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 -- A generic package declared within a Ghost scope is rendered Ghost
3384 -- (SPARK RM 6.9(2)).
3386 if Within_Ghost_Scope
then
3387 Set_Is_Ghost_Entity
(Id
);
3390 -- Analyze aspects now, so that generated pragmas appear in the
3391 -- declarations before building and analyzing the generic copy.
3393 if Has_Aspects
(N
) then
3394 Analyze_Aspect_Specifications
(N
, Id
);
3398 Enter_Generic_Scope
(Id
);
3399 Set_Inner_Instances
(Id
, New_Elmt_List
);
3401 Set_Categorization_From_Pragmas
(N
);
3402 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3404 -- Link the declaration of the generic homonym in the generic copy to
3405 -- the package it renames, so that it is always resolved properly.
3407 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3408 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3410 -- For a library unit, we have reconstructed the entity for the unit,
3411 -- and must reset it in the library tables.
3413 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3414 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3417 Analyze_Generic_Formal_Part
(N
);
3419 -- After processing the generic formals, analysis proceeds as for a
3420 -- non-generic package.
3422 Analyze
(Specification
(N
));
3424 Validate_Categorization_Dependency
(N
, Id
);
3428 End_Package_Scope
(Id
);
3429 Exit_Generic_Scope
(Id
);
3431 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3432 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3433 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3434 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3437 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3438 Validate_RT_RAT_Component
(N
);
3440 -- If this is a spec without a body, check that generic parameters
3443 if not Body_Required
(Parent
(N
)) then
3444 Check_References
(Id
);
3448 -- If there is a specified storage pool in the context, create an
3449 -- aspect on the package declaration, so that it is used in any
3450 -- instance that does not override it.
3452 if Present
(Default_Pool
) then
3457 ASN
:= Make_Aspect_Specification
(Loc
,
3458 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3459 Expression
=> New_Copy
(Default_Pool
));
3461 if No
(Aspect_Specifications
(Specification
(N
))) then
3462 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3464 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3468 end Analyze_Generic_Package_Declaration
;
3470 --------------------------------------------
3471 -- Analyze_Generic_Subprogram_Declaration --
3472 --------------------------------------------
3474 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3479 Result_Type
: Entity_Id
;
3480 Save_Parent
: Node_Id
;
3484 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3486 -- Create copy of generic unit, and save for instantiation. If the unit
3487 -- is a child unit, do not copy the specifications for the parent, which
3488 -- are not part of the generic tree.
3490 Save_Parent
:= Parent_Spec
(N
);
3491 Set_Parent_Spec
(N
, Empty
);
3493 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3494 Set_Parent_Spec
(New_N
, Save_Parent
);
3497 -- Once the contents of the generic copy and the template are swapped,
3498 -- do the same for their respective aspect specifications.
3500 Exchange_Aspects
(N
, New_N
);
3502 Spec
:= Specification
(N
);
3503 Id
:= Defining_Entity
(Spec
);
3504 Generate_Definition
(Id
);
3505 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
3507 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3509 ("operator symbol not allowed for generic subprogram", Id
);
3515 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3517 -- Analyze the aspects of the generic copy to ensure that all generated
3518 -- pragmas (if any) perform their semantic effects.
3520 if Has_Aspects
(N
) then
3521 Analyze_Aspect_Specifications
(N
, Id
);
3525 Enter_Generic_Scope
(Id
);
3526 Set_Inner_Instances
(Id
, New_Elmt_List
);
3527 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3529 Analyze_Generic_Formal_Part
(N
);
3531 Formals
:= Parameter_Specifications
(Spec
);
3533 if Present
(Formals
) then
3534 Process_Formals
(Formals
, Spec
);
3537 if Nkind
(Spec
) = N_Function_Specification
then
3538 Set_Ekind
(Id
, E_Generic_Function
);
3540 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3541 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3542 Set_Etype
(Id
, Result_Type
);
3544 -- Check restriction imposed by AI05-073: a generic function
3545 -- cannot return an abstract type or an access to such.
3547 -- This is a binding interpretation should it apply to earlier
3548 -- versions of Ada as well as Ada 2012???
3550 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
3551 and then Ada_Version
>= Ada_2012
3553 Error_Msg_N
("generic function cannot have an access result"
3554 & " that designates an abstract type", Spec
);
3558 Find_Type
(Result_Definition
(Spec
));
3559 Typ
:= Entity
(Result_Definition
(Spec
));
3561 if Is_Abstract_Type
(Typ
)
3562 and then Ada_Version
>= Ada_2012
3565 ("generic function cannot have abstract result type", Spec
);
3568 -- If a null exclusion is imposed on the result type, then create
3569 -- a null-excluding itype (an access subtype) and use it as the
3570 -- function's Etype.
3572 if Is_Access_Type
(Typ
)
3573 and then Null_Exclusion_Present
(Spec
)
3576 Create_Null_Excluding_Itype
3578 Related_Nod
=> Spec
,
3579 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3581 Set_Etype
(Id
, Typ
);
3586 Set_Ekind
(Id
, E_Generic_Procedure
);
3587 Set_Etype
(Id
, Standard_Void_Type
);
3590 -- A generic subprogram declared within a Ghost scope is rendered Ghost
3591 -- (SPARK RM 6.9(2)).
3593 if Within_Ghost_Scope
then
3594 Set_Is_Ghost_Entity
(Id
);
3597 -- For a library unit, we have reconstructed the entity for the unit,
3598 -- and must reset it in the library tables. We also make sure that
3599 -- Body_Required is set properly in the original compilation unit node.
3601 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3602 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3603 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3606 Set_Categorization_From_Pragmas
(N
);
3607 Validate_Categorization_Dependency
(N
, Id
);
3609 Save_Global_References
(Original_Node
(N
));
3611 -- For ASIS purposes, convert any postcondition, precondition pragmas
3612 -- into aspects, if N is not a compilation unit by itself, in order to
3613 -- enable the analysis of expressions inside the corresponding PPC
3616 if ASIS_Mode
and then Is_List_Member
(N
) then
3617 Make_Aspect_For_PPC_In_Gen_Sub_Decl
(N
);
3622 Exit_Generic_Scope
(Id
);
3623 Generate_Reference_To_Formals
(Id
);
3625 List_Inherited_Pre_Post_Aspects
(Id
);
3626 end Analyze_Generic_Subprogram_Declaration
;
3628 -----------------------------------
3629 -- Analyze_Package_Instantiation --
3630 -----------------------------------
3632 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
3633 Loc
: constant Source_Ptr
:= Sloc
(N
);
3634 Gen_Id
: constant Node_Id
:= Name
(N
);
3637 Act_Decl_Name
: Node_Id
;
3638 Act_Decl_Id
: Entity_Id
;
3644 Gen_Unit
: Entity_Id
;
3646 Is_Actual_Pack
: constant Boolean :=
3647 Is_Internal
(Defining_Entity
(N
));
3649 Env_Installed
: Boolean := False;
3650 Parent_Installed
: Boolean := False;
3651 Renaming_List
: List_Id
;
3652 Unit_Renaming
: Node_Id
;
3653 Needs_Body
: Boolean;
3654 Inline_Now
: Boolean := False;
3656 Save_IPSM
: constant Boolean := Ignore_Pragma_SPARK_Mode
;
3657 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
3659 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
3660 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
3661 -- Save the SPARK_Mode-related data for restore on exit
3663 Save_Style_Check
: constant Boolean := Style_Check
;
3664 -- Save style check mode for restore on exit
3666 procedure Delay_Descriptors
(E
: Entity_Id
);
3667 -- Delay generation of subprogram descriptors for given entity
3669 function Might_Inline_Subp
return Boolean;
3670 -- If inlining is active and the generic contains inlined subprograms,
3671 -- we instantiate the body. This may cause superfluous instantiations,
3672 -- but it is simpler than detecting the need for the body at the point
3673 -- of inlining, when the context of the instance is not available.
3675 -----------------------
3676 -- Delay_Descriptors --
3677 -----------------------
3679 procedure Delay_Descriptors
(E
: Entity_Id
) is
3681 if not Delay_Subprogram_Descriptors
(E
) then
3682 Set_Delay_Subprogram_Descriptors
(E
);
3683 Pending_Descriptor
.Append
(E
);
3685 end Delay_Descriptors
;
3687 -----------------------
3688 -- Might_Inline_Subp --
3689 -----------------------
3691 function Might_Inline_Subp
return Boolean is
3695 if not Inline_Processing_Required
then
3699 E
:= First_Entity
(Gen_Unit
);
3700 while Present
(E
) loop
3701 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
3710 end Might_Inline_Subp
;
3712 -- Local declarations
3714 Vis_Prims_List
: Elist_Id
:= No_Elist
;
3715 -- List of primitives made temporarily visible in the instantiation
3716 -- to match the visibility of the formal type
3718 -- Start of processing for Analyze_Package_Instantiation
3721 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3723 -- Very first thing: check for Text_IO sp[ecial unit in case we are
3724 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
3726 Check_Text_IO_Special_Unit
(Name
(N
));
3728 -- Make node global for error reporting
3730 Instantiation_Node
:= N
;
3732 -- Turn off style checking in instances. If the check is enabled on the
3733 -- generic unit, a warning in an instance would just be noise. If not
3734 -- enabled on the generic, then a warning in an instance is just wrong.
3736 Style_Check
:= False;
3738 -- Case of instantiation of a generic package
3740 if Nkind
(N
) = N_Package_Instantiation
then
3741 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3742 Set_Comes_From_Source
(Act_Decl_Id
, True);
3744 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
3746 Make_Defining_Program_Unit_Name
(Loc
,
3747 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
3748 Defining_Identifier
=> Act_Decl_Id
);
3750 Act_Decl_Name
:= Act_Decl_Id
;
3753 -- Case of instantiation of a formal package
3756 Act_Decl_Id
:= Defining_Identifier
(N
);
3757 Act_Decl_Name
:= Act_Decl_Id
;
3760 Generate_Definition
(Act_Decl_Id
);
3761 Preanalyze_Actuals
(N
);
3764 Env_Installed
:= True;
3766 -- Reset renaming map for formal types. The mapping is established
3767 -- when analyzing the generic associations, but some mappings are
3768 -- inherited from formal packages of parent units, and these are
3769 -- constructed when the parents are installed.
3771 Generic_Renamings
.Set_Last
(0);
3772 Generic_Renamings_HTable
.Reset
;
3774 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3775 Gen_Unit
:= Entity
(Gen_Id
);
3777 -- Verify that it is the name of a generic package
3779 -- A visibility glitch: if the instance is a child unit and the generic
3780 -- is the generic unit of a parent instance (i.e. both the parent and
3781 -- the child units are instances of the same package) the name now
3782 -- denotes the renaming within the parent, not the intended generic
3783 -- unit. See if there is a homonym that is the desired generic. The
3784 -- renaming declaration must be visible inside the instance of the
3785 -- child, but not when analyzing the name in the instantiation itself.
3787 if Ekind
(Gen_Unit
) = E_Package
3788 and then Present
(Renamed_Entity
(Gen_Unit
))
3789 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
3790 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
3791 and then Present
(Homonym
(Gen_Unit
))
3793 Gen_Unit
:= Homonym
(Gen_Unit
);
3796 if Etype
(Gen_Unit
) = Any_Type
then
3800 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
3802 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3804 if From_Limited_With
(Gen_Unit
) then
3806 ("cannot instantiate a limited withed package", Gen_Id
);
3809 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
3816 if In_Extended_Main_Source_Unit
(N
) then
3817 Set_Is_Instantiated
(Gen_Unit
);
3818 Generate_Reference
(Gen_Unit
, N
);
3820 if Present
(Renamed_Object
(Gen_Unit
)) then
3821 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
3822 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
3826 if Nkind
(Gen_Id
) = N_Identifier
3827 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3830 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3832 elsif Nkind
(Gen_Id
) = N_Expanded_Name
3833 and then Is_Child_Unit
(Gen_Unit
)
3834 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
3835 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
3838 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
3841 Set_Entity
(Gen_Id
, Gen_Unit
);
3843 -- If generic is a renaming, get original generic unit
3845 if Present
(Renamed_Object
(Gen_Unit
))
3846 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
3848 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3851 -- Verify that there are no circular instantiations
3853 if In_Open_Scopes
(Gen_Unit
) then
3854 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3858 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3859 Error_Msg_Node_2
:= Current_Scope
;
3861 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3862 Circularity_Detected
:= True;
3867 -- If the context of the instance is subject to SPARK_Mode "off",
3868 -- set the global flag which signals Analyze_Pragma to ignore all
3869 -- SPARK_Mode pragmas within the instance.
3871 if SPARK_Mode
= Off
then
3872 Ignore_Pragma_SPARK_Mode
:= True;
3875 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3876 Gen_Spec
:= Specification
(Gen_Decl
);
3878 -- Initialize renamings map, for error checking, and the list that
3879 -- holds private entities whose views have changed between generic
3880 -- definition and instantiation. If this is the instance created to
3881 -- validate an actual package, the instantiation environment is that
3882 -- of the enclosing instance.
3884 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3886 -- Copy original generic tree, to produce text for instantiation
3890 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3892 Act_Spec
:= Specification
(Act_Tree
);
3894 -- If this is the instance created to validate an actual package,
3895 -- only the formals matter, do not examine the package spec itself.
3897 if Is_Actual_Pack
then
3898 Set_Visible_Declarations
(Act_Spec
, New_List
);
3899 Set_Private_Declarations
(Act_Spec
, New_List
);
3903 Analyze_Associations
3905 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
3906 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
3908 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
3910 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3911 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3912 Set_Is_Generic_Instance
(Act_Decl_Id
);
3913 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3915 -- References to the generic in its own declaration or its body are
3916 -- references to the instance. Add a renaming declaration for the
3917 -- generic unit itself. This declaration, as well as the renaming
3918 -- declarations for the generic formals, must remain private to the
3919 -- unit: the formals, because this is the language semantics, and
3920 -- the unit because its use is an artifact of the implementation.
3923 Make_Package_Renaming_Declaration
(Loc
,
3924 Defining_Unit_Name
=>
3925 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3926 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
3928 Append
(Unit_Renaming
, Renaming_List
);
3930 -- The renaming declarations are the first local declarations of the
3933 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3935 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3937 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3940 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
3942 -- Propagate the aspect specifications from the package declaration
3943 -- template to the instantiated version of the package declaration.
3945 if Has_Aspects
(Act_Tree
) then
3946 Set_Aspect_Specifications
(Act_Decl
,
3947 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
3950 -- The generic may have a generated Default_Storage_Pool aspect,
3951 -- set at the point of generic declaration. If the instance has
3952 -- that aspect, it overrides the one inherited from the generic.
3954 if Has_Aspects
(Gen_Spec
) then
3955 if No
(Aspect_Specifications
(N
)) then
3956 Set_Aspect_Specifications
(N
,
3958 (Aspect_Specifications
(Gen_Spec
))));
3962 ASN1
, ASN2
: Node_Id
;
3965 ASN1
:= First
(Aspect_Specifications
(N
));
3966 while Present
(ASN1
) loop
3967 if Chars
(Identifier
(ASN1
))
3968 = Name_Default_Storage_Pool
3970 -- If generic carries a default storage pool, remove
3971 -- it in favor of the instance one.
3973 ASN2
:= First
(Aspect_Specifications
(Gen_Spec
));
3974 while Present
(ASN2
) loop
3975 if Chars
(Identifier
(ASN2
))
3976 = Name_Default_Storage_Pool
3989 Prepend_List_To
(Aspect_Specifications
(N
),
3991 (Aspect_Specifications
(Gen_Spec
))));
3996 -- Save the instantiation node, for subsequent instantiation of the
3997 -- body, if there is one and we are generating code for the current
3998 -- unit. Mark unit as having a body (avoids premature error message).
4000 -- We instantiate the body if we are generating code, if we are
4001 -- generating cross-reference information, or if we are building
4002 -- trees for ASIS use or GNATprove use.
4005 Enclosing_Body_Present
: Boolean := False;
4006 -- If the generic unit is not a compilation unit, then a body may
4007 -- be present in its parent even if none is required. We create a
4008 -- tentative pending instantiation for the body, which will be
4009 -- discarded if none is actually present.
4014 if Scope
(Gen_Unit
) /= Standard_Standard
4015 and then not Is_Child_Unit
(Gen_Unit
)
4017 Scop
:= Scope
(Gen_Unit
);
4019 while Present
(Scop
)
4020 and then Scop
/= Standard_Standard
4022 if Unit_Requires_Body
(Scop
) then
4023 Enclosing_Body_Present
:= True;
4026 elsif In_Open_Scopes
(Scop
)
4027 and then In_Package_Body
(Scop
)
4029 Enclosing_Body_Present
:= True;
4033 exit when Is_Compilation_Unit
(Scop
);
4034 Scop
:= Scope
(Scop
);
4038 -- If front-end inlining is enabled, and this is a unit for which
4039 -- code will be generated, we instantiate the body at once.
4041 -- This is done if the instance is not the main unit, and if the
4042 -- generic is not a child unit of another generic, to avoid scope
4043 -- problems and the reinstallation of parent instances.
4046 and then (not Is_Child_Unit
(Gen_Unit
)
4047 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4048 and then Might_Inline_Subp
4049 and then not Is_Actual_Pack
4051 if not Back_End_Inlining
4052 and then Front_End_Inlining
4053 and then (Is_In_Main_Unit
(N
)
4054 or else In_Main_Context
(Current_Scope
))
4055 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4059 -- In configurable_run_time mode we force the inlining of
4060 -- predefined subprograms marked Inline_Always, to minimize
4061 -- the use of the run-time library.
4063 elsif Is_Predefined_File_Name
4064 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
4065 and then Configurable_Run_Time_Mode
4066 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4071 -- If the current scope is itself an instance within a child
4072 -- unit, there will be duplications in the scope stack, and the
4073 -- unstacking mechanism in Inline_Instance_Body will fail.
4074 -- This loses some rare cases of optimization, and might be
4075 -- improved some day, if we can find a proper abstraction for
4076 -- "the complete compilation context" that can be saved and
4079 if Is_Generic_Instance
(Current_Scope
) then
4081 Curr_Unit
: constant Entity_Id
:=
4082 Cunit_Entity
(Current_Sem_Unit
);
4084 if Curr_Unit
/= Current_Scope
4085 and then Is_Child_Unit
(Curr_Unit
)
4087 Inline_Now
:= False;
4094 (Unit_Requires_Body
(Gen_Unit
)
4095 or else Enclosing_Body_Present
4096 or else Present
(Corresponding_Body
(Gen_Decl
)))
4097 and then (Is_In_Main_Unit
(N
) or else Might_Inline_Subp
)
4098 and then not Is_Actual_Pack
4099 and then not Inline_Now
4100 and then (Operating_Mode
= Generate_Code
4102 -- Need comment for this check ???
4104 or else (Operating_Mode
= Check_Semantics
4105 and then (ASIS_Mode
or GNATprove_Mode
)));
4107 -- If front_end_inlining is enabled, do not instantiate body if
4108 -- within a generic context.
4110 if (Front_End_Inlining
and then not Expander_Active
)
4111 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
4113 Needs_Body
:= False;
4116 -- If the current context is generic, and the package being
4117 -- instantiated is declared within a formal package, there is no
4118 -- body to instantiate until the enclosing generic is instantiated
4119 -- and there is an actual for the formal package. If the formal
4120 -- package has parameters, we build a regular package instance for
4121 -- it, that precedes the original formal package declaration.
4123 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4125 Decl
: constant Node_Id
:=
4127 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4129 if Nkind
(Decl
) = N_Formal_Package_Declaration
4130 or else (Nkind
(Decl
) = N_Package_Declaration
4131 and then Is_List_Member
(Decl
)
4132 and then Present
(Next
(Decl
))
4134 Nkind
(Next
(Decl
)) =
4135 N_Formal_Package_Declaration
)
4137 Needs_Body
:= False;
4143 -- For RCI unit calling stubs, we omit the instance body if the
4144 -- instance is the RCI library unit itself.
4146 -- However there is a special case for nested instances: in this case
4147 -- we do generate the instance body, as it might be required, e.g.
4148 -- because it provides stream attributes for some type used in the
4149 -- profile of a remote subprogram. This is consistent with 12.3(12),
4150 -- which indicates that the instance body occurs at the place of the
4151 -- instantiation, and thus is part of the RCI declaration, which is
4152 -- present on all client partitions (this is E.2.3(18)).
4154 -- Note that AI12-0002 may make it illegal at some point to have
4155 -- stream attributes defined in an RCI unit, in which case this
4156 -- special case will become unnecessary. In the meantime, there
4157 -- is known application code in production that depends on this
4158 -- being possible, so we definitely cannot eliminate the body in
4159 -- the case of nested instances for the time being.
4161 -- When we generate a nested instance body, calling stubs for any
4162 -- relevant subprogram will be be inserted immediately after the
4163 -- subprogram declarations, and will take precedence over the
4164 -- subsequent (original) body. (The stub and original body will be
4165 -- complete homographs, but this is permitted in an instance).
4166 -- (Could we do better and remove the original body???)
4168 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4169 and then Comes_From_Source
(N
)
4170 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4172 Needs_Body
:= False;
4177 -- Here is a defence against a ludicrous number of instantiations
4178 -- caused by a circular set of instantiation attempts.
4180 if Pending_Instantiations
.Last
> Maximum_Instantiations
then
4181 Error_Msg_Uint_1
:= UI_From_Int
(Maximum_Instantiations
);
4182 Error_Msg_N
("too many instantiations, exceeds max of^", N
);
4183 Error_Msg_N
("\limit can be changed using -gnateinn switch", N
);
4184 raise Unrecoverable_Error
;
4187 -- Indicate that the enclosing scopes contain an instantiation,
4188 -- and that cleanup actions should be delayed until after the
4189 -- instance body is expanded.
4191 Check_Forward_Instantiation
(Gen_Decl
);
4192 if Nkind
(N
) = N_Package_Instantiation
then
4194 Enclosing_Master
: Entity_Id
;
4197 -- Loop to search enclosing masters
4199 Enclosing_Master
:= Current_Scope
;
4200 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
4201 if Ekind
(Enclosing_Master
) = E_Package
then
4202 if Is_Compilation_Unit
(Enclosing_Master
) then
4203 if In_Package_Body
(Enclosing_Master
) then
4205 (Body_Entity
(Enclosing_Master
));
4214 Enclosing_Master
:= Scope
(Enclosing_Master
);
4217 elsif Is_Generic_Unit
(Enclosing_Master
)
4218 or else Ekind
(Enclosing_Master
) = E_Void
4220 -- Cleanup actions will eventually be performed on the
4221 -- enclosing subprogram or package instance, if any.
4222 -- Enclosing scope is void in the formal part of a
4223 -- generic subprogram.
4228 if Ekind
(Enclosing_Master
) = E_Entry
4230 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
4232 if not Expander_Active
then
4236 Protected_Body_Subprogram
(Enclosing_Master
);
4240 Set_Delay_Cleanups
(Enclosing_Master
);
4242 while Ekind
(Enclosing_Master
) = E_Block
loop
4243 Enclosing_Master
:= Scope
(Enclosing_Master
);
4246 if Is_Subprogram
(Enclosing_Master
) then
4247 Delay_Descriptors
(Enclosing_Master
);
4249 elsif Is_Task_Type
(Enclosing_Master
) then
4251 TBP
: constant Node_Id
:=
4252 Get_Task_Body_Procedure
4255 if Present
(TBP
) then
4256 Delay_Descriptors
(TBP
);
4257 Set_Delay_Cleanups
(TBP
);
4264 end loop Scope_Loop
;
4267 -- Make entry in table
4269 Pending_Instantiations
.Append
4271 Act_Decl
=> Act_Decl
,
4272 Expander_Status
=> Expander_Active
,
4273 Current_Sem_Unit
=> Current_Sem_Unit
,
4274 Scope_Suppress
=> Scope_Suppress
,
4275 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4276 Version
=> Ada_Version
,
4277 Version_Pragma
=> Ada_Version_Pragma
,
4278 Warnings
=> Save_Warnings
,
4279 SPARK_Mode
=> SPARK_Mode
,
4280 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
4284 Set_Categorization_From_Pragmas
(Act_Decl
);
4286 if Parent_Installed
then
4290 Set_Instance_Spec
(N
, Act_Decl
);
4292 -- If not a compilation unit, insert the package declaration before
4293 -- the original instantiation node.
4295 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4296 Mark_Rewrite_Insertion
(Act_Decl
);
4297 Insert_Before
(N
, Act_Decl
);
4299 if Has_Aspects
(N
) then
4300 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4302 -- The pragma created for a Default_Storage_Pool aspect must
4303 -- appear ahead of the declarations in the instance spec.
4304 -- Analysis has placed it after the instance node, so remove
4305 -- it and reinsert it properly now.
4308 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4309 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4313 if A_Name
= Name_Default_Storage_Pool
then
4314 if No
(Visible_Declarations
(Act_Spec
)) then
4315 Set_Visible_Declarations
(Act_Spec
, New_List
);
4319 while Present
(Decl
) loop
4320 if Nkind
(Decl
) = N_Pragma
then
4322 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4334 -- For an instantiation that is a compilation unit, place
4335 -- declaration on current node so context is complete for analysis
4336 -- (including nested instantiations). If this is the main unit,
4337 -- the declaration eventually replaces the instantiation node.
4338 -- If the instance body is created later, it replaces the
4339 -- instance node, and the declaration is attached to it
4340 -- (see Build_Instance_Compilation_Unit_Nodes).
4343 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4345 -- The entity for the current unit is the newly created one,
4346 -- and all semantic information is attached to it.
4348 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4350 -- If this is the main unit, replace the main entity as well
4352 if Current_Sem_Unit
= Main_Unit
then
4353 Main_Unit_Entity
:= Act_Decl_Id
;
4357 Set_Unit
(Parent
(N
), Act_Decl
);
4358 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4359 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4361 -- Process aspect specifications of the instance node, if any, to
4362 -- take into account categorization pragmas before analyzing the
4365 if Has_Aspects
(N
) then
4366 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4370 Set_Unit
(Parent
(N
), N
);
4371 Set_Body_Required
(Parent
(N
), False);
4373 -- We never need elaboration checks on instantiations, since by
4374 -- definition, the body instantiation is elaborated at the same
4375 -- time as the spec instantiation.
4377 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4378 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4381 Check_Elab_Instantiation
(N
);
4383 if ABE_Is_Certain
(N
) and then Needs_Body
then
4384 Pending_Instantiations
.Decrement_Last
;
4387 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4389 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4390 First_Private_Entity
(Act_Decl_Id
));
4392 -- If the instantiation will receive a body, the unit will be
4393 -- transformed into a package body, and receive its own elaboration
4394 -- entity. Otherwise, the nature of the unit is now a package
4397 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4398 and then not Needs_Body
4400 Rewrite
(N
, Act_Decl
);
4403 if Present
(Corresponding_Body
(Gen_Decl
))
4404 or else Unit_Requires_Body
(Gen_Unit
)
4406 Set_Has_Completion
(Act_Decl_Id
);
4409 Check_Formal_Packages
(Act_Decl_Id
);
4411 Restore_Hidden_Primitives
(Vis_Prims_List
);
4412 Restore_Private_Views
(Act_Decl_Id
);
4414 Inherit_Context
(Gen_Decl
, N
);
4416 if Parent_Installed
then
4421 Env_Installed
:= False;
4424 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4426 -- There used to be a check here to prevent instantiations in local
4427 -- contexts if the No_Local_Allocators restriction was active. This
4428 -- check was removed by a binding interpretation in AI-95-00130/07,
4429 -- but we retain the code for documentation purposes.
4431 -- if Ekind (Act_Decl_Id) /= E_Void
4432 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4434 -- Check_Restriction (No_Local_Allocators, N);
4438 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4441 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4442 -- be used as defining identifiers for a formal package and for the
4443 -- corresponding expanded package.
4445 if Nkind
(N
) = N_Formal_Package_Declaration
then
4446 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4447 Set_Comes_From_Source
(Act_Decl_Id
, True);
4448 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
4449 Set_Defining_Identifier
(N
, Act_Decl_Id
);
4452 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
4453 SPARK_Mode
:= Save_SM
;
4454 SPARK_Mode_Pragma
:= Save_SMP
;
4455 Style_Check
:= Save_Style_Check
;
4457 -- Check that if N is an instantiation of System.Dim_Float_IO or
4458 -- System.Dim_Integer_IO, the formal type has a dimension system.
4460 if Nkind
(N
) = N_Package_Instantiation
4461 and then Is_Dim_IO_Package_Instantiation
(N
)
4464 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4466 if not Has_Dimension_System
4467 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4469 Error_Msg_N
("type with a dimension system expected", Assoc
);
4475 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4476 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4480 when Instantiation_Error
=>
4481 if Parent_Installed
then
4485 if Env_Installed
then
4489 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
4490 SPARK_Mode
:= Save_SM
;
4491 SPARK_Mode_Pragma
:= Save_SMP
;
4492 Style_Check
:= Save_Style_Check
;
4493 end Analyze_Package_Instantiation
;
4495 --------------------------
4496 -- Inline_Instance_Body --
4497 --------------------------
4499 procedure Inline_Instance_Body
4501 Gen_Unit
: Entity_Id
;
4504 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
4505 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
4506 Gen_Comp
: constant Entity_Id
:=
4507 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
4509 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4510 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4511 -- Save all SPARK_Mode-related attributes as removing enclosing scopes
4512 -- to provide a clean environment for analysis of the inlined body will
4513 -- eliminate any previously set SPARK_Mode.
4515 Scope_Stack_Depth
: constant Int
:=
4516 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
4518 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
4519 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4520 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4521 Curr_Scope
: Entity_Id
:= Empty
;
4523 Num_Inner
: Int
:= 0;
4524 Num_Scopes
: Int
:= 0;
4525 N_Instances
: Int
:= 0;
4526 Removed
: Boolean := False;
4531 -- Case of generic unit defined in another unit. We must remove the
4532 -- complete context of the current unit to install that of the generic.
4534 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
4536 -- Add some comments for the following two loops ???
4539 while Present
(S
) and then S
/= Standard_Standard
loop
4541 Num_Scopes
:= Num_Scopes
+ 1;
4543 Use_Clauses
(Num_Scopes
) :=
4545 (Scope_Stack
.Last
- Num_Scopes
+ 1).
4547 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
4549 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
4550 or else Scope_Stack
.Table
4551 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
4554 exit when Is_Generic_Instance
(S
)
4555 and then (In_Package_Body
(S
)
4556 or else Ekind
(S
) = E_Procedure
4557 or else Ekind
(S
) = E_Function
);
4561 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
4563 -- Find and save all enclosing instances
4568 and then S
/= Standard_Standard
4570 if Is_Generic_Instance
(S
) then
4571 N_Instances
:= N_Instances
+ 1;
4572 Instances
(N_Instances
) := S
;
4574 exit when In_Package_Body
(S
);
4580 -- Remove context of current compilation unit, unless we are within a
4581 -- nested package instantiation, in which case the context has been
4582 -- removed previously.
4584 -- If current scope is the body of a child unit, remove context of
4585 -- spec as well. If an enclosing scope is an instance body, the
4586 -- context has already been removed, but the entities in the body
4587 -- must be made invisible as well.
4592 and then S
/= Standard_Standard
4594 if Is_Generic_Instance
(S
)
4595 and then (In_Package_Body
(S
)
4596 or else Ekind_In
(S
, E_Procedure
, E_Function
))
4598 -- We still have to remove the entities of the enclosing
4599 -- instance from direct visibility.
4604 E
:= First_Entity
(S
);
4605 while Present
(E
) loop
4606 Set_Is_Immediately_Visible
(E
, False);
4615 or else (Ekind
(Curr_Unit
) = E_Package_Body
4616 and then S
= Spec_Entity
(Curr_Unit
))
4617 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
4620 (Unit_Declaration_Node
(Curr_Unit
)))
4624 -- Remove entities in current scopes from visibility, so that
4625 -- instance body is compiled in a clean environment.
4627 List
:= Save_Scope_Stack
(Handle_Use
=> False);
4629 if Is_Child_Unit
(S
) then
4631 -- Remove child unit from stack, as well as inner scopes.
4632 -- Removing the context of a child unit removes parent units
4635 while Current_Scope
/= S
loop
4636 Num_Inner
:= Num_Inner
+ 1;
4637 Inner_Scopes
(Num_Inner
) := Current_Scope
;
4642 Remove_Context
(Curr_Comp
);
4646 Remove_Context
(Curr_Comp
);
4649 if Ekind
(Curr_Unit
) = E_Package_Body
then
4650 Remove_Context
(Library_Unit
(Curr_Comp
));
4657 pragma Assert
(Num_Inner
< Num_Scopes
);
4659 -- The inlined package body must be analyzed with the SPARK_Mode of
4660 -- the enclosing context, otherwise the body may cause bogus errors
4661 -- if a configuration SPARK_Mode pragma in in effect.
4663 Push_Scope
(Standard_Standard
);
4664 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
4665 Instantiate_Package_Body
4668 Act_Decl
=> Act_Decl
,
4669 Expander_Status
=> Expander_Active
,
4670 Current_Sem_Unit
=> Current_Sem_Unit
,
4671 Scope_Suppress
=> Scope_Suppress
,
4672 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4673 Version
=> Ada_Version
,
4674 Version_Pragma
=> Ada_Version_Pragma
,
4675 Warnings
=> Save_Warnings
,
4676 SPARK_Mode
=> Save_SM
,
4677 SPARK_Mode_Pragma
=> Save_SMP
)),
4678 Inlined_Body
=> True);
4684 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
4686 -- Reset Generic_Instance flag so that use clauses can be installed
4687 -- in the proper order. (See Use_One_Package for effect of enclosing
4688 -- instances on processing of use clauses).
4690 for J
in 1 .. N_Instances
loop
4691 Set_Is_Generic_Instance
(Instances
(J
), False);
4695 Install_Context
(Curr_Comp
);
4697 if Present
(Curr_Scope
)
4698 and then Is_Child_Unit
(Curr_Scope
)
4700 Push_Scope
(Curr_Scope
);
4701 Set_Is_Immediately_Visible
(Curr_Scope
);
4703 -- Finally, restore inner scopes as well
4705 for J
in reverse 1 .. Num_Inner
loop
4706 Push_Scope
(Inner_Scopes
(J
));
4710 Restore_Scope_Stack
(List
, Handle_Use
=> False);
4712 if Present
(Curr_Scope
)
4714 (In_Private_Part
(Curr_Scope
)
4715 or else In_Package_Body
(Curr_Scope
))
4717 -- Install private declaration of ancestor units, which are
4718 -- currently available. Restore_Scope_Stack and Install_Context
4719 -- only install the visible part of parents.
4724 Par
:= Scope
(Curr_Scope
);
4725 while (Present
(Par
))
4726 and then Par
/= Standard_Standard
4728 Install_Private_Declarations
(Par
);
4735 -- Restore use clauses. For a child unit, use clauses in the parents
4736 -- are restored when installing the context, so only those in inner
4737 -- scopes (and those local to the child unit itself) need to be
4738 -- installed explicitly.
4740 if Is_Child_Unit
(Curr_Unit
)
4743 for J
in reverse 1 .. Num_Inner
+ 1 loop
4744 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4746 Install_Use_Clauses
(Use_Clauses
(J
));
4750 for J
in reverse 1 .. Num_Scopes
loop
4751 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4753 Install_Use_Clauses
(Use_Clauses
(J
));
4757 -- Restore status of instances. If one of them is a body, make its
4758 -- local entities visible again.
