1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, 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 Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Expander
; use Expander
;
32 with Exp_Disp
; use Exp_Disp
;
33 with Exp_Util
; use Exp_Util
;
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 function Build_Function_Wrapper
959 Actual
: Entity_Id
:= Empty
) return Node_Id
;
960 -- In GNATprove mode, create a wrapper function for actuals that are
961 -- functions with any number of formal parameters, in order to propagate
962 -- their contract to the renaming declarations generated for them.
963 -- If the actual is absent, the formal has a default, and the name of
964 -- the function is that of the formal.
966 function Build_Operator_Wrapper
968 Actual
: Entity_Id
:= Empty
) return Node_Id
;
969 -- In GNATprove mode, create a wrapper function for actuals that are
970 -- operators, in order to propagate their contract to the renaming
971 -- declarations generated for them. If the actual is absent, this is
972 -- a formal with a default, and the name of the operator is that of the
975 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
);
976 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
977 -- cannot have a named association for it. AI05-0025 extends this rule
978 -- to formals of formal packages by AI05-0025, and it also applies to
979 -- box-initialized formals.
981 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
982 -- Determine whether the parameter types and the return type of Subp
983 -- are fully defined at the point of instantiation.
985 function Matching_Actual
987 A_F
: Entity_Id
) return Node_Id
;
988 -- Find actual that corresponds to a given a formal parameter. If the
989 -- actuals are positional, return the next one, if any. If the actuals
990 -- are named, scan the parameter associations to find the right one.
991 -- A_F is the corresponding entity in the analyzed generic,which is
992 -- placed on the selector name for ASIS use.
994 -- In Ada 2005, a named association may be given with a box, in which
995 -- case Matching_Actual sets Found_Assoc to the generic association,
996 -- but return Empty for the actual itself. In this case the code below
997 -- creates a corresponding declaration for the formal.
999 function Partial_Parameterization
return Boolean;
1000 -- Ada 2005: if no match is found for a given formal, check if the
1001 -- association for it includes a box, or whether the associations
1002 -- include an Others clause.
1004 procedure Process_Default
(F
: Entity_Id
);
1005 -- Add a copy of the declaration of generic formal F to the list of
1006 -- associations, and add an explicit box association for F if there
1007 -- is none yet, and the default comes from an Others_Choice.
1009 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1010 -- Determine whether Subp renames one of the subprograms defined in the
1011 -- generated package Standard.
1013 procedure Set_Analyzed_Formal
;
1014 -- Find the node in the generic copy that corresponds to a given formal.
1015 -- The semantic information on this node is used to perform legality
1016 -- checks on the actuals. Because semantic analysis can introduce some
1017 -- anonymous entities or modify the declaration node itself, the
1018 -- correspondence between the two lists is not one-one. In addition to
1019 -- anonymous types, the presence a formal equality will introduce an
1020 -- implicit declaration for the corresponding inequality.
1022 ----------------------------
1023 -- Build_Function_Wrapper --
1024 ----------------------------
1026 function Build_Function_Wrapper
1027 (Formal
: Entity_Id
;
1028 Actual
: Entity_Id
:= Empty
) return Node_Id
1030 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1033 Func_Name
: Node_Id
;
1035 Parm_Type
: Node_Id
;
1036 Profile
: List_Id
:= New_List
;
1043 -- If there is no actual, the formal has a default and is retrieved
1044 -- by name. Otherwise the wrapper encloses a call to the actual.
1047 Func_Name
:= Make_Identifier
(Loc
, Chars
(Formal
));
1049 Func_Name
:= New_Occurrence_Of
(Entity
(Actual
), Loc
);
1052 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal
));
1053 Set_Ekind
(Func
, E_Function
);
1054 Set_Is_Generic_Actual_Subprogram
(Func
);
1056 Actuals
:= New_List
;
1057 Profile
:= New_List
;
1059 if Present
(Actual
) then
1060 Act_F
:= First_Formal
(Entity
(Actual
));
1065 Form_F
:= First_Formal
(Formal
);
1066 while Present
(Form_F
) loop
1068 -- Create new formal for profile of wrapper, and add a reference
1069 -- to it in the list of actuals for the enclosing call. The name
1070 -- must be that of the formal in the formal subprogram, because
1071 -- calls to it in the generic body may use named associations.
1073 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
1077 -- If formal has a class-wide type rewrite as the corresponding
1078 -- attribute, because the class-wide type is not retrievable by
1081 if Is_Class_Wide_Type
(Etype
(Form_F
)) then
1083 Make_Attribute_Reference
(Loc
,
1084 Attribute_Name
=> Name_Class
,
1086 Make_Identifier
(Loc
, Chars
(Etype
(Etype
(Form_F
)))));
1090 Make_Identifier
(Loc
, Chars
(Etype
(Etype
(Form_F
))));
1093 -- If actual is present, use the type of its own formal
1096 Parm_Type
:= New_Occurrence_Of
(Etype
(Act_F
), Loc
);
1100 Make_Parameter_Specification
(Loc
,
1101 Defining_Identifier
=> New_F
,
1102 Parameter_Type
=> Parm_Type
));
1104 Append_To
(Actuals
, New_Occurrence_Of
(New_F
, Loc
));
1105 Next_Formal
(Form_F
);
1107 if Present
(Act_F
) then
1108 Next_Formal
(Act_F
);
1113 Make_Function_Specification
(Loc
,
1114 Defining_Unit_Name
=> Func
,
1115 Parameter_Specifications
=> Profile
,
1116 Result_Definition
=>
1117 Make_Identifier
(Loc
, Chars
(Etype
(Formal
))));
1120 Make_Expression_Function
(Loc
,
1121 Specification
=> Spec
,
1123 Make_Function_Call
(Loc
,
1125 Parameter_Associations
=> Actuals
));
1128 end Build_Function_Wrapper
;
1130 ----------------------------
1131 -- Build_Operator_Wrapper --
1132 ----------------------------
1134 function Build_Operator_Wrapper
1135 (Formal
: Entity_Id
;
1136 Actual
: Entity_Id
:= Empty
) return Node_Id
1138 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1139 Typ
: constant Entity_Id
:= Etype
(Formal
);
1140 Is_Binary
: constant Boolean :=
1141 Present
(Next_Formal
(First_Formal
(Formal
)));
1153 Op_Name
:= Chars
(Formal
);
1155 Op_Name
:= Chars
(Actual
);
1158 -- Create entities for wrapper function and its formals
1160 F1
:= Make_Temporary
(Loc
, 'A');
1161 F2
:= Make_Temporary
(Loc
, 'B');
1162 L
:= New_Occurrence_Of
(F1
, Loc
);
1163 R
:= New_Occurrence_Of
(F2
, Loc
);
1165 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal
));
1166 Set_Ekind
(Func
, E_Function
);
1167 Set_Is_Generic_Actual_Subprogram
(Func
);
1170 Make_Function_Specification
(Loc
,
1171 Defining_Unit_Name
=> Func
,
1172 Parameter_Specifications
=> New_List
(
1173 Make_Parameter_Specification
(Loc
,
1174 Defining_Identifier
=> F1
,
1176 Make_Identifier
(Loc
,
1177 Chars
=> Chars
(Etype
(First_Formal
(Formal
)))))),
1178 Result_Definition
=> Make_Identifier
(Loc
, Chars
(Typ
)));
1181 Append_To
(Parameter_Specifications
(Spec
),
1182 Make_Parameter_Specification
(Loc
,
1183 Defining_Identifier
=> F2
,
1185 Make_Identifier
(Loc
,
1186 Chars
(Etype
(Next_Formal
(First_Formal
(Formal
)))))));
1189 -- Build expression as a function call, or as an operator node
1190 -- that corresponds to the name of the actual, starting with binary
1193 if Present
(Actual
) and then Op_Name
not in Any_Operator_Name
then
1195 Make_Function_Call
(Loc
,
1197 New_Occurrence_Of
(Entity
(Actual
), Loc
),
1198 Parameter_Associations
=> New_List
(L
));
1201 Append_To
(Parameter_Associations
(Expr
), R
);
1206 elsif Is_Binary
then
1207 if Op_Name
= Name_Op_And
then
1208 Expr
:= Make_Op_And
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1209 elsif Op_Name
= Name_Op_Or
then
1210 Expr
:= Make_Op_Or
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1211 elsif Op_Name
= Name_Op_Xor
then
1212 Expr
:= Make_Op_Xor
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1213 elsif Op_Name
= Name_Op_Eq
then
1214 Expr
:= Make_Op_Eq
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1215 elsif Op_Name
= Name_Op_Ne
then
1216 Expr
:= Make_Op_Ne
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1217 elsif Op_Name
= Name_Op_Le
then
1218 Expr
:= Make_Op_Le
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1219 elsif Op_Name
= Name_Op_Gt
then
1220 Expr
:= Make_Op_Gt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1221 elsif Op_Name
= Name_Op_Ge
then
1222 Expr
:= Make_Op_Ge
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1223 elsif Op_Name
= Name_Op_Lt
then
1224 Expr
:= Make_Op_Lt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1225 elsif Op_Name
= Name_Op_Add
then
1226 Expr
:= Make_Op_Add
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1227 elsif Op_Name
= Name_Op_Subtract
then
1228 Expr
:= Make_Op_Subtract
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1229 elsif Op_Name
= Name_Op_Concat
then
1230 Expr
:= Make_Op_Concat
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1231 elsif Op_Name
= Name_Op_Multiply
then
1232 Expr
:= Make_Op_Multiply
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1233 elsif Op_Name
= Name_Op_Divide
then
1234 Expr
:= Make_Op_Divide
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1235 elsif Op_Name
= Name_Op_Mod
then
1236 Expr
:= Make_Op_Mod
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1237 elsif Op_Name
= Name_Op_Rem
then
1238 Expr
:= Make_Op_Rem
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1239 elsif Op_Name
= Name_Op_Expon
then
1240 Expr
:= Make_Op_Expon
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
1246 if Op_Name
= Name_Op_Add
then
1247 Expr
:= Make_Op_Plus
(Loc
, Right_Opnd
=> L
);
1248 elsif Op_Name
= Name_Op_Subtract
then
1249 Expr
:= Make_Op_Minus
(Loc
, Right_Opnd
=> L
);
1250 elsif Op_Name
= Name_Op_Abs
then
1251 Expr
:= Make_Op_Abs
(Loc
, Right_Opnd
=> L
);
1252 elsif Op_Name
= Name_Op_Not
then
1253 Expr
:= Make_Op_Not
(Loc
, Right_Opnd
=> L
);
1257 -- Propagate visible entity to operator node, either from a
1258 -- given actual or from a default.
1260 if Is_Entity_Name
(Actual
) and then Nkind
(Expr
) in N_Op
then
1261 Set_Entity
(Expr
, Entity
(Actual
));
1265 Make_Expression_Function
(Loc
,
1266 Specification
=> Spec
,
1267 Expression
=> Expr
);
1270 end Build_Operator_Wrapper
;
1272 ----------------------------------------
1273 -- Check_Overloaded_Formal_Subprogram --
1274 ----------------------------------------
1276 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
) is
1277 Temp_Formal
: Entity_Id
;
1280 Temp_Formal
:= First
(Formals
);
1281 while Present
(Temp_Formal
) loop
1282 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1283 and then Temp_Formal
/= Formal
1285 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1286 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1288 if Present
(Found_Assoc
) then
1290 ("named association not allowed for overloaded formal",
1295 ("named association not allowed for overloaded formal",
1299 Abandon_Instantiation
(Instantiation_Node
);
1304 end Check_Overloaded_Formal_Subprogram
;
1306 -------------------------------
1307 -- Has_Fully_Defined_Profile --
1308 -------------------------------
1310 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1311 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1312 -- Determine whethet type Typ is fully defined
1314 ---------------------------
1315 -- Is_Fully_Defined_Type --
1316 ---------------------------
1318 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1320 -- A private type without a full view is not fully defined
1322 if Is_Private_Type
(Typ
)
1323 and then No
(Full_View
(Typ
))
1327 -- An incomplete type is never fully defined
1329 elsif Is_Incomplete_Type
(Typ
) then
1332 -- All other types are fully defined
1337 end Is_Fully_Defined_Type
;
1339 -- Local declarations
1343 -- Start of processing for Has_Fully_Defined_Profile
1346 -- Check the parameters
1348 Param
:= First_Formal
(Subp
);
1349 while Present
(Param
) loop
1350 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1354 Next_Formal
(Param
);
1357 -- Check the return type
1359 return Is_Fully_Defined_Type
(Etype
(Subp
));
1360 end Has_Fully_Defined_Profile
;
1362 ---------------------
1363 -- Matching_Actual --
1364 ---------------------
1366 function Matching_Actual
1368 A_F
: Entity_Id
) return Node_Id
1374 Is_Named_Assoc
:= False;
1376 -- End of list of purely positional parameters
1378 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1379 Found_Assoc
:= Empty
;
1382 -- Case of positional parameter corresponding to current formal
1384 elsif No
(Selector_Name
(Actual
)) then
1385 Found_Assoc
:= Actual
;
1386 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1387 Num_Matched
:= Num_Matched
+ 1;
1390 -- Otherwise scan list of named actuals to find the one with the
1391 -- desired name. All remaining actuals have explicit names.
1394 Is_Named_Assoc
:= True;
1395 Found_Assoc
:= Empty
;
1399 while Present
(Actual
) loop
1400 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1401 Set_Entity
(Selector_Name
(Actual
), A_F
);
1402 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1403 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1404 Found_Assoc
:= Actual
;
1405 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1406 Num_Matched
:= Num_Matched
+ 1;
1414 -- Reset for subsequent searches. In most cases the named
1415 -- associations are in order. If they are not, we reorder them
1416 -- to avoid scanning twice the same actual. This is not just a
1417 -- question of efficiency: there may be multiple defaults with
1418 -- boxes that have the same name. In a nested instantiation we
1419 -- insert actuals for those defaults, and cannot rely on their
1420 -- names to disambiguate them.
1422 if Actual
= First_Named
then
1425 elsif Present
(Actual
) then
1426 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1429 Actual
:= First_Named
;
1432 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1433 Set_Used_As_Generic_Actual
(Entity
(Act
));
1437 end Matching_Actual
;
1439 ------------------------------
1440 -- Partial_Parameterization --
1441 ------------------------------
1443 function Partial_Parameterization
return Boolean is
1445 return Others_Present
1446 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1447 end Partial_Parameterization
;
1449 ---------------------
1450 -- Process_Default --
1451 ---------------------
1453 procedure Process_Default
(F
: Entity_Id
) is
1454 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1455 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1461 -- Append copy of formal declaration to associations, and create new
1462 -- defining identifier for it.
1464 Decl
:= New_Copy_Tree
(F
);
1465 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1467 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1468 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1471 Set_Defining_Identifier
(Decl
, Id
);
1474 Append
(Decl
, Assoc
);
1476 if No
(Found_Assoc
) then
1478 Make_Generic_Association
(Loc
,
1479 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
),
1480 Explicit_Generic_Actual_Parameter
=> Empty
);
1481 Set_Box_Present
(Default
);
1482 Append
(Default
, Default_Formals
);
1484 end Process_Default
;
1486 ---------------------------------
1487 -- Renames_Standard_Subprogram --
1488 ---------------------------------
1490 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1495 while Present
(Id
) loop
1496 if Scope
(Id
) = Standard_Standard
then
1504 end Renames_Standard_Subprogram
;
1506 -------------------------
1507 -- Set_Analyzed_Formal --
1508 -------------------------
1510 procedure Set_Analyzed_Formal
is
1514 while Present
(Analyzed_Formal
) loop
1515 Kind
:= Nkind
(Analyzed_Formal
);
1517 case Nkind
(Formal
) is
1519 when N_Formal_Subprogram_Declaration
=>
1520 exit when Kind
in N_Formal_Subprogram_Declaration
1523 (Defining_Unit_Name
(Specification
(Formal
))) =
1525 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1527 when N_Formal_Package_Declaration
=>
1528 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1529 N_Generic_Package_Declaration
,
1530 N_Package_Declaration
);
1532 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
1536 -- Skip freeze nodes, and nodes inserted to replace
1537 -- unrecognized pragmas.
1540 Kind
not in N_Formal_Subprogram_Declaration
1541 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1545 and then Chars
(Defining_Identifier
(Formal
)) =
1546 Chars
(Defining_Identifier
(Analyzed_Formal
));
1549 Next
(Analyzed_Formal
);
1551 end Set_Analyzed_Formal
;
1553 -- Start of processing for Analyze_Associations
1556 Actuals
:= Generic_Associations
(I_Node
);
1558 if Present
(Actuals
) then
1560 -- Check for an Others choice, indicating a partial parameterization
1561 -- for a formal package.
1563 Actual
:= First
(Actuals
);
1564 while Present
(Actual
) loop
1565 if Nkind
(Actual
) = N_Others_Choice
then
1566 Others_Present
:= True;
1567 Others_Choice
:= Actual
;
1569 if Present
(Next
(Actual
)) then
1570 Error_Msg_N
("others must be last association", Actual
);
1573 -- This subprogram is used both for formal packages and for
1574 -- instantiations. For the latter, associations must all be
1577 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1578 and then Comes_From_Source
(I_Node
)
1581 ("others association not allowed in an instance",
1585 -- In any case, nothing to do after the others association
1589 elsif Box_Present
(Actual
)
1590 and then Comes_From_Source
(I_Node
)
1591 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1594 ("box association not allowed in an instance", Actual
);
1600 -- If named associations are present, save first named association
1601 -- (it may of course be Empty) to facilitate subsequent name search.
1603 First_Named
:= First
(Actuals
);
1604 while Present
(First_Named
)
1605 and then Nkind
(First_Named
) /= N_Others_Choice
1606 and then No
(Selector_Name
(First_Named
))
1608 Num_Actuals
:= Num_Actuals
+ 1;
1613 Named
:= First_Named
;
1614 while Present
(Named
) loop
1615 if Nkind
(Named
) /= N_Others_Choice
1616 and then No
(Selector_Name
(Named
))
1618 Error_Msg_N
("invalid positional actual after named one", Named
);
1619 Abandon_Instantiation
(Named
);
1622 -- A named association may lack an actual parameter, if it was
1623 -- introduced for a default subprogram that turns out to be local
1624 -- to the outer instantiation.
1626 if Nkind
(Named
) /= N_Others_Choice
1627 and then Present
(Explicit_Generic_Actual_Parameter
(Named
))
1629 Num_Actuals
:= Num_Actuals
+ 1;
1635 if Present
(Formals
) then
1636 Formal
:= First_Non_Pragma
(Formals
);
1637 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1639 if Present
(Actuals
) then
1640 Actual
:= First
(Actuals
);
1642 -- All formals should have default values
1648 while Present
(Formal
) loop
1649 Set_Analyzed_Formal
;
1650 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1652 case Nkind
(Formal
) is
1653 when N_Formal_Object_Declaration
=>
1656 Defining_Identifier
(Formal
),
1657 Defining_Identifier
(Analyzed_Formal
));
1659 if No
(Match
) and then Partial_Parameterization
then
1660 Process_Default
(Formal
);
1663 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1667 -- If the object is a call to an expression function, this
1668 -- is a freezing point for it.
1670 if Is_Entity_Name
(Match
)
1671 and then Present
(Entity
(Match
))
1673 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1674 = N_Expression_Function
1676 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1679 when N_Formal_Type_Declaration
=>
1682 Defining_Identifier
(Formal
),
1683 Defining_Identifier
(Analyzed_Formal
));
1686 if Partial_Parameterization
then
1687 Process_Default
(Formal
);
1690 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1694 Defining_Identifier
(Formal
));
1695 Error_Msg_NE
("\in instantiation of & declared#",
1696 Instantiation_Node
, Gen_Unit
);
1697 Abandon_Instantiation
(Instantiation_Node
);
1704 (Formal
, Match
, Analyzed_Formal
, Assoc
),
1707 -- An instantiation is a freeze point for the actuals,
1708 -- unless this is a rewritten formal package, or the
1709 -- formal is an Ada 2012 formal incomplete type.
1711 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1713 (Ada_Version
>= Ada_2012
1715 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1721 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1725 -- A remote access-to-class-wide type is not a legal actual
1726 -- for a generic formal of an access type (E.2.2(17/2)).
1727 -- In GNAT an exception to this rule is introduced when
1728 -- the formal is marked as remote using implementation
1729 -- defined aspect/pragma Remote_Access_Type. In that case
1730 -- the actual must be remote as well.
1732 -- If the current instantiation is the construction of a
1733 -- local copy for a formal package the actuals may be
1734 -- defaulted, and there is no matching actual to check.
1736 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1738 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1739 N_Access_To_Object_Definition
1740 and then Present
(Match
)
1743 Formal_Ent
: constant Entity_Id
:=
1744 Defining_Identifier
(Analyzed_Formal
);
1746 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1747 = Is_Remote_Types
(Formal_Ent
)
1749 -- Remoteness of formal and actual match
1753 elsif Is_Remote_Types
(Formal_Ent
) then
1755 -- Remote formal, non-remote actual
1758 ("actual for& must be remote", Match
, Formal_Ent
);
1761 -- Non-remote formal, remote actual
1764 ("actual for& may not be remote",
1770 when N_Formal_Subprogram_Declaration
=>
1773 (Defining_Unit_Name
(Specification
(Formal
)),
1774 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1776 -- If the formal subprogram has the same name as another
1777 -- formal subprogram of the generic, then a named
1778 -- association is illegal (12.3(9)). Exclude named
1779 -- associations that are generated for a nested instance.
1782 and then Is_Named_Assoc
1783 and then Comes_From_Source
(Found_Assoc
)
1785 Check_Overloaded_Formal_Subprogram
(Formal
);
1788 -- If there is no corresponding actual, this may be case
1789 -- of partial parameterization, or else the formal has a
1790 -- default or a box.
1792 if No
(Match
) and then Partial_Parameterization
then
1793 Process_Default
(Formal
);
1795 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1796 Check_Overloaded_Formal_Subprogram
(Formal
);
1802 (Containing_Package_With_Ext_Axioms
1803 (Defining_Entity
(Analyzed_Formal
)))
1804 and then Ekind
(Defining_Entity
(Analyzed_Formal
)) =
1807 -- If actual is an entity (function or operator),
1808 -- build wrapper for it.
1810 if Present
(Match
) then
1811 if Nkind
(Match
) = N_Operator_Symbol
then
1813 -- If the name is a default, find its visible
1814 -- entity at the point of instantiation.
1816 if Is_Entity_Name
(Match
)
1817 and then No
(Entity
(Match
))
1819 Find_Direct_Name
(Match
);
1824 Build_Operator_Wrapper
1825 (Defining_Entity
(Analyzed_Formal
), Match
));
1829 Build_Function_Wrapper
1830 (Defining_Entity
(Analyzed_Formal
), Match
));
1833 -- Ditto if formal is an operator with a default.
1835 elsif Box_Present
(Formal
)
1836 and then Nkind
(Defining_Entity
(Analyzed_Formal
)) =
1837 N_Defining_Operator_Symbol
1840 Build_Operator_Wrapper
1841 (Defining_Entity
(Analyzed_Formal
)));
1843 -- Otherwise create renaming declaration.
1847 Build_Function_Wrapper
1848 (Defining_Entity
(Analyzed_Formal
)));
1853 Instantiate_Formal_Subprogram
1854 (Formal
, Match
, Analyzed_Formal
));
1857 -- An instantiation is a freeze point for the actuals,
1858 -- unless this is a rewritten formal package.
1860 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1861 and then Nkind
(Match
) = N_Identifier
1862 and then Is_Subprogram
(Entity
(Match
))
1864 -- The actual subprogram may rename a routine defined
1865 -- in Standard. Avoid freezing such renamings because
1866 -- subprograms coming from Standard cannot be frozen.
1869 not Renames_Standard_Subprogram
(Entity
(Match
))
1871 -- If the actual subprogram comes from a different
1872 -- unit, it is already frozen, either by a body in
1873 -- that unit or by the end of the declarative part
1874 -- of the unit. This check avoids the freezing of
1875 -- subprograms defined in Standard which are used
1876 -- as generic actuals.
1878 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1879 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1881 -- Mark the subprogram as having a delayed freeze
1882 -- since this may be an out-of-order action.
1884 Set_Has_Delayed_Freeze
(Entity
(Match
));
1885 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1889 -- If this is a nested generic, preserve default for later
1892 if No
(Match
) and then Box_Present
(Formal
) then
1894 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1898 when N_Formal_Package_Declaration
=>
1901 Defining_Identifier
(Formal
),
1902 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1905 if Partial_Parameterization
then
1906 Process_Default
(Formal
);
1909 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1912 Instantiation_Node
, Defining_Identifier
(Formal
));
1913 Error_Msg_NE
("\in instantiation of & declared#",
1914 Instantiation_Node
, Gen_Unit
);
1916 Abandon_Instantiation
(Instantiation_Node
);
1922 (Instantiate_Formal_Package
1923 (Formal
, Match
, Analyzed_Formal
),
1927 -- For use type and use package appearing in the generic part,
1928 -- we have already copied them, so we can just move them where
1929 -- they belong (we mustn't recopy them since this would mess up
1930 -- the Sloc values).
1932 when N_Use_Package_Clause |
1933 N_Use_Type_Clause
=>
1934 if Nkind
(Original_Node
(I_Node
)) =
1935 N_Formal_Package_Declaration
1937 Append
(New_Copy_Tree
(Formal
), Assoc
);
1940 Append
(Formal
, Assoc
);
1944 raise Program_Error
;
1948 Formal
:= Saved_Formal
;
1949 Next_Non_Pragma
(Analyzed_Formal
);
1952 if Num_Actuals
> Num_Matched
then
1953 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1955 if Present
(Selector_Name
(Actual
)) then
1957 ("unmatched actual&",
1958 Actual
, Selector_Name
(Actual
));
1959 Error_Msg_NE
("\in instantiation of& declared#",
1963 ("unmatched actual in instantiation of& declared#",
1968 elsif Present
(Actuals
) then
1970 ("too many actuals in generic instantiation", Instantiation_Node
);
1973 -- An instantiation freezes all generic actuals. The only exceptions
1974 -- to this are incomplete types and subprograms which are not fully
1975 -- defined at the point of instantiation.
1978 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
1980 while Present
(Elmt
) loop
1981 Freeze_Before
(I_Node
, Node
(Elmt
));
1986 -- If there are default subprograms, normalize the tree by adding
1987 -- explicit associations for them. This is required if the instance
1988 -- appears within a generic.
1996 Elmt
:= First_Elmt
(Default_Actuals
);
1997 while Present
(Elmt
) loop
1998 if No
(Actuals
) then
1999 Actuals
:= New_List
;
2000 Set_Generic_Associations
(I_Node
, Actuals
);
2003 Subp
:= Node
(Elmt
);
2005 Make_Generic_Association
(Sloc
(Subp
),
2006 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
2007 Explicit_Generic_Actual_Parameter
=>
2008 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
2009 Mark_Rewrite_Insertion
(New_D
);
2010 Append_To
(Actuals
, New_D
);
2015 -- If this is a formal package, normalize the parameter list by adding
2016 -- explicit box associations for the formals that are covered by an
2019 if not Is_Empty_List
(Default_Formals
) then
2020 Append_List
(Default_Formals
, Formals
);
2024 end Analyze_Associations
;
2026 -------------------------------
2027 -- Analyze_Formal_Array_Type --
2028 -------------------------------
2030 procedure Analyze_Formal_Array_Type
2031 (T
: in out Entity_Id
;
2037 -- Treated like a non-generic array declaration, with additional
2042 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2043 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2044 while Present
(DSS
) loop
2045 if Nkind_In
(DSS
, N_Subtype_Indication
,
2047 N_Attribute_Reference
)
2049 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2056 Array_Type_Declaration
(T
, Def
);
2057 Set_Is_Generic_Type
(Base_Type
(T
));
2059 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2060 and then No
(Full_View
(Component_Type
(T
)))
2062 Error_Msg_N
("premature usage of incomplete type", Def
);
2064 -- Check that range constraint is not allowed on the component type
2065 -- of a generic formal array type (AARM 12.5.3(3))
2067 elsif Is_Internal
(Component_Type
(T
))
2068 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2069 and then Nkind
(Original_Node
2070 (Subtype_Indication
(Component_Definition
(Def
)))) =
2071 N_Subtype_Indication
2074 ("in a formal, a subtype indication can only be "
2075 & "a subtype mark (RM 12.5.3(3))",
2076 Subtype_Indication
(Component_Definition
(Def
)));
2079 end Analyze_Formal_Array_Type
;
2081 ---------------------------------------------
2082 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2083 ---------------------------------------------
2085 -- As for other generic types, we create a valid type representation with
2086 -- legal but arbitrary attributes, whose values are never considered
2087 -- static. For all scalar types we introduce an anonymous base type, with
2088 -- the same attributes. We choose the corresponding integer type to be
2089 -- Standard_Integer.
2090 -- Here and in other similar routines, the Sloc of the generated internal
2091 -- type must be the same as the sloc of the defining identifier of the
2092 -- formal type declaration, to provide proper source navigation.
2094 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2098 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2100 Base
: constant Entity_Id
:=
2102 (E_Decimal_Fixed_Point_Type
,
2104 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2106 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2107 Delta_Val
: constant Ureal
:= Ureal_1
;
2108 Digs_Val
: constant Uint
:= Uint_6
;
2110 function Make_Dummy_Bound
return Node_Id
;
2111 -- Return a properly typed universal real literal to use as a bound
2113 ----------------------
2114 -- Make_Dummy_Bound --
2115 ----------------------
2117 function Make_Dummy_Bound
return Node_Id
is
2118 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2120 Set_Etype
(Bound
, Universal_Real
);
2122 end Make_Dummy_Bound
;
2124 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2129 Set_Etype
(Base
, Base
);
2130 Set_Size_Info
(Base
, Int_Base
);
2131 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2132 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2133 Set_Digits_Value
(Base
, Digs_Val
);
2134 Set_Delta_Value
(Base
, Delta_Val
);
2135 Set_Small_Value
(Base
, Delta_Val
);
2136 Set_Scalar_Range
(Base
,
2138 Low_Bound
=> Make_Dummy_Bound
,
2139 High_Bound
=> Make_Dummy_Bound
));
2141 Set_Is_Generic_Type
(Base
);
2142 Set_Parent
(Base
, Parent
(Def
));
2144 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2145 Set_Etype
(T
, Base
);
2146 Set_Size_Info
(T
, Int_Base
);
2147 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2148 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2149 Set_Digits_Value
(T
, Digs_Val
);
2150 Set_Delta_Value
(T
, Delta_Val
);
2151 Set_Small_Value
(T
, Delta_Val
);
2152 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2153 Set_Is_Constrained
(T
);
2155 Check_Restriction
(No_Fixed_Point
, Def
);
2156 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2158 -------------------------------------------
2159 -- Analyze_Formal_Derived_Interface_Type --
2160 -------------------------------------------
2162 procedure Analyze_Formal_Derived_Interface_Type
2167 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2170 -- Rewrite as a type declaration of a derived type. This ensures that
2171 -- the interface list and primitive operations are properly captured.
2174 Make_Full_Type_Declaration
(Loc
,
2175 Defining_Identifier
=> T
,
2176 Type_Definition
=> Def
));
2178 Set_Is_Generic_Type
(T
);
2179 end Analyze_Formal_Derived_Interface_Type
;
2181 ---------------------------------
2182 -- Analyze_Formal_Derived_Type --
2183 ---------------------------------
2185 procedure Analyze_Formal_Derived_Type
2190 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2191 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2195 Set_Is_Generic_Type
(T
);
2197 if Private_Present
(Def
) then
2199 Make_Private_Extension_Declaration
(Loc
,
2200 Defining_Identifier
=> T
,
2201 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2202 Unknown_Discriminants_Present
=> Unk_Disc
,
2203 Subtype_Indication
=> Subtype_Mark
(Def
),
2204 Interface_List
=> Interface_List
(Def
));
2206 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2207 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2208 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2212 Make_Full_Type_Declaration
(Loc
,
2213 Defining_Identifier
=> T
,
2214 Discriminant_Specifications
=>
2215 Discriminant_Specifications
(Parent
(T
)),
2217 Make_Derived_Type_Definition
(Loc
,
2218 Subtype_Indication
=> Subtype_Mark
(Def
)));
2220 Set_Abstract_Present
2221 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2223 (Type_Definition
(New_N
), Limited_Present
(Def
));
2230 if not Is_Composite_Type
(T
) then
2232 ("unknown discriminants not allowed for elementary types", N
);
2234 Set_Has_Unknown_Discriminants
(T
);
2235 Set_Is_Constrained
(T
, False);
2239 -- If the parent type has a known size, so does the formal, which makes
2240 -- legal representation clauses that involve the formal.
2242 Set_Size_Known_At_Compile_Time
2243 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2244 end Analyze_Formal_Derived_Type
;
2246 ----------------------------------
2247 -- Analyze_Formal_Discrete_Type --
2248 ----------------------------------
2250 -- The operations defined for a discrete types are those of an enumeration
2251 -- type. The size is set to an arbitrary value, for use in analyzing the
2254 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2255 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2259 Base
: constant Entity_Id
:=
2261 (E_Floating_Point_Type
, Current_Scope
,
2262 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2266 Set_Ekind
(T
, E_Enumeration_Subtype
);
2267 Set_Etype
(T
, Base
);
2270 Set_Is_Generic_Type
(T
);
2271 Set_Is_Constrained
(T
);
2273 -- For semantic analysis, the bounds of the type must be set to some
2274 -- non-static value. The simplest is to create attribute nodes for those
2275 -- bounds, that refer to the type itself. These bounds are never
2276 -- analyzed but serve as place-holders.
2279 Make_Attribute_Reference
(Loc
,
2280 Attribute_Name
=> Name_First
,
2281 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2285 Make_Attribute_Reference
(Loc
,
2286 Attribute_Name
=> Name_Last
,
2287 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2290 Set_Scalar_Range
(T
,
2295 Set_Ekind
(Base
, E_Enumeration_Type
);
2296 Set_Etype
(Base
, Base
);
2297 Init_Size
(Base
, 8);
2298 Init_Alignment
(Base
);
2299 Set_Is_Generic_Type
(Base
);
2300 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2301 Set_Parent
(Base
, Parent
(Def
));
2302 end Analyze_Formal_Discrete_Type
;
2304 ----------------------------------
2305 -- Analyze_Formal_Floating_Type --
2306 ---------------------------------
2308 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2309 Base
: constant Entity_Id
:=
2311 (E_Floating_Point_Type
, Current_Scope
,
2312 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2315 -- The various semantic attributes are taken from the predefined type
2316 -- Float, just so that all of them are initialized. Their values are
2317 -- never used because no constant folding or expansion takes place in
2318 -- the generic itself.
2321 Set_Ekind
(T
, E_Floating_Point_Subtype
);
2322 Set_Etype
(T
, Base
);
2323 Set_Size_Info
(T
, (Standard_Float
));
2324 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2325 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2326 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2327 Set_Is_Constrained
(T
);
2329 Set_Is_Generic_Type
(Base
);
2330 Set_Etype
(Base
, Base
);
2331 Set_Size_Info
(Base
, (Standard_Float
));
2332 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2333 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2334 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2335 Set_Parent
(Base
, Parent
(Def
));
2337 Check_Restriction
(No_Floating_Point
, Def
);
2338 end Analyze_Formal_Floating_Type
;
2340 -----------------------------------
2341 -- Analyze_Formal_Interface_Type;--
2342 -----------------------------------
2344 procedure Analyze_Formal_Interface_Type
2349 Loc
: constant Source_Ptr
:= Sloc
(N
);
2354 Make_Full_Type_Declaration
(Loc
,
2355 Defining_Identifier
=> T
,
2356 Type_Definition
=> Def
);
2360 Set_Is_Generic_Type
(T
);
2361 end Analyze_Formal_Interface_Type
;
2363 ---------------------------------
2364 -- Analyze_Formal_Modular_Type --
2365 ---------------------------------
2367 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2369 -- Apart from their entity kind, generic modular types are treated like
2370 -- signed integer types, and have the same attributes.
2372 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2373 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
2374 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2376 end Analyze_Formal_Modular_Type
;
2378 ---------------------------------------
2379 -- Analyze_Formal_Object_Declaration --
2380 ---------------------------------------
2382 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2383 E
: constant Node_Id
:= Default_Expression
(N
);
2384 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2391 -- Determine the mode of the formal object
2393 if Out_Present
(N
) then
2394 K
:= E_Generic_In_Out_Parameter
;
2396 if not In_Present
(N
) then
2397 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2401 K
:= E_Generic_In_Parameter
;
2404 if Present
(Subtype_Mark
(N
)) then
2405 Find_Type
(Subtype_Mark
(N
));
2406 T
:= Entity
(Subtype_Mark
(N
));
2408 -- Verify that there is no redundant null exclusion
2410 if Null_Exclusion_Present
(N
) then
2411 if not Is_Access_Type
(T
) then
2413 ("null exclusion can only apply to an access type", N
);
2415 elsif Can_Never_Be_Null
(T
) then
2417 ("`NOT NULL` not allowed (& already excludes null)",
2422 -- Ada 2005 (AI-423): Formal object with an access definition
2425 Check_Access_Definition
(N
);
2426 T
:= Access_Definition
2428 N
=> Access_Definition
(N
));
2431 if Ekind
(T
) = E_Incomplete_Type
then
2433 Error_Node
: Node_Id
;
2436 if Present
(Subtype_Mark
(N
)) then
2437 Error_Node
:= Subtype_Mark
(N
);
2439 Check_Access_Definition
(N
);
2440 Error_Node
:= Access_Definition
(N
);
2443 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2447 if K
= E_Generic_In_Parameter
then
2449 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2451 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2453 ("generic formal of mode IN must not be of limited type", N
);
2454 Explain_Limited_Type
(T
, N
);
2457 if Is_Abstract_Type
(T
) then
2459 ("generic formal of mode IN must not be of abstract type", N
);
2463 Preanalyze_Spec_Expression
(E
, T
);
2465 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2467 ("initialization not allowed for limited types", E
);
2468 Explain_Limited_Type
(T
, E
);
2475 -- Case of generic IN OUT parameter
2478 -- If the formal has an unconstrained type, construct its actual
2479 -- subtype, as is done for subprogram formals. In this fashion, all
2480 -- its uses can refer to specific bounds.
2485 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2486 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2489 Non_Freezing_Ref
: constant Node_Id
:=
2490 New_Occurrence_Of
(Id
, Sloc
(Id
));
2494 -- Make sure the actual subtype doesn't generate bogus freezing
2496 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2497 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2498 Insert_Before_And_Analyze
(N
, Decl
);
2499 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2502 Set_Actual_Subtype
(Id
, T
);
2507 ("initialization not allowed for `IN OUT` formals", N
);
2511 if Has_Aspects
(N
) then
2512 Analyze_Aspect_Specifications
(N
, Id
);
2514 end Analyze_Formal_Object_Declaration
;
2516 ----------------------------------------------
2517 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2518 ----------------------------------------------
2520 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2524 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2525 Base
: constant Entity_Id
:=
2527 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2528 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2531 -- The semantic attributes are set for completeness only, their values
2532 -- will never be used, since all properties of the type are non-static.
2535 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2536 Set_Etype
(T
, Base
);
2537 Set_Size_Info
(T
, Standard_Integer
);
2538 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2539 Set_Small_Value
(T
, Ureal_1
);
2540 Set_Delta_Value
(T
, Ureal_1
);
2541 Set_Scalar_Range
(T
,
2543 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2544 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2545 Set_Is_Constrained
(T
);
2547 Set_Is_Generic_Type
(Base
);
2548 Set_Etype
(Base
, Base
);
2549 Set_Size_Info
(Base
, Standard_Integer
);
2550 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2551 Set_Small_Value
(Base
, Ureal_1
);
2552 Set_Delta_Value
(Base
, Ureal_1
);
2553 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2554 Set_Parent
(Base
, Parent
(Def
));
2556 Check_Restriction
(No_Fixed_Point
, Def
);
2557 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2559 ----------------------------------------
2560 -- Analyze_Formal_Package_Declaration --
2561 ----------------------------------------
2563 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2564 Loc
: constant Source_Ptr
:= Sloc
(N
);
2565 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2567 Gen_Id
: constant Node_Id
:= Name
(N
);
2569 Gen_Unit
: Entity_Id
;
2571 Parent_Installed
: Boolean := False;
2573 Parent_Instance
: Entity_Id
;
2574 Renaming_In_Par
: Entity_Id
;
2575 Associations
: Boolean := True;
2577 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2578 -- List of primitives made temporarily visible in the instantiation
2579 -- to match the visibility of the formal type
2581 function Build_Local_Package
return Node_Id
;
2582 -- The formal package is rewritten so that its parameters are replaced
2583 -- with corresponding declarations. For parameters with bona fide
2584 -- associations these declarations are created by Analyze_Associations
2585 -- as for a regular instantiation. For boxed parameters, we preserve
2586 -- the formal declarations and analyze them, in order to introduce
2587 -- entities of the right kind in the environment of the formal.
2589 -------------------------
2590 -- Build_Local_Package --
2591 -------------------------
2593 function Build_Local_Package
return Node_Id
is
2595 Pack_Decl
: Node_Id
;
2598 -- Within the formal, the name of the generic package is a renaming
2599 -- of the formal (as for a regular instantiation).
2602 Make_Package_Declaration
(Loc
,
2605 (Specification
(Original_Node
(Gen_Decl
)),
2606 Empty
, Instantiating
=> True));
2608 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
2609 Defining_Unit_Name
=>
2610 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2611 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2613 if Nkind
(Gen_Id
) = N_Identifier
2614 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2617 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2620 -- If the formal is declared with a box, or with an others choice,
2621 -- create corresponding declarations for all entities in the formal
2622 -- part, so that names with the proper types are available in the
2623 -- specification of the formal package.
2625 -- On the other hand, if there are no associations, then all the
2626 -- formals must have defaults, and this will be checked by the
2627 -- call to Analyze_Associations.
2630 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2633 Formal_Decl
: Node_Id
;
2636 -- TBA : for a formal package, need to recurse ???
2641 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2642 while Present
(Formal_Decl
) loop
2644 (Decls
, Copy_Generic_Node
(Formal_Decl
, Empty
, True));
2649 -- If generic associations are present, use Analyze_Associations to
2650 -- create the proper renaming declarations.
