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 Contains_Instance_Of
588 N
: Node_Id
) return Boolean;
589 -- Inner is instantiated within the generic Outer. Check whether Inner
590 -- directly or indirectly contains an instance of Outer or of one of its
591 -- parents, in the case of a subunit. Each generic unit holds a list of
592 -- the entities instantiated within (at any depth). This procedure
593 -- determines whether the set of such lists contains a cycle, i.e. an
594 -- illegal circular instantiation.
596 function Denotes_Formal_Package
598 On_Exit
: Boolean := False;
599 Instance
: Entity_Id
:= Empty
) return Boolean;
600 -- Returns True if E is a formal package of an enclosing generic, or
601 -- the actual for such a formal in an enclosing instantiation. If such
602 -- a package is used as a formal in an nested generic, or as an actual
603 -- in a nested instantiation, the visibility of ITS formals should not
604 -- be modified. When called from within Restore_Private_Views, the flag
605 -- On_Exit is true, to indicate that the search for a possible enclosing
606 -- instance should ignore the current one. In that case Instance denotes
607 -- the declaration for which this is an actual. This declaration may be
608 -- an instantiation in the source, or the internal instantiation that
609 -- corresponds to the actual for a formal package.
611 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
612 -- Yields True if N1 and N2 appear in the same compilation unit,
613 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
614 -- traversal of the tree for the unit. Used to determine the placement
615 -- of freeze nodes for instance bodies that may depend on other instances.
617 function Find_Actual_Type
619 Gen_Type
: Entity_Id
) return Entity_Id
;
620 -- When validating the actual types of a child instance, check whether
621 -- the formal is a formal type of the parent unit, and retrieve the current
622 -- actual for it. Typ is the entity in the analyzed formal type declaration
623 -- (component or index type of an array type, or designated type of an
624 -- access formal) and Gen_Type is the enclosing analyzed formal array
625 -- or access type. The desired actual may be a formal of a parent, or may
626 -- be declared in a formal package of a parent. In both cases it is a
627 -- generic actual type because it appears within a visible instance.
628 -- Finally, it may be declared in a parent unit without being a formal
629 -- of that unit, in which case it must be retrieved by visibility.
630 -- Ambiguities may still arise if two homonyms are declared in two formal
631 -- packages, and the prefix of the formal type may be needed to resolve
632 -- the ambiguity in the instance ???
634 procedure Freeze_Package_Instance
639 -- If the instantiation happens textually before the body of the generic,
640 -- the instantiation of the body must be analyzed after the generic body,
641 -- and not at the point of instantiation. Such early instantiations can
642 -- happen if the generic and the instance appear in a package declaration
643 -- because the generic body can only appear in the corresponding package
644 -- body. Early instantiations can also appear if generic, instance and
645 -- body are all in the declarative part of a subprogram or entry. Entities
646 -- of packages that are early instantiations are delayed, and their freeze
647 -- node appears after the generic body. This rather complex machinery is
648 -- needed when nested instantiations are present, because the source does
649 -- not carry any indication of where the corresponding instance bodies must
650 -- be installed and frozen.
652 procedure Freeze_Subprogram_Instance
655 Pack_Id
: Entity_Id
);
656 -- The generic body may appear textually after the instance, including
657 -- in the proper body of a stub, or within a different package instance.
658 -- Given that the instance can only be elaborated after the generic, we
659 -- place freeze nodes for the instance and/or for packages that may enclose
660 -- the instance and the generic, so that the back-end can establish the
661 -- proper order of elaboration.
663 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
664 -- In order to propagate semantic information back from the analyzed copy
665 -- to the original generic, we maintain links between selected nodes in the
666 -- generic and their corresponding copies. At the end of generic analysis,
667 -- the routine Save_Global_References traverses the generic tree, examines
668 -- the semantic information, and preserves the links to those nodes that
669 -- contain global information. At instantiation, the information from the
670 -- associated node is placed on the new copy, so that name resolution is
673 -- Three kinds of source nodes have associated nodes:
675 -- a) those that can reference (denote) entities, that is identifiers,
676 -- character literals, expanded_names, operator symbols, operators,
677 -- and attribute reference nodes. These nodes have an Entity field
678 -- and are the set of nodes that are in N_Has_Entity.
680 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
682 -- c) selected components (N_Selected_Component)
684 -- For the first class, the associated node preserves the entity if it is
685 -- global. If the generic contains nested instantiations, the associated
686 -- node itself has been recopied, and a chain of them must be followed.
688 -- For aggregates, the associated node allows retrieval of the type, which
689 -- may otherwise not appear in the generic. The view of this type may be
690 -- different between generic and instantiation, and the full view can be
691 -- installed before the instantiation is analyzed. For aggregates of type
692 -- extensions, the same view exchange may have to be performed for some of
693 -- the ancestor types, if their view is private at the point of
696 -- Nodes that are selected components in the parse tree may be rewritten
697 -- as expanded names after resolution, and must be treated as potential
698 -- entity holders, which is why they also have an Associated_Node.
700 -- Nodes that do not come from source, such as freeze nodes, do not appear
701 -- in the generic tree, and need not have an associated node.
703 -- The associated node is stored in the Associated_Node field. Note that
704 -- this field overlaps Entity, which is fine, because the whole point is
705 -- that we don't need or want the normal Entity field in this situation.
707 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
708 -- Traverse the Exchanged_Views list to see if a type was private
709 -- and has already been flipped during this phase of instantiation.
711 function Has_Contracts
(Decl
: Node_Id
) return Boolean;
712 -- Determine whether a formal subprogram has a Pre- or Postcondition,
713 -- in which case a subprogram wrapper has to be built for the actual.
715 procedure Hide_Current_Scope
;
716 -- When instantiating a generic child unit, the parent context must be
717 -- present, but the instance and all entities that may be generated
718 -- must be inserted in the current scope. We leave the current scope
719 -- on the stack, but make its entities invisible to avoid visibility
720 -- problems. This is reversed at the end of the instantiation. This is
721 -- not done for the instantiation of the bodies, which only require the
722 -- instances of the generic parents to be in scope.
724 function In_Main_Context
(E
: Entity_Id
) return Boolean;
725 -- Check whether an instantiation is in the context of the main unit.
726 -- Used to determine whether its body should be elaborated to allow
727 -- front-end inlining.
729 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
730 -- Add the context clause of the unit containing a generic unit to a
731 -- compilation unit that is, or contains, an instantiation.
734 -- Establish environment for subsequent instantiation. Separated from
735 -- Save_Env because data-structures for visibility handling must be
736 -- initialized before call to Check_Generic_Child_Unit.
738 procedure Inline_Instance_Body
740 Gen_Unit
: Entity_Id
;
742 -- If front-end inlining is requested, instantiate the package body,
743 -- and preserve the visibility of its compilation unit, to insure
744 -- that successive instantiations succeed.
746 procedure Insert_Freeze_Node_For_Instance
749 -- N denotes a package or a subprogram instantiation and F_Node is the
750 -- associated freeze node. Insert the freeze node before the first source
751 -- body which follows immediately after N. If no such body is found, the
752 -- freeze node is inserted at the end of the declarative region which
753 -- contains N, unless the instantiation is done in a package spec that is
754 -- not at library level, in which case it is inserted at the outer level.
755 -- This can also be invoked to insert the freeze node of a package that
756 -- encloses an instantiation, in which case N may denote an arbitrary node.
758 procedure Install_Formal_Packages
(Par
: Entity_Id
);
759 -- Install the visible part of any formal of the parent that is a formal
760 -- package. Note that for the case of a formal package with a box, this
761 -- includes the formal part of the formal package (12.7(10/2)).
763 procedure Install_Hidden_Primitives
764 (Prims_List
: in out Elist_Id
;
767 -- Remove suffix 'P' from hidden primitives of Act_T to match the
768 -- visibility of primitives of Gen_T. The list of primitives to which
769 -- the suffix is removed is added to Prims_List to restore them later.
771 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
772 -- When compiling an instance of a child unit the parent (which is
773 -- itself an instance) is an enclosing scope that must be made
774 -- immediately visible. This procedure is also used to install the non-
775 -- generic parent of a generic child unit when compiling its body, so
776 -- that full views of types in the parent are made visible.
778 -- The functions Instantiate_XXX perform various legality checks and build
779 -- the declarations for instantiated generic parameters. In all of these
780 -- Formal is the entity in the generic unit, Actual is the entity of
781 -- expression in the generic associations, and Analyzed_Formal is the
782 -- formal in the generic copy, which contains the semantic information to
783 -- be used to validate the actual.
785 function Instantiate_Object
788 Analyzed_Formal
: Node_Id
) return List_Id
;
790 function Instantiate_Type
793 Analyzed_Formal
: Node_Id
;
794 Actual_Decls
: List_Id
) return List_Id
;
796 function Instantiate_Formal_Subprogram
799 Analyzed_Formal
: Node_Id
) return Node_Id
;
801 function Instantiate_Formal_Package
804 Analyzed_Formal
: Node_Id
) return List_Id
;
805 -- If the formal package is declared with a box, special visibility rules
806 -- apply to its formals: they are in the visible part of the package. This
807 -- is true in the declarative region of the formal package, that is to say
808 -- in the enclosing generic or instantiation. For an instantiation, the
809 -- parameters of the formal package are made visible in an explicit step.
810 -- Furthermore, if the actual has a visible USE clause, these formals must
811 -- be made potentially use-visible as well. On exit from the enclosing
812 -- instantiation, the reverse must be done.
814 -- For a formal package declared without a box, there are conformance rules
815 -- that apply to the actuals in the generic declaration and the actuals of
816 -- the actual package in the enclosing instantiation. The simplest way to
817 -- apply these rules is to repeat the instantiation of the formal package
818 -- in the context of the enclosing instance, and compare the generic
819 -- associations of this instantiation with those of the actual package.
820 -- This internal instantiation only needs to contain the renamings of the
821 -- formals: the visible and private declarations themselves need not be
824 -- In Ada 2005, the formal package may be only partially parameterized.
825 -- In that case the visibility step must make visible those actuals whose
826 -- corresponding formals were given with a box. A final complication
827 -- involves inherited operations from formal derived types, which must
828 -- be visible if the type is.
830 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
831 -- Test if given node is in the main unit
833 procedure Load_Parent_Of_Generic
836 Body_Optional
: Boolean := False);
837 -- If the generic appears in a separate non-generic library unit, load the
838 -- corresponding body to retrieve the body of the generic. N is the node
839 -- for the generic instantiation, Spec is the generic package declaration.
841 -- Body_Optional is a flag that indicates that the body is being loaded to
842 -- ensure that temporaries are generated consistently when there are other
843 -- instances in the current declarative part that precede the one being
844 -- loaded. In that case a missing body is acceptable.
846 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
847 -- Within the generic part, entities in the formal package are
848 -- visible. To validate subsequent type declarations, indicate
849 -- the correspondence between the entities in the analyzed formal,
850 -- and the entities in the actual package. There are three packages
851 -- involved in the instantiation of a formal package: the parent
852 -- generic P1 which appears in the generic declaration, the fake
853 -- instantiation P2 which appears in the analyzed generic, and whose
854 -- visible entities may be used in subsequent formals, and the actual
855 -- P3 in the instance. To validate subsequent formals, me indicate
856 -- that the entities in P2 are mapped into those of P3. The mapping of
857 -- entities has to be done recursively for nested packages.
859 procedure Move_Freeze_Nodes
863 -- Freeze nodes can be generated in the analysis of a generic unit, but
864 -- will not be seen by the back-end. It is necessary to move those nodes
865 -- to the enclosing scope if they freeze an outer entity. We place them
866 -- at the end of the enclosing generic package, which is semantically
869 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
);
870 -- Analyze actuals to perform name resolution. Full resolution is done
871 -- later, when the expected types are known, but names have to be captured
872 -- before installing parents of generics, that are not visible for the
873 -- actuals themselves.
875 -- If Inst is present, it is the entity of the package instance. This
876 -- entity is marked as having a limited_view actual when some actual is
877 -- a limited view. This is used to place the instance body properly.
879 procedure Provide_Completing_Bodies
(N
: Node_Id
);
880 -- Generate completing bodies for all subprograms found within package or
881 -- subprogram declaration N.
883 procedure Remove_Parent
(In_Body
: Boolean := False);
884 -- Reverse effect after instantiation of child is complete
886 function Requires_Conformance_Checking
(N
: Node_Id
) return Boolean;
887 -- Determine whether the formal package declaration N requires conformance
888 -- checking with actuals in instantiations.
890 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
891 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
894 procedure Set_Instance_Env
895 (Gen_Unit
: Entity_Id
;
896 Act_Unit
: Entity_Id
);
897 -- Save current instance on saved environment, to be used to determine
898 -- the global status of entities in nested instances. Part of Save_Env.
899 -- called after verifying that the generic unit is legal for the instance,
900 -- The procedure also examines whether the generic unit is a predefined
901 -- unit, in order to set configuration switches accordingly. As a result
902 -- the procedure must be called after analyzing and freezing the actuals.
904 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
905 -- Associate analyzed generic parameter with corresponding instance. Used
906 -- for semantic checks at instantiation time.
908 function True_Parent
(N
: Node_Id
) return Node_Id
;
909 -- For a subunit, return parent of corresponding stub, else return
912 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
913 -- Verify that an attribute that appears as the default for a formal
914 -- subprogram is a function or procedure with the correct profile.
916 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
);
917 -- Ada_2022 AI12-205: if a default subtype_mark is present, verify
918 -- that it is the name of a type in the same class as the formal.
919 -- The treatment parallels what is done in Instantiate_Type but differs
920 -- in a few ways so that this machinery cannot be reused as is: on one
921 -- hand there are no visibility issues for a default, because it is
922 -- analyzed in the same context as the formal type definition; on the
923 -- other hand the check needs to take into acount the use of a previous
924 -- formal type in the current formal type definition (see details in
927 -------------------------------------------
928 -- Data Structures for Generic Renamings --
929 -------------------------------------------
931 -- The map Generic_Renamings associates generic entities with their
932 -- corresponding actuals. Currently used to validate type instances. It
933 -- will eventually be used for all generic parameters to eliminate the
934 -- need for overload resolution in the instance.
936 type Assoc_Ptr
is new Int
;
938 Assoc_Null
: constant Assoc_Ptr
:= -1;
943 Next_In_HTable
: Assoc_Ptr
;
946 package Generic_Renamings
is new Table
.Table
947 (Table_Component_Type
=> Assoc
,
948 Table_Index_Type
=> Assoc_Ptr
,
949 Table_Low_Bound
=> 0,
951 Table_Increment
=> 100,
952 Table_Name
=> "Generic_Renamings");
954 -- Variable to hold enclosing instantiation. When the environment is
955 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
957 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
959 -- Hash table for associations
961 HTable_Size
: constant := 37;
962 type HTable_Range
is range 0 .. HTable_Size
- 1;
964 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
965 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
966 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
967 function Hash
(F
: Entity_Id
) return HTable_Range
;
969 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
970 Header_Num
=> HTable_Range
,
972 Elmt_Ptr
=> Assoc_Ptr
,
973 Null_Ptr
=> Assoc_Null
,
974 Set_Next
=> Set_Next_Assoc
,
977 Get_Key
=> Get_Gen_Id
,
981 Exchanged_Views
: Elist_Id
;
982 -- This list holds the private views that have been exchanged during
983 -- instantiation to restore the visibility of the generic declaration.
984 -- (see comments above). After instantiation, the current visibility is
985 -- reestablished by means of a traversal of this list.
987 Hidden_Entities
: Elist_Id
;
988 -- This list holds the entities of the current scope that are removed
989 -- from immediate visibility when instantiating a child unit. Their
990 -- visibility is restored in Remove_Parent.
992 -- Because instantiations can be recursive, the following must be saved
993 -- on entry and restored on exit from an instantiation (spec or body).
994 -- This is done by the two procedures Save_Env and Restore_Env. For
995 -- package and subprogram instantiations (but not for the body instances)
996 -- the action of Save_Env is done in two steps: Init_Env is called before
997 -- Check_Generic_Child_Unit, because setting the parent instances requires
998 -- that the visibility data structures be properly initialized. Once the
999 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
1001 Parent_Unit_Visible
: Boolean := False;
1002 -- Parent_Unit_Visible is used when the generic is a child unit, and
1003 -- indicates whether the ultimate parent of the generic is visible in the
1004 -- instantiation environment. It is used to reset the visibility of the
1005 -- parent at the end of the instantiation (see Remove_Parent).
1007 Instance_Parent_Unit
: Entity_Id
:= Empty
;
1008 -- This records the ultimate parent unit of an instance of a generic
1009 -- child unit and is used in conjunction with Parent_Unit_Visible to
1010 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
1012 type Instance_Env
is record
1013 Instantiated_Parent
: Assoc
;
1014 Exchanged_Views
: Elist_Id
;
1015 Hidden_Entities
: Elist_Id
;
1016 Current_Sem_Unit
: Unit_Number_Type
;
1017 Parent_Unit_Visible
: Boolean := False;
1018 Instance_Parent_Unit
: Entity_Id
:= Empty
;
1019 Switches
: Config_Switches_Type
;
1022 package Instance_Envs
is new Table
.Table
(
1023 Table_Component_Type
=> Instance_Env
,
1024 Table_Index_Type
=> Int
,
1025 Table_Low_Bound
=> 0,
1026 Table_Initial
=> 32,
1027 Table_Increment
=> 100,
1028 Table_Name
=> "Instance_Envs");
1030 procedure Restore_Private_Views
1031 (Pack_Id
: Entity_Id
;
1032 Is_Package
: Boolean := True);
1033 -- Restore the private views of external types, and unmark the generic
1034 -- renamings of actuals, so that they become compatible subtypes again.
1035 -- For subprograms, Pack_Id is the package constructed to hold the
1038 procedure Switch_View
(T
: Entity_Id
);
1039 -- Switch the partial and full views of a type and its private
1040 -- dependents (i.e. its subtypes and derived types).
1042 ------------------------------------
1043 -- Structures for Error Reporting --
1044 ------------------------------------
1046 Instantiation_Node
: Node_Id
;
1047 -- Used by subprograms that validate instantiation of formal parameters
1048 -- where there might be no actual on which to place the error message.
1049 -- Also used to locate the instantiation node for generic subunits.
1051 Instantiation_Error
: exception;
1052 -- When there is a semantic error in the generic parameter matching,
1053 -- there is no point in continuing the instantiation, because the
1054 -- number of cascaded errors is unpredictable. This exception aborts
1055 -- the instantiation process altogether.
1057 S_Adjustment
: Sloc_Adjustment
;
1058 -- Offset created for each node in an instantiation, in order to keep
1059 -- track of the source position of the instantiation in each of its nodes.
1060 -- A subsequent semantic error or warning on a construct of the instance
1061 -- points to both places: the original generic node, and the point of
1062 -- instantiation. See Sinput and Sinput.L for additional details.
1064 ------------------------------------------------------------
1065 -- Data structure for keeping track when inside a Generic --
1066 ------------------------------------------------------------
1068 -- The following table is used to save values of the Inside_A_Generic
1069 -- flag (see spec of Sem) when they are saved by Start_Generic.
1071 package Generic_Flags
is new Table
.Table
(
1072 Table_Component_Type
=> Boolean,
1073 Table_Index_Type
=> Int
,
1074 Table_Low_Bound
=> 0,
1075 Table_Initial
=> 32,
1076 Table_Increment
=> 200,
1077 Table_Name
=> "Generic_Flags");
1079 ---------------------------
1080 -- Abandon_Instantiation --
1081 ---------------------------
1083 procedure Abandon_Instantiation
(N
: Node_Id
) is
1085 Error_Msg_N
("\instantiation abandoned!", N
);
1086 raise Instantiation_Error
;
1087 end Abandon_Instantiation
;
1089 ----------------------------------
1090 -- Adjust_Inherited_Pragma_Sloc --
1091 ----------------------------------
1093 procedure Adjust_Inherited_Pragma_Sloc
(N
: Node_Id
) is
1095 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1096 end Adjust_Inherited_Pragma_Sloc
;
1098 --------------------------
1099 -- Analyze_Associations --
1100 --------------------------
1102 function Analyze_Associations
1105 F_Copy
: List_Id
) return List_Id
1107 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
1108 Assoc_List
: constant List_Id
:= New_List
;
1109 Default_Actuals
: constant List_Id
:= New_List
;
1110 Gen_Unit
: constant Entity_Id
:=
1111 Defining_Entity
(Parent
(F_Copy
));
1115 Analyzed_Formal
: Node_Id
;
1116 First_Named
: Node_Id
:= Empty
;
1118 Match
: Node_Id
:= Empty
;
1120 Saved_Formal
: Node_Id
;
1122 Default_Formals
: constant List_Id
:= New_List
;
1123 -- If an Others_Choice is present, some of the formals may be defaulted.
1124 -- To simplify the treatment of visibility in an instance, we introduce
1125 -- individual defaults for each such formal. These defaults are
1126 -- appended to the list of associations and replace the Others_Choice.
1128 Found_Assoc
: Node_Id
;
1129 -- Association for the current formal being match. Empty if there are
1130 -- no remaining actuals, or if there is no named association with the
1131 -- name of the formal.
1133 Is_Named_Assoc
: Boolean;
1134 Num_Matched
: Nat
:= 0;
1135 Num_Actuals
: Nat
:= 0;
1137 Others_Present
: Boolean := False;
1138 Others_Choice
: Node_Id
:= Empty
;
1139 -- In Ada 2005, indicates partial parameterization of a formal
1140 -- package. As usual an other association must be last in the list.
1142 procedure Build_Subprogram_Wrappers
;
1143 -- Ada 2022: AI12-0272 introduces pre/postconditions for formal
1144 -- subprograms. The implementation of making the formal into a renaming
1145 -- of the actual does not work, given that subprogram renaming cannot
1146 -- carry aspect specifications. Instead we must create subprogram
1147 -- wrappers whose body is a call to the actual, and whose declaration
1148 -- carries the aspects of the formal.
1150 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
);
1151 -- Warn if an actual fixed-point type has user-defined arithmetic
1152 -- operations, but there is no corresponding formal in the generic,
1153 -- in which case the predefined operations will be used. This merits
1154 -- a warning because of the special semantics of fixed point ops.
1156 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Node_Id
);
1157 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1158 -- cannot have a named association for it. AI05-0025 extends this rule
1159 -- to formals of formal packages by AI05-0025, and it also applies to
1160 -- box-initialized formals.
1162 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
1163 -- Determine whether the parameter types and the return type of Subp
1164 -- are fully defined at the point of instantiation.
1166 function Matching_Actual
1168 A_F
: Entity_Id
) return Node_Id
;
1169 -- Find actual that corresponds to a given formal parameter. If the
1170 -- actuals are positional, return the next one, if any. If the actuals
1171 -- are named, scan the parameter associations to find the right one.
1172 -- A_F is the corresponding entity in the analyzed generic, which is
1173 -- placed on the selector name.
1175 -- In Ada 2005, a named association may be given with a box, in which
1176 -- case Matching_Actual sets Found_Assoc to the generic association,
1177 -- but return Empty for the actual itself. In this case the code below
1178 -- creates a corresponding declaration for the formal.
1180 function Partial_Parameterization
return Boolean;
1181 -- Ada 2005: if no match is found for a given formal, check if the
1182 -- association for it includes a box, or whether the associations
1183 -- include an Others clause.
1185 procedure Process_Default
(Formal
: Node_Id
);
1186 -- Add a copy of the declaration of a generic formal to the list of
1187 -- associations, and add an explicit box association for its entity
1188 -- if there is none yet, and the default comes from an Others_Choice.
1190 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1191 -- Determine whether Subp renames one of the subprograms defined in the
1192 -- generated package Standard.
1194 procedure Set_Analyzed_Formal
;
1195 -- Find the node in the generic copy that corresponds to a given formal.
1196 -- The semantic information on this node is used to perform legality
1197 -- checks on the actuals. Because semantic analysis can introduce some
1198 -- anonymous entities or modify the declaration node itself, the
1199 -- correspondence between the two lists is not one-one. In addition to
1200 -- anonymous types, the presence a formal equality will introduce an
1201 -- implicit declaration for the corresponding inequality.
1203 -------------------------------
1204 -- Build_Subprogram_Wrappers --
1205 -------------------------------
1207 procedure Build_Subprogram_Wrappers
is
1208 function Adjust_Aspect_Sloc
(N
: Node_Id
) return Traverse_Result
;
1209 -- Adjust sloc so that errors located at N will be reported with
1210 -- information about the instance and not just about the generic.
1212 ------------------------
1213 -- Adjust_Aspect_Sloc --
1214 ------------------------
1216 function Adjust_Aspect_Sloc
(N
: Node_Id
) return Traverse_Result
is
1218 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1220 end Adjust_Aspect_Sloc
;
1222 procedure Adjust_Aspect_Slocs
is new
1223 Traverse_Proc
(Adjust_Aspect_Sloc
);
1225 Formal
: constant Entity_Id
:=
1226 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
1227 Aspect_Spec
: Node_Id
;
1228 Decl_Node
: Node_Id
;
1229 Actual_Name
: Node_Id
;
1231 -- Start of processing for Build_Subprogram_Wrappers
1234 -- Create declaration for wrapper subprogram
1235 -- The actual can be overloaded, in which case it will be
1236 -- resolved when the call in the wrapper body is analyzed.
1237 -- We attach the possible interpretations of the actual to
1238 -- the name to be used in the call in the wrapper body.
1240 if Is_Entity_Name
(Match
) then
1241 Actual_Name
:= New_Occurrence_Of
(Entity
(Match
), Sloc
(Match
));
1243 if Is_Overloaded
(Match
) then
1244 Save_Interps
(Match
, Actual_Name
);
1248 -- Use renaming declaration created when analyzing actual.
1249 -- This may be incomplete if there are several formal
1250 -- subprograms whose actual is an attribute ???
1253 Renaming_Decl
: constant Node_Id
:= Last
(Assoc_List
);
1256 Actual_Name
:= New_Occurrence_Of
1257 (Defining_Entity
(Renaming_Decl
), Sloc
(Match
));
1258 Set_Etype
(Actual_Name
, Get_Instance_Of
(Etype
(Formal
)));
1262 Decl_Node
:= Build_Subprogram_Decl_Wrapper
(Formal
);
1264 -- Transfer aspect specifications from formal subprogram to wrapper
1266 Set_Aspect_Specifications
(Decl_Node
,
1267 New_Copy_List_Tree
(Aspect_Specifications
(Analyzed_Formal
)));
1269 Aspect_Spec
:= First
(Aspect_Specifications
(Decl_Node
));
1270 while Present
(Aspect_Spec
) loop
1271 Adjust_Aspect_Slocs
(Aspect_Spec
);
1272 Set_Analyzed
(Aspect_Spec
, False);
1276 Append_To
(Assoc_List
, Decl_Node
);
1278 -- Create corresponding body, and append it to association list
1279 -- that appears at the head of the declarations in the instance.
1280 -- The subprogram may be called in the analysis of subsequent
1283 Append_To
(Assoc_List
,
1284 Build_Subprogram_Body_Wrapper
(Formal
, Actual_Name
));
1285 end Build_Subprogram_Wrappers
;
1287 ----------------------------------------
1288 -- Check_Overloaded_Formal_Subprogram --
1289 ----------------------------------------
1291 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Node_Id
) is
1292 Temp_Formal
: Node_Id
;
1295 Temp_Formal
:= First
(Formals
);
1296 while Present
(Temp_Formal
) loop
1297 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1298 and then Temp_Formal
/= Formal
1300 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1301 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1303 if Present
(Found_Assoc
) then
1305 ("named association not allowed for overloaded formal",
1310 ("named association not allowed for overloaded formal",
1314 Abandon_Instantiation
(Instantiation_Node
);
1319 end Check_Overloaded_Formal_Subprogram
;
1321 -------------------------------
1322 -- Check_Fixed_Point_Actual --
1323 -------------------------------
1325 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
) is
1326 Typ
: constant Entity_Id
:= Entity
(Actual
);
1327 Prims
: constant Elist_Id
:= Collect_Primitive_Operations
(Typ
);
1333 -- Locate primitive operations of the type that are arithmetic
1336 Elem
:= First_Elmt
(Prims
);
1337 while Present
(Elem
) loop
1338 if Nkind
(Node
(Elem
)) = N_Defining_Operator_Symbol
then
1340 -- Check whether the generic unit has a formal subprogram of
1341 -- the same name. This does not check types but is good enough
1342 -- to justify a warning.
1344 Formal
:= First_Non_Pragma
(Formals
);
1345 Op
:= Alias
(Node
(Elem
));
1347 while Present
(Formal
) loop
1348 if Nkind
(Formal
) = N_Formal_Concrete_Subprogram_Declaration
1349 and then Chars
(Defining_Entity
(Formal
)) =
1354 elsif Nkind
(Formal
) = N_Formal_Package_Declaration
then
1360 -- Locate corresponding actual, and check whether it
1361 -- includes a fixed-point type.
1363 Assoc
:= First
(Assoc_List
);
1364 while Present
(Assoc
) loop
1366 Nkind
(Assoc
) = N_Package_Renaming_Declaration
1367 and then Chars
(Defining_Unit_Name
(Assoc
)) =
1368 Chars
(Defining_Identifier
(Formal
));
1373 if Present
(Assoc
) then
1375 -- If formal package declares a fixed-point type,
1376 -- and the user-defined operator is derived from
1377 -- a generic instance package, the fixed-point type
1378 -- does not use the corresponding predefined op.
1380 Ent
:= First_Entity
(Entity
(Name
(Assoc
)));
1381 while Present
(Ent
) loop
1382 if Is_Fixed_Point_Type
(Ent
)
1383 and then Present
(Op
)
1384 and then Is_Generic_Instance
(Scope
(Op
))
1399 Error_Msg_Sloc
:= Sloc
(Node
(Elem
));
1401 ("?instance uses predefined operation, not primitive "
1402 & "operation&#", Actual
, Node
(Elem
));
1408 end Check_Fixed_Point_Actual
;
1410 -------------------------------
1411 -- Has_Fully_Defined_Profile --
1412 -------------------------------
1414 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1415 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1416 -- Determine whethet type Typ is fully defined
1418 ---------------------------
1419 -- Is_Fully_Defined_Type --
1420 ---------------------------
1422 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1424 -- A private type without a full view is not fully defined
1426 if Is_Private_Type
(Typ
)
1427 and then No
(Full_View
(Typ
))
1431 -- An incomplete type is never fully defined
1433 elsif Is_Incomplete_Type
(Typ
) then
1436 -- All other types are fully defined
1441 end Is_Fully_Defined_Type
;
1443 -- Local declarations
1447 -- Start of processing for Has_Fully_Defined_Profile
1450 -- Check the parameters
1452 Param
:= First_Formal
(Subp
);
1453 while Present
(Param
) loop
1454 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1458 Next_Formal
(Param
);
1461 -- Check the return type
1463 return Is_Fully_Defined_Type
(Etype
(Subp
));
1464 end Has_Fully_Defined_Profile
;
1466 ---------------------
1467 -- Matching_Actual --
1468 ---------------------
1470 function Matching_Actual
1472 A_F
: Entity_Id
) return Node_Id
1478 Is_Named_Assoc
:= False;
1480 -- End of list of purely positional parameters
1482 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1483 Found_Assoc
:= Empty
;
1486 -- Case of positional parameter corresponding to current formal
1488 elsif No
(Selector_Name
(Actual
)) then
1489 Found_Assoc
:= Actual
;
1490 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1491 Num_Matched
:= Num_Matched
+ 1;
1494 -- Otherwise scan list of named actuals to find the one with the
1495 -- desired name. All remaining actuals have explicit names.
1498 Is_Named_Assoc
:= True;
1499 Found_Assoc
:= Empty
;
1503 while Present
(Actual
) loop
1504 if Nkind
(Actual
) = N_Others_Choice
then
1505 Found_Assoc
:= Empty
;
1508 elsif Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1509 Set_Entity
(Selector_Name
(Actual
), A_F
);
1510 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1511 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1513 Found_Assoc
:= Actual
;
1514 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1515 Num_Matched
:= Num_Matched
+ 1;
1523 -- Reset for subsequent searches. In most cases the named
1524 -- associations are in order. If they are not, we reorder them
1525 -- to avoid scanning twice the same actual. This is not just a
1526 -- question of efficiency: there may be multiple defaults with
1527 -- boxes that have the same name. In a nested instantiation we
1528 -- insert actuals for those defaults, and cannot rely on their
1529 -- names to disambiguate them.
1531 if Actual
= First_Named
then
1534 elsif Present
(Actual
) then
1535 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1538 Actual
:= First_Named
;
1541 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1542 Set_Used_As_Generic_Actual
(Entity
(Act
));
1546 end Matching_Actual
;
1548 ------------------------------
1549 -- Partial_Parameterization --
1550 ------------------------------
1552 function Partial_Parameterization
return Boolean is
1554 return Others_Present
1555 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1556 end Partial_Parameterization
;
1558 ---------------------
1559 -- Process_Default --
1560 ---------------------
1562 procedure Process_Default
(Formal
: Node_Id
) is
1563 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1564 F_Id
: constant Entity_Id
:= Defining_Entity
(Formal
);
1570 -- Append copy of formal declaration to associations, and create new
1571 -- defining identifier for it.
1573 Decl
:= New_Copy_Tree
(Formal
);
1574 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1576 if Nkind
(Formal
) in N_Formal_Subprogram_Declaration
then
1577 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1580 Set_Defining_Identifier
(Decl
, Id
);
1583 Append
(Decl
, Assoc_List
);
1585 if No
(Found_Assoc
) then
1587 Make_Generic_Association
(Loc
,
1589 New_Occurrence_Of
(Id
, Loc
),
1590 Explicit_Generic_Actual_Parameter
=> Empty
);
1591 Set_Box_Present
(Default
);
1592 Append
(Default
, Default_Formals
);
1594 end Process_Default
;
1596 ---------------------------------
1597 -- Renames_Standard_Subprogram --
1598 ---------------------------------
1600 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1605 while Present
(Id
) loop
1606 if Scope
(Id
) = Standard_Standard
then
1614 end Renames_Standard_Subprogram
;
1616 -------------------------
1617 -- Set_Analyzed_Formal --
1618 -------------------------
1620 procedure Set_Analyzed_Formal
is
1624 while Present
(Analyzed_Formal
) loop
1625 Kind
:= Nkind
(Analyzed_Formal
);
1627 case Nkind
(Formal
) is
1628 when N_Formal_Subprogram_Declaration
=>
1629 exit when Kind
in N_Formal_Subprogram_Declaration
1632 (Defining_Unit_Name
(Specification
(Formal
))) =
1634 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1636 when N_Formal_Package_Declaration
=>
1637 exit when Kind
in N_Formal_Package_Declaration
1638 | N_Generic_Package_Declaration
1639 | N_Package_Declaration
;
1641 when N_Use_Package_Clause
1648 -- Skip freeze nodes, and nodes inserted to replace
1649 -- unrecognized pragmas.
1652 Kind
not in N_Formal_Subprogram_Declaration
1653 and then Kind
not in N_Subprogram_Declaration
1657 and then Chars
(Defining_Identifier
(Formal
)) =
1658 Chars
(Defining_Identifier
(Analyzed_Formal
));
1661 Next
(Analyzed_Formal
);
1663 end Set_Analyzed_Formal
;
1665 -- Start of processing for Analyze_Associations
1668 Actuals
:= Generic_Associations
(I_Node
);
1670 if Present
(Actuals
) then
1672 -- Check for an Others choice, indicating a partial parameterization
1673 -- for a formal package.
1675 Actual
:= First
(Actuals
);
1676 while Present
(Actual
) loop
1677 if Nkind
(Actual
) = N_Others_Choice
then
1678 Others_Present
:= True;
1679 Others_Choice
:= Actual
;
1681 if Present
(Next
(Actual
)) then
1682 Error_Msg_N
("OTHERS must be last association", Actual
);
1685 -- This subprogram is used both for formal packages and for
1686 -- instantiations. For the latter, associations must all be
1689 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1690 and then Comes_From_Source
(I_Node
)
1693 ("OTHERS association not allowed in an instance",
1697 -- In any case, nothing to do after the others association
1701 elsif Box_Present
(Actual
)
1702 and then Comes_From_Source
(I_Node
)
1703 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1706 ("box association not allowed in an instance", Actual
);
1712 -- If named associations are present, save first named association
1713 -- (it may of course be Empty) to facilitate subsequent name search.
1715 First_Named
:= First
(Actuals
);
1716 while Present
(First_Named
)
1717 and then Nkind
(First_Named
) /= N_Others_Choice
1718 and then No
(Selector_Name
(First_Named
))
1720 Num_Actuals
:= Num_Actuals
+ 1;
1725 Named
:= First_Named
;
1726 while Present
(Named
) loop
1727 if Nkind
(Named
) /= N_Others_Choice
1728 and then No
(Selector_Name
(Named
))
1730 Error_Msg_N
("invalid positional actual after named one", Named
);
1731 Abandon_Instantiation
(Named
);
1734 -- A named association may lack an actual parameter, if it was
1735 -- introduced for a default subprogram that turns out to be local
1736 -- to the outer instantiation. If it has a box association it must
1737 -- correspond to some formal in the generic.
1739 if Nkind
(Named
) /= N_Others_Choice
1740 and then (Present
(Explicit_Generic_Actual_Parameter
(Named
))
1741 or else Box_Present
(Named
))
1743 Num_Actuals
:= Num_Actuals
+ 1;
1749 if Present
(Formals
) then
1750 Formal
:= First_Non_Pragma
(Formals
);
1751 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1753 if Present
(Actuals
) then
1754 Actual
:= First
(Actuals
);
1756 -- All formals should have default values
1762 while Present
(Formal
) loop
1763 Set_Analyzed_Formal
;
1764 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1766 case Nkind
(Formal
) is
1767 when N_Formal_Object_Declaration
=>
1770 (Defining_Identifier
(Formal
),
1771 Defining_Identifier
(Analyzed_Formal
));
1773 if No
(Match
) and then Partial_Parameterization
then
1774 Process_Default
(Formal
);
1778 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1781 -- For a defaulted in_parameter, create an entry in the
1782 -- the list of defaulted actuals, for GNATprove use. Do
1783 -- not included these defaults for an instance nested
1784 -- within a generic, because the defaults are also used
1785 -- in the analysis of the enclosing generic, and only
1786 -- defaulted subprograms are relevant there.
1788 if No
(Match
) and then not Inside_A_Generic
then
1789 Append_To
(Default_Actuals
,
1790 Make_Generic_Association
(Sloc
(I_Node
),
1793 (Defining_Identifier
(Formal
), Sloc
(I_Node
)),
1794 Explicit_Generic_Actual_Parameter
=>
1795 New_Copy_Tree
(Default_Expression
(Formal
))));
1799 -- If the object is a call to an expression function, this
1800 -- is a freezing point for it.
1802 if Is_Entity_Name
(Match
)
1803 and then Present
(Entity
(Match
))
1805 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1806 = N_Expression_Function
1808 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1811 when N_Formal_Type_Declaration
=>
1814 (Defining_Identifier
(Formal
),
1815 Defining_Identifier
(Analyzed_Formal
));
1818 if Partial_Parameterization
then
1819 Process_Default
(Formal
);
1821 elsif Present
(Default_Subtype_Mark
(Formal
)) then
1822 Match
:= New_Copy
(Default_Subtype_Mark
(Formal
));
1825 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1827 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1830 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1833 Instantiation_Node
, Defining_Identifier
(Formal
));
1835 ("\in instantiation of & declared#",
1836 Instantiation_Node
, Gen_Unit
);
1837 Abandon_Instantiation
(Instantiation_Node
);
1844 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1847 -- Warn when an actual is a fixed-point with user-
1848 -- defined promitives. The warning is superfluous
1849 -- if the formal is private, because there can be
1850 -- no arithmetic operations in the generic so there
1851 -- no danger of confusion.
1853 if Is_Fixed_Point_Type
(Entity
(Match
))
1854 and then not Is_Private_Type
1855 (Defining_Identifier
(Analyzed_Formal
))
1857 Check_Fixed_Point_Actual
(Match
);
1860 -- An instantiation is a freeze point for the actuals,
1861 -- unless this is a rewritten formal package, or the
1862 -- formal is an Ada 2012 formal incomplete type.
1864 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1866 (Ada_Version
>= Ada_2012
1868 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1874 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1878 -- A remote access-to-class-wide type is not a legal actual
1879 -- for a generic formal of an access type (E.2.2(17/2)).
1880 -- In GNAT an exception to this rule is introduced when
1881 -- the formal is marked as remote using implementation
1882 -- defined aspect/pragma Remote_Access_Type. In that case
1883 -- the actual must be remote as well.
1885 -- If the current instantiation is the construction of a
1886 -- local copy for a formal package the actuals may be
1887 -- defaulted, and there is no matching actual to check.
1889 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1891 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1892 N_Access_To_Object_Definition
1893 and then Present
(Match
)
1896 Formal_Ent
: constant Entity_Id
:=
1897 Defining_Identifier
(Analyzed_Formal
);
1899 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1900 = Is_Remote_Types
(Formal_Ent
)
1902 -- Remoteness of formal and actual match
1906 elsif Is_Remote_Types
(Formal_Ent
) then
1908 -- Remote formal, non-remote actual
1911 ("actual for& must be remote", Match
, Formal_Ent
);
1914 -- Non-remote formal, remote actual
1917 ("actual for& may not be remote",
1923 when N_Formal_Subprogram_Declaration
=>
1926 (Defining_Unit_Name
(Specification
(Formal
)),
1927 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1929 -- If the formal subprogram has the same name as another
1930 -- formal subprogram of the generic, then a named
1931 -- association is illegal (12.3(9)). Exclude named
1932 -- associations that are generated for a nested instance.
1935 and then Is_Named_Assoc
1936 and then Comes_From_Source
(Found_Assoc
)
1938 Check_Overloaded_Formal_Subprogram
(Formal
);
1941 -- If there is no corresponding actual, this may be case
1942 -- of partial parameterization, or else the formal has a
1943 -- default or a box.
1945 if No
(Match
) and then Partial_Parameterization
then
1946 Process_Default
(Formal
);
1948 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1949 Check_Overloaded_Formal_Subprogram
(Formal
);
1953 Append_To
(Assoc_List
,
1954 Instantiate_Formal_Subprogram
1955 (Formal
, Match
, Analyzed_Formal
));
1957 -- If formal subprogram has contracts, create wrappers
1958 -- for it. This is an expansion activity that cannot
1959 -- take place e.g. within an enclosing generic unit.
1961 if Has_Contracts
(Analyzed_Formal
)
1962 and then (Expander_Active
or GNATprove_Mode
)
1964 Build_Subprogram_Wrappers
;
1967 -- An instantiation is a freeze point for the actuals,
1968 -- unless this is a rewritten formal package.
1970 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1971 and then Nkind
(Match
) = N_Identifier
1972 and then Is_Subprogram
(Entity
(Match
))
1974 -- The actual subprogram may rename a routine defined
1975 -- in Standard. Avoid freezing such renamings because
1976 -- subprograms coming from Standard cannot be frozen.
1979 not Renames_Standard_Subprogram
(Entity
(Match
))
1981 -- If the actual subprogram comes from a different
1982 -- unit, it is already frozen, either by a body in
1983 -- that unit or by the end of the declarative part
1984 -- of the unit. This check avoids the freezing of
1985 -- subprograms defined in Standard which are used
1986 -- as generic actuals.
1988 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1989 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1991 -- Mark the subprogram as having a delayed freeze
1992 -- since this may be an out-of-order action.
1994 Set_Has_Delayed_Freeze
(Entity
(Match
));
1995 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1999 -- If this is a nested generic, preserve default for later
2000 -- instantiations. We do this as well for GNATprove use,
2001 -- so that the list of generic associations is complete.
2003 if No
(Match
) and then Box_Present
(Formal
) then
2005 Subp
: constant Entity_Id
:=
2007 (Specification
(Last
(Assoc_List
)));
2010 Append_To
(Default_Actuals
,
2011 Make_Generic_Association
(Sloc
(I_Node
),
2013 New_Occurrence_Of
(Subp
, Sloc
(I_Node
)),
2014 Explicit_Generic_Actual_Parameter
=>
2015 New_Occurrence_Of
(Subp
, Sloc
(I_Node
))));
2019 when N_Formal_Package_Declaration
=>
2020 -- The name of the formal package may be hidden by the
2021 -- formal parameter itself.
2023 if Error_Posted
(Analyzed_Formal
) then
2024 Abandon_Instantiation
(Instantiation_Node
);
2029 (Defining_Identifier
(Formal
),
2031 (Original_Node
(Analyzed_Formal
)));
2035 if Partial_Parameterization
then
2036 Process_Default
(Formal
);
2039 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2042 Instantiation_Node
, Defining_Identifier
(Formal
));
2044 ("\in instantiation of & declared#",
2045 Instantiation_Node
, Gen_Unit
);
2047 Abandon_Instantiation
(Instantiation_Node
);
2053 (Instantiate_Formal_Package
2054 (Formal
, Match
, Analyzed_Formal
),
2057 -- Determine whether the actual package needs an explicit
2058 -- freeze node. This is only the case if the actual is
2059 -- declared in the same unit and has a body. Normally
2060 -- packages do not have explicit freeze nodes, and gigi
2061 -- only uses them to elaborate entities in a package
2064 Explicit_Freeze_Check
: declare
2065 Actual
: constant Entity_Id
:= Entity
(Match
);
2066 Gen_Par
: Entity_Id
;
2068 Needs_Freezing
: Boolean;
2071 procedure Check_Generic_Parent
;
2072 -- The actual may be an instantiation of a unit
2073 -- declared in a previous instantiation. If that
2074 -- one is also in the current compilation, it must
2075 -- itself be frozen before the actual. The actual
2076 -- may be an instantiation of a generic child unit,
2077 -- in which case the same applies to the instance
2078 -- of the parent which must be frozen before the
2080 -- Should this itself be recursive ???
2082 --------------------------
2083 -- Check_Generic_Parent --
2084 --------------------------
2086 procedure Check_Generic_Parent
is
2087 Inst
: constant Node_Id
:=
2088 Get_Unit_Instantiation_Node
(Actual
);
2094 if Nkind
(Parent
(Actual
)) = N_Package_Specification
2096 Par
:= Scope
(Generic_Parent
(Parent
(Actual
)));
2098 if Is_Generic_Instance
(Par
) then
2101 -- If the actual is a child generic unit, check
2102 -- whether the instantiation of the parent is
2103 -- also local and must also be frozen now. We
2104 -- must retrieve the instance node to locate the
2105 -- parent instance if any.
2107 elsif Ekind
(Par
) = E_Generic_Package
2108 and then Is_Child_Unit
(Gen_Par
)
2109 and then Ekind
(Scope
(Gen_Par
)) =
2112 if Nkind
(Inst
) = N_Package_Instantiation
2113 and then Nkind
(Name
(Inst
)) =
2116 -- Retrieve entity of parent instance
2118 Par
:= Entity
(Prefix
(Name
(Inst
)));
2127 and then Is_Generic_Instance
(Par
)
2128 and then Scope
(Par
) = Current_Scope
2130 (No
(Freeze_Node
(Par
))
2132 not Is_List_Member
(Freeze_Node
(Par
)))
2134 Set_Has_Delayed_Freeze
(Par
);
2135 Append_Elmt
(Par
, Actuals_To_Freeze
);
2137 end Check_Generic_Parent
;
2139 -- Start of processing for Explicit_Freeze_Check
2142 if Present
(Renamed_Entity
(Actual
)) then
2144 Generic_Parent
(Specification
2145 (Unit_Declaration_Node
2146 (Renamed_Entity
(Actual
))));
2149 Generic_Parent
(Specification
2150 (Unit_Declaration_Node
(Actual
)));
2153 if not Expander_Active
2154 or else not Has_Completion
(Actual
)
2155 or else not In_Same_Source_Unit
(I_Node
, Actual
)
2156 or else Is_Frozen
(Actual
)
2158 (Present
(Renamed_Entity
(Actual
))
2160 not In_Same_Source_Unit
2161 (I_Node
, (Renamed_Entity
(Actual
))))
2166 -- Finally we want to exclude such freeze nodes
2167 -- from statement sequences, which freeze
2168 -- everything before them.
2169 -- Is this strictly necessary ???
2171 Needs_Freezing
:= True;
2173 P
:= Parent
(I_Node
);
2174 while Nkind
(P
) /= N_Compilation_Unit
loop
2175 if Nkind
(P
) = N_Handled_Sequence_Of_Statements
2177 Needs_Freezing
:= False;
2184 if Needs_Freezing
then
2185 Check_Generic_Parent
;
2187 -- If the actual is a renaming of a proper
2188 -- instance of the formal package, indicate
2189 -- that it is the instance that must be frozen.
2191 if Nkind
(Parent
(Actual
)) =
2192 N_Package_Renaming_Declaration
2194 Set_Has_Delayed_Freeze
2195 (Renamed_Entity
(Actual
));
2197 (Renamed_Entity
(Actual
),
2200 Set_Has_Delayed_Freeze
(Actual
);
2201 Append_Elmt
(Actual
, Actuals_To_Freeze
);
2205 end Explicit_Freeze_Check
;
2208 -- For use type and use package appearing in the generic part,
2209 -- we have already copied them, so we can just move them where
2210 -- they belong (we mustn't recopy them since this would mess up
2211 -- the Sloc values).
2213 when N_Use_Package_Clause
2216 if Nkind
(Original_Node
(I_Node
)) =
2217 N_Formal_Package_Declaration
2219 Append
(New_Copy_Tree
(Formal
), Assoc_List
);
2222 Append
(Formal
, Assoc_List
);
2226 raise Program_Error
;
2229 -- Check here the correct use of Ghost entities in generic
2230 -- instantiations, as now the generic has been resolved and
2231 -- we know which formal generic parameters are ghost (SPARK
2234 if Nkind
(Formal
) not in N_Use_Package_Clause
2237 Check_Ghost_Context_In_Generic_Association
2239 Formal
=> Defining_Entity
(Analyzed_Formal
));
2242 Formal
:= Saved_Formal
;
2243 Next_Non_Pragma
(Analyzed_Formal
);
2246 if Num_Actuals
> Num_Matched
then
2247 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2249 if Present
(Selector_Name
(Actual
)) then
2251 ("unmatched actual &", Actual
, Selector_Name
(Actual
));
2253 ("\in instantiation of & declared#", Actual
, Gen_Unit
);
2256 ("unmatched actual in instantiation of & declared#",
2261 elsif Present
(Actuals
) then
2263 ("too many actuals in generic instantiation", Instantiation_Node
);
2266 -- An instantiation freezes all generic actuals. The only exceptions
2267 -- to this are incomplete types and subprograms which are not fully
2268 -- defined at the point of instantiation.
2271 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
2273 while Present
(Elmt
) loop
2274 Freeze_Before
(I_Node
, Node
(Elmt
));
2279 -- If there are default subprograms, normalize the tree by adding
2280 -- explicit associations for them. This is required if the instance
2281 -- appears within a generic.
2283 if not Is_Empty_List
(Default_Actuals
) then
2288 Default
:= First
(Default_Actuals
);
2289 while Present
(Default
) loop
2290 Mark_Rewrite_Insertion
(Default
);
2294 if No
(Actuals
) then
2295 Set_Generic_Associations
(I_Node
, Default_Actuals
);
2297 Append_List_To
(Actuals
, Default_Actuals
);
2302 -- If this is a formal package, normalize the parameter list by adding
2303 -- explicit box associations for the formals that are covered by an
2306 Append_List
(Default_Formals
, Formals
);
2309 end Analyze_Associations
;
2311 -------------------------------
2312 -- Analyze_Formal_Array_Type --
2313 -------------------------------
2315 procedure Analyze_Formal_Array_Type
2316 (T
: in out Entity_Id
;
2322 -- Treated like a non-generic array declaration, with additional
2327 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2328 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2329 while Present
(DSS
) loop
2330 if Nkind
(DSS
) in N_Subtype_Indication
2332 | N_Attribute_Reference
2334 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2341 Array_Type_Declaration
(T
, Def
);
2342 Set_Is_Generic_Type
(Base_Type
(T
));
2344 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2345 and then No
(Full_View
(Component_Type
(T
)))
2347 Error_Msg_N
("premature usage of incomplete type", Def
);
2349 -- Check that range constraint is not allowed on the component type
2350 -- of a generic formal array type (AARM 12.5.3(3))
2352 elsif Is_Internal
(Component_Type
(T
))
2353 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2354 and then Nkind
(Original_Node
2355 (Subtype_Indication
(Component_Definition
(Def
)))) =
2356 N_Subtype_Indication
2359 ("in a formal, a subtype indication can only be "
2360 & "a subtype mark (RM 12.5.3(3))",
2361 Subtype_Indication
(Component_Definition
(Def
)));
2364 end Analyze_Formal_Array_Type
;
2366 ---------------------------------------------
2367 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2368 ---------------------------------------------
2370 -- As for other generic types, we create a valid type representation with
2371 -- legal but arbitrary attributes, whose values are never considered
2372 -- static. For all scalar types we introduce an anonymous base type, with
2373 -- the same attributes. We choose the corresponding integer type to be
2374 -- Standard_Integer.
2375 -- Here and in other similar routines, the Sloc of the generated internal
2376 -- type must be the same as the sloc of the defining identifier of the
2377 -- formal type declaration, to provide proper source navigation.
2379 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2383 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2385 Base
: constant Entity_Id
:=
2387 (E_Decimal_Fixed_Point_Type
,
2389 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2391 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2392 Delta_Val
: constant Ureal
:= Ureal_1
;
2393 Digs_Val
: constant Uint
:= Uint_6
;
2395 function Make_Dummy_Bound
return Node_Id
;
2396 -- Return a properly typed universal real literal to use as a bound
2398 ----------------------
2399 -- Make_Dummy_Bound --
2400 ----------------------
2402 function Make_Dummy_Bound
return Node_Id
is
2403 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2405 Set_Etype
(Bound
, Universal_Real
);
2407 end Make_Dummy_Bound
;
2409 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2414 Set_Etype
(Base
, Base
);
2415 Set_Size_Info
(Base
, Int_Base
);
2416 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2417 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2418 Set_Digits_Value
(Base
, Digs_Val
);
2419 Set_Delta_Value
(Base
, Delta_Val
);
2420 Set_Small_Value
(Base
, Delta_Val
);
2421 Set_Scalar_Range
(Base
,
2423 Low_Bound
=> Make_Dummy_Bound
,
2424 High_Bound
=> Make_Dummy_Bound
));
2426 Set_Is_Generic_Type
(Base
);
2427 Set_Parent
(Base
, Parent
(Def
));
2429 Mutate_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2430 Set_Etype
(T
, Base
);
2431 Set_Size_Info
(T
, Int_Base
);
2432 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2433 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2434 Set_Digits_Value
(T
, Digs_Val
);
2435 Set_Delta_Value
(T
, Delta_Val
);
2436 Set_Small_Value
(T
, Delta_Val
);
2437 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2438 Set_Is_Constrained
(T
);
2440 Check_Restriction
(No_Fixed_Point
, Def
);
2441 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2443 -------------------------------------------
2444 -- Analyze_Formal_Derived_Interface_Type --
2445 -------------------------------------------
2447 procedure Analyze_Formal_Derived_Interface_Type
2452 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2455 -- Rewrite as a type declaration of a derived type. This ensures that
2456 -- the interface list and primitive operations are properly captured.
2459 Make_Full_Type_Declaration
(Loc
,
2460 Defining_Identifier
=> T
,
2461 Type_Definition
=> Def
));
2463 Set_Is_Generic_Type
(T
);
2464 end Analyze_Formal_Derived_Interface_Type
;
2466 ---------------------------------
2467 -- Analyze_Formal_Derived_Type --
2468 ---------------------------------
2470 procedure Analyze_Formal_Derived_Type
2475 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2476 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2480 Set_Is_Generic_Type
(T
);
2482 if Private_Present
(Def
) then
2484 Make_Private_Extension_Declaration
(Loc
,
2485 Defining_Identifier
=> T
,
2486 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2487 Unknown_Discriminants_Present
=> Unk_Disc
,
2488 Subtype_Indication
=> Subtype_Mark
(Def
),
2489 Interface_List
=> Interface_List
(Def
));
2491 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2492 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2493 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2497 Make_Full_Type_Declaration
(Loc
,
2498 Defining_Identifier
=> T
,
2499 Discriminant_Specifications
=>
2500 Discriminant_Specifications
(Parent
(T
)),
2502 Make_Derived_Type_Definition
(Loc
,
2503 Subtype_Indication
=> Subtype_Mark
(Def
)));
2505 Set_Abstract_Present
2506 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2508 (Type_Definition
(New_N
), Limited_Present
(Def
));
2515 if not Is_Composite_Type
(T
) then
2517 ("unknown discriminants not allowed for elementary types", N
);
2519 Set_Has_Unknown_Discriminants
(T
);
2520 Set_Is_Constrained
(T
, False);
2524 -- If the parent type has a known size, so does the formal, which makes
2525 -- legal representation clauses that involve the formal.
