1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2023, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Contracts
; use Contracts
;
29 with Einfo
; use Einfo
;
30 with Einfo
.Entities
; use Einfo
.Entities
;
31 with Einfo
.Utils
; use Einfo
.Utils
;
32 with Elists
; use Elists
;
33 with Errout
; use Errout
;
34 with Expander
; use Expander
;
35 with Fname
; use Fname
;
36 with Fname
.UF
; use Fname
.UF
;
37 with Freeze
; use Freeze
;
38 with Ghost
; use Ghost
;
39 with Itypes
; use Itypes
;
41 with Lib
.Load
; use Lib
.Load
;
42 with Lib
.Xref
; use Lib
.Xref
;
43 with Nlists
; use Nlists
;
44 with Namet
; use Namet
;
45 with Nmake
; use Nmake
;
47 with Rident
; use Rident
;
48 with Restrict
; use Restrict
;
49 with Rtsfind
; use Rtsfind
;
51 with Sem_Aux
; use Sem_Aux
;
52 with Sem_Cat
; use Sem_Cat
;
53 with Sem_Ch3
; use Sem_Ch3
;
54 with Sem_Ch6
; use Sem_Ch6
;
55 with Sem_Ch7
; use Sem_Ch7
;
56 with Sem_Ch8
; use Sem_Ch8
;
57 with Sem_Ch10
; use Sem_Ch10
;
58 with Sem_Ch13
; use Sem_Ch13
;
59 with Sem_Dim
; use Sem_Dim
;
60 with Sem_Disp
; use Sem_Disp
;
61 with Sem_Elab
; use Sem_Elab
;
62 with Sem_Elim
; use Sem_Elim
;
63 with Sem_Eval
; use Sem_Eval
;
64 with Sem_Prag
; use Sem_Prag
;
65 with Sem_Res
; use Sem_Res
;
66 with Sem_Type
; use Sem_Type
;
67 with Sem_Util
; use Sem_Util
;
68 with Sem_Warn
; use Sem_Warn
;
69 with Stand
; use Stand
;
70 with Sinfo
; use Sinfo
;
71 with Sinfo
.Nodes
; use Sinfo
.Nodes
;
72 with Sinfo
.Utils
; use Sinfo
.Utils
;
73 with Sinfo
.CN
; use Sinfo
.CN
;
74 with Sinput
; use Sinput
;
75 with Sinput
.L
; use Sinput
.L
;
76 with Snames
; use Snames
;
77 with Stringt
; use Stringt
;
78 with Uname
; use Uname
;
80 with Tbuild
; use Tbuild
;
81 with Uintp
; use Uintp
;
82 with Urealp
; use Urealp
;
83 with Warnsw
; use Warnsw
;
87 package body Sem_Ch12
is
89 ----------------------------------------------------------
90 -- Implementation of Generic Analysis and Instantiation --
91 ----------------------------------------------------------
93 -- GNAT implements generics by macro expansion. No attempt is made to share
94 -- generic instantiations (for now). Analysis of a generic definition does
95 -- not perform any expansion action, but the expander must be called on the
96 -- tree for each instantiation, because the expansion may of course depend
97 -- on the generic actuals. All of this is best achieved as follows:
99 -- a) Semantic analysis of a generic unit is performed on a copy of the
100 -- tree for the generic unit. All tree modifications that follow analysis
101 -- do not affect the original tree. Links are kept between the original
102 -- tree and the copy, in order to recognize non-local references within
103 -- the generic, and propagate them to each instance (recall that name
104 -- resolution is done on the generic declaration: generics are not really
105 -- macros). This is summarized in the following diagram:
107 -- .-----------. .----------.
108 -- | semantic |<--------------| generic |
110 -- | |==============>| |
111 -- |___________| global |__________|
122 -- b) Each instantiation copies the original tree, and inserts into it a
123 -- series of declarations that describe the mapping between generic formals
124 -- and actuals. For example, a generic In OUT parameter is an object
125 -- renaming of the corresponding actual, etc. Generic IN parameters are
126 -- constant declarations.
128 -- c) In order to give the right visibility for these renamings, we use
129 -- a different scheme for package and subprogram instantiations. For
130 -- packages, the list of renamings is inserted into the package
131 -- specification, before the visible declarations of the package. The
132 -- renamings are analyzed before any of the text of the instance, and are
133 -- thus visible at the right place. Furthermore, outside of the instance,
134 -- the generic parameters are visible and denote their corresponding
137 -- For subprograms, we create a container package to hold the renamings
138 -- and the subprogram instance itself. Analysis of the package makes the
139 -- renaming declarations visible to the subprogram. After analyzing the
140 -- package, the defining entity for the subprogram is touched-up so that
141 -- it appears declared in the current scope, and not inside the container
144 -- If the instantiation is a compilation unit, the container package is
145 -- given the same name as the subprogram instance. This ensures that
146 -- the elaboration procedure called by the binder, using the compilation
147 -- unit name, calls in fact the elaboration procedure for the package.
149 -- Not surprisingly, private types complicate this approach. By saving in
150 -- the original generic object the non-local references, we guarantee that
151 -- the proper entities are referenced at the point of instantiation.
152 -- However, for private types, this by itself does not insure that the
153 -- proper VIEW of the entity is used (the full type may be visible at the
154 -- point of generic definition, but not at instantiation, or vice-versa).
155 -- In order to reference the proper view, we special-case any reference
156 -- to private types in the generic object, by saving both views, one in
157 -- the generic and one in the semantic copy. At time of instantiation, we
158 -- check whether the two views are consistent, and exchange declarations if
159 -- necessary, in order to restore the correct visibility. Similarly, if
160 -- the instance view is private when the generic view was not, we perform
161 -- the exchange. After completing the instantiation, we restore the
162 -- current visibility. The flag Has_Private_View marks identifiers in the
163 -- the generic unit that require checking.
165 -- Visibility within nested generic units requires special handling.
166 -- Consider the following scheme:
168 -- type Global is ... -- outside of generic unit.
172 -- type Semi_Global is ... -- global to inner.
175 -- procedure inner (X1 : Global; X2 : Semi_Global);
177 -- procedure in2 is new inner (...); -- 4
180 -- package New_Outer is new Outer (...); -- 2
181 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
183 -- The semantic analysis of Outer captures all occurrences of Global.
184 -- The semantic analysis of Inner (at 1) captures both occurrences of
185 -- Global and Semi_Global.
187 -- At point 2 (instantiation of Outer), we also produce a generic copy
188 -- of Inner, even though Inner is, at that point, not being instantiated.
189 -- (This is just part of the semantic analysis of New_Outer).
191 -- Critically, references to Global within Inner must be preserved, while
192 -- references to Semi_Global should not preserved, because they must now
193 -- resolve to an entity within New_Outer. To distinguish between these, we
194 -- use a global variable, Current_Instantiated_Parent, which is set when
195 -- performing a generic copy during instantiation (at 2). This variable is
196 -- used when performing a generic copy that is not an instantiation, but
197 -- that is nested within one, as the occurrence of 1 within 2. The analysis
198 -- of a nested generic only preserves references that are global to the
199 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
200 -- determine whether a reference is external to the given parent.
202 -- The instantiation at point 3 requires no special treatment. The method
203 -- works as well for further nestings of generic units, but of course the
204 -- variable Current_Instantiated_Parent must be stacked because nested
205 -- instantiations can occur, e.g. the occurrence of 4 within 2.
207 -- The instantiation of package and subprogram bodies is handled in a
208 -- similar manner, except that it is delayed until after semantic
209 -- analysis is complete. In this fashion complex cross-dependencies
210 -- between several package declarations and bodies containing generics
211 -- can be compiled which otherwise would diagnose spurious circularities.
213 -- For example, it is possible to compile two packages A and B that
214 -- have the following structure:
216 -- package A is package B is
217 -- generic ... generic ...
218 -- package G_A is package G_B is
221 -- package body A is package body B is
222 -- package N_B is new G_B (..) package N_A is new G_A (..)
224 -- The table Pending_Instantiations in package Inline is used to keep
225 -- track of body instantiations that are delayed in this manner. Inline
226 -- handles the actual calls to do the body instantiations. This activity
227 -- is part of Inline, since the processing occurs at the same point, and
228 -- for essentially the same reason, as the handling of inlined routines.
230 ----------------------------------------------
231 -- Detection of Instantiation Circularities --
232 ----------------------------------------------
234 -- If we have a chain of instantiations that is circular, this is static
235 -- error which must be detected at compile time. The detection of these
236 -- circularities is carried out at the point that we insert a generic
237 -- instance spec or body. If there is a circularity, then the analysis of
238 -- the offending spec or body will eventually result in trying to load the
239 -- same unit again, and we detect this problem as we analyze the package
240 -- instantiation for the second time.
242 -- At least in some cases after we have detected the circularity, we get
243 -- into trouble if we try to keep going. The following flag is set if a
244 -- circularity is detected, and used to abandon compilation after the
245 -- messages have been posted.
247 Circularity_Detected
: Boolean := False;
248 -- It should really be reset upon encountering a new main unit, but in
249 -- practice we do not use multiple main units so this is not critical.
251 -----------------------------------------
252 -- Implementation of Generic Contracts --
253 -----------------------------------------
255 -- A "contract" is a collection of aspects and pragmas that either verify a
256 -- property of a construct at runtime or classify the data flow to and from
257 -- the construct in some fashion.
259 -- Generic packages, subprograms and their respective bodies may be subject
260 -- to the following contract-related aspects or pragmas collectively known
263 -- package subprogram [body]
264 -- Abstract_State Always_Terminates
265 -- Initial_Condition Contract_Cases
266 -- Initializes Depends
268 -- Extensions_Visible
271 -- Refined_State Post_Class
279 -- Subprogram_Variant
282 -- Most package contract annotations utilize forward references to classify
283 -- data declared within the package [body]. Subprogram annotations then use
284 -- the classifications to further refine them. These inter dependencies are
285 -- problematic with respect to the implementation of generics because their
286 -- analysis, capture of global references and instantiation does not mesh
287 -- well with the existing mechanism.
289 -- 1) Analysis of generic contracts is carried out the same way non-generic
290 -- contracts are analyzed:
292 -- 1.1) General rule - a contract is analyzed after all related aspects
293 -- and pragmas are analyzed. This is done by routines
295 -- Analyze_Package_Body_Contract
296 -- Analyze_Package_Contract
297 -- Analyze_Subprogram_Body_Contract
298 -- Analyze_Subprogram_Contract
300 -- 1.2) Compilation unit - the contract is analyzed after Pragmas_After
303 -- 1.3) Compilation unit body - the contract is analyzed at the end of
304 -- the body declaration list.
306 -- 1.4) Package - the contract is analyzed at the end of the private or
307 -- visible declarations, prior to analyzing the contracts of any nested
308 -- packages or subprograms.
310 -- 1.5) Package body - the contract is analyzed at the end of the body
311 -- declaration list, prior to analyzing the contracts of any nested
312 -- packages or subprograms.
314 -- 1.6) Subprogram - if the subprogram is declared inside a block, a
315 -- package or a subprogram, then its contract is analyzed at the end of
316 -- the enclosing declarations, otherwise the subprogram is a compilation
319 -- 1.7) Subprogram body - if the subprogram body is declared inside a
320 -- block, a package body or a subprogram body, then its contract is
321 -- analyzed at the end of the enclosing declarations, otherwise the
322 -- subprogram is a compilation unit 1.3).
324 -- 2) Capture of global references within contracts is done after capturing
325 -- global references within the generic template. There are two reasons for
326 -- this delay - pragma annotations are not part of the generic template in
327 -- the case of a generic subprogram declaration, and analysis of contracts
330 -- Contract-related source pragmas within generic templates are prepared
331 -- for delayed capture of global references by routine
333 -- Create_Generic_Contract
335 -- The routine associates these pragmas with the contract of the template.
336 -- In the case of a generic subprogram declaration, the routine creates
337 -- generic templates for the pragmas declared after the subprogram because
338 -- they are not part of the template.
340 -- generic -- template starts
341 -- procedure Gen_Proc (Input : Integer); -- template ends
342 -- pragma Precondition (Input > 0); -- requires own template
344 -- 2.1) The capture of global references with aspect specifications and
345 -- source pragmas that apply to a generic unit must be suppressed when
346 -- the generic template is being processed because the contracts have not
347 -- been analyzed yet. Any attempts to capture global references at that
348 -- point will destroy the Associated_Node linkages and leave the template
349 -- undecorated. This delay is controlled by routine
351 -- Requires_Delayed_Save
353 -- 2.2) The real capture of global references within a contract is done
354 -- after the contract has been analyzed, by routine
356 -- Save_Global_References_In_Contract
358 -- 3) The instantiation of a generic contract occurs as part of the
359 -- instantiation of the contract owner. Generic subprogram declarations
360 -- require additional processing when the contract is specified by pragmas
361 -- because the pragmas are not part of the generic template. This is done
364 -- Instantiate_Subprogram_Contract
366 --------------------------------------------------
367 -- Formal packages and partial parameterization --
368 --------------------------------------------------
370 -- When compiling a generic, a formal package is a local instantiation. If
371 -- declared with a box, its generic formals are visible in the enclosing
372 -- generic. If declared with a partial list of actuals, those actuals that
373 -- are defaulted (covered by an Others clause, or given an explicit box
374 -- initialization) are also visible in the enclosing generic, while those
375 -- that have a corresponding actual are not.
377 -- In our source model of instantiation, the same visibility must be
378 -- present in the spec and body of an instance: the names of the formals
379 -- that are defaulted must be made visible within the instance, and made
380 -- invisible (hidden) after the instantiation is complete, so that they
381 -- are not accessible outside of the instance.
383 -- In a generic, a formal package is treated like a special instantiation.
384 -- Our Ada 95 compiler handled formals with and without box in different
385 -- ways. With partial parameterization, we use a single model for both.
386 -- We create a package declaration that consists of the specification of
387 -- the generic package, and a set of declarations that map the actuals
388 -- into local renamings, just as we do for bona fide instantiations. For
389 -- defaulted parameters and formals with a box, we copy directly the
390 -- declarations of the formals into this local package. The result is a
391 -- package whose visible declarations may include generic formals. This
392 -- package is only used for type checking and visibility analysis, and
393 -- never reaches the back end, so it can freely violate the placement
394 -- rules for generic formal declarations.
396 -- The list of declarations (renamings and copies of formals) is built
397 -- by Analyze_Associations, just as for regular instantiations.
399 -- At the point of instantiation, conformance checking must be applied only
400 -- to those parameters that were specified in the formals. We perform this
401 -- checking by creating another internal instantiation, this one including
402 -- only the renamings and the formals (the rest of the package spec is not
403 -- relevant to conformance checking). We can then traverse two lists: the
404 -- list of actuals in the instance that corresponds to the formal package,
405 -- and the list of actuals produced for this bogus instantiation. We apply
406 -- the conformance rules to those actuals that are not defaulted, i.e.
407 -- which still appear as generic formals.
409 -- When we compile an instance body we must make the right parameters
410 -- visible again. The predicate Is_Generic_Formal indicates which of the
411 -- formals should have its Is_Hidden flag reset.
413 -----------------------
414 -- Local subprograms --
415 -----------------------
417 procedure Abandon_Instantiation
(N
: Node_Id
);
418 pragma No_Return
(Abandon_Instantiation
);
419 -- Posts an error message "instantiation abandoned" at the indicated node
420 -- and then raises the exception Instantiation_Error to do it.
422 procedure Analyze_Formal_Array_Type
423 (T
: in out Entity_Id
;
425 -- A formal array type is treated like an array type declaration, and
426 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
427 -- in-out, because in the case of an anonymous type the entity is
428 -- actually created in the procedure.
430 -- The following procedures treat other kinds of formal parameters
432 procedure Analyze_Formal_Derived_Interface_Type
437 procedure Analyze_Formal_Derived_Type
442 procedure Analyze_Formal_Interface_Type
447 -- The following subprograms create abbreviated declarations for formal
448 -- scalar types. We introduce an anonymous base of the proper class for
449 -- each of them, and define the formals as constrained first subtypes of
450 -- their bases. The bounds are expressions that are non-static in the
453 procedure Analyze_Formal_Decimal_Fixed_Point_Type
454 (T
: Entity_Id
; Def
: Node_Id
);
455 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
456 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
457 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
458 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
459 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
460 (T
: Entity_Id
; Def
: Node_Id
);
462 procedure Analyze_Formal_Private_Type
466 -- Creates a new private type, which does not require completion
468 procedure Analyze_Formal_Incomplete_Type
(T
: Entity_Id
; Def
: Node_Id
);
469 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
471 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
472 -- Analyze generic formal part
474 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
475 -- Create a new access type with the given designated type
477 function Analyze_Associations
480 F_Copy
: List_Id
) return List_Id
;
481 -- At instantiation time, build the list of associations between formals
482 -- and actuals. Each association becomes a renaming declaration for the
483 -- formal entity. F_Copy is the analyzed list of formals in the generic
484 -- copy. It is used to apply legality checks to the actuals. I_Node is the
485 -- instantiation node itself.
487 procedure Analyze_Subprogram_Instantiation
491 procedure Build_Instance_Compilation_Unit_Nodes
495 -- This procedure is used in the case where the generic instance of a
496 -- subprogram body or package body is a library unit. In this case, the
497 -- original library unit node for the generic instantiation must be
498 -- replaced by the resulting generic body, and a link made to a new
499 -- compilation unit node for the generic declaration. The argument N is
500 -- the original generic instantiation. Act_Body and Act_Decl are the body
501 -- and declaration of the instance (either package body and declaration
502 -- nodes or subprogram body and declaration nodes depending on the case).
503 -- On return, the node N has been rewritten with the actual body.
505 function Build_Subprogram_Decl_Wrapper
506 (Formal_Subp
: Entity_Id
) return Node_Id
;
507 -- Ada 2022 allows formal subprograms to carry pre/postconditions.
508 -- At the point of instantiation these contracts apply to uses of
509 -- the actual subprogram. This is implemented by creating wrapper
510 -- subprograms instead of the renamings previously used to link
511 -- formal subprograms and the corresponding actuals. If the actual
512 -- is not an entity (e.g. an attribute reference) a renaming is
513 -- created to handle the expansion of the attribute.
515 function Build_Subprogram_Body_Wrapper
516 (Formal_Subp
: Entity_Id
;
517 Actual_Name
: Node_Id
) return Node_Id
;
518 -- The body of the wrapper is a call to the actual, with the generated
519 -- pre/postconditon checks added.
521 procedure Check_Abbreviated_Instance
523 Parent_Installed
: in out Boolean);
524 -- If the name of the generic unit in an abbreviated instantiation is an
525 -- expanded name, then the prefix may be an instance and the selector may
526 -- designate a child unit. If the parent is installed as a result of this
527 -- call, then Parent_Installed is set True, otherwise Parent_Installed is
528 -- unchanged by the call.
530 -- This routine needs to be called for declaration nodes of formal objects,
531 -- types and subprograms to check whether they are the copy, present in the
532 -- visible part of the abbreviated instantiation of formal packages, of the
533 -- declaration node of their corresponding formal parameter in the template
534 -- of the formal package, as specified by RM 12.7(10/2), so as to establish
535 -- the proper context for their analysis.
537 procedure Check_Access_Definition
(N
: Node_Id
);
538 -- Subsidiary routine to null exclusion processing. Perform an assertion
539 -- check on Ada version and the presence of an access definition in N.
541 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
542 -- Apply the following to all formal packages in generic associations.
543 -- Restore the visibility of the formals of the instance that are not
544 -- defaulted (see RM 12.7 (10)). Remove the anonymous package declaration
545 -- created for formal instances that are not defaulted.
547 procedure Check_Formal_Package_Instance
548 (Formal_Pack
: Entity_Id
;
549 Actual_Pack
: Entity_Id
);
550 -- Verify that the actuals of the actual instance match the actuals of
551 -- the template for a formal package that is not declared with a box.
553 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
554 -- If the generic is a local entity and the corresponding body has not
555 -- been seen yet, flag enclosing packages to indicate that it will be
556 -- elaborated after the generic body. Subprograms declared in the same
557 -- package cannot be inlined by the front end because front-end inlining
558 -- requires a strict linear order of elaboration.
560 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
;
561 -- Check if some association between formals and actuals requires to make
562 -- visible primitives of a tagged type, and make those primitives visible.
563 -- Return the list of primitives whose visibility is modified (to restore
564 -- their visibility later through Restore_Hidden_Primitives). If no
565 -- candidate is found then return No_Elist.
567 procedure Check_Hidden_Child_Unit
569 Gen_Unit
: Entity_Id
;
570 Act_Decl_Id
: Entity_Id
);
571 -- If the generic unit is an implicit child instance within a parent
572 -- instance, we need to make an explicit test that it is not hidden by
573 -- a child instance of the same name and parent.
575 procedure Check_Generic_Actuals
576 (Instance
: Entity_Id
;
577 Is_Formal_Box
: Boolean);
578 -- Similar to previous one. Check the actuals in the instantiation,
579 -- whose views can change between the point of instantiation and the point
580 -- of instantiation of the body. In addition, mark the generic renamings
581 -- as generic actuals, so that they are not compatible with other actuals.
582 -- Recurse on an actual that is a formal package whose declaration has
585 function Component_Type_For_Private_View
(T
: Entity_Id
) return Entity_Id
;
586 -- Return the component type of array type T, with the following addition:
587 -- if this component type itself is an array type which has not been first
588 -- declared as private, then recurse on it. This makes it possible to deal
589 -- with arrays of arrays the same way as multi-dimensional arrays in the
590 -- mechanism handling private views.
592 function Contains_Instance_Of
595 N
: Node_Id
) return Boolean;
596 -- Inner is instantiated within the generic Outer. Check whether Inner
597 -- directly or indirectly contains an instance of Outer or of one of its
598 -- parents, in the case of a subunit. Each generic unit holds a list of
599 -- the entities instantiated within (at any depth). This procedure
600 -- determines whether the set of such lists contains a cycle, i.e. an
601 -- illegal circular instantiation.
603 function Denotes_Formal_Package
605 On_Exit
: Boolean := False;
606 Instance
: Entity_Id
:= Empty
) return Boolean;
607 -- Returns True if E is a formal package of an enclosing generic, or
608 -- the actual for such a formal in an enclosing instantiation. If such
609 -- a package is used as a formal in an nested generic, or as an actual
610 -- in a nested instantiation, the visibility of ITS formals should not
611 -- be modified. When called from within Restore_Private_Views, the flag
612 -- On_Exit is true, to indicate that the search for a possible enclosing
613 -- instance should ignore the current one. In that case Instance denotes
614 -- the declaration for which this is an actual. This declaration may be
615 -- an instantiation in the source, or the internal instantiation that
616 -- corresponds to the actual for a formal package.
618 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
619 -- Yields True if N1 and N2 appear in the same compilation unit,
620 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
621 -- traversal of the tree for the unit. Used to determine the placement
622 -- of freeze nodes for instance bodies that may depend on other instances.
624 function Find_Actual_Type
626 Gen_Type
: Entity_Id
) return Entity_Id
;
627 -- When validating the actual types of a child instance, check whether
628 -- the formal is a formal type of the parent unit, and retrieve the current
629 -- actual for it. Typ is the entity in the analyzed formal type declaration
630 -- (component or index type of an array type, or designated type of an
631 -- access formal) and Gen_Type is the enclosing analyzed formal array
632 -- or access type. The desired actual may be a formal of a parent, or may
633 -- be declared in a formal package of a parent. In both cases it is a
634 -- generic actual type because it appears within a visible instance.
635 -- Finally, it may be declared in a parent unit without being a formal
636 -- of that unit, in which case it must be retrieved by visibility.
637 -- Ambiguities may still arise if two homonyms are declared in two formal
638 -- packages, and the prefix of the formal type may be needed to resolve
639 -- the ambiguity in the instance ???
641 procedure Freeze_Package_Instance
646 -- If the instantiation happens textually before the body of the generic,
647 -- the instantiation of the body must be analyzed after the generic body,
648 -- and not at the point of instantiation. Such early instantiations can
649 -- happen if the generic and the instance appear in a package declaration
650 -- because the generic body can only appear in the corresponding package
651 -- body. Early instantiations can also appear if generic, instance and
652 -- body are all in the declarative part of a subprogram or entry. Entities
653 -- of packages that are early instantiations are delayed, and their freeze
654 -- node appears after the generic body. This rather complex machinery is
655 -- needed when nested instantiations are present, because the source does
656 -- not carry any indication of where the corresponding instance bodies must
657 -- be installed and frozen.
659 procedure Freeze_Subprogram_Instance
662 Pack_Id
: Entity_Id
);
663 -- The generic body may appear textually after the instance, including
664 -- in the proper body of a stub, or within a different package instance.
665 -- Given that the instance can only be elaborated after the generic, we
666 -- place freeze nodes for the instance and/or for packages that may enclose
667 -- the instance and the generic, so that the back-end can establish the
668 -- proper order of elaboration.
670 function Get_Associated_Entity
(Id
: Entity_Id
) return Entity_Id
;
671 -- Similar to Get_Associated_Node below, but for entities
673 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
674 -- In order to propagate semantic information back from the analyzed copy
675 -- to the original generic, we maintain links between selected nodes in the
676 -- generic and their corresponding copies. At the end of generic analysis,
677 -- the routine Save_Global_References traverses the generic tree, examines
678 -- the semantic information, and preserves the links to those nodes that
679 -- contain global information. At instantiation, the information from the
680 -- associated node is placed on the new copy, so that name resolution is
683 -- Three kinds of source nodes have associated nodes:
685 -- a) those that can reference (denote) entities, that is identifiers,
686 -- character literals, expanded_names, operator symbols, operators,
687 -- and attribute reference nodes. These nodes have an Entity field
688 -- and are the set of nodes that are in N_Has_Entity.
690 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
692 -- c) selected components (N_Selected_Component)
694 -- For the first class, the associated node preserves the entity if it is
695 -- global. If the generic contains nested instantiations, the associated
696 -- node itself has been recopied, and a chain of them must be followed.
698 -- For aggregates, the associated node allows retrieval of the type, which
699 -- may otherwise not appear in the generic. The view of this type may be
700 -- different between generic and instantiation, and the full view can be
701 -- installed before the instantiation is analyzed. For aggregates of type
702 -- extensions, the same view exchange may have to be performed for some of
703 -- the ancestor types, if their view is private at the point of
706 -- Nodes that are selected components in the parse tree may be rewritten
707 -- as expanded names after resolution, and must be treated as potential
708 -- entity holders, which is why they also have an Associated_Node.
710 -- Nodes that do not come from source, such as freeze nodes, do not appear
711 -- in the generic tree, and need not have an associated node.
713 -- The associated node is stored in the Associated_Node field. Note that
714 -- this field overlaps Entity, which is fine, because the whole point is
715 -- that we don't need or want the normal Entity field in this situation.
717 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
718 -- Traverse the Exchanged_Views list to see if a type was private
719 -- and has already been flipped during this phase of instantiation.
721 function Has_Contracts
(Decl
: Node_Id
) return Boolean;
722 -- Determine whether a formal subprogram has a Pre- or Postcondition,
723 -- in which case a subprogram wrapper has to be built for the actual.
725 procedure Hide_Current_Scope
;
726 -- When instantiating a generic child unit, the parent context must be
727 -- present, but the instance and all entities that may be generated
728 -- must be inserted in the current scope. We leave the current scope
729 -- on the stack, but make its entities invisible to avoid visibility
730 -- problems. This is reversed at the end of the instantiation. This is
731 -- not done for the instantiation of the bodies, which only require the
732 -- instances of the generic parents to be in scope.
734 function In_Main_Context
(E
: Entity_Id
) return Boolean;
735 -- Check whether an instantiation is in the context of the main unit.
736 -- Used to determine whether its body should be elaborated to allow
737 -- front-end inlining.
739 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
740 -- Add the context clause of the unit containing a generic unit to a
741 -- compilation unit that is, or contains, an instantiation.
744 -- Establish environment for subsequent instantiation. Separated from
745 -- Save_Env because data-structures for visibility handling must be
746 -- initialized before call to Check_Generic_Child_Unit.
748 procedure Inline_Instance_Body
750 Gen_Unit
: Entity_Id
;
752 -- If front-end inlining is requested, instantiate the package body,
753 -- and preserve the visibility of its compilation unit, to insure
754 -- that successive instantiations succeed.
756 procedure Insert_Freeze_Node_For_Instance
759 -- N denotes a package or a subprogram instantiation and F_Node is the
760 -- associated freeze node. Insert the freeze node before the first source
761 -- body which follows immediately after N. If no such body is found, the
762 -- freeze node is inserted at the end of the declarative region which
763 -- contains N, unless the instantiation is done in a package spec that is
764 -- not at library level, in which case it is inserted at the outer level.
765 -- This can also be invoked to insert the freeze node of a package that
766 -- encloses an instantiation, in which case N may denote an arbitrary node.
768 procedure Install_Formal_Packages
(Par
: Entity_Id
);
769 -- Install the visible part of any formal of the parent that is a formal
770 -- package. Note that for the case of a formal package with a box, this
771 -- includes the formal part of the formal package (12.7(10/2)).
773 procedure Install_Hidden_Primitives
774 (Prims_List
: in out Elist_Id
;
777 -- Remove suffix 'P' from hidden primitives of Act_T to match the
778 -- visibility of primitives of Gen_T. The list of primitives to which
779 -- the suffix is removed is added to Prims_List to restore them later.
781 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
782 -- When compiling an instance of a child unit the parent (which is
783 -- itself an instance) is an enclosing scope that must be made
784 -- immediately visible. This procedure is also used to install the non-
785 -- generic parent of a generic child unit when compiling its body, so
786 -- that full views of types in the parent are made visible.
788 -- The functions Instantiate_XXX perform various legality checks and build
789 -- the declarations for instantiated generic parameters. In all of these
790 -- Formal is the entity in the generic unit, Actual is the entity of
791 -- expression in the generic associations, and Analyzed_Formal is the
792 -- formal in the generic copy, which contains the semantic information to
793 -- be used to validate the actual.
795 function Instantiate_Object
798 Analyzed_Formal
: Node_Id
) return List_Id
;
800 function Instantiate_Type
803 Analyzed_Formal
: Node_Id
;
804 Actual_Decls
: List_Id
) return List_Id
;
806 function Instantiate_Formal_Subprogram
809 Analyzed_Formal
: Node_Id
) return Node_Id
;
811 function Instantiate_Formal_Package
814 Analyzed_Formal
: Node_Id
) return List_Id
;
815 -- If the formal package is declared with a box, special visibility rules
816 -- apply to its formals: they are in the visible part of the package. This
817 -- is true in the declarative region of the formal package, that is to say
818 -- in the enclosing generic or instantiation. For an instantiation, the
819 -- parameters of the formal package are made visible in an explicit step.
820 -- Furthermore, if the actual has a visible USE clause, these formals must
821 -- be made potentially use-visible as well. On exit from the enclosing
822 -- instantiation, the reverse must be done.
824 -- For a formal package declared without a box, there are conformance rules
825 -- that apply to the actuals in the generic declaration and the actuals of
826 -- the actual package in the enclosing instantiation. The simplest way to
827 -- apply these rules is to repeat the instantiation of the formal package
828 -- in the context of the enclosing instance, and compare the generic
829 -- associations of this instantiation with those of the actual package.
830 -- This internal instantiation only needs to contain the renamings of the
831 -- formals: the visible and private declarations themselves need not be
834 -- In Ada 2005, the formal package may be only partially parameterized.
835 -- In that case the visibility step must make visible those actuals whose
836 -- corresponding formals were given with a box. A final complication
837 -- involves inherited operations from formal derived types, which must
838 -- be visible if the type is.
840 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
841 -- Test if given node is in the main unit
843 procedure Load_Parent_Of_Generic
846 Body_Optional
: Boolean := False);
847 -- If the generic appears in a separate non-generic library unit, load the
848 -- corresponding body to retrieve the body of the generic. N is the node
849 -- for the generic instantiation, Spec is the generic package declaration.
851 -- Body_Optional is a flag that indicates that the body is being loaded to
852 -- ensure that temporaries are generated consistently when there are other
853 -- instances in the current declarative part that precede the one being
854 -- loaded. In that case a missing body is acceptable.
856 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
857 -- Within the generic part, entities in the formal package are
858 -- visible. To validate subsequent type declarations, indicate
859 -- the correspondence between the entities in the analyzed formal,
860 -- and the entities in the actual package. There are three packages
861 -- involved in the instantiation of a formal package: the parent
862 -- generic P1 which appears in the generic declaration, the fake
863 -- instantiation P2 which appears in the analyzed generic, and whose
864 -- visible entities may be used in subsequent formals, and the actual
865 -- P3 in the instance. To validate subsequent formals, me indicate
866 -- that the entities in P2 are mapped into those of P3. The mapping of
867 -- entities has to be done recursively for nested packages.
869 procedure Move_Freeze_Nodes
873 -- Freeze nodes can be generated in the analysis of a generic unit, but
874 -- will not be seen by the back-end. It is necessary to move those nodes
875 -- to the enclosing scope if they freeze an outer entity. We place them
876 -- at the end of the enclosing generic package, which is semantically
879 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
);
880 -- Analyze actuals to perform name resolution. Full resolution is done
881 -- later, when the expected types are known, but names have to be captured
882 -- before installing parents of generics, that are not visible for the
883 -- actuals themselves.
885 -- If Inst is present, it is the entity of the package instance. This
886 -- entity is marked as having a limited_view actual when some actual is
887 -- a limited view. This is used to place the instance body properly.
889 procedure Provide_Completing_Bodies
(N
: Node_Id
);
890 -- Generate completing bodies for all subprograms found within package or
891 -- subprogram declaration N.
893 procedure Remove_Parent
(In_Body
: Boolean := False);
894 -- Reverse effect after instantiation of child is complete
896 function Requires_Conformance_Checking
(N
: Node_Id
) return Boolean;
897 -- Determine whether the formal package declaration N requires conformance
898 -- checking with actuals in instantiations.
900 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
901 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
904 procedure Set_Instance_Env
905 (Gen_Unit
: Entity_Id
;
906 Act_Unit
: Entity_Id
);
907 -- Save current instance on saved environment, to be used to determine
908 -- the global status of entities in nested instances. Part of Save_Env.
909 -- called after verifying that the generic unit is legal for the instance,
910 -- The procedure also examines whether the generic unit is a predefined
911 -- unit, in order to set configuration switches accordingly. As a result
912 -- the procedure must be called after analyzing and freezing the actuals.
914 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
915 -- Associate analyzed generic parameter with corresponding instance. Used
916 -- for semantic checks at instantiation time.
918 function True_Parent
(N
: Node_Id
) return Node_Id
;
919 -- For a subunit, return parent of corresponding stub, else return
922 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
923 -- Verify that an attribute that appears as the default for a formal
924 -- subprogram is a function or procedure with the correct profile.
926 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
);
927 -- Ada_2022 AI12-205: if a default subtype_mark is present, verify
928 -- that it is the name of a type in the same class as the formal.
929 -- The treatment parallels what is done in Instantiate_Type but differs
930 -- in a few ways so that this machinery cannot be reused as is: on one
931 -- hand there are no visibility issues for a default, because it is
932 -- analyzed in the same context as the formal type definition; on the
933 -- other hand the check needs to take into acount the use of a previous
934 -- formal type in the current formal type definition (see details in
937 -------------------------------------------
938 -- Data Structures for Generic Renamings --
939 -------------------------------------------
941 -- The map Generic_Renamings associates generic entities with their
942 -- corresponding actuals. Currently used to validate type instances. It
943 -- will eventually be used for all generic parameters to eliminate the
944 -- need for overload resolution in the instance.
946 type Assoc_Ptr
is new Int
;
948 Assoc_Null
: constant Assoc_Ptr
:= -1;
953 Next_In_HTable
: Assoc_Ptr
;
956 package Generic_Renamings
is new Table
.Table
957 (Table_Component_Type
=> Assoc
,
958 Table_Index_Type
=> Assoc_Ptr
,
959 Table_Low_Bound
=> 0,
961 Table_Increment
=> 100,
962 Table_Name
=> "Generic_Renamings");
964 -- Variable to hold enclosing instantiation. When the environment is
965 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
967 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
969 -- Hash table for associations
971 HTable_Size
: constant := 37;
972 type HTable_Range
is range 0 .. HTable_Size
- 1;
974 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
975 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
976 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
977 function Hash
(F
: Entity_Id
) return HTable_Range
;
979 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
980 Header_Num
=> HTable_Range
,
982 Elmt_Ptr
=> Assoc_Ptr
,
983 Null_Ptr
=> Assoc_Null
,
984 Set_Next
=> Set_Next_Assoc
,
987 Get_Key
=> Get_Gen_Id
,
991 Exchanged_Views
: Elist_Id
;
992 -- This list holds the private views that have been exchanged during
993 -- instantiation to restore the visibility of the generic declaration.
994 -- (see comments above). After instantiation, the current visibility is
995 -- reestablished by means of a traversal of this list.
997 Hidden_Entities
: Elist_Id
;
998 -- This list holds the entities of the current scope that are removed
999 -- from immediate visibility when instantiating a child unit. Their
1000 -- visibility is restored in Remove_Parent.
1002 -- Because instantiations can be recursive, the following must be saved
1003 -- on entry and restored on exit from an instantiation (spec or body).
1004 -- This is done by the two procedures Save_Env and Restore_Env. For
1005 -- package and subprogram instantiations (but not for the body instances)
1006 -- the action of Save_Env is done in two steps: Init_Env is called before
1007 -- Check_Generic_Child_Unit, because setting the parent instances requires
1008 -- that the visibility data structures be properly initialized. Once the
1009 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
1011 Parent_Unit_Visible
: Boolean := False;
1012 -- Parent_Unit_Visible is used when the generic is a child unit, and
1013 -- indicates whether the ultimate parent of the generic is visible in the
1014 -- instantiation environment. It is used to reset the visibility of the
1015 -- parent at the end of the instantiation (see Remove_Parent).
1017 Instance_Parent_Unit
: Entity_Id
:= Empty
;
1018 -- This records the ultimate parent unit of an instance of a generic
1019 -- child unit and is used in conjunction with Parent_Unit_Visible to
1020 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
1022 type Instance_Env
is record
1023 Instantiated_Parent
: Assoc
;
1024 Exchanged_Views
: Elist_Id
;
1025 Hidden_Entities
: Elist_Id
;
1026 Current_Sem_Unit
: Unit_Number_Type
;
1027 Parent_Unit_Visible
: Boolean := False;
1028 Instance_Parent_Unit
: Entity_Id
:= Empty
;
1029 Switches
: Config_Switches_Type
;
1032 package Instance_Envs
is new Table
.Table
(
1033 Table_Component_Type
=> Instance_Env
,
1034 Table_Index_Type
=> Int
,
1035 Table_Low_Bound
=> 0,
1036 Table_Initial
=> 32,
1037 Table_Increment
=> 100,
1038 Table_Name
=> "Instance_Envs");
1040 procedure Restore_Private_Views
1041 (Pack_Id
: Entity_Id
;
1042 Is_Package
: Boolean := True);
1043 -- Restore the private views of external types, and unmark the generic
1044 -- renamings of actuals, so that they become compatible subtypes again.
1045 -- For subprograms, Pack_Id is the package constructed to hold the
1048 procedure Switch_View
(T
: Entity_Id
);
1049 -- Switch the partial and full views of a type and its private
1050 -- dependents (i.e. its subtypes and derived types).
1052 ------------------------------------
1053 -- Structures for Error Reporting --
1054 ------------------------------------
1056 Instantiation_Node
: Node_Id
;
1057 -- Used by subprograms that validate instantiation of formal parameters
1058 -- where there might be no actual on which to place the error message.
1059 -- Also used to locate the instantiation node for generic subunits.
1061 Instantiation_Error
: exception;
1062 -- When there is a semantic error in the generic parameter matching,
1063 -- there is no point in continuing the instantiation, because the
1064 -- number of cascaded errors is unpredictable. This exception aborts
1065 -- the instantiation process altogether.
1067 S_Adjustment
: Sloc_Adjustment
;
1068 -- Offset created for each node in an instantiation, in order to keep
1069 -- track of the source position of the instantiation in each of its nodes.
1070 -- A subsequent semantic error or warning on a construct of the instance
1071 -- points to both places: the original generic node, and the point of
1072 -- instantiation. See Sinput and Sinput.L for additional details.
1074 ------------------------------------------------------------
1075 -- Data structure for keeping track when inside a Generic --
1076 ------------------------------------------------------------
1078 -- The following table is used to save values of the Inside_A_Generic
1079 -- flag (see spec of Sem) when they are saved by Start_Generic.
1081 package Generic_Flags
is new Table
.Table
(
1082 Table_Component_Type
=> Boolean,
1083 Table_Index_Type
=> Int
,
1084 Table_Low_Bound
=> 0,
1085 Table_Initial
=> 32,
1086 Table_Increment
=> 200,
1087 Table_Name
=> "Generic_Flags");
1089 ---------------------------
1090 -- Abandon_Instantiation --
1091 ---------------------------
1093 procedure Abandon_Instantiation
(N
: Node_Id
) is
1095 Error_Msg_N
("\instantiation abandoned!", N
);
1096 raise Instantiation_Error
;
1097 end Abandon_Instantiation
;
1099 ----------------------------------
1100 -- Adjust_Inherited_Pragma_Sloc --
1101 ----------------------------------
1103 procedure Adjust_Inherited_Pragma_Sloc
(N
: Node_Id
) is
1105 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1106 end Adjust_Inherited_Pragma_Sloc
;
1108 --------------------------
1109 -- Analyze_Associations --
1110 --------------------------
1112 function Analyze_Associations
1115 F_Copy
: List_Id
) return List_Id
1117 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
1118 Assoc_List
: constant List_Id
:= New_List
;
1119 Default_Actuals
: constant List_Id
:= New_List
;
1120 Gen_Unit
: constant Entity_Id
:=
1121 Defining_Entity
(Parent
(F_Copy
));
1125 Analyzed_Formal
: Node_Id
;
1126 First_Named
: Node_Id
:= Empty
;
1128 Match
: Node_Id
:= Empty
;
1130 Saved_Formal
: Node_Id
;
1132 Default_Formals
: constant List_Id
:= New_List
;
1133 -- If an Others_Choice is present, some of the formals may be defaulted.
1134 -- To simplify the treatment of visibility in an instance, we introduce
1135 -- individual defaults for each such formal. These defaults are
1136 -- appended to the list of associations and replace the Others_Choice.
1138 Found_Assoc
: Node_Id
;
1139 -- Association for the current formal being match. Empty if there are
1140 -- no remaining actuals, or if there is no named association with the
1141 -- name of the formal.
1143 Is_Named_Assoc
: Boolean;
1144 Num_Matched
: Nat
:= 0;
1145 Num_Actuals
: Nat
:= 0;
1147 Others_Present
: Boolean := False;
1148 Others_Choice
: Node_Id
:= Empty
;
1149 -- In Ada 2005, indicates partial parameterization of a formal
1150 -- package. As usual an other association must be last in the list.
1152 procedure Build_Subprogram_Wrappers
;
1153 -- Ada 2022: AI12-0272 introduces pre/postconditions for formal
1154 -- subprograms. The implementation of making the formal into a renaming
1155 -- of the actual does not work, given that subprogram renaming cannot
1156 -- carry aspect specifications. Instead we must create subprogram
1157 -- wrappers whose body is a call to the actual, and whose declaration
1158 -- carries the aspects of the formal.
1160 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
);
1161 -- Warn if an actual fixed-point type has user-defined arithmetic
1162 -- operations, but there is no corresponding formal in the generic,
1163 -- in which case the predefined operations will be used. This merits
1164 -- a warning because of the special semantics of fixed point ops.
1166 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Node_Id
);
1167 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1168 -- cannot have a named association for it. AI05-0025 extends this rule
1169 -- to formals of formal packages by AI05-0025, and it also applies to
1170 -- box-initialized formals.
1172 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
1173 -- Determine whether the parameter types and the return type of Subp
1174 -- are fully defined at the point of instantiation.
1176 function Matching_Actual
1178 A_F
: Entity_Id
) return Node_Id
;
1179 -- Find actual that corresponds to a given formal parameter. If the
1180 -- actuals are positional, return the next one, if any. If the actuals
1181 -- are named, scan the parameter associations to find the right one.
1182 -- A_F is the corresponding entity in the analyzed generic, which is
1183 -- placed on the selector name.
1185 -- In Ada 2005, a named association may be given with a box, in which
1186 -- case Matching_Actual sets Found_Assoc to the generic association,
1187 -- but return Empty for the actual itself. In this case the code below
1188 -- creates a corresponding declaration for the formal.
1190 function Partial_Parameterization
return Boolean;
1191 -- Ada 2005: if no match is found for a given formal, check if the
1192 -- association for it includes a box, or whether the associations
1193 -- include an Others clause.
1195 procedure Process_Default
(Formal
: Node_Id
);
1196 -- Add a copy of the declaration of a generic formal to the list of
1197 -- associations, and add an explicit box association for its entity
1198 -- if there is none yet, and the default comes from an Others_Choice.
1200 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1201 -- Determine whether Subp renames one of the subprograms defined in the
1202 -- generated package Standard.
1204 procedure Set_Analyzed_Formal
;
1205 -- Find the node in the generic copy that corresponds to a given formal.
1206 -- The semantic information on this node is used to perform legality
1207 -- checks on the actuals. Because semantic analysis can introduce some
1208 -- anonymous entities or modify the declaration node itself, the
1209 -- correspondence between the two lists is not one-one. In addition to
1210 -- anonymous types, the presence a formal equality will introduce an
1211 -- implicit declaration for the corresponding inequality.
1213 -------------------------------
1214 -- Build_Subprogram_Wrappers --
1215 -------------------------------
1217 procedure Build_Subprogram_Wrappers
is
1218 function Adjust_Aspect_Sloc
(N
: Node_Id
) return Traverse_Result
;
1219 -- Adjust sloc so that errors located at N will be reported with
1220 -- information about the instance and not just about the generic.
1222 ------------------------
1223 -- Adjust_Aspect_Sloc --
1224 ------------------------
1226 function Adjust_Aspect_Sloc
(N
: Node_Id
) return Traverse_Result
is
1228 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1230 end Adjust_Aspect_Sloc
;
1232 procedure Adjust_Aspect_Slocs
is new
1233 Traverse_Proc
(Adjust_Aspect_Sloc
);
1235 Formal
: constant Entity_Id
:=
1236 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
1237 Aspect_Spec
: Node_Id
;
1238 Decl_Node
: Node_Id
;
1239 Actual_Name
: Node_Id
;
1241 -- Start of processing for Build_Subprogram_Wrappers
1244 -- Create declaration for wrapper subprogram
1245 -- The actual can be overloaded, in which case it will be
1246 -- resolved when the call in the wrapper body is analyzed.
1247 -- We attach the possible interpretations of the actual to
1248 -- the name to be used in the call in the wrapper body.
1250 if Is_Entity_Name
(Match
) then
1251 Actual_Name
:= New_Occurrence_Of
(Entity
(Match
), Sloc
(Match
));
1253 if Is_Overloaded
(Match
) then
1254 Save_Interps
(Match
, Actual_Name
);
1258 -- Use renaming declaration created when analyzing actual.
1259 -- This may be incomplete if there are several formal
1260 -- subprograms whose actual is an attribute ???
1263 Renaming_Decl
: constant Node_Id
:= Last
(Assoc_List
);
1266 Actual_Name
:= New_Occurrence_Of
1267 (Defining_Entity
(Renaming_Decl
), Sloc
(Match
));
1268 Set_Etype
(Actual_Name
, Get_Instance_Of
(Etype
(Formal
)));
1272 Decl_Node
:= Build_Subprogram_Decl_Wrapper
(Formal
);
1274 -- Transfer aspect specifications from formal subprogram to wrapper
1276 Set_Aspect_Specifications
(Decl_Node
,
1277 New_Copy_List_Tree
(Aspect_Specifications
(Analyzed_Formal
)));
1279 Aspect_Spec
:= First
(Aspect_Specifications
(Decl_Node
));
1280 while Present
(Aspect_Spec
) loop
1281 Adjust_Aspect_Slocs
(Aspect_Spec
);
1282 Set_Analyzed
(Aspect_Spec
, False);
1286 Append_To
(Assoc_List
, Decl_Node
);
1288 -- Create corresponding body, and append it to association list
1289 -- that appears at the head of the declarations in the instance.
1290 -- The subprogram may be called in the analysis of subsequent
1293 Append_To
(Assoc_List
,
1294 Build_Subprogram_Body_Wrapper
(Formal
, Actual_Name
));
1295 end Build_Subprogram_Wrappers
;
1297 ----------------------------------------
1298 -- Check_Overloaded_Formal_Subprogram --
1299 ----------------------------------------
1301 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Node_Id
) is
1302 Temp_Formal
: Node_Id
;
1305 Temp_Formal
:= First
(Formals
);
1306 while Present
(Temp_Formal
) loop
1307 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1308 and then Temp_Formal
/= Formal
1310 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1311 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1313 if Present
(Found_Assoc
) then
1315 ("named association not allowed for overloaded formal",
1320 ("named association not allowed for overloaded formal",
1324 Abandon_Instantiation
(Instantiation_Node
);
1329 end Check_Overloaded_Formal_Subprogram
;
1331 -------------------------------
1332 -- Check_Fixed_Point_Actual --
1333 -------------------------------
1335 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
) is
1336 Typ
: constant Entity_Id
:= Entity
(Actual
);
1337 Prims
: constant Elist_Id
:= Collect_Primitive_Operations
(Typ
);
1343 -- Locate primitive operations of the type that are arithmetic
1346 Elem
:= First_Elmt
(Prims
);
1347 while Present
(Elem
) loop
1348 if Nkind
(Node
(Elem
)) = N_Defining_Operator_Symbol
then
1350 -- Check whether the generic unit has a formal subprogram of
1351 -- the same name. This does not check types but is good enough
1352 -- to justify a warning.
1354 Formal
:= First_Non_Pragma
(Formals
);
1355 Op
:= Alias
(Node
(Elem
));
1357 while Present
(Formal
) loop
1358 if Nkind
(Formal
) = N_Formal_Concrete_Subprogram_Declaration
1359 and then Chars
(Defining_Entity
(Formal
)) =
1364 elsif Nkind
(Formal
) = N_Formal_Package_Declaration
then
1370 -- Locate corresponding actual, and check whether it
1371 -- includes a fixed-point type.
1373 Assoc
:= First
(Assoc_List
);
1374 while Present
(Assoc
) loop
1376 Nkind
(Assoc
) = N_Package_Renaming_Declaration
1377 and then Chars
(Defining_Unit_Name
(Assoc
)) =
1378 Chars
(Defining_Identifier
(Formal
));
1383 if Present
(Assoc
) then
1385 -- If formal package declares a fixed-point type,
1386 -- and the user-defined operator is derived from
1387 -- a generic instance package, the fixed-point type
1388 -- does not use the corresponding predefined op.
1390 Ent
:= First_Entity
(Entity
(Name
(Assoc
)));
1391 while Present
(Ent
) loop
1392 if Is_Fixed_Point_Type
(Ent
)
1393 and then Present
(Op
)
1394 and then Is_Generic_Instance
(Scope
(Op
))
1409 Error_Msg_Sloc
:= Sloc
(Node
(Elem
));
1411 ("?instance uses predefined operation, not primitive "
1412 & "operation&#", Actual
, Node
(Elem
));
1418 end Check_Fixed_Point_Actual
;
1420 -------------------------------
1421 -- Has_Fully_Defined_Profile --
1422 -------------------------------
1424 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1425 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1426 -- Determine whethet type Typ is fully defined
1428 ---------------------------
1429 -- Is_Fully_Defined_Type --
1430 ---------------------------
1432 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1434 -- A private type without a full view is not fully defined
1436 if Is_Private_Type
(Typ
)
1437 and then No
(Full_View
(Typ
))
1441 -- An incomplete type is never fully defined
1443 elsif Is_Incomplete_Type
(Typ
) then
1446 -- All other types are fully defined
1451 end Is_Fully_Defined_Type
;
1453 -- Local declarations
1457 -- Start of processing for Has_Fully_Defined_Profile
1460 -- Check the parameters
1462 Param
:= First_Formal
(Subp
);
1463 while Present
(Param
) loop
1464 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1468 Next_Formal
(Param
);
1471 -- Check the return type
1473 return Is_Fully_Defined_Type
(Etype
(Subp
));
1474 end Has_Fully_Defined_Profile
;
1476 ---------------------
1477 -- Matching_Actual --
1478 ---------------------
1480 function Matching_Actual
1482 A_F
: Entity_Id
) return Node_Id
1488 Is_Named_Assoc
:= False;
1490 -- End of list of purely positional parameters
1492 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1493 Found_Assoc
:= Empty
;
1496 -- Case of positional parameter corresponding to current formal
1498 elsif No
(Selector_Name
(Actual
)) then
1499 Found_Assoc
:= Actual
;
1500 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1501 Num_Matched
:= Num_Matched
+ 1;
1504 -- Otherwise scan list of named actuals to find the one with the
1505 -- desired name. All remaining actuals have explicit names.
1508 Is_Named_Assoc
:= True;
1509 Found_Assoc
:= Empty
;
1513 while Present
(Actual
) loop
1514 if Nkind
(Actual
) = N_Others_Choice
then
1515 Found_Assoc
:= Empty
;
1518 elsif Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1519 Set_Entity
(Selector_Name
(Actual
), A_F
);
1520 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1521 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1523 Found_Assoc
:= Actual
;
1524 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1525 Num_Matched
:= Num_Matched
+ 1;
1533 -- Reset for subsequent searches. In most cases the named
1534 -- associations are in order. If they are not, we reorder them
1535 -- to avoid scanning twice the same actual. This is not just a
1536 -- question of efficiency: there may be multiple defaults with
1537 -- boxes that have the same name. In a nested instantiation we
1538 -- insert actuals for those defaults, and cannot rely on their
1539 -- names to disambiguate them.
1541 if Actual
= First_Named
then
1544 elsif Present
(Actual
) then
1545 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1548 Actual
:= First_Named
;
1551 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1552 Set_Used_As_Generic_Actual
(Entity
(Act
));
1556 end Matching_Actual
;
1558 ------------------------------
1559 -- Partial_Parameterization --
1560 ------------------------------
1562 function Partial_Parameterization
return Boolean is
1564 return Others_Present
1565 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1566 end Partial_Parameterization
;
1568 ---------------------
1569 -- Process_Default --
1570 ---------------------
1572 procedure Process_Default
(Formal
: Node_Id
) is
1573 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1574 F_Id
: constant Entity_Id
:= Defining_Entity
(Formal
);
1580 -- Append copy of formal declaration to associations, and create new
1581 -- defining identifier for it.
1583 Decl
:= New_Copy_Tree
(Formal
);
1584 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1586 if Nkind
(Formal
) in N_Formal_Subprogram_Declaration
then
1587 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1590 Set_Defining_Identifier
(Decl
, Id
);
1593 Append
(Decl
, Assoc_List
);
1595 if No
(Found_Assoc
) then
1597 Make_Generic_Association
(Loc
,
1599 New_Occurrence_Of
(Id
, Loc
),
1600 Explicit_Generic_Actual_Parameter
=> Empty
);
1601 Set_Box_Present
(Default
);
1602 Append
(Default
, Default_Formals
);
1604 end Process_Default
;
1606 ---------------------------------
1607 -- Renames_Standard_Subprogram --
1608 ---------------------------------
1610 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1615 while Present
(Id
) loop
1616 if Scope
(Id
) = Standard_Standard
then
1624 end Renames_Standard_Subprogram
;
1626 -------------------------
1627 -- Set_Analyzed_Formal --
1628 -------------------------
1630 procedure Set_Analyzed_Formal
is
1634 while Present
(Analyzed_Formal
) loop
1635 Kind
:= Nkind
(Analyzed_Formal
);
1637 case Nkind
(Formal
) is
1638 when N_Formal_Subprogram_Declaration
=>
1639 exit when Kind
in N_Formal_Subprogram_Declaration
1642 (Defining_Unit_Name
(Specification
(Formal
))) =
1644 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1646 when N_Formal_Package_Declaration
=>
1647 exit when Kind
in N_Formal_Package_Declaration
1648 | N_Generic_Package_Declaration
1649 | N_Package_Declaration
;
1651 when N_Use_Package_Clause
1658 -- Skip freeze nodes, and nodes inserted to replace
1659 -- unrecognized pragmas.
1662 Kind
not in N_Formal_Subprogram_Declaration
1663 and then Kind
not in N_Subprogram_Declaration
1667 and then Chars
(Defining_Identifier
(Formal
)) =
1668 Chars
(Defining_Identifier
(Analyzed_Formal
));
1671 Next
(Analyzed_Formal
);
1673 end Set_Analyzed_Formal
;
1675 -- Start of processing for Analyze_Associations
1678 Actuals
:= Generic_Associations
(I_Node
);
1680 if Present
(Actuals
) then
1682 -- Check for an Others choice, indicating a partial parameterization
1683 -- for a formal package.
1685 Actual
:= First
(Actuals
);
1686 while Present
(Actual
) loop
1687 if Nkind
(Actual
) = N_Others_Choice
then
1688 Others_Present
:= True;
1689 Others_Choice
:= Actual
;
1691 if Present
(Next
(Actual
)) then
1692 Error_Msg_N
("OTHERS must be last association", Actual
);
1695 -- This subprogram is used both for formal packages and for
1696 -- instantiations. For the latter, associations must all be
1699 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1700 and then Comes_From_Source
(I_Node
)
1703 ("OTHERS association not allowed in an instance",
1707 -- In any case, nothing to do after the others association
1711 elsif Box_Present
(Actual
)
1712 and then Comes_From_Source
(I_Node
)
1713 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1716 ("box association not allowed in an instance", Actual
);
1722 -- If named associations are present, save first named association
1723 -- (it may of course be Empty) to facilitate subsequent name search.
1725 First_Named
:= First
(Actuals
);
1726 while Present
(First_Named
)
1727 and then Nkind
(First_Named
) /= N_Others_Choice
1728 and then No
(Selector_Name
(First_Named
))
1730 Num_Actuals
:= Num_Actuals
+ 1;
1735 Named
:= First_Named
;
1736 while Present
(Named
) loop
1737 if Nkind
(Named
) /= N_Others_Choice
1738 and then No
(Selector_Name
(Named
))
1740 Error_Msg_N
("invalid positional actual after named one", Named
);
1741 Abandon_Instantiation
(Named
);
1744 -- A named association may lack an actual parameter, if it was
1745 -- introduced for a default subprogram that turns out to be local
1746 -- to the outer instantiation. If it has a box association it must
1747 -- correspond to some formal in the generic.
1749 if Nkind
(Named
) /= N_Others_Choice
1750 and then (Present
(Explicit_Generic_Actual_Parameter
(Named
))
1751 or else Box_Present
(Named
))
1753 Num_Actuals
:= Num_Actuals
+ 1;
1759 if Present
(Formals
) then
1760 Formal
:= First_Non_Pragma
(Formals
);
1761 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1763 if Present
(Actuals
) then
1764 Actual
:= First
(Actuals
);
1766 -- All formals should have default values
1772 while Present
(Formal
) loop
1773 Set_Analyzed_Formal
;
1774 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1776 case Nkind
(Formal
) is
1777 when N_Formal_Object_Declaration
=>
1780 (Defining_Identifier
(Formal
),
1781 Defining_Identifier
(Analyzed_Formal
));
1783 if No
(Match
) and then Partial_Parameterization
then
1784 Process_Default
(Formal
);
1788 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1791 -- For a defaulted in_parameter, create an entry in the
1792 -- the list of defaulted actuals, for GNATprove use. Do
1793 -- not included these defaults for an instance nested
1794 -- within a generic, because the defaults are also used
1795 -- in the analysis of the enclosing generic, and only
1796 -- defaulted subprograms are relevant there.
1798 if No
(Match
) and then not Inside_A_Generic
then
1799 Append_To
(Default_Actuals
,
1800 Make_Generic_Association
(Sloc
(I_Node
),
1803 (Defining_Identifier
(Formal
), Sloc
(I_Node
)),
1804 Explicit_Generic_Actual_Parameter
=>
1805 New_Copy_Tree
(Default_Expression
(Formal
))));
1809 -- If the object is a call to an expression function, this
1810 -- is a freezing point for it.