2654 Act_Tree
: constant Node_Id
:=
2656 (Original_Node
(Gen_Decl
), Empty
,
2657 Instantiating
=> True);
2660 Generic_Renamings
.Set_Last
(0);
2661 Generic_Renamings_HTable
.Reset
;
2662 Instantiation_Node
:= N
;
2665 Analyze_Associations
2666 (I_Node
=> Original_Node
(N
),
2667 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2668 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2670 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2674 Append
(Renaming
, To
=> Decls
);
2676 -- Add generated declarations ahead of local declarations in
2679 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2680 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2683 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2688 end Build_Local_Package
;
2690 -- Start of processing for Analyze_Formal_Package_Declaration
2693 Check_Text_IO_Special_Unit
(Gen_Id
);
2696 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2697 Gen_Unit
:= Entity
(Gen_Id
);
2699 -- Check for a formal package that is a package renaming
2701 if Present
(Renamed_Object
(Gen_Unit
)) then
2703 -- Indicate that unit is used, before replacing it with renamed
2704 -- entity for use below.
2706 if In_Extended_Main_Source_Unit
(N
) then
2707 Set_Is_Instantiated
(Gen_Unit
);
2708 Generate_Reference
(Gen_Unit
, N
);
2711 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2714 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2715 Error_Msg_N
("expect generic package name", Gen_Id
);
2719 elsif Gen_Unit
= Current_Scope
then
2721 ("generic package cannot be used as a formal package of itself",
2726 elsif In_Open_Scopes
(Gen_Unit
) then
2727 if Is_Compilation_Unit
(Gen_Unit
)
2728 and then Is_Child_Unit
(Current_Scope
)
2730 -- Special-case the error when the formal is a parent, and
2731 -- continue analysis to minimize cascaded errors.
2734 ("generic parent cannot be used as formal package "
2735 & "of a child unit",
2740 ("generic package cannot be used as a formal package "
2748 -- Check that name of formal package does not hide name of generic,
2749 -- or its leading prefix. This check must be done separately because
2750 -- the name of the generic has already been analyzed.
2753 Gen_Name
: Entity_Id
;
2757 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
2758 Gen_Name
:= Prefix
(Gen_Name
);
2761 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
2763 ("& is hidden within declaration of formal package",
2769 or else No
(Generic_Associations
(N
))
2770 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2772 Associations
:= False;
2775 -- If there are no generic associations, the generic parameters appear
2776 -- as local entities and are instantiated like them. We copy the generic
2777 -- package declaration as if it were an instantiation, and analyze it
2778 -- like a regular package, except that we treat the formals as
2779 -- additional visible components.
2781 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2783 if In_Extended_Main_Source_Unit
(N
) then
2784 Set_Is_Instantiated
(Gen_Unit
);
2785 Generate_Reference
(Gen_Unit
, N
);
2788 Formal
:= New_Copy
(Pack_Id
);
2789 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2792 -- Make local generic without formals. The formals will be replaced
2793 -- with internal declarations.
2795 New_N
:= Build_Local_Package
;
2797 -- If there are errors in the parameter list, Analyze_Associations
2798 -- raises Instantiation_Error. Patch the declaration to prevent
2799 -- further exception propagation.
2802 when Instantiation_Error
=>
2804 Enter_Name
(Formal
);
2805 Set_Ekind
(Formal
, E_Variable
);
2806 Set_Etype
(Formal
, Any_Type
);
2807 Restore_Hidden_Primitives
(Vis_Prims_List
);
2809 if Parent_Installed
then
2817 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2818 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2819 Set_Instance_Env
(Gen_Unit
, Formal
);
2820 Set_Is_Generic_Instance
(Formal
);
2822 Enter_Name
(Formal
);
2823 Set_Ekind
(Formal
, E_Package
);
2824 Set_Etype
(Formal
, Standard_Void_Type
);
2825 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2826 Push_Scope
(Formal
);
2828 if Is_Child_Unit
(Gen_Unit
)
2829 and then Parent_Installed
2831 -- Similarly, we have to make the name of the formal visible in the
2832 -- parent instance, to resolve properly fully qualified names that
2833 -- may appear in the generic unit. The parent instance has been
2834 -- placed on the scope stack ahead of the current scope.
2836 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2839 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2840 Set_Ekind
(Renaming_In_Par
, E_Package
);
2841 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2842 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2843 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2844 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2845 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2848 Analyze
(Specification
(N
));
2850 -- The formals for which associations are provided are not visible
2851 -- outside of the formal package. The others are still declared by a
2852 -- formal parameter declaration.
2854 -- If there are no associations, the only local entity to hide is the
2855 -- generated package renaming itself.
2861 E
:= First_Entity
(Formal
);
2862 while Present
(E
) loop
2864 and then not Is_Generic_Formal
(E
)
2869 if Ekind
(E
) = E_Package
2870 and then Renamed_Entity
(E
) = Formal
2880 End_Package_Scope
(Formal
);
2881 Restore_Hidden_Primitives
(Vis_Prims_List
);
2883 if Parent_Installed
then
2889 -- Inside the generic unit, the formal package is a regular package, but
2890 -- no body is needed for it. Note that after instantiation, the defining
2891 -- unit name we need is in the new tree and not in the original (see
2892 -- Package_Instantiation). A generic formal package is an instance, and
2893 -- can be used as an actual for an inner instance.
2895 Set_Has_Completion
(Formal
, True);
2897 -- Add semantic information to the original defining identifier.
2900 Set_Ekind
(Pack_Id
, E_Package
);
2901 Set_Etype
(Pack_Id
, Standard_Void_Type
);
2902 Set_Scope
(Pack_Id
, Scope
(Formal
));
2903 Set_Has_Completion
(Pack_Id
, True);
2906 if Has_Aspects
(N
) then
2907 Analyze_Aspect_Specifications
(N
, Pack_Id
);
2909 end Analyze_Formal_Package_Declaration
;
2911 ---------------------------------
2912 -- Analyze_Formal_Private_Type --
2913 ---------------------------------
2915 procedure Analyze_Formal_Private_Type
2921 New_Private_Type
(N
, T
, Def
);
2923 -- Set the size to an arbitrary but legal value
2925 Set_Size_Info
(T
, Standard_Integer
);
2926 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2927 end Analyze_Formal_Private_Type
;
2929 ------------------------------------
2930 -- Analyze_Formal_Incomplete_Type --
2931 ------------------------------------
2933 procedure Analyze_Formal_Incomplete_Type
2939 Set_Ekind
(T
, E_Incomplete_Type
);
2941 Set_Private_Dependents
(T
, New_Elmt_List
);
2943 if Tagged_Present
(Def
) then
2944 Set_Is_Tagged_Type
(T
);
2945 Make_Class_Wide_Type
(T
);
2946 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
2948 end Analyze_Formal_Incomplete_Type
;
2950 ----------------------------------------
2951 -- Analyze_Formal_Signed_Integer_Type --
2952 ----------------------------------------
2954 procedure Analyze_Formal_Signed_Integer_Type
2958 Base
: constant Entity_Id
:=
2960 (E_Signed_Integer_Type
,
2962 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2967 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
2968 Set_Etype
(T
, Base
);
2969 Set_Size_Info
(T
, Standard_Integer
);
2970 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2971 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
2972 Set_Is_Constrained
(T
);
2974 Set_Is_Generic_Type
(Base
);
2975 Set_Size_Info
(Base
, Standard_Integer
);
2976 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2977 Set_Etype
(Base
, Base
);
2978 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
2979 Set_Parent
(Base
, Parent
(Def
));
2980 end Analyze_Formal_Signed_Integer_Type
;
2982 -------------------------------------------
2983 -- Analyze_Formal_Subprogram_Declaration --
2984 -------------------------------------------
2986 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
2987 Spec
: constant Node_Id
:= Specification
(N
);
2988 Def
: constant Node_Id
:= Default_Name
(N
);
2989 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2997 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
2998 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3002 Analyze_Subprogram_Declaration
(N
);
3003 Set_Is_Formal_Subprogram
(Nam
);
3004 Set_Has_Completion
(Nam
);
3006 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3007 Set_Is_Abstract_Subprogram
(Nam
);
3008 Set_Is_Dispatching_Operation
(Nam
);
3011 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3013 if No
(Ctrl_Type
) then
3015 ("abstract formal subprogram must have a controlling type",
3018 elsif Ada_Version
>= Ada_2012
3019 and then Is_Incomplete_Type
(Ctrl_Type
)
3022 ("controlling type of abstract formal subprogram cannot " &
3023 "be incomplete type", N
, Ctrl_Type
);
3026 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3031 -- Default name is resolved at the point of instantiation
3033 if Box_Present
(N
) then
3036 -- Else default is bound at the point of generic declaration
3038 elsif Present
(Def
) then
3039 if Nkind
(Def
) = N_Operator_Symbol
then
3040 Find_Direct_Name
(Def
);
3042 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3046 -- For an attribute reference, analyze the prefix and verify
3047 -- that it has the proper profile for the subprogram.
3049 Analyze
(Prefix
(Def
));
3050 Valid_Default_Attribute
(Nam
, Def
);
3054 -- Default name may be overloaded, in which case the interpretation
3055 -- with the correct profile must be selected, as for a renaming.
3056 -- If the definition is an indexed component, it must denote a
3057 -- member of an entry family. If it is a selected component, it
3058 -- can be a protected operation.
3060 if Etype
(Def
) = Any_Type
then
3063 elsif Nkind
(Def
) = N_Selected_Component
then
3064 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3065 Error_Msg_N
("expect valid subprogram name as default", Def
);
3068 elsif Nkind
(Def
) = N_Indexed_Component
then
3069 if Is_Entity_Name
(Prefix
(Def
)) then
3070 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3071 Error_Msg_N
("expect valid subprogram name as default", Def
);
3074 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3075 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3078 Error_Msg_N
("expect valid subprogram name as default", Def
);
3082 Error_Msg_N
("expect valid subprogram name as default", Def
);
3086 elsif Nkind
(Def
) = N_Character_Literal
then
3088 -- Needs some type checks: subprogram should be parameterless???
3090 Resolve
(Def
, (Etype
(Nam
)));
3092 elsif not Is_Entity_Name
(Def
)
3093 or else not Is_Overloadable
(Entity
(Def
))
3095 Error_Msg_N
("expect valid subprogram name as default", Def
);
3098 elsif not Is_Overloaded
(Def
) then
3099 Subp
:= Entity
(Def
);
3102 Error_Msg_N
("premature usage of formal subprogram", Def
);
3104 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3105 Error_Msg_N
("no visible entity matches specification", Def
);
3108 -- More than one interpretation, so disambiguate as for a renaming
3113 I1
: Interp_Index
:= 0;
3119 Get_First_Interp
(Def
, I
, It
);
3120 while Present
(It
.Nam
) loop
3121 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3122 if Subp
/= Any_Id
then
3123 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3125 if It1
= No_Interp
then
3126 Error_Msg_N
("ambiguous default subprogram", Def
);
3139 Get_Next_Interp
(I
, It
);
3143 if Subp
/= Any_Id
then
3145 -- Subprogram found, generate reference to it
3147 Set_Entity
(Def
, Subp
);
3148 Generate_Reference
(Subp
, Def
);
3151 Error_Msg_N
("premature usage of formal subprogram", Def
);
3153 elsif Ekind
(Subp
) /= E_Operator
then
3154 Check_Mode_Conformant
(Subp
, Nam
);
3158 Error_Msg_N
("no visible subprogram matches specification", N
);
3164 if Has_Aspects
(N
) then
3165 Analyze_Aspect_Specifications
(N
, Nam
);
3168 end Analyze_Formal_Subprogram_Declaration
;
3170 -------------------------------------
3171 -- Analyze_Formal_Type_Declaration --
3172 -------------------------------------
3174 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3175 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3179 T
:= Defining_Identifier
(N
);
3181 if Present
(Discriminant_Specifications
(N
))
3182 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3185 ("discriminants not allowed for this formal type", T
);
3188 -- Enter the new name, and branch to specific routine
3191 when N_Formal_Private_Type_Definition
=>
3192 Analyze_Formal_Private_Type
(N
, T
, Def
);
3194 when N_Formal_Derived_Type_Definition
=>
3195 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3197 when N_Formal_Incomplete_Type_Definition
=>
3198 Analyze_Formal_Incomplete_Type
(T
, Def
);
3200 when N_Formal_Discrete_Type_Definition
=>
3201 Analyze_Formal_Discrete_Type
(T
, Def
);
3203 when N_Formal_Signed_Integer_Type_Definition
=>
3204 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3206 when N_Formal_Modular_Type_Definition
=>
3207 Analyze_Formal_Modular_Type
(T
, Def
);
3209 when N_Formal_Floating_Point_Definition
=>
3210 Analyze_Formal_Floating_Type
(T
, Def
);
3212 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3213 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3215 when N_Formal_Decimal_Fixed_Point_Definition
=>
3216 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3218 when N_Array_Type_Definition
=>
3219 Analyze_Formal_Array_Type
(T
, Def
);
3221 when N_Access_To_Object_Definition |
3222 N_Access_Function_Definition |
3223 N_Access_Procedure_Definition
=>
3224 Analyze_Generic_Access_Type
(T
, Def
);
3226 -- Ada 2005: a interface declaration is encoded as an abstract
3227 -- record declaration or a abstract type derivation.
3229 when N_Record_Definition
=>
3230 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3232 when N_Derived_Type_Definition
=>
3233 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3239 raise Program_Error
;
3243 Set_Is_Generic_Type
(T
);
3245 if Has_Aspects
(N
) then
3246 Analyze_Aspect_Specifications
(N
, T
);
3248 end Analyze_Formal_Type_Declaration
;
3250 ------------------------------------
3251 -- Analyze_Function_Instantiation --
3252 ------------------------------------
3254 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3256 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3257 end Analyze_Function_Instantiation
;
3259 ---------------------------------
3260 -- Analyze_Generic_Access_Type --
3261 ---------------------------------
3263 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3267 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3268 Access_Type_Declaration
(T
, Def
);
3270 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3271 and then No
(Full_View
(Designated_Type
(T
)))
3272 and then not Is_Generic_Type
(Designated_Type
(T
))
3274 Error_Msg_N
("premature usage of incomplete type", Def
);
3276 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3278 ("only a subtype mark is allowed in a formal", Def
);
3282 Access_Subprogram_Declaration
(T
, Def
);
3284 end Analyze_Generic_Access_Type
;
3286 ---------------------------------
3287 -- Analyze_Generic_Formal_Part --
3288 ---------------------------------
3290 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3291 Gen_Parm_Decl
: Node_Id
;
3294 -- The generic formals are processed in the scope of the generic unit,
3295 -- where they are immediately visible. The scope is installed by the
3298 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3300 while Present
(Gen_Parm_Decl
) loop
3301 Analyze
(Gen_Parm_Decl
);
3302 Next
(Gen_Parm_Decl
);
3305 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3306 end Analyze_Generic_Formal_Part
;
3308 ------------------------------------------
3309 -- Analyze_Generic_Package_Declaration --
3310 ------------------------------------------
3312 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3313 Loc
: constant Source_Ptr
:= Sloc
(N
);
3316 Save_Parent
: Node_Id
;
3318 Decls
: constant List_Id
:=
3319 Visible_Declarations
(Specification
(N
));
3323 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3325 -- We introduce a renaming of the enclosing package, to have a usable
3326 -- entity as the prefix of an expanded name for a local entity of the
3327 -- form Par.P.Q, where P is the generic package. This is because a local
3328 -- entity named P may hide it, so that the usual visibility rules in
3329 -- the instance will not resolve properly.
3332 Make_Package_Renaming_Declaration
(Loc
,
3333 Defining_Unit_Name
=>
3334 Make_Defining_Identifier
(Loc
,
3335 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3336 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3338 if Present
(Decls
) then
3339 Decl
:= First
(Decls
);
3340 while Present
(Decl
)
3341 and then Nkind
(Decl
) = N_Pragma
3346 if Present
(Decl
) then
3347 Insert_Before
(Decl
, Renaming
);
3349 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3353 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3356 -- Create copy of generic unit, and save for instantiation. If the unit
3357 -- is a child unit, do not copy the specifications for the parent, which
3358 -- are not part of the generic tree.
3360 Save_Parent
:= Parent_Spec
(N
);
3361 Set_Parent_Spec
(N
, Empty
);
3363 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3364 Set_Parent_Spec
(New_N
, Save_Parent
);
3367 -- Once the contents of the generic copy and the template are swapped,
3368 -- do the same for their respective aspect specifications.
3370 Exchange_Aspects
(N
, New_N
);
3371 Id
:= Defining_Entity
(N
);
3372 Generate_Definition
(Id
);
3374 -- Expansion is not applied to generic units
3379 Set_Ekind
(Id
, E_Generic_Package
);
3380 Set_Etype
(Id
, Standard_Void_Type
);
3381 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
3383 -- Analyze aspects now, so that generated pragmas appear in the
3384 -- declarations before building and analyzing the generic copy.
3386 if Has_Aspects
(N
) then
3387 Analyze_Aspect_Specifications
(N
, Id
);
3391 Enter_Generic_Scope
(Id
);
3392 Set_Inner_Instances
(Id
, New_Elmt_List
);
3394 Set_Categorization_From_Pragmas
(N
);
3395 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3397 -- Link the declaration of the generic homonym in the generic copy to
3398 -- the package it renames, so that it is always resolved properly.
3400 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3401 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3403 -- For a library unit, we have reconstructed the entity for the unit,
3404 -- and must reset it in the library tables.
3406 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3407 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3410 Analyze_Generic_Formal_Part
(N
);
3412 -- After processing the generic formals, analysis proceeds as for a
3413 -- non-generic package.
3415 Analyze
(Specification
(N
));
3417 Validate_Categorization_Dependency
(N
, Id
);
3421 End_Package_Scope
(Id
);
3422 Exit_Generic_Scope
(Id
);
3424 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3425 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3426 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3427 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3430 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3431 Validate_RT_RAT_Component
(N
);
3433 -- If this is a spec without a body, check that generic parameters
3436 if not Body_Required
(Parent
(N
)) then
3437 Check_References
(Id
);
3441 -- If there is a specified storage pool in the context, create an
3442 -- aspect on the package declaration, so that it is used in any
3443 -- instance that does not override it.
3445 if Present
(Default_Pool
) then
3450 ASN
:= Make_Aspect_Specification
(Loc
,
3451 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3452 Expression
=> New_Copy
(Default_Pool
));
3454 if No
(Aspect_Specifications
(Specification
(N
))) then
3455 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3457 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3461 end Analyze_Generic_Package_Declaration
;
3463 --------------------------------------------
3464 -- Analyze_Generic_Subprogram_Declaration --
3465 --------------------------------------------
3467 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3472 Result_Type
: Entity_Id
;
3473 Save_Parent
: Node_Id
;
3477 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3479 -- Create copy of generic unit, and save for instantiation. If the unit
3480 -- is a child unit, do not copy the specifications for the parent, which
3481 -- are not part of the generic tree.
3483 Save_Parent
:= Parent_Spec
(N
);
3484 Set_Parent_Spec
(N
, Empty
);
3486 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3487 Set_Parent_Spec
(New_N
, Save_Parent
);
3490 -- Once the contents of the generic copy and the template are swapped,
3491 -- do the same for their respective aspect specifications.
3493 Exchange_Aspects
(N
, New_N
);
3495 Spec
:= Specification
(N
);
3496 Id
:= Defining_Entity
(Spec
);
3497 Generate_Definition
(Id
);
3498 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
3500 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3502 ("operator symbol not allowed for generic subprogram", Id
);
3508 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3510 -- Analyze the aspects of the generic copy to ensure that all generated
3511 -- pragmas (if any) perform their semantic effects.
3513 if Has_Aspects
(N
) then
3514 Analyze_Aspect_Specifications
(N
, Id
);
3518 Enter_Generic_Scope
(Id
);
3519 Set_Inner_Instances
(Id
, New_Elmt_List
);
3520 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3522 Analyze_Generic_Formal_Part
(N
);
3524 Formals
:= Parameter_Specifications
(Spec
);
3526 if Present
(Formals
) then
3527 Process_Formals
(Formals
, Spec
);
3530 if Nkind
(Spec
) = N_Function_Specification
then
3531 Set_Ekind
(Id
, E_Generic_Function
);
3533 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3534 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3535 Set_Etype
(Id
, Result_Type
);
3537 -- Check restriction imposed by AI05-073: a generic function
3538 -- cannot return an abstract type or an access to such.
3540 -- This is a binding interpretation should it apply to earlier
3541 -- versions of Ada as well as Ada 2012???
3543 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
3544 and then Ada_Version
>= Ada_2012
3546 Error_Msg_N
("generic function cannot have an access result"
3547 & " that designates an abstract type", Spec
);
3551 Find_Type
(Result_Definition
(Spec
));
3552 Typ
:= Entity
(Result_Definition
(Spec
));
3554 if Is_Abstract_Type
(Typ
)
3555 and then Ada_Version
>= Ada_2012
3558 ("generic function cannot have abstract result type", Spec
);
3561 -- If a null exclusion is imposed on the result type, then create
3562 -- a null-excluding itype (an access subtype) and use it as the
3563 -- function's Etype.
3565 if Is_Access_Type
(Typ
)
3566 and then Null_Exclusion_Present
(Spec
)
3569 Create_Null_Excluding_Itype
3571 Related_Nod
=> Spec
,
3572 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3574 Set_Etype
(Id
, Typ
);
3579 Set_Ekind
(Id
, E_Generic_Procedure
);
3580 Set_Etype
(Id
, Standard_Void_Type
);
3583 -- For a library unit, we have reconstructed the entity for the unit,
3584 -- and must reset it in the library tables. We also make sure that
3585 -- Body_Required is set properly in the original compilation unit node.
3587 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3588 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3589 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3592 Set_Categorization_From_Pragmas
(N
);
3593 Validate_Categorization_Dependency
(N
, Id
);
3595 Save_Global_References
(Original_Node
(N
));
3597 -- For ASIS purposes, convert any postcondition, precondition pragmas
3598 -- into aspects, if N is not a compilation unit by itself, in order to
3599 -- enable the analysis of expressions inside the corresponding PPC
3602 if ASIS_Mode
and then Is_List_Member
(N
) then
3603 Make_Aspect_For_PPC_In_Gen_Sub_Decl
(N
);
3608 Exit_Generic_Scope
(Id
);
3609 Generate_Reference_To_Formals
(Id
);
3611 List_Inherited_Pre_Post_Aspects
(Id
);
3612 end Analyze_Generic_Subprogram_Declaration
;
3614 -----------------------------------
3615 -- Analyze_Package_Instantiation --
3616 -----------------------------------
3618 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
3619 Loc
: constant Source_Ptr
:= Sloc
(N
);
3620 Gen_Id
: constant Node_Id
:= Name
(N
);
3623 Act_Decl_Name
: Node_Id
;
3624 Act_Decl_Id
: Entity_Id
;
3630 Gen_Unit
: Entity_Id
;
3632 Is_Actual_Pack
: constant Boolean :=
3633 Is_Internal
(Defining_Entity
(N
));
3635 Env_Installed
: Boolean := False;
3636 Parent_Installed
: Boolean := False;
3637 Renaming_List
: List_Id
;
3638 Unit_Renaming
: Node_Id
;
3639 Needs_Body
: Boolean;
3640 Inline_Now
: Boolean := False;
3642 Save_IPSM
: constant Boolean := Ignore_Pragma_SPARK_Mode
;
3643 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
3645 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
3646 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
3647 -- Save the SPARK_Mode-related data for restore on exit
3649 Save_Style_Check
: constant Boolean := Style_Check
;
3650 -- Save style check mode for restore on exit
3652 procedure Delay_Descriptors
(E
: Entity_Id
);
3653 -- Delay generation of subprogram descriptors for given entity
3655 function Might_Inline_Subp
return Boolean;
3656 -- If inlining is active and the generic contains inlined subprograms,
3657 -- we instantiate the body. This may cause superfluous instantiations,
3658 -- but it is simpler than detecting the need for the body at the point
3659 -- of inlining, when the context of the instance is not available.
3661 -----------------------
3662 -- Delay_Descriptors --
3663 -----------------------
3665 procedure Delay_Descriptors
(E
: Entity_Id
) is
3667 if not Delay_Subprogram_Descriptors
(E
) then
3668 Set_Delay_Subprogram_Descriptors
(E
);
3669 Pending_Descriptor
.Append
(E
);
3671 end Delay_Descriptors
;
3673 -----------------------
3674 -- Might_Inline_Subp --
3675 -----------------------
3677 function Might_Inline_Subp
return Boolean is
3681 if not Inline_Processing_Required
then
3685 E
:= First_Entity
(Gen_Unit
);
3686 while Present
(E
) loop
3687 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
3696 end Might_Inline_Subp
;
3698 -- Local declarations
3700 Vis_Prims_List
: Elist_Id
:= No_Elist
;
3701 -- List of primitives made temporarily visible in the instantiation
3702 -- to match the visibility of the formal type
3704 -- Start of processing for Analyze_Package_Instantiation
3707 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3709 -- Very first thing: check for Text_IO sp[ecial unit in case we are
3710 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
3712 Check_Text_IO_Special_Unit
(Name
(N
));
3714 -- Make node global for error reporting
3716 Instantiation_Node
:= N
;
3718 -- Turn off style checking in instances. If the check is enabled on the
3719 -- generic unit, a warning in an instance would just be noise. If not
3720 -- enabled on the generic, then a warning in an instance is just wrong.
3722 Style_Check
:= False;
3724 -- Case of instantiation of a generic package
3726 if Nkind
(N
) = N_Package_Instantiation
then
3727 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3728 Set_Comes_From_Source
(Act_Decl_Id
, True);
3730 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
3732 Make_Defining_Program_Unit_Name
(Loc
,
3733 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
3734 Defining_Identifier
=> Act_Decl_Id
);
3736 Act_Decl_Name
:= Act_Decl_Id
;
3739 -- Case of instantiation of a formal package
3742 Act_Decl_Id
:= Defining_Identifier
(N
);
3743 Act_Decl_Name
:= Act_Decl_Id
;
3746 Generate_Definition
(Act_Decl_Id
);
3747 Preanalyze_Actuals
(N
);
3750 Env_Installed
:= True;
3752 -- Reset renaming map for formal types. The mapping is established
3753 -- when analyzing the generic associations, but some mappings are
3754 -- inherited from formal packages of parent units, and these are
3755 -- constructed when the parents are installed.
3757 Generic_Renamings
.Set_Last
(0);
3758 Generic_Renamings_HTable
.Reset
;
3760 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3761 Gen_Unit
:= Entity
(Gen_Id
);
3763 -- Verify that it is the name of a generic package
3765 -- A visibility glitch: if the instance is a child unit and the generic
3766 -- is the generic unit of a parent instance (i.e. both the parent and
3767 -- the child units are instances of the same package) the name now
3768 -- denotes the renaming within the parent, not the intended generic
3769 -- unit. See if there is a homonym that is the desired generic. The
3770 -- renaming declaration must be visible inside the instance of the
3771 -- child, but not when analyzing the name in the instantiation itself.
3773 if Ekind
(Gen_Unit
) = E_Package
3774 and then Present
(Renamed_Entity
(Gen_Unit
))
3775 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
3776 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
3777 and then Present
(Homonym
(Gen_Unit
))
3779 Gen_Unit
:= Homonym
(Gen_Unit
);
3782 if Etype
(Gen_Unit
) = Any_Type
then
3786 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
3788 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3790 if From_Limited_With
(Gen_Unit
) then
3792 ("cannot instantiate a limited withed package", Gen_Id
);
3795 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
3802 if In_Extended_Main_Source_Unit
(N
) then
3803 Set_Is_Instantiated
(Gen_Unit
);
3804 Generate_Reference
(Gen_Unit
, N
);
3806 if Present
(Renamed_Object
(Gen_Unit
)) then
3807 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
3808 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
3812 if Nkind
(Gen_Id
) = N_Identifier
3813 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3816 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3818 elsif Nkind
(Gen_Id
) = N_Expanded_Name
3819 and then Is_Child_Unit
(Gen_Unit
)
3820 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
3821 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
3824 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
3827 Set_Entity
(Gen_Id
, Gen_Unit
);
3829 -- If generic is a renaming, get original generic unit
3831 if Present
(Renamed_Object
(Gen_Unit
))
3832 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
3834 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3837 -- Verify that there are no circular instantiations
3839 if In_Open_Scopes
(Gen_Unit
) then
3840 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3844 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3845 Error_Msg_Node_2
:= Current_Scope
;
3847 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3848 Circularity_Detected
:= True;
3853 -- If the context of the instance is subject to SPARK_Mode "off",
3854 -- set the global flag which signals Analyze_Pragma to ignore all
3855 -- SPARK_Mode pragmas within the instance.
3857 if SPARK_Mode
= Off
then
3858 Ignore_Pragma_SPARK_Mode
:= True;
3861 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3862 Gen_Spec
:= Specification
(Gen_Decl
);
3864 -- Initialize renamings map, for error checking, and the list that
3865 -- holds private entities whose views have changed between generic
3866 -- definition and instantiation. If this is the instance created to
3867 -- validate an actual package, the instantiation environment is that
3868 -- of the enclosing instance.
3870 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3872 -- Copy original generic tree, to produce text for instantiation
3876 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3878 Act_Spec
:= Specification
(Act_Tree
);
3880 -- If this is the instance created to validate an actual package,
3881 -- only the formals matter, do not examine the package spec itself.
3883 if Is_Actual_Pack
then
3884 Set_Visible_Declarations
(Act_Spec
, New_List
);
3885 Set_Private_Declarations
(Act_Spec
, New_List
);
3889 Analyze_Associations
3891 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
3892 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
3894 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
3896 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3897 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3898 Set_Is_Generic_Instance
(Act_Decl_Id
);
3899 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3901 -- References to the generic in its own declaration or its body are
3902 -- references to the instance. Add a renaming declaration for the
3903 -- generic unit itself. This declaration, as well as the renaming
3904 -- declarations for the generic formals, must remain private to the
3905 -- unit: the formals, because this is the language semantics, and
3906 -- the unit because its use is an artifact of the implementation.
3909 Make_Package_Renaming_Declaration
(Loc
,
3910 Defining_Unit_Name
=>
3911 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3912 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
3914 Append
(Unit_Renaming
, Renaming_List
);
3916 -- The renaming declarations are the first local declarations of the
3919 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3921 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3923 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3926 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
3928 -- Propagate the aspect specifications from the package declaration
3929 -- template to the instantiated version of the package declaration.
3931 if Has_Aspects
(Act_Tree
) then
3932 Set_Aspect_Specifications
(Act_Decl
,
3933 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
3936 -- The generic may have a generated Default_Storage_Pool aspect,
3937 -- set at the point of generic declaration. If the instance has
3938 -- that aspect, it overrides the one inherited from the generic.
3940 if Has_Aspects
(Gen_Spec
) then
3941 if No
(Aspect_Specifications
(N
)) then
3942 Set_Aspect_Specifications
(N
,
3944 (Aspect_Specifications
(Gen_Spec
))));
3948 ASN1
, ASN2
: Node_Id
;
3951 ASN1
:= First
(Aspect_Specifications
(N
));
3952 while Present
(ASN1
) loop
3953 if Chars
(Identifier
(ASN1
))
3954 = Name_Default_Storage_Pool
3956 -- If generic carries a default storage pool, remove
3957 -- it in favor of the instance one.
3959 ASN2
:= First
(Aspect_Specifications
(Gen_Spec
));
3960 while Present
(ASN2
) loop
3961 if Chars
(Identifier
(ASN2
))
3962 = Name_Default_Storage_Pool
3975 Prepend_List_To
(Aspect_Specifications
(N
),
3977 (Aspect_Specifications
(Gen_Spec
))));
3982 -- Save the instantiation node, for subsequent instantiation of the
3983 -- body, if there is one and we are generating code for the current
3984 -- unit. Mark unit as having a body (avoids premature error message).
3986 -- We instantiate the body if we are generating code, if we are
3987 -- generating cross-reference information, or if we are building
3988 -- trees for ASIS use or GNATprove use.
3991 Enclosing_Body_Present
: Boolean := False;
3992 -- If the generic unit is not a compilation unit, then a body may
3993 -- be present in its parent even if none is required. We create a
3994 -- tentative pending instantiation for the body, which will be
3995 -- discarded if none is actually present.
4000 if Scope
(Gen_Unit
) /= Standard_Standard
4001 and then not Is_Child_Unit
(Gen_Unit
)
4003 Scop
:= Scope
(Gen_Unit
);
4005 while Present
(Scop
)
4006 and then Scop
/= Standard_Standard
4008 if Unit_Requires_Body
(Scop
) then
4009 Enclosing_Body_Present
:= True;
4012 elsif In_Open_Scopes
(Scop
)
4013 and then In_Package_Body
(Scop
)
4015 Enclosing_Body_Present
:= True;
4019 exit when Is_Compilation_Unit
(Scop
);
4020 Scop
:= Scope
(Scop
);
4024 -- If front-end inlining is enabled, and this is a unit for which
4025 -- code will be generated, we instantiate the body at once.
4027 -- This is done if the instance is not the main unit, and if the
4028 -- generic is not a child unit of another generic, to avoid scope
4029 -- problems and the reinstallation of parent instances.
4032 and then (not Is_Child_Unit
(Gen_Unit
)
4033 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4034 and then Might_Inline_Subp
4035 and then not Is_Actual_Pack
4037 if not Back_End_Inlining
4038 and then Front_End_Inlining
4039 and then (Is_In_Main_Unit
(N
)
4040 or else In_Main_Context
(Current_Scope
))
4041 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4045 -- In configurable_run_time mode we force the inlining of
4046 -- predefined subprograms marked Inline_Always, to minimize
4047 -- the use of the run-time library.
4049 elsif Is_Predefined_File_Name
4050 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
4051 and then Configurable_Run_Time_Mode
4052 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4057 -- If the current scope is itself an instance within a child
4058 -- unit, there will be duplications in the scope stack, and the
4059 -- unstacking mechanism in Inline_Instance_Body will fail.
4060 -- This loses some rare cases of optimization, and might be
4061 -- improved some day, if we can find a proper abstraction for
4062 -- "the complete compilation context" that can be saved and
4065 if Is_Generic_Instance
(Current_Scope
) then
4067 Curr_Unit
: constant Entity_Id
:=
4068 Cunit_Entity
(Current_Sem_Unit
);
4070 if Curr_Unit
/= Current_Scope
4071 and then Is_Child_Unit
(Curr_Unit
)
4073 Inline_Now
:= False;
4080 (Unit_Requires_Body
(Gen_Unit
)
4081 or else Enclosing_Body_Present
4082 or else Present
(Corresponding_Body
(Gen_Decl
)))
4083 and then (Is_In_Main_Unit
(N
) or else Might_Inline_Subp
)
4084 and then not Is_Actual_Pack
4085 and then not Inline_Now
4086 and then (Operating_Mode
= Generate_Code
4088 -- Need comment for this check ???
4090 or else (Operating_Mode
= Check_Semantics
4091 and then (ASIS_Mode
or GNATprove_Mode
)));
4093 -- If front_end_inlining is enabled, do not instantiate body if
4094 -- within a generic context.
4096 if (Front_End_Inlining
and then not Expander_Active
)
4097 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
4099 Needs_Body
:= False;
4102 -- If the current context is generic, and the package being
4103 -- instantiated is declared within a formal package, there is no
4104 -- body to instantiate until the enclosing generic is instantiated
4105 -- and there is an actual for the formal package. If the formal
4106 -- package has parameters, we build a regular package instance for
4107 -- it, that precedes the original formal package declaration.
4109 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4111 Decl
: constant Node_Id
:=
4113 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4115 if Nkind
(Decl
) = N_Formal_Package_Declaration
4116 or else (Nkind
(Decl
) = N_Package_Declaration
4117 and then Is_List_Member
(Decl
)
4118 and then Present
(Next
(Decl
))
4120 Nkind
(Next
(Decl
)) =
4121 N_Formal_Package_Declaration
)
4123 Needs_Body
:= False;
4129 -- For RCI unit calling stubs, we omit the instance body if the
4130 -- instance is the RCI library unit itself.
4132 -- However there is a special case for nested instances: in this case
4133 -- we do generate the instance body, as it might be required, e.g.
4134 -- because it provides stream attributes for some type used in the
4135 -- profile of a remote subprogram. This is consistent with 12.3(12),
4136 -- which indicates that the instance body occurs at the place of the
4137 -- instantiation, and thus is part of the RCI declaration, which is
4138 -- present on all client partitions (this is E.2.3(18)).
4140 -- Note that AI12-0002 may make it illegal at some point to have
4141 -- stream attributes defined in an RCI unit, in which case this
4142 -- special case will become unnecessary. In the meantime, there
4143 -- is known application code in production that depends on this
4144 -- being possible, so we definitely cannot eliminate the body in
4145 -- the case of nested instances for the time being.
4147 -- When we generate a nested instance body, calling stubs for any
4148 -- relevant subprogram will be be inserted immediately after the
4149 -- subprogram declarations, and will take precedence over the
4150 -- subsequent (original) body. (The stub and original body will be
4151 -- complete homographs, but this is permitted in an instance).
4152 -- (Could we do better and remove the original body???)
4154 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4155 and then Comes_From_Source
(N
)
4156 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4158 Needs_Body
:= False;
4163 -- Here is a defence against a ludicrous number of instantiations
4164 -- caused by a circular set of instantiation attempts.
4166 if Pending_Instantiations
.Last
> Maximum_Instantiations
then
4167 Error_Msg_Uint_1
:= UI_From_Int
(Maximum_Instantiations
);
4168 Error_Msg_N
("too many instantiations, exceeds max of^", N
);
4169 Error_Msg_N
("\limit can be changed using -gnateinn switch", N
);
4170 raise Unrecoverable_Error
;
4173 -- Indicate that the enclosing scopes contain an instantiation,
4174 -- and that cleanup actions should be delayed until after the
4175 -- instance body is expanded.
4177 Check_Forward_Instantiation
(Gen_Decl
);
4178 if Nkind
(N
) = N_Package_Instantiation
then
4180 Enclosing_Master
: Entity_Id
;
4183 -- Loop to search enclosing masters
4185 Enclosing_Master
:= Current_Scope
;
4186 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
4187 if Ekind
(Enclosing_Master
) = E_Package
then
4188 if Is_Compilation_Unit
(Enclosing_Master
) then
4189 if In_Package_Body
(Enclosing_Master
) then
4191 (Body_Entity
(Enclosing_Master
));
4200 Enclosing_Master
:= Scope
(Enclosing_Master
);
4203 elsif Is_Generic_Unit
(Enclosing_Master
)
4204 or else Ekind
(Enclosing_Master
) = E_Void
4206 -- Cleanup actions will eventually be performed on the
4207 -- enclosing subprogram or package instance, if any.
4208 -- Enclosing scope is void in the formal part of a
4209 -- generic subprogram.
4214 if Ekind
(Enclosing_Master
) = E_Entry
4216 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
4218 if not Expander_Active
then
4222 Protected_Body_Subprogram
(Enclosing_Master
);
4226 Set_Delay_Cleanups
(Enclosing_Master
);
4228 while Ekind
(Enclosing_Master
) = E_Block
loop
4229 Enclosing_Master
:= Scope
(Enclosing_Master
);
4232 if Is_Subprogram
(Enclosing_Master
) then
4233 Delay_Descriptors
(Enclosing_Master
);
4235 elsif Is_Task_Type
(Enclosing_Master
) then
4237 TBP
: constant Node_Id
:=
4238 Get_Task_Body_Procedure
4241 if Present
(TBP
) then
4242 Delay_Descriptors
(TBP
);
4243 Set_Delay_Cleanups
(TBP
);
4250 end loop Scope_Loop
;
4253 -- Make entry in table
4255 Pending_Instantiations
.Append
4257 Act_Decl
=> Act_Decl
,
4258 Expander_Status
=> Expander_Active
,
4259 Current_Sem_Unit
=> Current_Sem_Unit
,
4260 Scope_Suppress
=> Scope_Suppress
,
4261 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4262 Version
=> Ada_Version
,
4263 Version_Pragma
=> Ada_Version_Pragma
,
4264 Warnings
=> Save_Warnings
,
4265 SPARK_Mode
=> SPARK_Mode
,
4266 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
4270 Set_Categorization_From_Pragmas
(Act_Decl
);
4272 if Parent_Installed
then
4276 Set_Instance_Spec
(N
, Act_Decl
);
4278 -- If not a compilation unit, insert the package declaration before
4279 -- the original instantiation node.
4281 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4282 Mark_Rewrite_Insertion
(Act_Decl
);
4283 Insert_Before
(N
, Act_Decl
);
4285 if Has_Aspects
(N
) then
4286 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4288 -- The pragma created for a Default_Storage_Pool aspect must
4289 -- appear ahead of the declarations in the instance spec.
4290 -- Analysis has placed it after the instance node, so remove
4291 -- it and reinsert it properly now.
4294 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4295 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4299 if A_Name
= Name_Default_Storage_Pool
then
4300 if No
(Visible_Declarations
(Act_Spec
)) then
4301 Set_Visible_Declarations
(Act_Spec
, New_List
);
4305 while Present
(Decl
) loop
4306 if Nkind
(Decl
) = N_Pragma
then
4308 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4320 -- For an instantiation that is a compilation unit, place
4321 -- declaration on current node so context is complete for analysis
4322 -- (including nested instantiations). If this is the main unit,
4323 -- the declaration eventually replaces the instantiation node.
4324 -- If the instance body is created later, it replaces the
4325 -- instance node, and the declaration is attached to it
4326 -- (see Build_Instance_Compilation_Unit_Nodes).
4329 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4331 -- The entity for the current unit is the newly created one,
4332 -- and all semantic information is attached to it.
4334 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4336 -- If this is the main unit, replace the main entity as well
4338 if Current_Sem_Unit
= Main_Unit
then
4339 Main_Unit_Entity
:= Act_Decl_Id
;
4343 Set_Unit
(Parent
(N
), Act_Decl
);
4344 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4345 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4347 -- Process aspect specifications of the instance node, if any, to
4348 -- take into account categorization pragmas before analyzing the
4351 if Has_Aspects
(N
) then
4352 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4356 Set_Unit
(Parent
(N
), N
);
4357 Set_Body_Required
(Parent
(N
), False);
4359 -- We never need elaboration checks on instantiations, since by
4360 -- definition, the body instantiation is elaborated at the same
4361 -- time as the spec instantiation.
