1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 2010-2013, Free Software Foundation, Inc. --
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- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package defines the aspects that are recognized by GNAT in aspect
33 -- specifications. It also contains the subprograms for storing/retrieving
34 -- aspect specifications from the tree. The semantic processing for aspect
35 -- specifications is found in Sem_Ch13.Analyze_Aspect_Specifications.
37 ------------------------
38 -- Adding New Aspects --
39 ------------------------
41 -- In general, each aspect should have a corresponding pragma, so that the
42 -- newly developed functionality is available for Ada versions < Ada 2012.
43 -- When both are defined, it is convenient to first transform the aspect into
44 -- an equivalent pragma in Sem_Ch13.Analyze_Aspect_Specifications, and then
45 -- analyze the pragma in Sem_Prag.Analyze_Pragma.
47 -- To add a new aspect, you need to do the following
49 -- 1. Create a name in snames.ads-tmpl
51 -- 2. Create a value in type Aspect_Id in this unit
53 -- 3. Add a value for the aspect in the global arrays defined in this unit
55 -- 4. Add code for the aspect in Sem_Ch13.Analyze_Aspect_Specifications.
56 -- This may involve adding some nodes to the tree to perform additional
59 -- 5. If the semantic analysis of expressions/names in the aspect should not
60 -- occur at the point the aspect is defined, add code in the adequate
61 -- semantic analysis procedure for the aspect. For example, this is the
62 -- case for aspects Pre and Post on subprograms, which are pre-analyzed
63 -- at the end of the declaration list to which the subprogram belongs,
64 -- and fully analyzed (possibly with expansion) during the semantic
65 -- analysis of subprogram bodies.
67 with Namet; use Namet;
68 with Snames; use Snames;
69 with Types; use Types;
73 -- Type defining recognized aspects
76 (No_Aspect, -- Dummy entry for no aspect
77 Aspect_Abstract_State, -- GNAT
80 Aspect_Attach_Handler,
82 Aspect_Component_Size,
83 Aspect_Constant_Indexing,
84 Aspect_Contract_Cases, -- GNAT
87 Aspect_Default_Component_Value,
88 Aspect_Default_Iterator,
90 Aspect_Depends, -- GNAT
91 Aspect_Dimension, -- GNAT
92 Aspect_Dimension_System, -- GNAT
93 Aspect_Dispatching_Domain,
94 Aspect_Dynamic_Predicate,
97 Aspect_Global, -- GNAT
98 Aspect_Implicit_Dereference,
100 Aspect_Interrupt_Priority,
101 Aspect_Invariant, -- GNAT
102 Aspect_Iterator_Element,
104 Aspect_Machine_Radix,
105 Aspect_Object_Size, -- GNAT
108 Aspect_Postcondition,
111 Aspect_Predicate, -- GNAT
114 Aspect_Refined_Depends, -- GNAT
115 Aspect_Refined_Global, -- GNAT
116 Aspect_Refined_Post, -- GNAT
117 Aspect_Refined_Pre, -- GNAT
118 Aspect_Refined_State, -- GNAT
119 Aspect_Relative_Deadline,
120 Aspect_Scalar_Storage_Order, -- GNAT
121 Aspect_Simple_Storage_Pool, -- GNAT
124 Aspect_SPARK_Mode, -- GNAT
125 Aspect_Static_Predicate,
130 Aspect_Synchronization,
131 Aspect_Test_Case, -- GNAT
132 Aspect_Type_Invariant,
134 Aspect_Value_Size, -- GNAT
135 Aspect_Variable_Indexing,
136 Aspect_Warnings, -- GNAT
139 -- The following aspects correspond to library unit pragmas
141 Aspect_All_Calls_Remote,
142 Aspect_Compiler_Unit, -- GNAT
143 Aspect_Elaborate_Body,
145 Aspect_Preelaborate_05, -- GNAT
147 Aspect_Pure_05, -- GNAT
148 Aspect_Pure_12, -- GNAT
149 Aspect_Remote_Call_Interface,
151 Aspect_Shared_Passive,
152 Aspect_Universal_Data, -- GNAT
154 -- Remaining aspects have a static boolean value that turns the aspect
155 -- on or off. They all correspond to pragmas, but are only converted to
156 -- the pragmas where the value is True. A value of False normally means
157 -- that the aspect is ignored, except in the case of derived types where
158 -- the aspect value is inherited from the parent, in which case, we do
159 -- not allow False if we inherit a True value from the parent.
