1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
37 with Lib.Load; use Lib.Load;
38 with Lib.Xref; use Lib.Xref;
39 with Nlists; use Nlists;
40 with Namet; use Namet;
41 with Nmake; use Nmake;
43 with Rident; use Rident;
44 with Restrict; use Restrict;
45 with Rtsfind; use Rtsfind;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Ch10; use Sem_Ch10;
53 with Sem_Ch13; use Sem_Ch13;
54 with Sem_Disp; use Sem_Disp;
55 with Sem_Elab; use Sem_Elab;
56 with Sem_Elim; use Sem_Elim;
57 with Sem_Eval; use Sem_Eval;
58 with Sem_Res; use Sem_Res;
59 with Sem_Type; use Sem_Type;
60 with Sem_Util; use Sem_Util;
61 with Sem_Warn; use Sem_Warn;
62 with Stand; use Stand;
63 with Sinfo; use Sinfo;
64 with Sinfo.CN; use Sinfo.CN;
65 with Sinput; use Sinput;
66 with Sinput.L; use Sinput.L;
67 with Snames; use Snames;
68 with Stringt; use Stringt;
69 with Uname; use Uname;
71 with Tbuild; use Tbuild;
72 with Uintp; use Uintp;
73 with Urealp; use Urealp;
77 package body Sem_Ch12 is
79 ----------------------------------------------------------
80 -- Implementation of Generic Analysis and Instantiation --
81 ----------------------------------------------------------
83 -- GNAT implements generics by macro expansion. No attempt is made to share
84 -- generic instantiations (for now). Analysis of a generic definition does
85 -- not perform any expansion action, but the expander must be called on the
86 -- tree for each instantiation, because the expansion may of course depend
87 -- on the generic actuals. All of this is best achieved as follows:
89 -- a) Semantic analysis of a generic unit is performed on a copy of the
90 -- tree for the generic unit. All tree modifications that follow analysis
91 -- do not affect the original tree. Links are kept between the original
92 -- tree and the copy, in order to recognize non-local references within
93 -- the generic, and propagate them to each instance (recall that name
94 -- resolution is done on the generic declaration: generics are not really
95 -- macros!). This is summarized in the following diagram:
97 -- .-----------. .----------.
98 -- | semantic |<--------------| generic |
100 -- | |==============>| |
101 -- |___________| global |__________|
112 -- b) Each instantiation copies the original tree, and inserts into it a
113 -- series of declarations that describe the mapping between generic formals
114 -- and actuals. For example, a generic In OUT parameter is an object
115 -- renaming of the corresponing actual, etc. Generic IN parameters are
116 -- constant declarations.
118 -- c) In order to give the right visibility for these renamings, we use
119 -- a different scheme for package and subprogram instantiations. For
120 -- packages, the list of renamings is inserted into the package
121 -- specification, before the visible declarations of the package. The
122 -- renamings are analyzed before any of the text of the instance, and are
123 -- thus visible at the right place. Furthermore, outside of the instance,
124 -- the generic parameters are visible and denote their corresponding
127 -- For subprograms, we create a container package to hold the renamings
128 -- and the subprogram instance itself. Analysis of the package makes the
129 -- renaming declarations visible to the subprogram. After analyzing the
130 -- package, the defining entity for the subprogram is touched-up so that
131 -- it appears declared in the current scope, and not inside the container
134 -- If the instantiation is a compilation unit, the container package is
135 -- given the same name as the subprogram instance. This ensures that
136 -- the elaboration procedure called by the binder, using the compilation
137 -- unit name, calls in fact the elaboration procedure for the package.
139 -- Not surprisingly, private types complicate this approach. By saving in
140 -- the original generic object the non-local references, we guarantee that
141 -- the proper entities are referenced at the point of instantiation.
142 -- However, for private types, this by itself does not insure that the
143 -- proper VIEW of the entity is used (the full type may be visible at the
144 -- point of generic definition, but not at instantiation, or vice-versa).
145 -- In order to reference the proper view, we special-case any reference
146 -- to private types in the generic object, by saving both views, one in
147 -- the generic and one in the semantic copy. At time of instantiation, we
148 -- check whether the two views are consistent, and exchange declarations if
149 -- necessary, in order to restore the correct visibility. Similarly, if
150 -- the instance view is private when the generic view was not, we perform
151 -- the exchange. After completing the instantiation, we restore the
152 -- current visibility. The flag Has_Private_View marks identifiers in the
153 -- the generic unit that require checking.
155 -- Visibility within nested generic units requires special handling.
156 -- Consider the following scheme:
158 -- type Global is ... -- outside of generic unit.
162 -- type Semi_Global is ... -- global to inner.
165 -- procedure inner (X1 : Global; X2 : Semi_Global);
167 -- procedure in2 is new inner (...); -- 4
170 -- package New_Outer is new Outer (...); -- 2
171 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
173 -- The semantic analysis of Outer captures all occurrences of Global.
174 -- The semantic analysis of Inner (at 1) captures both occurrences of
175 -- Global and Semi_Global.
177 -- At point 2 (instantiation of Outer), we also produce a generic copy
178 -- of Inner, even though Inner is, at that point, not being instantiated.
179 -- (This is just part of the semantic analysis of New_Outer).
181 -- Critically, references to Global within Inner must be preserved, while
182 -- references to Semi_Global should not preserved, because they must now
183 -- resolve to an entity within New_Outer. To distinguish between these, we
184 -- use a global variable, Current_Instantiated_Parent, which is set when
185 -- performing a generic copy during instantiation (at 2). This variable is
186 -- used when performing a generic copy that is not an instantiation, but
187 -- that is nested within one, as the occurrence of 1 within 2. The analysis
188 -- of a nested generic only preserves references that are global to the
189 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
190 -- determine whether a reference is external to the given parent.
192 -- The instantiation at point 3 requires no special treatment. The method
193 -- works as well for further nestings of generic units, but of course the
194 -- variable Current_Instantiated_Parent must be stacked because nested
195 -- instantiations can occur, e.g. the occurrence of 4 within 2.
197 -- The instantiation of package and subprogram bodies is handled in a
198 -- similar manner, except that it is delayed until after semantic
199 -- analysis is complete. In this fashion complex cross-dependencies
200 -- between several package declarations and bodies containing generics
201 -- can be compiled which otherwise would diagnose spurious circularities.
203 -- For example, it is possible to compile two packages A and B that
204 -- have the following structure:
206 -- package A is package B is
207 -- generic ... generic ...
208 -- package G_A is package G_B is
211 -- package body A is package body B is
212 -- package N_B is new G_B (..) package N_A is new G_A (..)
214 -- The table Pending_Instantiations in package Inline is used to keep
215 -- track of body instantiations that are delayed in this manner. Inline
216 -- handles the actual calls to do the body instantiations. This activity
217 -- is part of Inline, since the processing occurs at the same point, and
218 -- for essentially the same reason, as the handling of inlined routines.
220 ----------------------------------------------
221 -- Detection of Instantiation Circularities --
222 ----------------------------------------------
224 -- If we have a chain of instantiations that is circular, this is static
225 -- error which must be detected at compile time. The detection of these
226 -- circularities is carried out at the point that we insert a generic
227 -- instance spec or body. If there is a circularity, then the analysis of
228 -- the offending spec or body will eventually result in trying to load the
229 -- same unit again, and we detect this problem as we analyze the package
230 -- instantiation for the second time.
232 -- At least in some cases after we have detected the circularity, we get
233 -- into trouble if we try to keep going. The following flag is set if a
234 -- circularity is detected, and used to abandon compilation after the
235 -- messages have been posted.
237 Circularity_Detected : Boolean := False;
238 -- This should really be reset on encountering a new main unit, but in
239 -- practice we are not using multiple main units so it is not critical.
241 -------------------------------------------------
242 -- Formal packages and partial parametrization --
243 -------------------------------------------------
245 -- When compiling a generic, a formal package is a local instantiation. If
246 -- declared with a box, its generic formals are visible in the enclosing
247 -- generic. If declared with a partial list of actuals, those actuals that
248 -- are defaulted (covered by an Others clause, or given an explicit box
249 -- initialization) are also visible in the enclosing generic, while those
250 -- that have a corresponding actual are not.
252 -- In our source model of instantiation, the same visibility must be
253 -- present in the spec and body of an instance: the names of the formals
254 -- that are defaulted must be made visible within the instance, and made
255 -- invisible (hidden) after the instantiation is complete, so that they
256 -- are not accessible outside of the instance.
258 -- In a generic, a formal package is treated like a special instantiation.
259 -- Our Ada95 compiler handled formals with and without box in different
260 -- ways. With partial parametrization, we use a single model for both.
261 -- We create a package declaration that consists of the specification of
262 -- the generic package, and a set of declarations that map the actuals
263 -- into local renamings, just as we do for bona fide instantiations. For
264 -- defaulted parameters and formals with a box, we copy directly the
265 -- declarations of the formal into this local package. The result is a
266 -- a package whose visible declarations may include generic formals. This
267 -- package is only used for type checking and visibility analysis, and
268 -- never reaches the back-end, so it can freely violate the placement
269 -- rules for generic formal declarations.
271 -- The list of declarations (renamings and copies of formals) is built
272 -- by Analyze_Associations, just as for regular instantiations.
274 -- At the point of instantiation, conformance checking must be applied only
275 -- to those parameters that were specified in the formal. We perform this
276 -- checking by creating another internal instantiation, this one including
277 -- only the renamings and the formals (the rest of the package spec is not
278 -- relevant to conformance checking). We can then traverse two lists: the
279 -- list of actuals in the instance that corresponds to the formal package,
280 -- and the list of actuals produced for this bogus instantiation. We apply
281 -- the conformance rules to those actuals that are not defaulted (i.e.
282 -- which still appear as generic formals.
284 -- When we compile an instance body we must make the right parameters
285 -- visible again. The predicate Is_Generic_Formal indicates which of the
286 -- formals should have its Is_Hidden flag reset.
288 -----------------------
289 -- Local subprograms --
290 -----------------------
292 procedure Abandon_Instantiation (N : Node_Id);
293 pragma No_Return (Abandon_Instantiation);
294 -- Posts an error message "instantiation abandoned" at the indicated node
295 -- and then raises the exception Instantiation_Error to do it.
297 procedure Analyze_Formal_Array_Type
298 (T : in out Entity_Id;
300 -- A formal array type is treated like an array type declaration, and
301 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
302 -- in-out, because in the case of an anonymous type the entity is
303 -- actually created in the procedure.
305 -- The following procedures treat other kinds of formal parameters
307 procedure Analyze_Formal_Derived_Interface_Type
312 procedure Analyze_Formal_Derived_Type
317 procedure Analyze_Formal_Interface_Type
322 -- The following subprograms create abbreviated declarations for formal
323 -- scalar types. We introduce an anonymous base of the proper class for
324 -- each of them, and define the formals as constrained first subtypes of
325 -- their bases. The bounds are expressions that are non-static in the
328 procedure Analyze_Formal_Decimal_Fixed_Point_Type
329 (T : Entity_Id; Def : Node_Id);
330 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
331 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
332 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
333 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
334 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
335 (T : Entity_Id; Def : Node_Id);
337 procedure Analyze_Formal_Private_Type
341 -- Creates a new private type, which does not require completion
343 procedure Analyze_Generic_Formal_Part (N : Node_Id);
345 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
346 -- Create a new access type with the given designated type
348 function Analyze_Associations
351 F_Copy : List_Id) return List_Id;
352 -- At instantiation time, build the list of associations between formals
353 -- and actuals. Each association becomes a renaming declaration for the
354 -- formal entity. F_Copy is the analyzed list of formals in the generic
355 -- copy. It is used to apply legality checks to the actuals. I_Node is the
356 -- instantiation node itself.
