
3082 | ||
b554177a AC |
3083 | Prag_Typ_Arg := First (Pragma_Argument_Associations (Prag)); |
3084 | Prag_Expr_Arg := Next (Prag_Typ_Arg); | |
3085 | Prag_Expr := Get_Pragma_Arg (Prag_Expr_Arg); | |
3086 | Prag_Typ := Get_Pragma_Arg (Prag_Typ_Arg); | |
3087 | Prag_Asp := Corresponding_Aspect (Prag); | |
998429d6 | 3088 | |
ded462b0 | 3089 | -- Verify the pragma belongs to T, otherwise the pragma applies |
003d46d5 AC |
3090 | -- to a parent type in which case it will be processed later by |
3091 | -- Add_Parent_Invariants or Add_Interface_Invariants. | |
998429d6 | 3092 | |
b554177a | 3093 | if Entity (Prag_Typ) /= T then |
998429d6 AC |
3094 | return; |
3095 | end if; | |
3096 | ||
b554177a | 3097 | Expr := New_Copy_Tree (Prag_Expr); |
998429d6 | 3098 | |
003d46d5 AC |
3099 | -- Substitute all references to type T with references to the |
3100 | -- _object formal parameter. | |
998429d6 | 3101 | |
b554177a | 3102 | Replace_Type_References (Expr, T, Obj_Id); |
998429d6 AC |
3103 | |
3104 | -- Preanalyze the invariant expression to detect errors and at | |
3105 | -- the same time capture the visibility of the proper package | |
3106 | -- part. | |
51148dda | 3107 | |
b554177a | 3108 | Set_Parent (Expr, Parent (Prag_Expr)); |
998429d6 | 3109 | Preanalyze_Assert_Expression (Expr, Any_Boolean); |
51148dda | 3110 | |
b554177a AC |
3111 | -- Save a copy of the expression when T is tagged to detect |
3112 | -- errors and capture the visibility of the proper package part | |
3113 | -- for the generation of inherited type invariants. | |
3114 | ||
3115 | if Is_Tagged_Type (T) then | |
3116 | Set_Expression_Copy (Prag_Expr_Arg, New_Copy_Tree (Expr)); | |
3117 | end if; | |
3118 | ||
998429d6 AC |
3119 | -- If the pragma comes from an aspect specification, replace |
3120 | -- the saved expression because all type references must be | |
3121 | -- substituted for the call to Preanalyze_Spec_Expression in | |
3122 | -- Check_Aspect_At_xxx routines. | |
51148dda | 3123 | |
b554177a AC |
3124 | if Present (Prag_Asp) then |
3125 | Set_Entity (Identifier (Prag_Asp), New_Copy_Tree (Expr)); | |
998429d6 AC |
3126 | end if; |
3127 | ||
998429d6 AC |
3128 | Add_Invariant_Check (Prag, Expr, Checks); |
3129 | end if; | |
3130 | ||
3131 | Next_Rep_Item (Prag); | |
51148dda | 3132 | end loop; |
003d46d5 | 3133 | end Add_Own_Invariants; |
51148dda AC |
3134 | |
3135 | ------------------------------------- | |
3136 | -- Add_Record_Component_Invariants -- | |
3137 | ------------------------------------- | |
3138 | ||
3139 | procedure Add_Record_Component_Invariants | |
3140 | (T : Entity_Id; | |
3141 | Obj_Id : Entity_Id; | |
3142 | Checks : in out List_Id) | |
3143 | is | |
3144 | procedure Process_Component_List | |
3145 | (Comp_List : Node_Id; | |
3146 | CL_Checks : in out List_Id); | |
3147 | -- Generate invariant checks for all record components found in | |
3148 | -- component list Comp_List, including variant parts. All created | |
3149 | -- checks are added to list CL_Checks. | |
3150 | ||
3151 | procedure Process_Record_Component | |
3152 | (Comp_Id : Entity_Id; | |
3153 | Comp_Checks : in out List_Id); | |
3154 | -- Generate an invariant check for a record component identified by | |
3155 | -- Comp_Id. All created checks are added to list Comp_Checks. | |
3156 | ||
3157 | ---------------------------- | |
3158 | -- Process_Component_List -- | |
3159 | ---------------------------- | |
3160 | ||
3161 | procedure Process_Component_List | |
3162 | (Comp_List : Node_Id; | |
3163 | CL_Checks : in out List_Id) | |
3164 | is | |
3165 | Comp : Node_Id; | |
3166 | Var : Node_Id; | |
3167 | Var_Alts : List_Id := No_List; | |
3168 | Var_Checks : List_Id := No_List; | |
3169 | Var_Stmts : List_Id; | |
3170 | ||
3171 | Produced_Variant_Check : Boolean := False; | |
3172 | -- This flag tracks whether the component has produced at least | |
3173 | -- one invariant check. | |
3174 | ||
3175 | begin | |
3176 | -- Traverse the component items | |
3177 | ||
3178 | Comp := First (Component_Items (Comp_List)); | |
3179 | while Present (Comp) loop | |
3180 | if Nkind (Comp) = N_Component_Declaration then | |
3181 | ||
3182 | -- Generate the component invariant check | |
3183 | ||
3184 | Process_Record_Component | |
3185 | (Comp_Id => Defining_Entity (Comp), | |
3186 | Comp_Checks => CL_Checks); | |
3187 | end if; | |
3188 | ||
3189 | Next (Comp); | |
3190 | end loop; | |
3191 | ||
3192 | -- Traverse the variant part | |
3193 | ||
3194 | if Present (Variant_Part (Comp_List)) then | |
3195 | Var := First (Variants (Variant_Part (Comp_List))); | |
3196 | while Present (Var) loop | |
3197 | Var_Checks := No_List; | |
3198 | ||
3199 | -- Generate invariant checks for all components and variant | |
3200 | -- parts that qualify. | |
3201 | ||
3202 | Process_Component_List | |
3203 | (Comp_List => Component_List (Var), | |
3204 | CL_Checks => Var_Checks); | |
3205 | ||
3206 | -- The components of the current variant produced at least | |
3207 | -- one invariant check. | |
3208 | ||
3209 | if Present (Var_Checks) then | |
3210 | Var_Stmts := Var_Checks; | |
3211 | Produced_Variant_Check := True; | |
3212 | ||
3213 | -- Otherwise there are either no components with invariants, | |
3214 | -- assertions are disabled, or Assertion_Policy Ignore is in | |
3215 | -- effect. | |
3216 | ||
3217 | else | |
3218 | Var_Stmts := New_List (Make_Null_Statement (Loc)); | |
3219 | end if; | |
3220 | ||
3221 | Append_New_To (Var_Alts, | |
3222 | Make_Case_Statement_Alternative (Loc, | |
3223 | Discrete_Choices => | |
3224 | New_Copy_List (Discrete_Choices (Var)), | |
3225 | Statements => Var_Stmts)); | |
3226 | ||
3227 | Next (Var); | |
3228 | end loop; | |
3229 | ||
3230 | -- Create a case statement which verifies the invariant checks | |
3231 | -- of a particular component list depending on the discriminant | |
3232 | -- values only when there is at least one real invariant check. | |
3233 | ||
3234 | if Produced_Variant_Check then | |
3235 | Append_New_To (CL_Checks, | |
3236 | Make_Case_Statement (Loc, | |
3237 | Expression => | |
3238 | Make_Selected_Component (Loc, | |
3239 | Prefix => New_Occurrence_Of (Obj_Id, Loc), | |
3240 | Selector_Name => | |
3241 | New_Occurrence_Of | |
3242 | (Entity (Name (Variant_Part (Comp_List))), Loc)), | |
3243 | Alternatives => Var_Alts)); | |
3244 | end if; | |
3245 | end if; | |
3246 | end Process_Component_List; | |
3247 | ||
3248 | ------------------------------ | |
3249 | -- Process_Record_Component -- | |
3250 | ------------------------------ | |
3251 | ||
3252 | procedure Process_Record_Component | |
3253 | (Comp_Id : Entity_Id; | |
3254 | Comp_Checks : in out List_Id) | |
3255 | is | |
3256 | Comp_Typ : constant Entity_Id := Etype (Comp_Id); | |
3257 | Proc_Id : Entity_Id; | |
3258 | ||
3259 | Produced_Component_Check : Boolean := False; | |
3260 | -- This flag tracks whether the component has produced at least | |
3261 | -- one invariant check. | |
3262 | ||
3263 | begin | |
3264 | -- Nothing to do for internal component _parent. Note that it is | |
3265 | -- not desirable to check whether the component comes from source | |
3266 | -- because protected type components are relocated to an internal | |
3267 | -- corresponding record, but still need processing. | |
3268 | ||
3269 | if Chars (Comp_Id) = Name_uParent then | |
3270 | return; | |
3271 | end if; | |
3272 | ||
3273 | -- Verify the invariant of the component. Note that an access | |
3274 | -- type may have an invariant when it acts as the full view of a | |
3275 | -- private type and the invariant appears on the partial view. In | |
3276 | -- this case verify the access value itself. | |
3277 | ||
3278 | if Has_Invariants (Comp_Typ) then | |
3279 | ||
3280 | -- In GNATprove mode, the component invariants are checked by | |
3281 | -- other means. They should not be added to the record type | |
3282 | -- invariant procedure, so that the procedure can be used to | |
3283 | -- check the record type invariants if any. | |
3284 | ||
3285 | if GNATprove_Mode then | |
3286 | null; | |
3287 | ||
3288 | else | |
3289 | Proc_Id := Invariant_Procedure (Base_Type (Comp_Typ)); | |
3290 | ||
3291 | -- The component type should have an invariant procedure | |
3292 | -- if it has invariants of its own or inherits class-wide | |
3293 | -- invariants from parent or interface types. | |
3294 | ||
3295 | pragma Assert (Present (Proc_Id)); | |
3296 | ||
3297 | -- Generate: | |
3298 | -- <Comp_Typ>Invariant (T (_object).<Comp_Id>); | |
3299 | ||
3300 | -- Note that the invariant procedure may have a null body if | |
3301 | -- assertions are disabled or Assertion_Policy Ignore is in | |
3302 | -- effect. | |
3303 | ||
3304 | if not Has_Null_Body (Proc_Id) then | |
3305 | Append_New_To (Comp_Checks, | |
3306 | Make_Procedure_Call_Statement (Loc, | |
3307 | Name => | |
3308 | New_Occurrence_Of (Proc_Id, Loc), | |
3309 | Parameter_Associations => New_List ( | |
3310 | Make_Selected_Component (Loc, | |
3311 | Prefix => | |
3312 | Unchecked_Convert_To | |
3313 | (T, New_Occurrence_Of (Obj_Id, Loc)), | |
3314 | Selector_Name => | |
3315 | New_Occurrence_Of (Comp_Id, Loc))))); | |
3316 | end if; | |
3317 | end if; | |
3318 | ||
3319 | Produced_Check := True; | |
3320 | Produced_Component_Check := True; | |
3321 | end if; | |
3322 | ||
3323 | if Produced_Component_Check and then Has_Unchecked_Union (T) then | |
3324 | Error_Msg_NE | |
3325 | ("invariants cannot be checked on components of " | |
2d6f6e08 | 3326 | & "unchecked_union type &??", Comp_Id, T); |
51148dda AC |
3327 | end if; |
3328 | end Process_Record_Component; | |
3329 | ||
3330 | -- Local variables | |
3331 | ||
3332 | Comps : Node_Id; | |
3333 | Def : Node_Id; | |
3334 | ||
3335 | -- Start of processing for Add_Record_Component_Invariants | |
3336 | ||
3337 | begin | |
3338 | -- An untagged derived type inherits the components of its parent | |
3339 | -- type. In order to avoid creating redundant invariant checks, do | |
3340 | -- not process the components now. Instead wait until the ultimate | |
3341 | -- parent of the untagged derivation chain is reached. | |
3342 | ||
3343 | if not Is_Untagged_Derivation (T) then | |
3344 | Def := Type_Definition (Parent (T)); | |
3345 | ||
3346 | if Nkind (Def) = N_Derived_Type_Definition then | |
3347 | Def := Record_Extension_Part (Def); | |
3348 | end if; | |
3349 | ||
3350 | pragma Assert (Nkind (Def) = N_Record_Definition); | |
3351 | Comps := Component_List (Def); | |
3352 | ||
3353 | if Present (Comps) then | |
3354 | Process_Component_List | |
3355 | (Comp_List => Comps, | |
3356 | CL_Checks => Checks); | |
3357 | end if; | |
3358 | end if; | |
3359 | end Add_Record_Component_Invariants; | |
3360 | ||
51148dda AC |
3361 | -- Local variables |
3362 | ||
9057bd6a HK |
3363 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
3364 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
3365 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 | 3366 | |
ded462b0 | 3367 | Dummy : Entity_Id; |
51148dda AC |
3368 | Priv_Item : Node_Id; |
3369 | Proc_Body : Node_Id; | |
3370 | Proc_Body_Id : Entity_Id; | |
3371 | Proc_Decl : Node_Id; | |
3372 | Proc_Id : Entity_Id; | |
3373 | Stmts : List_Id := No_List; | |
3374 | ||
b554177a | 3375 | CRec_Typ : Entity_Id := Empty; |
51148dda AC |
3376 | -- The corresponding record type of Full_Typ |
3377 | ||
b554177a | 3378 | Full_Proc : Entity_Id := Empty; |
51148dda AC |
3379 | -- The entity of the "full" invariant procedure |
3380 | ||
b554177a | 3381 | Full_Typ : Entity_Id := Empty; |
51148dda AC |
3382 | -- The full view of the working type |
3383 | ||
b554177a | 3384 | Obj_Id : Entity_Id := Empty; |
51148dda AC |
3385 | -- The _object formal parameter of the invariant procedure |
3386 | ||
b554177a | 3387 | Part_Proc : Entity_Id := Empty; |
51148dda AC |
3388 | -- The entity of the "partial" invariant procedure |
3389 | ||
b554177a | 3390 | Priv_Typ : Entity_Id := Empty; |
51148dda AC |
3391 | -- The partial view of the working type |
3392 | ||
b554177a | 3393 | Work_Typ : Entity_Id := Empty; |
51148dda AC |
3394 | -- The working type |
3395 | ||
3396 | -- Start of processing for Build_Invariant_Procedure_Body | |
3397 | ||
3398 | begin | |
3399 | Work_Typ := Typ; | |
3400 | ||
b97813ab EB |
3401 | -- Do not process the underlying full view of a private type. There is |
3402 | -- no way to get back to the partial view, plus the body will be built | |
3403 | -- by the full view or the base type. | |
3404 | ||
3405 | if Is_Underlying_Full_View (Work_Typ) then | |
3406 | return; | |
3407 | ||
51148dda AC |
3408 | -- The input type denotes the implementation base type of a constrained |
3409 | -- array type. Work with the first subtype as all invariant pragmas are | |
3410 | -- on its rep item chain. | |
3411 | ||
b97813ab | 3412 | elsif Ekind (Work_Typ) = E_Array_Type and then Is_Itype (Work_Typ) then |
51148dda AC |
3413 | Work_Typ := First_Subtype (Work_Typ); |
3414 | ||
3415 | -- The input type denotes the corresponding record type of a protected | |
3416 | -- or task type. Work with the concurrent type because the corresponding | |
3417 | -- record type may not be visible to clients of the type. | |
3418 | ||
3419 | elsif Ekind (Work_Typ) = E_Record_Type | |
3420 | and then Is_Concurrent_Record_Type (Work_Typ) | |
3421 | then | |
3422 | Work_Typ := Corresponding_Concurrent_Type (Work_Typ); | |
3423 | end if; | |
3424 | ||
3425 | -- The working type may be subject to pragma Ghost. Set the mode now to | |
3426 | -- ensure that the invariant procedure is properly marked as Ghost. | |
3427 | ||
f9a8f910 | 3428 | Set_Ghost_Mode (Work_Typ); |
51148dda AC |
3429 | |
3430 | -- The type must either have invariants of its own, inherit class-wide | |
3431 | -- invariants from parent types or interfaces, or be an array or record | |
3432 | -- type whose components have invariants. | |
3433 | ||
3434 | pragma Assert (Has_Invariants (Work_Typ)); | |
3435 | ||
b554177a AC |
3436 | -- Interfaces are treated as the partial view of a private type in order |
3437 | -- to achieve uniformity with the general case. | |
51148dda AC |
3438 | |
3439 | if Is_Interface (Work_Typ) then | |
b554177a | 3440 | Priv_Typ := Work_Typ; |
51148dda | 3441 | |
b554177a | 3442 | -- Otherwise obtain both views of the type |
51148dda | 3443 | |
b554177a AC |
3444 | else |
3445 | Get_Views (Work_Typ, Priv_Typ, Full_Typ, Dummy, CRec_Typ); | |
3446 | end if; | |
51148dda AC |
3447 | |
3448 | -- The caller requests a body for the partial invariant procedure | |
3449 | ||
3450 | if Partial_Invariant then | |
3451 | Full_Proc := Invariant_Procedure (Work_Typ); | |
3452 | Proc_Id := Partial_Invariant_Procedure (Work_Typ); | |
3453 | ||
3454 | -- The "full" invariant procedure body was already created | |
3455 | ||
3456 | if Present (Full_Proc) | |
3457 | and then Present | |
3458 | (Corresponding_Body (Unit_Declaration_Node (Full_Proc))) | |
3459 | then | |
3460 | -- This scenario happens only when the type is an untagged | |
3461 | -- derivation from a private parent and the underlying full | |
3462 | -- view was processed before the partial view. | |
3463 | ||
3464 | pragma Assert | |
3465 | (Is_Untagged_Private_Derivation (Priv_Typ, Full_Typ)); | |
3466 | ||
3467 | -- Nothing to do because the processing of the underlying full | |
3468 | -- view already checked the invariants of the partial view. | |
3469 | ||
3470 | goto Leave; | |
3471 | end if; | |
3472 | ||
3473 | -- Create a declaration for the "partial" invariant procedure if it | |
3474 | -- is not available. | |
3475 | ||
3476 | if No (Proc_Id) then | |
3477 | Build_Invariant_Procedure_Declaration | |
3478 | (Typ => Work_Typ, | |
3479 | Partial_Invariant => True); | |
3480 | ||
3481 | Proc_Id := Partial_Invariant_Procedure (Work_Typ); | |
3482 | end if; | |
3483 | ||
3484 | -- The caller requests a body for the "full" invariant procedure | |
3485 | ||
3486 | else | |
3487 | Proc_Id := Invariant_Procedure (Work_Typ); | |
3488 | Part_Proc := Partial_Invariant_Procedure (Work_Typ); | |
3489 | ||
3490 | -- Create a declaration for the "full" invariant procedure if it is | |
3491 | -- not available. | |
3492 | ||
3493 | if No (Proc_Id) then | |
3494 | Build_Invariant_Procedure_Declaration (Work_Typ); | |
3495 | Proc_Id := Invariant_Procedure (Work_Typ); | |
3496 | end if; | |
3497 | end if; | |
3498 | ||
3499 | -- At this point there should be an invariant procedure declaration | |
3500 | ||
3501 | pragma Assert (Present (Proc_Id)); | |
3502 | Proc_Decl := Unit_Declaration_Node (Proc_Id); | |
3503 | ||
3504 | -- Nothing to do if the invariant procedure already has a body | |
3505 | ||
3506 | if Present (Corresponding_Body (Proc_Decl)) then | |
3507 | goto Leave; | |
3508 | end if; | |
3509 | ||
b554177a AC |
3510 | -- Emulate the environment of the invariant procedure by installing its |
3511 | -- scope and formal parameters. Note that this is not needed, but having | |
3512 | -- the scope installed helps with the detection of invariant-related | |
3513 | -- errors. | |
51148dda AC |
3514 | |
3515 | Push_Scope (Proc_Id); | |
3516 | Install_Formals (Proc_Id); | |
3517 | ||
3518 | Obj_Id := First_Formal (Proc_Id); | |
3519 | pragma Assert (Present (Obj_Id)); | |
3520 | ||
3521 | -- The "partial" invariant procedure verifies the invariants of the | |
3522 | -- partial view only. | |
3523 | ||
3524 | if Partial_Invariant then | |
3525 | pragma Assert (Present (Priv_Typ)); | |
3526 | ||
003d46d5 | 3527 | Add_Own_Invariants |
998429d6 AC |
3528 | (T => Priv_Typ, |
3529 | Obj_Id => Obj_Id, | |
3530 | Checks => Stmts); | |
51148dda AC |
3531 | |
3532 | -- Otherwise the "full" invariant procedure verifies the invariants of | |
3533 | -- the full view, all array or record components, as well as class-wide | |
3534 | -- invariants inherited from parent types or interfaces. In addition, it | |
3535 | -- indirectly verifies the invariants of the partial view by calling the | |
3536 | -- "partial" invariant procedure. | |
3537 | ||
3538 | else | |
3539 | pragma Assert (Present (Full_Typ)); | |
3540 | ||
3541 | -- Check the invariants of the partial view by calling the "partial" | |
3542 | -- invariant procedure. Generate: | |
3543 | ||
3544 | -- <Work_Typ>Partial_Invariant (_object); | |
3545 | ||
3546 | if Present (Part_Proc) then | |
3547 | Append_New_To (Stmts, | |
3548 | Make_Procedure_Call_Statement (Loc, | |
3549 | Name => New_Occurrence_Of (Part_Proc, Loc), | |
3550 | Parameter_Associations => New_List ( | |
3551 | New_Occurrence_Of (Obj_Id, Loc)))); | |
3552 | ||
3553 | Produced_Check := True; | |
3554 | end if; | |
3555 | ||
3556 | Priv_Item := Empty; | |
3557 | ||
3558 | -- Derived subtypes do not have a partial view | |
3559 | ||
3560 | if Present (Priv_Typ) then | |
3561 | ||
3562 | -- The processing of the "full" invariant procedure intentionally | |
3563 | -- skips the partial view because a) this may result in changes of | |
3564 | -- visibility and b) lead to duplicate checks. However, when the | |
3565 | -- full view is the underlying full view of an untagged derived | |
3566 | -- type whose parent type is private, partial invariants appear on | |
3567 | -- the rep item chain of the partial view only. | |
3568 | ||
3569 | -- package Pack_1 is | |
3570 | -- type Root ... is private; | |
3571 | -- private | |
3572 | -- <full view of Root> | |
3573 | -- end Pack_1; | |
3574 | ||
3575 | -- with Pack_1; | |
3576 | -- package Pack_2 is | |
3577 | -- type Child is new Pack_1.Root with Type_Invariant => ...; | |
3578 | -- <underlying full view of Child> | |
3579 | -- end Pack_2; | |
3580 | ||
3581 | -- As a result, the processing of the full view must also consider | |
3582 | -- all invariants of the partial view. | |
3583 | ||
3584 | if Is_Untagged_Private_Derivation (Priv_Typ, Full_Typ) then | |
3585 | null; | |
3586 | ||
3587 | -- Otherwise the invariants of the partial view are ignored | |
3588 | ||
3589 | else | |
3590 | -- Note that the rep item chain is shared between the partial | |
3591 | -- and full views of a type. To avoid processing the invariants | |
3592 | -- of the partial view, signal the logic to stop when the first | |
3593 | -- rep item of the partial view has been reached. | |
3594 | ||
3595 | Priv_Item := First_Rep_Item (Priv_Typ); | |
3596 | ||
3597 | -- Ignore the invariants of the partial view by eliminating the | |
3598 | -- view. | |
3599 | ||
3600 | Priv_Typ := Empty; | |
3601 | end if; | |
3602 | end if; | |
3603 | ||
3604 | -- Process the invariants of the full view and in certain cases those | |
3605 | -- of the partial view. This also handles any invariants on array or | |
3606 | -- record components. | |
3607 | ||
003d46d5 | 3608 | Add_Own_Invariants |
998429d6 | 3609 | (T => Priv_Typ, |
51148dda AC |
3610 | Obj_Id => Obj_Id, |
3611 | Checks => Stmts, | |
3612 | Priv_Item => Priv_Item); | |
3613 | ||
003d46d5 | 3614 | Add_Own_Invariants |
998429d6 AC |
3615 | (T => Full_Typ, |
3616 | Obj_Id => Obj_Id, | |
3617 | Checks => Stmts, | |
3618 | Priv_Item => Priv_Item); | |
3619 | ||
b554177a AC |
3620 | -- Process the elements of an array type |
3621 | ||
3622 | if Is_Array_Type (Full_Typ) then | |
3623 | Add_Array_Component_Invariants (Full_Typ, Obj_Id, Stmts); | |
3624 | ||
3625 | -- Process the components of a record type | |
3626 | ||
3627 | elsif Ekind (Full_Typ) = E_Record_Type then | |
3628 | Add_Record_Component_Invariants (Full_Typ, Obj_Id, Stmts); | |
3629 | ||
3630 | -- Process the components of a corresponding record | |
3631 | ||
3632 | elsif Present (CRec_Typ) then | |
998429d6 AC |
3633 | Add_Record_Component_Invariants (CRec_Typ, Obj_Id, Stmts); |
3634 | end if; | |
3635 | ||
51148dda AC |
3636 | -- Process the inherited class-wide invariants of all parent types. |
3637 | -- This also handles any invariants on record components. | |
3638 | ||
ded462b0 | 3639 | Add_Parent_Invariants (Full_Typ, Obj_Id, Stmts); |
998429d6 | 3640 | |
ded462b0 AC |
3641 | -- Process the inherited class-wide invariants of all implemented |
3642 | -- interface types. | |
998429d6 | 3643 | |
ded462b0 | 3644 | Add_Interface_Invariants (Full_Typ, Obj_Id, Stmts); |
51148dda AC |
3645 | end if; |
3646 | ||
3647 | End_Scope; | |
3648 | ||
3649 | -- At this point there should be at least one invariant check. If this | |
3650 | -- is not the case, then the invariant-related flags were not properly | |
3651 | -- set, or there is a missing invariant procedure on one of the array | |
3652 | -- or record components. | |
3653 | ||
3654 | pragma Assert (Produced_Check); | |
3655 | ||
3656 | -- Account for the case where assertions are disabled or all invariant | |
3657 | -- checks are subject to Assertion_Policy Ignore. Produce a completing | |
3658 | -- empty body. | |
3659 | ||
3660 | if No (Stmts) then | |
3661 | Stmts := New_List (Make_Null_Statement (Loc)); | |
3662 | end if; | |
3663 | ||
3664 | -- Generate: | |
b554177a | 3665 | -- procedure <Work_Typ>[Partial_]Invariant (_object : <Obj_Typ>) is |
51148dda AC |
3666 | -- begin |
3667 | -- <Stmts> | |
3668 | -- end <Work_Typ>[Partial_]Invariant; | |
3669 | ||
3670 | Proc_Body := | |
3671 | Make_Subprogram_Body (Loc, | |
3672 | Specification => | |
3673 | Copy_Subprogram_Spec (Parent (Proc_Id)), | |
3674 | Declarations => Empty_List, | |
3675 | Handled_Statement_Sequence => | |
3676 | Make_Handled_Sequence_Of_Statements (Loc, | |
3677 | Statements => Stmts)); | |
3678 | Proc_Body_Id := Defining_Entity (Proc_Body); | |
3679 | ||
3680 | -- Perform minor decoration in case the body is not analyzed | |
3681 | ||
3682 | Set_Ekind (Proc_Body_Id, E_Subprogram_Body); | |
3683 | Set_Etype (Proc_Body_Id, Standard_Void_Type); | |
3684 | Set_Scope (Proc_Body_Id, Current_Scope); | |
3685 | ||
3686 | -- Link both spec and body to avoid generating duplicates | |
3687 | ||
3688 | Set_Corresponding_Body (Proc_Decl, Proc_Body_Id); | |
3689 | Set_Corresponding_Spec (Proc_Body, Proc_Id); | |
3690 | ||
3691 | -- The body should not be inserted into the tree when the context is | |
65f1ca2e | 3692 | -- a generic unit because it is not part of the template. Note |
51148dda AC |
3693 | -- that the body must still be generated in order to resolve the |
3694 | -- invariants. | |
3695 | ||
65f1ca2e | 3696 | if Inside_A_Generic then |
51148dda AC |
3697 | null; |
3698 | ||
3699 | -- Semi-insert the body into the tree for GNATprove by setting its | |
3700 | -- Parent field. This allows for proper upstream tree traversals. | |
3701 | ||
3702 | elsif GNATprove_Mode then | |
3703 | Set_Parent (Proc_Body, Parent (Declaration_Node (Work_Typ))); | |
3704 | ||
3705 | -- Otherwise the body is part of the freezing actions of the type | |
3706 | ||
3707 | else | |
3708 | Append_Freeze_Action (Work_Typ, Proc_Body); | |
3709 | end if; | |
3710 | ||
3711 | <<Leave>> | |
9057bd6a | 3712 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
51148dda AC |
3713 | end Build_Invariant_Procedure_Body; |
3714 | ||
3715 | ------------------------------------------- | |
3716 | -- Build_Invariant_Procedure_Declaration -- | |
3717 | ------------------------------------------- | |
3718 | ||
3719 | -- WARNING: This routine manages Ghost regions. Return statements must be | |
3720 | -- replaced by gotos which jump to the end of the routine and restore the | |
3721 | -- Ghost mode. | |
3722 | ||
3723 | procedure Build_Invariant_Procedure_Declaration | |
3724 | (Typ : Entity_Id; | |
3725 | Partial_Invariant : Boolean := False) | |
3726 | is | |
3727 | Loc : constant Source_Ptr := Sloc (Typ); | |
3728 | ||
9057bd6a HK |
3729 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
3730 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
3731 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 | 3732 | |
51148dda AC |
3733 | Proc_Decl : Node_Id; |
3734 | Proc_Id : Entity_Id; | |
3735 | Proc_Nam : Name_Id; | |
3736 | Typ_Decl : Node_Id; | |
3737 | ||
3738 | CRec_Typ : Entity_Id; | |
3739 | -- The corresponding record type of Full_Typ | |
3740 | ||
51148dda AC |
3741 | Full_Typ : Entity_Id; |
3742 | -- The full view of working type | |
3743 | ||
3744 | Obj_Id : Entity_Id; | |
3745 | -- The _object formal parameter of the invariant procedure | |
3746 | ||
b554177a AC |
3747 | Obj_Typ : Entity_Id; |
3748 | -- The type of the _object formal parameter | |
3749 | ||
51148dda AC |
3750 | Priv_Typ : Entity_Id; |
3751 | -- The partial view of working type | |
3752 | ||
b97813ab EB |
3753 | UFull_Typ : Entity_Id; |
3754 | -- The underlying full view of Full_Typ | |
3755 | ||
51148dda AC |
3756 | Work_Typ : Entity_Id; |
3757 | -- The working type | |
3758 | ||
3759 | begin | |
3760 | Work_Typ := Typ; | |
3761 | ||
3762 | -- The input type denotes the implementation base type of a constrained | |
3763 | -- array type. Work with the first subtype as all invariant pragmas are | |
3764 | -- on its rep item chain. | |
3765 | ||
3766 | if Ekind (Work_Typ) = E_Array_Type and then Is_Itype (Work_Typ) then | |
3767 | Work_Typ := First_Subtype (Work_Typ); | |
3768 | ||
3769 | -- The input denotes the corresponding record type of a protected or a | |
3770 | -- task type. Work with the concurrent type because the corresponding | |
3771 | -- record type may not be visible to clients of the type. | |
3772 | ||
3773 | elsif Ekind (Work_Typ) = E_Record_Type | |
3774 | and then Is_Concurrent_Record_Type (Work_Typ) | |
3775 | then | |
3776 | Work_Typ := Corresponding_Concurrent_Type (Work_Typ); | |
3777 | end if; | |
3778 | ||
3779 | -- The working type may be subject to pragma Ghost. Set the mode now to | |
3780 | -- ensure that the invariant procedure is properly marked as Ghost. | |
3781 | ||
f9a8f910 | 3782 | Set_Ghost_Mode (Work_Typ); |
51148dda AC |
3783 | |
3784 | -- The type must either have invariants of its own, inherit class-wide | |
3785 | -- invariants from parent or interface types, or be an array or record | |
3786 | -- type whose components have invariants. | |
3787 | ||
3788 | pragma Assert (Has_Invariants (Work_Typ)); | |
3789 | ||
51148dda AC |
3790 | -- Nothing to do if the type already has a "partial" invariant procedure |
3791 | ||
b554177a | 3792 | if Partial_Invariant then |
51148dda AC |
3793 | if Present (Partial_Invariant_Procedure (Work_Typ)) then |
3794 | goto Leave; | |
3795 | end if; | |
3796 | ||
3797 | -- Nothing to do if the type already has a "full" invariant procedure | |
3798 | ||
3799 | elsif Present (Invariant_Procedure (Work_Typ)) then | |
3800 | goto Leave; | |
3801 | end if; | |
3802 | ||
3803 | -- The caller requests the declaration of the "partial" invariant | |
3804 | -- procedure. | |
3805 | ||
3806 | if Partial_Invariant then | |
3807 | Proc_Nam := New_External_Name (Chars (Work_Typ), "Partial_Invariant"); | |
3808 | ||
3809 | -- Otherwise the caller requests the declaration of the "full" invariant | |
3810 | -- procedure. | |
3811 | ||
3812 | else | |
3813 | Proc_Nam := New_External_Name (Chars (Work_Typ), "Invariant"); | |
3814 | end if; | |
3815 | ||
3816 | Proc_Id := Make_Defining_Identifier (Loc, Chars => Proc_Nam); | |
3817 | ||
3818 | -- Perform minor decoration in case the declaration is not analyzed | |
3819 | ||
3820 | Set_Ekind (Proc_Id, E_Procedure); | |
3821 | Set_Etype (Proc_Id, Standard_Void_Type); | |
3822 | Set_Scope (Proc_Id, Current_Scope); | |
3823 | ||
3824 | if Partial_Invariant then | |
3825 | Set_Is_Partial_Invariant_Procedure (Proc_Id); | |
3826 | Set_Partial_Invariant_Procedure (Work_Typ, Proc_Id); | |
3827 | else | |
3828 | Set_Is_Invariant_Procedure (Proc_Id); | |
3829 | Set_Invariant_Procedure (Work_Typ, Proc_Id); | |
3830 | end if; | |
3831 | ||
3832 | -- The invariant procedure requires debug info when the invariants are | |
3833 | -- subject to Source Coverage Obligations. | |
3834 | ||
90e491a7 | 3835 | if Generate_SCO then |
923ecd0e | 3836 | Set_Debug_Info_Needed (Proc_Id); |
51148dda AC |
3837 | end if; |
3838 | ||
3839 | -- Obtain all views of the input type | |
3840 | ||
b97813ab | 3841 | Get_Views (Work_Typ, Priv_Typ, Full_Typ, UFull_Typ, CRec_Typ); |
51148dda | 3842 | |
b97813ab | 3843 | -- Associate the invariant procedure and various flags with all views |
51148dda AC |
3844 | |
3845 | Propagate_Invariant_Attributes (Priv_Typ, From_Typ => Work_Typ); | |
3846 | Propagate_Invariant_Attributes (Full_Typ, From_Typ => Work_Typ); | |
b97813ab | 3847 | Propagate_Invariant_Attributes (UFull_Typ, From_Typ => Work_Typ); |
51148dda AC |
3848 | Propagate_Invariant_Attributes (CRec_Typ, From_Typ => Work_Typ); |
3849 | ||
3850 | -- The declaration of the invariant procedure is inserted after the | |
3851 | -- declaration of the partial view as this allows for proper external | |
3852 | -- visibility. | |
3853 | ||
3854 | if Present (Priv_Typ) then | |
3855 | Typ_Decl := Declaration_Node (Priv_Typ); | |
3856 | ||
63a5b3dc AC |
3857 | -- Anonymous arrays in object declarations have no explicit declaration |
3858 | -- so use the related object declaration as the insertion point. | |
3859 | ||
3860 | elsif Is_Itype (Work_Typ) and then Is_Array_Type (Work_Typ) then | |
3861 | Typ_Decl := Associated_Node_For_Itype (Work_Typ); | |
51148dda | 3862 | |
4ac62786 AC |
3863 | -- Derived types with the full view as parent do not have a partial |
3864 | -- view. Insert the invariant procedure after the derived type. | |
3865 | ||
51148dda AC |
3866 | else |
3867 | Typ_Decl := Declaration_Node (Full_Typ); | |
3868 | end if; | |
3869 | ||
3870 | -- The type should have a declarative node | |
3871 | ||
3872 | pragma Assert (Present (Typ_Decl)); | |
3873 | ||
3874 | -- Create the formal parameter which emulates the variable-like behavior | |
3875 | -- of the current type instance. | |
3876 | ||
3877 | Obj_Id := Make_Defining_Identifier (Loc, Chars => Name_uObject); | |
3878 | ||
b554177a AC |
3879 | -- When generating an invariant procedure declaration for an abstract |
3880 | -- type (including interfaces), use the class-wide type as the _object | |
3881 | -- type. This has several desirable effects: | |
3882 | ||
3883 | -- * The invariant procedure does not become a primitive of the type. | |
3884 | -- This eliminates the need to either special case the treatment of | |
3885 | -- invariant procedures, or to make it a predefined primitive and | |
3886 | -- force every derived type to potentially provide an empty body. | |
3887 | ||
3888 | -- * The invariant procedure does not need to be declared as abstract. | |
ca0b6141 | 3889 | -- This allows for a proper body, which in turn avoids redundant |
b554177a AC |
3890 | -- processing of the same invariants for types with multiple views. |
3891 | ||
3892 | -- * The class-wide type allows for calls to abstract primitives | |
ca0b6141 | 3893 | -- within a nonabstract subprogram. The calls are treated as |
b554177a AC |
3894 | -- dispatching and require additional processing when they are |
3895 | -- remapped to call primitives of derived types. See routine | |
3896 | -- Replace_References for details. | |
3897 | ||
3898 | if Is_Abstract_Type (Work_Typ) then | |
3899 | Obj_Typ := Class_Wide_Type (Work_Typ); | |
3900 | else | |
3901 | Obj_Typ := Work_Typ; | |
3902 | end if; | |
3903 | ||
51148dda AC |
3904 | -- Perform minor decoration in case the declaration is not analyzed |
3905 | ||
3906 | Set_Ekind (Obj_Id, E_In_Parameter); | |
b554177a | 3907 | Set_Etype (Obj_Id, Obj_Typ); |
51148dda AC |
3908 | Set_Scope (Obj_Id, Proc_Id); |
3909 | ||
3910 | Set_First_Entity (Proc_Id, Obj_Id); | |
51f3e4e1 | 3911 | Set_Last_Entity (Proc_Id, Obj_Id); |
51148dda AC |
3912 | |
3913 | -- Generate: | |
b554177a | 3914 | -- procedure <Work_Typ>[Partial_]Invariant (_object : <Obj_Typ>); |
51148dda AC |
3915 | |
3916 | Proc_Decl := | |
3917 | Make_Subprogram_Declaration (Loc, | |
3918 | Specification => | |
3919 | Make_Procedure_Specification (Loc, | |
3920 | Defining_Unit_Name => Proc_Id, | |
3921 | Parameter_Specifications => New_List ( | |
3922 | Make_Parameter_Specification (Loc, | |
3923 | Defining_Identifier => Obj_Id, | |
b554177a | 3924 | Parameter_Type => New_Occurrence_Of (Obj_Typ, Loc))))); |
51148dda AC |
3925 | |
3926 | -- The declaration should not be inserted into the tree when the context | |
65f1ca2e | 3927 | -- is a generic unit because it is not part of the template. |
51148dda | 3928 | |
65f1ca2e | 3929 | if Inside_A_Generic then |
51148dda AC |
3930 | null; |
3931 | ||
3932 | -- Semi-insert the declaration into the tree for GNATprove by setting | |
3933 | -- its Parent field. This allows for proper upstream tree traversals. | |
3934 | ||
3935 | elsif GNATprove_Mode then | |
3936 | Set_Parent (Proc_Decl, Parent (Typ_Decl)); | |
3937 | ||
3938 | -- Otherwise insert the declaration | |
3939 | ||
3940 | else | |
3941 | pragma Assert (Present (Typ_Decl)); | |
3942 | Insert_After_And_Analyze (Typ_Decl, Proc_Decl); | |
3943 | end if; | |
3944 | ||
3945 | <<Leave>> | |
9057bd6a | 3946 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
51148dda AC |
3947 | end Build_Invariant_Procedure_Declaration; |
3948 | ||
51b42ffa AC |
3949 | -------------------------- |
3950 | -- Build_Procedure_Form -- | |
3951 | -------------------------- | |
3952 | ||
3953 | procedure Build_Procedure_Form (N : Node_Id) is | |
268aeaa9 AC |
3954 | Loc : constant Source_Ptr := Sloc (N); |
3955 | Subp : constant Entity_Id := Defining_Entity (N); | |
51b42ffa AC |
3956 | |
3957 | Func_Formal : Entity_Id; | |
3958 | Proc_Formals : List_Id; | |
17fd72ce | 3959 | Proc_Decl : Node_Id; |
51b42ffa AC |
3960 | |
3961 | begin | |
2a253c5b AC |
3962 | -- No action needed if this transformation was already done, or in case |
3963 | -- of subprogram renaming declarations. | |
aeb98f1d | 3964 | |
a14bbbb4 AC |
3965 | if Nkind (Specification (N)) = N_Procedure_Specification |
3966 | or else Nkind (N) = N_Subprogram_Renaming_Declaration | |
3967 | then | |
aeb98f1d JM |
3968 | return; |
3969 | end if; | |
3970 | ||
2a253c5b AC |
3971 | -- Ditto when dealing with an expression function, where both the |
3972 | -- original expression and the generated declaration end up being | |
3973 | -- expanded here. | |
3974 | ||
3975 | if Rewritten_For_C (Subp) then | |
3976 | return; | |
3977 | end if; | |
3978 | ||
51b42ffa AC |
3979 | Proc_Formals := New_List; |
3980 | ||
3981 | -- Create a list of formal parameters with the same types as the | |
3982 | -- function. | |
3983 | ||
3984 | Func_Formal := First_Formal (Subp); | |
3985 | while Present (Func_Formal) loop | |
3986 | Append_To (Proc_Formals, | |
3987 | Make_Parameter_Specification (Loc, | |
3988 | Defining_Identifier => | |
51b42ffa AC |
3989 | Make_Defining_Identifier (Loc, Chars (Func_Formal)), |
3990 | Parameter_Type => | |
3991 | New_Occurrence_Of (Etype (Func_Formal), Loc))); | |
3992 | ||
3993 | Next_Formal (Func_Formal); | |
3994 | end loop; | |
3995 | ||
3996 | -- Add an extra out parameter to carry the function result | |
3997 | ||
51b42ffa AC |
3998 | Append_To (Proc_Formals, |
3999 | Make_Parameter_Specification (Loc, | |
4000 | Defining_Identifier => | |
b50706ef | 4001 | Make_Defining_Identifier (Loc, Name_UP_RESULT), |
51b42ffa AC |
4002 | Out_Present => True, |
4003 | Parameter_Type => New_Occurrence_Of (Etype (Subp), Loc))); | |
4004 | ||
d79e7af5 AC |
4005 | -- The new procedure declaration is inserted before the function |
4006 | -- declaration. The processing in Build_Procedure_Body_Form relies on | |
4007 | -- this order. Note that we insert before because in the case of a | |
4008 | -- function body with no separate spec, we do not want to insert the | |
4009 | -- new spec after the body which will later get rewritten. | |
51b42ffa | 4010 | |
17fd72ce | 4011 | Proc_Decl := |
51b42ffa AC |
4012 | Make_Subprogram_Declaration (Loc, |
4013 | Specification => | |
4014 | Make_Procedure_Specification (Loc, | |
4015 | Defining_Unit_Name => | |
4016 | Make_Defining_Identifier (Loc, Chars (Subp)), | |
17fd72ce ES |
4017 | Parameter_Specifications => Proc_Formals)); |
4018 | ||
d79e7af5 | 4019 | Insert_Before_And_Analyze (Unit_Declaration_Node (Subp), Proc_Decl); |
17fd72ce ES |
4020 | |
4021 | -- Entity of procedure must remain invisible so that it does not | |
4022 | -- overload subsequent references to the original function. | |
4023 | ||
4024 | Set_Is_Immediately_Visible (Defining_Entity (Proc_Decl), False); | |
51b42ffa | 4025 | |
888be6b1 AC |
4026 | -- Mark the function as having a procedure form and link the function |
4027 | -- and its internally built procedure. | |
51b42ffa AC |
4028 | |
4029 | Set_Rewritten_For_C (Subp); | |
888be6b1 AC |
4030 | Set_Corresponding_Procedure (Subp, Defining_Entity (Proc_Decl)); |
4031 | Set_Corresponding_Function (Defining_Entity (Proc_Decl), Subp); | |
51b42ffa AC |
4032 | end Build_Procedure_Form; |
4033 | ||
70482933 RK |
4034 | ------------------------ |
4035 | -- Build_Runtime_Call -- | |
4036 | ------------------------ | |
4037 | ||
4038 | function Build_Runtime_Call (Loc : Source_Ptr; RE : RE_Id) return Node_Id is | |
4039 | begin | |
fbf5a39b AC |
4040 | -- If entity is not available, we can skip making the call (this avoids |
4041 | -- junk duplicated error messages in a number of cases). | |
4042 | ||
4043 | if not RTE_Available (RE) then | |
4044 | return Make_Null_Statement (Loc); | |
4045 | else | |
4046 | return | |
4047 | Make_Procedure_Call_Statement (Loc, | |
e4494292 | 4048 | Name => New_Occurrence_Of (RTE (RE), Loc)); |
fbf5a39b | 4049 | end if; |
70482933 RK |
4050 | end Build_Runtime_Call; |
4051 | ||
8e888920 AC |
4052 | ------------------------ |
4053 | -- Build_SS_Mark_Call -- | |
4054 | ------------------------ | |
4055 | ||
4056 | function Build_SS_Mark_Call | |
4057 | (Loc : Source_Ptr; | |
4058 | Mark : Entity_Id) return Node_Id | |
4059 | is | |
4060 | begin | |
4061 | -- Generate: | |
4062 | -- Mark : constant Mark_Id := SS_Mark; | |
4063 | ||
4064 | return | |
4065 | Make_Object_Declaration (Loc, | |
4066 | Defining_Identifier => Mark, | |
4067 | Constant_Present => True, | |
4068 | Object_Definition => | |
4069 | New_Occurrence_Of (RTE (RE_Mark_Id), Loc), | |
4070 | Expression => | |
4071 | Make_Function_Call (Loc, | |
4072 | Name => New_Occurrence_Of (RTE (RE_SS_Mark), Loc))); | |
4073 | end Build_SS_Mark_Call; | |
4074 | ||
4075 | --------------------------- | |
4076 | -- Build_SS_Release_Call -- | |
4077 | --------------------------- | |
4078 | ||
4079 | function Build_SS_Release_Call | |
4080 | (Loc : Source_Ptr; | |
4081 | Mark : Entity_Id) return Node_Id | |
4082 | is | |
4083 | begin | |
4084 | -- Generate: | |
4085 | -- SS_Release (Mark); | |
4086 | ||
4087 | return | |
4088 | Make_Procedure_Call_Statement (Loc, | |
4089 | Name => | |
4090 | New_Occurrence_Of (RTE (RE_SS_Release), Loc), | |
4091 | Parameter_Associations => New_List ( | |
4092 | New_Occurrence_Of (Mark, Loc))); | |
4093 | end Build_SS_Release_Call; | |
4094 | ||
15ce9ca2 AC |
4095 | ---------------------------- |
4096 | -- Build_Task_Array_Image -- | |
4097 | ---------------------------- | |
70482933 RK |
4098 | |
4099 | -- This function generates the body for a function that constructs the | |
4100 | -- image string for a task that is an array component. The function is | |
fbf5a39b | 4101 | -- local to the init proc for the array type, and is called for each one |
70482933 RK |
4102 | -- of the components. The constructed image has the form of an indexed |
4103 | -- component, whose prefix is the outer variable of the array type. | |
3b42c566 | 4104 | -- The n-dimensional array type has known indexes Index, Index2... |
273adcdf | 4105 | |
fbf5a39b | 4106 | -- Id_Ref is an indexed component form created by the enclosing init proc. |
3b42c566 | 4107 | -- Its successive indexes are Val1, Val2, ... which are the loop variables |
fbf5a39b | 4108 | -- in the loops that call the individual task init proc on each component. |
70482933 RK |
4109 | |
4110 | -- The generated function has the following structure: | |
4111 | ||
fbf5a39b AC |
4112 | -- function F return String is |
4113 | -- Pref : string renames Task_Name; | |
4114 | -- T1 : String := Index1'Image (Val1); | |
70482933 | 4115 | -- ... |
fbf5a39b AC |
4116 | -- Tn : String := indexn'image (Valn); |
4117 | -- Len : Integer := T1'Length + ... + Tn'Length + n + 1; | |
70482933 | 4118 | -- -- Len includes commas and the end parentheses. |
fbf5a39b AC |
4119 | -- Res : String (1..Len); |
4120 | -- Pos : Integer := Pref'Length; | |
70482933 RK |
4121 | -- |
4122 | -- begin | |
7bc1c7df | 4123 | -- Res (1 .. Pos) := Pref; |
70482933 RK |
4124 | -- Pos := Pos + 1; |
4125 | -- Res (Pos) := '('; | |
4126 | -- Pos := Pos + 1; | |
4127 | -- Res (Pos .. Pos + T1'Length - 1) := T1; | |
4128 | -- Pos := Pos + T1'Length; | |
4129 | -- Res (Pos) := '.'; | |
4130 | -- Pos := Pos + 1; | |
4131 | -- ... | |
4132 | -- Res (Pos .. Pos + Tn'Length - 1) := Tn; | |
4133 | -- Res (Len) := ')'; | |
4134 | -- | |
fbf5a39b | 4135 | -- return Res; |
70482933 RK |
4136 | -- end F; |
4137 | -- | |
273adcdf AC |
4138 | -- Needless to say, multidimensional arrays of tasks are rare enough that |
4139 | -- the bulkiness of this code is not really a concern. | |
70482933 RK |
4140 | |
4141 | function Build_Task_Array_Image | |
4142 | (Loc : Source_Ptr; | |
4143 | Id_Ref : Node_Id; | |
7bc1c7df | 4144 | A_Type : Entity_Id; |
bebbff91 | 4145 | Dyn : Boolean := False) return Node_Id |
70482933 RK |
4146 | is |
4147 | Dims : constant Nat := Number_Dimensions (A_Type); | |
bebbff91 | 4148 | -- Number of dimensions for array of tasks |
70482933 RK |
4149 | |
4150 | Temps : array (1 .. Dims) of Entity_Id; | |
bebbff91 | 4151 | -- Array of temporaries to hold string for each index |
70482933 RK |
4152 | |
4153 | Indx : Node_Id; | |
4154 | -- Index expression | |
4155 | ||
4156 | Len : Entity_Id; | |
4157 | -- Total length of generated name | |
4158 | ||
4159 | Pos : Entity_Id; | |
4160 | -- Running index for substring assignments | |
4161 | ||
092ef350 | 4162 | Pref : constant Entity_Id := Make_Temporary (Loc, 'P'); |
70482933 RK |
4163 | -- Name of enclosing variable, prefix of resulting name |
4164 | ||
4165 | Res : Entity_Id; | |
4166 | -- String to hold result | |
4167 | ||
4168 | Val : Node_Id; | |
3b42c566 | 4169 | -- Value of successive indexes |
70482933 RK |
4170 | |
4171 | Sum : Node_Id; | |
4172 | -- Expression to compute total size of string | |
4173 | ||
4174 | T : Entity_Id; | |
4175 | -- Entity for name at one index position | |
4176 | ||
86cde7b1 RD |
4177 | Decls : constant List_Id := New_List; |
4178 | Stats : constant List_Id := New_List; | |
70482933 RK |
4179 | |
4180 | begin | |
273adcdf AC |
4181 | -- For a dynamic task, the name comes from the target variable. For a |
4182 | -- static one it is a formal of the enclosing init proc. | |
7bc1c7df ES |
4183 | |
4184 | if Dyn then | |
4185 | Get_Name_String (Chars (Entity (Prefix (Id_Ref)))); | |
fbf5a39b AC |
4186 | Append_To (Decls, |
4187 | Make_Object_Declaration (Loc, | |
4188 | Defining_Identifier => Pref, | |
4189 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), | |
4190 | Expression => | |
bebbff91 AC |
4191 | Make_String_Literal (Loc, |
4192 | Strval => String_From_Name_Buffer))); | |
fbf5a39b | 4193 | |
7bc1c7df | 4194 | else |
fbf5a39b AC |
4195 | Append_To (Decls, |
4196 | Make_Object_Renaming_Declaration (Loc, | |
4197 | Defining_Identifier => Pref, | |
4198 | Subtype_Mark => New_Occurrence_Of (Standard_String, Loc), | |
4199 | Name => Make_Identifier (Loc, Name_uTask_Name))); | |
7bc1c7df | 4200 | end if; |
70482933 | 4201 | |
70482933 RK |
4202 | Indx := First_Index (A_Type); |
4203 | Val := First (Expressions (Id_Ref)); | |
4204 | ||
4205 | for J in 1 .. Dims loop | |
092ef350 | 4206 | T := Make_Temporary (Loc, 'T'); |
70482933 RK |
4207 | Temps (J) := T; |
4208 | ||
4209 | Append_To (Decls, | |
18a2ad5d AC |
4210 | Make_Object_Declaration (Loc, |
4211 | Defining_Identifier => T, | |
4212 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), | |
4213 | Expression => | |
4214 | Make_Attribute_Reference (Loc, | |
4215 | Attribute_Name => Name_Image, | |
4216 | Prefix => New_Occurrence_Of (Etype (Indx), Loc), | |
4217 | Expressions => New_List (New_Copy_Tree (Val))))); | |
70482933 RK |
4218 | |
4219 | Next_Index (Indx); | |
4220 | Next (Val); | |
4221 | end loop; | |
4222 | ||
4223 | Sum := Make_Integer_Literal (Loc, Dims + 1); | |
4224 | ||
4225 | Sum := | |
4226 | Make_Op_Add (Loc, | |
4227 | Left_Opnd => Sum, | |
4228 | Right_Opnd => | |
18a2ad5d AC |
4229 | Make_Attribute_Reference (Loc, |
4230 | Attribute_Name => Name_Length, | |
4231 | Prefix => New_Occurrence_Of (Pref, Loc), | |
4232 | Expressions => New_List (Make_Integer_Literal (Loc, 1)))); | |
70482933 RK |
4233 | |
4234 | for J in 1 .. Dims loop | |
4235 | Sum := | |
18a2ad5d AC |
4236 | Make_Op_Add (Loc, |
4237 | Left_Opnd => Sum, | |
70482933 | 4238 | Right_Opnd => |
18a2ad5d AC |
4239 | Make_Attribute_Reference (Loc, |
4240 | Attribute_Name => Name_Length, | |
4241 | Prefix => | |
70482933 | 4242 | New_Occurrence_Of (Temps (J), Loc), |
18a2ad5d | 4243 | Expressions => New_List (Make_Integer_Literal (Loc, 1)))); |
70482933 RK |
4244 | end loop; |
4245 | ||
7bc1c7df | 4246 | Build_Task_Image_Prefix (Loc, Len, Res, Pos, Pref, Sum, Decls, Stats); |
70482933 RK |
4247 | |
4248 | Set_Character_Literal_Name (Char_Code (Character'Pos ('('))); | |
4249 | ||
4250 | Append_To (Stats, | |
18a2ad5d AC |
4251 | Make_Assignment_Statement (Loc, |
4252 | Name => | |
4253 | Make_Indexed_Component (Loc, | |
4254 | Prefix => New_Occurrence_Of (Res, Loc), | |
70482933 | 4255 | Expressions => New_List (New_Occurrence_Of (Pos, Loc))), |
18a2ad5d AC |
4256 | Expression => |
4257 | Make_Character_Literal (Loc, | |
4258 | Chars => Name_Find, | |
4259 | Char_Literal_Value => UI_From_Int (Character'Pos ('('))))); | |
70482933 RK |
4260 | |
4261 | Append_To (Stats, | |
18a2ad5d AC |
4262 | Make_Assignment_Statement (Loc, |
4263 | Name => New_Occurrence_Of (Pos, Loc), | |
4264 | Expression => | |
4265 | Make_Op_Add (Loc, | |
4266 | Left_Opnd => New_Occurrence_Of (Pos, Loc), | |
4267 | Right_Opnd => Make_Integer_Literal (Loc, 1)))); | |
70482933 RK |
4268 | |
4269 | for J in 1 .. Dims loop | |
4270 | ||
4271 | Append_To (Stats, | |
18a2ad5d AC |
4272 | Make_Assignment_Statement (Loc, |
4273 | Name => | |
4274 | Make_Slice (Loc, | |
4275 | Prefix => New_Occurrence_Of (Res, Loc), | |
70482933 RK |
4276 | Discrete_Range => |
4277 | Make_Range (Loc, | |
18a2ad5d AC |
4278 | Low_Bound => New_Occurrence_Of (Pos, Loc), |
4279 | High_Bound => | |
4280 | Make_Op_Subtract (Loc, | |
4281 | Left_Opnd => | |
4282 | Make_Op_Add (Loc, | |
4283 | Left_Opnd => New_Occurrence_Of (Pos, Loc), | |
4284 | Right_Opnd => | |
4285 | Make_Attribute_Reference (Loc, | |
4286 | Attribute_Name => Name_Length, | |
4287 | Prefix => | |
4288 | New_Occurrence_Of (Temps (J), Loc), | |
4289 | Expressions => | |
4290 | New_List (Make_Integer_Literal (Loc, 1)))), | |
70482933 RK |
4291 | Right_Opnd => Make_Integer_Literal (Loc, 1)))), |
4292 | ||
4293 | Expression => New_Occurrence_Of (Temps (J), Loc))); | |
4294 | ||
4295 | if J < Dims then | |
4296 | Append_To (Stats, | |
4297 | Make_Assignment_Statement (Loc, | |
18a2ad5d | 4298 | Name => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4299 | Expression => |
4300 | Make_Op_Add (Loc, | |
18a2ad5d | 4301 | Left_Opnd => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4302 | Right_Opnd => |
4303 | Make_Attribute_Reference (Loc, | |
4304 | Attribute_Name => Name_Length, | |
18a2ad5d AC |
4305 | Prefix => New_Occurrence_Of (Temps (J), Loc), |
4306 | Expressions => | |
4307 | New_List (Make_Integer_Literal (Loc, 1)))))); | |
70482933 RK |
4308 | |
4309 | Set_Character_Literal_Name (Char_Code (Character'Pos (','))); | |
4310 | ||
4311 | Append_To (Stats, | |
18a2ad5d AC |
4312 | Make_Assignment_Statement (Loc, |
4313 | Name => Make_Indexed_Component (Loc, | |
4314 | Prefix => New_Occurrence_Of (Res, Loc), | |
4315 | Expressions => New_List (New_Occurrence_Of (Pos, Loc))), | |
4316 | Expression => | |
4317 | Make_Character_Literal (Loc, | |
4318 | Chars => Name_Find, | |
4319 | Char_Literal_Value => UI_From_Int (Character'Pos (','))))); | |
70482933 RK |
4320 | |
4321 | Append_To (Stats, | |
4322 | Make_Assignment_Statement (Loc, | |
18a2ad5d | 4323 | Name => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4324 | Expression => |
4325 | Make_Op_Add (Loc, | |
18a2ad5d | 4326 | Left_Opnd => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4327 | Right_Opnd => Make_Integer_Literal (Loc, 1)))); |
4328 | end if; | |
4329 | end loop; | |
4330 | ||
4331 | Set_Character_Literal_Name (Char_Code (Character'Pos (')'))); | |
4332 | ||
4333 | Append_To (Stats, | |
18a2ad5d AC |
4334 | Make_Assignment_Statement (Loc, |
4335 | Name => | |
4336 | Make_Indexed_Component (Loc, | |
4337 | Prefix => New_Occurrence_Of (Res, Loc), | |
70482933 RK |
4338 | Expressions => New_List (New_Occurrence_Of (Len, Loc))), |
4339 | Expression => | |
4340 | Make_Character_Literal (Loc, | |
18a2ad5d AC |
4341 | Chars => Name_Find, |
4342 | Char_Literal_Value => UI_From_Int (Character'Pos (')'))))); | |
70482933 RK |
4343 | return Build_Task_Image_Function (Loc, Decls, Stats, Res); |
4344 | end Build_Task_Array_Image; | |
4345 | ||
4346 | ---------------------------- | |
4347 | -- Build_Task_Image_Decls -- | |
4348 | ---------------------------- | |
4349 | ||
4350 | function Build_Task_Image_Decls | |
05350ac6 BD |
4351 | (Loc : Source_Ptr; |
4352 | Id_Ref : Node_Id; | |
4353 | A_Type : Entity_Id; | |
4354 | In_Init_Proc : Boolean := False) return List_Id | |
70482933 | 4355 | is |
fbf5a39b | 4356 | Decls : constant List_Id := New_List; |
7bc1c7df ES |
4357 | T_Id : Entity_Id := Empty; |
4358 | Decl : Node_Id; | |
7bc1c7df ES |
4359 | Expr : Node_Id := Empty; |
4360 | Fun : Node_Id := Empty; | |
4361 | Is_Dyn : constant Boolean := | |
fbf5a39b AC |
4362 | Nkind (Parent (Id_Ref)) = N_Assignment_Statement |
4363 | and then | |
4364 | Nkind (Expression (Parent (Id_Ref))) = N_Allocator; | |
70482933 RK |
4365 | |
4366 | begin | |
fbf5a39b AC |
4367 | -- If Discard_Names or No_Implicit_Heap_Allocations are in effect, |
4368 | -- generate a dummy declaration only. | |
70482933 | 4369 | |
6e937c1c | 4370 | if Restriction_Active (No_Implicit_Heap_Allocations) |
fbf5a39b AC |
4371 | or else Global_Discard_Names |
4372 | then | |
092ef350 | 4373 | T_Id := Make_Temporary (Loc, 'J'); |
fbf5a39b | 4374 | Name_Len := 0; |
70482933 RK |
4375 | |
4376 | return | |
4377 | New_List ( | |
4378 | Make_Object_Declaration (Loc, | |
4379 | Defining_Identifier => T_Id, | |
fbf5a39b AC |
4380 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), |
4381 | Expression => | |
bebbff91 AC |
4382 | Make_String_Literal (Loc, |
4383 | Strval => String_From_Name_Buffer))); | |
70482933 RK |
4384 | |
4385 | else | |
4386 | if Nkind (Id_Ref) = N_Identifier | |
4387 | or else Nkind (Id_Ref) = N_Defining_Identifier | |
4388 | then | |
523456db | 4389 | -- For a simple variable, the image of the task is built from |
273adcdf AC |
4390 | -- the name of the variable. To avoid possible conflict with the |
4391 | -- anonymous type created for a single protected object, add a | |
4392 | -- numeric suffix. | |
70482933 RK |
4393 | |
4394 | T_Id := | |
4395 | Make_Defining_Identifier (Loc, | |
523456db | 4396 | New_External_Name (Chars (Id_Ref), 'T', 1)); |
70482933 RK |
4397 | |
4398 | Get_Name_String (Chars (Id_Ref)); | |
4399 | ||
bebbff91 AC |
4400 | Expr := |
4401 | Make_String_Literal (Loc, | |
4402 | Strval => String_From_Name_Buffer); | |
70482933 RK |
4403 | |
4404 | elsif Nkind (Id_Ref) = N_Selected_Component then | |
4405 | T_Id := | |
4406 | Make_Defining_Identifier (Loc, | |
fbf5a39b | 4407 | New_External_Name (Chars (Selector_Name (Id_Ref)), 'T')); |
07fc65c4 | 4408 | Fun := Build_Task_Record_Image (Loc, Id_Ref, Is_Dyn); |
70482933 RK |
4409 | |
4410 | elsif Nkind (Id_Ref) = N_Indexed_Component then | |
4411 | T_Id := | |
4412 | Make_Defining_Identifier (Loc, | |
fbf5a39b | 4413 | New_External_Name (Chars (A_Type), 'N')); |
70482933 | 4414 | |
