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 a formal
900 -- package. As usual an other 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 -- Verify that there is no redundant null exclusion.
1815 if Null_Exclusion_Present
(N
) then
1816 if not Is_Access_Type
(T
) then
1818 ("null exclusion can only apply to an access type", N
);
1820 elsif Can_Never_Be_Null
(T
) then
1822 ("`NOT NULL` not allowed (& already excludes null)",
1827 -- Ada 2005 (AI-423): Formal object with an access definition
1830 Check_Access_Definition
(N
);
1831 T
:= Access_Definition
1833 N
=> Access_Definition
(N
));
1836 if Ekind
(T
) = E_Incomplete_Type
then
1838 Error_Node
: Node_Id
;
1841 if Present
(Subtype_Mark
(N
)) then
1842 Error_Node
:= Subtype_Mark
(N
);
1844 Check_Access_Definition
(N
);
1845 Error_Node
:= Access_Definition
(N
);
1848 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
1852 if K
= E_Generic_In_Parameter
then
1854 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1856 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1858 ("generic formal of mode IN must not be of limited type", N
);
1859 Explain_Limited_Type
(T
, N
);
1862 if Is_Abstract_Type
(T
) then
1864 ("generic formal of mode IN must not be of abstract type", N
);
1868 Preanalyze_Spec_Expression
(E
, T
);
1870 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(E
) then
1872 ("initialization not allowed for limited types", E
);
1873 Explain_Limited_Type
(T
, E
);
1880 -- Case of generic IN OUT parameter
1883 -- If the formal has an unconstrained type, construct its actual
1884 -- subtype, as is done for subprogram formals. In this fashion, all
1885 -- its uses can refer to specific bounds.
1890 if (Is_Array_Type
(T
)
1891 and then not Is_Constrained
(T
))
1893 (Ekind
(T
) = E_Record_Type
1894 and then Has_Discriminants
(T
))
1897 Non_Freezing_Ref
: constant Node_Id
:=
1898 New_Reference_To
(Id
, Sloc
(Id
));
1902 -- Make sure the actual subtype doesn't generate bogus freezing
1904 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1905 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1906 Insert_Before_And_Analyze
(N
, Decl
);
1907 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1910 Set_Actual_Subtype
(Id
, T
);
1915 ("initialization not allowed for `IN OUT` formals", N
);
1919 end Analyze_Formal_Object_Declaration
;
1921 ----------------------------------------------
1922 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1923 ----------------------------------------------
1925 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1929 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1930 Base
: constant Entity_Id
:=
1932 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1934 -- The semantic attributes are set for completeness only, their values
1935 -- will never be used, since all properties of the type are non-static.
1938 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1939 Set_Etype
(T
, Base
);
1940 Set_Size_Info
(T
, Standard_Integer
);
1941 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1942 Set_Small_Value
(T
, Ureal_1
);
1943 Set_Delta_Value
(T
, Ureal_1
);
1944 Set_Scalar_Range
(T
,
1946 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1947 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1948 Set_Is_Constrained
(T
);
1950 Set_Is_Generic_Type
(Base
);
1951 Set_Etype
(Base
, Base
);
1952 Set_Size_Info
(Base
, Standard_Integer
);
1953 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1954 Set_Small_Value
(Base
, Ureal_1
);
1955 Set_Delta_Value
(Base
, Ureal_1
);
1956 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1957 Set_Parent
(Base
, Parent
(Def
));
1959 Check_Restriction
(No_Fixed_Point
, Def
);
1960 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1962 ----------------------------
1963 -- Analyze_Formal_Package --
1964 ----------------------------
1966 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1967 Loc
: constant Source_Ptr
:= Sloc
(N
);
1968 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1970 Gen_Id
: constant Node_Id
:= Name
(N
);
1972 Gen_Unit
: Entity_Id
;
1974 Parent_Installed
: Boolean := False;
1976 Parent_Instance
: Entity_Id
;
1977 Renaming_In_Par
: Entity_Id
;
1978 No_Associations
: Boolean := False;
1980 function Build_Local_Package
return Node_Id
;
1981 -- The formal package is rewritten so that its parameters are replaced
1982 -- with corresponding declarations. For parameters with bona fide
1983 -- associations these declarations are created by Analyze_Associations
1984 -- as for a regular instantiation. For boxed parameters, we preserve
1985 -- the formal declarations and analyze them, in order to introduce
1986 -- entities of the right kind in the environment of the formal.
1988 -------------------------
1989 -- Build_Local_Package --
1990 -------------------------
1992 function Build_Local_Package
return Node_Id
is
1994 Pack_Decl
: Node_Id
;
1997 -- Within the formal, the name of the generic package is a renaming
1998 -- of the formal (as for a regular instantiation).
2001 Make_Package_Declaration
(Loc
,
2004 (Specification
(Original_Node
(Gen_Decl
)),
2005 Empty
, Instantiating
=> True));
2007 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
2008 Defining_Unit_Name
=>
2009 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2010 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2012 if Nkind
(Gen_Id
) = N_Identifier
2013 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2016 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2019 -- If the formal is declared with a box, or with an others choice,
2020 -- create corresponding declarations for all entities in the formal
2021 -- part, so that names with the proper types are available in the
2022 -- specification of the formal package.
2023 -- On the other hand, if there are no associations, then all the
2024 -- formals must have defaults, and this will be checked by the
2025 -- call to Analyze_Associations.
2028 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2031 Formal_Decl
: Node_Id
;
2034 -- TBA : for a formal package, need to recurse ???
2039 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2040 while Present
(Formal_Decl
) loop
2042 (Decls
, Copy_Generic_Node
(Formal_Decl
, Empty
, True));
2047 -- If generic associations are present, use Analyze_Associations to
2048 -- create the proper renaming declarations.
2052 Act_Tree
: constant Node_Id
:=
2054 (Original_Node
(Gen_Decl
), Empty
,
2055 Instantiating
=> True);
2058 Generic_Renamings
.Set_Last
(0);
2059 Generic_Renamings_HTable
.Reset
;
2060 Instantiation_Node
:= N
;
2063 Analyze_Associations
2065 Generic_Formal_Declarations
(Act_Tree
),
2066 Generic_Formal_Declarations
(Gen_Decl
));
2070 Append
(Renaming
, To
=> Decls
);
2072 -- Add generated declarations ahead of local declarations in
2075 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2076 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2079 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2084 end Build_Local_Package
;
2086 -- Start of processing for Analyze_Formal_Package
2089 Text_IO_Kludge
(Gen_Id
);
2092 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2093 Gen_Unit
:= Entity
(Gen_Id
);
2095 -- Check for a formal package that is a package renaming
2097 if Present
(Renamed_Object
(Gen_Unit
)) then
2098 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2101 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2102 Error_Msg_N
("expect generic package name", Gen_Id
);
2106 elsif Gen_Unit
= Current_Scope
then
2108 ("generic package cannot be used as a formal package of itself",
2113 elsif In_Open_Scopes
(Gen_Unit
) then
2114 if Is_Compilation_Unit
(Gen_Unit
)
2115 and then Is_Child_Unit
(Current_Scope
)
2117 -- Special-case the error when the formal is a parent, and
2118 -- continue analysis to minimize cascaded errors.
2121 ("generic parent cannot be used as formal package "
2122 & "of a child unit",
2127 ("generic package cannot be used as a formal package "
2136 or else No
(Generic_Associations
(N
))
2137 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2139 No_Associations
:= True;
2142 -- If there are no generic associations, the generic parameters appear
2143 -- as local entities and are instantiated like them. We copy the generic
2144 -- package declaration as if it were an instantiation, and analyze it
2145 -- like a regular package, except that we treat the formals as
2146 -- additional visible components.
2148 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2150 if In_Extended_Main_Source_Unit
(N
) then
2151 Set_Is_Instantiated
(Gen_Unit
);
2152 Generate_Reference
(Gen_Unit
, N
);
2155 Formal
:= New_Copy
(Pack_Id
);
2156 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2159 -- Make local generic without formals. The formals will be replaced
2160 -- with internal declarations.
2162 New_N
:= Build_Local_Package
;
2164 -- If there are errors in the parameter list, Analyze_Associations
2165 -- raises Instantiation_Error. Patch the declaration to prevent
2166 -- further exception propagation.
2169 when Instantiation_Error
=>
2171 Enter_Name
(Formal
);
2172 Set_Ekind
(Formal
, E_Variable
);
2173 Set_Etype
(Formal
, Any_Type
);
2175 if Parent_Installed
then
2183 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2184 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2185 Set_Instance_Env
(Gen_Unit
, Formal
);
2186 Set_Is_Generic_Instance
(Formal
);
2188 Enter_Name
(Formal
);
2189 Set_Ekind
(Formal
, E_Package
);
2190 Set_Etype
(Formal
, Standard_Void_Type
);
2191 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2192 Push_Scope
(Formal
);
2194 if Is_Child_Unit
(Gen_Unit
)
2195 and then Parent_Installed
2197 -- Similarly, we have to make the name of the formal visible in the
2198 -- parent instance, to resolve properly fully qualified names that
2199 -- may appear in the generic unit. The parent instance has been
2200 -- placed on the scope stack ahead of the current scope.
2202 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2205 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2206 Set_Ekind
(Renaming_In_Par
, E_Package
);
2207 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2208 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2209 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2210 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2211 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2214 Analyze
(Specification
(N
));
2216 -- The formals for which associations are provided are not visible
2217 -- outside of the formal package. The others are still declared by a
2218 -- formal parameter declaration.
2220 if not No_Associations
then
2225 E
:= First_Entity
(Formal
);
2226 while Present
(E
) loop
2227 exit when Ekind
(E
) = E_Package
2228 and then Renamed_Entity
(E
) = Formal
;
2230 if not Is_Generic_Formal
(E
) then
2239 End_Package_Scope
(Formal
);
2241 if Parent_Installed
then
2247 -- Inside the generic unit, the formal package is a regular package, but
2248 -- no body is needed for it. Note that after instantiation, the defining
2249 -- unit name we need is in the new tree and not in the original (see
2250 -- Package_Instantiation). A generic formal package is an instance, and
2251 -- can be used as an actual for an inner instance.
2253 Set_Has_Completion
(Formal
, True);
2255 -- Add semantic information to the original defining identifier.
2258 Set_Ekind
(Pack_Id
, E_Package
);
2259 Set_Etype
(Pack_Id
, Standard_Void_Type
);
2260 Set_Scope
(Pack_Id
, Scope
(Formal
));
2261 Set_Has_Completion
(Pack_Id
, True);
2262 end Analyze_Formal_Package
;
2264 ---------------------------------
2265 -- Analyze_Formal_Private_Type --
2266 ---------------------------------
2268 procedure Analyze_Formal_Private_Type
2274 New_Private_Type
(N
, T
, Def
);
2276 -- Set the size to an arbitrary but legal value
2278 Set_Size_Info
(T
, Standard_Integer
);
2279 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2280 end Analyze_Formal_Private_Type
;
2282 ----------------------------------------
2283 -- Analyze_Formal_Signed_Integer_Type --
2284 ----------------------------------------
2286 procedure Analyze_Formal_Signed_Integer_Type
2290 Base
: constant Entity_Id
:=
2292 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
2297 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
2298 Set_Etype
(T
, Base
);
2299 Set_Size_Info
(T
, Standard_Integer
);
2300 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2301 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
2302 Set_Is_Constrained
(T
);
2304 Set_Is_Generic_Type
(Base
);
2305 Set_Size_Info
(Base
, Standard_Integer
);
2306 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2307 Set_Etype
(Base
, Base
);
2308 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
2309 Set_Parent
(Base
, Parent
(Def
));
2310 end Analyze_Formal_Signed_Integer_Type
;
2312 -------------------------------
2313 -- Analyze_Formal_Subprogram --
2314 -------------------------------
2316 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
2317 Spec
: constant Node_Id
:= Specification
(N
);
2318 Def
: constant Node_Id
:= Default_Name
(N
);
2319 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2327 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
2328 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
2332 Analyze_Subprogram_Declaration
(N
);
2333 Set_Is_Formal_Subprogram
(Nam
);
2334 Set_Has_Completion
(Nam
);
2336 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
2337 Set_Is_Abstract_Subprogram
(Nam
);
2338 Set_Is_Dispatching_Operation
(Nam
);
2341 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
2343 if No
(Ctrl_Type
) then
2345 ("abstract formal subprogram must have a controlling type",
2348 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
2353 -- Default name is resolved at the point of instantiation
2355 if Box_Present
(N
) then
2358 -- Else default is bound at the point of generic declaration
2360 elsif Present
(Def
) then
2361 if Nkind
(Def
) = N_Operator_Symbol
then
2362 Find_Direct_Name
(Def
);
2364 elsif Nkind
(Def
) /= N_Attribute_Reference
then
2368 -- For an attribute reference, analyze the prefix and verify
2369 -- that it has the proper profile for the subprogram.
2371 Analyze
(Prefix
(Def
));
2372 Valid_Default_Attribute
(Nam
, Def
);
2376 -- Default name may be overloaded, in which case the interpretation
2377 -- with the correct profile must be selected, as for a renaming.
2378 -- If the definition is an indexed component, it must denote a
2379 -- member of an entry family. If it is a selected component, it
2380 -- can be a protected operation.
2382 if Etype
(Def
) = Any_Type
then
2385 elsif Nkind
(Def
) = N_Selected_Component
then
2386 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
2387 Error_Msg_N
("expect valid subprogram name as default", Def
);
2390 elsif Nkind
(Def
) = N_Indexed_Component
then
2391 if Is_Entity_Name
(Prefix
(Def
)) then
2392 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
2393 Error_Msg_N
("expect valid subprogram name as default", Def
);
2396 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
2397 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
))))
2400 Error_Msg_N
("expect valid subprogram name as default", Def
);
2404 Error_Msg_N
("expect valid subprogram name as default", Def
);
2408 elsif Nkind
(Def
) = N_Character_Literal
then
2410 -- Needs some type checks: subprogram should be parameterless???
2412 Resolve
(Def
, (Etype
(Nam
)));
2414 elsif not Is_Entity_Name
(Def
)
2415 or else not Is_Overloadable
(Entity
(Def
))
2417 Error_Msg_N
("expect valid subprogram name as default", Def
);
2420 elsif not Is_Overloaded
(Def
) then
2421 Subp
:= Entity
(Def
);
2424 Error_Msg_N
("premature usage of formal subprogram", Def
);
2426 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
2427 Error_Msg_N
("no visible entity matches specification", Def
);
2430 -- More than one interpretation, so disambiguate as for a renaming
2435 I1
: Interp_Index
:= 0;
2441 Get_First_Interp
(Def
, I
, It
);
2442 while Present
(It
.Nam
) loop
2443 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
2444 if Subp
/= Any_Id
then
2445 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
2447 if It1
= No_Interp
then
2448 Error_Msg_N
("ambiguous default subprogram", Def
);
2461 Get_Next_Interp
(I
, It
);
2465 if Subp
/= Any_Id
then
2466 Set_Entity
(Def
, Subp
);
2469 Error_Msg_N
("premature usage of formal subprogram", Def
);
2471 elsif Ekind
(Subp
) /= E_Operator
then
2472 Check_Mode_Conformant
(Subp
, Nam
);
2476 Error_Msg_N
("no visible subprogram matches specification", N
);
2480 end Analyze_Formal_Subprogram
;
2482 -------------------------------------
2483 -- Analyze_Formal_Type_Declaration --
2484 -------------------------------------
2486 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
2487 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
2491 T
:= Defining_Identifier
(N
);
2493 if Present
(Discriminant_Specifications
(N
))
2494 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2497 ("discriminants not allowed for this formal type", T
);
2500 -- Enter the new name, and branch to specific routine
2503 when N_Formal_Private_Type_Definition
=>
2504 Analyze_Formal_Private_Type
(N
, T
, Def
);
2506 when N_Formal_Derived_Type_Definition
=>
2507 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2509 when N_Formal_Discrete_Type_Definition
=>
2510 Analyze_Formal_Discrete_Type
(T
, Def
);
2512 when N_Formal_Signed_Integer_Type_Definition
=>
2513 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2515 when N_Formal_Modular_Type_Definition
=>
2516 Analyze_Formal_Modular_Type
(T
, Def
);
2518 when N_Formal_Floating_Point_Definition
=>
2519 Analyze_Formal_Floating_Type
(T
, Def
);
2521 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2522 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2524 when N_Formal_Decimal_Fixed_Point_Definition
=>
2525 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2527 when N_Array_Type_Definition
=>
2528 Analyze_Formal_Array_Type
(T
, Def
);
2530 when N_Access_To_Object_Definition |
2531 N_Access_Function_Definition |
2532 N_Access_Procedure_Definition
=>
2533 Analyze_Generic_Access_Type
(T
, Def
);
2535 -- Ada 2005: a interface declaration is encoded as an abstract
2536 -- record declaration or a abstract type derivation.
2538 when N_Record_Definition
=>
2539 Analyze_Formal_Interface_Type
(N
, T
, Def
);
2541 when N_Derived_Type_Definition
=>
2542 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
2548 raise Program_Error
;
2552 Set_Is_Generic_Type
(T
);
2553 end Analyze_Formal_Type_Declaration
;
2555 ------------------------------------
2556 -- Analyze_Function_Instantiation --
2557 ------------------------------------
2559 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2561 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2562 end Analyze_Function_Instantiation
;
2564 ---------------------------------
2565 -- Analyze_Generic_Access_Type --
2566 ---------------------------------
2568 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2572 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2573 Access_Type_Declaration
(T
, Def
);
2575 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2576 and then No
(Full_View
(Designated_Type
(T
)))
2577 and then not Is_Generic_Type
(Designated_Type
(T
))
2579 Error_Msg_N
("premature usage of incomplete type", Def
);
2581 elsif Is_Internal
(Designated_Type
(T
)) then
2583 ("only a subtype mark is allowed in a formal", Def
);
2587 Access_Subprogram_Declaration
(T
, Def
);
2589 end Analyze_Generic_Access_Type
;
2591 ---------------------------------
2592 -- Analyze_Generic_Formal_Part --
2593 ---------------------------------
2595 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2596 Gen_Parm_Decl
: Node_Id
;
2599 -- The generic formals are processed in the scope of the generic unit,
2600 -- where they are immediately visible. The scope is installed by the
2603 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2605 while Present
(Gen_Parm_Decl
) loop
2606 Analyze
(Gen_Parm_Decl
);
2607 Next
(Gen_Parm_Decl
);
2610 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2611 end Analyze_Generic_Formal_Part
;
2613 ------------------------------------------
2614 -- Analyze_Generic_Package_Declaration --
2615 ------------------------------------------
2617 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2618 Loc
: constant Source_Ptr
:= Sloc
(N
);
2621 Save_Parent
: Node_Id
;
2623 Decls
: constant List_Id
:=
2624 Visible_Declarations
(Specification
(N
));
2628 -- We introduce a renaming of the enclosing package, to have a usable
2629 -- entity as the prefix of an expanded name for a local entity of the
2630 -- form Par.P.Q, where P is the generic package. This is because a local
2631 -- entity named P may hide it, so that the usual visibility rules in
2632 -- the instance will not resolve properly.
2635 Make_Package_Renaming_Declaration
(Loc
,
2636 Defining_Unit_Name
=>
2637 Make_Defining_Identifier
(Loc
,
2638 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2639 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2641 if Present
(Decls
) then
2642 Decl
:= First
(Decls
);
2643 while Present
(Decl
)
2644 and then Nkind
(Decl
) = N_Pragma
2649 if Present
(Decl
) then
2650 Insert_Before
(Decl
, Renaming
);
2652 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2656 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2659 -- Create copy of generic unit, and save for instantiation. If the unit
2660 -- is a child unit, do not copy the specifications for the parent, which
2661 -- are not part of the generic tree.
2663 Save_Parent
:= Parent_Spec
(N
);
2664 Set_Parent_Spec
(N
, Empty
);
2666 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2667 Set_Parent_Spec
(New_N
, Save_Parent
);
2669 Id
:= Defining_Entity
(N
);
2670 Generate_Definition
(Id
);
2672 -- Expansion is not applied to generic units
2677 Set_Ekind
(Id
, E_Generic_Package
);
2678 Set_Etype
(Id
, Standard_Void_Type
);
2680 Enter_Generic_Scope
(Id
);
2681 Set_Inner_Instances
(Id
, New_Elmt_List
);
2683 Set_Categorization_From_Pragmas
(N
);
2684 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2686 -- Link the declaration of the generic homonym in the generic copy to
2687 -- the package it renames, so that it is always resolved properly.
2689 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2690 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2692 -- For a library unit, we have reconstructed the entity for the unit,
2693 -- and must reset it in the library tables.
2695 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2696 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2699 Analyze_Generic_Formal_Part
(N
);
2701 -- After processing the generic formals, analysis proceeds as for a
2702 -- non-generic package.
2704 Analyze
(Specification
(N
));
2706 Validate_Categorization_Dependency
(N
, Id
);
2710 End_Package_Scope
(Id
);
2711 Exit_Generic_Scope
(Id
);
2713 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2714 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2715 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2716 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2719 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2720 Validate_RT_RAT_Component
(N
);
2722 -- If this is a spec without a body, check that generic parameters
2725 if not Body_Required
(Parent
(N
)) then
2726 Check_References
(Id
);
2729 end Analyze_Generic_Package_Declaration
;
2731 --------------------------------------------
2732 -- Analyze_Generic_Subprogram_Declaration --
2733 --------------------------------------------
2735 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2740 Result_Type
: Entity_Id
;
2741 Save_Parent
: Node_Id
;
2744 -- Create copy of generic unit, and save for instantiation. If the unit
2745 -- is a child unit, do not copy the specifications for the parent, which
2746 -- are not part of the generic tree.
2748 Save_Parent
:= Parent_Spec
(N
);
2749 Set_Parent_Spec
(N
, Empty
);
2751 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2752 Set_Parent_Spec
(New_N
, Save_Parent
);
2755 Spec
:= Specification
(N
);
2756 Id
:= Defining_Entity
(Spec
);
2757 Generate_Definition
(Id
);
2759 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2761 ("operator symbol not allowed for generic subprogram", Id
);
2768 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2770 Enter_Generic_Scope
(Id
);
2771 Set_Inner_Instances
(Id
, New_Elmt_List
);
2772 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2774 Analyze_Generic_Formal_Part
(N
);
2776 Formals
:= Parameter_Specifications
(Spec
);
2778 if Present
(Formals
) then
2779 Process_Formals
(Formals
, Spec
);
2782 if Nkind
(Spec
) = N_Function_Specification
then
2783 Set_Ekind
(Id
, E_Generic_Function
);
2785 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
2786 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
2787 Set_Etype
(Id
, Result_Type
);
2789 Find_Type
(Result_Definition
(Spec
));
2790 Set_Etype
(Id
, Entity
(Result_Definition
(Spec
)));
2794 Set_Ekind
(Id
, E_Generic_Procedure
);
2795 Set_Etype
(Id
, Standard_Void_Type
);
2798 -- For a library unit, we have reconstructed the entity for the unit,
2799 -- and must reset it in the library tables. We also make sure that
2800 -- Body_Required is set properly in the original compilation unit node.
2802 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2803 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2804 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2807 Set_Categorization_From_Pragmas
(N
);
2808 Validate_Categorization_Dependency
(N
, Id
);
2810 Save_Global_References
(Original_Node
(N
));
2814 Exit_Generic_Scope
(Id
);
2815 Generate_Reference_To_Formals
(Id
);
2816 end Analyze_Generic_Subprogram_Declaration
;
2818 -----------------------------------
2819 -- Analyze_Package_Instantiation --
2820 -----------------------------------
2822 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2823 Loc
: constant Source_Ptr
:= Sloc
(N
);
2824 Gen_Id
: constant Node_Id
:= Name
(N
);
2827 Act_Decl_Name
: Node_Id
;
2828 Act_Decl_Id
: Entity_Id
;
2833 Gen_Unit
: Entity_Id
;
2835 Is_Actual_Pack
: constant Boolean :=
2836 Is_Internal
(Defining_Entity
(N
));
2838 Env_Installed
: Boolean := False;
2839 Parent_Installed
: Boolean := False;
2840 Renaming_List
: List_Id
;
2841 Unit_Renaming
: Node_Id
;
2842 Needs_Body
: Boolean;
2843 Inline_Now
: Boolean := False;
2845 procedure Delay_Descriptors
(E
: Entity_Id
);
2846 -- Delay generation of subprogram descriptors for given entity
2848 function Might_Inline_Subp
return Boolean;
2849 -- If inlining is active and the generic contains inlined subprograms,
2850 -- we instantiate the body. This may cause superfluous instantiations,
2851 -- but it is simpler than detecting the need for the body at the point
2852 -- of inlining, when the context of the instance is not available.
2854 -----------------------
2855 -- Delay_Descriptors --
2856 -----------------------
2858 procedure Delay_Descriptors
(E
: Entity_Id
) is
2860 if not Delay_Subprogram_Descriptors
(E
) then
2861 Set_Delay_Subprogram_Descriptors
(E
);
2862 Pending_Descriptor
.Append
(E
);
2864 end Delay_Descriptors
;
2866 -----------------------
2867 -- Might_Inline_Subp --
2868 -----------------------
2870 function Might_Inline_Subp
return Boolean is
2874 if not Inline_Processing_Required
then
2878 E
:= First_Entity
(Gen_Unit
);
2879 while Present
(E
) loop
2880 if Is_Subprogram
(E
)
2881 and then Is_Inlined
(E
)
2891 end Might_Inline_Subp
;
2893 -- Start of processing for Analyze_Package_Instantiation
2896 -- Very first thing: apply the special kludge for Text_IO processing
2897 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2899 Text_IO_Kludge
(Name
(N
));
2901 -- Make node global for error reporting
2903 Instantiation_Node
:= N
;
2905 -- Case of instantiation of a generic package
2907 if Nkind
(N
) = N_Package_Instantiation
then
2908 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2909 Set_Comes_From_Source
(Act_Decl_Id
, True);
2911 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2913 Make_Defining_Program_Unit_Name
(Loc
,
2914 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2915 Defining_Identifier
=> Act_Decl_Id
);
2917 Act_Decl_Name
:= Act_Decl_Id
;
2920 -- Case of instantiation of a formal package
2923 Act_Decl_Id
:= Defining_Identifier
(N
);
2924 Act_Decl_Name
:= Act_Decl_Id
;
2927 Generate_Definition
(Act_Decl_Id
);
2928 Preanalyze_Actuals
(N
);
2931 Env_Installed
:= True;
2932 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2933 Gen_Unit
:= Entity
(Gen_Id
);
2935 -- Verify that it is the name of a generic package
2937 if Etype
(Gen_Unit
) = Any_Type
then
2941 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2943 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2945 if From_With_Type
(Gen_Unit
) then
2947 ("cannot instantiate a limited withed package", Gen_Id
);
2950 ("expect name of generic package in instantiation", Gen_Id
);
2957 if In_Extended_Main_Source_Unit
(N
) then
2958 Set_Is_Instantiated
(Gen_Unit
);
2959 Generate_Reference
(Gen_Unit
, N
);
2961 if Present
(Renamed_Object
(Gen_Unit
)) then
2962 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2963 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2967 if Nkind
(Gen_Id
) = N_Identifier
2968 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2971 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2973 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2974 and then Is_Child_Unit
(Gen_Unit
)
2975 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2976 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2979 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2982 Set_Entity
(Gen_Id
, Gen_Unit
);
2984 -- If generic is a renaming, get original generic unit
2986 if Present
(Renamed_Object
(Gen_Unit
))
2987 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2989 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2992 -- Verify that there are no circular instantiations
2994 if In_Open_Scopes
(Gen_Unit
) then
2995 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2999 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3000 Error_Msg_Node_2
:= Current_Scope
;
3002 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3003 Circularity_Detected
:= True;
3008 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3010 -- Initialize renamings map, for error checking, and the list that
3011 -- holds private entities whose views have changed between generic
3012 -- definition and instantiation. If this is the instance created to
3013 -- validate an actual package, the instantiation environment is that
3014 -- of the enclosing instance.
3016 Generic_Renamings
.Set_Last
(0);
3017 Generic_Renamings_HTable
.Reset
;
3019 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3021 -- Copy original generic tree, to produce text for instantiation
3025 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3027 Act_Spec
:= Specification
(Act_Tree
);
3029 -- If this is the instance created to validate an actual package,
3030 -- only the formals matter, do not examine the package spec itself.
3032 if Is_Actual_Pack
then
3033 Set_Visible_Declarations
(Act_Spec
, New_List
);
3034 Set_Private_Declarations
(Act_Spec
, New_List
);
3038 Analyze_Associations
3040 Generic_Formal_Declarations
(Act_Tree
),
3041 Generic_Formal_Declarations
(Gen_Decl
));
3043 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3044 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3045 Set_Is_Generic_Instance
(Act_Decl_Id
);
3047 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3049 -- References to the generic in its own declaration or its body are
3050 -- references to the instance. Add a renaming declaration for the
3051 -- generic unit itself. This declaration, as well as the renaming
3052 -- declarations for the generic formals, must remain private to the
3053 -- unit: the formals, because this is the language semantics, and
3054 -- the unit because its use is an artifact of the implementation.
3057 Make_Package_Renaming_Declaration
(Loc
,
3058 Defining_Unit_Name
=>
3059 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3060 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
3062 Append
(Unit_Renaming
, Renaming_List
);
3064 -- The renaming declarations are the first local declarations of
3067 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3069 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3071 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3075 Make_Package_Declaration
(Loc
,
3076 Specification
=> Act_Spec
);
3078 -- Save the instantiation node, for subsequent instantiation of the
3079 -- body, if there is one and we are generating code for the current
3080 -- unit. Mark the unit as having a body, to avoid a premature error
3083 -- We instantiate the body if we are generating code, if we are
3084 -- generating cross-reference information, or if we are building
3085 -- trees for ASIS use.
3088 Enclosing_Body_Present
: Boolean := False;
3089 -- If the generic unit is not a compilation unit, then a body may
3090 -- be present in its parent even if none is required. We create a
3091 -- tentative pending instantiation for the body, which will be
3092 -- discarded if none is actually present.
3097 if Scope
(Gen_Unit
) /= Standard_Standard
3098 and then not Is_Child_Unit
(Gen_Unit
)
3100 Scop
:= Scope
(Gen_Unit
);
3102 while Present
(Scop
)
3103 and then Scop
/= Standard_Standard
3105 if Unit_Requires_Body
(Scop
) then
3106 Enclosing_Body_Present
:= True;
3109 elsif In_Open_Scopes
(Scop
)
3110 and then In_Package_Body
(Scop
)
3112 Enclosing_Body_Present
:= True;
3116 exit when Is_Compilation_Unit
(Scop
);
3117 Scop
:= Scope
(Scop
);
3121 -- If front-end inlining is enabled, and this is a unit for which
3122 -- code will be generated, we instantiate the body at once.
3124 -- This is done if the instance is not the main unit, and if the
3125 -- generic is not a child unit of another generic, to avoid scope
3126 -- problems and the reinstallation of parent instances.
3129 and then (not Is_Child_Unit
(Gen_Unit
)
3130 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
3131 and then Might_Inline_Subp
3132 and then not Is_Actual_Pack
3134 if Front_End_Inlining
3135 and then (Is_In_Main_Unit
(N
)
3136 or else In_Main_Context
(Current_Scope
))
3137 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3141 -- In configurable_run_time mode we force the inlining of
3142 -- predefined subprograms marked Inline_Always, to minimize
3143 -- the use of the run-time library.
3145 elsif Is_Predefined_File_Name
3146 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
3147 and then Configurable_Run_Time_Mode
3148 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3153 -- If the current scope is itself an instance within a child
3154 -- unit, there will be duplications in the scope stack, and the
3155 -- unstacking mechanism in Inline_Instance_Body will fail.