358 procedure Analyze_Subprogram_Instantiation
362 procedure Build_Instance_Compilation_Unit_Nodes
366 -- This procedure is used in the case where the generic instance of a
367 -- subprogram body or package body is a library unit. In this case, the
368 -- original library unit node for the generic instantiation must be
369 -- replaced by the resulting generic body, and a link made to a new
370 -- compilation unit node for the generic declaration. The argument N is
371 -- the original generic instantiation. Act_Body and Act_Decl are the body
372 -- and declaration of the instance (either package body and declaration
373 -- nodes or subprogram body and declaration nodes depending on the case).
374 -- On return, the node N has been rewritten with the actual body.
376 procedure Check_Access_Definition (N : Node_Id);
377 -- Subsidiary routine to null exclusion processing. Perform an assertion
378 -- check on Ada version and the presence of an access definition in N.
380 procedure Check_Formal_Packages (P_Id : Entity_Id);
381 -- Apply the following to all formal packages in generic associations
383 procedure Check_Formal_Package_Instance
384 (Formal_Pack : Entity_Id;
385 Actual_Pack : Entity_Id);
386 -- Verify that the actuals of the actual instance match the actuals of
387 -- the template for a formal package that is not declared with a box.
389 procedure Check_Forward_Instantiation (Decl : Node_Id);
390 -- If the generic is a local entity and the corresponding body has not
391 -- been seen yet, flag enclosing packages to indicate that it will be
392 -- elaborated after the generic body. Subprograms declared in the same
393 -- package cannot be inlined by the front-end because front-end inlining
394 -- requires a strict linear order of elaboration.
396 procedure Check_Hidden_Child_Unit
398 Gen_Unit : Entity_Id;
399 Act_Decl_Id : Entity_Id);
400 -- If the generic unit is an implicit child instance within a parent
401 -- instance, we need to make an explicit test that it is not hidden by
402 -- a child instance of the same name and parent.
404 procedure Check_Generic_Actuals
405 (Instance : Entity_Id;
406 Is_Formal_Box : Boolean);
407 -- Similar to previous one. Check the actuals in the instantiation,
408 -- whose views can change between the point of instantiation and the point
409 -- of instantiation of the body. In addition, mark the generic renamings
410 -- as generic actuals, so that they are not compatible with other actuals.
411 -- Recurse on an actual that is a formal package whose declaration has
414 function Contains_Instance_Of
417 N : Node_Id) return Boolean;
418 -- Inner is instantiated within the generic Outer. Check whether Inner
419 -- directly or indirectly contains an instance of Outer or of one of its
420 -- parents, in the case of a subunit. Each generic unit holds a list of
421 -- the entities instantiated within (at any depth). This procedure
422 -- determines whether the set of such lists contains a cycle, i.e. an
423 -- illegal circular instantiation.
425 function Denotes_Formal_Package
427 On_Exit : Boolean := False) return Boolean;
428 -- Returns True if E is a formal package of an enclosing generic, or
429 -- the actual for such a formal in an enclosing instantiation. If such
430 -- a package is used as a formal in an nested generic, or as an actual
431 -- in a nested instantiation, the visibility of ITS formals should not
432 -- be modified. When called from within Restore_Private_Views, the flag
433 -- On_Exit is true, to indicate that the search for a possible enclosing
434 -- instance should ignore the current one.
436 function Find_Actual_Type
438 Gen_Scope : Entity_Id) return Entity_Id;
439 -- When validating the actual types of a child instance, check whether
440 -- the formal is a formal type of the parent unit, and retrieve the current
441 -- actual for it. Typ is the entity in the analyzed formal type declaration
442 -- (component or index type of an array type, or designated type of an
443 -- access formal) and Gen_Scope is the scope of the analyzed formal array
444 -- or access type. The desired actual may be a formal of a parent, or may
445 -- be declared in a formal package of a parent. In both cases it is a
446 -- generic actual type because it appears within a visible instance.
447 -- Ambiguities may still arise if two homonyms are declared in two formal
448 -- packages, and the prefix of the formal type may be needed to resolve
449 -- the ambiguity in the instance ???
451 function In_Same_Declarative_Part
453 Inst : Node_Id) return Boolean;
454 -- True if the instantiation Inst and the given freeze_node F_Node appear
455 -- within the same declarative part, ignoring subunits, but with no inter-
456 -- vening suprograms or concurrent units. If true, the freeze node
457 -- of the instance can be placed after the freeze node of the parent,
458 -- which it itself an instance.
460 function In_Main_Context (E : Entity_Id) return Boolean;
461 -- Check whether an instantiation is in the context of the main unit.
462 -- Used to determine whether its body should be elaborated to allow
463 -- front-end inlining.
465 function Is_Generic_Formal (E : Entity_Id) return Boolean;
466 -- Utility to determine whether a given entity is declared by means of
467 -- of a formal parameter declaration. Used to set properly the visiblity
468 -- of generic formals of a generic package declared with a box or with
469 -- partial parametrization.
471 procedure Set_Instance_Env
472 (Gen_Unit : Entity_Id;
473 Act_Unit : Entity_Id);
474 -- Save current instance on saved environment, to be used to determine
475 -- the global status of entities in nested instances. Part of Save_Env.
476 -- called after verifying that the generic unit is legal for the instance,
477 -- The procedure also examines whether the generic unit is a predefined
478 -- unit, in order to set configuration switches accordingly. As a result
479 -- the procedure must be called after analyzing and freezing the actuals.
481 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
482 -- Associate analyzed generic parameter with corresponding
483 -- instance. Used for semantic checks at instantiation time.
485 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
486 -- Traverse the Exchanged_Views list to see if a type was private
487 -- and has already been flipped during this phase of instantiation.
489 procedure Hide_Current_Scope;
490 -- When compiling a generic child unit, the parent context must be
491 -- present, but the instance and all entities that may be generated
492 -- must be inserted in the current scope. We leave the current scope
493 -- on the stack, but make its entities invisible to avoid visibility
494 -- problems. This is reversed at the end of instantiations. This is
495 -- not done for the instantiation of the bodies, which only require the
496 -- instances of the generic parents to be in scope.
498 procedure Install_Body
503 -- If the instantiation happens textually before the body of the generic,
504 -- the instantiation of the body must be analyzed after the generic body,
505 -- and not at the point of instantiation. Such early instantiations can
506 -- happen if the generic and the instance appear in a package declaration
507 -- because the generic body can only appear in the corresponding package
508 -- body. Early instantiations can also appear if generic, instance and
509 -- body are all in the declarative part of a subprogram or entry. Entities
510 -- of packages that are early instantiations are delayed, and their freeze
511 -- node appears after the generic body.
513 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
514 -- Insert freeze node at the end of the declarative part that includes the
515 -- instance node N. If N is in the visible part of an enclosing package
516 -- declaration, the freeze node has to be inserted at the end of the
517 -- private declarations, if any.
519 procedure Freeze_Subprogram_Body
520 (Inst_Node : Node_Id;
522 Pack_Id : Entity_Id);
523 -- The generic body may appear textually after the instance, including
524 -- in the proper body of a stub, or within a different package instance.
525 -- Given that the instance can only be elaborated after the generic, we
526 -- place freeze_nodes for the instance and/or for packages that may enclose
527 -- the instance and the generic, so that the back-end can establish the
528 -- proper order of elaboration.
531 -- Establish environment for subsequent instantiation. Separated from
532 -- Save_Env because data-structures for visibility handling must be
533 -- initialized before call to Check_Generic_Child_Unit.
535 procedure Install_Formal_Packages (Par : Entity_Id);
536 -- If any of the formals of the parent are formal packages with box,
537 -- their formal parts are visible in the parent and thus in the child
538 -- unit as well. Analogous to what is done in Check_Generic_Actuals
539 -- for the unit itself. This procedure is also used in an instance, to
540 -- make visible the proper entities of the actual for a formal package
541 -- declared with a box.
543 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
544 -- When compiling an instance of a child unit the parent (which is
545 -- itself an instance) is an enclosing scope that must be made
546 -- immediately visible. This procedure is also used to install the non-
547 -- generic parent of a generic child unit when compiling its body, so
548 -- that full views of types in the parent are made visible.
550 procedure Remove_Parent (In_Body : Boolean := False);
551 -- Reverse effect after instantiation of child is complete
553 procedure Inline_Instance_Body
555 Gen_Unit : Entity_Id;
557 -- If front-end inlining is requested, instantiate the package body,
558 -- and preserve the visibility of its compilation unit, to insure
559 -- that successive instantiations succeed.
561 -- The functions Instantiate_XXX perform various legality checks and build
562 -- the declarations for instantiated generic parameters. In all of these
563 -- Formal is the entity in the generic unit, Actual is the entity of
564 -- expression in the generic associations, and Analyzed_Formal is the
565 -- formal in the generic copy, which contains the semantic information to
566 -- be used to validate the actual.
568 function Instantiate_Object
571 Analyzed_Formal : Node_Id) return List_Id;
573 function Instantiate_Type
576 Analyzed_Formal : Node_Id;
577 Actual_Decls : List_Id) return List_Id;
579 function Instantiate_Formal_Subprogram
582 Analyzed_Formal : Node_Id) return Node_Id;
584 function Instantiate_Formal_Package
587 Analyzed_Formal : Node_Id) return List_Id;
588 -- If the formal package is declared with a box, special visibility rules
589 -- apply to its formals: they are in the visible part of the package. This
590 -- is true in the declarative region of the formal package, that is to say
591 -- in the enclosing generic or instantiation. For an instantiation, the
592 -- parameters of the formal package are made visible in an explicit step.
593 -- Furthermore, if the actual is a visible use_clause, these formals must
594 -- be made potentially use_visible as well. On exit from the enclosing
595 -- instantiation, the reverse must be done.
597 -- For a formal package declared without a box, there are conformance rules
598 -- that apply to the actuals in the generic declaration and the actuals of
599 -- the actual package in the enclosing instantiation. The simplest way to
600 -- apply these rules is to repeat the instantiation of the formal package
601 -- in the context of the enclosing instance, and compare the generic
602 -- associations of this instantiation with those of the actual package.
603 -- This internal instantiation only needs to contain the renamings of the
604 -- formals: the visible and private declarations themselves need not be
607 -- In Ada2005, the formal package may be only partially parametrized. In
608 -- that case the visibility step must make visible those actuals whose
609 -- corresponding formals were given with a box. A final complication
610 -- involves inherited operations from formal derived types, which must be
611 -- visible if the type is.
613 function Is_In_Main_Unit (N : Node_Id) return Boolean;
614 -- Test if given node is in the main unit
616 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
617 -- If the generic appears in a separate non-generic library unit,
618 -- load the corresponding body to retrieve the body of the generic.