7bc1c7df | 4415 | Fun := Build_Task_Array_Image (Loc, Id_Ref, A_Type, Is_Dyn); |
70482933 RK |
4416 | end if; |
4417 | end if; | |
4418 | ||
4419 | if Present (Fun) then | |
4420 | Append (Fun, Decls); | |
fbf5a39b AC |
4421 | Expr := Make_Function_Call (Loc, |
4422 | Name => New_Occurrence_Of (Defining_Entity (Fun), Loc)); | |
05350ac6 | 4423 | |
535a8637 | 4424 | if not In_Init_Proc then |
05350ac6 BD |
4425 | Set_Uses_Sec_Stack (Defining_Entity (Fun)); |
4426 | end if; | |
70482933 RK |
4427 | end if; |
4428 | ||
4429 | Decl := Make_Object_Declaration (Loc, | |
4430 | Defining_Identifier => T_Id, | |
fbf5a39b AC |
4431 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), |
4432 | Constant_Present => True, | |
4433 | Expression => Expr); | |
70482933 RK |
4434 | |
4435 | Append (Decl, Decls); | |
4436 | return Decls; | |
4437 | end Build_Task_Image_Decls; | |
4438 | ||
4439 | ------------------------------- | |
4440 | -- Build_Task_Image_Function -- | |
4441 | ------------------------------- | |
4442 | ||
4443 | function Build_Task_Image_Function | |
4444 | (Loc : Source_Ptr; | |
4445 | Decls : List_Id; | |
4446 | Stats : List_Id; | |
bebbff91 | 4447 | Res : Entity_Id) return Node_Id |
70482933 RK |
4448 | is |
4449 | Spec : Node_Id; | |
4450 | ||
4451 | begin | |
4452 | Append_To (Stats, | |
86cde7b1 | 4453 | Make_Simple_Return_Statement (Loc, |
fbf5a39b AC |
4454 | Expression => New_Occurrence_Of (Res, Loc))); |
4455 | ||
4456 | Spec := Make_Function_Specification (Loc, | |
092ef350 RD |
4457 | Defining_Unit_Name => Make_Temporary (Loc, 'F'), |
4458 | Result_Definition => New_Occurrence_Of (Standard_String, Loc)); | |
fbf5a39b | 4459 | |
273adcdf AC |
4460 | -- Calls to 'Image use the secondary stack, which must be cleaned up |
4461 | -- after the task name is built. | |
fbf5a39b | 4462 | |
70482933 RK |
4463 | return Make_Subprogram_Body (Loc, |
4464 | Specification => Spec, | |
4465 | Declarations => Decls, | |
4466 | Handled_Statement_Sequence => | |
fbf5a39b | 4467 | Make_Handled_Sequence_Of_Statements (Loc, Statements => Stats)); |
70482933 RK |
4468 | end Build_Task_Image_Function; |
4469 | ||
4470 | ----------------------------- | |
4471 | -- Build_Task_Image_Prefix -- | |
4472 | ----------------------------- | |
4473 | ||
4474 | procedure Build_Task_Image_Prefix | |
4475 | (Loc : Source_Ptr; | |
4476 | Len : out Entity_Id; | |
4477 | Res : out Entity_Id; | |
4478 | Pos : out Entity_Id; | |
4479 | Prefix : Entity_Id; | |
4480 | Sum : Node_Id; | |
86cde7b1 RD |
4481 | Decls : List_Id; |
4482 | Stats : List_Id) | |
70482933 RK |
4483 | is |
4484 | begin | |
092ef350 | 4485 | Len := Make_Temporary (Loc, 'L', Sum); |
70482933 RK |
4486 | |
4487 | Append_To (Decls, | |
4488 | Make_Object_Declaration (Loc, | |
4489 | Defining_Identifier => Len, | |
092ef350 RD |
4490 | Object_Definition => New_Occurrence_Of (Standard_Integer, Loc), |
4491 | Expression => Sum)); | |
70482933 | 4492 | |
092ef350 | 4493 | Res := Make_Temporary (Loc, 'R'); |
70482933 RK |
4494 | |
4495 | Append_To (Decls, | |
4496 | Make_Object_Declaration (Loc, | |
4497 | Defining_Identifier => Res, | |
4498 | Object_Definition => | |
4499 | Make_Subtype_Indication (Loc, | |
4500 | Subtype_Mark => New_Occurrence_Of (Standard_String, Loc), | |
4501 | Constraint => | |
4502 | Make_Index_Or_Discriminant_Constraint (Loc, | |
4503 | Constraints => | |
4504 | New_List ( | |
4505 | Make_Range (Loc, | |
4506 | Low_Bound => Make_Integer_Literal (Loc, 1), | |
4507 | High_Bound => New_Occurrence_Of (Len, Loc))))))); | |
4508 | ||
f90d14ac AC |
4509 | -- Indicate that the result is an internal temporary, so it does not |
4510 | -- receive a bogus initialization when declaration is expanded. This | |
4511 | -- is both efficient, and prevents anomalies in the handling of | |
4512 | -- dynamic objects on the secondary stack. | |
4513 | ||
4514 | Set_Is_Internal (Res); | |
092ef350 | 4515 | Pos := Make_Temporary (Loc, 'P'); |
70482933 RK |
4516 | |
4517 | Append_To (Decls, | |
4518 | Make_Object_Declaration (Loc, | |
4519 | Defining_Identifier => Pos, | |
092ef350 | 4520 | Object_Definition => New_Occurrence_Of (Standard_Integer, Loc))); |
70482933 RK |
4521 | |
4522 | -- Pos := Prefix'Length; | |
4523 | ||
4524 | Append_To (Stats, | |
4525 | Make_Assignment_Statement (Loc, | |
4526 | Name => New_Occurrence_Of (Pos, Loc), | |
4527 | Expression => | |
4528 | Make_Attribute_Reference (Loc, | |
4529 | Attribute_Name => Name_Length, | |
092ef350 RD |
4530 | Prefix => New_Occurrence_Of (Prefix, Loc), |
4531 | Expressions => New_List (Make_Integer_Literal (Loc, 1))))); | |
70482933 RK |
4532 | |
4533 | -- Res (1 .. Pos) := Prefix; | |
4534 | ||
4535 | Append_To (Stats, | |
092ef350 RD |
4536 | Make_Assignment_Statement (Loc, |
4537 | Name => | |
4538 | Make_Slice (Loc, | |
4539 | Prefix => New_Occurrence_Of (Res, Loc), | |
70482933 RK |
4540 | Discrete_Range => |
4541 | Make_Range (Loc, | |
092ef350 | 4542 | Low_Bound => Make_Integer_Literal (Loc, 1), |
70482933 RK |
4543 | High_Bound => New_Occurrence_Of (Pos, Loc))), |
4544 | ||
092ef350 | 4545 | Expression => New_Occurrence_Of (Prefix, Loc))); |
70482933 RK |
4546 | |
4547 | Append_To (Stats, | |
4548 | Make_Assignment_Statement (Loc, | |
092ef350 | 4549 | Name => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4550 | Expression => |
4551 | Make_Op_Add (Loc, | |
092ef350 | 4552 | Left_Opnd => New_Occurrence_Of (Pos, Loc), |
70482933 RK |
4553 | Right_Opnd => Make_Integer_Literal (Loc, 1)))); |
4554 | end Build_Task_Image_Prefix; | |
4555 | ||
4556 | ----------------------------- | |
4557 | -- Build_Task_Record_Image -- | |
4558 | ----------------------------- | |
4559 | ||
4560 | function Build_Task_Record_Image | |
4561 | (Loc : Source_Ptr; | |
4562 | Id_Ref : Node_Id; | |
bebbff91 | 4563 | Dyn : Boolean := False) return Node_Id |
70482933 RK |
4564 | is |
4565 | Len : Entity_Id; | |
4566 | -- Total length of generated name | |
4567 | ||
4568 | Pos : Entity_Id; | |
4569 | -- Index into result | |
4570 | ||
4571 | Res : Entity_Id; | |
4572 | -- String to hold result | |
4573 | ||
092ef350 | 4574 | Pref : constant Entity_Id := Make_Temporary (Loc, 'P'); |
70482933 RK |
4575 | -- Name of enclosing variable, prefix of resulting name |
4576 | ||
4577 | Sum : Node_Id; | |
bebbff91 | 4578 | -- Expression to compute total size of string |
70482933 RK |
4579 | |
4580 | Sel : Entity_Id; | |
4581 | -- Entity for selector name | |
4582 | ||
86cde7b1 RD |
4583 | Decls : constant List_Id := New_List; |
4584 | Stats : constant List_Id := New_List; | |
70482933 RK |
4585 | |
4586 | begin | |
aa9a7dd7 AC |
4587 | -- For a dynamic task, the name comes from the target variable. For a |
4588 | -- static one it is a formal of the enclosing init proc. | |
7bc1c7df ES |
4589 | |
4590 | if Dyn then | |
4591 | Get_Name_String (Chars (Entity (Prefix (Id_Ref)))); | |
fbf5a39b AC |
4592 | Append_To (Decls, |
4593 | Make_Object_Declaration (Loc, | |
4594 | Defining_Identifier => Pref, | |
4595 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), | |
4596 | Expression => | |
bebbff91 AC |
4597 | Make_String_Literal (Loc, |
4598 | Strval => String_From_Name_Buffer))); | |
fbf5a39b | 4599 | |
7bc1c7df | 4600 | else |
fbf5a39b AC |
4601 | Append_To (Decls, |
4602 | Make_Object_Renaming_Declaration (Loc, | |
4603 | Defining_Identifier => Pref, | |
4604 | Subtype_Mark => New_Occurrence_Of (Standard_String, Loc), | |
4605 | Name => Make_Identifier (Loc, Name_uTask_Name))); | |
7bc1c7df | 4606 | end if; |
70482933 | 4607 | |
092ef350 | 4608 | Sel := Make_Temporary (Loc, 'S'); |
70482933 RK |
4609 | |
4610 | Get_Name_String (Chars (Selector_Name (Id_Ref))); | |
4611 | ||
4612 | Append_To (Decls, | |
4613 | Make_Object_Declaration (Loc, | |
4614 | Defining_Identifier => Sel, | |
092ef350 RD |
4615 | Object_Definition => New_Occurrence_Of (Standard_String, Loc), |
4616 | Expression => | |
bebbff91 AC |
4617 | Make_String_Literal (Loc, |
4618 | Strval => String_From_Name_Buffer))); | |
70482933 RK |
4619 | |
4620 | Sum := Make_Integer_Literal (Loc, Nat (Name_Len + 1)); | |
4621 | ||
4622 | Sum := | |
4623 | Make_Op_Add (Loc, | |
4624 | Left_Opnd => Sum, | |
4625 | Right_Opnd => | |
4626 | Make_Attribute_Reference (Loc, | |
4627 | Attribute_Name => Name_Length, | |
4628 | Prefix => | |
7bc1c7df | 4629 | New_Occurrence_Of (Pref, Loc), |
70482933 RK |
4630 | Expressions => New_List (Make_Integer_Literal (Loc, 1)))); |
4631 | ||
7bc1c7df | 4632 | Build_Task_Image_Prefix (Loc, Len, Res, Pos, Pref, Sum, Decls, Stats); |
70482933 RK |
4633 | |
4634 | Set_Character_Literal_Name (Char_Code (Character'Pos ('.'))); | |
4635 | ||
4636 | -- Res (Pos) := '.'; | |
4637 | ||
4638 | Append_To (Stats, | |
4639 | Make_Assignment_Statement (Loc, | |
4640 | Name => Make_Indexed_Component (Loc, | |
4641 | Prefix => New_Occurrence_Of (Res, Loc), | |
4642 | Expressions => New_List (New_Occurrence_Of (Pos, Loc))), | |
4643 | Expression => | |
4644 | Make_Character_Literal (Loc, | |
4645 | Chars => Name_Find, | |
4646 | Char_Literal_Value => | |
82c80734 | 4647 | UI_From_Int (Character'Pos ('.'))))); |
70482933 RK |
4648 | |
4649 | Append_To (Stats, | |
4650 | Make_Assignment_Statement (Loc, | |
4651 | Name => New_Occurrence_Of (Pos, Loc), | |
4652 | Expression => | |
4653 | Make_Op_Add (Loc, | |
4654 | Left_Opnd => New_Occurrence_Of (Pos, Loc), | |
4655 | Right_Opnd => Make_Integer_Literal (Loc, 1)))); | |
4656 | ||
4657 | -- Res (Pos .. Len) := Selector; | |
4658 | ||
4659 | Append_To (Stats, | |
4660 | Make_Assignment_Statement (Loc, | |
4661 | Name => Make_Slice (Loc, | |
4662 | Prefix => New_Occurrence_Of (Res, Loc), | |
4663 | Discrete_Range => | |
4664 | Make_Range (Loc, | |
4665 | Low_Bound => New_Occurrence_Of (Pos, Loc), | |
4666 | High_Bound => New_Occurrence_Of (Len, Loc))), | |
4667 | Expression => New_Occurrence_Of (Sel, Loc))); | |
4668 | ||
4669 | return Build_Task_Image_Function (Loc, Decls, Stats, Res); | |
4670 | end Build_Task_Record_Image; | |
4671 | ||
937e9676 AC |
4672 | --------------------------------------- |
4673 | -- Build_Transient_Object_Statements -- | |
4674 | --------------------------------------- | |
4675 | ||
4676 | procedure Build_Transient_Object_Statements | |
4677 | (Obj_Decl : Node_Id; | |
4678 | Fin_Call : out Node_Id; | |
4679 | Hook_Assign : out Node_Id; | |
4680 | Hook_Clear : out Node_Id; | |
4681 | Hook_Decl : out Node_Id; | |
4682 | Ptr_Decl : out Node_Id; | |
4683 | Finalize_Obj : Boolean := True) | |
4684 | is | |
4685 | Loc : constant Source_Ptr := Sloc (Obj_Decl); | |
4686 | Obj_Id : constant Entity_Id := Defining_Entity (Obj_Decl); | |
4687 | Obj_Typ : constant Entity_Id := Base_Type (Etype (Obj_Id)); | |
4688 | ||
4689 | Desig_Typ : Entity_Id; | |
4690 | Hook_Expr : Node_Id; | |
4691 | Hook_Id : Entity_Id; | |
4692 | Obj_Ref : Node_Id; | |
4693 | Ptr_Typ : Entity_Id; | |
4694 | ||
4695 | begin | |
4696 | -- Recover the type of the object | |
4697 | ||
4698 | Desig_Typ := Obj_Typ; | |
4699 | ||
4700 | if Is_Access_Type (Desig_Typ) then | |
4701 | Desig_Typ := Available_View (Designated_Type (Desig_Typ)); | |
4702 | end if; | |
4703 | ||
4704 | -- Create an access type which provides a reference to the transient | |
4705 | -- object. Generate: | |
4706 | ||
4707 | -- type Ptr_Typ is access all Desig_Typ; | |
4708 | ||
4709 | Ptr_Typ := Make_Temporary (Loc, 'A'); | |
4710 | Set_Ekind (Ptr_Typ, E_General_Access_Type); | |
4711 | Set_Directly_Designated_Type (Ptr_Typ, Desig_Typ); | |
4712 | ||
4713 | Ptr_Decl := | |
4714 | Make_Full_Type_Declaration (Loc, | |
4715 | Defining_Identifier => Ptr_Typ, | |
4716 | Type_Definition => | |
4717 | Make_Access_To_Object_Definition (Loc, | |
4718 | All_Present => True, | |
4719 | Subtype_Indication => New_Occurrence_Of (Desig_Typ, Loc))); | |
4720 | ||
4721 | -- Create a temporary check which acts as a hook to the transient | |
4722 | -- object. Generate: | |
4723 | ||
4724 | -- Hook : Ptr_Typ := null; | |
4725 | ||
4726 | Hook_Id := Make_Temporary (Loc, 'T'); | |
4727 | Set_Ekind (Hook_Id, E_Variable); | |
4728 | Set_Etype (Hook_Id, Ptr_Typ); | |
4729 | ||
4730 | Hook_Decl := | |
4731 | Make_Object_Declaration (Loc, | |
4732 | Defining_Identifier => Hook_Id, | |
4733 | Object_Definition => New_Occurrence_Of (Ptr_Typ, Loc), | |
4734 | Expression => Make_Null (Loc)); | |
4735 | ||
4736 | -- Mark the temporary as a hook. This signals the machinery in | |
4737 | -- Build_Finalizer to recognize this special case. | |
4738 | ||
4739 | Set_Status_Flag_Or_Transient_Decl (Hook_Id, Obj_Decl); | |
4740 | ||
4741 | -- Hook the transient object to the temporary. Generate: | |
4742 | ||
4743 | -- Hook := Ptr_Typ (Obj_Id); | |
4744 | -- <or> | |
4745 | -- Hool := Obj_Id'Unrestricted_Access; | |
4746 | ||
4747 | if Is_Access_Type (Obj_Typ) then | |
4748 | Hook_Expr := | |
4749 | Unchecked_Convert_To (Ptr_Typ, New_Occurrence_Of (Obj_Id, Loc)); | |
4750 | else | |
4751 | Hook_Expr := | |
4752 | Make_Attribute_Reference (Loc, | |
4753 | Prefix => New_Occurrence_Of (Obj_Id, Loc), | |
4754 | Attribute_Name => Name_Unrestricted_Access); | |
4755 | end if; | |
4756 | ||
4757 | Hook_Assign := | |
4758 | Make_Assignment_Statement (Loc, | |
4759 | Name => New_Occurrence_Of (Hook_Id, Loc), | |
4760 | Expression => Hook_Expr); | |
4761 | ||
4762 | -- Crear the hook prior to finalizing the object. Generate: | |
4763 | ||
4764 | -- Hook := null; | |
4765 | ||
4766 | Hook_Clear := | |
4767 | Make_Assignment_Statement (Loc, | |
4768 | Name => New_Occurrence_Of (Hook_Id, Loc), | |
4769 | Expression => Make_Null (Loc)); | |
4770 | ||
4771 | -- Finalize the object. Generate: | |
4772 | ||
4773 | -- [Deep_]Finalize (Obj_Ref[.all]); | |
4774 | ||
4775 | if Finalize_Obj then | |
4776 | Obj_Ref := New_Occurrence_Of (Obj_Id, Loc); | |
4777 | ||
4778 | if Is_Access_Type (Obj_Typ) then | |
4779 | Obj_Ref := Make_Explicit_Dereference (Loc, Obj_Ref); | |
4780 | Set_Etype (Obj_Ref, Desig_Typ); | |
4781 | end if; | |
4782 | ||
2168d7cc AC |
4783 | Fin_Call := |
4784 | Make_Final_Call | |
4785 | (Obj_Ref => Obj_Ref, | |
4786 | Typ => Desig_Typ); | |
937e9676 AC |
4787 | |
4788 | -- Otherwise finalize the hook. Generate: | |
4789 | ||
4790 | -- [Deep_]Finalize (Hook.all); | |
4791 | ||
4792 | else | |
4793 | Fin_Call := | |
4794 | Make_Final_Call ( | |
4795 | Obj_Ref => | |
4796 | Make_Explicit_Dereference (Loc, | |
4797 | Prefix => New_Occurrence_Of (Hook_Id, Loc)), | |
4798 | Typ => Desig_Typ); | |
4799 | end if; | |
4800 | end Build_Transient_Object_Statements; | |
4801 | ||
d26d790d AC |
4802 | ----------------------------- |
4803 | -- Check_Float_Op_Overflow -- | |
4804 | ----------------------------- | |
4805 | ||
4806 | procedure Check_Float_Op_Overflow (N : Node_Id) is | |
4807 | begin | |
4808 | -- Return if no check needed | |
4809 | ||
bb304287 AC |
4810 | if not Is_Floating_Point_Type (Etype (N)) |
4811 | or else not (Do_Overflow_Check (N) and then Check_Float_Overflow) | |
d26d790d | 4812 | |
af6478c8 | 4813 | -- In CodePeer_Mode, rely on the overflow check flag being set instead |
bb304287 | 4814 | -- and do not expand the code for float overflow checking. |
e943fe8a | 4815 | |
af6478c8 AC |
4816 | or else CodePeer_Mode |
4817 | then | |
4818 | return; | |
e943fe8a AC |
4819 | end if; |
4820 | ||
d26d790d AC |
4821 | -- Otherwise we replace the expression by |
4822 | ||
4823 | -- do Tnn : constant ftype := expression; | |
4824 | -- constraint_error when not Tnn'Valid; | |
4825 | -- in Tnn; | |
4826 | ||
4827 | declare | |
4828 | Loc : constant Source_Ptr := Sloc (N); | |
4829 | Tnn : constant Entity_Id := Make_Temporary (Loc, 'T', N); | |
4830 | Typ : constant Entity_Id := Etype (N); | |
4831 | ||
4832 | begin | |
bb304287 AC |
4833 | -- Turn off the Do_Overflow_Check flag, since we are doing that work |
4834 | -- right here. We also set the node as analyzed to prevent infinite | |
4835 | -- recursion from repeating the operation in the expansion. | |
d26d790d | 4836 | |
bb304287 AC |
4837 | Set_Do_Overflow_Check (N, False); |
4838 | Set_Analyzed (N, True); | |
d26d790d AC |
4839 | |
4840 | -- Do the rewrite to include the check | |
4841 | ||
4842 | Rewrite (N, | |
4843 | Make_Expression_With_Actions (Loc, | |
4844 | Actions => New_List ( | |
4845 | Make_Object_Declaration (Loc, | |
4846 | Defining_Identifier => Tnn, | |
4847 | Object_Definition => New_Occurrence_Of (Typ, Loc), | |
4848 | Constant_Present => True, | |
4849 | Expression => Relocate_Node (N)), | |
4850 | Make_Raise_Constraint_Error (Loc, | |
4851 | Condition => | |
4852 | Make_Op_Not (Loc, | |
4853 | Right_Opnd => | |
4854 | Make_Attribute_Reference (Loc, | |
4855 | Prefix => New_Occurrence_Of (Tnn, Loc), | |
4856 | Attribute_Name => Name_Valid)), | |
4857 | Reason => CE_Overflow_Check_Failed)), | |
4858 | Expression => New_Occurrence_Of (Tnn, Loc))); | |
4859 | ||
4860 | Analyze_And_Resolve (N, Typ); | |
4861 | end; | |
4862 | end Check_Float_Op_Overflow; | |
4863 | ||
91b1417d AC |
4864 | ---------------------------------- |
4865 | -- Component_May_Be_Bit_Aligned -- | |
4866 | ---------------------------------- | |
4867 | ||
4868 | function Component_May_Be_Bit_Aligned (Comp : Entity_Id) return Boolean is | |
c97c0163 | 4869 | UT : Entity_Id; |
6fb4cdde | 4870 | |
91b1417d | 4871 | begin |
dc7c0c4d | 4872 | -- If no component clause, then everything is fine, since the back end |
fba9fcae EB |
4873 | -- never misaligns from byte boundaries by default, even if there is a |
4874 | -- pragma Pack for the record. | |
91b1417d | 4875 | |
c97c0163 | 4876 | if No (Comp) or else No (Component_Clause (Comp)) then |
91b1417d AC |
4877 | return False; |
4878 | end if; | |
4879 | ||
c97c0163 AC |
4880 | UT := Underlying_Type (Etype (Comp)); |
4881 | ||
91b1417d AC |
4882 | -- It is only array and record types that cause trouble |
4883 | ||
0e564ab4 | 4884 | if not Is_Record_Type (UT) and then not Is_Array_Type (UT) then |
91b1417d AC |
4885 | return False; |
4886 | ||
c7c7dd3a EB |
4887 | -- If we know that we have a small (at most the maximum integer size) |
4888 | -- record or bit-packed array, then everything is fine, since the back | |
4889 | -- end can handle these cases correctly. | |
91b1417d | 4890 | |
c7c7dd3a | 4891 | elsif Esize (Comp) <= System_Max_Integer_Size |
0e564ab4 | 4892 | and then (Is_Record_Type (UT) or else Is_Bit_Packed_Array (UT)) |
91b1417d AC |
4893 | then |
4894 | return False; | |
4895 | ||
dc7c0c4d AC |
4896 | -- Otherwise if the component is not byte aligned, we know we have the |
4897 | -- nasty unaligned case. | |
91b1417d AC |
4898 | |
4899 | elsif Normalized_First_Bit (Comp) /= Uint_0 | |
4900 | or else Esize (Comp) mod System_Storage_Unit /= Uint_0 | |
4901 | then | |
4902 | return True; | |
4903 | ||
4904 | -- If we are large and byte aligned, then OK at this level | |
4905 | ||
4906 | else | |
4907 | return False; | |
4908 | end if; | |
4909 | end Component_May_Be_Bit_Aligned; | |
4910 | ||
1e3ed0fc RD |
4911 | ------------------------------- |
4912 | -- Convert_To_Actual_Subtype -- | |
4913 | ------------------------------- | |
4914 | ||
4915 | procedure Convert_To_Actual_Subtype (Exp : Entity_Id) is | |
4916 | Act_ST : Entity_Id; | |
4917 | ||
4918 | begin | |
4919 | Act_ST := Get_Actual_Subtype (Exp); | |
4920 | ||
4921 | if Act_ST = Etype (Exp) then | |
4922 | return; | |
4923 | else | |
4924 | Rewrite (Exp, Convert_To (Act_ST, Relocate_Node (Exp))); | |
4925 | Analyze_And_Resolve (Exp, Act_ST); | |
4926 | end if; | |
4927 | end Convert_To_Actual_Subtype; | |
4928 | ||
1923d2d6 JM |
4929 | ----------------------------------- |
4930 | -- Corresponding_Runtime_Package -- | |
4931 | ----------------------------------- | |
4932 | ||
4933 | function Corresponding_Runtime_Package (Typ : Entity_Id) return RTU_Id is | |
ac8380d5 AC |
4934 | function Has_One_Entry_And_No_Queue (T : Entity_Id) return Boolean; |
4935 | -- Return True if protected type T has one entry and the maximum queue | |
4936 | -- length is one. | |
4937 | ||
4938 | -------------------------------- | |
4939 | -- Has_One_Entry_And_No_Queue -- | |
4940 | -------------------------------- | |
4941 | ||
4942 | function Has_One_Entry_And_No_Queue (T : Entity_Id) return Boolean is | |
6413509b | 4943 | Item : Entity_Id; |
ac8380d5 | 4944 | Is_First : Boolean := True; |
6413509b | 4945 | |
ac8380d5 | 4946 | begin |
6413509b AC |
4947 | Item := First_Entity (T); |
4948 | while Present (Item) loop | |
4949 | if Is_Entry (Item) then | |
ac8380d5 | 4950 | |
6413509b AC |
4951 | -- The protected type has more than one entry |
4952 | ||
4953 | if not Is_First then | |
ac8380d5 AC |
4954 | return False; |
4955 | end if; | |
4956 | ||
6413509b AC |
4957 | -- The queue length is not one |
4958 | ||
ac8380d5 | 4959 | if not Restriction_Active (No_Entry_Queue) |
6413509b | 4960 | and then Get_Max_Queue_Length (Item) /= Uint_1 |
ac8380d5 | 4961 | then |
ac8380d5 AC |
4962 | return False; |
4963 | end if; | |
4964 | ||
4965 | Is_First := False; | |
4966 | end if; | |
4967 | ||
6413509b | 4968 | Next_Entity (Item); |
ac8380d5 AC |
4969 | end loop; |
4970 | ||
4971 | return True; | |
4972 | end Has_One_Entry_And_No_Queue; | |
4973 | ||
6413509b AC |
4974 | -- Local variables |
4975 | ||
1923d2d6 JM |
4976 | Pkg_Id : RTU_Id := RTU_Null; |
4977 | ||
6413509b AC |
4978 | -- Start of processing for Corresponding_Runtime_Package |
4979 | ||
1923d2d6 JM |
4980 | begin |
4981 | pragma Assert (Is_Concurrent_Type (Typ)); | |
4982 | ||
5188952e | 4983 | if Is_Protected_Type (Typ) then |
1923d2d6 | 4984 | if Has_Entries (Typ) |
65df5b71 HK |
4985 | |
4986 | -- A protected type without entries that covers an interface and | |
4987 | -- overrides the abstract routines with protected procedures is | |
4988 | -- considered equivalent to a protected type with entries in the | |
f3d0f304 | 4989 | -- context of dispatching select statements. It is sufficient to |
65df5b71 HK |
4990 | -- check for the presence of an interface list in the declaration |
4991 | -- node to recognize this case. | |
4992 | ||
4993 | or else Present (Interface_List (Parent (Typ))) | |
27a8f150 AC |
4994 | |
4995 | -- Protected types with interrupt handlers (when not using a | |
4996 | -- restricted profile) are also considered equivalent to | |
4997 | -- protected types with entries. The types which are used | |
4998 | -- (Static_Interrupt_Protection and Dynamic_Interrupt_Protection) | |
4999 | -- are derived from Protection_Entries. | |
5000 | ||
5001 | or else (Has_Attach_Handler (Typ) and then not Restricted_Profile) | |
5002 | or else Has_Interrupt_Handler (Typ) | |
1923d2d6 JM |
5003 | then |
5004 | if Abort_Allowed | |
a54ffd6c | 5005 | or else Restriction_Active (No_Select_Statements) = False |
ac8380d5 | 5006 | or else not Has_One_Entry_And_No_Queue (Typ) |
1923d2d6 | 5007 | or else (Has_Attach_Handler (Typ) |
dc36a7e3 | 5008 | and then not Restricted_Profile) |
1923d2d6 JM |
5009 | then |
5010 | Pkg_Id := System_Tasking_Protected_Objects_Entries; | |
5011 | else | |
5012 | Pkg_Id := System_Tasking_Protected_Objects_Single_Entry; | |
5013 | end if; | |
5014 | ||
5015 | else | |
5016 | Pkg_Id := System_Tasking_Protected_Objects; | |
5017 | end if; | |
5018 | end if; | |
5019 | ||
5020 | return Pkg_Id; | |
5021 | end Corresponding_Runtime_Package; | |
5022 | ||
70482933 RK |
5023 | ----------------------------------- |
5024 | -- Current_Sem_Unit_Declarations -- | |
5025 | ----------------------------------- | |
5026 | ||
5027 | function Current_Sem_Unit_Declarations return List_Id is | |
5028 | U : Node_Id := Unit (Cunit (Current_Sem_Unit)); | |
5029 | Decls : List_Id; | |
5030 | ||
5031 | begin | |
5032 | -- If the current unit is a package body, locate the visible | |
5033 | -- declarations of the package spec. | |
5034 | ||
5035 | if Nkind (U) = N_Package_Body then | |
5036 | U := Unit (Library_Unit (Cunit (Current_Sem_Unit))); | |
5037 | end if; | |
5038 | ||
5039 | if Nkind (U) = N_Package_Declaration then | |
5040 | U := Specification (U); | |
5041 | Decls := Visible_Declarations (U); | |
5042 | ||
5043 | if No (Decls) then | |
5044 | Decls := New_List; | |
5045 | Set_Visible_Declarations (U, Decls); | |
5046 | end if; | |
5047 | ||
5048 | else | |
5049 | Decls := Declarations (U); | |
5050 | ||
5051 | if No (Decls) then | |
5052 | Decls := New_List; | |
5053 | Set_Declarations (U, Decls); | |
5054 | end if; | |
5055 | end if; | |
5056 | ||
5057 | return Decls; | |
5058 | end Current_Sem_Unit_Declarations; | |
5059 | ||
5060 | ----------------------- | |
5061 | -- Duplicate_Subexpr -- | |
5062 | ----------------------- | |
5063 | ||
5064 | function Duplicate_Subexpr | |
a43f6434 AC |
5065 | (Exp : Node_Id; |
5066 | Name_Req : Boolean := False; | |
5067 | Renaming_Req : Boolean := False) return Node_Id | |
70482933 RK |
5068 | is |
5069 | begin | |
a43f6434 | 5070 | Remove_Side_Effects (Exp, Name_Req, Renaming_Req); |
70482933 RK |
5071 | return New_Copy_Tree (Exp); |
5072 | end Duplicate_Subexpr; | |
5073 | ||
8cbb664e MG |
5074 | --------------------------------- |
5075 | -- Duplicate_Subexpr_No_Checks -- | |
5076 | --------------------------------- | |
5077 | ||
5078 | function Duplicate_Subexpr_No_Checks | |
2934b84a AC |
5079 | (Exp : Node_Id; |
5080 | Name_Req : Boolean := False; | |
5081 | Renaming_Req : Boolean := False; | |
5082 | Related_Id : Entity_Id := Empty; | |
5083 | Is_Low_Bound : Boolean := False; | |
5084 | Is_High_Bound : Boolean := False) return Node_Id | |
8cbb664e MG |
5085 | is |
5086 | New_Exp : Node_Id; | |
a43f6434 | 5087 | |
8cbb664e | 5088 | begin |
2934b84a AC |
5089 | Remove_Side_Effects |
5090 | (Exp => Exp, | |
5091 | Name_Req => Name_Req, | |
5092 | Renaming_Req => Renaming_Req, | |
5093 | Related_Id => Related_Id, | |
5094 | Is_Low_Bound => Is_Low_Bound, | |
5095 | Is_High_Bound => Is_High_Bound); | |
5096 | ||
8cbb664e MG |
5097 | New_Exp := New_Copy_Tree (Exp); |
5098 | Remove_Checks (New_Exp); | |
5099 | return New_Exp; | |
5100 | end Duplicate_Subexpr_No_Checks; | |
5101 | ||
5102 | ----------------------------------- | |
5103 | -- Duplicate_Subexpr_Move_Checks -- | |
5104 | ----------------------------------- | |
5105 | ||
5106 | function Duplicate_Subexpr_Move_Checks | |
a43f6434 AC |
5107 | (Exp : Node_Id; |
5108 | Name_Req : Boolean := False; | |
5109 | Renaming_Req : Boolean := False) return Node_Id | |
8cbb664e MG |
5110 | is |
5111 | New_Exp : Node_Id; | |
a43f6434 | 5112 | |
8cbb664e | 5113 | begin |
a43f6434 | 5114 | Remove_Side_Effects (Exp, Name_Req, Renaming_Req); |
8cbb664e MG |
5115 | New_Exp := New_Copy_Tree (Exp); |
5116 | Remove_Checks (Exp); | |
5117 | return New_Exp; | |
5118 | end Duplicate_Subexpr_Move_Checks; | |
5119 | ||
341e0bb6 JS |
5120 | ------------------------- |
5121 | -- Enclosing_Init_Proc -- | |
5122 | ------------------------- | |
5123 | ||
5124 | function Enclosing_Init_Proc return Entity_Id is | |
5125 | S : Entity_Id; | |
5126 | ||
5127 | begin | |
5128 | S := Current_Scope; | |
5129 | while Present (S) and then S /= Standard_Standard loop | |
5130 | if Is_Init_Proc (S) then | |
5131 | return S; | |
5132 | else | |
5133 | S := Scope (S); | |
5134 | end if; | |
5135 | end loop; | |
5136 | ||
5137 | return Empty; | |
5138 | end Enclosing_Init_Proc; | |
5139 | ||
70482933 RK |
5140 | -------------------- |
5141 | -- Ensure_Defined -- | |
5142 | -------------------- | |
5143 | ||
5144 | procedure Ensure_Defined (Typ : Entity_Id; N : Node_Id) is | |
5145 | IR : Node_Id; | |
70482933 RK |
5146 | |
5147 | begin | |
aa9a7dd7 AC |
5148 | -- An itype reference must only be created if this is a local itype, so |
5149 | -- that gigi can elaborate it on the proper objstack. | |
86cde7b1 | 5150 | |
0e564ab4 | 5151 | if Is_Itype (Typ) and then Scope (Typ) = Current_Scope then |
70482933 RK |
5152 | IR := Make_Itype_Reference (Sloc (N)); |
5153 | Set_Itype (IR, Typ); | |
86cde7b1 | 5154 | Insert_Action (N, IR); |
70482933 RK |
5155 | end if; |
5156 | end Ensure_Defined; | |
5157 | ||
c42e6724 HK |
5158 | -------------------- |
5159 | -- Entry_Names_OK -- | |
5160 | -------------------- | |
5161 | ||
5162 | function Entry_Names_OK return Boolean is | |
5163 | begin | |
5164 | return | |
5165 | not Restricted_Profile | |
5166 | and then not Global_Discard_Names | |
5167 | and then not Restriction_Active (No_Implicit_Heap_Allocations) | |
5168 | and then not Restriction_Active (No_Local_Allocators); | |
5169 | end Entry_Names_OK; | |
5170 | ||
cc570be6 AC |
5171 | ------------------- |
5172 | -- Evaluate_Name -- | |
5173 | ------------------- | |
5174 | ||
5175 | procedure Evaluate_Name (Nam : Node_Id) is | |
cc570be6 | 5176 | begin |
cd5acda5 | 5177 | case Nkind (Nam) is |
1a3680ff PT |
5178 | -- For an aggregate, force its evaluation |
5179 | ||
5180 | when N_Aggregate => | |
5181 | Force_Evaluation (Nam); | |
5182 | ||
5183 | -- For an attribute reference or an indexed component, evaluate the | |
5184 | -- prefix, which is itself a name, recursively, and then force the | |
5185 | -- evaluation of all the subscripts (or attribute expressions). | |
5186 | ||
cd5acda5 YM |
5187 | when N_Attribute_Reference |
5188 | | N_Indexed_Component | |
5189 | => | |
5190 | Evaluate_Name (Prefix (Nam)); | |
cc570be6 | 5191 | |
cd5acda5 YM |
5192 | declare |
5193 | E : Node_Id; | |
cc570be6 | 5194 | |
cd5acda5 YM |
5195 | begin |
5196 | E := First (Expressions (Nam)); | |
5197 | while Present (E) loop | |
5198 | Force_Evaluation (E); | |
cc570be6 | 5199 | |
dc67cfea | 5200 | if Is_Rewrite_Substitution (E) then |
62c7d441 AC |
5201 | Set_Do_Range_Check |
5202 | (E, Do_Range_Check (Original_Node (E))); | |
cd5acda5 | 5203 | end if; |
cc570be6 | 5204 | |
cd5acda5 YM |
5205 | Next (E); |
5206 | end loop; | |
5207 | end; | |
cc570be6 | 5208 | |
cd5acda5 YM |
5209 | -- For an explicit dereference, we simply force the evaluation of |
5210 | -- the name expression. The dereference provides a value that is the | |
5211 | -- address for the renamed object, and it is precisely this value | |
5212 | -- that we want to preserve. | |
cc570be6 | 5213 | |
cd5acda5 YM |
5214 | when N_Explicit_Dereference => |
5215 | Force_Evaluation (Prefix (Nam)); | |
cc570be6 | 5216 | |
df7507a6 | 5217 | -- For a function call, we evaluate the call; same for an operator |
cc570be6 | 5218 | |
df7507a6 PT |
5219 | when N_Function_Call |
5220 | | N_Op | |
5221 | => | |
cd5acda5 | 5222 | Force_Evaluation (Nam); |
cc570be6 | 5223 | |
1a3680ff | 5224 | -- For a qualified expression, we evaluate the expression |
cc570be6 | 5225 | |
cd5acda5 | 5226 | when N_Qualified_Expression => |
1a3680ff | 5227 | Evaluate_Name (Expression (Nam)); |
cc570be6 | 5228 | |
cd5acda5 | 5229 | -- For a selected component, we simply evaluate the prefix |
cc570be6 | 5230 | |
cd5acda5 YM |
5231 | when N_Selected_Component => |
5232 | Evaluate_Name (Prefix (Nam)); | |
cc570be6 | 5233 | |
cd5acda5 YM |
5234 | -- For a slice, we evaluate the prefix, as for the indexed component |
5235 | -- case and then, if there is a range present, either directly or as | |
5236 | -- the constraint of a discrete subtype indication, we evaluate the | |
5237 | -- two bounds of this range. | |
cc570be6 | 5238 | |
cd5acda5 YM |
5239 | when N_Slice => |
5240 | Evaluate_Name (Prefix (Nam)); | |
5241 | Evaluate_Slice_Bounds (Nam); | |
cc570be6 | 5242 | |
cd5acda5 YM |
5243 | -- For a type conversion, the expression of the conversion must be |
5244 | -- the name of an object, and we simply need to evaluate this name. | |
cc570be6 | 5245 | |
cd5acda5 YM |
5246 | when N_Type_Conversion => |
5247 | Evaluate_Name (Expression (Nam)); | |
5248 | ||
df7507a6 PT |
5249 | -- The remaining cases are direct name and character literal. In all |
5250 | -- these cases, we do nothing, since we want to reevaluate each time | |
5251 | -- the renamed object is used. ??? There are more remaining cases, at | |
5252 | -- least in the GNATprove_Mode, where this routine is called in more | |
5253 | -- contexts than in GNAT. | |
cd5acda5 YM |
5254 | |
5255 | when others => | |
5256 | null; | |
5257 | end case; | |
cc570be6 AC |
5258 | end Evaluate_Name; |
5259 | ||
08cd7c2f AC |
5260 | --------------------------- |
5261 | -- Evaluate_Slice_Bounds -- | |
5262 | --------------------------- | |
5263 | ||
5264 | procedure Evaluate_Slice_Bounds (Slice : Node_Id) is | |
5265 | DR : constant Node_Id := Discrete_Range (Slice); | |
5266 | Constr : Node_Id; | |
5267 | Rexpr : Node_Id; | |
5268 | ||
5269 | begin | |
5270 | if Nkind (DR) = N_Range then | |
5271 | Force_Evaluation (Low_Bound (DR)); | |
5272 | Force_Evaluation (High_Bound (DR)); | |
5273 | ||
5274 | elsif Nkind (DR) = N_Subtype_Indication then | |
5275 | Constr := Constraint (DR); | |
5276 | ||
5277 | if Nkind (Constr) = N_Range_Constraint then | |
5278 | Rexpr := Range_Expression (Constr); | |
5279 | ||
5280 | Force_Evaluation (Low_Bound (Rexpr)); | |
5281 | Force_Evaluation (High_Bound (Rexpr)); | |
5282 | end if; | |
5283 | end if; | |
5284 | end Evaluate_Slice_Bounds; | |
5285 | ||
70482933 RK |
5286 | --------------------- |
5287 | -- Evolve_And_Then -- | |
5288 | --------------------- | |
5289 | ||
5290 | procedure Evolve_And_Then (Cond : in out Node_Id; Cond1 : Node_Id) is | |
5291 | begin | |
5292 | if No (Cond) then | |
5293 | Cond := Cond1; | |
5294 | else | |
5295 | Cond := | |
5296 | Make_And_Then (Sloc (Cond1), | |
5297 | Left_Opnd => Cond, | |
5298 | Right_Opnd => Cond1); | |
5299 | end if; | |
5300 | end Evolve_And_Then; | |
5301 | ||
5302 | -------------------- | |
5303 | -- Evolve_Or_Else -- | |
5304 | -------------------- | |
5305 | ||
5306 | procedure Evolve_Or_Else (Cond : in out Node_Id; Cond1 : Node_Id) is | |
5307 | begin | |
5308 | if No (Cond) then | |
5309 | Cond := Cond1; | |
5310 | else | |
5311 | Cond := | |
5312 | Make_Or_Else (Sloc (Cond1), | |
5313 | Left_Opnd => Cond, | |
5314 | Right_Opnd => Cond1); | |
5315 | end if; | |
5316 | end Evolve_Or_Else; | |
5317 | ||
9e92ad49 AC |
5318 | ----------------------------------------- |
5319 | -- Expand_Static_Predicates_In_Choices -- | |
5320 | ----------------------------------------- | |
5321 | ||
5322 | procedure Expand_Static_Predicates_In_Choices (N : Node_Id) is | |
4a08c95c | 5323 | pragma Assert (Nkind (N) in N_Case_Statement_Alternative | N_Variant); |
9e92ad49 AC |
5324 | |
5325 | Choices : constant List_Id := Discrete_Choices (N); | |
5326 | ||
5327 | Choice : Node_Id; | |
5328 | Next_C : Node_Id; | |
5329 | P : Node_Id; | |
5330 | C : Node_Id; | |
5331 | ||
5332 | begin | |
5333 | Choice := First (Choices); | |
5334 | while Present (Choice) loop | |
5335 | Next_C := Next (Choice); | |
5336 | ||
5337 | -- Check for name of subtype with static predicate | |
5338 | ||
5339 | if Is_Entity_Name (Choice) | |
5340 | and then Is_Type (Entity (Choice)) | |
5341 | and then Has_Predicates (Entity (Choice)) | |
5342 | then | |
5343 | -- Loop through entries in predicate list, converting to choices | |
5344 | -- and inserting in the list before the current choice. Note that | |
5345 | -- if the list is empty, corresponding to a False predicate, then | |
5346 | -- no choices are inserted. | |
5347 | ||
60f908dd | 5348 | P := First (Static_Discrete_Predicate (Entity (Choice))); |
9e92ad49 AC |
5349 | while Present (P) loop |
5350 | ||
5351 | -- If low bound and high bounds are equal, copy simple choice | |
5352 | ||
5353 | if Expr_Value (Low_Bound (P)) = Expr_Value (High_Bound (P)) then | |
5354 | C := New_Copy (Low_Bound (P)); | |
5355 | ||
5356 | -- Otherwise copy a range | |
5357 | ||
5358 | else | |
5359 | C := New_Copy (P); | |
5360 | end if; | |
5361 | ||
5362 | -- Change Sloc to referencing choice (rather than the Sloc of | |
15918371 | 5363 | -- the predicate declaration element itself). |
9e92ad49 AC |
5364 | |
5365 | Set_Sloc (C, Sloc (Choice)); | |
5366 | Insert_Before (Choice, C); | |
5367 | Next (P); | |
5368 | end loop; | |
5369 | ||
5370 | -- Delete the predicated entry | |
5371 | ||
5372 | Remove (Choice); | |
5373 | end if; | |
5374 | ||
5375 | -- Move to next choice to check | |
5376 | ||
5377 | Choice := Next_C; | |
5378 | end loop; | |
ebea257e HK |
5379 | |
5380 | Set_Has_SP_Choice (N, False); | |
9e92ad49 AC |
5381 | end Expand_Static_Predicates_In_Choices; |
5382 | ||
70482933 RK |
5383 | ------------------------------ |
5384 | -- Expand_Subtype_From_Expr -- | |
5385 | ------------------------------ | |
5386 | ||
5387 | -- This function is applicable for both static and dynamic allocation of | |
5388 | -- objects which are constrained by an initial expression. Basically it | |
5389 | -- transforms an unconstrained subtype indication into a constrained one. | |
273adcdf | 5390 | |
70482933 | 5391 | -- The expression may also be transformed in certain cases in order to |
05350ac6 BD |
5392 | -- avoid multiple evaluation. In the static allocation case, the general |
5393 | -- scheme is: | |
70482933 RK |
5394 | |
5395 | -- Val : T := Expr; | |
5396 | ||
5397 | -- is transformed into | |
5398 | ||
65e5747e | 5399 | -- Val : Constrained_Subtype_Of_T := Maybe_Modified_Expr; |
70482933 RK |
5400 | -- |
5401 | -- Here are the main cases : | |
5402 | -- | |
5403 | -- <if Expr is a Slice> | |
5404 | -- Val : T ([Index_Subtype (Expr)]) := Expr; | |
5405 | -- | |
5406 | -- <elsif Expr is a String Literal> | |
5407 | -- Val : T (T'First .. T'First + Length (string literal) - 1) := Expr; | |
5408 | -- | |
5409 | -- <elsif Expr is Constrained> | |
5410 | -- subtype T is Type_Of_Expr | |
5411 | -- Val : T := Expr; | |
5412 | -- | |
5413 | -- <elsif Expr is an entity_name> | |
638e383e | 5414 | -- Val : T (constraints taken from Expr) := Expr; |
70482933 RK |
5415 | -- |
5416 | -- <else> | |
5417 | -- type Axxx is access all T; | |
5418 | -- Rval : Axxx := Expr'ref; | |
638e383e | 5419 | -- Val : T (constraints taken from Rval) := Rval.all; |
70482933 RK |
5420 | |
5421 | -- ??? note: when the Expression is allocated in the secondary stack | |
5422 | -- we could use it directly instead of copying it by declaring | |
5423 | -- Val : T (...) renames Rval.all | |
5424 | ||
5425 | procedure Expand_Subtype_From_Expr | |
5426 | (N : Node_Id; | |
5427 | Unc_Type : Entity_Id; | |
5428 | Subtype_Indic : Node_Id; | |
d9307840 HK |
5429 | Exp : Node_Id; |
5430 | Related_Id : Entity_Id := Empty) | |
70482933 RK |
5431 | is |
5432 | Loc : constant Source_Ptr := Sloc (N); | |
5433 | Exp_Typ : constant Entity_Id := Etype (Exp); | |
5434 | T : Entity_Id; | |
5435 | ||
5436 | begin | |
5437 | -- In general we cannot build the subtype if expansion is disabled, | |
5438 | -- because internal entities may not have been defined. However, to | |
f2e7ec10 AC |
5439 | -- avoid some cascaded errors, we try to continue when the expression is |
5440 | -- an array (or string), because it is safe to compute the bounds. It is | |
5441 | -- in fact required to do so even in a generic context, because there | |
5442 | -- may be constants that depend on the bounds of a string literal, both | |
5443 | -- standard string types and more generally arrays of characters. | |
70482933 | 5444 | |
5dd63272 YM |
5445 | -- In GNATprove mode, these extra subtypes are not needed, unless Exp is |
5446 | -- a static expression. In that case, the subtype will be constrained | |
5447 | -- while the original type might be unconstrained, so expanding the type | |
5448 | -- is necessary both for passing legality checks in GNAT and for precise | |
5449 | -- analysis in GNATprove. | |
5450 | ||
134f52b9 | 5451 | if GNATprove_Mode and then not Is_Static_Expression (Exp) then |
70482933 RK |
5452 | return; |
5453 | end if; | |
5454 | ||
ebb6b0bd AC |
5455 | if not Expander_Active |
5456 | and then (No (Etype (Exp)) or else not Is_String_Type (Etype (Exp))) | |
5457 | then | |
f5da7a97 YM |
5458 | return; |
5459 | end if; | |
5460 | ||
70482933 RK |
5461 | if Nkind (Exp) = N_Slice then |
5462 | declare | |
5463 | Slice_Type : constant Entity_Id := Etype (First_Index (Exp_Typ)); | |
5464 | ||
5465 | begin | |
5466 | Rewrite (Subtype_Indic, | |
5467 | Make_Subtype_Indication (Loc, | |
e4494292 | 5468 | Subtype_Mark => New_Occurrence_Of (Unc_Type, Loc), |
70482933 RK |
5469 | Constraint => |
5470 | Make_Index_Or_Discriminant_Constraint (Loc, | |
5471 | Constraints => New_List | |
e4494292 | 5472 | (New_Occurrence_Of (Slice_Type, Loc))))); |
70482933 | 5473 | |
e14c931f | 5474 | -- This subtype indication may be used later for constraint checks |
70482933 | 5475 | -- we better make sure that if a variable was used as a bound of |
134f52b9 | 5476 | -- the original slice, its value is frozen. |
70482933 | 5477 | |
08cd7c2f | 5478 | Evaluate_Slice_Bounds (Exp); |
70482933 RK |
5479 | end; |
5480 | ||
5481 | elsif Ekind (Exp_Typ) = E_String_Literal_Subtype then | |
5482 | Rewrite (Subtype_Indic, | |
5483 | Make_Subtype_Indication (Loc, | |
e4494292 | 5484 | Subtype_Mark => New_Occurrence_Of (Unc_Type, Loc), |
70482933 RK |
5485 | Constraint => |
5486 | Make_Index_Or_Discriminant_Constraint (Loc, | |
5487 | Constraints => New_List ( | |
5488 | Make_Literal_Range (Loc, | |
f91b40db | 5489 | Literal_Typ => Exp_Typ))))); |
70482933 | 5490 | |
9a7049fd | 5491 | -- If the type of the expression is an internally generated type it |
872c2f37 RD |
5492 | -- may not be necessary to create a new subtype. However there are two |
5493 | -- exceptions: references to the current instances, and aliased array | |
bb072d1c | 5494 | -- object declarations for which the back end has to create a template. |
9a7049fd | 5495 | |
70482933 RK |
5496 | elsif Is_Constrained (Exp_Typ) |
5497 | and then not Is_Class_Wide_Type (Unc_Type) | |
9a7049fd AC |
5498 | and then |
5499 | (Nkind (N) /= N_Object_Declaration | |
872c2f37 RD |
5500 | or else not Is_Entity_Name (Expression (N)) |
5501 | or else not Comes_From_Source (Entity (Expression (N))) | |
5502 | or else not Is_Array_Type (Exp_Typ) | |
5503 | or else not Aliased_Present (N)) | |
70482933 RK |
5504 | then |
5505 | if Is_Itype (Exp_Typ) then | |
5506 | ||
758c442c | 5507 | -- Within an initialization procedure, a selected component |
273adcdf AC |
5508 | -- denotes a component of the enclosing record, and it appears as |
5509 | -- an actual in a call to its own initialization procedure. If | |
5510 | -- this component depends on the outer discriminant, we must | |
758c442c | 5511 | -- generate the proper actual subtype for it. |
70482933 | 5512 | |
758c442c GD |
5513 | if Nkind (Exp) = N_Selected_Component |
5514 | and then Within_Init_Proc | |
5515 | then | |
5516 | declare | |
5517 | Decl : constant Node_Id := | |
5518 | Build_Actual_Subtype_Of_Component (Exp_Typ, Exp); | |
5519 | begin | |
5520 | if Present (Decl) then | |
5521 | Insert_Action (N, Decl); | |
5522 | T := Defining_Identifier (Decl); | |
5523 | else | |
5524 | T := Exp_Typ; | |
5525 | end if; | |
5526 | end; | |
5527 | ||
9a7049fd | 5528 | -- No need to generate a new subtype |
758c442c GD |
5529 | |
5530 | else | |
5531 | T := Exp_Typ; | |
5532 | end if; | |
70482933 RK |
5533 | |
5534 | else | |
092ef350 | 5535 | T := Make_Temporary (Loc, 'T'); |
70482933 RK |
5536 | |
5537 | Insert_Action (N, | |
5538 | Make_Subtype_Declaration (Loc, | |
5539 | Defining_Identifier => T, | |
e4494292 | 5540 | Subtype_Indication => New_Occurrence_Of (Exp_Typ, Loc))); |
70482933 | 5541 | |
273adcdf AC |
5542 | -- This type is marked as an itype even though it has an explicit |
5543 | -- declaration since otherwise Is_Generic_Actual_Type can get | |
5544 | -- set, resulting in the generation of spurious errors. (See | |
5545 | -- sem_ch8.Analyze_Package_Renaming and sem_type.covers) | |
70482933 RK |
5546 | |
5547 | Set_Is_Itype (T); | |
5548 | Set_Associated_Node_For_Itype (T, Exp); | |
5549 | end if; | |
5550 | ||
e4494292 | 5551 | Rewrite (Subtype_Indic, New_Occurrence_Of (T, Loc)); |
70482933 | 5552 | |
0a69df7c | 5553 | -- Nothing needs to be done for private types with unknown discriminants |
3f5bb1b8 AC |
5554 | -- if the underlying type is not an unconstrained composite type or it |
5555 | -- is an unchecked union. | |
70482933 RK |
5556 | |
5557 | elsif Is_Private_Type (Unc_Type) | |
5558 | and then Has_Unknown_Discriminants (Unc_Type) | |
5559 | and then (not Is_Composite_Type (Underlying_Type (Unc_Type)) | |
0a69df7c AC |
5560 | or else Is_Constrained (Underlying_Type (Unc_Type)) |
5561 | or else Is_Unchecked_Union (Underlying_Type (Unc_Type))) | |
70482933 RK |
5562 | then |
5563 | null; | |
5564 | ||
58a9d876 AC |
5565 | -- Case of derived type with unknown discriminants where the parent type |
5566 | -- also has unknown discriminants. | |
f4d379b8 HK |
5567 | |
5568 | elsif Is_Record_Type (Unc_Type) | |
5569 | and then not Is_Class_Wide_Type (Unc_Type) | |
5570 | and then Has_Unknown_Discriminants (Unc_Type) | |
5571 | and then Has_Unknown_Discriminants (Underlying_Type (Unc_Type)) | |
5572 | then | |
58a9d876 AC |
5573 | -- Nothing to be done if no underlying record view available |
5574 | ||
913e4b36 | 5575 | -- If this is a limited type derived from a type with unknown |
9313a26a AC |
5576 | -- discriminants, do not expand either, so that subsequent expansion |
5577 | -- of the call can add build-in-place parameters to call. | |
913e4b36 ES |
5578 | |
5579 | if No (Underlying_Record_View (Unc_Type)) | |
5580 | or else Is_Limited_Type (Unc_Type) | |
5581 | then | |
58a9d876 AC |
5582 | null; |
5583 | ||
5584 | -- Otherwise use the Underlying_Record_View to create the proper | |
5585 | -- constrained subtype for an object of a derived type with unknown | |
5586 | -- discriminants. | |
5587 | ||
5588 | else | |
5589 | Remove_Side_Effects (Exp); | |
5590 | Rewrite (Subtype_Indic, | |
5591 | Make_Subtype_From_Expr (Exp, Underlying_Record_View (Unc_Type))); | |
5592 | end if; | |
f4d379b8 | 5593 | |
0e41a941 AC |
5594 | -- Renamings of class-wide interface types require no equivalent |
5595 | -- constrained type declarations because we only need to reference | |
df3e68b1 HK |
5596 | -- the tag component associated with the interface. The same is |
5597 | -- presumably true for class-wide types in general, so this test | |
5598 | -- is broadened to include all class-wide renamings, which also | |
5599 | -- avoids cases of unbounded recursion in Remove_Side_Effects. | |
5600 | -- (Is this really correct, or are there some cases of class-wide | |
5601 | -- renamings that require action in this procedure???) | |
0e41a941 AC |
5602 | |
5603 | elsif Present (N) | |
5604 | and then Nkind (N) = N_Object_Renaming_Declaration | |
df3e68b1 | 5605 | and then Is_Class_Wide_Type (Unc_Type) |
0e41a941 | 5606 | then |
0e41a941 AC |
5607 | null; |
5608 | ||
885c4871 | 5609 | -- In Ada 95 nothing to be done if the type of the expression is limited |
aa9a7dd7 AC |
5610 | -- because in this case the expression cannot be copied, and its use can |
5611 | -- only be by reference. | |
10b93b2e | 5612 | |
885c4871 | 5613 | -- In Ada 2005 the context can be an object declaration whose expression |
0712790c ES |
5614 | -- is a function that returns in place. If the nominal subtype has |
5615 | -- unknown discriminants, the call still provides constraints on the | |
5616 | -- object, and we have to create an actual subtype from it. | |
5617 | ||
5618 | -- If the type is class-wide, the expression is dynamically tagged and | |
5619 | -- we do not create an actual subtype either. Ditto for an interface. | |
0187b60e AC |
5620 | -- For now this applies only if the type is immutably limited, and the |
5621 | -- function being called is build-in-place. This will have to be revised | |
5622 | -- when build-in-place functions are generalized to other types. | |
0712790c | 5623 | |
51245e2d | 5624 | elsif Is_Limited_View (Exp_Typ) |
0712790c ES |
5625 | and then |
5626 | (Is_Class_Wide_Type (Exp_Typ) | |
5627 | or else Is_Interface (Exp_Typ) | |
5628 | or else not Has_Unknown_Discriminants (Exp_Typ) | |
5629 | or else not Is_Composite_Type (Unc_Type)) | |
5630 | then | |
5631 | null; | |
5632 | ||
e3946607 | 5633 | -- For limited objects initialized with build-in-place function calls, |
86cde7b1 RD |
5634 | -- nothing to be done; otherwise we prematurely introduce an N_Reference |
5635 | -- node in the expression initializing the object, which breaks the | |
5636 | -- circuitry that detects and adds the additional arguments to the | |
5637 | -- called function. | |
5638 | ||
5639 | elsif Is_Build_In_Place_Function_Call (Exp) then | |
5640 | null; | |
5641 | ||
e3946607 GD |
5642 | -- If the expression is an uninitialized aggregate, no need to build |
5643 | -- a subtype from the expression, because this may require the use of | |
5644 | -- dynamic memory to create the object. | |
a46fa651 ES |
5645 | |
5646 | elsif Is_Uninitialized_Aggregate (Exp, Exp_Typ) then | |
5647 | Rewrite (Subtype_Indic, New_Occurrence_Of (Etype (Exp), Sloc (N))); | |
5648 | if Nkind (N) = N_Object_Declaration then | |
5649 | Set_Expression (N, Empty); | |
5650 | Set_No_Initialization (N); | |
5651 | end if; | |
5652 | ||
70482933 RK |
5653 | else |
5654 | Remove_Side_Effects (Exp); | |
5655 | Rewrite (Subtype_Indic, | |
d9307840 | 5656 | Make_Subtype_From_Expr (Exp, Unc_Type, Related_Id)); |
70482933 RK |
5657 | end if; |
5658 | end Expand_Subtype_From_Expr; | |
5659 | ||
28ccbd3f AC |
5660 | --------------------------------------------- |
5661 | -- Expression_Contains_Primitives_Calls_Of -- | |
5662 | --------------------------------------------- | |
5663 | ||
5664 | function Expression_Contains_Primitives_Calls_Of | |
5665 | (Expr : Node_Id; | |
5666 | Typ : Entity_Id) return Boolean | |
5667 | is | |
5668 | U_Typ : constant Entity_Id := Unique_Entity (Typ); | |
5669 | ||
bf604a5e | 5670 | Calls_OK : Boolean := False; |
eb2d5ccc | 5671 | -- This flag is set to True when expression Expr contains at least one |
e0666fc6 | 5672 | -- call to a nondispatching primitive function of Typ. |
bf604a5e | 5673 | |
28ccbd3f | 5674 | function Search_Primitive_Calls (N : Node_Id) return Traverse_Result; |
178c3cba | 5675 | -- Search for nondispatching calls to primitive functions of type Typ |
28ccbd3f AC |
5676 | |
5677 | ---------------------------- | |
5678 | -- Search_Primitive_Calls -- | |
5679 | ---------------------------- | |
5680 | ||
eb2d5ccc | 5681 | function Search_Primitive_Calls (N : Node_Id) return Traverse_Result is |
bf604a5e AC |
5682 | Disp_Typ : Entity_Id; |
5683 | Subp : Entity_Id; | |
5684 | ||
28ccbd3f | 5685 | begin |
e0666fc6 | 5686 | -- Detect a function call that could denote a nondispatching |
bf604a5e AC |
5687 | -- primitive of the input type. |
5688 | ||
5689 | if Nkind (N) = N_Function_Call | |
5690 | and then Is_Entity_Name (Name (N)) | |
28ccbd3f | 5691 | then |
bf604a5e | 5692 | Subp := Entity (Name (N)); |
28ccbd3f | 5693 | |
e0666fc6 | 5694 | -- Do not consider function calls with a controlling argument, as |
eb2d5ccc | 5695 | -- those are always dispatching calls. |
bf604a5e AC |
5696 | |
5697 | if Is_Dispatching_Operation (Subp) | |
5698 | and then No (Controlling_Argument (N)) | |
28ccbd3f | 5699 | then |
bf604a5e | 5700 | Disp_Typ := Find_Dispatching_Type (Subp); |
28ccbd3f | 5701 | |
eb2d5ccc AC |
5702 | -- To qualify as a suitable primitive, the dispatching type of |
5703 | -- the function must be the input type. | |
28ccbd3f | 5704 | |
bf604a5e AC |
5705 | if Present (Disp_Typ) |
5706 | and then Unique_Entity (Disp_Typ) = U_Typ | |
5707 | then | |
5708 | Calls_OK := True; | |
5709 | ||
e0666fc6 | 5710 | -- There is no need to continue the traversal, as one such |
eb2d5ccc | 5711 | -- call suffices. |
bf604a5e AC |
5712 | |
5713 | return Abandon; | |
5714 | end if; | |
28ccbd3f AC |
5715 | end if; |
5716 | end if; | |
5717 | ||
5718 | return OK; | |
5719 | end Search_Primitive_Calls; | |
5720 | ||
eb2d5ccc | 5721 | procedure Search_Calls is new Traverse_Proc (Search_Primitive_Calls); |
28ccbd3f AC |
5722 | |
5723 | -- Start of processing for Expression_Contains_Primitives_Calls_Of_Type | |
5724 | ||
5725 | begin | |
bf604a5e AC |
5726 | Search_Calls (Expr); |
5727 | return Calls_OK; | |
28ccbd3f AC |
5728 | end Expression_Contains_Primitives_Calls_Of; |
5729 | ||
760804f3 AC |
5730 | ---------------------- |
5731 | -- Finalize_Address -- | |
5732 | ---------------------- | |
5733 | ||
5734 | function Finalize_Address (Typ : Entity_Id) return Entity_Id is | |
78170c8e | 5735 | Btyp : constant Entity_Id := Base_Type (Typ); |
760804f3 AC |
5736 | Utyp : Entity_Id := Typ; |
5737 | ||
5738 | begin | |
5739 | -- Handle protected class-wide or task class-wide types | |
5740 | ||
5741 | if Is_Class_Wide_Type (Utyp) then | |
5742 | if Is_Concurrent_Type (Root_Type (Utyp)) then | |
5743 | Utyp := Root_Type (Utyp); | |
5744 | ||
5745 | elsif Is_Private_Type (Root_Type (Utyp)) | |
5746 | and then Present (Full_View (Root_Type (Utyp))) | |
5747 | and then Is_Concurrent_Type (Full_View (Root_Type (Utyp))) | |
5748 | then | |
5749 | Utyp := Full_View (Root_Type (Utyp)); | |
5750 | end if; | |
5751 | end if; | |
5752 | ||
5753 | -- Handle private types | |
5754 | ||
5755 | if Is_Private_Type (Utyp) and then Present (Full_View (Utyp)) then | |
5756 | Utyp := Full_View (Utyp); | |
5757 | end if; | |
5758 | ||
5759 | -- Handle protected and task types | |
5760 | ||
5761 | if Is_Concurrent_Type (Utyp) | |
5762 | and then Present (Corresponding_Record_Type (Utyp)) | |
5763 | then | |
5764 | Utyp := Corresponding_Record_Type (Utyp); | |
5765 | end if; | |
5766 | ||
5767 | Utyp := Underlying_Type (Base_Type (Utyp)); | |
5768 | ||
5769 | -- Deal with untagged derivation of private views. If the parent is | |
5770 | -- now known to be protected, the finalization routine is the one | |
5771 | -- defined on the corresponding record of the ancestor (corresponding | |
5772 | -- records do not automatically inherit operations, but maybe they | |
5773 | -- should???) | |
5774 | ||
78170c8e EB |
5775 | if Is_Untagged_Derivation (Btyp) then |
5776 | if Is_Protected_Type (Btyp) then | |
5777 | Utyp := Corresponding_Record_Type (Root_Type (Btyp)); | |
46413d9e | 5778 | |
760804f3 | 5779 | else |
