1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. 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 Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Errout
; use Errout
;
32 with Expander
; use Expander
;
33 with Exp_Disp
; use Exp_Disp
;
34 with Fname
; use Fname
;
35 with Fname
.UF
; use Fname
.UF
;
36 with Freeze
; use Freeze
;
37 with Itypes
; use Itypes
;
39 with Lib
.Load
; use Lib
.Load
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Nlists
; use Nlists
;
42 with Namet
; use Namet
;
43 with Nmake
; use Nmake
;
45 with Rident
; use Rident
;
46 with Restrict
; use Restrict
;
47 with Rtsfind
; use Rtsfind
;
49 with Sem_Aux
; use Sem_Aux
;
50 with Sem_Cat
; use Sem_Cat
;
51 with Sem_Ch3
; use Sem_Ch3
;
52 with Sem_Ch6
; use Sem_Ch6
;
53 with Sem_Ch7
; use Sem_Ch7
;
54 with Sem_Ch8
; use Sem_Ch8
;
55 with Sem_Ch10
; use Sem_Ch10
;
56 with Sem_Ch13
; use Sem_Ch13
;
57 with Sem_Dim
; use Sem_Dim
;
58 with Sem_Disp
; use Sem_Disp
;
59 with Sem_Elab
; use Sem_Elab
;
60 with Sem_Elim
; use Sem_Elim
;
61 with Sem_Eval
; use Sem_Eval
;
62 with Sem_Prag
; use Sem_Prag
;
63 with Sem_Res
; use Sem_Res
;
64 with Sem_Type
; use Sem_Type
;
65 with Sem_Util
; use Sem_Util
;
66 with Sem_Warn
; use Sem_Warn
;
67 with Stand
; use Stand
;
68 with Sinfo
; use Sinfo
;
69 with Sinfo
.CN
; use Sinfo
.CN
;
70 with Sinput
; use Sinput
;
71 with Sinput
.L
; use Sinput
.L
;
72 with Snames
; use Snames
;
73 with Stringt
; use Stringt
;
74 with Uname
; use Uname
;
76 with Tbuild
; use Tbuild
;
77 with Uintp
; use Uintp
;
78 with Urealp
; use Urealp
;
79 with Warnsw
; use Warnsw
;
83 package body Sem_Ch12
is
85 ----------------------------------------------------------
86 -- Implementation of Generic Analysis and Instantiation --
87 ----------------------------------------------------------
89 -- GNAT implements generics by macro expansion. No attempt is made to share
90 -- generic instantiations (for now). Analysis of a generic definition does
91 -- not perform any expansion action, but the expander must be called on the
92 -- tree for each instantiation, because the expansion may of course depend
93 -- on the generic actuals. All of this is best achieved as follows:
95 -- a) Semantic analysis of a generic unit is performed on a copy of the
96 -- tree for the generic unit. All tree modifications that follow analysis
97 -- do not affect the original tree. Links are kept between the original
98 -- tree and the copy, in order to recognize non-local references within
99 -- the generic, and propagate them to each instance (recall that name
100 -- resolution is done on the generic declaration: generics are not really
101 -- macros). This is summarized in the following diagram:
103 -- .-----------. .----------.
104 -- | semantic |<--------------| generic |
106 -- | |==============>| |
107 -- |___________| global |__________|
118 -- b) Each instantiation copies the original tree, and inserts into it a
119 -- series of declarations that describe the mapping between generic formals
120 -- and actuals. For example, a generic In OUT parameter is an object
121 -- renaming of the corresponding actual, etc. Generic IN parameters are
122 -- constant declarations.
124 -- c) In order to give the right visibility for these renamings, we use
125 -- a different scheme for package and subprogram instantiations. For
126 -- packages, the list of renamings is inserted into the package
127 -- specification, before the visible declarations of the package. The
128 -- renamings are analyzed before any of the text of the instance, and are
129 -- thus visible at the right place. Furthermore, outside of the instance,
130 -- the generic parameters are visible and denote their corresponding
133 -- For subprograms, we create a container package to hold the renamings
134 -- and the subprogram instance itself. Analysis of the package makes the
135 -- renaming declarations visible to the subprogram. After analyzing the
136 -- package, the defining entity for the subprogram is touched-up so that
137 -- it appears declared in the current scope, and not inside the container
140 -- If the instantiation is a compilation unit, the container package is
141 -- given the same name as the subprogram instance. This ensures that
142 -- the elaboration procedure called by the binder, using the compilation
143 -- unit name, calls in fact the elaboration procedure for the package.
145 -- Not surprisingly, private types complicate this approach. By saving in
146 -- the original generic object the non-local references, we guarantee that
147 -- the proper entities are referenced at the point of instantiation.
148 -- However, for private types, this by itself does not insure that the
149 -- proper VIEW of the entity is used (the full type may be visible at the
150 -- point of generic definition, but not at instantiation, or vice-versa).
151 -- In order to reference the proper view, we special-case any reference
152 -- to private types in the generic object, by saving both views, one in
153 -- the generic and one in the semantic copy. At time of instantiation, we
154 -- check whether the two views are consistent, and exchange declarations if
155 -- necessary, in order to restore the correct visibility. Similarly, if
156 -- the instance view is private when the generic view was not, we perform
157 -- the exchange. After completing the instantiation, we restore the
158 -- current visibility. The flag Has_Private_View marks identifiers in the
159 -- the generic unit that require checking.
161 -- Visibility within nested generic units requires special handling.
162 -- Consider the following scheme:
164 -- type Global is ... -- outside of generic unit.
168 -- type Semi_Global is ... -- global to inner.
171 -- procedure inner (X1 : Global; X2 : Semi_Global);
173 -- procedure in2 is new inner (...); -- 4
176 -- package New_Outer is new Outer (...); -- 2
177 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
179 -- The semantic analysis of Outer captures all occurrences of Global.
180 -- The semantic analysis of Inner (at 1) captures both occurrences of
181 -- Global and Semi_Global.
183 -- At point 2 (instantiation of Outer), we also produce a generic copy
184 -- of Inner, even though Inner is, at that point, not being instantiated.
185 -- (This is just part of the semantic analysis of New_Outer).
187 -- Critically, references to Global within Inner must be preserved, while
188 -- references to Semi_Global should not preserved, because they must now
189 -- resolve to an entity within New_Outer. To distinguish between these, we
190 -- use a global variable, Current_Instantiated_Parent, which is set when
191 -- performing a generic copy during instantiation (at 2). This variable is
192 -- used when performing a generic copy that is not an instantiation, but
193 -- that is nested within one, as the occurrence of 1 within 2. The analysis
194 -- of a nested generic only preserves references that are global to the
195 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
196 -- determine whether a reference is external to the given parent.
198 -- The instantiation at point 3 requires no special treatment. The method
199 -- works as well for further nestings of generic units, but of course the
200 -- variable Current_Instantiated_Parent must be stacked because nested
201 -- instantiations can occur, e.g. the occurrence of 4 within 2.
203 -- The instantiation of package and subprogram bodies is handled in a
204 -- similar manner, except that it is delayed until after semantic
205 -- analysis is complete. In this fashion complex cross-dependencies
206 -- between several package declarations and bodies containing generics
207 -- can be compiled which otherwise would diagnose spurious circularities.
209 -- For example, it is possible to compile two packages A and B that
210 -- have the following structure:
212 -- package A is package B is
213 -- generic ... generic ...
214 -- package G_A is package G_B is
217 -- package body A is package body B is
218 -- package N_B is new G_B (..) package N_A is new G_A (..)
220 -- The table Pending_Instantiations in package Inline is used to keep
221 -- track of body instantiations that are delayed in this manner. Inline
222 -- handles the actual calls to do the body instantiations. This activity
223 -- is part of Inline, since the processing occurs at the same point, and
224 -- for essentially the same reason, as the handling of inlined routines.
226 ----------------------------------------------
227 -- Detection of Instantiation Circularities --
228 ----------------------------------------------
230 -- If we have a chain of instantiations that is circular, this is static
231 -- error which must be detected at compile time. The detection of these
232 -- circularities is carried out at the point that we insert a generic
233 -- instance spec or body. If there is a circularity, then the analysis of
234 -- the offending spec or body will eventually result in trying to load the
235 -- same unit again, and we detect this problem as we analyze the package
236 -- instantiation for the second time.
238 -- At least in some cases after we have detected the circularity, we get
239 -- into trouble if we try to keep going. The following flag is set if a
240 -- circularity is detected, and used to abandon compilation after the
241 -- messages have been posted.
243 Circularity_Detected
: Boolean := False;
244 -- This should really be reset on encountering a new main unit, but in
245 -- practice we are not using multiple main units so it is not critical.
247 --------------------------------------------------
248 -- Formal packages and partial parameterization --
249 --------------------------------------------------
251 -- When compiling a generic, a formal package is a local instantiation. If
252 -- declared with a box, its generic formals are visible in the enclosing
253 -- generic. If declared with a partial list of actuals, those actuals that
254 -- are defaulted (covered by an Others clause, or given an explicit box
255 -- initialization) are also visible in the enclosing generic, while those
256 -- that have a corresponding actual are not.
258 -- In our source model of instantiation, the same visibility must be
259 -- present in the spec and body of an instance: the names of the formals
260 -- that are defaulted must be made visible within the instance, and made
261 -- invisible (hidden) after the instantiation is complete, so that they
262 -- are not accessible outside of the instance.
264 -- In a generic, a formal package is treated like a special instantiation.
265 -- Our Ada 95 compiler handled formals with and without box in different
266 -- ways. With partial parameterization, we use a single model for both.
267 -- We create a package declaration that consists of the specification of
268 -- the generic package, and a set of declarations that map the actuals
269 -- into local renamings, just as we do for bona fide instantiations. For
270 -- defaulted parameters and formals with a box, we copy directly the
271 -- declarations of the formal into this local package. The result is a
272 -- a package whose visible declarations may include generic formals. This
273 -- package is only used for type checking and visibility analysis, and
274 -- never reaches the back-end, so it can freely violate the placement
275 -- rules for generic formal declarations.
277 -- The list of declarations (renamings and copies of formals) is built
278 -- by Analyze_Associations, just as for regular instantiations.
280 -- At the point of instantiation, conformance checking must be applied only
281 -- to those parameters that were specified in the formal. We perform this
282 -- checking by creating another internal instantiation, this one including
283 -- only the renamings and the formals (the rest of the package spec is not
284 -- relevant to conformance checking). We can then traverse two lists: the
285 -- list of actuals in the instance that corresponds to the formal package,
286 -- and the list of actuals produced for this bogus instantiation. We apply
287 -- the conformance rules to those actuals that are not defaulted (i.e.
288 -- which still appear as generic formals.
290 -- When we compile an instance body we must make the right parameters
291 -- visible again. The predicate Is_Generic_Formal indicates which of the
292 -- formals should have its Is_Hidden flag reset.
294 -----------------------
295 -- Local subprograms --
296 -----------------------
298 procedure Abandon_Instantiation
(N
: Node_Id
);
299 pragma No_Return
(Abandon_Instantiation
);
300 -- Posts an error message "instantiation abandoned" at the indicated node
301 -- and then raises the exception Instantiation_Error to do it.
303 procedure Analyze_Formal_Array_Type
304 (T
: in out Entity_Id
;
306 -- A formal array type is treated like an array type declaration, and
307 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
308 -- in-out, because in the case of an anonymous type the entity is
309 -- actually created in the procedure.
311 -- The following procedures treat other kinds of formal parameters
313 procedure Analyze_Formal_Derived_Interface_Type
318 procedure Analyze_Formal_Derived_Type
323 procedure Analyze_Formal_Interface_Type
328 -- The following subprograms create abbreviated declarations for formal
329 -- scalar types. We introduce an anonymous base of the proper class for
330 -- each of them, and define the formals as constrained first subtypes of
331 -- their bases. The bounds are expressions that are non-static in the
334 procedure Analyze_Formal_Decimal_Fixed_Point_Type
335 (T
: Entity_Id
; Def
: Node_Id
);
336 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
337 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
338 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
339 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
340 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
341 (T
: Entity_Id
; Def
: Node_Id
);
343 procedure Analyze_Formal_Private_Type
347 -- Creates a new private type, which does not require completion
349 procedure Analyze_Formal_Incomplete_Type
(T
: Entity_Id
; Def
: Node_Id
);
350 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
352 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
353 -- Analyze generic formal part
355 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
356 -- Create a new access type with the given designated type
358 function Analyze_Associations
361 F_Copy
: List_Id
) return List_Id
;
362 -- At instantiation time, build the list of associations between formals
363 -- and actuals. Each association becomes a renaming declaration for the
364 -- formal entity. F_Copy is the analyzed list of formals in the generic
365 -- copy. It is used to apply legality checks to the actuals. I_Node is the
366 -- instantiation node itself.
368 procedure Analyze_Subprogram_Instantiation
372 procedure Build_Instance_Compilation_Unit_Nodes
376 -- This procedure is used in the case where the generic instance of a
377 -- subprogram body or package body is a library unit. In this case, the
378 -- original library unit node for the generic instantiation must be
379 -- replaced by the resulting generic body, and a link made to a new
380 -- compilation unit node for the generic declaration. The argument N is
381 -- the original generic instantiation. Act_Body and Act_Decl are the body
382 -- and declaration of the instance (either package body and declaration
383 -- nodes or subprogram body and declaration nodes depending on the case).
384 -- On return, the node N has been rewritten with the actual body.
386 procedure Check_Access_Definition
(N
: Node_Id
);
387 -- Subsidiary routine to null exclusion processing. Perform an assertion
388 -- check on Ada version and the presence of an access definition in N.
390 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
391 -- Apply the following to all formal packages in generic associations
393 procedure Check_Formal_Package_Instance
394 (Formal_Pack
: Entity_Id
;
395 Actual_Pack
: Entity_Id
);
396 -- Verify that the actuals of the actual instance match the actuals of
397 -- the template for a formal package that is not declared with a box.
399 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
400 -- If the generic is a local entity and the corresponding body has not
401 -- been seen yet, flag enclosing packages to indicate that it will be
402 -- elaborated after the generic body. Subprograms declared in the same
403 -- package cannot be inlined by the front-end because front-end inlining
404 -- requires a strict linear order of elaboration.
406 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
;
407 -- Check if some association between formals and actuals requires to make
408 -- visible primitives of a tagged type, and make those primitives visible.
409 -- Return the list of primitives whose visibility is modified (to restore
410 -- their visibility later through Restore_Hidden_Primitives). If no
411 -- candidate is found then return No_Elist.
413 procedure Check_Hidden_Child_Unit
415 Gen_Unit
: Entity_Id
;
416 Act_Decl_Id
: Entity_Id
);
417 -- If the generic unit is an implicit child instance within a parent
418 -- instance, we need to make an explicit test that it is not hidden by
419 -- a child instance of the same name and parent.
421 procedure Check_Generic_Actuals
422 (Instance
: Entity_Id
;
423 Is_Formal_Box
: Boolean);
424 -- Similar to previous one. Check the actuals in the instantiation,
425 -- whose views can change between the point of instantiation and the point
426 -- of instantiation of the body. In addition, mark the generic renamings
427 -- as generic actuals, so that they are not compatible with other actuals.
428 -- Recurse on an actual that is a formal package whose declaration has
431 function Contains_Instance_Of
434 N
: Node_Id
) return Boolean;
435 -- Inner is instantiated within the generic Outer. Check whether Inner
436 -- directly or indirectly contains an instance of Outer or of one of its
437 -- parents, in the case of a subunit. Each generic unit holds a list of
438 -- the entities instantiated within (at any depth). This procedure
439 -- determines whether the set of such lists contains a cycle, i.e. an
440 -- illegal circular instantiation.
442 function Denotes_Formal_Package
444 On_Exit
: Boolean := False;
445 Instance
: Entity_Id
:= Empty
) return Boolean;
446 -- Returns True if E is a formal package of an enclosing generic, or
447 -- the actual for such a formal in an enclosing instantiation. If such
448 -- a package is used as a formal in an nested generic, or as an actual
449 -- in a nested instantiation, the visibility of ITS formals should not
450 -- be modified. When called from within Restore_Private_Views, the flag
451 -- On_Exit is true, to indicate that the search for a possible enclosing
452 -- instance should ignore the current one. In that case Instance denotes
453 -- the declaration for which this is an actual. This declaration may be
454 -- an instantiation in the source, or the internal instantiation that
455 -- corresponds to the actual for a formal package.
457 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
458 -- Yields True if N1 and N2 appear in the same compilation unit,
459 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
460 -- traversal of the tree for the unit. Used to determine the placement
461 -- of freeze nodes for instance bodies that may depend on other instances.
463 function Find_Actual_Type
465 Gen_Type
: Entity_Id
) return Entity_Id
;
466 -- When validating the actual types of a child instance, check whether
467 -- the formal is a formal type of the parent unit, and retrieve the current
468 -- actual for it. Typ is the entity in the analyzed formal type declaration
469 -- (component or index type of an array type, or designated type of an
470 -- access formal) and Gen_Type is the enclosing analyzed formal array
471 -- or access type. The desired actual may be a formal of a parent, or may
472 -- be declared in a formal package of a parent. In both cases it is a
473 -- generic actual type because it appears within a visible instance.
474 -- Finally, it may be declared in a parent unit without being a formal
475 -- of that unit, in which case it must be retrieved by visibility.
476 -- Ambiguities may still arise if two homonyms are declared in two formal
477 -- packages, and the prefix of the formal type may be needed to resolve
478 -- the ambiguity in the instance ???
480 function In_Same_Declarative_Part
482 Inst
: Node_Id
) return Boolean;
483 -- True if the instantiation Inst and the given freeze_node F_Node appear
484 -- within the same declarative part, ignoring subunits, but with no inter-
485 -- vening subprograms or concurrent units. Used to find the proper plave
486 -- for the freeze node of an instance, when the generic is declared in a
487 -- previous instance. If predicate is true, the freeze node of the instance
488 -- can be placed after the freeze node of the previous instance, Otherwise
489 -- it has to be placed at the end of the current declarative part.
491 function In_Main_Context
(E
: Entity_Id
) return Boolean;
492 -- Check whether an instantiation is in the context of the main unit.
493 -- Used to determine whether its body should be elaborated to allow
494 -- front-end inlining.
496 procedure Set_Instance_Env
497 (Gen_Unit
: Entity_Id
;
498 Act_Unit
: Entity_Id
);
499 -- Save current instance on saved environment, to be used to determine
500 -- the global status of entities in nested instances. Part of Save_Env.
501 -- called after verifying that the generic unit is legal for the instance,
502 -- The procedure also examines whether the generic unit is a predefined
503 -- unit, in order to set configuration switches accordingly. As a result
504 -- the procedure must be called after analyzing and freezing the actuals.
506 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
507 -- Associate analyzed generic parameter with corresponding
508 -- instance. Used for semantic checks at instantiation time.
510 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
511 -- Traverse the Exchanged_Views list to see if a type was private
512 -- and has already been flipped during this phase of instantiation.
514 procedure Hide_Current_Scope
;
515 -- When instantiating a generic child unit, the parent context must be
516 -- present, but the instance and all entities that may be generated
517 -- must be inserted in the current scope. We leave the current scope
518 -- on the stack, but make its entities invisible to avoid visibility
519 -- problems. This is reversed at the end of the instantiation. This is
520 -- not done for the instantiation of the bodies, which only require the
521 -- instances of the generic parents to be in scope.
523 procedure Install_Body
528 -- If the instantiation happens textually before the body of the generic,
529 -- the instantiation of the body must be analyzed after the generic body,
530 -- and not at the point of instantiation. Such early instantiations can
531 -- happen if the generic and the instance appear in a package declaration
532 -- because the generic body can only appear in the corresponding package
533 -- body. Early instantiations can also appear if generic, instance and
534 -- body are all in the declarative part of a subprogram or entry. Entities
535 -- of packages that are early instantiations are delayed, and their freeze
536 -- node appears after the generic body.
538 procedure Insert_Freeze_Node_For_Instance
541 -- N denotes a package or a subprogram instantiation and F_Node is the
542 -- associated freeze node. Insert the freeze node before the first source
543 -- body which follows immediately after N. If no such body is found, the
544 -- freeze node is inserted at the end of the declarative region which
547 procedure Freeze_Subprogram_Body
548 (Inst_Node
: Node_Id
;
550 Pack_Id
: Entity_Id
);
551 -- The generic body may appear textually after the instance, including
552 -- in the proper body of a stub, or within a different package instance.
553 -- Given that the instance can only be elaborated after the generic, we
554 -- place freeze_nodes for the instance and/or for packages that may enclose
555 -- the instance and the generic, so that the back-end can establish the
556 -- proper order of elaboration.
559 -- Establish environment for subsequent instantiation. Separated from
560 -- Save_Env because data-structures for visibility handling must be
561 -- initialized before call to Check_Generic_Child_Unit.
563 procedure Install_Formal_Packages
(Par
: Entity_Id
);
564 -- Install the visible part of any formal of the parent that is a formal
565 -- package. Note that for the case of a formal package with a box, this
566 -- includes the formal part of the formal package (12.7(10/2)).
568 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
569 -- When compiling an instance of a child unit the parent (which is
570 -- itself an instance) is an enclosing scope that must be made
571 -- immediately visible. This procedure is also used to install the non-
572 -- generic parent of a generic child unit when compiling its body, so
573 -- that full views of types in the parent are made visible.
575 procedure Remove_Parent
(In_Body
: Boolean := False);
576 -- Reverse effect after instantiation of child is complete
578 procedure Install_Hidden_Primitives
579 (Prims_List
: in out Elist_Id
;
582 -- Remove suffix 'P' from hidden primitives of Act_T to match the
583 -- visibility of primitives of Gen_T. The list of primitives to which
584 -- the suffix is removed is added to Prims_List to restore them later.
586 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
587 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
590 procedure Inline_Instance_Body
592 Gen_Unit
: Entity_Id
;
594 -- If front-end inlining is requested, instantiate the package body,
595 -- and preserve the visibility of its compilation unit, to insure
596 -- that successive instantiations succeed.
598 -- The functions Instantiate_XXX perform various legality checks and build
599 -- the declarations for instantiated generic parameters. In all of these
600 -- Formal is the entity in the generic unit, Actual is the entity of
601 -- expression in the generic associations, and Analyzed_Formal is the
602 -- formal in the generic copy, which contains the semantic information to
603 -- be used to validate the actual.
605 function Instantiate_Object
608 Analyzed_Formal
: Node_Id
) return List_Id
;
610 function Instantiate_Type
613 Analyzed_Formal
: Node_Id
;
614 Actual_Decls
: List_Id
) return List_Id
;
616 function Instantiate_Formal_Subprogram
619 Analyzed_Formal
: Node_Id
) return Node_Id
;
621 function Instantiate_Formal_Package
624 Analyzed_Formal
: Node_Id
) return List_Id
;
625 -- If the formal package is declared with a box, special visibility rules
626 -- apply to its formals: they are in the visible part of the package. This
627 -- is true in the declarative region of the formal package, that is to say
628 -- in the enclosing generic or instantiation. For an instantiation, the
629 -- parameters of the formal package are made visible in an explicit step.
630 -- Furthermore, if the actual has a visible USE clause, these formals must
631 -- be made potentially use-visible as well. On exit from the enclosing
632 -- instantiation, the reverse must be done.
634 -- For a formal package declared without a box, there are conformance rules
635 -- that apply to the actuals in the generic declaration and the actuals of
636 -- the actual package in the enclosing instantiation. The simplest way to
637 -- apply these rules is to repeat the instantiation of the formal package
638 -- in the context of the enclosing instance, and compare the generic
639 -- associations of this instantiation with those of the actual package.
640 -- This internal instantiation only needs to contain the renamings of the
641 -- formals: the visible and private declarations themselves need not be
644 -- In Ada 2005, the formal package may be only partially parameterized.
645 -- In that case the visibility step must make visible those actuals whose
646 -- corresponding formals were given with a box. A final complication
647 -- involves inherited operations from formal derived types, which must
648 -- be visible if the type is.
650 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
651 -- Test if given node is in the main unit
653 procedure Load_Parent_Of_Generic
656 Body_Optional
: Boolean := False);
657 -- If the generic appears in a separate non-generic library unit, load the
658 -- corresponding body to retrieve the body of the generic. N is the node
659 -- for the generic instantiation, Spec is the generic package declaration.
661 -- Body_Optional is a flag that indicates that the body is being loaded to
662 -- ensure that temporaries are generated consistently when there are other
663 -- instances in the current declarative part that precede the one being
664 -- loaded. In that case a missing body is acceptable.
666 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
667 -- Add the context clause of the unit containing a generic unit to a
668 -- compilation unit that is, or contains, an instantiation.
670 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
671 -- In order to propagate semantic information back from the analyzed copy
672 -- to the original generic, we maintain links between selected nodes in the
673 -- generic and their corresponding copies. At the end of generic analysis,
674 -- the routine Save_Global_References traverses the generic tree, examines
675 -- the semantic information, and preserves the links to those nodes that
676 -- contain global information. At instantiation, the information from the
677 -- associated node is placed on the new copy, so that name resolution is
680 -- Three kinds of source nodes have associated nodes:
682 -- a) those that can reference (denote) entities, that is identifiers,
683 -- character literals, expanded_names, operator symbols, operators,
684 -- and attribute reference nodes. These nodes have an Entity field
685 -- and are the set of nodes that are in N_Has_Entity.
687 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
689 -- c) selected components (N_Selected_Component)
691 -- For the first class, the associated node preserves the entity if it is
692 -- global. If the generic contains nested instantiations, the associated
693 -- node itself has been recopied, and a chain of them must be followed.
695 -- For aggregates, the associated node allows retrieval of the type, which
696 -- may otherwise not appear in the generic. The view of this type may be
697 -- different between generic and instantiation, and the full view can be
698 -- installed before the instantiation is analyzed. For aggregates of type
699 -- extensions, the same view exchange may have to be performed for some of
700 -- the ancestor types, if their view is private at the point of
703 -- Nodes that are selected components in the parse tree may be rewritten
704 -- as expanded names after resolution, and must be treated as potential
705 -- entity holders, which is why they also have an Associated_Node.
707 -- Nodes that do not come from source, such as freeze nodes, do not appear
708 -- in the generic tree, and need not have an associated node.
710 -- The associated node is stored in the Associated_Node field. Note that
711 -- this field overlaps Entity, which is fine, because the whole point is
712 -- that we don't need or want the normal Entity field in this situation.
714 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
715 -- Within the generic part, entities in the formal package are
716 -- visible. To validate subsequent type declarations, indicate
717 -- the correspondence between the entities in the analyzed formal,
718 -- and the entities in the actual package. There are three packages
719 -- involved in the instantiation of a formal package: the parent
720 -- generic P1 which appears in the generic declaration, the fake
721 -- instantiation P2 which appears in the analyzed generic, and whose
722 -- visible entities may be used in subsequent formals, and the actual
723 -- P3 in the instance. To validate subsequent formals, me indicate
724 -- that the entities in P2 are mapped into those of P3. The mapping of
725 -- entities has to be done recursively for nested packages.
727 procedure Move_Freeze_Nodes
731 -- Freeze nodes can be generated in the analysis of a generic unit, but
732 -- will not be seen by the back-end. It is necessary to move those nodes
733 -- to the enclosing scope if they freeze an outer entity. We place them
734 -- at the end of the enclosing generic package, which is semantically
737 procedure Preanalyze_Actuals
(N
: Node_Id
);
738 -- Analyze actuals to perform name resolution. Full resolution is done
739 -- later, when the expected types are known, but names have to be captured
740 -- before installing parents of generics, that are not visible for the
741 -- actuals themselves.
743 function True_Parent
(N
: Node_Id
) return Node_Id
;
744 -- For a subunit, return parent of corresponding stub, else return
747 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
748 -- Verify that an attribute that appears as the default for a formal
749 -- subprogram is a function or procedure with the correct profile.
751 -------------------------------------------
752 -- Data Structures for Generic Renamings --
753 -------------------------------------------
755 -- The map Generic_Renamings associates generic entities with their
756 -- corresponding actuals. Currently used to validate type instances. It
757 -- will eventually be used for all generic parameters to eliminate the
758 -- need for overload resolution in the instance.
760 type Assoc_Ptr
is new Int
;
762 Assoc_Null
: constant Assoc_Ptr
:= -1;
767 Next_In_HTable
: Assoc_Ptr
;
770 package Generic_Renamings
is new Table
.Table
771 (Table_Component_Type
=> Assoc
,
772 Table_Index_Type
=> Assoc_Ptr
,
773 Table_Low_Bound
=> 0,
775 Table_Increment
=> 100,
776 Table_Name
=> "Generic_Renamings");
778 -- Variable to hold enclosing instantiation. When the environment is
779 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
781 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
783 -- Hash table for associations
785 HTable_Size
: constant := 37;
786 type HTable_Range
is range 0 .. HTable_Size
- 1;
788 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
789 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
790 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
791 function Hash
(F
: Entity_Id
) return HTable_Range
;
793 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
794 Header_Num
=> HTable_Range
,
796 Elmt_Ptr
=> Assoc_Ptr
,
797 Null_Ptr
=> Assoc_Null
,
798 Set_Next
=> Set_Next_Assoc
,
801 Get_Key
=> Get_Gen_Id
,
805 Exchanged_Views
: Elist_Id
;
806 -- This list holds the private views that have been exchanged during
807 -- instantiation to restore the visibility of the generic declaration.
808 -- (see comments above). After instantiation, the current visibility is
809 -- reestablished by means of a traversal of this list.
811 Hidden_Entities
: Elist_Id
;
812 -- This list holds the entities of the current scope that are removed
813 -- from immediate visibility when instantiating a child unit. Their
814 -- visibility is restored in Remove_Parent.
816 -- Because instantiations can be recursive, the following must be saved
817 -- on entry and restored on exit from an instantiation (spec or body).
818 -- This is done by the two procedures Save_Env and Restore_Env. For
819 -- package and subprogram instantiations (but not for the body instances)
820 -- the action of Save_Env is done in two steps: Init_Env is called before
821 -- Check_Generic_Child_Unit, because setting the parent instances requires
822 -- that the visibility data structures be properly initialized. Once the
823 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
825 Parent_Unit_Visible
: Boolean := False;
826 -- Parent_Unit_Visible is used when the generic is a child unit, and
827 -- indicates whether the ultimate parent of the generic is visible in the
828 -- instantiation environment. It is used to reset the visibility of the
829 -- parent at the end of the instantiation (see Remove_Parent).
831 Instance_Parent_Unit
: Entity_Id
:= Empty
;
832 -- This records the ultimate parent unit of an instance of a generic
833 -- child unit and is used in conjunction with Parent_Unit_Visible to
834 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
836 type Instance_Env
is record
837 Instantiated_Parent
: Assoc
;
838 Exchanged_Views
: Elist_Id
;
839 Hidden_Entities
: Elist_Id
;
840 Current_Sem_Unit
: Unit_Number_Type
;
841 Parent_Unit_Visible
: Boolean := False;
842 Instance_Parent_Unit
: Entity_Id
:= Empty
;
843 Switches
: Config_Switches_Type
;
846 package Instance_Envs
is new Table
.Table
(
847 Table_Component_Type
=> Instance_Env
,
848 Table_Index_Type
=> Int
,
849 Table_Low_Bound
=> 0,
851 Table_Increment
=> 100,
852 Table_Name
=> "Instance_Envs");
854 procedure Restore_Private_Views
855 (Pack_Id
: Entity_Id
;
856 Is_Package
: Boolean := True);
857 -- Restore the private views of external types, and unmark the generic
858 -- renamings of actuals, so that they become compatible subtypes again.
859 -- For subprograms, Pack_Id is the package constructed to hold the
862 procedure Switch_View
(T
: Entity_Id
);
863 -- Switch the partial and full views of a type and its private
864 -- dependents (i.e. its subtypes and derived types).
866 ------------------------------------
867 -- Structures for Error Reporting --
868 ------------------------------------
870 Instantiation_Node
: Node_Id
;
871 -- Used by subprograms that validate instantiation of formal parameters
872 -- where there might be no actual on which to place the error message.
873 -- Also used to locate the instantiation node for generic subunits.
875 Instantiation_Error
: exception;
876 -- When there is a semantic error in the generic parameter matching,
877 -- there is no point in continuing the instantiation, because the
878 -- number of cascaded errors is unpredictable. This exception aborts
879 -- the instantiation process altogether.
881 S_Adjustment
: Sloc_Adjustment
;
882 -- Offset created for each node in an instantiation, in order to keep
883 -- track of the source position of the instantiation in each of its nodes.
884 -- A subsequent semantic error or warning on a construct of the instance
885 -- points to both places: the original generic node, and the point of
886 -- instantiation. See Sinput and Sinput.L for additional details.
888 ------------------------------------------------------------
889 -- Data structure for keeping track when inside a Generic --
890 ------------------------------------------------------------
892 -- The following table is used to save values of the Inside_A_Generic
893 -- flag (see spec of Sem) when they are saved by Start_Generic.
895 package Generic_Flags
is new Table
.Table
(
896 Table_Component_Type
=> Boolean,
897 Table_Index_Type
=> Int
,
898 Table_Low_Bound
=> 0,
900 Table_Increment
=> 200,
901 Table_Name
=> "Generic_Flags");
903 ---------------------------
904 -- Abandon_Instantiation --
905 ---------------------------
907 procedure Abandon_Instantiation
(N
: Node_Id
) is
909 Error_Msg_N
("\instantiation abandoned!", N
);
910 raise Instantiation_Error
;
911 end Abandon_Instantiation
;
913 --------------------------
914 -- Analyze_Associations --
915 --------------------------
917 function Analyze_Associations
920 F_Copy
: List_Id
) return List_Id
922 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
923 Assoc
: constant List_Id
:= New_List
;
924 Default_Actuals
: constant Elist_Id
:= New_Elmt_List
;
925 Gen_Unit
: constant Entity_Id
:=
926 Defining_Entity
(Parent
(F_Copy
));
930 Analyzed_Formal
: Node_Id
;
931 First_Named
: Node_Id
:= Empty
;
935 Saved_Formal
: Node_Id
;
937 Default_Formals
: constant List_Id
:= New_List
;
938 -- If an Others_Choice is present, some of the formals may be defaulted.
939 -- To simplify the treatment of visibility in an instance, we introduce
940 -- individual defaults for each such formal. These defaults are
941 -- appended to the list of associations and replace the Others_Choice.
943 Found_Assoc
: Node_Id
;
944 -- Association for the current formal being match. Empty if there are
945 -- no remaining actuals, or if there is no named association with the
946 -- name of the formal.
948 Is_Named_Assoc
: Boolean;
949 Num_Matched
: Int
:= 0;
950 Num_Actuals
: Int
:= 0;
952 Others_Present
: Boolean := False;
953 Others_Choice
: Node_Id
:= Empty
;
954 -- In Ada 2005, indicates partial parameterization of a formal
955 -- package. As usual an other association must be last in the list.
957 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
);
958 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
959 -- cannot have a named association for it. AI05-0025 extends this rule
960 -- to formals of formal packages by AI05-0025, and it also applies to
961 -- box-initialized formals.
963 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
964 -- Determine whether the parameter types and the return type of Subp
965 -- are fully defined at the point of instantiation.
967 function Matching_Actual
969 A_F
: Entity_Id
) return Node_Id
;
970 -- Find actual that corresponds to a given a formal parameter. If the
971 -- actuals are positional, return the next one, if any. If the actuals
972 -- are named, scan the parameter associations to find the right one.
973 -- A_F is the corresponding entity in the analyzed generic,which is
974 -- placed on the selector name for ASIS use.
976 -- In Ada 2005, a named association may be given with a box, in which
977 -- case Matching_Actual sets Found_Assoc to the generic association,
978 -- but return Empty for the actual itself. In this case the code below
979 -- creates a corresponding declaration for the formal.
981 function Partial_Parameterization
return Boolean;
982 -- Ada 2005: if no match is found for a given formal, check if the
983 -- association for it includes a box, or whether the associations
984 -- include an Others clause.
986 procedure Process_Default
(F
: Entity_Id
);
987 -- Add a copy of the declaration of generic formal F to the list of
988 -- associations, and add an explicit box association for F if there
989 -- is none yet, and the default comes from an Others_Choice.
991 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
992 -- Determine whether Subp renames one of the subprograms defined in the
993 -- generated package Standard.
995 procedure Set_Analyzed_Formal
;
996 -- Find the node in the generic copy that corresponds to a given formal.
997 -- The semantic information on this node is used to perform legality
998 -- checks on the actuals. Because semantic analysis can introduce some
999 -- anonymous entities or modify the declaration node itself, the
1000 -- correspondence between the two lists is not one-one. In addition to
1001 -- anonymous types, the presence a formal equality will introduce an
1002 -- implicit declaration for the corresponding inequality.
1004 ----------------------------------------
1005 -- Check_Overloaded_Formal_Subprogram --
1006 ----------------------------------------
1008 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
) is
1009 Temp_Formal
: Entity_Id
;
1012 Temp_Formal
:= First
(Formals
);
1013 while Present
(Temp_Formal
) loop
1014 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1015 and then Temp_Formal
/= Formal
1017 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1018 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1020 if Present
(Found_Assoc
) then
1022 ("named association not allowed for overloaded formal",
1027 ("named association not allowed for overloaded formal",
1031 Abandon_Instantiation
(Instantiation_Node
);
1036 end Check_Overloaded_Formal_Subprogram
;
1038 -------------------------------
1039 -- Has_Fully_Defined_Profile --
1040 -------------------------------
1042 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1043 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1044 -- Determine whethet type Typ is fully defined
1046 ---------------------------
1047 -- Is_Fully_Defined_Type --
1048 ---------------------------
1050 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1052 -- A private type without a full view is not fully defined
1054 if Is_Private_Type
(Typ
)
1055 and then No
(Full_View
(Typ
))
1059 -- An incomplete type is never fully defined
1061 elsif Is_Incomplete_Type
(Typ
) then
1064 -- All other types are fully defined
1069 end Is_Fully_Defined_Type
;
1071 -- Local declarations
1075 -- Start of processing for Has_Fully_Defined_Profile
1078 -- Check the parameters
1080 Param
:= First_Formal
(Subp
);
1081 while Present
(Param
) loop
1082 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1086 Next_Formal
(Param
);
1089 -- Check the return type
1091 return Is_Fully_Defined_Type
(Etype
(Subp
));
1092 end Has_Fully_Defined_Profile
;
1094 ---------------------
1095 -- Matching_Actual --
1096 ---------------------
1098 function Matching_Actual
1100 A_F
: Entity_Id
) return Node_Id
1106 Is_Named_Assoc
:= False;
1108 -- End of list of purely positional parameters
1110 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1111 Found_Assoc
:= Empty
;
1114 -- Case of positional parameter corresponding to current formal
1116 elsif No
(Selector_Name
(Actual
)) then
1117 Found_Assoc
:= Actual
;
1118 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1119 Num_Matched
:= Num_Matched
+ 1;
1122 -- Otherwise scan list of named actuals to find the one with the
1123 -- desired name. All remaining actuals have explicit names.
1126 Is_Named_Assoc
:= True;
1127 Found_Assoc
:= Empty
;
1131 while Present
(Actual
) loop
1132 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1133 Set_Entity
(Selector_Name
(Actual
), A_F
);
1134 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1135 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1136 Found_Assoc
:= Actual
;
1137 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1138 Num_Matched
:= Num_Matched
+ 1;
1146 -- Reset for subsequent searches. In most cases the named
1147 -- associations are in order. If they are not, we reorder them
1148 -- to avoid scanning twice the same actual. This is not just a
1149 -- question of efficiency: there may be multiple defaults with
1150 -- boxes that have the same name. In a nested instantiation we
1151 -- insert actuals for those defaults, and cannot rely on their
1152 -- names to disambiguate them.
1154 if Actual
= First_Named
then
1157 elsif Present
(Actual
) then
1158 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1161 Actual
:= First_Named
;
1164 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1165 Set_Used_As_Generic_Actual
(Entity
(Act
));
1169 end Matching_Actual
;
1171 ------------------------------
1172 -- Partial_Parameterization --
1173 ------------------------------
1175 function Partial_Parameterization
return Boolean is
1177 return Others_Present
1178 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1179 end Partial_Parameterization
;
1181 ---------------------
1182 -- Process_Default --
1183 ---------------------
1185 procedure Process_Default
(F
: Entity_Id
) is
1186 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1187 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1193 -- Append copy of formal declaration to associations, and create new
1194 -- defining identifier for it.
1196 Decl
:= New_Copy_Tree
(F
);
1197 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1199 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1200 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1203 Set_Defining_Identifier
(Decl
, Id
);
1206 Append
(Decl
, Assoc
);
1208 if No
(Found_Assoc
) then
1210 Make_Generic_Association
(Loc
,
1211 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
),
1212 Explicit_Generic_Actual_Parameter
=> Empty
);
1213 Set_Box_Present
(Default
);
1214 Append
(Default
, Default_Formals
);
1216 end Process_Default
;
1218 ---------------------------------
1219 -- Renames_Standard_Subprogram --
1220 ---------------------------------
1222 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1227 while Present
(Id
) loop
1228 if Scope
(Id
) = Standard_Standard
then
1236 end Renames_Standard_Subprogram
;
1238 -------------------------
1239 -- Set_Analyzed_Formal --
1240 -------------------------
1242 procedure Set_Analyzed_Formal
is
1246 while Present
(Analyzed_Formal
) loop
1247 Kind
:= Nkind
(Analyzed_Formal
);
1249 case Nkind
(Formal
) is
1251 when N_Formal_Subprogram_Declaration
=>
1252 exit when Kind
in N_Formal_Subprogram_Declaration
1255 (Defining_Unit_Name
(Specification
(Formal
))) =
1257 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1259 when N_Formal_Package_Declaration
=>
1260 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1261 N_Generic_Package_Declaration
,
1262 N_Package_Declaration
);
1264 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
1268 -- Skip freeze nodes, and nodes inserted to replace
1269 -- unrecognized pragmas.
1272 Kind
not in N_Formal_Subprogram_Declaration
1273 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1277 and then Chars
(Defining_Identifier
(Formal
)) =
1278 Chars
(Defining_Identifier
(Analyzed_Formal
));
1281 Next
(Analyzed_Formal
);
1283 end Set_Analyzed_Formal
;
1285 -- Start of processing for Analyze_Associations
1288 Actuals
:= Generic_Associations
(I_Node
);
1290 if Present
(Actuals
) then
1292 -- Check for an Others choice, indicating a partial parameterization
1293 -- for a formal package.
1295 Actual
:= First
(Actuals
);
1296 while Present
(Actual
) loop
1297 if Nkind
(Actual
) = N_Others_Choice
then
1298 Others_Present
:= True;
1299 Others_Choice
:= Actual
;
1301 if Present
(Next
(Actual
)) then
1302 Error_Msg_N
("others must be last association", Actual
);
1305 -- This subprogram is used both for formal packages and for
1306 -- instantiations. For the latter, associations must all be
1309 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1310 and then Comes_From_Source
(I_Node
)
1313 ("others association not allowed in an instance",
1317 -- In any case, nothing to do after the others association
1321 elsif Box_Present
(Actual
)
1322 and then Comes_From_Source
(I_Node
)
1323 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1326 ("box association not allowed in an instance", Actual
);
1332 -- If named associations are present, save first named association
1333 -- (it may of course be Empty) to facilitate subsequent name search.
1335 First_Named
:= First
(Actuals
);
1336 while Present
(First_Named
)
1337 and then Nkind
(First_Named
) /= N_Others_Choice
1338 and then No
(Selector_Name
(First_Named
))
1340 Num_Actuals
:= Num_Actuals
+ 1;
1345 Named
:= First_Named
;
1346 while Present
(Named
) loop
1347 if Nkind
(Named
) /= N_Others_Choice
1348 and then No
(Selector_Name
(Named
))
1350 Error_Msg_N
("invalid positional actual after named one", Named
);
1351 Abandon_Instantiation
(Named
);
1354 -- A named association may lack an actual parameter, if it was
1355 -- introduced for a default subprogram that turns out to be local
1356 -- to the outer instantiation.
1358 if Nkind
(Named
) /= N_Others_Choice
1359 and then Present
(Explicit_Generic_Actual_Parameter
(Named
))
1361 Num_Actuals
:= Num_Actuals
+ 1;
1367 if Present
(Formals
) then
1368 Formal
:= First_Non_Pragma
(Formals
);
1369 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1371 if Present
(Actuals
) then
1372 Actual
:= First
(Actuals
);
1374 -- All formals should have default values
1380 while Present
(Formal
) loop
1381 Set_Analyzed_Formal
;
1382 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1384 case Nkind
(Formal
) is
1385 when N_Formal_Object_Declaration
=>
1388 Defining_Identifier
(Formal
),
1389 Defining_Identifier
(Analyzed_Formal
));
1391 if No
(Match
) and then Partial_Parameterization
then
1392 Process_Default
(Formal
);
1395 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1399 when N_Formal_Type_Declaration
=>
1402 Defining_Identifier
(Formal
),
1403 Defining_Identifier
(Analyzed_Formal
));
1406 if Partial_Parameterization
then
1407 Process_Default
(Formal
);
1410 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1414 Defining_Identifier
(Formal
));
1415 Error_Msg_NE
("\in instantiation of & declared#",
1416 Instantiation_Node
, Gen_Unit
);
1417 Abandon_Instantiation
(Instantiation_Node
);
1424 (Formal
, Match
, Analyzed_Formal
, Assoc
),
1427 -- An instantiation is a freeze point for the actuals,
1428 -- unless this is a rewritten formal package, or the
1429 -- formal is an Ada 2012 formal incomplete type.