4363 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4364 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4367 Check_Elab_Instantiation
(N
);
4369 if ABE_Is_Certain
(N
) and then Needs_Body
then
4370 Pending_Instantiations
.Decrement_Last
;
4373 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4375 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4376 First_Private_Entity
(Act_Decl_Id
));
4378 -- If the instantiation will receive a body, the unit will be
4379 -- transformed into a package body, and receive its own elaboration
4380 -- entity. Otherwise, the nature of the unit is now a package
4383 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4384 and then not Needs_Body
4386 Rewrite
(N
, Act_Decl
);
4389 if Present
(Corresponding_Body
(Gen_Decl
))
4390 or else Unit_Requires_Body
(Gen_Unit
)
4392 Set_Has_Completion
(Act_Decl_Id
);
4395 Check_Formal_Packages
(Act_Decl_Id
);
4397 Restore_Hidden_Primitives
(Vis_Prims_List
);
4398 Restore_Private_Views
(Act_Decl_Id
);
4400 Inherit_Context
(Gen_Decl
, N
);
4402 if Parent_Installed
then
4407 Env_Installed
:= False;
4410 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4412 -- There used to be a check here to prevent instantiations in local
4413 -- contexts if the No_Local_Allocators restriction was active. This
4414 -- check was removed by a binding interpretation in AI-95-00130/07,
4415 -- but we retain the code for documentation purposes.
4417 -- if Ekind (Act_Decl_Id) /= E_Void
4418 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4420 -- Check_Restriction (No_Local_Allocators, N);
4424 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4427 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4428 -- be used as defining identifiers for a formal package and for the
4429 -- corresponding expanded package.
4431 if Nkind
(N
) = N_Formal_Package_Declaration
then
4432 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4433 Set_Comes_From_Source
(Act_Decl_Id
, True);
4434 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
4435 Set_Defining_Identifier
(N
, Act_Decl_Id
);
4438 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
4439 SPARK_Mode
:= Save_SM
;
4440 SPARK_Mode_Pragma
:= Save_SMP
;
4441 Style_Check
:= Save_Style_Check
;
4443 -- Check that if N is an instantiation of System.Dim_Float_IO or
4444 -- System.Dim_Integer_IO, the formal type has a dimension system.
4446 if Nkind
(N
) = N_Package_Instantiation
4447 and then Is_Dim_IO_Package_Instantiation
(N
)
4450 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4452 if not Has_Dimension_System
4453 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4455 Error_Msg_N
("type with a dimension system expected", Assoc
);
4461 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4462 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4466 when Instantiation_Error
=>
4467 if Parent_Installed
then
4471 if Env_Installed
then
4475 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
4476 SPARK_Mode
:= Save_SM
;
4477 SPARK_Mode_Pragma
:= Save_SMP
;
4478 Style_Check
:= Save_Style_Check
;
4479 end Analyze_Package_Instantiation
;
4481 --------------------------
4482 -- Inline_Instance_Body --
4483 --------------------------
4485 procedure Inline_Instance_Body
4487 Gen_Unit
: Entity_Id
;
4490 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
4491 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
4492 Gen_Comp
: constant Entity_Id
:=
4493 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
4495 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4496 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4497 -- Save all SPARK_Mode-related attributes as removing enclosing scopes
4498 -- to provide a clean environment for analysis of the inlined body will
4499 -- eliminate any previously set SPARK_Mode.
4501 Scope_Stack_Depth
: constant Int
:=
4502 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
4504 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
4505 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4506 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4507 Curr_Scope
: Entity_Id
:= Empty
;
4509 Num_Inner
: Int
:= 0;
4510 Num_Scopes
: Int
:= 0;
4511 N_Instances
: Int
:= 0;
4512 Removed
: Boolean := False;
4517 -- Case of generic unit defined in another unit. We must remove the
4518 -- complete context of the current unit to install that of the generic.
4520 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
4522 -- Add some comments for the following two loops ???
4525 while Present
(S
) and then S
/= Standard_Standard
loop
4527 Num_Scopes
:= Num_Scopes
+ 1;
4529 Use_Clauses
(Num_Scopes
) :=
4531 (Scope_Stack
.Last
- Num_Scopes
+ 1).
4533 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
4535 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
4536 or else Scope_Stack
.Table
4537 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
4540 exit when Is_Generic_Instance
(S
)
4541 and then (In_Package_Body
(S
)
4542 or else Ekind
(S
) = E_Procedure
4543 or else Ekind
(S
) = E_Function
);
4547 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
4549 -- Find and save all enclosing instances
4554 and then S
/= Standard_Standard
4556 if Is_Generic_Instance
(S
) then
4557 N_Instances
:= N_Instances
+ 1;
4558 Instances
(N_Instances
) := S
;
4560 exit when In_Package_Body
(S
);
4566 -- Remove context of current compilation unit, unless we are within a
4567 -- nested package instantiation, in which case the context has been
4568 -- removed previously.
4570 -- If current scope is the body of a child unit, remove context of
4571 -- spec as well. If an enclosing scope is an instance body, the
4572 -- context has already been removed, but the entities in the body
4573 -- must be made invisible as well.
4578 and then S
/= Standard_Standard
4580 if Is_Generic_Instance
(S
)
4581 and then (In_Package_Body
(S
)
4582 or else Ekind_In
(S
, E_Procedure
, E_Function
))
4584 -- We still have to remove the entities of the enclosing
4585 -- instance from direct visibility.
4590 E
:= First_Entity
(S
);
4591 while Present
(E
) loop
4592 Set_Is_Immediately_Visible
(E
, False);
4601 or else (Ekind
(Curr_Unit
) = E_Package_Body
4602 and then S
= Spec_Entity
(Curr_Unit
))
4603 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
4606 (Unit_Declaration_Node
(Curr_Unit
)))
4610 -- Remove entities in current scopes from visibility, so that
4611 -- instance body is compiled in a clean environment.
4613 List
:= Save_Scope_Stack
(Handle_Use
=> False);
4615 if Is_Child_Unit
(S
) then
4617 -- Remove child unit from stack, as well as inner scopes.
4618 -- Removing the context of a child unit removes parent units
4621 while Current_Scope
/= S
loop
4622 Num_Inner
:= Num_Inner
+ 1;
4623 Inner_Scopes
(Num_Inner
) := Current_Scope
;
4628 Remove_Context
(Curr_Comp
);
4632 Remove_Context
(Curr_Comp
);
4635 if Ekind
(Curr_Unit
) = E_Package_Body
then
4636 Remove_Context
(Library_Unit
(Curr_Comp
));
4643 pragma Assert
(Num_Inner
< Num_Scopes
);
4645 -- The inlined package body must be analyzed with the SPARK_Mode of
4646 -- the enclosing context, otherwise the body may cause bogus errors
4647 -- if a configuration SPARK_Mode pragma in in effect.
4649 Push_Scope
(Standard_Standard
);
4650 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
4651 Instantiate_Package_Body
4654 Act_Decl
=> Act_Decl
,
4655 Expander_Status
=> Expander_Active
,
4656 Current_Sem_Unit
=> Current_Sem_Unit
,
4657 Scope_Suppress
=> Scope_Suppress
,
4658 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4659 Version
=> Ada_Version
,
4660 Version_Pragma
=> Ada_Version_Pragma
,
4661 Warnings
=> Save_Warnings
,
4662 SPARK_Mode
=> Save_SM
,
4663 SPARK_Mode_Pragma
=> Save_SMP
)),
4664 Inlined_Body
=> True);
4670 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
4672 -- Reset Generic_Instance flag so that use clauses can be installed
4673 -- in the proper order. (See Use_One_Package for effect of enclosing
4674 -- instances on processing of use clauses).
4676 for J
in 1 .. N_Instances
loop
4677 Set_Is_Generic_Instance
(Instances
(J
), False);
4681 Install_Context
(Curr_Comp
);
4683 if Present
(Curr_Scope
)
4684 and then Is_Child_Unit
(Curr_Scope
)
4686 Push_Scope
(Curr_Scope
);
4687 Set_Is_Immediately_Visible
(Curr_Scope
);
4689 -- Finally, restore inner scopes as well
4691 for J
in reverse 1 .. Num_Inner
loop
4692 Push_Scope
(Inner_Scopes
(J
));
4696 Restore_Scope_Stack
(List
, Handle_Use
=> False);
4698 if Present
(Curr_Scope
)
4700 (In_Private_Part
(Curr_Scope
)
4701 or else In_Package_Body
(Curr_Scope
))
4703 -- Install private declaration of ancestor units, which are
4704 -- currently available. Restore_Scope_Stack and Install_Context
4705 -- only install the visible part of parents.
4710 Par
:= Scope
(Curr_Scope
);
4711 while (Present
(Par
))
4712 and then Par
/= Standard_Standard
4714 Install_Private_Declarations
(Par
);
4721 -- Restore use clauses. For a child unit, use clauses in the parents
4722 -- are restored when installing the context, so only those in inner
4723 -- scopes (and those local to the child unit itself) need to be
4724 -- installed explicitly.
4726 if Is_Child_Unit
(Curr_Unit
)
4729 for J
in reverse 1 .. Num_Inner
+ 1 loop
4730 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4732 Install_Use_Clauses
(Use_Clauses
(J
));
4736 for J
in reverse 1 .. Num_Scopes
loop
4737 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4739 Install_Use_Clauses
(Use_Clauses
(J
));
4743 -- Restore status of instances. If one of them is a body, make its
4744 -- local entities visible again.
4751 for J
in 1 .. N_Instances
loop
4752 Inst
:= Instances
(J
);
4753 Set_Is_Generic_Instance
(Inst
, True);
4755 if In_Package_Body
(Inst
)
4756 or else Ekind_In
(S
, E_Procedure
, E_Function
)
4758 E
:= First_Entity
(Instances
(J
));
4759 while Present
(E
) loop
4760 Set_Is_Immediately_Visible
(E
);
4767 -- If generic unit is in current unit, current context is correct. Note
4768 -- that the context is guaranteed to carry the correct SPARK_Mode as no
4769 -- enclosing scopes were removed.
4772 Instantiate_Package_Body
4775 Act_Decl
=> Act_Decl
,
4776 Expander_Status
=> Expander_Active
,
4777 Current_Sem_Unit
=> Current_Sem_Unit
,
4778 Scope_Suppress
=> Scope_Suppress
,
4779 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4780 Version
=> Ada_Version
,
4781 Version_Pragma
=> Ada_Version_Pragma
,
4782 Warnings
=> Save_Warnings
,
4783 SPARK_Mode
=> SPARK_Mode
,
4784 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
4785 Inlined_Body
=> True);
4787 end Inline_Instance_Body
;
4789 -------------------------------------
4790 -- Analyze_Procedure_Instantiation --
4791 -------------------------------------
4793 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
4795 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
4796 end Analyze_Procedure_Instantiation
;
4798 -----------------------------------
4799 -- Need_Subprogram_Instance_Body --
4800 -----------------------------------
4802 function Need_Subprogram_Instance_Body
4804 Subp
: Entity_Id
) return Boolean
4807 -- Must be inlined (or inlined renaming)
4809 if (Is_In_Main_Unit
(N
)
4810 or else Is_Inlined
(Subp
)
4811 or else Is_Inlined
(Alias
(Subp
)))
4813 -- Must be generating code or analyzing code in ASIS/GNATprove mode
4815 and then (Operating_Mode
= Generate_Code
4816 or else (Operating_Mode
= Check_Semantics
4817 and then (ASIS_Mode
or GNATprove_Mode
)))
4819 -- The body is needed when generating code (full expansion), in ASIS
4820 -- mode for other tools, and in GNATprove mode (special expansion) for
4821 -- formal verification of the body itself.
4823 and then (Expander_Active
or ASIS_Mode
or GNATprove_Mode
)
4825 -- No point in inlining if ABE is inevitable
4827 and then not ABE_Is_Certain
(N
)
4829 -- Or if subprogram is eliminated
4831 and then not Is_Eliminated
(Subp
)
4833 Pending_Instantiations
.Append
4835 Act_Decl
=> Unit_Declaration_Node
(Subp
),
4836 Expander_Status
=> Expander_Active
,
4837 Current_Sem_Unit
=> Current_Sem_Unit
,
4838 Scope_Suppress
=> Scope_Suppress
,
4839 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4840 Version
=> Ada_Version
,
4841 Version_Pragma
=> Ada_Version_Pragma
,
4842 Warnings
=> Save_Warnings
,
4843 SPARK_Mode
=> SPARK_Mode
,
4844 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
4847 -- Here if not inlined, or we ignore the inlining
4852 end Need_Subprogram_Instance_Body
;
4854 --------------------------------------
4855 -- Analyze_Subprogram_Instantiation --
4856 --------------------------------------
4858 procedure Analyze_Subprogram_Instantiation
4862 Loc
: constant Source_Ptr
:= Sloc
(N
);
4863 Gen_Id
: constant Node_Id
:= Name
(N
);
4865 Anon_Id
: constant Entity_Id
:=
4866 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
4867 Chars
=> New_External_Name
4868 (Chars
(Defining_Entity
(N
)), 'R'));
4870 Act_Decl_Id
: Entity_Id
;
4875 Env_Installed
: Boolean := False;
4876 Gen_Unit
: Entity_Id
;
4878 Pack_Id
: Entity_Id
;
4879 Parent_Installed
: Boolean := False;
4880 Renaming_List
: List_Id
;
4882 procedure Analyze_Instance_And_Renamings
;
4883 -- The instance must be analyzed in a context that includes the mappings
4884 -- of generic parameters into actuals. We create a package declaration
4885 -- for this purpose, and a subprogram with an internal name within the
4886 -- package. The subprogram instance is simply an alias for the internal
4887 -- subprogram, declared in the current scope.
4889 ------------------------------------
4890 -- Analyze_Instance_And_Renamings --
4891 ------------------------------------
4893 procedure Analyze_Instance_And_Renamings
is
4894 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
4895 Pack_Decl
: Node_Id
;
4898 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4900 -- For the case of a compilation unit, the container package has
4901 -- the same name as the instantiation, to insure that the binder
4902 -- calls the elaboration procedure with the right name. Copy the
4903 -- entity of the instance, which may have compilation level flags
4904 -- (e.g. Is_Child_Unit) set.
4906 Pack_Id
:= New_Copy
(Def_Ent
);
4909 -- Otherwise we use the name of the instantiation concatenated
4910 -- with its source position to ensure uniqueness if there are
4911 -- several instantiations with the same name.
4914 Make_Defining_Identifier
(Loc
,
4915 Chars
=> New_External_Name
4916 (Related_Id
=> Chars
(Def_Ent
),
4918 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
4921 Pack_Decl
:= Make_Package_Declaration
(Loc
,
4922 Specification
=> Make_Package_Specification
(Loc
,
4923 Defining_Unit_Name
=> Pack_Id
,
4924 Visible_Declarations
=> Renaming_List
,
4925 End_Label
=> Empty
));
4927 Set_Instance_Spec
(N
, Pack_Decl
);
4928 Set_Is_Generic_Instance
(Pack_Id
);
4929 Set_Debug_Info_Needed
(Pack_Id
);
4931 -- Case of not a compilation unit
4933 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4934 Mark_Rewrite_Insertion
(Pack_Decl
);
4935 Insert_Before
(N
, Pack_Decl
);
4936 Set_Has_Completion
(Pack_Id
);
4938 -- Case of an instantiation that is a compilation unit
4940 -- Place declaration on current node so context is complete for
4941 -- analysis (including nested instantiations), and for use in a
4942 -- context_clause (see Analyze_With_Clause).
4945 Set_Unit
(Parent
(N
), Pack_Decl
);
4946 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
4949 Analyze
(Pack_Decl
);
4950 Check_Formal_Packages
(Pack_Id
);
4951 Set_Is_Generic_Instance
(Pack_Id
, False);
4953 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4956 -- Body of the enclosing package is supplied when instantiating the
4957 -- subprogram body, after semantic analysis is completed.
4959 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4961 -- Remove package itself from visibility, so it does not
4962 -- conflict with subprogram.
4964 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
4966 -- Set name and scope of internal subprogram so that the proper
4967 -- external name will be generated. The proper scope is the scope
4968 -- of the wrapper package. We need to generate debugging info for
4969 -- the internal subprogram, so set flag accordingly.
4971 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
4972 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
4974 -- Mark wrapper package as referenced, to avoid spurious warnings
4975 -- if the instantiation appears in various with_ clauses of
4976 -- subunits of the main unit.
4978 Set_Referenced
(Pack_Id
);
4981 Set_Is_Generic_Instance
(Anon_Id
);
4982 Set_Debug_Info_Needed
(Anon_Id
);
4983 Act_Decl_Id
:= New_Copy
(Anon_Id
);
4985 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
4986 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
4987 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
4988 Set_Comes_From_Source
(Act_Decl_Id
, True);
4990 -- The signature may involve types that are not frozen yet, but the
4991 -- subprogram will be frozen at the point the wrapper package is
4992 -- frozen, so it does not need its own freeze node. In fact, if one
4993 -- is created, it might conflict with the freezing actions from the
4996 Set_Has_Delayed_Freeze
(Anon_Id
, False);
4998 -- If the instance is a child unit, mark the Id accordingly. Mark
4999 -- the anonymous entity as well, which is the real subprogram and
5000 -- which is used when the instance appears in a context clause.
5001 -- Similarly, propagate the Is_Eliminated flag to handle properly
5002 -- nested eliminated subprograms.
5004 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5005 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5006 New_Overloaded_Entity
(Act_Decl_Id
);
5007 Check_Eliminated
(Act_Decl_Id
);
5008 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5010 -- In compilation unit case, kill elaboration checks on the
5011 -- instantiation, since they are never needed -- the body is
5012 -- instantiated at the same point as the spec.
5014 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5015 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5016 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5017 Set_Is_Compilation_Unit
(Anon_Id
);
5019 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5022 -- The instance is not a freezing point for the new subprogram
5024 Set_Is_Frozen
(Act_Decl_Id
, False);
5026 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5027 Valid_Operator_Definition
(Act_Decl_Id
);
5030 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5031 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5032 Set_Has_Completion
(Act_Decl_Id
);
5033 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5035 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5036 Set_Body_Required
(Parent
(N
), False);
5038 end Analyze_Instance_And_Renamings
;
5042 Save_IPSM
: constant Boolean := Ignore_Pragma_SPARK_Mode
;
5043 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
5045 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5046 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5047 -- Save the SPARK_Mode-related data for restore on exit
5049 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5050 -- List of primitives made temporarily visible in the instantiation
5051 -- to match the visibility of the formal type
5053 -- Start of processing for Analyze_Subprogram_Instantiation
5056 Check_SPARK_05_Restriction
("generic is not allowed", N
);
5058 -- Very first thing: check for special Text_IO unit in case we are
5059 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5060 -- such an instantiation is bogus (these are packages, not subprograms),
5061 -- but we get a better error message if we do this.
5063 Check_Text_IO_Special_Unit
(Gen_Id
);
5065 -- Make node global for error reporting
5067 Instantiation_Node
:= N
;
5069 -- For package instantiations we turn off style checks, because they
5070 -- will have been emitted in the generic. For subprogram instantiations
5071 -- we want to apply at least the check on overriding indicators so we
5072 -- do not modify the style check status.
5074 -- The renaming declarations for the actuals do not come from source and
5075 -- will not generate spurious warnings.
5077 Preanalyze_Actuals
(N
);
5080 Env_Installed
:= True;
5081 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5082 Gen_Unit
:= Entity
(Gen_Id
);
5084 Generate_Reference
(Gen_Unit
, Gen_Id
);
5086 if Nkind
(Gen_Id
) = N_Identifier
5087 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5090 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5093 if Etype
(Gen_Unit
) = Any_Type
then
5098 -- Verify that it is a generic subprogram of the right kind, and that
5099 -- it does not lead to a circular instantiation.
5101 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5103 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5105 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5107 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5109 elsif In_Open_Scopes
(Gen_Unit
) then
5110 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5113 -- If the context of the instance is subject to SPARK_Mode "off",
5114 -- set the global flag which signals Analyze_Pragma to ignore all
5115 -- SPARK_Mode pragmas within the instance.
5117 if SPARK_Mode
= Off
then
5118 Ignore_Pragma_SPARK_Mode
:= True;
5121 Set_Entity
(Gen_Id
, Gen_Unit
);
5122 Set_Is_Instantiated
(Gen_Unit
);
5124 if In_Extended_Main_Source_Unit
(N
) then
5125 Generate_Reference
(Gen_Unit
, N
);
5128 -- If renaming, get original unit
5130 if Present
(Renamed_Object
(Gen_Unit
))
5131 and then Ekind_In
(Renamed_Object
(Gen_Unit
), E_Generic_Procedure
,
5134 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
5135 Set_Is_Instantiated
(Gen_Unit
);
5136 Generate_Reference
(Gen_Unit
, N
);
5139 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5140 Error_Msg_Node_2
:= Current_Scope
;
5142 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
5143 Circularity_Detected
:= True;
5144 Restore_Hidden_Primitives
(Vis_Prims_List
);
5148 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5150 -- Initialize renamings map, for error checking
5152 Generic_Renamings
.Set_Last
(0);
5153 Generic_Renamings_HTable
.Reset
;
5155 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
5157 -- Copy original generic tree, to produce text for instantiation
5161 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5163 -- Inherit overriding indicator from instance node
5165 Act_Spec
:= Specification
(Act_Tree
);
5166 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5167 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5170 Analyze_Associations
5172 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5173 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5175 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5177 -- The subprogram itself cannot contain a nested instance, so the
5178 -- current parent is left empty.
5180 Set_Instance_Env
(Gen_Unit
, Empty
);
5182 -- Build the subprogram declaration, which does not appear in the
5183 -- generic template, and give it a sloc consistent with that of the
5186 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5187 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5189 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5190 Specification
=> Act_Spec
);
5192 -- The aspects have been copied previously, but they have to be
5193 -- linked explicitly to the new subprogram declaration. Explicit
5194 -- pre/postconditions on the instance are analyzed below, in a
5197 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5198 Set_Categorization_From_Pragmas
(Act_Decl
);
5200 if Parent_Installed
then
5204 Append
(Act_Decl
, Renaming_List
);
5205 Analyze_Instance_And_Renamings
;
5207 -- If the generic is marked Import (Intrinsic), then so is the
5208 -- instance. This indicates that there is no body to instantiate. If
5209 -- generic is marked inline, so it the instance, and the anonymous
5210 -- subprogram it renames. If inlined, or else if inlining is enabled
5211 -- for the compilation, we generate the instance body even if it is
5212 -- not within the main unit.
5214 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5215 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5216 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5218 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5219 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5223 -- Inherit convention from generic unit. Intrinsic convention, as for
5224 -- an instance of unchecked conversion, is not inherited because an
5225 -- explicit Ada instance has been created.
5227 if Has_Convention_Pragma
(Gen_Unit
)
5228 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5230 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5231 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5234 Generate_Definition
(Act_Decl_Id
);
5235 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
5237 Set_Contract
(Act_Decl_Id
, Make_Contract
(Sloc
(Act_Decl_Id
)));
5239 -- Inherit all inlining-related flags which apply to the generic in
5240 -- the subprogram and its declaration.
5242 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5243 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5245 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5246 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5248 Set_Has_Pragma_Inline_Always
5249 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5250 Set_Has_Pragma_Inline_Always
5251 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5253 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
5254 Check_Elab_Instantiation
(N
);
5257 if Is_Dispatching_Operation
(Act_Decl_Id
)
5258 and then Ada_Version
>= Ada_2005
5264 Formal
:= First_Formal
(Act_Decl_Id
);
5265 while Present
(Formal
) loop
5266 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
5267 and then Is_Controlling_Formal
(Formal
)
5268 and then not Can_Never_Be_Null
(Formal
)
5270 Error_Msg_NE
("access parameter& is controlling,",
5273 ("\corresponding parameter of & must be"
5274 & " explicitly null-excluding", N
, Gen_Id
);
5277 Next_Formal
(Formal
);
5282 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
5284 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5286 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
5287 Inherit_Context
(Gen_Decl
, N
);
5289 Restore_Private_Views
(Pack_Id
, False);
5291 -- If the context requires a full instantiation, mark node for
5292 -- subsequent construction of the body.
5294 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
5295 Check_Forward_Instantiation
(Gen_Decl
);
5297 -- The wrapper package is always delayed, because it does not
5298 -- constitute a freeze point, but to insure that the freeze
5299 -- node is placed properly, it is created directly when
5300 -- instantiating the body (otherwise the freeze node might
5301 -- appear to early for nested instantiations).
5303 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5305 -- For ASIS purposes, indicate that the wrapper package has
5306 -- replaced the instantiation node.
5308 Rewrite
(N
, Unit
(Parent
(N
)));
5309 Set_Unit
(Parent
(N
), N
);
5312 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5314 -- Replace instance node for library-level instantiations of
5315 -- intrinsic subprograms, for ASIS use.
5317 Rewrite
(N
, Unit
(Parent
(N
)));
5318 Set_Unit
(Parent
(N
), N
);
5321 if Parent_Installed
then
5325 Restore_Hidden_Primitives
(Vis_Prims_List
);
5327 Env_Installed
:= False;
5328 Generic_Renamings
.Set_Last
(0);
5329 Generic_Renamings_HTable
.Reset
;
5331 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
5332 SPARK_Mode
:= Save_SM
;
5333 SPARK_Mode_Pragma
:= Save_SMP
;
5337 if Has_Aspects
(N
) then
5338 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5342 when Instantiation_Error
=>
5343 if Parent_Installed
then
5347 if Env_Installed
then
5351 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
5352 SPARK_Mode
:= Save_SM
;
5353 SPARK_Mode_Pragma
:= Save_SMP
;
5354 end Analyze_Subprogram_Instantiation
;
5356 -------------------------
5357 -- Get_Associated_Node --
5358 -------------------------
5360 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
5364 Assoc
:= Associated_Node
(N
);
5366 if Nkind
(Assoc
) /= Nkind
(N
) then
5369 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
5373 -- If the node is part of an inner generic, it may itself have been
5374 -- remapped into a further generic copy. Associated_Node is otherwise
5375 -- used for the entity of the node, and will be of a different node
5376 -- kind, or else N has been rewritten as a literal or function call.
5378 while Present
(Associated_Node
(Assoc
))
5379 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
5381 Assoc
:= Associated_Node
(Assoc
);
5384 -- Follow and additional link in case the final node was rewritten.
5385 -- This can only happen with nested generic units.
5387 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
5388 and then Present
(Associated_Node
(Assoc
))
5389 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
5390 N_Explicit_Dereference
,
5395 Assoc
:= Associated_Node
(Assoc
);
5398 -- An additional special case: an unconstrained type in an object
5399 -- declaration may have been rewritten as a local subtype constrained
5400 -- by the expression in the declaration. We need to recover the
5401 -- original entity which may be global.
5403 if Present
(Original_Node
(Assoc
))
5404 and then Nkind
(Parent
(N
)) = N_Object_Declaration
5406 Assoc
:= Original_Node
(Assoc
);
5411 end Get_Associated_Node
;
5413 -------------------------------------------
5414 -- Build_Instance_Compilation_Unit_Nodes --
5415 -------------------------------------------
5417 procedure Build_Instance_Compilation_Unit_Nodes
5422 Decl_Cunit
: Node_Id
;
5423 Body_Cunit
: Node_Id
;
5425 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
5426 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
5429 -- A new compilation unit node is built for the instance declaration
5432 Make_Compilation_Unit
(Sloc
(N
),
5433 Context_Items
=> Empty_List
,
5435 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
5437 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
5439 -- The new compilation unit is linked to its body, but both share the
5440 -- same file, so we do not set Body_Required on the new unit so as not
5441 -- to create a spurious dependency on a non-existent body in the ali.
5442 -- This simplifies CodePeer unit traversal.
5444 -- We use the original instantiation compilation unit as the resulting
5445 -- compilation unit of the instance, since this is the main unit.
5447 Rewrite
(N
, Act_Body
);
5449 -- Propagate the aspect specifications from the package body template to
5450 -- the instantiated version of the package body.
5452 if Has_Aspects
(Act_Body
) then
5453 Set_Aspect_Specifications
5454 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
5457 Body_Cunit
:= Parent
(N
);
5459 -- The two compilation unit nodes are linked by the Library_Unit field
5461 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
5462 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
5464 -- Preserve the private nature of the package if needed
5466 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
5468 -- If the instance is not the main unit, its context, categorization
5469 -- and elaboration entity are not relevant to the compilation.
5471 if Body_Cunit
/= Cunit
(Main_Unit
) then
5472 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
5476 -- The context clause items on the instantiation, which are now attached
5477 -- to the body compilation unit (since the body overwrote the original
5478 -- instantiation node), semantically belong on the spec, so copy them
5479 -- there. It's harmless to leave them on the body as well. In fact one
5480 -- could argue that they belong in both places.
5482 Citem
:= First
(Context_Items
(Body_Cunit
));
5483 while Present
(Citem
) loop
5484 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
5488 -- Propagate categorization flags on packages, so that they appear in
5489 -- the ali file for the spec of the unit.
5491 if Ekind
(New_Main
) = E_Package
then
5492 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
5493 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
5494 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
5495 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
5496 Set_Is_Remote_Call_Interface
5497 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
5500 -- Make entry in Units table, so that binder can generate call to
5501 -- elaboration procedure for body, if any.
5503 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
5504 Main_Unit_Entity
:= New_Main
;
5505 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
5507 -- Build elaboration entity, since the instance may certainly generate
5508 -- elaboration code requiring a flag for protection.
5510 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
5511 end Build_Instance_Compilation_Unit_Nodes
;
5513 -----------------------------
5514 -- Check_Access_Definition --
5515 -----------------------------
5517 procedure Check_Access_Definition
(N
: Node_Id
) is
5520 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
5522 end Check_Access_Definition
;
5524 -----------------------------------
5525 -- Check_Formal_Package_Instance --
5526 -----------------------------------
5528 -- If the formal has specific parameters, they must match those of the
5529 -- actual. Both of them are instances, and the renaming declarations for
5530 -- their formal parameters appear in the same order in both. The analyzed
5531 -- formal has been analyzed in the context of the current instance.
5533 procedure Check_Formal_Package_Instance
5534 (Formal_Pack
: Entity_Id
;
5535 Actual_Pack
: Entity_Id
)
5537 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
5538 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
5543 procedure Check_Mismatch
(B
: Boolean);
5544 -- Common error routine for mismatch between the parameters of the
5545 -- actual instance and those of the formal package.
5547 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
5548 -- The formal may come from a nested formal package, and the actual may
5549 -- have been constant-folded. To determine whether the two denote the
5550 -- same entity we may have to traverse several definitions to recover
5551 -- the ultimate entity that they refer to.
5553 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
5554 -- Similarly, if the formal comes from a nested formal package, the
5555 -- actual may designate the formal through multiple renamings, which
5556 -- have to be followed to determine the original variable in question.
5558 --------------------
5559 -- Check_Mismatch --
5560 --------------------
5562 procedure Check_Mismatch
(B
: Boolean) is
5563 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
5566 if Kind
= N_Formal_Type_Declaration
then
5569 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
5570 N_Formal_Package_Declaration
)
5571 or else Kind
in N_Formal_Subprogram_Declaration
5577 ("actual for & in actual instance does not match formal",
5578 Parent
(Actual_Pack
), E1
);
5582 --------------------------------
5583 -- Same_Instantiated_Constant --
5584 --------------------------------
5586 function Same_Instantiated_Constant
5587 (E1
, E2
: Entity_Id
) return Boolean
5593 while Present
(Ent
) loop
5597 elsif Ekind
(Ent
) /= E_Constant
then
5600 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
5601 if Entity
(Constant_Value
(Ent
)) = E1
then
5604 Ent
:= Entity
(Constant_Value
(Ent
));
5607 -- The actual may be a constant that has been folded. Recover
5610 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
5611 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
5618 end Same_Instantiated_Constant
;
5620 --------------------------------
5621 -- Same_Instantiated_Variable --
5622 --------------------------------
5624 function Same_Instantiated_Variable
5625 (E1
, E2
: Entity_Id
) return Boolean
5627 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
5628 -- Follow chain of renamings to the ultimate ancestor
5630 ---------------------
5631 -- Original_Entity --
5632 ---------------------
5634 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
5639 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
5640 and then Present
(Renamed_Object
(Orig
))
5641 and then Is_Entity_Name
(Renamed_Object
(Orig
))
5643 Orig
:= Entity
(Renamed_Object
(Orig
));
5647 end Original_Entity
;
5649 -- Start of processing for Same_Instantiated_Variable
5652 return Ekind
(E1
) = Ekind
(E2
)
5653 and then Original_Entity
(E1
) = Original_Entity
(E2
);
5654 end Same_Instantiated_Variable
;
5656 -- Start of processing for Check_Formal_Package_Instance
5660 and then Present
(E2
)
5662 exit when Ekind
(E1
) = E_Package
5663 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
5665 -- If the formal is the renaming of the formal package, this
5666 -- is the end of its formal part, which may occur before the
5667 -- end of the formal part in the actual in the presence of
5668 -- defaulted parameters in the formal package.
5670 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
5671 and then Renamed_Entity
(E2
) = Scope
(E2
);
5673 -- The analysis of the actual may generate additional internal
5674 -- entities. If the formal is defaulted, there is no corresponding
5675 -- analysis and the internal entities must be skipped, until we
5676 -- find corresponding entities again.
5678 if Comes_From_Source
(E2
)
5679 and then not Comes_From_Source
(E1
)
5680 and then Chars
(E1
) /= Chars
(E2
)
5683 and then Chars
(E1
) /= Chars
(E2
)
5692 -- If the formal entity comes from a formal declaration, it was
5693 -- defaulted in the formal package, and no check is needed on it.
5695 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
5698 -- Ditto for defaulted formal subprograms.
5700 elsif Is_Overloadable
(E1
)
5701 and then Nkind
(Unit_Declaration_Node
(E2
)) in
5702 N_Formal_Subprogram_Declaration
5706 elsif Is_Type
(E1
) then
5708 -- Subtypes must statically match. E1, E2 are the local entities
5709 -- that are subtypes of the actuals. Itypes generated for other
5710 -- parameters need not be checked, the check will be performed
5711 -- on the parameters themselves.
5713 -- If E2 is a formal type declaration, it is a defaulted parameter
5714 -- and needs no checking.
5716 if not Is_Itype
(E1
)
5717 and then not Is_Itype
(E2
)
5721 or else Etype
(E1
) /= Etype
(E2
)
5722 or else not Subtypes_Statically_Match
(E1
, E2
));
5725 elsif Ekind
(E1
) = E_Constant
then
5727 -- IN parameters must denote the same static value, or the same
5728 -- constant, or the literal null.
5730 Expr1
:= Expression
(Parent
(E1
));
5732 if Ekind
(E2
) /= E_Constant
then
5733 Check_Mismatch
(True);
5736 Expr2
:= Expression
(Parent
(E2
));
5739 if Is_OK_Static_Expression
(Expr1
) then
5740 if not Is_OK_Static_Expression
(Expr2
) then
5741 Check_Mismatch
(True);
5743 elsif Is_Discrete_Type
(Etype
(E1
)) then
5745 V1
: constant Uint
:= Expr_Value
(Expr1
);
5746 V2
: constant Uint
:= Expr_Value
(Expr2
);
5748 Check_Mismatch
(V1
/= V2
);
5751 elsif Is_Real_Type
(Etype
(E1
)) then
5753 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
5754 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
5756 Check_Mismatch
(V1
/= V2
);
5759 elsif Is_String_Type
(Etype
(E1
))
5760 and then Nkind
(Expr1
) = N_String_Literal
5762 if Nkind
(Expr2
) /= N_String_Literal
then
5763 Check_Mismatch
(True);
5766 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
5770 elsif Is_Entity_Name
(Expr1
) then
5771 if Is_Entity_Name
(Expr2
) then
5772 if Entity
(Expr1
) = Entity
(Expr2
) then
5776 (not Same_Instantiated_Constant
5777 (Entity
(Expr1
), Entity
(Expr2
)));
5780 Check_Mismatch
(True);
5783 elsif Is_Entity_Name
(Original_Node
(Expr1
))
5784 and then Is_Entity_Name
(Expr2
)
5786 Same_Instantiated_Constant
5787 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
5791 elsif Nkind
(Expr1
) = N_Null
then
5792 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
5795 Check_Mismatch
(True);
5798 elsif Ekind
(E1
) = E_Variable
then
5799 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
5801 elsif Ekind
(E1
) = E_Package
then
5803 (Ekind
(E1
) /= Ekind
(E2
)
5804 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
5806 elsif Is_Overloadable
(E1
) then
5808 -- Verify that the actual subprograms match. Note that actuals
5809 -- that are attributes are rewritten as subprograms. If the
5810 -- subprogram in the formal package is defaulted, no check is
5811 -- needed. Note that this can only happen in Ada 2005 when the
5812 -- formal package can be partially parameterized.
5814 if Nkind
(Unit_Declaration_Node
(E1
)) =
5815 N_Subprogram_Renaming_Declaration
5816 and then From_Default
(Unit_Declaration_Node
(E1
))
5820 -- If the formal package has an "others" box association that
5821 -- covers this formal, there is no need for a check either.
5823 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
5824 N_Formal_Subprogram_Declaration
5825 and then Box_Present
(Unit_Declaration_Node
(E2
))
5829 -- No check needed if subprogram is a defaulted null procedure
5831 elsif No
(Alias
(E2
))
5832 and then Ekind
(E2
) = E_Procedure
5834 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
5838 -- Otherwise the actual in the formal and the actual in the
5839 -- instantiation of the formal must match, up to renamings.
5843 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
5847 raise Program_Error
;
5854 end Check_Formal_Package_Instance
;
5856 ---------------------------
5857 -- Check_Formal_Packages --
5858 ---------------------------
5860 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
5862 Formal_P
: Entity_Id
;
5865 -- Iterate through the declarations in the instance, looking for package
5866 -- renaming declarations that denote instances of formal packages. Stop
5867 -- when we find the renaming of the current package itself. The
5868 -- declaration for a formal package without a box is followed by an
5869 -- internal entity that repeats the instantiation.
5871 E
:= First_Entity
(P_Id
);
5872 while Present
(E
) loop
5873 if Ekind
(E
) = E_Package
then
5874 if Renamed_Object
(E
) = P_Id
then
5877 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
5880 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
5881 Formal_P
:= Next_Entity
(E
);
5882 Check_Formal_Package_Instance
(Formal_P
, E
);
5884 -- After checking, remove the internal validating package. It
5885 -- is only needed for semantic checks, and as it may contain
5886 -- generic formal declarations it should not reach gigi.
5888 Remove
(Unit_Declaration_Node
(Formal_P
));
5894 end Check_Formal_Packages
;
5896 ---------------------------------
5897 -- Check_Forward_Instantiation --
5898 ---------------------------------
5900 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
5902 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
5905 -- The instantiation appears before the generic body if we are in the
5906 -- scope of the unit containing the generic, either in its spec or in
5907 -- the package body, and before the generic body.
5909 if Ekind
(Gen_Comp
) = E_Package_Body
then
5910 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
5913 if In_Open_Scopes
(Gen_Comp
)
5914 and then No
(Corresponding_Body
(Decl
))
5919 and then not Is_Compilation_Unit
(S
)
5920 and then not Is_Child_Unit
(S
)
5922 if Ekind
(S
) = E_Package
then
5923 Set_Has_Forward_Instantiation
(S
);
5929 end Check_Forward_Instantiation
;
5931 ---------------------------
5932 -- Check_Generic_Actuals --
5933 ---------------------------
5935 -- The visibility of the actuals may be different between the point of
5936 -- generic instantiation and the instantiation of the body.
5938 procedure Check_Generic_Actuals
5939 (Instance
: Entity_Id
;
5940 Is_Formal_Box
: Boolean)
5945 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
5946 -- For a formal that is an array type, the component type is often a
5947 -- previous formal in the same unit. The privacy status of the component
5948 -- type will have been examined earlier in the traversal of the
5949 -- corresponding actuals, and this status should not be modified for
5950 -- the array (sub)type itself. However, if the base type of the array
5951 -- (sub)type is private, its full view must be restored in the body to
5952 -- be consistent with subsequent index subtypes, etc.
5954 -- To detect this case we have to rescan the list of formals, which is
5955 -- usually short enough to ignore the resulting inefficiency.
5957 -----------------------------
5958 -- Denotes_Previous_Actual --
5959 -----------------------------
5961 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
5965 Prev
:= First_Entity
(Instance
);
5966 while Present
(Prev
) loop
5968 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
5969 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
5970 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
5983 end Denotes_Previous_Actual
;
5985 -- Start of processing for Check_Generic_Actuals
5988 E
:= First_Entity
(Instance
);
5989 while Present
(E
) loop
5991 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
5992 and then Scope
(Etype
(E
)) /= Instance
5993 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
5995 if Is_Array_Type
(E
)
5996 and then not Is_Private_Type
(Etype
(E
))
5997 and then Denotes_Previous_Actual
(Component_Type
(E
))
6001 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
6004 Set_Is_Generic_Actual_Type
(E
, True);
6005 Set_Is_Hidden
(E
, False);
6006 Set_Is_Potentially_Use_Visible
(E
,
6009 -- We constructed the generic actual type as a subtype of the
6010 -- supplied type. This means that it normally would not inherit
6011 -- subtype specific attributes of the actual, which is wrong for
6012 -- the generic case.
6014 Astype
:= Ancestor_Subtype
(E
);
6018 -- This can happen when E is an itype that is the full view of
6019 -- a private type completed, e.g. with a constrained array. In
6020 -- that case, use the first subtype, which will carry size
6021 -- information. The base type itself is unconstrained and will
6024 Astype
:= First_Subtype
(E
);
6027 Set_Size_Info
(E
, (Astype
));
6028 Set_RM_Size
(E
, RM_Size
(Astype
));
6029 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
6031 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
6032 Set_RM_Size
(E
, RM_Size
(Astype
));
6034 -- In nested instances, the base type of an access actual may
6035 -- itself be private, and need to be exchanged.
6037 elsif Is_Access_Type
(E
)
6038 and then Is_Private_Type
(Etype
(E
))
6041 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
6044 elsif Ekind
(E
) = E_Package
then
6046 -- If this is the renaming for the current instance, we're done.
6047 -- Otherwise it is a formal package. If the corresponding formal
6048 -- was declared with a box, the (instantiations of the) generic
6049 -- formal part are also visible. Otherwise, ignore the entity
6050 -- created to validate the actuals.
6052 if Renamed_Object
(E
) = Instance
then
6055 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6058 -- The visibility of a formal of an enclosing generic is already
6061 elsif Denotes_Formal_Package
(E
) then
6064 elsif Present
(Associated_Formal_Package
(E
))
6065 and then not Is_Generic_Formal
(E
)
6067 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
6068 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6071 Check_Generic_Actuals
(Renamed_Object
(E
), False);
6074 Set_Is_Hidden
(E
, False);
6077 -- If this is a subprogram instance (in a wrapper package) the
6078 -- actual is fully visible.
6080 elsif Is_Wrapper_Package
(Instance
) then
6081 Set_Is_Hidden
(E
, False);
6083 -- If the formal package is declared with a box, or if the formal
6084 -- parameter is defaulted, it is visible in the body.