4765 for J
in 1 .. N_Instances
loop
4766 Inst
:= Instances
(J
);
4767 Set_Is_Generic_Instance
(Inst
, True);
4769 if In_Package_Body
(Inst
)
4770 or else Ekind_In
(S
, E_Procedure
, E_Function
)
4772 E
:= First_Entity
(Instances
(J
));
4773 while Present
(E
) loop
4774 Set_Is_Immediately_Visible
(E
);
4781 -- If generic unit is in current unit, current context is correct. Note
4782 -- that the context is guaranteed to carry the correct SPARK_Mode as no
4783 -- enclosing scopes were removed.
4786 Instantiate_Package_Body
4789 Act_Decl
=> Act_Decl
,
4790 Expander_Status
=> Expander_Active
,
4791 Current_Sem_Unit
=> Current_Sem_Unit
,
4792 Scope_Suppress
=> Scope_Suppress
,
4793 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4794 Version
=> Ada_Version
,
4795 Version_Pragma
=> Ada_Version_Pragma
,
4796 Warnings
=> Save_Warnings
,
4797 SPARK_Mode
=> SPARK_Mode
,
4798 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
4799 Inlined_Body
=> True);
4801 end Inline_Instance_Body
;
4803 -------------------------------------
4804 -- Analyze_Procedure_Instantiation --
4805 -------------------------------------
4807 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
4809 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
4810 end Analyze_Procedure_Instantiation
;
4812 -----------------------------------
4813 -- Need_Subprogram_Instance_Body --
4814 -----------------------------------
4816 function Need_Subprogram_Instance_Body
4818 Subp
: Entity_Id
) return Boolean
4821 -- Must be inlined (or inlined renaming)
4823 if (Is_In_Main_Unit
(N
)
4824 or else Is_Inlined
(Subp
)
4825 or else Is_Inlined
(Alias
(Subp
)))
4827 -- Must be generating code or analyzing code in ASIS/GNATprove mode
4829 and then (Operating_Mode
= Generate_Code
4830 or else (Operating_Mode
= Check_Semantics
4831 and then (ASIS_Mode
or GNATprove_Mode
)))
4833 -- The body is needed when generating code (full expansion), in ASIS
4834 -- mode for other tools, and in GNATprove mode (special expansion) for
4835 -- formal verification of the body itself.
4837 and then (Expander_Active
or ASIS_Mode
or GNATprove_Mode
)
4839 -- No point in inlining if ABE is inevitable
4841 and then not ABE_Is_Certain
(N
)
4843 -- Or if subprogram is eliminated
4845 and then not Is_Eliminated
(Subp
)
4847 Pending_Instantiations
.Append
4849 Act_Decl
=> Unit_Declaration_Node
(Subp
),
4850 Expander_Status
=> Expander_Active
,
4851 Current_Sem_Unit
=> Current_Sem_Unit
,
4852 Scope_Suppress
=> Scope_Suppress
,
4853 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4854 Version
=> Ada_Version
,
4855 Version_Pragma
=> Ada_Version_Pragma
,
4856 Warnings
=> Save_Warnings
,
4857 SPARK_Mode
=> SPARK_Mode
,
4858 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
4861 -- Here if not inlined, or we ignore the inlining
4866 end Need_Subprogram_Instance_Body
;
4868 --------------------------------------
4869 -- Analyze_Subprogram_Instantiation --
4870 --------------------------------------
4872 procedure Analyze_Subprogram_Instantiation
4876 Loc
: constant Source_Ptr
:= Sloc
(N
);
4877 Gen_Id
: constant Node_Id
:= Name
(N
);
4879 Anon_Id
: constant Entity_Id
:=
4880 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
4881 Chars
=> New_External_Name
4882 (Chars
(Defining_Entity
(N
)), 'R'));
4884 Act_Decl_Id
: Entity_Id
;
4889 Env_Installed
: Boolean := False;
4890 Gen_Unit
: Entity_Id
;
4892 Pack_Id
: Entity_Id
;
4893 Parent_Installed
: Boolean := False;
4894 Renaming_List
: List_Id
;
4896 procedure Analyze_Instance_And_Renamings
;
4897 -- The instance must be analyzed in a context that includes the mappings
4898 -- of generic parameters into actuals. We create a package declaration
4899 -- for this purpose, and a subprogram with an internal name within the
4900 -- package. The subprogram instance is simply an alias for the internal
4901 -- subprogram, declared in the current scope.
4903 ------------------------------------
4904 -- Analyze_Instance_And_Renamings --
4905 ------------------------------------
4907 procedure Analyze_Instance_And_Renamings
is
4908 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
4909 Pack_Decl
: Node_Id
;
4912 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4914 -- For the case of a compilation unit, the container package has
4915 -- the same name as the instantiation, to insure that the binder
4916 -- calls the elaboration procedure with the right name. Copy the
4917 -- entity of the instance, which may have compilation level flags
4918 -- (e.g. Is_Child_Unit) set.
4920 Pack_Id
:= New_Copy
(Def_Ent
);
4923 -- Otherwise we use the name of the instantiation concatenated
4924 -- with its source position to ensure uniqueness if there are
4925 -- several instantiations with the same name.
4928 Make_Defining_Identifier
(Loc
,
4929 Chars
=> New_External_Name
4930 (Related_Id
=> Chars
(Def_Ent
),
4932 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
4935 Pack_Decl
:= Make_Package_Declaration
(Loc
,
4936 Specification
=> Make_Package_Specification
(Loc
,
4937 Defining_Unit_Name
=> Pack_Id
,
4938 Visible_Declarations
=> Renaming_List
,
4939 End_Label
=> Empty
));
4941 Set_Instance_Spec
(N
, Pack_Decl
);
4942 Set_Is_Generic_Instance
(Pack_Id
);
4943 Set_Debug_Info_Needed
(Pack_Id
);
4945 -- Case of not a compilation unit
4947 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4948 Mark_Rewrite_Insertion
(Pack_Decl
);
4949 Insert_Before
(N
, Pack_Decl
);
4950 Set_Has_Completion
(Pack_Id
);
4952 -- Case of an instantiation that is a compilation unit
4954 -- Place declaration on current node so context is complete for
4955 -- analysis (including nested instantiations), and for use in a
4956 -- context_clause (see Analyze_With_Clause).
4959 Set_Unit
(Parent
(N
), Pack_Decl
);
4960 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
4963 Analyze
(Pack_Decl
);
4964 Check_Formal_Packages
(Pack_Id
);
4965 Set_Is_Generic_Instance
(Pack_Id
, False);
4967 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4970 -- Body of the enclosing package is supplied when instantiating the
4971 -- subprogram body, after semantic analysis is completed.
4973 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4975 -- Remove package itself from visibility, so it does not
4976 -- conflict with subprogram.
4978 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
4980 -- Set name and scope of internal subprogram so that the proper
4981 -- external name will be generated. The proper scope is the scope
4982 -- of the wrapper package. We need to generate debugging info for
4983 -- the internal subprogram, so set flag accordingly.
4985 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
4986 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
4988 -- Mark wrapper package as referenced, to avoid spurious warnings
4989 -- if the instantiation appears in various with_ clauses of
4990 -- subunits of the main unit.
4992 Set_Referenced
(Pack_Id
);
4995 Set_Is_Generic_Instance
(Anon_Id
);
4996 Set_Debug_Info_Needed
(Anon_Id
);
4997 Act_Decl_Id
:= New_Copy
(Anon_Id
);
4999 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5000 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5001 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5002 Set_Comes_From_Source
(Act_Decl_Id
, True);
5004 -- The signature may involve types that are not frozen yet, but the
5005 -- subprogram will be frozen at the point the wrapper package is
5006 -- frozen, so it does not need its own freeze node. In fact, if one
5007 -- is created, it might conflict with the freezing actions from the
5010 Set_Has_Delayed_Freeze
(Anon_Id
, False);
5012 -- If the instance is a child unit, mark the Id accordingly. Mark
5013 -- the anonymous entity as well, which is the real subprogram and
5014 -- which is used when the instance appears in a context clause.
5015 -- Similarly, propagate the Is_Eliminated flag to handle properly
5016 -- nested eliminated subprograms.
5018 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5019 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5020 New_Overloaded_Entity
(Act_Decl_Id
);
5021 Check_Eliminated
(Act_Decl_Id
);
5022 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5024 -- In compilation unit case, kill elaboration checks on the
5025 -- instantiation, since they are never needed -- the body is
5026 -- instantiated at the same point as the spec.
5028 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5029 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5030 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5031 Set_Is_Compilation_Unit
(Anon_Id
);
5033 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5036 -- The instance is not a freezing point for the new subprogram
5038 Set_Is_Frozen
(Act_Decl_Id
, False);
5040 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5041 Valid_Operator_Definition
(Act_Decl_Id
);
5044 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5045 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5046 Set_Has_Completion
(Act_Decl_Id
);
5047 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5049 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5050 Set_Body_Required
(Parent
(N
), False);
5052 end Analyze_Instance_And_Renamings
;
5056 Save_IPSM
: constant Boolean := Ignore_Pragma_SPARK_Mode
;
5057 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
5059 Save_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5060 Save_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5061 -- Save the SPARK_Mode-related data for restore on exit
5063 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5064 -- List of primitives made temporarily visible in the instantiation
5065 -- to match the visibility of the formal type
5067 -- Start of processing for Analyze_Subprogram_Instantiation
5070 Check_SPARK_05_Restriction
("generic is not allowed", N
);
5072 -- Very first thing: check for special Text_IO unit in case we are
5073 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5074 -- such an instantiation is bogus (these are packages, not subprograms),
5075 -- but we get a better error message if we do this.
5077 Check_Text_IO_Special_Unit
(Gen_Id
);
5079 -- Make node global for error reporting
5081 Instantiation_Node
:= N
;
5083 -- For package instantiations we turn off style checks, because they
5084 -- will have been emitted in the generic. For subprogram instantiations
5085 -- we want to apply at least the check on overriding indicators so we
5086 -- do not modify the style check status.
5088 -- The renaming declarations for the actuals do not come from source and
5089 -- will not generate spurious warnings.
5091 Preanalyze_Actuals
(N
);
5094 Env_Installed
:= True;
5095 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5096 Gen_Unit
:= Entity
(Gen_Id
);
5098 Generate_Reference
(Gen_Unit
, Gen_Id
);
5100 if Nkind
(Gen_Id
) = N_Identifier
5101 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5104 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5107 if Etype
(Gen_Unit
) = Any_Type
then
5112 -- Verify that it is a generic subprogram of the right kind, and that
5113 -- it does not lead to a circular instantiation.
5115 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5117 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5119 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5121 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5123 elsif In_Open_Scopes
(Gen_Unit
) then
5124 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5127 -- If the context of the instance is subject to SPARK_Mode "off",
5128 -- set the global flag which signals Analyze_Pragma to ignore all
5129 -- SPARK_Mode pragmas within the instance.
5131 if SPARK_Mode
= Off
then
5132 Ignore_Pragma_SPARK_Mode
:= True;
5135 Set_Entity
(Gen_Id
, Gen_Unit
);
5136 Set_Is_Instantiated
(Gen_Unit
);
5138 if In_Extended_Main_Source_Unit
(N
) then
5139 Generate_Reference
(Gen_Unit
, N
);
5142 -- If renaming, get original unit
5144 if Present
(Renamed_Object
(Gen_Unit
))
5145 and then Ekind_In
(Renamed_Object
(Gen_Unit
), E_Generic_Procedure
,
5148 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
5149 Set_Is_Instantiated
(Gen_Unit
);
5150 Generate_Reference
(Gen_Unit
, N
);
5153 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5154 Error_Msg_Node_2
:= Current_Scope
;
5156 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
5157 Circularity_Detected
:= True;
5158 Restore_Hidden_Primitives
(Vis_Prims_List
);
5162 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5164 -- Initialize renamings map, for error checking
5166 Generic_Renamings
.Set_Last
(0);
5167 Generic_Renamings_HTable
.Reset
;
5169 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
5171 -- Copy original generic tree, to produce text for instantiation
5175 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5177 -- Inherit overriding indicator from instance node
5179 Act_Spec
:= Specification
(Act_Tree
);
5180 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5181 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5184 Analyze_Associations
5186 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5187 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5189 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5191 -- The subprogram itself cannot contain a nested instance, so the
5192 -- current parent is left empty.
5194 Set_Instance_Env
(Gen_Unit
, Empty
);
5196 -- Build the subprogram declaration, which does not appear in the
5197 -- generic template, and give it a sloc consistent with that of the
5200 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5201 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5203 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5204 Specification
=> Act_Spec
);
5206 -- The aspects have been copied previously, but they have to be
5207 -- linked explicitly to the new subprogram declaration. Explicit
5208 -- pre/postconditions on the instance are analyzed below, in a
5211 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5212 Set_Categorization_From_Pragmas
(Act_Decl
);
5214 if Parent_Installed
then
5218 Append
(Act_Decl
, Renaming_List
);
5219 Analyze_Instance_And_Renamings
;
5221 -- If the generic is marked Import (Intrinsic), then so is the
5222 -- instance. This indicates that there is no body to instantiate. If
5223 -- generic is marked inline, so it the instance, and the anonymous
5224 -- subprogram it renames. If inlined, or else if inlining is enabled
5225 -- for the compilation, we generate the instance body even if it is
5226 -- not within the main unit.
5228 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5229 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5230 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5232 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5233 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5237 -- Inherit convention from generic unit. Intrinsic convention, as for
5238 -- an instance of unchecked conversion, is not inherited because an
5239 -- explicit Ada instance has been created.
5241 if Has_Convention_Pragma
(Gen_Unit
)
5242 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5244 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5245 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5248 Generate_Definition
(Act_Decl_Id
);
5249 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
5251 Set_Contract
(Act_Decl_Id
, Make_Contract
(Sloc
(Act_Decl_Id
)));
5253 -- Inherit all inlining-related flags which apply to the generic in
5254 -- the subprogram and its declaration.
5256 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5257 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5259 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5260 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5262 Set_Has_Pragma_Inline_Always
5263 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5264 Set_Has_Pragma_Inline_Always
5265 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5267 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
5268 Check_Elab_Instantiation
(N
);
5271 if Is_Dispatching_Operation
(Act_Decl_Id
)
5272 and then Ada_Version
>= Ada_2005
5278 Formal
:= First_Formal
(Act_Decl_Id
);
5279 while Present
(Formal
) loop
5280 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
5281 and then Is_Controlling_Formal
(Formal
)
5282 and then not Can_Never_Be_Null
(Formal
)
5284 Error_Msg_NE
("access parameter& is controlling,",
5287 ("\corresponding parameter of & must be"
5288 & " explicitly null-excluding", N
, Gen_Id
);
5291 Next_Formal
(Formal
);
5296 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
5298 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5300 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
5301 Inherit_Context
(Gen_Decl
, N
);
5303 Restore_Private_Views
(Pack_Id
, False);
5305 -- If the context requires a full instantiation, mark node for
5306 -- subsequent construction of the body.
5308 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
5309 Check_Forward_Instantiation
(Gen_Decl
);
5311 -- The wrapper package is always delayed, because it does not
5312 -- constitute a freeze point, but to insure that the freeze
5313 -- node is placed properly, it is created directly when
5314 -- instantiating the body (otherwise the freeze node might
5315 -- appear to early for nested instantiations).
5317 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5319 -- For ASIS purposes, indicate that the wrapper package has
5320 -- replaced the instantiation node.
5322 Rewrite
(N
, Unit
(Parent
(N
)));
5323 Set_Unit
(Parent
(N
), N
);
5326 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5328 -- Replace instance node for library-level instantiations of
5329 -- intrinsic subprograms, for ASIS use.
5331 Rewrite
(N
, Unit
(Parent
(N
)));
5332 Set_Unit
(Parent
(N
), N
);
5335 if Parent_Installed
then
5339 Restore_Hidden_Primitives
(Vis_Prims_List
);
5341 Env_Installed
:= False;
5342 Generic_Renamings
.Set_Last
(0);
5343 Generic_Renamings_HTable
.Reset
;
5345 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
5346 SPARK_Mode
:= Save_SM
;
5347 SPARK_Mode_Pragma
:= Save_SMP
;
5351 if Has_Aspects
(N
) then
5352 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5356 when Instantiation_Error
=>
5357 if Parent_Installed
then
5361 if Env_Installed
then
5365 Ignore_Pragma_SPARK_Mode
:= Save_IPSM
;
5366 SPARK_Mode
:= Save_SM
;
5367 SPARK_Mode_Pragma
:= Save_SMP
;
5368 end Analyze_Subprogram_Instantiation
;
5370 -------------------------
5371 -- Get_Associated_Node --
5372 -------------------------
5374 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
5378 Assoc
:= Associated_Node
(N
);
5380 if Nkind
(Assoc
) /= Nkind
(N
) then
5383 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
5387 -- If the node is part of an inner generic, it may itself have been
5388 -- remapped into a further generic copy. Associated_Node is otherwise
5389 -- used for the entity of the node, and will be of a different node
5390 -- kind, or else N has been rewritten as a literal or function call.
5392 while Present
(Associated_Node
(Assoc
))
5393 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
5395 Assoc
:= Associated_Node
(Assoc
);
5398 -- Follow and additional link in case the final node was rewritten.
5399 -- This can only happen with nested generic units.
5401 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
5402 and then Present
(Associated_Node
(Assoc
))
5403 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
5404 N_Explicit_Dereference
,
5409 Assoc
:= Associated_Node
(Assoc
);
5412 -- An additional special case: an unconstrained type in an object
5413 -- declaration may have been rewritten as a local subtype constrained
5414 -- by the expression in the declaration. We need to recover the
5415 -- original entity which may be global.
5417 if Present
(Original_Node
(Assoc
))
5418 and then Nkind
(Parent
(N
)) = N_Object_Declaration
5420 Assoc
:= Original_Node
(Assoc
);
5425 end Get_Associated_Node
;
5427 -------------------------------------------
5428 -- Build_Instance_Compilation_Unit_Nodes --
5429 -------------------------------------------
5431 procedure Build_Instance_Compilation_Unit_Nodes
5436 Decl_Cunit
: Node_Id
;
5437 Body_Cunit
: Node_Id
;
5439 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
5440 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
5443 -- A new compilation unit node is built for the instance declaration
5446 Make_Compilation_Unit
(Sloc
(N
),
5447 Context_Items
=> Empty_List
,
5449 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
5451 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
5453 -- The new compilation unit is linked to its body, but both share the
5454 -- same file, so we do not set Body_Required on the new unit so as not
5455 -- to create a spurious dependency on a non-existent body in the ali.
5456 -- This simplifies CodePeer unit traversal.
5458 -- We use the original instantiation compilation unit as the resulting
5459 -- compilation unit of the instance, since this is the main unit.
5461 Rewrite
(N
, Act_Body
);
5463 -- Propagate the aspect specifications from the package body template to
5464 -- the instantiated version of the package body.
5466 if Has_Aspects
(Act_Body
) then
5467 Set_Aspect_Specifications
5468 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
5471 Body_Cunit
:= Parent
(N
);
5473 -- The two compilation unit nodes are linked by the Library_Unit field
5475 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
5476 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
5478 -- Preserve the private nature of the package if needed
5480 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
5482 -- If the instance is not the main unit, its context, categorization
5483 -- and elaboration entity are not relevant to the compilation.
5485 if Body_Cunit
/= Cunit
(Main_Unit
) then
5486 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
5490 -- The context clause items on the instantiation, which are now attached
5491 -- to the body compilation unit (since the body overwrote the original
5492 -- instantiation node), semantically belong on the spec, so copy them
5493 -- there. It's harmless to leave them on the body as well. In fact one
5494 -- could argue that they belong in both places.
5496 Citem
:= First
(Context_Items
(Body_Cunit
));
5497 while Present
(Citem
) loop
5498 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
5502 -- Propagate categorization flags on packages, so that they appear in
5503 -- the ali file for the spec of the unit.
5505 if Ekind
(New_Main
) = E_Package
then
5506 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
5507 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
5508 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
5509 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
5510 Set_Is_Remote_Call_Interface
5511 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
5514 -- Make entry in Units table, so that binder can generate call to
5515 -- elaboration procedure for body, if any.
5517 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
5518 Main_Unit_Entity
:= New_Main
;
5519 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
5521 -- Build elaboration entity, since the instance may certainly generate
5522 -- elaboration code requiring a flag for protection.
5524 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
5525 end Build_Instance_Compilation_Unit_Nodes
;
5527 -----------------------------
5528 -- Check_Access_Definition --
5529 -----------------------------
5531 procedure Check_Access_Definition
(N
: Node_Id
) is
5534 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
5536 end Check_Access_Definition
;
5538 -----------------------------------
5539 -- Check_Formal_Package_Instance --
5540 -----------------------------------
5542 -- If the formal has specific parameters, they must match those of the
5543 -- actual. Both of them are instances, and the renaming declarations for
5544 -- their formal parameters appear in the same order in both. The analyzed
5545 -- formal has been analyzed in the context of the current instance.
5547 procedure Check_Formal_Package_Instance
5548 (Formal_Pack
: Entity_Id
;
5549 Actual_Pack
: Entity_Id
)
5551 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
5552 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
5557 procedure Check_Mismatch
(B
: Boolean);
5558 -- Common error routine for mismatch between the parameters of the
5559 -- actual instance and those of the formal package.
5561 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
5562 -- The formal may come from a nested formal package, and the actual may
5563 -- have been constant-folded. To determine whether the two denote the
5564 -- same entity we may have to traverse several definitions to recover
5565 -- the ultimate entity that they refer to.
5567 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
5568 -- Similarly, if the formal comes from a nested formal package, the
5569 -- actual may designate the formal through multiple renamings, which
5570 -- have to be followed to determine the original variable in question.
5572 --------------------
5573 -- Check_Mismatch --
5574 --------------------
5576 procedure Check_Mismatch
(B
: Boolean) is
5577 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
5580 if Kind
= N_Formal_Type_Declaration
then
5583 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
5584 N_Formal_Package_Declaration
)
5585 or else Kind
in N_Formal_Subprogram_Declaration
5591 ("actual for & in actual instance does not match formal",
5592 Parent
(Actual_Pack
), E1
);
5596 --------------------------------
5597 -- Same_Instantiated_Constant --
5598 --------------------------------
5600 function Same_Instantiated_Constant
5601 (E1
, E2
: Entity_Id
) return Boolean
5607 while Present
(Ent
) loop
5611 elsif Ekind
(Ent
) /= E_Constant
then
5614 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
5615 if Entity
(Constant_Value
(Ent
)) = E1
then
5618 Ent
:= Entity
(Constant_Value
(Ent
));
5621 -- The actual may be a constant that has been folded. Recover
5624 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
5625 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
5632 end Same_Instantiated_Constant
;
5634 --------------------------------
5635 -- Same_Instantiated_Variable --
5636 --------------------------------
5638 function Same_Instantiated_Variable
5639 (E1
, E2
: Entity_Id
) return Boolean
5641 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
5642 -- Follow chain of renamings to the ultimate ancestor
5644 ---------------------
5645 -- Original_Entity --
5646 ---------------------
5648 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
5653 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
5654 and then Present
(Renamed_Object
(Orig
))
5655 and then Is_Entity_Name
(Renamed_Object
(Orig
))
5657 Orig
:= Entity
(Renamed_Object
(Orig
));
5661 end Original_Entity
;
5663 -- Start of processing for Same_Instantiated_Variable
5666 return Ekind
(E1
) = Ekind
(E2
)
5667 and then Original_Entity
(E1
) = Original_Entity
(E2
);
5668 end Same_Instantiated_Variable
;
5670 -- Start of processing for Check_Formal_Package_Instance
5674 and then Present
(E2
)
5676 exit when Ekind
(E1
) = E_Package
5677 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
5679 -- If the formal is the renaming of the formal package, this
5680 -- is the end of its formal part, which may occur before the
5681 -- end of the formal part in the actual in the presence of
5682 -- defaulted parameters in the formal package.
5684 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
5685 and then Renamed_Entity
(E2
) = Scope
(E2
);
5687 -- The analysis of the actual may generate additional internal
5688 -- entities. If the formal is defaulted, there is no corresponding
5689 -- analysis and the internal entities must be skipped, until we
5690 -- find corresponding entities again.
5692 if Comes_From_Source
(E2
)
5693 and then not Comes_From_Source
(E1
)
5694 and then Chars
(E1
) /= Chars
(E2
)
5697 and then Chars
(E1
) /= Chars
(E2
)
5706 -- If the formal entity comes from a formal declaration, it was
5707 -- defaulted in the formal package, and no check is needed on it.
5709 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
5712 -- Ditto for defaulted formal subprograms.
5714 elsif Is_Overloadable
(E1
)
5715 and then Nkind
(Unit_Declaration_Node
(E2
)) in
5716 N_Formal_Subprogram_Declaration
5720 elsif Is_Type
(E1
) then
5722 -- Subtypes must statically match. E1, E2 are the local entities
5723 -- that are subtypes of the actuals. Itypes generated for other
5724 -- parameters need not be checked, the check will be performed
5725 -- on the parameters themselves.
5727 -- If E2 is a formal type declaration, it is a defaulted parameter
5728 -- and needs no checking.
5730 if not Is_Itype
(E1
)
5731 and then not Is_Itype
(E2
)
5735 or else Etype
(E1
) /= Etype
(E2
)
5736 or else not Subtypes_Statically_Match
(E1
, E2
));
5739 elsif Ekind
(E1
) = E_Constant
then
5741 -- IN parameters must denote the same static value, or the same
5742 -- constant, or the literal null.
5744 Expr1
:= Expression
(Parent
(E1
));
5746 if Ekind
(E2
) /= E_Constant
then
5747 Check_Mismatch
(True);
5750 Expr2
:= Expression
(Parent
(E2
));
5753 if Is_OK_Static_Expression
(Expr1
) then
5754 if not Is_OK_Static_Expression
(Expr2
) then
5755 Check_Mismatch
(True);
5757 elsif Is_Discrete_Type
(Etype
(E1
)) then
5759 V1
: constant Uint
:= Expr_Value
(Expr1
);
5760 V2
: constant Uint
:= Expr_Value
(Expr2
);
5762 Check_Mismatch
(V1
/= V2
);
5765 elsif Is_Real_Type
(Etype
(E1
)) then
5767 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
5768 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
5770 Check_Mismatch
(V1
/= V2
);
5773 elsif Is_String_Type
(Etype
(E1
))
5774 and then Nkind
(Expr1
) = N_String_Literal
5776 if Nkind
(Expr2
) /= N_String_Literal
then
5777 Check_Mismatch
(True);
5780 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
5784 elsif Is_Entity_Name
(Expr1
) then
5785 if Is_Entity_Name
(Expr2
) then
5786 if Entity
(Expr1
) = Entity
(Expr2
) then
5790 (not Same_Instantiated_Constant
5791 (Entity
(Expr1
), Entity
(Expr2
)));
5794 Check_Mismatch
(True);
5797 elsif Is_Entity_Name
(Original_Node
(Expr1
))
5798 and then Is_Entity_Name
(Expr2
)
5800 Same_Instantiated_Constant
5801 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
5805 elsif Nkind
(Expr1
) = N_Null
then
5806 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
5809 Check_Mismatch
(True);
5812 elsif Ekind
(E1
) = E_Variable
then
5813 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
5815 elsif Ekind
(E1
) = E_Package
then
5817 (Ekind
(E1
) /= Ekind
(E2
)
5818 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
5820 elsif Is_Overloadable
(E1
) then
5822 -- Verify that the actual subprograms match. Note that actuals
5823 -- that are attributes are rewritten as subprograms. If the
5824 -- subprogram in the formal package is defaulted, no check is
5825 -- needed. Note that this can only happen in Ada 2005 when the
5826 -- formal package can be partially parameterized.
5828 if Nkind
(Unit_Declaration_Node
(E1
)) =
5829 N_Subprogram_Renaming_Declaration
5830 and then From_Default
(Unit_Declaration_Node
(E1
))
5834 -- If the formal package has an "others" box association that
5835 -- covers this formal, there is no need for a check either.
5837 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
5838 N_Formal_Subprogram_Declaration
5839 and then Box_Present
(Unit_Declaration_Node
(E2
))
5843 -- No check needed if subprogram is a defaulted null procedure
5845 elsif No
(Alias
(E2
))
5846 and then Ekind
(E2
) = E_Procedure
5848 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
5852 -- Otherwise the actual in the formal and the actual in the
5853 -- instantiation of the formal must match, up to renamings.
5857 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
5861 raise Program_Error
;
5868 end Check_Formal_Package_Instance
;
5870 ---------------------------
5871 -- Check_Formal_Packages --
5872 ---------------------------
5874 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
5876 Formal_P
: Entity_Id
;
5879 -- Iterate through the declarations in the instance, looking for package
5880 -- renaming declarations that denote instances of formal packages. Stop
5881 -- when we find the renaming of the current package itself. The
5882 -- declaration for a formal package without a box is followed by an
5883 -- internal entity that repeats the instantiation.
5885 E
:= First_Entity
(P_Id
);
5886 while Present
(E
) loop
5887 if Ekind
(E
) = E_Package
then
5888 if Renamed_Object
(E
) = P_Id
then
5891 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
5894 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
5895 Formal_P
:= Next_Entity
(E
);
5896 Check_Formal_Package_Instance
(Formal_P
, E
);
5898 -- After checking, remove the internal validating package. It
5899 -- is only needed for semantic checks, and as it may contain
5900 -- generic formal declarations it should not reach gigi.
5902 Remove
(Unit_Declaration_Node
(Formal_P
));
5908 end Check_Formal_Packages
;
5910 ---------------------------------
5911 -- Check_Forward_Instantiation --
5912 ---------------------------------
5914 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
5916 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
5919 -- The instantiation appears before the generic body if we are in the
5920 -- scope of the unit containing the generic, either in its spec or in
5921 -- the package body, and before the generic body.
5923 if Ekind
(Gen_Comp
) = E_Package_Body
then
5924 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
5927 if In_Open_Scopes
(Gen_Comp
)
5928 and then No
(Corresponding_Body
(Decl
))
5933 and then not Is_Compilation_Unit
(S
)
5934 and then not Is_Child_Unit
(S
)
5936 if Ekind
(S
) = E_Package
then
5937 Set_Has_Forward_Instantiation
(S
);
5943 end Check_Forward_Instantiation
;
5945 ---------------------------
5946 -- Check_Generic_Actuals --
5947 ---------------------------
5949 -- The visibility of the actuals may be different between the point of
5950 -- generic instantiation and the instantiation of the body.
5952 procedure Check_Generic_Actuals
5953 (Instance
: Entity_Id
;
5954 Is_Formal_Box
: Boolean)
5959 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
5960 -- For a formal that is an array type, the component type is often a
5961 -- previous formal in the same unit. The privacy status of the component
5962 -- type will have been examined earlier in the traversal of the
5963 -- corresponding actuals, and this status should not be modified for
5964 -- the array (sub)type itself. However, if the base type of the array
5965 -- (sub)type is private, its full view must be restored in the body to
5966 -- be consistent with subsequent index subtypes, etc.
5968 -- To detect this case we have to rescan the list of formals, which is
5969 -- usually short enough to ignore the resulting inefficiency.
5971 -----------------------------
5972 -- Denotes_Previous_Actual --
5973 -----------------------------
5975 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
5979 Prev
:= First_Entity
(Instance
);
5980 while Present
(Prev
) loop
5982 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
5983 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
5984 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
5997 end Denotes_Previous_Actual
;
5999 -- Start of processing for Check_Generic_Actuals
6002 E
:= First_Entity
(Instance
);
6003 while Present
(E
) loop
6005 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
6006 and then Scope
(Etype
(E
)) /= Instance
6007 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
6009 if Is_Array_Type
(E
)
6010 and then not Is_Private_Type
(Etype
(E
))
6011 and then Denotes_Previous_Actual
(Component_Type
(E
))
6015 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
6018 Set_Is_Generic_Actual_Type
(E
, True);
6019 Set_Is_Hidden
(E
, False);
6020 Set_Is_Potentially_Use_Visible
(E
,
6023 -- We constructed the generic actual type as a subtype of the
6024 -- supplied type. This means that it normally would not inherit
6025 -- subtype specific attributes of the actual, which is wrong for
6026 -- the generic case.
6028 Astype
:= Ancestor_Subtype
(E
);
6032 -- This can happen when E is an itype that is the full view of
6033 -- a private type completed, e.g. with a constrained array. In
6034 -- that case, use the first subtype, which will carry size
6035 -- information. The base type itself is unconstrained and will
6038 Astype
:= First_Subtype
(E
);
6041 Set_Size_Info
(E
, (Astype
));
6042 Set_RM_Size
(E
, RM_Size
(Astype
));
6043 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
6045 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
6046 Set_RM_Size
(E
, RM_Size
(Astype
));
6048 -- In nested instances, the base type of an access actual may
6049 -- itself be private, and need to be exchanged.
6051 elsif Is_Access_Type
(E
)
6052 and then Is_Private_Type
(Etype
(E
))
6055 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
6058 elsif Ekind
(E
) = E_Package
then
6060 -- If this is the renaming for the current instance, we're done.
6061 -- Otherwise it is a formal package. If the corresponding formal
6062 -- was declared with a box, the (instantiations of the) generic
6063 -- formal part are also visible. Otherwise, ignore the entity
6064 -- created to validate the actuals.
6066 if Renamed_Object
(E
) = Instance
then
6069 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6072 -- The visibility of a formal of an enclosing generic is already
6075 elsif Denotes_Formal_Package
(E
) then
6078 elsif Present
(Associated_Formal_Package
(E
))
6079 and then not Is_Generic_Formal
(E
)
6081 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
6082 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6085 Check_Generic_Actuals
(Renamed_Object
(E
), False);
6088 Set_Is_Hidden
(E
, False);
6091 -- If this is a subprogram instance (in a wrapper package) the
6092 -- actual is fully visible.
6094 elsif Is_Wrapper_Package
(Instance
) then
6095 Set_Is_Hidden
(E
, False);
6097 -- If the formal package is declared with a box, or if the formal
6098 -- parameter is defaulted, it is visible in the body.
6100 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
6101 Set_Is_Hidden
(E
, False);
6104 if Ekind
(E
) = E_Constant
then
6106 -- If the type of the actual is a private type declared in the
6107 -- enclosing scope of the generic unit, the body of the generic
6108 -- sees the full view of the type (because it has to appear in
6109 -- the corresponding package body). If the type is private now,
6110 -- exchange views to restore the proper visiblity in the instance.
6113 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
6114 -- The type of the actual
6119 Parent_Scope
: Entity_Id
;
6120 -- The enclosing scope of the generic unit
6123 if Is_Wrapper_Package
(Instance
) then
6127 (Unit_Declaration_Node
6128 (Related_Instance
(Instance
))));
6131 Generic_Parent
(Package_Specification
(Instance
));
6134 Parent_Scope
:= Scope
(Gen_Id
);
6136 -- The exchange is only needed if the generic is defined
6137 -- within a package which is not a common ancestor of the
6138 -- scope of the instance, and is not already in scope.
6140 if Is_Private_Type
(Typ
)
6141 and then Scope
(Typ
) = Parent_Scope
6142 and then Scope
(Instance
) /= Parent_Scope
6143 and then Ekind
(Parent_Scope
) = E_Package
6144 and then not Is_Child_Unit
(Gen_Id
)
6148 -- If the type of the entity is a subtype, it may also have
6149 -- to be made visible, together with the base type of its
6150 -- full view, after exchange.
