1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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 Atree
; use Atree
;
27 with Einfo
; use Einfo
;
28 with Elists
; use Elists
;
29 with Errout
; use Errout
;
30 with Expander
; use Expander
;
31 with Fname
; use Fname
;
32 with Fname
.UF
; use Fname
.UF
;
33 with Freeze
; use Freeze
;
36 with Lib
.Load
; use Lib
.Load
;
37 with Lib
.Xref
; use Lib
.Xref
;
38 with Nlists
; use Nlists
;
39 with Namet
; use Namet
;
40 with Nmake
; use Nmake
;
42 with Rident
; use Rident
;
43 with Restrict
; use Restrict
;
44 with Rtsfind
; use Rtsfind
;
46 with Sem_Cat
; use Sem_Cat
;
47 with Sem_Ch3
; use Sem_Ch3
;
48 with Sem_Ch6
; use Sem_Ch6
;
49 with Sem_Ch7
; use Sem_Ch7
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Ch10
; use Sem_Ch10
;
52 with Sem_Ch13
; use Sem_Ch13
;
53 with Sem_Disp
; use Sem_Disp
;
54 with Sem_Elab
; use Sem_Elab
;
55 with Sem_Elim
; use Sem_Elim
;
56 with Sem_Eval
; use Sem_Eval
;
57 with Sem_Res
; use Sem_Res
;
58 with Sem_Type
; use Sem_Type
;
59 with Sem_Util
; use Sem_Util
;
60 with Sem_Warn
; use Sem_Warn
;
61 with Stand
; use Stand
;
62 with Sinfo
; use Sinfo
;
63 with Sinfo
.CN
; use Sinfo
.CN
;
64 with Sinput
; use Sinput
;
65 with Sinput
.L
; use Sinput
.L
;
66 with Snames
; use Snames
;
67 with Stringt
; use Stringt
;
68 with Uname
; use Uname
;
70 with Tbuild
; use Tbuild
;
71 with Uintp
; use Uintp
;
72 with Urealp
; use Urealp
;
76 package body Sem_Ch12
is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 ----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to share
83 -- generic instantiations (for now). Analysis of a generic definition does
84 -- not perform any expansion action, but the expander must be called on the
85 -- tree for each instantiation, because the expansion may of course depend
86 -- on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponding actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is static
224 -- error which must be detected at compile time. The detection of these
225 -- circularities is carried out at the point that we insert a generic
226 -- instance spec or body. If there is a circularity, then the analysis of
227 -- the offending spec or body will eventually result in trying to load the
228 -- same unit again, and we detect this problem as we analyze the package
229 -- instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we get
232 -- into trouble if we try to keep going. The following flag is set if a
233 -- circularity is detected, and used to abandon compilation after the
234 -- messages have been posted.
236 Circularity_Detected
: Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -------------------------------------------------
241 -- Formal packages and partial parametrization --
242 -------------------------------------------------
244 -- When compiling a generic, a formal package is a local instantiation. If
245 -- declared with a box, its generic formals are visible in the enclosing
246 -- generic. If declared with a partial list of actuals, those actuals that
247 -- are defaulted (covered by an Others clause, or given an explicit box
248 -- initialization) are also visible in the enclosing generic, while those
249 -- that have a corresponding actual are not.
251 -- In our source model of instantiation, the same visibility must be
252 -- present in the spec and body of an instance: the names of the formals
253 -- that are defaulted must be made visible within the instance, and made
254 -- invisible (hidden) after the instantiation is complete, so that they
255 -- are not accessible outside of the instance.
257 -- In a generic, a formal package is treated like a special instantiation.
258 -- Our Ada95 compiler handled formals with and without box in different
259 -- ways. With partial parametrization, we use a single model for both.
260 -- We create a package declaration that consists of the specification of
261 -- the generic package, and a set of declarations that map the actuals
262 -- into local renamings, just as we do for bona fide instantiations. For
263 -- defaulted parameters and formals with a box, we copy directly the
264 -- declarations of the formal into this local package. The result is a
265 -- a package whose visible declarations may include generic formals. This
266 -- package is only used for type checking and visibility analysis, and
267 -- never reaches the back-end, so it can freely violate the placement
268 -- rules for generic formal declarations.
270 -- The list of declarations (renamings and copies of formals) is built
271 -- by Analyze_Associations, just as for regular instantiations.
273 -- At the point of instantiation, conformance checking must be applied only
274 -- to those parameters that were specified in the formal. We perform this
275 -- checking by creating another internal instantiation, this one including
276 -- only the renamings and the formals (the rest of the package spec is not
277 -- relevant to conformance checking). We can then traverse two lists: the
278 -- list of actuals in the instance that corresponds to the formal package,
279 -- and the list of actuals produced for this bogus instantiation. We apply
280 -- the conformance rules to those actuals that are not defaulted (i.e.
281 -- which still appear as generic formals.
283 -- When we compile an instance body we must make the right parameters
284 -- visible again. The predicate Is_Generic_Formal indicates which of the
285 -- formals should have its Is_Hidden flag reset.
287 -----------------------
288 -- Local subprograms --
289 -----------------------
291 procedure Abandon_Instantiation
(N
: Node_Id
);
292 pragma No_Return
(Abandon_Instantiation
);
293 -- Posts an error message "instantiation abandoned" at the indicated node
294 -- and then raises the exception Instantiation_Error to do it.
296 procedure Analyze_Formal_Array_Type
297 (T
: in out Entity_Id
;
299 -- A formal array type is treated like an array type declaration, and
300 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
301 -- in-out, because in the case of an anonymous type the entity is
302 -- actually created in the procedure.
304 -- The following procedures treat other kinds of formal parameters
306 procedure Analyze_Formal_Derived_Interface_Type
311 procedure Analyze_Formal_Derived_Type
316 procedure Analyze_Formal_Interface_Type
321 -- The following subprograms create abbreviated declarations for formal
322 -- scalar types. We introduce an anonymous base of the proper class for
323 -- each of them, and define the formals as constrained first subtypes of
324 -- their bases. The bounds are expressions that are non-static in the
327 procedure Analyze_Formal_Decimal_Fixed_Point_Type
328 (T
: Entity_Id
; Def
: Node_Id
);
329 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
330 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
331 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
332 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
333 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
334 (T
: Entity_Id
; Def
: Node_Id
);
336 procedure Analyze_Formal_Private_Type
340 -- Creates a new private type, which does not require completion
342 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
344 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
345 -- Create a new access type with the given designated type
347 function Analyze_Associations
350 F_Copy
: List_Id
) return List_Id
;
351 -- At instantiation time, build the list of associations between formals
352 -- and actuals. Each association becomes a renaming declaration for the
353 -- formal entity. F_Copy is the analyzed list of formals in the generic
354 -- copy. It is used to apply legality checks to the actuals. I_Node is the
355 -- instantiation node itself.
357 procedure Analyze_Subprogram_Instantiation
361 procedure Build_Instance_Compilation_Unit_Nodes
365 -- This procedure is used in the case where the generic instance of a
366 -- subprogram body or package body is a library unit. In this case, the
367 -- original library unit node for the generic instantiation must be
368 -- replaced by the resulting generic body, and a link made to a new
369 -- compilation unit node for the generic declaration. The argument N is
370 -- the original generic instantiation. Act_Body and Act_Decl are the body
371 -- and declaration of the instance (either package body and declaration
372 -- nodes or subprogram body and declaration nodes depending on the case).
373 -- On return, the node N has been rewritten with the actual body.
375 procedure Check_Access_Definition
(N
: Node_Id
);
376 -- Subsidiary routine to null exclusion processing. Perform an assertion
377 -- check on Ada version and the presence of an access definition in N.
379 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
380 -- Apply the following to all formal packages in generic associations
382 procedure Check_Formal_Package_Instance
383 (Formal_Pack
: Entity_Id
;
384 Actual_Pack
: Entity_Id
);
385 -- Verify that the actuals of the actual instance match the actuals of
386 -- the template for a formal package that is not declared with a box.
388 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
389 -- If the generic is a local entity and the corresponding body has not
390 -- been seen yet, flag enclosing packages to indicate that it will be
391 -- elaborated after the generic body. Subprograms declared in the same
392 -- package cannot be inlined by the front-end because front-end inlining
393 -- requires a strict linear order of elaboration.
395 procedure Check_Hidden_Child_Unit
397 Gen_Unit
: Entity_Id
;
398 Act_Decl_Id
: Entity_Id
);
399 -- If the generic unit is an implicit child instance within a parent
400 -- instance, we need to make an explicit test that it is not hidden by
401 -- a child instance of the same name and parent.
403 procedure Check_Generic_Actuals
404 (Instance
: Entity_Id
;
405 Is_Formal_Box
: Boolean);
406 -- Similar to previous one. Check the actuals in the instantiation,
407 -- whose views can change between the point of instantiation and the point
408 -- of instantiation of the body. In addition, mark the generic renamings
409 -- as generic actuals, so that they are not compatible with other actuals.
410 -- Recurse on an actual that is a formal package whose declaration has
413 function Contains_Instance_Of
416 N
: Node_Id
) return Boolean;
417 -- Inner is instantiated within the generic Outer. Check whether Inner
418 -- directly or indirectly contains an instance of Outer or of one of its
419 -- parents, in the case of a subunit. Each generic unit holds a list of
420 -- the entities instantiated within (at any depth). This procedure
421 -- determines whether the set of such lists contains a cycle, i.e. an
422 -- illegal circular instantiation.
424 function Denotes_Formal_Package
426 On_Exit
: Boolean := False) return Boolean;
427 -- Returns True if E is a formal package of an enclosing generic, or
428 -- the actual for such a formal in an enclosing instantiation. If such
429 -- a package is used as a formal in an nested generic, or as an actual
430 -- in a nested instantiation, the visibility of ITS formals should not
431 -- be modified. When called from within Restore_Private_Views, the flag
432 -- On_Exit is true, to indicate that the search for a possible enclosing
433 -- instance should ignore the current one.
435 function Find_Actual_Type
437 Gen_Type
: Entity_Id
) return Entity_Id
;
438 -- When validating the actual types of a child instance, check whether
439 -- the formal is a formal type of the parent unit, and retrieve the current
440 -- actual for it. Typ is the entity in the analyzed formal type declaration
441 -- (component or index type of an array type, or designated type of an
442 -- access formal) and Gen_Type is the enclosing analyzed formal array
443 -- or access type. The desired actual may be a formal of a parent, or may
444 -- be declared in a formal package of a parent. In both cases it is a
445 -- generic actual type because it appears within a visible instance.
446 -- Finally, it may be declared in a parent unit without being a formal
447 -- of that unit, in which case it must be retrieved by visibility.
448 -- Ambiguities may still arise if two homonyms are declared in two formal
449 -- packages, and the prefix of the formal type may be needed to resolve
450 -- the ambiguity in the instance ???
452 function In_Same_Declarative_Part
454 Inst
: Node_Id
) return Boolean;
455 -- True if the instantiation Inst and the given freeze_node F_Node appear
456 -- within the same declarative part, ignoring subunits, but with no inter-
457 -- vening subprograms or concurrent units. If true, the freeze node
458 -- of the instance can be placed after the freeze node of the parent,
459 -- which it itself an instance.
461 function In_Main_Context
(E
: Entity_Id
) return Boolean;
462 -- Check whether an instantiation is in the context of the main unit.
463 -- Used to determine whether its body should be elaborated to allow
464 -- front-end inlining.
466 function Is_Generic_Formal
(E
: Entity_Id
) return Boolean;
467 -- Utility to determine whether a given entity is declared by means of
468 -- of a formal parameter declaration. Used to set properly the visibility
469 -- of generic formals of a generic package declared with a box or with
470 -- partial parametrization.
472 procedure Set_Instance_Env
473 (Gen_Unit
: Entity_Id
;
474 Act_Unit
: Entity_Id
);
475 -- Save current instance on saved environment, to be used to determine
476 -- the global status of entities in nested instances. Part of Save_Env.
477 -- called after verifying that the generic unit is legal for the instance,
478 -- The procedure also examines whether the generic unit is a predefined
479 -- unit, in order to set configuration switches accordingly. As a result
480 -- the procedure must be called after analyzing and freezing the actuals.
482 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
483 -- Associate analyzed generic parameter with corresponding
484 -- instance. Used for semantic checks at instantiation time.
486 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
487 -- Traverse the Exchanged_Views list to see if a type was private
488 -- and has already been flipped during this phase of instantiation.
490 procedure Hide_Current_Scope
;
491 -- When instantiating a generic child unit, the parent context must be
492 -- present, but the instance and all entities that may be generated
493 -- must be inserted in the current scope. We leave the current scope
494 -- on the stack, but make its entities invisible to avoid visibility
495 -- problems. This is reversed at the end of the instantiation. This is
496 -- not done for the instantiation of the bodies, which only require the
497 -- instances of the generic parents to be in scope.
499 procedure Install_Body
504 -- If the instantiation happens textually before the body of the generic,
505 -- the instantiation of the body must be analyzed after the generic body,
506 -- and not at the point of instantiation. Such early instantiations can
507 -- happen if the generic and the instance appear in a package declaration
508 -- because the generic body can only appear in the corresponding package
509 -- body. Early instantiations can also appear if generic, instance and
510 -- body are all in the declarative part of a subprogram or entry. Entities
511 -- of packages that are early instantiations are delayed, and their freeze
512 -- node appears after the generic body.
514 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
515 -- Insert freeze node at the end of the declarative part that includes the
516 -- instance node N. If N is in the visible part of an enclosing package
517 -- declaration, the freeze node has to be inserted at the end of the
518 -- private declarations, if any.
520 procedure Freeze_Subprogram_Body
521 (Inst_Node
: Node_Id
;
523 Pack_Id
: Entity_Id
);
524 -- The generic body may appear textually after the instance, including
525 -- in the proper body of a stub, or within a different package instance.
526 -- Given that the instance can only be elaborated after the generic, we
527 -- place freeze_nodes for the instance and/or for packages that may enclose
528 -- the instance and the generic, so that the back-end can establish the
529 -- proper order of elaboration.
532 -- Establish environment for subsequent instantiation. Separated from
533 -- Save_Env because data-structures for visibility handling must be
534 -- initialized before call to Check_Generic_Child_Unit.
536 procedure Install_Formal_Packages
(Par
: Entity_Id
);
537 -- If any of the formals of the parent are formal packages with box,
538 -- their formal parts are visible in the parent and thus in the child
539 -- unit as well. Analogous to what is done in Check_Generic_Actuals
540 -- for the unit itself. This procedure is also used in an instance, to
541 -- make visible the proper entities of the actual for a formal package
542 -- declared with a box.
544 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
545 -- When compiling an instance of a child unit the parent (which is
546 -- itself an instance) is an enclosing scope that must be made
547 -- immediately visible. This procedure is also used to install the non-
548 -- generic parent of a generic child unit when compiling its body, so
549 -- that full views of types in the parent are made visible.
551 procedure Remove_Parent
(In_Body
: Boolean := False);
552 -- Reverse effect after instantiation of child is complete
554 procedure Inline_Instance_Body
556 Gen_Unit
: Entity_Id
;
558 -- If front-end inlining is requested, instantiate the package body,
559 -- and preserve the visibility of its compilation unit, to insure
560 -- that successive instantiations succeed.
562 -- The functions Instantiate_XXX perform various legality checks and build
563 -- the declarations for instantiated generic parameters. In all of these
564 -- Formal is the entity in the generic unit, Actual is the entity of
565 -- expression in the generic associations, and Analyzed_Formal is the
566 -- formal in the generic copy, which contains the semantic information to
567 -- be used to validate the actual.
569 function Instantiate_Object
572 Analyzed_Formal
: Node_Id
) return List_Id
;
574 function Instantiate_Type
577 Analyzed_Formal
: Node_Id
;
578 Actual_Decls
: List_Id
) return List_Id
;
580 function Instantiate_Formal_Subprogram
583 Analyzed_Formal
: Node_Id
) return Node_Id
;
585 function Instantiate_Formal_Package
588 Analyzed_Formal
: Node_Id
) return List_Id
;
589 -- If the formal package is declared with a box, special visibility rules
590 -- apply to its formals: they are in the visible part of the package. This
591 -- is true in the declarative region of the formal package, that is to say
592 -- in the enclosing generic or instantiation. For an instantiation, the
593 -- parameters of the formal package are made visible in an explicit step.
594 -- Furthermore, if the actual has a visible USE clause, these formals must
595 -- be made potentially use-visible as well. On exit from the enclosing
596 -- instantiation, the reverse must be done.
598 -- For a formal package declared without a box, there are conformance rules
599 -- that apply to the actuals in the generic declaration and the actuals of
600 -- the actual package in the enclosing instantiation. The simplest way to
601 -- apply these rules is to repeat the instantiation of the formal package
602 -- in the context of the enclosing instance, and compare the generic
603 -- associations of this instantiation with those of the actual package.
604 -- This internal instantiation only needs to contain the renamings of the
605 -- formals: the visible and private declarations themselves need not be
608 -- In Ada 2005, the formal package may be only partially parametrized. In
609 -- that case the visibility step must make visible those actuals whose
610 -- corresponding formals were given with a box. A final complication
611 -- involves inherited operations from formal derived types, which must be
612 -- visible if the type is.
614 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
615 -- Test if given node is in the main unit
617 procedure Load_Parent_Of_Generic
620 Body_Optional
: Boolean := False);
621 -- If the generic appears in a separate non-generic library unit, load the
622 -- corresponding body to retrieve the body of the generic. N is the node
623 -- for the generic instantiation, Spec is the generic package declaration.
625 -- Body_Optional is a flag that indicates that the body is being loaded to
626 -- ensure that temporaries are generated consistently when there are other
627 -- instances in the current declarative part that precede the one being
628 -- loaded. In that case a missing body is acceptable.
630 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
631 -- Add the context clause of the unit containing a generic unit to an
632 -- instantiation that is a compilation unit.
634 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
635 -- In order to propagate semantic information back from the analyzed copy
636 -- to the original generic, we maintain links between selected nodes in the
637 -- generic and their corresponding copies. At the end of generic analysis,
638 -- the routine Save_Global_References traverses the generic tree, examines
639 -- the semantic information, and preserves the links to those nodes that
640 -- contain global information. At instantiation, the information from the
641 -- associated node is placed on the new copy, so that name resolution is
644 -- Three kinds of source nodes have associated nodes:
646 -- a) those that can reference (denote) entities, that is identifiers,
647 -- character literals, expanded_names, operator symbols, operators,
648 -- and attribute reference nodes. These nodes have an Entity field
649 -- and are the set of nodes that are in N_Has_Entity.
651 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
653 -- c) selected components (N_Selected_Component)
655 -- For the first class, the associated node preserves the entity if it is
656 -- global. If the generic contains nested instantiations, the associated
657 -- node itself has been recopied, and a chain of them must be followed.
659 -- For aggregates, the associated node allows retrieval of the type, which
660 -- may otherwise not appear in the generic. The view of this type may be
661 -- different between generic and instantiation, and the full view can be
662 -- installed before the instantiation is analyzed. For aggregates of type
663 -- extensions, the same view exchange may have to be performed for some of
664 -- the ancestor types, if their view is private at the point of
667 -- Nodes that are selected components in the parse tree may be rewritten
668 -- as expanded names after resolution, and must be treated as potential
669 -- entity holders, which is why they also have an Associated_Node.
671 -- Nodes that do not come from source, such as freeze nodes, do not appear
672 -- in the generic tree, and need not have an associated node.
674 -- The associated node is stored in the Associated_Node field. Note that
675 -- this field overlaps Entity, which is fine, because the whole point is
676 -- that we don't need or want the normal Entity field in this situation.
678 procedure Move_Freeze_Nodes
682 -- Freeze nodes can be generated in the analysis of a generic unit, but
683 -- will not be seen by the back-end. It is necessary to move those nodes
684 -- to the enclosing scope if they freeze an outer entity. We place them
685 -- at the end of the enclosing generic package, which is semantically
688 procedure Preanalyze_Actuals
(N
: Node_Id
);
689 -- Analyze actuals to perform name resolution. Full resolution is done
690 -- later, when the expected types are known, but names have to be captured
691 -- before installing parents of generics, that are not visible for the
692 -- actuals themselves.
694 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
695 -- Verify that an attribute that appears as the default for a formal
696 -- subprogram is a function or procedure with the correct profile.
698 -------------------------------------------
699 -- Data Structures for Generic Renamings --
700 -------------------------------------------
702 -- The map Generic_Renamings associates generic entities with their
703 -- corresponding actuals. Currently used to validate type instances. It
704 -- will eventually be used for all generic parameters to eliminate the
705 -- need for overload resolution in the instance.
707 type Assoc_Ptr
is new Int
;
709 Assoc_Null
: constant Assoc_Ptr
:= -1;
714 Next_In_HTable
: Assoc_Ptr
;
717 package Generic_Renamings
is new Table
.Table
718 (Table_Component_Type
=> Assoc
,
719 Table_Index_Type
=> Assoc_Ptr
,
720 Table_Low_Bound
=> 0,
722 Table_Increment
=> 100,
723 Table_Name
=> "Generic_Renamings");
725 -- Variable to hold enclosing instantiation. When the environment is
726 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
728 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
730 -- Hash table for associations
732 HTable_Size
: constant := 37;
733 type HTable_Range
is range 0 .. HTable_Size
- 1;
735 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
736 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
737 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
738 function Hash
(F
: Entity_Id
) return HTable_Range
;
740 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
741 Header_Num
=> HTable_Range
,
743 Elmt_Ptr
=> Assoc_Ptr
,
744 Null_Ptr
=> Assoc_Null
,
745 Set_Next
=> Set_Next_Assoc
,
748 Get_Key
=> Get_Gen_Id
,
752 Exchanged_Views
: Elist_Id
;
753 -- This list holds the private views that have been exchanged during
754 -- instantiation to restore the visibility of the generic declaration.
755 -- (see comments above). After instantiation, the current visibility is
756 -- reestablished by means of a traversal of this list.
758 Hidden_Entities
: Elist_Id
;
759 -- This list holds the entities of the current scope that are removed
760 -- from immediate visibility when instantiating a child unit. Their
761 -- visibility is restored in Remove_Parent.
763 -- Because instantiations can be recursive, the following must be saved
764 -- on entry and restored on exit from an instantiation (spec or body).
765 -- This is done by the two procedures Save_Env and Restore_Env. For
766 -- package and subprogram instantiations (but not for the body instances)
767 -- the action of Save_Env is done in two steps: Init_Env is called before
768 -- Check_Generic_Child_Unit, because setting the parent instances requires
769 -- that the visibility data structures be properly initialized. Once the
770 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
772 Parent_Unit_Visible
: Boolean := False;
773 -- Parent_Unit_Visible is used when the generic is a child unit, and
774 -- indicates whether the ultimate parent of the generic is visible in the
775 -- instantiation environment. It is used to reset the visibility of the
776 -- parent at the end of the instantiation (see Remove_Parent).
778 Instance_Parent_Unit
: Entity_Id
:= Empty
;
779 -- This records the ultimate parent unit of an instance of a generic
780 -- child unit and is used in conjunction with Parent_Unit_Visible to
781 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
783 type Instance_Env
is record
784 Instantiated_Parent
: Assoc
;
785 Exchanged_Views
: Elist_Id
;
786 Hidden_Entities
: Elist_Id
;
787 Current_Sem_Unit
: Unit_Number_Type
;
788 Parent_Unit_Visible
: Boolean := False;
789 Instance_Parent_Unit
: Entity_Id
:= Empty
;
790 Switches
: Config_Switches_Type
;
793 package Instance_Envs
is new Table
.Table
(
794 Table_Component_Type
=> Instance_Env
,
795 Table_Index_Type
=> Int
,
796 Table_Low_Bound
=> 0,
798 Table_Increment
=> 100,
799 Table_Name
=> "Instance_Envs");
801 procedure Restore_Private_Views
802 (Pack_Id
: Entity_Id
;
803 Is_Package
: Boolean := True);
804 -- Restore the private views of external types, and unmark the generic
805 -- renamings of actuals, so that they become compatible subtypes again.
806 -- For subprograms, Pack_Id is the package constructed to hold the
809 procedure Switch_View
(T
: Entity_Id
);
810 -- Switch the partial and full views of a type and its private
811 -- dependents (i.e. its subtypes and derived types).
813 ------------------------------------
814 -- Structures for Error Reporting --
815 ------------------------------------
817 Instantiation_Node
: Node_Id
;
818 -- Used by subprograms that validate instantiation of formal parameters
819 -- where there might be no actual on which to place the error message.
820 -- Also used to locate the instantiation node for generic subunits.
822 Instantiation_Error
: exception;
823 -- When there is a semantic error in the generic parameter matching,
824 -- there is no point in continuing the instantiation, because the
825 -- number of cascaded errors is unpredictable. This exception aborts
826 -- the instantiation process altogether.
828 S_Adjustment
: Sloc_Adjustment
;
829 -- Offset created for each node in an instantiation, in order to keep
830 -- track of the source position of the instantiation in each of its nodes.
831 -- A subsequent semantic error or warning on a construct of the instance
832 -- points to both places: the original generic node, and the point of
833 -- instantiation. See Sinput and Sinput.L for additional details.
835 ------------------------------------------------------------
836 -- Data structure for keeping track when inside a Generic --
837 ------------------------------------------------------------
839 -- The following table is used to save values of the Inside_A_Generic
840 -- flag (see spec of Sem) when they are saved by Start_Generic.
842 package Generic_Flags
is new Table
.Table
(
843 Table_Component_Type
=> Boolean,
844 Table_Index_Type
=> Int
,
845 Table_Low_Bound
=> 0,
847 Table_Increment
=> 200,
848 Table_Name
=> "Generic_Flags");
850 ---------------------------
851 -- Abandon_Instantiation --
852 ---------------------------
854 procedure Abandon_Instantiation
(N
: Node_Id
) is
856 Error_Msg_N
("\instantiation abandoned!", N
);
857 raise Instantiation_Error
;
858 end Abandon_Instantiation
;
860 --------------------------
861 -- Analyze_Associations --
862 --------------------------
864 function Analyze_Associations
867 F_Copy
: List_Id
) return List_Id
869 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
870 Assoc
: constant List_Id
:= New_List
;
871 Default_Actuals
: constant Elist_Id
:= New_Elmt_List
;
872 Gen_Unit
: constant Entity_Id
:= Defining_Entity
(Parent
(F_Copy
));
876 Next_Formal
: Node_Id
;
877 Temp_Formal
: Node_Id
;
878 Analyzed_Formal
: Node_Id
;
881 First_Named
: Node_Id
:= Empty
;
883 Default_Formals
: constant List_Id
:= New_List
;
884 -- If an Other_Choice is present, some of the formals may be defaulted.
885 -- To simplify the treatment of visibility in an instance, we introduce
886 -- individual defaults for each such formal. These defaults are
887 -- appended to the list of associations and replace the Others_Choice.
889 Found_Assoc
: Node_Id
;
890 -- Association for the current formal being match. Empty if there are
891 -- no remaining actuals, or if there is no named association with the
892 -- name of the formal.
894 Is_Named_Assoc
: Boolean;
895 Num_Matched
: Int
:= 0;
896 Num_Actuals
: Int
:= 0;
898 Others_Present
: Boolean := False;
899 -- In Ada 2005, indicates partial parametrization of of a formal
900 -- package. As usual an others association must be last in the list.
902 function Matching_Actual
904 A_F
: Entity_Id
) return Node_Id
;
905 -- Find actual that corresponds to a given a formal parameter. If the
906 -- actuals are positional, return the next one, if any. If the actuals
907 -- are named, scan the parameter associations to find the right one.
908 -- A_F is the corresponding entity in the analyzed generic,which is
909 -- placed on the selector name for ASIS use.
911 -- In Ada 2005, a named association may be given with a box, in which
912 -- case Matching_Actual sets Found_Assoc to the generic association,
913 -- but return Empty for the actual itself. In this case the code below
914 -- creates a corresponding declaration for the formal.
916 function Partial_Parametrization
return Boolean;
917 -- Ada 2005: if no match is found for a given formal, check if the
918 -- association for it includes a box, or whether the associations
919 -- include an Others clause.
921 procedure Process_Default
(F
: Entity_Id
);
922 -- Add a copy of the declaration of generic formal F to the list of
923 -- associations, and add an explicit box association for F if there
924 -- is none yet, and the default comes from an Others_Choice.
926 procedure Set_Analyzed_Formal
;
927 -- Find the node in the generic copy that corresponds to a given formal.
928 -- The semantic information on this node is used to perform legality
929 -- checks on the actuals. Because semantic analysis can introduce some
930 -- anonymous entities or modify the declaration node itself, the
931 -- correspondence between the two lists is not one-one. In addition to
932 -- anonymous types, the presence a formal equality will introduce an
933 -- implicit declaration for the corresponding inequality.
935 ---------------------
936 -- Matching_Actual --
937 ---------------------
939 function Matching_Actual
941 A_F
: Entity_Id
) return Node_Id
947 Is_Named_Assoc
:= False;
949 -- End of list of purely positional parameters
952 or else Nkind
(Actual
) = N_Others_Choice
954 Found_Assoc
:= Empty
;
957 -- Case of positional parameter corresponding to current formal
959 elsif No
(Selector_Name
(Actual
)) then
960 Found_Assoc
:= Actual
;
961 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
962 Num_Matched
:= Num_Matched
+ 1;
965 -- Otherwise scan list of named actuals to find the one with the
966 -- desired name. All remaining actuals have explicit names.
969 Is_Named_Assoc
:= True;
970 Found_Assoc
:= Empty
;
974 while Present
(Actual
) loop
975 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
976 Set_Entity
(Selector_Name
(Actual
), A_F
);
977 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
978 Generate_Reference
(A_F
, Selector_Name
(Actual
));
979 Found_Assoc
:= Actual
;
980 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
981 Num_Matched
:= Num_Matched
+ 1;
989 -- Reset for subsequent searches. In most cases the named
990 -- associations are in order. If they are not, we reorder them
991 -- to avoid scanning twice the same actual. This is not just a
992 -- question of efficiency: there may be multiple defaults with
993 -- boxes that have the same name. In a nested instantiation we
994 -- insert actuals for those defaults, and cannot rely on their
995 -- names to disambiguate them.
997 if Actual
= First_Named
then
1000 elsif Present
(Actual
) then
1001 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1004 Actual
:= First_Named
;
1007 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1008 Set_Used_As_Generic_Actual
(Entity
(Act
));
1012 end Matching_Actual
;
1014 -----------------------------
1015 -- Partial_Parametrization --
1016 -----------------------------
1018 function Partial_Parametrization
return Boolean is
1020 return Others_Present
1021 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1022 end Partial_Parametrization
;
1024 ---------------------
1025 -- Process_Default --
1026 ---------------------
1028 procedure Process_Default
(F
: Entity_Id
) is
1029 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1030 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1037 -- Append copy of formal declaration to associations, and create
1038 -- new defining identifier for it.
1040 Decl
:= New_Copy_Tree
(F
);
1041 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
=> Chars
(F_Id
));
1043 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1044 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1047 Set_Defining_Identifier
(Decl
, Id
);
1050 Append
(Decl
, Assoc
);
1052 if No
(Found_Assoc
) then
1054 Make_Generic_Association
(Loc
,
1055 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
),
1056 Explicit_Generic_Actual_Parameter
=> Empty
);
1057 Set_Box_Present
(Default
);
1058 Append
(Default
, Default_Formals
);
1060 end Process_Default
;
1062 -------------------------
1063 -- Set_Analyzed_Formal --
1064 -------------------------
1066 procedure Set_Analyzed_Formal
is
1070 while Present
(Analyzed_Formal
) loop
1071 Kind
:= Nkind
(Analyzed_Formal
);
1073 case Nkind
(Formal
) is
1075 when N_Formal_Subprogram_Declaration
=>
1076 exit when Kind
in N_Formal_Subprogram_Declaration
1079 (Defining_Unit_Name
(Specification
(Formal
))) =
1081 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1083 when N_Formal_Package_Declaration
=>
1084 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1085 N_Generic_Package_Declaration
,
1086 N_Package_Declaration
);
1088 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
1092 -- Skip freeze nodes, and nodes inserted to replace
1093 -- unrecognized pragmas.
1096 Kind
not in N_Formal_Subprogram_Declaration
1097 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1101 and then Chars
(Defining_Identifier
(Formal
)) =
1102 Chars
(Defining_Identifier
(Analyzed_Formal
));
1105 Next
(Analyzed_Formal
);
1107 end Set_Analyzed_Formal
;
1109 -- Start of processing for Analyze_Associations
1112 Actuals
:= Generic_Associations
(I_Node
);
1114 if Present
(Actuals
) then
1116 -- check for an Others choice, indicating a partial parametrization
1117 -- for a formal package.
1119 Actual
:= First
(Actuals
);
1120 while Present
(Actual
) loop
1121 if Nkind
(Actual
) = N_Others_Choice
then
1122 Others_Present
:= True;
1124 if Present
(Next
(Actual
)) then
1125 Error_Msg_N
("others must be last association", Actual
);
1128 -- This subprogram is used both for formal packages and for
1129 -- instantiations. For the latter, associations must all be
1132 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1133 and then Comes_From_Source
(I_Node
)
1136 ("others association not allowed in an instance",
1140 -- In any case, nothing to do after the others association
1144 elsif Box_Present
(Actual
)
1145 and then Comes_From_Source
(I_Node
)
1146 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1149 ("box association not allowed in an instance", Actual
);
1155 -- If named associations are present, save first named association
1156 -- (it may of course be Empty) to facilitate subsequent name search.
1158 First_Named
:= First
(Actuals
);
1159 while Present
(First_Named
)
1160 and then Nkind
(First_Named
) /= N_Others_Choice
1161 and then No
(Selector_Name
(First_Named
))
1163 Num_Actuals
:= Num_Actuals
+ 1;
1168 Named
:= First_Named
;
1169 while Present
(Named
) loop
1170 if Nkind
(Named
) /= N_Others_Choice
1171 and then No
(Selector_Name
(Named
))
1173 Error_Msg_N
("invalid positional actual after named one", Named
);
1174 Abandon_Instantiation
(Named
);
1177 -- A named association may lack an actual parameter, if it was
1178 -- introduced for a default subprogram that turns out to be local
1179 -- to the outer instantiation.
1181 if Nkind
(Named
) /= N_Others_Choice
1182 and then Present
(Explicit_Generic_Actual_Parameter
(Named
))
1184 Num_Actuals
:= Num_Actuals
+ 1;
1190 if Present
(Formals
) then
1191 Formal
:= First_Non_Pragma
(Formals
);
1192 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1194 if Present
(Actuals
) then
1195 Actual
:= First
(Actuals
);
1197 -- All formals should have default values
1203 while Present
(Formal
) loop
1204 Set_Analyzed_Formal
;
1205 Next_Formal
:= Next_Non_Pragma
(Formal
);
1207 case Nkind
(Formal
) is
1208 when N_Formal_Object_Declaration
=>
1211 Defining_Identifier
(Formal
),
1212 Defining_Identifier
(Analyzed_Formal
));
1214 if No
(Match
) and then Partial_Parametrization
then
1215 Process_Default
(Formal
);
1218 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1222 when N_Formal_Type_Declaration
=>
1225 Defining_Identifier
(Formal
),
1226 Defining_Identifier
(Analyzed_Formal
));
1229 if Partial_Parametrization
then
1230 Process_Default
(Formal
);
1233 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1237 Defining_Identifier
(Formal
));
1238 Error_Msg_NE
("\in instantiation of & declared#",
1239 Instantiation_Node
, Gen_Unit
);
1240 Abandon_Instantiation
(Instantiation_Node
);
1247 (Formal
, Match
, Analyzed_Formal
, Assoc
),
1250 -- An instantiation is a freeze point for the actuals,
1251 -- unless this is a rewritten formal package.
1253 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1254 Append_Elmt
(Entity
(Match
), Actual_Types
);
1258 -- A remote access-to-class-wide type must not be an
1259 -- actual parameter for a generic formal of an access
1260 -- type (E.2.2 (17)).
1262 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1264 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1265 N_Access_To_Object_Definition
1267 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1270 when N_Formal_Subprogram_Declaration
=>
1273 Defining_Unit_Name
(Specification
(Formal
)),
1274 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1276 -- If the formal subprogram has the same name as
1277 -- another formal subprogram of the generic, then
1278 -- a named association is illegal (12.3(9)). Exclude
1279 -- named associations that are generated for a nested
1283 and then Is_Named_Assoc
1284 and then Comes_From_Source
(Found_Assoc
)
1286 Temp_Formal
:= First
(Formals
);
1287 while Present
(Temp_Formal
) loop
1288 if Nkind
(Temp_Formal
) in
1289 N_Formal_Subprogram_Declaration
1290 and then Temp_Formal
/= Formal
1292 Chars
(Selector_Name
(Found_Assoc
)) =
1293 Chars
(Defining_Unit_Name
1294 (Specification
(Temp_Formal
)))
1297 ("name not allowed for overloaded formal",
1299 Abandon_Instantiation
(Instantiation_Node
);
1306 -- If there is no corresponding actual, this may be case of
1307 -- partial parametrization, or else the formal has a default
1311 and then Partial_Parametrization
1313 Process_Default
(Formal
);
1316 Instantiate_Formal_Subprogram
1317 (Formal
, Match
, Analyzed_Formal
));
1320 -- If this is a nested generic, preserve default for later
1324 and then Box_Present
(Formal
)
1327 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1331 when N_Formal_Package_Declaration
=>
1334 Defining_Identifier
(Formal
),
1335 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1338 if Partial_Parametrization
then
1339 Process_Default
(Formal
);
1342 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1345 Instantiation_Node
, Defining_Identifier
(Formal
));
1346 Error_Msg_NE
("\in instantiation of & declared#",
1347 Instantiation_Node
, Gen_Unit
);
1349 Abandon_Instantiation
(Instantiation_Node
);
1355 (Instantiate_Formal_Package
1356 (Formal
, Match
, Analyzed_Formal
),
1360 -- For use type and use package appearing in the generic part,
1361 -- we have already copied them, so we can just move them where
1362 -- they belong (we mustn't recopy them since this would mess up
1363 -- the Sloc values).