1812 if Is_Entity_Name
(Match
)
1813 and then Present
(Entity
(Match
))
1815 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1816 = N_Expression_Function
1818 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1821 when N_Formal_Type_Declaration
=>
1824 (Defining_Identifier
(Formal
),
1825 Defining_Identifier
(Analyzed_Formal
));
1828 if Partial_Parameterization
then
1829 Process_Default
(Formal
);
1831 elsif Present
(Default_Subtype_Mark
(Formal
)) then
1832 Match
:= New_Copy
(Default_Subtype_Mark
(Formal
));
1835 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1837 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1840 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1843 Instantiation_Node
, Defining_Identifier
(Formal
));
1845 ("\in instantiation of & declared#",
1846 Instantiation_Node
, Gen_Unit
);
1847 Abandon_Instantiation
(Instantiation_Node
);
1854 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1857 -- Warn when an actual is a fixed-point with user-
1858 -- defined promitives. The warning is superfluous
1859 -- if the formal is private, because there can be
1860 -- no arithmetic operations in the generic so there
1861 -- no danger of confusion.
1863 if Is_Fixed_Point_Type
(Entity
(Match
))
1864 and then not Is_Private_Type
1865 (Defining_Identifier
(Analyzed_Formal
))
1867 Check_Fixed_Point_Actual
(Match
);
1870 -- An instantiation is a freeze point for the actuals,
1871 -- unless this is a rewritten formal package, or the
1872 -- formal is an Ada 2012 formal incomplete type.
1874 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1876 (Ada_Version
>= Ada_2012
1878 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1884 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1888 -- A remote access-to-class-wide type is not a legal actual
1889 -- for a generic formal of an access type (E.2.2(17/2)).
1890 -- In GNAT an exception to this rule is introduced when
1891 -- the formal is marked as remote using implementation
1892 -- defined aspect/pragma Remote_Access_Type. In that case
1893 -- the actual must be remote as well.
1895 -- If the current instantiation is the construction of a
1896 -- local copy for a formal package the actuals may be
1897 -- defaulted, and there is no matching actual to check.
1899 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1901 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1902 N_Access_To_Object_Definition
1903 and then Present
(Match
)
1906 Formal_Ent
: constant Entity_Id
:=
1907 Defining_Identifier
(Analyzed_Formal
);
1909 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1910 = Is_Remote_Types
(Formal_Ent
)
1912 -- Remoteness of formal and actual match
1916 elsif Is_Remote_Types
(Formal_Ent
) then
1918 -- Remote formal, non-remote actual
1921 ("actual for& must be remote", Match
, Formal_Ent
);
1924 -- Non-remote formal, remote actual
1927 ("actual for& may not be remote",
1933 when N_Formal_Subprogram_Declaration
=>
1936 (Defining_Unit_Name
(Specification
(Formal
)),
1937 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1939 -- If the formal subprogram has the same name as another
1940 -- formal subprogram of the generic, then a named
1941 -- association is illegal (12.3(9)). Exclude named
1942 -- associations that are generated for a nested instance.
1945 and then Is_Named_Assoc
1946 and then Comes_From_Source
(Found_Assoc
)
1948 Check_Overloaded_Formal_Subprogram
(Formal
);
1951 -- If there is no corresponding actual, this may be case
1952 -- of partial parameterization, or else the formal has a
1953 -- default or a box.
1955 if No
(Match
) and then Partial_Parameterization
then
1956 Process_Default
(Formal
);
1958 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1959 Check_Overloaded_Formal_Subprogram
(Formal
);
1963 Append_To
(Assoc_List
,
1964 Instantiate_Formal_Subprogram
1965 (Formal
, Match
, Analyzed_Formal
));
1967 -- If formal subprogram has contracts, create wrappers
1968 -- for it. This is an expansion activity that cannot
1969 -- take place e.g. within an enclosing generic unit.
1971 if Has_Contracts
(Analyzed_Formal
)
1972 and then (Expander_Active
or GNATprove_Mode
)
1974 Build_Subprogram_Wrappers
;
1977 -- An instantiation is a freeze point for the actuals,
1978 -- unless this is a rewritten formal package.
1980 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1981 and then Nkind
(Match
) = N_Identifier
1982 and then Is_Subprogram
(Entity
(Match
))
1984 -- The actual subprogram may rename a routine defined
1985 -- in Standard. Avoid freezing such renamings because
1986 -- subprograms coming from Standard cannot be frozen.
1989 not Renames_Standard_Subprogram
(Entity
(Match
))
1991 -- If the actual subprogram comes from a different
1992 -- unit, it is already frozen, either by a body in
1993 -- that unit or by the end of the declarative part
1994 -- of the unit. This check avoids the freezing of
1995 -- subprograms defined in Standard which are used
1996 -- as generic actuals.
1998 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1999 and then Has_Fully_Defined_Profile
(Entity
(Match
))
2001 -- Mark the subprogram as having a delayed freeze
2002 -- since this may be an out-of-order action.
2004 Set_Has_Delayed_Freeze
(Entity
(Match
));
2005 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
2009 -- If this is a nested generic, preserve default for later
2010 -- instantiations. We do this as well for GNATprove use,
2011 -- so that the list of generic associations is complete.
2013 if No
(Match
) and then Box_Present
(Formal
) then
2015 Subp
: constant Entity_Id
:=
2017 (Specification
(Last
(Assoc_List
)));
2020 Append_To
(Default_Actuals
,
2021 Make_Generic_Association
(Sloc
(I_Node
),
2023 New_Occurrence_Of
(Subp
, Sloc
(I_Node
)),
2024 Explicit_Generic_Actual_Parameter
=>
2025 New_Occurrence_Of
(Subp
, Sloc
(I_Node
))));
2029 when N_Formal_Package_Declaration
=>
2030 -- The name of the formal package may be hidden by the
2031 -- formal parameter itself.
2033 if Error_Posted
(Analyzed_Formal
) then
2034 Abandon_Instantiation
(Instantiation_Node
);
2039 (Defining_Identifier
(Formal
),
2041 (Original_Node
(Analyzed_Formal
)));
2045 if Partial_Parameterization
then
2046 Process_Default
(Formal
);
2049 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2052 Instantiation_Node
, Defining_Identifier
(Formal
));
2054 ("\in instantiation of & declared#",
2055 Instantiation_Node
, Gen_Unit
);
2057 Abandon_Instantiation
(Instantiation_Node
);
2063 (Instantiate_Formal_Package
2064 (Formal
, Match
, Analyzed_Formal
),
2067 -- Determine whether the actual package needs an explicit
2068 -- freeze node. This is only the case if the actual is
2069 -- declared in the same unit and has a body. Normally
2070 -- packages do not have explicit freeze nodes, and gigi
2071 -- only uses them to elaborate entities in a package
2074 Explicit_Freeze_Check
: declare
2075 Actual
: constant Entity_Id
:= Entity
(Match
);
2076 Gen_Par
: Entity_Id
;
2078 Needs_Freezing
: Boolean;
2081 procedure Check_Generic_Parent
;
2082 -- The actual may be an instantiation of a unit
2083 -- declared in a previous instantiation. If that
2084 -- one is also in the current compilation, it must
2085 -- itself be frozen before the actual. The actual
2086 -- may be an instantiation of a generic child unit,
2087 -- in which case the same applies to the instance
2088 -- of the parent which must be frozen before the
2090 -- Should this itself be recursive ???
2092 --------------------------
2093 -- Check_Generic_Parent --
2094 --------------------------
2096 procedure Check_Generic_Parent
is
2097 Inst
: constant Node_Id
:=
2098 Get_Unit_Instantiation_Node
(Actual
);
2104 if Nkind
(Parent
(Actual
)) = N_Package_Specification
2106 Par
:= Scope
(Generic_Parent
(Parent
(Actual
)));
2108 if Is_Generic_Instance
(Par
) then
2111 -- If the actual is a child generic unit, check
2112 -- whether the instantiation of the parent is
2113 -- also local and must also be frozen now. We
2114 -- must retrieve the instance node to locate the
2115 -- parent instance if any.
2117 elsif Ekind
(Par
) = E_Generic_Package
2118 and then Is_Child_Unit
(Gen_Par
)
2119 and then Ekind
(Scope
(Gen_Par
)) =
2122 if Nkind
(Inst
) = N_Package_Instantiation
2123 and then Nkind
(Name
(Inst
)) =
2126 -- Retrieve entity of parent instance
2128 Par
:= Entity
(Prefix
(Name
(Inst
)));
2137 and then Is_Generic_Instance
(Par
)
2138 and then Scope
(Par
) = Current_Scope
2140 (No
(Freeze_Node
(Par
))
2142 not Is_List_Member
(Freeze_Node
(Par
)))
2144 Set_Has_Delayed_Freeze
(Par
);
2145 Append_Elmt
(Par
, Actuals_To_Freeze
);
2147 end Check_Generic_Parent
;
2149 -- Start of processing for Explicit_Freeze_Check
2152 if Present
(Renamed_Entity
(Actual
)) then
2154 Generic_Parent
(Specification
2155 (Unit_Declaration_Node
2156 (Renamed_Entity
(Actual
))));
2159 Generic_Parent
(Specification
2160 (Unit_Declaration_Node
(Actual
)));
2163 if not Expander_Active
2164 or else not Has_Completion
(Actual
)
2165 or else not In_Same_Source_Unit
(I_Node
, Actual
)
2166 or else Is_Frozen
(Actual
)
2168 (Present
(Renamed_Entity
(Actual
))
2170 not In_Same_Source_Unit
2171 (I_Node
, (Renamed_Entity
(Actual
))))
2176 -- Finally we want to exclude such freeze nodes
2177 -- from statement sequences, which freeze
2178 -- everything before them.
2179 -- Is this strictly necessary ???
2181 Needs_Freezing
:= True;
2183 P
:= Parent
(I_Node
);
2184 while Nkind
(P
) /= N_Compilation_Unit
loop
2185 if Nkind
(P
) = N_Handled_Sequence_Of_Statements
2187 Needs_Freezing
:= False;
2194 if Needs_Freezing
then
2195 Check_Generic_Parent
;
2197 -- If the actual is a renaming of a proper
2198 -- instance of the formal package, indicate
2199 -- that it is the instance that must be frozen.
2201 if Nkind
(Parent
(Actual
)) =
2202 N_Package_Renaming_Declaration
2204 Set_Has_Delayed_Freeze
2205 (Renamed_Entity
(Actual
));
2207 (Renamed_Entity
(Actual
),
2210 Set_Has_Delayed_Freeze
(Actual
);
2211 Append_Elmt
(Actual
, Actuals_To_Freeze
);
2215 end Explicit_Freeze_Check
;
2218 -- For use type and use package appearing in the generic part,
2219 -- we have already copied them, so we can just move them where
2220 -- they belong (we mustn't recopy them since this would mess up
2221 -- the Sloc values).
2223 when N_Use_Package_Clause
2226 if Nkind
(Original_Node
(I_Node
)) =
2227 N_Formal_Package_Declaration
2229 Append
(New_Copy_Tree
(Formal
), Assoc_List
);
2232 Append
(Formal
, Assoc_List
);
2236 raise Program_Error
;
2239 -- Check here the correct use of Ghost entities in generic
2240 -- instantiations, as now the generic has been resolved and
2241 -- we know which formal generic parameters are ghost (SPARK
2244 if Nkind
(Formal
) not in N_Use_Package_Clause
2247 Check_Ghost_Context_In_Generic_Association
2249 Formal
=> Defining_Entity
(Analyzed_Formal
));
2252 Formal
:= Saved_Formal
;
2253 Next_Non_Pragma
(Analyzed_Formal
);
2256 if Num_Actuals
> Num_Matched
then
2257 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2259 if Present
(Selector_Name
(Actual
)) then
2261 ("unmatched actual &", Actual
, Selector_Name
(Actual
));
2263 ("\in instantiation of & declared#", Actual
, Gen_Unit
);
2266 ("unmatched actual in instantiation of & declared#",
2271 elsif Present
(Actuals
) then
2273 ("too many actuals in generic instantiation", Instantiation_Node
);
2276 -- An instantiation freezes all generic actuals. The only exceptions
2277 -- to this are incomplete types and subprograms which are not fully
2278 -- defined at the point of instantiation.
2281 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
2283 while Present
(Elmt
) loop
2284 Freeze_Before
(I_Node
, Node
(Elmt
));
2289 -- If there are default subprograms, normalize the tree by adding
2290 -- explicit associations for them. This is required if the instance
2291 -- appears within a generic.
2293 if not Is_Empty_List
(Default_Actuals
) then
2298 Default
:= First
(Default_Actuals
);
2299 while Present
(Default
) loop
2300 Mark_Rewrite_Insertion
(Default
);
2304 if No
(Actuals
) then
2305 Set_Generic_Associations
(I_Node
, Default_Actuals
);
2307 Append_List_To
(Actuals
, Default_Actuals
);
2312 -- If this is a formal package, normalize the parameter list by adding
2313 -- explicit box associations for the formals that are covered by an
2316 Append_List
(Default_Formals
, Formals
);
2319 end Analyze_Associations
;
2321 -------------------------------
2322 -- Analyze_Formal_Array_Type --
2323 -------------------------------
2325 procedure Analyze_Formal_Array_Type
2326 (T
: in out Entity_Id
;
2332 -- Treated like a non-generic array declaration, with additional
2337 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2338 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2339 while Present
(DSS
) loop
2340 if Nkind
(DSS
) in N_Subtype_Indication
2342 | N_Attribute_Reference
2344 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2351 Array_Type_Declaration
(T
, Def
);
2352 Set_Is_Generic_Type
(Base_Type
(T
));
2354 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2355 and then No
(Full_View
(Component_Type
(T
)))
2357 Error_Msg_N
("premature usage of incomplete type", Def
);
2359 -- Check that range constraint is not allowed on the component type
2360 -- of a generic formal array type (AARM 12.5.3(3))
2362 elsif Is_Internal
(Component_Type
(T
))
2363 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2364 and then Nkind
(Original_Node
2365 (Subtype_Indication
(Component_Definition
(Def
)))) =
2366 N_Subtype_Indication
2369 ("in a formal, a subtype indication can only be "
2370 & "a subtype mark (RM 12.5.3(3))",
2371 Subtype_Indication
(Component_Definition
(Def
)));
2374 end Analyze_Formal_Array_Type
;
2376 ---------------------------------------------
2377 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2378 ---------------------------------------------
2380 -- As for other generic types, we create a valid type representation with
2381 -- legal but arbitrary attributes, whose values are never considered
2382 -- static. For all scalar types we introduce an anonymous base type, with
2383 -- the same attributes. We choose the corresponding integer type to be
2384 -- Standard_Integer.
2385 -- Here and in other similar routines, the Sloc of the generated internal
2386 -- type must be the same as the sloc of the defining identifier of the
2387 -- formal type declaration, to provide proper source navigation.
2389 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2393 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2395 Base
: constant Entity_Id
:=
2397 (E_Decimal_Fixed_Point_Type
,
2399 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2401 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2402 Delta_Val
: constant Ureal
:= Ureal_1
;
2403 Digs_Val
: constant Uint
:= Uint_6
;
2405 function Make_Dummy_Bound
return Node_Id
;
2406 -- Return a properly typed universal real literal to use as a bound
2408 ----------------------
2409 -- Make_Dummy_Bound --
2410 ----------------------
2412 function Make_Dummy_Bound
return Node_Id
is
2413 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2415 Set_Etype
(Bound
, Universal_Real
);
2417 end Make_Dummy_Bound
;
2419 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2424 Set_Etype
(Base
, Base
);
2425 Set_Size_Info
(Base
, Int_Base
);
2426 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2427 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2428 Set_Digits_Value
(Base
, Digs_Val
);
2429 Set_Delta_Value
(Base
, Delta_Val
);
2430 Set_Small_Value
(Base
, Delta_Val
);
2431 Set_Scalar_Range
(Base
,
2433 Low_Bound
=> Make_Dummy_Bound
,
2434 High_Bound
=> Make_Dummy_Bound
));
2436 Set_Is_Generic_Type
(Base
);
2437 Set_Parent
(Base
, Parent
(Def
));
2439 Mutate_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2440 Set_Etype
(T
, Base
);
2441 Set_Size_Info
(T
, Int_Base
);
2442 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2443 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2444 Set_Digits_Value
(T
, Digs_Val
);
2445 Set_Delta_Value
(T
, Delta_Val
);
2446 Set_Small_Value
(T
, Delta_Val
);
2447 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2448 Set_Is_Constrained
(T
);
2450 Check_Restriction
(No_Fixed_Point
, Def
);
2451 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2453 -------------------------------------------
2454 -- Analyze_Formal_Derived_Interface_Type --
2455 -------------------------------------------
2457 procedure Analyze_Formal_Derived_Interface_Type
2462 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2465 -- Rewrite as a type declaration of a derived type. This ensures that
2466 -- the interface list and primitive operations are properly captured.
2469 Make_Full_Type_Declaration
(Loc
,
2470 Defining_Identifier
=> T
,
2471 Type_Definition
=> Def
));
2473 -- Keep the aspects from the original node
2475 Move_Aspects
(Original_Node
(N
), N
);
2478 Set_Is_Generic_Type
(T
);
2479 end Analyze_Formal_Derived_Interface_Type
;
2481 ---------------------------------
2482 -- Analyze_Formal_Derived_Type --
2483 ---------------------------------
2485 procedure Analyze_Formal_Derived_Type
2490 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2491 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2495 Set_Is_Generic_Type
(T
);
2497 if Private_Present
(Def
) then
2499 Make_Private_Extension_Declaration
(Loc
,
2500 Defining_Identifier
=> T
,
2501 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2502 Unknown_Discriminants_Present
=> Unk_Disc
,
2503 Subtype_Indication
=> Subtype_Mark
(Def
),
2504 Interface_List
=> Interface_List
(Def
));
2506 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2507 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2508 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2512 Make_Full_Type_Declaration
(Loc
,
2513 Defining_Identifier
=> T
,
2514 Discriminant_Specifications
=>
2515 Discriminant_Specifications
(Parent
(T
)),
2517 Make_Derived_Type_Definition
(Loc
,
2518 Subtype_Indication
=> Subtype_Mark
(Def
)));
2520 Set_Abstract_Present
2521 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2523 (Type_Definition
(New_N
), Limited_Present
(Def
));
2528 -- Keep the aspects from the original node
2530 Move_Aspects
(Original_Node
(N
), N
);
2535 if not Is_Composite_Type
(T
) then
2537 ("unknown discriminants not allowed for elementary types", N
);
2539 Set_Has_Unknown_Discriminants
(T
);
2540 Set_Is_Constrained
(T
, False);
2544 -- If the parent type has a known size, so does the formal, which makes
2545 -- legal representation clauses that involve the formal.
2547 Set_Size_Known_At_Compile_Time
2548 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2549 end Analyze_Formal_Derived_Type
;
2551 ----------------------------------
2552 -- Analyze_Formal_Discrete_Type --
2553 ----------------------------------
2555 -- The operations defined for a discrete types are those of an enumeration
2556 -- type. The size is set to an arbitrary value, for use in analyzing the
2559 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2560 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2564 Base
: constant Entity_Id
:=
2566 (E_Floating_Point_Type
, Current_Scope
,
2567 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2571 Mutate_Ekind
(T
, E_Enumeration_Subtype
);
2572 Set_Etype
(T
, Base
);
2574 Reinit_Alignment
(T
);
2575 Set_Is_Generic_Type
(T
);
2576 Set_Is_Constrained
(T
);
2578 -- For semantic analysis, the bounds of the type must be set to some
2579 -- non-static value. The simplest is to create attribute nodes for those
2580 -- bounds, that refer to the type itself. These bounds are never
2581 -- analyzed but serve as place-holders.
2584 Make_Attribute_Reference
(Loc
,
2585 Attribute_Name
=> Name_First
,
2586 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2590 Make_Attribute_Reference
(Loc
,
2591 Attribute_Name
=> Name_Last
,
2592 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2595 Set_Scalar_Range
(T
,
2600 Mutate_Ekind
(Base
, E_Enumeration_Type
);
2601 Set_Etype
(Base
, Base
);
2602 Init_Size
(Base
, 8);
2603 Reinit_Alignment
(Base
);
2604 Set_Is_Generic_Type
(Base
);
2605 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2606 Set_Parent
(Base
, Parent
(Def
));
2607 end Analyze_Formal_Discrete_Type
;
2609 ----------------------------------
2610 -- Analyze_Formal_Floating_Type --
2611 ---------------------------------
2613 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2614 Base
: constant Entity_Id
:=
2616 (E_Floating_Point_Type
, Current_Scope
,
2617 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2620 -- The various semantic attributes are taken from the predefined type
2621 -- Float, just so that all of them are initialized. Their values are
2622 -- never used because no constant folding or expansion takes place in
2623 -- the generic itself.
2626 Mutate_Ekind
(T
, E_Floating_Point_Subtype
);
2627 Set_Etype
(T
, Base
);
2628 Set_Size_Info
(T
, (Standard_Float
));
2629 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2630 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2631 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2632 Set_Is_Constrained
(T
);
2634 Set_Is_Generic_Type
(Base
);
2635 Set_Etype
(Base
, Base
);
2636 Set_Size_Info
(Base
, (Standard_Float
));
2637 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2638 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2639 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2640 Set_Parent
(Base
, Parent
(Def
));
2642 Check_Restriction
(No_Floating_Point
, Def
);
2643 end Analyze_Formal_Floating_Type
;
2645 -----------------------------------
2646 -- Analyze_Formal_Interface_Type;--
2647 -----------------------------------
2649 procedure Analyze_Formal_Interface_Type
2654 Loc
: constant Source_Ptr
:= Sloc
(N
);
2659 Make_Full_Type_Declaration
(Loc
,
2660 Defining_Identifier
=> T
,
2661 Type_Definition
=> Def
);
2665 -- Keep the aspects from the original node
2667 Move_Aspects
(Original_Node
(N
), N
);
2670 Set_Is_Generic_Type
(T
);
2671 end Analyze_Formal_Interface_Type
;
2673 ---------------------------------
2674 -- Analyze_Formal_Modular_Type --
2675 ---------------------------------
2677 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2679 -- Apart from their entity kind, generic modular types are treated like
2680 -- signed integer types, and have the same attributes.
2682 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2683 Mutate_Ekind
(T
, E_Modular_Integer_Subtype
);
2684 Mutate_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2686 end Analyze_Formal_Modular_Type
;
2688 ---------------------------------------
2689 -- Analyze_Formal_Object_Declaration --
2690 ---------------------------------------
2692 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2693 E
: constant Node_Id
:= Default_Expression
(N
);
2694 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2697 Parent_Installed
: Boolean := False;
2703 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
2705 -- Determine the mode of the formal object
2707 if Out_Present
(N
) then
2708 K
:= E_Generic_In_Out_Parameter
;
2710 if not In_Present
(N
) then
2711 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2715 K
:= E_Generic_In_Parameter
;
2718 if Present
(Subtype_Mark
(N
)) then
2719 Find_Type
(Subtype_Mark
(N
));
2720 T
:= Entity
(Subtype_Mark
(N
));
2722 -- Verify that there is no redundant null exclusion
2724 if Null_Exclusion_Present
(N
) then
2725 if not Is_Access_Type
(T
) then
2727 ("null exclusion can only apply to an access type", N
);
2729 elsif Can_Never_Be_Null
(T
) then
2731 ("`NOT NULL` not allowed (& already excludes null)", N
, T
);
2735 -- Ada 2005 (AI-423): Formal object with an access definition
2738 Check_Access_Definition
(N
);
2739 T
:= Access_Definition
2741 N
=> Access_Definition
(N
));
2744 if Ekind
(T
) = E_Incomplete_Type
then
2746 Error_Node
: Node_Id
;
2749 if Present
(Subtype_Mark
(N
)) then
2750 Error_Node
:= Subtype_Mark
(N
);
2752 Check_Access_Definition
(N
);
2753 Error_Node
:= Access_Definition
(N
);
2756 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2760 if K
= E_Generic_In_Parameter
then
2762 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2764 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2766 ("generic formal of mode IN must not be of limited type", N
);
2767 Explain_Limited_Type
(T
, N
);
2770 if Is_Abstract_Type
(T
) then
2772 ("generic formal of mode IN must not be of abstract type", N
);
2776 Preanalyze_Spec_Expression
(E
, T
);
2778 -- The default for a ghost generic formal IN parameter of
2779 -- access-to-variable type should be a ghost object (SPARK
2782 if Is_Access_Variable
(T
) then
2783 Check_Ghost_Formal_Variable
2786 Is_Default
=> True);
2789 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2791 ("initialization not allowed for limited types", E
);
2792 Explain_Limited_Type
(T
, E
);
2796 Mutate_Ekind
(Id
, K
);
2799 -- Case of generic IN OUT parameter
2802 -- If the formal has an unconstrained type, construct its actual
2803 -- subtype, as is done for subprogram formals. In this fashion, all
2804 -- its uses can refer to specific bounds.
2806 Mutate_Ekind
(Id
, K
);
2809 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2810 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2813 Non_Freezing_Ref
: constant Node_Id
:=
2814 New_Occurrence_Of
(Id
, Sloc
(Id
));
2818 -- Make sure the actual subtype doesn't generate bogus freezing
2820 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2821 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2822 Insert_Before_And_Analyze
(N
, Decl
);
2823 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2826 Set_Actual_Subtype
(Id
, T
);
2831 ("initialization not allowed for `IN OUT` formals", N
);
2835 Analyze_Aspect_Specifications
(N
, Id
);
2837 if Parent_Installed
then
2840 end Analyze_Formal_Object_Declaration
;
2842 ----------------------------------------------
2843 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2844 ----------------------------------------------
2846 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2850 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2851 Base
: constant Entity_Id
:=
2853 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2854 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2857 -- The semantic attributes are set for completeness only, their values
2858 -- will never be used, since all properties of the type are non-static.
2861 Mutate_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2862 Set_Etype
(T
, Base
);
2863 Set_Size_Info
(T
, Standard_Integer
);
2864 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2865 Set_Small_Value
(T
, Ureal_1
);
2866 Set_Delta_Value
(T
, Ureal_1
);
2867 Set_Scalar_Range
(T
,
2869 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2870 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2871 Set_Is_Constrained
(T
);
2873 Set_Is_Generic_Type
(Base
);
2874 Set_Etype
(Base
, Base
);
2875 Set_Size_Info
(Base
, Standard_Integer
);
2876 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2877 Set_Small_Value
(Base
, Ureal_1
);
2878 Set_Delta_Value
(Base
, Ureal_1
);
2879 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2880 Set_Parent
(Base
, Parent
(Def
));
2882 Check_Restriction
(No_Fixed_Point
, Def
);
2883 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2885 ----------------------------------------
2886 -- Analyze_Formal_Package_Declaration --
2887 ----------------------------------------
2889 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2890 Gen_Id
: constant Node_Id
:= Name
(N
);
2891 Loc
: constant Source_Ptr
:= Sloc
(N
);
2892 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2895 Gen_Unit
: Entity_Id
;
2898 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2899 -- List of primitives made temporarily visible in the instantiation
2900 -- to match the visibility of the formal type.
2902 function Build_Local_Package
return Node_Id
;
2903 -- The formal package is rewritten so that its parameters are replaced
2904 -- with corresponding declarations. For parameters with bona fide
2905 -- associations these declarations are created by Analyze_Associations
2906 -- as for a regular instantiation. For boxed parameters, we preserve
2907 -- the formal declarations and analyze them, in order to introduce
2908 -- entities of the right kind in the environment of the formal.
2910 -------------------------
2911 -- Build_Local_Package --
2912 -------------------------
2914 function Build_Local_Package
return Node_Id
is
2916 Pack_Decl
: Node_Id
;
2919 -- Within the formal, the name of the generic package is a renaming
2920 -- of the formal (as for a regular instantiation).
2923 Make_Package_Declaration
(Loc
,
2926 (Specification
(Original_Node
(Gen_Decl
)),
2927 Empty
, Instantiating
=> True));
2930 Make_Package_Renaming_Declaration
(Loc
,
2931 Defining_Unit_Name
=>
2932 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2933 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2935 if Nkind
(Gen_Id
) = N_Identifier
2936 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2939 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2942 -- If the formal is declared with a box, or with an others choice,
2943 -- create corresponding declarations for all entities in the formal
2944 -- part, so that names with the proper types are available in the
2945 -- specification of the formal package.
2947 -- On the other hand, if there are no associations, then all the
2948 -- formals must have defaults, and this will be checked by the
2949 -- call to Analyze_Associations.
2952 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2955 Formal_Decl
: Node_Id
;
2958 -- TBA : for a formal package, need to recurse ???
2963 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2964 while Present
(Formal_Decl
) loop
2968 (Formal_Decl
, Empty
, Instantiating
=> True));
2973 -- If generic associations are present, use Analyze_Associations to
2974 -- create the proper renaming declarations.
2978 Act_Tree
: constant Node_Id
:=
2980 (Original_Node
(Gen_Decl
), Empty
,
2981 Instantiating
=> True);
2984 Generic_Renamings
.Set_Last
(0);
2985 Generic_Renamings_HTable
.Reset
;
2986 Instantiation_Node
:= N
;
2989 Analyze_Associations
2990 (I_Node
=> Original_Node
(N
),
2991 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2992 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2994 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2998 Append
(Renaming
, To
=> Decls
);
3000 -- Add generated declarations ahead of local declarations in
3003 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
3004 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
3007 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
3012 end Build_Local_Package
;
3016 Save_ISMP
: constant Boolean := Ignore_SPARK_Mode_Pragmas_In_Instance
;
3017 -- Save flag Ignore_SPARK_Mode_Pragmas_In_Instance for restore on exit
3019 Associations
: Boolean := True;
3021 Parent_Installed
: Boolean := False;
3022 Parent_Instance
: Entity_Id
;
3023 Renaming_In_Par
: Entity_Id
;
3025 -- Start of processing for Analyze_Formal_Package_Declaration
3028 Check_Text_IO_Special_Unit
(Gen_Id
);
3031 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3032 Gen_Unit
:= Entity
(Gen_Id
);
3034 -- Check for a formal package that is a package renaming
3036 if Present
(Renamed_Entity
(Gen_Unit
)) then
3038 -- Indicate that unit is used, before replacing it with renamed
3039 -- entity for use below.
3041 if In_Extended_Main_Source_Unit
(N
) then
3042 Set_Is_Instantiated
(Gen_Unit
);
3043 Generate_Reference
(Gen_Unit
, N
);
3046 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
3049 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
3050 Error_Msg_N
("expect generic package name", Gen_Id
);
3054 elsif Gen_Unit
= Current_Scope
then
3056 ("generic package cannot be used as a formal package of itself",
3061 elsif In_Open_Scopes
(Gen_Unit
) then
3062 if Is_Compilation_Unit
(Gen_Unit
)
3063 and then Is_Child_Unit
(Current_Scope
)
3065 -- Special-case the error when the formal is a parent, and
3066 -- continue analysis to minimize cascaded errors.
3069 ("generic parent cannot be used as formal package of a child "
3074 ("generic package cannot be used as a formal package within "
3075 & "itself", Gen_Id
);
3081 -- Check that name of formal package does not hide name of generic,
3082 -- or its leading prefix. This check must be done separately because
3083 -- the name of the generic has already been analyzed.
3086 Gen_Name
: Entity_Id
;
3090 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
3091 Gen_Name
:= Prefix
(Gen_Name
);
3094 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
3096 ("& is hidden within declaration of formal package",
3102 or else No
(Generic_Associations
(N
))
3103 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
3105 Associations
:= False;
3108 -- If there are no generic associations, the generic parameters appear
3109 -- as local entities and are instantiated like them. We copy the generic
3110 -- package declaration as if it were an instantiation, and analyze it
3111 -- like a regular package, except that we treat the formals as
3112 -- additional visible components.
3114 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3116 if In_Extended_Main_Source_Unit
(N
) then
3117 Set_Is_Instantiated
(Gen_Unit
);
3118 Generate_Reference
(Gen_Unit
, N
);
3121 Formal
:= New_Copy
(Pack_Id
);
3122 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
3124 -- Make local generic without formals. The formals will be replaced with
3125 -- internal declarations.
3128 New_N
:= Build_Local_Package
;
3130 -- If there are errors in the parameter list, Analyze_Associations
3131 -- raises Instantiation_Error. Patch the declaration to prevent further
3132 -- exception propagation.
3135 when Instantiation_Error
=>
3136 Enter_Name
(Formal
);
3137 Mutate_Ekind
(Formal
, E_Variable
);
3138 Set_Etype
(Formal
, Any_Type
);
3139 Restore_Hidden_Primitives
(Vis_Prims_List
);
3141 if Parent_Installed
then
3149 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
3150 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
3151 Set_Instance_Env
(Gen_Unit
, Formal
);
3152 Set_Is_Generic_Instance
(Formal
);
3154 Enter_Name
(Formal
);
3155 Mutate_Ekind
(Formal
, E_Package
);
3156 Set_Etype
(Formal
, Standard_Void_Type
);
3157 Set_Inner_Instances
(Formal
, New_Elmt_List
);
3159 -- It is unclear that any aspects can apply to a formal package
3160 -- declaration, given that they look like a hidden conformance
3161 -- requirement on the corresponding actual. However, Abstract_State
3162 -- must be treated specially because it generates declarations that
3163 -- must appear before other declarations in the specification and
3164 -- must be analyzed at once.
3166 if Present
(Aspect_Specifications
(Gen_Decl
)) then
3167 if No
(Aspect_Specifications
(N
)) then
3168 Set_Aspect_Specifications
(N
, New_List
);
3172 ASN
: Node_Id
:= First
(Aspect_Specifications
(Gen_Decl
));
3176 while Present
(ASN
) loop
3177 if Get_Aspect_Id
(ASN
) = Aspect_Abstract_State
then
3179 Copy_Generic_Node
(ASN
, Empty
, Instantiating
=> True);
3180 Set_Entity
(New_A
, Formal
);
3181 Set_Analyzed
(New_A
, False);
3182 Append
(New_A
, Aspect_Specifications
(N
));
3183 Analyze_Aspect_Specifications
(N
, Formal
);
3192 Push_Scope
(Formal
);
3194 -- Manually set the SPARK_Mode from the context because the package
3195 -- declaration is never analyzed.
3197 Set_SPARK_Pragma
(Formal
, SPARK_Mode_Pragma
);
3198 Set_SPARK_Aux_Pragma
(Formal
, SPARK_Mode_Pragma
);
3199 Set_SPARK_Pragma_Inherited
(Formal
);
3200 Set_SPARK_Aux_Pragma_Inherited
(Formal
);
3202 if Is_Child_Unit
(Gen_Unit
) and then Parent_Installed
then
3204 -- Similarly, we have to make the name of the formal visible in the
3205 -- parent instance, to resolve properly fully qualified names that
3206 -- may appear in the generic unit. The parent instance has been
3207 -- placed on the scope stack ahead of the current scope.
3209 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
3212 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
3213 Mutate_Ekind
(Renaming_In_Par
, E_Package
);
3214 Set_Is_Not_Self_Hidden
(Renaming_In_Par
);
3215 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
3216 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
3217 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
3218 Set_Renamed_Entity
(Renaming_In_Par
, Formal
);
3219 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
3222 -- A formal package declaration behaves as a package instantiation with
3223 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
3224 -- missing, set the global flag which signals Analyze_Pragma to ingnore
3225 -- all SPARK_Mode pragmas within the generic_package_name.
3227 if SPARK_Mode
/= On
then
3228 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
3230 -- Mark the formal spec in case the body is instantiated at a later
3231 -- pass. This preserves the original context in effect for the body.
3233 Set_Ignore_SPARK_Mode_Pragmas
(Formal
);
3236 Analyze
(Specification
(N
));
3238 -- The formals for which associations are provided are not visible
3239 -- outside of the formal package. The others are still declared by a
3240 -- formal parameter declaration.
3242 -- If there are no associations, the only local entity to hide is the
3243 -- generated package renaming itself.
3249 E
:= First_Entity
(Formal
);
3250 while Present
(E
) loop
3251 if Associations
and then not Is_Generic_Formal
(E
) then
3255 if Ekind
(E
) = E_Package
and then Renamed_Entity
(E
) = Formal
then
3264 End_Package_Scope
(Formal
);
3265 Restore_Hidden_Primitives
(Vis_Prims_List
);
3267 if Parent_Installed
then
3273 -- Inside the generic unit, the formal package is a regular package, but
3274 -- no body is needed for it. Note that after instantiation, the defining
3275 -- unit name we need is in the new tree and not in the original (see
3276 -- Package_Instantiation). A generic formal package is an instance, and
3277 -- can be used as an actual for an inner instance.
3279 Set_Has_Completion
(Formal
, True);
3281 -- Add semantic information to the original defining identifier.
3283 Mutate_Ekind
(Pack_Id
, E_Package
);
3284 Set_Etype
(Pack_Id
, Standard_Void_Type
);
3285 Set_Scope
(Pack_Id
, Scope
(Formal
));
3286 Set_Has_Completion
(Pack_Id
, True);
3289 -- Unclear that any other aspects may appear here, analyze them
3290 -- for completion, given that the grammar allows their appearance.
3292 Analyze_Aspect_Specifications
(N
, Pack_Id
);
3294 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Save_ISMP
;
3295 end Analyze_Formal_Package_Declaration
;
3297 ---------------------------------
3298 -- Analyze_Formal_Private_Type --
3299 ---------------------------------
3301 procedure Analyze_Formal_Private_Type
3307 New_Private_Type
(N
, T
, Def
);
3309 -- Set the size to an arbitrary but legal value
3311 Set_Size_Info
(T
, Standard_Integer
);
3312 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3313 end Analyze_Formal_Private_Type
;
3315 ------------------------------------
3316 -- Analyze_Formal_Incomplete_Type --
3317 ------------------------------------
3319 procedure Analyze_Formal_Incomplete_Type
3325 Mutate_Ekind
(T
, E_Incomplete_Type
);
3327 Set_Private_Dependents
(T
, New_Elmt_List
);
3329 if Tagged_Present
(Def
) then
3330 Set_Is_Tagged_Type
(T
);
3331 Make_Class_Wide_Type
(T
);
3332 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
3334 end Analyze_Formal_Incomplete_Type
;
3336 ----------------------------------------
3337 -- Analyze_Formal_Signed_Integer_Type --
3338 ----------------------------------------
3340 procedure Analyze_Formal_Signed_Integer_Type
3344 Base
: constant Entity_Id
:=
3346 (E_Signed_Integer_Type
,
3348 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
3353 Mutate_Ekind
(T
, E_Signed_Integer_Subtype
);
3354 Set_Etype
(T
, Base
);
3355 Set_Size_Info
(T
, Standard_Integer
);
3356 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3357 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
3358 Set_Is_Constrained
(T
);
3360 Set_Is_Generic_Type
(Base
);
3361 Set_Size_Info
(Base
, Standard_Integer
);
3362 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
3363 Set_Etype
(Base
, Base
);
3364 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
3365 Set_Parent
(Base
, Parent
(Def
));
3366 end Analyze_Formal_Signed_Integer_Type
;
3368 -------------------------------------------
3369 -- Analyze_Formal_Subprogram_Declaration --
3370 -------------------------------------------
3372 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
3373 Spec
: constant Node_Id
:= Specification
(N
);
3374 Def
: constant Node_Id
:= Default_Name
(N
);
3375 Expr
: constant Node_Id
:= Expression
(N
);
3376 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
3378 Parent_Installed
: Boolean := False;
3386 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
3387 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3391 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
3393 Analyze_Subprogram_Declaration
(N
);
3394 Set_Is_Formal_Subprogram
(Nam
);
3395 Set_Has_Completion
(Nam
);
3397 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3398 Set_Is_Abstract_Subprogram
(Nam
);
3400 Set_Is_Dispatching_Operation
(Nam
);
3402 -- A formal abstract procedure cannot have a null default
3403 -- (RM 12.6(4.1/2)).
3405 if Nkind
(Spec
) = N_Procedure_Specification
3406 and then Null_Present
(Spec
)
3409 ("a formal abstract subprogram cannot default to null", Spec
);
3412 -- A formal abstract function cannot have an expression default
3413 -- (expression defaults are allowed for nonabstract formal functions
3414 -- when extensions are enabled).
3416 if Nkind
(Spec
) = N_Function_Specification
3417 and then Present
(Expr
)
3420 ("a formal abstract subprogram cannot default to an expression",
3425 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3427 if No
(Ctrl_Type
) then
3429 ("abstract formal subprogram must have a controlling type",
3432 elsif Ada_Version
>= Ada_2012
3433 and then Is_Incomplete_Type
(Ctrl_Type
)
3436 ("controlling type of abstract formal subprogram cannot "
3437 & "be incomplete type", N
, Ctrl_Type
);
3440 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3445 -- Default name is resolved at the point of instantiation
3447 if Box_Present
(N
) then
3450 -- Default name is bound at the point of generic declaration
3452 elsif Present
(Def
) then
3453 if Nkind
(Def
) = N_Operator_Symbol
then
3454 Find_Direct_Name
(Def
);
3456 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3460 -- For an attribute reference, analyze the prefix and verify
3461 -- that it has the proper profile for the subprogram.
3463 Analyze
(Prefix
(Def
));
3464 Valid_Default_Attribute
(Nam
, Def
);
3468 -- The default for a ghost generic formal procedure should be a ghost
3469 -- procedure (SPARK RM 6.9(13)).
3471 if Ekind
(Nam
) = E_Procedure
then
3473 Def_E
: Entity_Id
:= Empty
;
3475 if Nkind
(Def
) in N_Has_Entity
then
3476 Def_E
:= Entity
(Def
);
3479 Check_Ghost_Formal_Procedure_Or_Package
3483 Is_Default
=> True);
3487 -- Default name may be overloaded, in which case the interpretation
3488 -- with the correct profile must be selected, as for a renaming.
3489 -- If the definition is an indexed component, it must denote a
3490 -- member of an entry family. If it is a selected component, it
3491 -- can be a protected operation.
3493 if Etype
(Def
) = Any_Type
then
3496 elsif Nkind
(Def
) = N_Selected_Component
then
3497 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3498 Error_Msg_N
("expect valid subprogram name as default", Def
);
3501 elsif Nkind
(Def
) = N_Indexed_Component
then
3502 if Is_Entity_Name
(Prefix
(Def
)) then
3503 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3504 Error_Msg_N
("expect valid subprogram name as default", Def
);
3507 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3508 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3511 Error_Msg_N
("expect valid subprogram name as default", Def
);
3515 Error_Msg_N
("expect valid subprogram name as default", Def
);
3519 elsif Nkind
(Def
) = N_Character_Literal
then
3521 -- Needs some type checks: subprogram should be parameterless???
3523 Resolve
(Def
, (Etype
(Nam
)));
3525 elsif not Is_Entity_Name
(Def
)
3526 or else not Is_Overloadable
(Entity
(Def
))
3528 Error_Msg_N
("expect valid subprogram name as default", Def
);
3531 elsif not Is_Overloaded
(Def
) then
3532 Subp
:= Entity
(Def
);
3535 Error_Msg_N
("premature usage of formal subprogram", Def
);
3537 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3538 Error_Msg_N
("no visible entity matches specification", Def
);
3541 -- More than one interpretation, so disambiguate as for a renaming
3546 I1
: Interp_Index
:= 0;
3552 Get_First_Interp
(Def
, I
, It
);
3553 while Present
(It
.Nam
) loop
3554 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3555 if Subp
/= Any_Id
then
3556 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3558 if It1
= No_Interp
then
3559 Error_Msg_N
("ambiguous default subprogram", Def
);
3572 Get_Next_Interp
(I
, It
);
3576 if Subp
/= Any_Id
then
3578 -- Subprogram found, generate reference to it
3580 Set_Entity
(Def
, Subp
);
3581 Generate_Reference
(Subp
, Def
);
3584 Error_Msg_N
("premature usage of formal subprogram", Def
);
3586 elsif Ekind
(Subp
) /= E_Operator
then
3587 Check_Mode_Conformant
(Subp
, Nam
);
3591 Error_Msg_N
("no visible subprogram matches specification", N
);
3595 -- When extensions are enabled, an expression can be given as default
3596 -- for a formal function. The expression must be of the function result
3597 -- type and can reference formal parameters of the function.
3599 elsif Present
(Expr
) then
3601 Install_Formals
(Nam
);
3602 Preanalyze_Spec_Expression
(Expr
, Etype
(Nam
));
3607 Analyze_Aspect_Specifications
(N
, Nam
);
3609 if Parent_Installed
then
3612 end Analyze_Formal_Subprogram_Declaration
;
3614 -------------------------------------
3615 -- Analyze_Formal_Type_Declaration --
3616 -------------------------------------
3618 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3619 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3621 Parent_Installed
: Boolean := False;
3625 T
:= Defining_Identifier
(N
);
3627 if Present
(Discriminant_Specifications
(N
))
3628 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3631 ("discriminants not allowed for this formal type", T
);
3634 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
3636 -- Enter the new name, and branch to specific routine
3639 when N_Formal_Private_Type_Definition
=>
3640 Analyze_Formal_Private_Type
(N
, T
, Def
);
3642 when N_Formal_Derived_Type_Definition
=>
3643 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3645 when N_Formal_Incomplete_Type_Definition
=>
3646 Analyze_Formal_Incomplete_Type
(T
, Def
);
3648 when N_Formal_Discrete_Type_Definition
=>
3649 Analyze_Formal_Discrete_Type
(T
, Def
);
3651 when N_Formal_Signed_Integer_Type_Definition
=>
3652 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3654 when N_Formal_Modular_Type_Definition
=>
3655 Analyze_Formal_Modular_Type
(T
, Def
);
3657 when N_Formal_Floating_Point_Definition
=>
3658 Analyze_Formal_Floating_Type
(T
, Def
);
3660 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3661 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3663 when N_Formal_Decimal_Fixed_Point_Definition
=>
3664 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3666 when N_Array_Type_Definition
=>
3667 Analyze_Formal_Array_Type
(T
, Def
);
3669 when N_Access_Function_Definition
3670 | N_Access_Procedure_Definition
3671 | N_Access_To_Object_Definition
3673 Analyze_Generic_Access_Type
(T
, Def
);
3675 -- Ada 2005: a interface declaration is encoded as an abstract
3676 -- record declaration or a abstract type derivation.
3678 when N_Record_Definition
=>
3679 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3681 when N_Derived_Type_Definition
=>
3682 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3688 raise Program_Error
;
3691 -- A formal type declaration declares a type and its first
3694 Set_Is_Generic_Type
(T
);
3695 Set_Is_First_Subtype
(T
);
3697 if Present
(Default_Subtype_Mark
(Original_Node
(N
))) then
3698 Validate_Formal_Type_Default
(N
);
3701 Analyze_Aspect_Specifications
(N
, T
);
3703 if Parent_Installed
then
3706 end Analyze_Formal_Type_Declaration
;
3708 ------------------------------------
3709 -- Analyze_Function_Instantiation --
3710 ------------------------------------
3712 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3714 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3715 end Analyze_Function_Instantiation
;
3717 ---------------------------------
3718 -- Analyze_Generic_Access_Type --
3719 ---------------------------------
3721 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3725 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3726 Access_Type_Declaration
(T
, Def
);
3728 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3729 and then No
(Full_View
(Designated_Type
(T
)))
3730 and then not Is_Generic_Type
(Designated_Type
(T
))
3732 Error_Msg_N
("premature usage of incomplete type", Def
);
3734 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3736 ("only a subtype mark is allowed in a formal", Def
);
3740 Access_Subprogram_Declaration
(T
, Def
);
3742 end Analyze_Generic_Access_Type
;
3744 ---------------------------------
3745 -- Analyze_Generic_Formal_Part --
3746 ---------------------------------
3748 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3749 Gen_Parm_Decl
: Node_Id
;
3752 -- The generic formals are processed in the scope of the generic unit,
3753 -- where they are immediately visible. The scope is installed by the
3756 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3757 while Present
(Gen_Parm_Decl
) loop
3758 Analyze
(Gen_Parm_Decl
);
3759 Next
(Gen_Parm_Decl
);
3762 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3764 -- For Ada 2022, some formal parameters can carry aspects, which must
3765 -- be name-resolved at the end of the list of formal parameters (which
3766 -- has the semantics of a declaration list).
3768 Analyze_Contracts
(Generic_Formal_Declarations
(N
));
3769 end Analyze_Generic_Formal_Part
;
3771 ------------------------------------------
3772 -- Analyze_Generic_Package_Declaration --
3773 ------------------------------------------
3775 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3776 Decls
: constant List_Id
:= Visible_Declarations
(Specification
(N
));
3777 Loc
: constant Source_Ptr
:= Sloc
(N
);
3783 Save_Parent
: Node_Id
;
3786 -- A generic may grant access to its private enclosing context depending
3787 -- on the placement of its corresponding body. From elaboration point of
3788 -- view, the flow of execution may enter this private context, and then
3789 -- reach an external unit, thus producing a dependency on that external
3790 -- unit. For such a path to be properly discovered and encoded in the
3791 -- ALI file of the main unit, let the ABE mechanism process the body of
3792 -- the main unit, and encode all relevant invocation constructs and the
3793 -- relations between them.
3795 Mark_Save_Invocation_Graph_Of_Body
;
3797 -- We introduce a renaming of the enclosing package, to have a usable
3798 -- entity as the prefix of an expanded name for a local entity of the
3799 -- form Par.P.Q, where P is the generic package. This is because a local
3800 -- entity named P may hide it, so that the usual visibility rules in
3801 -- the instance will not resolve properly.
3804 Make_Package_Renaming_Declaration
(Loc
,
3805 Defining_Unit_Name
=>
3806 Make_Defining_Identifier
(Loc
,
3807 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3809 Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3811 -- The declaration is inserted before other declarations, but before
3812 -- pragmas that may be library-unit pragmas and must appear before other
3813 -- declarations. The pragma Compile_Time_Error is not in this class, and
3814 -- may contain an expression that includes such a qualified name, so the
3815 -- renaming declaration must appear before it.
3817 -- Are there other pragmas that require this special handling ???
3819 if Present
(Decls
) then
3820 Decl
:= First
(Decls
);
3821 while Present
(Decl
)
3822 and then Nkind
(Decl
) = N_Pragma
3823 and then Get_Pragma_Id
(Decl
) /= Pragma_Compile_Time_Error
3828 if Present
(Decl
) then
3829 Insert_Before
(Decl
, Renaming
);
3831 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3835 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3838 -- Create copy of generic unit, and save for instantiation. If the unit
3839 -- is a child unit, do not copy the specifications for the parent, which
3840 -- are not part of the generic tree.
3842 Save_Parent
:= Parent_Spec
(N
);
3843 Set_Parent_Spec
(N
, Empty
);
3845 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3846 Set_Parent_Spec
(New_N
, Save_Parent
);
3849 -- Collect all contract-related source pragmas found within the template
3850 -- and attach them to the contract of the package spec. This contract is
3851 -- used in the capture of global references within annotations.
3853 Create_Generic_Contract
(N
);
3855 Id
:= Defining_Entity
(N
);
3856 Generate_Definition
(Id
);
3858 -- Expansion is not applied to generic units
3863 Mutate_Ekind
(Id
, E_Generic_Package
);
3864 Set_Is_Not_Self_Hidden
(Id
);
3865 Set_Etype
(Id
, Standard_Void_Type
);
3867 -- Set SPARK_Mode from context
3869 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3870 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
3871 Set_SPARK_Pragma_Inherited
(Id
);
3872 Set_SPARK_Aux_Pragma_Inherited
(Id
);
3874 -- Preserve relevant elaboration-related attributes of the context which
3875 -- are no longer available or very expensive to recompute once analysis,
3876 -- resolution, and expansion are over.
3878 Mark_Elaboration_Attributes
3883 -- Analyze aspects now, so that generated pragmas appear in the
3884 -- declarations before building and analyzing the generic copy.
3886 Analyze_Aspect_Specifications
(N
, Id
);
3889 Enter_Generic_Scope
(Id
);
3890 Set_Inner_Instances
(Id
, New_Elmt_List
);
3892 Set_Categorization_From_Pragmas
(N
);
3893 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3895 -- Link the declaration of the generic homonym in the generic copy to
3896 -- the package it renames, so that it is always resolved properly.
3898 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3899 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3901 -- For a library unit, we have reconstructed the entity for the unit,
3902 -- and must reset it in the library tables.
3904 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3905 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3908 Analyze_Generic_Formal_Part
(N
);
3910 -- After processing the generic formals, analysis proceeds as for a
3911 -- non-generic package.
3913 Analyze
(Specification
(N
));
3915 Validate_Categorization_Dependency
(N
, Id
);
3919 End_Package_Scope
(Id
);
3920 Exit_Generic_Scope
(Id
);
3922 -- If the generic appears within a package unit, the body of that unit
3923 -- has to be present for instantiation and inlining.
3925 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
then
3926 Set_Body_Needed_For_Inlining
3927 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3930 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3931 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3932 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3933 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3936 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3937 Validate_RT_RAT_Component
(N
);
3939 -- If this is a spec without a body, check that generic parameters
3942 if not Body_Required
(Parent
(N
)) then
3943 Check_References
(Id
);
3947 -- If there is a specified storage pool in the context, create an
3948 -- aspect on the package declaration, so that it is used in any
3949 -- instance that does not override it.
3951 if Present
(Default_Pool
) then
3957 Make_Aspect_Specification
(Loc
,
3958 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3959 Expression
=> New_Copy
(Default_Pool
));
3961 if No
(Aspect_Specifications
(Specification
(N
))) then
3962 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3964 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3968 end Analyze_Generic_Package_Declaration
;
3970 --------------------------------------------
3971 -- Analyze_Generic_Subprogram_Declaration --
3972 --------------------------------------------
3974 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3978 Result_Type
: Entity_Id
;
3979 Save_Parent
: Node_Id
;
3984 -- A generic may grant access to its private enclosing context depending
3985 -- on the placement of its corresponding body. From elaboration point of
3986 -- view, the flow of execution may enter this private context, and then
3987 -- reach an external unit, thus producing a dependency on that external
3988 -- unit. For such a path to be properly discovered and encoded in the
3989 -- ALI file of the main unit, let the ABE mechanism process the body of
3990 -- the main unit, and encode all relevant invocation constructs and the
3991 -- relations between them.
3993 Mark_Save_Invocation_Graph_Of_Body
;
3995 -- Create copy of generic unit, and save for instantiation. If the unit
3996 -- is a child unit, do not copy the specifications for the parent, which
3997 -- are not part of the generic tree.
3999 Save_Parent
:= Parent_Spec
(N
);
4000 Set_Parent_Spec
(N
, Empty
);
4002 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
4003 Set_Parent_Spec
(New_N
, Save_Parent
);
4006 -- Collect all contract-related source pragmas found within the template
4007 -- and attach them to the contract of the subprogram spec. This contract
4008 -- is used in the capture of global references within annotations.
4010 Create_Generic_Contract
(N
);
4012 Spec
:= Specification
(N
);
4013 Id
:= Defining_Entity
(Spec
);
4014 Generate_Definition
(Id
);
4016 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
4018 ("operator symbol not allowed for generic subprogram", Id
);
4024 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
4027 Enter_Generic_Scope
(Id
);
4028 Set_Inner_Instances
(Id
, New_Elmt_List
);
4029 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
4031 Analyze_Generic_Formal_Part
(N
);
4033 if Nkind
(Spec
) = N_Function_Specification
then
4034 Mutate_Ekind
(Id
, E_Generic_Function
);
4036 Mutate_Ekind
(Id
, E_Generic_Procedure
);
4039 -- Set SPARK_Mode from context
4041 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
4042 Set_SPARK_Pragma_Inherited
(Id
);
4044 -- Preserve relevant elaboration-related attributes of the context which
4045 -- are no longer available or very expensive to recompute once analysis,
4046 -- resolution, and expansion are over.
4048 Mark_Elaboration_Attributes
4053 Formals
:= Parameter_Specifications
(Spec
);
4055 if Present
(Formals
) then
4056 Process_Formals
(Formals
, Spec
);
4059 if Nkind
(Spec
) = N_Function_Specification
then
4060 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
4061 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
4062 Set_Etype
(Id
, Result_Type
);
4064 -- Check restriction imposed by AI05-073: a generic function
4065 -- cannot return an abstract type or an access to such.
4067 if Is_Abstract_Type
(Designated_Type
(Result_Type
)) then
4069 ("generic function cannot have an access result "
4070 & "that designates an abstract type", Spec
);
4074 Find_Type
(Result_Definition
(Spec
));
4075 Typ
:= Entity
(Result_Definition
(Spec
));
4077 if Is_Abstract_Type
(Typ
)
4078 and then Ada_Version
>= Ada_2012
4081 ("generic function cannot have abstract result type", Spec
);
4084 -- If a null exclusion is imposed on the result type, then create
4085 -- a null-excluding itype (an access subtype) and use it as the
4086 -- function's Etype.
4088 if Is_Access_Type
(Typ
)
4089 and then Null_Exclusion_Present
(Spec
)
4092 Create_Null_Excluding_Itype
4094 Related_Nod
=> Spec
,
4095 Scope_Id
=> Defining_Unit_Name
(Spec
)));
4097 Set_Etype
(Id
, Typ
);
4102 Set_Etype
(Id
, Standard_Void_Type
);
4105 Set_Is_Not_Self_Hidden
(Id
);
4107 -- Analyze the aspects of the generic copy to ensure that all generated
4108 -- pragmas (if any) perform their semantic effects.
4110 Analyze_Aspect_Specifications
(N
, Id
);
4112 -- For a library unit, we have reconstructed the entity for the unit,
4113 -- and must reset it in the library tables. We also make sure that
4114 -- Body_Required is set properly in the original compilation unit node.
4116 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4117 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
4118 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
4121 -- If the generic appears within a package unit, the body of that unit
4122 -- has to be present for instantiation and inlining.
4124 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
4125 and then Unit_Requires_Body
(Id
)
4127 Set_Body_Needed_For_Inlining
4128 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
4131 Set_Categorization_From_Pragmas
(N
);
4132 Validate_Categorization_Dependency
(N
, Id
);
4134 -- Capture all global references that occur within the profile of the
4135 -- generic subprogram. Aspects are not part of this processing because
4136 -- they must be delayed. If processed now, Save_Global_References will
4137 -- destroy the Associated_Node links and prevent the capture of global
4138 -- references when the contract of the generic subprogram is analyzed.
4140 Save_Global_References
(Original_Node
(N
));
4144 Exit_Generic_Scope
(Id
);
4145 Generate_Reference_To_Formals
(Id
);
4147 List_Inherited_Pre_Post_Aspects
(Id
);
4148 end Analyze_Generic_Subprogram_Declaration
;
4150 -----------------------------------
4151 -- Analyze_Package_Instantiation --
4152 -----------------------------------
4154 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
4155 -- must be replaced by gotos which jump to the end of the routine in order
4156 -- to restore the Ghost and SPARK modes.
4158 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
4159 Has_Inline_Always
: Boolean := False;
4160 -- Set if the generic unit contains any subprograms with Inline_Always.
4161 -- Only relevant when back-end inlining is not enabled.
4163 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean;
4164 -- Return True if inlining is active and Gen_Unit contains inlined
4165 -- subprograms. In this case, we may either instantiate the body when
4166 -- front-end inlining is enabled, or add a pending instantiation when
4167 -- back-end inlining is enabled. In the former case, this may cause
4168 -- superfluous instantiations, but in either case we need to perform
4169 -- the instantiation of the body in the context of the instance and
4170 -- not in that of the point of inlining.
4172 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean;
4173 -- Return True if Gen_Unit needs to have its body instantiated in the
4174 -- context of N. This in particular excludes generic contexts.
4176 -----------------------
4177 -- Might_Inline_Subp --
4178 -----------------------
4180 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean is
4184 if Inline_Processing_Required
then
4185 -- No need to recompute the answer if we know it is positive
4186 -- and back-end inlining is enabled.
4188 if Is_Inlined
(Gen_Unit
) and then Back_End_Inlining
then
4192 E
:= First_Entity
(Gen_Unit
);
4193 while Present
(E
) loop
4194 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
4195 -- Remember if there are any subprograms with Inline_Always
4197 if Has_Pragma_Inline_Always
(E
) then
4198 Has_Inline_Always
:= True;
4201 Set_Is_Inlined
(Gen_Unit
);
4210 end Might_Inline_Subp
;
4212 -------------------------------
4213 -- Needs_Body_Instantiated --
4214 -------------------------------
4216 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean is
4218 -- No need to instantiate bodies in generic units
4220 if Is_Generic_Unit
(Cunit_Entity
(Main_Unit
)) then
4224 -- If the instantiation is in the main unit, then the body is needed
4226 if Is_In_Main_Unit
(N
) then
4230 -- In GNATprove mode, never instantiate bodies outside of the main
4231 -- unit, as it does not use frontend/backend inlining in the way that
4232 -- GNAT does, so does not benefit from such instantiations. On the
4233 -- contrary, such instantiations may bring artificial constraints,
4234 -- as for example such bodies may require preprocessing.