78170c8e | 5780 | Utyp := Underlying_Type (Root_Type (Btyp)); |
760804f3 AC |
5781 | |
5782 | if Is_Protected_Type (Utyp) then | |
5783 | Utyp := Corresponding_Record_Type (Utyp); | |
5784 | end if; | |
5785 | end if; | |
5786 | end if; | |
5787 | ||
5788 | -- If the underlying_type is a subtype, we are dealing with the | |
5789 | -- completion of a private type. We need to access the base type and | |
5790 | -- generate a conversion to it. | |
5791 | ||
5792 | if Utyp /= Base_Type (Utyp) then | |
5793 | pragma Assert (Is_Private_Type (Typ)); | |
5794 | ||
5795 | Utyp := Base_Type (Utyp); | |
5796 | end if; | |
5797 | ||
5798 | -- When dealing with an internally built full view for a type with | |
5799 | -- unknown discriminants, use the original record type. | |
5800 | ||
5801 | if Is_Underlying_Record_View (Utyp) then | |
5802 | Utyp := Etype (Utyp); | |
5803 | end if; | |
5804 | ||
5805 | return TSS (Utyp, TSS_Finalize_Address); | |
5806 | end Finalize_Address; | |
5807 | ||
758c442c | 5808 | ------------------------ |
f4d379b8 | 5809 | -- Find_Interface_ADT -- |
758c442c GD |
5810 | ------------------------ |
5811 | ||
3ca505dc JM |
5812 | function Find_Interface_ADT |
5813 | (T : Entity_Id; | |
ac4d6407 | 5814 | Iface : Entity_Id) return Elmt_Id |
3ca505dc | 5815 | is |
ce2b6ba5 JM |
5816 | ADT : Elmt_Id; |
5817 | Typ : Entity_Id := T; | |
3ca505dc JM |
5818 | |
5819 | begin | |
dee4682a JM |
5820 | pragma Assert (Is_Interface (Iface)); |
5821 | ||
3ca505dc JM |
5822 | -- Handle private types |
5823 | ||
0e564ab4 | 5824 | if Has_Private_Declaration (Typ) and then Present (Full_View (Typ)) then |
3ca505dc JM |
5825 | Typ := Full_View (Typ); |
5826 | end if; | |
5827 | ||
5828 | -- Handle access types | |
5829 | ||
5830 | if Is_Access_Type (Typ) then | |
841dd0f5 | 5831 | Typ := Designated_Type (Typ); |
3ca505dc JM |
5832 | end if; |
5833 | ||
5834 | -- Handle task and protected types implementing interfaces | |
5835 | ||
dee4682a | 5836 | if Is_Concurrent_Type (Typ) then |
3ca505dc JM |
5837 | Typ := Corresponding_Record_Type (Typ); |
5838 | end if; | |
5839 | ||
dee4682a JM |
5840 | pragma Assert |
5841 | (not Is_Class_Wide_Type (Typ) | |
5842 | and then Ekind (Typ) /= E_Incomplete_Type); | |
5843 | ||
4ac2477e | 5844 | if Is_Ancestor (Iface, Typ, Use_Full_View => True) then |
ce2b6ba5 JM |
5845 | return First_Elmt (Access_Disp_Table (Typ)); |
5846 | ||
5847 | else | |
872c2f37 | 5848 | ADT := Next_Elmt (Next_Elmt (First_Elmt (Access_Disp_Table (Typ)))); |
ce2b6ba5 JM |
5849 | while Present (ADT) |
5850 | and then Present (Related_Type (Node (ADT))) | |
5851 | and then Related_Type (Node (ADT)) /= Iface | |
4ac2477e JM |
5852 | and then not Is_Ancestor (Iface, Related_Type (Node (ADT)), |
5853 | Use_Full_View => True) | |
ce2b6ba5 JM |
5854 | loop |
5855 | Next_Elmt (ADT); | |
5856 | end loop; | |
5857 | ||
5858 | pragma Assert (Present (Related_Type (Node (ADT)))); | |
5859 | return ADT; | |
5860 | end if; | |
3ca505dc JM |
5861 | end Find_Interface_ADT; |
5862 | ||
5863 | ------------------------ | |
5864 | -- Find_Interface_Tag -- | |
5865 | ------------------------ | |
5866 | ||
5867 | function Find_Interface_Tag | |
dee4682a JM |
5868 | (T : Entity_Id; |
5869 | Iface : Entity_Id) return Entity_Id | |
758c442c | 5870 | is |
dcd5fd67 | 5871 | AI_Tag : Entity_Id := Empty; |
dee4682a | 5872 | Found : Boolean := False; |
3ca505dc | 5873 | Typ : Entity_Id := T; |
758c442c | 5874 | |
59e54267 | 5875 | procedure Find_Tag (Typ : Entity_Id); |
3ca505dc | 5876 | -- Internal subprogram used to recursively climb to the ancestors |
758c442c | 5877 | |
ea985d95 RD |
5878 | -------------- |
5879 | -- Find_Tag -- | |
5880 | -------------- | |
758c442c | 5881 | |
59e54267 | 5882 | procedure Find_Tag (Typ : Entity_Id) is |
758c442c GD |
5883 | AI_Elmt : Elmt_Id; |
5884 | AI : Node_Id; | |
5885 | ||
5886 | begin | |
0e41a941 AC |
5887 | -- This routine does not handle the case in which the interface is an |
5888 | -- ancestor of Typ. That case is handled by the enclosing subprogram. | |
758c442c | 5889 | |
0e41a941 | 5890 | pragma Assert (Typ /= Iface); |
758c442c | 5891 | |
f4d379b8 HK |
5892 | -- Climb to the root type handling private types |
5893 | ||
ce2b6ba5 | 5894 | if Present (Full_View (Etype (Typ))) then |
f4d379b8 HK |
5895 | if Full_View (Etype (Typ)) /= Typ then |
5896 | Find_Tag (Full_View (Etype (Typ))); | |
5897 | end if; | |
758c442c | 5898 | |
f4d379b8 | 5899 | elsif Etype (Typ) /= Typ then |
3ca505dc | 5900 | Find_Tag (Etype (Typ)); |
758c442c GD |
5901 | end if; |
5902 | ||
5903 | -- Traverse the list of interfaces implemented by the type | |
5904 | ||
5905 | if not Found | |
ce2b6ba5 JM |
5906 | and then Present (Interfaces (Typ)) |
5907 | and then not (Is_Empty_Elmt_List (Interfaces (Typ))) | |
758c442c | 5908 | then |
10b93b2e | 5909 | -- Skip the tag associated with the primary table |
758c442c | 5910 | |
ce2b6ba5 JM |
5911 | AI_Tag := Next_Tag_Component (First_Tag_Component (Typ)); |
5912 | pragma Assert (Present (AI_Tag)); | |
758c442c | 5913 | |
ce2b6ba5 | 5914 | AI_Elmt := First_Elmt (Interfaces (Typ)); |
758c442c GD |
5915 | while Present (AI_Elmt) loop |
5916 | AI := Node (AI_Elmt); | |
5917 | ||
4ac2477e JM |
5918 | if AI = Iface |
5919 | or else Is_Ancestor (Iface, AI, Use_Full_View => True) | |
5920 | then | |
758c442c GD |
5921 | Found := True; |
5922 | return; | |
5923 | end if; | |
5924 | ||
5925 | AI_Tag := Next_Tag_Component (AI_Tag); | |
5926 | Next_Elmt (AI_Elmt); | |
758c442c GD |
5927 | end loop; |
5928 | end if; | |
3ca505dc JM |
5929 | end Find_Tag; |
5930 | ||
5931 | -- Start of processing for Find_Interface_Tag | |
758c442c GD |
5932 | |
5933 | begin | |
f4d379b8 HK |
5934 | pragma Assert (Is_Interface (Iface)); |
5935 | ||
3ca505dc | 5936 | -- Handle access types |
758c442c | 5937 | |
3ca505dc | 5938 | if Is_Access_Type (Typ) then |
841dd0f5 | 5939 | Typ := Designated_Type (Typ); |
3ca505dc | 5940 | end if; |
758c442c | 5941 | |
c6ad817f | 5942 | -- Handle class-wide types |
758c442c | 5943 | |
c6ad817f JM |
5944 | if Is_Class_Wide_Type (Typ) then |
5945 | Typ := Root_Type (Typ); | |
3ca505dc JM |
5946 | end if; |
5947 | ||
c6ad817f JM |
5948 | -- Handle private types |
5949 | ||
0e564ab4 | 5950 | if Has_Private_Declaration (Typ) and then Present (Full_View (Typ)) then |
c6ad817f | 5951 | Typ := Full_View (Typ); |
10b93b2e HK |
5952 | end if; |
5953 | ||
5954 | -- Handle entities from the limited view | |
5955 | ||
5956 | if Ekind (Typ) = E_Incomplete_Type then | |
5957 | pragma Assert (Present (Non_Limited_View (Typ))); | |
5958 | Typ := Non_Limited_View (Typ); | |
5959 | end if; | |
5960 | ||
c6ad817f JM |
5961 | -- Handle task and protected types implementing interfaces |
5962 | ||
5963 | if Is_Concurrent_Type (Typ) then | |
5964 | Typ := Corresponding_Record_Type (Typ); | |
5965 | end if; | |
5966 | ||
0e41a941 AC |
5967 | -- If the interface is an ancestor of the type, then it shared the |
5968 | -- primary dispatch table. | |
5969 | ||
4ac2477e | 5970 | if Is_Ancestor (Iface, Typ, Use_Full_View => True) then |
0e41a941 AC |
5971 | return First_Tag_Component (Typ); |
5972 | ||
5973 | -- Otherwise we need to search for its associated tag component | |
5974 | ||
5975 | else | |
5976 | Find_Tag (Typ); | |
0e41a941 AC |
5977 | return AI_Tag; |
5978 | end if; | |
ce2b6ba5 | 5979 | end Find_Interface_Tag; |
ea985d95 | 5980 | |
ca811241 BD |
5981 | --------------------------- |
5982 | -- Find_Optional_Prim_Op -- | |
5983 | --------------------------- | |
70482933 | 5984 | |
ca811241 BD |
5985 | function Find_Optional_Prim_Op |
5986 | (T : Entity_Id; Name : Name_Id) return Entity_Id | |
5987 | is | |
70482933 RK |
5988 | Prim : Elmt_Id; |
5989 | Typ : Entity_Id := T; | |
59e54267 | 5990 | Op : Entity_Id; |
70482933 RK |
5991 | |
5992 | begin | |
5993 | if Is_Class_Wide_Type (Typ) then | |
5994 | Typ := Root_Type (Typ); | |
5995 | end if; | |
5996 | ||
5997 | Typ := Underlying_Type (Typ); | |
5998 | ||
59e54267 ES |
5999 | -- Loop through primitive operations |
6000 | ||
70482933 | 6001 | Prim := First_Elmt (Primitive_Operations (Typ)); |
59e54267 ES |
6002 | while Present (Prim) loop |
6003 | Op := Node (Prim); | |
6004 | ||
6005 | -- We can retrieve primitive operations by name if it is an internal | |
6006 | -- name. For equality we must check that both of its operands have | |
6007 | -- the same type, to avoid confusion with user-defined equalities | |
3f833dc2 | 6008 | -- than may have a asymmetric signature. |
59e54267 ES |
6009 | |
6010 | exit when Chars (Op) = Name | |
6011 | and then | |
6012 | (Name /= Name_Op_Eq | |
0e564ab4 | 6013 | or else Etype (First_Formal (Op)) = Etype (Last_Formal (Op))); |
59e54267 | 6014 | |
70482933 | 6015 | Next_Elmt (Prim); |
70482933 RK |
6016 | end loop; |
6017 | ||
ca811241 BD |
6018 | return Node (Prim); -- Empty if not found |
6019 | end Find_Optional_Prim_Op; | |
70482933 | 6020 | |
ca811241 BD |
6021 | --------------------------- |
6022 | -- Find_Optional_Prim_Op -- | |
6023 | --------------------------- | |
dee4682a | 6024 | |
ca811241 | 6025 | function Find_Optional_Prim_Op |
fbf5a39b AC |
6026 | (T : Entity_Id; |
6027 | Name : TSS_Name_Type) return Entity_Id | |
6028 | is | |
df3e68b1 HK |
6029 | Inher_Op : Entity_Id := Empty; |
6030 | Own_Op : Entity_Id := Empty; | |
6031 | Prim_Elmt : Elmt_Id; | |
6032 | Prim_Id : Entity_Id; | |
6033 | Typ : Entity_Id := T; | |
fbf5a39b AC |
6034 | |
6035 | begin | |
6036 | if Is_Class_Wide_Type (Typ) then | |
6037 | Typ := Root_Type (Typ); | |
6038 | end if; | |
6039 | ||
6040 | Typ := Underlying_Type (Typ); | |
6041 | ||
df3e68b1 HK |
6042 | -- This search is based on the assertion that the dispatching version |
6043 | -- of the TSS routine always precedes the real primitive. | |
6a4d72a6 | 6044 | |
df3e68b1 HK |
6045 | Prim_Elmt := First_Elmt (Primitive_Operations (Typ)); |
6046 | while Present (Prim_Elmt) loop | |
6047 | Prim_Id := Node (Prim_Elmt); | |
7813a510 | 6048 | |
df3e68b1 HK |
6049 | if Is_TSS (Prim_Id, Name) then |
6050 | if Present (Alias (Prim_Id)) then | |
6051 | Inher_Op := Prim_Id; | |
6052 | else | |
6053 | Own_Op := Prim_Id; | |
6054 | end if; | |
6a4d72a6 | 6055 | end if; |
df3e68b1 HK |
6056 | |
6057 | Next_Elmt (Prim_Elmt); | |
fbf5a39b AC |
6058 | end loop; |
6059 | ||
df3e68b1 HK |
6060 | if Present (Own_Op) then |
6061 | return Own_Op; | |
6062 | elsif Present (Inher_Op) then | |
6063 | return Inher_Op; | |
6064 | else | |
ca811241 BD |
6065 | return Empty; |
6066 | end if; | |
6067 | end Find_Optional_Prim_Op; | |
6068 | ||
6069 | ------------------ | |
6070 | -- Find_Prim_Op -- | |
6071 | ------------------ | |
6072 | ||
6073 | function Find_Prim_Op | |
6074 | (T : Entity_Id; Name : Name_Id) return Entity_Id | |
6075 | is | |
6076 | Result : constant Entity_Id := Find_Optional_Prim_Op (T, Name); | |
6077 | begin | |
6078 | if No (Result) then | |
6079 | raise Program_Error; | |
6080 | end if; | |
6081 | ||
6082 | return Result; | |
6083 | end Find_Prim_Op; | |
6084 | ||
6085 | ------------------ | |
6086 | -- Find_Prim_Op -- | |
6087 | ------------------ | |
6088 | ||
6089 | function Find_Prim_Op | |
6090 | (T : Entity_Id; | |
6091 | Name : TSS_Name_Type) return Entity_Id | |
6092 | is | |
6093 | Result : constant Entity_Id := Find_Optional_Prim_Op (T, Name); | |
6094 | begin | |
6095 | if No (Result) then | |
df3e68b1 HK |
6096 | raise Program_Error; |
6097 | end if; | |
ca811241 BD |
6098 | |
6099 | return Result; | |
fbf5a39b AC |
6100 | end Find_Prim_Op; |
6101 | ||
65df5b71 HK |
6102 | ---------------------------- |
6103 | -- Find_Protection_Object -- | |
6104 | ---------------------------- | |
6105 | ||
6106 | function Find_Protection_Object (Scop : Entity_Id) return Entity_Id is | |
6107 | S : Entity_Id; | |
6108 | ||
6109 | begin | |
6110 | S := Scop; | |
6111 | while Present (S) loop | |
4a08c95c | 6112 | if Ekind (S) in E_Entry | E_Entry_Family | E_Function | E_Procedure |
65df5b71 HK |
6113 | and then Present (Protection_Object (S)) |
6114 | then | |
6115 | return Protection_Object (S); | |
6116 | end if; | |
6117 | ||
6118 | S := Scope (S); | |
6119 | end loop; | |
6120 | ||
6121 | -- If we do not find a Protection object in the scope chain, then | |
6122 | -- something has gone wrong, most likely the object was never created. | |
6123 | ||
6124 | raise Program_Error; | |
6125 | end Find_Protection_Object; | |
6126 | ||
df3e68b1 HK |
6127 | -------------------------- |
6128 | -- Find_Protection_Type -- | |
6129 | -------------------------- | |
6130 | ||
6131 | function Find_Protection_Type (Conc_Typ : Entity_Id) return Entity_Id is | |
6132 | Comp : Entity_Id; | |
6133 | Typ : Entity_Id := Conc_Typ; | |
6134 | ||
6135 | begin | |
6136 | if Is_Concurrent_Type (Typ) then | |
6137 | Typ := Corresponding_Record_Type (Typ); | |
6138 | end if; | |
6139 | ||
e0c32166 AC |
6140 | -- Since restriction violations are not considered serious errors, the |
6141 | -- expander remains active, but may leave the corresponding record type | |
6142 | -- malformed. In such cases, component _object is not available so do | |
6143 | -- not look for it. | |
6144 | ||
6145 | if not Analyzed (Typ) then | |
6146 | return Empty; | |
6147 | end if; | |
6148 | ||
df3e68b1 HK |
6149 | Comp := First_Component (Typ); |
6150 | while Present (Comp) loop | |
6151 | if Chars (Comp) = Name_uObject then | |
6152 | return Base_Type (Etype (Comp)); | |
6153 | end if; | |
6154 | ||
6155 | Next_Component (Comp); | |
6156 | end loop; | |
6157 | ||
6158 | -- The corresponding record of a protected type should always have an | |
6159 | -- _object field. | |
6160 | ||
6161 | raise Program_Error; | |
6162 | end Find_Protection_Type; | |
6163 | ||
e59243fa AC |
6164 | ----------------------- |
6165 | -- Find_Hook_Context -- | |
6166 | ----------------------- | |
6167 | ||
6168 | function Find_Hook_Context (N : Node_Id) return Node_Id is | |
6169 | Par : Node_Id; | |
6170 | Top : Node_Id; | |
6171 | ||
6172 | Wrapped_Node : Node_Id; | |
6173 | -- Note: if we are in a transient scope, we want to reuse it as | |
6174 | -- the context for actions insertion, if possible. But if N is itself | |
6175 | -- part of the stored actions for the current transient scope, | |
6176 | -- then we need to insert at the appropriate (inner) location in | |
6177 | -- the not as an action on Node_To_Be_Wrapped. | |
6178 | ||
6179 | In_Cond_Expr : constant Boolean := Within_Case_Or_If_Expression (N); | |
6180 | ||
6181 | begin | |
6182 | -- When the node is inside a case/if expression, the lifetime of any | |
6183 | -- temporary controlled object is extended. Find a suitable insertion | |
6184 | -- node by locating the topmost case or if expressions. | |
6185 | ||
6186 | if In_Cond_Expr then | |
6187 | Par := N; | |
6188 | Top := N; | |
6189 | while Present (Par) loop | |
4a08c95c AC |
6190 | if Nkind (Original_Node (Par)) in |
6191 | N_Case_Expression | N_If_Expression | |
e59243fa AC |
6192 | then |
6193 | Top := Par; | |
6194 | ||
6195 | -- Prevent the search from going too far | |
6196 | ||
6197 | elsif Is_Body_Or_Package_Declaration (Par) then | |
6198 | exit; | |
6199 | end if; | |
6200 | ||
6201 | Par := Parent (Par); | |
6202 | end loop; | |
6203 | ||
6204 | -- The topmost case or if expression is now recovered, but it may | |
6205 | -- still not be the correct place to add generated code. Climb to | |
6206 | -- find a parent that is part of a declarative or statement list, | |
6207 | -- and is not a list of actuals in a call. | |
6208 | ||
6209 | Par := Top; | |
6210 | while Present (Par) loop | |
6211 | if Is_List_Member (Par) | |
4a08c95c AC |
6212 | and then Nkind (Par) not in N_Component_Association |
6213 | | N_Discriminant_Association | |
6214 | | N_Parameter_Association | |
6215 | | N_Pragma_Argument_Association | |
6216 | and then Nkind (Parent (Par)) not in N_Function_Call | |
6217 | | N_Procedure_Call_Statement | |
6218 | | N_Entry_Call_Statement | |
e59243fa AC |
6219 | |
6220 | then | |
6221 | return Par; | |
6222 | ||
6223 | -- Prevent the search from going too far | |
6224 | ||
6225 | elsif Is_Body_Or_Package_Declaration (Par) then | |
6226 | exit; | |
6227 | end if; | |
6228 | ||
6229 | Par := Parent (Par); | |
6230 | end loop; | |
6231 | ||
6232 | return Par; | |
6233 | ||
6234 | else | |
6235 | Par := N; | |
6236 | while Present (Par) loop | |
6237 | ||
6238 | -- Keep climbing past various operators | |
6239 | ||
6240 | if Nkind (Parent (Par)) in N_Op | |
4a08c95c | 6241 | or else Nkind (Parent (Par)) in N_And_Then | N_Or_Else |
e59243fa AC |
6242 | then |
6243 | Par := Parent (Par); | |
6244 | else | |
6245 | exit; | |
6246 | end if; | |
6247 | end loop; | |
6248 | ||
6249 | Top := Par; | |
6250 | ||
6251 | -- The node may be located in a pragma in which case return the | |
6252 | -- pragma itself: | |
6253 | ||
6254 | -- pragma Precondition (... and then Ctrl_Func_Call ...); | |
6255 | ||
6256 | -- Similar case occurs when the node is related to an object | |
6257 | -- declaration or assignment: | |
6258 | ||
6259 | -- Obj [: Some_Typ] := ... and then Ctrl_Func_Call ...; | |
6260 | ||
6261 | -- Another case to consider is when the node is part of a return | |
6262 | -- statement: | |
6263 | ||
6264 | -- return ... and then Ctrl_Func_Call ...; | |
6265 | ||
6266 | -- Another case is when the node acts as a formal in a procedure | |
6267 | -- call statement: | |
6268 | ||
6269 | -- Proc (... and then Ctrl_Func_Call ...); | |
6270 | ||
6271 | if Scope_Is_Transient then | |
6272 | Wrapped_Node := Node_To_Be_Wrapped; | |
6273 | else | |
6274 | Wrapped_Node := Empty; | |
6275 | end if; | |
6276 | ||
6277 | while Present (Par) loop | |
6278 | if Par = Wrapped_Node | |
4a08c95c AC |
6279 | or else Nkind (Par) in N_Assignment_Statement |
6280 | | N_Object_Declaration | |
6281 | | N_Pragma | |
6282 | | N_Procedure_Call_Statement | |
6283 | | N_Simple_Return_Statement | |
e59243fa AC |
6284 | then |
6285 | return Par; | |
6286 | ||
6287 | -- Prevent the search from going too far | |
6288 | ||
6289 | elsif Is_Body_Or_Package_Declaration (Par) then | |
6290 | exit; | |
6291 | end if; | |
6292 | ||
6293 | Par := Parent (Par); | |
6294 | end loop; | |
6295 | ||
6296 | -- Return the topmost short circuit operator | |
6297 | ||
6298 | return Top; | |
6299 | end if; | |
6300 | end Find_Hook_Context; | |
6301 | ||
cd2c6027 AC |
6302 | ------------------------------ |
6303 | -- Following_Address_Clause -- | |
6304 | ------------------------------ | |
6305 | ||
cd2c6027 | 6306 | function Following_Address_Clause (D : Node_Id) return Node_Id is |
f2d9ae20 AC |
6307 | Id : constant Entity_Id := Defining_Identifier (D); |
6308 | Result : Node_Id; | |
6309 | Par : Node_Id; | |
6310 | ||
6311 | function Check_Decls (D : Node_Id) return Node_Id; | |
6312 | -- This internal function differs from the main function in that it | |
6313 | -- gets called to deal with a following package private part, and | |
6314 | -- it checks declarations starting with D (the main function checks | |
6315 | -- declarations following D). If D is Empty, then Empty is returned. | |
6316 | ||
6317 | ----------------- | |
6318 | -- Check_Decls -- | |
6319 | ----------------- | |
6320 | ||
6321 | function Check_Decls (D : Node_Id) return Node_Id is | |
6322 | Decl : Node_Id; | |
6323 | ||
6324 | begin | |
6325 | Decl := D; | |
6326 | while Present (Decl) loop | |
6327 | if Nkind (Decl) = N_At_Clause | |
6328 | and then Chars (Identifier (Decl)) = Chars (Id) | |
6329 | then | |
6330 | return Decl; | |
6331 | ||
6332 | elsif Nkind (Decl) = N_Attribute_Definition_Clause | |
6333 | and then Chars (Decl) = Name_Address | |
6334 | and then Chars (Name (Decl)) = Chars (Id) | |
6335 | then | |
6336 | return Decl; | |
6337 | end if; | |
6338 | ||
6339 | Next (Decl); | |
6340 | end loop; | |
6341 | ||
6342 | -- Otherwise not found, return Empty | |
6343 | ||
6344 | return Empty; | |
6345 | end Check_Decls; | |
6346 | ||
6347 | -- Start of processing for Following_Address_Clause | |
cd2c6027 AC |
6348 | |
6349 | begin | |
572f38e4 | 6350 | -- If parser detected no address clause for the identifier in question, |
de4ac038 | 6351 | -- then the answer is a quick NO, without the need for a search. |
572f38e4 | 6352 | |
a921e83c | 6353 | if not Get_Name_Table_Boolean1 (Chars (Id)) then |
572f38e4 AC |
6354 | return Empty; |
6355 | end if; | |
6356 | ||
6357 | -- Otherwise search current declarative unit | |
6358 | ||
f2d9ae20 | 6359 | Result := Check_Decls (Next (D)); |
cd2c6027 | 6360 | |
f2d9ae20 AC |
6361 | if Present (Result) then |
6362 | return Result; | |
6363 | end if; | |
cd2c6027 | 6364 | |
f2d9ae20 | 6365 | -- Check for possible package private part following |
cd2c6027 | 6366 | |
f2d9ae20 AC |
6367 | Par := Parent (D); |
6368 | ||
6369 | if Nkind (Par) = N_Package_Specification | |
6370 | and then Visible_Declarations (Par) = List_Containing (D) | |
6371 | and then Present (Private_Declarations (Par)) | |
6372 | then | |
6373 | -- Private part present, check declarations there | |
6374 | ||
6375 | return Check_Decls (First (Private_Declarations (Par))); | |
6376 | ||
6377 | else | |
6378 | -- No private part, clause not found, return Empty | |
6379 | ||
6380 | return Empty; | |
6381 | end if; | |
cd2c6027 AC |
6382 | end Following_Address_Clause; |
6383 | ||
70482933 RK |
6384 | ---------------------- |
6385 | -- Force_Evaluation -- | |
6386 | ---------------------- | |
6387 | ||
28c7180f RD |
6388 | procedure Force_Evaluation |
6389 | (Exp : Node_Id; | |
6390 | Name_Req : Boolean := False; | |
6391 | Related_Id : Entity_Id := Empty; | |
6392 | Is_Low_Bound : Boolean := False; | |
89d3b1a1 AC |
6393 | Is_High_Bound : Boolean := False; |
6394 | Mode : Force_Evaluation_Mode := Relaxed) | |
28c7180f | 6395 | is |
70482933 | 6396 | begin |
28c7180f | 6397 | Remove_Side_Effects |
494a7e45 AC |
6398 | (Exp => Exp, |
6399 | Name_Req => Name_Req, | |
6400 | Variable_Ref => True, | |
6401 | Renaming_Req => False, | |
6402 | Related_Id => Related_Id, | |
6403 | Is_Low_Bound => Is_Low_Bound, | |
6404 | Is_High_Bound => Is_High_Bound, | |
89d3b1a1 AC |
6405 | Check_Side_Effects => |
6406 | Is_Static_Expression (Exp) | |
6407 | or else Mode = Relaxed); | |
70482933 RK |
6408 | end Force_Evaluation; |
6409 | ||
afbcdf5e AC |
6410 | --------------------------------- |
6411 | -- Fully_Qualified_Name_String -- | |
6412 | --------------------------------- | |
6413 | ||
72267417 AC |
6414 | function Fully_Qualified_Name_String |
6415 | (E : Entity_Id; | |
6416 | Append_NUL : Boolean := True) return String_Id | |
6417 | is | |
afbcdf5e AC |
6418 | procedure Internal_Full_Qualified_Name (E : Entity_Id); |
6419 | -- Compute recursively the qualified name without NUL at the end, adding | |
6420 | -- it to the currently started string being generated | |
6421 | ||
6422 | ---------------------------------- | |
6423 | -- Internal_Full_Qualified_Name -- | |
6424 | ---------------------------------- | |
6425 | ||
6426 | procedure Internal_Full_Qualified_Name (E : Entity_Id) is | |
6427 | Ent : Entity_Id; | |
6428 | ||
6429 | begin | |
6430 | -- Deal properly with child units | |
6431 | ||
6432 | if Nkind (E) = N_Defining_Program_Unit_Name then | |
6433 | Ent := Defining_Identifier (E); | |
6434 | else | |
6435 | Ent := E; | |
6436 | end if; | |
6437 | ||
6438 | -- Compute qualification recursively (only "Standard" has no scope) | |
6439 | ||
6440 | if Present (Scope (Scope (Ent))) then | |
6441 | Internal_Full_Qualified_Name (Scope (Ent)); | |
6442 | Store_String_Char (Get_Char_Code ('.')); | |
6443 | end if; | |
6444 | ||
6445 | -- Every entity should have a name except some expanded blocks | |
6446 | -- don't bother about those. | |
6447 | ||
6448 | if Chars (Ent) = No_Name then | |
6449 | return; | |
6450 | end if; | |
6451 | ||
6452 | -- Generates the entity name in upper case | |
6453 | ||
6454 | Get_Decoded_Name_String (Chars (Ent)); | |
6455 | Set_All_Upper_Case; | |
6456 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
6457 | return; | |
6458 | end Internal_Full_Qualified_Name; | |
6459 | ||
6460 | -- Start of processing for Full_Qualified_Name | |
6461 | ||
6462 | begin | |
6463 | Start_String; | |
6464 | Internal_Full_Qualified_Name (E); | |
9d5598bf | 6465 | |
72267417 AC |
6466 | if Append_NUL then |
6467 | Store_String_Char (Get_Char_Code (ASCII.NUL)); | |
6468 | end if; | |
9d5598bf | 6469 | |
afbcdf5e AC |
6470 | return End_String; |
6471 | end Fully_Qualified_Name_String; | |
6472 | ||
fbf5a39b AC |
6473 | --------------------------------- |
6474 | -- Get_Current_Value_Condition -- | |
6475 | --------------------------------- | |
6476 | ||
05350ac6 BD |
6477 | -- Note: the implementation of this procedure is very closely tied to the |
6478 | -- implementation of Set_Current_Value_Condition. In the Get procedure, we | |
6479 | -- interpret Current_Value fields set by the Set procedure, so the two | |
6480 | -- procedures need to be closely coordinated. | |
6481 | ||
fbf5a39b AC |
6482 | procedure Get_Current_Value_Condition |
6483 | (Var : Node_Id; | |
6484 | Op : out Node_Kind; | |
6485 | Val : out Node_Id) | |
6486 | is | |
59e54267 ES |
6487 | Loc : constant Source_Ptr := Sloc (Var); |
6488 | Ent : constant Entity_Id := Entity (Var); | |
fbf5a39b | 6489 | |
b9348660 | 6490 | procedure Process_Current_Value_Condition (N : Node_Id; S : Boolean); |
05350ac6 BD |
6491 | -- N is an expression which holds either True (S = True) or False (S = |
6492 | -- False) in the condition. This procedure digs out the expression and | |
6493 | -- if it refers to Ent, sets Op and Val appropriately. | |
6494 | ||
6495 | ------------------------------------- | |
6496 | -- Process_Current_Value_Condition -- | |
6497 | ------------------------------------- | |
6498 | ||
6499 | procedure Process_Current_Value_Condition | |
6500 | (N : Node_Id; | |
6501 | S : Boolean) | |
6502 | is | |
064f4527 TQ |
6503 | Cond : Node_Id; |
6504 | Prev_Cond : Node_Id; | |
6505 | Sens : Boolean; | |
05350ac6 BD |
6506 | |
6507 | begin | |
6508 | Cond := N; | |
6509 | Sens := S; | |
6510 | ||
064f4527 TQ |
6511 | loop |
6512 | Prev_Cond := Cond; | |
05350ac6 | 6513 | |
064f4527 TQ |
6514 | -- Deal with NOT operators, inverting sense |
6515 | ||
6516 | while Nkind (Cond) = N_Op_Not loop | |
6517 | Cond := Right_Opnd (Cond); | |
6518 | Sens := not Sens; | |
6519 | end loop; | |
6520 | ||
6521 | -- Deal with conversions, qualifications, and expressions with | |
6522 | -- actions. | |
6523 | ||
4a08c95c AC |
6524 | while Nkind (Cond) in N_Type_Conversion |
6525 | | N_Qualified_Expression | |
6526 | | N_Expression_With_Actions | |
064f4527 TQ |
6527 | loop |
6528 | Cond := Expression (Cond); | |
6529 | end loop; | |
6530 | ||
6531 | exit when Cond = Prev_Cond; | |
05350ac6 BD |
6532 | end loop; |
6533 | ||
6534 | -- Deal with AND THEN and AND cases | |
6535 | ||
4a08c95c | 6536 | if Nkind (Cond) in N_And_Then | N_Op_And then |
0e564ab4 | 6537 | |
aa9a7dd7 AC |
6538 | -- Don't ever try to invert a condition that is of the form of an |
6539 | -- AND or AND THEN (since we are not doing sufficiently general | |
6540 | -- processing to allow this). | |
05350ac6 BD |
6541 | |
6542 | if Sens = False then | |
6543 | Op := N_Empty; | |
6544 | Val := Empty; | |
6545 | return; | |
6546 | end if; | |
6547 | ||
6548 | -- Recursively process AND and AND THEN branches | |
6549 | ||
6550 | Process_Current_Value_Condition (Left_Opnd (Cond), True); | |
b9348660 | 6551 | pragma Assert (Op'Valid); |
05350ac6 BD |
6552 | |
6553 | if Op /= N_Empty then | |
6554 | return; | |
6555 | end if; | |
6556 | ||
6557 | Process_Current_Value_Condition (Right_Opnd (Cond), True); | |
6558 | return; | |
6559 | ||
6560 | -- Case of relational operator | |
6561 | ||
6562 | elsif Nkind (Cond) in N_Op_Compare then | |
6563 | Op := Nkind (Cond); | |
6564 | ||
6565 | -- Invert sense of test if inverted test | |
6566 | ||
6567 | if Sens = False then | |
6568 | case Op is | |
6569 | when N_Op_Eq => Op := N_Op_Ne; | |
6570 | when N_Op_Ne => Op := N_Op_Eq; | |
6571 | when N_Op_Lt => Op := N_Op_Ge; | |
6572 | when N_Op_Gt => Op := N_Op_Le; | |
6573 | when N_Op_Le => Op := N_Op_Gt; | |
6574 | when N_Op_Ge => Op := N_Op_Lt; | |
6575 | when others => raise Program_Error; | |
6576 | end case; | |
6577 | end if; | |
6578 | ||
6579 | -- Case of entity op value | |
6580 | ||
6581 | if Is_Entity_Name (Left_Opnd (Cond)) | |
6582 | and then Ent = Entity (Left_Opnd (Cond)) | |
6583 | and then Compile_Time_Known_Value (Right_Opnd (Cond)) | |
6584 | then | |
6585 | Val := Right_Opnd (Cond); | |
6586 | ||
6587 | -- Case of value op entity | |
6588 | ||
6589 | elsif Is_Entity_Name (Right_Opnd (Cond)) | |
6590 | and then Ent = Entity (Right_Opnd (Cond)) | |
6591 | and then Compile_Time_Known_Value (Left_Opnd (Cond)) | |
6592 | then | |
6593 | Val := Left_Opnd (Cond); | |
6594 | ||
6595 | -- We are effectively swapping operands | |
6596 | ||
6597 | case Op is | |
6598 | when N_Op_Eq => null; | |
6599 | when N_Op_Ne => null; | |
6600 | when N_Op_Lt => Op := N_Op_Gt; | |
6601 | when N_Op_Gt => Op := N_Op_Lt; | |
6602 | when N_Op_Le => Op := N_Op_Ge; | |
6603 | when N_Op_Ge => Op := N_Op_Le; | |
6604 | when others => raise Program_Error; | |
6605 | end case; | |
6606 | ||
6607 | else | |
6608 | Op := N_Empty; | |
6609 | end if; | |
6610 | ||
6611 | return; | |
6612 | ||
4a08c95c AC |
6613 | elsif Nkind (Cond) in N_Type_Conversion |
6614 | | N_Qualified_Expression | |
6615 | | N_Expression_With_Actions | |
064f4527 TQ |
6616 | then |
6617 | Cond := Expression (Cond); | |
6618 | ||
6619 | -- Case of Boolean variable reference, return as though the | |
6620 | -- reference had said var = True. | |
05350ac6 BD |
6621 | |
6622 | else | |
0e564ab4 | 6623 | if Is_Entity_Name (Cond) and then Ent = Entity (Cond) then |
05350ac6 BD |
6624 | Val := New_Occurrence_Of (Standard_True, Sloc (Cond)); |
6625 | ||
6626 | if Sens = False then | |
6627 | Op := N_Op_Ne; | |
6628 | else | |
6629 | Op := N_Op_Eq; | |
6630 | end if; | |
6631 | end if; | |
6632 | end if; | |
6633 | end Process_Current_Value_Condition; | |
6634 | ||
6635 | -- Start of processing for Get_Current_Value_Condition | |
6636 | ||
fbf5a39b AC |
6637 | begin |
6638 | Op := N_Empty; | |
6639 | Val := Empty; | |
6640 | ||
59e54267 | 6641 | -- Immediate return, nothing doing, if this is not an object |
fbf5a39b | 6642 | |
a1447c2a | 6643 | if not Is_Object (Ent) then |
59e54267 ES |
6644 | return; |
6645 | end if; | |
fbf5a39b | 6646 | |
97847797 PT |
6647 | -- In GNATprove mode we don't want to use current value optimizer, in |
6648 | -- particular for loop invariant expressions and other assertions that | |
6649 | -- act as cut points for proof. The optimizer often folds expressions | |
6650 | -- into True/False where they trivially follow from the previous | |
6651 | -- assignments, but this deprives proof from the information needed to | |
6652 | -- discharge checks that are beyond the scope of the value optimizer. | |
6653 | ||
6654 | if GNATprove_Mode then | |
6655 | return; | |
6656 | end if; | |
6657 | ||
59e54267 | 6658 | -- Otherwise examine current value |
fbf5a39b | 6659 | |
59e54267 ES |
6660 | declare |
6661 | CV : constant Node_Id := Current_Value (Ent); | |
6662 | Sens : Boolean; | |
6663 | Stm : Node_Id; | |
fbf5a39b | 6664 | |
59e54267 ES |
6665 | begin |
6666 | -- If statement. Condition is known true in THEN section, known False | |
6667 | -- in any ELSIF or ELSE part, and unknown outside the IF statement. | |
fbf5a39b | 6668 | |
59e54267 | 6669 | if Nkind (CV) = N_If_Statement then |
fbf5a39b | 6670 | |
59e54267 | 6671 | -- Before start of IF statement |
fbf5a39b | 6672 | |
59e54267 ES |
6673 | if Loc < Sloc (CV) then |
6674 | return; | |
fbf5a39b | 6675 | |
8e334288 | 6676 | -- After end of IF statement |
fbf5a39b | 6677 | |
59e54267 ES |
6678 | elsif Loc >= Sloc (CV) + Text_Ptr (UI_To_Int (End_Span (CV))) then |
6679 | return; | |
6680 | end if; | |
fbf5a39b | 6681 | |
59e54267 ES |
6682 | -- At this stage we know that we are within the IF statement, but |
6683 | -- unfortunately, the tree does not record the SLOC of the ELSE so | |
6684 | -- we cannot use a simple SLOC comparison to distinguish between | |
6685 | -- the then/else statements, so we have to climb the tree. | |
fbf5a39b | 6686 | |
59e54267 ES |
6687 | declare |
6688 | N : Node_Id; | |
fbf5a39b | 6689 | |
59e54267 ES |
6690 | begin |
6691 | N := Parent (Var); | |
6692 | while Parent (N) /= CV loop | |
6693 | N := Parent (N); | |
fbf5a39b | 6694 | |
59e54267 ES |
6695 | -- If we fall off the top of the tree, then that's odd, but |
6696 | -- perhaps it could occur in some error situation, and the | |
6697 | -- safest response is simply to assume that the outcome of | |
6698 | -- the condition is unknown. No point in bombing during an | |
6699 | -- attempt to optimize things. | |
fbf5a39b | 6700 | |
59e54267 ES |
6701 | if No (N) then |
6702 | return; | |
6703 | end if; | |
6704 | end loop; | |
fbf5a39b | 6705 | |
59e54267 ES |
6706 | -- Now we have N pointing to a node whose parent is the IF |
6707 | -- statement in question, so now we can tell if we are within | |
6708 | -- the THEN statements. | |
fbf5a39b | 6709 | |
59e54267 ES |
6710 | if Is_List_Member (N) |
6711 | and then List_Containing (N) = Then_Statements (CV) | |
6712 | then | |
6713 | Sens := True; | |
fbf5a39b | 6714 | |
05350ac6 BD |
6715 | -- If the variable reference does not come from source, we |
6716 | -- cannot reliably tell whether it appears in the else part. | |
16b05213 | 6717 | -- In particular, if it appears in generated code for a node |
05350ac6 BD |
6718 | -- that requires finalization, it may be attached to a list |
6719 | -- that has not been yet inserted into the code. For now, | |
6720 | -- treat it as unknown. | |
6721 | ||
6722 | elsif not Comes_From_Source (N) then | |
6723 | return; | |
6724 | ||
6725 | -- Otherwise we must be in ELSIF or ELSE part | |
fbf5a39b | 6726 | |
59e54267 ES |
6727 | else |
6728 | Sens := False; | |
6729 | end if; | |
6730 | end; | |
fbf5a39b | 6731 | |
59e54267 | 6732 | -- ELSIF part. Condition is known true within the referenced |
aa9a7dd7 AC |
6733 | -- ELSIF, known False in any subsequent ELSIF or ELSE part, |
6734 | -- and unknown before the ELSE part or after the IF statement. | |
fbf5a39b | 6735 | |
59e54267 | 6736 | elsif Nkind (CV) = N_Elsif_Part then |
196379c6 ES |
6737 | |
6738 | -- if the Elsif_Part had condition_actions, the elsif has been | |
6739 | -- rewritten as a nested if, and the original elsif_part is | |
6740 | -- detached from the tree, so there is no way to obtain useful | |
6741 | -- information on the current value of the variable. | |
6742 | -- Can this be improved ??? | |
6743 | ||
6744 | if No (Parent (CV)) then | |
6745 | return; | |
6746 | end if; | |
6747 | ||
59e54267 | 6748 | Stm := Parent (CV); |
fbf5a39b | 6749 | |
a0a10853 AC |
6750 | -- If the tree has been otherwise rewritten there is nothing |
6751 | -- else to be done either. | |
6752 | ||
6753 | if Nkind (Stm) /= N_If_Statement then | |
6754 | return; | |
6755 | end if; | |
6756 | ||
59e54267 | 6757 | -- Before start of ELSIF part |
fbf5a39b | 6758 | |
59e54267 ES |
6759 | if Loc < Sloc (CV) then |
6760 | return; | |
fbf5a39b | 6761 | |
59e54267 | 6762 | -- After end of IF statement |
fbf5a39b | 6763 | |
59e54267 ES |
6764 | elsif Loc >= Sloc (Stm) + |
6765 | Text_Ptr (UI_To_Int (End_Span (Stm))) | |
6766 | then | |
6767 | return; | |
6768 | end if; | |
fbf5a39b | 6769 | |
59e54267 ES |
6770 | -- Again we lack the SLOC of the ELSE, so we need to climb the |
6771 | -- tree to see if we are within the ELSIF part in question. | |
fbf5a39b | 6772 | |
59e54267 ES |
6773 | declare |
6774 | N : Node_Id; | |
fbf5a39b | 6775 | |
59e54267 ES |
6776 | begin |
6777 | N := Parent (Var); | |
6778 | while Parent (N) /= Stm loop | |
6779 | N := Parent (N); | |
fbf5a39b | 6780 | |
59e54267 ES |
6781 | -- If we fall off the top of the tree, then that's odd, but |
6782 | -- perhaps it could occur in some error situation, and the | |
6783 | -- safest response is simply to assume that the outcome of | |
6784 | -- the condition is unknown. No point in bombing during an | |
6785 | -- attempt to optimize things. | |
fbf5a39b | 6786 | |
59e54267 ES |
6787 | if No (N) then |
6788 | return; | |
6789 | end if; | |
6790 | end loop; | |
fbf5a39b | 6791 | |
59e54267 ES |
6792 | -- Now we have N pointing to a node whose parent is the IF |
6793 | -- statement in question, so see if is the ELSIF part we want. | |
6794 | -- the THEN statements. | |
fbf5a39b | 6795 | |
59e54267 ES |
6796 | if N = CV then |
6797 | Sens := True; | |
fbf5a39b | 6798 | |
e14c931f | 6799 | -- Otherwise we must be in subsequent ELSIF or ELSE part |
fbf5a39b | 6800 | |
59e54267 ES |
6801 | else |
6802 | Sens := False; | |
6803 | end if; | |
6804 | end; | |
fbf5a39b | 6805 | |
05350ac6 BD |
6806 | -- Iteration scheme of while loop. The condition is known to be |
6807 | -- true within the body of the loop. | |
59e54267 | 6808 | |
05350ac6 BD |
6809 | elsif Nkind (CV) = N_Iteration_Scheme then |
6810 | declare | |
6811 | Loop_Stmt : constant Node_Id := Parent (CV); | |
fbf5a39b | 6812 | |
05350ac6 BD |
6813 | begin |
6814 | -- Before start of body of loop | |
fbf5a39b | 6815 | |
05350ac6 BD |
6816 | if Loc < Sloc (Loop_Stmt) then |
6817 | return; | |
fbf5a39b | 6818 | |
05350ac6 | 6819 | -- After end of LOOP statement |
59e54267 | 6820 | |
05350ac6 BD |
6821 | elsif Loc >= Sloc (End_Label (Loop_Stmt)) then |
6822 | return; | |
59e54267 | 6823 | |
05350ac6 | 6824 | -- We are within the body of the loop |
59e54267 | 6825 | |
05350ac6 BD |
6826 | else |
6827 | Sens := True; | |
6828 | end if; | |
6829 | end; | |
fbf5a39b | 6830 | |
05350ac6 | 6831 | -- All other cases of Current_Value settings |
fbf5a39b | 6832 | |
05350ac6 BD |
6833 | else |
6834 | return; | |
59e54267 | 6835 | end if; |
05350ac6 BD |
6836 | |
6837 | -- If we fall through here, then we have a reportable condition, Sens | |
6838 | -- is True if the condition is true and False if it needs inverting. | |
6839 | ||
6840 | Process_Current_Value_Condition (Condition (CV), Sens); | |
59e54267 | 6841 | end; |
fbf5a39b AC |
6842 | end Get_Current_Value_Condition; |
6843 | ||
3ebf0cbd PT |
6844 | ----------------------- |
6845 | -- Get_Index_Subtype -- | |
6846 | ----------------------- | |
6847 | ||
6848 | function Get_Index_Subtype (N : Node_Id) return Node_Id is | |
6849 | P_Type : Entity_Id := Etype (Prefix (N)); | |
6850 | Indx : Node_Id; | |
6851 | J : Int; | |
6852 | ||
6853 | begin | |
6854 | if Is_Access_Type (P_Type) then | |
6855 | P_Type := Designated_Type (P_Type); | |
6856 | end if; | |
6857 | ||
6858 | if No (Expressions (N)) then | |
6859 | J := 1; | |
6860 | else | |
6861 | J := UI_To_Int (Expr_Value (First (Expressions (N)))); | |
6862 | end if; | |
6863 | ||
6864 | Indx := First_Index (P_Type); | |
6865 | while J > 1 loop | |
6866 | Next_Index (Indx); | |
6867 | J := J - 1; | |
6868 | end loop; | |
6869 | ||
6870 | return Etype (Indx); | |
6871 | end Get_Index_Subtype; | |
6872 | ||
9eea4346 GB |
6873 | --------------------- |
6874 | -- Get_Stream_Size -- | |
6875 | --------------------- | |
6876 | ||
6877 | function Get_Stream_Size (E : Entity_Id) return Uint is | |
6878 | begin | |
6879 | -- If we have a Stream_Size clause for this type use it | |
6880 | ||
6881 | if Has_Stream_Size_Clause (E) then | |
6882 | return Static_Integer (Expression (Stream_Size_Clause (E))); | |
6883 | ||
90cb252f | 6884 | -- Otherwise the Stream_Size is the size of the type |
9eea4346 GB |
6885 | |
6886 | else | |
6887 | return Esize (E); | |
6888 | end if; | |
6889 | end Get_Stream_Size; | |
6890 | ||
df3e68b1 HK |
6891 | --------------------------- |
6892 | -- Has_Access_Constraint -- | |
6893 | --------------------------- | |
6894 | ||
6895 | function Has_Access_Constraint (E : Entity_Id) return Boolean is | |
6896 | Disc : Entity_Id; | |
6897 | T : constant Entity_Id := Etype (E); | |
6898 | ||
6899 | begin | |
0e564ab4 | 6900 | if Has_Per_Object_Constraint (E) and then Has_Discriminants (T) then |
df3e68b1 HK |
6901 | Disc := First_Discriminant (T); |
6902 | while Present (Disc) loop | |
6903 | if Is_Access_Type (Etype (Disc)) then | |
6904 | return True; | |
6905 | end if; | |
6906 | ||
6907 | Next_Discriminant (Disc); | |
6908 | end loop; | |
6909 | ||
6910 | return False; | |
6911 | else | |
6912 | return False; | |
6913 | end if; | |
6914 | end Has_Access_Constraint; | |
6915 | ||
70482933 RK |
6916 | -------------------- |
6917 | -- Homonym_Number -- | |
6918 | -------------------- | |
6919 | ||
c4f372c5 PT |
6920 | function Homonym_Number (Subp : Entity_Id) return Pos is |
6921 | Hom : Entity_Id := Homonym (Subp); | |
6922 | Count : Pos := 1; | |
70482933 RK |
6923 | |
6924 | begin | |
70482933 RK |
6925 | while Present (Hom) loop |
6926 | if Scope (Hom) = Scope (Subp) then | |
6927 | Count := Count + 1; | |
6928 | end if; | |
6929 | ||
6930 | Hom := Homonym (Hom); | |
6931 | end loop; | |
6932 | ||
6933 | return Count; | |
6934 | end Homonym_Number; | |
6935 | ||
df3e68b1 HK |
6936 | ----------------------------------- |
6937 | -- In_Library_Level_Package_Body -- | |
6938 | ----------------------------------- | |
6939 | ||
6940 | function In_Library_Level_Package_Body (Id : Entity_Id) return Boolean is | |
6941 | begin | |
6942 | -- First determine whether the entity appears at the library level, then | |
6943 | -- look at the containing unit. | |
6944 | ||
6945 | if Is_Library_Level_Entity (Id) then | |
6946 | declare | |
6947 | Container : constant Node_Id := Cunit (Get_Source_Unit (Id)); | |
6948 | ||
6949 | begin | |
6950 | return Nkind (Unit (Container)) = N_Package_Body; | |
6951 | end; | |
6952 | end if; | |
6953 | ||
6954 | return False; | |
6955 | end In_Library_Level_Package_Body; | |
6956 | ||
70482933 RK |
6957 | ------------------------------ |
6958 | -- In_Unconditional_Context -- | |
6959 | ------------------------------ | |
6960 | ||
6961 | function In_Unconditional_Context (Node : Node_Id) return Boolean is | |
6962 | P : Node_Id; | |
6963 | ||
6964 | begin | |
6965 | P := Node; | |
6966 | while Present (P) loop | |
6967 | case Nkind (P) is | |
d8f43ee6 HK |
6968 | when N_Subprogram_Body => return True; |
6969 | when N_If_Statement => return False; | |
6970 | when N_Loop_Statement => return False; | |
6971 | when N_Case_Statement => return False; | |
6972 | when others => P := Parent (P); | |
70482933 RK |
6973 | end case; |
6974 | end loop; | |
6975 | ||
6976 | return False; | |
6977 | end In_Unconditional_Context; | |
6978 | ||
6979 | ------------------- | |
6980 | -- Insert_Action -- | |
6981 | ------------------- | |
6982 | ||
e2819941 HK |
6983 | procedure Insert_Action |
6984 | (Assoc_Node : Node_Id; | |
6985 | Ins_Action : Node_Id; | |
6986 | Spec_Expr_OK : Boolean := False) | |
6987 | is | |
70482933 RK |
6988 | begin |
6989 | if Present (Ins_Action) then | |
e2819941 HK |
6990 | Insert_Actions |
6991 | (Assoc_Node => Assoc_Node, | |
6992 | Ins_Actions => New_List (Ins_Action), | |
6993 | Spec_Expr_OK => Spec_Expr_OK); | |
70482933 RK |
6994 | end if; |
6995 | end Insert_Action; | |
6996 | ||
6997 | -- Version with check(s) suppressed | |
6998 | ||
6999 | procedure Insert_Action | |
e2819941 HK |
7000 | (Assoc_Node : Node_Id; |
7001 | Ins_Action : Node_Id; | |
7002 | Suppress : Check_Id; | |
7003 | Spec_Expr_OK : Boolean := False) | |
70482933 RK |
7004 | is |
7005 | begin | |
e2819941 HK |
7006 | Insert_Actions |
7007 | (Assoc_Node => Assoc_Node, | |
7008 | Ins_Actions => New_List (Ins_Action), | |
7009 | Suppress => Suppress, | |
7010 | Spec_Expr_OK => Spec_Expr_OK); | |
70482933 RK |
7011 | end Insert_Action; |
7012 | ||
df3e68b1 HK |
7013 | ------------------------- |
7014 | -- Insert_Action_After -- | |
7015 | ------------------------- | |
7016 | ||
7017 | procedure Insert_Action_After | |
7018 | (Assoc_Node : Node_Id; | |
7019 | Ins_Action : Node_Id) | |
7020 | is | |
7021 | begin | |
7022 | Insert_Actions_After (Assoc_Node, New_List (Ins_Action)); | |
7023 | end Insert_Action_After; | |
7024 | ||
70482933 RK |
7025 | -------------------- |
7026 | -- Insert_Actions -- | |
7027 | -------------------- | |
7028 | ||
e2819941 HK |
7029 | procedure Insert_Actions |
7030 | (Assoc_Node : Node_Id; | |
7031 | Ins_Actions : List_Id; | |
7032 | Spec_Expr_OK : Boolean := False) | |
7033 | is | |
70482933 RK |
7034 | N : Node_Id; |
7035 | P : Node_Id; | |
7036 | ||
7037 | Wrapped_Node : Node_Id := Empty; | |
7038 | ||
7039 | begin | |
7040 | if No (Ins_Actions) or else Is_Empty_List (Ins_Actions) then | |
7041 | return; | |
7042 | end if; | |
7043 | ||
e2819941 HK |
7044 | -- Insert the action when the context is "Handling of Default and Per- |
7045 | -- Object Expressions" only when requested by the caller. | |
7046 | ||
7047 | if Spec_Expr_OK then | |
7048 | null; | |
7049 | ||
65df5b71 HK |
7050 | -- Ignore insert of actions from inside default expression (or other |
7051 | -- similar "spec expression") in the special spec-expression analyze | |
7052 | -- mode. Any insertions at this point have no relevance, since we are | |
7053 | -- only doing the analyze to freeze the types of any static expressions. | |
e2819941 HK |
7054 | -- See section "Handling of Default and Per-Object Expressions" in the |
7055 | -- spec of package Sem for further details. | |
70482933 | 7056 | |
e2819941 | 7057 | elsif In_Spec_Expression then |
70482933 RK |
7058 | return; |
7059 | end if; | |
7060 | ||
7061 | -- If the action derives from stuff inside a record, then the actions | |
7062 | -- are attached to the current scope, to be inserted and analyzed on | |
273adcdf AC |
7063 | -- exit from the scope. The reason for this is that we may also be |
7064 | -- generating freeze actions at the same time, and they must eventually | |
7065 | -- be elaborated in the correct order. | |
70482933 RK |
7066 | |
7067 | if Is_Record_Type (Current_Scope) | |
7068 | and then not Is_Frozen (Current_Scope) | |
7069 | then | |
7070 | if No (Scope_Stack.Table | |
7fcd29e0 | 7071 | (Scope_Stack.Last).Pending_Freeze_Actions) |
70482933 RK |
7072 | then |
7073 | Scope_Stack.Table (Scope_Stack.Last).Pending_Freeze_Actions := | |
7074 | Ins_Actions; | |
7075 | else | |
7076 | Append_List | |
7077 | (Ins_Actions, | |
7078 | Scope_Stack.Table (Scope_Stack.Last).Pending_Freeze_Actions); | |
7079 | end if; | |
7080 | ||
7081 | return; | |
7082 | end if; | |
7083 | ||
7084 | -- We now intend to climb up the tree to find the right point to | |
273adcdf AC |
7085 | -- insert the actions. We start at Assoc_Node, unless this node is a |
7086 | -- subexpression in which case we start with its parent. We do this for | |
7087 | -- two reasons. First it speeds things up. Second, if Assoc_Node is | |
7088 | -- itself one of the special nodes like N_And_Then, then we assume that | |
7089 | -- an initial request to insert actions for such a node does not expect | |
7090 | -- the actions to get deposited in the node for later handling when the | |
7091 | -- node is expanded, since clearly the node is being dealt with by the | |
7092 | -- caller. Note that in the subexpression case, N is always the child we | |
7093 | -- came from. | |
7094 | ||
9bdc432a AC |
7095 | -- N_Raise_xxx_Error is an annoying special case, it is a statement |
7096 | -- if it has type Standard_Void_Type, and a subexpression otherwise. | |
7097 | -- Procedure calls, and similarly procedure attribute references, are | |
7098 | -- also statements. | |
70482933 RK |
7099 | |
7100 | if Nkind (Assoc_Node) in N_Subexpr | |
a52e6d7e | 7101 | and then (Nkind (Assoc_Node) not in N_Raise_xxx_Error |
70482933 | 7102 | or else Etype (Assoc_Node) /= Standard_Void_Type) |
a52e6d7e | 7103 | and then Nkind (Assoc_Node) /= N_Procedure_Call_Statement |
70482933 | 7104 | and then (Nkind (Assoc_Node) /= N_Attribute_Reference |
c5c780e6 HK |
7105 | or else not Is_Procedure_Attribute_Name |
7106 | (Attribute_Name (Assoc_Node))) | |
70482933 | 7107 | then |
a52e6d7e AC |
7108 | N := Assoc_Node; |
7109 | P := Parent (Assoc_Node); | |
70482933 | 7110 | |
3f833dc2 GD |
7111 | -- Nonsubexpression case. Note that N is initially Empty in this case |
7112 | -- (N is only guaranteed non-Empty in the subexpr case). | |
70482933 RK |
7113 | |
7114 | else | |
70482933 | 7115 | N := Empty; |
a52e6d7e | 7116 | P := Assoc_Node; |
70482933 RK |
7117 | end if; |
7118 | ||
7119 | -- Capture root of the transient scope | |
7120 | ||
7121 | if Scope_Is_Transient then | |
05350ac6 | 7122 | Wrapped_Node := Node_To_Be_Wrapped; |
70482933 RK |
7123 | end if; |
7124 | ||
7125 | loop | |
7126 | pragma Assert (Present (P)); | |
7127 | ||
a52e6d7e AC |
7128 | -- Make sure that inserted actions stay in the transient scope |
7129 | ||
7130 | if Present (Wrapped_Node) and then N = Wrapped_Node then | |
7131 | Store_Before_Actions_In_Scope (Ins_Actions); | |
7132 | return; | |
7133 | end if; | |
7134 | ||
70482933 RK |
7135 | case Nkind (P) is |
7136 | ||
7137 | -- Case of right operand of AND THEN or OR ELSE. Put the actions | |
7138 | -- in the Actions field of the right operand. They will be moved | |
7139 | -- out further when the AND THEN or OR ELSE operator is expanded. | |
7140 | -- Nothing special needs to be done for the left operand since | |
7141 | -- in that case the actions are executed unconditionally. | |
7142 | ||
ac7120ce | 7143 | when N_Short_Circuit => |
70482933 | 7144 | if N = Right_Opnd (P) then |
ac4d6407 RD |
7145 | |
7146 | -- We are now going to either append the actions to the | |
7147 | -- actions field of the short-circuit operation. We will | |
7148 | -- also analyze the actions now. | |
7149 | ||
7150 | -- This analysis is really too early, the proper thing would | |
7151 | -- be to just park them there now, and only analyze them if | |
7152 | -- we find we really need them, and to it at the proper | |
7153 | -- final insertion point. However attempting to this proved | |
7154 | -- tricky, so for now we just kill current values before and | |
7155 | -- after the analyze call to make sure we avoid peculiar | |
7156 | -- optimizations from this out of order insertion. | |
7157 | ||
7158 | Kill_Current_Values; | |
7159 | ||
2e70d415 AC |
7160 | -- If P has already been expanded, we can't park new actions |
7161 | -- on it, so we need to expand them immediately, introducing | |
7162 | -- an Expression_With_Actions. N can't be an expression | |
7163 | -- with actions, or else then the actions would have been | |
7164 | -- inserted at an inner level. | |
7165 | ||
7166 | if Analyzed (P) then | |
7167 | pragma Assert (Nkind (N) /= N_Expression_With_Actions); | |
7168 | Rewrite (N, | |
7169 | Make_Expression_With_Actions (Sloc (N), | |
7170 | Actions => Ins_Actions, | |
7171 | Expression => Relocate_Node (N))); | |
7172 | Analyze_And_Resolve (N); | |
7173 | ||
7174 | elsif Present (Actions (P)) then | |
70482933 | 7175 | Insert_List_After_And_Analyze |
ac4d6407 | 7176 | (Last (Actions (P)), Ins_Actions); |
70482933 RK |
7177 | else |
7178 | Set_Actions (P, Ins_Actions); | |
7179 | Analyze_List (Actions (P)); | |
7180 | end if; | |
7181 | ||
ac4d6407 RD |
7182 | Kill_Current_Values; |
7183 | ||
70482933 RK |
7184 | return; |
7185 | end if; | |
7186 | ||
9b16cb57 RD |
7187 | -- Then or Else dependent expression of an if expression. Add |
7188 | -- actions to Then_Actions or Else_Actions field as appropriate. | |
7189 | -- The actions will be moved further out when the if is expanded. | |
70482933 | 7190 | |
9b16cb57 | 7191 | when N_If_Expression => |
70482933 RK |
7192 | declare |
7193 | ThenX : constant Node_Id := Next (First (Expressions (P))); | |
7194 | ElseX : constant Node_Id := Next (ThenX); | |
7195 | ||
7196 | begin | |
aa9a7dd7 AC |
7197 | -- If the enclosing expression is already analyzed, as |
7198 | -- is the case for nested elaboration checks, insert the | |
7199 | -- conditional further out. | |
70482933 | 7200 | |
aa9a7dd7 AC |
7201 | if Analyzed (P) then |
7202 | null; | |
7203 | ||
7204 | -- Actions belong to the then expression, temporarily place | |
9b16cb57 RD |
7205 | -- them as Then_Actions of the if expression. They will be |
7206 | -- moved to the proper place later when the if expression | |
7207 | -- is expanded. | |
aa9a7dd7 AC |
7208 | |
7209 | elsif N = ThenX then | |
70482933 RK |
7210 | if Present (Then_Actions (P)) then |
7211 | Insert_List_After_And_Analyze | |
7212 | (Last (Then_Actions (P)), Ins_Actions); | |
7213 | else | |
7214 | Set_Then_Actions (P, Ins_Actions); | |
7215 | Analyze_List (Then_Actions (P)); | |
7216 | end if; | |
7217 | ||
7218 | return; | |
7219 | ||
9b16cb57 RD |
7220 | -- Actions belong to the else expression, temporarily place |
7221 | -- them as Else_Actions of the if expression. They will be | |
7222 | -- moved to the proper place later when the if expression | |
7223 | -- is expanded. | |
70482933 RK |
7224 | |
7225 | elsif N = ElseX then | |
7226 | if Present (Else_Actions (P)) then | |
7227 | Insert_List_After_And_Analyze | |
7228 | (Last (Else_Actions (P)), Ins_Actions); | |
7229 | else | |
7230 | Set_Else_Actions (P, Ins_Actions); | |
7231 | Analyze_List (Else_Actions (P)); | |
7232 | end if; | |
7233 | ||
7234 | return; | |
7235 | ||
7236 | -- Actions belong to the condition. In this case they are | |
7237 | -- unconditionally executed, and so we can continue the | |
7238 | -- search for the proper insert point. | |
7239 | ||
7240 | else | |
7241 | null; | |
7242 | end if; | |
7243 | end; | |
7244 | ||
aa9a7dd7 AC |
7245 | -- Alternative of case expression, we place the action in the |
7246 | -- Actions field of the case expression alternative, this will | |
7247 | -- be handled when the case expression is expanded. | |
19d846a0 RD |
7248 | |
7249 | when N_Case_Expression_Alternative => | |
7250 | if Present (Actions (P)) then | |
7251 | Insert_List_After_And_Analyze | |
7252 | (Last (Actions (P)), Ins_Actions); | |
7253 | else | |
7254 | Set_Actions (P, Ins_Actions); | |