2527 Set_Size_Known_At_Compile_Time
2528 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2529 end Analyze_Formal_Derived_Type
;
2531 ----------------------------------
2532 -- Analyze_Formal_Discrete_Type --
2533 ----------------------------------
2535 -- The operations defined for a discrete types are those of an enumeration
2536 -- type. The size is set to an arbitrary value, for use in analyzing the
2539 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2540 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2544 Base
: constant Entity_Id
:=
2546 (E_Floating_Point_Type
, Current_Scope
,
2547 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2551 Mutate_Ekind
(T
, E_Enumeration_Subtype
);
2552 Set_Etype
(T
, Base
);
2554 Reinit_Alignment
(T
);
2555 Set_Is_Generic_Type
(T
);
2556 Set_Is_Constrained
(T
);
2558 -- For semantic analysis, the bounds of the type must be set to some
2559 -- non-static value. The simplest is to create attribute nodes for those
2560 -- bounds, that refer to the type itself. These bounds are never
2561 -- analyzed but serve as place-holders.
2564 Make_Attribute_Reference
(Loc
,
2565 Attribute_Name
=> Name_First
,
2566 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2570 Make_Attribute_Reference
(Loc
,
2571 Attribute_Name
=> Name_Last
,
2572 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2575 Set_Scalar_Range
(T
,
2580 Mutate_Ekind
(Base
, E_Enumeration_Type
);
2581 Set_Etype
(Base
, Base
);
2582 Init_Size
(Base
, 8);
2583 Reinit_Alignment
(Base
);
2584 Set_Is_Generic_Type
(Base
);
2585 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2586 Set_Parent
(Base
, Parent
(Def
));
2587 end Analyze_Formal_Discrete_Type
;
2589 ----------------------------------
2590 -- Analyze_Formal_Floating_Type --
2591 ---------------------------------
2593 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2594 Base
: constant Entity_Id
:=
2596 (E_Floating_Point_Type
, Current_Scope
,
2597 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2600 -- The various semantic attributes are taken from the predefined type
2601 -- Float, just so that all of them are initialized. Their values are
2602 -- never used because no constant folding or expansion takes place in
2603 -- the generic itself.
2606 Mutate_Ekind
(T
, E_Floating_Point_Subtype
);
2607 Set_Etype
(T
, Base
);
2608 Set_Size_Info
(T
, (Standard_Float
));
2609 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2610 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2611 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2612 Set_Is_Constrained
(T
);
2614 Set_Is_Generic_Type
(Base
);
2615 Set_Etype
(Base
, Base
);
2616 Set_Size_Info
(Base
, (Standard_Float
));
2617 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2618 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2619 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2620 Set_Parent
(Base
, Parent
(Def
));
2622 Check_Restriction
(No_Floating_Point
, Def
);
2623 end Analyze_Formal_Floating_Type
;
2625 -----------------------------------
2626 -- Analyze_Formal_Interface_Type;--
2627 -----------------------------------
2629 procedure Analyze_Formal_Interface_Type
2634 Loc
: constant Source_Ptr
:= Sloc
(N
);
2639 Make_Full_Type_Declaration
(Loc
,
2640 Defining_Identifier
=> T
,
2641 Type_Definition
=> Def
);
2645 Set_Is_Generic_Type
(T
);
2646 end Analyze_Formal_Interface_Type
;
2648 ---------------------------------
2649 -- Analyze_Formal_Modular_Type --
2650 ---------------------------------
2652 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2654 -- Apart from their entity kind, generic modular types are treated like
2655 -- signed integer types, and have the same attributes.
2657 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2658 Mutate_Ekind
(T
, E_Modular_Integer_Subtype
);
2659 Mutate_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2661 end Analyze_Formal_Modular_Type
;
2663 ---------------------------------------
2664 -- Analyze_Formal_Object_Declaration --
2665 ---------------------------------------
2667 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2668 E
: constant Node_Id
:= Default_Expression
(N
);
2669 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2672 Parent_Installed
: Boolean := False;
2678 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
2680 -- Determine the mode of the formal object
2682 if Out_Present
(N
) then
2683 K
:= E_Generic_In_Out_Parameter
;
2685 if not In_Present
(N
) then
2686 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2690 K
:= E_Generic_In_Parameter
;
2693 if Present
(Subtype_Mark
(N
)) then
2694 Find_Type
(Subtype_Mark
(N
));
2695 T
:= Entity
(Subtype_Mark
(N
));
2697 -- Verify that there is no redundant null exclusion
2699 if Null_Exclusion_Present
(N
) then
2700 if not Is_Access_Type
(T
) then
2702 ("null exclusion can only apply to an access type", N
);
2704 elsif Can_Never_Be_Null
(T
) then
2706 ("`NOT NULL` not allowed (& already excludes null)", N
, T
);
2710 -- Ada 2005 (AI-423): Formal object with an access definition
2713 Check_Access_Definition
(N
);
2714 T
:= Access_Definition
2716 N
=> Access_Definition
(N
));
2719 if Ekind
(T
) = E_Incomplete_Type
then
2721 Error_Node
: Node_Id
;
2724 if Present
(Subtype_Mark
(N
)) then
2725 Error_Node
:= Subtype_Mark
(N
);
2727 Check_Access_Definition
(N
);
2728 Error_Node
:= Access_Definition
(N
);
2731 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2735 if K
= E_Generic_In_Parameter
then
2737 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2739 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2741 ("generic formal of mode IN must not be of limited type", N
);
2742 Explain_Limited_Type
(T
, N
);
2745 if Is_Abstract_Type
(T
) then
2747 ("generic formal of mode IN must not be of abstract type", N
);
2751 Preanalyze_Spec_Expression
(E
, T
);
2753 -- The default for a ghost generic formal IN parameter of
2754 -- access-to-variable type should be a ghost object (SPARK
2757 if Is_Access_Variable
(T
) then
2758 Check_Ghost_Formal_Variable
2761 Is_Default
=> True);
2764 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2766 ("initialization not allowed for limited types", E
);
2767 Explain_Limited_Type
(T
, E
);
2771 Mutate_Ekind
(Id
, K
);
2774 -- Case of generic IN OUT parameter
2777 -- If the formal has an unconstrained type, construct its actual
2778 -- subtype, as is done for subprogram formals. In this fashion, all
2779 -- its uses can refer to specific bounds.
2781 Mutate_Ekind
(Id
, K
);
2784 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2785 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2788 Non_Freezing_Ref
: constant Node_Id
:=
2789 New_Occurrence_Of
(Id
, Sloc
(Id
));
2793 -- Make sure the actual subtype doesn't generate bogus freezing
2795 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2796 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2797 Insert_Before_And_Analyze
(N
, Decl
);
2798 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2801 Set_Actual_Subtype
(Id
, T
);
2806 ("initialization not allowed for `IN OUT` formals", N
);
2810 if Has_Aspects
(N
) then
2811 Analyze_Aspect_Specifications
(N
, Id
);
2814 if Parent_Installed
then
2817 end Analyze_Formal_Object_Declaration
;
2819 ----------------------------------------------
2820 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2821 ----------------------------------------------
2823 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2827 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2828 Base
: constant Entity_Id
:=
2830 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2831 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2834 -- The semantic attributes are set for completeness only, their values
2835 -- will never be used, since all properties of the type are non-static.
2838 Mutate_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2839 Set_Etype
(T
, Base
);
2840 Set_Size_Info
(T
, Standard_Integer
);
2841 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2842 Set_Small_Value
(T
, Ureal_1
);
2843 Set_Delta_Value
(T
, Ureal_1
);
2844 Set_Scalar_Range
(T
,
2846 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2847 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2848 Set_Is_Constrained
(T
);
2850 Set_Is_Generic_Type
(Base
);
2851 Set_Etype
(Base
, Base
);
2852 Set_Size_Info
(Base
, Standard_Integer
);
2853 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2854 Set_Small_Value
(Base
, Ureal_1
);
2855 Set_Delta_Value
(Base
, Ureal_1
);
2856 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2857 Set_Parent
(Base
, Parent
(Def
));
2859 Check_Restriction
(No_Fixed_Point
, Def
);
2860 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2862 ----------------------------------------
2863 -- Analyze_Formal_Package_Declaration --
2864 ----------------------------------------
2866 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2867 Gen_Id
: constant Node_Id
:= Name
(N
);
2868 Loc
: constant Source_Ptr
:= Sloc
(N
);
2869 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2872 Gen_Unit
: Entity_Id
;
2875 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2876 -- List of primitives made temporarily visible in the instantiation
2877 -- to match the visibility of the formal type.
2879 function Build_Local_Package
return Node_Id
;
2880 -- The formal package is rewritten so that its parameters are replaced
2881 -- with corresponding declarations. For parameters with bona fide
2882 -- associations these declarations are created by Analyze_Associations
2883 -- as for a regular instantiation. For boxed parameters, we preserve
2884 -- the formal declarations and analyze them, in order to introduce
2885 -- entities of the right kind in the environment of the formal.
2887 -------------------------
2888 -- Build_Local_Package --
2889 -------------------------
2891 function Build_Local_Package
return Node_Id
is
2893 Pack_Decl
: Node_Id
;
2896 -- Within the formal, the name of the generic package is a renaming
2897 -- of the formal (as for a regular instantiation).
2900 Make_Package_Declaration
(Loc
,
2903 (Specification
(Original_Node
(Gen_Decl
)),
2904 Empty
, Instantiating
=> True));
2907 Make_Package_Renaming_Declaration
(Loc
,
2908 Defining_Unit_Name
=>
2909 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2910 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2912 if Nkind
(Gen_Id
) = N_Identifier
2913 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2916 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2919 -- If the formal is declared with a box, or with an others choice,
2920 -- create corresponding declarations for all entities in the formal
2921 -- part, so that names with the proper types are available in the
2922 -- specification of the formal package.
2924 -- On the other hand, if there are no associations, then all the
2925 -- formals must have defaults, and this will be checked by the
2926 -- call to Analyze_Associations.
2929 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2932 Formal_Decl
: Node_Id
;
2935 -- TBA : for a formal package, need to recurse ???
2940 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2941 while Present
(Formal_Decl
) loop
2945 (Formal_Decl
, Empty
, Instantiating
=> True));
2950 -- If generic associations are present, use Analyze_Associations to
2951 -- create the proper renaming declarations.
2955 Act_Tree
: constant Node_Id
:=
2957 (Original_Node
(Gen_Decl
), Empty
,
2958 Instantiating
=> True);
2961 Generic_Renamings
.Set_Last
(0);
2962 Generic_Renamings_HTable
.Reset
;
2963 Instantiation_Node
:= N
;
2966 Analyze_Associations
2967 (I_Node
=> Original_Node
(N
),
2968 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2969 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2971 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2975 Append
(Renaming
, To
=> Decls
);
2977 -- Add generated declarations ahead of local declarations in
2980 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2981 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2984 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2989 end Build_Local_Package
;
2993 Save_ISMP
: constant Boolean := Ignore_SPARK_Mode_Pragmas_In_Instance
;
2994 -- Save flag Ignore_SPARK_Mode_Pragmas_In_Instance for restore on exit
2996 Associations
: Boolean := True;
2998 Parent_Installed
: Boolean := False;
2999 Parent_Instance
: Entity_Id
;
3000 Renaming_In_Par
: Entity_Id
;
3002 -- Start of processing for Analyze_Formal_Package_Declaration
3005 Check_Text_IO_Special_Unit
(Gen_Id
);
3008 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3009 Gen_Unit
:= Entity
(Gen_Id
);
3011 -- Check for a formal package that is a package renaming
3013 if Present
(Renamed_Entity
(Gen_Unit
)) then
3015 -- Indicate that unit is used, before replacing it with renamed
3016 -- entity for use below.
3018 if In_Extended_Main_Source_Unit
(N
) then
3019 Set_Is_Instantiated
(Gen_Unit
);
3020 Generate_Reference
(Gen_Unit
, N
);
3023 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
3026 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
3027 Error_Msg_N
("expect generic package name", Gen_Id
);
3031 elsif Gen_Unit
= Current_Scope
then
3033 ("generic package cannot be used as a formal package of itself",
3038 elsif In_Open_Scopes
(Gen_Unit
) then
3039 if Is_Compilation_Unit
(Gen_Unit
)
3040 and then Is_Child_Unit
(Current_Scope
)
3042 -- Special-case the error when the formal is a parent, and
3043 -- continue analysis to minimize cascaded errors.
3046 ("generic parent cannot be used as formal package of a child "
3051 ("generic package cannot be used as a formal package within "
3052 & "itself", Gen_Id
);
3058 -- Check that name of formal package does not hide name of generic,
3059 -- or its leading prefix. This check must be done separately because
3060 -- the name of the generic has already been analyzed.
3063 Gen_Name
: Entity_Id
;
3067 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
3068 Gen_Name
:= Prefix
(Gen_Name
);
3071 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
3073 ("& is hidden within declaration of formal package",
3079 or else No
(Generic_Associations
(N
))
3080 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
3082 Associations
:= False;
3085 -- If there are no generic associations, the generic parameters appear
3086 -- as local entities and are instantiated like them. We copy the generic
3087 -- package declaration as if it were an instantiation, and analyze it
3088 -- like a regular package, except that we treat the formals as
3089 -- additional visible components.
3091 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3093 if In_Extended_Main_Source_Unit
(N
) then
3094 Set_Is_Instantiated
(Gen_Unit
);
3095 Generate_Reference
(Gen_Unit
, N
);
3098 Formal
:= New_Copy
(Pack_Id
);
3099 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
3101 -- Make local generic without formals. The formals will be replaced with
3102 -- internal declarations.
3105 New_N
:= Build_Local_Package
;
3107 -- If there are errors in the parameter list, Analyze_Associations
3108 -- raises Instantiation_Error. Patch the declaration to prevent further
3109 -- exception propagation.
3112 when Instantiation_Error
=>
3113 Enter_Name
(Formal
);
3114 Mutate_Ekind
(Formal
, E_Variable
);
3115 Set_Etype
(Formal
, Any_Type
);
3116 Restore_Hidden_Primitives
(Vis_Prims_List
);
3118 if Parent_Installed
then
3126 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
3127 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
3128 Set_Instance_Env
(Gen_Unit
, Formal
);
3129 Set_Is_Generic_Instance
(Formal
);
3131 Enter_Name
(Formal
);
3132 Mutate_Ekind
(Formal
, E_Package
);
3133 Set_Etype
(Formal
, Standard_Void_Type
);
3134 Set_Inner_Instances
(Formal
, New_Elmt_List
);
3136 -- It is unclear that any aspects can apply to a formal package
3137 -- declaration, given that they look like a hidden conformance
3138 -- requirement on the corresponding actual. However, Abstract_State
3139 -- must be treated specially because it generates declarations that
3140 -- must appear before other declarations in the specification and
3141 -- must be analyzed at once.
3143 if Present
(Aspect_Specifications
(Gen_Decl
)) then
3144 if No
(Aspect_Specifications
(N
)) then
3145 Set_Aspect_Specifications
(N
, New_List
);
3149 ASN
: Node_Id
:= First
(Aspect_Specifications
(Gen_Decl
));
3153 while Present
(ASN
) loop
3154 if Get_Aspect_Id
(ASN
) = Aspect_Abstract_State
then
3156 Copy_Generic_Node
(ASN
, Empty
, Instantiating
=> True);
3157 Set_Entity
(New_A
, Formal
);
3158 Set_Analyzed
(New_A
, False);
3159 Append
(New_A
, Aspect_Specifications
(N
));
3160 Analyze_Aspect_Specifications
(N
, Formal
);
3169 Push_Scope
(Formal
);
3171 -- Manually set the SPARK_Mode from the context because the package
3172 -- declaration is never analyzed.
3174 Set_SPARK_Pragma
(Formal
, SPARK_Mode_Pragma
);
3175 Set_SPARK_Aux_Pragma
(Formal
, SPARK_Mode_Pragma
);
3176 Set_SPARK_Pragma_Inherited
(Formal
);
3177 Set_SPARK_Aux_Pragma_Inherited
(Formal
);
3179 if Is_Child_Unit
(Gen_Unit
) and then Parent_Installed
then
3181 -- Similarly, we have to make the name of the formal visible in the
3182 -- parent instance, to resolve properly fully qualified names that
3183 -- may appear in the generic unit. The parent instance has been
3184 -- placed on the scope stack ahead of the current scope.
3186 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
3189 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
3190 Mutate_Ekind
(Renaming_In_Par
, E_Package
);
3191 Set_Is_Not_Self_Hidden
(Renaming_In_Par
);
3192 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
3193 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
3194 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
3195 Set_Renamed_Entity
(Renaming_In_Par
, Formal
);
3196 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
3199 -- A formal package declaration behaves as a package instantiation with
3200 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
3201 -- missing, set the global flag which signals Analyze_Pragma to ingnore
3202 -- all SPARK_Mode pragmas within the generic_package_name.
3204 if SPARK_Mode
/= On
then
3205 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
3207 -- Mark the formal spec in case the body is instantiated at a later
3208 -- pass. This preserves the original context in effect for the body.
3210 Set_Ignore_SPARK_Mode_Pragmas
(Formal
);
3213 Analyze
(Specification
(N
));
3215 -- The formals for which associations are provided are not visible
3216 -- outside of the formal package. The others are still declared by a
3217 -- formal parameter declaration.
3219 -- If there are no associations, the only local entity to hide is the
3220 -- generated package renaming itself.
3226 E
:= First_Entity
(Formal
);
3227 while Present
(E
) loop
3228 if Associations
and then not Is_Generic_Formal
(E
) then
3232 if Ekind
(E
) = E_Package
and then Renamed_Entity
(E
) = Formal
then
3241 End_Package_Scope
(Formal
);
3242 Restore_Hidden_Primitives
(Vis_Prims_List
);
3244 if Parent_Installed
then
3250 -- Inside the generic unit, the formal package is a regular package, but
3251 -- no body is needed for it. Note that after instantiation, the defining
3252 -- unit name we need is in the new tree and not in the original (see
3253 -- Package_Instantiation). A generic formal package is an instance, and
3254 -- can be used as an actual for an inner instance.
3256 Set_Has_Completion
(Formal
, True);
3258 -- Add semantic information to the original defining identifier.
3260 Mutate_Ekind
(Pack_Id
, E_Package
);
3261 Set_Etype
(Pack_Id
, Standard_Void_Type
);
3262 Set_Scope
(Pack_Id
, Scope
(Formal
));
3263 Set_Has_Completion
(Pack_Id
, True);
3266 if Has_Aspects
(N
) then
3267 -- Unclear that any other aspects may appear here, analyze them
3268 -- for completion, given that the grammar allows their appearance.
3270 Analyze_Aspect_Specifications
(N
, Pack_Id
);
3273 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Save_ISMP
;
3274 end Analyze_Formal_Package_Declaration
;
3276 ---------------------------------
3277 -- Analyze_Formal_Private_Type --
3278 ---------------------------------
3280 procedure Analyze_Formal_Private_Type
3286 New_Private_Type
(N
, T
, Def
);
3288 -- Set the size to an arbitrary but legal value
3290 Set_Size_Info
(T
, Standard_Integer
);
3291 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3292 end Analyze_Formal_Private_Type
;
3294 ------------------------------------
3295 -- Analyze_Formal_Incomplete_Type --
3296 ------------------------------------
3298 procedure Analyze_Formal_Incomplete_Type
3304 Mutate_Ekind
(T
, E_Incomplete_Type
);
3306 Set_Private_Dependents
(T
, New_Elmt_List
);
3308 if Tagged_Present
(Def
) then
3309 Set_Is_Tagged_Type
(T
);
3310 Make_Class_Wide_Type
(T
);
3311 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
3313 end Analyze_Formal_Incomplete_Type
;
3315 ----------------------------------------
3316 -- Analyze_Formal_Signed_Integer_Type --
3317 ----------------------------------------
3319 procedure Analyze_Formal_Signed_Integer_Type
3323 Base
: constant Entity_Id
:=
3325 (E_Signed_Integer_Type
,
3327 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
3332 Mutate_Ekind
(T
, E_Signed_Integer_Subtype
);
3333 Set_Etype
(T
, Base
);
3334 Set_Size_Info
(T
, Standard_Integer
);
3335 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3336 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
3337 Set_Is_Constrained
(T
);
3339 Set_Is_Generic_Type
(Base
);
3340 Set_Size_Info
(Base
, Standard_Integer
);
3341 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
3342 Set_Etype
(Base
, Base
);
3343 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
3344 Set_Parent
(Base
, Parent
(Def
));
3345 end Analyze_Formal_Signed_Integer_Type
;
3347 -------------------------------------------
3348 -- Analyze_Formal_Subprogram_Declaration --
3349 -------------------------------------------
3351 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
3352 Spec
: constant Node_Id
:= Specification
(N
);
3353 Def
: constant Node_Id
:= Default_Name
(N
);
3354 Expr
: constant Node_Id
:= Expression
(N
);
3355 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
3357 Parent_Installed
: Boolean := False;
3365 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
3366 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3370 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
3372 Analyze_Subprogram_Declaration
(N
);
3373 Set_Is_Formal_Subprogram
(Nam
);
3374 Set_Has_Completion
(Nam
);
3376 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3377 Set_Is_Abstract_Subprogram
(Nam
);
3379 Set_Is_Dispatching_Operation
(Nam
);
3381 -- A formal abstract procedure cannot have a null default
3382 -- (RM 12.6(4.1/2)).
3384 if Nkind
(Spec
) = N_Procedure_Specification
3385 and then Null_Present
(Spec
)
3388 ("a formal abstract subprogram cannot default to null", Spec
);
3391 -- A formal abstract function cannot have an expression default
3392 -- (expression defaults are allowed for nonabstract formal functions
3393 -- when extensions are enabled).
3395 if Nkind
(Spec
) = N_Function_Specification
3396 and then Present
(Expr
)
3399 ("a formal abstract subprogram cannot default to an expression",
3404 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3406 if No
(Ctrl_Type
) then
3408 ("abstract formal subprogram must have a controlling type",
3411 elsif Ada_Version
>= Ada_2012
3412 and then Is_Incomplete_Type
(Ctrl_Type
)
3415 ("controlling type of abstract formal subprogram cannot "
3416 & "be incomplete type", N
, Ctrl_Type
);
3419 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3424 -- Default name is resolved at the point of instantiation
3426 if Box_Present
(N
) then
3429 -- Default name is bound at the point of generic declaration
3431 elsif Present
(Def
) then
3432 if Nkind
(Def
) = N_Operator_Symbol
then
3433 Find_Direct_Name
(Def
);
3435 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3439 -- For an attribute reference, analyze the prefix and verify
3440 -- that it has the proper profile for the subprogram.
3442 Analyze
(Prefix
(Def
));
3443 Valid_Default_Attribute
(Nam
, Def
);
3447 -- The default for a ghost generic formal procedure should be a ghost
3448 -- procedure (SPARK RM 6.9(13)).
3450 if Ekind
(Nam
) = E_Procedure
then
3452 Def_E
: Entity_Id
:= Empty
;
3454 if Nkind
(Def
) in N_Has_Entity
then
3455 Def_E
:= Entity
(Def
);
3458 Check_Ghost_Formal_Procedure_Or_Package
3462 Is_Default
=> True);
3466 -- Default name may be overloaded, in which case the interpretation
3467 -- with the correct profile must be selected, as for a renaming.
3468 -- If the definition is an indexed component, it must denote a
3469 -- member of an entry family. If it is a selected component, it
3470 -- can be a protected operation.
3472 if Etype
(Def
) = Any_Type
then
3475 elsif Nkind
(Def
) = N_Selected_Component
then
3476 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3477 Error_Msg_N
("expect valid subprogram name as default", Def
);
3480 elsif Nkind
(Def
) = N_Indexed_Component
then
3481 if Is_Entity_Name
(Prefix
(Def
)) then
3482 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3483 Error_Msg_N
("expect valid subprogram name as default", Def
);
3486 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3487 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3490 Error_Msg_N
("expect valid subprogram name as default", Def
);
3494 Error_Msg_N
("expect valid subprogram name as default", Def
);
3498 elsif Nkind
(Def
) = N_Character_Literal
then
3500 -- Needs some type checks: subprogram should be parameterless???
3502 Resolve
(Def
, (Etype
(Nam
)));
3504 elsif not Is_Entity_Name
(Def
)
3505 or else not Is_Overloadable
(Entity
(Def
))
3507 Error_Msg_N
("expect valid subprogram name as default", Def
);
3510 elsif not Is_Overloaded
(Def
) then
3511 Subp
:= Entity
(Def
);
3514 Error_Msg_N
("premature usage of formal subprogram", Def
);
3516 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3517 Error_Msg_N
("no visible entity matches specification", Def
);
3520 -- More than one interpretation, so disambiguate as for a renaming
3525 I1
: Interp_Index
:= 0;
3531 Get_First_Interp
(Def
, I
, It
);
3532 while Present
(It
.Nam
) loop
3533 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3534 if Subp
/= Any_Id
then
3535 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3537 if It1
= No_Interp
then
3538 Error_Msg_N
("ambiguous default subprogram", Def
);
3551 Get_Next_Interp
(I
, It
);
3555 if Subp
/= Any_Id
then
3557 -- Subprogram found, generate reference to it
3559 Set_Entity
(Def
, Subp
);
3560 Generate_Reference
(Subp
, Def
);
3563 Error_Msg_N
("premature usage of formal subprogram", Def
);
3565 elsif Ekind
(Subp
) /= E_Operator
then
3566 Check_Mode_Conformant
(Subp
, Nam
);
3570 Error_Msg_N
("no visible subprogram matches specification", N
);
3574 -- When extensions are enabled, an expression can be given as default
3575 -- for a formal function. The expression must be of the function result
3576 -- type and can reference formal parameters of the function.
3578 elsif Present
(Expr
) then
3580 Install_Formals
(Nam
);
3581 Preanalyze_Spec_Expression
(Expr
, Etype
(Nam
));
3586 if Has_Aspects
(N
) then
3587 Analyze_Aspect_Specifications
(N
, Nam
);
3590 if Parent_Installed
then
3593 end Analyze_Formal_Subprogram_Declaration
;
3595 -------------------------------------
3596 -- Analyze_Formal_Type_Declaration --
3597 -------------------------------------
3599 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3600 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3602 Parent_Installed
: Boolean := False;
3606 T
:= Defining_Identifier
(N
);
3608 if Present
(Discriminant_Specifications
(N
))
3609 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3612 ("discriminants not allowed for this formal type", T
);
3615 Check_Abbreviated_Instance
(Parent
(N
), Parent_Installed
);
3617 -- Enter the new name, and branch to specific routine
3620 when N_Formal_Private_Type_Definition
=>
3621 Analyze_Formal_Private_Type
(N
, T
, Def
);
3623 when N_Formal_Derived_Type_Definition
=>
3624 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3626 when N_Formal_Incomplete_Type_Definition
=>
3627 Analyze_Formal_Incomplete_Type
(T
, Def
);
3629 when N_Formal_Discrete_Type_Definition
=>
3630 Analyze_Formal_Discrete_Type
(T
, Def
);
3632 when N_Formal_Signed_Integer_Type_Definition
=>
3633 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3635 when N_Formal_Modular_Type_Definition
=>
3636 Analyze_Formal_Modular_Type
(T
, Def
);
3638 when N_Formal_Floating_Point_Definition
=>
3639 Analyze_Formal_Floating_Type
(T
, Def
);
3641 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3642 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3644 when N_Formal_Decimal_Fixed_Point_Definition
=>
3645 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3647 when N_Array_Type_Definition
=>
3648 Analyze_Formal_Array_Type
(T
, Def
);
3650 when N_Access_Function_Definition
3651 | N_Access_Procedure_Definition
3652 | N_Access_To_Object_Definition
3654 Analyze_Generic_Access_Type
(T
, Def
);
3656 -- Ada 2005: a interface declaration is encoded as an abstract
3657 -- record declaration or a abstract type derivation.
3659 when N_Record_Definition
=>
3660 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3662 when N_Derived_Type_Definition
=>
3663 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3669 raise Program_Error
;
3672 -- A formal type declaration declares a type and its first
3675 Set_Is_Generic_Type
(T
);
3676 Set_Is_First_Subtype
(T
);
3678 if Present
(Default_Subtype_Mark
(Original_Node
(N
))) then
3679 Validate_Formal_Type_Default
(N
);
3682 if Has_Aspects
(N
) then
3683 Analyze_Aspect_Specifications
(N
, T
);
3686 if Parent_Installed
then
3689 end Analyze_Formal_Type_Declaration
;
3691 ------------------------------------
3692 -- Analyze_Function_Instantiation --
3693 ------------------------------------
3695 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3697 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3698 end Analyze_Function_Instantiation
;
3700 ---------------------------------
3701 -- Analyze_Generic_Access_Type --
3702 ---------------------------------
3704 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3708 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3709 Access_Type_Declaration
(T
, Def
);
3711 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3712 and then No
(Full_View
(Designated_Type
(T
)))
3713 and then not Is_Generic_Type
(Designated_Type
(T
))
3715 Error_Msg_N
("premature usage of incomplete type", Def
);
3717 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3719 ("only a subtype mark is allowed in a formal", Def
);
3723 Access_Subprogram_Declaration
(T
, Def
);
3725 end Analyze_Generic_Access_Type
;
3727 ---------------------------------
3728 -- Analyze_Generic_Formal_Part --
3729 ---------------------------------
3731 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3732 Gen_Parm_Decl
: Node_Id
;
3735 -- The generic formals are processed in the scope of the generic unit,
3736 -- where they are immediately visible. The scope is installed by the
3739 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3740 while Present
(Gen_Parm_Decl
) loop
3741 Analyze
(Gen_Parm_Decl
);
3742 Next
(Gen_Parm_Decl
);
3745 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3747 -- For Ada 2022, some formal parameters can carry aspects, which must
3748 -- be name-resolved at the end of the list of formal parameters (which
3749 -- has the semantics of a declaration list).
3751 Analyze_Contracts
(Generic_Formal_Declarations
(N
));
3752 end Analyze_Generic_Formal_Part
;
3754 ------------------------------------------
3755 -- Analyze_Generic_Package_Declaration --
3756 ------------------------------------------
3758 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3759 Decls
: constant List_Id
:= Visible_Declarations
(Specification
(N
));
3760 Loc
: constant Source_Ptr
:= Sloc
(N
);
3766 Save_Parent
: Node_Id
;
3769 -- A generic may grant access to its private enclosing context depending
3770 -- on the placement of its corresponding body. From elaboration point of
3771 -- view, the flow of execution may enter this private context, and then
3772 -- reach an external unit, thus producing a dependency on that external
3773 -- unit. For such a path to be properly discovered and encoded in the
3774 -- ALI file of the main unit, let the ABE mechanism process the body of
3775 -- the main unit, and encode all relevant invocation constructs and the
3776 -- relations between them.
3778 Mark_Save_Invocation_Graph_Of_Body
;
3780 -- We introduce a renaming of the enclosing package, to have a usable
3781 -- entity as the prefix of an expanded name for a local entity of the
3782 -- form Par.P.Q, where P is the generic package. This is because a local
3783 -- entity named P may hide it, so that the usual visibility rules in
3784 -- the instance will not resolve properly.
3787 Make_Package_Renaming_Declaration
(Loc
,
3788 Defining_Unit_Name
=>
3789 Make_Defining_Identifier
(Loc
,
3790 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3792 Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3794 -- The declaration is inserted before other declarations, but before
3795 -- pragmas that may be library-unit pragmas and must appear before other
3796 -- declarations. The pragma Compile_Time_Error is not in this class, and
3797 -- may contain an expression that includes such a qualified name, so the
3798 -- renaming declaration must appear before it.
3800 -- Are there other pragmas that require this special handling ???
3802 if Present
(Decls
) then
3803 Decl
:= First
(Decls
);
3804 while Present
(Decl
)
3805 and then Nkind
(Decl
) = N_Pragma
3806 and then Get_Pragma_Id
(Decl
) /= Pragma_Compile_Time_Error
3811 if Present
(Decl
) then
3812 Insert_Before
(Decl
, Renaming
);
3814 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3818 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3821 -- Create copy of generic unit, and save for instantiation. If the unit
3822 -- is a child unit, do not copy the specifications for the parent, which
3823 -- are not part of the generic tree.
3825 Save_Parent
:= Parent_Spec
(N
);
3826 Set_Parent_Spec
(N
, Empty
);
3828 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3829 Set_Parent_Spec
(New_N
, Save_Parent
);
3832 -- Once the contents of the generic copy and the template are swapped,
3833 -- do the same for their respective aspect specifications.
3835 Exchange_Aspects
(N
, New_N
);
3837 -- Collect all contract-related source pragmas found within the template
3838 -- and attach them to the contract of the package spec. This contract is
3839 -- used in the capture of global references within annotations.
3841 Create_Generic_Contract
(N
);
3843 Id
:= Defining_Entity
(N
);
3844 Generate_Definition
(Id
);
3846 -- Expansion is not applied to generic units
3851 Mutate_Ekind
(Id
, E_Generic_Package
);
3852 Set_Is_Not_Self_Hidden
(Id
);
3853 Set_Etype
(Id
, Standard_Void_Type
);
3855 -- Set SPARK_Mode from context
3857 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3858 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
3859 Set_SPARK_Pragma_Inherited
(Id
);
3860 Set_SPARK_Aux_Pragma_Inherited
(Id
);
3862 -- Preserve relevant elaboration-related attributes of the context which
3863 -- are no longer available or very expensive to recompute once analysis,
3864 -- resolution, and expansion are over.
3866 Mark_Elaboration_Attributes
3871 -- Analyze aspects now, so that generated pragmas appear in the
3872 -- declarations before building and analyzing the generic copy.
3874 if Has_Aspects
(N
) then
3875 Analyze_Aspect_Specifications
(N
, Id
);
3879 Enter_Generic_Scope
(Id
);
3880 Set_Inner_Instances
(Id
, New_Elmt_List
);
3882 Set_Categorization_From_Pragmas
(N
);
3883 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3885 -- Link the declaration of the generic homonym in the generic copy to
3886 -- the package it renames, so that it is always resolved properly.
3888 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3889 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3891 -- For a library unit, we have reconstructed the entity for the unit,
3892 -- and must reset it in the library tables.
3894 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3895 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3898 Analyze_Generic_Formal_Part
(N
);
3900 -- After processing the generic formals, analysis proceeds as for a
3901 -- non-generic package.
3903 Analyze
(Specification
(N
));
3905 Validate_Categorization_Dependency
(N
, Id
);
3909 End_Package_Scope
(Id
);
3910 Exit_Generic_Scope
(Id
);
3912 -- If the generic appears within a package unit, the body of that unit
3913 -- has to be present for instantiation and inlining.
3915 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
then
3916 Set_Body_Needed_For_Inlining
3917 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3920 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3921 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3922 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3923 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3926 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3927 Validate_RT_RAT_Component
(N
);
3929 -- If this is a spec without a body, check that generic parameters
3932 if not Body_Required
(Parent
(N
)) then
3933 Check_References
(Id
);
3937 -- If there is a specified storage pool in the context, create an
3938 -- aspect on the package declaration, so that it is used in any
3939 -- instance that does not override it.
3941 if Present
(Default_Pool
) then
3947 Make_Aspect_Specification
(Loc
,
3948 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3949 Expression
=> New_Copy
(Default_Pool
));
3951 if No
(Aspect_Specifications
(Specification
(N
))) then
3952 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3954 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3958 end Analyze_Generic_Package_Declaration
;
3960 --------------------------------------------
3961 -- Analyze_Generic_Subprogram_Declaration --
3962 --------------------------------------------
3964 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3968 Result_Type
: Entity_Id
;
3969 Save_Parent
: Node_Id
;
3974 -- A generic may grant access to its private enclosing context depending
3975 -- on the placement of its corresponding body. From elaboration point of
3976 -- view, the flow of execution may enter this private context, and then
3977 -- reach an external unit, thus producing a dependency on that external
3978 -- unit. For such a path to be properly discovered and encoded in the
3979 -- ALI file of the main unit, let the ABE mechanism process the body of
3980 -- the main unit, and encode all relevant invocation constructs and the
3981 -- relations between them.
3983 Mark_Save_Invocation_Graph_Of_Body
;
3985 -- Create copy of generic unit, and save for instantiation. If the unit
3986 -- is a child unit, do not copy the specifications for the parent, which
3987 -- are not part of the generic tree.
3989 Save_Parent
:= Parent_Spec
(N
);
3990 Set_Parent_Spec
(N
, Empty
);
3992 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3993 Set_Parent_Spec
(New_N
, Save_Parent
);
3996 -- Once the contents of the generic copy and the template are swapped,
3997 -- do the same for their respective aspect specifications.
3999 Exchange_Aspects
(N
, New_N
);
4001 -- Collect all contract-related source pragmas found within the template
4002 -- and attach them to the contract of the subprogram spec. This contract
4003 -- is used in the capture of global references within annotations.
4005 Create_Generic_Contract
(N
);
4007 Spec
:= Specification
(N
);
4008 Id
:= Defining_Entity
(Spec
);
4009 Generate_Definition
(Id
);
4011 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
4013 ("operator symbol not allowed for generic subprogram", Id
);
4019 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
4022 Enter_Generic_Scope
(Id
);
4023 Set_Inner_Instances
(Id
, New_Elmt_List
);
4024 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
4026 Analyze_Generic_Formal_Part
(N
);
4028 if Nkind
(Spec
) = N_Function_Specification
then
4029 Mutate_Ekind
(Id
, E_Generic_Function
);
4031 Mutate_Ekind
(Id
, E_Generic_Procedure
);
4034 -- Set SPARK_Mode from context
4036 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
4037 Set_SPARK_Pragma_Inherited
(Id
);
4039 -- Preserve relevant elaboration-related attributes of the context which
4040 -- are no longer available or very expensive to recompute once analysis,
4041 -- resolution, and expansion are over.
4043 Mark_Elaboration_Attributes
4048 Formals
:= Parameter_Specifications
(Spec
);
4050 if Present
(Formals
) then
4051 Process_Formals
(Formals
, Spec
);
4054 if Nkind
(Spec
) = N_Function_Specification
then
4055 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
4056 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
4057 Set_Etype
(Id
, Result_Type
);
4059 -- Check restriction imposed by AI05-073: a generic function
4060 -- cannot return an abstract type or an access to such.
4062 if Is_Abstract_Type
(Designated_Type
(Result_Type
)) then
4064 ("generic function cannot have an access result "
4065 & "that designates an abstract type", Spec
);
4069 Find_Type
(Result_Definition
(Spec
));
4070 Typ
:= Entity
(Result_Definition
(Spec
));
4072 if Is_Abstract_Type
(Typ
)
4073 and then Ada_Version
>= Ada_2012
4076 ("generic function cannot have abstract result type", Spec
);
4079 -- If a null exclusion is imposed on the result type, then create
4080 -- a null-excluding itype (an access subtype) and use it as the
4081 -- function's Etype.
4083 if Is_Access_Type
(Typ
)
4084 and then Null_Exclusion_Present
(Spec
)
4087 Create_Null_Excluding_Itype
4089 Related_Nod
=> Spec
,
4090 Scope_Id
=> Defining_Unit_Name
(Spec
)));
4092 Set_Etype
(Id
, Typ
);
4097 Set_Etype
(Id
, Standard_Void_Type
);
4100 Set_Is_Not_Self_Hidden
(Id
);
4102 -- Analyze the aspects of the generic copy to ensure that all generated
4103 -- pragmas (if any) perform their semantic effects.
4105 if Has_Aspects
(N
) then
4106 Analyze_Aspect_Specifications
(N
, Id
);
4109 -- For a library unit, we have reconstructed the entity for the unit,
4110 -- and must reset it in the library tables. We also make sure that
4111 -- Body_Required is set properly in the original compilation unit node.
4113 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4114 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
4115 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
4118 -- If the generic appears within a package unit, the body of that unit
4119 -- has to be present for instantiation and inlining.
4121 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
4122 and then Unit_Requires_Body
(Id
)
4124 Set_Body_Needed_For_Inlining
4125 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
4128 Set_Categorization_From_Pragmas
(N
);
4129 Validate_Categorization_Dependency
(N
, Id
);
4131 -- Capture all global references that occur within the profile of the
4132 -- generic subprogram. Aspects are not part of this processing because
4133 -- they must be delayed. If processed now, Save_Global_References will
4134 -- destroy the Associated_Node links and prevent the capture of global
4135 -- references when the contract of the generic subprogram is analyzed.
4137 Save_Global_References
(Original_Node
(N
));
4141 Exit_Generic_Scope
(Id
);
4142 Generate_Reference_To_Formals
(Id
);
4144 List_Inherited_Pre_Post_Aspects
(Id
);
4145 end Analyze_Generic_Subprogram_Declaration
;
4147 -----------------------------------
4148 -- Analyze_Package_Instantiation --
4149 -----------------------------------
4151 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
4152 -- must be replaced by gotos which jump to the end of the routine in order
4153 -- to restore the Ghost and SPARK modes.
4155 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
4156 Has_Inline_Always
: Boolean := False;
4157 -- Set if the generic unit contains any subprograms with Inline_Always.
4158 -- Only relevant when back-end inlining is not enabled.
4160 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean;
4161 -- Return True if inlining is active and Gen_Unit contains inlined
4162 -- subprograms. In this case, we may either instantiate the body when
4163 -- front-end inlining is enabled, or add a pending instantiation when
4164 -- back-end inlining is enabled. In the former case, this may cause
4165 -- superfluous instantiations, but in either case we need to perform
4166 -- the instantiation of the body in the context of the instance and
4167 -- not in that of the point of inlining.
4169 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean;
4170 -- Return True if Gen_Unit needs to have its body instantiated in the
4171 -- context of N. This in particular excludes generic contexts.
4173 -----------------------
4174 -- Might_Inline_Subp --
4175 -----------------------
4177 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean is
4181 if Inline_Processing_Required
then
4182 -- No need to recompute the answer if we know it is positive
4183 -- and back-end inlining is enabled.
4185 if Is_Inlined
(Gen_Unit
) and then Back_End_Inlining
then
4189 E
:= First_Entity
(Gen_Unit
);
4190 while Present
(E
) loop
4191 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
4192 -- Remember if there are any subprograms with Inline_Always
4194 if Has_Pragma_Inline_Always
(E
) then
4195 Has_Inline_Always
:= True;
4198 Set_Is_Inlined
(Gen_Unit
);
4207 end Might_Inline_Subp
;
4209 -------------------------------
4210 -- Needs_Body_Instantiated --
4211 -------------------------------
4213 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean is
4215 -- No need to instantiate bodies in generic units
4217 if Is_Generic_Unit
(Cunit_Entity
(Main_Unit
)) then
4221 -- If the instantiation is in the main unit, then the body is needed
4223 if Is_In_Main_Unit
(N
) then
4227 -- In GNATprove mode, never instantiate bodies outside of the main
4228 -- unit, as it does not use frontend/backend inlining in the way that
4229 -- GNAT does, so does not benefit from such instantiations. On the
4230 -- contrary, such instantiations may bring artificial constraints,
4231 -- as for example such bodies may require preprocessing.
4233 if GNATprove_Mode
then
4237 -- If not, then again no need to instantiate bodies in generic units
4239 if Is_Generic_Unit
(Cunit_Entity
(Get_Code_Unit
(N
))) then
4243 -- Here we have a special handling for back-end inlining: if inline
4244 -- processing is required, then we unconditionally want to have the
4245 -- body instantiated. The reason is that Might_Inline_Subp does not
4246 -- catch all the cases (as it does not recurse into nested packages)
4247 -- so this avoids the need to patch things up afterwards. Moreover,
4248 -- these instantiations are only performed on demand when back-end
4249 -- inlining is enabled, so this causes very little extra work.
4251 if Inline_Processing_Required
and then Back_End_Inlining
then
4255 -- We want to have the bodies instantiated in non-main units if
4256 -- they might contribute inlined subprograms.
4258 return Might_Inline_Subp
(Gen_Unit
);
4259 end Needs_Body_Instantiated
;
4261 -- Local declarations
4263 Gen_Id
: constant Node_Id
:= Name
(N
);
4264 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
4265 Is_Actual_Pack
: constant Boolean := Is_Internal
(Inst_Id
);
4266 Loc
: constant Source_Ptr
:= Sloc
(N
);
4268 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4269 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
4270 Saved_ISMP
: constant Boolean :=
4271 Ignore_SPARK_Mode_Pragmas_In_Instance
;
4272 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4273 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4274 -- Save the Ghost and SPARK mode-related data to restore on exit
4276 Saved_Style_Check
: constant Boolean := Style_Check
;
4277 -- Save style check mode for restore on exit
4280 Act_Decl_Name
: Node_Id
;
4281 Act_Decl_Id
: Entity_Id
;
4284 Env_Installed
: Boolean := False;
4287 Gen_Unit
: Entity_Id
;
4288 Inline_Now
: Boolean := False;
4289 Needs_Body
: Boolean;
4290 Parent_Installed
: Boolean := False;
4291 Renaming_List
: List_Id
;
4292 Unit_Renaming
: Node_Id
;
4294 Vis_Prims_List
: Elist_Id
:= No_Elist
;
4295 -- List of primitives made temporarily visible in the instantiation
4296 -- to match the visibility of the formal type
4298 -- Start of processing for Analyze_Package_Instantiation
4301 -- Preserve relevant elaboration-related attributes of the context which
4302 -- are no longer available or very expensive to recompute once analysis,
4303 -- resolution, and expansion are over.
4305 Mark_Elaboration_Attributes
4312 -- Very first thing: check for Text_IO special unit in case we are
4313 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
4315 Check_Text_IO_Special_Unit
(Name
(N
));
4317 -- Make node global for error reporting
4319 Instantiation_Node
:= N
;
4321 -- Case of instantiation of a generic package
4323 if Nkind
(N
) = N_Package_Instantiation
then
4324 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4326 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
4328 Make_Defining_Program_Unit_Name
(Loc
,
4330 New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
4331 Defining_Identifier
=> Act_Decl_Id
);
4333 Act_Decl_Name
:= Act_Decl_Id
;
4336 -- Case of instantiation of a formal package
4339 Act_Decl_Id
:= Defining_Identifier
(N
);
4340 Act_Decl_Name
:= Act_Decl_Id
;
4343 Generate_Definition
(Act_Decl_Id
);
4344 Mutate_Ekind
(Act_Decl_Id
, E_Package
);
4345 Set_Is_Not_Self_Hidden
(Act_Decl_Id
);
4347 -- Initialize list of incomplete actuals before analysis
4349 Set_Incomplete_Actuals
(Act_Decl_Id
, New_Elmt_List
);
4351 Preanalyze_Actuals
(N
, Act_Decl_Id
);
4353 -- Turn off style checking in instances. If the check is enabled on the
4354 -- generic unit, a warning in an instance would just be noise. If not
4355 -- enabled on the generic, then a warning in an instance is just wrong.
4356 -- This must be done after analyzing the actuals, which do come from
4357 -- source and are subject to style checking.
4359 Style_Check
:= False;
4362 Env_Installed
:= True;
4364 -- Reset renaming map for formal types. The mapping is established
4365 -- when analyzing the generic associations, but some mappings are
4366 -- inherited from formal packages of parent units, and these are
4367 -- constructed when the parents are installed.
4369 Generic_Renamings
.Set_Last
(0);
4370 Generic_Renamings_HTable
.Reset
;
4372 -- Except for an abbreviated instance created to check a formal package,
4373 -- install the parent if this is a generic child unit.
4375 if not Is_Abbreviated_Instance
(Inst_Id
) then
4376 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4379 Gen_Unit
:= Entity
(Gen_Id
);
4381 -- A package instantiation is Ghost when it is subject to pragma Ghost
4382 -- or the generic template is Ghost. Set the mode now to ensure that
4383 -- any nodes generated during analysis and expansion are marked as
4386 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
4388 -- Verify that it is the name of a generic package
4390 -- A visibility glitch: if the instance is a child unit and the generic
4391 -- is the generic unit of a parent instance (i.e. both the parent and
4392 -- the child units are instances of the same package) the name now
4393 -- denotes the renaming within the parent, not the intended generic
4394 -- unit. See if there is a homonym that is the desired generic. The
4395 -- renaming declaration must be visible inside the instance of the
4396 -- child, but not when analyzing the name in the instantiation itself.
4398 if Ekind
(Gen_Unit
) = E_Package
4399 and then Present
(Renamed_Entity
(Gen_Unit
))
4400 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
4401 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
4402 and then Present
(Homonym
(Gen_Unit
))
4404 Gen_Unit
:= Homonym
(Gen_Unit
);
4407 if Etype
(Gen_Unit
) = Any_Type
then
4411 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
4413 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
4415 if From_Limited_With
(Gen_Unit
) then
4417 ("cannot instantiate a limited withed package", Gen_Id
);
4420 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
4427 if In_Extended_Main_Source_Unit
(N
) then
4428 Set_Is_Instantiated
(Gen_Unit
);
4429 Generate_Reference
(Gen_Unit
, N
);
4431 if Present
(Renamed_Entity
(Gen_Unit
)) then
4432 Set_Is_Instantiated
(Renamed_Entity
(Gen_Unit
));
4433 Generate_Reference
(Renamed_Entity
(Gen_Unit
), N
);
4437 if Nkind
(Gen_Id
) = N_Identifier
4438 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4441 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4443 elsif Nkind
(Gen_Id
) = N_Expanded_Name
4444 and then Is_Child_Unit
(Gen_Unit
)
4445 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
4446 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
4449 ("& is hidden within declaration of instance", Prefix
(Gen_Id
));
4452 Set_Entity
(Gen_Id
, Gen_Unit
);
4454 -- If generic is a renaming, get original generic unit
4456 if Present
(Renamed_Entity
(Gen_Unit
))
4457 and then Ekind
(Renamed_Entity
(Gen_Unit
)) = E_Generic_Package
4459 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
4462 -- Verify that there are no circular instantiations
4464 if In_Open_Scopes
(Gen_Unit
) then
4465 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4469 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4470 Error_Msg_Node_2
:= Current_Scope
;
4472 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
4473 Circularity_Detected
:= True;
4478 Mutate_Ekind
(Inst_Id
, E_Package
);
4479 Set_Scope
(Inst_Id
, Current_Scope
);
4481 -- If the context of the instance is subject to SPARK_Mode "off" or
4482 -- the annotation is altogether missing, set the global flag which
4483 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
4486 if SPARK_Mode
/= On
then
4487 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4489 -- Mark the instance spec in case the body is instantiated at a
4490 -- later pass. This preserves the original context in effect for
4493 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
4496 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4497 Gen_Spec
:= Specification
(Gen_Decl
);
4499 -- Initialize renamings map, for error checking, and the list that
4500 -- holds private entities whose views have changed between generic
4501 -- definition and instantiation. If this is the instance created to
4502 -- validate an actual package, the instantiation environment is that
4503 -- of the enclosing instance.
4505 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
4507 -- Copy original generic tree, to produce text for instantiation
4511 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4513 Act_Spec
:= Specification
(Act_Tree
);
4515 -- If this is the instance created to validate an actual package,
4516 -- only the formals matter, do not examine the package spec itself.
4518 if Is_Actual_Pack
then
4519 Set_Visible_Declarations
(Act_Spec
, New_List
);
4520 Set_Private_Declarations
(Act_Spec
, New_List
);
4524 Analyze_Associations
4526 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4527 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4529 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4531 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
4532 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
4533 Set_Is_Generic_Instance
(Act_Decl_Id
);
4534 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4536 -- References to the generic in its own declaration or its body are
4537 -- references to the instance. Add a renaming declaration for the
4538 -- generic unit itself. This declaration, as well as the renaming
4539 -- declarations for the generic formals, must remain private to the
4540 -- unit: the formals, because this is the language semantics, and
4541 -- the unit because its use is an artifact of the implementation.
4544 Make_Package_Renaming_Declaration
(Loc
,
4545 Defining_Unit_Name
=>
4546 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
4547 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
4549 Append
(Unit_Renaming
, Renaming_List
);
4551 -- The renaming declarations are the first local declarations of the
4554 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
4556 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
4558 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
4561 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
4563 -- Propagate the aspect specifications from the package declaration
4564 -- template to the instantiated version of the package declaration.
4566 if Has_Aspects
(Act_Tree
) then
4567 Set_Aspect_Specifications
(Act_Decl
,
4568 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
4571 -- The generic may have a generated Default_Storage_Pool aspect,
4572 -- set at the point of generic declaration. If the instance has
4573 -- that aspect, it overrides the one inherited from the generic.
4575 if Has_Aspects
(Gen_Spec
) then
4576 if No
(Aspect_Specifications
(N
)) then
4577 Set_Aspect_Specifications
(N
,
4579 (Aspect_Specifications
(Gen_Spec
))));
4583 Inherited_Aspects
: constant List_Id
:=
4585 (Aspect_Specifications
(Gen_Spec
));
4589 Pool_Present
: Boolean := False;
4592 ASN1
:= First
(Aspect_Specifications
(N
));
4593 while Present
(ASN1
) loop
4594 if Chars
(Identifier
(ASN1
)) =
4595 Name_Default_Storage_Pool
4597 Pool_Present
:= True;
4604 if Pool_Present
then
4606 -- If generic carries a default storage pool, remove it
4607 -- in favor of the instance one.
4609 ASN2
:= First
(Inherited_Aspects
);
4610 while Present
(ASN2
) loop
4611 if Chars
(Identifier
(ASN2
)) =
4612 Name_Default_Storage_Pool
4623 (Aspect_Specifications
(N
), Inherited_Aspects
);
4628 -- Save the instantiation node for a subsequent instantiation of the
4629 -- body if there is one and it needs to be instantiated here.
4631 -- We instantiate the body only if we are generating code, or if we
4632 -- are generating cross-reference information, or for GNATprove use.
4635 Enclosing_Body_Present
: Boolean := False;
4636 -- If the generic unit is not a compilation unit, then a body may
4637 -- be present in its parent even if none is required. We create a
4638 -- tentative pending instantiation for the body, which will be
4639 -- discarded if none is actually present.
4644 if Scope
(Gen_Unit
) /= Standard_Standard
4645 and then not Is_Child_Unit
(Gen_Unit
)
4647 Scop
:= Scope
(Gen_Unit
);
4648 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
4649 if Unit_Requires_Body
(Scop
) then
4650 Enclosing_Body_Present
:= True;
4653 elsif In_Open_Scopes
(Scop
)
4654 and then In_Package_Body
(Scop
)
4656 Enclosing_Body_Present
:= True;
4660 exit when Is_Compilation_Unit
(Scop
);
4661 Scop
:= Scope
(Scop
);
4665 -- If front-end inlining is enabled or there are any subprograms
4666 -- marked with Inline_Always, and this is a unit for which code
4667 -- will be generated, we instantiate the body at once.
4669 -- This is done if the instance is not the main unit, and if the
4670 -- generic is not a child unit of another generic, to avoid scope
4671 -- problems and the reinstallation of parent instances.
4674 and then (not Is_Child_Unit
(Gen_Unit
)
4675 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4676 and then Might_Inline_Subp
(Gen_Unit
)
4677 and then not Is_Actual_Pack
4679 if not Back_End_Inlining
4680 and then (Front_End_Inlining
or else Has_Inline_Always
)
4681 and then (Is_In_Main_Unit
(N
)
4682 or else In_Main_Context
(Current_Scope
))
4683 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4687 -- In configurable_run_time mode we force the inlining of
4688 -- predefined subprograms marked Inline_Always, to minimize
4689 -- the use of the run-time library.
4691 elsif In_Predefined_Unit
(Gen_Decl
)
4692 and then Configurable_Run_Time_Mode
4693 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4698 -- If the current scope is itself an instance within a child
4699 -- unit, there will be duplications in the scope stack, and the
4700 -- unstacking mechanism in Inline_Instance_Body will fail.
4701 -- This loses some rare cases of optimization.
4703 if Is_Generic_Instance
(Current_Scope
) then
4705 Curr_Unit
: constant Entity_Id
:=
4706 Cunit_Entity
(Current_Sem_Unit
);
4708 if Curr_Unit
/= Current_Scope
4709 and then Is_Child_Unit
(Curr_Unit
)
4711 Inline_Now
:= False;
4718 (Unit_Requires_Body
(Gen_Unit
)
4719 or else Enclosing_Body_Present
4720 or else Present
(Corresponding_Body
(Gen_Decl
)))
4721 and then Needs_Body_Instantiated
(Gen_Unit
)
4722 and then not Is_Actual_Pack
4723 and then not Inline_Now
4724 and then (Operating_Mode
= Generate_Code
4725 or else (Operating_Mode
= Check_Semantics
4726 and then GNATprove_Mode
));
4728 -- If front-end inlining is enabled or there are any subprograms
4729 -- marked with Inline_Always, do not instantiate body when within
4730 -- a generic context.