4236 if GNATprove_Mode
then
4240 -- If not, then again no need to instantiate bodies in generic units
4242 if Is_Generic_Unit
(Cunit_Entity
(Get_Code_Unit
(N
))) then
4246 -- Here we have a special handling for back-end inlining: if inline
4247 -- processing is required, then we unconditionally want to have the
4248 -- body instantiated. The reason is that Might_Inline_Subp does not
4249 -- catch all the cases (as it does not recurse into nested packages)
4250 -- so this avoids the need to patch things up afterwards. Moreover,
4251 -- these instantiations are only performed on demand when back-end
4252 -- inlining is enabled, so this causes very little extra work.
4254 if Inline_Processing_Required
and then Back_End_Inlining
then
4258 -- We want to have the bodies instantiated in non-main units if
4259 -- they might contribute inlined subprograms.
4261 return Might_Inline_Subp
(Gen_Unit
);
4262 end Needs_Body_Instantiated
;
4264 -- Local declarations
4266 Gen_Id
: constant Node_Id
:= Name
(N
);
4267 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
4268 Is_Actual_Pack
: constant Boolean := Is_Internal
(Inst_Id
);
4269 Loc
: constant Source_Ptr
:= Sloc
(N
);
4271 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4272 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
4273 Saved_ISMP
: constant Boolean :=
4274 Ignore_SPARK_Mode_Pragmas_In_Instance
;
4275 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4276 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4277 -- Save the Ghost and SPARK mode-related data to restore on exit
4279 Saved_Style_Check
: constant Boolean := Style_Check
;
4280 -- Save style check mode for restore on exit
4283 Act_Decl_Name
: Node_Id
;
4284 Act_Decl_Id
: Entity_Id
;
4287 Env_Installed
: Boolean := False;
4290 Gen_Unit
: Entity_Id
;
4291 Inline_Now
: Boolean := False;
4292 Needs_Body
: Boolean;
4293 Parent_Installed
: Boolean := False;
4294 Renaming_List
: List_Id
;
4295 Unit_Renaming
: Node_Id
;
4297 Vis_Prims_List
: Elist_Id
:= No_Elist
;
4298 -- List of primitives made temporarily visible in the instantiation
4299 -- to match the visibility of the formal type
4301 -- Start of processing for Analyze_Package_Instantiation
4304 -- Preserve relevant elaboration-related attributes of the context which
4305 -- are no longer available or very expensive to recompute once analysis,
4306 -- resolution, and expansion are over.
4308 Mark_Elaboration_Attributes
4315 -- Very first thing: check for Text_IO special unit in case we are
4316 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
4318 Check_Text_IO_Special_Unit
(Name
(N
));
4320 -- Make node global for error reporting
4322 Instantiation_Node
:= N
;
4324 -- Case of instantiation of a generic package
4326 if Nkind
(N
) = N_Package_Instantiation
then
4327 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4329 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
4331 Make_Defining_Program_Unit_Name
(Loc
,
4333 New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
4334 Defining_Identifier
=> Act_Decl_Id
);
4336 Act_Decl_Name
:= Act_Decl_Id
;
4339 -- Case of instantiation of a formal package
4342 Act_Decl_Id
:= Defining_Identifier
(N
);
4343 Act_Decl_Name
:= Act_Decl_Id
;
4346 Generate_Definition
(Act_Decl_Id
);
4347 Mutate_Ekind
(Act_Decl_Id
, E_Package
);
4348 Set_Is_Not_Self_Hidden
(Act_Decl_Id
);
4350 -- Initialize list of incomplete actuals before analysis
4352 Set_Incomplete_Actuals
(Act_Decl_Id
, New_Elmt_List
);
4354 Preanalyze_Actuals
(N
, Act_Decl_Id
);
4356 -- Turn off style checking in instances. If the check is enabled on the
4357 -- generic unit, a warning in an instance would just be noise. If not
4358 -- enabled on the generic, then a warning in an instance is just wrong.
4359 -- This must be done after analyzing the actuals, which do come from
4360 -- source and are subject to style checking.
4362 Style_Check
:= False;
4365 Env_Installed
:= True;
4367 -- Reset renaming map for formal types. The mapping is established
4368 -- when analyzing the generic associations, but some mappings are
4369 -- inherited from formal packages of parent units, and these are
4370 -- constructed when the parents are installed.
4372 Generic_Renamings
.Set_Last
(0);
4373 Generic_Renamings_HTable
.Reset
;
4375 -- Except for an abbreviated instance created to check a formal package,
4376 -- install the parent if this is a generic child unit.
4378 if not Is_Abbreviated_Instance
(Inst_Id
) then
4379 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4382 Gen_Unit
:= Entity
(Gen_Id
);
4384 -- A package instantiation is Ghost when it is subject to pragma Ghost
4385 -- or the generic template is Ghost. Set the mode now to ensure that
4386 -- any nodes generated during analysis and expansion are marked as
4389 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
4391 -- Verify that it is the name of a generic package
4393 -- A visibility glitch: if the instance is a child unit and the generic
4394 -- is the generic unit of a parent instance (i.e. both the parent and
4395 -- the child units are instances of the same package) the name now
4396 -- denotes the renaming within the parent, not the intended generic
4397 -- unit. See if there is a homonym that is the desired generic. The
4398 -- renaming declaration must be visible inside the instance of the
4399 -- child, but not when analyzing the name in the instantiation itself.
4401 if Ekind
(Gen_Unit
) = E_Package
4402 and then Present
(Renamed_Entity
(Gen_Unit
))
4403 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
4404 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
4405 and then Present
(Homonym
(Gen_Unit
))
4407 Gen_Unit
:= Homonym
(Gen_Unit
);
4410 if Etype
(Gen_Unit
) = Any_Type
then
4414 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
4416 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
4418 if From_Limited_With
(Gen_Unit
) then
4420 ("cannot instantiate a limited withed package", Gen_Id
);
4423 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
4430 if In_Extended_Main_Source_Unit
(N
) then
4431 Set_Is_Instantiated
(Gen_Unit
);
4432 Generate_Reference
(Gen_Unit
, N
);
4434 if Present
(Renamed_Entity
(Gen_Unit
)) then
4435 Set_Is_Instantiated
(Renamed_Entity
(Gen_Unit
));
4436 Generate_Reference
(Renamed_Entity
(Gen_Unit
), N
);
4440 if Nkind
(Gen_Id
) = N_Identifier
4441 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4444 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4446 elsif Nkind
(Gen_Id
) = N_Expanded_Name
4447 and then Is_Child_Unit
(Gen_Unit
)
4448 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
4449 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
4452 ("& is hidden within declaration of instance", Prefix
(Gen_Id
));
4455 Set_Entity
(Gen_Id
, Gen_Unit
);
4457 -- If generic is a renaming, get original generic unit
4459 if Present
(Renamed_Entity
(Gen_Unit
))
4460 and then Ekind
(Renamed_Entity
(Gen_Unit
)) = E_Generic_Package
4462 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
4465 -- Verify that there are no circular instantiations
4467 if In_Open_Scopes
(Gen_Unit
) then
4468 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4472 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4473 Error_Msg_Node_2
:= Current_Scope
;
4475 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
4476 Circularity_Detected
:= True;
4481 Mutate_Ekind
(Inst_Id
, E_Package
);
4482 Set_Scope
(Inst_Id
, Current_Scope
);
4484 -- If the context of the instance is subject to SPARK_Mode "off" or
4485 -- the annotation is altogether missing, set the global flag which
4486 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
4489 if SPARK_Mode
/= On
then
4490 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4492 -- Mark the instance spec in case the body is instantiated at a
4493 -- later pass. This preserves the original context in effect for
4496 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
4499 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4500 Gen_Spec
:= Specification
(Gen_Decl
);
4502 -- Initialize renamings map, for error checking, and the list that
4503 -- holds private entities whose views have changed between generic
4504 -- definition and instantiation. If this is the instance created to
4505 -- validate an actual package, the instantiation environment is that
4506 -- of the enclosing instance.
4508 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
4510 -- Copy original generic tree, to produce text for instantiation
4514 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4516 Act_Spec
:= Specification
(Act_Tree
);
4518 -- If this is the instance created to validate an actual package,
4519 -- only the formals matter, do not examine the package spec itself.
4521 if Is_Actual_Pack
then
4522 Set_Visible_Declarations
(Act_Spec
, New_List
);
4523 Set_Private_Declarations
(Act_Spec
, New_List
);
4527 Analyze_Associations
4529 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4530 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4532 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4534 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
4535 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
4536 Set_Is_Generic_Instance
(Act_Decl_Id
);
4537 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4539 -- References to the generic in its own declaration or its body are
4540 -- references to the instance. Add a renaming declaration for the
4541 -- generic unit itself. This declaration, as well as the renaming
4542 -- declarations for the generic formals, must remain private to the
4543 -- unit: the formals, because this is the language semantics, and
4544 -- the unit because its use is an artifact of the implementation.
4547 Make_Package_Renaming_Declaration
(Loc
,
4548 Defining_Unit_Name
=>
4549 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
4550 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
4552 Append
(Unit_Renaming
, Renaming_List
);
4554 -- The renaming declarations are the first local declarations of the
4557 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
4559 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
4561 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
4564 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
4566 -- Propagate the aspect specifications from the package declaration
4567 -- template to the instantiated version of the package declaration.
4569 if Has_Aspects
(Act_Tree
) then
4570 Set_Aspect_Specifications
(Act_Decl
,
4571 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
4574 -- The generic may have a generated Default_Storage_Pool aspect,
4575 -- set at the point of generic declaration. If the instance has
4576 -- that aspect, it overrides the one inherited from the generic.
4578 if Has_Aspects
(Gen_Spec
) then
4579 if No
(Aspect_Specifications
(N
)) then
4580 Set_Aspect_Specifications
(N
,
4582 (Aspect_Specifications
(Gen_Spec
))));
4586 Inherited_Aspects
: constant List_Id
:=
4588 (Aspect_Specifications
(Gen_Spec
));
4592 Pool_Present
: Boolean := False;
4595 ASN1
:= First
(Aspect_Specifications
(N
));
4596 while Present
(ASN1
) loop
4597 if Chars
(Identifier
(ASN1
)) =
4598 Name_Default_Storage_Pool
4600 Pool_Present
:= True;
4607 if Pool_Present
then
4609 -- If generic carries a default storage pool, remove it
4610 -- in favor of the instance one.
4612 ASN2
:= First
(Inherited_Aspects
);
4613 while Present
(ASN2
) loop
4614 if Chars
(Identifier
(ASN2
)) =
4615 Name_Default_Storage_Pool
4626 (Aspect_Specifications
(N
), Inherited_Aspects
);
4631 -- Save the instantiation node for a subsequent instantiation of the
4632 -- body if there is one and it needs to be instantiated here.
4634 -- We instantiate the body only if we are generating code, or if we
4635 -- are generating cross-reference information, or for GNATprove use.
4638 Enclosing_Body_Present
: Boolean := False;
4639 -- If the generic unit is not a compilation unit, then a body may
4640 -- be present in its parent even if none is required. We create a
4641 -- tentative pending instantiation for the body, which will be
4642 -- discarded if none is actually present.
4647 if Scope
(Gen_Unit
) /= Standard_Standard
4648 and then not Is_Child_Unit
(Gen_Unit
)
4650 Scop
:= Scope
(Gen_Unit
);
4651 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
4652 if Unit_Requires_Body
(Scop
) then
4653 Enclosing_Body_Present
:= True;
4656 elsif In_Open_Scopes
(Scop
)
4657 and then In_Package_Body
(Scop
)
4659 Enclosing_Body_Present
:= True;
4663 exit when Is_Compilation_Unit
(Scop
);
4664 Scop
:= Scope
(Scop
);
4668 -- If front-end inlining is enabled or there are any subprograms
4669 -- marked with Inline_Always, and this is a unit for which code
4670 -- will be generated, we instantiate the body at once.
4672 -- This is done if the instance is not the main unit, and if the
4673 -- generic is not a child unit of another generic, to avoid scope
4674 -- problems and the reinstallation of parent instances.
4677 and then (not Is_Child_Unit
(Gen_Unit
)
4678 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4679 and then Might_Inline_Subp
(Gen_Unit
)
4680 and then not Is_Actual_Pack
4682 if not Back_End_Inlining
4683 and then (Front_End_Inlining
or else Has_Inline_Always
)
4684 and then (Is_In_Main_Unit
(N
)
4685 or else In_Main_Context
(Current_Scope
))
4686 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4690 -- In configurable_run_time mode we force the inlining of
4691 -- predefined subprograms marked Inline_Always, to minimize
4692 -- the use of the run-time library.
4694 elsif In_Predefined_Unit
(Gen_Decl
)
4695 and then Configurable_Run_Time_Mode
4696 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4701 -- If the current scope is itself an instance within a child
4702 -- unit, there will be duplications in the scope stack, and the
4703 -- unstacking mechanism in Inline_Instance_Body will fail.
4704 -- This loses some rare cases of optimization.
4706 if Is_Generic_Instance
(Current_Scope
) then
4708 Curr_Unit
: constant Entity_Id
:=
4709 Cunit_Entity
(Current_Sem_Unit
);
4711 if Curr_Unit
/= Current_Scope
4712 and then Is_Child_Unit
(Curr_Unit
)
4714 Inline_Now
:= False;
4721 (Unit_Requires_Body
(Gen_Unit
)
4722 or else Enclosing_Body_Present
4723 or else Present
(Corresponding_Body
(Gen_Decl
)))
4724 and then Needs_Body_Instantiated
(Gen_Unit
)
4725 and then not Is_Actual_Pack
4726 and then not Inline_Now
4727 and then (Operating_Mode
= Generate_Code
4728 or else (Operating_Mode
= Check_Semantics
4729 and then GNATprove_Mode
));
4731 -- If front-end inlining is enabled or there are any subprograms
4732 -- marked with Inline_Always, do not instantiate body when within
4733 -- a generic context.
4735 if not Back_End_Inlining
4736 and then (Front_End_Inlining
or else Has_Inline_Always
)
4737 and then not Expander_Active
4739 Needs_Body
:= False;
4742 -- If the current context is generic, and the package being
4743 -- instantiated is declared within a formal package, there is no
4744 -- body to instantiate until the enclosing generic is instantiated
4745 -- and there is an actual for the formal package. If the formal
4746 -- package has parameters, we build a regular package instance for
4747 -- it, that precedes the original formal package declaration.
4749 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4751 Decl
: constant Node_Id
:=
4753 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4755 if Nkind
(Decl
) = N_Formal_Package_Declaration
4756 or else (Nkind
(Decl
) = N_Package_Declaration
4757 and then Is_List_Member
(Decl
)
4758 and then Present
(Next
(Decl
))
4760 Nkind
(Next
(Decl
)) =
4761 N_Formal_Package_Declaration
)
4763 Needs_Body
:= False;
4769 -- For RCI unit calling stubs, we omit the instance body if the
4770 -- instance is the RCI library unit itself.
4772 -- However there is a special case for nested instances: in this case
4773 -- we do generate the instance body, as it might be required, e.g.
4774 -- because it provides stream attributes for some type used in the
4775 -- profile of a remote subprogram. This is consistent with 12.3(12),
4776 -- which indicates that the instance body occurs at the place of the
4777 -- instantiation, and thus is part of the RCI declaration, which is
4778 -- present on all client partitions (this is E.2.3(18)).
4780 -- Note that AI12-0002 may make it illegal at some point to have
4781 -- stream attributes defined in an RCI unit, in which case this
4782 -- special case will become unnecessary. In the meantime, there
4783 -- is known application code in production that depends on this
4784 -- being possible, so we definitely cannot eliminate the body in
4785 -- the case of nested instances for the time being.
4787 -- When we generate a nested instance body, calling stubs for any
4788 -- relevant subprogram will be inserted immediately after the
4789 -- subprogram declarations, and will take precedence over the
4790 -- subsequent (original) body. (The stub and original body will be
4791 -- complete homographs, but this is permitted in an instance).
4792 -- (Could we do better and remove the original body???)
4794 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4795 and then Comes_From_Source
(N
)
4796 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4798 Needs_Body
:= False;
4801 -- If the context requires a full instantiation, set things up for
4802 -- subsequent construction of the body.
4806 Fin_Scop
, S
: Entity_Id
;
4809 Check_Forward_Instantiation
(Gen_Decl
);
4813 -- For a package instantiation that is not a compilation unit,
4814 -- indicate that cleanup actions of the innermost enclosing
4815 -- scope for which they are generated should be delayed until
4816 -- after the package body is instantiated.
4818 if Nkind
(N
) = N_Package_Instantiation
4819 and then not Is_Compilation_Unit
(Act_Decl_Id
)
4823 while S
/= Standard_Standard
loop
4824 -- Cleanup actions are not generated within generic units
4825 -- or in the formal part of generic units.
4827 if not Expander_Active
then
4830 -- For package scopes, cleanup actions are generated only
4831 -- for compilation units, for spec and body separately.
4833 elsif Ekind
(S
) = E_Package
then
4834 if Is_Compilation_Unit
(S
) then
4835 if In_Package_Body
(S
) then
4836 Fin_Scop
:= Body_Entity
(S
);
4841 Set_Delay_Cleanups
(Fin_Scop
);
4848 -- Cleanup actions are generated for all dynamic scopes
4852 Set_Delay_Cleanups
(Fin_Scop
);
4858 Add_Pending_Instantiation
(N
, Act_Decl
, Fin_Scop
);
4862 Set_Categorization_From_Pragmas
(Act_Decl
);
4864 if Parent_Installed
then
4868 Set_Instance_Spec
(N
, Act_Decl
);
4870 -- If not a compilation unit, insert the package declaration before
4871 -- the original instantiation node.
4873 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4874 Mark_Rewrite_Insertion
(Act_Decl
);
4875 Insert_Before
(N
, Act_Decl
);
4877 if Has_Aspects
(N
) then
4878 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4880 -- The pragma created for a Default_Storage_Pool aspect must
4881 -- appear ahead of the declarations in the instance spec.
4882 -- Analysis has placed it after the instance node, so remove
4883 -- it and reinsert it properly now.
4886 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4887 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4891 if A_Name
= Name_Default_Storage_Pool
then
4892 if No
(Visible_Declarations
(Act_Spec
)) then
4893 Set_Visible_Declarations
(Act_Spec
, New_List
);
4897 while Present
(Decl
) loop
4898 if Nkind
(Decl
) = N_Pragma
then
4900 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4912 -- For an instantiation that is a compilation unit, place
4913 -- declaration on current node so context is complete for analysis
4914 -- (including nested instantiations). If this is the main unit,
4915 -- the declaration eventually replaces the instantiation node.
4916 -- If the instance body is created later, it replaces the
4917 -- instance node, and the declaration is attached to it
4918 -- (see Build_Instance_Compilation_Unit_Nodes).
4921 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4923 -- The entity for the current unit is the newly created one,
4924 -- and all semantic information is attached to it.
4926 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4928 -- If this is the main unit, replace the main entity as well
4930 if Current_Sem_Unit
= Main_Unit
then
4931 Main_Unit_Entity
:= Act_Decl_Id
;
4935 Set_Unit
(Parent
(N
), Act_Decl
);
4936 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4937 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4939 -- Process aspect specifications of the instance node, if any, to
4940 -- take into account categorization pragmas before analyzing the
4943 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4946 Set_Unit
(Parent
(N
), N
);
4947 Set_Body_Required
(Parent
(N
), False);
4949 -- We never need elaboration checks on instantiations, since by
4950 -- definition, the body instantiation is elaborated at the same
4951 -- time as the spec instantiation.
4953 if Legacy_Elaboration_Checks
then
4954 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4955 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4959 if Legacy_Elaboration_Checks
then
4960 Check_Elab_Instantiation
(N
);
4963 -- Save the scenario for later examination by the ABE Processing
4966 Record_Elaboration_Scenario
(N
);
4968 -- The instantiation results in a guaranteed ABE
4970 if Is_Known_Guaranteed_ABE
(N
) and then Needs_Body
then
4971 -- Do not instantiate the corresponding body because gigi cannot
4972 -- handle certain types of premature instantiations.
4974 Remove_Dead_Instance
(N
);
4976 -- Create completing bodies for all subprogram declarations since
4977 -- their real bodies will not be instantiated.
4979 Provide_Completing_Bodies
(Instance_Spec
(N
));
4982 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4984 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4985 First_Private_Entity
(Act_Decl_Id
));
4987 -- If the instantiation needs a body, the unit will be turned into
4988 -- a package body and receive its own elaboration entity. Otherwise,
4989 -- the nature of the unit is now a package declaration.
4991 -- Note that the below rewriting means that Act_Decl, which has been
4992 -- analyzed and expanded, will be re-expanded as the rewritten N.
4994 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4995 and then not Needs_Body
4997 Rewrite
(N
, Act_Decl
);
5000 if Present
(Corresponding_Body
(Gen_Decl
))
5001 or else Unit_Requires_Body
(Gen_Unit
)
5003 Set_Has_Completion
(Act_Decl_Id
);
5006 Check_Formal_Packages
(Act_Decl_Id
);
5008 Restore_Hidden_Primitives
(Vis_Prims_List
);
5009 Restore_Private_Views
(Act_Decl_Id
);
5011 Inherit_Context
(Gen_Decl
, N
);
5013 if Parent_Installed
then
5018 Env_Installed
:= False;
5021 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5023 -- There used to be a check here to prevent instantiations in local
5024 -- contexts if the No_Local_Allocators restriction was active. This
5025 -- check was removed by a binding interpretation in AI-95-00130/07,
5026 -- but we retain the code for documentation purposes.
5028 -- if Ekind (Act_Decl_Id) /= E_Void
5029 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
5031 -- Check_Restriction (No_Local_Allocators, N);
5035 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
5038 -- Check that if N is an instantiation of System.Dim_Float_IO or
5039 -- System.Dim_Integer_IO, the formal type has a dimension system.
5041 if Nkind
(N
) = N_Package_Instantiation
5042 and then Is_Dim_IO_Package_Instantiation
(N
)
5045 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
5047 if not Has_Dimension_System
5048 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
5050 Error_Msg_N
("type with a dimension system expected", Assoc
);
5056 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5057 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5060 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5061 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5062 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5063 Style_Check
:= Saved_Style_Check
;
5066 when Instantiation_Error
=>
5067 if Parent_Installed
then
5071 if Env_Installed
then
5075 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5076 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5077 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5078 Style_Check
:= Saved_Style_Check
;
5079 end Analyze_Package_Instantiation
;
5081 --------------------------
5082 -- Inline_Instance_Body --
5083 --------------------------
5085 -- WARNING: This routine manages SPARK regions. Return statements must be
5086 -- replaced by gotos which jump to the end of the routine and restore the
5089 procedure Inline_Instance_Body
5091 Gen_Unit
: Entity_Id
;
5094 Config_Attrs
: constant Config_Switches_Type
:= Save_Config_Switches
;
5096 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5097 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
5098 Gen_Comp
: constant Entity_Id
:=
5099 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
5101 Scope_Stack_Depth
: constant Pos
:=
5102 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
5104 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5105 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5106 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
5108 Curr_Scope
: Entity_Id
:= Empty
;
5109 List
: Elist_Id
:= No_Elist
; -- init to avoid warning
5110 N_Instances
: Nat
:= 0;
5111 Num_Inner
: Nat
:= 0;
5112 Num_Scopes
: Nat
:= 0;
5113 Removed
: Boolean := False;
5118 -- Case of generic unit defined in another unit. We must remove the
5119 -- complete context of the current unit to install that of the generic.
5121 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
5123 -- Loop through enclosing scopes until we reach a generic instance,
5124 -- package body, or subprogram.
5127 while Present
(S
) and then S
/= Standard_Standard
loop
5129 -- Save use clauses from enclosing scopes into Use_Clauses
5132 Num_Scopes
:= Num_Scopes
+ 1;
5134 Use_Clauses
(Num_Scopes
) :=
5136 (Scope_Stack
.Last
- Num_Scopes
+ 1).First_Use_Clause
);
5137 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
5139 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
5140 or else Scope_Stack
.Table
5141 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
5144 exit when Is_Generic_Instance
(S
)
5145 and then (In_Package_Body
(S
)
5146 or else Ekind
(S
) = E_Procedure
5147 or else Ekind
(S
) = E_Function
);
5151 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
5153 -- Find and save all enclosing instances
5158 and then S
/= Standard_Standard
5160 if Is_Generic_Instance
(S
) then
5161 N_Instances
:= N_Instances
+ 1;
5162 Instances
(N_Instances
) := S
;
5164 exit when In_Package_Body
(S
);
5170 -- Remove context of current compilation unit, unless we are within a
5171 -- nested package instantiation, in which case the context has been
5172 -- removed previously.
5174 -- If current scope is the body of a child unit, remove context of
5175 -- spec as well. If an enclosing scope is an instance body, the
5176 -- context has already been removed, but the entities in the body
5177 -- must be made invisible as well.
5180 while Present
(S
) and then S
/= Standard_Standard
loop
5181 if Is_Generic_Instance
(S
)
5182 and then (In_Package_Body
(S
)
5183 or else Ekind
(S
) in E_Procedure | E_Function
)
5185 -- We still have to remove the entities of the enclosing
5186 -- instance from direct visibility.
5191 E
:= First_Entity
(S
);
5192 while Present
(E
) loop
5193 Set_Is_Immediately_Visible
(E
, False);
5202 or else (Ekind
(Curr_Unit
) = E_Package_Body
5203 and then S
= Spec_Entity
(Curr_Unit
))
5204 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
5205 and then S
= Corresponding_Spec
5206 (Unit_Declaration_Node
(Curr_Unit
)))
5210 -- Remove entities in current scopes from visibility, so that
5211 -- instance body is compiled in a clean environment.
5213 List
:= Save_Scope_Stack
(Handle_Use
=> False);
5215 if Is_Child_Unit
(S
) then
5217 -- Remove child unit from stack, as well as inner scopes.
5218 -- Removing the context of a child unit removes parent units
5221 while Current_Scope
/= S
loop
5222 Num_Inner
:= Num_Inner
+ 1;
5223 Inner_Scopes
(Num_Inner
) := Current_Scope
;
5228 Remove_Context
(Curr_Comp
);
5232 Remove_Context
(Curr_Comp
);
5235 if Ekind
(Curr_Unit
) = E_Package_Body
then
5236 Remove_Context
(Library_Unit
(Curr_Comp
));
5243 pragma Assert
(Num_Inner
< Num_Scopes
);
5245 Push_Scope
(Standard_Standard
);
5246 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
5248 -- The inlined package body is analyzed with the configuration state
5249 -- of the context prior to the scope manipulations performed above.
5251 -- ??? shouldn't this also use the warning state of the context prior
5252 -- to the scope manipulations?
5254 Instantiate_Package_Body
5257 Act_Decl
=> Act_Decl
,
5259 Config_Switches
=> Config_Attrs
,
5260 Current_Sem_Unit
=> Current_Sem_Unit
,
5261 Expander_Status
=> Expander_Active
,
5262 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5263 Scope_Suppress
=> Scope_Suppress
,
5264 Warnings
=> Save_Warnings
)),
5265 Inlined_Body
=> True);
5271 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
5273 -- Reset Generic_Instance flag so that use clauses can be installed
5274 -- in the proper order. (See Use_One_Package for effect of enclosing
5275 -- instances on processing of use clauses).
5277 for J
in 1 .. N_Instances
loop
5278 Set_Is_Generic_Instance
(Instances
(J
), False);
5282 Install_Context
(Curr_Comp
, Chain
=> False);
5284 if Present
(Curr_Scope
)
5285 and then Is_Child_Unit
(Curr_Scope
)
5287 Push_Scope
(Curr_Scope
);
5288 Set_Is_Immediately_Visible
(Curr_Scope
);
5290 -- Finally, restore inner scopes as well
5292 for J
in reverse 1 .. Num_Inner
loop
5293 Push_Scope
(Inner_Scopes
(J
));
5297 Restore_Scope_Stack
(List
, Handle_Use
=> False);
5299 if Present
(Curr_Scope
)
5301 (In_Private_Part
(Curr_Scope
)
5302 or else In_Package_Body
(Curr_Scope
))
5304 -- Install private declaration of ancestor units, which are
5305 -- currently available. Restore_Scope_Stack and Install_Context
5306 -- only install the visible part of parents.
5311 Par
:= Scope
(Curr_Scope
);
5312 while Present
(Par
) and then Par
/= Standard_Standard
loop
5313 Install_Private_Declarations
(Par
);
5320 -- Restore use clauses. For a child unit, use clauses in the parents
5321 -- are restored when installing the context, so only those in inner
5322 -- scopes (and those local to the child unit itself) need to be
5323 -- installed explicitly.
5325 if Is_Child_Unit
(Curr_Unit
) and then Removed
then
5326 for J
in reverse 1 .. Num_Inner
+ 1 loop
5327 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5329 Install_Use_Clauses
(Use_Clauses
(J
));
5333 for J
in reverse 1 .. Num_Scopes
loop
5334 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5336 Install_Use_Clauses
(Use_Clauses
(J
));
5340 -- Restore status of instances. If one of them is a body, make its
5341 -- local entities visible again.
5348 for J
in 1 .. N_Instances
loop
5349 Inst
:= Instances
(J
);
5350 Set_Is_Generic_Instance
(Inst
, True);
5352 if In_Package_Body
(Inst
)
5353 or else Ekind
(S
) in E_Procedure | E_Function
5355 E
:= First_Entity
(Instances
(J
));
5356 while Present
(E
) loop
5357 Set_Is_Immediately_Visible
(E
);
5364 -- If generic unit is in current unit, current context is correct. Note
5365 -- that the context is guaranteed to carry the correct SPARK_Mode as no
5366 -- enclosing scopes were removed.
5369 Instantiate_Package_Body
5372 Act_Decl
=> Act_Decl
,
5374 Config_Switches
=> Save_Config_Switches
,
5375 Current_Sem_Unit
=> Current_Sem_Unit
,
5376 Expander_Status
=> Expander_Active
,
5377 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5378 Scope_Suppress
=> Scope_Suppress
,
5379 Warnings
=> Save_Warnings
)),
5380 Inlined_Body
=> True);
5382 end Inline_Instance_Body
;
5384 -------------------------------------
5385 -- Analyze_Procedure_Instantiation --
5386 -------------------------------------
5388 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
5390 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
5391 end Analyze_Procedure_Instantiation
;
5393 -----------------------------------
5394 -- Need_Subprogram_Instance_Body --
5395 -----------------------------------
5397 function Need_Subprogram_Instance_Body
5399 Subp
: Entity_Id
) return Boolean
5401 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean;
5402 -- Return True if E is an inlined subprogram, an inlined renaming or a
5403 -- subprogram nested in an inlined subprogram. The inlining machinery
5404 -- totally disregards nested subprograms since it considers that they
5405 -- will always be compiled if the parent is (see Inline.Is_Nested).
5407 ------------------------------------
5408 -- Is_Inlined_Or_Child_Of_Inlined --
5409 ------------------------------------
5411 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean is
5415 if Is_Inlined
(E
) or else Is_Inlined
(Alias
(E
)) then
5420 while Scop
/= Standard_Standard
loop
5421 if Is_Subprogram
(Scop
) and then Is_Inlined
(Scop
) then
5425 Scop
:= Scope
(Scop
);
5429 end Is_Inlined_Or_Child_Of_Inlined
;
5432 -- Must be in the main unit or inlined (or child of inlined)
5434 if (Is_In_Main_Unit
(N
) or else Is_Inlined_Or_Child_Of_Inlined
(Subp
))
5436 -- Must be generating code or analyzing code in GNATprove mode
5438 and then (Operating_Mode
= Generate_Code
5439 or else (Operating_Mode
= Check_Semantics
5440 and then GNATprove_Mode
))
5442 -- The body is needed when generating code (full expansion) and in
5443 -- in GNATprove mode (special expansion) for formal verification of
5446 and then (Expander_Active
or GNATprove_Mode
)
5448 -- No point in inlining if ABE is inevitable
5450 and then not Is_Known_Guaranteed_ABE
(N
)
5452 -- Or if subprogram is eliminated
5454 and then not Is_Eliminated
(Subp
)
5456 Add_Pending_Instantiation
(N
, Unit_Declaration_Node
(Subp
));
5459 -- Here if not inlined, or we ignore the inlining
5464 end Need_Subprogram_Instance_Body
;
5466 --------------------------------------
5467 -- Analyze_Subprogram_Instantiation --
5468 --------------------------------------
5470 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
5471 -- must be replaced by gotos which jump to the end of the routine in order
5472 -- to restore the Ghost and SPARK modes.
5474 procedure Analyze_Subprogram_Instantiation
5478 Errs
: constant Nat
:= Serious_Errors_Detected
;
5479 Gen_Id
: constant Node_Id
:= Name
(N
);
5480 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
5481 Anon_Id
: constant Entity_Id
:=
5482 Make_Defining_Identifier
(Sloc
(Inst_Id
),
5483 Chars
=> New_External_Name
(Chars
(Inst_Id
), 'R'));
5484 Loc
: constant Source_Ptr
:= Sloc
(N
);
5486 Act_Decl_Id
: Entity_Id
:= Empty
; -- init to avoid warning
5491 Env_Installed
: Boolean := False;
5492 Gen_Unit
: Entity_Id
;
5494 Pack_Id
: Entity_Id
;
5495 Parent_Installed
: Boolean := False;
5497 Renaming_List
: List_Id
;
5498 -- The list of declarations that link formals and actuals of the
5499 -- instance. These are subtype declarations for formal types, and
5500 -- renaming declarations for other formals. The subprogram declaration
5501 -- for the instance is then appended to the list, and the last item on
5502 -- the list is the renaming declaration for the instance.
5504 procedure Analyze_Instance_And_Renamings
;
5505 -- The instance must be analyzed in a context that includes the mappings
5506 -- of generic parameters into actuals. We create a package declaration
5507 -- for this purpose, and a subprogram with an internal name within the
5508 -- package. The subprogram instance is simply an alias for the internal
5509 -- subprogram, declared in the current scope.
5511 procedure Build_Subprogram_Renaming
;
5512 -- If the subprogram is recursive, there are occurrences of the name of
5513 -- the generic within the body, which must resolve to the current
5514 -- instance. We add a renaming declaration after the declaration, which
5515 -- is available in the instance body, as well as in the analysis of
5516 -- aspects that appear in the generic. This renaming declaration is
5517 -- inserted after the instance declaration which it renames.
5519 ------------------------------------
5520 -- Analyze_Instance_And_Renamings --
5521 ------------------------------------
5523 procedure Analyze_Instance_And_Renamings
is
5524 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
5525 Pack_Decl
: Node_Id
;
5528 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5530 -- For the case of a compilation unit, the container package has
5531 -- the same name as the instantiation, to insure that the binder
5532 -- calls the elaboration procedure with the right name. Copy the
5533 -- entity of the instance, which may have compilation level flags
5534 -- (e.g. Is_Child_Unit) set.
5536 Pack_Id
:= New_Copy
(Def_Ent
);
5539 -- Otherwise we use the name of the instantiation concatenated
5540 -- with its source position to ensure uniqueness if there are
5541 -- several instantiations with the same name.
5544 Make_Defining_Identifier
(Loc
,
5545 Chars
=> New_External_Name
5546 (Related_Id
=> Chars
(Def_Ent
),
5548 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
5552 Make_Package_Declaration
(Loc
,
5553 Specification
=> Make_Package_Specification
(Loc
,
5554 Defining_Unit_Name
=> Pack_Id
,
5555 Visible_Declarations
=> Renaming_List
,
5556 End_Label
=> Empty
));
5558 Set_Instance_Spec
(N
, Pack_Decl
);
5559 Set_Is_Generic_Instance
(Pack_Id
);
5560 Set_Debug_Info_Needed
(Pack_Id
);
5562 -- Case of not a compilation unit
5564 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5565 Mark_Rewrite_Insertion
(Pack_Decl
);
5566 Insert_Before
(N
, Pack_Decl
);
5567 Set_Has_Completion
(Pack_Id
);
5569 -- Case of an instantiation that is a compilation unit
5571 -- Place declaration on current node so context is complete for
5572 -- analysis (including nested instantiations), and for use in a
5573 -- context_clause (see Analyze_With_Clause).
5576 Set_Unit
(Parent
(N
), Pack_Decl
);
5577 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
5580 Analyze
(Pack_Decl
);
5581 Check_Formal_Packages
(Pack_Id
);
5583 -- Body of the enclosing package is supplied when instantiating the
5584 -- subprogram body, after semantic analysis is completed.
5586 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5588 -- Remove package itself from visibility, so it does not
5589 -- conflict with subprogram.
5591 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
5593 -- Set name and scope of internal subprogram so that the proper
5594 -- external name will be generated. The proper scope is the scope
5595 -- of the wrapper package. We need to generate debugging info for
5596 -- the internal subprogram, so set flag accordingly.
5598 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
5599 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
5601 -- Mark wrapper package as referenced, to avoid spurious warnings
5602 -- if the instantiation appears in various with_ clauses of
5603 -- subunits of the main unit.
5605 Set_Referenced
(Pack_Id
);
5608 Set_Is_Generic_Instance
(Anon_Id
);
5609 Set_Debug_Info_Needed
(Anon_Id
);
5610 Act_Decl_Id
:= New_Copy
(Anon_Id
);
5612 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5613 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5614 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5616 -- Subprogram instance comes from source only if generic does
5618 Preserve_Comes_From_Source
(Act_Decl_Id
, Gen_Unit
);
5620 -- If the instance is a child unit, mark the Id accordingly. Mark
5621 -- the anonymous entity as well, which is the real subprogram and
5622 -- which is used when the instance appears in a context clause.
5623 -- Similarly, propagate the Is_Eliminated flag to handle properly
5624 -- nested eliminated subprograms.
5626 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5627 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5628 New_Overloaded_Entity
(Act_Decl_Id
);
5629 Check_Eliminated
(Act_Decl_Id
);
5630 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5632 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5634 -- In compilation unit case, kill elaboration checks on the
5635 -- instantiation, since they are never needed - the body is
5636 -- instantiated at the same point as the spec.
5638 if Legacy_Elaboration_Checks
then
5639 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5640 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5643 Set_Is_Compilation_Unit
(Anon_Id
);
5644 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5647 -- The instance is not a freezing point for the new subprogram.
5648 -- The anonymous subprogram may have a freeze node, created for
5649 -- some delayed aspects. This freeze node must not be inherited
5650 -- by the visible subprogram entity.
5652 Set_Is_Frozen
(Act_Decl_Id
, False);
5653 Set_Freeze_Node
(Act_Decl_Id
, Empty
);
5655 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5656 Valid_Operator_Definition
(Act_Decl_Id
);
5659 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5660 Set_Has_Completion
(Act_Decl_Id
);
5661 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5663 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5664 Set_Body_Required
(Parent
(N
), False);
5666 end Analyze_Instance_And_Renamings
;
5668 -------------------------------
5669 -- Build_Subprogram_Renaming --
5670 -------------------------------
5672 procedure Build_Subprogram_Renaming
is
5673 Renaming_Decl
: Node_Id
;
5674 Unit_Renaming
: Node_Id
;
5678 Make_Subprogram_Renaming_Declaration
(Loc
,
5681 (Specification
(Original_Node
(Gen_Decl
)),
5683 Instantiating
=> True),
5684 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
5686 -- The generic may be a child unit. The renaming needs an identifier
5687 -- with the proper name.
5689 Set_Defining_Unit_Name
(Specification
(Unit_Renaming
),
5690 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)));
5692 -- If there is a formal subprogram with the same name as the unit
5693 -- itself, do not add this renaming declaration, to prevent
5694 -- ambiguities when there is a call with that name in the body.
5696 Renaming_Decl
:= First
(Renaming_List
);
5697 while Present
(Renaming_Decl
) loop
5698 if Nkind
(Renaming_Decl
) = N_Subprogram_Renaming_Declaration
5700 Chars
(Defining_Entity
(Renaming_Decl
)) = Chars
(Gen_Unit
)
5705 Next
(Renaming_Decl
);
5708 if No
(Renaming_Decl
) then
5709 Append
(Unit_Renaming
, Renaming_List
);
5711 end Build_Subprogram_Renaming
;
5715 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5716 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
5717 Saved_ISMP
: constant Boolean :=
5718 Ignore_SPARK_Mode_Pragmas_In_Instance
;
5719 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5720 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5721 -- Save the Ghost and SPARK mode-related data to restore on exit
5723 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5724 -- List of primitives made temporarily visible in the instantiation
5725 -- to match the visibility of the formal type
5727 -- Start of processing for Analyze_Subprogram_Instantiation
5730 -- Preserve relevant elaboration-related attributes of the context which
5731 -- are no longer available or very expensive to recompute once analysis,
5732 -- resolution, and expansion are over.
5734 Mark_Elaboration_Attributes
5741 -- Very first thing: check for special Text_IO unit in case we are
5742 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5743 -- such an instantiation is bogus (these are packages, not subprograms),
5744 -- but we get a better error message if we do this.
5746 Check_Text_IO_Special_Unit
(Gen_Id
);
5748 -- Make node global for error reporting
5750 Instantiation_Node
:= N
;
5752 -- For package instantiations we turn off style checks, because they
5753 -- will have been emitted in the generic. For subprogram instantiations
5754 -- we want to apply at least the check on overriding indicators so we
5755 -- do not modify the style check status.
5757 -- The renaming declarations for the actuals do not come from source and
5758 -- will not generate spurious warnings.
5760 Preanalyze_Actuals
(N
);
5763 Env_Installed
:= True;
5764 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5765 Gen_Unit
:= Entity
(Gen_Id
);
5767 -- A subprogram instantiation is Ghost when it is subject to pragma
5768 -- Ghost or the generic template is Ghost. Set the mode now to ensure
5769 -- that any nodes generated during analysis and expansion are marked as
5772 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
5774 Generate_Reference
(Gen_Unit
, Gen_Id
);
5776 if Nkind
(Gen_Id
) = N_Identifier
5777 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5780 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5783 if Etype
(Gen_Unit
) = Any_Type
then
5788 -- Verify that it is a generic subprogram of the right kind, and that
5789 -- it does not lead to a circular instantiation.
5791 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5793 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5795 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5797 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5799 elsif In_Open_Scopes
(Gen_Unit
) then
5800 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5803 Mutate_Ekind
(Inst_Id
, K
);
5804 Set_Scope
(Inst_Id
, Current_Scope
);
5806 Set_Entity
(Gen_Id
, Gen_Unit
);
5808 if In_Extended_Main_Source_Unit
(N
) then
5809 Set_Is_Instantiated
(Gen_Unit
);
5810 Generate_Reference
(Gen_Unit
, N
);
5813 -- If renaming, get original unit
5815 if Present
(Renamed_Entity
(Gen_Unit
))
5816 and then Is_Generic_Subprogram
(Renamed_Entity
(Gen_Unit
))
5818 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
5819 Set_Is_Instantiated
(Gen_Unit
);
5820 Generate_Reference
(Gen_Unit
, N
);
5823 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5824 Error_Msg_Node_2
:= Current_Scope
;
5826 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
5827 Circularity_Detected
:= True;
5828 Restore_Hidden_Primitives
(Vis_Prims_List
);
5832 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5834 -- Initialize renamings map, for error checking
5836 Generic_Renamings
.Set_Last
(0);
5837 Generic_Renamings_HTable
.Reset
;
5839 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
5841 -- Copy original generic tree, to produce text for instantiation
5845 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5847 -- Inherit overriding indicator from instance node
5849 Act_Spec
:= Specification
(Act_Tree
);
5850 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5851 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5854 Analyze_Associations
5856 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5857 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5859 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5861 -- The subprogram itself cannot contain a nested instance, so the
5862 -- current parent is left empty.
5864 Set_Instance_Env
(Gen_Unit
, Empty
);
5866 -- Build the subprogram declaration, which does not appear in the
5867 -- generic template, and give it a sloc consistent with that of the
5870 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5871 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5873 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5874 Specification
=> Act_Spec
);
5876 -- The aspects have been copied previously, but they have to be
5877 -- linked explicitly to the new subprogram declaration. Explicit
5878 -- pre/postconditions on the instance are analyzed below, in a
5881 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5882 Set_Categorization_From_Pragmas
(Act_Decl
);
5884 if Parent_Installed
then
5888 Append
(Act_Decl
, Renaming_List
);
5890 -- Contract-related source pragmas that follow a generic subprogram
5891 -- must be instantiated explicitly because they are not part of the
5892 -- subprogram template.
5894 Instantiate_Subprogram_Contract
5895 (Original_Node
(Gen_Decl
), Renaming_List
);
5897 Build_Subprogram_Renaming
;
5899 -- If the context of the instance is subject to SPARK_Mode "off" or
5900 -- the annotation is altogether missing, set the global flag which
5901 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5902 -- the instance. This should be done prior to analyzing the instance.
5904 if SPARK_Mode
/= On
then
5905 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
5908 -- If the context of an instance is not subject to SPARK_Mode "off",
5909 -- and the generic spec is subject to an explicit SPARK_Mode pragma,
5910 -- the latter should be the one applicable to the instance.
5912 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5913 and then Saved_SM
/= Off
5914 and then Present
(SPARK_Pragma
(Gen_Unit
))
5916 Set_SPARK_Mode
(Gen_Unit
);
5919 -- Need to mark Anon_Id intrinsic before calling
5920 -- Analyze_Instance_And_Renamings because this flag may be propagated
5923 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5924 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5925 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
5928 Analyze_Instance_And_Renamings
;
5930 -- Restore SPARK_Mode from the context after analysis of the package
5931 -- declaration, so that the SPARK_Mode on the generic spec does not
5932 -- apply to the pending instance for the instance body.
5934 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5935 and then Saved_SM
/= Off
5936 and then Present
(SPARK_Pragma
(Gen_Unit
))
5938 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5941 -- If the generic is marked Import (Intrinsic), then so is the
5942 -- instance; this indicates that there is no body to instantiate.
5943 -- We also copy the interface name in case this is handled by the
5944 -- back-end and deal with an instance of unchecked conversion.
5946 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5947 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5948 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
5950 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5951 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5955 -- Inherit convention from generic unit. Intrinsic convention, as for
5956 -- an instance of unchecked conversion, is not inherited because an
5957 -- explicit Ada instance has been created.
5959 if Has_Convention_Pragma
(Gen_Unit
)
5960 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5962 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5963 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5966 Generate_Definition
(Act_Decl_Id
);
5968 -- Inherit all inlining-related flags which apply to the generic in
5969 -- the subprogram and its declaration.
5971 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5972 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5974 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5975 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5977 Set_Has_Pragma_Inline_Always
5978 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5979 Set_Has_Pragma_Inline_Always
5980 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5982 Set_Has_Pragma_No_Inline
5983 (Act_Decl_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5984 Set_Has_Pragma_No_Inline
5985 (Anon_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5987 -- Propagate No_Return if pragma applied to generic unit. This must
5988 -- be done explicitly because pragma does not appear in generic
5989 -- declaration (unlike the aspect case).
5991 if No_Return
(Gen_Unit
) then
5992 Set_No_Return
(Act_Decl_Id
);
5993 Set_No_Return
(Anon_Id
);
5996 -- Mark both the instance spec and the anonymous package in case the
5997 -- body is instantiated at a later pass. This preserves the original
5998 -- context in effect for the body.
6000 if SPARK_Mode
/= On
then
6001 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
6002 Set_Ignore_SPARK_Mode_Pragmas
(Anon_Id
);
6005 if Legacy_Elaboration_Checks
6006 and then not Is_Intrinsic_Subprogram
(Gen_Unit
)
6008 Check_Elab_Instantiation
(N
);
6011 -- Save the scenario for later examination by the ABE Processing
6014 Record_Elaboration_Scenario
(N
);
6016 -- The instantiation results in a guaranteed ABE. Create a completing
6017 -- body for the subprogram declaration because the real body will not
6020 if Is_Known_Guaranteed_ABE
(N
) then
6021 Provide_Completing_Bodies
(Instance_Spec
(N
));
6024 if Is_Dispatching_Operation
(Act_Decl_Id
)
6025 and then Ada_Version
>= Ada_2005
6031 Formal
:= First_Formal
(Act_Decl_Id
);
6032 while Present
(Formal
) loop
6033 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
6034 and then Is_Controlling_Formal
(Formal
)
6035 and then not Can_Never_Be_Null
(Formal
)
6038 ("access parameter& is controlling,", N
, Formal
);
6040 ("\corresponding parameter of & must be explicitly "
6041 & "null-excluding", N
, Gen_Id
);
6044 Next_Formal
(Formal
);
6049 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
6051 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
6053 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
6054 Inherit_Context
(Gen_Decl
, N
);
6056 Restore_Private_Views
(Pack_Id
, False);
6058 -- If the context requires a full instantiation, mark node for
6059 -- subsequent construction of the body.
6061 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
6062 Check_Forward_Instantiation
(Gen_Decl
);
6064 -- The wrapper package is always delayed, because it does not
6065 -- constitute a freeze point, but to insure that the freeze node
6066 -- is placed properly, it is created directly when instantiating
6067 -- the body (otherwise the freeze node might appear to early for
6068 -- nested instantiations).
6070 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
6071 Rewrite
(N
, Unit
(Parent
(N
)));
6072 Set_Unit
(Parent
(N
), N
);
6075 -- Replace instance node for library-level instantiations of
6076 -- intrinsic subprograms.
6078 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
6079 Rewrite
(N
, Unit
(Parent
(N
)));
6080 Set_Unit
(Parent
(N
), N
);
6083 if Parent_Installed
then
6087 Restore_Hidden_Primitives
(Vis_Prims_List
);
6089 Env_Installed
:= False;
6090 Generic_Renamings
.Set_Last
(0);
6091 Generic_Renamings_HTable
.Reset
;
6095 -- Analyze aspects in declaration if no errors appear in the instance.
6097 if Has_Aspects
(N
) and then Serious_Errors_Detected
= Errs
then
6098 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
6101 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6102 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6103 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6106 when Instantiation_Error
=>
6107 if Parent_Installed
then
6111 if Env_Installed
then
6115 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6116 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6117 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6118 end Analyze_Subprogram_Instantiation
;
6120 ---------------------------
6121 -- Get_Associated_Entity --
6122 ---------------------------
6124 function Get_Associated_Entity
(Id
: Entity_Id
) return Entity_Id
is
6128 Assoc
:= Associated_Entity
(Id
);
6130 if Present
(Assoc
) then
6131 while Present
(Associated_Entity
(Assoc
)) loop
6132 Assoc
:= Associated_Entity
(Assoc
);
6137 end Get_Associated_Entity
;
6139 -------------------------
6140 -- Get_Associated_Node --
6141 -------------------------
6143 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
6147 Assoc
:= Associated_Node
(N
);
6149 if Nkind
(Assoc
) /= Nkind
(N
) then
6152 elsif Nkind
(Assoc
) in N_Aggregate | N_Extension_Aggregate
then
6156 -- If the node is part of an inner generic, it may itself have been
6157 -- remapped into a further generic copy. Associated_Node is otherwise
6158 -- used for the entity of the node, and will be of a different node
6159 -- kind, or else N has been rewritten as a literal or function call.
6161 while Present
(Associated_Node
(Assoc
))
6162 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
6164 Assoc
:= Associated_Node
(Assoc
);
6167 -- Follow an additional link in case the final node was rewritten.
6168 -- This can only happen with nested generic units.
6170 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
6171 and then Present
(Associated_Node
(Assoc
))
6172 and then Nkind
(Associated_Node
(Assoc
)) in N_Function_Call
6173 | N_Explicit_Dereference
6178 Assoc
:= Associated_Node
(Assoc
);
6181 -- An additional special case: an unconstrained type in an object
6182 -- declaration may have been rewritten as a local subtype constrained
6183 -- by the expression in the declaration. We need to recover the
6184 -- original entity, which may be global.
6186 if Present
(Original_Node
(Assoc
))
6187 and then Nkind
(Parent
(N
)) = N_Object_Declaration
6189 Assoc
:= Original_Node
(Assoc
);
6194 end Get_Associated_Node
;
6196 -----------------------------------
6197 -- Build_Subprogram_Decl_Wrapper --
6198 -----------------------------------
6200 function Build_Subprogram_Decl_Wrapper
6201 (Formal_Subp
: Entity_Id
) return Node_Id
6203 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6204 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6207 Parm_Spec
: Node_Id
;
6208 Profile
: List_Id
:= New_List
;
6215 Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
6216 Mutate_Ekind
(Subp
, Ekind
(Formal_Subp
));
6217 Set_Is_Generic_Actual_Subprogram
(Subp
);
6219 Profile
:= Parameter_Specifications
(
6221 (Specification
(Unit_Declaration_Node
(Formal_Subp
))));
6223 Form_F
:= First_Formal
(Formal_Subp
);
6224 Parm_Spec
:= First
(Profile
);
6226 -- Create new entities for the formals. Reset entities so that
6227 -- parameter types are properly resolved when wrapper declaration
6230 while Present
(Parm_Spec
) loop
6231 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
6232 Set_Defining_Identifier
(Parm_Spec
, New_F
);
6233 Set_Entity
(Parameter_Type
(Parm_Spec
), Empty
);
6235 Next_Formal
(Form_F
);
6238 if Ret_Type
= Standard_Void_Type
then
6240 Make_Procedure_Specification
(Loc
,
6241 Defining_Unit_Name
=> Subp
,
6242 Parameter_Specifications
=> Profile
);
6245 Make_Function_Specification
(Loc
,
6246 Defining_Unit_Name
=> Subp
,
6247 Parameter_Specifications
=> Profile
,
6248 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6252 Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
);
6255 end Build_Subprogram_Decl_Wrapper
;
6257 -----------------------------------
6258 -- Build_Subprogram_Body_Wrapper --
6259 -----------------------------------
6261 function Build_Subprogram_Body_Wrapper
6262 (Formal_Subp
: Entity_Id
;
6263 Actual_Name
: Node_Id
) return Node_Id
6265 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6266 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6267 Spec_Node
: constant Node_Id
:=
6269 (Build_Subprogram_Decl_Wrapper
(Formal_Subp
));
6272 Body_Node
: Node_Id
;
6275 Actuals
:= New_List
;
6276 Act
:= First
(Parameter_Specifications
(Spec_Node
));
6278 while Present
(Act
) loop
6280 Make_Identifier
(Loc
, Chars
(Defining_Identifier
(Act
))));
6284 if Ret_Type
= Standard_Void_Type
then
6285 Stmt
:= Make_Procedure_Call_Statement
(Loc
,
6286 Name
=> Actual_Name
,
6287 Parameter_Associations
=> Actuals
);
6290 Stmt
:= Make_Simple_Return_Statement
(Loc
,
6292 Make_Function_Call
(Loc
,
6293 Name
=> Actual_Name
,
6294 Parameter_Associations
=> Actuals
));
6297 Body_Node
:= Make_Subprogram_Body
(Loc
,
6298 Specification
=> Spec_Node
,
6299 Declarations
=> New_List
,
6300 Handled_Statement_Sequence
=>
6301 Make_Handled_Sequence_Of_Statements
(Loc
,
6302 Statements
=> New_List
(Stmt
)));
6305 end Build_Subprogram_Body_Wrapper
;
6307 -------------------------------------------
6308 -- Build_Instance_Compilation_Unit_Nodes --
6309 -------------------------------------------
6311 procedure Build_Instance_Compilation_Unit_Nodes
6316 Decl_Cunit
: Node_Id
;
6317 Body_Cunit
: Node_Id
;
6319 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
6320 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
6323 -- A new compilation unit node is built for the instance declaration.
6324 -- It relocates the auxiliary declaration node from the compilation unit
6325 -- where the instance appeared, so that declarations that originally
6326 -- followed the instance will be attached to the spec compilation unit.
6329 Make_Compilation_Unit
(Sloc
(N
),
6330 Context_Items
=> Empty_List
,
6332 Aux_Decls_Node
=> Relocate_Node
(Aux_Decls_Node
(Parent
(N
))));
6334 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
6336 -- The new compilation unit is linked to its body, but both share the
6337 -- same file, so we do not set Body_Required on the new unit so as not
6338 -- to create a spurious dependency on a non-existent body in the ali.
6339 -- This simplifies CodePeer unit traversal.
6341 -- We use the original instantiation compilation unit as the resulting
6342 -- compilation unit of the instance, since this is the main unit.
6344 Rewrite
(N
, Act_Body
);
6346 Body_Cunit
:= Parent
(N
);
6348 -- The two compilation unit nodes are linked by the Library_Unit field
6350 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
6351 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
6353 -- Preserve the private nature of the package if needed
6355 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
6357 -- If the instance is not the main unit, its context, categorization
6358 -- and elaboration entity are not relevant to the compilation.
6360 if Body_Cunit
/= Cunit
(Main_Unit
) then
6361 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
6365 -- The context clause items on the instantiation, which are now attached
6366 -- to the body compilation unit (since the body overwrote the original
6367 -- instantiation node), semantically belong on the spec, so copy them
6368 -- there. It's harmless to leave them on the body as well. In fact one
6369 -- could argue that they belong in both places.
6371 Citem
:= First
(Context_Items
(Body_Cunit
));
6372 while Present
(Citem
) loop
6373 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
6377 -- Propagate categorization flags on packages, so that they appear in
6378 -- the ali file for the spec of the unit.
6380 if Ekind
(New_Main
) = E_Package
then
6381 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
6382 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
6383 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
6384 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
6385 Set_Is_Remote_Call_Interface
6386 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
6389 -- Make entry in Units table, so that binder can generate call to
6390 -- elaboration procedure for body, if any.
6392 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
6393 Main_Unit_Entity
:= New_Main
;
6394 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
6396 -- Build elaboration entity, since the instance may certainly generate
6397 -- elaboration code requiring a flag for protection.
6399 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
6400 end Build_Instance_Compilation_Unit_Nodes
;
6402 --------------------------------
6403 -- Check_Abbreviated_Instance --
6404 --------------------------------
6406 procedure Check_Abbreviated_Instance
6408 Parent_Installed
: in out Boolean)
6410 Inst_Node
: Node_Id
;
6413 if Nkind
(N
) = N_Package_Specification
6414 and then Is_Abbreviated_Instance
(Defining_Entity
(N
))
6416 Inst_Node
:= Get_Unit_Instantiation_Node
(Defining_Entity
(N
));
6417 Check_Generic_Child_Unit
(Name
(Inst_Node
), Parent_Installed
);
6419 end Check_Abbreviated_Instance
;
6421 -----------------------------
6422 -- Check_Access_Definition --
6423 -----------------------------
6425 procedure Check_Access_Definition
(N
: Node_Id
) is
6428 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
6430 end Check_Access_Definition
;
6432 -----------------------------------
6433 -- Check_Formal_Package_Instance --
6434 -----------------------------------
6436 -- If the formal has specific parameters, they must match those of the
6437 -- actual. Both of them are instances, and the renaming declarations for
6438 -- their formal parameters appear in the same order in both. The analyzed
6439 -- formal has been analyzed in the context of the current instance.
6441 procedure Check_Formal_Package_Instance
6442 (Formal_Pack
: Entity_Id
;
6443 Actual_Pack
: Entity_Id
)
6445 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
6446 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
6447 Prev_E1
: Entity_Id
;
6452 procedure Check_Mismatch
(B
: Boolean);
6453 -- Common error routine for mismatch between the parameters of the
6454 -- actual instance and those of the formal package.
6456 function Is_Defaulted
(Param
: Entity_Id
) return Boolean;
6457 -- If the formal package has partly box-initialized formals, skip
6458 -- conformance check for these formals. Previously the code assumed
6459 -- that box initialization for a formal package applied to all its
6460 -- formal parameters.
6462 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
6463 -- The formal may come from a nested formal package, and the actual may
6464 -- have been constant-folded. To determine whether the two denote the
6465 -- same entity we may have to traverse several definitions to recover
6466 -- the ultimate entity that they refer to.
6468 function Same_Instantiated_Function
(E1
, E2
: Entity_Id
) return Boolean;
6469 -- The formal and the actual must be identical, but if both are
6470 -- given by attributes they end up renaming different generated bodies,
6471 -- and we must verify that the attributes themselves match.
6473 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
6474 -- Similarly, if the formal comes from a nested formal package, the
6475 -- actual may designate the formal through multiple renamings, which
6476 -- have to be followed to determine the original variable in question.