161 Aspect_Ada_2005, -- GNAT
162 Aspect_Ada_2012, -- GNAT
165 Aspect_Atomic_Components,
166 Aspect_Discard_Names,
168 Aspect_Favor_Top_Level, -- GNAT
170 Aspect_Independent_Components,
173 Aspect_Inline_Always, -- GNAT
174 Aspect_Interrupt_Handler,
177 Aspect_Persistent_BSS, -- GNAT
178 Aspect_Preelaborable_Initialization,
179 Aspect_Pure_Function, -- GNAT
180 Aspect_Remote_Access_Type, -- GNAT
181 Aspect_Shared, -- GNAT (equivalent to Atomic)
182 Aspect_Simple_Storage_Pool_Type, -- GNAT
183 Aspect_Suppress_Debug_Info, -- GNAT
184 Aspect_Unchecked_Union,
185 Aspect_Universal_Aliasing, -- GNAT
186 Aspect_Unmodified, -- GNAT
187 Aspect_Unreferenced, -- GNAT
188 Aspect_Unreferenced_Objects, -- GNAT
190 Aspect_Volatile_Components,
192 -- Aspects that have a static boolean value but don't correspond to
195 Aspect_Lock_Free); -- GNAT
197 subtype Aspect_Id_Exclude_No_Aspect is
198 Aspect_Id range Aspect_Id'Succ (No_Aspect) .. Aspect_Id'Last;
199 -- Aspect_Id's excluding No_Aspect
201 -- The following array indicates aspects that accept 'Class
203 Class_Aspect_OK : constant array (Aspect_Id) of Boolean :=
204 (Aspect_Invariant => True,
206 Aspect_Predicate => True,
208 Aspect_Type_Invariant => True,
211 -- The following array identifies all implementation defined aspects
213 Implementation_Defined_Aspect : constant array (Aspect_Id) of Boolean :=
214 (Aspect_Abstract_State => True,
215 Aspect_Ada_2005 => True,
216 Aspect_Ada_2012 => True,
217 Aspect_Compiler_Unit => True,
218 Aspect_Contract_Cases => True,
219 Aspect_Depends => True,
220 Aspect_Dimension => True,
221 Aspect_Dimension_System => True,
222 Aspect_Favor_Top_Level => True,
223 Aspect_Global => True,
224 Aspect_Inline_Always => True,
225 Aspect_Invariant => True,
226 Aspect_Lock_Free => True,
227 Aspect_Object_Size => True,
228 Aspect_Persistent_BSS => True,
229 Aspect_Predicate => True,
230 Aspect_Preelaborate_05 => True,
231 Aspect_Pure_05 => True,
232 Aspect_Pure_12 => True,
233 Aspect_Pure_Function => True,
234 Aspect_Remote_Access_Type => True,
235 Aspect_Scalar_Storage_Order => True,
236 Aspect_Shared => True,
237 Aspect_Simple_Storage_Pool => True,
238 Aspect_Simple_Storage_Pool_Type => True,
239 Aspect_Suppress_Debug_Info => True,
240 Aspect_Test_Case => True,
241 Aspect_Universal_Aliasing => True,
242 Aspect_Universal_Data => True,
243 Aspect_Unmodified => True,
244 Aspect_Unreferenced => True,
245 Aspect_Unreferenced_Objects => True,
246 Aspect_Value_Size => True,
247 Aspect_Warnings => True,
250 -- The following array indicates aspects for which multiple occurrences of
251 -- the same aspect attached to the same declaration are allowed.
253 No_Duplicates_Allowed : constant array (Aspect_Id) of Boolean :=
254 (Aspect_Test_Case => False,
257 -- The following subtype defines aspects corresponding to library unit
258 -- pragmas, these can only validly appear as aspects for library units,
259 -- and result in a corresponding pragma being inserted immediately after
260 -- the occurrence of the aspect.
262 subtype Library_Unit_Aspects is
263 Aspect_Id range Aspect_All_Calls_Remote .. Aspect_Universal_Data;
265 -- The following subtype defines aspects accepting an optional static
266 -- boolean parameter indicating if the aspect should be active or
267 -- cancelling. If the parameter is missing the effective value is True,
268 -- enabling the aspect. If the parameter is present it must be a static
269 -- expression of type Standard.Boolean. If the value is True, then the
270 -- aspect is enabled. If it is False, the aspect is disabled.
