1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2021, 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 Contract_Cases
265 -- Initial_Condition Depends
266 -- Initializes Extensions_Visible
269 -- Refined_State Post_Class
277 -- Subprogram_Variant
280 -- Most package contract annotations utilize forward references to classify
281 -- data declared within the package [body]. Subprogram annotations then use
282 -- the classifications to further refine them. These inter dependencies are
283 -- problematic with respect to the implementation of generics because their
284 -- analysis, capture of global references and instantiation does not mesh
285 -- well with the existing mechanism.
287 -- 1) Analysis of generic contracts is carried out the same way non-generic
288 -- contracts are analyzed:
290 -- 1.1) General rule - a contract is analyzed after all related aspects
291 -- and pragmas are analyzed. This is done by routines
293 -- Analyze_Package_Body_Contract
294 -- Analyze_Package_Contract
295 -- Analyze_Subprogram_Body_Contract
296 -- Analyze_Subprogram_Contract
298 -- 1.2) Compilation unit - the contract is analyzed after Pragmas_After
301 -- 1.3) Compilation unit body - the contract is analyzed at the end of
302 -- the body declaration list.
304 -- 1.4) Package - the contract is analyzed at the end of the private or
305 -- visible declarations, prior to analyzing the contracts of any nested
306 -- packages or subprograms.
308 -- 1.5) Package body - the contract is analyzed at the end of the body
309 -- declaration list, prior to analyzing the contracts of any nested
310 -- packages or subprograms.
312 -- 1.6) Subprogram - if the subprogram is declared inside a block, a
313 -- package or a subprogram, then its contract is analyzed at the end of
314 -- the enclosing declarations, otherwise the subprogram is a compilation
317 -- 1.7) Subprogram body - if the subprogram body is declared inside a
318 -- block, a package body or a subprogram body, then its contract is
319 -- analyzed at the end of the enclosing declarations, otherwise the
320 -- subprogram is a compilation unit 1.3).
322 -- 2) Capture of global references within contracts is done after capturing
323 -- global references within the generic template. There are two reasons for
324 -- this delay - pragma annotations are not part of the generic template in
325 -- the case of a generic subprogram declaration, and analysis of contracts
328 -- Contract-related source pragmas within generic templates are prepared
329 -- for delayed capture of global references by routine
331 -- Create_Generic_Contract
333 -- The routine associates these pragmas with the contract of the template.
334 -- In the case of a generic subprogram declaration, the routine creates
335 -- generic templates for the pragmas declared after the subprogram because
336 -- they are not part of the template.
338 -- generic -- template starts
339 -- procedure Gen_Proc (Input : Integer); -- template ends
340 -- pragma Precondition (Input > 0); -- requires own template
342 -- 2.1) The capture of global references with aspect specifications and
343 -- source pragmas that apply to a generic unit must be suppressed when
344 -- the generic template is being processed because the contracts have not
345 -- been analyzed yet. Any attempts to capture global references at that
346 -- point will destroy the Associated_Node linkages and leave the template
347 -- undecorated. This delay is controlled by routine
349 -- Requires_Delayed_Save
351 -- 2.2) The real capture of global references within a contract is done
352 -- after the contract has been analyzed, by routine
354 -- Save_Global_References_In_Contract
356 -- 3) The instantiation of a generic contract occurs as part of the
357 -- instantiation of the contract owner. Generic subprogram declarations
358 -- require additional processing when the contract is specified by pragmas
359 -- because the pragmas are not part of the generic template. This is done
362 -- Instantiate_Subprogram_Contract
364 --------------------------------------------------
365 -- Formal packages and partial parameterization --
366 --------------------------------------------------
368 -- When compiling a generic, a formal package is a local instantiation. If
369 -- declared with a box, its generic formals are visible in the enclosing
370 -- generic. If declared with a partial list of actuals, those actuals that
371 -- are defaulted (covered by an Others clause, or given an explicit box
372 -- initialization) are also visible in the enclosing generic, while those
373 -- that have a corresponding actual are not.
375 -- In our source model of instantiation, the same visibility must be
376 -- present in the spec and body of an instance: the names of the formals
377 -- that are defaulted must be made visible within the instance, and made
378 -- invisible (hidden) after the instantiation is complete, so that they
379 -- are not accessible outside of the instance.
381 -- In a generic, a formal package is treated like a special instantiation.
382 -- Our Ada 95 compiler handled formals with and without box in different
383 -- ways. With partial parameterization, we use a single model for both.
384 -- We create a package declaration that consists of the specification of
385 -- the generic package, and a set of declarations that map the actuals
386 -- into local renamings, just as we do for bona fide instantiations. For
387 -- defaulted parameters and formals with a box, we copy directly the
388 -- declarations of the formals into this local package. The result is a
389 -- package whose visible declarations may include generic formals. This
390 -- package is only used for type checking and visibility analysis, and
391 -- never reaches the back end, so it can freely violate the placement
392 -- rules for generic formal declarations.
394 -- The list of declarations (renamings and copies of formals) is built
395 -- by Analyze_Associations, just as for regular instantiations.
397 -- At the point of instantiation, conformance checking must be applied only
398 -- to those parameters that were specified in the formals. We perform this
399 -- checking by creating another internal instantiation, this one including
400 -- only the renamings and the formals (the rest of the package spec is not
401 -- relevant to conformance checking). We can then traverse two lists: the
402 -- list of actuals in the instance that corresponds to the formal package,
403 -- and the list of actuals produced for this bogus instantiation. We apply
404 -- the conformance rules to those actuals that are not defaulted, i.e.
405 -- which still appear as generic formals.
407 -- When we compile an instance body we must make the right parameters
408 -- visible again. The predicate Is_Generic_Formal indicates which of the
409 -- formals should have its Is_Hidden flag reset.
411 -----------------------
412 -- Local subprograms --
413 -----------------------
415 procedure Abandon_Instantiation
(N
: Node_Id
);
416 pragma No_Return
(Abandon_Instantiation
);
417 -- Posts an error message "instantiation abandoned" at the indicated node
418 -- and then raises the exception Instantiation_Error to do it.
420 procedure Analyze_Formal_Array_Type
421 (T
: in out Entity_Id
;
423 -- A formal array type is treated like an array type declaration, and
424 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
425 -- in-out, because in the case of an anonymous type the entity is
426 -- actually created in the procedure.
428 -- The following procedures treat other kinds of formal parameters
430 procedure Analyze_Formal_Derived_Interface_Type
435 procedure Analyze_Formal_Derived_Type
440 procedure Analyze_Formal_Interface_Type
445 -- The following subprograms create abbreviated declarations for formal
446 -- scalar types. We introduce an anonymous base of the proper class for
447 -- each of them, and define the formals as constrained first subtypes of
448 -- their bases. The bounds are expressions that are non-static in the
451 procedure Analyze_Formal_Decimal_Fixed_Point_Type
452 (T
: Entity_Id
; Def
: Node_Id
);
453 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
454 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
455 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
456 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
457 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
458 (T
: Entity_Id
; Def
: Node_Id
);
460 procedure Analyze_Formal_Private_Type
464 -- Creates a new private type, which does not require completion
466 procedure Analyze_Formal_Incomplete_Type
(T
: Entity_Id
; Def
: Node_Id
);
467 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
469 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
470 -- Analyze generic formal part
472 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
473 -- Create a new access type with the given designated type
475 function Analyze_Associations
478 F_Copy
: List_Id
) return List_Id
;
479 -- At instantiation time, build the list of associations between formals
480 -- and actuals. Each association becomes a renaming declaration for the
481 -- formal entity. F_Copy is the analyzed list of formals in the generic
482 -- copy. It is used to apply legality checks to the actuals. I_Node is the
483 -- instantiation node itself.
485 procedure Analyze_Subprogram_Instantiation
489 procedure Build_Instance_Compilation_Unit_Nodes
493 -- This procedure is used in the case where the generic instance of a
494 -- subprogram body or package body is a library unit. In this case, the
495 -- original library unit node for the generic instantiation must be
496 -- replaced by the resulting generic body, and a link made to a new
497 -- compilation unit node for the generic declaration. The argument N is
498 -- the original generic instantiation. Act_Body and Act_Decl are the body
499 -- and declaration of the instance (either package body and declaration
500 -- nodes or subprogram body and declaration nodes depending on the case).
501 -- On return, the node N has been rewritten with the actual body.
503 function Build_Subprogram_Decl_Wrapper
504 (Formal_Subp
: Entity_Id
) return Node_Id
;
505 -- Ada 2022 allows formal subprograms to carry pre/postconditions.
506 -- At the point of instantiation these contracts apply to uses of
507 -- the actual subprogram. This is implemented by creating wrapper
508 -- subprograms instead of the renamings previously used to link
509 -- formal subprograms and the corresponding actuals. If the actual
510 -- is not an entity (e.g. an attribute reference) a renaming is
511 -- created to handle the expansion of the attribute.
513 function Build_Subprogram_Body_Wrapper
514 (Formal_Subp
: Entity_Id
;
515 Actual_Name
: Node_Id
) return Node_Id
;
516 -- The body of the wrapper is a call to the actual, with the generated
517 -- pre/postconditon checks added.
519 procedure Check_Access_Definition
(N
: Node_Id
);
520 -- Subsidiary routine to null exclusion processing. Perform an assertion
521 -- check on Ada version and the presence of an access definition in N.
523 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
524 -- Apply the following to all formal packages in generic associations.
525 -- Restore the visibility of the formals of the instance that are not
526 -- defaulted (see RM 12.7 (10)). Remove the anonymous package declaration
527 -- created for formal instances that are not defaulted.
529 procedure Check_Formal_Package_Instance
530 (Formal_Pack
: Entity_Id
;
531 Actual_Pack
: Entity_Id
);
532 -- Verify that the actuals of the actual instance match the actuals of
533 -- the template for a formal package that is not declared with a box.
535 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
536 -- If the generic is a local entity and the corresponding body has not
537 -- been seen yet, flag enclosing packages to indicate that it will be
538 -- elaborated after the generic body. Subprograms declared in the same
539 -- package cannot be inlined by the front end because front-end inlining
540 -- requires a strict linear order of elaboration.
542 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
;
543 -- Check if some association between formals and actuals requires to make
544 -- visible primitives of a tagged type, and make those primitives visible.
545 -- Return the list of primitives whose visibility is modified (to restore
546 -- their visibility later through Restore_Hidden_Primitives). If no
547 -- candidate is found then return No_Elist.
549 procedure Check_Hidden_Child_Unit
551 Gen_Unit
: Entity_Id
;
552 Act_Decl_Id
: Entity_Id
);
553 -- If the generic unit is an implicit child instance within a parent
554 -- instance, we need to make an explicit test that it is not hidden by
555 -- a child instance of the same name and parent.
557 procedure Check_Generic_Actuals
558 (Instance
: Entity_Id
;
559 Is_Formal_Box
: Boolean);
560 -- Similar to previous one. Check the actuals in the instantiation,
561 -- whose views can change between the point of instantiation and the point
562 -- of instantiation of the body. In addition, mark the generic renamings
563 -- as generic actuals, so that they are not compatible with other actuals.
564 -- Recurse on an actual that is a formal package whose declaration has
567 function Contains_Instance_Of
570 N
: Node_Id
) return Boolean;
571 -- Inner is instantiated within the generic Outer. Check whether Inner
572 -- directly or indirectly contains an instance of Outer or of one of its
573 -- parents, in the case of a subunit. Each generic unit holds a list of
574 -- the entities instantiated within (at any depth). This procedure
575 -- determines whether the set of such lists contains a cycle, i.e. an
576 -- illegal circular instantiation.
578 function Denotes_Formal_Package
580 On_Exit
: Boolean := False;
581 Instance
: Entity_Id
:= Empty
) return Boolean;
582 -- Returns True if E is a formal package of an enclosing generic, or
583 -- the actual for such a formal in an enclosing instantiation. If such
584 -- a package is used as a formal in an nested generic, or as an actual
585 -- in a nested instantiation, the visibility of ITS formals should not
586 -- be modified. When called from within Restore_Private_Views, the flag
587 -- On_Exit is true, to indicate that the search for a possible enclosing
588 -- instance should ignore the current one. In that case Instance denotes
589 -- the declaration for which this is an actual. This declaration may be
590 -- an instantiation in the source, or the internal instantiation that
591 -- corresponds to the actual for a formal package.
593 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
594 -- Yields True if N1 and N2 appear in the same compilation unit,
595 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
596 -- traversal of the tree for the unit. Used to determine the placement
597 -- of freeze nodes for instance bodies that may depend on other instances.
599 function Find_Actual_Type
601 Gen_Type
: Entity_Id
) return Entity_Id
;
602 -- When validating the actual types of a child instance, check whether
603 -- the formal is a formal type of the parent unit, and retrieve the current
604 -- actual for it. Typ is the entity in the analyzed formal type declaration
605 -- (component or index type of an array type, or designated type of an
606 -- access formal) and Gen_Type is the enclosing analyzed formal array
607 -- or access type. The desired actual may be a formal of a parent, or may
608 -- be declared in a formal package of a parent. In both cases it is a
609 -- generic actual type because it appears within a visible instance.
610 -- Finally, it may be declared in a parent unit without being a formal
611 -- of that unit, in which case it must be retrieved by visibility.
612 -- Ambiguities may still arise if two homonyms are declared in two formal
613 -- packages, and the prefix of the formal type may be needed to resolve
614 -- the ambiguity in the instance ???
616 procedure Freeze_Package_Instance
621 -- If the instantiation happens textually before the body of the generic,
622 -- the instantiation of the body must be analyzed after the generic body,
623 -- and not at the point of instantiation. Such early instantiations can
624 -- happen if the generic and the instance appear in a package declaration
625 -- because the generic body can only appear in the corresponding package
626 -- body. Early instantiations can also appear if generic, instance and
627 -- body are all in the declarative part of a subprogram or entry. Entities
628 -- of packages that are early instantiations are delayed, and their freeze
629 -- node appears after the generic body. This rather complex machinery is
630 -- needed when nested instantiations are present, because the source does
631 -- not carry any indication of where the corresponding instance bodies must
632 -- be installed and frozen.
634 procedure Freeze_Subprogram_Instance
637 Pack_Id
: Entity_Id
);
638 -- The generic body may appear textually after the instance, including
639 -- in the proper body of a stub, or within a different package instance.
640 -- Given that the instance can only be elaborated after the generic, we
641 -- place freeze nodes for the instance and/or for packages that may enclose
642 -- the instance and the generic, so that the back-end can establish the
643 -- proper order of elaboration.
645 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
646 -- In order to propagate semantic information back from the analyzed copy
647 -- to the original generic, we maintain links between selected nodes in the
648 -- generic and their corresponding copies. At the end of generic analysis,
649 -- the routine Save_Global_References traverses the generic tree, examines
650 -- the semantic information, and preserves the links to those nodes that
651 -- contain global information. At instantiation, the information from the
652 -- associated node is placed on the new copy, so that name resolution is
655 -- Three kinds of source nodes have associated nodes:
657 -- a) those that can reference (denote) entities, that is identifiers,
658 -- character literals, expanded_names, operator symbols, operators,
659 -- and attribute reference nodes. These nodes have an Entity field
660 -- and are the set of nodes that are in N_Has_Entity.
662 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
664 -- c) selected components (N_Selected_Component)
666 -- For the first class, the associated node preserves the entity if it is
667 -- global. If the generic contains nested instantiations, the associated
668 -- node itself has been recopied, and a chain of them must be followed.
670 -- For aggregates, the associated node allows retrieval of the type, which
671 -- may otherwise not appear in the generic. The view of this type may be
672 -- different between generic and instantiation, and the full view can be
673 -- installed before the instantiation is analyzed. For aggregates of type
674 -- extensions, the same view exchange may have to be performed for some of
675 -- the ancestor types, if their view is private at the point of
678 -- Nodes that are selected components in the parse tree may be rewritten
679 -- as expanded names after resolution, and must be treated as potential
680 -- entity holders, which is why they also have an Associated_Node.
682 -- Nodes that do not come from source, such as freeze nodes, do not appear
683 -- in the generic tree, and need not have an associated node.
685 -- The associated node is stored in the Associated_Node field. Note that
686 -- this field overlaps Entity, which is fine, because the whole point is
687 -- that we don't need or want the normal Entity field in this situation.
689 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
690 -- Traverse the Exchanged_Views list to see if a type was private
691 -- and has already been flipped during this phase of instantiation.
693 function Has_Contracts
(Decl
: Node_Id
) return Boolean;
694 -- Determine whether a formal subprogram has a Pre- or Postcondition,
695 -- in which case a subprogram wrapper has to be built for the actual.
697 procedure Hide_Current_Scope
;
698 -- When instantiating a generic child unit, the parent context must be
699 -- present, but the instance and all entities that may be generated
700 -- must be inserted in the current scope. We leave the current scope
701 -- on the stack, but make its entities invisible to avoid visibility
702 -- problems. This is reversed at the end of the instantiation. This is
703 -- not done for the instantiation of the bodies, which only require the
704 -- instances of the generic parents to be in scope.
706 function In_Main_Context
(E
: Entity_Id
) return Boolean;
707 -- Check whether an instantiation is in the context of the main unit.
708 -- Used to determine whether its body should be elaborated to allow
709 -- front-end inlining.
711 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
712 -- Add the context clause of the unit containing a generic unit to a
713 -- compilation unit that is, or contains, an instantiation.
716 -- Establish environment for subsequent instantiation. Separated from
717 -- Save_Env because data-structures for visibility handling must be
718 -- initialized before call to Check_Generic_Child_Unit.
720 procedure Inline_Instance_Body
722 Gen_Unit
: Entity_Id
;
724 -- If front-end inlining is requested, instantiate the package body,
725 -- and preserve the visibility of its compilation unit, to insure
726 -- that successive instantiations succeed.
728 procedure Insert_Freeze_Node_For_Instance
731 -- N denotes a package or a subprogram instantiation and F_Node is the
732 -- associated freeze node. Insert the freeze node before the first source
733 -- body which follows immediately after N. If no such body is found, the
734 -- freeze node is inserted at the end of the declarative region which
735 -- contains N, unless the instantiation is done in a package spec that is
736 -- not at library level, in which case it is inserted at the outer level.
737 -- This can also be invoked to insert the freeze node of a package that
738 -- encloses an instantiation, in which case N may denote an arbitrary node.
740 procedure Install_Formal_Packages
(Par
: Entity_Id
);
741 -- Install the visible part of any formal of the parent that is a formal
742 -- package. Note that for the case of a formal package with a box, this
743 -- includes the formal part of the formal package (12.7(10/2)).
745 procedure Install_Hidden_Primitives
746 (Prims_List
: in out Elist_Id
;
749 -- Remove suffix 'P' from hidden primitives of Act_T to match the
750 -- visibility of primitives of Gen_T. The list of primitives to which
751 -- the suffix is removed is added to Prims_List to restore them later.
753 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
754 -- When compiling an instance of a child unit the parent (which is
755 -- itself an instance) is an enclosing scope that must be made
756 -- immediately visible. This procedure is also used to install the non-
757 -- generic parent of a generic child unit when compiling its body, so
758 -- that full views of types in the parent are made visible.
760 -- The functions Instantiate_XXX perform various legality checks and build
761 -- the declarations for instantiated generic parameters. In all of these
762 -- Formal is the entity in the generic unit, Actual is the entity of
763 -- expression in the generic associations, and Analyzed_Formal is the
764 -- formal in the generic copy, which contains the semantic information to
765 -- be used to validate the actual.
767 function Instantiate_Object
770 Analyzed_Formal
: Node_Id
) return List_Id
;
772 function Instantiate_Type
775 Analyzed_Formal
: Node_Id
;
776 Actual_Decls
: List_Id
) return List_Id
;
778 function Instantiate_Formal_Subprogram
781 Analyzed_Formal
: Node_Id
) return Node_Id
;
783 function Instantiate_Formal_Package
786 Analyzed_Formal
: Node_Id
) return List_Id
;
787 -- If the formal package is declared with a box, special visibility rules
788 -- apply to its formals: they are in the visible part of the package. This
789 -- is true in the declarative region of the formal package, that is to say
790 -- in the enclosing generic or instantiation. For an instantiation, the
791 -- parameters of the formal package are made visible in an explicit step.
792 -- Furthermore, if the actual has a visible USE clause, these formals must
793 -- be made potentially use-visible as well. On exit from the enclosing
794 -- instantiation, the reverse must be done.
796 -- For a formal package declared without a box, there are conformance rules
797 -- that apply to the actuals in the generic declaration and the actuals of
798 -- the actual package in the enclosing instantiation. The simplest way to
799 -- apply these rules is to repeat the instantiation of the formal package
800 -- in the context of the enclosing instance, and compare the generic
801 -- associations of this instantiation with those of the actual package.
802 -- This internal instantiation only needs to contain the renamings of the
803 -- formals: the visible and private declarations themselves need not be
806 -- In Ada 2005, the formal package may be only partially parameterized.
807 -- In that case the visibility step must make visible those actuals whose
808 -- corresponding formals were given with a box. A final complication
809 -- involves inherited operations from formal derived types, which must
810 -- be visible if the type is.
812 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
813 -- Test if given node is in the main unit
815 procedure Load_Parent_Of_Generic
818 Body_Optional
: Boolean := False);
819 -- If the generic appears in a separate non-generic library unit, load the
820 -- corresponding body to retrieve the body of the generic. N is the node
821 -- for the generic instantiation, Spec is the generic package declaration.
823 -- Body_Optional is a flag that indicates that the body is being loaded to
824 -- ensure that temporaries are generated consistently when there are other
825 -- instances in the current declarative part that precede the one being
826 -- loaded. In that case a missing body is acceptable.
828 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
829 -- Within the generic part, entities in the formal package are
830 -- visible. To validate subsequent type declarations, indicate
831 -- the correspondence between the entities in the analyzed formal,
832 -- and the entities in the actual package. There are three packages
833 -- involved in the instantiation of a formal package: the parent
834 -- generic P1 which appears in the generic declaration, the fake
835 -- instantiation P2 which appears in the analyzed generic, and whose
836 -- visible entities may be used in subsequent formals, and the actual
837 -- P3 in the instance. To validate subsequent formals, me indicate
838 -- that the entities in P2 are mapped into those of P3. The mapping of
839 -- entities has to be done recursively for nested packages.
841 procedure Move_Freeze_Nodes
845 -- Freeze nodes can be generated in the analysis of a generic unit, but
846 -- will not be seen by the back-end. It is necessary to move those nodes
847 -- to the enclosing scope if they freeze an outer entity. We place them
848 -- at the end of the enclosing generic package, which is semantically
851 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
);
852 -- Analyze actuals to perform name resolution. Full resolution is done
853 -- later, when the expected types are known, but names have to be captured
854 -- before installing parents of generics, that are not visible for the
855 -- actuals themselves.
857 -- If Inst is present, it is the entity of the package instance. This
858 -- entity is marked as having a limited_view actual when some actual is
859 -- a limited view. This is used to place the instance body properly.
861 procedure Provide_Completing_Bodies
(N
: Node_Id
);
862 -- Generate completing bodies for all subprograms found within package or
863 -- subprogram declaration N.
865 procedure Remove_Parent
(In_Body
: Boolean := False);
866 -- Reverse effect after instantiation of child is complete
868 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
869 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
872 procedure Set_Instance_Env
873 (Gen_Unit
: Entity_Id
;
874 Act_Unit
: Entity_Id
);
875 -- Save current instance on saved environment, to be used to determine
876 -- the global status of entities in nested instances. Part of Save_Env.
877 -- called after verifying that the generic unit is legal for the instance,
878 -- The procedure also examines whether the generic unit is a predefined
879 -- unit, in order to set configuration switches accordingly. As a result
880 -- the procedure must be called after analyzing and freezing the actuals.
882 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
883 -- Associate analyzed generic parameter with corresponding instance. Used
884 -- for semantic checks at instantiation time.
886 function True_Parent
(N
: Node_Id
) return Node_Id
;
887 -- For a subunit, return parent of corresponding stub, else return
890 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
891 -- Verify that an attribute that appears as the default for a formal
892 -- subprogram is a function or procedure with the correct profile.
894 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
);
895 -- Ada_2022 AI12-205: if a default subtype_mark is present, verify
896 -- that it is the name of a type in the same class as the formal.
897 -- The treatment parallels what is done in Instantiate_Type but differs
898 -- in a few ways so that this machinery cannot be reused as is: on one
899 -- hand there are no visibility issues for a default, because it is
900 -- analyzed in the same context as the formal type definition; on the
901 -- other hand the check needs to take into acount the use of a previous
902 -- formal type in the current formal type definition (see details in
905 -------------------------------------------
906 -- Data Structures for Generic Renamings --
907 -------------------------------------------
909 -- The map Generic_Renamings associates generic entities with their
910 -- corresponding actuals. Currently used to validate type instances. It
911 -- will eventually be used for all generic parameters to eliminate the
912 -- need for overload resolution in the instance.
914 type Assoc_Ptr
is new Int
;
916 Assoc_Null
: constant Assoc_Ptr
:= -1;
921 Next_In_HTable
: Assoc_Ptr
;
924 package Generic_Renamings
is new Table
.Table
925 (Table_Component_Type
=> Assoc
,
926 Table_Index_Type
=> Assoc_Ptr
,
927 Table_Low_Bound
=> 0,
929 Table_Increment
=> 100,
930 Table_Name
=> "Generic_Renamings");
932 -- Variable to hold enclosing instantiation. When the environment is
933 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
935 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
937 -- Hash table for associations
939 HTable_Size
: constant := 37;
940 type HTable_Range
is range 0 .. HTable_Size
- 1;
942 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
943 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
944 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
945 function Hash
(F
: Entity_Id
) return HTable_Range
;
947 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
948 Header_Num
=> HTable_Range
,
950 Elmt_Ptr
=> Assoc_Ptr
,
951 Null_Ptr
=> Assoc_Null
,
952 Set_Next
=> Set_Next_Assoc
,
955 Get_Key
=> Get_Gen_Id
,
959 Exchanged_Views
: Elist_Id
;
960 -- This list holds the private views that have been exchanged during
961 -- instantiation to restore the visibility of the generic declaration.
962 -- (see comments above). After instantiation, the current visibility is
963 -- reestablished by means of a traversal of this list.
965 Hidden_Entities
: Elist_Id
;
966 -- This list holds the entities of the current scope that are removed
967 -- from immediate visibility when instantiating a child unit. Their
968 -- visibility is restored in Remove_Parent.
970 -- Because instantiations can be recursive, the following must be saved
971 -- on entry and restored on exit from an instantiation (spec or body).
972 -- This is done by the two procedures Save_Env and Restore_Env. For
973 -- package and subprogram instantiations (but not for the body instances)
974 -- the action of Save_Env is done in two steps: Init_Env is called before
975 -- Check_Generic_Child_Unit, because setting the parent instances requires
976 -- that the visibility data structures be properly initialized. Once the
977 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
979 Parent_Unit_Visible
: Boolean := False;
980 -- Parent_Unit_Visible is used when the generic is a child unit, and
981 -- indicates whether the ultimate parent of the generic is visible in the
982 -- instantiation environment. It is used to reset the visibility of the
983 -- parent at the end of the instantiation (see Remove_Parent).
985 Instance_Parent_Unit
: Entity_Id
:= Empty
;
986 -- This records the ultimate parent unit of an instance of a generic
987 -- child unit and is used in conjunction with Parent_Unit_Visible to
988 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
990 type Instance_Env
is record
991 Instantiated_Parent
: Assoc
;
992 Exchanged_Views
: Elist_Id
;
993 Hidden_Entities
: Elist_Id
;
994 Current_Sem_Unit
: Unit_Number_Type
;
995 Parent_Unit_Visible
: Boolean := False;
996 Instance_Parent_Unit
: Entity_Id
:= Empty
;
997 Switches
: Config_Switches_Type
;
1000 package Instance_Envs
is new Table
.Table
(
1001 Table_Component_Type
=> Instance_Env
,
1002 Table_Index_Type
=> Int
,
1003 Table_Low_Bound
=> 0,
1004 Table_Initial
=> 32,
1005 Table_Increment
=> 100,
1006 Table_Name
=> "Instance_Envs");
1008 procedure Restore_Private_Views
1009 (Pack_Id
: Entity_Id
;
1010 Is_Package
: Boolean := True);
1011 -- Restore the private views of external types, and unmark the generic
1012 -- renamings of actuals, so that they become compatible subtypes again.
1013 -- For subprograms, Pack_Id is the package constructed to hold the
1016 procedure Switch_View
(T
: Entity_Id
);
1017 -- Switch the partial and full views of a type and its private
1018 -- dependents (i.e. its subtypes and derived types).
1020 ------------------------------------
1021 -- Structures for Error Reporting --
1022 ------------------------------------
1024 Instantiation_Node
: Node_Id
;
1025 -- Used by subprograms that validate instantiation of formal parameters
1026 -- where there might be no actual on which to place the error message.
1027 -- Also used to locate the instantiation node for generic subunits.
1029 Instantiation_Error
: exception;
1030 -- When there is a semantic error in the generic parameter matching,
1031 -- there is no point in continuing the instantiation, because the
1032 -- number of cascaded errors is unpredictable. This exception aborts
1033 -- the instantiation process altogether.
1035 S_Adjustment
: Sloc_Adjustment
;
1036 -- Offset created for each node in an instantiation, in order to keep
1037 -- track of the source position of the instantiation in each of its nodes.
1038 -- A subsequent semantic error or warning on a construct of the instance
1039 -- points to both places: the original generic node, and the point of
1040 -- instantiation. See Sinput and Sinput.L for additional details.
1042 ------------------------------------------------------------
1043 -- Data structure for keeping track when inside a Generic --
1044 ------------------------------------------------------------
1046 -- The following table is used to save values of the Inside_A_Generic
1047 -- flag (see spec of Sem) when they are saved by Start_Generic.
1049 package Generic_Flags
is new Table
.Table
(
1050 Table_Component_Type
=> Boolean,
1051 Table_Index_Type
=> Int
,
1052 Table_Low_Bound
=> 0,
1053 Table_Initial
=> 32,
1054 Table_Increment
=> 200,
1055 Table_Name
=> "Generic_Flags");
1057 ---------------------------
1058 -- Abandon_Instantiation --
1059 ---------------------------
1061 procedure Abandon_Instantiation
(N
: Node_Id
) is
1063 Error_Msg_N
("\instantiation abandoned!", N
);
1064 raise Instantiation_Error
;
1065 end Abandon_Instantiation
;
1067 ----------------------------------
1068 -- Adjust_Inherited_Pragma_Sloc --
1069 ----------------------------------
1071 procedure Adjust_Inherited_Pragma_Sloc
(N
: Node_Id
) is
1073 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1074 end Adjust_Inherited_Pragma_Sloc
;
1076 --------------------------
1077 -- Analyze_Associations --
1078 --------------------------
1080 function Analyze_Associations
1083 F_Copy
: List_Id
) return List_Id
1085 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
1086 Assoc_List
: constant List_Id
:= New_List
;
1087 Default_Actuals
: constant List_Id
:= New_List
;
1088 Gen_Unit
: constant Entity_Id
:=
1089 Defining_Entity
(Parent
(F_Copy
));
1093 Analyzed_Formal
: Node_Id
;
1094 First_Named
: Node_Id
:= Empty
;
1098 Saved_Formal
: Node_Id
;
1100 Default_Formals
: constant List_Id
:= New_List
;
1101 -- If an Others_Choice is present, some of the formals may be defaulted.
1102 -- To simplify the treatment of visibility in an instance, we introduce
1103 -- individual defaults for each such formal. These defaults are
1104 -- appended to the list of associations and replace the Others_Choice.
1106 Found_Assoc
: Node_Id
;
1107 -- Association for the current formal being match. Empty if there are
1108 -- no remaining actuals, or if there is no named association with the
1109 -- name of the formal.
1111 Is_Named_Assoc
: Boolean;
1112 Num_Matched
: Nat
:= 0;
1113 Num_Actuals
: Nat
:= 0;
1115 Others_Present
: Boolean := False;
1116 Others_Choice
: Node_Id
:= Empty
;
1117 -- In Ada 2005, indicates partial parameterization of a formal
1118 -- package. As usual an other association must be last in the list.
1120 procedure Build_Subprogram_Wrappers
;
1121 -- Ada 2022: AI12-0272 introduces pre/postconditions for formal
1122 -- subprograms. The implementation of making the formal into a renaming
1123 -- of the actual does not work, given that subprogram renaming cannot
1124 -- carry aspect specifications. Instead we must create subprogram
1125 -- wrappers whose body is a call to the actual, and whose declaration
1126 -- carries the aspects of the formal.
1128 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
);
1129 -- Warn if an actual fixed-point type has user-defined arithmetic
1130 -- operations, but there is no corresponding formal in the generic,
1131 -- in which case the predefined operations will be used. This merits
1132 -- a warning because of the special semantics of fixed point ops.
1134 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
);
1135 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1136 -- cannot have a named association for it. AI05-0025 extends this rule
1137 -- to formals of formal packages by AI05-0025, and it also applies to
1138 -- box-initialized formals.
1140 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
1141 -- Determine whether the parameter types and the return type of Subp
1142 -- are fully defined at the point of instantiation.
1144 function Matching_Actual
1146 A_F
: Entity_Id
) return Node_Id
;
1147 -- Find actual that corresponds to a given a formal parameter. If the
1148 -- actuals are positional, return the next one, if any. If the actuals
1149 -- are named, scan the parameter associations to find the right one.
1150 -- A_F is the corresponding entity in the analyzed generic, which is
1151 -- placed on the selector name.
1153 -- In Ada 2005, a named association may be given with a box, in which
1154 -- case Matching_Actual sets Found_Assoc to the generic association,
1155 -- but return Empty for the actual itself. In this case the code below
1156 -- creates a corresponding declaration for the formal.
1158 function Partial_Parameterization
return Boolean;
1159 -- Ada 2005: if no match is found for a given formal, check if the
1160 -- association for it includes a box, or whether the associations
1161 -- include an Others clause.
1163 procedure Process_Default
(F
: Entity_Id
);
1164 -- Add a copy of the declaration of generic formal F to the list of
1165 -- associations, and add an explicit box association for F if there
1166 -- is none yet, and the default comes from an Others_Choice.
1168 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1169 -- Determine whether Subp renames one of the subprograms defined in the
1170 -- generated package Standard.
1172 procedure Set_Analyzed_Formal
;
1173 -- Find the node in the generic copy that corresponds to a given formal.
1174 -- The semantic information on this node is used to perform legality
1175 -- checks on the actuals. Because semantic analysis can introduce some
1176 -- anonymous entities or modify the declaration node itself, the
1177 -- correspondence between the two lists is not one-one. In addition to
1178 -- anonymous types, the presence a formal equality will introduce an
1179 -- implicit declaration for the corresponding inequality.
1181 -----------------------------------------
1182 -- procedure Build_Subprogram_Wrappers --
1183 -----------------------------------------
1185 procedure Build_Subprogram_Wrappers
is
1186 Formal
: constant Entity_Id
:=
1187 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
1188 Aspect_Spec
: Node_Id
;
1189 Decl_Node
: Node_Id
;
1190 Actual_Name
: Node_Id
;
1193 -- Create declaration for wrapper subprogram
1194 -- The actual can be overloaded, in which case it will be
1195 -- resolved when the call in the wrapper body is analyzed.
1196 -- We attach the possible interpretations of the actual to
1197 -- the name to be used in the call in the wrapper body.
1199 if Is_Entity_Name
(Match
) then
1200 Actual_Name
:= New_Occurrence_Of
(Entity
(Match
), Sloc
(Match
));
1202 if Is_Overloaded
(Match
) then
1203 Save_Interps
(Match
, Actual_Name
);
1207 -- Use renaming declaration created when analyzing actual.
1208 -- This may be incomplete if there are several formal
1209 -- subprograms whose actual is an attribute ???
1212 Renaming_Decl
: constant Node_Id
:= Last
(Assoc_List
);
1215 Actual_Name
:= New_Occurrence_Of
1216 (Defining_Entity
(Renaming_Decl
), Sloc
(Match
));
1217 Set_Etype
(Actual_Name
, Get_Instance_Of
(Etype
(Formal
)));
1221 Decl_Node
:= Build_Subprogram_Decl_Wrapper
(Formal
);
1223 -- Transfer aspect specifications from formal subprogram to wrapper
1225 Set_Aspect_Specifications
(Decl_Node
,
1226 New_Copy_List_Tree
(Aspect_Specifications
(Analyzed_Formal
)));
1228 Aspect_Spec
:= First
(Aspect_Specifications
(Decl_Node
));
1229 while Present
(Aspect_Spec
) loop
1230 Set_Analyzed
(Aspect_Spec
, False);
1234 Append_To
(Assoc_List
, Decl_Node
);
1236 -- Create corresponding body, and append it to association list
1237 -- that appears at the head of the declarations in the instance.
1238 -- The subprogram may be called in the analysis of subsequent
1241 Append_To
(Assoc_List
,
1242 Build_Subprogram_Body_Wrapper
(Formal
, Actual_Name
));
1243 end Build_Subprogram_Wrappers
;
1245 ----------------------------------------
1246 -- Check_Overloaded_Formal_Subprogram --
1247 ----------------------------------------
1249 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
) is
1250 Temp_Formal
: Entity_Id
;
1253 Temp_Formal
:= First
(Formals
);
1254 while Present
(Temp_Formal
) loop
1255 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1256 and then Temp_Formal
/= Formal
1258 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1259 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1261 if Present
(Found_Assoc
) then
1263 ("named association not allowed for overloaded formal",
1268 ("named association not allowed for overloaded formal",
1272 Abandon_Instantiation
(Instantiation_Node
);
1277 end Check_Overloaded_Formal_Subprogram
;
1279 -------------------------------
1280 -- Check_Fixed_Point_Actual --
1281 -------------------------------
1283 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
) is
1284 Typ
: constant Entity_Id
:= Entity
(Actual
);
1285 Prims
: constant Elist_Id
:= Collect_Primitive_Operations
(Typ
);
1291 -- Locate primitive operations of the type that are arithmetic
1294 Elem
:= First_Elmt
(Prims
);
1295 while Present
(Elem
) loop
1296 if Nkind
(Node
(Elem
)) = N_Defining_Operator_Symbol
then
1298 -- Check whether the generic unit has a formal subprogram of
1299 -- the same name. This does not check types but is good enough
1300 -- to justify a warning.
1302 Formal
:= First_Non_Pragma
(Formals
);
1303 Op
:= Alias
(Node
(Elem
));
1305 while Present
(Formal
) loop
1306 if Nkind
(Formal
) = N_Formal_Concrete_Subprogram_Declaration
1307 and then Chars
(Defining_Entity
(Formal
)) =
1312 elsif Nkind
(Formal
) = N_Formal_Package_Declaration
then
1318 -- Locate corresponding actual, and check whether it
1319 -- includes a fixed-point type.
1321 Assoc
:= First
(Assoc_List
);
1322 while Present
(Assoc
) loop
1324 Nkind
(Assoc
) = N_Package_Renaming_Declaration
1325 and then Chars
(Defining_Unit_Name
(Assoc
)) =
1326 Chars
(Defining_Identifier
(Formal
));
1331 if Present
(Assoc
) then
1333 -- If formal package declares a fixed-point type,
1334 -- and the user-defined operator is derived from
1335 -- a generic instance package, the fixed-point type
1336 -- does not use the corresponding predefined op.
1338 Ent
:= First_Entity
(Entity
(Name
(Assoc
)));
1339 while Present
(Ent
) loop
1340 if Is_Fixed_Point_Type
(Ent
)
1341 and then Present
(Op
)
1342 and then Is_Generic_Instance
(Scope
(Op
))
1357 Error_Msg_Sloc
:= Sloc
(Node
(Elem
));
1359 ("?instance uses predefined operation, not primitive "
1360 & "operation&#", Actual
, Node
(Elem
));
1366 end Check_Fixed_Point_Actual
;
1368 -------------------------------
1369 -- Has_Fully_Defined_Profile --
1370 -------------------------------
1372 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1373 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1374 -- Determine whethet type Typ is fully defined
1376 ---------------------------
1377 -- Is_Fully_Defined_Type --
1378 ---------------------------
1380 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1382 -- A private type without a full view is not fully defined
1384 if Is_Private_Type
(Typ
)
1385 and then No
(Full_View
(Typ
))
1389 -- An incomplete type is never fully defined
1391 elsif Is_Incomplete_Type
(Typ
) then
1394 -- All other types are fully defined
1399 end Is_Fully_Defined_Type
;
1401 -- Local declarations
1405 -- Start of processing for Has_Fully_Defined_Profile
1408 -- Check the parameters
1410 Param
:= First_Formal
(Subp
);
1411 while Present
(Param
) loop
1412 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1416 Next_Formal
(Param
);
1419 -- Check the return type
1421 return Is_Fully_Defined_Type
(Etype
(Subp
));
1422 end Has_Fully_Defined_Profile
;
1424 ---------------------
1425 -- Matching_Actual --
1426 ---------------------
1428 function Matching_Actual
1430 A_F
: Entity_Id
) return Node_Id
1436 Is_Named_Assoc
:= False;
1438 -- End of list of purely positional parameters
1440 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1441 Found_Assoc
:= Empty
;
1444 -- Case of positional parameter corresponding to current formal
1446 elsif No
(Selector_Name
(Actual
)) then
1447 Found_Assoc
:= Actual
;
1448 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1449 Num_Matched
:= Num_Matched
+ 1;
1452 -- Otherwise scan list of named actuals to find the one with the
1453 -- desired name. All remaining actuals have explicit names.
1456 Is_Named_Assoc
:= True;
1457 Found_Assoc
:= Empty
;
1461 while Present
(Actual
) loop
1462 if Nkind
(Actual
) = N_Others_Choice
then
1463 Found_Assoc
:= Empty
;
1466 elsif Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1467 Set_Entity
(Selector_Name
(Actual
), A_F
);
1468 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1469 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1471 Found_Assoc
:= Actual
;
1472 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1473 Num_Matched
:= Num_Matched
+ 1;
1481 -- Reset for subsequent searches. In most cases the named
1482 -- associations are in order. If they are not, we reorder them
1483 -- to avoid scanning twice the same actual. This is not just a
1484 -- question of efficiency: there may be multiple defaults with
1485 -- boxes that have the same name. In a nested instantiation we
1486 -- insert actuals for those defaults, and cannot rely on their
1487 -- names to disambiguate them.
1489 if Actual
= First_Named
then
1492 elsif Present
(Actual
) then
1493 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1496 Actual
:= First_Named
;
1499 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1500 Set_Used_As_Generic_Actual
(Entity
(Act
));
1504 end Matching_Actual
;
1506 ------------------------------
1507 -- Partial_Parameterization --
1508 ------------------------------
1510 function Partial_Parameterization
return Boolean is
1512 return Others_Present
1513 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1514 end Partial_Parameterization
;
1516 ---------------------
1517 -- Process_Default --
1518 ---------------------
1520 procedure Process_Default
(F
: Entity_Id
) is
1521 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1522 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1528 -- Append copy of formal declaration to associations, and create new
1529 -- defining identifier for it.
1531 Decl
:= New_Copy_Tree
(F
);
1532 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1534 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1535 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1538 Set_Defining_Identifier
(Decl
, Id
);
1541 Append
(Decl
, Assoc_List
);
1543 if No
(Found_Assoc
) then
1545 Make_Generic_Association
(Loc
,
1547 New_Occurrence_Of
(Id
, Loc
),
1548 Explicit_Generic_Actual_Parameter
=> Empty
);
1549 Set_Box_Present
(Default
);
1550 Append
(Default
, Default_Formals
);
1552 end Process_Default
;
1554 ---------------------------------
1555 -- Renames_Standard_Subprogram --
1556 ---------------------------------
1558 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1563 while Present
(Id
) loop
1564 if Scope
(Id
) = Standard_Standard
then
1572 end Renames_Standard_Subprogram
;
1574 -------------------------
1575 -- Set_Analyzed_Formal --
1576 -------------------------
1578 procedure Set_Analyzed_Formal
is
1582 while Present
(Analyzed_Formal
) loop
1583 Kind
:= Nkind
(Analyzed_Formal
);
1585 case Nkind
(Formal
) is
1586 when N_Formal_Subprogram_Declaration
=>
1587 exit when Kind
in N_Formal_Subprogram_Declaration
1590 (Defining_Unit_Name
(Specification
(Formal
))) =
1592 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1594 when N_Formal_Package_Declaration
=>
1595 exit when Kind
in N_Formal_Package_Declaration
1596 | N_Generic_Package_Declaration
1597 | N_Package_Declaration
;
1599 when N_Use_Package_Clause
1606 -- Skip freeze nodes, and nodes inserted to replace
1607 -- unrecognized pragmas.
1610 Kind
not in N_Formal_Subprogram_Declaration
1611 and then Kind
not in N_Subprogram_Declaration
1615 and then Chars
(Defining_Identifier
(Formal
)) =
1616 Chars
(Defining_Identifier
(Analyzed_Formal
));
1619 Next
(Analyzed_Formal
);
1621 end Set_Analyzed_Formal
;
1623 -- Start of processing for Analyze_Associations
1626 Actuals
:= Generic_Associations
(I_Node
);
1628 if Present
(Actuals
) then
1630 -- Check for an Others choice, indicating a partial parameterization
1631 -- for a formal package.
1633 Actual
:= First
(Actuals
);
1634 while Present
(Actual
) loop
1635 if Nkind
(Actual
) = N_Others_Choice
then
1636 Others_Present
:= True;
1637 Others_Choice
:= Actual
;
1639 if Present
(Next
(Actual
)) then
1640 Error_Msg_N
("OTHERS must be last association", Actual
);
1643 -- This subprogram is used both for formal packages and for
1644 -- instantiations. For the latter, associations must all be
1647 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1648 and then Comes_From_Source
(I_Node
)
1651 ("OTHERS association not allowed in an instance",
1655 -- In any case, nothing to do after the others association
1659 elsif Box_Present
(Actual
)
1660 and then Comes_From_Source
(I_Node
)
1661 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1664 ("box association not allowed in an instance", Actual
);
1670 -- If named associations are present, save first named association
1671 -- (it may of course be Empty) to facilitate subsequent name search.
1673 First_Named
:= First
(Actuals
);
1674 while Present
(First_Named
)
1675 and then Nkind
(First_Named
) /= N_Others_Choice
1676 and then No
(Selector_Name
(First_Named
))
1678 Num_Actuals
:= Num_Actuals
+ 1;
1683 Named
:= First_Named
;
1684 while Present
(Named
) loop
1685 if Nkind
(Named
) /= N_Others_Choice
1686 and then No
(Selector_Name
(Named
))
1688 Error_Msg_N
("invalid positional actual after named one", Named
);
1689 Abandon_Instantiation
(Named
);
1692 -- A named association may lack an actual parameter, if it was
1693 -- introduced for a default subprogram that turns out to be local
1694 -- to the outer instantiation. If it has a box association it must
1695 -- correspond to some formal in the generic.
1697 if Nkind
(Named
) /= N_Others_Choice
1698 and then (Present
(Explicit_Generic_Actual_Parameter
(Named
))
1699 or else Box_Present
(Named
))
1701 Num_Actuals
:= Num_Actuals
+ 1;
1707 if Present
(Formals
) then
1708 Formal
:= First_Non_Pragma
(Formals
);
1709 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1711 if Present
(Actuals
) then
1712 Actual
:= First
(Actuals
);
1714 -- All formals should have default values
1720 while Present
(Formal
) loop
1721 Set_Analyzed_Formal
;
1722 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1724 case Nkind
(Formal
) is
1725 when N_Formal_Object_Declaration
=>
1728 (Defining_Identifier
(Formal
),
1729 Defining_Identifier
(Analyzed_Formal
));
1731 if No
(Match
) and then Partial_Parameterization
then
1732 Process_Default
(Formal
);
1736 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1739 -- For a defaulted in_parameter, create an entry in the
1740 -- the list of defaulted actuals, for GNATprove use. Do
1741 -- not included these defaults for an instance nested
1742 -- within a generic, because the defaults are also used
1743 -- in the analysis of the enclosing generic, and only
1744 -- defaulted subprograms are relevant there.
1746 if No
(Match
) and then not Inside_A_Generic
then
1747 Append_To
(Default_Actuals
,
1748 Make_Generic_Association
(Sloc
(I_Node
),
1751 (Defining_Identifier
(Formal
), Sloc
(I_Node
)),
1752 Explicit_Generic_Actual_Parameter
=>
1753 New_Copy_Tree
(Default_Expression
(Formal
))));
1757 -- If the object is a call to an expression function, this
1758 -- is a freezing point for it.
1760 if Is_Entity_Name
(Match
)
1761 and then Present
(Entity
(Match
))
1763 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1764 = N_Expression_Function
1766 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1769 when N_Formal_Type_Declaration
=>
1772 (Defining_Identifier
(Formal
),
1773 Defining_Identifier
(Analyzed_Formal
));
1776 if Partial_Parameterization
then
1777 Process_Default
(Formal
);
1779 elsif Present
(Default_Subtype_Mark
(Formal
)) then
1780 Match
:= New_Copy
(Default_Subtype_Mark
(Formal
));
1783 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1785 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1788 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1791 Instantiation_Node
, Defining_Identifier
(Formal
));
1793 ("\in instantiation of & declared#",
1794 Instantiation_Node
, Gen_Unit
);
1795 Abandon_Instantiation
(Instantiation_Node
);
1802 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1805 -- Warn when an actual is a fixed-point with user-
1806 -- defined promitives. The warning is superfluous
1807 -- if the formal is private, because there can be
1808 -- no arithmetic operations in the generic so there
1809 -- no danger of confusion.
1811 if Is_Fixed_Point_Type
(Entity
(Match
))
1812 and then not Is_Private_Type
1813 (Defining_Identifier
(Analyzed_Formal
))
1815 Check_Fixed_Point_Actual
(Match
);
1818 -- An instantiation is a freeze point for the actuals,
1819 -- unless this is a rewritten formal package, or the
1820 -- formal is an Ada 2012 formal incomplete type.
1822 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1824 (Ada_Version
>= Ada_2012
1826 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1832 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1836 -- A remote access-to-class-wide type is not a legal actual
1837 -- for a generic formal of an access type (E.2.2(17/2)).
1838 -- In GNAT an exception to this rule is introduced when
1839 -- the formal is marked as remote using implementation
1840 -- defined aspect/pragma Remote_Access_Type. In that case
1841 -- the actual must be remote as well.
1843 -- If the current instantiation is the construction of a
1844 -- local copy for a formal package the actuals may be
1845 -- defaulted, and there is no matching actual to check.
1847 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1849 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1850 N_Access_To_Object_Definition
1851 and then Present
(Match
)
1854 Formal_Ent
: constant Entity_Id
:=
1855 Defining_Identifier
(Analyzed_Formal
);
1857 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1858 = Is_Remote_Types
(Formal_Ent
)
1860 -- Remoteness of formal and actual match
1864 elsif Is_Remote_Types
(Formal_Ent
) then
1866 -- Remote formal, non-remote actual
1869 ("actual for& must be remote", Match
, Formal_Ent
);
1872 -- Non-remote formal, remote actual
1875 ("actual for& may not be remote",
1881 when N_Formal_Subprogram_Declaration
=>
1884 (Defining_Unit_Name
(Specification
(Formal
)),
1885 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1887 -- If the formal subprogram has the same name as another
1888 -- formal subprogram of the generic, then a named
1889 -- association is illegal (12.3(9)). Exclude named
1890 -- associations that are generated for a nested instance.
1893 and then Is_Named_Assoc
1894 and then Comes_From_Source
(Found_Assoc
)
1896 Check_Overloaded_Formal_Subprogram
(Formal
);
1899 -- If there is no corresponding actual, this may be case
1900 -- of partial parameterization, or else the formal has a
1901 -- default or a box.
1903 if No
(Match
) and then Partial_Parameterization
then
1904 Process_Default
(Formal
);
1906 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1907 Check_Overloaded_Formal_Subprogram
(Formal
);
1911 Append_To
(Assoc_List
,
1912 Instantiate_Formal_Subprogram
1913 (Formal
, Match
, Analyzed_Formal
));
1915 -- If formal subprogram has contracts, create wrappers
1916 -- for it. This is an expansion activity that cannot
1917 -- take place e.g. within an enclosing generic unit.
1919 if Has_Contracts
(Analyzed_Formal
)
1920 and then Expander_Active
1922 Build_Subprogram_Wrappers
;
1925 -- An instantiation is a freeze point for the actuals,
1926 -- unless this is a rewritten formal package.
1928 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1929 and then Nkind
(Match
) = N_Identifier
1930 and then Is_Subprogram
(Entity
(Match
))
1932 -- The actual subprogram may rename a routine defined
1933 -- in Standard. Avoid freezing such renamings because
1934 -- subprograms coming from Standard cannot be frozen.
1937 not Renames_Standard_Subprogram
(Entity
(Match
))
1939 -- If the actual subprogram comes from a different
1940 -- unit, it is already frozen, either by a body in
1941 -- that unit or by the end of the declarative part
1942 -- of the unit. This check avoids the freezing of
1943 -- subprograms defined in Standard which are used
1944 -- as generic actuals.
1946 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1947 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1949 -- Mark the subprogram as having a delayed freeze
1950 -- since this may be an out-of-order action.
1952 Set_Has_Delayed_Freeze
(Entity
(Match
));
1953 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1957 -- If this is a nested generic, preserve default for later
1958 -- instantiations. We do this as well for GNATprove use,
1959 -- so that the list of generic associations is complete.
1961 if No
(Match
) and then Box_Present
(Formal
) then
1963 Subp
: constant Entity_Id
:=
1965 (Specification
(Last
(Assoc_List
)));
1968 Append_To
(Default_Actuals
,
1969 Make_Generic_Association
(Sloc
(I_Node
),
1971 New_Occurrence_Of
(Subp
, Sloc
(I_Node
)),
1972 Explicit_Generic_Actual_Parameter
=>
1973 New_Occurrence_Of
(Subp
, Sloc
(I_Node
))));
1977 when N_Formal_Package_Declaration
=>
1978 -- The name of the formal package may be hidden by the
1979 -- formal parameter itself.
1981 if Error_Posted
(Analyzed_Formal
) then
1982 Abandon_Instantiation
(Instantiation_Node
);
1987 (Defining_Identifier
(Formal
),
1989 (Original_Node
(Analyzed_Formal
)));
1993 if Partial_Parameterization
then
1994 Process_Default
(Formal
);
1997 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2000 Instantiation_Node
, Defining_Identifier
(Formal
));
2002 ("\in instantiation of & declared#",
2003 Instantiation_Node
, Gen_Unit
);
2005 Abandon_Instantiation
(Instantiation_Node
);
2011 (Instantiate_Formal_Package
2012 (Formal
, Match
, Analyzed_Formal
),
2015 -- Determine whether the actual package needs an explicit
2016 -- freeze node. This is only the case if the actual is
2017 -- declared in the same unit and has a body. Normally
2018 -- packages do not have explicit freeze nodes, and gigi
2019 -- only uses them to elaborate entities in a package
2022 Explicit_Freeze_Check
: declare
2023 Actual
: constant Entity_Id
:= Entity
(Match
);
2024 Gen_Par
: Entity_Id
;
2026 Needs_Freezing
: Boolean;
2029 procedure Check_Generic_Parent
;
2030 -- The actual may be an instantiation of a unit
2031 -- declared in a previous instantiation. If that
2032 -- one is also in the current compilation, it must
2033 -- itself be frozen before the actual. The actual
2034 -- may be an instantiation of a generic child unit,
2035 -- in which case the same applies to the instance
2036 -- of the parent which must be frozen before the
2038 -- Should this itself be recursive ???
2040 --------------------------
2041 -- Check_Generic_Parent --
2042 --------------------------
2044 procedure Check_Generic_Parent
is
2045 Inst
: constant Node_Id
:=
2046 Next
(Unit_Declaration_Node
(Actual
));
2052 if Nkind
(Parent
(Actual
)) = N_Package_Specification
2054 Par
:= Scope
(Generic_Parent
(Parent
(Actual
)));
2056 if Is_Generic_Instance
(Par
) then
2059 -- If the actual is a child generic unit, check
2060 -- whether the instantiation of the parent is
2061 -- also local and must also be frozen now. We
2062 -- must retrieve the instance node to locate the
2063 -- parent instance if any.
2065 elsif Ekind
(Par
) = E_Generic_Package
2066 and then Is_Child_Unit
(Gen_Par
)
2067 and then Ekind
(Scope
(Gen_Par
)) =
2070 if Nkind
(Inst
) = N_Package_Instantiation
2071 and then Nkind
(Name
(Inst
)) =
2074 -- Retrieve entity of parent instance
2076 Par
:= Entity
(Prefix
(Name
(Inst
)));
2085 and then Is_Generic_Instance
(Par
)
2086 and then Scope
(Par
) = Current_Scope
2088 (No
(Freeze_Node
(Par
))
2090 not Is_List_Member
(Freeze_Node
(Par
)))
2092 Set_Has_Delayed_Freeze
(Par
);
2093 Append_Elmt
(Par
, Actuals_To_Freeze
);
2095 end Check_Generic_Parent
;
2097 -- Start of processing for Explicit_Freeze_Check
2100 if Present
(Renamed_Entity
(Actual
)) then
2102 Generic_Parent
(Specification
2103 (Unit_Declaration_Node
2104 (Renamed_Entity
(Actual
))));
2107 Generic_Parent
(Specification
2108 (Unit_Declaration_Node
(Actual
)));
2111 if not Expander_Active
2112 or else not Has_Completion
(Actual
)
2113 or else not In_Same_Source_Unit
(I_Node
, Actual
)
2114 or else Is_Frozen
(Actual
)
2116 (Present
(Renamed_Entity
(Actual
))
2118 not In_Same_Source_Unit
2119 (I_Node
, (Renamed_Entity
(Actual
))))
2124 -- Finally we want to exclude such freeze nodes
2125 -- from statement sequences, which freeze
2126 -- everything before them.
2127 -- Is this strictly necessary ???
2129 Needs_Freezing
:= True;
2131 P
:= Parent
(I_Node
);
2132 while Nkind
(P
) /= N_Compilation_Unit
loop
2133 if Nkind
(P
) = N_Handled_Sequence_Of_Statements
2135 Needs_Freezing
:= False;
2142 if Needs_Freezing
then
2143 Check_Generic_Parent
;
2145 -- If the actual is a renaming of a proper
2146 -- instance of the formal package, indicate
2147 -- that it is the instance that must be frozen.