3156 -- This loses some rare cases of optimization, and might be
3157 -- improved some day, if we can find a proper abstraction for
3158 -- "the complete compilation context" that can be saved and
3161 if Is_Generic_Instance
(Current_Scope
) then
3163 Curr_Unit
: constant Entity_Id
:=
3164 Cunit_Entity
(Current_Sem_Unit
);
3166 if Curr_Unit
/= Current_Scope
3167 and then Is_Child_Unit
(Curr_Unit
)
3169 Inline_Now
:= False;
3176 (Unit_Requires_Body
(Gen_Unit
)
3177 or else Enclosing_Body_Present
3178 or else Present
(Corresponding_Body
(Gen_Decl
)))
3179 and then (Is_In_Main_Unit
(N
)
3180 or else Might_Inline_Subp
)
3181 and then not Is_Actual_Pack
3182 and then not Inline_Now
3183 and then (Operating_Mode
= Generate_Code
3184 or else (Operating_Mode
= Check_Semantics
3185 and then ASIS_Mode
));
3187 -- If front_end_inlining is enabled, do not instantiate body if
3188 -- within a generic context.
3190 if (Front_End_Inlining
3191 and then not Expander_Active
)
3192 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
3194 Needs_Body
:= False;
3197 -- If the current context is generic, and the package being
3198 -- instantiated is declared within a formal package, there is no
3199 -- body to instantiate until the enclosing generic is instantiated
3200 -- and there is an actual for the formal package. If the formal
3201 -- package has parameters, we build a regular package instance for
3202 -- it, that precedes the original formal package declaration.
3204 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
3206 Decl
: constant Node_Id
:=
3208 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
3210 if Nkind
(Decl
) = N_Formal_Package_Declaration
3211 or else (Nkind
(Decl
) = N_Package_Declaration
3212 and then Is_List_Member
(Decl
)
3213 and then Present
(Next
(Decl
))
3215 Nkind
(Next
(Decl
)) =
3216 N_Formal_Package_Declaration
)
3218 Needs_Body
:= False;
3224 -- If we are generating the calling stubs from the instantiation of
3225 -- a generic RCI package, we will not use the body of the generic
3228 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
3229 and then Is_Compilation_Unit
(Defining_Entity
(N
))
3231 Needs_Body
:= False;
3236 -- Here is a defence against a ludicrous number of instantiations
3237 -- caused by a circular set of instantiation attempts.
3239 if Pending_Instantiations
.Last
>
3240 Hostparm
.Max_Instantiations
3242 Error_Msg_N
("too many instantiations", N
);
3243 raise Unrecoverable_Error
;
3246 -- Indicate that the enclosing scopes contain an instantiation,
3247 -- and that cleanup actions should be delayed until after the
3248 -- instance body is expanded.
3250 Check_Forward_Instantiation
(Gen_Decl
);
3251 if Nkind
(N
) = N_Package_Instantiation
then
3253 Enclosing_Master
: Entity_Id
;
3256 -- Loop to search enclosing masters
3258 Enclosing_Master
:= Current_Scope
;
3259 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
3260 if Ekind
(Enclosing_Master
) = E_Package
then
3261 if Is_Compilation_Unit
(Enclosing_Master
) then
3262 if In_Package_Body
(Enclosing_Master
) then
3264 (Body_Entity
(Enclosing_Master
));
3273 Enclosing_Master
:= Scope
(Enclosing_Master
);
3276 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
3277 Enclosing_Master
:= Scope
(Enclosing_Master
);
3279 elsif Is_Generic_Subprogram
(Enclosing_Master
)
3280 or else Ekind
(Enclosing_Master
) = E_Void
3282 -- Cleanup actions will eventually be performed on the
3283 -- enclosing instance, if any. Enclosing scope is void
3284 -- in the formal part of a generic subprogram.
3289 if Ekind
(Enclosing_Master
) = E_Entry
3291 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
3293 if not Expander_Active
then
3297 Protected_Body_Subprogram
(Enclosing_Master
);
3301 Set_Delay_Cleanups
(Enclosing_Master
);
3303 while Ekind
(Enclosing_Master
) = E_Block
loop
3304 Enclosing_Master
:= Scope
(Enclosing_Master
);
3307 if Is_Subprogram
(Enclosing_Master
) then
3308 Delay_Descriptors
(Enclosing_Master
);
3310 elsif Is_Task_Type
(Enclosing_Master
) then
3312 TBP
: constant Node_Id
:=
3313 Get_Task_Body_Procedure
3316 if Present
(TBP
) then
3317 Delay_Descriptors
(TBP
);
3318 Set_Delay_Cleanups
(TBP
);
3325 end loop Scope_Loop
;
3328 -- Make entry in table
3330 Pending_Instantiations
.Append
3332 Act_Decl
=> Act_Decl
,
3333 Expander_Status
=> Expander_Active
,
3334 Current_Sem_Unit
=> Current_Sem_Unit
,
3335 Scope_Suppress
=> Scope_Suppress
,
3336 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
));
3340 Set_Categorization_From_Pragmas
(Act_Decl
);
3342 if Parent_Installed
then
3346 Set_Instance_Spec
(N
, Act_Decl
);
3348 -- If not a compilation unit, insert the package declaration before
3349 -- the original instantiation node.
3351 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3352 Mark_Rewrite_Insertion
(Act_Decl
);
3353 Insert_Before
(N
, Act_Decl
);
3356 -- For an instantiation that is a compilation unit, place declaration
3357 -- on current node so context is complete for analysis (including
3358 -- nested instantiations). If this is the main unit, the declaration
3359 -- eventually replaces the instantiation node. If the instance body
3360 -- is created later, it replaces the instance node, and the
3361 -- declaration is attached to it (see
3362 -- Build_Instance_Compilation_Unit_Nodes).
3365 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
3367 -- The entity for the current unit is the newly created one,
3368 -- and all semantic information is attached to it.
3370 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
3372 -- If this is the main unit, replace the main entity as well
3374 if Current_Sem_Unit
= Main_Unit
then
3375 Main_Unit_Entity
:= Act_Decl_Id
;
3379 Set_Unit
(Parent
(N
), Act_Decl
);
3380 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3381 Set_Package_Instantiation
(Act_Decl_Id
, N
);
3383 Set_Unit
(Parent
(N
), N
);
3384 Set_Body_Required
(Parent
(N
), False);
3386 -- We never need elaboration checks on instantiations, since by
3387 -- definition, the body instantiation is elaborated at the same
3388 -- time as the spec instantiation.
3390 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3391 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3394 Check_Elab_Instantiation
(N
);
3396 if ABE_Is_Certain
(N
) and then Needs_Body
then
3397 Pending_Instantiations
.Decrement_Last
;
3400 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3402 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
3403 First_Private_Entity
(Act_Decl_Id
));
3405 -- If the instantiation will receive a body, the unit will be
3406 -- transformed into a package body, and receive its own elaboration
3407 -- entity. Otherwise, the nature of the unit is now a package
3410 if Nkind
(Parent
(N
)) = N_Compilation_Unit
3411 and then not Needs_Body
3413 Rewrite
(N
, Act_Decl
);
3416 if Present
(Corresponding_Body
(Gen_Decl
))
3417 or else Unit_Requires_Body
(Gen_Unit
)
3419 Set_Has_Completion
(Act_Decl_Id
);
3422 Check_Formal_Packages
(Act_Decl_Id
);
3424 Restore_Private_Views
(Act_Decl_Id
);
3426 Inherit_Context
(Gen_Decl
, N
);
3428 if Parent_Installed
then
3433 Env_Installed
:= False;
3436 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3438 -- Check restriction, but skip this if something went wrong in the above
3439 -- analysis, indicated by Act_Decl_Id being void.
3441 if Ekind
(Act_Decl_Id
) /= E_Void
3442 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
3444 Check_Restriction
(No_Local_Allocators
, N
);
3448 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
3451 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3452 -- be used as defining identifiers for a formal package and for the
3453 -- corresponding expanded package.
3455 if Nkind
(N
) = N_Formal_Package_Declaration
then
3456 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3457 Set_Comes_From_Source
(Act_Decl_Id
, True);
3458 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
3459 Set_Defining_Identifier
(N
, Act_Decl_Id
);
3463 when Instantiation_Error
=>
3464 if Parent_Installed
then
3468 if Env_Installed
then
3471 end Analyze_Package_Instantiation
;
3473 --------------------------
3474 -- Inline_Instance_Body --
3475 --------------------------
3477 procedure Inline_Instance_Body
3479 Gen_Unit
: Entity_Id
;
3483 Gen_Comp
: constant Entity_Id
:=
3484 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
3485 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
3486 Curr_Scope
: Entity_Id
:= Empty
;
3487 Curr_Unit
: constant Entity_Id
:=
3488 Cunit_Entity
(Current_Sem_Unit
);
3489 Removed
: Boolean := False;
3490 Num_Scopes
: Int
:= 0;
3492 Scope_Stack_Depth
: constant Int
:=
3493 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
3495 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
3496 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3497 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3498 Num_Inner
: Int
:= 0;
3499 N_Instances
: Int
:= 0;
3503 -- Case of generic unit defined in another unit. We must remove the
3504 -- complete context of the current unit to install that of the generic.
3506 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
3508 -- Add some comments for the following two loops ???
3511 while Present
(S
) and then S
/= Standard_Standard
loop
3513 Num_Scopes
:= Num_Scopes
+ 1;
3515 Use_Clauses
(Num_Scopes
) :=
3517 (Scope_Stack
.Last
- Num_Scopes
+ 1).
3519 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
3521 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
3522 or else Scope_Stack
.Table
3523 (Scope_Stack
.Last
- Num_Scopes
).Entity
3527 exit when Is_Generic_Instance
(S
)
3528 and then (In_Package_Body
(S
)
3529 or else Ekind
(S
) = E_Procedure
3530 or else Ekind
(S
) = E_Function
);
3534 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
3536 -- Find and save all enclosing instances
3541 and then S
/= Standard_Standard
3543 if Is_Generic_Instance
(S
) then
3544 N_Instances
:= N_Instances
+ 1;
3545 Instances
(N_Instances
) := S
;
3547 exit when In_Package_Body
(S
);
3553 -- Remove context of current compilation unit, unless we are within a
3554 -- nested package instantiation, in which case the context has been
3555 -- removed previously.
3557 -- If current scope is the body of a child unit, remove context of
3558 -- spec as well. If an enclosing scope is an instance body, the
3559 -- context has already been removed, but the entities in the body
3560 -- must be made invisible as well.
3565 and then S
/= Standard_Standard
3567 if Is_Generic_Instance
(S
)
3568 and then (In_Package_Body
(S
)
3569 or else Ekind
(S
) = E_Procedure
3570 or else Ekind
(S
) = E_Function
)
3572 -- We still have to remove the entities of the enclosing
3573 -- instance from direct visibility.
3578 E
:= First_Entity
(S
);
3579 while Present
(E
) loop
3580 Set_Is_Immediately_Visible
(E
, False);
3589 or else (Ekind
(Curr_Unit
) = E_Package_Body
3590 and then S
= Spec_Entity
(Curr_Unit
))
3591 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3594 (Unit_Declaration_Node
(Curr_Unit
)))
3598 -- Remove entities in current scopes from visibility, so that
3599 -- instance body is compiled in a clean environment.
3601 Save_Scope_Stack
(Handle_Use
=> False);
3603 if Is_Child_Unit
(S
) then
3605 -- Remove child unit from stack, as well as inner scopes.
3606 -- Removing the context of a child unit removes parent units
3609 while Current_Scope
/= S
loop
3610 Num_Inner
:= Num_Inner
+ 1;
3611 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3616 Remove_Context
(Curr_Comp
);
3620 Remove_Context
(Curr_Comp
);
3623 if Ekind
(Curr_Unit
) = E_Package_Body
then
3624 Remove_Context
(Library_Unit
(Curr_Comp
));
3630 pragma Assert
(Num_Inner
< Num_Scopes
);
3632 Push_Scope
(Standard_Standard
);
3633 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3634 Instantiate_Package_Body
3637 Act_Decl
=> Act_Decl
,
3638 Expander_Status
=> Expander_Active
,
3639 Current_Sem_Unit
=> Current_Sem_Unit
,
3640 Scope_Suppress
=> Scope_Suppress
,
3641 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
)),
3642 Inlined_Body
=> True);
3648 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3650 -- Reset Generic_Instance flag so that use clauses can be installed
3651 -- in the proper order. (See Use_One_Package for effect of enclosing
3652 -- instances on processing of use clauses).
3654 for J
in 1 .. N_Instances
loop
3655 Set_Is_Generic_Instance
(Instances
(J
), False);
3659 Install_Context
(Curr_Comp
);
3661 if Present
(Curr_Scope
)
3662 and then Is_Child_Unit
(Curr_Scope
)
3664 Push_Scope
(Curr_Scope
);
3665 Set_Is_Immediately_Visible
(Curr_Scope
);
3667 -- Finally, restore inner scopes as well
3669 for J
in reverse 1 .. Num_Inner
loop
3670 Push_Scope
(Inner_Scopes
(J
));
3674 Restore_Scope_Stack
(Handle_Use
=> False);
3676 if Present
(Curr_Scope
)
3678 (In_Private_Part
(Curr_Scope
)
3679 or else In_Package_Body
(Curr_Scope
))
3681 -- Install private declaration of ancestor units, which are
3682 -- currently available. Restore_Scope_Stack and Install_Context
3683 -- only install the visible part of parents.
3688 Par
:= Scope
(Curr_Scope
);
3689 while (Present
(Par
))
3690 and then Par
/= Standard_Standard
3692 Install_Private_Declarations
(Par
);
3699 -- Restore use clauses. For a child unit, use clauses in the parents
3700 -- are restored when installing the context, so only those in inner
3701 -- scopes (and those local to the child unit itself) need to be
3702 -- installed explicitly.
3704 if Is_Child_Unit
(Curr_Unit
)
3707 for J
in reverse 1 .. Num_Inner
+ 1 loop
3708 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3710 Install_Use_Clauses
(Use_Clauses
(J
));
3714 for J
in reverse 1 .. Num_Scopes
loop
3715 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3717 Install_Use_Clauses
(Use_Clauses
(J
));
3721 -- Restore status of instances. If one of them is a body, make
3722 -- its local entities visible again.
3729 for J
in 1 .. N_Instances
loop
3730 Inst
:= Instances
(J
);
3731 Set_Is_Generic_Instance
(Inst
, True);
3733 if In_Package_Body
(Inst
)
3734 or else Ekind
(S
) = E_Procedure
3735 or else Ekind
(S
) = E_Function
3737 E
:= First_Entity
(Instances
(J
));
3738 while Present
(E
) loop
3739 Set_Is_Immediately_Visible
(E
);
3746 -- If generic unit is in current unit, current context is correct
3749 Instantiate_Package_Body
3752 Act_Decl
=> Act_Decl
,
3753 Expander_Status
=> Expander_Active
,
3754 Current_Sem_Unit
=> Current_Sem_Unit
,
3755 Scope_Suppress
=> Scope_Suppress
,
3756 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
)),
3757 Inlined_Body
=> True);
3759 end Inline_Instance_Body
;
3761 -------------------------------------
3762 -- Analyze_Procedure_Instantiation --
3763 -------------------------------------
3765 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3767 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3768 end Analyze_Procedure_Instantiation
;
3770 -----------------------------------
3771 -- Need_Subprogram_Instance_Body --
3772 -----------------------------------
3774 function Need_Subprogram_Instance_Body
3776 Subp
: Entity_Id
) return Boolean
3779 if (Is_In_Main_Unit
(N
)
3780 or else Is_Inlined
(Subp
)
3781 or else Is_Inlined
(Alias
(Subp
)))
3782 and then (Operating_Mode
= Generate_Code
3783 or else (Operating_Mode
= Check_Semantics
3784 and then ASIS_Mode
))
3785 and then (Expander_Active
or else ASIS_Mode
)
3786 and then not ABE_Is_Certain
(N
)
3787 and then not Is_Eliminated
(Subp
)
3789 Pending_Instantiations
.Append
3791 Act_Decl
=> Unit_Declaration_Node
(Subp
),
3792 Expander_Status
=> Expander_Active
,
3793 Current_Sem_Unit
=> Current_Sem_Unit
,
3794 Scope_Suppress
=> Scope_Suppress
,
3795 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
));
3800 end Need_Subprogram_Instance_Body
;
3802 --------------------------------------
3803 -- Analyze_Subprogram_Instantiation --
3804 --------------------------------------
3806 procedure Analyze_Subprogram_Instantiation
3810 Loc
: constant Source_Ptr
:= Sloc
(N
);
3811 Gen_Id
: constant Node_Id
:= Name
(N
);
3813 Anon_Id
: constant Entity_Id
:=
3814 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3815 Chars
=> New_External_Name
3816 (Chars
(Defining_Entity
(N
)), 'R'));
3818 Act_Decl_Id
: Entity_Id
;
3823 Env_Installed
: Boolean := False;
3824 Gen_Unit
: Entity_Id
;
3826 Pack_Id
: Entity_Id
;
3827 Parent_Installed
: Boolean := False;
3828 Renaming_List
: List_Id
;
3830 procedure Analyze_Instance_And_Renamings
;
3831 -- The instance must be analyzed in a context that includes the mappings
3832 -- of generic parameters into actuals. We create a package declaration
3833 -- for this purpose, and a subprogram with an internal name within the
3834 -- package. The subprogram instance is simply an alias for the internal
3835 -- subprogram, declared in the current scope.
3837 ------------------------------------
3838 -- Analyze_Instance_And_Renamings --
3839 ------------------------------------
3841 procedure Analyze_Instance_And_Renamings
is
3842 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3843 Pack_Decl
: Node_Id
;
3846 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3848 -- For the case of a compilation unit, the container package has
3849 -- the same name as the instantiation, to insure that the binder
3850 -- calls the elaboration procedure with the right name. Copy the
3851 -- entity of the instance, which may have compilation level flags
3852 -- (e.g. Is_Child_Unit) set.
3854 Pack_Id
:= New_Copy
(Def_Ent
);
3857 -- Otherwise we use the name of the instantiation concatenated
3858 -- with its source position to ensure uniqueness if there are
3859 -- several instantiations with the same name.
3862 Make_Defining_Identifier
(Loc
,
3863 Chars
=> New_External_Name
3864 (Related_Id
=> Chars
(Def_Ent
),
3866 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3869 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3870 Specification
=> Make_Package_Specification
(Loc
,
3871 Defining_Unit_Name
=> Pack_Id
,
3872 Visible_Declarations
=> Renaming_List
,
3873 End_Label
=> Empty
));
3875 Set_Instance_Spec
(N
, Pack_Decl
);
3876 Set_Is_Generic_Instance
(Pack_Id
);
3877 Set_Debug_Info_Needed
(Pack_Id
);
3879 -- Case of not a compilation unit
3881 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3882 Mark_Rewrite_Insertion
(Pack_Decl
);
3883 Insert_Before
(N
, Pack_Decl
);
3884 Set_Has_Completion
(Pack_Id
);
3886 -- Case of an instantiation that is a compilation unit
3888 -- Place declaration on current node so context is complete for
3889 -- analysis (including nested instantiations), and for use in a
3890 -- context_clause (see Analyze_With_Clause).
3893 Set_Unit
(Parent
(N
), Pack_Decl
);
3894 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3897 Analyze
(Pack_Decl
);
3898 Check_Formal_Packages
(Pack_Id
);
3899 Set_Is_Generic_Instance
(Pack_Id
, False);
3901 -- Body of the enclosing package is supplied when instantiating the
3902 -- subprogram body, after semantic analysis is completed.
3904 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3906 -- Remove package itself from visibility, so it does not
3907 -- conflict with subprogram.
3909 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3911 -- Set name and scope of internal subprogram so that the proper
3912 -- external name will be generated. The proper scope is the scope
3913 -- of the wrapper package. We need to generate debugging info for
3914 -- the internal subprogram, so set flag accordingly.
3916 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3917 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3919 -- Mark wrapper package as referenced, to avoid spurious warnings
3920 -- if the instantiation appears in various with_ clauses of
3921 -- subunits of the main unit.
3923 Set_Referenced
(Pack_Id
);
3926 Set_Is_Generic_Instance
(Anon_Id
);
3927 Set_Debug_Info_Needed
(Anon_Id
);
3928 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3930 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3931 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3932 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3933 Set_Comes_From_Source
(Act_Decl_Id
, True);
3935 -- The signature may involve types that are not frozen yet, but the
3936 -- subprogram will be frozen at the point the wrapper package is
3937 -- frozen, so it does not need its own freeze node. In fact, if one
3938 -- is created, it might conflict with the freezing actions from the
3941 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3943 -- If the instance is a child unit, mark the Id accordingly. Mark
3944 -- the anonymous entity as well, which is the real subprogram and
3945 -- which is used when the instance appears in a context clause.
3947 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3948 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3949 New_Overloaded_Entity
(Act_Decl_Id
);
3950 Check_Eliminated
(Act_Decl_Id
);
3952 -- In compilation unit case, kill elaboration checks on the
3953 -- instantiation, since they are never needed -- the body is
3954 -- instantiated at the same point as the spec.
3956 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3957 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3958 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3959 Set_Is_Compilation_Unit
(Anon_Id
);
3961 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3964 -- The instance is not a freezing point for the new subprogram
3966 Set_Is_Frozen
(Act_Decl_Id
, False);
3968 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3969 Valid_Operator_Definition
(Act_Decl_Id
);
3972 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3973 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3974 Set_Has_Completion
(Act_Decl_Id
);
3975 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3977 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3978 Set_Body_Required
(Parent
(N
), False);
3980 end Analyze_Instance_And_Renamings
;
3982 -- Start of processing for Analyze_Subprogram_Instantiation
3985 -- Very first thing: apply the special kludge for Text_IO processing
3986 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3987 -- Of course such an instantiation is bogus (these are packages, not
3988 -- subprograms), but we get a better error message if we do this.
3990 Text_IO_Kludge
(Gen_Id
);
3992 -- Make node global for error reporting
3994 Instantiation_Node
:= N
;
3995 Preanalyze_Actuals
(N
);
3998 Env_Installed
:= True;
3999 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4000 Gen_Unit
:= Entity
(Gen_Id
);
4002 Generate_Reference
(Gen_Unit
, Gen_Id
);
4004 if Nkind
(Gen_Id
) = N_Identifier
4005 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4008 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4011 if Etype
(Gen_Unit
) = Any_Type
then
4016 -- Verify that it is a generic subprogram of the right kind, and that
4017 -- it does not lead to a circular instantiation.
4019 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
4020 and then Ekind
(Gen_Unit
) /= E_Generic_Function
4022 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
4024 elsif In_Open_Scopes
(Gen_Unit
) then
4025 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4027 elsif K
= E_Procedure
4028 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
4030 if Ekind
(Gen_Unit
) = E_Generic_Function
then
4032 ("cannot instantiate generic function as procedure", Gen_Id
);
4035 ("expect name of generic procedure in instantiation", Gen_Id
);
4038 elsif K
= E_Function
4039 and then Ekind
(Gen_Unit
) /= E_Generic_Function
4041 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
4043 ("cannot instantiate generic procedure as function", Gen_Id
);
4046 ("expect name of generic function in instantiation", Gen_Id
);
4050 Set_Entity
(Gen_Id
, Gen_Unit
);
4051 Set_Is_Instantiated
(Gen_Unit
);
4053 if In_Extended_Main_Source_Unit
(N
) then
4054 Generate_Reference
(Gen_Unit
, N
);
4057 -- If renaming, get original unit
4059 if Present
(Renamed_Object
(Gen_Unit
))
4060 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
4062 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
4064 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4065 Set_Is_Instantiated
(Gen_Unit
);
4066 Generate_Reference
(Gen_Unit
, N
);
4069 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4070 Error_Msg_Node_2
:= Current_Scope
;
4072 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4073 Circularity_Detected
:= True;
4077 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4079 -- Initialize renamings map, for error checking
4081 Generic_Renamings
.Set_Last
(0);
4082 Generic_Renamings_HTable
.Reset
;
4084 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
4086 -- Copy original generic tree, to produce text for instantiation
4090 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4092 -- Inherit overriding indicator from instance node
4094 Act_Spec
:= Specification
(Act_Tree
);
4095 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
4096 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
4099 Analyze_Associations
4101 Generic_Formal_Declarations
(Act_Tree
),
4102 Generic_Formal_Declarations
(Gen_Decl
));
4104 -- The subprogram itself cannot contain a nested instance, so the
4105 -- current parent is left empty.
4107 Set_Instance_Env
(Gen_Unit
, Empty
);
4109 -- Build the subprogram declaration, which does not appear in the
4110 -- generic template, and give it a sloc consistent with that of the
4113 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
4114 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4116 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
4117 Specification
=> Act_Spec
);
4119 Set_Categorization_From_Pragmas
(Act_Decl
);
4121 if Parent_Installed
then
4125 Append
(Act_Decl
, Renaming_List
);
4126 Analyze_Instance_And_Renamings
;
4128 -- If the generic is marked Import (Intrinsic), then so is the
4129 -- instance. This indicates that there is no body to instantiate. If
4130 -- generic is marked inline, so it the instance, and the anonymous
4131 -- subprogram it renames. If inlined, or else if inlining is enabled
4132 -- for the compilation, we generate the instance body even if it is
4133 -- not within the main unit.
4135 -- Any other pragmas might also be inherited ???
4137 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
4138 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
4139 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
4141 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
4142 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
4146 Generate_Definition
(Act_Decl_Id
);
4148 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
4149 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
4151 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
4152 Check_Elab_Instantiation
(N
);
4155 if Is_Dispatching_Operation
(Act_Decl_Id
)
4156 and then Ada_Version
>= Ada_05
4162 Formal
:= First_Formal
(Act_Decl_Id
);
4163 while Present
(Formal
) loop
4164 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
4165 and then Is_Controlling_Formal
(Formal
)
4166 and then not Can_Never_Be_Null
(Formal
)
4168 Error_Msg_NE
("access parameter& is controlling,",
4170 Error_Msg_NE
("\corresponding parameter of & must be"
4171 & " explicitly null-excluding", N
, Gen_Id
);
4174 Next_Formal
(Formal
);
4179 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4181 -- Subject to change, pending on if other pragmas are inherited ???
4183 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4185 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
4186 Inherit_Context
(Gen_Decl
, N
);
4188 Restore_Private_Views
(Pack_Id
, False);
4190 -- If the context requires a full instantiation, mark node for
4191 -- subsequent construction of the body.
4193 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
4195 Check_Forward_Instantiation
(Gen_Decl
);
4197 -- The wrapper package is always delayed, because it does not
4198 -- constitute a freeze point, but to insure that the freeze
4199 -- node is placed properly, it is created directly when
4200 -- instantiating the body (otherwise the freeze node might
4201 -- appear to early for nested instantiations).
4203 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4205 -- For ASIS purposes, indicate that the wrapper package has
4206 -- replaced the instantiation node.
4208 Rewrite
(N
, Unit
(Parent
(N
)));
4209 Set_Unit
(Parent
(N
), N
);
4212 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4214 -- Replace instance node for library-level instantiations of
4215 -- intrinsic subprograms, for ASIS use.
4217 Rewrite
(N
, Unit
(Parent
(N
)));
4218 Set_Unit
(Parent
(N
), N
);
4221 if Parent_Installed
then
4226 Env_Installed
:= False;
4227 Generic_Renamings
.Set_Last
(0);
4228 Generic_Renamings_HTable
.Reset
;
4232 when Instantiation_Error
=>
4233 if Parent_Installed
then
4237 if Env_Installed
then
4240 end Analyze_Subprogram_Instantiation
;
4242 -------------------------
4243 -- Get_Associated_Node --
4244 -------------------------
4246 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
4250 Assoc
:= Associated_Node
(N
);
4252 if Nkind
(Assoc
) /= Nkind
(N
) then
4255 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
4259 -- If the node is part of an inner generic, it may itself have been
4260 -- remapped into a further generic copy. Associated_Node is otherwise
4261 -- used for the entity of the node, and will be of a different node
4262 -- kind, or else N has been rewritten as a literal or function call.
4264 while Present
(Associated_Node
(Assoc
))
4265 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
4267 Assoc
:= Associated_Node
(Assoc
);
4270 -- Follow and additional link in case the final node was rewritten.
4271 -- This can only happen with nested generic units.
4273 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
4274 and then Present
(Associated_Node
(Assoc
))
4275 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
4276 N_Explicit_Dereference
,
4281 Assoc
:= Associated_Node
(Assoc
);
4286 end Get_Associated_Node
;
4288 -------------------------------------------
4289 -- Build_Instance_Compilation_Unit_Nodes --
4290 -------------------------------------------
4292 procedure Build_Instance_Compilation_Unit_Nodes
4297 Decl_Cunit
: Node_Id
;
4298 Body_Cunit
: Node_Id
;
4300 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
4301 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
4304 -- A new compilation unit node is built for the instance declaration
4307 Make_Compilation_Unit
(Sloc
(N
),
4308 Context_Items
=> Empty_List
,
4311 Make_Compilation_Unit_Aux
(Sloc
(N
)));
4313 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4314 Set_Body_Required
(Decl_Cunit
, True);
4316 -- We use the original instantiation compilation unit as the resulting
4317 -- compilation unit of the instance, since this is the main unit.
4319 Rewrite
(N
, Act_Body
);
4320 Body_Cunit
:= Parent
(N
);
4322 -- The two compilation unit nodes are linked by the Library_Unit field
4324 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
4325 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
4327 -- Preserve the private nature of the package if needed
4329 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
4331 -- If the instance is not the main unit, its context, categorization,
4332 -- and elaboration entity are not relevant to the compilation.
4334 if Parent
(N
) /= Cunit
(Main_Unit
) then
4338 -- The context clause items on the instantiation, which are now attached
4339 -- to the body compilation unit (since the body overwrote the original
4340 -- instantiation node), semantically belong on the spec, so copy them
4341 -- there. It's harmless to leave them on the body as well. In fact one
4342 -- could argue that they belong in both places.
4344 Citem
:= First
(Context_Items
(Body_Cunit
));
4345 while Present
(Citem
) loop
4346 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
4350 -- Propagate categorization flags on packages, so that they appear in
4351 -- the ali file for the spec of the unit.
4353 if Ekind
(New_Main
) = E_Package
then
4354 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
4355 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
4356 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
4357 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
4358 Set_Is_Remote_Call_Interface
4359 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
4362 -- Make entry in Units table, so that binder can generate call to
4363 -- elaboration procedure for body, if any.
4365 Make_Instance_Unit
(Body_Cunit
);
4366 Main_Unit_Entity
:= New_Main
;
4367 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
4369 -- Build elaboration entity, since the instance may certainly generate
4370 -- elaboration code requiring a flag for protection.
4372 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
4373 end Build_Instance_Compilation_Unit_Nodes
;
4375 -----------------------------
4376 -- Check_Access_Definition --
4377 -----------------------------
4379 procedure Check_Access_Definition
(N
: Node_Id
) is
4382 (Ada_Version
>= Ada_05
4383 and then Present
(Access_Definition
(N
)));
4385 end Check_Access_Definition
;
4387 -----------------------------------
4388 -- Check_Formal_Package_Instance --
4389 -----------------------------------
4391 -- If the formal has specific parameters, they must match those of the
4392 -- actual. Both of them are instances, and the renaming declarations for
4393 -- their formal parameters appear in the same order in both. The analyzed
4394 -- formal has been analyzed in the context of the current instance.
4396 procedure Check_Formal_Package_Instance
4397 (Formal_Pack
: Entity_Id
;
4398 Actual_Pack
: Entity_Id
)
4400 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
4401 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
4406 procedure Check_Mismatch
(B
: Boolean);
4407 -- Common error routine for mismatch between the parameters of the
4408 -- actual instance and those of the formal package.
4410 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
4411 -- The formal may come from a nested formal package, and the actual may
4412 -- have been constant-folded. To determine whether the two denote the
4413 -- same entity we may have to traverse several definitions to recover
4414 -- the ultimate entity that they refer to.
4416 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
4417 -- Similarly, if the formal comes from a nested formal package, the
4418 -- actual may designate the formal through multiple renamings, which
4419 -- have to be followed to determine the original variable in question.