1431 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1433 (Ada_Version
>= Ada_2012
1435 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1441 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1445 -- A remote access-to-class-wide type is not a legal actual
1446 -- for a generic formal of an access type (E.2.2(17/2)).
1447 -- In GNAT an exception to this rule is introduced when
1448 -- the formal is marked as remote using implementation
1449 -- defined aspect/pragma Remote_Access_Type. In that case
1450 -- the actual must be remote as well.
1452 -- If the current instantiation is the construction of a
1453 -- local copy for a formal package the actuals may be
1454 -- defaulted, and there is no matching actual to check.
1456 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1458 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1459 N_Access_To_Object_Definition
1460 and then Present
(Match
)
1463 Formal_Ent
: constant Entity_Id
:=
1464 Defining_Identifier
(Analyzed_Formal
);
1466 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1467 = Is_Remote_Types
(Formal_Ent
)
1469 -- Remoteness of formal and actual match
1473 elsif Is_Remote_Types
(Formal_Ent
) then
1475 -- Remote formal, non-remote actual
1478 ("actual for& must be remote", Match
, Formal_Ent
);
1481 -- Non-remote formal, remote actual
1484 ("actual for& may not be remote",
1490 when N_Formal_Subprogram_Declaration
=>
1493 (Defining_Unit_Name
(Specification
(Formal
)),
1494 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1496 -- If the formal subprogram has the same name as another
1497 -- formal subprogram of the generic, then a named
1498 -- association is illegal (12.3(9)). Exclude named
1499 -- associations that are generated for a nested instance.
1502 and then Is_Named_Assoc
1503 and then Comes_From_Source
(Found_Assoc
)
1505 Check_Overloaded_Formal_Subprogram
(Formal
);
1508 -- If there is no corresponding actual, this may be case
1509 -- of partial parameterization, or else the formal has a
1510 -- default or a box.
1512 if No
(Match
) and then Partial_Parameterization
then
1513 Process_Default
(Formal
);
1515 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1516 Check_Overloaded_Formal_Subprogram
(Formal
);
1521 Instantiate_Formal_Subprogram
1522 (Formal
, Match
, Analyzed_Formal
));
1524 -- An instantiation is a freeze point for the actuals,
1525 -- unless this is a rewritten formal package.
1527 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1528 and then Nkind
(Match
) = N_Identifier
1529 and then Is_Subprogram
(Entity
(Match
))
1531 -- The actual subprogram may rename a routine defined
1532 -- in Standard. Avoid freezing such renamings because
1533 -- subprograms coming from Standard cannot be frozen.
1536 not Renames_Standard_Subprogram
(Entity
(Match
))
1538 -- If the actual subprogram comes from a different
1539 -- unit, it is already frozen, either by a body in
1540 -- that unit or by the end of the declarative part
1541 -- of the unit. This check avoids the freezing of
1542 -- subprograms defined in Standard which are used
1543 -- as generic actuals.
1545 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1546 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1548 -- Mark the subprogram as having a delayed freeze
1549 -- since this may be an out-of-order action.
1551 Set_Has_Delayed_Freeze
(Entity
(Match
));
1552 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1556 -- If this is a nested generic, preserve default for later
1560 and then Box_Present
(Formal
)
1563 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1567 when N_Formal_Package_Declaration
=>
1570 Defining_Identifier
(Formal
),
1571 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1574 if Partial_Parameterization
then
1575 Process_Default
(Formal
);
1578 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1581 Instantiation_Node
, Defining_Identifier
(Formal
));
1582 Error_Msg_NE
("\in instantiation of & declared#",
1583 Instantiation_Node
, Gen_Unit
);
1585 Abandon_Instantiation
(Instantiation_Node
);
1591 (Instantiate_Formal_Package
1592 (Formal
, Match
, Analyzed_Formal
),
1596 -- For use type and use package appearing in the generic part,
1597 -- we have already copied them, so we can just move them where
1598 -- they belong (we mustn't recopy them since this would mess up
1599 -- the Sloc values).
1601 when N_Use_Package_Clause |
1602 N_Use_Type_Clause
=>
1603 if Nkind
(Original_Node
(I_Node
)) =
1604 N_Formal_Package_Declaration
1606 Append
(New_Copy_Tree
(Formal
), Assoc
);
1609 Append
(Formal
, Assoc
);
1613 raise Program_Error
;
1617 Formal
:= Saved_Formal
;
1618 Next_Non_Pragma
(Analyzed_Formal
);
1621 if Num_Actuals
> Num_Matched
then
1622 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1624 if Present
(Selector_Name
(Actual
)) then
1626 ("unmatched actual&",
1627 Actual
, Selector_Name
(Actual
));
1628 Error_Msg_NE
("\in instantiation of& declared#",
1632 ("unmatched actual in instantiation of& declared#",
1637 elsif Present
(Actuals
) then
1639 ("too many actuals in generic instantiation", Instantiation_Node
);
1642 -- An instantiation freezes all generic actuals. The only exceptions
1643 -- to this are incomplete types and subprograms which are not fully
1644 -- defined at the point of instantiation.
1647 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
1649 while Present
(Elmt
) loop
1650 Freeze_Before
(I_Node
, Node
(Elmt
));
1655 -- If there are default subprograms, normalize the tree by adding
1656 -- explicit associations for them. This is required if the instance
1657 -- appears within a generic.
1665 Elmt
:= First_Elmt
(Default_Actuals
);
1666 while Present
(Elmt
) loop
1667 if No
(Actuals
) then
1668 Actuals
:= New_List
;
1669 Set_Generic_Associations
(I_Node
, Actuals
);
1672 Subp
:= Node
(Elmt
);
1674 Make_Generic_Association
(Sloc
(Subp
),
1675 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1676 Explicit_Generic_Actual_Parameter
=>
1677 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1678 Mark_Rewrite_Insertion
(New_D
);
1679 Append_To
(Actuals
, New_D
);
1684 -- If this is a formal package, normalize the parameter list by adding
1685 -- explicit box associations for the formals that are covered by an
1688 if not Is_Empty_List
(Default_Formals
) then
1689 Append_List
(Default_Formals
, Formals
);
1693 end Analyze_Associations
;
1695 -------------------------------
1696 -- Analyze_Formal_Array_Type --
1697 -------------------------------
1699 procedure Analyze_Formal_Array_Type
1700 (T
: in out Entity_Id
;
1706 -- Treated like a non-generic array declaration, with additional
1711 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1712 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1713 while Present
(DSS
) loop
1714 if Nkind_In
(DSS
, N_Subtype_Indication
,
1716 N_Attribute_Reference
)
1718 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1725 Array_Type_Declaration
(T
, Def
);
1726 Set_Is_Generic_Type
(Base_Type
(T
));
1728 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1729 and then No
(Full_View
(Component_Type
(T
)))
1731 Error_Msg_N
("premature usage of incomplete type", Def
);
1733 -- Check that range constraint is not allowed on the component type
1734 -- of a generic formal array type (AARM 12.5.3(3))
1736 elsif Is_Internal
(Component_Type
(T
))
1737 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1738 and then Nkind
(Original_Node
1739 (Subtype_Indication
(Component_Definition
(Def
)))) =
1740 N_Subtype_Indication
1743 ("in a formal, a subtype indication can only be "
1744 & "a subtype mark (RM 12.5.3(3))",
1745 Subtype_Indication
(Component_Definition
(Def
)));
1748 end Analyze_Formal_Array_Type
;
1750 ---------------------------------------------
1751 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1752 ---------------------------------------------
1754 -- As for other generic types, we create a valid type representation with
1755 -- legal but arbitrary attributes, whose values are never considered
1756 -- static. For all scalar types we introduce an anonymous base type, with
1757 -- the same attributes. We choose the corresponding integer type to be
1758 -- Standard_Integer.
1759 -- Here and in other similar routines, the Sloc of the generated internal
1760 -- type must be the same as the sloc of the defining identifier of the
1761 -- formal type declaration, to provide proper source navigation.
1763 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1767 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1769 Base
: constant Entity_Id
:=
1771 (E_Decimal_Fixed_Point_Type
,
1773 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
1775 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1776 Delta_Val
: constant Ureal
:= Ureal_1
;
1777 Digs_Val
: constant Uint
:= Uint_6
;
1782 Set_Etype
(Base
, Base
);
1783 Set_Size_Info
(Base
, Int_Base
);
1784 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1785 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1786 Set_Digits_Value
(Base
, Digs_Val
);
1787 Set_Delta_Value
(Base
, Delta_Val
);
1788 Set_Small_Value
(Base
, Delta_Val
);
1789 Set_Scalar_Range
(Base
,
1791 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1792 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1794 Set_Is_Generic_Type
(Base
);
1795 Set_Parent
(Base
, Parent
(Def
));
1797 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1798 Set_Etype
(T
, Base
);
1799 Set_Size_Info
(T
, Int_Base
);
1800 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1801 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1802 Set_Digits_Value
(T
, Digs_Val
);
1803 Set_Delta_Value
(T
, Delta_Val
);
1804 Set_Small_Value
(T
, Delta_Val
);
1805 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1806 Set_Is_Constrained
(T
);
1808 Check_Restriction
(No_Fixed_Point
, Def
);
1809 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1811 -------------------------------------------
1812 -- Analyze_Formal_Derived_Interface_Type --
1813 -------------------------------------------
1815 procedure Analyze_Formal_Derived_Interface_Type
1820 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1823 -- Rewrite as a type declaration of a derived type. This ensures that
1824 -- the interface list and primitive operations are properly captured.
1827 Make_Full_Type_Declaration
(Loc
,
1828 Defining_Identifier
=> T
,
1829 Type_Definition
=> Def
));
1831 Set_Is_Generic_Type
(T
);
1832 end Analyze_Formal_Derived_Interface_Type
;
1834 ---------------------------------
1835 -- Analyze_Formal_Derived_Type --
1836 ---------------------------------
1838 procedure Analyze_Formal_Derived_Type
1843 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1844 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1848 Set_Is_Generic_Type
(T
);
1850 if Private_Present
(Def
) then
1852 Make_Private_Extension_Declaration
(Loc
,
1853 Defining_Identifier
=> T
,
1854 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1855 Unknown_Discriminants_Present
=> Unk_Disc
,
1856 Subtype_Indication
=> Subtype_Mark
(Def
),
1857 Interface_List
=> Interface_List
(Def
));
1859 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1860 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
1861 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
1865 Make_Full_Type_Declaration
(Loc
,
1866 Defining_Identifier
=> T
,
1867 Discriminant_Specifications
=>
1868 Discriminant_Specifications
(Parent
(T
)),
1870 Make_Derived_Type_Definition
(Loc
,
1871 Subtype_Indication
=> Subtype_Mark
(Def
)));
1873 Set_Abstract_Present
1874 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1876 (Type_Definition
(New_N
), Limited_Present
(Def
));
1883 if not Is_Composite_Type
(T
) then
1885 ("unknown discriminants not allowed for elementary types", N
);
1887 Set_Has_Unknown_Discriminants
(T
);
1888 Set_Is_Constrained
(T
, False);
1892 -- If the parent type has a known size, so does the formal, which makes
1893 -- legal representation clauses that involve the formal.
1895 Set_Size_Known_At_Compile_Time
1896 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1897 end Analyze_Formal_Derived_Type
;
1899 ----------------------------------
1900 -- Analyze_Formal_Discrete_Type --
1901 ----------------------------------
1903 -- The operations defined for a discrete types are those of an enumeration
1904 -- type. The size is set to an arbitrary value, for use in analyzing the
1907 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1908 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1912 Base
: constant Entity_Id
:=
1914 (E_Floating_Point_Type
, Current_Scope
,
1915 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
1919 Set_Ekind
(T
, E_Enumeration_Subtype
);
1920 Set_Etype
(T
, Base
);
1923 Set_Is_Generic_Type
(T
);
1924 Set_Is_Constrained
(T
);
1926 -- For semantic analysis, the bounds of the type must be set to some
1927 -- non-static value. The simplest is to create attribute nodes for those
1928 -- bounds, that refer to the type itself. These bounds are never
1929 -- analyzed but serve as place-holders.
1932 Make_Attribute_Reference
(Loc
,
1933 Attribute_Name
=> Name_First
,
1934 Prefix
=> New_Occurrence_Of
(T
, Loc
));
1938 Make_Attribute_Reference
(Loc
,
1939 Attribute_Name
=> Name_Last
,
1940 Prefix
=> New_Occurrence_Of
(T
, Loc
));
1943 Set_Scalar_Range
(T
,
1948 Set_Ekind
(Base
, E_Enumeration_Type
);
1949 Set_Etype
(Base
, Base
);
1950 Init_Size
(Base
, 8);
1951 Init_Alignment
(Base
);
1952 Set_Is_Generic_Type
(Base
);
1953 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1954 Set_Parent
(Base
, Parent
(Def
));
1955 end Analyze_Formal_Discrete_Type
;
1957 ----------------------------------
1958 -- Analyze_Formal_Floating_Type --
1959 ---------------------------------
1961 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1962 Base
: constant Entity_Id
:=
1964 (E_Floating_Point_Type
, Current_Scope
,
1965 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
1968 -- The various semantic attributes are taken from the predefined type
1969 -- Float, just so that all of them are initialized. Their values are
1970 -- never used because no constant folding or expansion takes place in
1971 -- the generic itself.
1974 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1975 Set_Etype
(T
, Base
);
1976 Set_Size_Info
(T
, (Standard_Float
));
1977 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1978 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1979 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1980 Set_Is_Constrained
(T
);
1982 Set_Is_Generic_Type
(Base
);
1983 Set_Etype
(Base
, Base
);
1984 Set_Size_Info
(Base
, (Standard_Float
));
1985 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1986 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1987 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1988 Set_Parent
(Base
, Parent
(Def
));
1990 Check_Restriction
(No_Floating_Point
, Def
);
1991 end Analyze_Formal_Floating_Type
;
1993 -----------------------------------
1994 -- Analyze_Formal_Interface_Type;--
1995 -----------------------------------
1997 procedure Analyze_Formal_Interface_Type
2002 Loc
: constant Source_Ptr
:= Sloc
(N
);
2007 Make_Full_Type_Declaration
(Loc
,
2008 Defining_Identifier
=> T
,
2009 Type_Definition
=> Def
);
2013 Set_Is_Generic_Type
(T
);
2014 end Analyze_Formal_Interface_Type
;
2016 ---------------------------------
2017 -- Analyze_Formal_Modular_Type --
2018 ---------------------------------
2020 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2022 -- Apart from their entity kind, generic modular types are treated like
2023 -- signed integer types, and have the same attributes.
2025 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2026 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
2027 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2029 end Analyze_Formal_Modular_Type
;
2031 ---------------------------------------
2032 -- Analyze_Formal_Object_Declaration --
2033 ---------------------------------------
2035 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2036 E
: constant Node_Id
:= Default_Expression
(N
);
2037 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2044 -- Determine the mode of the formal object
2046 if Out_Present
(N
) then
2047 K
:= E_Generic_In_Out_Parameter
;
2049 if not In_Present
(N
) then
2050 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2054 K
:= E_Generic_In_Parameter
;
2057 if Present
(Subtype_Mark
(N
)) then
2058 Find_Type
(Subtype_Mark
(N
));
2059 T
:= Entity
(Subtype_Mark
(N
));
2061 -- Verify that there is no redundant null exclusion
2063 if Null_Exclusion_Present
(N
) then
2064 if not Is_Access_Type
(T
) then
2066 ("null exclusion can only apply to an access type", N
);
2068 elsif Can_Never_Be_Null
(T
) then
2070 ("`NOT NULL` not allowed (& already excludes null)",
2075 -- Ada 2005 (AI-423): Formal object with an access definition
2078 Check_Access_Definition
(N
);
2079 T
:= Access_Definition
2081 N
=> Access_Definition
(N
));
2084 if Ekind
(T
) = E_Incomplete_Type
then
2086 Error_Node
: Node_Id
;
2089 if Present
(Subtype_Mark
(N
)) then
2090 Error_Node
:= Subtype_Mark
(N
);
2092 Check_Access_Definition
(N
);
2093 Error_Node
:= Access_Definition
(N
);
2096 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2100 if K
= E_Generic_In_Parameter
then
2102 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2104 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2106 ("generic formal of mode IN must not be of limited type", N
);
2107 Explain_Limited_Type
(T
, N
);
2110 if Is_Abstract_Type
(T
) then
2112 ("generic formal of mode IN must not be of abstract type", N
);
2116 Preanalyze_Spec_Expression
(E
, T
);
2118 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2120 ("initialization not allowed for limited types", E
);
2121 Explain_Limited_Type
(T
, E
);
2128 -- Case of generic IN OUT parameter
2131 -- If the formal has an unconstrained type, construct its actual
2132 -- subtype, as is done for subprogram formals. In this fashion, all
2133 -- its uses can refer to specific bounds.
2138 if (Is_Array_Type
(T
)
2139 and then not Is_Constrained
(T
))
2141 (Ekind
(T
) = E_Record_Type
2142 and then Has_Discriminants
(T
))
2145 Non_Freezing_Ref
: constant Node_Id
:=
2146 New_Occurrence_Of
(Id
, Sloc
(Id
));
2150 -- Make sure the actual subtype doesn't generate bogus freezing
2152 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2153 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2154 Insert_Before_And_Analyze
(N
, Decl
);
2155 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2158 Set_Actual_Subtype
(Id
, T
);
2163 ("initialization not allowed for `IN OUT` formals", N
);
2167 if Has_Aspects
(N
) then
2168 Analyze_Aspect_Specifications
(N
, Id
);
2170 end Analyze_Formal_Object_Declaration
;
2172 ----------------------------------------------
2173 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2174 ----------------------------------------------
2176 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2180 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2181 Base
: constant Entity_Id
:=
2183 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2184 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2187 -- The semantic attributes are set for completeness only, their values
2188 -- will never be used, since all properties of the type are non-static.
2191 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2192 Set_Etype
(T
, Base
);
2193 Set_Size_Info
(T
, Standard_Integer
);
2194 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2195 Set_Small_Value
(T
, Ureal_1
);
2196 Set_Delta_Value
(T
, Ureal_1
);
2197 Set_Scalar_Range
(T
,
2199 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2200 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2201 Set_Is_Constrained
(T
);
2203 Set_Is_Generic_Type
(Base
);
2204 Set_Etype
(Base
, Base
);
2205 Set_Size_Info
(Base
, Standard_Integer
);
2206 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2207 Set_Small_Value
(Base
, Ureal_1
);
2208 Set_Delta_Value
(Base
, Ureal_1
);
2209 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2210 Set_Parent
(Base
, Parent
(Def
));
2212 Check_Restriction
(No_Fixed_Point
, Def
);
2213 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2215 ----------------------------------------
2216 -- Analyze_Formal_Package_Declaration --
2217 ----------------------------------------
2219 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2220 Loc
: constant Source_Ptr
:= Sloc
(N
);
2221 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2223 Gen_Id
: constant Node_Id
:= Name
(N
);
2225 Gen_Unit
: Entity_Id
;
2227 Parent_Installed
: Boolean := False;
2229 Parent_Instance
: Entity_Id
;
2230 Renaming_In_Par
: Entity_Id
;
2231 Associations
: Boolean := True;
2233 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2234 -- List of primitives made temporarily visible in the instantiation
2235 -- to match the visibility of the formal type
2237 function Build_Local_Package
return Node_Id
;
2238 -- The formal package is rewritten so that its parameters are replaced
2239 -- with corresponding declarations. For parameters with bona fide
2240 -- associations these declarations are created by Analyze_Associations
2241 -- as for a regular instantiation. For boxed parameters, we preserve
2242 -- the formal declarations and analyze them, in order to introduce
2243 -- entities of the right kind in the environment of the formal.
2245 -------------------------
2246 -- Build_Local_Package --
2247 -------------------------
2249 function Build_Local_Package
return Node_Id
is
2251 Pack_Decl
: Node_Id
;
2254 -- Within the formal, the name of the generic package is a renaming
2255 -- of the formal (as for a regular instantiation).
2258 Make_Package_Declaration
(Loc
,
2261 (Specification
(Original_Node
(Gen_Decl
)),
2262 Empty
, Instantiating
=> True));
2264 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
2265 Defining_Unit_Name
=>
2266 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2267 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2269 if Nkind
(Gen_Id
) = N_Identifier
2270 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2273 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2276 -- If the formal is declared with a box, or with an others choice,
2277 -- create corresponding declarations for all entities in the formal
2278 -- part, so that names with the proper types are available in the
2279 -- specification of the formal package.
2281 -- On the other hand, if there are no associations, then all the
2282 -- formals must have defaults, and this will be checked by the
2283 -- call to Analyze_Associations.
2286 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2289 Formal_Decl
: Node_Id
;
2292 -- TBA : for a formal package, need to recurse ???
2297 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2298 while Present
(Formal_Decl
) loop
2300 (Decls
, Copy_Generic_Node
(Formal_Decl
, Empty
, True));
2305 -- If generic associations are present, use Analyze_Associations to
2306 -- create the proper renaming declarations.
2310 Act_Tree
: constant Node_Id
:=
2312 (Original_Node
(Gen_Decl
), Empty
,
2313 Instantiating
=> True);
2316 Generic_Renamings
.Set_Last
(0);
2317 Generic_Renamings_HTable
.Reset
;
2318 Instantiation_Node
:= N
;
2321 Analyze_Associations
2322 (I_Node
=> Original_Node
(N
),
2323 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2324 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2326 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2330 Append
(Renaming
, To
=> Decls
);
2332 -- Add generated declarations ahead of local declarations in
2335 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2336 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2339 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2344 end Build_Local_Package
;
2346 -- Start of processing for Analyze_Formal_Package_Declaration
2349 Text_IO_Kludge
(Gen_Id
);
2352 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2353 Gen_Unit
:= Entity
(Gen_Id
);
2355 -- Check for a formal package that is a package renaming
2357 if Present
(Renamed_Object
(Gen_Unit
)) then
2359 -- Indicate that unit is used, before replacing it with renamed
2360 -- entity for use below.
2362 if In_Extended_Main_Source_Unit
(N
) then
2363 Set_Is_Instantiated
(Gen_Unit
);
2364 Generate_Reference
(Gen_Unit
, N
);
2367 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2370 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2371 Error_Msg_N
("expect generic package name", Gen_Id
);
2375 elsif Gen_Unit
= Current_Scope
then
2377 ("generic package cannot be used as a formal package of itself",
2382 elsif In_Open_Scopes
(Gen_Unit
) then
2383 if Is_Compilation_Unit
(Gen_Unit
)
2384 and then Is_Child_Unit
(Current_Scope
)
2386 -- Special-case the error when the formal is a parent, and
2387 -- continue analysis to minimize cascaded errors.
2390 ("generic parent cannot be used as formal package "
2391 & "of a child unit",
2396 ("generic package cannot be used as a formal package "
2404 -- Check that name of formal package does not hide name of generic,
2405 -- or its leading prefix. This check must be done separately because
2406 -- the name of the generic has already been analyzed.
2409 Gen_Name
: Entity_Id
;
2413 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
2414 Gen_Name
:= Prefix
(Gen_Name
);
2417 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
2419 ("& is hidden within declaration of formal package",
2425 or else No
(Generic_Associations
(N
))
2426 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2428 Associations
:= False;
2431 -- If there are no generic associations, the generic parameters appear
2432 -- as local entities and are instantiated like them. We copy the generic
2433 -- package declaration as if it were an instantiation, and analyze it
2434 -- like a regular package, except that we treat the formals as
2435 -- additional visible components.
2437 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2439 if In_Extended_Main_Source_Unit
(N
) then
2440 Set_Is_Instantiated
(Gen_Unit
);
2441 Generate_Reference
(Gen_Unit
, N
);
2444 Formal
:= New_Copy
(Pack_Id
);
2445 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2448 -- Make local generic without formals. The formals will be replaced
2449 -- with internal declarations.
2451 New_N
:= Build_Local_Package
;
2453 -- If there are errors in the parameter list, Analyze_Associations
2454 -- raises Instantiation_Error. Patch the declaration to prevent
2455 -- further exception propagation.
2458 when Instantiation_Error
=>
2460 Enter_Name
(Formal
);
2461 Set_Ekind
(Formal
, E_Variable
);
2462 Set_Etype
(Formal
, Any_Type
);
2463 Restore_Hidden_Primitives
(Vis_Prims_List
);
2465 if Parent_Installed
then
2473 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2474 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2475 Set_Instance_Env
(Gen_Unit
, Formal
);
2476 Set_Is_Generic_Instance
(Formal
);
2478 Enter_Name
(Formal
);
2479 Set_Ekind
(Formal
, E_Package
);
2480 Set_Etype
(Formal
, Standard_Void_Type
);
2481 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2482 Push_Scope
(Formal
);
2484 if Is_Child_Unit
(Gen_Unit
)
2485 and then Parent_Installed
2487 -- Similarly, we have to make the name of the formal visible in the
2488 -- parent instance, to resolve properly fully qualified names that
2489 -- may appear in the generic unit. The parent instance has been
2490 -- placed on the scope stack ahead of the current scope.
2492 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2495 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2496 Set_Ekind
(Renaming_In_Par
, E_Package
);
2497 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2498 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2499 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2500 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2501 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2504 Analyze
(Specification
(N
));
2506 -- The formals for which associations are provided are not visible
2507 -- outside of the formal package. The others are still declared by a
2508 -- formal parameter declaration.
2510 -- If there are no associations, the only local entity to hide is the
2511 -- generated package renaming itself.
2517 E
:= First_Entity
(Formal
);
2518 while Present
(E
) loop
2520 and then not Is_Generic_Formal
(E
)
2525 if Ekind
(E
) = E_Package
2526 and then Renamed_Entity
(E
) = Formal
2536 End_Package_Scope
(Formal
);
2537 Restore_Hidden_Primitives
(Vis_Prims_List
);
2539 if Parent_Installed
then
2545 -- Inside the generic unit, the formal package is a regular package, but
2546 -- no body is needed for it. Note that after instantiation, the defining
2547 -- unit name we need is in the new tree and not in the original (see
2548 -- Package_Instantiation). A generic formal package is an instance, and
2549 -- can be used as an actual for an inner instance.
2551 Set_Has_Completion
(Formal
, True);
2553 -- Add semantic information to the original defining identifier.
2556 Set_Ekind
(Pack_Id
, E_Package
);
2557 Set_Etype
(Pack_Id
, Standard_Void_Type
);
2558 Set_Scope
(Pack_Id
, Scope
(Formal
));
2559 Set_Has_Completion
(Pack_Id
, True);
2562 if Has_Aspects
(N
) then
2563 Analyze_Aspect_Specifications
(N
, Pack_Id
);
2565 end Analyze_Formal_Package_Declaration
;
2567 ---------------------------------
2568 -- Analyze_Formal_Private_Type --
2569 ---------------------------------
2571 procedure Analyze_Formal_Private_Type
2577 New_Private_Type
(N
, T
, Def
);
2579 -- Set the size to an arbitrary but legal value
2581 Set_Size_Info
(T
, Standard_Integer
);
2582 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2583 end Analyze_Formal_Private_Type
;
2585 ------------------------------------
2586 -- Analyze_Formal_Incomplete_Type --
2587 ------------------------------------
2589 procedure Analyze_Formal_Incomplete_Type
2595 Set_Ekind
(T
, E_Incomplete_Type
);
2597 Set_Private_Dependents
(T
, New_Elmt_List
);
2599 if Tagged_Present
(Def
) then
2600 Set_Is_Tagged_Type
(T
);
2601 Make_Class_Wide_Type
(T
);
2602 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
2604 end Analyze_Formal_Incomplete_Type
;
2606 ----------------------------------------
2607 -- Analyze_Formal_Signed_Integer_Type --
2608 ----------------------------------------
2610 procedure Analyze_Formal_Signed_Integer_Type
2614 Base
: constant Entity_Id
:=
2616 (E_Signed_Integer_Type
,
2618 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2623 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
2624 Set_Etype
(T
, Base
);
2625 Set_Size_Info
(T
, Standard_Integer
);
2626 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2627 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
2628 Set_Is_Constrained
(T
);
2630 Set_Is_Generic_Type
(Base
);
2631 Set_Size_Info
(Base
, Standard_Integer
);
2632 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2633 Set_Etype
(Base
, Base
);
2634 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
2635 Set_Parent
(Base
, Parent
(Def
));
2636 end Analyze_Formal_Signed_Integer_Type
;
2638 -------------------------------------------
2639 -- Analyze_Formal_Subprogram_Declaration --
2640 -------------------------------------------
2642 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
2643 Spec
: constant Node_Id
:= Specification
(N
);
2644 Def
: constant Node_Id
:= Default_Name
(N
);
2645 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2653 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
2654 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
2658 Analyze_Subprogram_Declaration
(N
);
2659 Set_Is_Formal_Subprogram
(Nam
);
2660 Set_Has_Completion
(Nam
);
2662 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
2663 Set_Is_Abstract_Subprogram
(Nam
);
2664 Set_Is_Dispatching_Operation
(Nam
);
2667 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
2669 if No
(Ctrl_Type
) then
2671 ("abstract formal subprogram must have a controlling type",
2674 elsif Ada_Version
>= Ada_2012
2675 and then Is_Incomplete_Type
(Ctrl_Type
)
2678 ("controlling type of abstract formal subprogram cannot " &
2679 "be incomplete type", N
, Ctrl_Type
);
2682 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
2687 -- Default name is resolved at the point of instantiation
2689 if Box_Present
(N
) then
2692 -- Else default is bound at the point of generic declaration
2694 elsif Present
(Def
) then
2695 if Nkind
(Def
) = N_Operator_Symbol
then
2696 Find_Direct_Name
(Def
);
2698 elsif Nkind
(Def
) /= N_Attribute_Reference
then
2702 -- For an attribute reference, analyze the prefix and verify
2703 -- that it has the proper profile for the subprogram.
2705 Analyze
(Prefix
(Def
));
2706 Valid_Default_Attribute
(Nam
, Def
);
2710 -- Default name may be overloaded, in which case the interpretation
2711 -- with the correct profile must be selected, as for a renaming.
2712 -- If the definition is an indexed component, it must denote a
2713 -- member of an entry family. If it is a selected component, it
2714 -- can be a protected operation.
2716 if Etype
(Def
) = Any_Type
then
2719 elsif Nkind
(Def
) = N_Selected_Component
then
2720 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
2721 Error_Msg_N
("expect valid subprogram name as default", Def
);
2724 elsif Nkind
(Def
) = N_Indexed_Component
then
2725 if Is_Entity_Name
(Prefix
(Def
)) then
2726 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
2727 Error_Msg_N
("expect valid subprogram name as default", Def
);
2730 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
2731 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
2734 Error_Msg_N
("expect valid subprogram name as default", Def
);
2738 Error_Msg_N
("expect valid subprogram name as default", Def
);
2742 elsif Nkind
(Def
) = N_Character_Literal
then
2744 -- Needs some type checks: subprogram should be parameterless???
2746 Resolve
(Def
, (Etype
(Nam
)));
2748 elsif not Is_Entity_Name
(Def
)
2749 or else not Is_Overloadable
(Entity
(Def
))
2751 Error_Msg_N
("expect valid subprogram name as default", Def
);
2754 elsif not Is_Overloaded
(Def
) then
2755 Subp
:= Entity
(Def
);
2758 Error_Msg_N
("premature usage of formal subprogram", Def
);
2760 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
2761 Error_Msg_N
("no visible entity matches specification", Def
);
2764 -- More than one interpretation, so disambiguate as for a renaming
2769 I1
: Interp_Index
:= 0;
2775 Get_First_Interp
(Def
, I
, It
);
2776 while Present
(It
.Nam
) loop
2777 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
2778 if Subp
/= Any_Id
then
2779 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
2781 if It1
= No_Interp
then
2782 Error_Msg_N
("ambiguous default subprogram", Def
);
2795 Get_Next_Interp
(I
, It
);
2799 if Subp
/= Any_Id
then
2801 -- Subprogram found, generate reference to it
2803 Set_Entity
(Def
, Subp
);
2804 Generate_Reference
(Subp
, Def
);
2807 Error_Msg_N
("premature usage of formal subprogram", Def
);
2809 elsif Ekind
(Subp
) /= E_Operator
then
2810 Check_Mode_Conformant
(Subp
, Nam
);
2814 Error_Msg_N
("no visible subprogram matches specification", N
);
2820 if Has_Aspects
(N
) then
2821 Analyze_Aspect_Specifications
(N
, Nam
);
2824 end Analyze_Formal_Subprogram_Declaration
;
2826 -------------------------------------
2827 -- Analyze_Formal_Type_Declaration --
2828 -------------------------------------
2830 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
2831 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
2835 T
:= Defining_Identifier
(N
);
2837 if Present
(Discriminant_Specifications
(N
))
2838 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2841 ("discriminants not allowed for this formal type", T
);
2844 -- Enter the new name, and branch to specific routine
2847 when N_Formal_Private_Type_Definition
=>
2848 Analyze_Formal_Private_Type
(N
, T
, Def
);
2850 when N_Formal_Derived_Type_Definition
=>
2851 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2853 when N_Formal_Incomplete_Type_Definition
=>
2854 Analyze_Formal_Incomplete_Type
(T
, Def
);
2856 when N_Formal_Discrete_Type_Definition
=>
2857 Analyze_Formal_Discrete_Type
(T
, Def
);
2859 when N_Formal_Signed_Integer_Type_Definition
=>
2860 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2862 when N_Formal_Modular_Type_Definition
=>
2863 Analyze_Formal_Modular_Type
(T
, Def
);
2865 when N_Formal_Floating_Point_Definition
=>
2866 Analyze_Formal_Floating_Type
(T
, Def
);
2868 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2869 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2871 when N_Formal_Decimal_Fixed_Point_Definition
=>
2872 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2874 when N_Array_Type_Definition
=>
2875 Analyze_Formal_Array_Type
(T
, Def
);
2877 when N_Access_To_Object_Definition |
2878 N_Access_Function_Definition |
2879 N_Access_Procedure_Definition
=>
2880 Analyze_Generic_Access_Type
(T
, Def
);
2882 -- Ada 2005: a interface declaration is encoded as an abstract
2883 -- record declaration or a abstract type derivation.
2885 when N_Record_Definition
=>
2886 Analyze_Formal_Interface_Type
(N
, T
, Def
);
2888 when N_Derived_Type_Definition
=>
2889 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
2895 raise Program_Error
;
2899 Set_Is_Generic_Type
(T
);
2901 if Has_Aspects
(N
) then
2902 Analyze_Aspect_Specifications
(N
, T
);
2904 end Analyze_Formal_Type_Declaration
;
2906 ------------------------------------
2907 -- Analyze_Function_Instantiation --
2908 ------------------------------------
2910 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2912 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2913 end Analyze_Function_Instantiation
;
2915 ---------------------------------
2916 -- Analyze_Generic_Access_Type --
2917 ---------------------------------
2919 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2923 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2924 Access_Type_Declaration
(T
, Def
);
2926 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2927 and then No
(Full_View
(Designated_Type
(T
)))
2928 and then not Is_Generic_Type
(Designated_Type
(T
))
2930 Error_Msg_N
("premature usage of incomplete type", Def
);
2932 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
2934 ("only a subtype mark is allowed in a formal", Def
);
2938 Access_Subprogram_Declaration
(T
, Def
);
2940 end Analyze_Generic_Access_Type
;
2942 ---------------------------------
2943 -- Analyze_Generic_Formal_Part --
2944 ---------------------------------
2946 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2947 Gen_Parm_Decl
: Node_Id
;
2950 -- The generic formals are processed in the scope of the generic unit,
2951 -- where they are immediately visible. The scope is installed by the
2954 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2956 while Present
(Gen_Parm_Decl
) loop
2957 Analyze
(Gen_Parm_Decl
);
2958 Next
(Gen_Parm_Decl
);
2961 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2962 end Analyze_Generic_Formal_Part
;
2964 ------------------------------------------
2965 -- Analyze_Generic_Package_Declaration --
2966 ------------------------------------------
2968 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2969 Loc
: constant Source_Ptr
:= Sloc
(N
);
2972 Save_Parent
: Node_Id
;
2974 Decls
: constant List_Id
:=
2975 Visible_Declarations
(Specification
(N
));
2979 Check_SPARK_Restriction
("generic is not allowed", N
);
2981 -- We introduce a renaming of the enclosing package, to have a usable
2982 -- entity as the prefix of an expanded name for a local entity of the
2983 -- form Par.P.Q, where P is the generic package. This is because a local
2984 -- entity named P may hide it, so that the usual visibility rules in
2985 -- the instance will not resolve properly.
2988 Make_Package_Renaming_Declaration
(Loc
,
2989 Defining_Unit_Name
=>
2990 Make_Defining_Identifier
(Loc
,
2991 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2992 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2994 if Present
(Decls
) then
2995 Decl
:= First
(Decls
);
2996 while Present
(Decl
)
2997 and then Nkind
(Decl
) = N_Pragma
3002 if Present
(Decl
) then
3003 Insert_Before
(Decl
, Renaming
);
3005 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3009 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3012 -- Create copy of generic unit, and save for instantiation. If the unit
3013 -- is a child unit, do not copy the specifications for the parent, which
3014 -- are not part of the generic tree.
3016 Save_Parent
:= Parent_Spec
(N
);
3017 Set_Parent_Spec
(N
, Empty
);
3019 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3020 Set_Parent_Spec
(New_N
, Save_Parent
);
3023 -- Once the contents of the generic copy and the template are swapped,
3024 -- do the same for their respective aspect specifications.
3026 Exchange_Aspects
(N
, New_N
);
3027 Id
:= Defining_Entity
(N
);
3028 Generate_Definition
(Id
);
3030 -- Expansion is not applied to generic units
3035 Set_Ekind
(Id
, E_Generic_Package
);
3036 Set_Etype
(Id
, Standard_Void_Type
);
3037 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
3039 -- Analyze aspects now, so that generated pragmas appear in the
3040 -- declarations before building and analyzing the generic copy.
3042 if Has_Aspects
(N
) then
3043 Analyze_Aspect_Specifications
(N
, Id
);
3047 Enter_Generic_Scope
(Id
);
3048 Set_Inner_Instances
(Id
, New_Elmt_List
);
3050 Set_Categorization_From_Pragmas
(N
);
3051 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3053 -- Link the declaration of the generic homonym in the generic copy to
3054 -- the package it renames, so that it is always resolved properly.
3056 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3057 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3059 -- For a library unit, we have reconstructed the entity for the unit,
3060 -- and must reset it in the library tables.
3062 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3063 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3066 Analyze_Generic_Formal_Part
(N
);
3068 -- After processing the generic formals, analysis proceeds as for a
3069 -- non-generic package.
3071 Analyze
(Specification
(N
));
3073 Validate_Categorization_Dependency
(N
, Id
);
3077 End_Package_Scope
(Id
);
3078 Exit_Generic_Scope
(Id
);
3080 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3081 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3082 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3083 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3086 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3087 Validate_RT_RAT_Component
(N
);
3089 -- If this is a spec without a body, check that generic parameters
3092 if not Body_Required
(Parent
(N
)) then
3093 Check_References
(Id
);
3096 end Analyze_Generic_Package_Declaration
;
3098 --------------------------------------------
3099 -- Analyze_Generic_Subprogram_Declaration --
3100 --------------------------------------------
3102 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3107 Result_Type
: Entity_Id
;
3108 Save_Parent
: Node_Id
;
3112 Check_SPARK_Restriction
("generic is not allowed", N
);
3114 -- Create copy of generic unit, and save for instantiation. If the unit
3115 -- is a child unit, do not copy the specifications for the parent, which
3116 -- are not part of the generic tree.
3118 Save_Parent
:= Parent_Spec
(N
);
3119 Set_Parent_Spec
(N
, Empty
);
3121 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3122 Set_Parent_Spec
(New_N
, Save_Parent
);
3125 Check_SPARK_Mode_In_Generic
(N
);
3127 -- The aspect specifications are not attached to the tree, and must
3128 -- be copied and attached to the generic copy explicitly.
3130 if Present
(Aspect_Specifications
(New_N
)) then
3132 Aspects
: constant List_Id
:= Aspect_Specifications
(N
);
3134 Set_Has_Aspects
(N
, False);
3135 Move_Aspects
(New_N
, To
=> N
);
3136 Set_Has_Aspects
(Original_Node
(N
), False);
3137 Set_Aspect_Specifications
(Original_Node
(N
), Aspects
);
3141 Spec
:= Specification
(N
);
3142 Id
:= Defining_Entity
(Spec
);
3143 Generate_Definition
(Id
);
3144 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
3146 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3148 ("operator symbol not allowed for generic subprogram", Id
);
3155 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3157 Enter_Generic_Scope
(Id
);
3158 Set_Inner_Instances
(Id
, New_Elmt_List
);
3159 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3161 Analyze_Generic_Formal_Part
(N
);
3163 Formals
:= Parameter_Specifications
(Spec
);
3165 if Present
(Formals
) then
3166 Process_Formals
(Formals
, Spec
);
3169 if Nkind
(Spec
) = N_Function_Specification
then
3170 Set_Ekind
(Id
, E_Generic_Function
);
3172 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3173 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3174 Set_Etype
(Id
, Result_Type
);
3176 -- Check restriction imposed by AI05-073: a generic function
3177 -- cannot return an abstract type or an access to such.
3179 -- This is a binding interpretation should it apply to earlier
3180 -- versions of Ada as well as Ada 2012???
3182 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
3183 and then Ada_Version
>= Ada_2012
3185 Error_Msg_N
("generic function cannot have an access result"
3186 & " that designates an abstract type", Spec
);
3190 Find_Type
(Result_Definition
(Spec
));
3191 Typ
:= Entity
(Result_Definition
(Spec
));
3193 if Is_Abstract_Type
(Typ
)
3194 and then Ada_Version
>= Ada_2012
3197 ("generic function cannot have abstract result type", Spec
);
3200 -- If a null exclusion is imposed on the result type, then create
3201 -- a null-excluding itype (an access subtype) and use it as the
3202 -- function's Etype.
3204 if Is_Access_Type
(Typ
)
3205 and then Null_Exclusion_Present
(Spec
)
3208 Create_Null_Excluding_Itype
3210 Related_Nod
=> Spec
,
3211 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3213 Set_Etype
(Id
, Typ
);
3218 Set_Ekind
(Id
, E_Generic_Procedure
);
3219 Set_Etype
(Id
, Standard_Void_Type
);
3222 -- For a library unit, we have reconstructed the entity for the unit,
3223 -- and must reset it in the library tables. We also make sure that
3224 -- Body_Required is set properly in the original compilation unit node.
3226 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3227 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3228 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3231 Set_Categorization_From_Pragmas
(N
);
3232 Validate_Categorization_Dependency
(N
, Id
);
3234 Save_Global_References
(Original_Node
(N
));
3236 -- For ASIS purposes, convert any postcondition, precondition pragmas
3237 -- into aspects, if N is not a compilation unit by itself, in order to
3238 -- enable the analysis of expressions inside the corresponding PPC
3241 if ASIS_Mode
and then Is_List_Member
(N
) then
3242 Make_Aspect_For_PPC_In_Gen_Sub_Decl
(N
);
3245 -- To capture global references, analyze the expressions of aspects,
3246 -- and propagate information to original tree. Note that in this case
3247 -- analysis of attributes is not delayed until the freeze point.
3249 -- It seems very hard to recreate the proper visibility of the generic
3250 -- subprogram at a later point because the analysis of an aspect may
3251 -- create pragmas after the generic copies have been made ???
3253 if Has_Aspects
(N
) then
3258 Aspect
:= First
(Aspect_Specifications
(N
));
3259 while Present
(Aspect
) loop
3260 if Get_Aspect_Id
(Aspect
) /= Aspect_Warnings
3261 and then Present
(Expression
(Aspect
))
3263 Analyze
(Expression
(Aspect
));
3269 Aspect
:= First
(Aspect_Specifications
(Original_Node
(N
)));
3270 while Present
(Aspect
) loop
3271 if Present
(Expression
(Aspect
)) then
3272 Save_Global_References
(Expression
(Aspect
));
3282 Exit_Generic_Scope
(Id
);
3283 Generate_Reference_To_Formals
(Id
);
3285 List_Inherited_Pre_Post_Aspects
(Id
);
3286 end Analyze_Generic_Subprogram_Declaration
;
3288 -----------------------------------
3289 -- Analyze_Package_Instantiation --
3290 -----------------------------------
3292 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
3293 Loc
: constant Source_Ptr
:= Sloc
(N
);
3294 Gen_Id
: constant Node_Id
:= Name
(N
);
3297 Act_Decl_Name
: Node_Id
;
3298 Act_Decl_Id
: Entity_Id
;
3303 Gen_Unit
: Entity_Id
;
3305 Is_Actual_Pack
: constant Boolean :=
3306 Is_Internal
(Defining_Entity
(N
));
3308 Env_Installed
: Boolean := False;
3309 Parent_Installed
: Boolean := False;
3310 Renaming_List
: List_Id
;
3311 Unit_Renaming
: Node_Id
;
3312 Needs_Body
: Boolean;
3313 Inline_Now
: Boolean := False;
3315 Save_Style_Check
: constant Boolean := Style_Check
;
3316 -- Save style check mode for restore on exit
3318 procedure Delay_Descriptors
(E
: Entity_Id
);
3319 -- Delay generation of subprogram descriptors for given entity
3321 function Might_Inline_Subp
return Boolean;
3322 -- If inlining is active and the generic contains inlined subprograms,
3323 -- we instantiate the body. This may cause superfluous instantiations,
3324 -- but it is simpler than detecting the need for the body at the point
3325 -- of inlining, when the context of the instance is not available.