2149 if Nkind
(Parent
(Actual
)) =
2150 N_Package_Renaming_Declaration
2152 Set_Has_Delayed_Freeze
2153 (Renamed_Entity
(Actual
));
2155 (Renamed_Entity
(Actual
),
2158 Set_Has_Delayed_Freeze
(Actual
);
2159 Append_Elmt
(Actual
, Actuals_To_Freeze
);
2163 end Explicit_Freeze_Check
;
2166 -- For use type and use package appearing in the generic part,
2167 -- we have already copied them, so we can just move them where
2168 -- they belong (we mustn't recopy them since this would mess up
2169 -- the Sloc values).
2171 when N_Use_Package_Clause
2174 if Nkind
(Original_Node
(I_Node
)) =
2175 N_Formal_Package_Declaration
2177 Append
(New_Copy_Tree
(Formal
), Assoc_List
);
2180 Append
(Formal
, Assoc_List
);
2184 raise Program_Error
;
2187 Formal
:= Saved_Formal
;
2188 Next_Non_Pragma
(Analyzed_Formal
);
2191 if Num_Actuals
> Num_Matched
then
2192 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2194 if Present
(Selector_Name
(Actual
)) then
2196 ("unmatched actual &", Actual
, Selector_Name
(Actual
));
2198 ("\in instantiation of & declared#", Actual
, Gen_Unit
);
2201 ("unmatched actual in instantiation of & declared#",
2206 elsif Present
(Actuals
) then
2208 ("too many actuals in generic instantiation", Instantiation_Node
);
2211 -- An instantiation freezes all generic actuals. The only exceptions
2212 -- to this are incomplete types and subprograms which are not fully
2213 -- defined at the point of instantiation.
2216 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
2218 while Present
(Elmt
) loop
2219 Freeze_Before
(I_Node
, Node
(Elmt
));
2224 -- If there are default subprograms, normalize the tree by adding
2225 -- explicit associations for them. This is required if the instance
2226 -- appears within a generic.
2228 if not Is_Empty_List
(Default_Actuals
) then
2233 Default
:= First
(Default_Actuals
);
2234 while Present
(Default
) loop
2235 Mark_Rewrite_Insertion
(Default
);
2239 if No
(Actuals
) then
2240 Set_Generic_Associations
(I_Node
, Default_Actuals
);
2242 Append_List_To
(Actuals
, Default_Actuals
);
2247 -- If this is a formal package, normalize the parameter list by adding
2248 -- explicit box associations for the formals that are covered by an
2251 if not Is_Empty_List
(Default_Formals
) then
2252 Append_List
(Default_Formals
, Formals
);
2256 end Analyze_Associations
;
2258 -------------------------------
2259 -- Analyze_Formal_Array_Type --
2260 -------------------------------
2262 procedure Analyze_Formal_Array_Type
2263 (T
: in out Entity_Id
;
2269 -- Treated like a non-generic array declaration, with additional
2274 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2275 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2276 while Present
(DSS
) loop
2277 if Nkind
(DSS
) in N_Subtype_Indication
2279 | N_Attribute_Reference
2281 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2288 Array_Type_Declaration
(T
, Def
);
2289 Set_Is_Generic_Type
(Base_Type
(T
));
2291 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2292 and then No
(Full_View
(Component_Type
(T
)))
2294 Error_Msg_N
("premature usage of incomplete type", Def
);
2296 -- Check that range constraint is not allowed on the component type
2297 -- of a generic formal array type (AARM 12.5.3(3))
2299 elsif Is_Internal
(Component_Type
(T
))
2300 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2301 and then Nkind
(Original_Node
2302 (Subtype_Indication
(Component_Definition
(Def
)))) =
2303 N_Subtype_Indication
2306 ("in a formal, a subtype indication can only be "
2307 & "a subtype mark (RM 12.5.3(3))",
2308 Subtype_Indication
(Component_Definition
(Def
)));
2311 end Analyze_Formal_Array_Type
;
2313 ---------------------------------------------
2314 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2315 ---------------------------------------------
2317 -- As for other generic types, we create a valid type representation with
2318 -- legal but arbitrary attributes, whose values are never considered
2319 -- static. For all scalar types we introduce an anonymous base type, with
2320 -- the same attributes. We choose the corresponding integer type to be
2321 -- Standard_Integer.
2322 -- Here and in other similar routines, the Sloc of the generated internal
2323 -- type must be the same as the sloc of the defining identifier of the
2324 -- formal type declaration, to provide proper source navigation.
2326 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2330 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2332 Base
: constant Entity_Id
:=
2334 (E_Decimal_Fixed_Point_Type
,
2336 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2338 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2339 Delta_Val
: constant Ureal
:= Ureal_1
;
2340 Digs_Val
: constant Uint
:= Uint_6
;
2342 function Make_Dummy_Bound
return Node_Id
;
2343 -- Return a properly typed universal real literal to use as a bound
2345 ----------------------
2346 -- Make_Dummy_Bound --
2347 ----------------------
2349 function Make_Dummy_Bound
return Node_Id
is
2350 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2352 Set_Etype
(Bound
, Universal_Real
);
2354 end Make_Dummy_Bound
;
2356 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2361 Set_Etype
(Base
, Base
);
2362 Set_Size_Info
(Base
, Int_Base
);
2363 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2364 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2365 Set_Digits_Value
(Base
, Digs_Val
);
2366 Set_Delta_Value
(Base
, Delta_Val
);
2367 Set_Small_Value
(Base
, Delta_Val
);
2368 Set_Scalar_Range
(Base
,
2370 Low_Bound
=> Make_Dummy_Bound
,
2371 High_Bound
=> Make_Dummy_Bound
));
2373 Set_Is_Generic_Type
(Base
);
2374 Set_Parent
(Base
, Parent
(Def
));
2376 Mutate_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2377 Set_Etype
(T
, Base
);
2378 Set_Size_Info
(T
, Int_Base
);
2379 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2380 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2381 Set_Digits_Value
(T
, Digs_Val
);
2382 Set_Delta_Value
(T
, Delta_Val
);
2383 Set_Small_Value
(T
, Delta_Val
);
2384 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2385 Set_Is_Constrained
(T
);
2387 Check_Restriction
(No_Fixed_Point
, Def
);
2388 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2390 -------------------------------------------
2391 -- Analyze_Formal_Derived_Interface_Type --
2392 -------------------------------------------
2394 procedure Analyze_Formal_Derived_Interface_Type
2399 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2402 -- Rewrite as a type declaration of a derived type. This ensures that
2403 -- the interface list and primitive operations are properly captured.
2406 Make_Full_Type_Declaration
(Loc
,
2407 Defining_Identifier
=> T
,
2408 Type_Definition
=> Def
));
2410 Set_Is_Generic_Type
(T
);
2411 end Analyze_Formal_Derived_Interface_Type
;
2413 ---------------------------------
2414 -- Analyze_Formal_Derived_Type --
2415 ---------------------------------
2417 procedure Analyze_Formal_Derived_Type
2422 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2423 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2427 Set_Is_Generic_Type
(T
);
2429 if Private_Present
(Def
) then
2431 Make_Private_Extension_Declaration
(Loc
,
2432 Defining_Identifier
=> T
,
2433 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2434 Unknown_Discriminants_Present
=> Unk_Disc
,
2435 Subtype_Indication
=> Subtype_Mark
(Def
),
2436 Interface_List
=> Interface_List
(Def
));
2438 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2439 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2440 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2444 Make_Full_Type_Declaration
(Loc
,
2445 Defining_Identifier
=> T
,
2446 Discriminant_Specifications
=>
2447 Discriminant_Specifications
(Parent
(T
)),
2449 Make_Derived_Type_Definition
(Loc
,
2450 Subtype_Indication
=> Subtype_Mark
(Def
)));
2452 Set_Abstract_Present
2453 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2455 (Type_Definition
(New_N
), Limited_Present
(Def
));
2462 if not Is_Composite_Type
(T
) then
2464 ("unknown discriminants not allowed for elementary types", N
);
2466 Set_Has_Unknown_Discriminants
(T
);
2467 Set_Is_Constrained
(T
, False);
2471 -- If the parent type has a known size, so does the formal, which makes
2472 -- legal representation clauses that involve the formal.
2474 Set_Size_Known_At_Compile_Time
2475 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2476 end Analyze_Formal_Derived_Type
;
2478 ----------------------------------
2479 -- Analyze_Formal_Discrete_Type --
2480 ----------------------------------
2482 -- The operations defined for a discrete types are those of an enumeration
2483 -- type. The size is set to an arbitrary value, for use in analyzing the
2486 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2487 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2491 Base
: constant Entity_Id
:=
2493 (E_Floating_Point_Type
, Current_Scope
,
2494 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2498 Mutate_Ekind
(T
, E_Enumeration_Subtype
);
2499 Set_Etype
(T
, Base
);
2501 Reinit_Alignment
(T
);
2502 Set_Is_Generic_Type
(T
);
2503 Set_Is_Constrained
(T
);
2505 -- For semantic analysis, the bounds of the type must be set to some
2506 -- non-static value. The simplest is to create attribute nodes for those
2507 -- bounds, that refer to the type itself. These bounds are never
2508 -- analyzed but serve as place-holders.
2511 Make_Attribute_Reference
(Loc
,
2512 Attribute_Name
=> Name_First
,
2513 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2517 Make_Attribute_Reference
(Loc
,
2518 Attribute_Name
=> Name_Last
,
2519 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2522 Set_Scalar_Range
(T
,
2527 Mutate_Ekind
(Base
, E_Enumeration_Type
);
2528 Set_Etype
(Base
, Base
);
2529 Init_Size
(Base
, 8);
2530 Reinit_Alignment
(Base
);
2531 Set_Is_Generic_Type
(Base
);
2532 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2533 Set_Parent
(Base
, Parent
(Def
));
2534 end Analyze_Formal_Discrete_Type
;
2536 ----------------------------------
2537 -- Analyze_Formal_Floating_Type --
2538 ---------------------------------
2540 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2541 Base
: constant Entity_Id
:=
2543 (E_Floating_Point_Type
, Current_Scope
,
2544 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2547 -- The various semantic attributes are taken from the predefined type
2548 -- Float, just so that all of them are initialized. Their values are
2549 -- never used because no constant folding or expansion takes place in
2550 -- the generic itself.
2553 Mutate_Ekind
(T
, E_Floating_Point_Subtype
);
2554 Set_Etype
(T
, Base
);
2555 Set_Size_Info
(T
, (Standard_Float
));
2556 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2557 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2558 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2559 Set_Is_Constrained
(T
);
2561 Set_Is_Generic_Type
(Base
);
2562 Set_Etype
(Base
, Base
);
2563 Set_Size_Info
(Base
, (Standard_Float
));
2564 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2565 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2566 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2567 Set_Parent
(Base
, Parent
(Def
));
2569 Check_Restriction
(No_Floating_Point
, Def
);
2570 end Analyze_Formal_Floating_Type
;
2572 -----------------------------------
2573 -- Analyze_Formal_Interface_Type;--
2574 -----------------------------------
2576 procedure Analyze_Formal_Interface_Type
2581 Loc
: constant Source_Ptr
:= Sloc
(N
);
2586 Make_Full_Type_Declaration
(Loc
,
2587 Defining_Identifier
=> T
,
2588 Type_Definition
=> Def
);
2592 Set_Is_Generic_Type
(T
);
2593 end Analyze_Formal_Interface_Type
;
2595 ---------------------------------
2596 -- Analyze_Formal_Modular_Type --
2597 ---------------------------------
2599 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2601 -- Apart from their entity kind, generic modular types are treated like
2602 -- signed integer types, and have the same attributes.
2604 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2605 Mutate_Ekind
(T
, E_Modular_Integer_Subtype
);
2606 Mutate_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2608 end Analyze_Formal_Modular_Type
;
2610 ---------------------------------------
2611 -- Analyze_Formal_Object_Declaration --
2612 ---------------------------------------
2614 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2615 E
: constant Node_Id
:= Default_Expression
(N
);
2616 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2623 -- Determine the mode of the formal object
2625 if Out_Present
(N
) then
2626 K
:= E_Generic_In_Out_Parameter
;
2628 if not In_Present
(N
) then
2629 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2633 K
:= E_Generic_In_Parameter
;
2636 if Present
(Subtype_Mark
(N
)) then
2637 Find_Type
(Subtype_Mark
(N
));
2638 T
:= Entity
(Subtype_Mark
(N
));
2640 -- Verify that there is no redundant null exclusion
2642 if Null_Exclusion_Present
(N
) then
2643 if not Is_Access_Type
(T
) then
2645 ("null exclusion can only apply to an access type", N
);
2647 elsif Can_Never_Be_Null
(T
) then
2649 ("`NOT NULL` not allowed (& already excludes null)", N
, T
);
2653 -- Ada 2005 (AI-423): Formal object with an access definition
2656 Check_Access_Definition
(N
);
2657 T
:= Access_Definition
2659 N
=> Access_Definition
(N
));
2662 if Ekind
(T
) = E_Incomplete_Type
then
2664 Error_Node
: Node_Id
;
2667 if Present
(Subtype_Mark
(N
)) then
2668 Error_Node
:= Subtype_Mark
(N
);
2670 Check_Access_Definition
(N
);
2671 Error_Node
:= Access_Definition
(N
);
2674 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2678 if K
= E_Generic_In_Parameter
then
2680 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2682 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2684 ("generic formal of mode IN must not be of limited type", N
);
2685 Explain_Limited_Type
(T
, N
);
2688 if Is_Abstract_Type
(T
) then
2690 ("generic formal of mode IN must not be of abstract type", N
);
2694 Preanalyze_Spec_Expression
(E
, T
);
2696 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2698 ("initialization not allowed for limited types", E
);
2699 Explain_Limited_Type
(T
, E
);
2703 Mutate_Ekind
(Id
, K
);
2706 -- Case of generic IN OUT parameter
2709 -- If the formal has an unconstrained type, construct its actual
2710 -- subtype, as is done for subprogram formals. In this fashion, all
2711 -- its uses can refer to specific bounds.
2713 Mutate_Ekind
(Id
, K
);
2716 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2717 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2720 Non_Freezing_Ref
: constant Node_Id
:=
2721 New_Occurrence_Of
(Id
, Sloc
(Id
));
2725 -- Make sure the actual subtype doesn't generate bogus freezing
2727 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2728 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2729 Insert_Before_And_Analyze
(N
, Decl
);
2730 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2733 Set_Actual_Subtype
(Id
, T
);
2738 ("initialization not allowed for `IN OUT` formals", N
);
2742 if Has_Aspects
(N
) then
2743 Analyze_Aspect_Specifications
(N
, Id
);
2745 end Analyze_Formal_Object_Declaration
;
2747 ----------------------------------------------
2748 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2749 ----------------------------------------------
2751 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2755 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2756 Base
: constant Entity_Id
:=
2758 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2759 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2762 -- The semantic attributes are set for completeness only, their values
2763 -- will never be used, since all properties of the type are non-static.
2766 Mutate_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2767 Set_Etype
(T
, Base
);
2768 Set_Size_Info
(T
, Standard_Integer
);
2769 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2770 Set_Small_Value
(T
, Ureal_1
);
2771 Set_Delta_Value
(T
, Ureal_1
);
2772 Set_Scalar_Range
(T
,
2774 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2775 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2776 Set_Is_Constrained
(T
);
2778 Set_Is_Generic_Type
(Base
);
2779 Set_Etype
(Base
, Base
);
2780 Set_Size_Info
(Base
, Standard_Integer
);
2781 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2782 Set_Small_Value
(Base
, Ureal_1
);
2783 Set_Delta_Value
(Base
, Ureal_1
);
2784 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2785 Set_Parent
(Base
, Parent
(Def
));
2787 Check_Restriction
(No_Fixed_Point
, Def
);
2788 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2790 ----------------------------------------
2791 -- Analyze_Formal_Package_Declaration --
2792 ----------------------------------------
2794 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2795 Gen_Id
: constant Node_Id
:= Name
(N
);
2796 Loc
: constant Source_Ptr
:= Sloc
(N
);
2797 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2800 Gen_Unit
: Entity_Id
;
2803 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2804 -- List of primitives made temporarily visible in the instantiation
2805 -- to match the visibility of the formal type.
2807 function Build_Local_Package
return Node_Id
;
2808 -- The formal package is rewritten so that its parameters are replaced
2809 -- with corresponding declarations. For parameters with bona fide
2810 -- associations these declarations are created by Analyze_Associations
2811 -- as for a regular instantiation. For boxed parameters, we preserve
2812 -- the formal declarations and analyze them, in order to introduce
2813 -- entities of the right kind in the environment of the formal.
2815 -------------------------
2816 -- Build_Local_Package --
2817 -------------------------
2819 function Build_Local_Package
return Node_Id
is
2821 Pack_Decl
: Node_Id
;
2824 -- Within the formal, the name of the generic package is a renaming
2825 -- of the formal (as for a regular instantiation).
2828 Make_Package_Declaration
(Loc
,
2831 (Specification
(Original_Node
(Gen_Decl
)),
2832 Empty
, Instantiating
=> True));
2835 Make_Package_Renaming_Declaration
(Loc
,
2836 Defining_Unit_Name
=>
2837 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2838 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2840 if Nkind
(Gen_Id
) = N_Identifier
2841 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2844 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2847 -- If the formal is declared with a box, or with an others choice,
2848 -- create corresponding declarations for all entities in the formal
2849 -- part, so that names with the proper types are available in the
2850 -- specification of the formal package.
2852 -- On the other hand, if there are no associations, then all the
2853 -- formals must have defaults, and this will be checked by the
2854 -- call to Analyze_Associations.
2857 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2860 Formal_Decl
: Node_Id
;
2863 -- TBA : for a formal package, need to recurse ???
2868 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2869 while Present
(Formal_Decl
) loop
2873 (Formal_Decl
, Empty
, Instantiating
=> True));
2878 -- If generic associations are present, use Analyze_Associations to
2879 -- create the proper renaming declarations.
2883 Act_Tree
: constant Node_Id
:=
2885 (Original_Node
(Gen_Decl
), Empty
,
2886 Instantiating
=> True);
2889 Generic_Renamings
.Set_Last
(0);
2890 Generic_Renamings_HTable
.Reset
;
2891 Instantiation_Node
:= N
;
2894 Analyze_Associations
2895 (I_Node
=> Original_Node
(N
),
2896 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2897 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2899 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2903 Append
(Renaming
, To
=> Decls
);
2905 -- Add generated declarations ahead of local declarations in
2908 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2909 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2912 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2917 end Build_Local_Package
;
2921 Save_ISMP
: constant Boolean := Ignore_SPARK_Mode_Pragmas_In_Instance
;
2922 -- Save flag Ignore_SPARK_Mode_Pragmas_In_Instance for restore on exit
2924 Associations
: Boolean := True;
2926 Parent_Installed
: Boolean := False;
2927 Parent_Instance
: Entity_Id
;
2928 Renaming_In_Par
: Entity_Id
;
2930 -- Start of processing for Analyze_Formal_Package_Declaration
2933 Check_Text_IO_Special_Unit
(Gen_Id
);
2936 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2937 Gen_Unit
:= Entity
(Gen_Id
);
2939 -- Check for a formal package that is a package renaming
2941 if Present
(Renamed_Entity
(Gen_Unit
)) then
2943 -- Indicate that unit is used, before replacing it with renamed
2944 -- entity for use below.
2946 if In_Extended_Main_Source_Unit
(N
) then
2947 Set_Is_Instantiated
(Gen_Unit
);
2948 Generate_Reference
(Gen_Unit
, N
);
2951 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
2954 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2955 Error_Msg_N
("expect generic package name", Gen_Id
);
2959 elsif Gen_Unit
= Current_Scope
then
2961 ("generic package cannot be used as a formal package of itself",
2966 elsif In_Open_Scopes
(Gen_Unit
) then
2967 if Is_Compilation_Unit
(Gen_Unit
)
2968 and then Is_Child_Unit
(Current_Scope
)
2970 -- Special-case the error when the formal is a parent, and
2971 -- continue analysis to minimize cascaded errors.
2974 ("generic parent cannot be used as formal package of a child "
2979 ("generic package cannot be used as a formal package within "
2980 & "itself", Gen_Id
);
2986 -- Check that name of formal package does not hide name of generic,
2987 -- or its leading prefix. This check must be done separately because
2988 -- the name of the generic has already been analyzed.
2991 Gen_Name
: Entity_Id
;
2995 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
2996 Gen_Name
:= Prefix
(Gen_Name
);
2999 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
3001 ("& is hidden within declaration of formal package",
3007 or else No
(Generic_Associations
(N
))
3008 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
3010 Associations
:= False;
3013 -- If there are no generic associations, the generic parameters appear
3014 -- as local entities and are instantiated like them. We copy the generic
3015 -- package declaration as if it were an instantiation, and analyze it
3016 -- like a regular package, except that we treat the formals as
3017 -- additional visible components.
3019 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3021 if In_Extended_Main_Source_Unit
(N
) then
3022 Set_Is_Instantiated
(Gen_Unit
);
3023 Generate_Reference
(Gen_Unit
, N
);
3026 Formal
:= New_Copy
(Pack_Id
);
3027 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
3029 -- Make local generic without formals. The formals will be replaced with
3030 -- internal declarations.
3033 New_N
:= Build_Local_Package
;
3035 -- If there are errors in the parameter list, Analyze_Associations
3036 -- raises Instantiation_Error. Patch the declaration to prevent further
3037 -- exception propagation.
3040 when Instantiation_Error
=>
3041 Enter_Name
(Formal
);
3042 Mutate_Ekind
(Formal
, E_Variable
);
3043 Set_Etype
(Formal
, Any_Type
);
3044 Restore_Hidden_Primitives
(Vis_Prims_List
);
3046 if Parent_Installed
then
3054 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
3055 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
3056 Set_Instance_Env
(Gen_Unit
, Formal
);
3057 Set_Is_Generic_Instance
(Formal
);
3059 Enter_Name
(Formal
);
3060 Mutate_Ekind
(Formal
, E_Package
);
3061 Set_Etype
(Formal
, Standard_Void_Type
);
3062 Set_Inner_Instances
(Formal
, New_Elmt_List
);
3064 -- It is unclear that any aspects can apply to a formal package
3065 -- declaration, given that they look like a hidden conformance
3066 -- requirement on the corresponding actual. However, Abstract_State
3067 -- must be treated specially because it generates declarations that
3068 -- must appear before other declarations in the specification and
3069 -- must be analyzed at once.
3071 if Present
(Aspect_Specifications
(Gen_Decl
)) then
3072 if No
(Aspect_Specifications
(N
)) then
3073 Set_Aspect_Specifications
(N
, New_List
);
3074 Set_Has_Aspects
(N
);
3078 ASN
: Node_Id
:= First
(Aspect_Specifications
(Gen_Decl
));
3082 while Present
(ASN
) loop
3083 if Get_Aspect_Id
(ASN
) = Aspect_Abstract_State
then
3085 Copy_Generic_Node
(ASN
, Empty
, Instantiating
=> True);
3086 Set_Entity
(New_A
, Formal
);
3087 Set_Analyzed
(New_A
, False);
3088 Append
(New_A
, Aspect_Specifications
(N
));
3089 Analyze_Aspect_Specifications
(N
, Formal
);
3098 Push_Scope
(Formal
);
3100 -- Manually set the SPARK_Mode from the context because the package
3101 -- declaration is never analyzed.
3103 Set_SPARK_Pragma
(Formal
, SPARK_Mode_Pragma
);
3104 Set_SPARK_Aux_Pragma
(Formal
, SPARK_Mode_Pragma
);
3105 Set_SPARK_Pragma_Inherited
(Formal
);
3106 Set_SPARK_Aux_Pragma_Inherited
(Formal
);
3108 if Is_Child_Unit
(Gen_Unit
) and then Parent_Installed
then
3110 -- Similarly, we have to make the name of the formal visible in the
3111 -- parent instance, to resolve properly fully qualified names that
3112 -- may appear in the generic unit. The parent instance has been
3113 -- placed on the scope stack ahead of the current scope.
3115 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
3118 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
3119 Mutate_Ekind
(Renaming_In_Par
, E_Package
);
3120 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
3121 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
3122 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
3123 Set_Renamed_Entity
(Renaming_In_Par
, Formal
);
3124 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
3127 -- A formal package declaration behaves as a package instantiation with
3128 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
3129 -- missing, set the global flag which signals Analyze_Pragma to ingnore
3130 -- all SPARK_Mode pragmas within the generic_package_name.
3132 if SPARK_Mode
/= On
then
3133 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
3135 -- Mark the formal spec in case the body is instantiated at a later
3136 -- pass. This preserves the original context in effect for the body.
3138 Set_Ignore_SPARK_Mode_Pragmas
(Formal
);
3141 Analyze
(Specification
(N
));
3143 -- The formals for which associations are provided are not visible
3144 -- outside of the formal package. The others are still declared by a
3145 -- formal parameter declaration.
3147 -- If there are no associations, the only local entity to hide is the
3148 -- generated package renaming itself.
3154 E
:= First_Entity
(Formal
);
3155 while Present
(E
) loop
3156 if Associations
and then not Is_Generic_Formal
(E
) then
3160 if Ekind
(E
) = E_Package
and then Renamed_Entity
(E
) = Formal
then
3169 End_Package_Scope
(Formal
);
3170 Restore_Hidden_Primitives
(Vis_Prims_List
);
3172 if Parent_Installed
then
3178 -- Inside the generic unit, the formal package is a regular package, but
3179 -- no body is needed for it. Note that after instantiation, the defining
3180 -- unit name we need is in the new tree and not in the original (see
3181 -- Package_Instantiation). A generic formal package is an instance, and
3182 -- can be used as an actual for an inner instance.
3184 Set_Has_Completion
(Formal
, True);
3186 -- Add semantic information to the original defining identifier.
3188 Mutate_Ekind
(Pack_Id
, E_Package
);
3189 Set_Etype
(Pack_Id
, Standard_Void_Type
);
3190 Set_Scope
(Pack_Id
, Scope
(Formal
));
3191 Set_Has_Completion
(Pack_Id
, True);
3194 if Has_Aspects
(N
) then
3195 -- Unclear that any other aspects may appear here, snalyze them
3196 -- for completion, given that the grammar allows their appearance.
3198 Analyze_Aspect_Specifications
(N
, Pack_Id
);
3201 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Save_ISMP
;
3202 end Analyze_Formal_Package_Declaration
;
3204 ---------------------------------
3205 -- Analyze_Formal_Private_Type --
3206 ---------------------------------
3208 procedure Analyze_Formal_Private_Type
3214 New_Private_Type
(N
, T
, Def
);
3216 -- Set the size to an arbitrary but legal value
3218 Set_Size_Info
(T
, Standard_Integer
);
3219 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3220 end Analyze_Formal_Private_Type
;
3222 ------------------------------------
3223 -- Analyze_Formal_Incomplete_Type --
3224 ------------------------------------
3226 procedure Analyze_Formal_Incomplete_Type
3232 Mutate_Ekind
(T
, E_Incomplete_Type
);
3234 Set_Private_Dependents
(T
, New_Elmt_List
);
3236 if Tagged_Present
(Def
) then
3237 Set_Is_Tagged_Type
(T
);
3238 Make_Class_Wide_Type
(T
);
3239 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
3241 end Analyze_Formal_Incomplete_Type
;
3243 ----------------------------------------
3244 -- Analyze_Formal_Signed_Integer_Type --
3245 ----------------------------------------
3247 procedure Analyze_Formal_Signed_Integer_Type
3251 Base
: constant Entity_Id
:=
3253 (E_Signed_Integer_Type
,
3255 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
3260 Mutate_Ekind
(T
, E_Signed_Integer_Subtype
);
3261 Set_Etype
(T
, Base
);
3262 Set_Size_Info
(T
, Standard_Integer
);
3263 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3264 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
3265 Set_Is_Constrained
(T
);
3267 Set_Is_Generic_Type
(Base
);
3268 Set_Size_Info
(Base
, Standard_Integer
);
3269 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
3270 Set_Etype
(Base
, Base
);
3271 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
3272 Set_Parent
(Base
, Parent
(Def
));
3273 end Analyze_Formal_Signed_Integer_Type
;
3275 -------------------------------------------
3276 -- Analyze_Formal_Subprogram_Declaration --
3277 -------------------------------------------
3279 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
3280 Spec
: constant Node_Id
:= Specification
(N
);
3281 Def
: constant Node_Id
:= Default_Name
(N
);
3282 Expr
: constant Node_Id
:= Expression
(N
);
3283 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
3291 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
3292 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3296 Analyze_Subprogram_Declaration
(N
);
3297 Set_Is_Formal_Subprogram
(Nam
);
3298 Set_Has_Completion
(Nam
);
3300 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3301 Set_Is_Abstract_Subprogram
(Nam
);
3303 Set_Is_Dispatching_Operation
(Nam
);
3305 -- A formal abstract procedure cannot have a null default
3306 -- (RM 12.6(4.1/2)).
3308 if Nkind
(Spec
) = N_Procedure_Specification
3309 and then Null_Present
(Spec
)
3312 ("a formal abstract subprogram cannot default to null", Spec
);
3315 -- A formal abstract function cannot have an expression default
3316 -- (expression defaults are allowed for nonabstract formal functions
3317 -- when extensions are enabled).
3319 if Nkind
(Spec
) = N_Function_Specification
3320 and then Present
(Expr
)
3323 ("a formal abstract subprogram cannot default to an expression",
3328 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3330 if No
(Ctrl_Type
) then
3332 ("abstract formal subprogram must have a controlling type",
3335 elsif Ada_Version
>= Ada_2012
3336 and then Is_Incomplete_Type
(Ctrl_Type
)
3339 ("controlling type of abstract formal subprogram cannot "
3340 & "be incomplete type", N
, Ctrl_Type
);
3343 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3348 -- Default name is resolved at the point of instantiation
3350 if Box_Present
(N
) then
3353 -- Default name is bound at the point of generic declaration
3355 elsif Present
(Def
) then
3356 if Nkind
(Def
) = N_Operator_Symbol
then
3357 Find_Direct_Name
(Def
);
3359 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3363 -- For an attribute reference, analyze the prefix and verify
3364 -- that it has the proper profile for the subprogram.
3366 Analyze
(Prefix
(Def
));
3367 Valid_Default_Attribute
(Nam
, Def
);
3371 -- Default name may be overloaded, in which case the interpretation
3372 -- with the correct profile must be selected, as for a renaming.
3373 -- If the definition is an indexed component, it must denote a
3374 -- member of an entry family. If it is a selected component, it
3375 -- can be a protected operation.
3377 if Etype
(Def
) = Any_Type
then
3380 elsif Nkind
(Def
) = N_Selected_Component
then
3381 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3382 Error_Msg_N
("expect valid subprogram name as default", Def
);
3385 elsif Nkind
(Def
) = N_Indexed_Component
then
3386 if Is_Entity_Name
(Prefix
(Def
)) then
3387 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3388 Error_Msg_N
("expect valid subprogram name as default", Def
);
3391 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3392 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3395 Error_Msg_N
("expect valid subprogram name as default", Def
);
3399 Error_Msg_N
("expect valid subprogram name as default", Def
);
3403 elsif Nkind
(Def
) = N_Character_Literal
then
3405 -- Needs some type checks: subprogram should be parameterless???
3407 Resolve
(Def
, (Etype
(Nam
)));
3409 elsif not Is_Entity_Name
(Def
)
3410 or else not Is_Overloadable
(Entity
(Def
))
3412 Error_Msg_N
("expect valid subprogram name as default", Def
);
3415 elsif not Is_Overloaded
(Def
) then
3416 Subp
:= Entity
(Def
);
3419 Error_Msg_N
("premature usage of formal subprogram", Def
);
3421 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3422 Error_Msg_N
("no visible entity matches specification", Def
);
3425 -- More than one interpretation, so disambiguate as for a renaming
3430 I1
: Interp_Index
:= 0;
3436 Get_First_Interp
(Def
, I
, It
);
3437 while Present
(It
.Nam
) loop
3438 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3439 if Subp
/= Any_Id
then
3440 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3442 if It1
= No_Interp
then
3443 Error_Msg_N
("ambiguous default subprogram", Def
);
3456 Get_Next_Interp
(I
, It
);
3460 if Subp
/= Any_Id
then
3462 -- Subprogram found, generate reference to it
3464 Set_Entity
(Def
, Subp
);
3465 Generate_Reference
(Subp
, Def
);
3468 Error_Msg_N
("premature usage of formal subprogram", Def
);
3470 elsif Ekind
(Subp
) /= E_Operator
then
3471 Check_Mode_Conformant
(Subp
, Nam
);
3475 Error_Msg_N
("no visible subprogram matches specification", N
);
3479 -- When extensions are enabled, an expression can be given as default
3480 -- for a formal function. The expression must be of the function result
3481 -- type and can reference formal parameters of the function.
3483 elsif Present
(Expr
) then
3485 Install_Formals
(Nam
);
3486 Preanalyze_Spec_Expression
(Expr
, Etype
(Nam
));
3491 if Has_Aspects
(N
) then
3492 Analyze_Aspect_Specifications
(N
, Nam
);
3495 end Analyze_Formal_Subprogram_Declaration
;
3497 -------------------------------------
3498 -- Analyze_Formal_Type_Declaration --
3499 -------------------------------------
3501 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3502 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3506 T
:= Defining_Identifier
(N
);
3508 if Present
(Discriminant_Specifications
(N
))
3509 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3512 ("discriminants not allowed for this formal type", T
);
3515 -- Enter the new name, and branch to specific routine
3518 when N_Formal_Private_Type_Definition
=>
3519 Analyze_Formal_Private_Type
(N
, T
, Def
);
3521 when N_Formal_Derived_Type_Definition
=>
3522 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3524 when N_Formal_Incomplete_Type_Definition
=>
3525 Analyze_Formal_Incomplete_Type
(T
, Def
);
3527 when N_Formal_Discrete_Type_Definition
=>
3528 Analyze_Formal_Discrete_Type
(T
, Def
);
3530 when N_Formal_Signed_Integer_Type_Definition
=>
3531 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3533 when N_Formal_Modular_Type_Definition
=>
3534 Analyze_Formal_Modular_Type
(T
, Def
);
3536 when N_Formal_Floating_Point_Definition
=>
3537 Analyze_Formal_Floating_Type
(T
, Def
);
3539 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3540 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3542 when N_Formal_Decimal_Fixed_Point_Definition
=>
3543 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3545 when N_Array_Type_Definition
=>
3546 Analyze_Formal_Array_Type
(T
, Def
);
3548 when N_Access_Function_Definition
3549 | N_Access_Procedure_Definition
3550 | N_Access_To_Object_Definition
3552 Analyze_Generic_Access_Type
(T
, Def
);
3554 -- Ada 2005: a interface declaration is encoded as an abstract
3555 -- record declaration or a abstract type derivation.
3557 when N_Record_Definition
=>
3558 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3560 when N_Derived_Type_Definition
=>
3561 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3567 raise Program_Error
;
3570 -- A formal type declaration declares a type and its first
3573 Set_Is_Generic_Type
(T
);
3574 Set_Is_First_Subtype
(T
);
3576 if Present
(Default_Subtype_Mark
(Original_Node
(N
))) then
3577 Validate_Formal_Type_Default
(N
);
3580 if Has_Aspects
(N
) then
3581 Analyze_Aspect_Specifications
(N
, T
);
3583 end Analyze_Formal_Type_Declaration
;
3585 ------------------------------------
3586 -- Analyze_Function_Instantiation --
3587 ------------------------------------
3589 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3591 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3592 end Analyze_Function_Instantiation
;
3594 ---------------------------------
3595 -- Analyze_Generic_Access_Type --
3596 ---------------------------------
3598 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3602 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3603 Access_Type_Declaration
(T
, Def
);
3605 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3606 and then No
(Full_View
(Designated_Type
(T
)))
3607 and then not Is_Generic_Type
(Designated_Type
(T
))
3609 Error_Msg_N
("premature usage of incomplete type", Def
);
3611 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3613 ("only a subtype mark is allowed in a formal", Def
);
3617 Access_Subprogram_Declaration
(T
, Def
);
3619 end Analyze_Generic_Access_Type
;
3621 ---------------------------------
3622 -- Analyze_Generic_Formal_Part --
3623 ---------------------------------
3625 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3626 Gen_Parm_Decl
: Node_Id
;
3629 -- The generic formals are processed in the scope of the generic unit,
3630 -- where they are immediately visible. The scope is installed by the
3633 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3634 while Present
(Gen_Parm_Decl
) loop
3635 Analyze
(Gen_Parm_Decl
);
3636 Next
(Gen_Parm_Decl
);
3639 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3641 -- For Ada 2022, some formal parameters can carry aspects, which must
3642 -- be name-resolved at the end of the list of formal parameters (which
3643 -- has the semantics of a declaration list).
3645 Analyze_Contracts
(Generic_Formal_Declarations
(N
));
3646 end Analyze_Generic_Formal_Part
;
3648 ------------------------------------------
3649 -- Analyze_Generic_Package_Declaration --
3650 ------------------------------------------
3652 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3653 Decls
: constant List_Id
:= Visible_Declarations
(Specification
(N
));
3654 Loc
: constant Source_Ptr
:= Sloc
(N
);
3660 Save_Parent
: Node_Id
;
3663 -- A generic may grant access to its private enclosing context depending
3664 -- on the placement of its corresponding body. From elaboration point of
3665 -- view, the flow of execution may enter this private context, and then
3666 -- reach an external unit, thus producing a dependency on that external
3667 -- unit. For such a path to be properly discovered and encoded in the
3668 -- ALI file of the main unit, let the ABE mechanism process the body of
3669 -- the main unit, and encode all relevant invocation constructs and the
3670 -- relations between them.
3672 Mark_Save_Invocation_Graph_Of_Body
;
3674 -- We introduce a renaming of the enclosing package, to have a usable
3675 -- entity as the prefix of an expanded name for a local entity of the
3676 -- form Par.P.Q, where P is the generic package. This is because a local
3677 -- entity named P may hide it, so that the usual visibility rules in
3678 -- the instance will not resolve properly.
3681 Make_Package_Renaming_Declaration
(Loc
,
3682 Defining_Unit_Name
=>
3683 Make_Defining_Identifier
(Loc
,
3684 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3686 Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3688 -- The declaration is inserted before other declarations, but before
3689 -- pragmas that may be library-unit pragmas and must appear before other
3690 -- declarations. The pragma Compile_Time_Error is not in this class, and
3691 -- may contain an expression that includes such a qualified name, so the
3692 -- renaming declaration must appear before it.
3694 -- Are there other pragmas that require this special handling ???
3696 if Present
(Decls
) then
3697 Decl
:= First
(Decls
);
3698 while Present
(Decl
)
3699 and then Nkind
(Decl
) = N_Pragma
3700 and then Get_Pragma_Id
(Decl
) /= Pragma_Compile_Time_Error
3705 if Present
(Decl
) then
3706 Insert_Before
(Decl
, Renaming
);
3708 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3712 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3715 -- Create copy of generic unit, and save for instantiation. If the unit
3716 -- is a child unit, do not copy the specifications for the parent, which
3717 -- are not part of the generic tree.
3719 Save_Parent
:= Parent_Spec
(N
);
3720 Set_Parent_Spec
(N
, Empty
);
3722 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3723 Set_Parent_Spec
(New_N
, Save_Parent
);
3726 -- Once the contents of the generic copy and the template are swapped,
3727 -- do the same for their respective aspect specifications.
3729 Exchange_Aspects
(N
, New_N
);
3731 -- Collect all contract-related source pragmas found within the template
3732 -- and attach them to the contract of the package spec. This contract is
3733 -- used in the capture of global references within annotations.
3735 Create_Generic_Contract
(N
);
3737 Id
:= Defining_Entity
(N
);
3738 Generate_Definition
(Id
);
3740 -- Expansion is not applied to generic units
3745 Mutate_Ekind
(Id
, E_Generic_Package
);
3746 Set_Etype
(Id
, Standard_Void_Type
);
3748 -- Set SPARK_Mode from context
3750 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3751 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
3752 Set_SPARK_Pragma_Inherited
(Id
);
3753 Set_SPARK_Aux_Pragma_Inherited
(Id
);
3755 -- Preserve relevant elaboration-related attributes of the context which
3756 -- are no longer available or very expensive to recompute once analysis,
3757 -- resolution, and expansion are over.
3759 Mark_Elaboration_Attributes
3764 -- Analyze aspects now, so that generated pragmas appear in the
3765 -- declarations before building and analyzing the generic copy.
3767 if Has_Aspects
(N
) then
3768 Analyze_Aspect_Specifications
(N
, Id
);
3772 Enter_Generic_Scope
(Id
);
3773 Set_Inner_Instances
(Id
, New_Elmt_List
);
3775 Set_Categorization_From_Pragmas
(N
);
3776 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3778 -- Link the declaration of the generic homonym in the generic copy to
3779 -- the package it renames, so that it is always resolved properly.
3781 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3782 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3784 -- For a library unit, we have reconstructed the entity for the unit,
3785 -- and must reset it in the library tables.
3787 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3788 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3791 Analyze_Generic_Formal_Part
(N
);
3793 -- After processing the generic formals, analysis proceeds as for a
3794 -- non-generic package.
3796 Analyze
(Specification
(N
));
3798 Validate_Categorization_Dependency
(N
, Id
);
3802 End_Package_Scope
(Id
);
3803 Exit_Generic_Scope
(Id
);
3805 -- If the generic appears within a package unit, the body of that unit
3806 -- has to be present for instantiation and inlining.
3808 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
then
3809 Set_Body_Needed_For_Inlining
3810 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3813 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3814 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3815 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3816 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3819 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3820 Validate_RT_RAT_Component
(N
);
3822 -- If this is a spec without a body, check that generic parameters
3825 if not Body_Required
(Parent
(N
)) then
3826 Check_References
(Id
);
3830 -- If there is a specified storage pool in the context, create an
3831 -- aspect on the package declaration, so that it is used in any
3832 -- instance that does not override it.
3834 if Present
(Default_Pool
) then
3840 Make_Aspect_Specification
(Loc
,
3841 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3842 Expression
=> New_Copy
(Default_Pool
));
3844 if No
(Aspect_Specifications
(Specification
(N
))) then
3845 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3847 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3851 end Analyze_Generic_Package_Declaration
;
3853 --------------------------------------------
3854 -- Analyze_Generic_Subprogram_Declaration --
3855 --------------------------------------------
3857 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3861 Result_Type
: Entity_Id
;
3862 Save_Parent
: Node_Id
;
3867 -- A generic may grant access to its private enclosing context depending
3868 -- on the placement of its corresponding body. From elaboration point of
3869 -- view, the flow of execution may enter this private context, and then
3870 -- reach an external unit, thus producing a dependency on that external
3871 -- unit. For such a path to be properly discovered and encoded in the
3872 -- ALI file of the main unit, let the ABE mechanism process the body of
3873 -- the main unit, and encode all relevant invocation constructs and the
3874 -- relations between them.
3876 Mark_Save_Invocation_Graph_Of_Body
;
3878 -- Create copy of generic unit, and save for instantiation. If the unit
3879 -- is a child unit, do not copy the specifications for the parent, which
3880 -- are not part of the generic tree.
3882 Save_Parent
:= Parent_Spec
(N
);
3883 Set_Parent_Spec
(N
, Empty
);
3885 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3886 Set_Parent_Spec
(New_N
, Save_Parent
);
3889 -- Once the contents of the generic copy and the template are swapped,
3890 -- do the same for their respective aspect specifications.
3892 Exchange_Aspects
(N
, New_N
);
3894 -- Collect all contract-related source pragmas found within the template
3895 -- and attach them to the contract of the subprogram spec. This contract
3896 -- is used in the capture of global references within annotations.
3898 Create_Generic_Contract
(N
);
3900 Spec
:= Specification
(N
);
3901 Id
:= Defining_Entity
(Spec
);
3902 Generate_Definition
(Id
);
3904 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3906 ("operator symbol not allowed for generic subprogram", Id
);
3912 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3915 Enter_Generic_Scope
(Id
);
3916 Set_Inner_Instances
(Id
, New_Elmt_List
);
3917 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3919 Analyze_Generic_Formal_Part
(N
);
3921 if Nkind
(Spec
) = N_Function_Specification
then
3922 Mutate_Ekind
(Id
, E_Generic_Function
);
3924 Mutate_Ekind
(Id
, E_Generic_Procedure
);
3927 -- Set SPARK_Mode from context
3929 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3930 Set_SPARK_Pragma_Inherited
(Id
);
3932 -- Preserve relevant elaboration-related attributes of the context which
3933 -- are no longer available or very expensive to recompute once analysis,
3934 -- resolution, and expansion are over.
3936 Mark_Elaboration_Attributes
3941 Formals
:= Parameter_Specifications
(Spec
);
3943 if Present
(Formals
) then
3944 Process_Formals
(Formals
, Spec
);
3947 if Nkind
(Spec
) = N_Function_Specification
then
3948 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3949 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3950 Set_Etype
(Id
, Result_Type
);
3952 -- Check restriction imposed by AI05-073: a generic function
3953 -- cannot return an abstract type or an access to such.
3955 if Is_Abstract_Type
(Designated_Type
(Result_Type
)) then
3957 ("generic function cannot have an access result "
3958 & "that designates an abstract type", Spec
);
3962 Find_Type
(Result_Definition
(Spec
));
3963 Typ
:= Entity
(Result_Definition
(Spec
));
3965 if Is_Abstract_Type
(Typ
)
3966 and then Ada_Version
>= Ada_2012
3969 ("generic function cannot have abstract result type", Spec
);
3972 -- If a null exclusion is imposed on the result type, then create
3973 -- a null-excluding itype (an access subtype) and use it as the
3974 -- function's Etype.
3976 if Is_Access_Type
(Typ
)
3977 and then Null_Exclusion_Present
(Spec
)
3980 Create_Null_Excluding_Itype
3982 Related_Nod
=> Spec
,
3983 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3985 Set_Etype
(Id
, Typ
);
3990 Set_Etype
(Id
, Standard_Void_Type
);
3993 -- Analyze the aspects of the generic copy to ensure that all generated
3994 -- pragmas (if any) perform their semantic effects.
3996 if Has_Aspects
(N
) then
3997 Analyze_Aspect_Specifications
(N
, Id
);
4000 -- For a library unit, we have reconstructed the entity for the unit,
4001 -- and must reset it in the library tables. We also make sure that
4002 -- Body_Required is set properly in the original compilation unit node.
4004 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4005 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
4006 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
4009 -- If the generic appears within a package unit, the body of that unit
4010 -- has to be present for instantiation and inlining.
4012 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
4013 and then Unit_Requires_Body
(Id
)
4015 Set_Body_Needed_For_Inlining
4016 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
4019 Set_Categorization_From_Pragmas
(N
);
4020 Validate_Categorization_Dependency
(N
, Id
);
4022 -- Capture all global references that occur within the profile of the
4023 -- generic subprogram. Aspects are not part of this processing because
4024 -- they must be delayed. If processed now, Save_Global_References will
4025 -- destroy the Associated_Node links and prevent the capture of global
4026 -- references when the contract of the generic subprogram is analyzed.
4028 Save_Global_References
(Original_Node
(N
));
4032 Exit_Generic_Scope
(Id
);
4033 Generate_Reference_To_Formals
(Id
);
4035 List_Inherited_Pre_Post_Aspects
(Id
);
4036 end Analyze_Generic_Subprogram_Declaration
;
4038 -----------------------------------
4039 -- Analyze_Package_Instantiation --
4040 -----------------------------------
4042 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
4043 -- must be replaced by gotos which jump to the end of the routine in order
4044 -- to restore the Ghost and SPARK modes.
4046 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
4047 Has_Inline_Always
: Boolean := False;
4048 -- Set if the generic unit contains any subprograms with Inline_Always.
4049 -- Only relevant when back-end inlining is not enabled.
4051 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean;
4052 -- Return True if inlining is active and Gen_Unit contains inlined
4053 -- subprograms. In this case, we may either instantiate the body when
4054 -- front-end inlining is enabled, or add a pending instantiation when
4055 -- back-end inlining is enabled. In the former case, this may cause
4056 -- superfluous instantiations, but in either case we need to perform
4057 -- the instantiation of the body in the context of the instance and
4058 -- not in that of the point of inlining.
4060 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean;
4061 -- Return True if Gen_Unit needs to have its body instantiated in the
4062 -- context of N. This in particular excludes generic contexts.
4064 -----------------------
4065 -- Might_Inline_Subp --
4066 -----------------------
4068 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean is
4072 if Inline_Processing_Required
then
4073 -- No need to recompute the answer if we know it is positive
4074 -- and back-end inlining is enabled.
4076 if Is_Inlined
(Gen_Unit
) and then Back_End_Inlining
then
4080 E
:= First_Entity
(Gen_Unit
);
4081 while Present
(E
) loop
4082 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
4083 -- Remember if there are any subprograms with Inline_Always
4085 if Has_Pragma_Inline_Always
(E
) then
4086 Has_Inline_Always
:= True;
4089 Set_Is_Inlined
(Gen_Unit
);
4098 end Might_Inline_Subp
;
4100 -------------------------------
4101 -- Needs_Body_Instantiated --
4102 -------------------------------
4104 function Needs_Body_Instantiated
(Gen_Unit
: Entity_Id
) return Boolean is
4106 -- No need to instantiate bodies in generic units
4108 if Is_Generic_Unit
(Cunit_Entity
(Main_Unit
)) then
4112 -- If the instantiation is in the main unit, then the body is needed
4114 if Is_In_Main_Unit
(N
) then
4118 -- In GNATprove mode, never instantiate bodies outside of the main
4119 -- unit, as it does not use frontend/backend inlining in the way that
4120 -- GNAT does, so does not benefit from such instantiations. On the
4121 -- contrary, such instantiations may bring artificial constraints,
4122 -- as for example such bodies may require preprocessing.
4124 if GNATprove_Mode
then
4128 -- If not, then again no need to instantiate bodies in generic units
4130 if Is_Generic_Unit
(Cunit_Entity
(Get_Code_Unit
(N
))) then
4134 -- Here we have a special handling for back-end inlining: if inline
4135 -- processing is required, then we unconditionally want to have the
4136 -- body instantiated. The reason is that Might_Inline_Subp does not
4137 -- catch all the cases (as it does not recurse into nested packages)
4138 -- so this avoids the need to patch things up afterwards. Moreover,
4139 -- these instantiations are only performed on demand when back-end
4140 -- inlining is enabled, so this causes very little extra work.
4142 if Inline_Processing_Required
and then Back_End_Inlining
then
4146 -- We want to have the bodies instantiated in non-main units if
4147 -- they might contribute inlined subprograms.
4149 return Might_Inline_Subp
(Gen_Unit
);
4150 end Needs_Body_Instantiated
;
4152 -- Local declarations
4154 Gen_Id
: constant Node_Id
:= Name
(N
);
4155 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
4156 Is_Actual_Pack
: constant Boolean := Is_Internal
(Inst_Id
);
4157 Loc
: constant Source_Ptr
:= Sloc
(N
);
4159 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4160 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
4161 Saved_ISMP
: constant Boolean :=
4162 Ignore_SPARK_Mode_Pragmas_In_Instance
;
4163 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4164 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4165 -- Save the Ghost and SPARK mode-related data to restore on exit
4167 Saved_Style_Check
: constant Boolean := Style_Check
;
4168 -- Save style check mode for restore on exit
4171 Act_Decl_Name
: Node_Id
;
4172 Act_Decl_Id
: Entity_Id
;
4175 Env_Installed
: Boolean := False;
4178 Gen_Unit
: Entity_Id
;
4179 Inline_Now
: Boolean := False;
4180 Needs_Body
: Boolean;
4181 Parent_Installed
: Boolean := False;
4182 Renaming_List
: List_Id
;
4183 Unit_Renaming
: Node_Id
;
4185 Vis_Prims_List
: Elist_Id
:= No_Elist
;
4186 -- List of primitives made temporarily visible in the instantiation
4187 -- to match the visibility of the formal type
4189 -- Start of processing for Analyze_Package_Instantiation
4192 -- Preserve relevant elaboration-related attributes of the context which
4193 -- are no longer available or very expensive to recompute once analysis,
4194 -- resolution, and expansion are over.
4196 Mark_Elaboration_Attributes
4203 -- Very first thing: check for Text_IO special unit in case we are
4204 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
4206 Check_Text_IO_Special_Unit
(Name
(N
));
4208 -- Make node global for error reporting
4210 Instantiation_Node
:= N
;
4212 -- Case of instantiation of a generic package
4214 if Nkind
(N
) = N_Package_Instantiation
then
4215 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4216 Set_Comes_From_Source
(Act_Decl_Id
, True);
4218 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
4220 Make_Defining_Program_Unit_Name
(Loc
,
4222 New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
4223 Defining_Identifier
=> Act_Decl_Id
);
4225 Act_Decl_Name
:= Act_Decl_Id
;
4228 -- Case of instantiation of a formal package
4231 Act_Decl_Id
:= Defining_Identifier
(N
);
4232 Act_Decl_Name
:= Act_Decl_Id
;
4235 Generate_Definition
(Act_Decl_Id
);
4236 Mutate_Ekind
(Act_Decl_Id
, E_Package
);
4238 -- Initialize list of incomplete actuals before analysis
4240 Set_Incomplete_Actuals
(Act_Decl_Id
, New_Elmt_List
);
4242 Preanalyze_Actuals
(N
, Act_Decl_Id
);
4244 -- Turn off style checking in instances. If the check is enabled on the
4245 -- generic unit, a warning in an instance would just be noise. If not
4246 -- enabled on the generic, then a warning in an instance is just wrong.
4247 -- This must be done after analyzing the actuals, which do come from
4248 -- source and are subject to style checking.
4250 Style_Check
:= False;
4253 Env_Installed
:= True;
4255 -- Reset renaming map for formal types. The mapping is established
4256 -- when analyzing the generic associations, but some mappings are
4257 -- inherited from formal packages of parent units, and these are
4258 -- constructed when the parents are installed.
4260 Generic_Renamings
.Set_Last
(0);
4261 Generic_Renamings_HTable
.Reset
;
4263 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4264 Gen_Unit
:= Entity
(Gen_Id
);
4266 -- A package instantiation is Ghost when it is subject to pragma Ghost
4267 -- or the generic template is Ghost. Set the mode now to ensure that
4268 -- any nodes generated during analysis and expansion are marked as
4271 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
4273 -- Verify that it is the name of a generic package
4275 -- A visibility glitch: if the instance is a child unit and the generic
4276 -- is the generic unit of a parent instance (i.e. both the parent and
4277 -- the child units are instances of the same package) the name now
4278 -- denotes the renaming within the parent, not the intended generic
4279 -- unit. See if there is a homonym that is the desired generic. The
4280 -- renaming declaration must be visible inside the instance of the
4281 -- child, but not when analyzing the name in the instantiation itself.
4283 if Ekind
(Gen_Unit
) = E_Package
4284 and then Present
(Renamed_Entity
(Gen_Unit
))
4285 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
4286 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
4287 and then Present
(Homonym
(Gen_Unit
))
4289 Gen_Unit
:= Homonym
(Gen_Unit
);
4292 if Etype
(Gen_Unit
) = Any_Type
then
4296 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
4298 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
4300 if From_Limited_With
(Gen_Unit
) then
4302 ("cannot instantiate a limited withed package", Gen_Id
);
4305 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
4312 if In_Extended_Main_Source_Unit
(N
) then
4313 Set_Is_Instantiated
(Gen_Unit
);
4314 Generate_Reference
(Gen_Unit
, N
);
4316 if Present
(Renamed_Entity
(Gen_Unit
)) then
4317 Set_Is_Instantiated
(Renamed_Entity
(Gen_Unit
));
4318 Generate_Reference
(Renamed_Entity
(Gen_Unit
), N
);
4322 if Nkind
(Gen_Id
) = N_Identifier
4323 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4326 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4328 elsif Nkind
(Gen_Id
) = N_Expanded_Name
4329 and then Is_Child_Unit
(Gen_Unit
)
4330 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
4331 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
4334 ("& is hidden within declaration of instance", Prefix
(Gen_Id
));
4337 Set_Entity
(Gen_Id
, Gen_Unit
);
4339 -- If generic is a renaming, get original generic unit
4341 if Present
(Renamed_Entity
(Gen_Unit
))
4342 and then Ekind
(Renamed_Entity
(Gen_Unit
)) = E_Generic_Package
4344 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
4347 -- Verify that there are no circular instantiations
4349 if In_Open_Scopes
(Gen_Unit
) then
4350 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4354 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4355 Error_Msg_Node_2
:= Current_Scope
;
4357 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
4358 Circularity_Detected
:= True;
4363 Mutate_Ekind
(Inst_Id
, E_Package
);
4364 Set_Scope
(Inst_Id
, Current_Scope
);
4366 -- If the context of the instance is subject to SPARK_Mode "off" or
4367 -- the annotation is altogether missing, set the global flag which
4368 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
4371 if SPARK_Mode
/= On
then
4372 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4374 -- Mark the instance spec in case the body is instantiated at a
4375 -- later pass. This preserves the original context in effect for
4378 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
4381 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4382 Gen_Spec
:= Specification
(Gen_Decl
);
4384 -- Initialize renamings map, for error checking, and the list that
4385 -- holds private entities whose views have changed between generic
4386 -- definition and instantiation. If this is the instance created to
4387 -- validate an actual package, the instantiation environment is that
4388 -- of the enclosing instance.
4390 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
4392 -- Copy original generic tree, to produce text for instantiation
4396 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4398 Act_Spec
:= Specification
(Act_Tree
);
4400 -- If this is the instance created to validate an actual package,
4401 -- only the formals matter, do not examine the package spec itself.
4403 if Is_Actual_Pack
then
4404 Set_Visible_Declarations
(Act_Spec
, New_List
);
4405 Set_Private_Declarations
(Act_Spec
, New_List
);
4409 Analyze_Associations
4411 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4412 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4414 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4416 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
4417 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
4418 Set_Is_Generic_Instance
(Act_Decl_Id
);
4419 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4421 -- References to the generic in its own declaration or its body are
4422 -- references to the instance. Add a renaming declaration for the
4423 -- generic unit itself. This declaration, as well as the renaming
4424 -- declarations for the generic formals, must remain private to the
4425 -- unit: the formals, because this is the language semantics, and
4426 -- the unit because its use is an artifact of the implementation.
4429 Make_Package_Renaming_Declaration
(Loc
,
4430 Defining_Unit_Name
=>
4431 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
4432 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
4434 Append
(Unit_Renaming
, Renaming_List
);
4436 -- The renaming declarations are the first local declarations of the
4439 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
4441 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
4443 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
4446 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
4448 -- Propagate the aspect specifications from the package declaration
4449 -- template to the instantiated version of the package declaration.