4732 if not Back_End_Inlining
4733 and then (Front_End_Inlining
or else Has_Inline_Always
)
4734 and then not Expander_Active
4736 Needs_Body
:= False;
4739 -- If the current context is generic, and the package being
4740 -- instantiated is declared within a formal package, there is no
4741 -- body to instantiate until the enclosing generic is instantiated
4742 -- and there is an actual for the formal package. If the formal
4743 -- package has parameters, we build a regular package instance for
4744 -- it, that precedes the original formal package declaration.
4746 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4748 Decl
: constant Node_Id
:=
4750 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4752 if Nkind
(Decl
) = N_Formal_Package_Declaration
4753 or else (Nkind
(Decl
) = N_Package_Declaration
4754 and then Is_List_Member
(Decl
)
4755 and then Present
(Next
(Decl
))
4757 Nkind
(Next
(Decl
)) =
4758 N_Formal_Package_Declaration
)
4760 Needs_Body
:= False;
4766 -- For RCI unit calling stubs, we omit the instance body if the
4767 -- instance is the RCI library unit itself.
4769 -- However there is a special case for nested instances: in this case
4770 -- we do generate the instance body, as it might be required, e.g.
4771 -- because it provides stream attributes for some type used in the
4772 -- profile of a remote subprogram. This is consistent with 12.3(12),
4773 -- which indicates that the instance body occurs at the place of the
4774 -- instantiation, and thus is part of the RCI declaration, which is
4775 -- present on all client partitions (this is E.2.3(18)).
4777 -- Note that AI12-0002 may make it illegal at some point to have
4778 -- stream attributes defined in an RCI unit, in which case this
4779 -- special case will become unnecessary. In the meantime, there
4780 -- is known application code in production that depends on this
4781 -- being possible, so we definitely cannot eliminate the body in
4782 -- the case of nested instances for the time being.
4784 -- When we generate a nested instance body, calling stubs for any
4785 -- relevant subprogram will be inserted immediately after the
4786 -- subprogram declarations, and will take precedence over the
4787 -- subsequent (original) body. (The stub and original body will be
4788 -- complete homographs, but this is permitted in an instance).
4789 -- (Could we do better and remove the original body???)
4791 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4792 and then Comes_From_Source
(N
)
4793 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4795 Needs_Body
:= False;
4798 -- If the context requires a full instantiation, set things up for
4799 -- subsequent construction of the body.
4803 Fin_Scop
, S
: Entity_Id
;
4806 Check_Forward_Instantiation
(Gen_Decl
);
4810 -- For a package instantiation that is not a compilation unit,
4811 -- indicate that cleanup actions of the innermost enclosing
4812 -- scope for which they are generated should be delayed until
4813 -- after the package body is instantiated.
4815 if Nkind
(N
) = N_Package_Instantiation
4816 and then not Is_Compilation_Unit
(Act_Decl_Id
)
4820 while S
/= Standard_Standard
loop
4821 -- Cleanup actions are not generated within generic units
4822 -- or in the formal part of generic units.
4825 or else Is_Generic_Unit
(S
)
4826 or else Ekind
(S
) = E_Void
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 if Has_Aspects
(N
) then
4944 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4948 Set_Unit
(Parent
(N
), N
);
4949 Set_Body_Required
(Parent
(N
), False);
4951 -- We never need elaboration checks on instantiations, since by
4952 -- definition, the body instantiation is elaborated at the same
4953 -- time as the spec instantiation.
4955 if Legacy_Elaboration_Checks
then
4956 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4957 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4961 if Legacy_Elaboration_Checks
then
4962 Check_Elab_Instantiation
(N
);
4965 -- Save the scenario for later examination by the ABE Processing
4968 Record_Elaboration_Scenario
(N
);
4970 -- The instantiation results in a guaranteed ABE
4972 if Is_Known_Guaranteed_ABE
(N
) and then Needs_Body
then
4973 -- Do not instantiate the corresponding body because gigi cannot
4974 -- handle certain types of premature instantiations.
4976 Remove_Dead_Instance
(N
);
4978 -- Create completing bodies for all subprogram declarations since
4979 -- their real bodies will not be instantiated.
4981 Provide_Completing_Bodies
(Instance_Spec
(N
));
4984 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4986 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4987 First_Private_Entity
(Act_Decl_Id
));
4989 -- If the instantiation needs a body, the unit will be turned into
4990 -- a package body and receive its own elaboration entity. Otherwise,
4991 -- the nature of the unit is now a package declaration.
4993 -- Note that the below rewriting means that Act_Decl, which has been
4994 -- analyzed and expanded, will be re-expanded as the rewritten N.
4996 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4997 and then not Needs_Body
4999 Rewrite
(N
, Act_Decl
);
5002 if Present
(Corresponding_Body
(Gen_Decl
))
5003 or else Unit_Requires_Body
(Gen_Unit
)
5005 Set_Has_Completion
(Act_Decl_Id
);
5008 Check_Formal_Packages
(Act_Decl_Id
);
5010 Restore_Hidden_Primitives
(Vis_Prims_List
);
5011 Restore_Private_Views
(Act_Decl_Id
);
5013 Inherit_Context
(Gen_Decl
, N
);
5015 if Parent_Installed
then
5020 Env_Installed
:= False;
5023 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5025 -- There used to be a check here to prevent instantiations in local
5026 -- contexts if the No_Local_Allocators restriction was active. This
5027 -- check was removed by a binding interpretation in AI-95-00130/07,
5028 -- but we retain the code for documentation purposes.
5030 -- if Ekind (Act_Decl_Id) /= E_Void
5031 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
5033 -- Check_Restriction (No_Local_Allocators, N);
5037 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
5040 -- Check that if N is an instantiation of System.Dim_Float_IO or
5041 -- System.Dim_Integer_IO, the formal type has a dimension system.
5043 if Nkind
(N
) = N_Package_Instantiation
5044 and then Is_Dim_IO_Package_Instantiation
(N
)
5047 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
5049 if not Has_Dimension_System
5050 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
5052 Error_Msg_N
("type with a dimension system expected", Assoc
);
5058 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5059 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5062 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5063 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5064 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5065 Style_Check
:= Saved_Style_Check
;
5068 when Instantiation_Error
=>
5069 if Parent_Installed
then
5073 if Env_Installed
then
5077 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5078 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5079 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5080 Style_Check
:= Saved_Style_Check
;
5081 end Analyze_Package_Instantiation
;
5083 --------------------------
5084 -- Inline_Instance_Body --
5085 --------------------------
5087 -- WARNING: This routine manages SPARK regions. Return statements must be
5088 -- replaced by gotos which jump to the end of the routine and restore the
5091 procedure Inline_Instance_Body
5093 Gen_Unit
: Entity_Id
;
5096 Config_Attrs
: constant Config_Switches_Type
:= Save_Config_Switches
;
5098 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5099 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
5100 Gen_Comp
: constant Entity_Id
:=
5101 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
5103 Scope_Stack_Depth
: constant Pos
:=
5104 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
5106 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5107 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5108 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
5110 Curr_Scope
: Entity_Id
:= Empty
;
5111 List
: Elist_Id
:= No_Elist
; -- init to avoid warning
5112 N_Instances
: Nat
:= 0;
5113 Num_Inner
: Nat
:= 0;
5114 Num_Scopes
: Nat
:= 0;
5115 Removed
: Boolean := False;
5120 -- Case of generic unit defined in another unit. We must remove the
5121 -- complete context of the current unit to install that of the generic.
5123 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
5125 -- Loop through enclosing scopes until we reach a generic instance,
5126 -- package body, or subprogram.
5129 while Present
(S
) and then S
/= Standard_Standard
loop
5131 -- Save use clauses from enclosing scopes into Use_Clauses
5134 Num_Scopes
:= Num_Scopes
+ 1;
5136 Use_Clauses
(Num_Scopes
) :=
5138 (Scope_Stack
.Last
- Num_Scopes
+ 1).First_Use_Clause
);
5139 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
5141 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
5142 or else Scope_Stack
.Table
5143 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
5146 exit when Is_Generic_Instance
(S
)
5147 and then (In_Package_Body
(S
)
5148 or else Ekind
(S
) = E_Procedure
5149 or else Ekind
(S
) = E_Function
);
5153 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
5155 -- Find and save all enclosing instances
5160 and then S
/= Standard_Standard
5162 if Is_Generic_Instance
(S
) then
5163 N_Instances
:= N_Instances
+ 1;
5164 Instances
(N_Instances
) := S
;
5166 exit when In_Package_Body
(S
);
5172 -- Remove context of current compilation unit, unless we are within a
5173 -- nested package instantiation, in which case the context has been
5174 -- removed previously.
5176 -- If current scope is the body of a child unit, remove context of
5177 -- spec as well. If an enclosing scope is an instance body, the
5178 -- context has already been removed, but the entities in the body
5179 -- must be made invisible as well.
5182 while Present
(S
) and then S
/= Standard_Standard
loop
5183 if Is_Generic_Instance
(S
)
5184 and then (In_Package_Body
(S
)
5185 or else Ekind
(S
) in E_Procedure | E_Function
)
5187 -- We still have to remove the entities of the enclosing
5188 -- instance from direct visibility.
5193 E
:= First_Entity
(S
);
5194 while Present
(E
) loop
5195 Set_Is_Immediately_Visible
(E
, False);
5204 or else (Ekind
(Curr_Unit
) = E_Package_Body
5205 and then S
= Spec_Entity
(Curr_Unit
))
5206 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
5207 and then S
= Corresponding_Spec
5208 (Unit_Declaration_Node
(Curr_Unit
)))
5212 -- Remove entities in current scopes from visibility, so that
5213 -- instance body is compiled in a clean environment.
5215 List
:= Save_Scope_Stack
(Handle_Use
=> False);
5217 if Is_Child_Unit
(S
) then
5219 -- Remove child unit from stack, as well as inner scopes.
5220 -- Removing the context of a child unit removes parent units
5223 while Current_Scope
/= S
loop
5224 Num_Inner
:= Num_Inner
+ 1;
5225 Inner_Scopes
(Num_Inner
) := Current_Scope
;
5230 Remove_Context
(Curr_Comp
);
5234 Remove_Context
(Curr_Comp
);
5237 if Ekind
(Curr_Unit
) = E_Package_Body
then
5238 Remove_Context
(Library_Unit
(Curr_Comp
));
5245 pragma Assert
(Num_Inner
< Num_Scopes
);
5247 Push_Scope
(Standard_Standard
);
5248 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
5250 -- The inlined package body is analyzed with the configuration state
5251 -- of the context prior to the scope manipulations performed above.
5253 -- ??? shouldn't this also use the warning state of the context prior
5254 -- to the scope manipulations?
5256 Instantiate_Package_Body
5259 Act_Decl
=> Act_Decl
,
5261 Config_Switches
=> Config_Attrs
,
5262 Current_Sem_Unit
=> Current_Sem_Unit
,
5263 Expander_Status
=> Expander_Active
,
5264 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5265 Scope_Suppress
=> Scope_Suppress
,
5266 Warnings
=> Save_Warnings
)),
5267 Inlined_Body
=> True);
5273 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
5275 -- Reset Generic_Instance flag so that use clauses can be installed
5276 -- in the proper order. (See Use_One_Package for effect of enclosing
5277 -- instances on processing of use clauses).
5279 for J
in 1 .. N_Instances
loop
5280 Set_Is_Generic_Instance
(Instances
(J
), False);
5284 Install_Context
(Curr_Comp
, Chain
=> False);
5286 if Present
(Curr_Scope
)
5287 and then Is_Child_Unit
(Curr_Scope
)
5289 Push_Scope
(Curr_Scope
);
5290 Set_Is_Immediately_Visible
(Curr_Scope
);
5292 -- Finally, restore inner scopes as well
5294 for J
in reverse 1 .. Num_Inner
loop
5295 Push_Scope
(Inner_Scopes
(J
));
5299 Restore_Scope_Stack
(List
, Handle_Use
=> False);
5301 if Present
(Curr_Scope
)
5303 (In_Private_Part
(Curr_Scope
)
5304 or else In_Package_Body
(Curr_Scope
))
5306 -- Install private declaration of ancestor units, which are
5307 -- currently available. Restore_Scope_Stack and Install_Context
5308 -- only install the visible part of parents.
5313 Par
:= Scope
(Curr_Scope
);
5314 while Present
(Par
) and then Par
/= Standard_Standard
loop
5315 Install_Private_Declarations
(Par
);
5322 -- Restore use clauses. For a child unit, use clauses in the parents
5323 -- are restored when installing the context, so only those in inner
5324 -- scopes (and those local to the child unit itself) need to be
5325 -- installed explicitly.
5327 if Is_Child_Unit
(Curr_Unit
) and then Removed
then
5328 for J
in reverse 1 .. Num_Inner
+ 1 loop
5329 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5331 Install_Use_Clauses
(Use_Clauses
(J
));
5335 for J
in reverse 1 .. Num_Scopes
loop
5336 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5338 Install_Use_Clauses
(Use_Clauses
(J
));
5342 -- Restore status of instances. If one of them is a body, make its
5343 -- local entities visible again.
5350 for J
in 1 .. N_Instances
loop
5351 Inst
:= Instances
(J
);
5352 Set_Is_Generic_Instance
(Inst
, True);
5354 if In_Package_Body
(Inst
)
5355 or else Ekind
(S
) in E_Procedure | E_Function
5357 E
:= First_Entity
(Instances
(J
));
5358 while Present
(E
) loop
5359 Set_Is_Immediately_Visible
(E
);
5366 -- If generic unit is in current unit, current context is correct. Note
5367 -- that the context is guaranteed to carry the correct SPARK_Mode as no
5368 -- enclosing scopes were removed.
5371 Instantiate_Package_Body
5374 Act_Decl
=> Act_Decl
,
5376 Config_Switches
=> Save_Config_Switches
,
5377 Current_Sem_Unit
=> Current_Sem_Unit
,
5378 Expander_Status
=> Expander_Active
,
5379 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5380 Scope_Suppress
=> Scope_Suppress
,
5381 Warnings
=> Save_Warnings
)),
5382 Inlined_Body
=> True);
5384 end Inline_Instance_Body
;
5386 -------------------------------------
5387 -- Analyze_Procedure_Instantiation --
5388 -------------------------------------
5390 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
5392 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
5393 end Analyze_Procedure_Instantiation
;
5395 -----------------------------------
5396 -- Need_Subprogram_Instance_Body --
5397 -----------------------------------
5399 function Need_Subprogram_Instance_Body
5401 Subp
: Entity_Id
) return Boolean
5403 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean;
5404 -- Return True if E is an inlined subprogram, an inlined renaming or a
5405 -- subprogram nested in an inlined subprogram. The inlining machinery
5406 -- totally disregards nested subprograms since it considers that they
5407 -- will always be compiled if the parent is (see Inline.Is_Nested).
5409 ------------------------------------
5410 -- Is_Inlined_Or_Child_Of_Inlined --
5411 ------------------------------------
5413 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean is
5417 if Is_Inlined
(E
) or else Is_Inlined
(Alias
(E
)) then
5422 while Scop
/= Standard_Standard
loop
5423 if Is_Subprogram
(Scop
) and then Is_Inlined
(Scop
) then
5427 Scop
:= Scope
(Scop
);
5431 end Is_Inlined_Or_Child_Of_Inlined
;
5434 -- Must be in the main unit or inlined (or child of inlined)
5436 if (Is_In_Main_Unit
(N
) or else Is_Inlined_Or_Child_Of_Inlined
(Subp
))
5438 -- Must be generating code or analyzing code in GNATprove mode
5440 and then (Operating_Mode
= Generate_Code
5441 or else (Operating_Mode
= Check_Semantics
5442 and then GNATprove_Mode
))
5444 -- The body is needed when generating code (full expansion) and in
5445 -- in GNATprove mode (special expansion) for formal verification of
5448 and then (Expander_Active
or GNATprove_Mode
)
5450 -- No point in inlining if ABE is inevitable
5452 and then not Is_Known_Guaranteed_ABE
(N
)
5454 -- Or if subprogram is eliminated
5456 and then not Is_Eliminated
(Subp
)
5458 Add_Pending_Instantiation
(N
, Unit_Declaration_Node
(Subp
));
5461 -- Here if not inlined, or we ignore the inlining
5466 end Need_Subprogram_Instance_Body
;
5468 --------------------------------------
5469 -- Analyze_Subprogram_Instantiation --
5470 --------------------------------------
5472 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
5473 -- must be replaced by gotos which jump to the end of the routine in order
5474 -- to restore the Ghost and SPARK modes.
5476 procedure Analyze_Subprogram_Instantiation
5480 Errs
: constant Nat
:= Serious_Errors_Detected
;
5481 Gen_Id
: constant Node_Id
:= Name
(N
);
5482 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
5483 Anon_Id
: constant Entity_Id
:=
5484 Make_Defining_Identifier
(Sloc
(Inst_Id
),
5485 Chars
=> New_External_Name
(Chars
(Inst_Id
), 'R'));
5486 Loc
: constant Source_Ptr
:= Sloc
(N
);
5488 Act_Decl_Id
: Entity_Id
:= Empty
; -- init to avoid warning
5493 Env_Installed
: Boolean := False;
5494 Gen_Unit
: Entity_Id
;
5496 Pack_Id
: Entity_Id
;
5497 Parent_Installed
: Boolean := False;
5499 Renaming_List
: List_Id
;
5500 -- The list of declarations that link formals and actuals of the
5501 -- instance. These are subtype declarations for formal types, and
5502 -- renaming declarations for other formals. The subprogram declaration
5503 -- for the instance is then appended to the list, and the last item on
5504 -- the list is the renaming declaration for the instance.
5506 procedure Analyze_Instance_And_Renamings
;
5507 -- The instance must be analyzed in a context that includes the mappings
5508 -- of generic parameters into actuals. We create a package declaration
5509 -- for this purpose, and a subprogram with an internal name within the
5510 -- package. The subprogram instance is simply an alias for the internal
5511 -- subprogram, declared in the current scope.
5513 procedure Build_Subprogram_Renaming
;
5514 -- If the subprogram is recursive, there are occurrences of the name of
5515 -- the generic within the body, which must resolve to the current
5516 -- instance. We add a renaming declaration after the declaration, which
5517 -- is available in the instance body, as well as in the analysis of
5518 -- aspects that appear in the generic. This renaming declaration is
5519 -- inserted after the instance declaration which it renames.
5521 ------------------------------------
5522 -- Analyze_Instance_And_Renamings --
5523 ------------------------------------
5525 procedure Analyze_Instance_And_Renamings
is
5526 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
5527 Pack_Decl
: Node_Id
;
5530 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5532 -- For the case of a compilation unit, the container package has
5533 -- the same name as the instantiation, to insure that the binder
5534 -- calls the elaboration procedure with the right name. Copy the
5535 -- entity of the instance, which may have compilation level flags
5536 -- (e.g. Is_Child_Unit) set.
5538 Pack_Id
:= New_Copy
(Def_Ent
);
5541 -- Otherwise we use the name of the instantiation concatenated
5542 -- with its source position to ensure uniqueness if there are
5543 -- several instantiations with the same name.
5546 Make_Defining_Identifier
(Loc
,
5547 Chars
=> New_External_Name
5548 (Related_Id
=> Chars
(Def_Ent
),
5550 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
5554 Make_Package_Declaration
(Loc
,
5555 Specification
=> Make_Package_Specification
(Loc
,
5556 Defining_Unit_Name
=> Pack_Id
,
5557 Visible_Declarations
=> Renaming_List
,
5558 End_Label
=> Empty
));
5560 Set_Instance_Spec
(N
, Pack_Decl
);
5561 Set_Is_Generic_Instance
(Pack_Id
);
5562 Set_Debug_Info_Needed
(Pack_Id
);
5564 -- Case of not a compilation unit
5566 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5567 Mark_Rewrite_Insertion
(Pack_Decl
);
5568 Insert_Before
(N
, Pack_Decl
);
5569 Set_Has_Completion
(Pack_Id
);
5571 -- Case of an instantiation that is a compilation unit
5573 -- Place declaration on current node so context is complete for
5574 -- analysis (including nested instantiations), and for use in a
5575 -- context_clause (see Analyze_With_Clause).
5578 Set_Unit
(Parent
(N
), Pack_Decl
);
5579 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
5582 Analyze
(Pack_Decl
);
5583 Check_Formal_Packages
(Pack_Id
);
5585 -- Body of the enclosing package is supplied when instantiating the
5586 -- subprogram body, after semantic analysis is completed.
5588 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5590 -- Remove package itself from visibility, so it does not
5591 -- conflict with subprogram.
5593 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
5595 -- Set name and scope of internal subprogram so that the proper
5596 -- external name will be generated. The proper scope is the scope
5597 -- of the wrapper package. We need to generate debugging info for
5598 -- the internal subprogram, so set flag accordingly.
5600 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
5601 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
5603 -- Mark wrapper package as referenced, to avoid spurious warnings
5604 -- if the instantiation appears in various with_ clauses of
5605 -- subunits of the main unit.
5607 Set_Referenced
(Pack_Id
);
5610 Set_Is_Generic_Instance
(Anon_Id
);
5611 Set_Debug_Info_Needed
(Anon_Id
);
5612 Act_Decl_Id
:= New_Copy
(Anon_Id
);
5614 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5615 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5616 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5618 -- Subprogram instance comes from source only if generic does
5620 Preserve_Comes_From_Source
(Act_Decl_Id
, Gen_Unit
);
5622 -- If the instance is a child unit, mark the Id accordingly. Mark
5623 -- the anonymous entity as well, which is the real subprogram and
5624 -- which is used when the instance appears in a context clause.
5625 -- Similarly, propagate the Is_Eliminated flag to handle properly
5626 -- nested eliminated subprograms.
5628 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5629 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5630 New_Overloaded_Entity
(Act_Decl_Id
);
5631 Check_Eliminated
(Act_Decl_Id
);
5632 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5634 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5636 -- In compilation unit case, kill elaboration checks on the
5637 -- instantiation, since they are never needed - the body is
5638 -- instantiated at the same point as the spec.
5640 if Legacy_Elaboration_Checks
then
5641 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5642 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5645 Set_Is_Compilation_Unit
(Anon_Id
);
5646 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5649 -- The instance is not a freezing point for the new subprogram.
5650 -- The anonymous subprogram may have a freeze node, created for
5651 -- some delayed aspects. This freeze node must not be inherited
5652 -- by the visible subprogram entity.
5654 Set_Is_Frozen
(Act_Decl_Id
, False);
5655 Set_Freeze_Node
(Act_Decl_Id
, Empty
);
5657 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5658 Valid_Operator_Definition
(Act_Decl_Id
);
5661 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5662 Set_Has_Completion
(Act_Decl_Id
);
5663 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5665 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5666 Set_Body_Required
(Parent
(N
), False);
5668 end Analyze_Instance_And_Renamings
;
5670 -------------------------------
5671 -- Build_Subprogram_Renaming --
5672 -------------------------------
5674 procedure Build_Subprogram_Renaming
is
5675 Renaming_Decl
: Node_Id
;
5676 Unit_Renaming
: Node_Id
;
5680 Make_Subprogram_Renaming_Declaration
(Loc
,
5683 (Specification
(Original_Node
(Gen_Decl
)),
5685 Instantiating
=> True),
5686 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
5688 -- The generic may be a child unit. The renaming needs an identifier
5689 -- with the proper name.
5691 Set_Defining_Unit_Name
(Specification
(Unit_Renaming
),
5692 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)));
5694 -- If there is a formal subprogram with the same name as the unit
5695 -- itself, do not add this renaming declaration, to prevent
5696 -- ambiguities when there is a call with that name in the body.
5698 Renaming_Decl
:= First
(Renaming_List
);
5699 while Present
(Renaming_Decl
) loop
5700 if Nkind
(Renaming_Decl
) = N_Subprogram_Renaming_Declaration
5702 Chars
(Defining_Entity
(Renaming_Decl
)) = Chars
(Gen_Unit
)
5707 Next
(Renaming_Decl
);
5710 if No
(Renaming_Decl
) then
5711 Append
(Unit_Renaming
, Renaming_List
);
5713 end Build_Subprogram_Renaming
;
5717 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5718 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
5719 Saved_ISMP
: constant Boolean :=
5720 Ignore_SPARK_Mode_Pragmas_In_Instance
;
5721 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5722 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5723 -- Save the Ghost and SPARK mode-related data to restore on exit
5725 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5726 -- List of primitives made temporarily visible in the instantiation
5727 -- to match the visibility of the formal type
5729 -- Start of processing for Analyze_Subprogram_Instantiation
5732 -- Preserve relevant elaboration-related attributes of the context which
5733 -- are no longer available or very expensive to recompute once analysis,
5734 -- resolution, and expansion are over.
5736 Mark_Elaboration_Attributes
5743 -- Very first thing: check for special Text_IO unit in case we are
5744 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5745 -- such an instantiation is bogus (these are packages, not subprograms),
5746 -- but we get a better error message if we do this.
5748 Check_Text_IO_Special_Unit
(Gen_Id
);
5750 -- Make node global for error reporting
5752 Instantiation_Node
:= N
;
5754 -- For package instantiations we turn off style checks, because they
5755 -- will have been emitted in the generic. For subprogram instantiations
5756 -- we want to apply at least the check on overriding indicators so we
5757 -- do not modify the style check status.
5759 -- The renaming declarations for the actuals do not come from source and
5760 -- will not generate spurious warnings.
5762 Preanalyze_Actuals
(N
);
5765 Env_Installed
:= True;
5766 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5767 Gen_Unit
:= Entity
(Gen_Id
);
5769 -- A subprogram instantiation is Ghost when it is subject to pragma
5770 -- Ghost or the generic template is Ghost. Set the mode now to ensure
5771 -- that any nodes generated during analysis and expansion are marked as
5774 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
5776 Generate_Reference
(Gen_Unit
, Gen_Id
);
5778 if Nkind
(Gen_Id
) = N_Identifier
5779 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5782 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5785 if Etype
(Gen_Unit
) = Any_Type
then
5790 -- Verify that it is a generic subprogram of the right kind, and that
5791 -- it does not lead to a circular instantiation.
5793 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5795 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5797 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5799 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5801 elsif In_Open_Scopes
(Gen_Unit
) then
5802 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5805 Mutate_Ekind
(Inst_Id
, K
);
5806 Set_Scope
(Inst_Id
, Current_Scope
);
5808 Set_Entity
(Gen_Id
, Gen_Unit
);
5810 if In_Extended_Main_Source_Unit
(N
) then
5811 Set_Is_Instantiated
(Gen_Unit
);
5812 Generate_Reference
(Gen_Unit
, N
);
5815 -- If renaming, get original unit
5817 if Present
(Renamed_Entity
(Gen_Unit
))
5818 and then Is_Generic_Subprogram
(Renamed_Entity
(Gen_Unit
))
5820 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
5821 Set_Is_Instantiated
(Gen_Unit
);
5822 Generate_Reference
(Gen_Unit
, N
);
5825 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5826 Error_Msg_Node_2
:= Current_Scope
;
5828 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
5829 Circularity_Detected
:= True;
5830 Restore_Hidden_Primitives
(Vis_Prims_List
);
5834 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5836 -- Initialize renamings map, for error checking
5838 Generic_Renamings
.Set_Last
(0);
5839 Generic_Renamings_HTable
.Reset
;
5841 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
5843 -- Copy original generic tree, to produce text for instantiation
5847 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5849 -- Inherit overriding indicator from instance node
5851 Act_Spec
:= Specification
(Act_Tree
);
5852 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5853 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5856 Analyze_Associations
5858 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5859 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5861 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5863 -- The subprogram itself cannot contain a nested instance, so the
5864 -- current parent is left empty.
5866 Set_Instance_Env
(Gen_Unit
, Empty
);
5868 -- Build the subprogram declaration, which does not appear in the
5869 -- generic template, and give it a sloc consistent with that of the
5872 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5873 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5875 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5876 Specification
=> Act_Spec
);
5878 -- The aspects have been copied previously, but they have to be
5879 -- linked explicitly to the new subprogram declaration. Explicit
5880 -- pre/postconditions on the instance are analyzed below, in a
5883 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5884 Set_Categorization_From_Pragmas
(Act_Decl
);
5886 if Parent_Installed
then
5890 Append
(Act_Decl
, Renaming_List
);
5892 -- Contract-related source pragmas that follow a generic subprogram
5893 -- must be instantiated explicitly because they are not part of the
5894 -- subprogram template.
5896 Instantiate_Subprogram_Contract
5897 (Original_Node
(Gen_Decl
), Renaming_List
);
5899 Build_Subprogram_Renaming
;
5901 -- If the context of the instance is subject to SPARK_Mode "off" or
5902 -- the annotation is altogether missing, set the global flag which
5903 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5904 -- the instance. This should be done prior to analyzing the instance.
5906 if SPARK_Mode
/= On
then
5907 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
5910 -- If the context of an instance is not subject to SPARK_Mode "off",
5911 -- and the generic spec is subject to an explicit SPARK_Mode pragma,
5912 -- the latter should be the one applicable to the instance.
5914 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5915 and then Saved_SM
/= Off
5916 and then Present
(SPARK_Pragma
(Gen_Unit
))
5918 Set_SPARK_Mode
(Gen_Unit
);
5921 -- Need to mark Anon_Id intrinsic before calling
5922 -- Analyze_Instance_And_Renamings because this flag may be propagated
5925 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5926 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5927 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
5930 Analyze_Instance_And_Renamings
;
5932 -- Restore SPARK_Mode from the context after analysis of the package
5933 -- declaration, so that the SPARK_Mode on the generic spec does not
5934 -- apply to the pending instance for the instance body.
5936 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5937 and then Saved_SM
/= Off
5938 and then Present
(SPARK_Pragma
(Gen_Unit
))
5940 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5943 -- If the generic is marked Import (Intrinsic), then so is the
5944 -- instance; this indicates that there is no body to instantiate.
5945 -- We also copy the interface name in case this is handled by the
5946 -- back-end and deal with an instance of unchecked conversion.
5948 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5949 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5950 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
5952 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5953 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5957 -- Inherit convention from generic unit. Intrinsic convention, as for
5958 -- an instance of unchecked conversion, is not inherited because an
5959 -- explicit Ada instance has been created.
5961 if Has_Convention_Pragma
(Gen_Unit
)
5962 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5964 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5965 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5968 Generate_Definition
(Act_Decl_Id
);
5970 -- Inherit all inlining-related flags which apply to the generic in
5971 -- the subprogram and its declaration.
5973 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5974 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5976 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5977 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5979 Set_Has_Pragma_Inline_Always
5980 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5981 Set_Has_Pragma_Inline_Always
5982 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5984 Set_Has_Pragma_No_Inline
5985 (Act_Decl_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5986 Set_Has_Pragma_No_Inline
5987 (Anon_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5989 -- Propagate No_Return if pragma applied to generic unit. This must
5990 -- be done explicitly because pragma does not appear in generic
5991 -- declaration (unlike the aspect case).
5993 if No_Return
(Gen_Unit
) then
5994 Set_No_Return
(Act_Decl_Id
);
5995 Set_No_Return
(Anon_Id
);
5998 -- Mark both the instance spec and the anonymous package in case the
5999 -- body is instantiated at a later pass. This preserves the original
6000 -- context in effect for the body.
6002 if SPARK_Mode
/= On
then
6003 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
6004 Set_Ignore_SPARK_Mode_Pragmas
(Anon_Id
);
6007 if Legacy_Elaboration_Checks
6008 and then not Is_Intrinsic_Subprogram
(Gen_Unit
)
6010 Check_Elab_Instantiation
(N
);
6013 -- Save the scenario for later examination by the ABE Processing
6016 Record_Elaboration_Scenario
(N
);
6018 -- The instantiation results in a guaranteed ABE. Create a completing
6019 -- body for the subprogram declaration because the real body will not
6022 if Is_Known_Guaranteed_ABE
(N
) then
6023 Provide_Completing_Bodies
(Instance_Spec
(N
));
6026 if Is_Dispatching_Operation
(Act_Decl_Id
)
6027 and then Ada_Version
>= Ada_2005
6033 Formal
:= First_Formal
(Act_Decl_Id
);
6034 while Present
(Formal
) loop
6035 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
6036 and then Is_Controlling_Formal
(Formal
)
6037 and then not Can_Never_Be_Null
(Formal
)
6040 ("access parameter& is controlling,", N
, Formal
);
6042 ("\corresponding parameter of & must be explicitly "
6043 & "null-excluding", N
, Gen_Id
);
6046 Next_Formal
(Formal
);
6051 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
6053 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
6055 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
6056 Inherit_Context
(Gen_Decl
, N
);
6058 Restore_Private_Views
(Pack_Id
, False);
6060 -- If the context requires a full instantiation, mark node for
6061 -- subsequent construction of the body.
6063 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
6064 Check_Forward_Instantiation
(Gen_Decl
);
6066 -- The wrapper package is always delayed, because it does not
6067 -- constitute a freeze point, but to insure that the freeze node
6068 -- is placed properly, it is created directly when instantiating
6069 -- the body (otherwise the freeze node might appear to early for
6070 -- nested instantiations).
6072 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
6073 Rewrite
(N
, Unit
(Parent
(N
)));
6074 Set_Unit
(Parent
(N
), N
);
6077 -- Replace instance node for library-level instantiations of
6078 -- intrinsic subprograms.
6080 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
6081 Rewrite
(N
, Unit
(Parent
(N
)));
6082 Set_Unit
(Parent
(N
), N
);
6085 if Parent_Installed
then
6089 Restore_Hidden_Primitives
(Vis_Prims_List
);
6091 Env_Installed
:= False;
6092 Generic_Renamings
.Set_Last
(0);
6093 Generic_Renamings_HTable
.Reset
;
6097 -- Analyze aspects in declaration if no errors appear in the instance.
6099 if Has_Aspects
(N
) and then Serious_Errors_Detected
= Errs
then
6100 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
6103 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6104 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6105 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6108 when Instantiation_Error
=>
6109 if Parent_Installed
then
6113 if Env_Installed
then
6117 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6118 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6119 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6120 end Analyze_Subprogram_Instantiation
;
6122 -------------------------
6123 -- Get_Associated_Node --
6124 -------------------------
6126 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
6130 Assoc
:= Associated_Node
(N
);
6132 if Nkind
(Assoc
) /= Nkind
(N
) then
6135 elsif Nkind
(Assoc
) in N_Aggregate | N_Extension_Aggregate
then
6139 -- If the node is part of an inner generic, it may itself have been
6140 -- remapped into a further generic copy. Associated_Node is otherwise
6141 -- used for the entity of the node, and will be of a different node
6142 -- kind, or else N has been rewritten as a literal or function call.
6144 while Present
(Associated_Node
(Assoc
))
6145 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
6147 Assoc
:= Associated_Node
(Assoc
);
6150 -- Follow an additional link in case the final node was rewritten.
6151 -- This can only happen with nested generic units.
6153 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
6154 and then Present
(Associated_Node
(Assoc
))
6155 and then Nkind
(Associated_Node
(Assoc
)) in N_Function_Call
6156 | N_Explicit_Dereference
6161 Assoc
:= Associated_Node
(Assoc
);
6164 -- An additional special case: an unconstrained type in an object
6165 -- declaration may have been rewritten as a local subtype constrained
6166 -- by the expression in the declaration. We need to recover the
6167 -- original entity, which may be global.
6169 if Present
(Original_Node
(Assoc
))
6170 and then Nkind
(Parent
(N
)) = N_Object_Declaration
6172 Assoc
:= Original_Node
(Assoc
);
6177 end Get_Associated_Node
;
6179 -----------------------------------
6180 -- Build_Subprogram_Decl_Wrapper --
6181 -----------------------------------
6183 function Build_Subprogram_Decl_Wrapper
6184 (Formal_Subp
: Entity_Id
) return Node_Id
6186 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6187 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6190 Parm_Spec
: Node_Id
;
6191 Profile
: List_Id
:= New_List
;
6198 Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
6199 Mutate_Ekind
(Subp
, Ekind
(Formal_Subp
));
6200 Set_Is_Generic_Actual_Subprogram
(Subp
);
6202 Profile
:= Parameter_Specifications
(
6204 (Specification
(Unit_Declaration_Node
(Formal_Subp
))));
6206 Form_F
:= First_Formal
(Formal_Subp
);
6207 Parm_Spec
:= First
(Profile
);
6209 -- Create new entities for the formals. Reset entities so that
6210 -- parameter types are properly resolved when wrapper declaration
6213 while Present
(Parm_Spec
) loop
6214 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
6215 Set_Defining_Identifier
(Parm_Spec
, New_F
);
6216 Set_Entity
(Parameter_Type
(Parm_Spec
), Empty
);
6218 Next_Formal
(Form_F
);
6221 if Ret_Type
= Standard_Void_Type
then
6223 Make_Procedure_Specification
(Loc
,
6224 Defining_Unit_Name
=> Subp
,
6225 Parameter_Specifications
=> Profile
);
6228 Make_Function_Specification
(Loc
,
6229 Defining_Unit_Name
=> Subp
,
6230 Parameter_Specifications
=> Profile
,
6231 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6235 Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
);
6238 end Build_Subprogram_Decl_Wrapper
;
6240 -----------------------------------
6241 -- Build_Subprogram_Body_Wrapper --
6242 -----------------------------------
6244 function Build_Subprogram_Body_Wrapper
6245 (Formal_Subp
: Entity_Id
;
6246 Actual_Name
: Node_Id
) return Node_Id
6248 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6249 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6250 Spec_Node
: constant Node_Id
:=
6252 (Build_Subprogram_Decl_Wrapper
(Formal_Subp
));
6255 Body_Node
: Node_Id
;
6258 Actuals
:= New_List
;
6259 Act
:= First
(Parameter_Specifications
(Spec_Node
));
6261 while Present
(Act
) loop
6263 Make_Identifier
(Loc
, Chars
(Defining_Identifier
(Act
))));
6267 if Ret_Type
= Standard_Void_Type
then
6268 Stmt
:= Make_Procedure_Call_Statement
(Loc
,
6269 Name
=> Actual_Name
,
6270 Parameter_Associations
=> Actuals
);
6273 Stmt
:= Make_Simple_Return_Statement
(Loc
,
6275 Make_Function_Call
(Loc
,
6276 Name
=> Actual_Name
,
6277 Parameter_Associations
=> Actuals
));
6280 Body_Node
:= Make_Subprogram_Body
(Loc
,
6281 Specification
=> Spec_Node
,
6282 Declarations
=> New_List
,
6283 Handled_Statement_Sequence
=>
6284 Make_Handled_Sequence_Of_Statements
(Loc
,
6285 Statements
=> New_List
(Stmt
)));
6288 end Build_Subprogram_Body_Wrapper
;
6290 -------------------------------------------
6291 -- Build_Instance_Compilation_Unit_Nodes --
6292 -------------------------------------------
6294 procedure Build_Instance_Compilation_Unit_Nodes
6299 Decl_Cunit
: Node_Id
;
6300 Body_Cunit
: Node_Id
;
6302 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
6303 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
6306 -- A new compilation unit node is built for the instance declaration.
6307 -- It relocates the auxiliary declaration node from the compilation unit
6308 -- where the instance appeared, so that declarations that originally
6309 -- followed the instance will be attached to the spec compilation unit.
6312 Make_Compilation_Unit
(Sloc
(N
),
6313 Context_Items
=> Empty_List
,
6315 Aux_Decls_Node
=> Relocate_Node
(Aux_Decls_Node
(Parent
(N
))));
6317 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
6319 -- The new compilation unit is linked to its body, but both share the
6320 -- same file, so we do not set Body_Required on the new unit so as not
6321 -- to create a spurious dependency on a non-existent body in the ali.
6322 -- This simplifies CodePeer unit traversal.
6324 -- We use the original instantiation compilation unit as the resulting
6325 -- compilation unit of the instance, since this is the main unit.
6327 Rewrite
(N
, Act_Body
);
6329 -- Propagate the aspect specifications from the package body template to
6330 -- the instantiated version of the package body.
6332 if Has_Aspects
(Act_Body
) then
6333 Set_Aspect_Specifications
6334 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
6337 Body_Cunit
:= Parent
(N
);
6339 -- The two compilation unit nodes are linked by the Library_Unit field
6341 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
6342 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
6344 -- Preserve the private nature of the package if needed
6346 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
6348 -- If the instance is not the main unit, its context, categorization
6349 -- and elaboration entity are not relevant to the compilation.
6351 if Body_Cunit
/= Cunit
(Main_Unit
) then
6352 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
6356 -- The context clause items on the instantiation, which are now attached
6357 -- to the body compilation unit (since the body overwrote the original
6358 -- instantiation node), semantically belong on the spec, so copy them
6359 -- there. It's harmless to leave them on the body as well. In fact one
6360 -- could argue that they belong in both places.
6362 Citem
:= First
(Context_Items
(Body_Cunit
));
6363 while Present
(Citem
) loop
6364 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
6368 -- Propagate categorization flags on packages, so that they appear in
6369 -- the ali file for the spec of the unit.
6371 if Ekind
(New_Main
) = E_Package
then
6372 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
6373 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
6374 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
6375 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
6376 Set_Is_Remote_Call_Interface
6377 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
6380 -- Make entry in Units table, so that binder can generate call to
6381 -- elaboration procedure for body, if any.
6383 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
6384 Main_Unit_Entity
:= New_Main
;
6385 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
6387 -- Build elaboration entity, since the instance may certainly generate
6388 -- elaboration code requiring a flag for protection.
6390 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
6391 end Build_Instance_Compilation_Unit_Nodes
;
6393 --------------------------------
6394 -- Check_Abbreviated_Instance --
6395 --------------------------------
6397 procedure Check_Abbreviated_Instance
6399 Parent_Installed
: in out Boolean)
6401 Inst_Node
: Node_Id
;
6404 if Nkind
(N
) = N_Package_Specification
6405 and then Is_Abbreviated_Instance
(Defining_Entity
(N
))
6407 Inst_Node
:= Get_Unit_Instantiation_Node
(Defining_Entity
(N
));
6408 Check_Generic_Child_Unit
(Name
(Inst_Node
), Parent_Installed
);
6410 end Check_Abbreviated_Instance
;
6412 -----------------------------
6413 -- Check_Access_Definition --
6414 -----------------------------
6416 procedure Check_Access_Definition
(N
: Node_Id
) is
6419 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
6421 end Check_Access_Definition
;
6423 -----------------------------------
6424 -- Check_Formal_Package_Instance --
6425 -----------------------------------
6427 -- If the formal has specific parameters, they must match those of the
6428 -- actual. Both of them are instances, and the renaming declarations for
6429 -- their formal parameters appear in the same order in both. The analyzed
6430 -- formal has been analyzed in the context of the current instance.
6432 procedure Check_Formal_Package_Instance
6433 (Formal_Pack
: Entity_Id
;
6434 Actual_Pack
: Entity_Id
)
6436 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
6437 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
6438 Prev_E1
: Entity_Id
;
6443 procedure Check_Mismatch
(B
: Boolean);
6444 -- Common error routine for mismatch between the parameters of the
6445 -- actual instance and those of the formal package.
6447 function Is_Defaulted
(Param
: Entity_Id
) return Boolean;
6448 -- If the formal package has partly box-initialized formals, skip
6449 -- conformance check for these formals. Previously the code assumed
6450 -- that box initialization for a formal package applied to all its
6451 -- formal parameters.
6453 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
6454 -- The formal may come from a nested formal package, and the actual may
6455 -- have been constant-folded. To determine whether the two denote the
6456 -- same entity we may have to traverse several definitions to recover
6457 -- the ultimate entity that they refer to.
6459 function Same_Instantiated_Function
(E1
, E2
: Entity_Id
) return Boolean;
6460 -- The formal and the actual must be identical, but if both are
6461 -- given by attributes they end up renaming different generated bodies,
6462 -- and we must verify that the attributes themselves match.
6464 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
6465 -- Similarly, if the formal comes from a nested formal package, the
6466 -- actual may designate the formal through multiple renamings, which
6467 -- have to be followed to determine the original variable in question.
6469 --------------------
6470 -- Check_Mismatch --
6471 --------------------
6473 procedure Check_Mismatch
(B
: Boolean) is
6474 -- A Formal_Type_Declaration for a derived private type is rewritten
6475 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
6476 -- which is why we examine the original node.
6478 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(Parent
(E2
)));
6481 if Kind
= N_Formal_Type_Declaration
then
6484 elsif Kind
in N_Formal_Object_Declaration
6485 | N_Formal_Package_Declaration
6486 | N_Formal_Subprogram_Declaration
6490 -- Ada 2012: If both formal and actual are incomplete types they
6493 elsif Is_Incomplete_Type
(E1
) and then Is_Incomplete_Type
(E2
) then
6498 ("actual for & in actual instance does not match formal",
6499 Parent
(Actual_Pack
), E1
);
6507 function Is_Defaulted
(Param
: Entity_Id
) return Boolean is
6512 First
(Generic_Associations
(Parent
6513 (Associated_Formal_Package
(Actual_Pack
))));
6515 while Present
(Assoc
) loop
6516 if Nkind
(Assoc
) = N_Others_Choice
then
6519 elsif Nkind
(Assoc
) = N_Generic_Association
6520 and then Chars
(Selector_Name
(Assoc
)) = Chars
(Param
)
6522 return Box_Present
(Assoc
);
6531 --------------------------------
6532 -- Same_Instantiated_Constant --
6533 --------------------------------
6535 function Same_Instantiated_Constant
6536 (E1
, E2
: Entity_Id
) return Boolean
6542 while Present
(Ent
) loop
6546 elsif Ekind
(Ent
) /= E_Constant
then
6549 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
6550 if Entity
(Constant_Value
(Ent
)) = E1
then
6553 Ent
:= Entity
(Constant_Value
(Ent
));
6556 -- The actual may be a constant that has been folded. Recover
6559 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
6560 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
6568 end Same_Instantiated_Constant
;
6570 --------------------------------
6571 -- Same_Instantiated_Function --
6572 --------------------------------
6574 function Same_Instantiated_Function
6575 (E1
, E2
: Entity_Id
) return Boolean
6579 if Alias
(E1
) = Alias
(E2
) then
6582 elsif Present
(Alias
(E2
)) then
6583 U1
:= Original_Node
(Unit_Declaration_Node
(E1
));
6584 U2
:= Original_Node
(Unit_Declaration_Node
(Alias
(E2
)));
6586 return Nkind
(U1
) = N_Subprogram_Renaming_Declaration
6587 and then Nkind
(Name
(U1
)) = N_Attribute_Reference
6589 and then Nkind
(U2
) = N_Subprogram_Renaming_Declaration
6590 and then Nkind
(Name
(U2
)) = N_Attribute_Reference
6593 Attribute_Name
(Name
(U1
)) = Attribute_Name
(Name
(U2
));
6597 end Same_Instantiated_Function
;
6599 --------------------------------
6600 -- Same_Instantiated_Variable --
6601 --------------------------------
6603 function Same_Instantiated_Variable
6604 (E1
, E2
: Entity_Id
) return Boolean
6606 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
6607 -- Follow chain of renamings to the ultimate ancestor
6609 ---------------------
6610 -- Original_Entity --
6611 ---------------------
6613 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
6618 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
6619 and then Present
(Renamed_Object
(Orig
))
6620 and then Is_Entity_Name
(Renamed_Object
(Orig
))
6622 Orig
:= Entity
(Renamed_Object
(Orig
));
6626 end Original_Entity
;
6628 -- Start of processing for Same_Instantiated_Variable
6631 return Ekind
(E1
) = Ekind
(E2
)
6632 and then Original_Entity
(E1
) = Original_Entity
(E2
);
6633 end Same_Instantiated_Variable
;
6635 -- Start of processing for Check_Formal_Package_Instance
6639 while Present
(E1
) and then Present
(E2
) loop
6640 exit when Ekind
(E1
) = E_Package
6641 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
6643 -- If the formal is the renaming of the formal package, this
6644 -- is the end of its formal part, which may occur before the
6645 -- end of the formal part in the actual in the presence of
6646 -- defaulted parameters in the formal package.
6648 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
6649 and then Renamed_Entity
(E2
) = Scope
(E2
);
6651 -- The analysis of the actual may generate additional internal
6652 -- entities. If the formal is defaulted, there is no corresponding
6653 -- analysis and the internal entities must be skipped, until we
6654 -- find corresponding entities again.
6656 if Comes_From_Source
(E2
)
6657 and then not Comes_From_Source
(E1
)
6658 and then Chars
(E1
) /= Chars
(E2
)
6660 while Present
(E1
) and then Chars
(E1
) /= Chars
(E2
) loop
6668 -- Entities may be declared without full declaration, such as
6669 -- itypes and predefined operators (concatenation for arrays, eg).
6670 -- Skip it and keep the formal entity to find a later match for it.
6672 elsif No
(Parent
(E2
)) and then Ekind
(E1
) /= Ekind
(E2
) then
6676 -- If the formal entity comes from a formal declaration, it was
6677 -- defaulted in the formal package, and no check is needed on it.
6679 elsif Nkind
(Original_Node
(Parent
(E2
))) in
6680 N_Formal_Object_Declaration | N_Formal_Type_Declaration
6682 -- If the formal is a tagged type the corresponding class-wide
6683 -- type has been generated as well, and it must be skipped.
6685 if Is_Type
(E2
) and then Is_Tagged_Type
(E2
) then
6691 -- Ditto for defaulted formal subprograms.
6693 elsif Is_Overloadable
(E1
)
6694 and then Nkind
(Unit_Declaration_Node
(E2
)) in
6695 N_Formal_Subprogram_Declaration
6699 elsif Is_Defaulted
(E1
) then
6702 elsif Is_Type
(E1
) then
6704 -- Subtypes must statically match. E1, E2 are the local entities
6705 -- that are subtypes of the actuals. Itypes generated for other
6706 -- parameters need not be checked, the check will be performed
6707 -- on the parameters themselves.
6709 -- If E2 is a formal type declaration, it is a defaulted parameter
6710 -- and needs no checking.
6712 if not Is_Itype
(E1
) and then not Is_Itype
(E2
) then
6715 or else Etype
(E1
) /= Etype
(E2
)
6716 or else not Subtypes_Statically_Match
(E1
, E2
));
6719 elsif Ekind
(E1
) = E_Constant
then
6721 -- IN parameters must denote the same static value, or the same
6722 -- constant, or the literal null.
6724 Expr1
:= Expression
(Parent
(E1
));
6726 if Ekind
(E2
) /= E_Constant
then
6727 Check_Mismatch
(True);
6730 Expr2
:= Expression
(Parent
(E2
));
6733 if Is_OK_Static_Expression
(Expr1
) then
6734 if not Is_OK_Static_Expression
(Expr2
) then
6735 Check_Mismatch
(True);
6737 elsif Is_Discrete_Type
(Etype
(E1
)) then
6739 V1
: constant Uint
:= Expr_Value
(Expr1
);
6740 V2
: constant Uint
:= Expr_Value
(Expr2
);
6742 Check_Mismatch
(V1
/= V2
);
6745 elsif Is_Real_Type
(Etype
(E1
)) then
6747 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
6748 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
6750 Check_Mismatch
(V1
/= V2
);
6753 elsif Is_String_Type
(Etype
(E1
))
6754 and then Nkind
(Expr1
) = N_String_Literal
6756 if Nkind
(Expr2
) /= N_String_Literal
then
6757 Check_Mismatch
(True);
6760 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
6764 elsif Is_Entity_Name
(Expr1
) then
6765 if Is_Entity_Name
(Expr2
) then
6766 if Entity
(Expr1
) = Entity
(Expr2
) then
6770 (not Same_Instantiated_Constant
6771 (Entity
(Expr1
), Entity
(Expr2
)));
6775 Check_Mismatch
(True);
6778 elsif Is_Entity_Name
(Original_Node
(Expr1
))
6779 and then Is_Entity_Name
(Expr2
)
6780 and then Same_Instantiated_Constant
6781 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
6785 elsif Nkind
(Expr1
) = N_Null
then
6786 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
6789 Check_Mismatch
(True);
6792 elsif Ekind
(E1
) = E_Variable
then
6793 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
6795 elsif Ekind
(E1
) = E_Package
then
6797 (Ekind
(E1
) /= Ekind
(E2
)
6798 or else (Present
(Renamed_Entity
(E2
))
6799 and then Renamed_Entity
(E1
) /=
6800 Renamed_Entity
(E2
)));
6802 elsif Is_Overloadable
(E1
) then
6803 -- Verify that the actual subprograms match. Note that actuals
6804 -- that are attributes are rewritten as subprograms. If the
6805 -- subprogram in the formal package is defaulted, no check is
6806 -- needed. Note that this can only happen in Ada 2005 when the
6807 -- formal package can be partially parameterized.
6809 if Nkind
(Unit_Declaration_Node
(E1
)) =
6810 N_Subprogram_Renaming_Declaration
6811 and then From_Default
(Unit_Declaration_Node
(E1
))
6815 -- If the formal package has an "others" box association that
6816 -- covers this formal, there is no need for a check either.
6818 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
6819 N_Formal_Subprogram_Declaration
6820 and then Box_Present
(Unit_Declaration_Node
(E2
))
6824 -- No check needed if subprogram is a defaulted null procedure
6826 elsif No
(Alias
(E2
))
6827 and then Ekind
(E2
) = E_Procedure
6829 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
6833 -- Otherwise the actual in the formal and the actual in the
6834 -- instantiation of the formal must match, up to renamings.
6838 (Ekind
(E2
) /= Ekind
(E1
)
6839 or else not Same_Instantiated_Function
(E1
, E2
));
6843 raise Program_Error
;
6851 end Check_Formal_Package_Instance
;
6853 ---------------------------
6854 -- Check_Formal_Packages --
6855 ---------------------------
6857 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
6859 Formal_P
: Entity_Id
;
6860 Formal_Decl
: Node_Id
;
6863 -- Iterate through the declarations in the instance, looking for package
6864 -- renaming declarations that denote instances of formal packages, until
6865 -- we find the renaming of the current package itself. The declaration
6866 -- of a formal package that requires conformance checking is followed by
6867 -- an internal entity that is the abbreviated instance.
6869 E
:= First_Entity
(P_Id
);
6870 while Present
(E
) loop
6871 if Ekind
(E
) = E_Package
then
6872 exit when Renamed_Entity
(E
) = P_Id
;
6874 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
then
6875 Formal_Decl
:= Parent
(Associated_Formal_Package
(E
));
6877 if Requires_Conformance_Checking
(Formal_Decl
) then
6878 Formal_P
:= Next_Entity
(E
);
6880 -- If the instance is within an enclosing instance body
6881 -- there is no need to verify the legality of current formal
6882 -- packages because they were legal in the generic body.
6883 -- This optimization may be applicable elsewhere, and it
6884 -- also removes spurious errors that may arise with
6885 -- on-the-fly inlining and confusion between private and
6888 if not In_Instance_Body
then
6889 Check_Formal_Package_Instance
(Formal_P
, E
);
6892 -- Restore the visibility of formals of the formal instance
6893 -- that are not defaulted, and are hidden within the current
6894 -- generic. These formals may be visible within an enclosing
6900 Elmt
:= First_Elmt
(Hidden_In_Formal_Instance
(Formal_P
));
6901 while Present
(Elmt
) loop
6902 Set_Is_Hidden
(Node
(Elmt
), False);
6907 -- After checking, remove the internal validating package.
6908 -- It is only needed for semantic checks, and as it may
6909 -- contain generic formal declarations it should not reach
6912 Remove
(Unit_Declaration_Node
(Formal_P
));
6919 end Check_Formal_Packages
;
6921 ---------------------------------
6922 -- Check_Forward_Instantiation --
6923 ---------------------------------
6925 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
6927 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
6930 -- The instantiation appears before the generic body if we are in the
6931 -- scope of the unit containing the generic, either in its spec or in
6932 -- the package body, and before the generic body.
6934 if Ekind
(Gen_Comp
) = E_Package_Body
then
6935 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
6938 if In_Open_Scopes
(Gen_Comp
)
6939 and then No
(Corresponding_Body
(Decl
))
6944 and then not Is_Compilation_Unit
(S
)
6945 and then not Is_Child_Unit
(S
)
6947 if Ekind
(S
) = E_Package
then
6948 Set_Has_Forward_Instantiation
(S
);
6954 end Check_Forward_Instantiation
;
6956 ---------------------------
6957 -- Check_Generic_Actuals --
6958 ---------------------------
6960 -- The visibility of the actuals may be different between the point of
6961 -- generic instantiation and the instantiation of the body.