6086 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
6087 Set_Is_Hidden
(E
, False);
6090 if Ekind
(E
) = E_Constant
then
6092 -- If the type of the actual is a private type declared in the
6093 -- enclosing scope of the generic unit, the body of the generic
6094 -- sees the full view of the type (because it has to appear in
6095 -- the corresponding package body). If the type is private now,
6096 -- exchange views to restore the proper visiblity in the instance.
6099 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
6100 -- The type of the actual
6105 Parent_Scope
: Entity_Id
;
6106 -- The enclosing scope of the generic unit
6109 if Is_Wrapper_Package
(Instance
) then
6113 (Unit_Declaration_Node
6114 (Related_Instance
(Instance
))));
6117 Generic_Parent
(Package_Specification
(Instance
));
6120 Parent_Scope
:= Scope
(Gen_Id
);
6122 -- The exchange is only needed if the generic is defined
6123 -- within a package which is not a common ancestor of the
6124 -- scope of the instance, and is not already in scope.
6126 if Is_Private_Type
(Typ
)
6127 and then Scope
(Typ
) = Parent_Scope
6128 and then Scope
(Instance
) /= Parent_Scope
6129 and then Ekind
(Parent_Scope
) = E_Package
6130 and then not Is_Child_Unit
(Gen_Id
)
6134 -- If the type of the entity is a subtype, it may also have
6135 -- to be made visible, together with the base type of its
6136 -- full view, after exchange.
6138 if Is_Private_Type
(Etype
(E
)) then
6139 Switch_View
(Etype
(E
));
6140 Switch_View
(Base_Type
(Etype
(E
)));
6148 end Check_Generic_Actuals
;
6150 ------------------------------
6151 -- Check_Generic_Child_Unit --
6152 ------------------------------
6154 procedure Check_Generic_Child_Unit
6156 Parent_Installed
: in out Boolean)
6158 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
6159 Gen_Par
: Entity_Id
:= Empty
;
6161 Inst_Par
: Entity_Id
;
6164 function Find_Generic_Child
6166 Id
: Node_Id
) return Entity_Id
;
6167 -- Search generic parent for possible child unit with the given name
6169 function In_Enclosing_Instance
return Boolean;
6170 -- Within an instance of the parent, the child unit may be denoted by
6171 -- a simple name, or an abbreviated expanded name. Examine enclosing
6172 -- scopes to locate a possible parent instantiation.
6174 ------------------------
6175 -- Find_Generic_Child --
6176 ------------------------
6178 function Find_Generic_Child
6180 Id
: Node_Id
) return Entity_Id
6185 -- If entity of name is already set, instance has already been
6186 -- resolved, e.g. in an enclosing instantiation.
6188 if Present
(Entity
(Id
)) then
6189 if Scope
(Entity
(Id
)) = Scop
then
6196 E
:= First_Entity
(Scop
);
6197 while Present
(E
) loop
6198 if Chars
(E
) = Chars
(Id
)
6199 and then Is_Child_Unit
(E
)
6201 if Is_Child_Unit
(E
)
6202 and then not Is_Visible_Lib_Unit
(E
)
6205 ("generic child unit& is not visible", Gen_Id
, E
);
6217 end Find_Generic_Child
;
6219 ---------------------------
6220 -- In_Enclosing_Instance --
6221 ---------------------------
6223 function In_Enclosing_Instance
return Boolean is
6224 Enclosing_Instance
: Node_Id
;
6225 Instance_Decl
: Node_Id
;
6228 -- We do not inline any call that contains instantiations, except
6229 -- for instantiations of Unchecked_Conversion, so if we are within
6230 -- an inlined body the current instance does not require parents.
6232 if In_Inlined_Body
then
6233 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
6237 -- Loop to check enclosing scopes
6239 Enclosing_Instance
:= Current_Scope
;
6240 while Present
(Enclosing_Instance
) loop
6241 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
6243 if Ekind
(Enclosing_Instance
) = E_Package
6244 and then Is_Generic_Instance
(Enclosing_Instance
)
6246 (Generic_Parent
(Specification
(Instance_Decl
)))
6248 -- Check whether the generic we are looking for is a child of
6251 E
:= Find_Generic_Child
6252 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
6253 exit when Present
(E
);
6259 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
6271 Make_Expanded_Name
(Loc
,
6273 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
6274 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
6276 Set_Entity
(Gen_Id
, E
);
6277 Set_Etype
(Gen_Id
, Etype
(E
));
6278 Parent_Installed
:= False; -- Already in scope.
6281 end In_Enclosing_Instance
;
6283 -- Start of processing for Check_Generic_Child_Unit
6286 -- If the name of the generic is given by a selected component, it may
6287 -- be the name of a generic child unit, and the prefix is the name of an
6288 -- instance of the parent, in which case the child unit must be visible.
6289 -- If this instance is not in scope, it must be placed there and removed
6290 -- after instantiation, because what is being instantiated is not the
6291 -- original child, but the corresponding child present in the instance
6294 -- If the child is instantiated within the parent, it can be given by
6295 -- a simple name. In this case the instance is already in scope, but
6296 -- the child generic must be recovered from the generic parent as well.
6298 if Nkind
(Gen_Id
) = N_Selected_Component
then
6299 S
:= Selector_Name
(Gen_Id
);
6300 Analyze
(Prefix
(Gen_Id
));
6301 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6303 if Ekind
(Inst_Par
) = E_Package
6304 and then Present
(Renamed_Object
(Inst_Par
))
6306 Inst_Par
:= Renamed_Object
(Inst_Par
);
6309 if Ekind
(Inst_Par
) = E_Package
then
6310 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
6311 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
6313 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
6315 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
6317 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
6320 elsif Ekind
(Inst_Par
) = E_Generic_Package
6321 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
6323 -- A formal package may be a real child package, and not the
6324 -- implicit instance within a parent. In this case the child is
6325 -- not visible and has to be retrieved explicitly as well.
6327 Gen_Par
:= Inst_Par
;
6330 if Present
(Gen_Par
) then
6332 -- The prefix denotes an instantiation. The entity itself may be a
6333 -- nested generic, or a child unit.
6335 E
:= Find_Generic_Child
(Gen_Par
, S
);
6338 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
6339 Set_Entity
(Gen_Id
, E
);
6340 Set_Etype
(Gen_Id
, Etype
(E
));
6342 Set_Etype
(S
, Etype
(E
));
6344 -- Indicate that this is a reference to the parent
6346 if In_Extended_Main_Source_Unit
(Gen_Id
) then
6347 Set_Is_Instantiated
(Inst_Par
);
6350 -- A common mistake is to replicate the naming scheme of a
6351 -- hierarchy by instantiating a generic child directly, rather
6352 -- than the implicit child in a parent instance:
6354 -- generic .. package Gpar is ..
6355 -- generic .. package Gpar.Child is ..
6356 -- package Par is new Gpar ();
6359 -- package Par.Child is new Gpar.Child ();
6360 -- rather than Par.Child
6362 -- In this case the instantiation is within Par, which is an
6363 -- instance, but Gpar does not denote Par because we are not IN
6364 -- the instance of Gpar, so this is illegal. The test below
6365 -- recognizes this particular case.
6367 if Is_Child_Unit
(E
)
6368 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
6369 and then (not In_Instance
6370 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
6374 ("prefix of generic child unit must be instance of parent",
6378 if not In_Open_Scopes
(Inst_Par
)
6379 and then Nkind
(Parent
(Gen_Id
)) not in
6380 N_Generic_Renaming_Declaration
6382 Install_Parent
(Inst_Par
);
6383 Parent_Installed
:= True;
6385 elsif In_Open_Scopes
(Inst_Par
) then
6387 -- If the parent is already installed, install the actuals
6388 -- for its formal packages. This is necessary when the child
6389 -- instance is a child of the parent instance: in this case,
6390 -- the parent is placed on the scope stack but the formal
6391 -- packages are not made visible.
6393 Install_Formal_Packages
(Inst_Par
);
6397 -- If the generic parent does not contain an entity that
6398 -- corresponds to the selector, the instance doesn't either.
6399 -- Analyzing the node will yield the appropriate error message.
6400 -- If the entity is not a child unit, then it is an inner
6401 -- generic in the parent.
6409 if Is_Child_Unit
(Entity
(Gen_Id
))
6411 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6412 and then not In_Open_Scopes
(Inst_Par
)
6414 Install_Parent
(Inst_Par
);
6415 Parent_Installed
:= True;
6417 -- The generic unit may be the renaming of the implicit child
6418 -- present in an instance. In that case the parent instance is
6419 -- obtained from the name of the renamed entity.
6421 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
6422 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
6423 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
6426 Renamed_Package
: constant Node_Id
:=
6427 Name
(Parent
(Entity
(Gen_Id
)));
6429 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
6430 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
6431 Install_Parent
(Inst_Par
);
6432 Parent_Installed
:= True;
6438 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
6440 -- Entity already present, analyze prefix, whose meaning may be
6441 -- an instance in the current context. If it is an instance of
6442 -- a relative within another, the proper parent may still have
6443 -- to be installed, if they are not of the same generation.
6445 Analyze
(Prefix
(Gen_Id
));
6447 -- In the unlikely case that a local declaration hides the name
6448 -- of the parent package, locate it on the homonym chain. If the
6449 -- context is an instance of the parent, the renaming entity is
6452 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6453 while Present
(Inst_Par
)
6454 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
6456 Inst_Par
:= Homonym
(Inst_Par
);
6459 pragma Assert
(Present
(Inst_Par
));
6460 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
6462 if In_Enclosing_Instance
then
6465 elsif Present
(Entity
(Gen_Id
))
6466 and then Is_Child_Unit
(Entity
(Gen_Id
))
6467 and then not In_Open_Scopes
(Inst_Par
)
6469 Install_Parent
(Inst_Par
);
6470 Parent_Installed
:= True;
6473 elsif In_Enclosing_Instance
then
6475 -- The child unit is found in some enclosing scope
6482 -- If this is the renaming of the implicit child in a parent
6483 -- instance, recover the parent name and install it.
6485 if Is_Entity_Name
(Gen_Id
) then
6486 E
:= Entity
(Gen_Id
);
6488 if Is_Generic_Unit
(E
)
6489 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
6490 and then Is_Child_Unit
(Renamed_Object
(E
))
6491 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
6492 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
6495 New_Copy_Tree
(Name
(Parent
(E
))));
6496 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6498 if not In_Open_Scopes
(Inst_Par
) then
6499 Install_Parent
(Inst_Par
);
6500 Parent_Installed
:= True;
6503 -- If it is a child unit of a non-generic parent, it may be
6504 -- use-visible and given by a direct name. Install parent as
6507 elsif Is_Generic_Unit
(E
)
6508 and then Is_Child_Unit
(E
)
6510 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6511 and then not Is_Generic_Unit
(Scope
(E
))
6513 if not In_Open_Scopes
(Scope
(E
)) then
6514 Install_Parent
(Scope
(E
));
6515 Parent_Installed
:= True;
6520 end Check_Generic_Child_Unit
;
6522 -----------------------------
6523 -- Check_Hidden_Child_Unit --
6524 -----------------------------
6526 procedure Check_Hidden_Child_Unit
6528 Gen_Unit
: Entity_Id
;
6529 Act_Decl_Id
: Entity_Id
)
6531 Gen_Id
: constant Node_Id
:= Name
(N
);
6534 if Is_Child_Unit
(Gen_Unit
)
6535 and then Is_Child_Unit
(Act_Decl_Id
)
6536 and then Nkind
(Gen_Id
) = N_Expanded_Name
6537 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
6538 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
6540 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
6542 ("generic unit & is implicitly declared in &",
6543 Defining_Unit_Name
(N
), Gen_Unit
);
6544 Error_Msg_N
("\instance must have different name",
6545 Defining_Unit_Name
(N
));
6547 end Check_Hidden_Child_Unit
;
6549 ------------------------
6550 -- Check_Private_View --
6551 ------------------------
6553 procedure Check_Private_View
(N
: Node_Id
) is
6554 T
: constant Entity_Id
:= Etype
(N
);
6558 -- Exchange views if the type was not private in the generic but is
6559 -- private at the point of instantiation. Do not exchange views if
6560 -- the scope of the type is in scope. This can happen if both generic
6561 -- and instance are sibling units, or if type is defined in a parent.
6562 -- In this case the visibility of the type will be correct for all
6566 BT
:= Base_Type
(T
);
6568 if Is_Private_Type
(T
)
6569 and then not Has_Private_View
(N
)
6570 and then Present
(Full_View
(T
))
6571 and then not In_Open_Scopes
(Scope
(T
))
6573 -- In the generic, the full type was visible. Save the private
6574 -- entity, for subsequent exchange.
6578 elsif Has_Private_View
(N
)
6579 and then not Is_Private_Type
(T
)
6580 and then not Has_Been_Exchanged
(T
)
6581 and then Etype
(Get_Associated_Node
(N
)) /= T
6583 -- Only the private declaration was visible in the generic. If
6584 -- the type appears in a subtype declaration, the subtype in the
6585 -- instance must have a view compatible with that of its parent,
6586 -- which must be exchanged (see corresponding code in Restore_
6587 -- Private_Views). Otherwise, if the type is defined in a parent
6588 -- unit, leave full visibility within instance, which is safe.
6590 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
6591 and then not Is_Private_Type
(Base_Type
(T
))
6592 and then Comes_From_Source
(Base_Type
(T
))
6596 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
6597 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
6599 Prepend_Elmt
(T
, Exchanged_Views
);
6600 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
6603 -- For composite types with inconsistent representation exchange
6604 -- component types accordingly.
6606 elsif Is_Access_Type
(T
)
6607 and then Is_Private_Type
(Designated_Type
(T
))
6608 and then not Has_Private_View
(N
)
6609 and then Present
(Full_View
(Designated_Type
(T
)))
6611 Switch_View
(Designated_Type
(T
));
6613 elsif Is_Array_Type
(T
) then
6614 if Is_Private_Type
(Component_Type
(T
))
6615 and then not Has_Private_View
(N
)
6616 and then Present
(Full_View
(Component_Type
(T
)))
6618 Switch_View
(Component_Type
(T
));
6621 -- The normal exchange mechanism relies on the setting of a
6622 -- flag on the reference in the generic. However, an additional
6623 -- mechanism is needed for types that are not explicitly
6624 -- mentioned in the generic, but may be needed in expanded code
6625 -- in the instance. This includes component types of arrays and
6626 -- designated types of access types. This processing must also
6627 -- include the index types of arrays which we take care of here.
6634 Indx
:= First_Index
(T
);
6635 while Present
(Indx
) loop
6636 Typ
:= Base_Type
(Etype
(Indx
));
6638 if Is_Private_Type
(Typ
)
6639 and then Present
(Full_View
(Typ
))
6648 elsif Is_Private_Type
(T
)
6649 and then Present
(Full_View
(T
))
6650 and then Is_Array_Type
(Full_View
(T
))
6651 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
6655 -- Finally, a non-private subtype may have a private base type, which
6656 -- must be exchanged for consistency. This can happen when a package
6657 -- body is instantiated, when the scope stack is empty but in fact
6658 -- the subtype and the base type are declared in an enclosing scope.
6660 -- Note that in this case we introduce an inconsistency in the view
6661 -- set, because we switch the base type BT, but there could be some
6662 -- private dependent subtypes of BT which remain unswitched. Such
6663 -- subtypes might need to be switched at a later point (see specific
6664 -- provision for that case in Switch_View).
6666 elsif not Is_Private_Type
(T
)
6667 and then not Has_Private_View
(N
)
6668 and then Is_Private_Type
(BT
)
6669 and then Present
(Full_View
(BT
))
6670 and then not Is_Generic_Type
(BT
)
6671 and then not In_Open_Scopes
(BT
)
6673 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
6674 Exchange_Declarations
(BT
);
6677 end Check_Private_View
;
6679 -----------------------------
6680 -- Check_Hidden_Primitives --
6681 -----------------------------
6683 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
6686 Result
: Elist_Id
:= No_Elist
;
6689 if No
(Assoc_List
) then
6693 -- Traverse the list of associations between formals and actuals
6694 -- searching for renamings of tagged types
6696 Actual
:= First
(Assoc_List
);
6697 while Present
(Actual
) loop
6698 if Nkind
(Actual
) = N_Subtype_Declaration
then
6699 Gen_T
:= Generic_Parent_Type
(Actual
);
6702 and then Is_Tagged_Type
(Gen_T
)
6704 -- Traverse the list of primitives of the actual types
6705 -- searching for hidden primitives that are visible in the
6706 -- corresponding generic formal; leave them visible and
6707 -- append them to Result to restore their decoration later.
6709 Install_Hidden_Primitives
6710 (Prims_List
=> Result
,
6712 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
6720 end Check_Hidden_Primitives
;
6722 --------------------------
6723 -- Contains_Instance_Of --
6724 --------------------------
6726 function Contains_Instance_Of
6729 N
: Node_Id
) return Boolean
6737 -- Verify that there are no circular instantiations. We check whether
6738 -- the unit contains an instance of the current scope or some enclosing
6739 -- scope (in case one of the instances appears in a subunit). Longer
6740 -- circularities involving subunits might seem too pathological to
6741 -- consider, but they were not too pathological for the authors of
6742 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6743 -- enclosing generic scopes as containing an instance.
6746 -- Within a generic subprogram body, the scope is not generic, to
6747 -- allow for recursive subprograms. Use the declaration to determine
6748 -- whether this is a generic unit.
6750 if Ekind
(Scop
) = E_Generic_Package
6751 or else (Is_Subprogram
(Scop
)
6752 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
6753 N_Generic_Subprogram_Declaration
)
6755 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
6757 while Present
(Elmt
) loop
6758 if Node
(Elmt
) = Scop
then
6759 Error_Msg_Node_2
:= Inner
;
6761 ("circular Instantiation: & instantiated within &!",
6765 elsif Node
(Elmt
) = Inner
then
6768 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
6769 Error_Msg_Node_2
:= Inner
;
6771 ("circular Instantiation: & instantiated within &!",
6779 -- Indicate that Inner is being instantiated within Scop
6781 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
6784 if Scop
= Standard_Standard
then
6787 Scop
:= Scope
(Scop
);
6792 end Contains_Instance_Of
;
6794 -----------------------
6795 -- Copy_Generic_Node --
6796 -----------------------
6798 function Copy_Generic_Node
6800 Parent_Id
: Node_Id
;
6801 Instantiating
: Boolean) return Node_Id
6806 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
6807 -- Check the given value of one of the Fields referenced by the current
6808 -- node to determine whether to copy it recursively. The field may hold
6809 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
6810 -- Char) in which case it need not be copied.
6812 procedure Copy_Descendants
;
6813 -- Common utility for various nodes
6815 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
6816 -- Make copy of element list
6818 function Copy_Generic_List
6820 Parent_Id
: Node_Id
) return List_Id
;
6821 -- Apply Copy_Node recursively to the members of a node list
6823 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
6824 -- True if an identifier is part of the defining program unit name of
6825 -- a child unit. The entity of such an identifier must be kept (for
6826 -- ASIS use) even though as the name of an enclosing generic it would
6827 -- otherwise not be preserved in the generic tree.
6829 ----------------------
6830 -- Copy_Descendants --
6831 ----------------------
6833 procedure Copy_Descendants
is
6835 use Atree
.Unchecked_Access
;
6836 -- This code section is part of the implementation of an untyped
6837 -- tree traversal, so it needs direct access to node fields.
6840 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6841 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6842 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6843 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
6844 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6845 end Copy_Descendants
;
6847 -----------------------------
6848 -- Copy_Generic_Descendant --
6849 -----------------------------
6851 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
6853 if D
= Union_Id
(Empty
) then
6856 elsif D
in Node_Range
then
6858 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
6860 elsif D
in List_Range
then
6861 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
6863 elsif D
in Elist_Range
then
6864 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
6866 -- Nothing else is copyable (e.g. Uint values), return as is
6871 end Copy_Generic_Descendant
;
6873 ------------------------
6874 -- Copy_Generic_Elist --
6875 ------------------------
6877 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
6884 M
:= First_Elmt
(E
);
6885 while Present
(M
) loop
6887 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
6896 end Copy_Generic_Elist
;
6898 -----------------------
6899 -- Copy_Generic_List --
6900 -----------------------
6902 function Copy_Generic_List
6904 Parent_Id
: Node_Id
) return List_Id
6912 Set_Parent
(New_L
, Parent_Id
);
6915 while Present
(N
) loop
6916 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
6925 end Copy_Generic_List
;
6927 ---------------------------
6928 -- In_Defining_Unit_Name --
6929 ---------------------------
6931 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
6933 return Present
(Parent
(Nam
))
6934 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
6936 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
6937 and then In_Defining_Unit_Name
(Parent
(Nam
))));
6938 end In_Defining_Unit_Name
;
6940 -- Start of processing for Copy_Generic_Node
6947 New_N
:= New_Copy
(N
);
6949 -- Copy aspects if present
6951 if Has_Aspects
(N
) then
6952 Set_Has_Aspects
(New_N
, False);
6953 Set_Aspect_Specifications
6954 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
6957 if Instantiating
then
6958 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
6961 if not Is_List_Member
(N
) then
6962 Set_Parent
(New_N
, Parent_Id
);
6965 -- If defining identifier, then all fields have been copied already
6967 if Nkind
(New_N
) in N_Entity
then
6970 -- Special casing for identifiers and other entity names and operators
6972 elsif Nkind_In
(New_N
, N_Identifier
,
6973 N_Character_Literal
,
6976 or else Nkind
(New_N
) in N_Op
6978 if not Instantiating
then
6980 -- Link both nodes in order to assign subsequently the entity of
6981 -- the copy to the original node, in case this is a global
6984 Set_Associated_Node
(N
, New_N
);
6986 -- If we are within an instantiation, this is a nested generic
6987 -- that has already been analyzed at the point of definition.
6988 -- We must preserve references that were global to the enclosing
6989 -- parent at that point. Other occurrences, whether global or
6990 -- local to the current generic, must be resolved anew, so we
6991 -- reset the entity in the generic copy. A global reference has a
6992 -- smaller depth than the parent, or else the same depth in case
6993 -- both are distinct compilation units.
6995 -- A child unit is implicitly declared within the enclosing parent
6996 -- but is in fact global to it, and must be preserved.
6998 -- It is also possible for Current_Instantiated_Parent to be
6999 -- defined, and for this not to be a nested generic, namely if
7000 -- the unit is loaded through Rtsfind. In that case, the entity of
7001 -- New_N is only a link to the associated node, and not a defining
7004 -- The entities for parent units in the defining_program_unit of a
7005 -- generic child unit are established when the context of the unit
7006 -- is first analyzed, before the generic copy is made. They are
7007 -- preserved in the copy for use in ASIS queries.
7009 Ent
:= Entity
(New_N
);
7011 if No
(Current_Instantiated_Parent
.Gen_Id
) then
7013 or else Nkind
(Ent
) /= N_Defining_Identifier
7014 or else not In_Defining_Unit_Name
(N
)
7016 Set_Associated_Node
(New_N
, Empty
);
7021 not Nkind_In
(Ent
, N_Defining_Identifier
,
7022 N_Defining_Character_Literal
,
7023 N_Defining_Operator_Symbol
)
7024 or else No
(Scope
(Ent
))
7026 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
7027 and then not Is_Child_Unit
(Ent
))
7029 (Scope_Depth
(Scope
(Ent
)) >
7030 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
7032 Get_Source_Unit
(Ent
) =
7033 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
7035 Set_Associated_Node
(New_N
, Empty
);
7038 -- Case of instantiating identifier or some other name or operator
7041 -- If the associated node is still defined, the entity in it
7042 -- is global, and must be copied to the instance. If this copy
7043 -- is being made for a body to inline, it is applied to an
7044 -- instantiated tree, and the entity is already present and
7045 -- must be also preserved.
7048 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
7051 if Present
(Assoc
) then
7052 if Nkind
(Assoc
) = Nkind
(N
) then
7053 Set_Entity
(New_N
, Entity
(Assoc
));
7054 Check_Private_View
(N
);
7056 -- The name in the call may be a selected component if the
7057 -- call has not been analyzed yet, as may be the case for
7058 -- pre/post conditions in a generic unit.
7060 elsif Nkind
(Assoc
) = N_Function_Call
7061 and then Is_Entity_Name
(Name
(Assoc
))
7063 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
7065 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
7066 N_Defining_Character_Literal
,
7067 N_Defining_Operator_Symbol
)
7068 and then Expander_Active
7070 -- Inlining case: we are copying a tree that contains
7071 -- global entities, which are preserved in the copy to be
7072 -- used for subsequent inlining.
7077 Set_Entity
(New_N
, Empty
);
7083 -- For expanded name, we must copy the Prefix and Selector_Name
7085 if Nkind
(N
) = N_Expanded_Name
then
7087 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
7089 Set_Selector_Name
(New_N
,
7090 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
7092 -- For operators, we must copy the right operand
7094 elsif Nkind
(N
) in N_Op
then
7095 Set_Right_Opnd
(New_N
,
7096 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
7098 -- And for binary operators, the left operand as well
7100 if Nkind
(N
) in N_Binary_Op
then
7101 Set_Left_Opnd
(New_N
,
7102 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
7106 -- Special casing for stubs
7108 elsif Nkind
(N
) in N_Body_Stub
then
7110 -- In any case, we must copy the specification or defining
7111 -- identifier as appropriate.
7113 if Nkind
(N
) = N_Subprogram_Body_Stub
then
7114 Set_Specification
(New_N
,
7115 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
7118 Set_Defining_Identifier
(New_N
,
7120 (Defining_Identifier
(N
), New_N
, Instantiating
));
7123 -- If we are not instantiating, then this is where we load and
7124 -- analyze subunits, i.e. at the point where the stub occurs. A
7125 -- more permissive system might defer this analysis to the point
7126 -- of instantiation, but this seems too complicated for now.
7128 if not Instantiating
then
7130 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
7132 Unum
: Unit_Number_Type
;
7136 -- Make sure that, if it is a subunit of the main unit that is
7137 -- preprocessed and if -gnateG is specified, the preprocessed
7138 -- file will be written.
7140 Lib
.Analysing_Subunit_Of_Main
:=
7141 Lib
.In_Extended_Main_Source_Unit
(N
);
7144 (Load_Name
=> Subunit_Name
,
7148 Lib
.Analysing_Subunit_Of_Main
:= False;
7150 -- If the proper body is not found, a warning message will be
7151 -- emitted when analyzing the stub, or later at the point of
7152 -- instantiation. Here we just leave the stub as is.
7154 if Unum
= No_Unit
then
7155 Subunits_Missing
:= True;
7156 goto Subunit_Not_Found
;
7159 Subunit
:= Cunit
(Unum
);
7161 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
7163 ("found child unit instead of expected SEPARATE subunit",
7165 Error_Msg_Sloc
:= Sloc
(N
);
7166 Error_Msg_N
("\to complete stub #", Subunit
);
7167 goto Subunit_Not_Found
;
7170 -- We must create a generic copy of the subunit, in order to
7171 -- perform semantic analysis on it, and we must replace the
7172 -- stub in the original generic unit with the subunit, in order
7173 -- to preserve non-local references within.
7175 -- Only the proper body needs to be copied. Library_Unit and
7176 -- context clause are simply inherited by the generic copy.
7177 -- Note that the copy (which may be recursive if there are
7178 -- nested subunits) must be done first, before attaching it to
7179 -- the enclosing generic.
7183 (Proper_Body
(Unit
(Subunit
)),
7184 Empty
, Instantiating
=> False);
7186 -- Now place the original proper body in the original generic
7187 -- unit. This is a body, not a compilation unit.
7189 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
7190 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
7191 Set_Was_Originally_Stub
(N
);
7193 -- Finally replace the body of the subunit with its copy, and
7194 -- make this new subunit into the library unit of the generic
7195 -- copy, which does not have stubs any longer.
7197 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
7198 Set_Library_Unit
(New_N
, Subunit
);
7199 Inherit_Context
(Unit
(Subunit
), N
);
7202 -- If we are instantiating, this must be an error case, since
7203 -- otherwise we would have replaced the stub node by the proper body
7204 -- that corresponds. So just ignore it in the copy (i.e. we have
7205 -- copied it, and that is good enough).
7211 <<Subunit_Not_Found
>> null;
7213 -- If the node is a compilation unit, it is the subunit of a stub, which
7214 -- has been loaded already (see code below). In this case, the library
7215 -- unit field of N points to the parent unit (which is a compilation
7216 -- unit) and need not (and cannot) be copied.
7218 -- When the proper body of the stub is analyzed, the library_unit link
7219 -- is used to establish the proper context (see sem_ch10).
7221 -- The other fields of a compilation unit are copied as usual
7223 elsif Nkind
(N
) = N_Compilation_Unit
then
7225 -- This code can only be executed when not instantiating, because in
7226 -- the copy made for an instantiation, the compilation unit node has
7227 -- disappeared at the point that a stub is replaced by its proper
7230 pragma Assert
(not Instantiating
);
7232 Set_Context_Items
(New_N
,
7233 Copy_Generic_List
(Context_Items
(N
), New_N
));
7236 Copy_Generic_Node
(Unit
(N
), New_N
, False));
7238 Set_First_Inlined_Subprogram
(New_N
,
7240 (First_Inlined_Subprogram
(N
), New_N
, False));
7242 Set_Aux_Decls_Node
(New_N
,
7243 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
7245 -- For an assignment node, the assignment is known to be semantically
7246 -- legal if we are instantiating the template. This avoids incorrect
7247 -- diagnostics in generated code.
7249 elsif Nkind
(N
) = N_Assignment_Statement
then
7251 -- Copy name and expression fields in usual manner
7254 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
7256 Set_Expression
(New_N
,
7257 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
7259 if Instantiating
then
7260 Set_Assignment_OK
(Name
(New_N
), True);
7263 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
7264 if not Instantiating
then
7265 Set_Associated_Node
(N
, New_N
);
7268 if Present
(Get_Associated_Node
(N
))
7269 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
7271 -- In the generic the aggregate has some composite type. If at
7272 -- the point of instantiation the type has a private view,
7273 -- install the full view (and that of its ancestors, if any).
7276 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
7281 and then Is_Private_Type
(T
)
7287 and then Is_Tagged_Type
(T
)
7288 and then Is_Derived_Type
(T
)
7290 Rt
:= Root_Type
(T
);
7295 if Is_Private_Type
(T
) then
7306 -- Do not copy the associated node, which points to the generic copy
7307 -- of the aggregate.
7310 use Atree
.Unchecked_Access
;
7311 -- This code section is part of the implementation of an untyped
7312 -- tree traversal, so it needs direct access to node fields.
7315 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
7316 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
7317 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
7318 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
7321 -- Allocators do not have an identifier denoting the access type, so we
7322 -- must locate it through the expression to check whether the views are
7325 elsif Nkind
(N
) = N_Allocator
7326 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
7327 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
7328 and then Instantiating
7331 T
: constant Node_Id
:=
7332 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
7338 -- Retrieve the allocator node in the generic copy
7340 Acc_T
:= Etype
(Parent
(Parent
(T
)));
7342 and then Is_Private_Type
(Acc_T
)
7344 Switch_View
(Acc_T
);
7351 -- For a proper body, we must catch the case of a proper body that
7352 -- replaces a stub. This represents the point at which a separate
7353 -- compilation unit, and hence template file, may be referenced, so we
7354 -- must make a new source instantiation entry for the template of the
7355 -- subunit, and ensure that all nodes in the subunit are adjusted using
7356 -- this new source instantiation entry.
7358 elsif Nkind
(N
) in N_Proper_Body
then
7360 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
7363 if Instantiating
and then Was_Originally_Stub
(N
) then
7364 Create_Instantiation_Source
7365 (Instantiation_Node
,
7366 Defining_Entity
(N
),
7371 -- Now copy the fields of the proper body, using the new
7372 -- adjustment factor if one was needed as per test above.
7376 -- Restore the original adjustment factor in case changed
7378 S_Adjustment
:= Save_Adjustment
;
7381 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
7382 -- generic unit, not to the instantiating unit.
7384 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
7386 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
7388 if Prag_Id
= Pragma_Ident
or else Prag_Id
= Pragma_Comment
then
7389 New_N
:= Make_Null_Statement
(Sloc
(N
));
7395 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
7397 -- No descendant fields need traversing
7401 elsif Nkind
(N
) = N_String_Literal
7402 and then Present
(Etype
(N
))
7403 and then Instantiating
7405 -- If the string is declared in an outer scope, the string_literal
7406 -- subtype created for it may have the wrong scope. We force the
7407 -- reanalysis of the constant to generate a new itype in the proper
7410 Set_Etype
(New_N
, Empty
);
7411 Set_Analyzed
(New_N
, False);
7413 -- For the remaining nodes, copy their descendants recursively
7418 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
7419 Set_Generic_Parent
(Specification
(New_N
), N
);
7421 -- Should preserve Corresponding_Spec??? (12.3(14))
7426 end Copy_Generic_Node
;
7428 ----------------------------
7429 -- Denotes_Formal_Package --
7430 ----------------------------
7432 function Denotes_Formal_Package
7434 On_Exit
: Boolean := False;
7435 Instance
: Entity_Id
:= Empty
) return Boolean
7438 Scop
: constant Entity_Id
:= Scope
(Pack
);
7441 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
7442 -- The package in question may be an actual for a previous formal
7443 -- package P of the current instance, so examine its actuals as well.
7444 -- This must be recursive over other formal packages.
7446 ----------------------------------
7447 -- Is_Actual_Of_Previous_Formal --
7448 ----------------------------------
7450 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
7454 E1
:= First_Entity
(P
);
7455 while Present
(E1
) and then E1
/= Instance
loop
7456 if Ekind
(E1
) = E_Package
7457 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
7459 if Renamed_Object
(E1
) = Pack
then
7462 elsif E1
= P
or else Renamed_Object
(E1
) = P
then
7465 elsif Is_Actual_Of_Previous_Formal
(E1
) then
7474 end Is_Actual_Of_Previous_Formal
;
7476 -- Start of processing for Denotes_Formal_Package
7482 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
7484 Par
:= Current_Instantiated_Parent
.Act_Id
;
7487 if Ekind
(Scop
) = E_Generic_Package
7488 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
7489 N_Generic_Subprogram_Declaration
7493 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
7494 N_Formal_Package_Declaration
7502 -- Check whether this package is associated with a formal package of
7503 -- the enclosing instantiation. Iterate over the list of renamings.
7505 E
:= First_Entity
(Par
);
7506 while Present
(E
) loop
7507 if Ekind
(E
) /= E_Package
7508 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
7512 elsif Renamed_Object
(E
) = Par
then
7515 elsif Renamed_Object
(E
) = Pack
then
7518 elsif Is_Actual_Of_Previous_Formal
(E
) then
7528 end Denotes_Formal_Package
;
7534 procedure End_Generic
is
7536 -- ??? More things could be factored out in this routine. Should
7537 -- probably be done at a later stage.
7539 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
7540 Generic_Flags
.Decrement_Last
;
7542 Expander_Mode_Restore
;
7549 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
7550 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
7551 -- Find distance from given node to enclosing compilation unit
7557 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
7560 and then Nkind
(P
) /= N_Compilation_Unit
7562 P
:= True_Parent
(P
);
7567 -- Local declarations
7576 -- Start of processing for Earlier
7579 Find_Depth
(P1
, D1
);
7580 Find_Depth
(P2
, D2
);
7590 P1
:= True_Parent
(P1
);
7595 P2
:= True_Parent
(P2
);
7599 -- At this point P1 and P2 are at the same distance from the root.
7600 -- We examine their parents until we find a common declarative list.
7601 -- If we reach the root, N1 and N2 do not descend from the same
7602 -- declarative list (e.g. one is nested in the declarative part and
7603 -- the other is in a block in the statement part) and the earlier
7604 -- one is already frozen.
7606 while not Is_List_Member
(P1
)
7607 or else not Is_List_Member
(P2
)
7608 or else List_Containing
(P1
) /= List_Containing
(P2
)
7610 P1
:= True_Parent
(P1
);
7611 P2
:= True_Parent
(P2
);
7613 if Nkind
(Parent
(P1
)) = N_Subunit
then
7614 P1
:= Corresponding_Stub
(Parent
(P1
));
7617 if Nkind
(Parent
(P2
)) = N_Subunit
then
7618 P2
:= Corresponding_Stub
(Parent
(P2
));
7626 -- Expanded code usually shares the source location of the original
7627 -- construct it was generated for. This however may not necessarely
7628 -- reflect the true location of the code within the tree.
7630 -- Before comparing the slocs of the two nodes, make sure that we are
7631 -- working with correct source locations. Assume that P1 is to the left
7632 -- of P2. If either one does not come from source, traverse the common
7633 -- list heading towards the other node and locate the first source
7637 -- ----+===+===+--------------+===+===+----
7638 -- expanded code expanded code
7640 if not Comes_From_Source
(P1
) then
7641 while Present
(P1
) loop
7643 -- Neither P2 nor a source statement were located during the
7644 -- search. If we reach the end of the list, then P1 does not
7645 -- occur earlier than P2.
7648 -- start --- P2 ----- P1 --- end
7650 if No
(Next
(P1
)) then
7653 -- We encounter P2 while going to the right of the list. This
7654 -- means that P1 does indeed appear earlier.
7657 -- start --- P1 ===== P2 --- end
7658 -- expanded code in between
7663 -- No need to look any further since we have located a source
7666 elsif Comes_From_Source
(P1
) then
7676 if not Comes_From_Source
(P2
) then
7677 while Present
(P2
) loop
7679 -- Neither P1 nor a source statement were located during the
7680 -- search. If we reach the start of the list, then P1 does not
7681 -- occur earlier than P2.
7684 -- start --- P2 --- P1 --- end
7686 if No
(Prev
(P2
)) then
7689 -- We encounter P1 while going to the left of the list. This
7690 -- means that P1 does indeed appear earlier.
7693 -- start --- P1 ===== P2 --- end
7694 -- expanded code in between
7699 -- No need to look any further since we have located a source
7702 elsif Comes_From_Source
(P2
) then
7712 -- At this point either both nodes came from source or we approximated
7713 -- their source locations through neighbouring source statements.
7715 T1
:= Top_Level_Location
(Sloc
(P1
));
7716 T2
:= Top_Level_Location
(Sloc
(P2
));
7718 -- When two nodes come from the same instance, they have identical top
7719 -- level locations. To determine proper relation within the tree, check
7720 -- their locations within the template.
7723 return Sloc
(P1
) < Sloc
(P2
);
7725 -- The two nodes either come from unrelated instances or do not come
7726 -- from instantiated code at all.
7733 ----------------------
7734 -- Find_Actual_Type --
7735 ----------------------
7737 function Find_Actual_Type
7739 Gen_Type
: Entity_Id
) return Entity_Id
7741 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
7745 -- Special processing only applies to child units
7747 if not Is_Child_Unit
(Gen_Scope
) then
7748 return Get_Instance_Of
(Typ
);
7750 -- If designated or component type is itself a formal of the child unit,
7751 -- its instance is available.
7753 elsif Scope
(Typ
) = Gen_Scope
then
7754 return Get_Instance_Of
(Typ
);
7756 -- If the array or access type is not declared in the parent unit,
7757 -- no special processing needed.
7759 elsif not Is_Generic_Type
(Typ
)
7760 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
7762 return Get_Instance_Of
(Typ
);
7764 -- Otherwise, retrieve designated or component type by visibility
7767 T
:= Current_Entity
(Typ
);
7768 while Present
(T
) loop
7769 if In_Open_Scopes
(Scope
(T
)) then
7772 elsif Is_Generic_Actual_Type
(T
) then
7781 end Find_Actual_Type
;
7783 ----------------------------
7784 -- Freeze_Subprogram_Body --
7785 ----------------------------
7787 procedure Freeze_Subprogram_Body
7788 (Inst_Node
: Node_Id
;
7790 Pack_Id
: Entity_Id
)
7792 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7793 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
7799 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
7800 -- Find innermost package body that encloses the given node, and which
7801 -- is not a compilation unit. Freeze nodes for the instance, or for its
7802 -- enclosing body, may be inserted after the enclosing_body of the
7803 -- generic unit. Used to determine proper placement of freeze node for
7804 -- both package and subprogram instances.
7806 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
7807 -- Find entity for given package body, and locate or create a freeze
7810 ----------------------------
7811 -- Enclosing_Package_Body --
7812 ----------------------------
7814 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
7820 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
7822 if Nkind
(P
) = N_Package_Body
then
7823 if Nkind
(Parent
(P
)) = N_Subunit
then
7824 return Corresponding_Stub
(Parent
(P
));
7830 P
:= True_Parent
(P
);
7834 end Enclosing_Package_Body
;
7836 -------------------------
7837 -- Package_Freeze_Node --
7838 -------------------------
7840 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
7844 if Nkind
(B
) = N_Package_Body
then
7845 Id
:= Corresponding_Spec
(B
);
7846 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
7847 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
7850 Ensure_Freeze_Node
(Id
);
7851 return Freeze_Node
(Id
);
7852 end Package_Freeze_Node
;
7854 -- Start of processing of Freeze_Subprogram_Body
7857 -- If the instance and the generic body appear within the same unit, and
7858 -- the instance precedes the generic, the freeze node for the instance
7859 -- must appear after that of the generic. If the generic is nested
7860 -- within another instance I2, then current instance must be frozen
7861 -- after I2. In both cases, the freeze nodes are those of enclosing
7862 -- packages. Otherwise, the freeze node is placed at the end of the
7863 -- current declarative part.
7865 Enc_G
:= Enclosing_Package_Body
(Gen_Body
);
7866 Enc_I
:= Enclosing_Package_Body
(Inst_Node
);
7867 Ensure_Freeze_Node
(Pack_Id
);
7868 F_Node
:= Freeze_Node
(Pack_Id
);
7870 if Is_Generic_Instance
(Par
)
7871 and then Present
(Freeze_Node
(Par
))
7872 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
7874 -- The parent was a premature instantiation. Insert freeze node at
7875 -- the end the current declarative part.
7877 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
7878 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7880 -- Handle the following case:
7882 -- package Parent_Inst is new ...
7885 -- procedure P ... -- this body freezes Parent_Inst
7887 -- package Inst is new ...
7889 -- In this particular scenario, the freeze node for Inst must be
7890 -- inserted in the same manner as that of Parent_Inst - before the
7891 -- next source body or at the end of the declarative list (body not
7892 -- available). If body P did not exist and Parent_Inst was frozen
7893 -- after Inst, either by a body following Inst or at the end of the
7894 -- declarative region, the freeze node for Inst must be inserted
7895 -- after that of Parent_Inst. This relation is established by
7896 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7898 elsif List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
7899 List_Containing
(Inst_Node
)
7900 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Inst_Node
)
7902 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7905 Insert_After
(Freeze_Node
(Par
), F_Node
);
7908 -- The body enclosing the instance should be frozen after the body that
7909 -- includes the generic, because the body of the instance may make
7910 -- references to entities therein. If the two are not in the same
7911 -- declarative part, or if the one enclosing the instance is frozen
7912 -- already, freeze the instance at the end of the current declarative
7915 elsif Is_Generic_Instance
(Par
)
7916 and then Present
(Freeze_Node
(Par
))
7917 and then Present
(Enc_I
)
7919 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
7921 (Nkind
(Enc_I
) = N_Package_Body
7923 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
7925 -- The enclosing package may contain several instances. Rather
7926 -- than computing the earliest point at which to insert its freeze
7927 -- node, we place it at the end of the declarative part of the
7928 -- parent of the generic.