619 -- N is the node for the generic instantiation, Spec is the generic
620 -- package declaration.
622 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
623 -- Add the context clause of the unit containing a generic unit to
624 -- an instantiation that is a compilation unit.
626 function Get_Associated_Node (N : Node_Id) return Node_Id;
627 -- In order to propagate semantic information back from the analyzed
628 -- copy to the original generic, we maintain links between selected nodes
629 -- in the generic and their corresponding copies. At the end of generic
630 -- analysis, the routine Save_Global_References traverses the generic
631 -- tree, examines the semantic information, and preserves the links to
632 -- those nodes that contain global information. At instantiation, the
633 -- information from the associated node is placed on the new copy, so
634 -- that name resolution is not repeated.
636 -- Three kinds of source nodes have associated nodes:
638 -- a) those that can reference (denote) entities, that is identifiers,
639 -- character literals, expanded_names, operator symbols, operators,
640 -- and attribute reference nodes. These nodes have an Entity field
641 -- and are the set of nodes that are in N_Has_Entity.
643 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
645 -- c) selected components (N_Selected_Component)
647 -- For the first class, the associated node preserves the entity if it is
648 -- global. If the generic contains nested instantiations, the associated
649 -- node itself has been recopied, and a chain of them must be followed.
651 -- For aggregates, the associated node allows retrieval of the type, which
652 -- may otherwise not appear in the generic. The view of this type may be
653 -- different between generic and instantiation, and the full view can be
654 -- installed before the instantiation is analyzed. For aggregates of
655 -- type extensions, the same view exchange may have to be performed for
656 -- some of the ancestor types, if their view is private at the point of
659 -- Nodes that are selected components in the parse tree may be rewritten
660 -- as expanded names after resolution, and must be treated as potential
661 -- entity holders. which is why they also have an Associated_Node.
663 -- Nodes that do not come from source, such as freeze nodes, do not appear
664 -- in the generic tree, and need not have an associated node.
666 -- The associated node is stored in the Associated_Node field. Note that
667 -- this field overlaps Entity, which is fine, because the whole point is
668 -- that we don't need or want the normal Entity field in this situation.
670 procedure Move_Freeze_Nodes
674 -- Freeze nodes can be generated in the analysis of a generic unit, but
675 -- will not be seen by the back-end. It is necessary to move those nodes
676 -- to the enclosing scope if they freeze an outer entity. We place them
677 -- at the end of the enclosing generic package, which is semantically
680 procedure Pre_Analyze_Actuals (N : Node_Id);
681 -- Analyze actuals to perform name resolution. Full resolution is done
682 -- later, when the expected types are known, but names have to be captured
683 -- before installing parents of generics, that are not visible for the
684 -- actuals themselves.
686 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
687 -- Verify that an attribute that appears as the default for a formal
688 -- subprogram is a function or procedure with the correct profile.
690 -------------------------------------------
691 -- Data Structures for Generic Renamings --
692 -------------------------------------------
694 -- The map Generic_Renamings associates generic entities with their
695 -- corresponding actuals. Currently used to validate type instances.
696 -- It will eventually be used for all generic parameters to eliminate
697 -- the need for overload resolution in the instance.
699 type Assoc_Ptr is new Int;
701 Assoc_Null : constant Assoc_Ptr := -1;
706 Next_In_HTable : Assoc_Ptr;
709 package Generic_Renamings is new Table.Table
710 (Table_Component_Type => Assoc,
711 Table_Index_Type => Assoc_Ptr,
712 Table_Low_Bound => 0,
714 Table_Increment => 100,
715 Table_Name => "Generic_Renamings");
717 -- Variable to hold enclosing instantiation. When the environment is
718 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
720 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
722 -- Hash table for associations
724 HTable_Size : constant := 37;
725 type HTable_Range is range 0 .. HTable_Size - 1;
727 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
728 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
729 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
730 function Hash (F : Entity_Id) return HTable_Range;
732 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
733 Header_Num => HTable_Range,
735 Elmt_Ptr => Assoc_Ptr,
736 Null_Ptr => Assoc_Null,
737 Set_Next => Set_Next_Assoc,
740 Get_Key => Get_Gen_Id,
744 Exchanged_Views : Elist_Id;
745 -- This list holds the private views that have been exchanged during
746 -- instantiation to restore the visibility of the generic declaration.
747 -- (see comments above). After instantiation, the current visibility is
748 -- reestablished by means of a traversal of this list.
750 Hidden_Entities : Elist_Id;
751 -- This list holds the entities of the current scope that are removed
752 -- from immediate visibility when instantiating a child unit. Their
753 -- visibility is restored in Remove_Parent.
755 -- Because instantiations can be recursive, the following must be saved
756 -- on entry and restored on exit from an instantiation (spec or body).
757 -- This is done by the two procedures Save_Env and Restore_Env. For
758 -- package and subprogram instantiations (but not for the body instances)
759 -- the action of Save_Env is done in two steps: Init_Env is called before
760 -- Check_Generic_Child_Unit, because setting the parent instances requires
761 -- that the visibility data structures be properly initialized. Once the
762 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
764 Parent_Unit_Visible : Boolean := False;
765 -- Parent_Unit_Visible is used when the generic is a child unit, and
766 -- indicates whether the ultimate parent of the generic is visible in the
767 -- instantiation environment. It is used to reset the visibility of the
768 -- parent at the end of the instantiation (see Remove_Parent).
770 Instance_Parent_Unit : Entity_Id := Empty;
771 -- This records the ultimate parent unit of an instance of a generic
772 -- child unit and is used in conjunction with Parent_Unit_Visible to
773 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
775 type Instance_Env is record
776 Instantiated_Parent : Assoc;
777 Exchanged_Views : Elist_Id;
778 Hidden_Entities : Elist_Id;
779 Current_Sem_Unit : Unit_Number_Type;
780 Parent_Unit_Visible : Boolean := False;
781 Instance_Parent_Unit : Entity_Id := Empty;
782 Switches : Config_Switches_Type;
785 package Instance_Envs is new Table.Table (
786 Table_Component_Type => Instance_Env,
787 Table_Index_Type => Int,
788 Table_Low_Bound => 0,
790 Table_Increment => 100,
791 Table_Name => "Instance_Envs");
793 procedure Restore_Private_Views
794 (Pack_Id : Entity_Id;
795 Is_Package : Boolean := True);
796 -- Restore the private views of external types, and unmark the generic
797 -- renamings of actuals, so that they become comptible subtypes again.
798 -- For subprograms, Pack_Id is the package constructed to hold the
801 procedure Switch_View (T : Entity_Id);
802 -- Switch the partial and full views of a type and its private
803 -- dependents (i.e. its subtypes and derived types).
805 ------------------------------------
806 -- Structures for Error Reporting --
807 ------------------------------------
809 Instantiation_Node : Node_Id;
810 -- Used by subprograms that validate instantiation of formal parameters
811 -- where there might be no actual on which to place the error message.
812 -- Also used to locate the instantiation node for generic subunits.
814 Instantiation_Error : exception;
815 -- When there is a semantic error in the generic parameter matching,
816 -- there is no point in continuing the instantiation, because the
817 -- number of cascaded errors is unpredictable. This exception aborts
818 -- the instantiation process altogether.
820 S_Adjustment : Sloc_Adjustment;
821 -- Offset created for each node in an instantiation, in order to keep
822 -- track of the source position of the instantiation in each of its nodes.
823 -- A subsequent semantic error or warning on a construct of the instance
824 -- points to both places: the original generic node, and the point of
825 -- instantiation. See Sinput and Sinput.L for additional details.
827 ------------------------------------------------------------
828 -- Data structure for keeping track when inside a Generic --
829 ------------------------------------------------------------
831 -- The following table is used to save values of the Inside_A_Generic
832 -- flag (see spec of Sem) when they are saved by Start_Generic.
834 package Generic_Flags is new Table.Table (
835 Table_Component_Type => Boolean,
836 Table_Index_Type => Int,
837 Table_Low_Bound => 0,
839 Table_Increment => 200,
840 Table_Name => "Generic_Flags");
842 ---------------------------
843 -- Abandon_Instantiation --
844 ---------------------------
846 procedure Abandon_Instantiation (N : Node_Id) is
848 Error_Msg_N ("\instantiation abandoned!", N);
849 raise Instantiation_Error;
850 end Abandon_Instantiation;
852 --------------------------
853 -- Analyze_Associations --
854 --------------------------
856 function Analyze_Associations
859 F_Copy : List_Id) return List_Id
861 Actual_Types : constant Elist_Id := New_Elmt_List;
862 Assoc : constant List_Id := New_List;
863 Default_Actuals : constant Elist_Id := New_Elmt_List;
864 Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy));
868 Next_Formal : Node_Id;
869 Temp_Formal : Node_Id;
870 Analyzed_Formal : Node_Id;
873 First_Named : Node_Id := Empty;
875 Default_Formals : constant List_Id := New_List;
876 -- If an Other_Choice is present, some of the formals may be defaulted.
877 -- To simplify the treatement of visibility in an instance, we introduce
878 -- individual defaults for each such formal. These defaults are
879 -- appended to the list of associations and replace the Others_Choice.
881 Found_Assoc : Node_Id;
882 -- Association for the current formal being match. Empty if there are
883 -- no remaining actuals, or if there is no named association with the
884 -- name of the formal.
886 Is_Named_Assoc : Boolean;
887 Num_Matched : Int := 0;
888 Num_Actuals : Int := 0;
890 Others_Present : Boolean := False;
891 -- In Ada 2005, indicates partial parametrization of of a formal
892 -- package. As usual an others association must be last in the list.
894 function Matching_Actual
896 A_F : Entity_Id) return Node_Id;
897 -- Find actual that corresponds to a given a formal parameter. If the
898 -- actuals are positional, return the next one, if any. If the actuals
899 -- are named, scan the parameter associations to find the right one.
900 -- A_F is the corresponding entity in the analyzed generic,which is
901 -- placed on the selector name for ASIS use.
903 -- In Ada 2005, a named association may be given with a box, in which
904 -- case Matching_Actual sets Found_Assoc to the generic association,
905 -- but return Empty for the actual itself. In this case the code below
906 -- creates a corresponding declaration for the formal.
908 function Partial_Parametrization return Boolean;
909 -- Ada 2005: if no match is found for a given formal, check if the
910 -- association for it includes a box, or whether the associations
911 -- include an Others clause.
913 procedure Process_Default (F : Entity_Id);
914 -- Add a copy of the declaration of generic formal F to the list of
915 -- associations, and add an explicit box association for F if there
916 -- is none yet, and the default comes from an Others_Choice.
918 procedure Set_Analyzed_Formal;
919 -- Find the node in the generic copy that corresponds to a given formal.
920 -- The semantic information on this node is used to perform legality
921 -- checks on the actuals. Because semantic analysis can introduce some
922 -- anonymous entities or modify the declaration node itself, the
923 -- correspondence between the two lists is not one-one. In addition to
924 -- anonymous types, the presence a formal equality will introduce an
925 -- implicit declaration for the corresponding inequality.