6478 --------------------
6479 -- Check_Mismatch --
6480 --------------------
6482 procedure Check_Mismatch
(B
: Boolean) is
6483 -- A Formal_Type_Declaration for a derived private type is rewritten
6484 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
6485 -- which is why we examine the original node.
6487 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(Parent
(E2
)));
6490 if Kind
= N_Formal_Type_Declaration
then
6493 elsif Kind
in N_Formal_Object_Declaration
6494 | N_Formal_Package_Declaration
6495 | N_Formal_Subprogram_Declaration
6499 -- Ada 2012: If both formal and actual are incomplete types they
6502 elsif Is_Incomplete_Type
(E1
) and then Is_Incomplete_Type
(E2
) then
6507 ("actual for & in actual instance does not match formal",
6508 Parent
(Actual_Pack
), E1
);
6516 function Is_Defaulted
(Param
: Entity_Id
) return Boolean is
6521 First
(Generic_Associations
(Parent
6522 (Associated_Formal_Package
(Actual_Pack
))));
6524 while Present
(Assoc
) loop
6525 if Nkind
(Assoc
) = N_Others_Choice
then
6528 elsif Nkind
(Assoc
) = N_Generic_Association
6529 and then Chars
(Selector_Name
(Assoc
)) = Chars
(Param
)
6531 return Box_Present
(Assoc
);
6540 --------------------------------
6541 -- Same_Instantiated_Constant --
6542 --------------------------------
6544 function Same_Instantiated_Constant
6545 (E1
, E2
: Entity_Id
) return Boolean
6551 while Present
(Ent
) loop
6555 elsif Ekind
(Ent
) /= E_Constant
then
6558 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
6559 if Entity
(Constant_Value
(Ent
)) = E1
then
6562 Ent
:= Entity
(Constant_Value
(Ent
));
6565 -- The actual may be a constant that has been folded. Recover
6568 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
6569 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
6577 end Same_Instantiated_Constant
;
6579 --------------------------------
6580 -- Same_Instantiated_Function --
6581 --------------------------------
6583 function Same_Instantiated_Function
6584 (E1
, E2
: Entity_Id
) return Boolean
6588 if Alias
(E1
) = Alias
(E2
) then
6591 elsif Present
(Alias
(E2
)) then
6592 U1
:= Original_Node
(Unit_Declaration_Node
(E1
));
6593 U2
:= Original_Node
(Unit_Declaration_Node
(Alias
(E2
)));
6595 return Nkind
(U1
) = N_Subprogram_Renaming_Declaration
6596 and then Nkind
(Name
(U1
)) = N_Attribute_Reference
6598 and then Nkind
(U2
) = N_Subprogram_Renaming_Declaration
6599 and then Nkind
(Name
(U2
)) = N_Attribute_Reference
6602 Attribute_Name
(Name
(U1
)) = Attribute_Name
(Name
(U2
));
6606 end Same_Instantiated_Function
;
6608 --------------------------------
6609 -- Same_Instantiated_Variable --
6610 --------------------------------
6612 function Same_Instantiated_Variable
6613 (E1
, E2
: Entity_Id
) return Boolean
6615 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
6616 -- Follow chain of renamings to the ultimate ancestor
6618 ---------------------
6619 -- Original_Entity --
6620 ---------------------
6622 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
6627 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
6628 and then Present
(Renamed_Object
(Orig
))
6629 and then Is_Entity_Name
(Renamed_Object
(Orig
))
6631 Orig
:= Entity
(Renamed_Object
(Orig
));
6635 end Original_Entity
;
6637 -- Start of processing for Same_Instantiated_Variable
6640 return Ekind
(E1
) = Ekind
(E2
)
6641 and then Original_Entity
(E1
) = Original_Entity
(E2
);
6642 end Same_Instantiated_Variable
;
6644 -- Start of processing for Check_Formal_Package_Instance
6648 while Present
(E1
) and then Present
(E2
) loop
6649 exit when Ekind
(E1
) = E_Package
6650 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
6652 -- If the formal is the renaming of the formal package, this
6653 -- is the end of its formal part, which may occur before the
6654 -- end of the formal part in the actual in the presence of
6655 -- defaulted parameters in the formal package.
6657 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
6658 and then Renamed_Entity
(E2
) = Scope
(E2
);
6660 -- The analysis of the actual may generate additional internal
6661 -- entities. If the formal is defaulted, there is no corresponding
6662 -- analysis and the internal entities must be skipped, until we
6663 -- find corresponding entities again.
6665 if Comes_From_Source
(E2
)
6666 and then not Comes_From_Source
(E1
)
6667 and then Chars
(E1
) /= Chars
(E2
)
6669 while Present
(E1
) and then Chars
(E1
) /= Chars
(E2
) loop
6677 -- Entities may be declared without full declaration, such as
6678 -- itypes and predefined operators (concatenation for arrays, eg).
6679 -- Skip it and keep the formal entity to find a later match for it.
6681 elsif No
(Parent
(E2
)) and then Ekind
(E1
) /= Ekind
(E2
) then
6685 -- If the formal entity comes from a formal declaration, it was
6686 -- defaulted in the formal package, and no check is needed on it.
6688 elsif Nkind
(Original_Node
(Parent
(E2
))) in
6689 N_Formal_Object_Declaration | N_Formal_Type_Declaration
6691 -- If the formal is a tagged type the corresponding class-wide
6692 -- type has been generated as well, and it must be skipped.
6694 if Is_Type
(E2
) and then Is_Tagged_Type
(E2
) then
6700 -- Ditto for defaulted formal subprograms.
6702 elsif Is_Overloadable
(E1
)
6703 and then Nkind
(Unit_Declaration_Node
(E2
)) in
6704 N_Formal_Subprogram_Declaration
6708 elsif Is_Defaulted
(E1
) then
6711 elsif Is_Type
(E1
) then
6713 -- Subtypes must statically match. E1, E2 are the local entities
6714 -- that are subtypes of the actuals. Itypes generated for other
6715 -- parameters need not be checked, the check will be performed
6716 -- on the parameters themselves.
6718 -- If E2 is a formal type declaration, it is a defaulted parameter
6719 -- and needs no checking.
6721 if not Is_Itype
(E1
) and then not Is_Itype
(E2
) then
6724 or else Etype
(E1
) /= Etype
(E2
)
6725 or else not Subtypes_Statically_Match
(E1
, E2
));
6728 elsif Ekind
(E1
) = E_Constant
then
6730 -- IN parameters must denote the same static value, or the same
6731 -- constant, or the literal null.
6733 Expr1
:= Expression
(Parent
(E1
));
6735 if Ekind
(E2
) /= E_Constant
then
6736 Check_Mismatch
(True);
6739 Expr2
:= Expression
(Parent
(E2
));
6742 if Is_OK_Static_Expression
(Expr1
) then
6743 if not Is_OK_Static_Expression
(Expr2
) then
6744 Check_Mismatch
(True);
6746 elsif Is_Discrete_Type
(Etype
(E1
)) then
6748 V1
: constant Uint
:= Expr_Value
(Expr1
);
6749 V2
: constant Uint
:= Expr_Value
(Expr2
);
6751 Check_Mismatch
(V1
/= V2
);
6754 elsif Is_Real_Type
(Etype
(E1
)) then
6756 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
6757 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
6759 Check_Mismatch
(V1
/= V2
);
6762 elsif Is_String_Type
(Etype
(E1
))
6763 and then Nkind
(Expr1
) = N_String_Literal
6765 if Nkind
(Expr2
) /= N_String_Literal
then
6766 Check_Mismatch
(True);
6769 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
6773 elsif Is_Entity_Name
(Expr1
) then
6774 if Is_Entity_Name
(Expr2
) then
6775 if Entity
(Expr1
) = Entity
(Expr2
) then
6779 (not Same_Instantiated_Constant
6780 (Entity
(Expr1
), Entity
(Expr2
)));
6784 Check_Mismatch
(True);
6787 elsif Is_Entity_Name
(Original_Node
(Expr1
))
6788 and then Is_Entity_Name
(Expr2
)
6789 and then Same_Instantiated_Constant
6790 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
6794 elsif Nkind
(Expr1
) = N_Null
then
6795 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
6798 Check_Mismatch
(True);
6801 elsif Ekind
(E1
) = E_Variable
then
6802 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
6804 elsif Ekind
(E1
) = E_Package
then
6806 (Ekind
(E1
) /= Ekind
(E2
)
6807 or else (Present
(Renamed_Entity
(E2
))
6808 and then Renamed_Entity
(E1
) /=
6809 Renamed_Entity
(E2
)));
6811 elsif Is_Overloadable
(E1
) then
6812 -- Verify that the actual subprograms match. Note that actuals
6813 -- that are attributes are rewritten as subprograms. If the
6814 -- subprogram in the formal package is defaulted, no check is
6815 -- needed. Note that this can only happen in Ada 2005 when the
6816 -- formal package can be partially parameterized.
6818 if Nkind
(Unit_Declaration_Node
(E1
)) =
6819 N_Subprogram_Renaming_Declaration
6820 and then From_Default
(Unit_Declaration_Node
(E1
))
6824 -- If the formal package has an "others" box association that
6825 -- covers this formal, there is no need for a check either.
6827 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
6828 N_Formal_Subprogram_Declaration
6829 and then Box_Present
(Unit_Declaration_Node
(E2
))
6833 -- No check needed if subprogram is a defaulted null procedure
6835 elsif No
(Alias
(E2
))
6836 and then Ekind
(E2
) = E_Procedure
6838 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
6842 -- Otherwise the actual in the formal and the actual in the
6843 -- instantiation of the formal must match, up to renamings.
6847 (Ekind
(E2
) /= Ekind
(E1
)
6848 or else not Same_Instantiated_Function
(E1
, E2
));
6852 raise Program_Error
;
6860 end Check_Formal_Package_Instance
;
6862 ---------------------------
6863 -- Check_Formal_Packages --
6864 ---------------------------
6866 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
6868 Formal_P
: Entity_Id
;
6869 Formal_Decl
: Node_Id
;
6872 -- Iterate through the declarations in the instance, looking for package
6873 -- renaming declarations that denote instances of formal packages, until
6874 -- we find the renaming of the current package itself. The declaration
6875 -- of a formal package that requires conformance checking is followed by
6876 -- an internal entity that is the abbreviated instance.
6878 E
:= First_Entity
(P_Id
);
6879 while Present
(E
) loop
6880 if Ekind
(E
) = E_Package
then
6881 exit when Renamed_Entity
(E
) = P_Id
;
6883 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
then
6884 Formal_Decl
:= Parent
(Associated_Formal_Package
(E
));
6886 if Requires_Conformance_Checking
(Formal_Decl
) then
6887 Formal_P
:= Next_Entity
(E
);
6889 -- If the instance is within an enclosing instance body
6890 -- there is no need to verify the legality of current formal
6891 -- packages because they were legal in the generic body.
6892 -- This optimization may be applicable elsewhere, and it
6893 -- also removes spurious errors that may arise with
6894 -- on-the-fly inlining and confusion between private and
6897 if not In_Instance_Body
then
6898 Check_Formal_Package_Instance
(Formal_P
, E
);
6901 -- Restore the visibility of formals of the formal instance
6902 -- that are not defaulted, and are hidden within the current
6903 -- generic. These formals may be visible within an enclosing
6909 Elmt
:= First_Elmt
(Hidden_In_Formal_Instance
(Formal_P
));
6910 while Present
(Elmt
) loop
6911 Set_Is_Hidden
(Node
(Elmt
), False);
6916 -- After checking, remove the internal validating package.
6917 -- It is only needed for semantic checks, and as it may
6918 -- contain generic formal declarations it should not reach
6921 Remove
(Unit_Declaration_Node
(Formal_P
));
6928 end Check_Formal_Packages
;
6930 ---------------------------------
6931 -- Check_Forward_Instantiation --
6932 ---------------------------------
6934 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
6936 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
6939 -- The instantiation appears before the generic body if we are in the
6940 -- scope of the unit containing the generic, either in its spec or in
6941 -- the package body, and before the generic body.
6943 if Ekind
(Gen_Comp
) = E_Package_Body
then
6944 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
6947 if In_Open_Scopes
(Gen_Comp
)
6948 and then No
(Corresponding_Body
(Decl
))
6953 and then not Is_Compilation_Unit
(S
)
6954 and then not Is_Child_Unit
(S
)
6956 if Ekind
(S
) = E_Package
then
6957 Set_Has_Forward_Instantiation
(S
);
6963 end Check_Forward_Instantiation
;
6965 ---------------------------
6966 -- Check_Generic_Actuals --
6967 ---------------------------
6969 -- The visibility of the actuals may be different between the point of
6970 -- generic instantiation and the instantiation of the body.
6972 procedure Check_Generic_Actuals
6973 (Instance
: Entity_Id
;
6974 Is_Formal_Box
: Boolean)
6976 Gen_Id
: constant Entity_Id
6977 := (if Is_Generic_Unit
(Instance
) then
6979 elsif Is_Wrapper_Package
(Instance
) then
6982 (Unit_Declaration_Node
(Related_Instance
(Instance
))))
6984 Generic_Parent
(Package_Specification
(Instance
)));
6987 Parent_Scope
: constant Entity_Id
:= Scope
(Gen_Id
);
6988 -- The enclosing scope of the generic unit
6990 procedure Check_Actual_Type
(Typ
: Entity_Id
);
6991 -- If the type of the actual is a private type declared in the enclosing
6992 -- scope of the generic, either directly or through packages nested in
6993 -- bodies, but not a derived type of a private type declared elsewhere,
6994 -- then the body of the generic sees the full view of the type because
6995 -- it has to appear in the package body. If the type is private now then
6996 -- exchange views to restore the proper visibility in the instance.
6998 -----------------------
6999 -- Check_Actual_Type --
7000 -----------------------
7002 procedure Check_Actual_Type
(Typ
: Entity_Id
) is
7003 Btyp
: constant Entity_Id
:= Base_Type
(Typ
);
7005 function Scope_Within_Body_Or_Same
7007 Outer
: Entity_Id
) return Boolean;
7008 -- Determine whether scope Inner is within the body of scope Outer
7009 -- or is Outer itself.
7011 -------------------------------
7012 -- Scope_Within_Body_Or_Same --
7013 -------------------------------
7015 function Scope_Within_Body_Or_Same
7017 Outer
: Entity_Id
) return Boolean
7019 Curr
: Entity_Id
:= Inner
;
7022 while Curr
/= Standard_Standard
loop
7023 if Curr
= Outer
then
7026 elsif Is_Package_Body_Entity
(Curr
) then
7027 Curr
:= Scope
(Curr
);
7035 end Scope_Within_Body_Or_Same
;
7038 -- The exchange is only needed if the generic is defined
7039 -- within a package which is not a common ancestor of the
7040 -- scope of the instance, and is not already in scope.
7042 if Is_Private_Type
(Btyp
)
7043 and then not Has_Private_Ancestor
(Btyp
)
7044 and then Ekind
(Parent_Scope
) in E_Package | E_Generic_Package
7045 and then Scope_Within_Body_Or_Same
(Parent_Scope
, Scope
(Btyp
))
7046 and then Parent_Scope
/= Scope
(Instance
)
7047 and then not Is_Child_Unit
(Gen_Id
)
7051 -- If the type of the entity is a subtype, it may also have
7052 -- to be made visible, together with the base type of its
7053 -- full view, after exchange.
7055 if Is_Private_Type
(Typ
) then
7057 Switch_View
(Base_Type
(Typ
));
7060 end Check_Actual_Type
;
7068 -- Start of processing for Check_Generic_Actuals
7071 E
:= First_Entity
(Instance
);
7072 while Present
(E
) loop
7074 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
7075 and then Scope
(Etype
(E
)) /= Instance
7076 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
7079 Indic
: constant Node_Id
:= Subtype_Indication
(Parent
(E
));
7082 -- Restore the proper view of the actual from the information
7083 -- saved earlier by Instantiate_Type.
7085 Check_Private_View
(Indic
);
7087 -- If this view is an array type, check its component type.
7088 -- This handles the case of an array type whose component
7089 -- type is private, used as the actual in an instantiation
7090 -- of a generic construct declared in the same package as
7091 -- the component type and taking an array type with this
7092 -- component type as formal type parameter.
7094 if Is_Array_Type
(Etype
(Indic
)) then
7096 (Component_Type_For_Private_View
(Etype
(Indic
)));
7100 -- If the actual is itself the formal of a parent instance,
7101 -- then also restore the proper view of its actual and so on.
7102 -- That's necessary for nested instantiations of the form
7105 -- type Component is private;
7106 -- type Array_Type is array (Positive range <>) of Component;
7109 -- when the outermost actuals have inconsistent views, because
7110 -- the Component_Type of Array_Type of the inner instantiations
7111 -- is the actual of Component of the outermost one and not that
7112 -- of the corresponding inner instantiations.
7114 Astype
:= Ancestor_Subtype
(E
);
7115 while Present
(Astype
)
7116 and then Nkind
(Parent
(Astype
)) = N_Subtype_Declaration
7117 and then Present
(Generic_Parent_Type
(Parent
(Astype
)))
7118 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Astype
)))
7120 Check_Private_View
(Subtype_Indication
(Parent
(Astype
)));
7121 Astype
:= Ancestor_Subtype
(Astype
);
7124 Set_Is_Generic_Actual_Type
(E
);
7126 if Is_Private_Type
(E
) and then Present
(Full_View
(E
)) then
7127 Set_Is_Generic_Actual_Type
(Full_View
(E
));
7130 Set_Is_Hidden
(E
, False);
7131 Set_Is_Potentially_Use_Visible
(E
, In_Use
(Instance
));
7133 -- We constructed the generic actual type as a subtype of the
7134 -- supplied type. This means that it normally would not inherit
7135 -- subtype specific attributes of the actual, which is wrong for
7136 -- the generic case.
7138 Astype
:= Ancestor_Subtype
(E
);
7142 -- This can happen when E is an itype that is the full view of
7143 -- a private type completed, e.g. with a constrained array. In
7144 -- that case, use the first subtype, which will carry size
7145 -- information. The base type itself is unconstrained and will
7148 Astype
:= First_Subtype
(E
);
7151 Set_Size_Info
(E
, Astype
);
7152 Copy_RM_Size
(To
=> E
, From
=> Astype
);
7153 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
7155 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
7156 Set_RM_Size
(E
, RM_Size
(Astype
));
7159 elsif Ekind
(E
) = E_Package
then
7161 -- If this is the renaming for the current instance, we're done.
7162 -- Otherwise it is a formal package. If the corresponding formal
7163 -- was declared with a box, the (instantiations of the) generic
7164 -- formal part are also visible. Otherwise, ignore the entity
7165 -- created to validate the actuals.
7167 if Renamed_Entity
(E
) = Instance
then
7170 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
7173 -- The visibility of a formal of an enclosing generic is already
7176 elsif Denotes_Formal_Package
(E
) then
7179 elsif Present
(Associated_Formal_Package
(E
))
7180 and then not Is_Generic_Formal
(E
)
7182 Check_Generic_Actuals
7183 (Renamed_Entity
(E
),
7185 Box_Present
(Parent
(Associated_Formal_Package
(E
))));
7187 Set_Is_Hidden
(E
, False);
7190 -- If this is a subprogram instance (in a wrapper package) the
7191 -- actual is fully visible.
7193 elsif Is_Wrapper_Package
(Instance
) then
7194 Set_Is_Hidden
(E
, False);
7196 -- If the formal package is declared with a box, or if the formal
7197 -- parameter is defaulted, it is visible in the body.
7199 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
7200 Set_Is_Hidden
(E
, False);
7203 -- Check directly the type of the actual objects, including the
7204 -- component type for array types.
7206 if Ekind
(E
) in E_Constant | E_Variable
then
7207 Check_Actual_Type
(Etype
(E
));
7209 if Is_Array_Type
(Etype
(E
)) then
7210 Check_Actual_Type
(Component_Type
(Etype
(E
)));
7213 -- As well as the type of formal parameters of actual subprograms
7215 elsif Ekind
(E
) in E_Function | E_Procedure
7216 and then Is_Generic_Actual_Subprogram
(E
)
7217 and then Present
(Alias
(E
))
7219 Formal
:= First_Formal
(Alias
(E
));
7220 while Present
(Formal
) loop
7221 Check_Actual_Type
(Etype
(Formal
));
7222 Next_Formal
(Formal
);
7228 end Check_Generic_Actuals
;
7230 ------------------------------
7231 -- Check_Generic_Child_Unit --
7232 ------------------------------
7234 procedure Check_Generic_Child_Unit
7236 Parent_Installed
: in out Boolean)
7238 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
7239 Gen_Par
: Entity_Id
:= Empty
;
7241 Inst_Par
: Entity_Id
:= Empty
;
7244 function Find_Generic_Child
7246 Id
: Node_Id
) return Entity_Id
;
7247 -- Search generic parent for possible child unit with the given name
7249 function In_Enclosing_Instance
return Boolean;
7250 -- Within an instance of the parent, the child unit may be denoted by
7251 -- a simple name, or an abbreviated expanded name. Examine enclosing
7252 -- scopes to locate a possible parent instantiation.
7254 ------------------------
7255 -- Find_Generic_Child --
7256 ------------------------
7258 function Find_Generic_Child
7260 Id
: Node_Id
) return Entity_Id
7265 -- If entity of name is already set, instance has already been
7266 -- resolved, e.g. in an enclosing instantiation.
7268 if Present
(Entity
(Id
)) then
7269 if Scope
(Entity
(Id
)) = Scop
then
7276 E
:= First_Entity
(Scop
);
7277 while Present
(E
) loop
7278 if Chars
(E
) = Chars
(Id
)
7279 and then Is_Child_Unit
(E
)
7281 if Is_Child_Unit
(E
)
7282 and then not Is_Visible_Lib_Unit
(E
)
7285 ("generic child unit& is not visible", Gen_Id
, E
);
7297 end Find_Generic_Child
;
7299 ---------------------------
7300 -- In_Enclosing_Instance --
7301 ---------------------------
7303 function In_Enclosing_Instance
return Boolean is
7304 Enclosing_Instance
: Node_Id
;
7305 Instance_Decl
: Node_Id
;
7308 -- We do not inline any call that contains instantiations, except
7309 -- for instantiations of Unchecked_Conversion, so if we are within
7310 -- an inlined body the current instance does not require parents.
7312 if In_Inlined_Body
then
7313 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
7317 -- Loop to check enclosing scopes
7319 Enclosing_Instance
:= Current_Scope
;
7320 while Present
(Enclosing_Instance
) loop
7321 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
7323 if Ekind
(Enclosing_Instance
) = E_Package
7324 and then Is_Generic_Instance
(Enclosing_Instance
)
7326 (Generic_Parent
(Specification
(Instance_Decl
)))
7328 -- Check whether the generic we are looking for is a child of
7331 E
:= Find_Generic_Child
7332 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
7333 exit when Present
(E
);
7339 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
7351 Make_Expanded_Name
(Loc
,
7353 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
7354 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
7356 Set_Entity
(Gen_Id
, E
);
7357 Set_Etype
(Gen_Id
, Etype
(E
));
7358 Parent_Installed
:= False; -- Already in scope.
7361 end In_Enclosing_Instance
;
7363 -- Start of processing for Check_Generic_Child_Unit
7366 -- If the name of the generic is given by a selected component, it may
7367 -- be the name of a generic child unit, and the prefix is the name of an
7368 -- instance of the parent, in which case the child unit must be visible.
7369 -- If this instance is not in scope, it must be placed there and removed
7370 -- after instantiation, because what is being instantiated is not the
7371 -- original child, but the corresponding child present in the instance
7374 -- If the child is instantiated within the parent, it can be given by
7375 -- a simple name. In this case the instance is already in scope, but
7376 -- the child generic must be recovered from the generic parent as well.
7378 if Nkind
(Gen_Id
) = N_Selected_Component
then
7379 S
:= Selector_Name
(Gen_Id
);
7380 Analyze
(Prefix
(Gen_Id
));
7381 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7383 if Ekind
(Inst_Par
) = E_Package
7384 and then Present
(Renamed_Entity
(Inst_Par
))
7386 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7389 if Ekind
(Inst_Par
) = E_Package
then
7390 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
7391 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
7393 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
7395 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
7397 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
7400 elsif Ekind
(Inst_Par
) = E_Generic_Package
7401 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
7403 -- A formal package may be a real child package, and not the
7404 -- implicit instance within a parent. In this case the child is
7405 -- not visible and has to be retrieved explicitly as well.
7407 Gen_Par
:= Inst_Par
;
7410 if Present
(Gen_Par
) then
7412 -- The prefix denotes an instantiation. The entity itself may be a
7413 -- nested generic, or a child unit.
7415 E
:= Find_Generic_Child
(Gen_Par
, S
);
7418 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
7419 Set_Entity
(Gen_Id
, E
);
7420 Set_Etype
(Gen_Id
, Etype
(E
));
7422 Set_Etype
(S
, Etype
(E
));
7424 -- Indicate that this is a reference to the parent
7426 if In_Extended_Main_Source_Unit
(Gen_Id
) then
7427 Set_Is_Instantiated
(Inst_Par
);
7430 -- A common mistake is to replicate the naming scheme of a
7431 -- hierarchy by instantiating a generic child directly, rather
7432 -- than the implicit child in a parent instance:
7434 -- generic .. package Gpar is ..
7435 -- generic .. package Gpar.Child is ..
7436 -- package Par is new Gpar ();
7439 -- package Par.Child is new Gpar.Child ();
7440 -- rather than Par.Child
7442 -- In this case the instantiation is within Par, which is an
7443 -- instance, but Gpar does not denote Par because we are not IN
7444 -- the instance of Gpar, so this is illegal. The test below
7445 -- recognizes this particular case.
7448 -- We want to reject the final instantiation in
7449 -- generic package G1 is end G1;
7450 -- generic package G1.G2 is end G1.G2;
7451 -- with G1; package I1 is new G1;
7452 -- with G1.G2; package I1.I2 is new G1.G2;
7453 -- because the use of G1.G2 should instead be either
7454 -- I1.G2 or simply G2. However, the tree that is built
7455 -- in this case is wrong. In the expanded copy
7456 -- of G2, we need (and therefore generate) a renaming
7457 -- package G1 renames I1;
7458 -- but this renaming should not participate in resolving
7459 -- this occurrence of the name "G1.G2"; unfortunately,
7460 -- it does. Rather than correct this error, we compensate
7461 -- for it in this function.
7463 -- We also perform another adjustment here. If we are
7464 -- currently inside a generic package, then that
7465 -- generic package needs to be treated as a package.
7466 -- For example, if a generic Aaa declares a nested generic
7467 -- Bbb (perhaps as a child unit) then Aaa can also legally
7468 -- declare an instance of Aaa.Bbb.
7470 function Adjusted_Inst_Par_Ekind
return Entity_Kind
;
7472 -----------------------------
7473 -- Adjusted_Inst_Par_Ekind --
7474 -----------------------------
7476 function Adjusted_Inst_Par_Ekind
return Entity_Kind
is
7477 Prefix_Entity
: Entity_Id
;
7478 Inst_Par_GP
: Node_Id
;
7479 Inst_Par_Parent
: Node_Id
:= Parent
(Inst_Par
);
7481 if Nkind
(Inst_Par_Parent
) = N_Defining_Program_Unit_Name
7483 Inst_Par_Parent
:= Parent
(Inst_Par_Parent
);
7486 Inst_Par_GP
:= Generic_Parent
(Inst_Par_Parent
);
7488 if Nkind
(Gen_Id
) = N_Expanded_Name
7489 and then Present
(Inst_Par_GP
)
7490 and then Ekind
(Inst_Par_GP
) = E_Generic_Package
7492 Prefix_Entity
:= Entity
(Prefix
(Gen_Id
));
7494 if Present
(Prefix_Entity
)
7495 and then not Comes_From_Source
(Prefix_Entity
)
7496 and then Nkind
(Parent
(Prefix_Entity
)) =
7497 N_Package_Renaming_Declaration
7498 and then Chars
(Prefix_Entity
) = Chars
(Inst_Par_GP
)
7500 return E_Generic_Package
;
7504 if Ekind
(Inst_Par
) = E_Generic_Package
7505 and then In_Open_Scopes
(Inst_Par
)
7507 -- If we are inside a generic package then
7508 -- treat it as a package.
7513 return Ekind
(Inst_Par
);
7514 end Adjusted_Inst_Par_Ekind
;
7517 if Is_Child_Unit
(E
)
7518 and then (No
(Inst_Par
)
7519 or else Adjusted_Inst_Par_Ekind
=
7521 and then (not In_Instance
7522 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
7526 ("prefix of generic child unit must be " &
7527 "instance of parent",
7532 if not In_Open_Scopes
(Inst_Par
)
7533 and then Nkind
(Parent
(Gen_Id
)) not in
7534 N_Generic_Renaming_Declaration
7536 Install_Parent
(Inst_Par
);
7537 Parent_Installed
:= True;
7539 elsif In_Open_Scopes
(Inst_Par
) then
7541 -- If the parent is already installed, install the actuals
7542 -- for its formal packages. This is necessary when the child
7543 -- instance is a child of the parent instance: in this case,
7544 -- the parent is placed on the scope stack but the formal
7545 -- packages are not made visible.
7547 Install_Formal_Packages
(Inst_Par
);
7551 -- If the generic parent does not contain an entity that
7552 -- corresponds to the selector, the instance doesn't either.
7553 -- Analyzing the node will yield the appropriate error message.
7554 -- If the entity is not a child unit, then it is an inner
7555 -- generic in the parent.
7563 if Is_Child_Unit
(Entity
(Gen_Id
))
7565 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7566 and then not In_Open_Scopes
(Inst_Par
)
7568 Install_Parent
(Inst_Par
);
7569 Parent_Installed
:= True;
7571 -- The generic unit may be the renaming of the implicit child
7572 -- present in an instance. In that case the parent instance is
7573 -- obtained from the name of the renamed entity.
7575 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
7576 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7577 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7580 Renamed_Package
: constant Node_Id
:=
7581 Name
(Parent
(Entity
(Gen_Id
)));
7583 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
7584 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
7585 Install_Parent
(Inst_Par
);
7586 Parent_Installed
:= True;
7592 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
7594 -- Entity already present, analyze prefix, whose meaning may be an
7595 -- instance in the current context. If it is an instance of a
7596 -- relative within another, the proper parent may still have to be
7597 -- installed, if they are not of the same generation.
7599 Analyze
(Prefix
(Gen_Id
));
7601 -- Prevent cascaded errors
7603 if Etype
(Prefix
(Gen_Id
)) = Any_Type
then
7607 -- In the unlikely case that a local declaration hides the name of
7608 -- the parent package, locate it on the homonym chain. If the context
7609 -- is an instance of the parent, the renaming entity is flagged as
7612 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7613 while Present
(Inst_Par
)
7614 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
7616 Inst_Par
:= Homonym
(Inst_Par
);
7619 pragma Assert
(Present
(Inst_Par
));
7620 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
7622 if In_Enclosing_Instance
then
7625 elsif Present
(Entity
(Gen_Id
))
7626 and then No
(Renamed_Entity
(Entity
(Gen_Id
)))
7627 and then Is_Child_Unit
(Entity
(Gen_Id
))
7628 and then not In_Open_Scopes
(Inst_Par
)
7630 Install_Parent
(Inst_Par
);
7631 Parent_Installed
:= True;
7633 -- Handle renaming of generic child unit
7635 elsif Present
(Entity
(Gen_Id
))
7636 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7637 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7644 -- The entity of the renamed generic child unit does not
7645 -- have any reference to the instantiated parent. In order to
7646 -- locate it we traverse the scope containing the renaming
7647 -- declaration; the instance of the parent is available in
7648 -- the prefix of the renaming declaration. For example:
7651 -- package Inst_Par is new ...
7652 -- generic package Ren_Child renames Ins_Par.Child;
7657 -- package Inst_Child is new A.Ren_Child;
7660 E
:= First_Entity
(Entity
(Prefix
(Gen_Id
)));
7661 while Present
(E
) loop
7662 if not Is_Object
(E
)
7663 and then Present
(Renamed_Entity
(E
))
7665 Renamed_Entity
(E
) = Renamed_Entity
(Entity
(Gen_Id
))
7667 Ren_Decl
:= Parent
(E
);
7668 Inst_Par
:= Entity
(Prefix
(Name
(Ren_Decl
)));
7670 if not In_Open_Scopes
(Inst_Par
) then
7671 Install_Parent
(Inst_Par
);
7672 Parent_Installed
:= True;
7678 E
:= Next_Entity
(E
);
7683 elsif In_Enclosing_Instance
then
7685 -- The child unit is found in some enclosing scope
7692 -- If this is the renaming of the implicit child in a parent
7693 -- instance, recover the parent name and install it.
7695 if Is_Entity_Name
(Gen_Id
) then
7696 E
:= Entity
(Gen_Id
);
7698 if Is_Generic_Unit
(E
)
7699 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
7700 and then Is_Child_Unit
(Renamed_Entity
(E
))
7701 and then Is_Generic_Unit
(Scope
(Renamed_Entity
(E
)))
7702 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
7704 Rewrite
(Gen_Id
, New_Copy_Tree
(Name
(Parent
(E
))));
7705 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7707 if not In_Open_Scopes
(Inst_Par
) then
7708 Install_Parent
(Inst_Par
);
7709 Parent_Installed
:= True;
7712 -- If it is a child unit of a non-generic parent, it may be
7713 -- use-visible and given by a direct name. Install parent as
7716 elsif Is_Generic_Unit
(E
)
7717 and then Is_Child_Unit
(E
)
7719 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7720 and then not Is_Generic_Unit
(Scope
(E
))
7722 if not In_Open_Scopes
(Scope
(E
)) then
7723 Install_Parent
(Scope
(E
));
7724 Parent_Installed
:= True;
7729 end Check_Generic_Child_Unit
;
7731 -----------------------------
7732 -- Check_Hidden_Child_Unit --
7733 -----------------------------
7735 procedure Check_Hidden_Child_Unit
7737 Gen_Unit
: Entity_Id
;
7738 Act_Decl_Id
: Entity_Id
)
7740 Gen_Id
: constant Node_Id
:= Name
(N
);
7743 if Is_Child_Unit
(Gen_Unit
)
7744 and then Is_Child_Unit
(Act_Decl_Id
)
7745 and then Nkind
(Gen_Id
) = N_Expanded_Name
7746 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
7747 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
7749 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
7751 ("generic unit & is implicitly declared in &",
7752 Defining_Unit_Name
(N
), Gen_Unit
);
7753 Error_Msg_N
("\instance must have different name",
7754 Defining_Unit_Name
(N
));
7756 end Check_Hidden_Child_Unit
;
7758 ------------------------
7759 -- Check_Private_View --
7760 ------------------------
7762 procedure Check_Private_View
(N
: Node_Id
) is
7763 Comparison
: constant Boolean := Nkind
(N
) in N_Op_Compare
;
7764 Typ
: constant Entity_Id
:=
7765 (if Comparison
then Compare_Type
(N
) else Etype
(N
));
7767 procedure Check_Private_Type
(T
: Entity_Id
; Private_View
: Boolean);
7768 -- Check that the available view of T matches Private_View and, if not,
7769 -- switch the view of T or of its base type.
7771 procedure Check_Private_Type
(T
: Entity_Id
; Private_View
: Boolean) is
7772 BT
: constant Entity_Id
:= Base_Type
(T
);
7775 -- If the full declaration was not visible in the generic, stop here
7777 if Private_View
then
7781 -- Exchange views if the type was not private in the generic but is
7782 -- private at the point of instantiation. Do not exchange views if
7783 -- the scope of the type is in scope. This can happen if both generic
7784 -- and instance are sibling units, or if type is defined in a parent.
7785 -- In this case the visibility of the type will be correct for all
7788 if Is_Private_Type
(T
)
7789 and then Present
(Full_View
(T
))
7790 and then not In_Open_Scopes
(Scope
(T
))
7794 -- Finally, a nonprivate subtype may have a private base type, which
7795 -- must be exchanged for consistency. This can happen when a package
7796 -- body is instantiated, when the scope stack is empty but in fact
7797 -- the subtype and the base type are declared in an enclosing scope.
7799 -- Note that in this case we introduce an inconsistency in the view
7800 -- set, because we switch the base type BT, but there could be some
7801 -- private dependent subtypes of BT which remain unswitched. Such
7802 -- subtypes might need to be switched at a later point (see specific
7803 -- provision for that case in Switch_View).
7805 elsif not Is_Private_Type
(T
)
7806 and then Is_Private_Type
(BT
)
7807 and then Present
(Full_View
(BT
))
7808 and then not In_Open_Scopes
(BT
)
7810 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
7811 Exchange_Declarations
(BT
);
7813 end Check_Private_Type
;
7816 if Present
(Typ
) then
7817 -- If the type appears in a subtype declaration, the subtype in
7818 -- instance must have a view compatible with that of its parent,
7819 -- which must be exchanged (see corresponding code in Restore_
7820 -- Private_Views) so we make an exception to the open scope rule
7821 -- implemented by Check_Private_Type above.
7823 if Has_Private_View
(N
)
7824 and then not Is_Private_Type
(Typ
)
7825 and then not Has_Been_Exchanged
(Typ
)
7826 and then (not In_Open_Scopes
(Scope
(Typ
))
7827 or else Nkind
(Parent
(N
)) = N_Subtype_Declaration
)
7830 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
7833 -- In the generic, only the private declaration was visible
7835 Prepend_Elmt
(Typ
, Exchanged_Views
);
7836 Exchange_Declarations
7837 (if Comparison
then Compare_Type
(Assoc
) else Etype
(Assoc
));
7840 -- Check that the available views of Typ match their respective flag.
7841 -- Note that the type of a visible discriminant is never private.
7844 Check_Private_Type
(Typ
, Has_Private_View
(N
));
7846 if Is_Access_Type
(Typ
) then
7848 (Designated_Type
(Typ
), Has_Secondary_Private_View
(N
));
7850 elsif Is_Array_Type
(Typ
) then
7852 (Component_Type_For_Private_View
(Typ
),
7853 Has_Secondary_Private_View
(N
));
7855 elsif (Is_Record_Type
(Typ
) or else Is_Concurrent_Type
(Typ
))
7856 and then Has_Discriminants
(Typ
)
7862 Disc
:= First_Discriminant
(Typ
);
7863 while Present
(Disc
) loop
7864 Check_Private_Type
(Etype
(Disc
), False);
7865 Next_Discriminant
(Disc
);
7871 end Check_Private_View
;
7873 -----------------------------
7874 -- Check_Hidden_Primitives --
7875 -----------------------------
7877 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
7880 Result
: Elist_Id
:= No_Elist
;
7883 if No
(Assoc_List
) then
7887 -- Traverse the list of associations between formals and actuals
7888 -- searching for renamings of tagged types
7890 Actual
:= First
(Assoc_List
);
7891 while Present
(Actual
) loop
7892 if Nkind
(Actual
) = N_Subtype_Declaration
then
7893 Gen_T
:= Generic_Parent_Type
(Actual
);
7895 if Present
(Gen_T
) and then Is_Tagged_Type
(Gen_T
) then
7897 -- Traverse the list of primitives of the actual types
7898 -- searching for hidden primitives that are visible in the
7899 -- corresponding generic formal; leave them visible and
7900 -- append them to Result to restore their decoration later.
7902 Install_Hidden_Primitives
7903 (Prims_List
=> Result
,
7905 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
7913 end Check_Hidden_Primitives
;
7915 -------------------------------------
7916 -- Component_Type_For_Private_View --
7917 -------------------------------------
7919 function Component_Type_For_Private_View
(T
: Entity_Id
) return Entity_Id
is
7920 Typ
: constant Entity_Id
:= Component_Type
(T
);
7923 if Is_Array_Type
(Typ
) and then not Has_Private_Declaration
(Typ
) then
7924 return Component_Type_For_Private_View
(Typ
);
7928 end Component_Type_For_Private_View
;
7930 --------------------------
7931 -- Contains_Instance_Of --
7932 --------------------------
7934 function Contains_Instance_Of
7937 N
: Node_Id
) return Boolean
7945 -- Verify that there are no circular instantiations. We check whether
7946 -- the unit contains an instance of the current scope or some enclosing
7947 -- scope (in case one of the instances appears in a subunit). Longer
7948 -- circularities involving subunits might seem too pathological to
7949 -- consider, but they were not too pathological for the authors of
7950 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7951 -- enclosing generic scopes as containing an instance.
7954 -- Within a generic subprogram body, the scope is not generic, to
7955 -- allow for recursive subprograms. Use the declaration to determine
7956 -- whether this is a generic unit.
7958 if Ekind
(Scop
) = E_Generic_Package
7959 or else (Is_Subprogram
(Scop
)
7960 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
7961 N_Generic_Subprogram_Declaration
)
7963 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
7965 while Present
(Elmt
) loop
7966 if Node
(Elmt
) = Scop
then
7967 Error_Msg_Node_2
:= Inner
;
7969 ("circular instantiation: & instantiated within &!",
7973 elsif Node
(Elmt
) = Inner
then
7976 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
7977 Error_Msg_Node_2
:= Inner
;
7979 ("circular instantiation: & instantiated within &!",
7987 -- Indicate that Inner is being instantiated within Scop
7989 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
7992 if Scop
= Standard_Standard
then
7995 Scop
:= Scope
(Scop
);
8000 end Contains_Instance_Of
;
8002 -----------------------
8003 -- Copy_Generic_Node --
8004 -----------------------
8006 function Copy_Generic_Node
8008 Parent_Id
: Node_Id
;
8009 Instantiating
: Boolean) return Node_Id
8014 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
8015 -- Check the given value of one of the Fields referenced by the current
8016 -- node to determine whether to copy it recursively. The field may hold
8017 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
8018 -- Char) in which case it need not be copied.
8020 procedure Copy_Descendants
;
8021 -- Common utility for various nodes
8023 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
8024 -- Make copy of element list
8026 function Copy_Generic_List
8028 Parent_Id
: Node_Id
) return List_Id
;
8029 -- Apply Copy_Generic_Node recursively to the members of a node list
8031 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
8032 -- True if an identifier is part of the defining program unit name of
8034 -- Consider removing this subprogram now that ASIS no longer uses it.
8036 ----------------------
8037 -- Copy_Descendants --
8038 ----------------------
8040 procedure Copy_Descendants
is
8041 procedure Walk
is new
8042 Walk_Sinfo_Fields_Pairwise
(Copy_Generic_Descendant
);
8045 end Copy_Descendants
;
8047 -----------------------------
8048 -- Copy_Generic_Descendant --
8049 -----------------------------
8051 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
8053 if D
= Union_Id
(Empty
) then
8056 elsif D
in Node_Range
then
8058 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
8060 elsif D
in List_Range
then
8061 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
8063 elsif D
in Elist_Range
then
8064 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
8066 -- Nothing else is copyable (e.g. Uint values), return as is
8071 end Copy_Generic_Descendant
;
8073 ------------------------
8074 -- Copy_Generic_Elist --
8075 ------------------------
8077 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
8084 M
:= First_Elmt
(E
);
8085 while Present
(M
) loop
8087 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
8096 end Copy_Generic_Elist
;
8098 -----------------------
8099 -- Copy_Generic_List --
8100 -----------------------
8102 function Copy_Generic_List
8104 Parent_Id
: Node_Id
) return List_Id
8112 Set_Parent
(New_L
, Parent_Id
);
8115 while Present
(N
) loop
8116 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
8125 end Copy_Generic_List
;
8127 ---------------------------
8128 -- In_Defining_Unit_Name --
8129 ---------------------------
8131 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
8134 Present
(Parent
(Nam
))
8135 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
8137 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
8138 and then In_Defining_Unit_Name
(Parent
(Nam
))));
8139 end In_Defining_Unit_Name
;
8141 -- Start of processing for Copy_Generic_Node
8148 New_N
:= New_Copy
(N
);
8150 -- If we are instantiating, we want to adjust the sloc based on the
8151 -- current S_Adjustment. However, if this is the root node of a subunit,
8152 -- we need to defer that adjustment to below (see "elsif Instantiating
8153 -- and Was_Stub"), so it comes after Create_Instantiation_Source has
8154 -- computed the adjustment.
8157 and then not (Nkind
(N
) in N_Proper_Body
8158 and then Was_Originally_Stub
(N
))
8160 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8163 if not Is_List_Member
(N
) then
8164 Set_Parent
(New_N
, Parent_Id
);
8167 -- Special casing for identifiers and other entity names and operators
8169 if Nkind
(N
) in N_Character_Literal
8175 if not Instantiating
then
8177 -- Link both nodes in order to assign subsequently the entity of
8178 -- the copy to the original node, in case this is a global
8181 Set_Associated_Node
(N
, New_N
);
8183 -- If we are within an instantiation, this is a nested generic
8184 -- that has already been analyzed at the point of definition.
8185 -- We must preserve references that were global to the enclosing
8186 -- parent at that point. Other occurrences, whether global or
8187 -- local to the current generic, must be resolved anew, so we
8188 -- reset the entity in the generic copy. A global reference has a
8189 -- smaller depth than the parent, or else the same depth in case
8190 -- both are distinct compilation units.
8192 -- A child unit is implicitly declared within the enclosing parent
8193 -- but is in fact global to it, and must be preserved.
8195 -- It is also possible for Current_Instantiated_Parent to be
8196 -- defined, and for this not to be a nested generic, namely if
8197 -- the unit is loaded through Rtsfind. In that case, the entity of
8198 -- New_N is only a link to the associated node, and not a defining
8201 -- The entities for parent units in the defining_program_unit of a
8202 -- generic child unit are established when the context of the unit
8203 -- is first analyzed, before the generic copy is made. They are
8204 -- preserved in the copy for use in e.g. ASIS queries.
8206 Ent
:= Entity
(New_N
);
8208 if No
(Current_Instantiated_Parent
.Gen_Id
) then
8210 or else Nkind
(Ent
) /= N_Defining_Identifier
8211 or else not In_Defining_Unit_Name
(N
)
8213 Set_Associated_Node
(New_N
, Empty
);
8217 or else Nkind
(Ent
) not in N_Entity
8218 or else No
(Scope
(Ent
))
8220 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
8221 and then not Is_Child_Unit
(Ent
))
8223 (Scope_Depth_Set
(Scope
(Ent
))
8225 Scope_Depth
(Scope
(Ent
)) >
8226 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
8228 Get_Source_Unit
(Ent
) =
8229 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
8231 Set_Associated_Node
(New_N
, Empty
);
8234 -- Case of instantiating identifier or some other name or operator
8237 -- If the associated node is still defined, the entity in it
8238 -- is global, and must be copied to the instance. If this copy
8239 -- is being made for a body to inline, it is applied to an
8240 -- instantiated tree, and the entity is already present and
8241 -- must be also preserved.
8244 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
8247 if Present
(Assoc
) then
8248 if Nkind
(Assoc
) = Nkind
(N
) then
8249 Set_Entity
(New_N
, Entity
(Assoc
));
8250 Check_Private_View
(N
);
8252 -- The node is a reference to a global type and acts as the
8253 -- subtype mark of a qualified expression created in order
8254 -- to aid resolution of accidental overloading in instances.
8255 -- Since N is a reference to a type, the Associated_Node of
8256 -- N denotes an entity rather than another identifier. See
8257 -- Qualify_Universal_Operands for details.
8259 elsif Nkind
(N
) = N_Identifier
8260 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
8261 and then Subtype_Mark
(Parent
(N
)) = N
8262 and then Is_Qualified_Universal_Literal
(Parent
(N
))
8264 Set_Entity
(New_N
, Assoc
);
8266 -- Cope with the rewriting into expanded name that may have
8267 -- occurred in between, e.g. in Check_Generic_Child_Unit for
8268 -- generic renaming declarations.
8270 elsif Nkind
(Assoc
) = N_Expanded_Name
then
8271 Rewrite
(N
, New_Copy_Tree
(Assoc
));
8272 Set_Associated_Node
(N
, Assoc
);
8273 return Copy_Generic_Node
(N
, Parent_Id
, Instantiating
);
8275 -- The name in the call may be a selected component if the
8276 -- call has not been analyzed yet, as may be the case for
8277 -- pre/post conditions in a generic unit.
8279 elsif Nkind
(Assoc
) = N_Function_Call
8280 and then Is_Entity_Name
(Name
(Assoc
))
8282 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
8283 Check_Private_View
(N
);
8285 elsif Nkind
(Assoc
) in N_Entity
8286 and then (Expander_Active
8287 or else (GNATprove_Mode
8288 and then not In_Spec_Expression
8289 and then not Inside_A_Generic
))
8291 -- Inlining case: we are copying a tree that contains
8292 -- global entities, which are preserved in the copy to be
8293 -- used for subsequent inlining.
8298 Set_Entity
(New_N
, Empty
);
8304 -- For expanded name, we must copy the Prefix and Selector_Name
8306 if Nkind
(N
) = N_Expanded_Name
then
8308 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
8310 Set_Selector_Name
(New_N
,
8311 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
8313 -- For operators, copy the operands
8315 elsif Nkind
(N
) in N_Op
then
8316 if Nkind
(N
) in N_Binary_Op
then
8317 Set_Left_Opnd
(New_N
,
8318 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
8321 Set_Right_Opnd
(New_N
,
8322 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
8325 -- Establish a link between an entity from the generic template and the
8326 -- corresponding entity in the generic copy to be analyzed.
8328 elsif Nkind
(N
) in N_Entity
then
8329 if not Instantiating
then
8330 Set_Associated_Entity
(N
, New_N
);
8333 -- Clear any existing link the copy may inherit from the replicated
8334 -- generic template entity.
8336 Set_Associated_Entity
(New_N
, Empty
);
8338 -- Special casing for stubs
8340 elsif Nkind
(N
) in N_Body_Stub
then
8342 -- In any case, we must copy the specification or defining
8343 -- identifier as appropriate.
8345 if Nkind
(N
) = N_Subprogram_Body_Stub
then
8346 Set_Specification
(New_N
,
8347 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
8350 Set_Defining_Identifier
(New_N
,
8352 (Defining_Identifier
(N
), New_N
, Instantiating
));
8355 -- If we are not instantiating, then this is where we load and
8356 -- analyze subunits, i.e. at the point where the stub occurs. A
8357 -- more permissive system might defer this analysis to the point
8358 -- of instantiation, but this seems too complicated for now.
8360 if not Instantiating
then
8362 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
8364 Unum
: Unit_Number_Type
;
8368 -- Make sure that, if it is a subunit of the main unit that is
8369 -- preprocessed and if -gnateG is specified, the preprocessed
8370 -- file will be written.
8372 Lib
.Analysing_Subunit_Of_Main
:=
8373 Lib
.In_Extended_Main_Source_Unit
(N
);
8376 (Load_Name
=> Subunit_Name
,
8380 Lib
.Analysing_Subunit_Of_Main
:= False;
8382 -- If the proper body is not found, a warning message will be
8383 -- emitted when analyzing the stub, or later at the point of
8384 -- instantiation. Here we just leave the stub as is.
8386 if Unum
= No_Unit
then
8387 Subunits_Missing
:= True;
8388 goto Subunit_Not_Found
;
8391 Subunit
:= Cunit
(Unum
);
8393 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
8395 ("found child unit instead of expected SEPARATE subunit",
8397 Error_Msg_Sloc
:= Sloc
(N
);
8398 Error_Msg_N
("\to complete stub #", Subunit
);
8399 goto Subunit_Not_Found
;
8402 -- We must create a generic copy of the subunit, in order to
8403 -- perform semantic analysis on it, and we must replace the
8404 -- stub in the original generic unit with the subunit, in order
8405 -- to preserve non-local references within.
8407 -- Only the proper body needs to be copied. Library_Unit and
8408 -- context clause are simply inherited by the generic copy.
8409 -- Note that the copy (which may be recursive if there are
8410 -- nested subunits) must be done first, before attaching it to
8411 -- the enclosing generic.
8415 (Proper_Body
(Unit
(Subunit
)),
8416 Empty
, Instantiating
=> False);
8418 -- Now place the original proper body in the original generic
8419 -- unit. This is a body, not a compilation unit.
8421 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
8422 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
8423 Set_Was_Originally_Stub
(N
);
8425 -- Finally replace the body of the subunit with its copy, and
8426 -- make this new subunit into the library unit of the generic
8427 -- copy, which does not have stubs any longer.
8429 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
8430 Set_Library_Unit
(New_N
, Subunit
);
8431 Inherit_Context
(Unit
(Subunit
), N
);
8434 -- If we are instantiating, this must be an error case, since
8435 -- otherwise we would have replaced the stub node by the proper body
8436 -- that corresponds. So just ignore it in the copy (i.e. we have
8437 -- copied it, and that is good enough).
8443 <<Subunit_Not_Found
>> null;
8445 -- If the node is a compilation unit, it is the subunit of a stub, which
8446 -- has been loaded already (see code below). In this case, the library
8447 -- unit field of N points to the parent unit (which is a compilation
8448 -- unit) and need not (and cannot) be copied.
8450 -- When the proper body of the stub is analyzed, the library_unit link
8451 -- is used to establish the proper context (see sem_ch10).
8453 -- The other fields of a compilation unit are copied as usual
8455 elsif Nkind
(N
) = N_Compilation_Unit
then
8457 -- This code can only be executed when not instantiating, because in
8458 -- the copy made for an instantiation, the compilation unit node has
8459 -- disappeared at the point that a stub is replaced by its proper
8462 pragma Assert
(not Instantiating
);
8464 Set_Context_Items
(New_N
,
8465 Copy_Generic_List
(Context_Items
(N
), New_N
));
8468 Copy_Generic_Node
(Unit
(N
), New_N
, Instantiating
=> False));
8470 Set_First_Inlined_Subprogram
(New_N
,
8472 (First_Inlined_Subprogram
(N
), New_N
, Instantiating
=> False));
8477 (Aux_Decls_Node
(N
), New_N
, Instantiating
=> False));
8479 -- For an assignment node, the assignment is known to be semantically
8480 -- legal if we are instantiating the template. This avoids incorrect
8481 -- diagnostics in generated code.
8483 elsif Nkind
(N
) = N_Assignment_Statement
then
8485 -- Copy name and expression fields in usual manner
8488 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
8490 Set_Expression
(New_N
,
8491 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
8493 if Instantiating
then
8494 Set_Assignment_OK
(Name
(New_N
), True);
8497 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
8498 if not Instantiating
then
8499 Set_Associated_Node
(N
, New_N
);
8502 -- If, in the generic, the aggregate has a global composite type
8503 -- and, at the point of instantiation, the type has a private view
8504 -- then install the full view.
8507 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
8511 and then Nkind
(Assoc
) = Nkind
(N
)
8512 and then Present
(Etype
(Assoc
))
8513 and then Is_Private_Type
(Etype
(Assoc
))
8515 Switch_View
(Etype
(Assoc
));
8519 -- Moreover, for a full aggregate, if the type is a derived tagged
8520 -- type and has a global ancestor, then also restore the full view
8521 -- of this ancestor and do so up to the root type. Beware that the
8522 -- Ancestor_Type field is overloaded, so test that it's an entity.
8524 if Nkind
(N
) = N_Aggregate
8525 and then Present
(Ancestor_Type
(N
))
8526 and then Nkind
(Ancestor_Type
(N
)) in N_Entity
8529 Root_Typ
: constant Entity_Id
:=
8530 Root_Type
(Ancestor_Type
(N
));
8532 Typ
: Entity_Id
:= Ancestor_Type
(N
);
8536 if Is_Private_Type
(Typ
) then
8540 exit when Typ
= Root_Typ
;
8548 -- Do not copy the associated node, which points to the generic copy
8549 -- of the aggregate.
8551 if Nkind
(N
) = N_Aggregate
then
8552 Set_Aggregate_Bounds
8554 Node_Id
(Copy_Generic_Descendant
8555 (Union_Id
(Aggregate_Bounds
(N
)))));
8557 elsif Nkind
(N
) = N_Extension_Aggregate
then
8560 Node_Id
(Copy_Generic_Descendant
8561 (Union_Id
(Ancestor_Part
(N
)))));
8564 pragma Assert
(False);
8569 List_Id
(Copy_Generic_Descendant
(Union_Id
(Expressions
(N
)))));
8570 Set_Component_Associations
8572 List_Id
(Copy_Generic_Descendant
8573 (Union_Id
(Component_Associations
(N
)))));
8575 (New_N
, Node_Id
(Copy_Generic_Descendant
(Union_Id
(Etype
(N
)))));
8577 -- Allocators do not have an identifier denoting the access type, so we
8578 -- must locate it through the expression to check whether the views are
8581 elsif Nkind
(N
) = N_Allocator
8582 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
8583 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
8584 and then Instantiating
8587 T
: constant Node_Id
:=
8588 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
8594 -- Retrieve the allocator node in the generic copy
8596 Acc_T
:= Etype
(Parent
(Parent
(T
)));
8598 if Present
(Acc_T
) and then Is_Private_Type
(Acc_T
) then
8599 Switch_View
(Acc_T
);
8606 -- Loop parameter specifications do not have an identifier denoting the
8607 -- index type, so we must locate it through the defining identifier to
8608 -- check whether the views are consistent.
8610 elsif Nkind
(N
) = N_Loop_Parameter_Specification
8611 and then Instantiating
8614 Id
: constant Entity_Id
:=
8615 Get_Associated_Entity
(Defining_Identifier
(N
));
8617 Index_T
: Entity_Id
;
8620 if Present
(Id
) and then Present
(Etype
(Id
)) then
8621 Index_T
:= First_Subtype
(Etype
(Id
));
8623 if Present
(Index_T
) and then Is_Private_Type
(Index_T
) then
8624 Switch_View
(Index_T
);
8631 -- For a proper body, we must catch the case of a proper body that
8632 -- replaces a stub. This represents the point at which a separate
8633 -- compilation unit, and hence template file, may be referenced, so we
8634 -- must make a new source instantiation entry for the template of the
8635 -- subunit, and ensure that all nodes in the subunit are adjusted using
8636 -- this new source instantiation entry.
8638 elsif Nkind
(N
) in N_Proper_Body
then
8640 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
8642 if Instantiating
and then Was_Originally_Stub
(N
) then
8643 Create_Instantiation_Source
8644 (Instantiation_Node
,
8645 Defining_Entity
(N
),
8648 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8651 -- Now copy the fields of the proper body, using the new
8652 -- adjustment factor if one was needed as per test above.
8656 -- Restore the original adjustment factor
8658 S_Adjustment
:= Save_Adjustment
;
8661 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
8663 -- Do not copy Comment or Ident pragmas their content is relevant to
8664 -- the generic unit, not to the instantiating unit.
8666 if Pragma_Name_Unmapped
(N
) in Name_Comment | Name_Ident
then
8667 New_N
:= Make_Null_Statement
(Sloc
(N
));
8669 -- Do not copy pragmas generated from aspects because the pragmas do
8670 -- not carry any semantic information, plus they will be regenerated
8673 -- However, generating C we need to copy them since postconditions
8674 -- are inlined by the front end, and the front-end inlining machinery
8675 -- relies on this routine to perform inlining.
8677 elsif From_Aspect_Specification
(N
)
8678 and then not Modify_Tree_For_C
8680 New_N
:= Make_Null_Statement
(Sloc
(N
));
8686 elsif Nkind
(N
) in N_Integer_Literal | N_Real_Literal
then
8688 -- No descendant fields need traversing
8692 elsif Nkind
(N
) = N_String_Literal
8693 and then Present
(Etype
(N
))
8694 and then Instantiating
8696 -- If the string is declared in an outer scope, the string_literal
8697 -- subtype created for it may have the wrong scope. Force reanalysis
8698 -- of the constant to generate a new itype in the proper context.
8700 Set_Etype
(New_N
, Empty
);
8701 Set_Analyzed
(New_N
, False);
8703 -- For the remaining nodes, copy their descendants recursively
8708 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
8709 Set_Generic_Parent
(Specification
(New_N
), N
);
8711 -- Should preserve Corresponding_Spec??? (12.3(14))
8715 -- Propagate dimensions if present, so that they are reflected in the
8718 if Nkind
(N
) in N_Has_Etype
8719 and then (Nkind
(N
) in N_Op
or else Is_Entity_Name
(N
))
8720 and then Present
(Etype
(N
))
8721 and then Is_Floating_Point_Type
(Etype
(N
))
8722 and then Has_Dimension_System
(Etype
(N
))
8724 Copy_Dimensions
(N
, New_N
);
8728 end Copy_Generic_Node
;
8730 ----------------------------
8731 -- Denotes_Formal_Package --
8732 ----------------------------
8734 function Denotes_Formal_Package
8736 On_Exit
: Boolean := False;
8737 Instance
: Entity_Id
:= Empty
) return Boolean
8740 Scop
: constant Entity_Id
:= Scope
(Pack
);
8743 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
8744 -- The package in question may be an actual for a previous formal
8745 -- package P of the current instance, so examine its actuals as well.