4451 if Has_Aspects
(Act_Tree
) then
4452 Set_Aspect_Specifications
(Act_Decl
,
4453 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
4456 -- The generic may have a generated Default_Storage_Pool aspect,
4457 -- set at the point of generic declaration. If the instance has
4458 -- that aspect, it overrides the one inherited from the generic.
4460 if Has_Aspects
(Gen_Spec
) then
4461 if No
(Aspect_Specifications
(N
)) then
4462 Set_Aspect_Specifications
(N
,
4464 (Aspect_Specifications
(Gen_Spec
))));
4468 Inherited_Aspects
: constant List_Id
:=
4470 (Aspect_Specifications
(Gen_Spec
));
4474 Pool_Present
: Boolean := False;
4477 ASN1
:= First
(Aspect_Specifications
(N
));
4478 while Present
(ASN1
) loop
4479 if Chars
(Identifier
(ASN1
)) =
4480 Name_Default_Storage_Pool
4482 Pool_Present
:= True;
4489 if Pool_Present
then
4491 -- If generic carries a default storage pool, remove it
4492 -- in favor of the instance one.
4494 ASN2
:= First
(Inherited_Aspects
);
4495 while Present
(ASN2
) loop
4496 if Chars
(Identifier
(ASN2
)) =
4497 Name_Default_Storage_Pool
4508 (Aspect_Specifications
(N
), Inherited_Aspects
);
4513 -- Save the instantiation node for a subsequent instantiation of the
4514 -- body if there is one and it needs to be instantiated here.
4516 -- We instantiate the body only if we are generating code, or if we
4517 -- are generating cross-reference information, or for GNATprove use.
4520 Enclosing_Body_Present
: Boolean := False;
4521 -- If the generic unit is not a compilation unit, then a body may
4522 -- be present in its parent even if none is required. We create a
4523 -- tentative pending instantiation for the body, which will be
4524 -- discarded if none is actually present.
4529 if Scope
(Gen_Unit
) /= Standard_Standard
4530 and then not Is_Child_Unit
(Gen_Unit
)
4532 Scop
:= Scope
(Gen_Unit
);
4533 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
4534 if Unit_Requires_Body
(Scop
) then
4535 Enclosing_Body_Present
:= True;
4538 elsif In_Open_Scopes
(Scop
)
4539 and then In_Package_Body
(Scop
)
4541 Enclosing_Body_Present
:= True;
4545 exit when Is_Compilation_Unit
(Scop
);
4546 Scop
:= Scope
(Scop
);
4550 -- If front-end inlining is enabled or there are any subprograms
4551 -- marked with Inline_Always, and this is a unit for which code
4552 -- will be generated, we instantiate the body at once.
4554 -- This is done if the instance is not the main unit, and if the
4555 -- generic is not a child unit of another generic, to avoid scope
4556 -- problems and the reinstallation of parent instances.
4559 and then (not Is_Child_Unit
(Gen_Unit
)
4560 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4561 and then Might_Inline_Subp
(Gen_Unit
)
4562 and then not Is_Actual_Pack
4564 if not Back_End_Inlining
4565 and then (Front_End_Inlining
or else Has_Inline_Always
)
4566 and then (Is_In_Main_Unit
(N
)
4567 or else In_Main_Context
(Current_Scope
))
4568 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4572 -- In configurable_run_time mode we force the inlining of
4573 -- predefined subprograms marked Inline_Always, to minimize
4574 -- the use of the run-time library.
4576 elsif In_Predefined_Unit
(Gen_Decl
)
4577 and then Configurable_Run_Time_Mode
4578 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4583 -- If the current scope is itself an instance within a child
4584 -- unit, there will be duplications in the scope stack, and the
4585 -- unstacking mechanism in Inline_Instance_Body will fail.
4586 -- This loses some rare cases of optimization.
4588 if Is_Generic_Instance
(Current_Scope
) then
4590 Curr_Unit
: constant Entity_Id
:=
4591 Cunit_Entity
(Current_Sem_Unit
);
4593 if Curr_Unit
/= Current_Scope
4594 and then Is_Child_Unit
(Curr_Unit
)
4596 Inline_Now
:= False;
4603 (Unit_Requires_Body
(Gen_Unit
)
4604 or else Enclosing_Body_Present
4605 or else Present
(Corresponding_Body
(Gen_Decl
)))
4606 and then Needs_Body_Instantiated
(Gen_Unit
)
4607 and then not Is_Actual_Pack
4608 and then not Inline_Now
4609 and then (Operating_Mode
= Generate_Code
4610 or else (Operating_Mode
= Check_Semantics
4611 and then GNATprove_Mode
));
4613 -- If front-end inlining is enabled or there are any subprograms
4614 -- marked with Inline_Always, do not instantiate body when within
4615 -- a generic context.
4617 if not Back_End_Inlining
4618 and then (Front_End_Inlining
or else Has_Inline_Always
)
4619 and then not Expander_Active
4621 Needs_Body
:= False;
4624 -- If the current context is generic, and the package being
4625 -- instantiated is declared within a formal package, there is no
4626 -- body to instantiate until the enclosing generic is instantiated
4627 -- and there is an actual for the formal package. If the formal
4628 -- package has parameters, we build a regular package instance for
4629 -- it, that precedes the original formal package declaration.
4631 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4633 Decl
: constant Node_Id
:=
4635 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4637 if Nkind
(Decl
) = N_Formal_Package_Declaration
4638 or else (Nkind
(Decl
) = N_Package_Declaration
4639 and then Is_List_Member
(Decl
)
4640 and then Present
(Next
(Decl
))
4642 Nkind
(Next
(Decl
)) =
4643 N_Formal_Package_Declaration
)
4645 Needs_Body
:= False;
4651 -- For RCI unit calling stubs, we omit the instance body if the
4652 -- instance is the RCI library unit itself.
4654 -- However there is a special case for nested instances: in this case
4655 -- we do generate the instance body, as it might be required, e.g.
4656 -- because it provides stream attributes for some type used in the
4657 -- profile of a remote subprogram. This is consistent with 12.3(12),
4658 -- which indicates that the instance body occurs at the place of the
4659 -- instantiation, and thus is part of the RCI declaration, which is
4660 -- present on all client partitions (this is E.2.3(18)).
4662 -- Note that AI12-0002 may make it illegal at some point to have
4663 -- stream attributes defined in an RCI unit, in which case this
4664 -- special case will become unnecessary. In the meantime, there
4665 -- is known application code in production that depends on this
4666 -- being possible, so we definitely cannot eliminate the body in
4667 -- the case of nested instances for the time being.
4669 -- When we generate a nested instance body, calling stubs for any
4670 -- relevant subprogram will be inserted immediately after the
4671 -- subprogram declarations, and will take precedence over the
4672 -- subsequent (original) body. (The stub and original body will be
4673 -- complete homographs, but this is permitted in an instance).
4674 -- (Could we do better and remove the original body???)
4676 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4677 and then Comes_From_Source
(N
)
4678 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4680 Needs_Body
:= False;
4684 -- Indicate that the enclosing scopes contain an instantiation,
4685 -- and that cleanup actions should be delayed until after the
4686 -- instance body is expanded.
4688 Check_Forward_Instantiation
(Gen_Decl
);
4689 if Nkind
(N
) = N_Package_Instantiation
then
4691 Enclosing_Master
: Entity_Id
;
4694 -- Loop to search enclosing masters
4696 Enclosing_Master
:= Current_Scope
;
4697 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
4698 if Ekind
(Enclosing_Master
) = E_Package
then
4699 if Is_Compilation_Unit
(Enclosing_Master
) then
4700 if In_Package_Body
(Enclosing_Master
) then
4701 Set_Delay_Subprogram_Descriptors
4702 (Body_Entity
(Enclosing_Master
));
4704 Set_Delay_Subprogram_Descriptors
4711 Enclosing_Master
:= Scope
(Enclosing_Master
);
4714 elsif Is_Generic_Unit
(Enclosing_Master
)
4715 or else Ekind
(Enclosing_Master
) = E_Void
4717 -- Cleanup actions will eventually be performed on the
4718 -- enclosing subprogram or package instance, if any.
4719 -- Enclosing scope is void in the formal part of a
4720 -- generic subprogram.
4725 if Ekind
(Enclosing_Master
) = E_Entry
4727 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
4729 if not Expander_Active
then
4733 Protected_Body_Subprogram
(Enclosing_Master
);
4737 Set_Delay_Cleanups
(Enclosing_Master
);
4739 while Ekind
(Enclosing_Master
) = E_Block
loop
4740 Enclosing_Master
:= Scope
(Enclosing_Master
);
4743 if Is_Subprogram
(Enclosing_Master
) then
4744 Set_Delay_Subprogram_Descriptors
(Enclosing_Master
);
4746 elsif Is_Task_Type
(Enclosing_Master
) then
4748 TBP
: constant Node_Id
:=
4749 Get_Task_Body_Procedure
4752 if Present
(TBP
) then
4753 Set_Delay_Subprogram_Descriptors
(TBP
);
4754 Set_Delay_Cleanups
(TBP
);
4761 end loop Scope_Loop
;
4764 -- Make entry in table
4766 Add_Pending_Instantiation
(N
, Act_Decl
);
4770 Set_Categorization_From_Pragmas
(Act_Decl
);
4772 if Parent_Installed
then
4776 Set_Instance_Spec
(N
, Act_Decl
);
4778 -- If not a compilation unit, insert the package declaration before
4779 -- the original instantiation node.
4781 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4782 Mark_Rewrite_Insertion
(Act_Decl
);
4783 Insert_Before
(N
, Act_Decl
);
4785 if Has_Aspects
(N
) then
4786 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4788 -- The pragma created for a Default_Storage_Pool aspect must
4789 -- appear ahead of the declarations in the instance spec.
4790 -- Analysis has placed it after the instance node, so remove
4791 -- it and reinsert it properly now.
4794 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4795 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4799 if A_Name
= Name_Default_Storage_Pool
then
4800 if No
(Visible_Declarations
(Act_Spec
)) then
4801 Set_Visible_Declarations
(Act_Spec
, New_List
);
4805 while Present
(Decl
) loop
4806 if Nkind
(Decl
) = N_Pragma
then
4808 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4820 -- For an instantiation that is a compilation unit, place
4821 -- declaration on current node so context is complete for analysis
4822 -- (including nested instantiations). If this is the main unit,
4823 -- the declaration eventually replaces the instantiation node.
4824 -- If the instance body is created later, it replaces the
4825 -- instance node, and the declaration is attached to it
4826 -- (see Build_Instance_Compilation_Unit_Nodes).
4829 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4831 -- The entity for the current unit is the newly created one,
4832 -- and all semantic information is attached to it.
4834 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4836 -- If this is the main unit, replace the main entity as well
4838 if Current_Sem_Unit
= Main_Unit
then
4839 Main_Unit_Entity
:= Act_Decl_Id
;
4843 Set_Unit
(Parent
(N
), Act_Decl
);
4844 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4845 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4847 -- Process aspect specifications of the instance node, if any, to
4848 -- take into account categorization pragmas before analyzing the
4851 if Has_Aspects
(N
) then
4852 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4856 Set_Unit
(Parent
(N
), N
);
4857 Set_Body_Required
(Parent
(N
), False);
4859 -- We never need elaboration checks on instantiations, since by
4860 -- definition, the body instantiation is elaborated at the same
4861 -- time as the spec instantiation.
4863 if Legacy_Elaboration_Checks
then
4864 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4865 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4869 if Legacy_Elaboration_Checks
then
4870 Check_Elab_Instantiation
(N
);
4873 -- Save the scenario for later examination by the ABE Processing
4876 Record_Elaboration_Scenario
(N
);
4878 -- The instantiation results in a guaranteed ABE
4880 if Is_Known_Guaranteed_ABE
(N
) and then Needs_Body
then
4881 -- Do not instantiate the corresponding body because gigi cannot
4882 -- handle certain types of premature instantiations.
4884 Remove_Dead_Instance
(N
);
4886 -- Create completing bodies for all subprogram declarations since
4887 -- their real bodies will not be instantiated.
4889 Provide_Completing_Bodies
(Instance_Spec
(N
));
4892 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4894 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4895 First_Private_Entity
(Act_Decl_Id
));
4897 -- If the instantiation will receive a body, the unit will be
4898 -- transformed into a package body, and receive its own elaboration
4899 -- entity. Otherwise, the nature of the unit is now a package
4902 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4903 and then not Needs_Body
4905 Rewrite
(N
, Act_Decl
);
4908 if Present
(Corresponding_Body
(Gen_Decl
))
4909 or else Unit_Requires_Body
(Gen_Unit
)
4911 Set_Has_Completion
(Act_Decl_Id
);
4914 Check_Formal_Packages
(Act_Decl_Id
);
4916 Restore_Hidden_Primitives
(Vis_Prims_List
);
4917 Restore_Private_Views
(Act_Decl_Id
);
4919 Inherit_Context
(Gen_Decl
, N
);
4921 if Parent_Installed
then
4926 Env_Installed
:= False;
4929 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4931 -- There used to be a check here to prevent instantiations in local
4932 -- contexts if the No_Local_Allocators restriction was active. This
4933 -- check was removed by a binding interpretation in AI-95-00130/07,
4934 -- but we retain the code for documentation purposes.
4936 -- if Ekind (Act_Decl_Id) /= E_Void
4937 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4939 -- Check_Restriction (No_Local_Allocators, N);
4943 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4946 -- Check that if N is an instantiation of System.Dim_Float_IO or
4947 -- System.Dim_Integer_IO, the formal type has a dimension system.
4949 if Nkind
(N
) = N_Package_Instantiation
4950 and then Is_Dim_IO_Package_Instantiation
(N
)
4953 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4955 if not Has_Dimension_System
4956 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4958 Error_Msg_N
("type with a dimension system expected", Assoc
);
4964 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4965 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4968 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4969 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
4970 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4971 Style_Check
:= Saved_Style_Check
;
4974 when Instantiation_Error
=>
4975 if Parent_Installed
then
4979 if Env_Installed
then
4983 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4984 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
4985 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4986 Style_Check
:= Saved_Style_Check
;
4987 end Analyze_Package_Instantiation
;
4989 --------------------------
4990 -- Inline_Instance_Body --
4991 --------------------------
4993 -- WARNING: This routine manages SPARK regions. Return statements must be
4994 -- replaced by gotos which jump to the end of the routine and restore the
4997 procedure Inline_Instance_Body
4999 Gen_Unit
: Entity_Id
;
5002 Config_Attrs
: constant Config_Switches_Type
:= Save_Config_Switches
;
5004 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5005 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
5006 Gen_Comp
: constant Entity_Id
:=
5007 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
5009 Scope_Stack_Depth
: constant Pos
:=
5010 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
5012 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5013 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
5014 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
5016 Curr_Scope
: Entity_Id
:= Empty
;
5017 List
: Elist_Id
:= No_Elist
; -- init to avoid warning
5018 N_Instances
: Nat
:= 0;
5019 Num_Inner
: Nat
:= 0;
5020 Num_Scopes
: Nat
:= 0;
5021 Removed
: Boolean := False;
5026 -- Case of generic unit defined in another unit. We must remove the
5027 -- complete context of the current unit to install that of the generic.
5029 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
5031 -- Loop through enclosing scopes until we reach a generic instance,
5032 -- package body, or subprogram.
5035 while Present
(S
) and then S
/= Standard_Standard
loop
5037 -- Save use clauses from enclosing scopes into Use_Clauses
5040 Num_Scopes
:= Num_Scopes
+ 1;
5042 Use_Clauses
(Num_Scopes
) :=
5044 (Scope_Stack
.Last
- Num_Scopes
+ 1).First_Use_Clause
);
5045 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
5047 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
5048 or else Scope_Stack
.Table
5049 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
5052 exit when Is_Generic_Instance
(S
)
5053 and then (In_Package_Body
(S
)
5054 or else Ekind
(S
) = E_Procedure
5055 or else Ekind
(S
) = E_Function
);
5059 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
5061 -- Find and save all enclosing instances
5066 and then S
/= Standard_Standard
5068 if Is_Generic_Instance
(S
) then
5069 N_Instances
:= N_Instances
+ 1;
5070 Instances
(N_Instances
) := S
;
5072 exit when In_Package_Body
(S
);
5078 -- Remove context of current compilation unit, unless we are within a
5079 -- nested package instantiation, in which case the context has been
5080 -- removed previously.
5082 -- If current scope is the body of a child unit, remove context of
5083 -- spec as well. If an enclosing scope is an instance body, the
5084 -- context has already been removed, but the entities in the body
5085 -- must be made invisible as well.
5088 while Present
(S
) and then S
/= Standard_Standard
loop
5089 if Is_Generic_Instance
(S
)
5090 and then (In_Package_Body
(S
)
5091 or else Ekind
(S
) in E_Procedure | E_Function
)
5093 -- We still have to remove the entities of the enclosing
5094 -- instance from direct visibility.
5099 E
:= First_Entity
(S
);
5100 while Present
(E
) loop
5101 Set_Is_Immediately_Visible
(E
, False);
5110 or else (Ekind
(Curr_Unit
) = E_Package_Body
5111 and then S
= Spec_Entity
(Curr_Unit
))
5112 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
5113 and then S
= Corresponding_Spec
5114 (Unit_Declaration_Node
(Curr_Unit
)))
5118 -- Remove entities in current scopes from visibility, so that
5119 -- instance body is compiled in a clean environment.
5121 List
:= Save_Scope_Stack
(Handle_Use
=> False);
5123 if Is_Child_Unit
(S
) then
5125 -- Remove child unit from stack, as well as inner scopes.
5126 -- Removing the context of a child unit removes parent units
5129 while Current_Scope
/= S
loop
5130 Num_Inner
:= Num_Inner
+ 1;
5131 Inner_Scopes
(Num_Inner
) := Current_Scope
;
5136 Remove_Context
(Curr_Comp
);
5140 Remove_Context
(Curr_Comp
);
5143 if Ekind
(Curr_Unit
) = E_Package_Body
then
5144 Remove_Context
(Library_Unit
(Curr_Comp
));
5151 pragma Assert
(Num_Inner
< Num_Scopes
);
5153 Push_Scope
(Standard_Standard
);
5154 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
5156 -- The inlined package body is analyzed with the configuration state
5157 -- of the context prior to the scope manipulations performed above.
5159 -- ??? shouldn't this also use the warning state of the context prior
5160 -- to the scope manipulations?
5162 Instantiate_Package_Body
5164 ((Act_Decl
=> Act_Decl
,
5165 Config_Switches
=> Config_Attrs
,
5166 Current_Sem_Unit
=> Current_Sem_Unit
,
5167 Expander_Status
=> Expander_Active
,
5169 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5170 Scope_Suppress
=> Scope_Suppress
,
5171 Warnings
=> Save_Warnings
)),
5172 Inlined_Body
=> True);
5178 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
5180 -- Reset Generic_Instance flag so that use clauses can be installed
5181 -- in the proper order. (See Use_One_Package for effect of enclosing
5182 -- instances on processing of use clauses).
5184 for J
in 1 .. N_Instances
loop
5185 Set_Is_Generic_Instance
(Instances
(J
), False);
5189 Install_Context
(Curr_Comp
, Chain
=> False);
5191 if Present
(Curr_Scope
)
5192 and then Is_Child_Unit
(Curr_Scope
)
5194 Push_Scope
(Curr_Scope
);
5195 Set_Is_Immediately_Visible
(Curr_Scope
);
5197 -- Finally, restore inner scopes as well
5199 for J
in reverse 1 .. Num_Inner
loop
5200 Push_Scope
(Inner_Scopes
(J
));
5204 Restore_Scope_Stack
(List
, Handle_Use
=> False);
5206 if Present
(Curr_Scope
)
5208 (In_Private_Part
(Curr_Scope
)
5209 or else In_Package_Body
(Curr_Scope
))
5211 -- Install private declaration of ancestor units, which are
5212 -- currently available. Restore_Scope_Stack and Install_Context
5213 -- only install the visible part of parents.
5218 Par
:= Scope
(Curr_Scope
);
5219 while (Present
(Par
)) and then Par
/= Standard_Standard
loop
5220 Install_Private_Declarations
(Par
);
5227 -- Restore use clauses. For a child unit, use clauses in the parents
5228 -- are restored when installing the context, so only those in inner
5229 -- scopes (and those local to the child unit itself) need to be
5230 -- installed explicitly.
5232 if Is_Child_Unit
(Curr_Unit
) and then Removed
then
5233 for J
in reverse 1 .. Num_Inner
+ 1 loop
5234 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5236 Install_Use_Clauses
(Use_Clauses
(J
));
5240 for J
in reverse 1 .. Num_Scopes
loop
5241 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5243 Install_Use_Clauses
(Use_Clauses
(J
));
5247 -- Restore status of instances. If one of them is a body, make its
5248 -- local entities visible again.
5255 for J
in 1 .. N_Instances
loop
5256 Inst
:= Instances
(J
);
5257 Set_Is_Generic_Instance
(Inst
, True);
5259 if In_Package_Body
(Inst
)
5260 or else Ekind
(S
) in E_Procedure | E_Function
5262 E
:= First_Entity
(Instances
(J
));
5263 while Present
(E
) loop
5264 Set_Is_Immediately_Visible
(E
);
5271 -- If generic unit is in current unit, current context is correct. Note
5272 -- that the context is guaranteed to carry the correct SPARK_Mode as no
5273 -- enclosing scopes were removed.
5276 Instantiate_Package_Body
5278 ((Act_Decl
=> Act_Decl
,
5279 Config_Switches
=> Save_Config_Switches
,
5280 Current_Sem_Unit
=> Current_Sem_Unit
,
5281 Expander_Status
=> Expander_Active
,
5283 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5284 Scope_Suppress
=> Scope_Suppress
,
5285 Warnings
=> Save_Warnings
)),
5286 Inlined_Body
=> True);
5288 end Inline_Instance_Body
;
5290 -------------------------------------
5291 -- Analyze_Procedure_Instantiation --
5292 -------------------------------------
5294 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
5296 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
5297 end Analyze_Procedure_Instantiation
;
5299 -----------------------------------
5300 -- Need_Subprogram_Instance_Body --
5301 -----------------------------------
5303 function Need_Subprogram_Instance_Body
5305 Subp
: Entity_Id
) return Boolean
5307 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean;
5308 -- Return True if E is an inlined subprogram, an inlined renaming or a
5309 -- subprogram nested in an inlined subprogram. The inlining machinery
5310 -- totally disregards nested subprograms since it considers that they
5311 -- will always be compiled if the parent is (see Inline.Is_Nested).
5313 ------------------------------------
5314 -- Is_Inlined_Or_Child_Of_Inlined --
5315 ------------------------------------
5317 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean is
5321 if Is_Inlined
(E
) or else Is_Inlined
(Alias
(E
)) then
5326 while Scop
/= Standard_Standard
loop
5327 if Is_Subprogram
(Scop
) and then Is_Inlined
(Scop
) then
5331 Scop
:= Scope
(Scop
);
5335 end Is_Inlined_Or_Child_Of_Inlined
;
5338 -- Must be in the main unit or inlined (or child of inlined)
5340 if (Is_In_Main_Unit
(N
) or else Is_Inlined_Or_Child_Of_Inlined
(Subp
))
5342 -- Must be generating code or analyzing code in GNATprove mode
5344 and then (Operating_Mode
= Generate_Code
5345 or else (Operating_Mode
= Check_Semantics
5346 and then GNATprove_Mode
))
5348 -- The body is needed when generating code (full expansion) and in
5349 -- in GNATprove mode (special expansion) for formal verification of
5352 and then (Expander_Active
or GNATprove_Mode
)
5354 -- No point in inlining if ABE is inevitable
5356 and then not Is_Known_Guaranteed_ABE
(N
)
5358 -- Or if subprogram is eliminated
5360 and then not Is_Eliminated
(Subp
)
5362 Add_Pending_Instantiation
(N
, Unit_Declaration_Node
(Subp
));
5365 -- Here if not inlined, or we ignore the inlining
5370 end Need_Subprogram_Instance_Body
;
5372 --------------------------------------
5373 -- Analyze_Subprogram_Instantiation --
5374 --------------------------------------
5376 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
5377 -- must be replaced by gotos which jump to the end of the routine in order
5378 -- to restore the Ghost and SPARK modes.
5380 procedure Analyze_Subprogram_Instantiation
5384 Errs
: constant Nat
:= Serious_Errors_Detected
;
5385 Gen_Id
: constant Node_Id
:= Name
(N
);
5386 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
5387 Anon_Id
: constant Entity_Id
:=
5388 Make_Defining_Identifier
(Sloc
(Inst_Id
),
5389 Chars
=> New_External_Name
(Chars
(Inst_Id
), 'R'));
5390 Loc
: constant Source_Ptr
:= Sloc
(N
);
5392 Act_Decl_Id
: Entity_Id
:= Empty
; -- init to avoid warning
5397 Env_Installed
: Boolean := False;
5398 Gen_Unit
: Entity_Id
;
5400 Pack_Id
: Entity_Id
;
5401 Parent_Installed
: Boolean := False;
5403 Renaming_List
: List_Id
;
5404 -- The list of declarations that link formals and actuals of the
5405 -- instance. These are subtype declarations for formal types, and
5406 -- renaming declarations for other formals. The subprogram declaration
5407 -- for the instance is then appended to the list, and the last item on
5408 -- the list is the renaming declaration for the instance.
5410 procedure Analyze_Instance_And_Renamings
;
5411 -- The instance must be analyzed in a context that includes the mappings
5412 -- of generic parameters into actuals. We create a package declaration
5413 -- for this purpose, and a subprogram with an internal name within the
5414 -- package. The subprogram instance is simply an alias for the internal
5415 -- subprogram, declared in the current scope.
5417 procedure Build_Subprogram_Renaming
;
5418 -- If the subprogram is recursive, there are occurrences of the name of
5419 -- the generic within the body, which must resolve to the current
5420 -- instance. We add a renaming declaration after the declaration, which
5421 -- is available in the instance body, as well as in the analysis of
5422 -- aspects that appear in the generic. This renaming declaration is
5423 -- inserted after the instance declaration which it renames.
5425 ------------------------------------
5426 -- Analyze_Instance_And_Renamings --
5427 ------------------------------------
5429 procedure Analyze_Instance_And_Renamings
is
5430 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
5431 Pack_Decl
: Node_Id
;
5434 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5436 -- For the case of a compilation unit, the container package has
5437 -- the same name as the instantiation, to insure that the binder
5438 -- calls the elaboration procedure with the right name. Copy the
5439 -- entity of the instance, which may have compilation level flags
5440 -- (e.g. Is_Child_Unit) set.
5442 Pack_Id
:= New_Copy
(Def_Ent
);
5445 -- Otherwise we use the name of the instantiation concatenated
5446 -- with its source position to ensure uniqueness if there are
5447 -- several instantiations with the same name.
5450 Make_Defining_Identifier
(Loc
,
5451 Chars
=> New_External_Name
5452 (Related_Id
=> Chars
(Def_Ent
),
5454 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
5458 Make_Package_Declaration
(Loc
,
5459 Specification
=> Make_Package_Specification
(Loc
,
5460 Defining_Unit_Name
=> Pack_Id
,
5461 Visible_Declarations
=> Renaming_List
,
5462 End_Label
=> Empty
));
5464 Set_Instance_Spec
(N
, Pack_Decl
);
5465 Set_Is_Generic_Instance
(Pack_Id
);
5466 Set_Debug_Info_Needed
(Pack_Id
);
5468 -- Case of not a compilation unit
5470 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5471 Mark_Rewrite_Insertion
(Pack_Decl
);
5472 Insert_Before
(N
, Pack_Decl
);
5473 Set_Has_Completion
(Pack_Id
);
5475 -- Case of an instantiation that is a compilation unit
5477 -- Place declaration on current node so context is complete for
5478 -- analysis (including nested instantiations), and for use in a
5479 -- context_clause (see Analyze_With_Clause).
5482 Set_Unit
(Parent
(N
), Pack_Decl
);
5483 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
5486 Analyze
(Pack_Decl
);
5487 Check_Formal_Packages
(Pack_Id
);
5489 -- Body of the enclosing package is supplied when instantiating the
5490 -- subprogram body, after semantic analysis is completed.
5492 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5494 -- Remove package itself from visibility, so it does not
5495 -- conflict with subprogram.
5497 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
5499 -- Set name and scope of internal subprogram so that the proper
5500 -- external name will be generated. The proper scope is the scope
5501 -- of the wrapper package. We need to generate debugging info for
5502 -- the internal subprogram, so set flag accordingly.
5504 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
5505 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
5507 -- Mark wrapper package as referenced, to avoid spurious warnings
5508 -- if the instantiation appears in various with_ clauses of
5509 -- subunits of the main unit.
5511 Set_Referenced
(Pack_Id
);
5514 Set_Is_Generic_Instance
(Anon_Id
);
5515 Set_Debug_Info_Needed
(Anon_Id
);
5516 Act_Decl_Id
:= New_Copy
(Anon_Id
);
5518 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5519 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5520 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5522 -- Subprogram instance comes from source only if generic does
5524 Preserve_Comes_From_Source
(Act_Decl_Id
, Gen_Unit
);
5526 -- If the instance is a child unit, mark the Id accordingly. Mark
5527 -- the anonymous entity as well, which is the real subprogram and
5528 -- which is used when the instance appears in a context clause.
5529 -- Similarly, propagate the Is_Eliminated flag to handle properly
5530 -- nested eliminated subprograms.
5532 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5533 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5534 New_Overloaded_Entity
(Act_Decl_Id
);
5535 Check_Eliminated
(Act_Decl_Id
);
5536 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5538 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5540 -- In compilation unit case, kill elaboration checks on the
5541 -- instantiation, since they are never needed - the body is
5542 -- instantiated at the same point as the spec.
5544 if Legacy_Elaboration_Checks
then
5545 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5546 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5549 Set_Is_Compilation_Unit
(Anon_Id
);
5550 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5553 -- The instance is not a freezing point for the new subprogram.
5554 -- The anonymous subprogram may have a freeze node, created for
5555 -- some delayed aspects. This freeze node must not be inherited
5556 -- by the visible subprogram entity.
5558 Set_Is_Frozen
(Act_Decl_Id
, False);
5559 Set_Freeze_Node
(Act_Decl_Id
, Empty
);
5561 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5562 Valid_Operator_Definition
(Act_Decl_Id
);
5565 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5566 Set_Has_Completion
(Act_Decl_Id
);
5567 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5569 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5570 Set_Body_Required
(Parent
(N
), False);
5572 end Analyze_Instance_And_Renamings
;
5574 -------------------------------
5575 -- Build_Subprogram_Renaming --
5576 -------------------------------
5578 procedure Build_Subprogram_Renaming
is
5579 Renaming_Decl
: Node_Id
;
5580 Unit_Renaming
: Node_Id
;
5584 Make_Subprogram_Renaming_Declaration
(Loc
,
5587 (Specification
(Original_Node
(Gen_Decl
)),
5589 Instantiating
=> True),
5590 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
5592 -- The generic may be a child unit. The renaming needs an identifier
5593 -- with the proper name.
5595 Set_Defining_Unit_Name
(Specification
(Unit_Renaming
),
5596 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)));
5598 -- If there is a formal subprogram with the same name as the unit
5599 -- itself, do not add this renaming declaration, to prevent
5600 -- ambiguities when there is a call with that name in the body.
5602 Renaming_Decl
:= First
(Renaming_List
);
5603 while Present
(Renaming_Decl
) loop
5604 if Nkind
(Renaming_Decl
) = N_Subprogram_Renaming_Declaration
5606 Chars
(Defining_Entity
(Renaming_Decl
)) = Chars
(Gen_Unit
)
5611 Next
(Renaming_Decl
);
5614 if No
(Renaming_Decl
) then
5615 Append
(Unit_Renaming
, Renaming_List
);
5617 end Build_Subprogram_Renaming
;
5621 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5622 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
5623 Saved_ISMP
: constant Boolean :=
5624 Ignore_SPARK_Mode_Pragmas_In_Instance
;
5625 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5626 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5627 -- Save the Ghost and SPARK mode-related data to restore on exit
5629 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5630 -- List of primitives made temporarily visible in the instantiation
5631 -- to match the visibility of the formal type
5633 -- Start of processing for Analyze_Subprogram_Instantiation
5636 -- Preserve relevant elaboration-related attributes of the context which
5637 -- are no longer available or very expensive to recompute once analysis,
5638 -- resolution, and expansion are over.
5640 Mark_Elaboration_Attributes
5647 -- Very first thing: check for special Text_IO unit in case we are
5648 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5649 -- such an instantiation is bogus (these are packages, not subprograms),
5650 -- but we get a better error message if we do this.
5652 Check_Text_IO_Special_Unit
(Gen_Id
);
5654 -- Make node global for error reporting
5656 Instantiation_Node
:= N
;
5658 -- For package instantiations we turn off style checks, because they
5659 -- will have been emitted in the generic. For subprogram instantiations
5660 -- we want to apply at least the check on overriding indicators so we
5661 -- do not modify the style check status.
5663 -- The renaming declarations for the actuals do not come from source and
5664 -- will not generate spurious warnings.
5666 Preanalyze_Actuals
(N
);
5669 Env_Installed
:= True;
5670 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5671 Gen_Unit
:= Entity
(Gen_Id
);
5673 -- A subprogram instantiation is Ghost when it is subject to pragma
5674 -- Ghost or the generic template is Ghost. Set the mode now to ensure
5675 -- that any nodes generated during analysis and expansion are marked as
5678 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
5680 Generate_Reference
(Gen_Unit
, Gen_Id
);
5682 if Nkind
(Gen_Id
) = N_Identifier
5683 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5686 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5689 if Etype
(Gen_Unit
) = Any_Type
then
5694 -- Verify that it is a generic subprogram of the right kind, and that
5695 -- it does not lead to a circular instantiation.
5697 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5699 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5701 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5703 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5705 elsif In_Open_Scopes
(Gen_Unit
) then
5706 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5709 Mutate_Ekind
(Inst_Id
, K
);
5710 Set_Scope
(Inst_Id
, Current_Scope
);
5712 Set_Entity
(Gen_Id
, Gen_Unit
);
5713 Set_Is_Instantiated
(Gen_Unit
);
5715 if In_Extended_Main_Source_Unit
(N
) then
5716 Generate_Reference
(Gen_Unit
, N
);
5719 -- If renaming, get original unit
5721 if Present
(Renamed_Entity
(Gen_Unit
))
5722 and then Is_Generic_Subprogram
(Renamed_Entity
(Gen_Unit
))
5724 Gen_Unit
:= Renamed_Entity
(Gen_Unit
);
5725 Set_Is_Instantiated
(Gen_Unit
);
5726 Generate_Reference
(Gen_Unit
, N
);
5729 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5730 Error_Msg_Node_2
:= Current_Scope
;
5732 ("circular instantiation: & instantiated in &!", N
, Gen_Unit
);
5733 Circularity_Detected
:= True;
5734 Restore_Hidden_Primitives
(Vis_Prims_List
);
5738 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5740 -- Initialize renamings map, for error checking
5742 Generic_Renamings
.Set_Last
(0);
5743 Generic_Renamings_HTable
.Reset
;
5745 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
5747 -- Copy original generic tree, to produce text for instantiation
5751 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5753 -- Inherit overriding indicator from instance node
5755 Act_Spec
:= Specification
(Act_Tree
);
5756 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5757 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5760 Analyze_Associations
5762 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5763 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5765 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5767 -- The subprogram itself cannot contain a nested instance, so the
5768 -- current parent is left empty.
5770 Set_Instance_Env
(Gen_Unit
, Empty
);
5772 -- Build the subprogram declaration, which does not appear in the
5773 -- generic template, and give it a sloc consistent with that of the
5776 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5777 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5779 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5780 Specification
=> Act_Spec
);
5782 -- The aspects have been copied previously, but they have to be
5783 -- linked explicitly to the new subprogram declaration. Explicit
5784 -- pre/postconditions on the instance are analyzed below, in a
5787 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5788 Set_Categorization_From_Pragmas
(Act_Decl
);
5790 if Parent_Installed
then
5794 Append
(Act_Decl
, Renaming_List
);
5796 -- Contract-related source pragmas that follow a generic subprogram
5797 -- must be instantiated explicitly because they are not part of the
5798 -- subprogram template.
5800 Instantiate_Subprogram_Contract
5801 (Original_Node
(Gen_Decl
), Renaming_List
);
5803 Build_Subprogram_Renaming
;
5805 -- If the context of the instance is subject to SPARK_Mode "off" or
5806 -- the annotation is altogether missing, set the global flag which
5807 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5808 -- the instance. This should be done prior to analyzing the instance.
5810 if SPARK_Mode
/= On
then
5811 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
5814 -- If the context of an instance is not subject to SPARK_Mode "off",
5815 -- and the generic spec is subject to an explicit SPARK_Mode pragma,
5816 -- the latter should be the one applicable to the instance.
5818 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5819 and then Saved_SM
/= Off
5820 and then Present
(SPARK_Pragma
(Gen_Unit
))
5822 Set_SPARK_Mode
(Gen_Unit
);
5825 -- Need to mark Anon_Id intrinsic before calling
5826 -- Analyze_Instance_And_Renamings because this flag may be propagated
5829 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5830 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5831 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
5834 Analyze_Instance_And_Renamings
;
5836 -- Restore SPARK_Mode from the context after analysis of the package
5837 -- declaration, so that the SPARK_Mode on the generic spec does not
5838 -- apply to the pending instance for the instance body.
5840 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5841 and then Saved_SM
/= Off
5842 and then Present
(SPARK_Pragma
(Gen_Unit
))
5844 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5847 -- If the generic is marked Import (Intrinsic), then so is the
5848 -- instance; this indicates that there is no body to instantiate.
5849 -- We also copy the interface name in case this is handled by the
5850 -- back-end and deal with an instance of unchecked conversion.
5852 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5853 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5854 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
5856 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5857 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5861 -- Inherit convention from generic unit. Intrinsic convention, as for
5862 -- an instance of unchecked conversion, is not inherited because an
5863 -- explicit Ada instance has been created.
5865 if Has_Convention_Pragma
(Gen_Unit
)
5866 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5868 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5869 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5872 Generate_Definition
(Act_Decl_Id
);
5874 -- Inherit all inlining-related flags which apply to the generic in
5875 -- the subprogram and its declaration.
5877 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5878 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5880 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5881 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5883 Set_Has_Pragma_Inline_Always
5884 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5885 Set_Has_Pragma_Inline_Always
5886 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5888 Set_Has_Pragma_No_Inline
5889 (Act_Decl_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5890 Set_Has_Pragma_No_Inline
5891 (Anon_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5893 -- Propagate No_Return if pragma applied to generic unit. This must
5894 -- be done explicitly because pragma does not appear in generic
5895 -- declaration (unlike the aspect case).
5897 if No_Return
(Gen_Unit
) then
5898 Set_No_Return
(Act_Decl_Id
);
5899 Set_No_Return
(Anon_Id
);
5902 -- Mark both the instance spec and the anonymous package in case the
5903 -- body is instantiated at a later pass. This preserves the original
5904 -- context in effect for the body.
5906 if SPARK_Mode
/= On
then
5907 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
5908 Set_Ignore_SPARK_Mode_Pragmas
(Anon_Id
);
5911 if Legacy_Elaboration_Checks
5912 and then not Is_Intrinsic_Subprogram
(Gen_Unit
)
5914 Check_Elab_Instantiation
(N
);
5917 -- Save the scenario for later examination by the ABE Processing
5920 Record_Elaboration_Scenario
(N
);
5922 -- The instantiation results in a guaranteed ABE. Create a completing
5923 -- body for the subprogram declaration because the real body will not
5926 if Is_Known_Guaranteed_ABE
(N
) then
5927 Provide_Completing_Bodies
(Instance_Spec
(N
));
5930 if Is_Dispatching_Operation
(Act_Decl_Id
)
5931 and then Ada_Version
>= Ada_2005
5937 Formal
:= First_Formal
(Act_Decl_Id
);
5938 while Present
(Formal
) loop
5939 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
5940 and then Is_Controlling_Formal
(Formal
)
5941 and then not Can_Never_Be_Null
(Formal
)
5944 ("access parameter& is controlling,", N
, Formal
);
5946 ("\corresponding parameter of & must be explicitly "
5947 & "null-excluding", N
, Gen_Id
);
5950 Next_Formal
(Formal
);
5955 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
5957 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5959 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
5960 Inherit_Context
(Gen_Decl
, N
);
5962 Restore_Private_Views
(Pack_Id
, False);
5964 -- If the context requires a full instantiation, mark node for
5965 -- subsequent construction of the body.
5967 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
5968 Check_Forward_Instantiation
(Gen_Decl
);
5970 -- The wrapper package is always delayed, because it does not
5971 -- constitute a freeze point, but to insure that the freeze node
5972 -- is placed properly, it is created directly when instantiating
5973 -- the body (otherwise the freeze node might appear to early for
5974 -- nested instantiations).
5976 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5977 Rewrite
(N
, Unit
(Parent
(N
)));
5978 Set_Unit
(Parent
(N
), N
);
5981 -- Replace instance node for library-level instantiations of
5982 -- intrinsic subprograms.
5984 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5985 Rewrite
(N
, Unit
(Parent
(N
)));
5986 Set_Unit
(Parent
(N
), N
);
5989 if Parent_Installed
then
5993 Restore_Hidden_Primitives
(Vis_Prims_List
);
5995 Env_Installed
:= False;
5996 Generic_Renamings
.Set_Last
(0);
5997 Generic_Renamings_HTable
.Reset
;
6001 -- Analyze aspects in declaration if no errors appear in the instance.
6003 if Has_Aspects
(N
) and then Serious_Errors_Detected
= Errs
then
6004 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
6007 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6008 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6009 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6012 when Instantiation_Error
=>
6013 if Parent_Installed
then
6017 if Env_Installed
then
6021 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
6022 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
6023 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
6024 end Analyze_Subprogram_Instantiation
;
6026 -------------------------
6027 -- Get_Associated_Node --
6028 -------------------------
6030 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
6034 Assoc
:= Associated_Node
(N
);
6036 if Nkind
(Assoc
) /= Nkind
(N
) then
6039 elsif Nkind
(Assoc
) in N_Aggregate | N_Extension_Aggregate
then
6043 -- If the node is part of an inner generic, it may itself have been
6044 -- remapped into a further generic copy. Associated_Node is otherwise
6045 -- used for the entity of the node, and will be of a different node
6046 -- kind, or else N has been rewritten as a literal or function call.
6048 while Present
(Associated_Node
(Assoc
))
6049 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
6051 Assoc
:= Associated_Node
(Assoc
);
6054 -- Follow an additional link in case the final node was rewritten.
6055 -- This can only happen with nested generic units.
6057 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
6058 and then Present
(Associated_Node
(Assoc
))
6059 and then Nkind
(Associated_Node
(Assoc
)) in N_Function_Call
6060 | N_Explicit_Dereference
6065 Assoc
:= Associated_Node
(Assoc
);
6068 -- An additional special case: an unconstrained type in an object
6069 -- declaration may have been rewritten as a local subtype constrained
6070 -- by the expression in the declaration. We need to recover the
6071 -- original entity, which may be global.
6073 if Present
(Original_Node
(Assoc
))
6074 and then Nkind
(Parent
(N
)) = N_Object_Declaration
6076 Assoc
:= Original_Node
(Assoc
);
6081 end Get_Associated_Node
;
6083 ----------------------------
6084 -- Build_Function_Wrapper --
6085 ----------------------------
6087 function Build_Function_Wrapper
6088 (Formal_Subp
: Entity_Id
;
6089 Actual_Subp
: Entity_Id
) return Node_Id
6091 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6092 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6095 Func_Name
: Node_Id
;
6097 Parm_Type
: Node_Id
;
6098 Profile
: List_Id
:= New_List
;
6105 Func_Name
:= New_Occurrence_Of
(Actual_Subp
, Loc
);
6107 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
6108 Mutate_Ekind
(Func
, E_Function
);
6109 Set_Is_Generic_Actual_Subprogram
(Func
);
6111 Actuals
:= New_List
;
6112 Profile
:= New_List
;
6114 Act_F
:= First_Formal
(Actual_Subp
);
6115 Form_F
:= First_Formal
(Formal_Subp
);
6116 while Present
(Form_F
) loop
6118 -- Create new formal for profile of wrapper, and add a reference
6119 -- to it in the list of actuals for the enclosing call. The name
6120 -- must be that of the formal in the formal subprogram, because
6121 -- calls to it in the generic body may use named associations.
6123 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
6126 New_Occurrence_Of
(Get_Instance_Of
(Etype
(Form_F
)), Loc
);
6129 Make_Parameter_Specification
(Loc
,
6130 Defining_Identifier
=> New_F
,
6131 Parameter_Type
=> Parm_Type
));
6133 Append_To
(Actuals
, New_Occurrence_Of
(New_F
, Loc
));
6134 Next_Formal
(Form_F
);
6136 if Present
(Act_F
) then
6137 Next_Formal
(Act_F
);
6142 Make_Function_Specification
(Loc
,
6143 Defining_Unit_Name
=> Func
,
6144 Parameter_Specifications
=> Profile
,
6145 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6148 Make_Expression_Function
(Loc
,
6149 Specification
=> Spec
,
6151 Make_Function_Call
(Loc
,
6153 Parameter_Associations
=> Actuals
));
6156 end Build_Function_Wrapper
;
6158 ----------------------------
6159 -- Build_Operator_Wrapper --
6160 ----------------------------
6162 function Build_Operator_Wrapper
6163 (Formal_Subp
: Entity_Id
;
6164 Actual_Subp
: Entity_Id
) return Node_Id
6166 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6167 Ret_Type
: constant Entity_Id
:=
6168 Get_Instance_Of
(Etype
(Formal_Subp
));
6169 Op_Type
: constant Entity_Id
:=
6170 Get_Instance_Of
(Etype
(First_Formal
(Formal_Subp
)));
6171 Is_Binary
: constant Boolean :=
6172 Present
(Next_Formal
(First_Formal
(Formal_Subp
)));
6175 Expr
: Node_Id
:= Empty
;
6183 Op_Name
:= Chars
(Actual_Subp
);
6185 -- Create entities for wrapper function and its formals
6187 F1
:= Make_Temporary
(Loc
, 'A');
6188 F2
:= Make_Temporary
(Loc
, 'B');
6189 L
:= New_Occurrence_Of
(F1
, Loc
);
6190 R
:= New_Occurrence_Of
(F2
, Loc
);
6192 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
6193 Mutate_Ekind
(Func
, E_Function
);
6194 Set_Is_Generic_Actual_Subprogram
(Func
);
6197 Make_Function_Specification
(Loc
,
6198 Defining_Unit_Name
=> Func
,
6199 Parameter_Specifications
=> New_List
(
6200 Make_Parameter_Specification
(Loc
,
6201 Defining_Identifier
=> F1
,
6202 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
))),
6203 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6206 Append_To
(Parameter_Specifications
(Spec
),
6207 Make_Parameter_Specification
(Loc
,
6208 Defining_Identifier
=> F2
,
6209 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
)));
6212 -- Build expression as a function call, or as an operator node
6213 -- that corresponds to the name of the actual, starting with
6214 -- binary operators.
6216 if Op_Name
not in Any_Operator_Name
then
6218 Make_Function_Call
(Loc
,
6220 New_Occurrence_Of
(Actual_Subp
, Loc
),
6221 Parameter_Associations
=> New_List
(L
));
6224 Append_To
(Parameter_Associations
(Expr
), R
);
6229 elsif Is_Binary
then
6230 if Op_Name
= Name_Op_And
then
6231 Expr
:= Make_Op_And
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6232 elsif Op_Name
= Name_Op_Or
then
6233 Expr
:= Make_Op_Or
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6234 elsif Op_Name
= Name_Op_Xor
then
6235 Expr
:= Make_Op_Xor
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6236 elsif Op_Name
= Name_Op_Eq
then
6237 Expr
:= Make_Op_Eq
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6238 elsif Op_Name
= Name_Op_Ne
then
6239 Expr
:= Make_Op_Ne
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6240 elsif Op_Name
= Name_Op_Le
then
6241 Expr
:= Make_Op_Le
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6242 elsif Op_Name
= Name_Op_Gt
then
6243 Expr
:= Make_Op_Gt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6244 elsif Op_Name
= Name_Op_Ge
then
6245 Expr
:= Make_Op_Ge
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6246 elsif Op_Name
= Name_Op_Lt
then
6247 Expr
:= Make_Op_Lt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6248 elsif Op_Name
= Name_Op_Add
then
6249 Expr
:= Make_Op_Add
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6250 elsif Op_Name
= Name_Op_Subtract
then
6251 Expr
:= Make_Op_Subtract
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6252 elsif Op_Name
= Name_Op_Concat
then
6253 Expr
:= Make_Op_Concat
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6254 elsif Op_Name
= Name_Op_Multiply
then
6255 Expr
:= Make_Op_Multiply
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6256 elsif Op_Name
= Name_Op_Divide
then
6257 Expr
:= Make_Op_Divide
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6258 elsif Op_Name
= Name_Op_Mod
then
6259 Expr
:= Make_Op_Mod
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6260 elsif Op_Name
= Name_Op_Rem
then
6261 Expr
:= Make_Op_Rem
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6262 elsif Op_Name
= Name_Op_Expon
then
6263 Expr
:= Make_Op_Expon
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6269 if Op_Name
= Name_Op_Add
then
6270 Expr
:= Make_Op_Plus
(Loc
, Right_Opnd
=> L
);
6271 elsif Op_Name
= Name_Op_Subtract
then
6272 Expr
:= Make_Op_Minus
(Loc
, Right_Opnd
=> L
);
6273 elsif Op_Name
= Name_Op_Abs
then
6274 Expr
:= Make_Op_Abs
(Loc
, Right_Opnd
=> L
);
6275 elsif Op_Name
= Name_Op_Not
then
6276 Expr
:= Make_Op_Not
(Loc
, Right_Opnd
=> L
);
6281 Make_Expression_Function
(Loc
,
6282 Specification
=> Spec
,
6283 Expression
=> Expr
);
6286 end Build_Operator_Wrapper
;
6288 -----------------------------------
6289 -- Build_Subprogram_Decl_Wrapper --
6290 -----------------------------------
6292 function Build_Subprogram_Decl_Wrapper
6293 (Formal_Subp
: Entity_Id
) return Node_Id
6295 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6296 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6299 Parm_Spec
: Node_Id
;
6300 Profile
: List_Id
:= New_List
;
6307 Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
6308 Mutate_Ekind
(Subp
, Ekind
(Formal_Subp
));
6309 Set_Is_Generic_Actual_Subprogram
(Subp
);
6311 Profile
:= Parameter_Specifications
(
6313 (Specification
(Unit_Declaration_Node
(Formal_Subp
))));
6315 Form_F
:= First_Formal
(Formal_Subp
);
6316 Parm_Spec
:= First
(Profile
);
6318 -- Create new entities for the formals. Reset entities so that
6319 -- parameter types are properly resolved when wrapper declaration
6322 while Present
(Parm_Spec
) loop
6323 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
6324 Set_Defining_Identifier
(Parm_Spec
, New_F
);
6325 Set_Entity
(Parameter_Type
(Parm_Spec
), Empty
);
6327 Next_Formal
(Form_F
);
6330 if Ret_Type
= Standard_Void_Type
then
6332 Make_Procedure_Specification
(Loc
,
6333 Defining_Unit_Name
=> Subp
,
6334 Parameter_Specifications
=> Profile
);
6337 Make_Function_Specification
(Loc
,
6338 Defining_Unit_Name
=> Subp
,
6339 Parameter_Specifications
=> Profile
,
6340 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6344 Make_Subprogram_Declaration
(Loc
, Specification
=> Spec
);
6347 end Build_Subprogram_Decl_Wrapper
;
6349 -----------------------------------
6350 -- Build_Subprogram_Body_Wrapper --
6351 -----------------------------------
6353 function Build_Subprogram_Body_Wrapper
6354 (Formal_Subp
: Entity_Id
;
6355 Actual_Name
: Node_Id
) return Node_Id
6357 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
6358 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
6359 Spec_Node
: constant Node_Id
:=
6361 (Build_Subprogram_Decl_Wrapper
(Formal_Subp
));
6364 Body_Node
: Node_Id
;
6367 Actuals
:= New_List
;
6368 Act
:= First
(Parameter_Specifications
(Spec_Node
));
6370 while Present
(Act
) loop
6372 Make_Identifier
(Loc
, Chars
(Defining_Identifier
(Act
))));
6376 if Ret_Type
= Standard_Void_Type
then
6377 Stmt
:= Make_Procedure_Call_Statement
(Loc
,
6378 Name
=> Actual_Name
,
6379 Parameter_Associations
=> Actuals
);
6382 Stmt
:= Make_Simple_Return_Statement
(Loc
,
6384 Make_Function_Call
(Loc
,
6385 Name
=> Actual_Name
,
6386 Parameter_Associations
=> Actuals
));
6389 Body_Node
:= Make_Subprogram_Body
(Loc
,
6390 Specification
=> Spec_Node
,
6391 Declarations
=> New_List
,
6392 Handled_Statement_Sequence
=>
6393 Make_Handled_Sequence_Of_Statements
(Loc
,
6394 Statements
=> New_List
(Stmt
)));
6397 end Build_Subprogram_Body_Wrapper
;
6399 -------------------------------------------
6400 -- Build_Instance_Compilation_Unit_Nodes --
6401 -------------------------------------------
6403 procedure Build_Instance_Compilation_Unit_Nodes
6408 Decl_Cunit
: Node_Id
;
6409 Body_Cunit
: Node_Id
;
6411 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
6412 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
6415 -- A new compilation unit node is built for the instance declaration
6418 Make_Compilation_Unit
(Sloc
(N
),
6419 Context_Items
=> Empty_List
,
6421 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
6423 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
6425 -- The new compilation unit is linked to its body, but both share the
6426 -- same file, so we do not set Body_Required on the new unit so as not
6427 -- to create a spurious dependency on a non-existent body in the ali.
6428 -- This simplifies CodePeer unit traversal.
6430 -- We use the original instantiation compilation unit as the resulting
6431 -- compilation unit of the instance, since this is the main unit.
6433 Rewrite
(N
, Act_Body
);
6435 -- Propagate the aspect specifications from the package body template to
6436 -- the instantiated version of the package body.
6438 if Has_Aspects
(Act_Body
) then
6439 Set_Aspect_Specifications
6440 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
6443 Body_Cunit
:= Parent
(N
);
6445 -- The two compilation unit nodes are linked by the Library_Unit field
6447 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
6448 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
6450 -- Preserve the private nature of the package if needed
6452 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
6454 -- If the instance is not the main unit, its context, categorization
6455 -- and elaboration entity are not relevant to the compilation.
6457 if Body_Cunit
/= Cunit
(Main_Unit
) then
6458 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
6462 -- The context clause items on the instantiation, which are now attached
6463 -- to the body compilation unit (since the body overwrote the original
6464 -- instantiation node), semantically belong on the spec, so copy them
6465 -- there. It's harmless to leave them on the body as well. In fact one
6466 -- could argue that they belong in both places.
6468 Citem
:= First
(Context_Items
(Body_Cunit
));
6469 while Present
(Citem
) loop
6470 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
6474 -- Propagate categorization flags on packages, so that they appear in
6475 -- the ali file for the spec of the unit.
6477 if Ekind
(New_Main
) = E_Package
then
6478 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
6479 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
6480 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
6481 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
6482 Set_Is_Remote_Call_Interface
6483 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
6486 -- Make entry in Units table, so that binder can generate call to
6487 -- elaboration procedure for body, if any.
6489 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
6490 Main_Unit_Entity
:= New_Main
;
6491 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
6493 -- Build elaboration entity, since the instance may certainly generate
6494 -- elaboration code requiring a flag for protection.
6496 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
6497 end Build_Instance_Compilation_Unit_Nodes
;
6499 -----------------------------
6500 -- Check_Access_Definition --
6501 -----------------------------
6503 procedure Check_Access_Definition
(N
: Node_Id
) is
6506 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
6508 end Check_Access_Definition
;
6510 -----------------------------------
6511 -- Check_Formal_Package_Instance --
6512 -----------------------------------
6514 -- If the formal has specific parameters, they must match those of the
6515 -- actual. Both of them are instances, and the renaming declarations for
6516 -- their formal parameters appear in the same order in both. The analyzed
6517 -- formal has been analyzed in the context of the current instance.
6519 procedure Check_Formal_Package_Instance
6520 (Formal_Pack
: Entity_Id
;
6521 Actual_Pack
: Entity_Id
)
6523 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
6524 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
6525 Prev_E1
: Entity_Id
;
6530 procedure Check_Mismatch
(B
: Boolean);
6531 -- Common error routine for mismatch between the parameters of the
6532 -- actual instance and those of the formal package.
6534 function Is_Defaulted
(Param
: Entity_Id
) return Boolean;
6535 -- If the formal package has partly box-initialized formals, skip
6536 -- conformance check for these formals. Previously the code assumed
6537 -- that box initialization for a formal package applied to all its
6538 -- formal parameters.
6540 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
6541 -- The formal may come from a nested formal package, and the actual may
6542 -- have been constant-folded. To determine whether the two denote the
6543 -- same entity we may have to traverse several definitions to recover
6544 -- the ultimate entity that they refer to.
6546 function Same_Instantiated_Function
(E1
, E2
: Entity_Id
) return Boolean;
6547 -- The formal and the actual must be identical, but if both are
6548 -- given by attributes they end up renaming different generated bodies,
6549 -- and we must verify that the attributes themselves match.
6551 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
6552 -- Similarly, if the formal comes from a nested formal package, the
6553 -- actual may designate the formal through multiple renamings, which
6554 -- have to be followed to determine the original variable in question.
6556 --------------------
6557 -- Check_Mismatch --
6558 --------------------
6560 procedure Check_Mismatch
(B
: Boolean) is
6561 -- A Formal_Type_Declaration for a derived private type is rewritten
6562 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
6563 -- which is why we examine the original node.