4421 --------------------
4422 -- Check_Mismatch --
4423 --------------------
4425 procedure Check_Mismatch
(B
: Boolean) is
4426 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
4429 if Kind
= N_Formal_Type_Declaration
then
4432 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
4433 N_Formal_Package_Declaration
)
4434 or else Kind
in N_Formal_Subprogram_Declaration
4440 ("actual for & in actual instance does not match formal",
4441 Parent
(Actual_Pack
), E1
);
4445 --------------------------------
4446 -- Same_Instantiated_Constant --
4447 --------------------------------
4449 function Same_Instantiated_Constant
4450 (E1
, E2
: Entity_Id
) return Boolean
4456 while Present
(Ent
) loop
4460 elsif Ekind
(Ent
) /= E_Constant
then
4463 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
4464 if Entity
(Constant_Value
(Ent
)) = E1
then
4467 Ent
:= Entity
(Constant_Value
(Ent
));
4470 -- The actual may be a constant that has been folded. Recover
4473 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
4474 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
4481 end Same_Instantiated_Constant
;
4483 --------------------------------
4484 -- Same_Instantiated_Variable --
4485 --------------------------------
4487 function Same_Instantiated_Variable
4488 (E1
, E2
: Entity_Id
) return Boolean
4490 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
4491 -- Follow chain of renamings to the ultimate ancestor
4493 ---------------------
4494 -- Original_Entity --
4495 ---------------------
4497 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
4502 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
4503 and then Present
(Renamed_Object
(Orig
))
4504 and then Is_Entity_Name
(Renamed_Object
(Orig
))
4506 Orig
:= Entity
(Renamed_Object
(Orig
));
4510 end Original_Entity
;
4512 -- Start of processing for Same_Instantiated_Variable
4515 return Ekind
(E1
) = Ekind
(E2
)
4516 and then Original_Entity
(E1
) = Original_Entity
(E2
);
4517 end Same_Instantiated_Variable
;
4519 -- Start of processing for Check_Formal_Package_Instance
4523 and then Present
(E2
)
4525 exit when Ekind
(E1
) = E_Package
4526 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
4528 -- If the formal is the renaming of the formal package, this
4529 -- is the end of its formal part, which may occur before the
4530 -- end of the formal part in the actual in the presence of
4531 -- defaulted parameters in the formal package.
4533 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
4534 and then Renamed_Entity
(E2
) = Scope
(E2
);
4536 -- The analysis of the actual may generate additional internal
4537 -- entities. If the formal is defaulted, there is no corresponding
4538 -- analysis and the internal entities must be skipped, until we
4539 -- find corresponding entities again.
4541 if Comes_From_Source
(E2
)
4542 and then not Comes_From_Source
(E1
)
4543 and then Chars
(E1
) /= Chars
(E2
)
4546 and then Chars
(E1
) /= Chars
(E2
)
4555 -- If the formal entity comes from a formal declaration, it was
4556 -- defaulted in the formal package, and no check is needed on it.
4558 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
4561 elsif Is_Type
(E1
) then
4563 -- Subtypes must statically match. E1, E2 are the local entities
4564 -- that are subtypes of the actuals. Itypes generated for other
4565 -- parameters need not be checked, the check will be performed
4566 -- on the parameters themselves.
4568 -- If E2 is a formal type declaration, it is a defaulted parameter
4569 -- and needs no checking.
4571 if not Is_Itype
(E1
)
4572 and then not Is_Itype
(E2
)
4576 or else Etype
(E1
) /= Etype
(E2
)
4577 or else not Subtypes_Statically_Match
(E1
, E2
));
4580 elsif Ekind
(E1
) = E_Constant
then
4582 -- IN parameters must denote the same static value, or the same
4583 -- constant, or the literal null.
4585 Expr1
:= Expression
(Parent
(E1
));
4587 if Ekind
(E2
) /= E_Constant
then
4588 Check_Mismatch
(True);
4591 Expr2
:= Expression
(Parent
(E2
));
4594 if Is_Static_Expression
(Expr1
) then
4596 if not Is_Static_Expression
(Expr2
) then
4597 Check_Mismatch
(True);
4599 elsif Is_Discrete_Type
(Etype
(E1
)) then
4601 V1
: constant Uint
:= Expr_Value
(Expr1
);
4602 V2
: constant Uint
:= Expr_Value
(Expr2
);
4604 Check_Mismatch
(V1
/= V2
);
4607 elsif Is_Real_Type
(Etype
(E1
)) then
4609 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
4610 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
4612 Check_Mismatch
(V1
/= V2
);
4615 elsif Is_String_Type
(Etype
(E1
))
4616 and then Nkind
(Expr1
) = N_String_Literal
4618 if Nkind
(Expr2
) /= N_String_Literal
then
4619 Check_Mismatch
(True);
4622 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
4626 elsif Is_Entity_Name
(Expr1
) then
4627 if Is_Entity_Name
(Expr2
) then
4628 if Entity
(Expr1
) = Entity
(Expr2
) then
4632 (not Same_Instantiated_Constant
4633 (Entity
(Expr1
), Entity
(Expr2
)));
4636 Check_Mismatch
(True);
4639 elsif Is_Entity_Name
(Original_Node
(Expr1
))
4640 and then Is_Entity_Name
(Expr2
)
4642 Same_Instantiated_Constant
4643 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
4647 elsif Nkind
(Expr1
) = N_Null
then
4648 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
4651 Check_Mismatch
(True);
4654 elsif Ekind
(E1
) = E_Variable
then
4655 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
4657 elsif Ekind
(E1
) = E_Package
then
4659 (Ekind
(E1
) /= Ekind
(E2
)
4660 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
4662 elsif Is_Overloadable
(E1
) then
4664 -- Verify that the actual subprograms match. Note that actuals
4665 -- that are attributes are rewritten as subprograms. If the
4666 -- subprogram in the formal package is defaulted, no check is
4667 -- needed. Note that this can only happen in Ada 2005 when the
4668 -- formal package can be partially parametrized.
4670 if Nkind
(Unit_Declaration_Node
(E1
)) =
4671 N_Subprogram_Renaming_Declaration
4672 and then From_Default
(Unit_Declaration_Node
(E1
))
4678 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
4682 raise Program_Error
;
4689 end Check_Formal_Package_Instance
;
4691 ---------------------------
4692 -- Check_Formal_Packages --
4693 ---------------------------
4695 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
4697 Formal_P
: Entity_Id
;
4700 -- Iterate through the declarations in the instance, looking for package
4701 -- renaming declarations that denote instances of formal packages. Stop
4702 -- when we find the renaming of the current package itself. The
4703 -- declaration for a formal package without a box is followed by an
4704 -- internal entity that repeats the instantiation.
4706 E
:= First_Entity
(P_Id
);
4707 while Present
(E
) loop
4708 if Ekind
(E
) = E_Package
then
4709 if Renamed_Object
(E
) = P_Id
then
4712 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4715 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4716 Formal_P
:= Next_Entity
(E
);
4717 Check_Formal_Package_Instance
(Formal_P
, E
);
4719 -- After checking, remove the internal validating package. It
4720 -- is only needed for semantic checks, and as it may contain
4721 -- generic formal declarations it should not reach gigi.
4723 Remove
(Unit_Declaration_Node
(Formal_P
));
4729 end Check_Formal_Packages
;
4731 ---------------------------------
4732 -- Check_Forward_Instantiation --
4733 ---------------------------------
4735 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
4737 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
4740 -- The instantiation appears before the generic body if we are in the
4741 -- scope of the unit containing the generic, either in its spec or in
4742 -- the package body, and before the generic body.
4744 if Ekind
(Gen_Comp
) = E_Package_Body
then
4745 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
4748 if In_Open_Scopes
(Gen_Comp
)
4749 and then No
(Corresponding_Body
(Decl
))
4754 and then not Is_Compilation_Unit
(S
)
4755 and then not Is_Child_Unit
(S
)
4757 if Ekind
(S
) = E_Package
then
4758 Set_Has_Forward_Instantiation
(S
);
4764 end Check_Forward_Instantiation
;
4766 ---------------------------
4767 -- Check_Generic_Actuals --
4768 ---------------------------
4770 -- The visibility of the actuals may be different between the point of
4771 -- generic instantiation and the instantiation of the body.
4773 procedure Check_Generic_Actuals
4774 (Instance
: Entity_Id
;
4775 Is_Formal_Box
: Boolean)
4780 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4781 -- For a formal that is an array type, the component type is often a
4782 -- previous formal in the same unit. The privacy status of the component
4783 -- type will have been examined earlier in the traversal of the
4784 -- corresponding actuals, and this status should not be modified for the
4785 -- array type itself.
4787 -- To detect this case we have to rescan the list of formals, which
4788 -- is usually short enough to ignore the resulting inefficiency.
4790 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4793 Prev
:= First_Entity
(Instance
);
4794 while Present
(Prev
) loop
4796 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4797 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4798 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4808 end Denotes_Previous_Actual
;
4810 -- Start of processing for Check_Generic_Actuals
4813 E
:= First_Entity
(Instance
);
4814 while Present
(E
) loop
4816 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4817 and then Scope
(Etype
(E
)) /= Instance
4818 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4820 if Is_Array_Type
(E
)
4821 and then Denotes_Previous_Actual
(Component_Type
(E
))
4825 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4827 Set_Is_Generic_Actual_Type
(E
, True);
4828 Set_Is_Hidden
(E
, False);
4829 Set_Is_Potentially_Use_Visible
(E
,
4832 -- We constructed the generic actual type as a subtype of the
4833 -- supplied type. This means that it normally would not inherit
4834 -- subtype specific attributes of the actual, which is wrong for
4835 -- the generic case.
4837 Astype
:= Ancestor_Subtype
(E
);
4841 -- This can happen when E is an itype that is the full view of
4842 -- a private type completed, e.g. with a constrained array. In
4843 -- that case, use the first subtype, which will carry size
4844 -- information. The base type itself is unconstrained and will
4847 Astype
:= First_Subtype
(E
);
4850 Set_Size_Info
(E
, (Astype
));
4851 Set_RM_Size
(E
, RM_Size
(Astype
));
4852 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4854 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4855 Set_RM_Size
(E
, RM_Size
(Astype
));
4857 -- In nested instances, the base type of an access actual
4858 -- may itself be private, and need to be exchanged.
4860 elsif Is_Access_Type
(E
)
4861 and then Is_Private_Type
(Etype
(E
))
4864 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4867 elsif Ekind
(E
) = E_Package
then
4869 -- If this is the renaming for the current instance, we're done.
4870 -- Otherwise it is a formal package. If the corresponding formal
4871 -- was declared with a box, the (instantiations of the) generic
4872 -- formal part are also visible. Otherwise, ignore the entity
4873 -- created to validate the actuals.
4875 if Renamed_Object
(E
) = Instance
then
4878 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4881 -- The visibility of a formal of an enclosing generic is already
4884 elsif Denotes_Formal_Package
(E
) then
4887 elsif Present
(Associated_Formal_Package
(E
))
4888 and then not Is_Generic_Formal
(E
)
4890 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4891 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4894 Check_Generic_Actuals
(Renamed_Object
(E
), False);
4897 Set_Is_Hidden
(E
, False);
4900 -- If this is a subprogram instance (in a wrapper package) the
4901 -- actual is fully visible.
4903 elsif Is_Wrapper_Package
(Instance
) then
4904 Set_Is_Hidden
(E
, False);
4906 -- If the formal package is declared with a box, or if the formal
4907 -- parameter is defaulted, it is visible in the body.
4910 or else Is_Visible_Formal
(E
)
4912 Set_Is_Hidden
(E
, False);
4917 end Check_Generic_Actuals
;
4919 ------------------------------
4920 -- Check_Generic_Child_Unit --
4921 ------------------------------
4923 procedure Check_Generic_Child_Unit
4925 Parent_Installed
: in out Boolean)
4927 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4928 Gen_Par
: Entity_Id
:= Empty
;
4930 Inst_Par
: Entity_Id
;
4933 function Find_Generic_Child
4935 Id
: Node_Id
) return Entity_Id
;
4936 -- Search generic parent for possible child unit with the given name
4938 function In_Enclosing_Instance
return Boolean;
4939 -- Within an instance of the parent, the child unit may be denoted
4940 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4941 -- scopes to locate a possible parent instantiation.
4943 ------------------------
4944 -- Find_Generic_Child --
4945 ------------------------
4947 function Find_Generic_Child
4949 Id
: Node_Id
) return Entity_Id
4954 -- If entity of name is already set, instance has already been
4955 -- resolved, e.g. in an enclosing instantiation.
4957 if Present
(Entity
(Id
)) then
4958 if Scope
(Entity
(Id
)) = Scop
then
4965 E
:= First_Entity
(Scop
);
4966 while Present
(E
) loop
4967 if Chars
(E
) = Chars
(Id
)
4968 and then Is_Child_Unit
(E
)
4970 if Is_Child_Unit
(E
)
4971 and then not Is_Visible_Child_Unit
(E
)
4974 ("generic child unit& is not visible", Gen_Id
, E
);
4986 end Find_Generic_Child
;
4988 ---------------------------
4989 -- In_Enclosing_Instance --
4990 ---------------------------
4992 function In_Enclosing_Instance
return Boolean is
4993 Enclosing_Instance
: Node_Id
;
4994 Instance_Decl
: Node_Id
;
4997 -- We do not inline any call that contains instantiations, except
4998 -- for instantiations of Unchecked_Conversion, so if we are within
4999 -- an inlined body the current instance does not require parents.
5001 if In_Inlined_Body
then
5002 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
5006 -- Loop to check enclosing scopes
5008 Enclosing_Instance
:= Current_Scope
;
5009 while Present
(Enclosing_Instance
) loop
5010 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
5012 if Ekind
(Enclosing_Instance
) = E_Package
5013 and then Is_Generic_Instance
(Enclosing_Instance
)
5015 (Generic_Parent
(Specification
(Instance_Decl
)))
5017 -- Check whether the generic we are looking for is a child of
5020 E
:= Find_Generic_Child
5021 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
5022 exit when Present
(E
);
5028 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
5040 Make_Expanded_Name
(Loc
,
5042 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
5043 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
5045 Set_Entity
(Gen_Id
, E
);
5046 Set_Etype
(Gen_Id
, Etype
(E
));
5047 Parent_Installed
:= False; -- Already in scope.
5050 end In_Enclosing_Instance
;
5052 -- Start of processing for Check_Generic_Child_Unit
5055 -- If the name of the generic is given by a selected component, it may
5056 -- be the name of a generic child unit, and the prefix is the name of an
5057 -- instance of the parent, in which case the child unit must be visible.
5058 -- If this instance is not in scope, it must be placed there and removed
5059 -- after instantiation, because what is being instantiated is not the
5060 -- original child, but the corresponding child present in the instance
5063 -- If the child is instantiated within the parent, it can be given by
5064 -- a simple name. In this case the instance is already in scope, but
5065 -- the child generic must be recovered from the generic parent as well.
5067 if Nkind
(Gen_Id
) = N_Selected_Component
then
5068 S
:= Selector_Name
(Gen_Id
);
5069 Analyze
(Prefix
(Gen_Id
));
5070 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5072 if Ekind
(Inst_Par
) = E_Package
5073 and then Present
(Renamed_Object
(Inst_Par
))
5075 Inst_Par
:= Renamed_Object
(Inst_Par
);
5078 if Ekind
(Inst_Par
) = E_Package
then
5079 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
5080 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
5082 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
5084 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
5086 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
5089 elsif Ekind
(Inst_Par
) = E_Generic_Package
5090 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
5092 -- A formal package may be a real child package, and not the
5093 -- implicit instance within a parent. In this case the child is
5094 -- not visible and has to be retrieved explicitly as well.
5096 Gen_Par
:= Inst_Par
;
5099 if Present
(Gen_Par
) then
5101 -- The prefix denotes an instantiation. The entity itself may be a
5102 -- nested generic, or a child unit.
5104 E
:= Find_Generic_Child
(Gen_Par
, S
);
5107 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
5108 Set_Entity
(Gen_Id
, E
);
5109 Set_Etype
(Gen_Id
, Etype
(E
));
5111 Set_Etype
(S
, Etype
(E
));
5113 -- Indicate that this is a reference to the parent
5115 if In_Extended_Main_Source_Unit
(Gen_Id
) then
5116 Set_Is_Instantiated
(Inst_Par
);
5119 -- A common mistake is to replicate the naming scheme of a
5120 -- hierarchy by instantiating a generic child directly, rather
5121 -- than the implicit child in a parent instance:
5123 -- generic .. package Gpar is ..
5124 -- generic .. package Gpar.Child is ..
5125 -- package Par is new Gpar ();
5128 -- package Par.Child is new Gpar.Child ();
5129 -- rather than Par.Child
5131 -- In this case the instantiation is within Par, which is an
5132 -- instance, but Gpar does not denote Par because we are not IN
5133 -- the instance of Gpar, so this is illegal. The test below
5134 -- recognizes this particular case.
5136 if Is_Child_Unit
(E
)
5137 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
5138 and then (not In_Instance
5139 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
5143 ("prefix of generic child unit must be instance of parent",
5147 if not In_Open_Scopes
(Inst_Par
)
5148 and then Nkind
(Parent
(Gen_Id
)) not in
5149 N_Generic_Renaming_Declaration
5151 Install_Parent
(Inst_Par
);
5152 Parent_Installed
:= True;
5154 elsif In_Open_Scopes
(Inst_Par
) then
5156 -- If the parent is already installed verify that the
5157 -- actuals for its formal packages declared with a box
5158 -- are already installed. This is necessary when the
5159 -- child instance is a child of the parent instance.
5160 -- In this case the parent is placed on the scope stack
5161 -- but the formal packages are not made visible.
5163 Install_Formal_Packages
(Inst_Par
);
5167 -- If the generic parent does not contain an entity that
5168 -- corresponds to the selector, the instance doesn't either.
5169 -- Analyzing the node will yield the appropriate error message.
5170 -- If the entity is not a child unit, then it is an inner
5171 -- generic in the parent.
5179 if Is_Child_Unit
(Entity
(Gen_Id
))
5181 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5182 and then not In_Open_Scopes
(Inst_Par
)
5184 Install_Parent
(Inst_Par
);
5185 Parent_Installed
:= True;
5189 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
5191 -- Entity already present, analyze prefix, whose meaning may be
5192 -- an instance in the current context. If it is an instance of
5193 -- a relative within another, the proper parent may still have
5194 -- to be installed, if they are not of the same generation.
5196 Analyze
(Prefix
(Gen_Id
));
5198 -- In the unlikely case that a local declaration hides the name
5199 -- of the parent package, locate it on the homonym chain. If the
5200 -- context is an instance of the parent, the renaming entity is
5203 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5204 while Present
(Inst_Par
)
5205 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
5207 Inst_Par
:= Homonym
(Inst_Par
);
5210 pragma Assert
(Present
(Inst_Par
));
5211 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
5213 if In_Enclosing_Instance
then
5216 elsif Present
(Entity
(Gen_Id
))
5217 and then Is_Child_Unit
(Entity
(Gen_Id
))
5218 and then not In_Open_Scopes
(Inst_Par
)
5220 Install_Parent
(Inst_Par
);
5221 Parent_Installed
:= True;
5224 elsif In_Enclosing_Instance
then
5226 -- The child unit is found in some enclosing scope
5233 -- If this is the renaming of the implicit child in a parent
5234 -- instance, recover the parent name and install it.
5236 if Is_Entity_Name
(Gen_Id
) then
5237 E
:= Entity
(Gen_Id
);
5239 if Is_Generic_Unit
(E
)
5240 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
5241 and then Is_Child_Unit
(Renamed_Object
(E
))
5242 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
5243 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
5246 New_Copy_Tree
(Name
(Parent
(E
))));
5247 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5249 if not In_Open_Scopes
(Inst_Par
) then
5250 Install_Parent
(Inst_Par
);
5251 Parent_Installed
:= True;
5254 -- If it is a child unit of a non-generic parent, it may be
5255 -- use-visible and given by a direct name. Install parent as
5258 elsif Is_Generic_Unit
(E
)
5259 and then Is_Child_Unit
(E
)
5261 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5262 and then not Is_Generic_Unit
(Scope
(E
))
5264 if not In_Open_Scopes
(Scope
(E
)) then
5265 Install_Parent
(Scope
(E
));
5266 Parent_Installed
:= True;
5271 end Check_Generic_Child_Unit
;
5273 -----------------------------
5274 -- Check_Hidden_Child_Unit --
5275 -----------------------------
5277 procedure Check_Hidden_Child_Unit
5279 Gen_Unit
: Entity_Id
;
5280 Act_Decl_Id
: Entity_Id
)
5282 Gen_Id
: constant Node_Id
:= Name
(N
);
5285 if Is_Child_Unit
(Gen_Unit
)
5286 and then Is_Child_Unit
(Act_Decl_Id
)
5287 and then Nkind
(Gen_Id
) = N_Expanded_Name
5288 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
5289 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
5291 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
5293 ("generic unit & is implicitly declared in &",
5294 Defining_Unit_Name
(N
), Gen_Unit
);
5295 Error_Msg_N
("\instance must have different name",
5296 Defining_Unit_Name
(N
));
5298 end Check_Hidden_Child_Unit
;
5300 ------------------------
5301 -- Check_Private_View --
5302 ------------------------
5304 procedure Check_Private_View
(N
: Node_Id
) is
5305 T
: constant Entity_Id
:= Etype
(N
);
5309 -- Exchange views if the type was not private in the generic but is
5310 -- private at the point of instantiation. Do not exchange views if
5311 -- the scope of the type is in scope. This can happen if both generic
5312 -- and instance are sibling units, or if type is defined in a parent.
5313 -- In this case the visibility of the type will be correct for all
5317 BT
:= Base_Type
(T
);
5319 if Is_Private_Type
(T
)
5320 and then not Has_Private_View
(N
)
5321 and then Present
(Full_View
(T
))
5322 and then not In_Open_Scopes
(Scope
(T
))
5324 -- In the generic, the full type was visible. Save the private
5325 -- entity, for subsequent exchange.
5329 elsif Has_Private_View
(N
)
5330 and then not Is_Private_Type
(T
)
5331 and then not Has_Been_Exchanged
(T
)
5332 and then Etype
(Get_Associated_Node
(N
)) /= T
5334 -- Only the private declaration was visible in the generic. If
5335 -- the type appears in a subtype declaration, the subtype in the
5336 -- instance must have a view compatible with that of its parent,
5337 -- which must be exchanged (see corresponding code in Restore_
5338 -- Private_Views). Otherwise, if the type is defined in a parent
5339 -- unit, leave full visibility within instance, which is safe.
5341 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
5342 and then not Is_Private_Type
(Base_Type
(T
))
5343 and then Comes_From_Source
(Base_Type
(T
))
5347 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
5348 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
5350 Prepend_Elmt
(T
, Exchanged_Views
);
5351 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
5354 -- For composite types with inconsistent representation exchange
5355 -- component types accordingly.
5357 elsif Is_Access_Type
(T
)
5358 and then Is_Private_Type
(Designated_Type
(T
))
5359 and then not Has_Private_View
(N
)
5360 and then Present
(Full_View
(Designated_Type
(T
)))
5362 Switch_View
(Designated_Type
(T
));
5364 elsif Is_Array_Type
(T
) then
5365 if Is_Private_Type
(Component_Type
(T
))
5366 and then not Has_Private_View
(N
)
5367 and then Present
(Full_View
(Component_Type
(T
)))
5369 Switch_View
(Component_Type
(T
));
5372 -- The normal exchange mechanism relies on the setting of a
5373 -- flag on the reference in the generic. However, an additional
5374 -- mechanism is needed for types that are not explicitly mentioned
5375 -- in the generic, but may be needed in expanded code in the
5376 -- instance. This includes component types of arrays and
5377 -- designated types of access types. This processing must also
5378 -- include the index types of arrays which we take care of here.
5385 Indx
:= First_Index
(T
);
5386 Typ
:= Base_Type
(Etype
(Indx
));
5387 while Present
(Indx
) loop
5388 if Is_Private_Type
(Typ
)
5389 and then Present
(Full_View
(Typ
))
5398 elsif Is_Private_Type
(T
)
5399 and then Present
(Full_View
(T
))
5400 and then Is_Array_Type
(Full_View
(T
))
5401 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
5405 -- Finally, a non-private subtype may have a private base type, which
5406 -- must be exchanged for consistency. This can happen when a package
5407 -- body is instantiated, when the scope stack is empty but in fact
5408 -- the subtype and the base type are declared in an enclosing scope.
5410 -- Note that in this case we introduce an inconsistency in the view
5411 -- set, because we switch the base type BT, but there could be some
5412 -- private dependent subtypes of BT which remain unswitched. Such
5413 -- subtypes might need to be switched at a later point (see specific
5414 -- provision for that case in Switch_View).
5416 elsif not Is_Private_Type
(T
)
5417 and then not Has_Private_View
(N
)
5418 and then Is_Private_Type
(BT
)
5419 and then Present
(Full_View
(BT
))
5420 and then not Is_Generic_Type
(BT
)
5421 and then not In_Open_Scopes
(BT
)
5423 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
5424 Exchange_Declarations
(BT
);
5427 end Check_Private_View
;
5429 --------------------------
5430 -- Contains_Instance_Of --
5431 --------------------------
5433 function Contains_Instance_Of
5436 N
: Node_Id
) return Boolean
5444 -- Verify that there are no circular instantiations. We check whether
5445 -- the unit contains an instance of the current scope or some enclosing
5446 -- scope (in case one of the instances appears in a subunit). Longer
5447 -- circularities involving subunits might seem too pathological to
5448 -- consider, but they were not too pathological for the authors of
5449 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5450 -- enclosing generic scopes as containing an instance.
5453 -- Within a generic subprogram body, the scope is not generic, to
5454 -- allow for recursive subprograms. Use the declaration to determine
5455 -- whether this is a generic unit.
5457 if Ekind
(Scop
) = E_Generic_Package
5458 or else (Is_Subprogram
(Scop
)
5459 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
5460 N_Generic_Subprogram_Declaration
)
5462 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
5464 while Present
(Elmt
) loop
5465 if Node
(Elmt
) = Scop
then
5466 Error_Msg_Node_2
:= Inner
;
5468 ("circular Instantiation: & instantiated within &!",
5472 elsif Node
(Elmt
) = Inner
then
5475 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
5476 Error_Msg_Node_2
:= Inner
;
5478 ("circular Instantiation: & instantiated within &!",
5486 -- Indicate that Inner is being instantiated within Scop
5488 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
5491 if Scop
= Standard_Standard
then
5494 Scop
:= Scope
(Scop
);
5499 end Contains_Instance_Of
;
5501 -----------------------
5502 -- Copy_Generic_Node --
5503 -----------------------
5505 function Copy_Generic_Node
5507 Parent_Id
: Node_Id
;
5508 Instantiating
: Boolean) return Node_Id
5513 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
5514 -- Check the given value of one of the Fields referenced by the
5515 -- current node to determine whether to copy it recursively. The
5516 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5517 -- value (Sloc, Uint, Char) in which case it need not be copied.
5519 procedure Copy_Descendants
;
5520 -- Common utility for various nodes
5522 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
5523 -- Make copy of element list
5525 function Copy_Generic_List
5527 Parent_Id
: Node_Id
) return List_Id
;
5528 -- Apply Copy_Node recursively to the members of a node list
5530 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
5531 -- True if an identifier is part of the defining program unit name
5532 -- of a child unit. The entity of such an identifier must be kept
5533 -- (for ASIS use) even though as the name of an enclosing generic
5534 -- it would otherwise not be preserved in the generic tree.
5536 ----------------------
5537 -- Copy_Descendants --
5538 ----------------------
5540 procedure Copy_Descendants
is
5542 use Atree
.Unchecked_Access
;
5543 -- This code section is part of the implementation of an untyped
5544 -- tree traversal, so it needs direct access to node fields.
5547 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5548 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5549 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5550 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
5551 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5552 end Copy_Descendants
;
5554 -----------------------------
5555 -- Copy_Generic_Descendant --
5556 -----------------------------
5558 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
5560 if D
= Union_Id
(Empty
) then
5563 elsif D
in Node_Range
then
5565 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
5567 elsif D
in List_Range
then
5568 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
5570 elsif D
in Elist_Range
then
5571 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
5573 -- Nothing else is copyable (e.g. Uint values), return as is
5578 end Copy_Generic_Descendant
;
5580 ------------------------
5581 -- Copy_Generic_Elist --
5582 ------------------------
5584 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
5591 M
:= First_Elmt
(E
);
5592 while Present
(M
) loop
5594 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
5603 end Copy_Generic_Elist
;
5605 -----------------------
5606 -- Copy_Generic_List --
5607 -----------------------
5609 function Copy_Generic_List
5611 Parent_Id
: Node_Id
) return List_Id
5619 Set_Parent
(New_L
, Parent_Id
);
5622 while Present
(N
) loop
5623 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
5632 end Copy_Generic_List
;
5634 ---------------------------
5635 -- In_Defining_Unit_Name --
5636 ---------------------------
5638 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
5640 return Present
(Parent
(Nam
))
5641 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
5643 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
5644 and then In_Defining_Unit_Name
(Parent
(Nam
))));
5645 end In_Defining_Unit_Name
;
5647 -- Start of processing for Copy_Generic_Node
5654 New_N
:= New_Copy
(N
);
5656 if Instantiating
then
5657 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
5660 if not Is_List_Member
(N
) then
5661 Set_Parent
(New_N
, Parent_Id
);
5664 -- If defining identifier, then all fields have been copied already
5666 if Nkind
(New_N
) in N_Entity
then
5669 -- Special casing for identifiers and other entity names and operators
5671 elsif Nkind_In
(New_N
, N_Identifier
,
5672 N_Character_Literal
,
5675 or else Nkind
(New_N
) in N_Op
5677 if not Instantiating
then
5679 -- Link both nodes in order to assign subsequently the
5680 -- entity of the copy to the original node, in case this
5681 -- is a global reference.
5683 Set_Associated_Node
(N
, New_N
);
5685 -- If we are within an instantiation, this is a nested generic
5686 -- that has already been analyzed at the point of definition. We
5687 -- must preserve references that were global to the enclosing
5688 -- parent at that point. Other occurrences, whether global or
5689 -- local to the current generic, must be resolved anew, so we
5690 -- reset the entity in the generic copy. A global reference has a
5691 -- smaller depth than the parent, or else the same depth in case
5692 -- both are distinct compilation units.
5693 -- A child unit is implicitly declared within the enclosing parent
5694 -- but is in fact global to it, and must be preserved.
5696 -- It is also possible for Current_Instantiated_Parent to be
5697 -- defined, and for this not to be a nested generic, namely if the
5698 -- unit is loaded through Rtsfind. In that case, the entity of
5699 -- New_N is only a link to the associated node, and not a defining
5702 -- The entities for parent units in the defining_program_unit of a
5703 -- generic child unit are established when the context of the unit
5704 -- is first analyzed, before the generic copy is made. They are
5705 -- preserved in the copy for use in ASIS queries.
5707 Ent
:= Entity
(New_N
);
5709 if No
(Current_Instantiated_Parent
.Gen_Id
) then
5711 or else Nkind
(Ent
) /= N_Defining_Identifier
5712 or else not In_Defining_Unit_Name
(N
)
5714 Set_Associated_Node
(New_N
, Empty
);
5719 not Nkind_In
(Ent
, N_Defining_Identifier
,
5720 N_Defining_Character_Literal
,
5721 N_Defining_Operator_Symbol
)
5722 or else No
(Scope
(Ent
))
5724 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
5725 and then not Is_Child_Unit
(Ent
))
5727 (Scope_Depth
(Scope
(Ent
)) >
5728 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
5730 Get_Source_Unit
(Ent
) =
5731 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
5733 Set_Associated_Node
(New_N
, Empty
);
5736 -- Case of instantiating identifier or some other name or operator
5739 -- If the associated node is still defined, the entity in it is
5740 -- global, and must be copied to the instance. If this copy is
5741 -- being made for a body to inline, it is applied to an
5742 -- instantiated tree, and the entity is already present and must
5743 -- be also preserved.
5746 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
5749 if Present
(Assoc
) then
5750 if Nkind
(Assoc
) = Nkind
(N
) then
5751 Set_Entity
(New_N
, Entity
(Assoc
));
5752 Check_Private_View
(N
);
5754 elsif Nkind
(Assoc
) = N_Function_Call
then
5755 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
5757 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
5758 N_Defining_Character_Literal
,
5759 N_Defining_Operator_Symbol
)
5760 and then Expander_Active
5762 -- Inlining case: we are copying a tree that contains
5763 -- global entities, which are preserved in the copy to be
5764 -- used for subsequent inlining.