8746 -- This must be recursive over other formal packages.
8748 ----------------------------------
8749 -- Is_Actual_Of_Previous_Formal --
8750 ----------------------------------
8752 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
8756 E1
:= First_Entity
(P
);
8757 while Present
(E1
) and then E1
/= Instance
loop
8758 if Ekind
(E1
) = E_Package
8759 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
8761 if Renamed_Entity
(E1
) = Pack
then
8764 elsif E1
= P
or else Renamed_Entity
(E1
) = P
then
8767 elsif Is_Actual_Of_Previous_Formal
(E1
) then
8776 end Is_Actual_Of_Previous_Formal
;
8778 -- Start of processing for Denotes_Formal_Package
8784 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
8786 Par
:= Current_Instantiated_Parent
.Act_Id
;
8789 if Ekind
(Scop
) = E_Generic_Package
8790 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
8791 N_Generic_Subprogram_Declaration
8795 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
8796 N_Formal_Package_Declaration
8804 -- Check whether this package is associated with a formal package of
8805 -- the enclosing instantiation. Iterate over the list of renamings.
8807 E
:= First_Entity
(Par
);
8808 while Present
(E
) loop
8809 if Ekind
(E
) /= E_Package
8810 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
8814 elsif Renamed_Entity
(E
) = Par
then
8817 elsif Renamed_Entity
(E
) = Pack
then
8820 elsif Is_Actual_Of_Previous_Formal
(E
) then
8830 end Denotes_Formal_Package
;
8836 procedure End_Generic
is
8838 -- ??? More things could be factored out in this routine. Should
8839 -- probably be done at a later stage.
8841 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
8842 Generic_Flags
.Decrement_Last
;
8844 Expander_Mode_Restore
;
8851 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
8852 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
8853 -- Find distance from given node to enclosing compilation unit
8859 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
8862 and then Nkind
(P
) /= N_Compilation_Unit
8864 P
:= True_Parent
(P
);
8869 -- Local declarations
8878 -- Start of processing for Earlier
8881 Find_Depth
(P1
, D1
);
8882 Find_Depth
(P2
, D2
);
8892 P1
:= True_Parent
(P1
);
8897 P2
:= True_Parent
(P2
);
8901 -- At this point P1 and P2 are at the same distance from the root.
8902 -- We examine their parents until we find a common declarative list.
8903 -- If we reach the root, N1 and N2 do not descend from the same
8904 -- declarative list (e.g. one is nested in the declarative part and
8905 -- the other is in a block in the statement part) and the earlier
8906 -- one is already frozen.
8908 while not Is_List_Member
(P1
)
8909 or else not Is_List_Member
(P2
)
8910 or else not In_Same_List
(P1
, P2
)
8912 P1
:= True_Parent
(P1
);
8913 P2
:= True_Parent
(P2
);
8915 if Nkind
(Parent
(P1
)) = N_Subunit
then
8916 P1
:= Corresponding_Stub
(Parent
(P1
));
8919 if Nkind
(Parent
(P2
)) = N_Subunit
then
8920 P2
:= Corresponding_Stub
(Parent
(P2
));
8928 -- Expanded code usually shares the source location of the original
8929 -- construct it was generated for. This however may not necessarily
8930 -- reflect the true location of the code within the tree.
8932 -- Before comparing the slocs of the two nodes, make sure that we are
8933 -- working with correct source locations. Assume that P1 is to the left
8934 -- of P2. If either one does not come from source, traverse the common
8935 -- list heading towards the other node and locate the first source
8939 -- ----+===+===+--------------+===+===+----
8940 -- expanded code expanded code
8942 if not Comes_From_Source
(P1
) then
8943 while Present
(P1
) loop
8945 -- Neither P2 nor a source statement were located during the
8946 -- search. If we reach the end of the list, then P1 does not
8947 -- occur earlier than P2.
8950 -- start --- P2 ----- P1 --- end
8952 if No
(Next
(P1
)) then
8955 -- We encounter P2 while going to the right of the list. This
8956 -- means that P1 does indeed appear earlier.
8959 -- start --- P1 ===== P2 --- end
8960 -- expanded code in between
8965 -- No need to look any further since we have located a source
8968 elsif Comes_From_Source
(P1
) then
8978 if not Comes_From_Source
(P2
) then
8979 while Present
(P2
) loop
8981 -- Neither P1 nor a source statement were located during the
8982 -- search. If we reach the start of the list, then P1 does not
8983 -- occur earlier than P2.
8986 -- start --- P2 --- P1 --- end
8988 if No
(Prev
(P2
)) then
8991 -- We encounter P1 while going to the left of the list. This
8992 -- means that P1 does indeed appear earlier.
8995 -- start --- P1 ===== P2 --- end
8996 -- expanded code in between
9001 -- No need to look any further since we have located a source
9004 elsif Comes_From_Source
(P2
) then
9014 -- At this point either both nodes came from source or we approximated
9015 -- their source locations through neighboring source statements.
9017 T1
:= Top_Level_Location
(Sloc
(P1
));
9018 T2
:= Top_Level_Location
(Sloc
(P2
));
9020 -- When two nodes come from the same instance, they have identical top
9021 -- level locations. To determine proper relation within the tree, check
9022 -- their locations within the template.
9025 return Sloc
(P1
) < Sloc
(P2
);
9027 -- The two nodes either come from unrelated instances or do not come
9028 -- from instantiated code at all.
9035 ----------------------
9036 -- Find_Actual_Type --
9037 ----------------------
9039 function Find_Actual_Type
9041 Gen_Type
: Entity_Id
) return Entity_Id
9043 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
9047 -- Special processing only applies to child units
9049 if not Is_Child_Unit
(Gen_Scope
) then
9050 return Get_Instance_Of
(Typ
);
9052 -- If designated or component type is itself a formal of the child unit,
9053 -- its instance is available.
9055 elsif Scope
(Typ
) = Gen_Scope
then
9056 return Get_Instance_Of
(Typ
);
9058 -- If the array or access type is not declared in the parent unit,
9059 -- no special processing needed.
9061 elsif not Is_Generic_Type
(Typ
)
9062 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
9064 return Get_Instance_Of
(Typ
);
9066 -- Otherwise, retrieve designated or component type by visibility
9069 T
:= Current_Entity
(Typ
);
9070 while Present
(T
) loop
9071 if In_Open_Scopes
(Scope
(T
)) then
9073 elsif Is_Generic_Actual_Type
(T
) then
9082 end Find_Actual_Type
;
9084 -----------------------------
9085 -- Freeze_Package_Instance --
9086 -----------------------------
9088 procedure Freeze_Package_Instance
9094 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean;
9095 -- Check if the generic definition and the instantiation come from
9096 -- a common scope, in which case the instance must be frozen after
9097 -- the generic body.
9099 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
;
9100 -- If the instance is nested inside a generic unit, the Sloc of the
9101 -- instance indicates the place of the original definition, not the
9102 -- point of the current enclosing instance. Pending a better usage of
9103 -- Slocs to indicate instantiation places, we determine the place of
9104 -- origin of a node by finding the maximum sloc of any ancestor node.
9106 -- Why is this not equivalent to Top_Level_Location ???
9112 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean is
9113 Act_Scop
: Entity_Id
:= Scope
(Act_Id
);
9114 Gen_Scop
: Entity_Id
:= Scope
(Gen_Id
);
9117 while Act_Scop
/= Standard_Standard
9118 and then Gen_Scop
/= Standard_Standard
9120 if Act_Scop
= Gen_Scop
then
9124 Act_Scop
:= Scope
(Act_Scop
);
9125 Gen_Scop
:= Scope
(Gen_Scop
);
9135 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
is
9142 while Present
(N1
) and then N1
/= Act_Unit
loop
9143 if Sloc
(N1
) > Res
then
9155 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N
);
9156 Par_Id
: constant Entity_Id
:= Scope
(Gen_Id
);
9157 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
9158 Gen_Unit
: constant Node_Id
:=
9159 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
9161 Body_Unit
: Node_Id
;
9163 Must_Delay
: Boolean;
9164 Orig_Body
: Node_Id
;
9166 -- Start of processing for Freeze_Package_Instance
9169 -- If the body is a subunit, the freeze point is the corresponding stub
9170 -- in the current compilation, not the subunit itself.
9172 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
9173 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
9175 Orig_Body
:= Gen_Body
;
9178 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
9180 -- If the instantiation and the generic definition appear in the same
9181 -- package declaration, this is an early instantiation. If they appear
9182 -- in the same declarative part, it is an early instantiation only if
9183 -- the generic body appears textually later, and the generic body is
9184 -- also in the main unit.
9186 -- If instance is nested within a subprogram, and the generic body
9187 -- is not, the instance is delayed because the enclosing body is. If
9188 -- instance and body are within the same scope, or the same subprogram
9189 -- body, indicate explicitly that the instance is delayed.
9192 (Gen_Unit
= Act_Unit
9193 and then (Nkind
(Gen_Unit
) in N_Generic_Package_Declaration
9194 | N_Package_Declaration
9195 or else (Gen_Unit
= Body_Unit
9197 True_Sloc
(N
, Act_Unit
) < Sloc
(Orig_Body
)))
9198 and then Is_In_Main_Unit
(Original_Node
(Gen_Unit
))
9199 and then In_Same_Scope
(Gen_Id
, Act_Id
));
9201 -- If this is an early instantiation, the freeze node is placed after
9202 -- the generic body. Otherwise, if the generic appears in an instance,
9203 -- we cannot freeze the current instance until the outer one is frozen.
9204 -- This is only relevant if the current instance is nested within some
9205 -- inner scope not itself within the outer instance. If this scope is
9206 -- a package body in the same declarative part as the outer instance,
9207 -- then that body needs to be frozen after the outer instance. Finally,
9208 -- if no delay is needed, we place the freeze node at the end of the
9209 -- current declarative part.
9211 if No
(Freeze_Node
(Act_Id
))
9212 or else not Is_List_Member
(Freeze_Node
(Act_Id
))
9214 Ensure_Freeze_Node
(Act_Id
);
9215 F_Node
:= Freeze_Node
(Act_Id
);
9218 Insert_After
(Orig_Body
, F_Node
);
9220 elsif Is_Generic_Instance
(Par_Id
)
9221 and then Present
(Freeze_Node
(Par_Id
))
9222 and then Scope
(Act_Id
) /= Par_Id
9224 -- Freeze instance of inner generic after instance of enclosing
9227 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
) then
9229 -- Handle the following case:
9231 -- package Parent_Inst is new ...
9232 -- freeze Parent_Inst []
9234 -- procedure P ... -- this body freezes Parent_Inst
9236 -- package Inst is new ...
9238 -- In this particular scenario, the freeze node for Inst must
9239 -- be inserted in the same manner as that of Parent_Inst,
9240 -- before the next source body or at the end of the declarative
9241 -- list (body not available). If body P did not exist and
9242 -- Parent_Inst was frozen after Inst, either by a body
9243 -- following Inst or at the end of the declarative region,
9244 -- the freeze node for Inst must be inserted after that of
9245 -- Parent_Inst. This relation is established by comparing
9246 -- the Slocs of Parent_Inst freeze node and Inst.
9247 -- We examine the parents of the enclosing lists to handle
9248 -- the case where the parent instance is in the visible part
9249 -- of a package declaration, and the inner instance is in
9250 -- the corresponding private part.
9252 if Parent
(List_Containing
(Freeze_Node
(Par_Id
)))
9253 = Parent
(List_Containing
(N
))
9254 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9256 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9258 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9261 -- Freeze package enclosing instance of inner generic after
9262 -- instance of enclosing generic.
9264 elsif Nkind
(Parent
(N
)) in N_Package_Body | N_Subprogram_Body
9265 and then In_Same_Declarative_Part
9266 (Parent
(Freeze_Node
(Par_Id
)), Parent
(N
))
9269 Enclosing
: Entity_Id
;
9272 Enclosing
:= Corresponding_Spec
(Parent
(N
));
9274 if No
(Enclosing
) then
9275 Enclosing
:= Defining_Entity
(Parent
(N
));
9278 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9279 Ensure_Freeze_Node
(Enclosing
);
9281 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
9283 -- The enclosing context is a subunit, insert the freeze
9284 -- node after the stub.
9286 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
9287 Insert_Freeze_Node_For_Instance
9288 (Corresponding_Stub
(Parent
(Parent
(N
))),
9289 Freeze_Node
(Enclosing
));
9291 -- The enclosing context is a package with a stub body
9292 -- which has already been replaced by the real body.
9293 -- Insert the freeze node after the actual body.
9295 elsif Ekind
(Enclosing
) = E_Package
9296 and then Present
(Body_Entity
(Enclosing
))
9297 and then Was_Originally_Stub
9298 (Parent
(Body_Entity
(Enclosing
)))
9300 Insert_Freeze_Node_For_Instance
9301 (Parent
(Body_Entity
(Enclosing
)),
9302 Freeze_Node
(Enclosing
));
9304 -- The parent instance has been frozen before the body of
9305 -- the enclosing package, insert the freeze node after
9308 elsif In_Same_List
(Freeze_Node
(Par_Id
), Parent
(N
))
9310 Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(Parent
(N
))
9312 Insert_Freeze_Node_For_Instance
9313 (Parent
(N
), Freeze_Node
(Enclosing
));
9317 (Freeze_Node
(Par_Id
), Freeze_Node
(Enclosing
));
9323 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9327 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9330 end Freeze_Package_Instance
;
9332 --------------------------------
9333 -- Freeze_Subprogram_Instance --
9334 --------------------------------
9336 procedure Freeze_Subprogram_Instance
9339 Pack_Id
: Entity_Id
)
9341 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
9342 -- Find innermost package body that encloses the given node, and which
9343 -- is not a compilation unit. Freeze nodes for the instance, or for its
9344 -- enclosing body, may be inserted after the enclosing_body of the
9345 -- generic unit. Used to determine proper placement of freeze node for
9346 -- both package and subprogram instances.
9348 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
9349 -- Find entity for given package body, and locate or create a freeze
9352 ----------------------------
9353 -- Enclosing_Package_Body --
9354 ----------------------------
9356 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
9362 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9364 if Nkind
(P
) = N_Package_Body
then
9365 if Nkind
(Parent
(P
)) = N_Subunit
then
9366 return Corresponding_Stub
(Parent
(P
));
9372 P
:= True_Parent
(P
);
9376 end Enclosing_Package_Body
;
9378 -------------------------
9379 -- Package_Freeze_Node --
9380 -------------------------
9382 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
9386 if Nkind
(B
) = N_Package_Body
then
9387 Id
:= Corresponding_Spec
(B
);
9388 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
9389 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
9392 Ensure_Freeze_Node
(Id
);
9393 return Freeze_Node
(Id
);
9394 end Package_Freeze_Node
;
9398 Enc_G
: constant Node_Id
:= Enclosing_Package_Body
(Gen_Body
);
9399 Enc_N
: constant Node_Id
:= Enclosing_Package_Body
(N
);
9400 Par_Id
: constant Entity_Id
:= Scope
(Get_Generic_Entity
(N
));
9405 -- Start of processing for Freeze_Subprogram_Instance
9408 -- If the instance and the generic body appear within the same unit, and
9409 -- the instance precedes the generic, the freeze node for the instance
9410 -- must appear after that of the generic. If the generic is nested
9411 -- within another instance I2, then current instance must be frozen
9412 -- after I2. In both cases, the freeze nodes are those of enclosing
9413 -- packages. Otherwise, the freeze node is placed at the end of the
9414 -- current declarative part.
9416 Ensure_Freeze_Node
(Pack_Id
);
9417 F_Node
:= Freeze_Node
(Pack_Id
);
9419 if Is_Generic_Instance
(Par_Id
)
9420 and then Present
(Freeze_Node
(Par_Id
))
9421 and then In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
)
9423 -- The parent was a premature instantiation. Insert freeze node at
9424 -- the end the current declarative part.
9426 if Is_Known_Guaranteed_ABE
(Get_Unit_Instantiation_Node
(Par_Id
)) then
9427 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9429 -- Handle the following case:
9431 -- package Parent_Inst is new ...
9432 -- freeze Parent_Inst []
9434 -- procedure P ... -- this body freezes Parent_Inst
9436 -- procedure Inst is new ...
9438 -- In this particular scenario, the freeze node for Inst must be
9439 -- inserted in the same manner as that of Parent_Inst - before the
9440 -- next source body or at the end of the declarative list (body not
9441 -- available). If body P did not exist and Parent_Inst was frozen
9442 -- after Inst, either by a body following Inst or at the end of the
9443 -- declarative region, the freeze node for Inst must be inserted
9444 -- after that of Parent_Inst. This relation is established by
9445 -- comparing the Slocs of Parent_Inst freeze node and Inst.
9447 elsif In_Same_List
(Freeze_Node
(Par_Id
), N
)
9448 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9450 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9453 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9456 -- The body enclosing the instance should be frozen after the body that
9457 -- includes the generic, because the body of the instance may make
9458 -- references to entities therein. If the two are not in the same
9459 -- declarative part, or if the one enclosing the instance is frozen
9460 -- already, freeze the instance at the end of the current declarative
9463 elsif Is_Generic_Instance
(Par_Id
)
9464 and then Present
(Freeze_Node
(Par_Id
))
9465 and then Present
(Enc_N
)
9467 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), Enc_N
)
9469 -- The enclosing package may contain several instances. Rather
9470 -- than computing the earliest point at which to insert its freeze
9471 -- node, we place it at the end of the declarative part of the
9472 -- parent of the generic.
9474 Insert_Freeze_Node_For_Instance
9475 (Freeze_Node
(Par_Id
), Package_Freeze_Node
(Enc_N
));
9478 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9480 elsif Present
(Enc_G
)
9481 and then Present
(Enc_N
)
9482 and then Enc_G
/= Enc_N
9483 and then Earlier
(N
, Gen_Body
)
9485 -- Freeze package that encloses instance, and place node after the
9486 -- package that encloses generic. If enclosing package is already
9487 -- frozen we have to assume it is at the proper place. This may be a
9488 -- potential ABE that requires dynamic checking. Do not add a freeze
9489 -- node if the package that encloses the generic is inside the body
9490 -- that encloses the instance, because the freeze node would be in
9491 -- the wrong scope. Additional contortions needed if the bodies are
9492 -- within a subunit.
9495 Enclosing_Body
: Node_Id
;
9498 if Nkind
(Enc_N
) = N_Package_Body_Stub
then
9499 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_N
)));
9501 Enclosing_Body
:= Enc_N
;
9504 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
9505 Insert_Freeze_Node_For_Instance
9506 (Enc_G
, Package_Freeze_Node
(Enc_N
));
9510 -- Freeze enclosing subunit before instance
9512 Enc_G_F
:= Package_Freeze_Node
(Enc_G
);
9514 if not Is_List_Member
(Enc_G_F
) then
9515 Insert_After
(Enc_G
, Enc_G_F
);
9518 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9521 -- If none of the above, insert freeze node at the end of the current
9522 -- declarative part.
9524 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9526 end Freeze_Subprogram_Instance
;
9532 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
9534 return Generic_Renamings
.Table
(E
).Gen_Id
;
9537 ---------------------
9538 -- Get_Instance_Of --
9539 ---------------------
9541 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
9542 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
9545 if Res
/= Assoc_Null
then
9546 return Generic_Renamings
.Table
(Res
).Act_Id
;
9549 -- On exit, entity is not instantiated: not a generic parameter, or
9550 -- else parameter of an inner generic unit.
9554 end Get_Instance_Of
;
9556 ---------------------------------
9557 -- Get_Unit_Instantiation_Node --
9558 ---------------------------------
9560 function Get_Unit_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
9561 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
9565 -- If the Package_Instantiation attribute has been set on the package
9566 -- entity, then use it directly when it (or its Original_Node) refers
9567 -- to an N_Package_Instantiation node. In principle it should be
9568 -- possible to have this field set in all cases, which should be
9569 -- investigated, and would allow this function to be significantly
9572 Inst
:= Package_Instantiation
(A
);
9574 if Present
(Inst
) then
9575 if Nkind
(Inst
) = N_Package_Instantiation
then
9578 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
9579 return Original_Node
(Inst
);
9583 -- If the instantiation is a compilation unit that does not need body
9584 -- then the instantiation node has been rewritten as a package
9585 -- declaration for the instance, and we return the original node.
9587 -- If it is a compilation unit and the instance node has not been
9588 -- rewritten, then it is still the unit of the compilation. Finally, if
9589 -- a body is present, this is a parent of the main unit whose body has
9590 -- been compiled for inlining purposes, and the instantiation node has
9591 -- been rewritten with the instance body.
9593 -- Otherwise the instantiation node appears after the declaration. If
9594 -- the entity is a formal package, the declaration may have been
9595 -- rewritten as a generic declaration (in the case of a formal with box)
9596 -- or left as a formal package declaration if it has actuals, and is
9597 -- found with a forward search.
9599 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
9600 if Nkind
(Decl
) = N_Package_Declaration
9601 and then Present
(Corresponding_Body
(Decl
))
9603 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
9606 if Nkind
(Original_Node
(Decl
)) in N_Generic_Instantiation
then
9607 return Original_Node
(Decl
);
9609 return Unit
(Parent
(Decl
));
9612 elsif Nkind
(Decl
) = N_Package_Declaration
9613 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
9615 return Original_Node
(Decl
);
9618 Inst
:= Next
(Decl
);
9619 while Nkind
(Inst
) not in N_Formal_Package_Declaration
9620 | N_Function_Instantiation
9621 | N_Package_Instantiation
9622 | N_Procedure_Instantiation
9629 end Get_Unit_Instantiation_Node
;
9631 ------------------------
9632 -- Has_Been_Exchanged --
9633 ------------------------
9635 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
9639 Next
:= First_Elmt
(Exchanged_Views
);
9640 while Present
(Next
) loop
9641 if Full_View
(Node
(Next
)) = E
then
9649 end Has_Been_Exchanged
;
9655 function Has_Contracts
(Decl
: Node_Id
) return Boolean is
9656 A_List
: constant List_Id
:= Aspect_Specifications
(Decl
);
9663 A_Spec
:= First
(A_List
);
9664 while Present
(A_Spec
) loop
9665 A_Id
:= Get_Aspect_Id
(A_Spec
);
9666 if A_Id
= Aspect_Pre
or else A_Id
= Aspect_Post
then
9681 function Hash
(F
: Entity_Id
) return HTable_Range
is
9683 return HTable_Range
(F
mod HTable_Size
);
9686 ------------------------
9687 -- Hide_Current_Scope --
9688 ------------------------
9690 procedure Hide_Current_Scope
is
9691 C
: constant Entity_Id
:= Current_Scope
;
9695 Set_Is_Hidden_Open_Scope
(C
);
9697 E
:= First_Entity
(C
);
9698 while Present
(E
) loop
9699 if Is_Immediately_Visible
(E
) then
9700 Set_Is_Immediately_Visible
(E
, False);
9701 Append_Elmt
(E
, Hidden_Entities
);
9707 -- Make the scope name invisible as well. This is necessary, but might
9708 -- conflict with calls to Rtsfind later on, in case the scope is a
9709 -- predefined one. There is no clean solution to this problem, so for
9710 -- now we depend on the user not redefining Standard itself in one of
9711 -- the parent units.
9713 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
9714 Set_Is_Immediately_Visible
(C
, False);
9715 Append_Elmt
(C
, Hidden_Entities
);
9718 end Hide_Current_Scope
;
9724 procedure Init_Env
is
9725 Saved
: Instance_Env
;
9728 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
9729 Saved
.Exchanged_Views
:= Exchanged_Views
;
9730 Saved
.Hidden_Entities
:= Hidden_Entities
;
9731 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
9732 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
9733 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
9735 -- Save configuration switches. These may be reset if the unit is a
9736 -- predefined unit, and the current mode is not Ada 2005.
9738 Saved
.Switches
:= Save_Config_Switches
;
9740 Instance_Envs
.Append
(Saved
);
9742 Exchanged_Views
:= New_Elmt_List
;
9743 Hidden_Entities
:= New_Elmt_List
;
9745 -- Make dummy entry for Instantiated parent. If generic unit is legal,
9746 -- this is set properly in Set_Instance_Env.
9748 Current_Instantiated_Parent
:=
9749 (Current_Scope
, Current_Scope
, Assoc_Null
);
9752 ---------------------
9753 -- In_Main_Context --
9754 ---------------------
9756 function In_Main_Context
(E
: Entity_Id
) return Boolean is
9762 if not Is_Compilation_Unit
(E
)
9763 or else Ekind
(E
) /= E_Package
9764 or else In_Private_Part
(E
)
9769 Context
:= Context_Items
(Cunit
(Main_Unit
));
9771 Clause
:= First
(Context
);
9772 while Present
(Clause
) loop
9773 if Nkind
(Clause
) = N_With_Clause
then
9774 Nam
:= Name
(Clause
);
9776 -- If the current scope is part of the context of the main unit,
9777 -- analysis of the corresponding with_clause is not complete, and
9778 -- the entity is not set. We use the Chars field directly, which
9779 -- might produce false positives in rare cases, but guarantees
9780 -- that we produce all the instance bodies we will need.
9782 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
9783 or else (Nkind
(Nam
) = N_Selected_Component
9784 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
9794 end In_Main_Context
;
9796 ---------------------
9797 -- Inherit_Context --
9798 ---------------------
9800 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
9801 Current_Context
: List_Id
;
9802 Current_Unit
: Node_Id
;
9811 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
9813 -- The inherited context is attached to the enclosing compilation
9814 -- unit. This is either the main unit, or the declaration for the
9815 -- main unit (in case the instantiation appears within the package
9816 -- declaration and the main unit is its body).
9818 Current_Unit
:= Parent
(Inst
);
9819 while Present
(Current_Unit
)
9820 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
9822 Current_Unit
:= Parent
(Current_Unit
);
9825 Current_Context
:= Context_Items
(Current_Unit
);
9827 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
9828 while Present
(Item
) loop
9829 if Nkind
(Item
) = N_With_Clause
then
9830 Lib_Unit
:= Library_Unit
(Item
);
9832 -- Take care to prevent direct cyclic with's
9834 if Lib_Unit
/= Current_Unit
then
9836 -- Do not add a unit if it is already in the context
9838 Clause
:= First
(Current_Context
);
9840 while Present
(Clause
) loop
9841 if Nkind
(Clause
) = N_With_Clause
9842 and then Library_Unit
(Clause
) = Lib_Unit
9852 New_I
:= New_Copy
(Item
);
9853 Set_Implicit_With
(New_I
);
9855 Append
(New_I
, Current_Context
);
9863 end Inherit_Context
;
9869 procedure Initialize
is
9871 Generic_Renamings
.Init
;
9874 Generic_Renamings_HTable
.Reset
;
9875 Circularity_Detected
:= False;
9876 Exchanged_Views
:= No_Elist
;
9877 Hidden_Entities
:= No_Elist
;
9880 -------------------------------------
9881 -- Insert_Freeze_Node_For_Instance --
9882 -------------------------------------
9884 procedure Insert_Freeze_Node_For_Instance
9888 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
9889 -- Find enclosing package or subprogram body, if any. Freeze node may
9890 -- be placed at end of current declarative list if previous instance
9891 -- and current one have different enclosing bodies.
9893 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
9894 -- Find the local instance, if any, that declares the generic that is
9895 -- being instantiated. If present, the freeze node for this instance
9896 -- must follow the freeze node for the previous instance.
9898 --------------------
9899 -- Enclosing_Body --
9900 --------------------
9902 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
9908 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9910 if Nkind
(P
) in N_Package_Body | N_Subprogram_Body
then
9911 if Nkind
(Parent
(P
)) = N_Subunit
then
9912 return Corresponding_Stub
(Parent
(P
));
9918 P
:= True_Parent
(P
);
9924 -----------------------
9925 -- Previous_Instance --
9926 -----------------------
9928 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
9933 while Present
(S
) and then S
/= Standard_Standard
loop
9934 if Is_Generic_Instance
(S
)
9935 and then In_Same_Source_Unit
(S
, N
)
9944 end Previous_Instance
;
9955 -- Start of processing for Insert_Freeze_Node_For_Instance
9958 -- Nothing to do if the freeze node has already been inserted
9960 if Is_List_Member
(F_Node
) then
9964 Inst
:= Entity
(F_Node
);
9966 -- When processing a subprogram instantiation, utilize the actual
9967 -- subprogram instantiation rather than its package wrapper as it
9968 -- carries all the context information.
9970 if Is_Wrapper_Package
(Inst
) then
9971 Inst
:= Related_Instance
(Inst
);
9974 Par_Inst
:= Parent
(Inst
);
9976 -- If this is a package instance, check whether the generic is declared
9977 -- in a previous instance and the current instance is not within the
9980 if Present
(Generic_Parent
(Par_Inst
)) and then Is_In_Main_Unit
(N
) then
9982 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
9983 Par_I
: constant Entity_Id
:=
9984 Previous_Instance
(Generic_Parent
(Par_Inst
));
9988 if Present
(Par_I
) and then Earlier
(N
, Freeze_Node
(Par_I
)) then
9989 Scop
:= Scope
(Inst
);
9991 -- If the current instance is within the one that contains
9992 -- the generic, the freeze node for the current one must
9993 -- appear in the current declarative part. Ditto, if the
9994 -- current instance is within another package instance or
9995 -- within a body that does not enclose the current instance.
9996 -- In these three cases the freeze node of the previous
9997 -- instance is not relevant.
9999 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
10000 exit when Scop
= Par_I
10002 (Is_Generic_Instance
(Scop
)
10003 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
10004 Scop
:= Scope
(Scop
);
10007 -- Previous instance encloses current instance
10009 if Scop
= Par_I
then
10012 -- If the next node is a source body we must freeze in the
10013 -- current scope as well.
10015 elsif Present
(Next
(N
))
10016 and then Nkind
(Next
(N
)) in N_Subprogram_Body
10018 and then Comes_From_Source
(Next
(N
))
10022 -- Current instance is within an unrelated instance
10024 elsif Is_Generic_Instance
(Scop
) then
10027 -- Current instance is within an unrelated body
10029 elsif Present
(Enclosing_N
)
10030 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
10035 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
10043 Decls
:= List_Containing
(N
);
10044 Par_N
:= Parent
(Decls
);
10047 -- Determine the proper freeze point of an instantiation
10049 if Is_Generic_Instance
(Inst
) then
10051 -- When the instantiation occurs in a package spec, append the
10052 -- freeze node to the private declarations (if any).
10054 if Nkind
(Par_N
) = N_Package_Specification
10055 and then Decls
= Visible_Declarations
(Par_N
)
10056 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
10058 Decls
:= Private_Declarations
(Par_N
);
10059 Decl
:= First
(Decls
);
10062 -- We adhere to the general rule of a package or subprogram body
10063 -- causing freezing of anything before it in the same declarative
10064 -- region. In this respect, the proper freeze point of a package
10065 -- instantiation is before the first source body which follows, or
10066 -- before a stub. This ensures that entities from the instance are
10067 -- already frozen and therefore usable in source bodies.
10069 if Nkind
(Par_N
) /= N_Package_Declaration
10071 not In_Same_Source_Unit
(Generic_Parent
(Par_Inst
), Inst
)
10073 while Present
(Decl
) loop
10074 if ((Nkind
(Decl
) in N_Unit_Body
10076 Nkind
(Decl
) in N_Body_Stub
)
10077 and then Comes_From_Source
(Decl
))
10078 or else (Present
(Origin
)
10079 and then Nkind
(Decl
) in N_Generic_Instantiation
10080 and then Instance_Spec
(Decl
) /= Origin
)
10082 Set_Sloc
(F_Node
, Sloc
(Decl
));
10083 Insert_Before
(Decl
, F_Node
);
10091 -- When the instantiation occurs in a package spec and there is
10092 -- no source body which follows, and the package has a body but
10093 -- is delayed, then insert immediately before its freeze node.
10095 if Nkind
(Par_N
) = N_Package_Specification
10096 and then Present
(Corresponding_Body
(Parent
(Par_N
)))
10097 and then Present
(Freeze_Node
(Defining_Entity
(Par_N
)))
10099 Set_Sloc
(F_Node
, Sloc
(Freeze_Node
(Defining_Entity
(Par_N
))));
10100 Insert_Before
(Freeze_Node
(Defining_Entity
(Par_N
)), F_Node
);
10103 -- When the instantiation occurs in a package spec and there is
10104 -- no source body which follows, not even of the package itself,
10105 -- then insert into the declaration list of the outer level, but
10106 -- do not jump over following instantiations in this list because
10107 -- they may have a body that has not materialized yet, see above.
10109 elsif Nkind
(Par_N
) = N_Package_Specification
10110 and then No
(Corresponding_Body
(Parent
(Par_N
)))
10111 and then Is_List_Member
(Parent
(Par_N
))
10113 Decl
:= Parent
(Par_N
);
10114 Decls
:= List_Containing
(Decl
);
10115 Par_N
:= Parent
(Decls
);
10118 -- In a package declaration, or if no source body which follows
10119 -- and at library level, then insert at end of list.
10127 -- Insert and adjust the Sloc of the freeze node
10129 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
10130 Insert_After
(Last
(Decls
), F_Node
);
10131 end Insert_Freeze_Node_For_Instance
;
10133 -----------------------------
10134 -- Install_Formal_Packages --
10135 -----------------------------
10137 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
10140 Gen_E
: Entity_Id
:= Empty
;
10143 E
:= First_Entity
(Par
);
10145 -- If we are installing an instance parent, locate the formal packages
10146 -- of its generic parent.
10148 if Is_Generic_Instance
(Par
) then
10149 Gen
:= Generic_Parent
(Package_Specification
(Par
));
10150 Gen_E
:= First_Entity
(Gen
);
10153 while Present
(E
) loop
10154 if Ekind
(E
) = E_Package
10155 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
10157 -- If this is the renaming for the parent instance, done
10159 if Renamed_Entity
(E
) = Par
then
10162 -- The visibility of a formal of an enclosing generic is already
10165 elsif Denotes_Formal_Package
(E
) then
10168 elsif Present
(Associated_Formal_Package
(E
)) then
10169 Check_Generic_Actuals
(Renamed_Entity
(E
), True);
10170 Set_Is_Hidden
(E
, False);
10172 -- Find formal package in generic unit that corresponds to
10173 -- (instance of) formal package in instance.
10175 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
10176 Next_Entity
(Gen_E
);
10179 if Present
(Gen_E
) then
10180 Map_Formal_Package_Entities
(Gen_E
, E
);
10187 if Present
(Gen_E
) then
10188 Next_Entity
(Gen_E
);
10191 end Install_Formal_Packages
;
10193 --------------------
10194 -- Install_Parent --
10195 --------------------
10197 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
10198 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
10199 S
: constant Entity_Id
:= Current_Scope
;
10200 Inst_Par
: Entity_Id
;
10201 First_Par
: Entity_Id
;
10202 Inst_Node
: Node_Id
;
10203 Gen_Par
: Entity_Id
;
10204 First_Gen
: Entity_Id
;
10207 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
10208 -- Install the scopes of noninstance parent units ending with Par
10210 procedure Install_Spec
(Par
: Entity_Id
);
10211 -- The child unit is within the declarative part of the parent, so the
10212 -- declarations within the parent are immediately visible.
10214 -------------------------------
10215 -- Install_Noninstance_Specs --
10216 -------------------------------
10218 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
10221 and then Par
/= Standard_Standard
10222 and then not In_Open_Scopes
(Par
)
10224 Install_Noninstance_Specs
(Scope
(Par
));
10225 Install_Spec
(Par
);
10227 end Install_Noninstance_Specs
;
10233 procedure Install_Spec
(Par
: Entity_Id
) is
10234 Spec
: constant Node_Id
:= Package_Specification
(Par
);
10237 -- If this parent of the child instance is a top-level unit,
10238 -- then record the unit and its visibility for later resetting in
10239 -- Remove_Parent. We exclude units that are generic instances, as we
10240 -- only want to record this information for the ultimate top-level
10241 -- noninstance parent (is that always correct???).
10243 if Scope
(Par
) = Standard_Standard
10244 and then not Is_Generic_Instance
(Par
)
10246 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
10247 Instance_Parent_Unit
:= Par
;
10250 -- Open the parent scope and make it and its declarations visible.
10251 -- If this point is not within a body, then only the visible
10252 -- declarations should be made visible, and installation of the
10253 -- private declarations is deferred until the appropriate point
10254 -- within analysis of the spec being instantiated (see the handling
10255 -- of parent visibility in Analyze_Package_Specification). This is
10256 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
10257 -- private view problems that occur when compiling instantiations of
10258 -- a generic child of that package (Generic_Dispatching_Constructor).
10259 -- If the instance freezes a tagged type, inlinings of operations
10260 -- from Ada.Tags may need the full view of type Tag. If inlining took
10261 -- proper account of establishing visibility of inlined subprograms'
10262 -- parents then it should be possible to remove this
10263 -- special check. ???
10266 Set_Is_Immediately_Visible
(Par
);
10267 Install_Visible_Declarations
(Par
);
10268 Set_Use
(Visible_Declarations
(Spec
));
10270 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
10271 Install_Private_Declarations
(Par
);
10272 Set_Use
(Private_Declarations
(Spec
));
10276 -- Start of processing for Install_Parent
10279 -- We need to install the parent instance to compile the instantiation
10280 -- of the child, but the child instance must appear in the current
10281 -- scope. Given that we cannot place the parent above the current scope
10282 -- in the scope stack, we duplicate the current scope and unstack both
10283 -- after the instantiation is complete.
10285 -- If the parent is itself the instantiation of a child unit, we must
10286 -- also stack the instantiation of its parent, and so on. Each such
10287 -- ancestor is the prefix of the name in a prior instantiation.
10289 -- If this is a nested instance, the parent unit itself resolves to
10290 -- a renaming of the parent instance, whose declaration we need.
10292 -- Finally, the parent may be a generic (not an instance) when the
10293 -- child unit appears as a formal package.
10297 if Present
(Renamed_Entity
(Inst_Par
)) then
10298 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10301 First_Par
:= Inst_Par
;
10303 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10305 First_Gen
:= Gen_Par
;
10307 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
10309 -- Load grandparent instance as well
10311 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
10313 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
10314 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
10316 if Present
(Renamed_Entity
(Inst_Par
)) then
10317 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10320 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10322 if Present
(Gen_Par
) then
10323 Prepend_Elmt
(Inst_Par
, Ancestors
);
10326 -- Parent is not the name of an instantiation
10328 Install_Noninstance_Specs
(Inst_Par
);
10339 if Present
(First_Gen
) then
10340 Append_Elmt
(First_Par
, Ancestors
);
10342 Install_Noninstance_Specs
(First_Par
);
10345 if not Is_Empty_Elmt_List
(Ancestors
) then
10346 Elmt
:= First_Elmt
(Ancestors
);
10347 while Present
(Elmt
) loop
10348 Install_Spec
(Node
(Elmt
));
10349 Install_Formal_Packages
(Node
(Elmt
));
10354 if not In_Body
then
10357 end Install_Parent
;
10359 -------------------------------
10360 -- Install_Hidden_Primitives --
10361 -------------------------------
10363 procedure Install_Hidden_Primitives
10364 (Prims_List
: in out Elist_Id
;
10369 List
: Elist_Id
:= No_Elist
;
10370 Prim_G_Elmt
: Elmt_Id
;
10371 Prim_A_Elmt
: Elmt_Id
;
10376 -- No action needed in case of serious errors because we cannot trust
10377 -- in the order of primitives
10379 if Serious_Errors_Detected
> 0 then
10382 -- No action possible if we don't have available the list of primitive
10386 or else not Is_Record_Type
(Gen_T
)
10387 or else not Is_Tagged_Type
(Gen_T
)
10388 or else not Is_Record_Type
(Act_T
)
10389 or else not Is_Tagged_Type
(Act_T
)
10393 -- There is no need to handle interface types since their primitives
10394 -- cannot be hidden
10396 elsif Is_Interface
(Gen_T
) then
10400 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
10402 if not Is_Class_Wide_Type
(Act_T
) then
10403 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
10405 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
10409 -- Skip predefined primitives in the generic formal
10411 while Present
(Prim_G_Elmt
)
10412 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
10414 Next_Elmt
(Prim_G_Elmt
);
10417 -- Skip predefined primitives in the generic actual
10419 while Present
(Prim_A_Elmt
)
10420 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
10422 Next_Elmt
(Prim_A_Elmt
);
10425 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
10427 Prim_G
:= Node
(Prim_G_Elmt
);
10428 Prim_A
:= Node
(Prim_A_Elmt
);
10430 -- There is no need to handle interface primitives because their
10431 -- primitives are not hidden
10433 exit when Present
(Interface_Alias
(Prim_G
));
10435 -- Here we install one hidden primitive
10437 if Chars
(Prim_G
) /= Chars
(Prim_A
)
10438 and then Has_Suffix
(Prim_A
, 'P')
10439 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
10441 Set_Chars
(Prim_A
, Chars
(Prim_G
));
10442 Append_New_Elmt
(Prim_A
, To
=> List
);
10445 Next_Elmt
(Prim_A_Elmt
);
10446 Next_Elmt
(Prim_G_Elmt
);
10449 -- Append the elements to the list of temporarily visible primitives
10450 -- avoiding duplicates.
10452 if Present
(List
) then
10453 if No
(Prims_List
) then
10454 Prims_List
:= New_Elmt_List
;
10457 Elmt
:= First_Elmt
(List
);
10458 while Present
(Elmt
) loop
10459 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
10463 end Install_Hidden_Primitives
;
10465 -------------------------------
10466 -- Restore_Hidden_Primitives --
10467 -------------------------------
10469 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
10470 Prim_Elmt
: Elmt_Id
;
10474 if Present
(Prims_List
) then
10475 Prim_Elmt
:= First_Elmt
(Prims_List
);
10476 while Present
(Prim_Elmt
) loop
10477 Prim
:= Node
(Prim_Elmt
);
10478 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
10479 Next_Elmt
(Prim_Elmt
);
10482 Prims_List
:= No_Elist
;
10484 end Restore_Hidden_Primitives
;
10486 --------------------------------
10487 -- Instantiate_Formal_Package --
10488 --------------------------------
10490 function Instantiate_Formal_Package
10493 Analyzed_Formal
: Node_Id
) return List_Id
10495 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10496 Hidden_Formals
: constant Elist_Id
:= New_Elmt_List
;
10498 Actual_Pack
: Entity_Id
;
10499 Formal_Pack
: Entity_Id
;
10500 Gen_Parent
: Entity_Id
;
10503 Parent_Spec
: Node_Id
;
10505 procedure Find_Matching_Actual
10507 Act
: in out Entity_Id
);
10508 -- We need to associate each formal entity in the formal package with
10509 -- the corresponding entity in the actual package. The actual package
10510 -- has been analyzed and possibly expanded, and as a result there is
10511 -- no one-to-one correspondence between the two lists (for example,
10512 -- the actual may include subtypes, itypes, and inherited primitive
10513 -- operations, interspersed among the renaming declarations for the
10514 -- actuals). We retrieve the corresponding actual by name because each
10515 -- actual has the same name as the formal, and they do appear in the
10518 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
10519 -- Retrieve entity of defining entity of generic formal parameter.
10520 -- Only the declarations of formals need to be considered when
10521 -- linking them to actuals, but the declarative list may include
10522 -- internal entities generated during analysis, and those are ignored.
10524 procedure Match_Formal_Entity
10525 (Formal_Node
: Node_Id
;
10526 Formal_Ent
: Entity_Id
;
10527 Actual_Ent
: Entity_Id
);
10528 -- Associates the formal entity with the actual. In the case where
10529 -- Formal_Ent is a formal package, this procedure iterates through all
10530 -- of its formals and enters associations between the actuals occurring
10531 -- in the formal package's corresponding actual package (given by
10532 -- Actual_Ent) and the formal package's formal parameters. This
10533 -- procedure recurses if any of the parameters is itself a package.
10535 function Is_Instance_Of
10536 (Act_Spec
: Entity_Id
;
10537 Gen_Anc
: Entity_Id
) return Boolean;
10538 -- The actual can be an instantiation of a generic within another
10539 -- instance, in which case there is no direct link from it to the
10540 -- original generic ancestor. In that case, we recognize that the
10541 -- ultimate ancestor is the same by examining names and scopes.
10543 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
10544 -- If the current formal is declared with a box, its own formals are
10545 -- visible in the instance, as they were in the generic, and their
10546 -- Hidden flag must be reset. If some of these formals are themselves
10547 -- packages declared with a box, the processing must be recursive.
10549 --------------------------
10550 -- Find_Matching_Actual --
10551 --------------------------
10553 procedure Find_Matching_Actual
10555 Act
: in out Entity_Id
)
10557 Formal_Ent
: Entity_Id
;
10560 case Nkind
(Original_Node
(F
)) is
10561 when N_Formal_Object_Declaration
10562 | N_Formal_Type_Declaration
10564 Formal_Ent
:= Defining_Identifier
(F
);
10566 while Present
(Act
)
10567 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10572 when N_Formal_Package_Declaration
10573 | N_Formal_Subprogram_Declaration
10574 | N_Generic_Package_Declaration
10575 | N_Package_Declaration
10577 Formal_Ent
:= Defining_Entity
(F
);
10579 while Present
(Act
)
10580 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10586 raise Program_Error
;
10588 end Find_Matching_Actual
;
10590 -------------------------
10591 -- Match_Formal_Entity --
10592 -------------------------
10594 procedure Match_Formal_Entity
10595 (Formal_Node
: Node_Id
;
10596 Formal_Ent
: Entity_Id
;
10597 Actual_Ent
: Entity_Id
)
10599 Act_Pkg
: Entity_Id
;
10602 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
10604 if Ekind
(Actual_Ent
) = E_Package
then
10606 -- Record associations for each parameter
10608 Act_Pkg
:= Actual_Ent
;
10611 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
10615 Gen_Decl
: Node_Id
;
10617 Actual
: Entity_Id
;
10620 -- Retrieve the actual given in the formal package declaration
10622 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
10624 -- The actual in the formal package declaration may be a
10625 -- renamed generic package, in which case we want to retrieve
10626 -- the original generic in order to traverse its formal part.
10628 if Present
(Renamed_Entity
(Actual
)) then
10629 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
10631 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
10634 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
10636 if Present
(Formals
) then
10637 F_Node
:= First_Non_Pragma
(Formals
);
10642 while Present
(A_Ent
)
10643 and then Present
(F_Node
)
10644 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
10646 F_Ent
:= Get_Formal_Entity
(F_Node
);
10648 if Present
(F_Ent
) then
10650 -- This is a formal of the original package. Record
10651 -- association and recurse.
10653 Find_Matching_Actual
(F_Node
, A_Ent
);
10654 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
10655 Next_Entity
(A_Ent
);
10658 Next_Non_Pragma
(F_Node
);
10662 end Match_Formal_Entity
;
10664 -----------------------
10665 -- Get_Formal_Entity --
10666 -----------------------
10668 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
10669 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
10672 when N_Formal_Object_Declaration
=>
10673 return Defining_Identifier
(N
);
10675 when N_Formal_Type_Declaration
=>
10676 return Defining_Identifier
(N
);
10678 when N_Formal_Subprogram_Declaration
=>
10679 return Defining_Unit_Name
(Specification
(N
));
10681 when N_Formal_Package_Declaration
=>
10682 return Defining_Identifier
(Original_Node
(N
));
10684 when N_Generic_Package_Declaration
=>
10685 return Defining_Identifier
(Original_Node
(N
));
10687 -- All other declarations are introduced by semantic analysis and
10688 -- have no match in the actual.
10693 end Get_Formal_Entity
;
10695 --------------------
10696 -- Is_Instance_Of --
10697 --------------------
10699 function Is_Instance_Of
10700 (Act_Spec
: Entity_Id
;
10701 Gen_Anc
: Entity_Id
) return Boolean
10703 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
10706 if No
(Gen_Par
) then
10709 -- Simplest case: the generic parent of the actual is the formal
10711 elsif Gen_Par
= Gen_Anc
then
10714 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
10717 -- The actual may be obtained through several instantiations. Its
10718 -- scope must itself be an instance of a generic declared in the
10719 -- same scope as the formal. Any other case is detected above.
10721 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
10725 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
10727 end Is_Instance_Of
;
10729 ---------------------------
10730 -- Process_Nested_Formal --
10731 ---------------------------
10733 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
10737 if Present
(Associated_Formal_Package
(Formal
))
10738 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
10740 Ent
:= First_Entity
(Formal
);
10741 while Present
(Ent
) loop
10742 Set_Is_Hidden
(Ent
, False);
10743 Set_Is_Visible_Formal
(Ent
);
10744 Set_Is_Potentially_Use_Visible
10745 (Ent
, Is_Potentially_Use_Visible
(Formal
));
10747 if Ekind
(Ent
) = E_Package
then
10748 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10749 Process_Nested_Formal
(Ent
);
10755 end Process_Nested_Formal
;
10757 -- Start of processing for Instantiate_Formal_Package
10762 -- The actual must be a package instance, or else a current instance
10763 -- such as a parent generic within the body of a generic child.
10765 if not Is_Entity_Name
(Actual
)
10766 or else not Is_Package_Or_Generic_Package
(Entity
(Actual
))
10769 ("expect package instance to instantiate formal", Actual
);
10770 Abandon_Instantiation
(Actual
);
10773 Actual_Pack
:= Entity
(Actual
);
10774 Set_Is_Instantiated
(Actual_Pack
);
10776 -- The actual may be a renamed package, or an outer generic formal
10777 -- package whose instantiation is converted into a renaming.
10779 if Present
(Renamed_Entity
(Actual_Pack
)) then
10780 Actual_Pack
:= Renamed_Entity
(Actual_Pack
);
10783 -- The analyzed formal is expected to be the result of the rewriting
10784 -- of the formal package into a regular package by analysis.
10786 pragma Assert
(Nkind
(Analyzed_Formal
) = N_Package_Declaration
10787 and then Nkind
(Original_Node
(Analyzed_Formal
)) =
10788 N_Formal_Package_Declaration
);
10790 Gen_Parent
:= Generic_Parent
(Specification
(Analyzed_Formal
));
10791 Formal_Pack
:= Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10793 -- The actual for a ghost generic formal package should be a ghost
10794 -- package (SPARK RM 6.9(14)).
10796 Check_Ghost_Formal_Procedure_Or_Package
10798 Actual
=> Actual_Pack
,
10799 Formal
=> Formal_Pack
);
10801 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
10802 Parent_Spec
:= Package_Specification
(Actual_Pack
);
10804 Parent_Spec
:= Parent
(Actual_Pack
);
10807 if Gen_Parent
= Any_Id
then
10809 ("previous error in declaration of formal package", Actual
);
10810 Abandon_Instantiation
(Actual
);
10812 elsif Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
)) then
10815 -- If this is the current instance of an enclosing generic, that unit
10816 -- is the generic package we need.
10818 elsif In_Open_Scopes
(Actual_Pack
)
10819 and then Ekind
(Actual_Pack
) = E_Generic_Package
10825 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
10826 Abandon_Instantiation
(Actual
);
10829 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
10830 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
10833 Make_Package_Renaming_Declaration
(Loc
,
10834 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
10835 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
10837 Set_Associated_Formal_Package
10838 (Defining_Unit_Name
(Nod
), Defining_Identifier
(Formal
));
10839 Decls
:= New_List
(Nod
);
10841 -- If the formal F has a box, then the generic declarations are
10842 -- visible in the generic G. In an instance of G, the corresponding
10843 -- entities in the actual for F (which are the actuals for the
10844 -- instantiation of the generic that F denotes) must also be made
10845 -- visible for analysis of the current instance. On exit from the
10846 -- current instance, those entities are made private again. If the
10847 -- actual is currently in use, these entities are also use-visible.
10849 -- The loop through the actual entities also steps through the formal
10850 -- entities and enters associations from formals to actuals into the
10851 -- renaming map. This is necessary to properly handle checking of
10852 -- actual parameter associations for later formals that depend on
10853 -- actuals declared in the formal package.
10855 -- In Ada 2005, partial parameterization requires that we make
10856 -- visible the actuals corresponding to formals that were defaulted
10857 -- in the formal package. There formals are identified because they
10858 -- remain formal generics within the formal package, rather than
10859 -- being renamings of the actuals supplied.
10862 Gen_Decl
: constant Node_Id
:=
10863 Unit_Declaration_Node
(Gen_Parent
);
10864 Formals
: constant List_Id
:=
10865 Generic_Formal_Declarations
(Gen_Decl
);
10867 Actual_Ent
: Entity_Id
;
10868 Actual_Of_Formal
: Node_Id
;
10869 Formal_Node
: Node_Id
;
10870 Formal_Ent
: Entity_Id
;
10873 if Present
(Formals
) then
10874 Formal_Node
:= First_Non_Pragma
(Formals
);
10876 Formal_Node
:= Empty
;
10879 Actual_Ent
:= First_Entity
(Actual_Pack
);
10880 Actual_Of_Formal
:=
10881 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
10882 while Present
(Actual_Ent
)
10883 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10885 if Present
(Formal_Node
) then
10886 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
10888 if Present
(Formal_Ent
) then
10889 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
10890 Match_Formal_Entity
(Formal_Node
, Formal_Ent
, Actual_Ent
);
10892 -- We iterate at the same time over the actuals of the
10893 -- local package created for the formal, to determine
10894 -- which one of the formals of the original generic were
10895 -- defaulted in the formal. The corresponding actual
10896 -- entities are visible in the enclosing instance.
10898 if Box_Present
(Formal
)
10900 (Present
(Actual_Of_Formal
)
10903 (Get_Formal_Entity
(Actual_Of_Formal
)))
10905 Set_Is_Hidden
(Actual_Ent
, False);
10906 Set_Is_Visible_Formal
(Actual_Ent
);
10907 Set_Is_Potentially_Use_Visible
10908 (Actual_Ent
, In_Use
(Actual_Pack
));
10910 if Ekind
(Actual_Ent
) = E_Package
then
10911 Process_Nested_Formal
(Actual_Ent
);
10915 if not Is_Hidden
(Actual_Ent
) then
10916 Append_Elmt
(Actual_Ent
, Hidden_Formals
);
10919 Set_Is_Hidden
(Actual_Ent
);
10920 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
10924 Next_Non_Pragma
(Formal_Node
);
10925 Next
(Actual_Of_Formal
);
10927 -- A formal subprogram may be overloaded, so advance in
10928 -- the list of actuals to make sure we do not match two
10929 -- successive formals to the same actual. This is only
10930 -- relevant for overloadable entities, others have
10933 if Is_Overloadable
(Actual_Ent
) then
10934 Next_Entity
(Actual_Ent
);
10938 -- No further formals to match, but the generic part may
10939 -- contain inherited operation that are not hidden in the
10940 -- enclosing instance.
10942 Next_Entity
(Actual_Ent
);
10946 -- Inherited subprograms generated by formal derived types are
10947 -- also visible if the types are.
10949 Actual_Ent
:= First_Entity
(Actual_Pack
);
10950 while Present
(Actual_Ent
)
10951 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10953 if Is_Overloadable
(Actual_Ent
)
10955 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
10957 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
10959 Set_Is_Hidden
(Actual_Ent
, False);
10960 Set_Is_Potentially_Use_Visible
10961 (Actual_Ent
, In_Use
(Actual_Pack
));
10964 Next_Entity
(Actual_Ent
);
10968 -- If the formal requires conformance checking, reanalyze it as an
10969 -- abbreviated instantiation, to verify the matching rules of 12.7.
10970 -- The actual checks are performed after the generic associations
10971 -- have been analyzed, to guarantee the same visibility for this
10972 -- instantiation and for the actuals.
10974 -- In Ada 2005, the generic associations for the formal can include
10975 -- defaulted parameters. These are ignored during check. This
10976 -- internal instantiation is removed from the tree after conformance
10977 -- checking, because it contains formal declarations for those
10978 -- defaulted parameters, and those should not reach the back-end.
10980 if Requires_Conformance_Checking
(Formal
) then
10982 I_Pack
: constant Entity_Id
:= Make_Temporary
(Loc
, 'P');
10987 Set_Is_Internal
(I_Pack
);
10988 Mutate_Ekind
(I_Pack
, E_Package
);
10990 -- Insert the package into the list of its hidden entities so
10991 -- that the list is not empty for Is_Abbreviated_Instance.
10993 Append_Elmt
(I_Pack
, Hidden_Formals
);
10995 Set_Hidden_In_Formal_Instance
(I_Pack
, Hidden_Formals
);
10997 -- If the generic is a child unit, Check_Generic_Child_Unit
10998 -- needs its original name in case it is qualified.
11000 if Is_Child_Unit
(Gen_Parent
) then
11002 New_Copy_Tree
(Name
(Original_Node
(Analyzed_Formal
)));
11003 pragma Assert
(Entity
(I_Nam
) = Gen_Parent
);
11007 New_Occurrence_Of
(Get_Instance_Of
(Gen_Parent
), Loc
);
11011 Make_Package_Instantiation
(Loc
,
11012 Defining_Unit_Name
=> I_Pack
,
11014 Generic_Associations
=> Generic_Associations
(Formal
)));
11020 end Instantiate_Formal_Package
;
11022 -----------------------------------
11023 -- Instantiate_Formal_Subprogram --
11024 -----------------------------------
11026 function Instantiate_Formal_Subprogram
11029 Analyzed_Formal
: Node_Id
) return Node_Id
11031 Analyzed_S
: constant Entity_Id
:=
11032 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
11033 Formal_Sub
: constant Entity_Id
:=
11034 Defining_Unit_Name
(Specification
(Formal
));
11036 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
11037 -- If the generic is a child unit, the parent has been installed on the
11038 -- scope stack, but a default subprogram cannot resolve to something
11039 -- on the parent because that parent is not really part of the visible
11040 -- context (it is there to resolve explicit local entities). If the
11041 -- default has resolved in this way, we remove the entity from immediate
11042 -- visibility and analyze the node again to emit an error message or
11043 -- find another visible candidate.
11045 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
11046 -- Perform legality check and raise exception on failure
11048 -----------------------
11049 -- From_Parent_Scope --
11050 -----------------------
11052 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
11053 Gen_Scope
: Node_Id
;
11056 Gen_Scope
:= Scope
(Analyzed_S
);
11057 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
11058 if Scope
(Subp
) = Scope
(Gen_Scope
) then
11062 Gen_Scope
:= Scope
(Gen_Scope
);
11066 end From_Parent_Scope
;
11068 -----------------------------
11069 -- Valid_Actual_Subprogram --
11070 -----------------------------
11072 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
11076 if Is_Entity_Name
(Act
) then
11077 Act_E
:= Entity
(Act
);
11079 elsif Nkind
(Act
) = N_Selected_Component
11080 and then Is_Entity_Name
(Selector_Name
(Act
))
11082 Act_E
:= Entity
(Selector_Name
(Act
));
11088 -- The actual for a ghost generic formal procedure should be a ghost
11089 -- procedure (SPARK RM 6.9(14)).
11092 and then Ekind
(Act_E
) = E_Procedure
11094 Check_Ghost_Formal_Procedure_Or_Package
11097 Formal
=> Analyzed_S
);
11100 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
11101 or else Nkind
(Act
) in N_Attribute_Reference
11102 | N_Indexed_Component
11103 | N_Character_Literal
11104 | N_Explicit_Dereference
11110 ("expect subprogram or entry name in instantiation of &",
11111 Instantiation_Node
, Formal_Sub
);
11112 Abandon_Instantiation
(Instantiation_Node
);
11113 end Valid_Actual_Subprogram
;
11117 Decl_Node
: Node_Id
;
11120 New_Spec
: Node_Id
;
11121 New_Subp
: Entity_Id
;
11123 -- Start of processing for Instantiate_Formal_Subprogram
11126 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
11128 -- The tree copy has created the proper instantiation sloc for the
11129 -- new specification. Use this location for all other constructed
11132 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
11134 -- Create new entity for the actual (New_Copy_Tree does not), and
11135 -- indicate that it is an actual.
11137 -- If the actual is not an entity (i.e. an attribute reference)
11138 -- and the formal includes aspect specifications for contracts,
11139 -- we create an internal name for the renaming declaration. The
11140 -- constructed wrapper contains a call to the entity in the renaming.
11141 -- This is an expansion activity, as is the wrapper creation.