3327 function Must_Inline_Subp
return Boolean;
3328 -- If inlining is active and the generic contains inlined subprograms,
3329 -- return True if some of the inlined subprograms must be inlined by
3332 -----------------------
3333 -- Delay_Descriptors --
3334 -----------------------
3336 procedure Delay_Descriptors
(E
: Entity_Id
) is
3338 if not Delay_Subprogram_Descriptors
(E
) then
3339 Set_Delay_Subprogram_Descriptors
(E
);
3340 Pending_Descriptor
.Append
(E
);
3342 end Delay_Descriptors
;
3344 -----------------------
3345 -- Might_Inline_Subp --
3346 -----------------------
3348 function Might_Inline_Subp
return Boolean is
3352 if not Inline_Processing_Required
then
3356 E
:= First_Entity
(Gen_Unit
);
3357 while Present
(E
) loop
3358 if Is_Subprogram
(E
)
3359 and then Is_Inlined
(E
)
3369 end Might_Inline_Subp
;
3371 ----------------------
3372 -- Must_Inline_Subp --
3373 ----------------------
3375 function Must_Inline_Subp
return Boolean is
3379 if not Inline_Processing_Required
then
3383 E
:= First_Entity
(Gen_Unit
);
3384 while Present
(E
) loop
3385 if Is_Subprogram
(E
)
3386 and then Is_Inlined
(E
)
3387 and then Must_Inline
(E
)
3397 end Must_Inline_Subp
;
3399 -- Local declarations
3401 Vis_Prims_List
: Elist_Id
:= No_Elist
;
3402 -- List of primitives made temporarily visible in the instantiation
3403 -- to match the visibility of the formal type
3405 -- Start of processing for Analyze_Package_Instantiation
3408 Check_SPARK_Restriction
("generic is not allowed", N
);
3410 -- Very first thing: apply the special kludge for Text_IO processing
3411 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3413 Text_IO_Kludge
(Name
(N
));
3415 -- Make node global for error reporting
3417 Instantiation_Node
:= N
;
3419 -- Turn off style checking in instances. If the check is enabled on the
3420 -- generic unit, a warning in an instance would just be noise. If not
3421 -- enabled on the generic, then a warning in an instance is just wrong.
3423 Style_Check
:= False;
3425 -- Case of instantiation of a generic package
3427 if Nkind
(N
) = N_Package_Instantiation
then
3428 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3429 Set_Comes_From_Source
(Act_Decl_Id
, True);
3431 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
3433 Make_Defining_Program_Unit_Name
(Loc
,
3434 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
3435 Defining_Identifier
=> Act_Decl_Id
);
3437 Act_Decl_Name
:= Act_Decl_Id
;
3440 -- Case of instantiation of a formal package
3443 Act_Decl_Id
:= Defining_Identifier
(N
);
3444 Act_Decl_Name
:= Act_Decl_Id
;
3447 Generate_Definition
(Act_Decl_Id
);
3448 Preanalyze_Actuals
(N
);
3451 Env_Installed
:= True;
3453 -- Reset renaming map for formal types. The mapping is established
3454 -- when analyzing the generic associations, but some mappings are
3455 -- inherited from formal packages of parent units, and these are
3456 -- constructed when the parents are installed.
3458 Generic_Renamings
.Set_Last
(0);
3459 Generic_Renamings_HTable
.Reset
;
3461 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3462 Gen_Unit
:= Entity
(Gen_Id
);
3464 -- Verify that it is the name of a generic package
3466 -- A visibility glitch: if the instance is a child unit and the generic
3467 -- is the generic unit of a parent instance (i.e. both the parent and
3468 -- the child units are instances of the same package) the name now
3469 -- denotes the renaming within the parent, not the intended generic
3470 -- unit. See if there is a homonym that is the desired generic. The
3471 -- renaming declaration must be visible inside the instance of the
3472 -- child, but not when analyzing the name in the instantiation itself.
3474 if Ekind
(Gen_Unit
) = E_Package
3475 and then Present
(Renamed_Entity
(Gen_Unit
))
3476 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
3477 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
3478 and then Present
(Homonym
(Gen_Unit
))
3480 Gen_Unit
:= Homonym
(Gen_Unit
);
3483 if Etype
(Gen_Unit
) = Any_Type
then
3487 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
3489 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3491 if From_Limited_With
(Gen_Unit
) then
3493 ("cannot instantiate a limited withed package", Gen_Id
);
3496 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
3503 if In_Extended_Main_Source_Unit
(N
) then
3504 Set_Is_Instantiated
(Gen_Unit
);
3505 Generate_Reference
(Gen_Unit
, N
);
3507 if Present
(Renamed_Object
(Gen_Unit
)) then
3508 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
3509 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
3513 if Nkind
(Gen_Id
) = N_Identifier
3514 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3517 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3519 elsif Nkind
(Gen_Id
) = N_Expanded_Name
3520 and then Is_Child_Unit
(Gen_Unit
)
3521 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
3522 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
3525 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
3528 Set_Entity
(Gen_Id
, Gen_Unit
);
3530 -- If generic is a renaming, get original generic unit
3532 if Present
(Renamed_Object
(Gen_Unit
))
3533 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
3535 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3538 -- Verify that there are no circular instantiations
3540 if In_Open_Scopes
(Gen_Unit
) then
3541 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3545 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3546 Error_Msg_Node_2
:= Current_Scope
;
3548 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3549 Circularity_Detected
:= True;
3554 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3556 -- Initialize renamings map, for error checking, and the list that
3557 -- holds private entities whose views have changed between generic
3558 -- definition and instantiation. If this is the instance created to
3559 -- validate an actual package, the instantiation environment is that
3560 -- of the enclosing instance.
3562 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3564 -- Copy original generic tree, to produce text for instantiation
3568 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3570 Act_Spec
:= Specification
(Act_Tree
);
3572 -- If this is the instance created to validate an actual package,
3573 -- only the formals matter, do not examine the package spec itself.
3575 if Is_Actual_Pack
then
3576 Set_Visible_Declarations
(Act_Spec
, New_List
);
3577 Set_Private_Declarations
(Act_Spec
, New_List
);
3581 Analyze_Associations
3583 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
3584 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
3586 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
3588 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3589 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3590 Set_Is_Generic_Instance
(Act_Decl_Id
);
3592 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3594 -- References to the generic in its own declaration or its body are
3595 -- references to the instance. Add a renaming declaration for the
3596 -- generic unit itself. This declaration, as well as the renaming
3597 -- declarations for the generic formals, must remain private to the
3598 -- unit: the formals, because this is the language semantics, and
3599 -- the unit because its use is an artifact of the implementation.
3602 Make_Package_Renaming_Declaration
(Loc
,
3603 Defining_Unit_Name
=>
3604 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3605 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
3607 Append
(Unit_Renaming
, Renaming_List
);
3609 -- The renaming declarations are the first local declarations of the
3612 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3614 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3616 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3620 Make_Package_Declaration
(Loc
,
3621 Specification
=> Act_Spec
);
3623 -- Propagate the aspect specifications from the package declaration
3624 -- template to the instantiated version of the package declaration.
3626 if Has_Aspects
(Act_Tree
) then
3627 Set_Aspect_Specifications
(Act_Decl
,
3628 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
3631 -- Save the instantiation node, for subsequent instantiation of the
3632 -- body, if there is one and we are generating code for the current
3633 -- unit. Mark unit as having a body (avoids premature error message).
3635 -- We instantiate the body if we are generating code, if we are
3636 -- generating cross-reference information, or if we are building
3637 -- trees for ASIS use or GNATprove use.
3640 Enclosing_Body_Present
: Boolean := False;
3641 -- If the generic unit is not a compilation unit, then a body may
3642 -- be present in its parent even if none is required. We create a
3643 -- tentative pending instantiation for the body, which will be
3644 -- discarded if none is actually present.
3649 if Scope
(Gen_Unit
) /= Standard_Standard
3650 and then not Is_Child_Unit
(Gen_Unit
)
3652 Scop
:= Scope
(Gen_Unit
);
3654 while Present
(Scop
)
3655 and then Scop
/= Standard_Standard
3657 if Unit_Requires_Body
(Scop
) then
3658 Enclosing_Body_Present
:= True;
3661 elsif In_Open_Scopes
(Scop
)
3662 and then In_Package_Body
(Scop
)
3664 Enclosing_Body_Present
:= True;
3668 exit when Is_Compilation_Unit
(Scop
);
3669 Scop
:= Scope
(Scop
);
3673 -- If front-end inlining is enabled, and this is a unit for which
3674 -- code will be generated, we instantiate the body at once.
3676 -- This is done if the instance is not the main unit, and if the
3677 -- generic is not a child unit of another generic, to avoid scope
3678 -- problems and the reinstallation of parent instances.
3681 and then (not Is_Child_Unit
(Gen_Unit
)
3682 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
3683 and then Might_Inline_Subp
3684 and then not Is_Actual_Pack
3686 if not Debug_Flag_Dot_K
3687 and then Front_End_Inlining
3688 and then (Is_In_Main_Unit
(N
)
3689 or else In_Main_Context
(Current_Scope
))
3690 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3694 elsif Debug_Flag_Dot_K
3695 and then Must_Inline_Subp
3696 and then (Is_In_Main_Unit
(N
)
3697 or else In_Main_Context
(Current_Scope
))
3698 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3702 -- In configurable_run_time mode we force the inlining of
3703 -- predefined subprograms marked Inline_Always, to minimize
3704 -- the use of the run-time library.
3706 elsif Is_Predefined_File_Name
3707 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
3708 and then Configurable_Run_Time_Mode
3709 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3714 -- If the current scope is itself an instance within a child
3715 -- unit, there will be duplications in the scope stack, and the
3716 -- unstacking mechanism in Inline_Instance_Body will fail.
3717 -- This loses some rare cases of optimization, and might be
3718 -- improved some day, if we can find a proper abstraction for
3719 -- "the complete compilation context" that can be saved and
3722 if Is_Generic_Instance
(Current_Scope
) then
3724 Curr_Unit
: constant Entity_Id
:=
3725 Cunit_Entity
(Current_Sem_Unit
);
3727 if Curr_Unit
/= Current_Scope
3728 and then Is_Child_Unit
(Curr_Unit
)
3730 Inline_Now
:= False;
3737 (Unit_Requires_Body
(Gen_Unit
)
3738 or else Enclosing_Body_Present
3739 or else Present
(Corresponding_Body
(Gen_Decl
)))
3740 and then (Is_In_Main_Unit
(N
) or else Might_Inline_Subp
)
3741 and then not Is_Actual_Pack
3742 and then not Inline_Now
3743 and then (Operating_Mode
= Generate_Code
3745 -- Need comment for this check ???
3747 or else (Operating_Mode
= Check_Semantics
3748 and then (ASIS_Mode
or GNATprove_Mode
)));
3750 -- If front_end_inlining is enabled, do not instantiate body if
3751 -- within a generic context.
3753 if (Front_End_Inlining
and then not Expander_Active
)
3754 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
3756 Needs_Body
:= False;
3759 -- If the current context is generic, and the package being
3760 -- instantiated is declared within a formal package, there is no
3761 -- body to instantiate until the enclosing generic is instantiated
3762 -- and there is an actual for the formal package. If the formal
3763 -- package has parameters, we build a regular package instance for
3764 -- it, that precedes the original formal package declaration.
3766 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
3768 Decl
: constant Node_Id
:=
3770 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
3772 if Nkind
(Decl
) = N_Formal_Package_Declaration
3773 or else (Nkind
(Decl
) = N_Package_Declaration
3774 and then Is_List_Member
(Decl
)
3775 and then Present
(Next
(Decl
))
3777 Nkind
(Next
(Decl
)) =
3778 N_Formal_Package_Declaration
)
3780 Needs_Body
:= False;
3786 -- For RCI unit calling stubs, we omit the instance body if the
3787 -- instance is the RCI library unit itself.
3789 -- However there is a special case for nested instances: in this case
3790 -- we do generate the instance body, as it might be required, e.g.
3791 -- because it provides stream attributes for some type used in the
3792 -- profile of a remote subprogram. This is consistent with 12.3(12),
3793 -- which indicates that the instance body occurs at the place of the
3794 -- instantiation, and thus is part of the RCI declaration, which is
3795 -- present on all client partitions (this is E.2.3(18)).
3797 -- Note that AI12-0002 may make it illegal at some point to have
3798 -- stream attributes defined in an RCI unit, in which case this
3799 -- special case will become unnecessary. In the meantime, there
3800 -- is known application code in production that depends on this
3801 -- being possible, so we definitely cannot eliminate the body in
3802 -- the case of nested instances for the time being.
3804 -- When we generate a nested instance body, calling stubs for any
3805 -- relevant subprogram will be be inserted immediately after the
3806 -- subprogram declarations, and will take precedence over the
3807 -- subsequent (original) body. (The stub and original body will be
3808 -- complete homographs, but this is permitted in an instance).
3809 -- (Could we do better and remove the original body???)
3811 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
3812 and then Comes_From_Source
(N
)
3813 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
3815 Needs_Body
:= False;
3820 -- Here is a defence against a ludicrous number of instantiations
3821 -- caused by a circular set of instantiation attempts.
3823 if Pending_Instantiations
.Last
> Maximum_Instantiations
then
3824 Error_Msg_Uint_1
:= UI_From_Int
(Maximum_Instantiations
);
3825 Error_Msg_N
("too many instantiations, exceeds max of^", N
);
3826 Error_Msg_N
("\limit can be changed using -gnateinn switch", N
);
3827 raise Unrecoverable_Error
;
3830 -- Indicate that the enclosing scopes contain an instantiation,
3831 -- and that cleanup actions should be delayed until after the
3832 -- instance body is expanded.
3834 Check_Forward_Instantiation
(Gen_Decl
);
3835 if Nkind
(N
) = N_Package_Instantiation
then
3837 Enclosing_Master
: Entity_Id
;
3840 -- Loop to search enclosing masters
3842 Enclosing_Master
:= Current_Scope
;
3843 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
3844 if Ekind
(Enclosing_Master
) = E_Package
then
3845 if Is_Compilation_Unit
(Enclosing_Master
) then
3846 if In_Package_Body
(Enclosing_Master
) then
3848 (Body_Entity
(Enclosing_Master
));
3857 Enclosing_Master
:= Scope
(Enclosing_Master
);
3860 elsif Is_Generic_Unit
(Enclosing_Master
)
3861 or else Ekind
(Enclosing_Master
) = E_Void
3863 -- Cleanup actions will eventually be performed on the
3864 -- enclosing subprogram or package instance, if any.
3865 -- Enclosing scope is void in the formal part of a
3866 -- generic subprogram.
3871 if Ekind
(Enclosing_Master
) = E_Entry
3873 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
3875 if not Expander_Active
then
3879 Protected_Body_Subprogram
(Enclosing_Master
);
3883 Set_Delay_Cleanups
(Enclosing_Master
);
3885 while Ekind
(Enclosing_Master
) = E_Block
loop
3886 Enclosing_Master
:= Scope
(Enclosing_Master
);
3889 if Is_Subprogram
(Enclosing_Master
) then
3890 Delay_Descriptors
(Enclosing_Master
);
3892 elsif Is_Task_Type
(Enclosing_Master
) then
3894 TBP
: constant Node_Id
:=
3895 Get_Task_Body_Procedure
3898 if Present
(TBP
) then
3899 Delay_Descriptors
(TBP
);
3900 Set_Delay_Cleanups
(TBP
);
3907 end loop Scope_Loop
;
3910 -- Make entry in table
3912 Pending_Instantiations
.Append
3914 Act_Decl
=> Act_Decl
,
3915 Expander_Status
=> Expander_Active
,
3916 Current_Sem_Unit
=> Current_Sem_Unit
,
3917 Scope_Suppress
=> Scope_Suppress
,
3918 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
3919 Version
=> Ada_Version
,
3920 Version_Pragma
=> Ada_Version_Pragma
,
3921 Warnings
=> Save_Warnings
,
3922 SPARK_Mode
=> SPARK_Mode
,
3923 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
3927 Set_Categorization_From_Pragmas
(Act_Decl
);
3929 if Parent_Installed
then
3933 Set_Instance_Spec
(N
, Act_Decl
);
3935 -- If not a compilation unit, insert the package declaration before
3936 -- the original instantiation node.
3938 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3939 Mark_Rewrite_Insertion
(Act_Decl
);
3940 Insert_Before
(N
, Act_Decl
);
3943 -- For an instantiation that is a compilation unit, place
3944 -- declaration on current node so context is complete for analysis
3945 -- (including nested instantiations). If this is the main unit,
3946 -- the declaration eventually replaces the instantiation node.
3947 -- If the instance body is created later, it replaces the
3948 -- instance node, and the declaration is attached to it
3949 -- (see Build_Instance_Compilation_Unit_Nodes).
3952 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
3954 -- The entity for the current unit is the newly created one,
3955 -- and all semantic information is attached to it.
3957 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
3959 -- If this is the main unit, replace the main entity as well
3961 if Current_Sem_Unit
= Main_Unit
then
3962 Main_Unit_Entity
:= Act_Decl_Id
;
3966 Set_Unit
(Parent
(N
), Act_Decl
);
3967 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3968 Set_Package_Instantiation
(Act_Decl_Id
, N
);
3970 -- Process aspect specifications of the instance node, if any, to
3971 -- take into account categorization pragmas before analyzing the
3974 if Has_Aspects
(N
) then
3975 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
3979 Set_Unit
(Parent
(N
), N
);
3980 Set_Body_Required
(Parent
(N
), False);
3982 -- We never need elaboration checks on instantiations, since by
3983 -- definition, the body instantiation is elaborated at the same
3984 -- time as the spec instantiation.
3986 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3987 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3990 Check_Elab_Instantiation
(N
);
3992 if ABE_Is_Certain
(N
) and then Needs_Body
then
3993 Pending_Instantiations
.Decrement_Last
;
3996 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3998 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
3999 First_Private_Entity
(Act_Decl_Id
));
4001 -- If the instantiation will receive a body, the unit will be
4002 -- transformed into a package body, and receive its own elaboration
4003 -- entity. Otherwise, the nature of the unit is now a package
4006 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4007 and then not Needs_Body
4009 Rewrite
(N
, Act_Decl
);
4012 if Present
(Corresponding_Body
(Gen_Decl
))
4013 or else Unit_Requires_Body
(Gen_Unit
)
4015 Set_Has_Completion
(Act_Decl_Id
);
4018 Check_Formal_Packages
(Act_Decl_Id
);
4020 Restore_Hidden_Primitives
(Vis_Prims_List
);
4021 Restore_Private_Views
(Act_Decl_Id
);
4023 Inherit_Context
(Gen_Decl
, N
);
4025 if Parent_Installed
then
4030 Env_Installed
:= False;
4033 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4035 -- There used to be a check here to prevent instantiations in local
4036 -- contexts if the No_Local_Allocators restriction was active. This
4037 -- check was removed by a binding interpretation in AI-95-00130/07,
4038 -- but we retain the code for documentation purposes.
4040 -- if Ekind (Act_Decl_Id) /= E_Void
4041 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4043 -- Check_Restriction (No_Local_Allocators, N);
4047 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4050 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4051 -- be used as defining identifiers for a formal package and for the
4052 -- corresponding expanded package.
4054 if Nkind
(N
) = N_Formal_Package_Declaration
then
4055 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4056 Set_Comes_From_Source
(Act_Decl_Id
, True);
4057 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
4058 Set_Defining_Identifier
(N
, Act_Decl_Id
);
4061 Style_Check
:= Save_Style_Check
;
4063 -- Check that if N is an instantiation of System.Dim_Float_IO or
4064 -- System.Dim_Integer_IO, the formal type has a dimension system.
4066 if Nkind
(N
) = N_Package_Instantiation
4067 and then Is_Dim_IO_Package_Instantiation
(N
)
4070 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4072 if not Has_Dimension_System
4073 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4075 Error_Msg_N
("type with a dimension system expected", Assoc
);
4081 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4082 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4086 when Instantiation_Error
=>
4087 if Parent_Installed
then
4091 if Env_Installed
then
4095 Style_Check
:= Save_Style_Check
;
4096 end Analyze_Package_Instantiation
;
4098 --------------------------
4099 -- Inline_Instance_Body --
4100 --------------------------
4102 procedure Inline_Instance_Body
4104 Gen_Unit
: Entity_Id
;
4108 Gen_Comp
: constant Entity_Id
:=
4109 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
4110 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
4111 Curr_Scope
: Entity_Id
:= Empty
;
4112 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
4113 Removed
: Boolean := False;
4114 Num_Scopes
: Int
:= 0;
4116 Scope_Stack_Depth
: constant Int
:=
4117 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
4119 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
4120 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4121 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4123 Num_Inner
: Int
:= 0;
4124 N_Instances
: Int
:= 0;
4128 -- Case of generic unit defined in another unit. We must remove the
4129 -- complete context of the current unit to install that of the generic.
4131 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
4133 -- Add some comments for the following two loops ???
4136 while Present
(S
) and then S
/= Standard_Standard
loop
4138 Num_Scopes
:= Num_Scopes
+ 1;
4140 Use_Clauses
(Num_Scopes
) :=
4142 (Scope_Stack
.Last
- Num_Scopes
+ 1).
4144 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
4146 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
4147 or else Scope_Stack
.Table
4148 (Scope_Stack
.Last
- Num_Scopes
).Entity
4152 exit when Is_Generic_Instance
(S
)
4153 and then (In_Package_Body
(S
)
4154 or else Ekind
(S
) = E_Procedure
4155 or else Ekind
(S
) = E_Function
);
4159 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
4161 -- Find and save all enclosing instances
4166 and then S
/= Standard_Standard
4168 if Is_Generic_Instance
(S
) then
4169 N_Instances
:= N_Instances
+ 1;
4170 Instances
(N_Instances
) := S
;
4172 exit when In_Package_Body
(S
);
4178 -- Remove context of current compilation unit, unless we are within a
4179 -- nested package instantiation, in which case the context has been
4180 -- removed previously.
4182 -- If current scope is the body of a child unit, remove context of
4183 -- spec as well. If an enclosing scope is an instance body, the
4184 -- context has already been removed, but the entities in the body
4185 -- must be made invisible as well.
4190 and then S
/= Standard_Standard
4192 if Is_Generic_Instance
(S
)
4193 and then (In_Package_Body
(S
)
4194 or else Ekind
(S
) = E_Procedure
4195 or else Ekind
(S
) = E_Function
)
4197 -- We still have to remove the entities of the enclosing
4198 -- instance from direct visibility.
4203 E
:= First_Entity
(S
);
4204 while Present
(E
) loop
4205 Set_Is_Immediately_Visible
(E
, False);
4214 or else (Ekind
(Curr_Unit
) = E_Package_Body
4215 and then S
= Spec_Entity
(Curr_Unit
))
4216 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
4219 (Unit_Declaration_Node
(Curr_Unit
)))
4223 -- Remove entities in current scopes from visibility, so that
4224 -- instance body is compiled in a clean environment.
4226 List
:= Save_Scope_Stack
(Handle_Use
=> False);
4228 if Is_Child_Unit
(S
) then
4230 -- Remove child unit from stack, as well as inner scopes.
4231 -- Removing the context of a child unit removes parent units
4234 while Current_Scope
/= S
loop
4235 Num_Inner
:= Num_Inner
+ 1;
4236 Inner_Scopes
(Num_Inner
) := Current_Scope
;
4241 Remove_Context
(Curr_Comp
);
4245 Remove_Context
(Curr_Comp
);
4248 if Ekind
(Curr_Unit
) = E_Package_Body
then
4249 Remove_Context
(Library_Unit
(Curr_Comp
));
4255 pragma Assert
(Num_Inner
< Num_Scopes
);
4257 Push_Scope
(Standard_Standard
);
4258 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
4259 Instantiate_Package_Body
4262 Act_Decl
=> Act_Decl
,
4263 Expander_Status
=> Expander_Active
,
4264 Current_Sem_Unit
=> Current_Sem_Unit
,
4265 Scope_Suppress
=> Scope_Suppress
,
4266 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4267 Version
=> Ada_Version
,
4268 Version_Pragma
=> Ada_Version_Pragma
,
4269 Warnings
=> Save_Warnings
,
4270 SPARK_Mode
=> SPARK_Mode
,
4271 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
4272 Inlined_Body
=> True);
4278 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
4280 -- Reset Generic_Instance flag so that use clauses can be installed
4281 -- in the proper order. (See Use_One_Package for effect of enclosing
4282 -- instances on processing of use clauses).
4284 for J
in 1 .. N_Instances
loop
4285 Set_Is_Generic_Instance
(Instances
(J
), False);
4289 Install_Context
(Curr_Comp
);
4291 if Present
(Curr_Scope
)
4292 and then Is_Child_Unit
(Curr_Scope
)
4294 Push_Scope
(Curr_Scope
);
4295 Set_Is_Immediately_Visible
(Curr_Scope
);
4297 -- Finally, restore inner scopes as well
4299 for J
in reverse 1 .. Num_Inner
loop
4300 Push_Scope
(Inner_Scopes
(J
));
4304 Restore_Scope_Stack
(List
, Handle_Use
=> False);
4306 if Present
(Curr_Scope
)
4308 (In_Private_Part
(Curr_Scope
)
4309 or else In_Package_Body
(Curr_Scope
))
4311 -- Install private declaration of ancestor units, which are
4312 -- currently available. Restore_Scope_Stack and Install_Context
4313 -- only install the visible part of parents.
4318 Par
:= Scope
(Curr_Scope
);
4319 while (Present
(Par
))
4320 and then Par
/= Standard_Standard
4322 Install_Private_Declarations
(Par
);
4329 -- Restore use clauses. For a child unit, use clauses in the parents
4330 -- are restored when installing the context, so only those in inner
4331 -- scopes (and those local to the child unit itself) need to be
4332 -- installed explicitly.
4334 if Is_Child_Unit
(Curr_Unit
)
4337 for J
in reverse 1 .. Num_Inner
+ 1 loop
4338 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4340 Install_Use_Clauses
(Use_Clauses
(J
));
4344 for J
in reverse 1 .. Num_Scopes
loop
4345 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4347 Install_Use_Clauses
(Use_Clauses
(J
));
4351 -- Restore status of instances. If one of them is a body, make its
4352 -- local entities visible again.
4359 for J
in 1 .. N_Instances
loop
4360 Inst
:= Instances
(J
);
4361 Set_Is_Generic_Instance
(Inst
, True);
4363 if In_Package_Body
(Inst
)
4364 or else Ekind
(S
) = E_Procedure
4365 or else Ekind
(S
) = E_Function
4367 E
:= First_Entity
(Instances
(J
));
4368 while Present
(E
) loop
4369 Set_Is_Immediately_Visible
(E
);
4376 -- If generic unit is in current unit, current context is correct
4379 Instantiate_Package_Body
4382 Act_Decl
=> Act_Decl
,
4383 Expander_Status
=> Expander_Active
,
4384 Current_Sem_Unit
=> Current_Sem_Unit
,
4385 Scope_Suppress
=> Scope_Suppress
,
4386 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4387 Version
=> Ada_Version
,
4388 Version_Pragma
=> Ada_Version_Pragma
,
4389 Warnings
=> Save_Warnings
,
4390 SPARK_Mode
=> SPARK_Mode
,
4391 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
4392 Inlined_Body
=> True);
4394 end Inline_Instance_Body
;
4396 -------------------------------------
4397 -- Analyze_Procedure_Instantiation --
4398 -------------------------------------
4400 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
4402 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
4403 end Analyze_Procedure_Instantiation
;
4405 -----------------------------------
4406 -- Need_Subprogram_Instance_Body --
4407 -----------------------------------
4409 function Need_Subprogram_Instance_Body
4411 Subp
: Entity_Id
) return Boolean
4414 -- Must be inlined (or inlined renaming)
4416 if (Is_In_Main_Unit
(N
)
4417 or else Is_Inlined
(Subp
)
4418 or else Is_Inlined
(Alias
(Subp
)))
4420 -- Must be generating code or analyzing code in ASIS/GNATprove mode
4422 and then (Operating_Mode
= Generate_Code
4423 or else (Operating_Mode
= Check_Semantics
4424 and then (ASIS_Mode
or GNATprove_Mode
)))
4426 -- The body is needed when generating code (full expansion), in ASIS
4427 -- mode for other tools, and in GNATprove mode (special expansion) for
4428 -- formal verification of the body itself.
4430 and then (Expander_Active
or ASIS_Mode
or GNATprove_Mode
)
4432 -- No point in inlining if ABE is inevitable
4434 and then not ABE_Is_Certain
(N
)
4436 -- Or if subprogram is eliminated
4438 and then not Is_Eliminated
(Subp
)
4440 Pending_Instantiations
.Append
4442 Act_Decl
=> Unit_Declaration_Node
(Subp
),
4443 Expander_Status
=> Expander_Active
,
4444 Current_Sem_Unit
=> Current_Sem_Unit
,
4445 Scope_Suppress
=> Scope_Suppress
,
4446 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4447 Version
=> Ada_Version
,
4448 Version_Pragma
=> Ada_Version_Pragma
,
4449 Warnings
=> Save_Warnings
,
4450 SPARK_Mode
=> SPARK_Mode
,
4451 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
4454 -- Here if not inlined, or we ignore the inlining
4459 end Need_Subprogram_Instance_Body
;
4461 --------------------------------------
4462 -- Analyze_Subprogram_Instantiation --
4463 --------------------------------------
4465 procedure Analyze_Subprogram_Instantiation
4469 Loc
: constant Source_Ptr
:= Sloc
(N
);
4470 Gen_Id
: constant Node_Id
:= Name
(N
);
4472 Anon_Id
: constant Entity_Id
:=
4473 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
4474 Chars
=> New_External_Name
4475 (Chars
(Defining_Entity
(N
)), 'R'));
4477 Act_Decl_Id
: Entity_Id
;
4482 Env_Installed
: Boolean := False;
4483 Gen_Unit
: Entity_Id
;
4485 Pack_Id
: Entity_Id
;
4486 Parent_Installed
: Boolean := False;
4487 Renaming_List
: List_Id
;
4489 procedure Analyze_Instance_And_Renamings
;
4490 -- The instance must be analyzed in a context that includes the mappings
4491 -- of generic parameters into actuals. We create a package declaration
4492 -- for this purpose, and a subprogram with an internal name within the
4493 -- package. The subprogram instance is simply an alias for the internal
4494 -- subprogram, declared in the current scope.
4496 ------------------------------------
4497 -- Analyze_Instance_And_Renamings --
4498 ------------------------------------
4500 procedure Analyze_Instance_And_Renamings
is
4501 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
4502 Pack_Decl
: Node_Id
;
4505 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4507 -- For the case of a compilation unit, the container package has
4508 -- the same name as the instantiation, to insure that the binder
4509 -- calls the elaboration procedure with the right name. Copy the
4510 -- entity of the instance, which may have compilation level flags
4511 -- (e.g. Is_Child_Unit) set.
4513 Pack_Id
:= New_Copy
(Def_Ent
);
4516 -- Otherwise we use the name of the instantiation concatenated
4517 -- with its source position to ensure uniqueness if there are
4518 -- several instantiations with the same name.
4521 Make_Defining_Identifier
(Loc
,
4522 Chars
=> New_External_Name
4523 (Related_Id
=> Chars
(Def_Ent
),
4525 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
4528 Pack_Decl
:= Make_Package_Declaration
(Loc
,
4529 Specification
=> Make_Package_Specification
(Loc
,
4530 Defining_Unit_Name
=> Pack_Id
,
4531 Visible_Declarations
=> Renaming_List
,
4532 End_Label
=> Empty
));
4534 Set_Instance_Spec
(N
, Pack_Decl
);
4535 Set_Is_Generic_Instance
(Pack_Id
);
4536 Set_Debug_Info_Needed
(Pack_Id
);
4538 -- Case of not a compilation unit
4540 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4541 Mark_Rewrite_Insertion
(Pack_Decl
);
4542 Insert_Before
(N
, Pack_Decl
);
4543 Set_Has_Completion
(Pack_Id
);
4545 -- Case of an instantiation that is a compilation unit
4547 -- Place declaration on current node so context is complete for
4548 -- analysis (including nested instantiations), and for use in a
4549 -- context_clause (see Analyze_With_Clause).
4552 Set_Unit
(Parent
(N
), Pack_Decl
);
4553 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
4556 Analyze
(Pack_Decl
);
4557 Check_Formal_Packages
(Pack_Id
);
4558 Set_Is_Generic_Instance
(Pack_Id
, False);
4560 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4563 -- Body of the enclosing package is supplied when instantiating the
4564 -- subprogram body, after semantic analysis is completed.
4566 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4568 -- Remove package itself from visibility, so it does not
4569 -- conflict with subprogram.
4571 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
4573 -- Set name and scope of internal subprogram so that the proper
4574 -- external name will be generated. The proper scope is the scope
4575 -- of the wrapper package. We need to generate debugging info for
4576 -- the internal subprogram, so set flag accordingly.
4578 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
4579 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
4581 -- Mark wrapper package as referenced, to avoid spurious warnings
4582 -- if the instantiation appears in various with_ clauses of
4583 -- subunits of the main unit.
4585 Set_Referenced
(Pack_Id
);
4588 Set_Is_Generic_Instance
(Anon_Id
);
4589 Set_Debug_Info_Needed
(Anon_Id
);
4590 Act_Decl_Id
:= New_Copy
(Anon_Id
);
4592 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
4593 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
4594 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
4595 Set_Comes_From_Source
(Act_Decl_Id
, True);
4597 -- The signature may involve types that are not frozen yet, but the
4598 -- subprogram will be frozen at the point the wrapper package is
4599 -- frozen, so it does not need its own freeze node. In fact, if one
4600 -- is created, it might conflict with the freezing actions from the
4603 Set_Has_Delayed_Freeze
(Anon_Id
, False);
4605 -- If the instance is a child unit, mark the Id accordingly. Mark
4606 -- the anonymous entity as well, which is the real subprogram and
4607 -- which is used when the instance appears in a context clause.
4608 -- Similarly, propagate the Is_Eliminated flag to handle properly
4609 -- nested eliminated subprograms.
4611 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
4612 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
4613 New_Overloaded_Entity
(Act_Decl_Id
);
4614 Check_Eliminated
(Act_Decl_Id
);
4615 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
4617 -- In compilation unit case, kill elaboration checks on the
4618 -- instantiation, since they are never needed -- the body is
4619 -- instantiated at the same point as the spec.
4621 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4622 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4623 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4624 Set_Is_Compilation_Unit
(Anon_Id
);
4626 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
4629 -- The instance is not a freezing point for the new subprogram
4631 Set_Is_Frozen
(Act_Decl_Id
, False);
4633 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
4634 Valid_Operator_Definition
(Act_Decl_Id
);
4637 Set_Alias
(Act_Decl_Id
, Anon_Id
);
4638 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
4639 Set_Has_Completion
(Act_Decl_Id
);
4640 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
4642 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4643 Set_Body_Required
(Parent
(N
), False);
4645 end Analyze_Instance_And_Renamings
;
4649 Vis_Prims_List
: Elist_Id
:= No_Elist
;
4650 -- List of primitives made temporarily visible in the instantiation
4651 -- to match the visibility of the formal type
4653 -- Start of processing for Analyze_Subprogram_Instantiation
4656 Check_SPARK_Restriction
("generic is not allowed", N
);
4658 -- Very first thing: apply the special kludge for Text_IO processing
4659 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4660 -- Of course such an instantiation is bogus (these are packages, not
4661 -- subprograms), but we get a better error message if we do this.
4663 Text_IO_Kludge
(Gen_Id
);
4665 -- Make node global for error reporting
4667 Instantiation_Node
:= N
;
4669 -- For package instantiations we turn off style checks, because they
4670 -- will have been emitted in the generic. For subprogram instantiations
4671 -- we want to apply at least the check on overriding indicators so we
4672 -- do not modify the style check status.
4674 -- The renaming declarations for the actuals do not come from source and
4675 -- will not generate spurious warnings.
4677 Preanalyze_Actuals
(N
);
4680 Env_Installed
:= True;
4681 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4682 Gen_Unit
:= Entity
(Gen_Id
);
4684 Generate_Reference
(Gen_Unit
, Gen_Id
);
4686 if Nkind
(Gen_Id
) = N_Identifier
4687 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4690 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4693 if Etype
(Gen_Unit
) = Any_Type
then
4698 -- Verify that it is a generic subprogram of the right kind, and that
4699 -- it does not lead to a circular instantiation.
4701 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
4703 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
4705 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
4707 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
4709 elsif In_Open_Scopes
(Gen_Unit
) then
4710 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4713 Set_Entity
(Gen_Id
, Gen_Unit
);
4714 Set_Is_Instantiated
(Gen_Unit
);
4716 if In_Extended_Main_Source_Unit
(N
) then
4717 Generate_Reference
(Gen_Unit
, N
);
4720 -- If renaming, get original unit
4722 if Present
(Renamed_Object
(Gen_Unit
))
4723 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
4725 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
4727 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4728 Set_Is_Instantiated
(Gen_Unit
);
4729 Generate_Reference
(Gen_Unit
, N
);
4732 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4733 Error_Msg_Node_2
:= Current_Scope
;
4735 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4736 Circularity_Detected
:= True;
4737 Restore_Hidden_Primitives
(Vis_Prims_List
);
4741 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4743 -- Initialize renamings map, for error checking
4745 Generic_Renamings
.Set_Last
(0);
4746 Generic_Renamings_HTable
.Reset
;
4748 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
4750 -- Copy original generic tree, to produce text for instantiation
4754 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4756 -- Inherit overriding indicator from instance node
4758 Act_Spec
:= Specification
(Act_Tree
);
4759 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
4760 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
4763 Analyze_Associations
4765 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4766 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4768 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4770 -- The subprogram itself cannot contain a nested instance, so the
4771 -- current parent is left empty.
4773 Set_Instance_Env
(Gen_Unit
, Empty
);
4775 -- Build the subprogram declaration, which does not appear in the
4776 -- generic template, and give it a sloc consistent with that of the
4779 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
4780 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4782 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
4783 Specification
=> Act_Spec
);
4785 -- The aspects have been copied previously, but they have to be
4786 -- linked explicitly to the new subprogram declaration. Explicit
4787 -- pre/postconditions on the instance are analyzed below, in a
4790 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
4791 Set_Categorization_From_Pragmas
(Act_Decl
);
4793 if Parent_Installed
then
4797 Append
(Act_Decl
, Renaming_List
);
4798 Analyze_Instance_And_Renamings
;
4800 -- If the generic is marked Import (Intrinsic), then so is the
4801 -- instance. This indicates that there is no body to instantiate. If
4802 -- generic is marked inline, so it the instance, and the anonymous
4803 -- subprogram it renames. If inlined, or else if inlining is enabled
4804 -- for the compilation, we generate the instance body even if it is
4805 -- not within the main unit.
4807 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
4808 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
4809 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
4811 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
4812 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
4816 -- Inherit convention from generic unit. Intrinsic convention, as for
4817 -- an instance of unchecked conversion, is not inherited because an
4818 -- explicit Ada instance has been created.
4820 if Has_Convention_Pragma
(Gen_Unit
)
4821 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
4823 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
4824 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
4827 Generate_Definition
(Act_Decl_Id
);
4828 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
4830 Set_Contract
(Act_Decl_Id
, Make_Contract
(Sloc
(Act_Decl_Id
)));
4832 -- Inherit all inlining-related flags which apply to the generic in
4833 -- the subprogram and its declaration.
4835 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
4836 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
4838 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
4839 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
4841 Set_Has_Pragma_Inline_Always
4842 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
4843 Set_Has_Pragma_Inline_Always
4844 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
4846 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
4847 Check_Elab_Instantiation
(N
);
4850 if Is_Dispatching_Operation
(Act_Decl_Id
)
4851 and then Ada_Version
>= Ada_2005
4857 Formal
:= First_Formal
(Act_Decl_Id
);
4858 while Present
(Formal
) loop
4859 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
4860 and then Is_Controlling_Formal
(Formal
)
4861 and then not Can_Never_Be_Null
(Formal
)
4863 Error_Msg_NE
("access parameter& is controlling,",
4866 ("\corresponding parameter of & must be"
4867 & " explicitly null-excluding", N
, Gen_Id
);
4870 Next_Formal
(Formal
);
4875 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4877 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4879 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
4880 Inherit_Context
(Gen_Decl
, N
);
4882 Restore_Private_Views
(Pack_Id
, False);
4884 -- If the context requires a full instantiation, mark node for
4885 -- subsequent construction of the body.
4887 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
4888 Check_Forward_Instantiation
(Gen_Decl
);
4890 -- The wrapper package is always delayed, because it does not
4891 -- constitute a freeze point, but to insure that the freeze
4892 -- node is placed properly, it is created directly when
4893 -- instantiating the body (otherwise the freeze node might
4894 -- appear to early for nested instantiations).
4896 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4898 -- For ASIS purposes, indicate that the wrapper package has
4899 -- replaced the instantiation node.
4901 Rewrite
(N
, Unit
(Parent
(N
)));
4902 Set_Unit
(Parent
(N
), N
);
4905 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4907 -- Replace instance node for library-level instantiations of
4908 -- intrinsic subprograms, for ASIS use.
4910 Rewrite
(N
, Unit
(Parent
(N
)));
4911 Set_Unit
(Parent
(N
), N
);
4914 if Parent_Installed
then
4918 Restore_Hidden_Primitives
(Vis_Prims_List
);
4920 Env_Installed
:= False;
4921 Generic_Renamings
.Set_Last
(0);
4922 Generic_Renamings_HTable
.Reset
;
4926 if Has_Aspects
(N
) then
4927 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4931 when Instantiation_Error
=>
4932 if Parent_Installed
then
4936 if Env_Installed
then
4939 end Analyze_Subprogram_Instantiation
;
4941 -------------------------
4942 -- Get_Associated_Node --
4943 -------------------------
4945 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
4949 Assoc
:= Associated_Node
(N
);
4951 if Nkind
(Assoc
) /= Nkind
(N
) then
4954 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
4958 -- If the node is part of an inner generic, it may itself have been
4959 -- remapped into a further generic copy. Associated_Node is otherwise
4960 -- used for the entity of the node, and will be of a different node
4961 -- kind, or else N has been rewritten as a literal or function call.
4963 while Present
(Associated_Node
(Assoc
))
4964 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
4966 Assoc
:= Associated_Node
(Assoc
);
4969 -- Follow and additional link in case the final node was rewritten.
4970 -- This can only happen with nested generic units.
4972 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
4973 and then Present
(Associated_Node
(Assoc
))
4974 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
4975 N_Explicit_Dereference
,
4980 Assoc
:= Associated_Node
(Assoc
);
4983 -- An additional special case: an unconstrained type in an object
4984 -- declaration may have been rewritten as a local subtype constrained
4985 -- by the expression in the declaration. We need to recover the
4986 -- original entity which may be global.
4988 if Present
(Original_Node
(Assoc
))
4989 and then Nkind
(Parent
(N
)) = N_Object_Declaration
4991 Assoc
:= Original_Node
(Assoc
);
4996 end Get_Associated_Node
;
4998 -------------------------------------------
4999 -- Build_Instance_Compilation_Unit_Nodes --
5000 -------------------------------------------
5002 procedure Build_Instance_Compilation_Unit_Nodes
5007 Decl_Cunit
: Node_Id
;
5008 Body_Cunit
: Node_Id
;
5010 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
5011 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
5014 -- A new compilation unit node is built for the instance declaration
5017 Make_Compilation_Unit
(Sloc
(N
),
5018 Context_Items
=> Empty_List
,
5020 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
5022 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
5024 -- The new compilation unit is linked to its body, but both share the
5025 -- same file, so we do not set Body_Required on the new unit so as not
5026 -- to create a spurious dependency on a non-existent body in the ali.
5027 -- This simplifies CodePeer unit traversal.
5029 -- We use the original instantiation compilation unit as the resulting
5030 -- compilation unit of the instance, since this is the main unit.
5032 Rewrite
(N
, Act_Body
);
5034 -- Propagate the aspect specifications from the package body template to
5035 -- the instantiated version of the package body.