6152 if Is_Private_Type
(Etype
(E
)) then
6153 Switch_View
(Etype
(E
));
6154 Switch_View
(Base_Type
(Etype
(E
)));
6162 end Check_Generic_Actuals
;
6164 ------------------------------
6165 -- Check_Generic_Child_Unit --
6166 ------------------------------
6168 procedure Check_Generic_Child_Unit
6170 Parent_Installed
: in out Boolean)
6172 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
6173 Gen_Par
: Entity_Id
:= Empty
;
6175 Inst_Par
: Entity_Id
;
6178 function Find_Generic_Child
6180 Id
: Node_Id
) return Entity_Id
;
6181 -- Search generic parent for possible child unit with the given name
6183 function In_Enclosing_Instance
return Boolean;
6184 -- Within an instance of the parent, the child unit may be denoted by
6185 -- a simple name, or an abbreviated expanded name. Examine enclosing
6186 -- scopes to locate a possible parent instantiation.
6188 ------------------------
6189 -- Find_Generic_Child --
6190 ------------------------
6192 function Find_Generic_Child
6194 Id
: Node_Id
) return Entity_Id
6199 -- If entity of name is already set, instance has already been
6200 -- resolved, e.g. in an enclosing instantiation.
6202 if Present
(Entity
(Id
)) then
6203 if Scope
(Entity
(Id
)) = Scop
then
6210 E
:= First_Entity
(Scop
);
6211 while Present
(E
) loop
6212 if Chars
(E
) = Chars
(Id
)
6213 and then Is_Child_Unit
(E
)
6215 if Is_Child_Unit
(E
)
6216 and then not Is_Visible_Lib_Unit
(E
)
6219 ("generic child unit& is not visible", Gen_Id
, E
);
6231 end Find_Generic_Child
;
6233 ---------------------------
6234 -- In_Enclosing_Instance --
6235 ---------------------------
6237 function In_Enclosing_Instance
return Boolean is
6238 Enclosing_Instance
: Node_Id
;
6239 Instance_Decl
: Node_Id
;
6242 -- We do not inline any call that contains instantiations, except
6243 -- for instantiations of Unchecked_Conversion, so if we are within
6244 -- an inlined body the current instance does not require parents.
6246 if In_Inlined_Body
then
6247 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
6251 -- Loop to check enclosing scopes
6253 Enclosing_Instance
:= Current_Scope
;
6254 while Present
(Enclosing_Instance
) loop
6255 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
6257 if Ekind
(Enclosing_Instance
) = E_Package
6258 and then Is_Generic_Instance
(Enclosing_Instance
)
6260 (Generic_Parent
(Specification
(Instance_Decl
)))
6262 -- Check whether the generic we are looking for is a child of
6265 E
:= Find_Generic_Child
6266 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
6267 exit when Present
(E
);
6273 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
6285 Make_Expanded_Name
(Loc
,
6287 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
6288 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
6290 Set_Entity
(Gen_Id
, E
);
6291 Set_Etype
(Gen_Id
, Etype
(E
));
6292 Parent_Installed
:= False; -- Already in scope.
6295 end In_Enclosing_Instance
;
6297 -- Start of processing for Check_Generic_Child_Unit
6300 -- If the name of the generic is given by a selected component, it may
6301 -- be the name of a generic child unit, and the prefix is the name of an
6302 -- instance of the parent, in which case the child unit must be visible.
6303 -- If this instance is not in scope, it must be placed there and removed
6304 -- after instantiation, because what is being instantiated is not the
6305 -- original child, but the corresponding child present in the instance
6308 -- If the child is instantiated within the parent, it can be given by
6309 -- a simple name. In this case the instance is already in scope, but
6310 -- the child generic must be recovered from the generic parent as well.
6312 if Nkind
(Gen_Id
) = N_Selected_Component
then
6313 S
:= Selector_Name
(Gen_Id
);
6314 Analyze
(Prefix
(Gen_Id
));
6315 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6317 if Ekind
(Inst_Par
) = E_Package
6318 and then Present
(Renamed_Object
(Inst_Par
))
6320 Inst_Par
:= Renamed_Object
(Inst_Par
);
6323 if Ekind
(Inst_Par
) = E_Package
then
6324 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
6325 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
6327 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
6329 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
6331 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
6334 elsif Ekind
(Inst_Par
) = E_Generic_Package
6335 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
6337 -- A formal package may be a real child package, and not the
6338 -- implicit instance within a parent. In this case the child is
6339 -- not visible and has to be retrieved explicitly as well.
6341 Gen_Par
:= Inst_Par
;
6344 if Present
(Gen_Par
) then
6346 -- The prefix denotes an instantiation. The entity itself may be a
6347 -- nested generic, or a child unit.
6349 E
:= Find_Generic_Child
(Gen_Par
, S
);
6352 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
6353 Set_Entity
(Gen_Id
, E
);
6354 Set_Etype
(Gen_Id
, Etype
(E
));
6356 Set_Etype
(S
, Etype
(E
));
6358 -- Indicate that this is a reference to the parent
6360 if In_Extended_Main_Source_Unit
(Gen_Id
) then
6361 Set_Is_Instantiated
(Inst_Par
);
6364 -- A common mistake is to replicate the naming scheme of a
6365 -- hierarchy by instantiating a generic child directly, rather
6366 -- than the implicit child in a parent instance:
6368 -- generic .. package Gpar is ..
6369 -- generic .. package Gpar.Child is ..
6370 -- package Par is new Gpar ();
6373 -- package Par.Child is new Gpar.Child ();
6374 -- rather than Par.Child
6376 -- In this case the instantiation is within Par, which is an
6377 -- instance, but Gpar does not denote Par because we are not IN
6378 -- the instance of Gpar, so this is illegal. The test below
6379 -- recognizes this particular case.
6381 if Is_Child_Unit
(E
)
6382 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
6383 and then (not In_Instance
6384 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
6388 ("prefix of generic child unit must be instance of parent",
6392 if not In_Open_Scopes
(Inst_Par
)
6393 and then Nkind
(Parent
(Gen_Id
)) not in
6394 N_Generic_Renaming_Declaration
6396 Install_Parent
(Inst_Par
);
6397 Parent_Installed
:= True;
6399 elsif In_Open_Scopes
(Inst_Par
) then
6401 -- If the parent is already installed, install the actuals
6402 -- for its formal packages. This is necessary when the child
6403 -- instance is a child of the parent instance: in this case,
6404 -- the parent is placed on the scope stack but the formal
6405 -- packages are not made visible.
6407 Install_Formal_Packages
(Inst_Par
);
6411 -- If the generic parent does not contain an entity that
6412 -- corresponds to the selector, the instance doesn't either.
6413 -- Analyzing the node will yield the appropriate error message.
6414 -- If the entity is not a child unit, then it is an inner
6415 -- generic in the parent.
6423 if Is_Child_Unit
(Entity
(Gen_Id
))
6425 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6426 and then not In_Open_Scopes
(Inst_Par
)
6428 Install_Parent
(Inst_Par
);
6429 Parent_Installed
:= True;
6431 -- The generic unit may be the renaming of the implicit child
6432 -- present in an instance. In that case the parent instance is
6433 -- obtained from the name of the renamed entity.
6435 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
6436 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
6437 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
6440 Renamed_Package
: constant Node_Id
:=
6441 Name
(Parent
(Entity
(Gen_Id
)));
6443 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
6444 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
6445 Install_Parent
(Inst_Par
);
6446 Parent_Installed
:= True;
6452 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
6454 -- Entity already present, analyze prefix, whose meaning may be
6455 -- an instance in the current context. If it is an instance of
6456 -- a relative within another, the proper parent may still have
6457 -- to be installed, if they are not of the same generation.
6459 Analyze
(Prefix
(Gen_Id
));
6461 -- In the unlikely case that a local declaration hides the name
6462 -- of the parent package, locate it on the homonym chain. If the
6463 -- context is an instance of the parent, the renaming entity is
6466 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6467 while Present
(Inst_Par
)
6468 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
6470 Inst_Par
:= Homonym
(Inst_Par
);
6473 pragma Assert
(Present
(Inst_Par
));
6474 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
6476 if In_Enclosing_Instance
then
6479 elsif Present
(Entity
(Gen_Id
))
6480 and then Is_Child_Unit
(Entity
(Gen_Id
))
6481 and then not In_Open_Scopes
(Inst_Par
)
6483 Install_Parent
(Inst_Par
);
6484 Parent_Installed
:= True;
6487 elsif In_Enclosing_Instance
then
6489 -- The child unit is found in some enclosing scope
6496 -- If this is the renaming of the implicit child in a parent
6497 -- instance, recover the parent name and install it.
6499 if Is_Entity_Name
(Gen_Id
) then
6500 E
:= Entity
(Gen_Id
);
6502 if Is_Generic_Unit
(E
)
6503 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
6504 and then Is_Child_Unit
(Renamed_Object
(E
))
6505 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
6506 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
6509 New_Copy_Tree
(Name
(Parent
(E
))));
6510 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
6512 if not In_Open_Scopes
(Inst_Par
) then
6513 Install_Parent
(Inst_Par
);
6514 Parent_Installed
:= True;
6517 -- If it is a child unit of a non-generic parent, it may be
6518 -- use-visible and given by a direct name. Install parent as
6521 elsif Is_Generic_Unit
(E
)
6522 and then Is_Child_Unit
(E
)
6524 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
6525 and then not Is_Generic_Unit
(Scope
(E
))
6527 if not In_Open_Scopes
(Scope
(E
)) then
6528 Install_Parent
(Scope
(E
));
6529 Parent_Installed
:= True;
6534 end Check_Generic_Child_Unit
;
6536 -----------------------------
6537 -- Check_Hidden_Child_Unit --
6538 -----------------------------
6540 procedure Check_Hidden_Child_Unit
6542 Gen_Unit
: Entity_Id
;
6543 Act_Decl_Id
: Entity_Id
)
6545 Gen_Id
: constant Node_Id
:= Name
(N
);
6548 if Is_Child_Unit
(Gen_Unit
)
6549 and then Is_Child_Unit
(Act_Decl_Id
)
6550 and then Nkind
(Gen_Id
) = N_Expanded_Name
6551 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
6552 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
6554 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
6556 ("generic unit & is implicitly declared in &",
6557 Defining_Unit_Name
(N
), Gen_Unit
);
6558 Error_Msg_N
("\instance must have different name",
6559 Defining_Unit_Name
(N
));
6561 end Check_Hidden_Child_Unit
;
6563 ------------------------
6564 -- Check_Private_View --
6565 ------------------------
6567 procedure Check_Private_View
(N
: Node_Id
) is
6568 T
: constant Entity_Id
:= Etype
(N
);
6572 -- Exchange views if the type was not private in the generic but is
6573 -- private at the point of instantiation. Do not exchange views if
6574 -- the scope of the type is in scope. This can happen if both generic
6575 -- and instance are sibling units, or if type is defined in a parent.
6576 -- In this case the visibility of the type will be correct for all
6580 BT
:= Base_Type
(T
);
6582 if Is_Private_Type
(T
)
6583 and then not Has_Private_View
(N
)
6584 and then Present
(Full_View
(T
))
6585 and then not In_Open_Scopes
(Scope
(T
))
6587 -- In the generic, the full type was visible. Save the private
6588 -- entity, for subsequent exchange.
6592 elsif Has_Private_View
(N
)
6593 and then not Is_Private_Type
(T
)
6594 and then not Has_Been_Exchanged
(T
)
6595 and then Etype
(Get_Associated_Node
(N
)) /= T
6597 -- Only the private declaration was visible in the generic. If
6598 -- the type appears in a subtype declaration, the subtype in the
6599 -- instance must have a view compatible with that of its parent,
6600 -- which must be exchanged (see corresponding code in Restore_
6601 -- Private_Views). Otherwise, if the type is defined in a parent
6602 -- unit, leave full visibility within instance, which is safe.
6604 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
6605 and then not Is_Private_Type
(Base_Type
(T
))
6606 and then Comes_From_Source
(Base_Type
(T
))
6610 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
6611 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
6613 Prepend_Elmt
(T
, Exchanged_Views
);
6614 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
6617 -- For composite types with inconsistent representation exchange
6618 -- component types accordingly.
6620 elsif Is_Access_Type
(T
)
6621 and then Is_Private_Type
(Designated_Type
(T
))
6622 and then not Has_Private_View
(N
)
6623 and then Present
(Full_View
(Designated_Type
(T
)))
6625 Switch_View
(Designated_Type
(T
));
6627 elsif Is_Array_Type
(T
) then
6628 if Is_Private_Type
(Component_Type
(T
))
6629 and then not Has_Private_View
(N
)
6630 and then Present
(Full_View
(Component_Type
(T
)))
6632 Switch_View
(Component_Type
(T
));
6635 -- The normal exchange mechanism relies on the setting of a
6636 -- flag on the reference in the generic. However, an additional
6637 -- mechanism is needed for types that are not explicitly
6638 -- mentioned in the generic, but may be needed in expanded code
6639 -- in the instance. This includes component types of arrays and
6640 -- designated types of access types. This processing must also
6641 -- include the index types of arrays which we take care of here.
6648 Indx
:= First_Index
(T
);
6649 while Present
(Indx
) loop
6650 Typ
:= Base_Type
(Etype
(Indx
));
6652 if Is_Private_Type
(Typ
)
6653 and then Present
(Full_View
(Typ
))
6662 elsif Is_Private_Type
(T
)
6663 and then Present
(Full_View
(T
))
6664 and then Is_Array_Type
(Full_View
(T
))
6665 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
6669 -- Finally, a non-private subtype may have a private base type, which
6670 -- must be exchanged for consistency. This can happen when a package
6671 -- body is instantiated, when the scope stack is empty but in fact
6672 -- the subtype and the base type are declared in an enclosing scope.
6674 -- Note that in this case we introduce an inconsistency in the view
6675 -- set, because we switch the base type BT, but there could be some
6676 -- private dependent subtypes of BT which remain unswitched. Such
6677 -- subtypes might need to be switched at a later point (see specific
6678 -- provision for that case in Switch_View).
6680 elsif not Is_Private_Type
(T
)
6681 and then not Has_Private_View
(N
)
6682 and then Is_Private_Type
(BT
)
6683 and then Present
(Full_View
(BT
))
6684 and then not Is_Generic_Type
(BT
)
6685 and then not In_Open_Scopes
(BT
)
6687 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
6688 Exchange_Declarations
(BT
);
6691 end Check_Private_View
;
6693 -----------------------------
6694 -- Check_Hidden_Primitives --
6695 -----------------------------
6697 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
6700 Result
: Elist_Id
:= No_Elist
;
6703 if No
(Assoc_List
) then
6707 -- Traverse the list of associations between formals and actuals
6708 -- searching for renamings of tagged types
6710 Actual
:= First
(Assoc_List
);
6711 while Present
(Actual
) loop
6712 if Nkind
(Actual
) = N_Subtype_Declaration
then
6713 Gen_T
:= Generic_Parent_Type
(Actual
);
6716 and then Is_Tagged_Type
(Gen_T
)
6718 -- Traverse the list of primitives of the actual types
6719 -- searching for hidden primitives that are visible in the
6720 -- corresponding generic formal; leave them visible and
6721 -- append them to Result to restore their decoration later.
6723 Install_Hidden_Primitives
6724 (Prims_List
=> Result
,
6726 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
6734 end Check_Hidden_Primitives
;
6736 --------------------------
6737 -- Contains_Instance_Of --
6738 --------------------------
6740 function Contains_Instance_Of
6743 N
: Node_Id
) return Boolean
6751 -- Verify that there are no circular instantiations. We check whether
6752 -- the unit contains an instance of the current scope or some enclosing
6753 -- scope (in case one of the instances appears in a subunit). Longer
6754 -- circularities involving subunits might seem too pathological to
6755 -- consider, but they were not too pathological for the authors of
6756 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6757 -- enclosing generic scopes as containing an instance.
6760 -- Within a generic subprogram body, the scope is not generic, to
6761 -- allow for recursive subprograms. Use the declaration to determine
6762 -- whether this is a generic unit.
6764 if Ekind
(Scop
) = E_Generic_Package
6765 or else (Is_Subprogram
(Scop
)
6766 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
6767 N_Generic_Subprogram_Declaration
)
6769 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
6771 while Present
(Elmt
) loop
6772 if Node
(Elmt
) = Scop
then
6773 Error_Msg_Node_2
:= Inner
;
6775 ("circular Instantiation: & instantiated within &!",
6779 elsif Node
(Elmt
) = Inner
then
6782 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
6783 Error_Msg_Node_2
:= Inner
;
6785 ("circular Instantiation: & instantiated within &!",
6793 -- Indicate that Inner is being instantiated within Scop
6795 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
6798 if Scop
= Standard_Standard
then
6801 Scop
:= Scope
(Scop
);
6806 end Contains_Instance_Of
;
6808 -----------------------
6809 -- Copy_Generic_Node --
6810 -----------------------
6812 function Copy_Generic_Node
6814 Parent_Id
: Node_Id
;
6815 Instantiating
: Boolean) return Node_Id
6820 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
6821 -- Check the given value of one of the Fields referenced by the current
6822 -- node to determine whether to copy it recursively. The field may hold
6823 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
6824 -- Char) in which case it need not be copied.
6826 procedure Copy_Descendants
;
6827 -- Common utility for various nodes
6829 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
6830 -- Make copy of element list
6832 function Copy_Generic_List
6834 Parent_Id
: Node_Id
) return List_Id
;
6835 -- Apply Copy_Node recursively to the members of a node list
6837 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
6838 -- True if an identifier is part of the defining program unit name of
6839 -- a child unit. The entity of such an identifier must be kept (for
6840 -- ASIS use) even though as the name of an enclosing generic it would
6841 -- otherwise not be preserved in the generic tree.
6843 ----------------------
6844 -- Copy_Descendants --
6845 ----------------------
6847 procedure Copy_Descendants
is
6849 use Atree
.Unchecked_Access
;
6850 -- This code section is part of the implementation of an untyped
6851 -- tree traversal, so it needs direct access to node fields.
6854 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6855 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6856 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6857 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
6858 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6859 end Copy_Descendants
;
6861 -----------------------------
6862 -- Copy_Generic_Descendant --
6863 -----------------------------
6865 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
6867 if D
= Union_Id
(Empty
) then
6870 elsif D
in Node_Range
then
6872 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
6874 elsif D
in List_Range
then
6875 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
6877 elsif D
in Elist_Range
then
6878 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
6880 -- Nothing else is copyable (e.g. Uint values), return as is
6885 end Copy_Generic_Descendant
;
6887 ------------------------
6888 -- Copy_Generic_Elist --
6889 ------------------------
6891 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
6898 M
:= First_Elmt
(E
);
6899 while Present
(M
) loop
6901 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
6910 end Copy_Generic_Elist
;
6912 -----------------------
6913 -- Copy_Generic_List --
6914 -----------------------
6916 function Copy_Generic_List
6918 Parent_Id
: Node_Id
) return List_Id
6926 Set_Parent
(New_L
, Parent_Id
);
6929 while Present
(N
) loop
6930 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
6939 end Copy_Generic_List
;
6941 ---------------------------
6942 -- In_Defining_Unit_Name --
6943 ---------------------------
6945 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
6947 return Present
(Parent
(Nam
))
6948 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
6950 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
6951 and then In_Defining_Unit_Name
(Parent
(Nam
))));
6952 end In_Defining_Unit_Name
;
6954 -- Start of processing for Copy_Generic_Node
6961 New_N
:= New_Copy
(N
);
6963 -- Copy aspects if present
6965 if Has_Aspects
(N
) then
6966 Set_Has_Aspects
(New_N
, False);
6967 Set_Aspect_Specifications
6968 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
6971 if Instantiating
then
6972 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
6975 if not Is_List_Member
(N
) then
6976 Set_Parent
(New_N
, Parent_Id
);
6979 -- If defining identifier, then all fields have been copied already
6981 if Nkind
(New_N
) in N_Entity
then
6984 -- Special casing for identifiers and other entity names and operators
6986 elsif Nkind_In
(New_N
, N_Identifier
,
6987 N_Character_Literal
,
6990 or else Nkind
(New_N
) in N_Op
6992 if not Instantiating
then
6994 -- Link both nodes in order to assign subsequently the entity of
6995 -- the copy to the original node, in case this is a global
6998 Set_Associated_Node
(N
, New_N
);
7000 -- If we are within an instantiation, this is a nested generic
7001 -- that has already been analyzed at the point of definition.
7002 -- We must preserve references that were global to the enclosing
7003 -- parent at that point. Other occurrences, whether global or
7004 -- local to the current generic, must be resolved anew, so we
7005 -- reset the entity in the generic copy. A global reference has a
7006 -- smaller depth than the parent, or else the same depth in case
7007 -- both are distinct compilation units.
7009 -- A child unit is implicitly declared within the enclosing parent
7010 -- but is in fact global to it, and must be preserved.
7012 -- It is also possible for Current_Instantiated_Parent to be
7013 -- defined, and for this not to be a nested generic, namely if
7014 -- the unit is loaded through Rtsfind. In that case, the entity of
7015 -- New_N is only a link to the associated node, and not a defining
7018 -- The entities for parent units in the defining_program_unit of a
7019 -- generic child unit are established when the context of the unit
7020 -- is first analyzed, before the generic copy is made. They are
7021 -- preserved in the copy for use in ASIS queries.
7023 Ent
:= Entity
(New_N
);
7025 if No
(Current_Instantiated_Parent
.Gen_Id
) then
7027 or else Nkind
(Ent
) /= N_Defining_Identifier
7028 or else not In_Defining_Unit_Name
(N
)
7030 Set_Associated_Node
(New_N
, Empty
);
7035 not Nkind_In
(Ent
, N_Defining_Identifier
,
7036 N_Defining_Character_Literal
,
7037 N_Defining_Operator_Symbol
)
7038 or else No
(Scope
(Ent
))
7040 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
7041 and then not Is_Child_Unit
(Ent
))
7043 (Scope_Depth
(Scope
(Ent
)) >
7044 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
7046 Get_Source_Unit
(Ent
) =
7047 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
7049 Set_Associated_Node
(New_N
, Empty
);
7052 -- Case of instantiating identifier or some other name or operator
7055 -- If the associated node is still defined, the entity in it
7056 -- is global, and must be copied to the instance. If this copy
7057 -- is being made for a body to inline, it is applied to an
7058 -- instantiated tree, and the entity is already present and
7059 -- must be also preserved.
7062 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
7065 if Present
(Assoc
) then
7066 if Nkind
(Assoc
) = Nkind
(N
) then
7067 Set_Entity
(New_N
, Entity
(Assoc
));
7068 Check_Private_View
(N
);
7070 -- The name in the call may be a selected component if the
7071 -- call has not been analyzed yet, as may be the case for
7072 -- pre/post conditions in a generic unit.
7074 elsif Nkind
(Assoc
) = N_Function_Call
7075 and then Is_Entity_Name
(Name
(Assoc
))
7077 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
7079 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
7080 N_Defining_Character_Literal
,
7081 N_Defining_Operator_Symbol
)
7082 and then Expander_Active
7084 -- Inlining case: we are copying a tree that contains
7085 -- global entities, which are preserved in the copy to be
7086 -- used for subsequent inlining.
7091 Set_Entity
(New_N
, Empty
);
7097 -- For expanded name, we must copy the Prefix and Selector_Name
7099 if Nkind
(N
) = N_Expanded_Name
then
7101 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
7103 Set_Selector_Name
(New_N
,
7104 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
7106 -- For operators, we must copy the right operand
7108 elsif Nkind
(N
) in N_Op
then
7109 Set_Right_Opnd
(New_N
,
7110 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
7112 -- And for binary operators, the left operand as well
7114 if Nkind
(N
) in N_Binary_Op
then
7115 Set_Left_Opnd
(New_N
,
7116 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
7120 -- Special casing for stubs
7122 elsif Nkind
(N
) in N_Body_Stub
then
7124 -- In any case, we must copy the specification or defining
7125 -- identifier as appropriate.
7127 if Nkind
(N
) = N_Subprogram_Body_Stub
then
7128 Set_Specification
(New_N
,
7129 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
7132 Set_Defining_Identifier
(New_N
,
7134 (Defining_Identifier
(N
), New_N
, Instantiating
));
7137 -- If we are not instantiating, then this is where we load and
7138 -- analyze subunits, i.e. at the point where the stub occurs. A
7139 -- more permissive system might defer this analysis to the point
7140 -- of instantiation, but this seems too complicated for now.
7142 if not Instantiating
then
7144 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
7146 Unum
: Unit_Number_Type
;
7150 -- Make sure that, if it is a subunit of the main unit that is
7151 -- preprocessed and if -gnateG is specified, the preprocessed
7152 -- file will be written.
7154 Lib
.Analysing_Subunit_Of_Main
:=
7155 Lib
.In_Extended_Main_Source_Unit
(N
);
7158 (Load_Name
=> Subunit_Name
,
7162 Lib
.Analysing_Subunit_Of_Main
:= False;
7164 -- If the proper body is not found, a warning message will be
7165 -- emitted when analyzing the stub, or later at the point of
7166 -- instantiation. Here we just leave the stub as is.
7168 if Unum
= No_Unit
then
7169 Subunits_Missing
:= True;
7170 goto Subunit_Not_Found
;
7173 Subunit
:= Cunit
(Unum
);
7175 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
7177 ("found child unit instead of expected SEPARATE subunit",
7179 Error_Msg_Sloc
:= Sloc
(N
);
7180 Error_Msg_N
("\to complete stub #", Subunit
);
7181 goto Subunit_Not_Found
;
7184 -- We must create a generic copy of the subunit, in order to
7185 -- perform semantic analysis on it, and we must replace the
7186 -- stub in the original generic unit with the subunit, in order
7187 -- to preserve non-local references within.
7189 -- Only the proper body needs to be copied. Library_Unit and
7190 -- context clause are simply inherited by the generic copy.
7191 -- Note that the copy (which may be recursive if there are
7192 -- nested subunits) must be done first, before attaching it to
7193 -- the enclosing generic.
7197 (Proper_Body
(Unit
(Subunit
)),
7198 Empty
, Instantiating
=> False);
7200 -- Now place the original proper body in the original generic
7201 -- unit. This is a body, not a compilation unit.
7203 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
7204 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
7205 Set_Was_Originally_Stub
(N
);
7207 -- Finally replace the body of the subunit with its copy, and
7208 -- make this new subunit into the library unit of the generic
7209 -- copy, which does not have stubs any longer.
7211 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
7212 Set_Library_Unit
(New_N
, Subunit
);
7213 Inherit_Context
(Unit
(Subunit
), N
);
7216 -- If we are instantiating, this must be an error case, since
7217 -- otherwise we would have replaced the stub node by the proper body
7218 -- that corresponds. So just ignore it in the copy (i.e. we have
7219 -- copied it, and that is good enough).
7225 <<Subunit_Not_Found
>> null;
7227 -- If the node is a compilation unit, it is the subunit of a stub, which
7228 -- has been loaded already (see code below). In this case, the library
7229 -- unit field of N points to the parent unit (which is a compilation
7230 -- unit) and need not (and cannot) be copied.
7232 -- When the proper body of the stub is analyzed, the library_unit link
7233 -- is used to establish the proper context (see sem_ch10).
7235 -- The other fields of a compilation unit are copied as usual
7237 elsif Nkind
(N
) = N_Compilation_Unit
then
7239 -- This code can only be executed when not instantiating, because in
7240 -- the copy made for an instantiation, the compilation unit node has
7241 -- disappeared at the point that a stub is replaced by its proper
7244 pragma Assert
(not Instantiating
);
7246 Set_Context_Items
(New_N
,
7247 Copy_Generic_List
(Context_Items
(N
), New_N
));
7250 Copy_Generic_Node
(Unit
(N
), New_N
, False));
7252 Set_First_Inlined_Subprogram
(New_N
,
7254 (First_Inlined_Subprogram
(N
), New_N
, False));
7256 Set_Aux_Decls_Node
(New_N
,
7257 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
7259 -- For an assignment node, the assignment is known to be semantically
7260 -- legal if we are instantiating the template. This avoids incorrect
7261 -- diagnostics in generated code.
7263 elsif Nkind
(N
) = N_Assignment_Statement
then
7265 -- Copy name and expression fields in usual manner
7268 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
7270 Set_Expression
(New_N
,
7271 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
7273 if Instantiating
then
7274 Set_Assignment_OK
(Name
(New_N
), True);
7277 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
7278 if not Instantiating
then
7279 Set_Associated_Node
(N
, New_N
);
7282 if Present
(Get_Associated_Node
(N
))
7283 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
7285 -- In the generic the aggregate has some composite type. If at
7286 -- the point of instantiation the type has a private view,
7287 -- install the full view (and that of its ancestors, if any).
7290 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
7295 and then Is_Private_Type
(T
)
7301 and then Is_Tagged_Type
(T
)
7302 and then Is_Derived_Type
(T
)
7304 Rt
:= Root_Type
(T
);
7309 if Is_Private_Type
(T
) then
7320 -- Do not copy the associated node, which points to the generic copy
7321 -- of the aggregate.
7324 use Atree
.Unchecked_Access
;
7325 -- This code section is part of the implementation of an untyped
7326 -- tree traversal, so it needs direct access to node fields.
7329 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
7330 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
7331 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
7332 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
7335 -- Allocators do not have an identifier denoting the access type, so we
7336 -- must locate it through the expression to check whether the views are
7339 elsif Nkind
(N
) = N_Allocator
7340 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
7341 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
7342 and then Instantiating
7345 T
: constant Node_Id
:=
7346 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
7352 -- Retrieve the allocator node in the generic copy
7354 Acc_T
:= Etype
(Parent
(Parent
(T
)));
7356 and then Is_Private_Type
(Acc_T
)
7358 Switch_View
(Acc_T
);
7365 -- For a proper body, we must catch the case of a proper body that
7366 -- replaces a stub. This represents the point at which a separate
7367 -- compilation unit, and hence template file, may be referenced, so we
7368 -- must make a new source instantiation entry for the template of the
7369 -- subunit, and ensure that all nodes in the subunit are adjusted using
7370 -- this new source instantiation entry.
7372 elsif Nkind
(N
) in N_Proper_Body
then
7374 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
7377 if Instantiating
and then Was_Originally_Stub
(N
) then
7378 Create_Instantiation_Source
7379 (Instantiation_Node
,
7380 Defining_Entity
(N
),
7385 -- Now copy the fields of the proper body, using the new
7386 -- adjustment factor if one was needed as per test above.
7390 -- Restore the original adjustment factor in case changed
7392 S_Adjustment
:= Save_Adjustment
;
7395 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
7396 -- generic unit, not to the instantiating unit.
7398 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
7400 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
7402 if Prag_Id
= Pragma_Ident
or else Prag_Id
= Pragma_Comment
then
7403 New_N
:= Make_Null_Statement
(Sloc
(N
));
7409 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
7411 -- No descendant fields need traversing
7415 elsif Nkind
(N
) = N_String_Literal
7416 and then Present
(Etype
(N
))
7417 and then Instantiating
7419 -- If the string is declared in an outer scope, the string_literal
7420 -- subtype created for it may have the wrong scope. We force the
7421 -- reanalysis of the constant to generate a new itype in the proper
7424 Set_Etype
(New_N
, Empty
);
7425 Set_Analyzed
(New_N
, False);
7427 -- For the remaining nodes, copy their descendants recursively
7432 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
7433 Set_Generic_Parent
(Specification
(New_N
), N
);
7435 -- Should preserve Corresponding_Spec??? (12.3(14))
7440 end Copy_Generic_Node
;
7442 ----------------------------
7443 -- Denotes_Formal_Package --
7444 ----------------------------
7446 function Denotes_Formal_Package
7448 On_Exit
: Boolean := False;
7449 Instance
: Entity_Id
:= Empty
) return Boolean
7452 Scop
: constant Entity_Id
:= Scope
(Pack
);
7455 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
7456 -- The package in question may be an actual for a previous formal
7457 -- package P of the current instance, so examine its actuals as well.
7458 -- This must be recursive over other formal packages.
7460 ----------------------------------
7461 -- Is_Actual_Of_Previous_Formal --
7462 ----------------------------------
7464 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
7468 E1
:= First_Entity
(P
);
7469 while Present
(E1
) and then E1
/= Instance
loop
7470 if Ekind
(E1
) = E_Package
7471 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
7473 if Renamed_Object
(E1
) = Pack
then
7476 elsif E1
= P
or else Renamed_Object
(E1
) = P
then
7479 elsif Is_Actual_Of_Previous_Formal
(E1
) then
7488 end Is_Actual_Of_Previous_Formal
;
7490 -- Start of processing for Denotes_Formal_Package
7496 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
7498 Par
:= Current_Instantiated_Parent
.Act_Id
;
7501 if Ekind
(Scop
) = E_Generic_Package
7502 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
7503 N_Generic_Subprogram_Declaration
7507 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
7508 N_Formal_Package_Declaration
7516 -- Check whether this package is associated with a formal package of
7517 -- the enclosing instantiation. Iterate over the list of renamings.
7519 E
:= First_Entity
(Par
);
7520 while Present
(E
) loop
7521 if Ekind
(E
) /= E_Package
7522 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
7526 elsif Renamed_Object
(E
) = Par
then
7529 elsif Renamed_Object
(E
) = Pack
then
7532 elsif Is_Actual_Of_Previous_Formal
(E
) then
7542 end Denotes_Formal_Package
;
7548 procedure End_Generic
is
7550 -- ??? More things could be factored out in this routine. Should
7551 -- probably be done at a later stage.
7553 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
7554 Generic_Flags
.Decrement_Last
;
7556 Expander_Mode_Restore
;
7563 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
7564 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
7565 -- Find distance from given node to enclosing compilation unit
7571 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
7574 and then Nkind
(P
) /= N_Compilation_Unit
7576 P
:= True_Parent
(P
);
7581 -- Local declarations
7590 -- Start of processing for Earlier
7593 Find_Depth
(P1
, D1
);
7594 Find_Depth
(P2
, D2
);
7604 P1
:= True_Parent
(P1
);
7609 P2
:= True_Parent
(P2
);
7613 -- At this point P1 and P2 are at the same distance from the root.
7614 -- We examine their parents until we find a common declarative list.
7615 -- If we reach the root, N1 and N2 do not descend from the same
7616 -- declarative list (e.g. one is nested in the declarative part and
7617 -- the other is in a block in the statement part) and the earlier
7618 -- one is already frozen.
7620 while not Is_List_Member
(P1
)
7621 or else not Is_List_Member
(P2
)
7622 or else List_Containing
(P1
) /= List_Containing
(P2
)
7624 P1
:= True_Parent
(P1
);
7625 P2
:= True_Parent
(P2
);
7627 if Nkind
(Parent
(P1
)) = N_Subunit
then
7628 P1
:= Corresponding_Stub
(Parent
(P1
));
7631 if Nkind
(Parent
(P2
)) = N_Subunit
then
7632 P2
:= Corresponding_Stub
(Parent
(P2
));
7640 -- Expanded code usually shares the source location of the original
7641 -- construct it was generated for. This however may not necessarely
7642 -- reflect the true location of the code within the tree.