6963 procedure Check_Generic_Actuals
6964 (Instance
: Entity_Id
;
6965 Is_Formal_Box
: Boolean)
6967 Gen_Id
: constant Entity_Id
6968 := (if Is_Generic_Unit
(Instance
) then
6970 elsif Is_Wrapper_Package
(Instance
) then
6973 (Unit_Declaration_Node
(Related_Instance
(Instance
))))
6975 Generic_Parent
(Package_Specification
(Instance
)));
6978 Parent_Scope
: constant Entity_Id
:= Scope
(Gen_Id
);
6979 -- The enclosing scope of the generic unit
6981 procedure Check_Actual_Type
(Typ
: Entity_Id
);
6982 -- If the type of the actual is a private type declared in the
6983 -- enclosing scope of the generic unit, the body of the generic
6984 -- sees the full view of the type (because it has to appear in
6985 -- the corresponding package body). If the type is private now,
6986 -- exchange views to restore the proper visibility in the instance.
6988 -----------------------
6989 -- Check_Actual_Type --
6990 -----------------------
6992 procedure Check_Actual_Type
(Typ
: Entity_Id
) is
6993 Btyp
: constant Entity_Id
:= Base_Type
(Typ
);
6996 -- The exchange is only needed if the generic is defined
6997 -- within a package which is not a common ancestor of the
6998 -- scope of the instance, and is not already in scope.
7000 if Is_Private_Type
(Btyp
)
7001 and then Scope
(Btyp
) = Parent_Scope
7002 and then Ekind
(Parent_Scope
) in E_Package | E_Generic_Package
7003 and then Scope
(Instance
) /= Parent_Scope
7004 and then not Is_Child_Unit
(Gen_Id
)
7008 -- If the type of the entity is a subtype, it may also have
7009 -- to be made visible, together with the base type of its
7010 -- full view, after exchange.
7012 if Is_Private_Type
(Typ
) then
7014 Switch_View
(Base_Type
(Typ
));
7017 end Check_Actual_Type
;
7024 E
:= First_Entity
(Instance
);
7025 while Present
(E
) loop
7027 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
7028 and then Scope
(Etype
(E
)) /= Instance
7029 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
7031 -- Restore the proper view of the actual from the information
7032 -- saved earlier by Instantiate_Type.
7034 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
7036 -- If the actual is itself the formal of a parent instance,
7037 -- then also restore the proper view of its actual and so on.
7038 -- That's necessary for nested instantiations of the form
7041 -- type Component is private;
7042 -- type Array_Type is array (Positive range <>) of Component;
7045 -- when the outermost actuals have inconsistent views, because
7046 -- the Component_Type of Array_Type of the inner instantiations
7047 -- is the actual of Component of the outermost one and not that
7048 -- of the corresponding inner instantiations.
7050 Astype
:= Ancestor_Subtype
(E
);
7051 while Present
(Astype
)
7052 and then Nkind
(Parent
(Astype
)) = N_Subtype_Declaration
7053 and then Present
(Generic_Parent_Type
(Parent
(Astype
)))
7054 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Astype
)))
7056 Check_Private_View
(Subtype_Indication
(Parent
(Astype
)));
7057 Astype
:= Ancestor_Subtype
(Astype
);
7060 Set_Is_Generic_Actual_Type
(E
);
7062 if Is_Private_Type
(E
) and then Present
(Full_View
(E
)) then
7063 Set_Is_Generic_Actual_Type
(Full_View
(E
));
7066 Set_Is_Hidden
(E
, False);
7067 Set_Is_Potentially_Use_Visible
(E
, In_Use
(Instance
));
7069 -- We constructed the generic actual type as a subtype of the
7070 -- supplied type. This means that it normally would not inherit
7071 -- subtype specific attributes of the actual, which is wrong for
7072 -- the generic case.
7074 Astype
:= Ancestor_Subtype
(E
);
7078 -- This can happen when E is an itype that is the full view of
7079 -- a private type completed, e.g. with a constrained array. In
7080 -- that case, use the first subtype, which will carry size
7081 -- information. The base type itself is unconstrained and will
7084 Astype
:= First_Subtype
(E
);
7087 Set_Size_Info
(E
, Astype
);
7088 Copy_RM_Size
(To
=> E
, From
=> Astype
);
7089 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
7091 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
7092 Set_RM_Size
(E
, RM_Size
(Astype
));
7095 elsif Ekind
(E
) = E_Package
then
7097 -- If this is the renaming for the current instance, we're done.
7098 -- Otherwise it is a formal package. If the corresponding formal
7099 -- was declared with a box, the (instantiations of the) generic
7100 -- formal part are also visible. Otherwise, ignore the entity
7101 -- created to validate the actuals.
7103 if Renamed_Entity
(E
) = Instance
then
7106 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
7109 -- The visibility of a formal of an enclosing generic is already
7112 elsif Denotes_Formal_Package
(E
) then
7115 elsif Present
(Associated_Formal_Package
(E
))
7116 and then not Is_Generic_Formal
(E
)
7118 Check_Generic_Actuals
7119 (Renamed_Entity
(E
),
7121 Box_Present
(Parent
(Associated_Formal_Package
(E
))));
7123 Set_Is_Hidden
(E
, False);
7126 -- If this is a subprogram instance (in a wrapper package) the
7127 -- actual is fully visible.
7129 elsif Is_Wrapper_Package
(Instance
) then
7130 Set_Is_Hidden
(E
, False);
7132 -- If the formal package is declared with a box, or if the formal
7133 -- parameter is defaulted, it is visible in the body.
7135 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
7136 Set_Is_Hidden
(E
, False);
7139 -- Check directly the type of the actual objects
7141 if Ekind
(E
) in E_Constant | E_Variable
then
7142 Check_Actual_Type
(Etype
(E
));
7144 -- As well as the type of formal parameters of actual subprograms
7146 elsif Ekind
(E
) in E_Function | E_Procedure
7147 and then Is_Generic_Actual_Subprogram
(E
)
7148 and then Present
(Alias
(E
))
7150 Formal
:= First_Formal
(Alias
(E
));
7151 while Present
(Formal
) loop
7152 Check_Actual_Type
(Etype
(Formal
));
7153 Next_Formal
(Formal
);
7159 end Check_Generic_Actuals
;
7161 ------------------------------
7162 -- Check_Generic_Child_Unit --
7163 ------------------------------
7165 procedure Check_Generic_Child_Unit
7167 Parent_Installed
: in out Boolean)
7169 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
7170 Gen_Par
: Entity_Id
:= Empty
;
7172 Inst_Par
: Entity_Id
;
7175 function Find_Generic_Child
7177 Id
: Node_Id
) return Entity_Id
;
7178 -- Search generic parent for possible child unit with the given name
7180 function In_Enclosing_Instance
return Boolean;
7181 -- Within an instance of the parent, the child unit may be denoted by
7182 -- a simple name, or an abbreviated expanded name. Examine enclosing
7183 -- scopes to locate a possible parent instantiation.
7185 ------------------------
7186 -- Find_Generic_Child --
7187 ------------------------
7189 function Find_Generic_Child
7191 Id
: Node_Id
) return Entity_Id
7196 -- If entity of name is already set, instance has already been
7197 -- resolved, e.g. in an enclosing instantiation.
7199 if Present
(Entity
(Id
)) then
7200 if Scope
(Entity
(Id
)) = Scop
then
7207 E
:= First_Entity
(Scop
);
7208 while Present
(E
) loop
7209 if Chars
(E
) = Chars
(Id
)
7210 and then Is_Child_Unit
(E
)
7212 if Is_Child_Unit
(E
)
7213 and then not Is_Visible_Lib_Unit
(E
)
7216 ("generic child unit& is not visible", Gen_Id
, E
);
7228 end Find_Generic_Child
;
7230 ---------------------------
7231 -- In_Enclosing_Instance --
7232 ---------------------------
7234 function In_Enclosing_Instance
return Boolean is
7235 Enclosing_Instance
: Node_Id
;
7236 Instance_Decl
: Node_Id
;
7239 -- We do not inline any call that contains instantiations, except
7240 -- for instantiations of Unchecked_Conversion, so if we are within
7241 -- an inlined body the current instance does not require parents.
7243 if In_Inlined_Body
then
7244 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
7248 -- Loop to check enclosing scopes
7250 Enclosing_Instance
:= Current_Scope
;
7251 while Present
(Enclosing_Instance
) loop
7252 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
7254 if Ekind
(Enclosing_Instance
) = E_Package
7255 and then Is_Generic_Instance
(Enclosing_Instance
)
7257 (Generic_Parent
(Specification
(Instance_Decl
)))
7259 -- Check whether the generic we are looking for is a child of
7262 E
:= Find_Generic_Child
7263 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
7264 exit when Present
(E
);
7270 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
7282 Make_Expanded_Name
(Loc
,
7284 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
7285 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
7287 Set_Entity
(Gen_Id
, E
);
7288 Set_Etype
(Gen_Id
, Etype
(E
));
7289 Parent_Installed
:= False; -- Already in scope.
7292 end In_Enclosing_Instance
;
7294 -- Start of processing for Check_Generic_Child_Unit
7297 -- If the name of the generic is given by a selected component, it may
7298 -- be the name of a generic child unit, and the prefix is the name of an
7299 -- instance of the parent, in which case the child unit must be visible.
7300 -- If this instance is not in scope, it must be placed there and removed
7301 -- after instantiation, because what is being instantiated is not the
7302 -- original child, but the corresponding child present in the instance
7305 -- If the child is instantiated within the parent, it can be given by
7306 -- a simple name. In this case the instance is already in scope, but
7307 -- the child generic must be recovered from the generic parent as well.
7309 if Nkind
(Gen_Id
) = N_Selected_Component
then
7310 S
:= Selector_Name
(Gen_Id
);
7311 Analyze
(Prefix
(Gen_Id
));
7312 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7314 if Ekind
(Inst_Par
) = E_Package
7315 and then Present
(Renamed_Entity
(Inst_Par
))
7317 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7320 if Ekind
(Inst_Par
) = E_Package
then
7321 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
7322 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
7324 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
7326 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
7328 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
7331 elsif Ekind
(Inst_Par
) = E_Generic_Package
7332 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
7334 -- A formal package may be a real child package, and not the
7335 -- implicit instance within a parent. In this case the child is
7336 -- not visible and has to be retrieved explicitly as well.
7338 Gen_Par
:= Inst_Par
;
7341 if Present
(Gen_Par
) then
7343 -- The prefix denotes an instantiation. The entity itself may be a
7344 -- nested generic, or a child unit.
7346 E
:= Find_Generic_Child
(Gen_Par
, S
);
7349 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
7350 Set_Entity
(Gen_Id
, E
);
7351 Set_Etype
(Gen_Id
, Etype
(E
));
7353 Set_Etype
(S
, Etype
(E
));
7355 -- Indicate that this is a reference to the parent
7357 if In_Extended_Main_Source_Unit
(Gen_Id
) then
7358 Set_Is_Instantiated
(Inst_Par
);
7361 -- A common mistake is to replicate the naming scheme of a
7362 -- hierarchy by instantiating a generic child directly, rather
7363 -- than the implicit child in a parent instance:
7365 -- generic .. package Gpar is ..
7366 -- generic .. package Gpar.Child is ..
7367 -- package Par is new Gpar ();
7370 -- package Par.Child is new Gpar.Child ();
7371 -- rather than Par.Child
7373 -- In this case the instantiation is within Par, which is an
7374 -- instance, but Gpar does not denote Par because we are not IN
7375 -- the instance of Gpar, so this is illegal. The test below
7376 -- recognizes this particular case.
7378 if Is_Child_Unit
(E
)
7379 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
7380 and then (not In_Instance
7381 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
7385 ("prefix of generic child unit must be instance of parent",
7389 if not In_Open_Scopes
(Inst_Par
)
7390 and then Nkind
(Parent
(Gen_Id
)) not in
7391 N_Generic_Renaming_Declaration
7393 Install_Parent
(Inst_Par
);
7394 Parent_Installed
:= True;
7396 elsif In_Open_Scopes
(Inst_Par
) then
7398 -- If the parent is already installed, install the actuals
7399 -- for its formal packages. This is necessary when the child
7400 -- instance is a child of the parent instance: in this case,
7401 -- the parent is placed on the scope stack but the formal
7402 -- packages are not made visible.
7404 Install_Formal_Packages
(Inst_Par
);
7408 -- If the generic parent does not contain an entity that
7409 -- corresponds to the selector, the instance doesn't either.
7410 -- Analyzing the node will yield the appropriate error message.
7411 -- If the entity is not a child unit, then it is an inner
7412 -- generic in the parent.
7420 if Is_Child_Unit
(Entity
(Gen_Id
))
7422 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7423 and then not In_Open_Scopes
(Inst_Par
)
7425 Install_Parent
(Inst_Par
);
7426 Parent_Installed
:= True;
7428 -- The generic unit may be the renaming of the implicit child
7429 -- present in an instance. In that case the parent instance is
7430 -- obtained from the name of the renamed entity.
7432 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
7433 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7434 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7437 Renamed_Package
: constant Node_Id
:=
7438 Name
(Parent
(Entity
(Gen_Id
)));
7440 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
7441 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
7442 Install_Parent
(Inst_Par
);
7443 Parent_Installed
:= True;
7449 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
7451 -- Entity already present, analyze prefix, whose meaning may be an
7452 -- instance in the current context. If it is an instance of a
7453 -- relative within another, the proper parent may still have to be
7454 -- installed, if they are not of the same generation.
7456 Analyze
(Prefix
(Gen_Id
));
7458 -- Prevent cascaded errors
7460 if Etype
(Prefix
(Gen_Id
)) = Any_Type
then
7464 -- In the unlikely case that a local declaration hides the name of
7465 -- the parent package, locate it on the homonym chain. If the context
7466 -- is an instance of the parent, the renaming entity is flagged as
7469 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7470 while Present
(Inst_Par
)
7471 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
7473 Inst_Par
:= Homonym
(Inst_Par
);
7476 pragma Assert
(Present
(Inst_Par
));
7477 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
7479 if In_Enclosing_Instance
then
7482 elsif Present
(Entity
(Gen_Id
))
7483 and then No
(Renamed_Entity
(Entity
(Gen_Id
)))
7484 and then Is_Child_Unit
(Entity
(Gen_Id
))
7485 and then not In_Open_Scopes
(Inst_Par
)
7487 Install_Parent
(Inst_Par
);
7488 Parent_Installed
:= True;
7490 -- Handle renaming of generic child unit
7492 elsif Present
(Entity
(Gen_Id
))
7493 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7494 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7501 -- The entity of the renamed generic child unit does not
7502 -- have any reference to the instantiated parent. In order to
7503 -- locate it we traverse the scope containing the renaming
7504 -- declaration; the instance of the parent is available in
7505 -- the prefix of the renaming declaration. For example:
7508 -- package Inst_Par is new ...
7509 -- generic package Ren_Child renames Ins_Par.Child;
7514 -- package Inst_Child is new A.Ren_Child;
7517 E
:= First_Entity
(Entity
(Prefix
(Gen_Id
)));
7518 while Present
(E
) loop
7519 if not Is_Object
(E
)
7520 and then Present
(Renamed_Entity
(E
))
7522 Renamed_Entity
(E
) = Renamed_Entity
(Entity
(Gen_Id
))
7524 Ren_Decl
:= Parent
(E
);
7525 Inst_Par
:= Entity
(Prefix
(Name
(Ren_Decl
)));
7527 if not In_Open_Scopes
(Inst_Par
) then
7528 Install_Parent
(Inst_Par
);
7529 Parent_Installed
:= True;
7535 E
:= Next_Entity
(E
);
7540 elsif In_Enclosing_Instance
then
7542 -- The child unit is found in some enclosing scope
7549 -- If this is the renaming of the implicit child in a parent
7550 -- instance, recover the parent name and install it.
7552 if Is_Entity_Name
(Gen_Id
) then
7553 E
:= Entity
(Gen_Id
);
7555 if Is_Generic_Unit
(E
)
7556 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
7557 and then Is_Child_Unit
(Renamed_Entity
(E
))
7558 and then Is_Generic_Unit
(Scope
(Renamed_Entity
(E
)))
7559 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
7561 Rewrite
(Gen_Id
, New_Copy_Tree
(Name
(Parent
(E
))));
7562 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7564 if not In_Open_Scopes
(Inst_Par
) then
7565 Install_Parent
(Inst_Par
);
7566 Parent_Installed
:= True;
7569 -- If it is a child unit of a non-generic parent, it may be
7570 -- use-visible and given by a direct name. Install parent as
7573 elsif Is_Generic_Unit
(E
)
7574 and then Is_Child_Unit
(E
)
7576 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7577 and then not Is_Generic_Unit
(Scope
(E
))
7579 if not In_Open_Scopes
(Scope
(E
)) then
7580 Install_Parent
(Scope
(E
));
7581 Parent_Installed
:= True;
7586 end Check_Generic_Child_Unit
;
7588 -----------------------------
7589 -- Check_Hidden_Child_Unit --
7590 -----------------------------
7592 procedure Check_Hidden_Child_Unit
7594 Gen_Unit
: Entity_Id
;
7595 Act_Decl_Id
: Entity_Id
)
7597 Gen_Id
: constant Node_Id
:= Name
(N
);
7600 if Is_Child_Unit
(Gen_Unit
)
7601 and then Is_Child_Unit
(Act_Decl_Id
)
7602 and then Nkind
(Gen_Id
) = N_Expanded_Name
7603 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
7604 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
7606 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
7608 ("generic unit & is implicitly declared in &",
7609 Defining_Unit_Name
(N
), Gen_Unit
);
7610 Error_Msg_N
("\instance must have different name",
7611 Defining_Unit_Name
(N
));
7613 end Check_Hidden_Child_Unit
;
7615 ------------------------
7616 -- Check_Private_View --
7617 ------------------------
7619 procedure Check_Private_View
(N
: Node_Id
) is
7620 T
: constant Entity_Id
:= Etype
(N
);
7624 -- Exchange views if the type was not private in the generic but is
7625 -- private at the point of instantiation. Do not exchange views if
7626 -- the scope of the type is in scope. This can happen if both generic
7627 -- and instance are sibling units, or if type is defined in a parent.
7628 -- In this case the visibility of the type will be correct for all
7632 BT
:= Base_Type
(T
);
7634 if Is_Private_Type
(T
)
7635 and then not Has_Private_View
(N
)
7636 and then Present
(Full_View
(T
))
7637 and then not In_Open_Scopes
(Scope
(T
))
7639 -- In the generic, the full declaration was visible
7643 elsif Has_Private_View
(N
)
7644 and then not Is_Private_Type
(T
)
7645 and then not Has_Been_Exchanged
(T
)
7646 and then (not In_Open_Scopes
(Scope
(T
))
7647 or else Nkind
(Parent
(N
)) = N_Subtype_Declaration
)
7649 -- In the generic, only the private declaration was visible
7651 -- If the type appears in a subtype declaration, the subtype in
7652 -- instance must have a view compatible with that of its parent,
7653 -- which must be exchanged (see corresponding code in Restore_
7654 -- Private_Views) so we make an exception to the open scope rule.
7656 Prepend_Elmt
(T
, Exchanged_Views
);
7657 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
7659 -- Finally, a non-private subtype may have a private base type, which
7660 -- must be exchanged for consistency. This can happen when a package
7661 -- body is instantiated, when the scope stack is empty but in fact
7662 -- the subtype and the base type are declared in an enclosing scope.
7664 -- Note that in this case we introduce an inconsistency in the view
7665 -- set, because we switch the base type BT, but there could be some
7666 -- private dependent subtypes of BT which remain unswitched. Such
7667 -- subtypes might need to be switched at a later point (see specific
7668 -- provision for that case in Switch_View).
7670 elsif not Is_Private_Type
(T
)
7671 and then not Has_Private_View
(N
)
7672 and then Is_Private_Type
(BT
)
7673 and then Present
(Full_View
(BT
))
7674 and then not Is_Generic_Type
(BT
)
7675 and then not In_Open_Scopes
(BT
)
7677 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
7678 Exchange_Declarations
(BT
);
7681 end Check_Private_View
;
7683 -----------------------------
7684 -- Check_Hidden_Primitives --
7685 -----------------------------
7687 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
7690 Result
: Elist_Id
:= No_Elist
;
7693 if No
(Assoc_List
) then
7697 -- Traverse the list of associations between formals and actuals
7698 -- searching for renamings of tagged types
7700 Actual
:= First
(Assoc_List
);
7701 while Present
(Actual
) loop
7702 if Nkind
(Actual
) = N_Subtype_Declaration
then
7703 Gen_T
:= Generic_Parent_Type
(Actual
);
7705 if Present
(Gen_T
) and then Is_Tagged_Type
(Gen_T
) then
7707 -- Traverse the list of primitives of the actual types
7708 -- searching for hidden primitives that are visible in the
7709 -- corresponding generic formal; leave them visible and
7710 -- append them to Result to restore their decoration later.
7712 Install_Hidden_Primitives
7713 (Prims_List
=> Result
,
7715 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
7723 end Check_Hidden_Primitives
;
7725 --------------------------
7726 -- Contains_Instance_Of --
7727 --------------------------
7729 function Contains_Instance_Of
7732 N
: Node_Id
) return Boolean
7740 -- Verify that there are no circular instantiations. We check whether
7741 -- the unit contains an instance of the current scope or some enclosing
7742 -- scope (in case one of the instances appears in a subunit). Longer
7743 -- circularities involving subunits might seem too pathological to
7744 -- consider, but they were not too pathological for the authors of
7745 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7746 -- enclosing generic scopes as containing an instance.
7749 -- Within a generic subprogram body, the scope is not generic, to
7750 -- allow for recursive subprograms. Use the declaration to determine
7751 -- whether this is a generic unit.
7753 if Ekind
(Scop
) = E_Generic_Package
7754 or else (Is_Subprogram
(Scop
)
7755 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
7756 N_Generic_Subprogram_Declaration
)
7758 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
7760 while Present
(Elmt
) loop
7761 if Node
(Elmt
) = Scop
then
7762 Error_Msg_Node_2
:= Inner
;
7764 ("circular instantiation: & instantiated within &!",
7768 elsif Node
(Elmt
) = Inner
then
7771 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
7772 Error_Msg_Node_2
:= Inner
;
7774 ("circular instantiation: & instantiated within &!",
7782 -- Indicate that Inner is being instantiated within Scop
7784 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
7787 if Scop
= Standard_Standard
then
7790 Scop
:= Scope
(Scop
);
7795 end Contains_Instance_Of
;
7797 -----------------------
7798 -- Copy_Generic_Node --
7799 -----------------------
7801 function Copy_Generic_Node
7803 Parent_Id
: Node_Id
;
7804 Instantiating
: Boolean) return Node_Id
7809 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
7810 -- Check the given value of one of the Fields referenced by the current
7811 -- node to determine whether to copy it recursively. The field may hold
7812 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
7813 -- Char) in which case it need not be copied.
7815 procedure Copy_Descendants
;
7816 -- Common utility for various nodes
7818 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
7819 -- Make copy of element list
7821 function Copy_Generic_List
7823 Parent_Id
: Node_Id
) return List_Id
;
7824 -- Apply Copy_Generic_Node recursively to the members of a node list
7826 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
7827 -- True if an identifier is part of the defining program unit name of
7829 -- Consider removing this subprogram now that ASIS no longer uses it.
7831 ----------------------
7832 -- Copy_Descendants --
7833 ----------------------
7835 procedure Copy_Descendants
is
7836 procedure Walk
is new
7837 Walk_Sinfo_Fields_Pairwise
(Copy_Generic_Descendant
);
7840 end Copy_Descendants
;
7842 -----------------------------
7843 -- Copy_Generic_Descendant --
7844 -----------------------------
7846 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
7848 if D
= Union_Id
(Empty
) then
7851 elsif D
in Node_Range
then
7853 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
7855 elsif D
in List_Range
then
7856 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
7858 elsif D
in Elist_Range
then
7859 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
7861 -- Nothing else is copyable (e.g. Uint values), return as is
7866 end Copy_Generic_Descendant
;
7868 ------------------------
7869 -- Copy_Generic_Elist --
7870 ------------------------
7872 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
7879 M
:= First_Elmt
(E
);
7880 while Present
(M
) loop
7882 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
7891 end Copy_Generic_Elist
;
7893 -----------------------
7894 -- Copy_Generic_List --
7895 -----------------------
7897 function Copy_Generic_List
7899 Parent_Id
: Node_Id
) return List_Id
7907 Set_Parent
(New_L
, Parent_Id
);
7910 while Present
(N
) loop
7911 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
7920 end Copy_Generic_List
;
7922 ---------------------------
7923 -- In_Defining_Unit_Name --
7924 ---------------------------
7926 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
7929 Present
(Parent
(Nam
))
7930 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
7932 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
7933 and then In_Defining_Unit_Name
(Parent
(Nam
))));
7934 end In_Defining_Unit_Name
;
7936 -- Start of processing for Copy_Generic_Node
7943 New_N
:= New_Copy
(N
);
7945 -- Copy aspects if present
7947 if Has_Aspects
(N
) then
7948 Set_Has_Aspects
(New_N
, False);
7949 Set_Aspect_Specifications
7950 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
7953 -- If we are instantiating, we want to adjust the sloc based on the
7954 -- current S_Adjustment. However, if this is the root node of a subunit,
7955 -- we need to defer that adjustment to below (see "elsif Instantiating
7956 -- and Was_Stub"), so it comes after Create_Instantiation_Source has
7957 -- computed the adjustment.
7960 and then not (Nkind
(N
) in N_Proper_Body
7961 and then Was_Originally_Stub
(N
))
7963 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
7966 if not Is_List_Member
(N
) then
7967 Set_Parent
(New_N
, Parent_Id
);
7970 -- Special casing for identifiers and other entity names and operators
7972 if Nkind
(N
) in N_Character_Literal
7978 if not Instantiating
then
7980 -- Link both nodes in order to assign subsequently the entity of
7981 -- the copy to the original node, in case this is a global
7984 Set_Associated_Node
(N
, New_N
);
7986 -- If we are within an instantiation, this is a nested generic
7987 -- that has already been analyzed at the point of definition.
7988 -- We must preserve references that were global to the enclosing
7989 -- parent at that point. Other occurrences, whether global or
7990 -- local to the current generic, must be resolved anew, so we
7991 -- reset the entity in the generic copy. A global reference has a
7992 -- smaller depth than the parent, or else the same depth in case
7993 -- both are distinct compilation units.
7995 -- A child unit is implicitly declared within the enclosing parent
7996 -- but is in fact global to it, and must be preserved.
7998 -- It is also possible for Current_Instantiated_Parent to be
7999 -- defined, and for this not to be a nested generic, namely if
8000 -- the unit is loaded through Rtsfind. In that case, the entity of
8001 -- New_N is only a link to the associated node, and not a defining
8004 -- The entities for parent units in the defining_program_unit of a
8005 -- generic child unit are established when the context of the unit
8006 -- is first analyzed, before the generic copy is made. They are
8007 -- preserved in the copy for use in e.g. ASIS queries.
8009 Ent
:= Entity
(New_N
);
8011 if No
(Current_Instantiated_Parent
.Gen_Id
) then
8013 or else Nkind
(Ent
) /= N_Defining_Identifier
8014 or else not In_Defining_Unit_Name
(N
)
8016 Set_Associated_Node
(New_N
, Empty
);
8020 or else Nkind
(Ent
) not in N_Entity
8021 or else No
(Scope
(Ent
))
8023 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
8024 and then not Is_Child_Unit
(Ent
))
8026 (Scope_Depth_Set
(Scope
(Ent
))
8028 Scope_Depth
(Scope
(Ent
)) >
8029 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
8031 Get_Source_Unit
(Ent
) =
8032 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
8034 Set_Associated_Node
(New_N
, Empty
);
8037 -- Case of instantiating identifier or some other name or operator
8040 -- If the associated node is still defined, the entity in it
8041 -- is global, and must be copied to the instance. If this copy
8042 -- is being made for a body to inline, it is applied to an
8043 -- instantiated tree, and the entity is already present and
8044 -- must be also preserved.
8047 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
8050 if Present
(Assoc
) then
8051 if Nkind
(Assoc
) = Nkind
(N
) then
8052 Set_Entity
(New_N
, Entity
(Assoc
));
8053 Check_Private_View
(N
);
8055 -- Here we deal with a very peculiar case for which the
8056 -- Has_Private_View mechanism is not sufficient, because
8057 -- the reference to the type is implicit in the tree,
8058 -- that is to say, it's not referenced from a node but
8059 -- only from another type, namely through Component_Type.
8063 -- type Pt is private;
8066 -- type Ft is array (Positive range <>) of Pt;
8068 -- procedure Check (F1, F2 : Ft; Lt : Boolean);
8072 -- type Pt is new Boolean;
8075 -- package body P is
8076 -- package body G is
8077 -- procedure Check (F1, F2 : Ft; Lt : Boolean) is
8079 -- if (F1 < F2) /= Lt then
8086 -- type Arr is array (Positive range <>) of P.Pt;
8088 -- package Inst is new P.G (Arr);
8090 -- Pt is a global type for the generic package G and it
8091 -- is not referenced in its body, but only as component
8092 -- type of Ft, which is a local type. This means that no
8093 -- references to Pt or Ft are seen during the copy of the
8094 -- body, the only reference to Pt being seen is when the
8095 -- actuals are checked by Check_Generic_Actuals, but Pt
8096 -- is still private at this point. In the end, the views
8097 -- of Pt are not switched in the body and, therefore, the
8098 -- array comparison is rejected because the component is
8101 -- Adding e.g. a dummy variable of type Pt in the body is
8102 -- sufficient to make everything work, so we generate an
8103 -- artificial reference to Pt on the fly and thus force
8104 -- the switching of views on the grounds that, if the
8105 -- comparison was accepted during the semantic analysis
8106 -- of the generic, this means that the component cannot
8107 -- have been private (see Sem_Type.Valid_Comparison_Arg).
8109 if Nkind
(Assoc
) in N_Op_Compare
8110 and then Present
(Etype
(Left_Opnd
(Assoc
)))
8111 and then Is_Array_Type
(Etype
(Left_Opnd
(Assoc
)))
8112 and then Present
(Etype
(Right_Opnd
(Assoc
)))
8113 and then Is_Array_Type
(Etype
(Right_Opnd
(Assoc
)))
8116 Ltyp
: constant Entity_Id
:=
8117 Etype
(Left_Opnd
(Assoc
));
8118 Rtyp
: constant Entity_Id
:=
8119 Etype
(Right_Opnd
(Assoc
));
8121 if Is_Private_Type
(Component_Type
(Ltyp
)) then
8123 (New_Occurrence_Of
(Component_Type
(Ltyp
),
8126 if Is_Private_Type
(Component_Type
(Rtyp
)) then
8128 (New_Occurrence_Of
(Component_Type
(Rtyp
),
8133 -- Here is a similar case, for the Designated_Type of an
8134 -- access type that is present as target type in a type
8135 -- conversion from another access type. In this case, if
8136 -- the base types of the designated types are different
8137 -- and the conversion was accepted during the semantic
8138 -- analysis of the generic, this means that the target
8139 -- type cannot have been private (see Valid_Conversion).
8141 elsif Nkind
(Assoc
) = N_Identifier
8142 and then Nkind
(Parent
(Assoc
)) = N_Type_Conversion
8143 and then Subtype_Mark
(Parent
(Assoc
)) = Assoc
8144 and then Present
(Etype
(Assoc
))
8145 and then Is_Access_Type
(Etype
(Assoc
))
8146 and then Present
(Etype
(Expression
(Parent
(Assoc
))))
8148 Is_Access_Type
(Etype
(Expression
(Parent
(Assoc
))))
8151 Targ_Desig
: constant Entity_Id
:=
8152 Designated_Type
(Etype
(Assoc
));
8153 Expr_Desig
: constant Entity_Id
:=
8155 (Etype
(Expression
(Parent
(Assoc
))));
8157 if Base_Type
(Targ_Desig
) /= Base_Type
(Expr_Desig
)
8158 and then Is_Private_Type
(Targ_Desig
)
8161 (New_Occurrence_Of
(Targ_Desig
, Sloc
(N
)));
8166 -- The node is a reference to a global type and acts as the
8167 -- subtype mark of a qualified expression created in order
8168 -- to aid resolution of accidental overloading in instances.
8169 -- Since N is a reference to a type, the Associated_Node of
8170 -- N denotes an entity rather than another identifier. See
8171 -- Qualify_Universal_Operands for details.
8173 elsif Nkind
(N
) = N_Identifier
8174 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
8175 and then Subtype_Mark
(Parent
(N
)) = N
8176 and then Is_Qualified_Universal_Literal
(Parent
(N
))
8178 Set_Entity
(New_N
, Assoc
);
8180 -- Cope with the rewriting into expanded name that may have
8181 -- occurred in between, e.g. in Check_Generic_Child_Unit for
8182 -- generic renaming declarations.
8184 elsif Nkind
(Assoc
) = N_Expanded_Name
then
8185 Rewrite
(N
, New_Copy_Tree
(Assoc
));
8186 Set_Associated_Node
(N
, Assoc
);
8187 return Copy_Generic_Node
(N
, Parent_Id
, Instantiating
);
8189 -- The name in the call may be a selected component if the
8190 -- call has not been analyzed yet, as may be the case for
8191 -- pre/post conditions in a generic unit.
8193 elsif Nkind
(Assoc
) = N_Function_Call
8194 and then Is_Entity_Name
(Name
(Assoc
))
8196 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
8197 Check_Private_View
(N
);
8199 elsif Nkind
(Assoc
) in N_Entity
8200 and then (Expander_Active
8201 or else (GNATprove_Mode
8202 and then not In_Spec_Expression
8203 and then not Inside_A_Generic
))
8205 -- Inlining case: we are copying a tree that contains
8206 -- global entities, which are preserved in the copy to be
8207 -- used for subsequent inlining.
8212 Set_Entity
(New_N
, Empty
);
8218 -- For expanded name, we must copy the Prefix and Selector_Name
8220 if Nkind
(N
) = N_Expanded_Name
then
8222 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
8224 Set_Selector_Name
(New_N
,
8225 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
8227 -- For operators, copy the operands
8229 elsif Nkind
(N
) in N_Op
then
8230 if Nkind
(N
) in N_Binary_Op
then
8231 Set_Left_Opnd
(New_N
,
8232 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
8235 Set_Right_Opnd
(New_N
,
8236 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
8239 -- Establish a link between an entity from the generic template and the
8240 -- corresponding entity in the generic copy to be analyzed.
8242 elsif Nkind
(N
) in N_Entity
then
8243 if not Instantiating
then
8244 Set_Associated_Entity
(N
, New_N
);
8247 -- Clear any existing link the copy may inherit from the replicated
8248 -- generic template entity.
8250 Set_Associated_Entity
(New_N
, Empty
);
8252 -- Special casing for stubs
8254 elsif Nkind
(N
) in N_Body_Stub
then
8256 -- In any case, we must copy the specification or defining
8257 -- identifier as appropriate.
8259 if Nkind
(N
) = N_Subprogram_Body_Stub
then
8260 Set_Specification
(New_N
,
8261 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
8264 Set_Defining_Identifier
(New_N
,
8266 (Defining_Identifier
(N
), New_N
, Instantiating
));
8269 -- If we are not instantiating, then this is where we load and
8270 -- analyze subunits, i.e. at the point where the stub occurs. A
8271 -- more permissive system might defer this analysis to the point
8272 -- of instantiation, but this seems too complicated for now.
8274 if not Instantiating
then
8276 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
8278 Unum
: Unit_Number_Type
;
8282 -- Make sure that, if it is a subunit of the main unit that is
8283 -- preprocessed and if -gnateG is specified, the preprocessed
8284 -- file will be written.
8286 Lib
.Analysing_Subunit_Of_Main
:=
8287 Lib
.In_Extended_Main_Source_Unit
(N
);
8290 (Load_Name
=> Subunit_Name
,
8294 Lib
.Analysing_Subunit_Of_Main
:= False;
8296 -- If the proper body is not found, a warning message will be
8297 -- emitted when analyzing the stub, or later at the point of
8298 -- instantiation. Here we just leave the stub as is.
8300 if Unum
= No_Unit
then
8301 Subunits_Missing
:= True;
8302 goto Subunit_Not_Found
;
8305 Subunit
:= Cunit
(Unum
);
8307 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
8309 ("found child unit instead of expected SEPARATE subunit",
8311 Error_Msg_Sloc
:= Sloc
(N
);
8312 Error_Msg_N
("\to complete stub #", Subunit
);
8313 goto Subunit_Not_Found
;
8316 -- We must create a generic copy of the subunit, in order to
8317 -- perform semantic analysis on it, and we must replace the
8318 -- stub in the original generic unit with the subunit, in order
8319 -- to preserve non-local references within.
8321 -- Only the proper body needs to be copied. Library_Unit and
8322 -- context clause are simply inherited by the generic copy.
8323 -- Note that the copy (which may be recursive if there are
8324 -- nested subunits) must be done first, before attaching it to
8325 -- the enclosing generic.
8329 (Proper_Body
(Unit
(Subunit
)),
8330 Empty
, Instantiating
=> False);
8332 -- Now place the original proper body in the original generic
8333 -- unit. This is a body, not a compilation unit.
8335 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
8336 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
8337 Set_Was_Originally_Stub
(N
);
8339 -- Finally replace the body of the subunit with its copy, and
8340 -- make this new subunit into the library unit of the generic
8341 -- copy, which does not have stubs any longer.
8343 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
8344 Set_Library_Unit
(New_N
, Subunit
);
8345 Inherit_Context
(Unit
(Subunit
), N
);
8348 -- If we are instantiating, this must be an error case, since
8349 -- otherwise we would have replaced the stub node by the proper body
8350 -- that corresponds. So just ignore it in the copy (i.e. we have
8351 -- copied it, and that is good enough).
8357 <<Subunit_Not_Found
>> null;
8359 -- If the node is a compilation unit, it is the subunit of a stub, which
8360 -- has been loaded already (see code below). In this case, the library
8361 -- unit field of N points to the parent unit (which is a compilation
8362 -- unit) and need not (and cannot) be copied.
8364 -- When the proper body of the stub is analyzed, the library_unit link
8365 -- is used to establish the proper context (see sem_ch10).
8367 -- The other fields of a compilation unit are copied as usual
8369 elsif Nkind
(N
) = N_Compilation_Unit
then
8371 -- This code can only be executed when not instantiating, because in
8372 -- the copy made for an instantiation, the compilation unit node has
8373 -- disappeared at the point that a stub is replaced by its proper
8376 pragma Assert
(not Instantiating
);
8378 Set_Context_Items
(New_N
,
8379 Copy_Generic_List
(Context_Items
(N
), New_N
));
8382 Copy_Generic_Node
(Unit
(N
), New_N
, Instantiating
=> False));
8384 Set_First_Inlined_Subprogram
(New_N
,
8386 (First_Inlined_Subprogram
(N
), New_N
, Instantiating
=> False));
8391 (Aux_Decls_Node
(N
), New_N
, Instantiating
=> False));
8393 -- For an assignment node, the assignment is known to be semantically
8394 -- legal if we are instantiating the template. This avoids incorrect
8395 -- diagnostics in generated code.
8397 elsif Nkind
(N
) = N_Assignment_Statement
then
8399 -- Copy name and expression fields in usual manner
8402 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
8404 Set_Expression
(New_N
,
8405 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
8407 if Instantiating
then
8408 Set_Assignment_OK
(Name
(New_N
), True);
8411 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
8412 if not Instantiating
then
8413 Set_Associated_Node
(N
, New_N
);
8416 if Present
(Get_Associated_Node
(N
))
8417 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
8419 -- In the generic the aggregate has some composite type. If at
8420 -- the point of instantiation the type has a private view,
8421 -- install the full view (and that of its ancestors, if any).
8424 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
8428 if Present
(T
) and then Is_Private_Type
(T
) then
8433 and then Is_Tagged_Type
(T
)
8434 and then Is_Derived_Type
(T
)
8436 Rt
:= Root_Type
(T
);
8441 if Is_Private_Type
(T
) then
8452 -- Do not copy the associated node, which points to the generic copy
8453 -- of the aggregate.
8455 if Nkind
(N
) = N_Aggregate
then
8456 Set_Aggregate_Bounds
8458 Node_Id
(Copy_Generic_Descendant
8459 (Union_Id
(Aggregate_Bounds
(N
)))));
8461 elsif Nkind
(N
) = N_Extension_Aggregate
then
8464 Node_Id
(Copy_Generic_Descendant
8465 (Union_Id
(Ancestor_Part
(N
)))));
8468 pragma Assert
(False);
8473 List_Id
(Copy_Generic_Descendant
(Union_Id
(Expressions
(N
)))));
8474 Set_Component_Associations
8476 List_Id
(Copy_Generic_Descendant
8477 (Union_Id
(Component_Associations
(N
)))));
8479 (New_N
, Node_Id
(Copy_Generic_Descendant
(Union_Id
(Etype
(N
)))));
8481 -- Allocators do not have an identifier denoting the access type, so we
8482 -- must locate it through the expression to check whether the views are
8485 elsif Nkind
(N
) = N_Allocator
8486 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
8487 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
8488 and then Instantiating
8491 T
: constant Node_Id
:=
8492 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
8498 -- Retrieve the allocator node in the generic copy
8500 Acc_T
:= Etype
(Parent
(Parent
(T
)));
8502 if Present
(Acc_T
) and then Is_Private_Type
(Acc_T
) then
8503 Switch_View
(Acc_T
);
8510 -- For a proper body, we must catch the case of a proper body that
8511 -- replaces a stub. This represents the point at which a separate
8512 -- compilation unit, and hence template file, may be referenced, so we
8513 -- must make a new source instantiation entry for the template of the
8514 -- subunit, and ensure that all nodes in the subunit are adjusted using
8515 -- this new source instantiation entry.
8517 elsif Nkind
(N
) in N_Proper_Body
then
8519 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
8521 if Instantiating
and then Was_Originally_Stub
(N
) then
8522 Create_Instantiation_Source
8523 (Instantiation_Node
,
8524 Defining_Entity
(N
),
8527 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8530 -- Now copy the fields of the proper body, using the new
8531 -- adjustment factor if one was needed as per test above.
8535 -- Restore the original adjustment factor
8537 S_Adjustment
:= Save_Adjustment
;
8540 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
8542 -- Do not copy Comment or Ident pragmas their content is relevant to
8543 -- the generic unit, not to the instantiating unit.
8545 if Pragma_Name_Unmapped
(N
) in Name_Comment | Name_Ident
then
8546 New_N
:= Make_Null_Statement
(Sloc
(N
));
8548 -- Do not copy pragmas generated from aspects because the pragmas do
8549 -- not carry any semantic information, plus they will be regenerated
8552 -- However, generating C we need to copy them since postconditions
8553 -- are inlined by the front end, and the front-end inlining machinery
8554 -- relies on this routine to perform inlining.
8556 elsif From_Aspect_Specification
(N
)
8557 and then not Modify_Tree_For_C
8559 New_N
:= Make_Null_Statement
(Sloc
(N
));
8565 elsif Nkind
(N
) in N_Integer_Literal | N_Real_Literal
then
8567 -- No descendant fields need traversing
8571 elsif Nkind
(N
) = N_String_Literal
8572 and then Present
(Etype
(N
))
8573 and then Instantiating
8575 -- If the string is declared in an outer scope, the string_literal
8576 -- subtype created for it may have the wrong scope. Force reanalysis
8577 -- of the constant to generate a new itype in the proper context.
8579 Set_Etype
(New_N
, Empty
);
8580 Set_Analyzed
(New_N
, False);
8582 -- For the remaining nodes, copy their descendants recursively
8587 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
8588 Set_Generic_Parent
(Specification
(New_N
), N
);
8590 -- Should preserve Corresponding_Spec??? (12.3(14))
8594 -- Propagate dimensions if present, so that they are reflected in the
8597 if Nkind
(N
) in N_Has_Etype
8598 and then (Nkind
(N
) in N_Op
or else Is_Entity_Name
(N
))
8599 and then Present
(Etype
(N
))
8600 and then Is_Floating_Point_Type
(Etype
(N
))
8601 and then Has_Dimension_System
(Etype
(N
))
8603 Copy_Dimensions
(N
, New_N
);
8607 end Copy_Generic_Node
;
8609 ----------------------------
8610 -- Denotes_Formal_Package --
8611 ----------------------------
8613 function Denotes_Formal_Package
8615 On_Exit
: Boolean := False;
8616 Instance
: Entity_Id
:= Empty
) return Boolean
8619 Scop
: constant Entity_Id
:= Scope
(Pack
);
8622 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
8623 -- The package in question may be an actual for a previous formal
8624 -- package P of the current instance, so examine its actuals as well.
8625 -- This must be recursive over other formal packages.
8627 ----------------------------------
8628 -- Is_Actual_Of_Previous_Formal --
8629 ----------------------------------
8631 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
8635 E1
:= First_Entity
(P
);
8636 while Present
(E1
) and then E1
/= Instance
loop
8637 if Ekind
(E1
) = E_Package
8638 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
8640 if Renamed_Entity
(E1
) = Pack
then
8643 elsif E1
= P
or else Renamed_Entity
(E1
) = P
then
8646 elsif Is_Actual_Of_Previous_Formal
(E1
) then
8655 end Is_Actual_Of_Previous_Formal
;
8657 -- Start of processing for Denotes_Formal_Package
8663 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
8665 Par
:= Current_Instantiated_Parent
.Act_Id
;
8668 if Ekind
(Scop
) = E_Generic_Package
8669 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
8670 N_Generic_Subprogram_Declaration
8674 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
8675 N_Formal_Package_Declaration
8683 -- Check whether this package is associated with a formal package of
8684 -- the enclosing instantiation. Iterate over the list of renamings.
8686 E
:= First_Entity
(Par
);
8687 while Present
(E
) loop
8688 if Ekind
(E
) /= E_Package
8689 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
8693 elsif Renamed_Entity
(E
) = Par
then
8696 elsif Renamed_Entity
(E
) = Pack
then
8699 elsif Is_Actual_Of_Previous_Formal
(E
) then
8709 end Denotes_Formal_Package
;
8715 procedure End_Generic
is
8717 -- ??? More things could be factored out in this routine. Should
8718 -- probably be done at a later stage.
8720 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
8721 Generic_Flags
.Decrement_Last
;
8723 Expander_Mode_Restore
;
8730 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
8731 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
8732 -- Find distance from given node to enclosing compilation unit
8738 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
8741 and then Nkind
(P
) /= N_Compilation_Unit
8743 P
:= True_Parent
(P
);
8748 -- Local declarations
8757 -- Start of processing for Earlier
8760 Find_Depth
(P1
, D1
);
8761 Find_Depth
(P2
, D2
);
8771 P1
:= True_Parent
(P1
);
8776 P2
:= True_Parent
(P2
);
8780 -- At this point P1 and P2 are at the same distance from the root.
8781 -- We examine their parents until we find a common declarative list.
8782 -- If we reach the root, N1 and N2 do not descend from the same
8783 -- declarative list (e.g. one is nested in the declarative part and
8784 -- the other is in a block in the statement part) and the earlier
8785 -- one is already frozen.
8787 while not Is_List_Member
(P1
)
8788 or else not Is_List_Member
(P2
)
8789 or else not In_Same_List
(P1
, P2
)
8791 P1
:= True_Parent
(P1
);
8792 P2
:= True_Parent
(P2
);
8794 if Nkind
(Parent
(P1
)) = N_Subunit
then
8795 P1
:= Corresponding_Stub
(Parent
(P1
));
8798 if Nkind
(Parent
(P2
)) = N_Subunit
then
8799 P2
:= Corresponding_Stub
(Parent
(P2
));
8807 -- Expanded code usually shares the source location of the original
8808 -- construct it was generated for. This however may not necessarily
8809 -- reflect the true location of the code within the tree.
8811 -- Before comparing the slocs of the two nodes, make sure that we are
8812 -- working with correct source locations. Assume that P1 is to the left
8813 -- of P2. If either one does not come from source, traverse the common
8814 -- list heading towards the other node and locate the first source
8818 -- ----+===+===+--------------+===+===+----
8819 -- expanded code expanded code
8821 if not Comes_From_Source
(P1
) then
8822 while Present
(P1
) loop
8824 -- Neither P2 nor a source statement were located during the
8825 -- search. If we reach the end of the list, then P1 does not
8826 -- occur earlier than P2.
8829 -- start --- P2 ----- P1 --- end
8831 if No
(Next
(P1
)) then
8834 -- We encounter P2 while going to the right of the list. This
8835 -- means that P1 does indeed appear earlier.
8838 -- start --- P1 ===== P2 --- end
8839 -- expanded code in between
8844 -- No need to look any further since we have located a source
8847 elsif Comes_From_Source
(P1
) then
8857 if not Comes_From_Source
(P2
) then
8858 while Present
(P2
) loop
8860 -- Neither P1 nor a source statement were located during the
8861 -- search. If we reach the start of the list, then P1 does not
8862 -- occur earlier than P2.
8865 -- start --- P2 --- P1 --- end
8867 if No
(Prev
(P2
)) then
8870 -- We encounter P1 while going to the left of the list. This
8871 -- means that P1 does indeed appear earlier.
8874 -- start --- P1 ===== P2 --- end
8875 -- expanded code in between
8880 -- No need to look any further since we have located a source
8883 elsif Comes_From_Source
(P2
) then
8893 -- At this point either both nodes came from source or we approximated
8894 -- their source locations through neighboring source statements.
8896 T1
:= Top_Level_Location
(Sloc
(P1
));
8897 T2
:= Top_Level_Location
(Sloc
(P2
));
8899 -- When two nodes come from the same instance, they have identical top
8900 -- level locations. To determine proper relation within the tree, check
8901 -- their locations within the template.
8904 return Sloc
(P1
) < Sloc
(P2
);
8906 -- The two nodes either come from unrelated instances or do not come
8907 -- from instantiated code at all.
8914 ----------------------
8915 -- Find_Actual_Type --
8916 ----------------------
8918 function Find_Actual_Type
8920 Gen_Type
: Entity_Id
) return Entity_Id
8922 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
8926 -- Special processing only applies to child units
8928 if not Is_Child_Unit
(Gen_Scope
) then
8929 return Get_Instance_Of
(Typ
);
8931 -- If designated or component type is itself a formal of the child unit,
8932 -- its instance is available.
8934 elsif Scope
(Typ
) = Gen_Scope
then
8935 return Get_Instance_Of
(Typ
);
8937 -- If the array or access type is not declared in the parent unit,
8938 -- no special processing needed.
8940 elsif not Is_Generic_Type
(Typ
)
8941 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
8943 return Get_Instance_Of
(Typ
);
8945 -- Otherwise, retrieve designated or component type by visibility
8948 T
:= Current_Entity
(Typ
);
8949 while Present
(T
) loop
8950 if In_Open_Scopes
(Scope
(T
)) then
8952 elsif Is_Generic_Actual_Type
(T
) then
8961 end Find_Actual_Type
;
8963 -----------------------------
8964 -- Freeze_Package_Instance --
8965 -----------------------------
8967 procedure Freeze_Package_Instance
8973 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean;
8974 -- Check if the generic definition and the instantiation come from
8975 -- a common scope, in which case the instance must be frozen after
8976 -- the generic body.
8978 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
;
8979 -- If the instance is nested inside a generic unit, the Sloc of the
8980 -- instance indicates the place of the original definition, not the
8981 -- point of the current enclosing instance. Pending a better usage of
8982 -- Slocs to indicate instantiation places, we determine the place of
8983 -- origin of a node by finding the maximum sloc of any ancestor node.
8985 -- Why is this not equivalent to Top_Level_Location ???
8991 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean is
8992 Act_Scop
: Entity_Id
:= Scope
(Act_Id
);
8993 Gen_Scop
: Entity_Id
:= Scope
(Gen_Id
);
8996 while Act_Scop
/= Standard_Standard
8997 and then Gen_Scop
/= Standard_Standard
8999 if Act_Scop
= Gen_Scop
then
9003 Act_Scop
:= Scope
(Act_Scop
);
9004 Gen_Scop
:= Scope
(Gen_Scop
);
9014 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
is
9021 while Present
(N1
) and then N1
/= Act_Unit
loop
9022 if Sloc
(N1
) > Res
then
9034 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N
);
9035 Par_Id
: constant Entity_Id
:= Scope
(Gen_Id
);
9036 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
9037 Gen_Unit
: constant Node_Id
:=
9038 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
9040 Body_Unit
: Node_Id
;
9042 Must_Delay
: Boolean;
9043 Orig_Body
: Node_Id
;
9045 -- Start of processing for Freeze_Package_Instance
9048 -- If the body is a subunit, the freeze point is the corresponding stub
9049 -- in the current compilation, not the subunit itself.
9051 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
9052 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
9054 Orig_Body
:= Gen_Body
;
9057 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
9059 -- If the instantiation and the generic definition appear in the same
9060 -- package declaration, this is an early instantiation. If they appear
9061 -- in the same declarative part, it is an early instantiation only if
9062 -- the generic body appears textually later, and the generic body is
9063 -- also in the main unit.
9065 -- If instance is nested within a subprogram, and the generic body
9066 -- is not, the instance is delayed because the enclosing body is. If
9067 -- instance and body are within the same scope, or the same subprogram
9068 -- body, indicate explicitly that the instance is delayed.
9071 (Gen_Unit
= Act_Unit
9072 and then (Nkind
(Gen_Unit
) in N_Generic_Package_Declaration
9073 | N_Package_Declaration
9074 or else (Gen_Unit
= Body_Unit
9076 True_Sloc
(N
, Act_Unit
) < Sloc
(Orig_Body
)))
9077 and then Is_In_Main_Unit
(Original_Node
(Gen_Unit
))
9078 and then In_Same_Scope
(Gen_Id
, Act_Id
));
9080 -- If this is an early instantiation, the freeze node is placed after
9081 -- the generic body. Otherwise, if the generic appears in an instance,
9082 -- we cannot freeze the current instance until the outer one is frozen.
9083 -- This is only relevant if the current instance is nested within some
9084 -- inner scope not itself within the outer instance. If this scope is
9085 -- a package body in the same declarative part as the outer instance,
9086 -- then that body needs to be frozen after the outer instance. Finally,
9087 -- if no delay is needed, we place the freeze node at the end of the
9088 -- current declarative part.
9090 if No
(Freeze_Node
(Act_Id
))
9091 or else not Is_List_Member
(Freeze_Node
(Act_Id
))
9093 Ensure_Freeze_Node
(Act_Id
);
9094 F_Node
:= Freeze_Node
(Act_Id
);
9097 Insert_After
(Orig_Body
, F_Node
);
9099 elsif Is_Generic_Instance
(Par_Id
)
9100 and then Present
(Freeze_Node
(Par_Id
))
9101 and then Scope
(Act_Id
) /= Par_Id
9103 -- Freeze instance of inner generic after instance of enclosing
9106 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
) then
9108 -- Handle the following case:
9110 -- package Parent_Inst is new ...
9111 -- freeze Parent_Inst []
9113 -- procedure P ... -- this body freezes Parent_Inst
9115 -- package Inst is new ...
9117 -- In this particular scenario, the freeze node for Inst must
9118 -- be inserted in the same manner as that of Parent_Inst,
9119 -- before the next source body or at the end of the declarative
9120 -- list (body not available). If body P did not exist and
9121 -- Parent_Inst was frozen after Inst, either by a body
9122 -- following Inst or at the end of the declarative region,
9123 -- the freeze node for Inst must be inserted after that of
9124 -- Parent_Inst. This relation is established by comparing
9125 -- the Slocs of Parent_Inst freeze node and Inst.
9126 -- We examine the parents of the enclosing lists to handle
9127 -- the case where the parent instance is in the visible part
9128 -- of a package declaration, and the inner instance is in
9129 -- the corresponding private part.
9131 if Parent
(List_Containing
(Freeze_Node
(Par_Id
)))
9132 = Parent
(List_Containing
(N
))
9133 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9135 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9137 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9140 -- Freeze package enclosing instance of inner generic after
9141 -- instance of enclosing generic.
9143 elsif Nkind
(Parent
(N
)) in N_Package_Body | N_Subprogram_Body
9144 and then In_Same_Declarative_Part
9145 (Parent
(Freeze_Node
(Par_Id
)), Parent
(N
))
9148 Enclosing
: Entity_Id
;
9151 Enclosing
:= Corresponding_Spec
(Parent
(N
));
9153 if No
(Enclosing
) then
9154 Enclosing
:= Defining_Entity
(Parent
(N
));
9157 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9158 Ensure_Freeze_Node
(Enclosing
);
9160 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
9162 -- The enclosing context is a subunit, insert the freeze
9163 -- node after the stub.
9165 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
9166 Insert_Freeze_Node_For_Instance
9167 (Corresponding_Stub
(Parent
(Parent
(N
))),
9168 Freeze_Node
(Enclosing
));
9170 -- The enclosing context is a package with a stub body
9171 -- which has already been replaced by the real body.
9172 -- Insert the freeze node after the actual body.