5769 Set_Entity
(New_N
, Empty
);
5775 -- For expanded name, we must copy the Prefix and Selector_Name
5777 if Nkind
(N
) = N_Expanded_Name
then
5779 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
5781 Set_Selector_Name
(New_N
,
5782 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
5784 -- For operators, we must copy the right operand
5786 elsif Nkind
(N
) in N_Op
then
5787 Set_Right_Opnd
(New_N
,
5788 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
5790 -- And for binary operators, the left operand as well
5792 if Nkind
(N
) in N_Binary_Op
then
5793 Set_Left_Opnd
(New_N
,
5794 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
5798 -- Special casing for stubs
5800 elsif Nkind
(N
) in N_Body_Stub
then
5802 -- In any case, we must copy the specification or defining
5803 -- identifier as appropriate.
5805 if Nkind
(N
) = N_Subprogram_Body_Stub
then
5806 Set_Specification
(New_N
,
5807 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
5810 Set_Defining_Identifier
(New_N
,
5812 (Defining_Identifier
(N
), New_N
, Instantiating
));
5815 -- If we are not instantiating, then this is where we load and
5816 -- analyze subunits, i.e. at the point where the stub occurs. A
5817 -- more permissible system might defer this analysis to the point
5818 -- of instantiation, but this seems to complicated for now.
5820 if not Instantiating
then
5822 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
5824 Unum
: Unit_Number_Type
;
5830 (Load_Name
=> Subunit_Name
,
5835 -- If the proper body is not found, a warning message will be
5836 -- emitted when analyzing the stub, or later at the point
5837 -- of instantiation. Here we just leave the stub as is.
5839 if Unum
= No_Unit
then
5840 Subunits_Missing
:= True;
5841 goto Subunit_Not_Found
;
5844 Subunit
:= Cunit
(Unum
);
5846 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
5848 ("found child unit instead of expected SEPARATE subunit",
5850 Error_Msg_Sloc
:= Sloc
(N
);
5851 Error_Msg_N
("\to complete stub #", Subunit
);
5852 goto Subunit_Not_Found
;
5855 -- We must create a generic copy of the subunit, in order to
5856 -- perform semantic analysis on it, and we must replace the
5857 -- stub in the original generic unit with the subunit, in order
5858 -- to preserve non-local references within.
5860 -- Only the proper body needs to be copied. Library_Unit and
5861 -- context clause are simply inherited by the generic copy.
5862 -- Note that the copy (which may be recursive if there are
5863 -- nested subunits) must be done first, before attaching it to
5864 -- the enclosing generic.
5868 (Proper_Body
(Unit
(Subunit
)),
5869 Empty
, Instantiating
=> False);
5871 -- Now place the original proper body in the original generic
5872 -- unit. This is a body, not a compilation unit.
5874 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
5875 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
5876 Set_Was_Originally_Stub
(N
);
5878 -- Finally replace the body of the subunit with its copy, and
5879 -- make this new subunit into the library unit of the generic
5880 -- copy, which does not have stubs any longer.
5882 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
5883 Set_Library_Unit
(New_N
, Subunit
);
5884 Inherit_Context
(Unit
(Subunit
), N
);
5887 -- If we are instantiating, this must be an error case, since
5888 -- otherwise we would have replaced the stub node by the proper body
5889 -- that corresponds. So just ignore it in the copy (i.e. we have
5890 -- copied it, and that is good enough).
5896 <<Subunit_Not_Found
>> null;
5898 -- If the node is a compilation unit, it is the subunit of a stub, which
5899 -- has been loaded already (see code below). In this case, the library
5900 -- unit field of N points to the parent unit (which is a compilation
5901 -- unit) and need not (and cannot!) be copied.
5903 -- When the proper body of the stub is analyzed, the library_unit link
5904 -- is used to establish the proper context (see sem_ch10).
5906 -- The other fields of a compilation unit are copied as usual
5908 elsif Nkind
(N
) = N_Compilation_Unit
then
5910 -- This code can only be executed when not instantiating, because in
5911 -- the copy made for an instantiation, the compilation unit node has
5912 -- disappeared at the point that a stub is replaced by its proper
5915 pragma Assert
(not Instantiating
);
5917 Set_Context_Items
(New_N
,
5918 Copy_Generic_List
(Context_Items
(N
), New_N
));
5921 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5923 Set_First_Inlined_Subprogram
(New_N
,
5925 (First_Inlined_Subprogram
(N
), New_N
, False));
5927 Set_Aux_Decls_Node
(New_N
,
5928 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5930 -- For an assignment node, the assignment is known to be semantically
5931 -- legal if we are instantiating the template. This avoids incorrect
5932 -- diagnostics in generated code.
5934 elsif Nkind
(N
) = N_Assignment_Statement
then
5936 -- Copy name and expression fields in usual manner
5939 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5941 Set_Expression
(New_N
,
5942 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5944 if Instantiating
then
5945 Set_Assignment_OK
(Name
(New_N
), True);
5948 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
5949 if not Instantiating
then
5950 Set_Associated_Node
(N
, New_N
);
5953 if Present
(Get_Associated_Node
(N
))
5954 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5956 -- In the generic the aggregate has some composite type. If at
5957 -- the point of instantiation the type has a private view,
5958 -- install the full view (and that of its ancestors, if any).
5961 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5966 and then Is_Private_Type
(T
)
5972 and then Is_Tagged_Type
(T
)
5973 and then Is_Derived_Type
(T
)
5975 Rt
:= Root_Type
(T
);
5980 if Is_Private_Type
(T
) then
5991 -- Do not copy the associated node, which points to
5992 -- the generic copy of the aggregate.
5995 use Atree
.Unchecked_Access
;
5996 -- This code section is part of the implementation of an untyped
5997 -- tree traversal, so it needs direct access to node fields.
6000 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6001 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6002 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6003 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6006 -- Allocators do not have an identifier denoting the access type,
6007 -- so we must locate it through the expression to check whether
6008 -- the views are consistent.
6010 elsif Nkind
(N
) = N_Allocator
6011 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
6012 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
6013 and then Instantiating
6016 T
: constant Node_Id
:=
6017 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
6023 -- Retrieve the allocator node in the generic copy
6025 Acc_T
:= Etype
(Parent
(Parent
(T
)));
6027 and then Is_Private_Type
(Acc_T
)
6029 Switch_View
(Acc_T
);
6036 -- For a proper body, we must catch the case of a proper body that
6037 -- replaces a stub. This represents the point at which a separate
6038 -- compilation unit, and hence template file, may be referenced, so we
6039 -- must make a new source instantiation entry for the template of the
6040 -- subunit, and ensure that all nodes in the subunit are adjusted using
6041 -- this new source instantiation entry.
6043 elsif Nkind
(N
) in N_Proper_Body
then
6045 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
6048 if Instantiating
and then Was_Originally_Stub
(N
) then
6049 Create_Instantiation_Source
6050 (Instantiation_Node
,
6051 Defining_Entity
(N
),
6056 -- Now copy the fields of the proper body, using the new
6057 -- adjustment factor if one was needed as per test above.
6061 -- Restore the original adjustment factor in case changed
6063 S_Adjustment
:= Save_Adjustment
;
6066 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6067 -- generic unit, not to the instantiating unit.
6069 elsif Nkind
(N
) = N_Pragma
6070 and then Instantiating
6073 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
6075 if Prag_Id
= Pragma_Ident
6076 or else Prag_Id
= Pragma_Comment
6078 New_N
:= Make_Null_Statement
(Sloc
(N
));
6084 elsif Nkind_In
(N
, N_Integer_Literal
,
6088 -- No descendant fields need traversing
6092 -- For the remaining nodes, copy recursively their descendants
6098 and then Nkind
(N
) = N_Subprogram_Body
6100 Set_Generic_Parent
(Specification
(New_N
), N
);
6105 end Copy_Generic_Node
;
6107 ----------------------------
6108 -- Denotes_Formal_Package --
6109 ----------------------------
6111 function Denotes_Formal_Package
6113 On_Exit
: Boolean := False) return Boolean
6116 Scop
: constant Entity_Id
:= Scope
(Pack
);
6123 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
6125 Par
:= Current_Instantiated_Parent
.Act_Id
;
6128 if Ekind
(Scop
) = E_Generic_Package
6129 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
6130 N_Generic_Subprogram_Declaration
6134 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
6135 N_Formal_Package_Declaration
6143 -- Check whether this package is associated with a formal package of
6144 -- the enclosing instantiation. Iterate over the list of renamings.
6146 E
:= First_Entity
(Par
);
6147 while Present
(E
) loop
6148 if Ekind
(E
) /= E_Package
6149 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
6153 elsif Renamed_Object
(E
) = Par
then
6156 elsif Renamed_Object
(E
) = Pack
then
6165 end Denotes_Formal_Package
;
6171 procedure End_Generic
is
6173 -- ??? More things could be factored out in this routine. Should
6174 -- probably be done at a later stage.
6176 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
6177 Generic_Flags
.Decrement_Last
;
6179 Expander_Mode_Restore
;
6182 ----------------------
6183 -- Find_Actual_Type --
6184 ----------------------
6186 function Find_Actual_Type
6188 Gen_Type
: Entity_Id
) return Entity_Id
6190 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
6194 -- Special processing only applies to child units
6196 if not Is_Child_Unit
(Gen_Scope
) then
6197 return Get_Instance_Of
(Typ
);
6199 -- If designated or component type is itself a formal of the child unit,
6200 -- its instance is available.
6202 elsif Scope
(Typ
) = Gen_Scope
then
6203 return Get_Instance_Of
(Typ
);
6205 -- If the array or access type is not declared in the parent unit,
6206 -- no special processing needed.
6208 elsif not Is_Generic_Type
(Typ
)
6209 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
6211 return Get_Instance_Of
(Typ
);
6213 -- Otherwise, retrieve designated or component type by visibility
6216 T
:= Current_Entity
(Typ
);
6217 while Present
(T
) loop
6218 if In_Open_Scopes
(Scope
(T
)) then
6221 elsif Is_Generic_Actual_Type
(T
) then
6230 end Find_Actual_Type
;
6232 ----------------------------
6233 -- Freeze_Subprogram_Body --
6234 ----------------------------
6236 procedure Freeze_Subprogram_Body
6237 (Inst_Node
: Node_Id
;
6239 Pack_Id
: Entity_Id
)
6242 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
6243 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
6248 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
6249 -- Yields True if N1 and N2 appear in the same compilation unit,
6250 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6251 -- traversal of the tree for the unit.
6253 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
6254 -- Find innermost package body that encloses the given node, and which
6255 -- is not a compilation unit. Freeze nodes for the instance, or for its
6256 -- enclosing body, may be inserted after the enclosing_body of the
6259 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
6260 -- Find entity for given package body, and locate or create a freeze
6263 function True_Parent
(N
: Node_Id
) return Node_Id
;
6264 -- For a subunit, return parent of corresponding stub
6270 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
6276 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
6277 -- Find distance from given node to enclosing compilation unit
6283 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
6286 and then Nkind
(P
) /= N_Compilation_Unit
6288 P
:= True_Parent
(P
);
6293 -- Start of processing for Earlier
6296 Find_Depth
(P1
, D1
);
6297 Find_Depth
(P2
, D2
);
6307 P1
:= True_Parent
(P1
);
6312 P2
:= True_Parent
(P2
);
6316 -- At this point P1 and P2 are at the same distance from the root.
6317 -- We examine their parents until we find a common declarative
6318 -- list, at which point we can establish their relative placement
6319 -- by comparing their ultimate slocs. If we reach the root,
6320 -- N1 and N2 do not descend from the same declarative list (e.g.
6321 -- one is nested in the declarative part and the other is in a block
6322 -- in the statement part) and the earlier one is already frozen.
6324 while not Is_List_Member
(P1
)
6325 or else not Is_List_Member
(P2
)
6326 or else List_Containing
(P1
) /= List_Containing
(P2
)
6328 P1
:= True_Parent
(P1
);
6329 P2
:= True_Parent
(P2
);
6331 if Nkind
(Parent
(P1
)) = N_Subunit
then
6332 P1
:= Corresponding_Stub
(Parent
(P1
));
6335 if Nkind
(Parent
(P2
)) = N_Subunit
then
6336 P2
:= Corresponding_Stub
(Parent
(P2
));
6345 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
6348 --------------------
6349 -- Enclosing_Body --
6350 --------------------
6352 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
6353 P
: Node_Id
:= Parent
(N
);
6357 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
6359 if Nkind
(P
) = N_Package_Body
then
6361 if Nkind
(Parent
(P
)) = N_Subunit
then
6362 return Corresponding_Stub
(Parent
(P
));
6368 P
:= True_Parent
(P
);
6374 -------------------------
6375 -- Package_Freeze_Node --
6376 -------------------------
6378 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
6382 if Nkind
(B
) = N_Package_Body
then
6383 Id
:= Corresponding_Spec
(B
);
6385 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
6386 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
6389 Ensure_Freeze_Node
(Id
);
6390 return Freeze_Node
(Id
);
6391 end Package_Freeze_Node
;
6397 function True_Parent
(N
: Node_Id
) return Node_Id
is
6399 if Nkind
(Parent
(N
)) = N_Subunit
then
6400 return Parent
(Corresponding_Stub
(Parent
(N
)));
6406 -- Start of processing of Freeze_Subprogram_Body
6409 -- If the instance and the generic body appear within the same unit, and
6410 -- the instance precedes the generic, the freeze node for the instance
6411 -- must appear after that of the generic. If the generic is nested
6412 -- within another instance I2, then current instance must be frozen
6413 -- after I2. In both cases, the freeze nodes are those of enclosing
6414 -- packages. Otherwise, the freeze node is placed at the end of the
6415 -- current declarative part.
6417 Enc_G
:= Enclosing_Body
(Gen_Body
);
6418 Enc_I
:= Enclosing_Body
(Inst_Node
);
6419 Ensure_Freeze_Node
(Pack_Id
);
6420 F_Node
:= Freeze_Node
(Pack_Id
);
6422 if Is_Generic_Instance
(Par
)
6423 and then Present
(Freeze_Node
(Par
))
6425 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
6427 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
6429 -- The parent was a premature instantiation. Insert freeze node at
6430 -- the end the current declarative part.
6432 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6435 Insert_After
(Freeze_Node
(Par
), F_Node
);
6438 -- The body enclosing the instance should be frozen after the body that
6439 -- includes the generic, because the body of the instance may make
6440 -- references to entities therein. If the two are not in the same
6441 -- declarative part, or if the one enclosing the instance is frozen
6442 -- already, freeze the instance at the end of the current declarative
6445 elsif Is_Generic_Instance
(Par
)
6446 and then Present
(Freeze_Node
(Par
))
6447 and then Present
(Enc_I
)
6449 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
6451 (Nkind
(Enc_I
) = N_Package_Body
6453 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
6455 -- The enclosing package may contain several instances. Rather
6456 -- than computing the earliest point at which to insert its
6457 -- freeze node, we place it at the end of the declarative part
6458 -- of the parent of the generic.
6460 Insert_After_Last_Decl
6461 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
6464 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6466 elsif Present
(Enc_G
)
6467 and then Present
(Enc_I
)
6468 and then Enc_G
/= Enc_I
6469 and then Earlier
(Inst_Node
, Gen_Body
)
6471 if Nkind
(Enc_G
) = N_Package_Body
then
6472 E_G_Id
:= Corresponding_Spec
(Enc_G
);
6473 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
6475 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
6478 -- Freeze package that encloses instance, and place node after
6479 -- package that encloses generic. If enclosing package is already
6480 -- frozen we have to assume it is at the proper place. This may be
6481 -- a potential ABE that requires dynamic checking. Do not add a
6482 -- freeze node if the package that encloses the generic is inside
6483 -- the body that encloses the instance, because the freeze node
6484 -- would be in the wrong scope. Additional contortions needed if
6485 -- the bodies are within a subunit.
6488 Enclosing_Body
: Node_Id
;
6491 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
6492 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
6494 Enclosing_Body
:= Enc_I
;
6497 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
6498 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
6502 -- Freeze enclosing subunit before instance
6504 Ensure_Freeze_Node
(E_G_Id
);
6506 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
6507 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
6510 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6513 -- If none of the above, insert freeze node at the end of the current
6514 -- declarative part.
6516 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6518 end Freeze_Subprogram_Body
;
6524 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
6526 return Generic_Renamings
.Table
(E
).Gen_Id
;
6529 ---------------------
6530 -- Get_Instance_Of --
6531 ---------------------
6533 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
6534 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
6537 if Res
/= Assoc_Null
then
6538 return Generic_Renamings
.Table
(Res
).Act_Id
;
6540 -- On exit, entity is not instantiated: not a generic parameter, or
6541 -- else parameter of an inner generic unit.
6545 end Get_Instance_Of
;
6547 ------------------------------------
6548 -- Get_Package_Instantiation_Node --
6549 ------------------------------------
6551 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
6552 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
6556 -- If the Package_Instantiation attribute has been set on the package
6557 -- entity, then use it directly when it (or its Original_Node) refers
6558 -- to an N_Package_Instantiation node. In principle it should be
6559 -- possible to have this field set in all cases, which should be
6560 -- investigated, and would allow this function to be significantly
6563 if Present
(Package_Instantiation
(A
)) then
6564 if Nkind
(Package_Instantiation
(A
)) = N_Package_Instantiation
then
6565 return Package_Instantiation
(A
);
6567 elsif Nkind
(Original_Node
(Package_Instantiation
(A
))) =
6568 N_Package_Instantiation
6570 return Original_Node
(Package_Instantiation
(A
));
6574 -- If the instantiation is a compilation unit that does not need body
6575 -- then the instantiation node has been rewritten as a package
6576 -- declaration for the instance, and we return the original node.
6578 -- If it is a compilation unit and the instance node has not been
6579 -- rewritten, then it is still the unit of the compilation. Finally, if
6580 -- a body is present, this is a parent of the main unit whose body has
6581 -- been compiled for inlining purposes, and the instantiation node has
6582 -- been rewritten with the instance body.
6584 -- Otherwise the instantiation node appears after the declaration. If
6585 -- the entity is a formal package, the declaration may have been
6586 -- rewritten as a generic declaration (in the case of a formal with box)
6587 -- or left as a formal package declaration if it has actuals, and is
6588 -- found with a forward search.
6590 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
6591 if Nkind
(Decl
) = N_Package_Declaration
6592 and then Present
(Corresponding_Body
(Decl
))
6594 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
6597 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
6598 return Original_Node
(Decl
);
6600 return Unit
(Parent
(Decl
));
6603 elsif Nkind
(Decl
) = N_Package_Declaration
6604 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
6606 return Original_Node
(Decl
);
6609 Inst
:= Next
(Decl
);
6610 while not Nkind_In
(Inst
, N_Package_Instantiation
,
6611 N_Formal_Package_Declaration
)
6618 end Get_Package_Instantiation_Node
;
6620 ------------------------
6621 -- Has_Been_Exchanged --
6622 ------------------------
6624 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
6628 Next
:= First_Elmt
(Exchanged_Views
);
6629 while Present
(Next
) loop
6630 if Full_View
(Node
(Next
)) = E
then
6638 end Has_Been_Exchanged
;
6644 function Hash
(F
: Entity_Id
) return HTable_Range
is
6646 return HTable_Range
(F
mod HTable_Size
);
6649 ------------------------
6650 -- Hide_Current_Scope --
6651 ------------------------
6653 procedure Hide_Current_Scope
is
6654 C
: constant Entity_Id
:= Current_Scope
;
6658 Set_Is_Hidden_Open_Scope
(C
);
6660 E
:= First_Entity
(C
);
6661 while Present
(E
) loop
6662 if Is_Immediately_Visible
(E
) then
6663 Set_Is_Immediately_Visible
(E
, False);
6664 Append_Elmt
(E
, Hidden_Entities
);
6670 -- Make the scope name invisible as well. This is necessary, but might
6671 -- conflict with calls to Rtsfind later on, in case the scope is a
6672 -- predefined one. There is no clean solution to this problem, so for
6673 -- now we depend on the user not redefining Standard itself in one of
6674 -- the parent units.
6676 if Is_Immediately_Visible
(C
)
6677 and then C
/= Standard_Standard
6679 Set_Is_Immediately_Visible
(C
, False);
6680 Append_Elmt
(C
, Hidden_Entities
);
6683 end Hide_Current_Scope
;
6689 procedure Init_Env
is
6690 Saved
: Instance_Env
;
6693 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
6694 Saved
.Exchanged_Views
:= Exchanged_Views
;
6695 Saved
.Hidden_Entities
:= Hidden_Entities
;
6696 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
6697 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
6698 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
6700 -- Save configuration switches. These may be reset if the unit is a
6701 -- predefined unit, and the current mode is not Ada 2005.
6703 Save_Opt_Config_Switches
(Saved
.Switches
);
6705 Instance_Envs
.Append
(Saved
);
6707 Exchanged_Views
:= New_Elmt_List
;
6708 Hidden_Entities
:= New_Elmt_List
;
6710 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6711 -- this is set properly in Set_Instance_Env.
6713 Current_Instantiated_Parent
:=
6714 (Current_Scope
, Current_Scope
, Assoc_Null
);
6717 ------------------------------
6718 -- In_Same_Declarative_Part --
6719 ------------------------------
6721 function In_Same_Declarative_Part
6723 Inst
: Node_Id
) return Boolean
6725 Decls
: constant Node_Id
:= Parent
(F_Node
);
6726 Nod
: Node_Id
:= Parent
(Inst
);
6729 while Present
(Nod
) loop
6733 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
6741 elsif Nkind
(Nod
) = N_Subunit
then
6742 Nod
:= Corresponding_Stub
(Nod
);
6744 elsif Nkind
(Nod
) = N_Compilation_Unit
then
6748 Nod
:= Parent
(Nod
);
6753 end In_Same_Declarative_Part
;
6755 ---------------------
6756 -- In_Main_Context --
6757 ---------------------
6759 function In_Main_Context
(E
: Entity_Id
) return Boolean is
6765 if not Is_Compilation_Unit
(E
)
6766 or else Ekind
(E
) /= E_Package
6767 or else In_Private_Part
(E
)
6772 Context
:= Context_Items
(Cunit
(Main_Unit
));
6774 Clause
:= First
(Context
);
6775 while Present
(Clause
) loop
6776 if Nkind
(Clause
) = N_With_Clause
then
6777 Nam
:= Name
(Clause
);
6779 -- If the current scope is part of the context of the main unit,
6780 -- analysis of the corresponding with_clause is not complete, and
6781 -- the entity is not set. We use the Chars field directly, which
6782 -- might produce false positives in rare cases, but guarantees
6783 -- that we produce all the instance bodies we will need.
6785 if (Is_Entity_Name
(Nam
)
6786 and then Chars
(Nam
) = Chars
(E
))
6787 or else (Nkind
(Nam
) = N_Selected_Component
6788 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
6798 end In_Main_Context
;
6800 ---------------------
6801 -- Inherit_Context --
6802 ---------------------
6804 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
6805 Current_Context
: List_Id
;
6806 Current_Unit
: Node_Id
;
6811 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
6813 -- The inherited context is attached to the enclosing compilation
6814 -- unit. This is either the main unit, or the declaration for the
6815 -- main unit (in case the instantiation appears within the package
6816 -- declaration and the main unit is its body).
6818 Current_Unit
:= Parent
(Inst
);
6819 while Present
(Current_Unit
)
6820 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
6822 Current_Unit
:= Parent
(Current_Unit
);
6825 Current_Context
:= Context_Items
(Current_Unit
);
6827 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
6828 while Present
(Item
) loop
6829 if Nkind
(Item
) = N_With_Clause
then
6830 New_I
:= New_Copy
(Item
);
6831 Set_Implicit_With
(New_I
, True);
6832 Append
(New_I
, Current_Context
);
6838 end Inherit_Context
;
6844 procedure Initialize
is
6846 Generic_Renamings
.Init
;
6849 Generic_Renamings_HTable
.Reset
;
6850 Circularity_Detected
:= False;
6851 Exchanged_Views
:= No_Elist
;
6852 Hidden_Entities
:= No_Elist
;
6855 ----------------------------
6856 -- Insert_After_Last_Decl --
6857 ----------------------------
6859 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
6860 L
: List_Id
:= List_Containing
(N
);
6861 P
: constant Node_Id
:= Parent
(L
);
6864 if not Is_List_Member
(F_Node
) then
6865 if Nkind
(P
) = N_Package_Specification
6866 and then L
= Visible_Declarations
(P
)
6867 and then Present
(Private_Declarations
(P
))
6868 and then not Is_Empty_List
(Private_Declarations
(P
))
6870 L
:= Private_Declarations
(P
);
6873 Insert_After
(Last
(L
), F_Node
);
6875 end Insert_After_Last_Decl
;
6881 procedure Install_Body
6882 (Act_Body
: Node_Id
;
6887 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
6888 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
6889 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
6890 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
6891 Gen_Unit
: constant Node_Id
:=
6892 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
6893 Orig_Body
: Node_Id
:= Gen_Body
;
6895 Body_Unit
: Node_Id
;
6897 Must_Delay
: Boolean;
6899 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
6900 -- Find subprogram (if any) that encloses instance and/or generic body
6902 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
6903 -- If the instance is nested inside a generic unit, the Sloc of the
6904 -- instance indicates the place of the original definition, not the
6905 -- point of the current enclosing instance. Pending a better usage of
6906 -- Slocs to indicate instantiation places, we determine the place of
6907 -- origin of a node by finding the maximum sloc of any ancestor node.
6908 -- Why is this not equivalent to Top_Level_Location ???
6910 --------------------
6911 -- Enclosing_Subp --
6912 --------------------
6914 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
6915 Scop
: Entity_Id
:= Scope
(Id
);
6918 while Scop
/= Standard_Standard
6919 and then not Is_Overloadable
(Scop
)
6921 Scop
:= Scope
(Scop
);
6931 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
6938 while Present
(N1
) and then N1
/= Act_Unit
loop
6939 if Sloc
(N1
) > Res
then
6949 -- Start of processing for Install_Body
6953 -- If the body is a subunit, the freeze point is the corresponding
6954 -- stub in the current compilation, not the subunit itself.
6956 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
6957 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6959 Orig_Body
:= Gen_Body
;
6962 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6964 -- If the instantiation and the generic definition appear in the same
6965 -- package declaration, this is an early instantiation. If they appear
6966 -- in the same declarative part, it is an early instantiation only if
6967 -- the generic body appears textually later, and the generic body is
6968 -- also in the main unit.
6970 -- If instance is nested within a subprogram, and the generic body is
6971 -- not, the instance is delayed because the enclosing body is. If
6972 -- instance and body are within the same scope, or the same sub-
6973 -- program body, indicate explicitly that the instance is delayed.
6976 (Gen_Unit
= Act_Unit
6977 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
6978 N_Generic_Package_Declaration
)
6979 or else (Gen_Unit
= Body_Unit
6980 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6981 and then Is_In_Main_Unit
(Gen_Unit
)
6982 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6984 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6986 -- If this is an early instantiation, the freeze node is placed after
6987 -- the generic body. Otherwise, if the generic appears in an instance,
6988 -- we cannot freeze the current instance until the outer one is frozen.
6989 -- This is only relevant if the current instance is nested within some
6990 -- inner scope not itself within the outer instance. If this scope is
6991 -- a package body in the same declarative part as the outer instance,
6992 -- then that body needs to be frozen after the outer instance. Finally,
6993 -- if no delay is needed, we place the freeze node at the end of the
6994 -- current declarative part.
6996 if Expander_Active
then
6997 Ensure_Freeze_Node
(Act_Id
);
6998 F_Node
:= Freeze_Node
(Act_Id
);
7001 Insert_After
(Orig_Body
, F_Node
);
7003 elsif Is_Generic_Instance
(Par
)
7004 and then Present
(Freeze_Node
(Par
))
7005 and then Scope
(Act_Id
) /= Par
7007 -- Freeze instance of inner generic after instance of enclosing
7010 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
7011 Insert_After
(Freeze_Node
(Par
), F_Node
);
7013 -- Freeze package enclosing instance of inner generic after
7014 -- instance of enclosing generic.
7016 elsif Nkind
(Parent
(N
)) = N_Package_Body
7017 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
7021 Enclosing
: constant Entity_Id
:=
7022 Corresponding_Spec
(Parent
(N
));
7025 Insert_After_Last_Decl
(N
, F_Node
);
7026 Ensure_Freeze_Node
(Enclosing
);
7028 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
7029 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
7034 Insert_After_Last_Decl
(N
, F_Node
);
7038 Insert_After_Last_Decl
(N
, F_Node
);
7042 Set_Is_Frozen
(Act_Id
);
7043 Insert_Before
(N
, Act_Body
);
7044 Mark_Rewrite_Insertion
(Act_Body
);
7047 -----------------------------
7048 -- Install_Formal_Packages --
7049 -----------------------------
7051 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
7055 E
:= First_Entity
(Par
);
7056 while Present
(E
) loop
7057 if Ekind
(E
) = E_Package
7058 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
7060 -- If this is the renaming for the parent instance, done
7062 if Renamed_Object
(E
) = Par
then
7065 -- The visibility of a formal of an enclosing generic is
7068 elsif Denotes_Formal_Package
(E
) then
7071 elsif Present
(Associated_Formal_Package
(E
))
7072 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
7074 Check_Generic_Actuals
(Renamed_Object
(E
), True);
7075 Set_Is_Hidden
(E
, False);
7081 end Install_Formal_Packages
;
7083 --------------------
7084 -- Install_Parent --
7085 --------------------
7087 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
7088 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
7089 S
: constant Entity_Id
:= Current_Scope
;
7090 Inst_Par
: Entity_Id
;
7091 First_Par
: Entity_Id
;
7092 Inst_Node
: Node_Id
;
7093 Gen_Par
: Entity_Id
;
7094 First_Gen
: Entity_Id
;
7097 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
7098 -- Install the scopes of noninstance parent units ending with Par
7100 procedure Install_Spec
(Par
: Entity_Id
);
7101 -- The child unit is within the declarative part of the parent, so
7102 -- the declarations within the parent are immediately visible.
7104 -------------------------------
7105 -- Install_Noninstance_Specs --
7106 -------------------------------
7108 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
7111 and then Par
/= Standard_Standard
7112 and then not In_Open_Scopes
(Par
)
7114 Install_Noninstance_Specs
(Scope
(Par
));
7117 end Install_Noninstance_Specs
;
7123 procedure Install_Spec
(Par
: Entity_Id
) is
7124 Spec
: constant Node_Id
:=
7125 Specification
(Unit_Declaration_Node
(Par
));
7128 -- If this parent of the child instance is a top-level unit,
7129 -- then record the unit and its visibility for later resetting
7130 -- in Remove_Parent. We exclude units that are generic instances,
7131 -- as we only want to record this information for the ultimate
7132 -- top-level noninstance parent (is that always correct???).
7134 if Scope
(Par
) = Standard_Standard
7135 and then not Is_Generic_Instance
(Par
)
7137 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
7138 Instance_Parent_Unit
:= Par
;
7141 -- Open the parent scope and make it and its declarations visible.
7142 -- If this point is not within a body, then only the visible
7143 -- declarations should be made visible, and installation of the
7144 -- private declarations is deferred until the appropriate point
7145 -- within analysis of the spec being instantiated (see the handling
7146 -- of parent visibility in Analyze_Package_Specification). This is
7147 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7148 -- private view problems that occur when compiling instantiations of
7149 -- a generic child of that package (Generic_Dispatching_Constructor).
7150 -- If the instance freezes a tagged type, inlinings of operations
7151 -- from Ada.Tags may need the full view of type Tag. If inlining took
7152 -- proper account of establishing visibility of inlined subprograms'
7153 -- parents then it should be possible to remove this
7154 -- special check. ???
7157 Set_Is_Immediately_Visible
(Par
);
7158 Install_Visible_Declarations
(Par
);
7159 Set_Use
(Visible_Declarations
(Spec
));
7161 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
7162 Install_Private_Declarations
(Par
);
7163 Set_Use
(Private_Declarations
(Spec
));
7167 -- Start of processing for Install_Parent
7170 -- We need to install the parent instance to compile the instantiation
7171 -- of the child, but the child instance must appear in the current
7172 -- scope. Given that we cannot place the parent above the current scope
7173 -- in the scope stack, we duplicate the current scope and unstack both
7174 -- after the instantiation is complete.