272 subtype Boolean_Aspects is
273 Aspect_Id range Aspect_Ada_2005 .. Aspect_Id'Last;
275 subtype Pre_Post_Aspects is
276 Aspect_Id range Aspect_Post .. Aspect_Precondition;
278 -- The following type is used for indicating allowed expression forms
280 type Aspect_Expression is
281 (Expression, -- Required expression
282 Name, -- Required name
283 Optional_Expression, -- Optional boolean expression
284 Optional_Name); -- Optional name
286 -- The following array indicates what argument type is required
288 Aspect_Argument : constant array (Aspect_Id) of Aspect_Expression :=
289 (No_Aspect => Optional_Expression,
290 Aspect_Abstract_State => Expression,
291 Aspect_Address => Expression,
292 Aspect_Alignment => Expression,
293 Aspect_Attach_Handler => Expression,
294 Aspect_Bit_Order => Expression,
295 Aspect_Component_Size => Expression,
296 Aspect_Constant_Indexing => Name,
297 Aspect_Contract_Cases => Expression,
298 Aspect_Convention => Name,
299 Aspect_CPU => Expression,
300 Aspect_Default_Component_Value => Expression,
301 Aspect_Default_Iterator => Name,
302 Aspect_Default_Value => Expression,
303 Aspect_Depends => Expression,
304 Aspect_Dimension => Expression,
305 Aspect_Dimension_System => Expression,
306 Aspect_Dispatching_Domain => Expression,
307 Aspect_Dynamic_Predicate => Expression,
308 Aspect_External_Name => Expression,
309 Aspect_External_Tag => Expression,
310 Aspect_Global => Expression,
311 Aspect_Implicit_Dereference => Name,
312 Aspect_Input => Name,
313 Aspect_Interrupt_Priority => Expression,
314 Aspect_Invariant => Expression,
315 Aspect_Iterator_Element => Name,
316 Aspect_Link_Name => Expression,
317 Aspect_Machine_Radix => Expression,
318 Aspect_Object_Size => Expression,
319 Aspect_Output => Name,
320 Aspect_Post => Expression,
321 Aspect_Postcondition => Expression,
322 Aspect_Pre => Expression,
323 Aspect_Precondition => Expression,
324 Aspect_Predicate => Expression,
325 Aspect_Priority => Expression,
327 Aspect_Refined_Depends => Expression,
328 Aspect_Refined_Global => Expression,
329 Aspect_Refined_Post => Expression,
330 Aspect_Refined_Pre => Expression,
331 Aspect_Refined_State => Expression,
332 Aspect_Relative_Deadline => Expression,
333 Aspect_Scalar_Storage_Order => Expression,
334 Aspect_Simple_Storage_Pool => Name,
335 Aspect_Size => Expression,
336 Aspect_Small => Expression,
337 Aspect_SPARK_Mode => Optional_Name,
338 Aspect_Static_Predicate => Expression,
339 Aspect_Storage_Pool => Name,
340 Aspect_Storage_Size => Expression,
341 Aspect_Stream_Size => Expression,
342 Aspect_Suppress => Name,
343 Aspect_Synchronization => Name,
344 Aspect_Test_Case => Expression,
345 Aspect_Type_Invariant => Expression,
346 Aspect_Unsuppress => Name,
347 Aspect_Value_Size => Expression,
348 Aspect_Variable_Indexing => Name,
349 Aspect_Warnings => Name,
350 Aspect_Write => Name,
352 Boolean_Aspects => Optional_Expression,
353 Library_Unit_Aspects => Optional_Expression);
355 -----------------------------------------
356 -- Table Linking Names and Aspect_Id's --
357 -----------------------------------------
359 -- Table linking aspect names and id's
361 Aspect_Names : constant array (Aspect_Id) of Name_Id :=
362 (No_Aspect => No_Name,
363 Aspect_Abstract_State => Name_Abstract_State,
364 Aspect_Ada_2005 => Name_Ada_2005,
365 Aspect_Ada_2012 => Name_Ada_2012,
366 Aspect_Address => Name_Address,
367 Aspect_Alignment => Name_Alignment,
368 Aspect_All_Calls_Remote => Name_All_Calls_Remote,
369 Aspect_Asynchronous => Name_Asynchronous,
370 Aspect_Atomic => Name_Atomic,
371 Aspect_Atomic_Components => Name_Atomic_Components,
372 Aspect_Attach_Handler => Name_Attach_Handler,
373 Aspect_Bit_Order => Name_Bit_Order,