7930 Insert_Freeze_Node_For_Instance
7931 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
7934 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7936 elsif Present
(Enc_G
)
7937 and then Present
(Enc_I
)
7938 and then Enc_G
/= Enc_I
7939 and then Earlier
(Inst_Node
, Gen_Body
)
7941 if Nkind
(Enc_G
) = N_Package_Body
then
7942 E_G_Id
:= Corresponding_Spec
(Enc_G
);
7943 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
7945 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
7948 -- Freeze package that encloses instance, and place node after the
7949 -- package that encloses generic. If enclosing package is already
7950 -- frozen we have to assume it is at the proper place. This may be a
7951 -- potential ABE that requires dynamic checking. Do not add a freeze
7952 -- node if the package that encloses the generic is inside the body
7953 -- that encloses the instance, because the freeze node would be in
7954 -- the wrong scope. Additional contortions needed if the bodies are
7955 -- within a subunit.
7958 Enclosing_Body
: Node_Id
;
7961 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
7962 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
7964 Enclosing_Body
:= Enc_I
;
7967 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
7968 Insert_Freeze_Node_For_Instance
7969 (Enc_G
, Package_Freeze_Node
(Enc_I
));
7973 -- Freeze enclosing subunit before instance
7975 Ensure_Freeze_Node
(E_G_Id
);
7977 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
7978 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
7981 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7984 -- If none of the above, insert freeze node at the end of the current
7985 -- declarative part.
7987 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7989 end Freeze_Subprogram_Body
;
7995 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
7997 return Generic_Renamings
.Table
(E
).Gen_Id
;
8000 ---------------------
8001 -- Get_Instance_Of --
8002 ---------------------
8004 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
8005 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
8008 if Res
/= Assoc_Null
then
8009 return Generic_Renamings
.Table
(Res
).Act_Id
;
8011 -- On exit, entity is not instantiated: not a generic parameter, or
8012 -- else parameter of an inner generic unit.
8016 end Get_Instance_Of
;
8018 ------------------------------------
8019 -- Get_Package_Instantiation_Node --
8020 ------------------------------------
8022 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
8023 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
8027 -- If the Package_Instantiation attribute has been set on the package
8028 -- entity, then use it directly when it (or its Original_Node) refers
8029 -- to an N_Package_Instantiation node. In principle it should be
8030 -- possible to have this field set in all cases, which should be
8031 -- investigated, and would allow this function to be significantly
8034 Inst
:= Package_Instantiation
(A
);
8036 if Present
(Inst
) then
8037 if Nkind
(Inst
) = N_Package_Instantiation
then
8040 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
8041 return Original_Node
(Inst
);
8045 -- If the instantiation is a compilation unit that does not need body
8046 -- then the instantiation node has been rewritten as a package
8047 -- declaration for the instance, and we return the original node.
8049 -- If it is a compilation unit and the instance node has not been
8050 -- rewritten, then it is still the unit of the compilation. Finally, if
8051 -- a body is present, this is a parent of the main unit whose body has
8052 -- been compiled for inlining purposes, and the instantiation node has
8053 -- been rewritten with the instance body.
8055 -- Otherwise the instantiation node appears after the declaration. If
8056 -- the entity is a formal package, the declaration may have been
8057 -- rewritten as a generic declaration (in the case of a formal with box)
8058 -- or left as a formal package declaration if it has actuals, and is
8059 -- found with a forward search.
8061 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
8062 if Nkind
(Decl
) = N_Package_Declaration
8063 and then Present
(Corresponding_Body
(Decl
))
8065 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
8068 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
8069 return Original_Node
(Decl
);
8071 return Unit
(Parent
(Decl
));
8074 elsif Nkind
(Decl
) = N_Package_Declaration
8075 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
8077 return Original_Node
(Decl
);
8080 Inst
:= Next
(Decl
);
8081 while not Nkind_In
(Inst
, N_Package_Instantiation
,
8082 N_Formal_Package_Declaration
)
8089 end Get_Package_Instantiation_Node
;
8091 ------------------------
8092 -- Has_Been_Exchanged --
8093 ------------------------
8095 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
8099 Next
:= First_Elmt
(Exchanged_Views
);
8100 while Present
(Next
) loop
8101 if Full_View
(Node
(Next
)) = E
then
8109 end Has_Been_Exchanged
;
8115 function Hash
(F
: Entity_Id
) return HTable_Range
is
8117 return HTable_Range
(F
mod HTable_Size
);
8120 ------------------------
8121 -- Hide_Current_Scope --
8122 ------------------------
8124 procedure Hide_Current_Scope
is
8125 C
: constant Entity_Id
:= Current_Scope
;
8129 Set_Is_Hidden_Open_Scope
(C
);
8131 E
:= First_Entity
(C
);
8132 while Present
(E
) loop
8133 if Is_Immediately_Visible
(E
) then
8134 Set_Is_Immediately_Visible
(E
, False);
8135 Append_Elmt
(E
, Hidden_Entities
);
8141 -- Make the scope name invisible as well. This is necessary, but might
8142 -- conflict with calls to Rtsfind later on, in case the scope is a
8143 -- predefined one. There is no clean solution to this problem, so for
8144 -- now we depend on the user not redefining Standard itself in one of
8145 -- the parent units.
8147 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
8148 Set_Is_Immediately_Visible
(C
, False);
8149 Append_Elmt
(C
, Hidden_Entities
);
8152 end Hide_Current_Scope
;
8158 procedure Init_Env
is
8159 Saved
: Instance_Env
;
8162 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
8163 Saved
.Exchanged_Views
:= Exchanged_Views
;
8164 Saved
.Hidden_Entities
:= Hidden_Entities
;
8165 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
8166 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
8167 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
8169 -- Save configuration switches. These may be reset if the unit is a
8170 -- predefined unit, and the current mode is not Ada 2005.
8172 Save_Opt_Config_Switches
(Saved
.Switches
);
8174 Instance_Envs
.Append
(Saved
);
8176 Exchanged_Views
:= New_Elmt_List
;
8177 Hidden_Entities
:= New_Elmt_List
;
8179 -- Make dummy entry for Instantiated parent. If generic unit is legal,
8180 -- this is set properly in Set_Instance_Env.
8182 Current_Instantiated_Parent
:=
8183 (Current_Scope
, Current_Scope
, Assoc_Null
);
8186 ------------------------------
8187 -- In_Same_Declarative_Part --
8188 ------------------------------
8190 function In_Same_Declarative_Part
8192 Inst
: Node_Id
) return Boolean
8194 Decls
: constant Node_Id
:= Parent
(F_Node
);
8195 Nod
: Node_Id
:= Parent
(Inst
);
8198 while Present
(Nod
) loop
8202 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
8204 N_Package_Declaration
,
8211 elsif Nkind
(Nod
) = N_Subunit
then
8212 Nod
:= Corresponding_Stub
(Nod
);
8214 elsif Nkind
(Nod
) = N_Compilation_Unit
then
8218 Nod
:= Parent
(Nod
);
8223 end In_Same_Declarative_Part
;
8225 ---------------------
8226 -- In_Main_Context --
8227 ---------------------
8229 function In_Main_Context
(E
: Entity_Id
) return Boolean is
8235 if not Is_Compilation_Unit
(E
)
8236 or else Ekind
(E
) /= E_Package
8237 or else In_Private_Part
(E
)
8242 Context
:= Context_Items
(Cunit
(Main_Unit
));
8244 Clause
:= First
(Context
);
8245 while Present
(Clause
) loop
8246 if Nkind
(Clause
) = N_With_Clause
then
8247 Nam
:= Name
(Clause
);
8249 -- If the current scope is part of the context of the main unit,
8250 -- analysis of the corresponding with_clause is not complete, and
8251 -- the entity is not set. We use the Chars field directly, which
8252 -- might produce false positives in rare cases, but guarantees
8253 -- that we produce all the instance bodies we will need.
8255 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
8256 or else (Nkind
(Nam
) = N_Selected_Component
8257 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
8267 end In_Main_Context
;
8269 ---------------------
8270 -- Inherit_Context --
8271 ---------------------
8273 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
8274 Current_Context
: List_Id
;
8275 Current_Unit
: Node_Id
;
8284 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
8286 -- The inherited context is attached to the enclosing compilation
8287 -- unit. This is either the main unit, or the declaration for the
8288 -- main unit (in case the instantiation appears within the package
8289 -- declaration and the main unit is its body).
8291 Current_Unit
:= Parent
(Inst
);
8292 while Present
(Current_Unit
)
8293 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8295 Current_Unit
:= Parent
(Current_Unit
);
8298 Current_Context
:= Context_Items
(Current_Unit
);
8300 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
8301 while Present
(Item
) loop
8302 if Nkind
(Item
) = N_With_Clause
then
8303 Lib_Unit
:= Library_Unit
(Item
);
8305 -- Take care to prevent direct cyclic with's
8307 if Lib_Unit
/= Current_Unit
then
8309 -- Do not add a unit if it is already in the context
8311 Clause
:= First
(Current_Context
);
8313 while Present
(Clause
) loop
8314 if Nkind
(Clause
) = N_With_Clause
and then
8315 Library_Unit
(Clause
) = Lib_Unit
8325 New_I
:= New_Copy
(Item
);
8326 Set_Implicit_With
(New_I
, True);
8327 Set_Implicit_With_From_Instantiation
(New_I
, True);
8328 Append
(New_I
, Current_Context
);
8336 end Inherit_Context
;
8342 procedure Initialize
is
8344 Generic_Renamings
.Init
;
8347 Generic_Renamings_HTable
.Reset
;
8348 Circularity_Detected
:= False;
8349 Exchanged_Views
:= No_Elist
;
8350 Hidden_Entities
:= No_Elist
;
8353 -------------------------------------
8354 -- Insert_Freeze_Node_For_Instance --
8355 -------------------------------------
8357 procedure Insert_Freeze_Node_For_Instance
8366 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
8367 -- Find enclosing package or subprogram body, if any. Freeze node may
8368 -- be placed at end of current declarative list if previous instance
8369 -- and current one have different enclosing bodies.
8371 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
8372 -- Find the local instance, if any, that declares the generic that is
8373 -- being instantiated. If present, the freeze node for this instance
8374 -- must follow the freeze node for the previous instance.
8376 --------------------
8377 -- Enclosing_Body --
8378 --------------------
8380 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
8386 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
8388 if Nkind_In
(P
, N_Package_Body
, N_Subprogram_Body
) then
8389 if Nkind
(Parent
(P
)) = N_Subunit
then
8390 return Corresponding_Stub
(Parent
(P
));
8396 P
:= True_Parent
(P
);
8402 -----------------------
8403 -- Previous_Instance --
8404 -----------------------
8406 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
8412 and then S
/= Standard_Standard
8414 if Is_Generic_Instance
(S
)
8415 and then In_Same_Source_Unit
(S
, N
)
8424 end Previous_Instance
;
8426 -- Start of processing for Insert_Freeze_Node_For_Instance
8429 if not Is_List_Member
(F_Node
) then
8431 Decls
:= List_Containing
(N
);
8432 Inst
:= Entity
(F_Node
);
8433 Par_N
:= Parent
(Decls
);
8435 -- When processing a subprogram instantiation, utilize the actual
8436 -- subprogram instantiation rather than its package wrapper as it
8437 -- carries all the context information.
8439 if Is_Wrapper_Package
(Inst
) then
8440 Inst
:= Related_Instance
(Inst
);
8443 -- If this is a package instance, check whether the generic is
8444 -- declared in a previous instance and the current instance is
8445 -- not within the previous one.
8447 if Present
(Generic_Parent
(Parent
(Inst
)))
8448 and then Is_In_Main_Unit
(N
)
8451 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
8452 Par_I
: constant Entity_Id
:=
8454 (Generic_Parent
(Parent
(Inst
)));
8459 and then Earlier
(N
, Freeze_Node
(Par_I
))
8461 Scop
:= Scope
(Inst
);
8463 -- If the current instance is within the one that contains
8464 -- the generic, the freeze node for the current one must
8465 -- appear in the current declarative part. Ditto, if the
8466 -- current instance is within another package instance or
8467 -- within a body that does not enclose the current instance.
8468 -- In these three cases the freeze node of the previous
8469 -- instance is not relevant.
8471 while Present
(Scop
)
8472 and then Scop
/= Standard_Standard
8474 exit when Scop
= Par_I
8476 (Is_Generic_Instance
(Scop
)
8477 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
8478 Scop
:= Scope
(Scop
);
8481 -- Previous instance encloses current instance
8483 if Scop
= Par_I
then
8486 -- If the next node is a source body we must freeze in
8487 -- the current scope as well.
8489 elsif Present
(Next
(N
))
8490 and then Nkind_In
(Next
(N
),
8491 N_Subprogram_Body
, N_Package_Body
)
8492 and then Comes_From_Source
(Next
(N
))
8496 -- Current instance is within an unrelated instance
8498 elsif Is_Generic_Instance
(Scop
) then
8501 -- Current instance is within an unrelated body
8503 elsif Present
(Enclosing_N
)
8504 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
8509 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
8516 -- When the instantiation occurs in a package declaration, append the
8517 -- freeze node to the private declarations (if any).
8519 if Nkind
(Par_N
) = N_Package_Specification
8520 and then Decls
= Visible_Declarations
(Par_N
)
8521 and then Present
(Private_Declarations
(Par_N
))
8522 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
8524 Decls
:= Private_Declarations
(Par_N
);
8525 Decl
:= First
(Decls
);
8528 -- Determine the proper freeze point of a package instantiation. We
8529 -- adhere to the general rule of a package or subprogram body causing
8530 -- freezing of anything before it in the same declarative region. In
8531 -- this case, the proper freeze point of a package instantiation is
8532 -- before the first source body which follows, or before a stub. This
8533 -- ensures that entities coming from the instance are already frozen
8534 -- and usable in source bodies.
8536 if Nkind
(Par_N
) /= N_Package_Declaration
8537 and then Ekind
(Inst
) = E_Package
8538 and then Is_Generic_Instance
(Inst
)
8540 not In_Same_Source_Unit
(Generic_Parent
(Parent
(Inst
)), Inst
)
8542 while Present
(Decl
) loop
8543 if (Nkind
(Decl
) in N_Unit_Body
8545 Nkind
(Decl
) in N_Body_Stub
)
8546 and then Comes_From_Source
(Decl
)
8548 Insert_Before
(Decl
, F_Node
);
8556 -- In a package declaration, or if no previous body, insert at end
8559 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
8560 Insert_After
(Last
(Decls
), F_Node
);
8562 end Insert_Freeze_Node_For_Instance
;
8568 procedure Install_Body
8569 (Act_Body
: Node_Id
;
8574 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
8575 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
8576 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
8577 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
8578 Gen_Unit
: constant Node_Id
:=
8579 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
8580 Orig_Body
: Node_Id
:= Gen_Body
;
8582 Body_Unit
: Node_Id
;
8584 Must_Delay
: Boolean;
8586 function In_Same_Enclosing_Subp
return Boolean;
8587 -- Check whether instance and generic body are within same subprogram.
8589 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
8590 -- If the instance is nested inside a generic unit, the Sloc of the
8591 -- instance indicates the place of the original definition, not the
8592 -- point of the current enclosing instance. Pending a better usage of
8593 -- Slocs to indicate instantiation places, we determine the place of
8594 -- origin of a node by finding the maximum sloc of any ancestor node.
8595 -- Why is this not equivalent to Top_Level_Location ???
8597 ----------------------------
8598 -- In_Same_Enclosing_Subp --
8599 ----------------------------
8601 function In_Same_Enclosing_Subp
return Boolean is
8606 Scop
:= Scope
(Act_Id
);
8607 while Scop
/= Standard_Standard
8608 and then not Is_Overloadable
(Scop
)
8610 Scop
:= Scope
(Scop
);
8613 if Scop
= Standard_Standard
then
8619 Scop
:= Scope
(Gen_Id
);
8620 while Scop
/= Standard_Standard
loop
8624 Scop
:= Scope
(Scop
);
8629 end In_Same_Enclosing_Subp
;
8635 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
8642 while Present
(N1
) and then N1
/= Act_Unit
loop
8643 if Sloc
(N1
) > Res
then
8653 -- Start of processing for Install_Body
8656 -- If the body is a subunit, the freeze point is the corresponding stub
8657 -- in the current compilation, not the subunit itself.
8659 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
8660 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
8662 Orig_Body
:= Gen_Body
;
8665 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
8667 -- If the instantiation and the generic definition appear in the same
8668 -- package declaration, this is an early instantiation. If they appear
8669 -- in the same declarative part, it is an early instantiation only if
8670 -- the generic body appears textually later, and the generic body is
8671 -- also in the main unit.
8673 -- If instance is nested within a subprogram, and the generic body
8674 -- is not, the instance is delayed because the enclosing body is. If
8675 -- instance and body are within the same scope, or the same subprogram
8676 -- body, indicate explicitly that the instance is delayed.
8679 (Gen_Unit
= Act_Unit
8680 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
8681 N_Generic_Package_Declaration
)
8682 or else (Gen_Unit
= Body_Unit
8683 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
8684 and then Is_In_Main_Unit
(Gen_Unit
)
8685 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
8686 or else In_Same_Enclosing_Subp
));
8688 -- If this is an early instantiation, the freeze node is placed after
8689 -- the generic body. Otherwise, if the generic appears in an instance,
8690 -- we cannot freeze the current instance until the outer one is frozen.
8691 -- This is only relevant if the current instance is nested within some
8692 -- inner scope not itself within the outer instance. If this scope is
8693 -- a package body in the same declarative part as the outer instance,
8694 -- then that body needs to be frozen after the outer instance. Finally,
8695 -- if no delay is needed, we place the freeze node at the end of the
8696 -- current declarative part.
8698 if Expander_Active
then
8699 Ensure_Freeze_Node
(Act_Id
);
8700 F_Node
:= Freeze_Node
(Act_Id
);
8703 Insert_After
(Orig_Body
, F_Node
);
8705 elsif Is_Generic_Instance
(Par
)
8706 and then Present
(Freeze_Node
(Par
))
8707 and then Scope
(Act_Id
) /= Par
8709 -- Freeze instance of inner generic after instance of enclosing
8712 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
8714 -- Handle the following case:
8716 -- package Parent_Inst is new ...
8719 -- procedure P ... -- this body freezes Parent_Inst
8721 -- package Inst is new ...
8723 -- In this particular scenario, the freeze node for Inst must
8724 -- be inserted in the same manner as that of Parent_Inst,
8725 -- before the next source body or at the end of the declarative
8726 -- list (body not available). If body P did not exist and
8727 -- Parent_Inst was frozen after Inst, either by a body
8728 -- following Inst or at the end of the declarative region,
8729 -- the freeze node for Inst must be inserted after that of
8730 -- Parent_Inst. This relation is established by comparing
8731 -- the Slocs of Parent_Inst freeze node and Inst.
8733 if List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
8735 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(N
)
8737 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8739 Insert_After
(Freeze_Node
(Par
), F_Node
);
8742 -- Freeze package enclosing instance of inner generic after
8743 -- instance of enclosing generic.
8745 elsif Nkind_In
(Parent
(N
), N_Package_Body
, N_Subprogram_Body
)
8746 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
8749 Enclosing
: Entity_Id
;
8752 Enclosing
:= Corresponding_Spec
(Parent
(N
));
8754 if No
(Enclosing
) then
8755 Enclosing
:= Defining_Entity
(Parent
(N
));
8758 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8759 Ensure_Freeze_Node
(Enclosing
);
8761 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
8763 -- The enclosing context is a subunit, insert the freeze
8764 -- node after the stub.
8766 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
8767 Insert_Freeze_Node_For_Instance
8768 (Corresponding_Stub
(Parent
(Parent
(N
))),
8769 Freeze_Node
(Enclosing
));
8771 -- The enclosing context is a package with a stub body
8772 -- which has already been replaced by the real body.
8773 -- Insert the freeze node after the actual body.
8775 elsif Ekind
(Enclosing
) = E_Package
8776 and then Present
(Body_Entity
(Enclosing
))
8777 and then Was_Originally_Stub
8778 (Parent
(Body_Entity
(Enclosing
)))
8780 Insert_Freeze_Node_For_Instance
8781 (Parent
(Body_Entity
(Enclosing
)),
8782 Freeze_Node
(Enclosing
));
8784 -- The parent instance has been frozen before the body of
8785 -- the enclosing package, insert the freeze node after
8788 elsif List_Containing
(Freeze_Node
(Par
)) =
8789 List_Containing
(Parent
(N
))
8790 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Parent
(N
))
8792 Insert_Freeze_Node_For_Instance
8793 (Parent
(N
), Freeze_Node
(Enclosing
));
8797 (Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
8803 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8807 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8811 Set_Is_Frozen
(Act_Id
);
8812 Insert_Before
(N
, Act_Body
);
8813 Mark_Rewrite_Insertion
(Act_Body
);
8816 -----------------------------
8817 -- Install_Formal_Packages --
8818 -----------------------------
8820 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
8823 Gen_E
: Entity_Id
:= Empty
;
8826 E
:= First_Entity
(Par
);
8828 -- If we are installing an instance parent, locate the formal packages
8829 -- of its generic parent.
8831 if Is_Generic_Instance
(Par
) then
8832 Gen
:= Generic_Parent
(Package_Specification
(Par
));
8833 Gen_E
:= First_Entity
(Gen
);
8836 while Present
(E
) loop
8837 if Ekind
(E
) = E_Package
8838 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
8840 -- If this is the renaming for the parent instance, done
8842 if Renamed_Object
(E
) = Par
then
8845 -- The visibility of a formal of an enclosing generic is already
8848 elsif Denotes_Formal_Package
(E
) then
8851 elsif Present
(Associated_Formal_Package
(E
)) then
8852 Check_Generic_Actuals
(Renamed_Object
(E
), True);
8853 Set_Is_Hidden
(E
, False);
8855 -- Find formal package in generic unit that corresponds to
8856 -- (instance of) formal package in instance.
8858 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
8859 Next_Entity
(Gen_E
);
8862 if Present
(Gen_E
) then
8863 Map_Formal_Package_Entities
(Gen_E
, E
);
8869 if Present
(Gen_E
) then
8870 Next_Entity
(Gen_E
);
8873 end Install_Formal_Packages
;
8875 --------------------
8876 -- Install_Parent --
8877 --------------------
8879 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
8880 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
8881 S
: constant Entity_Id
:= Current_Scope
;
8882 Inst_Par
: Entity_Id
;
8883 First_Par
: Entity_Id
;
8884 Inst_Node
: Node_Id
;
8885 Gen_Par
: Entity_Id
;
8886 First_Gen
: Entity_Id
;
8889 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
8890 -- Install the scopes of noninstance parent units ending with Par
8892 procedure Install_Spec
(Par
: Entity_Id
);
8893 -- The child unit is within the declarative part of the parent, so the
8894 -- declarations within the parent are immediately visible.
8896 -------------------------------
8897 -- Install_Noninstance_Specs --
8898 -------------------------------
8900 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
8903 and then Par
/= Standard_Standard
8904 and then not In_Open_Scopes
(Par
)
8906 Install_Noninstance_Specs
(Scope
(Par
));
8909 end Install_Noninstance_Specs
;
8915 procedure Install_Spec
(Par
: Entity_Id
) is
8916 Spec
: constant Node_Id
:= Package_Specification
(Par
);
8919 -- If this parent of the child instance is a top-level unit,
8920 -- then record the unit and its visibility for later resetting in
8921 -- Remove_Parent. We exclude units that are generic instances, as we
8922 -- only want to record this information for the ultimate top-level
8923 -- noninstance parent (is that always correct???).
8925 if Scope
(Par
) = Standard_Standard
8926 and then not Is_Generic_Instance
(Par
)
8928 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
8929 Instance_Parent_Unit
:= Par
;
8932 -- Open the parent scope and make it and its declarations visible.
8933 -- If this point is not within a body, then only the visible
8934 -- declarations should be made visible, and installation of the
8935 -- private declarations is deferred until the appropriate point
8936 -- within analysis of the spec being instantiated (see the handling
8937 -- of parent visibility in Analyze_Package_Specification). This is
8938 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8939 -- private view problems that occur when compiling instantiations of
8940 -- a generic child of that package (Generic_Dispatching_Constructor).
8941 -- If the instance freezes a tagged type, inlinings of operations
8942 -- from Ada.Tags may need the full view of type Tag. If inlining took
8943 -- proper account of establishing visibility of inlined subprograms'
8944 -- parents then it should be possible to remove this
8945 -- special check. ???
8948 Set_Is_Immediately_Visible
(Par
);
8949 Install_Visible_Declarations
(Par
);
8950 Set_Use
(Visible_Declarations
(Spec
));
8952 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
8953 Install_Private_Declarations
(Par
);
8954 Set_Use
(Private_Declarations
(Spec
));
8958 -- Start of processing for Install_Parent
8961 -- We need to install the parent instance to compile the instantiation
8962 -- of the child, but the child instance must appear in the current
8963 -- scope. Given that we cannot place the parent above the current scope
8964 -- in the scope stack, we duplicate the current scope and unstack both
8965 -- after the instantiation is complete.
8967 -- If the parent is itself the instantiation of a child unit, we must
8968 -- also stack the instantiation of its parent, and so on. Each such
8969 -- ancestor is the prefix of the name in a prior instantiation.
8971 -- If this is a nested instance, the parent unit itself resolves to
8972 -- a renaming of the parent instance, whose declaration we need.
8974 -- Finally, the parent may be a generic (not an instance) when the
8975 -- child unit appears as a formal package.
8979 if Present
(Renamed_Entity
(Inst_Par
)) then
8980 Inst_Par
:= Renamed_Entity
(Inst_Par
);
8983 First_Par
:= Inst_Par
;
8985 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
8987 First_Gen
:= Gen_Par
;
8989 while Present
(Gen_Par
)
8990 and then Is_Child_Unit
(Gen_Par
)
8992 -- Load grandparent instance as well
8994 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
8996 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
8997 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
8999 if Present
(Renamed_Entity
(Inst_Par
)) then
9000 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9003 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9005 if Present
(Gen_Par
) then
9006 Prepend_Elmt
(Inst_Par
, Ancestors
);
9009 -- Parent is not the name of an instantiation
9011 Install_Noninstance_Specs
(Inst_Par
);
9022 if Present
(First_Gen
) then
9023 Append_Elmt
(First_Par
, Ancestors
);
9025 Install_Noninstance_Specs
(First_Par
);
9028 if not Is_Empty_Elmt_List
(Ancestors
) then
9029 Elmt
:= First_Elmt
(Ancestors
);
9030 while Present
(Elmt
) loop
9031 Install_Spec
(Node
(Elmt
));
9032 Install_Formal_Packages
(Node
(Elmt
));
9042 -------------------------------
9043 -- Install_Hidden_Primitives --
9044 -------------------------------
9046 procedure Install_Hidden_Primitives
9047 (Prims_List
: in out Elist_Id
;
9052 List
: Elist_Id
:= No_Elist
;
9053 Prim_G_Elmt
: Elmt_Id
;
9054 Prim_A_Elmt
: Elmt_Id
;
9059 -- No action needed in case of serious errors because we cannot trust
9060 -- in the order of primitives
9062 if Serious_Errors_Detected
> 0 then
9065 -- No action possible if we don't have available the list of primitive
9069 or else not Is_Record_Type
(Gen_T
)
9070 or else not Is_Tagged_Type
(Gen_T
)
9071 or else not Is_Record_Type
(Act_T
)
9072 or else not Is_Tagged_Type
(Act_T
)
9076 -- There is no need to handle interface types since their primitives
9079 elsif Is_Interface
(Gen_T
) then
9083 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
9085 if not Is_Class_Wide_Type
(Act_T
) then
9086 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
9088 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
9092 -- Skip predefined primitives in the generic formal
9094 while Present
(Prim_G_Elmt
)
9095 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
9097 Next_Elmt
(Prim_G_Elmt
);
9100 -- Skip predefined primitives in the generic actual
9102 while Present
(Prim_A_Elmt
)
9103 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
9105 Next_Elmt
(Prim_A_Elmt
);
9108 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
9110 Prim_G
:= Node
(Prim_G_Elmt
);
9111 Prim_A
:= Node
(Prim_A_Elmt
);
9113 -- There is no need to handle interface primitives because their
9114 -- primitives are not hidden
9116 exit when Present
(Interface_Alias
(Prim_G
));
9118 -- Here we install one hidden primitive
9120 if Chars
(Prim_G
) /= Chars
(Prim_A
)
9121 and then Has_Suffix
(Prim_A
, 'P')
9122 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
9124 Set_Chars
(Prim_A
, Chars
(Prim_G
));
9125 Append_New_Elmt
(Prim_A
, To
=> List
);
9128 Next_Elmt
(Prim_A_Elmt
);
9129 Next_Elmt
(Prim_G_Elmt
);
9132 -- Append the elements to the list of temporarily visible primitives
9133 -- avoiding duplicates.
9135 if Present
(List
) then
9136 if No
(Prims_List
) then
9137 Prims_List
:= New_Elmt_List
;
9140 Elmt
:= First_Elmt
(List
);
9141 while Present
(Elmt
) loop
9142 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
9146 end Install_Hidden_Primitives
;
9148 -------------------------------
9149 -- Restore_Hidden_Primitives --
9150 -------------------------------
9152 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
9153 Prim_Elmt
: Elmt_Id
;
9157 if Prims_List
/= No_Elist
then
9158 Prim_Elmt
:= First_Elmt
(Prims_List
);
9159 while Present
(Prim_Elmt
) loop
9160 Prim
:= Node
(Prim_Elmt
);
9161 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
9162 Next_Elmt
(Prim_Elmt
);
9165 Prims_List
:= No_Elist
;
9167 end Restore_Hidden_Primitives
;
9169 --------------------------------
9170 -- Instantiate_Formal_Package --
9171 --------------------------------
9173 function Instantiate_Formal_Package
9176 Analyzed_Formal
: Node_Id
) return List_Id
9178 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9179 Actual_Pack
: Entity_Id
;
9180 Formal_Pack
: Entity_Id
;
9181 Gen_Parent
: Entity_Id
;
9184 Parent_Spec
: Node_Id
;
9186 procedure Find_Matching_Actual
9188 Act
: in out Entity_Id
);
9189 -- We need to associate each formal entity in the formal package with
9190 -- the corresponding entity in the actual package. The actual package
9191 -- has been analyzed and possibly expanded, and as a result there is
9192 -- no one-to-one correspondence between the two lists (for example,
9193 -- the actual may include subtypes, itypes, and inherited primitive
9194 -- operations, interspersed among the renaming declarations for the
9195 -- actuals) . We retrieve the corresponding actual by name because each
9196 -- actual has the same name as the formal, and they do appear in the
9199 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
9200 -- Retrieve entity of defining entity of generic formal parameter.
9201 -- Only the declarations of formals need to be considered when
9202 -- linking them to actuals, but the declarative list may include
9203 -- internal entities generated during analysis, and those are ignored.
9205 procedure Match_Formal_Entity
9206 (Formal_Node
: Node_Id
;
9207 Formal_Ent
: Entity_Id
;
9208 Actual_Ent
: Entity_Id
);
9209 -- Associates the formal entity with the actual. In the case where
9210 -- Formal_Ent is a formal package, this procedure iterates through all
9211 -- of its formals and enters associations between the actuals occurring
9212 -- in the formal package's corresponding actual package (given by
9213 -- Actual_Ent) and the formal package's formal parameters. This
9214 -- procedure recurses if any of the parameters is itself a package.
9216 function Is_Instance_Of
9217 (Act_Spec
: Entity_Id
;
9218 Gen_Anc
: Entity_Id
) return Boolean;
9219 -- The actual can be an instantiation of a generic within another
9220 -- instance, in which case there is no direct link from it to the
9221 -- original generic ancestor. In that case, we recognize that the
9222 -- ultimate ancestor is the same by examining names and scopes.
9224 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
9225 -- If the current formal is declared with a box, its own formals are
9226 -- visible in the instance, as they were in the generic, and their
9227 -- Hidden flag must be reset. If some of these formals are themselves
9228 -- packages declared with a box, the processing must be recursive.
9230 --------------------------
9231 -- Find_Matching_Actual --
9232 --------------------------
9234 procedure Find_Matching_Actual
9236 Act
: in out Entity_Id
)
9238 Formal_Ent
: Entity_Id
;
9241 case Nkind
(Original_Node
(F
)) is
9242 when N_Formal_Object_Declaration |
9243 N_Formal_Type_Declaration
=>
9244 Formal_Ent
:= Defining_Identifier
(F
);
9246 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
9250 when N_Formal_Subprogram_Declaration |
9251 N_Formal_Package_Declaration |
9252 N_Package_Declaration |
9253 N_Generic_Package_Declaration
=>
9254 Formal_Ent
:= Defining_Entity
(F
);
9256 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
9261 raise Program_Error
;
9263 end Find_Matching_Actual
;
9265 -------------------------
9266 -- Match_Formal_Entity --
9267 -------------------------
9269 procedure Match_Formal_Entity
9270 (Formal_Node
: Node_Id
;
9271 Formal_Ent
: Entity_Id
;
9272 Actual_Ent
: Entity_Id
)
9274 Act_Pkg
: Entity_Id
;
9277 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
9279 if Ekind
(Actual_Ent
) = E_Package
then
9281 -- Record associations for each parameter
9283 Act_Pkg
:= Actual_Ent
;
9286 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
9295 -- Retrieve the actual given in the formal package declaration
9297 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
9299 -- The actual in the formal package declaration may be a
9300 -- renamed generic package, in which case we want to retrieve
9301 -- the original generic in order to traverse its formal part.
9303 if Present
(Renamed_Entity
(Actual
)) then
9304 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
9306 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
9309 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
9311 if Present
(Formals
) then
9312 F_Node
:= First_Non_Pragma
(Formals
);
9317 while Present
(A_Ent
)
9318 and then Present
(F_Node
)
9319 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
9321 F_Ent
:= Get_Formal_Entity
(F_Node
);
9323 if Present
(F_Ent
) then
9325 -- This is a formal of the original package. Record
9326 -- association and recurse.
9328 Find_Matching_Actual
(F_Node
, A_Ent
);
9329 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
9330 Next_Entity
(A_Ent
);
9333 Next_Non_Pragma
(F_Node
);
9337 end Match_Formal_Entity
;
9339 -----------------------
9340 -- Get_Formal_Entity --
9341 -----------------------
9343 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
9344 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
9347 when N_Formal_Object_Declaration
=>
9348 return Defining_Identifier
(N
);
9350 when N_Formal_Type_Declaration
=>
9351 return Defining_Identifier
(N
);
9353 when N_Formal_Subprogram_Declaration
=>
9354 return Defining_Unit_Name
(Specification
(N
));
9356 when N_Formal_Package_Declaration
=>
9357 return Defining_Identifier
(Original_Node
(N
));
9359 when N_Generic_Package_Declaration
=>
9360 return Defining_Identifier
(Original_Node
(N
));
9362 -- All other declarations are introduced by semantic analysis and
9363 -- have no match in the actual.
9368 end Get_Formal_Entity
;
9370 --------------------
9371 -- Is_Instance_Of --
9372 --------------------
9374 function Is_Instance_Of
9375 (Act_Spec
: Entity_Id
;
9376 Gen_Anc
: Entity_Id
) return Boolean
9378 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
9381 if No
(Gen_Par
) then
9384 -- Simplest case: the generic parent of the actual is the formal
9386 elsif Gen_Par
= Gen_Anc
then
9389 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
9392 -- The actual may be obtained through several instantiations. Its
9393 -- scope must itself be an instance of a generic declared in the
9394 -- same scope as the formal. Any other case is detected above.
9396 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
9400 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
9404 ---------------------------
9405 -- Process_Nested_Formal --
9406 ---------------------------
9408 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
9412 if Present
(Associated_Formal_Package
(Formal
))
9413 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
9415 Ent
:= First_Entity
(Formal
);
9416 while Present
(Ent
) loop
9417 Set_Is_Hidden
(Ent
, False);
9418 Set_Is_Visible_Formal
(Ent
);
9419 Set_Is_Potentially_Use_Visible
9420 (Ent
, Is_Potentially_Use_Visible
(Formal
));
9422 if Ekind
(Ent
) = E_Package
then
9423 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
9424 Process_Nested_Formal
(Ent
);
9430 end Process_Nested_Formal
;
9432 -- Start of processing for Instantiate_Formal_Package
9437 if not Is_Entity_Name
(Actual
)
9438 or else Ekind
(Entity
(Actual
)) /= E_Package
9441 ("expect package instance to instantiate formal", Actual
);
9442 Abandon_Instantiation
(Actual
);
9443 raise Program_Error
;
9446 Actual_Pack
:= Entity
(Actual
);
9447 Set_Is_Instantiated
(Actual_Pack
);
9449 -- The actual may be a renamed package, or an outer generic formal
9450 -- package whose instantiation is converted into a renaming.
9452 if Present
(Renamed_Object
(Actual_Pack
)) then
9453 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
9456 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
9457 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
9458 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
9461 Generic_Parent
(Specification
(Analyzed_Formal
));
9463 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9466 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
9467 Parent_Spec
:= Package_Specification
(Actual_Pack
);
9469 Parent_Spec
:= Parent
(Actual_Pack
);
9472 if Gen_Parent
= Any_Id
then
9474 ("previous error in declaration of formal package", Actual
);
9475 Abandon_Instantiation
(Actual
);
9478 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
9484 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
9485 Abandon_Instantiation
(Actual
);
9488 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
9489 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
9492 Make_Package_Renaming_Declaration
(Loc
,
9493 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
9494 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
9496 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
9497 Defining_Identifier
(Formal
));
9498 Decls
:= New_List
(Nod
);
9500 -- If the formal F has a box, then the generic declarations are
9501 -- visible in the generic G. In an instance of G, the corresponding
9502 -- entities in the actual for F (which are the actuals for the
9503 -- instantiation of the generic that F denotes) must also be made
9504 -- visible for analysis of the current instance. On exit from the
9505 -- current instance, those entities are made private again. If the
9506 -- actual is currently in use, these entities are also use-visible.
9508 -- The loop through the actual entities also steps through the formal
9509 -- entities and enters associations from formals to actuals into the
9510 -- renaming map. This is necessary to properly handle checking of
9511 -- actual parameter associations for later formals that depend on
9512 -- actuals declared in the formal package.
9514 -- In Ada 2005, partial parameterization requires that we make
9515 -- visible the actuals corresponding to formals that were defaulted
9516 -- in the formal package. There formals are identified because they
9517 -- remain formal generics within the formal package, rather than
9518 -- being renamings of the actuals supplied.
9521 Gen_Decl
: constant Node_Id
:=
9522 Unit_Declaration_Node
(Gen_Parent
);
9523 Formals
: constant List_Id
:=
9524 Generic_Formal_Declarations
(Gen_Decl
);
9526 Actual_Ent
: Entity_Id
;
9527 Actual_Of_Formal
: Node_Id
;
9528 Formal_Node
: Node_Id
;
9529 Formal_Ent
: Entity_Id
;
9532 if Present
(Formals
) then
9533 Formal_Node
:= First_Non_Pragma
(Formals
);
9535 Formal_Node
:= Empty
;
9538 Actual_Ent
:= First_Entity
(Actual_Pack
);
9540 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
9541 while Present
(Actual_Ent
)
9542 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9544 if Present
(Formal_Node
) then
9545 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
9547 if Present
(Formal_Ent
) then
9548 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
9550 (Formal_Node
, Formal_Ent
, Actual_Ent
);
9552 -- We iterate at the same time over the actuals of the
9553 -- local package created for the formal, to determine
9554 -- which one of the formals of the original generic were
9555 -- defaulted in the formal. The corresponding actual
9556 -- entities are visible in the enclosing instance.
9558 if Box_Present
(Formal
)
9560 (Present
(Actual_Of_Formal
)
9563 (Get_Formal_Entity
(Actual_Of_Formal
)))
9565 Set_Is_Hidden
(Actual_Ent
, False);
9566 Set_Is_Visible_Formal
(Actual_Ent
);
9567 Set_Is_Potentially_Use_Visible
9568 (Actual_Ent
, In_Use
(Actual_Pack
));
9570 if Ekind
(Actual_Ent
) = E_Package
then
9571 Process_Nested_Formal
(Actual_Ent
);
9575 Set_Is_Hidden
(Actual_Ent
);
9576 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
9580 Next_Non_Pragma
(Formal_Node
);
9581 Next
(Actual_Of_Formal
);
9584 -- No further formals to match, but the generic part may
9585 -- contain inherited operation that are not hidden in the
9586 -- enclosing instance.
9588 Next_Entity
(Actual_Ent
);
9592 -- Inherited subprograms generated by formal derived types are
9593 -- also visible if the types are.
9595 Actual_Ent
:= First_Entity
(Actual_Pack
);
9596 while Present
(Actual_Ent
)
9597 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9599 if Is_Overloadable
(Actual_Ent
)
9601 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
9603 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
9605 Set_Is_Hidden
(Actual_Ent
, False);
9606 Set_Is_Potentially_Use_Visible
9607 (Actual_Ent
, In_Use
(Actual_Pack
));
9610 Next_Entity
(Actual_Ent
);
9614 -- If the formal is not declared with a box, reanalyze it as an
9615 -- abbreviated instantiation, to verify the matching rules of 12.7.
9616 -- The actual checks are performed after the generic associations
9617 -- have been analyzed, to guarantee the same visibility for this
9618 -- instantiation and for the actuals.
9620 -- In Ada 2005, the generic associations for the formal can include
9621 -- defaulted parameters. These are ignored during check. This
9622 -- internal instantiation is removed from the tree after conformance
9623 -- checking, because it contains formal declarations for those
9624 -- defaulted parameters, and those should not reach the back-end.