7176 -- If the parent is itself the instantiation of a child unit, we must
7177 -- also stack the instantiation of its parent, and so on. Each such
7178 -- ancestor is the prefix of the name in a prior instantiation.
7180 -- If this is a nested instance, the parent unit itself resolves to
7181 -- a renaming of the parent instance, whose declaration we need.
7183 -- Finally, the parent may be a generic (not an instance) when the
7184 -- child unit appears as a formal package.
7188 if Present
(Renamed_Entity
(Inst_Par
)) then
7189 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7192 First_Par
:= Inst_Par
;
7195 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
7197 First_Gen
:= Gen_Par
;
7199 while Present
(Gen_Par
)
7200 and then Is_Child_Unit
(Gen_Par
)
7202 -- Load grandparent instance as well
7204 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
7206 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
7207 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
7209 if Present
(Renamed_Entity
(Inst_Par
)) then
7210 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7215 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
7217 if Present
(Gen_Par
) then
7218 Prepend_Elmt
(Inst_Par
, Ancestors
);
7221 -- Parent is not the name of an instantiation
7223 Install_Noninstance_Specs
(Inst_Par
);
7235 if Present
(First_Gen
) then
7236 Append_Elmt
(First_Par
, Ancestors
);
7239 Install_Noninstance_Specs
(First_Par
);
7242 if not Is_Empty_Elmt_List
(Ancestors
) then
7243 Elmt
:= First_Elmt
(Ancestors
);
7245 while Present
(Elmt
) loop
7246 Install_Spec
(Node
(Elmt
));
7247 Install_Formal_Packages
(Node
(Elmt
));
7258 --------------------------------
7259 -- Instantiate_Formal_Package --
7260 --------------------------------
7262 function Instantiate_Formal_Package
7265 Analyzed_Formal
: Node_Id
) return List_Id
7267 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7268 Actual_Pack
: Entity_Id
;
7269 Formal_Pack
: Entity_Id
;
7270 Gen_Parent
: Entity_Id
;
7273 Parent_Spec
: Node_Id
;
7275 procedure Find_Matching_Actual
7277 Act
: in out Entity_Id
);
7278 -- We need to associate each formal entity in the formal package
7279 -- with the corresponding entity in the actual package. The actual
7280 -- package has been analyzed and possibly expanded, and as a result
7281 -- there is no one-to-one correspondence between the two lists (for
7282 -- example, the actual may include subtypes, itypes, and inherited
7283 -- primitive operations, interspersed among the renaming declarations
7284 -- for the actuals) . We retrieve the corresponding actual by name
7285 -- because each actual has the same name as the formal, and they do
7286 -- appear in the same order.
7288 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
7289 -- Retrieve entity of defining entity of generic formal parameter.
7290 -- Only the declarations of formals need to be considered when
7291 -- linking them to actuals, but the declarative list may include
7292 -- internal entities generated during analysis, and those are ignored.
7294 procedure Match_Formal_Entity
7295 (Formal_Node
: Node_Id
;
7296 Formal_Ent
: Entity_Id
;
7297 Actual_Ent
: Entity_Id
);
7298 -- Associates the formal entity with the actual. In the case
7299 -- where Formal_Ent is a formal package, this procedure iterates
7300 -- through all of its formals and enters associations between the
7301 -- actuals occurring in the formal package's corresponding actual
7302 -- package (given by Actual_Ent) and the formal package's formal
7303 -- parameters. This procedure recurses if any of the parameters is
7304 -- itself a package.
7306 function Is_Instance_Of
7307 (Act_Spec
: Entity_Id
;
7308 Gen_Anc
: Entity_Id
) return Boolean;
7309 -- The actual can be an instantiation of a generic within another
7310 -- instance, in which case there is no direct link from it to the
7311 -- original generic ancestor. In that case, we recognize that the
7312 -- ultimate ancestor is the same by examining names and scopes.
7314 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
7315 -- Within the generic part, entities in the formal package are
7316 -- visible. To validate subsequent type declarations, indicate
7317 -- the correspondence between the entities in the analyzed formal,
7318 -- and the entities in the actual package. There are three packages
7319 -- involved in the instantiation of a formal package: the parent
7320 -- generic P1 which appears in the generic declaration, the fake
7321 -- instantiation P2 which appears in the analyzed generic, and whose
7322 -- visible entities may be used in subsequent formals, and the actual
7323 -- P3 in the instance. To validate subsequent formals, me indicate
7324 -- that the entities in P2 are mapped into those of P3. The mapping of
7325 -- entities has to be done recursively for nested packages.
7327 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
7328 -- If the current formal is declared with a box, its own formals are
7329 -- visible in the instance, as they were in the generic, and their
7330 -- Hidden flag must be reset. If some of these formals are themselves
7331 -- packages declared with a box, the processing must be recursive.
7333 --------------------------
7334 -- Find_Matching_Actual --
7335 --------------------------
7337 procedure Find_Matching_Actual
7339 Act
: in out Entity_Id
)
7341 Formal_Ent
: Entity_Id
;
7344 case Nkind
(Original_Node
(F
)) is
7345 when N_Formal_Object_Declaration |
7346 N_Formal_Type_Declaration
=>
7347 Formal_Ent
:= Defining_Identifier
(F
);
7349 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7353 when N_Formal_Subprogram_Declaration |
7354 N_Formal_Package_Declaration |
7355 N_Package_Declaration |
7356 N_Generic_Package_Declaration
=>
7357 Formal_Ent
:= Defining_Entity
(F
);
7359 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7364 raise Program_Error
;
7366 end Find_Matching_Actual
;
7368 -------------------------
7369 -- Match_Formal_Entity --
7370 -------------------------
7372 procedure Match_Formal_Entity
7373 (Formal_Node
: Node_Id
;
7374 Formal_Ent
: Entity_Id
;
7375 Actual_Ent
: Entity_Id
)
7377 Act_Pkg
: Entity_Id
;
7380 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
7382 if Ekind
(Actual_Ent
) = E_Package
then
7384 -- Record associations for each parameter
7386 Act_Pkg
:= Actual_Ent
;
7389 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
7398 -- Retrieve the actual given in the formal package declaration
7400 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
7402 -- The actual in the formal package declaration may be a
7403 -- renamed generic package, in which case we want to retrieve
7404 -- the original generic in order to traverse its formal part.
7406 if Present
(Renamed_Entity
(Actual
)) then
7407 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
7409 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
7412 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
7414 if Present
(Formals
) then
7415 F_Node
:= First_Non_Pragma
(Formals
);
7420 while Present
(A_Ent
)
7421 and then Present
(F_Node
)
7422 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
7424 F_Ent
:= Get_Formal_Entity
(F_Node
);
7426 if Present
(F_Ent
) then
7428 -- This is a formal of the original package. Record
7429 -- association and recurse.
7431 Find_Matching_Actual
(F_Node
, A_Ent
);
7432 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
7433 Next_Entity
(A_Ent
);
7436 Next_Non_Pragma
(F_Node
);
7440 end Match_Formal_Entity
;
7442 -----------------------
7443 -- Get_Formal_Entity --
7444 -----------------------
7446 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
7447 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
7450 when N_Formal_Object_Declaration
=>
7451 return Defining_Identifier
(N
);
7453 when N_Formal_Type_Declaration
=>
7454 return Defining_Identifier
(N
);
7456 when N_Formal_Subprogram_Declaration
=>
7457 return Defining_Unit_Name
(Specification
(N
));
7459 when N_Formal_Package_Declaration
=>
7460 return Defining_Identifier
(Original_Node
(N
));
7462 when N_Generic_Package_Declaration
=>
7463 return Defining_Identifier
(Original_Node
(N
));
7465 -- All other declarations are introduced by semantic analysis and
7466 -- have no match in the actual.
7471 end Get_Formal_Entity
;
7473 --------------------
7474 -- Is_Instance_Of --
7475 --------------------
7477 function Is_Instance_Of
7478 (Act_Spec
: Entity_Id
;
7479 Gen_Anc
: Entity_Id
) return Boolean
7481 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
7484 if No
(Gen_Par
) then
7487 -- Simplest case: the generic parent of the actual is the formal
7489 elsif Gen_Par
= Gen_Anc
then
7492 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
7495 -- The actual may be obtained through several instantiations. Its
7496 -- scope must itself be an instance of a generic declared in the
7497 -- same scope as the formal. Any other case is detected above.
7499 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
7503 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
7511 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
7516 Set_Instance_Of
(Form
, Act
);
7518 -- Traverse formal and actual package to map the corresponding
7519 -- entities. We skip over internal entities that may be generated
7520 -- during semantic analysis, and find the matching entities by
7521 -- name, given that they must appear in the same order.
7523 E1
:= First_Entity
(Form
);
7524 E2
:= First_Entity
(Act
);
7526 and then E1
/= First_Private_Entity
(Form
)
7528 -- Could this test be a single condition???
7529 -- Seems like it could, and isn't FPE (Form) a constant anyway???
7531 if not Is_Internal
(E1
)
7532 and then Present
(Parent
(E1
))
7533 and then not Is_Class_Wide_Type
(E1
)
7534 and then not Is_Internal_Name
(Chars
(E1
))
7537 and then Chars
(E2
) /= Chars
(E1
)
7545 Set_Instance_Of
(E1
, E2
);
7548 and then Is_Tagged_Type
(E2
)
7551 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
7554 if Ekind
(E1
) = E_Package
7555 and then No
(Renamed_Object
(E1
))
7557 Map_Entities
(E1
, E2
);
7566 ---------------------------
7567 -- Process_Nested_Formal --
7568 ---------------------------
7570 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
7574 if Present
(Associated_Formal_Package
(Formal
))
7575 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
7577 Ent
:= First_Entity
(Formal
);
7578 while Present
(Ent
) loop
7579 Set_Is_Hidden
(Ent
, False);
7580 Set_Is_Visible_Formal
(Ent
);
7581 Set_Is_Potentially_Use_Visible
7582 (Ent
, Is_Potentially_Use_Visible
(Formal
));
7584 if Ekind
(Ent
) = E_Package
then
7585 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
7586 Process_Nested_Formal
(Ent
);
7592 end Process_Nested_Formal
;
7594 -- Start of processing for Instantiate_Formal_Package
7599 if not Is_Entity_Name
(Actual
)
7600 or else Ekind
(Entity
(Actual
)) /= E_Package
7603 ("expect package instance to instantiate formal", Actual
);
7604 Abandon_Instantiation
(Actual
);
7605 raise Program_Error
;
7608 Actual_Pack
:= Entity
(Actual
);
7609 Set_Is_Instantiated
(Actual_Pack
);
7611 -- The actual may be a renamed package, or an outer generic formal
7612 -- package whose instantiation is converted into a renaming.
7614 if Present
(Renamed_Object
(Actual_Pack
)) then
7615 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
7618 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
7619 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
7620 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
7623 Generic_Parent
(Specification
(Analyzed_Formal
));
7625 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7628 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
7629 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
7631 Parent_Spec
:= Parent
(Actual_Pack
);
7634 if Gen_Parent
= Any_Id
then
7636 ("previous error in declaration of formal package", Actual
);
7637 Abandon_Instantiation
(Actual
);
7640 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
7646 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
7647 Abandon_Instantiation
(Actual
);
7650 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
7651 Map_Entities
(Formal_Pack
, Actual_Pack
);
7654 Make_Package_Renaming_Declaration
(Loc
,
7655 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
7656 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
7658 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
7659 Defining_Identifier
(Formal
));
7660 Decls
:= New_List
(Nod
);
7662 -- If the formal F has a box, then the generic declarations are
7663 -- visible in the generic G. In an instance of G, the corresponding
7664 -- entities in the actual for F (which are the actuals for the
7665 -- instantiation of the generic that F denotes) must also be made
7666 -- visible for analysis of the current instance. On exit from the
7667 -- current instance, those entities are made private again. If the
7668 -- actual is currently in use, these entities are also use-visible.
7670 -- The loop through the actual entities also steps through the formal
7671 -- entities and enters associations from formals to actuals into the
7672 -- renaming map. This is necessary to properly handle checking of
7673 -- actual parameter associations for later formals that depend on
7674 -- actuals declared in the formal package.
7676 -- In Ada 2005, partial parametrization requires that we make visible
7677 -- the actuals corresponding to formals that were defaulted in the
7678 -- formal package. There formals are identified because they remain
7679 -- formal generics within the formal package, rather than being
7680 -- renamings of the actuals supplied.
7683 Gen_Decl
: constant Node_Id
:=
7684 Unit_Declaration_Node
(Gen_Parent
);
7685 Formals
: constant List_Id
:=
7686 Generic_Formal_Declarations
(Gen_Decl
);
7688 Actual_Ent
: Entity_Id
;
7689 Actual_Of_Formal
: Node_Id
;
7690 Formal_Node
: Node_Id
;
7691 Formal_Ent
: Entity_Id
;
7694 if Present
(Formals
) then
7695 Formal_Node
:= First_Non_Pragma
(Formals
);
7697 Formal_Node
:= Empty
;
7700 Actual_Ent
:= First_Entity
(Actual_Pack
);
7702 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
7703 while Present
(Actual_Ent
)
7704 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7706 if Present
(Formal_Node
) then
7707 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
7709 if Present
(Formal_Ent
) then
7710 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
7712 (Formal_Node
, Formal_Ent
, Actual_Ent
);
7714 -- We iterate at the same time over the actuals of the
7715 -- local package created for the formal, to determine
7716 -- which one of the formals of the original generic were
7717 -- defaulted in the formal. The corresponding actual
7718 -- entities are visible in the enclosing instance.
7720 if Box_Present
(Formal
)
7722 (Present
(Actual_Of_Formal
)
7725 (Get_Formal_Entity
(Actual_Of_Formal
)))
7727 Set_Is_Hidden
(Actual_Ent
, False);
7728 Set_Is_Visible_Formal
(Actual_Ent
);
7729 Set_Is_Potentially_Use_Visible
7730 (Actual_Ent
, In_Use
(Actual_Pack
));
7732 if Ekind
(Actual_Ent
) = E_Package
then
7733 Process_Nested_Formal
(Actual_Ent
);
7737 Set_Is_Hidden
(Actual_Ent
);
7738 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
7742 Next_Non_Pragma
(Formal_Node
);
7743 Next
(Actual_Of_Formal
);
7746 -- No further formals to match, but the generic part may
7747 -- contain inherited operation that are not hidden in the
7748 -- enclosing instance.
7750 Next_Entity
(Actual_Ent
);
7754 -- Inherited subprograms generated by formal derived types are
7755 -- also visible if the types are.
7757 Actual_Ent
:= First_Entity
(Actual_Pack
);
7758 while Present
(Actual_Ent
)
7759 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7761 if Is_Overloadable
(Actual_Ent
)
7763 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
7765 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
7767 Set_Is_Hidden
(Actual_Ent
, False);
7768 Set_Is_Potentially_Use_Visible
7769 (Actual_Ent
, In_Use
(Actual_Pack
));
7772 Next_Entity
(Actual_Ent
);
7776 -- If the formal is not declared with a box, reanalyze it as an
7777 -- abbreviated instantiation, to verify the matching rules of 12.7.
7778 -- The actual checks are performed after the generic associations
7779 -- have been analyzed, to guarantee the same visibility for this
7780 -- instantiation and for the actuals.
7782 -- In Ada 2005, the generic associations for the formal can include
7783 -- defaulted parameters. These are ignored during check. This
7784 -- internal instantiation is removed from the tree after conformance
7785 -- checking, because it contains formal declarations for those
7786 -- defaulted parameters, and those should not reach the back-end.
7788 if not Box_Present
(Formal
) then
7790 I_Pack
: constant Entity_Id
:=
7791 Make_Defining_Identifier
(Sloc
(Actual
),
7792 Chars
=> New_Internal_Name
('P'));
7795 Set_Is_Internal
(I_Pack
);
7798 Make_Package_Instantiation
(Sloc
(Actual
),
7799 Defining_Unit_Name
=> I_Pack
,
7802 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
7803 Generic_Associations
=>
7804 Generic_Associations
(Formal
)));
7810 end Instantiate_Formal_Package
;
7812 -----------------------------------
7813 -- Instantiate_Formal_Subprogram --
7814 -----------------------------------
7816 function Instantiate_Formal_Subprogram
7819 Analyzed_Formal
: Node_Id
) return Node_Id
7822 Formal_Sub
: constant Entity_Id
:=
7823 Defining_Unit_Name
(Specification
(Formal
));
7824 Analyzed_S
: constant Entity_Id
:=
7825 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7826 Decl_Node
: Node_Id
;
7830 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
7831 -- If the generic is a child unit, the parent has been installed on the
7832 -- scope stack, but a default subprogram cannot resolve to something on
7833 -- the parent because that parent is not really part of the visible
7834 -- context (it is there to resolve explicit local entities). If the
7835 -- default has resolved in this way, we remove the entity from
7836 -- immediate visibility and analyze the node again to emit an error
7837 -- message or find another visible candidate.
7839 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
7840 -- Perform legality check and raise exception on failure
7842 -----------------------
7843 -- From_Parent_Scope --
7844 -----------------------
7846 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
7847 Gen_Scope
: Node_Id
;
7850 Gen_Scope
:= Scope
(Analyzed_S
);
7851 while Present
(Gen_Scope
)
7852 and then Is_Child_Unit
(Gen_Scope
)
7854 if Scope
(Subp
) = Scope
(Gen_Scope
) then
7858 Gen_Scope
:= Scope
(Gen_Scope
);
7862 end From_Parent_Scope
;
7864 -----------------------------
7865 -- Valid_Actual_Subprogram --
7866 -----------------------------
7868 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
7872 if Is_Entity_Name
(Act
) then
7873 Act_E
:= Entity
(Act
);
7875 elsif Nkind
(Act
) = N_Selected_Component
7876 and then Is_Entity_Name
(Selector_Name
(Act
))
7878 Act_E
:= Entity
(Selector_Name
(Act
));
7884 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
7885 or else Nkind_In
(Act
, N_Attribute_Reference
,
7886 N_Indexed_Component
,
7887 N_Character_Literal
,
7888 N_Explicit_Dereference
)
7894 ("expect subprogram or entry name in instantiation of&",
7895 Instantiation_Node
, Formal_Sub
);
7896 Abandon_Instantiation
(Instantiation_Node
);
7898 end Valid_Actual_Subprogram
;
7900 -- Start of processing for Instantiate_Formal_Subprogram
7903 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
7905 -- The tree copy has created the proper instantiation sloc for the
7906 -- new specification. Use this location for all other constructed
7909 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
7911 -- Create new entity for the actual (New_Copy_Tree does not)
7913 Set_Defining_Unit_Name
7914 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7916 -- Create new entities for the each of the formals in the
7917 -- specification of the renaming declaration built for the actual.
7919 if Present
(Parameter_Specifications
(New_Spec
)) then
7923 F
:= First
(Parameter_Specifications
(New_Spec
));
7924 while Present
(F
) loop
7925 Set_Defining_Identifier
(F
,
7926 Make_Defining_Identifier
(Sloc
(F
),
7927 Chars
=> Chars
(Defining_Identifier
(F
))));
7933 -- Find entity of actual. If the actual is an attribute reference, it
7934 -- cannot be resolved here (its formal is missing) but is handled
7935 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7936 -- fully resolved subsequently, when the renaming declaration for the
7937 -- formal is analyzed. If it is an explicit dereference, resolve the
7938 -- prefix but not the actual itself, to prevent interpretation as call.
7940 if Present
(Actual
) then
7941 Loc
:= Sloc
(Actual
);
7942 Set_Sloc
(New_Spec
, Loc
);
7944 if Nkind
(Actual
) = N_Operator_Symbol
then
7945 Find_Direct_Name
(Actual
);
7947 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
7948 Analyze
(Prefix
(Actual
));
7950 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
7954 Valid_Actual_Subprogram
(Actual
);
7957 elsif Present
(Default_Name
(Formal
)) then
7958 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
7959 N_Selected_Component
,
7960 N_Indexed_Component
,
7961 N_Character_Literal
)
7962 and then Present
(Entity
(Default_Name
(Formal
)))
7964 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
7966 Nam
:= New_Copy
(Default_Name
(Formal
));
7967 Set_Sloc
(Nam
, Loc
);
7970 elsif Box_Present
(Formal
) then
7972 -- Actual is resolved at the point of instantiation. Create an
7973 -- identifier or operator with the same name as the formal.
7975 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
7976 Nam
:= Make_Operator_Symbol
(Loc
,
7977 Chars
=> Chars
(Formal_Sub
),
7978 Strval
=> No_String
);
7980 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
7983 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
7984 and then Null_Present
(Specification
(Formal
))
7986 -- Generate null body for procedure, for use in the instance
7989 Make_Subprogram_Body
(Loc
,
7990 Specification
=> New_Spec
,
7991 Declarations
=> New_List
,
7992 Handled_Statement_Sequence
=>
7993 Make_Handled_Sequence_Of_Statements
(Loc
,
7994 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
7996 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
8000 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
8002 ("missing actual&", Instantiation_Node
, Formal_Sub
);
8004 ("\in instantiation of & declared#",
8005 Instantiation_Node
, Scope
(Analyzed_S
));
8006 Abandon_Instantiation
(Instantiation_Node
);
8010 Make_Subprogram_Renaming_Declaration
(Loc
,
8011 Specification
=> New_Spec
,
8014 -- If we do not have an actual and the formal specified <> then set to
8015 -- get proper default.
8017 if No
(Actual
) and then Box_Present
(Formal
) then
8018 Set_From_Default
(Decl_Node
);
8021 -- Gather possible interpretations for the actual before analyzing the
8022 -- instance. If overloaded, it will be resolved when analyzing the
8023 -- renaming declaration.
8025 if Box_Present
(Formal
)
8026 and then No
(Actual
)
8030 if Is_Child_Unit
(Scope
(Analyzed_S
))
8031 and then Present
(Entity
(Nam
))
8033 if not Is_Overloaded
(Nam
) then
8035 if From_Parent_Scope
(Entity
(Nam
)) then
8036 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
8037 Set_Entity
(Nam
, Empty
);
8038 Set_Etype
(Nam
, Empty
);
8042 Set_Is_Immediately_Visible
(Entity
(Nam
));
8051 Get_First_Interp
(Nam
, I
, It
);
8053 while Present
(It
.Nam
) loop
8054 if From_Parent_Scope
(It
.Nam
) then
8058 Get_Next_Interp
(I
, It
);
8065 -- The generic instantiation freezes the actual. This can only be done
8066 -- once the actual is resolved, in the analysis of the renaming
8067 -- declaration. To make the formal subprogram entity available, we set
8068 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8069 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8070 -- of formal abstract subprograms.
8072 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
8074 -- We cannot analyze the renaming declaration, and thus find the actual,
8075 -- until all the actuals are assembled in the instance. For subsequent
8076 -- checks of other actuals, indicate the node that will hold the
8077 -- instance of this formal.
8079 Set_Instance_Of
(Analyzed_S
, Nam
);
8081 if Nkind
(Actual
) = N_Selected_Component
8082 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
8083 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
8085 -- The renaming declaration will create a body, which must appear
8086 -- outside of the instantiation, We move the renaming declaration
8087 -- out of the instance, and create an additional renaming inside,
8088 -- to prevent freezing anomalies.
8091 Anon_Id
: constant Entity_Id
:=
8092 Make_Defining_Identifier
8093 (Loc
, New_Internal_Name
('E'));
8095 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
8096 Insert_Before
(Instantiation_Node
, Decl_Node
);
8097 Analyze
(Decl_Node
);
8099 -- Now create renaming within the instance
8102 Make_Subprogram_Renaming_Declaration
(Loc
,
8103 Specification
=> New_Copy_Tree
(New_Spec
),
8104 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
8106 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
8107 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
8112 end Instantiate_Formal_Subprogram
;
8114 ------------------------
8115 -- Instantiate_Object --
8116 ------------------------
8118 function Instantiate_Object
8121 Analyzed_Formal
: Node_Id
) return List_Id
8123 Acc_Def
: Node_Id
:= Empty
;
8124 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
8125 Actual_Decl
: Node_Id
:= Empty
;
8126 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
8127 Decl_Node
: Node_Id
;
8130 List
: constant List_Id
:= New_List
;
8131 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
8132 Orig_Ftyp
: constant Entity_Id
:=
8133 Etype
(Defining_Identifier
(Analyzed_Formal
));
8134 Subt_Decl
: Node_Id
:= Empty
;
8135 Subt_Mark
: Node_Id
:= Empty
;
8138 if Present
(Subtype_Mark
(Formal
)) then
8139 Subt_Mark
:= Subtype_Mark
(Formal
);
8141 Check_Access_Definition
(Formal
);
8142 Acc_Def
:= Access_Definition
(Formal
);
8145 -- Sloc for error message on missing actual
8147 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
8149 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
8150 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
8153 Set_Parent
(List
, Parent
(Actual
));
8157 if Out_Present
(Formal
) then
8159 -- An IN OUT generic actual must be a name. The instantiation is a
8160 -- renaming declaration. The actual is the name being renamed. We
8161 -- use the actual directly, rather than a copy, because it is not
8162 -- used further in the list of actuals, and because a copy or a use
8163 -- of relocate_node is incorrect if the instance is nested within a
8164 -- generic. In order to simplify ASIS searches, the Generic_Parent
8165 -- field links the declaration to the generic association.
8170 Instantiation_Node
, Formal_Id
);
8172 ("\in instantiation of & declared#",
8174 Scope
(Defining_Identifier
(Analyzed_Formal
)));
8175 Abandon_Instantiation
(Instantiation_Node
);
8178 if Present
(Subt_Mark
) then
8180 Make_Object_Renaming_Declaration
(Loc
,
8181 Defining_Identifier
=> New_Copy
(Formal_Id
),
8182 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
8185 else pragma Assert
(Present
(Acc_Def
));
8187 Make_Object_Renaming_Declaration
(Loc
,
8188 Defining_Identifier
=> New_Copy
(Formal_Id
),
8189 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
8193 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8195 -- The analysis of the actual may produce insert_action nodes, so
8196 -- the declaration must have a context in which to attach them.
8198 Append
(Decl_Node
, List
);
8201 -- Return if the analysis of the actual reported some error
8203 if Etype
(Actual
) = Any_Type
then
8207 -- This check is performed here because Analyze_Object_Renaming will
8208 -- not check it when Comes_From_Source is False. Note though that the
8209 -- check for the actual being the name of an object will be performed
8210 -- in Analyze_Object_Renaming.
8212 if Is_Object_Reference
(Actual
)
8213 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
8216 ("illegal discriminant-dependent component for in out parameter",
8220 -- The actual has to be resolved in order to check that it is a
8221 -- variable (due to cases such as F(1), where F returns
8222 -- access to an array, and for overloaded prefixes).
8225 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
8227 if Is_Private_Type
(Ftyp
)
8228 and then not Is_Private_Type
(Etype
(Actual
))
8229 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
8230 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
8232 -- If the actual has the type of the full view of the formal, or
8233 -- else a non-private subtype of the formal, then the visibility
8234 -- of the formal type has changed. Add to the actuals a subtype
8235 -- declaration that will force the exchange of views in the body
8236 -- of the instance as well.
8239 Make_Subtype_Declaration
(Loc
,
8240 Defining_Identifier
=>
8241 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
8242 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
8244 Prepend
(Subt_Decl
, List
);
8246 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
8247 Exchange_Declarations
(Ftyp
);
8250 Resolve
(Actual
, Ftyp
);
8252 if not Denotes_Variable
(Actual
) then
8254 ("actual for& must be a variable", Actual
, Formal_Id
);
8256 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
8258 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8259 -- the type of the actual shall resolve to a specific anonymous
8262 if Ada_Version
< Ada_05
8264 Ekind
(Base_Type
(Ftyp
)) /=
8265 E_Anonymous_Access_Type
8267 Ekind
(Base_Type
(Etype
(Actual
))) /=
8268 E_Anonymous_Access_Type
8270 Error_Msg_NE
("type of actual does not match type of&",
8275 Note_Possible_Modification
(Actual
, Sure
=> True);
8277 -- Check for instantiation of atomic/volatile actual for
8278 -- non-atomic/volatile formal (RM C.6 (12)).
8280 if Is_Atomic_Object
(Actual
)
8281 and then not Is_Atomic
(Orig_Ftyp
)
8284 ("cannot instantiate non-atomic formal object " &
8285 "with atomic actual", Actual
);
8287 elsif Is_Volatile_Object
(Actual
)
8288 and then not Is_Volatile
(Orig_Ftyp
)
8291 ("cannot instantiate non-volatile formal object " &
8292 "with volatile actual", Actual
);
8298 -- The instantiation of a generic formal in-parameter is constant
8299 -- declaration. The actual is the expression for that declaration.
8301 if Present
(Actual
) then
8302 if Present
(Subt_Mark
) then
8304 else pragma Assert
(Present
(Acc_Def
));
8309 Make_Object_Declaration
(Loc
,
8310 Defining_Identifier
=> New_Copy
(Formal_Id
),
8311 Constant_Present
=> True,
8312 Object_Definition
=> New_Copy_Tree
(Def
),
8313 Expression
=> Actual
);
8315 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8317 -- A generic formal object of a tagged type is defined to be
8318 -- aliased so the new constant must also be treated as aliased.
8321 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
8323 Set_Aliased_Present
(Decl_Node
);
8326 Append
(Decl_Node
, List
);
8328 -- No need to repeat (pre-)analysis of some expression nodes
8329 -- already handled in Preanalyze_Actuals.
8331 if Nkind
(Actual
) /= N_Allocator
then
8334 -- Return if the analysis of the actual reported some error
8336 if Etype
(Actual
) = Any_Type
then
8342 Typ
: constant Entity_Id
:=
8344 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
8347 Freeze_Before
(Instantiation_Node
, Typ
);
8349 -- If the actual is an aggregate, perform name resolution on
8350 -- its components (the analysis of an aggregate does not do it)
8351 -- to capture local names that may be hidden if the generic is
8354 if Nkind
(Actual
) = N_Aggregate
then
8355 Preanalyze_And_Resolve
(Actual
, Typ
);
8358 if Is_Limited_Type
(Typ
)
8359 and then not OK_For_Limited_Init
(Actual
)
8362 ("initialization not allowed for limited types", Actual
);
8363 Explain_Limited_Type
(Typ
, Actual
);
8367 elsif Present
(Default_Expression
(Formal
)) then
8369 -- Use default to construct declaration
8371 if Present
(Subt_Mark
) then
8373 else pragma Assert
(Present
(Acc_Def
));
8378 Make_Object_Declaration
(Sloc
(Formal
),
8379 Defining_Identifier
=> New_Copy
(Formal_Id
),
8380 Constant_Present
=> True,
8381 Object_Definition
=> New_Copy
(Def
),
8382 Expression
=> New_Copy_Tree
8383 (Default_Expression
(Formal
)));
8385 Append
(Decl_Node
, List
);
8386 Set_Analyzed
(Expression
(Decl_Node
), False);
8391 Instantiation_Node
, Formal_Id
);
8392 Error_Msg_NE
("\in instantiation of & declared#",
8394 Scope
(Defining_Identifier
(Analyzed_Formal
)));
8397 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
8399 -- Create dummy constant declaration so that instance can be
8400 -- analyzed, to minimize cascaded visibility errors.
8402 if Present
(Subt_Mark
) then
8404 else pragma Assert
(Present
(Acc_Def
));
8409 Make_Object_Declaration
(Loc
,
8410 Defining_Identifier
=> New_Copy
(Formal_Id
),
8411 Constant_Present
=> True,
8412 Object_Definition
=> New_Copy
(Def
),
8414 Make_Attribute_Reference
(Sloc
(Formal_Id
),
8415 Attribute_Name
=> Name_First
,
8416 Prefix
=> New_Copy
(Def
)));
8418 Append
(Decl_Node
, List
);
8421 Abandon_Instantiation
(Instantiation_Node
);
8426 if Nkind
(Actual
) in N_Has_Entity
then
8427 Actual_Decl
:= Parent
(Entity
(Actual
));
8430 -- Ada 2005 (AI-423): For a formal object declaration with a null
8431 -- exclusion or an access definition that has a null exclusion: If the
8432 -- actual matching the formal object declaration denotes a generic
8433 -- formal object of another generic unit G, and the instantiation
8434 -- containing the actual occurs within the body of G or within the body
8435 -- of a generic unit declared within the declarative region of G, then
8436 -- the declaration of the formal object of G must have a null exclusion.