927 ---------------------
928 -- Matching_Actual --
929 ---------------------
931 function Matching_Actual
933 A_F : Entity_Id) return Node_Id
939 Is_Named_Assoc := False;
941 -- End of list of purely positional parameters
944 or else Nkind (Actual) = N_Others_Choice
946 Found_Assoc := Empty;
949 -- Case of positional parameter corresponding to current formal
951 elsif No (Selector_Name (Actual)) then
952 Found_Assoc := Actual;
953 Act := Explicit_Generic_Actual_Parameter (Actual);
954 Num_Matched := Num_Matched + 1;
957 -- Otherwise scan list of named actuals to find the one with the
958 -- desired name. All remaining actuals have explicit names.
961 Is_Named_Assoc := True;
962 Found_Assoc := Empty;
966 while Present (Actual) loop
967 if Chars (Selector_Name (Actual)) = Chars (F) then
968 Set_Entity (Selector_Name (Actual), A_F);
969 Set_Etype (Selector_Name (Actual), Etype (A_F));
970 Generate_Reference (A_F, Selector_Name (Actual));
971 Found_Assoc := Actual;
972 Act := Explicit_Generic_Actual_Parameter (Actual);
973 Num_Matched := Num_Matched + 1;
981 -- Reset for subsequent searches. In most cases the named
982 -- associations are in order. If they are not, we reorder them
983 -- to avoid scanning twice the same actual. This is not just a
984 -- question of efficiency: there may be multiple defaults with
985 -- boxes that have the same name. In a nested instantiation we
986 -- insert actuals for those defaults, and cannot rely on their
987 -- names to disambiguate them.
989 if Actual = First_Named then
992 elsif Present (Actual) then
993 Insert_Before (First_Named, Remove_Next (Prev));
996 Actual := First_Named;
1000 end Matching_Actual;
1002 -----------------------------
1003 -- Partial_Parametrization --
1004 -----------------------------
1006 function Partial_Parametrization return Boolean is
1008 return Others_Present
1009 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1010 end Partial_Parametrization;
1012 ---------------------
1013 -- Process_Default --
1014 ---------------------
1016 procedure Process_Default (F : Entity_Id) is
1017 Loc : constant Source_Ptr := Sloc (I_Node);
1023 -- Append copy of formal declaration to associations, and create
1024 -- new defining identifier for it.
1026 Decl := New_Copy_Tree (F);
1028 if Nkind (F) = N_Formal_Concrete_Subprogram_Declaration then
1030 Make_Defining_Identifier (Sloc (Defining_Entity (F)),
1031 Chars => Chars (Defining_Entity (F)));
1032 Set_Defining_Unit_Name (Specification (Decl), Id);
1036 Make_Defining_Identifier (Sloc (Defining_Entity (F)),
1037 Chars => Chars (Defining_Identifier (F)));
1038 Set_Defining_Identifier (Decl, Id);
1041 Append (Decl, Assoc);
1043 if No (Found_Assoc) then
1045 Make_Generic_Association (Loc,
1046 Selector_Name => New_Occurrence_Of (Id, Loc),
1047 Explicit_Generic_Actual_Parameter => Empty);
1048 Set_Box_Present (Default);
1049 Append (Default, Default_Formals);
1051 end Process_Default;
1053 -------------------------
1054 -- Set_Analyzed_Formal --
1055 -------------------------
1057 procedure Set_Analyzed_Formal is
1060 while Present (Analyzed_Formal) loop
1061 Kind := Nkind (Analyzed_Formal);
1063 case Nkind (Formal) is
1065 when N_Formal_Subprogram_Declaration =>
1066 exit when Kind in N_Formal_Subprogram_Declaration
1069 (Defining_Unit_Name (Specification (Formal))) =
1071 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1073 when N_Formal_Package_Declaration =>
1075 Kind = N_Formal_Package_Declaration
1077 Kind = N_Generic_Package_Declaration
1079 Kind = N_Package_Declaration;
1081 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1085 -- Skip freeze nodes, and nodes inserted to replace
1086 -- unrecognized pragmas.
1089 Kind not in N_Formal_Subprogram_Declaration
1090 and then Kind /= N_Subprogram_Declaration
1091 and then Kind /= N_Freeze_Entity
1092 and then Kind /= N_Null_Statement
1093 and then Kind /= N_Itype_Reference
1094 and then Chars (Defining_Identifier (Formal)) =
1095 Chars (Defining_Identifier (Analyzed_Formal));
1098 Next (Analyzed_Formal);
1100 end Set_Analyzed_Formal;
1102 -- Start of processing for Analyze_Associations
1105 Actuals := Generic_Associations (I_Node);
1107 if Present (Actuals) then
1109 -- check for an Others choice, indicating a partial parametrization
1110 -- for a formal package.
1112 Actual := First (Actuals);
1113 while Present (Actual) loop
1114 if Nkind (Actual) = N_Others_Choice then
1115 Others_Present := True;
1116 if Present (Next (Actual)) then
1117 Error_Msg_N ("others must be last association", Actual);
1120 -- This subprogram is used both for formal packages and for
1121 -- instantiations. For the latter, associations must all be
1124 if Nkind (I_Node) /= N_Formal_Package_Declaration
1125 and then Comes_From_Source (I_Node)
1128 ("others association not allowed in an instance",
1132 -- In any case, nothing to do after the others association
1136 elsif Box_Present (Actual)
1137 and then Comes_From_Source (I_Node)
1138 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1141 ("box association not allowed in an instance", Actual);
1147 -- If named associations are present, save first named association
1148 -- (it may of course be Empty) to facilitate subsequent name search.
1150 First_Named := First (Actuals);
1151 while Present (First_Named)
1152 and then Nkind (First_Named) /= N_Others_Choice
1153 and then No (Selector_Name (First_Named))
1155 Num_Actuals := Num_Actuals + 1;
1160 Named := First_Named;
1161 while Present (Named) loop
1162 if Nkind (Named) /= N_Others_Choice
1163 and then No (Selector_Name (Named))
1165 Error_Msg_N ("invalid positional actual after named one", Named);
1166 Abandon_Instantiation (Named);
1169 -- A named association may lack an actual parameter, if it was
1170 -- introduced for a default subprogram that turns out to be local
1171 -- to the outer instantiation.
1173 if Nkind (Named) /= N_Others_Choice
1174 and then Present (Explicit_Generic_Actual_Parameter (Named))
1176 Num_Actuals := Num_Actuals + 1;
1182 if Present (Formals) then
1183 Formal := First_Non_Pragma (Formals);
1184 Analyzed_Formal := First_Non_Pragma (F_Copy);
1186 if Present (Actuals) then
1187 Actual := First (Actuals);
1189 -- All formals should have default values
1195 while Present (Formal) loop
1196 Set_Analyzed_Formal;
1197 Next_Formal := Next_Non_Pragma (Formal);
1199 case Nkind (Formal) is
1200 when N_Formal_Object_Declaration =>
1203 Defining_Identifier (Formal),
1204 Defining_Identifier (Analyzed_Formal));
1206 if No (Match) and then Partial_Parametrization then
1207 Process_Default (Formal);
1210 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1214 when N_Formal_Type_Declaration =>
1217 Defining_Identifier (Formal),
1218 Defining_Identifier (Analyzed_Formal));
1221 if Partial_Parametrization then
1222 Process_Default (Formal);
1225 Error_Msg_Sloc := Sloc (Gen_Unit);
1229 Defining_Identifier (Formal));
1230 Error_Msg_NE ("\in instantiation of & declared#",
1231 Instantiation_Node, Gen_Unit);
1232 Abandon_Instantiation (Instantiation_Node);
1239 (Formal, Match, Analyzed_Formal, Assoc),
1242 -- An instantiation is a freeze point for the actuals,
1243 -- unless this is a rewritten formal package.
1245 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1246 Append_Elmt (Entity (Match), Actual_Types);
1250 -- A remote access-to-class-wide type must not be an
1251 -- actual parameter for a generic formal of an access
1252 -- type (E.2.2 (17)).
1254 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1256 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1257 N_Access_To_Object_Definition
1259 Validate_Remote_Access_To_Class_Wide_Type (Match);
1262 when N_Formal_Subprogram_Declaration =>
1265 Defining_Unit_Name (Specification (Formal)),
1266 Defining_Unit_Name (Specification (Analyzed_Formal)));
1268 -- If the formal subprogram has the same name as
1269 -- another formal subprogram of the generic, then
1270 -- a named association is illegal (12.3(9)). Exclude
1271 -- named associations that are generated for a nested
1275 and then Is_Named_Assoc
1276 and then Comes_From_Source (Found_Assoc)
1278 Temp_Formal := First (Formals);
1279 while Present (Temp_Formal) loop
1280 if Nkind (Temp_Formal) in
1281 N_Formal_Subprogram_Declaration
1282 and then Temp_Formal /= Formal
1284 Chars (Selector_Name (Found_Assoc)) =
1285 Chars (Defining_Unit_Name
1286 (Specification (Temp_Formal)))
1289 ("name not allowed for overloaded formal",
1291 Abandon_Instantiation (Instantiation_Node);
1298 -- If there is no corresponding actual, this may be case of
1299 -- partial parametrization, or else the formal has a default
1303 and then Partial_Parametrization
1305 Process_Default (Formal);
1308 Instantiate_Formal_Subprogram
1309 (Formal, Match, Analyzed_Formal));
1312 -- If this is a nested generic, preserve default for later
1316 and then Box_Present (Formal)
1319 (Defining_Unit_Name (Specification (Last (Assoc))),
1323 when N_Formal_Package_Declaration =>
1326 Defining_Identifier (Formal),
1327 Defining_Identifier (Original_Node (Analyzed_Formal)));
1330 if Partial_Parametrization then
1331 Process_Default (Formal);
1334 Error_Msg_Sloc := Sloc (Gen_Unit);
1337 Instantiation_Node, Defining_Identifier (Formal));
1338 Error_Msg_NE ("\in instantiation of & declared#",
1339 Instantiation_Node, Gen_Unit);
1341 Abandon_Instantiation (Instantiation_Node);
1347 (Instantiate_Formal_Package
1348 (Formal, Match, Analyzed_Formal),
1352 -- For use type and use package appearing in the generic part,
1353 -- we have already copied them, so we can just move them where
1354 -- they belong (we mustn't recopy them since this would mess up
1355 -- the Sloc values).
1357 when N_Use_Package_Clause |
1358 N_Use_Type_Clause =>
1359 if Nkind (Original_Node (I_Node)) =
1360 N_Formal_Package_Declaration
1362 Append (New_Copy_Tree (Formal), Assoc);
1365 Append (Formal, Assoc);
1369 raise Program_Error;
1373 Formal := Next_Formal;
1374 Next_Non_Pragma (Analyzed_Formal);
1377 if Num_Actuals > Num_Matched then
1378 Error_Msg_Sloc := Sloc (Gen_Unit);
1380 if Present (Selector_Name (Actual)) then
1382 ("unmatched actual&",
1383 Actual, Selector_Name (Actual));
1384 Error_Msg_NE ("\in instantiation of& declared#",
1388 ("unmatched actual in instantiation of& declared#",
1393 elsif Present (Actuals) then
1395 ("too many actuals in generic instantiation", Instantiation_Node);
1399 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1402 while Present (Elmt) loop
1403 Freeze_Before (I_Node, Node (Elmt));
1408 -- If there are default subprograms, normalize the tree by adding
1409 -- explicit associations for them. This is required if the instance
1410 -- appears within a generic.