1365 when N_Use_Package_Clause |
1366 N_Use_Type_Clause
=>
1367 if Nkind
(Original_Node
(I_Node
)) =
1368 N_Formal_Package_Declaration
1370 Append
(New_Copy_Tree
(Formal
), Assoc
);
1373 Append
(Formal
, Assoc
);
1377 raise Program_Error
;
1381 Formal
:= Next_Formal
;
1382 Next_Non_Pragma
(Analyzed_Formal
);
1385 if Num_Actuals
> Num_Matched
then
1386 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1388 if Present
(Selector_Name
(Actual
)) then
1390 ("unmatched actual&",
1391 Actual
, Selector_Name
(Actual
));
1392 Error_Msg_NE
("\in instantiation of& declared#",
1396 ("unmatched actual in instantiation of& declared#",
1401 elsif Present
(Actuals
) then
1403 ("too many actuals in generic instantiation", Instantiation_Node
);
1407 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1410 while Present
(Elmt
) loop
1411 Freeze_Before
(I_Node
, Node
(Elmt
));
1416 -- If there are default subprograms, normalize the tree by adding
1417 -- explicit associations for them. This is required if the instance
1418 -- appears within a generic.
1426 Elmt
:= First_Elmt
(Default_Actuals
);
1427 while Present
(Elmt
) loop
1428 if No
(Actuals
) then
1429 Actuals
:= New_List
;
1430 Set_Generic_Associations
(I_Node
, Actuals
);
1433 Subp
:= Node
(Elmt
);
1435 Make_Generic_Association
(Sloc
(Subp
),
1436 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1437 Explicit_Generic_Actual_Parameter
=>
1438 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1439 Mark_Rewrite_Insertion
(New_D
);
1440 Append_To
(Actuals
, New_D
);
1445 -- If this is a formal package, normalize the parameter list by adding
1446 -- explicit box associations for the formals that are covered by an
1449 if not Is_Empty_List
(Default_Formals
) then
1450 Append_List
(Default_Formals
, Formals
);
1454 end Analyze_Associations
;
1456 -------------------------------
1457 -- Analyze_Formal_Array_Type --
1458 -------------------------------
1460 procedure Analyze_Formal_Array_Type
1461 (T
: in out Entity_Id
;
1467 -- Treated like a non-generic array declaration, with additional
1472 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1473 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1474 while Present
(DSS
) loop
1475 if Nkind_In
(DSS
, N_Subtype_Indication
,
1477 N_Attribute_Reference
)
1479 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1486 Array_Type_Declaration
(T
, Def
);
1487 Set_Is_Generic_Type
(Base_Type
(T
));
1489 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1490 and then No
(Full_View
(Component_Type
(T
)))
1492 Error_Msg_N
("premature usage of incomplete type", Def
);
1494 -- Check that range constraint is not allowed on the component type
1495 -- of a generic formal array type (AARM 12.5.3(3))
1497 elsif Is_Internal
(Component_Type
(T
))
1498 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1499 and then Nkind
(Original_Node
1500 (Subtype_Indication
(Component_Definition
(Def
)))) =
1501 N_Subtype_Indication
1504 ("in a formal, a subtype indication can only be "
1505 & "a subtype mark (RM 12.5.3(3))",
1506 Subtype_Indication
(Component_Definition
(Def
)));
1509 end Analyze_Formal_Array_Type
;
1511 ---------------------------------------------
1512 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1513 ---------------------------------------------
1515 -- As for other generic types, we create a valid type representation with
1516 -- legal but arbitrary attributes, whose values are never considered
1517 -- static. For all scalar types we introduce an anonymous base type, with
1518 -- the same attributes. We choose the corresponding integer type to be
1519 -- Standard_Integer.
1521 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1525 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1526 Base
: constant Entity_Id
:=
1528 (E_Decimal_Fixed_Point_Type
,
1529 Current_Scope
, Sloc
(Def
), 'G');
1530 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1531 Delta_Val
: constant Ureal
:= Ureal_1
;
1532 Digs_Val
: constant Uint
:= Uint_6
;
1537 Set_Etype
(Base
, Base
);
1538 Set_Size_Info
(Base
, Int_Base
);
1539 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1540 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1541 Set_Digits_Value
(Base
, Digs_Val
);
1542 Set_Delta_Value
(Base
, Delta_Val
);
1543 Set_Small_Value
(Base
, Delta_Val
);
1544 Set_Scalar_Range
(Base
,
1546 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1547 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1549 Set_Is_Generic_Type
(Base
);
1550 Set_Parent
(Base
, Parent
(Def
));
1552 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1553 Set_Etype
(T
, Base
);
1554 Set_Size_Info
(T
, Int_Base
);
1555 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1556 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1557 Set_Digits_Value
(T
, Digs_Val
);
1558 Set_Delta_Value
(T
, Delta_Val
);
1559 Set_Small_Value
(T
, Delta_Val
);
1560 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1561 Set_Is_Constrained
(T
);
1563 Check_Restriction
(No_Fixed_Point
, Def
);
1564 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1566 -------------------------------------------
1567 -- Analyze_Formal_Derived_Interface_Type --
1568 -------------------------------------------
1570 procedure Analyze_Formal_Derived_Interface_Type
1575 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1578 -- Rewrite as a type declaration of a derived type. This ensures that
1579 -- the interface list and primitive operations are properly captured.
1582 Make_Full_Type_Declaration
(Loc
,
1583 Defining_Identifier
=> T
,
1584 Type_Definition
=> Def
));
1586 Set_Is_Generic_Type
(T
);
1587 end Analyze_Formal_Derived_Interface_Type
;
1589 ---------------------------------
1590 -- Analyze_Formal_Derived_Type --
1591 ---------------------------------
1593 procedure Analyze_Formal_Derived_Type
1598 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1599 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1603 Set_Is_Generic_Type
(T
);
1605 if Private_Present
(Def
) then
1607 Make_Private_Extension_Declaration
(Loc
,
1608 Defining_Identifier
=> T
,
1609 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1610 Unknown_Discriminants_Present
=> Unk_Disc
,
1611 Subtype_Indication
=> Subtype_Mark
(Def
),
1612 Interface_List
=> Interface_List
(Def
));
1614 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1615 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
1616 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
1620 Make_Full_Type_Declaration
(Loc
,
1621 Defining_Identifier
=> T
,
1622 Discriminant_Specifications
=>
1623 Discriminant_Specifications
(Parent
(T
)),
1625 Make_Derived_Type_Definition
(Loc
,
1626 Subtype_Indication
=> Subtype_Mark
(Def
)));
1628 Set_Abstract_Present
1629 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1631 (Type_Definition
(New_N
), Limited_Present
(Def
));
1638 if not Is_Composite_Type
(T
) then
1640 ("unknown discriminants not allowed for elementary types", N
);
1642 Set_Has_Unknown_Discriminants
(T
);
1643 Set_Is_Constrained
(T
, False);
1647 -- If the parent type has a known size, so does the formal, which makes
1648 -- legal representation clauses that involve the formal.
1650 Set_Size_Known_At_Compile_Time
1651 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1652 end Analyze_Formal_Derived_Type
;
1654 ----------------------------------
1655 -- Analyze_Formal_Discrete_Type --
1656 ----------------------------------
1658 -- The operations defined for a discrete types are those of an enumeration
1659 -- type. The size is set to an arbitrary value, for use in analyzing the
1662 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1663 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1667 Base
: constant Entity_Id
:=
1669 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1672 Set_Ekind
(T
, E_Enumeration_Subtype
);
1673 Set_Etype
(T
, Base
);
1676 Set_Is_Generic_Type
(T
);
1677 Set_Is_Constrained
(T
);
1679 -- For semantic analysis, the bounds of the type must be set to some
1680 -- non-static value. The simplest is to create attribute nodes for those
1681 -- bounds, that refer to the type itself. These bounds are never
1682 -- analyzed but serve as place-holders.
1685 Make_Attribute_Reference
(Loc
,
1686 Attribute_Name
=> Name_First
,
1687 Prefix
=> New_Reference_To
(T
, Loc
));
1691 Make_Attribute_Reference
(Loc
,
1692 Attribute_Name
=> Name_Last
,
1693 Prefix
=> New_Reference_To
(T
, Loc
));
1696 Set_Scalar_Range
(T
,
1701 Set_Ekind
(Base
, E_Enumeration_Type
);
1702 Set_Etype
(Base
, Base
);
1703 Init_Size
(Base
, 8);
1704 Init_Alignment
(Base
);
1705 Set_Is_Generic_Type
(Base
);
1706 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1707 Set_Parent
(Base
, Parent
(Def
));
1708 end Analyze_Formal_Discrete_Type
;
1710 ----------------------------------
1711 -- Analyze_Formal_Floating_Type --
1712 ---------------------------------
1714 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1715 Base
: constant Entity_Id
:=
1717 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1720 -- The various semantic attributes are taken from the predefined type
1721 -- Float, just so that all of them are initialized. Their values are
1722 -- never used because no constant folding or expansion takes place in
1723 -- the generic itself.
1726 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1727 Set_Etype
(T
, Base
);
1728 Set_Size_Info
(T
, (Standard_Float
));
1729 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1730 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1731 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1732 Set_Is_Constrained
(T
);
1734 Set_Is_Generic_Type
(Base
);
1735 Set_Etype
(Base
, Base
);
1736 Set_Size_Info
(Base
, (Standard_Float
));
1737 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1738 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1739 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1740 Set_Parent
(Base
, Parent
(Def
));
1742 Check_Restriction
(No_Floating_Point
, Def
);
1743 end Analyze_Formal_Floating_Type
;
1745 -----------------------------------
1746 -- Analyze_Formal_Interface_Type;--
1747 -----------------------------------
1749 procedure Analyze_Formal_Interface_Type
1754 Loc
: constant Source_Ptr
:= Sloc
(N
);
1759 Make_Full_Type_Declaration
(Loc
,
1760 Defining_Identifier
=> T
,
1761 Type_Definition
=> Def
);
1765 Set_Is_Generic_Type
(T
);
1766 end Analyze_Formal_Interface_Type
;
1768 ---------------------------------
1769 -- Analyze_Formal_Modular_Type --
1770 ---------------------------------
1772 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1774 -- Apart from their entity kind, generic modular types are treated like
1775 -- signed integer types, and have the same attributes.
1777 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1778 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1779 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1781 end Analyze_Formal_Modular_Type
;
1783 ---------------------------------------
1784 -- Analyze_Formal_Object_Declaration --
1785 ---------------------------------------
1787 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1788 E
: constant Node_Id
:= Default_Expression
(N
);
1789 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1796 -- Determine the mode of the formal object
1798 if Out_Present
(N
) then
1799 K
:= E_Generic_In_Out_Parameter
;
1801 if not In_Present
(N
) then
1802 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1806 K
:= E_Generic_In_Parameter
;
1809 if Present
(Subtype_Mark
(N
)) then
1810 Find_Type
(Subtype_Mark
(N
));
1811 T
:= Entity
(Subtype_Mark
(N
));
1813 -- Ada 2005 (AI-423): Formal object with an access definition
1816 Check_Access_Definition
(N
);
1817 T
:= Access_Definition
1819 N
=> Access_Definition
(N
));
1822 if Ekind
(T
) = E_Incomplete_Type
then
1824 Error_Node
: Node_Id
;
1827 if Present
(Subtype_Mark
(N
)) then
1828 Error_Node
:= Subtype_Mark
(N
);
1830 Check_Access_Definition
(N
);
1831 Error_Node
:= Access_Definition
(N
);
1834 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
1838 if K
= E_Generic_In_Parameter
then
1840 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1842 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1844 ("generic formal of mode IN must not be of limited type", N
);
1845 Explain_Limited_Type
(T
, N
);
1848 if Is_Abstract_Type
(T
) then
1850 ("generic formal of mode IN must not be of abstract type", N
);
1854 Preanalyze_Spec_Expression
(E
, T
);
1856 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(E
) then
1858 ("initialization not allowed for limited types", E
);
1859 Explain_Limited_Type
(T
, E
);
1866 -- Case of generic IN OUT parameter
1869 -- If the formal has an unconstrained type, construct its actual
1870 -- subtype, as is done for subprogram formals. In this fashion, all
1871 -- its uses can refer to specific bounds.
1876 if (Is_Array_Type
(T
)
1877 and then not Is_Constrained
(T
))
1879 (Ekind
(T
) = E_Record_Type
1880 and then Has_Discriminants
(T
))
1883 Non_Freezing_Ref
: constant Node_Id
:=
1884 New_Reference_To
(Id
, Sloc
(Id
));
1888 -- Make sure the actual subtype doesn't generate bogus freezing
1890 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1891 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1892 Insert_Before_And_Analyze
(N
, Decl
);
1893 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1896 Set_Actual_Subtype
(Id
, T
);
1901 ("initialization not allowed for `IN OUT` formals", N
);
1905 end Analyze_Formal_Object_Declaration
;
1907 ----------------------------------------------
1908 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1909 ----------------------------------------------
1911 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1915 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1916 Base
: constant Entity_Id
:=
1918 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1920 -- The semantic attributes are set for completeness only, their values
1921 -- will never be used, since all properties of the type are non-static.
1924 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1925 Set_Etype
(T
, Base
);
1926 Set_Size_Info
(T
, Standard_Integer
);
1927 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1928 Set_Small_Value
(T
, Ureal_1
);
1929 Set_Delta_Value
(T
, Ureal_1
);
1930 Set_Scalar_Range
(T
,
1932 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1933 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1934 Set_Is_Constrained
(T
);
1936 Set_Is_Generic_Type
(Base
);
1937 Set_Etype
(Base
, Base
);
1938 Set_Size_Info
(Base
, Standard_Integer
);
1939 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1940 Set_Small_Value
(Base
, Ureal_1
);
1941 Set_Delta_Value
(Base
, Ureal_1
);
1942 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1943 Set_Parent
(Base
, Parent
(Def
));
1945 Check_Restriction
(No_Fixed_Point
, Def
);
1946 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1948 ----------------------------
1949 -- Analyze_Formal_Package --
1950 ----------------------------
1952 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1953 Loc
: constant Source_Ptr
:= Sloc
(N
);
1954 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1956 Gen_Id
: constant Node_Id
:= Name
(N
);
1958 Gen_Unit
: Entity_Id
;
1960 Parent_Installed
: Boolean := False;
1962 Parent_Instance
: Entity_Id
;
1963 Renaming_In_Par
: Entity_Id
;
1964 No_Associations
: Boolean := False;
1966 function Build_Local_Package
return Node_Id
;
1967 -- The formal package is rewritten so that its parameters are replaced
1968 -- with corresponding declarations. For parameters with bona fide
1969 -- associations these declarations are created by Analyze_Associations
1970 -- as for a regular instantiation. For boxed parameters, we preserve
1971 -- the formal declarations and analyze them, in order to introduce
1972 -- entities of the right kind in the environment of the formal.
1974 -------------------------
1975 -- Build_Local_Package --
1976 -------------------------
1978 function Build_Local_Package
return Node_Id
is
1980 Pack_Decl
: Node_Id
;
1983 -- Within the formal, the name of the generic package is a renaming
1984 -- of the formal (as for a regular instantiation).
1987 Make_Package_Declaration
(Loc
,
1990 (Specification
(Original_Node
(Gen_Decl
)),
1991 Empty
, Instantiating
=> True));
1993 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1994 Defining_Unit_Name
=>
1995 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1996 Name
=> New_Occurrence_Of
(Formal
, Loc
));
1998 if Nkind
(Gen_Id
) = N_Identifier
1999 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2002 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2005 -- If the formal is declared with a box, or with an others choice,
2006 -- create corresponding declarations for all entities in the formal
2007 -- part, so that names with the proper types are available in the
2008 -- specification of the formal package.
2009 -- On the other hand, if there are no associations, then all the
2010 -- formals must have defaults, and this will be checked by the
2011 -- call to Analyze_Associations.
2014 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2017 Formal_Decl
: Node_Id
;
2020 -- TBA : for a formal package, need to recurse ???
2025 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2026 while Present
(Formal_Decl
) loop
2028 (Decls
, Copy_Generic_Node
(Formal_Decl
, Empty
, True));
2033 -- If generic associations are present, use Analyze_Associations to
2034 -- create the proper renaming declarations.
2038 Act_Tree
: constant Node_Id
:=
2040 (Original_Node
(Gen_Decl
), Empty
,
2041 Instantiating
=> True);
2044 Generic_Renamings
.Set_Last
(0);
2045 Generic_Renamings_HTable
.Reset
;
2046 Instantiation_Node
:= N
;
2049 Analyze_Associations
2051 Generic_Formal_Declarations
(Act_Tree
),
2052 Generic_Formal_Declarations
(Gen_Decl
));
2056 Append
(Renaming
, To
=> Decls
);
2058 -- Add generated declarations ahead of local declarations in
2061 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2062 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2065 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2070 end Build_Local_Package
;
2072 -- Start of processing for Analyze_Formal_Package
2075 Text_IO_Kludge
(Gen_Id
);
2078 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2079 Gen_Unit
:= Entity
(Gen_Id
);
2081 -- Check for a formal package that is a package renaming
2083 if Present
(Renamed_Object
(Gen_Unit
)) then
2084 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2087 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2088 Error_Msg_N
("expect generic package name", Gen_Id
);
2092 elsif Gen_Unit
= Current_Scope
then
2094 ("generic package cannot be used as a formal package of itself",
2099 elsif In_Open_Scopes
(Gen_Unit
) then
2100 if Is_Compilation_Unit
(Gen_Unit
)
2101 and then Is_Child_Unit
(Current_Scope
)
2103 -- Special-case the error when the formal is a parent, and
2104 -- continue analysis to minimize cascaded errors.
2107 ("generic parent cannot be used as formal package "
2108 & "of a child unit",
2113 ("generic package cannot be used as a formal package "
2122 or else No
(Generic_Associations
(N
))
2123 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2125 No_Associations
:= True;
2128 -- If there are no generic associations, the generic parameters appear
2129 -- as local entities and are instantiated like them. We copy the generic
2130 -- package declaration as if it were an instantiation, and analyze it
2131 -- like a regular package, except that we treat the formals as
2132 -- additional visible components.
2134 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2136 if In_Extended_Main_Source_Unit
(N
) then
2137 Set_Is_Instantiated
(Gen_Unit
);
2138 Generate_Reference
(Gen_Unit
, N
);
2141 Formal
:= New_Copy
(Pack_Id
);
2142 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2145 -- Make local generic without formals. The formals will be replaced
2146 -- with internal declarations.
2148 New_N
:= Build_Local_Package
;
2150 -- If there are errors in the parameter list, Analyze_Associations
2151 -- raises Instantiation_Error. Patch the declaration to prevent
2152 -- further exception propagation.
2155 when Instantiation_Error
=>
2157 Enter_Name
(Formal
);
2158 Set_Ekind
(Formal
, E_Variable
);
2159 Set_Etype
(Formal
, Any_Type
);
2161 if Parent_Installed
then
2169 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2170 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2171 Set_Instance_Env
(Gen_Unit
, Formal
);
2172 Set_Is_Generic_Instance
(Formal
);
2174 Enter_Name
(Formal
);
2175 Set_Ekind
(Formal
, E_Package
);
2176 Set_Etype
(Formal
, Standard_Void_Type
);
2177 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2178 Push_Scope
(Formal
);
2180 if Is_Child_Unit
(Gen_Unit
)
2181 and then Parent_Installed
2183 -- Similarly, we have to make the name of the formal visible in the
2184 -- parent instance, to resolve properly fully qualified names that
2185 -- may appear in the generic unit. The parent instance has been
2186 -- placed on the scope stack ahead of the current scope.
2188 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2191 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2192 Set_Ekind
(Renaming_In_Par
, E_Package
);
2193 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2194 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2195 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2196 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2197 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2200 Analyze
(Specification
(N
));
2202 -- The formals for which associations are provided are not visible
2203 -- outside of the formal package. The others are still declared by a
2204 -- formal parameter declaration.
2206 if not No_Associations
then
2211 E
:= First_Entity
(Formal
);
2212 while Present
(E
) loop
2213 exit when Ekind
(E
) = E_Package
2214 and then Renamed_Entity
(E
) = Formal
;
2216 if not Is_Generic_Formal
(E
) then
2225 End_Package_Scope
(Formal
);
2227 if Parent_Installed
then
2233 -- Inside the generic unit, the formal package is a regular package, but
2234 -- no body is needed for it. Note that after instantiation, the defining
2235 -- unit name we need is in the new tree and not in the original (see
2236 -- Package_Instantiation). A generic formal package is an instance, and
2237 -- can be used as an actual for an inner instance.
2239 Set_Has_Completion
(Formal
, True);
2241 -- Add semantic information to the original defining identifier.
2244 Set_Ekind
(Pack_Id
, E_Package
);
2245 Set_Etype
(Pack_Id
, Standard_Void_Type
);
2246 Set_Scope
(Pack_Id
, Scope
(Formal
));
2247 Set_Has_Completion
(Pack_Id
, True);
2248 end Analyze_Formal_Package
;
2250 ---------------------------------
2251 -- Analyze_Formal_Private_Type --
2252 ---------------------------------
2254 procedure Analyze_Formal_Private_Type
2260 New_Private_Type
(N
, T
, Def
);
2262 -- Set the size to an arbitrary but legal value
2264 Set_Size_Info
(T
, Standard_Integer
);
2265 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2266 end Analyze_Formal_Private_Type
;
2268 ----------------------------------------
2269 -- Analyze_Formal_Signed_Integer_Type --
2270 ----------------------------------------
2272 procedure Analyze_Formal_Signed_Integer_Type
2276 Base
: constant Entity_Id
:=
2278 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
2283 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
2284 Set_Etype
(T
, Base
);
2285 Set_Size_Info
(T
, Standard_Integer
);
2286 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2287 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
2288 Set_Is_Constrained
(T
);
2290 Set_Is_Generic_Type
(Base
);
2291 Set_Size_Info
(Base
, Standard_Integer
);
2292 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2293 Set_Etype
(Base
, Base
);
2294 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
2295 Set_Parent
(Base
, Parent
(Def
));
2296 end Analyze_Formal_Signed_Integer_Type
;
2298 -------------------------------
2299 -- Analyze_Formal_Subprogram --
2300 -------------------------------
2302 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
2303 Spec
: constant Node_Id
:= Specification
(N
);
2304 Def
: constant Node_Id
:= Default_Name
(N
);
2305 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2313 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
2314 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
2318 Analyze_Subprogram_Declaration
(N
);
2319 Set_Is_Formal_Subprogram
(Nam
);
2320 Set_Has_Completion
(Nam
);
2322 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
2323 Set_Is_Abstract_Subprogram
(Nam
);
2324 Set_Is_Dispatching_Operation
(Nam
);
2327 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
2329 if No
(Ctrl_Type
) then
2331 ("abstract formal subprogram must have a controlling type",
2334 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
2339 -- Default name is resolved at the point of instantiation
2341 if Box_Present
(N
) then
2344 -- Else default is bound at the point of generic declaration
2346 elsif Present
(Def
) then
2347 if Nkind
(Def
) = N_Operator_Symbol
then
2348 Find_Direct_Name
(Def
);
2350 elsif Nkind
(Def
) /= N_Attribute_Reference
then
2354 -- For an attribute reference, analyze the prefix and verify
2355 -- that it has the proper profile for the subprogram.
2357 Analyze
(Prefix
(Def
));
2358 Valid_Default_Attribute
(Nam
, Def
);
2362 -- Default name may be overloaded, in which case the interpretation
2363 -- with the correct profile must be selected, as for a renaming.
2364 -- If the definition is an indexed component, it must denote a
2365 -- member of an entry family. If it is a selected component, it
2366 -- can be a protected operation.
2368 if Etype
(Def
) = Any_Type
then
2371 elsif Nkind
(Def
) = N_Selected_Component
then
2372 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
2373 Error_Msg_N
("expect valid subprogram name as default", Def
);
2376 elsif Nkind
(Def
) = N_Indexed_Component
then
2377 if Is_Entity_Name
(Prefix
(Def
)) then
2378 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
2379 Error_Msg_N
("expect valid subprogram name as default", Def
);
2382 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
2383 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
))))
2386 Error_Msg_N
("expect valid subprogram name as default", Def
);
2390 Error_Msg_N
("expect valid subprogram name as default", Def
);
2394 elsif Nkind
(Def
) = N_Character_Literal
then
2396 -- Needs some type checks: subprogram should be parameterless???
2398 Resolve
(Def
, (Etype
(Nam
)));
2400 elsif not Is_Entity_Name
(Def
)
2401 or else not Is_Overloadable
(Entity
(Def
))
2403 Error_Msg_N
("expect valid subprogram name as default", Def
);
2406 elsif not Is_Overloaded
(Def
) then
2407 Subp
:= Entity
(Def
);
2410 Error_Msg_N
("premature usage of formal subprogram", Def
);
2412 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
2413 Error_Msg_N
("no visible entity matches specification", Def
);
2418 -- Several interpretations. Disambiguate as for a renaming.
2422 I1
: Interp_Index
:= 0;
2428 Get_First_Interp
(Def
, I
, It
);
2429 while Present
(It
.Nam
) loop
2431 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
2432 if Subp
/= Any_Id
then
2433 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
2435 if It1
= No_Interp
then
2436 Error_Msg_N
("ambiguous default subprogram", Def
);
2449 Get_Next_Interp
(I
, It
);
2453 if Subp
/= Any_Id
then
2454 Set_Entity
(Def
, Subp
);
2457 Error_Msg_N
("premature usage of formal subprogram", Def
);
2459 elsif Ekind
(Subp
) /= E_Operator
then
2460 Check_Mode_Conformant
(Subp
, Nam
);
2464 Error_Msg_N
("no visible subprogram matches specification", N
);
2468 end Analyze_Formal_Subprogram
;
2470 -------------------------------------
2471 -- Analyze_Formal_Type_Declaration --
2472 -------------------------------------
2474 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
2475 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
2479 T
:= Defining_Identifier
(N
);
2481 if Present
(Discriminant_Specifications
(N
))
2482 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2485 ("discriminants not allowed for this formal type", T
);
2488 -- Enter the new name, and branch to specific routine
2491 when N_Formal_Private_Type_Definition
=>
2492 Analyze_Formal_Private_Type
(N
, T
, Def
);
2494 when N_Formal_Derived_Type_Definition
=>
2495 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2497 when N_Formal_Discrete_Type_Definition
=>
2498 Analyze_Formal_Discrete_Type
(T
, Def
);
2500 when N_Formal_Signed_Integer_Type_Definition
=>
2501 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2503 when N_Formal_Modular_Type_Definition
=>
2504 Analyze_Formal_Modular_Type
(T
, Def
);
2506 when N_Formal_Floating_Point_Definition
=>
2507 Analyze_Formal_Floating_Type
(T
, Def
);
2509 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2510 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2512 when N_Formal_Decimal_Fixed_Point_Definition
=>
2513 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2515 when N_Array_Type_Definition
=>
2516 Analyze_Formal_Array_Type
(T
, Def
);
2518 when N_Access_To_Object_Definition |
2519 N_Access_Function_Definition |
2520 N_Access_Procedure_Definition
=>
2521 Analyze_Generic_Access_Type
(T
, Def
);
2523 -- Ada 2005: a interface declaration is encoded as an abstract
2524 -- record declaration or a abstract type derivation.
2526 when N_Record_Definition
=>
2527 Analyze_Formal_Interface_Type
(N
, T
, Def
);
2529 when N_Derived_Type_Definition
=>
2530 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
2536 raise Program_Error
;
2540 Set_Is_Generic_Type
(T
);
2541 end Analyze_Formal_Type_Declaration
;
2543 ------------------------------------
2544 -- Analyze_Function_Instantiation --
2545 ------------------------------------
2547 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2549 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2550 end Analyze_Function_Instantiation
;
2552 ---------------------------------
2553 -- Analyze_Generic_Access_Type --
2554 ---------------------------------
2556 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2560 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2561 Access_Type_Declaration
(T
, Def
);
2563 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2564 and then No
(Full_View
(Designated_Type
(T
)))
2565 and then not Is_Generic_Type
(Designated_Type
(T
))
2567 Error_Msg_N
("premature usage of incomplete type", Def
);
2569 elsif Is_Internal
(Designated_Type
(T
)) then
2571 ("only a subtype mark is allowed in a formal", Def
);
2575 Access_Subprogram_Declaration
(T
, Def
);
2577 end Analyze_Generic_Access_Type
;
2579 ---------------------------------
2580 -- Analyze_Generic_Formal_Part --
2581 ---------------------------------
2583 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2584 Gen_Parm_Decl
: Node_Id
;
2587 -- The generic formals are processed in the scope of the generic unit,
2588 -- where they are immediately visible. The scope is installed by the
2591 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2593 while Present
(Gen_Parm_Decl
) loop
2594 Analyze
(Gen_Parm_Decl
);
2595 Next
(Gen_Parm_Decl
);
2598 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2599 end Analyze_Generic_Formal_Part
;
2601 ------------------------------------------
2602 -- Analyze_Generic_Package_Declaration --
2603 ------------------------------------------
2605 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2606 Loc
: constant Source_Ptr
:= Sloc
(N
);
2609 Save_Parent
: Node_Id
;
2611 Decls
: constant List_Id
:=
2612 Visible_Declarations
(Specification
(N
));
2616 -- We introduce a renaming of the enclosing package, to have a usable
2617 -- entity as the prefix of an expanded name for a local entity of the
2618 -- form Par.P.Q, where P is the generic package. This is because a local
2619 -- entity named P may hide it, so that the usual visibility rules in
2620 -- the instance will not resolve properly.
2623 Make_Package_Renaming_Declaration
(Loc
,
2624 Defining_Unit_Name
=>
2625 Make_Defining_Identifier
(Loc
,
2626 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2627 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2629 if Present
(Decls
) then
2630 Decl
:= First
(Decls
);
2631 while Present
(Decl
)
2632 and then Nkind
(Decl
) = N_Pragma
2637 if Present
(Decl
) then
2638 Insert_Before
(Decl
, Renaming
);
2640 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2644 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2647 -- Create copy of generic unit, and save for instantiation. If the unit
2648 -- is a child unit, do not copy the specifications for the parent, which
2649 -- are not part of the generic tree.
2651 Save_Parent
:= Parent_Spec
(N
);
2652 Set_Parent_Spec
(N
, Empty
);
2654 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2655 Set_Parent_Spec
(New_N
, Save_Parent
);
2657 Id
:= Defining_Entity
(N
);
2658 Generate_Definition
(Id
);
2660 -- Expansion is not applied to generic units
2665 Set_Ekind
(Id
, E_Generic_Package
);
2666 Set_Etype
(Id
, Standard_Void_Type
);
2668 Enter_Generic_Scope
(Id
);
2669 Set_Inner_Instances
(Id
, New_Elmt_List
);
2671 Set_Categorization_From_Pragmas
(N
);
2672 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2674 -- Link the declaration of the generic homonym in the generic copy to
2675 -- the package it renames, so that it is always resolved properly.
2677 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2678 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2680 -- For a library unit, we have reconstructed the entity for the unit,
2681 -- and must reset it in the library tables.
2683 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2684 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2687 Analyze_Generic_Formal_Part
(N
);
2689 -- After processing the generic formals, analysis proceeds as for a
2690 -- non-generic package.
2692 Analyze
(Specification
(N
));
2694 Validate_Categorization_Dependency
(N
, Id
);
2698 End_Package_Scope
(Id
);
2699 Exit_Generic_Scope
(Id
);
2701 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2702 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2703 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2704 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2707 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2708 Validate_RT_RAT_Component
(N
);
2710 -- If this is a spec without a body, check that generic parameters
2713 if not Body_Required
(Parent
(N
)) then
2714 Check_References
(Id
);
2717 end Analyze_Generic_Package_Declaration
;
2719 --------------------------------------------
2720 -- Analyze_Generic_Subprogram_Declaration --
2721 --------------------------------------------
2723 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2728 Result_Type
: Entity_Id
;
2729 Save_Parent
: Node_Id
;
2732 -- Create copy of generic unit, and save for instantiation. If the unit
2733 -- is a child unit, do not copy the specifications for the parent, which
2734 -- are not part of the generic tree.
2736 Save_Parent
:= Parent_Spec
(N
);
2737 Set_Parent_Spec
(N
, Empty
);
2739 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2740 Set_Parent_Spec
(New_N
, Save_Parent
);
2743 Spec
:= Specification
(N
);
2744 Id
:= Defining_Entity
(Spec
);
2745 Generate_Definition
(Id
);
2747 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2749 ("operator symbol not allowed for generic subprogram", Id
);
2756 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2758 Enter_Generic_Scope
(Id
);
2759 Set_Inner_Instances
(Id
, New_Elmt_List
);
2760 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2762 Analyze_Generic_Formal_Part
(N
);
2764 Formals
:= Parameter_Specifications
(Spec
);
2766 if Present
(Formals
) then
2767 Process_Formals
(Formals
, Spec
);
2770 if Nkind
(Spec
) = N_Function_Specification
then
2771 Set_Ekind
(Id
, E_Generic_Function
);
2773 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
2774 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
2775 Set_Etype
(Id
, Result_Type
);
2777 Find_Type
(Result_Definition
(Spec
));
2778 Set_Etype
(Id
, Entity
(Result_Definition
(Spec
)));
2782 Set_Ekind
(Id
, E_Generic_Procedure
);
2783 Set_Etype
(Id
, Standard_Void_Type
);
2786 -- For a library unit, we have reconstructed the entity for the unit,
2787 -- and must reset it in the library tables. We also make sure that
2788 -- Body_Required is set properly in the original compilation unit node.
2790 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2791 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2792 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2795 Set_Categorization_From_Pragmas
(N
);
2796 Validate_Categorization_Dependency
(N
, Id
);
2798 Save_Global_References
(Original_Node
(N
));
2802 Exit_Generic_Scope
(Id
);
2803 Generate_Reference_To_Formals
(Id
);
2804 end Analyze_Generic_Subprogram_Declaration
;
2806 -----------------------------------
2807 -- Analyze_Package_Instantiation --
2808 -----------------------------------
2810 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2811 Loc
: constant Source_Ptr
:= Sloc
(N
);
2812 Gen_Id
: constant Node_Id
:= Name
(N
);
2815 Act_Decl_Name
: Node_Id
;
2816 Act_Decl_Id
: Entity_Id
;
2821 Gen_Unit
: Entity_Id
;
2823 Is_Actual_Pack
: constant Boolean :=
2824 Is_Internal
(Defining_Entity
(N
));
2826 Env_Installed
: Boolean := False;
2827 Parent_Installed
: Boolean := False;
2828 Renaming_List
: List_Id
;
2829 Unit_Renaming
: Node_Id
;
2830 Needs_Body
: Boolean;
2831 Inline_Now
: Boolean := False;
2833 procedure Delay_Descriptors
(E
: Entity_Id
);
2834 -- Delay generation of subprogram descriptors for given entity
2836 function Might_Inline_Subp
return Boolean;
2837 -- If inlining is active and the generic contains inlined subprograms,
2838 -- we instantiate the body. This may cause superfluous instantiations,
2839 -- but it is simpler than detecting the need for the body at the point
2840 -- of inlining, when the context of the instance is not available.
2842 -----------------------
2843 -- Delay_Descriptors --
2844 -----------------------
2846 procedure Delay_Descriptors
(E
: Entity_Id
) is
2848 if not Delay_Subprogram_Descriptors
(E
) then
2849 Set_Delay_Subprogram_Descriptors
(E
);
2850 Pending_Descriptor
.Append
(E
);
2852 end Delay_Descriptors
;
2854 -----------------------
2855 -- Might_Inline_Subp --
2856 -----------------------
2858 function Might_Inline_Subp
return Boolean is
2862 if not Inline_Processing_Required
then
2866 E
:= First_Entity
(Gen_Unit
);
2867 while Present
(E
) loop
2868 if Is_Subprogram
(E
)
2869 and then Is_Inlined
(E
)
2879 end Might_Inline_Subp
;
2881 -- Start of processing for Analyze_Package_Instantiation
2884 -- Very first thing: apply the special kludge for Text_IO processing
2885 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2887 Text_IO_Kludge
(Name
(N
));
2889 -- Make node global for error reporting
2891 Instantiation_Node
:= N
;
2893 -- Case of instantiation of a generic package
2895 if Nkind
(N
) = N_Package_Instantiation
then
2896 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2897 Set_Comes_From_Source
(Act_Decl_Id
, True);
2899 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2901 Make_Defining_Program_Unit_Name
(Loc
,
2902 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2903 Defining_Identifier
=> Act_Decl_Id
);
2905 Act_Decl_Name
:= Act_Decl_Id
;
2908 -- Case of instantiation of a formal package
2911 Act_Decl_Id
:= Defining_Identifier
(N
);
2912 Act_Decl_Name
:= Act_Decl_Id
;
2915 Generate_Definition
(Act_Decl_Id
);
2916 Preanalyze_Actuals
(N
);
2919 Env_Installed
:= True;
2920 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2921 Gen_Unit
:= Entity
(Gen_Id
);
2923 -- Verify that it is the name of a generic package
2925 if Etype
(Gen_Unit
) = Any_Type
then
2929 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2931 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2933 if From_With_Type
(Gen_Unit
) then
2935 ("cannot instantiate a limited withed package", Gen_Id
);
2938 ("expect name of generic package in instantiation", Gen_Id
);
2945 if In_Extended_Main_Source_Unit
(N
) then
2946 Set_Is_Instantiated
(Gen_Unit
);
2947 Generate_Reference
(Gen_Unit
, N
);
2949 if Present
(Renamed_Object
(Gen_Unit
)) then
2950 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2951 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2955 if Nkind
(Gen_Id
) = N_Identifier
2956 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2959 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2961 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2962 and then Is_Child_Unit
(Gen_Unit
)
2963 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2964 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2967 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2970 Set_Entity
(Gen_Id
, Gen_Unit
);
2972 -- If generic is a renaming, get original generic unit
2974 if Present
(Renamed_Object
(Gen_Unit
))
2975 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2977 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2980 -- Verify that there are no circular instantiations
2982 if In_Open_Scopes
(Gen_Unit
) then
2983 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2987 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2988 Error_Msg_Node_2
:= Current_Scope
;
2990 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2991 Circularity_Detected
:= True;
2996 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2998 -- Initialize renamings map, for error checking, and the list that
2999 -- holds private entities whose views have changed between generic
3000 -- definition and instantiation. If this is the instance created to
3001 -- validate an actual package, the instantiation environment is that
3002 -- of the enclosing instance.