9174 elsif Ekind
(Enclosing
) = E_Package
9175 and then Present
(Body_Entity
(Enclosing
))
9176 and then Was_Originally_Stub
9177 (Parent
(Body_Entity
(Enclosing
)))
9179 Insert_Freeze_Node_For_Instance
9180 (Parent
(Body_Entity
(Enclosing
)),
9181 Freeze_Node
(Enclosing
));
9183 -- The parent instance has been frozen before the body of
9184 -- the enclosing package, insert the freeze node after
9187 elsif In_Same_List
(Freeze_Node
(Par_Id
), Parent
(N
))
9189 Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(Parent
(N
))
9191 Insert_Freeze_Node_For_Instance
9192 (Parent
(N
), Freeze_Node
(Enclosing
));
9196 (Freeze_Node
(Par_Id
), Freeze_Node
(Enclosing
));
9202 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9206 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9209 end Freeze_Package_Instance
;
9211 --------------------------------
9212 -- Freeze_Subprogram_Instance --
9213 --------------------------------
9215 procedure Freeze_Subprogram_Instance
9218 Pack_Id
: Entity_Id
)
9220 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
9221 -- Find innermost package body that encloses the given node, and which
9222 -- is not a compilation unit. Freeze nodes for the instance, or for its
9223 -- enclosing body, may be inserted after the enclosing_body of the
9224 -- generic unit. Used to determine proper placement of freeze node for
9225 -- both package and subprogram instances.
9227 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
9228 -- Find entity for given package body, and locate or create a freeze
9231 ----------------------------
9232 -- Enclosing_Package_Body --
9233 ----------------------------
9235 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
9241 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9243 if Nkind
(P
) = N_Package_Body
then
9244 if Nkind
(Parent
(P
)) = N_Subunit
then
9245 return Corresponding_Stub
(Parent
(P
));
9251 P
:= True_Parent
(P
);
9255 end Enclosing_Package_Body
;
9257 -------------------------
9258 -- Package_Freeze_Node --
9259 -------------------------
9261 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
9265 if Nkind
(B
) = N_Package_Body
then
9266 Id
:= Corresponding_Spec
(B
);
9267 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
9268 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
9271 Ensure_Freeze_Node
(Id
);
9272 return Freeze_Node
(Id
);
9273 end Package_Freeze_Node
;
9277 Enc_G
: constant Node_Id
:= Enclosing_Package_Body
(Gen_Body
);
9278 Enc_N
: constant Node_Id
:= Enclosing_Package_Body
(N
);
9279 Par_Id
: constant Entity_Id
:= Scope
(Get_Generic_Entity
(N
));
9284 -- Start of processing for Freeze_Subprogram_Instance
9287 -- If the instance and the generic body appear within the same unit, and
9288 -- the instance precedes the generic, the freeze node for the instance
9289 -- must appear after that of the generic. If the generic is nested
9290 -- within another instance I2, then current instance must be frozen
9291 -- after I2. In both cases, the freeze nodes are those of enclosing
9292 -- packages. Otherwise, the freeze node is placed at the end of the
9293 -- current declarative part.
9295 Ensure_Freeze_Node
(Pack_Id
);
9296 F_Node
:= Freeze_Node
(Pack_Id
);
9298 if Is_Generic_Instance
(Par_Id
)
9299 and then Present
(Freeze_Node
(Par_Id
))
9300 and then In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
)
9302 -- The parent was a premature instantiation. Insert freeze node at
9303 -- the end the current declarative part.
9305 if Is_Known_Guaranteed_ABE
(Get_Unit_Instantiation_Node
(Par_Id
)) then
9306 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9308 -- Handle the following case:
9310 -- package Parent_Inst is new ...
9311 -- freeze Parent_Inst []
9313 -- procedure P ... -- this body freezes Parent_Inst
9315 -- procedure Inst is new ...
9317 -- In this particular scenario, the freeze node for Inst must be
9318 -- inserted in the same manner as that of Parent_Inst - before the
9319 -- next source body or at the end of the declarative list (body not
9320 -- available). If body P did not exist and Parent_Inst was frozen
9321 -- after Inst, either by a body following Inst or at the end of the
9322 -- declarative region, the freeze node for Inst must be inserted
9323 -- after that of Parent_Inst. This relation is established by
9324 -- comparing the Slocs of Parent_Inst freeze node and Inst.
9326 elsif In_Same_List
(Freeze_Node
(Par_Id
), N
)
9327 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9329 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9332 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9335 -- The body enclosing the instance should be frozen after the body that
9336 -- includes the generic, because the body of the instance may make
9337 -- references to entities therein. If the two are not in the same
9338 -- declarative part, or if the one enclosing the instance is frozen
9339 -- already, freeze the instance at the end of the current declarative
9342 elsif Is_Generic_Instance
(Par_Id
)
9343 and then Present
(Freeze_Node
(Par_Id
))
9344 and then Present
(Enc_N
)
9346 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), Enc_N
)
9348 -- The enclosing package may contain several instances. Rather
9349 -- than computing the earliest point at which to insert its freeze
9350 -- node, we place it at the end of the declarative part of the
9351 -- parent of the generic.
9353 Insert_Freeze_Node_For_Instance
9354 (Freeze_Node
(Par_Id
), Package_Freeze_Node
(Enc_N
));
9357 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9359 elsif Present
(Enc_G
)
9360 and then Present
(Enc_N
)
9361 and then Enc_G
/= Enc_N
9362 and then Earlier
(N
, Gen_Body
)
9364 -- Freeze package that encloses instance, and place node after the
9365 -- package that encloses generic. If enclosing package is already
9366 -- frozen we have to assume it is at the proper place. This may be a
9367 -- potential ABE that requires dynamic checking. Do not add a freeze
9368 -- node if the package that encloses the generic is inside the body
9369 -- that encloses the instance, because the freeze node would be in
9370 -- the wrong scope. Additional contortions needed if the bodies are
9371 -- within a subunit.
9374 Enclosing_Body
: Node_Id
;
9377 if Nkind
(Enc_N
) = N_Package_Body_Stub
then
9378 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_N
)));
9380 Enclosing_Body
:= Enc_N
;
9383 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
9384 Insert_Freeze_Node_For_Instance
9385 (Enc_G
, Package_Freeze_Node
(Enc_N
));
9389 -- Freeze enclosing subunit before instance
9391 Enc_G_F
:= Package_Freeze_Node
(Enc_G
);
9393 if not Is_List_Member
(Enc_G_F
) then
9394 Insert_After
(Enc_G
, Enc_G_F
);
9397 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9400 -- If none of the above, insert freeze node at the end of the current
9401 -- declarative part.
9403 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9405 end Freeze_Subprogram_Instance
;
9411 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
9413 return Generic_Renamings
.Table
(E
).Gen_Id
;
9416 ---------------------
9417 -- Get_Instance_Of --
9418 ---------------------
9420 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
9421 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
9424 if Res
/= Assoc_Null
then
9425 return Generic_Renamings
.Table
(Res
).Act_Id
;
9428 -- On exit, entity is not instantiated: not a generic parameter, or
9429 -- else parameter of an inner generic unit.
9433 end Get_Instance_Of
;
9435 ---------------------------------
9436 -- Get_Unit_Instantiation_Node --
9437 ---------------------------------
9439 function Get_Unit_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
9440 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
9444 -- If the Package_Instantiation attribute has been set on the package
9445 -- entity, then use it directly when it (or its Original_Node) refers
9446 -- to an N_Package_Instantiation node. In principle it should be
9447 -- possible to have this field set in all cases, which should be
9448 -- investigated, and would allow this function to be significantly
9451 Inst
:= Package_Instantiation
(A
);
9453 if Present
(Inst
) then
9454 if Nkind
(Inst
) = N_Package_Instantiation
then
9457 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
9458 return Original_Node
(Inst
);
9462 -- If the instantiation is a compilation unit that does not need body
9463 -- then the instantiation node has been rewritten as a package
9464 -- declaration for the instance, and we return the original node.
9466 -- If it is a compilation unit and the instance node has not been
9467 -- rewritten, then it is still the unit of the compilation. Finally, if
9468 -- a body is present, this is a parent of the main unit whose body has
9469 -- been compiled for inlining purposes, and the instantiation node has
9470 -- been rewritten with the instance body.
9472 -- Otherwise the instantiation node appears after the declaration. If
9473 -- the entity is a formal package, the declaration may have been
9474 -- rewritten as a generic declaration (in the case of a formal with box)
9475 -- or left as a formal package declaration if it has actuals, and is
9476 -- found with a forward search.
9478 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
9479 if Nkind
(Decl
) = N_Package_Declaration
9480 and then Present
(Corresponding_Body
(Decl
))
9482 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
9485 if Nkind
(Original_Node
(Decl
)) in N_Generic_Instantiation
then
9486 return Original_Node
(Decl
);
9488 return Unit
(Parent
(Decl
));
9491 elsif Nkind
(Decl
) = N_Package_Declaration
9492 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
9494 return Original_Node
(Decl
);
9497 Inst
:= Next
(Decl
);
9498 while Nkind
(Inst
) not in N_Formal_Package_Declaration
9499 | N_Function_Instantiation
9500 | N_Package_Instantiation
9501 | N_Procedure_Instantiation
9508 end Get_Unit_Instantiation_Node
;
9510 ------------------------
9511 -- Has_Been_Exchanged --
9512 ------------------------
9514 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
9518 Next
:= First_Elmt
(Exchanged_Views
);
9519 while Present
(Next
) loop
9520 if Full_View
(Node
(Next
)) = E
then
9528 end Has_Been_Exchanged
;
9534 function Has_Contracts
(Decl
: Node_Id
) return Boolean is
9535 A_List
: constant List_Id
:= Aspect_Specifications
(Decl
);
9542 A_Spec
:= First
(A_List
);
9543 while Present
(A_Spec
) loop
9544 A_Id
:= Get_Aspect_Id
(A_Spec
);
9545 if A_Id
= Aspect_Pre
or else A_Id
= Aspect_Post
then
9560 function Hash
(F
: Entity_Id
) return HTable_Range
is
9562 return HTable_Range
(F
mod HTable_Size
);
9565 ------------------------
9566 -- Hide_Current_Scope --
9567 ------------------------
9569 procedure Hide_Current_Scope
is
9570 C
: constant Entity_Id
:= Current_Scope
;
9574 Set_Is_Hidden_Open_Scope
(C
);
9576 E
:= First_Entity
(C
);
9577 while Present
(E
) loop
9578 if Is_Immediately_Visible
(E
) then
9579 Set_Is_Immediately_Visible
(E
, False);
9580 Append_Elmt
(E
, Hidden_Entities
);
9586 -- Make the scope name invisible as well. This is necessary, but might
9587 -- conflict with calls to Rtsfind later on, in case the scope is a
9588 -- predefined one. There is no clean solution to this problem, so for
9589 -- now we depend on the user not redefining Standard itself in one of
9590 -- the parent units.
9592 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
9593 Set_Is_Immediately_Visible
(C
, False);
9594 Append_Elmt
(C
, Hidden_Entities
);
9597 end Hide_Current_Scope
;
9603 procedure Init_Env
is
9604 Saved
: Instance_Env
;
9607 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
9608 Saved
.Exchanged_Views
:= Exchanged_Views
;
9609 Saved
.Hidden_Entities
:= Hidden_Entities
;
9610 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
9611 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
9612 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
9614 -- Save configuration switches. These may be reset if the unit is a
9615 -- predefined unit, and the current mode is not Ada 2005.
9617 Saved
.Switches
:= Save_Config_Switches
;
9619 Instance_Envs
.Append
(Saved
);
9621 Exchanged_Views
:= New_Elmt_List
;
9622 Hidden_Entities
:= New_Elmt_List
;
9624 -- Make dummy entry for Instantiated parent. If generic unit is legal,
9625 -- this is set properly in Set_Instance_Env.
9627 Current_Instantiated_Parent
:=
9628 (Current_Scope
, Current_Scope
, Assoc_Null
);
9631 ---------------------
9632 -- In_Main_Context --
9633 ---------------------
9635 function In_Main_Context
(E
: Entity_Id
) return Boolean is
9641 if not Is_Compilation_Unit
(E
)
9642 or else Ekind
(E
) /= E_Package
9643 or else In_Private_Part
(E
)
9648 Context
:= Context_Items
(Cunit
(Main_Unit
));
9650 Clause
:= First
(Context
);
9651 while Present
(Clause
) loop
9652 if Nkind
(Clause
) = N_With_Clause
then
9653 Nam
:= Name
(Clause
);
9655 -- If the current scope is part of the context of the main unit,
9656 -- analysis of the corresponding with_clause is not complete, and
9657 -- the entity is not set. We use the Chars field directly, which
9658 -- might produce false positives in rare cases, but guarantees
9659 -- that we produce all the instance bodies we will need.
9661 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
9662 or else (Nkind
(Nam
) = N_Selected_Component
9663 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
9673 end In_Main_Context
;
9675 ---------------------
9676 -- Inherit_Context --
9677 ---------------------
9679 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
9680 Current_Context
: List_Id
;
9681 Current_Unit
: Node_Id
;
9690 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
9692 -- The inherited context is attached to the enclosing compilation
9693 -- unit. This is either the main unit, or the declaration for the
9694 -- main unit (in case the instantiation appears within the package
9695 -- declaration and the main unit is its body).
9697 Current_Unit
:= Parent
(Inst
);
9698 while Present
(Current_Unit
)
9699 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
9701 Current_Unit
:= Parent
(Current_Unit
);
9704 Current_Context
:= Context_Items
(Current_Unit
);
9706 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
9707 while Present
(Item
) loop
9708 if Nkind
(Item
) = N_With_Clause
then
9709 Lib_Unit
:= Library_Unit
(Item
);
9711 -- Take care to prevent direct cyclic with's
9713 if Lib_Unit
/= Current_Unit
then
9715 -- Do not add a unit if it is already in the context
9717 Clause
:= First
(Current_Context
);
9719 while Present
(Clause
) loop
9720 if Nkind
(Clause
) = N_With_Clause
9721 and then Library_Unit
(Clause
) = Lib_Unit
9731 New_I
:= New_Copy
(Item
);
9732 Set_Implicit_With
(New_I
);
9734 Append
(New_I
, Current_Context
);
9742 end Inherit_Context
;
9748 procedure Initialize
is
9750 Generic_Renamings
.Init
;
9753 Generic_Renamings_HTable
.Reset
;
9754 Circularity_Detected
:= False;
9755 Exchanged_Views
:= No_Elist
;
9756 Hidden_Entities
:= No_Elist
;
9759 -------------------------------------
9760 -- Insert_Freeze_Node_For_Instance --
9761 -------------------------------------
9763 procedure Insert_Freeze_Node_For_Instance
9767 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
9768 -- Find enclosing package or subprogram body, if any. Freeze node may
9769 -- be placed at end of current declarative list if previous instance
9770 -- and current one have different enclosing bodies.
9772 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
9773 -- Find the local instance, if any, that declares the generic that is
9774 -- being instantiated. If present, the freeze node for this instance
9775 -- must follow the freeze node for the previous instance.
9777 --------------------
9778 -- Enclosing_Body --
9779 --------------------
9781 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
9787 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9789 if Nkind
(P
) in N_Package_Body | N_Subprogram_Body
then
9790 if Nkind
(Parent
(P
)) = N_Subunit
then
9791 return Corresponding_Stub
(Parent
(P
));
9797 P
:= True_Parent
(P
);
9803 -----------------------
9804 -- Previous_Instance --
9805 -----------------------
9807 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
9812 while Present
(S
) and then S
/= Standard_Standard
loop
9813 if Is_Generic_Instance
(S
)
9814 and then In_Same_Source_Unit
(S
, N
)
9823 end Previous_Instance
;
9834 -- Start of processing for Insert_Freeze_Node_For_Instance
9837 -- Nothing to do if the freeze node has already been inserted
9839 if Is_List_Member
(F_Node
) then
9843 Inst
:= Entity
(F_Node
);
9845 -- When processing a subprogram instantiation, utilize the actual
9846 -- subprogram instantiation rather than its package wrapper as it
9847 -- carries all the context information.
9849 if Is_Wrapper_Package
(Inst
) then
9850 Inst
:= Related_Instance
(Inst
);
9853 Par_Inst
:= Parent
(Inst
);
9855 -- If this is a package instance, check whether the generic is declared
9856 -- in a previous instance and the current instance is not within the
9859 if Present
(Generic_Parent
(Par_Inst
)) and then Is_In_Main_Unit
(N
) then
9861 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
9862 Par_I
: constant Entity_Id
:=
9863 Previous_Instance
(Generic_Parent
(Par_Inst
));
9867 if Present
(Par_I
) and then Earlier
(N
, Freeze_Node
(Par_I
)) then
9868 Scop
:= Scope
(Inst
);
9870 -- If the current instance is within the one that contains
9871 -- the generic, the freeze node for the current one must
9872 -- appear in the current declarative part. Ditto, if the
9873 -- current instance is within another package instance or
9874 -- within a body that does not enclose the current instance.
9875 -- In these three cases the freeze node of the previous
9876 -- instance is not relevant.
9878 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
9879 exit when Scop
= Par_I
9881 (Is_Generic_Instance
(Scop
)
9882 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
9883 Scop
:= Scope
(Scop
);
9886 -- Previous instance encloses current instance
9888 if Scop
= Par_I
then
9891 -- If the next node is a source body we must freeze in the
9892 -- current scope as well.
9894 elsif Present
(Next
(N
))
9895 and then Nkind
(Next
(N
)) in N_Subprogram_Body
9897 and then Comes_From_Source
(Next
(N
))
9901 -- Current instance is within an unrelated instance
9903 elsif Is_Generic_Instance
(Scop
) then
9906 -- Current instance is within an unrelated body
9908 elsif Present
(Enclosing_N
)
9909 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
9914 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
9922 Decls
:= List_Containing
(N
);
9923 Par_N
:= Parent
(Decls
);
9926 -- Determine the proper freeze point of an instantiation
9928 if Is_Generic_Instance
(Inst
) then
9930 -- When the instantiation occurs in a package spec, append the
9931 -- freeze node to the private declarations (if any).
9933 if Nkind
(Par_N
) = N_Package_Specification
9934 and then Decls
= Visible_Declarations
(Par_N
)
9935 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
9937 Decls
:= Private_Declarations
(Par_N
);
9938 Decl
:= First
(Decls
);
9941 -- We adhere to the general rule of a package or subprogram body
9942 -- causing freezing of anything before it in the same declarative
9943 -- region. In this respect, the proper freeze point of a package
9944 -- instantiation is before the first source body which follows, or
9945 -- before a stub. This ensures that entities from the instance are
9946 -- already frozen and therefore usable in source bodies.
9948 if Nkind
(Par_N
) /= N_Package_Declaration
9950 not In_Same_Source_Unit
(Generic_Parent
(Par_Inst
), Inst
)
9952 while Present
(Decl
) loop
9953 if ((Nkind
(Decl
) in N_Unit_Body
9955 Nkind
(Decl
) in N_Body_Stub
)
9956 and then Comes_From_Source
(Decl
))
9957 or else (Present
(Origin
)
9958 and then Nkind
(Decl
) in N_Generic_Instantiation
9959 and then Instance_Spec
(Decl
) /= Origin
)
9961 Set_Sloc
(F_Node
, Sloc
(Decl
));
9962 Insert_Before
(Decl
, F_Node
);
9970 -- When the instantiation occurs in a package spec and there is
9971 -- no source body which follows, and the package has a body but
9972 -- is delayed, then insert immediately before its freeze node.
9974 if Nkind
(Par_N
) = N_Package_Specification
9975 and then Present
(Corresponding_Body
(Parent
(Par_N
)))
9976 and then Present
(Freeze_Node
(Defining_Entity
(Par_N
)))
9978 Set_Sloc
(F_Node
, Sloc
(Freeze_Node
(Defining_Entity
(Par_N
))));
9979 Insert_Before
(Freeze_Node
(Defining_Entity
(Par_N
)), F_Node
);
9982 -- When the instantiation occurs in a package spec and there is
9983 -- no source body which follows, not even of the package itself,
9984 -- then insert into the declaration list of the outer level, but
9985 -- do not jump over following instantiations in this list because
9986 -- they may have a body that has not materialized yet, see above.
9988 elsif Nkind
(Par_N
) = N_Package_Specification
9989 and then No
(Corresponding_Body
(Parent
(Par_N
)))
9990 and then Is_List_Member
(Parent
(Par_N
))
9992 Decl
:= Parent
(Par_N
);
9993 Decls
:= List_Containing
(Decl
);
9994 Par_N
:= Parent
(Decls
);
9997 -- In a package declaration, or if no source body which follows
9998 -- and at library level, then insert at end of list.
10006 -- Insert and adjust the Sloc of the freeze node
10008 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
10009 Insert_After
(Last
(Decls
), F_Node
);
10010 end Insert_Freeze_Node_For_Instance
;
10012 -----------------------------
10013 -- Install_Formal_Packages --
10014 -----------------------------
10016 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
10019 Gen_E
: Entity_Id
:= Empty
;
10022 E
:= First_Entity
(Par
);
10024 -- If we are installing an instance parent, locate the formal packages
10025 -- of its generic parent.
10027 if Is_Generic_Instance
(Par
) then
10028 Gen
:= Generic_Parent
(Package_Specification
(Par
));
10029 Gen_E
:= First_Entity
(Gen
);
10032 while Present
(E
) loop
10033 if Ekind
(E
) = E_Package
10034 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
10036 -- If this is the renaming for the parent instance, done
10038 if Renamed_Entity
(E
) = Par
then
10041 -- The visibility of a formal of an enclosing generic is already
10044 elsif Denotes_Formal_Package
(E
) then
10047 elsif Present
(Associated_Formal_Package
(E
)) then
10048 Check_Generic_Actuals
(Renamed_Entity
(E
), True);
10049 Set_Is_Hidden
(E
, False);
10051 -- Find formal package in generic unit that corresponds to
10052 -- (instance of) formal package in instance.
10054 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
10055 Next_Entity
(Gen_E
);
10058 if Present
(Gen_E
) then
10059 Map_Formal_Package_Entities
(Gen_E
, E
);
10066 if Present
(Gen_E
) then
10067 Next_Entity
(Gen_E
);
10070 end Install_Formal_Packages
;
10072 --------------------
10073 -- Install_Parent --
10074 --------------------
10076 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
10077 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
10078 S
: constant Entity_Id
:= Current_Scope
;
10079 Inst_Par
: Entity_Id
;
10080 First_Par
: Entity_Id
;
10081 Inst_Node
: Node_Id
;
10082 Gen_Par
: Entity_Id
;
10083 First_Gen
: Entity_Id
;
10086 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
10087 -- Install the scopes of noninstance parent units ending with Par
10089 procedure Install_Spec
(Par
: Entity_Id
);
10090 -- The child unit is within the declarative part of the parent, so the
10091 -- declarations within the parent are immediately visible.
10093 -------------------------------
10094 -- Install_Noninstance_Specs --
10095 -------------------------------
10097 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
10100 and then Par
/= Standard_Standard
10101 and then not In_Open_Scopes
(Par
)
10103 Install_Noninstance_Specs
(Scope
(Par
));
10104 Install_Spec
(Par
);
10106 end Install_Noninstance_Specs
;
10112 procedure Install_Spec
(Par
: Entity_Id
) is
10113 Spec
: constant Node_Id
:= Package_Specification
(Par
);
10116 -- If this parent of the child instance is a top-level unit,
10117 -- then record the unit and its visibility for later resetting in
10118 -- Remove_Parent. We exclude units that are generic instances, as we
10119 -- only want to record this information for the ultimate top-level
10120 -- noninstance parent (is that always correct???).
10122 if Scope
(Par
) = Standard_Standard
10123 and then not Is_Generic_Instance
(Par
)
10125 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
10126 Instance_Parent_Unit
:= Par
;
10129 -- Open the parent scope and make it and its declarations visible.
10130 -- If this point is not within a body, then only the visible
10131 -- declarations should be made visible, and installation of the
10132 -- private declarations is deferred until the appropriate point
10133 -- within analysis of the spec being instantiated (see the handling
10134 -- of parent visibility in Analyze_Package_Specification). This is
10135 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
10136 -- private view problems that occur when compiling instantiations of
10137 -- a generic child of that package (Generic_Dispatching_Constructor).
10138 -- If the instance freezes a tagged type, inlinings of operations
10139 -- from Ada.Tags may need the full view of type Tag. If inlining took
10140 -- proper account of establishing visibility of inlined subprograms'
10141 -- parents then it should be possible to remove this
10142 -- special check. ???
10145 Set_Is_Immediately_Visible
(Par
);
10146 Install_Visible_Declarations
(Par
);
10147 Set_Use
(Visible_Declarations
(Spec
));
10149 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
10150 Install_Private_Declarations
(Par
);
10151 Set_Use
(Private_Declarations
(Spec
));
10155 -- Start of processing for Install_Parent
10158 -- We need to install the parent instance to compile the instantiation
10159 -- of the child, but the child instance must appear in the current
10160 -- scope. Given that we cannot place the parent above the current scope
10161 -- in the scope stack, we duplicate the current scope and unstack both
10162 -- after the instantiation is complete.
10164 -- If the parent is itself the instantiation of a child unit, we must
10165 -- also stack the instantiation of its parent, and so on. Each such
10166 -- ancestor is the prefix of the name in a prior instantiation.
10168 -- If this is a nested instance, the parent unit itself resolves to
10169 -- a renaming of the parent instance, whose declaration we need.
10171 -- Finally, the parent may be a generic (not an instance) when the
10172 -- child unit appears as a formal package.
10176 if Present
(Renamed_Entity
(Inst_Par
)) then
10177 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10180 First_Par
:= Inst_Par
;
10182 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10184 First_Gen
:= Gen_Par
;
10186 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
10188 -- Load grandparent instance as well
10190 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
10192 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
10193 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
10195 if Present
(Renamed_Entity
(Inst_Par
)) then
10196 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10199 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10201 if Present
(Gen_Par
) then
10202 Prepend_Elmt
(Inst_Par
, Ancestors
);
10205 -- Parent is not the name of an instantiation
10207 Install_Noninstance_Specs
(Inst_Par
);
10218 if Present
(First_Gen
) then
10219 Append_Elmt
(First_Par
, Ancestors
);
10221 Install_Noninstance_Specs
(First_Par
);
10224 if not Is_Empty_Elmt_List
(Ancestors
) then
10225 Elmt
:= First_Elmt
(Ancestors
);
10226 while Present
(Elmt
) loop
10227 Install_Spec
(Node
(Elmt
));
10228 Install_Formal_Packages
(Node
(Elmt
));
10233 if not In_Body
then
10236 end Install_Parent
;
10238 -------------------------------
10239 -- Install_Hidden_Primitives --
10240 -------------------------------
10242 procedure Install_Hidden_Primitives
10243 (Prims_List
: in out Elist_Id
;
10248 List
: Elist_Id
:= No_Elist
;
10249 Prim_G_Elmt
: Elmt_Id
;
10250 Prim_A_Elmt
: Elmt_Id
;
10255 -- No action needed in case of serious errors because we cannot trust
10256 -- in the order of primitives
10258 if Serious_Errors_Detected
> 0 then
10261 -- No action possible if we don't have available the list of primitive
10265 or else not Is_Record_Type
(Gen_T
)
10266 or else not Is_Tagged_Type
(Gen_T
)
10267 or else not Is_Record_Type
(Act_T
)
10268 or else not Is_Tagged_Type
(Act_T
)
10272 -- There is no need to handle interface types since their primitives
10273 -- cannot be hidden
10275 elsif Is_Interface
(Gen_T
) then
10279 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
10281 if not Is_Class_Wide_Type
(Act_T
) then
10282 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
10284 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
10288 -- Skip predefined primitives in the generic formal
10290 while Present
(Prim_G_Elmt
)
10291 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
10293 Next_Elmt
(Prim_G_Elmt
);
10296 -- Skip predefined primitives in the generic actual
10298 while Present
(Prim_A_Elmt
)
10299 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
10301 Next_Elmt
(Prim_A_Elmt
);
10304 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
10306 Prim_G
:= Node
(Prim_G_Elmt
);
10307 Prim_A
:= Node
(Prim_A_Elmt
);
10309 -- There is no need to handle interface primitives because their
10310 -- primitives are not hidden
10312 exit when Present
(Interface_Alias
(Prim_G
));
10314 -- Here we install one hidden primitive
10316 if Chars
(Prim_G
) /= Chars
(Prim_A
)
10317 and then Has_Suffix
(Prim_A
, 'P')
10318 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
10320 Set_Chars
(Prim_A
, Chars
(Prim_G
));
10321 Append_New_Elmt
(Prim_A
, To
=> List
);
10324 Next_Elmt
(Prim_A_Elmt
);
10325 Next_Elmt
(Prim_G_Elmt
);
10328 -- Append the elements to the list of temporarily visible primitives
10329 -- avoiding duplicates.
10331 if Present
(List
) then
10332 if No
(Prims_List
) then
10333 Prims_List
:= New_Elmt_List
;
10336 Elmt
:= First_Elmt
(List
);
10337 while Present
(Elmt
) loop
10338 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
10342 end Install_Hidden_Primitives
;
10344 -------------------------------
10345 -- Restore_Hidden_Primitives --
10346 -------------------------------
10348 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
10349 Prim_Elmt
: Elmt_Id
;
10353 if Present
(Prims_List
) then
10354 Prim_Elmt
:= First_Elmt
(Prims_List
);
10355 while Present
(Prim_Elmt
) loop
10356 Prim
:= Node
(Prim_Elmt
);
10357 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
10358 Next_Elmt
(Prim_Elmt
);
10361 Prims_List
:= No_Elist
;
10363 end Restore_Hidden_Primitives
;
10365 --------------------------------
10366 -- Instantiate_Formal_Package --
10367 --------------------------------
10369 function Instantiate_Formal_Package
10372 Analyzed_Formal
: Node_Id
) return List_Id
10374 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10375 Hidden_Formals
: constant Elist_Id
:= New_Elmt_List
;
10377 Actual_Pack
: Entity_Id
;
10378 Formal_Pack
: Entity_Id
;
10379 Gen_Parent
: Entity_Id
;
10382 Parent_Spec
: Node_Id
;
10384 procedure Find_Matching_Actual
10386 Act
: in out Entity_Id
);
10387 -- We need to associate each formal entity in the formal package with
10388 -- the corresponding entity in the actual package. The actual package
10389 -- has been analyzed and possibly expanded, and as a result there is
10390 -- no one-to-one correspondence between the two lists (for example,
10391 -- the actual may include subtypes, itypes, and inherited primitive
10392 -- operations, interspersed among the renaming declarations for the
10393 -- actuals). We retrieve the corresponding actual by name because each
10394 -- actual has the same name as the formal, and they do appear in the
10397 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
10398 -- Retrieve entity of defining entity of generic formal parameter.
10399 -- Only the declarations of formals need to be considered when
10400 -- linking them to actuals, but the declarative list may include
10401 -- internal entities generated during analysis, and those are ignored.
10403 procedure Match_Formal_Entity
10404 (Formal_Node
: Node_Id
;
10405 Formal_Ent
: Entity_Id
;
10406 Actual_Ent
: Entity_Id
);
10407 -- Associates the formal entity with the actual. In the case where
10408 -- Formal_Ent is a formal package, this procedure iterates through all
10409 -- of its formals and enters associations between the actuals occurring
10410 -- in the formal package's corresponding actual package (given by
10411 -- Actual_Ent) and the formal package's formal parameters. This
10412 -- procedure recurses if any of the parameters is itself a package.
10414 function Is_Instance_Of
10415 (Act_Spec
: Entity_Id
;
10416 Gen_Anc
: Entity_Id
) return Boolean;
10417 -- The actual can be an instantiation of a generic within another
10418 -- instance, in which case there is no direct link from it to the
10419 -- original generic ancestor. In that case, we recognize that the
10420 -- ultimate ancestor is the same by examining names and scopes.
10422 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
10423 -- If the current formal is declared with a box, its own formals are
10424 -- visible in the instance, as they were in the generic, and their
10425 -- Hidden flag must be reset. If some of these formals are themselves
10426 -- packages declared with a box, the processing must be recursive.
10428 --------------------------
10429 -- Find_Matching_Actual --
10430 --------------------------
10432 procedure Find_Matching_Actual
10434 Act
: in out Entity_Id
)
10436 Formal_Ent
: Entity_Id
;
10439 case Nkind
(Original_Node
(F
)) is
10440 when N_Formal_Object_Declaration
10441 | N_Formal_Type_Declaration
10443 Formal_Ent
:= Defining_Identifier
(F
);
10445 while Present
(Act
)
10446 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10451 when N_Formal_Package_Declaration
10452 | N_Formal_Subprogram_Declaration
10453 | N_Generic_Package_Declaration
10454 | N_Package_Declaration
10456 Formal_Ent
:= Defining_Entity
(F
);
10458 while Present
(Act
)
10459 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10465 raise Program_Error
;
10467 end Find_Matching_Actual
;
10469 -------------------------
10470 -- Match_Formal_Entity --
10471 -------------------------
10473 procedure Match_Formal_Entity
10474 (Formal_Node
: Node_Id
;
10475 Formal_Ent
: Entity_Id
;
10476 Actual_Ent
: Entity_Id
)
10478 Act_Pkg
: Entity_Id
;
10481 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
10483 if Ekind
(Actual_Ent
) = E_Package
then
10485 -- Record associations for each parameter
10487 Act_Pkg
:= Actual_Ent
;
10490 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
10494 Gen_Decl
: Node_Id
;
10496 Actual
: Entity_Id
;
10499 -- Retrieve the actual given in the formal package declaration
10501 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
10503 -- The actual in the formal package declaration may be a
10504 -- renamed generic package, in which case we want to retrieve
10505 -- the original generic in order to traverse its formal part.
10507 if Present
(Renamed_Entity
(Actual
)) then
10508 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
10510 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
10513 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
10515 if Present
(Formals
) then
10516 F_Node
:= First_Non_Pragma
(Formals
);
10521 while Present
(A_Ent
)
10522 and then Present
(F_Node
)
10523 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
10525 F_Ent
:= Get_Formal_Entity
(F_Node
);
10527 if Present
(F_Ent
) then
10529 -- This is a formal of the original package. Record
10530 -- association and recurse.
10532 Find_Matching_Actual
(F_Node
, A_Ent
);
10533 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
10534 Next_Entity
(A_Ent
);
10537 Next_Non_Pragma
(F_Node
);
10541 end Match_Formal_Entity
;
10543 -----------------------
10544 -- Get_Formal_Entity --
10545 -----------------------
10547 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
10548 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
10551 when N_Formal_Object_Declaration
=>
10552 return Defining_Identifier
(N
);
10554 when N_Formal_Type_Declaration
=>
10555 return Defining_Identifier
(N
);
10557 when N_Formal_Subprogram_Declaration
=>
10558 return Defining_Unit_Name
(Specification
(N
));
10560 when N_Formal_Package_Declaration
=>
10561 return Defining_Identifier
(Original_Node
(N
));
10563 when N_Generic_Package_Declaration
=>
10564 return Defining_Identifier
(Original_Node
(N
));
10566 -- All other declarations are introduced by semantic analysis and
10567 -- have no match in the actual.
10572 end Get_Formal_Entity
;
10574 --------------------
10575 -- Is_Instance_Of --
10576 --------------------
10578 function Is_Instance_Of
10579 (Act_Spec
: Entity_Id
;
10580 Gen_Anc
: Entity_Id
) return Boolean
10582 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
10585 if No
(Gen_Par
) then
10588 -- Simplest case: the generic parent of the actual is the formal
10590 elsif Gen_Par
= Gen_Anc
then
10593 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
10596 -- The actual may be obtained through several instantiations. Its
10597 -- scope must itself be an instance of a generic declared in the
10598 -- same scope as the formal. Any other case is detected above.
10600 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
10604 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
10606 end Is_Instance_Of
;
10608 ---------------------------
10609 -- Process_Nested_Formal --
10610 ---------------------------
10612 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
10616 if Present
(Associated_Formal_Package
(Formal
))
10617 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
10619 Ent
:= First_Entity
(Formal
);
10620 while Present
(Ent
) loop
10621 Set_Is_Hidden
(Ent
, False);
10622 Set_Is_Visible_Formal
(Ent
);
10623 Set_Is_Potentially_Use_Visible
10624 (Ent
, Is_Potentially_Use_Visible
(Formal
));
10626 if Ekind
(Ent
) = E_Package
then
10627 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10628 Process_Nested_Formal
(Ent
);
10634 end Process_Nested_Formal
;
10636 -- Start of processing for Instantiate_Formal_Package
10641 -- The actual must be a package instance, or else a current instance
10642 -- such as a parent generic within the body of a generic child.
10644 if not Is_Entity_Name
(Actual
)
10645 or else not Is_Package_Or_Generic_Package
(Entity
(Actual
))
10648 ("expect package instance to instantiate formal", Actual
);
10649 Abandon_Instantiation
(Actual
);
10652 Actual_Pack
:= Entity
(Actual
);
10653 Set_Is_Instantiated
(Actual_Pack
);
10655 -- The actual may be a renamed package, or an outer generic formal
10656 -- package whose instantiation is converted into a renaming.
10658 if Present
(Renamed_Entity
(Actual_Pack
)) then
10659 Actual_Pack
:= Renamed_Entity
(Actual_Pack
);
10662 -- The analyzed formal is expected to be the result of the rewriting
10663 -- of the formal package into a regular package by analysis.
10665 pragma Assert
(Nkind
(Analyzed_Formal
) = N_Package_Declaration
10666 and then Nkind
(Original_Node
(Analyzed_Formal
)) =
10667 N_Formal_Package_Declaration
);
10669 Gen_Parent
:= Generic_Parent
(Specification
(Analyzed_Formal
));
10670 Formal_Pack
:= Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10672 -- The actual for a ghost generic formal package should be a ghost
10673 -- package (SPARK RM 6.9(14)).
10675 Check_Ghost_Formal_Procedure_Or_Package
10677 Actual
=> Actual_Pack
,
10678 Formal
=> Formal_Pack
);
10680 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
10681 Parent_Spec
:= Package_Specification
(Actual_Pack
);
10683 Parent_Spec
:= Parent
(Actual_Pack
);
10686 if Gen_Parent
= Any_Id
then
10688 ("previous error in declaration of formal package", Actual
);
10689 Abandon_Instantiation
(Actual
);
10691 elsif Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
)) then
10694 -- If this is the current instance of an enclosing generic, that unit
10695 -- is the generic package we need.
10697 elsif In_Open_Scopes
(Actual_Pack
)
10698 and then Ekind
(Actual_Pack
) = E_Generic_Package
10704 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
10705 Abandon_Instantiation
(Actual
);
10708 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
10709 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
10712 Make_Package_Renaming_Declaration
(Loc
,
10713 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
10714 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
10716 Set_Associated_Formal_Package
10717 (Defining_Unit_Name
(Nod
), Defining_Identifier
(Formal
));
10718 Decls
:= New_List
(Nod
);
10720 -- If the formal F has a box, then the generic declarations are
10721 -- visible in the generic G. In an instance of G, the corresponding
10722 -- entities in the actual for F (which are the actuals for the
10723 -- instantiation of the generic that F denotes) must also be made
10724 -- visible for analysis of the current instance. On exit from the
10725 -- current instance, those entities are made private again. If the
10726 -- actual is currently in use, these entities are also use-visible.
10728 -- The loop through the actual entities also steps through the formal
10729 -- entities and enters associations from formals to actuals into the
10730 -- renaming map. This is necessary to properly handle checking of
10731 -- actual parameter associations for later formals that depend on
10732 -- actuals declared in the formal package.
10734 -- In Ada 2005, partial parameterization requires that we make
10735 -- visible the actuals corresponding to formals that were defaulted
10736 -- in the formal package. There formals are identified because they
10737 -- remain formal generics within the formal package, rather than
10738 -- being renamings of the actuals supplied.
10741 Gen_Decl
: constant Node_Id
:=
10742 Unit_Declaration_Node
(Gen_Parent
);
10743 Formals
: constant List_Id
:=
10744 Generic_Formal_Declarations
(Gen_Decl
);
10746 Actual_Ent
: Entity_Id
;
10747 Actual_Of_Formal
: Node_Id
;
10748 Formal_Node
: Node_Id
;
10749 Formal_Ent
: Entity_Id
;
10752 if Present
(Formals
) then
10753 Formal_Node
:= First_Non_Pragma
(Formals
);
10755 Formal_Node
:= Empty
;
10758 Actual_Ent
:= First_Entity
(Actual_Pack
);
10759 Actual_Of_Formal
:=
10760 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
10761 while Present
(Actual_Ent
)
10762 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10764 if Present
(Formal_Node
) then
10765 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
10767 if Present
(Formal_Ent
) then
10768 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
10769 Match_Formal_Entity
(Formal_Node
, Formal_Ent
, Actual_Ent
);
10771 -- We iterate at the same time over the actuals of the
10772 -- local package created for the formal, to determine
10773 -- which one of the formals of the original generic were
10774 -- defaulted in the formal. The corresponding actual
10775 -- entities are visible in the enclosing instance.
10777 if Box_Present
(Formal
)
10779 (Present
(Actual_Of_Formal
)
10782 (Get_Formal_Entity
(Actual_Of_Formal
)))
10784 Set_Is_Hidden
(Actual_Ent
, False);
10785 Set_Is_Visible_Formal
(Actual_Ent
);
10786 Set_Is_Potentially_Use_Visible
10787 (Actual_Ent
, In_Use
(Actual_Pack
));
10789 if Ekind
(Actual_Ent
) = E_Package
then
10790 Process_Nested_Formal
(Actual_Ent
);
10794 if not Is_Hidden
(Actual_Ent
) then
10795 Append_Elmt
(Actual_Ent
, Hidden_Formals
);
10798 Set_Is_Hidden
(Actual_Ent
);
10799 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
10803 Next_Non_Pragma
(Formal_Node
);
10804 Next
(Actual_Of_Formal
);
10806 -- A formal subprogram may be overloaded, so advance in
10807 -- the list of actuals to make sure we do not match two
10808 -- successive formals to the same actual. This is only
10809 -- relevant for overloadable entities, others have
10812 if Is_Overloadable
(Actual_Ent
) then
10813 Next_Entity
(Actual_Ent
);
10817 -- No further formals to match, but the generic part may
10818 -- contain inherited operation that are not hidden in the
10819 -- enclosing instance.
10821 Next_Entity
(Actual_Ent
);
10825 -- Inherited subprograms generated by formal derived types are
10826 -- also visible if the types are.
10828 Actual_Ent
:= First_Entity
(Actual_Pack
);
10829 while Present
(Actual_Ent
)
10830 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10832 if Is_Overloadable
(Actual_Ent
)
10834 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
10836 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
10838 Set_Is_Hidden
(Actual_Ent
, False);
10839 Set_Is_Potentially_Use_Visible
10840 (Actual_Ent
, In_Use
(Actual_Pack
));
10843 Next_Entity
(Actual_Ent
);
10847 -- If the formal requires conformance checking, reanalyze it as an
10848 -- abbreviated instantiation, to verify the matching rules of 12.7.
10849 -- The actual checks are performed after the generic associations
10850 -- have been analyzed, to guarantee the same visibility for this
10851 -- instantiation and for the actuals.
10853 -- In Ada 2005, the generic associations for the formal can include
10854 -- defaulted parameters. These are ignored during check. This
10855 -- internal instantiation is removed from the tree after conformance
10856 -- checking, because it contains formal declarations for those
10857 -- defaulted parameters, and those should not reach the back-end.
10859 if Requires_Conformance_Checking
(Formal
) then
10861 I_Pack
: constant Entity_Id
:= Make_Temporary
(Loc
, 'P');
10866 Set_Is_Internal
(I_Pack
);
10867 Mutate_Ekind
(I_Pack
, E_Package
);
10869 -- Insert the package into the list of its hidden entities so
10870 -- that the list is not empty for Is_Abbreviated_Instance.
10872 Append_Elmt
(I_Pack
, Hidden_Formals
);
10874 Set_Hidden_In_Formal_Instance
(I_Pack
, Hidden_Formals
);
10876 -- If the generic is a child unit, Check_Generic_Child_Unit
10877 -- needs its original name in case it is qualified.
10879 if Is_Child_Unit
(Gen_Parent
) then
10881 New_Copy_Tree
(Name
(Original_Node
(Analyzed_Formal
)));
10882 pragma Assert
(Entity
(I_Nam
) = Gen_Parent
);
10886 New_Occurrence_Of
(Get_Instance_Of
(Gen_Parent
), Loc
);
10890 Make_Package_Instantiation
(Loc
,
10891 Defining_Unit_Name
=> I_Pack
,
10893 Generic_Associations
=> Generic_Associations
(Formal
)));
10899 end Instantiate_Formal_Package
;
10901 -----------------------------------
10902 -- Instantiate_Formal_Subprogram --
10903 -----------------------------------
10905 function Instantiate_Formal_Subprogram
10908 Analyzed_Formal
: Node_Id
) return Node_Id
10910 Analyzed_S
: constant Entity_Id
:=
10911 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10912 Formal_Sub
: constant Entity_Id
:=
10913 Defining_Unit_Name
(Specification
(Formal
));
10915 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
10916 -- If the generic is a child unit, the parent has been installed on the
10917 -- scope stack, but a default subprogram cannot resolve to something
10918 -- on the parent because that parent is not really part of the visible
10919 -- context (it is there to resolve explicit local entities). If the
10920 -- default has resolved in this way, we remove the entity from immediate
10921 -- visibility and analyze the node again to emit an error message or
10922 -- find another visible candidate.
10924 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
10925 -- Perform legality check and raise exception on failure
10927 -----------------------
10928 -- From_Parent_Scope --
10929 -----------------------
10931 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
10932 Gen_Scope
: Node_Id
;
10935 Gen_Scope
:= Scope
(Analyzed_S
);
10936 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
10937 if Scope
(Subp
) = Scope
(Gen_Scope
) then
10941 Gen_Scope
:= Scope
(Gen_Scope
);
10945 end From_Parent_Scope
;
10947 -----------------------------
10948 -- Valid_Actual_Subprogram --
10949 -----------------------------
10951 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
10955 if Is_Entity_Name
(Act
) then
10956 Act_E
:= Entity
(Act
);
10958 elsif Nkind
(Act
) = N_Selected_Component
10959 and then Is_Entity_Name
(Selector_Name
(Act
))
10961 Act_E
:= Entity
(Selector_Name
(Act
));
10967 -- The actual for a ghost generic formal procedure should be a ghost
10968 -- procedure (SPARK RM 6.9(14)).
10971 and then Ekind
(Act_E
) = E_Procedure
10973 Check_Ghost_Formal_Procedure_Or_Package
10976 Formal
=> Analyzed_S
);
10979 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
10980 or else Nkind
(Act
) in N_Attribute_Reference
10981 | N_Indexed_Component
10982 | N_Character_Literal
10983 | N_Explicit_Dereference
10989 ("expect subprogram or entry name in instantiation of &",
10990 Instantiation_Node
, Formal_Sub
);
10991 Abandon_Instantiation
(Instantiation_Node
);
10992 end Valid_Actual_Subprogram
;
10996 Decl_Node
: Node_Id
;
10999 New_Spec
: Node_Id
;
11000 New_Subp
: Entity_Id
;
11002 -- Start of processing for Instantiate_Formal_Subprogram
11005 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
11007 -- The tree copy has created the proper instantiation sloc for the
11008 -- new specification. Use this location for all other constructed
11011 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
11013 -- Create new entity for the actual (New_Copy_Tree does not), and
11014 -- indicate that it is an actual.
11016 -- If the actual is not an entity (i.e. an attribute reference)
11017 -- and the formal includes aspect specifications for contracts,
11018 -- we create an internal name for the renaming declaration. The
11019 -- constructed wrapper contains a call to the entity in the renaming.
11020 -- This is an expansion activity, as is the wrapper creation.
11022 if Ada_Version
>= Ada_2022
11023 and then Has_Contracts
(Analyzed_Formal
)
11024 and then not Is_Entity_Name
(Actual
)
11025 and then Expander_Active
11027 New_Subp
:= Make_Temporary
(Sloc
(Actual
), 'S');
11029 New_Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
));
11032 Mutate_Ekind
(New_Subp
, Ekind
(Analyzed_S
));
11033 Set_Is_Generic_Actual_Subprogram
(New_Subp
);
11034 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
11036 -- Create new entities for the each of the formals in the specification
11037 -- of the renaming declaration built for the actual.
11039 if Present
(Parameter_Specifications
(New_Spec
)) then
11045 F
:= First
(Parameter_Specifications
(New_Spec
));
11046 while Present
(F
) loop
11047 F_Id
:= Defining_Identifier
(F
);
11049 Set_Defining_Identifier
(F
,
11050 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
11056 -- Find entity of actual. If the actual is an attribute reference, it
11057 -- cannot be resolved here (its formal is missing) but is handled
11058 -- instead in Attribute_Renaming. If the actual is overloaded, it is
11059 -- fully resolved subsequently, when the renaming declaration for the
11060 -- formal is analyzed. If it is an explicit dereference, resolve the
11061 -- prefix but not the actual itself, to prevent interpretation as call.
11063 if Present
(Actual
) then
11064 Loc
:= Sloc
(Actual
);
11065 Set_Sloc
(New_Spec
, Loc
);
11067 if Nkind
(Actual
) = N_Operator_Symbol
then
11068 Find_Direct_Name
(Actual
);
11070 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
11071 Analyze
(Prefix
(Actual
));
11073 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
11077 Valid_Actual_Subprogram
(Actual
);
11080 elsif Present
(Default_Name
(Formal
)) then
11081 if Nkind
(Default_Name
(Formal
)) not in N_Attribute_Reference
11082 | N_Selected_Component
11083 | N_Indexed_Component
11084 | N_Character_Literal
11085 and then Present
(Entity
(Default_Name
(Formal
)))
11087 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
11089 Nam
:= New_Copy
(Default_Name
(Formal
));
11090 Set_Sloc
(Nam
, Loc
);
11093 elsif Box_Present
(Formal
) then
11095 -- Actual is resolved at the point of instantiation. Create an
11096 -- identifier or operator with the same name as the formal.
11098 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
11100 Make_Operator_Symbol
(Loc
,
11101 Chars
=> Chars
(Formal_Sub
),
11102 Strval
=> No_String
);
11104 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
11107 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
11108 and then Null_Present
(Specification
(Formal
))
11110 -- Generate null body for procedure, for use in the instance
11113 Make_Subprogram_Body
(Loc
,
11114 Specification
=> New_Spec
,
11115 Declarations
=> New_List
,
11116 Handled_Statement_Sequence
=>
11117 Make_Handled_Sequence_Of_Statements
(Loc
,
11118 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
11120 -- RM 12.6 (16.2/2): The procedure has convention Intrinsic
11122 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11124 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11126 -- Eliminate the calls to it when optimization is enabled
11128 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11131 -- Handle case of a formal function with an expression default (allowed
11132 -- when extensions are enabled).
11134 elsif Nkind
(Specification
(Formal
)) = N_Function_Specification
11135 and then Present
(Expression
(Formal
))
11137 -- Generate body for function, for use in the instance
11140 Expr
: constant Node_Id
:= New_Copy
(Expression
(Formal
));
11141 Stmt
: constant Node_Id
:= Make_Simple_Return_Statement
(Loc
);
11143 Set_Sloc
(Expr
, Loc
);
11144 Set_Expression
(Stmt
, Expr
);
11147 Make_Subprogram_Body
(Loc
,
11148 Specification
=> New_Spec
,
11149 Declarations
=> New_List
,
11150 Handled_Statement_Sequence
=>
11151 Make_Handled_Sequence_Of_Statements
(Loc
,
11152 Statements
=> New_List
(Stmt
)));
11155 -- RM 12.6 (16.2/2): Like a null procedure default, the function
11156 -- has convention Intrinsic.
11158 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11160 -- Inline calls to it when optimization is enabled
11162 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11166 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
11168 ("missing actual&", Instantiation_Node
, Formal_Sub
);
11170 ("\in instantiation of & declared#",
11171 Instantiation_Node
, Scope
(Analyzed_S
));
11172 Abandon_Instantiation
(Instantiation_Node
);
11176 Make_Subprogram_Renaming_Declaration
(Loc
,
11177 Specification
=> New_Spec
,
11180 -- If we do not have an actual and the formal specified <> then set to
11181 -- get proper default.
11183 if No
(Actual
) and then Box_Present
(Formal
) then
11184 Set_From_Default
(Decl_Node
);
11187 -- Gather possible interpretations for the actual before analyzing the
11188 -- instance. If overloaded, it will be resolved when analyzing the
11189 -- renaming declaration.
11191 if Box_Present
(Formal
) and then No
(Actual
) then
11194 if Is_Child_Unit
(Scope
(Analyzed_S
))
11195 and then Present
(Entity
(Nam
))
11197 if not Is_Overloaded
(Nam
) then
11198 if From_Parent_Scope
(Entity
(Nam
)) then
11199 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
11200 Set_Entity
(Nam
, Empty
);
11201 Set_Etype
(Nam
, Empty
);
11204 Set_Is_Immediately_Visible
(Entity
(Nam
));
11213 Get_First_Interp
(Nam
, I
, It
);
11214 while Present
(It
.Nam
) loop
11215 if From_Parent_Scope
(It
.Nam
) then
11219 Get_Next_Interp
(I
, It
);
11226 -- The generic instantiation freezes the actual. This can only be done
11227 -- once the actual is resolved, in the analysis of the renaming
11228 -- declaration. To make the formal subprogram entity available, we set
11229 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
11230 -- This is also needed in Analyze_Subprogram_Renaming for the processing
11231 -- of formal abstract subprograms.
11233 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
11235 -- We cannot analyze the renaming declaration, and thus find the actual,
11236 -- until all the actuals are assembled in the instance. For subsequent
11237 -- checks of other actuals, indicate the node that will hold the
11238 -- instance of this formal.
11240 Set_Instance_Of
(Analyzed_S
, Nam
);
11242 if Nkind
(Actual
) = N_Selected_Component
11243 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
11244 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
11246 -- The renaming declaration will create a body, which must appear
11247 -- outside of the instantiation, We move the renaming declaration
11248 -- out of the instance, and create an additional renaming inside,
11249 -- to prevent freezing anomalies.
11252 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
11255 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
11256 Insert_Before
(Instantiation_Node
, Decl_Node
);
11257 Analyze
(Decl_Node
);
11259 -- Now create renaming within the instance
11262 Make_Subprogram_Renaming_Declaration
(Loc
,
11263 Specification
=> New_Copy_Tree
(New_Spec
),
11264 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
11266 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
11267 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
11272 end Instantiate_Formal_Subprogram
;
11274 ------------------------
11275 -- Instantiate_Object --
11276 ------------------------
11278 function Instantiate_Object
11281 Analyzed_Formal
: Node_Id
) return List_Id
11283 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11284 A_Gen_Obj
: constant Entity_Id
:=
11285 Defining_Identifier
(Analyzed_Formal
);
11286 Acc_Def
: Node_Id
:= Empty
;
11287 Act_Assoc
: constant Node_Id
:=
11288 (if No
(Actual
) then Empty
else Parent
(Actual
));
11289 Actual_Decl
: Node_Id
:= Empty
;
11290 Decl_Node
: Node_Id
;
11293 List
: constant List_Id
:= New_List
;
11294 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
11295 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11296 Subt_Decl
: Node_Id
:= Empty
;
11297 Subt_Mark
: Node_Id
:= Empty
;
11299 -- Start of processing for Instantiate_Object
11302 -- Formal may be an anonymous access
11304 if Present
(Subtype_Mark
(Formal
)) then
11305 Subt_Mark
:= Subtype_Mark
(Formal
);
11307 Check_Access_Definition
(Formal
);
11308 Acc_Def
:= Access_Definition
(Formal
);
11311 -- Sloc for error message on missing actual
11313 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
11315 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
11316 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
11319 Set_Parent
(List
, Act_Assoc
);
11323 if Out_Present
(Formal
) then
11325 -- An IN OUT generic actual must be a name. The instantiation is a
11326 -- renaming declaration. The actual is the name being renamed. We
11327 -- use the actual directly, rather than a copy, because it is not
11328 -- used further in the list of actuals, and because a copy or a use
11329 -- of relocate_node is incorrect if the instance is nested within a
11330 -- generic. In order to simplify e.g. ASIS queries, the
11331 -- Generic_Parent field links the declaration to the generic
11334 if No
(Actual
) then
11336 ("missing actual &",
11337 Instantiation_Node
, Gen_Obj
);
11339 ("\in instantiation of & declared#",
11340 Instantiation_Node
, Scope
(A_Gen_Obj
));
11341 Abandon_Instantiation
(Instantiation_Node
);
11344 if Present
(Subt_Mark
) then
11346 Make_Object_Renaming_Declaration
(Loc
,
11347 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11348 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
11351 else pragma Assert
(Present
(Acc_Def
));
11353 Make_Object_Renaming_Declaration
(Loc
,
11354 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11355 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
11359 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11361 -- The analysis of the actual may produce Insert_Action nodes, so
11362 -- the declaration must have a context in which to attach them.