6565 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(Parent
(E2
)));
6568 if Kind
= N_Formal_Type_Declaration
then
6571 elsif Kind
in N_Formal_Object_Declaration
6572 | N_Formal_Package_Declaration
6573 | N_Formal_Subprogram_Declaration
6577 -- Ada 2012: If both formal and actual are incomplete types they
6580 elsif Is_Incomplete_Type
(E1
) and then Is_Incomplete_Type
(E2
) then
6585 ("actual for & in actual instance does not match formal",
6586 Parent
(Actual_Pack
), E1
);
6594 function Is_Defaulted
(Param
: Entity_Id
) return Boolean is
6599 First
(Generic_Associations
(Parent
6600 (Associated_Formal_Package
(Actual_Pack
))));
6602 while Present
(Assoc
) loop
6603 if Nkind
(Assoc
) = N_Others_Choice
then
6606 elsif Nkind
(Assoc
) = N_Generic_Association
6607 and then Chars
(Selector_Name
(Assoc
)) = Chars
(Param
)
6609 return Box_Present
(Assoc
);
6618 --------------------------------
6619 -- Same_Instantiated_Constant --
6620 --------------------------------
6622 function Same_Instantiated_Constant
6623 (E1
, E2
: Entity_Id
) return Boolean
6629 while Present
(Ent
) loop
6633 elsif Ekind
(Ent
) /= E_Constant
then
6636 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
6637 if Entity
(Constant_Value
(Ent
)) = E1
then
6640 Ent
:= Entity
(Constant_Value
(Ent
));
6643 -- The actual may be a constant that has been folded. Recover
6646 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
6647 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
6655 end Same_Instantiated_Constant
;
6657 --------------------------------
6658 -- Same_Instantiated_Function --
6659 --------------------------------
6661 function Same_Instantiated_Function
6662 (E1
, E2
: Entity_Id
) return Boolean
6666 if Alias
(E1
) = Alias
(E2
) then
6669 elsif Present
(Alias
(E2
)) then
6670 U1
:= Original_Node
(Unit_Declaration_Node
(E1
));
6671 U2
:= Original_Node
(Unit_Declaration_Node
(Alias
(E2
)));
6673 return Nkind
(U1
) = N_Subprogram_Renaming_Declaration
6674 and then Nkind
(Name
(U1
)) = N_Attribute_Reference
6676 and then Nkind
(U2
) = N_Subprogram_Renaming_Declaration
6677 and then Nkind
(Name
(U2
)) = N_Attribute_Reference
6680 Attribute_Name
(Name
(U1
)) = Attribute_Name
(Name
(U2
));
6684 end Same_Instantiated_Function
;
6686 --------------------------------
6687 -- Same_Instantiated_Variable --
6688 --------------------------------
6690 function Same_Instantiated_Variable
6691 (E1
, E2
: Entity_Id
) return Boolean
6693 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
6694 -- Follow chain of renamings to the ultimate ancestor
6696 ---------------------
6697 -- Original_Entity --
6698 ---------------------
6700 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
6705 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
6706 and then Present
(Renamed_Object
(Orig
))
6707 and then Is_Entity_Name
(Renamed_Object
(Orig
))
6709 Orig
:= Entity
(Renamed_Object
(Orig
));
6713 end Original_Entity
;
6715 -- Start of processing for Same_Instantiated_Variable
6718 return Ekind
(E1
) = Ekind
(E2
)
6719 and then Original_Entity
(E1
) = Original_Entity
(E2
);
6720 end Same_Instantiated_Variable
;
6722 -- Start of processing for Check_Formal_Package_Instance
6726 while Present
(E1
) and then Present
(E2
) loop
6727 exit when Ekind
(E1
) = E_Package
6728 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
6730 -- If the formal is the renaming of the formal package, this
6731 -- is the end of its formal part, which may occur before the
6732 -- end of the formal part in the actual in the presence of
6733 -- defaulted parameters in the formal package.
6735 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
6736 and then Renamed_Entity
(E2
) = Scope
(E2
);
6738 -- The analysis of the actual may generate additional internal
6739 -- entities. If the formal is defaulted, there is no corresponding
6740 -- analysis and the internal entities must be skipped, until we
6741 -- find corresponding entities again.
6743 if Comes_From_Source
(E2
)
6744 and then not Comes_From_Source
(E1
)
6745 and then Chars
(E1
) /= Chars
(E2
)
6747 while Present
(E1
) and then Chars
(E1
) /= Chars
(E2
) loop
6755 -- Entities may be declared without full declaration, such as
6756 -- itypes and predefined operators (concatenation for arrays, eg).
6757 -- Skip it and keep the formal entity to find a later match for it.
6759 elsif No
(Parent
(E2
)) and then Ekind
(E1
) /= Ekind
(E2
) then
6763 -- If the formal entity comes from a formal declaration, it was
6764 -- defaulted in the formal package, and no check is needed on it.
6766 elsif Nkind
(Original_Node
(Parent
(E2
))) in
6767 N_Formal_Object_Declaration | N_Formal_Type_Declaration
6769 -- If the formal is a tagged type the corresponding class-wide
6770 -- type has been generated as well, and it must be skipped.
6772 if Is_Type
(E2
) and then Is_Tagged_Type
(E2
) then
6778 -- Ditto for defaulted formal subprograms.
6780 elsif Is_Overloadable
(E1
)
6781 and then Nkind
(Unit_Declaration_Node
(E2
)) in
6782 N_Formal_Subprogram_Declaration
6786 elsif Is_Defaulted
(E1
) then
6789 elsif Is_Type
(E1
) then
6791 -- Subtypes must statically match. E1, E2 are the local entities
6792 -- that are subtypes of the actuals. Itypes generated for other
6793 -- parameters need not be checked, the check will be performed
6794 -- on the parameters themselves.
6796 -- If E2 is a formal type declaration, it is a defaulted parameter
6797 -- and needs no checking.
6799 if not Is_Itype
(E1
) and then not Is_Itype
(E2
) then
6802 or else Etype
(E1
) /= Etype
(E2
)
6803 or else not Subtypes_Statically_Match
(E1
, E2
));
6806 elsif Ekind
(E1
) = E_Constant
then
6808 -- IN parameters must denote the same static value, or the same
6809 -- constant, or the literal null.
6811 Expr1
:= Expression
(Parent
(E1
));
6813 if Ekind
(E2
) /= E_Constant
then
6814 Check_Mismatch
(True);
6817 Expr2
:= Expression
(Parent
(E2
));
6820 if Is_OK_Static_Expression
(Expr1
) then
6821 if not Is_OK_Static_Expression
(Expr2
) then
6822 Check_Mismatch
(True);
6824 elsif Is_Discrete_Type
(Etype
(E1
)) then
6826 V1
: constant Uint
:= Expr_Value
(Expr1
);
6827 V2
: constant Uint
:= Expr_Value
(Expr2
);
6829 Check_Mismatch
(V1
/= V2
);
6832 elsif Is_Real_Type
(Etype
(E1
)) then
6834 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
6835 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
6837 Check_Mismatch
(V1
/= V2
);
6840 elsif Is_String_Type
(Etype
(E1
))
6841 and then Nkind
(Expr1
) = N_String_Literal
6843 if Nkind
(Expr2
) /= N_String_Literal
then
6844 Check_Mismatch
(True);
6847 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
6851 elsif Is_Entity_Name
(Expr1
) then
6852 if Is_Entity_Name
(Expr2
) then
6853 if Entity
(Expr1
) = Entity
(Expr2
) then
6857 (not Same_Instantiated_Constant
6858 (Entity
(Expr1
), Entity
(Expr2
)));
6862 Check_Mismatch
(True);
6865 elsif Is_Entity_Name
(Original_Node
(Expr1
))
6866 and then Is_Entity_Name
(Expr2
)
6867 and then Same_Instantiated_Constant
6868 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
6872 elsif Nkind
(Expr1
) = N_Null
then
6873 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
6876 Check_Mismatch
(True);
6879 elsif Ekind
(E1
) = E_Variable
then
6880 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
6882 elsif Ekind
(E1
) = E_Package
then
6884 (Ekind
(E1
) /= Ekind
(E2
)
6885 or else (Present
(Renamed_Entity
(E2
))
6886 and then Renamed_Entity
(E1
) /=
6887 Renamed_Entity
(E2
)));
6889 elsif Is_Overloadable
(E1
) then
6890 -- Verify that the actual subprograms match. Note that actuals
6891 -- that are attributes are rewritten as subprograms. If the
6892 -- subprogram in the formal package is defaulted, no check is
6893 -- needed. Note that this can only happen in Ada 2005 when the
6894 -- formal package can be partially parameterized.
6896 if Nkind
(Unit_Declaration_Node
(E1
)) =
6897 N_Subprogram_Renaming_Declaration
6898 and then From_Default
(Unit_Declaration_Node
(E1
))
6902 -- If the formal package has an "others" box association that
6903 -- covers this formal, there is no need for a check either.
6905 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
6906 N_Formal_Subprogram_Declaration
6907 and then Box_Present
(Unit_Declaration_Node
(E2
))
6911 -- No check needed if subprogram is a defaulted null procedure
6913 elsif No
(Alias
(E2
))
6914 and then Ekind
(E2
) = E_Procedure
6916 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
6920 -- Otherwise the actual in the formal and the actual in the
6921 -- instantiation of the formal must match, up to renamings.
6925 (Ekind
(E2
) /= Ekind
(E1
)
6926 or else not Same_Instantiated_Function
(E1
, E2
));
6930 raise Program_Error
;
6938 end Check_Formal_Package_Instance
;
6940 ---------------------------
6941 -- Check_Formal_Packages --
6942 ---------------------------
6944 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
6946 Formal_P
: Entity_Id
;
6947 Formal_Decl
: Node_Id
;
6949 -- Iterate through the declarations in the instance, looking for package
6950 -- renaming declarations that denote instances of formal packages. Stop
6951 -- when we find the renaming of the current package itself. The
6952 -- declaration for a formal package without a box is followed by an
6953 -- internal entity that repeats the instantiation.
6955 E
:= First_Entity
(P_Id
);
6956 while Present
(E
) loop
6957 if Ekind
(E
) = E_Package
then
6958 if Renamed_Entity
(E
) = P_Id
then
6961 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6965 Formal_Decl
:= Parent
(Associated_Formal_Package
(E
));
6967 -- Nothing to check if the formal has a box or an others_clause
6968 -- (necessarily with a box), or no associations altogether
6970 if Box_Present
(Formal_Decl
)
6971 or else No
(Generic_Associations
(Formal_Decl
))
6975 elsif Nkind
(First
(Generic_Associations
(Formal_Decl
))) =
6978 -- The internal validating package was generated but formal
6979 -- and instance are known to be compatible.
6981 Formal_P
:= Next_Entity
(E
);
6982 Remove
(Unit_Declaration_Node
(Formal_P
));
6985 Formal_P
:= Next_Entity
(E
);
6987 -- If the instance is within an enclosing instance body
6988 -- there is no need to verify the legality of current formal
6989 -- packages because they were legal in the generic body.
6990 -- This optimization may be applicable elsewhere, and it
6991 -- also removes spurious errors that may arise with
6992 -- on-the-fly inlining and confusion between private and
6995 if not In_Instance_Body
then
6996 Check_Formal_Package_Instance
(Formal_P
, E
);
6999 -- Restore the visibility of formals of the formal instance
7000 -- that are not defaulted, and are hidden within the current
7001 -- generic. These formals may be visible within an enclosing
7007 Elmt
:= First_Elmt
(Hidden_In_Formal_Instance
(Formal_P
));
7008 while Present
(Elmt
) loop
7009 Set_Is_Hidden
(Node
(Elmt
), False);
7014 -- After checking, remove the internal validating package.
7015 -- It is only needed for semantic checks, and as it may
7016 -- contain generic formal declarations it should not reach
7019 Remove
(Unit_Declaration_Node
(Formal_P
));
7026 end Check_Formal_Packages
;
7028 ---------------------------------
7029 -- Check_Forward_Instantiation --
7030 ---------------------------------
7032 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
7034 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
7037 -- The instantiation appears before the generic body if we are in the
7038 -- scope of the unit containing the generic, either in its spec or in
7039 -- the package body, and before the generic body.
7041 if Ekind
(Gen_Comp
) = E_Package_Body
then
7042 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
7045 if In_Open_Scopes
(Gen_Comp
)
7046 and then No
(Corresponding_Body
(Decl
))
7051 and then not Is_Compilation_Unit
(S
)
7052 and then not Is_Child_Unit
(S
)
7054 if Ekind
(S
) = E_Package
then
7055 Set_Has_Forward_Instantiation
(S
);
7061 end Check_Forward_Instantiation
;
7063 ---------------------------
7064 -- Check_Generic_Actuals --
7065 ---------------------------
7067 -- The visibility of the actuals may be different between the point of
7068 -- generic instantiation and the instantiation of the body.
7070 procedure Check_Generic_Actuals
7071 (Instance
: Entity_Id
;
7072 Is_Formal_Box
: Boolean)
7078 E
:= First_Entity
(Instance
);
7079 while Present
(E
) loop
7081 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
7082 and then Scope
(Etype
(E
)) /= Instance
7083 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
7085 -- Restore the proper view of the actual from the information
7086 -- saved earlier by Instantiate_Type.
7088 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
7090 -- If the actual is itself the formal of a parent instance,
7091 -- then also restore the proper view of its actual and so on.
7092 -- That's necessary for nested instantiations of the form
7095 -- type Component is private;
7096 -- type Array_Type is array (Positive range <>) of Component;
7099 -- when the outermost actuals have inconsistent views, because
7100 -- the Component_Type of Array_Type of the inner instantiations
7101 -- is the actual of Component of the outermost one and not that
7102 -- of the corresponding inner instantiations.
7104 Astype
:= Ancestor_Subtype
(E
);
7105 while Present
(Astype
)
7106 and then Nkind
(Parent
(Astype
)) = N_Subtype_Declaration
7107 and then Present
(Generic_Parent_Type
(Parent
(Astype
)))
7108 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Astype
)))
7110 Check_Private_View
(Subtype_Indication
(Parent
(Astype
)));
7111 Astype
:= Ancestor_Subtype
(Astype
);
7114 Set_Is_Generic_Actual_Type
(E
);
7116 if Is_Private_Type
(E
) and then Present
(Full_View
(E
)) then
7117 Set_Is_Generic_Actual_Type
(Full_View
(E
));
7120 Set_Is_Hidden
(E
, False);
7121 Set_Is_Potentially_Use_Visible
(E
, In_Use
(Instance
));
7123 -- We constructed the generic actual type as a subtype of the
7124 -- supplied type. This means that it normally would not inherit
7125 -- subtype specific attributes of the actual, which is wrong for
7126 -- the generic case.
7128 Astype
:= Ancestor_Subtype
(E
);
7132 -- This can happen when E is an itype that is the full view of
7133 -- a private type completed, e.g. with a constrained array. In
7134 -- that case, use the first subtype, which will carry size
7135 -- information. The base type itself is unconstrained and will
7138 Astype
:= First_Subtype
(E
);
7141 Set_Size_Info
(E
, (Astype
));
7142 Copy_RM_Size
(To
=> E
, From
=> Astype
);
7143 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
7145 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
7146 Set_RM_Size
(E
, RM_Size
(Astype
));
7149 elsif Ekind
(E
) = E_Package
then
7151 -- If this is the renaming for the current instance, we're done.
7152 -- Otherwise it is a formal package. If the corresponding formal
7153 -- was declared with a box, the (instantiations of the) generic
7154 -- formal part are also visible. Otherwise, ignore the entity
7155 -- created to validate the actuals.
7157 if Renamed_Entity
(E
) = Instance
then
7160 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
7163 -- The visibility of a formal of an enclosing generic is already
7166 elsif Denotes_Formal_Package
(E
) then
7169 elsif Present
(Associated_Formal_Package
(E
))
7170 and then not Is_Generic_Formal
(E
)
7172 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
7173 Check_Generic_Actuals
(Renamed_Entity
(E
), True);
7176 Check_Generic_Actuals
(Renamed_Entity
(E
), False);
7179 Set_Is_Hidden
(E
, False);
7182 -- If this is a subprogram instance (in a wrapper package) the
7183 -- actual is fully visible.
7185 elsif Is_Wrapper_Package
(Instance
) then
7186 Set_Is_Hidden
(E
, False);
7188 -- If the formal package is declared with a box, or if the formal
7189 -- parameter is defaulted, it is visible in the body.
7191 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
7192 Set_Is_Hidden
(E
, False);
7195 if Ekind
(E
) = E_Constant
then
7197 -- If the type of the actual is a private type declared in the
7198 -- enclosing scope of the generic unit, the body of the generic
7199 -- sees the full view of the type (because it has to appear in
7200 -- the corresponding package body). If the type is private now,
7201 -- exchange views to restore the proper visiblity in the instance.
7204 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
7205 -- The type of the actual
7210 Parent_Scope
: Entity_Id
;
7211 -- The enclosing scope of the generic unit
7214 if Is_Wrapper_Package
(Instance
) then
7218 (Unit_Declaration_Node
7219 (Related_Instance
(Instance
))));
7222 Generic_Parent
(Package_Specification
(Instance
));
7225 Parent_Scope
:= Scope
(Gen_Id
);
7227 -- The exchange is only needed if the generic is defined
7228 -- within a package which is not a common ancestor of the
7229 -- scope of the instance, and is not already in scope.
7231 if Is_Private_Type
(Typ
)
7232 and then Scope
(Typ
) = Parent_Scope
7233 and then Scope
(Instance
) /= Parent_Scope
7234 and then Ekind
(Parent_Scope
) = E_Package
7235 and then not Is_Child_Unit
(Gen_Id
)
7239 -- If the type of the entity is a subtype, it may also have
7240 -- to be made visible, together with the base type of its
7241 -- full view, after exchange.
7243 if Is_Private_Type
(Etype
(E
)) then
7244 Switch_View
(Etype
(E
));
7245 Switch_View
(Base_Type
(Etype
(E
)));
7253 end Check_Generic_Actuals
;
7255 ------------------------------
7256 -- Check_Generic_Child_Unit --
7257 ------------------------------
7259 procedure Check_Generic_Child_Unit
7261 Parent_Installed
: in out Boolean)
7263 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
7264 Gen_Par
: Entity_Id
:= Empty
;
7266 Inst_Par
: Entity_Id
;
7269 function Find_Generic_Child
7271 Id
: Node_Id
) return Entity_Id
;
7272 -- Search generic parent for possible child unit with the given name
7274 function In_Enclosing_Instance
return Boolean;
7275 -- Within an instance of the parent, the child unit may be denoted by
7276 -- a simple name, or an abbreviated expanded name. Examine enclosing
7277 -- scopes to locate a possible parent instantiation.
7279 ------------------------
7280 -- Find_Generic_Child --
7281 ------------------------
7283 function Find_Generic_Child
7285 Id
: Node_Id
) return Entity_Id
7290 -- If entity of name is already set, instance has already been
7291 -- resolved, e.g. in an enclosing instantiation.
7293 if Present
(Entity
(Id
)) then
7294 if Scope
(Entity
(Id
)) = Scop
then
7301 E
:= First_Entity
(Scop
);
7302 while Present
(E
) loop
7303 if Chars
(E
) = Chars
(Id
)
7304 and then Is_Child_Unit
(E
)
7306 if Is_Child_Unit
(E
)
7307 and then not Is_Visible_Lib_Unit
(E
)
7310 ("generic child unit& is not visible", Gen_Id
, E
);
7322 end Find_Generic_Child
;
7324 ---------------------------
7325 -- In_Enclosing_Instance --
7326 ---------------------------
7328 function In_Enclosing_Instance
return Boolean is
7329 Enclosing_Instance
: Node_Id
;
7330 Instance_Decl
: Node_Id
;
7333 -- We do not inline any call that contains instantiations, except
7334 -- for instantiations of Unchecked_Conversion, so if we are within
7335 -- an inlined body the current instance does not require parents.
7337 if In_Inlined_Body
then
7338 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
7342 -- Loop to check enclosing scopes
7344 Enclosing_Instance
:= Current_Scope
;
7345 while Present
(Enclosing_Instance
) loop
7346 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
7348 if Ekind
(Enclosing_Instance
) = E_Package
7349 and then Is_Generic_Instance
(Enclosing_Instance
)
7351 (Generic_Parent
(Specification
(Instance_Decl
)))
7353 -- Check whether the generic we are looking for is a child of
7356 E
:= Find_Generic_Child
7357 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
7358 exit when Present
(E
);
7364 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
7376 Make_Expanded_Name
(Loc
,
7378 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
7379 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
7381 Set_Entity
(Gen_Id
, E
);
7382 Set_Etype
(Gen_Id
, Etype
(E
));
7383 Parent_Installed
:= False; -- Already in scope.
7386 end In_Enclosing_Instance
;
7388 -- Start of processing for Check_Generic_Child_Unit
7391 -- If the name of the generic is given by a selected component, it may
7392 -- be the name of a generic child unit, and the prefix is the name of an
7393 -- instance of the parent, in which case the child unit must be visible.
7394 -- If this instance is not in scope, it must be placed there and removed
7395 -- after instantiation, because what is being instantiated is not the
7396 -- original child, but the corresponding child present in the instance
7399 -- If the child is instantiated within the parent, it can be given by
7400 -- a simple name. In this case the instance is already in scope, but
7401 -- the child generic must be recovered from the generic parent as well.
7403 if Nkind
(Gen_Id
) = N_Selected_Component
then
7404 S
:= Selector_Name
(Gen_Id
);
7405 Analyze
(Prefix
(Gen_Id
));
7406 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7408 if Ekind
(Inst_Par
) = E_Package
7409 and then Present
(Renamed_Entity
(Inst_Par
))
7411 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7414 if Ekind
(Inst_Par
) = E_Package
then
7415 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
7416 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
7418 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
7420 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
7422 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
7425 elsif Ekind
(Inst_Par
) = E_Generic_Package
7426 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
7428 -- A formal package may be a real child package, and not the
7429 -- implicit instance within a parent. In this case the child is
7430 -- not visible and has to be retrieved explicitly as well.
7432 Gen_Par
:= Inst_Par
;
7435 if Present
(Gen_Par
) then
7437 -- The prefix denotes an instantiation. The entity itself may be a
7438 -- nested generic, or a child unit.
7440 E
:= Find_Generic_Child
(Gen_Par
, S
);
7443 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
7444 Set_Entity
(Gen_Id
, E
);
7445 Set_Etype
(Gen_Id
, Etype
(E
));
7447 Set_Etype
(S
, Etype
(E
));
7449 -- Indicate that this is a reference to the parent
7451 if In_Extended_Main_Source_Unit
(Gen_Id
) then
7452 Set_Is_Instantiated
(Inst_Par
);
7455 -- A common mistake is to replicate the naming scheme of a
7456 -- hierarchy by instantiating a generic child directly, rather
7457 -- than the implicit child in a parent instance:
7459 -- generic .. package Gpar is ..
7460 -- generic .. package Gpar.Child is ..
7461 -- package Par is new Gpar ();
7464 -- package Par.Child is new Gpar.Child ();
7465 -- rather than Par.Child
7467 -- In this case the instantiation is within Par, which is an
7468 -- instance, but Gpar does not denote Par because we are not IN
7469 -- the instance of Gpar, so this is illegal. The test below
7470 -- recognizes this particular case.
7472 if Is_Child_Unit
(E
)
7473 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
7474 and then (not In_Instance
7475 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
7479 ("prefix of generic child unit must be instance of parent",
7483 if not In_Open_Scopes
(Inst_Par
)
7484 and then Nkind
(Parent
(Gen_Id
)) not in
7485 N_Generic_Renaming_Declaration
7487 Install_Parent
(Inst_Par
);
7488 Parent_Installed
:= True;
7490 elsif In_Open_Scopes
(Inst_Par
) then
7492 -- If the parent is already installed, install the actuals
7493 -- for its formal packages. This is necessary when the child
7494 -- instance is a child of the parent instance: in this case,
7495 -- the parent is placed on the scope stack but the formal
7496 -- packages are not made visible.
7498 Install_Formal_Packages
(Inst_Par
);
7502 -- If the generic parent does not contain an entity that
7503 -- corresponds to the selector, the instance doesn't either.
7504 -- Analyzing the node will yield the appropriate error message.
7505 -- If the entity is not a child unit, then it is an inner
7506 -- generic in the parent.
7514 if Is_Child_Unit
(Entity
(Gen_Id
))
7516 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7517 and then not In_Open_Scopes
(Inst_Par
)
7519 Install_Parent
(Inst_Par
);
7520 Parent_Installed
:= True;
7522 -- The generic unit may be the renaming of the implicit child
7523 -- present in an instance. In that case the parent instance is
7524 -- obtained from the name of the renamed entity.
7526 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
7527 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7528 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7531 Renamed_Package
: constant Node_Id
:=
7532 Name
(Parent
(Entity
(Gen_Id
)));
7534 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
7535 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
7536 Install_Parent
(Inst_Par
);
7537 Parent_Installed
:= True;
7543 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
7545 -- Entity already present, analyze prefix, whose meaning may be an
7546 -- instance in the current context. If it is an instance of a
7547 -- relative within another, the proper parent may still have to be
7548 -- installed, if they are not of the same generation.
7550 Analyze
(Prefix
(Gen_Id
));
7552 -- Prevent cascaded errors
7554 if Etype
(Prefix
(Gen_Id
)) = Any_Type
then
7558 -- In the unlikely case that a local declaration hides the name of
7559 -- the parent package, locate it on the homonym chain. If the context
7560 -- is an instance of the parent, the renaming entity is flagged as
7563 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7564 while Present
(Inst_Par
)
7565 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
7567 Inst_Par
:= Homonym
(Inst_Par
);
7570 pragma Assert
(Present
(Inst_Par
));
7571 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
7573 if In_Enclosing_Instance
then
7576 elsif Present
(Entity
(Gen_Id
))
7577 and then No
(Renamed_Entity
(Entity
(Gen_Id
)))
7578 and then Is_Child_Unit
(Entity
(Gen_Id
))
7579 and then not In_Open_Scopes
(Inst_Par
)
7581 Install_Parent
(Inst_Par
);
7582 Parent_Installed
:= True;
7584 -- Handle renaming of generic child unit
7586 elsif Present
(Entity
(Gen_Id
))
7587 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7588 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7595 -- The entity of the renamed generic child unit does not
7596 -- have any reference to the instantiated parent. In order to
7597 -- locate it we traverse the scope containing the renaming
7598 -- declaration; the instance of the parent is available in
7599 -- the prefix of the renaming declaration. For example:
7602 -- package Inst_Par is new ...
7603 -- generic package Ren_Child renames Ins_Par.Child;
7608 -- package Inst_Child is new A.Ren_Child;
7611 E
:= First_Entity
(Entity
(Prefix
(Gen_Id
)));
7612 while Present
(E
) loop
7613 if not Is_Object
(E
)
7614 and then Present
(Renamed_Entity
(E
))
7616 Renamed_Entity
(E
) = Renamed_Entity
(Entity
(Gen_Id
))
7618 Ren_Decl
:= Parent
(E
);
7619 Inst_Par
:= Entity
(Prefix
(Name
(Ren_Decl
)));
7621 if not In_Open_Scopes
(Inst_Par
) then
7622 Install_Parent
(Inst_Par
);
7623 Parent_Installed
:= True;
7629 E
:= Next_Entity
(E
);
7634 elsif In_Enclosing_Instance
then
7636 -- The child unit is found in some enclosing scope
7643 -- If this is the renaming of the implicit child in a parent
7644 -- instance, recover the parent name and install it.
7646 if Is_Entity_Name
(Gen_Id
) then
7647 E
:= Entity
(Gen_Id
);
7649 if Is_Generic_Unit
(E
)
7650 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
7651 and then Is_Child_Unit
(Renamed_Entity
(E
))
7652 and then Is_Generic_Unit
(Scope
(Renamed_Entity
(E
)))
7653 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
7655 Rewrite
(Gen_Id
, New_Copy_Tree
(Name
(Parent
(E
))));
7656 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7658 if not In_Open_Scopes
(Inst_Par
) then
7659 Install_Parent
(Inst_Par
);
7660 Parent_Installed
:= True;
7663 -- If it is a child unit of a non-generic parent, it may be
7664 -- use-visible and given by a direct name. Install parent as
7667 elsif Is_Generic_Unit
(E
)
7668 and then Is_Child_Unit
(E
)
7670 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7671 and then not Is_Generic_Unit
(Scope
(E
))
7673 if not In_Open_Scopes
(Scope
(E
)) then
7674 Install_Parent
(Scope
(E
));
7675 Parent_Installed
:= True;
7680 end Check_Generic_Child_Unit
;
7682 -----------------------------
7683 -- Check_Hidden_Child_Unit --
7684 -----------------------------
7686 procedure Check_Hidden_Child_Unit
7688 Gen_Unit
: Entity_Id
;
7689 Act_Decl_Id
: Entity_Id
)
7691 Gen_Id
: constant Node_Id
:= Name
(N
);
7694 if Is_Child_Unit
(Gen_Unit
)
7695 and then Is_Child_Unit
(Act_Decl_Id
)
7696 and then Nkind
(Gen_Id
) = N_Expanded_Name
7697 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
7698 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
7700 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
7702 ("generic unit & is implicitly declared in &",
7703 Defining_Unit_Name
(N
), Gen_Unit
);
7704 Error_Msg_N
("\instance must have different name",
7705 Defining_Unit_Name
(N
));
7707 end Check_Hidden_Child_Unit
;
7709 ------------------------
7710 -- Check_Private_View --
7711 ------------------------
7713 procedure Check_Private_View
(N
: Node_Id
) is
7714 T
: constant Entity_Id
:= Etype
(N
);
7718 -- Exchange views if the type was not private in the generic but is
7719 -- private at the point of instantiation. Do not exchange views if
7720 -- the scope of the type is in scope. This can happen if both generic
7721 -- and instance are sibling units, or if type is defined in a parent.
7722 -- In this case the visibility of the type will be correct for all
7726 BT
:= Base_Type
(T
);
7728 if Is_Private_Type
(T
)
7729 and then not Has_Private_View
(N
)
7730 and then Present
(Full_View
(T
))
7731 and then not In_Open_Scopes
(Scope
(T
))
7733 -- In the generic, the full declaration was visible
7737 elsif Has_Private_View
(N
)
7738 and then not Is_Private_Type
(T
)
7739 and then not Has_Been_Exchanged
(T
)
7740 and then (not In_Open_Scopes
(Scope
(T
))
7741 or else Nkind
(Parent
(N
)) = N_Subtype_Declaration
)
7743 -- In the generic, only the private declaration was visible
7745 -- If the type appears in a subtype declaration, the subtype in
7746 -- instance must have a view compatible with that of its parent,
7747 -- which must be exchanged (see corresponding code in Restore_
7748 -- Private_Views) so we make an exception to the open scope rule.
7750 Prepend_Elmt
(T
, Exchanged_Views
);
7751 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
7753 -- Finally, a non-private subtype may have a private base type, which
7754 -- must be exchanged for consistency. This can happen when a package
7755 -- body is instantiated, when the scope stack is empty but in fact
7756 -- the subtype and the base type are declared in an enclosing scope.
7758 -- Note that in this case we introduce an inconsistency in the view
7759 -- set, because we switch the base type BT, but there could be some
7760 -- private dependent subtypes of BT which remain unswitched. Such
7761 -- subtypes might need to be switched at a later point (see specific
7762 -- provision for that case in Switch_View).
7764 elsif not Is_Private_Type
(T
)
7765 and then not Has_Private_View
(N
)
7766 and then Is_Private_Type
(BT
)
7767 and then Present
(Full_View
(BT
))
7768 and then not Is_Generic_Type
(BT
)
7769 and then not In_Open_Scopes
(BT
)
7771 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
7772 Exchange_Declarations
(BT
);
7775 end Check_Private_View
;
7777 -----------------------------
7778 -- Check_Hidden_Primitives --
7779 -----------------------------
7781 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
7784 Result
: Elist_Id
:= No_Elist
;
7787 if No
(Assoc_List
) then
7791 -- Traverse the list of associations between formals and actuals
7792 -- searching for renamings of tagged types
7794 Actual
:= First
(Assoc_List
);
7795 while Present
(Actual
) loop
7796 if Nkind
(Actual
) = N_Subtype_Declaration
then
7797 Gen_T
:= Generic_Parent_Type
(Actual
);
7799 if Present
(Gen_T
) and then Is_Tagged_Type
(Gen_T
) then
7801 -- Traverse the list of primitives of the actual types
7802 -- searching for hidden primitives that are visible in the
7803 -- corresponding generic formal; leave them visible and
7804 -- append them to Result to restore their decoration later.
7806 Install_Hidden_Primitives
7807 (Prims_List
=> Result
,
7809 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
7817 end Check_Hidden_Primitives
;
7819 --------------------------
7820 -- Contains_Instance_Of --
7821 --------------------------
7823 function Contains_Instance_Of
7826 N
: Node_Id
) return Boolean
7834 -- Verify that there are no circular instantiations. We check whether
7835 -- the unit contains an instance of the current scope or some enclosing
7836 -- scope (in case one of the instances appears in a subunit). Longer
7837 -- circularities involving subunits might seem too pathological to
7838 -- consider, but they were not too pathological for the authors of
7839 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7840 -- enclosing generic scopes as containing an instance.
7843 -- Within a generic subprogram body, the scope is not generic, to
7844 -- allow for recursive subprograms. Use the declaration to determine
7845 -- whether this is a generic unit.
7847 if Ekind
(Scop
) = E_Generic_Package
7848 or else (Is_Subprogram
(Scop
)
7849 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
7850 N_Generic_Subprogram_Declaration
)
7852 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
7854 while Present
(Elmt
) loop
7855 if Node
(Elmt
) = Scop
then
7856 Error_Msg_Node_2
:= Inner
;
7858 ("circular instantiation: & instantiated within &!",
7862 elsif Node
(Elmt
) = Inner
then
7865 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
7866 Error_Msg_Node_2
:= Inner
;
7868 ("circular instantiation: & instantiated within &!",
7876 -- Indicate that Inner is being instantiated within Scop
7878 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
7881 if Scop
= Standard_Standard
then
7884 Scop
:= Scope
(Scop
);
7889 end Contains_Instance_Of
;
7891 -----------------------
7892 -- Copy_Generic_Node --
7893 -----------------------
7895 function Copy_Generic_Node
7897 Parent_Id
: Node_Id
;
7898 Instantiating
: Boolean) return Node_Id
7903 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
7904 -- Check the given value of one of the Fields referenced by the current
7905 -- node to determine whether to copy it recursively. The field may hold
7906 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
7907 -- Char) in which case it need not be copied.
7909 procedure Copy_Descendants
;
7910 -- Common utility for various nodes
7912 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
7913 -- Make copy of element list
7915 function Copy_Generic_List
7917 Parent_Id
: Node_Id
) return List_Id
;
7918 -- Apply Copy_Node recursively to the members of a node list
7920 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
7921 -- True if an identifier is part of the defining program unit name of
7923 -- Consider removing this subprogram now that ASIS no longer uses it.
7925 ----------------------
7926 -- Copy_Descendants --
7927 ----------------------
7929 procedure Copy_Descendants
is
7930 procedure Walk
is new
7931 Walk_Sinfo_Fields_Pairwise
(Copy_Generic_Descendant
);
7934 end Copy_Descendants
;
7936 -----------------------------
7937 -- Copy_Generic_Descendant --
7938 -----------------------------
7940 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
7942 if D
= Union_Id
(Empty
) then
7945 elsif D
in Node_Range
then
7947 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
7949 elsif D
in List_Range
then
7950 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
7952 elsif D
in Elist_Range
then
7953 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
7955 -- Nothing else is copyable (e.g. Uint values), return as is
7960 end Copy_Generic_Descendant
;
7962 ------------------------
7963 -- Copy_Generic_Elist --
7964 ------------------------
7966 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
7973 M
:= First_Elmt
(E
);
7974 while Present
(M
) loop
7976 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
7985 end Copy_Generic_Elist
;
7987 -----------------------
7988 -- Copy_Generic_List --
7989 -----------------------
7991 function Copy_Generic_List
7993 Parent_Id
: Node_Id
) return List_Id
8001 Set_Parent
(New_L
, Parent_Id
);
8004 while Present
(N
) loop
8005 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
8014 end Copy_Generic_List
;
8016 ---------------------------
8017 -- In_Defining_Unit_Name --
8018 ---------------------------
8020 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
8023 Present
(Parent
(Nam
))
8024 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
8026 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
8027 and then In_Defining_Unit_Name
(Parent
(Nam
))));
8028 end In_Defining_Unit_Name
;
8030 -- Start of processing for Copy_Generic_Node
8037 New_N
:= New_Copy
(N
);
8039 -- Copy aspects if present
8041 if Has_Aspects
(N
) then
8042 Set_Has_Aspects
(New_N
, False);
8043 Set_Aspect_Specifications
8044 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
8047 -- If we are instantiating, we want to adjust the sloc based on the
8048 -- current S_Adjustment. However, if this is the root node of a subunit,
8049 -- we need to defer that adjustment to below (see "elsif Instantiating
8050 -- and Was_Stub"), so it comes after Create_Instantiation_Source has
8051 -- computed the adjustment.
8054 and then not (Nkind
(N
) in N_Proper_Body
8055 and then Was_Originally_Stub
(N
))
8057 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8060 if not Is_List_Member
(N
) then
8061 Set_Parent
(New_N
, Parent_Id
);
8064 -- Special casing for identifiers and other entity names and operators
8066 if Nkind
(New_N
) in N_Character_Literal
8072 if not Instantiating
then
8074 -- Link both nodes in order to assign subsequently the entity of
8075 -- the copy to the original node, in case this is a global
8078 Set_Associated_Node
(N
, New_N
);
8080 -- If we are within an instantiation, this is a nested generic
8081 -- that has already been analyzed at the point of definition.
8082 -- We must preserve references that were global to the enclosing
8083 -- parent at that point. Other occurrences, whether global or
8084 -- local to the current generic, must be resolved anew, so we
8085 -- reset the entity in the generic copy. A global reference has a
8086 -- smaller depth than the parent, or else the same depth in case
8087 -- both are distinct compilation units.
8089 -- A child unit is implicitly declared within the enclosing parent
8090 -- but is in fact global to it, and must be preserved.
8092 -- It is also possible for Current_Instantiated_Parent to be
8093 -- defined, and for this not to be a nested generic, namely if
8094 -- the unit is loaded through Rtsfind. In that case, the entity of
8095 -- New_N is only a link to the associated node, and not a defining
8098 -- The entities for parent units in the defining_program_unit of a
8099 -- generic child unit are established when the context of the unit
8100 -- is first analyzed, before the generic copy is made. They are
8101 -- preserved in the copy for use in e.g. ASIS queries.
8103 Ent
:= Entity
(New_N
);
8105 if No
(Current_Instantiated_Parent
.Gen_Id
) then
8107 or else Nkind
(Ent
) /= N_Defining_Identifier
8108 or else not In_Defining_Unit_Name
(N
)
8110 Set_Associated_Node
(New_N
, Empty
);
8114 or else Nkind
(Ent
) not in N_Entity
8115 or else No
(Scope
(Ent
))
8117 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
8118 and then not Is_Child_Unit
(Ent
))
8120 (Scope_Depth_Set
(Scope
(Ent
))
8122 Scope_Depth
(Scope
(Ent
)) >
8123 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
8125 Get_Source_Unit
(Ent
) =
8126 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
8128 Set_Associated_Node
(New_N
, Empty
);
8131 -- Case of instantiating identifier or some other name or operator
8134 -- If the associated node is still defined, the entity in it
8135 -- is global, and must be copied to the instance. If this copy
8136 -- is being made for a body to inline, it is applied to an
8137 -- instantiated tree, and the entity is already present and
8138 -- must be also preserved.
8141 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
8144 if Present
(Assoc
) then
8145 if Nkind
(Assoc
) = Nkind
(N
) then
8146 Set_Entity
(New_N
, Entity
(Assoc
));
8147 Check_Private_View
(N
);
8149 -- Here we deal with a very peculiar case for which the
8150 -- Has_Private_View mechanism is not sufficient, because
8151 -- the reference to the type is implicit in the tree,
8152 -- that is to say, it's not referenced from a node but
8153 -- only from another type, namely through Component_Type.
8157 -- type Pt is private;
8160 -- type Ft is array (Positive range <>) of Pt;
8162 -- procedure Check (F1, F2 : Ft; Lt : Boolean);
8166 -- type Pt is new Boolean;
8169 -- package body P is
8170 -- package body G is
8171 -- procedure Check (F1, F2 : Ft; Lt : Boolean) is
8173 -- if (F1 < F2) /= Lt then
8180 -- type Arr is array (Positive range <>) of P.Pt;
8182 -- package Inst is new P.G (Arr);
8184 -- Pt is a global type for the generic package G and it
8185 -- is not referenced in its body, but only as component
8186 -- type of Ft, which is a local type. This means that no
8187 -- references to Pt or Ft are seen during the copy of the
8188 -- body, the only reference to Pt being seen is when the
8189 -- actuals are checked by Check_Generic_Actuals, but Pt
8190 -- is still private at this point. In the end, the views
8191 -- of Pt are not switched in the body and, therefore, the
8192 -- array comparison is rejected because the component is
8195 -- Adding e.g. a dummy variable of type Pt in the body is
8196 -- sufficient to make everything work, so we generate an
8197 -- artificial reference to Pt on the fly and thus force
8198 -- the switching of views on the grounds that, if the
8199 -- comparison was accepted during the semantic analysis
8200 -- of the generic, this means that the component cannot
8201 -- have been private (see Sem_Type.Valid_Comparison_Arg).
8203 if Nkind
(Assoc
) in N_Op_Compare
8204 and then Present
(Etype
(Left_Opnd
(Assoc
)))
8205 and then Is_Array_Type
(Etype
(Left_Opnd
(Assoc
)))
8206 and then Present
(Etype
(Right_Opnd
(Assoc
)))
8207 and then Is_Array_Type
(Etype
(Right_Opnd
(Assoc
)))
8210 Ltyp
: constant Entity_Id
:=
8211 Etype
(Left_Opnd
(Assoc
));
8212 Rtyp
: constant Entity_Id
:=
8213 Etype
(Right_Opnd
(Assoc
));
8215 if Is_Private_Type
(Component_Type
(Ltyp
)) then
8217 (New_Occurrence_Of
(Component_Type
(Ltyp
),
8220 if Is_Private_Type
(Component_Type
(Rtyp
)) then
8222 (New_Occurrence_Of
(Component_Type
(Rtyp
),
8227 -- Here is a similar case, for the Designated_Type of an
8228 -- access type that is present as target type in a type
8229 -- conversion from another access type. In this case, if
8230 -- the base types of the designated types are different
8231 -- and the conversion was accepted during the semantic
8232 -- analysis of the generic, this means that the target
8233 -- type cannot have been private (see Valid_Conversion).
8235 elsif Nkind
(Assoc
) = N_Identifier
8236 and then Nkind
(Parent
(Assoc
)) = N_Type_Conversion
8237 and then Subtype_Mark
(Parent
(Assoc
)) = Assoc
8238 and then Present
(Etype
(Assoc
))
8239 and then Is_Access_Type
(Etype
(Assoc
))
8240 and then Present
(Etype
(Expression
(Parent
(Assoc
))))
8242 Is_Access_Type
(Etype
(Expression
(Parent
(Assoc
))))
8245 Targ_Desig
: constant Entity_Id
:=
8246 Designated_Type
(Etype
(Assoc
));
8247 Expr_Desig
: constant Entity_Id
:=
8249 (Etype
(Expression
(Parent
(Assoc
))));
8251 if Base_Type
(Targ_Desig
) /= Base_Type
(Expr_Desig
)
8252 and then Is_Private_Type
(Targ_Desig
)
8255 (New_Occurrence_Of
(Targ_Desig
, Sloc
(N
)));
8260 -- The node is a reference to a global type and acts as the
8261 -- subtype mark of a qualified expression created in order
8262 -- to aid resolution of accidental overloading in instances.
8263 -- Since N is a reference to a type, the Associated_Node of
8264 -- N denotes an entity rather than another identifier. See
8265 -- Qualify_Universal_Operands for details.
8267 elsif Nkind
(N
) = N_Identifier
8268 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
8269 and then Subtype_Mark
(Parent
(N
)) = N
8270 and then Is_Qualified_Universal_Literal
(Parent
(N
))
8272 Set_Entity
(New_N
, Assoc
);
8274 -- The name in the call may be a selected component if the
8275 -- call has not been analyzed yet, as may be the case for
8276 -- pre/post conditions in a generic unit.
8278 elsif Nkind
(Assoc
) = N_Function_Call
8279 and then Is_Entity_Name
(Name
(Assoc
))
8281 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
8283 elsif Nkind
(Assoc
) in N_Entity
8284 and then Expander_Active
8286 -- Inlining case: we are copying a tree that contains
8287 -- global entities, which are preserved in the copy to be
8288 -- used for subsequent inlining.
8293 Set_Entity
(New_N
, Empty
);
8299 -- For expanded name, we must copy the Prefix and Selector_Name
8301 if Nkind
(N
) = N_Expanded_Name
then
8303 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
8305 Set_Selector_Name
(New_N
,
8306 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
8308 -- For operators, copy the operands
8310 elsif Nkind
(N
) in N_Op
then
8311 if Nkind
(N
) in N_Binary_Op
then
8312 Set_Left_Opnd
(New_N
,
8313 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
8316 Set_Right_Opnd
(New_N
,
8317 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
8320 -- Establish a link between an entity from the generic template and the
8321 -- corresponding entity in the generic copy to be analyzed.
8323 elsif Nkind
(N
) in N_Entity
then
8324 if not Instantiating
then
8325 Set_Associated_Entity
(N
, New_N
);
8328 -- Clear any existing link the copy may inherit from the replicated
8329 -- generic template entity.
8331 Set_Associated_Entity
(New_N
, Empty
);
8333 -- Special casing for stubs
8335 elsif Nkind
(N
) in N_Body_Stub
then
8337 -- In any case, we must copy the specification or defining
8338 -- identifier as appropriate.
8340 if Nkind
(N
) = N_Subprogram_Body_Stub
then
8341 Set_Specification
(New_N
,
8342 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
8345 Set_Defining_Identifier
(New_N
,
8347 (Defining_Identifier
(N
), New_N
, Instantiating
));
8350 -- If we are not instantiating, then this is where we load and
8351 -- analyze subunits, i.e. at the point where the stub occurs. A
8352 -- more permissive system might defer this analysis to the point
8353 -- of instantiation, but this seems too complicated for now.
8355 if not Instantiating
then
8357 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
8359 Unum
: Unit_Number_Type
;
8363 -- Make sure that, if it is a subunit of the main unit that is
8364 -- preprocessed and if -gnateG is specified, the preprocessed
8365 -- file will be written.
8367 Lib
.Analysing_Subunit_Of_Main
:=
8368 Lib
.In_Extended_Main_Source_Unit
(N
);
8371 (Load_Name
=> Subunit_Name
,
8375 Lib
.Analysing_Subunit_Of_Main
:= False;
8377 -- If the proper body is not found, a warning message will be
8378 -- emitted when analyzing the stub, or later at the point of
8379 -- instantiation. Here we just leave the stub as is.
8381 if Unum
= No_Unit
then
8382 Subunits_Missing
:= True;
8383 goto Subunit_Not_Found
;
8386 Subunit
:= Cunit
(Unum
);
8388 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
8390 ("found child unit instead of expected SEPARATE subunit",
8392 Error_Msg_Sloc
:= Sloc
(N
);
8393 Error_Msg_N
("\to complete stub #", Subunit
);
8394 goto Subunit_Not_Found
;
8397 -- We must create a generic copy of the subunit, in order to
8398 -- perform semantic analysis on it, and we must replace the
8399 -- stub in the original generic unit with the subunit, in order
8400 -- to preserve non-local references within.
8402 -- Only the proper body needs to be copied. Library_Unit and
8403 -- context clause are simply inherited by the generic copy.
8404 -- Note that the copy (which may be recursive if there are
8405 -- nested subunits) must be done first, before attaching it to
8406 -- the enclosing generic.
8410 (Proper_Body
(Unit
(Subunit
)),
8411 Empty
, Instantiating
=> False);
8413 -- Now place the original proper body in the original generic
8414 -- unit. This is a body, not a compilation unit.
8416 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
8417 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
8418 Set_Was_Originally_Stub
(N
);
8420 -- Finally replace the body of the subunit with its copy, and
8421 -- make this new subunit into the library unit of the generic
8422 -- copy, which does not have stubs any longer.
8424 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
8425 Set_Library_Unit
(New_N
, Subunit
);
8426 Inherit_Context
(Unit
(Subunit
), N
);
8429 -- If we are instantiating, this must be an error case, since
8430 -- otherwise we would have replaced the stub node by the proper body
8431 -- that corresponds. So just ignore it in the copy (i.e. we have
8432 -- copied it, and that is good enough).
8438 <<Subunit_Not_Found
>> null;
8440 -- If the node is a compilation unit, it is the subunit of a stub, which
8441 -- has been loaded already (see code below). In this case, the library
8442 -- unit field of N points to the parent unit (which is a compilation
8443 -- unit) and need not (and cannot) be copied.
8445 -- When the proper body of the stub is analyzed, the library_unit link
8446 -- is used to establish the proper context (see sem_ch10).
8448 -- The other fields of a compilation unit are copied as usual
8450 elsif Nkind
(N
) = N_Compilation_Unit
then
8452 -- This code can only be executed when not instantiating, because in
8453 -- the copy made for an instantiation, the compilation unit node has
8454 -- disappeared at the point that a stub is replaced by its proper
8457 pragma Assert
(not Instantiating
);
8459 Set_Context_Items
(New_N
,
8460 Copy_Generic_List
(Context_Items
(N
), New_N
));
8463 Copy_Generic_Node
(Unit
(N
), New_N
, Instantiating
=> False));
8465 Set_First_Inlined_Subprogram
(New_N
,
8467 (First_Inlined_Subprogram
(N
), New_N
, Instantiating
=> False));
8472 (Aux_Decls_Node
(N
), New_N
, Instantiating
=> False));
8474 -- For an assignment node, the assignment is known to be semantically
8475 -- legal if we are instantiating the template. This avoids incorrect
8476 -- diagnostics in generated code.
8478 elsif Nkind
(N
) = N_Assignment_Statement
then
8480 -- Copy name and expression fields in usual manner
8483 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
8485 Set_Expression
(New_N
,
8486 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
8488 if Instantiating
then
8489 Set_Assignment_OK
(Name
(New_N
), True);
8492 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
8493 if not Instantiating
then
8494 Set_Associated_Node
(N
, New_N
);
8497 if Present
(Get_Associated_Node
(N
))
8498 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
8500 -- In the generic the aggregate has some composite type. If at
8501 -- the point of instantiation the type has a private view,
8502 -- install the full view (and that of its ancestors, if any).
8505 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
8509 if Present
(T
) and then Is_Private_Type
(T
) then
8514 and then Is_Tagged_Type
(T
)
8515 and then Is_Derived_Type
(T
)
8517 Rt
:= Root_Type
(T
);
8522 if Is_Private_Type
(T
) then
8533 -- Do not copy the associated node, which points to the generic copy
8534 -- of the aggregate.
8536 if Nkind
(N
) = N_Aggregate
then
8537 Set_Aggregate_Bounds
8539 Node_Id
(Copy_Generic_Descendant
8540 (Union_Id
(Aggregate_Bounds
(N
)))));
8542 elsif Nkind
(N
) = N_Extension_Aggregate
then
8545 Node_Id
(Copy_Generic_Descendant
8546 (Union_Id
(Ancestor_Part
(N
)))));
8549 pragma Assert
(False);
8554 List_Id
(Copy_Generic_Descendant
(Union_Id
(Expressions
(N
)))));
8555 Set_Component_Associations
8557 List_Id
(Copy_Generic_Descendant
8558 (Union_Id
(Component_Associations
(N
)))));
8560 (New_N
, Node_Id
(Copy_Generic_Descendant
(Union_Id
(Etype
(N
)))));
8562 -- Allocators do not have an identifier denoting the access type, so we
8563 -- must locate it through the expression to check whether the views are
8566 elsif Nkind
(N
) = N_Allocator
8567 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
8568 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
8569 and then Instantiating
8572 T
: constant Node_Id
:=
8573 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
8579 -- Retrieve the allocator node in the generic copy
8581 Acc_T
:= Etype
(Parent
(Parent
(T
)));
8583 if Present
(Acc_T
) and then Is_Private_Type
(Acc_T
) then
8584 Switch_View
(Acc_T
);
8591 -- For a proper body, we must catch the case of a proper body that
8592 -- replaces a stub. This represents the point at which a separate
8593 -- compilation unit, and hence template file, may be referenced, so we
8594 -- must make a new source instantiation entry for the template of the
8595 -- subunit, and ensure that all nodes in the subunit are adjusted using
8596 -- this new source instantiation entry.
8598 elsif Nkind
(N
) in N_Proper_Body
then
8600 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
8602 if Instantiating
and then Was_Originally_Stub
(N
) then
8603 Create_Instantiation_Source
8604 (Instantiation_Node
,
8605 Defining_Entity
(N
),
8608 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8611 -- Now copy the fields of the proper body, using the new
8612 -- adjustment factor if one was needed as per test above.
8616 -- Restore the original adjustment factor
8618 S_Adjustment
:= Save_Adjustment
;
8621 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
8623 -- Do not copy Comment or Ident pragmas their content is relevant to
8624 -- the generic unit, not to the instantiating unit.
8626 if Pragma_Name_Unmapped
(N
) in Name_Comment | Name_Ident
then
8627 New_N
:= Make_Null_Statement
(Sloc
(N
));
8629 -- Do not copy pragmas generated from aspects because the pragmas do
8630 -- not carry any semantic information, plus they will be regenerated
8633 -- However, generating C we need to copy them since postconditions
8634 -- are inlined by the front end, and the front-end inlining machinery
8635 -- relies on this routine to perform inlining.
8637 elsif From_Aspect_Specification
(N
)
8638 and then not Modify_Tree_For_C
8640 New_N
:= Make_Null_Statement
(Sloc
(N
));
8646 elsif Nkind
(N
) in N_Integer_Literal | N_Real_Literal
then
8648 -- No descendant fields need traversing
8652 elsif Nkind
(N
) = N_String_Literal
8653 and then Present
(Etype
(N
))
8654 and then Instantiating
8656 -- If the string is declared in an outer scope, the string_literal
8657 -- subtype created for it may have the wrong scope. Force reanalysis
8658 -- of the constant to generate a new itype in the proper context.
8660 Set_Etype
(New_N
, Empty
);
8661 Set_Analyzed
(New_N
, False);
8663 -- For the remaining nodes, copy their descendants recursively
8668 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
8669 Set_Generic_Parent
(Specification
(New_N
), N
);
8671 -- Should preserve Corresponding_Spec??? (12.3(14))
8675 -- Propagate dimensions if present, so that they are reflected in the
8678 if Nkind
(N
) in N_Has_Etype
8679 and then (Nkind
(N
) in N_Op
or else Is_Entity_Name
(N
))
8680 and then Present
(Etype
(N
))
8681 and then Is_Floating_Point_Type
(Etype
(N
))
8682 and then Has_Dimension_System
(Etype
(N
))
8684 Copy_Dimensions
(N
, New_N
);
8688 end Copy_Generic_Node
;
8690 ----------------------------
8691 -- Denotes_Formal_Package --
8692 ----------------------------
8694 function Denotes_Formal_Package
8696 On_Exit
: Boolean := False;
8697 Instance
: Entity_Id
:= Empty
) return Boolean
8700 Scop
: constant Entity_Id
:= Scope
(Pack
);
8703 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
8704 -- The package in question may be an actual for a previous formal
8705 -- package P of the current instance, so examine its actuals as well.
8706 -- This must be recursive over other formal packages.
8708 ----------------------------------
8709 -- Is_Actual_Of_Previous_Formal --
8710 ----------------------------------
8712 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
8716 E1
:= First_Entity
(P
);
8717 while Present
(E1
) and then E1
/= Instance
loop
8718 if Ekind
(E1
) = E_Package
8719 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
8721 if Renamed_Entity
(E1
) = Pack
then
8724 elsif E1
= P
or else Renamed_Entity
(E1
) = P
then
8727 elsif Is_Actual_Of_Previous_Formal
(E1
) then
8736 end Is_Actual_Of_Previous_Formal
;
8738 -- Start of processing for Denotes_Formal_Package
8744 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
8746 Par
:= Current_Instantiated_Parent
.Act_Id
;
8749 if Ekind
(Scop
) = E_Generic_Package
8750 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
8751 N_Generic_Subprogram_Declaration
8755 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
8756 N_Formal_Package_Declaration
8764 -- Check whether this package is associated with a formal package of
8765 -- the enclosing instantiation. Iterate over the list of renamings.
8767 E
:= First_Entity
(Par
);
8768 while Present
(E
) loop
8769 if Ekind
(E
) /= E_Package
8770 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
8774 elsif Renamed_Entity
(E
) = Par
then
8777 elsif Renamed_Entity
(E
) = Pack
then
8780 elsif Is_Actual_Of_Previous_Formal
(E
) then
8790 end Denotes_Formal_Package
;
8796 procedure End_Generic
is
8798 -- ??? More things could be factored out in this routine. Should
8799 -- probably be done at a later stage.
8801 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
8802 Generic_Flags
.Decrement_Last
;
8804 Expander_Mode_Restore
;
8811 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
8812 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
8813 -- Find distance from given node to enclosing compilation unit
8819 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
8822 and then Nkind
(P
) /= N_Compilation_Unit
8824 P
:= True_Parent
(P
);
8829 -- Local declarations
8838 -- Start of processing for Earlier
8841 Find_Depth
(P1
, D1
);
8842 Find_Depth
(P2
, D2
);
8852 P1
:= True_Parent
(P1
);
8857 P2
:= True_Parent
(P2
);
8861 -- At this point P1 and P2 are at the same distance from the root.
8862 -- We examine their parents until we find a common declarative list.
8863 -- If we reach the root, N1 and N2 do not descend from the same
8864 -- declarative list (e.g. one is nested in the declarative part and
8865 -- the other is in a block in the statement part) and the earlier
8866 -- one is already frozen.
8868 while not Is_List_Member
(P1
)
8869 or else not Is_List_Member
(P2
)
8870 or else not In_Same_List
(P1
, P2
)
8872 P1
:= True_Parent
(P1
);
8873 P2
:= True_Parent
(P2
);
8875 if Nkind
(Parent
(P1
)) = N_Subunit
then
8876 P1
:= Corresponding_Stub
(Parent
(P1
));
8879 if Nkind
(Parent
(P2
)) = N_Subunit
then
8880 P2
:= Corresponding_Stub
(Parent
(P2
));
8888 -- Expanded code usually shares the source location of the original
8889 -- construct it was generated for. This however may not necessarily
8890 -- reflect the true location of the code within the tree.