7644 -- Before comparing the slocs of the two nodes, make sure that we are
7645 -- working with correct source locations. Assume that P1 is to the left
7646 -- of P2. If either one does not come from source, traverse the common
7647 -- list heading towards the other node and locate the first source
7651 -- ----+===+===+--------------+===+===+----
7652 -- expanded code expanded code
7654 if not Comes_From_Source
(P1
) then
7655 while Present
(P1
) loop
7657 -- Neither P2 nor a source statement were located during the
7658 -- search. If we reach the end of the list, then P1 does not
7659 -- occur earlier than P2.
7662 -- start --- P2 ----- P1 --- end
7664 if No
(Next
(P1
)) then
7667 -- We encounter P2 while going to the right of the list. This
7668 -- means that P1 does indeed appear earlier.
7671 -- start --- P1 ===== P2 --- end
7672 -- expanded code in between
7677 -- No need to look any further since we have located a source
7680 elsif Comes_From_Source
(P1
) then
7690 if not Comes_From_Source
(P2
) then
7691 while Present
(P2
) loop
7693 -- Neither P1 nor a source statement were located during the
7694 -- search. If we reach the start of the list, then P1 does not
7695 -- occur earlier than P2.
7698 -- start --- P2 --- P1 --- end
7700 if No
(Prev
(P2
)) then
7703 -- We encounter P1 while going to the left of the list. This
7704 -- means that P1 does indeed appear earlier.
7707 -- start --- P1 ===== P2 --- end
7708 -- expanded code in between
7713 -- No need to look any further since we have located a source
7716 elsif Comes_From_Source
(P2
) then
7726 -- At this point either both nodes came from source or we approximated
7727 -- their source locations through neighbouring source statements.
7729 T1
:= Top_Level_Location
(Sloc
(P1
));
7730 T2
:= Top_Level_Location
(Sloc
(P2
));
7732 -- When two nodes come from the same instance, they have identical top
7733 -- level locations. To determine proper relation within the tree, check
7734 -- their locations within the template.
7737 return Sloc
(P1
) < Sloc
(P2
);
7739 -- The two nodes either come from unrelated instances or do not come
7740 -- from instantiated code at all.
7747 ----------------------
7748 -- Find_Actual_Type --
7749 ----------------------
7751 function Find_Actual_Type
7753 Gen_Type
: Entity_Id
) return Entity_Id
7755 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
7759 -- Special processing only applies to child units
7761 if not Is_Child_Unit
(Gen_Scope
) then
7762 return Get_Instance_Of
(Typ
);
7764 -- If designated or component type is itself a formal of the child unit,
7765 -- its instance is available.
7767 elsif Scope
(Typ
) = Gen_Scope
then
7768 return Get_Instance_Of
(Typ
);
7770 -- If the array or access type is not declared in the parent unit,
7771 -- no special processing needed.
7773 elsif not Is_Generic_Type
(Typ
)
7774 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
7776 return Get_Instance_Of
(Typ
);
7778 -- Otherwise, retrieve designated or component type by visibility
7781 T
:= Current_Entity
(Typ
);
7782 while Present
(T
) loop
7783 if In_Open_Scopes
(Scope
(T
)) then
7786 elsif Is_Generic_Actual_Type
(T
) then
7795 end Find_Actual_Type
;
7797 ----------------------------
7798 -- Freeze_Subprogram_Body --
7799 ----------------------------
7801 procedure Freeze_Subprogram_Body
7802 (Inst_Node
: Node_Id
;
7804 Pack_Id
: Entity_Id
)
7806 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7807 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
7813 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
7814 -- Find innermost package body that encloses the given node, and which
7815 -- is not a compilation unit. Freeze nodes for the instance, or for its
7816 -- enclosing body, may be inserted after the enclosing_body of the
7817 -- generic unit. Used to determine proper placement of freeze node for
7818 -- both package and subprogram instances.
7820 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
7821 -- Find entity for given package body, and locate or create a freeze
7824 ----------------------------
7825 -- Enclosing_Package_Body --
7826 ----------------------------
7828 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
7834 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
7836 if Nkind
(P
) = N_Package_Body
then
7837 if Nkind
(Parent
(P
)) = N_Subunit
then
7838 return Corresponding_Stub
(Parent
(P
));
7844 P
:= True_Parent
(P
);
7848 end Enclosing_Package_Body
;
7850 -------------------------
7851 -- Package_Freeze_Node --
7852 -------------------------
7854 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
7858 if Nkind
(B
) = N_Package_Body
then
7859 Id
:= Corresponding_Spec
(B
);
7860 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
7861 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
7864 Ensure_Freeze_Node
(Id
);
7865 return Freeze_Node
(Id
);
7866 end Package_Freeze_Node
;
7868 -- Start of processing of Freeze_Subprogram_Body
7871 -- If the instance and the generic body appear within the same unit, and
7872 -- the instance precedes the generic, the freeze node for the instance
7873 -- must appear after that of the generic. If the generic is nested
7874 -- within another instance I2, then current instance must be frozen
7875 -- after I2. In both cases, the freeze nodes are those of enclosing
7876 -- packages. Otherwise, the freeze node is placed at the end of the
7877 -- current declarative part.
7879 Enc_G
:= Enclosing_Package_Body
(Gen_Body
);
7880 Enc_I
:= Enclosing_Package_Body
(Inst_Node
);
7881 Ensure_Freeze_Node
(Pack_Id
);
7882 F_Node
:= Freeze_Node
(Pack_Id
);
7884 if Is_Generic_Instance
(Par
)
7885 and then Present
(Freeze_Node
(Par
))
7886 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
7888 -- The parent was a premature instantiation. Insert freeze node at
7889 -- the end the current declarative part.
7891 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
7892 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7894 -- Handle the following case:
7896 -- package Parent_Inst is new ...
7899 -- procedure P ... -- this body freezes Parent_Inst
7901 -- package Inst is new ...
7903 -- In this particular scenario, the freeze node for Inst must be
7904 -- inserted in the same manner as that of Parent_Inst - before the
7905 -- next source body or at the end of the declarative list (body not
7906 -- available). If body P did not exist and Parent_Inst was frozen
7907 -- after Inst, either by a body following Inst or at the end of the
7908 -- declarative region, the freeze node for Inst must be inserted
7909 -- after that of Parent_Inst. This relation is established by
7910 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7912 elsif List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
7913 List_Containing
(Inst_Node
)
7914 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Inst_Node
)
7916 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7919 Insert_After
(Freeze_Node
(Par
), F_Node
);
7922 -- The body enclosing the instance should be frozen after the body that
7923 -- includes the generic, because the body of the instance may make
7924 -- references to entities therein. If the two are not in the same
7925 -- declarative part, or if the one enclosing the instance is frozen
7926 -- already, freeze the instance at the end of the current declarative
7929 elsif Is_Generic_Instance
(Par
)
7930 and then Present
(Freeze_Node
(Par
))
7931 and then Present
(Enc_I
)
7933 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
7935 (Nkind
(Enc_I
) = N_Package_Body
7937 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
7939 -- The enclosing package may contain several instances. Rather
7940 -- than computing the earliest point at which to insert its freeze
7941 -- node, we place it at the end of the declarative part of the
7942 -- parent of the generic.
7944 Insert_Freeze_Node_For_Instance
7945 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
7948 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7950 elsif Present
(Enc_G
)
7951 and then Present
(Enc_I
)
7952 and then Enc_G
/= Enc_I
7953 and then Earlier
(Inst_Node
, Gen_Body
)
7955 if Nkind
(Enc_G
) = N_Package_Body
then
7956 E_G_Id
:= Corresponding_Spec
(Enc_G
);
7957 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
7959 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
7962 -- Freeze package that encloses instance, and place node after the
7963 -- package that encloses generic. If enclosing package is already
7964 -- frozen we have to assume it is at the proper place. This may be a
7965 -- potential ABE that requires dynamic checking. Do not add a freeze
7966 -- node if the package that encloses the generic is inside the body
7967 -- that encloses the instance, because the freeze node would be in
7968 -- the wrong scope. Additional contortions needed if the bodies are
7969 -- within a subunit.
7972 Enclosing_Body
: Node_Id
;
7975 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
7976 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
7978 Enclosing_Body
:= Enc_I
;
7981 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
7982 Insert_Freeze_Node_For_Instance
7983 (Enc_G
, Package_Freeze_Node
(Enc_I
));
7987 -- Freeze enclosing subunit before instance
7989 Ensure_Freeze_Node
(E_G_Id
);
7991 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
7992 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
7995 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
7998 -- If none of the above, insert freeze node at the end of the current
7999 -- declarative part.
8001 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8003 end Freeze_Subprogram_Body
;
8009 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
8011 return Generic_Renamings
.Table
(E
).Gen_Id
;
8014 ---------------------
8015 -- Get_Instance_Of --
8016 ---------------------
8018 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
8019 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
8022 if Res
/= Assoc_Null
then
8023 return Generic_Renamings
.Table
(Res
).Act_Id
;
8025 -- On exit, entity is not instantiated: not a generic parameter, or
8026 -- else parameter of an inner generic unit.
8030 end Get_Instance_Of
;
8032 ------------------------------------
8033 -- Get_Package_Instantiation_Node --
8034 ------------------------------------
8036 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
8037 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
8041 -- If the Package_Instantiation attribute has been set on the package
8042 -- entity, then use it directly when it (or its Original_Node) refers
8043 -- to an N_Package_Instantiation node. In principle it should be
8044 -- possible to have this field set in all cases, which should be
8045 -- investigated, and would allow this function to be significantly
8048 Inst
:= Package_Instantiation
(A
);
8050 if Present
(Inst
) then
8051 if Nkind
(Inst
) = N_Package_Instantiation
then
8054 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
8055 return Original_Node
(Inst
);
8059 -- If the instantiation is a compilation unit that does not need body
8060 -- then the instantiation node has been rewritten as a package
8061 -- declaration for the instance, and we return the original node.
8063 -- If it is a compilation unit and the instance node has not been
8064 -- rewritten, then it is still the unit of the compilation. Finally, if
8065 -- a body is present, this is a parent of the main unit whose body has
8066 -- been compiled for inlining purposes, and the instantiation node has
8067 -- been rewritten with the instance body.
8069 -- Otherwise the instantiation node appears after the declaration. If
8070 -- the entity is a formal package, the declaration may have been
8071 -- rewritten as a generic declaration (in the case of a formal with box)
8072 -- or left as a formal package declaration if it has actuals, and is
8073 -- found with a forward search.
8075 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
8076 if Nkind
(Decl
) = N_Package_Declaration
8077 and then Present
(Corresponding_Body
(Decl
))
8079 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
8082 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
8083 return Original_Node
(Decl
);
8085 return Unit
(Parent
(Decl
));
8088 elsif Nkind
(Decl
) = N_Package_Declaration
8089 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
8091 return Original_Node
(Decl
);
8094 Inst
:= Next
(Decl
);
8095 while not Nkind_In
(Inst
, N_Package_Instantiation
,
8096 N_Formal_Package_Declaration
)
8103 end Get_Package_Instantiation_Node
;
8105 ------------------------
8106 -- Has_Been_Exchanged --
8107 ------------------------
8109 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
8113 Next
:= First_Elmt
(Exchanged_Views
);
8114 while Present
(Next
) loop
8115 if Full_View
(Node
(Next
)) = E
then
8123 end Has_Been_Exchanged
;
8129 function Hash
(F
: Entity_Id
) return HTable_Range
is
8131 return HTable_Range
(F
mod HTable_Size
);
8134 ------------------------
8135 -- Hide_Current_Scope --
8136 ------------------------
8138 procedure Hide_Current_Scope
is
8139 C
: constant Entity_Id
:= Current_Scope
;
8143 Set_Is_Hidden_Open_Scope
(C
);
8145 E
:= First_Entity
(C
);
8146 while Present
(E
) loop
8147 if Is_Immediately_Visible
(E
) then
8148 Set_Is_Immediately_Visible
(E
, False);
8149 Append_Elmt
(E
, Hidden_Entities
);
8155 -- Make the scope name invisible as well. This is necessary, but might
8156 -- conflict with calls to Rtsfind later on, in case the scope is a
8157 -- predefined one. There is no clean solution to this problem, so for
8158 -- now we depend on the user not redefining Standard itself in one of
8159 -- the parent units.
8161 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
8162 Set_Is_Immediately_Visible
(C
, False);
8163 Append_Elmt
(C
, Hidden_Entities
);
8166 end Hide_Current_Scope
;
8172 procedure Init_Env
is
8173 Saved
: Instance_Env
;
8176 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
8177 Saved
.Exchanged_Views
:= Exchanged_Views
;
8178 Saved
.Hidden_Entities
:= Hidden_Entities
;
8179 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
8180 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
8181 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
8183 -- Save configuration switches. These may be reset if the unit is a
8184 -- predefined unit, and the current mode is not Ada 2005.
8186 Save_Opt_Config_Switches
(Saved
.Switches
);
8188 Instance_Envs
.Append
(Saved
);
8190 Exchanged_Views
:= New_Elmt_List
;
8191 Hidden_Entities
:= New_Elmt_List
;
8193 -- Make dummy entry for Instantiated parent. If generic unit is legal,
8194 -- this is set properly in Set_Instance_Env.
8196 Current_Instantiated_Parent
:=
8197 (Current_Scope
, Current_Scope
, Assoc_Null
);
8200 ------------------------------
8201 -- In_Same_Declarative_Part --
8202 ------------------------------
8204 function In_Same_Declarative_Part
8206 Inst
: Node_Id
) return Boolean
8208 Decls
: constant Node_Id
:= Parent
(F_Node
);
8209 Nod
: Node_Id
:= Parent
(Inst
);
8212 while Present
(Nod
) loop
8216 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
8218 N_Package_Declaration
,
8225 elsif Nkind
(Nod
) = N_Subunit
then
8226 Nod
:= Corresponding_Stub
(Nod
);
8228 elsif Nkind
(Nod
) = N_Compilation_Unit
then
8232 Nod
:= Parent
(Nod
);
8237 end In_Same_Declarative_Part
;
8239 ---------------------
8240 -- In_Main_Context --
8241 ---------------------
8243 function In_Main_Context
(E
: Entity_Id
) return Boolean is
8249 if not Is_Compilation_Unit
(E
)
8250 or else Ekind
(E
) /= E_Package
8251 or else In_Private_Part
(E
)
8256 Context
:= Context_Items
(Cunit
(Main_Unit
));
8258 Clause
:= First
(Context
);
8259 while Present
(Clause
) loop
8260 if Nkind
(Clause
) = N_With_Clause
then
8261 Nam
:= Name
(Clause
);
8263 -- If the current scope is part of the context of the main unit,
8264 -- analysis of the corresponding with_clause is not complete, and
8265 -- the entity is not set. We use the Chars field directly, which
8266 -- might produce false positives in rare cases, but guarantees
8267 -- that we produce all the instance bodies we will need.
8269 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
8270 or else (Nkind
(Nam
) = N_Selected_Component
8271 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
8281 end In_Main_Context
;
8283 ---------------------
8284 -- Inherit_Context --
8285 ---------------------
8287 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
8288 Current_Context
: List_Id
;
8289 Current_Unit
: Node_Id
;
8298 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
8300 -- The inherited context is attached to the enclosing compilation
8301 -- unit. This is either the main unit, or the declaration for the
8302 -- main unit (in case the instantiation appears within the package
8303 -- declaration and the main unit is its body).
8305 Current_Unit
:= Parent
(Inst
);
8306 while Present
(Current_Unit
)
8307 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8309 Current_Unit
:= Parent
(Current_Unit
);
8312 Current_Context
:= Context_Items
(Current_Unit
);
8314 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
8315 while Present
(Item
) loop
8316 if Nkind
(Item
) = N_With_Clause
then
8317 Lib_Unit
:= Library_Unit
(Item
);
8319 -- Take care to prevent direct cyclic with's
8321 if Lib_Unit
/= Current_Unit
then
8323 -- Do not add a unit if it is already in the context
8325 Clause
:= First
(Current_Context
);
8327 while Present
(Clause
) loop
8328 if Nkind
(Clause
) = N_With_Clause
and then
8329 Library_Unit
(Clause
) = Lib_Unit
8339 New_I
:= New_Copy
(Item
);
8340 Set_Implicit_With
(New_I
, True);
8341 Set_Implicit_With_From_Instantiation
(New_I
, True);
8342 Append
(New_I
, Current_Context
);
8350 end Inherit_Context
;
8356 procedure Initialize
is
8358 Generic_Renamings
.Init
;
8361 Generic_Renamings_HTable
.Reset
;
8362 Circularity_Detected
:= False;
8363 Exchanged_Views
:= No_Elist
;
8364 Hidden_Entities
:= No_Elist
;
8367 -------------------------------------
8368 -- Insert_Freeze_Node_For_Instance --
8369 -------------------------------------
8371 procedure Insert_Freeze_Node_For_Instance
8380 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
8381 -- Find enclosing package or subprogram body, if any. Freeze node may
8382 -- be placed at end of current declarative list if previous instance
8383 -- and current one have different enclosing bodies.
8385 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
8386 -- Find the local instance, if any, that declares the generic that is
8387 -- being instantiated. If present, the freeze node for this instance
8388 -- must follow the freeze node for the previous instance.
8390 --------------------
8391 -- Enclosing_Body --
8392 --------------------
8394 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
8400 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
8402 if Nkind_In
(P
, N_Package_Body
, N_Subprogram_Body
) then
8403 if Nkind
(Parent
(P
)) = N_Subunit
then
8404 return Corresponding_Stub
(Parent
(P
));
8410 P
:= True_Parent
(P
);
8416 -----------------------
8417 -- Previous_Instance --
8418 -----------------------
8420 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
8426 and then S
/= Standard_Standard
8428 if Is_Generic_Instance
(S
)
8429 and then In_Same_Source_Unit
(S
, N
)
8438 end Previous_Instance
;
8440 -- Start of processing for Insert_Freeze_Node_For_Instance
8443 if not Is_List_Member
(F_Node
) then
8445 Decls
:= List_Containing
(N
);
8446 Inst
:= Entity
(F_Node
);
8447 Par_N
:= Parent
(Decls
);
8449 -- When processing a subprogram instantiation, utilize the actual
8450 -- subprogram instantiation rather than its package wrapper as it
8451 -- carries all the context information.
8453 if Is_Wrapper_Package
(Inst
) then
8454 Inst
:= Related_Instance
(Inst
);
8457 -- If this is a package instance, check whether the generic is
8458 -- declared in a previous instance and the current instance is
8459 -- not within the previous one.
8461 if Present
(Generic_Parent
(Parent
(Inst
)))
8462 and then Is_In_Main_Unit
(N
)
8465 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
8466 Par_I
: constant Entity_Id
:=
8468 (Generic_Parent
(Parent
(Inst
)));
8473 and then Earlier
(N
, Freeze_Node
(Par_I
))
8475 Scop
:= Scope
(Inst
);
8477 -- If the current instance is within the one that contains
8478 -- the generic, the freeze node for the current one must
8479 -- appear in the current declarative part. Ditto, if the
8480 -- current instance is within another package instance or
8481 -- within a body that does not enclose the current instance.
8482 -- In these three cases the freeze node of the previous
8483 -- instance is not relevant.
8485 while Present
(Scop
)
8486 and then Scop
/= Standard_Standard
8488 exit when Scop
= Par_I
8490 (Is_Generic_Instance
(Scop
)
8491 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
8492 Scop
:= Scope
(Scop
);
8495 -- Previous instance encloses current instance
8497 if Scop
= Par_I
then
8500 -- If the next node is a source body we must freeze in
8501 -- the current scope as well.
8503 elsif Present
(Next
(N
))
8504 and then Nkind_In
(Next
(N
),
8505 N_Subprogram_Body
, N_Package_Body
)
8506 and then Comes_From_Source
(Next
(N
))
8510 -- Current instance is within an unrelated instance
8512 elsif Is_Generic_Instance
(Scop
) then
8515 -- Current instance is within an unrelated body
8517 elsif Present
(Enclosing_N
)
8518 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
8523 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
8530 -- When the instantiation occurs in a package declaration, append the
8531 -- freeze node to the private declarations (if any).
8533 if Nkind
(Par_N
) = N_Package_Specification
8534 and then Decls
= Visible_Declarations
(Par_N
)
8535 and then Present
(Private_Declarations
(Par_N
))
8536 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
8538 Decls
:= Private_Declarations
(Par_N
);
8539 Decl
:= First
(Decls
);
8542 -- Determine the proper freeze point of a package instantiation. We
8543 -- adhere to the general rule of a package or subprogram body causing
8544 -- freezing of anything before it in the same declarative region. In
8545 -- this case, the proper freeze point of a package instantiation is
8546 -- before the first source body which follows, or before a stub. This
8547 -- ensures that entities coming from the instance are already frozen
8548 -- and usable in source bodies.
8550 if Nkind
(Par_N
) /= N_Package_Declaration
8551 and then Ekind
(Inst
) = E_Package
8552 and then Is_Generic_Instance
(Inst
)
8554 not In_Same_Source_Unit
(Generic_Parent
(Parent
(Inst
)), Inst
)
8556 while Present
(Decl
) loop
8557 if (Nkind
(Decl
) in N_Unit_Body
8559 Nkind
(Decl
) in N_Body_Stub
)
8560 and then Comes_From_Source
(Decl
)
8562 Insert_Before
(Decl
, F_Node
);
8570 -- In a package declaration, or if no previous body, insert at end
8573 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
8574 Insert_After
(Last
(Decls
), F_Node
);
8576 end Insert_Freeze_Node_For_Instance
;
8582 procedure Install_Body
8583 (Act_Body
: Node_Id
;
8588 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
8589 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
8590 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
8591 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
8592 Gen_Unit
: constant Node_Id
:=
8593 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
8594 Orig_Body
: Node_Id
:= Gen_Body
;
8596 Body_Unit
: Node_Id
;
8598 Must_Delay
: Boolean;
8600 function In_Same_Enclosing_Subp
return Boolean;
8601 -- Check whether instance and generic body are within same subprogram.
8603 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
8604 -- If the instance is nested inside a generic unit, the Sloc of the
8605 -- instance indicates the place of the original definition, not the
8606 -- point of the current enclosing instance. Pending a better usage of
8607 -- Slocs to indicate instantiation places, we determine the place of
8608 -- origin of a node by finding the maximum sloc of any ancestor node.
8609 -- Why is this not equivalent to Top_Level_Location ???
8611 ----------------------------
8612 -- In_Same_Enclosing_Subp --
8613 ----------------------------
8615 function In_Same_Enclosing_Subp
return Boolean is
8620 Scop
:= Scope
(Act_Id
);
8621 while Scop
/= Standard_Standard
8622 and then not Is_Overloadable
(Scop
)
8624 Scop
:= Scope
(Scop
);
8627 if Scop
= Standard_Standard
then
8633 Scop
:= Scope
(Gen_Id
);
8634 while Scop
/= Standard_Standard
loop
8638 Scop
:= Scope
(Scop
);
8643 end In_Same_Enclosing_Subp
;
8649 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
8656 while Present
(N1
) and then N1
/= Act_Unit
loop
8657 if Sloc
(N1
) > Res
then
8667 -- Start of processing for Install_Body
8670 -- If the body is a subunit, the freeze point is the corresponding stub
8671 -- in the current compilation, not the subunit itself.
8673 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
8674 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
8676 Orig_Body
:= Gen_Body
;
8679 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
8681 -- If the instantiation and the generic definition appear in the same
8682 -- package declaration, this is an early instantiation. If they appear
8683 -- in the same declarative part, it is an early instantiation only if
8684 -- the generic body appears textually later, and the generic body is
8685 -- also in the main unit.
8687 -- If instance is nested within a subprogram, and the generic body
8688 -- is not, the instance is delayed because the enclosing body is. If
8689 -- instance and body are within the same scope, or the same subprogram
8690 -- body, indicate explicitly that the instance is delayed.
8693 (Gen_Unit
= Act_Unit
8694 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
8695 N_Generic_Package_Declaration
)
8696 or else (Gen_Unit
= Body_Unit
8697 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
8698 and then Is_In_Main_Unit
(Gen_Unit
)
8699 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
8700 or else In_Same_Enclosing_Subp
));
8702 -- If this is an early instantiation, the freeze node is placed after
8703 -- the generic body. Otherwise, if the generic appears in an instance,
8704 -- we cannot freeze the current instance until the outer one is frozen.
8705 -- This is only relevant if the current instance is nested within some
8706 -- inner scope not itself within the outer instance. If this scope is
8707 -- a package body in the same declarative part as the outer instance,
8708 -- then that body needs to be frozen after the outer instance. Finally,
8709 -- if no delay is needed, we place the freeze node at the end of the
8710 -- current declarative part.
8712 if Expander_Active
then
8713 Ensure_Freeze_Node
(Act_Id
);
8714 F_Node
:= Freeze_Node
(Act_Id
);
8717 Insert_After
(Orig_Body
, F_Node
);
8719 elsif Is_Generic_Instance
(Par
)
8720 and then Present
(Freeze_Node
(Par
))
8721 and then Scope
(Act_Id
) /= Par
8723 -- Freeze instance of inner generic after instance of enclosing
8726 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
8728 -- Handle the following case:
8730 -- package Parent_Inst is new ...
8733 -- procedure P ... -- this body freezes Parent_Inst
8735 -- package Inst is new ...
8737 -- In this particular scenario, the freeze node for Inst must
8738 -- be inserted in the same manner as that of Parent_Inst,
8739 -- before the next source body or at the end of the declarative
8740 -- list (body not available). If body P did not exist and
8741 -- Parent_Inst was frozen after Inst, either by a body
8742 -- following Inst or at the end of the declarative region,
8743 -- the freeze node for Inst must be inserted after that of
8744 -- Parent_Inst. This relation is established by comparing
8745 -- the Slocs of Parent_Inst freeze node and Inst.
8747 if List_Containing
(Get_Package_Instantiation_Node
(Par
)) =
8749 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(N
)
8751 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8753 Insert_After
(Freeze_Node
(Par
), F_Node
);
8756 -- Freeze package enclosing instance of inner generic after
8757 -- instance of enclosing generic.
8759 elsif Nkind_In
(Parent
(N
), N_Package_Body
, N_Subprogram_Body
)
8760 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
8763 Enclosing
: Entity_Id
;
8766 Enclosing
:= Corresponding_Spec
(Parent
(N
));
8768 if No
(Enclosing
) then
8769 Enclosing
:= Defining_Entity
(Parent
(N
));
8772 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8773 Ensure_Freeze_Node
(Enclosing
);
8775 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
8777 -- The enclosing context is a subunit, insert the freeze
8778 -- node after the stub.
8780 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
8781 Insert_Freeze_Node_For_Instance
8782 (Corresponding_Stub
(Parent
(Parent
(N
))),
8783 Freeze_Node
(Enclosing
));
8785 -- The enclosing context is a package with a stub body
8786 -- which has already been replaced by the real body.
8787 -- Insert the freeze node after the actual body.
8789 elsif Ekind
(Enclosing
) = E_Package
8790 and then Present
(Body_Entity
(Enclosing
))
8791 and then Was_Originally_Stub
8792 (Parent
(Body_Entity
(Enclosing
)))
8794 Insert_Freeze_Node_For_Instance
8795 (Parent
(Body_Entity
(Enclosing
)),
8796 Freeze_Node
(Enclosing
));
8798 -- The parent instance has been frozen before the body of
8799 -- the enclosing package, insert the freeze node after
8802 elsif List_Containing
(Freeze_Node
(Par
)) =
8803 List_Containing
(Parent
(N
))
8804 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Parent
(N
))
8806 Insert_Freeze_Node_For_Instance
8807 (Parent
(N
), Freeze_Node
(Enclosing
));
8811 (Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
8817 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8821 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
8825 Set_Is_Frozen
(Act_Id
);
8826 Insert_Before
(N
, Act_Body
);
8827 Mark_Rewrite_Insertion
(Act_Body
);
8830 -----------------------------
8831 -- Install_Formal_Packages --
8832 -----------------------------
8834 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
8837 Gen_E
: Entity_Id
:= Empty
;
8840 E
:= First_Entity
(Par
);
8842 -- If we are installing an instance parent, locate the formal packages
8843 -- of its generic parent.
8845 if Is_Generic_Instance
(Par
) then
8846 Gen
:= Generic_Parent
(Package_Specification
(Par
));
8847 Gen_E
:= First_Entity
(Gen
);
8850 while Present
(E
) loop
8851 if Ekind
(E
) = E_Package
8852 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
8854 -- If this is the renaming for the parent instance, done
8856 if Renamed_Object
(E
) = Par
then
8859 -- The visibility of a formal of an enclosing generic is already
8862 elsif Denotes_Formal_Package
(E
) then
8865 elsif Present
(Associated_Formal_Package
(E
)) then
8866 Check_Generic_Actuals
(Renamed_Object
(E
), True);
8867 Set_Is_Hidden
(E
, False);
8869 -- Find formal package in generic unit that corresponds to
8870 -- (instance of) formal package in instance.
8872 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
8873 Next_Entity
(Gen_E
);
8876 if Present
(Gen_E
) then
8877 Map_Formal_Package_Entities
(Gen_E
, E
);
8883 if Present
(Gen_E
) then
8884 Next_Entity
(Gen_E
);
8887 end Install_Formal_Packages
;
8889 --------------------
8890 -- Install_Parent --
8891 --------------------
8893 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
8894 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
8895 S
: constant Entity_Id
:= Current_Scope
;
8896 Inst_Par
: Entity_Id
;
8897 First_Par
: Entity_Id
;
8898 Inst_Node
: Node_Id
;
8899 Gen_Par
: Entity_Id
;
8900 First_Gen
: Entity_Id
;
8903 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
8904 -- Install the scopes of noninstance parent units ending with Par
8906 procedure Install_Spec
(Par
: Entity_Id
);
8907 -- The child unit is within the declarative part of the parent, so the
8908 -- declarations within the parent are immediately visible.
8910 -------------------------------
8911 -- Install_Noninstance_Specs --
8912 -------------------------------
8914 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
8917 and then Par
/= Standard_Standard
8918 and then not In_Open_Scopes
(Par
)
8920 Install_Noninstance_Specs
(Scope
(Par
));
8923 end Install_Noninstance_Specs
;
8929 procedure Install_Spec
(Par
: Entity_Id
) is
8930 Spec
: constant Node_Id
:= Package_Specification
(Par
);
8933 -- If this parent of the child instance is a top-level unit,
8934 -- then record the unit and its visibility for later resetting in
8935 -- Remove_Parent. We exclude units that are generic instances, as we
8936 -- only want to record this information for the ultimate top-level
8937 -- noninstance parent (is that always correct???).
8939 if Scope
(Par
) = Standard_Standard
8940 and then not Is_Generic_Instance
(Par
)
8942 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
8943 Instance_Parent_Unit
:= Par
;
8946 -- Open the parent scope and make it and its declarations visible.
8947 -- If this point is not within a body, then only the visible
8948 -- declarations should be made visible, and installation of the
8949 -- private declarations is deferred until the appropriate point
8950 -- within analysis of the spec being instantiated (see the handling
8951 -- of parent visibility in Analyze_Package_Specification). This is
8952 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8953 -- private view problems that occur when compiling instantiations of
8954 -- a generic child of that package (Generic_Dispatching_Constructor).
8955 -- If the instance freezes a tagged type, inlinings of operations
8956 -- from Ada.Tags may need the full view of type Tag. If inlining took
8957 -- proper account of establishing visibility of inlined subprograms'
8958 -- parents then it should be possible to remove this
8959 -- special check. ???
8962 Set_Is_Immediately_Visible
(Par
);
8963 Install_Visible_Declarations
(Par
);
8964 Set_Use
(Visible_Declarations
(Spec
));
8966 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
8967 Install_Private_Declarations
(Par
);
8968 Set_Use
(Private_Declarations
(Spec
));
8972 -- Start of processing for Install_Parent
8975 -- We need to install the parent instance to compile the instantiation
8976 -- of the child, but the child instance must appear in the current
8977 -- scope. Given that we cannot place the parent above the current scope
8978 -- in the scope stack, we duplicate the current scope and unstack both
8979 -- after the instantiation is complete.
8981 -- If the parent is itself the instantiation of a child unit, we must
8982 -- also stack the instantiation of its parent, and so on. Each such
8983 -- ancestor is the prefix of the name in a prior instantiation.
8985 -- If this is a nested instance, the parent unit itself resolves to
8986 -- a renaming of the parent instance, whose declaration we need.
8988 -- Finally, the parent may be a generic (not an instance) when the
8989 -- child unit appears as a formal package.
8993 if Present
(Renamed_Entity
(Inst_Par
)) then
8994 Inst_Par
:= Renamed_Entity
(Inst_Par
);
8997 First_Par
:= Inst_Par
;
8999 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9001 First_Gen
:= Gen_Par
;
9003 while Present
(Gen_Par
)
9004 and then Is_Child_Unit
(Gen_Par
)
9006 -- Load grandparent instance as well
9008 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
9010 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
9011 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
9013 if Present
(Renamed_Entity
(Inst_Par
)) then
9014 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9017 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9019 if Present
(Gen_Par
) then
9020 Prepend_Elmt
(Inst_Par
, Ancestors
);
9023 -- Parent is not the name of an instantiation
9025 Install_Noninstance_Specs
(Inst_Par
);
9036 if Present
(First_Gen
) then
9037 Append_Elmt
(First_Par
, Ancestors
);
9039 Install_Noninstance_Specs
(First_Par
);
9042 if not Is_Empty_Elmt_List
(Ancestors
) then
9043 Elmt
:= First_Elmt
(Ancestors
);
9044 while Present
(Elmt
) loop
9045 Install_Spec
(Node
(Elmt
));
9046 Install_Formal_Packages
(Node
(Elmt
));
9056 -------------------------------
9057 -- Install_Hidden_Primitives --
9058 -------------------------------
9060 procedure Install_Hidden_Primitives
9061 (Prims_List
: in out Elist_Id
;
9066 List
: Elist_Id
:= No_Elist
;
9067 Prim_G_Elmt
: Elmt_Id
;
9068 Prim_A_Elmt
: Elmt_Id
;
9073 -- No action needed in case of serious errors because we cannot trust
9074 -- in the order of primitives
9076 if Serious_Errors_Detected
> 0 then
9079 -- No action possible if we don't have available the list of primitive
9083 or else not Is_Record_Type
(Gen_T
)
9084 or else not Is_Tagged_Type
(Gen_T
)
9085 or else not Is_Record_Type
(Act_T
)
9086 or else not Is_Tagged_Type
(Act_T
)
9090 -- There is no need to handle interface types since their primitives
9093 elsif Is_Interface
(Gen_T
) then
9097 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
9099 if not Is_Class_Wide_Type
(Act_T
) then
9100 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
9102 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
9106 -- Skip predefined primitives in the generic formal
9108 while Present
(Prim_G_Elmt
)
9109 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
9111 Next_Elmt
(Prim_G_Elmt
);
9114 -- Skip predefined primitives in the generic actual
9116 while Present
(Prim_A_Elmt
)
9117 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
9119 Next_Elmt
(Prim_A_Elmt
);
9122 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
9124 Prim_G
:= Node
(Prim_G_Elmt
);
9125 Prim_A
:= Node
(Prim_A_Elmt
);
9127 -- There is no need to handle interface primitives because their
9128 -- primitives are not hidden
9130 exit when Present
(Interface_Alias
(Prim_G
));
9132 -- Here we install one hidden primitive
9134 if Chars
(Prim_G
) /= Chars
(Prim_A
)
9135 and then Has_Suffix
(Prim_A
, 'P')
9136 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
9138 Set_Chars
(Prim_A
, Chars
(Prim_G
));
9139 Append_New_Elmt
(Prim_A
, To
=> List
);
9142 Next_Elmt
(Prim_A_Elmt
);
9143 Next_Elmt
(Prim_G_Elmt
);
9146 -- Append the elements to the list of temporarily visible primitives
9147 -- avoiding duplicates.