11364 Append
(Decl_Node
, List
);
11367 -- Return if the analysis of the actual reported some error
11369 if Etype
(Actual
) = Any_Type
then
11373 -- This check is performed here because Analyze_Object_Renaming will
11374 -- not check it when Comes_From_Source is False. Note though that the
11375 -- check for the actual being the name of an object will be performed
11376 -- in Analyze_Object_Renaming.
11378 if Is_Object_Reference
(Actual
)
11379 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
11382 ("illegal discriminant-dependent component for in out parameter",
11386 -- The actual has to be resolved in order to check that it is a
11387 -- variable (due to cases such as F (1), where F returns access to
11388 -- an array, and for overloaded prefixes).
11390 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
11392 -- If the type of the formal is not itself a formal, and the current
11393 -- unit is a child unit, the formal type must be declared in a
11394 -- parent, and must be retrieved by visibility.
11396 if Ftyp
= Orig_Ftyp
11397 and then Is_Generic_Unit
(Scope
(Ftyp
))
11398 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
11401 Temp
: constant Node_Id
:=
11402 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
11404 Set_Entity
(Temp
, Empty
);
11406 Ftyp
:= Entity
(Temp
);
11410 if Is_Private_Type
(Ftyp
)
11411 and then not Is_Private_Type
(Etype
(Actual
))
11412 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
11413 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
11415 -- If the actual has the type of the full view of the formal, or
11416 -- else a non-private subtype of the formal, then the visibility
11417 -- of the formal type has changed. Add to the actuals a subtype
11418 -- declaration that will force the exchange of views in the body
11419 -- of the instance as well.
11422 Make_Subtype_Declaration
(Loc
,
11423 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
11424 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
11426 Prepend
(Subt_Decl
, List
);
11428 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
11429 Exchange_Declarations
(Ftyp
);
11432 Resolve
(Actual
, Ftyp
);
11434 if not Denotes_Variable
(Actual
) then
11435 Error_Msg_NE
("actual for& must be a variable", Actual
, Gen_Obj
);
11437 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
11439 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
11440 -- the type of the actual shall resolve to a specific anonymous
11443 if Ada_Version
< Ada_2005
11444 or else not Is_Anonymous_Access_Type
(Base_Type
(Ftyp
))
11445 or else not Is_Anonymous_Access_Type
(Base_Type
(Etype
(Actual
)))
11448 ("type of actual does not match type of&", Actual
, Gen_Obj
);
11452 Note_Possible_Modification
(Actual
, Sure
=> True);
11454 -- Check for instantiation with atomic/volatile/VFA object actual for
11455 -- nonatomic/nonvolatile/nonVFA formal (RM C.6 (12)).
11457 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
11459 ("cannot instantiate nonatomic formal & of mode in out",
11461 Error_Msg_N
("\with atomic object actual (RM C.6(12))", Actual
);
11463 elsif Is_Volatile_Object_Ref
(Actual
)
11464 and then not Is_Volatile
(Orig_Ftyp
)
11467 ("cannot instantiate nonvolatile formal & of mode in out",
11469 Error_Msg_N
("\with volatile object actual (RM C.6(12))", Actual
);
11471 elsif Is_Volatile_Full_Access_Object_Ref
(Actual
)
11472 and then not Is_Volatile_Full_Access
(Orig_Ftyp
)
11475 ("cannot instantiate nonfull access formal & of mode in out",
11478 ("\with full access object actual (RM C.6(12))", Actual
);
11481 -- Check for instantiation on nonatomic subcomponent of a full access
11482 -- object in Ada 2022 (RM C.6 (12)).
11484 if Ada_Version
>= Ada_2022
11485 and then Is_Subcomponent_Of_Full_Access_Object
(Actual
)
11486 and then not Is_Atomic_Object
(Actual
)
11489 ("cannot instantiate formal & of mode in out with actual",
11492 ("\nonatomic subcomponent of full access object (RM C.6(12))",
11496 -- Check actual/formal compatibility with respect to the four
11497 -- volatility refinement aspects.
11500 Actual_Obj
: constant Entity_Id
:=
11501 Get_Enclosing_Deep_Object
(Actual
);
11503 Check_Volatility_Compatibility
11504 (Actual_Obj
, A_Gen_Obj
, "actual object",
11505 "its corresponding formal object of mode in out",
11506 Srcpos_Bearer
=> Actual
);
11509 -- The actual for a ghost generic formal IN OUT parameter should be a
11510 -- ghost object (SPARK RM 6.9(14)).
11512 Check_Ghost_Formal_Variable
11514 Formal
=> A_Gen_Obj
);
11516 -- Formal in-parameter
11519 -- The instantiation of a generic formal in-parameter is constant
11520 -- declaration. The actual is the expression for that declaration.
11521 -- Its type is a full copy of the type of the formal. This may be
11522 -- an access to subprogram, for which we need to generate entities
11523 -- for the formals in the new signature.
11525 if Present
(Actual
) then
11526 if Present
(Subt_Mark
) then
11527 Def
:= New_Copy_Tree
(Subt_Mark
);
11529 pragma Assert
(Present
(Acc_Def
));
11530 Def
:= New_Copy_Tree
(Acc_Def
);
11534 Make_Object_Declaration
(Loc
,
11535 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11536 Constant_Present
=> True,
11537 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11538 Object_Definition
=> Def
,
11539 Expression
=> Actual
);
11541 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11542 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11544 -- A generic formal object of a tagged type is defined to be
11545 -- aliased so the new constant must also be treated as aliased.
11547 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
11548 Set_Aliased_Present
(Decl_Node
);
11551 Append
(Decl_Node
, List
);
11553 -- The actual for a ghost generic formal IN parameter of
11554 -- access-to-variable type should be a ghost object (SPARK
11557 if Is_Access_Variable
(Etype
(A_Gen_Obj
)) then
11558 Check_Ghost_Formal_Variable
11560 Formal
=> A_Gen_Obj
);
11563 -- No need to repeat (pre-)analysis of some expression nodes
11564 -- already handled in Preanalyze_Actuals.
11566 if Nkind
(Actual
) /= N_Allocator
then
11569 -- Return if the analysis of the actual reported some error
11571 if Etype
(Actual
) = Any_Type
then
11577 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11581 Typ
:= Get_Instance_Of
(Formal_Type
);
11583 -- If the actual appears in the current or an enclosing scope,
11584 -- use its type directly. This is relevant if it has an actual
11585 -- subtype that is distinct from its nominal one. This cannot
11586 -- be done in general because the type of the actual may
11587 -- depend on other actuals, and only be fully determined when
11588 -- the enclosing instance is analyzed.
11590 if Present
(Etype
(Actual
))
11591 and then Is_Constr_Subt_For_U_Nominal
(Etype
(Actual
))
11593 Freeze_Before
(Instantiation_Node
, Etype
(Actual
));
11595 Freeze_Before
(Instantiation_Node
, Typ
);
11598 -- If the actual is an aggregate, perform name resolution on
11599 -- its components (the analysis of an aggregate does not do it)
11600 -- to capture local names that may be hidden if the generic is
11603 if Nkind
(Actual
) = N_Aggregate
then
11604 Preanalyze_And_Resolve
(Actual
, Typ
);
11607 if Is_Limited_Type
(Typ
)
11608 and then not OK_For_Limited_Init
(Typ
, Actual
)
11611 ("initialization not allowed for limited types", Actual
);
11612 Explain_Limited_Type
(Typ
, Actual
);
11616 elsif Present
(Default_Expression
(Formal
)) then
11618 -- Use default to construct declaration
11620 if Present
(Subt_Mark
) then
11621 Def
:= New_Copy_Tree
(Subt_Mark
);
11623 pragma Assert
(Present
(Acc_Def
));
11624 Def
:= New_Copy_Tree
(Acc_Def
);
11628 Make_Object_Declaration
(Sloc
(Formal
),
11629 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11630 Constant_Present
=> True,
11631 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11632 Object_Definition
=> Def
,
11633 Expression
=> New_Copy_Tree
11634 (Default_Expression
(Formal
)));
11636 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
11637 Set_Corresponding_Generic_Association
11638 (Decl_Node
, Expression
(Decl_Node
));
11640 Append
(Decl_Node
, List
);
11641 Set_Analyzed
(Expression
(Decl_Node
), False);
11644 Error_Msg_NE
("missing actual&", Instantiation_Node
, Gen_Obj
);
11645 Error_Msg_NE
("\in instantiation of & declared#",
11646 Instantiation_Node
, Scope
(A_Gen_Obj
));
11648 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
11650 -- Create dummy constant declaration so that instance can be
11651 -- analyzed, to minimize cascaded visibility errors.
11653 if Present
(Subt_Mark
) then
11655 else pragma Assert
(Present
(Acc_Def
));
11660 Make_Object_Declaration
(Loc
,
11661 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11662 Constant_Present
=> True,
11663 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11664 Object_Definition
=> New_Copy
(Def
),
11666 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
11667 Attribute_Name
=> Name_First
,
11668 Prefix
=> New_Copy
(Def
)));
11670 Append
(Decl_Node
, List
);
11673 Abandon_Instantiation
(Instantiation_Node
);
11678 if Nkind
(Actual
) in N_Has_Entity
11679 and then Present
(Entity
(Actual
))
11681 Actual_Decl
:= Parent
(Entity
(Actual
));
11684 -- Ada 2005 (AI-423) refined by AI12-0287:
11685 -- For an object_renaming_declaration with a null_exclusion or an
11686 -- access_definition that has a null_exclusion, the subtype of the
11687 -- object_name shall exclude null. In addition, if the
11688 -- object_renaming_declaration occurs within the body of a generic unit
11689 -- G or within the body of a generic unit declared within the
11690 -- declarative region of generic unit G, then:
11691 -- * if the object_name statically denotes a generic formal object of
11692 -- mode in out of G, then the declaration of that object shall have a
11694 -- * if the object_name statically denotes a call of a generic formal
11695 -- function of G, then the declaration of the result of that function
11696 -- shall have a null_exclusion.
11698 if Ada_Version
>= Ada_2005
11699 and then Present
(Actual_Decl
)
11700 and then Nkind
(Actual_Decl
) in N_Formal_Object_Declaration
11701 | N_Object_Declaration
11702 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
11703 and then not Has_Null_Exclusion
(Actual_Decl
)
11704 and then Has_Null_Exclusion
(Analyzed_Formal
)
11705 and then Ekind
(Defining_Identifier
(Analyzed_Formal
))
11706 = E_Generic_In_Out_Parameter
11707 and then ((In_Generic_Scope
(Entity
(Actual
))
11708 and then In_Package_Body
(Scope
(Entity
(Actual
))))
11709 or else not Can_Never_Be_Null
(Etype
(Actual
)))
11711 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
11713 ("actual must exclude null to match generic formal#", Actual
);
11716 -- An effectively volatile object cannot be used as an actual in a
11717 -- generic instantiation (SPARK RM 7.1.3(7)). The following check is
11718 -- relevant only when SPARK_Mode is on as it is not a standard Ada
11719 -- legality rule, and also verifies that the actual is an object.
11722 and then Present
(Actual
)
11723 and then Is_Object_Reference
(Actual
)
11724 and then Is_Effectively_Volatile_Object
(Actual
)
11725 and then not Is_Effectively_Volatile
(A_Gen_Obj
)
11728 ("volatile object cannot act as actual in generic instantiation",
11733 end Instantiate_Object
;
11735 ------------------------------
11736 -- Instantiate_Package_Body --
11737 ------------------------------
11739 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11740 -- must be replaced by gotos which jump to the end of the routine in order
11741 -- to restore the Ghost and SPARK modes.
11743 procedure Instantiate_Package_Body
11744 (Body_Info
: Pending_Body_Info
;
11745 Inlined_Body
: Boolean := False;
11746 Body_Optional
: Boolean := False)
11748 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11749 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11750 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
11751 Ctx_Parents
: Elist_Id
:= No_Elist
;
11752 Ctx_Top
: Int
:= 0;
11753 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11754 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11755 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11756 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11757 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11759 procedure Check_Initialized_Types
;
11760 -- In a generic package body, an entity of a generic private type may
11761 -- appear uninitialized. This is suspicious, unless the actual is a
11762 -- fully initialized type.
11764 procedure Install_Parents_Of_Generic_Context
11765 (Inst_Scope
: Entity_Id
;
11766 Ctx_Parents
: out Elist_Id
);
11767 -- Inst_Scope is the scope where the instance appears within; when it
11768 -- appears within a generic child package G, this routine collects and
11769 -- installs the enclosing packages of G in the scopes stack; installed
11770 -- packages are returned in Ctx_Parents.
11772 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
);
11773 -- Reverse effect after instantiation is complete
11775 -----------------------------
11776 -- Check_Initialized_Types --
11777 -----------------------------
11779 procedure Check_Initialized_Types
is
11781 Formal
: Entity_Id
;
11782 Actual
: Entity_Id
;
11783 Uninit_Var
: Entity_Id
;
11786 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
11787 while Present
(Decl
) loop
11788 Uninit_Var
:= Empty
;
11790 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
11791 Uninit_Var
:= Uninitialized_Variable
(Decl
);
11793 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
11794 and then Nkind
(Formal_Type_Definition
(Decl
)) =
11795 N_Formal_Private_Type_Definition
11798 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
11801 if Present
(Uninit_Var
) then
11802 Formal
:= Defining_Identifier
(Decl
);
11803 Actual
:= First_Entity
(Act_Decl_Id
);
11805 -- For each formal there is a subtype declaration that renames
11806 -- the actual and has the same name as the formal. Locate the
11807 -- formal for warning message about uninitialized variables
11808 -- in the generic, for which the actual type should be a fully
11809 -- initialized type.
11811 while Present
(Actual
) loop
11812 exit when Ekind
(Actual
) = E_Package
11813 and then Present
(Renamed_Entity
(Actual
));
11815 if Chars
(Actual
) = Chars
(Formal
)
11816 and then not Is_Scalar_Type
(Actual
)
11817 and then not Is_Fully_Initialized_Type
(Actual
)
11818 and then Warn_On_No_Value_Assigned
11820 Error_Msg_Node_2
:= Formal
;
11822 ("generic unit has uninitialized variable& of "
11823 & "formal private type &?v?", Actual
, Uninit_Var
);
11825 ("actual type for& should be fully initialized type?v?",
11830 Next_Entity
(Actual
);
11836 end Check_Initialized_Types
;
11838 ----------------------------------------
11839 -- Install_Parents_Of_Generic_Context --
11840 ----------------------------------------
11842 procedure Install_Parents_Of_Generic_Context
11843 (Inst_Scope
: Entity_Id
;
11844 Ctx_Parents
: out Elist_Id
)
11850 Ctx_Parents
:= New_Elmt_List
;
11852 -- Collect context parents (ie. parents where the instantiation
11853 -- appears within).
11856 while S
/= Standard_Standard
loop
11857 Prepend_Elmt
(S
, Ctx_Parents
);
11861 -- Install enclosing parents
11863 Elmt
:= First_Elmt
(Ctx_Parents
);
11864 while Present
(Elmt
) loop
11865 Push_Scope
(Node
(Elmt
));
11866 Set_Is_Immediately_Visible
(Node
(Elmt
));
11869 end Install_Parents_Of_Generic_Context
;
11871 ---------------------------------------
11872 -- Remove_Parents_Of_Generic_Context --
11873 ---------------------------------------
11875 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
) is
11879 -- Traverse Ctx_Parents in LIFO order to check the removed scopes
11881 Elmt
:= Last_Elmt
(Ctx_Parents
);
11882 while Present
(Elmt
) loop
11883 pragma Assert
(Current_Scope
= Node
(Elmt
));
11884 Set_Is_Immediately_Visible
(Current_Scope
, False);
11887 Remove_Last_Elmt
(Ctx_Parents
);
11888 Elmt
:= Last_Elmt
(Ctx_Parents
);
11890 end Remove_Parents_Of_Generic_Context
;
11894 -- The following constants capture the context prior to instantiating
11895 -- the package body.
11897 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
11898 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11899 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
11900 Saved_ISMP
: constant Boolean :=
11901 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11902 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
11903 Local_Suppress_Stack_Top
;
11904 Saved_SC
: constant Boolean := Style_Check
;
11905 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11906 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11907 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
11908 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
11910 Act_Body
: Node_Id
;
11911 Act_Body_Id
: Entity_Id
;
11912 Act_Body_Name
: Node_Id
;
11913 Gen_Body
: Node_Id
;
11914 Gen_Body_Id
: Node_Id
;
11915 Par_Ent
: Entity_Id
:= Empty
;
11916 Par_Installed
: Boolean := False;
11917 Par_Vis
: Boolean := False;
11919 Scope_Check_Id
: Entity_Id
;
11920 Scope_Check_Last
: Nat
;
11921 -- Value of Current_Scope before calls to Install_Parents; used to check
11922 -- that scopes are correctly removed after instantiation.
11924 Vis_Prims_List
: Elist_Id
:= No_Elist
;
11925 -- List of primitives made temporarily visible in the instantiation
11926 -- to match the visibility of the formal type.
11928 -- Start of processing for Instantiate_Package_Body
11931 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11933 -- The instance body may already have been processed, as the parent of
11934 -- another instance that is inlined (Load_Parent_Of_Generic).
11936 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
11940 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11942 -- Re-establish the state of information on which checks are suppressed.
11943 -- This information was set in Body_Info at the point of instantiation,
11944 -- and now we restore it so that the instance is compiled using the
11945 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11947 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
11948 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
11950 Restore_Config_Switches
(Body_Info
.Config_Switches
);
11951 Restore_Warnings
(Body_Info
.Warnings
);
11953 if No
(Gen_Body_Id
) then
11955 -- Do not look for parent of generic body if none is required.
11956 -- This may happen when the routine is called as part of the
11957 -- Pending_Instantiations processing, when nested instances
11958 -- may precede the one generated from the main unit.
11960 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
11961 and then Body_Optional
11965 Load_Parent_Of_Generic
11966 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
11968 -- Surprisingly enough, loading the body of the parent can cause
11969 -- the body to be instantiated and the double instantiation needs
11970 -- to be prevented in order to avoid giving bogus semantic errors.
11972 -- This case can occur because of the Collect_Previous_Instances
11973 -- machinery of Load_Parent_Of_Generic, which will instantiate
11974 -- bodies that are deemed to be ahead of the body of the parent
11975 -- in the compilation unit. But the relative position of these
11976 -- bodies is computed using the mere comparison of their Sloc.
11978 -- Now suppose that you have two generic packages G and H, with
11979 -- G containing a mere instantiation of H:
11985 -- package Nested_G is
11996 -- package My_H is new H;
12000 -- and a third package Q instantiating G and Nested_G:
12006 -- package My_G is new G;
12008 -- package My_Nested_G is new My_G.My_H.Nested_G;
12012 -- The body to be instantiated is that of My_Nested_G and its
12013 -- parent is the instance My_G.My_H. This latter instantiation
12014 -- is done when My_G is analyzed, i.e. after the declarations
12015 -- of My_G and My_Nested_G have been parsed; as a result, the
12016 -- Sloc of My_G.My_H is greater than the Sloc of My_Nested_G.
12018 -- Therefore loading the body of My_G.My_H will cause the body
12019 -- of My_Nested_G to be instantiated because it is deemed to be
12020 -- ahead of My_G.My_H. This means that Load_Parent_Of_Generic
12021 -- will again be invoked on My_G.My_H, but this time with the
12022 -- Collect_Previous_Instances machinery disabled, so there is
12023 -- no endless mutual recursion and things are done in order.
12025 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12029 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12033 -- Establish global variable for sloc adjustment and for error recovery
12034 -- In the case of an instance body for an instantiation with actuals
12035 -- from a limited view, the instance body is placed at the beginning
12036 -- of the enclosing package body: use the body entity as the source
12037 -- location for nodes of the instance body.
12039 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
)) then
12041 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12042 Body_Id
: constant Node_Id
:=
12043 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12046 Instantiation_Node
:= Body_Id
;
12049 Instantiation_Node
:= Inst_Node
;
12052 -- The package being instantiated may be subject to pragma Ghost. Set
12053 -- the mode now to ensure that any nodes generated during instantiation
12054 -- are properly marked as Ghost.
12056 Set_Ghost_Mode
(Act_Decl_Id
);
12058 if Present
(Gen_Body_Id
) then
12059 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12060 Style_Check
:= False;
12062 -- If the context of the instance is subject to SPARK_Mode "off", the
12063 -- annotation is missing, or the body is instantiated at a later pass
12064 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12065 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12068 if SPARK_Mode
/= On
12069 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12071 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12074 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12075 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12077 Create_Instantiation_Source
12078 (Inst_Node
, Gen_Body_Id
, S_Adjustment
);
12082 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12084 -- Create proper (possibly qualified) defining name for the body, to
12085 -- correspond to the one in the spec.
12088 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12089 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12091 -- Some attributes of spec entity are not inherited by body entity
12093 Set_Handler_Records
(Act_Body_Id
, No_List
);
12095 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12096 N_Defining_Program_Unit_Name
12099 Make_Defining_Program_Unit_Name
(Loc
,
12101 New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
12102 Defining_Identifier
=> Act_Body_Id
);
12104 Act_Body_Name
:= Act_Body_Id
;
12107 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
12109 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12110 Check_Generic_Actuals
(Act_Decl_Id
, False);
12111 Check_Initialized_Types
;
12113 -- Install primitives hidden at the point of the instantiation but
12114 -- visible when processing the generic formals
12120 E
:= First_Entity
(Act_Decl_Id
);
12121 while Present
(E
) loop
12123 and then not Is_Itype
(E
)
12124 and then Is_Generic_Actual_Type
(E
)
12125 and then Is_Tagged_Type
(E
)
12127 Install_Hidden_Primitives
12128 (Prims_List
=> Vis_Prims_List
,
12129 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
12137 Scope_Check_Id
:= Current_Scope
;
12138 Scope_Check_Last
:= Scope_Stack
.Last
;
12140 -- If the instantiation appears within a generic child some actual
12141 -- parameter may be the current instance of the enclosing generic
12145 Inst_Scope
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12148 if Is_Child_Unit
(Inst_Scope
)
12149 and then Ekind
(Inst_Scope
) = E_Generic_Package
12150 and then Present
(Generic_Associations
(Inst_Node
))
12152 Install_Parents_Of_Generic_Context
(Inst_Scope
, Ctx_Parents
);
12154 -- Hide them from visibility; required to avoid conflicts
12155 -- installing the parent instance.
12157 if Present
(Ctx_Parents
) then
12158 Push_Scope
(Standard_Standard
);
12159 Ctx_Top
:= Scope_Stack
.Last
;
12160 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12165 -- If it is a child unit, make the parent instance (which is an
12166 -- instance of the parent of the generic) visible.
12168 -- 1) The child unit's parent is an explicit parent instance (the
12169 -- prefix of the name of the generic unit):
12171 -- package Child_Package is new Parent_Instance.Child_Unit;
12173 -- 2) The child unit's parent is an implicit parent instance (e.g.
12174 -- when instantiating a sibling package):
12177 -- package Parent.Second_Child is
12181 -- package Parent.First_Child is
12182 -- package Sibling_Package is new Second_Child;
12184 -- 3) The child unit's parent is not an instance, so the scope is
12185 -- simply the one of the unit.
12187 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12188 and then Nkind
(Gen_Id
) = N_Expanded_Name
12190 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12192 elsif Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12193 and then Ekind
(Scope
(Act_Decl_Id
)) = E_Package
12194 and then Is_Generic_Instance
(Scope
(Act_Decl_Id
))
12196 (Name
(Get_Unit_Instantiation_Node
12197 (Scope
(Act_Decl_Id
)))) = N_Expanded_Name
12200 (Prefix
(Name
(Get_Unit_Instantiation_Node
12201 (Scope
(Act_Decl_Id
)))));
12203 elsif Is_Child_Unit
(Gen_Unit
) then
12204 Par_Ent
:= Scope
(Gen_Unit
);
12207 if Present
(Par_Ent
) then
12208 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12209 Install_Parent
(Par_Ent
, In_Body
=> True);
12210 Par_Installed
:= True;
12213 -- If the instantiation is a library unit, and this is the main unit,
12214 -- then build the resulting compilation unit nodes for the instance.
12215 -- If this is a compilation unit but it is not the main unit, then it
12216 -- is the body of a unit in the context, that is being compiled
12217 -- because it is encloses some inlined unit or another generic unit
12218 -- being instantiated. In that case, this body is not part of the
12219 -- current compilation, and is not attached to the tree, but its
12220 -- parent must be set for analysis.
12222 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12224 -- Replace instance node with body of instance, and create new
12225 -- node for corresponding instance declaration.
12227 Build_Instance_Compilation_Unit_Nodes
12228 (Inst_Node
, Act_Body
, Act_Decl
);
12230 -- If the instantiation appears within a generic child package
12231 -- enable visibility of current instance of enclosing generic
12234 if Present
(Ctx_Parents
) then
12235 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12236 Analyze
(Inst_Node
);
12237 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12239 Analyze
(Inst_Node
);
12242 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12244 -- If the instance is a child unit itself, then set the scope
12245 -- of the expanded body to be the parent of the instantiation
12246 -- (ensuring that the fully qualified name will be generated
12247 -- for the elaboration subprogram).
12249 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12250 N_Defining_Program_Unit_Name
12252 Set_Scope
(Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
12256 -- Case where instantiation is not a library unit
12259 -- Handle the case of an instance with incomplete actual types.
12260 -- The instance body cannot be placed just after the declaration
12261 -- because full views have not been seen yet. Any use of the non-
12262 -- limited views in the instance body requires the presence of a
12263 -- regular with_clause in the enclosing unit. Therefore we place
12264 -- the instance body at the beginning of the enclosing body, and
12265 -- the freeze node for the instance is then placed after the body.
12267 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
))
12268 and then Ekind
(Scope
(Act_Decl_Id
)) = E_Package
12271 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12272 Body_Id
: constant Node_Id
:=
12273 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12278 pragma Assert
(Present
(Body_Id
));
12280 Prepend
(Act_Body
, Declarations
(Parent
(Body_Id
)));
12282 if Expander_Active
then
12283 Ensure_Freeze_Node
(Act_Decl_Id
);
12284 F_Node
:= Freeze_Node
(Act_Decl_Id
);
12285 Set_Is_Frozen
(Act_Decl_Id
, False);
12286 if Is_List_Member
(F_Node
) then
12290 Insert_After
(Act_Body
, F_Node
);
12295 Insert_Before
(Inst_Node
, Act_Body
);
12296 Mark_Rewrite_Insertion
(Act_Body
);
12298 -- Insert the freeze node for the instance if need be
12300 if Expander_Active
then
12301 Freeze_Package_Instance
12302 (Inst_Node
, Gen_Body
, Gen_Decl
, Act_Decl_Id
);
12303 Set_Is_Frozen
(Act_Decl_Id
);
12307 -- If the instantiation appears within a generic child package
12308 -- enable visibility of current instance of enclosing generic
12311 if Present
(Ctx_Parents
) then
12312 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12313 Analyze
(Act_Body
);
12314 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12316 Analyze
(Act_Body
);
12320 Inherit_Context
(Gen_Body
, Inst_Node
);
12322 if Par_Installed
then
12323 Remove_Parent
(In_Body
=> True);
12325 -- Restore the previous visibility of the parent
12327 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12330 -- Remove the parent instances if they have been placed on the scope
12331 -- stack to compile the body.
12333 if Present
(Ctx_Parents
) then
12334 pragma Assert
(Scope_Stack
.Last
= Ctx_Top
12335 and then Current_Scope
= Standard_Standard
);
12338 Remove_Parents_Of_Generic_Context
(Ctx_Parents
);
12341 pragma Assert
(Current_Scope
= Scope_Check_Id
);
12342 pragma Assert
(Scope_Stack
.Last
= Scope_Check_Last
);
12344 Restore_Hidden_Primitives
(Vis_Prims_List
);
12346 -- Restore the private views that were made visible when the body of
12347 -- the instantiation was created. Note that, in the case where one of
12348 -- these private views is declared in the parent, there is a nesting
12349 -- issue with the calls to Install_Parent and Remove_Parent made in
12350 -- between above with In_Body set to True, because these calls also
12351 -- want to swap and restore this private view respectively. In this
12352 -- case, the call to Install_Parent does nothing, but the call to
12353 -- Remove_Parent does restore the private view, thus undercutting the
12354 -- call to Restore_Private_Views. That's OK under the condition that
12355 -- the two mechanisms swap exactly the same entities, in particular
12356 -- the private entities dependent on the primary private entities.
12358 Restore_Private_Views
(Act_Decl_Id
);
12360 -- Remove the current unit from visibility if this is an instance
12361 -- that is not elaborated on the fly for inlining purposes.
12363 if not Inlined_Body
then
12364 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
12369 -- If we have no body, and the unit requires a body, then complain. This
12370 -- complaint is suppressed if we have detected other errors (since a
12371 -- common reason for missing the body is that it had errors).
12372 -- In CodePeer mode, a warning has been emitted already, no need for
12373 -- further messages.
12375 elsif Unit_Requires_Body
(Gen_Unit
)
12376 and then not Body_Optional
12378 if CodePeer_Mode
then
12381 elsif Serious_Errors_Detected
= 0 then
12383 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
12385 -- Don't attempt to perform any cleanup actions if some other error
12386 -- was already detected, since this can cause blowups.
12392 -- Case of package that does not need a body
12395 -- If the instantiation of the declaration is a library unit, rewrite
12396 -- the original package instantiation as a package declaration in the
12397 -- compilation unit node.
12399 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12400 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
12401 Rewrite
(Inst_Node
, Act_Decl
);
12403 -- Generate elaboration entity, in case spec has elaboration code.
12404 -- This cannot be done when the instance is analyzed, because it
12405 -- is not known yet whether the body exists.
12407 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
12408 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
12410 -- If the instantiation is not a library unit, then append the
12411 -- declaration to the list of implicitly generated entities, unless
12412 -- it is already a list member which means that it was already
12415 elsif not Is_List_Member
(Act_Decl
) then
12416 Mark_Rewrite_Insertion
(Act_Decl
);
12417 Insert_Before
(Inst_Node
, Act_Decl
);
12423 -- Restore the context that was in effect prior to instantiating the
12426 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12427 Local_Suppress_Stack_Top
:= Saved_LSST
;
12428 Scope_Suppress
:= Saved_SS
;
12429 Style_Check
:= Saved_SC
;
12431 Expander_Mode_Restore
;
12432 Restore_Config_Switches
(Saved_CS
);
12433 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12434 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12435 Restore_Warnings
(Saved_Warn
);
12436 end Instantiate_Package_Body
;
12438 ---------------------------------
12439 -- Instantiate_Subprogram_Body --
12440 ---------------------------------
12442 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
12443 -- must be replaced by gotos which jump to the end of the routine in order
12444 -- to restore the Ghost and SPARK modes.
12446 procedure Instantiate_Subprogram_Body
12447 (Body_Info
: Pending_Body_Info
;
12448 Body_Optional
: Boolean := False)
12450 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
12451 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
12452 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
12453 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
12454 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
12455 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
12456 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
12457 Pack_Id
: constant Entity_Id
:=
12458 Defining_Unit_Name
(Parent
(Act_Decl
));
12460 -- The following constants capture the context prior to instantiating
12461 -- the subprogram body.
12463 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
12464 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
12465 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
12466 Saved_ISMP
: constant Boolean :=
12467 Ignore_SPARK_Mode_Pragmas_In_Instance
;
12468 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
12469 Local_Suppress_Stack_Top
;
12470 Saved_SC
: constant Boolean := Style_Check
;
12471 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
12472 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
12473 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
12474 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
12476 Act_Body
: Node_Id
;
12477 Act_Body_Id
: Entity_Id
;
12478 Gen_Body
: Node_Id
;
12479 Gen_Body_Id
: Node_Id
;
12480 Pack_Body
: Node_Id
;
12481 Par_Ent
: Entity_Id
:= Empty
;
12482 Par_Installed
: Boolean := False;
12483 Par_Vis
: Boolean := False;
12484 Ret_Expr
: Node_Id
;
12487 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12489 -- Subprogram body may have been created already because of an inline
12490 -- pragma, or because of multiple elaborations of the enclosing package
12491 -- when several instances of the subprogram appear in the main unit.
12493 if Present
(Corresponding_Body
(Act_Decl
)) then
12497 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
12499 -- Re-establish the state of information on which checks are suppressed.
12500 -- This information was set in Body_Info at the point of instantiation,
12501 -- and now we restore it so that the instance is compiled using the
12502 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
12504 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
12505 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
12507 Restore_Config_Switches
(Body_Info
.Config_Switches
);
12508 Restore_Warnings
(Body_Info
.Warnings
);
12510 if No
(Gen_Body_Id
) then
12512 -- For imported generic subprogram, no body to compile, complete
12513 -- the spec entity appropriately.
12515 if Is_Imported
(Gen_Unit
) then
12516 Set_Is_Imported
(Act_Decl_Id
);
12517 Set_First_Rep_Item
(Act_Decl_Id
, First_Rep_Item
(Gen_Unit
));
12518 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
12519 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
12520 Set_Has_Completion
(Act_Decl_Id
);
12523 -- For other cases, compile the body
12526 Load_Parent_Of_Generic
12527 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
12528 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12532 Instantiation_Node
:= Inst_Node
;
12534 -- The subprogram being instantiated may be subject to pragma Ghost. Set
12535 -- the mode now to ensure that any nodes generated during instantiation
12536 -- are properly marked as Ghost.
12538 Set_Ghost_Mode
(Act_Decl_Id
);
12540 if Present
(Gen_Body_Id
) then
12541 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12543 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
12545 -- Either body is not present, or context is non-expanding, as
12546 -- when compiling a subunit. Mark the instance as completed, and
12547 -- diagnose a missing body when needed.
12550 and then Operating_Mode
= Generate_Code
12552 Error_Msg_N
("missing proper body for instantiation", Gen_Body
);
12555 Set_Has_Completion
(Act_Decl_Id
);
12559 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12560 Style_Check
:= False;
12562 -- If the context of the instance is subject to SPARK_Mode "off", the
12563 -- annotation is missing, or the body is instantiated at a later pass
12564 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12565 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12568 if SPARK_Mode
/= On
12569 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12571 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12574 -- If the context of an instance is not subject to SPARK_Mode "off",
12575 -- and the generic body is subject to an explicit SPARK_Mode pragma,
12576 -- the latter should be the one applicable to the instance.
12578 if not Ignore_SPARK_Mode_Pragmas_In_Instance
12579 and then SPARK_Mode
/= Off
12580 and then Present
(SPARK_Pragma
(Gen_Body_Id
))
12582 Set_SPARK_Mode
(Gen_Body_Id
);
12585 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12586 Create_Instantiation_Source
12593 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12595 -- Create proper defining name for the body, to correspond to the one
12599 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12601 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12602 Set_Defining_Unit_Name
(Specification
(Act_Body
), Act_Body_Id
);
12604 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12605 Set_Has_Completion
(Act_Decl_Id
);
12606 Check_Generic_Actuals
(Pack_Id
, False);
12608 -- Generate a reference to link the visible subprogram instance to
12609 -- the generic body, which for navigation purposes is the only
12610 -- available source for the instance.
12613 (Related_Instance
(Pack_Id
),
12614 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
12616 -- If it is a child unit, make the parent instance (which is an
12617 -- instance of the parent of the generic) visible. The parent
12618 -- instance is the prefix of the name of the generic unit.
12620 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12621 and then Nkind
(Gen_Id
) = N_Expanded_Name
12623 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12624 elsif Is_Child_Unit
(Gen_Unit
) then
12625 Par_Ent
:= Scope
(Gen_Unit
);
12628 if Present
(Par_Ent
) then
12629 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12630 Install_Parent
(Par_Ent
, In_Body
=> True);
12631 Par_Installed
:= True;
12634 -- Subprogram body is placed in the body of wrapper package,
12635 -- whose spec contains the subprogram declaration as well as
12636 -- the renaming declarations for the generic parameters.
12639 Make_Package_Body
(Loc
,
12640 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12641 Declarations
=> New_List
(Act_Body
));
12643 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12645 -- If the instantiation is a library unit, then build resulting
12646 -- compilation unit nodes for the instance. The declaration of
12647 -- the enclosing package is the grandparent of the subprogram
12648 -- declaration. First replace the instantiation node as the unit
12649 -- of the corresponding compilation.
12651 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12652 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12653 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
12654 Build_Instance_Compilation_Unit_Nodes
12655 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
12656 Analyze
(Inst_Node
);
12658 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
12659 Analyze
(Pack_Body
);
12663 Insert_Before
(Inst_Node
, Pack_Body
);
12664 Mark_Rewrite_Insertion
(Pack_Body
);
12666 -- Insert the freeze node for the instance if need be
12668 if Expander_Active
then
12669 Freeze_Subprogram_Instance
(Inst_Node
, Gen_Body
, Pack_Id
);
12672 Analyze
(Pack_Body
);
12675 Inherit_Context
(Gen_Body
, Inst_Node
);
12677 Restore_Private_Views
(Pack_Id
, False);
12679 if Par_Installed
then
12680 Remove_Parent
(In_Body
=> True);
12682 -- Restore the previous visibility of the parent
12684 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12689 -- Body not found. Error was emitted already. If there were no previous
12690 -- errors, this may be an instance whose scope is a premature instance.
12691 -- In that case we must insure that the (legal) program does raise
12692 -- program error if executed. We generate a subprogram body for this
12695 elsif Serious_Errors_Detected
= 0
12696 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
12698 if Body_Optional
then
12701 elsif Ekind
(Act_Decl_Id
) = E_Procedure
then
12703 Make_Subprogram_Body
(Loc
,
12705 Make_Procedure_Specification
(Loc
,
12706 Defining_Unit_Name
=>
12707 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12708 Parameter_Specifications
=>
12710 (Parameter_Specifications
(Parent
(Act_Decl_Id
)))),
12712 Declarations
=> Empty_List
,
12713 Handled_Statement_Sequence
=>
12714 Make_Handled_Sequence_Of_Statements
(Loc
,
12715 Statements
=> New_List
(
12716 Make_Raise_Program_Error
(Loc
,
12717 Reason
=> PE_Access_Before_Elaboration
))));
12721 Make_Raise_Program_Error
(Loc
,
12722 Reason
=> PE_Access_Before_Elaboration
);
12724 Set_Etype
(Ret_Expr
, (Etype
(Act_Decl_Id
)));
12725 Set_Analyzed
(Ret_Expr
);
12728 Make_Subprogram_Body
(Loc
,
12730 Make_Function_Specification
(Loc
,
12731 Defining_Unit_Name
=>
12732 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12733 Parameter_Specifications
=>
12735 (Parameter_Specifications
(Parent
(Act_Decl_Id
))),
12736 Result_Definition
=>
12737 New_Occurrence_Of
(Etype
(Act_Decl_Id
), Loc
)),
12739 Declarations
=> Empty_List
,
12740 Handled_Statement_Sequence
=>
12741 Make_Handled_Sequence_Of_Statements
(Loc
,
12742 Statements
=> New_List
(
12743 Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
12747 Make_Package_Body
(Loc
,
12748 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12749 Declarations
=> New_List
(Act_Body
));
12751 Insert_After
(Inst_Node
, Pack_Body
);
12752 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12753 Analyze
(Pack_Body
);
12758 -- Restore the context that was in effect prior to instantiating the
12759 -- subprogram body.
12761 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12762 Local_Suppress_Stack_Top
:= Saved_LSST
;
12763 Scope_Suppress
:= Saved_SS
;
12764 Style_Check
:= Saved_SC
;
12766 Expander_Mode_Restore
;
12767 Restore_Config_Switches
(Saved_CS
);
12768 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12769 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12770 Restore_Warnings
(Saved_Warn
);
12771 end Instantiate_Subprogram_Body
;
12773 ----------------------
12774 -- Instantiate_Type --
12775 ----------------------
12777 function Instantiate_Type
12780 Analyzed_Formal
: Node_Id
;
12781 Actual_Decls
: List_Id
) return List_Id
12783 A_Gen_T
: constant Entity_Id
:=
12784 Defining_Identifier
(Analyzed_Formal
);
12785 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
12786 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
12788 Ancestor
: Entity_Id
:= Empty
;
12789 Decl_Node
: Node_Id
;
12790 Decl_Nodes
: List_Id
;
12794 procedure Check_Shared_Variable_Control_Aspects
;
12795 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12796 -- that may be specified for a formal type are obeyed by the actual.
12798 procedure Diagnose_Predicated_Actual
;
12799 -- There are a number of constructs in which a discrete type with
12800 -- predicates is illegal, e.g. as an index in an array type declaration.
12801 -- If a generic type is used is such a construct in a generic package
12802 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
12803 -- of the generic contract that the actual cannot have predicates.
12805 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
12806 -- Check that base types are the same and that the subtypes match
12807 -- statically. Used in several of the validation subprograms for
12808 -- actuals in instantiations.
12810 procedure Validate_Array_Type_Instance
;
12811 procedure Validate_Access_Subprogram_Instance
;
12812 procedure Validate_Access_Type_Instance
;
12813 procedure Validate_Derived_Type_Instance
;
12814 procedure Validate_Derived_Interface_Type_Instance
;
12815 procedure Validate_Discriminated_Formal_Type
;
12816 procedure Validate_Interface_Type_Instance
;
12817 procedure Validate_Private_Type_Instance
;
12818 procedure Validate_Incomplete_Type_Instance
;
12819 -- These procedures perform validation tests for the named case.
12820 -- Validate_Discriminated_Formal_Type is shared by formal private
12821 -- types and Ada 2012 formal incomplete types.
12823 --------------------------------------------
12824 -- Check_Shared_Variable_Control_Aspects --
12825 --------------------------------------------
12827 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12828 -- that may be specified for the formal are obeyed by the actual.
12829 -- If the formal is a derived type the aspect specifications must match.
12830 -- NOTE: AI12-0282 implies that matching of aspects is required between
12831 -- formal and actual in all cases, but this is too restrictive.
12832 -- In particular it violates a language design rule: a limited private
12833 -- indefinite formal can be matched by any actual. The current code
12834 -- reflects an older and more permissive version of RM C.6 (12/5).
12836 procedure Check_Shared_Variable_Control_Aspects
is
12838 if Ada_Version
>= Ada_2022
then
12839 if Is_Atomic
(A_Gen_T
) and then not Is_Atomic
(Act_T
) then
12841 ("actual for& must have Atomic aspect", Actual
, A_Gen_T
);
12843 elsif Is_Derived_Type
(A_Gen_T
)
12844 and then Is_Atomic
(A_Gen_T
) /= Is_Atomic
(Act_T
)
12847 ("actual for& has different Atomic aspect", Actual
, A_Gen_T
);
12850 if Is_Volatile
(A_Gen_T
) and then not Is_Volatile
(Act_T
) then
12852 ("actual for& must have Volatile aspect",
12855 elsif Is_Derived_Type
(A_Gen_T
)
12856 and then Is_Volatile
(A_Gen_T
) /= Is_Volatile
(Act_T
)
12859 ("actual for& has different Volatile aspect",
12863 -- We assume that an array type whose atomic component type
12864 -- is Atomic is equivalent to an array type with the explicit
12865 -- aspect Has_Atomic_Components. This is a reasonable inference
12866 -- from the intent of AI12-0282, and makes it legal to use an
12867 -- actual that does not have the identical aspect as the formal.
12868 -- Ditto for volatile components.
12871 Actual_Atomic_Comp
: constant Boolean :=
12872 Has_Atomic_Components
(Act_T
)
12873 or else (Is_Array_Type
(Act_T
)
12874 and then Is_Atomic
(Component_Type
(Act_T
)));
12876 if Has_Atomic_Components
(A_Gen_T
) /= Actual_Atomic_Comp
then
12878 ("formal and actual for& must agree on atomic components",
12884 Actual_Volatile_Comp
: constant Boolean :=
12885 Has_Volatile_Components
(Act_T
)
12886 or else (Is_Array_Type
(Act_T
)
12887 and then Is_Volatile
(Component_Type
(Act_T
)));
12889 if Has_Volatile_Components
(A_Gen_T
) /= Actual_Volatile_Comp
12892 ("actual for& must have volatile components",
12897 -- The following two aspects do not require exact matching,
12898 -- but only one-way agreement. See RM C.6.
12900 if Is_Independent
(A_Gen_T
) and then not Is_Independent
(Act_T
)
12903 ("actual for& must have Independent aspect specified",
12907 if Has_Independent_Components
(A_Gen_T
)
12908 and then not Has_Independent_Components
(Act_T
)
12911 ("actual for& must have Independent_Components specified",
12915 -- Check actual/formal compatibility with respect to the four
12916 -- volatility refinement aspects.
12918 Check_Volatility_Compatibility
12920 "actual type", "its corresponding formal type",
12921 Srcpos_Bearer
=> Actual
);
12923 end Check_Shared_Variable_Control_Aspects
;
12925 ---------------------------------
12926 -- Diagnose_Predicated_Actual --
12927 ---------------------------------
12929 procedure Diagnose_Predicated_Actual
is
12931 if No_Predicate_On_Actual
(A_Gen_T
)
12932 and then Has_Predicates
(Act_T
)
12935 ("actual for& cannot be a type with predicate",
12936 Instantiation_Node
, A_Gen_T
);
12938 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
12939 and then Has_Predicates
(Act_T
)
12940 and then not Has_Static_Predicate_Aspect
(Act_T
)
12943 ("actual for& cannot be a type with a dynamic predicate",
12944 Instantiation_Node
, A_Gen_T
);
12946 end Diagnose_Predicated_Actual
;
12948 --------------------
12949 -- Subtypes_Match --
12950 --------------------
12952 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
12953 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
12956 -- Check that the base types, root types (when dealing with class
12957 -- wide types), or designated types (when dealing with anonymous
12958 -- access types) of Gen_T and Act_T are statically matching subtypes.
12960 return ((Base_Type
(T
) = Act_T
12961 or else Base_Type
(T
) = Base_Type
(Act_T
))
12962 and then Subtypes_Statically_Match
(T
, Act_T
))
12964 or else (Is_Class_Wide_Type
(Gen_T
)
12965 and then Is_Class_Wide_Type
(Act_T
)
12966 and then Subtypes_Match
12967 (Get_Instance_Of
(Root_Type
(Gen_T
)),
12968 Root_Type
(Act_T
)))
12970 or else (Is_Anonymous_Access_Type
(Gen_T
)
12971 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
12972 and then Subtypes_Statically_Match
12973 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
12974 end Subtypes_Match
;
12976 -----------------------------------------
12977 -- Validate_Access_Subprogram_Instance --
12978 -----------------------------------------
12980 procedure Validate_Access_Subprogram_Instance
is
12982 if not Is_Access_Type
(Act_T
)
12983 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
12986 ("expect access type in instantiation of &", Actual
, Gen_T
);
12987 Abandon_Instantiation
(Actual
);
12990 -- According to AI05-288, actuals for access_to_subprograms must be
12991 -- subtype conformant with the generic formal. Previous to AI05-288
12992 -- only mode conformance was required.
12994 -- This is a binding interpretation that applies to previous versions
12995 -- of the language, no need to maintain previous weaker checks.
12997 Check_Subtype_Conformant
12998 (Designated_Type
(Act_T
),
12999 Designated_Type
(A_Gen_T
),
13003 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
13004 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
13006 ("protected access type not allowed for formal &",
13010 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
13012 ("expect protected access type for formal &",
13016 -- If the formal has a specified convention (which in most cases
13017 -- will be StdCall) verify that the actual has the same convention.
13019 if Has_Convention_Pragma
(A_Gen_T
)
13020 and then Convention
(A_Gen_T
) /= Convention
(Act_T
)
13022 Error_Msg_Name_1
:= Get_Convention_Name
(Convention
(A_Gen_T
));
13024 ("actual for formal & must have convention %", Actual
, Gen_T
);
13027 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13029 ("non null exclusion of actual and formal & do not match",
13032 end Validate_Access_Subprogram_Instance
;
13034 -----------------------------------
13035 -- Validate_Access_Type_Instance --
13036 -----------------------------------
13038 procedure Validate_Access_Type_Instance
is
13039 Desig_Type
: constant Entity_Id
:=
13040 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
13041 Desig_Act
: Entity_Id
;
13044 if not Is_Access_Type
(Act_T
) then
13046 ("expect access type in instantiation of &", Actual
, Gen_T
);
13047 Abandon_Instantiation
(Actual
);
13050 if Is_Access_Constant
(A_Gen_T
) then
13051 if not Is_Access_Constant
(Act_T
) then
13053 ("actual type must be access-to-constant type", Actual
);
13054 Abandon_Instantiation
(Actual
);
13057 if Is_Access_Constant
(Act_T
) then
13059 ("actual type must be access-to-variable type", Actual
);
13060 Abandon_Instantiation
(Actual
);
13062 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
13063 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
13066 ("actual must be general access type!", Actual
);
13067 Error_Msg_NE
-- CODEFIX
13068 ("\add ALL to }!", Actual
, Act_T
);
13069 Abandon_Instantiation
(Actual
);
13073 -- The designated subtypes, that is to say the subtypes introduced
13074 -- by an access type declaration (and not by a subtype declaration)
13077 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
13079 -- The designated type may have been introduced through a limited_
13080 -- with clause, in which case retrieve the non-limited view. This
13081 -- applies to incomplete types as well as to class-wide types.
13083 if From_Limited_With
(Desig_Act
) then
13084 Desig_Act
:= Available_View
(Desig_Act
);
13087 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
13089 ("designated type of actual does not match that of formal &",
13092 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
13093 Error_Msg_N
("\predicates do not match", Actual
);
13096 Abandon_Instantiation
(Actual
);
13099 -- Ada 2005: null-exclusion indicators of the two types must agree
13101 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13103 ("non null exclusion of actual and formal & do not match",
13106 end Validate_Access_Type_Instance
;
13108 ----------------------------------
13109 -- Validate_Array_Type_Instance --
13110 ----------------------------------
13112 procedure Validate_Array_Type_Instance
is
13117 function Formal_Dimensions
return Nat
;
13118 -- Count number of dimensions in array type formal
13120 -----------------------
13121 -- Formal_Dimensions --
13122 -----------------------
13124 function Formal_Dimensions
return Nat
is
13129 if Nkind
(Def
) = N_Constrained_Array_Definition
then
13130 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
13132 Index
:= First
(Subtype_Marks
(Def
));
13135 while Present
(Index
) loop
13141 end Formal_Dimensions
;
13143 -- Start of processing for Validate_Array_Type_Instance
13146 if not Is_Array_Type
(Act_T
) then
13148 ("expect array type in instantiation of &", Actual
, Gen_T
);
13149 Abandon_Instantiation
(Actual
);
13151 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
13152 if not (Is_Constrained
(Act_T
)) then
13154 ("expect constrained array in instantiation of &",
13156 Abandon_Instantiation
(Actual
);
13160 if Is_Constrained
(Act_T
) then
13162 ("expect unconstrained array in instantiation of &",
13164 Abandon_Instantiation
(Actual
);
13168 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
13170 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
13171 Abandon_Instantiation
(Actual
);
13174 I1
:= First_Index
(A_Gen_T
);
13175 I2
:= First_Index
(Act_T
);
13176 for J
in 1 .. Formal_Dimensions
loop
13178 -- If the indexes of the actual were given by a subtype_mark,
13179 -- the index was transformed into a range attribute. Retrieve
13180 -- the original type mark for checking.
13182 if Is_Entity_Name
(Original_Node
(I2
)) then
13183 T2
:= Entity
(Original_Node
(I2
));
13188 if not Subtypes_Match
13189 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
13192 ("index types of actual do not match those of formal &",
13194 Abandon_Instantiation
(Actual
);
13201 -- Check matching subtypes. Note that there are complex visibility
13202 -- issues when the generic is a child unit and some aspect of the
13203 -- generic type is declared in a parent unit of the generic. We do
13204 -- the test to handle this special case only after a direct check
13205 -- for static matching has failed. The case where both the component
13206 -- type and the array type are separate formals, and the component
13207 -- type is a private view may also require special checking in
13208 -- Subtypes_Match. Finally, we assume that a child instance where
13209 -- the component type comes from a formal of a parent instance is
13210 -- correct because the generic was correct. A more precise check
13211 -- seems too complex to install???
13214 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
13217 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
13218 Component_Type
(Act_T
))
13220 (not Inside_A_Generic
13221 and then Is_Child_Unit
(Scope
(Component_Type
(A_Gen_T
))))
13226 ("component subtype of actual does not match that of formal &",
13228 Abandon_Instantiation
(Actual
);
13231 if Has_Aliased_Components
(A_Gen_T
)
13232 and then not Has_Aliased_Components
(Act_T
)
13235 ("actual must have aliased components to match formal type &",
13238 end Validate_Array_Type_Instance
;
13240 -----------------------------------------------
13241 -- Validate_Derived_Interface_Type_Instance --
13242 -----------------------------------------------
13244 procedure Validate_Derived_Interface_Type_Instance
is
13245 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
13249 -- First apply interface instance checks
13251 Validate_Interface_Type_Instance
;
13253 -- Verify that immediate parent interface is an ancestor of
13257 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
13260 ("interface actual must include progenitor&", Actual
, Par
);
13263 -- Now verify that the actual includes all other ancestors of
13266 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
13267 while Present
(Elmt
) loop
13268 if not Interface_Present_In_Ancestor
13269 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
13272 ("interface actual must include progenitor&",
13273 Actual
, Node
(Elmt
));
13278 end Validate_Derived_Interface_Type_Instance
;
13280 ------------------------------------
13281 -- Validate_Derived_Type_Instance --
13282 ------------------------------------
13284 procedure Validate_Derived_Type_Instance
is
13285 Actual_Discr
: Entity_Id
;
13286 Ancestor_Discr
: Entity_Id
;
13289 -- Verify that the actual includes the progenitors of the formal,
13290 -- if any. The formal may depend on previous formals and their
13291 -- instance, so we must examine instance of interfaces if present.
13292 -- The actual may be an extension of an interface, in which case
13293 -- it does not appear in the interface list, so this must be
13294 -- checked separately.
13296 if Present
(Interface_List
(Def
)) then
13297 if not Has_Interfaces
(Act_T
) then
13299 ("actual must implement all interfaces of formal&",
13304 Act_Iface_List
: Elist_Id
;
13306 Iface_Ent
: Entity_Id
;
13308 function Instance_Exists
(I
: Entity_Id
) return Boolean;
13309 -- If the interface entity is declared in a generic unit,
13310 -- this can only be legal if we are within an instantiation
13311 -- of a child of that generic. There is currently no
13312 -- mechanism to relate an interface declared within a
13313 -- generic to the corresponding interface in an instance,
13314 -- so we traverse the list of interfaces of the actual,
13315 -- looking for a name match.
13317 ---------------------
13318 -- Instance_Exists --
13319 ---------------------
13321 function Instance_Exists
(I
: Entity_Id
) return Boolean is
13322 Iface_Elmt
: Elmt_Id
;
13325 Iface_Elmt
:= First_Elmt
(Act_Iface_List
);
13326 while Present
(Iface_Elmt
) loop
13327 if Is_Generic_Instance
(Scope
(Node
(Iface_Elmt
)))
13328 and then Chars
(Node
(Iface_Elmt
)) = Chars
(I
)
13333 Next_Elmt
(Iface_Elmt
);
13337 end Instance_Exists
;
13340 Iface
:= First
(Abstract_Interface_List
(A_Gen_T
));
13341 Collect_Interfaces
(Act_T
, Act_Iface_List
);
13343 while Present
(Iface
) loop
13344 Iface_Ent
:= Get_Instance_Of
(Entity
(Iface
));
13346 if Is_Ancestor
(Iface_Ent
, Act_T
)
13347 or else Is_Progenitor
(Iface_Ent
, Act_T
)
13351 elsif Ekind
(Scope
(Iface_Ent
)) = E_Generic_Package
13352 and then Instance_Exists
(Iface_Ent
)
13357 Error_Msg_Name_1
:= Chars
(Act_T
);
13359 ("actual% must implement interface&",
13360 Actual
, Etype
(Iface
));
13369 -- If the parent type in the generic declaration is itself a previous
13370 -- formal type, then it is local to the generic and absent from the
13371 -- analyzed generic definition. In that case the ancestor is the
13372 -- instance of the formal (which must have been instantiated
13373 -- previously), unless the ancestor is itself a formal derived type.
13374 -- In this latter case (which is the subject of Corrigendum 8652/0038
13375 -- (AI-202) the ancestor of the formals is the ancestor of its
13376 -- parent. Otherwise, the analyzed generic carries the parent type.
13377 -- If the parent type is defined in a previous formal package, then
13378 -- the scope of that formal package is that of the generic type
13379 -- itself, and it has already been mapped into the corresponding type
13380 -- in the actual package.