8892 -- Before comparing the slocs of the two nodes, make sure that we are
8893 -- working with correct source locations. Assume that P1 is to the left
8894 -- of P2. If either one does not come from source, traverse the common
8895 -- list heading towards the other node and locate the first source
8899 -- ----+===+===+--------------+===+===+----
8900 -- expanded code expanded code
8902 if not Comes_From_Source
(P1
) then
8903 while Present
(P1
) loop
8905 -- Neither P2 nor a source statement were located during the
8906 -- search. If we reach the end of the list, then P1 does not
8907 -- occur earlier than P2.
8910 -- start --- P2 ----- P1 --- end
8912 if No
(Next
(P1
)) then
8915 -- We encounter P2 while going to the right of the list. This
8916 -- means that P1 does indeed appear earlier.
8919 -- start --- P1 ===== P2 --- end
8920 -- expanded code in between
8925 -- No need to look any further since we have located a source
8928 elsif Comes_From_Source
(P1
) then
8938 if not Comes_From_Source
(P2
) then
8939 while Present
(P2
) loop
8941 -- Neither P1 nor a source statement were located during the
8942 -- search. If we reach the start of the list, then P1 does not
8943 -- occur earlier than P2.
8946 -- start --- P2 --- P1 --- end
8948 if No
(Prev
(P2
)) then
8951 -- We encounter P1 while going to the left of the list. This
8952 -- means that P1 does indeed appear earlier.
8955 -- start --- P1 ===== P2 --- end
8956 -- expanded code in between
8961 -- No need to look any further since we have located a source
8964 elsif Comes_From_Source
(P2
) then
8974 -- At this point either both nodes came from source or we approximated
8975 -- their source locations through neighboring source statements.
8977 T1
:= Top_Level_Location
(Sloc
(P1
));
8978 T2
:= Top_Level_Location
(Sloc
(P2
));
8980 -- When two nodes come from the same instance, they have identical top
8981 -- level locations. To determine proper relation within the tree, check
8982 -- their locations within the template.
8985 return Sloc
(P1
) < Sloc
(P2
);
8987 -- The two nodes either come from unrelated instances or do not come
8988 -- from instantiated code at all.
8995 ----------------------
8996 -- Find_Actual_Type --
8997 ----------------------
8999 function Find_Actual_Type
9001 Gen_Type
: Entity_Id
) return Entity_Id
9003 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
9007 -- Special processing only applies to child units
9009 if not Is_Child_Unit
(Gen_Scope
) then
9010 return Get_Instance_Of
(Typ
);
9012 -- If designated or component type is itself a formal of the child unit,
9013 -- its instance is available.
9015 elsif Scope
(Typ
) = Gen_Scope
then
9016 return Get_Instance_Of
(Typ
);
9018 -- If the array or access type is not declared in the parent unit,
9019 -- no special processing needed.
9021 elsif not Is_Generic_Type
(Typ
)
9022 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
9024 return Get_Instance_Of
(Typ
);
9026 -- Otherwise, retrieve designated or component type by visibility
9029 T
:= Current_Entity
(Typ
);
9030 while Present
(T
) loop
9031 if In_Open_Scopes
(Scope
(T
)) then
9033 elsif Is_Generic_Actual_Type
(T
) then
9042 end Find_Actual_Type
;
9044 -----------------------------
9045 -- Freeze_Package_Instance --
9046 -----------------------------
9048 procedure Freeze_Package_Instance
9054 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean;
9055 -- Check if the generic definition and the instantiation come from
9056 -- a common scope, in which case the instance must be frozen after
9057 -- the generic body.
9059 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
;
9060 -- If the instance is nested inside a generic unit, the Sloc of the
9061 -- instance indicates the place of the original definition, not the
9062 -- point of the current enclosing instance. Pending a better usage of
9063 -- Slocs to indicate instantiation places, we determine the place of
9064 -- origin of a node by finding the maximum sloc of any ancestor node.
9066 -- Why is this not equivalent to Top_Level_Location ???
9072 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean is
9073 Act_Scop
: Entity_Id
:= Scope
(Act_Id
);
9074 Gen_Scop
: Entity_Id
:= Scope
(Gen_Id
);
9077 while Act_Scop
/= Standard_Standard
9078 and then Gen_Scop
/= Standard_Standard
9080 if Act_Scop
= Gen_Scop
then
9084 Act_Scop
:= Scope
(Act_Scop
);
9085 Gen_Scop
:= Scope
(Gen_Scop
);
9095 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
is
9102 while Present
(N1
) and then N1
/= Act_Unit
loop
9103 if Sloc
(N1
) > Res
then
9115 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N
);
9116 Par_Id
: constant Entity_Id
:= Scope
(Gen_Id
);
9117 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
9118 Gen_Unit
: constant Node_Id
:=
9119 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
9121 Body_Unit
: Node_Id
;
9123 Must_Delay
: Boolean;
9124 Orig_Body
: Node_Id
;
9126 -- Start of processing for Freeze_Package_Instance
9129 -- If the body is a subunit, the freeze point is the corresponding stub
9130 -- in the current compilation, not the subunit itself.
9132 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
9133 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
9135 Orig_Body
:= Gen_Body
;
9138 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
9140 -- If the instantiation and the generic definition appear in the same
9141 -- package declaration, this is an early instantiation. If they appear
9142 -- in the same declarative part, it is an early instantiation only if
9143 -- the generic body appears textually later, and the generic body is
9144 -- also in the main unit.
9146 -- If instance is nested within a subprogram, and the generic body
9147 -- is not, the instance is delayed because the enclosing body is. If
9148 -- instance and body are within the same scope, or the same subprogram
9149 -- body, indicate explicitly that the instance is delayed.
9152 (Gen_Unit
= Act_Unit
9153 and then (Nkind
(Gen_Unit
) in N_Generic_Package_Declaration
9154 | N_Package_Declaration
9155 or else (Gen_Unit
= Body_Unit
9157 True_Sloc
(N
, Act_Unit
) < Sloc
(Orig_Body
)))
9158 and then Is_In_Main_Unit
(Original_Node
(Gen_Unit
))
9159 and then In_Same_Scope
(Gen_Id
, Act_Id
));
9161 -- If this is an early instantiation, the freeze node is placed after
9162 -- the generic body. Otherwise, if the generic appears in an instance,
9163 -- we cannot freeze the current instance until the outer one is frozen.
9164 -- This is only relevant if the current instance is nested within some
9165 -- inner scope not itself within the outer instance. If this scope is
9166 -- a package body in the same declarative part as the outer instance,
9167 -- then that body needs to be frozen after the outer instance. Finally,
9168 -- if no delay is needed, we place the freeze node at the end of the
9169 -- current declarative part.
9171 if No
(Freeze_Node
(Act_Id
))
9172 or else not Is_List_Member
(Freeze_Node
(Act_Id
))
9174 Ensure_Freeze_Node
(Act_Id
);
9175 F_Node
:= Freeze_Node
(Act_Id
);
9178 Insert_After
(Orig_Body
, F_Node
);
9180 elsif Is_Generic_Instance
(Par_Id
)
9181 and then Present
(Freeze_Node
(Par_Id
))
9182 and then Scope
(Act_Id
) /= Par_Id
9184 -- Freeze instance of inner generic after instance of enclosing
9187 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
) then
9189 -- Handle the following case:
9191 -- package Parent_Inst is new ...
9192 -- freeze Parent_Inst []
9194 -- procedure P ... -- this body freezes Parent_Inst
9196 -- package Inst is new ...
9198 -- In this particular scenario, the freeze node for Inst must
9199 -- be inserted in the same manner as that of Parent_Inst,
9200 -- before the next source body or at the end of the declarative
9201 -- list (body not available). If body P did not exist and
9202 -- Parent_Inst was frozen after Inst, either by a body
9203 -- following Inst or at the end of the declarative region,
9204 -- the freeze node for Inst must be inserted after that of
9205 -- Parent_Inst. This relation is established by comparing
9206 -- the Slocs of Parent_Inst freeze node and Inst.
9207 -- We examine the parents of the enclosing lists to handle
9208 -- the case where the parent instance is in the visible part
9209 -- of a package declaration, and the inner instance is in
9210 -- the corresponding private part.
9212 if Parent
(List_Containing
(Freeze_Node
(Par_Id
)))
9213 = Parent
(List_Containing
(N
))
9214 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9216 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9218 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9221 -- Freeze package enclosing instance of inner generic after
9222 -- instance of enclosing generic.
9224 elsif Nkind
(Parent
(N
)) in N_Package_Body | N_Subprogram_Body
9225 and then In_Same_Declarative_Part
9226 (Parent
(Freeze_Node
(Par_Id
)), Parent
(N
))
9229 Enclosing
: Entity_Id
;
9232 Enclosing
:= Corresponding_Spec
(Parent
(N
));
9234 if No
(Enclosing
) then
9235 Enclosing
:= Defining_Entity
(Parent
(N
));
9238 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9239 Ensure_Freeze_Node
(Enclosing
);
9241 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
9243 -- The enclosing context is a subunit, insert the freeze
9244 -- node after the stub.
9246 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
9247 Insert_Freeze_Node_For_Instance
9248 (Corresponding_Stub
(Parent
(Parent
(N
))),
9249 Freeze_Node
(Enclosing
));
9251 -- The enclosing context is a package with a stub body
9252 -- which has already been replaced by the real body.
9253 -- Insert the freeze node after the actual body.
9255 elsif Ekind
(Enclosing
) = E_Package
9256 and then Present
(Body_Entity
(Enclosing
))
9257 and then Was_Originally_Stub
9258 (Parent
(Body_Entity
(Enclosing
)))
9260 Insert_Freeze_Node_For_Instance
9261 (Parent
(Body_Entity
(Enclosing
)),
9262 Freeze_Node
(Enclosing
));
9264 -- The parent instance has been frozen before the body of
9265 -- the enclosing package, insert the freeze node after
9268 elsif In_Same_List
(Freeze_Node
(Par_Id
), Parent
(N
))
9270 Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(Parent
(N
))
9272 Insert_Freeze_Node_For_Instance
9273 (Parent
(N
), Freeze_Node
(Enclosing
));
9277 (Freeze_Node
(Par_Id
), Freeze_Node
(Enclosing
));
9283 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9287 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9290 end Freeze_Package_Instance
;
9292 --------------------------------
9293 -- Freeze_Subprogram_Instance --
9294 --------------------------------
9296 procedure Freeze_Subprogram_Instance
9299 Pack_Id
: Entity_Id
)
9301 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
9302 -- Find innermost package body that encloses the given node, and which
9303 -- is not a compilation unit. Freeze nodes for the instance, or for its
9304 -- enclosing body, may be inserted after the enclosing_body of the
9305 -- generic unit. Used to determine proper placement of freeze node for
9306 -- both package and subprogram instances.
9308 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
9309 -- Find entity for given package body, and locate or create a freeze
9312 ----------------------------
9313 -- Enclosing_Package_Body --
9314 ----------------------------
9316 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
9322 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9324 if Nkind
(P
) = N_Package_Body
then
9325 if Nkind
(Parent
(P
)) = N_Subunit
then
9326 return Corresponding_Stub
(Parent
(P
));
9332 P
:= True_Parent
(P
);
9336 end Enclosing_Package_Body
;
9338 -------------------------
9339 -- Package_Freeze_Node --
9340 -------------------------
9342 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
9346 if Nkind
(B
) = N_Package_Body
then
9347 Id
:= Corresponding_Spec
(B
);
9348 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
9349 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
9352 Ensure_Freeze_Node
(Id
);
9353 return Freeze_Node
(Id
);
9354 end Package_Freeze_Node
;
9358 Enc_G
: constant Node_Id
:= Enclosing_Package_Body
(Gen_Body
);
9359 Enc_N
: constant Node_Id
:= Enclosing_Package_Body
(N
);
9360 Par_Id
: constant Entity_Id
:= Scope
(Get_Generic_Entity
(N
));
9365 -- Start of processing for Freeze_Subprogram_Instance
9368 -- If the instance and the generic body appear within the same unit, and
9369 -- the instance precedes the generic, the freeze node for the instance
9370 -- must appear after that of the generic. If the generic is nested
9371 -- within another instance I2, then current instance must be frozen
9372 -- after I2. In both cases, the freeze nodes are those of enclosing
9373 -- packages. Otherwise, the freeze node is placed at the end of the
9374 -- current declarative part.
9376 Ensure_Freeze_Node
(Pack_Id
);
9377 F_Node
:= Freeze_Node
(Pack_Id
);
9379 if Is_Generic_Instance
(Par_Id
)
9380 and then Present
(Freeze_Node
(Par_Id
))
9381 and then In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), N
)
9383 -- The parent was a premature instantiation. Insert freeze node at
9384 -- the end the current declarative part.
9386 if Is_Known_Guaranteed_ABE
(Get_Unit_Instantiation_Node
(Par_Id
)) then
9387 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9389 -- Handle the following case:
9391 -- package Parent_Inst is new ...
9392 -- freeze Parent_Inst []
9394 -- procedure P ... -- this body freezes Parent_Inst
9396 -- procedure Inst is new ...
9398 -- In this particular scenario, the freeze node for Inst must be
9399 -- inserted in the same manner as that of Parent_Inst - before the
9400 -- next source body or at the end of the declarative list (body not
9401 -- available). If body P did not exist and Parent_Inst was frozen
9402 -- after Inst, either by a body following Inst or at the end of the
9403 -- declarative region, the freeze node for Inst must be inserted
9404 -- after that of Parent_Inst. This relation is established by
9405 -- comparing the Slocs of Parent_Inst freeze node and Inst.
9407 elsif In_Same_List
(Freeze_Node
(Par_Id
), N
)
9408 and then Sloc
(Freeze_Node
(Par_Id
)) <= Sloc
(N
)
9410 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9413 Insert_After
(Freeze_Node
(Par_Id
), F_Node
);
9416 -- The body enclosing the instance should be frozen after the body that
9417 -- includes the generic, because the body of the instance may make
9418 -- references to entities therein. If the two are not in the same
9419 -- declarative part, or if the one enclosing the instance is frozen
9420 -- already, freeze the instance at the end of the current declarative
9423 elsif Is_Generic_Instance
(Par_Id
)
9424 and then Present
(Freeze_Node
(Par_Id
))
9425 and then Present
(Enc_N
)
9427 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par_Id
)), Enc_N
)
9429 -- The enclosing package may contain several instances. Rather
9430 -- than computing the earliest point at which to insert its freeze
9431 -- node, we place it at the end of the declarative part of the
9432 -- parent of the generic.
9434 Insert_Freeze_Node_For_Instance
9435 (Freeze_Node
(Par_Id
), Package_Freeze_Node
(Enc_N
));
9438 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9440 elsif Present
(Enc_G
)
9441 and then Present
(Enc_N
)
9442 and then Enc_G
/= Enc_N
9443 and then Earlier
(N
, Gen_Body
)
9445 -- Freeze package that encloses instance, and place node after the
9446 -- package that encloses generic. If enclosing package is already
9447 -- frozen we have to assume it is at the proper place. This may be a
9448 -- potential ABE that requires dynamic checking. Do not add a freeze
9449 -- node if the package that encloses the generic is inside the body
9450 -- that encloses the instance, because the freeze node would be in
9451 -- the wrong scope. Additional contortions needed if the bodies are
9452 -- within a subunit.
9455 Enclosing_Body
: Node_Id
;
9458 if Nkind
(Enc_N
) = N_Package_Body_Stub
then
9459 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_N
)));
9461 Enclosing_Body
:= Enc_N
;
9464 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
9465 Insert_Freeze_Node_For_Instance
9466 (Enc_G
, Package_Freeze_Node
(Enc_N
));
9470 -- Freeze enclosing subunit before instance
9472 Enc_G_F
:= Package_Freeze_Node
(Enc_G
);
9474 if not Is_List_Member
(Enc_G_F
) then
9475 Insert_After
(Enc_G
, Enc_G_F
);
9478 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9481 -- If none of the above, insert freeze node at the end of the current
9482 -- declarative part.
9484 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9486 end Freeze_Subprogram_Instance
;
9492 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
9494 return Generic_Renamings
.Table
(E
).Gen_Id
;
9497 ---------------------
9498 -- Get_Instance_Of --
9499 ---------------------
9501 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
9502 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
9505 if Res
/= Assoc_Null
then
9506 return Generic_Renamings
.Table
(Res
).Act_Id
;
9509 -- On exit, entity is not instantiated: not a generic parameter, or
9510 -- else parameter of an inner generic unit.
9514 end Get_Instance_Of
;
9516 ---------------------------------
9517 -- Get_Unit_Instantiation_Node --
9518 ---------------------------------
9520 function Get_Unit_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
9521 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
9525 -- If the Package_Instantiation attribute has been set on the package
9526 -- entity, then use it directly when it (or its Original_Node) refers
9527 -- to an N_Package_Instantiation node. In principle it should be
9528 -- possible to have this field set in all cases, which should be
9529 -- investigated, and would allow this function to be significantly
9532 Inst
:= Package_Instantiation
(A
);
9534 if Present
(Inst
) then
9535 if Nkind
(Inst
) = N_Package_Instantiation
then
9538 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
9539 return Original_Node
(Inst
);
9543 -- If the instantiation is a compilation unit that does not need body
9544 -- then the instantiation node has been rewritten as a package
9545 -- declaration for the instance, and we return the original node.
9547 -- If it is a compilation unit and the instance node has not been
9548 -- rewritten, then it is still the unit of the compilation. Finally, if
9549 -- a body is present, this is a parent of the main unit whose body has
9550 -- been compiled for inlining purposes, and the instantiation node has
9551 -- been rewritten with the instance body.
9553 -- Otherwise the instantiation node appears after the declaration. If
9554 -- the entity is a formal package, the declaration may have been
9555 -- rewritten as a generic declaration (in the case of a formal with box)
9556 -- or left as a formal package declaration if it has actuals, and is
9557 -- found with a forward search.
9559 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
9560 if Nkind
(Decl
) = N_Package_Declaration
9561 and then Present
(Corresponding_Body
(Decl
))
9563 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
9566 if Nkind
(Original_Node
(Decl
)) in N_Generic_Instantiation
then
9567 return Original_Node
(Decl
);
9569 return Unit
(Parent
(Decl
));
9572 elsif Nkind
(Decl
) = N_Package_Declaration
9573 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
9575 return Original_Node
(Decl
);
9578 Inst
:= Next
(Decl
);
9579 while Nkind
(Inst
) not in N_Formal_Package_Declaration
9580 | N_Function_Instantiation
9581 | N_Package_Instantiation
9582 | N_Procedure_Instantiation
9589 end Get_Unit_Instantiation_Node
;
9591 ------------------------
9592 -- Has_Been_Exchanged --
9593 ------------------------
9595 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
9599 Next
:= First_Elmt
(Exchanged_Views
);
9600 while Present
(Next
) loop
9601 if Full_View
(Node
(Next
)) = E
then
9609 end Has_Been_Exchanged
;
9615 function Has_Contracts
(Decl
: Node_Id
) return Boolean is
9616 A_List
: constant List_Id
:= Aspect_Specifications
(Decl
);
9623 A_Spec
:= First
(A_List
);
9624 while Present
(A_Spec
) loop
9625 A_Id
:= Get_Aspect_Id
(A_Spec
);
9626 if A_Id
= Aspect_Pre
or else A_Id
= Aspect_Post
then
9641 function Hash
(F
: Entity_Id
) return HTable_Range
is
9643 return HTable_Range
(F
mod HTable_Size
);
9646 ------------------------
9647 -- Hide_Current_Scope --
9648 ------------------------
9650 procedure Hide_Current_Scope
is
9651 C
: constant Entity_Id
:= Current_Scope
;
9655 Set_Is_Hidden_Open_Scope
(C
);
9657 E
:= First_Entity
(C
);
9658 while Present
(E
) loop
9659 if Is_Immediately_Visible
(E
) then
9660 Set_Is_Immediately_Visible
(E
, False);
9661 Append_Elmt
(E
, Hidden_Entities
);
9667 -- Make the scope name invisible as well. This is necessary, but might
9668 -- conflict with calls to Rtsfind later on, in case the scope is a
9669 -- predefined one. There is no clean solution to this problem, so for
9670 -- now we depend on the user not redefining Standard itself in one of
9671 -- the parent units.
9673 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
9674 Set_Is_Immediately_Visible
(C
, False);
9675 Append_Elmt
(C
, Hidden_Entities
);
9678 end Hide_Current_Scope
;
9684 procedure Init_Env
is
9685 Saved
: Instance_Env
;
9688 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
9689 Saved
.Exchanged_Views
:= Exchanged_Views
;
9690 Saved
.Hidden_Entities
:= Hidden_Entities
;
9691 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
9692 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
9693 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
9695 -- Save configuration switches. These may be reset if the unit is a
9696 -- predefined unit, and the current mode is not Ada 2005.
9698 Saved
.Switches
:= Save_Config_Switches
;
9700 Instance_Envs
.Append
(Saved
);
9702 Exchanged_Views
:= New_Elmt_List
;
9703 Hidden_Entities
:= New_Elmt_List
;
9705 -- Make dummy entry for Instantiated parent. If generic unit is legal,
9706 -- this is set properly in Set_Instance_Env.
9708 Current_Instantiated_Parent
:=
9709 (Current_Scope
, Current_Scope
, Assoc_Null
);
9712 ---------------------
9713 -- In_Main_Context --
9714 ---------------------
9716 function In_Main_Context
(E
: Entity_Id
) return Boolean is
9722 if not Is_Compilation_Unit
(E
)
9723 or else Ekind
(E
) /= E_Package
9724 or else In_Private_Part
(E
)
9729 Context
:= Context_Items
(Cunit
(Main_Unit
));
9731 Clause
:= First
(Context
);
9732 while Present
(Clause
) loop
9733 if Nkind
(Clause
) = N_With_Clause
then
9734 Nam
:= Name
(Clause
);
9736 -- If the current scope is part of the context of the main unit,
9737 -- analysis of the corresponding with_clause is not complete, and
9738 -- the entity is not set. We use the Chars field directly, which
9739 -- might produce false positives in rare cases, but guarantees
9740 -- that we produce all the instance bodies we will need.
9742 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
9743 or else (Nkind
(Nam
) = N_Selected_Component
9744 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
9754 end In_Main_Context
;
9756 ---------------------
9757 -- Inherit_Context --
9758 ---------------------
9760 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
9761 Current_Context
: List_Id
;
9762 Current_Unit
: Node_Id
;
9771 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
9773 -- The inherited context is attached to the enclosing compilation
9774 -- unit. This is either the main unit, or the declaration for the
9775 -- main unit (in case the instantiation appears within the package
9776 -- declaration and the main unit is its body).
9778 Current_Unit
:= Parent
(Inst
);
9779 while Present
(Current_Unit
)
9780 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
9782 Current_Unit
:= Parent
(Current_Unit
);
9785 Current_Context
:= Context_Items
(Current_Unit
);
9787 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
9788 while Present
(Item
) loop
9789 if Nkind
(Item
) = N_With_Clause
then
9790 Lib_Unit
:= Library_Unit
(Item
);
9792 -- Take care to prevent direct cyclic with's
9794 if Lib_Unit
/= Current_Unit
then
9796 -- Do not add a unit if it is already in the context
9798 Clause
:= First
(Current_Context
);
9800 while Present
(Clause
) loop
9801 if Nkind
(Clause
) = N_With_Clause
9802 and then Library_Unit
(Clause
) = Lib_Unit
9812 New_I
:= New_Copy
(Item
);
9813 Set_Implicit_With
(New_I
);
9815 Append
(New_I
, Current_Context
);
9823 end Inherit_Context
;
9829 procedure Initialize
is
9831 Generic_Renamings
.Init
;
9834 Generic_Renamings_HTable
.Reset
;
9835 Circularity_Detected
:= False;
9836 Exchanged_Views
:= No_Elist
;
9837 Hidden_Entities
:= No_Elist
;
9840 -------------------------------------
9841 -- Insert_Freeze_Node_For_Instance --
9842 -------------------------------------
9844 procedure Insert_Freeze_Node_For_Instance
9848 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
9849 -- Find enclosing package or subprogram body, if any. Freeze node may
9850 -- be placed at end of current declarative list if previous instance
9851 -- and current one have different enclosing bodies.
9853 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
9854 -- Find the local instance, if any, that declares the generic that is
9855 -- being instantiated. If present, the freeze node for this instance
9856 -- must follow the freeze node for the previous instance.
9858 --------------------
9859 -- Enclosing_Body --
9860 --------------------
9862 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
9868 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9870 if Nkind
(P
) in N_Package_Body | N_Subprogram_Body
then
9871 if Nkind
(Parent
(P
)) = N_Subunit
then
9872 return Corresponding_Stub
(Parent
(P
));
9878 P
:= True_Parent
(P
);
9884 -----------------------
9885 -- Previous_Instance --
9886 -----------------------
9888 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
9893 while Present
(S
) and then S
/= Standard_Standard
loop
9894 if Is_Generic_Instance
(S
)
9895 and then In_Same_Source_Unit
(S
, N
)
9904 end Previous_Instance
;
9914 -- Start of processing for Insert_Freeze_Node_For_Instance
9917 -- Nothing to do if the freeze node has already been inserted
9919 if Is_List_Member
(F_Node
) then
9923 Inst
:= Entity
(F_Node
);
9925 -- When processing a subprogram instantiation, utilize the actual
9926 -- subprogram instantiation rather than its package wrapper as it
9927 -- carries all the context information.
9929 if Is_Wrapper_Package
(Inst
) then
9930 Inst
:= Related_Instance
(Inst
);
9933 Par_Inst
:= Parent
(Inst
);
9935 -- If this is a package instance, check whether the generic is declared
9936 -- in a previous instance and the current instance is not within the
9939 if Present
(Generic_Parent
(Par_Inst
)) and then Is_In_Main_Unit
(N
) then
9941 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
9942 Par_I
: constant Entity_Id
:=
9943 Previous_Instance
(Generic_Parent
(Par_Inst
));
9947 if Present
(Par_I
) and then Earlier
(N
, Freeze_Node
(Par_I
)) then
9948 Scop
:= Scope
(Inst
);
9950 -- If the current instance is within the one that contains
9951 -- the generic, the freeze node for the current one must
9952 -- appear in the current declarative part. Ditto, if the
9953 -- current instance is within another package instance or
9954 -- within a body that does not enclose the current instance.
9955 -- In these three cases the freeze node of the previous
9956 -- instance is not relevant.
9958 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
9959 exit when Scop
= Par_I
9961 (Is_Generic_Instance
(Scop
)
9962 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
9963 Scop
:= Scope
(Scop
);
9966 -- Previous instance encloses current instance
9968 if Scop
= Par_I
then
9971 -- If the next node is a source body we must freeze in the
9972 -- current scope as well.
9974 elsif Present
(Next
(N
))
9975 and then Nkind
(Next
(N
)) in N_Subprogram_Body
9977 and then Comes_From_Source
(Next
(N
))
9981 -- Current instance is within an unrelated instance
9983 elsif Is_Generic_Instance
(Scop
) then
9986 -- Current instance is within an unrelated body
9988 elsif Present
(Enclosing_N
)
9989 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
9994 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
10002 Decls
:= List_Containing
(N
);
10003 Par_N
:= Parent
(Decls
);
10005 -- Determine the proper freeze point of an instantiation
10007 if Is_Generic_Instance
(Inst
) then
10009 -- When the instantiation occurs in a package spec, append the
10010 -- freeze node to the private declarations (if any).
10012 if Nkind
(Par_N
) = N_Package_Specification
10013 and then Decls
= Visible_Declarations
(Par_N
)
10014 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
10016 Decls
:= Private_Declarations
(Par_N
);
10017 Decl
:= First
(Decls
);
10020 -- We adhere to the general rule of a package or subprogram body
10021 -- causing freezing of anything before it in the same declarative
10022 -- region. In this respect, the proper freeze point of a package
10023 -- instantiation is before the first source body which follows, or
10024 -- before a stub. This ensures that entities from the instance are
10025 -- already frozen and therefore usable in source bodies.
10027 if Nkind
(Par_N
) /= N_Package_Declaration
10029 not In_Same_Source_Unit
(Generic_Parent
(Par_Inst
), Inst
)
10031 while Present
(Decl
) loop
10032 if (Nkind
(Decl
) in N_Unit_Body
10034 Nkind
(Decl
) in N_Body_Stub
)
10035 and then Comes_From_Source
(Decl
)
10037 Set_Sloc
(F_Node
, Sloc
(Decl
));
10038 Insert_Before
(Decl
, F_Node
);
10046 -- When the instantiation occurs in a package spec and there is
10047 -- no source body which follows, and the package has a body but
10048 -- is delayed, then insert immediately before its freeze node.
10050 if Nkind
(Par_N
) = N_Package_Specification
10051 and then Present
(Corresponding_Body
(Parent
(Par_N
)))
10052 and then Present
(Freeze_Node
(Defining_Entity
(Par_N
)))
10054 Set_Sloc
(F_Node
, Sloc
(Freeze_Node
(Defining_Entity
(Par_N
))));
10055 Insert_Before
(Freeze_Node
(Defining_Entity
(Par_N
)), F_Node
);
10058 -- When the instantiation occurs in a package spec and there is
10059 -- no source body which follows, not even of the package itself
10060 -- then insert into the declaration list of the outer level.
10062 elsif Nkind
(Par_N
) = N_Package_Specification
10063 and then No
(Corresponding_Body
(Parent
(Par_N
)))
10064 and then Is_List_Member
(Parent
(Par_N
))
10066 Decl
:= Parent
(Par_N
);
10067 Decls
:= List_Containing
(Decl
);
10068 Par_N
:= Parent
(Decls
);
10070 -- In a package declaration, or if no source body which follows
10071 -- and at library level, then insert at end of list.
10079 -- Insert and adjust the Sloc of the freeze node
10081 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
10082 Insert_After
(Last
(Decls
), F_Node
);
10083 end Insert_Freeze_Node_For_Instance
;
10085 -----------------------------
10086 -- Install_Formal_Packages --
10087 -----------------------------
10089 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
10092 Gen_E
: Entity_Id
:= Empty
;
10095 E
:= First_Entity
(Par
);
10097 -- If we are installing an instance parent, locate the formal packages
10098 -- of its generic parent.
10100 if Is_Generic_Instance
(Par
) then
10101 Gen
:= Generic_Parent
(Package_Specification
(Par
));
10102 Gen_E
:= First_Entity
(Gen
);
10105 while Present
(E
) loop
10106 if Ekind
(E
) = E_Package
10107 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
10109 -- If this is the renaming for the parent instance, done
10111 if Renamed_Entity
(E
) = Par
then
10114 -- The visibility of a formal of an enclosing generic is already
10117 elsif Denotes_Formal_Package
(E
) then
10120 elsif Present
(Associated_Formal_Package
(E
)) then
10121 Check_Generic_Actuals
(Renamed_Entity
(E
), True);
10122 Set_Is_Hidden
(E
, False);
10124 -- Find formal package in generic unit that corresponds to
10125 -- (instance of) formal package in instance.
10127 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
10128 Next_Entity
(Gen_E
);
10131 if Present
(Gen_E
) then
10132 Map_Formal_Package_Entities
(Gen_E
, E
);
10139 if Present
(Gen_E
) then
10140 Next_Entity
(Gen_E
);
10143 end Install_Formal_Packages
;
10145 --------------------
10146 -- Install_Parent --
10147 --------------------
10149 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
10150 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
10151 S
: constant Entity_Id
:= Current_Scope
;
10152 Inst_Par
: Entity_Id
;
10153 First_Par
: Entity_Id
;
10154 Inst_Node
: Node_Id
;
10155 Gen_Par
: Entity_Id
;
10156 First_Gen
: Entity_Id
;
10159 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
10160 -- Install the scopes of noninstance parent units ending with Par
10162 procedure Install_Spec
(Par
: Entity_Id
);
10163 -- The child unit is within the declarative part of the parent, so the
10164 -- declarations within the parent are immediately visible.
10166 -------------------------------
10167 -- Install_Noninstance_Specs --
10168 -------------------------------
10170 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
10173 and then Par
/= Standard_Standard
10174 and then not In_Open_Scopes
(Par
)
10176 Install_Noninstance_Specs
(Scope
(Par
));
10177 Install_Spec
(Par
);
10179 end Install_Noninstance_Specs
;
10185 procedure Install_Spec
(Par
: Entity_Id
) is
10186 Spec
: constant Node_Id
:= Package_Specification
(Par
);
10189 -- If this parent of the child instance is a top-level unit,
10190 -- then record the unit and its visibility for later resetting in
10191 -- Remove_Parent. We exclude units that are generic instances, as we
10192 -- only want to record this information for the ultimate top-level
10193 -- noninstance parent (is that always correct???).
10195 if Scope
(Par
) = Standard_Standard
10196 and then not Is_Generic_Instance
(Par
)
10198 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
10199 Instance_Parent_Unit
:= Par
;
10202 -- Open the parent scope and make it and its declarations visible.
10203 -- If this point is not within a body, then only the visible
10204 -- declarations should be made visible, and installation of the
10205 -- private declarations is deferred until the appropriate point
10206 -- within analysis of the spec being instantiated (see the handling
10207 -- of parent visibility in Analyze_Package_Specification). This is
10208 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
10209 -- private view problems that occur when compiling instantiations of
10210 -- a generic child of that package (Generic_Dispatching_Constructor).
10211 -- If the instance freezes a tagged type, inlinings of operations
10212 -- from Ada.Tags may need the full view of type Tag. If inlining took
10213 -- proper account of establishing visibility of inlined subprograms'
10214 -- parents then it should be possible to remove this
10215 -- special check. ???
10218 Set_Is_Immediately_Visible
(Par
);
10219 Install_Visible_Declarations
(Par
);
10220 Set_Use
(Visible_Declarations
(Spec
));
10222 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
10223 Install_Private_Declarations
(Par
);
10224 Set_Use
(Private_Declarations
(Spec
));
10228 -- Start of processing for Install_Parent
10231 -- We need to install the parent instance to compile the instantiation
10232 -- of the child, but the child instance must appear in the current
10233 -- scope. Given that we cannot place the parent above the current scope
10234 -- in the scope stack, we duplicate the current scope and unstack both
10235 -- after the instantiation is complete.
10237 -- If the parent is itself the instantiation of a child unit, we must
10238 -- also stack the instantiation of its parent, and so on. Each such
10239 -- ancestor is the prefix of the name in a prior instantiation.
10241 -- If this is a nested instance, the parent unit itself resolves to
10242 -- a renaming of the parent instance, whose declaration we need.
10244 -- Finally, the parent may be a generic (not an instance) when the
10245 -- child unit appears as a formal package.
10249 if Present
(Renamed_Entity
(Inst_Par
)) then
10250 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10253 First_Par
:= Inst_Par
;
10255 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10257 First_Gen
:= Gen_Par
;
10259 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
10261 -- Load grandparent instance as well
10263 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
10265 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
10266 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
10268 if Present
(Renamed_Entity
(Inst_Par
)) then
10269 Inst_Par
:= Renamed_Entity
(Inst_Par
);
10272 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
10274 if Present
(Gen_Par
) then
10275 Prepend_Elmt
(Inst_Par
, Ancestors
);
10278 -- Parent is not the name of an instantiation
10280 Install_Noninstance_Specs
(Inst_Par
);
10291 if Present
(First_Gen
) then
10292 Append_Elmt
(First_Par
, Ancestors
);
10294 Install_Noninstance_Specs
(First_Par
);
10297 if not Is_Empty_Elmt_List
(Ancestors
) then
10298 Elmt
:= First_Elmt
(Ancestors
);
10299 while Present
(Elmt
) loop
10300 Install_Spec
(Node
(Elmt
));
10301 Install_Formal_Packages
(Node
(Elmt
));
10306 if not In_Body
then
10309 end Install_Parent
;
10311 -------------------------------
10312 -- Install_Hidden_Primitives --
10313 -------------------------------
10315 procedure Install_Hidden_Primitives
10316 (Prims_List
: in out Elist_Id
;
10321 List
: Elist_Id
:= No_Elist
;
10322 Prim_G_Elmt
: Elmt_Id
;
10323 Prim_A_Elmt
: Elmt_Id
;
10328 -- No action needed in case of serious errors because we cannot trust
10329 -- in the order of primitives
10331 if Serious_Errors_Detected
> 0 then
10334 -- No action possible if we don't have available the list of primitive
10338 or else not Is_Record_Type
(Gen_T
)
10339 or else not Is_Tagged_Type
(Gen_T
)
10340 or else not Is_Record_Type
(Act_T
)
10341 or else not Is_Tagged_Type
(Act_T
)
10345 -- There is no need to handle interface types since their primitives
10346 -- cannot be hidden
10348 elsif Is_Interface
(Gen_T
) then
10352 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
10354 if not Is_Class_Wide_Type
(Act_T
) then
10355 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
10357 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
10361 -- Skip predefined primitives in the generic formal
10363 while Present
(Prim_G_Elmt
)
10364 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
10366 Next_Elmt
(Prim_G_Elmt
);
10369 -- Skip predefined primitives in the generic actual
10371 while Present
(Prim_A_Elmt
)
10372 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
10374 Next_Elmt
(Prim_A_Elmt
);
10377 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
10379 Prim_G
:= Node
(Prim_G_Elmt
);
10380 Prim_A
:= Node
(Prim_A_Elmt
);
10382 -- There is no need to handle interface primitives because their
10383 -- primitives are not hidden
10385 exit when Present
(Interface_Alias
(Prim_G
));
10387 -- Here we install one hidden primitive
10389 if Chars
(Prim_G
) /= Chars
(Prim_A
)
10390 and then Has_Suffix
(Prim_A
, 'P')
10391 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
10393 Set_Chars
(Prim_A
, Chars
(Prim_G
));
10394 Append_New_Elmt
(Prim_A
, To
=> List
);
10397 Next_Elmt
(Prim_A_Elmt
);
10398 Next_Elmt
(Prim_G_Elmt
);
10401 -- Append the elements to the list of temporarily visible primitives
10402 -- avoiding duplicates.
10404 if Present
(List
) then
10405 if No
(Prims_List
) then
10406 Prims_List
:= New_Elmt_List
;
10409 Elmt
:= First_Elmt
(List
);
10410 while Present
(Elmt
) loop
10411 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
10415 end Install_Hidden_Primitives
;
10417 -------------------------------
10418 -- Restore_Hidden_Primitives --
10419 -------------------------------
10421 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
10422 Prim_Elmt
: Elmt_Id
;
10426 if Prims_List
/= No_Elist
then
10427 Prim_Elmt
:= First_Elmt
(Prims_List
);
10428 while Present
(Prim_Elmt
) loop
10429 Prim
:= Node
(Prim_Elmt
);
10430 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
10431 Next_Elmt
(Prim_Elmt
);
10434 Prims_List
:= No_Elist
;
10436 end Restore_Hidden_Primitives
;
10438 --------------------------------
10439 -- Instantiate_Formal_Package --
10440 --------------------------------
10442 function Instantiate_Formal_Package
10445 Analyzed_Formal
: Node_Id
) return List_Id
10447 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10448 Hidden_Formals
: constant Elist_Id
:= New_Elmt_List
;
10449 Actual_Pack
: Entity_Id
;
10450 Formal_Pack
: Entity_Id
;
10451 Gen_Parent
: Entity_Id
;
10454 Parent_Spec
: Node_Id
;
10456 procedure Find_Matching_Actual
10458 Act
: in out Entity_Id
);
10459 -- We need to associate each formal entity in the formal package with
10460 -- the corresponding entity in the actual package. The actual package
10461 -- has been analyzed and possibly expanded, and as a result there is
10462 -- no one-to-one correspondence between the two lists (for example,
10463 -- the actual may include subtypes, itypes, and inherited primitive
10464 -- operations, interspersed among the renaming declarations for the
10465 -- actuals). We retrieve the corresponding actual by name because each
10466 -- actual has the same name as the formal, and they do appear in the
10469 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
10470 -- Retrieve entity of defining entity of generic formal parameter.
10471 -- Only the declarations of formals need to be considered when
10472 -- linking them to actuals, but the declarative list may include
10473 -- internal entities generated during analysis, and those are ignored.
10475 procedure Match_Formal_Entity
10476 (Formal_Node
: Node_Id
;
10477 Formal_Ent
: Entity_Id
;
10478 Actual_Ent
: Entity_Id
);
10479 -- Associates the formal entity with the actual. In the case where
10480 -- Formal_Ent is a formal package, this procedure iterates through all
10481 -- of its formals and enters associations between the actuals occurring
10482 -- in the formal package's corresponding actual package (given by
10483 -- Actual_Ent) and the formal package's formal parameters. This
10484 -- procedure recurses if any of the parameters is itself a package.
10486 function Is_Instance_Of
10487 (Act_Spec
: Entity_Id
;
10488 Gen_Anc
: Entity_Id
) return Boolean;
10489 -- The actual can be an instantiation of a generic within another
10490 -- instance, in which case there is no direct link from it to the
10491 -- original generic ancestor. In that case, we recognize that the
10492 -- ultimate ancestor is the same by examining names and scopes.
10494 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
10495 -- If the current formal is declared with a box, its own formals are
10496 -- visible in the instance, as they were in the generic, and their
10497 -- Hidden flag must be reset. If some of these formals are themselves
10498 -- packages declared with a box, the processing must be recursive.
10500 --------------------------
10501 -- Find_Matching_Actual --
10502 --------------------------
10504 procedure Find_Matching_Actual
10506 Act
: in out Entity_Id
)
10508 Formal_Ent
: Entity_Id
;
10511 case Nkind
(Original_Node
(F
)) is
10512 when N_Formal_Object_Declaration
10513 | N_Formal_Type_Declaration
10515 Formal_Ent
:= Defining_Identifier
(F
);
10517 while Present
(Act
)
10518 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10523 when N_Formal_Package_Declaration
10524 | N_Formal_Subprogram_Declaration
10525 | N_Generic_Package_Declaration
10526 | N_Package_Declaration
10528 Formal_Ent
:= Defining_Entity
(F
);
10530 while Present
(Act
)
10531 and then Chars
(Act
) /= Chars
(Formal_Ent
)
10537 raise Program_Error
;
10539 end Find_Matching_Actual
;
10541 -------------------------
10542 -- Match_Formal_Entity --
10543 -------------------------
10545 procedure Match_Formal_Entity
10546 (Formal_Node
: Node_Id
;
10547 Formal_Ent
: Entity_Id
;
10548 Actual_Ent
: Entity_Id
)
10550 Act_Pkg
: Entity_Id
;
10553 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
10555 if Ekind
(Actual_Ent
) = E_Package
then
10557 -- Record associations for each parameter
10559 Act_Pkg
:= Actual_Ent
;
10562 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
10566 Gen_Decl
: Node_Id
;
10568 Actual
: Entity_Id
;
10571 -- Retrieve the actual given in the formal package declaration
10573 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
10575 -- The actual in the formal package declaration may be a
10576 -- renamed generic package, in which case we want to retrieve
10577 -- the original generic in order to traverse its formal part.
10579 if Present
(Renamed_Entity
(Actual
)) then
10580 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
10582 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
10585 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
10587 if Present
(Formals
) then
10588 F_Node
:= First_Non_Pragma
(Formals
);
10593 while Present
(A_Ent
)
10594 and then Present
(F_Node
)
10595 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
10597 F_Ent
:= Get_Formal_Entity
(F_Node
);
10599 if Present
(F_Ent
) then
10601 -- This is a formal of the original package. Record
10602 -- association and recurse.
10604 Find_Matching_Actual
(F_Node
, A_Ent
);
10605 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
10606 Next_Entity
(A_Ent
);
10609 Next_Non_Pragma
(F_Node
);
10613 end Match_Formal_Entity
;
10615 -----------------------
10616 -- Get_Formal_Entity --
10617 -----------------------
10619 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
10620 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
10623 when N_Formal_Object_Declaration
=>
10624 return Defining_Identifier
(N
);
10626 when N_Formal_Type_Declaration
=>
10627 return Defining_Identifier
(N
);
10629 when N_Formal_Subprogram_Declaration
=>
10630 return Defining_Unit_Name
(Specification
(N
));
10632 when N_Formal_Package_Declaration
=>
10633 return Defining_Identifier
(Original_Node
(N
));
10635 when N_Generic_Package_Declaration
=>
10636 return Defining_Identifier
(Original_Node
(N
));
10638 -- All other declarations are introduced by semantic analysis and
10639 -- have no match in the actual.
10644 end Get_Formal_Entity
;
10646 --------------------
10647 -- Is_Instance_Of --
10648 --------------------
10650 function Is_Instance_Of
10651 (Act_Spec
: Entity_Id
;
10652 Gen_Anc
: Entity_Id
) return Boolean
10654 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
10657 if No
(Gen_Par
) then
10660 -- Simplest case: the generic parent of the actual is the formal
10662 elsif Gen_Par
= Gen_Anc
then
10665 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
10668 -- The actual may be obtained through several instantiations. Its
10669 -- scope must itself be an instance of a generic declared in the
10670 -- same scope as the formal. Any other case is detected above.
10672 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
10676 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
10678 end Is_Instance_Of
;
10680 ---------------------------
10681 -- Process_Nested_Formal --
10682 ---------------------------
10684 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
10688 if Present
(Associated_Formal_Package
(Formal
))
10689 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
10691 Ent
:= First_Entity
(Formal
);
10692 while Present
(Ent
) loop
10693 Set_Is_Hidden
(Ent
, False);
10694 Set_Is_Visible_Formal
(Ent
);
10695 Set_Is_Potentially_Use_Visible
10696 (Ent
, Is_Potentially_Use_Visible
(Formal
));
10698 if Ekind
(Ent
) = E_Package
then
10699 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10700 Process_Nested_Formal
(Ent
);
10706 end Process_Nested_Formal
;
10708 -- Start of processing for Instantiate_Formal_Package
10713 -- The actual must be a package instance, or else a current instance
10714 -- such as a parent generic within the body of a generic child.
10716 if not Is_Entity_Name
(Actual
)
10717 or else not Is_Package_Or_Generic_Package
(Entity
(Actual
))
10720 ("expect package instance to instantiate formal", Actual
);
10721 Abandon_Instantiation
(Actual
);
10722 raise Program_Error
;
10725 Actual_Pack
:= Entity
(Actual
);
10726 Set_Is_Instantiated
(Actual_Pack
);
10728 -- The actual may be a renamed package, or an outer generic formal
10729 -- package whose instantiation is converted into a renaming.
10731 if Present
(Renamed_Entity
(Actual_Pack
)) then
10732 Actual_Pack
:= Renamed_Entity
(Actual_Pack
);
10735 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
10736 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
10737 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
10740 Generic_Parent
(Specification
(Analyzed_Formal
));
10742 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10745 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
10746 Parent_Spec
:= Package_Specification
(Actual_Pack
);
10748 Parent_Spec
:= Parent
(Actual_Pack
);
10751 if Gen_Parent
= Any_Id
then
10753 ("previous error in declaration of formal package", Actual
);
10754 Abandon_Instantiation
(Actual
);
10756 elsif Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
)) then
10759 -- If this is the current instance of an enclosing generic, that unit
10760 -- is the generic package we need.
10762 elsif In_Open_Scopes
(Actual_Pack
)
10763 and then Ekind
(Actual_Pack
) = E_Generic_Package
10769 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
10770 Abandon_Instantiation
(Actual
);
10773 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
10774 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
10777 Make_Package_Renaming_Declaration
(Loc
,
10778 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
10779 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
10781 Set_Associated_Formal_Package
10782 (Defining_Unit_Name
(Nod
), Defining_Identifier
(Formal
));
10783 Decls
:= New_List
(Nod
);
10785 -- If the formal F has a box, then the generic declarations are
10786 -- visible in the generic G. In an instance of G, the corresponding
10787 -- entities in the actual for F (which are the actuals for the
10788 -- instantiation of the generic that F denotes) must also be made
10789 -- visible for analysis of the current instance. On exit from the
10790 -- current instance, those entities are made private again. If the
10791 -- actual is currently in use, these entities are also use-visible.
10793 -- The loop through the actual entities also steps through the formal
10794 -- entities and enters associations from formals to actuals into the
10795 -- renaming map. This is necessary to properly handle checking of
10796 -- actual parameter associations for later formals that depend on
10797 -- actuals declared in the formal package.
10799 -- In Ada 2005, partial parameterization requires that we make
10800 -- visible the actuals corresponding to formals that were defaulted
10801 -- in the formal package. There formals are identified because they
10802 -- remain formal generics within the formal package, rather than
10803 -- being renamings of the actuals supplied.
10806 Gen_Decl
: constant Node_Id
:=
10807 Unit_Declaration_Node
(Gen_Parent
);
10808 Formals
: constant List_Id
:=
10809 Generic_Formal_Declarations
(Gen_Decl
);
10811 Actual_Ent
: Entity_Id
;
10812 Actual_Of_Formal
: Node_Id
;
10813 Formal_Node
: Node_Id
;
10814 Formal_Ent
: Entity_Id
;
10817 if Present
(Formals
) then
10818 Formal_Node
:= First_Non_Pragma
(Formals
);
10820 Formal_Node
:= Empty
;
10823 Actual_Ent
:= First_Entity
(Actual_Pack
);
10824 Actual_Of_Formal
:=
10825 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
10826 while Present
(Actual_Ent
)
10827 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10829 if Present
(Formal_Node
) then
10830 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
10832 if Present
(Formal_Ent
) then
10833 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
10834 Match_Formal_Entity
(Formal_Node
, Formal_Ent
, Actual_Ent
);
10836 -- We iterate at the same time over the actuals of the
10837 -- local package created for the formal, to determine
10838 -- which one of the formals of the original generic were
10839 -- defaulted in the formal. The corresponding actual
10840 -- entities are visible in the enclosing instance.
10842 if Box_Present
(Formal
)
10844 (Present
(Actual_Of_Formal
)
10847 (Get_Formal_Entity
(Actual_Of_Formal
)))
10849 Set_Is_Hidden
(Actual_Ent
, False);
10850 Set_Is_Visible_Formal
(Actual_Ent
);
10851 Set_Is_Potentially_Use_Visible
10852 (Actual_Ent
, In_Use
(Actual_Pack
));
10854 if Ekind
(Actual_Ent
) = E_Package
then
10855 Process_Nested_Formal
(Actual_Ent
);
10859 if not Is_Hidden
(Actual_Ent
) then
10860 Append_Elmt
(Actual_Ent
, Hidden_Formals
);
10863 Set_Is_Hidden
(Actual_Ent
);
10864 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
10868 Next_Non_Pragma
(Formal_Node
);
10869 Next
(Actual_Of_Formal
);
10871 -- A formal subprogram may be overloaded, so advance in
10872 -- the list of actuals to make sure we do not match two
10873 -- successive formals to the same actual. This is only
10874 -- relevant for overloadable entities, others have
10877 if Is_Overloadable
(Actual_Ent
) then
10878 Next_Entity
(Actual_Ent
);
10882 -- No further formals to match, but the generic part may
10883 -- contain inherited operation that are not hidden in the
10884 -- enclosing instance.
10886 Next_Entity
(Actual_Ent
);
10890 -- Inherited subprograms generated by formal derived types are
10891 -- also visible if the types are.
10893 Actual_Ent
:= First_Entity
(Actual_Pack
);
10894 while Present
(Actual_Ent
)
10895 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10897 if Is_Overloadable
(Actual_Ent
)
10899 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
10901 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
10903 Set_Is_Hidden
(Actual_Ent
, False);
10904 Set_Is_Potentially_Use_Visible
10905 (Actual_Ent
, In_Use
(Actual_Pack
));
10908 Next_Entity
(Actual_Ent
);
10911 -- No conformance to check if the generic has no formal parameters
10912 -- and the formal package has no generic associations.
10914 if Is_Empty_List
(Formals
)
10916 (Box_Present
(Formal
)
10917 or else No
(Generic_Associations
(Formal
)))
10923 -- If the formal is not declared with a box, reanalyze it as an
10924 -- abbreviated instantiation, to verify the matching rules of 12.7.
10925 -- The actual checks are performed after the generic associations
10926 -- have been analyzed, to guarantee the same visibility for this
10927 -- instantiation and for the actuals.
10929 -- In Ada 2005, the generic associations for the formal can include
10930 -- defaulted parameters. These are ignored during check. This
10931 -- internal instantiation is removed from the tree after conformance
10932 -- checking, because it contains formal declarations for those
10933 -- defaulted parameters, and those should not reach the back-end.
10935 if not Box_Present
(Formal
) then
10937 I_Pack
: constant Entity_Id
:=
10938 Make_Temporary
(Sloc
(Actual
), 'P');
10941 Set_Is_Internal
(I_Pack
);
10942 Mutate_Ekind
(I_Pack
, E_Package
);
10943 Set_Hidden_In_Formal_Instance
(I_Pack
, Hidden_Formals
);
10946 Make_Package_Instantiation
(Sloc
(Actual
),
10947 Defining_Unit_Name
=> I_Pack
,
10950 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
10951 Generic_Associations
=> Generic_Associations
(Formal
)));
10957 end Instantiate_Formal_Package
;
10959 -----------------------------------
10960 -- Instantiate_Formal_Subprogram --
10961 -----------------------------------
10963 function Instantiate_Formal_Subprogram
10966 Analyzed_Formal
: Node_Id
) return Node_Id
10968 Analyzed_S
: constant Entity_Id
:=
10969 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10970 Formal_Sub
: constant Entity_Id
:=
10971 Defining_Unit_Name
(Specification
(Formal
));
10973 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
10974 -- If the generic is a child unit, the parent has been installed on the
10975 -- scope stack, but a default subprogram cannot resolve to something
10976 -- on the parent because that parent is not really part of the visible
10977 -- context (it is there to resolve explicit local entities). If the
10978 -- default has resolved in this way, we remove the entity from immediate
10979 -- visibility and analyze the node again to emit an error message or
10980 -- find another visible candidate.
10982 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
10983 -- Perform legality check and raise exception on failure
10985 -----------------------
10986 -- From_Parent_Scope --
10987 -----------------------
10989 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
10990 Gen_Scope
: Node_Id
;
10993 Gen_Scope
:= Scope
(Analyzed_S
);
10994 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
10995 if Scope
(Subp
) = Scope
(Gen_Scope
) then
10999 Gen_Scope
:= Scope
(Gen_Scope
);
11003 end From_Parent_Scope
;
11005 -----------------------------
11006 -- Valid_Actual_Subprogram --
11007 -----------------------------
11009 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
11013 if Is_Entity_Name
(Act
) then
11014 Act_E
:= Entity
(Act
);
11016 elsif Nkind
(Act
) = N_Selected_Component
11017 and then Is_Entity_Name
(Selector_Name
(Act
))
11019 Act_E
:= Entity
(Selector_Name
(Act
));
11025 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
11026 or else Nkind
(Act
) in N_Attribute_Reference
11027 | N_Indexed_Component
11028 | N_Character_Literal
11029 | N_Explicit_Dereference
11035 ("expect subprogram or entry name in instantiation of &",
11036 Instantiation_Node
, Formal_Sub
);
11037 Abandon_Instantiation
(Instantiation_Node
);
11038 end Valid_Actual_Subprogram
;
11042 Decl_Node
: Node_Id
;
11045 New_Spec
: Node_Id
;
11046 New_Subp
: Entity_Id
;
11048 -- Start of processing for Instantiate_Formal_Subprogram
11051 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
11053 -- The tree copy has created the proper instantiation sloc for the
11054 -- new specification. Use this location for all other constructed
11057 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
11059 -- Create new entity for the actual (New_Copy_Tree does not), and
11060 -- indicate that it is an actual.
11062 -- If the actual is not an entity (i.e. an attribute reference)
11063 -- and the formal includes aspect specifications for contracts,
11064 -- we create an internal name for the renaming declaration. The
11065 -- constructed wrapper contains a call to the entity in the renaming.
11066 -- This is an expansion activity, as is the wrapper creation.
11068 if Ada_Version
>= Ada_2022
11069 and then Has_Contracts
(Analyzed_Formal
)
11070 and then not Is_Entity_Name
(Actual
)
11071 and then Expander_Active
11073 New_Subp
:= Make_Temporary
(Sloc
(Actual
), 'S');
11074 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
11076 New_Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
));
11079 Mutate_Ekind
(New_Subp
, Ekind
(Analyzed_S
));
11080 Set_Is_Generic_Actual_Subprogram
(New_Subp
);
11081 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
11083 -- Create new entities for the each of the formals in the specification
11084 -- of the renaming declaration built for the actual.
11086 if Present
(Parameter_Specifications
(New_Spec
)) then
11092 F
:= First
(Parameter_Specifications
(New_Spec
));
11093 while Present
(F
) loop
11094 F_Id
:= Defining_Identifier
(F
);
11096 Set_Defining_Identifier
(F
,
11097 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
11103 -- Find entity of actual. If the actual is an attribute reference, it
11104 -- cannot be resolved here (its formal is missing) but is handled
11105 -- instead in Attribute_Renaming. If the actual is overloaded, it is
11106 -- fully resolved subsequently, when the renaming declaration for the
11107 -- formal is analyzed. If it is an explicit dereference, resolve the
11108 -- prefix but not the actual itself, to prevent interpretation as call.
11110 if Present
(Actual
) then
11111 Loc
:= Sloc
(Actual
);
11112 Set_Sloc
(New_Spec
, Loc
);
11114 if Nkind
(Actual
) = N_Operator_Symbol
then
11115 Find_Direct_Name
(Actual
);
11117 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
11118 Analyze
(Prefix
(Actual
));
11120 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
11124 Valid_Actual_Subprogram
(Actual
);
11127 elsif Present
(Default_Name
(Formal
)) then
11128 if Nkind
(Default_Name
(Formal
)) not in N_Attribute_Reference
11129 | N_Selected_Component
11130 | N_Indexed_Component
11131 | N_Character_Literal
11132 and then Present
(Entity
(Default_Name
(Formal
)))
11134 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
11136 Nam
:= New_Copy
(Default_Name
(Formal
));
11137 Set_Sloc
(Nam
, Loc
);
11140 elsif Box_Present
(Formal
) then
11142 -- Actual is resolved at the point of instantiation. Create an
11143 -- identifier or operator with the same name as the formal.
11145 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
11147 Make_Operator_Symbol
(Loc
,
11148 Chars
=> Chars
(Formal_Sub
),
11149 Strval
=> No_String
);
11151 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
11154 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
11155 and then Null_Present
(Specification
(Formal
))
11157 -- Generate null body for procedure, for use in the instance
11160 Make_Subprogram_Body
(Loc
,
11161 Specification
=> New_Spec
,
11162 Declarations
=> New_List
,
11163 Handled_Statement_Sequence
=>
11164 Make_Handled_Sequence_Of_Statements
(Loc
,
11165 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
11167 -- RM 12.6 (16.2/2): The procedure has convention Intrinsic
11169 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11171 -- Eliminate the calls to it when optimization is enabled
11173 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11176 -- Handle case of a formal function with an expression default (allowed
11177 -- when extensions are enabled).