9149 if Present
(List
) then
9150 if No
(Prims_List
) then
9151 Prims_List
:= New_Elmt_List
;
9154 Elmt
:= First_Elmt
(List
);
9155 while Present
(Elmt
) loop
9156 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
9160 end Install_Hidden_Primitives
;
9162 -------------------------------
9163 -- Restore_Hidden_Primitives --
9164 -------------------------------
9166 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
9167 Prim_Elmt
: Elmt_Id
;
9171 if Prims_List
/= No_Elist
then
9172 Prim_Elmt
:= First_Elmt
(Prims_List
);
9173 while Present
(Prim_Elmt
) loop
9174 Prim
:= Node
(Prim_Elmt
);
9175 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
9176 Next_Elmt
(Prim_Elmt
);
9179 Prims_List
:= No_Elist
;
9181 end Restore_Hidden_Primitives
;
9183 --------------------------------
9184 -- Instantiate_Formal_Package --
9185 --------------------------------
9187 function Instantiate_Formal_Package
9190 Analyzed_Formal
: Node_Id
) return List_Id
9192 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9193 Actual_Pack
: Entity_Id
;
9194 Formal_Pack
: Entity_Id
;
9195 Gen_Parent
: Entity_Id
;
9198 Parent_Spec
: Node_Id
;
9200 procedure Find_Matching_Actual
9202 Act
: in out Entity_Id
);
9203 -- We need to associate each formal entity in the formal package with
9204 -- the corresponding entity in the actual package. The actual package
9205 -- has been analyzed and possibly expanded, and as a result there is
9206 -- no one-to-one correspondence between the two lists (for example,
9207 -- the actual may include subtypes, itypes, and inherited primitive
9208 -- operations, interspersed among the renaming declarations for the
9209 -- actuals) . We retrieve the corresponding actual by name because each
9210 -- actual has the same name as the formal, and they do appear in the
9213 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
9214 -- Retrieve entity of defining entity of generic formal parameter.
9215 -- Only the declarations of formals need to be considered when
9216 -- linking them to actuals, but the declarative list may include
9217 -- internal entities generated during analysis, and those are ignored.
9219 procedure Match_Formal_Entity
9220 (Formal_Node
: Node_Id
;
9221 Formal_Ent
: Entity_Id
;
9222 Actual_Ent
: Entity_Id
);
9223 -- Associates the formal entity with the actual. In the case where
9224 -- Formal_Ent is a formal package, this procedure iterates through all
9225 -- of its formals and enters associations between the actuals occurring
9226 -- in the formal package's corresponding actual package (given by
9227 -- Actual_Ent) and the formal package's formal parameters. This
9228 -- procedure recurses if any of the parameters is itself a package.
9230 function Is_Instance_Of
9231 (Act_Spec
: Entity_Id
;
9232 Gen_Anc
: Entity_Id
) return Boolean;
9233 -- The actual can be an instantiation of a generic within another
9234 -- instance, in which case there is no direct link from it to the
9235 -- original generic ancestor. In that case, we recognize that the
9236 -- ultimate ancestor is the same by examining names and scopes.
9238 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
9239 -- If the current formal is declared with a box, its own formals are
9240 -- visible in the instance, as they were in the generic, and their
9241 -- Hidden flag must be reset. If some of these formals are themselves
9242 -- packages declared with a box, the processing must be recursive.
9244 --------------------------
9245 -- Find_Matching_Actual --
9246 --------------------------
9248 procedure Find_Matching_Actual
9250 Act
: in out Entity_Id
)
9252 Formal_Ent
: Entity_Id
;
9255 case Nkind
(Original_Node
(F
)) is
9256 when N_Formal_Object_Declaration |
9257 N_Formal_Type_Declaration
=>
9258 Formal_Ent
:= Defining_Identifier
(F
);
9260 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
9264 when N_Formal_Subprogram_Declaration |
9265 N_Formal_Package_Declaration |
9266 N_Package_Declaration |
9267 N_Generic_Package_Declaration
=>
9268 Formal_Ent
:= Defining_Entity
(F
);
9270 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
9275 raise Program_Error
;
9277 end Find_Matching_Actual
;
9279 -------------------------
9280 -- Match_Formal_Entity --
9281 -------------------------
9283 procedure Match_Formal_Entity
9284 (Formal_Node
: Node_Id
;
9285 Formal_Ent
: Entity_Id
;
9286 Actual_Ent
: Entity_Id
)
9288 Act_Pkg
: Entity_Id
;
9291 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
9293 if Ekind
(Actual_Ent
) = E_Package
then
9295 -- Record associations for each parameter
9297 Act_Pkg
:= Actual_Ent
;
9300 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
9309 -- Retrieve the actual given in the formal package declaration
9311 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
9313 -- The actual in the formal package declaration may be a
9314 -- renamed generic package, in which case we want to retrieve
9315 -- the original generic in order to traverse its formal part.
9317 if Present
(Renamed_Entity
(Actual
)) then
9318 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
9320 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
9323 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
9325 if Present
(Formals
) then
9326 F_Node
:= First_Non_Pragma
(Formals
);
9331 while Present
(A_Ent
)
9332 and then Present
(F_Node
)
9333 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
9335 F_Ent
:= Get_Formal_Entity
(F_Node
);
9337 if Present
(F_Ent
) then
9339 -- This is a formal of the original package. Record
9340 -- association and recurse.
9342 Find_Matching_Actual
(F_Node
, A_Ent
);
9343 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
9344 Next_Entity
(A_Ent
);
9347 Next_Non_Pragma
(F_Node
);
9351 end Match_Formal_Entity
;
9353 -----------------------
9354 -- Get_Formal_Entity --
9355 -----------------------
9357 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
9358 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
9361 when N_Formal_Object_Declaration
=>
9362 return Defining_Identifier
(N
);
9364 when N_Formal_Type_Declaration
=>
9365 return Defining_Identifier
(N
);
9367 when N_Formal_Subprogram_Declaration
=>
9368 return Defining_Unit_Name
(Specification
(N
));
9370 when N_Formal_Package_Declaration
=>
9371 return Defining_Identifier
(Original_Node
(N
));
9373 when N_Generic_Package_Declaration
=>
9374 return Defining_Identifier
(Original_Node
(N
));
9376 -- All other declarations are introduced by semantic analysis and
9377 -- have no match in the actual.
9382 end Get_Formal_Entity
;
9384 --------------------
9385 -- Is_Instance_Of --
9386 --------------------
9388 function Is_Instance_Of
9389 (Act_Spec
: Entity_Id
;
9390 Gen_Anc
: Entity_Id
) return Boolean
9392 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
9395 if No
(Gen_Par
) then
9398 -- Simplest case: the generic parent of the actual is the formal
9400 elsif Gen_Par
= Gen_Anc
then
9403 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
9406 -- The actual may be obtained through several instantiations. Its
9407 -- scope must itself be an instance of a generic declared in the
9408 -- same scope as the formal. Any other case is detected above.
9410 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
9414 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
9418 ---------------------------
9419 -- Process_Nested_Formal --
9420 ---------------------------
9422 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
9426 if Present
(Associated_Formal_Package
(Formal
))
9427 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
9429 Ent
:= First_Entity
(Formal
);
9430 while Present
(Ent
) loop
9431 Set_Is_Hidden
(Ent
, False);
9432 Set_Is_Visible_Formal
(Ent
);
9433 Set_Is_Potentially_Use_Visible
9434 (Ent
, Is_Potentially_Use_Visible
(Formal
));
9436 if Ekind
(Ent
) = E_Package
then
9437 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
9438 Process_Nested_Formal
(Ent
);
9444 end Process_Nested_Formal
;
9446 -- Start of processing for Instantiate_Formal_Package
9451 if not Is_Entity_Name
(Actual
)
9452 or else Ekind
(Entity
(Actual
)) /= E_Package
9455 ("expect package instance to instantiate formal", Actual
);
9456 Abandon_Instantiation
(Actual
);
9457 raise Program_Error
;
9460 Actual_Pack
:= Entity
(Actual
);
9461 Set_Is_Instantiated
(Actual_Pack
);
9463 -- The actual may be a renamed package, or an outer generic formal
9464 -- package whose instantiation is converted into a renaming.
9466 if Present
(Renamed_Object
(Actual_Pack
)) then
9467 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
9470 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
9471 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
9472 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
9475 Generic_Parent
(Specification
(Analyzed_Formal
));
9477 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9480 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
9481 Parent_Spec
:= Package_Specification
(Actual_Pack
);
9483 Parent_Spec
:= Parent
(Actual_Pack
);
9486 if Gen_Parent
= Any_Id
then
9488 ("previous error in declaration of formal package", Actual
);
9489 Abandon_Instantiation
(Actual
);
9492 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
9498 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
9499 Abandon_Instantiation
(Actual
);
9502 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
9503 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
9506 Make_Package_Renaming_Declaration
(Loc
,
9507 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
9508 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
9510 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
9511 Defining_Identifier
(Formal
));
9512 Decls
:= New_List
(Nod
);
9514 -- If the formal F has a box, then the generic declarations are
9515 -- visible in the generic G. In an instance of G, the corresponding
9516 -- entities in the actual for F (which are the actuals for the
9517 -- instantiation of the generic that F denotes) must also be made
9518 -- visible for analysis of the current instance. On exit from the
9519 -- current instance, those entities are made private again. If the
9520 -- actual is currently in use, these entities are also use-visible.
9522 -- The loop through the actual entities also steps through the formal
9523 -- entities and enters associations from formals to actuals into the
9524 -- renaming map. This is necessary to properly handle checking of
9525 -- actual parameter associations for later formals that depend on
9526 -- actuals declared in the formal package.
9528 -- In Ada 2005, partial parameterization requires that we make
9529 -- visible the actuals corresponding to formals that were defaulted
9530 -- in the formal package. There formals are identified because they
9531 -- remain formal generics within the formal package, rather than
9532 -- being renamings of the actuals supplied.
9535 Gen_Decl
: constant Node_Id
:=
9536 Unit_Declaration_Node
(Gen_Parent
);
9537 Formals
: constant List_Id
:=
9538 Generic_Formal_Declarations
(Gen_Decl
);
9540 Actual_Ent
: Entity_Id
;
9541 Actual_Of_Formal
: Node_Id
;
9542 Formal_Node
: Node_Id
;
9543 Formal_Ent
: Entity_Id
;
9546 if Present
(Formals
) then
9547 Formal_Node
:= First_Non_Pragma
(Formals
);
9549 Formal_Node
:= Empty
;
9552 Actual_Ent
:= First_Entity
(Actual_Pack
);
9554 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
9555 while Present
(Actual_Ent
)
9556 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9558 if Present
(Formal_Node
) then
9559 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
9561 if Present
(Formal_Ent
) then
9562 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
9564 (Formal_Node
, Formal_Ent
, Actual_Ent
);
9566 -- We iterate at the same time over the actuals of the
9567 -- local package created for the formal, to determine
9568 -- which one of the formals of the original generic were
9569 -- defaulted in the formal. The corresponding actual
9570 -- entities are visible in the enclosing instance.
9572 if Box_Present
(Formal
)
9574 (Present
(Actual_Of_Formal
)
9577 (Get_Formal_Entity
(Actual_Of_Formal
)))
9579 Set_Is_Hidden
(Actual_Ent
, False);
9580 Set_Is_Visible_Formal
(Actual_Ent
);
9581 Set_Is_Potentially_Use_Visible
9582 (Actual_Ent
, In_Use
(Actual_Pack
));
9584 if Ekind
(Actual_Ent
) = E_Package
then
9585 Process_Nested_Formal
(Actual_Ent
);
9589 Set_Is_Hidden
(Actual_Ent
);
9590 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
9594 Next_Non_Pragma
(Formal_Node
);
9595 Next
(Actual_Of_Formal
);
9598 -- No further formals to match, but the generic part may
9599 -- contain inherited operation that are not hidden in the
9600 -- enclosing instance.
9602 Next_Entity
(Actual_Ent
);
9606 -- Inherited subprograms generated by formal derived types are
9607 -- also visible if the types are.
9609 Actual_Ent
:= First_Entity
(Actual_Pack
);
9610 while Present
(Actual_Ent
)
9611 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
9613 if Is_Overloadable
(Actual_Ent
)
9615 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
9617 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
9619 Set_Is_Hidden
(Actual_Ent
, False);
9620 Set_Is_Potentially_Use_Visible
9621 (Actual_Ent
, In_Use
(Actual_Pack
));
9624 Next_Entity
(Actual_Ent
);
9628 -- If the formal is not declared with a box, reanalyze it as an
9629 -- abbreviated instantiation, to verify the matching rules of 12.7.
9630 -- The actual checks are performed after the generic associations
9631 -- have been analyzed, to guarantee the same visibility for this
9632 -- instantiation and for the actuals.
9634 -- In Ada 2005, the generic associations for the formal can include
9635 -- defaulted parameters. These are ignored during check. This
9636 -- internal instantiation is removed from the tree after conformance
9637 -- checking, because it contains formal declarations for those
9638 -- defaulted parameters, and those should not reach the back-end.
9640 if not Box_Present
(Formal
) then
9642 I_Pack
: constant Entity_Id
:=
9643 Make_Temporary
(Sloc
(Actual
), 'P');
9646 Set_Is_Internal
(I_Pack
);
9649 Make_Package_Instantiation
(Sloc
(Actual
),
9650 Defining_Unit_Name
=> I_Pack
,
9653 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
9654 Generic_Associations
=>
9655 Generic_Associations
(Formal
)));
9661 end Instantiate_Formal_Package
;
9663 -----------------------------------
9664 -- Instantiate_Formal_Subprogram --
9665 -----------------------------------
9667 function Instantiate_Formal_Subprogram
9670 Analyzed_Formal
: Node_Id
) return Node_Id
9672 Analyzed_S
: constant Entity_Id
:=
9673 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
9674 Formal_Sub
: constant Entity_Id
:=
9675 Defining_Unit_Name
(Specification
(Formal
));
9677 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
9678 -- If the generic is a child unit, the parent has been installed on the
9679 -- scope stack, but a default subprogram cannot resolve to something
9680 -- on the parent because that parent is not really part of the visible
9681 -- context (it is there to resolve explicit local entities). If the
9682 -- default has resolved in this way, we remove the entity from immediate
9683 -- visibility and analyze the node again to emit an error message or
9684 -- find another visible candidate.
9686 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
9687 -- Perform legality check and raise exception on failure
9689 -----------------------
9690 -- From_Parent_Scope --
9691 -----------------------
9693 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
9694 Gen_Scope
: Node_Id
;
9697 Gen_Scope
:= Scope
(Analyzed_S
);
9698 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
9699 if Scope
(Subp
) = Scope
(Gen_Scope
) then
9703 Gen_Scope
:= Scope
(Gen_Scope
);
9707 end From_Parent_Scope
;
9709 -----------------------------
9710 -- Valid_Actual_Subprogram --
9711 -----------------------------
9713 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
9717 if Is_Entity_Name
(Act
) then
9718 Act_E
:= Entity
(Act
);
9720 elsif Nkind
(Act
) = N_Selected_Component
9721 and then Is_Entity_Name
(Selector_Name
(Act
))
9723 Act_E
:= Entity
(Selector_Name
(Act
));
9729 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
9730 or else Nkind_In
(Act
, N_Attribute_Reference
,
9731 N_Indexed_Component
,
9732 N_Character_Literal
,
9733 N_Explicit_Dereference
)
9739 ("expect subprogram or entry name in instantiation of&",
9740 Instantiation_Node
, Formal_Sub
);
9741 Abandon_Instantiation
(Instantiation_Node
);
9742 end Valid_Actual_Subprogram
;
9746 Decl_Node
: Node_Id
;
9751 -- Start of processing for Instantiate_Formal_Subprogram
9754 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
9756 -- The tree copy has created the proper instantiation sloc for the
9757 -- new specification. Use this location for all other constructed
9760 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
9762 -- Create new entity for the actual (New_Copy_Tree does not), and
9763 -- indicate that it is an actual.
9765 Set_Defining_Unit_Name
9766 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9767 Set_Ekind
(Defining_Unit_Name
(New_Spec
), Ekind
(Analyzed_S
));
9768 Set_Is_Generic_Actual_Subprogram
(Defining_Unit_Name
(New_Spec
));
9770 -- Create new entities for the each of the formals in the specification
9771 -- of the renaming declaration built for the actual.
9773 if Present
(Parameter_Specifications
(New_Spec
)) then
9779 F
:= First
(Parameter_Specifications
(New_Spec
));
9780 while Present
(F
) loop
9781 F_Id
:= Defining_Identifier
(F
);
9783 Set_Defining_Identifier
(F
,
9784 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
9790 -- Find entity of actual. If the actual is an attribute reference, it
9791 -- cannot be resolved here (its formal is missing) but is handled
9792 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9793 -- fully resolved subsequently, when the renaming declaration for the
9794 -- formal is analyzed. If it is an explicit dereference, resolve the
9795 -- prefix but not the actual itself, to prevent interpretation as call.
9797 if Present
(Actual
) then
9798 Loc
:= Sloc
(Actual
);
9799 Set_Sloc
(New_Spec
, Loc
);
9801 if Nkind
(Actual
) = N_Operator_Symbol
then
9802 Find_Direct_Name
(Actual
);
9804 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
9805 Analyze
(Prefix
(Actual
));
9807 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
9811 Valid_Actual_Subprogram
(Actual
);
9814 elsif Present
(Default_Name
(Formal
)) then
9815 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
9816 N_Selected_Component
,
9817 N_Indexed_Component
,
9818 N_Character_Literal
)
9819 and then Present
(Entity
(Default_Name
(Formal
)))
9821 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
9823 Nam
:= New_Copy
(Default_Name
(Formal
));
9824 Set_Sloc
(Nam
, Loc
);
9827 elsif Box_Present
(Formal
) then
9829 -- Actual is resolved at the point of instantiation. Create an
9830 -- identifier or operator with the same name as the formal.
9832 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
9834 Make_Operator_Symbol
(Loc
,
9835 Chars
=> Chars
(Formal_Sub
),
9836 Strval
=> No_String
);
9838 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
9841 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
9842 and then Null_Present
(Specification
(Formal
))
9844 -- Generate null body for procedure, for use in the instance
9847 Make_Subprogram_Body
(Loc
,
9848 Specification
=> New_Spec
,
9849 Declarations
=> New_List
,
9850 Handled_Statement_Sequence
=>
9851 Make_Handled_Sequence_Of_Statements
(Loc
,
9852 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
9854 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
9858 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
9860 ("missing actual&", Instantiation_Node
, Formal_Sub
);
9862 ("\in instantiation of & declared#",
9863 Instantiation_Node
, Scope
(Analyzed_S
));
9864 Abandon_Instantiation
(Instantiation_Node
);
9868 Make_Subprogram_Renaming_Declaration
(Loc
,
9869 Specification
=> New_Spec
,
9872 -- If we do not have an actual and the formal specified <> then set to
9873 -- get proper default.
9875 if No
(Actual
) and then Box_Present
(Formal
) then
9876 Set_From_Default
(Decl_Node
);
9879 -- Gather possible interpretations for the actual before analyzing the
9880 -- instance. If overloaded, it will be resolved when analyzing the
9881 -- renaming declaration.
9883 if Box_Present
(Formal
) and then No
(Actual
) then
9886 if Is_Child_Unit
(Scope
(Analyzed_S
))
9887 and then Present
(Entity
(Nam
))
9889 if not Is_Overloaded
(Nam
) then
9890 if From_Parent_Scope
(Entity
(Nam
)) then
9891 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
9892 Set_Entity
(Nam
, Empty
);
9893 Set_Etype
(Nam
, Empty
);
9896 Set_Is_Immediately_Visible
(Entity
(Nam
));
9905 Get_First_Interp
(Nam
, I
, It
);
9906 while Present
(It
.Nam
) loop
9907 if From_Parent_Scope
(It
.Nam
) then
9911 Get_Next_Interp
(I
, It
);
9918 -- The generic instantiation freezes the actual. This can only be done
9919 -- once the actual is resolved, in the analysis of the renaming
9920 -- declaration. To make the formal subprogram entity available, we set
9921 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9922 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9923 -- of formal abstract subprograms.
9925 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
9927 -- We cannot analyze the renaming declaration, and thus find the actual,
9928 -- until all the actuals are assembled in the instance. For subsequent
9929 -- checks of other actuals, indicate the node that will hold the
9930 -- instance of this formal.
9932 Set_Instance_Of
(Analyzed_S
, Nam
);
9934 if Nkind
(Actual
) = N_Selected_Component
9935 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
9936 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
9938 -- The renaming declaration will create a body, which must appear
9939 -- outside of the instantiation, We move the renaming declaration
9940 -- out of the instance, and create an additional renaming inside,
9941 -- to prevent freezing anomalies.
9944 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
9947 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
9948 Insert_Before
(Instantiation_Node
, Decl_Node
);
9949 Analyze
(Decl_Node
);
9951 -- Now create renaming within the instance
9954 Make_Subprogram_Renaming_Declaration
(Loc
,
9955 Specification
=> New_Copy_Tree
(New_Spec
),
9956 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
9958 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
9959 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
9964 end Instantiate_Formal_Subprogram
;
9966 ------------------------
9967 -- Instantiate_Object --
9968 ------------------------
9970 function Instantiate_Object
9973 Analyzed_Formal
: Node_Id
) return List_Id
9975 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
9976 A_Gen_Obj
: constant Entity_Id
:=
9977 Defining_Identifier
(Analyzed_Formal
);
9978 Acc_Def
: Node_Id
:= Empty
;
9979 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
9980 Actual_Decl
: Node_Id
:= Empty
;
9981 Decl_Node
: Node_Id
;
9984 List
: constant List_Id
:= New_List
;
9985 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9986 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
9987 Subt_Decl
: Node_Id
:= Empty
;
9988 Subt_Mark
: Node_Id
:= Empty
;
9991 if Present
(Subtype_Mark
(Formal
)) then
9992 Subt_Mark
:= Subtype_Mark
(Formal
);
9994 Check_Access_Definition
(Formal
);
9995 Acc_Def
:= Access_Definition
(Formal
);
9998 -- Sloc for error message on missing actual
10000 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
10002 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
10003 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
10006 Set_Parent
(List
, Parent
(Actual
));
10010 if Out_Present
(Formal
) then
10012 -- An IN OUT generic actual must be a name. The instantiation is a
10013 -- renaming declaration. The actual is the name being renamed. We
10014 -- use the actual directly, rather than a copy, because it is not
10015 -- used further in the list of actuals, and because a copy or a use
10016 -- of relocate_node is incorrect if the instance is nested within a
10017 -- generic. In order to simplify ASIS searches, the Generic_Parent
10018 -- field links the declaration to the generic association.
10020 if No
(Actual
) then
10022 ("missing actual&",
10023 Instantiation_Node
, Gen_Obj
);
10025 ("\in instantiation of & declared#",
10026 Instantiation_Node
, Scope
(A_Gen_Obj
));
10027 Abandon_Instantiation
(Instantiation_Node
);
10030 if Present
(Subt_Mark
) then
10032 Make_Object_Renaming_Declaration
(Loc
,
10033 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10034 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
10037 else pragma Assert
(Present
(Acc_Def
));
10039 Make_Object_Renaming_Declaration
(Loc
,
10040 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10041 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
10045 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10047 -- The analysis of the actual may produce Insert_Action nodes, so
10048 -- the declaration must have a context in which to attach them.
10050 Append
(Decl_Node
, List
);
10053 -- Return if the analysis of the actual reported some error
10055 if Etype
(Actual
) = Any_Type
then
10059 -- This check is performed here because Analyze_Object_Renaming will
10060 -- not check it when Comes_From_Source is False. Note though that the
10061 -- check for the actual being the name of an object will be performed
10062 -- in Analyze_Object_Renaming.
10064 if Is_Object_Reference
(Actual
)
10065 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
10068 ("illegal discriminant-dependent component for in out parameter",
10072 -- The actual has to be resolved in order to check that it is a
10073 -- variable (due to cases such as F (1), where F returns access to
10074 -- an array, and for overloaded prefixes).
10076 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
10078 -- If the type of the formal is not itself a formal, and the current
10079 -- unit is a child unit, the formal type must be declared in a
10080 -- parent, and must be retrieved by visibility.
10082 if Ftyp
= Orig_Ftyp
10083 and then Is_Generic_Unit
(Scope
(Ftyp
))
10084 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
10087 Temp
: constant Node_Id
:=
10088 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
10090 Set_Entity
(Temp
, Empty
);
10092 Ftyp
:= Entity
(Temp
);
10096 if Is_Private_Type
(Ftyp
)
10097 and then not Is_Private_Type
(Etype
(Actual
))
10098 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
10099 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
10101 -- If the actual has the type of the full view of the formal, or
10102 -- else a non-private subtype of the formal, then the visibility
10103 -- of the formal type has changed. Add to the actuals a subtype
10104 -- declaration that will force the exchange of views in the body
10105 -- of the instance as well.
10108 Make_Subtype_Declaration
(Loc
,
10109 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
10110 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
10112 Prepend
(Subt_Decl
, List
);
10114 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
10115 Exchange_Declarations
(Ftyp
);
10118 Resolve
(Actual
, Ftyp
);
10120 if not Denotes_Variable
(Actual
) then
10122 ("actual for& must be a variable", Actual
, Gen_Obj
);
10124 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
10126 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
10127 -- the type of the actual shall resolve to a specific anonymous
10130 if Ada_Version
< Ada_2005
10131 or else Ekind
(Base_Type
(Ftyp
)) /=
10132 E_Anonymous_Access_Type
10133 or else Ekind
(Base_Type
(Etype
(Actual
))) /=
10134 E_Anonymous_Access_Type
10137 ("type of actual does not match type of&", Actual
, Gen_Obj
);
10141 Note_Possible_Modification
(Actual
, Sure
=> True);
10143 -- Check for instantiation of atomic/volatile actual for
10144 -- non-atomic/volatile formal (RM C.6 (12)).
10146 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
10148 ("cannot instantiate non-atomic formal object "
10149 & "with atomic actual", Actual
);
10151 elsif Is_Volatile_Object
(Actual
) and then not Is_Volatile
(Orig_Ftyp
)
10154 ("cannot instantiate non-volatile formal object "
10155 & "with volatile actual", Actual
);
10158 -- Formal in-parameter
10161 -- The instantiation of a generic formal in-parameter is constant
10162 -- declaration. The actual is the expression for that declaration.
10164 if Present
(Actual
) then
10165 if Present
(Subt_Mark
) then
10167 else pragma Assert
(Present
(Acc_Def
));
10172 Make_Object_Declaration
(Loc
,
10173 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10174 Constant_Present
=> True,
10175 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10176 Object_Definition
=> New_Copy_Tree
(Def
),
10177 Expression
=> Actual
);
10179 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10181 -- A generic formal object of a tagged type is defined to be
10182 -- aliased so the new constant must also be treated as aliased.
10184 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
10185 Set_Aliased_Present
(Decl_Node
);
10188 Append
(Decl_Node
, List
);
10190 -- No need to repeat (pre-)analysis of some expression nodes
10191 -- already handled in Preanalyze_Actuals.
10193 if Nkind
(Actual
) /= N_Allocator
then
10196 -- Return if the analysis of the actual reported some error
10198 if Etype
(Actual
) = Any_Type
then
10204 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
10208 Typ
:= Get_Instance_Of
(Formal_Type
);
10210 Freeze_Before
(Instantiation_Node
, Typ
);
10212 -- If the actual is an aggregate, perform name resolution on
10213 -- its components (the analysis of an aggregate does not do it)
10214 -- to capture local names that may be hidden if the generic is
10217 if Nkind
(Actual
) = N_Aggregate
then
10218 Preanalyze_And_Resolve
(Actual
, Typ
);
10221 if Is_Limited_Type
(Typ
)
10222 and then not OK_For_Limited_Init
(Typ
, Actual
)
10225 ("initialization not allowed for limited types", Actual
);
10226 Explain_Limited_Type
(Typ
, Actual
);
10230 elsif Present
(Default_Expression
(Formal
)) then
10232 -- Use default to construct declaration
10234 if Present
(Subt_Mark
) then
10236 else pragma Assert
(Present
(Acc_Def
));
10241 Make_Object_Declaration
(Sloc
(Formal
),
10242 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10243 Constant_Present
=> True,
10244 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10245 Object_Definition
=> New_Copy
(Def
),
10246 Expression
=> New_Copy_Tree
10247 (Default_Expression
(Formal
)));
10249 Append
(Decl_Node
, List
);
10250 Set_Analyzed
(Expression
(Decl_Node
), False);
10254 ("missing actual&",
10255 Instantiation_Node
, Gen_Obj
);
10256 Error_Msg_NE
("\in instantiation of & declared#",
10257 Instantiation_Node
, Scope
(A_Gen_Obj
));
10259 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
10261 -- Create dummy constant declaration so that instance can be
10262 -- analyzed, to minimize cascaded visibility errors.
10264 if Present
(Subt_Mark
) then
10266 else pragma Assert
(Present
(Acc_Def
));
10271 Make_Object_Declaration
(Loc
,
10272 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10273 Constant_Present
=> True,
10274 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10275 Object_Definition
=> New_Copy
(Def
),
10277 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
10278 Attribute_Name
=> Name_First
,
10279 Prefix
=> New_Copy
(Def
)));
10281 Append
(Decl_Node
, List
);
10284 Abandon_Instantiation
(Instantiation_Node
);
10289 if Nkind
(Actual
) in N_Has_Entity
then
10290 Actual_Decl
:= Parent
(Entity
(Actual
));
10293 -- Ada 2005 (AI-423): For a formal object declaration with a null
10294 -- exclusion or an access definition that has a null exclusion: If the
10295 -- actual matching the formal object declaration denotes a generic
10296 -- formal object of another generic unit G, and the instantiation
10297 -- containing the actual occurs within the body of G or within the body
10298 -- of a generic unit declared within the declarative region of G, then
10299 -- the declaration of the formal object of G must have a null exclusion.
10300 -- Otherwise, the subtype of the actual matching the formal object
10301 -- declaration shall exclude null.
10303 if Ada_Version
>= Ada_2005
10304 and then Present
(Actual_Decl
)
10306 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
10307 N_Object_Declaration
)
10308 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
10309 and then not Has_Null_Exclusion
(Actual_Decl
)
10310 and then Has_Null_Exclusion
(Analyzed_Formal
)
10312 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
10314 ("actual must exclude null to match generic formal#", Actual
);
10317 -- An effectively volatile object cannot be used as an actual in
10318 -- a generic instance. The following check is only relevant when
10319 -- SPARK_Mode is on as it is not a standard Ada legality rule.
10322 and then Present
(Actual
)
10323 and then Is_Effectively_Volatile_Object
(Actual
)
10326 ("volatile object cannot act as actual in generic instantiation "
10327 & "(SPARK RM 7.1.3(8))", Actual
);
10331 end Instantiate_Object
;
10333 ------------------------------
10334 -- Instantiate_Package_Body --
10335 ------------------------------
10337 procedure Instantiate_Package_Body
10338 (Body_Info
: Pending_Body_Info
;
10339 Inlined_Body
: Boolean := False;
10340 Body_Optional
: Boolean := False)
10342 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
10343 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
10344 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
10346 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
10347 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
10348 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
10349 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
10350 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
10352 Act_Body_Name
: Node_Id
;
10353 Gen_Body
: Node_Id
;
10354 Gen_Body_Id
: Node_Id
;
10355 Act_Body
: Node_Id
;
10356 Act_Body_Id
: Entity_Id
;
10358 Parent_Installed
: Boolean := False;
10359 Save_Style_Check
: constant Boolean := Style_Check
;
10361 Par_Ent
: Entity_Id
:= Empty
;
10362 Par_Vis
: Boolean := False;
10364 Vis_Prims_List
: Elist_Id
:= No_Elist
;
10365 -- List of primitives made temporarily visible in the instantiation
10366 -- to match the visibility of the formal type
10368 procedure Check_Initialized_Types
;
10369 -- In a generic package body, an entity of a generic private type may
10370 -- appear uninitialized. This is suspicious, unless the actual is a
10371 -- fully initialized type.
10373 -----------------------------
10374 -- Check_Initialized_Types --
10375 -----------------------------
10377 procedure Check_Initialized_Types
is
10379 Formal
: Entity_Id
;
10380 Actual
: Entity_Id
;
10381 Uninit_Var
: Entity_Id
;
10384 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
10385 while Present
(Decl
) loop
10386 Uninit_Var
:= Empty
;
10388 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
10389 Uninit_Var
:= Uninitialized_Variable
(Decl
);
10391 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
10392 and then Nkind
(Formal_Type_Definition
(Decl
)) =
10393 N_Formal_Private_Type_Definition
10396 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
10399 if Present
(Uninit_Var
) then
10400 Formal
:= Defining_Identifier
(Decl
);
10401 Actual
:= First_Entity
(Act_Decl_Id
);
10403 -- For each formal there is a subtype declaration that renames
10404 -- the actual and has the same name as the formal. Locate the
10405 -- formal for warning message about uninitialized variables
10406 -- in the generic, for which the actual type should be a fully
10407 -- initialized type.
10409 while Present
(Actual
) loop
10410 exit when Ekind
(Actual
) = E_Package
10411 and then Present
(Renamed_Object
(Actual
));
10413 if Chars
(Actual
) = Chars
(Formal
)
10414 and then not Is_Scalar_Type
(Actual
)
10415 and then not Is_Fully_Initialized_Type
(Actual
)
10416 and then Warn_On_No_Value_Assigned
10418 Error_Msg_Node_2
:= Formal
;
10420 ("generic unit has uninitialized variable& of "
10421 & "formal private type &?v?", Actual
, Uninit_Var
);
10423 ("actual type for& should be fully initialized type?v?",
10428 Next_Entity
(Actual
);
10434 end Check_Initialized_Types
;
10436 -- Start of processing for Instantiate_Package_Body
10439 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10441 -- The instance body may already have been processed, as the parent of
10442 -- another instance that is inlined (Load_Parent_Of_Generic).
10444 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
10448 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
10450 -- Re-establish the state of information on which checks are suppressed.
10451 -- This information was set in Body_Info at the point of instantiation,
10452 -- and now we restore it so that the instance is compiled using the
10453 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10455 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
10456 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
10457 Opt
.Ada_Version
:= Body_Info
.Version
;
10458 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
10459 Restore_Warnings
(Body_Info
.Warnings
);
10460 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
10461 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
10463 if No
(Gen_Body_Id
) then
10465 -- Do not look for parent of generic body if none is required.
10466 -- This may happen when the routine is called as part of the
10467 -- Pending_Instantiations processing, when nested instances
10468 -- may precede the one generated from the main unit.