1c54829e | 7255 | Analyze_List (Actions (P)); |
19d846a0 RD |
7256 | end if; |
7257 | ||
7258 | return; | |
7259 | ||
a52e6d7e AC |
7260 | -- Case of appearing within an Expressions_With_Actions node. When |
7261 | -- the new actions come from the expression of the expression with | |
7262 | -- actions, they must be added to the existing actions. The other | |
7263 | -- alternative is when the new actions are related to one of the | |
2e70d415 | 7264 | -- existing actions of the expression with actions, and should |
f5f6d8d7 AC |
7265 | -- never reach here: if actions are inserted on a statement |
7266 | -- within the Actions of an expression with actions, or on some | |
cd5acda5 | 7267 | -- subexpression of such a statement, then the outermost proper |
2e70d415 AC |
7268 | -- insertion point is right before the statement, and we should |
7269 | -- never climb up as far as the N_Expression_With_Actions itself. | |
955871d3 AC |
7270 | |
7271 | when N_Expression_With_Actions => | |
a52e6d7e | 7272 | if N = Expression (P) then |
064f4527 TQ |
7273 | if Is_Empty_List (Actions (P)) then |
7274 | Append_List_To (Actions (P), Ins_Actions); | |
7275 | Analyze_List (Actions (P)); | |
7276 | else | |
7277 | Insert_List_After_And_Analyze | |
7278 | (Last (Actions (P)), Ins_Actions); | |
7279 | end if; | |
f5f6d8d7 | 7280 | |
72e9f2b9 | 7281 | return; |
2e70d415 AC |
7282 | |
7283 | else | |
7284 | raise Program_Error; | |
72e9f2b9 | 7285 | end if; |
955871d3 | 7286 | |
70482933 RK |
7287 | -- Case of appearing in the condition of a while expression or |
7288 | -- elsif. We insert the actions into the Condition_Actions field. | |
7289 | -- They will be moved further out when the while loop or elsif | |
7290 | -- is analyzed. | |
7291 | ||
d8f43ee6 HK |
7292 | when N_Elsif_Part |
7293 | | N_Iteration_Scheme | |
70482933 RK |
7294 | => |
7295 | if N = Condition (P) then | |
7296 | if Present (Condition_Actions (P)) then | |
7297 | Insert_List_After_And_Analyze | |
7298 | (Last (Condition_Actions (P)), Ins_Actions); | |
7299 | else | |
7300 | Set_Condition_Actions (P, Ins_Actions); | |
7301 | ||
aa9a7dd7 AC |
7302 | -- Set the parent of the insert actions explicitly. This |
7303 | -- is not a syntactic field, but we need the parent field | |
7304 | -- set, in particular so that freeze can understand that | |
7305 | -- it is dealing with condition actions, and properly | |
7306 | -- insert the freezing actions. | |
70482933 RK |
7307 | |
7308 | Set_Parent (Ins_Actions, P); | |
7309 | Analyze_List (Condition_Actions (P)); | |
7310 | end if; | |
7311 | ||
7312 | return; | |
7313 | end if; | |
7314 | ||
bebbff91 | 7315 | -- Statements, declarations, pragmas, representation clauses |
70482933 RK |
7316 | |
7317 | when | |
7318 | -- Statements | |
7319 | ||
d8f43ee6 HK |
7320 | N_Procedure_Call_Statement |
7321 | | N_Statement_Other_Than_Procedure_Call | |
70482933 RK |
7322 | |
7323 | -- Pragmas | |
7324 | ||
d8f43ee6 | 7325 | | N_Pragma |
70482933 RK |
7326 | |
7327 | -- Representation_Clause | |
7328 | ||
d8f43ee6 HK |
7329 | | N_At_Clause |
7330 | | N_Attribute_Definition_Clause | |
7331 | | N_Enumeration_Representation_Clause | |
7332 | | N_Record_Representation_Clause | |
70482933 RK |
7333 | |
7334 | -- Declarations | |
7335 | ||
d8f43ee6 HK |
7336 | | N_Abstract_Subprogram_Declaration |
7337 | | N_Entry_Body | |
7338 | | N_Exception_Declaration | |
7339 | | N_Exception_Renaming_Declaration | |
7340 | | N_Expression_Function | |
7341 | | N_Formal_Abstract_Subprogram_Declaration | |
7342 | | N_Formal_Concrete_Subprogram_Declaration | |
7343 | | N_Formal_Object_Declaration | |
7344 | | N_Formal_Type_Declaration | |
7345 | | N_Full_Type_Declaration | |
7346 | | N_Function_Instantiation | |
7347 | | N_Generic_Function_Renaming_Declaration | |
7348 | | N_Generic_Package_Declaration | |
7349 | | N_Generic_Package_Renaming_Declaration | |
7350 | | N_Generic_Procedure_Renaming_Declaration | |
7351 | | N_Generic_Subprogram_Declaration | |
7352 | | N_Implicit_Label_Declaration | |
7353 | | N_Incomplete_Type_Declaration | |
7354 | | N_Number_Declaration | |
7355 | | N_Object_Declaration | |
7356 | | N_Object_Renaming_Declaration | |
7357 | | N_Package_Body | |
7358 | | N_Package_Body_Stub | |
7359 | | N_Package_Declaration | |
7360 | | N_Package_Instantiation | |
7361 | | N_Package_Renaming_Declaration | |
7362 | | N_Private_Extension_Declaration | |
7363 | | N_Private_Type_Declaration | |
7364 | | N_Procedure_Instantiation | |
7365 | | N_Protected_Body | |
7366 | | N_Protected_Body_Stub | |
d8f43ee6 HK |
7367 | | N_Single_Task_Declaration |
7368 | | N_Subprogram_Body | |
7369 | | N_Subprogram_Body_Stub | |
7370 | | N_Subprogram_Declaration | |
7371 | | N_Subprogram_Renaming_Declaration | |
7372 | | N_Subtype_Declaration | |
7373 | | N_Task_Body | |
7374 | | N_Task_Body_Stub | |
70482933 | 7375 | |
8c889ae4 AC |
7376 | -- Use clauses can appear in lists of declarations |
7377 | ||
d8f43ee6 HK |
7378 | | N_Use_Package_Clause |
7379 | | N_Use_Type_Clause | |
8c889ae4 | 7380 | |
70482933 RK |
7381 | -- Freeze entity behaves like a declaration or statement |
7382 | ||
d8f43ee6 HK |
7383 | | N_Freeze_Entity |
7384 | | N_Freeze_Generic_Entity | |
70482933 RK |
7385 | => |
7386 | -- Do not insert here if the item is not a list member (this | |
7387 | -- happens for example with a triggering statement, and the | |
7388 | -- proper approach is to insert before the entire select). | |
7389 | ||
7390 | if not Is_List_Member (P) then | |
7391 | null; | |
7392 | ||
7393 | -- Do not insert if parent of P is an N_Component_Association | |
05350ac6 BD |
7394 | -- node (i.e. we are in the context of an N_Aggregate or |
7395 | -- N_Extension_Aggregate node. In this case we want to insert | |
7396 | -- before the entire aggregate. | |
70482933 RK |
7397 | |
7398 | elsif Nkind (Parent (P)) = N_Component_Association then | |
7399 | null; | |
7400 | ||
273adcdf AC |
7401 | -- Do not insert if the parent of P is either an N_Variant node |
7402 | -- or an N_Record_Definition node, meaning in either case that | |
7403 | -- P is a member of a component list, and that therefore the | |
7404 | -- actions should be inserted outside the complete record | |
7405 | -- declaration. | |
70482933 | 7406 | |
4a08c95c | 7407 | elsif Nkind (Parent (P)) in N_Variant | N_Record_Definition then |
70482933 RK |
7408 | null; |
7409 | ||
7410 | -- Do not insert freeze nodes within the loop generated for | |
7411 | -- an aggregate, because they may be elaborated too late for | |
7412 | -- subsequent use in the back end: within a package spec the | |
7413 | -- loop is part of the elaboration procedure and is only | |
7414 | -- elaborated during the second pass. | |
aa9a7dd7 | 7415 | |
273adcdf AC |
7416 | -- If the loop comes from source, or the entity is local to the |
7417 | -- loop itself it must remain within. | |
70482933 RK |
7418 | |
7419 | elsif Nkind (Parent (P)) = N_Loop_Statement | |
7420 | and then not Comes_From_Source (Parent (P)) | |
7421 | and then Nkind (First (Ins_Actions)) = N_Freeze_Entity | |
7422 | and then | |
7423 | Scope (Entity (First (Ins_Actions))) /= Current_Scope | |
7424 | then | |
7425 | null; | |
7426 | ||
7427 | -- Otherwise we can go ahead and do the insertion | |
7428 | ||
05350ac6 | 7429 | elsif P = Wrapped_Node then |
70482933 RK |
7430 | Store_Before_Actions_In_Scope (Ins_Actions); |
7431 | return; | |
7432 | ||
7433 | else | |
7434 | Insert_List_Before_And_Analyze (P, Ins_Actions); | |
7435 | return; | |
7436 | end if; | |
7437 | ||
076bbec1 ES |
7438 | -- the expansion of Task and protected type declarations can |
7439 | -- create declarations for temporaries which, like other actions | |
7440 | -- are inserted and analyzed before the current declaraation. | |
7441 | -- However, the current scope is the synchronized type, and | |
7442 | -- for unnesting it is critical that the proper scope for these | |
7443 | -- generated entities be the enclosing one. | |
7444 | ||
7445 | when N_Task_Type_Declaration | |
7446 | | N_Protected_Type_Declaration => | |
7447 | ||
7448 | Push_Scope (Scope (Current_Scope)); | |
7449 | Insert_List_Before_And_Analyze (P, Ins_Actions); | |
7450 | Pop_Scope; | |
7451 | return; | |
7452 | ||
aa9a7dd7 AC |
7453 | -- A special case, N_Raise_xxx_Error can act either as a statement |
7454 | -- or a subexpression. We tell the difference by looking at the | |
7455 | -- Etype. It is set to Standard_Void_Type in the statement case. | |
70482933 | 7456 | |
d8f43ee6 HK |
7457 | when N_Raise_xxx_Error => |
7458 | if Etype (P) = Standard_Void_Type then | |
7459 | if P = Wrapped_Node then | |
7460 | Store_Before_Actions_In_Scope (Ins_Actions); | |
7461 | else | |
7462 | Insert_List_Before_And_Analyze (P, Ins_Actions); | |
7463 | end if; | |
70482933 | 7464 | |
d8f43ee6 | 7465 | return; |
70482933 | 7466 | |
d8f43ee6 | 7467 | -- In the subexpression case, keep climbing |
70482933 | 7468 | |
d8f43ee6 HK |
7469 | else |
7470 | null; | |
7471 | end if; | |
70482933 RK |
7472 | |
7473 | -- If a component association appears within a loop created for | |
7474 | -- an array aggregate, attach the actions to the association so | |
7475 | -- they can be subsequently inserted within the loop. For other | |
fbf5a39b AC |
7476 | -- component associations insert outside of the aggregate. For |
7477 | -- an association that will generate a loop, its Loop_Actions | |
7478 | -- attribute is already initialized (see exp_aggr.adb). | |
70482933 | 7479 | |
d4bf622f | 7480 | -- The list of Loop_Actions can in turn generate additional ones, |
70482933 RK |
7481 | -- that are inserted before the associated node. If the associated |
7482 | -- node is outside the aggregate, the new actions are collected | |
d4bf622f | 7483 | -- at the end of the Loop_Actions, to respect the order in which |
70482933 RK |
7484 | -- they are to be elaborated. |
7485 | ||
a702c9b9 ES |
7486 | when N_Component_Association |
7487 | | N_Iterated_Component_Association | |
8092c199 | 7488 | | N_Iterated_Element_Association |
a702c9b9 ES |
7489 | => |
7490 | if Nkind (Parent (P)) = N_Aggregate | |
7491 | and then Present (Loop_Actions (P)) | |
7492 | then | |
7493 | if Is_Empty_List (Loop_Actions (P)) then | |
7494 | Set_Loop_Actions (P, Ins_Actions); | |
7495 | Analyze_List (Ins_Actions); | |
70482933 | 7496 | else |
a702c9b9 ES |
7497 | declare |
7498 | Decl : Node_Id; | |
7499 | ||
7500 | begin | |
7501 | -- Check whether these actions were generated by a | |
d4bf622f | 7502 | -- declaration that is part of the Loop_Actions for |
a702c9b9 ES |
7503 | -- the component_association. |
7504 | ||
7505 | Decl := Assoc_Node; | |
7506 | while Present (Decl) loop | |
7507 | exit when Parent (Decl) = P | |
7508 | and then Is_List_Member (Decl) | |
7509 | and then | |
7510 | List_Containing (Decl) = Loop_Actions (P); | |
7511 | Decl := Parent (Decl); | |
7512 | end loop; | |
7513 | ||
7514 | if Present (Decl) then | |
7515 | Insert_List_Before_And_Analyze | |
7516 | (Decl, Ins_Actions); | |
7517 | else | |
7518 | Insert_List_After_And_Analyze | |
7519 | (Last (Loop_Actions (P)), Ins_Actions); | |
7520 | end if; | |
7521 | end; | |
70482933 RK |
7522 | end if; |
7523 | ||
a702c9b9 ES |
7524 | return; |
7525 | ||
7526 | else | |
7527 | null; | |
7528 | end if; | |
7529 | ||
90e491a7 | 7530 | -- Special case: an attribute denoting a procedure call |
70482933 | 7531 | |
d8f43ee6 HK |
7532 | when N_Attribute_Reference => |
7533 | if Is_Procedure_Attribute_Name (Attribute_Name (P)) then | |
7534 | if P = Wrapped_Node then | |
7535 | Store_Before_Actions_In_Scope (Ins_Actions); | |
7536 | else | |
7537 | Insert_List_Before_And_Analyze (P, Ins_Actions); | |
7538 | end if; | |
70482933 | 7539 | |
d8f43ee6 | 7540 | return; |
70482933 | 7541 | |
d8f43ee6 | 7542 | -- In the subexpression case, keep climbing |
70482933 | 7543 | |
d8f43ee6 HK |
7544 | else |
7545 | null; | |
7546 | end if; | |
70482933 | 7547 | |
daf82dd8 | 7548 | -- Special case: a marker |
90e491a7 | 7549 | |
daf82dd8 HK |
7550 | when N_Call_Marker |
7551 | | N_Variable_Reference_Marker | |
7552 | => | |
90e491a7 PMR |
7553 | if Is_List_Member (P) then |
7554 | Insert_List_Before_And_Analyze (P, Ins_Actions); | |
7555 | return; | |
7556 | end if; | |
7557 | ||
dac3bede YM |
7558 | -- A contract node should not belong to the tree |
7559 | ||
7560 | when N_Contract => | |
7561 | raise Program_Error; | |
7562 | ||
70482933 RK |
7563 | -- For all other node types, keep climbing tree |
7564 | ||
d8f43ee6 HK |
7565 | when N_Abortable_Part |
7566 | | N_Accept_Alternative | |
7567 | | N_Access_Definition | |
7568 | | N_Access_Function_Definition | |
7569 | | N_Access_Procedure_Definition | |
7570 | | N_Access_To_Object_Definition | |
7571 | | N_Aggregate | |
7572 | | N_Allocator | |
7573 | | N_Aspect_Specification | |
7574 | | N_Case_Expression | |
7575 | | N_Case_Statement_Alternative | |
7576 | | N_Character_Literal | |
7577 | | N_Compilation_Unit | |
7578 | | N_Compilation_Unit_Aux | |
7579 | | N_Component_Clause | |
7580 | | N_Component_Declaration | |
7581 | | N_Component_Definition | |
7582 | | N_Component_List | |
7583 | | N_Constrained_Array_Definition | |
7584 | | N_Decimal_Fixed_Point_Definition | |
7585 | | N_Defining_Character_Literal | |
7586 | | N_Defining_Identifier | |
7587 | | N_Defining_Operator_Symbol | |
7588 | | N_Defining_Program_Unit_Name | |
7589 | | N_Delay_Alternative | |
9eb8d5b4 | 7590 | | N_Delta_Aggregate |
d8f43ee6 HK |
7591 | | N_Delta_Constraint |
7592 | | N_Derived_Type_Definition | |
7593 | | N_Designator | |
7594 | | N_Digits_Constraint | |
7595 | | N_Discriminant_Association | |
7596 | | N_Discriminant_Specification | |
7597 | | N_Empty | |
7598 | | N_Entry_Body_Formal_Part | |
7599 | | N_Entry_Call_Alternative | |
7600 | | N_Entry_Declaration | |
7601 | | N_Entry_Index_Specification | |
7602 | | N_Enumeration_Type_Definition | |
7603 | | N_Error | |
7604 | | N_Exception_Handler | |
7605 | | N_Expanded_Name | |
7606 | | N_Explicit_Dereference | |
7607 | | N_Extension_Aggregate | |
7608 | | N_Floating_Point_Definition | |
7609 | | N_Formal_Decimal_Fixed_Point_Definition | |
7610 | | N_Formal_Derived_Type_Definition | |
7611 | | N_Formal_Discrete_Type_Definition | |
7612 | | N_Formal_Floating_Point_Definition | |
7613 | | N_Formal_Modular_Type_Definition | |
7614 | | N_Formal_Ordinary_Fixed_Point_Definition | |
7615 | | N_Formal_Package_Declaration | |
7616 | | N_Formal_Private_Type_Definition | |
7617 | | N_Formal_Incomplete_Type_Definition | |
7618 | | N_Formal_Signed_Integer_Type_Definition | |
7619 | | N_Function_Call | |
7620 | | N_Function_Specification | |
7621 | | N_Generic_Association | |
7622 | | N_Handled_Sequence_Of_Statements | |
7623 | | N_Identifier | |
7624 | | N_In | |
7625 | | N_Index_Or_Discriminant_Constraint | |
7626 | | N_Indexed_Component | |
7627 | | N_Integer_Literal | |
7628 | | N_Iterator_Specification | |
7629 | | N_Itype_Reference | |
7630 | | N_Label | |
7631 | | N_Loop_Parameter_Specification | |
7632 | | N_Mod_Clause | |
7633 | | N_Modular_Type_Definition | |
7634 | | N_Not_In | |
7635 | | N_Null | |
7636 | | N_Op_Abs | |
7637 | | N_Op_Add | |
7638 | | N_Op_And | |
7639 | | N_Op_Concat | |
7640 | | N_Op_Divide | |
7641 | | N_Op_Eq | |
7642 | | N_Op_Expon | |
7643 | | N_Op_Ge | |
7644 | | N_Op_Gt | |
7645 | | N_Op_Le | |
7646 | | N_Op_Lt | |
7647 | | N_Op_Minus | |
7648 | | N_Op_Mod | |
7649 | | N_Op_Multiply | |
7650 | | N_Op_Ne | |
7651 | | N_Op_Not | |
7652 | | N_Op_Or | |
7653 | | N_Op_Plus | |
7654 | | N_Op_Rem | |
7655 | | N_Op_Rotate_Left | |
7656 | | N_Op_Rotate_Right | |
7657 | | N_Op_Shift_Left | |
7658 | | N_Op_Shift_Right | |
7659 | | N_Op_Shift_Right_Arithmetic | |
7660 | | N_Op_Subtract | |
7661 | | N_Op_Xor | |
7662 | | N_Operator_Symbol | |
7663 | | N_Ordinary_Fixed_Point_Definition | |
7664 | | N_Others_Choice | |
7665 | | N_Package_Specification | |
7666 | | N_Parameter_Association | |
7667 | | N_Parameter_Specification | |
7668 | | N_Pop_Constraint_Error_Label | |
7669 | | N_Pop_Program_Error_Label | |
7670 | | N_Pop_Storage_Error_Label | |
7671 | | N_Pragma_Argument_Association | |
7672 | | N_Procedure_Specification | |
7673 | | N_Protected_Definition | |
7674 | | N_Push_Constraint_Error_Label | |
7675 | | N_Push_Program_Error_Label | |
7676 | | N_Push_Storage_Error_Label | |
7677 | | N_Qualified_Expression | |
7678 | | N_Quantified_Expression | |
7679 | | N_Raise_Expression | |
7680 | | N_Range | |
7681 | | N_Range_Constraint | |
7682 | | N_Real_Literal | |
7683 | | N_Real_Range_Specification | |
7684 | | N_Record_Definition | |
7685 | | N_Reference | |
7686 | | N_SCIL_Dispatch_Table_Tag_Init | |
7687 | | N_SCIL_Dispatching_Call | |
7688 | | N_SCIL_Membership_Test | |
7689 | | N_Selected_Component | |
7690 | | N_Signed_Integer_Type_Definition | |
7691 | | N_Single_Protected_Declaration | |
7692 | | N_Slice | |
7693 | | N_String_Literal | |
7694 | | N_Subtype_Indication | |
7695 | | N_Subunit | |
ae33543c | 7696 | | N_Target_Name |
d8f43ee6 HK |
7697 | | N_Task_Definition |
7698 | | N_Terminate_Alternative | |
7699 | | N_Triggering_Alternative | |
7700 | | N_Type_Conversion | |
7701 | | N_Unchecked_Expression | |
7702 | | N_Unchecked_Type_Conversion | |
7703 | | N_Unconstrained_Array_Definition | |
7704 | | N_Unused_At_End | |
7705 | | N_Unused_At_Start | |
7706 | | N_Variant | |
7707 | | N_Variant_Part | |
7708 | | N_Validate_Unchecked_Conversion | |
7709 | | N_With_Clause | |
70482933 RK |
7710 | => |
7711 | null; | |
70482933 RK |
7712 | end case; |
7713 | ||
70482933 RK |
7714 | -- If we fall through above tests, keep climbing tree |
7715 | ||
7716 | N := P; | |
7717 | ||
7718 | if Nkind (Parent (N)) = N_Subunit then | |
7719 | ||
aa9a7dd7 AC |
7720 | -- This is the proper body corresponding to a stub. Insertion must |
7721 | -- be done at the point of the stub, which is in the declarative | |
7722 | -- part of the parent unit. | |
70482933 RK |
7723 | |
7724 | P := Corresponding_Stub (Parent (N)); | |
7725 | ||
7726 | else | |
7727 | P := Parent (N); | |
7728 | end if; | |
7729 | end loop; | |
70482933 RK |
7730 | end Insert_Actions; |
7731 | ||
7732 | -- Version with check(s) suppressed | |
7733 | ||
7734 | procedure Insert_Actions | |
e2819941 HK |
7735 | (Assoc_Node : Node_Id; |
7736 | Ins_Actions : List_Id; | |
7737 | Suppress : Check_Id; | |
7738 | Spec_Expr_OK : Boolean := False) | |
70482933 RK |
7739 | is |
7740 | begin | |
7741 | if Suppress = All_Checks then | |
7742 | declare | |
a7f1b24f | 7743 | Sva : constant Suppress_Array := Scope_Suppress.Suppress; |
70482933 | 7744 | begin |
a7f1b24f | 7745 | Scope_Suppress.Suppress := (others => True); |
e2819941 | 7746 | Insert_Actions (Assoc_Node, Ins_Actions, Spec_Expr_OK); |
a7f1b24f | 7747 | Scope_Suppress.Suppress := Sva; |
70482933 RK |
7748 | end; |
7749 | ||
7750 | else | |
7751 | declare | |
3217f71e | 7752 | Svg : constant Boolean := Scope_Suppress.Suppress (Suppress); |
70482933 | 7753 | begin |
3217f71e | 7754 | Scope_Suppress.Suppress (Suppress) := True; |
e2819941 | 7755 | Insert_Actions (Assoc_Node, Ins_Actions, Spec_Expr_OK); |
3217f71e | 7756 | Scope_Suppress.Suppress (Suppress) := Svg; |
70482933 RK |
7757 | end; |
7758 | end if; | |
7759 | end Insert_Actions; | |
7760 | ||
7761 | -------------------------- | |
7762 | -- Insert_Actions_After -- | |
7763 | -------------------------- | |
7764 | ||
7765 | procedure Insert_Actions_After | |
7766 | (Assoc_Node : Node_Id; | |
7767 | Ins_Actions : List_Id) | |
7768 | is | |
7769 | begin | |
0e564ab4 | 7770 | if Scope_Is_Transient and then Assoc_Node = Node_To_Be_Wrapped then |
70482933 RK |
7771 | Store_After_Actions_In_Scope (Ins_Actions); |
7772 | else | |
7773 | Insert_List_After_And_Analyze (Assoc_Node, Ins_Actions); | |
7774 | end if; | |
7775 | end Insert_Actions_After; | |
7776 | ||
e03f7ccf AC |
7777 | ------------------------ |
7778 | -- Insert_Declaration -- | |
7779 | ------------------------ | |
7780 | ||
7781 | procedure Insert_Declaration (N : Node_Id; Decl : Node_Id) is | |
7782 | P : Node_Id; | |
7783 | ||
7784 | begin | |
7785 | pragma Assert (Nkind (N) in N_Subexpr); | |
7786 | ||
7787 | -- Climb until we find a procedure or a package | |
7788 | ||
adb252d8 | 7789 | P := N; |
e03f7ccf | 7790 | loop |
adb252d8 AC |
7791 | pragma Assert (Present (Parent (P))); |
7792 | P := Parent (P); | |
7793 | ||
e03f7ccf | 7794 | if Is_List_Member (P) then |
4a08c95c AC |
7795 | exit when Nkind (Parent (P)) in |
7796 | N_Package_Specification | N_Subprogram_Body; | |
e03f7ccf AC |
7797 | |
7798 | -- Special handling for handled sequence of statements, we must | |
7799 | -- insert in the statements not the exception handlers! | |
7800 | ||
7801 | if Nkind (Parent (P)) = N_Handled_Sequence_Of_Statements then | |
7802 | P := First (Statements (Parent (P))); | |
7803 | exit; | |
7804 | end if; | |
7805 | end if; | |
e03f7ccf AC |
7806 | end loop; |
7807 | ||
7808 | -- Now do the insertion | |
7809 | ||
7810 | Insert_Before (P, Decl); | |
7811 | Analyze (Decl); | |
7812 | end Insert_Declaration; | |
7813 | ||
70482933 RK |
7814 | --------------------------------- |
7815 | -- Insert_Library_Level_Action -- | |
7816 | --------------------------------- | |
7817 | ||
7818 | procedure Insert_Library_Level_Action (N : Node_Id) is | |
7819 | Aux : constant Node_Id := Aux_Decls_Node (Cunit (Main_Unit)); | |
7820 | ||
7821 | begin | |
d6fd1f07 AC |
7822 | Push_Scope (Cunit_Entity (Current_Sem_Unit)); |
7823 | -- And not Main_Unit as previously. If the main unit is a body, | |
7824 | -- the scope needed to analyze the actions is the entity of the | |
7825 | -- corresponding declaration. | |
70482933 RK |
7826 | |
7827 | if No (Actions (Aux)) then | |
7828 | Set_Actions (Aux, New_List (N)); | |
7829 | else | |
7830 | Append (N, Actions (Aux)); | |
7831 | end if; | |
7832 | ||
7833 | Analyze (N); | |
7834 | Pop_Scope; | |
7835 | end Insert_Library_Level_Action; | |
7836 | ||
7837 | ---------------------------------- | |
7838 | -- Insert_Library_Level_Actions -- | |
7839 | ---------------------------------- | |
7840 | ||
7841 | procedure Insert_Library_Level_Actions (L : List_Id) is | |
7842 | Aux : constant Node_Id := Aux_Decls_Node (Cunit (Main_Unit)); | |
7843 | ||
7844 | begin | |
7845 | if Is_Non_Empty_List (L) then | |
0712790c ES |
7846 | Push_Scope (Cunit_Entity (Main_Unit)); |
7847 | -- ??? should this be Current_Sem_Unit instead of Main_Unit? | |
70482933 RK |
7848 | |
7849 | if No (Actions (Aux)) then | |
7850 | Set_Actions (Aux, L); | |
7851 | Analyze_List (L); | |
7852 | else | |
7853 | Insert_List_After_And_Analyze (Last (Actions (Aux)), L); | |
7854 | end if; | |
7855 | ||
7856 | Pop_Scope; | |
7857 | end if; | |
7858 | end Insert_Library_Level_Actions; | |
7859 | ||
7860 | ---------------------- | |
7861 | -- Inside_Init_Proc -- | |
7862 | ---------------------- | |
7863 | ||
7864 | function Inside_Init_Proc return Boolean is | |
341e0bb6 | 7865 | Proc : constant Entity_Id := Enclosing_Init_Proc; |
70482933 RK |
7866 | |
7867 | begin | |
341e0bb6 | 7868 | return Proc /= Empty; |
70482933 RK |
7869 | end Inside_Init_Proc; |
7870 | ||
c7c7dd3a EB |
7871 | ---------------------- |
7872 | -- Integer_Type_For -- | |
7873 | ---------------------- | |
7874 | ||
7875 | function Integer_Type_For (S : Uint; Uns : Boolean) return Entity_Id is | |
7876 | begin | |
7877 | pragma Assert (S <= System_Max_Integer_Size); | |
7878 | ||
7879 | -- This is the canonical 32-bit type | |
7880 | ||
7881 | if S <= Standard_Integer_Size then | |
7882 | if Uns then | |
7883 | return Standard_Unsigned; | |
7884 | else | |
7885 | return Standard_Integer; | |
7886 | end if; | |
7887 | ||
7888 | -- This is the canonical 64-bit type | |
7889 | ||
7890 | elsif S <= Standard_Long_Long_Integer_Size then | |
7891 | if Uns then | |
7892 | return Standard_Long_Long_Unsigned; | |
7893 | else | |
7894 | return Standard_Long_Long_Integer; | |
7895 | end if; | |
7896 | ||
a5476382 EB |
7897 | -- This is the canonical 128-bit type |
7898 | ||
7899 | elsif S <= Standard_Long_Long_Long_Integer_Size then | |
7900 | if Uns then | |
7901 | return Standard_Long_Long_Long_Unsigned; | |
7902 | else | |
7903 | return Standard_Long_Long_Long_Integer; | |
7904 | end if; | |
7905 | ||
c7c7dd3a EB |
7906 | else |
7907 | raise Program_Error; | |
7908 | end if; | |
7909 | end Integer_Type_For; | |
7910 | ||
a429e6b3 AC |
7911 | -------------------------------------------------- |
7912 | -- Is_Displacement_Of_Object_Or_Function_Result -- | |
7913 | -------------------------------------------------- | |
aab08130 | 7914 | |
a429e6b3 | 7915 | function Is_Displacement_Of_Object_Or_Function_Result |
aab08130 AC |
7916 | (Obj_Id : Entity_Id) return Boolean |
7917 | is | |
a429e6b3 | 7918 | function Is_Controlled_Function_Call (N : Node_Id) return Boolean; |
5efb89d0 AC |
7919 | -- Determine whether node N denotes a controlled function call |
7920 | ||
7921 | function Is_Controlled_Indexing (N : Node_Id) return Boolean; | |
7922 | -- Determine whether node N denotes a generalized indexing form which | |
7923 | -- involves a controlled result. | |
aab08130 AC |
7924 | |
7925 | function Is_Displace_Call (N : Node_Id) return Boolean; | |
5efb89d0 | 7926 | -- Determine whether node N denotes a call to Ada.Tags.Displace |
aab08130 | 7927 | |
a429e6b3 AC |
7928 | function Is_Source_Object (N : Node_Id) return Boolean; |
7929 | -- Determine whether a particular node denotes a source object | |
7930 | ||
5efb89d0 AC |
7931 | function Strip (N : Node_Id) return Node_Id; |
7932 | -- Examine arbitrary node N by stripping various indirections and return | |
7933 | -- the "real" node. | |
7934 | ||
a429e6b3 AC |
7935 | --------------------------------- |
7936 | -- Is_Controlled_Function_Call -- | |
7937 | --------------------------------- | |
aab08130 | 7938 | |
a429e6b3 | 7939 | function Is_Controlled_Function_Call (N : Node_Id) return Boolean is |
5efb89d0 | 7940 | Expr : Node_Id; |
f307415a | 7941 | |
aab08130 | 7942 | begin |
36295779 | 7943 | -- When a function call appears in Object.Operation format, the |
34557478 HK |
7944 | -- original representation has several possible forms depending on |
7945 | -- the availability and form of actual parameters: | |
bb012790 | 7946 | |
a8a42b93 AC |
7947 | -- Obj.Func N_Selected_Component |
7948 | -- Obj.Func (Actual) N_Indexed_Component | |
7949 | -- Obj.Func (Formal => Actual) N_Function_Call, whose Name is an | |
7950 | -- N_Selected_Component | |
36295779 | 7951 | |
5efb89d0 | 7952 | Expr := Original_Node (N); |
442d1abb AC |
7953 | loop |
7954 | if Nkind (Expr) = N_Function_Call then | |
a8a42b93 AC |
7955 | Expr := Name (Expr); |
7956 | ||
a8a42b93 AC |
7957 | -- "Obj.Func (Actual)" case |
7958 | ||
442d1abb | 7959 | elsif Nkind (Expr) = N_Indexed_Component then |
36295779 | 7960 | Expr := Prefix (Expr); |
f307415a | 7961 | |
442d1abb | 7962 | -- "Obj.Func" or "Obj.Func (Formal => Actual) case |
a8a42b93 | 7963 | |
442d1abb | 7964 | elsif Nkind (Expr) = N_Selected_Component then |
36295779 | 7965 | Expr := Selector_Name (Expr); |
a8a42b93 | 7966 | |
442d1abb AC |
7967 | else |
7968 | exit; | |
7969 | end if; | |
7970 | end loop; | |
f307415a | 7971 | |
aab08130 | 7972 | return |
442d1abb AC |
7973 | Nkind (Expr) in N_Has_Entity |
7974 | and then Present (Entity (Expr)) | |
f307415a AC |
7975 | and then Ekind (Entity (Expr)) = E_Function |
7976 | and then Needs_Finalization (Etype (Entity (Expr))); | |
a429e6b3 | 7977 | end Is_Controlled_Function_Call; |
aab08130 | 7978 | |
5efb89d0 AC |
7979 | ---------------------------- |
7980 | -- Is_Controlled_Indexing -- | |
7981 | ---------------------------- | |
7982 | ||
7983 | function Is_Controlled_Indexing (N : Node_Id) return Boolean is | |
7984 | Expr : constant Node_Id := Original_Node (N); | |
7985 | ||
7986 | begin | |
7987 | return | |
7988 | Nkind (Expr) = N_Indexed_Component | |
7989 | and then Present (Generalized_Indexing (Expr)) | |
7990 | and then Needs_Finalization (Etype (Expr)); | |
7991 | end Is_Controlled_Indexing; | |
7992 | ||
aab08130 AC |
7993 | ---------------------- |
7994 | -- Is_Displace_Call -- | |
7995 | ---------------------- | |
7996 | ||
7997 | function Is_Displace_Call (N : Node_Id) return Boolean is | |
5efb89d0 | 7998 | Call : constant Node_Id := Strip (N); |
aab08130 AC |
7999 | |
8000 | begin | |
aab08130 | 8001 | return |
a429e6b3 AC |
8002 | Present (Call) |
8003 | and then Nkind (Call) = N_Function_Call | |
315f0c42 | 8004 | and then Nkind (Name (Call)) in N_Has_Entity |
aab08130 AC |
8005 | and then Is_RTE (Entity (Name (Call)), RE_Displace); |
8006 | end Is_Displace_Call; | |
8007 | ||
a429e6b3 AC |
8008 | ---------------------- |
8009 | -- Is_Source_Object -- | |
8010 | ---------------------- | |
8011 | ||
8012 | function Is_Source_Object (N : Node_Id) return Boolean is | |
5efb89d0 | 8013 | Obj : constant Node_Id := Strip (N); |
c23c86bb | 8014 | |
a429e6b3 | 8015 | begin |
5efb89d0 AC |
8016 | return |
8017 | Present (Obj) | |
8018 | and then Comes_From_Source (Obj) | |
8019 | and then Nkind (Obj) in N_Has_Entity | |
8020 | and then Is_Object (Entity (Obj)); | |
8021 | end Is_Source_Object; | |
8022 | ||
8023 | ----------- | |
8024 | -- Strip -- | |
8025 | ----------- | |
c23c86bb | 8026 | |
5efb89d0 AC |
8027 | function Strip (N : Node_Id) return Node_Id is |
8028 | Result : Node_Id; | |
8029 | ||
8030 | begin | |
8031 | Result := N; | |
c23c86bb | 8032 | loop |
5efb89d0 AC |
8033 | if Nkind (Result) = N_Explicit_Dereference then |
8034 | Result := Prefix (Result); | |
c23c86bb | 8035 | |
4a08c95c AC |
8036 | elsif Nkind (Result) in |
8037 | N_Type_Conversion | N_Unchecked_Type_Conversion | |
c23c86bb | 8038 | then |
5efb89d0 | 8039 | Result := Expression (Result); |
c23c86bb AC |
8040 | |
8041 | else | |
8042 | exit; | |
8043 | end if; | |
8044 | end loop; | |
8045 | ||
5efb89d0 AC |
8046 | return Result; |
8047 | end Strip; | |
a429e6b3 | 8048 | |
aab08130 AC |
8049 | -- Local variables |
8050 | ||
5efb89d0 | 8051 | Obj_Decl : constant Node_Id := Declaration_Node (Obj_Id); |
aab08130 | 8052 | Obj_Typ : constant Entity_Id := Base_Type (Etype (Obj_Id)); |
5efb89d0 AC |
8053 | Orig_Decl : constant Node_Id := Original_Node (Obj_Decl); |
8054 | Orig_Expr : Node_Id; | |
aab08130 | 8055 | |
a429e6b3 | 8056 | -- Start of processing for Is_Displacement_Of_Object_Or_Function_Result |
aab08130 AC |
8057 | |
8058 | begin | |
a429e6b3 | 8059 | -- Case 1: |
aab08130 | 8060 | |
a429e6b3 | 8061 | -- Obj : CW_Type := Function_Call (...); |
aab08130 | 8062 | |
5efb89d0 | 8063 | -- is rewritten into: |
aab08130 | 8064 | |
5efb89d0 AC |
8065 | -- Temp : ... := Function_Call (...)'reference; |
8066 | -- Obj : CW_Type renames (... Ada.Tags.Displace (Temp)); | |
aab08130 | 8067 | |
a429e6b3 AC |
8068 | -- where the return type of the function and the class-wide type require |
8069 | -- dispatch table pointer displacement. | |
8070 | ||
8071 | -- Case 2: | |
8072 | ||
5efb89d0 AC |
8073 | -- Obj : CW_Type := Container (...); |
8074 | ||
8075 | -- is rewritten into: | |
8076 | ||
8077 | -- Temp : ... := Function_Call (Container, ...)'reference; | |
8078 | -- Obj : CW_Type renames (... Ada.Tags.Displace (Temp)); | |
8079 | ||
8080 | -- where the container element type and the class-wide type require | |
8081 | -- dispatch table pointer dispacement. | |
8082 | ||
8083 | -- Case 3: | |
8084 | ||
a429e6b3 AC |
8085 | -- Obj : CW_Type := Src_Obj; |
8086 | ||
5efb89d0 | 8087 | -- is rewritten into: |
a429e6b3 AC |
8088 | |
8089 | -- Obj : CW_Type renames (... Ada.Tags.Displace (Src_Obj)); | |
8090 | ||
8091 | -- where the type of the source object and the class-wide type require | |
aab08130 AC |
8092 | -- dispatch table pointer displacement. |
8093 | ||
5efb89d0 AC |
8094 | if Nkind (Obj_Decl) = N_Object_Renaming_Declaration |
8095 | and then Is_Class_Wide_Type (Obj_Typ) | |
8096 | and then Is_Displace_Call (Renamed_Object (Obj_Id)) | |
8097 | and then Nkind (Orig_Decl) = N_Object_Declaration | |
8098 | and then Comes_From_Source (Orig_Decl) | |
8099 | then | |
8100 | Orig_Expr := Expression (Orig_Decl); | |
8101 | ||
8102 | return | |
8103 | Is_Controlled_Function_Call (Orig_Expr) | |
8104 | or else Is_Controlled_Indexing (Orig_Expr) | |
8105 | or else Is_Source_Object (Orig_Expr); | |
8106 | end if; | |
8107 | ||
8108 | return False; | |
a429e6b3 | 8109 | end Is_Displacement_Of_Object_Or_Function_Result; |
aab08130 | 8110 | |
df3e68b1 HK |
8111 | ------------------------------ |
8112 | -- Is_Finalizable_Transient -- | |
8113 | ------------------------------ | |
8114 | ||
8115 | function Is_Finalizable_Transient | |
8116 | (Decl : Node_Id; | |
8117 | Rel_Node : Node_Id) return Boolean | |
8118 | is | |
f7bb41af AC |
8119 | Obj_Id : constant Entity_Id := Defining_Identifier (Decl); |
8120 | Obj_Typ : constant Entity_Id := Base_Type (Etype (Obj_Id)); | |
df3e68b1 HK |
8121 | |
8122 | function Initialized_By_Access (Trans_Id : Entity_Id) return Boolean; | |
8123 | -- Determine whether transient object Trans_Id is initialized either | |
8124 | -- by a function call which returns an access type or simply renames | |
8125 | -- another pointer. | |
8126 | ||
8127 | function Initialized_By_Aliased_BIP_Func_Call | |
8128 | (Trans_Id : Entity_Id) return Boolean; | |
8129 | -- Determine whether transient object Trans_Id is initialized by a | |
8130 | -- build-in-place function call where the BIPalloc parameter is of | |
8131 | -- value 1 and BIPaccess is not null. This case creates an aliasing | |
8132 | -- between the returned value and the value denoted by BIPaccess. | |
8133 | ||
f7bb41af | 8134 | function Is_Aliased |
df3e68b1 HK |
8135 | (Trans_Id : Entity_Id; |
8136 | First_Stmt : Node_Id) return Boolean; | |
f7bb41af AC |
8137 | -- Determine whether transient object Trans_Id has been renamed or |
8138 | -- aliased through 'reference in the statement list starting from | |
8139 | -- First_Stmt. | |
8140 | ||
8141 | function Is_Allocated (Trans_Id : Entity_Id) return Boolean; | |
8142 | -- Determine whether transient object Trans_Id is allocated on the heap | |
df3e68b1 | 8143 | |
2f7b7467 AC |
8144 | function Is_Iterated_Container |
8145 | (Trans_Id : Entity_Id; | |
8146 | First_Stmt : Node_Id) return Boolean; | |
8147 | -- Determine whether transient object Trans_Id denotes a container which | |
8148 | -- is in the process of being iterated in the statement list starting | |
8149 | -- from First_Stmt. | |
8150 | ||
13209acd AC |
8151 | function Is_Part_Of_BIP_Return_Statement (N : Node_Id) return Boolean; |
8152 | -- Return True if N is directly part of a build-in-place return | |
8153 | -- statement. | |
8154 | ||
df3e68b1 HK |
8155 | --------------------------- |
8156 | -- Initialized_By_Access -- | |
8157 | --------------------------- | |
8158 | ||
8159 | function Initialized_By_Access (Trans_Id : Entity_Id) return Boolean is | |
8160 | Expr : constant Node_Id := Expression (Parent (Trans_Id)); | |
8161 | ||
8162 | begin | |
8163 | return | |
8164 | Present (Expr) | |
8165 | and then Nkind (Expr) /= N_Reference | |
8166 | and then Is_Access_Type (Etype (Expr)); | |
8167 | end Initialized_By_Access; | |
8168 | ||
8169 | ------------------------------------------ | |
8170 | -- Initialized_By_Aliased_BIP_Func_Call -- | |
8171 | ------------------------------------------ | |
8172 | ||
8173 | function Initialized_By_Aliased_BIP_Func_Call | |
8174 | (Trans_Id : Entity_Id) return Boolean | |
8175 | is | |
8176 | Call : Node_Id := Expression (Parent (Trans_Id)); | |
8177 | ||
8178 | begin | |
8179 | -- Build-in-place calls usually appear in 'reference format | |
8180 | ||
8181 | if Nkind (Call) = N_Reference then | |
8182 | Call := Prefix (Call); | |
8183 | end if; | |
8184 | ||
d4dfb005 BD |
8185 | Call := Unqual_Conv (Call); |
8186 | ||
df3e68b1 HK |
8187 | if Is_Build_In_Place_Function_Call (Call) then |
8188 | declare | |
8189 | Access_Nam : Name_Id := No_Name; | |
8190 | Access_OK : Boolean := False; | |
8191 | Actual : Node_Id; | |
8192 | Alloc_Nam : Name_Id := No_Name; | |
8193 | Alloc_OK : Boolean := False; | |
8194 | Formal : Node_Id; | |
8195 | Func_Id : Entity_Id; | |
8196 | Param : Node_Id; | |
8197 | ||
8198 | begin | |
8199 | -- Examine all parameter associations of the function call | |
8200 | ||
8201 | Param := First (Parameter_Associations (Call)); | |
8202 | while Present (Param) loop | |
8203 | if Nkind (Param) = N_Parameter_Association | |
8204 | and then Nkind (Selector_Name (Param)) = N_Identifier | |
8205 | then | |
8206 | Actual := Explicit_Actual_Parameter (Param); | |
8207 | Formal := Selector_Name (Param); | |
8208 | ||
8209 | -- Construct the names of formals BIPaccess and BIPalloc | |
8210 | -- using the function name retrieved from an arbitrary | |
8211 | -- formal. | |
8212 | ||
8213 | if Access_Nam = No_Name | |
8214 | and then Alloc_Nam = No_Name | |
8215 | and then Present (Entity (Formal)) | |
8216 | then | |
8217 | Func_Id := Scope (Entity (Formal)); | |
8218 | ||
8219 | Access_Nam := | |
8220 | New_External_Name (Chars (Func_Id), | |
8221 | BIP_Formal_Suffix (BIP_Object_Access)); | |
8222 | ||
8223 | Alloc_Nam := | |
8224 | New_External_Name (Chars (Func_Id), | |
8225 | BIP_Formal_Suffix (BIP_Alloc_Form)); | |
8226 | end if; | |
8227 | ||
8228 | -- A match for BIPaccess => Temp has been found | |
8229 | ||
8230 | if Chars (Formal) = Access_Nam | |
8231 | and then Nkind (Actual) /= N_Null | |
8232 | then | |
8233 | Access_OK := True; | |
8234 | end if; | |
8235 | ||
8236 | -- A match for BIPalloc => 1 has been found | |
8237 | ||
8238 | if Chars (Formal) = Alloc_Nam | |
8239 | and then Nkind (Actual) = N_Integer_Literal | |
8240 | and then Intval (Actual) = Uint_1 | |
8241 | then | |
8242 | Alloc_OK := True; | |
8243 | end if; | |
8244 | end if; | |
8245 | ||
8246 | Next (Param); | |
8247 | end loop; | |
8248 | ||
0e564ab4 | 8249 | return Access_OK and Alloc_OK; |
df3e68b1 HK |
8250 | end; |
8251 | end if; | |
8252 | ||
8253 | return False; | |
8254 | end Initialized_By_Aliased_BIP_Func_Call; | |
8255 | ||
df3e68b1 | 8256 | ---------------- |
f7bb41af | 8257 | -- Is_Aliased -- |
df3e68b1 HK |
8258 | ---------------- |
8259 | ||
f7bb41af | 8260 | function Is_Aliased |
df3e68b1 HK |
8261 | (Trans_Id : Entity_Id; |
8262 | First_Stmt : Node_Id) return Boolean | |
8263 | is | |
c5f5123f | 8264 | function Find_Renamed_Object (Ren_Decl : Node_Id) return Entity_Id; |
df3e68b1 HK |
8265 | -- Given an object renaming declaration, retrieve the entity of the |
8266 | -- renamed name. Return Empty if the renamed name is anything other | |
8267 | -- than a variable or a constant. | |
8268 | ||
c5f5123f AC |
8269 | ------------------------- |
8270 | -- Find_Renamed_Object -- | |
8271 | ------------------------- | |
df3e68b1 | 8272 | |
c5f5123f AC |
8273 | function Find_Renamed_Object (Ren_Decl : Node_Id) return Entity_Id is |
8274 | Ren_Obj : Node_Id := Empty; | |
df3e68b1 | 8275 | |
c5f5123f AC |
8276 | function Find_Object (N : Node_Id) return Traverse_Result; |
8277 | -- Try to detect an object which is either a constant or a | |
8278 | -- variable. | |
0180fd26 | 8279 | |
c5f5123f AC |
8280 | ----------------- |
8281 | -- Find_Object -- | |
8282 | ----------------- | |
8283 | ||
8284 | function Find_Object (N : Node_Id) return Traverse_Result is | |
8285 | begin | |
8286 | -- Stop the search once a constant or a variable has been | |
8287 | -- detected. | |
8288 | ||
8289 | if Nkind (N) = N_Identifier | |
8290 | and then Present (Entity (N)) | |
4a08c95c | 8291 | and then Ekind (Entity (N)) in E_Constant | E_Variable |
0180fd26 | 8292 | then |
c5f5123f AC |
8293 | Ren_Obj := Entity (N); |
8294 | return Abandon; | |
df3e68b1 | 8295 | end if; |
df3e68b1 | 8296 | |
c5f5123f AC |
8297 | return OK; |
8298 | end Find_Object; | |
8299 | ||
8300 | procedure Search is new Traverse_Proc (Find_Object); | |
8301 | ||
8302 | -- Local variables | |
8303 | ||
8304 | Typ : constant Entity_Id := Etype (Defining_Identifier (Ren_Decl)); | |
8305 | ||
8306 | -- Start of processing for Find_Renamed_Object | |
8307 | ||
8308 | begin | |
8309 | -- Actions related to dispatching calls may appear as renamings of | |
8310 | -- tags. Do not process this type of renaming because it does not | |
8311 | -- use the actual value of the object. | |
8312 | ||
8313 | if not Is_RTE (Typ, RE_Tag_Ptr) then | |
8314 | Search (Name (Ren_Decl)); | |
df3e68b1 HK |
8315 | end if; |
8316 | ||
c5f5123f AC |
8317 | return Ren_Obj; |
8318 | end Find_Renamed_Object; | |
df3e68b1 | 8319 | |
f7bb41af | 8320 | -- Local variables |
df3e68b1 | 8321 | |
f7bb41af AC |
8322 | Expr : Node_Id; |
8323 | Ren_Obj : Entity_Id; | |
8324 | Stmt : Node_Id; | |
df3e68b1 | 8325 | |
f7bb41af | 8326 | -- Start of processing for Is_Aliased |
df3e68b1 | 8327 | |
f7bb41af | 8328 | begin |
4b17187f AC |
8329 | -- A controlled transient object is not considered aliased when it |
8330 | -- appears inside an expression_with_actions node even when there are | |
8331 | -- explicit aliases of it: | |
8332 | ||
8333 | -- do | |
937e9676 | 8334 | -- Trans_Id : Ctrl_Typ ...; -- transient object |
4b17187f AC |
8335 | -- Alias : ... := Trans_Id; -- object is aliased |
8336 | -- Val : constant Boolean := | |
8337 | -- ... Alias ...; -- aliasing ends | |
8338 | -- <finalize Trans_Id> -- object safe to finalize | |
8339 | -- in Val end; | |
8340 | ||
8341 | -- Expansion ensures that all aliases are encapsulated in the actions | |
8342 | -- list and do not leak to the expression by forcing the evaluation | |
8343 | -- of the expression. | |
8344 | ||
8345 | if Nkind (Rel_Node) = N_Expression_With_Actions then | |
8346 | return False; | |
f7bb41af | 8347 | |
4b17187f AC |
8348 | -- Otherwise examine the statements after the controlled transient |
8349 | -- object and look for various forms of aliasing. | |
df3e68b1 | 8350 | |
4b17187f AC |
8351 | else |
8352 | Stmt := First_Stmt; | |
8353 | while Present (Stmt) loop | |
8354 | if Nkind (Stmt) = N_Object_Declaration then | |
8355 | Expr := Expression (Stmt); | |
8356 | ||
8357 | -- Aliasing of the form: | |
8358 | -- Obj : ... := Trans_Id'reference; | |
8359 | ||
8360 | if Present (Expr) | |
8361 | and then Nkind (Expr) = N_Reference | |
8362 | and then Nkind (Prefix (Expr)) = N_Identifier | |
8363 | and then Entity (Prefix (Expr)) = Trans_Id | |
8364 | then | |
8365 | return True; | |
8366 | end if; | |
8367 | ||
8368 | elsif Nkind (Stmt) = N_Object_Renaming_Declaration then | |
8369 | Ren_Obj := Find_Renamed_Object (Stmt); | |
8370 | ||
8371 | -- Aliasing of the form: | |
8372 | -- Obj : ... renames ... Trans_Id ...; | |
8373 | ||
8374 | if Present (Ren_Obj) and then Ren_Obj = Trans_Id then | |
8375 | return True; | |
8376 | end if; | |
df3e68b1 | 8377 | end if; |
df3e68b1 | 8378 | |
4b17187f AC |
8379 | Next (Stmt); |
8380 | end loop; | |
df3e68b1 | 8381 | |
4b17187f AC |
8382 | return False; |
8383 | end if; | |
f7bb41af AC |
8384 | end Is_Aliased; |
8385 | ||
8386 | ------------------ | |
8387 | -- Is_Allocated -- | |
8388 | ------------------ | |
8389 | ||
8390 | function Is_Allocated (Trans_Id : Entity_Id) return Boolean is | |
8391 | Expr : constant Node_Id := Expression (Parent (Trans_Id)); | |
f7bb41af AC |
8392 | begin |
8393 | return | |
8394 | Is_Access_Type (Etype (Trans_Id)) | |
8395 | and then Present (Expr) | |
8396 | and then Nkind (Expr) = N_Allocator; | |
8397 | end Is_Allocated; | |
df3e68b1 | 8398 | |
2f7b7467 AC |
8399 | --------------------------- |
8400 | -- Is_Iterated_Container -- | |
8401 | --------------------------- | |
8402 | ||
8403 | function Is_Iterated_Container | |
8404 | (Trans_Id : Entity_Id; | |
8405 | First_Stmt : Node_Id) return Boolean | |
8406 | is | |
8407 | Aspect : Node_Id; | |
8408 | Call : Node_Id; | |
8409 | Iter : Entity_Id; | |
8410 | Param : Node_Id; | |
8411 | Stmt : Node_Id; | |
8412 | Typ : Entity_Id; | |
8413 | ||
8414 | begin | |
8415 | -- It is not possible to iterate over containers in non-Ada 2012 code | |
8416 | ||
8417 | if Ada_Version < Ada_2012 then | |
8418 | return False; | |
8419 | end if; | |
8420 | ||
8421 | Typ := Etype (Trans_Id); | |
8422 | ||
8423 | -- Handle access type created for secondary stack use | |
8424 | ||
8425 | if Is_Access_Type (Typ) then | |
8426 | Typ := Designated_Type (Typ); | |
8427 | end if; | |
8428 | ||
46de64ca AC |
8429 | -- Look for aspect Default_Iterator. It may be part of a type |
8430 | -- declaration for a container, or inherited from a base type | |
8431 | -- or parent type. | |
2f7b7467 | 8432 | |
46de64ca | 8433 | Aspect := Find_Value_Of_Aspect (Typ, Aspect_Default_Iterator); |
2f7b7467 | 8434 | |
46de64ca AC |
8435 | if Present (Aspect) then |
8436 | Iter := Entity (Aspect); | |
2f7b7467 | 8437 | |
46de64ca AC |
8438 | -- Examine the statements following the container object and |
8439 | -- look for a call to the default iterate routine where the | |
8440 | -- first parameter is the transient. Such a call appears as: | |
2f7b7467 | 8441 | |
46de64ca AC |
8442 | -- It : Access_To_CW_Iterator := |
8443 | -- Iterate (Tran_Id.all, ...)'reference; | |
2f7b7467 | 8444 | |
46de64ca AC |
8445 | Stmt := First_Stmt; |
8446 | while Present (Stmt) loop | |
2f7b7467 | 8447 | |
46de64ca AC |
8448 | -- Detect an object declaration which is initialized by a |
8449 | -- secondary stack function call. | |
2f7b7467 | 8450 | |
46de64ca AC |
8451 | if Nkind (Stmt) = N_Object_Declaration |
8452 | and then Present (Expression (Stmt)) | |
8453 | and then Nkind (Expression (Stmt)) = N_Reference | |
c5c780e6 | 8454 | and then Nkind (Prefix (Expression (Stmt))) = N_Function_Call |
46de64ca AC |
8455 | then |
8456 | Call := Prefix (Expression (Stmt)); | |
2f7b7467 | 8457 | |
46de64ca AC |
8458 | -- The call must invoke the default iterate routine of |
8459 | -- the container and the transient object must appear as | |
8460 | -- the first actual parameter. Skip any calls whose names | |
8461 | -- are not entities. | |
2f7b7467 | 8462 | |
46de64ca AC |
8463 | if Is_Entity_Name (Name (Call)) |
8464 | and then Entity (Name (Call)) = Iter | |
8465 | and then Present (Parameter_Associations (Call)) | |
8466 | then | |
8467 | Param := First (Parameter_Associations (Call)); | |
2f7b7467 | 8468 | |
46de64ca AC |
8469 | if Nkind (Param) = N_Explicit_Dereference |
8470 | and then Entity (Prefix (Param)) = Trans_Id | |
8471 | then | |
8472 | return True; | |
2f7b7467 AC |
8473 | end if; |
8474 | end if; | |
46de64ca | 8475 | end if; |
2f7b7467 | 8476 | |
46de64ca AC |
8477 | Next (Stmt); |
8478 | end loop; | |
2f7b7467 AC |
8479 | end if; |
8480 | ||
8481 | return False; | |
8482 | end Is_Iterated_Container; | |
8483 | ||
13209acd AC |
8484 | ------------------------------------- |
8485 | -- Is_Part_Of_BIP_Return_Statement -- | |
8486 | ------------------------------------- | |
8487 | ||
8488 | function Is_Part_Of_BIP_Return_Statement (N : Node_Id) return Boolean is | |
8489 | Subp : constant Entity_Id := Current_Subprogram; | |
8490 | Context : Node_Id; | |
8491 | begin | |
8492 | -- First check if N is part of a BIP function | |
8493 | ||
8494 | if No (Subp) | |
8495 | or else not Is_Build_In_Place_Function (Subp) | |
8496 | then | |
8497 | return False; | |
8498 | end if; | |
8499 | ||
8500 | -- Then check whether N is a complete part of a return statement | |
8501 | -- Should we consider other node kinds to go up the tree??? | |
8502 | ||
8503 | Context := N; | |
8504 | loop | |
8505 | case Nkind (Context) is | |
8506 | when N_Expression_With_Actions => Context := Parent (Context); | |
8507 | when N_Simple_Return_Statement => return True; | |
8508 | when others => return False; | |
8509 | end case; | |
8510 | end loop; | |
8511 | end Is_Part_Of_BIP_Return_Statement; | |
8512 | ||
4b17187f AC |
8513 | -- Local variables |
8514 | ||
8515 | Desig : Entity_Id := Obj_Typ; | |
8516 | ||
df3e68b1 HK |
8517 | -- Start of processing for Is_Finalizable_Transient |
8518 | ||
8519 | begin | |
8520 | -- Handle access types | |
8521 | ||
8522 | if Is_Access_Type (Desig) then | |
8523 | Desig := Available_View (Designated_Type (Desig)); | |
8524 | end if; | |
8525 | ||
8526 | return | |
4a08c95c | 8527 | Ekind (Obj_Id) in E_Constant | E_Variable |
df3e68b1 HK |
8528 | and then Needs_Finalization (Desig) |
8529 | and then Requires_Transient_Scope (Desig) | |
8530 | and then Nkind (Rel_Node) /= N_Simple_Return_Statement | |
13209acd | 8531 | and then not Is_Part_Of_BIP_Return_Statement (Rel_Node) |
df3e68b1 | 8532 | |
937e9676 AC |
8533 | -- Do not consider a transient object that was already processed |
8534 | ||
8535 | and then not Is_Finalized_Transient (Obj_Id) | |
8536 | ||
2c17ca0a AC |
8537 | -- Do not consider renamed or 'reference-d transient objects because |
8538 | -- the act of renaming extends the object's lifetime. | |
f7bb41af AC |
8539 | |
8540 | and then not Is_Aliased (Obj_Id, Decl) | |
8541 | ||
2c17ca0a AC |
8542 | -- Do not consider transient objects allocated on the heap since |
8543 | -- they are attached to a finalization master. | |
df3e68b1 HK |
8544 | |
8545 | and then not Is_Allocated (Obj_Id) | |
8546 | ||
2c17ca0a | 8547 | -- If the transient object is a pointer, check that it is not |
7c4d86c9 | 8548 | -- initialized by a function that returns a pointer or acts as a |
2c17ca0a | 8549 | -- renaming of another pointer. |
df3e68b1 | 8550 | |
13209acd AC |
8551 | and then not |
8552 | (Is_Access_Type (Obj_Typ) and then Initialized_By_Access (Obj_Id)) | |
df3e68b1 | 8553 | |
2c17ca0a AC |
8554 | -- Do not consider transient objects which act as indirect aliases |
8555 | -- of build-in-place function results. | |
df3e68b1 | 8556 | |
2d395256 AC |
8557 | and then not Initialized_By_Aliased_BIP_Func_Call (Obj_Id) |
8558 | ||
2c17ca0a | 8559 | -- Do not consider conversions of tags to class-wide types |
2d395256 | 8560 | |
aab08130 | 8561 | and then not Is_Tag_To_Class_Wide_Conversion (Obj_Id) |
2f7b7467 | 8562 | |
4b17187f AC |
8563 | -- Do not consider iterators because those are treated as normal |
8564 | -- controlled objects and are processed by the usual finalization | |
8565 | -- machinery. This avoids the double finalization of an iterator. | |
8566 | ||
8567 | and then not Is_Iterator (Desig) | |
8568 | ||
2f7b7467 AC |
8569 | -- Do not consider containers in the context of iterator loops. Such |
8570 | -- transient objects must exist for as long as the loop is around, | |
8571 | -- otherwise any operation carried out by the iterator will fail. | |
8572 | ||
8573 | and then not Is_Iterated_Container (Obj_Id, Decl); | |
df3e68b1 HK |
8574 | end Is_Finalizable_Transient; |
8575 | ||
6fb4cdde AC |
8576 | --------------------------------- |
8577 | -- Is_Fully_Repped_Tagged_Type -- | |
8578 | --------------------------------- | |
8579 | ||
8580 | function Is_Fully_Repped_Tagged_Type (T : Entity_Id) return Boolean is | |
8581 | U : constant Entity_Id := Underlying_Type (T); | |
8582 | Comp : Entity_Id; | |
8583 | ||
8584 | begin | |
8585 | if No (U) or else not Is_Tagged_Type (U) then | |
8586 | return False; | |
8587 | elsif Has_Discriminants (U) then | |
8588 | return False; | |
8589 | elsif not Has_Specified_Layout (U) then | |
8590 | return False; | |
8591 | end if; | |
8592 | ||
1f159b86 BD |
8593 | -- Here we have a tagged type, see if it has any component (other than |
8594 | -- tag and parent) with no component_clause. If so, we return False. | |
6fb4cdde AC |
8595 | |
8596 | Comp := First_Component (U); | |
8597 | while Present (Comp) loop | |
8598 | if not Is_Tag (Comp) | |
8599 | and then Chars (Comp) /= Name_uParent | |
8600 | and then No (Component_Clause (Comp)) | |
8601 | then | |
8602 | return False; | |
8603 | else | |
8604 | Next_Component (Comp); | |
8605 | end if; | |
8606 | end loop; | |
8607 | ||
1f159b86 | 8608 | -- All components have clauses |
6fb4cdde AC |
8609 | |
8610 | return True; | |
8611 | end Is_Fully_Repped_Tagged_Type; | |
8612 | ||
86cde7b1 RD |
8613 | ---------------------------------- |
8614 | -- Is_Library_Level_Tagged_Type -- | |
8615 | ---------------------------------- | |
8616 | ||
8617 | function Is_Library_Level_Tagged_Type (Typ : Entity_Id) return Boolean is | |
8618 | begin | |
0e564ab4 | 8619 | return Is_Tagged_Type (Typ) and then Is_Library_Level_Entity (Typ); |
86cde7b1 RD |
8620 | end Is_Library_Level_Tagged_Type; |
8621 | ||
df3e68b1 HK |
8622 | -------------------------- |
8623 | -- Is_Non_BIP_Func_Call -- | |
8624 | -------------------------- | |
8625 | ||
8626 | function Is_Non_BIP_Func_Call (Expr : Node_Id) return Boolean is | |
8627 | begin | |
8628 | -- The expected call is of the format | |
8629 | -- | |
8630 | -- Func_Call'reference | |
8631 | ||
8632 | return | |
8633 | Nkind (Expr) = N_Reference | |
8634 | and then Nkind (Prefix (Expr)) = N_Function_Call | |
8635 | and then not Is_Build_In_Place_Function_Call (Prefix (Expr)); | |
8636 | end Is_Non_BIP_Func_Call; | |
8637 | ||
fbf5a39b AC |
8638 | ---------------------------------- |
8639 | -- Is_Possibly_Unaligned_Object -- | |
8640 | ---------------------------------- | |
8641 | ||
f44fe430 RD |
8642 | function Is_Possibly_Unaligned_Object (N : Node_Id) return Boolean is |
8643 | T : constant Entity_Id := Etype (N); | |
8644 | ||
fbf5a39b | 8645 | begin |
f44fe430 | 8646 | -- If renamed object, apply test to underlying object |
fbf5a39b | 8647 | |
f44fe430 RD |
8648 | if Is_Entity_Name (N) |
8649 | and then Is_Object (Entity (N)) | |
8650 | and then Present (Renamed_Object (Entity (N))) | |
8651 | then | |
8652 | return Is_Possibly_Unaligned_Object (Renamed_Object (Entity (N))); | |
fbf5a39b AC |
8653 | end if; |
8654 | ||
273adcdf AC |
8655 | -- Tagged and controlled types and aliased types are always aligned, as |
8656 | -- are concurrent types. | |
fbf5a39b | 8657 | |
f44fe430 RD |
8658 | if Is_Aliased (T) |
8659 | or else Has_Controlled_Component (T) | |
8660 | or else Is_Concurrent_Type (T) | |
8661 | or else Is_Tagged_Type (T) | |
8662 | or else Is_Controlled (T) | |
fbf5a39b | 8663 | then |
f44fe430 | 8664 | return False; |