3004 Generic_Renamings
.Set_Last
(0);
3005 Generic_Renamings_HTable
.Reset
;
3007 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3009 -- Copy original generic tree, to produce text for instantiation
3013 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3015 Act_Spec
:= Specification
(Act_Tree
);
3017 -- If this is the instance created to validate an actual package,
3018 -- only the formals matter, do not examine the package spec itself.
3020 if Is_Actual_Pack
then
3021 Set_Visible_Declarations
(Act_Spec
, New_List
);
3022 Set_Private_Declarations
(Act_Spec
, New_List
);
3026 Analyze_Associations
3028 Generic_Formal_Declarations
(Act_Tree
),
3029 Generic_Formal_Declarations
(Gen_Decl
));
3031 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3032 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3033 Set_Is_Generic_Instance
(Act_Decl_Id
);
3035 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3037 -- References to the generic in its own declaration or its body are
3038 -- references to the instance. Add a renaming declaration for the
3039 -- generic unit itself. This declaration, as well as the renaming
3040 -- declarations for the generic formals, must remain private to the
3041 -- unit: the formals, because this is the language semantics, and
3042 -- the unit because its use is an artifact of the implementation.
3045 Make_Package_Renaming_Declaration
(Loc
,
3046 Defining_Unit_Name
=>
3047 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3048 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
3050 Append
(Unit_Renaming
, Renaming_List
);
3052 -- The renaming declarations are the first local declarations of
3055 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3057 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3059 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3063 Make_Package_Declaration
(Loc
,
3064 Specification
=> Act_Spec
);
3066 -- Save the instantiation node, for subsequent instantiation of the
3067 -- body, if there is one and we are generating code for the current
3068 -- unit. Mark the unit as having a body, to avoid a premature error
3071 -- We instantiate the body if we are generating code, if we are
3072 -- generating cross-reference information, or if we are building
3073 -- trees for ASIS use.
3076 Enclosing_Body_Present
: Boolean := False;
3077 -- If the generic unit is not a compilation unit, then a body may
3078 -- be present in its parent even if none is required. We create a
3079 -- tentative pending instantiation for the body, which will be
3080 -- discarded if none is actually present.
3085 if Scope
(Gen_Unit
) /= Standard_Standard
3086 and then not Is_Child_Unit
(Gen_Unit
)
3088 Scop
:= Scope
(Gen_Unit
);
3090 while Present
(Scop
)
3091 and then Scop
/= Standard_Standard
3093 if Unit_Requires_Body
(Scop
) then
3094 Enclosing_Body_Present
:= True;
3097 elsif In_Open_Scopes
(Scop
)
3098 and then In_Package_Body
(Scop
)
3100 Enclosing_Body_Present
:= True;
3104 exit when Is_Compilation_Unit
(Scop
);
3105 Scop
:= Scope
(Scop
);
3109 -- If front-end inlining is enabled, and this is a unit for which
3110 -- code will be generated, we instantiate the body at once.
3112 -- This is done if the instance is not the main unit, and if the
3113 -- generic is not a child unit of another generic, to avoid scope
3114 -- problems and the reinstallation of parent instances.
3117 and then (not Is_Child_Unit
(Gen_Unit
)
3118 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
3119 and then Might_Inline_Subp
3120 and then not Is_Actual_Pack
3122 if Front_End_Inlining
3123 and then (Is_In_Main_Unit
(N
)
3124 or else In_Main_Context
(Current_Scope
))
3125 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3129 -- In configurable_run_time mode we force the inlining of
3130 -- predefined subprograms marked Inline_Always, to minimize
3131 -- the use of the run-time library.
3133 elsif Is_Predefined_File_Name
3134 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
3135 and then Configurable_Run_Time_Mode
3136 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3141 -- If the current scope is itself an instance within a child
3142 -- unit, there will be duplications in the scope stack, and the
3143 -- unstacking mechanism in Inline_Instance_Body will fail.
3144 -- This loses some rare cases of optimization, and might be
3145 -- improved some day, if we can find a proper abstraction for
3146 -- "the complete compilation context" that can be saved and
3149 if Is_Generic_Instance
(Current_Scope
) then
3151 Curr_Unit
: constant Entity_Id
:=
3152 Cunit_Entity
(Current_Sem_Unit
);
3154 if Curr_Unit
/= Current_Scope
3155 and then Is_Child_Unit
(Curr_Unit
)
3157 Inline_Now
:= False;
3164 (Unit_Requires_Body
(Gen_Unit
)
3165 or else Enclosing_Body_Present
3166 or else Present
(Corresponding_Body
(Gen_Decl
)))
3167 and then (Is_In_Main_Unit
(N
)
3168 or else Might_Inline_Subp
)
3169 and then not Is_Actual_Pack
3170 and then not Inline_Now
3171 and then (Operating_Mode
= Generate_Code
3172 or else (Operating_Mode
= Check_Semantics
3173 and then ASIS_Mode
));
3175 -- If front_end_inlining is enabled, do not instantiate body if
3176 -- within a generic context.
3178 if (Front_End_Inlining
3179 and then not Expander_Active
)
3180 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
3182 Needs_Body
:= False;
3185 -- If the current context is generic, and the package being
3186 -- instantiated is declared within a formal package, there is no
3187 -- body to instantiate until the enclosing generic is instantiated
3188 -- and there is an actual for the formal package. If the formal
3189 -- package has parameters, we build a regular package instance for
3190 -- it, that precedes the original formal package declaration.
3192 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
3194 Decl
: constant Node_Id
:=
3196 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
3198 if Nkind
(Decl
) = N_Formal_Package_Declaration
3199 or else (Nkind
(Decl
) = N_Package_Declaration
3200 and then Is_List_Member
(Decl
)
3201 and then Present
(Next
(Decl
))
3203 Nkind
(Next
(Decl
)) =
3204 N_Formal_Package_Declaration
)
3206 Needs_Body
:= False;
3212 -- If we are generating the calling stubs from the instantiation of
3213 -- a generic RCI package, we will not use the body of the generic
3216 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
3217 and then Is_Compilation_Unit
(Defining_Entity
(N
))
3219 Needs_Body
:= False;
3224 -- Here is a defence against a ludicrous number of instantiations
3225 -- caused by a circular set of instantiation attempts.
3227 if Pending_Instantiations
.Last
>
3228 Hostparm
.Max_Instantiations
3230 Error_Msg_N
("too many instantiations", N
);
3231 raise Unrecoverable_Error
;
3234 -- Indicate that the enclosing scopes contain an instantiation,
3235 -- and that cleanup actions should be delayed until after the
3236 -- instance body is expanded.
3238 Check_Forward_Instantiation
(Gen_Decl
);
3239 if Nkind
(N
) = N_Package_Instantiation
then
3241 Enclosing_Master
: Entity_Id
;
3244 -- Loop to search enclosing masters
3246 Enclosing_Master
:= Current_Scope
;
3247 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
3248 if Ekind
(Enclosing_Master
) = E_Package
then
3249 if Is_Compilation_Unit
(Enclosing_Master
) then
3250 if In_Package_Body
(Enclosing_Master
) then
3252 (Body_Entity
(Enclosing_Master
));
3261 Enclosing_Master
:= Scope
(Enclosing_Master
);
3264 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
3265 Enclosing_Master
:= Scope
(Enclosing_Master
);
3267 elsif Is_Generic_Subprogram
(Enclosing_Master
)
3268 or else Ekind
(Enclosing_Master
) = E_Void
3270 -- Cleanup actions will eventually be performed on the
3271 -- enclosing instance, if any. Enclosing scope is void
3272 -- in the formal part of a generic subprogram.
3277 if Ekind
(Enclosing_Master
) = E_Entry
3279 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
3281 if not Expander_Active
then
3285 Protected_Body_Subprogram
(Enclosing_Master
);
3289 Set_Delay_Cleanups
(Enclosing_Master
);
3291 while Ekind
(Enclosing_Master
) = E_Block
loop
3292 Enclosing_Master
:= Scope
(Enclosing_Master
);
3295 if Is_Subprogram
(Enclosing_Master
) then
3296 Delay_Descriptors
(Enclosing_Master
);
3298 elsif Is_Task_Type
(Enclosing_Master
) then
3300 TBP
: constant Node_Id
:=
3301 Get_Task_Body_Procedure
3304 if Present
(TBP
) then
3305 Delay_Descriptors
(TBP
);
3306 Set_Delay_Cleanups
(TBP
);
3313 end loop Scope_Loop
;
3316 -- Make entry in table
3318 Pending_Instantiations
.Append
3320 Act_Decl
=> Act_Decl
,
3321 Expander_Status
=> Expander_Active
,
3322 Current_Sem_Unit
=> Current_Sem_Unit
,
3323 Scope_Suppress
=> Scope_Suppress
,
3324 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
));
3328 Set_Categorization_From_Pragmas
(Act_Decl
);
3330 if Parent_Installed
then
3334 Set_Instance_Spec
(N
, Act_Decl
);
3336 -- If not a compilation unit, insert the package declaration before
3337 -- the original instantiation node.
3339 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3340 Mark_Rewrite_Insertion
(Act_Decl
);
3341 Insert_Before
(N
, Act_Decl
);
3344 -- For an instantiation that is a compilation unit, place declaration
3345 -- on current node so context is complete for analysis (including
3346 -- nested instantiations). If this is the main unit, the declaration
3347 -- eventually replaces the instantiation node. If the instance body
3348 -- is created later, it replaces the instance node, and the
3349 -- declaration is attached to it (see
3350 -- Build_Instance_Compilation_Unit_Nodes).
3353 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
3355 -- The entity for the current unit is the newly created one,
3356 -- and all semantic information is attached to it.
3358 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
3360 -- If this is the main unit, replace the main entity as well
3362 if Current_Sem_Unit
= Main_Unit
then
3363 Main_Unit_Entity
:= Act_Decl_Id
;
3367 Set_Unit
(Parent
(N
), Act_Decl
);
3368 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3369 Set_Package_Instantiation
(Act_Decl_Id
, N
);
3371 Set_Unit
(Parent
(N
), N
);
3372 Set_Body_Required
(Parent
(N
), False);
3374 -- We never need elaboration checks on instantiations, since by
3375 -- definition, the body instantiation is elaborated at the same
3376 -- time as the spec instantiation.
3378 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3379 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3382 Check_Elab_Instantiation
(N
);
3384 if ABE_Is_Certain
(N
) and then Needs_Body
then
3385 Pending_Instantiations
.Decrement_Last
;
3388 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3390 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
3391 First_Private_Entity
(Act_Decl_Id
));
3393 -- If the instantiation will receive a body, the unit will be
3394 -- transformed into a package body, and receive its own elaboration
3395 -- entity. Otherwise, the nature of the unit is now a package
3398 if Nkind
(Parent
(N
)) = N_Compilation_Unit
3399 and then not Needs_Body
3401 Rewrite
(N
, Act_Decl
);
3404 if Present
(Corresponding_Body
(Gen_Decl
))
3405 or else Unit_Requires_Body
(Gen_Unit
)
3407 Set_Has_Completion
(Act_Decl_Id
);
3410 Check_Formal_Packages
(Act_Decl_Id
);
3412 Restore_Private_Views
(Act_Decl_Id
);
3414 Inherit_Context
(Gen_Decl
, N
);
3416 if Parent_Installed
then
3421 Env_Installed
:= False;
3424 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3426 -- Check restriction, but skip this if something went wrong in the above
3427 -- analysis, indicated by Act_Decl_Id being void.
3429 if Ekind
(Act_Decl_Id
) /= E_Void
3430 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
3432 Check_Restriction
(No_Local_Allocators
, N
);
3436 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
3439 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3440 -- be used as defining identifiers for a formal package and for the
3441 -- corresponding expanded package.
3443 if Nkind
(N
) = N_Formal_Package_Declaration
then
3444 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3445 Set_Comes_From_Source
(Act_Decl_Id
, True);
3446 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
3447 Set_Defining_Identifier
(N
, Act_Decl_Id
);
3451 when Instantiation_Error
=>
3452 if Parent_Installed
then
3456 if Env_Installed
then
3459 end Analyze_Package_Instantiation
;
3461 --------------------------
3462 -- Inline_Instance_Body --
3463 --------------------------
3465 procedure Inline_Instance_Body
3467 Gen_Unit
: Entity_Id
;
3471 Gen_Comp
: constant Entity_Id
:=
3472 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
3473 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
3474 Curr_Scope
: Entity_Id
:= Empty
;
3475 Curr_Unit
: constant Entity_Id
:=
3476 Cunit_Entity
(Current_Sem_Unit
);
3477 Removed
: Boolean := False;
3478 Num_Scopes
: Int
:= 0;
3480 Scope_Stack_Depth
: constant Int
:=
3481 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
3483 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
3484 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3485 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3486 Num_Inner
: Int
:= 0;
3487 N_Instances
: Int
:= 0;
3491 -- Case of generic unit defined in another unit. We must remove the
3492 -- complete context of the current unit to install that of the generic.
3494 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
3496 -- Add some comments for the following two loops ???
3499 while Present
(S
) and then S
/= Standard_Standard
loop
3501 Num_Scopes
:= Num_Scopes
+ 1;
3503 Use_Clauses
(Num_Scopes
) :=
3505 (Scope_Stack
.Last
- Num_Scopes
+ 1).
3507 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
3509 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
3510 or else Scope_Stack
.Table
3511 (Scope_Stack
.Last
- Num_Scopes
).Entity
3515 exit when Is_Generic_Instance
(S
)
3516 and then (In_Package_Body
(S
)
3517 or else Ekind
(S
) = E_Procedure
3518 or else Ekind
(S
) = E_Function
);
3522 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
3524 -- Find and save all enclosing instances
3529 and then S
/= Standard_Standard
3531 if Is_Generic_Instance
(S
) then
3532 N_Instances
:= N_Instances
+ 1;
3533 Instances
(N_Instances
) := S
;
3535 exit when In_Package_Body
(S
);
3541 -- Remove context of current compilation unit, unless we are within a
3542 -- nested package instantiation, in which case the context has been
3543 -- removed previously.
3545 -- If current scope is the body of a child unit, remove context of
3546 -- spec as well. If an enclosing scope is an instance body, the
3547 -- context has already been removed, but the entities in the body
3548 -- must be made invisible as well.
3553 and then S
/= Standard_Standard
3555 if Is_Generic_Instance
(S
)
3556 and then (In_Package_Body
(S
)
3557 or else Ekind
(S
) = E_Procedure
3558 or else Ekind
(S
) = E_Function
)
3560 -- We still have to remove the entities of the enclosing
3561 -- instance from direct visibility.
3566 E
:= First_Entity
(S
);
3567 while Present
(E
) loop
3568 Set_Is_Immediately_Visible
(E
, False);
3577 or else (Ekind
(Curr_Unit
) = E_Package_Body
3578 and then S
= Spec_Entity
(Curr_Unit
))
3579 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3582 (Unit_Declaration_Node
(Curr_Unit
)))
3586 -- Remove entities in current scopes from visibility, so that
3587 -- instance body is compiled in a clean environment.
3589 Save_Scope_Stack
(Handle_Use
=> False);
3591 if Is_Child_Unit
(S
) then
3593 -- Remove child unit from stack, as well as inner scopes.
3594 -- Removing the context of a child unit removes parent units
3597 while Current_Scope
/= S
loop
3598 Num_Inner
:= Num_Inner
+ 1;
3599 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3604 Remove_Context
(Curr_Comp
);
3608 Remove_Context
(Curr_Comp
);
3611 if Ekind
(Curr_Unit
) = E_Package_Body
then
3612 Remove_Context
(Library_Unit
(Curr_Comp
));
3618 pragma Assert
(Num_Inner
< Num_Scopes
);
3620 Push_Scope
(Standard_Standard
);
3621 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3622 Instantiate_Package_Body
3625 Act_Decl
=> Act_Decl
,
3626 Expander_Status
=> Expander_Active
,
3627 Current_Sem_Unit
=> Current_Sem_Unit
,
3628 Scope_Suppress
=> Scope_Suppress
,
3629 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
)),
3630 Inlined_Body
=> True);
3636 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3638 -- Reset Generic_Instance flag so that use clauses can be installed
3639 -- in the proper order. (See Use_One_Package for effect of enclosing
3640 -- instances on processing of use clauses).
3642 for J
in 1 .. N_Instances
loop
3643 Set_Is_Generic_Instance
(Instances
(J
), False);
3647 Install_Context
(Curr_Comp
);
3649 if Present
(Curr_Scope
)
3650 and then Is_Child_Unit
(Curr_Scope
)
3652 Push_Scope
(Curr_Scope
);
3653 Set_Is_Immediately_Visible
(Curr_Scope
);
3655 -- Finally, restore inner scopes as well
3657 for J
in reverse 1 .. Num_Inner
loop
3658 Push_Scope
(Inner_Scopes
(J
));
3662 Restore_Scope_Stack
(Handle_Use
=> False);
3664 if Present
(Curr_Scope
)
3666 (In_Private_Part
(Curr_Scope
)
3667 or else In_Package_Body
(Curr_Scope
))
3669 -- Install private declaration of ancestor units, which are
3670 -- currently available. Restore_Scope_Stack and Install_Context
3671 -- only install the visible part of parents.
3676 Par
:= Scope
(Curr_Scope
);
3677 while (Present
(Par
))
3678 and then Par
/= Standard_Standard
3680 Install_Private_Declarations
(Par
);
3687 -- Restore use clauses. For a child unit, use clauses in the parents
3688 -- are restored when installing the context, so only those in inner
3689 -- scopes (and those local to the child unit itself) need to be
3690 -- installed explicitly.
3692 if Is_Child_Unit
(Curr_Unit
)
3695 for J
in reverse 1 .. Num_Inner
+ 1 loop
3696 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3698 Install_Use_Clauses
(Use_Clauses
(J
));
3702 for J
in reverse 1 .. Num_Scopes
loop
3703 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3705 Install_Use_Clauses
(Use_Clauses
(J
));
3709 -- Restore status of instances. If one of them is a body, make
3710 -- its local entities visible again.
3717 for J
in 1 .. N_Instances
loop
3718 Inst
:= Instances
(J
);
3719 Set_Is_Generic_Instance
(Inst
, True);
3721 if In_Package_Body
(Inst
)
3722 or else Ekind
(S
) = E_Procedure
3723 or else Ekind
(S
) = E_Function
3725 E
:= First_Entity
(Instances
(J
));
3726 while Present
(E
) loop
3727 Set_Is_Immediately_Visible
(E
);
3734 -- If generic unit is in current unit, current context is correct
3737 Instantiate_Package_Body
3740 Act_Decl
=> Act_Decl
,
3741 Expander_Status
=> Expander_Active
,
3742 Current_Sem_Unit
=> Current_Sem_Unit
,
3743 Scope_Suppress
=> Scope_Suppress
,
3744 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
)),
3745 Inlined_Body
=> True);
3747 end Inline_Instance_Body
;
3749 -------------------------------------
3750 -- Analyze_Procedure_Instantiation --
3751 -------------------------------------
3753 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3755 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3756 end Analyze_Procedure_Instantiation
;
3758 --------------------------------------
3759 -- Analyze_Subprogram_Instantiation --
3760 --------------------------------------
3762 procedure Analyze_Subprogram_Instantiation
3766 Loc
: constant Source_Ptr
:= Sloc
(N
);
3767 Gen_Id
: constant Node_Id
:= Name
(N
);
3769 Anon_Id
: constant Entity_Id
:=
3770 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3771 Chars
=> New_External_Name
3772 (Chars
(Defining_Entity
(N
)), 'R'));
3774 Act_Decl_Id
: Entity_Id
;
3779 Env_Installed
: Boolean := False;
3780 Gen_Unit
: Entity_Id
;
3782 Pack_Id
: Entity_Id
;
3783 Parent_Installed
: Boolean := False;
3784 Renaming_List
: List_Id
;
3786 procedure Analyze_Instance_And_Renamings
;
3787 -- The instance must be analyzed in a context that includes the mappings
3788 -- of generic parameters into actuals. We create a package declaration
3789 -- for this purpose, and a subprogram with an internal name within the
3790 -- package. The subprogram instance is simply an alias for the internal
3791 -- subprogram, declared in the current scope.
3793 ------------------------------------
3794 -- Analyze_Instance_And_Renamings --
3795 ------------------------------------
3797 procedure Analyze_Instance_And_Renamings
is
3798 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3799 Pack_Decl
: Node_Id
;
3802 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3804 -- For the case of a compilation unit, the container package has
3805 -- the same name as the instantiation, to insure that the binder
3806 -- calls the elaboration procedure with the right name. Copy the
3807 -- entity of the instance, which may have compilation level flags
3808 -- (e.g. Is_Child_Unit) set.
3810 Pack_Id
:= New_Copy
(Def_Ent
);
3813 -- Otherwise we use the name of the instantiation concatenated
3814 -- with its source position to ensure uniqueness if there are
3815 -- several instantiations with the same name.
3818 Make_Defining_Identifier
(Loc
,
3819 Chars
=> New_External_Name
3820 (Related_Id
=> Chars
(Def_Ent
),
3822 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3825 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3826 Specification
=> Make_Package_Specification
(Loc
,
3827 Defining_Unit_Name
=> Pack_Id
,
3828 Visible_Declarations
=> Renaming_List
,
3829 End_Label
=> Empty
));
3831 Set_Instance_Spec
(N
, Pack_Decl
);
3832 Set_Is_Generic_Instance
(Pack_Id
);
3833 Set_Debug_Info_Needed
(Pack_Id
);
3835 -- Case of not a compilation unit
3837 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3838 Mark_Rewrite_Insertion
(Pack_Decl
);
3839 Insert_Before
(N
, Pack_Decl
);
3840 Set_Has_Completion
(Pack_Id
);
3842 -- Case of an instantiation that is a compilation unit
3844 -- Place declaration on current node so context is complete for
3845 -- analysis (including nested instantiations), and for use in a
3846 -- context_clause (see Analyze_With_Clause).
3849 Set_Unit
(Parent
(N
), Pack_Decl
);
3850 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3853 Analyze
(Pack_Decl
);
3854 Check_Formal_Packages
(Pack_Id
);
3855 Set_Is_Generic_Instance
(Pack_Id
, False);
3857 -- Body of the enclosing package is supplied when instantiating the
3858 -- subprogram body, after semantic analysis is completed.
3860 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3862 -- Remove package itself from visibility, so it does not
3863 -- conflict with subprogram.
3865 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3867 -- Set name and scope of internal subprogram so that the proper
3868 -- external name will be generated. The proper scope is the scope
3869 -- of the wrapper package. We need to generate debugging info for
3870 -- the internal subprogram, so set flag accordingly.
3872 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3873 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3875 -- Mark wrapper package as referenced, to avoid spurious warnings
3876 -- if the instantiation appears in various with_ clauses of
3877 -- subunits of the main unit.
3879 Set_Referenced
(Pack_Id
);
3882 Set_Is_Generic_Instance
(Anon_Id
);
3883 Set_Debug_Info_Needed
(Anon_Id
);
3884 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3886 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3887 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3888 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3889 Set_Comes_From_Source
(Act_Decl_Id
, True);
3891 -- The signature may involve types that are not frozen yet, but the
3892 -- subprogram will be frozen at the point the wrapper package is
3893 -- frozen, so it does not need its own freeze node. In fact, if one
3894 -- is created, it might conflict with the freezing actions from the
3897 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3899 -- If the instance is a child unit, mark the Id accordingly. Mark
3900 -- the anonymous entity as well, which is the real subprogram and
3901 -- which is used when the instance appears in a context clause.
3903 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3904 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3905 New_Overloaded_Entity
(Act_Decl_Id
);
3906 Check_Eliminated
(Act_Decl_Id
);
3908 -- In compilation unit case, kill elaboration checks on the
3909 -- instantiation, since they are never needed -- the body is
3910 -- instantiated at the same point as the spec.
3912 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3913 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3914 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3915 Set_Is_Compilation_Unit
(Anon_Id
);
3917 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3920 -- The instance is not a freezing point for the new subprogram
3922 Set_Is_Frozen
(Act_Decl_Id
, False);
3924 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3925 Valid_Operator_Definition
(Act_Decl_Id
);
3928 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3929 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3930 Set_Has_Completion
(Act_Decl_Id
);
3931 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3933 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3934 Set_Body_Required
(Parent
(N
), False);
3936 end Analyze_Instance_And_Renamings
;
3938 -- Start of processing for Analyze_Subprogram_Instantiation
3941 -- Very first thing: apply the special kludge for Text_IO processing
3942 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3943 -- Of course such an instantiation is bogus (these are packages, not
3944 -- subprograms), but we get a better error message if we do this.
3946 Text_IO_Kludge
(Gen_Id
);
3948 -- Make node global for error reporting
3950 Instantiation_Node
:= N
;
3951 Preanalyze_Actuals
(N
);
3954 Env_Installed
:= True;
3955 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3956 Gen_Unit
:= Entity
(Gen_Id
);
3958 Generate_Reference
(Gen_Unit
, Gen_Id
);
3960 if Nkind
(Gen_Id
) = N_Identifier
3961 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3964 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3967 if Etype
(Gen_Unit
) = Any_Type
then
3972 -- Verify that it is a generic subprogram of the right kind, and that
3973 -- it does not lead to a circular instantiation.
3975 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3976 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3978 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3980 elsif In_Open_Scopes
(Gen_Unit
) then
3981 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3983 elsif K
= E_Procedure
3984 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3986 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3988 ("cannot instantiate generic function as procedure", Gen_Id
);
3991 ("expect name of generic procedure in instantiation", Gen_Id
);
3994 elsif K
= E_Function
3995 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3997 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3999 ("cannot instantiate generic procedure as function", Gen_Id
);
4002 ("expect name of generic function in instantiation", Gen_Id
);
4006 Set_Entity
(Gen_Id
, Gen_Unit
);
4007 Set_Is_Instantiated
(Gen_Unit
);
4009 if In_Extended_Main_Source_Unit
(N
) then
4010 Generate_Reference
(Gen_Unit
, N
);
4013 -- If renaming, get original unit
4015 if Present
(Renamed_Object
(Gen_Unit
))
4016 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
4018 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
4020 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4021 Set_Is_Instantiated
(Gen_Unit
);
4022 Generate_Reference
(Gen_Unit
, N
);
4025 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4026 Error_Msg_Node_2
:= Current_Scope
;
4028 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4029 Circularity_Detected
:= True;
4033 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4035 -- Initialize renamings map, for error checking
4037 Generic_Renamings
.Set_Last
(0);
4038 Generic_Renamings_HTable
.Reset
;
4040 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
4042 -- Copy original generic tree, to produce text for instantiation
4046 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4048 -- Inherit overriding indicator from instance node
4050 Act_Spec
:= Specification
(Act_Tree
);
4051 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
4052 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
4055 Analyze_Associations
4057 Generic_Formal_Declarations
(Act_Tree
),
4058 Generic_Formal_Declarations
(Gen_Decl
));
4060 -- The subprogram itself cannot contain a nested instance, so the
4061 -- current parent is left empty.
4063 Set_Instance_Env
(Gen_Unit
, Empty
);
4065 -- Build the subprogram declaration, which does not appear in the
4066 -- generic template, and give it a sloc consistent with that of the
4069 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
4070 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4072 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
4073 Specification
=> Act_Spec
);
4075 Set_Categorization_From_Pragmas
(Act_Decl
);
4077 if Parent_Installed
then
4081 Append
(Act_Decl
, Renaming_List
);
4082 Analyze_Instance_And_Renamings
;
4084 -- If the generic is marked Import (Intrinsic), then so is the
4085 -- instance. This indicates that there is no body to instantiate. If
4086 -- generic is marked inline, so it the instance, and the anonymous
4087 -- subprogram it renames. If inlined, or else if inlining is enabled
4088 -- for the compilation, we generate the instance body even if it is
4089 -- not within the main unit.
4091 -- Any other pragmas might also be inherited ???
4093 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
4094 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
4095 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
4097 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
4098 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
4102 Generate_Definition
(Act_Decl_Id
);
4104 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
4105 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
4107 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
4108 Check_Elab_Instantiation
(N
);
4111 if Is_Dispatching_Operation
(Act_Decl_Id
)
4112 and then Ada_Version
>= Ada_05
4118 Formal
:= First_Formal
(Act_Decl_Id
);
4119 while Present
(Formal
) loop
4120 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
4121 and then Is_Controlling_Formal
(Formal
)
4122 and then not Can_Never_Be_Null
(Formal
)
4124 Error_Msg_NE
("access parameter& is controlling,",
4126 Error_Msg_NE
("\corresponding parameter of & must be"
4127 & " explicitly null-excluding", N
, Gen_Id
);
4130 Next_Formal
(Formal
);
4135 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4137 -- Subject to change, pending on if other pragmas are inherited ???
4139 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4141 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
4142 Inherit_Context
(Gen_Decl
, N
);
4144 Restore_Private_Views
(Pack_Id
, False);
4146 -- If the context requires a full instantiation, mark node for
4147 -- subsequent construction of the body.
4149 if (Is_In_Main_Unit
(N
)
4150 or else Is_Inlined
(Act_Decl_Id
))
4151 and then (Operating_Mode
= Generate_Code
4152 or else (Operating_Mode
= Check_Semantics
4153 and then ASIS_Mode
))
4154 and then (Expander_Active
or else ASIS_Mode
)
4155 and then not ABE_Is_Certain
(N
)
4156 and then not Is_Eliminated
(Act_Decl_Id
)
4158 Pending_Instantiations
.Append
4160 Act_Decl
=> Act_Decl
,
4161 Expander_Status
=> Expander_Active
,
4162 Current_Sem_Unit
=> Current_Sem_Unit
,
4163 Scope_Suppress
=> Scope_Suppress
,
4164 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
));
4166 Check_Forward_Instantiation
(Gen_Decl
);
4168 -- The wrapper package is always delayed, because it does not
4169 -- constitute a freeze point, but to insure that the freeze
4170 -- node is placed properly, it is created directly when
4171 -- instantiating the body (otherwise the freeze node might
4172 -- appear to early for nested instantiations).
4174 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4176 -- For ASIS purposes, indicate that the wrapper package has
4177 -- replaced the instantiation node.
4179 Rewrite
(N
, Unit
(Parent
(N
)));
4180 Set_Unit
(Parent
(N
), N
);
4183 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4185 -- Replace instance node for library-level instantiations of
4186 -- intrinsic subprograms, for ASIS use.
4188 Rewrite
(N
, Unit
(Parent
(N
)));
4189 Set_Unit
(Parent
(N
), N
);
4192 if Parent_Installed
then
4197 Env_Installed
:= False;
4198 Generic_Renamings
.Set_Last
(0);
4199 Generic_Renamings_HTable
.Reset
;
4203 when Instantiation_Error
=>
4204 if Parent_Installed
then
4208 if Env_Installed
then
4211 end Analyze_Subprogram_Instantiation
;
4213 -------------------------
4214 -- Get_Associated_Node --
4215 -------------------------
4217 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
4221 Assoc
:= Associated_Node
(N
);
4223 if Nkind
(Assoc
) /= Nkind
(N
) then
4226 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
4230 -- If the node is part of an inner generic, it may itself have been
4231 -- remapped into a further generic copy. Associated_Node is otherwise
4232 -- used for the entity of the node, and will be of a different node
4233 -- kind, or else N has been rewritten as a literal or function call.
4235 while Present
(Associated_Node
(Assoc
))
4236 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
4238 Assoc
:= Associated_Node
(Assoc
);
4241 -- Follow and additional link in case the final node was rewritten.
4242 -- This can only happen with nested generic units.
4244 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
4245 and then Present
(Associated_Node
(Assoc
))
4246 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
4247 N_Explicit_Dereference
,
4252 Assoc
:= Associated_Node
(Assoc
);
4257 end Get_Associated_Node
;
4259 -------------------------------------------
4260 -- Build_Instance_Compilation_Unit_Nodes --
4261 -------------------------------------------
4263 procedure Build_Instance_Compilation_Unit_Nodes
4268 Decl_Cunit
: Node_Id
;
4269 Body_Cunit
: Node_Id
;
4271 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
4272 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
4275 -- A new compilation unit node is built for the instance declaration
4278 Make_Compilation_Unit
(Sloc
(N
),
4279 Context_Items
=> Empty_List
,
4282 Make_Compilation_Unit_Aux
(Sloc
(N
)));
4284 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4285 Set_Body_Required
(Decl_Cunit
, True);
4287 -- We use the original instantiation compilation unit as the resulting
4288 -- compilation unit of the instance, since this is the main unit.
4290 Rewrite
(N
, Act_Body
);
4291 Body_Cunit
:= Parent
(N
);
4293 -- The two compilation unit nodes are linked by the Library_Unit field
4295 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
4296 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
4298 -- Preserve the private nature of the package if needed
4300 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
4302 -- If the instance is not the main unit, its context, categorization,
4303 -- and elaboration entity are not relevant to the compilation.
4305 if Parent
(N
) /= Cunit
(Main_Unit
) then
4309 -- The context clause items on the instantiation, which are now attached
4310 -- to the body compilation unit (since the body overwrote the original
4311 -- instantiation node), semantically belong on the spec, so copy them
4312 -- there. It's harmless to leave them on the body as well. In fact one
4313 -- could argue that they belong in both places.
4315 Citem
:= First
(Context_Items
(Body_Cunit
));
4316 while Present
(Citem
) loop
4317 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
4321 -- Propagate categorization flags on packages, so that they appear in
4322 -- the ali file for the spec of the unit.
4324 if Ekind
(New_Main
) = E_Package
then
4325 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
4326 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
4327 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
4328 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
4329 Set_Is_Remote_Call_Interface
4330 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
4333 -- Make entry in Units table, so that binder can generate call to
4334 -- elaboration procedure for body, if any.
4336 Make_Instance_Unit
(Body_Cunit
);
4337 Main_Unit_Entity
:= New_Main
;
4338 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
4340 -- Build elaboration entity, since the instance may certainly generate
4341 -- elaboration code requiring a flag for protection.
4343 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
4344 end Build_Instance_Compilation_Unit_Nodes
;
4346 -----------------------------
4347 -- Check_Access_Definition --
4348 -----------------------------
4350 procedure Check_Access_Definition
(N
: Node_Id
) is
4353 (Ada_Version
>= Ada_05
4354 and then Present
(Access_Definition
(N
)));
4356 end Check_Access_Definition
;
4358 -----------------------------------
4359 -- Check_Formal_Package_Instance --
4360 -----------------------------------
4362 -- If the formal has specific parameters, they must match those of the
4363 -- actual. Both of them are instances, and the renaming declarations for
4364 -- their formal parameters appear in the same order in both. The analyzed
4365 -- formal has been analyzed in the context of the current instance.
4367 procedure Check_Formal_Package_Instance
4368 (Formal_Pack
: Entity_Id
;
4369 Actual_Pack
: Entity_Id
)
4371 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
4372 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
4377 procedure Check_Mismatch
(B
: Boolean);
4378 -- Common error routine for mismatch between the parameters of the
4379 -- actual instance and those of the formal package.
4381 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
4382 -- The formal may come from a nested formal package, and the actual may
4383 -- have been constant-folded. To determine whether the two denote the
4384 -- same entity we may have to traverse several definitions to recover
4385 -- the ultimate entity that they refer to.
4387 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
4388 -- Similarly, if the formal comes from a nested formal package, the
4389 -- actual may designate the formal through multiple renamings, which
4390 -- have to be followed to determine the original variable in question.
4392 --------------------
4393 -- Check_Mismatch --
4394 --------------------
4396 procedure Check_Mismatch
(B
: Boolean) is
4397 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
4400 if Kind
= N_Formal_Type_Declaration
then
4403 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
4404 N_Formal_Package_Declaration
)
4405 or else Kind
in N_Formal_Subprogram_Declaration
4411 ("actual for & in actual instance does not match formal",
4412 Parent
(Actual_Pack
), E1
);
4416 --------------------------------
4417 -- Same_Instantiated_Constant --
4418 --------------------------------
4420 function Same_Instantiated_Constant
4421 (E1
, E2
: Entity_Id
) return Boolean
4427 while Present
(Ent
) loop
4431 elsif Ekind
(Ent
) /= E_Constant
then
4434 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
4435 if Entity
(Constant_Value
(Ent
)) = E1
then
4438 Ent
:= Entity
(Constant_Value
(Ent
));
4441 -- The actual may be a constant that has been folded. Recover
4444 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
4445 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
4452 end Same_Instantiated_Constant
;
4454 --------------------------------
4455 -- Same_Instantiated_Variable --
4456 --------------------------------
4458 function Same_Instantiated_Variable
4459 (E1
, E2
: Entity_Id
) return Boolean
4461 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
4462 -- Follow chain of renamings to the ultimate ancestor
4464 ---------------------
4465 -- Original_Entity --
4466 ---------------------
4468 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
4473 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
4474 and then Present
(Renamed_Object
(Orig
))
4475 and then Is_Entity_Name
(Renamed_Object
(Orig
))
4477 Orig
:= Entity
(Renamed_Object
(Orig
));
4481 end Original_Entity
;
4483 -- Start of processing for Same_Instantiated_Variable
4486 return Ekind
(E1
) = Ekind
(E2
)
4487 and then Original_Entity
(E1
) = Original_Entity
(E2
);
4488 end Same_Instantiated_Variable
;
4490 -- Start of processing for Check_Formal_Package_Instance
4494 and then Present
(E2
)
4496 exit when Ekind
(E1
) = E_Package
4497 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
4499 -- If the formal is the renaming of the formal package, this
4500 -- is the end of its formal part, which may occur before the
4501 -- end of the formal part in the actual in the presence of
4502 -- defaulted parameters in the formal package.