8437 -- Otherwise, the subtype of the actual matching the formal object
8438 -- declaration shall exclude null.
8440 if Ada_Version
>= Ada_05
8441 and then Present
(Actual_Decl
)
8443 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
8444 N_Object_Declaration
)
8445 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
8446 and then not Has_Null_Exclusion
(Actual_Decl
)
8447 and then Has_Null_Exclusion
(Analyzed_Formal
)
8449 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
8451 ("actual must exclude null to match generic formal#", Actual
);
8455 end Instantiate_Object
;
8457 ------------------------------
8458 -- Instantiate_Package_Body --
8459 ------------------------------
8461 procedure Instantiate_Package_Body
8462 (Body_Info
: Pending_Body_Info
;
8463 Inlined_Body
: Boolean := False;
8464 Body_Optional
: Boolean := False)
8466 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8467 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8468 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8470 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8471 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8472 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8473 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
8474 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
8476 Act_Body_Name
: Node_Id
;
8478 Gen_Body_Id
: Node_Id
;
8480 Act_Body_Id
: Entity_Id
;
8482 Parent_Installed
: Boolean := False;
8483 Save_Style_Check
: constant Boolean := Style_Check
;
8486 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8488 -- The instance body may already have been processed, as the parent of
8489 -- another instance that is inlined (Load_Parent_Of_Generic).
8491 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8495 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8497 -- Re-establish the state of information on which checks are suppressed.
8498 -- This information was set in Body_Info at the point of instantiation,
8499 -- and now we restore it so that the instance is compiled using the
8500 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8502 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8503 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8505 if No
(Gen_Body_Id
) then
8506 Load_Parent_Of_Generic
8507 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8508 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8511 -- Establish global variable for sloc adjustment and for error recovery
8513 Instantiation_Node
:= Inst_Node
;
8515 if Present
(Gen_Body_Id
) then
8516 Save_Env
(Gen_Unit
, Act_Decl_Id
);
8517 Style_Check
:= False;
8518 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
8520 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8522 Create_Instantiation_Source
8523 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
8527 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
8529 -- Build new name (possibly qualified) for body declaration
8531 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
8533 -- Some attributes of spec entity are not inherited by body entity
8535 Set_Handler_Records
(Act_Body_Id
, No_List
);
8537 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8538 N_Defining_Program_Unit_Name
8541 Make_Defining_Program_Unit_Name
(Loc
,
8542 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
8543 Defining_Identifier
=> Act_Body_Id
);
8545 Act_Body_Name
:= Act_Body_Id
;
8548 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
8550 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
8551 Check_Generic_Actuals
(Act_Decl_Id
, False);
8553 -- If it is a child unit, make the parent instance (which is an
8554 -- instance of the parent of the generic) visible. The parent
8555 -- instance is the prefix of the name of the generic unit.
8557 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
8558 and then Nkind
(Gen_Id
) = N_Expanded_Name
8560 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
8561 Parent_Installed
:= True;
8563 elsif Is_Child_Unit
(Gen_Unit
) then
8564 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
8565 Parent_Installed
:= True;
8568 -- If the instantiation is a library unit, and this is the main unit,
8569 -- then build the resulting compilation unit nodes for the instance.
8570 -- If this is a compilation unit but it is not the main unit, then it
8571 -- is the body of a unit in the context, that is being compiled
8572 -- because it is encloses some inlined unit or another generic unit
8573 -- being instantiated. In that case, this body is not part of the
8574 -- current compilation, and is not attached to the tree, but its
8575 -- parent must be set for analysis.
8577 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8579 -- Replace instance node with body of instance, and create new
8580 -- node for corresponding instance declaration.
8582 Build_Instance_Compilation_Unit_Nodes
8583 (Inst_Node
, Act_Body
, Act_Decl
);
8584 Analyze
(Inst_Node
);
8586 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
8588 -- If the instance is a child unit itself, then set the scope
8589 -- of the expanded body to be the parent of the instantiation
8590 -- (ensuring that the fully qualified name will be generated
8591 -- for the elaboration subprogram).
8593 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8594 N_Defining_Program_Unit_Name
8597 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
8601 -- Case where instantiation is not a library unit
8604 -- If this is an early instantiation, i.e. appears textually
8605 -- before the corresponding body and must be elaborated first,
8606 -- indicate that the body instance is to be delayed.
8608 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
8610 -- Now analyze the body. We turn off all checks if this is an
8611 -- internal unit, since there is no reason to have checks on for
8612 -- any predefined run-time library code. All such code is designed
8613 -- to be compiled with checks off.
8615 -- Note that we do NOT apply this criterion to children of GNAT
8616 -- (or on VMS, children of DEC). The latter units must suppress
8617 -- checks explicitly if this is needed.
8619 if Is_Predefined_File_Name
8620 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
8622 Analyze
(Act_Body
, Suppress
=> All_Checks
);
8628 Inherit_Context
(Gen_Body
, Inst_Node
);
8630 -- Remove the parent instances if they have been placed on the scope
8631 -- stack to compile the body.
8633 if Parent_Installed
then
8634 Remove_Parent
(In_Body
=> True);
8637 Restore_Private_Views
(Act_Decl_Id
);
8639 -- Remove the current unit from visibility if this is an instance
8640 -- that is not elaborated on the fly for inlining purposes.
8642 if not Inlined_Body
then
8643 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
8647 Style_Check
:= Save_Style_Check
;
8649 -- If we have no body, and the unit requires a body, then complain. This
8650 -- complaint is suppressed if we have detected other errors (since a
8651 -- common reason for missing the body is that it had errors).
8653 elsif Unit_Requires_Body
(Gen_Unit
)
8654 and then not Body_Optional
8656 if Serious_Errors_Detected
= 0 then
8658 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
8660 -- Don't attempt to perform any cleanup actions if some other error
8661 -- was already detected, since this can cause blowups.
8667 -- Case of package that does not need a body
8670 -- If the instantiation of the declaration is a library unit, rewrite
8671 -- the original package instantiation as a package declaration in the
8672 -- compilation unit node.
8674 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8675 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
8676 Rewrite
(Inst_Node
, Act_Decl
);
8678 -- Generate elaboration entity, in case spec has elaboration code.
8679 -- This cannot be done when the instance is analyzed, because it
8680 -- is not known yet whether the body exists.
8682 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
8683 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
8685 -- If the instantiation is not a library unit, then append the
8686 -- declaration to the list of implicitly generated entities, unless
8687 -- it is already a list member which means that it was already
8690 elsif not Is_List_Member
(Act_Decl
) then
8691 Mark_Rewrite_Insertion
(Act_Decl
);
8692 Insert_Before
(Inst_Node
, Act_Decl
);
8696 Expander_Mode_Restore
;
8697 end Instantiate_Package_Body
;
8699 ---------------------------------
8700 -- Instantiate_Subprogram_Body --
8701 ---------------------------------
8703 procedure Instantiate_Subprogram_Body
8704 (Body_Info
: Pending_Body_Info
;
8705 Body_Optional
: Boolean := False)
8707 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8708 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8709 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8710 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8711 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8712 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8713 Anon_Id
: constant Entity_Id
:=
8714 Defining_Unit_Name
(Specification
(Act_Decl
));
8715 Pack_Id
: constant Entity_Id
:=
8716 Defining_Unit_Name
(Parent
(Act_Decl
));
8719 Gen_Body_Id
: Node_Id
;
8721 Pack_Body
: Node_Id
;
8722 Prev_Formal
: Entity_Id
;
8724 Unit_Renaming
: Node_Id
;
8726 Parent_Installed
: Boolean := False;
8727 Save_Style_Check
: constant Boolean := Style_Check
;
8730 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8732 -- Subprogram body may have been created already because of an inline
8733 -- pragma, or because of multiple elaborations of the enclosing package
8734 -- when several instances of the subprogram appear in the main unit.
8736 if Present
(Corresponding_Body
(Act_Decl
)) then
8740 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8742 -- Re-establish the state of information on which checks are suppressed.
8743 -- This information was set in Body_Info at the point of instantiation,
8744 -- and now we restore it so that the instance is compiled using the
8745 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8747 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8748 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8750 if No
(Gen_Body_Id
) then
8752 -- For imported generic subprogram, no body to compile, complete
8753 -- the spec entity appropriately.
8755 if Is_Imported
(Gen_Unit
) then
8756 Set_Is_Imported
(Anon_Id
);
8757 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
8758 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
8759 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
8760 Set_Has_Completion
(Anon_Id
);
8763 -- For other cases, compile the body
8766 Load_Parent_Of_Generic
8767 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8768 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8772 Instantiation_Node
:= Inst_Node
;
8774 if Present
(Gen_Body_Id
) then
8775 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8777 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
8779 -- Either body is not present, or context is non-expanding, as
8780 -- when compiling a subunit. Mark the instance as completed, and
8781 -- diagnose a missing body when needed.
8784 and then Operating_Mode
= Generate_Code
8787 ("missing proper body for instantiation", Gen_Body
);
8790 Set_Has_Completion
(Anon_Id
);
8794 Save_Env
(Gen_Unit
, Anon_Id
);
8795 Style_Check
:= False;
8796 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
8797 Create_Instantiation_Source
8805 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
8807 -- Create proper defining name for the body, to correspond to
8808 -- the one in the spec.
8810 Set_Defining_Unit_Name
(Specification
(Act_Body
),
8811 Make_Defining_Identifier
8812 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
8813 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
8814 Set_Has_Completion
(Anon_Id
);
8815 Check_Generic_Actuals
(Pack_Id
, False);
8817 -- Generate a reference to link the visible subprogram instance to
8818 -- the generic body, which for navigation purposes is the only
8819 -- available source for the instance.
8822 (Related_Instance
(Pack_Id
),
8823 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
8825 -- If it is a child unit, make the parent instance (which is an
8826 -- instance of the parent of the generic) visible. The parent
8827 -- instance is the prefix of the name of the generic unit.
8829 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
8830 and then Nkind
(Gen_Id
) = N_Expanded_Name
8832 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
8833 Parent_Installed
:= True;
8835 elsif Is_Child_Unit
(Gen_Unit
) then
8836 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
8837 Parent_Installed
:= True;
8840 -- Inside its body, a reference to the generic unit is a reference
8841 -- to the instance. The corresponding renaming is the first
8842 -- declaration in the body.
8845 Make_Subprogram_Renaming_Declaration
(Loc
,
8848 Specification
(Original_Node
(Gen_Body
)),
8850 Instantiating
=> True),
8851 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
8853 -- If there is a formal subprogram with the same name as the unit
8854 -- itself, do not add this renaming declaration. This is a temporary
8855 -- fix for one ACVC test. ???
8857 Prev_Formal
:= First_Entity
(Pack_Id
);
8858 while Present
(Prev_Formal
) loop
8859 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
8860 and then Is_Overloadable
(Prev_Formal
)
8865 Next_Entity
(Prev_Formal
);
8868 if Present
(Prev_Formal
) then
8869 Decls
:= New_List
(Act_Body
);
8871 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
8874 -- The subprogram body is placed in the body of a dummy package body,
8875 -- whose spec contains the subprogram declaration as well as the
8876 -- renaming declarations for the generic parameters.
8878 Pack_Body
:= Make_Package_Body
(Loc
,
8879 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
8880 Declarations
=> Decls
);
8882 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
8884 -- If the instantiation is a library unit, then build resulting
8885 -- compilation unit nodes for the instance. The declaration of
8886 -- the enclosing package is the grandparent of the subprogram
8887 -- declaration. First replace the instantiation node as the unit
8888 -- of the corresponding compilation.
8890 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8891 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
8892 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
8893 Build_Instance_Compilation_Unit_Nodes
8894 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
8895 Analyze
(Inst_Node
);
8897 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
8898 Analyze
(Pack_Body
);
8902 Insert_Before
(Inst_Node
, Pack_Body
);
8903 Mark_Rewrite_Insertion
(Pack_Body
);
8904 Analyze
(Pack_Body
);
8906 if Expander_Active
then
8907 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
8911 Inherit_Context
(Gen_Body
, Inst_Node
);
8913 Restore_Private_Views
(Pack_Id
, False);
8915 if Parent_Installed
then
8916 Remove_Parent
(In_Body
=> True);
8920 Style_Check
:= Save_Style_Check
;
8922 -- Body not found. Error was emitted already. If there were no previous
8923 -- errors, this may be an instance whose scope is a premature instance.
8924 -- In that case we must insure that the (legal) program does raise
8925 -- program error if executed. We generate a subprogram body for this
8926 -- purpose. See DEC ac30vso.
8928 -- Should not reference proprietary DEC tests in comments ???
8930 elsif Serious_Errors_Detected
= 0
8931 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
8933 if Body_Optional
then
8936 elsif Ekind
(Anon_Id
) = E_Procedure
then
8938 Make_Subprogram_Body
(Loc
,
8940 Make_Procedure_Specification
(Loc
,
8941 Defining_Unit_Name
=>
8942 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
8943 Parameter_Specifications
=>
8945 (Parameter_Specifications
(Parent
(Anon_Id
)))),
8947 Declarations
=> Empty_List
,
8948 Handled_Statement_Sequence
=>
8949 Make_Handled_Sequence_Of_Statements
(Loc
,
8952 Make_Raise_Program_Error
(Loc
,
8954 PE_Access_Before_Elaboration
))));
8958 Make_Raise_Program_Error
(Loc
,
8959 Reason
=> PE_Access_Before_Elaboration
);
8961 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
8962 Set_Analyzed
(Ret_Expr
);
8965 Make_Subprogram_Body
(Loc
,
8967 Make_Function_Specification
(Loc
,
8968 Defining_Unit_Name
=>
8969 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
8970 Parameter_Specifications
=>
8972 (Parameter_Specifications
(Parent
(Anon_Id
))),
8973 Result_Definition
=>
8974 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
8976 Declarations
=> Empty_List
,
8977 Handled_Statement_Sequence
=>
8978 Make_Handled_Sequence_Of_Statements
(Loc
,
8981 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
8984 Pack_Body
:= Make_Package_Body
(Loc
,
8985 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
8986 Declarations
=> New_List
(Act_Body
));
8988 Insert_After
(Inst_Node
, Pack_Body
);
8989 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
8990 Analyze
(Pack_Body
);
8993 Expander_Mode_Restore
;
8994 end Instantiate_Subprogram_Body
;
8996 ----------------------
8997 -- Instantiate_Type --
8998 ----------------------
9000 function Instantiate_Type
9003 Analyzed_Formal
: Node_Id
;
9004 Actual_Decls
: List_Id
) return List_Id
9006 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
9007 A_Gen_T
: constant Entity_Id
:=
9008 Defining_Identifier
(Analyzed_Formal
);
9009 Ancestor
: Entity_Id
:= Empty
;
9010 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
9012 Decl_Node
: Node_Id
;
9013 Decl_Nodes
: List_Id
;
9017 procedure Validate_Array_Type_Instance
;
9018 procedure Validate_Access_Subprogram_Instance
;
9019 procedure Validate_Access_Type_Instance
;
9020 procedure Validate_Derived_Type_Instance
;
9021 procedure Validate_Derived_Interface_Type_Instance
;
9022 procedure Validate_Interface_Type_Instance
;
9023 procedure Validate_Private_Type_Instance
;
9024 -- These procedures perform validation tests for the named case
9026 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
9027 -- Check that base types are the same and that the subtypes match
9028 -- statically. Used in several of the above.
9030 --------------------
9031 -- Subtypes_Match --
9032 --------------------
9034 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
9035 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
9038 return (Base_Type
(T
) = Base_Type
(Act_T
)
9039 and then Subtypes_Statically_Match
(T
, Act_T
))
9041 or else (Is_Class_Wide_Type
(Gen_T
)
9042 and then Is_Class_Wide_Type
(Act_T
)
9045 (Get_Instance_Of
(Root_Type
(Gen_T
)),
9049 ((Ekind
(Gen_T
) = E_Anonymous_Access_Subprogram_Type
9050 or else Ekind
(Gen_T
) = E_Anonymous_Access_Type
)
9051 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
9053 Subtypes_Statically_Match
9054 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
9057 -----------------------------------------
9058 -- Validate_Access_Subprogram_Instance --
9059 -----------------------------------------
9061 procedure Validate_Access_Subprogram_Instance
is
9063 if not Is_Access_Type
(Act_T
)
9064 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
9067 ("expect access type in instantiation of &", Actual
, Gen_T
);
9068 Abandon_Instantiation
(Actual
);
9071 Check_Mode_Conformant
9072 (Designated_Type
(Act_T
),
9073 Designated_Type
(A_Gen_T
),
9077 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
9078 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
9080 ("protected access type not allowed for formal &",
9084 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
9086 ("expect protected access type for formal &",
9089 end Validate_Access_Subprogram_Instance
;
9091 -----------------------------------
9092 -- Validate_Access_Type_Instance --
9093 -----------------------------------
9095 procedure Validate_Access_Type_Instance
is
9096 Desig_Type
: constant Entity_Id
:=
9097 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
9098 Desig_Act
: Entity_Id
;
9101 if not Is_Access_Type
(Act_T
) then
9103 ("expect access type in instantiation of &", Actual
, Gen_T
);
9104 Abandon_Instantiation
(Actual
);
9107 if Is_Access_Constant
(A_Gen_T
) then
9108 if not Is_Access_Constant
(Act_T
) then
9110 ("actual type must be access-to-constant type", Actual
);
9111 Abandon_Instantiation
(Actual
);
9114 if Is_Access_Constant
(Act_T
) then
9116 ("actual type must be access-to-variable type", Actual
);
9117 Abandon_Instantiation
(Actual
);
9119 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
9120 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
9122 Error_Msg_N
("actual must be general access type!", Actual
);
9123 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
9124 Abandon_Instantiation
(Actual
);
9128 -- The designated subtypes, that is to say the subtypes introduced
9129 -- by an access type declaration (and not by a subtype declaration)
9132 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
9134 -- The designated type may have been introduced through a limited_
9135 -- with clause, in which case retrieve the non-limited view. This
9136 -- applies to incomplete types as well as to class-wide types.
9138 if From_With_Type
(Desig_Act
) then
9139 Desig_Act
:= Available_View
(Desig_Act
);
9142 if not Subtypes_Match
9143 (Desig_Type
, Desig_Act
) then
9145 ("designated type of actual does not match that of formal &",
9147 Abandon_Instantiation
(Actual
);
9149 elsif Is_Access_Type
(Designated_Type
(Act_T
))
9150 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
9152 Is_Constrained
(Designated_Type
(Desig_Type
))
9155 ("designated type of actual does not match that of formal &",
9157 Abandon_Instantiation
(Actual
);
9160 -- Ada 2005: null-exclusion indicators of the two types must agree
9162 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
9164 ("non null exclusion of actual and formal & do not match",
9167 end Validate_Access_Type_Instance
;
9169 ----------------------------------
9170 -- Validate_Array_Type_Instance --
9171 ----------------------------------
9173 procedure Validate_Array_Type_Instance
is
9178 function Formal_Dimensions
return Int
;
9179 -- Count number of dimensions in array type formal
9181 -----------------------
9182 -- Formal_Dimensions --
9183 -----------------------
9185 function Formal_Dimensions
return Int
is
9190 if Nkind
(Def
) = N_Constrained_Array_Definition
then
9191 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
9193 Index
:= First
(Subtype_Marks
(Def
));
9196 while Present
(Index
) loop
9202 end Formal_Dimensions
;
9204 -- Start of processing for Validate_Array_Type_Instance
9207 if not Is_Array_Type
(Act_T
) then
9209 ("expect array type in instantiation of &", Actual
, Gen_T
);
9210 Abandon_Instantiation
(Actual
);
9212 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
9213 if not (Is_Constrained
(Act_T
)) then
9215 ("expect constrained array in instantiation of &",
9217 Abandon_Instantiation
(Actual
);
9221 if Is_Constrained
(Act_T
) then
9223 ("expect unconstrained array in instantiation of &",
9225 Abandon_Instantiation
(Actual
);
9229 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
9231 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
9232 Abandon_Instantiation
(Actual
);
9235 I1
:= First_Index
(A_Gen_T
);
9236 I2
:= First_Index
(Act_T
);
9237 for J
in 1 .. Formal_Dimensions
loop
9239 -- If the indices of the actual were given by a subtype_mark,
9240 -- the index was transformed into a range attribute. Retrieve
9241 -- the original type mark for checking.
9243 if Is_Entity_Name
(Original_Node
(I2
)) then
9244 T2
:= Entity
(Original_Node
(I2
));
9249 if not Subtypes_Match
9250 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
9253 ("index types of actual do not match those of formal &",
9255 Abandon_Instantiation
(Actual
);
9262 -- Check matching subtypes. Note that there are complex visibility
9263 -- issues when the generic is a child unit and some aspect of the
9264 -- generic type is declared in a parent unit of the generic. We do
9265 -- the test to handle this special case only after a direct check
9266 -- for static matching has failed.
9269 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
9270 or else Subtypes_Match
9271 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
9272 Component_Type
(Act_T
))
9277 ("component subtype of actual does not match that of formal &",
9279 Abandon_Instantiation
(Actual
);
9282 if Has_Aliased_Components
(A_Gen_T
)
9283 and then not Has_Aliased_Components
(Act_T
)
9286 ("actual must have aliased components to match formal type &",
9289 end Validate_Array_Type_Instance
;
9291 -----------------------------------------------
9292 -- Validate_Derived_Interface_Type_Instance --
9293 -----------------------------------------------
9295 procedure Validate_Derived_Interface_Type_Instance
is
9296 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
9300 -- First apply interface instance checks
9302 Validate_Interface_Type_Instance
;
9304 -- Verify that immediate parent interface is an ancestor of
9308 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
9311 ("interface actual must include progenitor&", Actual
, Par
);
9314 -- Now verify that the actual includes all other ancestors of
9317 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
9318 while Present
(Elmt
) loop
9319 if not Interface_Present_In_Ancestor
9320 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
9323 ("interface actual must include progenitor&",
9324 Actual
, Node
(Elmt
));
9329 end Validate_Derived_Interface_Type_Instance
;
9331 ------------------------------------
9332 -- Validate_Derived_Type_Instance --
9333 ------------------------------------
9335 procedure Validate_Derived_Type_Instance
is
9336 Actual_Discr
: Entity_Id
;
9337 Ancestor_Discr
: Entity_Id
;
9340 -- If the parent type in the generic declaration is itself a previous
9341 -- formal type, then it is local to the generic and absent from the
9342 -- analyzed generic definition. In that case the ancestor is the
9343 -- instance of the formal (which must have been instantiated
9344 -- previously), unless the ancestor is itself a formal derived type.
9345 -- In this latter case (which is the subject of Corrigendum 8652/0038
9346 -- (AI-202) the ancestor of the formals is the ancestor of its
9347 -- parent. Otherwise, the analyzed generic carries the parent type.
9348 -- If the parent type is defined in a previous formal package, then
9349 -- the scope of that formal package is that of the generic type
9350 -- itself, and it has already been mapped into the corresponding type
9351 -- in the actual package.
9353 -- Common case: parent type defined outside of the generic
9355 if Is_Entity_Name
(Subtype_Mark
(Def
))
9356 and then Present
(Entity
(Subtype_Mark
(Def
)))
9358 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
9360 -- Check whether parent is defined in a previous formal package
9363 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
9366 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
9368 -- The type may be a local derivation, or a type extension of a
9369 -- previous formal, or of a formal of a parent package.
9371 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
9373 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
9375 -- Check whether the parent is another derived formal type in the
9376 -- same generic unit.
9378 if Etype
(A_Gen_T
) /= A_Gen_T
9379 and then Is_Generic_Type
(Etype
(A_Gen_T
))
9380 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
9381 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
9383 -- Locate ancestor of parent from the subtype declaration
9384 -- created for the actual.
9390 Decl
:= First
(Actual_Decls
);
9391 while Present
(Decl
) loop
9392 if Nkind
(Decl
) = N_Subtype_Declaration
9393 and then Chars
(Defining_Identifier
(Decl
)) =
9394 Chars
(Etype
(A_Gen_T
))
9396 Ancestor
:= Generic_Parent_Type
(Decl
);
9404 pragma Assert
(Present
(Ancestor
));
9408 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
9412 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
9415 -- If the formal derived type has pragma Preelaborable_Initialization
9416 -- then the actual type must have preelaborable initialization.
9418 if Known_To_Have_Preelab_Init
(A_Gen_T
)
9419 and then not Has_Preelaborable_Initialization
(Act_T
)
9422 ("actual for & must have preelaborable initialization",
9426 -- Ada 2005 (AI-251)
9428 if Ada_Version
>= Ada_05
9429 and then Is_Interface
(Ancestor
)
9431 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
9433 ("(Ada 2005) expected type implementing & in instantiation",
9437 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
9439 ("expect type derived from & in instantiation",
9440 Actual
, First_Subtype
(Ancestor
));
9441 Abandon_Instantiation
(Actual
);
9444 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
9445 -- that the formal type declaration has been rewritten as a private
9448 if Ada_Version
>= Ada_05
9449 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
9450 and then Synchronized_Present
(Parent
(A_Gen_T
))
9452 -- The actual must be a synchronized tagged type
9454 if not Is_Tagged_Type
(Act_T
) then
9456 ("actual of synchronized type must be tagged", Actual
);
9457 Abandon_Instantiation
(Actual
);
9459 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
9460 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
9461 N_Derived_Type_Definition
9462 and then not Synchronized_Present
(Type_Definition
9466 ("actual of synchronized type must be synchronized", Actual
);
9467 Abandon_Instantiation
(Actual
);
9471 -- Perform atomic/volatile checks (RM C.6(12))
9473 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
9475 ("cannot have atomic actual type for non-atomic formal type",
9478 elsif Is_Volatile
(Act_T
)
9479 and then not Is_Volatile
(Ancestor
)
9480 and then Is_By_Reference_Type
(Ancestor
)
9483 ("cannot have volatile actual type for non-volatile formal type",
9487 -- It should not be necessary to check for unknown discriminants on
9488 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9489 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9490 -- needs fixing. ???
9492 if not Is_Indefinite_Subtype
(A_Gen_T
)
9493 and then not Unknown_Discriminants_Present
(Formal
)
9494 and then Is_Indefinite_Subtype
(Act_T
)
9497 ("actual subtype must be constrained", Actual
);
9498 Abandon_Instantiation
(Actual
);
9501 if not Unknown_Discriminants_Present
(Formal
) then
9502 if Is_Constrained
(Ancestor
) then
9503 if not Is_Constrained
(Act_T
) then
9505 ("actual subtype must be constrained", Actual
);
9506 Abandon_Instantiation
(Actual
);
9509 -- Ancestor is unconstrained, Check if generic formal and actual
9510 -- agree on constrainedness. The check only applies to array types
9511 -- and discriminated types.
9513 elsif Is_Constrained
(Act_T
) then
9514 if Ekind
(Ancestor
) = E_Access_Type
9516 (not Is_Constrained
(A_Gen_T
)
9517 and then Is_Composite_Type
(A_Gen_T
))
9520 ("actual subtype must be unconstrained", Actual
);
9521 Abandon_Instantiation
(Actual
);
9524 -- A class-wide type is only allowed if the formal has unknown
9527 elsif Is_Class_Wide_Type
(Act_T
)
9528 and then not Has_Unknown_Discriminants
(Ancestor
)
9531 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
9532 Abandon_Instantiation
(Actual
);
9534 -- Otherwise, the formal and actual shall have the same number
9535 -- of discriminants and each discriminant of the actual must
9536 -- correspond to a discriminant of the formal.
9538 elsif Has_Discriminants
(Act_T
)
9539 and then not Has_Unknown_Discriminants
(Act_T
)
9540 and then Has_Discriminants
(Ancestor
)
9542 Actual_Discr
:= First_Discriminant
(Act_T
);
9543 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
9544 while Present
(Actual_Discr
)
9545 and then Present
(Ancestor_Discr
)
9547 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
9548 No
(Corresponding_Discriminant
(Actual_Discr
))
9551 ("discriminant & does not correspond " &
9552 "to ancestor discriminant", Actual
, Actual_Discr
);
9553 Abandon_Instantiation
(Actual
);
9556 Next_Discriminant
(Actual_Discr
);
9557 Next_Discriminant
(Ancestor_Discr
);
9560 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
9562 ("actual for & must have same number of discriminants",
9564 Abandon_Instantiation
(Actual
);
9567 -- This case should be caught by the earlier check for
9568 -- constrainedness, but the check here is added for completeness.
9570 elsif Has_Discriminants
(Act_T
)
9571 and then not Has_Unknown_Discriminants
(Act_T
)
9574 ("actual for & must not have discriminants", Actual
, Gen_T
);
9575 Abandon_Instantiation
(Actual
);
9577 elsif Has_Discriminants
(Ancestor
) then
9579 ("actual for & must have known discriminants", Actual
, Gen_T
);
9580 Abandon_Instantiation
(Actual
);
9583 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
9585 ("constraint on actual is incompatible with formal", Actual
);
9586 Abandon_Instantiation
(Actual
);
9590 -- If the formal and actual types are abstract, check that there
9591 -- are no abstract primitives of the actual type that correspond to
9592 -- nonabstract primitives of the formal type (second sentence of
9595 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
9596 Check_Abstract_Primitives
: declare
9597 Gen_Prims
: constant Elist_Id
:=
9598 Primitive_Operations
(A_Gen_T
);
9600 Gen_Subp
: Entity_Id
;
9601 Anc_Subp
: Entity_Id
;
9602 Anc_Formal
: Entity_Id
;
9603 Anc_F_Type
: Entity_Id
;
9605 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
9607 Act_Subp
: Entity_Id
;
9608 Act_Formal
: Entity_Id
;
9609 Act_F_Type
: Entity_Id
;
9611 Subprograms_Correspond
: Boolean;
9613 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
9614 -- Returns true if T2 is derived directly or indirectly from
9615 -- T1, including derivations from interfaces. T1 and T2 are
9616 -- required to be specific tagged base types.
9618 ------------------------
9619 -- Is_Tagged_Ancestor --
9620 ------------------------
9622 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
9624 Intfc_Elmt
: Elmt_Id
;
9627 -- The predicate is satisfied if the types are the same
9632 -- If we've reached the top of the derivation chain then
9633 -- we know that T1 is not an ancestor of T2.
9635 elsif Etype
(T2
) = T2
then
9638 -- Proceed to check T2's immediate parent
9640 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
9643 -- Finally, check to see if T1 is an ancestor of any of T2's
9647 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
9648 while Present
(Intfc_Elmt
) loop
9649 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
9653 Next_Elmt
(Intfc_Elmt
);
9658 end Is_Tagged_Ancestor
;
9660 -- Start of processing for Check_Abstract_Primitives
9663 -- Loop over all of the formal derived type's primitives
9665 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
9666 while Present
(Gen_Elmt
) loop
9667 Gen_Subp
:= Node
(Gen_Elmt
);
9669 -- If the primitive of the formal is not abstract, then
9670 -- determine whether there is a corresponding primitive of
9671 -- the actual type that's abstract.