5037 if Has_Aspects
(Act_Body
) then
5038 Set_Aspect_Specifications
5039 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
5042 Body_Cunit
:= Parent
(N
);
5044 -- The two compilation unit nodes are linked by the Library_Unit field
5046 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
5047 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
5049 -- Preserve the private nature of the package if needed
5051 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
5053 -- If the instance is not the main unit, its context, categorization
5054 -- and elaboration entity are not relevant to the compilation.
5056 if Body_Cunit
/= Cunit
(Main_Unit
) then
5057 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
5061 -- The context clause items on the instantiation, which are now attached
5062 -- to the body compilation unit (since the body overwrote the original
5063 -- instantiation node), semantically belong on the spec, so copy them
5064 -- there. It's harmless to leave them on the body as well. In fact one
5065 -- could argue that they belong in both places.
5067 Citem
:= First
(Context_Items
(Body_Cunit
));
5068 while Present
(Citem
) loop
5069 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
5073 -- Propagate categorization flags on packages, so that they appear in
5074 -- the ali file for the spec of the unit.
5076 if Ekind
(New_Main
) = E_Package
then
5077 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
5078 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
5079 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
5080 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
5081 Set_Is_Remote_Call_Interface
5082 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
5085 -- Make entry in Units table, so that binder can generate call to
5086 -- elaboration procedure for body, if any.
5088 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
5089 Main_Unit_Entity
:= New_Main
;
5090 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
5092 -- Build elaboration entity, since the instance may certainly generate
5093 -- elaboration code requiring a flag for protection.
5095 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
5096 end Build_Instance_Compilation_Unit_Nodes
;
5098 -----------------------------
5099 -- Check_Access_Definition --
5100 -----------------------------
5102 procedure Check_Access_Definition
(N
: Node_Id
) is
5105 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
5107 end Check_Access_Definition
;
5109 -----------------------------------
5110 -- Check_Formal_Package_Instance --
5111 -----------------------------------
5113 -- If the formal has specific parameters, they must match those of the
5114 -- actual. Both of them are instances, and the renaming declarations for
5115 -- their formal parameters appear in the same order in both. The analyzed
5116 -- formal has been analyzed in the context of the current instance.
5118 procedure Check_Formal_Package_Instance
5119 (Formal_Pack
: Entity_Id
;
5120 Actual_Pack
: Entity_Id
)
5122 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
5123 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
5128 procedure Check_Mismatch
(B
: Boolean);
5129 -- Common error routine for mismatch between the parameters of the
5130 -- actual instance and those of the formal package.
5132 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
5133 -- The formal may come from a nested formal package, and the actual may
5134 -- have been constant-folded. To determine whether the two denote the
5135 -- same entity we may have to traverse several definitions to recover
5136 -- the ultimate entity that they refer to.
5138 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
5139 -- Similarly, if the formal comes from a nested formal package, the
5140 -- actual may designate the formal through multiple renamings, which
5141 -- have to be followed to determine the original variable in question.
5143 --------------------
5144 -- Check_Mismatch --
5145 --------------------
5147 procedure Check_Mismatch
(B
: Boolean) is
5148 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
5151 if Kind
= N_Formal_Type_Declaration
then
5154 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
5155 N_Formal_Package_Declaration
)
5156 or else Kind
in N_Formal_Subprogram_Declaration
5162 ("actual for & in actual instance does not match formal",
5163 Parent
(Actual_Pack
), E1
);
5167 --------------------------------
5168 -- Same_Instantiated_Constant --
5169 --------------------------------
5171 function Same_Instantiated_Constant
5172 (E1
, E2
: Entity_Id
) return Boolean
5178 while Present
(Ent
) loop
5182 elsif Ekind
(Ent
) /= E_Constant
then
5185 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
5186 if Entity
(Constant_Value
(Ent
)) = E1
then
5189 Ent
:= Entity
(Constant_Value
(Ent
));
5192 -- The actual may be a constant that has been folded. Recover
5195 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
5196 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
5203 end Same_Instantiated_Constant
;
5205 --------------------------------
5206 -- Same_Instantiated_Variable --
5207 --------------------------------
5209 function Same_Instantiated_Variable
5210 (E1
, E2
: Entity_Id
) return Boolean
5212 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
5213 -- Follow chain of renamings to the ultimate ancestor
5215 ---------------------
5216 -- Original_Entity --
5217 ---------------------
5219 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
5224 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
5225 and then Present
(Renamed_Object
(Orig
))
5226 and then Is_Entity_Name
(Renamed_Object
(Orig
))
5228 Orig
:= Entity
(Renamed_Object
(Orig
));
5232 end Original_Entity
;
5234 -- Start of processing for Same_Instantiated_Variable
5237 return Ekind
(E1
) = Ekind
(E2
)
5238 and then Original_Entity
(E1
) = Original_Entity
(E2
);
5239 end Same_Instantiated_Variable
;
5241 -- Start of processing for Check_Formal_Package_Instance
5245 and then Present
(E2
)
5247 exit when Ekind
(E1
) = E_Package
5248 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
5250 -- If the formal is the renaming of the formal package, this
5251 -- is the end of its formal part, which may occur before the
5252 -- end of the formal part in the actual in the presence of
5253 -- defaulted parameters in the formal package.
5255 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
5256 and then Renamed_Entity
(E2
) = Scope
(E2
);
5258 -- The analysis of the actual may generate additional internal
5259 -- entities. If the formal is defaulted, there is no corresponding
5260 -- analysis and the internal entities must be skipped, until we
5261 -- find corresponding entities again.
5263 if Comes_From_Source
(E2
)
5264 and then not Comes_From_Source
(E1
)
5265 and then Chars
(E1
) /= Chars
(E2
)
5268 and then Chars
(E1
) /= Chars
(E2
)
5277 -- If the formal entity comes from a formal declaration, it was
5278 -- defaulted in the formal package, and no check is needed on it.
5280 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
5283 -- Ditto for defaulted formal subprograms.
5285 elsif Is_Overloadable
(E1
)
5286 and then Nkind
(Unit_Declaration_Node
(E2
)) in
5287 N_Formal_Subprogram_Declaration
5291 elsif Is_Type
(E1
) then
5293 -- Subtypes must statically match. E1, E2 are the local entities
5294 -- that are subtypes of the actuals. Itypes generated for other
5295 -- parameters need not be checked, the check will be performed
5296 -- on the parameters themselves.
5298 -- If E2 is a formal type declaration, it is a defaulted parameter
5299 -- and needs no checking.
5301 if not Is_Itype
(E1
)
5302 and then not Is_Itype
(E2
)
5306 or else Etype
(E1
) /= Etype
(E2
)
5307 or else not Subtypes_Statically_Match
(E1
, E2
));
5310 elsif Ekind
(E1
) = E_Constant
then
5312 -- IN parameters must denote the same static value, or the same
5313 -- constant, or the literal null.
5315 Expr1
:= Expression
(Parent
(E1
));
5317 if Ekind
(E2
) /= E_Constant
then
5318 Check_Mismatch
(True);
5321 Expr2
:= Expression
(Parent
(E2
));
5324 if Is_Static_Expression
(Expr1
) then
5326 if not Is_Static_Expression
(Expr2
) then
5327 Check_Mismatch
(True);
5329 elsif Is_Discrete_Type
(Etype
(E1
)) then
5331 V1
: constant Uint
:= Expr_Value
(Expr1
);
5332 V2
: constant Uint
:= Expr_Value
(Expr2
);
5334 Check_Mismatch
(V1
/= V2
);
5337 elsif Is_Real_Type
(Etype
(E1
)) then
5339 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
5340 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
5342 Check_Mismatch
(V1
/= V2
);
5345 elsif Is_String_Type
(Etype
(E1
))
5346 and then Nkind
(Expr1
) = N_String_Literal
5348 if Nkind
(Expr2
) /= N_String_Literal
then
5349 Check_Mismatch
(True);
5352 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
5356 elsif Is_Entity_Name
(Expr1
) then
5357 if Is_Entity_Name
(Expr2
) then
5358 if Entity
(Expr1
) = Entity
(Expr2
) then
5362 (not Same_Instantiated_Constant
5363 (Entity
(Expr1
), Entity
(Expr2
)));
5366 Check_Mismatch
(True);
5369 elsif Is_Entity_Name
(Original_Node
(Expr1
))
5370 and then Is_Entity_Name
(Expr2
)
5372 Same_Instantiated_Constant
5373 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
5377 elsif Nkind
(Expr1
) = N_Null
then
5378 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
5381 Check_Mismatch
(True);
5384 elsif Ekind
(E1
) = E_Variable
then
5385 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
5387 elsif Ekind
(E1
) = E_Package
then
5389 (Ekind
(E1
) /= Ekind
(E2
)
5390 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
5392 elsif Is_Overloadable
(E1
) then
5394 -- Verify that the actual subprograms match. Note that actuals
5395 -- that are attributes are rewritten as subprograms. If the
5396 -- subprogram in the formal package is defaulted, no check is
5397 -- needed. Note that this can only happen in Ada 2005 when the
5398 -- formal package can be partially parameterized.
5400 if Nkind
(Unit_Declaration_Node
(E1
)) =
5401 N_Subprogram_Renaming_Declaration
5402 and then From_Default
(Unit_Declaration_Node
(E1
))
5406 -- If the formal package has an "others" box association that
5407 -- covers this formal, there is no need for a check either.
5409 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
5410 N_Formal_Subprogram_Declaration
5411 and then Box_Present
(Unit_Declaration_Node
(E2
))
5415 -- No check needed if subprogram is a defaulted null procedure
5417 elsif No
(Alias
(E2
))
5418 and then Ekind
(E2
) = E_Procedure
5420 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
5424 -- Otherwise the actual in the formal and the actual in the
5425 -- instantiation of the formal must match, up to renamings.
5429 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
5433 raise Program_Error
;
5440 end Check_Formal_Package_Instance
;
5442 ---------------------------
5443 -- Check_Formal_Packages --
5444 ---------------------------
5446 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
5448 Formal_P
: Entity_Id
;
5451 -- Iterate through the declarations in the instance, looking for package
5452 -- renaming declarations that denote instances of formal packages. Stop
5453 -- when we find the renaming of the current package itself. The
5454 -- declaration for a formal package without a box is followed by an
5455 -- internal entity that repeats the instantiation.
5457 E
:= First_Entity
(P_Id
);
5458 while Present
(E
) loop
5459 if Ekind
(E
) = E_Package
then
5460 if Renamed_Object
(E
) = P_Id
then
5463 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
5466 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
5467 Formal_P
:= Next_Entity
(E
);
5468 Check_Formal_Package_Instance
(Formal_P
, E
);
5470 -- After checking, remove the internal validating package. It
5471 -- is only needed for semantic checks, and as it may contain
5472 -- generic formal declarations it should not reach gigi.
5474 Remove
(Unit_Declaration_Node
(Formal_P
));
5480 end Check_Formal_Packages
;
5482 ---------------------------------
5483 -- Check_Forward_Instantiation --
5484 ---------------------------------
5486 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
5488 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
5491 -- The instantiation appears before the generic body if we are in the
5492 -- scope of the unit containing the generic, either in its spec or in
5493 -- the package body, and before the generic body.
5495 if Ekind
(Gen_Comp
) = E_Package_Body
then
5496 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
5499 if In_Open_Scopes
(Gen_Comp
)
5500 and then No
(Corresponding_Body
(Decl
))
5505 and then not Is_Compilation_Unit
(S
)
5506 and then not Is_Child_Unit
(S
)
5508 if Ekind
(S
) = E_Package
then
5509 Set_Has_Forward_Instantiation
(S
);
5515 end Check_Forward_Instantiation
;
5517 ---------------------------
5518 -- Check_Generic_Actuals --
5519 ---------------------------
5521 -- The visibility of the actuals may be different between the point of
5522 -- generic instantiation and the instantiation of the body.
5524 procedure Check_Generic_Actuals
5525 (Instance
: Entity_Id
;
5526 Is_Formal_Box
: Boolean)
5531 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
5532 -- For a formal that is an array type, the component type is often a
5533 -- previous formal in the same unit. The privacy status of the component
5534 -- type will have been examined earlier in the traversal of the
5535 -- corresponding actuals, and this status should not be modified for
5536 -- the array (sub)type itself. However, if the base type of the array
5537 -- (sub)type is private, its full view must be restored in the body to
5538 -- be consistent with subsequent index subtypes, etc.
5540 -- To detect this case we have to rescan the list of formals, which is
5541 -- usually short enough to ignore the resulting inefficiency.
5543 -----------------------------
5544 -- Denotes_Previous_Actual --
5545 -----------------------------
5547 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
5551 Prev
:= First_Entity
(Instance
);
5552 while Present
(Prev
) loop
5554 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
5555 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
5556 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
5569 end Denotes_Previous_Actual
;
5571 -- Start of processing for Check_Generic_Actuals
5574 E
:= First_Entity
(Instance
);
5575 while Present
(E
) loop
5577 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
5578 and then Scope
(Etype
(E
)) /= Instance
5579 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
5581 if Is_Array_Type
(E
)
5582 and then not Is_Private_Type
(Etype
(E
))
5583 and then Denotes_Previous_Actual
(Component_Type
(E
))
5587 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
5590 Set_Is_Generic_Actual_Type
(E
, True);
5591 Set_Is_Hidden
(E
, False);
5592 Set_Is_Potentially_Use_Visible
(E
,
5595 -- We constructed the generic actual type as a subtype of the
5596 -- supplied type. This means that it normally would not inherit
5597 -- subtype specific attributes of the actual, which is wrong for
5598 -- the generic case.
5600 Astype
:= Ancestor_Subtype
(E
);
5604 -- This can happen when E is an itype that is the full view of
5605 -- a private type completed, e.g. with a constrained array. In
5606 -- that case, use the first subtype, which will carry size
5607 -- information. The base type itself is unconstrained and will
5610 Astype
:= First_Subtype
(E
);
5613 Set_Size_Info
(E
, (Astype
));
5614 Set_RM_Size
(E
, RM_Size
(Astype
));
5615 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
5617 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
5618 Set_RM_Size
(E
, RM_Size
(Astype
));
5620 -- In nested instances, the base type of an access actual may
5621 -- itself be private, and need to be exchanged.
5623 elsif Is_Access_Type
(E
)
5624 and then Is_Private_Type
(Etype
(E
))
5627 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
5630 elsif Ekind
(E
) = E_Package
then
5632 -- If this is the renaming for the current instance, we're done.
5633 -- Otherwise it is a formal package. If the corresponding formal
5634 -- was declared with a box, the (instantiations of the) generic
5635 -- formal part are also visible. Otherwise, ignore the entity
5636 -- created to validate the actuals.
5638 if Renamed_Object
(E
) = Instance
then
5641 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
5644 -- The visibility of a formal of an enclosing generic is already
5647 elsif Denotes_Formal_Package
(E
) then
5650 elsif Present
(Associated_Formal_Package
(E
))
5651 and then not Is_Generic_Formal
(E
)
5653 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
5654 Check_Generic_Actuals
(Renamed_Object
(E
), True);
5657 Check_Generic_Actuals
(Renamed_Object
(E
), False);
5660 Set_Is_Hidden
(E
, False);
5663 -- If this is a subprogram instance (in a wrapper package) the
5664 -- actual is fully visible.
5666 elsif Is_Wrapper_Package
(Instance
) then
5667 Set_Is_Hidden
(E
, False);
5669 -- If the formal package is declared with a box, or if the formal
5670 -- parameter is defaulted, it is visible in the body.
5673 or else Is_Visible_Formal
(E
)
5675 Set_Is_Hidden
(E
, False);
5678 if Ekind
(E
) = E_Constant
then
5680 -- If the type of the actual is a private type declared in the
5681 -- enclosing scope of the generic unit, the body of the generic
5682 -- sees the full view of the type (because it has to appear in
5683 -- the corresponding package body). If the type is private now,
5684 -- exchange views to restore the proper visiblity in the instance.
5687 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
5688 -- The type of the actual
5693 Parent_Scope
: Entity_Id
;
5694 -- The enclosing scope of the generic unit
5697 if Is_Wrapper_Package
(Instance
) then
5701 (Unit_Declaration_Node
5702 (Related_Instance
(Instance
))));
5705 Generic_Parent
(Package_Specification
(Instance
));
5708 Parent_Scope
:= Scope
(Gen_Id
);
5710 -- The exchange is only needed if the generic is defined
5711 -- within a package which is not a common ancestor of the
5712 -- scope of the instance, and is not already in scope.
5714 if Is_Private_Type
(Typ
)
5715 and then Scope
(Typ
) = Parent_Scope
5716 and then Scope
(Instance
) /= Parent_Scope
5717 and then Ekind
(Parent_Scope
) = E_Package
5718 and then not Is_Child_Unit
(Gen_Id
)
5722 -- If the type of the entity is a subtype, it may also have
5723 -- to be made visible, together with the base type of its
5724 -- full view, after exchange.
5726 if Is_Private_Type
(Etype
(E
)) then
5727 Switch_View
(Etype
(E
));
5728 Switch_View
(Base_Type
(Etype
(E
)));
5736 end Check_Generic_Actuals
;
5738 ------------------------------
5739 -- Check_Generic_Child_Unit --
5740 ------------------------------
5742 procedure Check_Generic_Child_Unit
5744 Parent_Installed
: in out Boolean)
5746 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
5747 Gen_Par
: Entity_Id
:= Empty
;
5749 Inst_Par
: Entity_Id
;
5752 function Find_Generic_Child
5754 Id
: Node_Id
) return Entity_Id
;
5755 -- Search generic parent for possible child unit with the given name
5757 function In_Enclosing_Instance
return Boolean;
5758 -- Within an instance of the parent, the child unit may be denoted by
5759 -- a simple name, or an abbreviated expanded name. Examine enclosing
5760 -- scopes to locate a possible parent instantiation.
5762 ------------------------
5763 -- Find_Generic_Child --
5764 ------------------------
5766 function Find_Generic_Child
5768 Id
: Node_Id
) return Entity_Id
5773 -- If entity of name is already set, instance has already been
5774 -- resolved, e.g. in an enclosing instantiation.
5776 if Present
(Entity
(Id
)) then
5777 if Scope
(Entity
(Id
)) = Scop
then
5784 E
:= First_Entity
(Scop
);
5785 while Present
(E
) loop
5786 if Chars
(E
) = Chars
(Id
)
5787 and then Is_Child_Unit
(E
)
5789 if Is_Child_Unit
(E
)
5790 and then not Is_Visible_Lib_Unit
(E
)
5793 ("generic child unit& is not visible", Gen_Id
, E
);
5805 end Find_Generic_Child
;
5807 ---------------------------
5808 -- In_Enclosing_Instance --
5809 ---------------------------
5811 function In_Enclosing_Instance
return Boolean is
5812 Enclosing_Instance
: Node_Id
;
5813 Instance_Decl
: Node_Id
;
5816 -- We do not inline any call that contains instantiations, except
5817 -- for instantiations of Unchecked_Conversion, so if we are within
5818 -- an inlined body the current instance does not require parents.
5820 if In_Inlined_Body
then
5821 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
5825 -- Loop to check enclosing scopes
5827 Enclosing_Instance
:= Current_Scope
;
5828 while Present
(Enclosing_Instance
) loop
5829 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
5831 if Ekind
(Enclosing_Instance
) = E_Package
5832 and then Is_Generic_Instance
(Enclosing_Instance
)
5834 (Generic_Parent
(Specification
(Instance_Decl
)))
5836 -- Check whether the generic we are looking for is a child of
5839 E
:= Find_Generic_Child
5840 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
5841 exit when Present
(E
);
5847 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
5859 Make_Expanded_Name
(Loc
,
5861 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
5862 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
5864 Set_Entity
(Gen_Id
, E
);
5865 Set_Etype
(Gen_Id
, Etype
(E
));
5866 Parent_Installed
:= False; -- Already in scope.
5869 end In_Enclosing_Instance
;
5871 -- Start of processing for Check_Generic_Child_Unit
5874 -- If the name of the generic is given by a selected component, it may
5875 -- be the name of a generic child unit, and the prefix is the name of an
5876 -- instance of the parent, in which case the child unit must be visible.
5877 -- If this instance is not in scope, it must be placed there and removed
5878 -- after instantiation, because what is being instantiated is not the
5879 -- original child, but the corresponding child present in the instance
5882 -- If the child is instantiated within the parent, it can be given by
5883 -- a simple name. In this case the instance is already in scope, but
5884 -- the child generic must be recovered from the generic parent as well.
5886 if Nkind
(Gen_Id
) = N_Selected_Component
then
5887 S
:= Selector_Name
(Gen_Id
);
5888 Analyze
(Prefix
(Gen_Id
));
5889 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5891 if Ekind
(Inst_Par
) = E_Package
5892 and then Present
(Renamed_Object
(Inst_Par
))
5894 Inst_Par
:= Renamed_Object
(Inst_Par
);
5897 if Ekind
(Inst_Par
) = E_Package
then
5898 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
5899 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
5901 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
5903 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
5905 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
5908 elsif Ekind
(Inst_Par
) = E_Generic_Package
5909 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
5911 -- A formal package may be a real child package, and not the
5912 -- implicit instance within a parent. In this case the child is
5913 -- not visible and has to be retrieved explicitly as well.
5915 Gen_Par
:= Inst_Par
;
5918 if Present
(Gen_Par
) then
5920 -- The prefix denotes an instantiation. The entity itself may be a
5921 -- nested generic, or a child unit.
5923 E
:= Find_Generic_Child
(Gen_Par
, S
);
5926 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
5927 Set_Entity
(Gen_Id
, E
);
5928 Set_Etype
(Gen_Id
, Etype
(E
));
5930 Set_Etype
(S
, Etype
(E
));
5932 -- Indicate that this is a reference to the parent
5934 if In_Extended_Main_Source_Unit
(Gen_Id
) then
5935 Set_Is_Instantiated
(Inst_Par
);
5938 -- A common mistake is to replicate the naming scheme of a
5939 -- hierarchy by instantiating a generic child directly, rather
5940 -- than the implicit child in a parent instance:
5942 -- generic .. package Gpar is ..
5943 -- generic .. package Gpar.Child is ..
5944 -- package Par is new Gpar ();
5947 -- package Par.Child is new Gpar.Child ();
5948 -- rather than Par.Child
5950 -- In this case the instantiation is within Par, which is an
5951 -- instance, but Gpar does not denote Par because we are not IN
5952 -- the instance of Gpar, so this is illegal. The test below
5953 -- recognizes this particular case.
5955 if Is_Child_Unit
(E
)
5956 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
5957 and then (not In_Instance
5958 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
5962 ("prefix of generic child unit must be instance of parent",
5966 if not In_Open_Scopes
(Inst_Par
)
5967 and then Nkind
(Parent
(Gen_Id
)) not in
5968 N_Generic_Renaming_Declaration
5970 Install_Parent
(Inst_Par
);
5971 Parent_Installed
:= True;
5973 elsif In_Open_Scopes
(Inst_Par
) then
5975 -- If the parent is already installed, install the actuals
5976 -- for its formal packages. This is necessary when the child
5977 -- instance is a child of the parent instance: in this case,
5978 -- the parent is placed on the scope stack but the formal
5979 -- packages are not made visible.
5981 Install_Formal_Packages
(Inst_Par
);
5985 -- If the generic parent does not contain an entity that
5986 -- corresponds to the selector, the instance doesn't either.
5987 -- Analyzing the node will yield the appropriate error message.
5988 -- If the entity is not a child unit, then it is an inner
5989 -- generic in the parent.
5997 if Is_Child_Unit
(Entity
(Gen_Id
))
5999 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6000 and then not In_Open_Scopes
(Inst_Par
)
6002 Install_Parent
(Inst_Par
);
6003 Parent_Installed
:= True;
6005 -- The generic unit may be the renaming of the implicit child
6006 -- present in an instance. In that case the parent instance is
6007 -- obtained from the name of the renamed entity.
6009 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
6010 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
6011 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
6014 Renamed_Package
: constant Node_Id
:=
6015 Name
(Parent
(Entity
(Gen_Id
)));
6017 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
6018 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
6019 Install_Parent
(Inst_Par
);
6020 Parent_Installed
:= True;
6026 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
6028 -- Entity already present, analyze prefix, whose meaning may be
6029 -- an instance in the current context. If it is an instance of
6030 -- a relative within another, the proper parent may still have
6031 -- to be installed, if they are not of the same generation.
6033 Analyze
(Prefix
(Gen_Id
));
6035 -- In the unlikely case that a local declaration hides the name
6036 -- of the parent package, locate it on the homonym chain. If the
6037 -- context is an instance of the parent, the renaming entity is
6040 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6041 while Present
(Inst_Par
)
6042 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
6044 Inst_Par
:= Homonym
(Inst_Par
);
6047 pragma Assert
(Present
(Inst_Par
));
6048 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
6050 if In_Enclosing_Instance
then
6053 elsif Present
(Entity
(Gen_Id
))
6054 and then Is_Child_Unit
(Entity
(Gen_Id
))
6055 and then not In_Open_Scopes
(Inst_Par
)
6057 Install_Parent
(Inst_Par
);
6058 Parent_Installed
:= True;
6061 elsif In_Enclosing_Instance
then
6063 -- The child unit is found in some enclosing scope
6070 -- If this is the renaming of the implicit child in a parent
6071 -- instance, recover the parent name and install it.
6073 if Is_Entity_Name
(Gen_Id
) then
6074 E
:= Entity
(Gen_Id
);
6076 if Is_Generic_Unit
(E
)
6077 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
6078 and then Is_Child_Unit
(Renamed_Object
(E
))
6079 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
6080 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
6083 New_Copy_Tree
(Name
(Parent
(E
))));
6084 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6086 if not In_Open_Scopes
(Inst_Par
) then
6087 Install_Parent
(Inst_Par
);
6088 Parent_Installed
:= True;
6091 -- If it is a child unit of a non-generic parent, it may be
6092 -- use-visible and given by a direct name. Install parent as
6095 elsif Is_Generic_Unit
(E
)
6096 and then Is_Child_Unit
(E
)
6098 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6099 and then not Is_Generic_Unit
(Scope
(E
))
6101 if not In_Open_Scopes
(Scope
(E
)) then
6102 Install_Parent
(Scope
(E
));
6103 Parent_Installed
:= True;
6108 end Check_Generic_Child_Unit
;
6110 -----------------------------
6111 -- Check_Hidden_Child_Unit --
6112 -----------------------------
6114 procedure Check_Hidden_Child_Unit
6116 Gen_Unit
: Entity_Id
;
6117 Act_Decl_Id
: Entity_Id
)
6119 Gen_Id
: constant Node_Id
:= Name
(N
);
6122 if Is_Child_Unit
(Gen_Unit
)
6123 and then Is_Child_Unit
(Act_Decl_Id
)
6124 and then Nkind
(Gen_Id
) = N_Expanded_Name
6125 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
6126 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
6128 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
6130 ("generic unit & is implicitly declared in &",
6131 Defining_Unit_Name
(N
), Gen_Unit
);
6132 Error_Msg_N
("\instance must have different name",
6133 Defining_Unit_Name
(N
));
6135 end Check_Hidden_Child_Unit
;
6137 ------------------------
6138 -- Check_Private_View --
6139 ------------------------
6141 procedure Check_Private_View
(N
: Node_Id
) is
6142 T
: constant Entity_Id
:= Etype
(N
);
6146 -- Exchange views if the type was not private in the generic but is
6147 -- private at the point of instantiation. Do not exchange views if
6148 -- the scope of the type is in scope. This can happen if both generic
6149 -- and instance are sibling units, or if type is defined in a parent.
6150 -- In this case the visibility of the type will be correct for all
6154 BT
:= Base_Type
(T
);
6156 if Is_Private_Type
(T
)
6157 and then not Has_Private_View
(N
)
6158 and then Present
(Full_View
(T
))
6159 and then not In_Open_Scopes
(Scope
(T
))
6161 -- In the generic, the full type was visible. Save the private
6162 -- entity, for subsequent exchange.
6166 elsif Has_Private_View
(N
)
6167 and then not Is_Private_Type
(T
)
6168 and then not Has_Been_Exchanged
(T
)
6169 and then Etype
(Get_Associated_Node
(N
)) /= T
6171 -- Only the private declaration was visible in the generic. If
6172 -- the type appears in a subtype declaration, the subtype in the
6173 -- instance must have a view compatible with that of its parent,
6174 -- which must be exchanged (see corresponding code in Restore_
6175 -- Private_Views). Otherwise, if the type is defined in a parent
6176 -- unit, leave full visibility within instance, which is safe.
6178 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
6179 and then not Is_Private_Type
(Base_Type
(T
))
6180 and then Comes_From_Source
(Base_Type
(T
))
6184 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
6185 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
6187 Prepend_Elmt
(T
, Exchanged_Views
);
6188 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
6191 -- For composite types with inconsistent representation exchange
6192 -- component types accordingly.
6194 elsif Is_Access_Type
(T
)
6195 and then Is_Private_Type
(Designated_Type
(T
))
6196 and then not Has_Private_View
(N
)
6197 and then Present
(Full_View
(Designated_Type
(T
)))
6199 Switch_View
(Designated_Type
(T
));
6201 elsif Is_Array_Type
(T
) then
6202 if Is_Private_Type
(Component_Type
(T
))
6203 and then not Has_Private_View
(N
)
6204 and then Present
(Full_View
(Component_Type
(T
)))
6206 Switch_View
(Component_Type
(T
));
6209 -- The normal exchange mechanism relies on the setting of a
6210 -- flag on the reference in the generic. However, an additional
6211 -- mechanism is needed for types that are not explicitly
6212 -- mentioned in the generic, but may be needed in expanded code
6213 -- in the instance. This includes component types of arrays and
6214 -- designated types of access types. This processing must also
6215 -- include the index types of arrays which we take care of here.
6222 Indx
:= First_Index
(T
);
6223 while Present
(Indx
) loop
6224 Typ
:= Base_Type
(Etype
(Indx
));
6226 if Is_Private_Type
(Typ
)
6227 and then Present
(Full_View
(Typ
))
6236 elsif Is_Private_Type
(T
)
6237 and then Present
(Full_View
(T
))
6238 and then Is_Array_Type
(Full_View
(T
))
6239 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
6243 -- Finally, a non-private subtype may have a private base type, which
6244 -- must be exchanged for consistency. This can happen when a package
6245 -- body is instantiated, when the scope stack is empty but in fact
6246 -- the subtype and the base type are declared in an enclosing scope.
6248 -- Note that in this case we introduce an inconsistency in the view
6249 -- set, because we switch the base type BT, but there could be some
6250 -- private dependent subtypes of BT which remain unswitched. Such
6251 -- subtypes might need to be switched at a later point (see specific
6252 -- provision for that case in Switch_View).
6254 elsif not Is_Private_Type
(T
)
6255 and then not Has_Private_View
(N
)
6256 and then Is_Private_Type
(BT
)
6257 and then Present
(Full_View
(BT
))
6258 and then not Is_Generic_Type
(BT
)
6259 and then not In_Open_Scopes
(BT
)
6261 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
6262 Exchange_Declarations
(BT
);
6265 end Check_Private_View
;
6267 -----------------------------
6268 -- Check_Hidden_Primitives --
6269 -----------------------------
6271 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
6274 Result
: Elist_Id
:= No_Elist
;
6277 if No
(Assoc_List
) then
6281 -- Traverse the list of associations between formals and actuals
6282 -- searching for renamings of tagged types
6284 Actual
:= First
(Assoc_List
);
6285 while Present
(Actual
) loop
6286 if Nkind
(Actual
) = N_Subtype_Declaration
then
6287 Gen_T
:= Generic_Parent_Type
(Actual
);
6290 and then Is_Tagged_Type
(Gen_T
)
6292 -- Traverse the list of primitives of the actual types
6293 -- searching for hidden primitives that are visible in the
6294 -- corresponding generic formal; leave them visible and
6295 -- append them to Result to restore their decoration later.
6297 Install_Hidden_Primitives
6298 (Prims_List
=> Result
,
6300 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
6308 end Check_Hidden_Primitives
;
6310 --------------------------
6311 -- Contains_Instance_Of --
6312 --------------------------
6314 function Contains_Instance_Of
6317 N
: Node_Id
) return Boolean
6325 -- Verify that there are no circular instantiations. We check whether
6326 -- the unit contains an instance of the current scope or some enclosing
6327 -- scope (in case one of the instances appears in a subunit). Longer
6328 -- circularities involving subunits might seem too pathological to
6329 -- consider, but they were not too pathological for the authors of
6330 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6331 -- enclosing generic scopes as containing an instance.
6334 -- Within a generic subprogram body, the scope is not generic, to
6335 -- allow for recursive subprograms. Use the declaration to determine
6336 -- whether this is a generic unit.
6338 if Ekind
(Scop
) = E_Generic_Package
6339 or else (Is_Subprogram
(Scop
)
6340 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
6341 N_Generic_Subprogram_Declaration
)
6343 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
6345 while Present
(Elmt
) loop
6346 if Node
(Elmt
) = Scop
then
6347 Error_Msg_Node_2
:= Inner
;
6349 ("circular Instantiation: & instantiated within &!",
6353 elsif Node
(Elmt
) = Inner
then
6356 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
6357 Error_Msg_Node_2
:= Inner
;
6359 ("circular Instantiation: & instantiated within &!",
6367 -- Indicate that Inner is being instantiated within Scop
6369 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
6372 if Scop
= Standard_Standard
then
6375 Scop
:= Scope
(Scop
);
6380 end Contains_Instance_Of
;
6382 -----------------------
6383 -- Copy_Generic_Node --
6384 -----------------------
6386 function Copy_Generic_Node
6388 Parent_Id
: Node_Id
;
6389 Instantiating
: Boolean) return Node_Id
6394 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
6395 -- Check the given value of one of the Fields referenced by the current
6396 -- node to determine whether to copy it recursively. The field may hold
6397 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
6398 -- Char) in which case it need not be copied.
6400 procedure Copy_Descendants
;
6401 -- Common utility for various nodes
6403 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
6404 -- Make copy of element list
6406 function Copy_Generic_List
6408 Parent_Id
: Node_Id
) return List_Id
;
6409 -- Apply Copy_Node recursively to the members of a node list
6411 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
6412 -- True if an identifier is part of the defining program unit name of
6413 -- a child unit. The entity of such an identifier must be kept (for
6414 -- ASIS use) even though as the name of an enclosing generic it would
6415 -- otherwise not be preserved in the generic tree.
6417 ----------------------
6418 -- Copy_Descendants --
6419 ----------------------
6421 procedure Copy_Descendants
is
6423 use Atree
.Unchecked_Access
;
6424 -- This code section is part of the implementation of an untyped
6425 -- tree traversal, so it needs direct access to node fields.
6428 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6429 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6430 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6431 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
6432 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6433 end Copy_Descendants
;
6435 -----------------------------
6436 -- Copy_Generic_Descendant --
6437 -----------------------------
6439 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
6441 if D
= Union_Id
(Empty
) then
6444 elsif D
in Node_Range
then
6446 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
6448 elsif D
in List_Range
then
6449 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
6451 elsif D
in Elist_Range
then
6452 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
6454 -- Nothing else is copyable (e.g. Uint values), return as is
6459 end Copy_Generic_Descendant
;
6461 ------------------------
6462 -- Copy_Generic_Elist --
6463 ------------------------
6465 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
6472 M
:= First_Elmt
(E
);
6473 while Present
(M
) loop
6475 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
6484 end Copy_Generic_Elist
;
6486 -----------------------
6487 -- Copy_Generic_List --
6488 -----------------------
6490 function Copy_Generic_List
6492 Parent_Id
: Node_Id
) return List_Id
6500 Set_Parent
(New_L
, Parent_Id
);
6503 while Present
(N
) loop
6504 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
6513 end Copy_Generic_List
;
6515 ---------------------------
6516 -- In_Defining_Unit_Name --
6517 ---------------------------
6519 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
6521 return Present
(Parent
(Nam
))
6522 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
6524 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
6525 and then In_Defining_Unit_Name
(Parent
(Nam
))));
6526 end In_Defining_Unit_Name
;
6528 -- Start of processing for Copy_Generic_Node
6535 New_N
:= New_Copy
(N
);
6537 -- Copy aspects if present
6539 if Has_Aspects
(N
) then
6540 Set_Has_Aspects
(New_N
, False);
6541 Set_Aspect_Specifications
6542 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
6545 if Instantiating
then
6546 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
6549 if not Is_List_Member
(N
) then
6550 Set_Parent
(New_N
, Parent_Id
);
6553 -- If defining identifier, then all fields have been copied already
6555 if Nkind
(New_N
) in N_Entity
then
6558 -- Special casing for identifiers and other entity names and operators
6560 elsif Nkind_In
(New_N
, N_Identifier
,
6561 N_Character_Literal
,
6564 or else Nkind
(New_N
) in N_Op
6566 if not Instantiating
then
6568 -- Link both nodes in order to assign subsequently the entity of
6569 -- the copy to the original node, in case this is a global
6572 Set_Associated_Node
(N
, New_N
);
6574 -- If we are within an instantiation, this is a nested generic
6575 -- that has already been analyzed at the point of definition.
6576 -- We must preserve references that were global to the enclosing
6577 -- parent at that point. Other occurrences, whether global or
6578 -- local to the current generic, must be resolved anew, so we
6579 -- reset the entity in the generic copy. A global reference has a
6580 -- smaller depth than the parent, or else the same depth in case
6581 -- both are distinct compilation units.
6583 -- A child unit is implicitly declared within the enclosing parent
6584 -- but is in fact global to it, and must be preserved.
6586 -- It is also possible for Current_Instantiated_Parent to be
6587 -- defined, and for this not to be a nested generic, namely if
6588 -- the unit is loaded through Rtsfind. In that case, the entity of
6589 -- New_N is only a link to the associated node, and not a defining
6592 -- The entities for parent units in the defining_program_unit of a
6593 -- generic child unit are established when the context of the unit
6594 -- is first analyzed, before the generic copy is made. They are
6595 -- preserved in the copy for use in ASIS queries.
6597 Ent
:= Entity
(New_N
);
6599 if No
(Current_Instantiated_Parent
.Gen_Id
) then
6601 or else Nkind
(Ent
) /= N_Defining_Identifier
6602 or else not In_Defining_Unit_Name
(N
)
6604 Set_Associated_Node
(New_N
, Empty
);
6609 not Nkind_In
(Ent
, N_Defining_Identifier
,
6610 N_Defining_Character_Literal
,
6611 N_Defining_Operator_Symbol
)
6612 or else No
(Scope
(Ent
))
6614 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
6615 and then not Is_Child_Unit
(Ent
))
6617 (Scope_Depth
(Scope
(Ent
)) >
6618 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
6620 Get_Source_Unit
(Ent
) =
6621 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
6623 Set_Associated_Node
(New_N
, Empty
);
6626 -- Case of instantiating identifier or some other name or operator
6629 -- If the associated node is still defined, the entity in it
6630 -- is global, and must be copied to the instance. If this copy
6631 -- is being made for a body to inline, it is applied to an
6632 -- instantiated tree, and the entity is already present and
6633 -- must be also preserved.
6636 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
6639 if Present
(Assoc
) then
6640 if Nkind
(Assoc
) = Nkind
(N
) then
6641 Set_Entity
(New_N
, Entity
(Assoc
));
6642 Check_Private_View
(N
);
6644 -- The name in the call may be a selected component if the
6645 -- call has not been analyzed yet, as may be the case for
6646 -- pre/post conditions in a generic unit.
6648 elsif Nkind
(Assoc
) = N_Function_Call
6649 and then Is_Entity_Name
(Name
(Assoc
))
6651 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
6653 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
6654 N_Defining_Character_Literal
,
6655 N_Defining_Operator_Symbol
)
6656 and then Expander_Active
6658 -- Inlining case: we are copying a tree that contains
6659 -- global entities, which are preserved in the copy to be
6660 -- used for subsequent inlining.
6665 Set_Entity
(New_N
, Empty
);
6671 -- For expanded name, we must copy the Prefix and Selector_Name
6673 if Nkind
(N
) = N_Expanded_Name
then
6675 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
6677 Set_Selector_Name
(New_N
,
6678 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
6680 -- For operators, we must copy the right operand
6682 elsif Nkind
(N
) in N_Op
then
6683 Set_Right_Opnd
(New_N
,
6684 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
6686 -- And for binary operators, the left operand as well
6688 if Nkind
(N
) in N_Binary_Op
then
6689 Set_Left_Opnd
(New_N
,
6690 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
6694 -- Special casing for stubs
6696 elsif Nkind
(N
) in N_Body_Stub
then
6698 -- In any case, we must copy the specification or defining
6699 -- identifier as appropriate.
6701 if Nkind
(N
) = N_Subprogram_Body_Stub
then
6702 Set_Specification
(New_N
,
6703 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
6706 Set_Defining_Identifier
(New_N
,
6708 (Defining_Identifier
(N
), New_N
, Instantiating
));
6711 -- If we are not instantiating, then this is where we load and
6712 -- analyze subunits, i.e. at the point where the stub occurs. A
6713 -- more permissive system might defer this analysis to the point
6714 -- of instantiation, but this seems too complicated for now.
6716 if not Instantiating
then
6718 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
6720 Unum
: Unit_Number_Type
;
6724 -- Make sure that, if it is a subunit of the main unit that is
6725 -- preprocessed and if -gnateG is specified, the preprocessed
6726 -- file will be written.
6728 Lib
.Analysing_Subunit_Of_Main
:=
6729 Lib
.In_Extended_Main_Source_Unit
(N
);
6732 (Load_Name
=> Subunit_Name
,
6736 Lib
.Analysing_Subunit_Of_Main
:= False;
6738 -- If the proper body is not found, a warning message will be
6739 -- emitted when analyzing the stub, or later at the point of
6740 -- instantiation. Here we just leave the stub as is.
6742 if Unum
= No_Unit
then
6743 Subunits_Missing
:= True;
6744 goto Subunit_Not_Found
;
6747 Subunit
:= Cunit
(Unum
);
6749 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
6751 ("found child unit instead of expected SEPARATE subunit",
6753 Error_Msg_Sloc
:= Sloc
(N
);
6754 Error_Msg_N
("\to complete stub #", Subunit
);
6755 goto Subunit_Not_Found
;
6758 -- We must create a generic copy of the subunit, in order to
6759 -- perform semantic analysis on it, and we must replace the
6760 -- stub in the original generic unit with the subunit, in order
6761 -- to preserve non-local references within.
6763 -- Only the proper body needs to be copied. Library_Unit and
6764 -- context clause are simply inherited by the generic copy.
6765 -- Note that the copy (which may be recursive if there are
6766 -- nested subunits) must be done first, before attaching it to
6767 -- the enclosing generic.
6771 (Proper_Body
(Unit
(Subunit
)),
6772 Empty
, Instantiating
=> False);
6774 -- Now place the original proper body in the original generic
6775 -- unit. This is a body, not a compilation unit.
6777 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
6778 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
6779 Set_Was_Originally_Stub
(N
);
6781 -- Finally replace the body of the subunit with its copy, and
6782 -- make this new subunit into the library unit of the generic
6783 -- copy, which does not have stubs any longer.
6785 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
6786 Set_Library_Unit
(New_N
, Subunit
);
6787 Inherit_Context
(Unit
(Subunit
), N
);
6790 -- If we are instantiating, this must be an error case, since
6791 -- otherwise we would have replaced the stub node by the proper body
6792 -- that corresponds. So just ignore it in the copy (i.e. we have
6793 -- copied it, and that is good enough).
6799 <<Subunit_Not_Found
>> null;
6801 -- If the node is a compilation unit, it is the subunit of a stub, which
6802 -- has been loaded already (see code below). In this case, the library
6803 -- unit field of N points to the parent unit (which is a compilation
6804 -- unit) and need not (and cannot) be copied.
6806 -- When the proper body of the stub is analyzed, the library_unit link
6807 -- is used to establish the proper context (see sem_ch10).
6809 -- The other fields of a compilation unit are copied as usual
6811 elsif Nkind
(N
) = N_Compilation_Unit
then
6813 -- This code can only be executed when not instantiating, because in
6814 -- the copy made for an instantiation, the compilation unit node has
6815 -- disappeared at the point that a stub is replaced by its proper
6818 pragma Assert
(not Instantiating
);
6820 Set_Context_Items
(New_N
,
6821 Copy_Generic_List
(Context_Items
(N
), New_N
));
6824 Copy_Generic_Node
(Unit
(N
), New_N
, False));
6826 Set_First_Inlined_Subprogram
(New_N
,
6828 (First_Inlined_Subprogram
(N
), New_N
, False));
6830 Set_Aux_Decls_Node
(New_N
,
6831 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
6833 -- For an assignment node, the assignment is known to be semantically
6834 -- legal if we are instantiating the template. This avoids incorrect
6835 -- diagnostics in generated code.