4504 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
4505 and then Renamed_Entity
(E2
) = Scope
(E2
);
4507 -- The analysis of the actual may generate additional internal
4508 -- entities. If the formal is defaulted, there is no corresponding
4509 -- analysis and the internal entities must be skipped, until we
4510 -- find corresponding entities again.
4512 if Comes_From_Source
(E2
)
4513 and then not Comes_From_Source
(E1
)
4514 and then Chars
(E1
) /= Chars
(E2
)
4517 and then Chars
(E1
) /= Chars
(E2
)
4526 -- If the formal entity comes from a formal declaration, it was
4527 -- defaulted in the formal package, and no check is needed on it.
4529 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
4532 elsif Is_Type
(E1
) then
4534 -- Subtypes must statically match. E1, E2 are the local entities
4535 -- that are subtypes of the actuals. Itypes generated for other
4536 -- parameters need not be checked, the check will be performed
4537 -- on the parameters themselves.
4539 -- If E2 is a formal type declaration, it is a defaulted parameter
4540 -- and needs no checking.
4542 if not Is_Itype
(E1
)
4543 and then not Is_Itype
(E2
)
4547 or else Etype
(E1
) /= Etype
(E2
)
4548 or else not Subtypes_Statically_Match
(E1
, E2
));
4551 elsif Ekind
(E1
) = E_Constant
then
4553 -- IN parameters must denote the same static value, or the same
4554 -- constant, or the literal null.
4556 Expr1
:= Expression
(Parent
(E1
));
4558 if Ekind
(E2
) /= E_Constant
then
4559 Check_Mismatch
(True);
4562 Expr2
:= Expression
(Parent
(E2
));
4565 if Is_Static_Expression
(Expr1
) then
4567 if not Is_Static_Expression
(Expr2
) then
4568 Check_Mismatch
(True);
4570 elsif Is_Discrete_Type
(Etype
(E1
)) then
4572 V1
: constant Uint
:= Expr_Value
(Expr1
);
4573 V2
: constant Uint
:= Expr_Value
(Expr2
);
4575 Check_Mismatch
(V1
/= V2
);
4578 elsif Is_Real_Type
(Etype
(E1
)) then
4580 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
4581 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
4583 Check_Mismatch
(V1
/= V2
);
4586 elsif Is_String_Type
(Etype
(E1
))
4587 and then Nkind
(Expr1
) = N_String_Literal
4589 if Nkind
(Expr2
) /= N_String_Literal
then
4590 Check_Mismatch
(True);
4593 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
4597 elsif Is_Entity_Name
(Expr1
) then
4598 if Is_Entity_Name
(Expr2
) then
4599 if Entity
(Expr1
) = Entity
(Expr2
) then
4603 (not Same_Instantiated_Constant
4604 (Entity
(Expr1
), Entity
(Expr2
)));
4607 Check_Mismatch
(True);
4610 elsif Is_Entity_Name
(Original_Node
(Expr1
))
4611 and then Is_Entity_Name
(Expr2
)
4613 Same_Instantiated_Constant
4614 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
4618 elsif Nkind
(Expr1
) = N_Null
then
4619 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
4622 Check_Mismatch
(True);
4625 elsif Ekind
(E1
) = E_Variable
then
4626 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
4628 elsif Ekind
(E1
) = E_Package
then
4630 (Ekind
(E1
) /= Ekind
(E2
)
4631 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
4633 elsif Is_Overloadable
(E1
) then
4635 -- Verify that the actual subprograms match. Note that actuals
4636 -- that are attributes are rewritten as subprograms. If the
4637 -- subprogram in the formal package is defaulted, no check is
4638 -- needed. Note that this can only happen in Ada 2005 when the
4639 -- formal package can be partially parametrized.
4641 if Nkind
(Unit_Declaration_Node
(E1
)) =
4642 N_Subprogram_Renaming_Declaration
4643 and then From_Default
(Unit_Declaration_Node
(E1
))
4649 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
4653 raise Program_Error
;
4660 end Check_Formal_Package_Instance
;
4662 ---------------------------
4663 -- Check_Formal_Packages --
4664 ---------------------------
4666 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
4668 Formal_P
: Entity_Id
;
4671 -- Iterate through the declarations in the instance, looking for package
4672 -- renaming declarations that denote instances of formal packages. Stop
4673 -- when we find the renaming of the current package itself. The
4674 -- declaration for a formal package without a box is followed by an
4675 -- internal entity that repeats the instantiation.
4677 E
:= First_Entity
(P_Id
);
4678 while Present
(E
) loop
4679 if Ekind
(E
) = E_Package
then
4680 if Renamed_Object
(E
) = P_Id
then
4683 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4686 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4687 Formal_P
:= Next_Entity
(E
);
4688 Check_Formal_Package_Instance
(Formal_P
, E
);
4690 -- After checking, remove the internal validating package. It
4691 -- is only needed for semantic checks, and as it may contain
4692 -- generic formal declarations it should not reach gigi.
4694 Remove
(Unit_Declaration_Node
(Formal_P
));
4700 end Check_Formal_Packages
;
4702 ---------------------------------
4703 -- Check_Forward_Instantiation --
4704 ---------------------------------
4706 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
4708 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
4711 -- The instantiation appears before the generic body if we are in the
4712 -- scope of the unit containing the generic, either in its spec or in
4713 -- the package body, and before the generic body.
4715 if Ekind
(Gen_Comp
) = E_Package_Body
then
4716 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
4719 if In_Open_Scopes
(Gen_Comp
)
4720 and then No
(Corresponding_Body
(Decl
))
4725 and then not Is_Compilation_Unit
(S
)
4726 and then not Is_Child_Unit
(S
)
4728 if Ekind
(S
) = E_Package
then
4729 Set_Has_Forward_Instantiation
(S
);
4735 end Check_Forward_Instantiation
;
4737 ---------------------------
4738 -- Check_Generic_Actuals --
4739 ---------------------------
4741 -- The visibility of the actuals may be different between the point of
4742 -- generic instantiation and the instantiation of the body.
4744 procedure Check_Generic_Actuals
4745 (Instance
: Entity_Id
;
4746 Is_Formal_Box
: Boolean)
4751 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4752 -- For a formal that is an array type, the component type is often a
4753 -- previous formal in the same unit. The privacy status of the component
4754 -- type will have been examined earlier in the traversal of the
4755 -- corresponding actuals, and this status should not be modified for the
4756 -- array type itself.
4758 -- To detect this case we have to rescan the list of formals, which
4759 -- is usually short enough to ignore the resulting inefficiency.
4761 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4764 Prev
:= First_Entity
(Instance
);
4765 while Present
(Prev
) loop
4767 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4768 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4769 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4779 end Denotes_Previous_Actual
;
4781 -- Start of processing for Check_Generic_Actuals
4784 E
:= First_Entity
(Instance
);
4785 while Present
(E
) loop
4787 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4788 and then Scope
(Etype
(E
)) /= Instance
4789 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4791 if Is_Array_Type
(E
)
4792 and then Denotes_Previous_Actual
(Component_Type
(E
))
4796 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4798 Set_Is_Generic_Actual_Type
(E
, True);
4799 Set_Is_Hidden
(E
, False);
4800 Set_Is_Potentially_Use_Visible
(E
,
4803 -- We constructed the generic actual type as a subtype of the
4804 -- supplied type. This means that it normally would not inherit
4805 -- subtype specific attributes of the actual, which is wrong for
4806 -- the generic case.
4808 Astype
:= Ancestor_Subtype
(E
);
4812 -- This can happen when E is an itype that is the full view of
4813 -- a private type completed, e.g. with a constrained array. In
4814 -- that case, use the first subtype, which will carry size
4815 -- information. The base type itself is unconstrained and will
4818 Astype
:= First_Subtype
(E
);
4821 Set_Size_Info
(E
, (Astype
));
4822 Set_RM_Size
(E
, RM_Size
(Astype
));
4823 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4825 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4826 Set_RM_Size
(E
, RM_Size
(Astype
));
4828 -- In nested instances, the base type of an access actual
4829 -- may itself be private, and need to be exchanged.
4831 elsif Is_Access_Type
(E
)
4832 and then Is_Private_Type
(Etype
(E
))
4835 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4838 elsif Ekind
(E
) = E_Package
then
4840 -- If this is the renaming for the current instance, we're done.
4841 -- Otherwise it is a formal package. If the corresponding formal
4842 -- was declared with a box, the (instantiations of the) generic
4843 -- formal part are also visible. Otherwise, ignore the entity
4844 -- created to validate the actuals.
4846 if Renamed_Object
(E
) = Instance
then
4849 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4852 -- The visibility of a formal of an enclosing generic is already
4855 elsif Denotes_Formal_Package
(E
) then
4858 elsif Present
(Associated_Formal_Package
(E
))
4859 and then not Is_Generic_Formal
(E
)
4861 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4862 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4865 Check_Generic_Actuals
(Renamed_Object
(E
), False);
4868 Set_Is_Hidden
(E
, False);
4871 -- If this is a subprogram instance (in a wrapper package) the
4872 -- actual is fully visible.
4874 elsif Is_Wrapper_Package
(Instance
) then
4875 Set_Is_Hidden
(E
, False);
4877 -- If the formal package is declared with a box, or if the formal
4878 -- parameter is defaulted, it is visible in the body.
4881 or else Is_Visible_Formal
(E
)
4883 Set_Is_Hidden
(E
, False);
4888 end Check_Generic_Actuals
;
4890 ------------------------------
4891 -- Check_Generic_Child_Unit --
4892 ------------------------------
4894 procedure Check_Generic_Child_Unit
4896 Parent_Installed
: in out Boolean)
4898 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4899 Gen_Par
: Entity_Id
:= Empty
;
4901 Inst_Par
: Entity_Id
;
4904 function Find_Generic_Child
4906 Id
: Node_Id
) return Entity_Id
;
4907 -- Search generic parent for possible child unit with the given name
4909 function In_Enclosing_Instance
return Boolean;
4910 -- Within an instance of the parent, the child unit may be denoted
4911 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4912 -- scopes to locate a possible parent instantiation.
4914 ------------------------
4915 -- Find_Generic_Child --
4916 ------------------------
4918 function Find_Generic_Child
4920 Id
: Node_Id
) return Entity_Id
4925 -- If entity of name is already set, instance has already been
4926 -- resolved, e.g. in an enclosing instantiation.
4928 if Present
(Entity
(Id
)) then
4929 if Scope
(Entity
(Id
)) = Scop
then
4936 E
:= First_Entity
(Scop
);
4937 while Present
(E
) loop
4938 if Chars
(E
) = Chars
(Id
)
4939 and then Is_Child_Unit
(E
)
4941 if Is_Child_Unit
(E
)
4942 and then not Is_Visible_Child_Unit
(E
)
4945 ("generic child unit& is not visible", Gen_Id
, E
);
4957 end Find_Generic_Child
;
4959 ---------------------------
4960 -- In_Enclosing_Instance --
4961 ---------------------------
4963 function In_Enclosing_Instance
return Boolean is
4964 Enclosing_Instance
: Node_Id
;
4965 Instance_Decl
: Node_Id
;
4968 -- We do not inline any call that contains instantiations, except
4969 -- for instantiations of Unchecked_Conversion, so if we are within
4970 -- an inlined body the current instance does not require parents.
4972 if In_Inlined_Body
then
4973 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
4977 -- Loop to check enclosing scopes
4979 Enclosing_Instance
:= Current_Scope
;
4980 while Present
(Enclosing_Instance
) loop
4981 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4983 if Ekind
(Enclosing_Instance
) = E_Package
4984 and then Is_Generic_Instance
(Enclosing_Instance
)
4986 (Generic_Parent
(Specification
(Instance_Decl
)))
4988 -- Check whether the generic we are looking for is a child of
4991 E
:= Find_Generic_Child
4992 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4993 exit when Present
(E
);
4999 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
5011 Make_Expanded_Name
(Loc
,
5013 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
5014 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
5016 Set_Entity
(Gen_Id
, E
);
5017 Set_Etype
(Gen_Id
, Etype
(E
));
5018 Parent_Installed
:= False; -- Already in scope.
5021 end In_Enclosing_Instance
;
5023 -- Start of processing for Check_Generic_Child_Unit
5026 -- If the name of the generic is given by a selected component, it may
5027 -- be the name of a generic child unit, and the prefix is the name of an
5028 -- instance of the parent, in which case the child unit must be visible.
5029 -- If this instance is not in scope, it must be placed there and removed
5030 -- after instantiation, because what is being instantiated is not the
5031 -- original child, but the corresponding child present in the instance
5034 -- If the child is instantiated within the parent, it can be given by
5035 -- a simple name. In this case the instance is already in scope, but
5036 -- the child generic must be recovered from the generic parent as well.
5038 if Nkind
(Gen_Id
) = N_Selected_Component
then
5039 S
:= Selector_Name
(Gen_Id
);
5040 Analyze
(Prefix
(Gen_Id
));
5041 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5043 if Ekind
(Inst_Par
) = E_Package
5044 and then Present
(Renamed_Object
(Inst_Par
))
5046 Inst_Par
:= Renamed_Object
(Inst_Par
);
5049 if Ekind
(Inst_Par
) = E_Package
then
5050 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
5051 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
5053 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
5055 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
5057 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
5060 elsif Ekind
(Inst_Par
) = E_Generic_Package
5061 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
5063 -- A formal package may be a real child package, and not the
5064 -- implicit instance within a parent. In this case the child is
5065 -- not visible and has to be retrieved explicitly as well.
5067 Gen_Par
:= Inst_Par
;
5070 if Present
(Gen_Par
) then
5072 -- The prefix denotes an instantiation. The entity itself may be a
5073 -- nested generic, or a child unit.
5075 E
:= Find_Generic_Child
(Gen_Par
, S
);
5078 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
5079 Set_Entity
(Gen_Id
, E
);
5080 Set_Etype
(Gen_Id
, Etype
(E
));
5082 Set_Etype
(S
, Etype
(E
));
5084 -- Indicate that this is a reference to the parent
5086 if In_Extended_Main_Source_Unit
(Gen_Id
) then
5087 Set_Is_Instantiated
(Inst_Par
);
5090 -- A common mistake is to replicate the naming scheme of a
5091 -- hierarchy by instantiating a generic child directly, rather
5092 -- than the implicit child in a parent instance:
5094 -- generic .. package Gpar is ..
5095 -- generic .. package Gpar.Child is ..
5096 -- package Par is new Gpar ();
5099 -- package Par.Child is new Gpar.Child ();
5100 -- rather than Par.Child
5102 -- In this case the instantiation is within Par, which is an
5103 -- instance, but Gpar does not denote Par because we are not IN
5104 -- the instance of Gpar, so this is illegal. The test below
5105 -- recognizes this particular case.
5107 if Is_Child_Unit
(E
)
5108 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
5109 and then (not In_Instance
5110 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
5114 ("prefix of generic child unit must be instance of parent",
5118 if not In_Open_Scopes
(Inst_Par
)
5119 and then Nkind
(Parent
(Gen_Id
)) not in
5120 N_Generic_Renaming_Declaration
5122 Install_Parent
(Inst_Par
);
5123 Parent_Installed
:= True;
5125 elsif In_Open_Scopes
(Inst_Par
) then
5127 -- If the parent is already installed verify that the
5128 -- actuals for its formal packages declared with a box
5129 -- are already installed. This is necessary when the
5130 -- child instance is a child of the parent instance.
5131 -- In this case the parent is placed on the scope stack
5132 -- but the formal packages are not made visible.
5134 Install_Formal_Packages
(Inst_Par
);
5138 -- If the generic parent does not contain an entity that
5139 -- corresponds to the selector, the instance doesn't either.
5140 -- Analyzing the node will yield the appropriate error message.
5141 -- If the entity is not a child unit, then it is an inner
5142 -- generic in the parent.
5150 if Is_Child_Unit
(Entity
(Gen_Id
))
5152 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5153 and then not In_Open_Scopes
(Inst_Par
)
5155 Install_Parent
(Inst_Par
);
5156 Parent_Installed
:= True;
5160 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
5162 -- Entity already present, analyze prefix, whose meaning may be
5163 -- an instance in the current context. If it is an instance of
5164 -- a relative within another, the proper parent may still have
5165 -- to be installed, if they are not of the same generation.
5167 Analyze
(Prefix
(Gen_Id
));
5169 -- In the unlikely case that a local declaration hides the name
5170 -- of the parent package, locate it on the homonym chain. If the
5171 -- context is an instance of the parent, the renaming entity is
5174 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5175 while Present
(Inst_Par
)
5176 and then Ekind
(Inst_Par
) /= E_Package
5177 and then Ekind
(Inst_Par
) /= E_Generic_Package
5179 Inst_Par
:= Homonym
(Inst_Par
);
5182 pragma Assert
(Present
(Inst_Par
));
5183 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
5185 if In_Enclosing_Instance
then
5188 elsif Present
(Entity
(Gen_Id
))
5189 and then Is_Child_Unit
(Entity
(Gen_Id
))
5190 and then not In_Open_Scopes
(Inst_Par
)
5192 Install_Parent
(Inst_Par
);
5193 Parent_Installed
:= True;
5196 elsif In_Enclosing_Instance
then
5198 -- The child unit is found in some enclosing scope
5205 -- If this is the renaming of the implicit child in a parent
5206 -- instance, recover the parent name and install it.
5208 if Is_Entity_Name
(Gen_Id
) then
5209 E
:= Entity
(Gen_Id
);
5211 if Is_Generic_Unit
(E
)
5212 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
5213 and then Is_Child_Unit
(Renamed_Object
(E
))
5214 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
5215 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
5218 New_Copy_Tree
(Name
(Parent
(E
))));
5219 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5221 if not In_Open_Scopes
(Inst_Par
) then
5222 Install_Parent
(Inst_Par
);
5223 Parent_Installed
:= True;
5226 -- If it is a child unit of a non-generic parent, it may be
5227 -- use-visible and given by a direct name. Install parent as
5230 elsif Is_Generic_Unit
(E
)
5231 and then Is_Child_Unit
(E
)
5233 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5234 and then not Is_Generic_Unit
(Scope
(E
))
5236 if not In_Open_Scopes
(Scope
(E
)) then
5237 Install_Parent
(Scope
(E
));
5238 Parent_Installed
:= True;
5243 end Check_Generic_Child_Unit
;
5245 -----------------------------
5246 -- Check_Hidden_Child_Unit --
5247 -----------------------------
5249 procedure Check_Hidden_Child_Unit
5251 Gen_Unit
: Entity_Id
;
5252 Act_Decl_Id
: Entity_Id
)
5254 Gen_Id
: constant Node_Id
:= Name
(N
);
5257 if Is_Child_Unit
(Gen_Unit
)
5258 and then Is_Child_Unit
(Act_Decl_Id
)
5259 and then Nkind
(Gen_Id
) = N_Expanded_Name
5260 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
5261 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
5263 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
5265 ("generic unit & is implicitly declared in &",
5266 Defining_Unit_Name
(N
), Gen_Unit
);
5267 Error_Msg_N
("\instance must have different name",
5268 Defining_Unit_Name
(N
));
5270 end Check_Hidden_Child_Unit
;
5272 ------------------------
5273 -- Check_Private_View --
5274 ------------------------
5276 procedure Check_Private_View
(N
: Node_Id
) is
5277 T
: constant Entity_Id
:= Etype
(N
);
5281 -- Exchange views if the type was not private in the generic but is
5282 -- private at the point of instantiation. Do not exchange views if
5283 -- the scope of the type is in scope. This can happen if both generic
5284 -- and instance are sibling units, or if type is defined in a parent.
5285 -- In this case the visibility of the type will be correct for all
5289 BT
:= Base_Type
(T
);
5291 if Is_Private_Type
(T
)
5292 and then not Has_Private_View
(N
)
5293 and then Present
(Full_View
(T
))
5294 and then not In_Open_Scopes
(Scope
(T
))
5296 -- In the generic, the full type was visible. Save the private
5297 -- entity, for subsequent exchange.
5301 elsif Has_Private_View
(N
)
5302 and then not Is_Private_Type
(T
)
5303 and then not Has_Been_Exchanged
(T
)
5304 and then Etype
(Get_Associated_Node
(N
)) /= T
5306 -- Only the private declaration was visible in the generic. If
5307 -- the type appears in a subtype declaration, the subtype in the
5308 -- instance must have a view compatible with that of its parent,
5309 -- which must be exchanged (see corresponding code in Restore_
5310 -- Private_Views). Otherwise, if the type is defined in a parent
5311 -- unit, leave full visibility within instance, which is safe.
5313 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
5314 and then not Is_Private_Type
(Base_Type
(T
))
5315 and then Comes_From_Source
(Base_Type
(T
))
5319 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
5320 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
5322 Prepend_Elmt
(T
, Exchanged_Views
);
5323 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
5326 -- For composite types with inconsistent representation exchange
5327 -- component types accordingly.
5329 elsif Is_Access_Type
(T
)
5330 and then Is_Private_Type
(Designated_Type
(T
))
5331 and then not Has_Private_View
(N
)
5332 and then Present
(Full_View
(Designated_Type
(T
)))
5334 Switch_View
(Designated_Type
(T
));
5336 elsif Is_Array_Type
(T
) then
5337 if Is_Private_Type
(Component_Type
(T
))
5338 and then not Has_Private_View
(N
)
5339 and then Present
(Full_View
(Component_Type
(T
)))
5341 Switch_View
(Component_Type
(T
));
5344 -- The normal exchange mechanism relies on the setting of a
5345 -- flag on the reference in the generic. However, an additional
5346 -- mechanism is needed for types that are not explicitly mentioned
5347 -- in the generic, but may be needed in expanded code in the
5348 -- instance. This includes component types of arrays and
5349 -- designated types of access types. This processing must also
5350 -- include the index types of arrays which we take care of here.
5357 Indx
:= First_Index
(T
);
5358 Typ
:= Base_Type
(Etype
(Indx
));
5359 while Present
(Indx
) loop
5360 if Is_Private_Type
(Typ
)
5361 and then Present
(Full_View
(Typ
))
5370 elsif Is_Private_Type
(T
)
5371 and then Present
(Full_View
(T
))
5372 and then Is_Array_Type
(Full_View
(T
))
5373 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
5377 -- Finally, a non-private subtype may have a private base type, which
5378 -- must be exchanged for consistency. This can happen when a package
5379 -- body is instantiated, when the scope stack is empty but in fact
5380 -- the subtype and the base type are declared in an enclosing scope.
5382 -- Note that in this case we introduce an inconsistency in the view
5383 -- set, because we switch the base type BT, but there could be some
5384 -- private dependent subtypes of BT which remain unswitched. Such
5385 -- subtypes might need to be switched at a later point (see specific
5386 -- provision for that case in Switch_View).
5388 elsif not Is_Private_Type
(T
)
5389 and then not Has_Private_View
(N
)
5390 and then Is_Private_Type
(BT
)
5391 and then Present
(Full_View
(BT
))
5392 and then not Is_Generic_Type
(BT
)
5393 and then not In_Open_Scopes
(BT
)
5395 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
5396 Exchange_Declarations
(BT
);
5399 end Check_Private_View
;
5401 --------------------------
5402 -- Contains_Instance_Of --
5403 --------------------------
5405 function Contains_Instance_Of
5408 N
: Node_Id
) return Boolean
5416 -- Verify that there are no circular instantiations. We check whether
5417 -- the unit contains an instance of the current scope or some enclosing
5418 -- scope (in case one of the instances appears in a subunit). Longer
5419 -- circularities involving subunits might seem too pathological to
5420 -- consider, but they were not too pathological for the authors of
5421 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5422 -- enclosing generic scopes as containing an instance.
5425 -- Within a generic subprogram body, the scope is not generic, to
5426 -- allow for recursive subprograms. Use the declaration to determine
5427 -- whether this is a generic unit.
5429 if Ekind
(Scop
) = E_Generic_Package
5430 or else (Is_Subprogram
(Scop
)
5431 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
5432 N_Generic_Subprogram_Declaration
)
5434 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
5436 while Present
(Elmt
) loop
5437 if Node
(Elmt
) = Scop
then
5438 Error_Msg_Node_2
:= Inner
;
5440 ("circular Instantiation: & instantiated within &!",
5444 elsif Node
(Elmt
) = Inner
then
5447 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
5448 Error_Msg_Node_2
:= Inner
;
5450 ("circular Instantiation: & instantiated within &!",
5458 -- Indicate that Inner is being instantiated within Scop
5460 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
5463 if Scop
= Standard_Standard
then
5466 Scop
:= Scope
(Scop
);
5471 end Contains_Instance_Of
;
5473 -----------------------
5474 -- Copy_Generic_Node --
5475 -----------------------
5477 function Copy_Generic_Node
5479 Parent_Id
: Node_Id
;
5480 Instantiating
: Boolean) return Node_Id
5485 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
5486 -- Check the given value of one of the Fields referenced by the
5487 -- current node to determine whether to copy it recursively. The
5488 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5489 -- value (Sloc, Uint, Char) in which case it need not be copied.
5491 procedure Copy_Descendants
;
5492 -- Common utility for various nodes
5494 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
5495 -- Make copy of element list
5497 function Copy_Generic_List
5499 Parent_Id
: Node_Id
) return List_Id
;
5500 -- Apply Copy_Node recursively to the members of a node list
5502 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
5503 -- True if an identifier is part of the defining program unit name
5504 -- of a child unit. The entity of such an identifier must be kept
5505 -- (for ASIS use) even though as the name of an enclosing generic
5506 -- it would otherwise not be preserved in the generic tree.
5508 ----------------------
5509 -- Copy_Descendants --
5510 ----------------------
5512 procedure Copy_Descendants
is
5514 use Atree
.Unchecked_Access
;
5515 -- This code section is part of the implementation of an untyped
5516 -- tree traversal, so it needs direct access to node fields.
5519 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5520 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5521 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5522 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
5523 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5524 end Copy_Descendants
;
5526 -----------------------------
5527 -- Copy_Generic_Descendant --
5528 -----------------------------
5530 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
5532 if D
= Union_Id
(Empty
) then
5535 elsif D
in Node_Range
then
5537 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
5539 elsif D
in List_Range
then
5540 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
5542 elsif D
in Elist_Range
then
5543 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
5545 -- Nothing else is copyable (e.g. Uint values), return as is
5550 end Copy_Generic_Descendant
;
5552 ------------------------
5553 -- Copy_Generic_Elist --
5554 ------------------------
5556 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
5563 M
:= First_Elmt
(E
);
5564 while Present
(M
) loop
5566 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
5575 end Copy_Generic_Elist
;
5577 -----------------------
5578 -- Copy_Generic_List --
5579 -----------------------
5581 function Copy_Generic_List
5583 Parent_Id
: Node_Id
) return List_Id
5591 Set_Parent
(New_L
, Parent_Id
);
5594 while Present
(N
) loop
5595 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
5604 end Copy_Generic_List
;
5606 ---------------------------
5607 -- In_Defining_Unit_Name --
5608 ---------------------------
5610 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
5612 return Present
(Parent
(Nam
))
5613 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
5615 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
5616 and then In_Defining_Unit_Name
(Parent
(Nam
))));
5617 end In_Defining_Unit_Name
;
5619 -- Start of processing for Copy_Generic_Node
5626 New_N
:= New_Copy
(N
);
5628 if Instantiating
then
5629 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
5632 if not Is_List_Member
(N
) then
5633 Set_Parent
(New_N
, Parent_Id
);
5636 -- If defining identifier, then all fields have been copied already
5638 if Nkind
(New_N
) in N_Entity
then
5641 -- Special casing for identifiers and other entity names and operators
5643 elsif Nkind_In
(New_N
, N_Identifier
,
5644 N_Character_Literal
,
5647 or else Nkind
(New_N
) in N_Op
5649 if not Instantiating
then
5651 -- Link both nodes in order to assign subsequently the
5652 -- entity of the copy to the original node, in case this
5653 -- is a global reference.
5655 Set_Associated_Node
(N
, New_N
);
5657 -- If we are within an instantiation, this is a nested generic
5658 -- that has already been analyzed at the point of definition. We
5659 -- must preserve references that were global to the enclosing
5660 -- parent at that point. Other occurrences, whether global or
5661 -- local to the current generic, must be resolved anew, so we
5662 -- reset the entity in the generic copy. A global reference has a
5663 -- smaller depth than the parent, or else the same depth in case
5664 -- both are distinct compilation units.
5665 -- A child unit is implicitly declared within the enclosing parent
5666 -- but is in fact global to it, and must be preserved.
5668 -- It is also possible for Current_Instantiated_Parent to be
5669 -- defined, and for this not to be a nested generic, namely if the
5670 -- unit is loaded through Rtsfind. In that case, the entity of
5671 -- New_N is only a link to the associated node, and not a defining
5674 -- The entities for parent units in the defining_program_unit of a
5675 -- generic child unit are established when the context of the unit
5676 -- is first analyzed, before the generic copy is made. They are
5677 -- preserved in the copy for use in ASIS queries.
5679 Ent
:= Entity
(New_N
);
5681 if No
(Current_Instantiated_Parent
.Gen_Id
) then
5683 or else Nkind
(Ent
) /= N_Defining_Identifier
5684 or else not In_Defining_Unit_Name
(N
)
5686 Set_Associated_Node
(New_N
, Empty
);
5691 not Nkind_In
(Ent
, N_Defining_Identifier
,
5692 N_Defining_Character_Literal
,
5693 N_Defining_Operator_Symbol
)
5694 or else No
(Scope
(Ent
))
5696 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
5697 and then not Is_Child_Unit
(Ent
))
5699 (Scope_Depth
(Scope
(Ent
)) >
5700 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
5702 Get_Source_Unit
(Ent
) =
5703 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
5705 Set_Associated_Node
(New_N
, Empty
);
5708 -- Case of instantiating identifier or some other name or operator
5711 -- If the associated node is still defined, the entity in it is
5712 -- global, and must be copied to the instance. If this copy is
5713 -- being made for a body to inline, it is applied to an
5714 -- instantiated tree, and the entity is already present and must
5715 -- be also preserved.
5718 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
5721 if Present
(Assoc
) then
5722 if Nkind
(Assoc
) = Nkind
(N
) then
5723 Set_Entity
(New_N
, Entity
(Assoc
));
5724 Check_Private_View
(N
);
5726 elsif Nkind
(Assoc
) = N_Function_Call
then
5727 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
5729 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
5730 N_Defining_Character_Literal
,
5731 N_Defining_Operator_Symbol
)
5732 and then Expander_Active
5734 -- Inlining case: we are copying a tree that contains
5735 -- global entities, which are preserved in the copy to be
5736 -- used for subsequent inlining.
5741 Set_Entity
(New_N
, Empty
);
5747 -- For expanded name, we must copy the Prefix and Selector_Name
5749 if Nkind
(N
) = N_Expanded_Name
then
5751 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
5753 Set_Selector_Name
(New_N
,
5754 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
5756 -- For operators, we must copy the right operand
5758 elsif Nkind
(N
) in N_Op
then
5759 Set_Right_Opnd
(New_N
,
5760 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
5762 -- And for binary operators, the left operand as well
5764 if Nkind
(N
) in N_Binary_Op
then
5765 Set_Left_Opnd
(New_N
,
5766 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
5770 -- Special casing for stubs
5772 elsif Nkind
(N
) in N_Body_Stub
then
5774 -- In any case, we must copy the specification or defining
5775 -- identifier as appropriate.
5777 if Nkind
(N
) = N_Subprogram_Body_Stub
then
5778 Set_Specification
(New_N
,
5779 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
5782 Set_Defining_Identifier
(New_N
,
5784 (Defining_Identifier
(N
), New_N
, Instantiating
));
5787 -- If we are not instantiating, then this is where we load and
5788 -- analyze subunits, i.e. at the point where the stub occurs. A
5789 -- more permissible system might defer this analysis to the point
5790 -- of instantiation, but this seems to complicated for now.
5792 if not Instantiating
then
5794 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
5796 Unum
: Unit_Number_Type
;
5802 (Load_Name
=> Subunit_Name
,
5807 -- If the proper body is not found, a warning message will be
5808 -- emitted when analyzing the stub, or later at the point
5809 -- of instantiation. Here we just leave the stub as is.
5811 if Unum
= No_Unit
then
5812 Subunits_Missing
:= True;
5813 goto Subunit_Not_Found
;
5816 Subunit
:= Cunit
(Unum
);
5818 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
5820 ("found child unit instead of expected SEPARATE subunit",
5822 Error_Msg_Sloc
:= Sloc
(N
);
5823 Error_Msg_N
("\to complete stub #", Subunit
);
5824 goto Subunit_Not_Found
;
5827 -- We must create a generic copy of the subunit, in order to
5828 -- perform semantic analysis on it, and we must replace the
5829 -- stub in the original generic unit with the subunit, in order
5830 -- to preserve non-local references within.
5832 -- Only the proper body needs to be copied. Library_Unit and
5833 -- context clause are simply inherited by the generic copy.
5834 -- Note that the copy (which may be recursive if there are
5835 -- nested subunits) must be done first, before attaching it to
5836 -- the enclosing generic.
5840 (Proper_Body
(Unit
(Subunit
)),
5841 Empty
, Instantiating
=> False);
5843 -- Now place the original proper body in the original generic
5844 -- unit. This is a body, not a compilation unit.
5846 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
5847 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
5848 Set_Was_Originally_Stub
(N
);
5850 -- Finally replace the body of the subunit with its copy, and
5851 -- make this new subunit into the library unit of the generic
5852 -- copy, which does not have stubs any longer.
5854 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
5855 Set_Library_Unit
(New_N
, Subunit
);
5856 Inherit_Context
(Unit
(Subunit
), N
);
5859 -- If we are instantiating, this must be an error case, since
5860 -- otherwise we would have replaced the stub node by the proper body
5861 -- that corresponds. So just ignore it in the copy (i.e. we have
5862 -- copied it, and that is good enough).
5868 <<Subunit_Not_Found
>> null;
5870 -- If the node is a compilation unit, it is the subunit of a stub, which
5871 -- has been loaded already (see code below). In this case, the library
5872 -- unit field of N points to the parent unit (which is a compilation
5873 -- unit) and need not (and cannot!) be copied.
5875 -- When the proper body of the stub is analyzed, the library_unit link
5876 -- is used to establish the proper context (see sem_ch10).
5878 -- The other fields of a compilation unit are copied as usual
5880 elsif Nkind
(N
) = N_Compilation_Unit
then
5882 -- This code can only be executed when not instantiating, because in
5883 -- the copy made for an instantiation, the compilation unit node has
5884 -- disappeared at the point that a stub is replaced by its proper
5887 pragma Assert
(not Instantiating
);
5889 Set_Context_Items
(New_N
,
5890 Copy_Generic_List
(Context_Items
(N
), New_N
));
5893 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5895 Set_First_Inlined_Subprogram
(New_N
,
5897 (First_Inlined_Subprogram
(N
), New_N
, False));
5899 Set_Aux_Decls_Node
(New_N
,
5900 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5902 -- For an assignment node, the assignment is known to be semantically
5903 -- legal if we are instantiating the template. This avoids incorrect
5904 -- diagnostics in generated code.
5906 elsif Nkind
(N
) = N_Assignment_Statement
then
5908 -- Copy name and expression fields in usual manner
5911 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5913 Set_Expression
(New_N
,
5914 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5916 if Instantiating
then
5917 Set_Assignment_OK
(Name
(New_N
), True);
5920 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
5921 if not Instantiating
then
5922 Set_Associated_Node
(N
, New_N
);
5925 if Present
(Get_Associated_Node
(N
))
5926 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5928 -- In the generic the aggregate has some composite type. If at
5929 -- the point of instantiation the type has a private view,
5930 -- install the full view (and that of its ancestors, if any).
5933 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5938 and then Is_Private_Type
(T
)
5944 and then Is_Tagged_Type
(T
)
5945 and then Is_Derived_Type
(T
)
5947 Rt
:= Root_Type
(T
);
5952 if Is_Private_Type
(T
) then
5963 -- Do not copy the associated node, which points to
5964 -- the generic copy of the aggregate.
5967 use Atree
.Unchecked_Access
;
5968 -- This code section is part of the implementation of an untyped
5969 -- tree traversal, so it needs direct access to node fields.
5972 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5973 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5974 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5975 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5978 -- Allocators do not have an identifier denoting the access type,
5979 -- so we must locate it through the expression to check whether
5980 -- the views are consistent.
5982 elsif Nkind
(N
) = N_Allocator
5983 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5984 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5985 and then Instantiating
5988 T
: constant Node_Id
:=
5989 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5995 -- Retrieve the allocator node in the generic copy
5997 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5999 and then Is_Private_Type
(Acc_T
)
6001 Switch_View
(Acc_T
);
6008 -- For a proper body, we must catch the case of a proper body that
6009 -- replaces a stub. This represents the point at which a separate
6010 -- compilation unit, and hence template file, may be referenced, so we
6011 -- must make a new source instantiation entry for the template of the
6012 -- subunit, and ensure that all nodes in the subunit are adjusted using
6013 -- this new source instantiation entry.
6015 elsif Nkind
(N
) in N_Proper_Body
then
6017 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
6020 if Instantiating
and then Was_Originally_Stub
(N
) then
6021 Create_Instantiation_Source
6022 (Instantiation_Node
,
6023 Defining_Entity
(N
),
6028 -- Now copy the fields of the proper body, using the new
6029 -- adjustment factor if one was needed as per test above.
6033 -- Restore the original adjustment factor in case changed
6035 S_Adjustment
:= Save_Adjustment
;
6038 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6039 -- generic unit, not to the instantiating unit.