374 Aspect_Compiler_Unit => Name_Compiler_Unit,
375 Aspect_Component_Size => Name_Component_Size,
376 Aspect_Constant_Indexing => Name_Constant_Indexing,
377 Aspect_Contract_Cases => Name_Contract_Cases,
378 Aspect_Convention => Name_Convention,
379 Aspect_CPU => Name_CPU,
380 Aspect_Default_Iterator => Name_Default_Iterator,
381 Aspect_Default_Value => Name_Default_Value,
382 Aspect_Default_Component_Value => Name_Default_Component_Value,
383 Aspect_Depends => Name_Depends,
384 Aspect_Dimension => Name_Dimension,
385 Aspect_Dimension_System => Name_Dimension_System,
386 Aspect_Discard_Names => Name_Discard_Names,
387 Aspect_Dispatching_Domain => Name_Dispatching_Domain,
388 Aspect_Dynamic_Predicate => Name_Dynamic_Predicate,
389 Aspect_Elaborate_Body => Name_Elaborate_Body,
390 Aspect_External_Name => Name_External_Name,
391 Aspect_External_Tag => Name_External_Tag,
392 Aspect_Export => Name_Export,
393 Aspect_Favor_Top_Level => Name_Favor_Top_Level,
394 Aspect_Global => Name_Global,
395 Aspect_Implicit_Dereference => Name_Implicit_Dereference,
396 Aspect_Import => Name_Import,
397 Aspect_Independent => Name_Independent,
398 Aspect_Independent_Components => Name_Independent_Components,
399 Aspect_Inline => Name_Inline,
400 Aspect_Inline_Always => Name_Inline_Always,
401 Aspect_Input => Name_Input,
402 Aspect_Interrupt_Handler => Name_Interrupt_Handler,
403 Aspect_Interrupt_Priority => Name_Interrupt_Priority,
404 Aspect_Invariant => Name_Invariant,
405 Aspect_Iterator_Element => Name_Iterator_Element,
406 Aspect_Link_Name => Name_Link_Name,
407 Aspect_Lock_Free => Name_Lock_Free,
408 Aspect_Machine_Radix => Name_Machine_Radix,
409 Aspect_No_Return => Name_No_Return,
410 Aspect_Object_Size => Name_Object_Size,
411 Aspect_Output => Name_Output,
412 Aspect_Pack => Name_Pack,
413 Aspect_Persistent_BSS => Name_Persistent_BSS,
414 Aspect_Post => Name_Post,
415 Aspect_Postcondition => Name_Postcondition,
416 Aspect_Pre => Name_Pre,
417 Aspect_Precondition => Name_Precondition,
418 Aspect_Predicate => Name_Predicate,
419 Aspect_Preelaborable_Initialization => Name_Preelaborable_Initialization,
420 Aspect_Preelaborate => Name_Preelaborate,
421 Aspect_Preelaborate_05 => Name_Preelaborate_05,
422 Aspect_Priority => Name_Priority,
423 Aspect_Pure => Name_Pure,
424 Aspect_Pure_05 => Name_Pure_05,
425 Aspect_Pure_12 => Name_Pure_12,
426 Aspect_Pure_Function => Name_Pure_Function,
427 Aspect_Read => Name_Read,
428 Aspect_Refined_Depends => Name_Refined_Depends,
429 Aspect_Refined_Global => Name_Refined_Global,
430 Aspect_Refined_Post => Name_Refined_Post,
431 Aspect_Refined_Pre => Name_Refined_Pre,
432 Aspect_Refined_State => Name_Refined_State,
433 Aspect_Relative_Deadline => Name_Relative_Deadline,
434 Aspect_Remote_Access_Type => Name_Remote_Access_Type,
435 Aspect_Remote_Call_Interface => Name_Remote_Call_Interface,
436 Aspect_Remote_Types => Name_Remote_Types,
437 Aspect_Scalar_Storage_Order => Name_Scalar_Storage_Order,
438 Aspect_Shared => Name_Shared,
439 Aspect_Shared_Passive => Name_Shared_Passive,
440 Aspect_Simple_Storage_Pool => Name_Simple_Storage_Pool,
441 Aspect_Simple_Storage_Pool_Type => Name_Simple_Storage_Pool_Type,
442 Aspect_Size => Name_Size,
443 Aspect_Small => Name_Small,
444 Aspect_SPARK_Mode => Name_SPARK_Mode,
445 Aspect_Static_Predicate => Name_Static_Predicate,
446 Aspect_Storage_Pool => Name_Storage_Pool,
447 Aspect_Storage_Size => Name_Storage_Size,
448 Aspect_Stream_Size => Name_Stream_Size,
449 Aspect_Suppress => Name_Suppress,
450 Aspect_Suppress_Debug_Info => Name_Suppress_Debug_Info,
451 Aspect_Synchronization => Name_Synchronization,
452 Aspect_Test_Case => Name_Test_Case,
453 Aspect_Type_Invariant => Name_Type_Invariant,