11179 elsif Nkind
(Specification
(Formal
)) = N_Function_Specification
11180 and then Present
(Expression
(Formal
))
11182 -- Generate body for function, for use in the instance
11185 Expr
: constant Node_Id
:= New_Copy
(Expression
(Formal
));
11186 Stmt
: constant Node_Id
:= Make_Simple_Return_Statement
(Loc
);
11188 Set_Sloc
(Expr
, Loc
);
11189 Set_Expression
(Stmt
, Expr
);
11192 Make_Subprogram_Body
(Loc
,
11193 Specification
=> New_Spec
,
11194 Declarations
=> New_List
,
11195 Handled_Statement_Sequence
=>
11196 Make_Handled_Sequence_Of_Statements
(Loc
,
11197 Statements
=> New_List
(Stmt
)));
11200 -- RM 12.6 (16.2/2): Like a null procedure default, the function
11201 -- has convention Intrinsic.
11203 Set_Convention
(Defining_Unit_Name
(New_Spec
), Convention_Intrinsic
);
11205 -- Inline calls to it when optimization is enabled
11207 Set_Is_Inlined
(Defining_Unit_Name
(New_Spec
));
11211 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
11213 ("missing actual&", Instantiation_Node
, Formal_Sub
);
11215 ("\in instantiation of & declared#",
11216 Instantiation_Node
, Scope
(Analyzed_S
));
11217 Abandon_Instantiation
(Instantiation_Node
);
11221 Make_Subprogram_Renaming_Declaration
(Loc
,
11222 Specification
=> New_Spec
,
11225 -- If we do not have an actual and the formal specified <> then set to
11226 -- get proper default.
11228 if No
(Actual
) and then Box_Present
(Formal
) then
11229 Set_From_Default
(Decl_Node
);
11232 -- Gather possible interpretations for the actual before analyzing the
11233 -- instance. If overloaded, it will be resolved when analyzing the
11234 -- renaming declaration.
11236 if Box_Present
(Formal
) and then No
(Actual
) then
11239 if Is_Child_Unit
(Scope
(Analyzed_S
))
11240 and then Present
(Entity
(Nam
))
11242 if not Is_Overloaded
(Nam
) then
11243 if From_Parent_Scope
(Entity
(Nam
)) then
11244 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
11245 Set_Entity
(Nam
, Empty
);
11246 Set_Etype
(Nam
, Empty
);
11249 Set_Is_Immediately_Visible
(Entity
(Nam
));
11258 Get_First_Interp
(Nam
, I
, It
);
11259 while Present
(It
.Nam
) loop
11260 if From_Parent_Scope
(It
.Nam
) then
11264 Get_Next_Interp
(I
, It
);
11271 -- The generic instantiation freezes the actual. This can only be done
11272 -- once the actual is resolved, in the analysis of the renaming
11273 -- declaration. To make the formal subprogram entity available, we set
11274 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
11275 -- This is also needed in Analyze_Subprogram_Renaming for the processing
11276 -- of formal abstract subprograms.
11278 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
11280 -- We cannot analyze the renaming declaration, and thus find the actual,
11281 -- until all the actuals are assembled in the instance. For subsequent
11282 -- checks of other actuals, indicate the node that will hold the
11283 -- instance of this formal.
11285 Set_Instance_Of
(Analyzed_S
, Nam
);
11287 if Nkind
(Actual
) = N_Selected_Component
11288 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
11289 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
11291 -- The renaming declaration will create a body, which must appear
11292 -- outside of the instantiation, We move the renaming declaration
11293 -- out of the instance, and create an additional renaming inside,
11294 -- to prevent freezing anomalies.
11297 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
11300 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
11301 Insert_Before
(Instantiation_Node
, Decl_Node
);
11302 Analyze
(Decl_Node
);
11304 -- Now create renaming within the instance
11307 Make_Subprogram_Renaming_Declaration
(Loc
,
11308 Specification
=> New_Copy_Tree
(New_Spec
),
11309 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
11311 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
11312 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
11317 end Instantiate_Formal_Subprogram
;
11319 ------------------------
11320 -- Instantiate_Object --
11321 ------------------------
11323 function Instantiate_Object
11326 Analyzed_Formal
: Node_Id
) return List_Id
11328 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11329 A_Gen_Obj
: constant Entity_Id
:=
11330 Defining_Identifier
(Analyzed_Formal
);
11331 Acc_Def
: Node_Id
:= Empty
;
11332 Act_Assoc
: constant Node_Id
:=
11333 (if No
(Actual
) then Empty
else Parent
(Actual
));
11334 Actual_Decl
: Node_Id
:= Empty
;
11335 Decl_Node
: Node_Id
;
11338 List
: constant List_Id
:= New_List
;
11339 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
11340 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11341 Subt_Decl
: Node_Id
:= Empty
;
11342 Subt_Mark
: Node_Id
:= Empty
;
11344 -- Start of processing for Instantiate_Object
11347 -- Formal may be an anonymous access
11349 if Present
(Subtype_Mark
(Formal
)) then
11350 Subt_Mark
:= Subtype_Mark
(Formal
);
11352 Check_Access_Definition
(Formal
);
11353 Acc_Def
:= Access_Definition
(Formal
);
11356 -- Sloc for error message on missing actual
11358 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
11360 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
11361 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
11364 Set_Parent
(List
, Act_Assoc
);
11368 if Out_Present
(Formal
) then
11370 -- An IN OUT generic actual must be a name. The instantiation is a
11371 -- renaming declaration. The actual is the name being renamed. We
11372 -- use the actual directly, rather than a copy, because it is not
11373 -- used further in the list of actuals, and because a copy or a use
11374 -- of relocate_node is incorrect if the instance is nested within a
11375 -- generic. In order to simplify e.g. ASIS queries, the
11376 -- Generic_Parent field links the declaration to the generic
11379 if No
(Actual
) then
11381 ("missing actual &",
11382 Instantiation_Node
, Gen_Obj
);
11384 ("\in instantiation of & declared#",
11385 Instantiation_Node
, Scope
(A_Gen_Obj
));
11386 Abandon_Instantiation
(Instantiation_Node
);
11389 if Present
(Subt_Mark
) then
11391 Make_Object_Renaming_Declaration
(Loc
,
11392 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11393 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
11396 else pragma Assert
(Present
(Acc_Def
));
11398 Make_Object_Renaming_Declaration
(Loc
,
11399 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11400 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
11404 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11406 -- The analysis of the actual may produce Insert_Action nodes, so
11407 -- the declaration must have a context in which to attach them.
11409 Append
(Decl_Node
, List
);
11412 -- Return if the analysis of the actual reported some error
11414 if Etype
(Actual
) = Any_Type
then
11418 -- This check is performed here because Analyze_Object_Renaming will
11419 -- not check it when Comes_From_Source is False. Note though that the
11420 -- check for the actual being the name of an object will be performed
11421 -- in Analyze_Object_Renaming.
11423 if Is_Object_Reference
(Actual
)
11424 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
11427 ("illegal discriminant-dependent component for in out parameter",
11431 -- The actual has to be resolved in order to check that it is a
11432 -- variable (due to cases such as F (1), where F returns access to
11433 -- an array, and for overloaded prefixes).
11435 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
11437 -- If the type of the formal is not itself a formal, and the current
11438 -- unit is a child unit, the formal type must be declared in a
11439 -- parent, and must be retrieved by visibility.
11441 if Ftyp
= Orig_Ftyp
11442 and then Is_Generic_Unit
(Scope
(Ftyp
))
11443 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
11446 Temp
: constant Node_Id
:=
11447 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
11449 Set_Entity
(Temp
, Empty
);
11451 Ftyp
:= Entity
(Temp
);
11455 if Is_Private_Type
(Ftyp
)
11456 and then not Is_Private_Type
(Etype
(Actual
))
11457 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
11458 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
11460 -- If the actual has the type of the full view of the formal, or
11461 -- else a non-private subtype of the formal, then the visibility
11462 -- of the formal type has changed. Add to the actuals a subtype
11463 -- declaration that will force the exchange of views in the body
11464 -- of the instance as well.
11467 Make_Subtype_Declaration
(Loc
,
11468 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
11469 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
11471 Prepend
(Subt_Decl
, List
);
11473 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
11474 Exchange_Declarations
(Ftyp
);
11477 Resolve
(Actual
, Ftyp
);
11479 if not Denotes_Variable
(Actual
) then
11480 Error_Msg_NE
("actual for& must be a variable", Actual
, Gen_Obj
);
11482 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
11484 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
11485 -- the type of the actual shall resolve to a specific anonymous
11488 if Ada_Version
< Ada_2005
11489 or else not Is_Anonymous_Access_Type
(Base_Type
(Ftyp
))
11490 or else not Is_Anonymous_Access_Type
(Base_Type
(Etype
(Actual
)))
11493 ("type of actual does not match type of&", Actual
, Gen_Obj
);
11497 Note_Possible_Modification
(Actual
, Sure
=> True);
11499 -- Check for instantiation with atomic/volatile/VFA object actual for
11500 -- nonatomic/nonvolatile/nonVFA formal (RM C.6 (12)).
11502 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
11504 ("cannot instantiate nonatomic formal & of mode in out",
11506 Error_Msg_N
("\with atomic object actual (RM C.6(12))", Actual
);
11508 elsif Is_Volatile_Object_Ref
(Actual
)
11509 and then not Is_Volatile
(Orig_Ftyp
)
11512 ("cannot instantiate nonvolatile formal & of mode in out",
11514 Error_Msg_N
("\with volatile object actual (RM C.6(12))", Actual
);
11516 elsif Is_Volatile_Full_Access_Object_Ref
(Actual
)
11517 and then not Is_Volatile_Full_Access
(Orig_Ftyp
)
11520 ("cannot instantiate nonfull access formal & of mode in out",
11523 ("\with full access object actual (RM C.6(12))", Actual
);
11526 -- Check for instantiation on nonatomic subcomponent of a full access
11527 -- object in Ada 2022 (RM C.6 (12)).
11529 if Ada_Version
>= Ada_2022
11530 and then Is_Subcomponent_Of_Full_Access_Object
(Actual
)
11531 and then not Is_Atomic_Object
(Actual
)
11534 ("cannot instantiate formal & of mode in out with actual",
11537 ("\nonatomic subcomponent of full access object (RM C.6(12))",
11541 -- Check actual/formal compatibility with respect to the four
11542 -- volatility refinement aspects.
11545 Actual_Obj
: Entity_Id
;
11546 N
: Node_Id
:= Actual
;
11548 -- Similar to Sem_Util.Get_Enclosing_Object, but treat
11549 -- pointer dereference like component selection.
11551 if Is_Entity_Name
(N
) then
11552 Actual_Obj
:= Entity
(N
);
11557 when N_Indexed_Component
11558 | N_Selected_Component
11560 | N_Explicit_Dereference
11564 when N_Type_Conversion
=>
11565 N
:= Expression
(N
);
11568 Actual_Obj
:= Etype
(N
);
11573 Check_Volatility_Compatibility
11574 (Actual_Obj
, A_Gen_Obj
, "actual object",
11575 "its corresponding formal object of mode in out",
11576 Srcpos_Bearer
=> Actual
);
11579 -- Formal in-parameter
11582 -- The instantiation of a generic formal in-parameter is constant
11583 -- declaration. The actual is the expression for that declaration.
11584 -- Its type is a full copy of the type of the formal. This may be
11585 -- an access to subprogram, for which we need to generate entities
11586 -- for the formals in the new signature.
11588 if Present
(Actual
) then
11589 if Present
(Subt_Mark
) then
11590 Def
:= New_Copy_Tree
(Subt_Mark
);
11592 pragma Assert
(Present
(Acc_Def
));
11593 Def
:= New_Copy_Tree
(Acc_Def
);
11597 Make_Object_Declaration
(Loc
,
11598 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11599 Constant_Present
=> True,
11600 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11601 Object_Definition
=> Def
,
11602 Expression
=> Actual
);
11604 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11606 -- A generic formal object of a tagged type is defined to be
11607 -- aliased so the new constant must also be treated as aliased.
11609 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
11610 Set_Aliased_Present
(Decl_Node
);
11613 Append
(Decl_Node
, List
);
11615 -- No need to repeat (pre-)analysis of some expression nodes
11616 -- already handled in Preanalyze_Actuals.
11618 if Nkind
(Actual
) /= N_Allocator
then
11621 -- Return if the analysis of the actual reported some error
11623 if Etype
(Actual
) = Any_Type
then
11629 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11633 Typ
:= Get_Instance_Of
(Formal_Type
);
11635 -- If the actual appears in the current or an enclosing scope,
11636 -- use its type directly. This is relevant if it has an actual
11637 -- subtype that is distinct from its nominal one. This cannot
11638 -- be done in general because the type of the actual may
11639 -- depend on other actuals, and only be fully determined when
11640 -- the enclosing instance is analyzed.
11642 if Present
(Etype
(Actual
))
11643 and then Is_Constr_Subt_For_U_Nominal
(Etype
(Actual
))
11645 Freeze_Before
(Instantiation_Node
, Etype
(Actual
));
11647 Freeze_Before
(Instantiation_Node
, Typ
);
11650 -- If the actual is an aggregate, perform name resolution on
11651 -- its components (the analysis of an aggregate does not do it)
11652 -- to capture local names that may be hidden if the generic is
11655 if Nkind
(Actual
) = N_Aggregate
then
11656 Preanalyze_And_Resolve
(Actual
, Typ
);
11659 if Is_Limited_Type
(Typ
)
11660 and then not OK_For_Limited_Init
(Typ
, Actual
)
11663 ("initialization not allowed for limited types", Actual
);
11664 Explain_Limited_Type
(Typ
, Actual
);
11668 elsif Present
(Default_Expression
(Formal
)) then
11670 -- Use default to construct declaration
11672 if Present
(Subt_Mark
) then
11673 Def
:= New_Copy_Tree
(Subt_Mark
);
11675 pragma Assert
(Present
(Acc_Def
));
11676 Def
:= New_Copy_Tree
(Acc_Def
);
11680 Make_Object_Declaration
(Sloc
(Formal
),
11681 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11682 Constant_Present
=> True,
11683 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11684 Object_Definition
=> Def
,
11685 Expression
=> New_Copy_Tree
11686 (Default_Expression
(Formal
)));
11688 Set_Corresponding_Generic_Association
11689 (Decl_Node
, Expression
(Decl_Node
));
11691 Append
(Decl_Node
, List
);
11692 Set_Analyzed
(Expression
(Decl_Node
), False);
11695 Error_Msg_NE
("missing actual&", Instantiation_Node
, Gen_Obj
);
11696 Error_Msg_NE
("\in instantiation of & declared#",
11697 Instantiation_Node
, Scope
(A_Gen_Obj
));
11699 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
11701 -- Create dummy constant declaration so that instance can be
11702 -- analyzed, to minimize cascaded visibility errors.
11704 if Present
(Subt_Mark
) then
11706 else pragma Assert
(Present
(Acc_Def
));
11711 Make_Object_Declaration
(Loc
,
11712 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11713 Constant_Present
=> True,
11714 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11715 Object_Definition
=> New_Copy
(Def
),
11717 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
11718 Attribute_Name
=> Name_First
,
11719 Prefix
=> New_Copy
(Def
)));
11721 Append
(Decl_Node
, List
);
11724 Abandon_Instantiation
(Instantiation_Node
);
11729 if Nkind
(Actual
) in N_Has_Entity
11730 and then Present
(Entity
(Actual
))
11732 Actual_Decl
:= Parent
(Entity
(Actual
));
11735 -- Ada 2005 (AI-423) refined by AI12-0287:
11736 -- For an object_renaming_declaration with a null_exclusion or an
11737 -- access_definition that has a null_exclusion, the subtype of the
11738 -- object_name shall exclude null. In addition, if the
11739 -- object_renaming_declaration occurs within the body of a generic unit
11740 -- G or within the body of a generic unit declared within the
11741 -- declarative region of generic unit G, then:
11742 -- * if the object_name statically denotes a generic formal object of
11743 -- mode in out of G, then the declaration of that object shall have a
11745 -- * if the object_name statically denotes a call of a generic formal
11746 -- function of G, then the declaration of the result of that function
11747 -- shall have a null_exclusion.
11749 if Ada_Version
>= Ada_2005
11750 and then Present
(Actual_Decl
)
11751 and then Nkind
(Actual_Decl
) in N_Formal_Object_Declaration
11752 | N_Object_Declaration
11753 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
11754 and then not Has_Null_Exclusion
(Actual_Decl
)
11755 and then Has_Null_Exclusion
(Analyzed_Formal
)
11756 and then Ekind
(Defining_Identifier
(Analyzed_Formal
))
11757 = E_Generic_In_Out_Parameter
11758 and then ((In_Generic_Scope
(Entity
(Actual
))
11759 and then In_Package_Body
(Scope
(Entity
(Actual
))))
11760 or else not Can_Never_Be_Null
(Etype
(Actual
)))
11762 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
11764 ("actual must exclude null to match generic formal#", Actual
);
11767 -- An effectively volatile object cannot be used as an actual in a
11768 -- generic instantiation (SPARK RM 7.1.3(7)). The following check is
11769 -- relevant only when SPARK_Mode is on as it is not a standard Ada
11770 -- legality rule, and also verifies that the actual is an object.
11773 and then Present
(Actual
)
11774 and then Is_Object_Reference
(Actual
)
11775 and then Is_Effectively_Volatile_Object
(Actual
)
11776 and then not Is_Effectively_Volatile
(A_Gen_Obj
)
11779 ("volatile object cannot act as actual in generic instantiation",
11784 end Instantiate_Object
;
11786 ------------------------------
11787 -- Instantiate_Package_Body --
11788 ------------------------------
11790 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11791 -- must be replaced by gotos which jump to the end of the routine in order
11792 -- to restore the Ghost and SPARK modes.
11794 procedure Instantiate_Package_Body
11795 (Body_Info
: Pending_Body_Info
;
11796 Inlined_Body
: Boolean := False;
11797 Body_Optional
: Boolean := False)
11799 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11800 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11801 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
11802 Ctx_Parents
: Elist_Id
:= No_Elist
;
11803 Ctx_Top
: Int
:= 0;
11804 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11805 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11806 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11807 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11808 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11810 procedure Check_Initialized_Types
;
11811 -- In a generic package body, an entity of a generic private type may
11812 -- appear uninitialized. This is suspicious, unless the actual is a
11813 -- fully initialized type.
11815 procedure Install_Parents_Of_Generic_Context
11816 (Inst_Scope
: Entity_Id
;
11817 Ctx_Parents
: out Elist_Id
);
11818 -- Inst_Scope is the scope where the instance appears within; when it
11819 -- appears within a generic child package G, this routine collects and
11820 -- installs the enclosing packages of G in the scopes stack; installed
11821 -- packages are returned in Ctx_Parents.
11823 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
);
11824 -- Reverse effect after instantiation is complete
11826 -----------------------------
11827 -- Check_Initialized_Types --
11828 -----------------------------
11830 procedure Check_Initialized_Types
is
11832 Formal
: Entity_Id
;
11833 Actual
: Entity_Id
;
11834 Uninit_Var
: Entity_Id
;
11837 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
11838 while Present
(Decl
) loop
11839 Uninit_Var
:= Empty
;
11841 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
11842 Uninit_Var
:= Uninitialized_Variable
(Decl
);
11844 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
11845 and then Nkind
(Formal_Type_Definition
(Decl
)) =
11846 N_Formal_Private_Type_Definition
11849 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
11852 if Present
(Uninit_Var
) then
11853 Formal
:= Defining_Identifier
(Decl
);
11854 Actual
:= First_Entity
(Act_Decl_Id
);
11856 -- For each formal there is a subtype declaration that renames
11857 -- the actual and has the same name as the formal. Locate the
11858 -- formal for warning message about uninitialized variables
11859 -- in the generic, for which the actual type should be a fully
11860 -- initialized type.
11862 while Present
(Actual
) loop
11863 exit when Ekind
(Actual
) = E_Package
11864 and then Present
(Renamed_Entity
(Actual
));
11866 if Chars
(Actual
) = Chars
(Formal
)
11867 and then not Is_Scalar_Type
(Actual
)
11868 and then not Is_Fully_Initialized_Type
(Actual
)
11869 and then Warn_On_No_Value_Assigned
11871 Error_Msg_Node_2
:= Formal
;
11873 ("generic unit has uninitialized variable& of "
11874 & "formal private type &?v?", Actual
, Uninit_Var
);
11876 ("actual type for& should be fully initialized type?v?",
11881 Next_Entity
(Actual
);
11887 end Check_Initialized_Types
;
11889 ----------------------------------------
11890 -- Install_Parents_Of_Generic_Context --
11891 ----------------------------------------
11893 procedure Install_Parents_Of_Generic_Context
11894 (Inst_Scope
: Entity_Id
;
11895 Ctx_Parents
: out Elist_Id
)
11901 Ctx_Parents
:= New_Elmt_List
;
11903 -- Collect context parents (ie. parents where the instantiation
11904 -- appears within).
11907 while S
/= Standard_Standard
loop
11908 Prepend_Elmt
(S
, Ctx_Parents
);
11912 -- Install enclosing parents
11914 Elmt
:= First_Elmt
(Ctx_Parents
);
11915 while Present
(Elmt
) loop
11916 Push_Scope
(Node
(Elmt
));
11917 Set_Is_Immediately_Visible
(Node
(Elmt
));
11920 end Install_Parents_Of_Generic_Context
;
11922 ---------------------------------------
11923 -- Remove_Parents_Of_Generic_Context --
11924 ---------------------------------------
11926 procedure Remove_Parents_Of_Generic_Context
(Ctx_Parents
: Elist_Id
) is
11930 -- Traverse Ctx_Parents in LIFO order to check the removed scopes
11932 Elmt
:= Last_Elmt
(Ctx_Parents
);
11933 while Present
(Elmt
) loop
11934 pragma Assert
(Current_Scope
= Node
(Elmt
));
11935 Set_Is_Immediately_Visible
(Current_Scope
, False);
11938 Remove_Last_Elmt
(Ctx_Parents
);
11939 Elmt
:= Last_Elmt
(Ctx_Parents
);
11941 end Remove_Parents_Of_Generic_Context
;
11945 -- The following constants capture the context prior to instantiating
11946 -- the package body.
11948 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
11949 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11950 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
11951 Saved_ISMP
: constant Boolean :=
11952 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11953 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
11954 Local_Suppress_Stack_Top
;
11955 Saved_SC
: constant Boolean := Style_Check
;
11956 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11957 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11958 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
11959 Saved_Warn
: constant Warning_Record
:= Save_Warnings
;
11961 Act_Body
: Node_Id
;
11962 Act_Body_Id
: Entity_Id
;
11963 Act_Body_Name
: Node_Id
;
11964 Gen_Body
: Node_Id
;
11965 Gen_Body_Id
: Node_Id
;
11966 Par_Ent
: Entity_Id
:= Empty
;
11967 Par_Installed
: Boolean := False;
11968 Par_Vis
: Boolean := False;
11970 Scope_Check_Id
: Entity_Id
;
11971 Scope_Check_Last
: Nat
;
11972 -- Value of Current_Scope before calls to Install_Parents; used to check
11973 -- that scopes are correctly removed after instantiation.
11975 Vis_Prims_List
: Elist_Id
:= No_Elist
;
11976 -- List of primitives made temporarily visible in the instantiation
11977 -- to match the visibility of the formal type.
11979 -- Start of processing for Instantiate_Package_Body
11982 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11984 -- The instance body may already have been processed, as the parent of
11985 -- another instance that is inlined (Load_Parent_Of_Generic).
11987 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
11991 -- The package being instantiated may be subject to pragma Ghost. Set
11992 -- the mode now to ensure that any nodes generated during instantiation
11993 -- are properly marked as Ghost.
11995 Set_Ghost_Mode
(Act_Decl_Id
);
11997 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11999 -- Re-establish the state of information on which checks are suppressed.
12000 -- This information was set in Body_Info at the point of instantiation,
12001 -- and now we restore it so that the instance is compiled using the
12002 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
12004 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
12005 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
12007 Restore_Config_Switches
(Body_Info
.Config_Switches
);
12008 Restore_Warnings
(Body_Info
.Warnings
);
12010 if No
(Gen_Body_Id
) then
12012 -- Do not look for parent of generic body if none is required.
12013 -- This may happen when the routine is called as part of the
12014 -- Pending_Instantiations processing, when nested instances
12015 -- may precede the one generated from the main unit.
12017 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
12018 and then Body_Optional
12022 Load_Parent_Of_Generic
12023 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
12025 -- Surprisingly enough, loading the body of the parent can cause
12026 -- the body to be instantiated and the double instantiation needs
12027 -- to be prevented in order to avoid giving bogus semantic errors.
12029 -- This case can occur because of the Collect_Previous_Instances
12030 -- machinery of Load_Parent_Of_Generic, which will instantiate
12031 -- bodies that are deemed to be ahead of the body of the parent
12032 -- in the compilation unit. But the relative position of these
12033 -- bodies is computed using the mere comparison of their Sloc.
12035 -- Now suppose that you have two generic packages G and H, with
12036 -- G containing a mere instantiation of H:
12042 -- package Nested_G is
12053 -- package My_H is new H;
12057 -- and a third package Q instantiating G and Nested_G:
12063 -- package My_G is new G;
12065 -- package My_Nested_G is new My_G.My_H.Nested_G;
12069 -- The body to be instantiated is that of My_Nested_G and its
12070 -- parent is the instance My_G.My_H. This latter instantiation
12071 -- is done when My_G is analyzed, i.e. after the declarations
12072 -- of My_G and My_Nested_G have been parsed; as a result, the
12073 -- Sloc of My_G.My_H is greater than the Sloc of My_Nested_G.
12075 -- Therefore loading the body of My_G.My_H will cause the body
12076 -- of My_Nested_G to be instantiated because it is deemed to be
12077 -- ahead of My_G.My_H. This means that Load_Parent_Of_Generic
12078 -- will again be invoked on My_G.My_H, but this time with the
12079 -- Collect_Previous_Instances machinery disabled, so there is
12080 -- no endless mutual recursion and things are done in order.
12082 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12086 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12090 -- Establish global variable for sloc adjustment and for error recovery
12091 -- In the case of an instance body for an instantiation with actuals
12092 -- from a limited view, the instance body is placed at the beginning
12093 -- of the enclosing package body: use the body entity as the source
12094 -- location for nodes of the instance body.
12096 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
)) then
12098 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12099 Body_Id
: constant Node_Id
:=
12100 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12103 Instantiation_Node
:= Body_Id
;
12106 Instantiation_Node
:= Inst_Node
;
12109 if Present
(Gen_Body_Id
) then
12110 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12111 Style_Check
:= False;
12113 -- If the context of the instance is subject to SPARK_Mode "off", the
12114 -- annotation is missing, or the body is instantiated at a later pass
12115 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12116 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12119 if SPARK_Mode
/= On
12120 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12122 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12125 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12126 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12128 Create_Instantiation_Source
12129 (Inst_Node
, Gen_Body_Id
, S_Adjustment
);
12133 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12135 -- Create proper (possibly qualified) defining name for the body, to
12136 -- correspond to the one in the spec.
12139 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12140 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12142 -- Some attributes of spec entity are not inherited by body entity
12144 Set_Handler_Records
(Act_Body_Id
, No_List
);
12146 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12147 N_Defining_Program_Unit_Name
12150 Make_Defining_Program_Unit_Name
(Loc
,
12152 New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
12153 Defining_Identifier
=> Act_Body_Id
);
12155 Act_Body_Name
:= Act_Body_Id
;
12158 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
12160 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12161 Check_Generic_Actuals
(Act_Decl_Id
, False);
12162 Check_Initialized_Types
;
12164 -- Install primitives hidden at the point of the instantiation but
12165 -- visible when processing the generic formals
12171 E
:= First_Entity
(Act_Decl_Id
);
12172 while Present
(E
) loop
12174 and then not Is_Itype
(E
)
12175 and then Is_Generic_Actual_Type
(E
)
12176 and then Is_Tagged_Type
(E
)
12178 Install_Hidden_Primitives
12179 (Prims_List
=> Vis_Prims_List
,
12180 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
12188 Scope_Check_Id
:= Current_Scope
;
12189 Scope_Check_Last
:= Scope_Stack
.Last
;
12191 -- If the instantiation appears within a generic child some actual
12192 -- parameter may be the current instance of the enclosing generic
12196 Inst_Scope
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12199 if Is_Child_Unit
(Inst_Scope
)
12200 and then Ekind
(Inst_Scope
) = E_Generic_Package
12201 and then Present
(Generic_Associations
(Inst_Node
))
12203 Install_Parents_Of_Generic_Context
(Inst_Scope
, Ctx_Parents
);
12205 -- Hide them from visibility; required to avoid conflicts
12206 -- installing the parent instance.
12208 if Present
(Ctx_Parents
) then
12209 Push_Scope
(Standard_Standard
);
12210 Ctx_Top
:= Scope_Stack
.Last
;
12211 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12216 -- If it is a child unit, make the parent instance (which is an
12217 -- instance of the parent of the generic) visible. The parent
12218 -- instance is the prefix of the name of the generic unit.
12220 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12221 and then Nkind
(Gen_Id
) = N_Expanded_Name
12223 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12224 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12225 Install_Parent
(Par_Ent
, In_Body
=> True);
12226 Par_Installed
:= True;
12228 elsif Is_Child_Unit
(Gen_Unit
) then
12229 Par_Ent
:= Scope
(Gen_Unit
);
12230 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12231 Install_Parent
(Par_Ent
, In_Body
=> True);
12232 Par_Installed
:= True;
12235 -- If the instantiation is a library unit, and this is the main unit,
12236 -- then build the resulting compilation unit nodes for the instance.
12237 -- If this is a compilation unit but it is not the main unit, then it
12238 -- is the body of a unit in the context, that is being compiled
12239 -- because it is encloses some inlined unit or another generic unit
12240 -- being instantiated. In that case, this body is not part of the
12241 -- current compilation, and is not attached to the tree, but its
12242 -- parent must be set for analysis.
12244 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12246 -- Replace instance node with body of instance, and create new
12247 -- node for corresponding instance declaration.
12249 Build_Instance_Compilation_Unit_Nodes
12250 (Inst_Node
, Act_Body
, Act_Decl
);
12252 -- If the instantiation appears within a generic child package
12253 -- enable visibility of current instance of enclosing generic
12256 if Present
(Ctx_Parents
) then
12257 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12258 Analyze
(Inst_Node
);
12259 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12261 Analyze
(Inst_Node
);
12264 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12266 -- If the instance is a child unit itself, then set the scope
12267 -- of the expanded body to be the parent of the instantiation
12268 -- (ensuring that the fully qualified name will be generated
12269 -- for the elaboration subprogram).
12271 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
12272 N_Defining_Program_Unit_Name
12274 Set_Scope
(Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
12278 -- Case where instantiation is not a library unit
12281 -- Handle the case of an instance with incomplete actual types.
12282 -- The instance body cannot be placed just after the declaration
12283 -- because full views have not been seen yet. Any use of the non-
12284 -- limited views in the instance body requires the presence of a
12285 -- regular with_clause in the enclosing unit. Therefore we place
12286 -- the instance body at the beginning of the enclosing body, and
12287 -- the freeze node for the instance is then placed after the body.
12289 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
))
12290 and then Ekind
(Scope
(Act_Decl_Id
)) = E_Package
12293 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
12294 Body_Id
: constant Node_Id
:=
12295 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
12300 pragma Assert
(Present
(Body_Id
));
12302 Prepend
(Act_Body
, Declarations
(Parent
(Body_Id
)));
12304 if Expander_Active
then
12305 Ensure_Freeze_Node
(Act_Decl_Id
);
12306 F_Node
:= Freeze_Node
(Act_Decl_Id
);
12307 Set_Is_Frozen
(Act_Decl_Id
, False);
12308 if Is_List_Member
(F_Node
) then
12312 Insert_After
(Act_Body
, F_Node
);
12317 Insert_Before
(Inst_Node
, Act_Body
);
12318 Mark_Rewrite_Insertion
(Act_Body
);
12320 -- Insert the freeze node for the instance if need be
12322 if Expander_Active
then
12323 Freeze_Package_Instance
12324 (Inst_Node
, Gen_Body
, Gen_Decl
, Act_Decl_Id
);
12325 Set_Is_Frozen
(Act_Decl_Id
);
12329 -- If the instantiation appears within a generic child package
12330 -- enable visibility of current instance of enclosing generic
12333 if Present
(Ctx_Parents
) then
12334 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= False;
12335 Analyze
(Act_Body
);
12336 Scope_Stack
.Table
(Ctx_Top
).Is_Active_Stack_Base
:= True;
12338 Analyze
(Act_Body
);
12342 Inherit_Context
(Gen_Body
, Inst_Node
);
12344 if Par_Installed
then
12345 Remove_Parent
(In_Body
=> True);
12347 -- Restore the previous visibility of the parent
12349 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12352 -- Remove the parent instances if they have been placed on the scope
12353 -- stack to compile the body.
12355 if Present
(Ctx_Parents
) then
12356 pragma Assert
(Scope_Stack
.Last
= Ctx_Top
12357 and then Current_Scope
= Standard_Standard
);
12360 Remove_Parents_Of_Generic_Context
(Ctx_Parents
);
12363 pragma Assert
(Current_Scope
= Scope_Check_Id
);
12364 pragma Assert
(Scope_Stack
.Last
= Scope_Check_Last
);
12366 Restore_Hidden_Primitives
(Vis_Prims_List
);
12368 -- Restore the private views that were made visible when the body of
12369 -- the instantiation was created. Note that, in the case where one of
12370 -- these private views is declared in the parent, there is a nesting
12371 -- issue with the calls to Install_Parent and Remove_Parent made in
12372 -- between above with In_Body set to True, because these calls also
12373 -- want to swap and restore this private view respectively. In this
12374 -- case, the call to Install_Parent does nothing, but the call to
12375 -- Remove_Parent does restore the private view, thus undercutting the
12376 -- call to Restore_Private_Views. That's OK under the condition that
12377 -- the two mechanisms swap exactly the same entities, in particular
12378 -- the private entities dependent on the primary private entities.
12380 Restore_Private_Views
(Act_Decl_Id
);
12382 -- Remove the current unit from visibility if this is an instance
12383 -- that is not elaborated on the fly for inlining purposes.
12385 if not Inlined_Body
then
12386 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
12391 -- If we have no body, and the unit requires a body, then complain. This
12392 -- complaint is suppressed if we have detected other errors (since a
12393 -- common reason for missing the body is that it had errors).
12394 -- In CodePeer mode, a warning has been emitted already, no need for
12395 -- further messages.
12397 elsif Unit_Requires_Body
(Gen_Unit
)
12398 and then not Body_Optional
12400 if CodePeer_Mode
then
12403 elsif Serious_Errors_Detected
= 0 then
12405 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
12407 -- Don't attempt to perform any cleanup actions if some other error
12408 -- was already detected, since this can cause blowups.
12414 -- Case of package that does not need a body
12417 -- If the instantiation of the declaration is a library unit, rewrite
12418 -- the original package instantiation as a package declaration in the
12419 -- compilation unit node.
12421 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12422 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
12423 Rewrite
(Inst_Node
, Act_Decl
);
12425 -- Generate elaboration entity, in case spec has elaboration code.
12426 -- This cannot be done when the instance is analyzed, because it
12427 -- is not known yet whether the body exists.
12429 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
12430 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
12432 -- If the instantiation is not a library unit, then append the
12433 -- declaration to the list of implicitly generated entities, unless
12434 -- it is already a list member which means that it was already
12437 elsif not Is_List_Member
(Act_Decl
) then
12438 Mark_Rewrite_Insertion
(Act_Decl
);
12439 Insert_Before
(Inst_Node
, Act_Decl
);
12445 -- Restore the context that was in effect prior to instantiating the
12448 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12449 Local_Suppress_Stack_Top
:= Saved_LSST
;
12450 Scope_Suppress
:= Saved_SS
;
12451 Style_Check
:= Saved_SC
;
12453 Expander_Mode_Restore
;
12454 Restore_Config_Switches
(Saved_CS
);
12455 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12456 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12457 Restore_Warnings
(Saved_Warn
);
12458 end Instantiate_Package_Body
;
12460 ---------------------------------
12461 -- Instantiate_Subprogram_Body --
12462 ---------------------------------
12464 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
12465 -- must be replaced by gotos which jump to the end of the routine in order
12466 -- to restore the Ghost and SPARK modes.
12468 procedure Instantiate_Subprogram_Body
12469 (Body_Info
: Pending_Body_Info
;
12470 Body_Optional
: Boolean := False)
12472 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
12473 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
12474 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
12475 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
12476 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
12477 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
12478 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
12479 Pack_Id
: constant Entity_Id
:=
12480 Defining_Unit_Name
(Parent
(Act_Decl
));
12482 -- The following constants capture the context prior to instantiating
12483 -- the subprogram body.
12485 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
12486 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
12487 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
12488 Saved_ISMP
: constant Boolean :=
12489 Ignore_SPARK_Mode_Pragmas_In_Instance
;
12490 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
12491 Local_Suppress_Stack_Top
;
12492 Saved_SC
: constant Boolean := Style_Check
;
12493 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
12494 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
12495 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
12496 Saved_Warn
: constant Warning_Record
:= Save_Warnings
;
12498 Act_Body
: Node_Id
;
12499 Act_Body_Id
: Entity_Id
;
12500 Gen_Body
: Node_Id
;
12501 Gen_Body_Id
: Node_Id
;
12502 Pack_Body
: Node_Id
;
12503 Par_Ent
: Entity_Id
:= Empty
;
12504 Par_Installed
: Boolean := False;
12505 Par_Vis
: Boolean := False;
12506 Ret_Expr
: Node_Id
;
12509 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12511 -- Subprogram body may have been created already because of an inline
12512 -- pragma, or because of multiple elaborations of the enclosing package
12513 -- when several instances of the subprogram appear in the main unit.
12515 if Present
(Corresponding_Body
(Act_Decl
)) then
12519 -- The subprogram being instantiated may be subject to pragma Ghost. Set
12520 -- the mode now to ensure that any nodes generated during instantiation
12521 -- are properly marked as Ghost.
12523 Set_Ghost_Mode
(Act_Decl_Id
);
12525 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
12527 -- Re-establish the state of information on which checks are suppressed.
12528 -- This information was set in Body_Info at the point of instantiation,
12529 -- and now we restore it so that the instance is compiled using the
12530 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
12532 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
12533 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
12535 Restore_Config_Switches
(Body_Info
.Config_Switches
);
12536 Restore_Warnings
(Body_Info
.Warnings
);
12538 if No
(Gen_Body_Id
) then
12540 -- For imported generic subprogram, no body to compile, complete
12541 -- the spec entity appropriately.
12543 if Is_Imported
(Gen_Unit
) then
12544 Set_Is_Imported
(Act_Decl_Id
);
12545 Set_First_Rep_Item
(Act_Decl_Id
, First_Rep_Item
(Gen_Unit
));
12546 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
12547 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
12548 Set_Has_Completion
(Act_Decl_Id
);
12551 -- For other cases, compile the body
12554 Load_Parent_Of_Generic
12555 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
12556 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
12560 Instantiation_Node
:= Inst_Node
;
12562 if Present
(Gen_Body_Id
) then
12563 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
12565 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
12567 -- Either body is not present, or context is non-expanding, as
12568 -- when compiling a subunit. Mark the instance as completed, and
12569 -- diagnose a missing body when needed.
12572 and then Operating_Mode
= Generate_Code
12574 Error_Msg_N
("missing proper body for instantiation", Gen_Body
);
12577 Set_Has_Completion
(Act_Decl_Id
);
12581 Save_Env
(Gen_Unit
, Act_Decl_Id
);
12582 Style_Check
:= False;
12584 -- If the context of the instance is subject to SPARK_Mode "off", the
12585 -- annotation is missing, or the body is instantiated at a later pass
12586 -- and its spec ignored SPARK_Mode pragma, set the global flag which
12587 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
12590 if SPARK_Mode
/= On
12591 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
12593 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
12596 -- If the context of an instance is not subject to SPARK_Mode "off",
12597 -- and the generic body is subject to an explicit SPARK_Mode pragma,
12598 -- the latter should be the one applicable to the instance.
12600 if not Ignore_SPARK_Mode_Pragmas_In_Instance
12601 and then SPARK_Mode
/= Off
12602 and then Present
(SPARK_Pragma
(Gen_Body_Id
))
12604 Set_SPARK_Mode
(Gen_Body_Id
);
12607 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
12608 Create_Instantiation_Source
12615 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
12617 -- Create proper defining name for the body, to correspond to the one
12621 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
12623 Preserve_Comes_From_Source
(Act_Body_Id
, Act_Decl_Id
);
12624 Set_Defining_Unit_Name
(Specification
(Act_Body
), Act_Body_Id
);
12626 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
12627 Set_Has_Completion
(Act_Decl_Id
);
12628 Check_Generic_Actuals
(Pack_Id
, False);
12630 -- Generate a reference to link the visible subprogram instance to
12631 -- the generic body, which for navigation purposes is the only
12632 -- available source for the instance.
12635 (Related_Instance
(Pack_Id
),
12636 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
12638 -- If it is a child unit, make the parent instance (which is an
12639 -- instance of the parent of the generic) visible. The parent
12640 -- instance is the prefix of the name of the generic unit.
12642 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
12643 and then Nkind
(Gen_Id
) = N_Expanded_Name
12645 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
12646 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12647 Install_Parent
(Par_Ent
, In_Body
=> True);
12648 Par_Installed
:= True;
12650 elsif Is_Child_Unit
(Gen_Unit
) then
12651 Par_Ent
:= Scope
(Gen_Unit
);
12652 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
12653 Install_Parent
(Par_Ent
, In_Body
=> True);
12654 Par_Installed
:= True;
12657 -- Subprogram body is placed in the body of wrapper package,
12658 -- whose spec contains the subprogram declaration as well as
12659 -- the renaming declarations for the generic parameters.
12662 Make_Package_Body
(Loc
,
12663 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12664 Declarations
=> New_List
(Act_Body
));
12666 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12668 -- If the instantiation is a library unit, then build resulting
12669 -- compilation unit nodes for the instance. The declaration of
12670 -- the enclosing package is the grandparent of the subprogram
12671 -- declaration. First replace the instantiation node as the unit
12672 -- of the corresponding compilation.
12674 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
12675 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
12676 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
12677 Build_Instance_Compilation_Unit_Nodes
12678 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
12679 Analyze
(Inst_Node
);
12681 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
12682 Analyze
(Pack_Body
);
12686 Insert_Before
(Inst_Node
, Pack_Body
);
12687 Mark_Rewrite_Insertion
(Pack_Body
);
12689 -- Insert the freeze node for the instance if need be
12691 if Expander_Active
then
12692 Freeze_Subprogram_Instance
(Inst_Node
, Gen_Body
, Pack_Id
);
12695 Analyze
(Pack_Body
);
12698 Inherit_Context
(Gen_Body
, Inst_Node
);
12700 Restore_Private_Views
(Pack_Id
, False);
12702 if Par_Installed
then
12703 Remove_Parent
(In_Body
=> True);
12705 -- Restore the previous visibility of the parent
12707 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
12712 -- Body not found. Error was emitted already. If there were no previous
12713 -- errors, this may be an instance whose scope is a premature instance.
12714 -- In that case we must insure that the (legal) program does raise
12715 -- program error if executed. We generate a subprogram body for this
12718 elsif Serious_Errors_Detected
= 0
12719 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
12721 if Body_Optional
then
12724 elsif Ekind
(Act_Decl_Id
) = E_Procedure
then
12726 Make_Subprogram_Body
(Loc
,
12728 Make_Procedure_Specification
(Loc
,
12729 Defining_Unit_Name
=>
12730 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12731 Parameter_Specifications
=>
12733 (Parameter_Specifications
(Parent
(Act_Decl_Id
)))),
12735 Declarations
=> Empty_List
,
12736 Handled_Statement_Sequence
=>
12737 Make_Handled_Sequence_Of_Statements
(Loc
,
12738 Statements
=> New_List
(
12739 Make_Raise_Program_Error
(Loc
,
12740 Reason
=> PE_Access_Before_Elaboration
))));
12744 Make_Raise_Program_Error
(Loc
,
12745 Reason
=> PE_Access_Before_Elaboration
);
12747 Set_Etype
(Ret_Expr
, (Etype
(Act_Decl_Id
)));
12748 Set_Analyzed
(Ret_Expr
);
12751 Make_Subprogram_Body
(Loc
,
12753 Make_Function_Specification
(Loc
,
12754 Defining_Unit_Name
=>
12755 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12756 Parameter_Specifications
=>
12758 (Parameter_Specifications
(Parent
(Act_Decl_Id
))),
12759 Result_Definition
=>
12760 New_Occurrence_Of
(Etype
(Act_Decl_Id
), Loc
)),
12762 Declarations
=> Empty_List
,
12763 Handled_Statement_Sequence
=>
12764 Make_Handled_Sequence_Of_Statements
(Loc
,
12765 Statements
=> New_List
(
12766 Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
12770 Make_Package_Body
(Loc
,
12771 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12772 Declarations
=> New_List
(Act_Body
));
12774 Insert_After
(Inst_Node
, Pack_Body
);
12775 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12776 Analyze
(Pack_Body
);
12781 -- Restore the context that was in effect prior to instantiating the
12782 -- subprogram body.
12784 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12785 Local_Suppress_Stack_Top
:= Saved_LSST
;
12786 Scope_Suppress
:= Saved_SS
;
12787 Style_Check
:= Saved_SC
;
12789 Expander_Mode_Restore
;
12790 Restore_Config_Switches
(Saved_CS
);
12791 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12792 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12793 Restore_Warnings
(Saved_Warn
);
12794 end Instantiate_Subprogram_Body
;
12796 ----------------------
12797 -- Instantiate_Type --
12798 ----------------------
12800 function Instantiate_Type
12803 Analyzed_Formal
: Node_Id
;
12804 Actual_Decls
: List_Id
) return List_Id
12806 A_Gen_T
: constant Entity_Id
:=
12807 Defining_Identifier
(Analyzed_Formal
);
12808 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
12809 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
12811 Ancestor
: Entity_Id
:= Empty
;
12812 Decl_Node
: Node_Id
;
12813 Decl_Nodes
: List_Id
;
12817 procedure Check_Shared_Variable_Control_Aspects
;
12818 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12819 -- that may be specified for a formal type are obeyed by the actual.
12821 procedure Diagnose_Predicated_Actual
;
12822 -- There are a number of constructs in which a discrete type with
12823 -- predicates is illegal, e.g. as an index in an array type declaration.
12824 -- If a generic type is used is such a construct in a generic package
12825 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
12826 -- of the generic contract that the actual cannot have predicates.
12828 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
12829 -- Check that base types are the same and that the subtypes match
12830 -- statically. Used in several of the validation subprograms for
12831 -- actuals in instantiations.
12833 procedure Validate_Array_Type_Instance
;
12834 procedure Validate_Access_Subprogram_Instance
;
12835 procedure Validate_Access_Type_Instance
;
12836 procedure Validate_Derived_Type_Instance
;
12837 procedure Validate_Derived_Interface_Type_Instance
;
12838 procedure Validate_Discriminated_Formal_Type
;
12839 procedure Validate_Interface_Type_Instance
;
12840 procedure Validate_Private_Type_Instance
;
12841 procedure Validate_Incomplete_Type_Instance
;
12842 -- These procedures perform validation tests for the named case.
12843 -- Validate_Discriminated_Formal_Type is shared by formal private
12844 -- types and Ada 2012 formal incomplete types.
12846 --------------------------------------------
12847 -- Check_Shared_Variable_Control_Aspects --
12848 --------------------------------------------
12850 -- Ada 2022: Verify that shared variable control aspects (RM C.6)
12851 -- that may be specified for the formal are obeyed by the actual.
12852 -- If the formal is a derived type the aspect specifications must match.
12853 -- NOTE: AI12-0282 implies that matching of aspects is required between
12854 -- formal and actual in all cases, but this is too restrictive.
12855 -- In particular it violates a language design rule: a limited private
12856 -- indefinite formal can be matched by any actual. The current code
12857 -- reflects an older and more permissive version of RM C.6 (12/5).
12859 procedure Check_Shared_Variable_Control_Aspects
is
12861 if Ada_Version
>= Ada_2022
then
12862 if Is_Atomic
(A_Gen_T
) and then not Is_Atomic
(Act_T
) then
12864 ("actual for& must have Atomic aspect", Actual
, A_Gen_T
);
12866 elsif Is_Derived_Type
(A_Gen_T
)
12867 and then Is_Atomic
(A_Gen_T
) /= Is_Atomic
(Act_T
)
12870 ("actual for& has different Atomic aspect", Actual
, A_Gen_T
);
12873 if Is_Volatile
(A_Gen_T
) and then not Is_Volatile
(Act_T
) then
12875 ("actual for& must have Volatile aspect",
12878 elsif Is_Derived_Type
(A_Gen_T
)
12879 and then Is_Volatile
(A_Gen_T
) /= Is_Volatile
(Act_T
)
12882 ("actual for& has different Volatile aspect",
12886 -- We assume that an array type whose atomic component type
12887 -- is Atomic is equivalent to an array type with the explicit
12888 -- aspect Has_Atomic_Components. This is a reasonable inference
12889 -- from the intent of AI12-0282, and makes it legal to use an
12890 -- actual that does not have the identical aspect as the formal.
12891 -- Ditto for volatile components.
12894 Actual_Atomic_Comp
: constant Boolean :=
12895 Has_Atomic_Components
(Act_T
)
12896 or else (Is_Array_Type
(Act_T
)
12897 and then Is_Atomic
(Component_Type
(Act_T
)));
12899 if Has_Atomic_Components
(A_Gen_T
) /= Actual_Atomic_Comp
then
12901 ("formal and actual for& must agree on atomic components",
12907 Actual_Volatile_Comp
: constant Boolean :=
12908 Has_Volatile_Components
(Act_T
)
12909 or else (Is_Array_Type
(Act_T
)
12910 and then Is_Volatile
(Component_Type
(Act_T
)));
12912 if Has_Volatile_Components
(A_Gen_T
) /= Actual_Volatile_Comp
12915 ("actual for& must have volatile components",
12920 -- The following two aspects do not require exact matching,
12921 -- but only one-way agreement. See RM C.6.
12923 if Is_Independent
(A_Gen_T
) and then not Is_Independent
(Act_T
)
12926 ("actual for& must have Independent aspect specified",
12930 if Has_Independent_Components
(A_Gen_T
)
12931 and then not Has_Independent_Components
(Act_T
)
12934 ("actual for& must have Independent_Components specified",
12938 -- Check actual/formal compatibility with respect to the four
12939 -- volatility refinement aspects.
12941 Check_Volatility_Compatibility
12943 "actual type", "its corresponding formal type",
12944 Srcpos_Bearer
=> Actual
);
12946 end Check_Shared_Variable_Control_Aspects
;
12948 ---------------------------------
12949 -- Diagnose_Predicated_Actual --
12950 ---------------------------------
12952 procedure Diagnose_Predicated_Actual
is
12954 if No_Predicate_On_Actual
(A_Gen_T
)
12955 and then Has_Predicates
(Act_T
)
12958 ("actual for& cannot be a type with predicate",
12959 Instantiation_Node
, A_Gen_T
);
12961 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
12962 and then Has_Predicates
(Act_T
)
12963 and then not Has_Static_Predicate_Aspect
(Act_T
)
12966 ("actual for& cannot be a type with a dynamic predicate",
12967 Instantiation_Node
, A_Gen_T
);
12969 end Diagnose_Predicated_Actual
;
12971 --------------------
12972 -- Subtypes_Match --
12973 --------------------
12975 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
12976 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
12979 -- Check that the base types, root types (when dealing with class
12980 -- wide types), or designated types (when dealing with anonymous
12981 -- access types) of Gen_T and Act_T are statically matching subtypes.
12983 return ((Base_Type
(T
) = Act_T
12984 or else Base_Type
(T
) = Base_Type
(Act_T
))
12985 and then Subtypes_Statically_Match
(T
, Act_T
))
12987 or else (Is_Class_Wide_Type
(Gen_T
)
12988 and then Is_Class_Wide_Type
(Act_T
)
12989 and then Subtypes_Match
12990 (Get_Instance_Of
(Root_Type
(Gen_T
)),
12991 Root_Type
(Act_T
)))
12993 or else (Is_Anonymous_Access_Type
(Gen_T
)
12994 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
12995 and then Subtypes_Statically_Match
12996 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
12997 end Subtypes_Match
;
12999 -----------------------------------------
13000 -- Validate_Access_Subprogram_Instance --
13001 -----------------------------------------
13003 procedure Validate_Access_Subprogram_Instance
is
13005 if not Is_Access_Type
(Act_T
)
13006 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
13009 ("expect access type in instantiation of &", Actual
, Gen_T
);
13010 Abandon_Instantiation
(Actual
);
13013 -- According to AI05-288, actuals for access_to_subprograms must be
13014 -- subtype conformant with the generic formal. Previous to AI05-288
13015 -- only mode conformance was required.
13017 -- This is a binding interpretation that applies to previous versions
13018 -- of the language, no need to maintain previous weaker checks.
13020 Check_Subtype_Conformant
13021 (Designated_Type
(Act_T
),
13022 Designated_Type
(A_Gen_T
),
13026 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
13027 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
13029 ("protected access type not allowed for formal &",
13033 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
13035 ("expect protected access type for formal &",
13039 -- If the formal has a specified convention (which in most cases
13040 -- will be StdCall) verify that the actual has the same convention.
13042 if Has_Convention_Pragma
(A_Gen_T
)
13043 and then Convention
(A_Gen_T
) /= Convention
(Act_T
)
13045 Error_Msg_Name_1
:= Get_Convention_Name
(Convention
(A_Gen_T
));
13047 ("actual for formal & must have convention %", Actual
, Gen_T
);
13050 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13052 ("non null exclusion of actual and formal & do not match",
13055 end Validate_Access_Subprogram_Instance
;
13057 -----------------------------------
13058 -- Validate_Access_Type_Instance --
13059 -----------------------------------
13061 procedure Validate_Access_Type_Instance
is
13062 Desig_Type
: constant Entity_Id
:=
13063 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
13064 Desig_Act
: Entity_Id
;
13067 if not Is_Access_Type
(Act_T
) then
13069 ("expect access type in instantiation of &", Actual
, Gen_T
);
13070 Abandon_Instantiation
(Actual
);
13073 if Is_Access_Constant
(A_Gen_T
) then
13074 if not Is_Access_Constant
(Act_T
) then
13076 ("actual type must be access-to-constant type", Actual
);
13077 Abandon_Instantiation
(Actual
);
13080 if Is_Access_Constant
(Act_T
) then
13082 ("actual type must be access-to-variable type", Actual
);
13083 Abandon_Instantiation
(Actual
);
13085 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
13086 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
13089 ("actual must be general access type!", Actual
);
13090 Error_Msg_NE
-- CODEFIX
13091 ("\add ALL to }!", Actual
, Act_T
);
13092 Abandon_Instantiation
(Actual
);
13096 -- The designated subtypes, that is to say the subtypes introduced
13097 -- by an access type declaration (and not by a subtype declaration)
13100 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
13102 -- The designated type may have been introduced through a limited_
13103 -- with clause, in which case retrieve the non-limited view. This
13104 -- applies to incomplete types as well as to class-wide types.
13106 if From_Limited_With
(Desig_Act
) then
13107 Desig_Act
:= Available_View
(Desig_Act
);
13110 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
13112 ("designated type of actual does not match that of formal &",
13115 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
13116 Error_Msg_N
("\predicates do not match", Actual
);
13119 Abandon_Instantiation
(Actual
);
13122 -- Ada 2005: null-exclusion indicators of the two types must agree
13124 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
13126 ("non null exclusion of actual and formal & do not match",
13129 end Validate_Access_Type_Instance
;
13131 ----------------------------------
13132 -- Validate_Array_Type_Instance --
13133 ----------------------------------
13135 procedure Validate_Array_Type_Instance
is
13140 function Formal_Dimensions
return Nat
;
13141 -- Count number of dimensions in array type formal
13143 -----------------------
13144 -- Formal_Dimensions --
13145 -----------------------
13147 function Formal_Dimensions
return Nat
is
13152 if Nkind
(Def
) = N_Constrained_Array_Definition
then
13153 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
13155 Index
:= First
(Subtype_Marks
(Def
));
13158 while Present
(Index
) loop
13164 end Formal_Dimensions
;
13166 -- Start of processing for Validate_Array_Type_Instance
13169 if not Is_Array_Type
(Act_T
) then
13171 ("expect array type in instantiation of &", Actual
, Gen_T
);
13172 Abandon_Instantiation
(Actual
);
13174 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
13175 if not (Is_Constrained
(Act_T
)) then
13177 ("expect constrained array in instantiation of &",
13179 Abandon_Instantiation
(Actual
);
13183 if Is_Constrained
(Act_T
) then
13185 ("expect unconstrained array in instantiation of &",
13187 Abandon_Instantiation
(Actual
);
13191 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
13193 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
13194 Abandon_Instantiation
(Actual
);
13197 I1
:= First_Index
(A_Gen_T
);
13198 I2
:= First_Index
(Act_T
);
13199 for J
in 1 .. Formal_Dimensions
loop
13201 -- If the indexes of the actual were given by a subtype_mark,
13202 -- the index was transformed into a range attribute. Retrieve
13203 -- the original type mark for checking.
13205 if Is_Entity_Name
(Original_Node
(I2
)) then
13206 T2
:= Entity
(Original_Node
(I2
));
13211 if not Subtypes_Match
13212 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
13215 ("index types of actual do not match those of formal &",
13217 Abandon_Instantiation
(Actual
);
13224 -- Check matching subtypes. Note that there are complex visibility
13225 -- issues when the generic is a child unit and some aspect of the
13226 -- generic type is declared in a parent unit of the generic. We do
13227 -- the test to handle this special case only after a direct check
13228 -- for static matching has failed. The case where both the component
13229 -- type and the array type are separate formals, and the component
13230 -- type is a private view may also require special checking in
13231 -- Subtypes_Match. Finally, we assume that a child instance where
13232 -- the component type comes from a formal of a parent instance is
13233 -- correct because the generic was correct. A more precise check
13234 -- seems too complex to install???