6041 elsif Nkind
(N
) = N_Pragma
6042 and then Instantiating
6045 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
6047 if Prag_Id
= Pragma_Ident
6048 or else Prag_Id
= Pragma_Comment
6050 New_N
:= Make_Null_Statement
(Sloc
(N
));
6056 elsif Nkind_In
(N
, N_Integer_Literal
,
6060 -- No descendant fields need traversing
6064 -- For the remaining nodes, copy recursively their descendants
6070 and then Nkind
(N
) = N_Subprogram_Body
6072 Set_Generic_Parent
(Specification
(New_N
), N
);
6077 end Copy_Generic_Node
;
6079 ----------------------------
6080 -- Denotes_Formal_Package --
6081 ----------------------------
6083 function Denotes_Formal_Package
6085 On_Exit
: Boolean := False) return Boolean
6088 Scop
: constant Entity_Id
:= Scope
(Pack
);
6095 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
6097 Par
:= Current_Instantiated_Parent
.Act_Id
;
6100 if Ekind
(Scop
) = E_Generic_Package
6101 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
6102 N_Generic_Subprogram_Declaration
6106 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
6107 N_Formal_Package_Declaration
6115 -- Check whether this package is associated with a formal package of
6116 -- the enclosing instantiation. Iterate over the list of renamings.
6118 E
:= First_Entity
(Par
);
6119 while Present
(E
) loop
6120 if Ekind
(E
) /= E_Package
6121 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
6125 elsif Renamed_Object
(E
) = Par
then
6128 elsif Renamed_Object
(E
) = Pack
then
6137 end Denotes_Formal_Package
;
6143 procedure End_Generic
is
6145 -- ??? More things could be factored out in this routine. Should
6146 -- probably be done at a later stage.
6148 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
6149 Generic_Flags
.Decrement_Last
;
6151 Expander_Mode_Restore
;
6154 ----------------------
6155 -- Find_Actual_Type --
6156 ----------------------
6158 function Find_Actual_Type
6160 Gen_Type
: Entity_Id
) return Entity_Id
6162 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
6166 -- Special processing only applies to child units
6168 if not Is_Child_Unit
(Gen_Scope
) then
6169 return Get_Instance_Of
(Typ
);
6171 -- If designated or component type is itself a formal of the child unit,
6172 -- its instance is available.
6174 elsif Scope
(Typ
) = Gen_Scope
then
6175 return Get_Instance_Of
(Typ
);
6177 -- If the array or access type is not declared in the parent unit,
6178 -- no special processing needed.
6180 elsif not Is_Generic_Type
(Typ
)
6181 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
6183 return Get_Instance_Of
(Typ
);
6185 -- Otherwise, retrieve designated or component type by visibility
6188 T
:= Current_Entity
(Typ
);
6189 while Present
(T
) loop
6190 if In_Open_Scopes
(Scope
(T
)) then
6193 elsif Is_Generic_Actual_Type
(T
) then
6202 end Find_Actual_Type
;
6204 ----------------------------
6205 -- Freeze_Subprogram_Body --
6206 ----------------------------
6208 procedure Freeze_Subprogram_Body
6209 (Inst_Node
: Node_Id
;
6211 Pack_Id
: Entity_Id
)
6214 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
6215 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
6220 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
6221 -- Yields True if N1 and N2 appear in the same compilation unit,
6222 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6223 -- traversal of the tree for the unit.
6225 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
6226 -- Find innermost package body that encloses the given node, and which
6227 -- is not a compilation unit. Freeze nodes for the instance, or for its
6228 -- enclosing body, may be inserted after the enclosing_body of the
6231 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
6232 -- Find entity for given package body, and locate or create a freeze
6235 function True_Parent
(N
: Node_Id
) return Node_Id
;
6236 -- For a subunit, return parent of corresponding stub
6242 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
6248 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
6249 -- Find distance from given node to enclosing compilation unit
6255 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
6258 and then Nkind
(P
) /= N_Compilation_Unit
6260 P
:= True_Parent
(P
);
6265 -- Start of processing for Earlier
6268 Find_Depth
(P1
, D1
);
6269 Find_Depth
(P2
, D2
);
6279 P1
:= True_Parent
(P1
);
6284 P2
:= True_Parent
(P2
);
6288 -- At this point P1 and P2 are at the same distance from the root.
6289 -- We examine their parents until we find a common declarative
6290 -- list, at which point we can establish their relative placement
6291 -- by comparing their ultimate slocs. If we reach the root,
6292 -- N1 and N2 do not descend from the same declarative list (e.g.
6293 -- one is nested in the declarative part and the other is in a block
6294 -- in the statement part) and the earlier one is already frozen.
6296 while not Is_List_Member
(P1
)
6297 or else not Is_List_Member
(P2
)
6298 or else List_Containing
(P1
) /= List_Containing
(P2
)
6300 P1
:= True_Parent
(P1
);
6301 P2
:= True_Parent
(P2
);
6303 if Nkind
(Parent
(P1
)) = N_Subunit
then
6304 P1
:= Corresponding_Stub
(Parent
(P1
));
6307 if Nkind
(Parent
(P2
)) = N_Subunit
then
6308 P2
:= Corresponding_Stub
(Parent
(P2
));
6317 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
6320 --------------------
6321 -- Enclosing_Body --
6322 --------------------
6324 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
6325 P
: Node_Id
:= Parent
(N
);
6329 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
6331 if Nkind
(P
) = N_Package_Body
then
6333 if Nkind
(Parent
(P
)) = N_Subunit
then
6334 return Corresponding_Stub
(Parent
(P
));
6340 P
:= True_Parent
(P
);
6346 -------------------------
6347 -- Package_Freeze_Node --
6348 -------------------------
6350 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
6354 if Nkind
(B
) = N_Package_Body
then
6355 Id
:= Corresponding_Spec
(B
);
6357 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
6358 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
6361 Ensure_Freeze_Node
(Id
);
6362 return Freeze_Node
(Id
);
6363 end Package_Freeze_Node
;
6369 function True_Parent
(N
: Node_Id
) return Node_Id
is
6371 if Nkind
(Parent
(N
)) = N_Subunit
then
6372 return Parent
(Corresponding_Stub
(Parent
(N
)));
6378 -- Start of processing of Freeze_Subprogram_Body
6381 -- If the instance and the generic body appear within the same unit, and
6382 -- the instance precedes the generic, the freeze node for the instance
6383 -- must appear after that of the generic. If the generic is nested
6384 -- within another instance I2, then current instance must be frozen
6385 -- after I2. In both cases, the freeze nodes are those of enclosing
6386 -- packages. Otherwise, the freeze node is placed at the end of the
6387 -- current declarative part.
6389 Enc_G
:= Enclosing_Body
(Gen_Body
);
6390 Enc_I
:= Enclosing_Body
(Inst_Node
);
6391 Ensure_Freeze_Node
(Pack_Id
);
6392 F_Node
:= Freeze_Node
(Pack_Id
);
6394 if Is_Generic_Instance
(Par
)
6395 and then Present
(Freeze_Node
(Par
))
6397 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
6399 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
6401 -- The parent was a premature instantiation. Insert freeze node at
6402 -- the end the current declarative part.
6404 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6407 Insert_After
(Freeze_Node
(Par
), F_Node
);
6410 -- The body enclosing the instance should be frozen after the body that
6411 -- includes the generic, because the body of the instance may make
6412 -- references to entities therein. If the two are not in the same
6413 -- declarative part, or if the one enclosing the instance is frozen
6414 -- already, freeze the instance at the end of the current declarative
6417 elsif Is_Generic_Instance
(Par
)
6418 and then Present
(Freeze_Node
(Par
))
6419 and then Present
(Enc_I
)
6421 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
6423 (Nkind
(Enc_I
) = N_Package_Body
6425 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
6427 -- The enclosing package may contain several instances. Rather
6428 -- than computing the earliest point at which to insert its
6429 -- freeze node, we place it at the end of the declarative part
6430 -- of the parent of the generic.
6432 Insert_After_Last_Decl
6433 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
6436 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6438 elsif Present
(Enc_G
)
6439 and then Present
(Enc_I
)
6440 and then Enc_G
/= Enc_I
6441 and then Earlier
(Inst_Node
, Gen_Body
)
6443 if Nkind
(Enc_G
) = N_Package_Body
then
6444 E_G_Id
:= Corresponding_Spec
(Enc_G
);
6445 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
6447 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
6450 -- Freeze package that encloses instance, and place node after
6451 -- package that encloses generic. If enclosing package is already
6452 -- frozen we have to assume it is at the proper place. This may be
6453 -- a potential ABE that requires dynamic checking. Do not add a
6454 -- freeze node if the package that encloses the generic is inside
6455 -- the body that encloses the instance, because the freeze node
6456 -- would be in the wrong scope. Additional contortions needed if
6457 -- the bodies are within a subunit.
6460 Enclosing_Body
: Node_Id
;
6463 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
6464 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
6466 Enclosing_Body
:= Enc_I
;
6469 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
6470 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
6474 -- Freeze enclosing subunit before instance
6476 Ensure_Freeze_Node
(E_G_Id
);
6478 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
6479 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
6482 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6485 -- If none of the above, insert freeze node at the end of the current
6486 -- declarative part.
6488 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6490 end Freeze_Subprogram_Body
;
6496 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
6498 return Generic_Renamings
.Table
(E
).Gen_Id
;
6501 ---------------------
6502 -- Get_Instance_Of --
6503 ---------------------
6505 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
6506 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
6509 if Res
/= Assoc_Null
then
6510 return Generic_Renamings
.Table
(Res
).Act_Id
;
6512 -- On exit, entity is not instantiated: not a generic parameter, or
6513 -- else parameter of an inner generic unit.
6517 end Get_Instance_Of
;
6519 ------------------------------------
6520 -- Get_Package_Instantiation_Node --
6521 ------------------------------------
6523 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
6524 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
6528 -- If the Package_Instantiation attribute has been set on the package
6529 -- entity, then use it directly when it (or its Original_Node) refers
6530 -- to an N_Package_Instantiation node. In principle it should be
6531 -- possible to have this field set in all cases, which should be
6532 -- investigated, and would allow this function to be significantly
6535 if Present
(Package_Instantiation
(A
)) then
6536 if Nkind
(Package_Instantiation
(A
)) = N_Package_Instantiation
then
6537 return Package_Instantiation
(A
);
6539 elsif Nkind
(Original_Node
(Package_Instantiation
(A
))) =
6540 N_Package_Instantiation
6542 return Original_Node
(Package_Instantiation
(A
));
6546 -- If the instantiation is a compilation unit that does not need body
6547 -- then the instantiation node has been rewritten as a package
6548 -- declaration for the instance, and we return the original node.
6550 -- If it is a compilation unit and the instance node has not been
6551 -- rewritten, then it is still the unit of the compilation. Finally, if
6552 -- a body is present, this is a parent of the main unit whose body has
6553 -- been compiled for inlining purposes, and the instantiation node has
6554 -- been rewritten with the instance body.
6556 -- Otherwise the instantiation node appears after the declaration. If
6557 -- the entity is a formal package, the declaration may have been
6558 -- rewritten as a generic declaration (in the case of a formal with box)
6559 -- or left as a formal package declaration if it has actuals, and is
6560 -- found with a forward search.
6562 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
6563 if Nkind
(Decl
) = N_Package_Declaration
6564 and then Present
(Corresponding_Body
(Decl
))
6566 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
6569 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
6570 return Original_Node
(Decl
);
6572 return Unit
(Parent
(Decl
));
6575 elsif Nkind
(Decl
) = N_Package_Declaration
6576 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
6578 return Original_Node
(Decl
);
6581 Inst
:= Next
(Decl
);
6582 while not Nkind_In
(Inst
, N_Package_Instantiation
,
6583 N_Formal_Package_Declaration
)
6590 end Get_Package_Instantiation_Node
;
6592 ------------------------
6593 -- Has_Been_Exchanged --
6594 ------------------------
6596 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
6600 Next
:= First_Elmt
(Exchanged_Views
);
6601 while Present
(Next
) loop
6602 if Full_View
(Node
(Next
)) = E
then
6610 end Has_Been_Exchanged
;
6616 function Hash
(F
: Entity_Id
) return HTable_Range
is
6618 return HTable_Range
(F
mod HTable_Size
);
6621 ------------------------
6622 -- Hide_Current_Scope --
6623 ------------------------
6625 procedure Hide_Current_Scope
is
6626 C
: constant Entity_Id
:= Current_Scope
;
6630 Set_Is_Hidden_Open_Scope
(C
);
6632 E
:= First_Entity
(C
);
6633 while Present
(E
) loop
6634 if Is_Immediately_Visible
(E
) then
6635 Set_Is_Immediately_Visible
(E
, False);
6636 Append_Elmt
(E
, Hidden_Entities
);
6642 -- Make the scope name invisible as well. This is necessary, but might
6643 -- conflict with calls to Rtsfind later on, in case the scope is a
6644 -- predefined one. There is no clean solution to this problem, so for
6645 -- now we depend on the user not redefining Standard itself in one of
6646 -- the parent units.
6648 if Is_Immediately_Visible
(C
)
6649 and then C
/= Standard_Standard
6651 Set_Is_Immediately_Visible
(C
, False);
6652 Append_Elmt
(C
, Hidden_Entities
);
6655 end Hide_Current_Scope
;
6661 procedure Init_Env
is
6662 Saved
: Instance_Env
;
6665 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
6666 Saved
.Exchanged_Views
:= Exchanged_Views
;
6667 Saved
.Hidden_Entities
:= Hidden_Entities
;
6668 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
6669 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
6670 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
6672 -- Save configuration switches. These may be reset if the unit is a
6673 -- predefined unit, and the current mode is not Ada 2005.
6675 Save_Opt_Config_Switches
(Saved
.Switches
);
6677 Instance_Envs
.Append
(Saved
);
6679 Exchanged_Views
:= New_Elmt_List
;
6680 Hidden_Entities
:= New_Elmt_List
;
6682 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6683 -- this is set properly in Set_Instance_Env.
6685 Current_Instantiated_Parent
:=
6686 (Current_Scope
, Current_Scope
, Assoc_Null
);
6689 ------------------------------
6690 -- In_Same_Declarative_Part --
6691 ------------------------------
6693 function In_Same_Declarative_Part
6695 Inst
: Node_Id
) return Boolean
6697 Decls
: constant Node_Id
:= Parent
(F_Node
);
6698 Nod
: Node_Id
:= Parent
(Inst
);
6701 while Present
(Nod
) loop
6705 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
6713 elsif Nkind
(Nod
) = N_Subunit
then
6714 Nod
:= Corresponding_Stub
(Nod
);
6716 elsif Nkind
(Nod
) = N_Compilation_Unit
then
6720 Nod
:= Parent
(Nod
);
6725 end In_Same_Declarative_Part
;
6727 ---------------------
6728 -- In_Main_Context --
6729 ---------------------
6731 function In_Main_Context
(E
: Entity_Id
) return Boolean is
6737 if not Is_Compilation_Unit
(E
)
6738 or else Ekind
(E
) /= E_Package
6739 or else In_Private_Part
(E
)
6744 Context
:= Context_Items
(Cunit
(Main_Unit
));
6746 Clause
:= First
(Context
);
6747 while Present
(Clause
) loop
6748 if Nkind
(Clause
) = N_With_Clause
then
6749 Nam
:= Name
(Clause
);
6751 -- If the current scope is part of the context of the main unit,
6752 -- analysis of the corresponding with_clause is not complete, and
6753 -- the entity is not set. We use the Chars field directly, which
6754 -- might produce false positives in rare cases, but guarantees
6755 -- that we produce all the instance bodies we will need.
6757 if (Is_Entity_Name
(Nam
)
6758 and then Chars
(Nam
) = Chars
(E
))
6759 or else (Nkind
(Nam
) = N_Selected_Component
6760 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
6770 end In_Main_Context
;
6772 ---------------------
6773 -- Inherit_Context --
6774 ---------------------
6776 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
6777 Current_Context
: List_Id
;
6778 Current_Unit
: Node_Id
;
6783 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
6785 -- The inherited context is attached to the enclosing compilation
6786 -- unit. This is either the main unit, or the declaration for the
6787 -- main unit (in case the instantiation appears within the package
6788 -- declaration and the main unit is its body).
6790 Current_Unit
:= Parent
(Inst
);
6791 while Present
(Current_Unit
)
6792 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
6794 Current_Unit
:= Parent
(Current_Unit
);
6797 Current_Context
:= Context_Items
(Current_Unit
);
6799 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
6800 while Present
(Item
) loop
6801 if Nkind
(Item
) = N_With_Clause
then
6802 New_I
:= New_Copy
(Item
);
6803 Set_Implicit_With
(New_I
, True);
6804 Append
(New_I
, Current_Context
);
6810 end Inherit_Context
;
6816 procedure Initialize
is
6818 Generic_Renamings
.Init
;
6821 Generic_Renamings_HTable
.Reset
;
6822 Circularity_Detected
:= False;
6823 Exchanged_Views
:= No_Elist
;
6824 Hidden_Entities
:= No_Elist
;
6827 ----------------------------
6828 -- Insert_After_Last_Decl --
6829 ----------------------------
6831 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
6832 L
: List_Id
:= List_Containing
(N
);
6833 P
: constant Node_Id
:= Parent
(L
);
6836 if not Is_List_Member
(F_Node
) then
6837 if Nkind
(P
) = N_Package_Specification
6838 and then L
= Visible_Declarations
(P
)
6839 and then Present
(Private_Declarations
(P
))
6840 and then not Is_Empty_List
(Private_Declarations
(P
))
6842 L
:= Private_Declarations
(P
);
6845 Insert_After
(Last
(L
), F_Node
);
6847 end Insert_After_Last_Decl
;
6853 procedure Install_Body
6854 (Act_Body
: Node_Id
;
6859 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
6860 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
6861 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
6862 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
6863 Gen_Unit
: constant Node_Id
:=
6864 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
6865 Orig_Body
: Node_Id
:= Gen_Body
;
6867 Body_Unit
: Node_Id
;
6869 Must_Delay
: Boolean;
6871 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
6872 -- Find subprogram (if any) that encloses instance and/or generic body
6874 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
6875 -- If the instance is nested inside a generic unit, the Sloc of the
6876 -- instance indicates the place of the original definition, not the
6877 -- point of the current enclosing instance. Pending a better usage of
6878 -- Slocs to indicate instantiation places, we determine the place of
6879 -- origin of a node by finding the maximum sloc of any ancestor node.
6880 -- Why is this not equivalent to Top_Level_Location ???
6882 --------------------
6883 -- Enclosing_Subp --
6884 --------------------
6886 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
6887 Scop
: Entity_Id
:= Scope
(Id
);
6890 while Scop
/= Standard_Standard
6891 and then not Is_Overloadable
(Scop
)
6893 Scop
:= Scope
(Scop
);
6903 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
6910 while Present
(N1
) and then N1
/= Act_Unit
loop
6911 if Sloc
(N1
) > Res
then
6921 -- Start of processing for Install_Body
6925 -- If the body is a subunit, the freeze point is the corresponding
6926 -- stub in the current compilation, not the subunit itself.
6928 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
6929 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6931 Orig_Body
:= Gen_Body
;
6934 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6936 -- If the instantiation and the generic definition appear in the same
6937 -- package declaration, this is an early instantiation. If they appear
6938 -- in the same declarative part, it is an early instantiation only if
6939 -- the generic body appears textually later, and the generic body is
6940 -- also in the main unit.
6942 -- If instance is nested within a subprogram, and the generic body is
6943 -- not, the instance is delayed because the enclosing body is. If
6944 -- instance and body are within the same scope, or the same sub-
6945 -- program body, indicate explicitly that the instance is delayed.
6948 (Gen_Unit
= Act_Unit
6949 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
6950 N_Generic_Package_Declaration
)
6951 or else (Gen_Unit
= Body_Unit
6952 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6953 and then Is_In_Main_Unit
(Gen_Unit
)
6954 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6956 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6958 -- If this is an early instantiation, the freeze node is placed after
6959 -- the generic body. Otherwise, if the generic appears in an instance,
6960 -- we cannot freeze the current instance until the outer one is frozen.
6961 -- This is only relevant if the current instance is nested within some
6962 -- inner scope not itself within the outer instance. If this scope is
6963 -- a package body in the same declarative part as the outer instance,
6964 -- then that body needs to be frozen after the outer instance. Finally,
6965 -- if no delay is needed, we place the freeze node at the end of the
6966 -- current declarative part.
6968 if Expander_Active
then
6969 Ensure_Freeze_Node
(Act_Id
);
6970 F_Node
:= Freeze_Node
(Act_Id
);
6973 Insert_After
(Orig_Body
, F_Node
);
6975 elsif Is_Generic_Instance
(Par
)
6976 and then Present
(Freeze_Node
(Par
))
6977 and then Scope
(Act_Id
) /= Par
6979 -- Freeze instance of inner generic after instance of enclosing
6982 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
6983 Insert_After
(Freeze_Node
(Par
), F_Node
);
6985 -- Freeze package enclosing instance of inner generic after
6986 -- instance of enclosing generic.
6988 elsif Nkind
(Parent
(N
)) = N_Package_Body
6989 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
6993 Enclosing
: constant Entity_Id
:=
6994 Corresponding_Spec
(Parent
(N
));
6997 Insert_After_Last_Decl
(N
, F_Node
);
6998 Ensure_Freeze_Node
(Enclosing
);
7000 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
7001 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
7006 Insert_After_Last_Decl
(N
, F_Node
);
7010 Insert_After_Last_Decl
(N
, F_Node
);
7014 Set_Is_Frozen
(Act_Id
);
7015 Insert_Before
(N
, Act_Body
);
7016 Mark_Rewrite_Insertion
(Act_Body
);
7019 -----------------------------
7020 -- Install_Formal_Packages --
7021 -----------------------------
7023 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
7027 E
:= First_Entity
(Par
);
7028 while Present
(E
) loop
7029 if Ekind
(E
) = E_Package
7030 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
7032 -- If this is the renaming for the parent instance, done
7034 if Renamed_Object
(E
) = Par
then
7037 -- The visibility of a formal of an enclosing generic is
7040 elsif Denotes_Formal_Package
(E
) then
7043 elsif Present
(Associated_Formal_Package
(E
))
7044 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
7046 Check_Generic_Actuals
(Renamed_Object
(E
), True);
7047 Set_Is_Hidden
(E
, False);
7053 end Install_Formal_Packages
;
7055 --------------------
7056 -- Install_Parent --
7057 --------------------
7059 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
7060 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
7061 S
: constant Entity_Id
:= Current_Scope
;
7062 Inst_Par
: Entity_Id
;
7063 First_Par
: Entity_Id
;
7064 Inst_Node
: Node_Id
;
7065 Gen_Par
: Entity_Id
;
7066 First_Gen
: Entity_Id
;
7069 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
7070 -- Install the scopes of noninstance parent units ending with Par
7072 procedure Install_Spec
(Par
: Entity_Id
);
7073 -- The child unit is within the declarative part of the parent, so
7074 -- the declarations within the parent are immediately visible.
7076 -------------------------------
7077 -- Install_Noninstance_Specs --
7078 -------------------------------
7080 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
7083 and then Par
/= Standard_Standard
7084 and then not In_Open_Scopes
(Par
)
7086 Install_Noninstance_Specs
(Scope
(Par
));
7089 end Install_Noninstance_Specs
;
7095 procedure Install_Spec
(Par
: Entity_Id
) is
7096 Spec
: constant Node_Id
:=
7097 Specification
(Unit_Declaration_Node
(Par
));
7100 -- If this parent of the child instance is a top-level unit,
7101 -- then record the unit and its visibility for later resetting
7102 -- in Remove_Parent. We exclude units that are generic instances,
7103 -- as we only want to record this information for the ultimate
7104 -- top-level noninstance parent (is that always correct???).
7106 if Scope
(Par
) = Standard_Standard
7107 and then not Is_Generic_Instance
(Par
)
7109 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
7110 Instance_Parent_Unit
:= Par
;
7113 -- Open the parent scope and make it and its declarations visible.
7114 -- If this point is not within a body, then only the visible
7115 -- declarations should be made visible, and installation of the
7116 -- private declarations is deferred until the appropriate point
7117 -- within analysis of the spec being instantiated (see the handling
7118 -- of parent visibility in Analyze_Package_Specification). This is
7119 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7120 -- private view problems that occur when compiling instantiations of
7121 -- a generic child of that package (Generic_Dispatching_Constructor).
7122 -- If the instance freezes a tagged type, inlinings of operations
7123 -- from Ada.Tags may need the full view of type Tag. If inlining took
7124 -- proper account of establishing visibility of inlined subprograms'
7125 -- parents then it should be possible to remove this
7126 -- special check. ???
7129 Set_Is_Immediately_Visible
(Par
);
7130 Install_Visible_Declarations
(Par
);
7131 Set_Use
(Visible_Declarations
(Spec
));
7133 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
7134 Install_Private_Declarations
(Par
);
7135 Set_Use
(Private_Declarations
(Spec
));
7139 -- Start of processing for Install_Parent
7142 -- We need to install the parent instance to compile the instantiation
7143 -- of the child, but the child instance must appear in the current
7144 -- scope. Given that we cannot place the parent above the current scope
7145 -- in the scope stack, we duplicate the current scope and unstack both
7146 -- after the instantiation is complete.
7148 -- If the parent is itself the instantiation of a child unit, we must
7149 -- also stack the instantiation of its parent, and so on. Each such
7150 -- ancestor is the prefix of the name in a prior instantiation.
7152 -- If this is a nested instance, the parent unit itself resolves to
7153 -- a renaming of the parent instance, whose declaration we need.
7155 -- Finally, the parent may be a generic (not an instance) when the
7156 -- child unit appears as a formal package.
7160 if Present
(Renamed_Entity
(Inst_Par
)) then
7161 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7164 First_Par
:= Inst_Par
;
7167 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
7169 First_Gen
:= Gen_Par
;
7171 while Present
(Gen_Par
)
7172 and then Is_Child_Unit
(Gen_Par
)
7174 -- Load grandparent instance as well
7176 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
7178 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
7179 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
7181 if Present
(Renamed_Entity
(Inst_Par
)) then
7182 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7187 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
7189 if Present
(Gen_Par
) then
7190 Prepend_Elmt
(Inst_Par
, Ancestors
);
7193 -- Parent is not the name of an instantiation
7195 Install_Noninstance_Specs
(Inst_Par
);
7207 if Present
(First_Gen
) then
7208 Append_Elmt
(First_Par
, Ancestors
);
7211 Install_Noninstance_Specs
(First_Par
);
7214 if not Is_Empty_Elmt_List
(Ancestors
) then
7215 Elmt
:= First_Elmt
(Ancestors
);
7217 while Present
(Elmt
) loop
7218 Install_Spec
(Node
(Elmt
));
7219 Install_Formal_Packages
(Node
(Elmt
));
7230 --------------------------------
7231 -- Instantiate_Formal_Package --
7232 --------------------------------
7234 function Instantiate_Formal_Package
7237 Analyzed_Formal
: Node_Id
) return List_Id
7239 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7240 Actual_Pack
: Entity_Id
;
7241 Formal_Pack
: Entity_Id
;
7242 Gen_Parent
: Entity_Id
;
7245 Parent_Spec
: Node_Id
;
7247 procedure Find_Matching_Actual
7249 Act
: in out Entity_Id
);
7250 -- We need to associate each formal entity in the formal package
7251 -- with the corresponding entity in the actual package. The actual
7252 -- package has been analyzed and possibly expanded, and as a result
7253 -- there is no one-to-one correspondence between the two lists (for
7254 -- example, the actual may include subtypes, itypes, and inherited
7255 -- primitive operations, interspersed among the renaming declarations
7256 -- for the actuals) . We retrieve the corresponding actual by name
7257 -- because each actual has the same name as the formal, and they do
7258 -- appear in the same order.
7260 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
7261 -- Retrieve entity of defining entity of generic formal parameter.
7262 -- Only the declarations of formals need to be considered when
7263 -- linking them to actuals, but the declarative list may include
7264 -- internal entities generated during analysis, and those are ignored.
7266 procedure Match_Formal_Entity
7267 (Formal_Node
: Node_Id
;
7268 Formal_Ent
: Entity_Id
;
7269 Actual_Ent
: Entity_Id
);
7270 -- Associates the formal entity with the actual. In the case
7271 -- where Formal_Ent is a formal package, this procedure iterates
7272 -- through all of its formals and enters associations between the
7273 -- actuals occurring in the formal package's corresponding actual
7274 -- package (given by Actual_Ent) and the formal package's formal
7275 -- parameters. This procedure recurses if any of the parameters is
7276 -- itself a package.
7278 function Is_Instance_Of
7279 (Act_Spec
: Entity_Id
;
7280 Gen_Anc
: Entity_Id
) return Boolean;
7281 -- The actual can be an instantiation of a generic within another
7282 -- instance, in which case there is no direct link from it to the
7283 -- original generic ancestor. In that case, we recognize that the
7284 -- ultimate ancestor is the same by examining names and scopes.
7286 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
7287 -- Within the generic part, entities in the formal package are
7288 -- visible. To validate subsequent type declarations, indicate
7289 -- the correspondence between the entities in the analyzed formal,
7290 -- and the entities in the actual package. There are three packages
7291 -- involved in the instantiation of a formal package: the parent
7292 -- generic P1 which appears in the generic declaration, the fake
7293 -- instantiation P2 which appears in the analyzed generic, and whose
7294 -- visible entities may be used in subsequent formals, and the actual
7295 -- P3 in the instance. To validate subsequent formals, me indicate
7296 -- that the entities in P2 are mapped into those of P3. The mapping of
7297 -- entities has to be done recursively for nested packages.
7299 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
7300 -- If the current formal is declared with a box, its own formals are
7301 -- visible in the instance, as they were in the generic, and their
7302 -- Hidden flag must be reset. If some of these formals are themselves
7303 -- packages declared with a box, the processing must be recursive.
7305 --------------------------
7306 -- Find_Matching_Actual --
7307 --------------------------
7309 procedure Find_Matching_Actual
7311 Act
: in out Entity_Id
)
7313 Formal_Ent
: Entity_Id
;
7316 case Nkind
(Original_Node
(F
)) is
7317 when N_Formal_Object_Declaration |
7318 N_Formal_Type_Declaration
=>
7319 Formal_Ent
:= Defining_Identifier
(F
);
7321 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7325 when N_Formal_Subprogram_Declaration |
7326 N_Formal_Package_Declaration |
7327 N_Package_Declaration |
7328 N_Generic_Package_Declaration
=>
7329 Formal_Ent
:= Defining_Entity
(F
);
7331 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7336 raise Program_Error
;
7338 end Find_Matching_Actual
;
7340 -------------------------
7341 -- Match_Formal_Entity --
7342 -------------------------
7344 procedure Match_Formal_Entity
7345 (Formal_Node
: Node_Id
;
7346 Formal_Ent
: Entity_Id
;
7347 Actual_Ent
: Entity_Id
)
7349 Act_Pkg
: Entity_Id
;
7352 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
7354 if Ekind
(Actual_Ent
) = E_Package
then
7356 -- Record associations for each parameter
7358 Act_Pkg
:= Actual_Ent
;
7361 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
7370 -- Retrieve the actual given in the formal package declaration
7372 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
7374 -- The actual in the formal package declaration may be a
7375 -- renamed generic package, in which case we want to retrieve
7376 -- the original generic in order to traverse its formal part.
7378 if Present
(Renamed_Entity
(Actual
)) then
7379 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
7381 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
7384 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
7386 if Present
(Formals
) then
7387 F_Node
:= First_Non_Pragma
(Formals
);
7392 while Present
(A_Ent
)
7393 and then Present
(F_Node
)
7394 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
7396 F_Ent
:= Get_Formal_Entity
(F_Node
);
7398 if Present
(F_Ent
) then
7400 -- This is a formal of the original package. Record
7401 -- association and recurse.
7403 Find_Matching_Actual
(F_Node
, A_Ent
);
7404 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
7405 Next_Entity
(A_Ent
);
7408 Next_Non_Pragma
(F_Node
);
7412 end Match_Formal_Entity
;
7414 -----------------------
7415 -- Get_Formal_Entity --
7416 -----------------------
7418 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
7419 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
7422 when N_Formal_Object_Declaration
=>
7423 return Defining_Identifier
(N
);
7425 when N_Formal_Type_Declaration
=>
7426 return Defining_Identifier
(N
);
7428 when N_Formal_Subprogram_Declaration
=>
7429 return Defining_Unit_Name
(Specification
(N
));
7431 when N_Formal_Package_Declaration
=>
7432 return Defining_Identifier
(Original_Node
(N
));
7434 when N_Generic_Package_Declaration
=>
7435 return Defining_Identifier
(Original_Node
(N
));
7437 -- All other declarations are introduced by semantic analysis and
7438 -- have no match in the actual.
7443 end Get_Formal_Entity
;
7445 --------------------
7446 -- Is_Instance_Of --
7447 --------------------
7449 function Is_Instance_Of
7450 (Act_Spec
: Entity_Id
;
7451 Gen_Anc
: Entity_Id
) return Boolean
7453 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
7456 if No
(Gen_Par
) then
7459 -- Simplest case: the generic parent of the actual is the formal
7461 elsif Gen_Par
= Gen_Anc
then
7464 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
7467 -- The actual may be obtained through several instantiations. Its
7468 -- scope must itself be an instance of a generic declared in the
7469 -- same scope as the formal. Any other case is detected above.
7471 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
7475 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
7483 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
7488 Set_Instance_Of
(Form
, Act
);
7490 -- Traverse formal and actual package to map the corresponding
7491 -- entities. We skip over internal entities that may be generated
7492 -- during semantic analysis, and find the matching entities by
7493 -- name, given that they must appear in the same order.
7495 E1
:= First_Entity
(Form
);
7496 E2
:= First_Entity
(Act
);
7498 and then E1
/= First_Private_Entity
(Form
)
7500 -- Could this test be a single condition???
7501 -- Seems like it could, and isn't FPE (Form) a constant anyway???
7503 if not Is_Internal
(E1
)
7504 and then Present
(Parent
(E1
))
7505 and then not Is_Class_Wide_Type
(E1
)
7506 and then not Is_Internal_Name
(Chars
(E1
))
7509 and then Chars
(E2
) /= Chars
(E1
)
7517 Set_Instance_Of
(E1
, E2
);
7520 and then Is_Tagged_Type
(E2
)
7523 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
7526 if Ekind
(E1
) = E_Package
7527 and then No
(Renamed_Object
(E1
))
7529 Map_Entities
(E1
, E2
);
7538 ---------------------------
7539 -- Process_Nested_Formal --
7540 ---------------------------
7542 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
7546 if Present
(Associated_Formal_Package
(Formal
))
7547 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
7549 Ent
:= First_Entity
(Formal
);
7550 while Present
(Ent
) loop
7551 Set_Is_Hidden
(Ent
, False);
7552 Set_Is_Visible_Formal
(Ent
);
7553 Set_Is_Potentially_Use_Visible
7554 (Ent
, Is_Potentially_Use_Visible
(Formal
));
7556 if Ekind
(Ent
) = E_Package
then
7557 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
7558 Process_Nested_Formal
(Ent
);
7564 end Process_Nested_Formal
;
7566 -- Start of processing for Instantiate_Formal_Package
7571 if not Is_Entity_Name
(Actual
)
7572 or else Ekind
(Entity
(Actual
)) /= E_Package
7575 ("expect package instance to instantiate formal", Actual
);
7576 Abandon_Instantiation
(Actual
);
7577 raise Program_Error
;
7580 Actual_Pack
:= Entity
(Actual
);
7581 Set_Is_Instantiated
(Actual_Pack
);
7583 -- The actual may be a renamed package, or an outer generic formal
7584 -- package whose instantiation is converted into a renaming.
7586 if Present
(Renamed_Object
(Actual_Pack
)) then
7587 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
7590 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
7591 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
7592 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
7595 Generic_Parent
(Specification
(Analyzed_Formal
));
7597 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7600 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
7601 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
7603 Parent_Spec
:= Parent
(Actual_Pack
);
7606 if Gen_Parent
= Any_Id
then
7608 ("previous error in declaration of formal package", Actual
);
7609 Abandon_Instantiation
(Actual
);
7612 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
7618 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
7619 Abandon_Instantiation
(Actual
);
7622 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
7623 Map_Entities
(Formal_Pack
, Actual_Pack
);
7626 Make_Package_Renaming_Declaration
(Loc
,
7627 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
7628 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
7630 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
7631 Defining_Identifier
(Formal
));
7632 Decls
:= New_List
(Nod
);
7634 -- If the formal F has a box, then the generic declarations are
7635 -- visible in the generic G. In an instance of G, the corresponding
7636 -- entities in the actual for F (which are the actuals for the
7637 -- instantiation of the generic that F denotes) must also be made
7638 -- visible for analysis of the current instance. On exit from the
7639 -- current instance, those entities are made private again. If the
7640 -- actual is currently in use, these entities are also use-visible.
7642 -- The loop through the actual entities also steps through the formal
7643 -- entities and enters associations from formals to actuals into the
7644 -- renaming map. This is necessary to properly handle checking of
7645 -- actual parameter associations for later formals that depend on
7646 -- actuals declared in the formal package.
7648 -- In Ada 2005, partial parametrization requires that we make visible
7649 -- the actuals corresponding to formals that were defaulted in the
7650 -- formal package. There formals are identified because they remain
7651 -- formal generics within the formal package, rather than being
7652 -- renamings of the actuals supplied.
7655 Gen_Decl
: constant Node_Id
:=
7656 Unit_Declaration_Node
(Gen_Parent
);
7657 Formals
: constant List_Id
:=
7658 Generic_Formal_Declarations
(Gen_Decl
);
7660 Actual_Ent
: Entity_Id
;
7661 Actual_Of_Formal
: Node_Id
;
7662 Formal_Node
: Node_Id
;
7663 Formal_Ent
: Entity_Id
;
7666 if Present
(Formals
) then
7667 Formal_Node
:= First_Non_Pragma
(Formals
);
7669 Formal_Node
:= Empty
;
7672 Actual_Ent
:= First_Entity
(Actual_Pack
);
7674 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
7675 while Present
(Actual_Ent
)
7676 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7678 if Present
(Formal_Node
) then
7679 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
7681 if Present
(Formal_Ent
) then
7682 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
7684 (Formal_Node
, Formal_Ent
, Actual_Ent
);
7686 -- We iterate at the same time over the actuals of the
7687 -- local package created for the formal, to determine
7688 -- which one of the formals of the original generic were
7689 -- defaulted in the formal. The corresponding actual
7690 -- entities are visible in the enclosing instance.