1418 Elmt := First_Elmt (Default_Actuals);
1419 while Present (Elmt) loop
1420 if No (Actuals) then
1421 Actuals := New_List;
1422 Set_Generic_Associations (I_Node, Actuals);
1425 Subp := Node (Elmt);
1427 Make_Generic_Association (Sloc (Subp),
1428 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1429 Explicit_Generic_Actual_Parameter =>
1430 New_Occurrence_Of (Subp, Sloc (Subp)));
1431 Mark_Rewrite_Insertion (New_D);
1432 Append_To (Actuals, New_D);
1437 -- If this is a formal package. normalize the parameter list by adding
1438 -- explicit box asssociations for the formals that are covered by an
1441 if not Is_Empty_List (Default_Formals) then
1442 Append_List (Default_Formals, Formals);
1446 end Analyze_Associations;
1448 -------------------------------
1449 -- Analyze_Formal_Array_Type --
1450 -------------------------------
1452 procedure Analyze_Formal_Array_Type
1453 (T : in out Entity_Id;
1459 -- Treated like a non-generic array declaration, with additional
1464 if Nkind (Def) = N_Constrained_Array_Definition then
1465 DSS := First (Discrete_Subtype_Definitions (Def));
1466 while Present (DSS) loop
1467 if Nkind (DSS) = N_Subtype_Indication
1468 or else Nkind (DSS) = N_Range
1469 or else Nkind (DSS) = N_Attribute_Reference
1471 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1478 Array_Type_Declaration (T, Def);
1479 Set_Is_Generic_Type (Base_Type (T));
1481 if Ekind (Component_Type (T)) = E_Incomplete_Type
1482 and then No (Full_View (Component_Type (T)))
1484 Error_Msg_N ("premature usage of incomplete type", Def);
1486 -- Check that range constraint is not allowed on the component type
1487 -- of a generic formal array type (AARM 12.5.3(3))
1489 elsif Is_Internal (Component_Type (T))
1490 and then Present (Subtype_Indication (Component_Definition (Def)))
1491 and then Nkind (Original_Node
1492 (Subtype_Indication (Component_Definition (Def))))
1493 = N_Subtype_Indication
1496 ("in a formal, a subtype indication can only be "
1497 & "a subtype mark ('R'M 12.5.3(3))",
1498 Subtype_Indication (Component_Definition (Def)));
1501 end Analyze_Formal_Array_Type;
1503 ---------------------------------------------
1504 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1505 ---------------------------------------------
1507 -- As for other generic types, we create a valid type representation with
1508 -- legal but arbitrary attributes, whose values are never considered
1509 -- static. For all scalar types we introduce an anonymous base type, with
1510 -- the same attributes. We choose the corresponding integer type to be
1511 -- Standard_Integer.
1513 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1517 Loc : constant Source_Ptr := Sloc (Def);
1518 Base : constant Entity_Id :=
1520 (E_Decimal_Fixed_Point_Type,
1521 Current_Scope, Sloc (Def), 'G');
1522 Int_Base : constant Entity_Id := Standard_Integer;
1523 Delta_Val : constant Ureal := Ureal_1;
1524 Digs_Val : constant Uint := Uint_6;
1529 Set_Etype (Base, Base);
1530 Set_Size_Info (Base, Int_Base);
1531 Set_RM_Size (Base, RM_Size (Int_Base));
1532 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1533 Set_Digits_Value (Base, Digs_Val);
1534 Set_Delta_Value (Base, Delta_Val);
1535 Set_Small_Value (Base, Delta_Val);
1536 Set_Scalar_Range (Base,
1538 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1539 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1541 Set_Is_Generic_Type (Base);
1542 Set_Parent (Base, Parent (Def));
1544 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1545 Set_Etype (T, Base);
1546 Set_Size_Info (T, Int_Base);
1547 Set_RM_Size (T, RM_Size (Int_Base));
1548 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1549 Set_Digits_Value (T, Digs_Val);
1550 Set_Delta_Value (T, Delta_Val);
1551 Set_Small_Value (T, Delta_Val);
1552 Set_Scalar_Range (T, Scalar_Range (Base));
1553 Set_Is_Constrained (T);
1555 Check_Restriction (No_Fixed_Point, Def);
1556 end Analyze_Formal_Decimal_Fixed_Point_Type;
1558 -------------------------------------------
1559 -- Analyze_Formal_Derived_Interface_Type --
1560 -------------------------------------------
1562 procedure Analyze_Formal_Derived_Interface_Type
1567 Loc : constant Source_Ptr := Sloc (Def);
1571 -- Rewrite as a type declaration of a derived type. This ensures that
1572 -- the interface list and primitive operations are properly captured.
1575 Make_Full_Type_Declaration (Loc,
1576 Defining_Identifier => T,
1577 Type_Definition => Def);
1581 Set_Is_Generic_Type (T);
1582 end Analyze_Formal_Derived_Interface_Type;
1584 ---------------------------------
1585 -- Analyze_Formal_Derived_Type --
1586 ---------------------------------
1588 procedure Analyze_Formal_Derived_Type
1593 Loc : constant Source_Ptr := Sloc (Def);
1594 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1598 Set_Is_Generic_Type (T);
1600 if Private_Present (Def) then
1602 Make_Private_Extension_Declaration (Loc,
1603 Defining_Identifier => T,
1604 Discriminant_Specifications => Discriminant_Specifications (N),
1605 Unknown_Discriminants_Present => Unk_Disc,
1606 Subtype_Indication => Subtype_Mark (Def),
1607 Interface_List => Interface_List (Def));
1609 Set_Abstract_Present (New_N, Abstract_Present (Def));
1610 Set_Limited_Present (New_N, Limited_Present (Def));
1611 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1615 Make_Full_Type_Declaration (Loc,
1616 Defining_Identifier => T,
1617 Discriminant_Specifications =>
1618 Discriminant_Specifications (Parent (T)),
1620 Make_Derived_Type_Definition (Loc,
1621 Subtype_Indication => Subtype_Mark (Def)));
1623 Set_Abstract_Present
1624 (Type_Definition (New_N), Abstract_Present (Def));
1626 (Type_Definition (New_N), Limited_Present (Def));
1633 if not Is_Composite_Type (T) then
1635 ("unknown discriminants not allowed for elementary types", N);
1637 Set_Has_Unknown_Discriminants (T);
1638 Set_Is_Constrained (T, False);
1642 -- If the parent type has a known size, so does the formal, which makes
1643 -- legal representation clauses that involve the formal.
1645 Set_Size_Known_At_Compile_Time
1646 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1648 end Analyze_Formal_Derived_Type;
1650 ----------------------------------
1651 -- Analyze_Formal_Discrete_Type --
1652 ----------------------------------
1654 -- The operations defined for a discrete types are those of an enumeration
1655 -- type. The size is set to an arbitrary value, for use in analyzing the
1658 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1659 Loc : constant Source_Ptr := Sloc (Def);
1663 Base : constant Entity_Id :=
1665 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1668 Set_Ekind (T, E_Enumeration_Subtype);
1669 Set_Etype (T, Base);
1672 Set_Is_Generic_Type (T);
1673 Set_Is_Constrained (T);
1675 -- For semantic analysis, the bounds of the type must be set to some
1676 -- non-static value. The simplest is to create attribute nodes for those
1677 -- bounds, that refer to the type itself. These bounds are never
1678 -- analyzed but serve as place-holders.
1681 Make_Attribute_Reference (Loc,
1682 Attribute_Name => Name_First,
1683 Prefix => New_Reference_To (T, Loc));
1687 Make_Attribute_Reference (Loc,
1688 Attribute_Name => Name_Last,
1689 Prefix => New_Reference_To (T, Loc));
1692 Set_Scalar_Range (T,
1697 Set_Ekind (Base, E_Enumeration_Type);
1698 Set_Etype (Base, Base);
1699 Init_Size (Base, 8);
1700 Init_Alignment (Base);
1701 Set_Is_Generic_Type (Base);
1702 Set_Scalar_Range (Base, Scalar_Range (T));
1703 Set_Parent (Base, Parent (Def));
1704 end Analyze_Formal_Discrete_Type;
1706 ----------------------------------
1707 -- Analyze_Formal_Floating_Type --
1708 ---------------------------------
1710 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1711 Base : constant Entity_Id :=
1713 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1716 -- The various semantic attributes are taken from the predefined type
1717 -- Float, just so that all of them are initialized. Their values are
1718 -- never used because no constant folding or expansion takes place in
1719 -- the generic itself.
1722 Set_Ekind (T, E_Floating_Point_Subtype);
1723 Set_Etype (T, Base);
1724 Set_Size_Info (T, (Standard_Float));
1725 Set_RM_Size (T, RM_Size (Standard_Float));
1726 Set_Digits_Value (T, Digits_Value (Standard_Float));
1727 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1728 Set_Is_Constrained (T);
1730 Set_Is_Generic_Type (Base);
1731 Set_Etype (Base, Base);
1732 Set_Size_Info (Base, (Standard_Float));
1733 Set_RM_Size (Base, RM_Size (Standard_Float));
1734 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1735 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1736 Set_Parent (Base, Parent (Def));
1738 Check_Restriction (No_Floating_Point, Def);
1739 end Analyze_Formal_Floating_Type;
1741 -----------------------------------
1742 -- Analyze_Formal_Interface_Type;--
1743 -----------------------------------
1745 procedure Analyze_Formal_Interface_Type
1750 Loc : constant Source_Ptr := Sloc (N);
1755 Make_Full_Type_Declaration (Loc,
1756 Defining_Identifier => T,
1757 Type_Definition => Def);
1761 Set_Is_Generic_Type (T);
1762 end Analyze_Formal_Interface_Type;
1764 ---------------------------------
1765 -- Analyze_Formal_Modular_Type --
1766 ---------------------------------
1768 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1770 -- Apart from their entity kind, generic modular types are treated like
1771 -- signed integer types, and have the same attributes.