10470 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
10471 and then Body_Optional
10475 Load_Parent_Of_Generic
10476 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
10477 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10481 -- Establish global variable for sloc adjustment and for error recovery
10483 Instantiation_Node
:= Inst_Node
;
10485 if Present
(Gen_Body_Id
) then
10486 Save_Env
(Gen_Unit
, Act_Decl_Id
);
10487 Style_Check
:= False;
10488 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
10490 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
10492 Create_Instantiation_Source
10493 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
10497 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
10499 -- Build new name (possibly qualified) for body declaration
10501 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
10503 -- Some attributes of spec entity are not inherited by body entity
10505 Set_Handler_Records
(Act_Body_Id
, No_List
);
10507 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
10508 N_Defining_Program_Unit_Name
10511 Make_Defining_Program_Unit_Name
(Loc
,
10512 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
10513 Defining_Identifier
=> Act_Body_Id
);
10515 Act_Body_Name
:= Act_Body_Id
;
10518 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
10520 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
10521 Check_Generic_Actuals
(Act_Decl_Id
, False);
10522 Check_Initialized_Types
;
10524 -- Install primitives hidden at the point of the instantiation but
10525 -- visible when processing the generic formals
10531 E
:= First_Entity
(Act_Decl_Id
);
10532 while Present
(E
) loop
10534 and then Is_Generic_Actual_Type
(E
)
10535 and then Is_Tagged_Type
(E
)
10537 Install_Hidden_Primitives
10538 (Prims_List
=> Vis_Prims_List
,
10539 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
10547 -- If it is a child unit, make the parent instance (which is an
10548 -- instance of the parent of the generic) visible. The parent
10549 -- instance is the prefix of the name of the generic unit.
10551 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10552 and then Nkind
(Gen_Id
) = N_Expanded_Name
10554 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10555 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10556 Install_Parent
(Par_Ent
, In_Body
=> True);
10557 Parent_Installed
:= True;
10559 elsif Is_Child_Unit
(Gen_Unit
) then
10560 Par_Ent
:= Scope
(Gen_Unit
);
10561 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10562 Install_Parent
(Par_Ent
, In_Body
=> True);
10563 Parent_Installed
:= True;
10566 -- If the instantiation is a library unit, and this is the main unit,
10567 -- then build the resulting compilation unit nodes for the instance.
10568 -- If this is a compilation unit but it is not the main unit, then it
10569 -- is the body of a unit in the context, that is being compiled
10570 -- because it is encloses some inlined unit or another generic unit
10571 -- being instantiated. In that case, this body is not part of the
10572 -- current compilation, and is not attached to the tree, but its
10573 -- parent must be set for analysis.
10575 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10577 -- Replace instance node with body of instance, and create new
10578 -- node for corresponding instance declaration.
10580 Build_Instance_Compilation_Unit_Nodes
10581 (Inst_Node
, Act_Body
, Act_Decl
);
10582 Analyze
(Inst_Node
);
10584 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10586 -- If the instance is a child unit itself, then set the scope
10587 -- of the expanded body to be the parent of the instantiation
10588 -- (ensuring that the fully qualified name will be generated
10589 -- for the elaboration subprogram).
10591 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
10592 N_Defining_Program_Unit_Name
10595 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
10599 -- Case where instantiation is not a library unit
10602 -- If this is an early instantiation, i.e. appears textually
10603 -- before the corresponding body and must be elaborated first,
10604 -- indicate that the body instance is to be delayed.
10606 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
10608 -- Now analyze the body. We turn off all checks if this is an
10609 -- internal unit, since there is no reason to have checks on for
10610 -- any predefined run-time library code. All such code is designed
10611 -- to be compiled with checks off.
10613 -- Note that we do NOT apply this criterion to children of GNAT
10614 -- The latter units must suppress checks explicitly if needed.
10616 if Is_Predefined_File_Name
10617 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
10619 Analyze
(Act_Body
, Suppress
=> All_Checks
);
10621 Analyze
(Act_Body
);
10625 Inherit_Context
(Gen_Body
, Inst_Node
);
10627 -- Remove the parent instances if they have been placed on the scope
10628 -- stack to compile the body.
10630 if Parent_Installed
then
10631 Remove_Parent
(In_Body
=> True);
10633 -- Restore the previous visibility of the parent
10635 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10638 Restore_Hidden_Primitives
(Vis_Prims_List
);
10639 Restore_Private_Views
(Act_Decl_Id
);
10641 -- Remove the current unit from visibility if this is an instance
10642 -- that is not elaborated on the fly for inlining purposes.
10644 if not Inlined_Body
then
10645 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
10649 Style_Check
:= Save_Style_Check
;
10651 -- If we have no body, and the unit requires a body, then complain. This
10652 -- complaint is suppressed if we have detected other errors (since a
10653 -- common reason for missing the body is that it had errors).
10654 -- In CodePeer mode, a warning has been emitted already, no need for
10655 -- further messages.
10657 elsif Unit_Requires_Body
(Gen_Unit
)
10658 and then not Body_Optional
10660 if CodePeer_Mode
then
10663 elsif Serious_Errors_Detected
= 0 then
10665 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
10667 -- Don't attempt to perform any cleanup actions if some other error
10668 -- was already detected, since this can cause blowups.
10674 -- Case of package that does not need a body
10677 -- If the instantiation of the declaration is a library unit, rewrite
10678 -- the original package instantiation as a package declaration in the
10679 -- compilation unit node.
10681 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10682 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
10683 Rewrite
(Inst_Node
, Act_Decl
);
10685 -- Generate elaboration entity, in case spec has elaboration code.
10686 -- This cannot be done when the instance is analyzed, because it
10687 -- is not known yet whether the body exists.
10689 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
10690 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
10692 -- If the instantiation is not a library unit, then append the
10693 -- declaration to the list of implicitly generated entities, unless
10694 -- it is already a list member which means that it was already
10697 elsif not Is_List_Member
(Act_Decl
) then
10698 Mark_Rewrite_Insertion
(Act_Decl
);
10699 Insert_Before
(Inst_Node
, Act_Decl
);
10703 Expander_Mode_Restore
;
10704 end Instantiate_Package_Body
;
10706 ---------------------------------
10707 -- Instantiate_Subprogram_Body --
10708 ---------------------------------
10710 procedure Instantiate_Subprogram_Body
10711 (Body_Info
: Pending_Body_Info
;
10712 Body_Optional
: Boolean := False)
10714 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
10715 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
10716 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
10717 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
10718 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
10719 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
10720 Anon_Id
: constant Entity_Id
:=
10721 Defining_Unit_Name
(Specification
(Act_Decl
));
10722 Pack_Id
: constant Entity_Id
:=
10723 Defining_Unit_Name
(Parent
(Act_Decl
));
10725 Gen_Body
: Node_Id
;
10726 Gen_Body_Id
: Node_Id
;
10727 Act_Body
: Node_Id
;
10728 Pack_Body
: Node_Id
;
10729 Prev_Formal
: Entity_Id
;
10730 Ret_Expr
: Node_Id
;
10731 Unit_Renaming
: Node_Id
;
10733 Parent_Installed
: Boolean := False;
10735 Saved_Style_Check
: constant Boolean := Style_Check
;
10736 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
10738 Par_Ent
: Entity_Id
:= Empty
;
10739 Par_Vis
: Boolean := False;
10742 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10744 -- Subprogram body may have been created already because of an inline
10745 -- pragma, or because of multiple elaborations of the enclosing package
10746 -- when several instances of the subprogram appear in the main unit.
10748 if Present
(Corresponding_Body
(Act_Decl
)) then
10752 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
10754 -- Re-establish the state of information on which checks are suppressed.
10755 -- This information was set in Body_Info at the point of instantiation,
10756 -- and now we restore it so that the instance is compiled using the
10757 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10759 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
10760 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
10761 Opt
.Ada_Version
:= Body_Info
.Version
;
10762 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
10763 Restore_Warnings
(Body_Info
.Warnings
);
10764 Opt
.SPARK_Mode
:= Body_Info
.SPARK_Mode
;
10765 Opt
.SPARK_Mode_Pragma
:= Body_Info
.SPARK_Mode_Pragma
;
10767 if No
(Gen_Body_Id
) then
10769 -- For imported generic subprogram, no body to compile, complete
10770 -- the spec entity appropriately.
10772 if Is_Imported
(Gen_Unit
) then
10773 Set_Is_Imported
(Anon_Id
);
10774 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
10775 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
10776 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
10777 Set_Has_Completion
(Anon_Id
);
10780 -- For other cases, compile the body
10783 Load_Parent_Of_Generic
10784 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
10785 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
10789 Instantiation_Node
:= Inst_Node
;
10791 if Present
(Gen_Body_Id
) then
10792 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
10794 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
10796 -- Either body is not present, or context is non-expanding, as
10797 -- when compiling a subunit. Mark the instance as completed, and
10798 -- diagnose a missing body when needed.
10801 and then Operating_Mode
= Generate_Code
10804 ("missing proper body for instantiation", Gen_Body
);
10807 Set_Has_Completion
(Anon_Id
);
10811 Save_Env
(Gen_Unit
, Anon_Id
);
10812 Style_Check
:= False;
10813 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
10814 Create_Instantiation_Source
10822 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
10824 -- Create proper defining name for the body, to correspond to
10825 -- the one in the spec.
10827 Set_Defining_Unit_Name
(Specification
(Act_Body
),
10828 Make_Defining_Identifier
10829 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
10830 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
10831 Set_Has_Completion
(Anon_Id
);
10832 Check_Generic_Actuals
(Pack_Id
, False);
10834 -- Generate a reference to link the visible subprogram instance to
10835 -- the generic body, which for navigation purposes is the only
10836 -- available source for the instance.
10839 (Related_Instance
(Pack_Id
),
10840 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
10842 -- If it is a child unit, make the parent instance (which is an
10843 -- instance of the parent of the generic) visible. The parent
10844 -- instance is the prefix of the name of the generic unit.
10846 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
10847 and then Nkind
(Gen_Id
) = N_Expanded_Name
10849 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
10850 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10851 Install_Parent
(Par_Ent
, In_Body
=> True);
10852 Parent_Installed
:= True;
10854 elsif Is_Child_Unit
(Gen_Unit
) then
10855 Par_Ent
:= Scope
(Gen_Unit
);
10856 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
10857 Install_Parent
(Par_Ent
, In_Body
=> True);
10858 Parent_Installed
:= True;
10861 -- Inside its body, a reference to the generic unit is a reference
10862 -- to the instance. The corresponding renaming is the first
10863 -- declaration in the body.
10866 Make_Subprogram_Renaming_Declaration
(Loc
,
10868 Copy_Generic_Node
(
10869 Specification
(Original_Node
(Gen_Body
)),
10871 Instantiating
=> True),
10872 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
10874 -- If there is a formal subprogram with the same name as the unit
10875 -- itself, do not add this renaming declaration. This is a temporary
10876 -- fix for one ACVC test. ???
10878 Prev_Formal
:= First_Entity
(Pack_Id
);
10879 while Present
(Prev_Formal
) loop
10880 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
10881 and then Is_Overloadable
(Prev_Formal
)
10886 Next_Entity
(Prev_Formal
);
10889 if Present
(Prev_Formal
) then
10890 Decls
:= New_List
(Act_Body
);
10892 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
10895 -- The subprogram body is placed in the body of a dummy package body,
10896 -- whose spec contains the subprogram declaration as well as the
10897 -- renaming declarations for the generic parameters.
10899 Pack_Body
:= Make_Package_Body
(Loc
,
10900 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
10901 Declarations
=> Decls
);
10903 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
10905 -- If the instantiation is a library unit, then build resulting
10906 -- compilation unit nodes for the instance. The declaration of
10907 -- the enclosing package is the grandparent of the subprogram
10908 -- declaration. First replace the instantiation node as the unit
10909 -- of the corresponding compilation.
10911 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
10912 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
10913 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
10914 Build_Instance_Compilation_Unit_Nodes
10915 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
10916 Analyze
(Inst_Node
);
10918 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
10919 Analyze
(Pack_Body
);
10923 Insert_Before
(Inst_Node
, Pack_Body
);
10924 Mark_Rewrite_Insertion
(Pack_Body
);
10925 Analyze
(Pack_Body
);
10927 if Expander_Active
then
10928 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
10932 Inherit_Context
(Gen_Body
, Inst_Node
);
10934 Restore_Private_Views
(Pack_Id
, False);
10936 if Parent_Installed
then
10937 Remove_Parent
(In_Body
=> True);
10939 -- Restore the previous visibility of the parent
10941 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
10945 Style_Check
:= Saved_Style_Check
;
10946 Restore_Warnings
(Saved_Warnings
);
10948 -- Body not found. Error was emitted already. If there were no previous
10949 -- errors, this may be an instance whose scope is a premature instance.
10950 -- In that case we must insure that the (legal) program does raise
10951 -- program error if executed. We generate a subprogram body for this
10952 -- purpose. See DEC ac30vso.
10954 -- Should not reference proprietary DEC tests in comments ???
10956 elsif Serious_Errors_Detected
= 0
10957 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
10959 if Body_Optional
then
10962 elsif Ekind
(Anon_Id
) = E_Procedure
then
10964 Make_Subprogram_Body
(Loc
,
10966 Make_Procedure_Specification
(Loc
,
10967 Defining_Unit_Name
=>
10968 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10969 Parameter_Specifications
=>
10971 (Parameter_Specifications
(Parent
(Anon_Id
)))),
10973 Declarations
=> Empty_List
,
10974 Handled_Statement_Sequence
=>
10975 Make_Handled_Sequence_Of_Statements
(Loc
,
10978 Make_Raise_Program_Error
(Loc
,
10980 PE_Access_Before_Elaboration
))));
10984 Make_Raise_Program_Error
(Loc
,
10985 Reason
=> PE_Access_Before_Elaboration
);
10987 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
10988 Set_Analyzed
(Ret_Expr
);
10991 Make_Subprogram_Body
(Loc
,
10993 Make_Function_Specification
(Loc
,
10994 Defining_Unit_Name
=>
10995 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
10996 Parameter_Specifications
=>
10998 (Parameter_Specifications
(Parent
(Anon_Id
))),
10999 Result_Definition
=>
11000 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
11002 Declarations
=> Empty_List
,
11003 Handled_Statement_Sequence
=>
11004 Make_Handled_Sequence_Of_Statements
(Loc
,
11007 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
11010 Pack_Body
:= Make_Package_Body
(Loc
,
11011 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
11012 Declarations
=> New_List
(Act_Body
));
11014 Insert_After
(Inst_Node
, Pack_Body
);
11015 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
11016 Analyze
(Pack_Body
);
11019 Expander_Mode_Restore
;
11020 end Instantiate_Subprogram_Body
;
11022 ----------------------
11023 -- Instantiate_Type --
11024 ----------------------
11026 function Instantiate_Type
11029 Analyzed_Formal
: Node_Id
;
11030 Actual_Decls
: List_Id
) return List_Id
11032 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11033 A_Gen_T
: constant Entity_Id
:=
11034 Defining_Identifier
(Analyzed_Formal
);
11035 Ancestor
: Entity_Id
:= Empty
;
11036 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
11038 Decl_Node
: Node_Id
;
11039 Decl_Nodes
: List_Id
;
11043 procedure Diagnose_Predicated_Actual
;
11044 -- There are a number of constructs in which a discrete type with
11045 -- predicates is illegal, e.g. as an index in an array type declaration.
11046 -- If a generic type is used is such a construct in a generic package
11047 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
11048 -- of the generic contract that the actual cannot have predicates.
11050 procedure Validate_Array_Type_Instance
;
11051 procedure Validate_Access_Subprogram_Instance
;
11052 procedure Validate_Access_Type_Instance
;
11053 procedure Validate_Derived_Type_Instance
;
11054 procedure Validate_Derived_Interface_Type_Instance
;
11055 procedure Validate_Discriminated_Formal_Type
;
11056 procedure Validate_Interface_Type_Instance
;
11057 procedure Validate_Private_Type_Instance
;
11058 procedure Validate_Incomplete_Type_Instance
;
11059 -- These procedures perform validation tests for the named case.
11060 -- Validate_Discriminated_Formal_Type is shared by formal private
11061 -- types and Ada 2012 formal incomplete types.
11063 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
11064 -- Check that base types are the same and that the subtypes match
11065 -- statically. Used in several of the above.
11067 ---------------------------------
11068 -- Diagnose_Predicated_Actual --
11069 ---------------------------------
11071 procedure Diagnose_Predicated_Actual
is
11073 if No_Predicate_On_Actual
(A_Gen_T
)
11074 and then Has_Predicates
(Act_T
)
11077 ("actual for& cannot be a type with predicate",
11078 Instantiation_Node
, A_Gen_T
);
11080 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
11081 and then Has_Predicates
(Act_T
)
11082 and then not Has_Static_Predicate_Aspect
(Act_T
)
11085 ("actual for& cannot be a type with a dynamic predicate",
11086 Instantiation_Node
, A_Gen_T
);
11088 end Diagnose_Predicated_Actual
;
11090 --------------------
11091 -- Subtypes_Match --
11092 --------------------
11094 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
11095 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
11098 -- Some detailed comments would be useful here ???
11100 return ((Base_Type
(T
) = Act_T
11101 or else Base_Type
(T
) = Base_Type
(Act_T
))
11102 and then Subtypes_Statically_Match
(T
, Act_T
))
11104 or else (Is_Class_Wide_Type
(Gen_T
)
11105 and then Is_Class_Wide_Type
(Act_T
)
11106 and then Subtypes_Match
11107 (Get_Instance_Of
(Root_Type
(Gen_T
)),
11108 Root_Type
(Act_T
)))
11111 (Ekind_In
(Gen_T
, E_Anonymous_Access_Subprogram_Type
,
11112 E_Anonymous_Access_Type
)
11113 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
11114 and then Subtypes_Statically_Match
11115 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
11116 end Subtypes_Match
;
11118 -----------------------------------------
11119 -- Validate_Access_Subprogram_Instance --
11120 -----------------------------------------
11122 procedure Validate_Access_Subprogram_Instance
is
11124 if not Is_Access_Type
(Act_T
)
11125 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
11128 ("expect access type in instantiation of &", Actual
, Gen_T
);
11129 Abandon_Instantiation
(Actual
);
11132 -- According to AI05-288, actuals for access_to_subprograms must be
11133 -- subtype conformant with the generic formal. Previous to AI05-288
11134 -- only mode conformance was required.
11136 -- This is a binding interpretation that applies to previous versions
11137 -- of the language, no need to maintain previous weaker checks.
11139 Check_Subtype_Conformant
11140 (Designated_Type
(Act_T
),
11141 Designated_Type
(A_Gen_T
),
11145 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
11146 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
11148 ("protected access type not allowed for formal &",
11152 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
11154 ("expect protected access type for formal &",
11157 end Validate_Access_Subprogram_Instance
;
11159 -----------------------------------
11160 -- Validate_Access_Type_Instance --
11161 -----------------------------------
11163 procedure Validate_Access_Type_Instance
is
11164 Desig_Type
: constant Entity_Id
:=
11165 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
11166 Desig_Act
: Entity_Id
;
11169 if not Is_Access_Type
(Act_T
) then
11171 ("expect access type in instantiation of &", Actual
, Gen_T
);
11172 Abandon_Instantiation
(Actual
);
11175 if Is_Access_Constant
(A_Gen_T
) then
11176 if not Is_Access_Constant
(Act_T
) then
11178 ("actual type must be access-to-constant type", Actual
);
11179 Abandon_Instantiation
(Actual
);
11182 if Is_Access_Constant
(Act_T
) then
11184 ("actual type must be access-to-variable type", Actual
);
11185 Abandon_Instantiation
(Actual
);
11187 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
11188 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
11190 Error_Msg_N
-- CODEFIX
11191 ("actual must be general access type!", Actual
);
11192 Error_Msg_NE
-- CODEFIX
11193 ("add ALL to }!", Actual
, Act_T
);
11194 Abandon_Instantiation
(Actual
);
11198 -- The designated subtypes, that is to say the subtypes introduced
11199 -- by an access type declaration (and not by a subtype declaration)
11202 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
11204 -- The designated type may have been introduced through a limited_
11205 -- with clause, in which case retrieve the non-limited view. This
11206 -- applies to incomplete types as well as to class-wide types.
11208 if From_Limited_With
(Desig_Act
) then
11209 Desig_Act
:= Available_View
(Desig_Act
);
11212 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
11214 ("designated type of actual does not match that of formal &",
11217 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
11218 Error_Msg_N
("\predicates do not match", Actual
);
11221 Abandon_Instantiation
(Actual
);
11223 elsif Is_Access_Type
(Designated_Type
(Act_T
))
11224 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
11226 Is_Constrained
(Designated_Type
(Desig_Type
))
11229 ("designated type of actual does not match that of formal &",
11232 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
11233 Error_Msg_N
("\predicates do not match", Actual
);
11236 Abandon_Instantiation
(Actual
);
11239 -- Ada 2005: null-exclusion indicators of the two types must agree
11241 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
11243 ("non null exclusion of actual and formal & do not match",
11246 end Validate_Access_Type_Instance
;
11248 ----------------------------------
11249 -- Validate_Array_Type_Instance --
11250 ----------------------------------
11252 procedure Validate_Array_Type_Instance
is
11257 function Formal_Dimensions
return Int
;
11258 -- Count number of dimensions in array type formal
11260 -----------------------
11261 -- Formal_Dimensions --
11262 -----------------------
11264 function Formal_Dimensions
return Int
is
11269 if Nkind
(Def
) = N_Constrained_Array_Definition
then
11270 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
11272 Index
:= First
(Subtype_Marks
(Def
));
11275 while Present
(Index
) loop
11277 Next_Index
(Index
);
11281 end Formal_Dimensions
;
11283 -- Start of processing for Validate_Array_Type_Instance
11286 if not Is_Array_Type
(Act_T
) then
11288 ("expect array type in instantiation of &", Actual
, Gen_T
);
11289 Abandon_Instantiation
(Actual
);
11291 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
11292 if not (Is_Constrained
(Act_T
)) then
11294 ("expect constrained array in instantiation of &",
11296 Abandon_Instantiation
(Actual
);
11300 if Is_Constrained
(Act_T
) then
11302 ("expect unconstrained array in instantiation of &",
11304 Abandon_Instantiation
(Actual
);
11308 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
11310 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
11311 Abandon_Instantiation
(Actual
);
11314 I1
:= First_Index
(A_Gen_T
);
11315 I2
:= First_Index
(Act_T
);
11316 for J
in 1 .. Formal_Dimensions
loop
11318 -- If the indexes of the actual were given by a subtype_mark,
11319 -- the index was transformed into a range attribute. Retrieve
11320 -- the original type mark for checking.
11322 if Is_Entity_Name
(Original_Node
(I2
)) then
11323 T2
:= Entity
(Original_Node
(I2
));
11328 if not Subtypes_Match
11329 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
11332 ("index types of actual do not match those of formal &",
11334 Abandon_Instantiation
(Actual
);
11341 -- Check matching subtypes. Note that there are complex visibility
11342 -- issues when the generic is a child unit and some aspect of the
11343 -- generic type is declared in a parent unit of the generic. We do
11344 -- the test to handle this special case only after a direct check
11345 -- for static matching has failed. The case where both the component
11346 -- type and the array type are separate formals, and the component
11347 -- type is a private view may also require special checking in
11351 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
11354 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
11355 Component_Type
(Act_T
))
11360 ("component subtype of actual does not match that of formal &",
11362 Abandon_Instantiation
(Actual
);
11365 if Has_Aliased_Components
(A_Gen_T
)
11366 and then not Has_Aliased_Components
(Act_T
)
11369 ("actual must have aliased components to match formal type &",
11372 end Validate_Array_Type_Instance
;
11374 -----------------------------------------------
11375 -- Validate_Derived_Interface_Type_Instance --
11376 -----------------------------------------------
11378 procedure Validate_Derived_Interface_Type_Instance
is
11379 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
11383 -- First apply interface instance checks
11385 Validate_Interface_Type_Instance
;
11387 -- Verify that immediate parent interface is an ancestor of
11391 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
11394 ("interface actual must include progenitor&", Actual
, Par
);
11397 -- Now verify that the actual includes all other ancestors of
11400 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
11401 while Present
(Elmt
) loop
11402 if not Interface_Present_In_Ancestor
11403 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
11406 ("interface actual must include progenitor&",
11407 Actual
, Node
(Elmt
));
11412 end Validate_Derived_Interface_Type_Instance
;
11414 ------------------------------------
11415 -- Validate_Derived_Type_Instance --
11416 ------------------------------------
11418 procedure Validate_Derived_Type_Instance
is
11419 Actual_Discr
: Entity_Id
;
11420 Ancestor_Discr
: Entity_Id
;
11423 -- If the parent type in the generic declaration is itself a previous
11424 -- formal type, then it is local to the generic and absent from the
11425 -- analyzed generic definition. In that case the ancestor is the
11426 -- instance of the formal (which must have been instantiated
11427 -- previously), unless the ancestor is itself a formal derived type.
11428 -- In this latter case (which is the subject of Corrigendum 8652/0038
11429 -- (AI-202) the ancestor of the formals is the ancestor of its
11430 -- parent. Otherwise, the analyzed generic carries the parent type.
11431 -- If the parent type is defined in a previous formal package, then
11432 -- the scope of that formal package is that of the generic type
11433 -- itself, and it has already been mapped into the corresponding type
11434 -- in the actual package.
11436 -- Common case: parent type defined outside of the generic
11438 if Is_Entity_Name
(Subtype_Mark
(Def
))
11439 and then Present
(Entity
(Subtype_Mark
(Def
)))
11441 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
11443 -- Check whether parent is defined in a previous formal package
11446 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
11449 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
11451 -- The type may be a local derivation, or a type extension of a
11452 -- previous formal, or of a formal of a parent package.
11454 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
11456 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
11458 -- Check whether the parent is another derived formal type in the
11459 -- same generic unit.
11461 if Etype
(A_Gen_T
) /= A_Gen_T
11462 and then Is_Generic_Type
(Etype
(A_Gen_T
))
11463 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
11464 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
11466 -- Locate ancestor of parent from the subtype declaration
11467 -- created for the actual.
11473 Decl
:= First
(Actual_Decls
);
11474 while Present
(Decl
) loop
11475 if Nkind
(Decl
) = N_Subtype_Declaration
11476 and then Chars
(Defining_Identifier
(Decl
)) =
11477 Chars
(Etype
(A_Gen_T
))
11479 Ancestor
:= Generic_Parent_Type
(Decl
);
11487 pragma Assert
(Present
(Ancestor
));
11489 -- The ancestor itself may be a previous formal that has been
11492 Ancestor
:= Get_Instance_Of
(Ancestor
);
11496 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
11499 -- An unusual case: the actual is a type declared in a parent unit,
11500 -- but is not a formal type so there is no instance_of for it.
11501 -- Retrieve it by analyzing the record extension.
11503 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
11504 and then In_Open_Scopes
(Scope
(Act_T
))
11505 and then Is_Generic_Instance
(Scope
(Act_T
))
11507 Analyze
(Subtype_Mark
(Def
));
11508 Ancestor
:= Entity
(Subtype_Mark
(Def
));
11511 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
11514 -- If the formal derived type has pragma Preelaborable_Initialization
11515 -- then the actual type must have preelaborable initialization.
11517 if Known_To_Have_Preelab_Init
(A_Gen_T
)
11518 and then not Has_Preelaborable_Initialization
(Act_T
)
11521 ("actual for & must have preelaborable initialization",
11525 -- Ada 2005 (AI-251)
11527 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
11528 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
11530 ("(Ada 2005) expected type implementing & in instantiation",
11534 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
11536 ("expect type derived from & in instantiation",
11537 Actual
, First_Subtype
(Ancestor
));
11538 Abandon_Instantiation
(Actual
);
11541 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
11542 -- that the formal type declaration has been rewritten as a private
11545 if Ada_Version
>= Ada_2005
11546 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
11547 and then Synchronized_Present
(Parent
(A_Gen_T
))
11549 -- The actual must be a synchronized tagged type
11551 if not Is_Tagged_Type
(Act_T
) then
11553 ("actual of synchronized type must be tagged", Actual
);
11554 Abandon_Instantiation
(Actual
);
11556 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
11557 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
11558 N_Derived_Type_Definition
11559 and then not Synchronized_Present
(Type_Definition
11563 ("actual of synchronized type must be synchronized", Actual
);
11564 Abandon_Instantiation
(Actual
);
11568 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
11569 -- removes the second instance of the phrase "or allow pass by copy".
11571 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
11573 ("cannot have atomic actual type for non-atomic formal type",
11576 elsif Is_Volatile
(Act_T
) and then not Is_Volatile
(Ancestor
) then
11578 ("cannot have volatile actual type for non-volatile formal type",
11582 -- It should not be necessary to check for unknown discriminants on
11583 -- Formal, but for some reason Has_Unknown_Discriminants is false for
11584 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
11585 -- needs fixing. ???
11587 if not Is_Indefinite_Subtype
(A_Gen_T
)
11588 and then not Unknown_Discriminants_Present
(Formal
)
11589 and then Is_Indefinite_Subtype
(Act_T
)
11592 ("actual subtype must be constrained", Actual
);
11593 Abandon_Instantiation
(Actual
);
11596 if not Unknown_Discriminants_Present
(Formal
) then
11597 if Is_Constrained
(Ancestor
) then
11598 if not Is_Constrained
(Act_T
) then
11600 ("actual subtype must be constrained", Actual
);
11601 Abandon_Instantiation
(Actual
);
11604 -- Ancestor is unconstrained, Check if generic formal and actual
11605 -- agree on constrainedness. The check only applies to array types
11606 -- and discriminated types.
11608 elsif Is_Constrained
(Act_T
) then
11609 if Ekind
(Ancestor
) = E_Access_Type
11610 or else (not Is_Constrained
(A_Gen_T
)
11611 and then Is_Composite_Type
(A_Gen_T
))
11613 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
11614 Abandon_Instantiation
(Actual
);
11617 -- A class-wide type is only allowed if the formal has unknown
11620 elsif Is_Class_Wide_Type
(Act_T
)
11621 and then not Has_Unknown_Discriminants
(Ancestor
)
11624 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
11625 Abandon_Instantiation
(Actual
);
11627 -- Otherwise, the formal and actual must have the same number
11628 -- of discriminants and each discriminant of the actual must
11629 -- correspond to a discriminant of the formal.
11631 elsif Has_Discriminants
(Act_T
)
11632 and then not Has_Unknown_Discriminants
(Act_T
)
11633 and then Has_Discriminants
(Ancestor
)
11635 Actual_Discr
:= First_Discriminant
(Act_T
);
11636 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
11637 while Present
(Actual_Discr
)
11638 and then Present
(Ancestor_Discr
)
11640 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
11641 No
(Corresponding_Discriminant
(Actual_Discr
))
11644 ("discriminant & does not correspond " &
11645 "to ancestor discriminant", Actual
, Actual_Discr
);
11646 Abandon_Instantiation
(Actual
);
11649 Next_Discriminant
(Actual_Discr
);
11650 Next_Discriminant
(Ancestor_Discr
);
11653 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
11655 ("actual for & must have same number of discriminants",
11657 Abandon_Instantiation
(Actual
);
11660 -- This case should be caught by the earlier check for
11661 -- constrainedness, but the check here is added for completeness.
11663 elsif Has_Discriminants
(Act_T
)
11664 and then not Has_Unknown_Discriminants
(Act_T
)
11667 ("actual for & must not have discriminants", Actual
, Gen_T
);
11668 Abandon_Instantiation
(Actual
);
11670 elsif Has_Discriminants
(Ancestor
) then
11672 ("actual for & must have known discriminants", Actual
, Gen_T
);
11673 Abandon_Instantiation
(Actual
);
11676 if not Subtypes_Statically_Compatible
11677 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
11680 ("constraint on actual is incompatible with formal", Actual
);
11681 Abandon_Instantiation
(Actual
);
11685 -- If the formal and actual types are abstract, check that there
11686 -- are no abstract primitives of the actual type that correspond to
11687 -- nonabstract primitives of the formal type (second sentence of
11690 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
11691 Check_Abstract_Primitives
: declare
11692 Gen_Prims
: constant Elist_Id
:=
11693 Primitive_Operations
(A_Gen_T
);
11694 Gen_Elmt
: Elmt_Id
;
11695 Gen_Subp
: Entity_Id
;
11696 Anc_Subp
: Entity_Id
;
11697 Anc_Formal
: Entity_Id
;
11698 Anc_F_Type
: Entity_Id
;
11700 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
11701 Act_Elmt
: Elmt_Id
;
11702 Act_Subp
: Entity_Id
;
11703 Act_Formal
: Entity_Id
;
11704 Act_F_Type
: Entity_Id
;
11706 Subprograms_Correspond
: Boolean;
11708 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
11709 -- Returns true if T2 is derived directly or indirectly from
11710 -- T1, including derivations from interfaces. T1 and T2 are
11711 -- required to be specific tagged base types.
11713 ------------------------
11714 -- Is_Tagged_Ancestor --
11715 ------------------------
11717 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
11719 Intfc_Elmt
: Elmt_Id
;
11722 -- The predicate is satisfied if the types are the same
11727 -- If we've reached the top of the derivation chain then
11728 -- we know that T1 is not an ancestor of T2.
11730 elsif Etype
(T2
) = T2
then
11733 -- Proceed to check T2's immediate parent
11735 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
11738 -- Finally, check to see if T1 is an ancestor of any of T2's
11742 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
11743 while Present
(Intfc_Elmt
) loop
11744 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
11748 Next_Elmt
(Intfc_Elmt
);
11753 end Is_Tagged_Ancestor
;
11755 -- Start of processing for Check_Abstract_Primitives
11758 -- Loop over all of the formal derived type's primitives
11760 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
11761 while Present
(Gen_Elmt
) loop
11762 Gen_Subp
:= Node
(Gen_Elmt
);
11764 -- If the primitive of the formal is not abstract, then
11765 -- determine whether there is a corresponding primitive of
11766 -- the actual type that's abstract.
11768 if not Is_Abstract_Subprogram
(Gen_Subp
) then
11769 Act_Elmt
:= First_Elmt
(Act_Prims
);
11770 while Present
(Act_Elmt
) loop
11771 Act_Subp
:= Node
(Act_Elmt
);
11773 -- If we find an abstract primitive of the actual,
11774 -- then we need to test whether it corresponds to the
11775 -- subprogram from which the generic formal primitive
11778 if Is_Abstract_Subprogram
(Act_Subp
) then
11779 Anc_Subp
:= Alias
(Gen_Subp
);
11781 -- Test whether we have a corresponding primitive
11782 -- by comparing names, kinds, formal types, and
11785 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
11786 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
11788 Anc_Formal
:= First_Formal
(Anc_Subp
);
11789 Act_Formal
:= First_Formal
(Act_Subp
);
11790 while Present
(Anc_Formal
)
11791 and then Present
(Act_Formal
)
11793 Anc_F_Type
:= Etype
(Anc_Formal
);
11794 Act_F_Type
:= Etype
(Act_Formal
);
11796 if Ekind
(Anc_F_Type
)
11797 = E_Anonymous_Access_Type
11799 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
11801 if Ekind
(Act_F_Type
)
11802 = E_Anonymous_Access_Type
11805 Designated_Type
(Act_F_Type
);
11811 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
11816 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11817 Act_F_Type
:= Base_Type
(Act_F_Type
);
11819 -- If the formal is controlling, then the
11820 -- the type of the actual primitive's formal
11821 -- must be derived directly or indirectly
11822 -- from the type of the ancestor primitive's
11825 if Is_Controlling_Formal
(Anc_Formal
) then
11826 if not Is_Tagged_Ancestor
11827 (Anc_F_Type
, Act_F_Type
)
11832 -- Otherwise the types of the formals must
11835 elsif Anc_F_Type
/= Act_F_Type
then
11839 Next_Entity
(Anc_Formal
);
11840 Next_Entity
(Act_Formal
);
11843 -- If we traversed through all of the formals
11844 -- then so far the subprograms correspond, so
11845 -- now check that any result types correspond.