fbf5a39b AC |
8665 | end if; |
8666 | ||
8667 | -- If this is an element of a packed array, may be unaligned | |
8668 | ||
f44fe430 | 8669 | if Is_Ref_To_Bit_Packed_Array (N) then |
fbf5a39b AC |
8670 | return True; |
8671 | end if; | |
8672 | ||
1adaea16 | 8673 | -- Case of indexed component reference: test whether prefix is unaligned |
fbf5a39b | 8674 | |
1adaea16 AC |
8675 | if Nkind (N) = N_Indexed_Component then |
8676 | return Is_Possibly_Unaligned_Object (Prefix (N)); | |
8677 | ||
8678 | -- Case of selected component reference | |
8679 | ||
8680 | elsif Nkind (N) = N_Selected_Component then | |
f44fe430 RD |
8681 | declare |
8682 | P : constant Node_Id := Prefix (N); | |
8683 | C : constant Entity_Id := Entity (Selector_Name (N)); | |
8684 | M : Nat; | |
8685 | S : Nat; | |
fbf5a39b | 8686 | |
f44fe430 | 8687 | begin |
3f833dc2 | 8688 | -- If component reference is for an array with nonstatic bounds, |
273adcdf | 8689 | -- then it is always aligned: we can only process unaligned arrays |
2c17ca0a | 8690 | -- with static bounds (more precisely compile time known bounds). |
fbf5a39b | 8691 | |
f44fe430 RD |
8692 | if Is_Array_Type (T) |
8693 | and then not Compile_Time_Known_Bounds (T) | |
8694 | then | |
8695 | return False; | |
8696 | end if; | |
fbf5a39b | 8697 | |
f44fe430 | 8698 | -- If component is aliased, it is definitely properly aligned |
fbf5a39b | 8699 | |
f44fe430 RD |
8700 | if Is_Aliased (C) then |
8701 | return False; | |
8702 | end if; | |
8703 | ||
8704 | -- If component is for a type implemented as a scalar, and the | |
8705 | -- record is packed, and the component is other than the first | |
8706 | -- component of the record, then the component may be unaligned. | |
8707 | ||
8708 | if Is_Packed (Etype (P)) | |
8adcacef RD |
8709 | and then Represented_As_Scalar (Etype (C)) |
8710 | and then First_Entity (Scope (C)) /= C | |
f44fe430 RD |
8711 | then |
8712 | return True; | |
8713 | end if; | |
8714 | ||
8715 | -- Compute maximum possible alignment for T | |
8716 | ||
8717 | -- If alignment is known, then that settles things | |
8718 | ||
8719 | if Known_Alignment (T) then | |
8720 | M := UI_To_Int (Alignment (T)); | |
8721 | ||
8722 | -- If alignment is not known, tentatively set max alignment | |
8723 | ||
8724 | else | |
8725 | M := Ttypes.Maximum_Alignment; | |
8726 | ||
8727 | -- We can reduce this if the Esize is known since the default | |
8728 | -- alignment will never be more than the smallest power of 2 | |
8729 | -- that does not exceed this Esize value. | |
8730 | ||
8731 | if Known_Esize (T) then | |
8732 | S := UI_To_Int (Esize (T)); | |
8733 | ||
8734 | while (M / 2) >= S loop | |
8735 | M := M / 2; | |
8736 | end loop; | |
8737 | end if; | |
8738 | end if; | |
8739 | ||
f44fe430 RD |
8740 | -- Case of component clause present which may specify an |
8741 | -- unaligned position. | |
8742 | ||
8743 | if Present (Component_Clause (C)) then | |
8744 | ||
8745 | -- Otherwise we can do a test to make sure that the actual | |
8746 | -- start position in the record, and the length, are both | |
8747 | -- consistent with the required alignment. If not, we know | |
8748 | -- that we are unaligned. | |
8749 | ||
8750 | declare | |
8751 | Align_In_Bits : constant Nat := M * System_Storage_Unit; | |
92a68a04 HK |
8752 | Comp : Entity_Id; |
8753 | ||
f44fe430 | 8754 | begin |
92a68a04 HK |
8755 | Comp := C; |
8756 | ||
294e7bbb EB |
8757 | -- For a component inherited in a record extension, the |
8758 | -- clause is inherited but position and size are not set. | |
8759 | ||
8760 | if Is_Base_Type (Etype (P)) | |
8761 | and then Is_Tagged_Type (Etype (P)) | |
92a68a04 | 8762 | and then Present (Original_Record_Component (Comp)) |
294e7bbb | 8763 | then |
92a68a04 | 8764 | Comp := Original_Record_Component (Comp); |
294e7bbb EB |
8765 | end if; |
8766 | ||
92a68a04 HK |
8767 | if Component_Bit_Offset (Comp) mod Align_In_Bits /= 0 |
8768 | or else Esize (Comp) mod Align_In_Bits /= 0 | |
f44fe430 RD |
8769 | then |
8770 | return True; | |
8771 | end if; | |
8772 | end; | |
8773 | end if; | |
8774 | ||
8775 | -- Otherwise, for a component reference, test prefix | |
8776 | ||
8777 | return Is_Possibly_Unaligned_Object (P); | |
8778 | end; | |
fbf5a39b AC |
8779 | |
8780 | -- If not a component reference, must be aligned | |
8781 | ||
8782 | else | |
8783 | return False; | |
8784 | end if; | |
8785 | end Is_Possibly_Unaligned_Object; | |
8786 | ||
8787 | --------------------------------- | |
8788 | -- Is_Possibly_Unaligned_Slice -- | |
8789 | --------------------------------- | |
8790 | ||
f44fe430 | 8791 | function Is_Possibly_Unaligned_Slice (N : Node_Id) return Boolean is |
fbf5a39b | 8792 | begin |
0712790c | 8793 | -- Go to renamed object |
246d2ceb | 8794 | |
f44fe430 RD |
8795 | if Is_Entity_Name (N) |
8796 | and then Is_Object (Entity (N)) | |
8797 | and then Present (Renamed_Object (Entity (N))) | |
fbf5a39b | 8798 | then |
f44fe430 | 8799 | return Is_Possibly_Unaligned_Slice (Renamed_Object (Entity (N))); |
fbf5a39b AC |
8800 | end if; |
8801 | ||
246d2ceb | 8802 | -- The reference must be a slice |
fbf5a39b | 8803 | |
f44fe430 | 8804 | if Nkind (N) /= N_Slice then |
246d2ceb | 8805 | return False; |
fbf5a39b AC |
8806 | end if; |
8807 | ||
fbf5a39b AC |
8808 | -- If it is a slice, then look at the array type being sliced |
8809 | ||
8810 | declare | |
f44fe430 | 8811 | Sarr : constant Node_Id := Prefix (N); |
246d2ceb AC |
8812 | -- Prefix of the slice, i.e. the array being sliced |
8813 | ||
f44fe430 | 8814 | Styp : constant Entity_Id := Etype (Prefix (N)); |
246d2ceb AC |
8815 | -- Type of the array being sliced |
8816 | ||
8817 | Pref : Node_Id; | |
8818 | Ptyp : Entity_Id; | |
fbf5a39b AC |
8819 | |
8820 | begin | |
246d2ceb AC |
8821 | -- The problems arise if the array object that is being sliced |
8822 | -- is a component of a record or array, and we cannot guarantee | |
8823 | -- the alignment of the array within its containing object. | |
fbf5a39b | 8824 | |
246d2ceb AC |
8825 | -- To investigate this, we look at successive prefixes to see |
8826 | -- if we have a worrisome indexed or selected component. | |
fbf5a39b | 8827 | |
246d2ceb AC |
8828 | Pref := Sarr; |
8829 | loop | |
8830 | -- Case of array is part of an indexed component reference | |
fbf5a39b | 8831 | |
246d2ceb AC |
8832 | if Nkind (Pref) = N_Indexed_Component then |
8833 | Ptyp := Etype (Prefix (Pref)); | |
8834 | ||
273adcdf AC |
8835 | -- The only problematic case is when the array is packed, in |
8836 | -- which case we really know nothing about the alignment of | |
8837 | -- individual components. | |
246d2ceb AC |
8838 | |
8839 | if Is_Bit_Packed_Array (Ptyp) then | |
8840 | return True; | |
8841 | end if; | |
8842 | ||
8843 | -- Case of array is part of a selected component reference | |
8844 | ||
8845 | elsif Nkind (Pref) = N_Selected_Component then | |
8846 | Ptyp := Etype (Prefix (Pref)); | |
8847 | ||
8848 | -- We are definitely in trouble if the record in question | |
8849 | -- has an alignment, and either we know this alignment is | |
273adcdf | 8850 | -- inconsistent with the alignment of the slice, or we don't |
c3a75a09 EB |
8851 | -- know what the alignment of the slice should be. But this |
8852 | -- really matters only if the target has strict alignment. | |
246d2ceb | 8853 | |
c3a75a09 EB |
8854 | if Target_Strict_Alignment |
8855 | and then Known_Alignment (Ptyp) | |
246d2ceb | 8856 | and then (Unknown_Alignment (Styp) |
0e564ab4 | 8857 | or else Alignment (Styp) > Alignment (Ptyp)) |
246d2ceb AC |
8858 | then |
8859 | return True; | |
8860 | end if; | |
8861 | ||
8862 | -- We are in potential trouble if the record type is packed. | |
8863 | -- We could special case when we know that the array is the | |
8864 | -- first component, but that's not such a simple case ??? | |
8865 | ||
8866 | if Is_Packed (Ptyp) then | |
8867 | return True; | |
8868 | end if; | |
8869 | ||
8870 | -- We are in trouble if there is a component clause, and | |
8871 | -- either we do not know the alignment of the slice, or | |
8872 | -- the alignment of the slice is inconsistent with the | |
8873 | -- bit position specified by the component clause. | |
8874 | ||
8875 | declare | |
8876 | Field : constant Entity_Id := Entity (Selector_Name (Pref)); | |
8877 | begin | |
8878 | if Present (Component_Clause (Field)) | |
8879 | and then | |
8880 | (Unknown_Alignment (Styp) | |
8881 | or else | |
8882 | (Component_Bit_Offset (Field) mod | |
8883 | (System_Storage_Unit * Alignment (Styp))) /= 0) | |
8884 | then | |
8885 | return True; | |
8886 | end if; | |
8887 | end; | |
8888 | ||
273adcdf AC |
8889 | -- For cases other than selected or indexed components we know we |
8890 | -- are OK, since no issues arise over alignment. | |
246d2ceb AC |
8891 | |
8892 | else | |
8893 | return False; | |
8894 | end if; | |
8895 | ||
8896 | -- We processed an indexed component or selected component | |
8897 | -- reference that looked safe, so keep checking prefixes. | |
8898 | ||
8899 | Pref := Prefix (Pref); | |
8900 | end loop; | |
fbf5a39b AC |
8901 | end; |
8902 | end Is_Possibly_Unaligned_Slice; | |
8903 | ||
df3e68b1 HK |
8904 | ------------------------------- |
8905 | -- Is_Related_To_Func_Return -- | |
8906 | ------------------------------- | |
8907 | ||
8908 | function Is_Related_To_Func_Return (Id : Entity_Id) return Boolean is | |
8909 | Expr : constant Node_Id := Related_Expression (Id); | |
df3e68b1 | 8910 | begin |
56bedb14 SB |
8911 | -- In the case of a function with a class-wide result that returns |
8912 | -- a call to a function with a specific result, we introduce a | |
8913 | -- type conversion for the return expression. We do not want that | |
8914 | -- type conversion to influence the result of this function. | |
8915 | ||
df3e68b1 HK |
8916 | return |
8917 | Present (Expr) | |
56bedb14 | 8918 | and then Nkind (Unqual_Conv (Expr)) = N_Explicit_Dereference |
df3e68b1 HK |
8919 | and then Nkind (Parent (Expr)) = N_Simple_Return_Statement; |
8920 | end Is_Related_To_Func_Return; | |
8921 | ||
70482933 RK |
8922 | -------------------------------- |
8923 | -- Is_Ref_To_Bit_Packed_Array -- | |
8924 | -------------------------------- | |
8925 | ||
f44fe430 | 8926 | function Is_Ref_To_Bit_Packed_Array (N : Node_Id) return Boolean is |
70482933 RK |
8927 | Result : Boolean; |
8928 | Expr : Node_Id; | |
8929 | ||
8930 | begin | |
f44fe430 RD |
8931 | if Is_Entity_Name (N) |
8932 | and then Is_Object (Entity (N)) | |
8933 | and then Present (Renamed_Object (Entity (N))) | |
fbf5a39b | 8934 | then |
f44fe430 | 8935 | return Is_Ref_To_Bit_Packed_Array (Renamed_Object (Entity (N))); |
fbf5a39b AC |
8936 | end if; |
8937 | ||
4a08c95c | 8938 | if Nkind (N) in N_Indexed_Component | N_Selected_Component then |
f44fe430 | 8939 | if Is_Bit_Packed_Array (Etype (Prefix (N))) then |
70482933 RK |
8940 | Result := True; |
8941 | else | |
f44fe430 | 8942 | Result := Is_Ref_To_Bit_Packed_Array (Prefix (N)); |
70482933 RK |
8943 | end if; |
8944 | ||
f44fe430 RD |
8945 | if Result and then Nkind (N) = N_Indexed_Component then |
8946 | Expr := First (Expressions (N)); | |
70482933 RK |
8947 | while Present (Expr) loop |
8948 | Force_Evaluation (Expr); | |
8949 | Next (Expr); | |
8950 | end loop; | |
8951 | end if; | |
8952 | ||
8953 | return Result; | |
8954 | ||
8955 | else | |
8956 | return False; | |
8957 | end if; | |
8958 | end Is_Ref_To_Bit_Packed_Array; | |
8959 | ||
8960 | -------------------------------- | |
fbf5a39b | 8961 | -- Is_Ref_To_Bit_Packed_Slice -- |
70482933 RK |
8962 | -------------------------------- |
8963 | ||
f44fe430 | 8964 | function Is_Ref_To_Bit_Packed_Slice (N : Node_Id) return Boolean is |
70482933 | 8965 | begin |
ea985d95 RD |
8966 | if Nkind (N) = N_Type_Conversion then |
8967 | return Is_Ref_To_Bit_Packed_Slice (Expression (N)); | |
8968 | ||
8969 | elsif Is_Entity_Name (N) | |
f44fe430 RD |
8970 | and then Is_Object (Entity (N)) |
8971 | and then Present (Renamed_Object (Entity (N))) | |
fbf5a39b | 8972 | then |
f44fe430 | 8973 | return Is_Ref_To_Bit_Packed_Slice (Renamed_Object (Entity (N))); |
fbf5a39b | 8974 | |
ea985d95 | 8975 | elsif Nkind (N) = N_Slice |
f44fe430 | 8976 | and then Is_Bit_Packed_Array (Etype (Prefix (N))) |
70482933 RK |
8977 | then |
8978 | return True; | |
8979 | ||
4a08c95c | 8980 | elsif Nkind (N) in N_Indexed_Component | N_Selected_Component then |
f44fe430 | 8981 | return Is_Ref_To_Bit_Packed_Slice (Prefix (N)); |
70482933 RK |
8982 | |
8983 | else | |
8984 | return False; | |
8985 | end if; | |
8986 | end Is_Ref_To_Bit_Packed_Slice; | |
8987 | ||
8988 | ----------------------- | |
8989 | -- Is_Renamed_Object -- | |
8990 | ----------------------- | |
8991 | ||
8992 | function Is_Renamed_Object (N : Node_Id) return Boolean is | |
8993 | Pnod : constant Node_Id := Parent (N); | |
8994 | Kind : constant Node_Kind := Nkind (Pnod); | |
70482933 RK |
8995 | begin |
8996 | if Kind = N_Object_Renaming_Declaration then | |
8997 | return True; | |
4a08c95c | 8998 | elsif Kind in N_Indexed_Component | N_Selected_Component then |
70482933 | 8999 | return Is_Renamed_Object (Pnod); |
70482933 RK |
9000 | else |
9001 | return False; | |
9002 | end if; | |
9003 | end Is_Renamed_Object; | |
9004 | ||
cdc96e3e AC |
9005 | -------------------------------------- |
9006 | -- Is_Secondary_Stack_BIP_Func_Call -- | |
9007 | -------------------------------------- | |
9008 | ||
9009 | function Is_Secondary_Stack_BIP_Func_Call (Expr : Node_Id) return Boolean is | |
7b966a95 AC |
9010 | Actual : Node_Id; |
9011 | Call : Node_Id := Expr; | |
9012 | Formal : Node_Id; | |
9013 | Param : Node_Id; | |
cdc96e3e AC |
9014 | |
9015 | begin | |
e0adfeb4 AC |
9016 | -- Build-in-place calls usually appear in 'reference format. Note that |
9017 | -- the accessibility check machinery may add an extra 'reference due to | |
9018 | -- side effect removal. | |
cdc96e3e | 9019 | |
e0adfeb4 | 9020 | while Nkind (Call) = N_Reference loop |
cdc96e3e | 9021 | Call := Prefix (Call); |
e0adfeb4 | 9022 | end loop; |
cdc96e3e | 9023 | |
0691ed6b | 9024 | Call := Unqual_Conv (Call); |
cdc96e3e AC |
9025 | |
9026 | if Is_Build_In_Place_Function_Call (Call) then | |
cdc96e3e | 9027 | |
7b966a95 | 9028 | -- Examine all parameter associations of the function call |
cdc96e3e | 9029 | |
7b966a95 AC |
9030 | Param := First (Parameter_Associations (Call)); |
9031 | while Present (Param) loop | |
d4dfb005 | 9032 | if Nkind (Param) = N_Parameter_Association then |
7b966a95 AC |
9033 | Formal := Selector_Name (Param); |
9034 | Actual := Explicit_Actual_Parameter (Param); | |
9035 | ||
7b966a95 | 9036 | -- A match for BIPalloc => 2 has been found |
cdc96e3e | 9037 | |
b93d80bc JM |
9038 | if Is_Build_In_Place_Entity (Formal) |
9039 | and then BIP_Suffix_Kind (Formal) = BIP_Alloc_Form | |
7b966a95 AC |
9040 | and then Nkind (Actual) = N_Integer_Literal |
9041 | and then Intval (Actual) = Uint_2 | |
9042 | then | |
9043 | return True; | |
cdc96e3e | 9044 | end if; |
7b966a95 | 9045 | end if; |
cdc96e3e | 9046 | |
7b966a95 AC |
9047 | Next (Param); |
9048 | end loop; | |
cdc96e3e AC |
9049 | end if; |
9050 | ||
9051 | return False; | |
9052 | end Is_Secondary_Stack_BIP_Func_Call; | |
9053 | ||
aab08130 AC |
9054 | ------------------------------------- |
9055 | -- Is_Tag_To_Class_Wide_Conversion -- | |
9056 | ------------------------------------- | |
2d395256 | 9057 | |
aab08130 AC |
9058 | function Is_Tag_To_Class_Wide_Conversion |
9059 | (Obj_Id : Entity_Id) return Boolean | |
9060 | is | |
2d395256 AC |
9061 | Expr : constant Node_Id := Expression (Parent (Obj_Id)); |
9062 | ||
9063 | begin | |
9064 | return | |
9065 | Is_Class_Wide_Type (Etype (Obj_Id)) | |
9066 | and then Present (Expr) | |
9067 | and then Nkind (Expr) = N_Unchecked_Type_Conversion | |
3477e0b2 | 9068 | and then Is_RTE (Etype (Expression (Expr)), RE_Tag); |
aab08130 | 9069 | end Is_Tag_To_Class_Wide_Conversion; |
2d395256 | 9070 | |
a46fa651 ES |
9071 | -------------------------------- |
9072 | -- Is_Uninitialized_Aggregate -- | |
9073 | -------------------------------- | |
9074 | ||
9075 | function Is_Uninitialized_Aggregate | |
9076 | (Exp : Node_Id; | |
9077 | T : Entity_Id) return Boolean | |
9078 | is | |
9079 | Comp : Node_Id; | |
9080 | Comp_Type : Entity_Id; | |
9081 | Typ : Entity_Id; | |
9082 | ||
9083 | begin | |
9084 | if Nkind (Exp) /= N_Aggregate then | |
9085 | return False; | |
9086 | end if; | |
9087 | ||
9088 | Preanalyze_And_Resolve (Exp, T); | |
9089 | Typ := Etype (Exp); | |
9090 | ||
9091 | if No (Typ) | |
9092 | or else Ekind (Typ) /= E_Array_Subtype | |
9093 | or else Present (Expressions (Exp)) | |
9094 | or else No (Component_Associations (Exp)) | |
9095 | then | |
9096 | return False; | |
9097 | else | |
9098 | Comp_Type := Component_Type (Typ); | |
9099 | Comp := First (Component_Associations (Exp)); | |
9100 | ||
9101 | if not Box_Present (Comp) | |
9102 | or else Present (Next (Comp)) | |
9103 | then | |
9104 | return False; | |
9105 | end if; | |
9106 | ||
9107 | return Is_Scalar_Type (Comp_Type) | |
9108 | and then No (Default_Aspect_Component_Value (Typ)); | |
9109 | end if; | |
9110 | end Is_Uninitialized_Aggregate; | |
9111 | ||
70482933 RK |
9112 | ---------------------------- |
9113 | -- Is_Untagged_Derivation -- | |
9114 | ---------------------------- | |
9115 | ||
9116 | function Is_Untagged_Derivation (T : Entity_Id) return Boolean is | |
9117 | begin | |
9118 | return (not Is_Tagged_Type (T) and then Is_Derived_Type (T)) | |
9119 | or else | |
7b966a95 AC |
9120 | (Is_Private_Type (T) and then Present (Full_View (T)) |
9121 | and then not Is_Tagged_Type (Full_View (T)) | |
9122 | and then Is_Derived_Type (Full_View (T)) | |
9123 | and then Etype (Full_View (T)) /= T); | |
70482933 RK |
9124 | end Is_Untagged_Derivation; |
9125 | ||
51148dda AC |
9126 | ------------------------------------ |
9127 | -- Is_Untagged_Private_Derivation -- | |
9128 | ------------------------------------ | |
9129 | ||
9130 | function Is_Untagged_Private_Derivation | |
9131 | (Priv_Typ : Entity_Id; | |
9132 | Full_Typ : Entity_Id) return Boolean | |
9133 | is | |
9134 | begin | |
9135 | return | |
9136 | Present (Priv_Typ) | |
9137 | and then Is_Untagged_Derivation (Priv_Typ) | |
9138 | and then Is_Private_Type (Etype (Priv_Typ)) | |
9139 | and then Present (Full_Typ) | |
9140 | and then Is_Itype (Full_Typ); | |
9141 | end Is_Untagged_Private_Derivation; | |
9142 | ||
b3801819 PMR |
9143 | ------------------------------ |
9144 | -- Is_Verifiable_DIC_Pragma -- | |
9145 | ------------------------------ | |
9146 | ||
9147 | function Is_Verifiable_DIC_Pragma (Prag : Node_Id) return Boolean is | |
9148 | Args : constant List_Id := Pragma_Argument_Associations (Prag); | |
9149 | ||
9150 | begin | |
9151 | -- To qualify as verifiable, a DIC pragma must have a non-null argument | |
9152 | ||
9153 | return | |
9154 | Present (Args) | |
f7937111 GD |
9155 | |
9156 | -- If there are args, but the first arg is Empty, then treat the | |
9157 | -- pragma the same as having no args (there may be a second arg that | |
9158 | -- is an implicitly added type arg, and Empty is a placeholder). | |
9159 | ||
9160 | and then Present (Get_Pragma_Arg (First (Args))) | |
9161 | ||
b3801819 PMR |
9162 | and then Nkind (Get_Pragma_Arg (First (Args))) /= N_Null; |
9163 | end Is_Verifiable_DIC_Pragma; | |
9164 | ||
65df5b71 HK |
9165 | --------------------------- |
9166 | -- Is_Volatile_Reference -- | |
9167 | --------------------------- | |
9168 | ||
9169 | function Is_Volatile_Reference (N : Node_Id) return Boolean is | |
9170 | begin | |
bb012790 AC |
9171 | -- Only source references are to be treated as volatile, internally |
9172 | -- generated stuff cannot have volatile external effects. | |
9173 | ||
9174 | if not Comes_From_Source (N) then | |
9175 | return False; | |
9176 | ||
9177 | -- Never true for reference to a type | |
9178 | ||
9179 | elsif Is_Entity_Name (N) and then Is_Type (Entity (N)) then | |
9180 | return False; | |
9181 | ||
57d08392 AC |
9182 | -- Never true for a compile time known constant |
9183 | ||
9184 | elsif Compile_Time_Known_Value (N) then | |
9185 | return False; | |
9186 | ||
bb012790 AC |
9187 | -- True if object reference with volatile type |
9188 | ||
76f9c7f4 | 9189 | elsif Is_Volatile_Object_Ref (N) then |
65df5b71 HK |
9190 | return True; |
9191 | ||
bb012790 AC |
9192 | -- True if reference to volatile entity |
9193 | ||
65df5b71 HK |
9194 | elsif Is_Entity_Name (N) then |
9195 | return Treat_As_Volatile (Entity (N)); | |
9196 | ||
bb012790 AC |
9197 | -- True for slice of volatile array |
9198 | ||
65df5b71 HK |
9199 | elsif Nkind (N) = N_Slice then |
9200 | return Is_Volatile_Reference (Prefix (N)); | |
9201 | ||
bb012790 AC |
9202 | -- True if volatile component |
9203 | ||
4a08c95c | 9204 | elsif Nkind (N) in N_Indexed_Component | N_Selected_Component then |
65df5b71 | 9205 | if (Is_Entity_Name (Prefix (N)) |
0e564ab4 | 9206 | and then Has_Volatile_Components (Entity (Prefix (N)))) |
65df5b71 | 9207 | or else (Present (Etype (Prefix (N))) |
0e564ab4 | 9208 | and then Has_Volatile_Components (Etype (Prefix (N)))) |
65df5b71 HK |
9209 | then |
9210 | return True; | |
9211 | else | |
9212 | return Is_Volatile_Reference (Prefix (N)); | |
9213 | end if; | |
9214 | ||
bb012790 AC |
9215 | -- Otherwise false |
9216 | ||
65df5b71 HK |
9217 | else |
9218 | return False; | |
9219 | end if; | |
9220 | end Is_Volatile_Reference; | |
9221 | ||
70482933 RK |
9222 | -------------------- |
9223 | -- Kill_Dead_Code -- | |
9224 | -------------------- | |
9225 | ||
05350ac6 | 9226 | procedure Kill_Dead_Code (N : Node_Id; Warn : Boolean := False) is |
3acdda2d AC |
9227 | W : Boolean := Warn; |
9228 | -- Set False if warnings suppressed | |
9229 | ||
70482933 RK |
9230 | begin |
9231 | if Present (N) then | |
70482933 RK |
9232 | Remove_Warning_Messages (N); |
9233 | ||
90e491a7 PMR |
9234 | -- Update the internal structures of the ABE mechanism in case the |
9235 | -- dead node is an elaboration scenario. | |
9236 | ||
9237 | Kill_Elaboration_Scenario (N); | |
9238 | ||
3acdda2d AC |
9239 | -- Generate warning if appropriate |
9240 | ||
9241 | if W then | |
9242 | ||
9243 | -- We suppress the warning if this code is under control of an | |
9244 | -- if statement, whose condition is a simple identifier, and | |
9245 | -- either we are in an instance, or warnings off is set for this | |
9246 | -- identifier. The reason for killing it in the instance case is | |
9247 | -- that it is common and reasonable for code to be deleted in | |
9248 | -- instances for various reasons. | |
9249 | ||
02bb0765 AC |
9250 | -- Could we use Is_Statically_Unevaluated here??? |
9251 | ||
3acdda2d AC |
9252 | if Nkind (Parent (N)) = N_If_Statement then |
9253 | declare | |
9254 | C : constant Node_Id := Condition (Parent (N)); | |
9255 | begin | |
9256 | if Nkind (C) = N_Identifier | |
9257 | and then | |
9258 | (In_Instance | |
9259 | or else (Present (Entity (C)) | |
0e564ab4 | 9260 | and then Has_Warnings_Off (Entity (C)))) |
3acdda2d AC |
9261 | then |
9262 | W := False; | |
9263 | end if; | |
9264 | end; | |
9265 | end if; | |
9266 | ||
9267 | -- Generate warning if not suppressed | |
9268 | ||
9269 | if W then | |
ed2233dc | 9270 | Error_Msg_F |
685bc70f | 9271 | ("?t?this code can never be executed and has been deleted!", |
324ac540 | 9272 | N); |
3acdda2d | 9273 | end if; |
05350ac6 BD |
9274 | end if; |
9275 | ||
07fc65c4 | 9276 | -- Recurse into block statements and bodies to process declarations |
3acdda2d | 9277 | -- and statements. |
70482933 | 9278 | |
07fc65c4 GB |
9279 | if Nkind (N) = N_Block_Statement |
9280 | or else Nkind (N) = N_Subprogram_Body | |
9281 | or else Nkind (N) = N_Package_Body | |
9282 | then | |
569f538b TQ |
9283 | Kill_Dead_Code (Declarations (N), False); |
9284 | Kill_Dead_Code (Statements (Handled_Statement_Sequence (N))); | |
70482933 | 9285 | |
07fc65c4 GB |
9286 | if Nkind (N) = N_Subprogram_Body then |
9287 | Set_Is_Eliminated (Defining_Entity (N)); | |
9288 | end if; | |
9289 | ||
f44fe430 RD |
9290 | elsif Nkind (N) = N_Package_Declaration then |
9291 | Kill_Dead_Code (Visible_Declarations (Specification (N))); | |
9292 | Kill_Dead_Code (Private_Declarations (Specification (N))); | |
9293 | ||
569f538b | 9294 | -- ??? After this point, Delete_Tree has been called on all |
273adcdf AC |
9295 | -- declarations in Specification (N), so references to entities |
9296 | -- therein look suspicious. | |
569f538b | 9297 | |
f44fe430 RD |
9298 | declare |
9299 | E : Entity_Id := First_Entity (Defining_Entity (N)); | |
02bb0765 | 9300 | |
f44fe430 RD |
9301 | begin |
9302 | while Present (E) loop | |
9303 | if Ekind (E) = E_Operator then | |
9304 | Set_Is_Eliminated (E); | |
9305 | end if; | |
9306 | ||
9307 | Next_Entity (E); | |
9308 | end loop; | |
9309 | end; | |
9310 | ||
273adcdf AC |
9311 | -- Recurse into composite statement to kill individual statements in |
9312 | -- particular instantiations. | |
70482933 RK |
9313 | |
9314 | elsif Nkind (N) = N_If_Statement then | |
9315 | Kill_Dead_Code (Then_Statements (N)); | |
02bb0765 | 9316 | Kill_Dead_Code (Elsif_Parts (N)); |
70482933 RK |
9317 | Kill_Dead_Code (Else_Statements (N)); |
9318 | ||
9319 | elsif Nkind (N) = N_Loop_Statement then | |
9320 | Kill_Dead_Code (Statements (N)); | |
9321 | ||
9322 | elsif Nkind (N) = N_Case_Statement then | |
9323 | declare | |
bebbff91 | 9324 | Alt : Node_Id; |
70482933 | 9325 | begin |
bebbff91 | 9326 | Alt := First (Alternatives (N)); |
70482933 RK |
9327 | while Present (Alt) loop |
9328 | Kill_Dead_Code (Statements (Alt)); | |
9329 | Next (Alt); | |
9330 | end loop; | |
9331 | end; | |
9332 | ||
fbf5a39b AC |
9333 | elsif Nkind (N) = N_Case_Statement_Alternative then |
9334 | Kill_Dead_Code (Statements (N)); | |
9335 | ||
70482933 RK |
9336 | -- Deal with dead instances caused by deleting instantiations |
9337 | ||
9338 | elsif Nkind (N) in N_Generic_Instantiation then | |
9339 | Remove_Dead_Instance (N); | |
9340 | end if; | |
70482933 RK |
9341 | end if; |
9342 | end Kill_Dead_Code; | |
9343 | ||
9344 | -- Case where argument is a list of nodes to be killed | |
9345 | ||
05350ac6 | 9346 | procedure Kill_Dead_Code (L : List_Id; Warn : Boolean := False) is |
70482933 | 9347 | N : Node_Id; |
05350ac6 | 9348 | W : Boolean; |
02bb0765 | 9349 | |
70482933 | 9350 | begin |
05350ac6 | 9351 | W := Warn; |
02bb0765 | 9352 | |
70482933 | 9353 | if Is_Non_Empty_List (L) then |
ac4d6407 RD |
9354 | N := First (L); |
9355 | while Present (N) loop | |
05350ac6 BD |
9356 | Kill_Dead_Code (N, W); |
9357 | W := False; | |
ac4d6407 | 9358 | Next (N); |
70482933 RK |
9359 | end loop; |
9360 | end if; | |
9361 | end Kill_Dead_Code; | |
9362 | ||
70482933 RK |
9363 | ----------------------------- |
9364 | -- Make_CW_Equivalent_Type -- | |
9365 | ----------------------------- | |
9366 | ||
6fb4cdde AC |
9367 | -- Create a record type used as an equivalent of any member of the class |
9368 | -- which takes its size from exp. | |
70482933 RK |
9369 | |
9370 | -- Generate the following code: | |
9371 | ||
9372 | -- type Equiv_T is record | |
52ba224d | 9373 | -- _parent : T (List of discriminant constraints taken from Exp); |
fbf5a39b | 9374 | -- Ext__50 : Storage_Array (1 .. (Exp'size - Typ'object_size)/8); |
70482933 | 9375 | -- end Equiv_T; |
fbf5a39b | 9376 | -- |
52ba224d TQ |
9377 | -- ??? Note that this type does not guarantee same alignment as all |
9378 | -- derived types | |
9379 | -- | |
9380 | -- Note: for the freezing circuitry, this looks like a record extension, | |
9381 | -- and so we need to make sure that the scalar storage order is the same | |
9382 | -- as that of the parent type. (This does not change anything for the | |
9383 | -- representation of the extension part.) | |
70482933 RK |
9384 | |
9385 | function Make_CW_Equivalent_Type | |
bebbff91 AC |
9386 | (T : Entity_Id; |
9387 | E : Node_Id) return Entity_Id | |
70482933 RK |
9388 | is |
9389 | Loc : constant Source_Ptr := Sloc (E); | |
9390 | Root_Typ : constant Entity_Id := Root_Type (T); | |
52ba224d | 9391 | Root_Utyp : constant Entity_Id := Underlying_Type (Root_Typ); |
fbf5a39b | 9392 | List_Def : constant List_Id := Empty_List; |
0712790c | 9393 | Comp_List : constant List_Id := New_List; |
70482933 RK |
9394 | Equiv_Type : Entity_Id; |
9395 | Range_Type : Entity_Id; | |
9396 | Str_Type : Entity_Id; | |
70482933 RK |
9397 | Constr_Root : Entity_Id; |
9398 | Sizexpr : Node_Id; | |
9399 | ||
9400 | begin | |
3e2399ba AC |
9401 | -- If the root type is already constrained, there are no discriminants |
9402 | -- in the expression. | |
9403 | ||
9404 | if not Has_Discriminants (Root_Typ) | |
9405 | or else Is_Constrained (Root_Typ) | |
9406 | then | |
70482933 | 9407 | Constr_Root := Root_Typ; |
ed09416f | 9408 | |
3f833dc2 | 9409 | -- At this point in the expansion, nonlimited view of the type |
ed09416f AC |
9410 | -- must be available, otherwise the error will be reported later. |
9411 | ||
9412 | if From_Limited_With (Constr_Root) | |
9413 | and then Present (Non_Limited_View (Constr_Root)) | |
9414 | then | |
9415 | Constr_Root := Non_Limited_View (Constr_Root); | |
9416 | end if; | |
9417 | ||
70482933 | 9418 | else |
092ef350 | 9419 | Constr_Root := Make_Temporary (Loc, 'R'); |
70482933 RK |
9420 | |
9421 | -- subtype cstr__n is T (List of discr constraints taken from Exp) | |
9422 | ||
9423 | Append_To (List_Def, | |
9424 | Make_Subtype_Declaration (Loc, | |
9425 | Defining_Identifier => Constr_Root, | |
092ef350 | 9426 | Subtype_Indication => Make_Subtype_From_Expr (E, Root_Typ))); |
70482933 RK |
9427 | end if; |
9428 | ||
0712790c | 9429 | -- Generate the range subtype declaration |
70482933 | 9430 | |
092ef350 | 9431 | Range_Type := Make_Temporary (Loc, 'G'); |
70482933 | 9432 | |
0712790c | 9433 | if not Is_Interface (Root_Typ) then |
6fb4cdde | 9434 | |
0712790c ES |
9435 | -- subtype rg__xx is |
9436 | -- Storage_Offset range 1 .. (Expr'size - typ'size) / Storage_Unit | |
9437 | ||
9438 | Sizexpr := | |
9439 | Make_Op_Subtract (Loc, | |
9440 | Left_Opnd => | |
9441 | Make_Attribute_Reference (Loc, | |
9442 | Prefix => | |
9443 | OK_Convert_To (T, Duplicate_Subexpr_No_Checks (E)), | |
9444 | Attribute_Name => Name_Size), | |
9445 | Right_Opnd => | |
9446 | Make_Attribute_Reference (Loc, | |
e4494292 | 9447 | Prefix => New_Occurrence_Of (Constr_Root, Loc), |
0712790c ES |
9448 | Attribute_Name => Name_Object_Size)); |
9449 | else | |
9450 | -- subtype rg__xx is | |
9451 | -- Storage_Offset range 1 .. Expr'size / Storage_Unit | |
9452 | ||
9453 | Sizexpr := | |
9454 | Make_Attribute_Reference (Loc, | |
9455 | Prefix => | |
9456 | OK_Convert_To (T, Duplicate_Subexpr_No_Checks (E)), | |
9457 | Attribute_Name => Name_Size); | |
9458 | end if; | |
70482933 RK |
9459 | |
9460 | Set_Paren_Count (Sizexpr, 1); | |
9461 | ||
9462 | Append_To (List_Def, | |
9463 | Make_Subtype_Declaration (Loc, | |
9464 | Defining_Identifier => Range_Type, | |
9465 | Subtype_Indication => | |
9466 | Make_Subtype_Indication (Loc, | |
e4494292 | 9467 | Subtype_Mark => New_Occurrence_Of (RTE (RE_Storage_Offset), Loc), |
70482933 RK |
9468 | Constraint => Make_Range_Constraint (Loc, |
9469 | Range_Expression => | |
9470 | Make_Range (Loc, | |
9471 | Low_Bound => Make_Integer_Literal (Loc, 1), | |
9472 | High_Bound => | |
9473 | Make_Op_Divide (Loc, | |
9474 | Left_Opnd => Sizexpr, | |
9475 | Right_Opnd => Make_Integer_Literal (Loc, | |
9476 | Intval => System_Storage_Unit))))))); | |
9477 | ||
9478 | -- subtype str__nn is Storage_Array (rg__x); | |
9479 | ||
092ef350 | 9480 | Str_Type := Make_Temporary (Loc, 'S'); |
70482933 RK |
9481 | Append_To (List_Def, |
9482 | Make_Subtype_Declaration (Loc, | |
9483 | Defining_Identifier => Str_Type, | |
9484 | Subtype_Indication => | |
9485 | Make_Subtype_Indication (Loc, | |
e4494292 | 9486 | Subtype_Mark => New_Occurrence_Of (RTE (RE_Storage_Array), Loc), |
70482933 RK |
9487 | Constraint => |
9488 | Make_Index_Or_Discriminant_Constraint (Loc, | |
9489 | Constraints => | |
e4494292 | 9490 | New_List (New_Occurrence_Of (Range_Type, Loc)))))); |
70482933 RK |
9491 | |
9492 | -- type Equiv_T is record | |
0712790c | 9493 | -- [ _parent : Tnn; ] |
70482933 RK |
9494 | -- E : Str_Type; |
9495 | -- end Equiv_T; | |
9496 | ||
092ef350 | 9497 | Equiv_Type := Make_Temporary (Loc, 'T'); |
70482933 RK |
9498 | Set_Ekind (Equiv_Type, E_Record_Type); |
9499 | Set_Parent_Subtype (Equiv_Type, Constr_Root); | |
9500 | ||
80fa4617 EB |
9501 | -- Set Is_Class_Wide_Equivalent_Type very early to trigger the special |
9502 | -- treatment for this type. In particular, even though _parent's type | |
9503 | -- is a controlled type or contains controlled components, we do not | |
9504 | -- want to set Has_Controlled_Component on it to avoid making it gain | |
9505 | -- an unwanted _controller component. | |
9506 | ||
9507 | Set_Is_Class_Wide_Equivalent_Type (Equiv_Type); | |
9508 | ||
f3296dd3 | 9509 | -- A class-wide equivalent type does not require initialization |
3dddb11e ES |
9510 | |
9511 | Set_Suppress_Initialization (Equiv_Type); | |
9512 | ||
0712790c ES |
9513 | if not Is_Interface (Root_Typ) then |
9514 | Append_To (Comp_List, | |
9515 | Make_Component_Declaration (Loc, | |
3dddb11e | 9516 | Defining_Identifier => |
0712790c ES |
9517 | Make_Defining_Identifier (Loc, Name_uParent), |
9518 | Component_Definition => | |
9519 | Make_Component_Definition (Loc, | |
9520 | Aliased_Present => False, | |
e4494292 | 9521 | Subtype_Indication => New_Occurrence_Of (Constr_Root, Loc)))); |
52ba224d | 9522 | |
dd81163f HK |
9523 | Set_Reverse_Storage_Order |
9524 | (Equiv_Type, Reverse_Storage_Order (Base_Type (Root_Utyp))); | |
9525 | Set_Reverse_Bit_Order | |
9526 | (Equiv_Type, Reverse_Bit_Order (Base_Type (Root_Utyp))); | |
0712790c ES |
9527 | end if; |
9528 | ||
9529 | Append_To (Comp_List, | |
9530 | Make_Component_Declaration (Loc, | |
092ef350 | 9531 | Defining_Identifier => Make_Temporary (Loc, 'C'), |
0712790c ES |
9532 | Component_Definition => |
9533 | Make_Component_Definition (Loc, | |
9534 | Aliased_Present => False, | |
e4494292 | 9535 | Subtype_Indication => New_Occurrence_Of (Str_Type, Loc)))); |
0712790c | 9536 | |
70482933 RK |
9537 | Append_To (List_Def, |
9538 | Make_Full_Type_Declaration (Loc, | |
9539 | Defining_Identifier => Equiv_Type, | |
3dddb11e | 9540 | Type_Definition => |
70482933 | 9541 | Make_Record_Definition (Loc, |
3dddb11e | 9542 | Component_List => |
0712790c ES |
9543 | Make_Component_List (Loc, |
9544 | Component_Items => Comp_List, | |
9545 | Variant_Part => Empty)))); | |
9546 | ||
273adcdf AC |
9547 | -- Suppress all checks during the analysis of the expanded code to avoid |
9548 | -- the generation of spurious warnings under ZFP run-time. | |
0712790c ES |
9549 | |
9550 | Insert_Actions (E, List_Def, Suppress => All_Checks); | |
70482933 RK |
9551 | return Equiv_Type; |
9552 | end Make_CW_Equivalent_Type; | |
9553 | ||
e606088a AC |
9554 | ------------------------- |
9555 | -- Make_Invariant_Call -- | |
9556 | ------------------------- | |
9557 | ||
9558 | function Make_Invariant_Call (Expr : Node_Id) return Node_Id is | |
d65a80fd HK |
9559 | Loc : constant Source_Ptr := Sloc (Expr); |
9560 | Typ : constant Entity_Id := Base_Type (Etype (Expr)); | |
3ddfabe3 | 9561 | pragma Assert (Has_Invariants (Typ)); |
b9daf13c | 9562 | Proc_Id : constant Entity_Id := Invariant_Procedure (Typ); |
3ddfabe3 | 9563 | pragma Assert (Present (Proc_Id)); |
b9daf13c BD |
9564 | begin |
9565 | -- The invariant procedure has a null body if assertions are disabled or | |
9566 | -- Assertion_Policy Ignore is in effect. In that case, generate a null | |
9567 | -- statement instead of a call to the invariant procedure. | |
2995860f | 9568 | |
b9daf13c BD |
9569 | if Has_Null_Body (Proc_Id) then |
9570 | return Make_Null_Statement (Loc); | |
9571 | else | |
9572 | return | |
9573 | Make_Procedure_Call_Statement (Loc, | |
9574 | Name => New_Occurrence_Of (Proc_Id, Loc), | |
9575 | Parameter_Associations => New_List (Relocate_Node (Expr))); | |
9576 | end if; | |
e606088a AC |
9577 | end Make_Invariant_Call; |
9578 | ||
70482933 RK |
9579 | ------------------------ |
9580 | -- Make_Literal_Range -- | |
9581 | ------------------------ | |
9582 | ||
9583 | function Make_Literal_Range | |
9584 | (Loc : Source_Ptr; | |
bebbff91 | 9585 | Literal_Typ : Entity_Id) return Node_Id |
70482933 | 9586 | is |
86cde7b1 RD |
9587 | Lo : constant Node_Id := |
9588 | New_Copy_Tree (String_Literal_Low_Bound (Literal_Typ)); | |
9589 | Index : constant Entity_Id := Etype (Lo); | |
86cde7b1 RD |
9590 | Length_Expr : constant Node_Id := |
9591 | Make_Op_Subtract (Loc, | |
90e491a7 | 9592 | Left_Opnd => |
86cde7b1 RD |
9593 | Make_Integer_Literal (Loc, |
9594 | Intval => String_Literal_Length (Literal_Typ)), | |
90e491a7 PMR |
9595 | Right_Opnd => Make_Integer_Literal (Loc, 1)); |
9596 | ||
9597 | Hi : Node_Id; | |
f91b40db | 9598 | |
70482933 | 9599 | begin |
f91b40db GB |
9600 | Set_Analyzed (Lo, False); |
9601 | ||
90e491a7 PMR |
9602 | if Is_Integer_Type (Index) then |
9603 | Hi := | |
9604 | Make_Op_Add (Loc, | |
9605 | Left_Opnd => New_Copy_Tree (Lo), | |
9606 | Right_Opnd => Length_Expr); | |
9607 | else | |
9608 | Hi := | |
9609 | Make_Attribute_Reference (Loc, | |
9610 | Attribute_Name => Name_Val, | |
9611 | Prefix => New_Occurrence_Of (Index, Loc), | |
9612 | Expressions => New_List ( | |
9613 | Make_Op_Add (Loc, | |
9614 | Left_Opnd => | |
9615 | Make_Attribute_Reference (Loc, | |
9616 | Attribute_Name => Name_Pos, | |
9617 | Prefix => New_Occurrence_Of (Index, Loc), | |
9618 | Expressions => New_List (New_Copy_Tree (Lo))), | |
9619 | Right_Opnd => Length_Expr))); | |
9620 | end if; | |
86cde7b1 | 9621 | |
90e491a7 PMR |
9622 | return |
9623 | Make_Range (Loc, | |
9624 | Low_Bound => Lo, | |
9625 | High_Bound => Hi); | |
70482933 RK |
9626 | end Make_Literal_Range; |
9627 | ||
b3b9865d AC |
9628 | -------------------------- |
9629 | -- Make_Non_Empty_Check -- | |
9630 | -------------------------- | |
9631 | ||
9632 | function Make_Non_Empty_Check | |
9633 | (Loc : Source_Ptr; | |
9634 | N : Node_Id) return Node_Id | |
9635 | is | |
9636 | begin | |
9637 | return | |
9638 | Make_Op_Ne (Loc, | |
9639 | Left_Opnd => | |
9640 | Make_Attribute_Reference (Loc, | |
9641 | Attribute_Name => Name_Length, | |
9642 | Prefix => Duplicate_Subexpr_No_Checks (N, Name_Req => True)), | |
9643 | Right_Opnd => | |
9644 | Make_Integer_Literal (Loc, 0)); | |
9645 | end Make_Non_Empty_Check; | |
9646 | ||
4818e7b9 RD |
9647 | ------------------------- |
9648 | -- Make_Predicate_Call -- | |
9649 | ------------------------- | |
9650 | ||
b0bf18ad AC |
9651 | -- WARNING: This routine manages Ghost regions. Return statements must be |
9652 | -- replaced by gotos which jump to the end of the routine and restore the | |
9653 | -- Ghost mode. | |
9654 | ||
4818e7b9 RD |
9655 | function Make_Predicate_Call |
9656 | (Typ : Entity_Id; | |
fc142f63 AC |
9657 | Expr : Node_Id; |
9658 | Mem : Boolean := False) return Node_Id | |
4818e7b9 | 9659 | is |
d65a80fd | 9660 | Loc : constant Source_Ptr := Sloc (Expr); |
241ebe89 | 9661 | |
9057bd6a HK |
9662 | Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
9663 | Saved_IGR : constant Node_Id := Ignored_Ghost_Region; | |
9664 | -- Save the Ghost-related attributes to restore on exit | |
f9a8f910 | 9665 | |
d65a80fd HK |
9666 | Call : Node_Id; |
9667 | Func_Id : Entity_Id; | |
4818e7b9 RD |
9668 | |
9669 | begin | |
ffdd5248 ES |
9670 | Func_Id := Predicate_Function (Typ); |
9671 | pragma Assert (Present (Func_Id)); | |
4818e7b9 | 9672 | |
1af4455a HK |
9673 | -- The related type may be subject to pragma Ghost. Set the mode now to |
9674 | -- ensure that the call is properly marked as Ghost. | |
241ebe89 | 9675 | |
f9a8f910 | 9676 | Set_Ghost_Mode (Typ); |
241ebe89 | 9677 | |
fc142f63 AC |
9678 | -- Call special membership version if requested and available |
9679 | ||
d65a80fd HK |
9680 | if Mem and then Present (Predicate_Function_M (Typ)) then |
9681 | Func_Id := Predicate_Function_M (Typ); | |
fc142f63 AC |
9682 | end if; |
9683 | ||
9684 | -- Case of calling normal predicate function | |
9685 | ||
98b779ae PMR |
9686 | -- If the type is tagged, the expression may be class-wide, in which |
9687 | -- case it has to be converted to its root type, given that the | |
c7862167 HK |
9688 | -- generated predicate function is not dispatching. The conversion is |
9689 | -- type-safe and does not need validation, which matters when private | |
9690 | -- extensions are involved. | |
98b779ae PMR |
9691 | |
9692 | if Is_Tagged_Type (Typ) then | |
9693 | Call := | |
9694 | Make_Function_Call (Loc, | |
9695 | Name => New_Occurrence_Of (Func_Id, Loc), | |
9696 | Parameter_Associations => | |
6cd1ee98 | 9697 | New_List (OK_Convert_To (Typ, Relocate_Node (Expr)))); |
98b779ae PMR |
9698 | else |
9699 | Call := | |
9700 | Make_Function_Call (Loc, | |
9701 | Name => New_Occurrence_Of (Func_Id, Loc), | |
9702 | Parameter_Associations => New_List (Relocate_Node (Expr))); | |
9703 | end if; | |
241ebe89 | 9704 | |
9057bd6a | 9705 | Restore_Ghost_Region (Saved_GM, Saved_IGR); |
f9a8f910 | 9706 | |
241ebe89 | 9707 | return Call; |
4818e7b9 RD |
9708 | end Make_Predicate_Call; |
9709 | ||
9710 | -------------------------- | |
9711 | -- Make_Predicate_Check -- | |
9712 | -------------------------- | |
9713 | ||
9714 | function Make_Predicate_Check | |
9715 | (Typ : Entity_Id; | |
9716 | Expr : Node_Id) return Node_Id | |
9717 | is | |
80631298 | 9718 | Loc : constant Source_Ptr := Sloc (Expr); |
88fa9a24 | 9719 | |
80631298 HK |
9720 | procedure Add_Failure_Expression (Args : List_Id); |
9721 | -- Add the failure expression of pragma Predicate_Failure (if any) to | |
9722 | -- list Args. | |
9723 | ||
9724 | ---------------------------- | |
9725 | -- Add_Failure_Expression -- | |
9726 | ---------------------------- | |
9727 | ||
9728 | procedure Add_Failure_Expression (Args : List_Id) is | |
9729 | function Failure_Expression return Node_Id; | |
9730 | pragma Inline (Failure_Expression); | |
9731 | -- Find aspect or pragma Predicate_Failure that applies to type Typ | |
9732 | -- and return its expression. Return Empty if no such annotation is | |
9733 | -- available. | |
9734 | ||
9735 | function Is_OK_PF_Aspect (Asp : Node_Id) return Boolean; | |
9736 | pragma Inline (Is_OK_PF_Aspect); | |
9737 | -- Determine whether aspect Asp is a suitable Predicate_Failure | |
9738 | -- aspect that applies to type Typ. | |
9739 | ||
9740 | function Is_OK_PF_Pragma (Prag : Node_Id) return Boolean; | |
9741 | pragma Inline (Is_OK_PF_Pragma); | |
9742 | -- Determine whether pragma Prag is a suitable Predicate_Failure | |
9743 | -- pragma that applies to type Typ. | |
9744 | ||
9745 | procedure Replace_Subtype_Reference (N : Node_Id); | |
9746 | -- Replace the current instance of type Typ denoted by N with | |
9747 | -- expression Expr. | |
9748 | ||
9749 | ------------------------ | |
9750 | -- Failure_Expression -- | |
9751 | ------------------------ | |
9752 | ||
9753 | function Failure_Expression return Node_Id is | |
9754 | Item : Node_Id; | |
9755 | ||
9756 | begin | |
9757 | -- The management of the rep item chain involves "inheritance" of | |
9758 | -- parent type chains. If a parent [sub]type is already subject to | |
9759 | -- pragma Predicate_Failure, then the pragma will also appear in | |
9760 | -- the chain of the child [sub]type, which in turn may possess a | |
9761 | -- pragma of its own. Avoid order-dependent issues by inspecting | |
9762 | -- the rep item chain directly. Note that routine Get_Pragma may | |
9763 | -- return a parent pragma. | |
9764 | ||
9765 | Item := First_Rep_Item (Typ); | |
9766 | while Present (Item) loop | |
9767 | ||
9768 | -- Predicate_Failure appears as an aspect | |
9769 | ||
9770 | if Nkind (Item) = N_Aspect_Specification | |
9771 | and then Is_OK_PF_Aspect (Item) | |
9772 | then | |
9773 | return Expression (Item); | |
9774 | ||
9775 | -- Predicate_Failure appears as a pragma | |
9776 | ||
9777 | elsif Nkind (Item) = N_Pragma | |
9778 | and then Is_OK_PF_Pragma (Item) | |
9779 | then | |
9780 | return | |
9781 | Get_Pragma_Arg | |
9782 | (Next (First (Pragma_Argument_Associations (Item)))); | |
9783 | end if; | |
9784 | ||
99859ea7 | 9785 | Next_Rep_Item (Item); |
80631298 HK |
9786 | end loop; |
9787 | ||
9788 | return Empty; | |
9789 | end Failure_Expression; | |
9790 | ||
9791 | --------------------- | |
9792 | -- Is_OK_PF_Aspect -- | |
9793 | --------------------- | |
9794 | ||
9795 | function Is_OK_PF_Aspect (Asp : Node_Id) return Boolean is | |
9796 | begin | |
9797 | -- To qualify, the aspect must apply to the type subjected to the | |
9798 | -- predicate check. | |
9799 | ||
9800 | return | |
9801 | Chars (Identifier (Asp)) = Name_Predicate_Failure | |
9802 | and then Present (Entity (Asp)) | |
9803 | and then Entity (Asp) = Typ; | |
9804 | end Is_OK_PF_Aspect; | |
9805 | ||
9806 | --------------------- | |
9807 | -- Is_OK_PF_Pragma -- | |
9808 | --------------------- | |
9809 | ||
9810 | function Is_OK_PF_Pragma (Prag : Node_Id) return Boolean is | |
9811 | Args : constant List_Id := Pragma_Argument_Associations (Prag); | |
9812 | Typ_Arg : Node_Id; | |
9813 | ||
9814 | begin | |
9815 | -- Nothing to do when the pragma does not denote Predicate_Failure | |
9816 | ||
9817 | if Pragma_Name (Prag) /= Name_Predicate_Failure then | |
9818 | return False; | |
9819 | ||
9820 | -- Nothing to do when the pragma lacks arguments, in which case it | |
9821 | -- is illegal. | |
9822 | ||
9823 | elsif No (Args) or else Is_Empty_List (Args) then | |
9824 | return False; | |
9825 | end if; | |
9826 | ||
9827 | Typ_Arg := Get_Pragma_Arg (First (Args)); | |
9828 | ||
9829 | -- To qualify, the local name argument of the pragma must denote | |
9830 | -- the type subjected to the predicate check. | |
9831 | ||
9832 | return | |
9833 | Is_Entity_Name (Typ_Arg) | |
9834 | and then Present (Entity (Typ_Arg)) | |
9835 | and then Entity (Typ_Arg) = Typ; | |
9836 | end Is_OK_PF_Pragma; | |
9837 | ||
9838 | -------------------------------- | |
9839 | -- Replace_Subtype_Reference -- | |
9840 | -------------------------------- | |
9841 | ||
9842 | procedure Replace_Subtype_Reference (N : Node_Id) is | |
9843 | begin | |
9844 | Rewrite (N, New_Copy_Tree (Expr)); | |
80631298 HK |
9845 | end Replace_Subtype_Reference; |
9846 | ||
9847 | procedure Replace_Subtype_References is | |
9848 | new Replace_Type_References_Generic (Replace_Subtype_Reference); | |
9849 | ||
9850 | -- Local variables | |
9851 | ||
9852 | PF_Expr : constant Node_Id := Failure_Expression; | |
9853 | Expr : Node_Id; | |
9854 | ||
9855 | -- Start of processing for Add_Failure_Expression | |
88fa9a24 | 9856 | |
88fa9a24 | 9857 | begin |
80631298 | 9858 | if Present (PF_Expr) then |
88fa9a24 | 9859 | |
80631298 HK |
9860 | -- Replace any occurrences of the current instance of the type |
9861 | -- with the object subjected to the predicate check. | |
88fa9a24 | 9862 | |
80631298 HK |
9863 | Expr := New_Copy_Tree (PF_Expr); |
9864 | Replace_Subtype_References (Expr, Typ); | |
88fa9a24 | 9865 | |
80631298 HK |
9866 | -- The failure expression appears as the third argument of the |
9867 | -- Check pragma. | |
9868 | ||
9869 | Append_To (Args, | |
9870 | Make_Pragma_Argument_Association (Loc, | |
9871 | Expression => Expr)); | |
9872 | end if; | |
9873 | end Add_Failure_Expression; | |
88fa9a24 ES |
9874 | |
9875 | -- Local variables | |
9876 | ||
80631298 HK |
9877 | Args : List_Id; |
9878 | Nam : Name_Id; | |
88fa9a24 ES |
9879 | |
9880 | -- Start of processing for Make_Predicate_Check | |
4818e7b9 RD |
9881 | |
9882 | begin | |
48bb06a7 AC |
9883 | -- If predicate checks are suppressed, then return a null statement. For |
9884 | -- this call, we check only the scope setting. If the caller wants to | |
9885 | -- check a specific entity's setting, they must do it manually. | |
f1c80977 AC |
9886 | |
9887 | if Predicate_Checks_Suppressed (Empty) then | |
9888 | return Make_Null_Statement (Loc); | |
9889 | end if; | |
9890 | ||
152f64c2 | 9891 | -- Do not generate a check within stream functions and the like. |
8e1e62e3 | 9892 | |
152f64c2 | 9893 | if not Predicate_Check_In_Scope (Expr) then |
8e1e62e3 AC |
9894 | return Make_Null_Statement (Loc); |
9895 | end if; | |
9896 | ||
aab45d22 | 9897 | -- Compute proper name to use, we need to get this right so that the |
16d3a853 | 9898 | -- right set of check policies apply to the Check pragma we are making. |
aab45d22 AC |
9899 | |
9900 | if Has_Dynamic_Predicate_Aspect (Typ) then | |
9901 | Nam := Name_Dynamic_Predicate; | |
9902 | elsif Has_Static_Predicate_Aspect (Typ) then | |
9903 | Nam := Name_Static_Predicate; | |
9904 | else | |
9905 | Nam := Name_Predicate; | |
9906 | end if; | |
9907 | ||
80631298 | 9908 | Args := New_List ( |
a2c314c7 AC |
9909 | Make_Pragma_Argument_Association (Loc, |
9910 | Expression => Make_Identifier (Loc, Nam)), | |
9911 | Make_Pragma_Argument_Association (Loc, | |
9912 | Expression => Make_Predicate_Call (Typ, Expr))); | |
9913 | ||
80631298 HK |
9914 | -- If the subtype is subject to pragma Predicate_Failure, add the |
9915 | -- failure expression as an additional parameter. | |
88fa9a24 | 9916 | |
80631298 | 9917 | Add_Failure_Expression (Args); |
a2c314c7 | 9918 | |
4818e7b9 RD |
9919 | return |
9920 | Make_Pragma (Loc, | |
533e3abc | 9921 | Chars => Name_Check, |
80631298 | 9922 | Pragma_Argument_Associations => Args); |
4818e7b9 RD |
9923 | end Make_Predicate_Check; |
9924 | ||
70482933 RK |
9925 | ---------------------------- |
9926 | -- Make_Subtype_From_Expr -- | |
9927 | ---------------------------- | |
9928 | ||
e14c931f RW |
9929 | -- 1. If Expr is an unconstrained array expression, creates |
9930 | -- Unc_Type(Expr'first(1)..Expr'last(1),..., Expr'first(n)..Expr'last(n)) | |
70482933 RK |
9931 | |
9932 | -- 2. If Expr is a unconstrained discriminated type expression, creates | |
9933 | -- Unc_Type(Expr.Discr1, ... , Expr.Discr_n) | |
9934 | ||
f3296dd3 | 9935 | -- 3. If Expr is class-wide, creates an implicit class-wide subtype |
70482933 RK |
9936 | |
9937 | function Make_Subtype_From_Expr | |
d9307840 HK |
9938 | (E : Node_Id; |
9939 | Unc_Typ : Entity_Id; | |
9940 | Related_Id : Entity_Id := Empty) return Node_Id | |
70482933 | 9941 | is |
fbf5a39b | 9942 | List_Constr : constant List_Id := New_List; |
d18b1548 | 9943 | Loc : constant Source_Ptr := Sloc (E); |
70482933 | 9944 | D : Entity_Id; |
d18b1548 AC |
9945 | Full_Exp : Node_Id; |
9946 | Full_Subtyp : Entity_Id; | |
9947 | High_Bound : Entity_Id; | |
9948 | Index_Typ : Entity_Id; | |
9949 | Low_Bound : Entity_Id; | |
9950 | Priv_Subtyp : Entity_Id; | |
9951 | Utyp : Entity_Id; | |
70482933 RK |
9952 | |
9953 | begin | |
9954 | if Is_Private_Type (Unc_Typ) | |
9955 | and then Has_Unknown_Discriminants (Unc_Typ) | |
9956 | then | |
2f54ef3d AC |
9957 | -- The caller requests a unique external name for both the private |
9958 | -- and the full subtype. | |
d9307840 HK |
9959 | |
9960 | if Present (Related_Id) then | |
9961 | Full_Subtyp := | |
9962 | Make_Defining_Identifier (Loc, | |
9963 | Chars => New_External_Name (Chars (Related_Id), 'C')); | |
9964 | Priv_Subtyp := | |
9965 | Make_Defining_Identifier (Loc, | |
9966 | Chars => New_External_Name (Chars (Related_Id), 'P')); | |
9967 | ||
9968 | else | |
9969 | Full_Subtyp := Make_Temporary (Loc, 'C'); | |
9970 | Priv_Subtyp := Make_Temporary (Loc, 'P'); | |
9971 | end if; | |
9972 | ||
d18b1548 AC |
9973 | -- Prepare the subtype completion. Use the base type to find the |
9974 | -- underlying type because the type may be a generic actual or an | |
9975 | -- explicit subtype. | |
70482933 | 9976 | |
d9307840 HK |
9977 | Utyp := Underlying_Type (Base_Type (Unc_Typ)); |
9978 | ||
9979 | Full_Exp := | |
092ef350 | 9980 | Unchecked_Convert_To (Utyp, Duplicate_Subexpr_No_Checks (E)); |
70482933 RK |
9981 | Set_Parent (Full_Exp, Parent (E)); |
9982 | ||
70482933 RK |
9983 | Insert_Action (E, |
9984 | Make_Subtype_Declaration (Loc, | |
9985 | Defining_Identifier => Full_Subtyp, | |
9986 | Subtype_Indication => Make_Subtype_From_Expr (Full_Exp, Utyp))); | |
9987 | ||
9988 | -- Define the dummy private subtype | |
9989 | ||
9990 | Set_Ekind (Priv_Subtyp, Subtype_Kind (Ekind (Unc_Typ))); | |
ea985d95 | 9991 | Set_Etype (Priv_Subtyp, Base_Type (Unc_Typ)); |
70482933 RK |
9992 | Set_Scope (Priv_Subtyp, Full_Subtyp); |
9993 | Set_Is_Constrained (Priv_Subtyp); | |
9994 | Set_Is_Tagged_Type (Priv_Subtyp, Is_Tagged_Type (Unc_Typ)); | |
9995 | Set_Is_Itype (Priv_Subtyp); | |
9996 | Set_Associated_Node_For_Itype (Priv_Subtyp, E); | |
9997 | ||
9998 | if Is_Tagged_Type (Priv_Subtyp) then | |
9999 | Set_Class_Wide_Type | |
10000 | (Base_Type (Priv_Subtyp), Class_Wide_Type (Unc_Typ)); | |
ef2a63ba JM |
10001 | Set_Direct_Primitive_Operations (Priv_Subtyp, |
10002 | Direct_Primitive_Operations (Unc_Typ)); | |
70482933 RK |
10003 | end if; |
10004 | ||
10005 | Set_Full_View (Priv_Subtyp, Full_Subtyp); | |
10006 | ||
e4494292 | 10007 | return New_Occurrence_Of (Priv_Subtyp, Loc); |
70482933 RK |
10008 | |
10009 | elsif Is_Array_Type (Unc_Typ) then | |
d18b1548 | 10010 | Index_Typ := First_Index (Unc_Typ); |
70482933 | 10011 | for J in 1 .. Number_Dimensions (Unc_Typ) loop |
d18b1548 AC |
10012 | |
10013 | -- Capture the bounds of each index constraint in case the context | |
10014 | -- is an object declaration of an unconstrained type initialized | |
10015 | -- by a function call: | |
10016 | ||
10017 | -- Obj : Unconstr_Typ := Func_Call; | |
10018 | ||
10019 | -- This scenario requires secondary scope management and the index | |
10020 | -- constraint cannot depend on the temporary used to capture the | |
10021 | -- result of the function call. | |
10022 | ||
10023 | -- SS_Mark; | |
10024 | -- Temp : Unconstr_Typ_Ptr := Func_Call'reference; | |