9626 if not Box_Present
(Formal
) then
9628 I_Pack
: constant Entity_Id
:=
9629 Make_Temporary
(Sloc
(Actual
), 'P');
9632 Set_Is_Internal
(I_Pack
);
9635 Make_Package_Instantiation
(Sloc
(Actual
),
9636 Defining_Unit_Name
=> I_Pack
,
9639 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
9640 Generic_Associations
=>
9641 Generic_Associations
(Formal
)));
9647 end Instantiate_Formal_Package
;
9649 -----------------------------------
9650 -- Instantiate_Formal_Subprogram --
9651 -----------------------------------
9653 function Instantiate_Formal_Subprogram
9656 Analyzed_Formal
: Node_Id
) return Node_Id
9658 Analyzed_S
: constant Entity_Id
:=
9659 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9660 Formal_Sub
: constant Entity_Id
:=
9661 Defining_Unit_Name
(Specification
(Formal
));
9663 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
9664 -- If the generic is a child unit, the parent has been installed on the
9665 -- scope stack, but a default subprogram cannot resolve to something
9666 -- on the parent because that parent is not really part of the visible
9667 -- context (it is there to resolve explicit local entities). If the
9668 -- default has resolved in this way, we remove the entity from immediate
9669 -- visibility and analyze the node again to emit an error message or
9670 -- find another visible candidate.
9672 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
9673 -- Perform legality check and raise exception on failure
9675 -----------------------
9676 -- From_Parent_Scope --
9677 -----------------------
9679 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
9680 Gen_Scope
: Node_Id
;
9683 Gen_Scope
:= Scope
(Analyzed_S
);
9684 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
9685 if Scope
(Subp
) = Scope
(Gen_Scope
) then
9689 Gen_Scope
:= Scope
(Gen_Scope
);
9693 end From_Parent_Scope
;
9695 -----------------------------
9696 -- Valid_Actual_Subprogram --
9697 -----------------------------
9699 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
9703 if Is_Entity_Name
(Act
) then
9704 Act_E
:= Entity
(Act
);
9706 elsif Nkind
(Act
) = N_Selected_Component
9707 and then Is_Entity_Name
(Selector_Name
(Act
))
9709 Act_E
:= Entity
(Selector_Name
(Act
));
9715 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
9716 or else Nkind_In
(Act
, N_Attribute_Reference
,
9717 N_Indexed_Component
,
9718 N_Character_Literal
,
9719 N_Explicit_Dereference
)
9725 ("expect subprogram or entry name in instantiation of&",
9726 Instantiation_Node
, Formal_Sub
);
9727 Abandon_Instantiation
(Instantiation_Node
);
9728 end Valid_Actual_Subprogram
;
9732 Decl_Node
: Node_Id
;
9737 -- Start of processing for Instantiate_Formal_Subprogram
9740 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
9742 -- The tree copy has created the proper instantiation sloc for the
9743 -- new specification. Use this location for all other constructed
9746 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
9748 -- Create new entity for the actual (New_Copy_Tree does not), and
9749 -- indicate that it is an actual.
9751 Set_Defining_Unit_Name
9752 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9753 Set_Ekind
(Defining_Unit_Name
(New_Spec
), Ekind
(Analyzed_S
));
9754 Set_Is_Generic_Actual_Subprogram
(Defining_Unit_Name
(New_Spec
));
9756 -- Create new entities for the each of the formals in the specification
9757 -- of the renaming declaration built for the actual.
9759 if Present
(Parameter_Specifications
(New_Spec
)) then
9765 F
:= First
(Parameter_Specifications
(New_Spec
));
9766 while Present
(F
) loop
9767 F_Id
:= Defining_Identifier
(F
);
9769 Set_Defining_Identifier
(F
,
9770 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
9776 -- Find entity of actual. If the actual is an attribute reference, it
9777 -- cannot be resolved here (its formal is missing) but is handled
9778 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9779 -- fully resolved subsequently, when the renaming declaration for the
9780 -- formal is analyzed. If it is an explicit dereference, resolve the
9781 -- prefix but not the actual itself, to prevent interpretation as call.
9783 if Present
(Actual
) then
9784 Loc
:= Sloc
(Actual
);
9785 Set_Sloc
(New_Spec
, Loc
);
9787 if Nkind
(Actual
) = N_Operator_Symbol
then
9788 Find_Direct_Name
(Actual
);
9790 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
9791 Analyze
(Prefix
(Actual
));
9793 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
9797 Valid_Actual_Subprogram
(Actual
);
9800 elsif Present
(Default_Name
(Formal
)) then
9801 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
9802 N_Selected_Component
,
9803 N_Indexed_Component
,
9804 N_Character_Literal
)
9805 and then Present
(Entity
(Default_Name
(Formal
)))
9807 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
9809 Nam
:= New_Copy
(Default_Name
(Formal
));
9810 Set_Sloc
(Nam
, Loc
);
9813 elsif Box_Present
(Formal
) then
9815 -- Actual is resolved at the point of instantiation. Create an
9816 -- identifier or operator with the same name as the formal.
9818 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
9820 Make_Operator_Symbol
(Loc
,
9821 Chars
=> Chars
(Formal_Sub
),
9822 Strval
=> No_String
);
9824 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
9827 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
9828 and then Null_Present
(Specification
(Formal
))
9830 -- Generate null body for procedure, for use in the instance
9833 Make_Subprogram_Body
(Loc
,
9834 Specification
=> New_Spec
,
9835 Declarations
=> New_List
,
9836 Handled_Statement_Sequence
=>
9837 Make_Handled_Sequence_Of_Statements
(Loc
,
9838 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
9840 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
9844 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
9846 ("missing actual&", Instantiation_Node
, Formal_Sub
);
9848 ("\in instantiation of & declared#",
9849 Instantiation_Node
, Scope
(Analyzed_S
));
9850 Abandon_Instantiation
(Instantiation_Node
);
9854 Make_Subprogram_Renaming_Declaration
(Loc
,
9855 Specification
=> New_Spec
,
9858 -- If we do not have an actual and the formal specified <> then set to
9859 -- get proper default.
9861 if No
(Actual
) and then Box_Present
(Formal
) then
9862 Set_From_Default
(Decl_Node
);
9865 -- Gather possible interpretations for the actual before analyzing the
9866 -- instance. If overloaded, it will be resolved when analyzing the
9867 -- renaming declaration.
9869 if Box_Present
(Formal
) and then No
(Actual
) then
9872 if Is_Child_Unit
(Scope
(Analyzed_S
))
9873 and then Present
(Entity
(Nam
))
9875 if not Is_Overloaded
(Nam
) then
9876 if From_Parent_Scope
(Entity
(Nam
)) then
9877 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
9878 Set_Entity
(Nam
, Empty
);
9879 Set_Etype
(Nam
, Empty
);
9882 Set_Is_Immediately_Visible
(Entity
(Nam
));
9891 Get_First_Interp
(Nam
, I
, It
);
9892 while Present
(It
.Nam
) loop
9893 if From_Parent_Scope
(It
.Nam
) then
9897 Get_Next_Interp
(I
, It
);
9904 -- The generic instantiation freezes the actual. This can only be done
9905 -- once the actual is resolved, in the analysis of the renaming
9906 -- declaration. To make the formal subprogram entity available, we set
9907 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9908 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9909 -- of formal abstract subprograms.
9911 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
9913 -- We cannot analyze the renaming declaration, and thus find the actual,
9914 -- until all the actuals are assembled in the instance. For subsequent
9915 -- checks of other actuals, indicate the node that will hold the
9916 -- instance of this formal.
9918 Set_Instance_Of
(Analyzed_S
, Nam
);
9920 if Nkind
(Actual
) = N_Selected_Component
9921 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
9922 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
9924 -- The renaming declaration will create a body, which must appear
9925 -- outside of the instantiation, We move the renaming declaration
9926 -- out of the instance, and create an additional renaming inside,
9927 -- to prevent freezing anomalies.
9930 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
9933 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
9934 Insert_Before
(Instantiation_Node
, Decl_Node
);
9935 Analyze
(Decl_Node
);
9937 -- Now create renaming within the instance
9940 Make_Subprogram_Renaming_Declaration
(Loc
,
9941 Specification
=> New_Copy_Tree
(New_Spec
),
9942 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
9944 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
9945 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9950 end Instantiate_Formal_Subprogram
;
9952 ------------------------
9953 -- Instantiate_Object --
9954 ------------------------
9956 function Instantiate_Object
9959 Analyzed_Formal
: Node_Id
) return List_Id
9961 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
9962 A_Gen_Obj
: constant Entity_Id
:=
9963 Defining_Identifier
(Analyzed_Formal
);
9964 Acc_Def
: Node_Id
:= Empty
;
9965 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
9966 Actual_Decl
: Node_Id
:= Empty
;
9967 Decl_Node
: Node_Id
;
9970 List
: constant List_Id
:= New_List
;
9971 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9972 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
9973 Subt_Decl
: Node_Id
:= Empty
;
9974 Subt_Mark
: Node_Id
:= Empty
;
9977 if Present
(Subtype_Mark
(Formal
)) then
9978 Subt_Mark
:= Subtype_Mark
(Formal
);
9980 Check_Access_Definition
(Formal
);
9981 Acc_Def
:= Access_Definition
(Formal
);
9984 -- Sloc for error message on missing actual
9986 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
9988 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
9989 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
9992 Set_Parent
(List
, Parent
(Actual
));
9996 if Out_Present
(Formal
) then
9998 -- An IN OUT generic actual must be a name. The instantiation is a
9999 -- renaming declaration. The actual is the name being renamed. We
10000 -- use the actual directly, rather than a copy, because it is not
10001 -- used further in the list of actuals, and because a copy or a use
10002 -- of relocate_node is incorrect if the instance is nested within a
10003 -- generic. In order to simplify ASIS searches, the Generic_Parent
10004 -- field links the declaration to the generic association.
10006 if No
(Actual
) then
10008 ("missing actual&",
10009 Instantiation_Node
, Gen_Obj
);
10011 ("\in instantiation of & declared#",
10012 Instantiation_Node
, Scope
(A_Gen_Obj
));
10013 Abandon_Instantiation
(Instantiation_Node
);
10016 if Present
(Subt_Mark
) then
10018 Make_Object_Renaming_Declaration
(Loc
,
10019 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10020 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
10023 else pragma Assert
(Present
(Acc_Def
));
10025 Make_Object_Renaming_Declaration
(Loc
,
10026 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10027 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
10031 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10033 -- The analysis of the actual may produce Insert_Action nodes, so
10034 -- the declaration must have a context in which to attach them.
10036 Append
(Decl_Node
, List
);
10039 -- Return if the analysis of the actual reported some error
10041 if Etype
(Actual
) = Any_Type
then
10045 -- This check is performed here because Analyze_Object_Renaming will
10046 -- not check it when Comes_From_Source is False. Note though that the
10047 -- check for the actual being the name of an object will be performed
10048 -- in Analyze_Object_Renaming.
10050 if Is_Object_Reference
(Actual
)
10051 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
10054 ("illegal discriminant-dependent component for in out parameter",
10058 -- The actual has to be resolved in order to check that it is a
10059 -- variable (due to cases such as F (1), where F returns access to
10060 -- an array, and for overloaded prefixes).
10062 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
10064 -- If the type of the formal is not itself a formal, and the current
10065 -- unit is a child unit, the formal type must be declared in a
10066 -- parent, and must be retrieved by visibility.
10068 if Ftyp
= Orig_Ftyp
10069 and then Is_Generic_Unit
(Scope
(Ftyp
))
10070 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
10073 Temp
: constant Node_Id
:=
10074 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
10076 Set_Entity
(Temp
, Empty
);
10078 Ftyp
:= Entity
(Temp
);
10082 if Is_Private_Type
(Ftyp
)
10083 and then not Is_Private_Type
(Etype
(Actual
))
10084 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
10085 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
10087 -- If the actual has the type of the full view of the formal, or
10088 -- else a non-private subtype of the formal, then the visibility
10089 -- of the formal type has changed. Add to the actuals a subtype
10090 -- declaration that will force the exchange of views in the body
10091 -- of the instance as well.
10094 Make_Subtype_Declaration
(Loc
,
10095 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
10096 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
10098 Prepend
(Subt_Decl
, List
);
10100 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
10101 Exchange_Declarations
(Ftyp
);
10104 Resolve
(Actual
, Ftyp
);
10106 if not Denotes_Variable
(Actual
) then
10108 ("actual for& must be a variable", Actual
, Gen_Obj
);
10110 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
10112 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
10113 -- the type of the actual shall resolve to a specific anonymous
10116 if Ada_Version
< Ada_2005
10117 or else Ekind
(Base_Type
(Ftyp
)) /=
10118 E_Anonymous_Access_Type
10119 or else Ekind
(Base_Type
(Etype
(Actual
))) /=
10120 E_Anonymous_Access_Type
10123 ("type of actual does not match type of&", Actual
, Gen_Obj
);
10127 Note_Possible_Modification
(Actual
, Sure
=> True);
10129 -- Check for instantiation of atomic/volatile actual for
10130 -- non-atomic/volatile formal (RM C.6 (12)).
10132 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
10134 ("cannot instantiate non-atomic formal object "
10135 & "with atomic actual", Actual
);
10137 elsif Is_Volatile_Object
(Actual
) and then not Is_Volatile
(Orig_Ftyp
)
10140 ("cannot instantiate non-volatile formal object "
10141 & "with volatile actual", Actual
);
10144 -- Formal in-parameter
10147 -- The instantiation of a generic formal in-parameter is constant
10148 -- declaration. The actual is the expression for that declaration.
10150 if Present
(Actual
) then
10151 if Present
(Subt_Mark
) then
10153 else pragma Assert
(Present
(Acc_Def
));
10158 Make_Object_Declaration
(Loc
,
10159 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10160 Constant_Present
=> True,
10161 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10162 Object_Definition
=> New_Copy_Tree
(Def
),
10163 Expression
=> Actual
);
10165 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10167 -- A generic formal object of a tagged type is defined to be
10168 -- aliased so the new constant must also be treated as aliased.
10170 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
10171 Set_Aliased_Present
(Decl_Node
);
10174 Append
(Decl_Node
, List
);
10176 -- No need to repeat (pre-)analysis of some expression nodes
10177 -- already handled in Preanalyze_Actuals.
10179 if Nkind
(Actual
) /= N_Allocator
then
10182 -- Return if the analysis of the actual reported some error
10184 if Etype
(Actual
) = Any_Type
then
10190 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
10194 Typ
:= Get_Instance_Of
(Formal_Type
);
10196 Freeze_Before
(Instantiation_Node
, Typ
);
10198 -- If the actual is an aggregate, perform name resolution on
10199 -- its components (the analysis of an aggregate does not do it)
10200 -- to capture local names that may be hidden if the generic is
10203 if Nkind
(Actual
) = N_Aggregate
then
10204 Preanalyze_And_Resolve
(Actual
, Typ
);
10207 if Is_Limited_Type
(Typ
)
10208 and then not OK_For_Limited_Init
(Typ
, Actual
)
10211 ("initialization not allowed for limited types", Actual
);
10212 Explain_Limited_Type
(Typ
, Actual
);
10216 elsif Present
(Default_Expression
(Formal
)) then
10218 -- Use default to construct declaration
10220 if Present
(Subt_Mark
) then
10222 else pragma Assert
(Present
(Acc_Def
));
10227 Make_Object_Declaration
(Sloc
(Formal
),
10228 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10229 Constant_Present
=> True,
10230 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10231 Object_Definition
=> New_Copy
(Def
),
10232 Expression
=> New_Copy_Tree
10233 (Default_Expression
(Formal
)));
10235 Append
(Decl_Node
, List
);
10236 Set_Analyzed
(Expression
(Decl_Node
), False);
10240 ("missing actual&",
10241 Instantiation_Node
, Gen_Obj
);
10242 Error_Msg_NE
("\in instantiation of & declared#",
10243 Instantiation_Node
, Scope
(A_Gen_Obj
));
10245 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
10247 -- Create dummy constant declaration so that instance can be
10248 -- analyzed, to minimize cascaded visibility errors.
10250 if Present
(Subt_Mark
) then
10252 else pragma Assert
(Present
(Acc_Def
));
10257 Make_Object_Declaration
(Loc
,
10258 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10259 Constant_Present
=> True,
10260 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10261 Object_Definition
=> New_Copy
(Def
),
10263 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
10264 Attribute_Name
=> Name_First
,
10265 Prefix
=> New_Copy
(Def
)));
10267 Append
(Decl_Node
, List
);
10270 Abandon_Instantiation
(Instantiation_Node
);
10275 if Nkind
(Actual
) in N_Has_Entity
then
10276 Actual_Decl
:= Parent
(Entity
(Actual
));
10279 -- Ada 2005 (AI-423): For a formal object declaration with a null
10280 -- exclusion or an access definition that has a null exclusion: If the
10281 -- actual matching the formal object declaration denotes a generic
10282 -- formal object of another generic unit G, and the instantiation
10283 -- containing the actual occurs within the body of G or within the body
10284 -- of a generic unit declared within the declarative region of G, then
10285 -- the declaration of the formal object of G must have a null exclusion.
10286 -- Otherwise, the subtype of the actual matching the formal object
10287 -- declaration shall exclude null.
10289 if Ada_Version
>= Ada_2005
10290 and then Present
(Actual_Decl
)
10292 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
10293 N_Object_Declaration
)
10294 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
10295 and then not Has_Null_Exclusion
(Actual_Decl
)
10296 and then Has_Null_Exclusion
(Analyzed_Formal
)
10298 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
10300 ("actual must exclude null to match generic formal#", Actual
);
10303 -- An effectively volatile object cannot be used as an actual in
10304 -- a generic instance. The following check is only relevant when
10305 -- SPARK_Mode is on as it is not a standard Ada legality rule.
10308 and then Present
(Actual
)
10309 and then Is_Effectively_Volatile_Object
(Actual
)
10312 ("volatile object cannot act as actual in generic instantiation "
10313 & "(SPARK RM 7.1.3(8))", Actual
);
10317 end Instantiate_Object
;
10319 ------------------------------
10320 -- Instantiate_Package_Body --
10321 ------------------------------
10323 procedure Instantiate_Package_Body
10324 (Body_Info
: Pending_Body_Info
;
10325 Inlined_Body
: Boolean := False;
10326 Body_Optional
: Boolean := False)
10328 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
10329 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
10330 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
10332 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
10333 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
10334 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
10335 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
10336 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
10338 Act_Body_Name
: Node_Id
;
10339 Gen_Body
: Node_Id
;
10340 Gen_Body_Id
: Node_Id
;
10341 Act_Body
: Node_Id
;
10342 Act_Body_Id
: Entity_Id
;
10344 Parent_Installed
: Boolean := False;
10345 Save_Style_Check
: constant Boolean := Style_Check
;
10347 Par_Ent
: Entity_Id
:= Empty
;
10348 Par_Vis
: Boolean := False;
10350 Vis_Prims_List
: Elist_Id
:= No_Elist
;
10351 -- List of primitives made temporarily visible in the instantiation
10352 -- to match the visibility of the formal type
10354 procedure Check_Initialized_Types
;
10355 -- In a generic package body, an entity of a generic private type may
10356 -- appear uninitialized. This is suspicious, unless the actual is a
10357 -- fully initialized type.
10359 -----------------------------
10360 -- Check_Initialized_Types --
10361 -----------------------------
10363 procedure Check_Initialized_Types
is
10365 Formal
: Entity_Id
;
10366 Actual
: Entity_Id
;
10367 Uninit_Var
: Entity_Id
;
10370 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
10371 while Present
(Decl
) loop
10372 Uninit_Var
:= Empty
;
10374 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
10375 Uninit_Var
:= Uninitialized_Variable
(Decl
);
10377 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
10378 and then Nkind
(Formal_Type_Definition
(Decl
)) =
10379 N_Formal_Private_Type_Definition
10382 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
10385 if Present
(Uninit_Var
) then
10386 Formal
:= Defining_Identifier
(Decl
);
10387 Actual
:= First_Entity
(Act_Decl_Id
);
10389 -- For each formal there is a subtype declaration that renames
10390 -- the actual and has the same name as the formal. Locate the
10391 -- formal for warning message about uninitialized variables
10392 -- in the generic, for which the actual type should be a fully
10393 -- initialized type.
10395 while Present
(Actual
) loop
10396 exit when Ekind
(Actual
) = E_Package
10397 and then Present
(Renamed_Object
(Actual
));
10399 if Chars
(Actual
) = Chars
(Formal
)
10400 and then not Is_Scalar_Type
(Actual
)
10401 and then not Is_Fully_Initialized_Type
(Actual
)
10402 and then Warn_On_No_Value_Assigned
10404 Error_Msg_Node_2
:= Formal
;
10406 ("generic unit has uninitialized variable& of "
10407 & "formal private type &?v?", Actual
, Uninit_Var
);
10409 ("actual type for& should be fully initialized type?v?",
10414 Next_Entity
(Actual
);
10420 end Check_Initialized_Types
;
10422 -- Start of processing for Instantiate_Package_Body
10425 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10427 -- The instance body may already have been processed, as the parent of
10428 -- another instance that is inlined (Load_Parent_Of_Generic).
10430 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
10434 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
10436 -- Re-establish the state of information on which checks are suppressed.
10437 -- This information was set in Body_Info at the point of instantiation,
10438 -- and now we restore it so that the instance is compiled using the
10439 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10441 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
10442 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
10443 Opt
.Ada_Version
:= Body_Info
.Version
;
10444 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
10445 Restore_Warnings
(Body_Info
.Warnings
);
10446 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
10447 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
10449 if No
(Gen_Body_Id
) then
10451 -- Do not look for parent of generic body if none is required.
10452 -- This may happen when the routine is called as part of the
10453 -- Pending_Instantiations processing, when nested instances
10454 -- may precede the one generated from the main unit.
10456 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
10457 and then Body_Optional
10461 Load_Parent_Of_Generic
10462 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
10463 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10467 -- Establish global variable for sloc adjustment and for error recovery
10469 Instantiation_Node
:= Inst_Node
;
10471 if Present
(Gen_Body_Id
) then
10472 Save_Env
(Gen_Unit
, Act_Decl_Id
);
10473 Style_Check
:= False;
10474 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
10476 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
10478 Create_Instantiation_Source
10479 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
10483 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
10485 -- Build new name (possibly qualified) for body declaration
10487 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
10489 -- Some attributes of spec entity are not inherited by body entity
10491 Set_Handler_Records
(Act_Body_Id
, No_List
);
10493 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
10494 N_Defining_Program_Unit_Name
10497 Make_Defining_Program_Unit_Name
(Loc
,
10498 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
10499 Defining_Identifier
=> Act_Body_Id
);
10501 Act_Body_Name
:= Act_Body_Id
;
10504 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
10506 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
10507 Check_Generic_Actuals
(Act_Decl_Id
, False);
10508 Check_Initialized_Types
;
10510 -- Install primitives hidden at the point of the instantiation but
10511 -- visible when processing the generic formals
10517 E
:= First_Entity
(Act_Decl_Id
);
10518 while Present
(E
) loop
10520 and then Is_Generic_Actual_Type
(E
)
10521 and then Is_Tagged_Type
(E
)
10523 Install_Hidden_Primitives
10524 (Prims_List
=> Vis_Prims_List
,
10525 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
10533 -- If it is a child unit, make the parent instance (which is an
10534 -- instance of the parent of the generic) visible. The parent
10535 -- instance is the prefix of the name of the generic unit.
10537 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10538 and then Nkind
(Gen_Id
) = N_Expanded_Name
10540 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10541 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10542 Install_Parent
(Par_Ent
, In_Body
=> True);
10543 Parent_Installed
:= True;
10545 elsif Is_Child_Unit
(Gen_Unit
) then
10546 Par_Ent
:= Scope
(Gen_Unit
);
10547 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10548 Install_Parent
(Par_Ent
, In_Body
=> True);
10549 Parent_Installed
:= True;
10552 -- If the instantiation is a library unit, and this is the main unit,
10553 -- then build the resulting compilation unit nodes for the instance.
10554 -- If this is a compilation unit but it is not the main unit, then it
10555 -- is the body of a unit in the context, that is being compiled
10556 -- because it is encloses some inlined unit or another generic unit
10557 -- being instantiated. In that case, this body is not part of the
10558 -- current compilation, and is not attached to the tree, but its
10559 -- parent must be set for analysis.
10561 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10563 -- Replace instance node with body of instance, and create new
10564 -- node for corresponding instance declaration.
10566 Build_Instance_Compilation_Unit_Nodes
10567 (Inst_Node
, Act_Body
, Act_Decl
);
10568 Analyze
(Inst_Node
);
10570 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10572 -- If the instance is a child unit itself, then set the scope
10573 -- of the expanded body to be the parent of the instantiation
10574 -- (ensuring that the fully qualified name will be generated
10575 -- for the elaboration subprogram).
10577 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
10578 N_Defining_Program_Unit_Name
10581 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
10585 -- Case where instantiation is not a library unit
10588 -- If this is an early instantiation, i.e. appears textually
10589 -- before the corresponding body and must be elaborated first,
10590 -- indicate that the body instance is to be delayed.
10592 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
10594 -- Now analyze the body. We turn off all checks if this is an
10595 -- internal unit, since there is no reason to have checks on for
10596 -- any predefined run-time library code. All such code is designed
10597 -- to be compiled with checks off.
10599 -- Note that we do NOT apply this criterion to children of GNAT
10600 -- The latter units must suppress checks explicitly if needed.
10602 if Is_Predefined_File_Name
10603 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
10605 Analyze
(Act_Body
, Suppress
=> All_Checks
);
10607 Analyze
(Act_Body
);
10611 Inherit_Context
(Gen_Body
, Inst_Node
);
10613 -- Remove the parent instances if they have been placed on the scope
10614 -- stack to compile the body.
10616 if Parent_Installed
then
10617 Remove_Parent
(In_Body
=> True);
10619 -- Restore the previous visibility of the parent
10621 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10624 Restore_Hidden_Primitives
(Vis_Prims_List
);
10625 Restore_Private_Views
(Act_Decl_Id
);
10627 -- Remove the current unit from visibility if this is an instance
10628 -- that is not elaborated on the fly for inlining purposes.
10630 if not Inlined_Body
then
10631 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
10635 Style_Check
:= Save_Style_Check
;
10637 -- If we have no body, and the unit requires a body, then complain. This
10638 -- complaint is suppressed if we have detected other errors (since a
10639 -- common reason for missing the body is that it had errors).
10640 -- In CodePeer mode, a warning has been emitted already, no need for
10641 -- further messages.
10643 elsif Unit_Requires_Body
(Gen_Unit
)
10644 and then not Body_Optional
10646 if CodePeer_Mode
then
10649 elsif Serious_Errors_Detected
= 0 then
10651 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
10653 -- Don't attempt to perform any cleanup actions if some other error
10654 -- was already detected, since this can cause blowups.
10660 -- Case of package that does not need a body
10663 -- If the instantiation of the declaration is a library unit, rewrite
10664 -- the original package instantiation as a package declaration in the
10665 -- compilation unit node.
10667 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10668 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
10669 Rewrite
(Inst_Node
, Act_Decl
);
10671 -- Generate elaboration entity, in case spec has elaboration code.
10672 -- This cannot be done when the instance is analyzed, because it
10673 -- is not known yet whether the body exists.
10675 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
10676 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
10678 -- If the instantiation is not a library unit, then append the
10679 -- declaration to the list of implicitly generated entities, unless
10680 -- it is already a list member which means that it was already
10683 elsif not Is_List_Member
(Act_Decl
) then
10684 Mark_Rewrite_Insertion
(Act_Decl
);
10685 Insert_Before
(Inst_Node
, Act_Decl
);
10689 Expander_Mode_Restore
;
10690 end Instantiate_Package_Body
;
10692 ---------------------------------
10693 -- Instantiate_Subprogram_Body --
10694 ---------------------------------
10696 procedure Instantiate_Subprogram_Body
10697 (Body_Info
: Pending_Body_Info
;
10698 Body_Optional
: Boolean := False)
10700 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
10701 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
10702 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
10703 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
10704 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
10705 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
10706 Anon_Id
: constant Entity_Id
:=
10707 Defining_Unit_Name
(Specification
(Act_Decl
));
10708 Pack_Id
: constant Entity_Id
:=
10709 Defining_Unit_Name
(Parent
(Act_Decl
));
10711 Gen_Body
: Node_Id
;
10712 Gen_Body_Id
: Node_Id
;
10713 Act_Body
: Node_Id
;
10714 Pack_Body
: Node_Id
;
10715 Prev_Formal
: Entity_Id
;
10716 Ret_Expr
: Node_Id
;
10717 Unit_Renaming
: Node_Id
;
10719 Parent_Installed
: Boolean := False;
10721 Saved_Style_Check
: constant Boolean := Style_Check
;
10722 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
10724 Par_Ent
: Entity_Id
:= Empty
;
10725 Par_Vis
: Boolean := False;
10728 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10730 -- Subprogram body may have been created already because of an inline
10731 -- pragma, or because of multiple elaborations of the enclosing package
10732 -- when several instances of the subprogram appear in the main unit.
10734 if Present
(Corresponding_Body
(Act_Decl
)) then
10738 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
10740 -- Re-establish the state of information on which checks are suppressed.
10741 -- This information was set in Body_Info at the point of instantiation,
10742 -- and now we restore it so that the instance is compiled using the
10743 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10745 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
10746 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
10747 Opt
.Ada_Version
:= Body_Info
.Version
;
10748 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
10749 Restore_Warnings
(Body_Info
.Warnings
);
10750 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
10751 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
10753 if No
(Gen_Body_Id
) then
10755 -- For imported generic subprogram, no body to compile, complete
10756 -- the spec entity appropriately.
10758 if Is_Imported
(Gen_Unit
) then
10759 Set_Is_Imported
(Anon_Id
);
10760 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
10761 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
10762 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
10763 Set_Has_Completion
(Anon_Id
);
10766 -- For other cases, compile the body
10769 Load_Parent_Of_Generic
10770 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
10771 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10775 Instantiation_Node
:= Inst_Node
;
10777 if Present
(Gen_Body_Id
) then
10778 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
10780 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
10782 -- Either body is not present, or context is non-expanding, as
10783 -- when compiling a subunit. Mark the instance as completed, and
10784 -- diagnose a missing body when needed.
10787 and then Operating_Mode
= Generate_Code
10790 ("missing proper body for instantiation", Gen_Body
);
10793 Set_Has_Completion
(Anon_Id
);
10797 Save_Env
(Gen_Unit
, Anon_Id
);
10798 Style_Check
:= False;
10799 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
10800 Create_Instantiation_Source
10808 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
10810 -- Create proper defining name for the body, to correspond to
10811 -- the one in the spec.
10813 Set_Defining_Unit_Name
(Specification
(Act_Body
),
10814 Make_Defining_Identifier
10815 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
10816 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
10817 Set_Has_Completion
(Anon_Id
);
10818 Check_Generic_Actuals
(Pack_Id
, False);
10820 -- Generate a reference to link the visible subprogram instance to
10821 -- the generic body, which for navigation purposes is the only
10822 -- available source for the instance.
10825 (Related_Instance
(Pack_Id
),
10826 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
10828 -- If it is a child unit, make the parent instance (which is an
10829 -- instance of the parent of the generic) visible. The parent
10830 -- instance is the prefix of the name of the generic unit.
10832 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10833 and then Nkind
(Gen_Id
) = N_Expanded_Name
10835 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10836 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10837 Install_Parent
(Par_Ent
, In_Body
=> True);
10838 Parent_Installed
:= True;
10840 elsif Is_Child_Unit
(Gen_Unit
) then
10841 Par_Ent
:= Scope
(Gen_Unit
);
10842 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10843 Install_Parent
(Par_Ent
, In_Body
=> True);
10844 Parent_Installed
:= True;
10847 -- Inside its body, a reference to the generic unit is a reference
10848 -- to the instance. The corresponding renaming is the first
10849 -- declaration in the body.
10852 Make_Subprogram_Renaming_Declaration
(Loc
,
10854 Copy_Generic_Node
(
10855 Specification
(Original_Node
(Gen_Body
)),
10857 Instantiating
=> True),
10858 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
10860 -- If there is a formal subprogram with the same name as the unit
10861 -- itself, do not add this renaming declaration. This is a temporary
10862 -- fix for one ACVC test. ???
10864 Prev_Formal
:= First_Entity
(Pack_Id
);
10865 while Present
(Prev_Formal
) loop
10866 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
10867 and then Is_Overloadable
(Prev_Formal
)
10872 Next_Entity
(Prev_Formal
);
10875 if Present
(Prev_Formal
) then
10876 Decls
:= New_List
(Act_Body
);
10878 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
10881 -- The subprogram body is placed in the body of a dummy package body,
10882 -- whose spec contains the subprogram declaration as well as the
10883 -- renaming declarations for the generic parameters.
10885 Pack_Body
:= Make_Package_Body
(Loc
,
10886 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
10887 Declarations
=> Decls
);
10889 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
10891 -- If the instantiation is a library unit, then build resulting
10892 -- compilation unit nodes for the instance. The declaration of
10893 -- the enclosing package is the grandparent of the subprogram
10894 -- declaration. First replace the instantiation node as the unit
10895 -- of the corresponding compilation.
10897 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10898 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10899 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
10900 Build_Instance_Compilation_Unit_Nodes
10901 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
10902 Analyze
(Inst_Node
);
10904 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
10905 Analyze
(Pack_Body
);
10909 Insert_Before
(Inst_Node
, Pack_Body
);
10910 Mark_Rewrite_Insertion
(Pack_Body
);
10911 Analyze
(Pack_Body
);
10913 if Expander_Active
then
10914 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
10918 Inherit_Context
(Gen_Body
, Inst_Node
);
10920 Restore_Private_Views
(Pack_Id
, False);
10922 if Parent_Installed
then
10923 Remove_Parent
(In_Body
=> True);
10925 -- Restore the previous visibility of the parent
10927 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10931 Style_Check
:= Saved_Style_Check
;
10932 Restore_Warnings
(Saved_Warnings
);
10934 -- Body not found. Error was emitted already. If there were no previous
10935 -- errors, this may be an instance whose scope is a premature instance.
10936 -- In that case we must insure that the (legal) program does raise
10937 -- program error if executed. We generate a subprogram body for this
10938 -- purpose. See DEC ac30vso.
10940 -- Should not reference proprietary DEC tests in comments ???
10942 elsif Serious_Errors_Detected
= 0
10943 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
10945 if Body_Optional
then
10948 elsif Ekind
(Anon_Id
) = E_Procedure
then
10950 Make_Subprogram_Body
(Loc
,
10952 Make_Procedure_Specification
(Loc
,
10953 Defining_Unit_Name
=>
10954 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10955 Parameter_Specifications
=>
10957 (Parameter_Specifications
(Parent
(Anon_Id
)))),
10959 Declarations
=> Empty_List
,
10960 Handled_Statement_Sequence
=>
10961 Make_Handled_Sequence_Of_Statements
(Loc
,
10964 Make_Raise_Program_Error
(Loc
,
10966 PE_Access_Before_Elaboration
))));
10970 Make_Raise_Program_Error
(Loc
,
10971 Reason
=> PE_Access_Before_Elaboration
);
10973 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
10974 Set_Analyzed
(Ret_Expr
);
10977 Make_Subprogram_Body
(Loc
,
10979 Make_Function_Specification
(Loc
,
10980 Defining_Unit_Name
=>
10981 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10982 Parameter_Specifications
=>
10984 (Parameter_Specifications
(Parent
(Anon_Id
))),
10985 Result_Definition
=>
10986 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
10988 Declarations
=> Empty_List
,
10989 Handled_Statement_Sequence
=>
10990 Make_Handled_Sequence_Of_Statements
(Loc
,
10993 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
10996 Pack_Body
:= Make_Package_Body
(Loc
,
10997 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
10998 Declarations
=> New_List
(Act_Body
));
11000 Insert_After
(Inst_Node
, Pack_Body
);
11001 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
11002 Analyze
(Pack_Body
);
11005 Expander_Mode_Restore
;
11006 end Instantiate_Subprogram_Body
;
11008 ----------------------
11009 -- Instantiate_Type --
11010 ----------------------
11012 function Instantiate_Type
11015 Analyzed_Formal
: Node_Id
;
11016 Actual_Decls
: List_Id
) return List_Id
11018 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11019 A_Gen_T
: constant Entity_Id
:=
11020 Defining_Identifier
(Analyzed_Formal
);
11021 Ancestor
: Entity_Id
:= Empty
;
11022 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
11024 Decl_Node
: Node_Id
;
11025 Decl_Nodes
: List_Id
;
11029 procedure Diagnose_Predicated_Actual
;
11030 -- There are a number of constructs in which a discrete type with
11031 -- predicates is illegal, e.g. as an index in an array type declaration.
11032 -- If a generic type is used is such a construct in a generic package
11033 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
11034 -- of the generic contract that the actual cannot have predicates.
11036 procedure Validate_Array_Type_Instance
;
11037 procedure Validate_Access_Subprogram_Instance
;
11038 procedure Validate_Access_Type_Instance
;
11039 procedure Validate_Derived_Type_Instance
;
11040 procedure Validate_Derived_Interface_Type_Instance
;
11041 procedure Validate_Discriminated_Formal_Type
;
11042 procedure Validate_Interface_Type_Instance
;
11043 procedure Validate_Private_Type_Instance
;
11044 procedure Validate_Incomplete_Type_Instance
;
11045 -- These procedures perform validation tests for the named case.
11046 -- Validate_Discriminated_Formal_Type is shared by formal private
11047 -- types and Ada 2012 formal incomplete types.
11049 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
11050 -- Check that base types are the same and that the subtypes match
11051 -- statically. Used in several of the above.
11053 ---------------------------------
11054 -- Diagnose_Predicated_Actual --
11055 ---------------------------------
11057 procedure Diagnose_Predicated_Actual
is
11059 if No_Predicate_On_Actual
(A_Gen_T
)
11060 and then Has_Predicates
(Act_T
)
11063 ("actual for& cannot be a type with predicate",
11064 Instantiation_Node
, A_Gen_T
);
11066 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
11067 and then Has_Predicates
(Act_T
)
11068 and then not Has_Static_Predicate_Aspect
(Act_T
)
11071 ("actual for& cannot be a type with a dynamic predicate",
11072 Instantiation_Node
, A_Gen_T
);
11074 end Diagnose_Predicated_Actual
;
11076 --------------------
11077 -- Subtypes_Match --
11078 --------------------
11080 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
11081 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
11084 -- Some detailed comments would be useful here ???
11086 return ((Base_Type
(T
) = Act_T
11087 or else Base_Type
(T
) = Base_Type
(Act_T
))
11088 and then Subtypes_Statically_Match
(T
, Act_T
))
11090 or else (Is_Class_Wide_Type
(Gen_T
)
11091 and then Is_Class_Wide_Type
(Act_T
)
11092 and then Subtypes_Match
11093 (Get_Instance_Of
(Root_Type
(Gen_T
)),
11094 Root_Type
(Act_T
)))
11097 (Ekind_In
(Gen_T
, E_Anonymous_Access_Subprogram_Type
,
11098 E_Anonymous_Access_Type
)
11099 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
11100 and then Subtypes_Statically_Match
11101 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
11102 end Subtypes_Match
;
11104 -----------------------------------------
11105 -- Validate_Access_Subprogram_Instance --
11106 -----------------------------------------
11108 procedure Validate_Access_Subprogram_Instance
is
11110 if not Is_Access_Type
(Act_T
)
11111 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
11114 ("expect access type in instantiation of &", Actual
, Gen_T
);
11115 Abandon_Instantiation
(Actual
);
11118 -- According to AI05-288, actuals for access_to_subprograms must be
11119 -- subtype conformant with the generic formal. Previous to AI05-288
11120 -- only mode conformance was required.
11122 -- This is a binding interpretation that applies to previous versions
11123 -- of the language, no need to maintain previous weaker checks.
11125 Check_Subtype_Conformant
11126 (Designated_Type
(Act_T
),
11127 Designated_Type
(A_Gen_T
),
11131 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
11132 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
11134 ("protected access type not allowed for formal &",
11138 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
11140 ("expect protected access type for formal &",
11143 end Validate_Access_Subprogram_Instance
;
11145 -----------------------------------
11146 -- Validate_Access_Type_Instance --
11147 -----------------------------------
11149 procedure Validate_Access_Type_Instance
is
11150 Desig_Type
: constant Entity_Id
:=
11151 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
11152 Desig_Act
: Entity_Id
;
11155 if not Is_Access_Type
(Act_T
) then
11157 ("expect access type in instantiation of &", Actual
, Gen_T
);
11158 Abandon_Instantiation
(Actual
);
11161 if Is_Access_Constant
(A_Gen_T
) then
11162 if not Is_Access_Constant
(Act_T
) then
11164 ("actual type must be access-to-constant type", Actual
);
11165 Abandon_Instantiation
(Actual
);
11168 if Is_Access_Constant
(Act_T
) then
11170 ("actual type must be access-to-variable type", Actual
);
11171 Abandon_Instantiation
(Actual
);
11173 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
11174 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
11176 Error_Msg_N
-- CODEFIX
11177 ("actual must be general access type!", Actual
);
11178 Error_Msg_NE
-- CODEFIX
11179 ("add ALL to }!", Actual
, Act_T
);
11180 Abandon_Instantiation
(Actual
);
11184 -- The designated subtypes, that is to say the subtypes introduced
11185 -- by an access type declaration (and not by a subtype declaration)
11188 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
11190 -- The designated type may have been introduced through a limited_
11191 -- with clause, in which case retrieve the non-limited view. This
11192 -- applies to incomplete types as well as to class-wide types.
11194 if From_Limited_With
(Desig_Act
) then
11195 Desig_Act
:= Available_View
(Desig_Act
);
11198 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
11200 ("designated type of actual does not match that of formal &",
11203 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
11204 Error_Msg_N
("\predicates do not match", Actual
);
11207 Abandon_Instantiation
(Actual
);
11209 elsif Is_Access_Type
(Designated_Type
(Act_T
))
11210 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
11212 Is_Constrained
(Designated_Type
(Desig_Type
))
11215 ("designated type of actual does not match that of formal &",
11218 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
11219 Error_Msg_N
("\predicates do not match", Actual
);
11222 Abandon_Instantiation
(Actual
);
11225 -- Ada 2005: null-exclusion indicators of the two types must agree
11227 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
11229 ("non null exclusion of actual and formal & do not match",
11232 end Validate_Access_Type_Instance
;
11234 ----------------------------------
11235 -- Validate_Array_Type_Instance --
11236 ----------------------------------
11238 procedure Validate_Array_Type_Instance
is
11243 function Formal_Dimensions
return Int
;
11244 -- Count number of dimensions in array type formal
11246 -----------------------
11247 -- Formal_Dimensions --
11248 -----------------------
11250 function Formal_Dimensions
return Int
is
11255 if Nkind
(Def
) = N_Constrained_Array_Definition
then
11256 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
11258 Index
:= First
(Subtype_Marks
(Def
));
11261 while Present
(Index
) loop
11263 Next_Index
(Index
);
11267 end Formal_Dimensions
;
11269 -- Start of processing for Validate_Array_Type_Instance
11272 if not Is_Array_Type
(Act_T
) then
11274 ("expect array type in instantiation of &", Actual
, Gen_T
);
11275 Abandon_Instantiation
(Actual
);
11277 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
11278 if not (Is_Constrained
(Act_T
)) then
11280 ("expect constrained array in instantiation of &",
11282 Abandon_Instantiation
(Actual
);
11286 if Is_Constrained
(Act_T
) then
11288 ("expect unconstrained array in instantiation of &",
11290 Abandon_Instantiation
(Actual
);
11294 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
11296 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
11297 Abandon_Instantiation
(Actual
);
11300 I1
:= First_Index
(A_Gen_T
);
11301 I2
:= First_Index
(Act_T
);
11302 for J
in 1 .. Formal_Dimensions
loop
11304 -- If the indexes of the actual were given by a subtype_mark,
11305 -- the index was transformed into a range attribute. Retrieve
11306 -- the original type mark for checking.