1773 Analyze_Formal_Signed_Integer_Type (T, Def);
1774 Set_Ekind (T, E_Modular_Integer_Subtype);
1775 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1777 end Analyze_Formal_Modular_Type;
1779 ---------------------------------------
1780 -- Analyze_Formal_Object_Declaration --
1781 ---------------------------------------
1783 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1784 E : constant Node_Id := Default_Expression (N);
1785 Id : constant Node_Id := Defining_Identifier (N);
1792 -- Determine the mode of the formal object
1794 if Out_Present (N) then
1795 K := E_Generic_In_Out_Parameter;
1797 if not In_Present (N) then
1798 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1802 K := E_Generic_In_Parameter;
1805 if Present (Subtype_Mark (N)) then
1806 Find_Type (Subtype_Mark (N));
1807 T := Entity (Subtype_Mark (N));
1809 -- Ada 2005 (AI-423): Formal object with an access definition
1812 Check_Access_Definition (N);
1813 T := Access_Definition
1815 N => Access_Definition (N));
1818 if Ekind (T) = E_Incomplete_Type then
1820 Error_Node : Node_Id;
1823 if Present (Subtype_Mark (N)) then
1824 Error_Node := Subtype_Mark (N);
1826 Check_Access_Definition (N);
1827 Error_Node := Access_Definition (N);
1830 Error_Msg_N ("premature usage of incomplete type", Error_Node);
1834 if K = E_Generic_In_Parameter then
1836 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1838 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1840 ("generic formal of mode IN must not be of limited type", N);
1841 Explain_Limited_Type (T, N);
1844 if Is_Abstract_Type (T) then
1846 ("generic formal of mode IN must not be of abstract type", N);
1850 Analyze_Per_Use_Expression (E, T);
1852 if Is_Limited_Type (T) and then not OK_For_Limited_Init (E) then
1854 ("initialization not allowed for limited types", E);
1855 Explain_Limited_Type (T, E);
1862 -- Case of generic IN OUT parameter
1865 -- If the formal has an unconstrained type, construct its actual
1866 -- subtype, as is done for subprogram formals. In this fashion, all
1867 -- its uses can refer to specific bounds.
1872 if (Is_Array_Type (T)
1873 and then not Is_Constrained (T))
1875 (Ekind (T) = E_Record_Type
1876 and then Has_Discriminants (T))
1879 Non_Freezing_Ref : constant Node_Id :=
1880 New_Reference_To (Id, Sloc (Id));
1884 -- Make sure the actual subtype doesn't generate bogus freezing
1886 Set_Must_Not_Freeze (Non_Freezing_Ref);
1887 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1888 Insert_Before_And_Analyze (N, Decl);
1889 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1892 Set_Actual_Subtype (Id, T);
1897 ("initialization not allowed for `IN OUT` formals", N);
1901 end Analyze_Formal_Object_Declaration;
1903 ----------------------------------------------
1904 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1905 ----------------------------------------------
1907 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1911 Loc : constant Source_Ptr := Sloc (Def);
1912 Base : constant Entity_Id :=
1914 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1916 -- The semantic attributes are set for completeness only, their values
1917 -- will never be used, since all properties of the type are non-static.
1920 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1921 Set_Etype (T, Base);
1922 Set_Size_Info (T, Standard_Integer);
1923 Set_RM_Size (T, RM_Size (Standard_Integer));
1924 Set_Small_Value (T, Ureal_1);
1925 Set_Delta_Value (T, Ureal_1);
1926 Set_Scalar_Range (T,
1928 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1929 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1930 Set_Is_Constrained (T);
1932 Set_Is_Generic_Type (Base);
1933 Set_Etype (Base, Base);
1934 Set_Size_Info (Base, Standard_Integer);
1935 Set_RM_Size (Base, RM_Size (Standard_Integer));
1936 Set_Small_Value (Base, Ureal_1);
1937 Set_Delta_Value (Base, Ureal_1);
1938 Set_Scalar_Range (Base, Scalar_Range (T));
1939 Set_Parent (Base, Parent (Def));
1941 Check_Restriction (No_Fixed_Point, Def);
1942 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1944 ----------------------------
1945 -- Analyze_Formal_Package --
1946 ----------------------------
1948 procedure Analyze_Formal_Package (N : Node_Id) is
1949 Loc : constant Source_Ptr := Sloc (N);
1950 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1952 Gen_Id : constant Node_Id := Name (N);
1954 Gen_Unit : Entity_Id;
1956 Parent_Installed : Boolean := False;
1958 Parent_Instance : Entity_Id;
1959 Renaming_In_Par : Entity_Id;
1960 No_Associations : Boolean := False;
1962 function Build_Local_Package return Node_Id;
1963 -- The formal package is rewritten so that its parameters are replaced
1964 -- with corresponding declarations. For parameters with bona fide
1965 -- associations these declarations are created by Analyze_Associations
1966 -- as for aa regular instantiation. For boxed parameters, we preserve
1967 -- the formal declarations and analyze them, in order to introduce
1968 -- entities of the right kind in the environment of the formal.
1970 -------------------------
1971 -- Build_Local_Package --
1972 -------------------------
1974 function Build_Local_Package return Node_Id is
1976 Pack_Decl : Node_Id;
1979 -- Within the formal, the name of the generic package is a renaming
1980 -- of the formal (as for a regular instantiation).
1983 Make_Package_Declaration (Loc,
1986 (Specification (Original_Node (Gen_Decl)),
1987 Empty, Instantiating => True));
1989 Renaming := Make_Package_Renaming_Declaration (Loc,
1990 Defining_Unit_Name =>
1991 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1992 Name => New_Occurrence_Of (Formal, Loc));
1994 if Nkind (Gen_Id) = N_Identifier
1995 and then Chars (Gen_Id) = Chars (Pack_Id)
1998 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2001 -- If the formal is declared with a box, or with an others choice,
2002 -- create corresponding declarations for all entities in the formal
2003 -- part, so that names with the proper types are available in the
2004 -- specification of the formal package.
2006 if No_Associations then
2008 Formal_Decl : Node_Id;
2011 -- TBA : for a formal package, need to recurse ???
2016 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2017 while Present (Formal_Decl) loop
2019 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2024 -- If generic associations are present, use Analyze_Associations to
2025 -- create the proper renaming declarations.
2029 Act_Tree : constant Node_Id :=
2031 (Original_Node (Gen_Decl), Empty,
2032 Instantiating => True);
2035 Generic_Renamings.Set_Last (0);
2036 Generic_Renamings_HTable.Reset;
2037 Instantiation_Node := N;
2040 Analyze_Associations
2042 Generic_Formal_Declarations (Act_Tree),
2043 Generic_Formal_Declarations (Gen_Decl));
2047 Append (Renaming, To => Decls);
2049 -- Add generated declarations ahead of local declarations in
2052 if No (Visible_Declarations (Specification (Pack_Decl))) then
2053 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2056 (First (Visible_Declarations (Specification (Pack_Decl))),
2061 end Build_Local_Package;
2063 -- Start of processing for Analyze_Formal_Package
2066 Text_IO_Kludge (Gen_Id);
2069 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2070 Gen_Unit := Entity (Gen_Id);
2072 -- Check for a formal package that is a package renaming
2074 if Present (Renamed_Object (Gen_Unit)) then
2075 Gen_Unit := Renamed_Object (Gen_Unit);
2078 if Ekind (Gen_Unit) /= E_Generic_Package then
2079 Error_Msg_N ("expect generic package name", Gen_Id);
2083 elsif Gen_Unit = Current_Scope then
2085 ("generic package cannot be used as a formal package of itself",
2090 elsif In_Open_Scopes (Gen_Unit) then
2091 if Is_Compilation_Unit (Gen_Unit)
2092 and then Is_Child_Unit (Current_Scope)
2094 -- Special-case the error when the formal is a parent, and
2095 -- continue analysis to minimize cascaded errors.
2098 ("generic parent cannot be used as formal package "
2099 & "of a child unit",
2104 ("generic package cannot be used as a formal package "
2113 or else No (Generic_Associations (N))
2114 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2116 No_Associations := True;
2119 -- If there are no generic associations, the generic parameters appear
2120 -- as local entities and are instantiated like them. We copy the generic
2121 -- package declaration as if it were an instantiation, and analyze it
2122 -- like a regular package, except that we treat the formals as
2123 -- additional visible components.
2125 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2127 if In_Extended_Main_Source_Unit (N) then
2128 Set_Is_Instantiated (Gen_Unit);
2129 Generate_Reference (Gen_Unit, N);
2132 Formal := New_Copy (Pack_Id);
2133 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2135 -- Make local generic without formals. The formals will be replaced with
2136 -- internal declarations.
2138 New_N := Build_Local_Package;
2140 Set_Defining_Unit_Name (Specification (New_N), Formal);
2141 Set_Generic_Parent (Specification (N), Gen_Unit);
2142 Set_Instance_Env (Gen_Unit, Formal);
2143 Set_Is_Generic_Instance (Formal);
2145 Enter_Name (Formal);
2146 Set_Ekind (Formal, E_Package);
2147 Set_Etype (Formal, Standard_Void_Type);
2148 Set_Inner_Instances (Formal, New_Elmt_List);
2149 Push_Scope (Formal);
2151 if Is_Child_Unit (Gen_Unit)
2152 and then Parent_Installed
2154 -- Similarly, we have to make the name of the formal visible in the
2155 -- parent instance, to resolve properly fully qualified names that
2156 -- may appear in the generic unit. The parent instance has been
2157 -- placed on the scope stack ahead of the current scope.
2159 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2162 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2163 Set_Ekind (Renaming_In_Par, E_Package);
2164 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2165 Set_Scope (Renaming_In_Par, Parent_Instance);
2166 Set_Parent (Renaming_In_Par, Parent (Formal));
2167 Set_Renamed_Object (Renaming_In_Par, Formal);
2168 Append_Entity (Renaming_In_Par, Parent_Instance);
2171 Analyze (Specification (N));
2173 -- The formals for which associations are provided are not visible
2174 -- outside of the formal package. The others are still declared by a
2175 -- formal parameter declaration.
2177 if not No_Associations then
2182 E := First_Entity (Formal);
2183 while Present (E) loop
2184 exit when Ekind (E) = E_Package
2185 and then Renamed_Entity (E) = Formal;
2187 if not Is_Generic_Formal (E) then
2196 End_Package_Scope (Formal);
2198 if Parent_Installed then
2204 -- Inside the generic unit, the formal package is a regular package, but
2205 -- no body is needed for it. Note that after instantiation, the defining
2206 -- unit name we need is in the new tree and not in the original (see
2207 -- Package_Instantiation). A generic formal package is an instance, and
2208 -- can be used as an actual for an inner instance.
2210 Set_Has_Completion (Formal, True);
2212 -- Add semantic information to the original defining identifier.
2215 Set_Ekind (Pack_Id, E_Package);
2216 Set_Etype (Pack_Id, Standard_Void_Type);
2217 Set_Scope (Pack_Id, Scope (Formal));
2218 Set_Has_Completion (Pack_Id, True);
2220 -- If there are errors in the parameter list, Analyze_Associations
2221 -- raises Instantiation_Error. Patch the declaration to prevent
2222 -- further exception propagation.