13237 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
13240 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
13241 Component_Type
(Act_T
))
13243 (not Inside_A_Generic
13244 and then Is_Child_Unit
(Scope
(Component_Type
(A_Gen_T
))))
13249 ("component subtype of actual does not match that of formal &",
13251 Abandon_Instantiation
(Actual
);
13254 if Has_Aliased_Components
(A_Gen_T
)
13255 and then not Has_Aliased_Components
(Act_T
)
13258 ("actual must have aliased components to match formal type &",
13261 end Validate_Array_Type_Instance
;
13263 -----------------------------------------------
13264 -- Validate_Derived_Interface_Type_Instance --
13265 -----------------------------------------------
13267 procedure Validate_Derived_Interface_Type_Instance
is
13268 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
13272 -- First apply interface instance checks
13274 Validate_Interface_Type_Instance
;
13276 -- Verify that immediate parent interface is an ancestor of
13280 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
13283 ("interface actual must include progenitor&", Actual
, Par
);
13286 -- Now verify that the actual includes all other ancestors of
13289 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
13290 while Present
(Elmt
) loop
13291 if not Interface_Present_In_Ancestor
13292 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
13295 ("interface actual must include progenitor&",
13296 Actual
, Node
(Elmt
));
13301 end Validate_Derived_Interface_Type_Instance
;
13303 ------------------------------------
13304 -- Validate_Derived_Type_Instance --
13305 ------------------------------------
13307 procedure Validate_Derived_Type_Instance
is
13308 Actual_Discr
: Entity_Id
;
13309 Ancestor_Discr
: Entity_Id
;
13312 -- Verify that the actual includes the progenitors of the formal,
13313 -- if any. The formal may depend on previous formals and their
13314 -- instance, so we must examine instance of interfaces if present.
13315 -- The actual may be an extension of an interface, in which case
13316 -- it does not appear in the interface list, so this must be
13317 -- checked separately.
13319 if Present
(Interface_List
(Def
)) then
13320 if not Has_Interfaces
(Act_T
) then
13322 ("actual must implement all interfaces of formal&",
13327 Act_Iface_List
: Elist_Id
;
13329 Iface_Ent
: Entity_Id
;
13331 function Instance_Exists
(I
: Entity_Id
) return Boolean;
13332 -- If the interface entity is declared in a generic unit,
13333 -- this can only be legal if we are within an instantiation
13334 -- of a child of that generic. There is currently no
13335 -- mechanism to relate an interface declared within a
13336 -- generic to the corresponding interface in an instance,
13337 -- so we traverse the list of interfaces of the actual,
13338 -- looking for a name match.
13340 ---------------------
13341 -- Instance_Exists --
13342 ---------------------
13344 function Instance_Exists
(I
: Entity_Id
) return Boolean is
13345 Iface_Elmt
: Elmt_Id
;
13348 Iface_Elmt
:= First_Elmt
(Act_Iface_List
);
13349 while Present
(Iface_Elmt
) loop
13350 if Is_Generic_Instance
(Scope
(Node
(Iface_Elmt
)))
13351 and then Chars
(Node
(Iface_Elmt
)) = Chars
(I
)
13356 Next_Elmt
(Iface_Elmt
);
13360 end Instance_Exists
;
13363 Iface
:= First
(Abstract_Interface_List
(A_Gen_T
));
13364 Collect_Interfaces
(Act_T
, Act_Iface_List
);
13366 while Present
(Iface
) loop
13367 Iface_Ent
:= Get_Instance_Of
(Entity
(Iface
));
13369 if Is_Ancestor
(Iface_Ent
, Act_T
)
13370 or else Is_Progenitor
(Iface_Ent
, Act_T
)
13374 elsif Ekind
(Scope
(Iface_Ent
)) = E_Generic_Package
13375 and then Instance_Exists
(Iface_Ent
)
13380 Error_Msg_Name_1
:= Chars
(Act_T
);
13382 ("actual% must implement interface&",
13383 Actual
, Etype
(Iface
));
13392 -- If the parent type in the generic declaration is itself a previous
13393 -- formal type, then it is local to the generic and absent from the
13394 -- analyzed generic definition. In that case the ancestor is the
13395 -- instance of the formal (which must have been instantiated
13396 -- previously), unless the ancestor is itself a formal derived type.
13397 -- In this latter case (which is the subject of Corrigendum 8652/0038
13398 -- (AI-202) the ancestor of the formals is the ancestor of its
13399 -- parent. Otherwise, the analyzed generic carries the parent type.
13400 -- If the parent type is defined in a previous formal package, then
13401 -- the scope of that formal package is that of the generic type
13402 -- itself, and it has already been mapped into the corresponding type
13403 -- in the actual package.
13405 -- Common case: parent type defined outside of the generic
13407 if Is_Entity_Name
(Subtype_Mark
(Def
))
13408 and then Present
(Entity
(Subtype_Mark
(Def
)))
13410 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
13412 -- Check whether parent is defined in a previous formal package
13415 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
13418 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
13420 -- The type may be a local derivation, or a type extension of a
13421 -- previous formal, or of a formal of a parent package.
13423 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
13425 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
13427 -- Check whether the parent is another derived formal type in the
13428 -- same generic unit.
13430 if Etype
(A_Gen_T
) /= A_Gen_T
13431 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13432 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
13433 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
13435 -- Locate ancestor of parent from the subtype declaration
13436 -- created for the actual.
13442 Decl
:= First
(Actual_Decls
);
13443 while Present
(Decl
) loop
13444 if Nkind
(Decl
) = N_Subtype_Declaration
13445 and then Chars
(Defining_Identifier
(Decl
)) =
13446 Chars
(Etype
(A_Gen_T
))
13448 Ancestor
:= Generic_Parent_Type
(Decl
);
13456 pragma Assert
(Present
(Ancestor
));
13458 -- The ancestor itself may be a previous formal that has been
13461 Ancestor
:= Get_Instance_Of
(Ancestor
);
13465 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
13468 -- Check whether parent is a previous formal of the current generic
13470 elsif Is_Derived_Type
(A_Gen_T
)
13471 and then Is_Generic_Type
(Etype
(A_Gen_T
))
13472 and then Scope
(A_Gen_T
) = Scope
(Etype
(A_Gen_T
))
13474 Ancestor
:= Get_Instance_Of
(First_Subtype
(Etype
(A_Gen_T
)));
13476 -- An unusual case: the actual is a type declared in a parent unit,
13477 -- but is not a formal type so there is no instance_of for it.
13478 -- Retrieve it by analyzing the record extension.
13480 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
13481 and then In_Open_Scopes
(Scope
(Act_T
))
13482 and then Is_Generic_Instance
(Scope
(Act_T
))
13484 Analyze
(Subtype_Mark
(Def
));
13485 Ancestor
:= Entity
(Subtype_Mark
(Def
));
13488 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
13491 -- If the formal derived type has pragma Preelaborable_Initialization
13492 -- then the actual type must have preelaborable initialization.
13494 if Known_To_Have_Preelab_Init
(A_Gen_T
)
13495 and then not Has_Preelaborable_Initialization
(Act_T
)
13498 ("actual for & must have preelaborable initialization",
13502 -- Ada 2005 (AI-251)
13504 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
13505 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
13507 ("(Ada 2005) expected type implementing & in instantiation",
13511 -- Finally verify that the (instance of) the ancestor is an ancestor
13514 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
13516 ("expect type derived from & in instantiation",
13517 Actual
, First_Subtype
(Ancestor
));
13518 Abandon_Instantiation
(Actual
);
13521 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
13522 -- that the formal type declaration has been rewritten as a private
13525 if Ada_Version
>= Ada_2005
13526 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
13527 and then Synchronized_Present
(Parent
(A_Gen_T
))
13529 -- The actual must be a synchronized tagged type
13531 if not Is_Tagged_Type
(Act_T
) then
13533 ("actual of synchronized type must be tagged", Actual
);
13534 Abandon_Instantiation
(Actual
);
13536 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
13537 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
13538 N_Derived_Type_Definition
13539 and then not Synchronized_Present
13540 (Type_Definition
(Parent
(Act_T
)))
13543 ("actual of synchronized type must be synchronized", Actual
);
13544 Abandon_Instantiation
(Actual
);
13548 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
13549 -- removes the second instance of the phrase "or allow pass by copy".
13551 -- For Ada 2022, the aspect may be specified explicitly for the
13552 -- formal regardless of whether an ancestor obeys it.
13554 if Is_Atomic
(Act_T
)
13555 and then not Is_Atomic
(Ancestor
)
13556 and then not Is_Atomic
(A_Gen_T
)
13559 ("cannot have atomic actual type for non-atomic formal type",
13562 elsif Is_Volatile
(Act_T
)
13563 and then not Is_Volatile
(Ancestor
)
13564 and then not Is_Volatile
(A_Gen_T
)
13567 ("cannot have volatile actual type for non-volatile formal type",
13571 -- It should not be necessary to check for unknown discriminants on
13572 -- Formal, but for some reason Has_Unknown_Discriminants is false for
13573 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
13574 -- needs fixing. ???
13576 if Is_Definite_Subtype
(A_Gen_T
)
13577 and then not Unknown_Discriminants_Present
(Formal
)
13578 and then not Is_Definite_Subtype
(Act_T
)
13580 Error_Msg_N
("actual subtype must be constrained", Actual
);
13581 Abandon_Instantiation
(Actual
);
13584 if not Unknown_Discriminants_Present
(Formal
) then
13585 if Is_Constrained
(Ancestor
) then
13586 if not Is_Constrained
(Act_T
) then
13587 Error_Msg_N
("actual subtype must be constrained", Actual
);
13588 Abandon_Instantiation
(Actual
);
13591 -- Ancestor is unconstrained, Check if generic formal and actual
13592 -- agree on constrainedness. The check only applies to array types
13593 -- and discriminated types.
13595 elsif Is_Constrained
(Act_T
) then
13596 if Ekind
(Ancestor
) = E_Access_Type
13597 or else (not Is_Constrained
(A_Gen_T
)
13598 and then Is_Composite_Type
(A_Gen_T
))
13600 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
13601 Abandon_Instantiation
(Actual
);
13604 -- A class-wide type is only allowed if the formal has unknown
13607 elsif Is_Class_Wide_Type
(Act_T
)
13608 and then not Has_Unknown_Discriminants
(Ancestor
)
13611 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
13612 Abandon_Instantiation
(Actual
);
13614 -- Otherwise, the formal and actual must have the same number
13615 -- of discriminants and each discriminant of the actual must
13616 -- correspond to a discriminant of the formal.
13618 elsif Has_Discriminants
(Act_T
)
13619 and then not Has_Unknown_Discriminants
(Act_T
)
13620 and then Has_Discriminants
(Ancestor
)
13622 Actual_Discr
:= First_Discriminant
(Act_T
);
13623 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
13624 while Present
(Actual_Discr
)
13625 and then Present
(Ancestor_Discr
)
13627 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
13628 No
(Corresponding_Discriminant
(Actual_Discr
))
13631 ("discriminant & does not correspond "
13632 & "to ancestor discriminant", Actual
, Actual_Discr
);
13633 Abandon_Instantiation
(Actual
);
13636 Next_Discriminant
(Actual_Discr
);
13637 Next_Discriminant
(Ancestor_Discr
);
13640 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
13642 ("actual for & must have same number of discriminants",
13644 Abandon_Instantiation
(Actual
);
13647 -- This case should be caught by the earlier check for
13648 -- constrainedness, but the check here is added for completeness.
13650 elsif Has_Discriminants
(Act_T
)
13651 and then not Has_Unknown_Discriminants
(Act_T
)
13654 ("actual for & must not have discriminants", Actual
, Gen_T
);
13655 Abandon_Instantiation
(Actual
);
13657 elsif Has_Discriminants
(Ancestor
) then
13659 ("actual for & must have known discriminants", Actual
, Gen_T
);
13660 Abandon_Instantiation
(Actual
);
13663 if not Subtypes_Statically_Compatible
13664 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
13667 ("actual for & must be statically compatible with ancestor",
13670 if not Predicates_Compatible
(Act_T
, Ancestor
) then
13672 ("\predicate on actual is not compatible with ancestor",
13676 Abandon_Instantiation
(Actual
);
13680 -- If the formal and actual types are abstract, check that there
13681 -- are no abstract primitives of the actual type that correspond to
13682 -- nonabstract primitives of the formal type (second sentence of
13685 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
13686 Check_Abstract_Primitives
: declare
13687 Gen_Prims
: constant Elist_Id
:=
13688 Primitive_Operations
(A_Gen_T
);
13689 Gen_Elmt
: Elmt_Id
;
13690 Gen_Subp
: Entity_Id
;
13691 Anc_Subp
: Entity_Id
;
13692 Anc_Formal
: Entity_Id
;
13693 Anc_F_Type
: Entity_Id
;
13695 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
13696 Act_Elmt
: Elmt_Id
;
13697 Act_Subp
: Entity_Id
;
13698 Act_Formal
: Entity_Id
;
13699 Act_F_Type
: Entity_Id
;
13701 Subprograms_Correspond
: Boolean;
13703 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
13704 -- Returns true if T2 is derived directly or indirectly from
13705 -- T1, including derivations from interfaces. T1 and T2 are
13706 -- required to be specific tagged base types.
13708 ------------------------
13709 -- Is_Tagged_Ancestor --
13710 ------------------------
13712 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
13714 Intfc_Elmt
: Elmt_Id
;
13717 -- The predicate is satisfied if the types are the same
13722 -- If we've reached the top of the derivation chain then
13723 -- we know that T1 is not an ancestor of T2.
13725 elsif Etype
(T2
) = T2
then
13728 -- Proceed to check T2's immediate parent
13730 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
13733 -- Finally, check to see if T1 is an ancestor of any of T2's
13737 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
13738 while Present
(Intfc_Elmt
) loop
13739 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
13743 Next_Elmt
(Intfc_Elmt
);
13748 end Is_Tagged_Ancestor
;
13750 -- Start of processing for Check_Abstract_Primitives
13753 -- Loop over all of the formal derived type's primitives
13755 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
13756 while Present
(Gen_Elmt
) loop
13757 Gen_Subp
:= Node
(Gen_Elmt
);
13759 -- If the primitive of the formal is not abstract, then
13760 -- determine whether there is a corresponding primitive of
13761 -- the actual type that's abstract.
13763 if not Is_Abstract_Subprogram
(Gen_Subp
) then
13764 Act_Elmt
:= First_Elmt
(Act_Prims
);
13765 while Present
(Act_Elmt
) loop
13766 Act_Subp
:= Node
(Act_Elmt
);
13768 -- If we find an abstract primitive of the actual,
13769 -- then we need to test whether it corresponds to the
13770 -- subprogram from which the generic formal primitive
13773 if Is_Abstract_Subprogram
(Act_Subp
) then
13774 Anc_Subp
:= Alias
(Gen_Subp
);
13776 -- Test whether we have a corresponding primitive
13777 -- by comparing names, kinds, formal types, and
13780 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
13781 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
13783 Anc_Formal
:= First_Formal
(Anc_Subp
);
13784 Act_Formal
:= First_Formal
(Act_Subp
);
13785 while Present
(Anc_Formal
)
13786 and then Present
(Act_Formal
)
13788 Anc_F_Type
:= Etype
(Anc_Formal
);
13789 Act_F_Type
:= Etype
(Act_Formal
);
13791 if Ekind
(Anc_F_Type
) =
13792 E_Anonymous_Access_Type
13794 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
13796 if Ekind
(Act_F_Type
) =
13797 E_Anonymous_Access_Type
13800 Designated_Type
(Act_F_Type
);
13806 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
13811 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13812 Act_F_Type
:= Base_Type
(Act_F_Type
);
13814 -- If the formal is controlling, then the
13815 -- the type of the actual primitive's formal
13816 -- must be derived directly or indirectly
13817 -- from the type of the ancestor primitive's
13820 if Is_Controlling_Formal
(Anc_Formal
) then
13821 if not Is_Tagged_Ancestor
13822 (Anc_F_Type
, Act_F_Type
)
13827 -- Otherwise the types of the formals must
13830 elsif Anc_F_Type
/= Act_F_Type
then
13834 Next_Formal
(Anc_Formal
);
13835 Next_Formal
(Act_Formal
);
13838 -- If we traversed through all of the formals
13839 -- then so far the subprograms correspond, so
13840 -- now check that any result types correspond.
13842 if No
(Anc_Formal
) and then No
(Act_Formal
) then
13843 Subprograms_Correspond
:= True;
13845 if Ekind
(Act_Subp
) = E_Function
then
13846 Anc_F_Type
:= Etype
(Anc_Subp
);
13847 Act_F_Type
:= Etype
(Act_Subp
);
13849 if Ekind
(Anc_F_Type
) =
13850 E_Anonymous_Access_Type
13853 Designated_Type
(Anc_F_Type
);
13855 if Ekind
(Act_F_Type
) =
13856 E_Anonymous_Access_Type
13859 Designated_Type
(Act_F_Type
);
13861 Subprograms_Correspond
:= False;
13866 = E_Anonymous_Access_Type
13868 Subprograms_Correspond
:= False;
13871 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13872 Act_F_Type
:= Base_Type
(Act_F_Type
);
13874 -- Now either the result types must be
13875 -- the same or, if the result type is
13876 -- controlling, the result type of the
13877 -- actual primitive must descend from the
13878 -- result type of the ancestor primitive.
13880 if Subprograms_Correspond
13881 and then Anc_F_Type
/= Act_F_Type
13883 Has_Controlling_Result
(Anc_Subp
)
13884 and then not Is_Tagged_Ancestor
13885 (Anc_F_Type
, Act_F_Type
)
13887 Subprograms_Correspond
:= False;
13891 -- Found a matching subprogram belonging to
13892 -- formal ancestor type, so actual subprogram
13893 -- corresponds and this violates 3.9.3(9).
13895 if Subprograms_Correspond
then
13897 ("abstract subprogram & overrides "
13898 & "nonabstract subprogram of ancestor",
13905 Next_Elmt
(Act_Elmt
);
13909 Next_Elmt
(Gen_Elmt
);
13911 end Check_Abstract_Primitives
;
13914 -- Verify that limitedness matches. If parent is a limited
13915 -- interface then the generic formal is not unless declared
13916 -- explicitly so. If not declared limited, the actual cannot be
13917 -- limited (see AI05-0087).
13919 if Is_Limited_Type
(Act_T
) and then not Is_Limited_Type
(A_Gen_T
) then
13920 if not In_Instance
then
13922 ("actual for non-limited & cannot be a limited type",
13924 Explain_Limited_Type
(Act_T
, Actual
);
13925 Abandon_Instantiation
(Actual
);
13929 -- Check for AI12-0036
13932 Formal_Is_Private_Extension
: constant Boolean :=
13933 Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
;
13935 Actual_Is_Tagged
: constant Boolean := Is_Tagged_Type
(Act_T
);
13938 if Actual_Is_Tagged
/= Formal_Is_Private_Extension
then
13939 if not In_Instance
then
13940 if Actual_Is_Tagged
then
13942 ("actual for & cannot be a tagged type", Actual
, Gen_T
);
13945 ("actual for & must be a tagged type", Actual
, Gen_T
);
13948 Abandon_Instantiation
(Actual
);
13952 end Validate_Derived_Type_Instance
;
13954 ----------------------------------------
13955 -- Validate_Discriminated_Formal_Type --
13956 ----------------------------------------
13958 procedure Validate_Discriminated_Formal_Type
is
13959 Formal_Discr
: Entity_Id
;
13960 Actual_Discr
: Entity_Id
;
13961 Formal_Subt
: Entity_Id
;
13964 if Has_Discriminants
(A_Gen_T
) then
13965 if not Has_Discriminants
(Act_T
) then
13967 ("actual for & must have discriminants", Actual
, Gen_T
);
13968 Abandon_Instantiation
(Actual
);
13970 elsif Is_Constrained
(Act_T
) then
13972 ("actual for & must be unconstrained", Actual
, Gen_T
);
13973 Abandon_Instantiation
(Actual
);
13976 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
13977 Actual_Discr
:= First_Discriminant
(Act_T
);
13978 while Formal_Discr
/= Empty
loop
13979 if Actual_Discr
= Empty
then
13981 ("discriminants on actual do not match formal",
13983 Abandon_Instantiation
(Actual
);
13986 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
13988 -- Access discriminants match if designated types do
13990 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
13991 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
13992 E_Anonymous_Access_Type
13995 (Designated_Type
(Base_Type
(Formal_Subt
))) =
13996 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
14000 elsif Base_Type
(Formal_Subt
) /=
14001 Base_Type
(Etype
(Actual_Discr
))
14004 ("types of actual discriminants must match formal",
14006 Abandon_Instantiation
(Actual
);
14008 elsif not Subtypes_Statically_Match
14009 (Formal_Subt
, Etype
(Actual_Discr
))
14010 and then Ada_Version
>= Ada_95
14013 ("subtypes of actual discriminants must match formal",
14015 Abandon_Instantiation
(Actual
);
14018 Next_Discriminant
(Formal_Discr
);
14019 Next_Discriminant
(Actual_Discr
);
14022 if Actual_Discr
/= Empty
then
14024 ("discriminants on actual do not match formal",
14026 Abandon_Instantiation
(Actual
);
14030 end Validate_Discriminated_Formal_Type
;
14032 ---------------------------------------
14033 -- Validate_Incomplete_Type_Instance --
14034 ---------------------------------------
14036 procedure Validate_Incomplete_Type_Instance
is
14038 if not Is_Tagged_Type
(Act_T
)
14039 and then Is_Tagged_Type
(A_Gen_T
)
14042 ("actual for & must be a tagged type", Actual
, Gen_T
);
14045 Validate_Discriminated_Formal_Type
;
14046 end Validate_Incomplete_Type_Instance
;
14048 --------------------------------------
14049 -- Validate_Interface_Type_Instance --
14050 --------------------------------------
14052 procedure Validate_Interface_Type_Instance
is
14054 if not Is_Interface
(Act_T
) then
14056 ("actual for formal interface type must be an interface",
14059 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
14060 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
14061 or else Is_Protected_Interface
(A_Gen_T
) /=
14062 Is_Protected_Interface
(Act_T
)
14063 or else Is_Synchronized_Interface
(A_Gen_T
) /=
14064 Is_Synchronized_Interface
(Act_T
)
14067 ("actual for interface& does not match (RM 12.5.5(4))",
14070 end Validate_Interface_Type_Instance
;
14072 ------------------------------------
14073 -- Validate_Private_Type_Instance --
14074 ------------------------------------
14076 procedure Validate_Private_Type_Instance
is
14078 if Is_Limited_Type
(Act_T
)
14079 and then not Is_Limited_Type
(A_Gen_T
)
14081 if In_Instance
then
14085 ("actual for non-limited & cannot be a limited type", Actual
,
14087 Explain_Limited_Type
(Act_T
, Actual
);
14088 Abandon_Instantiation
(Actual
);
14091 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
14092 and then not Has_Preelaborable_Initialization
(Act_T
)
14095 ("actual for & must have preelaborable initialization", Actual
,
14098 elsif not Is_Definite_Subtype
(Act_T
)
14099 and then Is_Definite_Subtype
(A_Gen_T
)
14100 and then Ada_Version
>= Ada_95
14103 ("actual for & must be a definite subtype", Actual
, Gen_T
);
14105 elsif not Is_Tagged_Type
(Act_T
)
14106 and then Is_Tagged_Type
(A_Gen_T
)
14109 ("actual for & must be a tagged type", Actual
, Gen_T
);
14112 Validate_Discriminated_Formal_Type
;
14114 end Validate_Private_Type_Instance
;
14116 -- Start of processing for Instantiate_Type
14119 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
14120 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
14121 return New_List
(Error
);
14123 elsif not Is_Entity_Name
(Actual
)
14124 or else not Is_Type
(Entity
(Actual
))
14127 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
14128 Abandon_Instantiation
(Actual
);
14131 Act_T
:= Entity
(Actual
);
14133 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
14134 -- as a generic actual parameter if the corresponding formal type
14135 -- does not have a known_discriminant_part, or is a formal derived
14136 -- type that is an Unchecked_Union type.
14138 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
14139 if not Has_Discriminants
(A_Gen_T
)
14140 or else (Is_Derived_Type
(A_Gen_T
)
14141 and then Is_Unchecked_Union
(A_Gen_T
))
14145 Error_Msg_N
("unchecked union cannot be the actual for a "
14146 & "discriminated formal type", Act_T
);
14151 -- Deal with fixed/floating restrictions
14153 if Is_Floating_Point_Type
(Act_T
) then
14154 Check_Restriction
(No_Floating_Point
, Actual
);
14155 elsif Is_Fixed_Point_Type
(Act_T
) then
14156 Check_Restriction
(No_Fixed_Point
, Actual
);
14159 -- Deal with error of using incomplete type as generic actual.
14160 -- This includes limited views of a type, even if the non-limited
14161 -- view may be available.
14163 if Ekind
(Act_T
) = E_Incomplete_Type
14164 or else (Is_Class_Wide_Type
(Act_T
)
14165 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
14167 -- If the formal is an incomplete type, the actual can be
14168 -- incomplete as well, but if an actual incomplete type has
14169 -- a full view, then we'll retrieve that.
14171 if Ekind
(A_Gen_T
) = E_Incomplete_Type
14172 and then not Present
(Full_View
(Act_T
))
14176 elsif Is_Class_Wide_Type
(Act_T
)
14177 or else No
(Full_View
(Act_T
))
14179 Error_Msg_N
("premature use of incomplete type", Actual
);
14180 Abandon_Instantiation
(Actual
);
14183 Act_T
:= Full_View
(Act_T
);
14184 Set_Entity
(Actual
, Act_T
);
14186 if Has_Private_Component
(Act_T
) then
14188 ("premature use of type with private component", Actual
);
14192 -- Deal with error of premature use of private type as generic actual
14194 elsif Is_Private_Type
(Act_T
)
14195 and then Is_Private_Type
(Base_Type
(Act_T
))
14196 and then not Is_Generic_Type
(Act_T
)
14197 and then not Is_Derived_Type
(Act_T
)
14198 and then No
(Full_View
(Root_Type
(Act_T
)))
14200 -- If the formal is an incomplete type, the actual can be
14201 -- private or incomplete as well.
14203 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
14206 Error_Msg_N
("premature use of private type", Actual
);
14209 elsif Has_Private_Component
(Act_T
) then
14211 ("premature use of type with private component", Actual
);
14214 Set_Instance_Of
(A_Gen_T
, Act_T
);
14216 -- If the type is generic, the class-wide type may also be used
14218 if Is_Tagged_Type
(A_Gen_T
)
14219 and then Is_Tagged_Type
(Act_T
)
14220 and then not Is_Class_Wide_Type
(A_Gen_T
)
14222 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
14223 Class_Wide_Type
(Act_T
));
14226 if not Is_Abstract_Type
(A_Gen_T
)
14227 and then Is_Abstract_Type
(Act_T
)
14230 ("actual of non-abstract formal cannot be abstract", Actual
);
14233 -- A generic scalar type is a first subtype for which we generate
14234 -- an anonymous base type. Indicate that the instance of this base
14235 -- is the base type of the actual.
14237 if Is_Scalar_Type
(A_Gen_T
) then
14238 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
14242 Check_Shared_Variable_Control_Aspects
;
14244 if Error_Posted
(Act_T
) then
14247 case Nkind
(Def
) is
14248 when N_Formal_Private_Type_Definition
=>
14249 Validate_Private_Type_Instance
;
14251 when N_Formal_Incomplete_Type_Definition
=>
14252 Validate_Incomplete_Type_Instance
;
14254 when N_Formal_Derived_Type_Definition
=>
14255 Validate_Derived_Type_Instance
;
14257 when N_Formal_Discrete_Type_Definition
=>
14258 if not Is_Discrete_Type
(Act_T
) then
14260 ("expect discrete type in instantiation of&",
14262 Abandon_Instantiation
(Actual
);
14265 Diagnose_Predicated_Actual
;
14267 when N_Formal_Signed_Integer_Type_Definition
=>
14268 if not Is_Signed_Integer_Type
(Act_T
) then
14270 ("expect signed integer type in instantiation of&",
14272 Abandon_Instantiation
(Actual
);
14275 Diagnose_Predicated_Actual
;
14277 when N_Formal_Modular_Type_Definition
=>
14278 if not Is_Modular_Integer_Type
(Act_T
) then
14280 ("expect modular type in instantiation of &",
14282 Abandon_Instantiation
(Actual
);
14285 Diagnose_Predicated_Actual
;
14287 when N_Formal_Floating_Point_Definition
=>
14288 if not Is_Floating_Point_Type
(Act_T
) then
14290 ("expect float type in instantiation of &", Actual
, Gen_T
);
14291 Abandon_Instantiation
(Actual
);
14294 when N_Formal_Ordinary_Fixed_Point_Definition
=>
14295 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
14297 ("expect ordinary fixed point type in instantiation of &",
14299 Abandon_Instantiation
(Actual
);
14302 when N_Formal_Decimal_Fixed_Point_Definition
=>
14303 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
14305 ("expect decimal type in instantiation of &",
14307 Abandon_Instantiation
(Actual
);
14310 when N_Array_Type_Definition
=>
14311 Validate_Array_Type_Instance
;
14313 when N_Access_To_Object_Definition
=>
14314 Validate_Access_Type_Instance
;
14316 when N_Access_Function_Definition
14317 | N_Access_Procedure_Definition
14319 Validate_Access_Subprogram_Instance
;
14321 when N_Record_Definition
=>
14322 Validate_Interface_Type_Instance
;
14324 when N_Derived_Type_Definition
=>
14325 Validate_Derived_Interface_Type_Instance
;
14328 raise Program_Error
;
14332 Subt
:= New_Copy
(Gen_T
);
14334 -- Use adjusted sloc of subtype name as the location for other nodes in
14335 -- the subtype declaration.
14337 Loc
:= Sloc
(Subt
);
14340 Make_Subtype_Declaration
(Loc
,
14341 Defining_Identifier
=> Subt
,
14342 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
14344 -- Record whether the actual is private at this point, so that
14345 -- Check_Generic_Actuals can restore its proper view before the
14346 -- semantic analysis of the instance.
14348 if Is_Private_Type
(Act_T
) then
14349 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
14352 -- In Ada 2012 the actual may be a limited view. Indicate that
14353 -- the local subtype must be treated as such.
14355 if From_Limited_With
(Act_T
) then
14356 Mutate_Ekind
(Subt
, E_Incomplete_Subtype
);
14357 Set_From_Limited_With
(Subt
);
14360 Decl_Nodes
:= New_List
(Decl_Node
);
14362 -- Flag actual derived types so their elaboration produces the
14363 -- appropriate renamings for the primitive operations of the ancestor.
14364 -- Flag actual for formal private types as well, to determine whether
14365 -- operations in the private part may override inherited operations.
14366 -- If the formal has an interface list, the ancestor is not the
14367 -- parent, but the analyzed formal that includes the interface
14368 -- operations of all its progenitors.
14370 -- Same treatment for formal private types, so we can check whether the
14371 -- type is tagged limited when validating derivations in the private
14372 -- part. (See AI05-096).
14374 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
14375 if Present
(Interface_List
(Def
)) then
14376 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14378 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
14381 elsif Nkind
(Def
) in N_Formal_Private_Type_Definition
14382 | N_Formal_Incomplete_Type_Definition
14384 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
14387 -- If the actual is a synchronized type that implements an interface,
14388 -- the primitive operations are attached to the corresponding record,
14389 -- and we have to treat it as an additional generic actual, so that its
14390 -- primitive operations become visible in the instance. The task or
14391 -- protected type itself does not carry primitive operations.
14393 if Is_Concurrent_Type
(Act_T
)
14394 and then Is_Tagged_Type
(Act_T
)
14395 and then Present
(Corresponding_Record_Type
(Act_T
))
14396 and then Present
(Ancestor
)
14397 and then Is_Interface
(Ancestor
)
14400 Corr_Rec
: constant Entity_Id
:=
14401 Corresponding_Record_Type
(Act_T
);
14402 New_Corr
: Entity_Id
;
14403 Corr_Decl
: Node_Id
;
14406 New_Corr
:= Make_Temporary
(Loc
, 'S');
14408 Make_Subtype_Declaration
(Loc
,
14409 Defining_Identifier
=> New_Corr
,
14410 Subtype_Indication
=>
14411 New_Occurrence_Of
(Corr_Rec
, Loc
));
14412 Append_To
(Decl_Nodes
, Corr_Decl
);
14414 if Ekind
(Act_T
) = E_Task_Type
then
14415 Mutate_Ekind
(Subt
, E_Task_Subtype
);
14417 Mutate_Ekind
(Subt
, E_Protected_Subtype
);
14420 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
14421 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
14422 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
14426 -- For a floating-point type, capture dimension info if any, because
14427 -- the generated subtype declaration does not come from source and
14428 -- will not process dimensions.
14430 if Is_Floating_Point_Type
(Act_T
) then
14431 Copy_Dimensions
(Act_T
, Subt
);
14435 end Instantiate_Type
;
14437 ---------------------
14438 -- Is_In_Main_Unit --
14439 ---------------------
14441 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
14442 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
14443 Current_Unit
: Node_Id
;
14446 if Unum
= Main_Unit
then
14449 -- If the current unit is a subunit then it is either the main unit or
14450 -- is being compiled as part of the main unit.
14452 elsif Nkind
(N
) = N_Compilation_Unit
then
14453 return Nkind
(Unit
(N
)) = N_Subunit
;
14456 Current_Unit
:= Parent
(N
);
14457 while Present
(Current_Unit
)
14458 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
14460 Current_Unit
:= Parent
(Current_Unit
);
14463 -- The instantiation node is in the main unit, or else the current node
14464 -- (perhaps as the result of nested instantiations) is in the main unit,
14465 -- or in the declaration of the main unit, which in this last case must
14469 Current_Unit
= Cunit
(Main_Unit
)
14470 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
14471 or else (Present
(Current_Unit
)
14472 and then Present
(Library_Unit
(Current_Unit
))
14473 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
14474 end Is_In_Main_Unit
;
14476 ----------------------------
14477 -- Load_Parent_Of_Generic --
14478 ----------------------------
14480 procedure Load_Parent_Of_Generic
14483 Body_Optional
: Boolean := False)
14485 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
14486 Saved_Style_Check
: constant Boolean := Style_Check
;
14487 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
14488 True_Parent
: Node_Id
;
14489 Inst_Node
: Node_Id
;
14491 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
14493 procedure Collect_Previous_Instances
(Decls
: List_Id
);
14494 -- Collect all instantiations in the given list of declarations, that
14495 -- precede the generic that we need to load. If the bodies of these
14496 -- instantiations are available, we must analyze them, to ensure that
14497 -- the public symbols generated are the same when the unit is compiled
14498 -- to generate code, and when it is compiled in the context of a unit
14499 -- that needs a particular nested instance. This process is applied to
14500 -- both package and subprogram instances.
14502 --------------------------------
14503 -- Collect_Previous_Instances --
14504 --------------------------------
14506 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
14510 Decl
:= First
(Decls
);
14511 while Present
(Decl
) loop
14512 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
14515 -- If Decl is an instantiation, then record it as requiring
14516 -- instantiation of the corresponding body, except if it is an
14517 -- abbreviated instantiation generated internally for conformance
14518 -- checking purposes only for the case of a formal package
14519 -- declared without a box (see Instantiate_Formal_Package). Such
14520 -- an instantiation does not generate any code (the actual code
14521 -- comes from actual) and thus does not need to be analyzed here.
14522 -- If the instantiation appears with a generic package body it is
14523 -- not analyzed here either.
14525 elsif Nkind
(Decl
) = N_Package_Instantiation
14526 and then not Is_Internal
(Defining_Entity
(Decl
))
14528 Append_Elmt
(Decl
, Previous_Instances
);
14530 -- For a subprogram instantiation, omit instantiations intrinsic
14531 -- operations (Unchecked_Conversions, etc.) that have no bodies.
14533 elsif Nkind
(Decl
) in N_Function_Instantiation
14534 | N_Procedure_Instantiation
14535 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
14537 Append_Elmt
(Decl
, Previous_Instances
);
14539 elsif Nkind
(Decl
) = N_Package_Declaration
then
14540 Collect_Previous_Instances
14541 (Visible_Declarations
(Specification
(Decl
)));
14542 Collect_Previous_Instances
14543 (Private_Declarations
(Specification
(Decl
)));
14545 -- Previous non-generic bodies may contain instances as well
14547 elsif Nkind
(Decl
) = N_Package_Body
14548 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
14550 Collect_Previous_Instances
(Declarations
(Decl
));
14552 elsif Nkind
(Decl
) = N_Subprogram_Body
14553 and then not Acts_As_Spec
(Decl
)
14554 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
14556 Collect_Previous_Instances
(Declarations
(Decl
));
14561 end Collect_Previous_Instances
;
14563 -- Start of processing for Load_Parent_Of_Generic
14566 if not In_Same_Source_Unit
(N
, Spec
)
14567 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
14568 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
14569 and then not Is_In_Main_Unit
(Spec
))
14571 -- Find body of parent of spec, and analyze it. A special case arises
14572 -- when the parent is an instantiation, that is to say when we are
14573 -- currently instantiating a nested generic. In that case, there is
14574 -- no separate file for the body of the enclosing instance. Instead,
14575 -- the enclosing body must be instantiated as if it were a pending
14576 -- instantiation, in order to produce the body for the nested generic
14577 -- we require now. Note that in that case the generic may be defined
14578 -- in a package body, the instance defined in the same package body,
14579 -- and the original enclosing body may not be in the main unit.
14581 Inst_Node
:= Empty
;
14583 True_Parent
:= Parent
(Spec
);
14584 while Present
(True_Parent
)
14585 and then Nkind
(True_Parent
) /= N_Compilation_Unit
14587 if Nkind
(True_Parent
) = N_Package_Declaration
14589 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
14591 -- Parent is a compilation unit that is an instantiation, and
14592 -- instantiation node has been replaced with package decl.
14594 Inst_Node
:= Original_Node
(True_Parent
);
14597 elsif Nkind
(True_Parent
) = N_Package_Declaration
14598 and then Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
14600 Nkind
(Unit
(Parent
(True_Parent
))) = N_Package_Instantiation
14602 -- Parent is a compilation unit that is an instantiation, but
14603 -- instantiation node has not been replaced with package decl.
14605 Inst_Node
:= Unit
(Parent
(True_Parent
));
14608 elsif Nkind
(True_Parent
) = N_Package_Declaration
14609 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14610 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
14612 -- Parent is an instantiation within another specification.
14613 -- Declaration for instance has been inserted before original
14614 -- instantiation node. A direct link would be preferable?
14616 Inst_Node
:= Next
(True_Parent
);
14617 while Present
(Inst_Node
)
14618 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
14623 -- If the instance appears within a generic, and the generic
14624 -- unit is defined within a formal package of the enclosing
14625 -- generic, there is no generic body available, and none
14626 -- needed. A more precise test should be used ???
14628 if No
(Inst_Node
) then
14634 -- If an ancestor of the generic comes from a formal package
14635 -- there is no source for the ancestor body. This is detected
14636 -- by examining the scope of the ancestor and its declaration.
14637 -- The body, if any is needed, will be available when the
14638 -- current unit (containing a formal package) is instantiated.
14640 elsif Nkind
(True_Parent
) = N_Package_Specification
14641 and then Present
(Generic_Parent
(True_Parent
))
14643 (Original_Node
(Unit_Declaration_Node
14644 (Scope
(Generic_Parent
(True_Parent
)))))
14645 = N_Formal_Package_Declaration
14650 True_Parent
:= Parent
(True_Parent
);
14654 -- Case where we are currently instantiating a nested generic
14656 if Present
(Inst_Node
) then
14657 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
14659 -- Instantiation node and declaration of instantiated package
14660 -- were exchanged when only the declaration was needed.
14661 -- Restore instantiation node before proceeding with body.
14663 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
14666 -- Now complete instantiation of enclosing body, if it appears in
14667 -- some other unit. If it appears in the current unit, the body
14668 -- will have been instantiated already.
14670 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
14672 -- We need to determine the expander mode to instantiate the
14673 -- enclosing body. Because the generic body we need may use
14674 -- global entities declared in the enclosing package (including
14675 -- aggregates) it is in general necessary to compile this body
14676 -- with expansion enabled, except if we are within a generic
14677 -- package, in which case the usual generic rule applies.
14680 Exp_Status
: Boolean := True;
14684 -- Loop through scopes looking for generic package
14686 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
14687 while Present
(Scop
)
14688 and then Scop
/= Standard_Standard
14690 if Ekind
(Scop
) = E_Generic_Package
then
14691 Exp_Status
:= False;
14695 Scop
:= Scope
(Scop
);
14698 -- Collect previous instantiations in the unit that contains
14699 -- the desired generic.
14701 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
14702 and then not Body_Optional
14706 Info
: Pending_Body_Info
;
14710 Par
:= Parent
(Inst_Node
);
14711 while Present
(Par
) loop
14712 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
14713 Par
:= Parent
(Par
);
14716 pragma Assert
(Present
(Par
));
14718 if Nkind
(Par
) = N_Package_Body
then
14719 Collect_Previous_Instances
(Declarations
(Par
));
14721 elsif Nkind
(Par
) = N_Package_Declaration
then
14722 Collect_Previous_Instances
14723 (Visible_Declarations
(Specification
(Par
)));
14724 Collect_Previous_Instances
14725 (Private_Declarations
(Specification
(Par
)));
14728 -- Enclosing unit is a subprogram body. In this
14729 -- case all instance bodies are processed in order
14730 -- and there is no need to collect them separately.
14735 Decl
:= First_Elmt
(Previous_Instances
);
14736 while Present
(Decl
) loop
14739 Instance_Spec
(Node
(Decl
)),
14740 Config_Switches
=> Save_Config_Switches
,
14741 Current_Sem_Unit
=>
14742 Get_Code_Unit
(Sloc
(Node
(Decl
))),
14743 Expander_Status
=> Exp_Status
,
14744 Inst_Node
=> Node
(Decl
),
14745 Local_Suppress_Stack_Top
=>
14746 Local_Suppress_Stack_Top
,
14747 Scope_Suppress
=> Scope_Suppress
,
14748 Warnings
=> Save_Warnings
);
14750 -- Package instance
14752 if Nkind
(Node
(Decl
)) = N_Package_Instantiation
14754 Instantiate_Package_Body
14755 (Info
, Body_Optional
=> True);
14757 -- Subprogram instance
14760 -- The instance_spec is in the wrapper package,
14761 -- usually followed by its local renaming
14762 -- declaration. See Build_Subprogram_Renaming
14763 -- for details. If the instance carries aspects,
14764 -- these result in the corresponding pragmas,
14765 -- inserted after the subprogram declaration.
14766 -- They must be skipped as well when retrieving
14767 -- the desired spec. Some of them may have been
14768 -- rewritten as null statements.
14769 -- A direct link would be more robust ???
14773 (Last
(Visible_Declarations
14774 (Specification
(Info
.Act_Decl
))));
14776 while Nkind
(Decl
) in
14779 N_Subprogram_Renaming_Declaration
14781 Decl
:= Prev
(Decl
);
14784 Info
.Act_Decl
:= Decl
;
14787 Instantiate_Subprogram_Body
14788 (Info
, Body_Optional
=> True);
14796 Instantiate_Package_Body
14798 ((Act_Decl
=> True_Parent
,
14799 Config_Switches
=> Save_Config_Switches
,
14800 Current_Sem_Unit
=>
14801 Get_Code_Unit
(Sloc
(Inst_Node
)),
14802 Expander_Status
=> Exp_Status
,
14803 Inst_Node
=> Inst_Node
,
14804 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
14805 Scope_Suppress
=> Scope_Suppress
,
14806 Warnings
=> Save_Warnings
)),
14807 Body_Optional
=> Body_Optional
);
14811 -- Case where we are not instantiating a nested generic
14814 Opt
.Style_Check
:= False;
14815 Expander_Mode_Save_And_Set
(True);
14816 Load_Needed_Body
(Comp_Unit
, OK
);
14817 Opt
.Style_Check
:= Saved_Style_Check
;
14818 Restore_Warnings
(Saved_Warnings
);
14819 Expander_Mode_Restore
;
14822 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
14823 and then not Body_Optional
14826 Bname
: constant Unit_Name_Type
:=
14827 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
14830 -- In CodePeer mode, the missing body may make the analysis
14831 -- incomplete, but we do not treat it as fatal.
14833 if CodePeer_Mode
then
14837 Error_Msg_Unit_1
:= Bname
;
14838 Error_Msg_N
("this instantiation requires$!", N
);
14839 Error_Msg_File_1
:=
14840 Get_File_Name
(Bname
, Subunit
=> False);
14841 Error_Msg_N
("\but file{ was not found!", N
);
14842 raise Unrecoverable_Error
;
14849 -- If loading parent of the generic caused an instantiation circularity,
14850 -- we abandon compilation at this point, because otherwise in some cases
14851 -- we get into trouble with infinite recursions after this point.
14853 if Circularity_Detected
then
14854 raise Unrecoverable_Error
;
14856 end Load_Parent_Of_Generic
;
14858 ---------------------------------
14859 -- Map_Formal_Package_Entities --
14860 ---------------------------------
14862 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
14867 Set_Instance_Of
(Form
, Act
);
14869 -- Traverse formal and actual package to map the corresponding entities.
14870 -- We skip over internal entities that may be generated during semantic
14871 -- analysis, and find the matching entities by name, given that they
14872 -- must appear in the same order.
14874 E1
:= First_Entity
(Form
);
14875 E2
:= First_Entity
(Act
);
14876 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
14877 -- Could this test be a single condition??? Seems like it could, and
14878 -- isn't FPE (Form) a constant anyway???
14880 if not Is_Internal
(E1
)
14881 and then Present
(Parent
(E1
))
14882 and then not Is_Class_Wide_Type
(E1
)
14883 and then not Is_Internal_Name
(Chars
(E1
))
14885 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
14892 Set_Instance_Of
(E1
, E2
);
14894 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
14895 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
14898 if Is_Constrained
(E1
) then
14899 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
14902 if Ekind
(E1
) = E_Package
and then No
(Renamed_Entity
(E1
)) then
14903 Map_Formal_Package_Entities
(E1
, E2
);
14910 end Map_Formal_Package_Entities
;
14912 -----------------------
14913 -- Move_Freeze_Nodes --
14914 -----------------------
14916 procedure Move_Freeze_Nodes
14917 (Out_Of
: Entity_Id
;
14922 Next_Decl
: Node_Id
;
14923 Next_Node
: Node_Id
:= After
;
14926 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
14927 -- Check whether entity is declared in a scope external to that of the
14930 -------------------
14931 -- Is_Outer_Type --
14932 -------------------
14934 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
14935 Scop
: Entity_Id
:= Scope
(T
);
14938 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
14942 while Scop
/= Standard_Standard
loop
14943 if Scop
= Out_Of
then
14946 Scop
:= Scope
(Scop
);
14954 -- Start of processing for Move_Freeze_Nodes
14961 -- First remove the freeze nodes that may appear before all other
14965 while Present
(Decl
)
14966 and then Nkind
(Decl
) = N_Freeze_Entity
14967 and then Is_Outer_Type
(Entity
(Decl
))
14969 Decl
:= Remove_Head
(L
);
14970 Insert_After
(Next_Node
, Decl
);
14971 Set_Analyzed
(Decl
, False);
14976 -- Next scan the list of declarations and remove each freeze node that
14977 -- appears ahead of the current node.
14979 while Present
(Decl
) loop
14980 while Present
(Next
(Decl
))
14981 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
14982 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
14984 Next_Decl
:= Remove_Next
(Decl
);
14985 Insert_After
(Next_Node
, Next_Decl
);
14986 Set_Analyzed
(Next_Decl
, False);
14987 Next_Node
:= Next_Decl
;
14990 -- If the declaration is a nested package or concurrent type, then
14991 -- recurse. Nested generic packages will have been processed from the
14994 case Nkind
(Decl
) is
14995 when N_Package_Declaration
=>
14996 Spec
:= Specification
(Decl
);
14998 when N_Task_Type_Declaration
=>
14999 Spec
:= Task_Definition
(Decl
);
15001 when N_Protected_Type_Declaration
=>
15002 Spec
:= Protected_Definition
(Decl
);
15008 if Present
(Spec
) then
15009 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
15010 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
15015 end Move_Freeze_Nodes
;
15021 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
15023 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
15026 ------------------------
15027 -- Preanalyze_Actuals --
15028 ------------------------
15030 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
) is
15031 procedure Perform_Appropriate_Analysis
(N
: Node_Id
);
15032 -- Determine if the actuals we are analyzing come from a generic
15033 -- instantiation that is a library unit and dispatch accordingly.
15035 ----------------------------------
15036 -- Perform_Appropriate_Analysis --
15037 ----------------------------------
15039 procedure Perform_Appropriate_Analysis
(N
: Node_Id
) is
15041 -- When we have a library instantiation we cannot allow any expansion
15042 -- to occur, since there may be no place to put it. Instead, in that
15043 -- case we perform a preanalysis of the actual.
15045 if Present
(Inst
) and then Is_Compilation_Unit
(Inst
) then
15050 end Perform_Appropriate_Analysis
;
15054 Errs
: constant Nat
:= Serious_Errors_Detected
;
15059 Cur
: Entity_Id
:= Empty
;
15060 -- Current homograph of the instance name
15062 Vis
: Boolean := False;
15063 -- Saved visibility status of the current homograph
15065 -- Start of processing for Preanalyze_Actuals
15068 Assoc
:= First
(Generic_Associations
(N
));
15070 -- If the instance is a child unit, its name may hide an outer homonym,
15071 -- so make it invisible to perform name resolution on the actuals.
15073 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
15075 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
15077 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
15079 if Is_Compilation_Unit
(Cur
) then
15080 Vis
:= Is_Immediately_Visible
(Cur
);
15081 Set_Is_Immediately_Visible
(Cur
, False);
15087 while Present
(Assoc
) loop
15088 if Nkind
(Assoc
) /= N_Others_Choice
then
15089 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
15091 -- Within a nested instantiation, a defaulted actual is an empty
15092 -- association, so nothing to analyze. If the subprogram actual
15093 -- is an attribute, analyze prefix only, because actual is not a
15094 -- complete attribute reference.
15096 -- If actual is an allocator, analyze expression only. The full
15097 -- analysis can generate code, and if instance is a compilation
15098 -- unit we have to wait until the package instance is installed
15099 -- to have a proper place to insert this code.
15101 -- String literals may be operators, but at this point we do not
15102 -- know whether the actual is a formal subprogram or a string.
15107 elsif Nkind
(Act
) = N_Attribute_Reference
then
15108 Perform_Appropriate_Analysis
(Prefix
(Act
));
15110 elsif Nkind
(Act
) = N_Explicit_Dereference
then
15111 Perform_Appropriate_Analysis
(Prefix
(Act
));
15113 elsif Nkind
(Act
) = N_Allocator
then
15115 Expr
: constant Node_Id
:= Expression
(Act
);
15118 if Nkind
(Expr
) = N_Subtype_Indication
then
15119 Perform_Appropriate_Analysis
(Subtype_Mark
(Expr
));
15121 -- Analyze separately each discriminant constraint, when
15122 -- given with a named association.
15128 Constr
:= First
(Constraints
(Constraint
(Expr
)));
15129 while Present
(Constr
) loop
15130 if Nkind
(Constr
) = N_Discriminant_Association
then
15131 Perform_Appropriate_Analysis
15132 (Expression
(Constr
));
15134 Perform_Appropriate_Analysis
(Constr
);
15142 Perform_Appropriate_Analysis
(Expr
);
15146 elsif Nkind
(Act
) /= N_Operator_Symbol
then
15147 Perform_Appropriate_Analysis
(Act
);
15149 -- Within a package instance, mark actuals that are limited
15150 -- views, so their use can be moved to the body of the
15153 if Is_Entity_Name
(Act
)
15154 and then Is_Type
(Entity
(Act
))
15155 and then From_Limited_With
(Entity
(Act
))
15156 and then Present
(Inst
)
15158 Append_Elmt
(Entity
(Act
), Incomplete_Actuals
(Inst
));
15162 if Errs
/= Serious_Errors_Detected
then
15164 -- Do a minimal analysis of the generic, to prevent spurious
15165 -- warnings complaining about the generic being unreferenced,
15166 -- before abandoning the instantiation.
15168 Perform_Appropriate_Analysis
(Name
(N
));
15170 if Is_Entity_Name
(Name
(N
))
15171 and then Etype
(Name
(N
)) /= Any_Type
15173 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
15174 Set_Is_Instantiated
(Entity
(Name
(N
)));
15177 if Present
(Cur
) then
15179 -- For the case of a child instance hiding an outer homonym,
15180 -- provide additional warning which might explain the error.
15182 Set_Is_Immediately_Visible
(Cur
, Vis
);
15184 ("& hides outer unit with the same name??",
15185 N
, Defining_Unit_Name
(N
));
15188 Abandon_Instantiation
(Act
);
15195 if Present
(Cur
) then
15196 Set_Is_Immediately_Visible
(Cur
, Vis
);
15198 end Preanalyze_Actuals
;
15200 -------------------------------
15201 -- Provide_Completing_Bodies --
15202 -------------------------------
15204 procedure Provide_Completing_Bodies
(N
: Node_Id
) is
15205 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
);
15206 -- Generate the completing body for subprogram declaration Subp_Decl
15208 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
);
15209 -- Generating completing bodies for all subprograms found in declarative
15212 ---------------------------
15213 -- Build_Completing_Body --
15214 ---------------------------
15216 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
) is
15217 Loc
: constant Source_Ptr
:= Sloc
(Subp_Decl
);
15218 Subp_Id
: constant Entity_Id
:= Defining_Entity
(Subp_Decl
);
15222 -- Nothing to do if the subprogram already has a completing body
15224 if Present
(Corresponding_Body
(Subp_Decl
)) then
15227 -- Mark the function as having a valid return statement even though
15228 -- the body contains a single raise statement.
15230 elsif Ekind
(Subp_Id
) = E_Function
then
15231 Set_Return_Present
(Subp_Id
);
15234 -- Clone the specification to obtain new entities and reset the only
15237 Spec
:= Copy_Subprogram_Spec
(Specification
(Subp_Decl
));
15238 Set_Generic_Parent
(Spec
, Empty
);
15241 -- function Func ... return ... is
15243 -- procedure Proc ... is
15245 -- raise Program_Error with "access before elaboration";
15248 Insert_After_And_Analyze
(Subp_Decl
,
15249 Make_Subprogram_Body
(Loc
,
15250 Specification
=> Spec
,
15251 Declarations
=> New_List
,
15252 Handled_Statement_Sequence
=>
15253 Make_Handled_Sequence_Of_Statements
(Loc
,
15254 Statements
=> New_List
(
15255 Make_Raise_Program_Error
(Loc
,
15256 Reason
=> PE_Access_Before_Elaboration
)))));
15257 end Build_Completing_Body
;
15259 ----------------------------------
15260 -- Provide_Completing_Bodies_In --
15261 ----------------------------------
15263 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
) is
15267 if Present
(Decls
) then
15268 Decl
:= First
(Decls
);
15269 while Present
(Decl
) loop
15270 Provide_Completing_Bodies
(Decl
);
15274 end Provide_Completing_Bodies_In
;
15280 -- Start of processing for Provide_Completing_Bodies
15283 if Nkind
(N
) = N_Package_Declaration
then
15284 Spec
:= Specification
(N
);
15286 Push_Scope
(Defining_Entity
(N
));
15287 Provide_Completing_Bodies_In
(Visible_Declarations
(Spec
));
15288 Provide_Completing_Bodies_In
(Private_Declarations
(Spec
));
15291 elsif Nkind
(N
) = N_Subprogram_Declaration
then
15292 Build_Completing_Body
(N
);
15294 end Provide_Completing_Bodies
;
15296 -------------------
15297 -- Remove_Parent --
15298 -------------------
15300 procedure Remove_Parent
(In_Body
: Boolean := False) is
15301 S
: Entity_Id
:= Current_Scope
;
15302 -- S is the scope containing the instantiation just completed. The scope
15303 -- stack contains the parent instances of the instantiation, followed by
15312 -- After child instantiation is complete, remove from scope stack the
15313 -- extra copy of the current scope, and then remove parent instances.
15315 if not In_Body
then
15318 while Current_Scope
/= S
loop
15319 P
:= Current_Scope
;
15320 End_Package_Scope
(Current_Scope
);
15322 if In_Open_Scopes
(P
) then
15323 E
:= First_Entity
(P
);
15324 while Present
(E
) loop
15325 Set_Is_Immediately_Visible
(E
, True);
15329 -- If instantiation is declared in a block, it is the enclosing
15330 -- scope that might be a parent instance. Note that only one
15331 -- block can be involved, because the parent instances have
15332 -- been installed within it.
15334 if Ekind
(P
) = E_Block
then
15335 Cur_P
:= Scope
(P
);
15340 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
15341 -- We are within an instance of some sibling. Retain
15342 -- visibility of parent, for proper subsequent cleanup, and
15343 -- reinstall private declarations as well.
15345 Set_In_Private_Part
(P
);
15346 Install_Private_Declarations
(P
);
15349 -- If the ultimate parent is a top-level unit recorded in
15350 -- Instance_Parent_Unit, then reset its visibility to what it was
15351 -- before instantiation. (It's not clear what the purpose is of
15352 -- testing whether Scope (P) is In_Open_Scopes, but that test was
15353 -- present before the ultimate parent test was added.???)
15355 elsif not In_Open_Scopes
(Scope
(P
))
15356 or else (P
= Instance_Parent_Unit
15357 and then not Parent_Unit_Visible
)
15359 Set_Is_Immediately_Visible
(P
, False);
15361 -- If the current scope is itself an instantiation of a generic
15362 -- nested within P, and we are in the private part of body of this
15363 -- instantiation, restore the full views of P, that were removed
15364 -- in End_Package_Scope above. This obscure case can occur when a
15365 -- subunit of a generic contains an instance of a child unit of
15366 -- its generic parent unit.
15368 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
)
15369 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
15372 Par
: constant Entity_Id
:=
15373 Generic_Parent
(Package_Specification
(S
));
15376 and then P
= Scope
(Par
)
15378 Set_In_Private_Part
(P
);
15379 Install_Private_Declarations
(P
);
15385 -- Reset visibility of entities in the enclosing scope
15387 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
15389 Hidden
:= First_Elmt
(Hidden_Entities
);
15390 while Present
(Hidden
) loop
15391 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
15392 Next_Elmt
(Hidden
);
15396 -- Each body is analyzed separately, and there is no context that
15397 -- needs preserving from one body instance to the next, so remove all
15398 -- parent scopes that have been installed.