454 Aspect_Unchecked_Union => Name_Unchecked_Union,
455 Aspect_Universal_Aliasing => Name_Universal_Aliasing,
456 Aspect_Universal_Data => Name_Universal_Data,
457 Aspect_Unmodified => Name_Unmodified,
458 Aspect_Unreferenced => Name_Unreferenced,
459 Aspect_Unreferenced_Objects => Name_Unreferenced_Objects,
460 Aspect_Unsuppress => Name_Unsuppress,
461 Aspect_Value_Size => Name_Value_Size,
462 Aspect_Variable_Indexing => Name_Variable_Indexing,
463 Aspect_Volatile => Name_Volatile,
464 Aspect_Volatile_Components => Name_Volatile_Components,
465 Aspect_Warnings => Name_Warnings,
466 Aspect_Write => Name_Write);
468 function Get_Aspect_Id (Name : Name_Id) return Aspect_Id;
469 pragma Inline (Get_Aspect_Id);
470 -- Given a name Nam, returns the corresponding aspect id value. If the name
471 -- does not match any aspect, then No_Aspect is returned as the result.
473 function Get_Aspect_Id (Aspect : Node_Id) return Aspect_Id;
474 pragma Inline (Get_Aspect_Id);
475 -- Given an aspect specification, return the corresponding aspect_id value.
476 -- If the name does not match any aspect, return No_Aspect.
478 ------------------------------------
479 -- Delaying Evaluation of Aspects --
480 ------------------------------------
482 -- The RM requires that all language defined aspects taking an expression
483 -- delay evaluation of the expression till the freeze point of the entity
484 -- to which the aspect applies. This allows forward references, and is of
485 -- use for example in connection with preconditions and postconditions
486 -- where the requirement of making all references in contracts to local
487 -- functions be backwards references would be onerous.
489 -- For consistency, even attributes like Size are delayed, so we can do:
491 -- type A is range 1 .. 10
492 -- with Size => Not_Defined_Yet;
494 -- Not_Defined_Yet : constant := 64;
496 -- Resulting in A having a size of 64, which gets set when A is frozen.
497 -- Furthermore, we can have a situation like
499 -- type A is range 1 .. 10
500 -- with Size => Not_Defined_Yet;
504 -- Not_Defined_Yet : constant := 64;
506 -- where the Size of A is considered to have been previously specified at
507 -- the point of derivation, even though the actual value of the size is
508 -- not known yet, and in this example B inherits the size value of 64.
510 -- Our normal implementation model (prior to Ada 2012) was simply to copy
511 -- inheritable attributes at the point of derivation. Then any subsequent
512 -- representation items apply either to the parent type, not affecting the
513 -- derived type, or to the derived type, not affecting the parent type.
515 -- To deal with the delayed aspect case, we use two flags. The first is
516 -- set on the parent type if it has delayed representation aspects. This
517 -- flag Has_Delayed_Rep_Aspects indicates that if we derive from this type
518 -- we have to worry about making sure we inherit any delayed aspects. The
519 -- second flag is set on a derived type: May_Have_Inherited_Rep_Aspects
520 -- is set if the parent type has Has_Delayed_Rep_Aspects set.
522 -- When we freeze a derived type, if the May_Have_Inherited_Rep_Aspects
523 -- flag is set, then we call Freeze.Inherit_Delayed_Rep_Aspects when
524 -- the derived type is frozen, which deals with the necessary copying of
525 -- information from the parent type, which must be frozen at that point
526 -- (since freezing the derived type first freezes the parent type).
528 -- The following shows which aspects are delayed. There are three cases:
532 -- This aspect is not a representation aspect that can be inherited and
533 -- is always delayed, as required by the language definition.