6837 elsif Nkind
(N
) = N_Assignment_Statement
then
6839 -- Copy name and expression fields in usual manner
6842 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
6844 Set_Expression
(New_N
,
6845 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
6847 if Instantiating
then
6848 Set_Assignment_OK
(Name
(New_N
), True);
6851 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
6852 if not Instantiating
then
6853 Set_Associated_Node
(N
, New_N
);
6856 if Present
(Get_Associated_Node
(N
))
6857 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
6859 -- In the generic the aggregate has some composite type. If at
6860 -- the point of instantiation the type has a private view,
6861 -- install the full view (and that of its ancestors, if any).
6864 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
6869 and then Is_Private_Type
(T
)
6875 and then Is_Tagged_Type
(T
)
6876 and then Is_Derived_Type
(T
)
6878 Rt
:= Root_Type
(T
);
6883 if Is_Private_Type
(T
) then
6894 -- Do not copy the associated node, which points to the generic copy
6895 -- of the aggregate.
6898 use Atree
.Unchecked_Access
;
6899 -- This code section is part of the implementation of an untyped
6900 -- tree traversal, so it needs direct access to node fields.
6903 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6904 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6905 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6906 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6909 -- Allocators do not have an identifier denoting the access type, so we
6910 -- must locate it through the expression to check whether the views are
6913 elsif Nkind
(N
) = N_Allocator
6914 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
6915 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
6916 and then Instantiating
6919 T
: constant Node_Id
:=
6920 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
6926 -- Retrieve the allocator node in the generic copy
6928 Acc_T
:= Etype
(Parent
(Parent
(T
)));
6930 and then Is_Private_Type
(Acc_T
)
6932 Switch_View
(Acc_T
);
6939 -- For a proper body, we must catch the case of a proper body that
6940 -- replaces a stub. This represents the point at which a separate
6941 -- compilation unit, and hence template file, may be referenced, so we
6942 -- must make a new source instantiation entry for the template of the
6943 -- subunit, and ensure that all nodes in the subunit are adjusted using
6944 -- this new source instantiation entry.
6946 elsif Nkind
(N
) in N_Proper_Body
then
6948 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
6951 if Instantiating
and then Was_Originally_Stub
(N
) then
6952 Create_Instantiation_Source
6953 (Instantiation_Node
,
6954 Defining_Entity
(N
),
6959 -- Now copy the fields of the proper body, using the new
6960 -- adjustment factor if one was needed as per test above.
6964 -- Restore the original adjustment factor in case changed
6966 S_Adjustment
:= Save_Adjustment
;
6969 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6970 -- generic unit, not to the instantiating unit.
6972 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
6974 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
6976 if Prag_Id
= Pragma_Ident
or else Prag_Id
= Pragma_Comment
then
6977 New_N
:= Make_Null_Statement
(Sloc
(N
));
6983 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
6985 -- No descendant fields need traversing
6989 elsif Nkind
(N
) = N_String_Literal
6990 and then Present
(Etype
(N
))
6991 and then Instantiating
6993 -- If the string is declared in an outer scope, the string_literal
6994 -- subtype created for it may have the wrong scope. We force the
6995 -- reanalysis of the constant to generate a new itype in the proper
6998 Set_Etype
(New_N
, Empty
);
6999 Set_Analyzed
(New_N
, False);
7001 -- For the remaining nodes, copy their descendants recursively
7006 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
7007 Set_Generic_Parent
(Specification
(New_N
), N
);
7009 -- Should preserve Corresponding_Spec??? (12.3(14))
7014 end Copy_Generic_Node
;
7016 ----------------------------
7017 -- Denotes_Formal_Package --
7018 ----------------------------
7020 function Denotes_Formal_Package
7022 On_Exit
: Boolean := False;
7023 Instance
: Entity_Id
:= Empty
) return Boolean
7026 Scop
: constant Entity_Id
:= Scope
(Pack
);
7029 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
7030 -- The package in question may be an actual for a previous formal
7031 -- package P of the current instance, so examine its actuals as well.
7032 -- This must be recursive over other formal packages.
7034 ----------------------------------
7035 -- Is_Actual_Of_Previous_Formal --
7036 ----------------------------------
7038 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
7042 E1
:= First_Entity
(P
);
7043 while Present
(E1
) and then E1
/= Instance
loop
7044 if Ekind
(E1
) = E_Package
7045 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
7047 if Renamed_Object
(E1
) = Pack
then
7050 elsif E1
= P
or else Renamed_Object
(E1
) = P
then
7053 elsif Is_Actual_Of_Previous_Formal
(E1
) then
7062 end Is_Actual_Of_Previous_Formal
;
7064 -- Start of processing for Denotes_Formal_Package
7070 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
7072 Par
:= Current_Instantiated_Parent
.Act_Id
;
7075 if Ekind
(Scop
) = E_Generic_Package
7076 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
7077 N_Generic_Subprogram_Declaration
7081 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
7082 N_Formal_Package_Declaration
7090 -- Check whether this package is associated with a formal package of
7091 -- the enclosing instantiation. Iterate over the list of renamings.
7093 E
:= First_Entity
(Par
);
7094 while Present
(E
) loop
7095 if Ekind
(E
) /= E_Package
7096 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
7100 elsif Renamed_Object
(E
) = Par
then
7103 elsif Renamed_Object
(E
) = Pack
then
7106 elsif Is_Actual_Of_Previous_Formal
(E
) then
7116 end Denotes_Formal_Package
;
7122 procedure End_Generic
is
7124 -- ??? More things could be factored out in this routine. Should
7125 -- probably be done at a later stage.
7127 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
7128 Generic_Flags
.Decrement_Last
;
7130 Expander_Mode_Restore
;
7137 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
7138 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
7139 -- Find distance from given node to enclosing compilation unit
7145 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
7148 and then Nkind
(P
) /= N_Compilation_Unit
7150 P
:= True_Parent
(P
);
7155 -- Local declarations
7164 -- Start of processing for Earlier
7167 Find_Depth
(P1
, D1
);
7168 Find_Depth
(P2
, D2
);
7178 P1
:= True_Parent
(P1
);
7183 P2
:= True_Parent
(P2
);
7187 -- At this point P1 and P2 are at the same distance from the root.
7188 -- We examine their parents until we find a common declarative list.
7189 -- If we reach the root, N1 and N2 do not descend from the same
7190 -- declarative list (e.g. one is nested in the declarative part and
7191 -- the other is in a block in the statement part) and the earlier
7192 -- one is already frozen.
7194 while not Is_List_Member
(P1
)
7195 or else not Is_List_Member
(P2
)
7196 or else List_Containing
(P1
) /= List_Containing
(P2
)
7198 P1
:= True_Parent
(P1
);
7199 P2
:= True_Parent
(P2
);
7201 if Nkind
(Parent
(P1
)) = N_Subunit
then
7202 P1
:= Corresponding_Stub
(Parent
(P1
));
7205 if Nkind
(Parent
(P2
)) = N_Subunit
then
7206 P2
:= Corresponding_Stub
(Parent
(P2
));
7214 -- Expanded code usually shares the source location of the original
7215 -- construct it was generated for. This however may not necessarely
7216 -- reflect the true location of the code within the tree.
7218 -- Before comparing the slocs of the two nodes, make sure that we are
7219 -- working with correct source locations. Assume that P1 is to the left
7220 -- of P2. If either one does not come from source, traverse the common
7221 -- list heading towards the other node and locate the first source
7225 -- ----+===+===+--------------+===+===+----
7226 -- expanded code expanded code
7228 if not Comes_From_Source
(P1
) then
7229 while Present
(P1
) loop
7231 -- Neither P2 nor a source statement were located during the
7232 -- search. If we reach the end of the list, then P1 does not
7233 -- occur earlier than P2.
7236 -- start --- P2 ----- P1 --- end
7238 if No
(Next
(P1
)) then
7241 -- We encounter P2 while going to the right of the list. This
7242 -- means that P1 does indeed appear earlier.
7245 -- start --- P1 ===== P2 --- end
7246 -- expanded code in between
7251 -- No need to look any further since we have located a source
7254 elsif Comes_From_Source
(P1
) then
7264 if not Comes_From_Source
(P2
) then
7265 while Present
(P2
) loop
7267 -- Neither P1 nor a source statement were located during the
7268 -- search. If we reach the start of the list, then P1 does not
7269 -- occur earlier than P2.
7272 -- start --- P2 --- P1 --- end
7274 if No
(Prev
(P2
)) then
7277 -- We encounter P1 while going to the left of the list. This
7278 -- means that P1 does indeed appear earlier.
7281 -- start --- P1 ===== P2 --- end
7282 -- expanded code in between
7287 -- No need to look any further since we have located a source
7290 elsif Comes_From_Source
(P2
) then
7300 -- At this point either both nodes came from source or we approximated
7301 -- their source locations through neighbouring source statements.
7303 T1
:= Top_Level_Location
(Sloc
(P1
));
7304 T2
:= Top_Level_Location
(Sloc
(P2
));
7306 -- When two nodes come from the same instance, they have identical top
7307 -- level locations. To determine proper relation within the tree, check
7308 -- their locations within the template.
7311 return Sloc
(P1
) < Sloc
(P2
);
7313 -- The two nodes either come from unrelated instances or do not come
7314 -- from instantiated code at all.
7321 ----------------------
7322 -- Find_Actual_Type --
7323 ----------------------
7325 function Find_Actual_Type
7327 Gen_Type
: Entity_Id
) return Entity_Id
7329 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
7333 -- Special processing only applies to child units
7335 if not Is_Child_Unit
(Gen_Scope
) then
7336 return Get_Instance_Of
(Typ
);
7338 -- If designated or component type is itself a formal of the child unit,
7339 -- its instance is available.
7341 elsif Scope
(Typ
) = Gen_Scope
then
7342 return Get_Instance_Of
(Typ
);
7344 -- If the array or access type is not declared in the parent unit,
7345 -- no special processing needed.
7347 elsif not Is_Generic_Type
(Typ
)
7348 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
7350 return Get_Instance_Of
(Typ
);
7352 -- Otherwise, retrieve designated or component type by visibility
7355 T
:= Current_Entity
(Typ
);
7356 while Present
(T
) loop
7357 if In_Open_Scopes
(Scope
(T
)) then
7360 elsif Is_Generic_Actual_Type
(T
) then
7369 end Find_Actual_Type
;
7371 ----------------------------
7372 -- Freeze_Subprogram_Body --
7373 ----------------------------
7375 procedure Freeze_Subprogram_Body
7376 (Inst_Node
: Node_Id
;
7378 Pack_Id
: Entity_Id
)
7380 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7381 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
7387 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
7388 -- Find innermost package body that encloses the given node, and which
7389 -- is not a compilation unit. Freeze nodes for the instance, or for its
7390 -- enclosing body, may be inserted after the enclosing_body of the
7391 -- generic unit. Used to determine proper placement of freeze node for
7392 -- both package and subprogram instances.
7394 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
7395 -- Find entity for given package body, and locate or create a freeze
7398 ----------------------------
7399 -- Enclosing_Package_Body --
7400 ----------------------------
7402 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
7408 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
7410 if Nkind
(P
) = N_Package_Body
then
7411 if Nkind
(Parent
(P
)) = N_Subunit
then
7412 return Corresponding_Stub
(Parent
(P
));
7418 P
:= True_Parent
(P
);
7422 end Enclosing_Package_Body
;
7424 -------------------------
7425 -- Package_Freeze_Node --
7426 -------------------------
7428 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
7432 if Nkind
(B
) = N_Package_Body
then
7433 Id
:= Corresponding_Spec
(B
);
7434 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
7435 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
7438 Ensure_Freeze_Node
(Id
);
7439 return Freeze_Node
(Id
);
7440 end Package_Freeze_Node
;
7442 -- Start of processing of Freeze_Subprogram_Body
7445 -- If the instance and the generic body appear within the same unit, and
7446 -- the instance precedes the generic, the freeze node for the instance
7447 -- must appear after that of the generic. If the generic is nested
7448 -- within another instance I2, then current instance must be frozen
7449 -- after I2. In both cases, the freeze nodes are those of enclosing
7450 -- packages. Otherwise, the freeze node is placed at the end of the
7451 -- current declarative part.
7453 Enc_G
:= Enclosing_Package_Body
(Gen_Body
);
7454 Enc_I
:= Enclosing_Package_Body
(Inst_Node
);
7455 Ensure_Freeze_Node
(Pack_Id
);
7456 F_Node
:= Freeze_Node
(Pack_Id
);
7458 if Is_Generic_Instance
(Par
)
7459 and then Present
(Freeze_Node
(Par
))
7460 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
7462 -- The parent was a premature instantiation. Insert freeze node at
7463 -- the end the current declarative part.
7465 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
7466 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7468 -- Handle the following case:
7470 -- package Parent_Inst is new ...
7473 -- procedure P ... -- this body freezes Parent_Inst
7475 -- package Inst is new ...
7477 -- In this particular scenario, the freeze node for Inst must be
7478 -- inserted in the same manner as that of Parent_Inst - before the
7479 -- next source body or at the end of the declarative list (body not
7480 -- available). If body P did not exist and Parent_Inst was frozen
7481 -- after Inst, either by a body following Inst or at the end of the
7482 -- declarative region, the freeze node for Inst must be inserted
7483 -- after that of Parent_Inst. This relation is established by
7484 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7486 elsif List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
7487 List_Containing
(Inst_Node
)
7488 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Inst_Node
)
7490 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7493 Insert_After
(Freeze_Node
(Par
), F_Node
);
7496 -- The body enclosing the instance should be frozen after the body that
7497 -- includes the generic, because the body of the instance may make
7498 -- references to entities therein. If the two are not in the same
7499 -- declarative part, or if the one enclosing the instance is frozen
7500 -- already, freeze the instance at the end of the current declarative
7503 elsif Is_Generic_Instance
(Par
)
7504 and then Present
(Freeze_Node
(Par
))
7505 and then Present
(Enc_I
)
7507 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
7509 (Nkind
(Enc_I
) = N_Package_Body
7511 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
7513 -- The enclosing package may contain several instances. Rather
7514 -- than computing the earliest point at which to insert its freeze
7515 -- node, we place it at the end of the declarative part of the
7516 -- parent of the generic.
7518 Insert_Freeze_Node_For_Instance
7519 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
7522 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7524 elsif Present
(Enc_G
)
7525 and then Present
(Enc_I
)
7526 and then Enc_G
/= Enc_I
7527 and then Earlier
(Inst_Node
, Gen_Body
)
7529 if Nkind
(Enc_G
) = N_Package_Body
then
7530 E_G_Id
:= Corresponding_Spec
(Enc_G
);
7531 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
7533 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
7536 -- Freeze package that encloses instance, and place node after the
7537 -- package that encloses generic. If enclosing package is already
7538 -- frozen we have to assume it is at the proper place. This may be a
7539 -- potential ABE that requires dynamic checking. Do not add a freeze
7540 -- node if the package that encloses the generic is inside the body
7541 -- that encloses the instance, because the freeze node would be in
7542 -- the wrong scope. Additional contortions needed if the bodies are
7543 -- within a subunit.
7546 Enclosing_Body
: Node_Id
;
7549 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
7550 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
7552 Enclosing_Body
:= Enc_I
;
7555 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
7556 Insert_Freeze_Node_For_Instance
7557 (Enc_G
, Package_Freeze_Node
(Enc_I
));
7561 -- Freeze enclosing subunit before instance
7563 Ensure_Freeze_Node
(E_G_Id
);
7565 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
7566 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
7569 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7572 -- If none of the above, insert freeze node at the end of the current
7573 -- declarative part.
7575 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7577 end Freeze_Subprogram_Body
;
7583 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
7585 return Generic_Renamings
.Table
(E
).Gen_Id
;
7588 ---------------------
7589 -- Get_Instance_Of --
7590 ---------------------
7592 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
7593 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
7596 if Res
/= Assoc_Null
then
7597 return Generic_Renamings
.Table
(Res
).Act_Id
;
7599 -- On exit, entity is not instantiated: not a generic parameter, or
7600 -- else parameter of an inner generic unit.
7604 end Get_Instance_Of
;
7606 ------------------------------------
7607 -- Get_Package_Instantiation_Node --
7608 ------------------------------------
7610 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
7611 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
7615 -- If the Package_Instantiation attribute has been set on the package
7616 -- entity, then use it directly when it (or its Original_Node) refers
7617 -- to an N_Package_Instantiation node. In principle it should be
7618 -- possible to have this field set in all cases, which should be
7619 -- investigated, and would allow this function to be significantly
7622 Inst
:= Package_Instantiation
(A
);
7624 if Present
(Inst
) then
7625 if Nkind
(Inst
) = N_Package_Instantiation
then
7628 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
7629 return Original_Node
(Inst
);
7633 -- If the instantiation is a compilation unit that does not need body
7634 -- then the instantiation node has been rewritten as a package
7635 -- declaration for the instance, and we return the original node.
7637 -- If it is a compilation unit and the instance node has not been
7638 -- rewritten, then it is still the unit of the compilation. Finally, if
7639 -- a body is present, this is a parent of the main unit whose body has
7640 -- been compiled for inlining purposes, and the instantiation node has
7641 -- been rewritten with the instance body.
7643 -- Otherwise the instantiation node appears after the declaration. If
7644 -- the entity is a formal package, the declaration may have been
7645 -- rewritten as a generic declaration (in the case of a formal with box)
7646 -- or left as a formal package declaration if it has actuals, and is
7647 -- found with a forward search.
7649 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
7650 if Nkind
(Decl
) = N_Package_Declaration
7651 and then Present
(Corresponding_Body
(Decl
))
7653 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
7656 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
7657 return Original_Node
(Decl
);
7659 return Unit
(Parent
(Decl
));
7662 elsif Nkind
(Decl
) = N_Package_Declaration
7663 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
7665 return Original_Node
(Decl
);
7668 Inst
:= Next
(Decl
);
7669 while not Nkind_In
(Inst
, N_Package_Instantiation
,
7670 N_Formal_Package_Declaration
)
7677 end Get_Package_Instantiation_Node
;
7679 ------------------------
7680 -- Has_Been_Exchanged --
7681 ------------------------
7683 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
7687 Next
:= First_Elmt
(Exchanged_Views
);
7688 while Present
(Next
) loop
7689 if Full_View
(Node
(Next
)) = E
then
7697 end Has_Been_Exchanged
;
7703 function Hash
(F
: Entity_Id
) return HTable_Range
is
7705 return HTable_Range
(F
mod HTable_Size
);
7708 ------------------------
7709 -- Hide_Current_Scope --
7710 ------------------------
7712 procedure Hide_Current_Scope
is
7713 C
: constant Entity_Id
:= Current_Scope
;
7717 Set_Is_Hidden_Open_Scope
(C
);
7719 E
:= First_Entity
(C
);
7720 while Present
(E
) loop
7721 if Is_Immediately_Visible
(E
) then
7722 Set_Is_Immediately_Visible
(E
, False);
7723 Append_Elmt
(E
, Hidden_Entities
);
7729 -- Make the scope name invisible as well. This is necessary, but might
7730 -- conflict with calls to Rtsfind later on, in case the scope is a
7731 -- predefined one. There is no clean solution to this problem, so for
7732 -- now we depend on the user not redefining Standard itself in one of
7733 -- the parent units.
7735 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
7736 Set_Is_Immediately_Visible
(C
, False);
7737 Append_Elmt
(C
, Hidden_Entities
);
7740 end Hide_Current_Scope
;
7746 procedure Init_Env
is
7747 Saved
: Instance_Env
;
7750 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
7751 Saved
.Exchanged_Views
:= Exchanged_Views
;
7752 Saved
.Hidden_Entities
:= Hidden_Entities
;
7753 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
7754 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
7755 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
7757 -- Save configuration switches. These may be reset if the unit is a
7758 -- predefined unit, and the current mode is not Ada 2005.
7760 Save_Opt_Config_Switches
(Saved
.Switches
);
7762 Instance_Envs
.Append
(Saved
);
7764 Exchanged_Views
:= New_Elmt_List
;
7765 Hidden_Entities
:= New_Elmt_List
;
7767 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7768 -- this is set properly in Set_Instance_Env.
7770 Current_Instantiated_Parent
:=
7771 (Current_Scope
, Current_Scope
, Assoc_Null
);
7774 ------------------------------
7775 -- In_Same_Declarative_Part --
7776 ------------------------------
7778 function In_Same_Declarative_Part
7780 Inst
: Node_Id
) return Boolean
7782 Decls
: constant Node_Id
:= Parent
(F_Node
);
7783 Nod
: Node_Id
:= Parent
(Inst
);
7786 while Present
(Nod
) loop
7790 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
7792 N_Package_Declaration
,
7799 elsif Nkind
(Nod
) = N_Subunit
then
7800 Nod
:= Corresponding_Stub
(Nod
);
7802 elsif Nkind
(Nod
) = N_Compilation_Unit
then
7806 Nod
:= Parent
(Nod
);
7811 end In_Same_Declarative_Part
;
7813 ---------------------
7814 -- In_Main_Context --
7815 ---------------------
7817 function In_Main_Context
(E
: Entity_Id
) return Boolean is
7823 if not Is_Compilation_Unit
(E
)
7824 or else Ekind
(E
) /= E_Package
7825 or else In_Private_Part
(E
)
7830 Context
:= Context_Items
(Cunit
(Main_Unit
));
7832 Clause
:= First
(Context
);
7833 while Present
(Clause
) loop
7834 if Nkind
(Clause
) = N_With_Clause
then
7835 Nam
:= Name
(Clause
);
7837 -- If the current scope is part of the context of the main unit,
7838 -- analysis of the corresponding with_clause is not complete, and
7839 -- the entity is not set. We use the Chars field directly, which
7840 -- might produce false positives in rare cases, but guarantees
7841 -- that we produce all the instance bodies we will need.
7843 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
7844 or else (Nkind
(Nam
) = N_Selected_Component
7845 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
7855 end In_Main_Context
;
7857 ---------------------
7858 -- Inherit_Context --
7859 ---------------------
7861 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
7862 Current_Context
: List_Id
;
7863 Current_Unit
: Node_Id
;
7872 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
7874 -- The inherited context is attached to the enclosing compilation
7875 -- unit. This is either the main unit, or the declaration for the
7876 -- main unit (in case the instantiation appears within the package
7877 -- declaration and the main unit is its body).
7879 Current_Unit
:= Parent
(Inst
);
7880 while Present
(Current_Unit
)
7881 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
7883 Current_Unit
:= Parent
(Current_Unit
);
7886 Current_Context
:= Context_Items
(Current_Unit
);
7888 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
7889 while Present
(Item
) loop
7890 if Nkind
(Item
) = N_With_Clause
then
7891 Lib_Unit
:= Library_Unit
(Item
);
7893 -- Take care to prevent direct cyclic with's
7895 if Lib_Unit
/= Current_Unit
then
7897 -- Do not add a unit if it is already in the context
7899 Clause
:= First
(Current_Context
);
7901 while Present
(Clause
) loop
7902 if Nkind
(Clause
) = N_With_Clause
and then
7903 Library_Unit
(Clause
) = Lib_Unit
7913 New_I
:= New_Copy
(Item
);
7914 Set_Implicit_With
(New_I
, True);
7915 Set_Implicit_With_From_Instantiation
(New_I
, True);
7916 Append
(New_I
, Current_Context
);
7924 end Inherit_Context
;
7930 procedure Initialize
is
7932 Generic_Renamings
.Init
;
7935 Generic_Renamings_HTable
.Reset
;
7936 Circularity_Detected
:= False;
7937 Exchanged_Views
:= No_Elist
;
7938 Hidden_Entities
:= No_Elist
;
7941 -------------------------------------
7942 -- Insert_Freeze_Node_For_Instance --
7943 -------------------------------------
7945 procedure Insert_Freeze_Node_For_Instance
7954 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
7955 -- Find enclosing package or subprogram body, if any. Freeze node may
7956 -- be placed at end of current declarative list if previous instance
7957 -- and current one have different enclosing bodies.
7959 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
7960 -- Find the local instance, if any, that declares the generic that is
7961 -- being instantiated. If present, the freeze node for this instance
7962 -- must follow the freeze node for the previous instance.
7964 --------------------
7965 -- Enclosing_Body --
7966 --------------------
7968 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
7974 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
7976 if Nkind_In
(P
, N_Package_Body
, N_Subprogram_Body
) then
7977 if Nkind
(Parent
(P
)) = N_Subunit
then
7978 return Corresponding_Stub
(Parent
(P
));
7984 P
:= True_Parent
(P
);
7990 -----------------------
7991 -- Previous_Instance --
7992 -----------------------
7994 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
8000 and then S
/= Standard_Standard
8002 if Is_Generic_Instance
(S
)
8003 and then In_Same_Source_Unit
(S
, N
)
8012 end Previous_Instance
;
8014 -- Start of processing for Insert_Freeze_Node_For_Instance
8017 if not Is_List_Member
(F_Node
) then
8019 Decls
:= List_Containing
(N
);
8020 Inst
:= Entity
(F_Node
);
8021 Par_N
:= Parent
(Decls
);
8023 -- When processing a subprogram instantiation, utilize the actual
8024 -- subprogram instantiation rather than its package wrapper as it
8025 -- carries all the context information.
8027 if Is_Wrapper_Package
(Inst
) then
8028 Inst
:= Related_Instance
(Inst
);
8031 -- If this is a package instance, check whether the generic is
8032 -- declared in a previous instance and the current instance is
8033 -- not within the previous one.
8035 if Present
(Generic_Parent
(Parent
(Inst
)))
8036 and then Is_In_Main_Unit
(N
)
8039 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
8040 Par_I
: constant Entity_Id
:=
8042 (Generic_Parent
(Parent
(Inst
)));
8047 and then Earlier
(N
, Freeze_Node
(Par_I
))
8049 Scop
:= Scope
(Inst
);
8051 -- If the current instance is within the one that contains
8052 -- the generic, the freeze node for the current one must
8053 -- appear in the current declarative part. Ditto, if the
8054 -- current instance is within another package instance or
8055 -- within a body that does not enclose the current instance.
8056 -- In these three cases the freeze node of the previous
8057 -- instance is not relevant.
8059 while Present
(Scop
)
8060 and then Scop
/= Standard_Standard
8062 exit when Scop
= Par_I
8064 (Is_Generic_Instance
(Scop
)
8065 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
8066 Scop
:= Scope
(Scop
);
8069 -- Previous instance encloses current instance
8071 if Scop
= Par_I
then
8074 -- If the next node is a source body we must freeze in
8075 -- the current scope as well.
8077 elsif Present
(Next
(N
))
8078 and then Nkind_In
(Next
(N
),
8079 N_Subprogram_Body
, N_Package_Body
)
8080 and then Comes_From_Source
(Next
(N
))
8084 -- Current instance is within an unrelated instance
8086 elsif Is_Generic_Instance
(Scop
) then
8089 -- Current instance is within an unrelated body
8091 elsif Present
(Enclosing_N
)
8092 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
8097 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
8104 -- When the instantiation occurs in a package declaration, append the
8105 -- freeze node to the private declarations (if any).
8107 if Nkind
(Par_N
) = N_Package_Specification
8108 and then Decls
= Visible_Declarations
(Par_N
)
8109 and then Present
(Private_Declarations
(Par_N
))
8110 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
8112 Decls
:= Private_Declarations
(Par_N
);
8113 Decl
:= First
(Decls
);
8116 -- Determine the proper freeze point of a package instantiation. We
8117 -- adhere to the general rule of a package or subprogram body causing
8118 -- freezing of anything before it in the same declarative region. In
8119 -- this case, the proper freeze point of a package instantiation is
8120 -- before the first source body which follows, or before a stub. This
8121 -- ensures that entities coming from the instance are already frozen
8122 -- and usable in source bodies.
8124 if Nkind
(Par_N
) /= N_Package_Declaration
8125 and then Ekind
(Inst
) = E_Package
8126 and then Is_Generic_Instance
(Inst
)
8128 not In_Same_Source_Unit
(Generic_Parent
(Parent
(Inst
)), Inst
)
8130 while Present
(Decl
) loop
8131 if (Nkind
(Decl
) in N_Unit_Body
8133 Nkind
(Decl
) in N_Body_Stub
)
8134 and then Comes_From_Source
(Decl
)
8136 Insert_Before
(Decl
, F_Node
);
8144 -- In a package declaration, or if no previous body, insert at end
8147 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
8148 Insert_After
(Last
(Decls
), F_Node
);
8150 end Insert_Freeze_Node_For_Instance
;
8156 procedure Install_Body
8157 (Act_Body
: Node_Id
;
8162 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
8163 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
8164 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
8165 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
8166 Gen_Unit
: constant Node_Id
:=
8167 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
8168 Orig_Body
: Node_Id
:= Gen_Body
;
8170 Body_Unit
: Node_Id
;
8172 Must_Delay
: Boolean;
8174 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
8175 -- Find subprogram (if any) that encloses instance and/or generic body
8177 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
8178 -- If the instance is nested inside a generic unit, the Sloc of the
8179 -- instance indicates the place of the original definition, not the
8180 -- point of the current enclosing instance. Pending a better usage of
8181 -- Slocs to indicate instantiation places, we determine the place of
8182 -- origin of a node by finding the maximum sloc of any ancestor node.
8183 -- Why is this not equivalent to Top_Level_Location ???
8185 --------------------
8186 -- Enclosing_Subp --
8187 --------------------
8189 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
8194 while Scop
/= Standard_Standard
8195 and then not Is_Overloadable
(Scop
)
8197 Scop
:= Scope
(Scop
);
8207 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
8214 while Present
(N1
) and then N1
/= Act_Unit
loop
8215 if Sloc
(N1
) > Res
then
8225 -- Start of processing for Install_Body
8228 -- If the body is a subunit, the freeze point is the corresponding stub
8229 -- in the current compilation, not the subunit itself.
8231 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
8232 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
8234 Orig_Body
:= Gen_Body
;
8237 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
8239 -- If the instantiation and the generic definition appear in the same
8240 -- package declaration, this is an early instantiation. If they appear
8241 -- in the same declarative part, it is an early instantiation only if
8242 -- the generic body appears textually later, and the generic body is
8243 -- also in the main unit.
8245 -- If instance is nested within a subprogram, and the generic body is
8246 -- not, the instance is delayed because the enclosing body is. If
8247 -- instance and body are within the same scope, or the same sub-
8248 -- program body, indicate explicitly that the instance is delayed.
8251 (Gen_Unit
= Act_Unit
8252 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
8253 N_Generic_Package_Declaration
)
8254 or else (Gen_Unit
= Body_Unit
8255 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
8256 and then Is_In_Main_Unit
(Gen_Unit
)
8257 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
8259 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
8261 -- If this is an early instantiation, the freeze node is placed after
8262 -- the generic body. Otherwise, if the generic appears in an instance,
8263 -- we cannot freeze the current instance until the outer one is frozen.
8264 -- This is only relevant if the current instance is nested within some
8265 -- inner scope not itself within the outer instance. If this scope is
8266 -- a package body in the same declarative part as the outer instance,
8267 -- then that body needs to be frozen after the outer instance. Finally,
8268 -- if no delay is needed, we place the freeze node at the end of the
8269 -- current declarative part.
8271 if Expander_Active
then
8272 Ensure_Freeze_Node
(Act_Id
);
8273 F_Node
:= Freeze_Node
(Act_Id
);
8276 Insert_After
(Orig_Body
, F_Node
);
8278 elsif Is_Generic_Instance
(Par
)
8279 and then Present
(Freeze_Node
(Par
))
8280 and then Scope
(Act_Id
) /= Par
8282 -- Freeze instance of inner generic after instance of enclosing
8285 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
8287 -- Handle the following case:
8289 -- package Parent_Inst is new ...
8292 -- procedure P ... -- this body freezes Parent_Inst
8294 -- package Inst is new ...
8296 -- In this particular scenario, the freeze node for Inst must
8297 -- be inserted in the same manner as that of Parent_Inst -
8298 -- before the next source body or at the end of the declarative
8299 -- list (body not available). If body P did not exist and
8300 -- Parent_Inst was frozen after Inst, either by a body
8301 -- following Inst or at the end of the declarative region, the
8302 -- freeze node for Inst must be inserted after that of
8303 -- Parent_Inst. This relation is established by comparing the
8304 -- Slocs of Parent_Inst freeze node and Inst.
8306 if List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
8308 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(N
)
8310 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8312 Insert_After
(Freeze_Node
(Par
), F_Node
);
8315 -- Freeze package enclosing instance of inner generic after
8316 -- instance of enclosing generic.
8318 elsif Nkind_In
(Parent
(N
), N_Package_Body
, N_Subprogram_Body
)
8319 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
8322 Enclosing
: Entity_Id
;
8325 Enclosing
:= Corresponding_Spec
(Parent
(N
));
8327 if No
(Enclosing
) then
8328 Enclosing
:= Defining_Entity
(Parent
(N
));
8331 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8332 Ensure_Freeze_Node
(Enclosing
);
8334 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
8336 -- The enclosing context is a subunit, insert the freeze
8337 -- node after the stub.
8339 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
8340 Insert_Freeze_Node_For_Instance
8341 (Corresponding_Stub
(Parent
(Parent
(N
))),
8342 Freeze_Node
(Enclosing
));
8344 -- The enclosing context is a package with a stub body
8345 -- which has already been replaced by the real body.
8346 -- Insert the freeze node after the actual body.
8348 elsif Ekind
(Enclosing
) = E_Package
8349 and then Present
(Body_Entity
(Enclosing
))
8350 and then Was_Originally_Stub
8351 (Parent
(Body_Entity
(Enclosing
)))
8353 Insert_Freeze_Node_For_Instance
8354 (Parent
(Body_Entity
(Enclosing
)),
8355 Freeze_Node
(Enclosing
));
8357 -- The parent instance has been frozen before the body of
8358 -- the enclosing package, insert the freeze node after
8361 elsif List_Containing
(Freeze_Node
(Par
)) =
8362 List_Containing
(Parent
(N
))
8363 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Parent
(N
))
8365 Insert_Freeze_Node_For_Instance
8366 (Parent
(N
), Freeze_Node
(Enclosing
));
8370 (Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
8376 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8380 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8384 Set_Is_Frozen
(Act_Id
);
8385 Insert_Before
(N
, Act_Body
);
8386 Mark_Rewrite_Insertion
(Act_Body
);
8389 -----------------------------
8390 -- Install_Formal_Packages --
8391 -----------------------------
8393 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
8396 Gen_E
: Entity_Id
:= Empty
;
8399 E
:= First_Entity
(Par
);
8401 -- If we are installing an instance parent, locate the formal packages
8402 -- of its generic parent.
8404 if Is_Generic_Instance
(Par
) then
8405 Gen
:= Generic_Parent
(Package_Specification
(Par
));
8406 Gen_E
:= First_Entity
(Gen
);
8409 while Present
(E
) loop
8410 if Ekind
(E
) = E_Package
8411 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
8413 -- If this is the renaming for the parent instance, done
8415 if Renamed_Object
(E
) = Par
then
8418 -- The visibility of a formal of an enclosing generic is already
8421 elsif Denotes_Formal_Package
(E
) then
8424 elsif Present
(Associated_Formal_Package
(E
)) then
8425 Check_Generic_Actuals
(Renamed_Object
(E
), True);
8426 Set_Is_Hidden
(E
, False);
8428 -- Find formal package in generic unit that corresponds to
8429 -- (instance of) formal package in instance.
8431 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
8432 Next_Entity
(Gen_E
);
8435 if Present
(Gen_E
) then
8436 Map_Formal_Package_Entities
(Gen_E
, E
);
8442 if Present
(Gen_E
) then
8443 Next_Entity
(Gen_E
);
8446 end Install_Formal_Packages
;
8448 --------------------
8449 -- Install_Parent --
8450 --------------------
8452 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
8453 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
8454 S
: constant Entity_Id
:= Current_Scope
;
8455 Inst_Par
: Entity_Id
;
8456 First_Par
: Entity_Id
;
8457 Inst_Node
: Node_Id
;
8458 Gen_Par
: Entity_Id
;
8459 First_Gen
: Entity_Id
;
8462 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
8463 -- Install the scopes of noninstance parent units ending with Par
8465 procedure Install_Spec
(Par
: Entity_Id
);
8466 -- The child unit is within the declarative part of the parent, so the
8467 -- declarations within the parent are immediately visible.
8469 -------------------------------
8470 -- Install_Noninstance_Specs --
8471 -------------------------------
8473 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
8476 and then Par
/= Standard_Standard
8477 and then not In_Open_Scopes
(Par
)
8479 Install_Noninstance_Specs
(Scope
(Par
));
8482 end Install_Noninstance_Specs
;
8488 procedure Install_Spec
(Par
: Entity_Id
) is
8489 Spec
: constant Node_Id
:= Package_Specification
(Par
);
8492 -- If this parent of the child instance is a top-level unit,
8493 -- then record the unit and its visibility for later resetting in
8494 -- Remove_Parent. We exclude units that are generic instances, as we
8495 -- only want to record this information for the ultimate top-level
8496 -- noninstance parent (is that always correct???).
8498 if Scope
(Par
) = Standard_Standard
8499 and then not Is_Generic_Instance
(Par
)
8501 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
8502 Instance_Parent_Unit
:= Par
;
8505 -- Open the parent scope and make it and its declarations visible.
8506 -- If this point is not within a body, then only the visible
8507 -- declarations should be made visible, and installation of the
8508 -- private declarations is deferred until the appropriate point
8509 -- within analysis of the spec being instantiated (see the handling
8510 -- of parent visibility in Analyze_Package_Specification). This is
8511 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8512 -- private view problems that occur when compiling instantiations of
8513 -- a generic child of that package (Generic_Dispatching_Constructor).
8514 -- If the instance freezes a tagged type, inlinings of operations
8515 -- from Ada.Tags may need the full view of type Tag. If inlining took
8516 -- proper account of establishing visibility of inlined subprograms'
8517 -- parents then it should be possible to remove this
8518 -- special check. ???
8521 Set_Is_Immediately_Visible
(Par
);
8522 Install_Visible_Declarations
(Par
);
8523 Set_Use
(Visible_Declarations
(Spec
));
8525 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
8526 Install_Private_Declarations
(Par
);
8527 Set_Use
(Private_Declarations
(Spec
));
8531 -- Start of processing for Install_Parent
8534 -- We need to install the parent instance to compile the instantiation
8535 -- of the child, but the child instance must appear in the current
8536 -- scope. Given that we cannot place the parent above the current scope
8537 -- in the scope stack, we duplicate the current scope and unstack both
8538 -- after the instantiation is complete.
8540 -- If the parent is itself the instantiation of a child unit, we must
8541 -- also stack the instantiation of its parent, and so on. Each such
8542 -- ancestor is the prefix of the name in a prior instantiation.
8544 -- If this is a nested instance, the parent unit itself resolves to
8545 -- a renaming of the parent instance, whose declaration we need.
8547 -- Finally, the parent may be a generic (not an instance) when the
8548 -- child unit appears as a formal package.
8552 if Present
(Renamed_Entity
(Inst_Par
)) then
8553 Inst_Par
:= Renamed_Entity
(Inst_Par
);
8556 First_Par
:= Inst_Par
;
8558 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
8560 First_Gen
:= Gen_Par
;
8562 while Present
(Gen_Par
)
8563 and then Is_Child_Unit
(Gen_Par
)
8565 -- Load grandparent instance as well
8567 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
8569 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
8570 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
8572 if Present
(Renamed_Entity
(Inst_Par
)) then
8573 Inst_Par
:= Renamed_Entity
(Inst_Par
);
8576 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
8578 if Present
(Gen_Par
) then
8579 Prepend_Elmt
(Inst_Par
, Ancestors
);
8582 -- Parent is not the name of an instantiation
8584 Install_Noninstance_Specs
(Inst_Par
);
8595 if Present
(First_Gen
) then
8596 Append_Elmt
(First_Par
, Ancestors
);
8598 Install_Noninstance_Specs
(First_Par
);
8601 if not Is_Empty_Elmt_List
(Ancestors
) then
8602 Elmt
:= First_Elmt
(Ancestors
);
8603 while Present
(Elmt
) loop
8604 Install_Spec
(Node
(Elmt
));
8605 Install_Formal_Packages
(Node
(Elmt
));
8615 -------------------------------
8616 -- Install_Hidden_Primitives --
8617 -------------------------------
8619 procedure Install_Hidden_Primitives
8620 (Prims_List
: in out Elist_Id
;
8625 List
: Elist_Id
:= No_Elist
;
8626 Prim_G_Elmt
: Elmt_Id
;
8627 Prim_A_Elmt
: Elmt_Id
;
8632 -- No action needed in case of serious errors because we cannot trust
8633 -- in the order of primitives
8635 if Serious_Errors_Detected
> 0 then
8638 -- No action possible if we don't have available the list of primitive
8642 or else not Is_Record_Type
(Gen_T
)
8643 or else not Is_Tagged_Type
(Gen_T
)
8644 or else not Is_Record_Type
(Act_T
)
8645 or else not Is_Tagged_Type
(Act_T
)
8649 -- There is no need to handle interface types since their primitives
8652 elsif Is_Interface
(Gen_T
) then
8656 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
8658 if not Is_Class_Wide_Type
(Act_T
) then
8659 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
8661 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
8665 -- Skip predefined primitives in the generic formal
8667 while Present
(Prim_G_Elmt
)
8668 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
8670 Next_Elmt
(Prim_G_Elmt
);
8673 -- Skip predefined primitives in the generic actual
8675 while Present
(Prim_A_Elmt
)
8676 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
8678 Next_Elmt
(Prim_A_Elmt
);
8681 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
8683 Prim_G
:= Node
(Prim_G_Elmt
);
8684 Prim_A
:= Node
(Prim_A_Elmt
);
8686 -- There is no need to handle interface primitives because their
8687 -- primitives are not hidden
8689 exit when Present
(Interface_Alias
(Prim_G
));
8691 -- Here we install one hidden primitive
8693 if Chars
(Prim_G
) /= Chars
(Prim_A
)
8694 and then Has_Suffix
(Prim_A
, 'P')
8695 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
8697 Set_Chars
(Prim_A
, Chars
(Prim_G
));
8699 if List
= No_Elist
then
8700 List
:= New_Elmt_List
;
8703 Append_Elmt
(Prim_A
, List
);
8706 Next_Elmt
(Prim_A_Elmt
);
8707 Next_Elmt
(Prim_G_Elmt
);
8710 -- Append the elements to the list of temporarily visible primitives
8711 -- avoiding duplicates.
8713 if Present
(List
) then
8714 if No
(Prims_List
) then
8715 Prims_List
:= New_Elmt_List
;
8718 Elmt
:= First_Elmt
(List
);
8719 while Present
(Elmt
) loop
8720 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
8724 end Install_Hidden_Primitives
;
8726 -------------------------------
8727 -- Restore_Hidden_Primitives --
8728 -------------------------------
8730 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
8731 Prim_Elmt
: Elmt_Id
;
8735 if Prims_List
/= No_Elist
then
8736 Prim_Elmt
:= First_Elmt
(Prims_List
);
8737 while Present
(Prim_Elmt
) loop
8738 Prim
:= Node
(Prim_Elmt
);
8739 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
8740 Next_Elmt
(Prim_Elmt
);
8743 Prims_List
:= No_Elist
;
8745 end Restore_Hidden_Primitives
;
8747 --------------------------------
8748 -- Instantiate_Formal_Package --
8749 --------------------------------
8751 function Instantiate_Formal_Package
8754 Analyzed_Formal
: Node_Id
) return List_Id
8756 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
8757 Actual_Pack
: Entity_Id
;
8758 Formal_Pack
: Entity_Id
;
8759 Gen_Parent
: Entity_Id
;
8762 Parent_Spec
: Node_Id
;
8764 procedure Find_Matching_Actual
8766 Act
: in out Entity_Id
);
8767 -- We need to associate each formal entity in the formal package with
8768 -- the corresponding entity in the actual package. The actual package
8769 -- has been analyzed and possibly expanded, and as a result there is
8770 -- no one-to-one correspondence between the two lists (for example,
8771 -- the actual may include subtypes, itypes, and inherited primitive
8772 -- operations, interspersed among the renaming declarations for the
8773 -- actuals) . We retrieve the corresponding actual by name because each
8774 -- actual has the same name as the formal, and they do appear in the
8777 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
8778 -- Retrieve entity of defining entity of generic formal parameter.
8779 -- Only the declarations of formals need to be considered when
8780 -- linking them to actuals, but the declarative list may include
8781 -- internal entities generated during analysis, and those are ignored.
8783 procedure Match_Formal_Entity
8784 (Formal_Node
: Node_Id
;
8785 Formal_Ent
: Entity_Id
;
8786 Actual_Ent
: Entity_Id
);
8787 -- Associates the formal entity with the actual. In the case where
8788 -- Formal_Ent is a formal package, this procedure iterates through all
8789 -- of its formals and enters associations between the actuals occurring
8790 -- in the formal package's corresponding actual package (given by
8791 -- Actual_Ent) and the formal package's formal parameters. This
8792 -- procedure recurses if any of the parameters is itself a package.
8794 function Is_Instance_Of
8795 (Act_Spec
: Entity_Id
;
8796 Gen_Anc
: Entity_Id
) return Boolean;
8797 -- The actual can be an instantiation of a generic within another
8798 -- instance, in which case there is no direct link from it to the
8799 -- original generic ancestor. In that case, we recognize that the
8800 -- ultimate ancestor is the same by examining names and scopes.