11308 if Is_Entity_Name
(Original_Node
(I2
)) then
11309 T2
:= Entity
(Original_Node
(I2
));
11314 if not Subtypes_Match
11315 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
11318 ("index types of actual do not match those of formal &",
11320 Abandon_Instantiation
(Actual
);
11327 -- Check matching subtypes. Note that there are complex visibility
11328 -- issues when the generic is a child unit and some aspect of the
11329 -- generic type is declared in a parent unit of the generic. We do
11330 -- the test to handle this special case only after a direct check
11331 -- for static matching has failed. The case where both the component
11332 -- type and the array type are separate formals, and the component
11333 -- type is a private view may also require special checking in
11337 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
11340 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
11341 Component_Type
(Act_T
))
11346 ("component subtype of actual does not match that of formal &",
11348 Abandon_Instantiation
(Actual
);
11351 if Has_Aliased_Components
(A_Gen_T
)
11352 and then not Has_Aliased_Components
(Act_T
)
11355 ("actual must have aliased components to match formal type &",
11358 end Validate_Array_Type_Instance
;
11360 -----------------------------------------------
11361 -- Validate_Derived_Interface_Type_Instance --
11362 -----------------------------------------------
11364 procedure Validate_Derived_Interface_Type_Instance
is
11365 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
11369 -- First apply interface instance checks
11371 Validate_Interface_Type_Instance
;
11373 -- Verify that immediate parent interface is an ancestor of
11377 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
11380 ("interface actual must include progenitor&", Actual
, Par
);
11383 -- Now verify that the actual includes all other ancestors of
11386 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
11387 while Present
(Elmt
) loop
11388 if not Interface_Present_In_Ancestor
11389 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
11392 ("interface actual must include progenitor&",
11393 Actual
, Node
(Elmt
));
11398 end Validate_Derived_Interface_Type_Instance
;
11400 ------------------------------------
11401 -- Validate_Derived_Type_Instance --
11402 ------------------------------------
11404 procedure Validate_Derived_Type_Instance
is
11405 Actual_Discr
: Entity_Id
;
11406 Ancestor_Discr
: Entity_Id
;
11409 -- If the parent type in the generic declaration is itself a previous
11410 -- formal type, then it is local to the generic and absent from the
11411 -- analyzed generic definition. In that case the ancestor is the
11412 -- instance of the formal (which must have been instantiated
11413 -- previously), unless the ancestor is itself a formal derived type.
11414 -- In this latter case (which is the subject of Corrigendum 8652/0038
11415 -- (AI-202) the ancestor of the formals is the ancestor of its
11416 -- parent. Otherwise, the analyzed generic carries the parent type.
11417 -- If the parent type is defined in a previous formal package, then
11418 -- the scope of that formal package is that of the generic type
11419 -- itself, and it has already been mapped into the corresponding type
11420 -- in the actual package.
11422 -- Common case: parent type defined outside of the generic
11424 if Is_Entity_Name
(Subtype_Mark
(Def
))
11425 and then Present
(Entity
(Subtype_Mark
(Def
)))
11427 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
11429 -- Check whether parent is defined in a previous formal package
11432 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
11435 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
11437 -- The type may be a local derivation, or a type extension of a
11438 -- previous formal, or of a formal of a parent package.
11440 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
11442 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
11444 -- Check whether the parent is another derived formal type in the
11445 -- same generic unit.
11447 if Etype
(A_Gen_T
) /= A_Gen_T
11448 and then Is_Generic_Type
(Etype
(A_Gen_T
))
11449 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
11450 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
11452 -- Locate ancestor of parent from the subtype declaration
11453 -- created for the actual.
11459 Decl
:= First
(Actual_Decls
);
11460 while Present
(Decl
) loop
11461 if Nkind
(Decl
) = N_Subtype_Declaration
11462 and then Chars
(Defining_Identifier
(Decl
)) =
11463 Chars
(Etype
(A_Gen_T
))
11465 Ancestor
:= Generic_Parent_Type
(Decl
);
11473 pragma Assert
(Present
(Ancestor
));
11475 -- The ancestor itself may be a previous formal that has been
11478 Ancestor
:= Get_Instance_Of
(Ancestor
);
11482 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
11485 -- An unusual case: the actual is a type declared in a parent unit,
11486 -- but is not a formal type so there is no instance_of for it.
11487 -- Retrieve it by analyzing the record extension.
11489 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
11490 and then In_Open_Scopes
(Scope
(Act_T
))
11491 and then Is_Generic_Instance
(Scope
(Act_T
))
11493 Analyze
(Subtype_Mark
(Def
));
11494 Ancestor
:= Entity
(Subtype_Mark
(Def
));
11497 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
11500 -- If the formal derived type has pragma Preelaborable_Initialization
11501 -- then the actual type must have preelaborable initialization.
11503 if Known_To_Have_Preelab_Init
(A_Gen_T
)
11504 and then not Has_Preelaborable_Initialization
(Act_T
)
11507 ("actual for & must have preelaborable initialization",
11511 -- Ada 2005 (AI-251)
11513 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
11514 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
11516 ("(Ada 2005) expected type implementing & in instantiation",
11520 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
11522 ("expect type derived from & in instantiation",
11523 Actual
, First_Subtype
(Ancestor
));
11524 Abandon_Instantiation
(Actual
);
11527 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
11528 -- that the formal type declaration has been rewritten as a private
11531 if Ada_Version
>= Ada_2005
11532 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
11533 and then Synchronized_Present
(Parent
(A_Gen_T
))
11535 -- The actual must be a synchronized tagged type
11537 if not Is_Tagged_Type
(Act_T
) then
11539 ("actual of synchronized type must be tagged", Actual
);
11540 Abandon_Instantiation
(Actual
);
11542 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
11543 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
11544 N_Derived_Type_Definition
11545 and then not Synchronized_Present
(Type_Definition
11549 ("actual of synchronized type must be synchronized", Actual
);
11550 Abandon_Instantiation
(Actual
);
11554 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
11555 -- removes the second instance of the phrase "or allow pass by copy".
11557 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
11559 ("cannot have atomic actual type for non-atomic formal type",
11562 elsif Is_Volatile
(Act_T
) and then not Is_Volatile
(Ancestor
) then
11564 ("cannot have volatile actual type for non-volatile formal type",
11568 -- It should not be necessary to check for unknown discriminants on
11569 -- Formal, but for some reason Has_Unknown_Discriminants is false for
11570 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
11571 -- needs fixing. ???
11573 if not Is_Indefinite_Subtype
(A_Gen_T
)
11574 and then not Unknown_Discriminants_Present
(Formal
)
11575 and then Is_Indefinite_Subtype
(Act_T
)
11578 ("actual subtype must be constrained", Actual
);
11579 Abandon_Instantiation
(Actual
);
11582 if not Unknown_Discriminants_Present
(Formal
) then
11583 if Is_Constrained
(Ancestor
) then
11584 if not Is_Constrained
(Act_T
) then
11586 ("actual subtype must be constrained", Actual
);
11587 Abandon_Instantiation
(Actual
);
11590 -- Ancestor is unconstrained, Check if generic formal and actual
11591 -- agree on constrainedness. The check only applies to array types
11592 -- and discriminated types.
11594 elsif Is_Constrained
(Act_T
) then
11595 if Ekind
(Ancestor
) = E_Access_Type
11596 or else (not Is_Constrained
(A_Gen_T
)
11597 and then Is_Composite_Type
(A_Gen_T
))
11599 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
11600 Abandon_Instantiation
(Actual
);
11603 -- A class-wide type is only allowed if the formal has unknown
11606 elsif Is_Class_Wide_Type
(Act_T
)
11607 and then not Has_Unknown_Discriminants
(Ancestor
)
11610 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
11611 Abandon_Instantiation
(Actual
);
11613 -- Otherwise, the formal and actual must have the same number
11614 -- of discriminants and each discriminant of the actual must
11615 -- correspond to a discriminant of the formal.
11617 elsif Has_Discriminants
(Act_T
)
11618 and then not Has_Unknown_Discriminants
(Act_T
)
11619 and then Has_Discriminants
(Ancestor
)
11621 Actual_Discr
:= First_Discriminant
(Act_T
);
11622 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
11623 while Present
(Actual_Discr
)
11624 and then Present
(Ancestor_Discr
)
11626 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
11627 No
(Corresponding_Discriminant
(Actual_Discr
))
11630 ("discriminant & does not correspond " &
11631 "to ancestor discriminant", Actual
, Actual_Discr
);
11632 Abandon_Instantiation
(Actual
);
11635 Next_Discriminant
(Actual_Discr
);
11636 Next_Discriminant
(Ancestor_Discr
);
11639 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
11641 ("actual for & must have same number of discriminants",
11643 Abandon_Instantiation
(Actual
);
11646 -- This case should be caught by the earlier check for
11647 -- constrainedness, but the check here is added for completeness.
11649 elsif Has_Discriminants
(Act_T
)
11650 and then not Has_Unknown_Discriminants
(Act_T
)
11653 ("actual for & must not have discriminants", Actual
, Gen_T
);
11654 Abandon_Instantiation
(Actual
);
11656 elsif Has_Discriminants
(Ancestor
) then
11658 ("actual for & must have known discriminants", Actual
, Gen_T
);
11659 Abandon_Instantiation
(Actual
);
11662 if not Subtypes_Statically_Compatible
11663 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
11666 ("constraint on actual is incompatible with formal", Actual
);
11667 Abandon_Instantiation
(Actual
);
11671 -- If the formal and actual types are abstract, check that there
11672 -- are no abstract primitives of the actual type that correspond to
11673 -- nonabstract primitives of the formal type (second sentence of
11676 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
11677 Check_Abstract_Primitives
: declare
11678 Gen_Prims
: constant Elist_Id
:=
11679 Primitive_Operations
(A_Gen_T
);
11680 Gen_Elmt
: Elmt_Id
;
11681 Gen_Subp
: Entity_Id
;
11682 Anc_Subp
: Entity_Id
;
11683 Anc_Formal
: Entity_Id
;
11684 Anc_F_Type
: Entity_Id
;
11686 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
11687 Act_Elmt
: Elmt_Id
;
11688 Act_Subp
: Entity_Id
;
11689 Act_Formal
: Entity_Id
;
11690 Act_F_Type
: Entity_Id
;
11692 Subprograms_Correspond
: Boolean;
11694 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
11695 -- Returns true if T2 is derived directly or indirectly from
11696 -- T1, including derivations from interfaces. T1 and T2 are
11697 -- required to be specific tagged base types.
11699 ------------------------
11700 -- Is_Tagged_Ancestor --
11701 ------------------------
11703 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
11705 Intfc_Elmt
: Elmt_Id
;
11708 -- The predicate is satisfied if the types are the same
11713 -- If we've reached the top of the derivation chain then
11714 -- we know that T1 is not an ancestor of T2.
11716 elsif Etype
(T2
) = T2
then
11719 -- Proceed to check T2's immediate parent
11721 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
11724 -- Finally, check to see if T1 is an ancestor of any of T2's
11728 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
11729 while Present
(Intfc_Elmt
) loop
11730 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
11734 Next_Elmt
(Intfc_Elmt
);
11739 end Is_Tagged_Ancestor
;
11741 -- Start of processing for Check_Abstract_Primitives
11744 -- Loop over all of the formal derived type's primitives
11746 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
11747 while Present
(Gen_Elmt
) loop
11748 Gen_Subp
:= Node
(Gen_Elmt
);
11750 -- If the primitive of the formal is not abstract, then
11751 -- determine whether there is a corresponding primitive of
11752 -- the actual type that's abstract.
11754 if not Is_Abstract_Subprogram
(Gen_Subp
) then
11755 Act_Elmt
:= First_Elmt
(Act_Prims
);
11756 while Present
(Act_Elmt
) loop
11757 Act_Subp
:= Node
(Act_Elmt
);
11759 -- If we find an abstract primitive of the actual,
11760 -- then we need to test whether it corresponds to the
11761 -- subprogram from which the generic formal primitive
11764 if Is_Abstract_Subprogram
(Act_Subp
) then
11765 Anc_Subp
:= Alias
(Gen_Subp
);
11767 -- Test whether we have a corresponding primitive
11768 -- by comparing names, kinds, formal types, and
11771 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
11772 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
11774 Anc_Formal
:= First_Formal
(Anc_Subp
);
11775 Act_Formal
:= First_Formal
(Act_Subp
);
11776 while Present
(Anc_Formal
)
11777 and then Present
(Act_Formal
)
11779 Anc_F_Type
:= Etype
(Anc_Formal
);
11780 Act_F_Type
:= Etype
(Act_Formal
);
11782 if Ekind
(Anc_F_Type
)
11783 = E_Anonymous_Access_Type
11785 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
11787 if Ekind
(Act_F_Type
)
11788 = E_Anonymous_Access_Type
11791 Designated_Type
(Act_F_Type
);
11797 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
11802 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11803 Act_F_Type
:= Base_Type
(Act_F_Type
);
11805 -- If the formal is controlling, then the
11806 -- the type of the actual primitive's formal
11807 -- must be derived directly or indirectly
11808 -- from the type of the ancestor primitive's
11811 if Is_Controlling_Formal
(Anc_Formal
) then
11812 if not Is_Tagged_Ancestor
11813 (Anc_F_Type
, Act_F_Type
)
11818 -- Otherwise the types of the formals must
11821 elsif Anc_F_Type
/= Act_F_Type
then
11825 Next_Entity
(Anc_Formal
);
11826 Next_Entity
(Act_Formal
);
11829 -- If we traversed through all of the formals
11830 -- then so far the subprograms correspond, so
11831 -- now check that any result types correspond.
11833 if No
(Anc_Formal
) and then No
(Act_Formal
) then
11834 Subprograms_Correspond
:= True;
11836 if Ekind
(Act_Subp
) = E_Function
then
11837 Anc_F_Type
:= Etype
(Anc_Subp
);
11838 Act_F_Type
:= Etype
(Act_Subp
);
11840 if Ekind
(Anc_F_Type
)
11841 = E_Anonymous_Access_Type
11844 Designated_Type
(Anc_F_Type
);
11846 if Ekind
(Act_F_Type
)
11847 = E_Anonymous_Access_Type
11850 Designated_Type
(Act_F_Type
);
11852 Subprograms_Correspond
:= False;
11857 = E_Anonymous_Access_Type
11859 Subprograms_Correspond
:= False;
11862 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11863 Act_F_Type
:= Base_Type
(Act_F_Type
);
11865 -- Now either the result types must be
11866 -- the same or, if the result type is
11867 -- controlling, the result type of the
11868 -- actual primitive must descend from the
11869 -- result type of the ancestor primitive.
11871 if Subprograms_Correspond
11872 and then Anc_F_Type
/= Act_F_Type
11874 Has_Controlling_Result
(Anc_Subp
)
11876 not Is_Tagged_Ancestor
11877 (Anc_F_Type
, Act_F_Type
)
11879 Subprograms_Correspond
:= False;
11883 -- Found a matching subprogram belonging to
11884 -- formal ancestor type, so actual subprogram
11885 -- corresponds and this violates 3.9.3(9).
11887 if Subprograms_Correspond
then
11889 ("abstract subprogram & overrides " &
11890 "nonabstract subprogram of ancestor",
11898 Next_Elmt
(Act_Elmt
);
11902 Next_Elmt
(Gen_Elmt
);
11904 end Check_Abstract_Primitives
;
11907 -- Verify that limitedness matches. If parent is a limited
11908 -- interface then the generic formal is not unless declared
11909 -- explicitly so. If not declared limited, the actual cannot be
11910 -- limited (see AI05-0087).
11912 -- Even though this AI is a binding interpretation, we enable the
11913 -- check only in Ada 2012 mode, because this improper construct
11914 -- shows up in user code and in existing B-tests.
11916 if Is_Limited_Type
(Act_T
)
11917 and then not Is_Limited_Type
(A_Gen_T
)
11918 and then Ada_Version
>= Ada_2012
11920 if In_Instance
then
11924 ("actual for non-limited & cannot be a limited type", Actual
,
11926 Explain_Limited_Type
(Act_T
, Actual
);
11927 Abandon_Instantiation
(Actual
);
11930 end Validate_Derived_Type_Instance
;
11932 ----------------------------------------
11933 -- Validate_Discriminated_Formal_Type --
11934 ----------------------------------------
11936 procedure Validate_Discriminated_Formal_Type
is
11937 Formal_Discr
: Entity_Id
;
11938 Actual_Discr
: Entity_Id
;
11939 Formal_Subt
: Entity_Id
;
11942 if Has_Discriminants
(A_Gen_T
) then
11943 if not Has_Discriminants
(Act_T
) then
11945 ("actual for & must have discriminants", Actual
, Gen_T
);
11946 Abandon_Instantiation
(Actual
);
11948 elsif Is_Constrained
(Act_T
) then
11950 ("actual for & must be unconstrained", Actual
, Gen_T
);
11951 Abandon_Instantiation
(Actual
);
11954 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
11955 Actual_Discr
:= First_Discriminant
(Act_T
);
11956 while Formal_Discr
/= Empty
loop
11957 if Actual_Discr
= Empty
then
11959 ("discriminants on actual do not match formal",
11961 Abandon_Instantiation
(Actual
);
11964 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
11966 -- Access discriminants match if designated types do
11968 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
11969 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
11970 E_Anonymous_Access_Type
11973 (Designated_Type
(Base_Type
(Formal_Subt
))) =
11974 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
11978 elsif Base_Type
(Formal_Subt
) /=
11979 Base_Type
(Etype
(Actual_Discr
))
11982 ("types of actual discriminants must match formal",
11984 Abandon_Instantiation
(Actual
);
11986 elsif not Subtypes_Statically_Match
11987 (Formal_Subt
, Etype
(Actual_Discr
))
11988 and then Ada_Version
>= Ada_95
11991 ("subtypes of actual discriminants must match formal",
11993 Abandon_Instantiation
(Actual
);
11996 Next_Discriminant
(Formal_Discr
);
11997 Next_Discriminant
(Actual_Discr
);
12000 if Actual_Discr
/= Empty
then
12002 ("discriminants on actual do not match formal",
12004 Abandon_Instantiation
(Actual
);
12008 end Validate_Discriminated_Formal_Type
;
12010 ---------------------------------------
12011 -- Validate_Incomplete_Type_Instance --
12012 ---------------------------------------
12014 procedure Validate_Incomplete_Type_Instance
is
12016 if not Is_Tagged_Type
(Act_T
)
12017 and then Is_Tagged_Type
(A_Gen_T
)
12020 ("actual for & must be a tagged type", Actual
, Gen_T
);
12023 Validate_Discriminated_Formal_Type
;
12024 end Validate_Incomplete_Type_Instance
;
12026 --------------------------------------
12027 -- Validate_Interface_Type_Instance --
12028 --------------------------------------
12030 procedure Validate_Interface_Type_Instance
is
12032 if not Is_Interface
(Act_T
) then
12034 ("actual for formal interface type must be an interface",
12037 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
12038 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
12039 or else Is_Protected_Interface
(A_Gen_T
) /=
12040 Is_Protected_Interface
(Act_T
)
12041 or else Is_Synchronized_Interface
(A_Gen_T
) /=
12042 Is_Synchronized_Interface
(Act_T
)
12045 ("actual for interface& does not match (RM 12.5.5(4))",
12048 end Validate_Interface_Type_Instance
;
12050 ------------------------------------
12051 -- Validate_Private_Type_Instance --
12052 ------------------------------------
12054 procedure Validate_Private_Type_Instance
is
12056 if Is_Limited_Type
(Act_T
)
12057 and then not Is_Limited_Type
(A_Gen_T
)
12059 if In_Instance
then
12063 ("actual for non-limited & cannot be a limited type", Actual
,
12065 Explain_Limited_Type
(Act_T
, Actual
);
12066 Abandon_Instantiation
(Actual
);
12069 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
12070 and then not Has_Preelaborable_Initialization
(Act_T
)
12073 ("actual for & must have preelaborable initialization", Actual
,
12076 elsif Is_Indefinite_Subtype
(Act_T
)
12077 and then not Is_Indefinite_Subtype
(A_Gen_T
)
12078 and then Ada_Version
>= Ada_95
12081 ("actual for & must be a definite subtype", Actual
, Gen_T
);
12083 elsif not Is_Tagged_Type
(Act_T
)
12084 and then Is_Tagged_Type
(A_Gen_T
)
12087 ("actual for & must be a tagged type", Actual
, Gen_T
);
12090 Validate_Discriminated_Formal_Type
;
12092 end Validate_Private_Type_Instance
;
12094 -- Start of processing for Instantiate_Type
12097 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
12098 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
12099 return New_List
(Error
);
12101 elsif not Is_Entity_Name
(Actual
)
12102 or else not Is_Type
(Entity
(Actual
))
12105 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
12106 Abandon_Instantiation
(Actual
);
12109 Act_T
:= Entity
(Actual
);
12111 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
12112 -- as a generic actual parameter if the corresponding formal type
12113 -- does not have a known_discriminant_part, or is a formal derived
12114 -- type that is an Unchecked_Union type.
12116 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
12117 if not Has_Discriminants
(A_Gen_T
)
12118 or else (Is_Derived_Type
(A_Gen_T
)
12119 and then Is_Unchecked_Union
(A_Gen_T
))
12123 Error_Msg_N
("unchecked union cannot be the actual for a "
12124 & "discriminated formal type", Act_T
);
12129 -- Deal with fixed/floating restrictions
12131 if Is_Floating_Point_Type
(Act_T
) then
12132 Check_Restriction
(No_Floating_Point
, Actual
);
12133 elsif Is_Fixed_Point_Type
(Act_T
) then
12134 Check_Restriction
(No_Fixed_Point
, Actual
);
12137 -- Deal with error of using incomplete type as generic actual.
12138 -- This includes limited views of a type, even if the non-limited
12139 -- view may be available.
12141 if Ekind
(Act_T
) = E_Incomplete_Type
12142 or else (Is_Class_Wide_Type
(Act_T
)
12143 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
12145 -- If the formal is an incomplete type, the actual can be
12146 -- incomplete as well.
12148 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
12151 elsif Is_Class_Wide_Type
(Act_T
)
12152 or else No
(Full_View
(Act_T
))
12154 Error_Msg_N
("premature use of incomplete type", Actual
);
12155 Abandon_Instantiation
(Actual
);
12157 Act_T
:= Full_View
(Act_T
);
12158 Set_Entity
(Actual
, Act_T
);
12160 if Has_Private_Component
(Act_T
) then
12162 ("premature use of type with private component", Actual
);
12166 -- Deal with error of premature use of private type as generic actual
12168 elsif Is_Private_Type
(Act_T
)
12169 and then Is_Private_Type
(Base_Type
(Act_T
))
12170 and then not Is_Generic_Type
(Act_T
)
12171 and then not Is_Derived_Type
(Act_T
)
12172 and then No
(Full_View
(Root_Type
(Act_T
)))
12174 -- If the formal is an incomplete type, the actual can be
12175 -- private or incomplete as well.
12177 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
12180 Error_Msg_N
("premature use of private type", Actual
);
12183 elsif Has_Private_Component
(Act_T
) then
12185 ("premature use of type with private component", Actual
);
12188 Set_Instance_Of
(A_Gen_T
, Act_T
);
12190 -- If the type is generic, the class-wide type may also be used
12192 if Is_Tagged_Type
(A_Gen_T
)
12193 and then Is_Tagged_Type
(Act_T
)
12194 and then not Is_Class_Wide_Type
(A_Gen_T
)
12196 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
12197 Class_Wide_Type
(Act_T
));
12200 if not Is_Abstract_Type
(A_Gen_T
)
12201 and then Is_Abstract_Type
(Act_T
)
12204 ("actual of non-abstract formal cannot be abstract", Actual
);
12207 -- A generic scalar type is a first subtype for which we generate
12208 -- an anonymous base type. Indicate that the instance of this base
12209 -- is the base type of the actual.
12211 if Is_Scalar_Type
(A_Gen_T
) then
12212 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
12216 if Error_Posted
(Act_T
) then
12219 case Nkind
(Def
) is
12220 when N_Formal_Private_Type_Definition
=>
12221 Validate_Private_Type_Instance
;
12223 when N_Formal_Incomplete_Type_Definition
=>
12224 Validate_Incomplete_Type_Instance
;
12226 when N_Formal_Derived_Type_Definition
=>
12227 Validate_Derived_Type_Instance
;
12229 when N_Formal_Discrete_Type_Definition
=>
12230 if not Is_Discrete_Type
(Act_T
) then
12232 ("expect discrete type in instantiation of&",
12234 Abandon_Instantiation
(Actual
);
12237 Diagnose_Predicated_Actual
;
12239 when N_Formal_Signed_Integer_Type_Definition
=>
12240 if not Is_Signed_Integer_Type
(Act_T
) then
12242 ("expect signed integer type in instantiation of&",
12244 Abandon_Instantiation
(Actual
);
12247 Diagnose_Predicated_Actual
;
12249 when N_Formal_Modular_Type_Definition
=>
12250 if not Is_Modular_Integer_Type
(Act_T
) then
12252 ("expect modular type in instantiation of &",
12254 Abandon_Instantiation
(Actual
);
12257 Diagnose_Predicated_Actual
;
12259 when N_Formal_Floating_Point_Definition
=>
12260 if not Is_Floating_Point_Type
(Act_T
) then
12262 ("expect float type in instantiation of &", Actual
, Gen_T
);
12263 Abandon_Instantiation
(Actual
);
12266 when N_Formal_Ordinary_Fixed_Point_Definition
=>
12267 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
12269 ("expect ordinary fixed point type in instantiation of &",
12271 Abandon_Instantiation
(Actual
);
12274 when N_Formal_Decimal_Fixed_Point_Definition
=>
12275 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
12277 ("expect decimal type in instantiation of &",
12279 Abandon_Instantiation
(Actual
);
12282 when N_Array_Type_Definition
=>
12283 Validate_Array_Type_Instance
;
12285 when N_Access_To_Object_Definition
=>
12286 Validate_Access_Type_Instance
;
12288 when N_Access_Function_Definition |
12289 N_Access_Procedure_Definition
=>
12290 Validate_Access_Subprogram_Instance
;
12292 when N_Record_Definition
=>
12293 Validate_Interface_Type_Instance
;
12295 when N_Derived_Type_Definition
=>
12296 Validate_Derived_Interface_Type_Instance
;
12299 raise Program_Error
;
12304 Subt
:= New_Copy
(Gen_T
);
12306 -- Use adjusted sloc of subtype name as the location for other nodes in
12307 -- the subtype declaration.
12309 Loc
:= Sloc
(Subt
);
12312 Make_Subtype_Declaration
(Loc
,
12313 Defining_Identifier
=> Subt
,
12314 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
12316 if Is_Private_Type
(Act_T
) then
12317 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
12319 elsif Is_Access_Type
(Act_T
)
12320 and then Is_Private_Type
(Designated_Type
(Act_T
))
12322 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
12325 Decl_Nodes
:= New_List
(Decl_Node
);
12327 -- Flag actual derived types so their elaboration produces the
12328 -- appropriate renamings for the primitive operations of the ancestor.
12329 -- Flag actual for formal private types as well, to determine whether
12330 -- operations in the private part may override inherited operations.
12331 -- If the formal has an interface list, the ancestor is not the
12332 -- parent, but the analyzed formal that includes the interface
12333 -- operations of all its progenitors.
12335 -- Same treatment for formal private types, so we can check whether the
12336 -- type is tagged limited when validating derivations in the private
12337 -- part. (See AI05-096).
12339 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
12340 if Present
(Interface_List
(Def
)) then
12341 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
12343 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
12346 elsif Nkind_In
(Def
,
12347 N_Formal_Private_Type_Definition
,
12348 N_Formal_Incomplete_Type_Definition
)
12350 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
12353 -- If the actual is a synchronized type that implements an interface,
12354 -- the primitive operations are attached to the corresponding record,
12355 -- and we have to treat it as an additional generic actual, so that its
12356 -- primitive operations become visible in the instance. The task or
12357 -- protected type itself does not carry primitive operations.
12359 if Is_Concurrent_Type
(Act_T
)
12360 and then Is_Tagged_Type
(Act_T
)
12361 and then Present
(Corresponding_Record_Type
(Act_T
))
12362 and then Present
(Ancestor
)
12363 and then Is_Interface
(Ancestor
)
12366 Corr_Rec
: constant Entity_Id
:=
12367 Corresponding_Record_Type
(Act_T
);
12368 New_Corr
: Entity_Id
;
12369 Corr_Decl
: Node_Id
;
12372 New_Corr
:= Make_Temporary
(Loc
, 'S');
12374 Make_Subtype_Declaration
(Loc
,
12375 Defining_Identifier
=> New_Corr
,
12376 Subtype_Indication
=>
12377 New_Occurrence_Of
(Corr_Rec
, Loc
));
12378 Append_To
(Decl_Nodes
, Corr_Decl
);
12380 if Ekind
(Act_T
) = E_Task_Type
then
12381 Set_Ekind
(Subt
, E_Task_Subtype
);
12383 Set_Ekind
(Subt
, E_Protected_Subtype
);
12386 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
12387 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
12388 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
12393 end Instantiate_Type
;
12395 ---------------------
12396 -- Is_In_Main_Unit --
12397 ---------------------
12399 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
12400 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
12401 Current_Unit
: Node_Id
;
12404 if Unum
= Main_Unit
then
12407 -- If the current unit is a subunit then it is either the main unit or
12408 -- is being compiled as part of the main unit.
12410 elsif Nkind
(N
) = N_Compilation_Unit
then
12411 return Nkind
(Unit
(N
)) = N_Subunit
;
12414 Current_Unit
:= Parent
(N
);
12415 while Present
(Current_Unit
)
12416 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
12418 Current_Unit
:= Parent
(Current_Unit
);
12421 -- The instantiation node is in the main unit, or else the current node
12422 -- (perhaps as the result of nested instantiations) is in the main unit,
12423 -- or in the declaration of the main unit, which in this last case must
12426 return Unum
= Main_Unit
12427 or else Current_Unit
= Cunit
(Main_Unit
)
12428 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
12429 or else (Present
(Library_Unit
(Current_Unit
))
12430 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
12431 end Is_In_Main_Unit
;
12433 ----------------------------
12434 -- Load_Parent_Of_Generic --
12435 ----------------------------
12437 procedure Load_Parent_Of_Generic
12440 Body_Optional
: Boolean := False)
12442 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
12443 Saved_Style_Check
: constant Boolean := Style_Check
;
12444 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
12445 True_Parent
: Node_Id
;
12446 Inst_Node
: Node_Id
;
12448 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
12450 procedure Collect_Previous_Instances
(Decls
: List_Id
);
12451 -- Collect all instantiations in the given list of declarations, that
12452 -- precede the generic that we need to load. If the bodies of these
12453 -- instantiations are available, we must analyze them, to ensure that
12454 -- the public symbols generated are the same when the unit is compiled
12455 -- to generate code, and when it is compiled in the context of a unit
12456 -- that needs a particular nested instance. This process is applied to
12457 -- both package and subprogram instances.
12459 --------------------------------
12460 -- Collect_Previous_Instances --
12461 --------------------------------
12463 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
12467 Decl
:= First
(Decls
);
12468 while Present
(Decl
) loop
12469 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
12472 -- If Decl is an instantiation, then record it as requiring
12473 -- instantiation of the corresponding body, except if it is an
12474 -- abbreviated instantiation generated internally for conformance
12475 -- checking purposes only for the case of a formal package
12476 -- declared without a box (see Instantiate_Formal_Package). Such
12477 -- an instantiation does not generate any code (the actual code
12478 -- comes from actual) and thus does not need to be analyzed here.
12479 -- If the instantiation appears with a generic package body it is
12480 -- not analyzed here either.
12482 elsif Nkind
(Decl
) = N_Package_Instantiation
12483 and then not Is_Internal
(Defining_Entity
(Decl
))
12485 Append_Elmt
(Decl
, Previous_Instances
);
12487 -- For a subprogram instantiation, omit instantiations intrinsic
12488 -- operations (Unchecked_Conversions, etc.) that have no bodies.
12490 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
12491 N_Procedure_Instantiation
)
12492 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
12494 Append_Elmt
(Decl
, Previous_Instances
);
12496 elsif Nkind
(Decl
) = N_Package_Declaration
then
12497 Collect_Previous_Instances
12498 (Visible_Declarations
(Specification
(Decl
)));
12499 Collect_Previous_Instances
12500 (Private_Declarations
(Specification
(Decl
)));
12502 -- Previous non-generic bodies may contain instances as well
12504 elsif Nkind
(Decl
) = N_Package_Body
12505 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
12507 Collect_Previous_Instances
(Declarations
(Decl
));
12509 elsif Nkind
(Decl
) = N_Subprogram_Body
12510 and then not Acts_As_Spec
(Decl
)
12511 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
12513 Collect_Previous_Instances
(Declarations
(Decl
));
12518 end Collect_Previous_Instances
;
12520 -- Start of processing for Load_Parent_Of_Generic
12523 if not In_Same_Source_Unit
(N
, Spec
)
12524 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
12525 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
12526 and then not Is_In_Main_Unit
(Spec
))
12528 -- Find body of parent of spec, and analyze it. A special case arises
12529 -- when the parent is an instantiation, that is to say when we are
12530 -- currently instantiating a nested generic. In that case, there is
12531 -- no separate file for the body of the enclosing instance. Instead,
12532 -- the enclosing body must be instantiated as if it were a pending
12533 -- instantiation, in order to produce the body for the nested generic
12534 -- we require now. Note that in that case the generic may be defined
12535 -- in a package body, the instance defined in the same package body,
12536 -- and the original enclosing body may not be in the main unit.
12538 Inst_Node
:= Empty
;
12540 True_Parent
:= Parent
(Spec
);
12541 while Present
(True_Parent
)
12542 and then Nkind
(True_Parent
) /= N_Compilation_Unit
12544 if Nkind
(True_Parent
) = N_Package_Declaration
12546 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
12548 -- Parent is a compilation unit that is an instantiation.
12549 -- Instantiation node has been replaced with package decl.
12551 Inst_Node
:= Original_Node
(True_Parent
);
12554 elsif Nkind
(True_Parent
) = N_Package_Declaration
12555 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
12556 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12558 -- Parent is an instantiation within another specification.
12559 -- Declaration for instance has been inserted before original
12560 -- instantiation node. A direct link would be preferable?
12562 Inst_Node
:= Next
(True_Parent
);
12563 while Present
(Inst_Node
)
12564 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
12569 -- If the instance appears within a generic, and the generic
12570 -- unit is defined within a formal package of the enclosing
12571 -- generic, there is no generic body available, and none
12572 -- needed. A more precise test should be used ???
12574 if No
(Inst_Node
) then
12581 True_Parent
:= Parent
(True_Parent
);
12585 -- Case where we are currently instantiating a nested generic
12587 if Present
(Inst_Node
) then
12588 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
12590 -- Instantiation node and declaration of instantiated package
12591 -- were exchanged when only the declaration was needed.
12592 -- Restore instantiation node before proceeding with body.
12594 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
12597 -- Now complete instantiation of enclosing body, if it appears in
12598 -- some other unit. If it appears in the current unit, the body
12599 -- will have been instantiated already.
12601 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12603 -- We need to determine the expander mode to instantiate the
12604 -- enclosing body. Because the generic body we need may use
12605 -- global entities declared in the enclosing package (including
12606 -- aggregates) it is in general necessary to compile this body
12607 -- with expansion enabled, except if we are within a generic
12608 -- package, in which case the usual generic rule applies.
12611 Exp_Status
: Boolean := True;
12615 -- Loop through scopes looking for generic package
12617 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
12618 while Present
(Scop
)
12619 and then Scop
/= Standard_Standard
12621 if Ekind
(Scop
) = E_Generic_Package
then
12622 Exp_Status
:= False;
12626 Scop
:= Scope
(Scop
);
12629 -- Collect previous instantiations in the unit that contains
12630 -- the desired generic.
12632 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12633 and then not Body_Optional
12637 Info
: Pending_Body_Info
;
12641 Par
:= Parent
(Inst_Node
);
12642 while Present
(Par
) loop
12643 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
12644 Par
:= Parent
(Par
);
12647 pragma Assert
(Present
(Par
));
12649 if Nkind
(Par
) = N_Package_Body
then
12650 Collect_Previous_Instances
(Declarations
(Par
));
12652 elsif Nkind
(Par
) = N_Package_Declaration
then
12653 Collect_Previous_Instances
12654 (Visible_Declarations
(Specification
(Par
)));
12655 Collect_Previous_Instances
12656 (Private_Declarations
(Specification
(Par
)));
12659 -- Enclosing unit is a subprogram body. In this
12660 -- case all instance bodies are processed in order
12661 -- and there is no need to collect them separately.
12666 Decl
:= First_Elmt
(Previous_Instances
);
12667 while Present
(Decl
) loop
12669 (Inst_Node
=> Node
(Decl
),
12671 Instance_Spec
(Node
(Decl
)),
12672 Expander_Status
=> Exp_Status
,
12673 Current_Sem_Unit
=>
12674 Get_Code_Unit
(Sloc
(Node
(Decl
))),
12675 Scope_Suppress
=> Scope_Suppress
,
12676 Local_Suppress_Stack_Top
=>
12677 Local_Suppress_Stack_Top
,
12678 Version
=> Ada_Version
,
12679 Version_Pragma
=> Ada_Version_Pragma
,
12680 Warnings
=> Save_Warnings
,
12681 SPARK_Mode
=> SPARK_Mode
,
12682 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
);
12684 -- Package instance
12687 Nkind
(Node
(Decl
)) = N_Package_Instantiation
12689 Instantiate_Package_Body
12690 (Info
, Body_Optional
=> True);
12692 -- Subprogram instance
12695 -- The instance_spec is the wrapper package,
12696 -- and the subprogram declaration is the last
12697 -- declaration in the wrapper.
12701 (Visible_Declarations
12702 (Specification
(Info
.Act_Decl
)));
12704 Instantiate_Subprogram_Body
12705 (Info
, Body_Optional
=> True);
12713 Instantiate_Package_Body
12715 ((Inst_Node
=> Inst_Node
,
12716 Act_Decl
=> True_Parent
,
12717 Expander_Status
=> Exp_Status
,
12718 Current_Sem_Unit
=> Get_Code_Unit
12719 (Sloc
(Inst_Node
)),
12720 Scope_Suppress
=> Scope_Suppress
,
12721 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
12722 Version
=> Ada_Version
,
12723 Version_Pragma
=> Ada_Version_Pragma
,
12724 Warnings
=> Save_Warnings
,
12725 SPARK_Mode
=> SPARK_Mode
,
12726 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
12727 Body_Optional
=> Body_Optional
);
12731 -- Case where we are not instantiating a nested generic
12734 Opt
.Style_Check
:= False;
12735 Expander_Mode_Save_And_Set
(True);
12736 Load_Needed_Body
(Comp_Unit
, OK
);
12737 Opt
.Style_Check
:= Saved_Style_Check
;
12738 Restore_Warnings
(Saved_Warnings
);
12739 Expander_Mode_Restore
;
12742 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
12743 and then not Body_Optional
12746 Bname
: constant Unit_Name_Type
:=
12747 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
12750 -- In CodePeer mode, the missing body may make the analysis
12751 -- incomplete, but we do not treat it as fatal.
12753 if CodePeer_Mode
then
12757 Error_Msg_Unit_1
:= Bname
;
12758 Error_Msg_N
("this instantiation requires$!", N
);
12759 Error_Msg_File_1
:=
12760 Get_File_Name
(Bname
, Subunit
=> False);
12761 Error_Msg_N
("\but file{ was not found!", N
);
12762 raise Unrecoverable_Error
;
12769 -- If loading parent of the generic caused an instantiation circularity,
12770 -- we abandon compilation at this point, because otherwise in some cases
12771 -- we get into trouble with infinite recursions after this point.
12773 if Circularity_Detected
then
12774 raise Unrecoverable_Error
;
12776 end Load_Parent_Of_Generic
;
12778 ---------------------------------
12779 -- Map_Formal_Package_Entities --
12780 ---------------------------------
12782 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
12787 Set_Instance_Of
(Form
, Act
);
12789 -- Traverse formal and actual package to map the corresponding entities.
12790 -- We skip over internal entities that may be generated during semantic
12791 -- analysis, and find the matching entities by name, given that they
12792 -- must appear in the same order.
12794 E1
:= First_Entity
(Form
);
12795 E2
:= First_Entity
(Act
);
12796 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
12797 -- Could this test be a single condition??? Seems like it could, and
12798 -- isn't FPE (Form) a constant anyway???
12800 if not Is_Internal
(E1
)
12801 and then Present
(Parent
(E1
))
12802 and then not Is_Class_Wide_Type
(E1
)
12803 and then not Is_Internal_Name
(Chars
(E1
))
12805 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
12812 Set_Instance_Of
(E1
, E2
);
12814 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
12815 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
12818 if Is_Constrained
(E1
) then
12819 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
12822 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
12823 Map_Formal_Package_Entities
(E1
, E2
);
12830 end Map_Formal_Package_Entities
;
12832 -----------------------
12833 -- Move_Freeze_Nodes --
12834 -----------------------
12836 procedure Move_Freeze_Nodes
12837 (Out_Of
: Entity_Id
;
12842 Next_Decl
: Node_Id
;
12843 Next_Node
: Node_Id
:= After
;
12846 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
12847 -- Check whether entity is declared in a scope external to that of the
12850 -------------------
12851 -- Is_Outer_Type --
12852 -------------------
12854 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
12855 Scop
: Entity_Id
:= Scope
(T
);
12858 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
12862 while Scop
/= Standard_Standard
loop
12863 if Scop
= Out_Of
then
12866 Scop
:= Scope
(Scop
);
12874 -- Start of processing for Move_Freeze_Nodes
12881 -- First remove the freeze nodes that may appear before all other
12885 while Present
(Decl
)
12886 and then Nkind
(Decl
) = N_Freeze_Entity
12887 and then Is_Outer_Type
(Entity
(Decl
))
12889 Decl
:= Remove_Head
(L
);
12890 Insert_After
(Next_Node
, Decl
);
12891 Set_Analyzed
(Decl
, False);
12896 -- Next scan the list of declarations and remove each freeze node that
12897 -- appears ahead of the current node.