536 -- There are two cases. There are language defined aspects like
537 -- Convention where the "expression" is simply an uninterpreted
538 -- identifier, and there is no issue of evaluating it and thus no
539 -- issue of delaying the evaluation. The second case is implementation
540 -- defined aspects where we have decided that we don't want to allow
541 -- delays (and for our own aspects we can do what we like!).
544 -- These are the cases of representation aspects that are in general
545 -- delayed, and where there is a potential issue of derived types that
546 -- inherit delayed representation values.
548 -- Note: even if this table indicates that an aspect is delayed, we never
549 -- delay Boolean aspects that have a missing expression (taken as True),
550 -- or expressions for delayed rep items that consist of an integer literal
551 -- (most cases of Size etc. in practice), since in these cases we know we
552 -- can get the value of the expression without delay. Note that we still
553 -- need to delay Boolean aspects that are specifically set to True:
555 -- type R is array (0 .. 31) of Boolean
556 -- with Pack => True;
557 -- True : constant Boolean := False;
559 -- This is nonsense, but we need to make it work and result in R not
560 -- being packed, and if we have something like:
562 -- type R is array (0 .. 31) of Boolean
563 -- with Pack => True;
565 -- True : constant Boolean := False;
567 -- This is illegal because the visibility of True changes after the freeze
568 -- point, which is not allowed, and we need the delay mechanism to properly
569 -- diagnose this error.
571 Aspect_Delay : constant array (Aspect_Id) of Delay_Type :=
572 (No_Aspect => Always_Delay,
573 Aspect_Address => Always_Delay,
574 Aspect_All_Calls_Remote => Always_Delay,
575 Aspect_Asynchronous => Always_Delay,
576 Aspect_Attach_Handler => Always_Delay,
577 Aspect_Compiler_Unit => Always_Delay,
578 Aspect_Constant_Indexing => Always_Delay,
579 Aspect_Contract_Cases => Always_Delay,
580 Aspect_CPU => Always_Delay,
581 Aspect_Default_Iterator => Always_Delay,
582 Aspect_Default_Value => Always_Delay,
583 Aspect_Default_Component_Value => Always_Delay,
584 Aspect_Depends => Always_Delay,
585 Aspect_Discard_Names => Always_Delay,
586 Aspect_Dispatching_Domain => Always_Delay,
587 Aspect_Dynamic_Predicate => Always_Delay,
588 Aspect_Elaborate_Body => Always_Delay,
589 Aspect_External_Name => Always_Delay,
590 Aspect_External_Tag => Always_Delay,
591 Aspect_Export => Always_Delay,
592 Aspect_Favor_Top_Level => Always_Delay,
593 Aspect_Global => Always_Delay,
594 Aspect_Implicit_Dereference => Always_Delay,
595 Aspect_Import => Always_Delay,
596 Aspect_Independent => Always_Delay,
597 Aspect_Independent_Components => Always_Delay,
598 Aspect_Inline => Always_Delay,
599 Aspect_Inline_Always => Always_Delay,
600 Aspect_Input => Always_Delay,
601 Aspect_Interrupt_Handler => Always_Delay,
602 Aspect_Interrupt_Priority => Always_Delay,
603 Aspect_Invariant => Always_Delay,
604 Aspect_Iterator_Element => Always_Delay,
605 Aspect_Link_Name => Always_Delay,
606 Aspect_Lock_Free => Always_Delay,
607 Aspect_No_Return => Always_Delay,
608 Aspect_Output => Always_Delay,
609 Aspect_Persistent_BSS => Always_Delay,
610 Aspect_Post => Always_Delay,
611 Aspect_Postcondition => Always_Delay,
612 Aspect_Pre => Always_Delay,
613 Aspect_Precondition => Always_Delay,
614 Aspect_Predicate => Always_Delay,
615 Aspect_Preelaborable_Initialization => Always_Delay,
616 Aspect_Preelaborate => Always_Delay,
617 Aspect_Preelaborate_05 => Always_Delay,
618 Aspect_Priority => Always_Delay,
619 Aspect_Pure => Always_Delay,
620 Aspect_Pure_05 => Always_Delay,