9673 if not Is_Abstract_Subprogram
(Gen_Subp
) then
9674 Act_Elmt
:= First_Elmt
(Act_Prims
);
9675 while Present
(Act_Elmt
) loop
9676 Act_Subp
:= Node
(Act_Elmt
);
9678 -- If we find an abstract primitive of the actual,
9679 -- then we need to test whether it corresponds to the
9680 -- subprogram from which the generic formal primitive
9683 if Is_Abstract_Subprogram
(Act_Subp
) then
9684 Anc_Subp
:= Alias
(Gen_Subp
);
9686 -- Test whether we have a corresponding primitive
9687 -- by comparing names, kinds, formal types, and
9690 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
9691 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
9693 Anc_Formal
:= First_Formal
(Anc_Subp
);
9694 Act_Formal
:= First_Formal
(Act_Subp
);
9695 while Present
(Anc_Formal
)
9696 and then Present
(Act_Formal
)
9698 Anc_F_Type
:= Etype
(Anc_Formal
);
9699 Act_F_Type
:= Etype
(Act_Formal
);
9701 if Ekind
(Anc_F_Type
)
9702 = E_Anonymous_Access_Type
9704 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
9706 if Ekind
(Act_F_Type
)
9707 = E_Anonymous_Access_Type
9710 Designated_Type
(Act_F_Type
);
9716 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
9721 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
9722 Act_F_Type
:= Base_Type
(Act_F_Type
);
9724 -- If the formal is controlling, then the
9725 -- the type of the actual primitive's formal
9726 -- must be derived directly or indirectly
9727 -- from the type of the ancestor primitive's
9730 if Is_Controlling_Formal
(Anc_Formal
) then
9731 if not Is_Tagged_Ancestor
9732 (Anc_F_Type
, Act_F_Type
)
9737 -- Otherwise the types of the formals must
9740 elsif Anc_F_Type
/= Act_F_Type
then
9744 Next_Entity
(Anc_Formal
);
9745 Next_Entity
(Act_Formal
);
9748 -- If we traversed through all of the formals
9749 -- then so far the subprograms correspond, so
9750 -- now check that any result types correspond.
9753 and then No
(Act_Formal
)
9755 Subprograms_Correspond
:= True;
9757 if Ekind
(Act_Subp
) = E_Function
then
9758 Anc_F_Type
:= Etype
(Anc_Subp
);
9759 Act_F_Type
:= Etype
(Act_Subp
);
9761 if Ekind
(Anc_F_Type
)
9762 = E_Anonymous_Access_Type
9765 Designated_Type
(Anc_F_Type
);
9767 if Ekind
(Act_F_Type
)
9768 = E_Anonymous_Access_Type
9771 Designated_Type
(Act_F_Type
);
9773 Subprograms_Correspond
:= False;
9778 = E_Anonymous_Access_Type
9780 Subprograms_Correspond
:= False;
9783 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
9784 Act_F_Type
:= Base_Type
(Act_F_Type
);
9786 -- Now either the result types must be
9787 -- the same or, if the result type is
9788 -- controlling, the result type of the
9789 -- actual primitive must descend from the
9790 -- result type of the ancestor primitive.
9792 if Subprograms_Correspond
9793 and then Anc_F_Type
/= Act_F_Type
9795 Has_Controlling_Result
(Anc_Subp
)
9797 not Is_Tagged_Ancestor
9798 (Anc_F_Type
, Act_F_Type
)
9800 Subprograms_Correspond
:= False;
9804 -- Found a matching subprogram belonging to
9805 -- formal ancestor type, so actual subprogram
9806 -- corresponds and this violates 3.9.3(9).
9808 if Subprograms_Correspond
then
9810 ("abstract subprogram & overrides " &
9811 "nonabstract subprogram of ancestor",
9819 Next_Elmt
(Act_Elmt
);
9823 Next_Elmt
(Gen_Elmt
);
9825 end Check_Abstract_Primitives
;
9828 -- Verify that limitedness matches. If parent is a limited
9829 -- interface then the generic formal is not unless declared
9830 -- explicitly so. If not declared limited, the actual cannot be
9831 -- limited (see AI05-0087).
9832 -- Disable check for now, limited interfaces implemented by
9833 -- protected types are common, Need to update tests ???
9835 if Is_Limited_Type
(Act_T
)
9836 and then not Is_Limited_Type
(A_Gen_T
)
9840 ("actual for non-limited & cannot be a limited type", Actual
,
9842 Explain_Limited_Type
(Act_T
, Actual
);
9843 Abandon_Instantiation
(Actual
);
9845 end Validate_Derived_Type_Instance
;
9847 --------------------------------------
9848 -- Validate_Interface_Type_Instance --
9849 --------------------------------------
9851 procedure Validate_Interface_Type_Instance
is
9853 if not Is_Interface
(Act_T
) then
9855 ("actual for formal interface type must be an interface",
9858 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
9860 Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
9862 Is_Protected_Interface
(A_Gen_T
) /=
9863 Is_Protected_Interface
(Act_T
)
9865 Is_Synchronized_Interface
(A_Gen_T
) /=
9866 Is_Synchronized_Interface
(Act_T
)
9869 ("actual for interface& does not match (RM 12.5.5(4))",
9872 end Validate_Interface_Type_Instance
;
9874 ------------------------------------
9875 -- Validate_Private_Type_Instance --
9876 ------------------------------------
9878 procedure Validate_Private_Type_Instance
is
9879 Formal_Discr
: Entity_Id
;
9880 Actual_Discr
: Entity_Id
;
9881 Formal_Subt
: Entity_Id
;
9884 if Is_Limited_Type
(Act_T
)
9885 and then not Is_Limited_Type
(A_Gen_T
)
9888 ("actual for non-limited & cannot be a limited type", Actual
,
9890 Explain_Limited_Type
(Act_T
, Actual
);
9891 Abandon_Instantiation
(Actual
);
9893 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
9894 and then not Has_Preelaborable_Initialization
(Act_T
)
9897 ("actual for & must have preelaborable initialization", Actual
,
9900 elsif Is_Indefinite_Subtype
(Act_T
)
9901 and then not Is_Indefinite_Subtype
(A_Gen_T
)
9902 and then Ada_Version
>= Ada_95
9905 ("actual for & must be a definite subtype", Actual
, Gen_T
);
9907 elsif not Is_Tagged_Type
(Act_T
)
9908 and then Is_Tagged_Type
(A_Gen_T
)
9911 ("actual for & must be a tagged type", Actual
, Gen_T
);
9913 elsif Has_Discriminants
(A_Gen_T
) then
9914 if not Has_Discriminants
(Act_T
) then
9916 ("actual for & must have discriminants", Actual
, Gen_T
);
9917 Abandon_Instantiation
(Actual
);
9919 elsif Is_Constrained
(Act_T
) then
9921 ("actual for & must be unconstrained", Actual
, Gen_T
);
9922 Abandon_Instantiation
(Actual
);
9925 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
9926 Actual_Discr
:= First_Discriminant
(Act_T
);
9927 while Formal_Discr
/= Empty
loop
9928 if Actual_Discr
= Empty
then
9930 ("discriminants on actual do not match formal",
9932 Abandon_Instantiation
(Actual
);
9935 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
9937 -- Access discriminants match if designated types do
9939 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
9940 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
9941 E_Anonymous_Access_Type
9944 (Designated_Type
(Base_Type
(Formal_Subt
))) =
9945 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
9949 elsif Base_Type
(Formal_Subt
) /=
9950 Base_Type
(Etype
(Actual_Discr
))
9953 ("types of actual discriminants must match formal",
9955 Abandon_Instantiation
(Actual
);
9957 elsif not Subtypes_Statically_Match
9958 (Formal_Subt
, Etype
(Actual_Discr
))
9959 and then Ada_Version
>= Ada_95
9962 ("subtypes of actual discriminants must match formal",
9964 Abandon_Instantiation
(Actual
);
9967 Next_Discriminant
(Formal_Discr
);
9968 Next_Discriminant
(Actual_Discr
);
9971 if Actual_Discr
/= Empty
then
9973 ("discriminants on actual do not match formal",
9975 Abandon_Instantiation
(Actual
);
9982 end Validate_Private_Type_Instance
;
9984 -- Start of processing for Instantiate_Type
9987 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
9988 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
9989 return New_List
(Error
);
9991 elsif not Is_Entity_Name
(Actual
)
9992 or else not Is_Type
(Entity
(Actual
))
9995 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
9996 Abandon_Instantiation
(Actual
);
9999 Act_T
:= Entity
(Actual
);
10001 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
10002 -- as a generic actual parameter if the corresponding formal type
10003 -- does not have a known_discriminant_part, or is a formal derived
10004 -- type that is an Unchecked_Union type.
10006 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
10007 if not Has_Discriminants
(A_Gen_T
)
10009 (Is_Derived_Type
(A_Gen_T
)
10011 Is_Unchecked_Union
(A_Gen_T
))
10015 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
10016 " discriminated formal type", Act_T
);
10021 -- Deal with fixed/floating restrictions
10023 if Is_Floating_Point_Type
(Act_T
) then
10024 Check_Restriction
(No_Floating_Point
, Actual
);
10025 elsif Is_Fixed_Point_Type
(Act_T
) then
10026 Check_Restriction
(No_Fixed_Point
, Actual
);
10029 -- Deal with error of using incomplete type as generic actual.
10030 -- This includes limited views of a type, even if the non-limited
10031 -- view may be available.
10033 if Ekind
(Act_T
) = E_Incomplete_Type
10034 or else (Is_Class_Wide_Type
(Act_T
)
10036 Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
10038 if Is_Class_Wide_Type
(Act_T
)
10039 or else No
(Full_View
(Act_T
))
10041 Error_Msg_N
("premature use of incomplete type", Actual
);
10042 Abandon_Instantiation
(Actual
);
10044 Act_T
:= Full_View
(Act_T
);
10045 Set_Entity
(Actual
, Act_T
);
10047 if Has_Private_Component
(Act_T
) then
10049 ("premature use of type with private component", Actual
);
10053 -- Deal with error of premature use of private type as generic actual
10055 elsif Is_Private_Type
(Act_T
)
10056 and then Is_Private_Type
(Base_Type
(Act_T
))
10057 and then not Is_Generic_Type
(Act_T
)
10058 and then not Is_Derived_Type
(Act_T
)
10059 and then No
(Full_View
(Root_Type
(Act_T
)))
10061 Error_Msg_N
("premature use of private type", Actual
);
10063 elsif Has_Private_Component
(Act_T
) then
10065 ("premature use of type with private component", Actual
);
10068 Set_Instance_Of
(A_Gen_T
, Act_T
);
10070 -- If the type is generic, the class-wide type may also be used
10072 if Is_Tagged_Type
(A_Gen_T
)
10073 and then Is_Tagged_Type
(Act_T
)
10074 and then not Is_Class_Wide_Type
(A_Gen_T
)
10076 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
10077 Class_Wide_Type
(Act_T
));
10080 if not Is_Abstract_Type
(A_Gen_T
)
10081 and then Is_Abstract_Type
(Act_T
)
10084 ("actual of non-abstract formal cannot be abstract", Actual
);
10087 -- A generic scalar type is a first subtype for which we generate
10088 -- an anonymous base type. Indicate that the instance of this base
10089 -- is the base type of the actual.
10091 if Is_Scalar_Type
(A_Gen_T
) then
10092 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
10096 if Error_Posted
(Act_T
) then
10099 case Nkind
(Def
) is
10100 when N_Formal_Private_Type_Definition
=>
10101 Validate_Private_Type_Instance
;
10103 when N_Formal_Derived_Type_Definition
=>
10104 Validate_Derived_Type_Instance
;
10106 when N_Formal_Discrete_Type_Definition
=>
10107 if not Is_Discrete_Type
(Act_T
) then
10109 ("expect discrete type in instantiation of&",
10111 Abandon_Instantiation
(Actual
);
10114 when N_Formal_Signed_Integer_Type_Definition
=>
10115 if not Is_Signed_Integer_Type
(Act_T
) then
10117 ("expect signed integer type in instantiation of&",
10119 Abandon_Instantiation
(Actual
);
10122 when N_Formal_Modular_Type_Definition
=>
10123 if not Is_Modular_Integer_Type
(Act_T
) then
10125 ("expect modular type in instantiation of &",
10127 Abandon_Instantiation
(Actual
);
10130 when N_Formal_Floating_Point_Definition
=>
10131 if not Is_Floating_Point_Type
(Act_T
) then
10133 ("expect float type in instantiation of &", Actual
, Gen_T
);
10134 Abandon_Instantiation
(Actual
);
10137 when N_Formal_Ordinary_Fixed_Point_Definition
=>
10138 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
10140 ("expect ordinary fixed point type in instantiation of &",
10142 Abandon_Instantiation
(Actual
);
10145 when N_Formal_Decimal_Fixed_Point_Definition
=>
10146 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
10148 ("expect decimal type in instantiation of &",
10150 Abandon_Instantiation
(Actual
);
10153 when N_Array_Type_Definition
=>
10154 Validate_Array_Type_Instance
;
10156 when N_Access_To_Object_Definition
=>
10157 Validate_Access_Type_Instance
;
10159 when N_Access_Function_Definition |
10160 N_Access_Procedure_Definition
=>
10161 Validate_Access_Subprogram_Instance
;
10163 when N_Record_Definition
=>
10164 Validate_Interface_Type_Instance
;
10166 when N_Derived_Type_Definition
=>
10167 Validate_Derived_Interface_Type_Instance
;
10170 raise Program_Error
;
10175 Subt
:= New_Copy
(Gen_T
);
10177 -- Use adjusted sloc of subtype name as the location for other nodes in
10178 -- the subtype declaration.
10180 Loc
:= Sloc
(Subt
);
10183 Make_Subtype_Declaration
(Loc
,
10184 Defining_Identifier
=> Subt
,
10185 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
10187 if Is_Private_Type
(Act_T
) then
10188 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10190 elsif Is_Access_Type
(Act_T
)
10191 and then Is_Private_Type
(Designated_Type
(Act_T
))
10193 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10196 Decl_Nodes
:= New_List
(Decl_Node
);
10198 -- Flag actual derived types so their elaboration produces the
10199 -- appropriate renamings for the primitive operations of the ancestor.
10200 -- Flag actual for formal private types as well, to determine whether
10201 -- operations in the private part may override inherited operations.
10202 -- If the formal has an interface list, the ancestor is not the
10203 -- parent, but the analyzed formal that includes the interface
10204 -- operations of all its progenitors.
10206 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
10207 if Present
(Interface_List
(Def
)) then
10208 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
10210 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
10213 elsif Nkind
(Def
) = N_Formal_Private_Type_Definition
then
10214 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
10217 -- If the actual is a synchronized type that implements an interface,
10218 -- the primitive operations are attached to the corresponding record,
10219 -- and we have to treat it as an additional generic actual, so that its
10220 -- primitive operations become visible in the instance. The task or
10221 -- protected type itself does not carry primitive operations.
10223 if Is_Concurrent_Type
(Act_T
)
10224 and then Is_Tagged_Type
(Act_T
)
10225 and then Present
(Corresponding_Record_Type
(Act_T
))
10226 and then Present
(Ancestor
)
10227 and then Is_Interface
(Ancestor
)
10230 Corr_Rec
: constant Entity_Id
:=
10231 Corresponding_Record_Type
(Act_T
);
10232 New_Corr
: Entity_Id
;
10233 Corr_Decl
: Node_Id
;
10236 New_Corr
:= Make_Defining_Identifier
(Loc
,
10237 Chars
=> New_Internal_Name
('S'));
10239 Make_Subtype_Declaration
(Loc
,
10240 Defining_Identifier
=> New_Corr
,
10241 Subtype_Indication
=>
10242 New_Reference_To
(Corr_Rec
, Loc
));
10243 Append_To
(Decl_Nodes
, Corr_Decl
);
10245 if Ekind
(Act_T
) = E_Task_Type
then
10246 Set_Ekind
(Subt
, E_Task_Subtype
);
10248 Set_Ekind
(Subt
, E_Protected_Subtype
);
10251 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
10252 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
10253 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
10258 end Instantiate_Type
;
10260 -----------------------
10261 -- Is_Generic_Formal --
10262 -----------------------
10264 function Is_Generic_Formal
(E
: Entity_Id
) return Boolean is
10270 Kind
:= Nkind
(Parent
(E
));
10272 Nkind_In
(Kind
, N_Formal_Object_Declaration
,
10273 N_Formal_Package_Declaration
,
10274 N_Formal_Type_Declaration
)
10276 (Is_Formal_Subprogram
(E
)
10278 Nkind
(Parent
(Parent
(E
))) in
10279 N_Formal_Subprogram_Declaration
);
10281 end Is_Generic_Formal
;
10283 ---------------------
10284 -- Is_In_Main_Unit --
10285 ---------------------
10287 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
10288 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
10289 Current_Unit
: Node_Id
;
10292 if Unum
= Main_Unit
then
10295 -- If the current unit is a subunit then it is either the main unit or
10296 -- is being compiled as part of the main unit.
10298 elsif Nkind
(N
) = N_Compilation_Unit
then
10299 return Nkind
(Unit
(N
)) = N_Subunit
;
10302 Current_Unit
:= Parent
(N
);
10303 while Present
(Current_Unit
)
10304 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
10306 Current_Unit
:= Parent
(Current_Unit
);
10309 -- The instantiation node is in the main unit, or else the current node
10310 -- (perhaps as the result of nested instantiations) is in the main unit,
10311 -- or in the declaration of the main unit, which in this last case must
10314 return Unum
= Main_Unit
10315 or else Current_Unit
= Cunit
(Main_Unit
)
10316 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
10317 or else (Present
(Library_Unit
(Current_Unit
))
10318 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
10319 end Is_In_Main_Unit
;
10321 ----------------------------
10322 -- Load_Parent_Of_Generic --
10323 ----------------------------
10325 procedure Load_Parent_Of_Generic
10328 Body_Optional
: Boolean := False)
10330 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
10331 Save_Style_Check
: constant Boolean := Style_Check
;
10332 True_Parent
: Node_Id
;
10333 Inst_Node
: Node_Id
;
10335 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
10337 procedure Collect_Previous_Instances
(Decls
: List_Id
);
10338 -- Collect all instantiations in the given list of declarations, that
10339 -- precede the generic that we need to load. If the bodies of these
10340 -- instantiations are available, we must analyze them, to ensure that
10341 -- the public symbols generated are the same when the unit is compiled
10342 -- to generate code, and when it is compiled in the context of a unit
10343 -- that needs a particular nested instance. This process is applied
10344 -- to both package and subprogram instances.
10346 --------------------------------
10347 -- Collect_Previous_Instances --
10348 --------------------------------
10350 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
10354 Decl
:= First
(Decls
);
10355 while Present
(Decl
) loop
10356 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
10359 -- If Decl is an instantiation, then record it as requiring
10360 -- instantiation of the corresponding body, except if it is an
10361 -- abbreviated instantiation generated internally for conformance
10362 -- checking purposes only for the case of a formal package
10363 -- declared without a box (see Instantiate_Formal_Package). Such
10364 -- an instantiation does not generate any code (the actual code
10365 -- comes from actual) and thus does not need to be analyzed here.
10367 elsif Nkind
(Decl
) = N_Package_Instantiation
10368 and then not Is_Internal
(Defining_Entity
(Decl
))
10370 Append_Elmt
(Decl
, Previous_Instances
);
10372 -- For a subprogram instantiation, omit instantiations of
10373 -- intrinsic operations (Unchecked_Conversions, etc.) that
10376 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
10377 N_Procedure_Instantiation
)
10378 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
10380 Append_Elmt
(Decl
, Previous_Instances
);
10382 elsif Nkind
(Decl
) = N_Package_Declaration
then
10383 Collect_Previous_Instances
10384 (Visible_Declarations
(Specification
(Decl
)));
10385 Collect_Previous_Instances
10386 (Private_Declarations
(Specification
(Decl
)));
10388 elsif Nkind
(Decl
) = N_Package_Body
then
10389 Collect_Previous_Instances
(Declarations
(Decl
));
10394 end Collect_Previous_Instances
;
10396 -- Start of processing for Load_Parent_Of_Generic
10399 if not In_Same_Source_Unit
(N
, Spec
)
10400 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
10401 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
10402 and then not Is_In_Main_Unit
(Spec
))
10404 -- Find body of parent of spec, and analyze it. A special case arises
10405 -- when the parent is an instantiation, that is to say when we are
10406 -- currently instantiating a nested generic. In that case, there is
10407 -- no separate file for the body of the enclosing instance. Instead,
10408 -- the enclosing body must be instantiated as if it were a pending
10409 -- instantiation, in order to produce the body for the nested generic
10410 -- we require now. Note that in that case the generic may be defined
10411 -- in a package body, the instance defined in the same package body,
10412 -- and the original enclosing body may not be in the main unit.
10414 Inst_Node
:= Empty
;
10416 True_Parent
:= Parent
(Spec
);
10417 while Present
(True_Parent
)
10418 and then Nkind
(True_Parent
) /= N_Compilation_Unit
10420 if Nkind
(True_Parent
) = N_Package_Declaration
10422 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
10424 -- Parent is a compilation unit that is an instantiation.
10425 -- Instantiation node has been replaced with package decl.
10427 Inst_Node
:= Original_Node
(True_Parent
);
10430 elsif Nkind
(True_Parent
) = N_Package_Declaration
10431 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
10432 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10434 -- Parent is an instantiation within another specification.
10435 -- Declaration for instance has been inserted before original
10436 -- instantiation node. A direct link would be preferable?
10438 Inst_Node
:= Next
(True_Parent
);
10439 while Present
(Inst_Node
)
10440 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
10445 -- If the instance appears within a generic, and the generic
10446 -- unit is defined within a formal package of the enclosing
10447 -- generic, there is no generic body available, and none
10448 -- needed. A more precise test should be used ???
10450 if No
(Inst_Node
) then
10457 True_Parent
:= Parent
(True_Parent
);
10461 -- Case where we are currently instantiating a nested generic
10463 if Present
(Inst_Node
) then
10464 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
10466 -- Instantiation node and declaration of instantiated package
10467 -- were exchanged when only the declaration was needed.
10468 -- Restore instantiation node before proceeding with body.
10470 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
10473 -- Now complete instantiation of enclosing body, if it appears
10474 -- in some other unit. If it appears in the current unit, the
10475 -- body will have been instantiated already.
10477 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
10479 -- We need to determine the expander mode to instantiate the
10480 -- enclosing body. Because the generic body we need may use
10481 -- global entities declared in the enclosing package (including
10482 -- aggregates) it is in general necessary to compile this body
10483 -- with expansion enabled. The exception is if we are within a
10484 -- generic package, in which case the usual generic rule
10488 Exp_Status
: Boolean := True;
10492 -- Loop through scopes looking for generic package
10494 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
10495 while Present
(Scop
)
10496 and then Scop
/= Standard_Standard
10498 if Ekind
(Scop
) = E_Generic_Package
then
10499 Exp_Status
:= False;
10503 Scop
:= Scope
(Scop
);
10506 -- Collect previous instantiations in the unit that
10507 -- contains the desired generic.
10509 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10510 and then not Body_Optional
10514 Info
: Pending_Body_Info
;
10518 Par
:= Parent
(Inst_Node
);
10519 while Present
(Par
) loop
10520 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
10521 Par
:= Parent
(Par
);
10524 pragma Assert
(Present
(Par
));
10526 if Nkind
(Par
) = N_Package_Body
then
10527 Collect_Previous_Instances
(Declarations
(Par
));
10529 elsif Nkind
(Par
) = N_Package_Declaration
then
10530 Collect_Previous_Instances
10531 (Visible_Declarations
(Specification
(Par
)));
10532 Collect_Previous_Instances
10533 (Private_Declarations
(Specification
(Par
)));
10536 -- Enclosing unit is a subprogram body, In this
10537 -- case all instance bodies are processed in order
10538 -- and there is no need to collect them separately.
10543 Decl
:= First_Elmt
(Previous_Instances
);
10544 while Present
(Decl
) loop
10546 (Inst_Node
=> Node
(Decl
),
10548 Instance_Spec
(Node
(Decl
)),
10549 Expander_Status
=> Exp_Status
,
10550 Current_Sem_Unit
=>
10551 Get_Code_Unit
(Sloc
(Node
(Decl
))),
10552 Scope_Suppress
=> Scope_Suppress
,
10553 Local_Suppress_Stack_Top
=>
10554 Local_Suppress_Stack_Top
);
10556 -- Package instance
10559 Nkind
(Node
(Decl
)) = N_Package_Instantiation
10561 Instantiate_Package_Body
10562 (Info
, Body_Optional
=> True);
10564 -- Subprogram instance
10567 -- The instance_spec is the wrapper package,
10568 -- and the subprogram declaration is the last
10569 -- declaration in the wrapper.
10573 (Visible_Declarations
10574 (Specification
(Info
.Act_Decl
)));
10576 Instantiate_Subprogram_Body
10577 (Info
, Body_Optional
=> True);
10585 Instantiate_Package_Body
10587 ((Inst_Node
=> Inst_Node
,
10588 Act_Decl
=> True_Parent
,
10589 Expander_Status
=> Exp_Status
,
10590 Current_Sem_Unit
=>
10591 Get_Code_Unit
(Sloc
(Inst_Node
)),
10592 Scope_Suppress
=> Scope_Suppress
,
10593 Local_Suppress_Stack_Top
=>
10594 Local_Suppress_Stack_Top
)),
10595 Body_Optional
=> Body_Optional
);
10599 -- Case where we are not instantiating a nested generic
10602 Opt
.Style_Check
:= False;
10603 Expander_Mode_Save_And_Set
(True);
10604 Load_Needed_Body
(Comp_Unit
, OK
);
10605 Opt
.Style_Check
:= Save_Style_Check
;
10606 Expander_Mode_Restore
;
10609 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
10610 and then not Body_Optional
10613 Bname
: constant Unit_Name_Type
:=
10614 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
10617 Error_Msg_Unit_1
:= Bname
;
10618 Error_Msg_N
("this instantiation requires$!", N
);
10619 Error_Msg_File_1
:= Get_File_Name
(Bname
, Subunit
=> False);
10620 Error_Msg_N
("\but file{ was not found!", N
);
10621 raise Unrecoverable_Error
;
10627 -- If loading parent of the generic caused an instantiation circularity,
10628 -- we abandon compilation at this point, because otherwise in some cases
10629 -- we get into trouble with infinite recursions after this point.
10631 if Circularity_Detected
then
10632 raise Unrecoverable_Error
;
10634 end Load_Parent_Of_Generic
;
10636 -----------------------
10637 -- Move_Freeze_Nodes --
10638 -----------------------
10640 procedure Move_Freeze_Nodes
10641 (Out_Of
: Entity_Id
;
10646 Next_Decl
: Node_Id
;
10647 Next_Node
: Node_Id
:= After
;
10650 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
10651 -- Check whether entity is declared in a scope external to that
10652 -- of the generic unit.
10654 -------------------
10655 -- Is_Outer_Type --
10656 -------------------
10658 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
10659 Scop
: Entity_Id
:= Scope
(T
);
10662 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
10666 while Scop
/= Standard_Standard
loop
10667 if Scop
= Out_Of
then
10670 Scop
:= Scope
(Scop
);
10678 -- Start of processing for Move_Freeze_Nodes
10685 -- First remove the freeze nodes that may appear before all other
10689 while Present
(Decl
)
10690 and then Nkind
(Decl
) = N_Freeze_Entity
10691 and then Is_Outer_Type
(Entity
(Decl
))
10693 Decl
:= Remove_Head
(L
);
10694 Insert_After
(Next_Node
, Decl
);
10695 Set_Analyzed
(Decl
, False);
10700 -- Next scan the list of declarations and remove each freeze node that
10701 -- appears ahead of the current node.
10703 while Present
(Decl
) loop
10704 while Present
(Next
(Decl
))
10705 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
10706 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
10708 Next_Decl
:= Remove_Next
(Decl
);
10709 Insert_After
(Next_Node
, Next_Decl
);
10710 Set_Analyzed
(Next_Decl
, False);
10711 Next_Node
:= Next_Decl
;
10714 -- If the declaration is a nested package or concurrent type, then
10715 -- recurse. Nested generic packages will have been processed from the
10718 if Nkind
(Decl
) = N_Package_Declaration
then
10719 Spec
:= Specification
(Decl
);
10721 elsif Nkind
(Decl
) = N_Task_Type_Declaration
then
10722 Spec
:= Task_Definition
(Decl
);
10724 elsif Nkind
(Decl
) = N_Protected_Type_Declaration
then
10725 Spec
:= Protected_Definition
(Decl
);
10731 if Present
(Spec
) then
10732 Move_Freeze_Nodes
(Out_Of
, Next_Node
,
10733 Visible_Declarations
(Spec
));
10734 Move_Freeze_Nodes
(Out_Of
, Next_Node
,
10735 Private_Declarations
(Spec
));
10740 end Move_Freeze_Nodes
;
10746 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
10748 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
10751 ------------------------
10752 -- Preanalyze_Actuals --
10753 ------------------------
10755 procedure Preanalyze_Actuals
(N
: Node_Id
) is
10758 Errs
: constant Int
:= Serious_Errors_Detected
;
10761 Assoc
:= First
(Generic_Associations
(N
));
10762 while Present
(Assoc
) loop
10763 if Nkind
(Assoc
) /= N_Others_Choice
then
10764 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
10766 -- Within a nested instantiation, a defaulted actual is an empty
10767 -- association, so nothing to analyze. If the subprogram actual
10768 -- is an attribute, analyze prefix only, because actual is not a
10769 -- complete attribute reference.
10771 -- If actual is an allocator, analyze expression only. The full
10772 -- analysis can generate code, and if instance is a compilation
10773 -- unit we have to wait until the package instance is installed
10774 -- to have a proper place to insert this code.
10776 -- String literals may be operators, but at this point we do not
10777 -- know whether the actual is a formal subprogram or a string.
10782 elsif Nkind
(Act
) = N_Attribute_Reference
then
10783 Analyze
(Prefix
(Act
));
10785 elsif Nkind
(Act
) = N_Explicit_Dereference
then
10786 Analyze
(Prefix
(Act
));
10788 elsif Nkind
(Act
) = N_Allocator
then
10790 Expr
: constant Node_Id
:= Expression
(Act
);
10793 if Nkind
(Expr
) = N_Subtype_Indication
then
10794 Analyze
(Subtype_Mark
(Expr
));
10796 -- Analyze separately each discriminant constraint,
10797 -- when given with a named association.
10803 Constr
:= First
(Constraints
(Constraint
(Expr
)));
10804 while Present
(Constr
) loop
10805 if Nkind
(Constr
) = N_Discriminant_Association
then
10806 Analyze
(Expression
(Constr
));
10820 elsif Nkind
(Act
) /= N_Operator_Symbol
then
10824 if Errs
/= Serious_Errors_Detected
then
10826 -- Do a minimal analysis of the generic, to prevent spurious
10827 -- warnings complaining about the generic being unreferenced,
10828 -- before abandoning the instantiation.
10830 Analyze
(Name
(N
));
10832 if Is_Entity_Name
(Name
(N
))
10833 and then Etype
(Name
(N
)) /= Any_Type
10835 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
10836 Set_Is_Instantiated
(Entity
(Name
(N
)));
10839 Abandon_Instantiation
(Act
);
10845 end Preanalyze_Actuals
;
10847 -------------------
10848 -- Remove_Parent --
10849 -------------------
10851 procedure Remove_Parent
(In_Body
: Boolean := False) is
10852 S
: Entity_Id
:= Current_Scope
;
10853 -- S is the scope containing the instantiation just completed. The
10854 -- scope stack contains the parent instances of the instantiation,
10855 -- followed by the original S.
10862 -- After child instantiation is complete, remove from scope stack the
10863 -- extra copy of the current scope, and then remove parent instances.
10865 if not In_Body
then
10868 while Current_Scope
/= S
loop
10869 P
:= Current_Scope
;
10870 End_Package_Scope
(Current_Scope
);
10872 if In_Open_Scopes
(P
) then
10873 E
:= First_Entity
(P
);
10874 while Present
(E
) loop
10875 Set_Is_Immediately_Visible
(E
, True);
10879 if Is_Generic_Instance
(Current_Scope
)
10880 and then P
/= Current_Scope
10882 -- We are within an instance of some sibling. Retain
10883 -- visibility of parent, for proper subsequent cleanup,
10884 -- and reinstall private declarations as well.
10886 Set_In_Private_Part
(P
);
10887 Install_Private_Declarations
(P
);
10890 -- If the ultimate parent is a top-level unit recorded in
10891 -- Instance_Parent_Unit, then reset its visibility to what
10892 -- it was before instantiation. (It's not clear what the
10893 -- purpose is of testing whether Scope (P) is In_Open_Scopes,
10894 -- but that test was present before the ultimate parent test
10897 elsif not In_Open_Scopes
(Scope
(P
))
10898 or else (P
= Instance_Parent_Unit
10899 and then not Parent_Unit_Visible
)
10901 Set_Is_Immediately_Visible
(P
, False);
10903 -- If the current scope is itself an instantiation of a generic
10904 -- nested within P, and we are in the private part of body of this
10905 -- instantiation, restore the full views of P, that were removed
10906 -- in End_Package_Scope above. This obscure case can occur when a
10907 -- subunit of a generic contains an instance of a child unit of
10908 -- its generic parent unit.