10025 | -- subtype S is Unconstr_Typ (Temp.all'First .. Temp.all'Last); | |
10026 | -- Obj : S := Temp.all; | |
10027 | -- SS_Release; -- Temp is gone at this point, bounds of S are | |
10028 | -- -- non existent. | |
10029 | ||
d18b1548 | 10030 | -- Generate: |
3fbbbd1e | 10031 | -- Low_Bound : constant Base_Type (Index_Typ) := E'First (J); |
d18b1548 AC |
10032 | |
10033 | Low_Bound := Make_Temporary (Loc, 'B'); | |
10034 | Insert_Action (E, | |
10035 | Make_Object_Declaration (Loc, | |
10036 | Defining_Identifier => Low_Bound, | |
10037 | Object_Definition => | |
10038 | New_Occurrence_Of (Base_Type (Etype (Index_Typ)), Loc), | |
3fbbbd1e | 10039 | Constant_Present => True, |
d18b1548 | 10040 | Expression => |
70482933 | 10041 | Make_Attribute_Reference (Loc, |
d18b1548 | 10042 | Prefix => Duplicate_Subexpr_No_Checks (E), |
70482933 | 10043 | Attribute_Name => Name_First, |
d18b1548 AC |
10044 | Expressions => New_List ( |
10045 | Make_Integer_Literal (Loc, J))))); | |
8cbb664e | 10046 | |
d18b1548 | 10047 | -- Generate: |
3fbbbd1e | 10048 | -- High_Bound : constant Base_Type (Index_Typ) := E'Last (J); |
d18b1548 AC |
10049 | |
10050 | High_Bound := Make_Temporary (Loc, 'B'); | |
10051 | Insert_Action (E, | |
10052 | Make_Object_Declaration (Loc, | |
10053 | Defining_Identifier => High_Bound, | |
10054 | Object_Definition => | |
10055 | New_Occurrence_Of (Base_Type (Etype (Index_Typ)), Loc), | |
3fbbbd1e | 10056 | Constant_Present => True, |
d18b1548 | 10057 | Expression => |
70482933 | 10058 | Make_Attribute_Reference (Loc, |
8cbb664e | 10059 | Prefix => Duplicate_Subexpr_No_Checks (E), |
70482933 RK |
10060 | Attribute_Name => Name_Last, |
10061 | Expressions => New_List ( | |
10062 | Make_Integer_Literal (Loc, J))))); | |
d18b1548 AC |
10063 | |
10064 | Append_To (List_Constr, | |
10065 | Make_Range (Loc, | |
10066 | Low_Bound => New_Occurrence_Of (Low_Bound, Loc), | |
10067 | High_Bound => New_Occurrence_Of (High_Bound, Loc))); | |
10068 | ||
99859ea7 | 10069 | Next_Index (Index_Typ); |
70482933 RK |
10070 | end loop; |
10071 | ||
10072 | elsif Is_Class_Wide_Type (Unc_Typ) then | |
10073 | declare | |
10074 | CW_Subtype : Entity_Id; | |
10075 | EQ_Typ : Entity_Id := Empty; | |
10076 | ||
10077 | begin | |
535a8637 | 10078 | -- A class-wide equivalent type is not needed on VM targets |
0712790c | 10079 | -- because the VM back-ends handle the class-wide object |
44d6a706 | 10080 | -- initialization itself (and doesn't need or want the |
70482933 RK |
10081 | -- additional intermediate type to handle the assignment). |
10082 | ||
1f110335 | 10083 | if Expander_Active and then Tagged_Type_Expansion then |
22cb89b5 | 10084 | |
f3296dd3 AC |
10085 | -- If this is the class-wide type of a completion that is a |
10086 | -- record subtype, set the type of the class-wide type to be | |
273adcdf AC |
10087 | -- the full base type, for use in the expanded code for the |
10088 | -- equivalent type. Should this be done earlier when the | |
10089 | -- completion is analyzed ??? | |
22cb89b5 AC |
10090 | |
10091 | if Is_Private_Type (Etype (Unc_Typ)) | |
10092 | and then | |
10093 | Ekind (Full_View (Etype (Unc_Typ))) = E_Record_Subtype | |
10094 | then | |
10095 | Set_Etype (Unc_Typ, Base_Type (Full_View (Etype (Unc_Typ)))); | |
10096 | end if; | |
10097 | ||
70482933 RK |
10098 | EQ_Typ := Make_CW_Equivalent_Type (Unc_Typ, E); |
10099 | end if; | |
10100 | ||
10101 | CW_Subtype := New_Class_Wide_Subtype (Unc_Typ, E); | |
10102 | Set_Equivalent_Type (CW_Subtype, EQ_Typ); | |
10103 | Set_Cloned_Subtype (CW_Subtype, Base_Type (Unc_Typ)); | |
10104 | ||
10105 | return New_Occurrence_Of (CW_Subtype, Loc); | |
10106 | end; | |
10107 | ||
ea985d95 | 10108 | -- Indefinite record type with discriminants |
fbf5a39b | 10109 | |
70482933 RK |
10110 | else |
10111 | D := First_Discriminant (Unc_Typ); | |
fbf5a39b | 10112 | while Present (D) loop |
70482933 RK |
10113 | Append_To (List_Constr, |
10114 | Make_Selected_Component (Loc, | |
8cbb664e | 10115 | Prefix => Duplicate_Subexpr_No_Checks (E), |
e4494292 | 10116 | Selector_Name => New_Occurrence_Of (D, Loc))); |
70482933 RK |
10117 | |
10118 | Next_Discriminant (D); | |
10119 | end loop; | |
10120 | end if; | |
10121 | ||
10122 | return | |
10123 | Make_Subtype_Indication (Loc, | |
e4494292 | 10124 | Subtype_Mark => New_Occurrence_Of (Unc_Typ, Loc), |
70482933 RK |
10125 | Constraint => |
10126 | Make_Index_Or_Discriminant_Constraint (Loc, | |
10127 | Constraints => List_Constr)); | |
10128 | end Make_Subtype_From_Expr; | |
10129 | ||
afa1ffd4 PT |
10130 | ----------------------------- |
10131 | -- Make_Variant_Comparison -- | |
10132 | ----------------------------- | |
10133 | ||
10134 | function Make_Variant_Comparison | |
10135 | (Loc : Source_Ptr; | |
10136 | Mode : Name_Id; | |
10137 | Curr_Val : Node_Id; | |
10138 | Old_Val : Node_Id) return Node_Id | |
10139 | is | |
10140 | begin | |
10141 | if Mode = Name_Increases then | |
10142 | return Make_Op_Gt (Loc, Curr_Val, Old_Val); | |
10143 | else pragma Assert (Mode = Name_Decreases); | |
10144 | return Make_Op_Lt (Loc, Curr_Val, Old_Val); | |
10145 | end if; | |
10146 | end Make_Variant_Comparison; | |
10147 | ||
b619c88e AC |
10148 | --------------- |
10149 | -- Map_Types -- | |
10150 | --------------- | |
e03f7ccf | 10151 | |
b619c88e | 10152 | procedure Map_Types (Parent_Type : Entity_Id; Derived_Type : Entity_Id) is |
e03f7ccf | 10153 | |
b619c88e AC |
10154 | -- NOTE: Most of the routines in Map_Types are intentionally unnested to |
10155 | -- avoid deep indentation of code. | |
e03f7ccf | 10156 | |
b619c88e AC |
10157 | -- NOTE: Routines which deal with discriminant mapping operate on the |
10158 | -- [underlying/record] full view of various types because those views | |
10159 | -- contain all discriminants and stored constraints. | |
e03f7ccf | 10160 | |
b619c88e AC |
10161 | procedure Add_Primitive (Prim : Entity_Id; Par_Typ : Entity_Id); |
10162 | -- Subsidiary to Map_Primitives. Find a primitive in the inheritance or | |
10163 | -- overriding chain starting from Prim whose dispatching type is parent | |
10164 | -- type Par_Typ and add a mapping between the result and primitive Prim. | |
e03f7ccf | 10165 | |
b619c88e AC |
10166 | function Ancestor_Primitive (Subp : Entity_Id) return Entity_Id; |
10167 | -- Subsidiary to Map_Primitives. Return the next ancestor primitive in | |
10168 | -- the inheritance or overriding chain of subprogram Subp. Return Empty | |
10169 | -- if no such primitive is available. | |
70482933 | 10170 | |
b619c88e AC |
10171 | function Build_Chain |
10172 | (Par_Typ : Entity_Id; | |
10173 | Deriv_Typ : Entity_Id) return Elist_Id; | |
10174 | -- Subsidiary to Map_Discriminants. Recreate the derivation chain from | |
10175 | -- parent type Par_Typ leading down towards derived type Deriv_Typ. The | |
10176 | -- list has the form: | |
10177 | -- | |
10178 | -- head tail | |
10179 | -- v v | |
10180 | -- <Ancestor_N> -> <Ancestor_N-1> -> <Ancestor_1> -> Deriv_Typ | |
10181 | -- | |
10182 | -- Note that Par_Typ is not part of the resulting derivation chain | |
70482933 | 10183 | |
b619c88e AC |
10184 | function Discriminated_View (Typ : Entity_Id) return Entity_Id; |
10185 | -- Return the view of type Typ which could potentially contains either | |
10186 | -- the discriminants or stored constraints of the type. | |
70482933 | 10187 | |
b619c88e AC |
10188 | function Find_Discriminant_Value |
10189 | (Discr : Entity_Id; | |
10190 | Par_Typ : Entity_Id; | |
10191 | Deriv_Typ : Entity_Id; | |
10192 | Typ_Elmt : Elmt_Id) return Node_Or_Entity_Id; | |
10193 | -- Subsidiary to Map_Discriminants. Find the value of discriminant Discr | |
10194 | -- in the derivation chain starting from parent type Par_Typ leading to | |
10195 | -- derived type Deriv_Typ. The returned value is one of the following: | |
10196 | -- | |
3f833dc2 | 10197 | -- * An entity which is either a discriminant or a nondiscriminant |
b619c88e AC |
10198 | -- name, and renames/constraints Discr. |
10199 | -- | |
10200 | -- * An expression which constraints Discr | |
10201 | -- | |
10202 | -- Typ_Elmt is an element of the derivation chain created by routine | |
10203 | -- Build_Chain and denotes the current ancestor being examined. | |
70482933 | 10204 | |
b619c88e AC |
10205 | procedure Map_Discriminants |
10206 | (Par_Typ : Entity_Id; | |
10207 | Deriv_Typ : Entity_Id); | |
10208 | -- Map each discriminant of type Par_Typ to a meaningful constraint | |
10209 | -- from the point of view of type Deriv_Typ. | |
70482933 | 10210 | |
b619c88e AC |
10211 | procedure Map_Primitives (Par_Typ : Entity_Id; Deriv_Typ : Entity_Id); |
10212 | -- Map each primitive of type Par_Typ to a corresponding primitive of | |
10213 | -- type Deriv_Typ. | |
70482933 | 10214 | |
b619c88e AC |
10215 | ------------------- |
10216 | -- Add_Primitive -- | |
10217 | ------------------- | |
70482933 | 10218 | |
b619c88e AC |
10219 | procedure Add_Primitive (Prim : Entity_Id; Par_Typ : Entity_Id) is |
10220 | Par_Prim : Entity_Id; | |
df3e68b1 | 10221 | |
b619c88e AC |
10222 | begin |
10223 | -- Inspect the inheritance chain through the Alias attribute and the | |
10224 | -- overriding chain through the Overridden_Operation looking for an | |
10225 | -- ancestor primitive with the appropriate dispatching type. | |
df3e68b1 | 10226 | |
b619c88e AC |
10227 | Par_Prim := Prim; |
10228 | while Present (Par_Prim) loop | |
10229 | exit when Find_Dispatching_Type (Par_Prim) = Par_Typ; | |
10230 | Par_Prim := Ancestor_Primitive (Par_Prim); | |
10231 | end loop; | |
df3e68b1 | 10232 | |
b619c88e | 10233 | -- Create a mapping of the form: |
df3e68b1 | 10234 | |
b619c88e | 10235 | -- parent type primitive -> derived type primitive |
df3e68b1 | 10236 | |
b619c88e AC |
10237 | if Present (Par_Prim) then |
10238 | Type_Map.Set (Par_Prim, Prim); | |
10239 | end if; | |
10240 | end Add_Primitive; | |
df3e68b1 | 10241 | |
b619c88e AC |
10242 | ------------------------ |
10243 | -- Ancestor_Primitive -- | |
10244 | ------------------------ | |
28ad2460 | 10245 | |
b619c88e AC |
10246 | function Ancestor_Primitive (Subp : Entity_Id) return Entity_Id is |
10247 | Inher_Prim : constant Entity_Id := Alias (Subp); | |
10248 | Over_Prim : constant Entity_Id := Overridden_Operation (Subp); | |
df3e68b1 | 10249 | |
b5360737 | 10250 | begin |
b619c88e | 10251 | -- The current subprogram overrides an ancestor primitive |
df3e68b1 | 10252 | |
b619c88e AC |
10253 | if Present (Over_Prim) then |
10254 | return Over_Prim; | |
df3e68b1 | 10255 | |
b619c88e AC |
10256 | -- The current subprogram is an internally generated alias of an |
10257 | -- inherited ancestor primitive. | |
df3e68b1 | 10258 | |
b619c88e AC |
10259 | elsif Present (Inher_Prim) then |
10260 | return Inher_Prim; | |
df3e68b1 | 10261 | |
b619c88e AC |
10262 | -- Otherwise the current subprogram is the root of the inheritance or |
10263 | -- overriding chain. | |
b5360737 | 10264 | |
28ad2460 | 10265 | else |
b619c88e | 10266 | return Empty; |
28ad2460 | 10267 | end if; |
b619c88e | 10268 | end Ancestor_Primitive; |
b5360737 | 10269 | |
b619c88e AC |
10270 | ----------------- |
10271 | -- Build_Chain -- | |
10272 | ----------------- | |
b5360737 | 10273 | |
b619c88e AC |
10274 | function Build_Chain |
10275 | (Par_Typ : Entity_Id; | |
10276 | Deriv_Typ : Entity_Id) return Elist_Id | |
10277 | is | |
10278 | Anc_Typ : Entity_Id; | |
10279 | Chain : Elist_Id; | |
10280 | Curr_Typ : Entity_Id; | |
df3e68b1 | 10281 | |
b619c88e AC |
10282 | begin |
10283 | Chain := New_Elmt_List; | |
df3e68b1 | 10284 | |
b619c88e AC |
10285 | -- Add the derived type to the derivation chain |
10286 | ||
10287 | Prepend_Elmt (Deriv_Typ, Chain); | |
10288 | ||
10289 | -- Examine all ancestors starting from the derived type climbing | |
10290 | -- towards parent type Par_Typ. | |
10291 | ||
10292 | Curr_Typ := Deriv_Typ; | |
10293 | loop | |
b6e6a4e3 AC |
10294 | -- Handle the case where the current type is a record which |
10295 | -- derives from a subtype. | |
10296 | ||
10297 | -- subtype Sub_Typ is Par_Typ ... | |
10298 | -- type Deriv_Typ is Sub_Typ ... | |
10299 | ||
10300 | if Ekind (Curr_Typ) = E_Record_Type | |
10301 | and then Present (Parent_Subtype (Curr_Typ)) | |
10302 | then | |
10303 | Anc_Typ := Parent_Subtype (Curr_Typ); | |
10304 | ||
10305 | -- Handle the case where the current type is a record subtype of | |
10306 | -- another subtype. | |
10307 | ||
10308 | -- subtype Sub_Typ1 is Par_Typ ... | |
10309 | -- subtype Sub_Typ2 is Sub_Typ1 ... | |
10310 | ||
10311 | elsif Ekind (Curr_Typ) = E_Record_Subtype | |
10312 | and then Present (Cloned_Subtype (Curr_Typ)) | |
10313 | then | |
10314 | Anc_Typ := Cloned_Subtype (Curr_Typ); | |
10315 | ||
10316 | -- Otherwise use the direct parent type | |
b619c88e | 10317 | |
b6e6a4e3 AC |
10318 | else |
10319 | Anc_Typ := Etype (Curr_Typ); | |
10320 | end if; | |
b619c88e | 10321 | |
b6e6a4e3 | 10322 | -- Use the first subtype when dealing with itypes |
b619c88e AC |
10323 | |
10324 | if Is_Itype (Anc_Typ) then | |
10325 | Anc_Typ := First_Subtype (Anc_Typ); | |
10326 | end if; | |
10327 | ||
b6e6a4e3 AC |
10328 | -- Work with the view which contains the discriminants and stored |
10329 | -- constraints. | |
10330 | ||
10331 | Anc_Typ := Discriminated_View (Anc_Typ); | |
10332 | ||
b619c88e AC |
10333 | -- Stop the climb when either the parent type has been reached or |
10334 | -- there are no more ancestors left to examine. | |
10335 | ||
10336 | exit when Anc_Typ = Curr_Typ or else Anc_Typ = Par_Typ; | |
10337 | ||
10338 | Prepend_Unique_Elmt (Anc_Typ, Chain); | |
10339 | Curr_Typ := Anc_Typ; | |
10340 | end loop; | |
10341 | ||
10342 | return Chain; | |
10343 | end Build_Chain; | |
10344 | ||
10345 | ------------------------ | |
10346 | -- Discriminated_View -- | |
10347 | ------------------------ | |
10348 | ||
10349 | function Discriminated_View (Typ : Entity_Id) return Entity_Id is | |
10350 | T : Entity_Id; | |
10351 | ||
10352 | begin | |
10353 | T := Typ; | |
10354 | ||
10355 | -- Use the [underlying] full view when dealing with private types | |
10356 | -- because the view contains all inherited discriminants or stored | |
10357 | -- constraints. | |
10358 | ||
10359 | if Is_Private_Type (T) then | |
10360 | if Present (Underlying_Full_View (T)) then | |
10361 | T := Underlying_Full_View (T); | |
10362 | ||
10363 | elsif Present (Full_View (T)) then | |
10364 | T := Full_View (T); | |
10365 | end if; | |
10366 | end if; | |
10367 | ||
10368 | -- Use the underlying record view when the type is an extenstion of | |
10369 | -- a parent type with unknown discriminants because the view contains | |
10370 | -- all inherited discriminants or stored constraints. | |
10371 | ||
10372 | if Ekind (T) = E_Record_Type | |
10373 | and then Present (Underlying_Record_View (T)) | |
10374 | then | |
10375 | T := Underlying_Record_View (T); | |
10376 | end if; | |
10377 | ||
10378 | return T; | |
10379 | end Discriminated_View; | |
10380 | ||
10381 | ----------------------------- | |
10382 | -- Find_Discriminant_Value -- | |
10383 | ----------------------------- | |
10384 | ||
10385 | function Find_Discriminant_Value | |
10386 | (Discr : Entity_Id; | |
10387 | Par_Typ : Entity_Id; | |
10388 | Deriv_Typ : Entity_Id; | |
10389 | Typ_Elmt : Elmt_Id) return Node_Or_Entity_Id | |
10390 | is | |
10391 | Discr_Pos : constant Uint := Discriminant_Number (Discr); | |
10392 | Typ : constant Entity_Id := Node (Typ_Elmt); | |
10393 | ||
10394 | function Find_Constraint_Value | |
10395 | (Constr : Node_Or_Entity_Id) return Node_Or_Entity_Id; | |
10396 | -- Given constraint Constr, find what it denotes. This is either: | |
10397 | -- | |
10398 | -- * An entity which is either a discriminant or a name | |
10399 | -- | |
10400 | -- * An expression | |
10401 | ||
10402 | --------------------------- | |
10403 | -- Find_Constraint_Value -- | |
10404 | --------------------------- | |
10405 | ||
10406 | function Find_Constraint_Value | |
10407 | (Constr : Node_Or_Entity_Id) return Node_Or_Entity_Id | |
10408 | is | |
10409 | begin | |
10410 | if Nkind (Constr) in N_Entity then | |
10411 | ||
10412 | -- The constraint denotes a discriminant of the curren type | |
10413 | -- which renames the ancestor discriminant: | |
10414 | ||
10415 | -- vv | |
10416 | -- type Typ (D1 : ...; DN : ...) is | |
10417 | -- new Anc (Discr => D1) with ... | |
10418 | -- ^^ | |
10419 | ||
10420 | if Ekind (Constr) = E_Discriminant then | |
10421 | ||
10422 | -- The discriminant belongs to derived type Deriv_Typ. This | |
10423 | -- is the final value for the ancestor discriminant as the | |
10424 | -- derivations chain has been fully exhausted. | |
10425 | ||
10426 | if Typ = Deriv_Typ then | |
10427 | return Constr; | |
10428 | ||
10429 | -- Otherwise the discriminant may be renamed or constrained | |
10430 | -- at a lower level. Continue looking down the derivation | |
10431 | -- chain. | |
10432 | ||
10433 | else | |
10434 | return | |
10435 | Find_Discriminant_Value | |
10436 | (Discr => Constr, | |
10437 | Par_Typ => Par_Typ, | |
10438 | Deriv_Typ => Deriv_Typ, | |
10439 | Typ_Elmt => Next_Elmt (Typ_Elmt)); | |
10440 | end if; | |
10441 | ||
10442 | -- Otherwise the constraint denotes a reference to some name | |
10443 | -- which results in a Girder discriminant: | |
10444 | ||
10445 | -- vvvv | |
10446 | -- Name : ...; | |
10447 | -- type Typ (D1 : ...; DN : ...) is | |
10448 | -- new Anc (Discr => Name) with ... | |
10449 | -- ^^^^ | |
10450 | ||
10451 | -- Return the name as this is the proper constraint of the | |
10452 | -- discriminant. | |
10453 | ||
10454 | else | |
10455 | return Constr; | |
10456 | end if; | |
10457 | ||
10458 | -- The constraint denotes a reference to a name | |
10459 | ||
10460 | elsif Is_Entity_Name (Constr) then | |
10461 | return Find_Constraint_Value (Entity (Constr)); | |
10462 | ||
10463 | -- Otherwise the current constraint is an expression which yields | |
10464 | -- a Girder discriminant: | |
10465 | ||
10466 | -- type Typ (D1 : ...; DN : ...) is | |
10467 | -- new Anc (Discr => <expression>) with ... | |
10468 | -- ^^^^^^^^^^ | |
10469 | ||
10470 | -- Return the expression as this is the proper constraint of the | |
10471 | -- discriminant. | |
10472 | ||
10473 | else | |
10474 | return Constr; | |
10475 | end if; | |
10476 | end Find_Constraint_Value; | |
10477 | ||
10478 | -- Local variables | |
10479 | ||
10480 | Constrs : constant Elist_Id := Stored_Constraint (Typ); | |
10481 | ||
10482 | Constr_Elmt : Elmt_Id; | |
10483 | Pos : Uint; | |
10484 | Typ_Discr : Entity_Id; | |
10485 | ||
10486 | -- Start of processing for Find_Discriminant_Value | |
10487 | ||
10488 | begin | |
10489 | -- The algorithm for finding the value of a discriminant works as | |
10490 | -- follows. First, it recreates the derivation chain from Par_Typ | |
10491 | -- to Deriv_Typ as a list: | |
10492 | ||
10493 | -- Par_Typ (shown for completeness) | |
10494 | -- v | |
10495 | -- Ancestor_N <-- head of chain | |
10496 | -- v | |
10497 | -- Ancestor_1 | |
10498 | -- v | |
10499 | -- Deriv_Typ <-- tail of chain | |
10500 | ||
10501 | -- The algorithm then traces the fate of a parent discriminant down | |
10502 | -- the derivation chain. At each derivation level, the discriminant | |
10503 | -- may be either inherited or constrained. | |
10504 | ||
10505 | -- 1) Discriminant is inherited: there are two cases, depending on | |
10506 | -- which type is inheriting. | |
10507 | ||
10508 | -- 1.1) Deriv_Typ is inheriting: | |
10509 | ||
10510 | -- type Ancestor (D_1 : ...) is tagged ... | |
10511 | -- type Deriv_Typ is new Ancestor ... | |
10512 | ||
10513 | -- In this case the inherited discriminant is the final value of | |
10514 | -- the parent discriminant because the end of the derivation chain | |
10515 | -- has been reached. | |
10516 | ||
10517 | -- 1.2) Some other type is inheriting: | |
10518 | ||
10519 | -- type Ancestor_1 (D_1 : ...) is tagged ... | |
10520 | -- type Ancestor_2 is new Ancestor_1 ... | |
10521 | ||
10522 | -- In this case the algorithm continues to trace the fate of the | |
10523 | -- inherited discriminant down the derivation chain because it may | |
10524 | -- be further inherited or constrained. | |
10525 | ||
10526 | -- 2) Discriminant is constrained: there are three cases, depending | |
10527 | -- on what the constraint is. | |
10528 | ||
10529 | -- 2.1) The constraint is another discriminant (aka renaming): | |
10530 | ||
10531 | -- type Ancestor_1 (D_1 : ...) is tagged ... | |
10532 | -- type Ancestor_2 (D_2 : ...) is new Ancestor_1 (D_1 => D_2) ... | |
10533 | ||
10534 | -- In this case the constraining discriminant becomes the one to | |
10535 | -- track down the derivation chain. The algorithm already knows | |
10536 | -- that D_2 constrains D_1, therefore if the algorithm finds the | |
10537 | -- value of D_2, then this would also be the value for D_1. | |
10538 | ||
10539 | -- 2.2) The constraint is a name (aka Girder): | |
10540 | ||
10541 | -- Name : ... | |
10542 | -- type Ancestor_1 (D_1 : ...) is tagged ... | |
10543 | -- type Ancestor_2 is new Ancestor_1 (D_1 => Name) ... | |
10544 | ||
10545 | -- In this case the name is the final value of D_1 because the | |
10546 | -- discriminant cannot be further constrained. | |
10547 | ||
10548 | -- 2.3) The constraint is an expression (aka Girder): | |
10549 | ||
10550 | -- type Ancestor_1 (D_1 : ...) is tagged ... | |
10551 | -- type Ancestor_2 is new Ancestor_1 (D_1 => 1 + 2) ... | |
10552 | ||
10553 | -- Similar to 2.2, the expression is the final value of D_1 | |
10554 | ||
10555 | Pos := Uint_1; | |
10556 | ||
10557 | -- When a derived type constrains its parent type, all constaints | |
10558 | -- appear in the Stored_Constraint list. Examine the list looking | |
10559 | -- for a positional match. | |
10560 | ||
10561 | if Present (Constrs) then | |
10562 | Constr_Elmt := First_Elmt (Constrs); | |
10563 | while Present (Constr_Elmt) loop | |
10564 | ||
10565 | -- The position of the current constraint matches that of the | |
10566 | -- ancestor discriminant. | |
10567 | ||
10568 | if Pos = Discr_Pos then | |
10569 | return Find_Constraint_Value (Node (Constr_Elmt)); | |
10570 | end if; | |
10571 | ||
10572 | Next_Elmt (Constr_Elmt); | |
10573 | Pos := Pos + 1; | |
10574 | end loop; | |
10575 | ||
10576 | -- Otherwise the derived type does not constraint its parent type in | |
10577 | -- which case it inherits the parent discriminants. | |
10578 | ||
10579 | else | |
10580 | Typ_Discr := First_Discriminant (Typ); | |
10581 | while Present (Typ_Discr) loop | |
10582 | ||
10583 | -- The position of the current discriminant matches that of the | |
10584 | -- ancestor discriminant. | |
10585 | ||
10586 | if Pos = Discr_Pos then | |
10587 | return Find_Constraint_Value (Typ_Discr); | |
10588 | end if; | |
10589 | ||
10590 | Next_Discriminant (Typ_Discr); | |
10591 | Pos := Pos + 1; | |
10592 | end loop; | |
10593 | end if; | |
10594 | ||
10595 | -- A discriminant must always have a corresponding value. This is | |
10596 | -- either another discriminant, a name, or an expression. If this | |
10597 | -- point is reached, them most likely the derivation chain employs | |
10598 | -- the wrong views of types. | |
10599 | ||
10600 | pragma Assert (False); | |
10601 | ||
10602 | return Empty; | |
10603 | end Find_Discriminant_Value; | |
10604 | ||
10605 | ----------------------- | |
10606 | -- Map_Discriminants -- | |
10607 | ----------------------- | |
10608 | ||
10609 | procedure Map_Discriminants | |
10610 | (Par_Typ : Entity_Id; | |
10611 | Deriv_Typ : Entity_Id) | |
10612 | is | |
10613 | Deriv_Chain : constant Elist_Id := Build_Chain (Par_Typ, Deriv_Typ); | |
10614 | ||
10615 | Discr : Entity_Id; | |
10616 | Discr_Val : Node_Or_Entity_Id; | |
10617 | ||
10618 | begin | |
10619 | -- Examine each discriminant of parent type Par_Typ and find a | |
10620 | -- suitable value for it from the point of view of derived type | |
10621 | -- Deriv_Typ. | |
10622 | ||
10623 | if Has_Discriminants (Par_Typ) then | |
10624 | Discr := First_Discriminant (Par_Typ); | |
10625 | while Present (Discr) loop | |
10626 | Discr_Val := | |
10627 | Find_Discriminant_Value | |
10628 | (Discr => Discr, | |
10629 | Par_Typ => Par_Typ, | |
10630 | Deriv_Typ => Deriv_Typ, | |
10631 | Typ_Elmt => First_Elmt (Deriv_Chain)); | |
10632 | ||
10633 | -- Create a mapping of the form: | |
10634 | ||
10635 | -- parent type discriminant -> value | |
10636 | ||
10637 | Type_Map.Set (Discr, Discr_Val); | |
10638 | ||
10639 | Next_Discriminant (Discr); | |
10640 | end loop; | |
10641 | end if; | |
10642 | end Map_Discriminants; | |
10643 | ||
10644 | -------------------- | |
10645 | -- Map_Primitives -- | |
10646 | -------------------- | |
10647 | ||
10648 | procedure Map_Primitives (Par_Typ : Entity_Id; Deriv_Typ : Entity_Id) is | |
10649 | Deriv_Prim : Entity_Id; | |
10650 | Par_Prim : Entity_Id; | |
10651 | Par_Prims : Elist_Id; | |
10652 | Prim_Elmt : Elmt_Id; | |
10653 | ||
10654 | begin | |
10655 | -- Inspect the primitives of the derived type and determine whether | |
10656 | -- they relate to the primitives of the parent type. If there is a | |
10657 | -- meaningful relation, create a mapping of the form: | |
10658 | ||
10659 | -- parent type primitive -> perived type primitive | |
10660 | ||
10661 | if Present (Direct_Primitive_Operations (Deriv_Typ)) then | |
10662 | Prim_Elmt := First_Elmt (Direct_Primitive_Operations (Deriv_Typ)); | |
10663 | while Present (Prim_Elmt) loop | |
10664 | Deriv_Prim := Node (Prim_Elmt); | |
10665 | ||
10666 | if Is_Subprogram (Deriv_Prim) | |
10667 | and then Find_Dispatching_Type (Deriv_Prim) = Deriv_Typ | |
10668 | then | |
10669 | Add_Primitive (Deriv_Prim, Par_Typ); | |
10670 | end if; | |
10671 | ||
10672 | Next_Elmt (Prim_Elmt); | |
10673 | end loop; | |
10674 | end if; | |
10675 | ||
10676 | -- If the parent operation is an interface operation, the overriding | |
10677 | -- indicator is not present. Instead, we get from the interface | |
10678 | -- operation the primitive of the current type that implements it. | |
10679 | ||
10680 | if Is_Interface (Par_Typ) then | |
10681 | Par_Prims := Collect_Primitive_Operations (Par_Typ); | |
10682 | ||
10683 | if Present (Par_Prims) then | |
10684 | Prim_Elmt := First_Elmt (Par_Prims); | |
10685 | ||
10686 | while Present (Prim_Elmt) loop | |
10687 | Par_Prim := Node (Prim_Elmt); | |
10688 | Deriv_Prim := | |
10689 | Find_Primitive_Covering_Interface (Deriv_Typ, Par_Prim); | |
10690 | ||
10691 | if Present (Deriv_Prim) then | |
10692 | Type_Map.Set (Par_Prim, Deriv_Prim); | |
10693 | end if; | |
10694 | ||
10695 | Next_Elmt (Prim_Elmt); | |
10696 | end loop; | |
10697 | end if; | |
10698 | end if; | |
10699 | end Map_Primitives; | |
10700 | ||
10701 | -- Start of processing for Map_Types | |
10702 | ||
10703 | begin | |
10704 | -- Nothing to do if there are no types to work with | |
10705 | ||
10706 | if No (Parent_Type) or else No (Derived_Type) then | |
10707 | return; | |
10708 | ||
10709 | -- Nothing to do if the mapping already exists | |
10710 | ||
10711 | elsif Type_Map.Get (Parent_Type) = Derived_Type then | |
10712 | return; | |
10713 | ||
10714 | -- Nothing to do if both types are not tagged. Note that untagged types | |
10715 | -- do not have primitive operations and their discriminants are already | |
10716 | -- handled by gigi. | |
10717 | ||
10718 | elsif not Is_Tagged_Type (Parent_Type) | |
10719 | or else not Is_Tagged_Type (Derived_Type) | |
10720 | then | |
10721 | return; | |
10722 | end if; | |
10723 | ||
10724 | -- Create a mapping of the form | |
10725 | ||
10726 | -- parent type -> derived type | |
10727 | ||
10728 | -- to prevent any subsequent attempts to produce the same relations | |
10729 | ||
10730 | Type_Map.Set (Parent_Type, Derived_Type); | |
10731 | ||
10732 | -- Create mappings of the form | |
10733 | ||
10734 | -- parent type discriminant -> derived type discriminant | |
10735 | -- <or> | |
10736 | -- parent type discriminant -> constraint | |
10737 | ||
10738 | -- Note that mapping of discriminants breaks privacy because it needs to | |
10739 | -- work with those views which contains the discriminants and any stored | |
10740 | -- constraints. | |
10741 | ||
10742 | Map_Discriminants | |
10743 | (Par_Typ => Discriminated_View (Parent_Type), | |
10744 | Deriv_Typ => Discriminated_View (Derived_Type)); | |
10745 | ||
10746 | -- Create mappings of the form | |
10747 | ||
10748 | -- parent type primitive -> derived type primitive | |
10749 | ||
10750 | Map_Primitives | |
10751 | (Par_Typ => Parent_Type, | |
10752 | Deriv_Typ => Derived_Type); | |
10753 | end Map_Types; | |
10754 | ||
10755 | ---------------------------- | |
10756 | -- Matching_Standard_Type -- | |
10757 | ---------------------------- | |
10758 | ||
10759 | function Matching_Standard_Type (Typ : Entity_Id) return Entity_Id is | |
10760 | pragma Assert (Is_Scalar_Type (Typ)); | |
10761 | Siz : constant Uint := Esize (Typ); | |
10762 | ||
10763 | begin | |
10764 | -- Floating-point cases | |
10765 | ||
10766 | if Is_Floating_Point_Type (Typ) then | |
10767 | if Siz <= Esize (Standard_Short_Float) then | |
10768 | return Standard_Short_Float; | |
10769 | elsif Siz <= Esize (Standard_Float) then | |
10770 | return Standard_Float; | |
10771 | elsif Siz <= Esize (Standard_Long_Float) then | |
10772 | return Standard_Long_Float; | |
10773 | elsif Siz <= Esize (Standard_Long_Long_Float) then | |
10774 | return Standard_Long_Long_Float; | |
10775 | else | |
10776 | raise Program_Error; | |
10777 | end if; | |
10778 | ||
10779 | -- Integer cases (includes fixed-point types) | |
10780 | ||
10781 | -- Unsigned integer cases (includes normal enumeration types) | |
10782 | ||
b619c88e | 10783 | else |
c7c7dd3a | 10784 | return Small_Integer_Type_For (Siz, Is_Unsigned_Type (Typ)); |
b619c88e AC |
10785 | end if; |
10786 | end Matching_Standard_Type; | |
10787 | ||
10788 | ----------------------------- | |
10789 | -- May_Generate_Large_Temp -- | |
10790 | ----------------------------- | |
10791 | ||
10792 | -- At the current time, the only types that we return False for (i.e. where | |
10793 | -- we decide we know they cannot generate large temps) are ones where we | |
10794 | -- know the size is 256 bits or less at compile time, and we are still not | |
10795 | -- doing a thorough job on arrays and records ??? | |
10796 | ||
10797 | function May_Generate_Large_Temp (Typ : Entity_Id) return Boolean is | |
10798 | begin | |
10799 | if not Size_Known_At_Compile_Time (Typ) then | |
10800 | return False; | |
10801 | ||
10802 | elsif Esize (Typ) /= 0 and then Esize (Typ) <= 256 then | |
10803 | return False; | |
10804 | ||
10805 | elsif Is_Array_Type (Typ) | |
10806 | and then Present (Packed_Array_Impl_Type (Typ)) | |
10807 | then | |
10808 | return May_Generate_Large_Temp (Packed_Array_Impl_Type (Typ)); | |
10809 | ||
10810 | -- We could do more here to find other small types ??? | |
10811 | ||
10812 | else | |
10813 | return True; | |
10814 | end if; | |
10815 | end May_Generate_Large_Temp; | |
10816 | ||
341e0bb6 JS |
10817 | -------------------------------------------- |
10818 | -- Needs_Conditional_Null_Excluding_Check -- | |
10819 | -------------------------------------------- | |
10820 | ||
10821 | function Needs_Conditional_Null_Excluding_Check | |
10822 | (Typ : Entity_Id) return Boolean | |
10823 | is | |
10824 | begin | |
f537fc00 HK |
10825 | return |
10826 | Is_Array_Type (Typ) and then Can_Never_Be_Null (Component_Type (Typ)); | |
341e0bb6 JS |
10827 | end Needs_Conditional_Null_Excluding_Check; |
10828 | ||
10829 | ---------------------------- | |
10830 | -- Needs_Constant_Address -- | |
10831 | ---------------------------- | |
10832 | ||
10833 | function Needs_Constant_Address | |
10834 | (Decl : Node_Id; | |
10835 | Typ : Entity_Id) return Boolean | |
10836 | is | |
10837 | begin | |
10838 | -- If we have no initialization of any kind, then we don't need to place | |
10839 | -- any restrictions on the address clause, because the object will be | |
10840 | -- elaborated after the address clause is evaluated. This happens if the | |
10841 | -- declaration has no initial expression, or the type has no implicit | |
10842 | -- initialization, or the object is imported. | |
10843 | ||
10844 | -- The same holds for all initialized scalar types and all access types. | |
c7c7dd3a EB |
10845 | -- Packed bit array types of size up to the maximum integer size are |
10846 | -- represented using a modular type with an initialization (to zero) and | |
10847 | -- can be processed like other initialized scalar types. | |
341e0bb6 JS |
10848 | |
10849 | -- If the type is controlled, code to attach the object to a | |
10850 | -- finalization chain is generated at the point of declaration, and | |
10851 | -- therefore the elaboration of the object cannot be delayed: the | |
10852 | -- address expression must be a constant. | |
10853 | ||
10854 | if No (Expression (Decl)) | |
10855 | and then not Needs_Finalization (Typ) | |
10856 | and then | |
10857 | (not Has_Non_Null_Base_Init_Proc (Typ) | |
10858 | or else Is_Imported (Defining_Identifier (Decl))) | |
10859 | then | |
10860 | return False; | |
10861 | ||
10862 | elsif (Present (Expression (Decl)) and then Is_Scalar_Type (Typ)) | |
10863 | or else Is_Access_Type (Typ) | |
10864 | or else | |
10865 | (Is_Bit_Packed_Array (Typ) | |
10866 | and then Is_Modular_Integer_Type (Packed_Array_Impl_Type (Typ))) | |
10867 | then | |
10868 | return False; | |
10869 | ||
10870 | else | |
341e0bb6 JS |
10871 | -- Otherwise, we require the address clause to be constant because |
10872 | -- the call to the initialization procedure (or the attach code) has | |
10873 | -- to happen at the point of the declaration. | |
10874 | ||
10875 | -- Actually the IP call has been moved to the freeze actions anyway, | |
10876 | -- so maybe we can relax this restriction??? | |
10877 | ||
10878 | return True; | |
10879 | end if; | |
10880 | end Needs_Constant_Address; | |
10881 | ||
70482933 RK |
10882 | ---------------------------- |
10883 | -- New_Class_Wide_Subtype -- | |
10884 | ---------------------------- | |
10885 | ||
10886 | function New_Class_Wide_Subtype | |
10887 | (CW_Typ : Entity_Id; | |
bebbff91 | 10888 | N : Node_Id) return Entity_Id |
70482933 | 10889 | is |
fa3717c1 HK |
10890 | Res : constant Entity_Id := Create_Itype (E_Void, N); |
10891 | ||
10892 | -- Capture relevant attributes of the class-wide subtype which must be | |
10893 | -- restored after the copy. | |
10894 | ||
10895 | Res_Chars : constant Name_Id := Chars (Res); | |
10896 | Res_Is_CGE : constant Boolean := Is_Checked_Ghost_Entity (Res); | |
10897 | Res_Is_IGE : constant Boolean := Is_Ignored_Ghost_Entity (Res); | |
10898 | Res_Is_IGN : constant Boolean := Is_Ignored_Ghost_Node (Res); | |
10899 | Res_Scope : constant Entity_Id := Scope (Res); | |
70482933 RK |
10900 | |
10901 | begin | |
10902 | Copy_Node (CW_Typ, Res); | |
fa3717c1 HK |
10903 | |
10904 | -- Restore the relevant attributes of the class-wide subtype | |
10905 | ||
10906 | Set_Chars (Res, Res_Chars); | |
10907 | Set_Is_Checked_Ghost_Entity (Res, Res_Is_CGE); | |
10908 | Set_Is_Ignored_Ghost_Entity (Res, Res_Is_IGE); | |
10909 | Set_Is_Ignored_Ghost_Node (Res, Res_Is_IGN); | |
10910 | Set_Scope (Res, Res_Scope); | |
10911 | ||
10912 | -- Decorate the class-wide subtype | |
10913 | ||
70482933 | 10914 | Set_Associated_Node_For_Itype (Res, N); |
fa3717c1 HK |
10915 | Set_Comes_From_Source (Res, False); |
10916 | Set_Ekind (Res, E_Class_Wide_Subtype); | |
10917 | Set_Etype (Res, Base_Type (CW_Typ)); | |
10918 | Set_Freeze_Node (Res, Empty); | |
10919 | Set_Is_Frozen (Res, False); | |
10920 | Set_Is_Itype (Res); | |
10921 | Set_Is_Public (Res, False); | |
10922 | Set_Next_Entity (Res, Empty); | |
3f6d1daa | 10923 | Set_Prev_Entity (Res, Empty); |
fa3717c1 HK |
10924 | Set_Sloc (Res, Sloc (N)); |
10925 | ||
70482933 | 10926 | Set_Public_Status (Res); |
fa3717c1 HK |
10927 | |
10928 | return Res; | |
70482933 RK |
10929 | end New_Class_Wide_Subtype; |
10930 | ||
59e54267 ES |
10931 | ----------------------------------- |
10932 | -- OK_To_Do_Constant_Replacement -- | |
10933 | ----------------------------------- | |
10934 | ||
10935 | function OK_To_Do_Constant_Replacement (E : Entity_Id) return Boolean is | |
10936 | ES : constant Entity_Id := Scope (E); | |
10937 | CS : Entity_Id; | |
10938 | ||
10939 | begin | |
10940 | -- Do not replace statically allocated objects, because they may be | |
10941 | -- modified outside the current scope. | |
10942 | ||
10943 | if Is_Statically_Allocated (E) then | |
10944 | return False; | |
10945 | ||
10946 | -- Do not replace aliased or volatile objects, since we don't know what | |
10947 | -- else might change the value. | |
10948 | ||
10949 | elsif Is_Aliased (E) or else Treat_As_Volatile (E) then | |
10950 | return False; | |
10951 | ||
10952 | -- Debug flag -gnatdM disconnects this optimization | |
10953 | ||
10954 | elsif Debug_Flag_MM then | |
10955 | return False; | |
10956 | ||
10957 | -- Otherwise check scopes | |
10958 | ||
10959 | else | |
59e54267 ES |
10960 | CS := Current_Scope; |
10961 | ||
10962 | loop | |
10963 | -- If we are in right scope, replacement is safe | |
10964 | ||
10965 | if CS = ES then | |
10966 | return True; | |
10967 | ||
10968 | -- Packages do not affect the determination of safety | |
10969 | ||
10970 | elsif Ekind (CS) = E_Package then | |
59e54267 | 10971 | exit when CS = Standard_Standard; |
05350ac6 | 10972 | CS := Scope (CS); |
59e54267 ES |
10973 | |
10974 | -- Blocks do not affect the determination of safety | |
10975 | ||
10976 | elsif Ekind (CS) = E_Block then | |
10977 | CS := Scope (CS); | |
10978 | ||
05350ac6 BD |
10979 | -- Loops do not affect the determination of safety. Note that we |
10980 | -- kill all current values on entry to a loop, so we are just | |
10981 | -- talking about processing within a loop here. | |
10982 | ||
10983 | elsif Ekind (CS) = E_Loop then | |
10984 | CS := Scope (CS); | |
10985 | ||
59e54267 ES |
10986 | -- Otherwise, the reference is dubious, and we cannot be sure that |
10987 | -- it is safe to do the replacement. | |
10988 | ||
10989 | else | |
10990 | exit; | |
10991 | end if; | |
10992 | end loop; | |
10993 | ||
10994 | return False; | |
10995 | end if; | |
10996 | end OK_To_Do_Constant_Replacement; | |
10997 | ||
0712790c ES |
10998 | ------------------------------------ |
10999 | -- Possible_Bit_Aligned_Component -- | |
11000 | ------------------------------------ | |
11001 | ||
11002 | function Possible_Bit_Aligned_Component (N : Node_Id) return Boolean is | |
11003 | begin | |
184a23e9 HK |
11004 | -- Do not process an unanalyzed node because it is not yet decorated and |
11005 | -- most checks performed below will fail. | |
11006 | ||
11007 | if not Analyzed (N) then | |
11008 | return False; | |
11009 | end if; | |
11010 | ||
f167c735 AC |
11011 | -- There are never alignment issues in CodePeer mode |
11012 | ||
11013 | if CodePeer_Mode then | |
11014 | return False; | |
11015 | end if; | |
11016 | ||
0712790c ES |
11017 | case Nkind (N) is |
11018 | ||
11019 | -- Case of indexed component | |
11020 | ||
11021 | when N_Indexed_Component => | |
11022 | declare | |
11023 | P : constant Node_Id := Prefix (N); | |
11024 | Ptyp : constant Entity_Id := Etype (P); | |
11025 | ||
11026 | begin | |
c7c7dd3a EB |
11027 | -- If we know the component size and it is not larger than the |
11028 | -- maximum integer size, then we are OK. The back end does the | |
11029 | -- assignment of small misaligned objects correctly. | |
0712790c ES |
11030 | |
11031 | if Known_Static_Component_Size (Ptyp) | |
c7c7dd3a | 11032 | and then Component_Size (Ptyp) <= System_Max_Integer_Size |
0712790c ES |
11033 | then |
11034 | return False; | |
11035 | ||
11036 | -- Otherwise, we need to test the prefix, to see if we are | |
11037 | -- indexing from a possibly unaligned component. | |
11038 | ||
11039 | else | |
11040 | return Possible_Bit_Aligned_Component (P); | |
11041 | end if; | |
11042 | end; | |
11043 | ||
11044 | -- Case of selected component | |
11045 | ||
11046 | when N_Selected_Component => | |
11047 | declare | |
11048 | P : constant Node_Id := Prefix (N); | |
11049 | Comp : constant Entity_Id := Entity (Selector_Name (N)); | |
11050 | ||
11051 | begin | |
fba9fcae EB |
11052 | -- This is the crucial test: if the component itself causes |
11053 | -- trouble, then we can stop and return True. | |
0712790c ES |
11054 | |
11055 | if Component_May_Be_Bit_Aligned (Comp) then | |
11056 | return True; | |
fba9fcae EB |
11057 | |
11058 | -- Otherwise, we need to test the prefix, to see if we are | |
11059 | -- selecting from a possibly unaligned component. | |
11060 | ||
0712790c ES |
11061 | else |
11062 | return Possible_Bit_Aligned_Component (P); | |
11063 | end if; | |
11064 | end; | |
11065 | ||
65df5b71 | 11066 | -- For a slice, test the prefix, if that is possibly misaligned, |
a90bd866 | 11067 | -- then for sure the slice is. |
65df5b71 HK |
11068 | |
11069 | when N_Slice => | |
11070 | return Possible_Bit_Aligned_Component (Prefix (N)); | |
11071 | ||
83de674b | 11072 | -- For an unchecked conversion, check whether the expression may |
fba9fcae | 11073 | -- be bit aligned. |
83de674b AC |
11074 | |
11075 | when N_Unchecked_Type_Conversion => | |
11076 | return Possible_Bit_Aligned_Component (Expression (N)); | |
11077 | ||
65df5b71 HK |
11078 | -- If we have none of the above, it means that we have fallen off the |
11079 | -- top testing prefixes recursively, and we now have a stand alone | |
469fba4a AC |
11080 | -- object, where we don't have a problem, unless this is a renaming, |
11081 | -- in which case we need to look into the renamed object. | |
0712790c ES |
11082 | |
11083 | when others => | |
469fba4a AC |
11084 | if Is_Entity_Name (N) |
11085 | and then Present (Renamed_Object (Entity (N))) | |
11086 | then | |
11087 | return | |
11088 | Possible_Bit_Aligned_Component (Renamed_Object (Entity (N))); | |
11089 | else | |
11090 | return False; | |
11091 | end if; | |
0712790c ES |
11092 | end case; |
11093 | end Possible_Bit_Aligned_Component; | |
11094 | ||
2ba7e31e AC |
11095 | ----------------------------------------------- |
11096 | -- Process_Statements_For_Controlled_Objects -- | |
11097 | ----------------------------------------------- | |
11098 | ||
11099 | procedure Process_Statements_For_Controlled_Objects (N : Node_Id) is | |
11100 | Loc : constant Source_Ptr := Sloc (N); | |
11101 | ||
11102 | function Are_Wrapped (L : List_Id) return Boolean; | |
11103 | -- Determine whether list L contains only one statement which is a block | |
11104 | ||
7edfb4c6 HK |
11105 | function Wrap_Statements_In_Block |
11106 | (L : List_Id; | |
11107 | Scop : Entity_Id := Current_Scope) return Node_Id; | |
2ba7e31e | 11108 | -- Given a list of statements L, wrap it in a block statement and return |
7edfb4c6 HK |
11109 | -- the generated node. Scop is either the current scope or the scope of |
11110 | -- the context (if applicable). | |
2ba7e31e AC |
11111 | |
11112 | ----------------- | |
11113 | -- Are_Wrapped -- | |
11114 | ----------------- | |
11115 | ||
11116 | function Are_Wrapped (L : List_Id) return Boolean is | |
11117 | Stmt : constant Node_Id := First (L); | |
2ba7e31e AC |
11118 | begin |
11119 | return | |
11120 | Present (Stmt) | |
11121 | and then No (Next (Stmt)) | |
11122 | and then Nkind (Stmt) = N_Block_Statement; | |
11123 | end Are_Wrapped; | |
11124 | ||
11125 | ------------------------------ | |
11126 | -- Wrap_Statements_In_Block -- | |
11127 | ------------------------------ | |
11128 | ||
7edfb4c6 HK |
11129 | function Wrap_Statements_In_Block |
11130 | (L : List_Id; | |
11131 | Scop : Entity_Id := Current_Scope) return Node_Id | |
11132 | is | |
11133 | Block_Id : Entity_Id; | |
11134 | Block_Nod : Node_Id; | |
11135 | Iter_Loop : Entity_Id; | |
11136 | ||
2ba7e31e | 11137 | begin |
7edfb4c6 | 11138 | Block_Nod := |
2ba7e31e | 11139 | Make_Block_Statement (Loc, |
7edfb4c6 | 11140 | Declarations => No_List, |
2ba7e31e AC |
11141 | Handled_Statement_Sequence => |
11142 | Make_Handled_Sequence_Of_Statements (Loc, | |
11143 | Statements => L)); | |
7edfb4c6 HK |
11144 | |
11145 | -- Create a label for the block in case the block needs to manage the | |
11146 | -- secondary stack. A label allows for flag Uses_Sec_Stack to be set. | |
11147 | ||
11148 | Add_Block_Identifier (Block_Nod, Block_Id); | |
11149 | ||
11150 | -- When wrapping the statements of an iterator loop, check whether | |
11151 | -- the loop requires secondary stack management and if so, propagate | |
3b8481cb | 11152 | -- the appropriate flags to the block. This ensures that the cursor |
c624298a | 11153 | -- is properly cleaned up at each iteration of the loop. |
7edfb4c6 HK |
11154 | |
11155 | Iter_Loop := Find_Enclosing_Iterator_Loop (Scop); | |
11156 | ||
3b8481cb | 11157 | if Present (Iter_Loop) then |
c624298a AC |
11158 | Set_Uses_Sec_Stack (Block_Id, Uses_Sec_Stack (Iter_Loop)); |
11159 | ||
11160 | -- Secondary stack reclamation is suppressed when the associated | |
11161 | -- iterator loop contains a return statement which uses the stack. | |
11162 | ||
3b8481cb AC |
11163 | Set_Sec_Stack_Needed_For_Return |
11164 | (Block_Id, Sec_Stack_Needed_For_Return (Iter_Loop)); | |
7edfb4c6 HK |
11165 | end if; |
11166 | ||
11167 | return Block_Nod; | |
2ba7e31e AC |
11168 | end Wrap_Statements_In_Block; |
11169 | ||
25b589cb AC |
11170 | -- Local variables |
11171 | ||
11172 | Block : Node_Id; | |
11173 | ||
2ba7e31e AC |
11174 | -- Start of processing for Process_Statements_For_Controlled_Objects |
11175 | ||
11176 | begin | |
25b589cb AC |
11177 | -- Whenever a non-handled statement list is wrapped in a block, the |
11178 | -- block must be explicitly analyzed to redecorate all entities in the | |
11179 | -- list and ensure that a finalizer is properly built. | |
11180 | ||
2ba7e31e | 11181 | case Nkind (N) is |
d8f43ee6 HK |
11182 | when N_Conditional_Entry_Call |
11183 | | N_Elsif_Part | |
11184 | | N_If_Statement | |
11185 | | N_Selective_Accept | |
11186 | => | |
2ba7e31e AC |
11187 | -- Check the "then statements" for elsif parts and if statements |
11188 | ||
4a08c95c | 11189 | if Nkind (N) in N_Elsif_Part | N_If_Statement |
2ba7e31e AC |
11190 | and then not Is_Empty_List (Then_Statements (N)) |
11191 | and then not Are_Wrapped (Then_Statements (N)) | |
11192 | and then Requires_Cleanup_Actions | |
c581c520 PMR |
11193 | (L => Then_Statements (N), |
11194 | Lib_Level => False, | |
40c21e91 | 11195 | Nested_Constructs => False) |
2ba7e31e | 11196 | then |
25b589cb AC |
11197 | Block := Wrap_Statements_In_Block (Then_Statements (N)); |
11198 | Set_Then_Statements (N, New_List (Block)); | |
11199 | ||
11200 | Analyze (Block); | |
2ba7e31e AC |
11201 | end if; |
11202 | ||
11203 | -- Check the "else statements" for conditional entry calls, if | |
11204 | -- statements and selective accepts. | |
11205 | ||
4a08c95c AC |
11206 | if Nkind (N) in |
11207 | N_Conditional_Entry_Call | N_If_Statement | N_Selective_Accept | |
2ba7e31e AC |
11208 | and then not Is_Empty_List (Else_Statements (N)) |
11209 | and then not Are_Wrapped (Else_Statements (N)) | |
11210 | and then Requires_Cleanup_Actions | |
c581c520 PMR |
11211 | (L => Else_Statements (N), |
11212 | Lib_Level => False, | |
40c21e91 | 11213 | Nested_Constructs => False) |
2ba7e31e | 11214 | then |
25b589cb AC |
11215 | Block := Wrap_Statements_In_Block (Else_Statements (N)); |
11216 | Set_Else_Statements (N, New_List (Block)); | |
11217 | ||
11218 | Analyze (Block); | |
2ba7e31e AC |
11219 | end if; |
11220 | ||
d8f43ee6 HK |
11221 | when N_Abortable_Part |
11222 | | N_Accept_Alternative | |
11223 | | N_Case_Statement_Alternative | |
11224 | | N_Delay_Alternative | |
11225 | | N_Entry_Call_Alternative | |
11226 | | N_Exception_Handler | |
11227 | | N_Loop_Statement | |
11228 | | N_Triggering_Alternative | |
11229 | => | |
2ba7e31e AC |
11230 | if not Is_Empty_List (Statements (N)) |
11231 | and then not Are_Wrapped (Statements (N)) | |
40c21e91 | 11232 | and then Requires_Cleanup_Actions |
c581c520 PMR |
11233 | (L => Statements (N), |
11234 | Lib_Level => False, | |
40c21e91 | 11235 | Nested_Constructs => False) |
2ba7e31e | 11236 | then |
7edfb4c6 HK |
11237 | if Nkind (N) = N_Loop_Statement |
11238 | and then Present (Identifier (N)) | |
11239 | then | |
11240 | Block := | |
11241 | Wrap_Statements_In_Block | |
11242 | (L => Statements (N), | |
11243 | Scop => Entity (Identifier (N))); | |
11244 | else | |
11245 | Block := Wrap_Statements_In_Block (Statements (N)); | |
11246 | end if; | |
25b589cb | 11247 | |
7edfb4c6 | 11248 | Set_Statements (N, New_List (Block)); |
25b589cb | 11249 | Analyze (Block); |
2ba7e31e AC |
11250 | end if; |
11251 | ||
fb9dd1c7 PMR |
11252 | -- Could be e.g. a loop that was transformed into a block or null |
11253 | -- statement. Do nothing for terminate alternatives. | |
11254 | ||
e201023c PMR |
11255 | when N_Block_Statement |
11256 | | N_Null_Statement | |
11257 | | N_Terminate_Alternative | |
11258 | => | |
2ba7e31e | 11259 | null; |
fb9dd1c7 PMR |
11260 | |
11261 | when others => | |
11262 | raise Program_Error; | |
2ba7e31e AC |
11263 | end case; |
11264 | end Process_Statements_For_Controlled_Objects; | |
11265 | ||
2c9f8c0a AC |
11266 | ------------------ |
11267 | -- Power_Of_Two -- | |
11268 | ------------------ | |
11269 | ||
11270 | function Power_Of_Two (N : Node_Id) return Nat is | |
11271 | Typ : constant Entity_Id := Etype (N); | |
11272 | pragma Assert (Is_Integer_Type (Typ)); | |
02bb0765 | 11273 | |
2c9f8c0a AC |
11274 | Siz : constant Nat := UI_To_Int (Esize (Typ)); |
11275 | Val : Uint; | |
11276 | ||
11277 | begin | |
11278 | if not Compile_Time_Known_Value (N) then | |
11279 | return 0; | |
11280 | ||
11281 | else | |
11282 | Val := Expr_Value (N); | |
11283 | for J in 1 .. Siz - 1 loop | |
11284 | if Val = Uint_2 ** J then | |
11285 | return J; | |
11286 | end if; | |
11287 | end loop; | |
11288 | ||
11289 | return 0; | |
11290 | end if; | |
11291 | end Power_Of_Two; | |
11292 | ||
3a3af4c3 AC |
11293 | ---------------------- |
11294 | -- Remove_Init_Call -- | |
11295 | ---------------------- | |
11296 | ||
11297 | function Remove_Init_Call | |
11298 | (Var : Entity_Id; | |
11299 | Rep_Clause : Node_Id) return Node_Id | |
11300 | is | |
11301 | Par : constant Node_Id := Parent (Var); | |
11302 | Typ : constant Entity_Id := Etype (Var); | |
11303 | ||
11304 | Init_Proc : Entity_Id; | |
11305 | -- Initialization procedure for Typ | |
11306 | ||
11307 | function Find_Init_Call_In_List (From : Node_Id) return Node_Id; | |
11308 | -- Look for init call for Var starting at From and scanning the | |
11309 | -- enclosing list until Rep_Clause or the end of the list is reached. | |
11310 | ||
11311 | ---------------------------- | |
11312 | -- Find_Init_Call_In_List -- | |
11313 | ---------------------------- | |
11314 | ||
11315 | function Find_Init_Call_In_List (From : Node_Id) return Node_Id is | |
11316 | Init_Call : Node_Id; | |
ae05cdd6 | 11317 | |
3a3af4c3 AC |
11318 | begin |
11319 | Init_Call := From; | |
3a3af4c3 AC |
11320 | while Present (Init_Call) and then Init_Call /= Rep_Clause loop |
11321 | if Nkind (Init_Call) = N_Procedure_Call_Statement | |
11322 | and then Is_Entity_Name (Name (Init_Call)) | |
11323 | and then Entity (Name (Init_Call)) = Init_Proc | |
11324 | then | |
11325 | return Init_Call; | |
11326 | end if; | |
11327 | ||
11328 | Next (Init_Call); | |
11329 | end loop; | |
11330 | ||
11331 | return Empty; | |
11332 | end Find_Init_Call_In_List; | |
11333 | ||
11334 | Init_Call : Node_Id; | |
11335 | ||
afab03da | 11336 | -- Start of processing for Remove_Init_Call |
3a3af4c3 AC |
11337 | |
11338 | begin | |
11339 | if Present (Initialization_Statements (Var)) then | |
11340 | Init_Call := Initialization_Statements (Var); | |
11341 | Set_Initialization_Statements (Var, Empty); | |
11342 | ||
11343 | elsif not Has_Non_Null_Base_Init_Proc (Typ) then | |
11344 | ||
11345 | -- No init proc for the type, so obviously no call to be found | |
11346 | ||
11347 | return Empty; | |
11348 | ||
11349 | else | |
11350 | -- We might be able to handle other cases below by just properly | |
11351 | -- setting Initialization_Statements at the point where the init proc | |
11352 | -- call is generated??? | |
11353 | ||
11354 | Init_Proc := Base_Init_Proc (Typ); | |
11355 | ||
11356 | -- First scan the list containing the declaration of Var | |
11357 | ||
11358 | Init_Call := Find_Init_Call_In_List (From => Next (Par)); | |
11359 | ||
11360 | -- If not found, also look on Var's freeze actions list, if any, | |
11361 | -- since the init call may have been moved there (case of an address | |
11362 | -- clause applying to Var). | |
11363 | ||
11364 | if No (Init_Call) and then Present (Freeze_Node (Var)) then | |
11365 | Init_Call := | |
11366 | Find_Init_Call_In_List (First (Actions (Freeze_Node (Var)))); | |
11367 | end if; | |
11368 | ||
11369 | -- If the initialization call has actuals that use the secondary | |
11370 | -- stack, the call may have been wrapped into a temporary block, in | |
11371 | -- which case the block itself has to be removed. | |
11372 | ||
11373 | if No (Init_Call) and then Nkind (Next (Par)) = N_Block_Statement then | |
11374 | declare | |
11375 | Blk : constant Node_Id := Next (Par); | |
11376 | begin | |
11377 | if Present | |
11378 | (Find_Init_Call_In_List | |
11379 | (First (Statements (Handled_Statement_Sequence (Blk))))) | |
11380 | then | |
11381 | Init_Call := Blk; | |
11382 | end if; | |
11383 | end; | |
11384 | end if; | |
11385 | end if; | |
11386 | ||
11387 | if Present (Init_Call) then | |
4b0ba356 ES |
11388 | -- If restrictions have forbidden Aborts, the initialization call |
11389 | -- for objects that require deep initialization has not been wrapped | |