621 Aspect_Pure_12 => Always_Delay,
622 Aspect_Pure_Function => Always_Delay,
623 Aspect_Read => Always_Delay,
624 Aspect_Refined_Depends => Always_Delay,
625 Aspect_Refined_Global => Always_Delay,
626 Aspect_Refined_State => Always_Delay,
627 Aspect_Relative_Deadline => Always_Delay,
628 Aspect_Remote_Access_Type => Always_Delay,
629 Aspect_Remote_Call_Interface => Always_Delay,
630 Aspect_Remote_Types => Always_Delay,
631 Aspect_Shared => Always_Delay,
632 Aspect_Shared_Passive => Always_Delay,
633 Aspect_Simple_Storage_Pool => Always_Delay,
634 Aspect_Simple_Storage_Pool_Type => Always_Delay,
635 Aspect_Static_Predicate => Always_Delay,
636 Aspect_Storage_Pool => Always_Delay,
637 Aspect_Stream_Size => Always_Delay,
638 Aspect_Suppress => Always_Delay,
639 Aspect_Suppress_Debug_Info => Always_Delay,
640 Aspect_Type_Invariant => Always_Delay,
641 Aspect_Unchecked_Union => Always_Delay,
642 Aspect_Universal_Aliasing => Always_Delay,
643 Aspect_Universal_Data => Always_Delay,
644 Aspect_Unmodified => Always_Delay,
645 Aspect_Unreferenced => Always_Delay,
646 Aspect_Unreferenced_Objects => Always_Delay,
647 Aspect_Unsuppress => Always_Delay,
648 Aspect_Variable_Indexing => Always_Delay,
649 Aspect_Write => Always_Delay,
651 Aspect_Abstract_State => Never_Delay,
652 Aspect_Ada_2005 => Never_Delay,
653 Aspect_Ada_2012 => Never_Delay,
654 Aspect_Convention => Never_Delay,
655 Aspect_Dimension => Never_Delay,
656 Aspect_Dimension_System => Never_Delay,
657 Aspect_Refined_Post => Never_Delay,
658 Aspect_Refined_Pre => Never_Delay,
659 Aspect_SPARK_Mode => Never_Delay,
660 Aspect_Synchronization => Never_Delay,
661 Aspect_Test_Case => Never_Delay,
662 Aspect_Warnings => Never_Delay,
664 Aspect_Alignment => Rep_Aspect,
665 Aspect_Atomic => Rep_Aspect,
666 Aspect_Atomic_Components => Rep_Aspect,
667 Aspect_Bit_Order => Rep_Aspect,
668 Aspect_Component_Size => Rep_Aspect,
669 Aspect_Machine_Radix => Rep_Aspect,
670 Aspect_Object_Size => Rep_Aspect,
671 Aspect_Pack => Rep_Aspect,
672 Aspect_Scalar_Storage_Order => Rep_Aspect,
673 Aspect_Size => Rep_Aspect,
674 Aspect_Small => Rep_Aspect,
675 Aspect_Storage_Size => Rep_Aspect,
676 Aspect_Value_Size => Rep_Aspect,
677 Aspect_Volatile => Rep_Aspect,
678 Aspect_Volatile_Components => Rep_Aspect);
680 ------------------------------------------------
681 -- Handling of Aspect Specifications on Stubs --
682 ------------------------------------------------
684 -- Aspects that appear on the following stub nodes
686 -- N_Package_Body_Stub
687 -- N_Protected_Body_Stub
688 -- N_Subprogram_Body_Stub
691 -- are treated as if they apply to the corresponding proper body. Their
692 -- analysis is postponed until the analysis of the proper body takes place
693 -- (see Analyze_Proper_Body). The delay is required because the analysis
694 -- may generate extra code which would be harder to relocate to the body.
695 -- If the proper body is present, the aspect specifications are relocated
696 -- to the corresponding body node:
703 -- The subsequent analysis takes care of the aspect-to-pragma conversions
704 -- and verification of pragma legality. In the case where the proper body
705 -- is not available, the aspect specifications are analyzed on the spot
706 -- (see Analyze_Proper_Body) to catch potential errors.
708 -- The following table lists all aspects that can apply to a subprogram
709 -- body [stub]. For instance, the following example is legal:
711 -- package P with SPARK_Mode ...;
712 -- package body P with SPARK_Mode is ...;
714 -- The table should be synchronized with Pragma_On_Body_Or_Stub_OK in unit
715 -- Sem_Prag if the aspects below are implemented by a pragma.