7692 if Box_Present
(Formal
)
7694 (Present
(Actual_Of_Formal
)
7697 (Get_Formal_Entity
(Actual_Of_Formal
)))
7699 Set_Is_Hidden
(Actual_Ent
, False);
7700 Set_Is_Visible_Formal
(Actual_Ent
);
7701 Set_Is_Potentially_Use_Visible
7702 (Actual_Ent
, In_Use
(Actual_Pack
));
7704 if Ekind
(Actual_Ent
) = E_Package
then
7705 Process_Nested_Formal
(Actual_Ent
);
7709 Set_Is_Hidden
(Actual_Ent
);
7710 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
7714 Next_Non_Pragma
(Formal_Node
);
7715 Next
(Actual_Of_Formal
);
7718 -- No further formals to match, but the generic part may
7719 -- contain inherited operation that are not hidden in the
7720 -- enclosing instance.
7722 Next_Entity
(Actual_Ent
);
7726 -- Inherited subprograms generated by formal derived types are
7727 -- also visible if the types are.
7729 Actual_Ent
:= First_Entity
(Actual_Pack
);
7730 while Present
(Actual_Ent
)
7731 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7733 if Is_Overloadable
(Actual_Ent
)
7735 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
7737 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
7739 Set_Is_Hidden
(Actual_Ent
, False);
7740 Set_Is_Potentially_Use_Visible
7741 (Actual_Ent
, In_Use
(Actual_Pack
));
7744 Next_Entity
(Actual_Ent
);
7748 -- If the formal is not declared with a box, reanalyze it as an
7749 -- abbreviated instantiation, to verify the matching rules of 12.7.
7750 -- The actual checks are performed after the generic associations
7751 -- have been analyzed, to guarantee the same visibility for this
7752 -- instantiation and for the actuals.
7754 -- In Ada 2005, the generic associations for the formal can include
7755 -- defaulted parameters. These are ignored during check. This
7756 -- internal instantiation is removed from the tree after conformance
7757 -- checking, because it contains formal declarations for those
7758 -- defaulted parameters, and those should not reach the back-end.
7760 if not Box_Present
(Formal
) then
7762 I_Pack
: constant Entity_Id
:=
7763 Make_Defining_Identifier
(Sloc
(Actual
),
7764 Chars
=> New_Internal_Name
('P'));
7767 Set_Is_Internal
(I_Pack
);
7770 Make_Package_Instantiation
(Sloc
(Actual
),
7771 Defining_Unit_Name
=> I_Pack
,
7774 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
7775 Generic_Associations
=>
7776 Generic_Associations
(Formal
)));
7782 end Instantiate_Formal_Package
;
7784 -----------------------------------
7785 -- Instantiate_Formal_Subprogram --
7786 -----------------------------------
7788 function Instantiate_Formal_Subprogram
7791 Analyzed_Formal
: Node_Id
) return Node_Id
7794 Formal_Sub
: constant Entity_Id
:=
7795 Defining_Unit_Name
(Specification
(Formal
));
7796 Analyzed_S
: constant Entity_Id
:=
7797 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7798 Decl_Node
: Node_Id
;
7802 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
7803 -- If the generic is a child unit, the parent has been installed on the
7804 -- scope stack, but a default subprogram cannot resolve to something on
7805 -- the parent because that parent is not really part of the visible
7806 -- context (it is there to resolve explicit local entities). If the
7807 -- default has resolved in this way, we remove the entity from
7808 -- immediate visibility and analyze the node again to emit an error
7809 -- message or find another visible candidate.
7811 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
7812 -- Perform legality check and raise exception on failure
7814 -----------------------
7815 -- From_Parent_Scope --
7816 -----------------------
7818 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
7819 Gen_Scope
: Node_Id
;
7822 Gen_Scope
:= Scope
(Analyzed_S
);
7823 while Present
(Gen_Scope
)
7824 and then Is_Child_Unit
(Gen_Scope
)
7826 if Scope
(Subp
) = Scope
(Gen_Scope
) then
7830 Gen_Scope
:= Scope
(Gen_Scope
);
7834 end From_Parent_Scope
;
7836 -----------------------------
7837 -- Valid_Actual_Subprogram --
7838 -----------------------------
7840 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
7844 if Is_Entity_Name
(Act
) then
7845 Act_E
:= Entity
(Act
);
7847 elsif Nkind
(Act
) = N_Selected_Component
7848 and then Is_Entity_Name
(Selector_Name
(Act
))
7850 Act_E
:= Entity
(Selector_Name
(Act
));
7856 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
7857 or else Nkind_In
(Act
, N_Attribute_Reference
,
7858 N_Indexed_Component
,
7859 N_Character_Literal
,
7860 N_Explicit_Dereference
)
7866 ("expect subprogram or entry name in instantiation of&",
7867 Instantiation_Node
, Formal_Sub
);
7868 Abandon_Instantiation
(Instantiation_Node
);
7870 end Valid_Actual_Subprogram
;
7872 -- Start of processing for Instantiate_Formal_Subprogram
7875 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
7877 -- The tree copy has created the proper instantiation sloc for the
7878 -- new specification. Use this location for all other constructed
7881 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
7883 -- Create new entity for the actual (New_Copy_Tree does not)
7885 Set_Defining_Unit_Name
7886 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7888 -- Create new entities for the each of the formals in the
7889 -- specification of the renaming declaration built for the actual.
7891 if Present
(Parameter_Specifications
(New_Spec
)) then
7895 F
:= First
(Parameter_Specifications
(New_Spec
));
7896 while Present
(F
) loop
7897 Set_Defining_Identifier
(F
,
7898 Make_Defining_Identifier
(Sloc
(F
),
7899 Chars
=> Chars
(Defining_Identifier
(F
))));
7905 -- Find entity of actual. If the actual is an attribute reference, it
7906 -- cannot be resolved here (its formal is missing) but is handled
7907 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7908 -- fully resolved subsequently, when the renaming declaration for the
7909 -- formal is analyzed. If it is an explicit dereference, resolve the
7910 -- prefix but not the actual itself, to prevent interpretation as call.
7912 if Present
(Actual
) then
7913 Loc
:= Sloc
(Actual
);
7914 Set_Sloc
(New_Spec
, Loc
);
7916 if Nkind
(Actual
) = N_Operator_Symbol
then
7917 Find_Direct_Name
(Actual
);
7919 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
7920 Analyze
(Prefix
(Actual
));
7922 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
7926 Valid_Actual_Subprogram
(Actual
);
7929 elsif Present
(Default_Name
(Formal
)) then
7930 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
7931 N_Selected_Component
,
7932 N_Indexed_Component
,
7933 N_Character_Literal
)
7934 and then Present
(Entity
(Default_Name
(Formal
)))
7936 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
7938 Nam
:= New_Copy
(Default_Name
(Formal
));
7939 Set_Sloc
(Nam
, Loc
);
7942 elsif Box_Present
(Formal
) then
7944 -- Actual is resolved at the point of instantiation. Create an
7945 -- identifier or operator with the same name as the formal.
7947 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
7948 Nam
:= Make_Operator_Symbol
(Loc
,
7949 Chars
=> Chars
(Formal_Sub
),
7950 Strval
=> No_String
);
7952 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
7955 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
7956 and then Null_Present
(Specification
(Formal
))
7958 -- Generate null body for procedure, for use in the instance
7961 Make_Subprogram_Body
(Loc
,
7962 Specification
=> New_Spec
,
7963 Declarations
=> New_List
,
7964 Handled_Statement_Sequence
=>
7965 Make_Handled_Sequence_Of_Statements
(Loc
,
7966 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
7968 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
7972 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
7974 ("missing actual&", Instantiation_Node
, Formal_Sub
);
7976 ("\in instantiation of & declared#",
7977 Instantiation_Node
, Scope
(Analyzed_S
));
7978 Abandon_Instantiation
(Instantiation_Node
);
7982 Make_Subprogram_Renaming_Declaration
(Loc
,
7983 Specification
=> New_Spec
,
7986 -- If we do not have an actual and the formal specified <> then set to
7987 -- get proper default.
7989 if No
(Actual
) and then Box_Present
(Formal
) then
7990 Set_From_Default
(Decl_Node
);
7993 -- Gather possible interpretations for the actual before analyzing the
7994 -- instance. If overloaded, it will be resolved when analyzing the
7995 -- renaming declaration.
7997 if Box_Present
(Formal
)
7998 and then No
(Actual
)
8002 if Is_Child_Unit
(Scope
(Analyzed_S
))
8003 and then Present
(Entity
(Nam
))
8005 if not Is_Overloaded
(Nam
) then
8007 if From_Parent_Scope
(Entity
(Nam
)) then
8008 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
8009 Set_Entity
(Nam
, Empty
);
8010 Set_Etype
(Nam
, Empty
);
8014 Set_Is_Immediately_Visible
(Entity
(Nam
));
8023 Get_First_Interp
(Nam
, I
, It
);
8025 while Present
(It
.Nam
) loop
8026 if From_Parent_Scope
(It
.Nam
) then
8030 Get_Next_Interp
(I
, It
);
8037 -- The generic instantiation freezes the actual. This can only be done
8038 -- once the actual is resolved, in the analysis of the renaming
8039 -- declaration. To make the formal subprogram entity available, we set
8040 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8041 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8042 -- of formal abstract subprograms.
8044 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
8046 -- We cannot analyze the renaming declaration, and thus find the actual,
8047 -- until all the actuals are assembled in the instance. For subsequent
8048 -- checks of other actuals, indicate the node that will hold the
8049 -- instance of this formal.
8051 Set_Instance_Of
(Analyzed_S
, Nam
);
8053 if Nkind
(Actual
) = N_Selected_Component
8054 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
8055 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
8057 -- The renaming declaration will create a body, which must appear
8058 -- outside of the instantiation, We move the renaming declaration
8059 -- out of the instance, and create an additional renaming inside,
8060 -- to prevent freezing anomalies.
8063 Anon_Id
: constant Entity_Id
:=
8064 Make_Defining_Identifier
8065 (Loc
, New_Internal_Name
('E'));
8067 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
8068 Insert_Before
(Instantiation_Node
, Decl_Node
);
8069 Analyze
(Decl_Node
);
8071 -- Now create renaming within the instance
8074 Make_Subprogram_Renaming_Declaration
(Loc
,
8075 Specification
=> New_Copy_Tree
(New_Spec
),
8076 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
8078 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
8079 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
8084 end Instantiate_Formal_Subprogram
;
8086 ------------------------
8087 -- Instantiate_Object --
8088 ------------------------
8090 function Instantiate_Object
8093 Analyzed_Formal
: Node_Id
) return List_Id
8095 Acc_Def
: Node_Id
:= Empty
;
8096 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
8097 Actual_Decl
: Node_Id
:= Empty
;
8098 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
8099 Decl_Node
: Node_Id
;
8102 List
: constant List_Id
:= New_List
;
8103 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
8104 Orig_Ftyp
: constant Entity_Id
:=
8105 Etype
(Defining_Identifier
(Analyzed_Formal
));
8106 Subt_Decl
: Node_Id
:= Empty
;
8107 Subt_Mark
: Node_Id
:= Empty
;
8110 if Present
(Subtype_Mark
(Formal
)) then
8111 Subt_Mark
:= Subtype_Mark
(Formal
);
8113 Check_Access_Definition
(Formal
);
8114 Acc_Def
:= Access_Definition
(Formal
);
8117 -- Sloc for error message on missing actual
8119 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
8121 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
8122 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
8125 Set_Parent
(List
, Parent
(Actual
));
8129 if Out_Present
(Formal
) then
8131 -- An IN OUT generic actual must be a name. The instantiation is a
8132 -- renaming declaration. The actual is the name being renamed. We
8133 -- use the actual directly, rather than a copy, because it is not
8134 -- used further in the list of actuals, and because a copy or a use
8135 -- of relocate_node is incorrect if the instance is nested within a
8136 -- generic. In order to simplify ASIS searches, the Generic_Parent
8137 -- field links the declaration to the generic association.
8142 Instantiation_Node
, Formal_Id
);
8144 ("\in instantiation of & declared#",
8146 Scope
(Defining_Identifier
(Analyzed_Formal
)));
8147 Abandon_Instantiation
(Instantiation_Node
);
8150 if Present
(Subt_Mark
) then
8152 Make_Object_Renaming_Declaration
(Loc
,
8153 Defining_Identifier
=> New_Copy
(Formal_Id
),
8154 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
8157 else pragma Assert
(Present
(Acc_Def
));
8159 Make_Object_Renaming_Declaration
(Loc
,
8160 Defining_Identifier
=> New_Copy
(Formal_Id
),
8161 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
8165 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8167 -- The analysis of the actual may produce insert_action nodes, so
8168 -- the declaration must have a context in which to attach them.
8170 Append
(Decl_Node
, List
);
8173 -- Return if the analysis of the actual reported some error
8175 if Etype
(Actual
) = Any_Type
then
8179 -- This check is performed here because Analyze_Object_Renaming will
8180 -- not check it when Comes_From_Source is False. Note though that the
8181 -- check for the actual being the name of an object will be performed
8182 -- in Analyze_Object_Renaming.
8184 if Is_Object_Reference
(Actual
)
8185 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
8188 ("illegal discriminant-dependent component for in out parameter",
8192 -- The actual has to be resolved in order to check that it is a
8193 -- variable (due to cases such as F(1), where F returns
8194 -- access to an array, and for overloaded prefixes).
8197 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
8199 if Is_Private_Type
(Ftyp
)
8200 and then not Is_Private_Type
(Etype
(Actual
))
8201 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
8202 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
8204 -- If the actual has the type of the full view of the formal, or
8205 -- else a non-private subtype of the formal, then the visibility
8206 -- of the formal type has changed. Add to the actuals a subtype
8207 -- declaration that will force the exchange of views in the body
8208 -- of the instance as well.
8211 Make_Subtype_Declaration
(Loc
,
8212 Defining_Identifier
=>
8213 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
8214 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
8216 Prepend
(Subt_Decl
, List
);
8218 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
8219 Exchange_Declarations
(Ftyp
);
8222 Resolve
(Actual
, Ftyp
);
8224 if not Denotes_Variable
(Actual
) then
8226 ("actual for& must be a variable", Actual
, Formal_Id
);
8228 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
8230 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8231 -- the type of the actual shall resolve to a specific anonymous
8234 if Ada_Version
< Ada_05
8236 Ekind
(Base_Type
(Ftyp
)) /=
8237 E_Anonymous_Access_Type
8239 Ekind
(Base_Type
(Etype
(Actual
))) /=
8240 E_Anonymous_Access_Type
8242 Error_Msg_NE
("type of actual does not match type of&",
8247 Note_Possible_Modification
(Actual
, Sure
=> True);
8249 -- Check for instantiation of atomic/volatile actual for
8250 -- non-atomic/volatile formal (RM C.6 (12)).
8252 if Is_Atomic_Object
(Actual
)
8253 and then not Is_Atomic
(Orig_Ftyp
)
8256 ("cannot instantiate non-atomic formal object " &
8257 "with atomic actual", Actual
);
8259 elsif Is_Volatile_Object
(Actual
)
8260 and then not Is_Volatile
(Orig_Ftyp
)
8263 ("cannot instantiate non-volatile formal object " &
8264 "with volatile actual", Actual
);
8270 -- The instantiation of a generic formal in-parameter is constant
8271 -- declaration. The actual is the expression for that declaration.
8273 if Present
(Actual
) then
8274 if Present
(Subt_Mark
) then
8276 else pragma Assert
(Present
(Acc_Def
));
8281 Make_Object_Declaration
(Loc
,
8282 Defining_Identifier
=> New_Copy
(Formal_Id
),
8283 Constant_Present
=> True,
8284 Object_Definition
=> New_Copy_Tree
(Def
),
8285 Expression
=> Actual
);
8287 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8289 -- A generic formal object of a tagged type is defined to be
8290 -- aliased so the new constant must also be treated as aliased.
8293 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
8295 Set_Aliased_Present
(Decl_Node
);
8298 Append
(Decl_Node
, List
);
8300 -- No need to repeat (pre-)analysis of some expression nodes
8301 -- already handled in Preanalyze_Actuals.
8303 if Nkind
(Actual
) /= N_Allocator
then
8306 -- Return if the analysis of the actual reported some error
8308 if Etype
(Actual
) = Any_Type
then
8314 Typ
: constant Entity_Id
:=
8316 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
8319 Freeze_Before
(Instantiation_Node
, Typ
);
8321 -- If the actual is an aggregate, perform name resolution on
8322 -- its components (the analysis of an aggregate does not do it)
8323 -- to capture local names that may be hidden if the generic is
8326 if Nkind
(Actual
) = N_Aggregate
then
8327 Preanalyze_And_Resolve
(Actual
, Typ
);
8330 if Is_Limited_Type
(Typ
)
8331 and then not OK_For_Limited_Init
(Actual
)
8334 ("initialization not allowed for limited types", Actual
);
8335 Explain_Limited_Type
(Typ
, Actual
);
8339 elsif Present
(Default_Expression
(Formal
)) then
8341 -- Use default to construct declaration
8343 if Present
(Subt_Mark
) then
8345 else pragma Assert
(Present
(Acc_Def
));
8350 Make_Object_Declaration
(Sloc
(Formal
),
8351 Defining_Identifier
=> New_Copy
(Formal_Id
),
8352 Constant_Present
=> True,
8353 Object_Definition
=> New_Copy
(Def
),
8354 Expression
=> New_Copy_Tree
(Default_Expression
8357 Append
(Decl_Node
, List
);
8358 Set_Analyzed
(Expression
(Decl_Node
), False);
8363 Instantiation_Node
, Formal_Id
);
8364 Error_Msg_NE
("\in instantiation of & declared#",
8366 Scope
(Defining_Identifier
(Analyzed_Formal
)));
8369 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
8371 -- Create dummy constant declaration so that instance can be
8372 -- analyzed, to minimize cascaded visibility errors.
8374 if Present
(Subt_Mark
) then
8376 else pragma Assert
(Present
(Acc_Def
));
8381 Make_Object_Declaration
(Loc
,
8382 Defining_Identifier
=> New_Copy
(Formal_Id
),
8383 Constant_Present
=> True,
8384 Object_Definition
=> New_Copy
(Def
),
8386 Make_Attribute_Reference
(Sloc
(Formal_Id
),
8387 Attribute_Name
=> Name_First
,
8388 Prefix
=> New_Copy
(Def
)));
8390 Append
(Decl_Node
, List
);
8393 Abandon_Instantiation
(Instantiation_Node
);
8398 if Nkind
(Actual
) in N_Has_Entity
then
8399 Actual_Decl
:= Parent
(Entity
(Actual
));
8402 -- Ada 2005 (AI-423): For a formal object declaration with a null
8403 -- exclusion or an access definition that has a null exclusion: If the
8404 -- actual matching the formal object declaration denotes a generic
8405 -- formal object of another generic unit G, and the instantiation
8406 -- containing the actual occurs within the body of G or within the body
8407 -- of a generic unit declared within the declarative region of G, then
8408 -- the declaration of the formal object of G must have a null exclusion.
8409 -- Otherwise, the subtype of the actual matching the formal object
8410 -- declaration shall exclude null.
8412 if Ada_Version
>= Ada_05
8413 and then Present
(Actual_Decl
)
8415 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
8416 N_Object_Declaration
)
8417 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
8418 and then not Has_Null_Exclusion
(Actual_Decl
)
8419 and then Has_Null_Exclusion
(Analyzed_Formal
)
8421 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
8423 ("actual must exclude null to match generic formal#", Actual
);
8427 end Instantiate_Object
;
8429 ------------------------------
8430 -- Instantiate_Package_Body --
8431 ------------------------------
8433 procedure Instantiate_Package_Body
8434 (Body_Info
: Pending_Body_Info
;
8435 Inlined_Body
: Boolean := False;
8436 Body_Optional
: Boolean := False)
8438 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8439 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8440 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8442 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8443 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8444 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8445 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
8446 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
8448 Act_Body_Name
: Node_Id
;
8450 Gen_Body_Id
: Node_Id
;
8452 Act_Body_Id
: Entity_Id
;
8454 Parent_Installed
: Boolean := False;
8455 Save_Style_Check
: constant Boolean := Style_Check
;
8458 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8460 -- The instance body may already have been processed, as the parent of
8461 -- another instance that is inlined (Load_Parent_Of_Generic).
8463 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8467 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8469 -- Re-establish the state of information on which checks are suppressed.
8470 -- This information was set in Body_Info at the point of instantiation,
8471 -- and now we restore it so that the instance is compiled using the
8472 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8474 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8475 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8477 if No
(Gen_Body_Id
) then
8478 Load_Parent_Of_Generic
8479 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8480 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8483 -- Establish global variable for sloc adjustment and for error recovery
8485 Instantiation_Node
:= Inst_Node
;
8487 if Present
(Gen_Body_Id
) then
8488 Save_Env
(Gen_Unit
, Act_Decl_Id
);
8489 Style_Check
:= False;
8490 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
8492 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8494 Create_Instantiation_Source
8495 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
8499 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
8501 -- Build new name (possibly qualified) for body declaration
8503 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
8505 -- Some attributes of spec entity are not inherited by body entity
8507 Set_Handler_Records
(Act_Body_Id
, No_List
);
8509 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8510 N_Defining_Program_Unit_Name
8513 Make_Defining_Program_Unit_Name
(Loc
,
8514 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
8515 Defining_Identifier
=> Act_Body_Id
);
8517 Act_Body_Name
:= Act_Body_Id
;
8520 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
8522 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
8523 Check_Generic_Actuals
(Act_Decl_Id
, False);
8525 -- If it is a child unit, make the parent instance (which is an
8526 -- instance of the parent of the generic) visible. The parent
8527 -- instance is the prefix of the name of the generic unit.
8529 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
8530 and then Nkind
(Gen_Id
) = N_Expanded_Name
8532 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
8533 Parent_Installed
:= True;
8535 elsif Is_Child_Unit
(Gen_Unit
) then
8536 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
8537 Parent_Installed
:= True;
8540 -- If the instantiation is a library unit, and this is the main unit,
8541 -- then build the resulting compilation unit nodes for the instance.
8542 -- If this is a compilation unit but it is not the main unit, then it
8543 -- is the body of a unit in the context, that is being compiled
8544 -- because it is encloses some inlined unit or another generic unit
8545 -- being instantiated. In that case, this body is not part of the
8546 -- current compilation, and is not attached to the tree, but its
8547 -- parent must be set for analysis.
8549 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8551 -- Replace instance node with body of instance, and create new
8552 -- node for corresponding instance declaration.
8554 Build_Instance_Compilation_Unit_Nodes
8555 (Inst_Node
, Act_Body
, Act_Decl
);
8556 Analyze
(Inst_Node
);
8558 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
8560 -- If the instance is a child unit itself, then set the scope
8561 -- of the expanded body to be the parent of the instantiation
8562 -- (ensuring that the fully qualified name will be generated
8563 -- for the elaboration subprogram).
8565 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8566 N_Defining_Program_Unit_Name
8569 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
8573 -- Case where instantiation is not a library unit
8576 -- If this is an early instantiation, i.e. appears textually
8577 -- before the corresponding body and must be elaborated first,
8578 -- indicate that the body instance is to be delayed.
8580 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
8582 -- Now analyze the body. We turn off all checks if this is an
8583 -- internal unit, since there is no reason to have checks on for
8584 -- any predefined run-time library code. All such code is designed
8585 -- to be compiled with checks off.
8587 -- Note that we do NOT apply this criterion to children of GNAT
8588 -- (or on VMS, children of DEC). The latter units must suppress
8589 -- checks explicitly if this is needed.
8591 if Is_Predefined_File_Name
8592 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
8594 Analyze
(Act_Body
, Suppress
=> All_Checks
);
8600 Inherit_Context
(Gen_Body
, Inst_Node
);
8602 -- Remove the parent instances if they have been placed on the scope
8603 -- stack to compile the body.
8605 if Parent_Installed
then
8606 Remove_Parent
(In_Body
=> True);
8609 Restore_Private_Views
(Act_Decl_Id
);
8611 -- Remove the current unit from visibility if this is an instance
8612 -- that is not elaborated on the fly for inlining purposes.
8614 if not Inlined_Body
then
8615 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
8619 Style_Check
:= Save_Style_Check
;
8621 -- If we have no body, and the unit requires a body, then complain. This
8622 -- complaint is suppressed if we have detected other errors (since a
8623 -- common reason for missing the body is that it had errors).
8625 elsif Unit_Requires_Body
(Gen_Unit
)
8626 and then not Body_Optional
8628 if Serious_Errors_Detected
= 0 then
8630 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
8632 -- Don't attempt to perform any cleanup actions if some other error
8633 -- was already detected, since this can cause blowups.
8639 -- Case of package that does not need a body
8642 -- If the instantiation of the declaration is a library unit, rewrite
8643 -- the original package instantiation as a package declaration in the
8644 -- compilation unit node.
8646 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8647 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
8648 Rewrite
(Inst_Node
, Act_Decl
);
8650 -- Generate elaboration entity, in case spec has elaboration code.
8651 -- This cannot be done when the instance is analyzed, because it
8652 -- is not known yet whether the body exists.
8654 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
8655 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
8657 -- If the instantiation is not a library unit, then append the
8658 -- declaration to the list of implicitly generated entities, unless
8659 -- it is already a list member which means that it was already
8662 elsif not Is_List_Member
(Act_Decl
) then
8663 Mark_Rewrite_Insertion
(Act_Decl
);
8664 Insert_Before
(Inst_Node
, Act_Decl
);
8668 Expander_Mode_Restore
;
8669 end Instantiate_Package_Body
;
8671 ---------------------------------
8672 -- Instantiate_Subprogram_Body --
8673 ---------------------------------
8675 procedure Instantiate_Subprogram_Body
8676 (Body_Info
: Pending_Body_Info
;
8677 Body_Optional
: Boolean := False)
8679 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8680 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8681 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8682 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8683 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8684 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8685 Anon_Id
: constant Entity_Id
:=
8686 Defining_Unit_Name
(Specification
(Act_Decl
));
8687 Pack_Id
: constant Entity_Id
:=
8688 Defining_Unit_Name
(Parent
(Act_Decl
));
8691 Gen_Body_Id
: Node_Id
;
8693 Pack_Body
: Node_Id
;
8694 Prev_Formal
: Entity_Id
;
8696 Unit_Renaming
: Node_Id
;
8698 Parent_Installed
: Boolean := False;
8699 Save_Style_Check
: constant Boolean := Style_Check
;
8702 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8704 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8706 -- Re-establish the state of information on which checks are suppressed.
8707 -- This information was set in Body_Info at the point of instantiation,
8708 -- and now we restore it so that the instance is compiled using the
8709 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8711 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8712 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8714 if No
(Gen_Body_Id
) then
8716 -- For imported generic subprogram, no body to compile, complete
8717 -- the spec entity appropriately.
8719 if Is_Imported
(Gen_Unit
) then
8720 Set_Is_Imported
(Anon_Id
);
8721 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
8722 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
8723 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
8724 Set_Has_Completion
(Anon_Id
);
8727 -- For other cases, compile the body
8730 Load_Parent_Of_Generic
8731 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8732 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8736 Instantiation_Node
:= Inst_Node
;
8738 if Present
(Gen_Body_Id
) then
8739 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8741 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
8743 -- Either body is not present, or context is non-expanding, as
8744 -- when compiling a subunit. Mark the instance as completed, and
8745 -- diagnose a missing body when needed.
8748 and then Operating_Mode
= Generate_Code
8751 ("missing proper body for instantiation", Gen_Body
);
8754 Set_Has_Completion
(Anon_Id
);
8758 Save_Env
(Gen_Unit
, Anon_Id
);
8759 Style_Check
:= False;
8760 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
8761 Create_Instantiation_Source
8769 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
8771 -- Create proper defining name for the body, to correspond to
8772 -- the one in the spec.
8774 Set_Defining_Unit_Name
(Specification
(Act_Body
),
8775 Make_Defining_Identifier
8776 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
8777 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
8778 Set_Has_Completion
(Anon_Id
);
8779 Check_Generic_Actuals
(Pack_Id
, False);
8781 -- Generate a reference to link the visible subprogram instance to
8782 -- the generic body, which for navigation purposes is the only
8783 -- available source for the instance.
8786 (Related_Instance
(Pack_Id
),
8787 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
8789 -- If it is a child unit, make the parent instance (which is an
8790 -- instance of the parent of the generic) visible. The parent
8791 -- instance is the prefix of the name of the generic unit.
8793 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
8794 and then Nkind
(Gen_Id
) = N_Expanded_Name
8796 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
8797 Parent_Installed
:= True;
8799 elsif Is_Child_Unit
(Gen_Unit
) then
8800 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
8801 Parent_Installed
:= True;
8804 -- Inside its body, a reference to the generic unit is a reference
8805 -- to the instance. The corresponding renaming is the first
8806 -- declaration in the body.
8809 Make_Subprogram_Renaming_Declaration
(Loc
,
8812 Specification
(Original_Node
(Gen_Body
)),
8814 Instantiating
=> True),
8815 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
8817 -- If there is a formal subprogram with the same name as the unit
8818 -- itself, do not add this renaming declaration. This is a temporary
8819 -- fix for one ACVC test. ???
8821 Prev_Formal
:= First_Entity
(Pack_Id
);
8822 while Present
(Prev_Formal
) loop
8823 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
8824 and then Is_Overloadable
(Prev_Formal
)
8829 Next_Entity
(Prev_Formal
);
8832 if Present
(Prev_Formal
) then
8833 Decls
:= New_List
(Act_Body
);
8835 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
8838 -- The subprogram body is placed in the body of a dummy package body,
8839 -- whose spec contains the subprogram declaration as well as the
8840 -- renaming declarations for the generic parameters.
8842 Pack_Body
:= Make_Package_Body
(Loc
,
8843 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
8844 Declarations
=> Decls
);
8846 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
8848 -- If the instantiation is a library unit, then build resulting
8849 -- compilation unit nodes for the instance. The declaration of
8850 -- the enclosing package is the grandparent of the subprogram
8851 -- declaration. First replace the instantiation node as the unit
8852 -- of the corresponding compilation.
8854 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8855 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
8856 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
8857 Build_Instance_Compilation_Unit_Nodes
8858 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
8859 Analyze
(Inst_Node
);
8861 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
8862 Analyze
(Pack_Body
);
8866 Insert_Before
(Inst_Node
, Pack_Body
);
8867 Mark_Rewrite_Insertion
(Pack_Body
);
8868 Analyze
(Pack_Body
);
8870 if Expander_Active
then
8871 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
8875 Inherit_Context
(Gen_Body
, Inst_Node
);
8877 Restore_Private_Views
(Pack_Id
, False);
8879 if Parent_Installed
then
8880 Remove_Parent
(In_Body
=> True);
8884 Style_Check
:= Save_Style_Check
;
8886 -- Body not found. Error was emitted already. If there were no previous
8887 -- errors, this may be an instance whose scope is a premature instance.
8888 -- In that case we must insure that the (legal) program does raise
8889 -- program error if executed. We generate a subprogram body for this
8890 -- purpose. See DEC ac30vso.
8892 -- Should not reference proprietary DEC tests in comments ???
8894 elsif Serious_Errors_Detected
= 0
8895 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
8897 if Body_Optional
then
8900 elsif Ekind
(Anon_Id
) = E_Procedure
then
8902 Make_Subprogram_Body
(Loc
,
8904 Make_Procedure_Specification
(Loc
,
8905 Defining_Unit_Name
=>
8906 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
8907 Parameter_Specifications
=>
8909 (Parameter_Specifications
(Parent
(Anon_Id
)))),
8911 Declarations
=> Empty_List
,
8912 Handled_Statement_Sequence
=>
8913 Make_Handled_Sequence_Of_Statements
(Loc
,
8916 Make_Raise_Program_Error
(Loc
,
8918 PE_Access_Before_Elaboration
))));
8922 Make_Raise_Program_Error
(Loc
,
8923 Reason
=> PE_Access_Before_Elaboration
);
8925 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
8926 Set_Analyzed
(Ret_Expr
);
8929 Make_Subprogram_Body
(Loc
,
8931 Make_Function_Specification
(Loc
,
8932 Defining_Unit_Name
=>
8933 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
8934 Parameter_Specifications
=>
8936 (Parameter_Specifications
(Parent
(Anon_Id
))),
8937 Result_Definition
=>
8938 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
8940 Declarations
=> Empty_List
,
8941 Handled_Statement_Sequence
=>
8942 Make_Handled_Sequence_Of_Statements
(Loc
,
8945 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
8948 Pack_Body
:= Make_Package_Body
(Loc
,
8949 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
8950 Declarations
=> New_List
(Act_Body
));
8952 Insert_After
(Inst_Node
, Pack_Body
);
8953 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
8954 Analyze
(Pack_Body
);
8957 Expander_Mode_Restore
;
8958 end Instantiate_Subprogram_Body
;
8960 ----------------------
8961 -- Instantiate_Type --
8962 ----------------------
8964 function Instantiate_Type
8967 Analyzed_Formal
: Node_Id
;
8968 Actual_Decls
: List_Id
) return List_Id
8970 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
8971 A_Gen_T
: constant Entity_Id
:=
8972 Defining_Identifier
(Analyzed_Formal
);
8973 Ancestor
: Entity_Id
:= Empty
;
8974 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
8976 Decl_Node
: Node_Id
;
8977 Decl_Nodes
: List_Id
;
8981 procedure Validate_Array_Type_Instance
;
8982 procedure Validate_Access_Subprogram_Instance
;
8983 procedure Validate_Access_Type_Instance
;
8984 procedure Validate_Derived_Type_Instance
;
8985 procedure Validate_Derived_Interface_Type_Instance
;
8986 procedure Validate_Interface_Type_Instance
;
8987 procedure Validate_Private_Type_Instance
;
8988 -- These procedures perform validation tests for the named case
8990 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
8991 -- Check that base types are the same and that the subtypes match
8992 -- statically. Used in several of the above.
8994 --------------------
8995 -- Subtypes_Match --
8996 --------------------
8998 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
8999 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
9002 return (Base_Type
(T
) = Base_Type
(Act_T
)
9003 and then Subtypes_Statically_Match
(T
, Act_T
))
9005 or else (Is_Class_Wide_Type
(Gen_T
)
9006 and then Is_Class_Wide_Type
(Act_T
)
9009 (Get_Instance_Of
(Root_Type
(Gen_T
)),
9013 ((Ekind
(Gen_T
) = E_Anonymous_Access_Subprogram_Type
9014 or else Ekind
(Gen_T
) = E_Anonymous_Access_Type
)
9015 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
9017 Subtypes_Statically_Match
9018 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
9021 -----------------------------------------
9022 -- Validate_Access_Subprogram_Instance --
9023 -----------------------------------------
9025 procedure Validate_Access_Subprogram_Instance
is
9027 if not Is_Access_Type
(Act_T
)
9028 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
9031 ("expect access type in instantiation of &", Actual
, Gen_T
);
9032 Abandon_Instantiation
(Actual
);
9035 Check_Mode_Conformant
9036 (Designated_Type
(Act_T
),
9037 Designated_Type
(A_Gen_T
),
9041 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
9042 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
9044 ("protected access type not allowed for formal &",
9048 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
9050 ("expect protected access type for formal &",
9053 end Validate_Access_Subprogram_Instance
;
9055 -----------------------------------
9056 -- Validate_Access_Type_Instance --
9057 -----------------------------------
9059 procedure Validate_Access_Type_Instance
is
9060 Desig_Type
: constant Entity_Id
:=
9061 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
9062 Desig_Act
: Entity_Id
;
9065 if not Is_Access_Type
(Act_T
) then
9067 ("expect access type in instantiation of &", Actual
, Gen_T
);
9068 Abandon_Instantiation
(Actual
);
9071 if Is_Access_Constant
(A_Gen_T
) then
9072 if not Is_Access_Constant
(Act_T
) then
9074 ("actual type must be access-to-constant type", Actual
);
9075 Abandon_Instantiation
(Actual
);
9078 if Is_Access_Constant
(Act_T
) then
9080 ("actual type must be access-to-variable type", Actual
);
9081 Abandon_Instantiation
(Actual
);
9083 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
9084 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
9086 Error_Msg_N
("actual must be general access type!", Actual
);
9087 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
9088 Abandon_Instantiation
(Actual
);
9092 -- The designated subtypes, that is to say the subtypes introduced
9093 -- by an access type declaration (and not by a subtype declaration)
9096 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
9098 -- The designated type may have been introduced through a limited_
9099 -- with clause, in which case retrieve the non-limited view. This
9100 -- applies to incomplete types as well as to class-wide types.
9102 if From_With_Type
(Desig_Act
) then
9103 Desig_Act
:= Available_View
(Desig_Act
);
9106 if not Subtypes_Match
9107 (Desig_Type
, Desig_Act
) then
9109 ("designated type of actual does not match that of formal &",
9111 Abandon_Instantiation
(Actual
);
9113 elsif Is_Access_Type
(Designated_Type
(Act_T
))
9114 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
9116 Is_Constrained
(Designated_Type
(Desig_Type
))
9119 ("designated type of actual does not match that of formal &",
9121 Abandon_Instantiation
(Actual
);
9124 -- Ada 2005: null-exclusion indicators of the two types must agree
9126 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
9128 ("non null exclusion of actual and formal & do not match",
9131 end Validate_Access_Type_Instance
;
9133 ----------------------------------
9134 -- Validate_Array_Type_Instance --
9135 ----------------------------------
9137 procedure Validate_Array_Type_Instance
is
9142 function Formal_Dimensions
return Int
;
9143 -- Count number of dimensions in array type formal
9145 -----------------------
9146 -- Formal_Dimensions --
9147 -----------------------
9149 function Formal_Dimensions
return Int
is
9154 if Nkind
(Def
) = N_Constrained_Array_Definition
then
9155 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
9157 Index
:= First
(Subtype_Marks
(Def
));
9160 while Present
(Index
) loop
9166 end Formal_Dimensions
;
9168 -- Start of processing for Validate_Array_Type_Instance
9171 if not Is_Array_Type
(Act_T
) then
9173 ("expect array type in instantiation of &", Actual
, Gen_T
);
9174 Abandon_Instantiation
(Actual
);
9176 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
9177 if not (Is_Constrained
(Act_T
)) then
9179 ("expect constrained array in instantiation of &",
9181 Abandon_Instantiation
(Actual
);
9185 if Is_Constrained
(Act_T
) then
9187 ("expect unconstrained array in instantiation of &",
9189 Abandon_Instantiation
(Actual
);
9193 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
9195 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
9196 Abandon_Instantiation
(Actual
);
9199 I1
:= First_Index
(A_Gen_T
);
9200 I2
:= First_Index
(Act_T
);
9201 for J
in 1 .. Formal_Dimensions
loop
9203 -- If the indices of the actual were given by a subtype_mark,
9204 -- the index was transformed into a range attribute. Retrieve
9205 -- the original type mark for checking.