8802 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
8803 -- If the current formal is declared with a box, its own formals are
8804 -- visible in the instance, as they were in the generic, and their
8805 -- Hidden flag must be reset. If some of these formals are themselves
8806 -- packages declared with a box, the processing must be recursive.
8808 --------------------------
8809 -- Find_Matching_Actual --
8810 --------------------------
8812 procedure Find_Matching_Actual
8814 Act
: in out Entity_Id
)
8816 Formal_Ent
: Entity_Id
;
8819 case Nkind
(Original_Node
(F
)) is
8820 when N_Formal_Object_Declaration |
8821 N_Formal_Type_Declaration
=>
8822 Formal_Ent
:= Defining_Identifier
(F
);
8824 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
8828 when N_Formal_Subprogram_Declaration |
8829 N_Formal_Package_Declaration |
8830 N_Package_Declaration |
8831 N_Generic_Package_Declaration
=>
8832 Formal_Ent
:= Defining_Entity
(F
);
8834 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
8839 raise Program_Error
;
8841 end Find_Matching_Actual
;
8843 -------------------------
8844 -- Match_Formal_Entity --
8845 -------------------------
8847 procedure Match_Formal_Entity
8848 (Formal_Node
: Node_Id
;
8849 Formal_Ent
: Entity_Id
;
8850 Actual_Ent
: Entity_Id
)
8852 Act_Pkg
: Entity_Id
;
8855 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
8857 if Ekind
(Actual_Ent
) = E_Package
then
8859 -- Record associations for each parameter
8861 Act_Pkg
:= Actual_Ent
;
8864 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
8873 -- Retrieve the actual given in the formal package declaration
8875 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
8877 -- The actual in the formal package declaration may be a
8878 -- renamed generic package, in which case we want to retrieve
8879 -- the original generic in order to traverse its formal part.
8881 if Present
(Renamed_Entity
(Actual
)) then
8882 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
8884 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
8887 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
8889 if Present
(Formals
) then
8890 F_Node
:= First_Non_Pragma
(Formals
);
8895 while Present
(A_Ent
)
8896 and then Present
(F_Node
)
8897 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
8899 F_Ent
:= Get_Formal_Entity
(F_Node
);
8901 if Present
(F_Ent
) then
8903 -- This is a formal of the original package. Record
8904 -- association and recurse.
8906 Find_Matching_Actual
(F_Node
, A_Ent
);
8907 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
8908 Next_Entity
(A_Ent
);
8911 Next_Non_Pragma
(F_Node
);
8915 end Match_Formal_Entity
;
8917 -----------------------
8918 -- Get_Formal_Entity --
8919 -----------------------
8921 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
8922 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
8925 when N_Formal_Object_Declaration
=>
8926 return Defining_Identifier
(N
);
8928 when N_Formal_Type_Declaration
=>
8929 return Defining_Identifier
(N
);
8931 when N_Formal_Subprogram_Declaration
=>
8932 return Defining_Unit_Name
(Specification
(N
));
8934 when N_Formal_Package_Declaration
=>
8935 return Defining_Identifier
(Original_Node
(N
));
8937 when N_Generic_Package_Declaration
=>
8938 return Defining_Identifier
(Original_Node
(N
));
8940 -- All other declarations are introduced by semantic analysis and
8941 -- have no match in the actual.
8946 end Get_Formal_Entity
;
8948 --------------------
8949 -- Is_Instance_Of --
8950 --------------------
8952 function Is_Instance_Of
8953 (Act_Spec
: Entity_Id
;
8954 Gen_Anc
: Entity_Id
) return Boolean
8956 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
8959 if No
(Gen_Par
) then
8962 -- Simplest case: the generic parent of the actual is the formal
8964 elsif Gen_Par
= Gen_Anc
then
8967 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
8970 -- The actual may be obtained through several instantiations. Its
8971 -- scope must itself be an instance of a generic declared in the
8972 -- same scope as the formal. Any other case is detected above.
8974 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
8978 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
8982 ---------------------------
8983 -- Process_Nested_Formal --
8984 ---------------------------
8986 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
8990 if Present
(Associated_Formal_Package
(Formal
))
8991 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
8993 Ent
:= First_Entity
(Formal
);
8994 while Present
(Ent
) loop
8995 Set_Is_Hidden
(Ent
, False);
8996 Set_Is_Visible_Formal
(Ent
);
8997 Set_Is_Potentially_Use_Visible
8998 (Ent
, Is_Potentially_Use_Visible
(Formal
));
9000 if Ekind
(Ent
) = E_Package
then
9001 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
9002 Process_Nested_Formal
(Ent
);
9008 end Process_Nested_Formal
;
9010 -- Start of processing for Instantiate_Formal_Package
9015 if not Is_Entity_Name
(Actual
)
9016 or else Ekind
(Entity
(Actual
)) /= E_Package
9019 ("expect package instance to instantiate formal", Actual
);
9020 Abandon_Instantiation
(Actual
);
9021 raise Program_Error
;
9024 Actual_Pack
:= Entity
(Actual
);
9025 Set_Is_Instantiated
(Actual_Pack
);
9027 -- The actual may be a renamed package, or an outer generic formal
9028 -- package whose instantiation is converted into a renaming.
9030 if Present
(Renamed_Object
(Actual_Pack
)) then
9031 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
9034 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
9035 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
9036 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
9039 Generic_Parent
(Specification
(Analyzed_Formal
));
9041 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9044 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
9045 Parent_Spec
:= Package_Specification
(Actual_Pack
);
9047 Parent_Spec
:= Parent
(Actual_Pack
);
9050 if Gen_Parent
= Any_Id
then
9052 ("previous error in declaration of formal package", Actual
);
9053 Abandon_Instantiation
(Actual
);
9056 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
9062 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
9063 Abandon_Instantiation
(Actual
);
9066 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
9067 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
9070 Make_Package_Renaming_Declaration
(Loc
,
9071 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
9072 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
9074 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
9075 Defining_Identifier
(Formal
));
9076 Decls
:= New_List
(Nod
);
9078 -- If the formal F has a box, then the generic declarations are
9079 -- visible in the generic G. In an instance of G, the corresponding
9080 -- entities in the actual for F (which are the actuals for the
9081 -- instantiation of the generic that F denotes) must also be made
9082 -- visible for analysis of the current instance. On exit from the
9083 -- current instance, those entities are made private again. If the
9084 -- actual is currently in use, these entities are also use-visible.
9086 -- The loop through the actual entities also steps through the formal
9087 -- entities and enters associations from formals to actuals into the
9088 -- renaming map. This is necessary to properly handle checking of
9089 -- actual parameter associations for later formals that depend on
9090 -- actuals declared in the formal package.
9092 -- In Ada 2005, partial parameterization requires that we make
9093 -- visible the actuals corresponding to formals that were defaulted
9094 -- in the formal package. There formals are identified because they
9095 -- remain formal generics within the formal package, rather than
9096 -- being renamings of the actuals supplied.
9099 Gen_Decl
: constant Node_Id
:=
9100 Unit_Declaration_Node
(Gen_Parent
);
9101 Formals
: constant List_Id
:=
9102 Generic_Formal_Declarations
(Gen_Decl
);
9104 Actual_Ent
: Entity_Id
;
9105 Actual_Of_Formal
: Node_Id
;
9106 Formal_Node
: Node_Id
;
9107 Formal_Ent
: Entity_Id
;
9110 if Present
(Formals
) then
9111 Formal_Node
:= First_Non_Pragma
(Formals
);
9113 Formal_Node
:= Empty
;
9116 Actual_Ent
:= First_Entity
(Actual_Pack
);
9118 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
9119 while Present
(Actual_Ent
)
9120 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9122 if Present
(Formal_Node
) then
9123 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
9125 if Present
(Formal_Ent
) then
9126 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
9128 (Formal_Node
, Formal_Ent
, Actual_Ent
);
9130 -- We iterate at the same time over the actuals of the
9131 -- local package created for the formal, to determine
9132 -- which one of the formals of the original generic were
9133 -- defaulted in the formal. The corresponding actual
9134 -- entities are visible in the enclosing instance.
9136 if Box_Present
(Formal
)
9138 (Present
(Actual_Of_Formal
)
9141 (Get_Formal_Entity
(Actual_Of_Formal
)))
9143 Set_Is_Hidden
(Actual_Ent
, False);
9144 Set_Is_Visible_Formal
(Actual_Ent
);
9145 Set_Is_Potentially_Use_Visible
9146 (Actual_Ent
, In_Use
(Actual_Pack
));
9148 if Ekind
(Actual_Ent
) = E_Package
then
9149 Process_Nested_Formal
(Actual_Ent
);
9153 Set_Is_Hidden
(Actual_Ent
);
9154 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
9158 Next_Non_Pragma
(Formal_Node
);
9159 Next
(Actual_Of_Formal
);
9162 -- No further formals to match, but the generic part may
9163 -- contain inherited operation that are not hidden in the
9164 -- enclosing instance.
9166 Next_Entity
(Actual_Ent
);
9170 -- Inherited subprograms generated by formal derived types are
9171 -- also visible if the types are.
9173 Actual_Ent
:= First_Entity
(Actual_Pack
);
9174 while Present
(Actual_Ent
)
9175 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9177 if Is_Overloadable
(Actual_Ent
)
9179 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
9181 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
9183 Set_Is_Hidden
(Actual_Ent
, False);
9184 Set_Is_Potentially_Use_Visible
9185 (Actual_Ent
, In_Use
(Actual_Pack
));
9188 Next_Entity
(Actual_Ent
);
9192 -- If the formal is not declared with a box, reanalyze it as an
9193 -- abbreviated instantiation, to verify the matching rules of 12.7.
9194 -- The actual checks are performed after the generic associations
9195 -- have been analyzed, to guarantee the same visibility for this
9196 -- instantiation and for the actuals.
9198 -- In Ada 2005, the generic associations for the formal can include
9199 -- defaulted parameters. These are ignored during check. This
9200 -- internal instantiation is removed from the tree after conformance
9201 -- checking, because it contains formal declarations for those
9202 -- defaulted parameters, and those should not reach the back-end.
9204 if not Box_Present
(Formal
) then
9206 I_Pack
: constant Entity_Id
:=
9207 Make_Temporary
(Sloc
(Actual
), 'P');
9210 Set_Is_Internal
(I_Pack
);
9213 Make_Package_Instantiation
(Sloc
(Actual
),
9214 Defining_Unit_Name
=> I_Pack
,
9217 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
9218 Generic_Associations
=>
9219 Generic_Associations
(Formal
)));
9225 end Instantiate_Formal_Package
;
9227 -----------------------------------
9228 -- Instantiate_Formal_Subprogram --
9229 -----------------------------------
9231 function Instantiate_Formal_Subprogram
9234 Analyzed_Formal
: Node_Id
) return Node_Id
9237 Formal_Sub
: constant Entity_Id
:=
9238 Defining_Unit_Name
(Specification
(Formal
));
9239 Analyzed_S
: constant Entity_Id
:=
9240 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9241 Decl_Node
: Node_Id
;
9245 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
9246 -- If the generic is a child unit, the parent has been installed on the
9247 -- scope stack, but a default subprogram cannot resolve to something
9248 -- on the parent because that parent is not really part of the visible
9249 -- context (it is there to resolve explicit local entities). If the
9250 -- default has resolved in this way, we remove the entity from immediate
9251 -- visibility and analyze the node again to emit an error message or
9252 -- find another visible candidate.
9254 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
9255 -- Perform legality check and raise exception on failure
9257 -----------------------
9258 -- From_Parent_Scope --
9259 -----------------------
9261 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
9262 Gen_Scope
: Node_Id
;
9265 Gen_Scope
:= Scope
(Analyzed_S
);
9266 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
9267 if Scope
(Subp
) = Scope
(Gen_Scope
) then
9271 Gen_Scope
:= Scope
(Gen_Scope
);
9275 end From_Parent_Scope
;
9277 -----------------------------
9278 -- Valid_Actual_Subprogram --
9279 -----------------------------
9281 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
9285 if Is_Entity_Name
(Act
) then
9286 Act_E
:= Entity
(Act
);
9288 elsif Nkind
(Act
) = N_Selected_Component
9289 and then Is_Entity_Name
(Selector_Name
(Act
))
9291 Act_E
:= Entity
(Selector_Name
(Act
));
9297 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
9298 or else Nkind_In
(Act
, N_Attribute_Reference
,
9299 N_Indexed_Component
,
9300 N_Character_Literal
,
9301 N_Explicit_Dereference
)
9307 ("expect subprogram or entry name in instantiation of&",
9308 Instantiation_Node
, Formal_Sub
);
9309 Abandon_Instantiation
(Instantiation_Node
);
9311 end Valid_Actual_Subprogram
;
9313 -- Start of processing for Instantiate_Formal_Subprogram
9316 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
9318 -- The tree copy has created the proper instantiation sloc for the
9319 -- new specification. Use this location for all other constructed
9322 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
9324 -- Create new entity for the actual (New_Copy_Tree does not)
9326 Set_Defining_Unit_Name
9327 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9329 -- Create new entities for the each of the formals in the
9330 -- specification of the renaming declaration built for the actual.
9332 if Present
(Parameter_Specifications
(New_Spec
)) then
9336 F
:= First
(Parameter_Specifications
(New_Spec
));
9337 while Present
(F
) loop
9338 Set_Defining_Identifier
(F
,
9339 Make_Defining_Identifier
(Sloc
(F
),
9340 Chars
=> Chars
(Defining_Identifier
(F
))));
9346 -- Find entity of actual. If the actual is an attribute reference, it
9347 -- cannot be resolved here (its formal is missing) but is handled
9348 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9349 -- fully resolved subsequently, when the renaming declaration for the
9350 -- formal is analyzed. If it is an explicit dereference, resolve the
9351 -- prefix but not the actual itself, to prevent interpretation as call.
9353 if Present
(Actual
) then
9354 Loc
:= Sloc
(Actual
);
9355 Set_Sloc
(New_Spec
, Loc
);
9357 if Nkind
(Actual
) = N_Operator_Symbol
then
9358 Find_Direct_Name
(Actual
);
9360 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
9361 Analyze
(Prefix
(Actual
));
9363 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
9367 Valid_Actual_Subprogram
(Actual
);
9370 elsif Present
(Default_Name
(Formal
)) then
9371 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
9372 N_Selected_Component
,
9373 N_Indexed_Component
,
9374 N_Character_Literal
)
9375 and then Present
(Entity
(Default_Name
(Formal
)))
9377 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
9379 Nam
:= New_Copy
(Default_Name
(Formal
));
9380 Set_Sloc
(Nam
, Loc
);
9383 elsif Box_Present
(Formal
) then
9385 -- Actual is resolved at the point of instantiation. Create an
9386 -- identifier or operator with the same name as the formal.
9388 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
9389 Nam
:= Make_Operator_Symbol
(Loc
,
9390 Chars
=> Chars
(Formal_Sub
),
9391 Strval
=> No_String
);
9393 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
9396 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
9397 and then Null_Present
(Specification
(Formal
))
9399 -- Generate null body for procedure, for use in the instance
9402 Make_Subprogram_Body
(Loc
,
9403 Specification
=> New_Spec
,
9404 Declarations
=> New_List
,
9405 Handled_Statement_Sequence
=>
9406 Make_Handled_Sequence_Of_Statements
(Loc
,
9407 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
9409 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
9413 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
9415 ("missing actual&", Instantiation_Node
, Formal_Sub
);
9417 ("\in instantiation of & declared#",
9418 Instantiation_Node
, Scope
(Analyzed_S
));
9419 Abandon_Instantiation
(Instantiation_Node
);
9423 Make_Subprogram_Renaming_Declaration
(Loc
,
9424 Specification
=> New_Spec
,
9427 -- If we do not have an actual and the formal specified <> then set to
9428 -- get proper default.
9430 if No
(Actual
) and then Box_Present
(Formal
) then
9431 Set_From_Default
(Decl_Node
);
9434 -- Gather possible interpretations for the actual before analyzing the
9435 -- instance. If overloaded, it will be resolved when analyzing the
9436 -- renaming declaration.
9438 if Box_Present
(Formal
)
9439 and then No
(Actual
)
9443 if Is_Child_Unit
(Scope
(Analyzed_S
))
9444 and then Present
(Entity
(Nam
))
9446 if not Is_Overloaded
(Nam
) then
9447 if From_Parent_Scope
(Entity
(Nam
)) then
9448 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
9449 Set_Entity
(Nam
, Empty
);
9450 Set_Etype
(Nam
, Empty
);
9453 Set_Is_Immediately_Visible
(Entity
(Nam
));
9462 Get_First_Interp
(Nam
, I
, It
);
9463 while Present
(It
.Nam
) loop
9464 if From_Parent_Scope
(It
.Nam
) then
9468 Get_Next_Interp
(I
, It
);
9475 -- The generic instantiation freezes the actual. This can only be done
9476 -- once the actual is resolved, in the analysis of the renaming
9477 -- declaration. To make the formal subprogram entity available, we set
9478 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9479 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9480 -- of formal abstract subprograms.
9482 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
9484 -- We cannot analyze the renaming declaration, and thus find the actual,
9485 -- until all the actuals are assembled in the instance. For subsequent
9486 -- checks of other actuals, indicate the node that will hold the
9487 -- instance of this formal.
9489 Set_Instance_Of
(Analyzed_S
, Nam
);
9491 if Nkind
(Actual
) = N_Selected_Component
9492 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
9493 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
9495 -- The renaming declaration will create a body, which must appear
9496 -- outside of the instantiation, We move the renaming declaration
9497 -- out of the instance, and create an additional renaming inside,
9498 -- to prevent freezing anomalies.
9501 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
9504 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
9505 Insert_Before
(Instantiation_Node
, Decl_Node
);
9506 Analyze
(Decl_Node
);
9508 -- Now create renaming within the instance
9511 Make_Subprogram_Renaming_Declaration
(Loc
,
9512 Specification
=> New_Copy_Tree
(New_Spec
),
9513 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
9515 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
9516 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9521 end Instantiate_Formal_Subprogram
;
9523 ------------------------
9524 -- Instantiate_Object --
9525 ------------------------
9527 function Instantiate_Object
9530 Analyzed_Formal
: Node_Id
) return List_Id
9532 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
9533 A_Gen_Obj
: constant Entity_Id
:=
9534 Defining_Identifier
(Analyzed_Formal
);
9535 Acc_Def
: Node_Id
:= Empty
;
9536 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
9537 Actual_Decl
: Node_Id
:= Empty
;
9538 Decl_Node
: Node_Id
;
9541 List
: constant List_Id
:= New_List
;
9542 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9543 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
9544 Subt_Decl
: Node_Id
:= Empty
;
9545 Subt_Mark
: Node_Id
:= Empty
;
9548 if Present
(Subtype_Mark
(Formal
)) then
9549 Subt_Mark
:= Subtype_Mark
(Formal
);
9551 Check_Access_Definition
(Formal
);
9552 Acc_Def
:= Access_Definition
(Formal
);
9555 -- Sloc for error message on missing actual
9557 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
9559 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
9560 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
9563 Set_Parent
(List
, Parent
(Actual
));
9567 if Out_Present
(Formal
) then
9569 -- An IN OUT generic actual must be a name. The instantiation is a
9570 -- renaming declaration. The actual is the name being renamed. We
9571 -- use the actual directly, rather than a copy, because it is not
9572 -- used further in the list of actuals, and because a copy or a use
9573 -- of relocate_node is incorrect if the instance is nested within a
9574 -- generic. In order to simplify ASIS searches, the Generic_Parent
9575 -- field links the declaration to the generic association.
9580 Instantiation_Node
, Gen_Obj
);
9582 ("\in instantiation of & declared#",
9583 Instantiation_Node
, Scope
(A_Gen_Obj
));
9584 Abandon_Instantiation
(Instantiation_Node
);
9587 if Present
(Subt_Mark
) then
9589 Make_Object_Renaming_Declaration
(Loc
,
9590 Defining_Identifier
=> New_Copy
(Gen_Obj
),
9591 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
9594 else pragma Assert
(Present
(Acc_Def
));
9596 Make_Object_Renaming_Declaration
(Loc
,
9597 Defining_Identifier
=> New_Copy
(Gen_Obj
),
9598 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
9602 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
9604 -- The analysis of the actual may produce Insert_Action nodes, so
9605 -- the declaration must have a context in which to attach them.
9607 Append
(Decl_Node
, List
);
9610 -- Return if the analysis of the actual reported some error
9612 if Etype
(Actual
) = Any_Type
then
9616 -- This check is performed here because Analyze_Object_Renaming will
9617 -- not check it when Comes_From_Source is False. Note though that the
9618 -- check for the actual being the name of an object will be performed
9619 -- in Analyze_Object_Renaming.
9621 if Is_Object_Reference
(Actual
)
9622 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
9625 ("illegal discriminant-dependent component for in out parameter",
9629 -- The actual has to be resolved in order to check that it is a
9630 -- variable (due to cases such as F (1), where F returns access to
9631 -- an array, and for overloaded prefixes).
9633 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
9635 -- If the type of the formal is not itself a formal, and the current
9636 -- unit is a child unit, the formal type must be declared in a
9637 -- parent, and must be retrieved by visibility.
9640 and then Is_Generic_Unit
(Scope
(Ftyp
))
9641 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
9644 Temp
: constant Node_Id
:=
9645 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
9647 Set_Entity
(Temp
, Empty
);
9649 Ftyp
:= Entity
(Temp
);
9653 if Is_Private_Type
(Ftyp
)
9654 and then not Is_Private_Type
(Etype
(Actual
))
9655 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
9656 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
9658 -- If the actual has the type of the full view of the formal, or
9659 -- else a non-private subtype of the formal, then the visibility
9660 -- of the formal type has changed. Add to the actuals a subtype
9661 -- declaration that will force the exchange of views in the body
9662 -- of the instance as well.
9665 Make_Subtype_Declaration
(Loc
,
9666 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
9667 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
9669 Prepend
(Subt_Decl
, List
);
9671 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
9672 Exchange_Declarations
(Ftyp
);
9675 Resolve
(Actual
, Ftyp
);
9677 if not Denotes_Variable
(Actual
) then
9679 ("actual for& must be a variable", Actual
, Gen_Obj
);
9681 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
9683 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
9684 -- the type of the actual shall resolve to a specific anonymous
9687 if Ada_Version
< Ada_2005
9689 Ekind
(Base_Type
(Ftyp
)) /=
9690 E_Anonymous_Access_Type
9692 Ekind
(Base_Type
(Etype
(Actual
))) /=
9693 E_Anonymous_Access_Type
9695 Error_Msg_NE
("type of actual does not match type of&",
9700 Note_Possible_Modification
(Actual
, Sure
=> True);
9702 -- Check for instantiation of atomic/volatile actual for
9703 -- non-atomic/volatile formal (RM C.6 (12)).
9705 if Is_Atomic_Object
(Actual
)
9706 and then not Is_Atomic
(Orig_Ftyp
)
9709 ("cannot instantiate non-atomic formal object " &
9710 "with atomic actual", Actual
);
9712 elsif Is_Volatile_Object
(Actual
)
9713 and then not Is_Volatile
(Orig_Ftyp
)
9716 ("cannot instantiate non-volatile formal object " &
9717 "with volatile actual", Actual
);
9720 -- Formal in-parameter
9723 -- The instantiation of a generic formal in-parameter is constant
9724 -- declaration. The actual is the expression for that declaration.
9726 if Present
(Actual
) then
9727 if Present
(Subt_Mark
) then
9729 else pragma Assert
(Present
(Acc_Def
));
9734 Make_Object_Declaration
(Loc
,
9735 Defining_Identifier
=> New_Copy
(Gen_Obj
),
9736 Constant_Present
=> True,
9737 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
9738 Object_Definition
=> New_Copy_Tree
(Def
),
9739 Expression
=> Actual
);
9741 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
9743 -- A generic formal object of a tagged type is defined to be
9744 -- aliased so the new constant must also be treated as aliased.
9746 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
9747 Set_Aliased_Present
(Decl_Node
);
9750 Append
(Decl_Node
, List
);
9752 -- No need to repeat (pre-)analysis of some expression nodes
9753 -- already handled in Preanalyze_Actuals.
9755 if Nkind
(Actual
) /= N_Allocator
then
9758 -- Return if the analysis of the actual reported some error
9760 if Etype
(Actual
) = Any_Type
then
9766 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
9770 Typ
:= Get_Instance_Of
(Formal_Type
);
9772 Freeze_Before
(Instantiation_Node
, Typ
);
9774 -- If the actual is an aggregate, perform name resolution on
9775 -- its components (the analysis of an aggregate does not do it)
9776 -- to capture local names that may be hidden if the generic is
9779 if Nkind
(Actual
) = N_Aggregate
then
9780 Preanalyze_And_Resolve
(Actual
, Typ
);
9783 if Is_Limited_Type
(Typ
)
9784 and then not OK_For_Limited_Init
(Typ
, Actual
)
9787 ("initialization not allowed for limited types", Actual
);
9788 Explain_Limited_Type
(Typ
, Actual
);
9792 elsif Present
(Default_Expression
(Formal
)) then
9794 -- Use default to construct declaration
9796 if Present
(Subt_Mark
) then
9798 else pragma Assert
(Present
(Acc_Def
));
9803 Make_Object_Declaration
(Sloc
(Formal
),
9804 Defining_Identifier
=> New_Copy
(Gen_Obj
),
9805 Constant_Present
=> True,
9806 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
9807 Object_Definition
=> New_Copy
(Def
),
9808 Expression
=> New_Copy_Tree
9809 (Default_Expression
(Formal
)));
9811 Append
(Decl_Node
, List
);
9812 Set_Analyzed
(Expression
(Decl_Node
), False);
9817 Instantiation_Node
, Gen_Obj
);
9818 Error_Msg_NE
("\in instantiation of & declared#",
9819 Instantiation_Node
, Scope
(A_Gen_Obj
));
9821 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
9823 -- Create dummy constant declaration so that instance can be
9824 -- analyzed, to minimize cascaded visibility errors.
9826 if Present
(Subt_Mark
) then
9828 else pragma Assert
(Present
(Acc_Def
));
9833 Make_Object_Declaration
(Loc
,
9834 Defining_Identifier
=> New_Copy
(Gen_Obj
),
9835 Constant_Present
=> True,
9836 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
9837 Object_Definition
=> New_Copy
(Def
),
9839 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
9840 Attribute_Name
=> Name_First
,
9841 Prefix
=> New_Copy
(Def
)));
9843 Append
(Decl_Node
, List
);
9846 Abandon_Instantiation
(Instantiation_Node
);
9851 if Nkind
(Actual
) in N_Has_Entity
then
9852 Actual_Decl
:= Parent
(Entity
(Actual
));
9855 -- Ada 2005 (AI-423): For a formal object declaration with a null
9856 -- exclusion or an access definition that has a null exclusion: If the
9857 -- actual matching the formal object declaration denotes a generic
9858 -- formal object of another generic unit G, and the instantiation
9859 -- containing the actual occurs within the body of G or within the body
9860 -- of a generic unit declared within the declarative region of G, then
9861 -- the declaration of the formal object of G must have a null exclusion.
9862 -- Otherwise, the subtype of the actual matching the formal object
9863 -- declaration shall exclude null.
9865 if Ada_Version
>= Ada_2005
9866 and then Present
(Actual_Decl
)
9868 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
9869 N_Object_Declaration
)
9870 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
9871 and then not Has_Null_Exclusion
(Actual_Decl
)
9872 and then Has_Null_Exclusion
(Analyzed_Formal
)
9874 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
9876 ("actual must exclude null to match generic formal#", Actual
);
9879 -- A volatile object cannot be used as an actual in a generic instance.
9880 -- The following check is only relevant when SPARK_Mode is on as it is
9881 -- not a standard Ada legality rule.
9884 and then Present
(Actual
)
9885 and then Is_SPARK_Volatile_Object
(Actual
)
9888 ("volatile object cannot act as actual in generic instantiation "
9889 & "(SPARK RM 7.1.3(8))", Actual
);
9893 end Instantiate_Object
;
9895 ------------------------------
9896 -- Instantiate_Package_Body --
9897 ------------------------------
9899 procedure Instantiate_Package_Body
9900 (Body_Info
: Pending_Body_Info
;
9901 Inlined_Body
: Boolean := False;
9902 Body_Optional
: Boolean := False)
9904 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
9905 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
9906 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
9908 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
9909 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
9910 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
9911 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
9912 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
9914 Act_Body_Name
: Node_Id
;
9916 Gen_Body_Id
: Node_Id
;
9918 Act_Body_Id
: Entity_Id
;
9920 Parent_Installed
: Boolean := False;
9921 Save_Style_Check
: constant Boolean := Style_Check
;
9923 Par_Ent
: Entity_Id
:= Empty
;
9924 Par_Vis
: Boolean := False;
9926 Vis_Prims_List
: Elist_Id
:= No_Elist
;
9927 -- List of primitives made temporarily visible in the instantiation
9928 -- to match the visibility of the formal type
9931 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
9933 -- The instance body may already have been processed, as the parent of
9934 -- another instance that is inlined (Load_Parent_Of_Generic).
9936 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
9940 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
9942 -- Re-establish the state of information on which checks are suppressed.
9943 -- This information was set in Body_Info at the point of instantiation,
9944 -- and now we restore it so that the instance is compiled using the
9945 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9947 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
9948 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
9949 Opt
.Ada_Version
:= Body_Info
.Version
;
9950 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
9951 Restore_Warnings
(Body_Info
.Warnings
);
9952 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
9953 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
9955 if No
(Gen_Body_Id
) then
9956 Load_Parent_Of_Generic
9957 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
9958 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
9961 -- Establish global variable for sloc adjustment and for error recovery
9963 Instantiation_Node
:= Inst_Node
;
9965 if Present
(Gen_Body_Id
) then
9966 Save_Env
(Gen_Unit
, Act_Decl_Id
);
9967 Style_Check
:= False;
9968 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
9970 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
9972 Create_Instantiation_Source
9973 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
9977 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
9979 -- Build new name (possibly qualified) for body declaration
9981 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
9983 -- Some attributes of spec entity are not inherited by body entity
9985 Set_Handler_Records
(Act_Body_Id
, No_List
);
9987 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
9988 N_Defining_Program_Unit_Name
9991 Make_Defining_Program_Unit_Name
(Loc
,
9992 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
9993 Defining_Identifier
=> Act_Body_Id
);
9995 Act_Body_Name
:= Act_Body_Id
;
9998 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
10000 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
10001 Check_Generic_Actuals
(Act_Decl_Id
, False);
10003 -- Install primitives hidden at the point of the instantiation but
10004 -- visible when processing the generic formals
10010 E
:= First_Entity
(Act_Decl_Id
);
10011 while Present
(E
) loop
10013 and then Is_Generic_Actual_Type
(E
)
10014 and then Is_Tagged_Type
(E
)
10016 Install_Hidden_Primitives
10017 (Prims_List
=> Vis_Prims_List
,
10018 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
10026 -- If it is a child unit, make the parent instance (which is an
10027 -- instance of the parent of the generic) visible. The parent
10028 -- instance is the prefix of the name of the generic unit.
10030 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10031 and then Nkind
(Gen_Id
) = N_Expanded_Name
10033 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10034 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10035 Install_Parent
(Par_Ent
, In_Body
=> True);
10036 Parent_Installed
:= True;
10038 elsif Is_Child_Unit
(Gen_Unit
) then
10039 Par_Ent
:= Scope
(Gen_Unit
);
10040 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10041 Install_Parent
(Par_Ent
, In_Body
=> True);
10042 Parent_Installed
:= True;
10045 -- If the instantiation is a library unit, and this is the main unit,
10046 -- then build the resulting compilation unit nodes for the instance.
10047 -- If this is a compilation unit but it is not the main unit, then it
10048 -- is the body of a unit in the context, that is being compiled
10049 -- because it is encloses some inlined unit or another generic unit
10050 -- being instantiated. In that case, this body is not part of the
10051 -- current compilation, and is not attached to the tree, but its
10052 -- parent must be set for analysis.
10054 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10056 -- Replace instance node with body of instance, and create new
10057 -- node for corresponding instance declaration.
10059 Build_Instance_Compilation_Unit_Nodes
10060 (Inst_Node
, Act_Body
, Act_Decl
);
10061 Analyze
(Inst_Node
);
10063 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10065 -- If the instance is a child unit itself, then set the scope
10066 -- of the expanded body to be the parent of the instantiation
10067 -- (ensuring that the fully qualified name will be generated
10068 -- for the elaboration subprogram).
10070 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
10071 N_Defining_Program_Unit_Name
10074 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
10078 -- Case where instantiation is not a library unit
10081 -- If this is an early instantiation, i.e. appears textually
10082 -- before the corresponding body and must be elaborated first,
10083 -- indicate that the body instance is to be delayed.
10085 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
10087 -- Now analyze the body. We turn off all checks if this is an
10088 -- internal unit, since there is no reason to have checks on for
10089 -- any predefined run-time library code. All such code is designed
10090 -- to be compiled with checks off.
10092 -- Note that we do NOT apply this criterion to children of GNAT
10093 -- (or on VMS, children of DEC). The latter units must suppress
10094 -- checks explicitly if this is needed.
10096 if Is_Predefined_File_Name
10097 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
10099 Analyze
(Act_Body
, Suppress
=> All_Checks
);
10101 Analyze
(Act_Body
);
10105 Inherit_Context
(Gen_Body
, Inst_Node
);
10107 -- Remove the parent instances if they have been placed on the scope
10108 -- stack to compile the body.
10110 if Parent_Installed
then
10111 Remove_Parent
(In_Body
=> True);
10113 -- Restore the previous visibility of the parent
10115 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10118 Restore_Hidden_Primitives
(Vis_Prims_List
);
10119 Restore_Private_Views
(Act_Decl_Id
);
10121 -- Remove the current unit from visibility if this is an instance
10122 -- that is not elaborated on the fly for inlining purposes.
10124 if not Inlined_Body
then
10125 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
10129 Style_Check
:= Save_Style_Check
;
10131 -- If we have no body, and the unit requires a body, then complain. This
10132 -- complaint is suppressed if we have detected other errors (since a
10133 -- common reason for missing the body is that it had errors).
10134 -- In CodePeer mode, a warning has been emitted already, no need for
10135 -- further messages.
10137 elsif Unit_Requires_Body
(Gen_Unit
)
10138 and then not Body_Optional
10140 if CodePeer_Mode
then
10143 elsif Serious_Errors_Detected
= 0 then
10145 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
10147 -- Don't attempt to perform any cleanup actions if some other error
10148 -- was already detected, since this can cause blowups.
10154 -- Case of package that does not need a body
10157 -- If the instantiation of the declaration is a library unit, rewrite
10158 -- the original package instantiation as a package declaration in the
10159 -- compilation unit node.
10161 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10162 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
10163 Rewrite
(Inst_Node
, Act_Decl
);
10165 -- Generate elaboration entity, in case spec has elaboration code.
10166 -- This cannot be done when the instance is analyzed, because it
10167 -- is not known yet whether the body exists.
10169 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
10170 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
10172 -- If the instantiation is not a library unit, then append the
10173 -- declaration to the list of implicitly generated entities, unless
10174 -- it is already a list member which means that it was already
10177 elsif not Is_List_Member
(Act_Decl
) then
10178 Mark_Rewrite_Insertion
(Act_Decl
);
10179 Insert_Before
(Inst_Node
, Act_Decl
);
10183 Expander_Mode_Restore
;
10184 end Instantiate_Package_Body
;
10186 ---------------------------------
10187 -- Instantiate_Subprogram_Body --
10188 ---------------------------------
10190 procedure Instantiate_Subprogram_Body
10191 (Body_Info
: Pending_Body_Info
;
10192 Body_Optional
: Boolean := False)
10194 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
10195 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
10196 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
10197 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
10198 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
10199 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
10200 Anon_Id
: constant Entity_Id
:=
10201 Defining_Unit_Name
(Specification
(Act_Decl
));
10202 Pack_Id
: constant Entity_Id
:=
10203 Defining_Unit_Name
(Parent
(Act_Decl
));
10205 Gen_Body
: Node_Id
;
10206 Gen_Body_Id
: Node_Id
;
10207 Act_Body
: Node_Id
;
10208 Pack_Body
: Node_Id
;
10209 Prev_Formal
: Entity_Id
;
10210 Ret_Expr
: Node_Id
;
10211 Unit_Renaming
: Node_Id
;
10213 Parent_Installed
: Boolean := False;
10215 Saved_Style_Check
: constant Boolean := Style_Check
;
10216 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
10218 Par_Ent
: Entity_Id
:= Empty
;
10219 Par_Vis
: Boolean := False;
10222 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10224 -- Subprogram body may have been created already because of an inline
10225 -- pragma, or because of multiple elaborations of the enclosing package
10226 -- when several instances of the subprogram appear in the main unit.
10228 if Present
(Corresponding_Body
(Act_Decl
)) then
10232 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
10234 -- Re-establish the state of information on which checks are suppressed.
10235 -- This information was set in Body_Info at the point of instantiation,
10236 -- and now we restore it so that the instance is compiled using the
10237 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10239 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
10240 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
10241 Opt
.Ada_Version
:= Body_Info
.Version
;
10242 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
10243 Restore_Warnings
(Body_Info
.Warnings
);
10244 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
10245 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
10247 if No
(Gen_Body_Id
) then
10249 -- For imported generic subprogram, no body to compile, complete
10250 -- the spec entity appropriately.
10252 if Is_Imported
(Gen_Unit
) then
10253 Set_Is_Imported
(Anon_Id
);
10254 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
10255 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
10256 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
10257 Set_Has_Completion
(Anon_Id
);
10260 -- For other cases, compile the body
10263 Load_Parent_Of_Generic
10264 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
10265 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10269 Instantiation_Node
:= Inst_Node
;
10271 if Present
(Gen_Body_Id
) then
10272 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
10274 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
10276 -- Either body is not present, or context is non-expanding, as
10277 -- when compiling a subunit. Mark the instance as completed, and
10278 -- diagnose a missing body when needed.
10281 and then Operating_Mode
= Generate_Code
10284 ("missing proper body for instantiation", Gen_Body
);
10287 Set_Has_Completion
(Anon_Id
);
10291 Save_Env
(Gen_Unit
, Anon_Id
);
10292 Style_Check
:= False;
10293 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
10294 Create_Instantiation_Source
10302 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
10304 -- Create proper defining name for the body, to correspond to
10305 -- the one in the spec.
10307 Set_Defining_Unit_Name
(Specification
(Act_Body
),
10308 Make_Defining_Identifier
10309 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
10310 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
10311 Set_Has_Completion
(Anon_Id
);
10312 Check_Generic_Actuals
(Pack_Id
, False);
10314 -- Generate a reference to link the visible subprogram instance to
10315 -- the generic body, which for navigation purposes is the only
10316 -- available source for the instance.
10319 (Related_Instance
(Pack_Id
),
10320 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
10322 -- If it is a child unit, make the parent instance (which is an
10323 -- instance of the parent of the generic) visible. The parent
10324 -- instance is the prefix of the name of the generic unit.
10326 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10327 and then Nkind
(Gen_Id
) = N_Expanded_Name
10329 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10330 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10331 Install_Parent
(Par_Ent
, In_Body
=> True);
10332 Parent_Installed
:= True;
10334 elsif Is_Child_Unit
(Gen_Unit
) then
10335 Par_Ent
:= Scope
(Gen_Unit
);
10336 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10337 Install_Parent
(Par_Ent
, In_Body
=> True);
10338 Parent_Installed
:= True;
10341 -- Inside its body, a reference to the generic unit is a reference
10342 -- to the instance. The corresponding renaming is the first
10343 -- declaration in the body.
10346 Make_Subprogram_Renaming_Declaration
(Loc
,
10348 Copy_Generic_Node
(
10349 Specification
(Original_Node
(Gen_Body
)),
10351 Instantiating
=> True),
10352 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
10354 -- If there is a formal subprogram with the same name as the unit
10355 -- itself, do not add this renaming declaration. This is a temporary
10356 -- fix for one ACVC test. ???
10358 Prev_Formal
:= First_Entity
(Pack_Id
);
10359 while Present
(Prev_Formal
) loop
10360 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
10361 and then Is_Overloadable
(Prev_Formal
)
10366 Next_Entity
(Prev_Formal
);
10369 if Present
(Prev_Formal
) then
10370 Decls
:= New_List
(Act_Body
);
10372 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
10375 -- The subprogram body is placed in the body of a dummy package body,
10376 -- whose spec contains the subprogram declaration as well as the
10377 -- renaming declarations for the generic parameters.
10379 Pack_Body
:= Make_Package_Body
(Loc
,
10380 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
10381 Declarations
=> Decls
);
10383 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
10385 -- If the instantiation is a library unit, then build resulting
10386 -- compilation unit nodes for the instance. The declaration of
10387 -- the enclosing package is the grandparent of the subprogram
10388 -- declaration. First replace the instantiation node as the unit
10389 -- of the corresponding compilation.
10391 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10392 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10393 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
10394 Build_Instance_Compilation_Unit_Nodes
10395 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
10396 Analyze
(Inst_Node
);
10398 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
10399 Analyze
(Pack_Body
);
10403 Insert_Before
(Inst_Node
, Pack_Body
);
10404 Mark_Rewrite_Insertion
(Pack_Body
);
10405 Analyze
(Pack_Body
);
10407 if Expander_Active
then
10408 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
10412 Inherit_Context
(Gen_Body
, Inst_Node
);
10414 Restore_Private_Views
(Pack_Id
, False);
10416 if Parent_Installed
then
10417 Remove_Parent
(In_Body
=> True);
10419 -- Restore the previous visibility of the parent
10421 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10425 Style_Check
:= Saved_Style_Check
;
10426 Restore_Warnings
(Saved_Warnings
);
10428 -- Body not found. Error was emitted already. If there were no previous
10429 -- errors, this may be an instance whose scope is a premature instance.
10430 -- In that case we must insure that the (legal) program does raise
10431 -- program error if executed. We generate a subprogram body for this
10432 -- purpose. See DEC ac30vso.
10434 -- Should not reference proprietary DEC tests in comments ???
10436 elsif Serious_Errors_Detected
= 0
10437 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
10439 if Body_Optional
then
10442 elsif Ekind
(Anon_Id
) = E_Procedure
then
10444 Make_Subprogram_Body
(Loc
,
10446 Make_Procedure_Specification
(Loc
,
10447 Defining_Unit_Name
=>
10448 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10449 Parameter_Specifications
=>
10451 (Parameter_Specifications
(Parent
(Anon_Id
)))),
10453 Declarations
=> Empty_List
,
10454 Handled_Statement_Sequence
=>
10455 Make_Handled_Sequence_Of_Statements
(Loc
,
10458 Make_Raise_Program_Error
(Loc
,
10460 PE_Access_Before_Elaboration
))));
10464 Make_Raise_Program_Error
(Loc
,
10465 Reason
=> PE_Access_Before_Elaboration
);
10467 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
10468 Set_Analyzed
(Ret_Expr
);
10471 Make_Subprogram_Body
(Loc
,
10473 Make_Function_Specification
(Loc
,
10474 Defining_Unit_Name
=>
10475 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10476 Parameter_Specifications
=>
10478 (Parameter_Specifications
(Parent
(Anon_Id
))),
10479 Result_Definition
=>
10480 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
10482 Declarations
=> Empty_List
,
10483 Handled_Statement_Sequence
=>
10484 Make_Handled_Sequence_Of_Statements
(Loc
,
10487 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
10490 Pack_Body
:= Make_Package_Body
(Loc
,
10491 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
10492 Declarations
=> New_List
(Act_Body
));
10494 Insert_After
(Inst_Node
, Pack_Body
);
10495 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
10496 Analyze
(Pack_Body
);
10499 Expander_Mode_Restore
;
10500 end Instantiate_Subprogram_Body
;
10502 ----------------------
10503 -- Instantiate_Type --
10504 ----------------------
10506 function Instantiate_Type
10509 Analyzed_Formal
: Node_Id
;
10510 Actual_Decls
: List_Id
) return List_Id
10512 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
10513 A_Gen_T
: constant Entity_Id
:=
10514 Defining_Identifier
(Analyzed_Formal
);
10515 Ancestor
: Entity_Id
:= Empty
;
10516 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
10518 Decl_Node
: Node_Id
;
10519 Decl_Nodes
: List_Id
;
10523 procedure Validate_Array_Type_Instance
;
10524 procedure Validate_Access_Subprogram_Instance
;
10525 procedure Validate_Access_Type_Instance
;
10526 procedure Validate_Derived_Type_Instance
;
10527 procedure Validate_Derived_Interface_Type_Instance
;
10528 procedure Validate_Discriminated_Formal_Type
;
10529 procedure Validate_Interface_Type_Instance
;
10530 procedure Validate_Private_Type_Instance
;
10531 procedure Validate_Incomplete_Type_Instance
;
10532 -- These procedures perform validation tests for the named case.
10533 -- Validate_Discriminated_Formal_Type is shared by formal private
10534 -- types and Ada 2012 formal incomplete types.