12899 while Present
(Decl
) loop
12900 while Present
(Next
(Decl
))
12901 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
12902 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
12904 Next_Decl
:= Remove_Next
(Decl
);
12905 Insert_After
(Next_Node
, Next_Decl
);
12906 Set_Analyzed
(Next_Decl
, False);
12907 Next_Node
:= Next_Decl
;
12910 -- If the declaration is a nested package or concurrent type, then
12911 -- recurse. Nested generic packages will have been processed from the
12914 case Nkind
(Decl
) is
12915 when N_Package_Declaration
=>
12916 Spec
:= Specification
(Decl
);
12918 when N_Task_Type_Declaration
=>
12919 Spec
:= Task_Definition
(Decl
);
12921 when N_Protected_Type_Declaration
=>
12922 Spec
:= Protected_Definition
(Decl
);
12928 if Present
(Spec
) then
12929 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
12930 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
12935 end Move_Freeze_Nodes
;
12941 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
12943 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
12946 ------------------------
12947 -- Preanalyze_Actuals --
12948 ------------------------
12950 procedure Preanalyze_Actuals
(N
: Node_Id
) is
12953 Errs
: constant Int
:= Serious_Errors_Detected
;
12955 Cur
: Entity_Id
:= Empty
;
12956 -- Current homograph of the instance name
12959 -- Saved visibility status of the current homograph
12962 Assoc
:= First
(Generic_Associations
(N
));
12964 -- If the instance is a child unit, its name may hide an outer homonym,
12965 -- so make it invisible to perform name resolution on the actuals.
12967 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
12969 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
12971 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
12973 if Is_Compilation_Unit
(Cur
) then
12974 Vis
:= Is_Immediately_Visible
(Cur
);
12975 Set_Is_Immediately_Visible
(Cur
, False);
12981 while Present
(Assoc
) loop
12982 if Nkind
(Assoc
) /= N_Others_Choice
then
12983 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
12985 -- Within a nested instantiation, a defaulted actual is an empty
12986 -- association, so nothing to analyze. If the subprogram actual
12987 -- is an attribute, analyze prefix only, because actual is not a
12988 -- complete attribute reference.
12990 -- If actual is an allocator, analyze expression only. The full
12991 -- analysis can generate code, and if instance is a compilation
12992 -- unit we have to wait until the package instance is installed
12993 -- to have a proper place to insert this code.
12995 -- String literals may be operators, but at this point we do not
12996 -- know whether the actual is a formal subprogram or a string.
13001 elsif Nkind
(Act
) = N_Attribute_Reference
then
13002 Analyze
(Prefix
(Act
));
13004 elsif Nkind
(Act
) = N_Explicit_Dereference
then
13005 Analyze
(Prefix
(Act
));
13007 elsif Nkind
(Act
) = N_Allocator
then
13009 Expr
: constant Node_Id
:= Expression
(Act
);
13012 if Nkind
(Expr
) = N_Subtype_Indication
then
13013 Analyze
(Subtype_Mark
(Expr
));
13015 -- Analyze separately each discriminant constraint, when
13016 -- given with a named association.
13022 Constr
:= First
(Constraints
(Constraint
(Expr
)));
13023 while Present
(Constr
) loop
13024 if Nkind
(Constr
) = N_Discriminant_Association
then
13025 Analyze
(Expression
(Constr
));
13039 elsif Nkind
(Act
) /= N_Operator_Symbol
then
13043 -- Ensure that a ghost subprogram does not act as generic actual
13045 if Is_Entity_Name
(Act
)
13046 and then Is_Ghost_Subprogram
(Entity
(Act
))
13049 ("ghost subprogram & cannot act as generic actual", Act
);
13050 Abandon_Instantiation
(Act
);
13052 elsif Errs
/= Serious_Errors_Detected
then
13054 -- Do a minimal analysis of the generic, to prevent spurious
13055 -- warnings complaining about the generic being unreferenced,
13056 -- before abandoning the instantiation.
13058 Analyze
(Name
(N
));
13060 if Is_Entity_Name
(Name
(N
))
13061 and then Etype
(Name
(N
)) /= Any_Type
13063 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
13064 Set_Is_Instantiated
(Entity
(Name
(N
)));
13067 if Present
(Cur
) then
13069 -- For the case of a child instance hiding an outer homonym,
13070 -- provide additional warning which might explain the error.
13072 Set_Is_Immediately_Visible
(Cur
, Vis
);
13073 Error_Msg_NE
("& hides outer unit with the same name??",
13074 N
, Defining_Unit_Name
(N
));
13077 Abandon_Instantiation
(Act
);
13084 if Present
(Cur
) then
13085 Set_Is_Immediately_Visible
(Cur
, Vis
);
13087 end Preanalyze_Actuals
;
13089 -------------------
13090 -- Remove_Parent --
13091 -------------------
13093 procedure Remove_Parent
(In_Body
: Boolean := False) is
13094 S
: Entity_Id
:= Current_Scope
;
13095 -- S is the scope containing the instantiation just completed. The scope
13096 -- stack contains the parent instances of the instantiation, followed by
13105 -- After child instantiation is complete, remove from scope stack the
13106 -- extra copy of the current scope, and then remove parent instances.
13108 if not In_Body
then
13111 while Current_Scope
/= S
loop
13112 P
:= Current_Scope
;
13113 End_Package_Scope
(Current_Scope
);
13115 if In_Open_Scopes
(P
) then
13116 E
:= First_Entity
(P
);
13117 while Present
(E
) loop
13118 Set_Is_Immediately_Visible
(E
, True);
13122 -- If instantiation is declared in a block, it is the enclosing
13123 -- scope that might be a parent instance. Note that only one
13124 -- block can be involved, because the parent instances have
13125 -- been installed within it.
13127 if Ekind
(P
) = E_Block
then
13128 Cur_P
:= Scope
(P
);
13133 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
13134 -- We are within an instance of some sibling. Retain
13135 -- visibility of parent, for proper subsequent cleanup, and
13136 -- reinstall private declarations as well.
13138 Set_In_Private_Part
(P
);
13139 Install_Private_Declarations
(P
);
13142 -- If the ultimate parent is a top-level unit recorded in
13143 -- Instance_Parent_Unit, then reset its visibility to what it was
13144 -- before instantiation. (It's not clear what the purpose is of
13145 -- testing whether Scope (P) is In_Open_Scopes, but that test was
13146 -- present before the ultimate parent test was added.???)
13148 elsif not In_Open_Scopes
(Scope
(P
))
13149 or else (P
= Instance_Parent_Unit
13150 and then not Parent_Unit_Visible
)
13152 Set_Is_Immediately_Visible
(P
, False);
13154 -- If the current scope is itself an instantiation of a generic
13155 -- nested within P, and we are in the private part of body of this
13156 -- instantiation, restore the full views of P, that were removed
13157 -- in End_Package_Scope above. This obscure case can occur when a
13158 -- subunit of a generic contains an instance of a child unit of
13159 -- its generic parent unit.
13161 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
13163 Par
: constant Entity_Id
:=
13164 Generic_Parent
(Package_Specification
(S
));
13167 and then P
= Scope
(Par
)
13168 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
13170 Set_In_Private_Part
(P
);
13171 Install_Private_Declarations
(P
);
13177 -- Reset visibility of entities in the enclosing scope
13179 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
13181 Hidden
:= First_Elmt
(Hidden_Entities
);
13182 while Present
(Hidden
) loop
13183 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
13184 Next_Elmt
(Hidden
);
13188 -- Each body is analyzed separately, and there is no context that
13189 -- needs preserving from one body instance to the next, so remove all
13190 -- parent scopes that have been installed.
13192 while Present
(S
) loop
13193 End_Package_Scope
(S
);
13194 Set_Is_Immediately_Visible
(S
, False);
13195 S
:= Current_Scope
;
13196 exit when S
= Standard_Standard
;
13205 procedure Restore_Env
is
13206 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
13209 if No
(Current_Instantiated_Parent
.Act_Id
) then
13210 -- Restore environment after subprogram inlining
13212 Restore_Private_Views
(Empty
);
13215 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
13216 Exchanged_Views
:= Saved
.Exchanged_Views
;
13217 Hidden_Entities
:= Saved
.Hidden_Entities
;
13218 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
13219 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
13220 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
13222 Restore_Opt_Config_Switches
(Saved
.Switches
);
13224 Instance_Envs
.Decrement_Last
;
13227 ---------------------------
13228 -- Restore_Private_Views --
13229 ---------------------------
13231 procedure Restore_Private_Views
13232 (Pack_Id
: Entity_Id
;
13233 Is_Package
: Boolean := True)
13238 Dep_Elmt
: Elmt_Id
;
13241 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
13242 -- Hide the generic formals of formal packages declared with box which
13243 -- were reachable in the current instantiation.
13245 ---------------------------
13246 -- Restore_Nested_Formal --
13247 ---------------------------
13249 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
13253 if Present
(Renamed_Object
(Formal
))
13254 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
13258 elsif Present
(Associated_Formal_Package
(Formal
)) then
13259 Ent
:= First_Entity
(Formal
);
13260 while Present
(Ent
) loop
13261 exit when Ekind
(Ent
) = E_Package
13262 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
13264 Set_Is_Hidden
(Ent
);
13265 Set_Is_Potentially_Use_Visible
(Ent
, False);
13267 -- If package, then recurse
13269 if Ekind
(Ent
) = E_Package
then
13270 Restore_Nested_Formal
(Ent
);
13276 end Restore_Nested_Formal
;
13278 -- Start of processing for Restore_Private_Views
13281 M
:= First_Elmt
(Exchanged_Views
);
13282 while Present
(M
) loop
13285 -- Subtypes of types whose views have been exchanged, and that are
13286 -- defined within the instance, were not on the Private_Dependents
13287 -- list on entry to the instance, so they have to be exchanged
13288 -- explicitly now, in order to remain consistent with the view of the
13291 if Ekind_In
(Typ
, E_Private_Type
,
13292 E_Limited_Private_Type
,
13293 E_Record_Type_With_Private
)
13295 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
13296 while Present
(Dep_Elmt
) loop
13297 Dep_Typ
:= Node
(Dep_Elmt
);
13299 if Scope
(Dep_Typ
) = Pack_Id
13300 and then Present
(Full_View
(Dep_Typ
))
13302 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
13303 Exchange_Declarations
(Dep_Typ
);
13306 Next_Elmt
(Dep_Elmt
);
13310 Exchange_Declarations
(Node
(M
));
13314 if No
(Pack_Id
) then
13318 -- Make the generic formal parameters private, and make the formal types
13319 -- into subtypes of the actuals again.
13321 E
:= First_Entity
(Pack_Id
);
13322 while Present
(E
) loop
13323 Set_Is_Hidden
(E
, True);
13326 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
13328 -- If the actual for E is itself a generic actual type from
13329 -- an enclosing instance, E is still a generic actual type
13330 -- outside of the current instance. This matter when resolving
13331 -- an overloaded call that may be ambiguous in the enclosing
13332 -- instance, when two of its actuals coincide.
13334 if Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
13335 and then Is_Generic_Actual_Type
13336 (Entity
(Subtype_Indication
(Parent
(E
))))
13340 Set_Is_Generic_Actual_Type
(E
, False);
13343 -- An unusual case of aliasing: the actual may also be directly
13344 -- visible in the generic, and be private there, while it is fully
13345 -- visible in the context of the instance. The internal subtype
13346 -- is private in the instance but has full visibility like its
13347 -- parent in the enclosing scope. This enforces the invariant that
13348 -- the privacy status of all private dependents of a type coincide
13349 -- with that of the parent type. This can only happen when a
13350 -- generic child unit is instantiated within a sibling.
13352 if Is_Private_Type
(E
)
13353 and then not Is_Private_Type
(Etype
(E
))
13355 Exchange_Declarations
(E
);
13358 elsif Ekind
(E
) = E_Package
then
13360 -- The end of the renaming list is the renaming of the generic
13361 -- package itself. If the instance is a subprogram, all entities
13362 -- in the corresponding package are renamings. If this entity is
13363 -- a formal package, make its own formals private as well. The
13364 -- actual in this case is itself the renaming of an instantiation.
13365 -- If the entity is not a package renaming, it is the entity
13366 -- created to validate formal package actuals: ignore it.
13368 -- If the actual is itself a formal package for the enclosing
13369 -- generic, or the actual for such a formal package, it remains
13370 -- visible on exit from the instance, and therefore nothing needs
13371 -- to be done either, except to keep it accessible.
13373 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
13376 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
13380 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
13382 Set_Is_Hidden
(E
, False);
13386 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
13390 Id
:= First_Entity
(Act_P
);
13392 and then Id
/= First_Private_Entity
(Act_P
)
13394 exit when Ekind
(Id
) = E_Package
13395 and then Renamed_Object
(Id
) = Act_P
;
13397 Set_Is_Hidden
(Id
, True);
13398 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
13400 if Ekind
(Id
) = E_Package
then
13401 Restore_Nested_Formal
(Id
);
13412 end Restore_Private_Views
;
13419 (Gen_Unit
: Entity_Id
;
13420 Act_Unit
: Entity_Id
)
13424 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
13427 ----------------------------
13428 -- Save_Global_References --
13429 ----------------------------
13431 procedure Save_Global_References
(N
: Node_Id
) is
13432 Gen_Scope
: Entity_Id
;
13436 function Is_Global
(E
: Entity_Id
) return Boolean;
13437 -- Check whether entity is defined outside of generic unit. Examine the
13438 -- scope of an entity, and the scope of the scope, etc, until we find
13439 -- either Standard, in which case the entity is global, or the generic
13440 -- unit itself, which indicates that the entity is local. If the entity
13441 -- is the generic unit itself, as in the case of a recursive call, or
13442 -- the enclosing generic unit, if different from the current scope, then
13443 -- it is local as well, because it will be replaced at the point of
13444 -- instantiation. On the other hand, if it is a reference to a child
13445 -- unit of a common ancestor, which appears in an instantiation, it is
13446 -- global because it is used to denote a specific compilation unit at
13447 -- the time the instantiations will be analyzed.
13449 procedure Reset_Entity
(N
: Node_Id
);
13450 -- Save semantic information on global entity so that it is not resolved
13451 -- again at instantiation time.
13453 procedure Save_Entity_Descendants
(N
: Node_Id
);
13454 -- Apply Save_Global_References to the two syntactic descendants of
13455 -- non-terminal nodes that carry an Associated_Node and are processed
13456 -- through Reset_Entity. Once the global entity (if any) has been
13457 -- captured together with its type, only two syntactic descendants need
13458 -- to be traversed to complete the processing of the tree rooted at N.
13459 -- This applies to Selected_Components, Expanded_Names, and to Operator
13460 -- nodes. N can also be a character literal, identifier, or operator
13461 -- symbol node, but the call has no effect in these cases.
13463 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
13464 -- Default actuals in nested instances must be handled specially
13465 -- because there is no link to them from the original tree. When an
13466 -- actual subprogram is given by a default, we add an explicit generic
13467 -- association for it in the instantiation node. When we save the
13468 -- global references on the name of the instance, we recover the list
13469 -- of generic associations, and add an explicit one to the original
13470 -- generic tree, through which a global actual can be preserved.
13471 -- Similarly, if a child unit is instantiated within a sibling, in the
13472 -- context of the parent, we must preserve the identifier of the parent
13473 -- so that it can be properly resolved in a subsequent instantiation.
13475 procedure Save_Global_Descendant
(D
: Union_Id
);
13476 -- Apply Save_Global_References recursively to the descendents of the
13479 procedure Save_References
(N
: Node_Id
);
13480 -- This is the recursive procedure that does the work, once the
13481 -- enclosing generic scope has been established.
13487 function Is_Global
(E
: Entity_Id
) return Boolean is
13490 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
13491 -- Determine whether the parent node of a reference to a child unit
13492 -- denotes an instantiation or a formal package, in which case the
13493 -- reference to the child unit is global, even if it appears within
13494 -- the current scope (e.g. when the instance appears within the body
13495 -- of an ancestor).
13497 ----------------------
13498 -- Is_Instance_Node --
13499 ----------------------
13501 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
13503 return Nkind
(Decl
) in N_Generic_Instantiation
13505 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
13506 end Is_Instance_Node
;
13508 -- Start of processing for Is_Global
13511 if E
= Gen_Scope
then
13514 elsif E
= Standard_Standard
then
13517 elsif Is_Child_Unit
(E
)
13518 and then (Is_Instance_Node
(Parent
(N2
))
13519 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
13520 and then N2
= Selector_Name
(Parent
(N2
))
13522 Is_Instance_Node
(Parent
(Parent
(N2
)))))
13528 while Se
/= Gen_Scope
loop
13529 if Se
= Standard_Standard
then
13544 procedure Reset_Entity
(N
: Node_Id
) is
13546 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
13547 -- If the type of N2 is global to the generic unit, save the type in
13548 -- the generic node. Just as we perform name capture for explicit
13549 -- references within the generic, we must capture the global types
13550 -- of local entities because they may participate in resolution in
13553 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
13554 -- Find the ultimate ancestor of the current unit. If it is not a
13555 -- generic unit, then the name of the current unit in the prefix of
13556 -- an expanded name must be replaced with its generic homonym to
13557 -- ensure that it will be properly resolved in an instance.
13559 ---------------------
13560 -- Set_Global_Type --
13561 ---------------------
13563 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
13564 Typ
: constant Entity_Id
:= Etype
(N2
);
13567 Set_Etype
(N
, Typ
);
13569 if Entity
(N
) /= N2
13570 and then Has_Private_View
(Entity
(N
))
13572 -- If the entity of N is not the associated node, this is a
13573 -- nested generic and it has an associated node as well, whose
13574 -- type is already the full view (see below). Indicate that the
13575 -- original node has a private view.
13577 Set_Has_Private_View
(N
);
13580 -- If not a private type, nothing else to do
13582 if not Is_Private_Type
(Typ
) then
13583 if Is_Array_Type
(Typ
)
13584 and then Is_Private_Type
(Component_Type
(Typ
))
13586 Set_Has_Private_View
(N
);
13589 -- If it is a derivation of a private type in a context where no
13590 -- full view is needed, nothing to do either.
13592 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
13595 -- Otherwise mark the type for flipping and use the full view when
13599 Set_Has_Private_View
(N
);
13601 if Present
(Full_View
(Typ
)) then
13602 Set_Etype
(N2
, Full_View
(Typ
));
13605 end Set_Global_Type
;
13611 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
13616 while Is_Child_Unit
(Par
) loop
13617 Par
:= Scope
(Par
);
13623 -- Start of processing for Reset_Entity
13626 N2
:= Get_Associated_Node
(N
);
13629 if Present
(E
) then
13631 -- If the node is an entry call to an entry in an enclosing task,
13632 -- it is rewritten as a selected component. No global entity to
13633 -- preserve in this case, since the expansion will be redone in
13636 if not Nkind_In
(E
, N_Defining_Identifier
,
13637 N_Defining_Character_Literal
,
13638 N_Defining_Operator_Symbol
)
13640 Set_Associated_Node
(N
, Empty
);
13641 Set_Etype
(N
, Empty
);
13645 -- If the entity is an itype created as a subtype of an access
13646 -- type with a null exclusion restore source entity for proper
13647 -- visibility. The itype will be created anew in the instance.
13650 and then Ekind
(E
) = E_Access_Subtype
13651 and then Is_Entity_Name
(N
)
13652 and then Chars
(Etype
(E
)) = Chars
(N
)
13655 Set_Entity
(N2
, E
);
13659 if Is_Global
(E
) then
13661 -- If the entity is a package renaming that is the prefix of
13662 -- an expanded name, it has been rewritten as the renamed
13663 -- package, which is necessary semantically but complicates
13664 -- ASIS tree traversal, so we recover the original entity to
13665 -- expose the renaming. Take into account that the context may
13666 -- be a nested generic, that the original node may itself have
13667 -- an associated node that had better be an entity, and that
13668 -- the current node is still a selected component.
13670 if Ekind
(E
) = E_Package
13671 and then Nkind
(N
) = N_Selected_Component
13672 and then Nkind
(Parent
(N
)) = N_Expanded_Name
13673 and then Present
(Original_Node
(N2
))
13674 and then Is_Entity_Name
(Original_Node
(N2
))
13675 and then Present
(Entity
(Original_Node
(N2
)))
13677 if Is_Global
(Entity
(Original_Node
(N2
))) then
13678 N2
:= Original_Node
(N2
);
13679 Set_Associated_Node
(N
, N2
);
13680 Set_Global_Type
(N
, N2
);
13683 -- Renaming is local, and will be resolved in instance
13685 Set_Associated_Node
(N
, Empty
);
13686 Set_Etype
(N
, Empty
);
13690 Set_Global_Type
(N
, N2
);
13693 elsif Nkind
(N
) = N_Op_Concat
13694 and then Is_Generic_Type
(Etype
(N2
))
13695 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
13697 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
13698 and then Is_Intrinsic_Subprogram
(E
)
13703 -- Entity is local. Mark generic node as unresolved.
13704 -- Note that now it does not have an entity.
13706 Set_Associated_Node
(N
, Empty
);
13707 Set_Etype
(N
, Empty
);
13710 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
13711 and then N
= Name
(Parent
(N
))
13713 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
13716 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13717 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
13719 if Is_Global
(Entity
(Parent
(N2
))) then
13720 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13721 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
13722 Set_Global_Type
(Parent
(N
), Parent
(N2
));
13723 Save_Entity_Descendants
(N
);
13725 -- If this is a reference to the current generic entity, replace
13726 -- by the name of the generic homonym of the current package. This
13727 -- is because in an instantiation Par.P.Q will not resolve to the
13728 -- name of the instance, whose enclosing scope is not necessarily
13729 -- Par. We use the generic homonym rather that the name of the
13730 -- generic itself because it may be hidden by a local declaration.
13732 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
13734 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
13736 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
13737 Rewrite
(Parent
(N
),
13738 Make_Identifier
(Sloc
(N
),
13740 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
13742 Rewrite
(Parent
(N
),
13743 Make_Identifier
(Sloc
(N
),
13744 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
13748 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
13749 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
13751 Save_Global_Defaults
13752 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
13755 -- A selected component may denote a static constant that has been
13756 -- folded. If the static constant is global to the generic, capture
13757 -- its value. Otherwise the folding will happen in any instantiation.
13759 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13760 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
13762 if Present
(Entity
(Original_Node
(Parent
(N2
))))
13763 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
13765 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
13766 Set_Analyzed
(Parent
(N
), False);
13772 -- A selected component may be transformed into a parameterless
13773 -- function call. If the called entity is global, rewrite the node
13774 -- appropriately, i.e. as an extended name for the global entity.
13776 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13777 and then Nkind
(Parent
(N2
)) = N_Function_Call
13778 and then N
= Selector_Name
(Parent
(N
))
13780 if No
(Parameter_Associations
(Parent
(N2
))) then
13781 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
13782 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13783 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
13784 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
13785 Save_Entity_Descendants
(N
);
13788 Set_Is_Prefixed_Call
(Parent
(N
));
13789 Set_Associated_Node
(N
, Empty
);
13790 Set_Etype
(N
, Empty
);
13793 -- In Ada 2005, X.F may be a call to a primitive operation,
13794 -- rewritten as F (X). This rewriting will be done again in an
13795 -- instance, so keep the original node. Global entities will be
13796 -- captured as for other constructs. Indicate that this must
13797 -- resolve as a call, to prevent accidental overloading in the
13798 -- instance, if both a component and a primitive operation appear
13802 Set_Is_Prefixed_Call
(Parent
(N
));
13805 -- Entity is local. Reset in generic unit, so that node is resolved
13806 -- anew at the point of instantiation.
13809 Set_Associated_Node
(N
, Empty
);
13810 Set_Etype
(N
, Empty
);
13814 -----------------------------
13815 -- Save_Entity_Descendants --
13816 -----------------------------
13818 procedure Save_Entity_Descendants
(N
: Node_Id
) is
13821 when N_Binary_Op
=>
13822 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
13823 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13826 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13828 when N_Expanded_Name | N_Selected_Component
=>
13829 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
13830 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
13832 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
13836 raise Program_Error
;
13838 end Save_Entity_Descendants
;
13840 --------------------------
13841 -- Save_Global_Defaults --
13842 --------------------------
13844 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
13845 Loc
: constant Source_Ptr
:= Sloc
(N1
);
13846 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
13847 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
13854 Actual
: Entity_Id
;
13857 Assoc1
:= Generic_Associations
(N1
);
13859 if Present
(Assoc1
) then
13860 Act1
:= First
(Assoc1
);
13863 Set_Generic_Associations
(N1
, New_List
);
13864 Assoc1
:= Generic_Associations
(N1
);
13867 if Present
(Assoc2
) then
13868 Act2
:= First
(Assoc2
);
13873 while Present
(Act1
) and then Present
(Act2
) loop
13878 -- Find the associations added for default subprograms
13880 if Present
(Act2
) then
13881 while Nkind
(Act2
) /= N_Generic_Association
13882 or else No
(Entity
(Selector_Name
(Act2
)))
13883 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
13888 -- Add a similar association if the default is global. The
13889 -- renaming declaration for the actual has been analyzed, and
13890 -- its alias is the program it renames. Link the actual in the
13891 -- original generic tree with the node in the analyzed tree.
13893 while Present
(Act2
) loop
13894 Subp
:= Entity
(Selector_Name
(Act2
));
13895 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
13897 -- Following test is defence against rubbish errors
13899 if No
(Alias
(Subp
)) then
13903 -- Retrieve the resolved actual from the renaming declaration
13904 -- created for the instantiated formal.
13906 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
13907 Set_Entity
(Def
, Actual
);
13908 Set_Etype
(Def
, Etype
(Actual
));
13910 if Is_Global
(Actual
) then
13912 Make_Generic_Association
(Loc
,
13913 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13914 Explicit_Generic_Actual_Parameter
=>
13915 New_Occurrence_Of
(Actual
, Loc
));
13917 Set_Associated_Node
13918 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
13920 Append
(Ndec
, Assoc1
);
13922 -- If there are other defaults, add a dummy association in case
13923 -- there are other defaulted formals with the same name.
13925 elsif Present
(Next
(Act2
)) then
13927 Make_Generic_Association
(Loc
,
13928 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13929 Explicit_Generic_Actual_Parameter
=> Empty
);
13931 Append
(Ndec
, Assoc1
);
13938 if Nkind
(Name
(N1
)) = N_Identifier
13939 and then Is_Child_Unit
(Gen_Id
)
13940 and then Is_Global
(Gen_Id
)
13941 and then Is_Generic_Unit
(Scope
(Gen_Id
))
13942 and then In_Open_Scopes
(Scope
(Gen_Id
))
13944 -- This is an instantiation of a child unit within a sibling, so
13945 -- that the generic parent is in scope. An eventual instance must
13946 -- occur within the scope of an instance of the parent. Make name
13947 -- in instance into an expanded name, to preserve the identifier
13948 -- of the parent, so it can be resolved subsequently.
13950 Rewrite
(Name
(N2
),
13951 Make_Expanded_Name
(Loc
,
13952 Chars
=> Chars
(Gen_Id
),
13953 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13954 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13955 Set_Entity
(Name
(N2
), Gen_Id
);
13957 Rewrite
(Name
(N1
),
13958 Make_Expanded_Name
(Loc
,
13959 Chars
=> Chars
(Gen_Id
),
13960 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13961 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13963 Set_Associated_Node
(Name
(N1
), Name
(N2
));
13964 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
13965 Set_Associated_Node
13966 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
13967 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
13970 end Save_Global_Defaults
;
13972 ----------------------------
13973 -- Save_Global_Descendant --
13974 ----------------------------
13976 procedure Save_Global_Descendant
(D
: Union_Id
) is
13980 if D
in Node_Range
then
13981 if D
= Union_Id
(Empty
) then
13984 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
13985 Save_References
(Node_Id
(D
));
13988 elsif D
in List_Range
then
13989 if D
= Union_Id
(No_List
) or else Is_Empty_List
(List_Id
(D
)) then
13993 N1
:= First
(List_Id
(D
));
13994 while Present
(N1
) loop
13995 Save_References
(N1
);
14000 -- Element list or other non-node field, nothing to do
14005 end Save_Global_Descendant
;
14007 ---------------------
14008 -- Save_References --
14009 ---------------------
14011 -- This is the recursive procedure that does the work once the enclosing
14012 -- generic scope has been established. We have to treat specially a
14013 -- number of node rewritings that are required by semantic processing
14014 -- and which change the kind of nodes in the generic copy: typically
14015 -- constant-folding, replacing an operator node by a string literal, or
14016 -- a selected component by an expanded name. In each of those cases, the
14017 -- transformation is propagated to the generic unit.
14019 procedure Save_References
(N
: Node_Id
) is
14020 Loc
: constant Source_Ptr
:= Sloc
(N
);
14026 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
14027 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14030 elsif Nkind
(N
) = N_Operator_Symbol
14031 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
14033 Change_Operator_Symbol_To_String_Literal
(N
);
14036 elsif Nkind
(N
) in N_Op
then
14037 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14038 if Nkind
(N
) = N_Op_Concat
then
14039 Set_Is_Component_Left_Opnd
(N
,
14040 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
14042 Set_Is_Component_Right_Opnd
(N
,
14043 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
14049 -- Node may be transformed into call to a user-defined operator
14051 N2
:= Get_Associated_Node
(N
);
14053 if Nkind
(N2
) = N_Function_Call
then
14054 E
:= Entity
(Name
(N2
));
14057 and then Is_Global
(E
)
14059 Set_Etype
(N
, Etype
(N2
));
14061 Set_Associated_Node
(N
, Empty
);
14062 Set_Etype
(N
, Empty
);
14065 elsif Nkind_In
(N2
, N_Integer_Literal
,
14069 if Present
(Original_Node
(N2
))
14070 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
14073 -- Operation was constant-folded. Whenever possible,
14074 -- recover semantic information from unfolded node,
14077 Set_Associated_Node
(N
, Original_Node
(N2
));
14079 if Nkind
(N
) = N_Op_Concat
then
14080 Set_Is_Component_Left_Opnd
(N
,
14081 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
14082 Set_Is_Component_Right_Opnd
(N
,
14083 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
14089 -- If original node is already modified, propagate
14090 -- constant-folding to template.
14092 Rewrite
(N
, New_Copy
(N2
));
14093 Set_Analyzed
(N
, False);
14096 elsif Nkind
(N2
) = N_Identifier
14097 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
14099 -- Same if call was folded into a literal, but in this case
14100 -- retain the entity to avoid spurious ambiguities if it is
14101 -- overloaded at the point of instantiation or inlining.
14103 Rewrite
(N
, New_Copy
(N2
));
14104 Set_Analyzed
(N
, False);
14108 -- Complete operands check if node has not been constant-folded
14110 if Nkind
(N
) in N_Op
then
14111 Save_Entity_Descendants
(N
);
14114 elsif Nkind
(N
) = N_Identifier
then
14115 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14117 -- If this is a discriminant reference, always save it. It is
14118 -- used in the instance to find the corresponding discriminant
14119 -- positionally rather than by name.
14121 Set_Original_Discriminant
14122 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
14126 N2
:= Get_Associated_Node
(N
);
14128 if Nkind
(N2
) = N_Function_Call
then
14129 E
:= Entity
(Name
(N2
));
14131 -- Name resolves to a call to parameterless function. If
14132 -- original entity is global, mark node as resolved.
14135 and then Is_Global
(E
)
14137 Set_Etype
(N
, Etype
(N2
));
14139 Set_Associated_Node
(N
, Empty
);
14140 Set_Etype
(N
, Empty
);
14143 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
14144 and then Is_Entity_Name
(Original_Node
(N2
))
14146 -- Name resolves to named number that is constant-folded,
14147 -- We must preserve the original name for ASIS use, and
14148 -- undo the constant-folding, which will be repeated in
14151 Set_Associated_Node
(N
, Original_Node
(N2
));
14154 elsif Nkind
(N2
) = N_String_Literal
then
14156 -- Name resolves to string literal. Perform the same
14157 -- replacement in generic.
14159 Rewrite
(N
, New_Copy
(N2
));
14161 elsif Nkind
(N2
) = N_Explicit_Dereference
then
14163 -- An identifier is rewritten as a dereference if it is the
14164 -- prefix in an implicit dereference (call or attribute).
14165 -- The analysis of an instantiation will expand the node
14166 -- again, so we preserve the original tree but link it to
14167 -- the resolved entity in case it is global.
14169 if Is_Entity_Name
(Prefix
(N2
))
14170 and then Present
(Entity
(Prefix
(N2
)))
14171 and then Is_Global
(Entity
(Prefix
(N2
)))
14173 Set_Associated_Node
(N
, Prefix
(N2
));
14175 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
14176 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
14179 Make_Explicit_Dereference
(Loc
,
14180 Prefix
=> Make_Function_Call
(Loc
,
14182 New_Occurrence_Of
(Entity
(Name
(Prefix
(N2
))),
14186 Set_Associated_Node
(N
, Empty
);
14187 Set_Etype
(N
, Empty
);
14190 -- The subtype mark of a nominally unconstrained object is
14191 -- rewritten as a subtype indication using the bounds of the
14192 -- expression. Recover the original subtype mark.
14194 elsif Nkind
(N2
) = N_Subtype_Indication
14195 and then Is_Entity_Name
(Original_Node
(N2
))
14197 Set_Associated_Node
(N
, Original_Node
(N2
));
14205 elsif Nkind
(N
) in N_Entity
then
14210 Qual
: Node_Id
:= Empty
;
14211 Typ
: Entity_Id
:= Empty
;
14214 use Atree
.Unchecked_Access
;
14215 -- This code section is part of implementing an untyped tree
14216 -- traversal, so it needs direct access to node fields.
14219 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
14220 N2
:= Get_Associated_Node
(N
);
14227 -- In an instance within a generic, use the name of the
14228 -- actual and not the original generic parameter. If the
14229 -- actual is global in the current generic it must be
14230 -- preserved for its instantiation.
14232 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
14234 Present
(Generic_Parent_Type
(Parent
(Typ
)))
14236 Typ
:= Base_Type
(Typ
);
14237 Set_Etype
(N2
, Typ
);
14241 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
14242 Set_Associated_Node
(N
, Empty
);
14244 -- If the aggregate is an actual in a call, it has been
14245 -- resolved in the current context, to some local type.
14246 -- The enclosing call may have been disambiguated by the
14247 -- aggregate, and this disambiguation might fail at
14248 -- instantiation time because the type to which the
14249 -- aggregate did resolve is not preserved. In order to
14250 -- preserve some of this information, we wrap the
14251 -- aggregate in a qualified expression, using the id of
14252 -- its type. For further disambiguation we qualify the
14253 -- type name with its scope (if visible) because both
14254 -- id's will have corresponding entities in an instance.
14255 -- This resolves most of the problems with missing type
14256 -- information on aggregates in instances.
14258 if Nkind
(N2
) = Nkind
(N
)
14259 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
14260 and then Comes_From_Source
(Typ
)
14262 if Is_Immediately_Visible
(Scope
(Typ
)) then
14263 Nam
:= Make_Selected_Component
(Loc
,
14265 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
14267 Make_Identifier
(Loc
, Chars
(Typ
)));
14269 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
14273 Make_Qualified_Expression
(Loc
,
14274 Subtype_Mark
=> Nam
,
14275 Expression
=> Relocate_Node
(N
));
14279 Save_Global_Descendant
(Field1
(N
));
14280 Save_Global_Descendant
(Field2
(N
));
14281 Save_Global_Descendant
(Field3
(N
));
14282 Save_Global_Descendant
(Field5
(N
));
14284 if Present
(Qual
) then
14288 -- All other cases than aggregates
14291 Save_Global_Descendant
(Field1
(N
));
14292 Save_Global_Descendant
(Field2
(N
));
14293 Save_Global_Descendant
(Field3
(N
));
14294 Save_Global_Descendant
(Field4
(N
));
14295 Save_Global_Descendant
(Field5
(N
));
14300 -- If a node has aspects, references within their expressions must
14301 -- be saved separately, given they are not directly in the tree.
14303 if Has_Aspects
(N
) then
14308 Aspect
:= First
(Aspect_Specifications
(N
));
14309 while Present
(Aspect
) loop
14310 if Present
(Expression
(Aspect
)) then
14311 Save_Global_References
(Expression
(Aspect
));
14318 end Save_References
;
14320 -- Start of processing for Save_Global_References
14323 Gen_Scope
:= Current_Scope
;
14325 -- If the generic unit is a child unit, references to entities in the
14326 -- parent are treated as local, because they will be resolved anew in
14327 -- the context of the instance of the parent.
14329 while Is_Child_Unit
(Gen_Scope
)
14330 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
14332 Gen_Scope
:= Scope
(Gen_Scope
);
14335 Save_References
(N
);
14336 end Save_Global_References
;
14338 --------------------------------------
14339 -- Set_Copied_Sloc_For_Inlined_Body --
14340 --------------------------------------
14342 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
14344 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
14345 end Set_Copied_Sloc_For_Inlined_Body
;
14347 ---------------------
14348 -- Set_Instance_Of --
14349 ---------------------
14351 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
14353 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
14354 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
14355 Generic_Renamings
.Increment_Last
;
14356 end Set_Instance_Of
;
14358 --------------------
14359 -- Set_Next_Assoc --
14360 --------------------
14362 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
14364 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
14365 end Set_Next_Assoc
;
14367 -------------------
14368 -- Start_Generic --
14369 -------------------
14371 procedure Start_Generic
is
14373 -- ??? More things could be factored out in this routine.
14374 -- Should probably be done at a later stage.
14376 Generic_Flags
.Append
(Inside_A_Generic
);
14377 Inside_A_Generic
:= True;
14379 Expander_Mode_Save_And_Set
(False);
14382 ----------------------
14383 -- Set_Instance_Env --
14384 ----------------------
14386 procedure Set_Instance_Env
14387 (Gen_Unit
: Entity_Id
;
14388 Act_Unit
: Entity_Id
)
14390 Assertion_Status
: constant Boolean := Assertions_Enabled
;
14391 Save_SPARK_Mode
: constant SPARK_Mode_Type
:= SPARK_Mode
;
14392 Save_SPARK_Mode_Pragma
: constant Node_Id
:= SPARK_Mode_Pragma
;
14395 -- Regardless of the current mode, predefined units are analyzed in the
14396 -- most current Ada mode, and earlier version Ada checks do not apply
14397 -- to predefined units. Nothing needs to be done for non-internal units.
14398 -- These are always analyzed in the current mode.
14400 if Is_Internal_File_Name
14401 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
14402 Renamings_Included
=> True)
14404 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
14406 -- In Ada2012 we may want to enable assertions in an instance of a
14407 -- predefined unit, in which case we need to preserve the current
14408 -- setting for the Assertions_Enabled flag. This will become more
14409 -- critical when pre/postconditions are added to predefined units,
14410 -- as is already the case for some numeric libraries.
14412 if Ada_Version
>= Ada_2012
then
14413 Assertions_Enabled
:= Assertion_Status
;
14416 -- SPARK_Mode for an instance is the one applicable at the point of
14419 SPARK_Mode
:= Save_SPARK_Mode
;
14420 SPARK_Mode_Pragma
:= Save_SPARK_Mode_Pragma
;
14423 Current_Instantiated_Parent
:=
14424 (Gen_Id
=> Gen_Unit
,
14425 Act_Id
=> Act_Unit
,
14426 Next_In_HTable
=> Assoc_Null
);
14427 end Set_Instance_Env
;
14433 procedure Switch_View
(T
: Entity_Id
) is
14434 BT
: constant Entity_Id
:= Base_Type
(T
);
14435 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
14436 Priv_Sub
: Entity_Id
;
14439 -- T may be private but its base type may have been exchanged through
14440 -- some other occurrence, in which case there is nothing to switch
14441 -- besides T itself. Note that a private dependent subtype of a private
14442 -- type might not have been switched even if the base type has been,
14443 -- because of the last branch of Check_Private_View (see comment there).
14445 if not Is_Private_Type
(BT
) then
14446 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
14447 Exchange_Declarations
(T
);
14451 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
14453 if Present
(Full_View
(BT
)) then
14454 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
14455 Exchange_Declarations
(BT
);
14458 while Present
(Priv_Elmt
) loop
14459 Priv_Sub
:= (Node
(Priv_Elmt
));
14461 -- We avoid flipping the subtype if the Etype of its full view is
14462 -- private because this would result in a malformed subtype. This
14463 -- occurs when the Etype of the subtype full view is the full view of
14464 -- the base type (and since the base types were just switched, the
14465 -- subtype is pointing to the wrong view). This is currently the case
14466 -- for tagged record types, access types (maybe more?) and needs to
14467 -- be resolved. ???
14469 if Present
(Full_View
(Priv_Sub
))
14470 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
14472 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
14473 Exchange_Declarations
(Priv_Sub
);
14476 Next_Elmt
(Priv_Elmt
);
14484 function True_Parent
(N
: Node_Id
) return Node_Id
is
14486 if Nkind
(Parent
(N
)) = N_Subunit
then
14487 return Parent
(Corresponding_Stub
(Parent
(N
)));
14493 -----------------------------
14494 -- Valid_Default_Attribute --
14495 -----------------------------
14497 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
14498 Attr_Id
: constant Attribute_Id
:=
14499 Get_Attribute_Id
(Attribute_Name
(Def
));
14500 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
14501 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
14507 if No
(T
) or else T
= Any_Id
then
14512 F
:= First_Formal
(Nam
);
14513 while Present
(F
) loop
14514 Num_F
:= Num_F
+ 1;
14519 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
14520 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
14521 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
14522 Attribute_Unbiased_Rounding
=>
14525 and then Is_Floating_Point_Type
(T
);
14527 when Attribute_Image | Attribute_Pred | Attribute_Succ |
14528 Attribute_Value | Attribute_Wide_Image |
14529 Attribute_Wide_Value
=>
14530 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
14532 when Attribute_Max | Attribute_Min
=>
14533 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
14535 when Attribute_Input
=>
14536 OK
:= (Is_Fun
and then Num_F
= 1);
14538 when Attribute_Output | Attribute_Read | Attribute_Write
=>
14539 OK
:= (not Is_Fun
and then Num_F
= 2);
14546 Error_Msg_N
("attribute reference has wrong profile for subprogram",
14549 end Valid_Default_Attribute
;