9207 if Is_Entity_Name
(Original_Node
(I2
)) then
9208 T2
:= Entity
(Original_Node
(I2
));
9213 if not Subtypes_Match
9214 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
9217 ("index types of actual do not match those of formal &",
9219 Abandon_Instantiation
(Actual
);
9226 if not Subtypes_Match
9227 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
9228 Component_Type
(Act_T
))
9231 ("component subtype of actual does not match that of formal &",
9233 Abandon_Instantiation
(Actual
);
9236 if Has_Aliased_Components
(A_Gen_T
)
9237 and then not Has_Aliased_Components
(Act_T
)
9240 ("actual must have aliased components to match formal type &",
9243 end Validate_Array_Type_Instance
;
9245 -----------------------------------------------
9246 -- Validate_Derived_Interface_Type_Instance --
9247 -----------------------------------------------
9249 procedure Validate_Derived_Interface_Type_Instance
is
9250 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
9254 -- First apply interface instance checks
9256 Validate_Interface_Type_Instance
;
9258 -- Verify that immediate parent interface is an ancestor of
9262 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
9265 ("interface actual must include progenitor&", Actual
, Par
);
9268 -- Now verify that the actual includes all other ancestors of
9271 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
9272 while Present
(Elmt
) loop
9273 if not Interface_Present_In_Ancestor
9274 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
9277 ("interface actual must include progenitor&",
9278 Actual
, Node
(Elmt
));
9283 end Validate_Derived_Interface_Type_Instance
;
9285 ------------------------------------
9286 -- Validate_Derived_Type_Instance --
9287 ------------------------------------
9289 procedure Validate_Derived_Type_Instance
is
9290 Actual_Discr
: Entity_Id
;
9291 Ancestor_Discr
: Entity_Id
;
9294 -- If the parent type in the generic declaration is itself a previous
9295 -- formal type, then it is local to the generic and absent from the
9296 -- analyzed generic definition. In that case the ancestor is the
9297 -- instance of the formal (which must have been instantiated
9298 -- previously), unless the ancestor is itself a formal derived type.
9299 -- In this latter case (which is the subject of Corrigendum 8652/0038
9300 -- (AI-202) the ancestor of the formals is the ancestor of its
9301 -- parent. Otherwise, the analyzed generic carries the parent type.
9302 -- If the parent type is defined in a previous formal package, then
9303 -- the scope of that formal package is that of the generic type
9304 -- itself, and it has already been mapped into the corresponding type
9305 -- in the actual package.
9307 -- Common case: parent type defined outside of the generic
9309 if Is_Entity_Name
(Subtype_Mark
(Def
))
9310 and then Present
(Entity
(Subtype_Mark
(Def
)))
9312 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
9314 -- Check whether parent is defined in a previous formal package
9317 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
9320 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
9322 -- The type may be a local derivation, or a type extension of a
9323 -- previous formal, or of a formal of a parent package.
9325 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
9327 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
9329 -- Check whether the parent is another derived formal type in the
9330 -- same generic unit.
9332 if Etype
(A_Gen_T
) /= A_Gen_T
9333 and then Is_Generic_Type
(Etype
(A_Gen_T
))
9334 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
9335 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
9337 -- Locate ancestor of parent from the subtype declaration
9338 -- created for the actual.
9344 Decl
:= First
(Actual_Decls
);
9345 while Present
(Decl
) loop
9346 if Nkind
(Decl
) = N_Subtype_Declaration
9347 and then Chars
(Defining_Identifier
(Decl
)) =
9348 Chars
(Etype
(A_Gen_T
))
9350 Ancestor
:= Generic_Parent_Type
(Decl
);
9358 pragma Assert
(Present
(Ancestor
));
9362 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
9366 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
9369 -- If the formal derived type has pragma Preelaborable_Initialization
9370 -- then the actual type must have preelaborable initialization.
9372 if Known_To_Have_Preelab_Init
(A_Gen_T
)
9373 and then not Has_Preelaborable_Initialization
(Act_T
)
9376 ("actual for & must have preelaborable initialization",
9380 -- Ada 2005 (AI-251)
9382 if Ada_Version
>= Ada_05
9383 and then Is_Interface
(Ancestor
)
9385 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
9387 ("(Ada 2005) expected type implementing & in instantiation",
9391 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
9393 ("expect type derived from & in instantiation",
9394 Actual
, First_Subtype
(Ancestor
));
9395 Abandon_Instantiation
(Actual
);
9398 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
9399 -- that the formal type declaration has been rewritten as a private
9402 if Ada_Version
>= Ada_05
9403 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
9404 and then Synchronized_Present
(Parent
(A_Gen_T
))
9406 -- The actual must be a synchronized tagged type
9408 if not Is_Tagged_Type
(Act_T
) then
9410 ("actual of synchronized type must be tagged", Actual
);
9411 Abandon_Instantiation
(Actual
);
9413 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
9414 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
9415 N_Derived_Type_Definition
9416 and then not Synchronized_Present
(Type_Definition
9420 ("actual of synchronized type must be synchronized", Actual
);
9421 Abandon_Instantiation
(Actual
);
9425 -- Perform atomic/volatile checks (RM C.6(12))
9427 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
9429 ("cannot have atomic actual type for non-atomic formal type",
9432 elsif Is_Volatile
(Act_T
)
9433 and then not Is_Volatile
(Ancestor
)
9434 and then Is_By_Reference_Type
(Ancestor
)
9437 ("cannot have volatile actual type for non-volatile formal type",
9441 -- It should not be necessary to check for unknown discriminants on
9442 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9443 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9444 -- needs fixing. ???
9446 if not Is_Indefinite_Subtype
(A_Gen_T
)
9447 and then not Unknown_Discriminants_Present
(Formal
)
9448 and then Is_Indefinite_Subtype
(Act_T
)
9451 ("actual subtype must be constrained", Actual
);
9452 Abandon_Instantiation
(Actual
);
9455 if not Unknown_Discriminants_Present
(Formal
) then
9456 if Is_Constrained
(Ancestor
) then
9457 if not Is_Constrained
(Act_T
) then
9459 ("actual subtype must be constrained", Actual
);
9460 Abandon_Instantiation
(Actual
);
9463 -- Ancestor is unconstrained, Check if generic formal and actual
9464 -- agree on constrainedness. The check only applies to array types
9465 -- and discriminated types.
9467 elsif Is_Constrained
(Act_T
) then
9468 if Ekind
(Ancestor
) = E_Access_Type
9470 (not Is_Constrained
(A_Gen_T
)
9471 and then Is_Composite_Type
(A_Gen_T
))
9474 ("actual subtype must be unconstrained", Actual
);
9475 Abandon_Instantiation
(Actual
);
9478 -- A class-wide type is only allowed if the formal has unknown
9481 elsif Is_Class_Wide_Type
(Act_T
)
9482 and then not Has_Unknown_Discriminants
(Ancestor
)
9485 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
9486 Abandon_Instantiation
(Actual
);
9488 -- Otherwise, the formal and actual shall have the same number
9489 -- of discriminants and each discriminant of the actual must
9490 -- correspond to a discriminant of the formal.
9492 elsif Has_Discriminants
(Act_T
)
9493 and then not Has_Unknown_Discriminants
(Act_T
)
9494 and then Has_Discriminants
(Ancestor
)
9496 Actual_Discr
:= First_Discriminant
(Act_T
);
9497 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
9498 while Present
(Actual_Discr
)
9499 and then Present
(Ancestor_Discr
)
9501 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
9502 No
(Corresponding_Discriminant
(Actual_Discr
))
9505 ("discriminant & does not correspond " &
9506 "to ancestor discriminant", Actual
, Actual_Discr
);
9507 Abandon_Instantiation
(Actual
);
9510 Next_Discriminant
(Actual_Discr
);
9511 Next_Discriminant
(Ancestor_Discr
);
9514 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
9516 ("actual for & must have same number of discriminants",
9518 Abandon_Instantiation
(Actual
);
9521 -- This case should be caught by the earlier check for for
9522 -- constrainedness, but the check here is added for completeness.
9524 elsif Has_Discriminants
(Act_T
)
9525 and then not Has_Unknown_Discriminants
(Act_T
)
9528 ("actual for & must not have discriminants", Actual
, Gen_T
);
9529 Abandon_Instantiation
(Actual
);
9531 elsif Has_Discriminants
(Ancestor
) then
9533 ("actual for & must have known discriminants", Actual
, Gen_T
);
9534 Abandon_Instantiation
(Actual
);
9537 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
9539 ("constraint on actual is incompatible with formal", Actual
);
9540 Abandon_Instantiation
(Actual
);
9544 -- If the formal and actual types are abstract, check that there
9545 -- are no abstract primitives of the actual type that correspond to
9546 -- nonabstract primitives of the formal type (second sentence of
9549 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
9550 Check_Abstract_Primitives
: declare
9551 Gen_Prims
: constant Elist_Id
:=
9552 Primitive_Operations
(A_Gen_T
);
9554 Gen_Subp
: Entity_Id
;
9555 Anc_Subp
: Entity_Id
;
9556 Anc_Formal
: Entity_Id
;
9557 Anc_F_Type
: Entity_Id
;
9559 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
9561 Act_Subp
: Entity_Id
;
9562 Act_Formal
: Entity_Id
;
9563 Act_F_Type
: Entity_Id
;
9565 Subprograms_Correspond
: Boolean;
9567 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
9568 -- Returns true if T2 is derived directly or indirectly from
9569 -- T1, including derivations from interfaces. T1 and T2 are
9570 -- required to be specific tagged base types.
9572 ------------------------
9573 -- Is_Tagged_Ancestor --
9574 ------------------------
9576 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
9578 Intfc_Elmt
: Elmt_Id
;
9581 -- The predicate is satisfied if the types are the same
9586 -- If we've reached the top of the derivation chain then
9587 -- we know that T1 is not an ancestor of T2.
9589 elsif Etype
(T2
) = T2
then
9592 -- Proceed to check T2's immediate parent
9594 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
9597 -- Finally, check to see if T1 is an ancestor of any of T2's
9601 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
9602 while Present
(Intfc_Elmt
) loop
9603 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
9607 Next_Elmt
(Intfc_Elmt
);
9612 end Is_Tagged_Ancestor
;
9614 -- Start of processing for Check_Abstract_Primitives
9617 -- Loop over all of the formal derived type's primitives
9619 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
9620 while Present
(Gen_Elmt
) loop
9621 Gen_Subp
:= Node
(Gen_Elmt
);
9623 -- If the primitive of the formal is not abstract, then
9624 -- determine whether there is a corresponding primitive of
9625 -- the actual type that's abstract.
9627 if not Is_Abstract_Subprogram
(Gen_Subp
) then
9628 Act_Elmt
:= First_Elmt
(Act_Prims
);
9629 while Present
(Act_Elmt
) loop
9630 Act_Subp
:= Node
(Act_Elmt
);
9632 -- If we find an abstract primitive of the actual,
9633 -- then we need to test whether it corresponds to the
9634 -- subprogram from which the generic formal primitive
9637 if Is_Abstract_Subprogram
(Act_Subp
) then
9638 Anc_Subp
:= Alias
(Gen_Subp
);
9640 -- Test whether we have a corresponding primitive
9641 -- by comparing names, kinds, formal types, and
9644 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
9645 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
9647 Anc_Formal
:= First_Formal
(Anc_Subp
);
9648 Act_Formal
:= First_Formal
(Act_Subp
);
9649 while Present
(Anc_Formal
)
9650 and then Present
(Act_Formal
)
9652 Anc_F_Type
:= Etype
(Anc_Formal
);
9653 Act_F_Type
:= Etype
(Act_Formal
);
9655 if Ekind
(Anc_F_Type
)
9656 = E_Anonymous_Access_Type
9658 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
9660 if Ekind
(Act_F_Type
)
9661 = E_Anonymous_Access_Type
9664 Designated_Type
(Act_F_Type
);
9670 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
9675 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
9676 Act_F_Type
:= Base_Type
(Act_F_Type
);
9678 -- If the formal is controlling, then the
9679 -- the type of the actual primitive's formal
9680 -- must be derived directly or indirectly
9681 -- from the type of the ancestor primitive's
9684 if Is_Controlling_Formal
(Anc_Formal
) then
9685 if not Is_Tagged_Ancestor
9686 (Anc_F_Type
, Act_F_Type
)
9691 -- Otherwise the types of the formals must
9694 elsif Anc_F_Type
/= Act_F_Type
then
9698 Next_Entity
(Anc_Formal
);
9699 Next_Entity
(Act_Formal
);
9702 -- If we traversed through all of the formals
9703 -- then so far the subprograms correspond, so
9704 -- now check that any result types correspond.
9707 and then No
(Act_Formal
)
9709 Subprograms_Correspond
:= True;
9711 if Ekind
(Act_Subp
) = E_Function
then
9712 Anc_F_Type
:= Etype
(Anc_Subp
);
9713 Act_F_Type
:= Etype
(Act_Subp
);
9715 if Ekind
(Anc_F_Type
)
9716 = E_Anonymous_Access_Type
9719 Designated_Type
(Anc_F_Type
);
9721 if Ekind
(Act_F_Type
)
9722 = E_Anonymous_Access_Type
9725 Designated_Type
(Act_F_Type
);
9727 Subprograms_Correspond
:= False;
9732 = E_Anonymous_Access_Type
9734 Subprograms_Correspond
:= False;
9737 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
9738 Act_F_Type
:= Base_Type
(Act_F_Type
);
9740 -- Now either the result types must be
9741 -- the same or, if the result type is
9742 -- controlling, the result type of the
9743 -- actual primitive must descend from the
9744 -- result type of the ancestor primitive.
9746 if Subprograms_Correspond
9747 and then Anc_F_Type
/= Act_F_Type
9749 Has_Controlling_Result
(Anc_Subp
)
9751 not Is_Tagged_Ancestor
9752 (Anc_F_Type
, Act_F_Type
)
9754 Subprograms_Correspond
:= False;
9758 -- Found a matching subprogram belonging to
9759 -- formal ancestor type, so actual subprogram
9760 -- corresponds and this violates 3.9.3(9).
9762 if Subprograms_Correspond
then
9764 ("abstract subprogram & overrides " &
9765 "nonabstract subprogram of ancestor",
9773 Next_Elmt
(Act_Elmt
);
9777 Next_Elmt
(Gen_Elmt
);
9779 end Check_Abstract_Primitives
;
9782 -- Verify that limitedness matches. If parent is a limited
9783 -- interface then the generic formal is not unless declared
9784 -- explicitly so. If not declared limited, the actual cannot be
9785 -- limited (see AI05-0087).
9786 -- Disable check for now, limited interfaces implemented by
9787 -- protected types are common, Need to update tests ???
9789 if Is_Limited_Type
(Act_T
)
9790 and then not Is_Limited_Type
(A_Gen_T
)
9794 ("actual for non-limited & cannot be a limited type", Actual
,
9796 Explain_Limited_Type
(Act_T
, Actual
);
9797 Abandon_Instantiation
(Actual
);
9799 end Validate_Derived_Type_Instance
;
9801 --------------------------------------
9802 -- Validate_Interface_Type_Instance --
9803 --------------------------------------
9805 procedure Validate_Interface_Type_Instance
is
9807 if not Is_Interface
(Act_T
) then
9809 ("actual for formal interface type must be an interface",
9812 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
9814 Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
9816 Is_Protected_Interface
(A_Gen_T
) /=
9817 Is_Protected_Interface
(Act_T
)
9819 Is_Synchronized_Interface
(A_Gen_T
) /=
9820 Is_Synchronized_Interface
(Act_T
)
9823 ("actual for interface& does not match (RM 12.5.5(4))",
9826 end Validate_Interface_Type_Instance
;
9828 ------------------------------------
9829 -- Validate_Private_Type_Instance --
9830 ------------------------------------
9832 procedure Validate_Private_Type_Instance
is
9833 Formal_Discr
: Entity_Id
;
9834 Actual_Discr
: Entity_Id
;
9835 Formal_Subt
: Entity_Id
;
9838 if Is_Limited_Type
(Act_T
)
9839 and then not Is_Limited_Type
(A_Gen_T
)
9842 ("actual for non-limited & cannot be a limited type", Actual
,
9844 Explain_Limited_Type
(Act_T
, Actual
);
9845 Abandon_Instantiation
(Actual
);
9847 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
9848 and then not Has_Preelaborable_Initialization
(Act_T
)
9851 ("actual for & must have preelaborable initialization", Actual
,
9854 elsif Is_Indefinite_Subtype
(Act_T
)
9855 and then not Is_Indefinite_Subtype
(A_Gen_T
)
9856 and then Ada_Version
>= Ada_95
9859 ("actual for & must be a definite subtype", Actual
, Gen_T
);
9861 elsif not Is_Tagged_Type
(Act_T
)
9862 and then Is_Tagged_Type
(A_Gen_T
)
9865 ("actual for & must be a tagged type", Actual
, Gen_T
);
9867 elsif Has_Discriminants
(A_Gen_T
) then
9868 if not Has_Discriminants
(Act_T
) then
9870 ("actual for & must have discriminants", Actual
, Gen_T
);
9871 Abandon_Instantiation
(Actual
);
9873 elsif Is_Constrained
(Act_T
) then
9875 ("actual for & must be unconstrained", Actual
, Gen_T
);
9876 Abandon_Instantiation
(Actual
);
9879 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
9880 Actual_Discr
:= First_Discriminant
(Act_T
);
9881 while Formal_Discr
/= Empty
loop
9882 if Actual_Discr
= Empty
then
9884 ("discriminants on actual do not match formal",
9886 Abandon_Instantiation
(Actual
);
9889 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
9891 -- Access discriminants match if designated types do
9893 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
9894 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
9895 E_Anonymous_Access_Type
9898 (Designated_Type
(Base_Type
(Formal_Subt
))) =
9899 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
9903 elsif Base_Type
(Formal_Subt
) /=
9904 Base_Type
(Etype
(Actual_Discr
))
9907 ("types of actual discriminants must match formal",
9909 Abandon_Instantiation
(Actual
);
9911 elsif not Subtypes_Statically_Match
9912 (Formal_Subt
, Etype
(Actual_Discr
))
9913 and then Ada_Version
>= Ada_95
9916 ("subtypes of actual discriminants must match formal",
9918 Abandon_Instantiation
(Actual
);
9921 Next_Discriminant
(Formal_Discr
);
9922 Next_Discriminant
(Actual_Discr
);
9925 if Actual_Discr
/= Empty
then
9927 ("discriminants on actual do not match formal",
9929 Abandon_Instantiation
(Actual
);
9936 end Validate_Private_Type_Instance
;
9938 -- Start of processing for Instantiate_Type
9941 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
9942 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
9943 return New_List
(Error
);
9945 elsif not Is_Entity_Name
(Actual
)
9946 or else not Is_Type
(Entity
(Actual
))
9949 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
9950 Abandon_Instantiation
(Actual
);
9953 Act_T
:= Entity
(Actual
);
9955 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
9956 -- as a generic actual parameter if the corresponding formal type
9957 -- does not have a known_discriminant_part, or is a formal derived
9958 -- type that is an Unchecked_Union type.
9960 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
9961 if not Has_Discriminants
(A_Gen_T
)
9963 (Is_Derived_Type
(A_Gen_T
)
9965 Is_Unchecked_Union
(A_Gen_T
))
9969 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
9970 " discriminated formal type", Act_T
);
9975 -- Deal with fixed/floating restrictions
9977 if Is_Floating_Point_Type
(Act_T
) then
9978 Check_Restriction
(No_Floating_Point
, Actual
);
9979 elsif Is_Fixed_Point_Type
(Act_T
) then
9980 Check_Restriction
(No_Fixed_Point
, Actual
);
9983 -- Deal with error of using incomplete type as generic actual.
9984 -- This includes limited views of a type, even if the non-limited
9985 -- view may be available.
9987 if Ekind
(Act_T
) = E_Incomplete_Type
9988 or else (Is_Class_Wide_Type
(Act_T
)
9990 Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
9992 if Is_Class_Wide_Type
(Act_T
)
9993 or else No
(Full_View
(Act_T
))
9995 Error_Msg_N
("premature use of incomplete type", Actual
);
9996 Abandon_Instantiation
(Actual
);
9998 Act_T
:= Full_View
(Act_T
);
9999 Set_Entity
(Actual
, Act_T
);
10001 if Has_Private_Component
(Act_T
) then
10003 ("premature use of type with private component", Actual
);
10007 -- Deal with error of premature use of private type as generic actual
10009 elsif Is_Private_Type
(Act_T
)
10010 and then Is_Private_Type
(Base_Type
(Act_T
))
10011 and then not Is_Generic_Type
(Act_T
)
10012 and then not Is_Derived_Type
(Act_T
)
10013 and then No
(Full_View
(Root_Type
(Act_T
)))
10015 Error_Msg_N
("premature use of private type", Actual
);
10017 elsif Has_Private_Component
(Act_T
) then
10019 ("premature use of type with private component", Actual
);
10022 Set_Instance_Of
(A_Gen_T
, Act_T
);
10024 -- If the type is generic, the class-wide type may also be used
10026 if Is_Tagged_Type
(A_Gen_T
)
10027 and then Is_Tagged_Type
(Act_T
)
10028 and then not Is_Class_Wide_Type
(A_Gen_T
)
10030 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
10031 Class_Wide_Type
(Act_T
));
10034 if not Is_Abstract_Type
(A_Gen_T
)
10035 and then Is_Abstract_Type
(Act_T
)
10038 ("actual of non-abstract formal cannot be abstract", Actual
);
10041 -- A generic scalar type is a first subtype for which we generate
10042 -- an anonymous base type. Indicate that the instance of this base
10043 -- is the base type of the actual.
10045 if Is_Scalar_Type
(A_Gen_T
) then
10046 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
10050 if Error_Posted
(Act_T
) then
10053 case Nkind
(Def
) is
10054 when N_Formal_Private_Type_Definition
=>
10055 Validate_Private_Type_Instance
;
10057 when N_Formal_Derived_Type_Definition
=>
10058 Validate_Derived_Type_Instance
;
10060 when N_Formal_Discrete_Type_Definition
=>
10061 if not Is_Discrete_Type
(Act_T
) then
10063 ("expect discrete type in instantiation of&",
10065 Abandon_Instantiation
(Actual
);
10068 when N_Formal_Signed_Integer_Type_Definition
=>
10069 if not Is_Signed_Integer_Type
(Act_T
) then
10071 ("expect signed integer type in instantiation of&",
10073 Abandon_Instantiation
(Actual
);
10076 when N_Formal_Modular_Type_Definition
=>
10077 if not Is_Modular_Integer_Type
(Act_T
) then
10079 ("expect modular type in instantiation of &",
10081 Abandon_Instantiation
(Actual
);
10084 when N_Formal_Floating_Point_Definition
=>
10085 if not Is_Floating_Point_Type
(Act_T
) then
10087 ("expect float type in instantiation of &", Actual
, Gen_T
);
10088 Abandon_Instantiation
(Actual
);
10091 when N_Formal_Ordinary_Fixed_Point_Definition
=>
10092 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
10094 ("expect ordinary fixed point type in instantiation of &",
10096 Abandon_Instantiation
(Actual
);
10099 when N_Formal_Decimal_Fixed_Point_Definition
=>
10100 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
10102 ("expect decimal type in instantiation of &",
10104 Abandon_Instantiation
(Actual
);
10107 when N_Array_Type_Definition
=>
10108 Validate_Array_Type_Instance
;
10110 when N_Access_To_Object_Definition
=>
10111 Validate_Access_Type_Instance
;
10113 when N_Access_Function_Definition |
10114 N_Access_Procedure_Definition
=>
10115 Validate_Access_Subprogram_Instance
;
10117 when N_Record_Definition
=>
10118 Validate_Interface_Type_Instance
;
10120 when N_Derived_Type_Definition
=>
10121 Validate_Derived_Interface_Type_Instance
;
10124 raise Program_Error
;
10129 Subt
:= New_Copy
(Gen_T
);
10131 -- Use adjusted sloc of subtype name as the location for other nodes in
10132 -- the subtype declaration.
10134 Loc
:= Sloc
(Subt
);
10137 Make_Subtype_Declaration
(Loc
,
10138 Defining_Identifier
=> Subt
,
10139 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
10141 if Is_Private_Type
(Act_T
) then
10142 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10144 elsif Is_Access_Type
(Act_T
)
10145 and then Is_Private_Type
(Designated_Type
(Act_T
))
10147 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10150 Decl_Nodes
:= New_List
(Decl_Node
);
10152 -- Flag actual derived types so their elaboration produces the
10153 -- appropriate renamings for the primitive operations of the ancestor.
10154 -- Flag actual for formal private types as well, to determine whether
10155 -- operations in the private part may override inherited operations.
10156 -- If the formal has an interface list, the ancestor is not the
10157 -- parent, but the analyzed formal that includes the interface
10158 -- operations of all its progenitors.
10160 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
10161 if Present
(Interface_List
(Def
)) then
10162 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
10164 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
10167 elsif Nkind
(Def
) = N_Formal_Private_Type_Definition
then
10168 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
10171 -- If the actual is a synchronized type that implements an interface,
10172 -- the primitive operations are attached to the corresponding record,
10173 -- and we have to treat it as an additional generic actual, so that its
10174 -- primitive operations become visible in the instance. The task or
10175 -- protected type itself does not carry primitive operations.
10177 if Is_Concurrent_Type
(Act_T
)
10178 and then Is_Tagged_Type
(Act_T
)
10179 and then Present
(Corresponding_Record_Type
(Act_T
))
10180 and then Present
(Ancestor
)
10181 and then Is_Interface
(Ancestor
)
10184 Corr_Rec
: constant Entity_Id
:=
10185 Corresponding_Record_Type
(Act_T
);
10186 New_Corr
: Entity_Id
;
10187 Corr_Decl
: Node_Id
;
10190 New_Corr
:= Make_Defining_Identifier
(Loc
,
10191 Chars
=> New_Internal_Name
('S'));
10193 Make_Subtype_Declaration
(Loc
,
10194 Defining_Identifier
=> New_Corr
,
10195 Subtype_Indication
=>
10196 New_Reference_To
(Corr_Rec
, Loc
));
10197 Append_To
(Decl_Nodes
, Corr_Decl
);
10199 if Ekind
(Act_T
) = E_Task_Type
then
10200 Set_Ekind
(Subt
, E_Task_Subtype
);
10202 Set_Ekind
(Subt
, E_Protected_Subtype
);
10205 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
10206 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
10207 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
10212 end Instantiate_Type
;
10214 -----------------------
10215 -- Is_Generic_Formal --
10216 -----------------------
10218 function Is_Generic_Formal
(E
: Entity_Id
) return Boolean is
10224 Kind
:= Nkind
(Parent
(E
));
10226 Nkind_In
(Kind
, N_Formal_Object_Declaration
,
10227 N_Formal_Package_Declaration
,
10228 N_Formal_Type_Declaration
)
10230 (Is_Formal_Subprogram
(E
)
10232 Nkind
(Parent
(Parent
(E
))) in
10233 N_Formal_Subprogram_Declaration
);
10235 end Is_Generic_Formal
;
10237 ---------------------
10238 -- Is_In_Main_Unit --
10239 ---------------------
10241 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
10242 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
10243 Current_Unit
: Node_Id
;
10246 if Unum
= Main_Unit
then
10249 -- If the current unit is a subunit then it is either the main unit or
10250 -- is being compiled as part of the main unit.
10252 elsif Nkind
(N
) = N_Compilation_Unit
then
10253 return Nkind
(Unit
(N
)) = N_Subunit
;
10256 Current_Unit
:= Parent
(N
);
10257 while Present
(Current_Unit
)
10258 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
10260 Current_Unit
:= Parent
(Current_Unit
);
10263 -- The instantiation node is in the main unit, or else the current node
10264 -- (perhaps as the result of nested instantiations) is in the main unit,
10265 -- or in the declaration of the main unit, which in this last case must
10268 return Unum
= Main_Unit
10269 or else Current_Unit
= Cunit
(Main_Unit
)
10270 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
10271 or else (Present
(Library_Unit
(Current_Unit
))
10272 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
10273 end Is_In_Main_Unit
;
10275 ----------------------------
10276 -- Load_Parent_Of_Generic --
10277 ----------------------------
10279 procedure Load_Parent_Of_Generic
10282 Body_Optional
: Boolean := False)
10284 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
10285 Save_Style_Check
: constant Boolean := Style_Check
;
10286 True_Parent
: Node_Id
;
10287 Inst_Node
: Node_Id
;
10289 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
10291 procedure Collect_Previous_Instances
(Decls
: List_Id
);
10292 -- Collect all instantiations in the given list of declarations, that
10293 -- precede the generic that we need to load. If the bodies of these
10294 -- instantiations are available, we must analyze them, to ensure that
10295 -- the public symbols generated are the same when the unit is compiled
10296 -- to generate code, and when it is compiled in the context of a unit
10297 -- that needs a particular nested instance. This process is applied
10298 -- to both package and subprogram instances.
10300 --------------------------------
10301 -- Collect_Previous_Instances --
10302 --------------------------------
10304 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
10308 Decl
:= First
(Decls
);
10309 while Present
(Decl
) loop
10310 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
10313 -- If Decl is an instantiation, then record it as requiring
10314 -- instantiation of the corresponding body, except if it is an
10315 -- abbreviated instantiation generated internally for conformance
10316 -- checking purposes only for the case of a formal package
10317 -- declared without a box (see Instantiate_Formal_Package). Such
10318 -- an instantiation does not generate any code (the actual code
10319 -- comes from actual) and thus does not need to be analyzed here.
10321 elsif Nkind
(Decl
) = N_Package_Instantiation
10322 and then not Is_Internal
(Defining_Entity
(Decl
))
10324 Append_Elmt
(Decl
, Previous_Instances
);
10326 -- For a subprogram instantiation, omit instantiations of
10327 -- intrinsic operations (Unchecked_Conversions, etc.) that
10330 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
10331 N_Procedure_Instantiation
)
10332 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
10334 Append_Elmt
(Decl
, Previous_Instances
);
10336 elsif Nkind
(Decl
) = N_Package_Declaration
then
10337 Collect_Previous_Instances
10338 (Visible_Declarations
(Specification
(Decl
)));
10339 Collect_Previous_Instances
10340 (Private_Declarations
(Specification
(Decl
)));
10342 elsif Nkind
(Decl
) = N_Package_Body
then
10343 Collect_Previous_Instances
(Declarations
(Decl
));
10348 end Collect_Previous_Instances
;
10350 -- Start of processing for Load_Parent_Of_Generic
10353 if not In_Same_Source_Unit
(N
, Spec
)
10354 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
10355 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
10356 and then not Is_In_Main_Unit
(Spec
))
10358 -- Find body of parent of spec, and analyze it. A special case arises
10359 -- when the parent is an instantiation, that is to say when we are
10360 -- currently instantiating a nested generic. In that case, there is
10361 -- no separate file for the body of the enclosing instance. Instead,
10362 -- the enclosing body must be instantiated as if it were a pending
10363 -- instantiation, in order to produce the body for the nested generic
10364 -- we require now. Note that in that case the generic may be defined
10365 -- in a package body, the instance defined in the same package body,
10366 -- and the original enclosing body may not be in the main unit.
10368 Inst_Node
:= Empty
;
10370 True_Parent
:= Parent
(Spec
);
10371 while Present
(True_Parent
)
10372 and then Nkind
(True_Parent
) /= N_Compilation_Unit
10374 if Nkind
(True_Parent
) = N_Package_Declaration
10376 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
10378 -- Parent is a compilation unit that is an instantiation.
10379 -- Instantiation node has been replaced with package decl.
10381 Inst_Node
:= Original_Node
(True_Parent
);
10384 elsif Nkind
(True_Parent
) = N_Package_Declaration
10385 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
10386 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10388 -- Parent is an instantiation within another specification.
10389 -- Declaration for instance has been inserted before original
10390 -- instantiation node. A direct link would be preferable?
10392 Inst_Node
:= Next
(True_Parent
);
10393 while Present
(Inst_Node
)
10394 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
10399 -- If the instance appears within a generic, and the generic
10400 -- unit is defined within a formal package of the enclosing
10401 -- generic, there is no generic body available, and none
10402 -- needed. A more precise test should be used ???
10404 if No
(Inst_Node
) then
10411 True_Parent
:= Parent
(True_Parent
);
10415 -- Case where we are currently instantiating a nested generic
10417 if Present
(Inst_Node
) then
10418 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
10420 -- Instantiation node and declaration of instantiated package
10421 -- were exchanged when only the declaration was needed.
10422 -- Restore instantiation node before proceeding with body.
10424 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
10427 -- Now complete instantiation of enclosing body, if it appears
10428 -- in some other unit. If it appears in the current unit, the
10429 -- body will have been instantiated already.
10431 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
10433 -- We need to determine the expander mode to instantiate the
10434 -- enclosing body. Because the generic body we need may use
10435 -- global entities declared in the enclosing package (including
10436 -- aggregates) it is in general necessary to compile this body
10437 -- with expansion enabled. The exception is if we are within a
10438 -- generic package, in which case the usual generic rule
10442 Exp_Status
: Boolean := True;
10446 -- Loop through scopes looking for generic package
10448 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
10449 while Present
(Scop
)
10450 and then Scop
/= Standard_Standard
10452 if Ekind
(Scop
) = E_Generic_Package
then
10453 Exp_Status
:= False;
10457 Scop
:= Scope
(Scop
);
10460 -- Collect previous instantiations in the unit that
10461 -- contains the desired generic.
10463 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10464 and then not Body_Optional
10468 Info
: Pending_Body_Info
;
10472 Par
:= Parent
(Inst_Node
);
10473 while Present
(Par
) loop
10474 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
10475 Par
:= Parent
(Par
);
10478 pragma Assert
(Present
(Par
));
10480 if Nkind
(Par
) = N_Package_Body
then
10481 Collect_Previous_Instances
(Declarations
(Par
));
10483 elsif Nkind
(Par
) = N_Package_Declaration
then
10484 Collect_Previous_Instances
10485 (Visible_Declarations
(Specification
(Par
)));
10486 Collect_Previous_Instances
10487 (Private_Declarations
(Specification
(Par
)));
10490 -- Enclosing unit is a subprogram body, In this
10491 -- case all instance bodies are processed in order
10492 -- and there is no need to collect them separately.
10497 Decl
:= First_Elmt
(Previous_Instances
);
10498 while Present
(Decl
) loop
10500 (Inst_Node
=> Node
(Decl
),
10502 Instance_Spec
(Node
(Decl
)),
10503 Expander_Status
=> Exp_Status
,
10504 Current_Sem_Unit
=>
10505 Get_Code_Unit
(Sloc
(Node
(Decl
))),
10506 Scope_Suppress
=> Scope_Suppress
,
10507 Local_Suppress_Stack_Top
=>
10508 Local_Suppress_Stack_Top
);
10510 -- Package instance
10513 Nkind
(Node
(Decl
)) = N_Package_Instantiation
10515 Instantiate_Package_Body
10516 (Info
, Body_Optional
=> True);
10518 -- Subprogram instance
10521 -- The instance_spec is the wrapper package,
10522 -- and the subprogram declaration is the last
10523 -- declaration in the wrapper.
10527 (Visible_Declarations
10528 (Specification
(Info
.Act_Decl
)));
10530 Instantiate_Subprogram_Body
10531 (Info
, Body_Optional
=> True);
10539 Instantiate_Package_Body
10541 ((Inst_Node
=> Inst_Node
,
10542 Act_Decl
=> True_Parent
,
10543 Expander_Status
=> Exp_Status
,
10544 Current_Sem_Unit
=>
10545 Get_Code_Unit
(Sloc
(Inst_Node
)),
10546 Scope_Suppress
=> Scope_Suppress
,
10547 Local_Suppress_Stack_Top
=>
10548 Local_Suppress_Stack_Top
)),
10549 Body_Optional
=> Body_Optional
);
10553 -- Case where we are not instantiating a nested generic
10556 Opt
.Style_Check
:= False;
10557 Expander_Mode_Save_And_Set
(True);
10558 Load_Needed_Body
(Comp_Unit
, OK
);
10559 Opt
.Style_Check
:= Save_Style_Check
;
10560 Expander_Mode_Restore
;
10563 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
10564 and then not Body_Optional
10567 Bname
: constant Unit_Name_Type
:=
10568 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
10571 Error_Msg_Unit_1
:= Bname
;
10572 Error_Msg_N
("this instantiation requires$!", N
);
10573 Error_Msg_File_1
:= Get_File_Name
(Bname
, Subunit
=> False);
10574 Error_Msg_N
("\but file{ was not found!", N
);
10575 raise Unrecoverable_Error
;
10581 -- If loading parent of the generic caused an instantiation circularity,
10582 -- we abandon compilation at this point, because otherwise in some cases
10583 -- we get into trouble with infinite recursions after this point.
10585 if Circularity_Detected
then
10586 raise Unrecoverable_Error
;
10588 end Load_Parent_Of_Generic
;
10590 -----------------------
10591 -- Move_Freeze_Nodes --
10592 -----------------------
10594 procedure Move_Freeze_Nodes
10595 (Out_Of
: Entity_Id
;
10600 Next_Decl
: Node_Id
;
10601 Next_Node
: Node_Id
:= After
;
10604 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
10605 -- Check whether entity is declared in a scope external to that
10606 -- of the generic unit.