11847 if No
(Anc_Formal
) and then No
(Act_Formal
) then
11848 Subprograms_Correspond
:= True;
11850 if Ekind
(Act_Subp
) = E_Function
then
11851 Anc_F_Type
:= Etype
(Anc_Subp
);
11852 Act_F_Type
:= Etype
(Act_Subp
);
11854 if Ekind
(Anc_F_Type
)
11855 = E_Anonymous_Access_Type
11858 Designated_Type
(Anc_F_Type
);
11860 if Ekind
(Act_F_Type
)
11861 = E_Anonymous_Access_Type
11864 Designated_Type
(Act_F_Type
);
11866 Subprograms_Correspond
:= False;
11871 = E_Anonymous_Access_Type
11873 Subprograms_Correspond
:= False;
11876 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
11877 Act_F_Type
:= Base_Type
(Act_F_Type
);
11879 -- Now either the result types must be
11880 -- the same or, if the result type is
11881 -- controlling, the result type of the
11882 -- actual primitive must descend from the
11883 -- result type of the ancestor primitive.
11885 if Subprograms_Correspond
11886 and then Anc_F_Type
/= Act_F_Type
11888 Has_Controlling_Result
(Anc_Subp
)
11890 not Is_Tagged_Ancestor
11891 (Anc_F_Type
, Act_F_Type
)
11893 Subprograms_Correspond
:= False;
11897 -- Found a matching subprogram belonging to
11898 -- formal ancestor type, so actual subprogram
11899 -- corresponds and this violates 3.9.3(9).
11901 if Subprograms_Correspond
then
11903 ("abstract subprogram & overrides " &
11904 "nonabstract subprogram of ancestor",
11912 Next_Elmt
(Act_Elmt
);
11916 Next_Elmt
(Gen_Elmt
);
11918 end Check_Abstract_Primitives
;
11921 -- Verify that limitedness matches. If parent is a limited
11922 -- interface then the generic formal is not unless declared
11923 -- explicitly so. If not declared limited, the actual cannot be
11924 -- limited (see AI05-0087).
11926 -- Even though this AI is a binding interpretation, we enable the
11927 -- check only in Ada 2012 mode, because this improper construct
11928 -- shows up in user code and in existing B-tests.
11930 if Is_Limited_Type
(Act_T
)
11931 and then not Is_Limited_Type
(A_Gen_T
)
11932 and then Ada_Version
>= Ada_2012
11934 if In_Instance
then
11938 ("actual for non-limited & cannot be a limited type", Actual
,
11940 Explain_Limited_Type
(Act_T
, Actual
);
11941 Abandon_Instantiation
(Actual
);
11944 end Validate_Derived_Type_Instance
;
11946 ----------------------------------------
11947 -- Validate_Discriminated_Formal_Type --
11948 ----------------------------------------
11950 procedure Validate_Discriminated_Formal_Type
is
11951 Formal_Discr
: Entity_Id
;
11952 Actual_Discr
: Entity_Id
;
11953 Formal_Subt
: Entity_Id
;
11956 if Has_Discriminants
(A_Gen_T
) then
11957 if not Has_Discriminants
(Act_T
) then
11959 ("actual for & must have discriminants", Actual
, Gen_T
);
11960 Abandon_Instantiation
(Actual
);
11962 elsif Is_Constrained
(Act_T
) then
11964 ("actual for & must be unconstrained", Actual
, Gen_T
);
11965 Abandon_Instantiation
(Actual
);
11968 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
11969 Actual_Discr
:= First_Discriminant
(Act_T
);
11970 while Formal_Discr
/= Empty
loop
11971 if Actual_Discr
= Empty
then
11973 ("discriminants on actual do not match formal",
11975 Abandon_Instantiation
(Actual
);
11978 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
11980 -- Access discriminants match if designated types do
11982 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
11983 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
11984 E_Anonymous_Access_Type
11987 (Designated_Type
(Base_Type
(Formal_Subt
))) =
11988 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
11992 elsif Base_Type
(Formal_Subt
) /=
11993 Base_Type
(Etype
(Actual_Discr
))
11996 ("types of actual discriminants must match formal",
11998 Abandon_Instantiation
(Actual
);
12000 elsif not Subtypes_Statically_Match
12001 (Formal_Subt
, Etype
(Actual_Discr
))
12002 and then Ada_Version
>= Ada_95
12005 ("subtypes of actual discriminants must match formal",
12007 Abandon_Instantiation
(Actual
);
12010 Next_Discriminant
(Formal_Discr
);
12011 Next_Discriminant
(Actual_Discr
);
12014 if Actual_Discr
/= Empty
then
12016 ("discriminants on actual do not match formal",
12018 Abandon_Instantiation
(Actual
);
12022 end Validate_Discriminated_Formal_Type
;
12024 ---------------------------------------
12025 -- Validate_Incomplete_Type_Instance --
12026 ---------------------------------------
12028 procedure Validate_Incomplete_Type_Instance
is
12030 if not Is_Tagged_Type
(Act_T
)
12031 and then Is_Tagged_Type
(A_Gen_T
)
12034 ("actual for & must be a tagged type", Actual
, Gen_T
);
12037 Validate_Discriminated_Formal_Type
;
12038 end Validate_Incomplete_Type_Instance
;
12040 --------------------------------------
12041 -- Validate_Interface_Type_Instance --
12042 --------------------------------------
12044 procedure Validate_Interface_Type_Instance
is
12046 if not Is_Interface
(Act_T
) then
12048 ("actual for formal interface type must be an interface",
12051 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
12052 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
12053 or else Is_Protected_Interface
(A_Gen_T
) /=
12054 Is_Protected_Interface
(Act_T
)
12055 or else Is_Synchronized_Interface
(A_Gen_T
) /=
12056 Is_Synchronized_Interface
(Act_T
)
12059 ("actual for interface& does not match (RM 12.5.5(4))",
12062 end Validate_Interface_Type_Instance
;
12064 ------------------------------------
12065 -- Validate_Private_Type_Instance --
12066 ------------------------------------
12068 procedure Validate_Private_Type_Instance
is
12070 if Is_Limited_Type
(Act_T
)
12071 and then not Is_Limited_Type
(A_Gen_T
)
12073 if In_Instance
then
12077 ("actual for non-limited & cannot be a limited type", Actual
,
12079 Explain_Limited_Type
(Act_T
, Actual
);
12080 Abandon_Instantiation
(Actual
);
12083 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
12084 and then not Has_Preelaborable_Initialization
(Act_T
)
12087 ("actual for & must have preelaborable initialization", Actual
,
12090 elsif Is_Indefinite_Subtype
(Act_T
)
12091 and then not Is_Indefinite_Subtype
(A_Gen_T
)
12092 and then Ada_Version
>= Ada_95
12095 ("actual for & must be a definite subtype", Actual
, Gen_T
);
12097 elsif not Is_Tagged_Type
(Act_T
)
12098 and then Is_Tagged_Type
(A_Gen_T
)
12101 ("actual for & must be a tagged type", Actual
, Gen_T
);
12104 Validate_Discriminated_Formal_Type
;
12106 end Validate_Private_Type_Instance
;
12108 -- Start of processing for Instantiate_Type
12111 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
12112 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
12113 return New_List
(Error
);
12115 elsif not Is_Entity_Name
(Actual
)
12116 or else not Is_Type
(Entity
(Actual
))
12119 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
12120 Abandon_Instantiation
(Actual
);
12123 Act_T
:= Entity
(Actual
);
12125 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
12126 -- as a generic actual parameter if the corresponding formal type
12127 -- does not have a known_discriminant_part, or is a formal derived
12128 -- type that is an Unchecked_Union type.
12130 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
12131 if not Has_Discriminants
(A_Gen_T
)
12132 or else (Is_Derived_Type
(A_Gen_T
)
12133 and then Is_Unchecked_Union
(A_Gen_T
))
12137 Error_Msg_N
("unchecked union cannot be the actual for a "
12138 & "discriminated formal type", Act_T
);
12143 -- Deal with fixed/floating restrictions
12145 if Is_Floating_Point_Type
(Act_T
) then
12146 Check_Restriction
(No_Floating_Point
, Actual
);
12147 elsif Is_Fixed_Point_Type
(Act_T
) then
12148 Check_Restriction
(No_Fixed_Point
, Actual
);
12151 -- Deal with error of using incomplete type as generic actual.
12152 -- This includes limited views of a type, even if the non-limited
12153 -- view may be available.
12155 if Ekind
(Act_T
) = E_Incomplete_Type
12156 or else (Is_Class_Wide_Type
(Act_T
)
12157 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
12159 -- If the formal is an incomplete type, the actual can be
12160 -- incomplete as well.
12162 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
12165 elsif Is_Class_Wide_Type
(Act_T
)
12166 or else No
(Full_View
(Act_T
))
12168 Error_Msg_N
("premature use of incomplete type", Actual
);
12169 Abandon_Instantiation
(Actual
);
12171 Act_T
:= Full_View
(Act_T
);
12172 Set_Entity
(Actual
, Act_T
);
12174 if Has_Private_Component
(Act_T
) then
12176 ("premature use of type with private component", Actual
);
12180 -- Deal with error of premature use of private type as generic actual
12182 elsif Is_Private_Type
(Act_T
)
12183 and then Is_Private_Type
(Base_Type
(Act_T
))
12184 and then not Is_Generic_Type
(Act_T
)
12185 and then not Is_Derived_Type
(Act_T
)
12186 and then No
(Full_View
(Root_Type
(Act_T
)))
12188 -- If the formal is an incomplete type, the actual can be
12189 -- private or incomplete as well.
12191 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
12194 Error_Msg_N
("premature use of private type", Actual
);
12197 elsif Has_Private_Component
(Act_T
) then
12199 ("premature use of type with private component", Actual
);
12202 Set_Instance_Of
(A_Gen_T
, Act_T
);
12204 -- If the type is generic, the class-wide type may also be used
12206 if Is_Tagged_Type
(A_Gen_T
)
12207 and then Is_Tagged_Type
(Act_T
)
12208 and then not Is_Class_Wide_Type
(A_Gen_T
)
12210 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
12211 Class_Wide_Type
(Act_T
));
12214 if not Is_Abstract_Type
(A_Gen_T
)
12215 and then Is_Abstract_Type
(Act_T
)
12218 ("actual of non-abstract formal cannot be abstract", Actual
);
12221 -- A generic scalar type is a first subtype for which we generate
12222 -- an anonymous base type. Indicate that the instance of this base
12223 -- is the base type of the actual.
12225 if Is_Scalar_Type
(A_Gen_T
) then
12226 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
12230 if Error_Posted
(Act_T
) then
12233 case Nkind
(Def
) is
12234 when N_Formal_Private_Type_Definition
=>
12235 Validate_Private_Type_Instance
;
12237 when N_Formal_Incomplete_Type_Definition
=>
12238 Validate_Incomplete_Type_Instance
;
12240 when N_Formal_Derived_Type_Definition
=>
12241 Validate_Derived_Type_Instance
;
12243 when N_Formal_Discrete_Type_Definition
=>
12244 if not Is_Discrete_Type
(Act_T
) then
12246 ("expect discrete type in instantiation of&",
12248 Abandon_Instantiation
(Actual
);
12251 Diagnose_Predicated_Actual
;
12253 when N_Formal_Signed_Integer_Type_Definition
=>
12254 if not Is_Signed_Integer_Type
(Act_T
) then
12256 ("expect signed integer type in instantiation of&",
12258 Abandon_Instantiation
(Actual
);
12261 Diagnose_Predicated_Actual
;
12263 when N_Formal_Modular_Type_Definition
=>
12264 if not Is_Modular_Integer_Type
(Act_T
) then
12266 ("expect modular type in instantiation of &",
12268 Abandon_Instantiation
(Actual
);
12271 Diagnose_Predicated_Actual
;
12273 when N_Formal_Floating_Point_Definition
=>
12274 if not Is_Floating_Point_Type
(Act_T
) then
12276 ("expect float type in instantiation of &", Actual
, Gen_T
);
12277 Abandon_Instantiation
(Actual
);
12280 when N_Formal_Ordinary_Fixed_Point_Definition
=>
12281 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
12283 ("expect ordinary fixed point type in instantiation of &",
12285 Abandon_Instantiation
(Actual
);
12288 when N_Formal_Decimal_Fixed_Point_Definition
=>
12289 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
12291 ("expect decimal type in instantiation of &",
12293 Abandon_Instantiation
(Actual
);
12296 when N_Array_Type_Definition
=>
12297 Validate_Array_Type_Instance
;
12299 when N_Access_To_Object_Definition
=>
12300 Validate_Access_Type_Instance
;
12302 when N_Access_Function_Definition |
12303 N_Access_Procedure_Definition
=>
12304 Validate_Access_Subprogram_Instance
;
12306 when N_Record_Definition
=>
12307 Validate_Interface_Type_Instance
;
12309 when N_Derived_Type_Definition
=>
12310 Validate_Derived_Interface_Type_Instance
;
12313 raise Program_Error
;
12318 Subt
:= New_Copy
(Gen_T
);
12320 -- Use adjusted sloc of subtype name as the location for other nodes in
12321 -- the subtype declaration.
12323 Loc
:= Sloc
(Subt
);
12326 Make_Subtype_Declaration
(Loc
,
12327 Defining_Identifier
=> Subt
,
12328 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
12330 if Is_Private_Type
(Act_T
) then
12331 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
12333 elsif Is_Access_Type
(Act_T
)
12334 and then Is_Private_Type
(Designated_Type
(Act_T
))
12336 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
12339 Decl_Nodes
:= New_List
(Decl_Node
);
12341 -- Flag actual derived types so their elaboration produces the
12342 -- appropriate renamings for the primitive operations of the ancestor.
12343 -- Flag actual for formal private types as well, to determine whether
12344 -- operations in the private part may override inherited operations.
12345 -- If the formal has an interface list, the ancestor is not the
12346 -- parent, but the analyzed formal that includes the interface
12347 -- operations of all its progenitors.
12349 -- Same treatment for formal private types, so we can check whether the
12350 -- type is tagged limited when validating derivations in the private
12351 -- part. (See AI05-096).
12353 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
12354 if Present
(Interface_List
(Def
)) then
12355 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
12357 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
12360 elsif Nkind_In
(Def
,
12361 N_Formal_Private_Type_Definition
,
12362 N_Formal_Incomplete_Type_Definition
)
12364 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
12367 -- If the actual is a synchronized type that implements an interface,
12368 -- the primitive operations are attached to the corresponding record,
12369 -- and we have to treat it as an additional generic actual, so that its
12370 -- primitive operations become visible in the instance. The task or
12371 -- protected type itself does not carry primitive operations.
12373 if Is_Concurrent_Type
(Act_T
)
12374 and then Is_Tagged_Type
(Act_T
)
12375 and then Present
(Corresponding_Record_Type
(Act_T
))
12376 and then Present
(Ancestor
)
12377 and then Is_Interface
(Ancestor
)
12380 Corr_Rec
: constant Entity_Id
:=
12381 Corresponding_Record_Type
(Act_T
);
12382 New_Corr
: Entity_Id
;
12383 Corr_Decl
: Node_Id
;
12386 New_Corr
:= Make_Temporary
(Loc
, 'S');
12388 Make_Subtype_Declaration
(Loc
,
12389 Defining_Identifier
=> New_Corr
,
12390 Subtype_Indication
=>
12391 New_Occurrence_Of
(Corr_Rec
, Loc
));
12392 Append_To
(Decl_Nodes
, Corr_Decl
);
12394 if Ekind
(Act_T
) = E_Task_Type
then
12395 Set_Ekind
(Subt
, E_Task_Subtype
);
12397 Set_Ekind
(Subt
, E_Protected_Subtype
);
12400 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
12401 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
12402 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
12407 end Instantiate_Type
;
12409 ---------------------
12410 -- Is_In_Main_Unit --
12411 ---------------------
12413 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
12414 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
12415 Current_Unit
: Node_Id
;
12418 if Unum
= Main_Unit
then
12421 -- If the current unit is a subunit then it is either the main unit or
12422 -- is being compiled as part of the main unit.
12424 elsif Nkind
(N
) = N_Compilation_Unit
then
12425 return Nkind
(Unit
(N
)) = N_Subunit
;
12428 Current_Unit
:= Parent
(N
);
12429 while Present
(Current_Unit
)
12430 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
12432 Current_Unit
:= Parent
(Current_Unit
);
12435 -- The instantiation node is in the main unit, or else the current node
12436 -- (perhaps as the result of nested instantiations) is in the main unit,
12437 -- or in the declaration of the main unit, which in this last case must
12440 return Unum
= Main_Unit
12441 or else Current_Unit
= Cunit
(Main_Unit
)
12442 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
12443 or else (Present
(Library_Unit
(Current_Unit
))
12444 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
12445 end Is_In_Main_Unit
;
12447 ----------------------------
12448 -- Load_Parent_Of_Generic --
12449 ----------------------------
12451 procedure Load_Parent_Of_Generic
12454 Body_Optional
: Boolean := False)
12456 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
12457 Saved_Style_Check
: constant Boolean := Style_Check
;
12458 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
12459 True_Parent
: Node_Id
;
12460 Inst_Node
: Node_Id
;
12462 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
12464 procedure Collect_Previous_Instances
(Decls
: List_Id
);
12465 -- Collect all instantiations in the given list of declarations, that
12466 -- precede the generic that we need to load. If the bodies of these
12467 -- instantiations are available, we must analyze them, to ensure that
12468 -- the public symbols generated are the same when the unit is compiled
12469 -- to generate code, and when it is compiled in the context of a unit
12470 -- that needs a particular nested instance. This process is applied to
12471 -- both package and subprogram instances.
12473 --------------------------------
12474 -- Collect_Previous_Instances --
12475 --------------------------------
12477 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
12481 Decl
:= First
(Decls
);
12482 while Present
(Decl
) loop
12483 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
12486 -- If Decl is an instantiation, then record it as requiring
12487 -- instantiation of the corresponding body, except if it is an
12488 -- abbreviated instantiation generated internally for conformance
12489 -- checking purposes only for the case of a formal package
12490 -- declared without a box (see Instantiate_Formal_Package). Such
12491 -- an instantiation does not generate any code (the actual code
12492 -- comes from actual) and thus does not need to be analyzed here.
12493 -- If the instantiation appears with a generic package body it is
12494 -- not analyzed here either.
12496 elsif Nkind
(Decl
) = N_Package_Instantiation
12497 and then not Is_Internal
(Defining_Entity
(Decl
))
12499 Append_Elmt
(Decl
, Previous_Instances
);
12501 -- For a subprogram instantiation, omit instantiations intrinsic
12502 -- operations (Unchecked_Conversions, etc.) that have no bodies.
12504 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
12505 N_Procedure_Instantiation
)
12506 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
12508 Append_Elmt
(Decl
, Previous_Instances
);
12510 elsif Nkind
(Decl
) = N_Package_Declaration
then
12511 Collect_Previous_Instances
12512 (Visible_Declarations
(Specification
(Decl
)));
12513 Collect_Previous_Instances
12514 (Private_Declarations
(Specification
(Decl
)));
12516 -- Previous non-generic bodies may contain instances as well
12518 elsif Nkind
(Decl
) = N_Package_Body
12519 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
12521 Collect_Previous_Instances
(Declarations
(Decl
));
12523 elsif Nkind
(Decl
) = N_Subprogram_Body
12524 and then not Acts_As_Spec
(Decl
)
12525 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
12527 Collect_Previous_Instances
(Declarations
(Decl
));
12532 end Collect_Previous_Instances
;
12534 -- Start of processing for Load_Parent_Of_Generic
12537 if not In_Same_Source_Unit
(N
, Spec
)
12538 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
12539 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
12540 and then not Is_In_Main_Unit
(Spec
))
12542 -- Find body of parent of spec, and analyze it. A special case arises
12543 -- when the parent is an instantiation, that is to say when we are
12544 -- currently instantiating a nested generic. In that case, there is
12545 -- no separate file for the body of the enclosing instance. Instead,
12546 -- the enclosing body must be instantiated as if it were a pending
12547 -- instantiation, in order to produce the body for the nested generic
12548 -- we require now. Note that in that case the generic may be defined
12549 -- in a package body, the instance defined in the same package body,
12550 -- and the original enclosing body may not be in the main unit.
12552 Inst_Node
:= Empty
;
12554 True_Parent
:= Parent
(Spec
);
12555 while Present
(True_Parent
)
12556 and then Nkind
(True_Parent
) /= N_Compilation_Unit
12558 if Nkind
(True_Parent
) = N_Package_Declaration
12560 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
12562 -- Parent is a compilation unit that is an instantiation.
12563 -- Instantiation node has been replaced with package decl.
12565 Inst_Node
:= Original_Node
(True_Parent
);
12568 elsif Nkind
(True_Parent
) = N_Package_Declaration
12569 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
12570 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12572 -- Parent is an instantiation within another specification.
12573 -- Declaration for instance has been inserted before original
12574 -- instantiation node. A direct link would be preferable?
12576 Inst_Node
:= Next
(True_Parent
);
12577 while Present
(Inst_Node
)
12578 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
12583 -- If the instance appears within a generic, and the generic
12584 -- unit is defined within a formal package of the enclosing
12585 -- generic, there is no generic body available, and none
12586 -- needed. A more precise test should be used ???
12588 if No
(Inst_Node
) then
12595 True_Parent
:= Parent
(True_Parent
);
12599 -- Case where we are currently instantiating a nested generic
12601 if Present
(Inst_Node
) then
12602 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
12604 -- Instantiation node and declaration of instantiated package
12605 -- were exchanged when only the declaration was needed.
12606 -- Restore instantiation node before proceeding with body.
12608 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
12611 -- Now complete instantiation of enclosing body, if it appears in
12612 -- some other unit. If it appears in the current unit, the body
12613 -- will have been instantiated already.
12615 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
12617 -- We need to determine the expander mode to instantiate the
12618 -- enclosing body. Because the generic body we need may use
12619 -- global entities declared in the enclosing package (including
12620 -- aggregates) it is in general necessary to compile this body
12621 -- with expansion enabled, except if we are within a generic
12622 -- package, in which case the usual generic rule applies.
12625 Exp_Status
: Boolean := True;
12629 -- Loop through scopes looking for generic package
12631 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
12632 while Present
(Scop
)
12633 and then Scop
/= Standard_Standard
12635 if Ekind
(Scop
) = E_Generic_Package
then
12636 Exp_Status
:= False;
12640 Scop
:= Scope
(Scop
);
12643 -- Collect previous instantiations in the unit that contains
12644 -- the desired generic.
12646 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
12647 and then not Body_Optional
12651 Info
: Pending_Body_Info
;
12655 Par
:= Parent
(Inst_Node
);
12656 while Present
(Par
) loop
12657 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
12658 Par
:= Parent
(Par
);
12661 pragma Assert
(Present
(Par
));
12663 if Nkind
(Par
) = N_Package_Body
then
12664 Collect_Previous_Instances
(Declarations
(Par
));
12666 elsif Nkind
(Par
) = N_Package_Declaration
then
12667 Collect_Previous_Instances
12668 (Visible_Declarations
(Specification
(Par
)));
12669 Collect_Previous_Instances
12670 (Private_Declarations
(Specification
(Par
)));
12673 -- Enclosing unit is a subprogram body. In this
12674 -- case all instance bodies are processed in order
12675 -- and there is no need to collect them separately.
12680 Decl
:= First_Elmt
(Previous_Instances
);
12681 while Present
(Decl
) loop
12683 (Inst_Node
=> Node
(Decl
),
12685 Instance_Spec
(Node
(Decl
)),
12686 Expander_Status
=> Exp_Status
,
12687 Current_Sem_Unit
=>
12688 Get_Code_Unit
(Sloc
(Node
(Decl
))),
12689 Scope_Suppress
=> Scope_Suppress
,
12690 Local_Suppress_Stack_Top
=>
12691 Local_Suppress_Stack_Top
,
12692 Version
=> Ada_Version
,
12693 Version_Pragma
=> Ada_Version_Pragma
,
12694 Warnings
=> Save_Warnings
,
12695 SPARK_Mode
=> SPARK_Mode
,
12696 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
);
12698 -- Package instance
12701 Nkind
(Node
(Decl
)) = N_Package_Instantiation
12703 Instantiate_Package_Body
12704 (Info
, Body_Optional
=> True);
12706 -- Subprogram instance
12709 -- The instance_spec is the wrapper package,
12710 -- and the subprogram declaration is the last
12711 -- declaration in the wrapper.
12715 (Visible_Declarations
12716 (Specification
(Info
.Act_Decl
)));
12718 Instantiate_Subprogram_Body
12719 (Info
, Body_Optional
=> True);
12727 Instantiate_Package_Body
12729 ((Inst_Node
=> Inst_Node
,
12730 Act_Decl
=> True_Parent
,
12731 Expander_Status
=> Exp_Status
,
12732 Current_Sem_Unit
=> Get_Code_Unit
12733 (Sloc
(Inst_Node
)),
12734 Scope_Suppress
=> Scope_Suppress
,
12735 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
12736 Version
=> Ada_Version
,
12737 Version_Pragma
=> Ada_Version_Pragma
,
12738 Warnings
=> Save_Warnings
,
12739 SPARK_Mode
=> SPARK_Mode
,
12740 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
12741 Body_Optional
=> Body_Optional
);
12745 -- Case where we are not instantiating a nested generic
12748 Opt
.Style_Check
:= False;
12749 Expander_Mode_Save_And_Set
(True);
12750 Load_Needed_Body
(Comp_Unit
, OK
);
12751 Opt
.Style_Check
:= Saved_Style_Check
;
12752 Restore_Warnings
(Saved_Warnings
);
12753 Expander_Mode_Restore
;
12756 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
12757 and then not Body_Optional
12760 Bname
: constant Unit_Name_Type
:=
12761 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
12764 -- In CodePeer mode, the missing body may make the analysis
12765 -- incomplete, but we do not treat it as fatal.
12767 if CodePeer_Mode
then
12771 Error_Msg_Unit_1
:= Bname
;
12772 Error_Msg_N
("this instantiation requires$!", N
);
12773 Error_Msg_File_1
:=
12774 Get_File_Name
(Bname
, Subunit
=> False);
12775 Error_Msg_N
("\but file{ was not found!", N
);
12776 raise Unrecoverable_Error
;
12783 -- If loading parent of the generic caused an instantiation circularity,
12784 -- we abandon compilation at this point, because otherwise in some cases
12785 -- we get into trouble with infinite recursions after this point.
12787 if Circularity_Detected
then
12788 raise Unrecoverable_Error
;
12790 end Load_Parent_Of_Generic
;
12792 ---------------------------------
12793 -- Map_Formal_Package_Entities --
12794 ---------------------------------
12796 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
12801 Set_Instance_Of
(Form
, Act
);
12803 -- Traverse formal and actual package to map the corresponding entities.
12804 -- We skip over internal entities that may be generated during semantic
12805 -- analysis, and find the matching entities by name, given that they
12806 -- must appear in the same order.
12808 E1
:= First_Entity
(Form
);
12809 E2
:= First_Entity
(Act
);
12810 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
12811 -- Could this test be a single condition??? Seems like it could, and
12812 -- isn't FPE (Form) a constant anyway???
12814 if not Is_Internal
(E1
)
12815 and then Present
(Parent
(E1
))
12816 and then not Is_Class_Wide_Type
(E1
)
12817 and then not Is_Internal_Name
(Chars
(E1
))
12819 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
12826 Set_Instance_Of
(E1
, E2
);
12828 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
12829 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
12832 if Is_Constrained
(E1
) then
12833 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
12836 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
12837 Map_Formal_Package_Entities
(E1
, E2
);
12844 end Map_Formal_Package_Entities
;
12846 -----------------------
12847 -- Move_Freeze_Nodes --
12848 -----------------------
12850 procedure Move_Freeze_Nodes
12851 (Out_Of
: Entity_Id
;
12856 Next_Decl
: Node_Id
;
12857 Next_Node
: Node_Id
:= After
;
12860 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
12861 -- Check whether entity is declared in a scope external to that of the
12864 -------------------
12865 -- Is_Outer_Type --
12866 -------------------
12868 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
12869 Scop
: Entity_Id
:= Scope
(T
);
12872 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
12876 while Scop
/= Standard_Standard
loop
12877 if Scop
= Out_Of
then
12880 Scop
:= Scope
(Scop
);
12888 -- Start of processing for Move_Freeze_Nodes
12895 -- First remove the freeze nodes that may appear before all other
12899 while Present
(Decl
)
12900 and then Nkind
(Decl
) = N_Freeze_Entity
12901 and then Is_Outer_Type
(Entity
(Decl
))
12903 Decl
:= Remove_Head
(L
);
12904 Insert_After
(Next_Node
, Decl
);
12905 Set_Analyzed
(Decl
, False);
12910 -- Next scan the list of declarations and remove each freeze node that
12911 -- appears ahead of the current node.
12913 while Present
(Decl
) loop
12914 while Present
(Next
(Decl
))
12915 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
12916 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
12918 Next_Decl
:= Remove_Next
(Decl
);
12919 Insert_After
(Next_Node
, Next_Decl
);
12920 Set_Analyzed
(Next_Decl
, False);
12921 Next_Node
:= Next_Decl
;
12924 -- If the declaration is a nested package or concurrent type, then
12925 -- recurse. Nested generic packages will have been processed from the
12928 case Nkind
(Decl
) is
12929 when N_Package_Declaration
=>
12930 Spec
:= Specification
(Decl
);
12932 when N_Task_Type_Declaration
=>
12933 Spec
:= Task_Definition
(Decl
);
12935 when N_Protected_Type_Declaration
=>
12936 Spec
:= Protected_Definition
(Decl
);
12942 if Present
(Spec
) then
12943 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
12944 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
12949 end Move_Freeze_Nodes
;
12955 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
12957 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
12960 ------------------------
12961 -- Preanalyze_Actuals --
12962 ------------------------
12964 procedure Preanalyze_Actuals
(N
: Node_Id
) is
12967 Errs
: constant Int
:= Serious_Errors_Detected
;
12969 Cur
: Entity_Id
:= Empty
;
12970 -- Current homograph of the instance name
12973 -- Saved visibility status of the current homograph
12976 Assoc
:= First
(Generic_Associations
(N
));
12978 -- If the instance is a child unit, its name may hide an outer homonym,
12979 -- so make it invisible to perform name resolution on the actuals.
12981 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
12983 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
12985 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
12987 if Is_Compilation_Unit
(Cur
) then
12988 Vis
:= Is_Immediately_Visible
(Cur
);
12989 Set_Is_Immediately_Visible
(Cur
, False);
12995 while Present
(Assoc
) loop
12996 if Nkind
(Assoc
) /= N_Others_Choice
then
12997 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
12999 -- Within a nested instantiation, a defaulted actual is an empty
13000 -- association, so nothing to analyze. If the subprogram actual
13001 -- is an attribute, analyze prefix only, because actual is not a
13002 -- complete attribute reference.
13004 -- If actual is an allocator, analyze expression only. The full
13005 -- analysis can generate code, and if instance is a compilation
13006 -- unit we have to wait until the package instance is installed
13007 -- to have a proper place to insert this code.
13009 -- String literals may be operators, but at this point we do not
13010 -- know whether the actual is a formal subprogram or a string.
13015 elsif Nkind
(Act
) = N_Attribute_Reference
then
13016 Analyze
(Prefix
(Act
));
13018 elsif Nkind
(Act
) = N_Explicit_Dereference
then
13019 Analyze
(Prefix
(Act
));
13021 elsif Nkind
(Act
) = N_Allocator
then
13023 Expr
: constant Node_Id
:= Expression
(Act
);
13026 if Nkind
(Expr
) = N_Subtype_Indication
then
13027 Analyze
(Subtype_Mark
(Expr
));
13029 -- Analyze separately each discriminant constraint, when
13030 -- given with a named association.
13036 Constr
:= First
(Constraints
(Constraint
(Expr
)));
13037 while Present
(Constr
) loop
13038 if Nkind
(Constr
) = N_Discriminant_Association
then
13039 Analyze
(Expression
(Constr
));
13053 elsif Nkind
(Act
) /= N_Operator_Symbol
then
13057 if Errs
/= Serious_Errors_Detected
then
13059 -- Do a minimal analysis of the generic, to prevent spurious
13060 -- warnings complaining about the generic being unreferenced,
13061 -- before abandoning the instantiation.
13063 Analyze
(Name
(N
));
13065 if Is_Entity_Name
(Name
(N
))
13066 and then Etype
(Name
(N
)) /= Any_Type
13068 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
13069 Set_Is_Instantiated
(Entity
(Name
(N
)));
13072 if Present
(Cur
) then
13074 -- For the case of a child instance hiding an outer homonym,
13075 -- provide additional warning which might explain the error.
13077 Set_Is_Immediately_Visible
(Cur
, Vis
);
13078 Error_Msg_NE
("& hides outer unit with the same name??",
13079 N
, Defining_Unit_Name
(N
));
13082 Abandon_Instantiation
(Act
);
13089 if Present
(Cur
) then
13090 Set_Is_Immediately_Visible
(Cur
, Vis
);
13092 end Preanalyze_Actuals
;
13094 -------------------
13095 -- Remove_Parent --
13096 -------------------
13098 procedure Remove_Parent
(In_Body
: Boolean := False) is
13099 S
: Entity_Id
:= Current_Scope
;
13100 -- S is the scope containing the instantiation just completed. The scope
13101 -- stack contains the parent instances of the instantiation, followed by
13110 -- After child instantiation is complete, remove from scope stack the
13111 -- extra copy of the current scope, and then remove parent instances.
13113 if not In_Body
then
13116 while Current_Scope
/= S
loop
13117 P
:= Current_Scope
;
13118 End_Package_Scope
(Current_Scope
);
13120 if In_Open_Scopes
(P
) then
13121 E
:= First_Entity
(P
);
13122 while Present
(E
) loop
13123 Set_Is_Immediately_Visible
(E
, True);
13127 -- If instantiation is declared in a block, it is the enclosing
13128 -- scope that might be a parent instance. Note that only one
13129 -- block can be involved, because the parent instances have
13130 -- been installed within it.
13132 if Ekind
(P
) = E_Block
then
13133 Cur_P
:= Scope
(P
);
13138 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
13139 -- We are within an instance of some sibling. Retain
13140 -- visibility of parent, for proper subsequent cleanup, and
13141 -- reinstall private declarations as well.
13143 Set_In_Private_Part
(P
);
13144 Install_Private_Declarations
(P
);
13147 -- If the ultimate parent is a top-level unit recorded in
13148 -- Instance_Parent_Unit, then reset its visibility to what it was
13149 -- before instantiation. (It's not clear what the purpose is of
13150 -- testing whether Scope (P) is In_Open_Scopes, but that test was
13151 -- present before the ultimate parent test was added.???)
13153 elsif not In_Open_Scopes
(Scope
(P
))
13154 or else (P
= Instance_Parent_Unit
13155 and then not Parent_Unit_Visible
)
13157 Set_Is_Immediately_Visible
(P
, False);
13159 -- If the current scope is itself an instantiation of a generic
13160 -- nested within P, and we are in the private part of body of this
13161 -- instantiation, restore the full views of P, that were removed
13162 -- in End_Package_Scope above. This obscure case can occur when a
13163 -- subunit of a generic contains an instance of a child unit of
13164 -- its generic parent unit.