2225 when Instantiation_Error =>
2227 Enter_Name (Formal);
2228 Set_Ekind (Formal, E_Variable);
2229 Set_Etype (Formal, Any_Type);
2231 if Parent_Installed then
2234 end Analyze_Formal_Package;
2236 ---------------------------------
2237 -- Analyze_Formal_Private_Type --
2238 ---------------------------------
2240 procedure Analyze_Formal_Private_Type
2246 New_Private_Type (N, T, Def);
2248 -- Set the size to an arbitrary but legal value
2250 Set_Size_Info (T, Standard_Integer);
2251 Set_RM_Size (T, RM_Size (Standard_Integer));
2252 end Analyze_Formal_Private_Type;
2254 ----------------------------------------
2255 -- Analyze_Formal_Signed_Integer_Type --
2256 ----------------------------------------
2258 procedure Analyze_Formal_Signed_Integer_Type
2262 Base : constant Entity_Id :=
2264 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
2269 Set_Ekind (T, E_Signed_Integer_Subtype);
2270 Set_Etype (T, Base);
2271 Set_Size_Info (T, Standard_Integer);
2272 Set_RM_Size (T, RM_Size (Standard_Integer));
2273 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2274 Set_Is_Constrained (T);
2276 Set_Is_Generic_Type (Base);
2277 Set_Size_Info (Base, Standard_Integer);
2278 Set_RM_Size (Base, RM_Size (Standard_Integer));
2279 Set_Etype (Base, Base);
2280 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2281 Set_Parent (Base, Parent (Def));
2282 end Analyze_Formal_Signed_Integer_Type;
2284 -------------------------------
2285 -- Analyze_Formal_Subprogram --
2286 -------------------------------
2288 procedure Analyze_Formal_Subprogram (N : Node_Id) is
2289 Spec : constant Node_Id := Specification (N);
2290 Def : constant Node_Id := Default_Name (N);
2291 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2299 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2300 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2304 Analyze_Subprogram_Declaration (N);
2305 Set_Is_Formal_Subprogram (Nam);
2306 Set_Has_Completion (Nam);
2308 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2309 Set_Is_Abstract_Subprogram (Nam);
2310 Set_Is_Dispatching_Operation (Nam);
2313 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2315 if No (Ctrl_Type) then
2317 ("abstract formal subprogram must have a controlling type",
2320 Check_Controlling_Formals (Ctrl_Type, Nam);
2325 -- Default name is resolved at the point of instantiation
2327 if Box_Present (N) then
2330 -- Else default is bound at the point of generic declaration
2332 elsif Present (Def) then
2333 if Nkind (Def) = N_Operator_Symbol then
2334 Find_Direct_Name (Def);
2336 elsif Nkind (Def) /= N_Attribute_Reference then
2340 -- For an attribute reference, analyze the prefix and verify
2341 -- that it has the proper profile for the subprogram.
2343 Analyze (Prefix (Def));
2344 Valid_Default_Attribute (Nam, Def);
2348 -- Default name may be overloaded, in which case the interpretation
2349 -- with the correct profile must be selected, as for a renaming.
2351 if Etype (Def) = Any_Type then
2354 elsif Nkind (Def) = N_Selected_Component then
2355 Subp := Entity (Selector_Name (Def));
2357 if Ekind (Subp) /= E_Entry then
2358 Error_Msg_N ("expect valid subprogram name as default", Def);
2362 elsif Nkind (Def) = N_Indexed_Component then
2364 if Nkind (Prefix (Def)) /= N_Selected_Component then
2365 Error_Msg_N ("expect valid subprogram name as default", Def);
2369 Subp := Entity (Selector_Name (Prefix (Def)));
2371 if Ekind (Subp) /= E_Entry_Family then
2372 Error_Msg_N ("expect valid subprogram name as default", Def);
2377 elsif Nkind (Def) = N_Character_Literal then
2379 -- Needs some type checks: subprogram should be parameterless???
2381 Resolve (Def, (Etype (Nam)));
2383 elsif not Is_Entity_Name (Def)
2384 or else not Is_Overloadable (Entity (Def))
2386 Error_Msg_N ("expect valid subprogram name as default", Def);
2389 elsif not Is_Overloaded (Def) then
2390 Subp := Entity (Def);
2393 Error_Msg_N ("premature usage of formal subprogram", Def);
2395 elsif not Entity_Matches_Spec (Subp, Nam) then
2396 Error_Msg_N ("no visible entity matches specification", Def);
2402 I1 : Interp_Index := 0;
2408 Get_First_Interp (Def, I, It);
2409 while Present (It.Nam) loop
2411 if Entity_Matches_Spec (It.Nam, Nam) then
2412 if Subp /= Any_Id then
2413 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2415 if It1 = No_Interp then
2416 Error_Msg_N ("ambiguous default subprogram", Def);
2429 Get_Next_Interp (I, It);
2433 if Subp /= Any_Id then
2434 Set_Entity (Def, Subp);
2437 Error_Msg_N ("premature usage of formal subprogram", Def);
2439 elsif Ekind (Subp) /= E_Operator then
2440 Check_Mode_Conformant (Subp, Nam);
2444 Error_Msg_N ("no visible subprogram matches specification", N);
2448 end Analyze_Formal_Subprogram;
2450 -------------------------------------
2451 -- Analyze_Formal_Type_Declaration --
2452 -------------------------------------
2454 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2455 Def : constant Node_Id := Formal_Type_Definition (N);
2459 T := Defining_Identifier (N);
2461 if Present (Discriminant_Specifications (N))
2462 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2465 ("discriminants not allowed for this formal type",
2466 Defining_Identifier (First (Discriminant_Specifications (N))));
2469 -- Enter the new name, and branch to specific routine
2472 when N_Formal_Private_Type_Definition =>
2473 Analyze_Formal_Private_Type (N, T, Def);
2475 when N_Formal_Derived_Type_Definition =>
2476 Analyze_Formal_Derived_Type (N, T, Def);
2478 when N_Formal_Discrete_Type_Definition =>
2479 Analyze_Formal_Discrete_Type (T, Def);
2481 when N_Formal_Signed_Integer_Type_Definition =>
2482 Analyze_Formal_Signed_Integer_Type (T, Def);
2484 when N_Formal_Modular_Type_Definition =>
2485 Analyze_Formal_Modular_Type (T, Def);
2487 when N_Formal_Floating_Point_Definition =>
2488 Analyze_Formal_Floating_Type (T, Def);
2490 when N_Formal_Ordinary_Fixed_Point_Definition =>
2491 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2493 when N_Formal_Decimal_Fixed_Point_Definition =>
2494 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2496 when N_Array_Type_Definition =>
2497 Analyze_Formal_Array_Type (T, Def);
2499 when N_Access_To_Object_Definition |
2500 N_Access_Function_Definition |
2501 N_Access_Procedure_Definition =>
2502 Analyze_Generic_Access_Type (T, Def);
2504 -- Ada 2005: a interface declaration is encoded as an abstract
2505 -- record declaration or a abstract type derivation.
2507 when N_Record_Definition =>
2508 Analyze_Formal_Interface_Type (N, T, Def);
2510 when N_Derived_Type_Definition =>
2511 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2517 raise Program_Error;
2521 Set_Is_Generic_Type (T);
2522 end Analyze_Formal_Type_Declaration;
2524 ------------------------------------
2525 -- Analyze_Function_Instantiation --
2526 ------------------------------------
2528 procedure Analyze_Function_Instantiation (N : Node_Id) is
2530 Analyze_Subprogram_Instantiation (N, E_Function);
2531 end Analyze_Function_Instantiation;
2533 ---------------------------------
2534 -- Analyze_Generic_Access_Type --
2535 ---------------------------------
2537 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2541 if Nkind (Def) = N_Access_To_Object_Definition then
2542 Access_Type_Declaration (T, Def);
2544 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2545 and then No (Full_View (Designated_Type (T)))
2546 and then not Is_Generic_Type (Designated_Type (T))
2548 Error_Msg_N ("premature usage of incomplete type", Def);
2550 elsif Is_Internal (Designated_Type (T)) then
2552 ("only a subtype mark is allowed in a formal", Def);
2556 Access_Subprogram_Declaration (T, Def);
2558 end Analyze_Generic_Access_Type;
2560 ---------------------------------
2561 -- Analyze_Generic_Formal_Part --
2562 ---------------------------------
2564 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2565 Gen_Parm_Decl : Node_Id;
2568 -- The generic formals are processed in the scope of the generic unit,
2569 -- where they are immediately visible. The scope is installed by the
2572 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2574 while Present (Gen_Parm_Decl) loop
2575 Analyze (Gen_Parm_Decl);
2576 Next (Gen_Parm_Decl);
2579 Generate_Reference_To_Generic_Formals (Current_Scope);
2580 end Analyze_Generic_Formal_Part;
2582 ------------------------------------------
2583 -- Analyze_Generic_Package_Declaration --
2584 ------------------------------------------
2586 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2587 Loc : constant Source_Ptr := Sloc (N);
2590 Save_Parent : Node_Id;
2592 Decls : constant List_Id :=
2593 Visible_Declarations (Specification (N));
2597 -- We introduce a renaming of the enclosing package, to have a usable
2598 -- entity as the prefix of an expanded name for a local entity of the
2599 -- form Par.P.Q, where P is the generic package. This is because a local
2600 -- entity named P may hide it, so that the usual visibility rules in
2601 -- the instance will not resolve properly.
2604 Make_Package_Renaming_Declaration (Loc,
2605 Defining_Unit_Name =>
2606 Make_Defining_Identifier (Loc,
2607 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2608 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2610 if Present (Decls) then
2611 Decl := First (Decls);
2612 while Present (Decl)
2613 and then Nkind (Decl) = N_Pragma
2618 if Present (Decl) then
2619 Insert_Before (Decl, Renaming);
2621 Append (Renaming, Visible_Declarations (Specification (N)));
2625 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2628 -- Create copy of generic unit, and save for instantiation. If the unit
2629 -- is a child unit, do not copy the specifications for the parent, which
2630 -- are not part of the generic tree.
2632 Save_Parent := Parent_Spec (N);
2633 Set_Parent_Spec (N, Empty);
2635 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2636 Set_Parent_Spec (New_N, Save_Parent);
2638 Id := Defining_Entity (N);
2639 Generate_Definition (Id);
2641 -- Expansion is not applied to generic units
2646 Set_Ekind (Id, E_Generic_Package);
2647 Set_Etype (Id, Standard_Void_Type);
2649 Enter_Generic_Scope (Id);
2650 Set_Inner_Instances (Id, New_Elmt_List);
2652 Set_Categorization_From_Pragmas (N);
2653 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2655 -- Link the declaration of the generic homonym in the generic copy to
2656 -- the package it renames, so that it is always resolved properly.
2658 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2659 Set_Entity (Associated_Node (Name (Renaming)), Id);
2661 -- For a library unit, we have reconstructed the entity for the unit,
2662 -- and must reset it in the library tables.
2664 if Nkind (Parent (N)) = N_Compilation_Unit then
2665 Set_Cunit_Entity (Current_Sem_Unit, Id);
2668 Analyze_Generic_Formal_Part (N);
2670 -- After processing the generic formals, analysis proceeds as for a
2671 -- non-generic package.
2673 Analyze (Specification (N));
2675 Validate_Categorization_Dependency (N, Id);
2679 End_Package_Scope (Id);
2680 Exit_Generic_Scope (Id);
2682 if Nkind (Parent (N)) /= N_Compilation_Unit then
2683 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2684 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2685 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2688 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2689 Validate_RT_RAT_Component (N);
2691 -- If this is a spec without a body, check that generic parameters
2694 if not Body_Required (Parent (N)) then
2695 Check_References (Id);
2698 end Analyze_Generic_Package_Declaration;
2700 --------------------------------------------
2701 -- Analyze_Generic_Subprogram_Declaration --
2702 --------------------------------------------
2704 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2709 Result_Type : Entity_Id;
2710 Save_Parent : Node_Id;
2713 -- Create copy of generic unit,and save for instantiation. If the unit
2714 -- is a child unit, do not copy the specifications for the parent, which
2715 -- are not part of the generic tree.