10608 -------------------
10609 -- Is_Outer_Type --
10610 -------------------
10612 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
10613 Scop
: Entity_Id
:= Scope
(T
);
10616 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
10620 while Scop
/= Standard_Standard
loop
10621 if Scop
= Out_Of
then
10624 Scop
:= Scope
(Scop
);
10632 -- Start of processing for Move_Freeze_Nodes
10639 -- First remove the freeze nodes that may appear before all other
10643 while Present
(Decl
)
10644 and then Nkind
(Decl
) = N_Freeze_Entity
10645 and then Is_Outer_Type
(Entity
(Decl
))
10647 Decl
:= Remove_Head
(L
);
10648 Insert_After
(Next_Node
, Decl
);
10649 Set_Analyzed
(Decl
, False);
10654 -- Next scan the list of declarations and remove each freeze node that
10655 -- appears ahead of the current node.
10657 while Present
(Decl
) loop
10658 while Present
(Next
(Decl
))
10659 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
10660 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
10662 Next_Decl
:= Remove_Next
(Decl
);
10663 Insert_After
(Next_Node
, Next_Decl
);
10664 Set_Analyzed
(Next_Decl
, False);
10665 Next_Node
:= Next_Decl
;
10668 -- If the declaration is a nested package or concurrent type, then
10669 -- recurse. Nested generic packages will have been processed from the
10672 if Nkind
(Decl
) = N_Package_Declaration
then
10673 Spec
:= Specification
(Decl
);
10675 elsif Nkind
(Decl
) = N_Task_Type_Declaration
then
10676 Spec
:= Task_Definition
(Decl
);
10678 elsif Nkind
(Decl
) = N_Protected_Type_Declaration
then
10679 Spec
:= Protected_Definition
(Decl
);
10685 if Present
(Spec
) then
10686 Move_Freeze_Nodes
(Out_Of
, Next_Node
,
10687 Visible_Declarations
(Spec
));
10688 Move_Freeze_Nodes
(Out_Of
, Next_Node
,
10689 Private_Declarations
(Spec
));
10694 end Move_Freeze_Nodes
;
10700 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
10702 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
10705 ------------------------
10706 -- Preanalyze_Actuals --
10707 ------------------------
10709 procedure Preanalyze_Actuals
(N
: Node_Id
) is
10712 Errs
: constant Int
:= Serious_Errors_Detected
;
10715 Assoc
:= First
(Generic_Associations
(N
));
10716 while Present
(Assoc
) loop
10717 if Nkind
(Assoc
) /= N_Others_Choice
then
10718 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
10720 -- Within a nested instantiation, a defaulted actual is an empty
10721 -- association, so nothing to analyze. If the subprogram actual
10722 -- is an attribute, analyze prefix only, because actual is not a
10723 -- complete attribute reference.
10725 -- If actual is an allocator, analyze expression only. The full
10726 -- analysis can generate code, and if instance is a compilation
10727 -- unit we have to wait until the package instance is installed
10728 -- to have a proper place to insert this code.
10730 -- String literals may be operators, but at this point we do not
10731 -- know whether the actual is a formal subprogram or a string.
10736 elsif Nkind
(Act
) = N_Attribute_Reference
then
10737 Analyze
(Prefix
(Act
));
10739 elsif Nkind
(Act
) = N_Explicit_Dereference
then
10740 Analyze
(Prefix
(Act
));
10742 elsif Nkind
(Act
) = N_Allocator
then
10744 Expr
: constant Node_Id
:= Expression
(Act
);
10747 if Nkind
(Expr
) = N_Subtype_Indication
then
10748 Analyze
(Subtype_Mark
(Expr
));
10750 -- Analyze separately each discriminant constraint,
10751 -- when given with a named association.
10757 Constr
:= First
(Constraints
(Constraint
(Expr
)));
10758 while Present
(Constr
) loop
10759 if Nkind
(Constr
) = N_Discriminant_Association
then
10760 Analyze
(Expression
(Constr
));
10774 elsif Nkind
(Act
) /= N_Operator_Symbol
then
10778 if Errs
/= Serious_Errors_Detected
then
10780 -- Do a minimal analysis of the generic, to prevent spurious
10781 -- warnings complaining about the generic being unreferenced,
10782 -- before abandoning the instantiation.
10784 Analyze
(Name
(N
));
10786 if Is_Entity_Name
(Name
(N
))
10787 and then Etype
(Name
(N
)) /= Any_Type
10789 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
10790 Set_Is_Instantiated
(Entity
(Name
(N
)));
10793 Abandon_Instantiation
(Act
);
10799 end Preanalyze_Actuals
;
10801 -------------------
10802 -- Remove_Parent --
10803 -------------------
10805 procedure Remove_Parent
(In_Body
: Boolean := False) is
10806 S
: Entity_Id
:= Current_Scope
;
10807 -- S is the scope containing the instantiation just completed. The
10808 -- scope stack contains the parent instances of the instantiation,
10809 -- followed by the original S.
10816 -- After child instantiation is complete, remove from scope stack the
10817 -- extra copy of the current scope, and then remove parent instances.
10819 if not In_Body
then
10822 while Current_Scope
/= S
loop
10823 P
:= Current_Scope
;
10824 End_Package_Scope
(Current_Scope
);
10826 if In_Open_Scopes
(P
) then
10827 E
:= First_Entity
(P
);
10828 while Present
(E
) loop
10829 Set_Is_Immediately_Visible
(E
, True);
10833 if Is_Generic_Instance
(Current_Scope
)
10834 and then P
/= Current_Scope
10836 -- We are within an instance of some sibling. Retain
10837 -- visibility of parent, for proper subsequent cleanup,
10838 -- and reinstall private declarations as well.
10840 Set_In_Private_Part
(P
);
10841 Install_Private_Declarations
(P
);
10844 -- If the ultimate parent is a top-level unit recorded in
10845 -- Instance_Parent_Unit, then reset its visibility to what
10846 -- it was before instantiation. (It's not clear what the
10847 -- purpose is of testing whether Scope (P) is In_Open_Scopes,
10848 -- but that test was present before the ultimate parent test
10851 elsif not In_Open_Scopes
(Scope
(P
))
10852 or else (P
= Instance_Parent_Unit
10853 and then not Parent_Unit_Visible
)
10855 Set_Is_Immediately_Visible
(P
, False);
10857 -- If the current scope is itself an instantiation of a generic
10858 -- nested within P, and we are in the private part of body of
10859 -- this instantiation, restore the full views of P, that were
10860 -- removed in End_Package_Scope above. This obscure case can
10861 -- occur when a subunit of a generic contains an instance of
10862 -- of a child unit of its generic parent unit.
10864 elsif S
= Current_Scope
10865 and then Is_Generic_Instance
(S
)
10868 Par
: constant Entity_Id
:=
10870 (Specification
(Unit_Declaration_Node
(S
)));
10873 and then P
= Scope
(Par
)
10874 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
10876 Set_In_Private_Part
(P
);
10877 Install_Private_Declarations
(P
);
10883 -- Reset visibility of entities in the enclosing scope
10885 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
10887 Hidden
:= First_Elmt
(Hidden_Entities
);
10888 while Present
(Hidden
) loop
10889 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
10890 Next_Elmt
(Hidden
);
10894 -- Each body is analyzed separately, and there is no context
10895 -- that needs preserving from one body instance to the next,
10896 -- so remove all parent scopes that have been installed.
10898 while Present
(S
) loop
10899 End_Package_Scope
(S
);
10900 Set_Is_Immediately_Visible
(S
, False);
10901 S
:= Current_Scope
;
10902 exit when S
= Standard_Standard
;
10911 procedure Restore_Env
is
10912 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
10915 if No
(Current_Instantiated_Parent
.Act_Id
) then
10917 -- Restore environment after subprogram inlining
10919 Restore_Private_Views
(Empty
);
10922 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
10923 Exchanged_Views
:= Saved
.Exchanged_Views
;
10924 Hidden_Entities
:= Saved
.Hidden_Entities
;
10925 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
10926 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
10927 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
10929 Restore_Opt_Config_Switches
(Saved
.Switches
);
10931 Instance_Envs
.Decrement_Last
;
10934 ---------------------------
10935 -- Restore_Private_Views --
10936 ---------------------------
10938 procedure Restore_Private_Views
10939 (Pack_Id
: Entity_Id
;
10940 Is_Package
: Boolean := True)
10945 Dep_Elmt
: Elmt_Id
;
10948 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
10949 -- Hide the generic formals of formal packages declared with box
10950 -- which were reachable in the current instantiation.
10952 ---------------------------
10953 -- Restore_Nested_Formal --
10954 ---------------------------
10956 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
10960 if Present
(Renamed_Object
(Formal
))
10961 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
10965 elsif Present
(Associated_Formal_Package
(Formal
)) then
10966 Ent
:= First_Entity
(Formal
);
10967 while Present
(Ent
) loop
10968 exit when Ekind
(Ent
) = E_Package
10969 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10971 Set_Is_Hidden
(Ent
);
10972 Set_Is_Potentially_Use_Visible
(Ent
, False);
10974 -- If package, then recurse
10976 if Ekind
(Ent
) = E_Package
then
10977 Restore_Nested_Formal
(Ent
);
10983 end Restore_Nested_Formal
;
10985 -- Start of processing for Restore_Private_Views
10988 M
:= First_Elmt
(Exchanged_Views
);
10989 while Present
(M
) loop
10992 -- Subtypes of types whose views have been exchanged, and that
10993 -- are defined within the instance, were not on the list of
10994 -- Private_Dependents on entry to the instance, so they have to
10995 -- be exchanged explicitly now, in order to remain consistent with
10996 -- the view of the parent type.
10998 if Ekind
(Typ
) = E_Private_Type
10999 or else Ekind
(Typ
) = E_Limited_Private_Type
11000 or else Ekind
(Typ
) = E_Record_Type_With_Private
11002 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
11003 while Present
(Dep_Elmt
) loop
11004 Dep_Typ
:= Node
(Dep_Elmt
);
11006 if Scope
(Dep_Typ
) = Pack_Id
11007 and then Present
(Full_View
(Dep_Typ
))
11009 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
11010 Exchange_Declarations
(Dep_Typ
);
11013 Next_Elmt
(Dep_Elmt
);
11017 Exchange_Declarations
(Node
(M
));
11021 if No
(Pack_Id
) then
11025 -- Make the generic formal parameters private, and make the formal
11026 -- types into subtypes of the actuals again.
11028 E
:= First_Entity
(Pack_Id
);
11029 while Present
(E
) loop
11030 Set_Is_Hidden
(E
, True);
11033 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
11035 Set_Is_Generic_Actual_Type
(E
, False);
11037 -- An unusual case of aliasing: the actual may also be directly
11038 -- visible in the generic, and be private there, while it is fully
11039 -- visible in the context of the instance. The internal subtype
11040 -- is private in the instance, but has full visibility like its
11041 -- parent in the enclosing scope. This enforces the invariant that
11042 -- the privacy status of all private dependents of a type coincide
11043 -- with that of the parent type. This can only happen when a
11044 -- generic child unit is instantiated within sibling.
11046 if Is_Private_Type
(E
)
11047 and then not Is_Private_Type
(Etype
(E
))
11049 Exchange_Declarations
(E
);
11052 elsif Ekind
(E
) = E_Package
then
11054 -- The end of the renaming list is the renaming of the generic
11055 -- package itself. If the instance is a subprogram, all entities
11056 -- in the corresponding package are renamings. If this entity is
11057 -- a formal package, make its own formals private as well. The
11058 -- actual in this case is itself the renaming of an instantiation.
11059 -- If the entity is not a package renaming, it is the entity
11060 -- created to validate formal package actuals: ignore.
11062 -- If the actual is itself a formal package for the enclosing
11063 -- generic, or the actual for such a formal package, it remains
11064 -- visible on exit from the instance, and therefore nothing needs
11065 -- to be done either, except to keep it accessible.
11068 and then Renamed_Object
(E
) = Pack_Id
11072 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
11075 elsif Denotes_Formal_Package
(Renamed_Object
(E
), True) then
11076 Set_Is_Hidden
(E
, False);
11080 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
11084 Id
:= First_Entity
(Act_P
);
11086 and then Id
/= First_Private_Entity
(Act_P
)
11088 exit when Ekind
(Id
) = E_Package
11089 and then Renamed_Object
(Id
) = Act_P
;
11091 Set_Is_Hidden
(Id
, True);
11092 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
11094 if Ekind
(Id
) = E_Package
then
11095 Restore_Nested_Formal
(Id
);
11106 end Restore_Private_Views
;
11113 (Gen_Unit
: Entity_Id
;
11114 Act_Unit
: Entity_Id
)
11118 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
11121 ----------------------------
11122 -- Save_Global_References --
11123 ----------------------------
11125 procedure Save_Global_References
(N
: Node_Id
) is
11126 Gen_Scope
: Entity_Id
;
11130 function Is_Global
(E
: Entity_Id
) return Boolean;
11131 -- Check whether entity is defined outside of generic unit. Examine the
11132 -- scope of an entity, and the scope of the scope, etc, until we find
11133 -- either Standard, in which case the entity is global, or the generic
11134 -- unit itself, which indicates that the entity is local. If the entity
11135 -- is the generic unit itself, as in the case of a recursive call, or
11136 -- the enclosing generic unit, if different from the current scope, then
11137 -- it is local as well, because it will be replaced at the point of
11138 -- instantiation. On the other hand, if it is a reference to a child
11139 -- unit of a common ancestor, which appears in an instantiation, it is
11140 -- global because it is used to denote a specific compilation unit at
11141 -- the time the instantiations will be analyzed.
11143 procedure Reset_Entity
(N
: Node_Id
);
11144 -- Save semantic information on global entity, so that it is not
11145 -- resolved again at instantiation time.
11147 procedure Save_Entity_Descendants
(N
: Node_Id
);
11148 -- Apply Save_Global_References to the two syntactic descendants of
11149 -- non-terminal nodes that carry an Associated_Node and are processed
11150 -- through Reset_Entity. Once the global entity (if any) has been
11151 -- captured together with its type, only two syntactic descendants need
11152 -- to be traversed to complete the processing of the tree rooted at N.
11153 -- This applies to Selected_Components, Expanded_Names, and to Operator
11154 -- nodes. N can also be a character literal, identifier, or operator
11155 -- symbol node, but the call has no effect in these cases.
11157 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
11158 -- Default actuals in nested instances must be handled specially
11159 -- because there is no link to them from the original tree. When an
11160 -- actual subprogram is given by a default, we add an explicit generic
11161 -- association for it in the instantiation node. When we save the
11162 -- global references on the name of the instance, we recover the list
11163 -- of generic associations, and add an explicit one to the original
11164 -- generic tree, through which a global actual can be preserved.
11165 -- Similarly, if a child unit is instantiated within a sibling, in the
11166 -- context of the parent, we must preserve the identifier of the parent
11167 -- so that it can be properly resolved in a subsequent instantiation.
11169 procedure Save_Global_Descendant
(D
: Union_Id
);
11170 -- Apply Save_Global_References recursively to the descendents of the
11173 procedure Save_References
(N
: Node_Id
);
11174 -- This is the recursive procedure that does the work, once the
11175 -- enclosing generic scope has been established.
11181 function Is_Global
(E
: Entity_Id
) return Boolean is
11184 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
11185 -- Determine whether the parent node of a reference to a child unit
11186 -- denotes an instantiation or a formal package, in which case the
11187 -- reference to the child unit is global, even if it appears within
11188 -- the current scope (e.g. when the instance appears within the body
11189 -- of an ancestor).
11191 ----------------------
11192 -- Is_Instance_Node --
11193 ----------------------
11195 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
11197 return (Nkind
(Decl
) in N_Generic_Instantiation
11199 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
);
11200 end Is_Instance_Node
;
11202 -- Start of processing for Is_Global
11205 if E
= Gen_Scope
then
11208 elsif E
= Standard_Standard
then
11211 elsif Is_Child_Unit
(E
)
11212 and then (Is_Instance_Node
(Parent
(N2
))
11213 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
11214 and then N2
= Selector_Name
(Parent
(N2
))
11216 Is_Instance_Node
(Parent
(Parent
(N2
)))))
11222 while Se
/= Gen_Scope
loop
11223 if Se
= Standard_Standard
then
11238 procedure Reset_Entity
(N
: Node_Id
) is
11240 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
11241 -- If the type of N2 is global to the generic unit. Save
11242 -- the type in the generic node.
11244 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
11245 -- Find the ultimate ancestor of the current unit. If it is
11246 -- not a generic unit, then the name of the current unit
11247 -- in the prefix of an expanded name must be replaced with
11248 -- its generic homonym to ensure that it will be properly
11249 -- resolved in an instance.
11251 ---------------------
11252 -- Set_Global_Type --
11253 ---------------------
11255 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
11256 Typ
: constant Entity_Id
:= Etype
(N2
);
11259 Set_Etype
(N
, Typ
);
11261 if Entity
(N
) /= N2
11262 and then Has_Private_View
(Entity
(N
))
11264 -- If the entity of N is not the associated node, this is
11265 -- a nested generic and it has an associated node as well,
11266 -- whose type is already the full view (see below). Indicate
11267 -- that the original node has a private view.
11269 Set_Has_Private_View
(N
);
11272 -- If not a private type, nothing else to do
11274 if not Is_Private_Type
(Typ
) then
11275 if Is_Array_Type
(Typ
)
11276 and then Is_Private_Type
(Component_Type
(Typ
))
11278 Set_Has_Private_View
(N
);
11281 -- If it is a derivation of a private type in a context where
11282 -- no full view is needed, nothing to do either.
11284 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
11287 -- Otherwise mark the type for flipping and use the full_view
11291 Set_Has_Private_View
(N
);
11293 if Present
(Full_View
(Typ
)) then
11294 Set_Etype
(N2
, Full_View
(Typ
));
11297 end Set_Global_Type
;
11303 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
11308 while Is_Child_Unit
(Par
) loop
11309 Par
:= Scope
(Par
);
11315 -- Start of processing for Reset_Entity
11318 N2
:= Get_Associated_Node
(N
);
11321 if Present
(E
) then
11322 if Is_Global
(E
) then
11323 Set_Global_Type
(N
, N2
);
11325 elsif Nkind
(N
) = N_Op_Concat
11326 and then Is_Generic_Type
(Etype
(N2
))
11328 (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
11329 or else Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
11330 and then Is_Intrinsic_Subprogram
(E
)
11335 -- Entity is local. Mark generic node as unresolved.
11336 -- Note that now it does not have an entity.
11338 Set_Associated_Node
(N
, Empty
);
11339 Set_Etype
(N
, Empty
);
11342 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
11343 and then N
= Name
(Parent
(N
))
11345 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
11348 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11349 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
11351 if Is_Global
(Entity
(Parent
(N2
))) then
11352 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11353 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
11354 Set_Global_Type
(Parent
(N
), Parent
(N2
));
11355 Save_Entity_Descendants
(N
);
11357 -- If this is a reference to the current generic entity, replace
11358 -- by the name of the generic homonym of the current package. This
11359 -- is because in an instantiation Par.P.Q will not resolve to the
11360 -- name of the instance, whose enclosing scope is not necessarily
11361 -- Par. We use the generic homonym rather that the name of the
11362 -- generic itself, because it may be hidden by a local
11365 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
11367 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
11369 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
11370 Rewrite
(Parent
(N
),
11371 Make_Identifier
(Sloc
(N
),
11373 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
11375 Rewrite
(Parent
(N
),
11376 Make_Identifier
(Sloc
(N
),
11377 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
11381 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
11382 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
11384 Save_Global_Defaults
11385 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
11388 -- A selected component may denote a static constant that has been
11389 -- folded. If the static constant is global to the generic, capture
11390 -- its value. Otherwise the folding will happen in any instantiation,
11392 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11393 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
11395 if Present
(Entity
(Original_Node
(Parent
(N2
))))
11396 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
11398 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
11399 Set_Analyzed
(Parent
(N
), False);
11405 -- A selected component may be transformed into a parameterless
11406 -- function call. If the called entity is global, rewrite the node
11407 -- appropriately, i.e. as an extended name for the global entity.
11409 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11410 and then Nkind
(Parent
(N2
)) = N_Function_Call
11411 and then N
= Selector_Name
(Parent
(N
))
11413 if No
(Parameter_Associations
(Parent
(N2
))) then
11414 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
11415 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11416 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
11417 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
11418 Save_Entity_Descendants
(N
);
11421 Set_Associated_Node
(N
, Empty
);
11422 Set_Etype
(N
, Empty
);
11425 -- In Ada 2005, X.F may be a call to a primitive operation,
11426 -- rewritten as F (X). This rewriting will be done again in an
11427 -- instance, so keep the original node. Global entities will be
11428 -- captured as for other constructs.
11434 -- Entity is local. Reset in generic unit, so that node is resolved
11435 -- anew at the point of instantiation.
11438 Set_Associated_Node
(N
, Empty
);
11439 Set_Etype
(N
, Empty
);
11443 -----------------------------
11444 -- Save_Entity_Descendants --
11445 -----------------------------
11447 procedure Save_Entity_Descendants
(N
: Node_Id
) is
11450 when N_Binary_Op
=>
11451 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
11452 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11455 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11457 when N_Expanded_Name | N_Selected_Component
=>
11458 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
11459 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
11461 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
11465 raise Program_Error
;
11467 end Save_Entity_Descendants
;
11469 --------------------------
11470 -- Save_Global_Defaults --
11471 --------------------------
11473 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
11474 Loc
: constant Source_Ptr
:= Sloc
(N1
);
11475 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
11476 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
11483 Actual
: Entity_Id
;
11486 Assoc1
:= Generic_Associations
(N1
);
11488 if Present
(Assoc1
) then
11489 Act1
:= First
(Assoc1
);
11492 Set_Generic_Associations
(N1
, New_List
);
11493 Assoc1
:= Generic_Associations
(N1
);
11496 if Present
(Assoc2
) then
11497 Act2
:= First
(Assoc2
);
11502 while Present
(Act1
) and then Present
(Act2
) loop
11507 -- Find the associations added for default subprograms
11509 if Present
(Act2
) then
11510 while Nkind
(Act2
) /= N_Generic_Association
11511 or else No
(Entity
(Selector_Name
(Act2
)))
11512 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
11517 -- Add a similar association if the default is global. The
11518 -- renaming declaration for the actual has been analyzed, and
11519 -- its alias is the program it renames. Link the actual in the
11520 -- original generic tree with the node in the analyzed tree.
11522 while Present
(Act2
) loop
11523 Subp
:= Entity
(Selector_Name
(Act2
));
11524 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
11526 -- Following test is defence against rubbish errors
11528 if No
(Alias
(Subp
)) then
11532 -- Retrieve the resolved actual from the renaming declaration
11533 -- created for the instantiated formal.
11535 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
11536 Set_Entity
(Def
, Actual
);
11537 Set_Etype
(Def
, Etype
(Actual
));
11539 if Is_Global
(Actual
) then
11541 Make_Generic_Association
(Loc
,
11542 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11543 Explicit_Generic_Actual_Parameter
=>
11544 New_Occurrence_Of
(Actual
, Loc
));
11546 Set_Associated_Node
11547 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
11549 Append
(Ndec
, Assoc1
);
11551 -- If there are other defaults, add a dummy association in case
11552 -- there are other defaulted formals with the same name.
11554 elsif Present
(Next
(Act2
)) then
11556 Make_Generic_Association
(Loc
,
11557 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11558 Explicit_Generic_Actual_Parameter
=> Empty
);
11560 Append
(Ndec
, Assoc1
);
11567 if Nkind
(Name
(N1
)) = N_Identifier
11568 and then Is_Child_Unit
(Gen_Id
)
11569 and then Is_Global
(Gen_Id
)
11570 and then Is_Generic_Unit
(Scope
(Gen_Id
))
11571 and then In_Open_Scopes
(Scope
(Gen_Id
))
11573 -- This is an instantiation of a child unit within a sibling,
11574 -- so that the generic parent is in scope. An eventual instance
11575 -- must occur within the scope of an instance of the parent.
11576 -- Make name in instance into an expanded name, to preserve the
11577 -- identifier of the parent, so it can be resolved subsequently.
11579 Rewrite
(Name
(N2
),
11580 Make_Expanded_Name
(Loc
,
11581 Chars
=> Chars
(Gen_Id
),
11582 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11583 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11584 Set_Entity
(Name
(N2
), Gen_Id
);
11586 Rewrite
(Name
(N1
),
11587 Make_Expanded_Name
(Loc
,
11588 Chars
=> Chars
(Gen_Id
),
11589 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11590 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11592 Set_Associated_Node
(Name
(N1
), Name
(N2
));
11593 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
11594 Set_Associated_Node
11595 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
11596 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
11599 end Save_Global_Defaults
;
11601 ----------------------------
11602 -- Save_Global_Descendant --
11603 ----------------------------
11605 procedure Save_Global_Descendant
(D
: Union_Id
) is
11609 if D
in Node_Range
then
11610 if D
= Union_Id
(Empty
) then
11613 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
11614 Save_References
(Node_Id
(D
));
11617 elsif D
in List_Range
then
11618 if D
= Union_Id
(No_List
)
11619 or else Is_Empty_List
(List_Id
(D
))
11624 N1
:= First
(List_Id
(D
));
11625 while Present
(N1
) loop
11626 Save_References
(N1
);
11631 -- Element list or other non-node field, nothing to do
11636 end Save_Global_Descendant
;
11638 ---------------------
11639 -- Save_References --
11640 ---------------------
11642 -- This is the recursive procedure that does the work, once the
11643 -- enclosing generic scope has been established. We have to treat
11644 -- specially a number of node rewritings that are required by semantic
11645 -- processing and which change the kind of nodes in the generic copy:
11646 -- typically constant-folding, replacing an operator node by a string
11647 -- literal, or a selected component by an expanded name. In each of
11648 -- those cases, the transformation is propagated to the generic unit.
11650 procedure Save_References
(N
: Node_Id
) is
11655 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
11656 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11659 elsif Nkind
(N
) = N_Operator_Symbol
11660 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
11662 Change_Operator_Symbol_To_String_Literal
(N
);
11665 elsif Nkind
(N
) in N_Op
then
11666 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11667 if Nkind
(N
) = N_Op_Concat
then
11668 Set_Is_Component_Left_Opnd
(N
,
11669 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
11671 Set_Is_Component_Right_Opnd
(N
,
11672 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
11678 -- Node may be transformed into call to a user-defined operator
11680 N2
:= Get_Associated_Node
(N
);
11682 if Nkind
(N2
) = N_Function_Call
then
11683 E
:= Entity
(Name
(N2
));
11686 and then Is_Global
(E
)
11688 Set_Etype
(N
, Etype
(N2
));
11690 Set_Associated_Node
(N
, Empty
);
11691 Set_Etype
(N
, Empty
);
11694 elsif Nkind_In
(N2
, N_Integer_Literal
,
11698 if Present
(Original_Node
(N2
))
11699 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
11702 -- Operation was constant-folded. Whenever possible,
11703 -- recover semantic information from unfolded node,
11706 Set_Associated_Node
(N
, Original_Node
(N2
));
11708 if Nkind
(N
) = N_Op_Concat
then
11709 Set_Is_Component_Left_Opnd
(N
,
11710 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
11711 Set_Is_Component_Right_Opnd
(N
,
11712 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
11718 -- If original node is already modified, propagate
11719 -- constant-folding to template.
11721 Rewrite
(N
, New_Copy
(N2
));
11722 Set_Analyzed
(N
, False);
11725 elsif Nkind
(N2
) = N_Identifier
11726 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
11728 -- Same if call was folded into a literal, but in this case
11729 -- retain the entity to avoid spurious ambiguities if id is
11730 -- overloaded at the point of instantiation or inlining.
11732 Rewrite
(N
, New_Copy
(N2
));
11733 Set_Analyzed
(N
, False);
11737 -- Complete operands check if node has not been constant-folded
11739 if Nkind
(N
) in N_Op
then
11740 Save_Entity_Descendants
(N
);
11743 elsif Nkind
(N
) = N_Identifier
then
11744 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11746 -- If this is a discriminant reference, always save it. It is
11747 -- used in the instance to find the corresponding discriminant
11748 -- positionally rather than by name.
11750 Set_Original_Discriminant
11751 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
11755 N2
:= Get_Associated_Node
(N
);
11757 if Nkind
(N2
) = N_Function_Call
then
11758 E
:= Entity
(Name
(N2
));
11760 -- Name resolves to a call to parameterless function. If
11761 -- original entity is global, mark node as resolved.
11764 and then Is_Global
(E
)
11766 Set_Etype
(N
, Etype
(N2
));
11768 Set_Associated_Node
(N
, Empty
);
11769 Set_Etype
(N
, Empty
);
11772 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
11773 and then Is_Entity_Name
(Original_Node
(N2
))
11775 -- Name resolves to named number that is constant-folded,
11776 -- We must preserve the original name for ASIS use, and
11777 -- undo the constant-folding, which will be repeated in
11780 Set_Associated_Node
(N
, Original_Node
(N2
));
11783 elsif Nkind
(N2
) = N_String_Literal
then
11785 -- Name resolves to string literal. Perform the same
11786 -- replacement in generic.
11788 Rewrite
(N
, New_Copy
(N2
));
11790 elsif Nkind
(N2
) = N_Explicit_Dereference
then
11792 -- An identifier is rewritten as a dereference if it is
11793 -- the prefix in a selected component, and it denotes an
11794 -- access to a composite type, or a parameterless function
11795 -- call that returns an access type.
11797 -- Check whether corresponding entity in prefix is global
11799 if Is_Entity_Name
(Prefix
(N2
))
11800 and then Present
(Entity
(Prefix
(N2
)))
11801 and then Is_Global
(Entity
(Prefix
(N2
)))
11804 Make_Explicit_Dereference
(Sloc
(N
),
11805 Prefix
=> Make_Identifier
(Sloc
(N
),
11806 Chars
=> Chars
(N
))));
11807 Set_Associated_Node
(Prefix
(N
), Prefix
(N2
));
11809 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
11810 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
11813 Make_Explicit_Dereference
(Sloc
(N
),
11814 Prefix
=> Make_Function_Call
(Sloc
(N
),
11816 Make_Identifier
(Sloc
(N
),
11817 Chars
=> Chars
(N
)))));
11819 Set_Associated_Node
11820 (Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
11823 Set_Associated_Node
(N
, Empty
);
11824 Set_Etype
(N
, Empty
);
11827 -- The subtype mark of a nominally unconstrained object is
11828 -- rewritten as a subtype indication using the bounds of the
11829 -- expression. Recover the original subtype mark.
11831 elsif Nkind
(N2
) = N_Subtype_Indication
11832 and then Is_Entity_Name
(Original_Node
(N2
))
11834 Set_Associated_Node
(N
, Original_Node
(N2
));
11842 elsif Nkind
(N
) in N_Entity
then
11847 Loc
: constant Source_Ptr
:= Sloc
(N
);
11848 Qual
: Node_Id
:= Empty
;
11849 Typ
: Entity_Id
:= Empty
;
11852 use Atree
.Unchecked_Access
;
11853 -- This code section is part of implementing an untyped tree
11854 -- traversal, so it needs direct access to node fields.
11857 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
11858 N2
:= Get_Associated_Node
(N
);
11865 -- In an instance within a generic, use the name of the
11866 -- actual and not the original generic parameter. If the
11867 -- actual is global in the current generic it must be
11868 -- preserved for its instantiation.
11870 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
11872 Present
(Generic_Parent_Type
(Parent
(Typ
)))
11874 Typ
:= Base_Type
(Typ
);
11875 Set_Etype
(N2
, Typ
);
11881 or else not Is_Global
(Typ
)
11883 Set_Associated_Node
(N
, Empty
);
11885 -- If the aggregate is an actual in a call, it has been
11886 -- resolved in the current context, to some local type.
11887 -- The enclosing call may have been disambiguated by the
11888 -- aggregate, and this disambiguation might fail at
11889 -- instantiation time because the type to which the
11890 -- aggregate did resolve is not preserved. In order to
11891 -- preserve some of this information, we wrap the
11892 -- aggregate in a qualified expression, using the id of
11893 -- its type. For further disambiguation we qualify the
11894 -- type name with its scope (if visible) because both
11895 -- id's will have corresponding entities in an instance.
11896 -- This resolves most of the problems with missing type
11897 -- information on aggregates in instances.
11899 if Nkind
(N2
) = Nkind
(N
)
11901 Nkind_In
(Parent
(N2
), N_Procedure_Call_Statement
,
11903 and then Comes_From_Source
(Typ
)
11905 if Is_Immediately_Visible
(Scope
(Typ
)) then
11906 Nam
:= Make_Selected_Component
(Loc
,
11908 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
11910 Make_Identifier
(Loc
, Chars
(Typ
)));
11912 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
11916 Make_Qualified_Expression
(Loc
,
11917 Subtype_Mark
=> Nam
,
11918 Expression
=> Relocate_Node
(N
));
11922 Save_Global_Descendant
(Field1
(N
));
11923 Save_Global_Descendant
(Field2
(N
));
11924 Save_Global_Descendant
(Field3
(N
));
11925 Save_Global_Descendant
(Field5
(N
));
11927 if Present
(Qual
) then
11931 -- All other cases than aggregates
11934 Save_Global_Descendant
(Field1
(N
));
11935 Save_Global_Descendant
(Field2
(N
));
11936 Save_Global_Descendant
(Field3
(N
));
11937 Save_Global_Descendant
(Field4
(N
));
11938 Save_Global_Descendant
(Field5
(N
));
11942 end Save_References
;
11944 -- Start of processing for Save_Global_References
11947 Gen_Scope
:= Current_Scope
;
11949 -- If the generic unit is a child unit, references to entities in the
11950 -- parent are treated as local, because they will be resolved anew in
11951 -- the context of the instance of the parent.
11953 while Is_Child_Unit
(Gen_Scope
)
11954 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
11956 Gen_Scope
:= Scope
(Gen_Scope
);
11959 Save_References
(N
);
11960 end Save_Global_References
;
11962 --------------------------------------
11963 -- Set_Copied_Sloc_For_Inlined_Body --
11964 --------------------------------------
11966 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
11968 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
11969 end Set_Copied_Sloc_For_Inlined_Body
;
11971 ---------------------
11972 -- Set_Instance_Of --
11973 ---------------------
11975 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
11977 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
11978 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
11979 Generic_Renamings
.Increment_Last
;
11980 end Set_Instance_Of
;
11982 --------------------
11983 -- Set_Next_Assoc --
11984 --------------------
11986 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
11988 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
11989 end Set_Next_Assoc
;
11991 -------------------
11992 -- Start_Generic --
11993 -------------------
11995 procedure Start_Generic
is
11997 -- ??? More things could be factored out in this routine.
11998 -- Should probably be done at a later stage.
12000 Generic_Flags
.Append
(Inside_A_Generic
);
12001 Inside_A_Generic
:= True;
12003 Expander_Mode_Save_And_Set
(False);
12006 ----------------------
12007 -- Set_Instance_Env --
12008 ----------------------
12010 procedure Set_Instance_Env
12011 (Gen_Unit
: Entity_Id
;
12012 Act_Unit
: Entity_Id
)
12015 -- Regardless of the current mode, predefined units are analyzed in
12016 -- the most current Ada mode, and earlier version Ada checks do not
12017 -- apply to predefined units. Nothing needs to be done for non-internal
12018 -- units. These are always analyzed in the current mode.
12020 if Is_Internal_File_Name
12021 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
12022 Renamings_Included
=> True)
12024 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
12027 Current_Instantiated_Parent
:= (Gen_Unit
, Act_Unit
, Assoc_Null
);
12028 end Set_Instance_Env
;
12034 procedure Switch_View
(T
: Entity_Id
) is
12035 BT
: constant Entity_Id
:= Base_Type
(T
);
12036 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
12037 Priv_Sub
: Entity_Id
;
12040 -- T may be private but its base type may have been exchanged through
12041 -- some other occurrence, in which case there is nothing to switch
12042 -- besides T itself. Note that a private dependent subtype of a private
12043 -- type might not have been switched even if the base type has been,
12044 -- because of the last branch of Check_Private_View (see comment there).
12046 if not Is_Private_Type
(BT
) then
12047 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
12048 Exchange_Declarations
(T
);
12052 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
12054 if Present
(Full_View
(BT
)) then
12055 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
12056 Exchange_Declarations
(BT
);
12059 while Present
(Priv_Elmt
) loop
12060 Priv_Sub
:= (Node
(Priv_Elmt
));
12062 -- We avoid flipping the subtype if the Etype of its full view is
12063 -- private because this would result in a malformed subtype. This
12064 -- occurs when the Etype of the subtype full view is the full view of
12065 -- the base type (and since the base types were just switched, the
12066 -- subtype is pointing to the wrong view). This is currently the case
12067 -- for tagged record types, access types (maybe more?) and needs to
12068 -- be resolved. ???
12070 if Present
(Full_View
(Priv_Sub
))
12071 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
12073 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
12074 Exchange_Declarations
(Priv_Sub
);
12077 Next_Elmt
(Priv_Elmt
);
12081 -----------------------------
12082 -- Valid_Default_Attribute --
12083 -----------------------------
12085 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
12086 Attr_Id
: constant Attribute_Id
:=
12087 Get_Attribute_Id
(Attribute_Name
(Def
));
12088 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
12089 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
12102 F
:= First_Formal
(Nam
);
12103 while Present
(F
) loop
12104 Num_F
:= Num_F
+ 1;
12109 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12110 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12111 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12112 Attribute_Unbiased_Rounding
=>
12115 and then Is_Floating_Point_Type
(T
);
12117 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12118 Attribute_Value | Attribute_Wide_Image |
12119 Attribute_Wide_Value
=>
12120 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
12122 when Attribute_Max | Attribute_Min
=>
12123 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
12125 when Attribute_Input
=>
12126 OK
:= (Is_Fun
and then Num_F
= 1);
12128 when Attribute_Output | Attribute_Read | Attribute_Write
=>
12129 OK
:= (not Is_Fun
and then Num_F
= 2);
12136 Error_Msg_N
("attribute reference has wrong profile for subprogram",
12139 end Valid_Default_Attribute
;