13382 -- Common case: parent type defined outside of the generic
13384 if Is_Entity_Name
(Subtype_Mark
(Def
))
13385 and then Present
(Entity
(Subtype_Mark
(Def
)))
13387 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
13389 -- Check whether parent is defined in a previous formal package
13392 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
13395 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
13397 -- The type may be a local derivation, or a type extension of a
13398 -- previous formal, or of a formal of a parent package.
13400 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
13402 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
13404 -- Check whether the parent is another derived formal type in the
13405 -- same generic unit.
13407 if Etype
(A_Gen_T
) /= A_Gen_T
13408 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13409 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
13410 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
13412 -- Locate ancestor of parent from the subtype declaration
13413 -- created for the actual.
13419 Decl
:= First
(Actual_Decls
);
13420 while Present
(Decl
) loop
13421 if Nkind
(Decl
) = N_Subtype_Declaration
13422 and then Chars
(Defining_Identifier
(Decl
)) =
13423 Chars
(Etype
(A_Gen_T
))
13425 Ancestor
:= Generic_Parent_Type
(Decl
);
13433 pragma Assert
(Present
(Ancestor
));
13435 -- The ancestor itself may be a previous formal that has been
13438 Ancestor
:= Get_Instance_Of
(Ancestor
);
13442 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
13445 -- Check whether parent is a previous formal of the current generic
13447 elsif Is_Derived_Type
(A_Gen_T
)
13448 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13449 and then Scope
(A_Gen_T
) = Scope
(Etype
(A_Gen_T
))
13451 Ancestor
:= Get_Instance_Of
(First_Subtype
(Etype
(A_Gen_T
)));
13453 -- An unusual case: the actual is a type declared in a parent unit,
13454 -- but is not a formal type so there is no instance_of for it.
13455 -- Retrieve it by analyzing the record extension.
13457 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
13458 and then In_Open_Scopes
(Scope
(Act_T
))
13459 and then Is_Generic_Instance
(Scope
(Act_T
))
13461 Analyze
(Subtype_Mark
(Def
));
13462 Ancestor
:= Entity
(Subtype_Mark
(Def
));
13465 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
13468 -- If the formal derived type has pragma Preelaborable_Initialization
13469 -- then the actual type must have preelaborable initialization.
13471 if Known_To_Have_Preelab_Init
(A_Gen_T
)
13472 and then not Has_Preelaborable_Initialization
(Act_T
)
13475 ("actual for & must have preelaborable initialization",
13479 -- Ada 2005 (AI-251)
13481 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
13482 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
13484 ("(Ada 2005) expected type implementing & in instantiation",
13488 -- Finally verify that the (instance of) the ancestor is an ancestor
13491 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
13493 ("expect type derived from & in instantiation",
13494 Actual
, First_Subtype
(Ancestor
));
13495 Abandon_Instantiation
(Actual
);
13498 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
13499 -- that the formal type declaration has been rewritten as a private
13502 if Ada_Version
>= Ada_2005
13503 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
13504 and then Synchronized_Present
(Parent
(A_Gen_T
))
13506 -- The actual must be a synchronized tagged type
13508 if not Is_Tagged_Type
(Act_T
) then
13510 ("actual of synchronized type must be tagged", Actual
);
13511 Abandon_Instantiation
(Actual
);
13513 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
13514 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
13515 N_Derived_Type_Definition
13516 and then not Synchronized_Present
13517 (Type_Definition
(Parent
(Act_T
)))
13520 ("actual of synchronized type must be synchronized", Actual
);
13521 Abandon_Instantiation
(Actual
);
13525 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
13526 -- removes the second instance of the phrase "or allow pass by copy".
13528 -- For Ada 2022, the aspect may be specified explicitly for the
13529 -- formal regardless of whether an ancestor obeys it.
13531 if Is_Atomic
(Act_T
)
13532 and then not Is_Atomic
(Ancestor
)
13533 and then not Is_Atomic
(A_Gen_T
)
13536 ("cannot have atomic actual type for non-atomic formal type",
13539 elsif Is_Volatile
(Act_T
)
13540 and then not Is_Volatile
(Ancestor
)
13541 and then not Is_Volatile
(A_Gen_T
)
13544 ("cannot have volatile actual type for non-volatile formal type",
13548 -- It should not be necessary to check for unknown discriminants on
13549 -- Formal, but for some reason Has_Unknown_Discriminants is false for
13550 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
13551 -- needs fixing. ???
13553 if Is_Definite_Subtype
(A_Gen_T
)
13554 and then not Unknown_Discriminants_Present
(Formal
)
13555 and then not Is_Definite_Subtype
(Act_T
)
13557 Error_Msg_N
("actual subtype must be constrained", Actual
);
13558 Abandon_Instantiation
(Actual
);
13561 if not Unknown_Discriminants_Present
(Formal
) then
13562 if Is_Constrained
(Ancestor
) then
13563 if not Is_Constrained
(Act_T
) then
13564 Error_Msg_N
("actual subtype must be constrained", Actual
);
13565 Abandon_Instantiation
(Actual
);
13568 -- Ancestor is unconstrained, Check if generic formal and actual
13569 -- agree on constrainedness. The check only applies to array types
13570 -- and discriminated types.
13572 elsif Is_Constrained
(Act_T
) then
13573 if Ekind
(Ancestor
) = E_Access_Type
13574 or else (not Is_Constrained
(A_Gen_T
)
13575 and then Is_Composite_Type
(A_Gen_T
))
13577 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
13578 Abandon_Instantiation
(Actual
);
13581 -- A class-wide type is only allowed if the formal has unknown
13584 elsif Is_Class_Wide_Type
(Act_T
)
13585 and then not Has_Unknown_Discriminants
(Ancestor
)
13588 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
13589 Abandon_Instantiation
(Actual
);
13591 -- Otherwise, the formal and actual must have the same number
13592 -- of discriminants and each discriminant of the actual must
13593 -- correspond to a discriminant of the formal.
13595 elsif Has_Discriminants
(Act_T
)
13596 and then not Has_Unknown_Discriminants
(Act_T
)
13597 and then Has_Discriminants
(Ancestor
)
13599 Actual_Discr
:= First_Discriminant
(Act_T
);
13600 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
13601 while Present
(Actual_Discr
)
13602 and then Present
(Ancestor_Discr
)
13604 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
13605 No
(Corresponding_Discriminant
(Actual_Discr
))
13608 ("discriminant & does not correspond "
13609 & "to ancestor discriminant", Actual
, Actual_Discr
);
13610 Abandon_Instantiation
(Actual
);
13613 Next_Discriminant
(Actual_Discr
);
13614 Next_Discriminant
(Ancestor_Discr
);
13617 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
13619 ("actual for & must have same number of discriminants",
13621 Abandon_Instantiation
(Actual
);
13624 -- This case should be caught by the earlier check for
13625 -- constrainedness, but the check here is added for completeness.
13627 elsif Has_Discriminants
(Act_T
)
13628 and then not Has_Unknown_Discriminants
(Act_T
)
13631 ("actual for & must not have discriminants", Actual
, Gen_T
);
13632 Abandon_Instantiation
(Actual
);
13634 elsif Has_Discriminants
(Ancestor
) then
13636 ("actual for & must have known discriminants", Actual
, Gen_T
);
13637 Abandon_Instantiation
(Actual
);
13640 if not Subtypes_Statically_Compatible
13641 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
13644 ("actual for & must be statically compatible with ancestor",
13647 if not Predicates_Compatible
(Act_T
, Ancestor
) then
13649 ("\predicate on actual is not compatible with ancestor",
13653 Abandon_Instantiation
(Actual
);
13657 -- If the formal and actual types are abstract, check that there
13658 -- are no abstract primitives of the actual type that correspond to
13659 -- nonabstract primitives of the formal type (second sentence of
13662 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
13663 Check_Abstract_Primitives
: declare
13664 Gen_Prims
: constant Elist_Id
:=
13665 Primitive_Operations
(A_Gen_T
);
13666 Gen_Elmt
: Elmt_Id
;
13667 Gen_Subp
: Entity_Id
;
13668 Anc_Subp
: Entity_Id
;
13669 Anc_Formal
: Entity_Id
;
13670 Anc_F_Type
: Entity_Id
;
13672 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
13673 Act_Elmt
: Elmt_Id
;
13674 Act_Subp
: Entity_Id
;
13675 Act_Formal
: Entity_Id
;
13676 Act_F_Type
: Entity_Id
;
13678 Subprograms_Correspond
: Boolean;
13680 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
13681 -- Returns true if T2 is derived directly or indirectly from
13682 -- T1, including derivations from interfaces. T1 and T2 are
13683 -- required to be specific tagged base types.
13685 ------------------------
13686 -- Is_Tagged_Ancestor --
13687 ------------------------
13689 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
13691 Intfc_Elmt
: Elmt_Id
;
13694 -- The predicate is satisfied if the types are the same
13699 -- If we've reached the top of the derivation chain then
13700 -- we know that T1 is not an ancestor of T2.
13702 elsif Etype
(T2
) = T2
then
13705 -- Proceed to check T2's immediate parent
13707 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
13710 -- Finally, check to see if T1 is an ancestor of any of T2's
13714 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
13715 while Present
(Intfc_Elmt
) loop
13716 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
13720 Next_Elmt
(Intfc_Elmt
);
13725 end Is_Tagged_Ancestor
;
13727 -- Start of processing for Check_Abstract_Primitives
13730 -- Loop over all of the formal derived type's primitives
13732 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
13733 while Present
(Gen_Elmt
) loop
13734 Gen_Subp
:= Node
(Gen_Elmt
);
13736 -- If the primitive of the formal is not abstract, then
13737 -- determine whether there is a corresponding primitive of
13738 -- the actual type that's abstract.
13740 if not Is_Abstract_Subprogram
(Gen_Subp
) then
13741 Act_Elmt
:= First_Elmt
(Act_Prims
);
13742 while Present
(Act_Elmt
) loop
13743 Act_Subp
:= Node
(Act_Elmt
);
13745 -- If we find an abstract primitive of the actual,
13746 -- then we need to test whether it corresponds to the
13747 -- subprogram from which the generic formal primitive
13750 if Is_Abstract_Subprogram
(Act_Subp
) then
13751 Anc_Subp
:= Alias
(Gen_Subp
);
13753 -- Test whether we have a corresponding primitive
13754 -- by comparing names, kinds, formal types, and
13757 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
13758 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
13760 Anc_Formal
:= First_Formal
(Anc_Subp
);
13761 Act_Formal
:= First_Formal
(Act_Subp
);
13762 while Present
(Anc_Formal
)
13763 and then Present
(Act_Formal
)
13765 Anc_F_Type
:= Etype
(Anc_Formal
);
13766 Act_F_Type
:= Etype
(Act_Formal
);
13768 if Ekind
(Anc_F_Type
) =
13769 E_Anonymous_Access_Type
13771 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
13773 if Ekind
(Act_F_Type
) =
13774 E_Anonymous_Access_Type
13777 Designated_Type
(Act_F_Type
);
13783 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
13788 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13789 Act_F_Type
:= Base_Type
(Act_F_Type
);
13791 -- If the formal is controlling, then the
13792 -- the type of the actual primitive's formal
13793 -- must be derived directly or indirectly
13794 -- from the type of the ancestor primitive's
13797 if Is_Controlling_Formal
(Anc_Formal
) then
13798 if not Is_Tagged_Ancestor
13799 (Anc_F_Type
, Act_F_Type
)
13804 -- Otherwise the types of the formals must
13807 elsif Anc_F_Type
/= Act_F_Type
then
13811 Next_Formal
(Anc_Formal
);
13812 Next_Formal
(Act_Formal
);
13815 -- If we traversed through all of the formals
13816 -- then so far the subprograms correspond, so
13817 -- now check that any result types correspond.
13819 if No
(Anc_Formal
) and then No
(Act_Formal
) then
13820 Subprograms_Correspond
:= True;
13822 if Ekind
(Act_Subp
) = E_Function
then
13823 Anc_F_Type
:= Etype
(Anc_Subp
);
13824 Act_F_Type
:= Etype
(Act_Subp
);
13826 if Ekind
(Anc_F_Type
) =
13827 E_Anonymous_Access_Type
13830 Designated_Type
(Anc_F_Type
);
13832 if Ekind
(Act_F_Type
) =
13833 E_Anonymous_Access_Type
13836 Designated_Type
(Act_F_Type
);
13838 Subprograms_Correspond
:= False;
13843 = E_Anonymous_Access_Type
13845 Subprograms_Correspond
:= False;
13848 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13849 Act_F_Type
:= Base_Type
(Act_F_Type
);
13851 -- Now either the result types must be
13852 -- the same or, if the result type is
13853 -- controlling, the result type of the
13854 -- actual primitive must descend from the
13855 -- result type of the ancestor primitive.
13857 if Subprograms_Correspond
13858 and then Anc_F_Type
/= Act_F_Type
13860 Has_Controlling_Result
(Anc_Subp
)
13861 and then not Is_Tagged_Ancestor
13862 (Anc_F_Type
, Act_F_Type
)
13864 Subprograms_Correspond
:= False;
13868 -- Found a matching subprogram belonging to
13869 -- formal ancestor type, so actual subprogram
13870 -- corresponds and this violates 3.9.3(9).
13872 if Subprograms_Correspond
then
13874 ("abstract subprogram & overrides "
13875 & "nonabstract subprogram of ancestor",
13882 Next_Elmt
(Act_Elmt
);
13886 Next_Elmt
(Gen_Elmt
);
13888 end Check_Abstract_Primitives
;
13891 -- Verify that limitedness matches. If parent is a limited
13892 -- interface then the generic formal is not unless declared
13893 -- explicitly so. If not declared limited, the actual cannot be
13894 -- limited (see AI05-0087).
13896 if Is_Limited_Type
(Act_T
) and then not Is_Limited_Type
(A_Gen_T
) then
13897 if not In_Instance
then
13899 ("actual for non-limited & cannot be a limited type",
13901 Explain_Limited_Type
(Act_T
, Actual
);
13902 Abandon_Instantiation
(Actual
);
13906 -- Check for AI12-0036
13909 Formal_Is_Private_Extension
: constant Boolean :=
13910 Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
;
13912 Actual_Is_Tagged
: constant Boolean := Is_Tagged_Type
(Act_T
);
13915 if Actual_Is_Tagged
/= Formal_Is_Private_Extension
then
13916 if not In_Instance
then
13917 if Actual_Is_Tagged
then
13919 ("actual for & cannot be a tagged type", Actual
, Gen_T
);
13922 ("actual for & must be a tagged type", Actual
, Gen_T
);
13925 Abandon_Instantiation
(Actual
);
13929 end Validate_Derived_Type_Instance
;
13931 ----------------------------------------
13932 -- Validate_Discriminated_Formal_Type --
13933 ----------------------------------------
13935 procedure Validate_Discriminated_Formal_Type
is
13936 Formal_Discr
: Entity_Id
;
13937 Actual_Discr
: Entity_Id
;
13938 Formal_Subt
: Entity_Id
;
13941 if Has_Discriminants
(A_Gen_T
) then
13942 if not Has_Discriminants
(Act_T
) then
13944 ("actual for & must have discriminants", Actual
, Gen_T
);
13945 Abandon_Instantiation
(Actual
);
13947 elsif Is_Constrained
(Act_T
) then
13949 ("actual for & must be unconstrained", Actual
, Gen_T
);
13950 Abandon_Instantiation
(Actual
);
13953 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
13954 Actual_Discr
:= First_Discriminant
(Act_T
);
13955 while Formal_Discr
/= Empty
loop
13956 if Actual_Discr
= Empty
then
13958 ("discriminants on actual do not match formal",
13960 Abandon_Instantiation
(Actual
);
13963 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
13965 -- Access discriminants match if designated types do
13967 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
13968 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
13969 E_Anonymous_Access_Type
13972 (Designated_Type
(Base_Type
(Formal_Subt
))) =
13973 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
13977 elsif Base_Type
(Formal_Subt
) /=
13978 Base_Type
(Etype
(Actual_Discr
))
13981 ("types of actual discriminants must match formal",
13983 Abandon_Instantiation
(Actual
);
13985 elsif not Subtypes_Statically_Match
13986 (Formal_Subt
, Etype
(Actual_Discr
))
13987 and then Ada_Version
>= Ada_95
13990 ("subtypes of actual discriminants must match formal",
13992 Abandon_Instantiation
(Actual
);
13995 Next_Discriminant
(Formal_Discr
);
13996 Next_Discriminant
(Actual_Discr
);
13999 if Actual_Discr
/= Empty
then
14001 ("discriminants on actual do not match formal",
14003 Abandon_Instantiation
(Actual
);
14007 end Validate_Discriminated_Formal_Type
;
14009 ---------------------------------------
14010 -- Validate_Incomplete_Type_Instance --
14011 ---------------------------------------
14013 procedure Validate_Incomplete_Type_Instance
is
14015 if not Is_Tagged_Type
(Act_T
)
14016 and then Is_Tagged_Type
(A_Gen_T
)
14019 ("actual for & must be a tagged type", Actual
, Gen_T
);
14022 Validate_Discriminated_Formal_Type
;
14023 end Validate_Incomplete_Type_Instance
;
14025 --------------------------------------
14026 -- Validate_Interface_Type_Instance --
14027 --------------------------------------
14029 procedure Validate_Interface_Type_Instance
is
14031 if not Is_Interface
(Act_T
) then
14033 ("actual for formal interface type must be an interface",
14036 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
14037 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
14038 or else Is_Protected_Interface
(A_Gen_T
) /=
14039 Is_Protected_Interface
(Act_T
)
14040 or else Is_Synchronized_Interface
(A_Gen_T
) /=
14041 Is_Synchronized_Interface
(Act_T
)
14044 ("actual for interface& does not match (RM 12.5.5(4))",
14047 end Validate_Interface_Type_Instance
;
14049 ------------------------------------
14050 -- Validate_Private_Type_Instance --
14051 ------------------------------------
14053 procedure Validate_Private_Type_Instance
is
14055 if Is_Limited_Type
(Act_T
)
14056 and then not Is_Limited_Type
(A_Gen_T
)
14058 if In_Instance
then
14062 ("actual for non-limited & cannot be a limited type", Actual
,
14064 Explain_Limited_Type
(Act_T
, Actual
);
14065 Abandon_Instantiation
(Actual
);
14068 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
14069 and then not Has_Preelaborable_Initialization
(Act_T
)
14072 ("actual for & must have preelaborable initialization", Actual
,
14075 elsif not Is_Definite_Subtype
(Act_T
)
14076 and then Is_Definite_Subtype
(A_Gen_T
)
14077 and then Ada_Version
>= Ada_95
14080 ("actual for & must be a definite subtype", Actual
, Gen_T
);
14082 elsif not Is_Tagged_Type
(Act_T
)
14083 and then Is_Tagged_Type
(A_Gen_T
)
14086 ("actual for & must be a tagged type", Actual
, Gen_T
);
14089 Validate_Discriminated_Formal_Type
;
14091 end Validate_Private_Type_Instance
;
14093 -- Start of processing for Instantiate_Type
14096 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
14097 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
14098 return New_List
(Error
);
14100 elsif not Is_Entity_Name
(Actual
)
14101 or else not Is_Type
(Entity
(Actual
))
14104 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
14105 Abandon_Instantiation
(Actual
);
14108 Act_T
:= Entity
(Actual
);
14110 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
14111 -- as a generic actual parameter if the corresponding formal type
14112 -- does not have a known_discriminant_part, or is a formal derived
14113 -- type that is an Unchecked_Union type.
14115 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
14116 if not Has_Discriminants
(A_Gen_T
)
14117 or else (Is_Derived_Type
(A_Gen_T
)
14118 and then Is_Unchecked_Union
(A_Gen_T
))
14122 Error_Msg_N
("unchecked union cannot be the actual for a "
14123 & "discriminated formal type", Act_T
);
14128 -- Deal with fixed/floating restrictions
14130 if Is_Floating_Point_Type
(Act_T
) then
14131 Check_Restriction
(No_Floating_Point
, Actual
);
14132 elsif Is_Fixed_Point_Type
(Act_T
) then
14133 Check_Restriction
(No_Fixed_Point
, Actual
);
14136 -- Deal with error of using incomplete type as generic actual.
14137 -- This includes limited views of a type, even if the non-limited
14138 -- view may be available.
14140 if Ekind
(Act_T
) = E_Incomplete_Type
14141 or else (Is_Class_Wide_Type
(Act_T
)
14142 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
14144 -- If the formal is an incomplete type, the actual can be
14145 -- incomplete as well, but if an actual incomplete type has
14146 -- a full view, then we'll retrieve that.
14148 if Ekind
(A_Gen_T
) = E_Incomplete_Type
14149 and then No
(Full_View
(Act_T
))
14153 elsif Is_Class_Wide_Type
(Act_T
)
14154 or else No
(Full_View
(Act_T
))
14156 Error_Msg_N
("premature use of incomplete type", Actual
);
14157 Abandon_Instantiation
(Actual
);
14160 Act_T
:= Full_View
(Act_T
);
14161 Set_Entity
(Actual
, Act_T
);
14163 if Has_Private_Component
(Act_T
) then
14165 ("premature use of type with private component", Actual
);
14169 -- Deal with error of premature use of private type as generic actual
14171 elsif Is_Private_Type
(Act_T
)
14172 and then Is_Private_Type
(Base_Type
(Act_T
))
14173 and then not Is_Generic_Type
(Act_T
)
14174 and then not Is_Derived_Type
(Act_T
)
14175 and then No
(Full_View
(Root_Type
(Act_T
)))
14177 -- If the formal is an incomplete type, the actual can be
14178 -- private or incomplete as well.
14180 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
14183 Error_Msg_N
("premature use of private type", Actual
);
14186 elsif Has_Private_Component
(Act_T
) then
14188 ("premature use of type with private component", Actual
);
14191 Set_Instance_Of
(A_Gen_T
, Act_T
);
14193 -- If the type is generic, the class-wide type may also be used
14195 if Is_Tagged_Type
(A_Gen_T
)
14196 and then Is_Tagged_Type
(Act_T
)
14197 and then not Is_Class_Wide_Type
(A_Gen_T
)
14199 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
14200 Class_Wide_Type
(Act_T
));
14203 if not Is_Abstract_Type
(A_Gen_T
)
14204 and then Is_Abstract_Type
(Act_T
)
14207 ("actual of non-abstract formal cannot be abstract", Actual
);
14210 -- A generic scalar type is a first subtype for which we generate
14211 -- an anonymous base type. Indicate that the instance of this base
14212 -- is the base type of the actual.
14214 if Is_Scalar_Type
(A_Gen_T
) then
14215 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
14219 Check_Shared_Variable_Control_Aspects
;
14221 if Error_Posted
(Act_T
) then
14224 case Nkind
(Def
) is
14225 when N_Formal_Private_Type_Definition
=>
14226 Validate_Private_Type_Instance
;
14228 when N_Formal_Incomplete_Type_Definition
=>
14229 Validate_Incomplete_Type_Instance
;
14231 when N_Formal_Derived_Type_Definition
=>
14232 Validate_Derived_Type_Instance
;
14234 when N_Formal_Discrete_Type_Definition
=>
14235 if not Is_Discrete_Type
(Act_T
) then
14237 ("expect discrete type in instantiation of&",
14239 Abandon_Instantiation
(Actual
);
14242 Diagnose_Predicated_Actual
;
14244 when N_Formal_Signed_Integer_Type_Definition
=>
14245 if not Is_Signed_Integer_Type
(Act_T
) then
14247 ("expect signed integer type in instantiation of&",
14249 Abandon_Instantiation
(Actual
);
14252 Diagnose_Predicated_Actual
;
14254 when N_Formal_Modular_Type_Definition
=>
14255 if not Is_Modular_Integer_Type
(Act_T
) then
14257 ("expect modular type in instantiation of &",
14259 Abandon_Instantiation
(Actual
);
14262 Diagnose_Predicated_Actual
;
14264 when N_Formal_Floating_Point_Definition
=>
14265 if not Is_Floating_Point_Type
(Act_T
) then
14267 ("expect float type in instantiation of &", Actual
, Gen_T
);
14268 Abandon_Instantiation
(Actual
);
14271 when N_Formal_Ordinary_Fixed_Point_Definition
=>
14272 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
14274 ("expect ordinary fixed point type in instantiation of &",
14276 Abandon_Instantiation
(Actual
);
14279 when N_Formal_Decimal_Fixed_Point_Definition
=>
14280 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
14282 ("expect decimal type in instantiation of &",
14284 Abandon_Instantiation
(Actual
);
14287 when N_Array_Type_Definition
=>
14288 Validate_Array_Type_Instance
;
14290 when N_Access_To_Object_Definition
=>
14291 Validate_Access_Type_Instance
;
14293 when N_Access_Function_Definition
14294 | N_Access_Procedure_Definition
14296 Validate_Access_Subprogram_Instance
;
14298 when N_Record_Definition
=>
14299 Validate_Interface_Type_Instance
;
14301 when N_Derived_Type_Definition
=>
14302 Validate_Derived_Interface_Type_Instance
;
14305 raise Program_Error
;
14309 Subt
:= New_Copy
(Gen_T
);
14311 -- Use adjusted sloc of subtype name as the location for other nodes in
14312 -- the subtype declaration.
14314 Loc
:= Sloc
(Subt
);
14317 Make_Subtype_Declaration
(Loc
,
14318 Defining_Identifier
=> Subt
,
14319 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
14321 Copy_Ghost_Aspect
(Formal
, To
=> Decl_Node
);
14323 -- Record whether the actual is private at this point, so that
14324 -- Check_Generic_Actuals can restore its proper view before the
14325 -- semantic analysis of the instance.
14327 if Is_Private_Type
(Act_T
) then
14328 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
14331 -- In Ada 2012 the actual may be a limited view. Indicate that
14332 -- the local subtype must be treated as such.
14334 if From_Limited_With
(Act_T
) then
14335 Mutate_Ekind
(Subt
, E_Incomplete_Subtype
);
14336 Set_From_Limited_With
(Subt
);
14339 Decl_Nodes
:= New_List
(Decl_Node
);
14341 -- Flag actual derived types so their elaboration produces the
14342 -- appropriate renamings for the primitive operations of the ancestor.
14343 -- Flag actual for formal private types as well, to determine whether
14344 -- operations in the private part may override inherited operations.
14345 -- If the formal has an interface list, the ancestor is not the
14346 -- parent, but the analyzed formal that includes the interface
14347 -- operations of all its progenitors.
14349 -- Same treatment for formal private types, so we can check whether the
14350 -- type is tagged limited when validating derivations in the private
14351 -- part. (See AI05-096).
14353 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
14354 if Present
(Interface_List
(Def
)) then
14355 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14357 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
14360 elsif Nkind
(Def
) in N_Formal_Private_Type_Definition
14361 | N_Formal_Incomplete_Type_Definition
14363 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14366 -- If the actual is a synchronized type that implements an interface,
14367 -- the primitive operations are attached to the corresponding record,
14368 -- and we have to treat it as an additional generic actual, so that its
14369 -- primitive operations become visible in the instance. The task or
14370 -- protected type itself does not carry primitive operations.
14372 if Is_Concurrent_Type
(Act_T
)
14373 and then Is_Tagged_Type
(Act_T
)
14374 and then Present
(Corresponding_Record_Type
(Act_T
))
14375 and then Present
(Ancestor
)
14376 and then Is_Interface
(Ancestor
)
14379 Corr_Rec
: constant Entity_Id
:=
14380 Corresponding_Record_Type
(Act_T
);
14381 New_Corr
: Entity_Id
;
14382 Corr_Decl
: Node_Id
;
14385 New_Corr
:= Make_Temporary
(Loc
, 'S');
14387 Make_Subtype_Declaration
(Loc
,
14388 Defining_Identifier
=> New_Corr
,
14389 Subtype_Indication
=>
14390 New_Occurrence_Of
(Corr_Rec
, Loc
));
14391 Append_To
(Decl_Nodes
, Corr_Decl
);
14393 if Ekind
(Act_T
) = E_Task_Type
then
14394 Mutate_Ekind
(Subt
, E_Task_Subtype
);
14396 Mutate_Ekind
(Subt
, E_Protected_Subtype
);
14399 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
14400 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
14401 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
14405 -- For a floating-point type, capture dimension info if any, because
14406 -- the generated subtype declaration does not come from source and
14407 -- will not process dimensions.
14409 if Is_Floating_Point_Type
(Act_T
) then
14410 Copy_Dimensions
(Act_T
, Subt
);
14414 end Instantiate_Type
;
14416 -----------------------------
14417 -- Is_Abbreviated_Instance --
14418 -----------------------------
14420 function Is_Abbreviated_Instance
(E
: Entity_Id
) return Boolean is
14422 return Ekind
(E
) = E_Package
14423 and then Present
(Hidden_In_Formal_Instance
(E
));
14424 end Is_Abbreviated_Instance
;
14426 ---------------------
14427 -- Is_In_Main_Unit --
14428 ---------------------
14430 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
14431 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
14432 Current_Unit
: Node_Id
;
14435 if Unum
= Main_Unit
then
14438 -- If the current unit is a subunit then it is either the main unit or
14439 -- is being compiled as part of the main unit.
14441 elsif Nkind
(N
) = N_Compilation_Unit
then
14442 return Nkind
(Unit
(N
)) = N_Subunit
;
14445 Current_Unit
:= Parent
(N
);
14446 while Present
(Current_Unit
)
14447 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
14449 Current_Unit
:= Parent
(Current_Unit
);
14452 -- The instantiation node is in the main unit, or else the current node
14453 -- (perhaps as the result of nested instantiations) is in the main unit,
14454 -- or in the declaration of the main unit, which in this last case must
14458 Current_Unit
= Cunit
(Main_Unit
)
14459 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
14460 or else (Present
(Current_Unit
)
14461 and then Present
(Library_Unit
(Current_Unit
))
14462 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
14463 end Is_In_Main_Unit
;
14465 ----------------------------
14466 -- Load_Parent_Of_Generic --
14467 ----------------------------
14469 procedure Load_Parent_Of_Generic
14472 Body_Optional
: Boolean := False)
14474 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
14475 Saved_Style_Check
: constant Boolean := Style_Check
;
14476 Saved_Warn
: constant Warnings_State
:= Save_Warnings
;
14477 True_Parent
: Node_Id
;
14478 Inst_Node
: Node_Id
;
14480 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
14482 procedure Collect_Previous_Instances
(Decls
: List_Id
);
14483 -- Collect all instantiations in the given list of declarations, that
14484 -- precede the generic that we need to load. If the bodies of these
14485 -- instantiations are available, we must analyze them, to ensure that
14486 -- the public symbols generated are the same when the unit is compiled
14487 -- to generate code, and when it is compiled in the context of a unit
14488 -- that needs a particular nested instance. This process is applied to
14489 -- both package and subprogram instances.
14491 --------------------------------
14492 -- Collect_Previous_Instances --
14493 --------------------------------
14495 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
14499 Decl
:= First
(Decls
);
14500 while Present
(Decl
) loop
14501 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
14504 -- If Decl is an instantiation, then record it as requiring
14505 -- instantiation of the corresponding body, except if it is an
14506 -- abbreviated instantiation generated internally for conformance
14507 -- checking purposes only for the case of a formal package
14508 -- declared without a box (see Instantiate_Formal_Package). Such
14509 -- an instantiation does not generate any code (the actual code
14510 -- comes from actual) and thus does not need to be analyzed here.
14511 -- If the instantiation appears with a generic package body it is
14512 -- not analyzed here either.
14514 elsif Nkind
(Decl
) = N_Package_Instantiation
14515 and then not Is_Abbreviated_Instance
(Defining_Entity
(Decl
))
14517 Append_Elmt
(Decl
, Previous_Instances
);
14519 -- For a subprogram instantiation, omit instantiations intrinsic
14520 -- operations (Unchecked_Conversions, etc.) that have no bodies.
14522 elsif Nkind
(Decl
) in N_Function_Instantiation
14523 | N_Procedure_Instantiation
14524 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
14526 Append_Elmt
(Decl
, Previous_Instances
);
14528 elsif Nkind
(Decl
) = N_Package_Declaration
then
14529 Collect_Previous_Instances
14530 (Visible_Declarations
(Specification
(Decl
)));
14531 Collect_Previous_Instances
14532 (Private_Declarations
(Specification
(Decl
)));
14534 -- Previous non-generic bodies may contain instances as well
14536 elsif Nkind
(Decl
) = N_Package_Body
14537 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
14539 Collect_Previous_Instances
(Declarations
(Decl
));
14541 elsif Nkind
(Decl
) = N_Subprogram_Body
14542 and then not Acts_As_Spec
(Decl
)
14543 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
14545 Collect_Previous_Instances
(Declarations
(Decl
));
14550 end Collect_Previous_Instances
;
14552 -- Start of processing for Load_Parent_Of_Generic
14555 if not In_Same_Source_Unit
(N
, Spec
)
14556 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
14557 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
14558 and then not Is_In_Main_Unit
(Spec
))
14560 -- Find body of parent of spec, and analyze it. A special case arises
14561 -- when the parent is an instantiation, that is to say when we are
14562 -- currently instantiating a nested generic. In that case, there is
14563 -- no separate file for the body of the enclosing instance. Instead,
14564 -- the enclosing body must be instantiated as if it were a pending
14565 -- instantiation, in order to produce the body for the nested generic
14566 -- we require now. Note that in that case the generic may be defined
14567 -- in a package body, the instance defined in the same package body,
14568 -- and the original enclosing body may not be in the main unit.
14570 Inst_Node
:= Empty
;
14572 True_Parent
:= Parent
(Spec
);
14573 while Present
(True_Parent
)
14574 and then Nkind
(True_Parent
) /= N_Compilation_Unit
14576 if Nkind
(True_Parent
) = N_Package_Declaration
14578 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
14580 -- Parent is a compilation unit that is an instantiation, and
14581 -- instantiation node has been replaced with package decl.
14583 Inst_Node
:= Original_Node
(True_Parent
);
14586 elsif Nkind
(True_Parent
) = N_Package_Declaration
14587 and then Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
14589 Nkind
(Unit
(Parent
(True_Parent
))) = N_Package_Instantiation
14591 -- Parent is a compilation unit that is an instantiation, but
14592 -- instantiation node has not been replaced with package decl.
14594 Inst_Node
:= Unit
(Parent
(True_Parent
));
14597 elsif Nkind
(True_Parent
) = N_Package_Declaration
14598 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14599 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
14601 -- Parent is an instantiation within another specification.
14602 -- Declaration for instance has been inserted before original
14603 -- instantiation node. A direct link would be preferable?
14605 Inst_Node
:= Next
(True_Parent
);
14606 while Present
(Inst_Node
)
14607 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
14612 -- If the instance appears within a generic, and the generic
14613 -- unit is defined within a formal package of the enclosing
14614 -- generic, there is no generic body available, and none
14615 -- needed. A more precise test should be used ???
14617 if No
(Inst_Node
) then
14623 -- If an ancestor of the generic comes from a formal package
14624 -- there is no source for the ancestor body. This is detected
14625 -- by examining the scope of the ancestor and its declaration.
14626 -- The body, if any is needed, will be available when the
14627 -- current unit (containing a formal package) is instantiated.
14629 elsif Nkind
(True_Parent
) = N_Package_Specification
14630 and then Present
(Generic_Parent
(True_Parent
))
14632 (Original_Node
(Unit_Declaration_Node
14633 (Scope
(Generic_Parent
(True_Parent
)))))
14634 = N_Formal_Package_Declaration
14639 True_Parent
:= Parent
(True_Parent
);
14643 -- Case where we are currently instantiating a nested generic
14645 if Present
(Inst_Node
) then
14646 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
14648 -- Instantiation node and declaration of instantiated package
14649 -- were exchanged when only the declaration was needed.
14650 -- Restore instantiation node before proceeding with body.
14652 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
14655 -- Now complete instantiation of enclosing body, if it appears in
14656 -- some other unit. If it appears in the current unit, the body
14657 -- will have been instantiated already.
14659 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
14661 -- We need to determine the expander mode to instantiate the
14662 -- enclosing body. Because the generic body we need may use
14663 -- global entities declared in the enclosing package (including
14664 -- aggregates) it is in general necessary to compile this body
14665 -- with expansion enabled, except if we are within a generic
14666 -- package, in which case the usual generic rule applies.
14669 Exp_Status
: Boolean := True;
14673 -- Loop through scopes looking for generic package
14675 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
14676 while Present
(Scop
)
14677 and then Scop
/= Standard_Standard
14679 if Ekind
(Scop
) = E_Generic_Package
then
14680 Exp_Status
:= False;
14684 Scop
:= Scope
(Scop
);
14687 -- Collect previous instantiations in the unit that contains
14688 -- the desired generic.
14690 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14691 and then not Body_Optional
14695 Info
: Pending_Body_Info
;
14699 Par
:= Parent
(Inst_Node
);
14700 while Present
(Par
) loop
14701 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
14702 Par
:= Parent
(Par
);
14705 pragma Assert
(Present
(Par
));
14707 if Nkind
(Par
) = N_Package_Body
then
14708 Collect_Previous_Instances
(Declarations
(Par
));
14710 elsif Nkind
(Par
) = N_Package_Declaration
then
14711 Collect_Previous_Instances
14712 (Visible_Declarations
(Specification
(Par
)));
14713 Collect_Previous_Instances
14714 (Private_Declarations
(Specification
(Par
)));
14717 -- Enclosing unit is a subprogram body. In this
14718 -- case all instance bodies are processed in order
14719 -- and there is no need to collect them separately.
14724 Decl
:= First_Elmt
(Previous_Instances
);
14725 while Present
(Decl
) loop
14727 (Inst_Node
=> Node
(Decl
),
14729 Instance_Spec
(Node
(Decl
)),
14731 Config_Switches
=> Save_Config_Switches
,
14732 Current_Sem_Unit
=>
14733 Get_Code_Unit
(Sloc
(Node
(Decl
))),
14734 Expander_Status
=> Exp_Status
,
14735 Local_Suppress_Stack_Top
=>
14736 Local_Suppress_Stack_Top
,
14737 Scope_Suppress
=> Scope_Suppress
,
14738 Warnings
=> Save_Warnings
);
14740 -- Package instance
14742 if Nkind
(Node
(Decl
)) = N_Package_Instantiation
14744 Instantiate_Package_Body
14745 (Info
, Body_Optional
=> True);
14747 -- Subprogram instance
14750 -- The instance_spec is in the wrapper package,
14751 -- usually followed by its local renaming
14752 -- declaration. See Build_Subprogram_Renaming
14753 -- for details. If the instance carries aspects,
14754 -- these result in the corresponding pragmas,
14755 -- inserted after the subprogram declaration.
14756 -- They must be skipped as well when retrieving
14757 -- the desired spec. Some of them may have been
14758 -- rewritten as null statements.
14759 -- A direct link would be more robust ???
14763 (Last
(Visible_Declarations
14764 (Specification
(Info
.Act_Decl
))));
14766 while Nkind
(Decl
) in
14769 N_Subprogram_Renaming_Declaration
14771 Decl
:= Prev
(Decl
);
14774 Info
.Act_Decl
:= Decl
;
14777 Instantiate_Subprogram_Body
14778 (Info
, Body_Optional
=> True);
14786 Instantiate_Package_Body
14788 ((Inst_Node
=> Inst_Node
,
14789 Act_Decl
=> True_Parent
,
14791 Config_Switches
=> Save_Config_Switches
,
14792 Current_Sem_Unit
=>
14793 Get_Code_Unit
(Sloc
(Inst_Node
)),
14794 Expander_Status
=> Exp_Status
,
14795 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
14796 Scope_Suppress
=> Scope_Suppress
,
14797 Warnings
=> Save_Warnings
)),
14798 Body_Optional
=> Body_Optional
);
14802 -- Case where we are not instantiating a nested generic
14805 Opt
.Style_Check
:= False;
14806 Expander_Mode_Save_And_Set
(True);
14807 Load_Needed_Body
(Comp_Unit
, OK
);
14808 Opt
.Style_Check
:= Saved_Style_Check
;
14809 Restore_Warnings
(Saved_Warn
);
14810 Expander_Mode_Restore
;
14813 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
14814 and then not Body_Optional
14817 Bname
: constant Unit_Name_Type
:=
14818 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
14821 -- In CodePeer mode, the missing body may make the analysis
14822 -- incomplete, but we do not treat it as fatal.
14824 if CodePeer_Mode
then
14828 Error_Msg_Unit_1
:= Bname
;
14829 Error_Msg_N
("this instantiation requires$!", N
);
14830 Error_Msg_File_1
:=
14831 Get_File_Name
(Bname
, Subunit
=> False);
14832 Error_Msg_N
("\but file{ was not found!", N
);
14833 raise Unrecoverable_Error
;
14840 -- If loading parent of the generic caused an instantiation circularity,
14841 -- we abandon compilation at this point, because otherwise in some cases
14842 -- we get into trouble with infinite recursions after this point.
14844 if Circularity_Detected
then
14845 raise Unrecoverable_Error
;
14847 end Load_Parent_Of_Generic
;
14849 ---------------------------------
14850 -- Map_Formal_Package_Entities --
14851 ---------------------------------
14853 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
14858 Set_Instance_Of
(Form
, Act
);
14860 -- Traverse formal and actual package to map the corresponding entities.
14861 -- We skip over internal entities that may be generated during semantic
14862 -- analysis, and find the matching entities by name, given that they
14863 -- must appear in the same order.
14865 E1
:= First_Entity
(Form
);
14866 E2
:= First_Entity
(Act
);
14867 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
14868 -- Could this test be a single condition??? Seems like it could, and
14869 -- isn't FPE (Form) a constant anyway???
14871 if not Is_Internal
(E1
)
14872 and then Present
(Parent
(E1
))
14873 and then not Is_Class_Wide_Type
(E1
)
14874 and then not Is_Internal_Name
(Chars
(E1
))
14876 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
14883 Set_Instance_Of
(E1
, E2
);
14885 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
14886 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
14889 if Is_Constrained
(E1
) then
14890 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
14893 if Ekind
(E1
) = E_Package
and then No
(Renamed_Entity
(E1
)) then
14894 Map_Formal_Package_Entities
(E1
, E2
);
14901 end Map_Formal_Package_Entities
;
14903 -----------------------
14904 -- Move_Freeze_Nodes --
14905 -----------------------
14907 procedure Move_Freeze_Nodes
14908 (Out_Of
: Entity_Id
;
14913 Next_Decl
: Node_Id
;
14914 Next_Node
: Node_Id
:= After
;
14917 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
14918 -- Check whether entity is declared in a scope external to that of the
14921 -------------------
14922 -- Is_Outer_Type --
14923 -------------------
14925 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
14926 Scop
: Entity_Id
:= Scope
(T
);
14929 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
14933 while Scop
/= Standard_Standard
loop
14934 if Scop
= Out_Of
then
14937 Scop
:= Scope
(Scop
);
14945 -- Start of processing for Move_Freeze_Nodes
14952 -- First remove the freeze nodes that may appear before all other
14956 while Present
(Decl
)
14957 and then Nkind
(Decl
) = N_Freeze_Entity
14958 and then Is_Outer_Type
(Entity
(Decl
))
14960 Decl
:= Remove_Head
(L
);
14961 Insert_After
(Next_Node
, Decl
);
14962 Set_Analyzed
(Decl
, False);
14967 -- Next scan the list of declarations and remove each freeze node that
14968 -- appears ahead of the current node.
14970 while Present
(Decl
) loop
14971 while Present
(Next
(Decl
))
14972 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
14973 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
14975 Next_Decl
:= Remove_Next
(Decl
);
14976 Insert_After
(Next_Node
, Next_Decl
);
14977 Set_Analyzed
(Next_Decl
, False);
14978 Next_Node
:= Next_Decl
;
14981 -- If the declaration is a nested package or concurrent type, then
14982 -- recurse. Nested generic packages will have been processed from the
14985 case Nkind
(Decl
) is
14986 when N_Package_Declaration
=>
14987 Spec
:= Specification
(Decl
);
14989 when N_Task_Type_Declaration
=>
14990 Spec
:= Task_Definition
(Decl
);
14992 when N_Protected_Type_Declaration
=>
14993 Spec
:= Protected_Definition
(Decl
);
14999 if Present
(Spec
) then
15000 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
15001 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
15006 end Move_Freeze_Nodes
;
15012 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
15014 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
15017 ------------------------
15018 -- Preanalyze_Actuals --
15019 ------------------------
15021 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
) is
15022 procedure Perform_Appropriate_Analysis
(N
: Node_Id
);
15023 -- Determine if the actuals we are analyzing come from a generic
15024 -- instantiation that is a library unit and dispatch accordingly.
15026 ----------------------------------
15027 -- Perform_Appropriate_Analysis --
15028 ----------------------------------
15030 procedure Perform_Appropriate_Analysis
(N
: Node_Id
) is
15032 -- When we have a library instantiation we cannot allow any expansion
15033 -- to occur, since there may be no place to put it. Instead, in that
15034 -- case we perform a preanalysis of the actual.
15036 if Present
(Inst
) and then Is_Compilation_Unit
(Inst
) then
15041 end Perform_Appropriate_Analysis
;
15045 Errs
: constant Nat
:= Serious_Errors_Detected
;
15050 Cur
: Entity_Id
:= Empty
;
15051 -- Current homograph of the instance name
15053 Vis
: Boolean := False;
15054 -- Saved visibility status of the current homograph
15056 -- Start of processing for Preanalyze_Actuals
15059 Assoc
:= First
(Generic_Associations
(N
));
15061 -- If the instance is a child unit, its name may hide an outer homonym,
15062 -- so make it invisible to perform name resolution on the actuals.
15064 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
15066 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
15068 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
15070 if Is_Compilation_Unit
(Cur
) then
15071 Vis
:= Is_Immediately_Visible
(Cur
);
15072 Set_Is_Immediately_Visible
(Cur
, False);
15078 while Present
(Assoc
) loop
15079 if Nkind
(Assoc
) /= N_Others_Choice
then
15080 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
15082 -- Within a nested instantiation, a defaulted actual is an empty
15083 -- association, so nothing to analyze. If the subprogram actual
15084 -- is an attribute, analyze prefix only, because actual is not a
15085 -- complete attribute reference.
15087 -- If actual is an allocator, analyze expression only. The full
15088 -- analysis can generate code, and if instance is a compilation
15089 -- unit we have to wait until the package instance is installed
15090 -- to have a proper place to insert this code.
15092 -- String literals may be operators, but at this point we do not
15093 -- know whether the actual is a formal subprogram or a string.
15098 elsif Nkind
(Act
) = N_Attribute_Reference
then
15099 Perform_Appropriate_Analysis
(Prefix
(Act
));
15101 elsif Nkind
(Act
) = N_Explicit_Dereference
then
15102 Perform_Appropriate_Analysis
(Prefix
(Act
));
15104 elsif Nkind
(Act
) = N_Allocator
then
15106 Expr
: constant Node_Id
:= Expression
(Act
);
15109 if Nkind
(Expr
) = N_Subtype_Indication
then
15110 Perform_Appropriate_Analysis
(Subtype_Mark
(Expr
));
15112 -- Analyze separately each discriminant constraint, when
15113 -- given with a named association.
15119 Constr
:= First
(Constraints
(Constraint
(Expr
)));
15120 while Present
(Constr
) loop
15121 if Nkind
(Constr
) = N_Discriminant_Association
then
15122 Perform_Appropriate_Analysis
15123 (Expression
(Constr
));
15125 Perform_Appropriate_Analysis
(Constr
);
15133 Perform_Appropriate_Analysis
(Expr
);
15137 elsif Nkind
(Act
) /= N_Operator_Symbol
then
15138 Perform_Appropriate_Analysis
(Act
);
15140 -- Within a package instance, mark actuals that are limited
15141 -- views, so their use can be moved to the body of the
15144 if Is_Entity_Name
(Act
)
15145 and then Is_Type
(Entity
(Act
))
15146 and then From_Limited_With
(Entity
(Act
))
15147 and then Present
(Inst
)
15149 Append_Elmt
(Entity
(Act
), Incomplete_Actuals
(Inst
));
15153 if Errs
/= Serious_Errors_Detected
then
15155 -- Do a minimal analysis of the generic, to prevent spurious
15156 -- warnings complaining about the generic being unreferenced,
15157 -- before abandoning the instantiation.
15159 Perform_Appropriate_Analysis
(Name
(N
));
15161 if Is_Entity_Name
(Name
(N
))
15162 and then Etype
(Name
(N
)) /= Any_Type
15164 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
15165 Set_Is_Instantiated
(Entity
(Name
(N
)));
15168 if Present
(Cur
) then
15170 -- For the case of a child instance hiding an outer homonym,
15171 -- provide additional warning which might explain the error.
15173 Set_Is_Immediately_Visible
(Cur
, Vis
);
15175 ("& hides outer unit with the same name??",
15176 N
, Defining_Unit_Name
(N
));
15179 Abandon_Instantiation
(Act
);
15186 if Present
(Cur
) then
15187 Set_Is_Immediately_Visible
(Cur
, Vis
);
15189 end Preanalyze_Actuals
;
15191 -------------------------------
15192 -- Provide_Completing_Bodies --
15193 -------------------------------
15195 procedure Provide_Completing_Bodies
(N
: Node_Id
) is
15196 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
);
15197 -- Generate the completing body for subprogram declaration Subp_Decl
15199 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
);
15200 -- Generating completing bodies for all subprograms found in declarative
15203 ---------------------------
15204 -- Build_Completing_Body --
15205 ---------------------------
15207 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
) is
15208 Loc
: constant Source_Ptr
:= Sloc
(Subp_Decl
);
15209 Subp_Id
: constant Entity_Id
:= Defining_Entity
(Subp_Decl
);
15213 -- Nothing to do if the subprogram already has a completing body
15215 if Present
(Corresponding_Body
(Subp_Decl
)) then
15218 -- Mark the function as having a valid return statement even though
15219 -- the body contains a single raise statement.
15221 elsif Ekind
(Subp_Id
) = E_Function
then
15222 Set_Return_Present
(Subp_Id
);
15225 -- Clone the specification to obtain new entities and reset the only
15228 Spec
:= Copy_Subprogram_Spec
(Specification
(Subp_Decl
));
15229 Set_Generic_Parent
(Spec
, Empty
);
15232 -- function Func ... return ... is
15234 -- procedure Proc ... is
15236 -- raise Program_Error with "access before elaboration";
15239 Insert_After_And_Analyze
(Subp_Decl
,
15240 Make_Subprogram_Body
(Loc
,
15241 Specification
=> Spec
,
15242 Declarations
=> New_List
,
15243 Handled_Statement_Sequence
=>
15244 Make_Handled_Sequence_Of_Statements
(Loc
,
15245 Statements
=> New_List
(
15246 Make_Raise_Program_Error
(Loc
,
15247 Reason
=> PE_Access_Before_Elaboration
)))));
15248 end Build_Completing_Body
;
15250 ----------------------------------
15251 -- Provide_Completing_Bodies_In --
15252 ----------------------------------
15254 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
) is
15258 if Present
(Decls
) then
15259 Decl
:= First
(Decls
);
15260 while Present
(Decl
) loop
15261 Provide_Completing_Bodies
(Decl
);
15265 end Provide_Completing_Bodies_In
;
15271 -- Start of processing for Provide_Completing_Bodies
15274 if Nkind
(N
) = N_Package_Declaration
then
15275 Spec
:= Specification
(N
);
15277 Push_Scope
(Defining_Entity
(N
));
15278 Provide_Completing_Bodies_In
(Visible_Declarations
(Spec
));
15279 Provide_Completing_Bodies_In
(Private_Declarations
(Spec
));
15282 elsif Nkind
(N
) = N_Subprogram_Declaration
then
15283 Build_Completing_Body
(N
);
15285 end Provide_Completing_Bodies
;
15287 -------------------
15288 -- Remove_Parent --
15289 -------------------
15291 procedure Remove_Parent
(In_Body
: Boolean := False) is
15292 S
: Entity_Id
:= Current_Scope
;
15293 -- S is the scope containing the instantiation just completed. The scope
15294 -- stack contains the parent instances of the instantiation, followed by
15303 -- After child instantiation is complete, remove from scope stack the
15304 -- extra copy of the current scope, and then remove parent instances.
15306 if not In_Body
then
15309 while Current_Scope
/= S
loop
15310 P
:= Current_Scope
;
15311 End_Package_Scope
(Current_Scope
);
15313 if In_Open_Scopes
(P
) then
15314 E
:= First_Entity
(P
);
15315 while Present
(E
) loop
15316 Set_Is_Immediately_Visible
(E
, True);
15320 -- If instantiation is declared in a block, it is the enclosing
15321 -- scope that might be a parent instance. Note that only one
15322 -- block can be involved, because the parent instances have
15323 -- been installed within it.
15325 if Ekind
(P
) = E_Block
then
15326 Cur_P
:= Scope
(P
);
15331 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
15332 -- We are within an instance of some sibling. Retain
15333 -- visibility of parent, for proper subsequent cleanup, and
15334 -- reinstall private declarations as well.
15336 Set_In_Private_Part
(P
);
15337 Install_Private_Declarations
(P
);
15340 -- If the ultimate parent is a top-level unit recorded in
15341 -- Instance_Parent_Unit, then reset its visibility to what it was
15342 -- before instantiation. (It's not clear what the purpose is of
15343 -- testing whether Scope (P) is In_Open_Scopes, but that test was
15344 -- present before the ultimate parent test was added.???)
15346 elsif not In_Open_Scopes
(Scope
(P
))
15347 or else (P
= Instance_Parent_Unit
15348 and then not Parent_Unit_Visible
)
15350 Set_Is_Immediately_Visible
(P
, False);
15352 -- If the current scope is itself an instantiation of a generic
15353 -- nested within P, and we are in the private part of body of this
15354 -- instantiation, restore the full views of P, that were removed
15355 -- in End_Package_Scope above. This obscure case can occur when a
15356 -- subunit of a generic contains an instance of a child unit of
15357 -- its generic parent unit.
15359 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
)
15360 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
15363 Par
: constant Entity_Id
:=
15364 Generic_Parent
(Package_Specification
(S
));
15367 and then P
= Scope
(Par
)
15369 Set_In_Private_Part
(P
);
15370 Install_Private_Declarations
(P
);
15376 -- Reset visibility of entities in the enclosing scope
15378 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
15380 Hidden
:= First_Elmt
(Hidden_Entities
);
15381 while Present
(Hidden
) loop
15382 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
15383 Next_Elmt
(Hidden
);
15387 -- Each body is analyzed separately, and there is no context that
15388 -- needs preserving from one body instance to the next, so remove all
15389 -- parent scopes that have been installed.
15391 while Present
(S
) loop
15392 End_Package_Scope
(S
);
15393 Set_Is_Immediately_Visible
(S
, False);
15394 S
:= Current_Scope
;
15395 exit when S
= Standard_Standard
;
15400 -----------------------------------
15401 -- Requires_Conformance_Checking --
15402 -----------------------------------
15404 function Requires_Conformance_Checking
(N
: Node_Id
) return Boolean is
15406 -- No conformance checking required if the generic actual part is empty,
15407 -- or is a box or an others_clause (necessarily with a box).
15409 return Present
(Generic_Associations
(N
))
15410 and then not Box_Present
(N
)
15411 and then Nkind
(First
(Generic_Associations
(N
))) /= N_Others_Choice
;
15412 end Requires_Conformance_Checking
;
15418 procedure Restore_Env
is
15419 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
15422 if No
(Current_Instantiated_Parent
.Act_Id
) then
15423 -- Restore environment after subprogram inlining
15425 Restore_Private_Views
(Empty
);
15428 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
15429 Exchanged_Views
:= Saved
.Exchanged_Views
;
15430 Hidden_Entities
:= Saved
.Hidden_Entities
;
15431 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
15432 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
15433 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
15435 Restore_Config_Switches
(Saved
.Switches
);
15437 Instance_Envs
.Decrement_Last
;
15440 ---------------------------
15441 -- Restore_Private_Views --
15442 ---------------------------
15444 procedure Restore_Private_Views
15445 (Pack_Id
: Entity_Id
;
15446 Is_Package
: Boolean := True)
15451 Dep_Elmt
: Elmt_Id
;
15454 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
15455 -- Hide the generic formals of formal packages declared with box which
15456 -- were reachable in the current instantiation.