10536 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
10537 -- Check that base types are the same and that the subtypes match
10538 -- statically. Used in several of the above.
10540 --------------------
10541 -- Subtypes_Match --
10542 --------------------
10544 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
10545 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
10548 -- Some detailed comments would be useful here ???
10550 return ((Base_Type
(T
) = Act_T
10551 or else Base_Type
(T
) = Base_Type
(Act_T
))
10552 and then Subtypes_Statically_Match
(T
, Act_T
))
10554 or else (Is_Class_Wide_Type
(Gen_T
)
10555 and then Is_Class_Wide_Type
(Act_T
)
10556 and then Subtypes_Match
10557 (Get_Instance_Of
(Root_Type
(Gen_T
)),
10558 Root_Type
(Act_T
)))
10561 (Ekind_In
(Gen_T
, E_Anonymous_Access_Subprogram_Type
,
10562 E_Anonymous_Access_Type
)
10563 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
10564 and then Subtypes_Statically_Match
10565 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
10566 end Subtypes_Match
;
10568 -----------------------------------------
10569 -- Validate_Access_Subprogram_Instance --
10570 -----------------------------------------
10572 procedure Validate_Access_Subprogram_Instance
is
10574 if not Is_Access_Type
(Act_T
)
10575 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
10578 ("expect access type in instantiation of &", Actual
, Gen_T
);
10579 Abandon_Instantiation
(Actual
);
10582 -- According to AI05-288, actuals for access_to_subprograms must be
10583 -- subtype conformant with the generic formal. Previous to AI05-288
10584 -- only mode conformance was required.
10586 -- This is a binding interpretation that applies to previous versions
10587 -- of the language, no need to maintain previous weaker checks.
10589 Check_Subtype_Conformant
10590 (Designated_Type
(Act_T
),
10591 Designated_Type
(A_Gen_T
),
10595 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
10596 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
10598 ("protected access type not allowed for formal &",
10602 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
10604 ("expect protected access type for formal &",
10607 end Validate_Access_Subprogram_Instance
;
10609 -----------------------------------
10610 -- Validate_Access_Type_Instance --
10611 -----------------------------------
10613 procedure Validate_Access_Type_Instance
is
10614 Desig_Type
: constant Entity_Id
:=
10615 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
10616 Desig_Act
: Entity_Id
;
10619 if not Is_Access_Type
(Act_T
) then
10621 ("expect access type in instantiation of &", Actual
, Gen_T
);
10622 Abandon_Instantiation
(Actual
);
10625 if Is_Access_Constant
(A_Gen_T
) then
10626 if not Is_Access_Constant
(Act_T
) then
10628 ("actual type must be access-to-constant type", Actual
);
10629 Abandon_Instantiation
(Actual
);
10632 if Is_Access_Constant
(Act_T
) then
10634 ("actual type must be access-to-variable type", Actual
);
10635 Abandon_Instantiation
(Actual
);
10637 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
10638 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
10640 Error_Msg_N
-- CODEFIX
10641 ("actual must be general access type!", Actual
);
10642 Error_Msg_NE
-- CODEFIX
10643 ("add ALL to }!", Actual
, Act_T
);
10644 Abandon_Instantiation
(Actual
);
10648 -- The designated subtypes, that is to say the subtypes introduced
10649 -- by an access type declaration (and not by a subtype declaration)
10652 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
10654 -- The designated type may have been introduced through a limited_
10655 -- with clause, in which case retrieve the non-limited view. This
10656 -- applies to incomplete types as well as to class-wide types.
10658 if From_Limited_With
(Desig_Act
) then
10659 Desig_Act
:= Available_View
(Desig_Act
);
10662 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
10664 ("designated type of actual does not match that of formal &",
10667 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
10668 Error_Msg_N
("\predicates do not match", Actual
);
10671 Abandon_Instantiation
(Actual
);
10673 elsif Is_Access_Type
(Designated_Type
(Act_T
))
10674 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
10676 Is_Constrained
(Designated_Type
(Desig_Type
))
10679 ("designated type of actual does not match that of formal &",
10682 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
10683 Error_Msg_N
("\predicates do not match", Actual
);
10686 Abandon_Instantiation
(Actual
);
10689 -- Ada 2005: null-exclusion indicators of the two types must agree
10691 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
10693 ("non null exclusion of actual and formal & do not match",
10696 end Validate_Access_Type_Instance
;
10698 ----------------------------------
10699 -- Validate_Array_Type_Instance --
10700 ----------------------------------
10702 procedure Validate_Array_Type_Instance
is
10707 function Formal_Dimensions
return Int
;
10708 -- Count number of dimensions in array type formal
10710 -----------------------
10711 -- Formal_Dimensions --
10712 -----------------------
10714 function Formal_Dimensions
return Int
is
10719 if Nkind
(Def
) = N_Constrained_Array_Definition
then
10720 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
10722 Index
:= First
(Subtype_Marks
(Def
));
10725 while Present
(Index
) loop
10727 Next_Index
(Index
);
10731 end Formal_Dimensions
;
10733 -- Start of processing for Validate_Array_Type_Instance
10736 if not Is_Array_Type
(Act_T
) then
10738 ("expect array type in instantiation of &", Actual
, Gen_T
);
10739 Abandon_Instantiation
(Actual
);
10741 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
10742 if not (Is_Constrained
(Act_T
)) then
10744 ("expect constrained array in instantiation of &",
10746 Abandon_Instantiation
(Actual
);
10750 if Is_Constrained
(Act_T
) then
10752 ("expect unconstrained array in instantiation of &",
10754 Abandon_Instantiation
(Actual
);
10758 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
10760 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
10761 Abandon_Instantiation
(Actual
);
10764 I1
:= First_Index
(A_Gen_T
);
10765 I2
:= First_Index
(Act_T
);
10766 for J
in 1 .. Formal_Dimensions
loop
10768 -- If the indexes of the actual were given by a subtype_mark,
10769 -- the index was transformed into a range attribute. Retrieve
10770 -- the original type mark for checking.
10772 if Is_Entity_Name
(Original_Node
(I2
)) then
10773 T2
:= Entity
(Original_Node
(I2
));
10778 if not Subtypes_Match
10779 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
10782 ("index types of actual do not match those of formal &",
10784 Abandon_Instantiation
(Actual
);
10791 -- Check matching subtypes. Note that there are complex visibility
10792 -- issues when the generic is a child unit and some aspect of the
10793 -- generic type is declared in a parent unit of the generic. We do
10794 -- the test to handle this special case only after a direct check
10795 -- for static matching has failed. The case where both the component
10796 -- type and the array type are separate formals, and the component
10797 -- type is a private view may also require special checking in
10801 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
10802 or else Subtypes_Match
10803 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
10804 Component_Type
(Act_T
))
10809 ("component subtype of actual does not match that of formal &",
10811 Abandon_Instantiation
(Actual
);
10814 if Has_Aliased_Components
(A_Gen_T
)
10815 and then not Has_Aliased_Components
(Act_T
)
10818 ("actual must have aliased components to match formal type &",
10821 end Validate_Array_Type_Instance
;
10823 -----------------------------------------------
10824 -- Validate_Derived_Interface_Type_Instance --
10825 -----------------------------------------------
10827 procedure Validate_Derived_Interface_Type_Instance
is
10828 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
10832 -- First apply interface instance checks
10834 Validate_Interface_Type_Instance
;
10836 -- Verify that immediate parent interface is an ancestor of
10840 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
10843 ("interface actual must include progenitor&", Actual
, Par
);
10846 -- Now verify that the actual includes all other ancestors of
10849 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
10850 while Present
(Elmt
) loop
10851 if not Interface_Present_In_Ancestor
10852 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
10855 ("interface actual must include progenitor&",
10856 Actual
, Node
(Elmt
));
10861 end Validate_Derived_Interface_Type_Instance
;
10863 ------------------------------------
10864 -- Validate_Derived_Type_Instance --
10865 ------------------------------------
10867 procedure Validate_Derived_Type_Instance
is
10868 Actual_Discr
: Entity_Id
;
10869 Ancestor_Discr
: Entity_Id
;
10872 -- If the parent type in the generic declaration is itself a previous
10873 -- formal type, then it is local to the generic and absent from the
10874 -- analyzed generic definition. In that case the ancestor is the
10875 -- instance of the formal (which must have been instantiated
10876 -- previously), unless the ancestor is itself a formal derived type.
10877 -- In this latter case (which is the subject of Corrigendum 8652/0038
10878 -- (AI-202) the ancestor of the formals is the ancestor of its
10879 -- parent. Otherwise, the analyzed generic carries the parent type.
10880 -- If the parent type is defined in a previous formal package, then
10881 -- the scope of that formal package is that of the generic type
10882 -- itself, and it has already been mapped into the corresponding type
10883 -- in the actual package.
10885 -- Common case: parent type defined outside of the generic
10887 if Is_Entity_Name
(Subtype_Mark
(Def
))
10888 and then Present
(Entity
(Subtype_Mark
(Def
)))
10890 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
10892 -- Check whether parent is defined in a previous formal package
10895 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
10898 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
10900 -- The type may be a local derivation, or a type extension of a
10901 -- previous formal, or of a formal of a parent package.
10903 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
10905 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
10907 -- Check whether the parent is another derived formal type in the
10908 -- same generic unit.
10910 if Etype
(A_Gen_T
) /= A_Gen_T
10911 and then Is_Generic_Type
(Etype
(A_Gen_T
))
10912 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
10913 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
10915 -- Locate ancestor of parent from the subtype declaration
10916 -- created for the actual.
10922 Decl
:= First
(Actual_Decls
);
10923 while Present
(Decl
) loop
10924 if Nkind
(Decl
) = N_Subtype_Declaration
10925 and then Chars
(Defining_Identifier
(Decl
)) =
10926 Chars
(Etype
(A_Gen_T
))
10928 Ancestor
:= Generic_Parent_Type
(Decl
);
10936 pragma Assert
(Present
(Ancestor
));
10938 -- The ancestor itself may be a previous formal that has been
10941 Ancestor
:= Get_Instance_Of
(Ancestor
);
10945 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
10948 -- An unusual case: the actual is a type declared in a parent unit,
10949 -- but is not a formal type so there is no instance_of for it.
10950 -- Retrieve it by analyzing the record extension.
10952 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
10953 and then In_Open_Scopes
(Scope
(Act_T
))
10954 and then Is_Generic_Instance
(Scope
(Act_T
))
10956 Analyze
(Subtype_Mark
(Def
));
10957 Ancestor
:= Entity
(Subtype_Mark
(Def
));
10960 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
10963 -- If the formal derived type has pragma Preelaborable_Initialization
10964 -- then the actual type must have preelaborable initialization.
10966 if Known_To_Have_Preelab_Init
(A_Gen_T
)
10967 and then not Has_Preelaborable_Initialization
(Act_T
)
10970 ("actual for & must have preelaborable initialization",
10974 -- Ada 2005 (AI-251)
10976 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
10977 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
10979 ("(Ada 2005) expected type implementing & in instantiation",
10983 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
10985 ("expect type derived from & in instantiation",
10986 Actual
, First_Subtype
(Ancestor
));
10987 Abandon_Instantiation
(Actual
);
10990 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10991 -- that the formal type declaration has been rewritten as a private
10994 if Ada_Version
>= Ada_2005
10995 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
10996 and then Synchronized_Present
(Parent
(A_Gen_T
))
10998 -- The actual must be a synchronized tagged type
11000 if not Is_Tagged_Type
(Act_T
) then
11002 ("actual of synchronized type must be tagged", Actual
);
11003 Abandon_Instantiation
(Actual
);
11005 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
11006 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
11007 N_Derived_Type_Definition
11008 and then not Synchronized_Present
(Type_Definition
11012 ("actual of synchronized type must be synchronized", Actual
);
11013 Abandon_Instantiation
(Actual
);
11017 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
11018 -- removes the second instance of the phrase "or allow pass by copy".
11020 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
11022 ("cannot have atomic actual type for non-atomic formal type",
11025 elsif Is_Volatile
(Act_T
) and then not Is_Volatile
(Ancestor
) then
11027 ("cannot have volatile actual type for non-volatile formal type",
11031 -- It should not be necessary to check for unknown discriminants on
11032 -- Formal, but for some reason Has_Unknown_Discriminants is false for
11033 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
11034 -- needs fixing. ???
11036 if not Is_Indefinite_Subtype
(A_Gen_T
)
11037 and then not Unknown_Discriminants_Present
(Formal
)
11038 and then Is_Indefinite_Subtype
(Act_T
)
11041 ("actual subtype must be constrained", Actual
);
11042 Abandon_Instantiation
(Actual
);
11045 if not Unknown_Discriminants_Present
(Formal
) then
11046 if Is_Constrained
(Ancestor
) then
11047 if not Is_Constrained
(Act_T
) then
11049 ("actual subtype must be constrained", Actual
);
11050 Abandon_Instantiation
(Actual
);
11053 -- Ancestor is unconstrained, Check if generic formal and actual
11054 -- agree on constrainedness. The check only applies to array types
11055 -- and discriminated types.
11057 elsif Is_Constrained
(Act_T
) then
11058 if Ekind
(Ancestor
) = E_Access_Type
11060 (not Is_Constrained
(A_Gen_T
)
11061 and then Is_Composite_Type
(A_Gen_T
))
11064 ("actual subtype must be unconstrained", Actual
);
11065 Abandon_Instantiation
(Actual
);
11068 -- A class-wide type is only allowed if the formal has unknown
11071 elsif Is_Class_Wide_Type
(Act_T
)
11072 and then not Has_Unknown_Discriminants
(Ancestor
)
11075 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
11076 Abandon_Instantiation
(Actual
);
11078 -- Otherwise, the formal and actual shall have the same number
11079 -- of discriminants and each discriminant of the actual must
11080 -- correspond to a discriminant of the formal.
11082 elsif Has_Discriminants
(Act_T
)
11083 and then not Has_Unknown_Discriminants
(Act_T
)
11084 and then Has_Discriminants
(Ancestor
)
11086 Actual_Discr
:= First_Discriminant
(Act_T
);
11087 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
11088 while Present
(Actual_Discr
)
11089 and then Present
(Ancestor_Discr
)
11091 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
11092 No
(Corresponding_Discriminant
(Actual_Discr
))
11095 ("discriminant & does not correspond " &
11096 "to ancestor discriminant", Actual
, Actual_Discr
);
11097 Abandon_Instantiation
(Actual
);
11100 Next_Discriminant
(Actual_Discr
);
11101 Next_Discriminant
(Ancestor_Discr
);
11104 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
11106 ("actual for & must have same number of discriminants",
11108 Abandon_Instantiation
(Actual
);
11111 -- This case should be caught by the earlier check for
11112 -- constrainedness, but the check here is added for completeness.
11114 elsif Has_Discriminants
(Act_T
)
11115 and then not Has_Unknown_Discriminants
(Act_T
)
11118 ("actual for & must not have discriminants", Actual
, Gen_T
);
11119 Abandon_Instantiation
(Actual
);
11121 elsif Has_Discriminants
(Ancestor
) then
11123 ("actual for & must have known discriminants", Actual
, Gen_T
);
11124 Abandon_Instantiation
(Actual
);
11127 if not Subtypes_Statically_Compatible
11128 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
11131 ("constraint on actual is incompatible with formal", Actual
);
11132 Abandon_Instantiation
(Actual
);
11136 -- If the formal and actual types are abstract, check that there
11137 -- are no abstract primitives of the actual type that correspond to
11138 -- nonabstract primitives of the formal type (second sentence of
11141 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
11142 Check_Abstract_Primitives
: declare
11143 Gen_Prims
: constant Elist_Id
:=
11144 Primitive_Operations
(A_Gen_T
);
11145 Gen_Elmt
: Elmt_Id
;
11146 Gen_Subp
: Entity_Id
;
11147 Anc_Subp
: Entity_Id
;
11148 Anc_Formal
: Entity_Id
;
11149 Anc_F_Type
: Entity_Id
;
11151 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
11152 Act_Elmt
: Elmt_Id
;
11153 Act_Subp
: Entity_Id
;
11154 Act_Formal
: Entity_Id
;
11155 Act_F_Type
: Entity_Id
;
11157 Subprograms_Correspond
: Boolean;
11159 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
11160 -- Returns true if T2 is derived directly or indirectly from
11161 -- T1, including derivations from interfaces. T1 and T2 are
11162 -- required to be specific tagged base types.
11164 ------------------------
11165 -- Is_Tagged_Ancestor --
11166 ------------------------
11168 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
11170 Intfc_Elmt
: Elmt_Id
;
11173 -- The predicate is satisfied if the types are the same
11178 -- If we've reached the top of the derivation chain then
11179 -- we know that T1 is not an ancestor of T2.
11181 elsif Etype
(T2
) = T2
then
11184 -- Proceed to check T2's immediate parent
11186 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
11189 -- Finally, check to see if T1 is an ancestor of any of T2's
11193 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
11194 while Present
(Intfc_Elmt
) loop
11195 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
11199 Next_Elmt
(Intfc_Elmt
);
11204 end Is_Tagged_Ancestor
;
11206 -- Start of processing for Check_Abstract_Primitives
11209 -- Loop over all of the formal derived type's primitives
11211 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
11212 while Present
(Gen_Elmt
) loop
11213 Gen_Subp
:= Node
(Gen_Elmt
);
11215 -- If the primitive of the formal is not abstract, then
11216 -- determine whether there is a corresponding primitive of
11217 -- the actual type that's abstract.
11219 if not Is_Abstract_Subprogram
(Gen_Subp
) then
11220 Act_Elmt
:= First_Elmt
(Act_Prims
);
11221 while Present
(Act_Elmt
) loop
11222 Act_Subp
:= Node
(Act_Elmt
);
11224 -- If we find an abstract primitive of the actual,
11225 -- then we need to test whether it corresponds to the
11226 -- subprogram from which the generic formal primitive
11229 if Is_Abstract_Subprogram
(Act_Subp
) then
11230 Anc_Subp
:= Alias
(Gen_Subp
);
11232 -- Test whether we have a corresponding primitive
11233 -- by comparing names, kinds, formal types, and
11236 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
11237 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
11239 Anc_Formal
:= First_Formal
(Anc_Subp
);
11240 Act_Formal
:= First_Formal
(Act_Subp
);
11241 while Present
(Anc_Formal
)
11242 and then Present
(Act_Formal
)
11244 Anc_F_Type
:= Etype
(Anc_Formal
);
11245 Act_F_Type
:= Etype
(Act_Formal
);
11247 if Ekind
(Anc_F_Type
)
11248 = E_Anonymous_Access_Type
11250 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
11252 if Ekind
(Act_F_Type
)
11253 = E_Anonymous_Access_Type
11256 Designated_Type
(Act_F_Type
);
11262 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
11267 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11268 Act_F_Type
:= Base_Type
(Act_F_Type
);
11270 -- If the formal is controlling, then the
11271 -- the type of the actual primitive's formal
11272 -- must be derived directly or indirectly
11273 -- from the type of the ancestor primitive's
11276 if Is_Controlling_Formal
(Anc_Formal
) then
11277 if not Is_Tagged_Ancestor
11278 (Anc_F_Type
, Act_F_Type
)
11283 -- Otherwise the types of the formals must
11286 elsif Anc_F_Type
/= Act_F_Type
then
11290 Next_Entity
(Anc_Formal
);
11291 Next_Entity
(Act_Formal
);
11294 -- If we traversed through all of the formals
11295 -- then so far the subprograms correspond, so
11296 -- now check that any result types correspond.
11298 if No
(Anc_Formal
) and then No
(Act_Formal
) then
11299 Subprograms_Correspond
:= True;
11301 if Ekind
(Act_Subp
) = E_Function
then
11302 Anc_F_Type
:= Etype
(Anc_Subp
);
11303 Act_F_Type
:= Etype
(Act_Subp
);
11305 if Ekind
(Anc_F_Type
)
11306 = E_Anonymous_Access_Type
11309 Designated_Type
(Anc_F_Type
);
11311 if Ekind
(Act_F_Type
)
11312 = E_Anonymous_Access_Type
11315 Designated_Type
(Act_F_Type
);
11317 Subprograms_Correspond
:= False;
11322 = E_Anonymous_Access_Type
11324 Subprograms_Correspond
:= False;
11327 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11328 Act_F_Type
:= Base_Type
(Act_F_Type
);
11330 -- Now either the result types must be
11331 -- the same or, if the result type is
11332 -- controlling, the result type of the
11333 -- actual primitive must descend from the
11334 -- result type of the ancestor primitive.
11336 if Subprograms_Correspond
11337 and then Anc_F_Type
/= Act_F_Type
11339 Has_Controlling_Result
(Anc_Subp
)
11341 not Is_Tagged_Ancestor
11342 (Anc_F_Type
, Act_F_Type
)
11344 Subprograms_Correspond
:= False;
11348 -- Found a matching subprogram belonging to
11349 -- formal ancestor type, so actual subprogram
11350 -- corresponds and this violates 3.9.3(9).
11352 if Subprograms_Correspond
then
11354 ("abstract subprogram & overrides " &
11355 "nonabstract subprogram of ancestor",
11363 Next_Elmt
(Act_Elmt
);
11367 Next_Elmt
(Gen_Elmt
);
11369 end Check_Abstract_Primitives
;
11372 -- Verify that limitedness matches. If parent is a limited
11373 -- interface then the generic formal is not unless declared
11374 -- explicitly so. If not declared limited, the actual cannot be
11375 -- limited (see AI05-0087).
11377 -- Even though this AI is a binding interpretation, we enable the
11378 -- check only in Ada 2012 mode, because this improper construct
11379 -- shows up in user code and in existing B-tests.
11381 if Is_Limited_Type
(Act_T
)
11382 and then not Is_Limited_Type
(A_Gen_T
)
11383 and then Ada_Version
>= Ada_2012
11385 if In_Instance
then
11389 ("actual for non-limited & cannot be a limited type", Actual
,
11391 Explain_Limited_Type
(Act_T
, Actual
);
11392 Abandon_Instantiation
(Actual
);
11395 end Validate_Derived_Type_Instance
;
11397 ----------------------------------------
11398 -- Validate_Discriminated_Formal_Type --
11399 ----------------------------------------
11401 procedure Validate_Discriminated_Formal_Type
is
11402 Formal_Discr
: Entity_Id
;
11403 Actual_Discr
: Entity_Id
;
11404 Formal_Subt
: Entity_Id
;
11407 if Has_Discriminants
(A_Gen_T
) then
11408 if not Has_Discriminants
(Act_T
) then
11410 ("actual for & must have discriminants", Actual
, Gen_T
);
11411 Abandon_Instantiation
(Actual
);
11413 elsif Is_Constrained
(Act_T
) then
11415 ("actual for & must be unconstrained", Actual
, Gen_T
);
11416 Abandon_Instantiation
(Actual
);
11419 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
11420 Actual_Discr
:= First_Discriminant
(Act_T
);
11421 while Formal_Discr
/= Empty
loop
11422 if Actual_Discr
= Empty
then
11424 ("discriminants on actual do not match formal",
11426 Abandon_Instantiation
(Actual
);
11429 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
11431 -- Access discriminants match if designated types do
11433 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
11434 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
11435 E_Anonymous_Access_Type
11438 (Designated_Type
(Base_Type
(Formal_Subt
))) =
11439 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
11443 elsif Base_Type
(Formal_Subt
) /=
11444 Base_Type
(Etype
(Actual_Discr
))
11447 ("types of actual discriminants must match formal",
11449 Abandon_Instantiation
(Actual
);
11451 elsif not Subtypes_Statically_Match
11452 (Formal_Subt
, Etype
(Actual_Discr
))
11453 and then Ada_Version
>= Ada_95
11456 ("subtypes of actual discriminants must match formal",
11458 Abandon_Instantiation
(Actual
);
11461 Next_Discriminant
(Formal_Discr
);
11462 Next_Discriminant
(Actual_Discr
);
11465 if Actual_Discr
/= Empty
then
11467 ("discriminants on actual do not match formal",
11469 Abandon_Instantiation
(Actual
);
11473 end Validate_Discriminated_Formal_Type
;
11475 ---------------------------------------
11476 -- Validate_Incomplete_Type_Instance --
11477 ---------------------------------------
11479 procedure Validate_Incomplete_Type_Instance
is
11481 if not Is_Tagged_Type
(Act_T
)
11482 and then Is_Tagged_Type
(A_Gen_T
)
11485 ("actual for & must be a tagged type", Actual
, Gen_T
);
11488 Validate_Discriminated_Formal_Type
;
11489 end Validate_Incomplete_Type_Instance
;
11491 --------------------------------------
11492 -- Validate_Interface_Type_Instance --
11493 --------------------------------------
11495 procedure Validate_Interface_Type_Instance
is
11497 if not Is_Interface
(Act_T
) then
11499 ("actual for formal interface type must be an interface",
11502 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
11504 Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
11506 Is_Protected_Interface
(A_Gen_T
) /=
11507 Is_Protected_Interface
(Act_T
)
11509 Is_Synchronized_Interface
(A_Gen_T
) /=
11510 Is_Synchronized_Interface
(Act_T
)
11513 ("actual for interface& does not match (RM 12.5.5(4))",
11516 end Validate_Interface_Type_Instance
;
11518 ------------------------------------
11519 -- Validate_Private_Type_Instance --
11520 ------------------------------------
11522 procedure Validate_Private_Type_Instance
is
11524 if Is_Limited_Type
(Act_T
)
11525 and then not Is_Limited_Type
(A_Gen_T
)
11527 if In_Instance
then
11531 ("actual for non-limited & cannot be a limited type", Actual
,
11533 Explain_Limited_Type
(Act_T
, Actual
);
11534 Abandon_Instantiation
(Actual
);
11537 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
11538 and then not Has_Preelaborable_Initialization
(Act_T
)
11541 ("actual for & must have preelaborable initialization", Actual
,
11544 elsif Is_Indefinite_Subtype
(Act_T
)
11545 and then not Is_Indefinite_Subtype
(A_Gen_T
)
11546 and then Ada_Version
>= Ada_95
11549 ("actual for & must be a definite subtype", Actual
, Gen_T
);
11551 elsif not Is_Tagged_Type
(Act_T
)
11552 and then Is_Tagged_Type
(A_Gen_T
)
11555 ("actual for & must be a tagged type", Actual
, Gen_T
);
11558 Validate_Discriminated_Formal_Type
;
11560 end Validate_Private_Type_Instance
;
11562 -- Start of processing for Instantiate_Type
11565 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
11566 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
11567 return New_List
(Error
);
11569 elsif not Is_Entity_Name
(Actual
)
11570 or else not Is_Type
(Entity
(Actual
))
11573 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
11574 Abandon_Instantiation
(Actual
);
11577 Act_T
:= Entity
(Actual
);
11579 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
11580 -- as a generic actual parameter if the corresponding formal type
11581 -- does not have a known_discriminant_part, or is a formal derived
11582 -- type that is an Unchecked_Union type.
11584 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
11585 if not Has_Discriminants
(A_Gen_T
)
11587 (Is_Derived_Type
(A_Gen_T
)
11589 Is_Unchecked_Union
(A_Gen_T
))
11593 Error_Msg_N
("unchecked union cannot be the actual for a" &
11594 " discriminated formal type", Act_T
);
11599 -- Deal with fixed/floating restrictions
11601 if Is_Floating_Point_Type
(Act_T
) then
11602 Check_Restriction
(No_Floating_Point
, Actual
);
11603 elsif Is_Fixed_Point_Type
(Act_T
) then
11604 Check_Restriction
(No_Fixed_Point
, Actual
);
11607 -- Deal with error of using incomplete type as generic actual.
11608 -- This includes limited views of a type, even if the non-limited
11609 -- view may be available.
11611 if Ekind
(Act_T
) = E_Incomplete_Type
11612 or else (Is_Class_Wide_Type
(Act_T
)
11614 Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
11616 -- If the formal is an incomplete type, the actual can be
11617 -- incomplete as well.
11619 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
11622 elsif Is_Class_Wide_Type
(Act_T
)
11623 or else No
(Full_View
(Act_T
))
11625 Error_Msg_N
("premature use of incomplete type", Actual
);
11626 Abandon_Instantiation
(Actual
);
11628 Act_T
:= Full_View
(Act_T
);
11629 Set_Entity
(Actual
, Act_T
);
11631 if Has_Private_Component
(Act_T
) then
11633 ("premature use of type with private component", Actual
);
11637 -- Deal with error of premature use of private type as generic actual
11639 elsif Is_Private_Type
(Act_T
)
11640 and then Is_Private_Type
(Base_Type
(Act_T
))
11641 and then not Is_Generic_Type
(Act_T
)
11642 and then not Is_Derived_Type
(Act_T
)
11643 and then No
(Full_View
(Root_Type
(Act_T
)))
11645 -- If the formal is an incomplete type, the actual can be
11646 -- private or incomplete as well.
11648 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
11651 Error_Msg_N
("premature use of private type", Actual
);
11654 elsif Has_Private_Component
(Act_T
) then
11656 ("premature use of type with private component", Actual
);
11659 Set_Instance_Of
(A_Gen_T
, Act_T
);
11661 -- If the type is generic, the class-wide type may also be used
11663 if Is_Tagged_Type
(A_Gen_T
)
11664 and then Is_Tagged_Type
(Act_T
)
11665 and then not Is_Class_Wide_Type
(A_Gen_T
)
11667 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
11668 Class_Wide_Type
(Act_T
));
11671 if not Is_Abstract_Type
(A_Gen_T
)
11672 and then Is_Abstract_Type
(Act_T
)
11675 ("actual of non-abstract formal cannot be abstract", Actual
);
11678 -- A generic scalar type is a first subtype for which we generate
11679 -- an anonymous base type. Indicate that the instance of this base
11680 -- is the base type of the actual.
11682 if Is_Scalar_Type
(A_Gen_T
) then
11683 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
11687 if Error_Posted
(Act_T
) then
11690 case Nkind
(Def
) is
11691 when N_Formal_Private_Type_Definition
=>
11692 Validate_Private_Type_Instance
;
11694 when N_Formal_Incomplete_Type_Definition
=>
11695 Validate_Incomplete_Type_Instance
;
11697 when N_Formal_Derived_Type_Definition
=>
11698 Validate_Derived_Type_Instance
;
11700 when N_Formal_Discrete_Type_Definition
=>
11701 if not Is_Discrete_Type
(Act_T
) then
11703 ("expect discrete type in instantiation of&",
11705 Abandon_Instantiation
(Actual
);
11708 when N_Formal_Signed_Integer_Type_Definition
=>
11709 if not Is_Signed_Integer_Type
(Act_T
) then
11711 ("expect signed integer type in instantiation of&",
11713 Abandon_Instantiation
(Actual
);
11716 when N_Formal_Modular_Type_Definition
=>
11717 if not Is_Modular_Integer_Type
(Act_T
) then
11719 ("expect modular type in instantiation of &",
11721 Abandon_Instantiation
(Actual
);
11724 when N_Formal_Floating_Point_Definition
=>
11725 if not Is_Floating_Point_Type
(Act_T
) then
11727 ("expect float type in instantiation of &", Actual
, Gen_T
);
11728 Abandon_Instantiation
(Actual
);
11731 when N_Formal_Ordinary_Fixed_Point_Definition
=>
11732 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
11734 ("expect ordinary fixed point type in instantiation of &",
11736 Abandon_Instantiation
(Actual
);
11739 when N_Formal_Decimal_Fixed_Point_Definition
=>
11740 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
11742 ("expect decimal type in instantiation of &",
11744 Abandon_Instantiation
(Actual
);
11747 when N_Array_Type_Definition
=>
11748 Validate_Array_Type_Instance
;
11750 when N_Access_To_Object_Definition
=>
11751 Validate_Access_Type_Instance
;
11753 when N_Access_Function_Definition |
11754 N_Access_Procedure_Definition
=>
11755 Validate_Access_Subprogram_Instance
;
11757 when N_Record_Definition
=>
11758 Validate_Interface_Type_Instance
;
11760 when N_Derived_Type_Definition
=>
11761 Validate_Derived_Interface_Type_Instance
;
11764 raise Program_Error
;
11769 Subt
:= New_Copy
(Gen_T
);
11771 -- Use adjusted sloc of subtype name as the location for other nodes in
11772 -- the subtype declaration.
11774 Loc
:= Sloc
(Subt
);
11777 Make_Subtype_Declaration
(Loc
,
11778 Defining_Identifier
=> Subt
,
11779 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
11781 if Is_Private_Type
(Act_T
) then
11782 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
11784 elsif Is_Access_Type
(Act_T
)
11785 and then Is_Private_Type
(Designated_Type
(Act_T
))
11787 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
11790 Decl_Nodes
:= New_List
(Decl_Node
);
11792 -- Flag actual derived types so their elaboration produces the
11793 -- appropriate renamings for the primitive operations of the ancestor.
11794 -- Flag actual for formal private types as well, to determine whether
11795 -- operations in the private part may override inherited operations.
11796 -- If the formal has an interface list, the ancestor is not the
11797 -- parent, but the analyzed formal that includes the interface
11798 -- operations of all its progenitors.
11800 -- Same treatment for formal private types, so we can check whether the
11801 -- type is tagged limited when validating derivations in the private
11802 -- part. (See AI05-096).
11804 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
11805 if Present
(Interface_List
(Def
)) then
11806 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
11808 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
11811 elsif Nkind_In
(Def
,
11812 N_Formal_Private_Type_Definition
,
11813 N_Formal_Incomplete_Type_Definition
)
11815 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
11818 -- If the actual is a synchronized type that implements an interface,
11819 -- the primitive operations are attached to the corresponding record,
11820 -- and we have to treat it as an additional generic actual, so that its
11821 -- primitive operations become visible in the instance. The task or
11822 -- protected type itself does not carry primitive operations.
11824 if Is_Concurrent_Type
(Act_T
)
11825 and then Is_Tagged_Type
(Act_T
)
11826 and then Present
(Corresponding_Record_Type
(Act_T
))
11827 and then Present
(Ancestor
)
11828 and then Is_Interface
(Ancestor
)
11831 Corr_Rec
: constant Entity_Id
:=
11832 Corresponding_Record_Type
(Act_T
);
11833 New_Corr
: Entity_Id
;
11834 Corr_Decl
: Node_Id
;
11837 New_Corr
:= Make_Temporary
(Loc
, 'S');
11839 Make_Subtype_Declaration
(Loc
,
11840 Defining_Identifier
=> New_Corr
,
11841 Subtype_Indication
=>
11842 New_Occurrence_Of
(Corr_Rec
, Loc
));
11843 Append_To
(Decl_Nodes
, Corr_Decl
);
11845 if Ekind
(Act_T
) = E_Task_Type
then
11846 Set_Ekind
(Subt
, E_Task_Subtype
);
11848 Set_Ekind
(Subt
, E_Protected_Subtype
);
11851 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
11852 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
11853 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
11858 end Instantiate_Type
;
11860 ---------------------
11861 -- Is_In_Main_Unit --
11862 ---------------------
11864 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
11865 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
11866 Current_Unit
: Node_Id
;
11869 if Unum
= Main_Unit
then
11872 -- If the current unit is a subunit then it is either the main unit or
11873 -- is being compiled as part of the main unit.
11875 elsif Nkind
(N
) = N_Compilation_Unit
then
11876 return Nkind
(Unit
(N
)) = N_Subunit
;
11879 Current_Unit
:= Parent
(N
);
11880 while Present
(Current_Unit
)
11881 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
11883 Current_Unit
:= Parent
(Current_Unit
);
11886 -- The instantiation node is in the main unit, or else the current node
11887 -- (perhaps as the result of nested instantiations) is in the main unit,
11888 -- or in the declaration of the main unit, which in this last case must
11891 return Unum
= Main_Unit
11892 or else Current_Unit
= Cunit
(Main_Unit
)
11893 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
11894 or else (Present
(Library_Unit
(Current_Unit
))
11895 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
11896 end Is_In_Main_Unit
;
11898 ----------------------------
11899 -- Load_Parent_Of_Generic --
11900 ----------------------------
11902 procedure Load_Parent_Of_Generic
11905 Body_Optional
: Boolean := False)
11907 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
11908 Saved_Style_Check
: constant Boolean := Style_Check
;
11909 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
11910 True_Parent
: Node_Id
;
11911 Inst_Node
: Node_Id
;
11913 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
11915 procedure Collect_Previous_Instances
(Decls
: List_Id
);
11916 -- Collect all instantiations in the given list of declarations, that
11917 -- precede the generic that we need to load. If the bodies of these
11918 -- instantiations are available, we must analyze them, to ensure that
11919 -- the public symbols generated are the same when the unit is compiled
11920 -- to generate code, and when it is compiled in the context of a unit
11921 -- that needs a particular nested instance. This process is applied to
11922 -- both package and subprogram instances.
11924 --------------------------------
11925 -- Collect_Previous_Instances --
11926 --------------------------------
11928 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
11932 Decl
:= First
(Decls
);
11933 while Present
(Decl
) loop
11934 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
11937 -- If Decl is an instantiation, then record it as requiring
11938 -- instantiation of the corresponding body, except if it is an
11939 -- abbreviated instantiation generated internally for conformance
11940 -- checking purposes only for the case of a formal package
11941 -- declared without a box (see Instantiate_Formal_Package). Such
11942 -- an instantiation does not generate any code (the actual code
11943 -- comes from actual) and thus does not need to be analyzed here.
11944 -- If the instantiation appears with a generic package body it is
11945 -- not analyzed here either.
11947 elsif Nkind
(Decl
) = N_Package_Instantiation
11948 and then not Is_Internal
(Defining_Entity
(Decl
))
11950 Append_Elmt
(Decl
, Previous_Instances
);
11952 -- For a subprogram instantiation, omit instantiations intrinsic
11953 -- operations (Unchecked_Conversions, etc.) that have no bodies.
11955 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
11956 N_Procedure_Instantiation
)
11957 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
11959 Append_Elmt
(Decl
, Previous_Instances
);
11961 elsif Nkind
(Decl
) = N_Package_Declaration
then
11962 Collect_Previous_Instances
11963 (Visible_Declarations
(Specification
(Decl
)));
11964 Collect_Previous_Instances
11965 (Private_Declarations
(Specification
(Decl
)));
11967 -- Previous non-generic bodies may contain instances as well
11969 elsif Nkind
(Decl
) = N_Package_Body
11970 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
11972 Collect_Previous_Instances
(Declarations
(Decl
));
11974 elsif Nkind
(Decl
) = N_Subprogram_Body
11975 and then not Acts_As_Spec
(Decl
)
11976 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
11978 Collect_Previous_Instances
(Declarations
(Decl
));
11983 end Collect_Previous_Instances
;
11985 -- Start of processing for Load_Parent_Of_Generic
11988 if not In_Same_Source_Unit
(N
, Spec
)
11989 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
11990 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
11991 and then not Is_In_Main_Unit
(Spec
))
11993 -- Find body of parent of spec, and analyze it. A special case arises
11994 -- when the parent is an instantiation, that is to say when we are
11995 -- currently instantiating a nested generic. In that case, there is
11996 -- no separate file for the body of the enclosing instance. Instead,
11997 -- the enclosing body must be instantiated as if it were a pending
11998 -- instantiation, in order to produce the body for the nested generic
11999 -- we require now. Note that in that case the generic may be defined
12000 -- in a package body, the instance defined in the same package body,
12001 -- and the original enclosing body may not be in the main unit.
12003 Inst_Node
:= Empty
;
12005 True_Parent
:= Parent
(Spec
);
12006 while Present
(True_Parent
)
12007 and then Nkind
(True_Parent
) /= N_Compilation_Unit
12009 if Nkind
(True_Parent
) = N_Package_Declaration
12011 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
12013 -- Parent is a compilation unit that is an instantiation.
12014 -- Instantiation node has been replaced with package decl.
12016 Inst_Node
:= Original_Node
(True_Parent
);
12019 elsif Nkind
(True_Parent
) = N_Package_Declaration
12020 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
12021 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12023 -- Parent is an instantiation within another specification.
12024 -- Declaration for instance has been inserted before original
12025 -- instantiation node. A direct link would be preferable?
12027 Inst_Node
:= Next
(True_Parent
);
12028 while Present
(Inst_Node
)
12029 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
12034 -- If the instance appears within a generic, and the generic
12035 -- unit is defined within a formal package of the enclosing
12036 -- generic, there is no generic body available, and none
12037 -- needed. A more precise test should be used ???
12039 if No
(Inst_Node
) then
12046 True_Parent
:= Parent
(True_Parent
);
12050 -- Case where we are currently instantiating a nested generic
12052 if Present
(Inst_Node
) then
12053 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
12055 -- Instantiation node and declaration of instantiated package
12056 -- were exchanged when only the declaration was needed.
12057 -- Restore instantiation node before proceeding with body.
12059 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
12062 -- Now complete instantiation of enclosing body, if it appears in
12063 -- some other unit. If it appears in the current unit, the body
12064 -- will have been instantiated already.
12066 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12068 -- We need to determine the expander mode to instantiate the
12069 -- enclosing body. Because the generic body we need may use
12070 -- global entities declared in the enclosing package (including
12071 -- aggregates) it is in general necessary to compile this body
12072 -- with expansion enabled, except if we are within a generic
12073 -- package, in which case the usual generic rule applies.
12076 Exp_Status
: Boolean := True;
12080 -- Loop through scopes looking for generic package
12082 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
12083 while Present
(Scop
)
12084 and then Scop
/= Standard_Standard
12086 if Ekind
(Scop
) = E_Generic_Package
then
12087 Exp_Status
:= False;
12091 Scop
:= Scope
(Scop
);
12094 -- Collect previous instantiations in the unit that contains
12095 -- the desired generic.
12097 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12098 and then not Body_Optional
12102 Info
: Pending_Body_Info
;
12106 Par
:= Parent
(Inst_Node
);
12107 while Present
(Par
) loop
12108 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
12109 Par
:= Parent
(Par
);
12112 pragma Assert
(Present
(Par
));
12114 if Nkind
(Par
) = N_Package_Body
then
12115 Collect_Previous_Instances
(Declarations
(Par
));
12117 elsif Nkind
(Par
) = N_Package_Declaration
then
12118 Collect_Previous_Instances
12119 (Visible_Declarations
(Specification
(Par
)));
12120 Collect_Previous_Instances
12121 (Private_Declarations
(Specification
(Par
)));
12124 -- Enclosing unit is a subprogram body. In this
12125 -- case all instance bodies are processed in order
12126 -- and there is no need to collect them separately.
12131 Decl
:= First_Elmt
(Previous_Instances
);
12132 while Present
(Decl
) loop
12134 (Inst_Node
=> Node
(Decl
),
12136 Instance_Spec
(Node
(Decl
)),
12137 Expander_Status
=> Exp_Status
,
12138 Current_Sem_Unit
=>
12139 Get_Code_Unit
(Sloc
(Node
(Decl
))),
12140 Scope_Suppress
=> Scope_Suppress
,
12141 Local_Suppress_Stack_Top
=>
12142 Local_Suppress_Stack_Top
,
12143 Version
=> Ada_Version
,
12144 Version_Pragma
=> Ada_Version_Pragma
,
12145 Warnings
=> Save_Warnings
,
12146 SPARK_Mode
=> SPARK_Mode
,
12147 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
);
12149 -- Package instance
12152 Nkind
(Node
(Decl
)) = N_Package_Instantiation
12154 Instantiate_Package_Body
12155 (Info
, Body_Optional
=> True);
12157 -- Subprogram instance
12160 -- The instance_spec is the wrapper package,
12161 -- and the subprogram declaration is the last
12162 -- declaration in the wrapper.
12166 (Visible_Declarations
12167 (Specification
(Info
.Act_Decl
)));
12169 Instantiate_Subprogram_Body
12170 (Info
, Body_Optional
=> True);
12178 Instantiate_Package_Body
12180 ((Inst_Node
=> Inst_Node
,
12181 Act_Decl
=> True_Parent
,
12182 Expander_Status
=> Exp_Status
,
12183 Current_Sem_Unit
=> Get_Code_Unit
12184 (Sloc
(Inst_Node
)),
12185 Scope_Suppress
=> Scope_Suppress
,
12186 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
12187 Version
=> Ada_Version
,
12188 Version_Pragma
=> Ada_Version_Pragma
,
12189 Warnings
=> Save_Warnings
,
12190 SPARK_Mode
=> SPARK_Mode
,
12191 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
12192 Body_Optional
=> Body_Optional
);
12196 -- Case where we are not instantiating a nested generic
12199 Opt
.Style_Check
:= False;
12200 Expander_Mode_Save_And_Set
(True);
12201 Load_Needed_Body
(Comp_Unit
, OK
);
12202 Opt
.Style_Check
:= Saved_Style_Check
;
12203 Restore_Warnings
(Saved_Warnings
);
12204 Expander_Mode_Restore
;
12207 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
12208 and then not Body_Optional
12211 Bname
: constant Unit_Name_Type
:=
12212 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
12215 -- In CodePeer mode, the missing body may make the analysis
12216 -- incomplete, but we do not treat it as fatal.