15400 while Present
(S
) loop
15401 End_Package_Scope
(S
);
15402 Set_Is_Immediately_Visible
(S
, False);
15403 S
:= Current_Scope
;
15404 exit when S
= Standard_Standard
;
15413 procedure Restore_Env
is
15414 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
15417 if No
(Current_Instantiated_Parent
.Act_Id
) then
15418 -- Restore environment after subprogram inlining
15420 Restore_Private_Views
(Empty
);
15423 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
15424 Exchanged_Views
:= Saved
.Exchanged_Views
;
15425 Hidden_Entities
:= Saved
.Hidden_Entities
;
15426 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
15427 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
15428 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
15430 Restore_Config_Switches
(Saved
.Switches
);
15432 Instance_Envs
.Decrement_Last
;
15435 ---------------------------
15436 -- Restore_Private_Views --
15437 ---------------------------
15439 procedure Restore_Private_Views
15440 (Pack_Id
: Entity_Id
;
15441 Is_Package
: Boolean := True)
15446 Dep_Elmt
: Elmt_Id
;
15449 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
15450 -- Hide the generic formals of formal packages declared with box which
15451 -- were reachable in the current instantiation.
15453 ---------------------------
15454 -- Restore_Nested_Formal --
15455 ---------------------------
15457 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
15458 pragma Assert
(Ekind
(Formal
) = E_Package
);
15461 if Present
(Renamed_Entity
(Formal
))
15462 and then Denotes_Formal_Package
(Renamed_Entity
(Formal
), True)
15466 elsif Present
(Associated_Formal_Package
(Formal
)) then
15467 Ent
:= First_Entity
(Formal
);
15468 while Present
(Ent
) loop
15469 exit when Ekind
(Ent
) = E_Package
15470 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
15472 Set_Is_Hidden
(Ent
);
15473 Set_Is_Potentially_Use_Visible
(Ent
, False);
15475 -- If package, then recurse
15477 if Ekind
(Ent
) = E_Package
then
15478 Restore_Nested_Formal
(Ent
);
15484 end Restore_Nested_Formal
;
15486 -- Start of processing for Restore_Private_Views
15489 M
:= First_Elmt
(Exchanged_Views
);
15490 while Present
(M
) loop
15493 -- Subtypes of types whose views have been exchanged, and that are
15494 -- defined within the instance, were not on the Private_Dependents
15495 -- list on entry to the instance, so they have to be exchanged
15496 -- explicitly now, in order to remain consistent with the view of the
15499 if Ekind
(Typ
) in E_Private_Type
15500 | E_Limited_Private_Type
15501 | E_Record_Type_With_Private
15503 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
15504 while Present
(Dep_Elmt
) loop
15505 Dep_Typ
:= Node
(Dep_Elmt
);
15507 if Scope
(Dep_Typ
) = Pack_Id
15508 and then Present
(Full_View
(Dep_Typ
))
15510 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
15511 Exchange_Declarations
(Dep_Typ
);
15514 Next_Elmt
(Dep_Elmt
);
15518 Exchange_Declarations
(Node
(M
));
15522 if No
(Pack_Id
) then
15526 -- Make the generic formal parameters private, and make the formal types
15527 -- into subtypes of the actuals again.
15529 E
:= First_Entity
(Pack_Id
);
15530 while Present
(E
) loop
15531 Set_Is_Hidden
(E
, True);
15534 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
15536 -- Always preserve the flag Is_Generic_Actual_Type for GNATprove,
15537 -- as it is needed to identify the subtype with the type it
15538 -- renames, when there are conversions between access types
15541 if GNATprove_Mode
then
15544 -- If the actual for E is itself a generic actual type from
15545 -- an enclosing instance, E is still a generic actual type
15546 -- outside of the current instance. This matter when resolving
15547 -- an overloaded call that may be ambiguous in the enclosing
15548 -- instance, when two of its actuals coincide.
15550 elsif Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
15551 and then Is_Generic_Actual_Type
15552 (Entity
(Subtype_Indication
(Parent
(E
))))
15556 Set_Is_Generic_Actual_Type
(E
, False);
15558 -- It might seem reasonable to clear the Is_Generic_Actual_Type
15559 -- flag also on the Full_View if the type is private, since it
15560 -- was set also on this Full_View. However, this flag is relied
15561 -- upon by Covers to spot "types exported from instantiations"
15562 -- which are implicit Full_Views built for instantiations made
15563 -- on private types and we get type mismatches if we do it when
15564 -- the block exchanging the declarations below triggers ???
15566 -- if Is_Private_Type (E) and then Present (Full_View (E)) then
15567 -- Set_Is_Generic_Actual_Type (Full_View (E), False);
15571 -- An unusual case of aliasing: the actual may also be directly
15572 -- visible in the generic, and be private there, while it is fully
15573 -- visible in the context of the instance. The internal subtype
15574 -- is private in the instance but has full visibility like its
15575 -- parent in the enclosing scope. This enforces the invariant that
15576 -- the privacy status of all private dependents of a type coincide
15577 -- with that of the parent type. This can only happen when a
15578 -- generic child unit is instantiated within a sibling.
15580 if Is_Private_Type
(E
)
15581 and then not Is_Private_Type
(Etype
(E
))
15583 Exchange_Declarations
(E
);
15586 elsif Ekind
(E
) = E_Package
then
15588 -- The end of the renaming list is the renaming of the generic
15589 -- package itself. If the instance is a subprogram, all entities
15590 -- in the corresponding package are renamings. If this entity is
15591 -- a formal package, make its own formals private as well. The
15592 -- actual in this case is itself the renaming of an instantiation.
15593 -- If the entity is not a package renaming, it is the entity
15594 -- created to validate formal package actuals: ignore it.
15596 -- If the actual is itself a formal package for the enclosing
15597 -- generic, or the actual for such a formal package, it remains
15598 -- visible on exit from the instance, and therefore nothing needs
15599 -- to be done either, except to keep it accessible.
15601 if Is_Package
and then Renamed_Entity
(E
) = Pack_Id
then
15604 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
15608 Denotes_Formal_Package
(Renamed_Entity
(E
), True, Pack_Id
)
15610 Set_Is_Hidden
(E
, False);
15614 Act_P
: constant Entity_Id
:= Renamed_Entity
(E
);
15618 Id
:= First_Entity
(Act_P
);
15620 and then Id
/= First_Private_Entity
(Act_P
)
15622 exit when Ekind
(Id
) = E_Package
15623 and then Renamed_Entity
(Id
) = Act_P
;
15625 Set_Is_Hidden
(Id
, True);
15626 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
15628 if Ekind
(Id
) = E_Package
then
15629 Restore_Nested_Formal
(Id
);
15640 end Restore_Private_Views
;
15647 (Gen_Unit
: Entity_Id
;
15648 Act_Unit
: Entity_Id
)
15652 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
15655 ----------------------------
15656 -- Save_Global_References --
15657 ----------------------------
15659 procedure Save_Global_References
(Templ
: Node_Id
) is
15661 -- ??? it is horrible to use global variables in highly recursive code
15664 -- The entity of the current associated node
15666 Gen_Scope
: Entity_Id
;
15667 -- The scope of the generic for which references are being saved
15670 -- The current associated node
15672 function Is_Global
(E
: Entity_Id
) return Boolean;
15673 -- Check whether entity is defined outside of generic unit. Examine the
15674 -- scope of an entity, and the scope of the scope, etc, until we find
15675 -- either Standard, in which case the entity is global, or the generic
15676 -- unit itself, which indicates that the entity is local. If the entity
15677 -- is the generic unit itself, as in the case of a recursive call, or
15678 -- the enclosing generic unit, if different from the current scope, then
15679 -- it is local as well, because it will be replaced at the point of
15680 -- instantiation. On the other hand, if it is a reference to a child
15681 -- unit of a common ancestor, which appears in an instantiation, it is
15682 -- global because it is used to denote a specific compilation unit at
15683 -- the time the instantiations will be analyzed.
15685 procedure Qualify_Universal_Operands
15687 Func_Call
: Node_Id
);
15688 -- Op denotes a binary or unary operator in generic template Templ. Node
15689 -- Func_Call is the function call alternative of the operator within the
15690 -- the analyzed copy of the template. Change each operand which yields a
15691 -- universal type by wrapping it into a qualified expression
15693 -- Actual_Typ'(Operand)
15695 -- where Actual_Typ is the type of corresponding actual parameter of
15696 -- Operand in Func_Call.
15698 procedure Reset_Entity
(N
: Node_Id
);
15699 -- Save semantic information on global entity so that it is not resolved
15700 -- again at instantiation time.
15702 procedure Save_Entity_Descendants
(N
: Node_Id
);
15703 -- Apply Save_Global_References to the two syntactic descendants of
15704 -- non-terminal nodes that carry an Associated_Node and are processed
15705 -- through Reset_Entity. Once the global entity (if any) has been
15706 -- captured together with its type, only two syntactic descendants need
15707 -- to be traversed to complete the processing of the tree rooted at N.
15708 -- This applies to Selected_Components, Expanded_Names, and to Operator
15709 -- nodes. N can also be a character literal, identifier, or operator
15710 -- symbol node, but the call has no effect in these cases.
15712 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
);
15713 -- Default actuals in nested instances must be handled specially
15714 -- because there is no link to them from the original tree. When an
15715 -- actual subprogram is given by a default, we add an explicit generic
15716 -- association for it in the instantiation node. When we save the
15717 -- global references on the name of the instance, we recover the list
15718 -- of generic associations, and add an explicit one to the original
15719 -- generic tree, through which a global actual can be preserved.
15720 -- Similarly, if a child unit is instantiated within a sibling, in the
15721 -- context of the parent, we must preserve the identifier of the parent
15722 -- so that it can be properly resolved in a subsequent instantiation.
15724 procedure Save_Global_Descendant
(D
: Union_Id
);
15725 -- Apply Save_References recursively to the descendants of node D
15727 procedure Save_References
(N
: Node_Id
);
15728 -- This is the recursive procedure that does the work, once the
15729 -- enclosing generic scope has been established.
15735 function Is_Global
(E
: Entity_Id
) return Boolean is
15738 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
15739 -- Determine whether the parent node of a reference to a child unit
15740 -- denotes an instantiation or a formal package, in which case the
15741 -- reference to the child unit is global, even if it appears within
15742 -- the current scope (e.g. when the instance appears within the body
15743 -- of an ancestor).
15745 ----------------------
15746 -- Is_Instance_Node --
15747 ----------------------
15749 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
15751 return Nkind
(Decl
) in N_Generic_Instantiation
15753 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
15754 end Is_Instance_Node
;
15756 -- Start of processing for Is_Global
15759 if E
= Gen_Scope
then
15762 elsif E
= Standard_Standard
then
15765 -- E should be an entity, but it is not always
15767 elsif Nkind
(E
) not in N_Entity
then
15770 elsif Nkind
(E
) /= N_Expanded_Name
15771 and then Is_Child_Unit
(E
)
15772 and then (Is_Instance_Node
(Parent
(N2
))
15773 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
15774 and then N2
= Selector_Name
(Parent
(N2
))
15776 Is_Instance_Node
(Parent
(Parent
(N2
)))))
15781 -- E may be an expanded name - typically an operator - in which
15782 -- case we must find its enclosing scope since expanded names
15783 -- don't have corresponding scopes.
15785 if Nkind
(E
) = N_Expanded_Name
then
15786 Se
:= Find_Enclosing_Scope
(E
);
15788 -- Otherwise, E is an entity and will have Scope set
15794 while Se
/= Gen_Scope
loop
15795 if Se
= Standard_Standard
then
15806 --------------------------------
15807 -- Qualify_Universal_Operands --
15808 --------------------------------
15810 procedure Qualify_Universal_Operands
15812 Func_Call
: Node_Id
)
15814 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
);
15815 -- Rewrite operand Opnd as a qualified expression of the form
15817 -- Actual_Typ'(Opnd)
15819 -- where Actual is the corresponding actual parameter of Opnd in
15820 -- function call Func_Call.
15822 function Qualify_Type
15824 Typ
: Entity_Id
) return Node_Id
;
15825 -- Qualify type Typ by creating a selected component of the form
15827 -- Scope_Of_Typ.Typ
15829 ---------------------
15830 -- Qualify_Operand --
15831 ---------------------
15833 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
) is
15834 Loc
: constant Source_Ptr
:= Sloc
(Opnd
);
15835 Typ
: constant Entity_Id
:= Etype
(Actual
);
15840 -- Qualify the operand when it is of a universal type. Note that
15841 -- the template is unanalyzed and it is not possible to directly
15842 -- query the type. This transformation is not done when the type
15843 -- of the actual is internally generated because the type will be
15844 -- regenerated in the instance.
15846 if Yields_Universal_Type
(Opnd
)
15847 and then Comes_From_Source
(Typ
)
15848 and then not Is_Hidden
(Typ
)
15850 -- The type of the actual may be a global reference. Save this
15851 -- information by creating a reference to it.
15853 if Is_Global
(Typ
) then
15854 Mark
:= New_Occurrence_Of
(Typ
, Loc
);
15856 -- Otherwise rely on resolution to find the proper type within
15860 Mark
:= Qualify_Type
(Loc
, Typ
);
15864 Make_Qualified_Expression
(Loc
,
15865 Subtype_Mark
=> Mark
,
15866 Expression
=> Relocate_Node
(Opnd
));
15868 -- Mark the qualification to distinguish it from other source
15869 -- constructs and signal the instantiation mechanism that this
15870 -- node requires special processing. See Copy_Generic_Node for
15873 Set_Is_Qualified_Universal_Literal
(Qual
);
15875 Rewrite
(Opnd
, Qual
);
15877 end Qualify_Operand
;
15883 function Qualify_Type
15885 Typ
: Entity_Id
) return Node_Id
15887 Scop
: constant Entity_Id
:= Scope
(Typ
);
15891 Result
:= Make_Identifier
(Loc
, Chars
(Typ
));
15893 if Present
(Scop
) and then not Is_Generic_Unit
(Scop
) then
15895 Make_Selected_Component
(Loc
,
15896 Prefix
=> Make_Identifier
(Loc
, Chars
(Scop
)),
15897 Selector_Name
=> Result
);
15905 Actuals
: constant List_Id
:= Parameter_Associations
(Func_Call
);
15907 -- Start of processing for Qualify_Universal_Operands
15910 if Nkind
(Op
) in N_Binary_Op
then
15911 Qualify_Operand
(Left_Opnd
(Op
), First
(Actuals
));
15912 Qualify_Operand
(Right_Opnd
(Op
), Next
(First
(Actuals
)));
15914 elsif Nkind
(Op
) in N_Unary_Op
then
15915 Qualify_Operand
(Right_Opnd
(Op
), First
(Actuals
));
15917 end Qualify_Universal_Operands
;
15923 procedure Reset_Entity
(N
: Node_Id
) is
15924 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
15925 -- If the type of N2 is global to the generic unit, save the type in
15926 -- the generic node. Just as we perform name capture for explicit
15927 -- references within the generic, we must capture the global types
15928 -- of local entities because they may participate in resolution in
15931 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
15932 -- Find the ultimate ancestor of the current unit. If it is not a
15933 -- generic unit, then the name of the current unit in the prefix of
15934 -- an expanded name must be replaced with its generic homonym to
15935 -- ensure that it will be properly resolved in an instance.
15937 ---------------------
15938 -- Set_Global_Type --
15939 ---------------------
15941 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
15942 Typ
: constant Entity_Id
:= Etype
(N2
);
15945 Set_Etype
(N
, Typ
);
15947 -- If the entity of N is not the associated node, this is a
15948 -- nested generic and it has an associated node as well, whose
15949 -- type is already the full view (see below). Indicate that the
15950 -- original node has a private view.
15952 if Entity
(N
) /= N2
and then Has_Private_View
(Entity
(N
)) then
15953 Set_Has_Private_View
(N
);
15956 -- If not a private type, nothing else to do
15958 if not Is_Private_Type
(Typ
) then
15961 -- If it is a derivation of a private type in a context where no
15962 -- full view is needed, nothing to do either.
15964 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
15967 -- Otherwise mark the type for flipping and use the full view when
15971 Set_Has_Private_View
(N
);
15973 if Present
(Full_View
(Typ
)) then
15974 Set_Etype
(N2
, Full_View
(Typ
));
15978 if Is_Floating_Point_Type
(Typ
)
15979 and then Has_Dimension_System
(Typ
)
15981 Copy_Dimensions
(N2
, N
);
15983 end Set_Global_Type
;
15989 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
15994 while Is_Child_Unit
(Par
) loop
15995 Par
:= Scope
(Par
);
16001 -- Start of processing for Reset_Entity
16004 N2
:= Get_Associated_Node
(N
);
16007 if Present
(E
) then
16009 -- If the node is an entry call to an entry in an enclosing task,
16010 -- it is rewritten as a selected component. No global entity to
16011 -- preserve in this case, since the expansion will be redone in
16014 if Nkind
(E
) not in N_Entity
then
16015 Set_Associated_Node
(N
, Empty
);
16016 Set_Etype
(N
, Empty
);
16020 -- If the entity is an itype created as a subtype of an access
16021 -- type with a null exclusion restore source entity for proper
16022 -- visibility. The itype will be created anew in the instance.
16025 and then Ekind
(E
) = E_Access_Subtype
16026 and then Is_Entity_Name
(N
)
16027 and then Chars
(Etype
(E
)) = Chars
(N
)
16030 Set_Entity
(N2
, E
);
16034 if Is_Global
(E
) then
16035 Set_Global_Type
(N
, N2
);
16037 elsif Nkind
(N
) = N_Op_Concat
16038 and then Is_Generic_Type
(Etype
(N2
))
16039 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
16041 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
16042 and then Is_Intrinsic_Subprogram
(E
)
16046 -- Entity is local. Mark generic node as unresolved. Note that now
16047 -- it does not have an entity.
16050 Set_Associated_Node
(N
, Empty
);
16051 Set_Etype
(N
, Empty
);
16054 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
16055 and then N
= Name
(Parent
(N
))
16057 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
16060 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16061 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
16063 -- In case of previous errors, the tree might be malformed
16065 if No
(Entity
(Parent
(N2
))) then
16068 elsif Is_Global
(Entity
(Parent
(N2
))) then
16069 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16070 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
16071 Set_Global_Type
(Parent
(N
), Parent
(N2
));
16072 Save_Entity_Descendants
(N
);
16074 -- If this is a reference to the current generic entity, replace
16075 -- by the name of the generic homonym of the current package. This
16076 -- is because in an instantiation Par.P.Q will not resolve to the
16077 -- name of the instance, whose enclosing scope is not necessarily
16078 -- Par. We use the generic homonym rather that the name of the
16079 -- generic itself because it may be hidden by a local declaration.
16081 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
16083 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
16085 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
16086 Rewrite
(Parent
(N
),
16087 Make_Identifier
(Sloc
(N
),
16089 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
16091 Rewrite
(Parent
(N
),
16092 Make_Identifier
(Sloc
(N
),
16093 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
16097 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
16098 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
16100 Save_Global_Defaults
16101 (Parent
(Parent
(N
)), Parent
(Parent
(N2
)));
16104 -- A selected component may denote a static constant that has been
16105 -- folded. If the static constant is global to the generic, capture
16106 -- its value. Otherwise the folding will happen in any instantiation.
16108 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16109 and then Nkind
(Parent
(N2
)) in N_Integer_Literal | N_Real_Literal
16111 if Present
(Entity
(Original_Node
(Parent
(N2
))))
16112 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
16114 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
16115 Set_Analyzed
(Parent
(N
), False);
16118 -- A selected component may be transformed into a parameterless
16119 -- function call. If the called entity is global, rewrite the node
16120 -- appropriately, i.e. as an extended name for the global entity.
16122 elsif Nkind
(Parent
(N
)) = N_Selected_Component
16123 and then Nkind
(Parent
(N2
)) = N_Function_Call
16124 and then N
= Selector_Name
(Parent
(N
))
16126 if No
(Parameter_Associations
(Parent
(N2
))) then
16127 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
16128 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
16129 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
16130 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
16131 Save_Entity_Descendants
(N
);
16134 Set_Is_Prefixed_Call
(Parent
(N
));
16135 Set_Associated_Node
(N
, Empty
);
16136 Set_Etype
(N
, Empty
);
16139 -- In Ada 2005, X.F may be a call to a primitive operation,
16140 -- rewritten as F (X). This rewriting will be done again in an
16141 -- instance, so keep the original node. Global entities will be
16142 -- captured as for other constructs. Indicate that this must
16143 -- resolve as a call, to prevent accidental overloading in the
16144 -- instance, if both a component and a primitive operation appear
16148 Set_Is_Prefixed_Call
(Parent
(N
));
16151 -- Entity is local. Reset in generic unit, so that node is resolved
16152 -- anew at the point of instantiation.
16155 Set_Associated_Node
(N
, Empty
);
16156 Set_Etype
(N
, Empty
);
16160 -----------------------------
16161 -- Save_Entity_Descendants --
16162 -----------------------------
16164 procedure Save_Entity_Descendants
(N
: Node_Id
) is
16167 when N_Binary_Op
=>
16168 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
16169 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16172 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
16174 when N_Expanded_Name
16175 | N_Selected_Component
16177 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
16178 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
16180 when N_Character_Literal
16182 | N_Operator_Symbol
16187 raise Program_Error
;
16189 end Save_Entity_Descendants
;
16191 --------------------------
16192 -- Save_Global_Defaults --
16193 --------------------------
16195 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
) is
16196 Loc
: constant Source_Ptr
:= Sloc
(N1
);
16197 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
16198 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
16205 Actual
: Entity_Id
;
16208 Assoc1
:= Generic_Associations
(N1
);
16210 if Present
(Assoc1
) then
16211 Act1
:= First
(Assoc1
);
16214 Set_Generic_Associations
(N1
, New_List
);
16215 Assoc1
:= Generic_Associations
(N1
);
16218 if Present
(Assoc2
) then
16219 Act2
:= First
(Assoc2
);
16224 while Present
(Act1
) and then Present
(Act2
) loop
16229 -- Find the associations added for default subprograms
16231 if Present
(Act2
) then
16232 while Nkind
(Act2
) /= N_Generic_Association
16233 or else No
(Entity
(Selector_Name
(Act2
)))
16234 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
16239 -- Add a similar association if the default is global. The
16240 -- renaming declaration for the actual has been analyzed, and
16241 -- its alias is the program it renames. Link the actual in the
16242 -- original generic tree with the node in the analyzed tree.
16244 while Present
(Act2
) loop
16245 Subp
:= Entity
(Selector_Name
(Act2
));
16246 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
16248 -- Following test is defence against rubbish errors
16250 if No
(Alias
(Subp
)) then
16254 -- Retrieve the resolved actual from the renaming declaration
16255 -- created for the instantiated formal.
16257 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
16258 Set_Entity
(Def
, Actual
);
16259 Set_Etype
(Def
, Etype
(Actual
));
16261 if Is_Global
(Actual
) then
16263 Make_Generic_Association
(Loc
,
16265 New_Occurrence_Of
(Subp
, Loc
),
16266 Explicit_Generic_Actual_Parameter
=>
16267 New_Occurrence_Of
(Actual
, Loc
));
16269 Set_Associated_Node
16270 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
16272 Append
(Ndec
, Assoc1
);
16274 -- If there are other defaults, add a dummy association in case
16275 -- there are other defaulted formals with the same name.
16277 elsif Present
(Next
(Act2
)) then
16279 Make_Generic_Association
(Loc
,
16281 New_Occurrence_Of
(Subp
, Loc
),
16282 Explicit_Generic_Actual_Parameter
=> Empty
);
16284 Append
(Ndec
, Assoc1
);
16291 if Nkind
(Name
(N1
)) = N_Identifier
16292 and then Is_Child_Unit
(Gen_Id
)
16293 and then Is_Global
(Gen_Id
)
16294 and then Is_Generic_Unit
(Scope
(Gen_Id
))
16295 and then In_Open_Scopes
(Scope
(Gen_Id
))
16297 -- This is an instantiation of a child unit within a sibling, so
16298 -- that the generic parent is in scope. An eventual instance must
16299 -- occur within the scope of an instance of the parent. Make name
16300 -- in instance into an expanded name, to preserve the identifier
16301 -- of the parent, so it can be resolved subsequently.
16303 Rewrite
(Name
(N2
),
16304 Make_Expanded_Name
(Loc
,
16305 Chars
=> Chars
(Gen_Id
),
16306 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16307 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16308 Set_Entity
(Name
(N2
), Gen_Id
);
16310 Rewrite
(Name
(N1
),
16311 Make_Expanded_Name
(Loc
,
16312 Chars
=> Chars
(Gen_Id
),
16313 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
16314 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
16316 Set_Associated_Node
(Name
(N1
), Name
(N2
));
16317 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
16318 Set_Associated_Node
16319 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
16320 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
16322 end Save_Global_Defaults
;
16324 ----------------------------
16325 -- Save_Global_Descendant --
16326 ----------------------------
16328 procedure Save_Global_Descendant
(D
: Union_Id
) is
16332 if D
in Node_Range
then
16333 if D
= Union_Id
(Empty
) then
16336 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
16337 Save_References
(Node_Id
(D
));
16340 elsif D
in List_Range
then
16341 pragma Assert
(D
/= Union_Id
(No_List
));
16342 -- Because No_List = Empty, which is in Node_Range above
16344 N1
:= First
(List_Id
(D
));
16345 while Present
(N1
) loop
16346 Save_References
(N1
);
16350 -- Element list or other non-node field, nothing to do
16355 end Save_Global_Descendant
;
16357 ---------------------
16358 -- Save_References --
16359 ---------------------
16361 -- This is the recursive procedure that does the work once the enclosing
16362 -- generic scope has been established. We have to treat specially a
16363 -- number of node rewritings that are required by semantic processing
16364 -- and which change the kind of nodes in the generic copy: typically
16365 -- constant-folding, replacing an operator node by a string literal, or
16366 -- a selected component by an expanded name. In each of those cases, the
16367 -- transformation is propagated to the generic unit.
16369 procedure Save_References
(N
: Node_Id
) is
16370 Loc
: constant Source_Ptr
:= Sloc
(N
);
16372 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean;
16373 -- Determine whether arbitrary node Nod requires delayed capture of
16374 -- global references within its aspect specifications.
16376 procedure Save_References_In_Aggregate
(N
: Node_Id
);
16377 -- Save all global references in [extension] aggregate node N
16379 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
);
16380 -- Save all global references in a character literal or operator
16381 -- symbol denoted by N.
16383 procedure Save_References_In_Descendants
(N
: Node_Id
);
16384 -- Save all global references in all descendants of node N
16386 procedure Save_References_In_Identifier
(N
: Node_Id
);
16387 -- Save all global references in identifier node N
16389 procedure Save_References_In_Operator
(N
: Node_Id
);
16390 -- Save all global references in operator node N
16392 procedure Save_References_In_Pragma
(Prag
: Node_Id
);
16393 -- Save all global references found within the expression of pragma
16396 ---------------------------
16397 -- Requires_Delayed_Save --
16398 ---------------------------
16400 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean is
16402 -- Generic packages and subprograms require delayed capture of
16403 -- global references within their aspects due to the timing of
16404 -- annotation analysis.
16406 if Nkind
(Nod
) in N_Generic_Package_Declaration
16407 | N_Generic_Subprogram_Declaration
16409 | N_Package_Body_Stub
16410 | N_Subprogram_Body
16411 | N_Subprogram_Body_Stub
16413 -- Since the capture of global references is done on the
16414 -- unanalyzed generic template, there is no information around
16415 -- to infer the context. Use the Associated_Entity linkages to
16416 -- peek into the analyzed generic copy and determine what the
16417 -- template corresponds to.
16419 if Nod
= Templ
then
16421 Is_Generic_Declaration_Or_Body
16422 (Unit_Declaration_Node
16423 (Associated_Entity
(Defining_Entity
(Nod
))));
16425 -- Otherwise the generic unit being processed is not the top
16426 -- level template. It is safe to capture of global references
16427 -- within the generic unit because at this point the top level
16428 -- copy is fully analyzed.
16434 -- Otherwise capture the global references without interference
16439 end Requires_Delayed_Save
;
16441 ----------------------------------
16442 -- Save_References_In_Aggregate --
16443 ----------------------------------
16445 procedure Save_References_In_Aggregate
(N
: Node_Id
) is
16447 Qual
: Node_Id
:= Empty
;
16448 Typ
: Entity_Id
:= Empty
;
16451 N2
:= Get_Associated_Node
(N
);
16453 if Present
(N2
) then
16456 -- In an instance within a generic, use the name of the actual
16457 -- and not the original generic parameter. If the actual is
16458 -- global in the current generic it must be preserved for its
16461 if Parent_Kind
(Typ
) = N_Subtype_Declaration
16462 and then Present
(Generic_Parent_Type
(Parent
(Typ
)))
16464 Typ
:= Base_Type
(Typ
);
16465 Set_Etype
(N2
, Typ
);
16469 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
16470 Set_Associated_Node
(N
, Empty
);
16472 -- If the aggregate is an actual in a call, it has been
16473 -- resolved in the current context, to some local type. The
16474 -- enclosing call may have been disambiguated by the aggregate,
16475 -- and this disambiguation might fail at instantiation time
16476 -- because the type to which the aggregate did resolve is not
16477 -- preserved. In order to preserve some of this information,
16478 -- wrap the aggregate in a qualified expression, using the id
16479 -- of its type. For further disambiguation we qualify the type
16480 -- name with its scope (if visible and not hidden by a local
16481 -- homograph) because both id's will have corresponding
16482 -- entities in an instance. This resolves most of the problems
16483 -- with missing type information on aggregates in instances.
16486 and then Nkind
(N2
) = Nkind
(N
)
16487 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
16488 and then Present
(Typ
)
16489 and then Comes_From_Source
(Typ
)
16491 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
16493 if Is_Immediately_Visible
(Scope
(Typ
))
16495 (not In_Open_Scopes
(Scope
(Typ
))
16496 or else Current_Entity
(Scope
(Typ
)) = Scope
(Typ
))
16499 Make_Selected_Component
(Loc
,
16501 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
16502 Selector_Name
=> Nam
);
16506 Make_Qualified_Expression
(Loc
,
16507 Subtype_Mark
=> Nam
,
16508 Expression
=> Relocate_Node
(N
));
16512 if Nkind
(N
) = N_Aggregate
then
16513 Save_Global_Descendant
(Union_Id
(Aggregate_Bounds
(N
)));
16515 elsif Nkind
(N
) = N_Extension_Aggregate
then
16516 Save_Global_Descendant
(Union_Id
(Ancestor_Part
(N
)));
16519 pragma Assert
(False);
16522 Save_Global_Descendant
(Union_Id
(Expressions
(N
)));
16523 Save_Global_Descendant
(Union_Id
(Component_Associations
(N
)));
16524 Save_Global_Descendant
(Union_Id
(Etype
(N
)));
16526 if Present
(Qual
) then
16529 end Save_References_In_Aggregate
;
16531 ----------------------------------------------
16532 -- Save_References_In_Char_Lit_Or_Op_Symbol --
16533 ----------------------------------------------
16535 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
) is
16537 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16540 elsif Nkind
(N
) = N_Operator_Symbol
16541 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
16543 Change_Operator_Symbol_To_String_Literal
(N
);
16545 end Save_References_In_Char_Lit_Or_Op_Symbol
;
16547 ------------------------------------
16548 -- Save_References_In_Descendants --
16549 ------------------------------------
16551 procedure Save_References_In_Descendants
(N
: Node_Id
) is
16552 procedure Walk
is new Walk_Sinfo_Fields
(Save_Global_Descendant
);
16555 end Save_References_In_Descendants
;
16557 -----------------------------------
16558 -- Save_References_In_Identifier --
16559 -----------------------------------
16561 procedure Save_References_In_Identifier
(N
: Node_Id
) is
16563 -- The node did not undergo a transformation
16565 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16566 -- If this is a discriminant reference, always save it.
16567 -- It is used in the instance to find the corresponding
16568 -- discriminant positionally rather than by name.
16570 Set_Original_Discriminant
16571 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
16575 -- The analysis of the generic copy transformed the identifier
16576 -- into another construct. Propagate the changes to the template.
16579 N2
:= Get_Associated_Node
(N
);
16581 -- The identifier denotes a call to a parameterless function.
16582 -- Mark the node as resolved when the function is external.
16584 if Nkind
(N2
) = N_Function_Call
then
16585 E
:= Entity
(Name
(N2
));
16587 if Present
(E
) and then Is_Global
(E
) then
16588 Set_Etype
(N
, Etype
(N2
));
16590 Set_Associated_Node
(N
, Empty
);
16591 Set_Etype
(N
, Empty
);
16594 -- The identifier denotes a named number that was constant
16595 -- folded. Preserve the original name for ASIS and undo the
16596 -- constant folding which will be repeated in the instance.
16597 -- Is this still needed???
16599 elsif Nkind
(N2
) in N_Integer_Literal | N_Real_Literal
16600 and then Is_Entity_Name
(Original_Node
(N2
))
16602 Set_Associated_Node
(N
, Original_Node
(N2
));
16605 -- The identifier resolved to a string literal. Propagate this
16606 -- information to the generic template.
16608 elsif Nkind
(N2
) = N_String_Literal
then
16609 Rewrite
(N
, New_Copy
(N2
));
16611 -- The identifier is rewritten as a dereference if it is the
16612 -- prefix of an implicit dereference. Preserve the original
16613 -- tree as the analysis of the instance will expand the node
16614 -- again, but preserve the resolved entity if it is global.
16616 elsif Nkind
(N2
) = N_Explicit_Dereference
then
16617 if Is_Entity_Name
(Prefix
(N2
))
16618 and then Present
(Entity
(Prefix
(N2
)))
16619 and then Is_Global
(Entity
(Prefix
(N2
)))
16621 Set_Associated_Node
(N
, Prefix
(N2
));
16623 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
16624 and then Present
(Entity
(Name
(Prefix
(N2
))))
16625 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
16628 Make_Explicit_Dereference
(Loc
,
16630 Make_Function_Call
(Loc
,
16633 (Entity
(Name
(Prefix
(N2
))), Loc
))));
16636 Set_Associated_Node
(N
, Empty
);
16637 Set_Etype
(N
, Empty
);
16640 -- The subtype mark of a nominally unconstrained object is
16641 -- rewritten as a subtype indication using the bounds of the
16642 -- expression. Recover the original subtype mark.
16644 elsif Nkind
(N2
) = N_Subtype_Indication
16645 and then Is_Entity_Name
(Original_Node
(N2
))
16647 Set_Associated_Node
(N
, Original_Node
(N2
));
16651 end Save_References_In_Identifier
;
16653 ---------------------------------
16654 -- Save_References_In_Operator --
16655 ---------------------------------
16657 procedure Save_References_In_Operator
(N
: Node_Id
) is
16659 -- The node did not undergo a transformation
16661 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
16662 if Nkind
(N
) = N_Op_Concat
then
16663 Set_Is_Component_Left_Opnd
(N
,
16664 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
16666 Set_Is_Component_Right_Opnd
(N
,
16667 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
16672 -- The analysis of the generic copy transformed the operator into
16673 -- some other construct. Propagate the changes to the template if
16677 N2
:= Get_Associated_Node
(N
);
16679 -- The operator resoved to a function call
16681 if Nkind
(N2
) = N_Function_Call
then
16683 -- Add explicit qualifications in the generic template for
16684 -- all operands of universal type. This aids resolution by
16685 -- preserving the actual type of a literal or an attribute
16686 -- that yields a universal result.
16688 Qualify_Universal_Operands
(N
, N2
);
16690 E
:= Entity
(Name
(N2
));
16692 if Present
(E
) and then Is_Global
(E
) then
16693 Set_Etype
(N
, Etype
(N2
));
16695 Set_Associated_Node
(N
, Empty
);
16696 Set_Etype
(N
, Empty
);
16699 -- The operator was folded into a literal
16701 elsif Nkind
(N2
) in N_Integer_Literal
16705 if Present
(Original_Node
(N2
))
16706 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
16708 -- Operation was constant-folded. Whenever possible,
16709 -- recover semantic information from unfolded node.
16710 -- This was initially done for ASIS but is apparently
16711 -- needed also for e.g. compiling a-nbnbin.adb.
16713 Set_Associated_Node
(N
, Original_Node
(N2
));
16715 if Nkind
(N
) = N_Op_Concat
then
16716 Set_Is_Component_Left_Opnd
(N
,
16717 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
16718 Set_Is_Component_Right_Opnd
(N
,
16719 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
16724 -- Propagate the constant folding back to the template
16727 Rewrite
(N
, New_Copy
(N2
));
16728 Set_Analyzed
(N
, False);
16731 -- The operator was folded into an enumeration literal. Retain
16732 -- the entity to avoid spurious ambiguities if it is overloaded
16733 -- at the point of instantiation or inlining.
16735 elsif Nkind
(N2
) = N_Identifier
16736 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
16738 Rewrite
(N
, New_Copy
(N2
));
16739 Set_Analyzed
(N
, False);
16743 -- Complete the operands check if node has not been constant
16746 if Nkind
(N
) in N_Op
then
16747 Save_Entity_Descendants
(N
);
16749 end Save_References_In_Operator
;
16751 -------------------------------
16752 -- Save_References_In_Pragma --
16753 -------------------------------
16755 procedure Save_References_In_Pragma
(Prag
: Node_Id
) is
16757 Do_Save
: Boolean := True;
16760 -- Do not save global references in pragmas generated from aspects
16761 -- because the pragmas will be regenerated at instantiation time.
16763 if From_Aspect_Specification
(Prag
) then
16766 -- The capture of global references within contract-related source
16767 -- pragmas associated with generic packages, subprograms or their
16768 -- respective bodies must be delayed due to timing of annotation
16769 -- analysis. Global references are still captured in routine
16770 -- Save_Global_References_In_Contract.
16772 elsif Is_Generic_Contract_Pragma
(Prag
) and then Prag
/= Templ
then
16773 if Is_Package_Contract_Annotation
(Prag
) then
16774 Context
:= Find_Related_Package_Or_Body
(Prag
);
16776 pragma Assert
(Is_Subprogram_Contract_Annotation
(Prag
));
16777 Context
:= Find_Related_Declaration_Or_Body
(Prag
);
16780 -- The use of Original_Node accounts for the case when the
16781 -- related context is generic template.
16783 if Requires_Delayed_Save
(Original_Node
(Context
)) then
16788 -- For all other cases, save all global references within the
16789 -- descendants, but skip the following semantic fields:
16790 -- Next_Pragma, Corresponding_Aspect, Next_Rep_Item.
16793 Save_Global_Descendant
16794 (Union_Id
(Pragma_Argument_Associations
(N
)));
16795 Save_Global_Descendant
(Union_Id
(Pragma_Identifier
(N
)));
16797 end Save_References_In_Pragma
;
16799 -- Start of processing for Save_References
16807 elsif Nkind
(N
) in N_Aggregate | N_Extension_Aggregate
then
16808 Save_References_In_Aggregate
(N
);
16810 -- Character literals, operator symbols
16812 elsif Nkind
(N
) in N_Character_Literal | N_Operator_Symbol
then
16813 Save_References_In_Char_Lit_Or_Op_Symbol
(N
);
16815 -- Defining identifiers
16817 elsif Nkind
(N
) in N_Entity
then
16822 elsif Nkind
(N
) = N_Identifier
then
16823 Save_References_In_Identifier
(N
);
16827 elsif Nkind
(N
) in N_Op
then
16828 Save_References_In_Operator
(N
);
16832 elsif Nkind
(N
) = N_Pragma
then
16833 Save_References_In_Pragma
(N
);
16836 Save_References_In_Descendants
(N
);
16839 -- Save all global references found within the aspect specifications
16840 -- of the related node.
16842 if Permits_Aspect_Specifications
(N
) and then Has_Aspects
(N
) then
16844 -- The capture of global references within aspects associated with
16845 -- generic packages, subprograms or their bodies must be delayed
16846 -- due to timing of annotation analysis. Global references are
16847 -- still captured in routine Save_Global_References_In_Contract.
16849 if Requires_Delayed_Save
(N
) then
16852 -- Otherwise save all global references within the aspects
16855 Save_Global_References_In_Aspects
(N
);
16858 end Save_References
;
16860 -- Start of processing for Save_Global_References
16863 Gen_Scope
:= Current_Scope
;
16865 -- If the generic unit is a child unit, references to entities in the
16866 -- parent are treated as local, because they will be resolved anew in
16867 -- the context of the instance of the parent.
16869 while Is_Child_Unit
(Gen_Scope
)
16870 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
16872 Gen_Scope
:= Scope
(Gen_Scope
);
16875 Save_References
(Templ
);
16876 end Save_Global_References
;
16878 ---------------------------------------
16879 -- Save_Global_References_In_Aspects --
16880 ---------------------------------------
16882 procedure Save_Global_References_In_Aspects
(N
: Node_Id
) is
16887 Asp
:= First
(Aspect_Specifications
(N
));
16888 while Present
(Asp
) loop
16889 Expr
:= Expression
(Asp
);
16891 if Present
(Expr
) then
16892 Save_Global_References
(Expr
);
16897 end Save_Global_References_In_Aspects
;
16899 ------------------------------------------
16900 -- Set_Copied_Sloc_For_Inherited_Pragma --
16901 ------------------------------------------
16903 procedure Set_Copied_Sloc_For_Inherited_Pragma
16908 Create_Instantiation_Source
(N
, E
,
16909 Inlined_Body
=> False,
16910 Inherited_Pragma
=> True,
16911 Factor
=> S_Adjustment
);
16912 end Set_Copied_Sloc_For_Inherited_Pragma
;
16914 --------------------------------------
16915 -- Set_Copied_Sloc_For_Inlined_Body --
16916 --------------------------------------
16918 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
16920 Create_Instantiation_Source
(N
, E
,
16921 Inlined_Body
=> True,
16922 Inherited_Pragma
=> False,
16923 Factor
=> S_Adjustment
);
16924 end Set_Copied_Sloc_For_Inlined_Body
;
16926 ---------------------
16927 -- Set_Instance_Of --
16928 ---------------------
16930 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
16932 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
16933 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
16934 Generic_Renamings
.Increment_Last
;
16935 end Set_Instance_Of
;
16937 --------------------
16938 -- Set_Next_Assoc --
16939 --------------------
16941 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
16943 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
16944 end Set_Next_Assoc
;
16946 -------------------
16947 -- Start_Generic --
16948 -------------------
16950 procedure Start_Generic
is
16952 -- ??? More things could be factored out in this routine.
16953 -- Should probably be done at a later stage.
16955 Generic_Flags
.Append
(Inside_A_Generic
);
16956 Inside_A_Generic
:= True;
16958 Expander_Mode_Save_And_Set
(False);
16961 ----------------------
16962 -- Set_Instance_Env --
16963 ----------------------
16965 -- WARNING: This routine manages SPARK regions
16967 procedure Set_Instance_Env
16968 (Gen_Unit
: Entity_Id
;
16969 Act_Unit
: Entity_Id
)
16971 Saved_AE
: constant Boolean := Assertions_Enabled
;
16972 Saved_CPL
: constant Node_Id
:= Check_Policy_List
;
16973 Saved_DEC
: constant Boolean := Dynamic_Elaboration_Checks
;
16974 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
16975 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
16978 -- Regardless of the current mode, predefined units are analyzed in the
16979 -- most current Ada mode, and earlier version Ada checks do not apply
16980 -- to predefined units. Nothing needs to be done for non-internal units.
16981 -- These are always analyzed in the current mode.
16983 if In_Internal_Unit
(Gen_Unit
) then
16985 -- The following call resets all configuration attributes to default
16986 -- or the xxx_Config versions of the attributes when the current sem
16987 -- unit is the main unit. At the same time, internal units must also
16988 -- inherit certain configuration attributes from their context. It
16989 -- is unclear what these two sets are.
16991 Set_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
16993 -- Reinstall relevant configuration attributes of the context
16995 Assertions_Enabled
:= Saved_AE
;
16996 Check_Policy_List
:= Saved_CPL
;
16997 Dynamic_Elaboration_Checks
:= Saved_DEC
;
16999 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
17002 Current_Instantiated_Parent
:=
17003 (Gen_Id
=> Gen_Unit
,
17004 Act_Id
=> Act_Unit
,
17005 Next_In_HTable
=> Assoc_Null
);
17006 end Set_Instance_Env
;
17012 procedure Switch_View
(T
: Entity_Id
) is
17013 BT
: constant Entity_Id
:= Base_Type
(T
);
17014 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
17015 Priv_Sub
: Entity_Id
;
17018 -- T may be private but its base type may have been exchanged through
17019 -- some other occurrence, in which case there is nothing to switch
17020 -- besides T itself. Note that a private dependent subtype of a private
17021 -- type might not have been switched even if the base type has been,
17022 -- because of the last branch of Check_Private_View (see comment there).
17024 if not Is_Private_Type
(BT
) then
17025 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
17026 Exchange_Declarations
(T
);
17030 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
17032 if Present
(Full_View
(BT
)) then
17033 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
17034 Exchange_Declarations
(BT
);
17037 while Present
(Priv_Elmt
) loop
17038 Priv_Sub
:= Node
(Priv_Elmt
);
17040 if Present
(Full_View
(Priv_Sub
)) then
17041 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
17042 Exchange_Declarations
(Priv_Sub
);
17045 Next_Elmt
(Priv_Elmt
);
17053 function True_Parent
(N
: Node_Id
) return Node_Id
is
17055 if Nkind
(Parent
(N
)) = N_Subunit
then
17056 return Parent
(Corresponding_Stub
(Parent
(N
)));
17062 -----------------------------
17063 -- Valid_Default_Attribute --
17064 -----------------------------
17066 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
17067 Attr_Id
: constant Attribute_Id
:=
17068 Get_Attribute_Id
(Attribute_Name
(Def
));
17069 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
17070 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
17076 if No
(T
) or else T
= Any_Id
then
17081 F
:= First_Formal
(Nam
);
17082 while Present
(F
) loop
17083 Num_F
:= Num_F
+ 1;
17088 when Attribute_Adjacent
17089 | Attribute_Ceiling
17090 | Attribute_Copy_Sign
17092 | Attribute_Fraction
17093 | Attribute_Machine
17095 | Attribute_Remainder
17096 | Attribute_Rounding
17097 | Attribute_Unbiased_Rounding
17101 and then Is_Floating_Point_Type
(T
);
17103 when Attribute_Image
17107 | Attribute_Wide_Image
17108 | Attribute_Wide_Value
17110 OK
:= Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
);
17115 OK
:= Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
);
17117 when Attribute_Input
=>
17118 OK
:= (Is_Fun
and then Num_F
= 1);
17120 when Attribute_Output
17121 | Attribute_Put_Image
17125 OK
:= not Is_Fun
and then Num_F
= 2;
17133 ("attribute reference has wrong profile for subprogram", Def
);
17135 end Valid_Default_Attribute
;
17137 ----------------------------------
17138 -- Validate_Formal_Type_Default --
17139 ----------------------------------
17141 procedure Validate_Formal_Type_Default
(Decl
: Node_Id
) is
17142 Default
: constant Node_Id
:=
17143 Default_Subtype_Mark
(Original_Node
(Decl
));
17144 Formal
: constant Entity_Id
:= Defining_Identifier
(Decl
);
17146 Def_Sub
: Entity_Id
; -- Default subtype mark
17147 Type_Def
: Node_Id
;
17149 procedure Check_Discriminated_Formal
;
17150 -- Check that discriminants of default for private or incomplete
17151 -- type match those of formal type.
17153 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
;
17154 -- Check whether formal type definition mentions a previous formal
17155 -- type of the same generic.
17157 ----------------------
17158 -- Reference_Formal --
17159 ----------------------
17161 function Reference_Formal
(N
: Node_Id
) return Traverse_Result
is
17163 if Is_Entity_Name
(N
)
17164 and then Scope
(Entity
(N
)) = Current_Scope
17170 end Reference_Formal
;
17172 function Depends_On_Other_Formals
is
17173 new Traverse_Func
(Reference_Formal
);
17175 function Default_Subtype_Matches
17176 (Gen_T
, Def_T
: Entity_Id
) return Boolean;
17178 procedure Validate_Array_Type_Default
;
17179 -- Verify that dimension, indices, and component types of default
17180 -- are compatible with formal array type definition.
17182 procedure Validate_Derived_Type_Default
;
17183 -- Verify that ancestor and progenitor types match.
17185 ---------------------------------
17186 -- Check_Discriminated_Formal --
17187 ---------------------------------
17189 procedure Check_Discriminated_Formal
is
17190 Formal_Discr
: Entity_Id
;
17191 Actual_Discr
: Entity_Id
;
17192 Formal_Subt
: Entity_Id
;
17195 if Has_Discriminants
(Formal
) then
17196 if not Has_Discriminants
(Def_Sub
) then
17198 ("default for & must have discriminants", Default
, Formal
);
17200 elsif Is_Constrained
(Def_Sub
) then
17202 ("default for & must be unconstrained", Default
, Formal
);
17205 Formal_Discr
:= First_Discriminant
(Formal
);
17206 Actual_Discr
:= First_Discriminant
(Def_Sub
);
17207 while Formal_Discr
/= Empty
loop
17208 if Actual_Discr
= Empty
then
17210 ("discriminants on Formal do not match formal",
17214 Formal_Subt
:= Etype
(Formal_Discr
);
17216 -- Access discriminants match if designated types do
17218 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
17219 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
17220 E_Anonymous_Access_Type
17222 Designated_Type
(Base_Type
(Formal_Subt
)) =
17223 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
17227 elsif Base_Type
(Formal_Subt
) /=
17228 Base_Type
(Etype
(Actual_Discr
))
17231 ("types of discriminants of default must match formal",
17234 elsif not Subtypes_Statically_Match
17235 (Formal_Subt
, Etype
(Actual_Discr
))
17236 and then Ada_Version
>= Ada_95
17239 ("subtypes of discriminants of default "
17240 & "must match formal",
17244 Next_Discriminant
(Formal_Discr
);
17245 Next_Discriminant
(Actual_Discr
);
17248 if Actual_Discr
/= Empty
then
17250 ("discriminants on default do not match formal",
17255 end Check_Discriminated_Formal
;
17257 ---------------------------
17258 -- Default_Subtype_Matches --
17259 ---------------------------
17261 function Default_Subtype_Matches
17262 (Gen_T
, Def_T
: Entity_Id
) return Boolean
17265 -- Check that the base types, root types (when dealing with class
17266 -- wide types), or designated types (when dealing with anonymous
17267 -- access types) of Gen_T and Def_T are statically matching subtypes.
17269 return (Base_Type
(Gen_T
) = Base_Type
(Def_T
)
17270 and then Subtypes_Statically_Match
(Gen_T
, Def_T
))
17272 or else (Is_Class_Wide_Type
(Gen_T
)
17273 and then Is_Class_Wide_Type
(Def_T
)
17274 and then Default_Subtype_Matches
17275 (Root_Type
(Gen_T
), Root_Type
(Def_T
)))
17277 or else (Is_Anonymous_Access_Type
(Gen_T
)
17278 and then Ekind
(Def_T
) = Ekind
(Gen_T
)
17279 and then Subtypes_Statically_Match
17280 (Designated_Type
(Gen_T
), Designated_Type
(Def_T
)));
17282 end Default_Subtype_Matches
;
17284 ----------------------------------
17285 -- Validate_Array_Type_Default --
17286 ----------------------------------
17288 procedure Validate_Array_Type_Default
is
17292 if not Is_Array_Type
(Def_Sub
) then
17293 Error_Msg_NE
("default for& must be an array type ",
17297 elsif Number_Dimensions
(Def_Sub
) /= Number_Dimensions
(Formal
)
17298 or else Is_Constrained
(Def_Sub
) /=
17299 Is_Constrained
(Formal
)
17301 Error_Msg_NE
("default array type does not match&",
17306 I1
:= First_Index
(Formal
);
17307 I2
:= First_Index
(Def_Sub
);
17308 for J
in 1 .. Number_Dimensions
(Formal
) loop
17310 -- If the indexes of the actual were given by a subtype_mark,
17311 -- the index was transformed into a range attribute. Retrieve
17312 -- the original type mark for checking.
17314 if Is_Entity_Name
(Original_Node
(I2
)) then
17315 T2
:= Entity
(Original_Node
(I2
));
17320 if not Subtypes_Statically_Match
(Etype
(I1
), T2
) then
17322 ("index types of default do not match those of formal &",
17330 if not Default_Subtype_Matches
17331 (Component_Type
(Formal
), Component_Type
(Def_Sub
))
17334 ("component subtype of default does not match that of formal &",
17338 if Has_Aliased_Components
(Formal
)
17339 and then not Has_Aliased_Components
(Default
)
17342 ("default must have aliased components to match formal type &",
17345 end Validate_Array_Type_Default
;
17347 -----------------------------------
17348 -- Validate_Derived_Type_Default --
17349 -----------------------------------
17351 procedure Validate_Derived_Type_Default
is
17353 if not Is_Ancestor
(Etype
(Formal
), Def_Sub
) then
17354 Error_Msg_NE
("default must be a descendent of&",
17355 Default
, Etype
(Formal
));
17358 if Has_Interfaces
(Formal
) then
17359 if not Has_Interfaces
(Def_Sub
) then
17361 ("default must implement all interfaces of formal&",
17366 Act_Iface_List
: Elist_Id
;
17368 Iface_Ent
: Entity_Id
;
17371 Iface
:= First
(Abstract_Interface_List
(Formal
));
17372 Collect_Interfaces
(Def_Sub
, Act_Iface_List
);
17374 while Present
(Iface
) loop
17375 Iface_Ent
:= Entity
(Iface
);
17377 if Is_Ancestor
(Iface_Ent
, Def_Sub
)
17378 or else Is_Progenitor
(Iface_Ent
, Def_Sub
)
17384 ("Default must implement interface&",
17385 Default
, Etype
(Iface
));
17393 end Validate_Derived_Type_Default
;
17395 -- Start of processing for Validate_Formal_Type_Default
17399 if not Is_Entity_Name
(Default
)
17400 or else not Is_Type
(Entity
(Default
))
17403 ("Expect type name for default of formal type", Default
);
17406 Def_Sub
:= Entity
(Default
);
17409 -- Formal derived_type declarations are transformed into full
17410 -- type declarations or Private_Type_Extensions for ease of processing.
17412 if Nkind
(Decl
) = N_Full_Type_Declaration
then
17413 Type_Def
:= Type_Definition
(Decl
);
17415 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
17416 Type_Def
:= Subtype_Indication
(Decl
);
17419 Type_Def
:= Formal_Type_Definition
(Decl
);
17422 if Depends_On_Other_Formals
(Type_Def
) = Abandon
17423 and then Scope
(Def_Sub
) /= Current_Scope
17425 Error_Msg_N
("default of formal type that depends on "
17426 & "other formals must be a previous formal type", Default
);
17429 elsif Def_Sub
= Formal
then
17431 ("default for formal type cannot be formal itsef", Default
);
17435 case Nkind
(Type_Def
) is
17437 when N_Formal_Private_Type_Definition
=>
17438 if (Is_Abstract_Type
(Formal
)
17439 and then not Is_Abstract_Type
(Def_Sub
))
17440 or else (Is_Limited_Type
(Formal
)
17441 and then not Is_Limited_Type
(Def_Sub
))
17444 ("default for private type$ does not match",
17448 Check_Discriminated_Formal
;
17450 when N_Formal_Derived_Type_Definition
=>
17451 Check_Discriminated_Formal
;
17452 Validate_Derived_Type_Default
;
17454 when N_Formal_Incomplete_Type_Definition
=>
17455 if Is_Tagged_Type
(Formal
)
17456 and then not Is_Tagged_Type
(Def_Sub
)
17459 ("default for & must be a tagged type", Default
, Formal
);
17462 Check_Discriminated_Formal
;
17464 when N_Formal_Discrete_Type_Definition
=>
17465 if not Is_Discrete_Type
(Def_Sub
) then
17466 Error_Msg_NE
("default for& must be a discrete type",
17470 when N_Formal_Signed_Integer_Type_Definition
=>
17471 if not Is_Integer_Type
(Def_Sub
) then
17472 Error_Msg_NE
("default for& must be a discrete type",
17476 when N_Formal_Modular_Type_Definition
=>
17477 if not Is_Modular_Integer_Type
(Def_Sub
) then
17478 Error_Msg_NE
("default for& must be a modular_integer Type",
17482 when N_Formal_Floating_Point_Definition
=>
17483 if not Is_Floating_Point_Type
(Def_Sub
) then
17484 Error_Msg_NE
("default for& must be a floating_point type",
17488 when N_Formal_Ordinary_Fixed_Point_Definition
=>
17489 if not Is_Ordinary_Fixed_Point_Type
(Def_Sub
) then
17490 Error_Msg_NE
("default for& must be "
17491 & "an ordinary_fixed_point type ",
17495 when N_Formal_Decimal_Fixed_Point_Definition
=>
17496 if not Is_Decimal_Fixed_Point_Type
(Def_Sub
) then
17497 Error_Msg_NE
("default for& must be "
17498 & "an Decimal_fixed_point type ",
17502 when N_Array_Type_Definition
=>
17503 Validate_Array_Type_Default
;
17505 when N_Access_Function_Definition |
17506 N_Access_Procedure_Definition
=>
17507 if Ekind
(Def_Sub
) /= E_Access_Subprogram_Type
then
17508 Error_Msg_NE
("default for& must be an Access_To_Subprogram",
17511 Check_Subtype_Conformant
17512 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
));
17514 when N_Access_To_Object_Definition
=>
17515 if not Is_Access_Object_Type
(Def_Sub
) then
17516 Error_Msg_NE
("default for& must be an Access_To_Object",
17519 elsif not Default_Subtype_Matches
17520 (Designated_Type
(Formal
), Designated_Type
(Def_Sub
))
17522 Error_Msg_NE
("designated type of defaul does not match "
17523 & "designated type of formal type",
17527 when N_Record_Definition
=> -- Formal interface type
17528 if not Is_Interface
(Def_Sub
) then
17530 ("default for formal interface type must be an interface",
17533 elsif Is_Limited_Type
(Def_Sub
) /= Is_Limited_Type
(Formal
)
17534 or else Is_Task_Interface
(Formal
) /= Is_Task_Interface
(Def_Sub
)
17535 or else Is_Protected_Interface
(Formal
) /=
17536 Is_Protected_Interface
(Def_Sub
)
17537 or else Is_Synchronized_Interface
(Formal
) /=
17538 Is_Synchronized_Interface
(Def_Sub
)
17541 ("default for interface& does not match", Def_Sub
, Formal
);
17544 when N_Derived_Type_Definition
=>
17545 Validate_Derived_Type_Default
;
17547 when N_Identifier
=> -- case of a private extension
17548 Validate_Derived_Type_Default
;
17554 raise Program_Error
;
17556 end Validate_Formal_Type_Default
;