11143 if Ada_Version
>= Ada_2022
11144 and then Has_Contracts
(Analyzed_Formal
)
11145 and then not Is_Entity_Name
(Actual
)
11146 and then Expander_Active
11148 New_Subp
:= Make_Temporary
(Sloc
(Actual
), 'S');
11150 New_Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
));
11153 Mutate_Ekind
(New_Subp
, Ekind
(Analyzed_S
));
11154 Set_Is_Generic_Actual_Subprogram
(New_Subp
);
11155 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
11157 -- Create new entities for the each of the formals in the specification
11158 -- of the renaming declaration built for the actual.
11160 if Present
(Parameter_Specifications
(New_Spec
)) then
11166 F
:= First
(Parameter_Specifications
(New_Spec
));
11167 while Present
(F
) loop
11168 F_Id
:= Defining_Identifier
(F
);
11170 Set_Defining_Identifier
(F
,
11171 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
11177 -- Find entity of actual. If the actual is an attribute reference, it
11178 -- cannot be resolved here (its formal is missing) but is handled
11179 -- instead in Attribute_Renaming. If the actual is overloaded, it is
11180 -- fully resolved subsequently, when the renaming declaration for the
11181 -- formal is analyzed. If it is an explicit dereference, resolve the
11182 -- prefix but not the actual itself, to prevent interpretation as call.
11184 if Present
(Actual
) then
11185 Loc
:= Sloc
(Actual
);
11186 Set_Sloc
(New_Spec
, Loc
);
11188 if Nkind
(Actual
) = N_Operator_Symbol
then
11189 Find_Direct_Name
(Actual
);
11191 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
11192 Analyze
(Prefix
(Actual
));
11194 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
11198 Valid_Actual_Subprogram
(Actual
);
11201 elsif Present
(Default_Name
(Formal
)) then
11202 if Nkind
(Default_Name
(Formal
)) not in N_Attribute_Reference
11203 | N_Selected_Component
11204 | N_Indexed_Component
11205 | N_Character_Literal
11206 and then Present
(Entity
(Default_Name
(Formal
)))
11208 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
11210 Nam
:= New_Copy
(Default_Name
(Formal
));
11211 Set_Sloc
(Nam
, Loc
);
11214 elsif Box_Present
(Formal
) then
11216 -- Actual is resolved at the point of instantiation. Create an
11217 -- identifier or operator with the same name as the formal.
11219 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
11221 Make_Operator_Symbol
(Loc
,
11222 Chars
=> Chars
(Formal_Sub
),
11223 Strval
=> No_String
);
11225 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
11228 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
11229 and then Null_Present
(Specification
(Formal
))
11231 -- Generate null body for procedure, for use in the instance
11234 Make_Subprogram_Body
(Loc
,
11235 Specification
=> New_Spec
,
11236 Declarations
=> New_List
,
11237 Handled_Statement_Sequence
=>
11238 Make_Handled_Sequence_Of_Statements
(Loc
,
11239 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
11241 -- RM 12.6 (16.2/2): The procedure has convention Intrinsic
11243 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11245 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11247 -- Eliminate the calls to it when optimization is enabled
11249 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11252 -- Handle case of a formal function with an expression default (allowed
11253 -- when extensions are enabled).
11255 elsif Nkind
(Specification
(Formal
)) = N_Function_Specification
11256 and then Present
(Expression
(Formal
))
11258 -- Generate body for function, for use in the instance
11261 Expr
: constant Node_Id
:= New_Copy
(Expression
(Formal
));
11262 Stmt
: constant Node_Id
:= Make_Simple_Return_Statement
(Loc
);
11264 Set_Sloc
(Expr
, Loc
);
11265 Set_Expression
(Stmt
, Expr
);
11268 Make_Subprogram_Body
(Loc
,
11269 Specification
=> New_Spec
,
11270 Declarations
=> New_List
,
11271 Handled_Statement_Sequence
=>
11272 Make_Handled_Sequence_Of_Statements
(Loc
,
11273 Statements
=> New_List
(Stmt
)));
11276 -- RM 12.6 (16.2/2): Like a null procedure default, the function
11277 -- has convention Intrinsic.
11279 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11281 -- Inline calls to it when optimization is enabled
11283 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11287 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
11289 ("missing actual&", Instantiation_Node
, Formal_Sub
);
11291 ("\in instantiation of & declared#",
11292 Instantiation_Node
, Scope
(Analyzed_S
));
11293 Abandon_Instantiation
(Instantiation_Node
);
11297 Make_Subprogram_Renaming_Declaration
(Loc
,
11298 Specification
=> New_Spec
,
11301 -- If we do not have an actual and the formal specified <> then set to
11302 -- get proper default.
11304 if No
(Actual
) and then Box_Present
(Formal
) then
11305 Set_From_Default
(Decl_Node
);
11308 -- Gather possible interpretations for the actual before analyzing the
11309 -- instance. If overloaded, it will be resolved when analyzing the
11310 -- renaming declaration.
11312 if Box_Present
(Formal
) and then No
(Actual
) then
11315 if Is_Child_Unit
(Scope
(Analyzed_S
))
11316 and then Present
(Entity
(Nam
))
11318 if not Is_Overloaded
(Nam
) then
11319 if From_Parent_Scope
(Entity
(Nam
)) then
11320 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
11321 Set_Entity
(Nam
, Empty
);
11322 Set_Etype
(Nam
, Empty
);
11325 Set_Is_Immediately_Visible
(Entity
(Nam
));
11334 Get_First_Interp
(Nam
, I
, It
);
11335 while Present
(It
.Nam
) loop
11336 if From_Parent_Scope
(It
.Nam
) then
11340 Get_Next_Interp
(I
, It
);
11347 -- The generic instantiation freezes the actual. This can only be done
11348 -- once the actual is resolved, in the analysis of the renaming
11349 -- declaration. To make the formal subprogram entity available, we set
11350 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
11351 -- This is also needed in Analyze_Subprogram_Renaming for the processing
11352 -- of formal abstract subprograms.
11354 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
11356 -- We cannot analyze the renaming declaration, and thus find the actual,
11357 -- until all the actuals are assembled in the instance. For subsequent
11358 -- checks of other actuals, indicate the node that will hold the
11359 -- instance of this formal.
11361 Set_Instance_Of
(Analyzed_S
, Nam
);
11363 if Nkind
(Actual
) = N_Selected_Component
11364 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
11365 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
11367 -- The renaming declaration will create a body, which must appear
11368 -- outside of the instantiation, We move the renaming declaration
11369 -- out of the instance, and create an additional renaming inside,
11370 -- to prevent freezing anomalies.
11373 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
11376 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
11377 Insert_Before
(Instantiation_Node
, Decl_Node
);
11378 Analyze
(Decl_Node
);
11380 -- Now create renaming within the instance
11383 Make_Subprogram_Renaming_Declaration
(Loc
,
11384 Specification
=> New_Copy_Tree
(New_Spec
),
11385 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
11387 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
11388 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
11393 end Instantiate_Formal_Subprogram
;
11395 ------------------------
11396 -- Instantiate_Object --
11397 ------------------------
11399 function Instantiate_Object
11402 Analyzed_Formal
: Node_Id
) return List_Id
11404 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11405 A_Gen_Obj
: constant Entity_Id
:=
11406 Defining_Identifier
(Analyzed_Formal
);
11407 Acc_Def
: Node_Id
:= Empty
;
11408 Act_Assoc
: constant Node_Id
:=
11409 (if No
(Actual
) then Empty
else Parent
(Actual
));
11410 Actual_Decl
: Node_Id
:= Empty
;
11411 Decl_Node
: Node_Id
;
11414 List
: constant List_Id
:= New_List
;
11415 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
11416 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11417 Subt_Decl
: Node_Id
:= Empty
;
11418 Subt_Mark
: Node_Id
:= Empty
;
11420 -- Start of processing for Instantiate_Object
11423 -- Formal may be an anonymous access
11425 if Present
(Subtype_Mark
(Formal
)) then
11426 Subt_Mark
:= Subtype_Mark
(Formal
);
11428 Check_Access_Definition
(Formal
);
11429 Acc_Def
:= Access_Definition
(Formal
);
11432 -- Sloc for error message on missing actual
11434 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
11436 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
11437 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
11440 Set_Parent
(List
, Act_Assoc
);
11444 if Out_Present
(Formal
) then
11446 -- An IN OUT generic actual must be a name. The instantiation is a
11447 -- renaming declaration. The actual is the name being renamed. We
11448 -- use the actual directly, rather than a copy, because it is not
11449 -- used further in the list of actuals, and because a copy or a use
11450 -- of relocate_node is incorrect if the instance is nested within a
11451 -- generic. In order to simplify e.g. ASIS queries, the
11452 -- Generic_Parent field links the declaration to the generic
11455 if No
(Actual
) then
11457 ("missing actual &",
11458 Instantiation_Node
, Gen_Obj
);
11460 ("\in instantiation of & declared#",
11461 Instantiation_Node
, Scope
(A_Gen_Obj
));
11462 Abandon_Instantiation
(Instantiation_Node
);
11465 if Present
(Subt_Mark
) then
11467 Make_Object_Renaming_Declaration
(Loc
,
11468 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11469 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
11472 else pragma Assert
(Present
(Acc_Def
));
11474 Make_Object_Renaming_Declaration
(Loc
,
11475 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11476 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
11480 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11482 -- The analysis of the actual may produce Insert_Action nodes, so
11483 -- the declaration must have a context in which to attach them.
11485 Append
(Decl_Node
, List
);
11488 -- Return if the analysis of the actual reported some error
11490 if Etype
(Actual
) = Any_Type
then
11494 -- This check is performed here because Analyze_Object_Renaming will
11495 -- not check it when Comes_From_Source is False. Note though that the
11496 -- check for the actual being the name of an object will be performed
11497 -- in Analyze_Object_Renaming.
11499 if Is_Object_Reference
(Actual
)
11500 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
11503 ("illegal discriminant-dependent component for in out parameter",
11507 -- The actual has to be resolved in order to check that it is a
11508 -- variable (due to cases such as F (1), where F returns access to
11509 -- an array, and for overloaded prefixes).
11511 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
11513 -- If the type of the formal is not itself a formal, and the current
11514 -- unit is a child unit, the formal type must be declared in a
11515 -- parent, and must be retrieved by visibility.
11517 if Ftyp
= Orig_Ftyp
11518 and then Is_Generic_Unit
(Scope
(Ftyp
))
11519 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
11522 Temp
: constant Node_Id
:=
11523 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
11525 Set_Entity
(Temp
, Empty
);
11527 Ftyp
:= Entity
(Temp
);
11531 if Is_Private_Type
(Ftyp
)
11532 and then not Is_Private_Type
(Etype
(Actual
))
11533 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
11534 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
11536 -- If the actual has the type of the full view of the formal, or
11537 -- else a non-private subtype of the formal, then the visibility
11538 -- of the formal type has changed. Add to the actuals a subtype
11539 -- declaration that will force the exchange of views in the body
11540 -- of the instance as well.
11543 Make_Subtype_Declaration
(Loc
,
11544 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
11545 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
11547 Prepend
(Subt_Decl
, List
);
11549 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
11550 Exchange_Declarations
(Ftyp
);
11553 Resolve
(Actual
, Ftyp
);
11555 if not Denotes_Variable
(Actual
) then
11556 Error_Msg_NE
("actual for& must be a variable", Actual
, Gen_Obj
);
11558 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
11560 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
11561 -- the type of the actual shall resolve to a specific anonymous
11564 if Ada_Version
< Ada_2005
11565 or else not Is_Anonymous_Access_Type
(Base_Type
(Ftyp
))
11566 or else not Is_Anonymous_Access_Type
(Base_Type
(Etype
(Actual
)))
11569 ("type of actual does not match type of&", Actual
, Gen_Obj
);
11573 Note_Possible_Modification
(Actual
, Sure
=> True);
11575 -- Check for instantiation with atomic/volatile/VFA object actual for
11576 -- nonatomic/nonvolatile/nonVFA formal (RM C.6 (12)).
11578 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
11580 ("cannot instantiate nonatomic formal & of mode in out",
11582 Error_Msg_N
("\with atomic object actual (RM C.6(12))", Actual
);
11584 elsif Is_Volatile_Object_Ref
(Actual
)
11585 and then not Is_Volatile
(Orig_Ftyp
)
11588 ("cannot instantiate nonvolatile formal & of mode in out",
11590 Error_Msg_N
("\with volatile object actual (RM C.6(12))", Actual
);
11592 elsif Is_Volatile_Full_Access_Object_Ref
(Actual
)
11593 and then not Is_Volatile_Full_Access
(Orig_Ftyp
)
11596 ("cannot instantiate nonfull access formal & of mode in out",
11599 ("\with full access object actual (RM C.6(12))", Actual
);
11602 -- Check for instantiation on nonatomic subcomponent of a full access
11603 -- object in Ada 2022 (RM C.6 (12)).
11605 if Ada_Version
>= Ada_2022
11606 and then Is_Subcomponent_Of_Full_Access_Object
(Actual
)
11607 and then not Is_Atomic_Object
(Actual
)
11610 ("cannot instantiate formal & of mode in out with actual",
11613 ("\nonatomic subcomponent of full access object (RM C.6(12))",
11617 -- The actual for a ghost generic formal IN OUT parameter should be a
11618 -- ghost object (SPARK RM 6.9(14)).
11620 Check_Ghost_Formal_Variable
11622 Formal
=> A_Gen_Obj
);
11624 -- Formal in-parameter
11627 -- The instantiation of a generic formal in-parameter is constant
11628 -- declaration. The actual is the expression for that declaration.
11629 -- Its type is a full copy of the type of the formal. This may be
11630 -- an access to subprogram, for which we need to generate entities
11631 -- for the formals in the new signature.
11633 if Present
(Actual
) then
11634 if Present
(Subt_Mark
) then
11635 Def
:= New_Copy_Tree
(Subt_Mark
);
11637 pragma Assert
(Present
(Acc_Def
));
11638 Def
:= New_Copy_Tree
(Acc_Def
);
11642 Make_Object_Declaration
(Loc
,
11643 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11644 Constant_Present
=> True,
11645 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11646 Object_Definition
=> Def
,
11647 Expression
=> Actual
);
11649 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11650 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11652 -- A generic formal object of a tagged type is defined to be
11653 -- aliased so the new constant must also be treated as aliased.
11655 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
11656 Set_Aliased_Present
(Decl_Node
);
11659 Append
(Decl_Node
, List
);
11661 -- The actual for a ghost generic formal IN parameter of
11662 -- access-to-variable type should be a ghost object (SPARK
11665 if Is_Access_Variable
(Etype
(A_Gen_Obj
)) then
11666 Check_Ghost_Formal_Variable
11668 Formal
=> A_Gen_Obj
);
11671 -- No need to repeat (pre-)analysis of some expression nodes
11672 -- already handled in Preanalyze_Actuals.
11674 if Nkind
(Actual
) /= N_Allocator
then
11677 -- Return if the analysis of the actual reported some error
11679 if Etype
(Actual
) = Any_Type
then
11685 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11689 Typ
:= Get_Instance_Of
(Formal_Type
);
11691 -- If the actual appears in the current or an enclosing scope,
11692 -- use its type directly. This is relevant if it has an actual
11693 -- subtype that is distinct from its nominal one. This cannot
11694 -- be done in general because the type of the actual may
11695 -- depend on other actuals, and only be fully determined when
11696 -- the enclosing instance is analyzed.
11698 if Present
(Etype
(Actual
))
11699 and then Is_Constr_Subt_For_U_Nominal
(Etype
(Actual
))
11701 Freeze_Before
(Instantiation_Node
, Etype
(Actual
));
11703 Freeze_Before
(Instantiation_Node
, Typ
);
11706 -- If the actual is an aggregate, perform name resolution on
11707 -- its components (the analysis of an aggregate does not do it)
11708 -- to capture local names that may be hidden if the generic is
11711 if Nkind
(Actual
) = N_Aggregate
then
11712 Preanalyze_And_Resolve
(Actual
, Typ
);
11715 if Is_Limited_Type
(Typ
)
11716 and then not OK_For_Limited_Init
(Typ
, Actual
)
11719 ("initialization not allowed for limited types", Actual
);
11720 Explain_Limited_Type
(Typ
, Actual
);
11724 elsif Present
(Default_Expression
(Formal
)) then
11726 -- Use default to construct declaration
11728 if Present
(Subt_Mark
) then
11729 Def
:= New_Copy_Tree
(Subt_Mark
);
11731 pragma Assert
(Present
(Acc_Def
));
11732 Def
:= New_Copy_Tree
(Acc_Def
);
11736 Make_Object_Declaration
(Sloc
(Formal
),
11737 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11738 Constant_Present
=> True,
11739 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11740 Object_Definition
=> Def
,
11741 Expression
=> New_Copy_Tree
11742 (Default_Expression
(Formal
)));
11744 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11745 Set_Corresponding_Generic_Association
11746 (Decl_Node
, Expression
(Decl_Node
));
11748 Append
(Decl_Node
, List
);
11749 Set_Analyzed
(Expression
(Decl_Node
), False);
11752 Error_Msg_NE
("missing actual&", Instantiation_Node
, Gen_Obj
);
11753 Error_Msg_NE
("\in instantiation of & declared#",
11754 Instantiation_Node
, Scope
(A_Gen_Obj
));
11756 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
11758 -- Create dummy constant declaration so that instance can be
11759 -- analyzed, to minimize cascaded visibility errors.
11761 if Present
(Subt_Mark
) then
11763 else pragma Assert
(Present
(Acc_Def
));
11768 Make_Object_Declaration
(Loc
,
11769 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11770 Constant_Present
=> True,
11771 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11772 Object_Definition
=> New_Copy
(Def
),
11774 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
11775 Attribute_Name
=> Name_First
,
11776 Prefix
=> New_Copy
(Def
)));
11778 Append
(Decl_Node
, List
);
11781 Abandon_Instantiation
(Instantiation_Node
);
11786 if Nkind
(Actual
) in N_Has_Entity
11787 and then Present
(Entity
(Actual
))
11789 Actual_Decl
:= Parent
(Entity
(Actual
));
11792 -- Ada 2005 (AI-423) refined by AI12-0287:
11793 -- For an object_renaming_declaration with a null_exclusion or an
11794 -- access_definition that has a null_exclusion, the subtype of the
11795 -- object_name shall exclude null. In addition, if the
11796 -- object_renaming_declaration occurs within the body of a generic unit
11797 -- G or within the body of a generic unit declared within the
11798 -- declarative region of generic unit G, then:
11799 -- * if the object_name statically denotes a generic formal object of
11800 -- mode in out of G, then the declaration of that object shall have a
11802 -- * if the object_name statically denotes a call of a generic formal
11803 -- function of G, then the declaration of the result of that function
11804 -- shall have a null_exclusion.
11806 if Ada_Version
>= Ada_2005
11807 and then Present
(Actual_Decl
)
11808 and then Nkind
(Actual_Decl
) in N_Formal_Object_Declaration
11809 | N_Object_Declaration
11810 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
11811 and then not Has_Null_Exclusion
(Actual_Decl
)
11812 and then Has_Null_Exclusion
(Analyzed_Formal
)
11813 and then Ekind
(Defining_Identifier
(Analyzed_Formal
))
11814 = E_Generic_In_Out_Parameter
11815 and then ((In_Generic_Scope
(Entity
(Actual
))
11816 and then In_Package_Body
(Scope
(Entity
(Actual
))))
11817 or else not Can_Never_Be_Null
(Etype
(Actual
)))
11819 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
11821 ("actual must exclude null to match generic formal#", Actual
);
11825 end Instantiate_Object
;
11827 ------------------------------
11828 -- Instantiate_Package_Body --
11829 ------------------------------
11831 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11832 -- must be replaced by gotos which jump to the end of the routine in order
11833 -- to restore the Ghost and SPARK modes.
11835 procedure Instantiate_Package_Body
11836 (Body_Info
: Pending_Body_Info
;
11837 Inlined_Body
: Boolean := False;
11838 Body_Optional
: Boolean := False)
11840 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11841 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11842 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
11843 Ctx_Parents
: Elist_Id
:= No_Elist
;
11844 Ctx_Top
: Int
:= 0;
11845 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11846 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11847 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11848 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11849 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11851 procedure Check_Initialized_Types
;
11852 -- In a generic package body, an entity of a generic private type may
11853 -- appear uninitialized. This is suspicious, unless the actual is a
11854 -- fully initialized type.
11856 procedure Install_Parents_Of_Generic_Context
11857 (Inst_Scope
: Entity_Id
;
11858 Ctx_Parents
: out Elist_Id
);
11859 -- Inst_Scope is the scope where the instance appears within; when it
11860 -- appears within a generic child package G, this routine collects and
11861 -- installs the enclosing packages of G in the scopes stack; installed
11862 -- packages are returned in Ctx_Parents.
11864 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
);
11865 -- Reverse effect after instantiation is complete
11867 -----------------------------
11868 -- Check_Initialized_Types --
11869 -----------------------------
11871 procedure Check_Initialized_Types
is
11873 Formal
: Entity_Id
;
11874 Actual
: Entity_Id
;
11875 Uninit_Var
: Entity_Id
;
11878 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
11879 while Present
(Decl
) loop
11880 Uninit_Var
:= Empty
;
11882 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
11883 Uninit_Var
:= Uninitialized_Variable
(Decl
);
11885 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
11886 and then Nkind
(Formal_Type_Definition
(Decl
)) =
11887 N_Formal_Private_Type_Definition
11890 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
11893 if Present
(Uninit_Var
) then
11894 Formal
:= Defining_Identifier
(Decl
);
11895 Actual
:= First_Entity
(Act_Decl_Id
);
11897 -- For each formal there is a subtype declaration that renames
11898 -- the actual and has the same name as the formal. Locate the
11899 -- formal for warning message about uninitialized variables
11900 -- in the generic, for which the actual type should be a fully
11901 -- initialized type.
11903 while Present
(Actual
) loop
11904 exit when Ekind
(Actual
) = E_Package
11905 and then Present
(Renamed_Entity
(Actual
));
11907 if Chars
(Actual
) = Chars
(Formal
)
11908 and then not Is_Scalar_Type
(Actual
)
11909 and then not Is_Fully_Initialized_Type
(Actual
)
11910 and then Warn_On_No_Value_Assigned
11912 Error_Msg_Node_2
:= Formal
;
11914 ("generic unit has uninitialized variable& of "
11915 & "formal private type &?v?", Actual
, Uninit_Var
);
11917 ("actual type for& should be fully initialized type?v?",
11922 Next_Entity
(Actual
);
11928 end Check_Initialized_Types
;
11930 ----------------------------------------
11931 -- Install_Parents_Of_Generic_Context --
11932 ----------------------------------------
11934 procedure Install_Parents_Of_Generic_Context
11935 (Inst_Scope
: Entity_Id
;
11936 Ctx_Parents
: out Elist_Id
)
11942 Ctx_Parents
:= New_Elmt_List
;
11944 -- Collect context parents (ie. parents where the instantiation
11945 -- appears within).
11948 while S
/= Standard_Standard
loop
11949 Prepend_Elmt
(S
, Ctx_Parents
);
11953 -- Install enclosing parents
11955 Elmt
:= First_Elmt
(Ctx_Parents
);
11956 while Present
(Elmt
) loop
11957 Push_Scope
(Node
(Elmt
));
11958 Set_Is_Immediately_Visible
(Node
(Elmt
));
11961 end Install_Parents_Of_Generic_Context
;
11963 ---------------------------------------
11964 -- Remove_Parents_Of_Generic_Context --
11965 ---------------------------------------
11967 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
) is
11971 -- Traverse Ctx_Parents in LIFO order to check the removed scopes
11973 Elmt
:= Last_Elmt
(Ctx_Parents
);
11974 while Present
(Elmt
) loop
11975 pragma Assert
(Current_Scope
= Node
(Elmt
));
11976 Set_Is_Immediately_Visible
(Current_Scope
, False);
11979 Remove_Last_Elmt
(Ctx_Parents
);
11980 Elmt
:= Last_Elmt
(Ctx_Parents
);
11982 end Remove_Parents_Of_Generic_Context
;
11986 -- The following constants capture the context prior to instantiating
11987 -- the package body.
11989 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
11990 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11991 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
11992 Saved_ISMP
: constant Boolean :=
11993 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11994 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
11995 Local_Suppress_Stack_Top
;
11996 Saved_SC
: constant Boolean := Style_Check
;
11997 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11998 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11999 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
12000 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
12002 Act_Body
: Node_Id
;
12003 Act_Body_Id
: Entity_Id
;
12004 Act_Body_Name
: Node_Id
;
12005 Gen_Body
: Node_Id
;
12006 Gen_Body_Id
: Node_Id
;
12007 Par_Ent
: Entity_Id
:= Empty
;
12008 Par_Installed
: Boolean := False;
12009 Par_Vis
: Boolean := False;
12011 Scope_Check_Id
: Entity_Id
;
12012 Scope_Check_Last
: Nat
;
12013 -- Value of Current_Scope before calls to Install_Parents; used to check
12014 -- that scopes are correctly removed after instantiation.
12016 Vis_Prims_List
: Elist_Id
:= No_Elist
;
12017 -- List of primitives made temporarily visible in the instantiation
12018 -- to match the visibility of the formal type.
12020 -- Start of processing for Instantiate_Package_Body
12023 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12025 -- The instance body may already have been processed, as the parent of
12026 -- another instance that is inlined (Load_Parent_Of_Generic).
12028 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12032 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
12034 -- Re-establish the state of information on which checks are suppressed.
12035 -- This information was set in Body_Info at the point of instantiation,
12036 -- and now we restore it so that the instance is compiled using the
12037 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
12039 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
12040 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
12042 Restore_Config_Switches
(Body_Info
.Config_Switches
);
12043 Restore_Warnings
(Body_Info
.Warnings
);
12045 if No
(Gen_Body_Id
) then
12047 -- Do not look for parent of generic body if none is required.
12048 -- This may happen when the routine is called as part of the
12049 -- Pending_Instantiations processing, when nested instances
12050 -- may precede the one generated from the main unit.
12052 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
12053 and then Body_Optional
12057 Load_Parent_Of_Generic
12058 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
12060 -- Surprisingly enough, loading the body of the parent can cause
12061 -- the body to be instantiated and the double instantiation needs
12062 -- to be prevented in order to avoid giving bogus semantic errors.
12064 -- This case can occur because of the Collect_Previous_Instances
12065 -- machinery of Load_Parent_Of_Generic, which will instantiate
12066 -- bodies that are deemed to be ahead of the body of the parent
12067 -- in the compilation unit. But the relative position of these
12068 -- bodies is computed using the mere comparison of their Sloc.
12070 -- Now suppose that you have two generic packages G and H, with
12071 -- G containing a mere instantiation of H:
12077 -- package Nested_G is
12088 -- package My_H is new H;
12092 -- and a third package Q instantiating G and Nested_G:
12098 -- package My_G is new G;
12100 -- package My_Nested_G is new My_G.My_H.Nested_G;
12104 -- The body to be instantiated is that of My_Nested_G and its
12105 -- parent is the instance My_G.My_H. This latter instantiation
12106 -- is done when My_G is analyzed, i.e. after the declarations
12107 -- of My_G and My_Nested_G have been parsed; as a result, the
12108 -- Sloc of My_G.My_H is greater than the Sloc of My_Nested_G.
12110 -- Therefore loading the body of My_G.My_H will cause the body
12111 -- of My_Nested_G to be instantiated because it is deemed to be
12112 -- ahead of My_G.My_H. This means that Load_Parent_Of_Generic
12113 -- will again be invoked on My_G.My_H, but this time with the
12114 -- Collect_Previous_Instances machinery disabled, so there is
12115 -- no endless mutual recursion and things are done in order.
12117 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12121 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12125 -- Establish global variable for sloc adjustment and for error recovery
12126 -- In the case of an instance body for an instantiation with actuals
12127 -- from a limited view, the instance body is placed at the beginning
12128 -- of the enclosing package body: use the body entity as the source
12129 -- location for nodes of the instance body.
12131 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
)) then
12133 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12134 Body_Id
: constant Node_Id
:=
12135 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12138 Instantiation_Node
:= Body_Id
;
12141 Instantiation_Node
:= Inst_Node
;
12144 -- The package being instantiated may be subject to pragma Ghost. Set
12145 -- the mode now to ensure that any nodes generated during instantiation
12146 -- are properly marked as Ghost.
12148 Set_Ghost_Mode
(Act_Decl_Id
);
12150 if Present
(Gen_Body_Id
) then
12151 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12152 Style_Check
:= False;
12154 -- If the context of the instance is subject to SPARK_Mode "off", the
12155 -- annotation is missing, or the body is instantiated at a later pass
12156 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12157 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12160 if SPARK_Mode
/= On
12161 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12163 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12166 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12167 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12169 Create_Instantiation_Source
12170 (Inst_Node
, Gen_Body_Id
, S_Adjustment
);
12174 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12176 -- Create proper (possibly qualified) defining name for the body, to
12177 -- correspond to the one in the spec.
12180 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12181 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12183 -- Some attributes of spec entity are not inherited by body entity
12185 Set_Handler_Records
(Act_Body_Id
, No_List
);
12187 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12188 N_Defining_Program_Unit_Name
12191 Make_Defining_Program_Unit_Name
(Loc
,
12193 New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
12194 Defining_Identifier
=> Act_Body_Id
);
12196 Act_Body_Name
:= Act_Body_Id
;
12199 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
12201 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12202 Check_Generic_Actuals
(Act_Decl_Id
, False);
12203 Check_Initialized_Types
;
12205 -- Install primitives hidden at the point of the instantiation but
12206 -- visible when processing the generic formals
12212 E
:= First_Entity
(Act_Decl_Id
);
12213 while Present
(E
) loop
12215 and then not Is_Itype
(E
)
12216 and then Is_Generic_Actual_Type
(E
)
12217 and then Is_Tagged_Type
(E
)
12219 Install_Hidden_Primitives
12220 (Prims_List
=> Vis_Prims_List
,
12221 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
12229 Scope_Check_Id
:= Current_Scope
;
12230 Scope_Check_Last
:= Scope_Stack
.Last
;
12232 -- If the instantiation appears within a generic child some actual
12233 -- parameter may be the current instance of the enclosing generic
12237 Inst_Scope
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12240 if Is_Child_Unit
(Inst_Scope
)
12241 and then Ekind
(Inst_Scope
) = E_Generic_Package
12242 and then Present
(Generic_Associations
(Inst_Node
))
12244 Install_Parents_Of_Generic_Context
(Inst_Scope
, Ctx_Parents
);
12246 -- Hide them from visibility; required to avoid conflicts
12247 -- installing the parent instance.
12249 if Present
(Ctx_Parents
) then
12250 Push_Scope
(Standard_Standard
);
12251 Ctx_Top
:= Scope_Stack
.Last
;
12252 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12257 -- If it is a child unit, make the parent instance (which is an
12258 -- instance of the parent of the generic) visible.
12260 -- 1) The child unit's parent is an explicit parent instance (the
12261 -- prefix of the name of the generic unit):
12263 -- package Child_Package is new Parent_Instance.Child_Unit;
12265 -- 2) The child unit's parent is an implicit parent instance (e.g.
12266 -- when instantiating a sibling package):
12269 -- package Parent.Second_Child is
12273 -- package Parent.First_Child is
12274 -- package Sibling_Package is new Second_Child;
12276 -- 3) The child unit's parent is not an instance, so the scope is
12277 -- simply the one of the unit.
12279 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12280 and then Nkind
(Gen_Id
) = N_Expanded_Name
12282 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12284 elsif Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12285 and then Ekind
(Scope
(Act_Decl_Id
)) = E_Package
12286 and then Is_Generic_Instance
(Scope
(Act_Decl_Id
))
12288 (Name
(Get_Unit_Instantiation_Node
12289 (Scope
(Act_Decl_Id
)))) = N_Expanded_Name
12292 (Prefix
(Name
(Get_Unit_Instantiation_Node
12293 (Scope
(Act_Decl_Id
)))));
12295 elsif Is_Child_Unit
(Gen_Unit
) then
12296 Par_Ent
:= Scope
(Gen_Unit
);
12299 if Present
(Par_Ent
) then
12300 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12301 Install_Parent
(Par_Ent
, In_Body
=> True);
12302 Par_Installed
:= True;
12305 -- If the instantiation is a library unit, and this is the main unit,
12306 -- then build the resulting compilation unit nodes for the instance.
12307 -- If this is a compilation unit but it is not the main unit, then it
12308 -- is the body of a unit in the context, that is being compiled
12309 -- because it is encloses some inlined unit or another generic unit
12310 -- being instantiated. In that case, this body is not part of the
12311 -- current compilation, and is not attached to the tree, but its
12312 -- parent must be set for analysis.
12314 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12316 -- Replace instance node with body of instance, and create new
12317 -- node for corresponding instance declaration.
12319 Build_Instance_Compilation_Unit_Nodes
12320 (Inst_Node
, Act_Body
, Act_Decl
);
12322 -- If the instantiation appears within a generic child package
12323 -- enable visibility of current instance of enclosing generic
12326 if Present
(Ctx_Parents
) then
12327 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12328 Analyze
(Inst_Node
);
12329 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12331 Analyze
(Inst_Node
);
12334 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12336 -- If the instance is a child unit itself, then set the scope
12337 -- of the expanded body to be the parent of the instantiation
12338 -- (ensuring that the fully qualified name will be generated
12339 -- for the elaboration subprogram).
12341 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12342 N_Defining_Program_Unit_Name
12344 Set_Scope
(Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
12348 -- Case where instantiation is not a library unit
12351 -- Handle the case of an instance with incomplete actual types.
12352 -- The instance body cannot be placed just after the declaration
12353 -- because full views have not been seen yet. Any use of the non-
12354 -- limited views in the instance body requires the presence of a
12355 -- regular with_clause in the enclosing unit. Therefore we place
12356 -- the instance body at the beginning of the enclosing body, and
12357 -- the freeze node for the instance is then placed after the body.
12359 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
))
12360 and then Ekind
(Scope
(Act_Decl_Id
)) = E_Package
12363 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12364 Body_Id
: constant Node_Id
:=
12365 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12370 pragma Assert
(Present
(Body_Id
));
12372 Prepend
(Act_Body
, Declarations
(Parent
(Body_Id
)));
12374 if Expander_Active
then
12375 Ensure_Freeze_Node
(Act_Decl_Id
);
12376 F_Node
:= Freeze_Node
(Act_Decl_Id
);
12377 Set_Is_Frozen
(Act_Decl_Id
, False);
12378 if Is_List_Member
(F_Node
) then
12382 Insert_After
(Act_Body
, F_Node
);
12387 Insert_Before
(Inst_Node
, Act_Body
);
12388 Mark_Rewrite_Insertion
(Act_Body
);
12390 -- Insert the freeze node for the instance if need be
12392 if Expander_Active
then
12393 Freeze_Package_Instance
12394 (Inst_Node
, Gen_Body
, Gen_Decl
, Act_Decl_Id
);
12395 Set_Is_Frozen
(Act_Decl_Id
);
12399 -- If the instantiation appears within a generic child package
12400 -- enable visibility of current instance of enclosing generic
12403 if Present
(Ctx_Parents
) then
12404 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12405 Analyze
(Act_Body
);
12406 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12408 Analyze
(Act_Body
);
12412 Inherit_Context
(Gen_Body
, Inst_Node
);
12414 if Par_Installed
then
12415 Remove_Parent
(In_Body
=> True);
12417 -- Restore the previous visibility of the parent
12419 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12422 -- Remove the parent instances if they have been placed on the scope
12423 -- stack to compile the body.
12425 if Present
(Ctx_Parents
) then
12426 pragma Assert
(Scope_Stack
.Last
= Ctx_Top
12427 and then Current_Scope
= Standard_Standard
);
12430 Remove_Parents_Of_Generic_Context
(Ctx_Parents
);
12433 pragma Assert
(Current_Scope
= Scope_Check_Id
);
12434 pragma Assert
(Scope_Stack
.Last
= Scope_Check_Last
);
12436 Restore_Hidden_Primitives
(Vis_Prims_List
);
12438 -- Restore the private views that were made visible when the body of
12439 -- the instantiation was created. Note that, in the case where one of
12440 -- these private views is declared in the parent, there is a nesting
12441 -- issue with the calls to Install_Parent and Remove_Parent made in
12442 -- between above with In_Body set to True, because these calls also
12443 -- want to swap and restore this private view respectively. In this
12444 -- case, the call to Install_Parent does nothing, but the call to
12445 -- Remove_Parent does restore the private view, thus undercutting the
12446 -- call to Restore_Private_Views. That's OK under the condition that
12447 -- the two mechanisms swap exactly the same entities, in particular
12448 -- the private entities dependent on the primary private entities.
12450 Restore_Private_Views
(Act_Decl_Id
);
12452 -- Remove the current unit from visibility if this is an instance
12453 -- that is not elaborated on the fly for inlining purposes.
12455 if not Inlined_Body
then
12456 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
12461 -- If we have no body, and the unit requires a body, then complain. This
12462 -- complaint is suppressed if we have detected other errors (since a
12463 -- common reason for missing the body is that it had errors).
12464 -- In CodePeer mode, a warning has been emitted already, no need for
12465 -- further messages.
12467 elsif Unit_Requires_Body
(Gen_Unit
)
12468 and then not Body_Optional
12470 if CodePeer_Mode
then
12473 elsif Serious_Errors_Detected
= 0 then
12475 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
12477 -- Don't attempt to perform any cleanup actions if some other error
12478 -- was already detected, since this can cause blowups.
12484 -- Case of package that does not need a body
12487 -- If the instantiation of the declaration is a library unit, rewrite
12488 -- the original package instantiation as a package declaration in the
12489 -- compilation unit node.
12491 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12492 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
12493 Rewrite
(Inst_Node
, Act_Decl
);
12495 -- Generate elaboration entity, in case spec has elaboration code.
12496 -- This cannot be done when the instance is analyzed, because it
12497 -- is not known yet whether the body exists.
12499 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
12500 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
12502 -- If the instantiation is not a library unit, then append the
12503 -- declaration to the list of implicitly generated entities, unless
12504 -- it is already a list member which means that it was already
12507 elsif not Is_List_Member
(Act_Decl
) then
12508 Mark_Rewrite_Insertion
(Act_Decl
);
12509 Insert_Before
(Inst_Node
, Act_Decl
);
12515 -- Restore the context that was in effect prior to instantiating the
12518 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12519 Local_Suppress_Stack_Top
:= Saved_LSST
;
12520 Scope_Suppress
:= Saved_SS
;
12521 Style_Check
:= Saved_SC
;
12523 Expander_Mode_Restore
;
12524 Restore_Config_Switches
(Saved_CS
);
12525 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12526 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12527 Restore_Warnings
(Saved_Warn
);
12528 end Instantiate_Package_Body
;
12530 ---------------------------------
12531 -- Instantiate_Subprogram_Body --
12532 ---------------------------------
12534 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
12535 -- must be replaced by gotos which jump to the end of the routine in order
12536 -- to restore the Ghost and SPARK modes.
12538 procedure Instantiate_Subprogram_Body
12539 (Body_Info
: Pending_Body_Info
;
12540 Body_Optional
: Boolean := False)
12542 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
12543 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
12544 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
12545 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
12546 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
12547 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
12548 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
12549 Pack_Id
: constant Entity_Id
:=
12550 Defining_Unit_Name
(Parent
(Act_Decl
));
12552 -- The following constants capture the context prior to instantiating
12553 -- the subprogram body.
12555 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
12556 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
12557 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
12558 Saved_ISMP
: constant Boolean :=
12559 Ignore_SPARK_Mode_Pragmas_In_Instance
;
12560 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
12561 Local_Suppress_Stack_Top
;
12562 Saved_SC
: constant Boolean := Style_Check
;
12563 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
12564 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
12565 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
12566 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
12568 Act_Body
: Node_Id
;
12569 Act_Body_Id
: Entity_Id
;
12570 Gen_Body
: Node_Id
;
12571 Gen_Body_Id
: Node_Id
;
12572 Pack_Body
: Node_Id
;
12573 Par_Ent
: Entity_Id
:= Empty
;
12574 Par_Installed
: Boolean := False;
12575 Par_Vis
: Boolean := False;
12576 Ret_Expr
: Node_Id
;
12579 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12581 -- Subprogram body may have been created already because of an inline
12582 -- pragma, or because of multiple elaborations of the enclosing package
12583 -- when several instances of the subprogram appear in the main unit.
12585 if Present
(Corresponding_Body
(Act_Decl
)) then
12589 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
12591 -- Re-establish the state of information on which checks are suppressed.
12592 -- This information was set in Body_Info at the point of instantiation,
12593 -- and now we restore it so that the instance is compiled using the
12594 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
12596 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
12597 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
12599 Restore_Config_Switches
(Body_Info
.Config_Switches
);
12600 Restore_Warnings
(Body_Info
.Warnings
);
12602 if No
(Gen_Body_Id
) then
12604 -- For imported generic subprogram, no body to compile, complete
12605 -- the spec entity appropriately.
12607 if Is_Imported
(Gen_Unit
) then
12608 Set_Is_Imported
(Act_Decl_Id
);
12609 Set_First_Rep_Item
(Act_Decl_Id
, First_Rep_Item
(Gen_Unit
));
12610 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
12611 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
12612 Set_Has_Completion
(Act_Decl_Id
);
12615 -- For other cases, compile the body
12618 Load_Parent_Of_Generic
12619 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
12620 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12624 Instantiation_Node
:= Inst_Node
;
12626 -- The subprogram being instantiated may be subject to pragma Ghost. Set
12627 -- the mode now to ensure that any nodes generated during instantiation
12628 -- are properly marked as Ghost.
12630 Set_Ghost_Mode
(Act_Decl_Id
);
12632 if Present
(Gen_Body_Id
) then
12633 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12635 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
12637 -- Either body is not present, or context is non-expanding, as
12638 -- when compiling a subunit. Mark the instance as completed, and
12639 -- diagnose a missing body when needed.
12642 and then Operating_Mode
= Generate_Code
12644 Error_Msg_N
("missing proper body for instantiation", Gen_Body
);
12647 Set_Has_Completion
(Act_Decl_Id
);
12651 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12652 Style_Check
:= False;
12654 -- If the context of the instance is subject to SPARK_Mode "off", the
12655 -- annotation is missing, or the body is instantiated at a later pass
12656 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12657 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12660 if SPARK_Mode
/= On
12661 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12663 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12666 -- If the context of an instance is not subject to SPARK_Mode "off",
12667 -- and the generic body is subject to an explicit SPARK_Mode pragma,
12668 -- the latter should be the one applicable to the instance.
12670 if not Ignore_SPARK_Mode_Pragmas_In_Instance
12671 and then SPARK_Mode
/= Off
12672 and then Present
(SPARK_Pragma
(Gen_Body_Id
))
12674 Set_SPARK_Mode
(Gen_Body_Id
);
12677 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12678 Create_Instantiation_Source
12685 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12687 -- Create proper defining name for the body, to correspond to the one
12691 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12693 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12694 Set_Defining_Unit_Name
(Specification
(Act_Body
), Act_Body_Id
);
12696 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12697 Set_Has_Completion
(Act_Decl_Id
);
12698 Check_Generic_Actuals
(Pack_Id
, False);
12700 -- Generate a reference to link the visible subprogram instance to
12701 -- the generic body, which for navigation purposes is the only
12702 -- available source for the instance.
12705 (Related_Instance
(Pack_Id
),
12706 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
12708 -- If it is a child unit, make the parent instance (which is an
12709 -- instance of the parent of the generic) visible. The parent
12710 -- instance is the prefix of the name of the generic unit.
12712 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12713 and then Nkind
(Gen_Id
) = N_Expanded_Name
12715 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12716 elsif Is_Child_Unit
(Gen_Unit
) then
12717 Par_Ent
:= Scope
(Gen_Unit
);
12720 if Present
(Par_Ent
) then
12721 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12722 Install_Parent
(Par_Ent
, In_Body
=> True);
12723 Par_Installed
:= True;
12726 -- Subprogram body is placed in the body of wrapper package,
12727 -- whose spec contains the subprogram declaration as well as
12728 -- the renaming declarations for the generic parameters.
12731 Make_Package_Body
(Loc
,
12732 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12733 Declarations
=> New_List
(Act_Body
));
12735 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12737 -- If the instantiation is a library unit, then build resulting
12738 -- compilation unit nodes for the instance. The declaration of
12739 -- the enclosing package is the grandparent of the subprogram
12740 -- declaration. First replace the instantiation node as the unit
12741 -- of the corresponding compilation.
12743 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12744 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12745 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
12746 Build_Instance_Compilation_Unit_Nodes
12747 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
12748 Analyze
(Inst_Node
);
12750 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
12751 Analyze
(Pack_Body
);
12755 Insert_Before
(Inst_Node
, Pack_Body
);
12756 Mark_Rewrite_Insertion
(Pack_Body
);
12758 -- Insert the freeze node for the instance if need be
12760 if Expander_Active
then
12761 Freeze_Subprogram_Instance
(Inst_Node
, Gen_Body
, Pack_Id
);
12764 Analyze
(Pack_Body
);
12767 Inherit_Context
(Gen_Body
, Inst_Node
);
12769 Restore_Private_Views
(Pack_Id
, False);
12771 if Par_Installed
then
12772 Remove_Parent
(In_Body
=> True);
12774 -- Restore the previous visibility of the parent
12776 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12781 -- Body not found. Error was emitted already. If there were no previous
12782 -- errors, this may be an instance whose scope is a premature instance.
12783 -- In that case we must insure that the (legal) program does raise
12784 -- program error if executed. We generate a subprogram body for this
12787 elsif Serious_Errors_Detected
= 0
12788 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
12790 if Body_Optional
then
12793 elsif Ekind
(Act_Decl_Id
) = E_Procedure
then
12795 Make_Subprogram_Body
(Loc
,
12797 Make_Procedure_Specification
(Loc
,
12798 Defining_Unit_Name
=>
12799 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12800 Parameter_Specifications
=>
12802 (Parameter_Specifications
(Parent
(Act_Decl_Id
)))),
12804 Declarations
=> Empty_List
,
12805 Handled_Statement_Sequence
=>
12806 Make_Handled_Sequence_Of_Statements
(Loc
,
12807 Statements
=> New_List
(
12808 Make_Raise_Program_Error
(Loc
,
12809 Reason
=> PE_Access_Before_Elaboration
))));
12813 Make_Raise_Program_Error
(Loc
,
12814 Reason
=> PE_Access_Before_Elaboration
);
12816 Set_Etype
(Ret_Expr
, (Etype
(Act_Decl_Id
)));
12817 Set_Analyzed
(Ret_Expr
);
12820 Make_Subprogram_Body
(Loc
,
12822 Make_Function_Specification
(Loc
,
12823 Defining_Unit_Name
=>
12824 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12825 Parameter_Specifications
=>
12827 (Parameter_Specifications
(Parent
(Act_Decl_Id
))),
12828 Result_Definition
=>
12829 New_Occurrence_Of
(Etype
(Act_Decl_Id
), Loc
)),
12831 Declarations
=> Empty_List
,
12832 Handled_Statement_Sequence
=>
12833 Make_Handled_Sequence_Of_Statements
(Loc
,
12834 Statements
=> New_List
(
12835 Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
12839 Make_Package_Body
(Loc
,
12840 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12841 Declarations
=> New_List
(Act_Body
));
12843 Insert_After
(Inst_Node
, Pack_Body
);
12844 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12845 Analyze
(Pack_Body
);
12850 -- Restore the context that was in effect prior to instantiating the
12851 -- subprogram body.
12853 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12854 Local_Suppress_Stack_Top
:= Saved_LSST
;
12855 Scope_Suppress
:= Saved_SS
;
12856 Style_Check
:= Saved_SC
;
12858 Expander_Mode_Restore
;
12859 Restore_Config_Switches
(Saved_CS
);
12860 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12861 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12862 Restore_Warnings
(Saved_Warn
);
12863 end Instantiate_Subprogram_Body
;
12865 ----------------------
12866 -- Instantiate_Type --
12867 ----------------------
12869 function Instantiate_Type
12872 Analyzed_Formal
: Node_Id
;
12873 Actual_Decls
: List_Id
) return List_Id
12875 A_Gen_T
: constant Entity_Id
:=
12876 Defining_Identifier
(Analyzed_Formal
);
12877 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
12878 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
12880 Ancestor
: Entity_Id
:= Empty
;
12881 Decl_Node
: Node_Id
;
12882 Decl_Nodes
: List_Id
;
12886 procedure Check_Shared_Variable_Control_Aspects
;
12887 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12888 -- that may be specified for a formal type are obeyed by the actual.
12890 procedure Diagnose_Predicated_Actual
;
12891 -- There are a number of constructs in which a discrete type with
12892 -- predicates is illegal, e.g. as an index in an array type declaration.
12893 -- If a generic type is used is such a construct in a generic package
12894 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
12895 -- of the generic contract that the actual cannot have predicates.
12897 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
12898 -- Check that base types are the same and that the subtypes match
12899 -- statically. Used in several of the validation subprograms for
12900 -- actuals in instantiations.
12902 procedure Validate_Array_Type_Instance
;
12903 procedure Validate_Access_Subprogram_Instance
;
12904 procedure Validate_Access_Type_Instance
;
12905 procedure Validate_Derived_Type_Instance
;
12906 procedure Validate_Derived_Interface_Type_Instance
;
12907 procedure Validate_Discriminated_Formal_Type
;
12908 procedure Validate_Interface_Type_Instance
;
12909 procedure Validate_Private_Type_Instance
;
12910 procedure Validate_Incomplete_Type_Instance
;
12911 -- These procedures perform validation tests for the named case.
12912 -- Validate_Discriminated_Formal_Type is shared by formal private
12913 -- types and Ada 2012 formal incomplete types.
12915 --------------------------------------------
12916 -- Check_Shared_Variable_Control_Aspects --
12917 --------------------------------------------
12919 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12920 -- that may be specified for the formal are obeyed by the actual.
12921 -- If the formal is a derived type the aspect specifications must match.
12922 -- NOTE: AI12-0282 implies that matching of aspects is required between
12923 -- formal and actual in all cases, but this is too restrictive.
12924 -- In particular it violates a language design rule: a limited private
12925 -- indefinite formal can be matched by any actual. The current code
12926 -- reflects an older and more permissive version of RM C.6 (12/5).
12928 procedure Check_Shared_Variable_Control_Aspects
is
12930 if Ada_Version
>= Ada_2022
then
12931 if Is_Atomic
(A_Gen_T
) and then not Is_Atomic
(Act_T
) then
12933 ("actual for& must have Atomic aspect", Actual
, A_Gen_T
);
12935 elsif Is_Derived_Type
(A_Gen_T
)
12936 and then Is_Atomic
(A_Gen_T
) /= Is_Atomic
(Act_T
)
12939 ("actual for& has different Atomic aspect", Actual
, A_Gen_T
);
12942 if Is_Volatile
(A_Gen_T
) and then not Is_Volatile
(Act_T
) then
12944 ("actual for& must have Volatile aspect",
12947 elsif Is_Derived_Type
(A_Gen_T
)
12948 and then Is_Volatile
(A_Gen_T
) /= Is_Volatile
(Act_T
)
12951 ("actual for& has different Volatile aspect",
12955 -- We assume that an array type whose atomic component type
12956 -- is Atomic is equivalent to an array type with the explicit
12957 -- aspect Has_Atomic_Components. This is a reasonable inference
12958 -- from the intent of AI12-0282, and makes it legal to use an
12959 -- actual that does not have the identical aspect as the formal.
12960 -- Ditto for volatile components.
12963 Actual_Atomic_Comp
: constant Boolean :=
12964 Has_Atomic_Components
(Act_T
)
12965 or else (Is_Array_Type
(Act_T
)
12966 and then Is_Atomic
(Component_Type
(Act_T
)));
12968 if Has_Atomic_Components
(A_Gen_T
) /= Actual_Atomic_Comp
then
12970 ("formal and actual for& must agree on atomic components",
12976 Actual_Volatile_Comp
: constant Boolean :=
12977 Has_Volatile_Components
(Act_T
)
12978 or else (Is_Array_Type
(Act_T
)
12979 and then Is_Volatile
(Component_Type
(Act_T
)));
12981 if Has_Volatile_Components
(A_Gen_T
) /= Actual_Volatile_Comp
12984 ("actual for& must have volatile components",
12989 -- The following two aspects do not require exact matching,
12990 -- but only one-way agreement. See RM C.6.
12992 if Is_Independent
(A_Gen_T
) and then not Is_Independent
(Act_T
)
12995 ("actual for& must have Independent aspect specified",
12999 if Has_Independent_Components
(A_Gen_T
)
13000 and then not Has_Independent_Components
(Act_T
)
13003 ("actual for& must have Independent_Components specified",
13007 end Check_Shared_Variable_Control_Aspects
;
13009 ---------------------------------
13010 -- Diagnose_Predicated_Actual --
13011 ---------------------------------
13013 procedure Diagnose_Predicated_Actual
is
13015 if No_Predicate_On_Actual
(A_Gen_T
)
13016 and then Has_Predicates
(Act_T
)
13019 ("actual for& cannot be a type with predicate",
13020 Instantiation_Node
, A_Gen_T
);
13022 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
13023 and then Has_Predicates
(Act_T
)
13024 and then not Has_Static_Predicate_Aspect
(Act_T
)
13027 ("actual for& cannot be a type with a dynamic predicate",
13028 Instantiation_Node
, A_Gen_T
);
13030 end Diagnose_Predicated_Actual
;
13032 --------------------
13033 -- Subtypes_Match --
13034 --------------------
13036 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
13037 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
13040 -- Check that the base types, root types (when dealing with class
13041 -- wide types), or designated types (when dealing with anonymous
13042 -- access types) of Gen_T and Act_T are statically matching subtypes.
13044 return ((Base_Type
(T
) = Act_T
13045 or else Base_Type
(T
) = Base_Type
(Act_T
))
13046 and then Subtypes_Statically_Match
(T
, Act_T
))
13048 or else (Is_Class_Wide_Type
(Gen_T
)
13049 and then Is_Class_Wide_Type
(Act_T
)
13050 and then Subtypes_Match
13051 (Get_Instance_Of
(Root_Type
(Gen_T
)),
13052 Root_Type
(Act_T
)))
13054 or else (Is_Anonymous_Access_Type
(Gen_T
)
13055 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
13056 and then Subtypes_Statically_Match
13057 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
13058 end Subtypes_Match
;
13060 -----------------------------------------
13061 -- Validate_Access_Subprogram_Instance --
13062 -----------------------------------------
13064 procedure Validate_Access_Subprogram_Instance
is
13066 if not Is_Access_Type
(Act_T
)
13067 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
13070 ("expect access type in instantiation of &", Actual
, Gen_T
);
13071 Abandon_Instantiation
(Actual
);
13074 -- According to AI05-288, actuals for access_to_subprograms must be
13075 -- subtype conformant with the generic formal. Previous to AI05-288
13076 -- only mode conformance was required.
13078 -- This is a binding interpretation that applies to previous versions
13079 -- of the language, no need to maintain previous weaker checks.
13081 Check_Subtype_Conformant
13082 (Designated_Type
(Act_T
),
13083 Designated_Type
(A_Gen_T
),
13087 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
13088 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
13090 ("protected access type not allowed for formal &",
13094 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
13096 ("expect protected access type for formal &",
13100 -- If the formal has a specified convention (which in most cases
13101 -- will be StdCall) verify that the actual has the same convention.
13103 if Has_Convention_Pragma
(A_Gen_T
)
13104 and then Convention
(A_Gen_T
) /= Convention
(Act_T
)
13106 Error_Msg_Name_1
:= Get_Convention_Name
(Convention
(A_Gen_T
));
13108 ("actual for formal & must have convention %", Actual
, Gen_T
);
13111 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13113 ("non null exclusion of actual and formal & do not match",
13116 end Validate_Access_Subprogram_Instance
;
13118 -----------------------------------
13119 -- Validate_Access_Type_Instance --
13120 -----------------------------------
13122 procedure Validate_Access_Type_Instance
is
13123 Desig_Type
: constant Entity_Id
:=
13124 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
13125 Desig_Act
: Entity_Id
;
13128 if not Is_Access_Type
(Act_T
) then
13130 ("expect access type in instantiation of &", Actual
, Gen_T
);
13131 Abandon_Instantiation
(Actual
);
13134 if Is_Access_Constant
(A_Gen_T
) then
13135 if not Is_Access_Constant
(Act_T
) then
13137 ("actual type must be access-to-constant type", Actual
);
13138 Abandon_Instantiation
(Actual
);
13141 if Is_Access_Constant
(Act_T
) then
13143 ("actual type must be access-to-variable type", Actual
);
13144 Abandon_Instantiation
(Actual
);
13146 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
13147 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
13150 ("actual must be general access type!", Actual
);
13151 Error_Msg_NE
-- CODEFIX
13152 ("\add ALL to }!", Actual
, Act_T
);
13153 Abandon_Instantiation
(Actual
);
13157 -- The designated subtypes, that is to say the subtypes introduced
13158 -- by an access type declaration (and not by a subtype declaration)
13161 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
13163 -- The designated type may have been introduced through a limited_
13164 -- with clause, in which case retrieve the non-limited view. This
13165 -- applies to incomplete types as well as to class-wide types.
13167 if From_Limited_With
(Desig_Act
) then
13168 Desig_Act
:= Available_View
(Desig_Act
);
13171 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
13173 ("designated type of actual does not match that of formal &",
13176 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
13177 Error_Msg_N
("\predicates do not match", Actual
);
13180 Abandon_Instantiation
(Actual
);
13183 -- Ada 2005: null-exclusion indicators of the two types must agree
13185 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13187 ("non null exclusion of actual and formal & do not match",
13190 end Validate_Access_Type_Instance
;
13192 ----------------------------------
13193 -- Validate_Array_Type_Instance --
13194 ----------------------------------
13196 procedure Validate_Array_Type_Instance
is
13201 function Formal_Dimensions
return Nat
;
13202 -- Count number of dimensions in array type formal
13204 -----------------------
13205 -- Formal_Dimensions --
13206 -----------------------
13208 function Formal_Dimensions
return Nat
is
13213 if Nkind
(Def
) = N_Constrained_Array_Definition
then
13214 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
13216 Index
:= First
(Subtype_Marks
(Def
));
13219 while Present
(Index
) loop
13225 end Formal_Dimensions
;
13227 -- Start of processing for Validate_Array_Type_Instance
13230 if not Is_Array_Type
(Act_T
) then
13232 ("expect array type in instantiation of &", Actual
, Gen_T
);
13233 Abandon_Instantiation
(Actual
);
13235 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
13236 if not (Is_Constrained
(Act_T
)) then
13238 ("expect constrained array in instantiation of &",
13240 Abandon_Instantiation
(Actual
);
13244 if Is_Constrained
(Act_T
) then
13246 ("expect unconstrained array in instantiation of &",
13248 Abandon_Instantiation
(Actual
);
13252 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
13254 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
13255 Abandon_Instantiation
(Actual
);
13258 I1
:= First_Index
(A_Gen_T
);
13259 I2
:= First_Index
(Act_T
);
13260 for J
in 1 .. Formal_Dimensions
loop
13262 -- If the indexes of the actual were given by a subtype_mark,
13263 -- the index was transformed into a range attribute. Retrieve
13264 -- the original type mark for checking.
13266 if Is_Entity_Name
(Original_Node
(I2
)) then
13267 T2
:= Entity
(Original_Node
(I2
));
13272 if not Subtypes_Match
13273 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
13276 ("index types of actual do not match those of formal &",
13278 Abandon_Instantiation
(Actual
);
13285 -- Check matching subtypes. Note that there are complex visibility
13286 -- issues when the generic is a child unit and some aspect of the
13287 -- generic type is declared in a parent unit of the generic. We do
13288 -- the test to handle this special case only after a direct check
13289 -- for static matching has failed. The case where both the component
13290 -- type and the array type are separate formals, and the component
13291 -- type is a private view may also require special checking in
13292 -- Subtypes_Match. Finally, we assume that a child instance where
13293 -- the component type comes from a formal of a parent instance is
13294 -- correct because the generic was correct. A more precise check
13295 -- seems too complex to install???