717 Aspect_On_Body_Or_Stub_OK : constant array (Aspect_Id) of Boolean :=
718 (Aspect_Refined_Depends => True,
719 Aspect_Refined_Global => True,
720 Aspect_Refined_Post => True,
721 Aspect_Refined_Pre => True,
722 Aspect_SPARK_Mode => True,
723 Aspect_Warnings => True,
726 ---------------------------------------------------
727 -- Handling of Aspect Specifications in the Tree --
728 ---------------------------------------------------
730 -- Several kinds of declaration node permit aspect specifications in Ada
731 -- 2012 mode. If there was room in all the corresponding declaration nodes,
732 -- we could just have a field Aspect_Specifications pointing to a list of
733 -- nodes for the aspects (N_Aspect_Specification nodes). But there isn't
734 -- room, so we adopt a different approach.
736 -- The following subprograms provide access to a specialized interface
737 -- implemented internally with a hash table in the body, that provides
738 -- access to aspect specifications.
740 function Aspect_Specifications (N : Node_Id) return List_Id;
741 -- Given a node N, returns the list of N_Aspect_Specification nodes that
742 -- are attached to this declaration node. If the node is in the class of
743 -- declaration nodes that permit aspect specifications, as defined by the
744 -- predicate above, and if their Has_Aspects flag is set to True, then this
745 -- will always be a non-empty list. If this flag is set to False, then
746 -- No_List is returned. Normally, the only nodes that have Has_Aspects set
747 -- True are the nodes for which Permits_Aspect_Specifications would return
748 -- True (i.e. the declaration nodes defined in the RM as permitting the
749 -- presence of Aspect_Specifications). However, it is possible for the
750 -- flag Has_Aspects to be set on other nodes as a result of Rewrite and
751 -- Replace calls, and this function may be used to retrieve the aspect
752 -- specifications for the original rewritten node in such cases.
754 function Aspects_On_Body_Or_Stub_OK (N : Node_Id) return Boolean;
755 -- N denotes a body [stub] with aspects. Determine whether all aspects of N
756 -- are allowed to appear on a body [stub].
758 function Find_Aspect (Id : Entity_Id; A : Aspect_Id) return Node_Id;
759 -- Find the aspect specification of aspect A associated with entity I.
760 -- Return Empty if Id does not have the requested aspect.
762 function Find_Value_Of_Aspect
764 A : Aspect_Id) return Node_Id;
765 -- Find the value of aspect A associated with entity Id. Return Empty if
766 -- Id does not have the requested aspect.
768 function Has_Aspect (Id : Entity_Id; A : Aspect_Id) return Boolean;
769 -- Determine whether entity Id has aspect A
771 procedure Move_Aspects (From : Node_Id; To : Node_Id);
772 -- Relocate the aspect specifications of node From to node To. On entry it
773 -- is assumed that To does not have aspect specifications. If From has no
774 -- aspects, the routine has no effect.
776 procedure Move_Or_Merge_Aspects (From : Node_Id; To : Node_Id);
777 -- Relocate the aspect specifications of node From to node To. If To has
778 -- aspects, the aspects of From are added to the aspects of To. If From has
779 -- no aspects, the routine has no effect.
781 function Permits_Aspect_Specifications (N : Node_Id) return Boolean;
782 -- Returns True if the node N is a declaration node that permits aspect
783 -- specifications in the grammar. It is possible for other nodes to have
784 -- aspect specifications as a result of Rewrite or Replace calls.
786 procedure Remove_Aspects (N : Node_Id);
787 -- Delete the aspect specifications associated with node N. If the node has
788 -- no aspects, the routine has no effect.
790 function Same_Aspect (A1 : Aspect_Id; A2 : Aspect_Id) return Boolean;
791 -- Returns True if A1 and A2 are (essentially) the same aspect. This is not
792 -- a simple equality test because e.g. Post and Postcondition are the same.
793 -- This is used for detecting duplicate aspects.
795 procedure Set_Aspect_Specifications (N : Node_Id; L : List_Id);
796 -- The node N must be in the class of declaration nodes that permit aspect
797 -- specifications and the Has_Aspects flag must be False on entry. L must
798 -- be a non-empty list of N_Aspect_Specification nodes. This procedure sets
799 -- the Has_Aspects flag to True, and makes an entry that can be retrieved
800 -- by a subsequent Aspect_Specifications call. It is an error to call this
801 -- procedure with a node that does not permit aspect specifications, or a
802 -- node that has its Has_Aspects flag set True on entry, or with L being an
803 -- empty list or No_List.
806 -- Reads contents of Aspect_Specifications hash table from the tree file
808 procedure Tree_Write;
809 -- Writes contents of Aspect_Specifications hash table to the tree file
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