11390 | -- into the following block (see Exp_Ch3, Default_Initialize_Object) | |
11391 | -- so if present remove it as well, and include the IP call in it, | |
11392 | -- in the rare case the caller may need to simply displace the | |
11393 | -- initialization, as is done for a later address specification. | |
11394 | ||
11395 | if Nkind (Next (Init_Call)) = N_Block_Statement | |
11396 | and then Is_Initialization_Block (Next (Init_Call)) | |
11397 | then | |
11398 | declare | |
11399 | IP_Call : constant Node_Id := Init_Call; | |
11400 | begin | |
11401 | Init_Call := Next (IP_Call); | |
11402 | Remove (IP_Call); | |
11403 | Prepend (IP_Call, | |
11404 | Statements (Handled_Statement_Sequence (Init_Call))); | |
11405 | end; | |
11406 | end if; | |
11407 | ||
3a3af4c3 AC |
11408 | Remove (Init_Call); |
11409 | end if; | |
afab03da | 11410 | |
3a3af4c3 AC |
11411 | return Init_Call; |
11412 | end Remove_Init_Call; | |
11413 | ||
70482933 RK |
11414 | ------------------------- |
11415 | -- Remove_Side_Effects -- | |
11416 | ------------------------- | |
11417 | ||
11418 | procedure Remove_Side_Effects | |
89d3b1a1 AC |
11419 | (Exp : Node_Id; |
11420 | Name_Req : Boolean := False; | |
11421 | Renaming_Req : Boolean := False; | |
11422 | Variable_Ref : Boolean := False; | |
11423 | Related_Id : Entity_Id := Empty; | |
11424 | Is_Low_Bound : Boolean := False; | |
11425 | Is_High_Bound : Boolean := False; | |
11426 | Check_Side_Effects : Boolean := True) | |
70482933 | 11427 | is |
2934b84a AC |
11428 | function Build_Temporary |
11429 | (Loc : Source_Ptr; | |
11430 | Id : Character; | |
11431 | Related_Nod : Node_Id := Empty) return Entity_Id; | |
09edc2c2 AC |
11432 | -- Create an external symbol of the form xxx_FIRST/_LAST if Related_Nod |
11433 | -- is present (xxx is taken from the Chars field of Related_Nod), | |
8f8f531f PMR |
11434 | -- otherwise it generates an internal temporary. The created temporary |
11435 | -- entity is marked as internal. | |
2934b84a | 11436 | |
a6fecb06 | 11437 | function Possible_Side_Effect_In_SPARK (Exp : Node_Id) return Boolean; |
595c9aeb | 11438 | -- Computes whether a side effect is possible in SPARK, which should |
a6fecb06 | 11439 | -- be handled by removing it from the expression for GNATprove. Note |
595c9aeb | 11440 | -- that other side effects related to volatile variables are handled |
a6fecb06 YM |
11441 | -- separately. |
11442 | ||
2934b84a AC |
11443 | --------------------- |
11444 | -- Build_Temporary -- | |
11445 | --------------------- | |
11446 | ||
11447 | function Build_Temporary | |
11448 | (Loc : Source_Ptr; | |
11449 | Id : Character; | |
11450 | Related_Nod : Node_Id := Empty) return Entity_Id | |
11451 | is | |
8f8f531f | 11452 | Temp_Id : Entity_Id; |
8ce62196 | 11453 | Temp_Nam : Name_Id; |
2934b84a AC |
11454 | |
11455 | begin | |
11456 | -- The context requires an external symbol | |
11457 | ||
11458 | if Present (Related_Id) then | |
11459 | if Is_Low_Bound then | |
11460 | Temp_Nam := New_External_Name (Chars (Related_Id), "_FIRST"); | |
11461 | else pragma Assert (Is_High_Bound); | |
11462 | Temp_Nam := New_External_Name (Chars (Related_Id), "_LAST"); | |
11463 | end if; | |
11464 | ||
8f8f531f | 11465 | Temp_Id := Make_Defining_Identifier (Loc, Temp_Nam); |
2934b84a AC |
11466 | |
11467 | -- Otherwise generate an internal temporary | |
11468 | ||
11469 | else | |
8f8f531f | 11470 | Temp_Id := Make_Temporary (Loc, Id, Related_Nod); |
2934b84a | 11471 | end if; |
8f8f531f PMR |
11472 | |
11473 | Set_Is_Internal (Temp_Id); | |
11474 | ||
11475 | return Temp_Id; | |
2934b84a AC |
11476 | end Build_Temporary; |
11477 | ||
a6fecb06 YM |
11478 | ----------------------------------- |
11479 | -- Possible_Side_Effect_In_SPARK -- | |
11480 | ----------------------------------- | |
11481 | ||
11482 | function Possible_Side_Effect_In_SPARK (Exp : Node_Id) return Boolean is | |
11483 | begin | |
11484 | -- Side-effect removal in SPARK should only occur when not inside a | |
11485 | -- generic and not doing a preanalysis, inside an object renaming or | |
11486 | -- a type declaration or a for-loop iteration scheme. | |
11487 | ||
11488 | return not Inside_A_Generic | |
11489 | and then Full_Analysis | |
11490 | and then Nkind (Enclosing_Declaration (Exp)) in | |
11491 | N_Full_Type_Declaration | |
11492 | | N_Iterator_Specification | |
11493 | | N_Loop_Parameter_Specification | |
11494 | | N_Object_Renaming_Declaration | |
11495 | | N_Subtype_Declaration; | |
11496 | end Possible_Side_Effect_In_SPARK; | |
11497 | ||
2934b84a AC |
11498 | -- Local variables |
11499 | ||
3217f71e AC |
11500 | Loc : constant Source_Ptr := Sloc (Exp); |
11501 | Exp_Type : constant Entity_Id := Etype (Exp); | |
11502 | Svg_Suppress : constant Suppress_Record := Scope_Suppress; | |
70482933 | 11503 | Def_Id : Entity_Id; |
cc570be6 AC |
11504 | E : Node_Id; |
11505 | New_Exp : Node_Id; | |
11506 | Ptr_Typ_Decl : Node_Id; | |
70482933 RK |
11507 | Ref_Type : Entity_Id; |
11508 | Res : Node_Id; | |
70482933 | 11509 | |
2934b84a AC |
11510 | -- Start of processing for Remove_Side_Effects |
11511 | ||
70482933 | 11512 | begin |
f5da7a97 YM |
11513 | -- Handle cases in which there is nothing to do. In GNATprove mode, |
11514 | -- removal of side effects is useful for the light expansion of | |
a6fecb06 | 11515 | -- renamings. |
c269a1f5 | 11516 | |
a6ce7e76 | 11517 | if not Expander_Active |
a6fecb06 YM |
11518 | and then not |
11519 | (GNATprove_Mode and then Possible_Side_Effect_In_SPARK (Exp)) | |
a6ce7e76 | 11520 | then |
cae81f17 JM |
11521 | return; |
11522 | ||
11523 | -- Cannot generate temporaries if the invocation to remove side effects | |
11524 | -- was issued too early and the type of the expression is not resolved | |
11525 | -- (this happens because routines Duplicate_Subexpr_XX implicitly invoke | |
11526 | -- Remove_Side_Effects). | |
11527 | ||
10edebe7 AC |
11528 | elsif No (Exp_Type) |
11529 | or else Ekind (Exp_Type) = E_Access_Attribute_Type | |
11530 | then | |
11531 | return; | |
11532 | ||
11533 | -- Nothing to do if prior expansion determined that a function call does | |
11534 | -- not require side effect removal. | |
11535 | ||
11536 | elsif Nkind (Exp) = N_Function_Call | |
11537 | and then No_Side_Effect_Removal (Exp) | |
11538 | then | |
cae81f17 JM |
11539 | return; |
11540 | ||
11541 | -- No action needed for side-effect free expressions | |
70482933 | 11542 | |
89d3b1a1 AC |
11543 | elsif Check_Side_Effects |
11544 | and then Side_Effect_Free (Exp, Name_Req, Variable_Ref) | |
11545 | then | |
70482933 | 11546 | return; |
78cac738 JM |
11547 | |
11548 | -- Generating C code we cannot remove side effect of function returning | |
11549 | -- class-wide types since there is no secondary stack (required to use | |
11550 | -- 'reference). | |
11551 | ||
11552 | elsif Modify_Tree_For_C | |
11553 | and then Nkind (Exp) = N_Function_Call | |
11554 | and then Is_Class_Wide_Type (Etype (Exp)) | |
11555 | then | |
11556 | return; | |
70482933 RK |
11557 | end if; |
11558 | ||
22e89283 | 11559 | -- The remaining processing is done with all checks suppressed |
67b8ac46 AC |
11560 | |
11561 | -- Note: from now on, don't use return statements, instead do a goto | |
11562 | -- Leave, to ensure that we properly restore Scope_Suppress.Suppress. | |
70482933 | 11563 | |
a7f1b24f | 11564 | Scope_Suppress.Suppress := (others => True); |
70482933 | 11565 | |
cf9e3829 EB |
11566 | -- If this is a side-effect free attribute reference whose expressions |
11567 | -- are also side-effect free and whose prefix is not a name, remove the | |
11568 | -- side effects of the prefix. A copy of the prefix is required in this | |
11569 | -- case and it is better not to make an additional one for the attribute | |
11570 | -- itself, because the return type of many of them is universal integer, | |
11571 | -- which is a very large type for a temporary. | |
11572 | ||
11573 | if Nkind (Exp) = N_Attribute_Reference | |
11574 | and then Side_Effect_Free_Attribute (Attribute_Name (Exp)) | |
11575 | and then Side_Effect_Free (Expressions (Exp), Name_Req, Variable_Ref) | |
11576 | and then not Is_Name_Reference (Prefix (Exp)) | |
11577 | then | |
11578 | Remove_Side_Effects (Prefix (Exp), Name_Req, Variable_Ref); | |
11579 | goto Leave; | |
11580 | ||
67cc7a30 | 11581 | -- If this is an elementary or a small not-by-reference record type, and |
34da9c98 EB |
11582 | -- we need to capture the value, just make a constant; this is cheap and |
11583 | -- objects of both kinds of types can be bit aligned, so it might not be | |
11584 | -- possible to generate a reference to them. Likewise if this is not a | |
67cc7a30 | 11585 | -- name reference, except for a type conversion, because we would enter |
34da9c98 EB |
11586 | -- an infinite recursion with Checks.Apply_Predicate_Check if the target |
11587 | -- type has predicates (and type conversions need a specific treatment | |
11588 | -- anyway, see below). Also do it if we have a volatile reference and | |
11589 | -- Name_Req is not set (see comments for Side_Effect_Free). | |
11590 | ||
cf9e3829 EB |
11591 | elsif (Is_Elementary_Type (Exp_Type) |
11592 | or else (Is_Record_Type (Exp_Type) | |
11593 | and then Known_Static_RM_Size (Exp_Type) | |
c7c7dd3a | 11594 | and then RM_Size (Exp_Type) <= System_Max_Integer_Size |
cf9e3829 EB |
11595 | and then not Has_Discriminants (Exp_Type) |
11596 | and then not Is_By_Reference_Type (Exp_Type))) | |
d9e0a587 | 11597 | and then (Variable_Ref |
22e89283 AC |
11598 | or else (not Is_Name_Reference (Exp) |
11599 | and then Nkind (Exp) /= N_Type_Conversion) | |
365c8496 RD |
11600 | or else (not Name_Req |
11601 | and then Is_Volatile_Reference (Exp))) | |
d9e0a587 | 11602 | then |
2934b84a | 11603 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
d9e0a587 | 11604 | Set_Etype (Def_Id, Exp_Type); |
e4494292 | 11605 | Res := New_Occurrence_Of (Def_Id, Loc); |
d9e0a587 | 11606 | |
273adcdf AC |
11607 | -- If the expression is a packed reference, it must be reanalyzed and |
11608 | -- expanded, depending on context. This is the case for actuals where | |
11609 | -- a constraint check may capture the actual before expansion of the | |
11610 | -- call is complete. | |
8cce3d75 AC |
11611 | |
11612 | if Nkind (Exp) = N_Indexed_Component | |
11613 | and then Is_Packed (Etype (Prefix (Exp))) | |
11614 | then | |
11615 | Set_Analyzed (Exp, False); | |
11616 | Set_Analyzed (Prefix (Exp), False); | |
11617 | end if; | |
11618 | ||
a43f6434 AC |
11619 | -- Generate: |
11620 | -- Rnn : Exp_Type renames Expr; | |
11621 | ||
e9427de1 YM |
11622 | -- In GNATprove mode, we prefer to use renamings for intermediate |
11623 | -- variables to definition of constants, due to the implicit move | |
11624 | -- operation that such a constant definition causes as part of the | |
3f833dc2 GD |
11625 | -- support in GNATprove for ownership pointers. Hence, we generate |
11626 | -- a renaming for a reference to an object of a nonscalar type. | |
e9427de1 YM |
11627 | |
11628 | if Renaming_Req | |
11629 | or else (GNATprove_Mode | |
11630 | and then Is_Object_Reference (Exp) | |
11631 | and then not Is_Scalar_Type (Exp_Type)) | |
11632 | then | |
a43f6434 AC |
11633 | E := |
11634 | Make_Object_Renaming_Declaration (Loc, | |
11635 | Defining_Identifier => Def_Id, | |
11636 | Subtype_Mark => New_Occurrence_Of (Exp_Type, Loc), | |
11637 | Name => Relocate_Node (Exp)); | |
11638 | ||
11639 | -- Generate: | |
11640 | -- Rnn : constant Exp_Type := Expr; | |
11641 | ||
11642 | else | |
11643 | E := | |
11644 | Make_Object_Declaration (Loc, | |
11645 | Defining_Identifier => Def_Id, | |
11646 | Object_Definition => New_Occurrence_Of (Exp_Type, Loc), | |
11647 | Constant_Present => True, | |
11648 | Expression => Relocate_Node (Exp)); | |
11649 | ||
11650 | Set_Assignment_OK (E); | |
11651 | end if; | |
d9e0a587 | 11652 | |
d9e0a587 EB |
11653 | Insert_Action (Exp, E); |
11654 | ||
273adcdf | 11655 | -- If the expression has the form v.all then we can just capture the |
bb012790 AC |
11656 | -- pointer, and then do an explicit dereference on the result, but |
11657 | -- this is not right if this is a volatile reference. | |
70482933 | 11658 | |
bb012790 AC |
11659 | elsif Nkind (Exp) = N_Explicit_Dereference |
11660 | and then not Is_Volatile_Reference (Exp) | |
11661 | then | |
2934b84a | 11662 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
70482933 | 11663 | Res := |
e4494292 | 11664 | Make_Explicit_Dereference (Loc, New_Occurrence_Of (Def_Id, Loc)); |
70482933 RK |
11665 | |
11666 | Insert_Action (Exp, | |
11667 | Make_Object_Declaration (Loc, | |
11668 | Defining_Identifier => Def_Id, | |
11669 | Object_Definition => | |
e4494292 | 11670 | New_Occurrence_Of (Etype (Prefix (Exp)), Loc), |
70482933 RK |
11671 | Constant_Present => True, |
11672 | Expression => Relocate_Node (Prefix (Exp)))); | |
11673 | ||
273adcdf AC |
11674 | -- Similar processing for an unchecked conversion of an expression of |
11675 | -- the form v.all, where we want the same kind of treatment. | |
fbf5a39b AC |
11676 | |
11677 | elsif Nkind (Exp) = N_Unchecked_Type_Conversion | |
11678 | and then Nkind (Expression (Exp)) = N_Explicit_Dereference | |
11679 | then | |
8adcacef | 11680 | Remove_Side_Effects (Expression (Exp), Name_Req, Variable_Ref); |
67b8ac46 | 11681 | goto Leave; |
fbf5a39b | 11682 | |
70482933 | 11683 | -- If this is a type conversion, leave the type conversion and remove |
e4542648 EB |
11684 | -- side effects in the expression, unless it is of universal integer, |
11685 | -- which is a very large type for a temporary. This is important in | |
11686 | -- several circumstances: for change of representations and also when | |
11687 | -- this is a view conversion to a smaller object, where gigi can end | |
11688 | -- up creating its own temporary of the wrong size. | |
11689 | ||
11690 | elsif Nkind (Exp) = N_Type_Conversion | |
11691 | and then Etype (Expression (Exp)) /= Universal_Integer | |
11692 | then | |
8adcacef | 11693 | Remove_Side_Effects (Expression (Exp), Name_Req, Variable_Ref); |
6905a049 AC |
11694 | |
11695 | -- Generating C code the type conversion of an access to constrained | |
11696 | -- array type into an access to unconstrained array type involves | |
11697 | -- initializing a fat pointer and the expression must be free of | |
11698 | -- side effects to safely compute its bounds. | |
11699 | ||
c63a2ad6 | 11700 | if Modify_Tree_For_C |
6905a049 AC |
11701 | and then Is_Access_Type (Etype (Exp)) |
11702 | and then Is_Array_Type (Designated_Type (Etype (Exp))) | |
11703 | and then not Is_Constrained (Designated_Type (Etype (Exp))) | |
11704 | then | |
11705 | Def_Id := Build_Temporary (Loc, 'R', Exp); | |
11706 | Set_Etype (Def_Id, Exp_Type); | |
11707 | Res := New_Occurrence_Of (Def_Id, Loc); | |
11708 | ||
11709 | Insert_Action (Exp, | |
11710 | Make_Object_Declaration (Loc, | |
11711 | Defining_Identifier => Def_Id, | |
11712 | Object_Definition => New_Occurrence_Of (Exp_Type, Loc), | |
11713 | Constant_Present => True, | |
11714 | Expression => Relocate_Node (Exp))); | |
11715 | else | |
11716 | goto Leave; | |
11717 | end if; | |
70482933 | 11718 | |
d9e0a587 EB |
11719 | -- If this is an unchecked conversion that Gigi can't handle, make |
11720 | -- a copy or a use a renaming to capture the value. | |
11721 | ||
11722 | elsif Nkind (Exp) = N_Unchecked_Type_Conversion | |
11723 | and then not Safe_Unchecked_Type_Conversion (Exp) | |
11724 | then | |
048e5cef | 11725 | if CW_Or_Has_Controlled_Part (Exp_Type) then |
d9e0a587 EB |
11726 | |
11727 | -- Use a renaming to capture the expression, rather than create | |
11728 | -- a controlled temporary. | |
11729 | ||
2934b84a AC |
11730 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
11731 | Res := New_Occurrence_Of (Def_Id, Loc); | |
d9e0a587 EB |
11732 | |
11733 | Insert_Action (Exp, | |
11734 | Make_Object_Renaming_Declaration (Loc, | |
11735 | Defining_Identifier => Def_Id, | |
e4494292 | 11736 | Subtype_Mark => New_Occurrence_Of (Exp_Type, Loc), |
d9e0a587 EB |
11737 | Name => Relocate_Node (Exp))); |
11738 | ||
11739 | else | |
2934b84a | 11740 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
d9e0a587 | 11741 | Set_Etype (Def_Id, Exp_Type); |
2934b84a | 11742 | Res := New_Occurrence_Of (Def_Id, Loc); |
d9e0a587 EB |
11743 | |
11744 | E := | |
11745 | Make_Object_Declaration (Loc, | |
11746 | Defining_Identifier => Def_Id, | |
e4494292 | 11747 | Object_Definition => New_Occurrence_Of (Exp_Type, Loc), |
d9e0a587 EB |
11748 | Constant_Present => not Is_Variable (Exp), |
11749 | Expression => Relocate_Node (Exp)); | |
11750 | ||
11751 | Set_Assignment_OK (E); | |
11752 | Insert_Action (Exp, E); | |
11753 | end if; | |
11754 | ||
1b93e420 EB |
11755 | -- If this is a packed array component or a selected component with a |
11756 | -- nonstandard representation, we cannot generate a reference because | |
11757 | -- the component may be unaligned, so we must use a renaming and this | |
a36a2913 EB |
11758 | -- renaming is handled by the front end, as the back end may balk at |
11759 | -- the nonstandard representation (see Evaluation_Required in Exp_Ch8). | |
1b93e420 EB |
11760 | |
11761 | elsif Nkind (Exp) in N_Indexed_Component | N_Selected_Component | |
11762 | and then Has_Non_Standard_Rep (Etype (Prefix (Exp))) | |
11763 | then | |
11764 | Def_Id := Build_Temporary (Loc, 'R', Exp); | |
11765 | Res := New_Occurrence_Of (Def_Id, Loc); | |
11766 | ||
11767 | Insert_Action (Exp, | |
11768 | Make_Object_Renaming_Declaration (Loc, | |
11769 | Defining_Identifier => Def_Id, | |
11770 | Subtype_Mark => New_Occurrence_Of (Exp_Type, Loc), | |
11771 | Name => Relocate_Node (Exp))); | |
11772 | ||
a36a2913 | 11773 | -- For an expression that denotes a name, we can use a renaming scheme. |
18a2ad5d | 11774 | -- This is needed for correctness in the case of a volatile object of |
3f833dc2 | 11775 | -- a nonvolatile type because the Make_Reference call of the "default" |
273adcdf | 11776 | -- approach would generate an illegal access value (an access value |
bb012790 | 11777 | -- cannot designate such an object - see Analyze_Reference). |
18a2ad5d | 11778 | |
22e89283 | 11779 | elsif Is_Name_Reference (Exp) |
bb012790 AC |
11780 | |
11781 | -- We skip using this scheme if we have an object of a volatile | |
11782 | -- type and we do not have Name_Req set true (see comments for | |
11783 | -- Side_Effect_Free). | |
11784 | ||
676e8420 | 11785 | and then (Name_Req or else not Treat_As_Volatile (Exp_Type)) |
70482933 | 11786 | then |
2934b84a | 11787 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
22e89283 | 11788 | Res := New_Occurrence_Of (Def_Id, Loc); |
70482933 | 11789 | |
22e89283 AC |
11790 | Insert_Action (Exp, |
11791 | Make_Object_Renaming_Declaration (Loc, | |
11792 | Defining_Identifier => Def_Id, | |
11793 | Subtype_Mark => New_Occurrence_Of (Exp_Type, Loc), | |
11794 | Name => Relocate_Node (Exp))); | |
70482933 | 11795 | |
22e89283 AC |
11796 | -- Avoid generating a variable-sized temporary, by generating the |
11797 | -- reference just for the function call. The transformation could be | |
11798 | -- refined to apply only when the array component is constrained by a | |
11799 | -- discriminant??? | |
11800 | ||
11801 | elsif Nkind (Exp) = N_Selected_Component | |
11802 | and then Nkind (Prefix (Exp)) = N_Function_Call | |
11803 | and then Is_Array_Type (Exp_Type) | |
11804 | then | |
11805 | Remove_Side_Effects (Prefix (Exp), Name_Req, Variable_Ref); | |
11806 | goto Leave; | |
11807 | ||
11808 | -- Otherwise we generate a reference to the expression | |
70482933 RK |
11809 | |
11810 | else | |
c7518e6f AC |
11811 | -- When generating C code we cannot consider side effect free object |
11812 | -- declarations that have discriminants and are initialized by means | |
11813 | -- of a function call since on this target there is no secondary | |
11814 | -- stack to store the return value and the expander may generate an | |
11815 | -- extra call to the function to compute the discriminant value. In | |
11816 | -- addition, for targets that have secondary stack, the expansion of | |
11817 | -- functions with side effects involves the generation of an access | |
11818 | -- type to capture the return value stored in the secondary stack; | |
11819 | -- by contrast when generating C code such expansion generates an | |
11820 | -- internal object declaration (no access type involved) which must | |
11821 | -- be identified here to avoid entering into a never-ending loop | |
11822 | -- generating internal object declarations. | |
11823 | ||
d43123ee | 11824 | if Modify_Tree_For_C |
c7518e6f AC |
11825 | and then Nkind (Parent (Exp)) = N_Object_Declaration |
11826 | and then | |
11827 | (Nkind (Exp) /= N_Function_Call | |
11828 | or else not Has_Discriminants (Exp_Type) | |
11829 | or else Is_Internal_Name | |
11830 | (Chars (Defining_Identifier (Parent (Exp))))) | |
11831 | then | |
11832 | goto Leave; | |
c269a1f5 AC |
11833 | end if; |
11834 | ||
01957849 AC |
11835 | -- Special processing for function calls that return a limited type. |
11836 | -- We need to build a declaration that will enable build-in-place | |
11837 | -- expansion of the call. This is not done if the context is already | |
11838 | -- an object declaration, to prevent infinite recursion. | |
65df5b71 HK |
11839 | |
11840 | -- This is relevant only in Ada 2005 mode. In Ada 95 programs we have | |
11841 | -- to accommodate functions returning limited objects by reference. | |
11842 | ||
cc570be6 AC |
11843 | if Ada_Version >= Ada_2005 |
11844 | and then Nkind (Exp) = N_Function_Call | |
51245e2d | 11845 | and then Is_Limited_View (Etype (Exp)) |
01957849 | 11846 | and then Nkind (Parent (Exp)) /= N_Object_Declaration |
65df5b71 HK |
11847 | then |
11848 | declare | |
faf387e1 | 11849 | Obj : constant Entity_Id := Make_Temporary (Loc, 'F', Exp); |
65df5b71 HK |
11850 | Decl : Node_Id; |
11851 | ||
11852 | begin | |
11853 | Decl := | |
11854 | Make_Object_Declaration (Loc, | |
11855 | Defining_Identifier => Obj, | |
11856 | Object_Definition => New_Occurrence_Of (Exp_Type, Loc), | |
11857 | Expression => Relocate_Node (Exp)); | |
327503f1 | 11858 | |
65df5b71 HK |
11859 | Insert_Action (Exp, Decl); |
11860 | Set_Etype (Obj, Exp_Type); | |
11861 | Rewrite (Exp, New_Occurrence_Of (Obj, Loc)); | |
67b8ac46 | 11862 | goto Leave; |
65df5b71 HK |
11863 | end; |
11864 | end if; | |
11865 | ||
2934b84a | 11866 | Def_Id := Build_Temporary (Loc, 'R', Exp); |
70482933 | 11867 | |
c269a1f5 AC |
11868 | -- The regular expansion of functions with side effects involves the |
11869 | -- generation of an access type to capture the return value found on | |
06b599fd | 11870 | -- the secondary stack. Since SPARK (and why) cannot process access |
c269a1f5 AC |
11871 | -- types, use a different approach which ignores the secondary stack |
11872 | -- and "copies" the returned object. | |
7b52257c AC |
11873 | -- When generating C code, no need for a 'reference since the |
11874 | -- secondary stack is not supported. | |
cc570be6 | 11875 | |
c63a2ad6 | 11876 | if GNATprove_Mode or Modify_Tree_For_C then |
e4494292 | 11877 | Res := New_Occurrence_Of (Def_Id, Loc); |
c269a1f5 AC |
11878 | Ref_Type := Exp_Type; |
11879 | ||
11880 | -- Regular expansion utilizing an access type and 'reference | |
cc570be6 | 11881 | |
c269a1f5 AC |
11882 | else |
11883 | Res := | |
11884 | Make_Explicit_Dereference (Loc, | |
e4494292 | 11885 | Prefix => New_Occurrence_Of (Def_Id, Loc)); |
b2ab8c33 | 11886 | |
c269a1f5 AC |
11887 | -- Generate: |
11888 | -- type Ann is access all <Exp_Type>; | |
cc570be6 | 11889 | |
c269a1f5 AC |
11890 | Ref_Type := Make_Temporary (Loc, 'A'); |
11891 | ||
11892 | Ptr_Typ_Decl := | |
11893 | Make_Full_Type_Declaration (Loc, | |
11894 | Defining_Identifier => Ref_Type, | |
11895 | Type_Definition => | |
11896 | Make_Access_To_Object_Definition (Loc, | |
11897 | All_Present => True, | |
11898 | Subtype_Indication => | |
e4494292 | 11899 | New_Occurrence_Of (Exp_Type, Loc))); |
c269a1f5 AC |
11900 | |
11901 | Insert_Action (Exp, Ptr_Typ_Decl); | |
11902 | end if; | |
cc570be6 AC |
11903 | |
11904 | E := Exp; | |
70482933 RK |
11905 | if Nkind (E) = N_Explicit_Dereference then |
11906 | New_Exp := Relocate_Node (Prefix (E)); | |
365c8496 | 11907 | |
70482933 RK |
11908 | else |
11909 | E := Relocate_Node (E); | |
cc570be6 | 11910 | |
7b52257c AC |
11911 | -- Do not generate a 'reference in SPARK mode or C generation |
11912 | -- since the access type is not created in the first place. | |
cc570be6 | 11913 | |
c63a2ad6 | 11914 | if GNATprove_Mode or Modify_Tree_For_C then |
cc570be6 | 11915 | New_Exp := E; |
03e1048e AC |
11916 | |
11917 | -- Otherwise generate reference, marking the value as non-null | |
11918 | -- since we know it cannot be null and we don't want a check. | |
11919 | ||
cc570be6 AC |
11920 | else |
11921 | New_Exp := Make_Reference (Loc, E); | |
74cab21a | 11922 | Set_Is_Known_Non_Null (Def_Id); |
cc570be6 | 11923 | end if; |
70482933 RK |
11924 | end if; |
11925 | ||
f44fe430 RD |
11926 | if Is_Delayed_Aggregate (E) then |
11927 | ||
11928 | -- The expansion of nested aggregates is delayed until the | |
11929 | -- enclosing aggregate is expanded. As aggregates are often | |
273adcdf AC |
11930 | -- qualified, the predicate applies to qualified expressions as |
11931 | -- well, indicating that the enclosing aggregate has not been | |
11932 | -- expanded yet. At this point the aggregate is part of a | |
11933 | -- stand-alone declaration, and must be fully expanded. | |
f44fe430 RD |
11934 | |
11935 | if Nkind (E) = N_Qualified_Expression then | |
11936 | Set_Expansion_Delayed (Expression (E), False); | |
11937 | Set_Analyzed (Expression (E), False); | |
11938 | else | |
11939 | Set_Expansion_Delayed (E, False); | |
11940 | end if; | |
11941 | ||
70482933 RK |
11942 | Set_Analyzed (E, False); |
11943 | end if; | |
11944 | ||
c7518e6f AC |
11945 | -- Generating C code of object declarations that have discriminants |
11946 | -- and are initialized by means of a function call we propagate the | |
11947 | -- discriminants of the parent type to the internally built object. | |
11948 | -- This is needed to avoid generating an extra call to the called | |
11949 | -- function. | |
11950 | ||
11951 | -- For example, if we generate here the following declaration, it | |
11952 | -- will be expanded later adding an extra call to evaluate the value | |
11953 | -- of the discriminant (needed to compute the size of the object). | |
11954 | -- | |
11955 | -- type Rec (D : Integer) is ... | |
11956 | -- Obj : constant Rec := SomeFunc; | |
11957 | ||
c63a2ad6 | 11958 | if Modify_Tree_For_C |
c7518e6f AC |
11959 | and then Nkind (Parent (Exp)) = N_Object_Declaration |
11960 | and then Has_Discriminants (Exp_Type) | |
11961 | and then Nkind (Exp) = N_Function_Call | |
11962 | then | |
11963 | Insert_Action (Exp, | |
11964 | Make_Object_Declaration (Loc, | |
11965 | Defining_Identifier => Def_Id, | |
11966 | Object_Definition => New_Copy_Tree | |
11967 | (Object_Definition (Parent (Exp))), | |
11968 | Constant_Present => True, | |
11969 | Expression => New_Exp)); | |
11970 | else | |
11971 | Insert_Action (Exp, | |
11972 | Make_Object_Declaration (Loc, | |
11973 | Defining_Identifier => Def_Id, | |
11974 | Object_Definition => New_Occurrence_Of (Ref_Type, Loc), | |
11975 | Constant_Present => True, | |
11976 | Expression => New_Exp)); | |
11977 | end if; | |
70482933 RK |
11978 | end if; |
11979 | ||
273adcdf AC |
11980 | -- Preserve the Assignment_OK flag in all copies, since at least one |
11981 | -- copy may be used in a context where this flag must be set (otherwise | |
11982 | -- why would the flag be set in the first place). | |
70482933 RK |
11983 | |
11984 | Set_Assignment_OK (Res, Assignment_OK (Exp)); | |
11985 | ||
134f52b9 | 11986 | -- Preserve the Do_Range_Check flag in all copies |
5da54433 JM |
11987 | |
11988 | Set_Do_Range_Check (Res, Do_Range_Check (Exp)); | |
11989 | ||
70482933 RK |
11990 | -- Finally rewrite the original expression and we are done |
11991 | ||
11992 | Rewrite (Exp, Res); | |
11993 | Analyze_And_Resolve (Exp, Exp_Type); | |
67b8ac46 AC |
11994 | |
11995 | <<Leave>> | |
70482933 RK |
11996 | Scope_Suppress := Svg_Suppress; |
11997 | end Remove_Side_Effects; | |
11998 | ||
b619c88e AC |
11999 | ------------------------ |
12000 | -- Replace_References -- | |
12001 | ------------------------ | |
12002 | ||
12003 | procedure Replace_References | |
12004 | (Expr : Node_Id; | |
12005 | Par_Typ : Entity_Id; | |
12006 | Deriv_Typ : Entity_Id; | |
12007 | Par_Obj : Entity_Id := Empty; | |
12008 | Deriv_Obj : Entity_Id := Empty) | |
12009 | is | |
12010 | function Is_Deriv_Obj_Ref (Ref : Node_Id) return Boolean; | |
12011 | -- Determine whether node Ref denotes some component of Deriv_Obj | |
12012 | ||
12013 | function Replace_Ref (Ref : Node_Id) return Traverse_Result; | |
12014 | -- Substitute a reference to an entity with the corresponding value | |
12015 | -- stored in table Type_Map. | |
12016 | ||
12017 | function Type_Of_Formal | |
12018 | (Call : Node_Id; | |
12019 | Actual : Node_Id) return Entity_Id; | |
12020 | -- Find the type of the formal parameter which corresponds to actual | |
12021 | -- parameter Actual in subprogram call Call. | |
12022 | ||
12023 | ---------------------- | |
12024 | -- Is_Deriv_Obj_Ref -- | |
12025 | ---------------------- | |
12026 | ||
12027 | function Is_Deriv_Obj_Ref (Ref : Node_Id) return Boolean is | |
12028 | Par : constant Node_Id := Parent (Ref); | |
12029 | ||
12030 | begin | |
12031 | -- Detect the folowing selected component form: | |
12032 | ||
12033 | -- Deriv_Obj.(something) | |
12034 | ||
12035 | return | |
12036 | Nkind (Par) = N_Selected_Component | |
12037 | and then Is_Entity_Name (Prefix (Par)) | |
12038 | and then Entity (Prefix (Par)) = Deriv_Obj; | |
12039 | end Is_Deriv_Obj_Ref; | |
12040 | ||
12041 | ----------------- | |
12042 | -- Replace_Ref -- | |
12043 | ----------------- | |
12044 | ||
12045 | function Replace_Ref (Ref : Node_Id) return Traverse_Result is | |
b554177a | 12046 | procedure Remove_Controlling_Arguments (From_Arg : Node_Id); |
ca0b6141 | 12047 | -- Reset the Controlling_Argument of all function calls that |
b554177a AC |
12048 | -- encapsulate node From_Arg. |
12049 | ||
12050 | ---------------------------------- | |
12051 | -- Remove_Controlling_Arguments -- | |
12052 | ---------------------------------- | |
12053 | ||
12054 | procedure Remove_Controlling_Arguments (From_Arg : Node_Id) is | |
12055 | Par : Node_Id; | |
12056 | ||
12057 | begin | |
12058 | Par := From_Arg; | |
12059 | while Present (Par) loop | |
12060 | if Nkind (Par) = N_Function_Call | |
12061 | and then Present (Controlling_Argument (Par)) | |
12062 | then | |
12063 | Set_Controlling_Argument (Par, Empty); | |
12064 | ||
12065 | -- Prevent the search from going too far | |
12066 | ||
12067 | elsif Is_Body_Or_Package_Declaration (Par) then | |
12068 | exit; | |
12069 | end if; | |
12070 | ||
12071 | Par := Parent (Par); | |
12072 | end loop; | |
12073 | end Remove_Controlling_Arguments; | |
12074 | ||
12075 | -- Local variables | |
12076 | ||
b619c88e AC |
12077 | Context : constant Node_Id := Parent (Ref); |
12078 | Loc : constant Source_Ptr := Sloc (Ref); | |
12079 | Ref_Id : Entity_Id; | |
12080 | Result : Traverse_Result; | |
12081 | ||
12082 | New_Ref : Node_Id; | |
12083 | -- The new reference which is intended to substitute the old one | |
12084 | ||
12085 | Old_Ref : Node_Id; | |
12086 | -- The reference designated for replacement. In certain cases this | |
12087 | -- may be a node other than Ref. | |
12088 | ||
12089 | Val : Node_Or_Entity_Id; | |
12090 | -- The corresponding value of Ref from the type map | |
12091 | ||
b554177a AC |
12092 | -- Start of processing for Replace_Ref |
12093 | ||
b619c88e AC |
12094 | begin |
12095 | -- Assume that the input reference is to be replaced and that the | |
12096 | -- traversal should examine the children of the reference. | |
12097 | ||
12098 | Old_Ref := Ref; | |
12099 | Result := OK; | |
12100 | ||
12101 | -- The input denotes a meaningful reference | |
12102 | ||
12103 | if Nkind (Ref) in N_Has_Entity and then Present (Entity (Ref)) then | |
12104 | Ref_Id := Entity (Ref); | |
12105 | Val := Type_Map.Get (Ref_Id); | |
12106 | ||
12107 | -- The reference has a corresponding value in the type map, a | |
12108 | -- substitution is possible. | |
12109 | ||
12110 | if Present (Val) then | |
12111 | ||
12112 | -- The reference denotes a discriminant | |
12113 | ||
12114 | if Ekind (Ref_Id) = E_Discriminant then | |
12115 | if Nkind (Val) in N_Entity then | |
12116 | ||
12117 | -- The value denotes another discriminant. Replace as | |
12118 | -- follows: | |
12119 | ||
12120 | -- _object.Discr -> _object.Val | |
12121 | ||
12122 | if Ekind (Val) = E_Discriminant then | |
12123 | New_Ref := New_Occurrence_Of (Val, Loc); | |
12124 | ||
12125 | -- Otherwise the value denotes the entity of a name which | |
12126 | -- constraints the discriminant. Replace as follows: | |
12127 | ||
12128 | -- _object.Discr -> Val | |
12129 | ||
12130 | else | |
12131 | pragma Assert (Is_Deriv_Obj_Ref (Old_Ref)); | |
12132 | ||
12133 | New_Ref := New_Occurrence_Of (Val, Loc); | |
12134 | Old_Ref := Parent (Old_Ref); | |
12135 | end if; | |
12136 | ||
12137 | -- Otherwise the value denotes an arbitrary expression which | |
12138 | -- constraints the discriminant. Replace as follows: | |
12139 | ||
12140 | -- _object.Discr -> Val | |
12141 | ||
12142 | else | |
12143 | pragma Assert (Is_Deriv_Obj_Ref (Old_Ref)); | |
12144 | ||
12145 | New_Ref := New_Copy_Tree (Val); | |
12146 | Old_Ref := Parent (Old_Ref); | |
12147 | end if; | |
12148 | ||
12149 | -- Otherwise the reference denotes a primitive. Replace as | |
12150 | -- follows: | |
12151 | ||
12152 | -- Primitive -> Val | |
12153 | ||
12154 | else | |
12155 | pragma Assert (Nkind (Val) in N_Entity); | |
12156 | New_Ref := New_Occurrence_Of (Val, Loc); | |
12157 | end if; | |
12158 | ||
12159 | -- The reference mentions the _object parameter of the parent | |
b554177a | 12160 | -- type's DIC or type invariant procedure. Replace as follows: |
b619c88e AC |
12161 | |
12162 | -- _object -> _object | |
12163 | ||
12164 | elsif Present (Par_Obj) | |
12165 | and then Present (Deriv_Obj) | |
12166 | and then Ref_Id = Par_Obj | |
12167 | then | |
12168 | New_Ref := New_Occurrence_Of (Deriv_Obj, Loc); | |
12169 | ||
b554177a | 12170 | -- The type of the _object parameter is class-wide when the |
ca0b6141 | 12171 | -- expression comes from an assertion pragma that applies to |
b554177a AC |
12172 | -- an abstract parent type or an interface. The class-wide type |
12173 | -- facilitates the preanalysis of the expression by treating | |
ca0b6141 | 12174 | -- calls to abstract primitives that mention the current |
b554177a AC |
12175 | -- instance of the type as dispatching. Once the calls are |
12176 | -- remapped to invoke overriding or inherited primitives, the | |
12177 | -- calls no longer need to be dispatching. Examine all function | |
ca0b6141 | 12178 | -- calls that encapsulate the _object parameter and reset their |
b554177a AC |
12179 | -- Controlling_Argument attribute. |
12180 | ||
12181 | if Is_Class_Wide_Type (Etype (Par_Obj)) | |
12182 | and then Is_Abstract_Type (Root_Type (Etype (Par_Obj))) | |
12183 | then | |
12184 | Remove_Controlling_Arguments (Old_Ref); | |
12185 | end if; | |
12186 | ||
b619c88e AC |
12187 | -- The reference to _object acts as an actual parameter in a |
12188 | -- subprogram call which may be invoking a primitive of the | |
12189 | -- parent type: | |
12190 | ||
12191 | -- Primitive (... _object ...); | |
12192 | ||
12193 | -- The parent type primitive may not be overridden nor | |
12194 | -- inherited when it is declared after the derived type | |
12195 | -- definition: | |
12196 | ||
12197 | -- type Parent is tagged private; | |
12198 | -- type Child is new Parent with private; | |
12199 | -- procedure Primitive (Obj : Parent); | |
12200 | ||
12201 | -- In this scenario the _object parameter is converted to the | |
12202 | -- parent type. Due to complications with partial/full views | |
12203 | -- and view swaps, the parent type is taken from the formal | |
12204 | -- parameter of the subprogram being called. | |
12205 | ||
612c48b1 | 12206 | if Nkind (Context) in N_Subprogram_Call |
b619c88e AC |
12207 | and then No (Type_Map.Get (Entity (Name (Context)))) |
12208 | then | |
76f9c7f4 BD |
12209 | declare |
12210 | -- We need to use the Original_Node of the callee, in | |
12211 | -- case it was already modified. Note that we are using | |
12212 | -- Traverse_Proc to walk the tree, and it is defined to | |
12213 | -- walk subtrees in an arbitrary order. | |
12214 | ||
12215 | Callee : constant Entity_Id := | |
12216 | Entity (Original_Node (Name (Context))); | |
12217 | begin | |
12218 | if No (Type_Map.Get (Callee)) then | |
12219 | New_Ref := | |
12220 | Convert_To | |
12221 | (Type_Of_Formal (Context, Old_Ref), New_Ref); | |
12222 | ||
12223 | -- Do not process the generated type conversion | |
12224 | -- because both the parent type and the derived type | |
12225 | -- are in the Type_Map table. This will clobber the | |
12226 | -- type conversion by resetting its subtype mark. | |
12227 | ||
12228 | Result := Skip; | |
12229 | end if; | |
12230 | end; | |
b619c88e AC |
12231 | end if; |
12232 | ||
12233 | -- Otherwise there is nothing to replace | |
12234 | ||
12235 | else | |
12236 | New_Ref := Empty; | |
12237 | end if; | |
12238 | ||
12239 | if Present (New_Ref) then | |
12240 | Rewrite (Old_Ref, New_Ref); | |
12241 | ||
12242 | -- Update the return type when the context of the reference | |
12243 | -- acts as the name of a function call. Note that the update | |
12244 | -- should not be performed when the reference appears as an | |
12245 | -- actual in the call. | |
12246 | ||
12247 | if Nkind (Context) = N_Function_Call | |
12248 | and then Name (Context) = Old_Ref | |
12249 | then | |
12250 | Set_Etype (Context, Etype (Val)); | |
12251 | end if; | |
12252 | end if; | |
12253 | end if; | |
12254 | ||
12255 | -- Reanalyze the reference due to potential replacements | |
12256 | ||
12257 | if Nkind (Old_Ref) in N_Has_Etype then | |
12258 | Set_Analyzed (Old_Ref, False); | |
12259 | end if; | |
12260 | ||
12261 | return Result; | |
12262 | end Replace_Ref; | |
12263 | ||
12264 | procedure Replace_Refs is new Traverse_Proc (Replace_Ref); | |
12265 | ||
12266 | -------------------- | |
12267 | -- Type_Of_Formal -- | |
12268 | -------------------- | |
12269 | ||
12270 | function Type_Of_Formal | |
12271 | (Call : Node_Id; | |
12272 | Actual : Node_Id) return Entity_Id | |
12273 | is | |
12274 | A : Node_Id; | |
12275 | F : Entity_Id; | |
12276 | ||
12277 | begin | |
12278 | -- Examine the list of actual and formal parameters in parallel | |
12279 | ||
12280 | A := First (Parameter_Associations (Call)); | |
12281 | F := First_Formal (Entity (Name (Call))); | |
12282 | while Present (A) and then Present (F) loop | |
12283 | if A = Actual then | |
12284 | return Etype (F); | |
12285 | end if; | |
12286 | ||
12287 | Next (A); | |
12288 | Next_Formal (F); | |
12289 | end loop; | |
12290 | ||
12291 | -- The actual parameter must always have a corresponding formal | |
12292 | ||
12293 | pragma Assert (False); | |
12294 | ||
12295 | return Empty; | |
12296 | end Type_Of_Formal; | |
12297 | ||
12298 | -- Start of processing for Replace_References | |
12299 | ||
12300 | begin | |
12301 | -- Map the attributes of the parent type to the proper corresponding | |
12302 | -- attributes of the derived type. | |
12303 | ||
12304 | Map_Types | |
12305 | (Parent_Type => Par_Typ, | |
12306 | Derived_Type => Deriv_Typ); | |
12307 | ||
12308 | -- Inspect the input expression and perform substitutions where | |
12309 | -- necessary. | |
12310 | ||
12311 | Replace_Refs (Expr); | |
12312 | end Replace_References; | |
12313 | ||
12314 | ----------------------------- | |
12315 | -- Replace_Type_References -- | |
12316 | ----------------------------- | |
12317 | ||
12318 | procedure Replace_Type_References | |
b554177a AC |
12319 | (Expr : Node_Id; |
12320 | Typ : Entity_Id; | |
12321 | Obj_Id : Entity_Id) | |
b619c88e AC |
12322 | is |
12323 | procedure Replace_Type_Ref (N : Node_Id); | |
12324 | -- Substitute a single reference of the current instance of type Typ | |
12325 | -- with a reference to Obj_Id. | |
12326 | ||
12327 | ---------------------- | |
12328 | -- Replace_Type_Ref -- | |
12329 | ---------------------- | |
12330 | ||
12331 | procedure Replace_Type_Ref (N : Node_Id) is | |
b619c88e AC |
12332 | begin |
12333 | -- Decorate the reference to Typ even though it may be rewritten | |
65f1ca2e AC |
12334 | -- further down. This is done so that routines which examine |
12335 | -- properties of the Original_Node have some semantic information. | |
b619c88e AC |
12336 | |
12337 | if Nkind (N) = N_Identifier then | |
12338 | Set_Entity (N, Typ); | |
12339 | Set_Etype (N, Typ); | |
12340 | ||
12341 | elsif Nkind (N) = N_Selected_Component then | |
12342 | Analyze (Prefix (N)); | |
12343 | Set_Entity (Selector_Name (N), Typ); | |
12344 | Set_Etype (Selector_Name (N), Typ); | |
12345 | end if; | |
12346 | ||
12347 | -- Perform the following substitution: | |
12348 | ||
b554177a | 12349 | -- Typ --> _object |
51148dda | 12350 | |
b554177a | 12351 | Rewrite (N, New_Occurrence_Of (Obj_Id, Sloc (N))); |
b619c88e AC |
12352 | Set_Comes_From_Source (N, True); |
12353 | end Replace_Type_Ref; | |
12354 | ||
12355 | procedure Replace_Type_Refs is | |
12356 | new Replace_Type_References_Generic (Replace_Type_Ref); | |
12357 | ||
12358 | -- Start of processing for Replace_Type_References | |
12359 | ||
12360 | begin | |
12361 | Replace_Type_Refs (Expr, Typ); | |
12362 | end Replace_Type_References; | |
12363 | ||
f44fe430 RD |
12364 | --------------------------- |
12365 | -- Represented_As_Scalar -- | |
12366 | --------------------------- | |
12367 | ||
12368 | function Represented_As_Scalar (T : Entity_Id) return Boolean is | |
12369 | UT : constant Entity_Id := Underlying_Type (T); | |
12370 | begin | |
12371 | return Is_Scalar_Type (UT) | |
12372 | or else (Is_Bit_Packed_Array (UT) | |
8ca597af | 12373 | and then Is_Scalar_Type (Packed_Array_Impl_Type (UT))); |
f44fe430 RD |
12374 | end Represented_As_Scalar; |
12375 | ||
87729e5a AC |
12376 | ------------------------------ |
12377 | -- Requires_Cleanup_Actions -- | |
12378 | ------------------------------ | |
12379 | ||
fcf848c4 AC |
12380 | function Requires_Cleanup_Actions |
12381 | (N : Node_Id; | |
12382 | Lib_Level : Boolean) return Boolean | |
12383 | is | |
5f44f0d4 | 12384 | At_Lib_Level : constant Boolean := |
4a08c95c AC |
12385 | Lib_Level |
12386 | and then Nkind (N) in N_Package_Body | N_Package_Specification; | |
fcf848c4 | 12387 | -- N is at the library level if the top-most context is a package and |
3f833dc2 | 12388 | -- the path taken to reach N does not include nonpackage constructs. |
87729e5a AC |
12389 | |
12390 | begin | |
12391 | case Nkind (N) is | |
d8f43ee6 HK |
12392 | when N_Accept_Statement |
12393 | | N_Block_Statement | |
12394 | | N_Entry_Body | |
12395 | | N_Package_Body | |
12396 | | N_Protected_Body | |
12397 | | N_Subprogram_Body | |
12398 | | N_Task_Body | |
12399 | => | |
87729e5a | 12400 | return |
c581c520 PMR |
12401 | Requires_Cleanup_Actions |
12402 | (L => Declarations (N), | |
12403 | Lib_Level => At_Lib_Level, | |
12404 | Nested_Constructs => True) | |
12405 | or else | |
12406 | (Present (Handled_Statement_Sequence (N)) | |
12407 | and then | |
12408 | Requires_Cleanup_Actions | |
12409 | (L => | |
12410 | Statements (Handled_Statement_Sequence (N)), | |
12411 | Lib_Level => At_Lib_Level, | |
12412 | Nested_Constructs => True)); | |
40c21e91 PMR |
12413 | |
12414 | -- Extended return statements are the same as the above, except that | |
12415 | -- there is no Declarations field. We do not want to clean up the | |
12416 | -- Return_Object_Declarations. | |
12417 | ||
12418 | when N_Extended_Return_Statement => | |
12419 | return | |
c581c520 PMR |
12420 | Present (Handled_Statement_Sequence (N)) |
12421 | and then Requires_Cleanup_Actions | |
12422 | (L => | |
12423 | Statements (Handled_Statement_Sequence (N)), | |
12424 | Lib_Level => At_Lib_Level, | |
12425 | Nested_Constructs => True); | |
87729e5a AC |
12426 | |
12427 | when N_Package_Specification => | |
12428 | return | |
c581c520 PMR |
12429 | Requires_Cleanup_Actions |
12430 | (L => Visible_Declarations (N), | |
12431 | Lib_Level => At_Lib_Level, | |
12432 | Nested_Constructs => True) | |
12433 | or else | |
12434 | Requires_Cleanup_Actions | |
12435 | (L => Private_Declarations (N), | |
12436 | Lib_Level => At_Lib_Level, | |
12437 | Nested_Constructs => True); | |
87729e5a | 12438 | |
d8f43ee6 | 12439 | when others => |
40c21e91 | 12440 | raise Program_Error; |
87729e5a AC |
12441 | end case; |
12442 | end Requires_Cleanup_Actions; | |
12443 | ||
12444 | ------------------------------ | |
12445 | -- Requires_Cleanup_Actions -- | |
12446 | ------------------------------ | |
12447 | ||
12448 | function Requires_Cleanup_Actions | |
2ba7e31e | 12449 | (L : List_Id; |
fcf848c4 | 12450 | Lib_Level : Boolean; |
2ba7e31e | 12451 | Nested_Constructs : Boolean) return Boolean |
87729e5a AC |
12452 | is |
12453 | Decl : Node_Id; | |
12454 | Expr : Node_Id; | |
12455 | Obj_Id : Entity_Id; | |
12456 | Obj_Typ : Entity_Id; | |
12457 | Pack_Id : Entity_Id; | |
12458 | Typ : Entity_Id; | |
12459 | ||
12460 | begin | |
a3d1ca01 | 12461 | if No (L) or else Is_Empty_List (L) then |
87729e5a AC |
12462 | return False; |
12463 | end if; | |
12464 | ||
12465 | Decl := First (L); | |
12466 | while Present (Decl) loop | |
12467 | ||
12468 | -- Library-level tagged types | |
12469 | ||
12470 | if Nkind (Decl) = N_Full_Type_Declaration then | |
12471 | Typ := Defining_Identifier (Decl); | |
12472 | ||
8636f52f HK |
12473 | -- Ignored Ghost types do not need any cleanup actions because |
12474 | -- they will not appear in the final tree. | |
12475 | ||
12476 | if Is_Ignored_Ghost_Entity (Typ) then | |
12477 | null; | |
12478 | ||
12479 | elsif Is_Tagged_Type (Typ) | |
87729e5a AC |
12480 | and then Is_Library_Level_Entity (Typ) |
12481 | and then Convention (Typ) = Convention_Ada | |
12482 | and then Present (Access_Disp_Table (Typ)) | |
12483 | and then RTE_Available (RE_Unregister_Tag) | |
87729e5a | 12484 | and then not Is_Abstract_Type (Typ) |
8636f52f | 12485 | and then not No_Run_Time_Mode |
87729e5a AC |
12486 | then |
12487 | return True; | |
12488 | end if; | |
12489 | ||
12490 | -- Regular object declarations | |
12491 | ||
12492 | elsif Nkind (Decl) = N_Object_Declaration then | |
12493 | Obj_Id := Defining_Identifier (Decl); | |
12494 | Obj_Typ := Base_Type (Etype (Obj_Id)); | |
12495 | Expr := Expression (Decl); | |
12496 | ||
12497 | -- Bypass any form of processing for objects which have their | |
12498 | -- finalization disabled. This applies only to objects at the | |
12499 | -- library level. | |
12500 | ||
fcf848c4 | 12501 | if Lib_Level and then Finalize_Storage_Only (Obj_Typ) then |
87729e5a AC |
12502 | null; |
12503 | ||
937e9676 AC |
12504 | -- Finalization of transient objects are treated separately in |
12505 | -- order to handle sensitive cases. These include: | |
87729e5a | 12506 | |
937e9676 AC |
12507 | -- * Aggregate expansion |
12508 | -- * If, case, and expression with actions expansion | |
12509 | -- * Transient scopes | |
12510 | ||
12511 | -- If one of those contexts has marked the transient object as | |
12512 | -- ignored, do not generate finalization actions for it. | |
12513 | ||
12514 | elsif Is_Finalized_Transient (Obj_Id) | |
12515 | or else Is_Ignored_Transient (Obj_Id) | |
12516 | then | |
87729e5a AC |
12517 | null; |
12518 | ||
8636f52f HK |
12519 | -- Ignored Ghost objects do not need any cleanup actions because |
12520 | -- they will not appear in the final tree. | |
12521 | ||
12522 | elsif Is_Ignored_Ghost_Entity (Obj_Id) then | |
12523 | null; | |
12524 | ||
87729e5a | 12525 | -- The object is of the form: |
3386e3ae | 12526 | -- Obj : [constant] Typ [:= Expr]; |
87729e5a | 12527 | -- |
3386e3ae AC |
12528 | -- Do not process tag-to-class-wide conversions because they do |
12529 | -- not yield an object. Do not process the incomplete view of a | |
12530 | -- deferred constant. Note that an object initialized by means | |
12531 | -- of a build-in-place function call may appear as a deferred | |
12532 | -- constant after expansion activities. These kinds of objects | |
12533 | -- must be finalized. | |
87729e5a AC |
12534 | |
12535 | elsif not Is_Imported (Obj_Id) | |
12536 | and then Needs_Finalization (Obj_Typ) | |
aab08130 | 12537 | and then not Is_Tag_To_Class_Wide_Conversion (Obj_Id) |
3386e3ae AC |
12538 | and then not (Ekind (Obj_Id) = E_Constant |
12539 | and then not Has_Completion (Obj_Id) | |
12540 | and then No (BIP_Initialization_Call (Obj_Id))) | |
87729e5a AC |
12541 | then |
12542 | return True; | |
12543 | ||
12544 | -- The object is of the form: | |
12545 | -- Obj : Access_Typ := Non_BIP_Function_Call'reference; | |
12546 | -- | |
12547 | -- Obj : Access_Typ := | |
cdc96e3e | 12548 | -- BIP_Function_Call (BIPalloc => 2, ...)'reference; |
87729e5a AC |
12549 | |
12550 | elsif Is_Access_Type (Obj_Typ) | |
12551 | and then Needs_Finalization | |
12552 | (Available_View (Designated_Type (Obj_Typ))) | |
12553 | and then Present (Expr) | |
12554 | and then | |
cdc96e3e AC |
12555 | (Is_Secondary_Stack_BIP_Func_Call (Expr) |
12556 | or else | |
12557 | (Is_Non_BIP_Func_Call (Expr) | |
12558 | and then not Is_Related_To_Func_Return (Obj_Id))) | |
87729e5a AC |
12559 | then |
12560 | return True; | |
12561 | ||
937e9676 AC |
12562 | -- Processing for "hook" objects generated for transient objects |
12563 | -- declared inside an Expression_With_Actions. | |
87729e5a AC |
12564 | |
12565 | elsif Is_Access_Type (Obj_Typ) | |
3cebd1c0 AC |
12566 | and then Present (Status_Flag_Or_Transient_Decl (Obj_Id)) |
12567 | and then Nkind (Status_Flag_Or_Transient_Decl (Obj_Id)) = | |
c5c780e6 | 12568 | N_Object_Declaration |
3cebd1c0 AC |
12569 | then |
12570 | return True; | |
12571 | ||
9b16cb57 RD |
12572 | -- Processing for intermediate results of if expressions where |
12573 | -- one of the alternatives uses a controlled function call. | |
3cebd1c0 AC |
12574 | |
12575 | elsif Is_Access_Type (Obj_Typ) | |
12576 | and then Present (Status_Flag_Or_Transient_Decl (Obj_Id)) | |
12577 | and then Nkind (Status_Flag_Or_Transient_Decl (Obj_Id)) = | |
9ab5d86b | 12578 | N_Defining_Identifier |
3cebd1c0 AC |
12579 | and then Present (Expr) |
12580 | and then Nkind (Expr) = N_Null | |
87729e5a AC |
12581 | then |
12582 | return True; | |
12583 | ||
12584 | -- Simple protected objects which use type System.Tasking. | |
12585 | -- Protected_Objects.Protection to manage their locks should be | |
12586 | -- treated as controlled since they require manual cleanup. | |
12587 | ||
12588 | elsif Ekind (Obj_Id) = E_Variable | |
c5c780e6 HK |
12589 | and then (Is_Simple_Protected_Type (Obj_Typ) |
12590 | or else Has_Simple_Protected_Object (Obj_Typ)) | |
87729e5a AC |
12591 | then |
12592 | return True; | |
12593 | end if; | |
12594 | ||
12595 | -- Specific cases of object renamings | |
12596 | ||
aab08130 | 12597 | elsif Nkind (Decl) = N_Object_Renaming_Declaration then |
87729e5a AC |
12598 | Obj_Id := Defining_Identifier (Decl); |
12599 | Obj_Typ := Base_Type (Etype (Obj_Id)); | |
12600 | ||
12601 | -- Bypass any form of processing for objects which have their | |
12602 | -- finalization disabled. This applies only to objects at the | |
12603 | -- library level. | |
12604 | ||
fcf848c4 | 12605 | if Lib_Level and then Finalize_Storage_Only (Obj_Typ) then |
87729e5a AC |
12606 | null; |
12607 | ||
8636f52f HK |
12608 | -- Ignored Ghost object renamings do not need any cleanup actions |
12609 | -- because they will not appear in the final tree. | |
12610 | ||
12611 | elsif Is_Ignored_Ghost_Entity (Obj_Id) then | |
12612 | null; | |
12613 | ||
87729e5a AC |
12614 | -- Return object of a build-in-place function. This case is |
12615 | -- recognized and marked by the expansion of an extended return | |
12616 | -- statement (see Expand_N_Extended_Return_Statement). | |
12617 | ||
12618 | elsif Needs_Finalization (Obj_Typ) | |
12619 | and then Is_Return_Object (Obj_Id) | |
3cebd1c0 | 12620 | and then Present (Status_Flag_Or_Transient_Decl (Obj_Id)) |
87729e5a AC |
12621 | then |
12622 | return True; | |
aab08130 | 12623 | |
a429e6b3 AC |
12624 | -- Detect a case where a source object has been initialized by |
12625 | -- a controlled function call or another object which was later | |
12626 | -- rewritten as a class-wide conversion of Ada.Tags.Displace. | |
aab08130 | 12627 | |
a429e6b3 AC |
12628 | -- Obj1 : CW_Type := Src_Obj; |
12629 | -- Obj2 : CW_Type := Function_Call (...); | |
aab08130 | 12630 | |
a429e6b3 AC |
12631 | -- Obj1 : CW_Type renames (... Ada.Tags.Displace (Src_Obj)); |
12632 | -- Tmp : ... := Function_Call (...)'reference; | |
12633 | -- Obj2 : CW_Type renames (... Ada.Tags.Displace (Tmp)); | |
aab08130 | 12634 | |
a429e6b3 | 12635 | elsif Is_Displacement_Of_Object_Or_Function_Result (Obj_Id) then |
aab08130 | 12636 | return True; |
87729e5a AC |
12637 | end if; |
12638 | ||
d3f70b35 AC |
12639 | -- Inspect the freeze node of an access-to-controlled type and look |
12640 | -- for a delayed finalization master. This case arises when the | |
12641 | -- freeze actions are inserted at a later time than the expansion of | |
12642 | -- the context. Since Build_Finalizer is never called on a single | |
12643 | -- construct twice, the master will be ultimately left out and never | |