13298 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
13301 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
13302 Component_Type
(Act_T
))
13304 (not Inside_A_Generic
13305 and then Is_Child_Unit
(Scope
(Component_Type
(A_Gen_T
))))
13310 ("component subtype of actual does not match that of formal &",
13312 Abandon_Instantiation
(Actual
);
13315 if Has_Aliased_Components
(A_Gen_T
)
13316 and then not Has_Aliased_Components
(Act_T
)
13319 ("actual must have aliased components to match formal type &",
13322 end Validate_Array_Type_Instance
;
13324 -----------------------------------------------
13325 -- Validate_Derived_Interface_Type_Instance --
13326 -----------------------------------------------
13328 procedure Validate_Derived_Interface_Type_Instance
is
13329 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
13333 -- First apply interface instance checks
13335 Validate_Interface_Type_Instance
;
13337 -- Verify that immediate parent interface is an ancestor of
13341 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
13344 ("interface actual must include progenitor&", Actual
, Par
);
13347 -- Now verify that the actual includes all other ancestors of
13350 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
13351 while Present
(Elmt
) loop
13352 if not Interface_Present_In_Ancestor
13353 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
13356 ("interface actual must include progenitor&",
13357 Actual
, Node
(Elmt
));
13362 end Validate_Derived_Interface_Type_Instance
;
13364 ------------------------------------
13365 -- Validate_Derived_Type_Instance --
13366 ------------------------------------
13368 procedure Validate_Derived_Type_Instance
is
13369 Actual_Discr
: Entity_Id
;
13370 Ancestor_Discr
: Entity_Id
;
13373 -- Verify that the actual includes the progenitors of the formal,
13374 -- if any. The formal may depend on previous formals and their
13375 -- instance, so we must examine instance of interfaces if present.
13376 -- The actual may be an extension of an interface, in which case
13377 -- it does not appear in the interface list, so this must be
13378 -- checked separately.
13380 if Present
(Interface_List
(Def
)) then
13381 if not Has_Interfaces
(Act_T
) then
13383 ("actual must implement all interfaces of formal&",
13388 Act_Iface_List
: Elist_Id
;
13390 Iface_Ent
: Entity_Id
;
13392 function Instance_Exists
(I
: Entity_Id
) return Boolean;
13393 -- If the interface entity is declared in a generic unit,
13394 -- this can only be legal if we are within an instantiation
13395 -- of a child of that generic. There is currently no
13396 -- mechanism to relate an interface declared within a
13397 -- generic to the corresponding interface in an instance,
13398 -- so we traverse the list of interfaces of the actual,
13399 -- looking for a name match.
13401 ---------------------
13402 -- Instance_Exists --
13403 ---------------------
13405 function Instance_Exists
(I
: Entity_Id
) return Boolean is
13406 Iface_Elmt
: Elmt_Id
;
13409 Iface_Elmt
:= First_Elmt
(Act_Iface_List
);
13410 while Present
(Iface_Elmt
) loop
13411 if Is_Generic_Instance
(Scope
(Node
(Iface_Elmt
)))
13412 and then Chars
(Node
(Iface_Elmt
)) = Chars
(I
)
13417 Next_Elmt
(Iface_Elmt
);
13421 end Instance_Exists
;
13424 Iface
:= First
(Abstract_Interface_List
(A_Gen_T
));
13425 Collect_Interfaces
(Act_T
, Act_Iface_List
);
13427 while Present
(Iface
) loop
13428 Iface_Ent
:= Get_Instance_Of
(Entity
(Iface
));
13430 if Is_Ancestor
(Iface_Ent
, Act_T
)
13431 or else Is_Progenitor
(Iface_Ent
, Act_T
)
13435 elsif Ekind
(Scope
(Iface_Ent
)) = E_Generic_Package
13436 and then Instance_Exists
(Iface_Ent
)
13441 Error_Msg_Name_1
:= Chars
(Act_T
);
13443 ("actual% must implement interface&",
13444 Actual
, Etype
(Iface
));
13453 -- If the parent type in the generic declaration is itself a previous
13454 -- formal type, then it is local to the generic and absent from the
13455 -- analyzed generic definition. In that case the ancestor is the
13456 -- instance of the formal (which must have been instantiated
13457 -- previously), unless the ancestor is itself a formal derived type.
13458 -- In this latter case (which is the subject of Corrigendum 8652/0038
13459 -- (AI-202) the ancestor of the formals is the ancestor of its
13460 -- parent. Otherwise, the analyzed generic carries the parent type.
13461 -- If the parent type is defined in a previous formal package, then
13462 -- the scope of that formal package is that of the generic type
13463 -- itself, and it has already been mapped into the corresponding type
13464 -- in the actual package.
13466 -- Common case: parent type defined outside of the generic
13468 if Is_Entity_Name
(Subtype_Mark
(Def
))
13469 and then Present
(Entity
(Subtype_Mark
(Def
)))
13471 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
13473 -- Check whether parent is defined in a previous formal package
13476 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
13479 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
13481 -- The type may be a local derivation, or a type extension of a
13482 -- previous formal, or of a formal of a parent package.
13484 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
13486 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
13488 -- Check whether the parent is another derived formal type in the
13489 -- same generic unit.
13491 if Etype
(A_Gen_T
) /= A_Gen_T
13492 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13493 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
13494 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
13496 -- Locate ancestor of parent from the subtype declaration
13497 -- created for the actual.
13503 Decl
:= First
(Actual_Decls
);
13504 while Present
(Decl
) loop
13505 if Nkind
(Decl
) = N_Subtype_Declaration
13506 and then Chars
(Defining_Identifier
(Decl
)) =
13507 Chars
(Etype
(A_Gen_T
))
13509 Ancestor
:= Generic_Parent_Type
(Decl
);
13517 pragma Assert
(Present
(Ancestor
));
13519 -- The ancestor itself may be a previous formal that has been
13522 Ancestor
:= Get_Instance_Of
(Ancestor
);
13526 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
13529 -- Check whether parent is a previous formal of the current generic
13531 elsif Is_Derived_Type
(A_Gen_T
)
13532 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13533 and then Scope
(A_Gen_T
) = Scope
(Etype
(A_Gen_T
))
13535 Ancestor
:= Get_Instance_Of
(First_Subtype
(Etype
(A_Gen_T
)));
13537 -- An unusual case: the actual is a type declared in a parent unit,
13538 -- but is not a formal type so there is no instance_of for it.
13539 -- Retrieve it by analyzing the record extension.
13541 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
13542 and then In_Open_Scopes
(Scope
(Act_T
))
13543 and then Is_Generic_Instance
(Scope
(Act_T
))
13545 Analyze
(Subtype_Mark
(Def
));
13546 Ancestor
:= Entity
(Subtype_Mark
(Def
));
13549 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
13552 -- If the formal derived type has pragma Preelaborable_Initialization
13553 -- then the actual type must have preelaborable initialization.
13555 if Known_To_Have_Preelab_Init
(A_Gen_T
)
13556 and then not Has_Preelaborable_Initialization
(Act_T
)
13559 ("actual for & must have preelaborable initialization",
13563 -- Ada 2005 (AI-251)
13565 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
13566 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
13568 ("(Ada 2005) expected type implementing & in instantiation",
13572 -- Finally verify that the (instance of) the ancestor is an ancestor
13575 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
13577 ("expect type derived from & in instantiation",
13578 Actual
, First_Subtype
(Ancestor
));
13579 Abandon_Instantiation
(Actual
);
13582 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
13583 -- that the formal type declaration has been rewritten as a private
13586 if Ada_Version
>= Ada_2005
13587 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
13588 and then Synchronized_Present
(Parent
(A_Gen_T
))
13590 -- The actual must be a synchronized tagged type
13592 if not Is_Tagged_Type
(Act_T
) then
13594 ("actual of synchronized type must be tagged", Actual
);
13595 Abandon_Instantiation
(Actual
);
13597 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
13598 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
13599 N_Derived_Type_Definition
13600 and then not Synchronized_Present
13601 (Type_Definition
(Parent
(Act_T
)))
13604 ("actual of synchronized type must be synchronized", Actual
);
13605 Abandon_Instantiation
(Actual
);
13609 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
13610 -- removes the second instance of the phrase "or allow pass by copy".
13612 -- For Ada 2022, the aspect may be specified explicitly for the
13613 -- formal regardless of whether an ancestor obeys it.
13615 if Is_Atomic
(Act_T
)
13616 and then not Is_Atomic
(Ancestor
)
13617 and then not Is_Atomic
(A_Gen_T
)
13620 ("cannot have atomic actual type for non-atomic formal type",
13623 elsif Is_Volatile
(Act_T
)
13624 and then not Is_Volatile
(Ancestor
)
13625 and then not Is_Volatile
(A_Gen_T
)
13628 ("cannot have volatile actual type for non-volatile formal type",
13632 -- It should not be necessary to check for unknown discriminants on
13633 -- Formal, but for some reason Has_Unknown_Discriminants is false for
13634 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
13635 -- needs fixing. ???
13637 if Is_Definite_Subtype
(A_Gen_T
)
13638 and then not Unknown_Discriminants_Present
(Formal
)
13639 and then not Is_Definite_Subtype
(Act_T
)
13641 Error_Msg_N
("actual subtype must be constrained", Actual
);
13642 Abandon_Instantiation
(Actual
);
13645 if not Unknown_Discriminants_Present
(Formal
) then
13646 if Is_Constrained
(Ancestor
) then
13647 if not Is_Constrained
(Act_T
) then
13648 Error_Msg_N
("actual subtype must be constrained", Actual
);
13649 Abandon_Instantiation
(Actual
);
13652 -- Ancestor is unconstrained, Check if generic formal and actual
13653 -- agree on constrainedness. The check only applies to array types
13654 -- and discriminated types.
13656 elsif Is_Constrained
(Act_T
) then
13657 if Ekind
(Ancestor
) = E_Access_Type
13658 or else (not Is_Constrained
(A_Gen_T
)
13659 and then Is_Composite_Type
(A_Gen_T
))
13661 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
13662 Abandon_Instantiation
(Actual
);
13665 -- A class-wide type is only allowed if the formal has unknown
13668 elsif Is_Class_Wide_Type
(Act_T
)
13669 and then not Has_Unknown_Discriminants
(Ancestor
)
13672 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
13673 Abandon_Instantiation
(Actual
);
13675 -- Otherwise, the formal and actual must have the same number
13676 -- of discriminants and each discriminant of the actual must
13677 -- correspond to a discriminant of the formal.
13679 elsif Has_Discriminants
(Act_T
)
13680 and then not Has_Unknown_Discriminants
(Act_T
)
13681 and then Has_Discriminants
(Ancestor
)
13683 Actual_Discr
:= First_Discriminant
(Act_T
);
13684 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
13685 while Present
(Actual_Discr
)
13686 and then Present
(Ancestor_Discr
)
13688 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
13689 No
(Corresponding_Discriminant
(Actual_Discr
))
13692 ("discriminant & does not correspond "
13693 & "to ancestor discriminant", Actual
, Actual_Discr
);
13694 Abandon_Instantiation
(Actual
);
13697 Next_Discriminant
(Actual_Discr
);
13698 Next_Discriminant
(Ancestor_Discr
);
13701 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
13703 ("actual for & must have same number of discriminants",
13705 Abandon_Instantiation
(Actual
);
13708 -- This case should be caught by the earlier check for
13709 -- constrainedness, but the check here is added for completeness.
13711 elsif Has_Discriminants
(Act_T
)
13712 and then not Has_Unknown_Discriminants
(Act_T
)
13715 ("actual for & must not have discriminants", Actual
, Gen_T
);
13716 Abandon_Instantiation
(Actual
);
13718 elsif Has_Discriminants
(Ancestor
) then
13720 ("actual for & must have known discriminants", Actual
, Gen_T
);
13721 Abandon_Instantiation
(Actual
);
13724 if not Subtypes_Statically_Compatible
13725 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
13728 ("actual for & must be statically compatible with ancestor",
13731 if not Predicates_Compatible
(Act_T
, Ancestor
) then
13733 ("\predicate on actual is not compatible with ancestor",
13737 Abandon_Instantiation
(Actual
);
13741 -- If the formal and actual types are abstract, check that there
13742 -- are no abstract primitives of the actual type that correspond to
13743 -- nonabstract primitives of the formal type (second sentence of
13746 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
13747 Check_Abstract_Primitives
: declare
13748 Gen_Prims
: constant Elist_Id
:=
13749 Primitive_Operations
(A_Gen_T
);
13750 Gen_Elmt
: Elmt_Id
;
13751 Gen_Subp
: Entity_Id
;
13752 Anc_Subp
: Entity_Id
;
13753 Anc_Formal
: Entity_Id
;
13754 Anc_F_Type
: Entity_Id
;
13756 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
13757 Act_Elmt
: Elmt_Id
;
13758 Act_Subp
: Entity_Id
;
13759 Act_Formal
: Entity_Id
;
13760 Act_F_Type
: Entity_Id
;
13762 Subprograms_Correspond
: Boolean;
13764 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
13765 -- Returns true if T2 is derived directly or indirectly from
13766 -- T1, including derivations from interfaces. T1 and T2 are
13767 -- required to be specific tagged base types.
13769 ------------------------
13770 -- Is_Tagged_Ancestor --
13771 ------------------------
13773 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
13775 Intfc_Elmt
: Elmt_Id
;
13778 -- The predicate is satisfied if the types are the same
13783 -- If we've reached the top of the derivation chain then
13784 -- we know that T1 is not an ancestor of T2.
13786 elsif Etype
(T2
) = T2
then
13789 -- Proceed to check T2's immediate parent
13791 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
13794 -- Finally, check to see if T1 is an ancestor of any of T2's
13798 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
13799 while Present
(Intfc_Elmt
) loop
13800 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
13804 Next_Elmt
(Intfc_Elmt
);
13809 end Is_Tagged_Ancestor
;
13811 -- Start of processing for Check_Abstract_Primitives
13814 -- Loop over all of the formal derived type's primitives
13816 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
13817 while Present
(Gen_Elmt
) loop
13818 Gen_Subp
:= Node
(Gen_Elmt
);
13820 -- If the primitive of the formal is not abstract, then
13821 -- determine whether there is a corresponding primitive of
13822 -- the actual type that's abstract.
13824 if not Is_Abstract_Subprogram
(Gen_Subp
) then
13825 Act_Elmt
:= First_Elmt
(Act_Prims
);
13826 while Present
(Act_Elmt
) loop
13827 Act_Subp
:= Node
(Act_Elmt
);
13829 -- If we find an abstract primitive of the actual,
13830 -- then we need to test whether it corresponds to the
13831 -- subprogram from which the generic formal primitive
13834 if Is_Abstract_Subprogram
(Act_Subp
) then
13835 Anc_Subp
:= Alias
(Gen_Subp
);
13837 -- Test whether we have a corresponding primitive
13838 -- by comparing names, kinds, formal types, and
13841 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
13842 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
13844 Anc_Formal
:= First_Formal
(Anc_Subp
);
13845 Act_Formal
:= First_Formal
(Act_Subp
);
13846 while Present
(Anc_Formal
)
13847 and then Present
(Act_Formal
)
13849 Anc_F_Type
:= Etype
(Anc_Formal
);
13850 Act_F_Type
:= Etype
(Act_Formal
);
13852 if Ekind
(Anc_F_Type
) =
13853 E_Anonymous_Access_Type
13855 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
13857 if Ekind
(Act_F_Type
) =
13858 E_Anonymous_Access_Type
13861 Designated_Type
(Act_F_Type
);
13867 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
13872 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13873 Act_F_Type
:= Base_Type
(Act_F_Type
);
13875 -- If the formal is controlling, then the
13876 -- the type of the actual primitive's formal
13877 -- must be derived directly or indirectly
13878 -- from the type of the ancestor primitive's
13881 if Is_Controlling_Formal
(Anc_Formal
) then
13882 if not Is_Tagged_Ancestor
13883 (Anc_F_Type
, Act_F_Type
)
13888 -- Otherwise the types of the formals must
13891 elsif Anc_F_Type
/= Act_F_Type
then
13895 Next_Formal
(Anc_Formal
);
13896 Next_Formal
(Act_Formal
);
13899 -- If we traversed through all of the formals
13900 -- then so far the subprograms correspond, so
13901 -- now check that any result types correspond.
13903 if No
(Anc_Formal
) and then No
(Act_Formal
) then
13904 Subprograms_Correspond
:= True;
13906 if Ekind
(Act_Subp
) = E_Function
then
13907 Anc_F_Type
:= Etype
(Anc_Subp
);
13908 Act_F_Type
:= Etype
(Act_Subp
);
13910 if Ekind
(Anc_F_Type
) =
13911 E_Anonymous_Access_Type
13914 Designated_Type
(Anc_F_Type
);
13916 if Ekind
(Act_F_Type
) =
13917 E_Anonymous_Access_Type
13920 Designated_Type
(Act_F_Type
);
13922 Subprograms_Correspond
:= False;
13927 = E_Anonymous_Access_Type
13929 Subprograms_Correspond
:= False;
13932 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13933 Act_F_Type
:= Base_Type
(Act_F_Type
);
13935 -- Now either the result types must be
13936 -- the same or, if the result type is
13937 -- controlling, the result type of the
13938 -- actual primitive must descend from the
13939 -- result type of the ancestor primitive.
13941 if Subprograms_Correspond
13942 and then Anc_F_Type
/= Act_F_Type
13944 Has_Controlling_Result
(Anc_Subp
)
13945 and then not Is_Tagged_Ancestor
13946 (Anc_F_Type
, Act_F_Type
)
13948 Subprograms_Correspond
:= False;
13952 -- Found a matching subprogram belonging to
13953 -- formal ancestor type, so actual subprogram
13954 -- corresponds and this violates 3.9.3(9).
13956 if Subprograms_Correspond
then
13958 ("abstract subprogram & overrides "
13959 & "nonabstract subprogram of ancestor",
13966 Next_Elmt
(Act_Elmt
);
13970 Next_Elmt
(Gen_Elmt
);
13972 end Check_Abstract_Primitives
;
13975 -- Verify that limitedness matches. If parent is a limited
13976 -- interface then the generic formal is not unless declared
13977 -- explicitly so. If not declared limited, the actual cannot be
13978 -- limited (see AI05-0087).
13980 if Is_Limited_Type
(Act_T
) and then not Is_Limited_Type
(A_Gen_T
) then
13981 if not In_Instance
then
13983 ("actual for non-limited & cannot be a limited type",
13985 Explain_Limited_Type
(Act_T
, Actual
);
13986 Abandon_Instantiation
(Actual
);
13990 -- Check for AI12-0036
13993 Formal_Is_Private_Extension
: constant Boolean :=
13994 Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
;
13996 Actual_Is_Tagged
: constant Boolean := Is_Tagged_Type
(Act_T
);
13999 if Actual_Is_Tagged
/= Formal_Is_Private_Extension
then
14000 if not In_Instance
then
14001 if Actual_Is_Tagged
then
14003 ("actual for & cannot be a tagged type", Actual
, Gen_T
);
14006 ("actual for & must be a tagged type", Actual
, Gen_T
);
14009 Abandon_Instantiation
(Actual
);
14013 end Validate_Derived_Type_Instance
;
14015 ----------------------------------------
14016 -- Validate_Discriminated_Formal_Type --
14017 ----------------------------------------
14019 procedure Validate_Discriminated_Formal_Type
is
14020 Formal_Discr
: Entity_Id
;
14021 Actual_Discr
: Entity_Id
;
14022 Formal_Subt
: Entity_Id
;
14025 if Has_Discriminants
(A_Gen_T
) then
14026 if not Has_Discriminants
(Act_T
) then
14028 ("actual for & must have discriminants", Actual
, Gen_T
);
14029 Abandon_Instantiation
(Actual
);
14031 elsif Is_Constrained
(Act_T
) then
14033 ("actual for & must be unconstrained", Actual
, Gen_T
);
14034 Abandon_Instantiation
(Actual
);
14037 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
14038 Actual_Discr
:= First_Discriminant
(Act_T
);
14039 while Formal_Discr
/= Empty
loop
14040 if Actual_Discr
= Empty
then
14042 ("discriminants on actual do not match formal",
14044 Abandon_Instantiation
(Actual
);
14047 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
14049 -- Access discriminants match if designated types do
14051 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
14052 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
14053 E_Anonymous_Access_Type
14057 (Designated_Type
(Base_Type
(Formal_Subt
))),
14058 Designated_Type
(Base_Type
(Etype
(Actual_Discr
))))
14062 elsif Base_Type
(Formal_Subt
) /=
14063 Base_Type
(Etype
(Actual_Discr
))
14066 ("types of actual discriminants must match formal",
14068 Abandon_Instantiation
(Actual
);
14070 elsif not Subtypes_Statically_Match
14071 (Formal_Subt
, Etype
(Actual_Discr
))
14072 and then Ada_Version
>= Ada_95
14075 ("subtypes of actual discriminants must match formal",
14077 Abandon_Instantiation
(Actual
);
14080 Next_Discriminant
(Formal_Discr
);
14081 Next_Discriminant
(Actual_Discr
);
14084 if Actual_Discr
/= Empty
then
14086 ("discriminants on actual do not match formal",
14088 Abandon_Instantiation
(Actual
);
14092 end Validate_Discriminated_Formal_Type
;
14094 ---------------------------------------
14095 -- Validate_Incomplete_Type_Instance --
14096 ---------------------------------------
14098 procedure Validate_Incomplete_Type_Instance
is
14100 if not Is_Tagged_Type
(Act_T
)
14101 and then Is_Tagged_Type
(A_Gen_T
)
14104 ("actual for & must be a tagged type", Actual
, Gen_T
);
14107 Validate_Discriminated_Formal_Type
;
14108 end Validate_Incomplete_Type_Instance
;
14110 --------------------------------------
14111 -- Validate_Interface_Type_Instance --
14112 --------------------------------------
14114 procedure Validate_Interface_Type_Instance
is
14116 if not Is_Interface
(Act_T
) then
14118 ("actual for formal interface type must be an interface",
14121 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
14122 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
14123 or else Is_Protected_Interface
(A_Gen_T
) /=
14124 Is_Protected_Interface
(Act_T
)
14125 or else Is_Synchronized_Interface
(A_Gen_T
) /=
14126 Is_Synchronized_Interface
(Act_T
)
14129 ("actual for interface& does not match (RM 12.5.5(4))",
14132 end Validate_Interface_Type_Instance
;
14134 ------------------------------------
14135 -- Validate_Private_Type_Instance --
14136 ------------------------------------
14138 procedure Validate_Private_Type_Instance
is
14140 if Is_Limited_Type
(Act_T
)
14141 and then not Is_Limited_Type
(A_Gen_T
)
14143 if In_Instance
then
14147 ("actual for non-limited & cannot be a limited type", Actual
,
14149 Explain_Limited_Type
(Act_T
, Actual
);
14150 Abandon_Instantiation
(Actual
);
14153 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
14154 and then not Has_Preelaborable_Initialization
(Act_T
)
14157 ("actual for & must have preelaborable initialization", Actual
,
14160 elsif not Is_Definite_Subtype
(Act_T
)
14161 and then Is_Definite_Subtype
(A_Gen_T
)
14162 and then Ada_Version
>= Ada_95
14165 ("actual for & must be a definite subtype", Actual
, Gen_T
);
14167 elsif not Is_Tagged_Type
(Act_T
)
14168 and then Is_Tagged_Type
(A_Gen_T
)
14171 ("actual for & must be a tagged type", Actual
, Gen_T
);
14174 Validate_Discriminated_Formal_Type
;
14176 end Validate_Private_Type_Instance
;
14178 -- Start of processing for Instantiate_Type
14181 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
14182 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
14183 return New_List
(Error
);
14185 elsif not Is_Entity_Name
(Actual
)
14186 or else not Is_Type
(Entity
(Actual
))
14189 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
14190 Abandon_Instantiation
(Actual
);
14193 Act_T
:= Entity
(Actual
);
14195 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
14196 -- as a generic actual parameter if the corresponding formal type
14197 -- does not have a known_discriminant_part, or is a formal derived
14198 -- type that is an Unchecked_Union type.
14200 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
14201 if not Has_Discriminants
(A_Gen_T
)
14202 or else (Is_Derived_Type
(A_Gen_T
)
14203 and then Is_Unchecked_Union
(A_Gen_T
))
14207 Error_Msg_N
("unchecked union cannot be the actual for a "
14208 & "discriminated formal type", Act_T
);
14213 -- Deal with fixed/floating restrictions
14215 if Is_Floating_Point_Type
(Act_T
) then
14216 Check_Restriction
(No_Floating_Point
, Actual
);
14217 elsif Is_Fixed_Point_Type
(Act_T
) then
14218 Check_Restriction
(No_Fixed_Point
, Actual
);
14221 -- Deal with error of using incomplete type as generic actual.
14222 -- This includes limited views of a type, even if the non-limited
14223 -- view may be available.
14225 if Ekind
(Act_T
) = E_Incomplete_Type
14226 or else (Is_Class_Wide_Type
(Act_T
)
14227 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
14229 -- If the formal is an incomplete type, the actual can be
14230 -- incomplete as well, but if an actual incomplete type has
14231 -- a full view, then we'll retrieve that.
14233 if Ekind
(A_Gen_T
) = E_Incomplete_Type
14234 and then No
(Full_View
(Act_T
))
14238 elsif Is_Class_Wide_Type
(Act_T
)
14239 or else No
(Full_View
(Act_T
))
14241 Error_Msg_N
("premature use of incomplete type", Actual
);
14242 Abandon_Instantiation
(Actual
);
14245 Act_T
:= Full_View
(Act_T
);
14246 Set_Entity
(Actual
, Act_T
);
14248 if Has_Private_Component
(Act_T
) then
14250 ("premature use of type with private component", Actual
);
14254 -- Deal with error of premature use of private type as generic actual
14256 elsif Is_Private_Type
(Act_T
)
14257 and then Is_Private_Type
(Base_Type
(Act_T
))
14258 and then not Is_Generic_Type
(Act_T
)
14259 and then not Is_Derived_Type
(Act_T
)
14260 and then No
(Full_View
(Root_Type
(Act_T
)))
14262 -- If the formal is an incomplete type, the actual can be
14263 -- private or incomplete as well.
14265 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
14268 Error_Msg_N
("premature use of private type", Actual
);
14271 elsif Has_Private_Component
(Act_T
) then
14273 ("premature use of type with private component", Actual
);
14276 Set_Instance_Of
(A_Gen_T
, Act_T
);
14278 -- If the type is generic, the class-wide type may also be used
14280 if Is_Tagged_Type
(A_Gen_T
)
14281 and then Is_Tagged_Type
(Act_T
)
14282 and then not Is_Class_Wide_Type
(A_Gen_T
)
14284 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
14285 Class_Wide_Type
(Act_T
));
14288 if not Is_Abstract_Type
(A_Gen_T
)
14289 and then Is_Abstract_Type
(Act_T
)
14292 ("actual of non-abstract formal cannot be abstract", Actual
);
14295 -- A generic scalar type is a first subtype for which we generate
14296 -- an anonymous base type. Indicate that the instance of this base
14297 -- is the base type of the actual.
14299 if Is_Scalar_Type
(A_Gen_T
) then
14300 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
14304 Check_Shared_Variable_Control_Aspects
;
14306 if Error_Posted
(Act_T
) then
14309 case Nkind
(Def
) is
14310 when N_Formal_Private_Type_Definition
=>
14311 Validate_Private_Type_Instance
;
14313 when N_Formal_Incomplete_Type_Definition
=>
14314 Validate_Incomplete_Type_Instance
;
14316 when N_Formal_Derived_Type_Definition
=>
14317 Validate_Derived_Type_Instance
;
14319 when N_Formal_Discrete_Type_Definition
=>
14320 if not Is_Discrete_Type
(Act_T
) then
14322 ("expect discrete type in instantiation of&",
14324 Abandon_Instantiation
(Actual
);
14327 Diagnose_Predicated_Actual
;
14329 when N_Formal_Signed_Integer_Type_Definition
=>
14330 if not Is_Signed_Integer_Type
(Act_T
) then
14332 ("expect signed integer type in instantiation of&",
14334 Abandon_Instantiation
(Actual
);
14337 Diagnose_Predicated_Actual
;
14339 when N_Formal_Modular_Type_Definition
=>
14340 if not Is_Modular_Integer_Type
(Act_T
) then
14342 ("expect modular type in instantiation of &",
14344 Abandon_Instantiation
(Actual
);
14347 Diagnose_Predicated_Actual
;
14349 when N_Formal_Floating_Point_Definition
=>
14350 if not Is_Floating_Point_Type
(Act_T
) then
14352 ("expect float type in instantiation of &", Actual
, Gen_T
);
14353 Abandon_Instantiation
(Actual
);
14356 when N_Formal_Ordinary_Fixed_Point_Definition
=>
14357 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
14359 ("expect ordinary fixed point type in instantiation of &",
14361 Abandon_Instantiation
(Actual
);
14364 when N_Formal_Decimal_Fixed_Point_Definition
=>
14365 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
14367 ("expect decimal type in instantiation of &",
14369 Abandon_Instantiation
(Actual
);
14372 when N_Array_Type_Definition
=>
14373 Validate_Array_Type_Instance
;
14375 when N_Access_To_Object_Definition
=>
14376 Validate_Access_Type_Instance
;
14378 when N_Access_Function_Definition
14379 | N_Access_Procedure_Definition
14381 Validate_Access_Subprogram_Instance
;
14383 when N_Record_Definition
=>
14384 Validate_Interface_Type_Instance
;
14386 when N_Derived_Type_Definition
=>
14387 Validate_Derived_Interface_Type_Instance
;
14390 raise Program_Error
;
14394 Subt
:= New_Copy
(Gen_T
);
14396 -- Use adjusted sloc of subtype name as the location for other nodes in
14397 -- the subtype declaration.
14399 Loc
:= Sloc
(Subt
);
14402 Make_Subtype_Declaration
(Loc
,
14403 Defining_Identifier
=> Subt
,
14404 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
14406 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
14408 -- Record whether the actual is private at this point, so that
14409 -- Check_Generic_Actuals can restore its proper view before the
14410 -- semantic analysis of the instance.
14412 if Is_Private_Type
(Act_T
) then
14413 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
14415 elsif (Is_Access_Type
(Act_T
)
14416 and then Is_Private_Type
(Designated_Type
(Act_T
)))
14417 or else (Is_Array_Type
(Act_T
)
14419 Is_Private_Type
(Component_Type_For_Private_View
(Act_T
)))
14421 Set_Has_Secondary_Private_View
(Subtype_Indication
(Decl_Node
));
14424 -- In Ada 2012 the actual may be a limited view. Indicate that
14425 -- the local subtype must be treated as such.
14427 if From_Limited_With
(Act_T
) then
14428 Mutate_Ekind
(Subt
, E_Incomplete_Subtype
);
14429 Set_From_Limited_With
(Subt
);
14432 Decl_Nodes
:= New_List
(Decl_Node
);
14434 -- Flag actual derived types so their elaboration produces the
14435 -- appropriate renamings for the primitive operations of the ancestor.
14436 -- Flag actual for formal private types as well, to determine whether
14437 -- operations in the private part may override inherited operations.
14438 -- If the formal has an interface list, the ancestor is not the
14439 -- parent, but the analyzed formal that includes the interface
14440 -- operations of all its progenitors.
14442 -- Same treatment for formal private types, so we can check whether the
14443 -- type is tagged limited when validating derivations in the private
14444 -- part. (See AI05-096).
14446 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
14447 if Present
(Interface_List
(Def
)) then
14448 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14450 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
14453 elsif Nkind
(Def
) in N_Formal_Private_Type_Definition
14454 | N_Formal_Incomplete_Type_Definition
14456 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14459 -- If the actual is a synchronized type that implements an interface,
14460 -- the primitive operations are attached to the corresponding record,
14461 -- and we have to treat it as an additional generic actual, so that its
14462 -- primitive operations become visible in the instance. The task or
14463 -- protected type itself does not carry primitive operations.
14465 if Is_Concurrent_Type
(Act_T
)
14466 and then Is_Tagged_Type
(Act_T
)
14467 and then Present
(Corresponding_Record_Type
(Act_T
))
14468 and then Present
(Ancestor
)
14469 and then Is_Interface
(Ancestor
)
14472 Corr_Rec
: constant Entity_Id
:=
14473 Corresponding_Record_Type
(Act_T
);
14474 New_Corr
: Entity_Id
;
14475 Corr_Decl
: Node_Id
;
14478 New_Corr
:= Make_Temporary
(Loc
, 'S');
14480 Make_Subtype_Declaration
(Loc
,
14481 Defining_Identifier
=> New_Corr
,
14482 Subtype_Indication
=>
14483 New_Occurrence_Of
(Corr_Rec
, Loc
));
14484 Append_To
(Decl_Nodes
, Corr_Decl
);
14486 if Ekind
(Act_T
) = E_Task_Type
then
14487 Mutate_Ekind
(Subt
, E_Task_Subtype
);
14489 Mutate_Ekind
(Subt
, E_Protected_Subtype
);
14492 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
14493 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
14494 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
14498 -- For a floating-point type, capture dimension info if any, because
14499 -- the generated subtype declaration does not come from source and
14500 -- will not process dimensions.
14502 if Is_Floating_Point_Type
(Act_T
) then
14503 Copy_Dimensions
(Act_T
, Subt
);
14507 end Instantiate_Type
;
14509 -----------------------------
14510 -- Is_Abbreviated_Instance --
14511 -----------------------------
14513 function Is_Abbreviated_Instance
(E
: Entity_Id
) return Boolean is
14515 return Ekind
(E
) = E_Package
14516 and then Present
(Hidden_In_Formal_Instance
(E
));
14517 end Is_Abbreviated_Instance
;
14519 ---------------------
14520 -- Is_In_Main_Unit --
14521 ---------------------
14523 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
14524 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
14525 Current_Unit
: Node_Id
;
14528 if Unum
= Main_Unit
then
14531 -- If the current unit is a subunit then it is either the main unit or
14532 -- is being compiled as part of the main unit.
14534 elsif Nkind
(N
) = N_Compilation_Unit
then
14535 return Nkind
(Unit
(N
)) = N_Subunit
;
14538 Current_Unit
:= Parent
(N
);
14539 while Present
(Current_Unit
)
14540 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
14542 Current_Unit
:= Parent
(Current_Unit
);
14545 -- The instantiation node is in the main unit, or else the current node
14546 -- (perhaps as the result of nested instantiations) is in the main unit,
14547 -- or in the declaration of the main unit, which in this last case must
14551 Current_Unit
= Cunit
(Main_Unit
)
14552 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
14553 or else (Present
(Current_Unit
)
14554 and then Present
(Library_Unit
(Current_Unit
))
14555 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
14556 end Is_In_Main_Unit
;
14558 ----------------------------
14559 -- Load_Parent_Of_Generic --
14560 ----------------------------
14562 procedure Load_Parent_Of_Generic
14565 Body_Optional
: Boolean := False)
14567 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
14568 Saved_Style_Check
: constant Boolean := Style_Check
;
14569 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
14570 True_Parent
: Node_Id
;
14571 Inst_Node
: Node_Id
;
14573 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
14575 procedure Collect_Previous_Instances
(Decls
: List_Id
);
14576 -- Collect all instantiations in the given list of declarations, that
14577 -- precede the generic that we need to load. If the bodies of these
14578 -- instantiations are available, we must analyze them, to ensure that
14579 -- the public symbols generated are the same when the unit is compiled
14580 -- to generate code, and when it is compiled in the context of a unit
14581 -- that needs a particular nested instance. This process is applied to
14582 -- both package and subprogram instances.
14584 --------------------------------
14585 -- Collect_Previous_Instances --
14586 --------------------------------
14588 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
14592 Decl
:= First
(Decls
);
14593 while Present
(Decl
) loop
14594 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
14597 -- If Decl is an instantiation, then record it as requiring
14598 -- instantiation of the corresponding body, except if it is an
14599 -- abbreviated instantiation generated internally for conformance
14600 -- checking purposes only for the case of a formal package
14601 -- declared without a box (see Instantiate_Formal_Package). Such
14602 -- an instantiation does not generate any code (the actual code
14603 -- comes from actual) and thus does not need to be analyzed here.
14604 -- If the instantiation appears with a generic package body it is
14605 -- not analyzed here either.
14607 elsif Nkind
(Decl
) = N_Package_Instantiation
14608 and then not Is_Abbreviated_Instance
(Defining_Entity
(Decl
))
14610 Append_Elmt
(Decl
, Previous_Instances
);
14612 -- For a subprogram instantiation, omit instantiations intrinsic
14613 -- operations (Unchecked_Conversions, etc.) that have no bodies.
14615 elsif Nkind
(Decl
) in N_Function_Instantiation
14616 | N_Procedure_Instantiation
14617 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
14619 Append_Elmt
(Decl
, Previous_Instances
);
14621 elsif Nkind
(Decl
) = N_Package_Declaration
then
14622 Collect_Previous_Instances
14623 (Visible_Declarations
(Specification
(Decl
)));
14624 Collect_Previous_Instances
14625 (Private_Declarations
(Specification
(Decl
)));
14627 -- Previous non-generic bodies may contain instances as well
14629 elsif Nkind
(Decl
) = N_Package_Body
14630 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
14632 Collect_Previous_Instances
(Declarations
(Decl
));
14634 elsif Nkind
(Decl
) = N_Subprogram_Body
14635 and then not Acts_As_Spec
(Decl
)
14636 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
14638 Collect_Previous_Instances
(Declarations
(Decl
));
14643 end Collect_Previous_Instances
;
14645 -- Start of processing for Load_Parent_Of_Generic
14648 if not In_Same_Source_Unit
(N
, Spec
)
14649 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
14650 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
14651 and then not Is_In_Main_Unit
(Spec
))
14653 -- Find body of parent of spec, and analyze it. A special case arises
14654 -- when the parent is an instantiation, that is to say when we are
14655 -- currently instantiating a nested generic. In that case, there is
14656 -- no separate file for the body of the enclosing instance. Instead,
14657 -- the enclosing body must be instantiated as if it were a pending
14658 -- instantiation, in order to produce the body for the nested generic
14659 -- we require now. Note that in that case the generic may be defined
14660 -- in a package body, the instance defined in the same package body,
14661 -- and the original enclosing body may not be in the main unit.
14663 Inst_Node
:= Empty
;
14665 True_Parent
:= Parent
(Spec
);
14666 while Present
(True_Parent
)
14667 and then Nkind
(True_Parent
) /= N_Compilation_Unit
14669 if Nkind
(True_Parent
) = N_Package_Declaration
14671 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
14673 -- Parent is a compilation unit that is an instantiation, and
14674 -- instantiation node has been replaced with package decl.
14676 Inst_Node
:= Original_Node
(True_Parent
);
14679 elsif Nkind
(True_Parent
) = N_Package_Declaration
14680 and then Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
14682 Nkind
(Unit
(Parent
(True_Parent
))) = N_Package_Instantiation
14684 -- Parent is a compilation unit that is an instantiation, but
14685 -- instantiation node has not been replaced with package decl.
14687 Inst_Node
:= Unit
(Parent
(True_Parent
));
14690 elsif Nkind
(True_Parent
) = N_Package_Declaration
14691 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14692 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
14694 -- Parent is an instantiation within another specification.
14695 -- Declaration for instance has been inserted before original
14696 -- instantiation node. A direct link would be preferable?
14698 Inst_Node
:= Next
(True_Parent
);
14699 while Present
(Inst_Node
)
14700 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
14705 -- If the instance appears within a generic, and the generic
14706 -- unit is defined within a formal package of the enclosing
14707 -- generic, there is no generic body available, and none
14708 -- needed. A more precise test should be used ???
14710 if No
(Inst_Node
) then
14716 -- If an ancestor of the generic comes from a formal package
14717 -- there is no source for the ancestor body. This is detected
14718 -- by examining the scope of the ancestor and its declaration.
14719 -- The body, if any is needed, will be available when the
14720 -- current unit (containing a formal package) is instantiated.
14722 elsif Nkind
(True_Parent
) = N_Package_Specification
14723 and then Present
(Generic_Parent
(True_Parent
))
14725 (Original_Node
(Unit_Declaration_Node
14726 (Scope
(Generic_Parent
(True_Parent
)))))
14727 = N_Formal_Package_Declaration
14732 True_Parent
:= Parent
(True_Parent
);
14736 -- Case where we are currently instantiating a nested generic
14738 if Present
(Inst_Node
) then
14739 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
14741 -- Instantiation node and declaration of instantiated package
14742 -- were exchanged when only the declaration was needed.
14743 -- Restore instantiation node before proceeding with body.
14745 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
14748 -- Now complete instantiation of enclosing body, if it appears in
14749 -- some other unit. If it appears in the current unit, the body
14750 -- will have been instantiated already.
14752 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
14754 -- We need to determine the expander mode to instantiate the
14755 -- enclosing body. Because the generic body we need may use
14756 -- global entities declared in the enclosing package (including
14757 -- aggregates) it is in general necessary to compile this body
14758 -- with expansion enabled, except if we are within a generic
14759 -- package, in which case the usual generic rule applies.
14762 Exp_Status
: Boolean := True;
14766 -- Loop through scopes looking for generic package
14768 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
14769 while Present
(Scop
)
14770 and then Scop
/= Standard_Standard
14772 if Ekind
(Scop
) = E_Generic_Package
then
14773 Exp_Status
:= False;
14777 Scop
:= Scope
(Scop
);
14780 -- Collect previous instantiations in the unit that contains
14781 -- the desired generic.
14783 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14784 and then not Body_Optional
14788 Info
: Pending_Body_Info
;
14792 Par
:= Parent
(Inst_Node
);
14793 while Present
(Par
) loop
14794 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
14795 Par
:= Parent
(Par
);
14798 pragma Assert
(Present
(Par
));
14800 if Nkind
(Par
) = N_Package_Body
then
14801 Collect_Previous_Instances
(Declarations
(Par
));
14803 elsif Nkind
(Par
) = N_Package_Declaration
then
14804 Collect_Previous_Instances
14805 (Visible_Declarations
(Specification
(Par
)));
14806 Collect_Previous_Instances
14807 (Private_Declarations
(Specification
(Par
)));
14810 -- Enclosing unit is a subprogram body. In this
14811 -- case all instance bodies are processed in order
14812 -- and there is no need to collect them separately.
14817 Decl
:= First_Elmt
(Previous_Instances
);
14818 while Present
(Decl
) loop
14820 (Inst_Node
=> Node
(Decl
),
14822 Instance_Spec
(Node
(Decl
)),
14824 Config_Switches
=> Save_Config_Switches
,
14825 Current_Sem_Unit
=>
14826 Get_Code_Unit
(Sloc
(Node
(Decl
))),
14827 Expander_Status
=> Exp_Status
,
14828 Local_Suppress_Stack_Top
=>
14829 Local_Suppress_Stack_Top
,
14830 Scope_Suppress
=> Scope_Suppress
,
14831 Warnings
=> Save_Warnings
);
14833 -- Package instance
14835 if Nkind
(Node
(Decl
)) = N_Package_Instantiation
14837 Instantiate_Package_Body
14838 (Info
, Body_Optional
=> True);
14840 -- Subprogram instance
14843 -- The instance_spec is in the wrapper package,
14844 -- usually followed by its local renaming
14845 -- declaration. See Build_Subprogram_Renaming
14846 -- for details. If the instance carries aspects,
14847 -- these result in the corresponding pragmas,
14848 -- inserted after the subprogram declaration.
14849 -- They must be skipped as well when retrieving
14850 -- the desired spec. Some of them may have been
14851 -- rewritten as null statements.
14852 -- A direct link would be more robust ???
14856 (Last
(Visible_Declarations
14857 (Specification
(Info
.Act_Decl
))));
14859 while Nkind
(Decl
) in
14862 N_Subprogram_Renaming_Declaration
14864 Decl
:= Prev
(Decl
);
14867 Info
.Act_Decl
:= Decl
;
14870 Instantiate_Subprogram_Body
14871 (Info
, Body_Optional
=> True);
14879 Instantiate_Package_Body
14881 ((Inst_Node
=> Inst_Node
,
14882 Act_Decl
=> True_Parent
,
14884 Config_Switches
=> Save_Config_Switches
,
14885 Current_Sem_Unit
=>
14886 Get_Code_Unit
(Sloc
(Inst_Node
)),
14887 Expander_Status
=> Exp_Status
,
14888 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
14889 Scope_Suppress
=> Scope_Suppress
,
14890 Warnings
=> Save_Warnings
)),
14891 Body_Optional
=> Body_Optional
);
14895 -- Case where we are not instantiating a nested generic
14898 Opt
.Style_Check
:= False;
14899 Expander_Mode_Save_And_Set
(True);
14900 Load_Needed_Body
(Comp_Unit
, OK
);
14901 Opt
.Style_Check
:= Saved_Style_Check
;
14902 Restore_Warnings
(Saved_Warn
);
14903 Expander_Mode_Restore
;
14906 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
14907 and then not Body_Optional
14910 Bname
: constant Unit_Name_Type
:=
14911 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
14914 -- In CodePeer mode, the missing body may make the analysis
14915 -- incomplete, but we do not treat it as fatal.
14917 if CodePeer_Mode
then
14921 Error_Msg_Unit_1
:= Bname
;
14922 Error_Msg_N
("this instantiation requires$!", N
);
14923 Error_Msg_File_1
:=
14924 Get_File_Name
(Bname
, Subunit
=> False);
14925 Error_Msg_N
("\but file{ was not found!", N
);
14926 raise Unrecoverable_Error
;
14933 -- If loading parent of the generic caused an instantiation circularity,
14934 -- we abandon compilation at this point, because otherwise in some cases
14935 -- we get into trouble with infinite recursions after this point.
14937 if Circularity_Detected
then
14938 raise Unrecoverable_Error
;
14940 end Load_Parent_Of_Generic
;
14942 ---------------------------------
14943 -- Map_Formal_Package_Entities --
14944 ---------------------------------
14946 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
14951 Set_Instance_Of
(Form
, Act
);
14953 -- Traverse formal and actual package to map the corresponding entities.
14954 -- We skip over internal entities that may be generated during semantic
14955 -- analysis, and find the matching entities by name, given that they
14956 -- must appear in the same order.
14958 E1
:= First_Entity
(Form
);
14959 E2
:= First_Entity
(Act
);
14960 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
14961 -- Could this test be a single condition??? Seems like it could, and
14962 -- isn't FPE (Form) a constant anyway???
14964 if not Is_Internal
(E1
)
14965 and then Present
(Parent
(E1
))
14966 and then not Is_Class_Wide_Type
(E1
)
14967 and then not Is_Internal_Name
(Chars
(E1
))
14969 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
14976 Set_Instance_Of
(E1
, E2
);
14978 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
14979 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
14982 if Is_Constrained
(E1
) then
14983 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
14986 if Ekind
(E1
) = E_Package
and then No
(Renamed_Entity
(E1
)) then
14987 Map_Formal_Package_Entities
(E1
, E2
);
14994 end Map_Formal_Package_Entities
;
14996 -----------------------
14997 -- Move_Freeze_Nodes --
14998 -----------------------
15000 procedure Move_Freeze_Nodes
15001 (Out_Of
: Entity_Id
;
15006 Next_Decl
: Node_Id
;
15007 Next_Node
: Node_Id
:= After
;
15010 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
15011 -- Check whether entity is declared in a scope external to that of the
15014 -------------------
15015 -- Is_Outer_Type --
15016 -------------------
15018 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
15019 Scop
: Entity_Id
:= Scope
(T
);
15022 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
15026 while Scop
/= Standard_Standard
loop
15027 if Scop
= Out_Of
then
15030 Scop
:= Scope
(Scop
);
15038 -- Start of processing for Move_Freeze_Nodes
15045 -- First remove the freeze nodes that may appear before all other
15049 while Present
(Decl
)
15050 and then Nkind
(Decl
) = N_Freeze_Entity
15051 and then Is_Outer_Type
(Entity
(Decl
))
15053 Decl
:= Remove_Head
(L
);
15054 Insert_After
(Next_Node
, Decl
);
15055 Set_Analyzed
(Decl
, False);
15060 -- Next scan the list of declarations and remove each freeze node that
15061 -- appears ahead of the current node.
15063 while Present
(Decl
) loop
15064 while Present
(Next
(Decl
))
15065 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
15066 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
15068 Next_Decl
:= Remove_Next
(Decl
);
15069 Insert_After
(Next_Node
, Next_Decl
);
15070 Set_Analyzed
(Next_Decl
, False);
15071 Next_Node
:= Next_Decl
;
15074 -- If the declaration is a nested package or concurrent type, then
15075 -- recurse. Nested generic packages will have been processed from the
15078 case Nkind
(Decl
) is
15079 when N_Package_Declaration
=>
15080 Spec
:= Specification
(Decl
);
15082 when N_Task_Type_Declaration
=>
15083 Spec
:= Task_Definition
(Decl
);
15085 when N_Protected_Type_Declaration
=>
15086 Spec
:= Protected_Definition
(Decl
);
15092 if Present
(Spec
) then
15093 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
15094 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
15099 end Move_Freeze_Nodes
;
15105 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
15107 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
15110 ------------------------
15111 -- Preanalyze_Actuals --
15112 ------------------------
15114 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
) is
15115 procedure Perform_Appropriate_Analysis
(N
: Node_Id
);
15116 -- Determine if the actuals we are analyzing come from a generic
15117 -- instantiation that is a library unit and dispatch accordingly.
15119 ----------------------------------
15120 -- Perform_Appropriate_Analysis --
15121 ----------------------------------
15123 procedure Perform_Appropriate_Analysis
(N
: Node_Id
) is
15125 -- When we have a library instantiation we cannot allow any expansion
15126 -- to occur, since there may be no place to put it. Instead, in that
15127 -- case we perform a preanalysis of the actual.
15129 if Present
(Inst
) and then Is_Compilation_Unit
(Inst
) then
15134 end Perform_Appropriate_Analysis
;
15138 Errs
: constant Nat
:= Serious_Errors_Detected
;
15143 Cur
: Entity_Id
:= Empty
;
15144 -- Current homograph of the instance name
15146 Vis
: Boolean := False;
15147 -- Saved visibility status of the current homograph
15149 -- Start of processing for Preanalyze_Actuals
15152 Assoc
:= First
(Generic_Associations
(N
));
15154 -- If the instance is a child unit, its name may hide an outer homonym,
15155 -- so make it invisible to perform name resolution on the actuals.
15157 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
15159 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
15161 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
15163 if Is_Compilation_Unit
(Cur
) then
15164 Vis
:= Is_Immediately_Visible
(Cur
);
15165 Set_Is_Immediately_Visible
(Cur
, False);
15171 while Present
(Assoc
) loop
15172 if Nkind
(Assoc
) /= N_Others_Choice
then
15173 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
15175 -- Within a nested instantiation, a defaulted actual is an empty
15176 -- association, so nothing to analyze. If the subprogram actual
15177 -- is an attribute, analyze prefix only, because actual is not a
15178 -- complete attribute reference.
15180 -- If actual is an allocator, analyze expression only. The full
15181 -- analysis can generate code, and if instance is a compilation
15182 -- unit we have to wait until the package instance is installed
15183 -- to have a proper place to insert this code.
15185 -- String literals may be operators, but at this point we do not
15186 -- know whether the actual is a formal subprogram or a string.
15191 elsif Nkind
(Act
) = N_Attribute_Reference
then
15192 Perform_Appropriate_Analysis
(Prefix
(Act
));
15194 elsif Nkind
(Act
) = N_Explicit_Dereference
then
15195 Perform_Appropriate_Analysis
(Prefix
(Act
));
15197 elsif Nkind
(Act
) = N_Allocator
then
15199 Expr
: constant Node_Id
:= Expression
(Act
);
15202 if Nkind
(Expr
) = N_Subtype_Indication
then
15203 Perform_Appropriate_Analysis
(Subtype_Mark
(Expr
));
15205 -- Analyze separately each discriminant constraint, when
15206 -- given with a named association.
15212 Constr
:= First
(Constraints
(Constraint
(Expr
)));
15213 while Present
(Constr
) loop
15214 if Nkind
(Constr
) = N_Discriminant_Association
then
15215 Perform_Appropriate_Analysis
15216 (Expression
(Constr
));
15218 Perform_Appropriate_Analysis
(Constr
);
15226 Perform_Appropriate_Analysis
(Expr
);
15230 elsif Nkind
(Act
) /= N_Operator_Symbol
then
15231 Perform_Appropriate_Analysis
(Act
);
15233 -- Within a package instance, mark actuals that are limited
15234 -- views, so their use can be moved to the body of the
15237 if Is_Entity_Name
(Act
)
15238 and then Is_Type
(Entity
(Act
))
15239 and then From_Limited_With
(Entity
(Act
))
15240 and then Present
(Inst
)
15242 Append_Elmt
(Entity
(Act
), Incomplete_Actuals
(Inst
));
15246 if Errs
/= Serious_Errors_Detected
then
15248 -- Do a minimal analysis of the generic, to prevent spurious
15249 -- warnings complaining about the generic being unreferenced,
15250 -- before abandoning the instantiation.
15252 Perform_Appropriate_Analysis
(Name
(N
));
15254 if Is_Entity_Name
(Name
(N
))
15255 and then Etype
(Name
(N
)) /= Any_Type
15257 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
15258 Set_Is_Instantiated
(Entity
(Name
(N
)));
15261 if Present
(Cur
) then
15263 -- For the case of a child instance hiding an outer homonym,
15264 -- provide additional warning which might explain the error.
15266 Set_Is_Immediately_Visible
(Cur
, Vis
);
15268 ("& hides outer unit with the same name??",
15269 N
, Defining_Unit_Name
(N
));
15272 Abandon_Instantiation
(Act
);
15279 if Present
(Cur
) then
15280 Set_Is_Immediately_Visible
(Cur
, Vis
);
15282 end Preanalyze_Actuals
;
15284 -------------------------------
15285 -- Provide_Completing_Bodies --
15286 -------------------------------
15288 procedure Provide_Completing_Bodies
(N
: Node_Id
) is
15289 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
);
15290 -- Generate the completing body for subprogram declaration Subp_Decl
15292 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
);
15293 -- Generating completing bodies for all subprograms found in declarative
15296 ---------------------------
15297 -- Build_Completing_Body --
15298 ---------------------------
15300 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
) is
15301 Loc
: constant Source_Ptr
:= Sloc
(Subp_Decl
);
15302 Subp_Id
: constant Entity_Id
:= Defining_Entity
(Subp_Decl
);
15306 -- Nothing to do if the subprogram already has a completing body
15308 if Present
(Corresponding_Body
(Subp_Decl
)) then
15311 -- Mark the function as having a valid return statement even though
15312 -- the body contains a single raise statement.
15314 elsif Ekind
(Subp_Id
) = E_Function
then
15315 Set_Return_Present
(Subp_Id
);
15318 -- Clone the specification to obtain new entities and reset the only
15321 Spec
:= Copy_Subprogram_Spec
(Specification
(Subp_Decl
));
15322 Set_Generic_Parent
(Spec
, Empty
);
15325 -- function Func ... return ... is
15327 -- procedure Proc ... is
15329 -- raise Program_Error with "access before elaboration";
15332 Insert_After_And_Analyze
(Subp_Decl
,
15333 Make_Subprogram_Body
(Loc
,
15334 Specification
=> Spec
,
15335 Declarations
=> New_List
,
15336 Handled_Statement_Sequence
=>
15337 Make_Handled_Sequence_Of_Statements
(Loc
,
15338 Statements
=> New_List
(
15339 Make_Raise_Program_Error
(Loc
,
15340 Reason
=> PE_Access_Before_Elaboration
)))));
15341 end Build_Completing_Body
;
15343 ----------------------------------
15344 -- Provide_Completing_Bodies_In --
15345 ----------------------------------
15347 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
) is
15351 if Present
(Decls
) then
15352 Decl
:= First
(Decls
);
15353 while Present
(Decl
) loop
15354 Provide_Completing_Bodies
(Decl
);
15358 end Provide_Completing_Bodies_In
;
15364 -- Start of processing for Provide_Completing_Bodies
15367 if Nkind
(N
) = N_Package_Declaration
then
15368 Spec
:= Specification
(N
);
15370 Push_Scope
(Defining_Entity
(N
));
15371 Provide_Completing_Bodies_In
(Visible_Declarations
(Spec
));
15372 Provide_Completing_Bodies_In
(Private_Declarations
(Spec
));
15375 elsif Nkind
(N
) = N_Subprogram_Declaration
then
15376 Build_Completing_Body
(N
);
15378 end Provide_Completing_Bodies
;
15380 -------------------
15381 -- Remove_Parent --
15382 -------------------
15384 procedure Remove_Parent
(In_Body
: Boolean := False) is
15385 S
: Entity_Id
:= Current_Scope
;
15386 -- S is the scope containing the instantiation just completed. The scope
15387 -- stack contains the parent instances of the instantiation, followed by
15396 -- After child instantiation is complete, remove from scope stack the
15397 -- extra copy of the current scope, and then remove parent instances.
15399 if not In_Body
then
15402 while Current_Scope
/= S
loop
15403 P
:= Current_Scope
;
15404 End_Package_Scope
(Current_Scope
);
15406 if In_Open_Scopes
(P
) then
15407 E
:= First_Entity
(P
);
15408 while Present
(E
) loop
15409 Set_Is_Immediately_Visible
(E
, True);
15413 -- If instantiation is declared in a block, it is the enclosing
15414 -- scope that might be a parent instance. Note that only one
15415 -- block can be involved, because the parent instances have
15416 -- been installed within it.
15418 if Ekind
(P
) = E_Block
then
15419 Cur_P
:= Scope
(P
);
15424 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
15425 -- We are within an instance of some sibling. Retain
15426 -- visibility of parent, for proper subsequent cleanup, and
15427 -- reinstall private declarations as well.
15429 Set_In_Private_Part
(P
);
15430 Install_Private_Declarations
(P
);
15433 -- If the ultimate parent is a top-level unit recorded in
15434 -- Instance_Parent_Unit, then reset its visibility to what it was
15435 -- before instantiation. (It's not clear what the purpose is of
15436 -- testing whether Scope (P) is In_Open_Scopes, but that test was
15437 -- present before the ultimate parent test was added.???)
15439 elsif not In_Open_Scopes
(Scope
(P
))
15440 or else (P
= Instance_Parent_Unit
15441 and then not Parent_Unit_Visible
)
15443 Set_Is_Immediately_Visible
(P
, False);
15445 -- If the current scope is itself an instantiation of a generic
15446 -- nested within P, and we are in the private part of body of this
15447 -- instantiation, restore the full views of P, that were removed
15448 -- in End_Package_Scope above. This obscure case can occur when a
15449 -- subunit of a generic contains an instance of a child unit of
15450 -- its generic parent unit.
15452 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
)
15453 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
15456 Par
: constant Entity_Id
:=
15457 Generic_Parent
(Package_Specification
(S
));
15460 and then P
= Scope
(Par
)
15462 Set_In_Private_Part
(P
);
15463 Install_Private_Declarations
(P
);
15469 -- Reset visibility of entities in the enclosing scope
15471 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
15473 Hidden
:= First_Elmt
(Hidden_Entities
);
15474 while Present
(Hidden
) loop
15475 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
15476 Next_Elmt
(Hidden
);
15480 -- Each body is analyzed separately, and there is no context that
15481 -- needs preserving from one body instance to the next, so remove all
15482 -- parent scopes that have been installed.
15484 while Present
(S
) loop
15485 End_Package_Scope
(S
);
15486 Set_Is_Immediately_Visible
(S
, False);
15487 S
:= Current_Scope
;
15488 exit when S
= Standard_Standard
;
15493 -----------------------------------
15494 -- Requires_Conformance_Checking --
15495 -----------------------------------
15497 function Requires_Conformance_Checking
(N
: Node_Id
) return Boolean is
15499 -- No conformance checking required if the generic actual part is empty,
15500 -- or is a box or an others_clause (necessarily with a box).
15502 return Present
(Generic_Associations
(N
))
15503 and then not Box_Present
(N
)
15504 and then Nkind
(First
(Generic_Associations
(N
))) /= N_Others_Choice
;
15505 end Requires_Conformance_Checking
;
15511 procedure Restore_Env
is
15512 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
15515 if No
(Current_Instantiated_Parent
.Act_Id
) then
15516 -- Restore environment after subprogram inlining
15518 Restore_Private_Views
(Empty
);
15521 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
15522 Exchanged_Views
:= Saved
.Exchanged_Views
;
15523 Hidden_Entities
:= Saved
.Hidden_Entities
;
15524 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
15525 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
15526 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
15528 Restore_Config_Switches
(Saved
.Switches
);
15530 Instance_Envs
.Decrement_Last
;
15533 ---------------------------
15534 -- Restore_Private_Views --
15535 ---------------------------
15537 procedure Restore_Private_Views
15538 (Pack_Id
: Entity_Id
;
15539 Is_Package
: Boolean := True)
15544 Dep_Elmt
: Elmt_Id
;
15547 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
15548 -- Hide the generic formals of formal packages declared with box which
15549 -- were reachable in the current instantiation.