10910 elsif S
= Current_Scope
10911 and then Is_Generic_Instance
(S
)
10914 Par
: constant Entity_Id
:=
10916 (Specification
(Unit_Declaration_Node
(S
)));
10919 and then P
= Scope
(Par
)
10920 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
10922 Set_In_Private_Part
(P
);
10923 Install_Private_Declarations
(P
);
10929 -- Reset visibility of entities in the enclosing scope
10931 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
10933 Hidden
:= First_Elmt
(Hidden_Entities
);
10934 while Present
(Hidden
) loop
10935 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
10936 Next_Elmt
(Hidden
);
10940 -- Each body is analyzed separately, and there is no context
10941 -- that needs preserving from one body instance to the next,
10942 -- so remove all parent scopes that have been installed.
10944 while Present
(S
) loop
10945 End_Package_Scope
(S
);
10946 Set_Is_Immediately_Visible
(S
, False);
10947 S
:= Current_Scope
;
10948 exit when S
= Standard_Standard
;
10957 procedure Restore_Env
is
10958 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
10961 if No
(Current_Instantiated_Parent
.Act_Id
) then
10963 -- Restore environment after subprogram inlining
10965 Restore_Private_Views
(Empty
);
10968 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
10969 Exchanged_Views
:= Saved
.Exchanged_Views
;
10970 Hidden_Entities
:= Saved
.Hidden_Entities
;
10971 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
10972 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
10973 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
10975 Restore_Opt_Config_Switches
(Saved
.Switches
);
10977 Instance_Envs
.Decrement_Last
;
10980 ---------------------------
10981 -- Restore_Private_Views --
10982 ---------------------------
10984 procedure Restore_Private_Views
10985 (Pack_Id
: Entity_Id
;
10986 Is_Package
: Boolean := True)
10991 Dep_Elmt
: Elmt_Id
;
10994 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
10995 -- Hide the generic formals of formal packages declared with box
10996 -- which were reachable in the current instantiation.
10998 ---------------------------
10999 -- Restore_Nested_Formal --
11000 ---------------------------
11002 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
11006 if Present
(Renamed_Object
(Formal
))
11007 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
11011 elsif Present
(Associated_Formal_Package
(Formal
)) then
11012 Ent
:= First_Entity
(Formal
);
11013 while Present
(Ent
) loop
11014 exit when Ekind
(Ent
) = E_Package
11015 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
11017 Set_Is_Hidden
(Ent
);
11018 Set_Is_Potentially_Use_Visible
(Ent
, False);
11020 -- If package, then recurse
11022 if Ekind
(Ent
) = E_Package
then
11023 Restore_Nested_Formal
(Ent
);
11029 end Restore_Nested_Formal
;
11031 -- Start of processing for Restore_Private_Views
11034 M
:= First_Elmt
(Exchanged_Views
);
11035 while Present
(M
) loop
11038 -- Subtypes of types whose views have been exchanged, and that
11039 -- are defined within the instance, were not on the list of
11040 -- Private_Dependents on entry to the instance, so they have to
11041 -- be exchanged explicitly now, in order to remain consistent with
11042 -- the view of the parent type.
11044 if Ekind
(Typ
) = E_Private_Type
11045 or else Ekind
(Typ
) = E_Limited_Private_Type
11046 or else Ekind
(Typ
) = E_Record_Type_With_Private
11048 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
11049 while Present
(Dep_Elmt
) loop
11050 Dep_Typ
:= Node
(Dep_Elmt
);
11052 if Scope
(Dep_Typ
) = Pack_Id
11053 and then Present
(Full_View
(Dep_Typ
))
11055 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
11056 Exchange_Declarations
(Dep_Typ
);
11059 Next_Elmt
(Dep_Elmt
);
11063 Exchange_Declarations
(Node
(M
));
11067 if No
(Pack_Id
) then
11071 -- Make the generic formal parameters private, and make the formal
11072 -- types into subtypes of the actuals again.
11074 E
:= First_Entity
(Pack_Id
);
11075 while Present
(E
) loop
11076 Set_Is_Hidden
(E
, True);
11079 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
11081 Set_Is_Generic_Actual_Type
(E
, False);
11083 -- An unusual case of aliasing: the actual may also be directly
11084 -- visible in the generic, and be private there, while it is fully
11085 -- visible in the context of the instance. The internal subtype
11086 -- is private in the instance, but has full visibility like its
11087 -- parent in the enclosing scope. This enforces the invariant that
11088 -- the privacy status of all private dependents of a type coincide
11089 -- with that of the parent type. This can only happen when a
11090 -- generic child unit is instantiated within sibling.
11092 if Is_Private_Type
(E
)
11093 and then not Is_Private_Type
(Etype
(E
))
11095 Exchange_Declarations
(E
);
11098 elsif Ekind
(E
) = E_Package
then
11100 -- The end of the renaming list is the renaming of the generic
11101 -- package itself. If the instance is a subprogram, all entities
11102 -- in the corresponding package are renamings. If this entity is
11103 -- a formal package, make its own formals private as well. The
11104 -- actual in this case is itself the renaming of an instantiation.
11105 -- If the entity is not a package renaming, it is the entity
11106 -- created to validate formal package actuals: ignore.
11108 -- If the actual is itself a formal package for the enclosing
11109 -- generic, or the actual for such a formal package, it remains
11110 -- visible on exit from the instance, and therefore nothing needs
11111 -- to be done either, except to keep it accessible.
11114 and then Renamed_Object
(E
) = Pack_Id
11118 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
11121 elsif Denotes_Formal_Package
(Renamed_Object
(E
), True) then
11122 Set_Is_Hidden
(E
, False);
11126 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
11130 Id
:= First_Entity
(Act_P
);
11132 and then Id
/= First_Private_Entity
(Act_P
)
11134 exit when Ekind
(Id
) = E_Package
11135 and then Renamed_Object
(Id
) = Act_P
;
11137 Set_Is_Hidden
(Id
, True);
11138 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
11140 if Ekind
(Id
) = E_Package
then
11141 Restore_Nested_Formal
(Id
);
11152 end Restore_Private_Views
;
11159 (Gen_Unit
: Entity_Id
;
11160 Act_Unit
: Entity_Id
)
11164 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
11167 ----------------------------
11168 -- Save_Global_References --
11169 ----------------------------
11171 procedure Save_Global_References
(N
: Node_Id
) is
11172 Gen_Scope
: Entity_Id
;
11176 function Is_Global
(E
: Entity_Id
) return Boolean;
11177 -- Check whether entity is defined outside of generic unit. Examine the
11178 -- scope of an entity, and the scope of the scope, etc, until we find
11179 -- either Standard, in which case the entity is global, or the generic
11180 -- unit itself, which indicates that the entity is local. If the entity
11181 -- is the generic unit itself, as in the case of a recursive call, or
11182 -- the enclosing generic unit, if different from the current scope, then
11183 -- it is local as well, because it will be replaced at the point of
11184 -- instantiation. On the other hand, if it is a reference to a child
11185 -- unit of a common ancestor, which appears in an instantiation, it is
11186 -- global because it is used to denote a specific compilation unit at
11187 -- the time the instantiations will be analyzed.
11189 procedure Reset_Entity
(N
: Node_Id
);
11190 -- Save semantic information on global entity, so that it is not
11191 -- resolved again at instantiation time.
11193 procedure Save_Entity_Descendants
(N
: Node_Id
);
11194 -- Apply Save_Global_References to the two syntactic descendants of
11195 -- non-terminal nodes that carry an Associated_Node and are processed
11196 -- through Reset_Entity. Once the global entity (if any) has been
11197 -- captured together with its type, only two syntactic descendants need
11198 -- to be traversed to complete the processing of the tree rooted at N.
11199 -- This applies to Selected_Components, Expanded_Names, and to Operator
11200 -- nodes. N can also be a character literal, identifier, or operator
11201 -- symbol node, but the call has no effect in these cases.
11203 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
11204 -- Default actuals in nested instances must be handled specially
11205 -- because there is no link to them from the original tree. When an
11206 -- actual subprogram is given by a default, we add an explicit generic
11207 -- association for it in the instantiation node. When we save the
11208 -- global references on the name of the instance, we recover the list
11209 -- of generic associations, and add an explicit one to the original
11210 -- generic tree, through which a global actual can be preserved.
11211 -- Similarly, if a child unit is instantiated within a sibling, in the
11212 -- context of the parent, we must preserve the identifier of the parent
11213 -- so that it can be properly resolved in a subsequent instantiation.
11215 procedure Save_Global_Descendant
(D
: Union_Id
);
11216 -- Apply Save_Global_References recursively to the descendents of the
11219 procedure Save_References
(N
: Node_Id
);
11220 -- This is the recursive procedure that does the work, once the
11221 -- enclosing generic scope has been established.
11227 function Is_Global
(E
: Entity_Id
) return Boolean is
11230 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
11231 -- Determine whether the parent node of a reference to a child unit
11232 -- denotes an instantiation or a formal package, in which case the
11233 -- reference to the child unit is global, even if it appears within
11234 -- the current scope (e.g. when the instance appears within the body
11235 -- of an ancestor).
11237 ----------------------
11238 -- Is_Instance_Node --
11239 ----------------------
11241 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
11243 return (Nkind
(Decl
) in N_Generic_Instantiation
11245 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
);
11246 end Is_Instance_Node
;
11248 -- Start of processing for Is_Global
11251 if E
= Gen_Scope
then
11254 elsif E
= Standard_Standard
then
11257 elsif Is_Child_Unit
(E
)
11258 and then (Is_Instance_Node
(Parent
(N2
))
11259 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
11260 and then N2
= Selector_Name
(Parent
(N2
))
11262 Is_Instance_Node
(Parent
(Parent
(N2
)))))
11268 while Se
/= Gen_Scope
loop
11269 if Se
= Standard_Standard
then
11284 procedure Reset_Entity
(N
: Node_Id
) is
11286 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
11287 -- If the type of N2 is global to the generic unit. Save
11288 -- the type in the generic node.
11290 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
11291 -- Find the ultimate ancestor of the current unit. If it is
11292 -- not a generic unit, then the name of the current unit
11293 -- in the prefix of an expanded name must be replaced with
11294 -- its generic homonym to ensure that it will be properly
11295 -- resolved in an instance.
11297 ---------------------
11298 -- Set_Global_Type --
11299 ---------------------
11301 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
11302 Typ
: constant Entity_Id
:= Etype
(N2
);
11305 Set_Etype
(N
, Typ
);
11307 if Entity
(N
) /= N2
11308 and then Has_Private_View
(Entity
(N
))
11310 -- If the entity of N is not the associated node, this is
11311 -- a nested generic and it has an associated node as well,
11312 -- whose type is already the full view (see below). Indicate
11313 -- that the original node has a private view.
11315 Set_Has_Private_View
(N
);
11318 -- If not a private type, nothing else to do
11320 if not Is_Private_Type
(Typ
) then
11321 if Is_Array_Type
(Typ
)
11322 and then Is_Private_Type
(Component_Type
(Typ
))
11324 Set_Has_Private_View
(N
);
11327 -- If it is a derivation of a private type in a context where
11328 -- no full view is needed, nothing to do either.
11330 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
11333 -- Otherwise mark the type for flipping and use the full_view
11337 Set_Has_Private_View
(N
);
11339 if Present
(Full_View
(Typ
)) then
11340 Set_Etype
(N2
, Full_View
(Typ
));
11343 end Set_Global_Type
;
11349 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
11354 while Is_Child_Unit
(Par
) loop
11355 Par
:= Scope
(Par
);
11361 -- Start of processing for Reset_Entity
11364 N2
:= Get_Associated_Node
(N
);
11367 if Present
(E
) then
11368 if Is_Global
(E
) then
11369 Set_Global_Type
(N
, N2
);
11371 elsif Nkind
(N
) = N_Op_Concat
11372 and then Is_Generic_Type
(Etype
(N2
))
11374 (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
11375 or else Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
11376 and then Is_Intrinsic_Subprogram
(E
)
11381 -- Entity is local. Mark generic node as unresolved.
11382 -- Note that now it does not have an entity.
11384 Set_Associated_Node
(N
, Empty
);
11385 Set_Etype
(N
, Empty
);
11388 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
11389 and then N
= Name
(Parent
(N
))
11391 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
11394 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11395 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
11397 if Is_Global
(Entity
(Parent
(N2
))) then
11398 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11399 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
11400 Set_Global_Type
(Parent
(N
), Parent
(N2
));
11401 Save_Entity_Descendants
(N
);
11403 -- If this is a reference to the current generic entity, replace
11404 -- by the name of the generic homonym of the current package. This
11405 -- is because in an instantiation Par.P.Q will not resolve to the
11406 -- name of the instance, whose enclosing scope is not necessarily
11407 -- Par. We use the generic homonym rather that the name of the
11408 -- generic itself, because it may be hidden by a local
11411 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
11413 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
11415 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
11416 Rewrite
(Parent
(N
),
11417 Make_Identifier
(Sloc
(N
),
11419 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
11421 Rewrite
(Parent
(N
),
11422 Make_Identifier
(Sloc
(N
),
11423 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
11427 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
11428 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
11430 Save_Global_Defaults
11431 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
11434 -- A selected component may denote a static constant that has been
11435 -- folded. If the static constant is global to the generic, capture
11436 -- its value. Otherwise the folding will happen in any instantiation,
11438 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11439 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
11441 if Present
(Entity
(Original_Node
(Parent
(N2
))))
11442 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
11444 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
11445 Set_Analyzed
(Parent
(N
), False);
11451 -- A selected component may be transformed into a parameterless
11452 -- function call. If the called entity is global, rewrite the node
11453 -- appropriately, i.e. as an extended name for the global entity.
11455 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11456 and then Nkind
(Parent
(N2
)) = N_Function_Call
11457 and then N
= Selector_Name
(Parent
(N
))
11459 if No
(Parameter_Associations
(Parent
(N2
))) then
11460 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
11461 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11462 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
11463 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
11464 Save_Entity_Descendants
(N
);
11467 Set_Associated_Node
(N
, Empty
);
11468 Set_Etype
(N
, Empty
);
11471 -- In Ada 2005, X.F may be a call to a primitive operation,
11472 -- rewritten as F (X). This rewriting will be done again in an
11473 -- instance, so keep the original node. Global entities will be
11474 -- captured as for other constructs.
11480 -- Entity is local. Reset in generic unit, so that node is resolved
11481 -- anew at the point of instantiation.
11484 Set_Associated_Node
(N
, Empty
);
11485 Set_Etype
(N
, Empty
);
11489 -----------------------------
11490 -- Save_Entity_Descendants --
11491 -----------------------------
11493 procedure Save_Entity_Descendants
(N
: Node_Id
) is
11496 when N_Binary_Op
=>
11497 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
11498 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11501 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11503 when N_Expanded_Name | N_Selected_Component
=>
11504 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
11505 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
11507 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
11511 raise Program_Error
;
11513 end Save_Entity_Descendants
;
11515 --------------------------
11516 -- Save_Global_Defaults --
11517 --------------------------
11519 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
11520 Loc
: constant Source_Ptr
:= Sloc
(N1
);
11521 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
11522 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
11529 Actual
: Entity_Id
;
11532 Assoc1
:= Generic_Associations
(N1
);
11534 if Present
(Assoc1
) then
11535 Act1
:= First
(Assoc1
);
11538 Set_Generic_Associations
(N1
, New_List
);
11539 Assoc1
:= Generic_Associations
(N1
);
11542 if Present
(Assoc2
) then
11543 Act2
:= First
(Assoc2
);
11548 while Present
(Act1
) and then Present
(Act2
) loop
11553 -- Find the associations added for default subprograms
11555 if Present
(Act2
) then
11556 while Nkind
(Act2
) /= N_Generic_Association
11557 or else No
(Entity
(Selector_Name
(Act2
)))
11558 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
11563 -- Add a similar association if the default is global. The
11564 -- renaming declaration for the actual has been analyzed, and
11565 -- its alias is the program it renames. Link the actual in the
11566 -- original generic tree with the node in the analyzed tree.
11568 while Present
(Act2
) loop
11569 Subp
:= Entity
(Selector_Name
(Act2
));
11570 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
11572 -- Following test is defence against rubbish errors
11574 if No
(Alias
(Subp
)) then
11578 -- Retrieve the resolved actual from the renaming declaration
11579 -- created for the instantiated formal.
11581 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
11582 Set_Entity
(Def
, Actual
);
11583 Set_Etype
(Def
, Etype
(Actual
));
11585 if Is_Global
(Actual
) then
11587 Make_Generic_Association
(Loc
,
11588 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11589 Explicit_Generic_Actual_Parameter
=>
11590 New_Occurrence_Of
(Actual
, Loc
));
11592 Set_Associated_Node
11593 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
11595 Append
(Ndec
, Assoc1
);
11597 -- If there are other defaults, add a dummy association in case
11598 -- there are other defaulted formals with the same name.
11600 elsif Present
(Next
(Act2
)) then
11602 Make_Generic_Association
(Loc
,
11603 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11604 Explicit_Generic_Actual_Parameter
=> Empty
);
11606 Append
(Ndec
, Assoc1
);
11613 if Nkind
(Name
(N1
)) = N_Identifier
11614 and then Is_Child_Unit
(Gen_Id
)
11615 and then Is_Global
(Gen_Id
)
11616 and then Is_Generic_Unit
(Scope
(Gen_Id
))
11617 and then In_Open_Scopes
(Scope
(Gen_Id
))
11619 -- This is an instantiation of a child unit within a sibling,
11620 -- so that the generic parent is in scope. An eventual instance
11621 -- must occur within the scope of an instance of the parent.
11622 -- Make name in instance into an expanded name, to preserve the
11623 -- identifier of the parent, so it can be resolved subsequently.
11625 Rewrite
(Name
(N2
),
11626 Make_Expanded_Name
(Loc
,
11627 Chars
=> Chars
(Gen_Id
),
11628 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11629 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11630 Set_Entity
(Name
(N2
), Gen_Id
);
11632 Rewrite
(Name
(N1
),
11633 Make_Expanded_Name
(Loc
,
11634 Chars
=> Chars
(Gen_Id
),
11635 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11636 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11638 Set_Associated_Node
(Name
(N1
), Name
(N2
));
11639 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
11640 Set_Associated_Node
11641 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
11642 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
11645 end Save_Global_Defaults
;
11647 ----------------------------
11648 -- Save_Global_Descendant --
11649 ----------------------------
11651 procedure Save_Global_Descendant
(D
: Union_Id
) is
11655 if D
in Node_Range
then
11656 if D
= Union_Id
(Empty
) then
11659 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
11660 Save_References
(Node_Id
(D
));
11663 elsif D
in List_Range
then
11664 if D
= Union_Id
(No_List
)
11665 or else Is_Empty_List
(List_Id
(D
))
11670 N1
:= First
(List_Id
(D
));
11671 while Present
(N1
) loop
11672 Save_References
(N1
);
11677 -- Element list or other non-node field, nothing to do
11682 end Save_Global_Descendant
;
11684 ---------------------
11685 -- Save_References --
11686 ---------------------
11688 -- This is the recursive procedure that does the work, once the
11689 -- enclosing generic scope has been established. We have to treat
11690 -- specially a number of node rewritings that are required by semantic
11691 -- processing and which change the kind of nodes in the generic copy:
11692 -- typically constant-folding, replacing an operator node by a string
11693 -- literal, or a selected component by an expanded name. In each of
11694 -- those cases, the transformation is propagated to the generic unit.
11696 procedure Save_References
(N
: Node_Id
) is
11701 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
11702 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11705 elsif Nkind
(N
) = N_Operator_Symbol
11706 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
11708 Change_Operator_Symbol_To_String_Literal
(N
);
11711 elsif Nkind
(N
) in N_Op
then
11712 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11713 if Nkind
(N
) = N_Op_Concat
then
11714 Set_Is_Component_Left_Opnd
(N
,
11715 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
11717 Set_Is_Component_Right_Opnd
(N
,
11718 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
11724 -- Node may be transformed into call to a user-defined operator
11726 N2
:= Get_Associated_Node
(N
);
11728 if Nkind
(N2
) = N_Function_Call
then
11729 E
:= Entity
(Name
(N2
));
11732 and then Is_Global
(E
)
11734 Set_Etype
(N
, Etype
(N2
));
11736 Set_Associated_Node
(N
, Empty
);
11737 Set_Etype
(N
, Empty
);
11740 elsif Nkind_In
(N2
, N_Integer_Literal
,
11744 if Present
(Original_Node
(N2
))
11745 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
11748 -- Operation was constant-folded. Whenever possible,
11749 -- recover semantic information from unfolded node,
11752 Set_Associated_Node
(N
, Original_Node
(N2
));
11754 if Nkind
(N
) = N_Op_Concat
then
11755 Set_Is_Component_Left_Opnd
(N
,
11756 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
11757 Set_Is_Component_Right_Opnd
(N
,
11758 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
11764 -- If original node is already modified, propagate
11765 -- constant-folding to template.
11767 Rewrite
(N
, New_Copy
(N2
));
11768 Set_Analyzed
(N
, False);
11771 elsif Nkind
(N2
) = N_Identifier
11772 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
11774 -- Same if call was folded into a literal, but in this case
11775 -- retain the entity to avoid spurious ambiguities if id is
11776 -- overloaded at the point of instantiation or inlining.
11778 Rewrite
(N
, New_Copy
(N2
));
11779 Set_Analyzed
(N
, False);
11783 -- Complete operands check if node has not been constant-folded
11785 if Nkind
(N
) in N_Op
then
11786 Save_Entity_Descendants
(N
);
11789 elsif Nkind
(N
) = N_Identifier
then
11790 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
11792 -- If this is a discriminant reference, always save it. It is
11793 -- used in the instance to find the corresponding discriminant
11794 -- positionally rather than by name.
11796 Set_Original_Discriminant
11797 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
11801 N2
:= Get_Associated_Node
(N
);
11803 if Nkind
(N2
) = N_Function_Call
then
11804 E
:= Entity
(Name
(N2
));
11806 -- Name resolves to a call to parameterless function. If
11807 -- original entity is global, mark node as resolved.
11810 and then Is_Global
(E
)
11812 Set_Etype
(N
, Etype
(N2
));
11814 Set_Associated_Node
(N
, Empty
);
11815 Set_Etype
(N
, Empty
);
11818 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
11819 and then Is_Entity_Name
(Original_Node
(N2
))
11821 -- Name resolves to named number that is constant-folded,
11822 -- We must preserve the original name for ASIS use, and
11823 -- undo the constant-folding, which will be repeated in
11826 Set_Associated_Node
(N
, Original_Node
(N2
));
11829 elsif Nkind
(N2
) = N_String_Literal
then
11831 -- Name resolves to string literal. Perform the same
11832 -- replacement in generic.
11834 Rewrite
(N
, New_Copy
(N2
));
11836 elsif Nkind
(N2
) = N_Explicit_Dereference
then
11838 -- An identifier is rewritten as a dereference if it is
11839 -- the prefix in a selected component, and it denotes an
11840 -- access to a composite type, or a parameterless function
11841 -- call that returns an access type.
11843 -- Check whether corresponding entity in prefix is global
11845 if Is_Entity_Name
(Prefix
(N2
))
11846 and then Present
(Entity
(Prefix
(N2
)))
11847 and then Is_Global
(Entity
(Prefix
(N2
)))
11850 Make_Explicit_Dereference
(Sloc
(N
),
11851 Prefix
=> Make_Identifier
(Sloc
(N
),
11852 Chars
=> Chars
(N
))));
11853 Set_Associated_Node
(Prefix
(N
), Prefix
(N2
));
11855 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
11856 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
11859 Make_Explicit_Dereference
(Sloc
(N
),
11860 Prefix
=> Make_Function_Call
(Sloc
(N
),
11862 Make_Identifier
(Sloc
(N
),
11863 Chars
=> Chars
(N
)))));
11865 Set_Associated_Node
11866 (Name
(Prefix
(N
)), Name
(Prefix
(N2
)));
11869 Set_Associated_Node
(N
, Empty
);
11870 Set_Etype
(N
, Empty
);
11873 -- The subtype mark of a nominally unconstrained object is
11874 -- rewritten as a subtype indication using the bounds of the
11875 -- expression. Recover the original subtype mark.
11877 elsif Nkind
(N2
) = N_Subtype_Indication
11878 and then Is_Entity_Name
(Original_Node
(N2
))
11880 Set_Associated_Node
(N
, Original_Node
(N2
));
11888 elsif Nkind
(N
) in N_Entity
then
11893 Loc
: constant Source_Ptr
:= Sloc
(N
);
11894 Qual
: Node_Id
:= Empty
;
11895 Typ
: Entity_Id
:= Empty
;
11898 use Atree
.Unchecked_Access
;
11899 -- This code section is part of implementing an untyped tree
11900 -- traversal, so it needs direct access to node fields.
11903 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
11904 N2
:= Get_Associated_Node
(N
);
11911 -- In an instance within a generic, use the name of the
11912 -- actual and not the original generic parameter. If the
11913 -- actual is global in the current generic it must be
11914 -- preserved for its instantiation.
11916 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
11918 Present
(Generic_Parent_Type
(Parent
(Typ
)))
11920 Typ
:= Base_Type
(Typ
);
11921 Set_Etype
(N2
, Typ
);
11927 or else not Is_Global
(Typ
)
11929 Set_Associated_Node
(N
, Empty
);
11931 -- If the aggregate is an actual in a call, it has been
11932 -- resolved in the current context, to some local type.
11933 -- The enclosing call may have been disambiguated by the
11934 -- aggregate, and this disambiguation might fail at
11935 -- instantiation time because the type to which the
11936 -- aggregate did resolve is not preserved. In order to
11937 -- preserve some of this information, we wrap the
11938 -- aggregate in a qualified expression, using the id of
11939 -- its type. For further disambiguation we qualify the
11940 -- type name with its scope (if visible) because both
11941 -- id's will have corresponding entities in an instance.
11942 -- This resolves most of the problems with missing type
11943 -- information on aggregates in instances.
11945 if Nkind
(N2
) = Nkind
(N
)
11947 Nkind_In
(Parent
(N2
), N_Procedure_Call_Statement
,
11949 and then Comes_From_Source
(Typ
)
11951 if Is_Immediately_Visible
(Scope
(Typ
)) then
11952 Nam
:= Make_Selected_Component
(Loc
,
11954 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
11956 Make_Identifier
(Loc
, Chars
(Typ
)));
11958 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
11962 Make_Qualified_Expression
(Loc
,
11963 Subtype_Mark
=> Nam
,
11964 Expression
=> Relocate_Node
(N
));
11968 Save_Global_Descendant
(Field1
(N
));
11969 Save_Global_Descendant
(Field2
(N
));
11970 Save_Global_Descendant
(Field3
(N
));
11971 Save_Global_Descendant
(Field5
(N
));
11973 if Present
(Qual
) then
11977 -- All other cases than aggregates
11980 Save_Global_Descendant
(Field1
(N
));
11981 Save_Global_Descendant
(Field2
(N
));
11982 Save_Global_Descendant
(Field3
(N
));
11983 Save_Global_Descendant
(Field4
(N
));
11984 Save_Global_Descendant
(Field5
(N
));
11988 end Save_References
;
11990 -- Start of processing for Save_Global_References
11993 Gen_Scope
:= Current_Scope
;
11995 -- If the generic unit is a child unit, references to entities in the
11996 -- parent are treated as local, because they will be resolved anew in
11997 -- the context of the instance of the parent.
11999 while Is_Child_Unit
(Gen_Scope
)
12000 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
12002 Gen_Scope
:= Scope
(Gen_Scope
);
12005 Save_References
(N
);
12006 end Save_Global_References
;
12008 --------------------------------------
12009 -- Set_Copied_Sloc_For_Inlined_Body --
12010 --------------------------------------
12012 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
12014 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
12015 end Set_Copied_Sloc_For_Inlined_Body
;
12017 ---------------------
12018 -- Set_Instance_Of --
12019 ---------------------
12021 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
12023 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
12024 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
12025 Generic_Renamings
.Increment_Last
;
12026 end Set_Instance_Of
;
12028 --------------------
12029 -- Set_Next_Assoc --
12030 --------------------
12032 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
12034 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
12035 end Set_Next_Assoc
;
12037 -------------------
12038 -- Start_Generic --
12039 -------------------
12041 procedure Start_Generic
is
12043 -- ??? More things could be factored out in this routine.
12044 -- Should probably be done at a later stage.
12046 Generic_Flags
.Append
(Inside_A_Generic
);
12047 Inside_A_Generic
:= True;
12049 Expander_Mode_Save_And_Set
(False);
12052 ----------------------
12053 -- Set_Instance_Env --
12054 ----------------------
12056 procedure Set_Instance_Env
12057 (Gen_Unit
: Entity_Id
;
12058 Act_Unit
: Entity_Id
)
12061 -- Regardless of the current mode, predefined units are analyzed in
12062 -- the most current Ada mode, and earlier version Ada checks do not
12063 -- apply to predefined units. Nothing needs to be done for non-internal
12064 -- units. These are always analyzed in the current mode.
12066 if Is_Internal_File_Name
12067 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
12068 Renamings_Included
=> True)
12070 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
12073 Current_Instantiated_Parent
:= (Gen_Unit
, Act_Unit
, Assoc_Null
);
12074 end Set_Instance_Env
;
12080 procedure Switch_View
(T
: Entity_Id
) is
12081 BT
: constant Entity_Id
:= Base_Type
(T
);
12082 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
12083 Priv_Sub
: Entity_Id
;
12086 -- T may be private but its base type may have been exchanged through
12087 -- some other occurrence, in which case there is nothing to switch
12088 -- besides T itself. Note that a private dependent subtype of a private
12089 -- type might not have been switched even if the base type has been,
12090 -- because of the last branch of Check_Private_View (see comment there).
12092 if not Is_Private_Type
(BT
) then
12093 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
12094 Exchange_Declarations
(T
);
12098 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
12100 if Present
(Full_View
(BT
)) then
12101 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
12102 Exchange_Declarations
(BT
);
12105 while Present
(Priv_Elmt
) loop
12106 Priv_Sub
:= (Node
(Priv_Elmt
));
12108 -- We avoid flipping the subtype if the Etype of its full view is
12109 -- private because this would result in a malformed subtype. This
12110 -- occurs when the Etype of the subtype full view is the full view of
12111 -- the base type (and since the base types were just switched, the
12112 -- subtype is pointing to the wrong view). This is currently the case
12113 -- for tagged record types, access types (maybe more?) and needs to
12114 -- be resolved. ???
12116 if Present
(Full_View
(Priv_Sub
))
12117 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
12119 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
12120 Exchange_Declarations
(Priv_Sub
);
12123 Next_Elmt
(Priv_Elmt
);
12127 -----------------------------
12128 -- Valid_Default_Attribute --
12129 -----------------------------
12131 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
12132 Attr_Id
: constant Attribute_Id
:=
12133 Get_Attribute_Id
(Attribute_Name
(Def
));
12134 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
12135 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
12148 F
:= First_Formal
(Nam
);
12149 while Present
(F
) loop
12150 Num_F
:= Num_F
+ 1;
12155 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12156 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12157 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12158 Attribute_Unbiased_Rounding
=>
12161 and then Is_Floating_Point_Type
(T
);
12163 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12164 Attribute_Value | Attribute_Wide_Image |
12165 Attribute_Wide_Value
=>
12166 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
12168 when Attribute_Max | Attribute_Min
=>
12169 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
12171 when Attribute_Input
=>
12172 OK
:= (Is_Fun
and then Num_F
= 1);
12174 when Attribute_Output | Attribute_Read | Attribute_Write
=>
12175 OK
:= (not Is_Fun
and then Num_F
= 2);
12182 Error_Msg_N
("attribute reference has wrong profile for subprogram",
12185 end Valid_Default_Attribute
;