15458 ---------------------------
15459 -- Restore_Nested_Formal --
15460 ---------------------------
15462 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
15463 pragma Assert
(Ekind
(Formal
) = E_Package
);
15466 if Present
(Renamed_Entity
(Formal
))
15467 and then Denotes_Formal_Package
(Renamed_Entity
(Formal
), True)
15471 elsif Present
(Associated_Formal_Package
(Formal
)) then
15472 Ent
:= First_Entity
(Formal
);
15473 while Present
(Ent
) loop
15474 exit when Ekind
(Ent
) = E_Package
15475 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
15477 Set_Is_Hidden
(Ent
);
15478 Set_Is_Potentially_Use_Visible
(Ent
, False);
15480 -- If package, then recurse
15482 if Ekind
(Ent
) = E_Package
then
15483 Restore_Nested_Formal
(Ent
);
15489 end Restore_Nested_Formal
;
15491 -- Start of processing for Restore_Private_Views
15494 M
:= First_Elmt
(Exchanged_Views
);
15495 while Present
(M
) loop
15498 -- Subtypes of types whose views have been exchanged, and that are
15499 -- defined within the instance, were not on the Private_Dependents
15500 -- list on entry to the instance, so they have to be exchanged
15501 -- explicitly now, in order to remain consistent with the view of the
15504 if Ekind
(Typ
) in E_Private_Type
15505 | E_Limited_Private_Type
15506 | E_Record_Type_With_Private
15508 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
15509 while Present
(Dep_Elmt
) loop
15510 Dep_Typ
:= Node
(Dep_Elmt
);
15512 if Scope
(Dep_Typ
) = Pack_Id
15513 and then Present
(Full_View
(Dep_Typ
))
15515 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
15516 Exchange_Declarations
(Dep_Typ
);
15519 Next_Elmt
(Dep_Elmt
);
15523 Exchange_Declarations
(Typ
);
15527 if No
(Pack_Id
) then
15531 -- Make the generic formal parameters private, and make the formal types
15532 -- into subtypes of the actuals again.
15534 E
:= First_Entity
(Pack_Id
);
15535 while Present
(E
) loop
15536 Set_Is_Hidden
(E
, True);
15539 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
15541 -- Always preserve the flag Is_Generic_Actual_Type for GNATprove,
15542 -- as it is needed to identify the subtype with the type it
15543 -- renames, when there are conversions between access types
15546 if GNATprove_Mode
then
15549 -- If the actual for E is itself a generic actual type from
15550 -- an enclosing instance, E is still a generic actual type
15551 -- outside of the current instance. This matter when resolving
15552 -- an overloaded call that may be ambiguous in the enclosing
15553 -- instance, when two of its actuals coincide.
15555 elsif Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
15556 and then Is_Generic_Actual_Type
15557 (Entity
(Subtype_Indication
(Parent
(E
))))
15561 Set_Is_Generic_Actual_Type
(E
, False);
15563 -- It might seem reasonable to clear the Is_Generic_Actual_Type
15564 -- flag also on the Full_View if the type is private, since it
15565 -- was set also on this Full_View. However, this flag is relied
15566 -- upon by Covers to spot "types exported from instantiations"
15567 -- which are implicit Full_Views built for instantiations made
15568 -- on private types and we get type mismatches if we do it when
15569 -- the block exchanging the declarations below triggers ???
15571 -- if Is_Private_Type (E) and then Present (Full_View (E)) then
15572 -- Set_Is_Generic_Actual_Type (Full_View (E), False);
15576 -- An unusual case of aliasing: the actual may also be directly
15577 -- visible in the generic, and be private there, while it is fully
15578 -- visible in the context of the instance. The internal subtype
15579 -- is private in the instance but has full visibility like its
15580 -- parent in the enclosing scope. This enforces the invariant that
15581 -- the privacy status of all private dependents of a type coincide
15582 -- with that of the parent type. This can only happen when a
15583 -- generic child unit is instantiated within a sibling.
15585 if Is_Private_Type
(E
)
15586 and then not Is_Private_Type
(Etype
(E
))
15588 Exchange_Declarations
(E
);
15591 elsif Ekind
(E
) = E_Package
then
15593 -- The end of the renaming list is the renaming of the generic
15594 -- package itself. If the instance is a subprogram, all entities
15595 -- in the corresponding package are renamings. If this entity is
15596 -- a formal package, make its own formals private as well. The
15597 -- actual in this case is itself the renaming of an instantiation.
15598 -- If the entity is not a package renaming, it is the entity
15599 -- created to validate formal package actuals: ignore it.
15601 -- If the actual is itself a formal package for the enclosing
15602 -- generic, or the actual for such a formal package, it remains
15603 -- visible on exit from the instance, and therefore nothing needs
15604 -- to be done either, except to keep it accessible.
15606 if Is_Package
and then Renamed_Entity
(E
) = Pack_Id
then
15609 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
15613 Denotes_Formal_Package
(Renamed_Entity
(E
), True, Pack_Id
)
15615 Set_Is_Hidden
(E
, False);
15619 Act_P
: constant Entity_Id
:= Renamed_Entity
(E
);
15623 Id
:= First_Entity
(Act_P
);
15625 and then Id
/= First_Private_Entity
(Act_P
)
15627 exit when Ekind
(Id
) = E_Package
15628 and then Renamed_Entity
(Id
) = Act_P
;
15630 Set_Is_Hidden
(Id
, True);
15631 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
15633 if Ekind
(Id
) = E_Package
then
15634 Restore_Nested_Formal
(Id
);
15645 end Restore_Private_Views
;
15652 (Gen_Unit
: Entity_Id
;
15653 Act_Unit
: Entity_Id
)
15657 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
15660 ----------------------------
15661 -- Save_Global_References --
15662 ----------------------------
15664 procedure Save_Global_References
(Templ
: Node_Id
) is
15666 -- ??? it is horrible to use global variables in highly recursive code
15669 -- The entity of the current associated node
15671 Gen_Scope
: Entity_Id
;
15672 -- The scope of the generic for which references are being saved
15675 -- The current associated node
15677 function Is_Global
(E
: Entity_Id
) return Boolean;
15678 -- Check whether entity is defined outside of generic unit. Examine the
15679 -- scope of an entity, and the scope of the scope, etc, until we find
15680 -- either Standard, in which case the entity is global, or the generic
15681 -- unit itself, which indicates that the entity is local. If the entity
15682 -- is the generic unit itself, as in the case of a recursive call, or
15683 -- the enclosing generic unit, if different from the current scope, then
15684 -- it is local as well, because it will be replaced at the point of
15685 -- instantiation. On the other hand, if it is a reference to a child
15686 -- unit of a common ancestor, which appears in an instantiation, it is
15687 -- global because it is used to denote a specific compilation unit at
15688 -- the time the instantiations will be analyzed.
15690 procedure Qualify_Universal_Operands
15692 Func_Call
: Node_Id
);
15693 -- Op denotes a binary or unary operator in generic template Templ. Node
15694 -- Func_Call is the function call alternative of the operator within the
15695 -- the analyzed copy of the template. Change each operand which yields a
15696 -- universal type by wrapping it into a qualified expression
15698 -- Actual_Typ'(Operand)
15700 -- where Actual_Typ is the type of corresponding actual parameter of
15701 -- Operand in Func_Call.
15703 procedure Reset_Entity
(N
: Node_Id
);
15704 -- Save semantic information on global entity so that it is not resolved
15705 -- again at instantiation time.
15707 procedure Save_Entity_Descendants
(N
: Node_Id
);
15708 -- Apply Save_Global_References to the two syntactic descendants of
15709 -- non-terminal nodes that carry an Associated_Node and are processed
15710 -- through Reset_Entity. Once the global entity (if any) has been
15711 -- captured together with its type, only two syntactic descendants need
15712 -- to be traversed to complete the processing of the tree rooted at N.
15713 -- This applies to Selected_Components, Expanded_Names, and to Operator
15714 -- nodes. N can also be a character literal, identifier, or operator
15715 -- symbol node, but the call has no effect in these cases.
15717 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
);
15718 -- Default actuals in nested instances must be handled specially
15719 -- because there is no link to them from the original tree. When an
15720 -- actual subprogram is given by a default, we add an explicit generic
15721 -- association for it in the instantiation node. When we save the
15722 -- global references on the name of the instance, we recover the list
15723 -- of generic associations, and add an explicit one to the original
15724 -- generic tree, through which a global actual can be preserved.
15725 -- Similarly, if a child unit is instantiated within a sibling, in the
15726 -- context of the parent, we must preserve the identifier of the parent
15727 -- so that it can be properly resolved in a subsequent instantiation.
15729 procedure Save_Global_Descendant
(D
: Union_Id
);
15730 -- Apply Save_References recursively to the descendants of node D
15732 procedure Save_References
(N
: Node_Id
);
15733 -- This is the recursive procedure that does the work, once the
15734 -- enclosing generic scope has been established.
15736 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
15737 -- If the type of N2 is global to the generic unit, save the type in
15738 -- the generic node. Just as we perform name capture for explicit
15739 -- references within the generic, we must capture the global types
15740 -- of local entities because they may participate in resolution in
15747 function Is_Global
(E
: Entity_Id
) return Boolean is
15750 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
15751 -- Determine whether the parent node of a reference to a child unit
15752 -- denotes an instantiation or a formal package, in which case the
15753 -- reference to the child unit is global, even if it appears within
15754 -- the current scope (e.g. when the instance appears within the body
15755 -- of an ancestor).
15757 ----------------------
15758 -- Is_Instance_Node --
15759 ----------------------
15761 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
15763 return Nkind
(Decl
) in N_Generic_Instantiation
15765 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
15766 end Is_Instance_Node
;
15768 -- Start of processing for Is_Global
15771 if E
= Gen_Scope
then
15774 elsif E
= Standard_Standard
then
15777 -- E should be an entity, but it is not always
15779 elsif Nkind
(E
) not in N_Entity
then
15782 elsif Nkind
(E
) /= N_Expanded_Name
15783 and then Is_Child_Unit
(E
)
15784 and then (Is_Instance_Node
(Parent
(N2
))
15785 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
15786 and then N2
= Selector_Name
(Parent
(N2
))
15788 Is_Instance_Node
(Parent
(Parent
(N2
)))))
15793 -- E may be an expanded name - typically an operator - in which
15794 -- case we must find its enclosing scope since expanded names
15795 -- don't have corresponding scopes.
15797 if Nkind
(E
) = N_Expanded_Name
then
15798 Se
:= Find_Enclosing_Scope
(E
);
15800 -- Otherwise, E is an entity and will have Scope set
15806 while Se
/= Gen_Scope
loop
15807 if Se
= Standard_Standard
then
15818 --------------------------------
15819 -- Qualify_Universal_Operands --
15820 --------------------------------
15822 procedure Qualify_Universal_Operands
15824 Func_Call
: Node_Id
)
15826 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
);
15827 -- Rewrite operand Opnd as a qualified expression of the form
15829 -- Actual_Typ'(Opnd)
15831 -- where Actual is the corresponding actual parameter of Opnd in
15832 -- function call Func_Call.
15834 function Qualify_Type
15836 Typ
: Entity_Id
) return Node_Id
;
15837 -- Qualify type Typ by creating a selected component of the form
15839 -- Scope_Of_Typ.Typ
15841 ---------------------
15842 -- Qualify_Operand --
15843 ---------------------
15845 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
) is
15846 Loc
: constant Source_Ptr
:= Sloc
(Opnd
);
15847 Typ
: constant Entity_Id
:= Etype
(Actual
);
15852 -- Qualify the operand when it is of a universal type. Note that
15853 -- the template is unanalyzed and it is not possible to directly
15854 -- query the type. This transformation is not done when the type
15855 -- of the actual is internally generated because the type will be
15856 -- regenerated in the instance.
15858 if Yields_Universal_Type
(Opnd
)
15859 and then Comes_From_Source
(Typ
)
15860 and then not Is_Hidden
(Typ
)
15862 -- The type of the actual may be a global reference. Save this
15863 -- information by creating a reference to it.
15865 if Is_Global
(Typ
) then
15866 Mark
:= New_Occurrence_Of
(Typ
, Loc
);
15868 -- Otherwise rely on resolution to find the proper type within
15872 Mark
:= Qualify_Type
(Loc
, Typ
);
15876 Make_Qualified_Expression
(Loc
,
15877 Subtype_Mark
=> Mark
,
15878 Expression
=> Relocate_Node
(Opnd
));
15880 -- Mark the qualification to distinguish it from other source
15881 -- constructs and signal the instantiation mechanism that this
15882 -- node requires special processing. See Copy_Generic_Node for
15885 Set_Is_Qualified_Universal_Literal
(Qual
);
15887 Rewrite
(Opnd
, Qual
);
15889 end Qualify_Operand
;
15895 function Qualify_Type
15897 Typ
: Entity_Id
) return Node_Id
15899 Scop
: constant Entity_Id
:= Scope
(Typ
);
15903 Result
:= Make_Identifier
(Loc
, Chars
(Typ
));
15905 if Present
(Scop
) and then not Is_Generic_Unit
(Scop
) then
15907 Make_Selected_Component
(Loc
,
15908 Prefix
=> Make_Identifier
(Loc
, Chars
(Scop
)),
15909 Selector_Name
=> Result
);
15917 Actuals
: constant List_Id
:= Parameter_Associations
(Func_Call
);
15919 -- Start of processing for Qualify_Universal_Operands
15922 if Nkind
(Op
) in N_Binary_Op
then
15923 Qualify_Operand
(Left_Opnd
(Op
), First
(Actuals
));
15924 Qualify_Operand
(Right_Opnd
(Op
), Next
(First
(Actuals
)));
15926 elsif Nkind
(Op
) in N_Unary_Op
then
15927 Qualify_Operand
(Right_Opnd
(Op
), First
(Actuals
));
15929 end Qualify_Universal_Operands
;
15935 procedure Reset_Entity
(N
: Node_Id
) is
15936 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
15937 -- Find the ultimate ancestor of the current unit. If it is not a
15938 -- generic unit, then the name of the current unit in the prefix of
15939 -- an expanded name must be replaced with its generic homonym to
15940 -- ensure that it will be properly resolved in an instance.
15946 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
15951 while Is_Child_Unit
(Par
) loop
15952 Par
:= Scope
(Par
);
15958 -- Start of processing for Reset_Entity
15961 N2
:= Get_Associated_Node
(N
);
15964 if Present
(E
) then
15966 -- If the node is an entry call to an entry in an enclosing task,
15967 -- it is rewritten as a selected component. No global entity to
15968 -- preserve in this case, since the expansion will be redone in
15971 if Nkind
(E
) not in N_Entity
then
15972 Set_Associated_Node
(N
, Empty
);
15973 Set_Etype
(N
, Empty
);
15977 -- If the entity is an itype created as a subtype of an access
15978 -- type with a null exclusion restore source entity for proper
15979 -- visibility. The itype will be created anew in the instance.
15982 and then Ekind
(E
) = E_Access_Subtype
15983 and then Is_Entity_Name
(N
)
15984 and then Chars
(Etype
(E
)) = Chars
(N
)
15987 Set_Entity
(N2
, E
);
15991 if Is_Global
(E
) then
15992 Set_Global_Type
(N
, N2
);
15994 elsif Nkind
(N
) = N_Op_Concat
15995 and then Is_Generic_Type
(Etype
(N2
))
15996 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
15998 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
15999 and then Is_Intrinsic_Subprogram
(E
)
16003 -- Entity is local. Mark generic node as unresolved. Note that now
16004 -- it does not have an entity.
16007 Set_Associated_Node
(N
, Empty
);
16008 Set_Etype
(N
, Empty
);
16011 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
16012 and then N
= Name
(Parent
(N
))
16014 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
16017 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16018 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
16020 -- In case of previous errors, the tree might be malformed
16022 if No
(Entity
(Parent
(N2
))) then
16025 elsif Is_Global
(Entity
(Parent
(N2
))) then
16026 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16027 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
16028 Set_Global_Type
(Parent
(N
), Parent
(N2
));
16029 Save_Entity_Descendants
(N
);
16031 -- If this is a reference to the current generic entity, replace
16032 -- by the name of the generic homonym of the current package. This
16033 -- is because in an instantiation Par.P.Q will not resolve to the
16034 -- name of the instance, whose enclosing scope is not necessarily
16035 -- Par. We use the generic homonym rather that the name of the
16036 -- generic itself because it may be hidden by a local declaration.
16038 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
16040 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
16042 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
16043 Rewrite
(Parent
(N
),
16044 Make_Identifier
(Sloc
(N
),
16046 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
16048 Rewrite
(Parent
(N
),
16049 Make_Identifier
(Sloc
(N
),
16050 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
16054 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
16055 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
16057 Save_Global_Defaults
16058 (Parent
(Parent
(N
)), Parent
(Parent
(N2
)));
16061 -- A selected component may denote a static constant that has been
16062 -- folded. If the static constant is global to the generic, capture
16063 -- its value. Otherwise the folding will happen in any instantiation.
16065 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16066 and then Nkind
(Parent
(N2
)) in N_Integer_Literal | N_Real_Literal
16068 if Present
(Entity
(Original_Node
(Parent
(N2
))))
16069 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
16071 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
16072 Set_Analyzed
(Parent
(N
), False);
16075 -- A selected component may be transformed into a parameterless
16076 -- function call. If the called entity is global, rewrite the node
16077 -- appropriately, i.e. as an extended name for the global entity.
16079 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16080 and then Nkind
(Parent
(N2
)) = N_Function_Call
16081 and then N
= Selector_Name
(Parent
(N
))
16083 if No
(Parameter_Associations
(Parent
(N2
))) then
16084 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
16085 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16086 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
16087 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
16088 Save_Entity_Descendants
(N
);
16091 Set_Is_Prefixed_Call
(Parent
(N
));
16092 Set_Associated_Node
(N
, Empty
);
16093 Set_Etype
(N
, Empty
);
16096 -- In Ada 2005, X.F may be a call to a primitive operation,
16097 -- rewritten as F (X). This rewriting will be done again in an
16098 -- instance, so keep the original node. Global entities will be
16099 -- captured as for other constructs. Indicate that this must
16100 -- resolve as a call, to prevent accidental overloading in the
16101 -- instance, if both a component and a primitive operation appear
16105 Set_Is_Prefixed_Call
(Parent
(N
));
16108 -- Entity is local. Reset in generic unit, so that node is resolved
16109 -- anew at the point of instantiation.
16112 Set_Associated_Node
(N
, Empty
);
16113 Set_Etype
(N
, Empty
);
16117 -----------------------------
16118 -- Save_Entity_Descendants --
16119 -----------------------------
16121 procedure Save_Entity_Descendants
(N
: Node_Id
) is
16124 when N_Binary_Op
=>
16125 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
16126 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16129 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16131 when N_Expanded_Name
16132 | N_Selected_Component
16134 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
16135 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
16137 when N_Character_Literal
16139 | N_Operator_Symbol
16144 raise Program_Error
;
16146 end Save_Entity_Descendants
;
16148 --------------------------
16149 -- Save_Global_Defaults --
16150 --------------------------
16152 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
) is
16153 Loc
: constant Source_Ptr
:= Sloc
(N1
);
16154 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
16155 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
16162 Actual
: Entity_Id
;
16165 Assoc1
:= Generic_Associations
(N1
);
16167 if Present
(Assoc1
) then
16168 Act1
:= First
(Assoc1
);
16171 Set_Generic_Associations
(N1
, New_List
);
16172 Assoc1
:= Generic_Associations
(N1
);
16175 if Present
(Assoc2
) then
16176 Act2
:= First
(Assoc2
);
16181 while Present
(Act1
) and then Present
(Act2
) loop
16186 -- Find the associations added for default subprograms
16188 if Present
(Act2
) then
16189 while Nkind
(Act2
) /= N_Generic_Association
16190 or else No
(Entity
(Selector_Name
(Act2
)))
16191 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
16196 -- Add a similar association if the default is global. The
16197 -- renaming declaration for the actual has been analyzed, and
16198 -- its alias is the program it renames. Link the actual in the
16199 -- original generic tree with the node in the analyzed tree.
16201 while Present
(Act2
) loop
16202 Subp
:= Entity
(Selector_Name
(Act2
));
16203 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
16205 -- Following test is defence against rubbish errors
16207 if No
(Alias
(Subp
)) then
16211 -- Retrieve the resolved actual from the renaming declaration
16212 -- created for the instantiated formal.
16214 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
16215 Set_Entity
(Def
, Actual
);
16216 Set_Etype
(Def
, Etype
(Actual
));
16218 if Is_Global
(Actual
) then
16220 Make_Generic_Association
(Loc
,
16222 New_Occurrence_Of
(Subp
, Loc
),
16223 Explicit_Generic_Actual_Parameter
=>
16224 New_Occurrence_Of
(Actual
, Loc
));
16226 Set_Associated_Node
16227 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
16229 Append
(Ndec
, Assoc1
);
16231 -- If there are other defaults, add a dummy association in case
16232 -- there are other defaulted formals with the same name.
16234 elsif Present
(Next
(Act2
)) then
16236 Make_Generic_Association
(Loc
,
16238 New_Occurrence_Of
(Subp
, Loc
),
16239 Explicit_Generic_Actual_Parameter
=> Empty
);
16241 Append
(Ndec
, Assoc1
);
16248 if Nkind
(Name
(N1
)) = N_Identifier
16249 and then Is_Child_Unit
(Gen_Id
)
16250 and then Is_Global
(Gen_Id
)
16251 and then Is_Generic_Unit
(Scope
(Gen_Id
))
16252 and then In_Open_Scopes
(Scope
(Gen_Id
))
16254 -- This is an instantiation of a child unit within a sibling, so
16255 -- that the generic parent is in scope. An eventual instance must
16256 -- occur within the scope of an instance of the parent. Make name
16257 -- in instance into an expanded name, to preserve the identifier
16258 -- of the parent, so it can be resolved subsequently.
16260 Rewrite
(Name
(N2
),
16261 Make_Expanded_Name
(Loc
,
16262 Chars
=> Chars
(Gen_Id
),
16263 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16264 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16265 Set_Entity
(Name
(N2
), Gen_Id
);
16267 Rewrite
(Name
(N1
),
16268 Make_Expanded_Name
(Loc
,
16269 Chars
=> Chars
(Gen_Id
),
16270 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16271 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16273 Set_Associated_Node
(Name
(N1
), Name
(N2
));
16274 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
16275 Set_Associated_Node
16276 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
16277 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
16279 end Save_Global_Defaults
;
16281 ----------------------------
16282 -- Save_Global_Descendant --
16283 ----------------------------
16285 procedure Save_Global_Descendant
(D
: Union_Id
) is
16289 if D
in Node_Range
then
16290 if D
= Union_Id
(Empty
) then
16293 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
16294 Save_References
(Node_Id
(D
));
16297 elsif D
in List_Range
then
16298 pragma Assert
(D
/= Union_Id
(No_List
));
16299 -- Because No_List = Empty, which is in Node_Range above
16301 N1
:= First
(List_Id
(D
));
16302 while Present
(N1
) loop
16303 Save_References
(N1
);
16307 -- Element list or other non-node field, nothing to do
16312 end Save_Global_Descendant
;
16314 ---------------------
16315 -- Save_References --
16316 ---------------------
16318 -- This is the recursive procedure that does the work once the enclosing
16319 -- generic scope has been established. We have to treat specially a
16320 -- number of node rewritings that are required by semantic processing
16321 -- and which change the kind of nodes in the generic copy: typically
16322 -- constant-folding, replacing an operator node by a string literal, or
16323 -- a selected component by an expanded name. In each of those cases, the
16324 -- transformation is propagated to the generic unit.
16326 procedure Save_References
(N
: Node_Id
) is
16327 Loc
: constant Source_Ptr
:= Sloc
(N
);
16329 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean;
16330 -- Determine whether arbitrary node Nod requires delayed capture of
16331 -- global references within its aspect specifications.
16333 procedure Save_References_In_Aggregate
(N
: Node_Id
);
16334 -- Save all global references in [extension] aggregate node N
16336 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
);
16337 -- Save all global references in a character literal or operator
16338 -- symbol denoted by N.
16340 procedure Save_References_In_Descendants
(N
: Node_Id
);
16341 -- Save all global references in all descendants of node N
16343 procedure Save_References_In_Identifier
(N
: Node_Id
);
16344 -- Save all global references in identifier node N
16346 procedure Save_References_In_Operator
(N
: Node_Id
);
16347 -- Save all global references in operator node N
16349 procedure Save_References_In_Pragma
(Prag
: Node_Id
);
16350 -- Save all global references found within the expression of pragma
16353 ---------------------------
16354 -- Requires_Delayed_Save --
16355 ---------------------------
16357 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean is
16359 -- Generic packages and subprograms require delayed capture of
16360 -- global references within their aspects due to the timing of
16361 -- annotation analysis.
16363 if Nkind
(Nod
) in N_Generic_Package_Declaration
16364 | N_Generic_Subprogram_Declaration
16366 | N_Package_Body_Stub
16367 | N_Subprogram_Body
16368 | N_Subprogram_Body_Stub
16370 -- Since the capture of global references is done on the
16371 -- unanalyzed generic template, there is no information around
16372 -- to infer the context. Use the Associated_Entity linkages to
16373 -- peek into the analyzed generic copy and determine what the
16374 -- template corresponds to.
16376 if Nod
= Templ
then
16378 Is_Generic_Declaration_Or_Body
16379 (Unit_Declaration_Node
16380 (Associated_Entity
(Defining_Entity
(Nod
))));
16382 -- Otherwise the generic unit being processed is not the top
16383 -- level template. It is safe to capture of global references
16384 -- within the generic unit because at this point the top level
16385 -- copy is fully analyzed.
16391 -- Otherwise capture the global references without interference
16396 end Requires_Delayed_Save
;
16398 ----------------------------------
16399 -- Save_References_In_Aggregate --
16400 ----------------------------------
16402 procedure Save_References_In_Aggregate
(N
: Node_Id
) is
16404 Qual
: Node_Id
:= Empty
;
16405 Typ
: Entity_Id
:= Empty
;
16408 N2
:= Get_Associated_Node
(N
);
16410 if Present
(N2
) then
16413 -- In an instance within a generic, use the name of the actual
16414 -- and not the original generic parameter. If the actual is
16415 -- global in the current generic it must be preserved for its
16418 if Parent_Kind
(Typ
) = N_Subtype_Declaration
16419 and then Present
(Generic_Parent_Type
(Parent
(Typ
)))
16421 Typ
:= Base_Type
(Typ
);
16422 Set_Etype
(N2
, Typ
);
16426 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
16427 Set_Associated_Node
(N
, Empty
);
16429 -- If the aggregate is an actual in a call, it has been
16430 -- resolved in the current context, to some local type. The
16431 -- enclosing call may have been disambiguated by the aggregate,
16432 -- and this disambiguation might fail at instantiation time
16433 -- because the type to which the aggregate did resolve is not
16434 -- preserved. In order to preserve some of this information,
16435 -- wrap the aggregate in a qualified expression, using the id
16436 -- of its type. For further disambiguation we qualify the type
16437 -- name with its scope (if visible and not hidden by a local
16438 -- homograph) because both id's will have corresponding
16439 -- entities in an instance. This resolves most of the problems
16440 -- with missing type information on aggregates in instances.
16443 and then Nkind
(N2
) = Nkind
(N
)
16444 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
16445 and then Present
(Typ
)
16446 and then Comes_From_Source
(Typ
)
16448 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
16450 if Is_Immediately_Visible
(Scope
(Typ
))
16452 (not In_Open_Scopes
(Scope
(Typ
))
16453 or else Current_Entity
(Scope
(Typ
)) = Scope
(Typ
))
16456 Make_Selected_Component
(Loc
,
16458 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
16459 Selector_Name
=> Nam
);
16463 Make_Qualified_Expression
(Loc
,
16464 Subtype_Mark
=> Nam
,
16465 Expression
=> Relocate_Node
(N
));
16469 if Nkind
(N
) = N_Aggregate
then
16470 Save_Global_Descendant
(Union_Id
(Aggregate_Bounds
(N
)));
16472 elsif Nkind
(N
) = N_Extension_Aggregate
then
16473 Save_Global_Descendant
(Union_Id
(Ancestor_Part
(N
)));
16476 pragma Assert
(False);
16479 Save_Global_Descendant
(Union_Id
(Expressions
(N
)));
16480 Save_Global_Descendant
(Union_Id
(Component_Associations
(N
)));
16481 Save_Global_Descendant
(Union_Id
(Etype
(N
)));
16483 if Present
(Qual
) then
16486 end Save_References_In_Aggregate
;
16488 ----------------------------------------------
16489 -- Save_References_In_Char_Lit_Or_Op_Symbol --
16490 ----------------------------------------------
16492 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
) is
16494 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16497 elsif Nkind
(N
) = N_Operator_Symbol
16498 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
16500 Change_Operator_Symbol_To_String_Literal
(N
);
16502 end Save_References_In_Char_Lit_Or_Op_Symbol
;
16504 ------------------------------------
16505 -- Save_References_In_Descendants --
16506 ------------------------------------
16508 procedure Save_References_In_Descendants
(N
: Node_Id
) is
16509 procedure Walk
is new Walk_Sinfo_Fields
(Save_Global_Descendant
);
16512 end Save_References_In_Descendants
;
16514 -----------------------------------
16515 -- Save_References_In_Identifier --
16516 -----------------------------------
16518 procedure Save_References_In_Identifier
(N
: Node_Id
) is
16520 -- The node did not undergo a transformation
16522 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16523 -- If this is a discriminant reference, always save it.
16524 -- It is used in the instance to find the corresponding
16525 -- discriminant positionally rather than by name.
16527 Set_Original_Discriminant
16528 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
16532 -- The analysis of the generic copy transformed the identifier
16533 -- into another construct. Propagate the changes to the template.
16536 N2
:= Get_Associated_Node
(N
);
16538 -- The identifier denotes a call to a parameterless function.
16539 -- Mark the node as resolved when the function is external.
16541 if Nkind
(N2
) = N_Function_Call
then
16542 E
:= Entity
(Name
(N2
));
16544 if Present
(E
) and then Is_Global
(E
) then
16545 Set_Global_Type
(N
, N2
);
16547 Set_Associated_Node
(N
, Empty
);
16548 Set_Etype
(N
, Empty
);
16551 -- The identifier denotes a named number that was constant
16552 -- folded. Preserve the original name for ASIS and undo the
16553 -- constant folding which will be repeated in the instance.
16554 -- Is this still needed???
16556 elsif Nkind
(N2
) in N_Integer_Literal | N_Real_Literal
16557 and then Is_Entity_Name
(Original_Node
(N2
))
16559 Set_Associated_Node
(N
, Original_Node
(N2
));
16562 -- The identifier resolved to a string literal. Propagate this
16563 -- information to the generic template.
16565 elsif Nkind
(N2
) = N_String_Literal
then
16566 Rewrite
(N
, New_Copy
(N2
));
16568 -- The identifier is rewritten as a dereference if it is the
16569 -- prefix of an implicit dereference. Preserve the original
16570 -- tree as the analysis of the instance will expand the node
16571 -- again, but preserve the resolved entity if it is global.
16573 elsif Nkind
(N2
) = N_Explicit_Dereference
then
16574 if Is_Entity_Name
(Prefix
(N2
))
16575 and then Present
(Entity
(Prefix
(N2
)))
16576 and then Is_Global
(Entity
(Prefix
(N2
)))
16578 Set_Associated_Node
(N
, Prefix
(N2
));
16579 Set_Global_Type
(N
, Prefix
(N2
));
16581 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
16582 and then Is_Entity_Name
(Name
(Prefix
(N2
)))
16583 and then Present
(Entity
(Name
(Prefix
(N2
))))
16584 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
16587 Make_Explicit_Dereference
(Loc
,
16589 Make_Function_Call
(Loc
,
16592 (Entity
(Name
(Prefix
(N2
))), Loc
))));
16593 Set_Associated_Node
16594 (Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
16595 Set_Global_Type
(Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
16598 Set_Associated_Node
(N
, Empty
);
16599 Set_Etype
(N
, Empty
);
16602 -- The subtype mark of a nominally unconstrained object is
16603 -- rewritten as a subtype indication using the bounds of the
16604 -- expression. Recover the original subtype mark.
16606 elsif Nkind
(N2
) = N_Subtype_Indication
16607 and then Is_Entity_Name
(Original_Node
(N2
))
16609 Set_Associated_Node
(N
, Original_Node
(N2
));
16613 end Save_References_In_Identifier
;
16615 ---------------------------------
16616 -- Save_References_In_Operator --
16617 ---------------------------------
16619 procedure Save_References_In_Operator
(N
: Node_Id
) is
16621 N2
:= Get_Associated_Node
(N
);
16623 -- The node did not undergo a transformation
16625 if Nkind
(N
) = Nkind
(N2
) then
16626 if Nkind
(N
) = N_Op_Concat
then
16627 Set_Is_Component_Left_Opnd
16628 (N
, Is_Component_Left_Opnd
(N2
));
16629 Set_Is_Component_Right_Opnd
16630 (N
, Is_Component_Right_Opnd
(N2
));
16635 -- The analysis of the generic copy transformed the operator into
16636 -- some other construct. Propagate the changes to the template if
16640 -- The operator resoved to a function call
16642 if Nkind
(N2
) = N_Function_Call
then
16644 -- Add explicit qualifications in the generic template for
16645 -- all operands of universal type. This aids resolution by
16646 -- preserving the actual type of a literal or an attribute
16647 -- that yields a universal result.
16649 Qualify_Universal_Operands
(N
, N2
);
16651 E
:= Entity
(Name
(N2
));
16653 if Present
(E
) and then Is_Global
(E
) then
16654 Set_Global_Type
(N
, N2
);
16656 Set_Associated_Node
(N
, Empty
);
16657 Set_Etype
(N
, Empty
);
16660 -- The operator was folded into a literal
16662 elsif Nkind
(N2
) in N_Integer_Literal
16666 if Present
(Original_Node
(N2
))
16667 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
16669 -- Operation was constant-folded. Whenever possible,
16670 -- recover semantic information from unfolded node.
16671 -- This was initially done for ASIS but is apparently
16672 -- needed also for e.g. compiling a-nbnbin.adb.
16674 Set_Associated_Node
(N
, Original_Node
(N2
));
16676 if Nkind
(N
) = N_Op_Concat
then
16677 Set_Is_Component_Left_Opnd
(N
,
16678 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
16679 Set_Is_Component_Right_Opnd
(N
,
16680 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
16685 -- Propagate the constant folding back to the template
16688 Rewrite
(N
, New_Copy
(N2
));
16689 Set_Analyzed
(N
, False);
16692 -- The operator was folded into an enumeration literal. Retain
16693 -- the entity to avoid spurious ambiguities if it is overloaded
16694 -- at the point of instantiation or inlining.
16696 elsif Nkind
(N2
) = N_Identifier
16697 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
16699 Rewrite
(N
, New_Copy
(N2
));
16700 Set_Analyzed
(N
, False);
16704 -- Complete the operands check if node has not been constant
16707 if Nkind
(N
) in N_Op
then
16708 Save_Entity_Descendants
(N
);
16710 end Save_References_In_Operator
;
16712 -------------------------------
16713 -- Save_References_In_Pragma --
16714 -------------------------------
16716 procedure Save_References_In_Pragma
(Prag
: Node_Id
) is
16718 Do_Save
: Boolean := True;
16721 -- Do not save global references in pragmas generated from aspects
16722 -- because the pragmas will be regenerated at instantiation time.
16724 if From_Aspect_Specification
(Prag
) then
16727 -- The capture of global references within contract-related source
16728 -- pragmas associated with generic packages, subprograms or their
16729 -- respective bodies must be delayed due to timing of annotation
16730 -- analysis. Global references are still captured in routine
16731 -- Save_Global_References_In_Contract.
16733 elsif Is_Generic_Contract_Pragma
(Prag
) and then Prag
/= Templ
then
16734 if Is_Package_Contract_Annotation
(Prag
) then
16735 Context
:= Find_Related_Package_Or_Body
(Prag
);
16737 pragma Assert
(Is_Subprogram_Contract_Annotation
(Prag
));
16738 Context
:= Find_Related_Declaration_Or_Body
(Prag
);
16741 -- The use of Original_Node accounts for the case when the
16742 -- related context is generic template.
16744 if Requires_Delayed_Save
(Original_Node
(Context
)) then
16749 -- For all other cases, save all global references within the
16750 -- descendants, but skip the following semantic fields:
16751 -- Next_Pragma, Corresponding_Aspect, Next_Rep_Item.
16754 Save_Global_Descendant
16755 (Union_Id
(Pragma_Argument_Associations
(N
)));
16756 Save_Global_Descendant
(Union_Id
(Pragma_Identifier
(N
)));
16758 end Save_References_In_Pragma
;
16760 -- Start of processing for Save_References
16768 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
16769 Save_References_In_Aggregate
(N
);
16771 -- Character literals, operator symbols
16773 elsif Nkind
(N
) in N_Character_Literal | N_Operator_Symbol
then
16774 Save_References_In_Char_Lit_Or_Op_Symbol
(N
);
16776 -- Defining identifiers
16778 elsif Nkind
(N
) in N_Entity
then
16783 elsif Nkind
(N
) = N_Identifier
then
16784 Save_References_In_Identifier
(N
);
16788 elsif Nkind
(N
) in N_Op
then
16789 Save_References_In_Operator
(N
);
16793 elsif Nkind
(N
) = N_Pragma
then
16794 Save_References_In_Pragma
(N
);
16797 Save_References_In_Descendants
(N
);
16800 -- Save all global references found within the aspect specifications
16801 -- of the related node.
16803 if Permits_Aspect_Specifications
(N
) and then Has_Aspects
(N
) then
16805 -- The capture of global references within aspects associated with
16806 -- generic packages, subprograms or their bodies must be delayed
16807 -- due to timing of annotation analysis. Global references are
16808 -- still captured in routine Save_Global_References_In_Contract.
16810 if Requires_Delayed_Save
(N
) then
16813 -- Otherwise save all global references within the aspects
16816 Save_Global_References_In_Aspects
(N
);
16819 end Save_References
;
16821 ---------------------
16822 -- Set_Global_Type --
16823 ---------------------
16825 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
16826 Typ
: constant Entity_Id
:= Etype
(N2
);
16829 Set_Etype
(N
, Typ
);
16831 -- If the entity of N is not the associated node, this is a
16832 -- nested generic and it has an associated node as well, whose
16833 -- type is already the full view (see below). Indicate that the
16834 -- original node has a private view.
16836 if Entity
(N
) /= N2
and then Has_Private_View
(Entity
(N
)) then
16837 Set_Has_Private_View
(N
);
16840 -- If not a private type, nothing else to do
16842 if not Is_Private_Type
(Typ
) then
16845 -- If it is a derivation of a private type in a context where no
16846 -- full view is needed, nothing to do either.
16848 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
16851 -- Otherwise mark the type for flipping and use the full view when
16855 Set_Has_Private_View
(N
);
16857 if Present
(Full_View
(Typ
)) then
16858 Set_Etype
(N2
, Full_View
(Typ
));
16862 if Is_Floating_Point_Type
(Typ
)
16863 and then Has_Dimension_System
(Typ
)
16865 Copy_Dimensions
(N2
, N
);
16867 end Set_Global_Type
;
16869 -- Start of processing for Save_Global_References
16872 Gen_Scope
:= Current_Scope
;
16874 -- If the generic unit is a child unit, references to entities in the
16875 -- parent are treated as local, because they will be resolved anew in
16876 -- the context of the instance of the parent.
16878 while Is_Child_Unit
(Gen_Scope
)
16879 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
16881 Gen_Scope
:= Scope
(Gen_Scope
);
16884 Save_References
(Templ
);
16885 end Save_Global_References
;
16887 ---------------------------------------
16888 -- Save_Global_References_In_Aspects --
16889 ---------------------------------------
16891 procedure Save_Global_References_In_Aspects
(N
: Node_Id
) is
16896 Asp
:= First
(Aspect_Specifications
(N
));
16897 while Present
(Asp
) loop
16898 Expr
:= Expression
(Asp
);
16900 if Present
(Expr
) then
16901 Save_Global_References
(Expr
);
16906 end Save_Global_References_In_Aspects
;
16908 ------------------------------------------
16909 -- Set_Copied_Sloc_For_Inherited_Pragma --
16910 ------------------------------------------
16912 procedure Set_Copied_Sloc_For_Inherited_Pragma
16917 Create_Instantiation_Source
(N
, E
,
16918 Inlined_Body
=> False,
16919 Inherited_Pragma
=> True,
16920 Factor
=> S_Adjustment
);
16921 end Set_Copied_Sloc_For_Inherited_Pragma
;
16923 --------------------------------------
16924 -- Set_Copied_Sloc_For_Inlined_Body --
16925 --------------------------------------
16927 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
16929 Create_Instantiation_Source
(N
, E
,
16930 Inlined_Body
=> True,
16931 Inherited_Pragma
=> False,
16932 Factor
=> S_Adjustment
);
16933 end Set_Copied_Sloc_For_Inlined_Body
;
16935 ---------------------
16936 -- Set_Instance_Of --
16937 ---------------------
16939 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
16941 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
16942 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
16943 Generic_Renamings
.Increment_Last
;
16944 end Set_Instance_Of
;
16946 --------------------
16947 -- Set_Next_Assoc --
16948 --------------------
16950 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
16952 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
16953 end Set_Next_Assoc
;
16955 -------------------
16956 -- Start_Generic --
16957 -------------------
16959 procedure Start_Generic
is
16961 -- ??? More things could be factored out in this routine.
16962 -- Should probably be done at a later stage.
16964 Generic_Flags
.Append
(Inside_A_Generic
);
16965 Inside_A_Generic
:= True;
16967 Expander_Mode_Save_And_Set
(False);
16970 ----------------------
16971 -- Set_Instance_Env --
16972 ----------------------
16974 -- WARNING: This routine manages SPARK regions
16976 procedure Set_Instance_Env
16977 (Gen_Unit
: Entity_Id
;
16978 Act_Unit
: Entity_Id
)
16980 Saved_AE
: constant Boolean := Assertions_Enabled
;
16981 Saved_CPL
: constant Node_Id
:= Check_Policy_List
;
16982 Saved_DEC
: constant Boolean := Dynamic_Elaboration_Checks
;
16983 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
16984 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
16987 -- Regardless of the current mode, predefined units are analyzed in the
16988 -- most current Ada mode, and earlier version Ada checks do not apply
16989 -- to predefined units. Nothing needs to be done for non-internal units.
16990 -- These are always analyzed in the current mode.
16992 if In_Internal_Unit
(Gen_Unit
) then
16994 -- The following call resets all configuration attributes to default
16995 -- or the xxx_Config versions of the attributes when the current sem
16996 -- unit is the main unit. At the same time, internal units must also
16997 -- inherit certain configuration attributes from their context. It
16998 -- is unclear what these two sets are.
17000 Set_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
17002 -- Reinstall relevant configuration attributes of the context
17004 Assertions_Enabled
:= Saved_AE
;
17005 Check_Policy_List
:= Saved_CPL
;
17006 Dynamic_Elaboration_Checks
:= Saved_DEC
;
17008 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
17011 Current_Instantiated_Parent
:=
17012 (Gen_Id
=> Gen_Unit
,
17013 Act_Id
=> Act_Unit
,
17014 Next_In_HTable
=> Assoc_Null
);
17015 end Set_Instance_Env
;
17021 procedure Switch_View
(T
: Entity_Id
) is
17022 BT
: constant Entity_Id
:= Base_Type
(T
);
17023 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
17024 Priv_Sub
: Entity_Id
;
17027 -- T may be private but its base type may have been exchanged through
17028 -- some other occurrence, in which case there is nothing to switch
17029 -- besides T itself. Note that a private dependent subtype of a private
17030 -- type might not have been switched even if the base type has been,
17031 -- because of the last branch of Check_Private_View (see comment there).
17033 if not Is_Private_Type
(BT
) then
17034 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
17035 Exchange_Declarations
(T
);
17039 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
17041 if Present
(Full_View
(BT
)) then
17042 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
17043 Exchange_Declarations
(BT
);
17046 while Present
(Priv_Elmt
) loop
17047 Priv_Sub
:= Node
(Priv_Elmt
);
17049 if Present
(Full_View
(Priv_Sub
)) then
17050 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
17051 Exchange_Declarations
(Priv_Sub
);
17054 Next_Elmt
(Priv_Elmt
);
17062 function True_Parent
(N
: Node_Id
) return Node_Id
is
17064 if Nkind
(Parent
(N
)) = N_Subunit
then
17065 return Parent
(Corresponding_Stub
(Parent
(N
)));
17071 -----------------------------
17072 -- Valid_Default_Attribute --
17073 -----------------------------
17075 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
17076 Attr_Id
: constant Attribute_Id
:=
17077 Get_Attribute_Id
(Attribute_Name
(Def
));
17078 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
17079 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
17085 if No
(T
) or else T
= Any_Id
then
17090 F
:= First_Formal
(Nam
);
17091 while Present
(F
) loop
17092 Num_F
:= Num_F
+ 1;
17097 when Attribute_Adjacent
17098 | Attribute_Ceiling
17099 | Attribute_Copy_Sign
17101 | Attribute_Fraction
17102 | Attribute_Machine
17104 | Attribute_Remainder
17105 | Attribute_Rounding
17106 | Attribute_Unbiased_Rounding
17110 and then Is_Floating_Point_Type
(T
);
17112 when Attribute_Image
17116 | Attribute_Wide_Image
17117 | Attribute_Wide_Value
17119 OK
:= Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
);
17124 OK
:= Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
);
17126 when Attribute_Input
=>
17127 OK
:= (Is_Fun
and then Num_F
= 1);
17129 when Attribute_Output
17130 | Attribute_Put_Image
17134 OK
:= not Is_Fun
and then Num_F
= 2;
17142 ("attribute reference has wrong profile for subprogram", Def
);
17144 end Valid_Default_Attribute
;
17146 ----------------------------------
17147 -- Validate_Formal_Type_Default --
17148 ----------------------------------
17150 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
) is
17151 Default
: constant Node_Id
:=
17152 Default_Subtype_Mark
(Original_Node
(Decl
));
17153 Formal
: constant Entity_Id
:= Defining_Identifier
(Decl
);
17155 Def_Sub
: Entity_Id
; -- Default subtype mark
17156 Type_Def
: Node_Id
;
17158 procedure Check_Discriminated_Formal
;
17159 -- Check that discriminants of default for private or incomplete
17160 -- type match those of formal type.
17162 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
;
17163 -- Check whether formal type definition mentions a previous formal
17164 -- type of the same generic.
17166 ----------------------
17167 -- Reference_Formal --
17168 ----------------------
17170 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
is
17172 if Is_Entity_Name
(N
)
17173 and then Scope
(Entity
(N
)) = Current_Scope
17179 end Reference_Formal
;
17181 function Depends_On_Other_Formals
is
17182 new Traverse_Func
(Reference_Formal
);
17184 function Default_Subtype_Matches
17185 (Gen_T
, Def_T
: Entity_Id
) return Boolean;
17187 procedure Validate_Array_Type_Default
;
17188 -- Verify that dimension, indices, and component types of default
17189 -- are compatible with formal array type definition.
17191 procedure Validate_Derived_Type_Default
;
17192 -- Verify that ancestor and progenitor types match.
17194 ---------------------------------
17195 -- Check_Discriminated_Formal --
17196 ---------------------------------
17198 procedure Check_Discriminated_Formal
is
17199 Formal_Discr
: Entity_Id
;
17200 Actual_Discr
: Entity_Id
;
17201 Formal_Subt
: Entity_Id
;
17204 if Has_Discriminants
(Formal
) then
17205 if not Has_Discriminants
(Def_Sub
) then
17207 ("default for & must have discriminants", Default
, Formal
);
17209 elsif Is_Constrained
(Def_Sub
) then
17211 ("default for & must be unconstrained", Default
, Formal
);
17214 Formal_Discr
:= First_Discriminant
(Formal
);
17215 Actual_Discr
:= First_Discriminant
(Def_Sub
);
17216 while Formal_Discr
/= Empty
loop
17217 if Actual_Discr
= Empty
then
17219 ("discriminants on Formal do not match formal",
17223 Formal_Subt
:= Etype
(Formal_Discr
);
17225 -- Access discriminants match if designated types do
17227 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
17228 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
17229 E_Anonymous_Access_Type
17231 Designated_Type
(Base_Type
(Formal_Subt
)) =
17232 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
17236 elsif Base_Type
(Formal_Subt
) /=
17237 Base_Type
(Etype
(Actual_Discr
))
17240 ("types of discriminants of default must match formal",
17243 elsif not Subtypes_Statically_Match
17244 (Formal_Subt
, Etype
(Actual_Discr
))
17245 and then Ada_Version
>= Ada_95
17248 ("subtypes of discriminants of default "
17249 & "must match formal",
17253 Next_Discriminant
(Formal_Discr
);
17254 Next_Discriminant
(Actual_Discr
);
17257 if Actual_Discr
/= Empty
then
17259 ("discriminants on default do not match formal",
17264 end Check_Discriminated_Formal
;
17266 ---------------------------
17267 -- Default_Subtype_Matches --
17268 ---------------------------
17270 function Default_Subtype_Matches
17271 (Gen_T
, Def_T
: Entity_Id
) return Boolean
17274 -- Check that the base types, root types (when dealing with class
17275 -- wide types), or designated types (when dealing with anonymous
17276 -- access types) of Gen_T and Def_T are statically matching subtypes.
17278 return (Base_Type
(Gen_T
) = Base_Type
(Def_T
)
17279 and then Subtypes_Statically_Match
(Gen_T
, Def_T
))
17281 or else (Is_Class_Wide_Type
(Gen_T
)
17282 and then Is_Class_Wide_Type
(Def_T
)
17283 and then Default_Subtype_Matches
17284 (Root_Type
(Gen_T
), Root_Type
(Def_T
)))
17286 or else (Is_Anonymous_Access_Type
(Gen_T
)
17287 and then Ekind
(Def_T
) = Ekind
(Gen_T
)
17288 and then Subtypes_Statically_Match
17289 (Designated_Type
(Gen_T
), Designated_Type
(Def_T
)));
17291 end Default_Subtype_Matches
;
17293 ----------------------------------
17294 -- Validate_Array_Type_Default --
17295 ----------------------------------
17297 procedure Validate_Array_Type_Default
is
17301 if not Is_Array_Type
(Def_Sub
) then
17302 Error_Msg_NE
("default for& must be an array type ",
17306 elsif Number_Dimensions
(Def_Sub
) /= Number_Dimensions
(Formal
)
17307 or else Is_Constrained
(Def_Sub
) /=
17308 Is_Constrained
(Formal
)
17310 Error_Msg_NE
("default array type does not match&",
17315 I1
:= First_Index
(Formal
);
17316 I2
:= First_Index
(Def_Sub
);
17317 for J
in 1 .. Number_Dimensions
(Formal
) loop
17319 -- If the indexes of the actual were given by a subtype_mark,
17320 -- the index was transformed into a range attribute. Retrieve
17321 -- the original type mark for checking.
17323 if Is_Entity_Name
(Original_Node
(I2
)) then
17324 T2
:= Entity
(Original_Node
(I2
));
17329 if not Subtypes_Statically_Match
(Etype
(I1
), T2
) then
17331 ("index types of default do not match those of formal &",
17339 if not Default_Subtype_Matches
17340 (Component_Type
(Formal
), Component_Type
(Def_Sub
))
17343 ("component subtype of default does not match that of formal &",
17347 if Has_Aliased_Components
(Formal
)
17348 and then not Has_Aliased_Components
(Default
)
17351 ("default must have aliased components to match formal type &",
17354 end Validate_Array_Type_Default
;
17356 -----------------------------------
17357 -- Validate_Derived_Type_Default --
17358 -----------------------------------
17360 procedure Validate_Derived_Type_Default
is
17362 if not Is_Ancestor
(Etype
(Formal
), Def_Sub
) then
17363 Error_Msg_NE
("default must be a descendent of&",
17364 Default
, Etype
(Formal
));
17367 if Has_Interfaces
(Formal
) then
17368 if not Has_Interfaces
(Def_Sub
) then
17370 ("default must implement all interfaces of formal&",
17376 Iface_Ent
: Entity_Id
;
17379 Iface
:= First
(Abstract_Interface_List
(Formal
));
17381 while Present
(Iface
) loop
17382 Iface_Ent
:= Entity
(Iface
);
17384 if Is_Ancestor
(Iface_Ent
, Def_Sub
)
17385 or else Is_Progenitor
(Iface_Ent
, Def_Sub
)
17391 ("Default must implement interface&",
17392 Default
, Etype
(Iface
));
17400 end Validate_Derived_Type_Default
;
17402 -- Start of processing for Validate_Formal_Type_Default
17406 if not Is_Entity_Name
(Default
)
17407 or else not Is_Type
(Entity
(Default
))
17410 ("Expect type name for default of formal type", Default
);
17413 Def_Sub
:= Entity
(Default
);
17416 -- Formal derived_type declarations are transformed into full
17417 -- type declarations or Private_Type_Extensions for ease of processing.
17419 if Nkind
(Decl
) = N_Full_Type_Declaration
then
17420 Type_Def
:= Type_Definition
(Decl
);
17422 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
17423 Type_Def
:= Subtype_Indication
(Decl
);
17426 Type_Def
:= Formal_Type_Definition
(Decl
);
17429 if Depends_On_Other_Formals
(Type_Def
) = Abandon
17430 and then Scope
(Def_Sub
) /= Current_Scope
17432 Error_Msg_N
("default of formal type that depends on "
17433 & "other formals must be a previous formal type", Default
);
17436 elsif Def_Sub
= Formal
then
17438 ("default for formal type cannot be formal itsef", Default
);
17442 case Nkind
(Type_Def
) is
17444 when N_Formal_Private_Type_Definition
=>
17445 if (Is_Abstract_Type
(Formal
)
17446 and then not Is_Abstract_Type
(Def_Sub
))
17447 or else (Is_Limited_Type
(Formal
)
17448 and then not Is_Limited_Type
(Def_Sub
))
17451 ("default for private type$ does not match",
17455 Check_Discriminated_Formal
;
17457 when N_Formal_Derived_Type_Definition
=>
17458 Check_Discriminated_Formal
;
17459 Validate_Derived_Type_Default
;
17461 when N_Formal_Incomplete_Type_Definition
=>
17462 if Is_Tagged_Type
(Formal
)
17463 and then not Is_Tagged_Type
(Def_Sub
)
17466 ("default for & must be a tagged type", Default
, Formal
);
17469 Check_Discriminated_Formal
;
17471 when N_Formal_Discrete_Type_Definition
=>
17472 if not Is_Discrete_Type
(Def_Sub
) then
17473 Error_Msg_NE
("default for& must be a discrete type",
17477 when N_Formal_Signed_Integer_Type_Definition
=>
17478 if not Is_Integer_Type
(Def_Sub
) then
17479 Error_Msg_NE
("default for& must be a discrete type",
17483 when N_Formal_Modular_Type_Definition
=>
17484 if not Is_Modular_Integer_Type
(Def_Sub
) then
17485 Error_Msg_NE
("default for& must be a modular_integer Type",
17489 when N_Formal_Floating_Point_Definition
=>
17490 if not Is_Floating_Point_Type
(Def_Sub
) then
17491 Error_Msg_NE
("default for& must be a floating_point type",
17495 when N_Formal_Ordinary_Fixed_Point_Definition
=>
17496 if not Is_Ordinary_Fixed_Point_Type
(Def_Sub
) then
17497 Error_Msg_NE
("default for& must be "
17498 & "an ordinary_fixed_point type ",
17502 when N_Formal_Decimal_Fixed_Point_Definition
=>
17503 if not Is_Decimal_Fixed_Point_Type
(Def_Sub
) then
17504 Error_Msg_NE
("default for& must be "
17505 & "an Decimal_fixed_point type ",
17509 when N_Array_Type_Definition
=>
17510 Validate_Array_Type_Default
;
17512 when N_Access_Function_Definition |
17513 N_Access_Procedure_Definition
=>
17514 if Ekind
(Def_Sub
) /= E_Access_Subprogram_Type
then
17515 Error_Msg_NE
("default for& must be an Access_To_Subprogram",
17518 Check_Subtype_Conformant
17519 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
));
17521 when N_Access_To_Object_Definition
=>
17522 if not Is_Access_Object_Type
(Def_Sub
) then
17523 Error_Msg_NE
("default for& must be an Access_To_Object",
17526 elsif not Default_Subtype_Matches
17527 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
))
17529 Error_Msg_NE
("designated type of defaul does not match "
17530 & "designated type of formal type",
17534 when N_Record_Definition
=> -- Formal interface type
17535 if not Is_Interface
(Def_Sub
) then
17537 ("default for formal interface type must be an interface",
17540 elsif Is_Limited_Type
(Def_Sub
) /= Is_Limited_Type
(Formal
)
17541 or else Is_Task_Interface
(Formal
) /= Is_Task_Interface
(Def_Sub
)
17542 or else Is_Protected_Interface
(Formal
) /=
17543 Is_Protected_Interface
(Def_Sub
)
17544 or else Is_Synchronized_Interface
(Formal
) /=
17545 Is_Synchronized_Interface
(Def_Sub
)
17548 ("default for interface& does not match", Def_Sub
, Formal
);
17551 when N_Derived_Type_Definition
=>
17552 Validate_Derived_Type_Default
;
17554 when N_Identifier
=> -- case of a private extension
17555 Validate_Derived_Type_Default
;
17561 raise Program_Error
;
17563 end Validate_Formal_Type_Default
;