15551 ---------------------------
15552 -- Restore_Nested_Formal --
15553 ---------------------------
15555 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
15556 pragma Assert
(Ekind
(Formal
) = E_Package
);
15559 if Present
(Renamed_Entity
(Formal
))
15560 and then Denotes_Formal_Package
(Renamed_Entity
(Formal
), True)
15564 elsif Present
(Associated_Formal_Package
(Formal
)) then
15565 Ent
:= First_Entity
(Formal
);
15566 while Present
(Ent
) loop
15567 exit when Ekind
(Ent
) = E_Package
15568 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
15570 Set_Is_Hidden
(Ent
);
15571 Set_Is_Potentially_Use_Visible
(Ent
, False);
15573 -- If package, then recurse
15575 if Ekind
(Ent
) = E_Package
then
15576 Restore_Nested_Formal
(Ent
);
15582 end Restore_Nested_Formal
;
15584 -- Start of processing for Restore_Private_Views
15587 M
:= First_Elmt
(Exchanged_Views
);
15588 while Present
(M
) loop
15591 -- Subtypes of types whose views have been exchanged, and that are
15592 -- defined within the instance, were not on the Private_Dependents
15593 -- list on entry to the instance, so they have to be exchanged
15594 -- explicitly now, in order to remain consistent with the view of the
15597 if Ekind
(Typ
) in E_Private_Type
15598 | E_Limited_Private_Type
15599 | E_Record_Type_With_Private
15601 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
15602 while Present
(Dep_Elmt
) loop
15603 Dep_Typ
:= Node
(Dep_Elmt
);
15605 if Scope
(Dep_Typ
) = Pack_Id
15606 and then Present
(Full_View
(Dep_Typ
))
15608 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
15609 Exchange_Declarations
(Dep_Typ
);
15612 Next_Elmt
(Dep_Elmt
);
15616 Exchange_Declarations
(Typ
);
15620 if No
(Pack_Id
) then
15624 -- Make the generic formal parameters private, and make the formal types
15625 -- into subtypes of the actuals again.
15627 E
:= First_Entity
(Pack_Id
);
15628 while Present
(E
) loop
15629 Set_Is_Hidden
(E
, True);
15632 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
15634 -- Always preserve the flag Is_Generic_Actual_Type for GNATprove,
15635 -- as it is needed to identify the subtype with the type it
15636 -- renames, when there are conversions between access types
15639 if GNATprove_Mode
then
15642 -- If the actual for E is itself a generic actual type from
15643 -- an enclosing instance, E is still a generic actual type
15644 -- outside of the current instance. This matter when resolving
15645 -- an overloaded call that may be ambiguous in the enclosing
15646 -- instance, when two of its actuals coincide.
15648 elsif Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
15649 and then Is_Generic_Actual_Type
15650 (Entity
(Subtype_Indication
(Parent
(E
))))
15654 Set_Is_Generic_Actual_Type
(E
, False);
15656 -- It might seem reasonable to clear the Is_Generic_Actual_Type
15657 -- flag also on the Full_View if the type is private, since it
15658 -- was set also on this Full_View. However, this flag is relied
15659 -- upon by Covers to spot "types exported from instantiations"
15660 -- which are implicit Full_Views built for instantiations made
15661 -- on private types and we get type mismatches if we do it when
15662 -- the block exchanging the declarations below triggers ???
15664 -- if Is_Private_Type (E) and then Present (Full_View (E)) then
15665 -- Set_Is_Generic_Actual_Type (Full_View (E), False);
15669 -- An unusual case of aliasing: the actual may also be directly
15670 -- visible in the generic, and be private there, while it is fully
15671 -- visible in the context of the instance. The internal subtype
15672 -- is private in the instance but has full visibility like its
15673 -- parent in the enclosing scope. This enforces the invariant that
15674 -- the privacy status of all private dependents of a type coincide
15675 -- with that of the parent type. This can only happen when a
15676 -- generic child unit is instantiated within a sibling.
15678 if Is_Private_Type
(E
)
15679 and then not Is_Private_Type
(Etype
(E
))
15681 Exchange_Declarations
(E
);
15684 elsif Ekind
(E
) = E_Package
then
15686 -- The end of the renaming list is the renaming of the generic
15687 -- package itself. If the instance is a subprogram, all entities
15688 -- in the corresponding package are renamings. If this entity is
15689 -- a formal package, make its own formals private as well. The
15690 -- actual in this case is itself the renaming of an instantiation.
15691 -- If the entity is not a package renaming, it is the entity
15692 -- created to validate formal package actuals: ignore it.
15694 -- If the actual is itself a formal package for the enclosing
15695 -- generic, or the actual for such a formal package, it remains
15696 -- visible on exit from the instance, and therefore nothing needs
15697 -- to be done either, except to keep it accessible.
15699 if Is_Package
and then Renamed_Entity
(E
) = Pack_Id
then
15702 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
15706 Denotes_Formal_Package
(Renamed_Entity
(E
), True, Pack_Id
)
15708 Set_Is_Hidden
(E
, False);
15712 Act_P
: constant Entity_Id
:= Renamed_Entity
(E
);
15716 Id
:= First_Entity
(Act_P
);
15718 and then Id
/= First_Private_Entity
(Act_P
)
15720 exit when Ekind
(Id
) = E_Package
15721 and then Renamed_Entity
(Id
) = Act_P
;
15723 Set_Is_Hidden
(Id
, True);
15724 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
15726 if Ekind
(Id
) = E_Package
then
15727 Restore_Nested_Formal
(Id
);
15738 end Restore_Private_Views
;
15745 (Gen_Unit
: Entity_Id
;
15746 Act_Unit
: Entity_Id
)
15750 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
15753 ----------------------------
15754 -- Save_Global_References --
15755 ----------------------------
15757 procedure Save_Global_References
(Templ
: Node_Id
) is
15759 -- ??? it is horrible to use global variables in highly recursive code
15762 -- The entity of the current associated node
15764 Gen_Scope
: Entity_Id
;
15765 -- The scope of the generic for which references are being saved
15768 -- The current associated node
15770 function Is_Global
(E
: Entity_Id
) return Boolean;
15771 -- Check whether entity is defined outside of generic unit. Examine the
15772 -- scope of an entity, and the scope of the scope, etc, until we find
15773 -- either Standard, in which case the entity is global, or the generic
15774 -- unit itself, which indicates that the entity is local. If the entity
15775 -- is the generic unit itself, as in the case of a recursive call, or
15776 -- the enclosing generic unit, if different from the current scope, then
15777 -- it is local as well, because it will be replaced at the point of
15778 -- instantiation. On the other hand, if it is a reference to a child
15779 -- unit of a common ancestor, which appears in an instantiation, it is
15780 -- global because it is used to denote a specific compilation unit at
15781 -- the time the instantiations will be analyzed.
15783 procedure Qualify_Universal_Operands
15785 Func_Call
: Node_Id
);
15786 -- Op denotes a binary or unary operator in generic template Templ. Node
15787 -- Func_Call is the function call alternative of the operator within the
15788 -- the analyzed copy of the template. Change each operand which yields a
15789 -- universal type by wrapping it into a qualified expression
15791 -- Actual_Typ'(Operand)
15793 -- where Actual_Typ is the type of corresponding actual parameter of
15794 -- Operand in Func_Call.
15796 procedure Reset_Entity
(N
: Node_Id
);
15797 -- Save semantic information on global entity so that it is not resolved
15798 -- again at instantiation time.
15800 procedure Save_Entity_Descendants
(N
: Node_Id
);
15801 -- Apply Save_Global_References to the two syntactic descendants of
15802 -- non-terminal nodes that carry an Associated_Node and are processed
15803 -- through Reset_Entity. Once the global entity (if any) has been
15804 -- captured together with its type, only two syntactic descendants need
15805 -- to be traversed to complete the processing of the tree rooted at N.
15806 -- This applies to Selected_Components, Expanded_Names, and to Operator
15807 -- nodes. N can also be a character literal, identifier, or operator
15808 -- symbol node, but the call has no effect in these cases.
15810 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
);
15811 -- Default actuals in nested instances must be handled specially
15812 -- because there is no link to them from the original tree. When an
15813 -- actual subprogram is given by a default, we add an explicit generic
15814 -- association for it in the instantiation node. When we save the
15815 -- global references on the name of the instance, we recover the list
15816 -- of generic associations, and add an explicit one to the original
15817 -- generic tree, through which a global actual can be preserved.
15818 -- Similarly, if a child unit is instantiated within a sibling, in the
15819 -- context of the parent, we must preserve the identifier of the parent
15820 -- so that it can be properly resolved in a subsequent instantiation.
15822 procedure Save_Global_Descendant
(D
: Union_Id
);
15823 -- Apply Save_References recursively to the descendants of node D
15825 procedure Save_References
(N
: Node_Id
);
15826 -- This is the recursive procedure that does the work, once the
15827 -- enclosing generic scope has been established.
15829 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
15830 -- If the type of N2 is global to the generic unit, save the type in
15831 -- the generic node. Just as we perform name capture for explicit
15832 -- references within the generic, we must capture the global types
15833 -- of local entities because they may participate in resolution in
15840 function Is_Global
(E
: Entity_Id
) return Boolean is
15843 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
15844 -- Determine whether the parent node of a reference to a child unit
15845 -- denotes an instantiation or a formal package, in which case the
15846 -- reference to the child unit is global, even if it appears within
15847 -- the current scope (e.g. when the instance appears within the body
15848 -- of an ancestor).
15850 ----------------------
15851 -- Is_Instance_Node --
15852 ----------------------
15854 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
15856 return Nkind
(Decl
) in N_Generic_Instantiation
15858 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
15859 end Is_Instance_Node
;
15861 -- Start of processing for Is_Global
15864 if E
= Gen_Scope
then
15867 elsif E
= Standard_Standard
then
15870 -- E should be an entity, but it is not always
15872 elsif Nkind
(E
) not in N_Entity
then
15875 elsif Nkind
(E
) /= N_Expanded_Name
15876 and then Is_Child_Unit
(E
)
15877 and then (Is_Instance_Node
(Parent
(N2
))
15878 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
15879 and then N2
= Selector_Name
(Parent
(N2
))
15881 Is_Instance_Node
(Parent
(Parent
(N2
)))))
15886 -- E may be an expanded name - typically an operator - in which
15887 -- case we must find its enclosing scope since expanded names
15888 -- don't have corresponding scopes.
15890 if Nkind
(E
) = N_Expanded_Name
then
15891 Se
:= Find_Enclosing_Scope
(E
);
15893 -- Otherwise, E is an entity and will have Scope set
15899 while Se
/= Gen_Scope
loop
15900 if Se
= Standard_Standard
then
15911 --------------------------------
15912 -- Qualify_Universal_Operands --
15913 --------------------------------
15915 procedure Qualify_Universal_Operands
15917 Func_Call
: Node_Id
)
15919 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
);
15920 -- Rewrite operand Opnd as a qualified expression of the form
15922 -- Actual_Typ'(Opnd)
15924 -- where Actual is the corresponding actual parameter of Opnd in
15925 -- function call Func_Call.
15927 function Qualify_Type
15929 Typ
: Entity_Id
) return Node_Id
;
15930 -- Qualify type Typ by creating a selected component of the form
15932 -- Scope_Of_Typ.Typ
15934 ---------------------
15935 -- Qualify_Operand --
15936 ---------------------
15938 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
) is
15939 Loc
: constant Source_Ptr
:= Sloc
(Opnd
);
15940 Typ
: constant Entity_Id
:= Etype
(Actual
);
15945 -- Qualify the operand when it is of a universal type. Note that
15946 -- the template is unanalyzed and it is not possible to directly
15947 -- query the type. This transformation is not done when the type
15948 -- of the actual is internally generated because the type will be
15949 -- regenerated in the instance.
15951 if Yields_Universal_Type
(Opnd
)
15952 and then Comes_From_Source
(Typ
)
15953 and then not Is_Hidden
(Typ
)
15955 -- The type of the actual may be a global reference. Save this
15956 -- information by creating a reference to it.
15958 if Is_Global
(Typ
) then
15959 Mark
:= New_Occurrence_Of
(Typ
, Loc
);
15961 -- Otherwise rely on resolution to find the proper type within
15965 Mark
:= Qualify_Type
(Loc
, Typ
);
15969 Make_Qualified_Expression
(Loc
,
15970 Subtype_Mark
=> Mark
,
15971 Expression
=> Relocate_Node
(Opnd
));
15973 -- Mark the qualification to distinguish it from other source
15974 -- constructs and signal the instantiation mechanism that this
15975 -- node requires special processing. See Copy_Generic_Node for
15978 Set_Is_Qualified_Universal_Literal
(Qual
);
15980 Rewrite
(Opnd
, Qual
);
15982 end Qualify_Operand
;
15988 function Qualify_Type
15990 Typ
: Entity_Id
) return Node_Id
15992 Scop
: constant Entity_Id
:= Scope
(Typ
);
15996 Result
:= Make_Identifier
(Loc
, Chars
(Typ
));
15998 if Present
(Scop
) and then not Is_Generic_Unit
(Scop
) then
16000 Make_Selected_Component
(Loc
,
16001 Prefix
=> Make_Identifier
(Loc
, Chars
(Scop
)),
16002 Selector_Name
=> Result
);
16010 Actuals
: constant List_Id
:= Parameter_Associations
(Func_Call
);
16012 -- Start of processing for Qualify_Universal_Operands
16015 if Nkind
(Op
) in N_Binary_Op
then
16016 Qualify_Operand
(Left_Opnd
(Op
), First
(Actuals
));
16017 Qualify_Operand
(Right_Opnd
(Op
), Next
(First
(Actuals
)));
16019 elsif Nkind
(Op
) in N_Unary_Op
then
16020 Qualify_Operand
(Right_Opnd
(Op
), First
(Actuals
));
16022 end Qualify_Universal_Operands
;
16028 procedure Reset_Entity
(N
: Node_Id
) is
16029 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
16030 -- Find the ultimate ancestor of the current unit. If it is not a
16031 -- generic unit, then the name of the current unit in the prefix of
16032 -- an expanded name must be replaced with its generic homonym to
16033 -- ensure that it will be properly resolved in an instance.
16039 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
16044 while Is_Child_Unit
(Par
) loop
16045 Par
:= Scope
(Par
);
16051 -- Start of processing for Reset_Entity
16054 N2
:= Get_Associated_Node
(N
);
16057 if Present
(E
) then
16059 -- If the node is an entry call to an entry in an enclosing task,
16060 -- it is rewritten as a selected component. No global entity to
16061 -- preserve in this case, since the expansion will be redone in
16064 if Nkind
(E
) not in N_Entity
then
16065 Set_Associated_Node
(N
, Empty
);
16066 Set_Etype
(N
, Empty
);
16070 -- If the entity is an itype created as a subtype of an access
16071 -- type with a null exclusion restore source entity for proper
16072 -- visibility. The itype will be created anew in the instance.
16075 and then Ekind
(E
) = E_Access_Subtype
16076 and then Is_Entity_Name
(N
)
16077 and then Chars
(Etype
(E
)) = Chars
(N
)
16080 Set_Entity
(N2
, E
);
16084 if Is_Global
(E
) then
16085 Set_Global_Type
(N
, N2
);
16087 elsif Nkind
(N
) = N_Op_Concat
16088 and then Is_Generic_Type
(Etype
(N2
))
16089 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
16091 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
16092 and then Is_Intrinsic_Subprogram
(E
)
16096 -- Entity is local. Mark generic node as unresolved. Note that now
16097 -- it does not have an entity.
16100 Set_Associated_Node
(N
, Empty
);
16101 Set_Etype
(N
, Empty
);
16104 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
16105 and then N
= Name
(Parent
(N
))
16107 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
16110 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16111 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
16113 -- In case of previous errors, the tree might be malformed
16115 if No
(Entity
(Parent
(N2
))) then
16118 elsif Is_Global
(Entity
(Parent
(N2
))) then
16119 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16120 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
16121 Set_Global_Type
(Parent
(N
), Parent
(N2
));
16122 Save_Entity_Descendants
(N
);
16124 -- If this is a reference to the current generic entity, replace
16125 -- by the name of the generic homonym of the current package. This
16126 -- is because in an instantiation Par.P.Q will not resolve to the
16127 -- name of the instance, whose enclosing scope is not necessarily
16128 -- Par. We use the generic homonym rather that the name of the
16129 -- generic itself because it may be hidden by a local declaration.
16131 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
16133 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
16135 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
16136 Rewrite
(Parent
(N
),
16137 Make_Identifier
(Sloc
(N
),
16139 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
16141 Rewrite
(Parent
(N
),
16142 Make_Identifier
(Sloc
(N
),
16143 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
16147 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
16148 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
16150 Save_Global_Defaults
16151 (Parent
(Parent
(N
)), Parent
(Parent
(N2
)));
16154 -- A selected component may denote a static constant that has been
16155 -- folded. If the static constant is global to the generic, capture
16156 -- its value. Otherwise the folding will happen in any instantiation.
16158 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16159 and then Nkind
(Parent
(N2
)) in N_Integer_Literal | N_Real_Literal
16161 if Present
(Entity
(Original_Node
(Parent
(N2
))))
16162 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
16164 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
16165 Set_Analyzed
(Parent
(N
), False);
16168 -- A selected component may be transformed into a parameterless
16169 -- function call. If the called entity is global, rewrite the node
16170 -- appropriately, i.e. as an extended name for the global entity.
16172 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16173 and then Nkind
(Parent
(N2
)) = N_Function_Call
16174 and then N
= Selector_Name
(Parent
(N
))
16176 if No
(Parameter_Associations
(Parent
(N2
))) then
16177 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
16178 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16179 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
16180 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
16181 Save_Entity_Descendants
(N
);
16184 Set_Is_Prefixed_Call
(Parent
(N
));
16185 Set_Associated_Node
(N
, Empty
);
16186 Set_Etype
(N
, Empty
);
16189 -- In Ada 2005, X.F may be a call to a primitive operation,
16190 -- rewritten as F (X). This rewriting will be done again in an
16191 -- instance, so keep the original node. Global entities will be
16192 -- captured as for other constructs. Indicate that this must
16193 -- resolve as a call, to prevent accidental overloading in the
16194 -- instance, if both a component and a primitive operation appear
16198 Set_Is_Prefixed_Call
(Parent
(N
));
16201 -- Entity is local. Reset in generic unit, so that node is resolved
16202 -- anew at the point of instantiation.
16205 Set_Associated_Node
(N
, Empty
);
16206 Set_Etype
(N
, Empty
);
16210 -----------------------------
16211 -- Save_Entity_Descendants --
16212 -----------------------------
16214 procedure Save_Entity_Descendants
(N
: Node_Id
) is
16217 when N_Binary_Op
=>
16218 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
16219 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16222 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16224 when N_Expanded_Name
16225 | N_Selected_Component
16227 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
16228 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
16230 when N_Character_Literal
16232 | N_Operator_Symbol
16237 raise Program_Error
;
16239 end Save_Entity_Descendants
;
16241 --------------------------
16242 -- Save_Global_Defaults --
16243 --------------------------
16245 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
) is
16246 Loc
: constant Source_Ptr
:= Sloc
(N1
);
16247 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
16248 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
16255 Actual
: Entity_Id
;
16258 Assoc1
:= Generic_Associations
(N1
);
16260 if Present
(Assoc1
) then
16261 Act1
:= First
(Assoc1
);
16264 Set_Generic_Associations
(N1
, New_List
);
16265 Assoc1
:= Generic_Associations
(N1
);
16268 if Present
(Assoc2
) then
16269 Act2
:= First
(Assoc2
);
16274 while Present
(Act1
) and then Present
(Act2
) loop
16279 -- Find the associations added for default subprograms
16281 if Present
(Act2
) then
16282 while Nkind
(Act2
) /= N_Generic_Association
16283 or else No
(Entity
(Selector_Name
(Act2
)))
16284 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
16289 -- Add a similar association if the default is global. The
16290 -- renaming declaration for the actual has been analyzed, and
16291 -- its alias is the program it renames. Link the actual in the
16292 -- original generic tree with the node in the analyzed tree.
16294 while Present
(Act2
) loop
16295 Subp
:= Entity
(Selector_Name
(Act2
));
16296 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
16298 -- Following test is defence against rubbish errors
16300 if No
(Alias
(Subp
)) then
16304 -- Retrieve the resolved actual from the renaming declaration
16305 -- created for the instantiated formal.
16307 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
16308 Set_Entity
(Def
, Actual
);
16309 Set_Etype
(Def
, Etype
(Actual
));
16311 if Is_Global
(Actual
) then
16313 Make_Generic_Association
(Loc
,
16315 New_Occurrence_Of
(Subp
, Loc
),
16316 Explicit_Generic_Actual_Parameter
=>
16317 New_Occurrence_Of
(Actual
, Loc
));
16319 Set_Associated_Node
16320 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
16322 Append
(Ndec
, Assoc1
);
16324 -- If there are other defaults, add a dummy association in case
16325 -- there are other defaulted formals with the same name.
16327 elsif Present
(Next
(Act2
)) then
16329 Make_Generic_Association
(Loc
,
16331 New_Occurrence_Of
(Subp
, Loc
),
16332 Explicit_Generic_Actual_Parameter
=> Empty
);
16334 Append
(Ndec
, Assoc1
);
16341 if Nkind
(Name
(N1
)) = N_Identifier
16342 and then Is_Child_Unit
(Gen_Id
)
16343 and then Is_Global
(Gen_Id
)
16344 and then Is_Generic_Unit
(Scope
(Gen_Id
))
16345 and then In_Open_Scopes
(Scope
(Gen_Id
))
16347 -- This is an instantiation of a child unit within a sibling, so
16348 -- that the generic parent is in scope. An eventual instance must
16349 -- occur within the scope of an instance of the parent. Make name
16350 -- in instance into an expanded name, to preserve the identifier
16351 -- of the parent, so it can be resolved subsequently.
16353 Rewrite
(Name
(N2
),
16354 Make_Expanded_Name
(Loc
,
16355 Chars
=> Chars
(Gen_Id
),
16356 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16357 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16358 Set_Entity
(Name
(N2
), Gen_Id
);
16360 Rewrite
(Name
(N1
),
16361 Make_Expanded_Name
(Loc
,
16362 Chars
=> Chars
(Gen_Id
),
16363 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16364 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16366 Set_Associated_Node
(Name
(N1
), Name
(N2
));
16367 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
16368 Set_Associated_Node
16369 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
16370 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
16372 end Save_Global_Defaults
;
16374 ----------------------------
16375 -- Save_Global_Descendant --
16376 ----------------------------
16378 procedure Save_Global_Descendant
(D
: Union_Id
) is
16382 if D
in Node_Range
then
16383 if D
= Union_Id
(Empty
) then
16386 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
16387 Save_References
(Node_Id
(D
));
16390 elsif D
in List_Range
then
16391 pragma Assert
(D
/= Union_Id
(No_List
));
16392 -- Because No_List = Empty, which is in Node_Range above
16394 N1
:= First
(List_Id
(D
));
16395 while Present
(N1
) loop
16396 Save_References
(N1
);
16400 -- Element list or other non-node field, nothing to do
16405 end Save_Global_Descendant
;
16407 ---------------------
16408 -- Save_References --
16409 ---------------------
16411 -- This is the recursive procedure that does the work once the enclosing
16412 -- generic scope has been established. We have to treat specially a
16413 -- number of node rewritings that are required by semantic processing
16414 -- and which change the kind of nodes in the generic copy: typically
16415 -- constant-folding, replacing an operator node by a string literal, or
16416 -- a selected component by an expanded name. In each of those cases, the
16417 -- transformation is propagated to the generic unit.
16419 procedure Save_References
(N
: Node_Id
) is
16420 Loc
: constant Source_Ptr
:= Sloc
(N
);
16422 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean;
16423 -- Determine whether arbitrary node Nod requires delayed capture of
16424 -- global references within its aspect specifications.
16426 procedure Save_References_In_Aggregate
(N
: Node_Id
);
16427 -- Save all global references in [extension] aggregate node N
16429 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
);
16430 -- Save all global references in a character literal or operator
16431 -- symbol denoted by N.
16433 procedure Save_References_In_Descendants
(N
: Node_Id
);
16434 -- Save all global references in all descendants of node N
16436 procedure Save_References_In_Identifier
(N
: Node_Id
);
16437 -- Save all global references in identifier node N
16439 procedure Save_References_In_Operator
(N
: Node_Id
);
16440 -- Save all global references in operator node N
16442 procedure Save_References_In_Pragma
(Prag
: Node_Id
);
16443 -- Save all global references found within the expression of pragma
16446 ---------------------------
16447 -- Requires_Delayed_Save --
16448 ---------------------------
16450 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean is
16452 -- Generic packages and subprograms require delayed capture of
16453 -- global references within their aspects due to the timing of
16454 -- annotation analysis.
16456 if Nkind
(Nod
) in N_Generic_Package_Declaration
16457 | N_Generic_Subprogram_Declaration
16459 | N_Package_Body_Stub
16460 | N_Subprogram_Body
16461 | N_Subprogram_Body_Stub
16463 -- Since the capture of global references is done on the
16464 -- unanalyzed generic template, there is no information around
16465 -- to infer the context. Use the Associated_Entity linkages to
16466 -- peek into the analyzed generic copy and determine what the
16467 -- template corresponds to.
16469 if Nod
= Templ
then
16471 Is_Generic_Declaration_Or_Body
16472 (Unit_Declaration_Node
16473 (Get_Associated_Entity
(Defining_Entity
(Nod
))));
16475 -- Otherwise the generic unit being processed is not the top
16476 -- level template. It is safe to capture of global references
16477 -- within the generic unit because at this point the top level
16478 -- copy is fully analyzed.
16484 -- Otherwise capture the global references without interference
16489 end Requires_Delayed_Save
;
16491 ----------------------------------
16492 -- Save_References_In_Aggregate --
16493 ----------------------------------
16495 procedure Save_References_In_Aggregate
(N
: Node_Id
) is
16497 Qual
: Node_Id
:= Empty
;
16498 Typ
: Entity_Id
:= Empty
;
16501 N2
:= Get_Associated_Node
(N
);
16503 if Present
(N2
) then
16506 -- In an instance within a generic, use the name of the actual
16507 -- and not the original generic parameter. If the actual is
16508 -- global in the current generic it must be preserved for its
16511 if Parent_Kind
(Typ
) = N_Subtype_Declaration
16512 and then Present
(Generic_Parent_Type
(Parent
(Typ
)))
16514 Typ
:= Base_Type
(Typ
);
16515 Set_Etype
(N2
, Typ
);
16519 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
16520 Set_Associated_Node
(N
, Empty
);
16522 -- For a full aggregate, if the type is local but is a derived
16523 -- tagged type of a global ancestor, we will need to have the
16524 -- full view of this global ancestor available in the instance
16525 -- in order to analyze the full aggregate.
16528 and then Nkind
(N2
) = N_Aggregate
16529 and then Present
(Typ
)
16530 and then Is_Tagged_Type
(Typ
)
16531 and then Is_Derived_Type
(Typ
)
16534 Root_Typ
: constant Entity_Id
:= Root_Type
(Typ
);
16536 Parent_Typ
: Entity_Id
:= Typ
;
16540 Parent_Typ
:= Etype
(Parent_Typ
);
16542 if Is_Global
(Parent_Typ
) then
16543 Set_Ancestor_Type
(N
, Parent_Typ
);
16547 exit when Parent_Typ
= Root_Typ
;
16552 -- If the aggregate is an actual in a call, it has been
16553 -- resolved in the current context, to some local type. The
16554 -- enclosing call may have been disambiguated by the aggregate,
16555 -- and this disambiguation might fail at instantiation time
16556 -- because the type to which the aggregate did resolve is not
16557 -- preserved. In order to preserve some of this information,
16558 -- wrap the aggregate in a qualified expression, using the id
16559 -- of its type. For further disambiguation we qualify the type
16560 -- name with its scope (if visible and not hidden by a local
16561 -- homograph) because both id's will have corresponding
16562 -- entities in an instance. This resolves most of the problems
16563 -- with missing type information on aggregates in instances.
16566 and then Nkind
(N2
) = Nkind
(N
)
16567 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
16568 and then Present
(Typ
)
16569 and then Comes_From_Source
(Typ
)
16571 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
16573 if Is_Immediately_Visible
(Scope
(Typ
))
16575 (not In_Open_Scopes
(Scope
(Typ
))
16576 or else Current_Entity
(Scope
(Typ
)) = Scope
(Typ
))
16579 Make_Selected_Component
(Loc
,
16581 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
16582 Selector_Name
=> Nam
);
16586 Make_Qualified_Expression
(Loc
,
16587 Subtype_Mark
=> Nam
,
16588 Expression
=> Relocate_Node
(N
));
16591 -- For a full aggregate, if the type is global and a derived
16592 -- tagged type, we will also need to have the full view of its
16593 -- ancestor available in the instance in order to analyze the
16597 and then Nkind
(N2
) = N_Aggregate
16598 and then Present
(Typ
)
16599 and then Is_Tagged_Type
(Typ
)
16600 and then Is_Derived_Type
(Typ
)
16602 Set_Ancestor_Type
(N
, Etype
(Typ
));
16605 if Nkind
(N
) = N_Aggregate
then
16606 Save_Global_Descendant
(Union_Id
(Aggregate_Bounds
(N
)));
16608 elsif Nkind
(N
) = N_Extension_Aggregate
then
16609 Save_Global_Descendant
(Union_Id
(Ancestor_Part
(N
)));
16612 pragma Assert
(False);
16615 Save_Global_Descendant
(Union_Id
(Expressions
(N
)));
16616 Save_Global_Descendant
(Union_Id
(Component_Associations
(N
)));
16617 Save_Global_Descendant
(Union_Id
(Etype
(N
)));
16619 if Present
(Qual
) then
16622 end Save_References_In_Aggregate
;
16624 ----------------------------------------------
16625 -- Save_References_In_Char_Lit_Or_Op_Symbol --
16626 ----------------------------------------------
16628 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
) is
16630 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16633 elsif Nkind
(N
) = N_Operator_Symbol
16634 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
16636 Change_Operator_Symbol_To_String_Literal
(N
);
16638 end Save_References_In_Char_Lit_Or_Op_Symbol
;
16640 ------------------------------------
16641 -- Save_References_In_Descendants --
16642 ------------------------------------
16644 procedure Save_References_In_Descendants
(N
: Node_Id
) is
16645 procedure Walk
is new Walk_Sinfo_Fields
(Save_Global_Descendant
);
16648 end Save_References_In_Descendants
;
16650 -----------------------------------
16651 -- Save_References_In_Identifier --
16652 -----------------------------------
16654 procedure Save_References_In_Identifier
(N
: Node_Id
) is
16656 -- The node did not undergo a transformation
16658 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16659 -- If this is a discriminant reference, always save it.
16660 -- It is used in the instance to find the corresponding
16661 -- discriminant positionally rather than by name.
16663 Set_Original_Discriminant
16664 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
16668 -- The analysis of the generic copy transformed the identifier
16669 -- into another construct. Propagate the changes to the template.
16672 N2
:= Get_Associated_Node
(N
);
16674 -- The identifier denotes a call to a parameterless function.
16675 -- Mark the node as resolved when the function is external.
16677 if Nkind
(N2
) = N_Function_Call
then
16678 E
:= Entity
(Name
(N2
));
16680 if Present
(E
) and then Is_Global
(E
) then
16681 Set_Global_Type
(N
, N2
);
16683 Set_Associated_Node
(N
, Empty
);
16684 Set_Etype
(N
, Empty
);
16687 -- The identifier denotes a named number that was constant
16688 -- folded. Preserve the original name for ASIS and undo the
16689 -- constant folding which will be repeated in the instance.
16690 -- Is this still needed???
16692 elsif Nkind
(N2
) in N_Integer_Literal | N_Real_Literal
16693 and then Is_Entity_Name
(Original_Node
(N2
))
16695 Set_Associated_Node
(N
, Original_Node
(N2
));
16698 -- The identifier resolved to a string literal. Propagate this
16699 -- information to the generic template.
16701 elsif Nkind
(N2
) = N_String_Literal
then
16702 Rewrite
(N
, New_Copy
(N2
));
16704 -- The identifier is rewritten as a dereference if it is the
16705 -- prefix of an implicit dereference. Preserve the original
16706 -- tree as the analysis of the instance will expand the node
16707 -- again, but preserve the resolved entity if it is global.
16709 elsif Nkind
(N2
) = N_Explicit_Dereference
then
16710 if Is_Entity_Name
(Prefix
(N2
))
16711 and then Present
(Entity
(Prefix
(N2
)))
16712 and then Is_Global
(Entity
(Prefix
(N2
)))
16714 Set_Associated_Node
(N
, Prefix
(N2
));
16715 Set_Global_Type
(N
, Prefix
(N2
));
16717 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
16718 and then Is_Entity_Name
(Name
(Prefix
(N2
)))
16719 and then Present
(Entity
(Name
(Prefix
(N2
))))
16720 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
16723 Make_Explicit_Dereference
(Loc
,
16725 Make_Function_Call
(Loc
,
16728 (Entity
(Name
(Prefix
(N2
))), Loc
))));
16729 Set_Associated_Node
16730 (Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
16731 Set_Global_Type
(Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
16734 Set_Associated_Node
(N
, Empty
);
16735 Set_Etype
(N
, Empty
);
16738 -- The subtype mark of a nominally unconstrained object is
16739 -- rewritten as a subtype indication using the bounds of the
16740 -- expression. Recover the original subtype mark.
16742 elsif Nkind
(N2
) = N_Subtype_Indication
16743 and then Is_Entity_Name
(Original_Node
(N2
))
16745 Set_Associated_Node
(N
, Original_Node
(N2
));
16749 end Save_References_In_Identifier
;
16751 ---------------------------------
16752 -- Save_References_In_Operator --
16753 ---------------------------------
16755 procedure Save_References_In_Operator
(N
: Node_Id
) is
16757 N2
:= Get_Associated_Node
(N
);
16759 -- The node did not undergo a transformation
16761 if Nkind
(N
) = Nkind
(N2
) then
16762 if Nkind
(N
) = N_Op_Concat
then
16763 Set_Is_Component_Left_Opnd
16764 (N
, Is_Component_Left_Opnd
(N2
));
16765 Set_Is_Component_Right_Opnd
16766 (N
, Is_Component_Right_Opnd
(N2
));
16771 -- The analysis of the generic copy transformed the operator into
16772 -- some other construct. Propagate the changes to the template if
16776 -- The operator resoved to a function call
16778 if Nkind
(N2
) = N_Function_Call
then
16780 -- Add explicit qualifications in the generic template for
16781 -- all operands of universal type. This aids resolution by
16782 -- preserving the actual type of a literal or an attribute
16783 -- that yields a universal result.
16785 Qualify_Universal_Operands
(N
, N2
);
16787 E
:= Entity
(Name
(N2
));
16789 if Present
(E
) and then Is_Global
(E
) then
16790 Set_Global_Type
(N
, N2
);
16792 Set_Associated_Node
(N
, Empty
);
16793 Set_Etype
(N
, Empty
);
16796 -- The operator was folded into a literal
16798 elsif Nkind
(N2
) in N_Integer_Literal
16802 if Present
(Original_Node
(N2
))
16803 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
16805 -- Operation was constant-folded. Whenever possible,
16806 -- recover semantic information from unfolded node.
16807 -- This was initially done for ASIS but is apparently
16808 -- needed also for e.g. compiling a-nbnbin.adb.
16810 Set_Associated_Node
(N
, Original_Node
(N2
));
16812 if Nkind
(N
) = N_Op_Concat
then
16813 Set_Is_Component_Left_Opnd
(N
,
16814 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
16815 Set_Is_Component_Right_Opnd
(N
,
16816 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
16821 -- Propagate the constant folding back to the template
16824 Rewrite
(N
, New_Copy
(N2
));
16825 Set_Analyzed
(N
, False);
16828 -- The operator was folded into an enumeration literal. Retain
16829 -- the entity to avoid spurious ambiguities if it is overloaded
16830 -- at the point of instantiation or inlining.
16832 elsif Nkind
(N2
) = N_Identifier
16833 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
16835 Rewrite
(N
, New_Copy
(N2
));
16836 Set_Analyzed
(N
, False);
16840 -- Complete the operands check if node has not been constant
16843 if Nkind
(N
) in N_Op
then
16844 Save_Entity_Descendants
(N
);
16846 end Save_References_In_Operator
;
16848 -------------------------------
16849 -- Save_References_In_Pragma --
16850 -------------------------------
16852 procedure Save_References_In_Pragma
(Prag
: Node_Id
) is
16854 Do_Save
: Boolean := True;
16857 -- Do not save global references in pragmas generated from aspects
16858 -- because the pragmas will be regenerated at instantiation time.
16860 if From_Aspect_Specification
(Prag
) then
16863 -- The capture of global references within contract-related source
16864 -- pragmas associated with generic packages, subprograms or their
16865 -- respective bodies must be delayed due to timing of annotation
16866 -- analysis. Global references are still captured in routine
16867 -- Save_Global_References_In_Contract.
16869 elsif Is_Generic_Contract_Pragma
(Prag
) and then Prag
/= Templ
then
16870 if Is_Package_Contract_Annotation
(Prag
) then
16871 Context
:= Find_Related_Package_Or_Body
(Prag
);
16873 pragma Assert
(Is_Subprogram_Contract_Annotation
(Prag
));
16874 Context
:= Find_Related_Declaration_Or_Body
(Prag
);
16877 -- The use of Original_Node accounts for the case when the
16878 -- related context is generic template.
16880 if Requires_Delayed_Save
(Original_Node
(Context
)) then
16885 -- For all other cases, save all global references within the
16886 -- descendants, but skip the following semantic fields:
16887 -- Next_Pragma, Corresponding_Aspect, Next_Rep_Item.
16890 Save_Global_Descendant
16891 (Union_Id
(Pragma_Argument_Associations
(N
)));
16892 Save_Global_Descendant
(Union_Id
(Pragma_Identifier
(N
)));
16894 end Save_References_In_Pragma
;
16896 -- Start of processing for Save_References
16904 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
16905 Save_References_In_Aggregate
(N
);
16907 -- Character literals, operator symbols
16909 elsif Nkind
(N
) in N_Character_Literal | N_Operator_Symbol
then
16910 Save_References_In_Char_Lit_Or_Op_Symbol
(N
);
16912 -- Defining identifiers
16914 elsif Nkind
(N
) in N_Entity
then
16919 elsif Nkind
(N
) = N_Identifier
then
16920 Save_References_In_Identifier
(N
);
16924 elsif Nkind
(N
) in N_Op
then
16925 Save_References_In_Operator
(N
);
16929 elsif Nkind
(N
) = N_Pragma
then
16930 Save_References_In_Pragma
(N
);
16932 elsif Nkind
(N
) = N_Aspect_Specification
then
16934 P
: constant Node_Id
:= Parent
(N
);
16938 if Permits_Aspect_Specifications
(P
) then
16940 -- The capture of global references within aspects
16941 -- associated with generic packages, subprograms or
16942 -- their bodies must be delayed due to timing of
16943 -- annotation analysis. Global references are still
16944 -- captured in routine Save_Global_References_In_Contract.
16946 if Requires_Delayed_Save
(Original_Node
(P
)) then
16949 -- Otherwise save all global references within the
16953 Expr
:= Expression
(N
);
16955 if Present
(Expr
) then
16956 Save_Global_References
(Expr
);
16962 -- Do not walk the node pointed to by Label_Construct twice
16964 elsif Nkind
(N
) = N_Implicit_Label_Declaration
then
16968 Save_References_In_Descendants
(N
);
16971 end Save_References
;
16973 ---------------------
16974 -- Set_Global_Type --
16975 ---------------------
16977 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
16978 Comparison
: constant Boolean := Nkind
(N2
) in N_Op_Compare
;
16979 Typ
: constant Entity_Id
:=
16980 (if Comparison
then Compare_Type
(N2
) else Etype
(N2
));
16983 -- For a comparison (or equality) operator, the Etype is Boolean, so
16984 -- it is always global. But the type subject to the Has_Private_View
16985 -- processing is the Compare_Type, so we must specifically check it.
16988 Set_Etype
(N
, Etype
(N2
));
16990 if not Is_Global
(Typ
) then
16994 Set_Compare_Type
(N
, Typ
);
16997 Set_Etype
(N
, Typ
);
17000 -- If the entity of N is not the associated node, this is a
17001 -- nested generic and it has an associated node as well, whose
17002 -- type is already the full view (see below). Indicate that the
17003 -- original node has a private view.
17005 if Entity
(N
) /= N2
then
17006 if Has_Private_View
(Entity
(N
)) then
17007 Set_Has_Private_View
(N
);
17010 if Has_Secondary_Private_View
(Entity
(N
)) then
17011 Set_Has_Secondary_Private_View
(N
);
17015 -- If not a private type, deal with a secondary private view
17017 if not Is_Private_Type
(Typ
) then
17018 if (Is_Access_Type
(Typ
)
17019 and then Is_Private_Type
(Designated_Type
(Typ
)))
17020 or else (Is_Array_Type
(Typ
)
17022 Is_Private_Type
(Component_Type_For_Private_View
(Typ
)))
17024 Set_Has_Secondary_Private_View
(N
);
17027 -- If it is a derivation of a private type in a context where no
17028 -- full view is needed, nothing to do either.
17030 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
17033 -- Otherwise mark the type for flipping and set the full view on N2
17034 -- when available, which is necessary for Check_Private_View to swap
17035 -- back the views in case the full declaration of Typ is visible in
17036 -- the instantiation context. Note that this will be problematic if
17037 -- N2 is re-analyzed later, e.g. if it's a default value in a call.
17040 Set_Has_Private_View
(N
);
17042 if Present
(Full_View
(Typ
)) then
17044 Set_Compare_Type
(N2
, Full_View
(Typ
));
17046 Set_Etype
(N2
, Full_View
(Typ
));
17051 if Is_Floating_Point_Type
(Typ
)
17052 and then Has_Dimension_System
(Typ
)
17054 Copy_Dimensions
(N2
, N
);
17056 end Set_Global_Type
;
17058 -- Start of processing for Save_Global_References
17061 Gen_Scope
:= Current_Scope
;
17063 -- If the generic unit is a child unit, references to entities in the
17064 -- parent are treated as local, because they will be resolved anew in
17065 -- the context of the instance of the parent.
17067 while Is_Child_Unit
(Gen_Scope
)
17068 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
17070 Gen_Scope
:= Scope
(Gen_Scope
);
17073 Save_References
(Templ
);
17074 end Save_Global_References
;
17076 ---------------------------------------
17077 -- Save_Global_References_In_Aspects --
17078 ---------------------------------------
17080 procedure Save_Global_References_In_Aspects
(N
: Node_Id
) is
17085 Asp
:= First
(Aspect_Specifications
(N
));
17086 while Present
(Asp
) loop
17087 Expr
:= Expression
(Asp
);
17089 if Present
(Expr
) then
17090 Save_Global_References
(Expr
);
17095 end Save_Global_References_In_Aspects
;
17097 ------------------------------------------
17098 -- Set_Copied_Sloc_For_Inherited_Pragma --
17099 ------------------------------------------
17101 procedure Set_Copied_Sloc_For_Inherited_Pragma
17106 Create_Instantiation_Source
(N
, E
,
17107 Inlined_Body
=> False,
17108 Inherited_Pragma
=> True,
17109 Factor
=> S_Adjustment
);
17110 end Set_Copied_Sloc_For_Inherited_Pragma
;
17112 --------------------------------------
17113 -- Set_Copied_Sloc_For_Inlined_Body --
17114 --------------------------------------
17116 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
17118 Create_Instantiation_Source
(N
, E
,
17119 Inlined_Body
=> True,
17120 Inherited_Pragma
=> False,
17121 Factor
=> S_Adjustment
);
17122 end Set_Copied_Sloc_For_Inlined_Body
;
17124 ---------------------
17125 -- Set_Instance_Of --
17126 ---------------------
17128 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
17130 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
17131 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
17132 Generic_Renamings
.Increment_Last
;
17133 end Set_Instance_Of
;
17135 --------------------
17136 -- Set_Next_Assoc --
17137 --------------------
17139 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
17141 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
17142 end Set_Next_Assoc
;
17144 -------------------
17145 -- Start_Generic --
17146 -------------------
17148 procedure Start_Generic
is
17150 -- ??? More things could be factored out in this routine.
17151 -- Should probably be done at a later stage.
17153 Generic_Flags
.Append
(Inside_A_Generic
);
17154 Inside_A_Generic
:= True;
17156 Expander_Mode_Save_And_Set
(False);
17159 ----------------------
17160 -- Set_Instance_Env --
17161 ----------------------
17163 -- WARNING: This routine manages SPARK regions
17165 procedure Set_Instance_Env
17166 (Gen_Unit
: Entity_Id
;
17167 Act_Unit
: Entity_Id
)
17169 Saved_AE
: constant Boolean := Assertions_Enabled
;
17170 Saved_CPL
: constant Node_Id
:= Check_Policy_List
;
17171 Saved_DEC
: constant Boolean := Dynamic_Elaboration_Checks
;
17172 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
17173 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
17176 -- Regardless of the current mode, predefined units are analyzed in the
17177 -- most current Ada mode, and earlier version Ada checks do not apply
17178 -- to predefined units. Nothing needs to be done for non-internal units.
17179 -- These are always analyzed in the current mode.
17181 if In_Internal_Unit
(Gen_Unit
) then
17183 -- The following call resets all configuration attributes to default
17184 -- or the xxx_Config versions of the attributes when the current sem
17185 -- unit is the main unit. At the same time, internal units must also
17186 -- inherit certain configuration attributes from their context. It
17187 -- is unclear what these two sets are.
17189 Set_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
17191 -- Reinstall relevant configuration attributes of the context
17193 Assertions_Enabled
:= Saved_AE
;
17194 Check_Policy_List
:= Saved_CPL
;
17195 Dynamic_Elaboration_Checks
:= Saved_DEC
;
17197 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
17200 Current_Instantiated_Parent
:=
17201 (Gen_Id
=> Gen_Unit
,
17202 Act_Id
=> Act_Unit
,
17203 Next_In_HTable
=> Assoc_Null
);
17204 end Set_Instance_Env
;
17210 procedure Switch_View
(T
: Entity_Id
) is
17211 BT
: constant Entity_Id
:= Base_Type
(T
);
17212 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
17213 Priv_Sub
: Entity_Id
;
17216 -- T may be private but its base type may have been exchanged through
17217 -- some other occurrence, in which case there is nothing to switch
17218 -- besides T itself. Note that a private dependent subtype of a private
17219 -- type might not have been switched even if the base type has been,
17220 -- because of the last branch of Check_Private_View (see comment there).
17222 if not Is_Private_Type
(BT
) then
17223 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
17224 Exchange_Declarations
(T
);
17228 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
17230 if Present
(Full_View
(BT
)) then
17231 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
17232 Exchange_Declarations
(BT
);
17235 while Present
(Priv_Elmt
) loop
17236 Priv_Sub
:= Node
(Priv_Elmt
);
17238 if Present
(Full_View
(Priv_Sub
)) then
17239 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
17240 Exchange_Declarations
(Priv_Sub
);
17243 Next_Elmt
(Priv_Elmt
);
17251 function True_Parent
(N
: Node_Id
) return Node_Id
is
17253 if Nkind
(Parent
(N
)) = N_Subunit
then
17254 return Parent
(Corresponding_Stub
(Parent
(N
)));
17260 -----------------------------
17261 -- Valid_Default_Attribute --
17262 -----------------------------
17264 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
17265 Attr_Id
: constant Attribute_Id
:=
17266 Get_Attribute_Id
(Attribute_Name
(Def
));
17267 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
17268 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
17274 if No
(T
) or else T
= Any_Id
then
17279 F
:= First_Formal
(Nam
);
17280 while Present
(F
) loop
17281 Num_F
:= Num_F
+ 1;
17286 when Attribute_Adjacent
17287 | Attribute_Ceiling
17288 | Attribute_Copy_Sign
17290 | Attribute_Fraction
17291 | Attribute_Machine
17293 | Attribute_Remainder
17294 | Attribute_Rounding
17295 | Attribute_Unbiased_Rounding
17299 and then Is_Floating_Point_Type
(T
);
17301 when Attribute_Image
17305 | Attribute_Wide_Image
17306 | Attribute_Wide_Value
17308 OK
:= Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
);
17313 OK
:= Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
);
17315 when Attribute_Input
=>
17316 OK
:= (Is_Fun
and then Num_F
= 1);
17318 when Attribute_Output
17319 | Attribute_Put_Image
17323 OK
:= not Is_Fun
and then Num_F
= 2;
17331 ("attribute reference has wrong profile for subprogram", Def
);
17333 end Valid_Default_Attribute
;
17335 ----------------------------------
17336 -- Validate_Formal_Type_Default --
17337 ----------------------------------
17339 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
) is
17340 Default
: constant Node_Id
:=
17341 Default_Subtype_Mark
(Original_Node
(Decl
));
17342 Formal
: constant Entity_Id
:= Defining_Identifier
(Decl
);
17344 Def_Sub
: Entity_Id
; -- Default subtype mark
17345 Type_Def
: Node_Id
;
17347 procedure Check_Discriminated_Formal
;
17348 -- Check that discriminants of default for private or incomplete
17349 -- type match those of formal type.
17351 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
;
17352 -- Check whether formal type definition mentions a previous formal
17353 -- type of the same generic.
17355 ----------------------
17356 -- Reference_Formal --
17357 ----------------------
17359 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
is
17361 if Is_Entity_Name
(N
)
17362 and then Scope
(Entity
(N
)) = Current_Scope
17368 end Reference_Formal
;
17370 function Depends_On_Other_Formals
is
17371 new Traverse_Func
(Reference_Formal
);
17373 function Default_Subtype_Matches
17374 (Gen_T
, Def_T
: Entity_Id
) return Boolean;
17376 procedure Validate_Array_Type_Default
;
17377 -- Verify that dimension, indices, and component types of default
17378 -- are compatible with formal array type definition.
17380 procedure Validate_Derived_Type_Default
;
17381 -- Verify that ancestor and progenitor types match.
17383 ---------------------------------
17384 -- Check_Discriminated_Formal --
17385 ---------------------------------
17387 procedure Check_Discriminated_Formal
is
17388 Formal_Discr
: Entity_Id
;
17389 Actual_Discr
: Entity_Id
;
17390 Formal_Subt
: Entity_Id
;
17393 if Has_Discriminants
(Formal
) then
17394 if not Has_Discriminants
(Def_Sub
) then
17396 ("default for & must have discriminants", Default
, Formal
);
17398 elsif Is_Constrained
(Def_Sub
) then
17400 ("default for & must be unconstrained", Default
, Formal
);
17403 Formal_Discr
:= First_Discriminant
(Formal
);
17404 Actual_Discr
:= First_Discriminant
(Def_Sub
);
17405 while Formal_Discr
/= Empty
loop
17406 if Actual_Discr
= Empty
then
17408 ("discriminants on Formal do not match formal",
17412 Formal_Subt
:= Etype
(Formal_Discr
);
17414 -- Access discriminants match if designated types do
17416 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
17417 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
17418 E_Anonymous_Access_Type
17421 (Designated_Type
(Base_Type
(Formal_Subt
))) =
17423 (Designated_Type
(Base_Type
(Etype
(Actual_Discr
))))
17425 Subtypes_Statically_Match
17426 (Designated_Type
(Base_Type
(Formal_Subt
)),
17427 Designated_Type
(Base_Type
(Etype
(Actual_Discr
))))
17431 elsif Base_Type
(Formal_Subt
) /=
17432 Base_Type
(Etype
(Actual_Discr
))
17435 ("types of discriminants of default must match formal",
17438 elsif not Subtypes_Statically_Match
17439 (Formal_Subt
, Etype
(Actual_Discr
))
17440 and then Ada_Version
>= Ada_95
17443 ("subtypes of discriminants of default "
17444 & "must match formal",
17448 Next_Discriminant
(Formal_Discr
);
17449 Next_Discriminant
(Actual_Discr
);
17452 if Actual_Discr
/= Empty
then
17454 ("discriminants on default do not match formal",
17459 end Check_Discriminated_Formal
;
17461 ---------------------------
17462 -- Default_Subtype_Matches --
17463 ---------------------------
17465 function Default_Subtype_Matches
17466 (Gen_T
, Def_T
: Entity_Id
) return Boolean
17469 -- Check that the base types, root types (when dealing with class
17470 -- wide types), or designated types (when dealing with anonymous
17471 -- access types) of Gen_T and Def_T are statically matching subtypes.
17473 return (Base_Type
(Gen_T
) = Base_Type
(Def_T
)
17474 and then Subtypes_Statically_Match
(Gen_T
, Def_T
))
17476 or else (Is_Class_Wide_Type
(Gen_T
)
17477 and then Is_Class_Wide_Type
(Def_T
)
17478 and then Default_Subtype_Matches
17479 (Root_Type
(Gen_T
), Root_Type
(Def_T
)))
17481 or else (Is_Anonymous_Access_Type
(Gen_T
)
17482 and then Ekind
(Def_T
) = Ekind
(Gen_T
)
17483 and then Subtypes_Statically_Match
17484 (Designated_Type
(Gen_T
), Designated_Type
(Def_T
)));
17486 end Default_Subtype_Matches
;
17488 ----------------------------------
17489 -- Validate_Array_Type_Default --
17490 ----------------------------------
17492 procedure Validate_Array_Type_Default
is
17496 if not Is_Array_Type
(Def_Sub
) then
17497 Error_Msg_NE
("default for& must be an array type ",
17501 elsif Number_Dimensions
(Def_Sub
) /= Number_Dimensions
(Formal
)
17502 or else Is_Constrained
(Def_Sub
) /=
17503 Is_Constrained
(Formal
)
17505 Error_Msg_NE
("default array type does not match&",
17510 I1
:= First_Index
(Formal
);
17511 I2
:= First_Index
(Def_Sub
);
17512 for J
in 1 .. Number_Dimensions
(Formal
) loop
17514 -- If the indexes of the actual were given by a subtype_mark,
17515 -- the index was transformed into a range attribute. Retrieve
17516 -- the original type mark for checking.
17518 if Is_Entity_Name
(Original_Node
(I2
)) then
17519 T2
:= Entity
(Original_Node
(I2
));
17524 if not Subtypes_Statically_Match
(Etype
(I1
), T2
) then
17526 ("index types of default do not match those of formal &",
17534 if not Default_Subtype_Matches
17535 (Component_Type
(Formal
), Component_Type
(Def_Sub
))
17538 ("component subtype of default does not match that of formal &",
17542 if Has_Aliased_Components
(Formal
)
17543 and then not Has_Aliased_Components
(Default
)
17546 ("default must have aliased components to match formal type &",
17549 end Validate_Array_Type_Default
;
17551 -----------------------------------
17552 -- Validate_Derived_Type_Default --
17553 -----------------------------------
17555 procedure Validate_Derived_Type_Default
is
17557 if not Is_Ancestor
(Etype
(Formal
), Def_Sub
) then
17558 Error_Msg_NE
("default must be a descendent of&",
17559 Default
, Etype
(Formal
));
17562 if Has_Interfaces
(Formal
) then
17563 if not Has_Interfaces
(Def_Sub
) then
17565 ("default must implement all interfaces of formal&",
17571 Iface_Ent
: Entity_Id
;
17574 Iface
:= First
(Abstract_Interface_List
(Formal
));
17576 while Present
(Iface
) loop
17577 Iface_Ent
:= Entity
(Iface
);
17579 if Is_Ancestor
(Iface_Ent
, Def_Sub
)
17580 or else Is_Progenitor
(Iface_Ent
, Def_Sub
)
17586 ("Default must implement interface&",
17587 Default
, Etype
(Iface
));
17595 end Validate_Derived_Type_Default
;
17597 -- Start of processing for Validate_Formal_Type_Default
17601 if not Is_Entity_Name
(Default
)
17602 or else not Is_Type
(Entity
(Default
))
17605 ("Expect type name for default of formal type", Default
);
17608 Def_Sub
:= Entity
(Default
);
17611 -- Formal derived_type declarations are transformed into full
17612 -- type declarations or Private_Type_Extensions for ease of processing.
17614 if Nkind
(Decl
) = N_Full_Type_Declaration
then
17615 Type_Def
:= Type_Definition
(Decl
);
17617 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
17618 Type_Def
:= Subtype_Indication
(Decl
);
17621 Type_Def
:= Formal_Type_Definition
(Decl
);
17624 if Depends_On_Other_Formals
(Type_Def
) = Abandon
17625 and then Scope
(Def_Sub
) /= Current_Scope
17627 Error_Msg_N
("default of formal type that depends on "
17628 & "other formals must be a previous formal type", Default
);
17631 elsif Def_Sub
= Formal
then
17633 ("default for formal type cannot be formal itsef", Default
);
17637 case Nkind
(Type_Def
) is
17639 when N_Formal_Private_Type_Definition
=>
17640 if (Is_Abstract_Type
(Formal
)
17641 and then not Is_Abstract_Type
(Def_Sub
))
17642 or else (Is_Limited_Type
(Formal
)
17643 and then not Is_Limited_Type
(Def_Sub
))
17646 ("default for private type$ does not match",
17650 Check_Discriminated_Formal
;
17652 when N_Formal_Derived_Type_Definition
=>
17653 Check_Discriminated_Formal
;
17654 Validate_Derived_Type_Default
;
17656 when N_Formal_Incomplete_Type_Definition
=>
17657 if Is_Tagged_Type
(Formal
)
17658 and then not Is_Tagged_Type
(Def_Sub
)
17661 ("default for & must be a tagged type", Default
, Formal
);
17664 Check_Discriminated_Formal
;
17666 when N_Formal_Discrete_Type_Definition
=>
17667 if not Is_Discrete_Type
(Def_Sub
) then
17668 Error_Msg_NE
("default for& must be a discrete type",
17672 when N_Formal_Signed_Integer_Type_Definition
=>
17673 if not Is_Integer_Type
(Def_Sub
) then
17674 Error_Msg_NE
("default for& must be a discrete type",
17678 when N_Formal_Modular_Type_Definition
=>
17679 if not Is_Modular_Integer_Type
(Def_Sub
) then
17680 Error_Msg_NE
("default for& must be a modular_integer Type",
17684 when N_Formal_Floating_Point_Definition
=>
17685 if not Is_Floating_Point_Type
(Def_Sub
) then
17686 Error_Msg_NE
("default for& must be a floating_point type",
17690 when N_Formal_Ordinary_Fixed_Point_Definition
=>
17691 if not Is_Ordinary_Fixed_Point_Type
(Def_Sub
) then
17692 Error_Msg_NE
("default for& must be "
17693 & "an ordinary_fixed_point type ",
17697 when N_Formal_Decimal_Fixed_Point_Definition
=>
17698 if not Is_Decimal_Fixed_Point_Type
(Def_Sub
) then
17699 Error_Msg_NE
("default for& must be "
17700 & "an Decimal_fixed_point type ",
17704 when N_Array_Type_Definition
=>
17705 Validate_Array_Type_Default
;
17707 when N_Access_Function_Definition |
17708 N_Access_Procedure_Definition
=>
17709 if Ekind
(Def_Sub
) /= E_Access_Subprogram_Type
then
17710 Error_Msg_NE
("default for& must be an Access_To_Subprogram",
17713 Check_Subtype_Conformant
17714 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
));
17716 when N_Access_To_Object_Definition
=>
17717 if not Is_Access_Object_Type
(Def_Sub
) then
17718 Error_Msg_NE
("default for& must be an Access_To_Object",
17721 elsif not Default_Subtype_Matches
17722 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
))
17724 Error_Msg_NE
("designated type of defaul does not match "
17725 & "designated type of formal type",
17729 when N_Record_Definition
=> -- Formal interface type
17730 if not Is_Interface
(Def_Sub
) then
17732 ("default for formal interface type must be an interface",
17735 elsif Is_Limited_Type
(Def_Sub
) /= Is_Limited_Type
(Formal
)
17736 or else Is_Task_Interface
(Formal
) /= Is_Task_Interface
(Def_Sub
)
17737 or else Is_Protected_Interface
(Formal
) /=
17738 Is_Protected_Interface
(Def_Sub
)
17739 or else Is_Synchronized_Interface
(Formal
) /=
17740 Is_Synchronized_Interface
(Def_Sub
)
17743 ("default for interface& does not match", Def_Sub
, Formal
);
17746 when N_Derived_Type_Definition
=>
17747 Validate_Derived_Type_Default
;
17749 when N_Identifier
=> -- case of a private extension
17750 Validate_Derived_Type_Default
;
17756 raise Program_Error
;
17758 end Validate_Formal_Type_Default
;