12644 | -- finalized. This is also needed for freeze actions of designated | |
12645 | -- types themselves, since in some cases the finalization master is | |
12646 | -- associated with a designated type's freeze node rather than that | |
12647 | -- of the access type (see handling for freeze actions in | |
12648 | -- Build_Finalization_Master). | |
87729e5a AC |
12649 | |
12650 | elsif Nkind (Decl) = N_Freeze_Entity | |
12651 | and then Present (Actions (Decl)) | |
12652 | then | |
12653 | Typ := Entity (Decl); | |
12654 | ||
8636f52f HK |
12655 | -- Freeze nodes for ignored Ghost types do not need cleanup |
12656 | -- actions because they will never appear in the final tree. | |
12657 | ||
12658 | if Is_Ignored_Ghost_Entity (Typ) then | |
12659 | null; | |
12660 | ||
5af3a22a | 12661 | elsif ((Is_Access_Object_Type (Typ) |
8636f52f HK |
12662 | and then Needs_Finalization |
12663 | (Available_View (Designated_Type (Typ)))) | |
12664 | or else (Is_Type (Typ) and then Needs_Finalization (Typ))) | |
8f66cda7 | 12665 | and then Requires_Cleanup_Actions |
fcf848c4 | 12666 | (Actions (Decl), Lib_Level, Nested_Constructs) |
87729e5a AC |
12667 | then |
12668 | return True; | |
12669 | end if; | |
12670 | ||
12671 | -- Nested package declarations | |
12672 | ||
2ba7e31e AC |
12673 | elsif Nested_Constructs |
12674 | and then Nkind (Decl) = N_Package_Declaration | |
12675 | then | |
8636f52f | 12676 | Pack_Id := Defining_Entity (Decl); |
87729e5a | 12677 | |
8636f52f HK |
12678 | -- Do not inspect an ignored Ghost package because all code found |
12679 | -- within will not appear in the final tree. | |
87729e5a | 12680 | |
8636f52f HK |
12681 | if Is_Ignored_Ghost_Entity (Pack_Id) then |
12682 | null; | |
12683 | ||
12684 | elsif Ekind (Pack_Id) /= E_Generic_Package | |
12685 | and then Requires_Cleanup_Actions | |
12686 | (Specification (Decl), Lib_Level) | |
87729e5a AC |
12687 | then |
12688 | return True; | |
12689 | end if; | |
12690 | ||
12691 | -- Nested package bodies | |
12692 | ||
0e564ab4 | 12693 | elsif Nested_Constructs and then Nkind (Decl) = N_Package_Body then |
87729e5a | 12694 | |
8636f52f HK |
12695 | -- Do not inspect an ignored Ghost package body because all code |
12696 | -- found within will not appear in the final tree. | |
12697 | ||
12698 | if Is_Ignored_Ghost_Entity (Defining_Entity (Decl)) then | |
12699 | null; | |
12700 | ||
12701 | elsif Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package | |
fcf848c4 | 12702 | and then Requires_Cleanup_Actions (Decl, Lib_Level) |
87729e5a AC |
12703 | then |
12704 | return True; | |
12705 | end if; | |
8636f52f HK |
12706 | |
12707 | elsif Nkind (Decl) = N_Block_Statement | |
12708 | and then | |
12709 | ||
937e9676 | 12710 | -- Handle a rare case caused by a controlled transient object |
8636f52f HK |
12711 | -- created as part of a record init proc. The variable is wrapped |
12712 | -- in a block, but the block is not associated with a transient | |
12713 | -- scope. | |
12714 | ||
12715 | (Inside_Init_Proc | |
12716 | ||
12717 | -- Handle the case where the original context has been wrapped in | |
12718 | -- a block to avoid interference between exception handlers and | |
12719 | -- At_End handlers. Treat the block as transparent and process its | |
12720 | -- contents. | |
12721 | ||
12722 | or else Is_Finalization_Wrapper (Decl)) | |
12723 | then | |
12724 | if Requires_Cleanup_Actions (Decl, Lib_Level) then | |
12725 | return True; | |
12726 | end if; | |
87729e5a AC |
12727 | end if; |
12728 | ||
12729 | Next (Decl); | |
12730 | end loop; | |
12731 | ||
12732 | return False; | |
12733 | end Requires_Cleanup_Actions; | |
12734 | ||
70482933 RK |
12735 | ------------------------------------ |
12736 | -- Safe_Unchecked_Type_Conversion -- | |
12737 | ------------------------------------ | |
12738 | ||
273adcdf AC |
12739 | -- Note: this function knows quite a bit about the exact requirements of |
12740 | -- Gigi with respect to unchecked type conversions, and its code must be | |
12741 | -- coordinated with any changes in Gigi in this area. | |
70482933 RK |
12742 | |
12743 | -- The above requirements should be documented in Sinfo ??? | |
12744 | ||
12745 | function Safe_Unchecked_Type_Conversion (Exp : Node_Id) return Boolean is | |
12746 | Otyp : Entity_Id; | |
12747 | Ityp : Entity_Id; | |
12748 | Oalign : Uint; | |
12749 | Ialign : Uint; | |
12750 | Pexp : constant Node_Id := Parent (Exp); | |
12751 | ||
12752 | begin | |
12753 | -- If the expression is the RHS of an assignment or object declaration | |
0cc1540d | 12754 | -- we are always OK because there will always be a target. |
70482933 RK |
12755 | |
12756 | -- Object renaming declarations, (generated for view conversions of | |
12757 | -- actuals in inlined calls), like object declarations, provide an | |
12758 | -- explicit type, and are safe as well. | |
12759 | ||
12760 | if (Nkind (Pexp) = N_Assignment_Statement | |
12761 | and then Expression (Pexp) = Exp) | |
4a08c95c AC |
12762 | or else Nkind (Pexp) |
12763 | in N_Object_Declaration | N_Object_Renaming_Declaration | |
70482933 RK |
12764 | then |
12765 | return True; | |
12766 | ||
273adcdf AC |
12767 | -- If the expression is the prefix of an N_Selected_Component we should |
12768 | -- also be OK because GCC knows to look inside the conversion except if | |
12769 | -- the type is discriminated. We assume that we are OK anyway if the | |
12770 | -- type is not set yet or if it is controlled since we can't afford to | |
12771 | -- introduce a temporary in this case. | |
70482933 RK |
12772 | |
12773 | elsif Nkind (Pexp) = N_Selected_Component | |
0e564ab4 | 12774 | and then Prefix (Pexp) = Exp |
70482933 | 12775 | then |
12ad5b9c EB |
12776 | return No (Etype (Pexp)) |
12777 | or else not Is_Type (Etype (Pexp)) | |
12778 | or else not Has_Discriminants (Etype (Pexp)) | |
12779 | or else Is_Constrained (Etype (Pexp)); | |
70482933 RK |
12780 | end if; |
12781 | ||
273adcdf AC |
12782 | -- Set the output type, this comes from Etype if it is set, otherwise we |
12783 | -- take it from the subtype mark, which we assume was already fully | |
12784 | -- analyzed. | |
70482933 RK |
12785 | |
12786 | if Present (Etype (Exp)) then | |
12787 | Otyp := Etype (Exp); | |
12788 | else | |
12789 | Otyp := Entity (Subtype_Mark (Exp)); | |
12790 | end if; | |
12791 | ||
0cc1540d AC |
12792 | -- The input type always comes from the expression, and we assume this |
12793 | -- is indeed always analyzed, so we can simply get the Etype. | |
70482933 RK |
12794 | |
12795 | Ityp := Etype (Expression (Exp)); | |
12796 | ||
12797 | -- Initialize alignments to unknown so far | |
12798 | ||
12799 | Oalign := No_Uint; | |
12800 | Ialign := No_Uint; | |
12801 | ||
273adcdf AC |
12802 | -- Replace a concurrent type by its corresponding record type and each |
12803 | -- type by its underlying type and do the tests on those. The original | |
12804 | -- type may be a private type whose completion is a concurrent type, so | |
12805 | -- find the underlying type first. | |
70482933 RK |
12806 | |
12807 | if Present (Underlying_Type (Otyp)) then | |
12808 | Otyp := Underlying_Type (Otyp); | |
12809 | end if; | |
12810 | ||
12811 | if Present (Underlying_Type (Ityp)) then | |
12812 | Ityp := Underlying_Type (Ityp); | |
12813 | end if; | |
12814 | ||
12815 | if Is_Concurrent_Type (Otyp) then | |
12816 | Otyp := Corresponding_Record_Type (Otyp); | |
12817 | end if; | |
12818 | ||
12819 | if Is_Concurrent_Type (Ityp) then | |
12820 | Ityp := Corresponding_Record_Type (Ityp); | |
12821 | end if; | |
12822 | ||
12823 | -- If the base types are the same, we know there is no problem since | |
12824 | -- this conversion will be a noop. | |
12825 | ||
12826 | if Implementation_Base_Type (Otyp) = Implementation_Base_Type (Ityp) then | |
12827 | return True; | |
12828 | ||
6cdb2c6e AC |
12829 | -- Same if this is an upwards conversion of an untagged type, and there |
12830 | -- are no constraints involved (could be more general???) | |
12831 | ||
12832 | elsif Etype (Ityp) = Otyp | |
12833 | and then not Is_Tagged_Type (Ityp) | |
12834 | and then not Has_Discriminants (Ityp) | |
12835 | and then No (First_Rep_Item (Base_Type (Ityp))) | |
12836 | then | |
12837 | return True; | |
12838 | ||
273adcdf AC |
12839 | -- If the expression has an access type (object or subprogram) we assume |
12840 | -- that the conversion is safe, because the size of the target is safe, | |
12841 | -- even if it is a record (which might be treated as having unknown size | |
12842 | -- at this point). | |
4da17013 AC |
12843 | |
12844 | elsif Is_Access_Type (Ityp) then | |
12845 | return True; | |
12846 | ||
273adcdf AC |
12847 | -- If the size of output type is known at compile time, there is never |
12848 | -- a problem. Note that unconstrained records are considered to be of | |
12849 | -- known size, but we can't consider them that way here, because we are | |
12850 | -- talking about the actual size of the object. | |
70482933 | 12851 | |
273adcdf AC |
12852 | -- We also make sure that in addition to the size being known, we do not |
12853 | -- have a case which might generate an embarrassingly large temp in | |
12854 | -- stack checking mode. | |
70482933 RK |
12855 | |
12856 | elsif Size_Known_At_Compile_Time (Otyp) | |
7324bf49 AC |
12857 | and then |
12858 | (not Stack_Checking_Enabled | |
0e564ab4 | 12859 | or else not May_Generate_Large_Temp (Otyp)) |
70482933 RK |
12860 | and then not (Is_Record_Type (Otyp) and then not Is_Constrained (Otyp)) |
12861 | then | |
12862 | return True; | |
12863 | ||
0cc1540d AC |
12864 | -- If either type is tagged, then we know the alignment is OK so Gigi |
12865 | -- will be able to use pointer punning. | |
70482933 RK |
12866 | |
12867 | elsif Is_Tagged_Type (Otyp) or else Is_Tagged_Type (Ityp) then | |
12868 | return True; | |
12869 | ||
273adcdf AC |
12870 | -- If either type is a limited record type, we cannot do a copy, so say |
12871 | -- safe since there's nothing else we can do. | |
70482933 RK |
12872 | |
12873 | elsif Is_Limited_Record (Otyp) or else Is_Limited_Record (Ityp) then | |
12874 | return True; | |
12875 | ||
12876 | -- Conversions to and from packed array types are always ignored and | |
12877 | -- hence are safe. | |
12878 | ||
8ca597af RD |
12879 | elsif Is_Packed_Array_Impl_Type (Otyp) |
12880 | or else Is_Packed_Array_Impl_Type (Ityp) | |
70482933 RK |
12881 | then |
12882 | return True; | |
12883 | end if; | |
12884 | ||
12885 | -- The only other cases known to be safe is if the input type's | |
12886 | -- alignment is known to be at least the maximum alignment for the | |
12887 | -- target or if both alignments are known and the output type's | |
273adcdf | 12888 | -- alignment is no stricter than the input's. We can use the component |
ff7b374b | 12889 | -- type alignment for an array if a type is an unpacked array type. |
70482933 RK |
12890 | |
12891 | if Present (Alignment_Clause (Otyp)) then | |
12892 | Oalign := Expr_Value (Expression (Alignment_Clause (Otyp))); | |
12893 | ||
12894 | elsif Is_Array_Type (Otyp) | |
12895 | and then Present (Alignment_Clause (Component_Type (Otyp))) | |
12896 | then | |
12897 | Oalign := Expr_Value (Expression (Alignment_Clause | |
12898 | (Component_Type (Otyp)))); | |
12899 | end if; | |
12900 | ||
12901 | if Present (Alignment_Clause (Ityp)) then | |
12902 | Ialign := Expr_Value (Expression (Alignment_Clause (Ityp))); | |
12903 | ||
12904 | elsif Is_Array_Type (Ityp) | |
12905 | and then Present (Alignment_Clause (Component_Type (Ityp))) | |
12906 | then | |
12907 | Ialign := Expr_Value (Expression (Alignment_Clause | |
12908 | (Component_Type (Ityp)))); | |
12909 | end if; | |
12910 | ||
12911 | if Ialign /= No_Uint and then Ialign > Maximum_Alignment then | |
12912 | return True; | |
12913 | ||
c5c780e6 HK |
12914 | elsif Ialign /= No_Uint |
12915 | and then Oalign /= No_Uint | |
70482933 RK |
12916 | and then Ialign <= Oalign |
12917 | then | |
12918 | return True; | |
12919 | ||
bebbff91 | 12920 | -- Otherwise, Gigi cannot handle this and we must make a temporary |
70482933 RK |
12921 | |
12922 | else | |
12923 | return False; | |
12924 | end if; | |
70482933 RK |
12925 | end Safe_Unchecked_Type_Conversion; |
12926 | ||
05350ac6 BD |
12927 | --------------------------------- |
12928 | -- Set_Current_Value_Condition -- | |
12929 | --------------------------------- | |
12930 | ||
12931 | -- Note: the implementation of this procedure is very closely tied to the | |
12932 | -- implementation of Get_Current_Value_Condition. Here we set required | |
12933 | -- Current_Value fields, and in Get_Current_Value_Condition, we interpret | |
12934 | -- them, so they must have a consistent view. | |
12935 | ||
12936 | procedure Set_Current_Value_Condition (Cnode : Node_Id) is | |
12937 | ||
12938 | procedure Set_Entity_Current_Value (N : Node_Id); | |
12939 | -- If N is an entity reference, where the entity is of an appropriate | |
12940 | -- kind, then set the current value of this entity to Cnode, unless | |
12941 | -- there is already a definite value set there. | |
12942 | ||
12943 | procedure Set_Expression_Current_Value (N : Node_Id); | |
12944 | -- If N is of an appropriate form, sets an appropriate entry in current | |
12945 | -- value fields of relevant entities. Multiple entities can be affected | |
12946 | -- in the case of an AND or AND THEN. | |
12947 | ||
12948 | ------------------------------ | |
12949 | -- Set_Entity_Current_Value -- | |
12950 | ------------------------------ | |
12951 | ||
12952 | procedure Set_Entity_Current_Value (N : Node_Id) is | |
12953 | begin | |
12954 | if Is_Entity_Name (N) then | |
12955 | declare | |
12956 | Ent : constant Entity_Id := Entity (N); | |
12957 | ||
12958 | begin | |
12959 | -- Don't capture if not safe to do so | |
12960 | ||
12961 | if not Safe_To_Capture_Value (N, Ent, Cond => True) then | |
12962 | return; | |
12963 | end if; | |
12964 | ||
273adcdf AC |
12965 | -- Here we have a case where the Current_Value field may need |
12966 | -- to be set. We set it if it is not already set to a compile | |
12967 | -- time expression value. | |
05350ac6 BD |
12968 | |
12969 | -- Note that this represents a decision that one condition | |
273adcdf AC |
12970 | -- blots out another previous one. That's certainly right if |
12971 | -- they occur at the same level. If the second one is nested, | |
12972 | -- then the decision is neither right nor wrong (it would be | |
12973 | -- equally OK to leave the outer one in place, or take the new | |
8e334288 | 12974 | -- inner one). Really we should record both, but our data |
273adcdf | 12975 | -- structures are not that elaborate. |
05350ac6 BD |
12976 | |
12977 | if Nkind (Current_Value (Ent)) not in N_Subexpr then | |
12978 | Set_Current_Value (Ent, Cnode); | |
12979 | end if; | |
12980 | end; | |
12981 | end if; | |
12982 | end Set_Entity_Current_Value; | |
12983 | ||
12984 | ---------------------------------- | |
12985 | -- Set_Expression_Current_Value -- | |
12986 | ---------------------------------- | |
12987 | ||
12988 | procedure Set_Expression_Current_Value (N : Node_Id) is | |
12989 | Cond : Node_Id; | |
12990 | ||
12991 | begin | |
12992 | Cond := N; | |
12993 | ||
12994 | -- Loop to deal with (ignore for now) any NOT operators present. The | |
12995 | -- presence of NOT operators will be handled properly when we call | |
12996 | -- Get_Current_Value_Condition. | |
12997 | ||
12998 | while Nkind (Cond) = N_Op_Not loop | |
12999 | Cond := Right_Opnd (Cond); | |
13000 | end loop; | |
13001 | ||
13002 | -- For an AND or AND THEN, recursively process operands | |
13003 | ||
13004 | if Nkind (Cond) = N_Op_And or else Nkind (Cond) = N_And_Then then | |
13005 | Set_Expression_Current_Value (Left_Opnd (Cond)); | |
13006 | Set_Expression_Current_Value (Right_Opnd (Cond)); | |
13007 | return; | |
13008 | end if; | |
13009 | ||
13010 | -- Check possible relational operator | |
13011 | ||
13012 | if Nkind (Cond) in N_Op_Compare then | |
13013 | if Compile_Time_Known_Value (Right_Opnd (Cond)) then | |
13014 | Set_Entity_Current_Value (Left_Opnd (Cond)); | |
13015 | elsif Compile_Time_Known_Value (Left_Opnd (Cond)) then | |
13016 | Set_Entity_Current_Value (Right_Opnd (Cond)); | |
13017 | end if; | |
13018 | ||
4a08c95c AC |
13019 | elsif Nkind (Cond) in N_Type_Conversion |
13020 | | N_Qualified_Expression | |
13021 | | N_Expression_With_Actions | |
064f4527 TQ |
13022 | then |
13023 | Set_Expression_Current_Value (Expression (Cond)); | |
13024 | ||
13025 | -- Check possible boolean variable reference | |
05350ac6 BD |
13026 | |
13027 | else | |
13028 | Set_Entity_Current_Value (Cond); | |
13029 | end if; | |
13030 | end Set_Expression_Current_Value; | |
13031 | ||
13032 | -- Start of processing for Set_Current_Value_Condition | |
13033 | ||
13034 | begin | |
13035 | Set_Expression_Current_Value (Condition (Cnode)); | |
13036 | end Set_Current_Value_Condition; | |
13037 | ||
70482933 RK |
13038 | -------------------------- |
13039 | -- Set_Elaboration_Flag -- | |
13040 | -------------------------- | |
13041 | ||
13042 | procedure Set_Elaboration_Flag (N : Node_Id; Spec_Id : Entity_Id) is | |
13043 | Loc : constant Source_Ptr := Sloc (N); | |
fbf5a39b | 13044 | Ent : constant Entity_Id := Elaboration_Entity (Spec_Id); |
70482933 RK |
13045 | Asn : Node_Id; |
13046 | ||
13047 | begin | |
fbf5a39b | 13048 | if Present (Ent) then |
70482933 RK |
13049 | |
13050 | -- Nothing to do if at the compilation unit level, because in this | |
13051 | -- case the flag is set by the binder generated elaboration routine. | |
13052 | ||
13053 | if Nkind (Parent (N)) = N_Compilation_Unit then | |
13054 | null; | |
13055 | ||
13056 | -- Here we do need to generate an assignment statement | |
13057 | ||
13058 | else | |
13059 | Check_Restriction (No_Elaboration_Code, N); | |
8dce7371 | 13060 | |
70482933 RK |
13061 | Asn := |
13062 | Make_Assignment_Statement (Loc, | |
fbf5a39b | 13063 | Name => New_Occurrence_Of (Ent, Loc), |
824e9320 | 13064 | Expression => Make_Integer_Literal (Loc, Uint_1)); |
70482933 | 13065 | |
8dce7371 PMR |
13066 | -- Mark the assignment statement as elaboration code. This allows |
13067 | -- the early call region mechanism (see Sem_Elab) to properly | |
3f833dc2 | 13068 | -- ignore such assignments even though they are nonpreelaborable |
8dce7371 PMR |
13069 | -- code. |
13070 | ||
13071 | Set_Is_Elaboration_Code (Asn); | |
13072 | ||
70482933 RK |
13073 | if Nkind (Parent (N)) = N_Subunit then |
13074 | Insert_After (Corresponding_Stub (Parent (N)), Asn); | |
13075 | else | |
13076 | Insert_After (N, Asn); | |
13077 | end if; | |
13078 | ||
13079 | Analyze (Asn); | |
fbf5a39b | 13080 | |
65df5b71 HK |
13081 | -- Kill current value indication. This is necessary because the |
13082 | -- tests of this flag are inserted out of sequence and must not | |
13083 | -- pick up bogus indications of the wrong constant value. | |
fbf5a39b AC |
13084 | |
13085 | Set_Current_Value (Ent, Empty); | |
113a9fb6 AC |
13086 | |
13087 | -- If the subprogram is in the current declarative part and | |
13088 | -- 'access has been applied to it, generate an elaboration | |
13089 | -- check at the beginning of the declarations of the body. | |
13090 | ||
13091 | if Nkind (N) = N_Subprogram_Body | |
13092 | and then Address_Taken (Spec_Id) | |
13093 | and then | |
4a08c95c | 13094 | Ekind (Scope (Spec_Id)) in E_Block | E_Procedure | E_Function |
113a9fb6 AC |
13095 | then |
13096 | declare | |
13097 | Loc : constant Source_Ptr := Sloc (N); | |
13098 | Decls : constant List_Id := Declarations (N); | |
13099 | Chk : Node_Id; | |
13100 | ||
13101 | begin | |
13102 | -- No need to generate this check if first entry in the | |
13103 | -- declaration list is a raise of Program_Error now. | |
13104 | ||
13105 | if Present (Decls) | |
13106 | and then Nkind (First (Decls)) = N_Raise_Program_Error | |
13107 | then | |
13108 | return; | |
13109 | end if; | |
13110 | ||
13111 | -- Otherwise generate the check | |
13112 | ||
13113 | Chk := | |
13114 | Make_Raise_Program_Error (Loc, | |
13115 | Condition => | |
13116 | Make_Op_Eq (Loc, | |
13117 | Left_Opnd => New_Occurrence_Of (Ent, Loc), | |
13118 | Right_Opnd => Make_Integer_Literal (Loc, Uint_0)), | |
13119 | Reason => PE_Access_Before_Elaboration); | |
13120 | ||
13121 | if No (Decls) then | |
13122 | Set_Declarations (N, New_List (Chk)); | |
13123 | else | |
13124 | Prepend (Chk, Decls); | |
13125 | end if; | |
13126 | ||
13127 | Analyze (Chk); | |
13128 | end; | |
13129 | end if; | |
70482933 RK |
13130 | end if; |
13131 | end if; | |
13132 | end Set_Elaboration_Flag; | |
13133 | ||
59e54267 ES |
13134 | ---------------------------- |
13135 | -- Set_Renamed_Subprogram -- | |
13136 | ---------------------------- | |
13137 | ||
13138 | procedure Set_Renamed_Subprogram (N : Node_Id; E : Entity_Id) is | |
13139 | begin | |
13140 | -- If input node is an identifier, we can just reset it | |
13141 | ||
13142 | if Nkind (N) = N_Identifier then | |
13143 | Set_Chars (N, Chars (E)); | |
13144 | Set_Entity (N, E); | |
13145 | ||
13146 | -- Otherwise we have to do a rewrite, preserving Comes_From_Source | |
13147 | ||
13148 | else | |
13149 | declare | |
13150 | CS : constant Boolean := Comes_From_Source (N); | |
13151 | begin | |
7675ad4f | 13152 | Rewrite (N, Make_Identifier (Sloc (N), Chars (E))); |
59e54267 ES |
13153 | Set_Entity (N, E); |
13154 | Set_Comes_From_Source (N, CS); | |
13155 | Set_Analyzed (N, True); | |
13156 | end; | |
13157 | end if; | |
13158 | end Set_Renamed_Subprogram; | |
13159 | ||
adb252d8 AC |
13160 | ---------------------- |
13161 | -- Side_Effect_Free -- | |
13162 | ---------------------- | |
13163 | ||
13164 | function Side_Effect_Free | |
13165 | (N : Node_Id; | |
13166 | Name_Req : Boolean := False; | |
13167 | Variable_Ref : Boolean := False) return Boolean | |
13168 | is | |
e7cff5af RD |
13169 | Typ : constant Entity_Id := Etype (N); |
13170 | -- Result type of the expression | |
13171 | ||
adb252d8 AC |
13172 | function Safe_Prefixed_Reference (N : Node_Id) return Boolean; |
13173 | -- The argument N is a construct where the Prefix is dereferenced if it | |
13174 | -- is an access type and the result is a variable. The call returns True | |
13175 | -- if the construct is side effect free (not considering side effects in | |
13176 | -- other than the prefix which are to be tested by the caller). | |
13177 | ||
13178 | function Within_In_Parameter (N : Node_Id) return Boolean; | |
13179 | -- Determines if N is a subcomponent of a composite in-parameter. If so, | |
13180 | -- N is not side-effect free when the actual is global and modifiable | |
13181 | -- indirectly from within a subprogram, because it may be passed by | |
13182 | -- reference. The front-end must be conservative here and assume that | |
13183 | -- this may happen with any array or record type. On the other hand, we | |
13184 | -- cannot create temporaries for all expressions for which this | |
13185 | -- condition is true, for various reasons that might require clearing up | |
13186 | -- ??? For example, discriminant references that appear out of place, or | |
13187 | -- spurious type errors with class-wide expressions. As a result, we | |
13188 | -- limit the transformation to loop bounds, which is so far the only | |
13189 | -- case that requires it. | |
13190 | ||
13191 | ----------------------------- | |
13192 | -- Safe_Prefixed_Reference -- | |
13193 | ----------------------------- | |
13194 | ||
13195 | function Safe_Prefixed_Reference (N : Node_Id) return Boolean is | |
13196 | begin | |
13197 | -- If prefix is not side effect free, definitely not safe | |
13198 | ||
13199 | if not Side_Effect_Free (Prefix (N), Name_Req, Variable_Ref) then | |
13200 | return False; | |
13201 | ||
13202 | -- If the prefix is of an access type that is not access-to-constant, | |
13203 | -- then this construct is a variable reference, which means it is to | |
13204 | -- be considered to have side effects if Variable_Ref is set True. | |
13205 | ||
13206 | elsif Is_Access_Type (Etype (Prefix (N))) | |
13207 | and then not Is_Access_Constant (Etype (Prefix (N))) | |
13208 | and then Variable_Ref | |
13209 | then | |
13210 | -- Exception is a prefix that is the result of a previous removal | |
92b751fd | 13211 | -- of side effects. |
adb252d8 AC |
13212 | |
13213 | return Is_Entity_Name (Prefix (N)) | |
13214 | and then not Comes_From_Source (Prefix (N)) | |
13215 | and then Ekind (Entity (Prefix (N))) = E_Constant | |
13216 | and then Is_Internal_Name (Chars (Entity (Prefix (N)))); | |
13217 | ||
13218 | -- If the prefix is an explicit dereference then this construct is a | |
13219 | -- variable reference, which means it is to be considered to have | |
13220 | -- side effects if Variable_Ref is True. | |
13221 | ||
13222 | -- We do NOT exclude dereferences of access-to-constant types because | |
13223 | -- we handle them as constant view of variables. | |
13224 | ||
13225 | elsif Nkind (Prefix (N)) = N_Explicit_Dereference | |
13226 | and then Variable_Ref | |
13227 | then | |
13228 | return False; | |
13229 | ||
13230 | -- Note: The following test is the simplest way of solving a complex | |
13231 | -- problem uncovered by the following test (Side effect on loop bound | |
13232 | -- that is a subcomponent of a global variable: | |
13233 | ||
13234 | -- with Text_Io; use Text_Io; | |
13235 | -- procedure Tloop is | |
13236 | -- type X is | |
13237 | -- record | |
13238 | -- V : Natural := 4; | |
13239 | -- S : String (1..5) := (others => 'a'); | |
13240 | -- end record; | |
13241 | -- X1 : X; | |
13242 | ||
13243 | -- procedure Modi; | |
13244 | ||
13245 | -- generic | |
13246 | -- with procedure Action; | |
13247 | -- procedure Loop_G (Arg : X; Msg : String) | |
13248 | ||
13249 | -- procedure Loop_G (Arg : X; Msg : String) is | |
13250 | -- begin | |
13251 | -- Put_Line ("begin loop_g " & Msg & " will loop till: " | |
13252 | -- & Natural'Image (Arg.V)); | |
13253 | -- for Index in 1 .. Arg.V loop | |
13254 | -- Text_Io.Put_Line | |
13255 | -- (Natural'Image (Index) & " " & Arg.S (Index)); | |
13256 | -- if Index > 2 then | |
13257 | -- Modi; | |
13258 | -- end if; | |
13259 | -- end loop; | |
13260 | -- Put_Line ("end loop_g " & Msg); | |
13261 | -- end; | |
13262 | ||
13263 | -- procedure Loop1 is new Loop_G (Modi); | |
13264 | -- procedure Modi is | |
13265 | -- begin | |
13266 | -- X1.V := 1; | |
13267 | -- Loop1 (X1, "from modi"); | |
13268 | -- end; | |
13269 | -- | |
13270 | -- begin | |
13271 | -- Loop1 (X1, "initial"); | |
13272 | -- end; | |
13273 | ||
13274 | -- The output of the above program should be: | |
13275 | ||
13276 | -- begin loop_g initial will loop till: 4 | |
13277 | -- 1 a | |
13278 | -- 2 a | |
13279 | -- 3 a | |
13280 | -- begin loop_g from modi will loop till: 1 | |
13281 | -- 1 a | |
13282 | -- end loop_g from modi | |
13283 | -- 4 a | |
13284 | -- begin loop_g from modi will loop till: 1 | |
13285 | -- 1 a | |
13286 | -- end loop_g from modi | |
13287 | -- end loop_g initial | |
13288 | ||
13289 | -- If a loop bound is a subcomponent of a global variable, a | |
13290 | -- modification of that variable within the loop may incorrectly | |
13291 | -- affect the execution of the loop. | |
13292 | ||
13293 | elsif Nkind (Parent (Parent (N))) = N_Loop_Parameter_Specification | |
13294 | and then Within_In_Parameter (Prefix (N)) | |
13295 | and then Variable_Ref | |
13296 | then | |
13297 | return False; | |
13298 | ||
13299 | -- All other cases are side effect free | |
13300 | ||
13301 | else | |
13302 | return True; | |
13303 | end if; | |
13304 | end Safe_Prefixed_Reference; | |
13305 | ||
13306 | ------------------------- | |
13307 | -- Within_In_Parameter -- | |
13308 | ------------------------- | |
13309 | ||
13310 | function Within_In_Parameter (N : Node_Id) return Boolean is | |
13311 | begin | |
13312 | if not Comes_From_Source (N) then | |
13313 | return False; | |
13314 | ||
13315 | elsif Is_Entity_Name (N) then | |
13316 | return Ekind (Entity (N)) = E_In_Parameter; | |
13317 | ||
4a08c95c | 13318 | elsif Nkind (N) in N_Indexed_Component | N_Selected_Component then |
adb252d8 AC |
13319 | return Within_In_Parameter (Prefix (N)); |
13320 | ||
13321 | else | |
13322 | return False; | |
13323 | end if; | |
13324 | end Within_In_Parameter; | |
13325 | ||
13326 | -- Start of processing for Side_Effect_Free | |
13327 | ||
13328 | begin | |
bb012790 AC |
13329 | -- If volatile reference, always consider it to have side effects |
13330 | ||
13331 | if Is_Volatile_Reference (N) then | |
13332 | return False; | |
13333 | end if; | |
13334 | ||
adb252d8 AC |
13335 | -- Note on checks that could raise Constraint_Error. Strictly, if we |
13336 | -- take advantage of 11.6, these checks do not count as side effects. | |
13337 | -- However, we would prefer to consider that they are side effects, | |
bb072d1c | 13338 | -- since the back end CSE does not work very well on expressions which |
adb252d8 AC |
13339 | -- can raise Constraint_Error. On the other hand if we don't consider |
13340 | -- them to be side effect free, then we get some awkward expansions | |
13341 | -- in -gnato mode, resulting in code insertions at a point where we | |
13342 | -- do not have a clear model for performing the insertions. | |
13343 | ||
13344 | -- Special handling for entity names | |
13345 | ||
13346 | if Is_Entity_Name (N) then | |
13347 | ||
bb012790 AC |
13348 | -- A type reference is always side effect free |
13349 | ||
13350 | if Is_Type (Entity (N)) then | |
13351 | return True; | |
13352 | ||
adb252d8 AC |
13353 | -- Variables are considered to be a side effect if Variable_Ref |
13354 | -- is set or if we have a volatile reference and Name_Req is off. | |
13355 | -- If Name_Req is True then we can't help returning a name which | |
13356 | -- effectively allows multiple references in any case. | |
13357 | ||
bb012790 | 13358 | elsif Is_Variable (N, Use_Original_Node => False) then |
adb252d8 AC |
13359 | return not Variable_Ref |
13360 | and then (not Is_Volatile_Reference (N) or else Name_Req); | |
13361 | ||
13362 | -- Any other entity (e.g. a subtype name) is definitely side | |
13363 | -- effect free. | |
13364 | ||
13365 | else | |
13366 | return True; | |
13367 | end if; | |
13368 | ||
13369 | -- A value known at compile time is always side effect free | |
13370 | ||
13371 | elsif Compile_Time_Known_Value (N) then | |
13372 | return True; | |
13373 | ||
13374 | -- A variable renaming is not side-effect free, because the renaming | |
13375 | -- will function like a macro in the front-end in some cases, and an | |
13376 | -- assignment can modify the component designated by N, so we need to | |
13377 | -- create a temporary for it. | |
13378 | ||
13379 | -- The guard testing for Entity being present is needed at least in | |
13380 | -- the case of rewritten predicate expressions, and may well also be | |
13381 | -- appropriate elsewhere. Obviously we can't go testing the entity | |
13382 | -- field if it does not exist, so it's reasonable to say that this is | |
13383 | -- not the renaming case if it does not exist. | |
13384 | ||
13385 | elsif Is_Entity_Name (Original_Node (N)) | |
13386 | and then Present (Entity (Original_Node (N))) | |
13387 | and then Is_Renaming_Of_Object (Entity (Original_Node (N))) | |
13388 | and then Ekind (Entity (Original_Node (N))) /= E_Constant | |
13389 | then | |
13390 | declare | |
13391 | RO : constant Node_Id := | |
13392 | Renamed_Object (Entity (Original_Node (N))); | |
13393 | ||
13394 | begin | |
13395 | -- If the renamed object is an indexed component, or an | |
13396 | -- explicit dereference, then the designated object could | |
13397 | -- be modified by an assignment. | |
13398 | ||
4a08c95c | 13399 | if Nkind (RO) in N_Indexed_Component | N_Explicit_Dereference then |
adb252d8 AC |
13400 | return False; |
13401 | ||
13402 | -- A selected component must have a safe prefix | |
13403 | ||
13404 | elsif Nkind (RO) = N_Selected_Component then | |
13405 | return Safe_Prefixed_Reference (RO); | |
13406 | ||
13407 | -- In all other cases, designated object cannot be changed so | |
13408 | -- we are side effect free. | |
13409 | ||
13410 | else | |
13411 | return True; | |
13412 | end if; | |
13413 | end; | |
13414 | ||
13415 | -- Remove_Side_Effects generates an object renaming declaration to | |
13416 | -- capture the expression of a class-wide expression. In VM targets | |
13417 | -- the frontend performs no expansion for dispatching calls to | |
13418 | -- class- wide types since they are handled by the VM. Hence, we must | |
13419 | -- locate here if this node corresponds to a previous invocation of | |
13420 | -- Remove_Side_Effects to avoid a never ending loop in the frontend. | |
13421 | ||
535a8637 | 13422 | elsif not Tagged_Type_Expansion |
f145ece7 AC |
13423 | and then not Comes_From_Source (N) |
13424 | and then Nkind (Parent (N)) = N_Object_Renaming_Declaration | |
13425 | and then Is_Class_Wide_Type (Typ) | |
adb252d8 AC |
13426 | then |
13427 | return True; | |
6905a049 AC |
13428 | |
13429 | -- Generating C the type conversion of an access to constrained array | |
13430 | -- type into an access to unconstrained array type involves initializing | |
13431 | -- a fat pointer and the expression cannot be assumed to be free of side | |
13432 | -- effects since it must referenced several times to compute its bounds. | |
13433 | ||
c63a2ad6 | 13434 | elsif Modify_Tree_For_C |
6905a049 AC |
13435 | and then Nkind (N) = N_Type_Conversion |
13436 | and then Is_Access_Type (Typ) | |
13437 | and then Is_Array_Type (Designated_Type (Typ)) | |
13438 | and then not Is_Constrained (Designated_Type (Typ)) | |
13439 | then | |
13440 | return False; | |
adb252d8 AC |
13441 | end if; |
13442 | ||
13443 | -- For other than entity names and compile time known values, | |
13444 | -- check the node kind for special processing. | |
13445 | ||
13446 | case Nkind (N) is | |
13447 | ||
cf9e3829 EB |
13448 | -- An attribute reference is side-effect free if its expressions |
13449 | -- are side-effect free and its prefix is side-effect free or is | |
13450 | -- an entity reference. | |
adb252d8 AC |
13451 | |
13452 | when N_Attribute_Reference => | |
cf9e3829 EB |
13453 | return Side_Effect_Free_Attribute (Attribute_Name (N)) |
13454 | and then | |
13455 | Side_Effect_Free (Expressions (N), Name_Req, Variable_Ref) | |
13456 | and then | |
13457 | (Is_Entity_Name (Prefix (N)) | |
13458 | or else | |
13459 | Side_Effect_Free (Prefix (N), Name_Req, Variable_Ref)); | |
adb252d8 AC |
13460 | |
13461 | -- A binary operator is side effect free if and both operands are | |
13462 | -- side effect free. For this purpose binary operators include | |
13463 | -- membership tests and short circuit forms. | |
13464 | ||
d8f43ee6 HK |
13465 | when N_Binary_Op |
13466 | | N_Membership_Test | |
13467 | | N_Short_Circuit | |
13468 | => | |
adb252d8 AC |
13469 | return Side_Effect_Free (Left_Opnd (N), Name_Req, Variable_Ref) |
13470 | and then | |
13471 | Side_Effect_Free (Right_Opnd (N), Name_Req, Variable_Ref); | |
13472 | ||
13473 | -- An explicit dereference is side effect free only if it is | |
13474 | -- a side effect free prefixed reference. | |
13475 | ||
13476 | when N_Explicit_Dereference => | |
13477 | return Safe_Prefixed_Reference (N); | |
13478 | ||
13479 | -- An expression with action is side effect free if its expression | |
13480 | -- is side effect free and it has no actions. | |
13481 | ||
13482 | when N_Expression_With_Actions => | |
d8f43ee6 HK |
13483 | return |
13484 | Is_Empty_List (Actions (N)) | |
13485 | and then Side_Effect_Free | |
13486 | (Expression (N), Name_Req, Variable_Ref); | |
adb252d8 AC |
13487 | |
13488 | -- A call to _rep_to_pos is side effect free, since we generate | |
13489 | -- this pure function call ourselves. Moreover it is critically | |
13490 | -- important to make this exception, since otherwise we can have | |
13491 | -- discriminants in array components which don't look side effect | |
13492 | -- free in the case of an array whose index type is an enumeration | |
13493 | -- type with an enumeration rep clause. | |
13494 | ||
13495 | -- All other function calls are not side effect free | |
13496 | ||
13497 | when N_Function_Call => | |
d8f43ee6 HK |
13498 | return |
13499 | Nkind (Name (N)) = N_Identifier | |
13500 | and then Is_TSS (Name (N), TSS_Rep_To_Pos) | |
13501 | and then Side_Effect_Free | |
13502 | (First (Parameter_Associations (N)), | |
13503 | Name_Req, Variable_Ref); | |
adb252d8 | 13504 | |
e7cff5af RD |
13505 | -- An IF expression is side effect free if it's of a scalar type, and |
13506 | -- all its components are all side effect free (conditions and then | |
13507 | -- actions and else actions). We restrict to scalar types, since it | |
13508 | -- is annoying to deal with things like (if A then B else C)'First | |
13509 | -- where the type involved is a string type. | |
a767d69b | 13510 | |
e7cff5af | 13511 | when N_If_Expression => |
d8f43ee6 HK |
13512 | return |
13513 | Is_Scalar_Type (Typ) | |
13514 | and then Side_Effect_Free | |
13515 | (Expressions (N), Name_Req, Variable_Ref); | |
a767d69b | 13516 | |
adb252d8 AC |
13517 | -- An indexed component is side effect free if it is a side |
13518 | -- effect free prefixed reference and all the indexing | |
13519 | -- expressions are side effect free. | |
13520 | ||
13521 | when N_Indexed_Component => | |
d8f43ee6 HK |
13522 | return |
13523 | Side_Effect_Free (Expressions (N), Name_Req, Variable_Ref) | |
13524 | and then Safe_Prefixed_Reference (N); | |
adb252d8 | 13525 | |
304757d2 AC |
13526 | -- A type qualification, type conversion, or unchecked expression is |
13527 | -- side effect free if the expression is side effect free. | |
adb252d8 | 13528 | |
304757d2 AC |
13529 | when N_Qualified_Expression |
13530 | | N_Type_Conversion | |
13531 | | N_Unchecked_Expression | |
13532 | => | |
adb252d8 AC |
13533 | return Side_Effect_Free (Expression (N), Name_Req, Variable_Ref); |
13534 | ||
13535 | -- A selected component is side effect free only if it is a side | |
22e89283 | 13536 | -- effect free prefixed reference. |
adb252d8 AC |
13537 | |
13538 | when N_Selected_Component => | |
22e89283 | 13539 | return Safe_Prefixed_Reference (N); |
adb252d8 AC |
13540 | |
13541 | -- A range is side effect free if the bounds are side effect free | |
13542 | ||
13543 | when N_Range => | |
13544 | return Side_Effect_Free (Low_Bound (N), Name_Req, Variable_Ref) | |
c5c780e6 | 13545 | and then |
adb252d8 AC |
13546 | Side_Effect_Free (High_Bound (N), Name_Req, Variable_Ref); |
13547 | ||
13548 | -- A slice is side effect free if it is a side effect free | |
13549 | -- prefixed reference and the bounds are side effect free. | |
13550 | ||
13551 | when N_Slice => | |
d8f43ee6 HK |
13552 | return |
13553 | Side_Effect_Free (Discrete_Range (N), Name_Req, Variable_Ref) | |
13554 | and then Safe_Prefixed_Reference (N); | |
adb252d8 | 13555 | |
adb252d8 AC |
13556 | -- A unary operator is side effect free if the operand |
13557 | -- is side effect free. | |
13558 | ||
13559 | when N_Unary_Op => | |
13560 | return Side_Effect_Free (Right_Opnd (N), Name_Req, Variable_Ref); | |
13561 | ||
13562 | -- An unchecked type conversion is side effect free only if it | |
13563 | -- is safe and its argument is side effect free. | |
13564 | ||
13565 | when N_Unchecked_Type_Conversion => | |
d8f43ee6 HK |
13566 | return |
13567 | Safe_Unchecked_Type_Conversion (N) | |
13568 | and then Side_Effect_Free | |
13569 | (Expression (N), Name_Req, Variable_Ref); | |
adb252d8 | 13570 | |
adb252d8 AC |
13571 | -- A literal is side effect free |
13572 | ||
d8f43ee6 HK |
13573 | when N_Character_Literal |
13574 | | N_Integer_Literal | |
13575 | | N_Real_Literal | |
13576 | | N_String_Literal | |
13577 | => | |
adb252d8 AC |
13578 | return True; |
13579 | ||
c4609e75 AC |
13580 | -- An aggregate is side effect free if all its values are compile |
13581 | -- time known. | |
13582 | ||
13583 | when N_Aggregate => | |
13584 | return Compile_Time_Known_Aggregate (N); | |
13585 | ||
adb252d8 AC |
13586 | -- We consider that anything else has side effects. This is a bit |
13587 | -- crude, but we are pretty close for most common cases, and we | |
13588 | -- are certainly correct (i.e. we never return True when the | |
13589 | -- answer should be False). | |
13590 | ||
13591 | when others => | |
13592 | return False; | |
13593 | end case; | |
13594 | end Side_Effect_Free; | |
13595 | ||
13596 | -- A list is side effect free if all elements of the list are side | |
13597 | -- effect free. | |
13598 | ||
13599 | function Side_Effect_Free | |
13600 | (L : List_Id; | |
13601 | Name_Req : Boolean := False; | |
13602 | Variable_Ref : Boolean := False) return Boolean | |
13603 | is | |
13604 | N : Node_Id; | |
13605 | ||
13606 | begin | |
13607 | if L = No_List or else L = Error_List then | |
13608 | return True; | |
13609 | ||
13610 | else | |
13611 | N := First (L); | |
13612 | while Present (N) loop | |
13613 | if not Side_Effect_Free (N, Name_Req, Variable_Ref) then | |
13614 | return False; | |
13615 | else | |
13616 | Next (N); | |
13617 | end if; | |
13618 | end loop; | |
13619 | ||
13620 | return True; | |
13621 | end if; | |
13622 | end Side_Effect_Free; | |
13623 | ||
cf9e3829 EB |
13624 | -------------------------------- |
13625 | -- Side_Effect_Free_Attribute -- | |
13626 | -------------------------------- | |
13627 | ||
13628 | function Side_Effect_Free_Attribute (Name : Name_Id) return Boolean is | |
13629 | begin | |
13630 | case Name is | |
13631 | when Name_Input => | |
13632 | return False; | |
13633 | ||
13634 | when Name_Image | |
13635 | | Name_Img | |
13636 | | Name_Wide_Image | |
13637 | | Name_Wide_Wide_Image | |
13638 | => | |
13639 | -- CodePeer doesn't want to see replicated copies of 'Image calls | |
13640 | ||
13641 | return not CodePeer_Mode; | |
13642 | ||
13643 | when others => | |
13644 | return True; | |
13645 | end case; | |
13646 | end Side_Effect_Free_Attribute; | |
13647 | ||
65df5b71 HK |
13648 | ---------------------------------- |
13649 | -- Silly_Boolean_Array_Not_Test -- | |
13650 | ---------------------------------- | |
13651 | ||
13652 | -- This procedure implements an odd and silly test. We explicitly check | |
13653 | -- for the case where the 'First of the component type is equal to the | |
13654 | -- 'Last of this component type, and if this is the case, we make sure | |
13655 | -- that constraint error is raised. The reason is that the NOT is bound | |
13656 | -- to cause CE in this case, and we will not otherwise catch it. | |
13657 | ||
b3b9865d AC |
13658 | -- No such check is required for AND and OR, since for both these cases |
13659 | -- False op False = False, and True op True = True. For the XOR case, | |
13660 | -- see Silly_Boolean_Array_Xor_Test. | |
13661 | ||
273adcdf AC |
13662 | -- Believe it or not, this was reported as a bug. Note that nearly always, |
13663 | -- the test will evaluate statically to False, so the code will be | |
13664 | -- statically removed, and no extra overhead caused. | |
65df5b71 HK |
13665 | |
13666 | procedure Silly_Boolean_Array_Not_Test (N : Node_Id; T : Entity_Id) is | |
13667 | Loc : constant Source_Ptr := Sloc (N); | |
13668 | CT : constant Entity_Id := Component_Type (T); | |
13669 | ||
13670 | begin | |
b3b9865d AC |
13671 | -- The check we install is |
13672 | ||
13673 | -- constraint_error when | |
13674 | -- component_type'first = component_type'last | |
13675 | -- and then array_type'Length /= 0) | |
13676 | ||
13677 | -- We need the last guard because we don't want to raise CE for empty | |
13678 | -- arrays since no out of range values result. (Empty arrays with a | |
13679 | -- component type of True .. True -- very useful -- even the ACATS | |
a90bd866 | 13680 | -- does not test that marginal case). |
b3b9865d | 13681 | |
65df5b71 HK |
13682 | Insert_Action (N, |
13683 | Make_Raise_Constraint_Error (Loc, | |
13684 | Condition => | |
b3b9865d | 13685 | Make_And_Then (Loc, |
65df5b71 | 13686 | Left_Opnd => |
b3b9865d AC |
13687 | Make_Op_Eq (Loc, |
13688 | Left_Opnd => | |
13689 | Make_Attribute_Reference (Loc, | |
13690 | Prefix => New_Occurrence_Of (CT, Loc), | |
13691 | Attribute_Name => Name_First), | |
13692 | ||
13693 | Right_Opnd => | |
13694 | Make_Attribute_Reference (Loc, | |
13695 | Prefix => New_Occurrence_Of (CT, Loc), | |
13696 | Attribute_Name => Name_Last)), | |
13697 | ||
13698 | Right_Opnd => Make_Non_Empty_Check (Loc, Right_Opnd (N))), | |
65df5b71 HK |
13699 | Reason => CE_Range_Check_Failed)); |
13700 | end Silly_Boolean_Array_Not_Test; | |
13701 | ||
13702 | ---------------------------------- | |
13703 | -- Silly_Boolean_Array_Xor_Test -- | |
13704 | ---------------------------------- | |
13705 | ||
13706 | -- This procedure implements an odd and silly test. We explicitly check | |
13707 | -- for the XOR case where the component type is True .. True, since this | |
13708 | -- will raise constraint error. A special check is required since CE | |
f17889b3 | 13709 | -- will not be generated otherwise (cf Expand_Packed_Not). |
65df5b71 HK |
13710 | |
13711 | -- No such check is required for AND and OR, since for both these cases | |
b3b9865d AC |
13712 | -- False op False = False, and True op True = True, and no check is |
13713 | -- required for the case of False .. False, since False xor False = False. | |
13714 | -- See also Silly_Boolean_Array_Not_Test | |
65df5b71 | 13715 | |
076bbec1 | 13716 | procedure Silly_Boolean_Array_Xor_Test |
89beb653 HK |
13717 | (N : Node_Id; |
13718 | R : Node_Id; | |
13719 | T : Entity_Id) | |
13720 | is | |
65df5b71 HK |
13721 | Loc : constant Source_Ptr := Sloc (N); |
13722 | CT : constant Entity_Id := Component_Type (T); | |
65df5b71 HK |
13723 | |
13724 | begin | |
f17889b3 RD |
13725 | -- The check we install is |
13726 | ||
13727 | -- constraint_error when | |
13728 | -- Boolean (component_type'First) | |
13729 | -- and then Boolean (component_type'Last) | |
13730 | -- and then array_type'Length /= 0) | |
13731 | ||
13732 | -- We need the last guard because we don't want to raise CE for empty | |
13733 | -- arrays since no out of range values result (Empty arrays with a | |
13734 | -- component type of True .. True -- very useful -- even the ACATS | |
a90bd866 | 13735 | -- does not test that marginal case). |
f17889b3 | 13736 | |
65df5b71 HK |
13737 | Insert_Action (N, |
13738 | Make_Raise_Constraint_Error (Loc, | |
13739 | Condition => | |
f17889b3 | 13740 | Make_And_Then (Loc, |
89beb653 | 13741 | Left_Opnd => |
f17889b3 | 13742 | Make_And_Then (Loc, |
89beb653 | 13743 | Left_Opnd => |
f17889b3 RD |
13744 | Convert_To (Standard_Boolean, |
13745 | Make_Attribute_Reference (Loc, | |
13746 | Prefix => New_Occurrence_Of (CT, Loc), | |
13747 | Attribute_Name => Name_First)), | |
65df5b71 HK |
13748 | |
13749 | Right_Opnd => | |
f17889b3 RD |
13750 | Convert_To (Standard_Boolean, |
13751 | Make_Attribute_Reference (Loc, | |
13752 | Prefix => New_Occurrence_Of (CT, Loc), | |
13753 | Attribute_Name => Name_Last))), | |
65df5b71 | 13754 | |
076bbec1 | 13755 | Right_Opnd => Make_Non_Empty_Check (Loc, R)), |
89beb653 | 13756 | Reason => CE_Range_Check_Failed)); |
65df5b71 HK |
13757 | end Silly_Boolean_Array_Xor_Test; |
13758 | ||
c7c7dd3a EB |
13759 | ---------------------------- |
13760 | -- Small_Integer_Type_For -- | |
13761 | ---------------------------- | |
13762 | ||
13763 | function Small_Integer_Type_For (S : Uint; Uns : Boolean) return Entity_Id | |
13764 | is | |
13765 | begin | |
13766 | pragma Assert (S <= System_Max_Integer_Size); | |
13767 | ||
13768 | if S <= Standard_Short_Short_Integer_Size then | |
13769 | if Uns then | |
13770 | return Standard_Short_Short_Unsigned; | |
13771 | else | |
13772 | return Standard_Short_Short_Integer; | |
13773 | end if; | |
13774 | ||
13775 | elsif S <= Standard_Short_Integer_Size then | |
13776 | if Uns then | |
13777 | return Standard_Short_Unsigned; | |
13778 | else | |
13779 | return Standard_Short_Integer; | |
13780 | end if; | |
13781 | ||
13782 | elsif S <= Standard_Integer_Size then | |
13783 | if Uns then | |
13784 | return Standard_Unsigned; | |
13785 | else | |
13786 | return Standard_Integer; | |
13787 | end if; | |
13788 | ||
13789 | elsif S <= Standard_Long_Integer_Size then | |
13790 | if Uns then | |
13791 | return Standard_Long_Unsigned; | |
13792 | else | |
13793 | return Standard_Long_Integer; | |
13794 | end if; | |
13795 | ||
13796 | elsif S <= Standard_Long_Long_Integer_Size then | |
13797 | if Uns then | |
13798 | return Standard_Long_Long_Unsigned; | |
13799 | else | |
13800 | return Standard_Long_Long_Integer; | |
13801 | end if; | |
13802 | ||
a5476382 EB |
13803 | elsif S <= Standard_Long_Long_Long_Integer_Size then |
13804 | if Uns then | |
13805 | return Standard_Long_Long_Long_Unsigned; | |
13806 | else | |
13807 | return Standard_Long_Long_Long_Integer; | |
13808 | end if; | |
13809 | ||
c7c7dd3a EB |
13810 | else |
13811 | raise Program_Error; | |
13812 | end if; | |
13813 | end Small_Integer_Type_For; | |
13814 | ||
b619c88e AC |
13815 | ------------------- |
13816 | -- Type_Map_Hash -- | |
13817 | ------------------- | |
13818 | ||
13819 | function Type_Map_Hash (Id : Entity_Id) return Type_Map_Header is | |
13820 | begin | |
13821 | return Type_Map_Header (Id mod Type_Map_Size); | |
13822 | end Type_Map_Hash; | |
13823 | ||
91b1417d AC |
13824 | ------------------------------------------ |
13825 | -- Type_May_Have_Bit_Aligned_Components -- | |
13826 | ------------------------------------------ | |
13827 | ||
13828 | function Type_May_Have_Bit_Aligned_Components | |
13829 | (Typ : Entity_Id) return Boolean | |
13830 | is | |
13831 | begin | |
13832 | -- Array type, check component type | |
13833 | ||
13834 | if Is_Array_Type (Typ) then | |
13835 | return | |
13836 | Type_May_Have_Bit_Aligned_Components (Component_Type (Typ)); | |
13837 | ||
13838 | -- Record type, check components | |
13839 | ||
13840 | elsif Is_Record_Type (Typ) then | |
13841 | declare | |
13842 | E : Entity_Id; | |
13843 | ||
13844 | begin | |
dee4682a | 13845 | E := First_Component_Or_Discriminant (Typ); |
91b1417d | 13846 | while Present (E) loop |
fba9fcae EB |
13847 | -- This is the crucial test: if the component itself causes |
13848 | -- trouble, then we can stop and return True. | |
13849 | ||
13850 | if Component_May_Be_Bit_Aligned (E) then | |
13851 | return True; | |
13852 | end if; | |
13853 | ||
13854 | -- Otherwise, we need to test its type, to see if it may | |
13855 | -- itself contain a troublesome component. | |
13856 | ||
13857 | if Type_May_Have_Bit_Aligned_Components (Etype (E)) then | |
dee4682a | 13858 | return True; |
91b1417d AC |
13859 | end if; |
13860 | ||
dee4682a | 13861 | Next_Component_Or_Discriminant (E); |
91b1417d AC |
13862 | end loop; |
13863 | ||
13864 | return False; | |
13865 | end; | |
13866 | ||
13867 | -- Type other than array or record is always OK | |
13868 | ||
13869 | else | |
13870 | return False; | |
13871 | end if; | |
13872 | end Type_May_Have_Bit_Aligned_Components; | |
13873 | ||
f63d601b HK |
13874 | ------------------------------- |
13875 | -- Update_Primitives_Mapping -- | |
13876 | ------------------------------- | |
13877 | ||
13878 | procedure Update_Primitives_Mapping | |
13879 | (Inher_Id : Entity_Id; | |
13880 | Subp_Id : Entity_Id) | |
13881 | is | |
13882 | begin | |
b619c88e AC |
13883 | Map_Types |
13884 | (Parent_Type => Find_Dispatching_Type (Inher_Id), | |
13885 | Derived_Type => Find_Dispatching_Type (Subp_Id)); | |
f63d601b HK |
13886 | end Update_Primitives_Mapping; |
13887 | ||
4c7e0990 AC |
13888 | ---------------------------------- |
13889 | -- Within_Case_Or_If_Expression -- | |
13890 | ---------------------------------- | |
13891 | ||
13892 | function Within_Case_Or_If_Expression (N : Node_Id) return Boolean is | |
13893 | Par : Node_Id; | |
13894 | ||
13895 | begin | |
b2c28399 AC |
13896 | -- Locate an enclosing case or if expression. Note that these constructs |
13897 | -- can be expanded into Expression_With_Actions, hence the test of the | |
13898 | -- original node. | |
4c7e0990 | 13899 | |
b2c28399 | 13900 | Par := Parent (N); |
4c7e0990 | 13901 | while Present (Par) loop |
4a08c95c | 13902 | if Nkind (Original_Node (Par)) in N_Case_Expression | N_If_Expression |
4c7e0990 AC |
13903 | then |
13904 | return True; | |
13905 | ||
13906 | -- Prevent the search from going too far | |
13907 | ||
a7e68e7f | 13908 | elsif Is_Body_Or_Package_Declaration (Par) then |
4c7e0990 AC |
13909 | return False; |
13910 | end if; | |
13911 | ||
13912 | Par := Parent (Par); | |
13913 | end loop; | |
13914 | ||
13915 | return False; | |
13916 | end Within_Case_Or_If_Expression; | |
13917 | ||
152f64c2 AC |
13918 | ------------------------------ |
13919 | -- Predicate_Check_In_Scope -- | |
13920 | ------------------------------ | |
8e1e62e3 | 13921 | |
152f64c2 | 13922 | function Predicate_Check_In_Scope (N : Node_Id) return Boolean is |
8e1e62e3 AC |
13923 | S : Entity_Id; |
13924 | ||
13925 | begin | |
13926 | S := Current_Scope; | |
13927 | while Present (S) and then not Is_Subprogram (S) loop | |
13928 | S := Scope (S); | |
13929 | end loop; | |
13930 | ||
152f64c2 AC |
13931 | if Present (S) then |
13932 | ||
13933 | -- Predicate checks should only be enabled in init procs for | |
13934 | -- expressions coming from source. | |
13935 | ||
13936 | if Is_Init_Proc (S) then | |
13937 | return Comes_From_Source (N); | |
13938 | ||
13939 | elsif Get_TSS_Name (S) /= TSS_Null | |
13940 | and then not Is_Predicate_Function (S) | |
13941 | and then not Is_Predicate_Function_M (S) | |
13942 | then | |
13943 | return False; | |
13944 | end if; | |
13945 | end if; | |
13946 | ||
13947 | return True; | |
13948 | end Predicate_Check_In_Scope; | |
8e1e62e3 | 13949 | |
70482933 | 13950 | end Exp_Util; |