13166 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
13168 Par
: constant Entity_Id
:=
13169 Generic_Parent
(Package_Specification
(S
));
13172 and then P
= Scope
(Par
)
13173 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
13175 Set_In_Private_Part
(P
);
13176 Install_Private_Declarations
(P
);
13182 -- Reset visibility of entities in the enclosing scope
13184 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
13186 Hidden
:= First_Elmt
(Hidden_Entities
);
13187 while Present
(Hidden
) loop
13188 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
13189 Next_Elmt
(Hidden
);
13193 -- Each body is analyzed separately, and there is no context that
13194 -- needs preserving from one body instance to the next, so remove all
13195 -- parent scopes that have been installed.
13197 while Present
(S
) loop
13198 End_Package_Scope
(S
);
13199 Set_Is_Immediately_Visible
(S
, False);
13200 S
:= Current_Scope
;
13201 exit when S
= Standard_Standard
;
13210 procedure Restore_Env
is
13211 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
13214 if No
(Current_Instantiated_Parent
.Act_Id
) then
13215 -- Restore environment after subprogram inlining
13217 Restore_Private_Views
(Empty
);
13220 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
13221 Exchanged_Views
:= Saved
.Exchanged_Views
;
13222 Hidden_Entities
:= Saved
.Hidden_Entities
;
13223 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
13224 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
13225 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
13227 Restore_Opt_Config_Switches
(Saved
.Switches
);
13229 Instance_Envs
.Decrement_Last
;
13232 ---------------------------
13233 -- Restore_Private_Views --
13234 ---------------------------
13236 procedure Restore_Private_Views
13237 (Pack_Id
: Entity_Id
;
13238 Is_Package
: Boolean := True)
13243 Dep_Elmt
: Elmt_Id
;
13246 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
13247 -- Hide the generic formals of formal packages declared with box which
13248 -- were reachable in the current instantiation.
13250 ---------------------------
13251 -- Restore_Nested_Formal --
13252 ---------------------------
13254 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
13258 if Present
(Renamed_Object
(Formal
))
13259 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
13263 elsif Present
(Associated_Formal_Package
(Formal
)) then
13264 Ent
:= First_Entity
(Formal
);
13265 while Present
(Ent
) loop
13266 exit when Ekind
(Ent
) = E_Package
13267 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
13269 Set_Is_Hidden
(Ent
);
13270 Set_Is_Potentially_Use_Visible
(Ent
, False);
13272 -- If package, then recurse
13274 if Ekind
(Ent
) = E_Package
then
13275 Restore_Nested_Formal
(Ent
);
13281 end Restore_Nested_Formal
;
13283 -- Start of processing for Restore_Private_Views
13286 M
:= First_Elmt
(Exchanged_Views
);
13287 while Present
(M
) loop
13290 -- Subtypes of types whose views have been exchanged, and that are
13291 -- defined within the instance, were not on the Private_Dependents
13292 -- list on entry to the instance, so they have to be exchanged
13293 -- explicitly now, in order to remain consistent with the view of the
13296 if Ekind_In
(Typ
, E_Private_Type
,
13297 E_Limited_Private_Type
,
13298 E_Record_Type_With_Private
)
13300 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
13301 while Present
(Dep_Elmt
) loop
13302 Dep_Typ
:= Node
(Dep_Elmt
);
13304 if Scope
(Dep_Typ
) = Pack_Id
13305 and then Present
(Full_View
(Dep_Typ
))
13307 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
13308 Exchange_Declarations
(Dep_Typ
);
13311 Next_Elmt
(Dep_Elmt
);
13315 Exchange_Declarations
(Node
(M
));
13319 if No
(Pack_Id
) then
13323 -- Make the generic formal parameters private, and make the formal types
13324 -- into subtypes of the actuals again.
13326 E
:= First_Entity
(Pack_Id
);
13327 while Present
(E
) loop
13328 Set_Is_Hidden
(E
, True);
13331 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
13333 -- If the actual for E is itself a generic actual type from
13334 -- an enclosing instance, E is still a generic actual type
13335 -- outside of the current instance. This matter when resolving
13336 -- an overloaded call that may be ambiguous in the enclosing
13337 -- instance, when two of its actuals coincide.
13339 if Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
13340 and then Is_Generic_Actual_Type
13341 (Entity
(Subtype_Indication
(Parent
(E
))))
13345 Set_Is_Generic_Actual_Type
(E
, False);
13348 -- An unusual case of aliasing: the actual may also be directly
13349 -- visible in the generic, and be private there, while it is fully
13350 -- visible in the context of the instance. The internal subtype
13351 -- is private in the instance but has full visibility like its
13352 -- parent in the enclosing scope. This enforces the invariant that
13353 -- the privacy status of all private dependents of a type coincide
13354 -- with that of the parent type. This can only happen when a
13355 -- generic child unit is instantiated within a sibling.
13357 if Is_Private_Type
(E
)
13358 and then not Is_Private_Type
(Etype
(E
))
13360 Exchange_Declarations
(E
);
13363 elsif Ekind
(E
) = E_Package
then
13365 -- The end of the renaming list is the renaming of the generic
13366 -- package itself. If the instance is a subprogram, all entities
13367 -- in the corresponding package are renamings. If this entity is
13368 -- a formal package, make its own formals private as well. The
13369 -- actual in this case is itself the renaming of an instantiation.
13370 -- If the entity is not a package renaming, it is the entity
13371 -- created to validate formal package actuals: ignore it.
13373 -- If the actual is itself a formal package for the enclosing
13374 -- generic, or the actual for such a formal package, it remains
13375 -- visible on exit from the instance, and therefore nothing needs
13376 -- to be done either, except to keep it accessible.
13378 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
13381 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
13385 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
13387 Set_Is_Hidden
(E
, False);
13391 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
13395 Id
:= First_Entity
(Act_P
);
13397 and then Id
/= First_Private_Entity
(Act_P
)
13399 exit when Ekind
(Id
) = E_Package
13400 and then Renamed_Object
(Id
) = Act_P
;
13402 Set_Is_Hidden
(Id
, True);
13403 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
13405 if Ekind
(Id
) = E_Package
then
13406 Restore_Nested_Formal
(Id
);
13417 end Restore_Private_Views
;
13424 (Gen_Unit
: Entity_Id
;
13425 Act_Unit
: Entity_Id
)
13429 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
13432 ----------------------------
13433 -- Save_Global_References --
13434 ----------------------------
13436 procedure Save_Global_References
(N
: Node_Id
) is
13437 Gen_Scope
: Entity_Id
;
13441 function Is_Global
(E
: Entity_Id
) return Boolean;
13442 -- Check whether entity is defined outside of generic unit. Examine the
13443 -- scope of an entity, and the scope of the scope, etc, until we find
13444 -- either Standard, in which case the entity is global, or the generic
13445 -- unit itself, which indicates that the entity is local. If the entity
13446 -- is the generic unit itself, as in the case of a recursive call, or
13447 -- the enclosing generic unit, if different from the current scope, then
13448 -- it is local as well, because it will be replaced at the point of
13449 -- instantiation. On the other hand, if it is a reference to a child
13450 -- unit of a common ancestor, which appears in an instantiation, it is
13451 -- global because it is used to denote a specific compilation unit at
13452 -- the time the instantiations will be analyzed.
13454 procedure Reset_Entity
(N
: Node_Id
);
13455 -- Save semantic information on global entity so that it is not resolved
13456 -- again at instantiation time.
13458 procedure Save_Entity_Descendants
(N
: Node_Id
);
13459 -- Apply Save_Global_References to the two syntactic descendants of
13460 -- non-terminal nodes that carry an Associated_Node and are processed
13461 -- through Reset_Entity. Once the global entity (if any) has been
13462 -- captured together with its type, only two syntactic descendants need
13463 -- to be traversed to complete the processing of the tree rooted at N.
13464 -- This applies to Selected_Components, Expanded_Names, and to Operator
13465 -- nodes. N can also be a character literal, identifier, or operator
13466 -- symbol node, but the call has no effect in these cases.
13468 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
13469 -- Default actuals in nested instances must be handled specially
13470 -- because there is no link to them from the original tree. When an
13471 -- actual subprogram is given by a default, we add an explicit generic
13472 -- association for it in the instantiation node. When we save the
13473 -- global references on the name of the instance, we recover the list
13474 -- of generic associations, and add an explicit one to the original
13475 -- generic tree, through which a global actual can be preserved.
13476 -- Similarly, if a child unit is instantiated within a sibling, in the
13477 -- context of the parent, we must preserve the identifier of the parent
13478 -- so that it can be properly resolved in a subsequent instantiation.
13480 procedure Save_Global_Descendant
(D
: Union_Id
);
13481 -- Apply Save_Global_References recursively to the descendents of the
13484 procedure Save_References
(N
: Node_Id
);
13485 -- This is the recursive procedure that does the work, once the
13486 -- enclosing generic scope has been established.
13492 function Is_Global
(E
: Entity_Id
) return Boolean is
13495 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
13496 -- Determine whether the parent node of a reference to a child unit
13497 -- denotes an instantiation or a formal package, in which case the
13498 -- reference to the child unit is global, even if it appears within
13499 -- the current scope (e.g. when the instance appears within the body
13500 -- of an ancestor).
13502 ----------------------
13503 -- Is_Instance_Node --
13504 ----------------------
13506 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
13508 return Nkind
(Decl
) in N_Generic_Instantiation
13510 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
13511 end Is_Instance_Node
;
13513 -- Start of processing for Is_Global
13516 if E
= Gen_Scope
then
13519 elsif E
= Standard_Standard
then
13522 elsif Is_Child_Unit
(E
)
13523 and then (Is_Instance_Node
(Parent
(N2
))
13524 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
13525 and then N2
= Selector_Name
(Parent
(N2
))
13527 Is_Instance_Node
(Parent
(Parent
(N2
)))))
13533 while Se
/= Gen_Scope
loop
13534 if Se
= Standard_Standard
then
13549 procedure Reset_Entity
(N
: Node_Id
) is
13551 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
13552 -- If the type of N2 is global to the generic unit, save the type in
13553 -- the generic node. Just as we perform name capture for explicit
13554 -- references within the generic, we must capture the global types
13555 -- of local entities because they may participate in resolution in
13558 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
13559 -- Find the ultimate ancestor of the current unit. If it is not a
13560 -- generic unit, then the name of the current unit in the prefix of
13561 -- an expanded name must be replaced with its generic homonym to
13562 -- ensure that it will be properly resolved in an instance.
13564 ---------------------
13565 -- Set_Global_Type --
13566 ---------------------
13568 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
13569 Typ
: constant Entity_Id
:= Etype
(N2
);
13572 Set_Etype
(N
, Typ
);
13574 if Entity
(N
) /= N2
13575 and then Has_Private_View
(Entity
(N
))
13577 -- If the entity of N is not the associated node, this is a
13578 -- nested generic and it has an associated node as well, whose
13579 -- type is already the full view (see below). Indicate that the
13580 -- original node has a private view.
13582 Set_Has_Private_View
(N
);
13585 -- If not a private type, nothing else to do
13587 if not Is_Private_Type
(Typ
) then
13588 if Is_Array_Type
(Typ
)
13589 and then Is_Private_Type
(Component_Type
(Typ
))
13591 Set_Has_Private_View
(N
);
13594 -- If it is a derivation of a private type in a context where no
13595 -- full view is needed, nothing to do either.
13597 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
13600 -- Otherwise mark the type for flipping and use the full view when
13604 Set_Has_Private_View
(N
);
13606 if Present
(Full_View
(Typ
)) then
13607 Set_Etype
(N2
, Full_View
(Typ
));
13610 end Set_Global_Type
;
13616 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
13621 while Is_Child_Unit
(Par
) loop
13622 Par
:= Scope
(Par
);
13628 -- Start of processing for Reset_Entity
13631 N2
:= Get_Associated_Node
(N
);
13634 if Present
(E
) then
13636 -- If the node is an entry call to an entry in an enclosing task,
13637 -- it is rewritten as a selected component. No global entity to
13638 -- preserve in this case, since the expansion will be redone in
13641 if not Nkind_In
(E
, N_Defining_Identifier
,
13642 N_Defining_Character_Literal
,
13643 N_Defining_Operator_Symbol
)
13645 Set_Associated_Node
(N
, Empty
);
13646 Set_Etype
(N
, Empty
);
13650 -- If the entity is an itype created as a subtype of an access
13651 -- type with a null exclusion restore source entity for proper
13652 -- visibility. The itype will be created anew in the instance.
13655 and then Ekind
(E
) = E_Access_Subtype
13656 and then Is_Entity_Name
(N
)
13657 and then Chars
(Etype
(E
)) = Chars
(N
)
13660 Set_Entity
(N2
, E
);
13664 if Is_Global
(E
) then
13666 -- If the entity is a package renaming that is the prefix of
13667 -- an expanded name, it has been rewritten as the renamed
13668 -- package, which is necessary semantically but complicates
13669 -- ASIS tree traversal, so we recover the original entity to
13670 -- expose the renaming. Take into account that the context may
13671 -- be a nested generic, that the original node may itself have
13672 -- an associated node that had better be an entity, and that
13673 -- the current node is still a selected component.
13675 if Ekind
(E
) = E_Package
13676 and then Nkind
(N
) = N_Selected_Component
13677 and then Nkind
(Parent
(N
)) = N_Expanded_Name
13678 and then Present
(Original_Node
(N2
))
13679 and then Is_Entity_Name
(Original_Node
(N2
))
13680 and then Present
(Entity
(Original_Node
(N2
)))
13682 if Is_Global
(Entity
(Original_Node
(N2
))) then
13683 N2
:= Original_Node
(N2
);
13684 Set_Associated_Node
(N
, N2
);
13685 Set_Global_Type
(N
, N2
);
13688 -- Renaming is local, and will be resolved in instance
13690 Set_Associated_Node
(N
, Empty
);
13691 Set_Etype
(N
, Empty
);
13695 Set_Global_Type
(N
, N2
);
13698 elsif Nkind
(N
) = N_Op_Concat
13699 and then Is_Generic_Type
(Etype
(N2
))
13700 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
13702 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
13703 and then Is_Intrinsic_Subprogram
(E
)
13708 -- Entity is local. Mark generic node as unresolved.
13709 -- Note that now it does not have an entity.
13711 Set_Associated_Node
(N
, Empty
);
13712 Set_Etype
(N
, Empty
);
13715 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
13716 and then N
= Name
(Parent
(N
))
13718 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
13721 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13722 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
13724 if Is_Global
(Entity
(Parent
(N2
))) then
13725 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13726 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
13727 Set_Global_Type
(Parent
(N
), Parent
(N2
));
13728 Save_Entity_Descendants
(N
);
13730 -- If this is a reference to the current generic entity, replace
13731 -- by the name of the generic homonym of the current package. This
13732 -- is because in an instantiation Par.P.Q will not resolve to the
13733 -- name of the instance, whose enclosing scope is not necessarily
13734 -- Par. We use the generic homonym rather that the name of the
13735 -- generic itself because it may be hidden by a local declaration.
13737 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
13739 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
13741 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
13742 Rewrite
(Parent
(N
),
13743 Make_Identifier
(Sloc
(N
),
13745 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
13747 Rewrite
(Parent
(N
),
13748 Make_Identifier
(Sloc
(N
),
13749 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
13753 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
13754 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
13756 Save_Global_Defaults
13757 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
13760 -- A selected component may denote a static constant that has been
13761 -- folded. If the static constant is global to the generic, capture
13762 -- its value. Otherwise the folding will happen in any instantiation.
13764 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13765 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
13767 if Present
(Entity
(Original_Node
(Parent
(N2
))))
13768 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
13770 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
13771 Set_Analyzed
(Parent
(N
), False);
13777 -- A selected component may be transformed into a parameterless
13778 -- function call. If the called entity is global, rewrite the node
13779 -- appropriately, i.e. as an extended name for the global entity.
13781 elsif Nkind
(Parent
(N
)) = N_Selected_Component
13782 and then Nkind
(Parent
(N2
)) = N_Function_Call
13783 and then N
= Selector_Name
(Parent
(N
))
13785 if No
(Parameter_Associations
(Parent
(N2
))) then
13786 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
13787 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
13788 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
13789 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
13790 Save_Entity_Descendants
(N
);
13793 Set_Is_Prefixed_Call
(Parent
(N
));
13794 Set_Associated_Node
(N
, Empty
);
13795 Set_Etype
(N
, Empty
);
13798 -- In Ada 2005, X.F may be a call to a primitive operation,
13799 -- rewritten as F (X). This rewriting will be done again in an
13800 -- instance, so keep the original node. Global entities will be
13801 -- captured as for other constructs. Indicate that this must
13802 -- resolve as a call, to prevent accidental overloading in the
13803 -- instance, if both a component and a primitive operation appear
13807 Set_Is_Prefixed_Call
(Parent
(N
));
13810 -- Entity is local. Reset in generic unit, so that node is resolved
13811 -- anew at the point of instantiation.
13814 Set_Associated_Node
(N
, Empty
);
13815 Set_Etype
(N
, Empty
);
13819 -----------------------------
13820 -- Save_Entity_Descendants --
13821 -----------------------------
13823 procedure Save_Entity_Descendants
(N
: Node_Id
) is
13826 when N_Binary_Op
=>
13827 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
13828 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13831 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
13833 when N_Expanded_Name | N_Selected_Component
=>
13834 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
13835 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
13837 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
13841 raise Program_Error
;
13843 end Save_Entity_Descendants
;
13845 --------------------------
13846 -- Save_Global_Defaults --
13847 --------------------------
13849 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
13850 Loc
: constant Source_Ptr
:= Sloc
(N1
);
13851 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
13852 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
13859 Actual
: Entity_Id
;
13862 Assoc1
:= Generic_Associations
(N1
);
13864 if Present
(Assoc1
) then
13865 Act1
:= First
(Assoc1
);
13868 Set_Generic_Associations
(N1
, New_List
);
13869 Assoc1
:= Generic_Associations
(N1
);
13872 if Present
(Assoc2
) then
13873 Act2
:= First
(Assoc2
);
13878 while Present
(Act1
) and then Present
(Act2
) loop
13883 -- Find the associations added for default subprograms
13885 if Present
(Act2
) then
13886 while Nkind
(Act2
) /= N_Generic_Association
13887 or else No
(Entity
(Selector_Name
(Act2
)))
13888 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
13893 -- Add a similar association if the default is global. The
13894 -- renaming declaration for the actual has been analyzed, and
13895 -- its alias is the program it renames. Link the actual in the
13896 -- original generic tree with the node in the analyzed tree.
13898 while Present
(Act2
) loop
13899 Subp
:= Entity
(Selector_Name
(Act2
));
13900 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
13902 -- Following test is defence against rubbish errors
13904 if No
(Alias
(Subp
)) then
13908 -- Retrieve the resolved actual from the renaming declaration
13909 -- created for the instantiated formal.
13911 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
13912 Set_Entity
(Def
, Actual
);
13913 Set_Etype
(Def
, Etype
(Actual
));
13915 if Is_Global
(Actual
) then
13917 Make_Generic_Association
(Loc
,
13918 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13919 Explicit_Generic_Actual_Parameter
=>
13920 New_Occurrence_Of
(Actual
, Loc
));
13922 Set_Associated_Node
13923 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
13925 Append
(Ndec
, Assoc1
);
13927 -- If there are other defaults, add a dummy association in case
13928 -- there are other defaulted formals with the same name.
13930 elsif Present
(Next
(Act2
)) then
13932 Make_Generic_Association
(Loc
,
13933 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
13934 Explicit_Generic_Actual_Parameter
=> Empty
);
13936 Append
(Ndec
, Assoc1
);
13943 if Nkind
(Name
(N1
)) = N_Identifier
13944 and then Is_Child_Unit
(Gen_Id
)
13945 and then Is_Global
(Gen_Id
)
13946 and then Is_Generic_Unit
(Scope
(Gen_Id
))
13947 and then In_Open_Scopes
(Scope
(Gen_Id
))
13949 -- This is an instantiation of a child unit within a sibling, so
13950 -- that the generic parent is in scope. An eventual instance must
13951 -- occur within the scope of an instance of the parent. Make name
13952 -- in instance into an expanded name, to preserve the identifier
13953 -- of the parent, so it can be resolved subsequently.
13955 Rewrite
(Name
(N2
),
13956 Make_Expanded_Name
(Loc
,
13957 Chars
=> Chars
(Gen_Id
),
13958 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13959 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13960 Set_Entity
(Name
(N2
), Gen_Id
);
13962 Rewrite
(Name
(N1
),
13963 Make_Expanded_Name
(Loc
,
13964 Chars
=> Chars
(Gen_Id
),
13965 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
13966 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
13968 Set_Associated_Node
(Name
(N1
), Name
(N2
));
13969 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
13970 Set_Associated_Node
13971 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
13972 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
13975 end Save_Global_Defaults
;
13977 ----------------------------
13978 -- Save_Global_Descendant --
13979 ----------------------------
13981 procedure Save_Global_Descendant
(D
: Union_Id
) is
13985 if D
in Node_Range
then
13986 if D
= Union_Id
(Empty
) then
13989 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
13990 Save_References
(Node_Id
(D
));
13993 elsif D
in List_Range
then
13994 if D
= Union_Id
(No_List
) or else Is_Empty_List
(List_Id
(D
)) then
13998 N1
:= First
(List_Id
(D
));
13999 while Present
(N1
) loop
14000 Save_References
(N1
);
14005 -- Element list or other non-node field, nothing to do
14010 end Save_Global_Descendant
;
14012 ---------------------
14013 -- Save_References --
14014 ---------------------
14016 -- This is the recursive procedure that does the work once the enclosing
14017 -- generic scope has been established. We have to treat specially a
14018 -- number of node rewritings that are required by semantic processing
14019 -- and which change the kind of nodes in the generic copy: typically
14020 -- constant-folding, replacing an operator node by a string literal, or
14021 -- a selected component by an expanded name. In each of those cases, the
14022 -- transformation is propagated to the generic unit.
14024 procedure Save_References
(N
: Node_Id
) is
14025 Loc
: constant Source_Ptr
:= Sloc
(N
);
14031 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
14032 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14035 elsif Nkind
(N
) = N_Operator_Symbol
14036 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
14038 Change_Operator_Symbol_To_String_Literal
(N
);
14041 elsif Nkind
(N
) in N_Op
then
14042 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14043 if Nkind
(N
) = N_Op_Concat
then
14044 Set_Is_Component_Left_Opnd
(N
,
14045 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
14047 Set_Is_Component_Right_Opnd
(N
,
14048 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
14054 -- Node may be transformed into call to a user-defined operator
14056 N2
:= Get_Associated_Node
(N
);
14058 if Nkind
(N2
) = N_Function_Call
then
14059 E
:= Entity
(Name
(N2
));
14062 and then Is_Global
(E
)
14064 Set_Etype
(N
, Etype
(N2
));
14066 Set_Associated_Node
(N
, Empty
);
14067 Set_Etype
(N
, Empty
);
14070 elsif Nkind_In
(N2
, N_Integer_Literal
,
14074 if Present
(Original_Node
(N2
))
14075 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
14078 -- Operation was constant-folded. Whenever possible,
14079 -- recover semantic information from unfolded node,
14082 Set_Associated_Node
(N
, Original_Node
(N2
));
14084 if Nkind
(N
) = N_Op_Concat
then
14085 Set_Is_Component_Left_Opnd
(N
,
14086 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
14087 Set_Is_Component_Right_Opnd
(N
,
14088 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
14094 -- If original node is already modified, propagate
14095 -- constant-folding to template.
14097 Rewrite
(N
, New_Copy
(N2
));
14098 Set_Analyzed
(N
, False);
14101 elsif Nkind
(N2
) = N_Identifier
14102 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
14104 -- Same if call was folded into a literal, but in this case
14105 -- retain the entity to avoid spurious ambiguities if it is
14106 -- overloaded at the point of instantiation or inlining.
14108 Rewrite
(N
, New_Copy
(N2
));
14109 Set_Analyzed
(N
, False);
14113 -- Complete operands check if node has not been constant-folded
14115 if Nkind
(N
) in N_Op
then
14116 Save_Entity_Descendants
(N
);
14119 elsif Nkind
(N
) = N_Identifier
then
14120 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
14122 -- If this is a discriminant reference, always save it. It is
14123 -- used in the instance to find the corresponding discriminant
14124 -- positionally rather than by name.
14126 Set_Original_Discriminant
14127 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
14131 N2
:= Get_Associated_Node
(N
);
14133 if Nkind
(N2
) = N_Function_Call
then
14134 E
:= Entity
(Name
(N2
));
14136 -- Name resolves to a call to parameterless function. If
14137 -- original entity is global, mark node as resolved.
14140 and then Is_Global
(E
)
14142 Set_Etype
(N
, Etype
(N2
));
14144 Set_Associated_Node
(N
, Empty
);
14145 Set_Etype
(N
, Empty
);
14148 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
14149 and then Is_Entity_Name
(Original_Node
(N2
))
14151 -- Name resolves to named number that is constant-folded,
14152 -- We must preserve the original name for ASIS use, and
14153 -- undo the constant-folding, which will be repeated in
14156 Set_Associated_Node
(N
, Original_Node
(N2
));
14159 elsif Nkind
(N2
) = N_String_Literal
then
14161 -- Name resolves to string literal. Perform the same
14162 -- replacement in generic.
14164 Rewrite
(N
, New_Copy
(N2
));
14166 elsif Nkind
(N2
) = N_Explicit_Dereference
then
14168 -- An identifier is rewritten as a dereference if it is the
14169 -- prefix in an implicit dereference (call or attribute).
14170 -- The analysis of an instantiation will expand the node
14171 -- again, so we preserve the original tree but link it to
14172 -- the resolved entity in case it is global.
14174 if Is_Entity_Name
(Prefix
(N2
))
14175 and then Present
(Entity
(Prefix
(N2
)))
14176 and then Is_Global
(Entity
(Prefix
(N2
)))
14178 Set_Associated_Node
(N
, Prefix
(N2
));
14180 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
14181 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
14184 Make_Explicit_Dereference
(Loc
,
14185 Prefix
=> Make_Function_Call
(Loc
,
14187 New_Occurrence_Of
(Entity
(Name
(Prefix
(N2
))),
14191 Set_Associated_Node
(N
, Empty
);
14192 Set_Etype
(N
, Empty
);
14195 -- The subtype mark of a nominally unconstrained object is
14196 -- rewritten as a subtype indication using the bounds of the
14197 -- expression. Recover the original subtype mark.
14199 elsif Nkind
(N2
) = N_Subtype_Indication
14200 and then Is_Entity_Name
(Original_Node
(N2
))
14202 Set_Associated_Node
(N
, Original_Node
(N2
));
14210 elsif Nkind
(N
) in N_Entity
then
14215 Qual
: Node_Id
:= Empty
;
14216 Typ
: Entity_Id
:= Empty
;
14219 use Atree
.Unchecked_Access
;
14220 -- This code section is part of implementing an untyped tree
14221 -- traversal, so it needs direct access to node fields.
14224 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
14225 N2
:= Get_Associated_Node
(N
);
14232 -- In an instance within a generic, use the name of the
14233 -- actual and not the original generic parameter. If the
14234 -- actual is global in the current generic it must be
14235 -- preserved for its instantiation.
14237 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
14239 Present
(Generic_Parent_Type
(Parent
(Typ
)))
14241 Typ
:= Base_Type
(Typ
);
14242 Set_Etype
(N2
, Typ
);
14246 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
14247 Set_Associated_Node
(N
, Empty
);
14249 -- If the aggregate is an actual in a call, it has been
14250 -- resolved in the current context, to some local type.
14251 -- The enclosing call may have been disambiguated by the
14252 -- aggregate, and this disambiguation might fail at
14253 -- instantiation time because the type to which the
14254 -- aggregate did resolve is not preserved. In order to
14255 -- preserve some of this information, we wrap the
14256 -- aggregate in a qualified expression, using the id of
14257 -- its type. For further disambiguation we qualify the
14258 -- type name with its scope (if visible) because both
14259 -- id's will have corresponding entities in an instance.
14260 -- This resolves most of the problems with missing type
14261 -- information on aggregates in instances.
14263 if Nkind
(N2
) = Nkind
(N
)
14264 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
14265 and then Comes_From_Source
(Typ
)
14267 if Is_Immediately_Visible
(Scope
(Typ
)) then
14268 Nam
:= Make_Selected_Component
(Loc
,
14270 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
14272 Make_Identifier
(Loc
, Chars
(Typ
)));
14274 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
14278 Make_Qualified_Expression
(Loc
,
14279 Subtype_Mark
=> Nam
,
14280 Expression
=> Relocate_Node
(N
));
14284 Save_Global_Descendant
(Field1
(N
));
14285 Save_Global_Descendant
(Field2
(N
));
14286 Save_Global_Descendant
(Field3
(N
));
14287 Save_Global_Descendant
(Field5
(N
));
14289 if Present
(Qual
) then
14293 -- All other cases than aggregates
14296 Save_Global_Descendant
(Field1
(N
));
14297 Save_Global_Descendant
(Field2
(N
));
14298 Save_Global_Descendant
(Field3
(N
));
14299 Save_Global_Descendant
(Field4
(N
));
14300 Save_Global_Descendant
(Field5
(N
));
14305 -- If a node has aspects, references within their expressions must
14306 -- be saved separately, given they are not directly in the tree.
14308 if Has_Aspects
(N
) then
14313 Aspect
:= First
(Aspect_Specifications
(N
));
14314 while Present
(Aspect
) loop
14315 if Present
(Expression
(Aspect
)) then
14316 Save_Global_References
(Expression
(Aspect
));
14323 end Save_References
;
14325 -- Start of processing for Save_Global_References
14328 Gen_Scope
:= Current_Scope
;
14330 -- If the generic unit is a child unit, references to entities in the
14331 -- parent are treated as local, because they will be resolved anew in
14332 -- the context of the instance of the parent.
14334 while Is_Child_Unit
(Gen_Scope
)
14335 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
14337 Gen_Scope
:= Scope
(Gen_Scope
);
14340 Save_References
(N
);
14341 end Save_Global_References
;
14343 --------------------------------------
14344 -- Set_Copied_Sloc_For_Inlined_Body --
14345 --------------------------------------
14347 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
14349 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
14350 end Set_Copied_Sloc_For_Inlined_Body
;
14352 ---------------------
14353 -- Set_Instance_Of --
14354 ---------------------
14356 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
14358 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
14359 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
14360 Generic_Renamings
.Increment_Last
;
14361 end Set_Instance_Of
;
14363 --------------------
14364 -- Set_Next_Assoc --
14365 --------------------
14367 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
14369 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
14370 end Set_Next_Assoc
;
14372 -------------------
14373 -- Start_Generic --
14374 -------------------
14376 procedure Start_Generic
is
14378 -- ??? More things could be factored out in this routine.
14379 -- Should probably be done at a later stage.
14381 Generic_Flags
.Append
(Inside_A_Generic
);
14382 Inside_A_Generic
:= True;
14384 Expander_Mode_Save_And_Set
(False);
14387 ----------------------
14388 -- Set_Instance_Env --
14389 ----------------------
14391 procedure Set_Instance_Env
14392 (Gen_Unit
: Entity_Id
;
14393 Act_Unit
: Entity_Id
)
14395 Assertion_Status
: constant Boolean := Assertions_Enabled
;
14396 Save_SPARK_Mode
: constant SPARK_Mode_Type
:= SPARK_Mode
;
14397 Save_SPARK_Mode_Pragma
: constant Node_Id
:= SPARK_Mode_Pragma
;
14400 -- Regardless of the current mode, predefined units are analyzed in the
14401 -- most current Ada mode, and earlier version Ada checks do not apply
14402 -- to predefined units. Nothing needs to be done for non-internal units.
14403 -- These are always analyzed in the current mode.
14405 if Is_Internal_File_Name
14406 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
14407 Renamings_Included
=> True)
14409 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
14411 -- In Ada2012 we may want to enable assertions in an instance of a
14412 -- predefined unit, in which case we need to preserve the current
14413 -- setting for the Assertions_Enabled flag. This will become more
14414 -- critical when pre/postconditions are added to predefined units,
14415 -- as is already the case for some numeric libraries.
14417 if Ada_Version
>= Ada_2012
then
14418 Assertions_Enabled
:= Assertion_Status
;
14421 -- SPARK_Mode for an instance is the one applicable at the point of
14424 SPARK_Mode
:= Save_SPARK_Mode
;
14425 SPARK_Mode_Pragma
:= Save_SPARK_Mode_Pragma
;
14428 Current_Instantiated_Parent
:=
14429 (Gen_Id
=> Gen_Unit
,
14430 Act_Id
=> Act_Unit
,
14431 Next_In_HTable
=> Assoc_Null
);
14432 end Set_Instance_Env
;
14438 procedure Switch_View
(T
: Entity_Id
) is
14439 BT
: constant Entity_Id
:= Base_Type
(T
);
14440 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
14441 Priv_Sub
: Entity_Id
;
14444 -- T may be private but its base type may have been exchanged through
14445 -- some other occurrence, in which case there is nothing to switch
14446 -- besides T itself. Note that a private dependent subtype of a private
14447 -- type might not have been switched even if the base type has been,
14448 -- because of the last branch of Check_Private_View (see comment there).
14450 if not Is_Private_Type
(BT
) then
14451 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
14452 Exchange_Declarations
(T
);
14456 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
14458 if Present
(Full_View
(BT
)) then
14459 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
14460 Exchange_Declarations
(BT
);
14463 while Present
(Priv_Elmt
) loop
14464 Priv_Sub
:= (Node
(Priv_Elmt
));
14466 -- We avoid flipping the subtype if the Etype of its full view is
14467 -- private because this would result in a malformed subtype. This
14468 -- occurs when the Etype of the subtype full view is the full view of
14469 -- the base type (and since the base types were just switched, the
14470 -- subtype is pointing to the wrong view). This is currently the case
14471 -- for tagged record types, access types (maybe more?) and needs to
14472 -- be resolved. ???
14474 if Present
(Full_View
(Priv_Sub
))
14475 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
14477 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
14478 Exchange_Declarations
(Priv_Sub
);
14481 Next_Elmt
(Priv_Elmt
);
14489 function True_Parent
(N
: Node_Id
) return Node_Id
is
14491 if Nkind
(Parent
(N
)) = N_Subunit
then
14492 return Parent
(Corresponding_Stub
(Parent
(N
)));
14498 -----------------------------
14499 -- Valid_Default_Attribute --
14500 -----------------------------
14502 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
14503 Attr_Id
: constant Attribute_Id
:=
14504 Get_Attribute_Id
(Attribute_Name
(Def
));
14505 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
14506 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
14512 if No
(T
) or else T
= Any_Id
then
14517 F
:= First_Formal
(Nam
);
14518 while Present
(F
) loop
14519 Num_F
:= Num_F
+ 1;
14524 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
14525 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
14526 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
14527 Attribute_Unbiased_Rounding
=>
14530 and then Is_Floating_Point_Type
(T
);
14532 when Attribute_Image | Attribute_Pred | Attribute_Succ |
14533 Attribute_Value | Attribute_Wide_Image |
14534 Attribute_Wide_Value
=>
14535 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
14537 when Attribute_Max | Attribute_Min
=>
14538 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
14540 when Attribute_Input
=>
14541 OK
:= (Is_Fun
and then Num_F
= 1);
14543 when Attribute_Output | Attribute_Read | Attribute_Write
=>
14544 OK
:= (not Is_Fun
and then Num_F
= 2);
14551 Error_Msg_N
("attribute reference has wrong profile for subprogram",
14554 end Valid_Default_Attribute
;