12218 if CodePeer_Mode
then
12222 Error_Msg_Unit_1
:= Bname
;
12223 Error_Msg_N
("this instantiation requires$!", N
);
12224 Error_Msg_File_1
:=
12225 Get_File_Name
(Bname
, Subunit
=> False);
12226 Error_Msg_N
("\but file{ was not found!", N
);
12227 raise Unrecoverable_Error
;
12234 -- If loading parent of the generic caused an instantiation circularity,
12235 -- we abandon compilation at this point, because otherwise in some cases
12236 -- we get into trouble with infinite recursions after this point.
12238 if Circularity_Detected
then
12239 raise Unrecoverable_Error
;
12241 end Load_Parent_Of_Generic
;
12243 ---------------------------------
12244 -- Map_Formal_Package_Entities --
12245 ---------------------------------
12247 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
12252 Set_Instance_Of
(Form
, Act
);
12254 -- Traverse formal and actual package to map the corresponding entities.
12255 -- We skip over internal entities that may be generated during semantic
12256 -- analysis, and find the matching entities by name, given that they
12257 -- must appear in the same order.
12259 E1
:= First_Entity
(Form
);
12260 E2
:= First_Entity
(Act
);
12261 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
12262 -- Could this test be a single condition??? Seems like it could, and
12263 -- isn't FPE (Form) a constant anyway???
12265 if not Is_Internal
(E1
)
12266 and then Present
(Parent
(E1
))
12267 and then not Is_Class_Wide_Type
(E1
)
12268 and then not Is_Internal_Name
(Chars
(E1
))
12270 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
12277 Set_Instance_Of
(E1
, E2
);
12279 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
12280 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
12283 if Is_Constrained
(E1
) then
12284 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
12287 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
12288 Map_Formal_Package_Entities
(E1
, E2
);
12295 end Map_Formal_Package_Entities
;
12297 -----------------------
12298 -- Move_Freeze_Nodes --
12299 -----------------------
12301 procedure Move_Freeze_Nodes
12302 (Out_Of
: Entity_Id
;
12307 Next_Decl
: Node_Id
;
12308 Next_Node
: Node_Id
:= After
;
12311 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
12312 -- Check whether entity is declared in a scope external to that of the
12315 -------------------
12316 -- Is_Outer_Type --
12317 -------------------
12319 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
12320 Scop
: Entity_Id
:= Scope
(T
);
12323 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
12327 while Scop
/= Standard_Standard
loop
12328 if Scop
= Out_Of
then
12331 Scop
:= Scope
(Scop
);
12339 -- Start of processing for Move_Freeze_Nodes
12346 -- First remove the freeze nodes that may appear before all other
12350 while Present
(Decl
)
12351 and then Nkind
(Decl
) = N_Freeze_Entity
12352 and then Is_Outer_Type
(Entity
(Decl
))
12354 Decl
:= Remove_Head
(L
);
12355 Insert_After
(Next_Node
, Decl
);
12356 Set_Analyzed
(Decl
, False);
12361 -- Next scan the list of declarations and remove each freeze node that
12362 -- appears ahead of the current node.
12364 while Present
(Decl
) loop
12365 while Present
(Next
(Decl
))
12366 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
12367 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
12369 Next_Decl
:= Remove_Next
(Decl
);
12370 Insert_After
(Next_Node
, Next_Decl
);
12371 Set_Analyzed
(Next_Decl
, False);
12372 Next_Node
:= Next_Decl
;
12375 -- If the declaration is a nested package or concurrent type, then
12376 -- recurse. Nested generic packages will have been processed from the
12379 case Nkind
(Decl
) is
12380 when N_Package_Declaration
=>
12381 Spec
:= Specification
(Decl
);
12383 when N_Task_Type_Declaration
=>
12384 Spec
:= Task_Definition
(Decl
);
12386 when N_Protected_Type_Declaration
=>
12387 Spec
:= Protected_Definition
(Decl
);
12393 if Present
(Spec
) then
12394 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
12395 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
12400 end Move_Freeze_Nodes
;
12406 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
12408 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
12411 ------------------------
12412 -- Preanalyze_Actuals --
12413 ------------------------
12415 procedure Preanalyze_Actuals
(N
: Node_Id
) is
12418 Errs
: constant Int
:= Serious_Errors_Detected
;
12420 Cur
: Entity_Id
:= Empty
;
12421 -- Current homograph of the instance name
12424 -- Saved visibility status of the current homograph
12427 Assoc
:= First
(Generic_Associations
(N
));
12429 -- If the instance is a child unit, its name may hide an outer homonym,
12430 -- so make it invisible to perform name resolution on the actuals.
12432 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
12434 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
12436 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
12438 if Is_Compilation_Unit
(Cur
) then
12439 Vis
:= Is_Immediately_Visible
(Cur
);
12440 Set_Is_Immediately_Visible
(Cur
, False);
12446 while Present
(Assoc
) loop
12447 if Nkind
(Assoc
) /= N_Others_Choice
then
12448 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
12450 -- Within a nested instantiation, a defaulted actual is an empty
12451 -- association, so nothing to analyze. If the subprogram actual
12452 -- is an attribute, analyze prefix only, because actual is not a
12453 -- complete attribute reference.
12455 -- If actual is an allocator, analyze expression only. The full
12456 -- analysis can generate code, and if instance is a compilation
12457 -- unit we have to wait until the package instance is installed
12458 -- to have a proper place to insert this code.
12460 -- String literals may be operators, but at this point we do not
12461 -- know whether the actual is a formal subprogram or a string.
12466 elsif Nkind
(Act
) = N_Attribute_Reference
then
12467 Analyze
(Prefix
(Act
));
12469 elsif Nkind
(Act
) = N_Explicit_Dereference
then
12470 Analyze
(Prefix
(Act
));
12472 elsif Nkind
(Act
) = N_Allocator
then
12474 Expr
: constant Node_Id
:= Expression
(Act
);
12477 if Nkind
(Expr
) = N_Subtype_Indication
then
12478 Analyze
(Subtype_Mark
(Expr
));
12480 -- Analyze separately each discriminant constraint, when
12481 -- given with a named association.
12487 Constr
:= First
(Constraints
(Constraint
(Expr
)));
12488 while Present
(Constr
) loop
12489 if Nkind
(Constr
) = N_Discriminant_Association
then
12490 Analyze
(Expression
(Constr
));
12504 elsif Nkind
(Act
) /= N_Operator_Symbol
then
12508 -- Ensure that a ghost subprogram does not act as generic actual
12510 if Is_Entity_Name
(Act
)
12511 and then Is_Ghost_Subprogram
(Entity
(Act
))
12514 ("ghost subprogram & cannot act as generic actual", Act
);
12515 Abandon_Instantiation
(Act
);
12517 elsif Errs
/= Serious_Errors_Detected
then
12519 -- Do a minimal analysis of the generic, to prevent spurious
12520 -- warnings complaining about the generic being unreferenced,
12521 -- before abandoning the instantiation.
12523 Analyze
(Name
(N
));
12525 if Is_Entity_Name
(Name
(N
))
12526 and then Etype
(Name
(N
)) /= Any_Type
12528 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
12529 Set_Is_Instantiated
(Entity
(Name
(N
)));
12532 if Present
(Cur
) then
12534 -- For the case of a child instance hiding an outer homonym,
12535 -- provide additional warning which might explain the error.
12537 Set_Is_Immediately_Visible
(Cur
, Vis
);
12538 Error_Msg_NE
("& hides outer unit with the same name??",
12539 N
, Defining_Unit_Name
(N
));
12542 Abandon_Instantiation
(Act
);
12549 if Present
(Cur
) then
12550 Set_Is_Immediately_Visible
(Cur
, Vis
);
12552 end Preanalyze_Actuals
;
12554 -------------------
12555 -- Remove_Parent --
12556 -------------------
12558 procedure Remove_Parent
(In_Body
: Boolean := False) is
12559 S
: Entity_Id
:= Current_Scope
;
12560 -- S is the scope containing the instantiation just completed. The scope
12561 -- stack contains the parent instances of the instantiation, followed by
12570 -- After child instantiation is complete, remove from scope stack the
12571 -- extra copy of the current scope, and then remove parent instances.
12573 if not In_Body
then
12576 while Current_Scope
/= S
loop
12577 P
:= Current_Scope
;
12578 End_Package_Scope
(Current_Scope
);
12580 if In_Open_Scopes
(P
) then
12581 E
:= First_Entity
(P
);
12582 while Present
(E
) loop
12583 Set_Is_Immediately_Visible
(E
, True);
12587 -- If instantiation is declared in a block, it is the enclosing
12588 -- scope that might be a parent instance. Note that only one
12589 -- block can be involved, because the parent instances have
12590 -- been installed within it.
12592 if Ekind
(P
) = E_Block
then
12593 Cur_P
:= Scope
(P
);
12598 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
12599 -- We are within an instance of some sibling. Retain
12600 -- visibility of parent, for proper subsequent cleanup, and
12601 -- reinstall private declarations as well.
12603 Set_In_Private_Part
(P
);
12604 Install_Private_Declarations
(P
);
12607 -- If the ultimate parent is a top-level unit recorded in
12608 -- Instance_Parent_Unit, then reset its visibility to what it was
12609 -- before instantiation. (It's not clear what the purpose is of
12610 -- testing whether Scope (P) is In_Open_Scopes, but that test was
12611 -- present before the ultimate parent test was added.???)
12613 elsif not In_Open_Scopes
(Scope
(P
))
12614 or else (P
= Instance_Parent_Unit
12615 and then not Parent_Unit_Visible
)
12617 Set_Is_Immediately_Visible
(P
, False);
12619 -- If the current scope is itself an instantiation of a generic
12620 -- nested within P, and we are in the private part of body of this
12621 -- instantiation, restore the full views of P, that were removed
12622 -- in End_Package_Scope above. This obscure case can occur when a
12623 -- subunit of a generic contains an instance of a child unit of
12624 -- its generic parent unit.
12626 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
12628 Par
: constant Entity_Id
:=
12629 Generic_Parent
(Package_Specification
(S
));
12632 and then P
= Scope
(Par
)
12633 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
12635 Set_In_Private_Part
(P
);
12636 Install_Private_Declarations
(P
);
12642 -- Reset visibility of entities in the enclosing scope
12644 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
12646 Hidden
:= First_Elmt
(Hidden_Entities
);
12647 while Present
(Hidden
) loop
12648 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
12649 Next_Elmt
(Hidden
);
12653 -- Each body is analyzed separately, and there is no context that
12654 -- needs preserving from one body instance to the next, so remove all
12655 -- parent scopes that have been installed.
12657 while Present
(S
) loop
12658 End_Package_Scope
(S
);
12659 Set_Is_Immediately_Visible
(S
, False);
12660 S
:= Current_Scope
;
12661 exit when S
= Standard_Standard
;
12670 procedure Restore_Env
is
12671 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
12674 if No
(Current_Instantiated_Parent
.Act_Id
) then
12675 -- Restore environment after subprogram inlining
12677 Restore_Private_Views
(Empty
);
12680 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
12681 Exchanged_Views
:= Saved
.Exchanged_Views
;
12682 Hidden_Entities
:= Saved
.Hidden_Entities
;
12683 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
12684 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
12685 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
12687 Restore_Opt_Config_Switches
(Saved
.Switches
);
12689 Instance_Envs
.Decrement_Last
;
12692 ---------------------------
12693 -- Restore_Private_Views --
12694 ---------------------------
12696 procedure Restore_Private_Views
12697 (Pack_Id
: Entity_Id
;
12698 Is_Package
: Boolean := True)
12703 Dep_Elmt
: Elmt_Id
;
12706 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
12707 -- Hide the generic formals of formal packages declared with box which
12708 -- were reachable in the current instantiation.
12710 ---------------------------
12711 -- Restore_Nested_Formal --
12712 ---------------------------
12714 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
12718 if Present
(Renamed_Object
(Formal
))
12719 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
12723 elsif Present
(Associated_Formal_Package
(Formal
)) then
12724 Ent
:= First_Entity
(Formal
);
12725 while Present
(Ent
) loop
12726 exit when Ekind
(Ent
) = E_Package
12727 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
12729 Set_Is_Hidden
(Ent
);
12730 Set_Is_Potentially_Use_Visible
(Ent
, False);
12732 -- If package, then recurse
12734 if Ekind
(Ent
) = E_Package
then
12735 Restore_Nested_Formal
(Ent
);
12741 end Restore_Nested_Formal
;
12743 -- Start of processing for Restore_Private_Views
12746 M
:= First_Elmt
(Exchanged_Views
);
12747 while Present
(M
) loop
12750 -- Subtypes of types whose views have been exchanged, and that are
12751 -- defined within the instance, were not on the Private_Dependents
12752 -- list on entry to the instance, so they have to be exchanged
12753 -- explicitly now, in order to remain consistent with the view of the
12756 if Ekind_In
(Typ
, E_Private_Type
,
12757 E_Limited_Private_Type
,
12758 E_Record_Type_With_Private
)
12760 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
12761 while Present
(Dep_Elmt
) loop
12762 Dep_Typ
:= Node
(Dep_Elmt
);
12764 if Scope
(Dep_Typ
) = Pack_Id
12765 and then Present
(Full_View
(Dep_Typ
))
12767 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
12768 Exchange_Declarations
(Dep_Typ
);
12771 Next_Elmt
(Dep_Elmt
);
12775 Exchange_Declarations
(Node
(M
));
12779 if No
(Pack_Id
) then
12783 -- Make the generic formal parameters private, and make the formal types
12784 -- into subtypes of the actuals again.
12786 E
:= First_Entity
(Pack_Id
);
12787 while Present
(E
) loop
12788 Set_Is_Hidden
(E
, True);
12791 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
12793 -- If the actual for E is itself a generic actual type from
12794 -- an enclosing instance, E is still a generic actual type
12795 -- outside of the current instance. This matter when resolving
12796 -- an overloaded call that may be ambiguous in the enclosing
12797 -- instance, when two of its actuals coincide.
12799 if Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
12800 and then Is_Generic_Actual_Type
12801 (Entity
(Subtype_Indication
(Parent
(E
))))
12805 Set_Is_Generic_Actual_Type
(E
, False);
12808 -- An unusual case of aliasing: the actual may also be directly
12809 -- visible in the generic, and be private there, while it is fully
12810 -- visible in the context of the instance. The internal subtype
12811 -- is private in the instance but has full visibility like its
12812 -- parent in the enclosing scope. This enforces the invariant that
12813 -- the privacy status of all private dependents of a type coincide
12814 -- with that of the parent type. This can only happen when a
12815 -- generic child unit is instantiated within a sibling.
12817 if Is_Private_Type
(E
)
12818 and then not Is_Private_Type
(Etype
(E
))
12820 Exchange_Declarations
(E
);
12823 elsif Ekind
(E
) = E_Package
then
12825 -- The end of the renaming list is the renaming of the generic
12826 -- package itself. If the instance is a subprogram, all entities
12827 -- in the corresponding package are renamings. If this entity is
12828 -- a formal package, make its own formals private as well. The
12829 -- actual in this case is itself the renaming of an instantiation.
12830 -- If the entity is not a package renaming, it is the entity
12831 -- created to validate formal package actuals: ignore it.
12833 -- If the actual is itself a formal package for the enclosing
12834 -- generic, or the actual for such a formal package, it remains
12835 -- visible on exit from the instance, and therefore nothing needs
12836 -- to be done either, except to keep it accessible.
12838 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
12841 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
12845 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
12847 Set_Is_Hidden
(E
, False);
12851 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
12855 Id
:= First_Entity
(Act_P
);
12857 and then Id
/= First_Private_Entity
(Act_P
)
12859 exit when Ekind
(Id
) = E_Package
12860 and then Renamed_Object
(Id
) = Act_P
;
12862 Set_Is_Hidden
(Id
, True);
12863 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
12865 if Ekind
(Id
) = E_Package
then
12866 Restore_Nested_Formal
(Id
);
12877 end Restore_Private_Views
;
12884 (Gen_Unit
: Entity_Id
;
12885 Act_Unit
: Entity_Id
)
12889 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
12892 ----------------------------
12893 -- Save_Global_References --
12894 ----------------------------
12896 procedure Save_Global_References
(N
: Node_Id
) is
12897 Gen_Scope
: Entity_Id
;
12901 function Is_Global
(E
: Entity_Id
) return Boolean;
12902 -- Check whether entity is defined outside of generic unit. Examine the
12903 -- scope of an entity, and the scope of the scope, etc, until we find
12904 -- either Standard, in which case the entity is global, or the generic
12905 -- unit itself, which indicates that the entity is local. If the entity
12906 -- is the generic unit itself, as in the case of a recursive call, or
12907 -- the enclosing generic unit, if different from the current scope, then
12908 -- it is local as well, because it will be replaced at the point of
12909 -- instantiation. On the other hand, if it is a reference to a child
12910 -- unit of a common ancestor, which appears in an instantiation, it is
12911 -- global because it is used to denote a specific compilation unit at
12912 -- the time the instantiations will be analyzed.
12914 procedure Reset_Entity
(N
: Node_Id
);
12915 -- Save semantic information on global entity so that it is not resolved
12916 -- again at instantiation time.
12918 procedure Save_Entity_Descendants
(N
: Node_Id
);
12919 -- Apply Save_Global_References to the two syntactic descendants of
12920 -- non-terminal nodes that carry an Associated_Node and are processed
12921 -- through Reset_Entity. Once the global entity (if any) has been
12922 -- captured together with its type, only two syntactic descendants need
12923 -- to be traversed to complete the processing of the tree rooted at N.
12924 -- This applies to Selected_Components, Expanded_Names, and to Operator
12925 -- nodes. N can also be a character literal, identifier, or operator
12926 -- symbol node, but the call has no effect in these cases.
12928 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
12929 -- Default actuals in nested instances must be handled specially
12930 -- because there is no link to them from the original tree. When an
12931 -- actual subprogram is given by a default, we add an explicit generic
12932 -- association for it in the instantiation node. When we save the
12933 -- global references on the name of the instance, we recover the list
12934 -- of generic associations, and add an explicit one to the original
12935 -- generic tree, through which a global actual can be preserved.
12936 -- Similarly, if a child unit is instantiated within a sibling, in the
12937 -- context of the parent, we must preserve the identifier of the parent
12938 -- so that it can be properly resolved in a subsequent instantiation.
12940 procedure Save_Global_Descendant
(D
: Union_Id
);
12941 -- Apply Save_Global_References recursively to the descendents of the
12944 procedure Save_References
(N
: Node_Id
);
12945 -- This is the recursive procedure that does the work, once the
12946 -- enclosing generic scope has been established.
12952 function Is_Global
(E
: Entity_Id
) return Boolean is
12955 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
12956 -- Determine whether the parent node of a reference to a child unit
12957 -- denotes an instantiation or a formal package, in which case the
12958 -- reference to the child unit is global, even if it appears within
12959 -- the current scope (e.g. when the instance appears within the body
12960 -- of an ancestor).
12962 ----------------------
12963 -- Is_Instance_Node --
12964 ----------------------
12966 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
12968 return Nkind
(Decl
) in N_Generic_Instantiation
12970 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
12971 end Is_Instance_Node
;
12973 -- Start of processing for Is_Global
12976 if E
= Gen_Scope
then
12979 elsif E
= Standard_Standard
then
12982 elsif Is_Child_Unit
(E
)
12983 and then (Is_Instance_Node
(Parent
(N2
))
12984 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
12985 and then N2
= Selector_Name
(Parent
(N2
))
12987 Is_Instance_Node
(Parent
(Parent
(N2
)))))
12993 while Se
/= Gen_Scope
loop
12994 if Se
= Standard_Standard
then
13009 procedure Reset_Entity
(N
: Node_Id
) is
13011 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
13012 -- If the type of N2 is global to the generic unit, save the type in
13013 -- the generic node. Just as we perform name capture for explicit
13014 -- references within the generic, we must capture the global types
13015 -- of local entities because they may participate in resolution in
13018 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
13019 -- Find the ultimate ancestor of the current unit. If it is not a
13020 -- generic unit, then the name of the current unit in the prefix of
13021 -- an expanded name must be replaced with its generic homonym to
13022 -- ensure that it will be properly resolved in an instance.
13024 ---------------------
13025 -- Set_Global_Type --
13026 ---------------------
13028 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
13029 Typ
: constant Entity_Id
:= Etype
(N2
);
13032 Set_Etype
(N
, Typ
);
13034 if Entity
(N
) /= N2
13035 and then Has_Private_View
(Entity
(N
))
13037 -- If the entity of N is not the associated node, this is a
13038 -- nested generic and it has an associated node as well, whose
13039 -- type is already the full view (see below). Indicate that the
13040 -- original node has a private view.
13042 Set_Has_Private_View
(N
);
13045 -- If not a private type, nothing else to do
13047 if not Is_Private_Type
(Typ
) then
13048 if Is_Array_Type
(Typ
)
13049 and then Is_Private_Type
(Component_Type
(Typ
))
13051 Set_Has_Private_View
(N
);
13054 -- If it is a derivation of a private type in a context where no
13055 -- full view is needed, nothing to do either.
13057 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
13060 -- Otherwise mark the type for flipping and use the full view when
13064 Set_Has_Private_View
(N
);
13066 if Present
(Full_View
(Typ
)) then
13067 Set_Etype
(N2
, Full_View
(Typ
));
13070 end Set_Global_Type
;
13076 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
13081 while Is_Child_Unit
(Par
) loop
13082 Par
:= Scope
(Par
);
13088 -- Start of processing for Reset_Entity
13091 N2
:= Get_Associated_Node
(N
);
13094 if Present
(E
) then
13096 -- If the node is an entry call to an entry in an enclosing task,
13097 -- it is rewritten as a selected component. No global entity to
13098 -- preserve in this case, since the expansion will be redone in
13101 if not Nkind_In
(E
, N_Defining_Identifier
,
13102 N_Defining_Character_Literal
,
13103 N_Defining_Operator_Symbol
)
13105 Set_Associated_Node
(N
, Empty
);
13106 Set_Etype
(N
, Empty
);
13110 -- If the entity is an itype created as a subtype of an access
13111 -- type with a null exclusion restore source entity for proper
13112 -- visibility. The itype will be created anew in the instance.
13115 and then Ekind
(E
) = E_Access_Subtype
13116 and then Is_Entity_Name
(N
)
13117 and then Chars
(Etype
(E
)) = Chars
(N
)
13120 Set_Entity
(N2
, E
);
13124 if Is_Global
(E
) then
13126 -- If the entity is a package renaming that is the prefix of
13127 -- an expanded name, it has been rewritten as the renamed
13128 -- package, which is necessary semantically but complicates
13129 -- ASIS tree traversal, so we recover the original entity to
13130 -- expose the renaming. Take into account that the context may
13131 -- be a nested generic, that the original node may itself have
13132 -- an associated node that had better be an entity, and that
13133 -- the current node is still a selected component.
13135 if Ekind
(E
) = E_Package
13136 and then Nkind
(N
) = N_Selected_Component
13137 and then Nkind
(Parent
(N
)) = N_Expanded_Name
13138 and then Present
(Original_Node
(N2
))
13139 and then Is_Entity_Name
(Original_Node
(N2
))
13140 and then Present
(Entity
(Original_Node
(N2
)))
13142 if Is_Global
(Entity
(Original_Node
(N2
))) then
13143 N2
:= Original_Node
(N2
);
13144 Set_Associated_Node
(N
, N2
);
13145 Set_Global_Type
(N
, N2
);
13148 -- Renaming is local, and will be resolved in instance
13150 Set_Associated_Node
(N
, Empty
);
13151 Set_Etype
(N
, Empty
);
13155 Set_Global_Type
(N
, N2
);
13158 elsif Nkind
(N
) = N_Op_Concat
13159 and then Is_Generic_Type
(Etype
(N2
))
13160 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
13162 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
13163 and then Is_Intrinsic_Subprogram
(E
)
13168 -- Entity is local. Mark generic node as unresolved.
13169 -- Note that now it does not have an entity.
13171 Set_Associated_Node
(N
, Empty
);
13172 Set_Etype
(N
, Empty
);
13175 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
13176 and then N
= Name
(Parent
(N
))
13178 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
13181 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13182 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
13184 if Is_Global
(Entity
(Parent
(N2
))) then
13185 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13186 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
13187 Set_Global_Type
(Parent
(N
), Parent
(N2
));
13188 Save_Entity_Descendants
(N
);
13190 -- If this is a reference to the current generic entity, replace
13191 -- by the name of the generic homonym of the current package. This
13192 -- is because in an instantiation Par.P.Q will not resolve to the
13193 -- name of the instance, whose enclosing scope is not necessarily
13194 -- Par. We use the generic homonym rather that the name of the
13195 -- generic itself because it may be hidden by a local declaration.
13197 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
13199 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
13201 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
13202 Rewrite
(Parent
(N
),
13203 Make_Identifier
(Sloc
(N
),
13205 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
13207 Rewrite
(Parent
(N
),
13208 Make_Identifier
(Sloc
(N
),
13209 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
13213 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
13214 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
13216 Save_Global_Defaults
13217 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
13220 -- A selected component may denote a static constant that has been
13221 -- folded. If the static constant is global to the generic, capture
13222 -- its value. Otherwise the folding will happen in any instantiation.
13224 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13225 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
13227 if Present
(Entity
(Original_Node
(Parent
(N2
))))
13228 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
13230 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
13231 Set_Analyzed
(Parent
(N
), False);
13237 -- A selected component may be transformed into a parameterless
13238 -- function call. If the called entity is global, rewrite the node
13239 -- appropriately, i.e. as an extended name for the global entity.
13241 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13242 and then Nkind
(Parent
(N2
)) = N_Function_Call
13243 and then N
= Selector_Name
(Parent
(N
))
13245 if No
(Parameter_Associations
(Parent
(N2
))) then
13246 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
13247 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13248 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
13249 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
13250 Save_Entity_Descendants
(N
);
13253 Set_Is_Prefixed_Call
(Parent
(N
));
13254 Set_Associated_Node
(N
, Empty
);
13255 Set_Etype
(N
, Empty
);
13258 -- In Ada 2005, X.F may be a call to a primitive operation,
13259 -- rewritten as F (X). This rewriting will be done again in an
13260 -- instance, so keep the original node. Global entities will be
13261 -- captured as for other constructs. Indicate that this must
13262 -- resolve as a call, to prevent accidental overloading in the
13263 -- instance, if both a component and a primitive operation appear
13267 Set_Is_Prefixed_Call
(Parent
(N
));
13270 -- Entity is local. Reset in generic unit, so that node is resolved
13271 -- anew at the point of instantiation.
13274 Set_Associated_Node
(N
, Empty
);
13275 Set_Etype
(N
, Empty
);
13279 -----------------------------
13280 -- Save_Entity_Descendants --
13281 -----------------------------
13283 procedure Save_Entity_Descendants
(N
: Node_Id
) is
13286 when N_Binary_Op
=>
13287 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
13288 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13291 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13293 when N_Expanded_Name | N_Selected_Component
=>
13294 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
13295 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
13297 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
13301 raise Program_Error
;
13303 end Save_Entity_Descendants
;
13305 --------------------------
13306 -- Save_Global_Defaults --
13307 --------------------------
13309 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
13310 Loc
: constant Source_Ptr
:= Sloc
(N1
);
13311 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
13312 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
13319 Actual
: Entity_Id
;
13322 Assoc1
:= Generic_Associations
(N1
);
13324 if Present
(Assoc1
) then
13325 Act1
:= First
(Assoc1
);
13328 Set_Generic_Associations
(N1
, New_List
);
13329 Assoc1
:= Generic_Associations
(N1
);
13332 if Present
(Assoc2
) then
13333 Act2
:= First
(Assoc2
);
13338 while Present
(Act1
) and then Present
(Act2
) loop
13343 -- Find the associations added for default subprograms
13345 if Present
(Act2
) then
13346 while Nkind
(Act2
) /= N_Generic_Association
13347 or else No
(Entity
(Selector_Name
(Act2
)))
13348 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
13353 -- Add a similar association if the default is global. The
13354 -- renaming declaration for the actual has been analyzed, and
13355 -- its alias is the program it renames. Link the actual in the
13356 -- original generic tree with the node in the analyzed tree.
13358 while Present
(Act2
) loop
13359 Subp
:= Entity
(Selector_Name
(Act2
));
13360 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
13362 -- Following test is defence against rubbish errors
13364 if No
(Alias
(Subp
)) then
13368 -- Retrieve the resolved actual from the renaming declaration
13369 -- created for the instantiated formal.
13371 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
13372 Set_Entity
(Def
, Actual
);
13373 Set_Etype
(Def
, Etype
(Actual
));
13375 if Is_Global
(Actual
) then
13377 Make_Generic_Association
(Loc
,
13378 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13379 Explicit_Generic_Actual_Parameter
=>
13380 New_Occurrence_Of
(Actual
, Loc
));
13382 Set_Associated_Node
13383 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
13385 Append
(Ndec
, Assoc1
);
13387 -- If there are other defaults, add a dummy association in case
13388 -- there are other defaulted formals with the same name.
13390 elsif Present
(Next
(Act2
)) then
13392 Make_Generic_Association
(Loc
,
13393 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13394 Explicit_Generic_Actual_Parameter
=> Empty
);
13396 Append
(Ndec
, Assoc1
);
13403 if Nkind
(Name
(N1
)) = N_Identifier
13404 and then Is_Child_Unit
(Gen_Id
)
13405 and then Is_Global
(Gen_Id
)
13406 and then Is_Generic_Unit
(Scope
(Gen_Id
))
13407 and then In_Open_Scopes
(Scope
(Gen_Id
))
13409 -- This is an instantiation of a child unit within a sibling, so
13410 -- that the generic parent is in scope. An eventual instance must
13411 -- occur within the scope of an instance of the parent. Make name
13412 -- in instance into an expanded name, to preserve the identifier
13413 -- of the parent, so it can be resolved subsequently.
13415 Rewrite
(Name
(N2
),
13416 Make_Expanded_Name
(Loc
,
13417 Chars
=> Chars
(Gen_Id
),
13418 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13419 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13420 Set_Entity
(Name
(N2
), Gen_Id
);
13422 Rewrite
(Name
(N1
),
13423 Make_Expanded_Name
(Loc
,
13424 Chars
=> Chars
(Gen_Id
),
13425 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13426 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13428 Set_Associated_Node
(Name
(N1
), Name
(N2
));
13429 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
13430 Set_Associated_Node
13431 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
13432 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
13435 end Save_Global_Defaults
;
13437 ----------------------------
13438 -- Save_Global_Descendant --
13439 ----------------------------
13441 procedure Save_Global_Descendant
(D
: Union_Id
) is
13445 if D
in Node_Range
then
13446 if D
= Union_Id
(Empty
) then
13449 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
13450 Save_References
(Node_Id
(D
));
13453 elsif D
in List_Range
then
13454 if D
= Union_Id
(No_List
)
13455 or else Is_Empty_List
(List_Id
(D
))
13460 N1
:= First
(List_Id
(D
));
13461 while Present
(N1
) loop
13462 Save_References
(N1
);
13467 -- Element list or other non-node field, nothing to do
13472 end Save_Global_Descendant
;
13474 ---------------------
13475 -- Save_References --
13476 ---------------------
13478 -- This is the recursive procedure that does the work once the enclosing
13479 -- generic scope has been established. We have to treat specially a
13480 -- number of node rewritings that are required by semantic processing
13481 -- and which change the kind of nodes in the generic copy: typically
13482 -- constant-folding, replacing an operator node by a string literal, or
13483 -- a selected component by an expanded name. In each of those cases, the
13484 -- transformation is propagated to the generic unit.
13486 procedure Save_References
(N
: Node_Id
) is
13487 Loc
: constant Source_Ptr
:= Sloc
(N
);
13493 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
13494 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
13497 elsif Nkind
(N
) = N_Operator_Symbol
13498 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
13500 Change_Operator_Symbol_To_String_Literal
(N
);
13503 elsif Nkind
(N
) in N_Op
then
13504 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
13505 if Nkind
(N
) = N_Op_Concat
then
13506 Set_Is_Component_Left_Opnd
(N
,
13507 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
13509 Set_Is_Component_Right_Opnd
(N
,
13510 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
13516 -- Node may be transformed into call to a user-defined operator
13518 N2
:= Get_Associated_Node
(N
);
13520 if Nkind
(N2
) = N_Function_Call
then
13521 E
:= Entity
(Name
(N2
));
13524 and then Is_Global
(E
)
13526 Set_Etype
(N
, Etype
(N2
));
13528 Set_Associated_Node
(N
, Empty
);
13529 Set_Etype
(N
, Empty
);
13532 elsif Nkind_In
(N2
, N_Integer_Literal
,
13536 if Present
(Original_Node
(N2
))
13537 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
13540 -- Operation was constant-folded. Whenever possible,
13541 -- recover semantic information from unfolded node,
13544 Set_Associated_Node
(N
, Original_Node
(N2
));
13546 if Nkind
(N
) = N_Op_Concat
then
13547 Set_Is_Component_Left_Opnd
(N
,
13548 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
13549 Set_Is_Component_Right_Opnd
(N
,
13550 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
13556 -- If original node is already modified, propagate
13557 -- constant-folding to template.
13559 Rewrite
(N
, New_Copy
(N2
));
13560 Set_Analyzed
(N
, False);
13563 elsif Nkind
(N2
) = N_Identifier
13564 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
13566 -- Same if call was folded into a literal, but in this case
13567 -- retain the entity to avoid spurious ambiguities if it is
13568 -- overloaded at the point of instantiation or inlining.
13570 Rewrite
(N
, New_Copy
(N2
));
13571 Set_Analyzed
(N
, False);
13575 -- Complete operands check if node has not been constant-folded
13577 if Nkind
(N
) in N_Op
then
13578 Save_Entity_Descendants
(N
);
13581 elsif Nkind
(N
) = N_Identifier
then
13582 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
13584 -- If this is a discriminant reference, always save it. It is
13585 -- used in the instance to find the corresponding discriminant
13586 -- positionally rather than by name.
13588 Set_Original_Discriminant
13589 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
13593 N2
:= Get_Associated_Node
(N
);
13595 if Nkind
(N2
) = N_Function_Call
then
13596 E
:= Entity
(Name
(N2
));
13598 -- Name resolves to a call to parameterless function. If
13599 -- original entity is global, mark node as resolved.
13602 and then Is_Global
(E
)
13604 Set_Etype
(N
, Etype
(N2
));
13606 Set_Associated_Node
(N
, Empty
);
13607 Set_Etype
(N
, Empty
);
13610 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
13611 and then Is_Entity_Name
(Original_Node
(N2
))
13613 -- Name resolves to named number that is constant-folded,
13614 -- We must preserve the original name for ASIS use, and
13615 -- undo the constant-folding, which will be repeated in
13618 Set_Associated_Node
(N
, Original_Node
(N2
));
13621 elsif Nkind
(N2
) = N_String_Literal
then
13623 -- Name resolves to string literal. Perform the same
13624 -- replacement in generic.
13626 Rewrite
(N
, New_Copy
(N2
));
13628 elsif Nkind
(N2
) = N_Explicit_Dereference
then
13630 -- An identifier is rewritten as a dereference if it is the
13631 -- prefix in an implicit dereference (call or attribute).
13632 -- The analysis of an instantiation will expand the node
13633 -- again, so we preserve the original tree but link it to
13634 -- the resolved entity in case it is global.
13636 if Is_Entity_Name
(Prefix
(N2
))
13637 and then Present
(Entity
(Prefix
(N2
)))
13638 and then Is_Global
(Entity
(Prefix
(N2
)))
13640 Set_Associated_Node
(N
, Prefix
(N2
));
13642 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
13643 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
13646 Make_Explicit_Dereference
(Loc
,
13647 Prefix
=> Make_Function_Call
(Loc
,
13649 New_Occurrence_Of
(Entity
(Name
(Prefix
(N2
))),
13653 Set_Associated_Node
(N
, Empty
);
13654 Set_Etype
(N
, Empty
);
13657 -- The subtype mark of a nominally unconstrained object is
13658 -- rewritten as a subtype indication using the bounds of the
13659 -- expression. Recover the original subtype mark.
13661 elsif Nkind
(N2
) = N_Subtype_Indication
13662 and then Is_Entity_Name
(Original_Node
(N2
))
13664 Set_Associated_Node
(N
, Original_Node
(N2
));
13672 elsif Nkind
(N
) in N_Entity
then
13677 Qual
: Node_Id
:= Empty
;
13678 Typ
: Entity_Id
:= Empty
;
13681 use Atree
.Unchecked_Access
;
13682 -- This code section is part of implementing an untyped tree
13683 -- traversal, so it needs direct access to node fields.
13686 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
13687 N2
:= Get_Associated_Node
(N
);
13694 -- In an instance within a generic, use the name of the
13695 -- actual and not the original generic parameter. If the
13696 -- actual is global in the current generic it must be
13697 -- preserved for its instantiation.
13699 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
13701 Present
(Generic_Parent_Type
(Parent
(Typ
)))
13703 Typ
:= Base_Type
(Typ
);
13704 Set_Etype
(N2
, Typ
);
13710 or else not Is_Global
(Typ
)
13712 Set_Associated_Node
(N
, Empty
);
13714 -- If the aggregate is an actual in a call, it has been
13715 -- resolved in the current context, to some local type.
13716 -- The enclosing call may have been disambiguated by the
13717 -- aggregate, and this disambiguation might fail at
13718 -- instantiation time because the type to which the
13719 -- aggregate did resolve is not preserved. In order to
13720 -- preserve some of this information, we wrap the
13721 -- aggregate in a qualified expression, using the id of
13722 -- its type. For further disambiguation we qualify the
13723 -- type name with its scope (if visible) because both
13724 -- id's will have corresponding entities in an instance.
13725 -- This resolves most of the problems with missing type
13726 -- information on aggregates in instances.
13728 if Nkind
(N2
) = Nkind
(N
)
13729 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
13730 and then Comes_From_Source
(Typ
)
13732 if Is_Immediately_Visible
(Scope
(Typ
)) then
13733 Nam
:= Make_Selected_Component
(Loc
,
13735 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
13737 Make_Identifier
(Loc
, Chars
(Typ
)));
13739 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
13743 Make_Qualified_Expression
(Loc
,
13744 Subtype_Mark
=> Nam
,
13745 Expression
=> Relocate_Node
(N
));
13749 Save_Global_Descendant
(Field1
(N
));
13750 Save_Global_Descendant
(Field2
(N
));
13751 Save_Global_Descendant
(Field3
(N
));
13752 Save_Global_Descendant
(Field5
(N
));
13754 if Present
(Qual
) then
13758 -- All other cases than aggregates
13761 Save_Global_Descendant
(Field1
(N
));
13762 Save_Global_Descendant
(Field2
(N
));
13763 Save_Global_Descendant
(Field3
(N
));
13764 Save_Global_Descendant
(Field4
(N
));
13765 Save_Global_Descendant
(Field5
(N
));
13770 -- If a node has aspects, references within their expressions must
13771 -- be saved separately, given they are not directly in the tree.
13773 if Has_Aspects
(N
) then
13778 Aspect
:= First
(Aspect_Specifications
(N
));
13779 while Present
(Aspect
) loop
13780 if Present
(Expression
(Aspect
)) then
13781 Save_Global_References
(Expression
(Aspect
));
13788 end Save_References
;
13790 -- Start of processing for Save_Global_References
13793 Gen_Scope
:= Current_Scope
;
13795 -- If the generic unit is a child unit, references to entities in the
13796 -- parent are treated as local, because they will be resolved anew in
13797 -- the context of the instance of the parent.
13799 while Is_Child_Unit
(Gen_Scope
)
13800 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
13802 Gen_Scope
:= Scope
(Gen_Scope
);
13805 Save_References
(N
);
13806 end Save_Global_References
;
13808 --------------------------------------
13809 -- Set_Copied_Sloc_For_Inlined_Body --
13810 --------------------------------------
13812 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
13814 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
13815 end Set_Copied_Sloc_For_Inlined_Body
;
13817 ---------------------
13818 -- Set_Instance_Of --
13819 ---------------------
13821 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
13823 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
13824 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
13825 Generic_Renamings
.Increment_Last
;
13826 end Set_Instance_Of
;
13828 --------------------
13829 -- Set_Next_Assoc --
13830 --------------------
13832 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
13834 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
13835 end Set_Next_Assoc
;
13837 -------------------
13838 -- Start_Generic --
13839 -------------------
13841 procedure Start_Generic
is
13843 -- ??? More things could be factored out in this routine.
13844 -- Should probably be done at a later stage.
13846 Generic_Flags
.Append
(Inside_A_Generic
);
13847 Inside_A_Generic
:= True;
13849 Expander_Mode_Save_And_Set
(False);
13852 ----------------------
13853 -- Set_Instance_Env --
13854 ----------------------
13856 procedure Set_Instance_Env
13857 (Gen_Unit
: Entity_Id
;
13858 Act_Unit
: Entity_Id
)
13860 Assertion_Status
: constant Boolean := Assertions_Enabled
;
13861 Save_SPARK_Mode
: constant SPARK_Mode_Type
:= SPARK_Mode
;
13862 Save_SPARK_Mode_Pragma
: constant Node_Id
:= SPARK_Mode_Pragma
;
13865 -- Regardless of the current mode, predefined units are analyzed in the
13866 -- most current Ada mode, and earlier version Ada checks do not apply
13867 -- to predefined units. Nothing needs to be done for non-internal units.
13868 -- These are always analyzed in the current mode.
13870 if Is_Internal_File_Name
13871 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
13872 Renamings_Included
=> True)
13874 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
13876 -- In Ada2012 we may want to enable assertions in an instance of a
13877 -- predefined unit, in which case we need to preserve the current
13878 -- setting for the Assertions_Enabled flag. This will become more
13879 -- critical when pre/postconditions are added to predefined units,
13880 -- as is already the case for some numeric libraries.
13882 if Ada_Version
>= Ada_2012
then
13883 Assertions_Enabled
:= Assertion_Status
;
13886 -- SPARK_Mode for an instance is the one applicable at the point of
13889 SPARK_Mode
:= Save_SPARK_Mode
;
13890 SPARK_Mode_Pragma
:= Save_SPARK_Mode_Pragma
;
13893 Current_Instantiated_Parent
:=
13894 (Gen_Id
=> Gen_Unit
,
13895 Act_Id
=> Act_Unit
,
13896 Next_In_HTable
=> Assoc_Null
);
13897 end Set_Instance_Env
;
13903 procedure Switch_View
(T
: Entity_Id
) is
13904 BT
: constant Entity_Id
:= Base_Type
(T
);
13905 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
13906 Priv_Sub
: Entity_Id
;
13909 -- T may be private but its base type may have been exchanged through
13910 -- some other occurrence, in which case there is nothing to switch
13911 -- besides T itself. Note that a private dependent subtype of a private
13912 -- type might not have been switched even if the base type has been,
13913 -- because of the last branch of Check_Private_View (see comment there).
13915 if not Is_Private_Type
(BT
) then
13916 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
13917 Exchange_Declarations
(T
);
13921 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
13923 if Present
(Full_View
(BT
)) then
13924 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
13925 Exchange_Declarations
(BT
);
13928 while Present
(Priv_Elmt
) loop
13929 Priv_Sub
:= (Node
(Priv_Elmt
));
13931 -- We avoid flipping the subtype if the Etype of its full view is
13932 -- private because this would result in a malformed subtype. This
13933 -- occurs when the Etype of the subtype full view is the full view of
13934 -- the base type (and since the base types were just switched, the
13935 -- subtype is pointing to the wrong view). This is currently the case
13936 -- for tagged record types, access types (maybe more?) and needs to
13937 -- be resolved. ???
13939 if Present
(Full_View
(Priv_Sub
))
13940 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
13942 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
13943 Exchange_Declarations
(Priv_Sub
);
13946 Next_Elmt
(Priv_Elmt
);
13954 function True_Parent
(N
: Node_Id
) return Node_Id
is
13956 if Nkind
(Parent
(N
)) = N_Subunit
then
13957 return Parent
(Corresponding_Stub
(Parent
(N
)));
13963 -----------------------------
13964 -- Valid_Default_Attribute --
13965 -----------------------------
13967 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
13968 Attr_Id
: constant Attribute_Id
:=
13969 Get_Attribute_Id
(Attribute_Name
(Def
));
13970 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
13971 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
13984 F
:= First_Formal
(Nam
);
13985 while Present
(F
) loop
13986 Num_F
:= Num_F
+ 1;
13991 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
13992 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
13993 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
13994 Attribute_Unbiased_Rounding
=>
13997 and then Is_Floating_Point_Type
(T
);
13999 when Attribute_Image | Attribute_Pred | Attribute_Succ |
14000 Attribute_Value | Attribute_Wide_Image |
14001 Attribute_Wide_Value
=>
14002 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
14004 when Attribute_Max | Attribute_Min
=>
14005 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
14007 when Attribute_Input
=>
14008 OK
:= (Is_Fun
and then Num_F
= 1);
14010 when Attribute_Output | Attribute_Read | Attribute_Write
=>
14011 OK
:= (not Is_Fun
and then Num_F
= 2);
14018 Error_Msg_N
("attribute reference has wrong profile for subprogram",
14021 end Valid_Default_Attribute
;