2717 Save_Parent := Parent_Spec (N);
2718 Set_Parent_Spec (N, Empty);
2720 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2721 Set_Parent_Spec (New_N, Save_Parent);
2724 Spec := Specification (N);
2725 Id := Defining_Entity (Spec);
2726 Generate_Definition (Id);
2728 if Nkind (Id) = N_Defining_Operator_Symbol then
2730 ("operator symbol not allowed for generic subprogram", Id);
2737 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2739 Enter_Generic_Scope (Id);
2740 Set_Inner_Instances (Id, New_Elmt_List);
2741 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2743 Analyze_Generic_Formal_Part (N);
2745 Formals := Parameter_Specifications (Spec);
2747 if Present (Formals) then
2748 Process_Formals (Formals, Spec);
2751 if Nkind (Spec) = N_Function_Specification then
2752 Set_Ekind (Id, E_Generic_Function);
2754 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
2755 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
2756 Set_Etype (Id, Result_Type);
2758 Find_Type (Result_Definition (Spec));
2759 Set_Etype (Id, Entity (Result_Definition (Spec)));
2763 Set_Ekind (Id, E_Generic_Procedure);
2764 Set_Etype (Id, Standard_Void_Type);
2767 -- For a library unit, we have reconstructed the entity for the unit,
2768 -- and must reset it in the library tables. We also make sure that
2769 -- Body_Required is set properly in the original compilation unit node.
2771 if Nkind (Parent (N)) = N_Compilation_Unit then
2772 Set_Cunit_Entity (Current_Sem_Unit, Id);
2773 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2776 Set_Categorization_From_Pragmas (N);
2777 Validate_Categorization_Dependency (N, Id);
2779 Save_Global_References (Original_Node (N));
2783 Exit_Generic_Scope (Id);
2784 Generate_Reference_To_Formals (Id);
2785 end Analyze_Generic_Subprogram_Declaration;
2787 -----------------------------------
2788 -- Analyze_Package_Instantiation --
2789 -----------------------------------
2791 procedure Analyze_Package_Instantiation (N : Node_Id) is
2792 Loc : constant Source_Ptr := Sloc (N);
2793 Gen_Id : constant Node_Id := Name (N);
2796 Act_Decl_Name : Node_Id;
2797 Act_Decl_Id : Entity_Id;
2802 Gen_Unit : Entity_Id;
2804 Is_Actual_Pack : constant Boolean :=
2805 Is_Internal (Defining_Entity (N));
2807 Env_Installed : Boolean := False;
2808 Parent_Installed : Boolean := False;
2809 Renaming_List : List_Id;
2810 Unit_Renaming : Node_Id;
2811 Needs_Body : Boolean;
2812 Inline_Now : Boolean := False;
2814 procedure Delay_Descriptors (E : Entity_Id);
2815 -- Delay generation of subprogram descriptors for given entity
2817 function Might_Inline_Subp return Boolean;
2818 -- If inlining is active and the generic contains inlined subprograms,
2819 -- we instantiate the body. This may cause superfluous instantiations,
2820 -- but it is simpler than detecting the need for the body at the point
2821 -- of inlining, when the context of the instance is not available.
2823 -----------------------
2824 -- Delay_Descriptors --
2825 -----------------------
2827 procedure Delay_Descriptors (E : Entity_Id) is
2829 if not Delay_Subprogram_Descriptors (E) then
2830 Set_Delay_Subprogram_Descriptors (E);
2831 Pending_Descriptor.Increment_Last;
2832 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2834 end Delay_Descriptors;
2836 -----------------------
2837 -- Might_Inline_Subp --
2838 -----------------------
2840 function Might_Inline_Subp return Boolean is
2844 if not Inline_Processing_Required then
2848 E := First_Entity (Gen_Unit);
2849 while Present (E) loop
2850 if Is_Subprogram (E)
2851 and then Is_Inlined (E)
2861 end Might_Inline_Subp;
2863 -- Start of processing for Analyze_Package_Instantiation
2866 -- Very first thing: apply the special kludge for Text_IO processing
2867 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2869 Text_IO_Kludge (Name (N));
2871 -- Make node global for error reporting
2873 Instantiation_Node := N;
2875 -- Case of instantiation of a generic package
2877 if Nkind (N) = N_Package_Instantiation then
2878 Act_Decl_Id := New_Copy (Defining_Entity (N));
2879 Set_Comes_From_Source (Act_Decl_Id, True);
2881 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2883 Make_Defining_Program_Unit_Name (Loc,
2884 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2885 Defining_Identifier => Act_Decl_Id);
2887 Act_Decl_Name := Act_Decl_Id;
2890 -- Case of instantiation of a formal package
2893 Act_Decl_Id := Defining_Identifier (N);
2894 Act_Decl_Name := Act_Decl_Id;
2897 Generate_Definition (Act_Decl_Id);
2898 Pre_Analyze_Actuals (N);
2901 Env_Installed := True;
2902 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2903 Gen_Unit := Entity (Gen_Id);
2905 -- Verify that it is the name of a generic package
2907 if Etype (Gen_Unit) = Any_Type then
2911 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2913 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2915 if From_With_Type (Gen_Unit) then
2917 ("cannot instantiate a limited withed package", Gen_Id);
2920 ("expect name of generic package in instantiation", Gen_Id);
2927 if In_Extended_Main_Source_Unit (N) then
2928 Set_Is_Instantiated (Gen_Unit);
2929 Generate_Reference (Gen_Unit, N);
2931 if Present (Renamed_Object (Gen_Unit)) then
2932 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2933 Generate_Reference (Renamed_Object (Gen_Unit), N);
2937 if Nkind (Gen_Id) = N_Identifier
2938 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2941 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2943 elsif Nkind (Gen_Id) = N_Expanded_Name
2944 and then Is_Child_Unit (Gen_Unit)
2945 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2946 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2949 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2952 Set_Entity (Gen_Id, Gen_Unit);
2954 -- If generic is a renaming, get original generic unit
2956 if Present (Renamed_Object (Gen_Unit))
2957 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2959 Gen_Unit := Renamed_Object (Gen_Unit);
2962 -- Verify that there are no circular instantiations
2964 if In_Open_Scopes (Gen_Unit) then
2965 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2969 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2970 Error_Msg_Node_2 := Current_Scope;
2972 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2973 Circularity_Detected := True;
2978 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2980 -- Initialize renamings map, for error checking, and the list that
2981 -- holds private entities whose views have changed between generic
2982 -- definition and instantiation. If this is the instance created to
2983 -- validate an actual package, the instantiation environment is that
2984 -- of the enclosing instance.
2986 Generic_Renamings.Set_Last (0);
2987 Generic_Renamings_HTable.Reset;
2989 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2991 -- Copy original generic tree, to produce text for instantiation
2995 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2997 Act_Spec := Specification (Act_Tree);
2999 -- If this is the instance created to validate an actual package,
3000 -- only the formals matter, do not examine the package spec itself.
3002 if Is_Actual_Pack then
3003 Set_Visible_Declarations (Act_Spec, New_List);
3004 Set_Private_Declarations (Act_Spec, New_List);
3008 Analyze_Associations
3010 Generic_Formal_Declarations (Act_Tree),
3011 Generic_Formal_Declarations (Gen_Decl));
3013 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3014 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3015 Set_Is_Generic_Instance (Act_Decl_Id);
3017 Set_Generic_Parent (Act_Spec, Gen_Unit);
3019 -- References to the generic in its own declaration or its body are
3020 -- references to the instance. Add a renaming declaration for the
3021 -- generic unit itself. This declaration, as well as the renaming
3022 -- declarations for the generic formals, must remain private to the
3023 -- unit: the formals, because this is the language semantics, and
3024 -- the unit because its use is an artifact of the implementation.
3027 Make_Package_Renaming_Declaration (Loc,
3028 Defining_Unit_Name =>
3029 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3030 Name => New_Reference_To (Act_Decl_Id, Loc));
3032 Append (Unit_Renaming, Renaming_List);
3034 -- The renaming declarations are the first local declarations of
3037 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3039 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3041 Set_Visible_Declarations (Act_Spec, Renaming_List);
3045 Make_Package_Declaration (Loc,
3046 Specification => Act_Spec);
3048 -- Save the instantiation node, for subsequent instantiation of the
3049 -- body, if there is one and we are generating code for the current
3050 -- unit. Mark the unit as having a body, to avoid a premature error
3053 -- We instantiate the body if we are generating code, if we are
3054 -- generating cross-reference information, or if we are building
3055 -- trees for ASIS use.
3058 Enclosing_Body_Present : Boolean := False;
3059 -- If the generic unit is not a compilation unit, then a body may
3060 -- be present in its parent even if none is required. We create a
3061 -- tentative pending instantiation for the body, which will be
3062 -- discarded if none is actually present.
3067 if Scope (Gen_Unit) /= Standard_Standard
3068 and then not Is_Child_Unit (Gen_Unit)
3070 Scop := Scope (Gen_Unit);
3072 while Present (Scop)
3073 and then Scop /= Standard_Standard
3075 if Unit_Requires_Body (Scop) then
3076 Enclosing_Body_Present := True;
3079 elsif In_Open_Scopes (Scop)
3080 and then In_Package_Body (Scop)
3082 Enclosing_Body_Present := True;
3086 exit when Is_Compilation_Unit (Scop);
3087 Scop := Scope (Scop);
3091 -- If front-end inlining is enabled, and this is a unit for which
3092 -- code will be generated, we instantiate the body at once.
3094 -- This is done if the instance is not the main unit, and if the
3095 -- generic is not a child unit of another generic, to avoid scope
3096 -- problems and the reinstallation of parent instances.
3099 and then (not Is_Child_Unit (Gen_Unit)
3100 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3101 and then Might_Inline_Subp
3102 and then not Is_Actual_Pack
3104 if Front_End_Inlining
3105 and then (Is_In_Main_Unit (N)
3106 or else In_Main_Context (Current_Scope))
3107 and then Nkind (Parent (N)) /= N_Compilation_Unit
3111 -- In configurable_run_time mode we force the inlining of
3112 -- predefined subprogram marked Inline_Always, to minimize
3113 -- the use of the run-time library.
3115 elsif Is_Predefined_File_Name
3116 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3117 and then Configurable_Run_Time_Mode
3118 and then Nkind (Parent (N)) /= N_Compilation_Unit
3123 -- If the current scope is itself an instance within a child
3124 -- unit,there will be duplications in the scope stack, and the
3125 -- unstacking mechanism in Inline_Instance_Body will fail.
3126 -- This loses some rare cases of optimization, and might be
3127 -- improved some day, if we can find a proper abstraction for
3128 -- "the complete compilation context" that can be saved and
3131 if Is_Generic_Instance (Current_Scope) then
3133 Curr_Unit : constant Entity_Id :=
3134 Cunit_Entity (Current_Sem_Unit);
3136 if Curr_Unit /= Current_Scope
3137 and then Is_Child_Unit (Curr_Unit)
3139 Inline_Now := False;
3146 (Unit_Requires_Body (Gen_Unit)
3147 or else Enclosing_Body_Present
3148 or else Present (Corresponding_Body (Gen_Decl)))
3149 and then (Is_In_Main_Unit (N)
3150 or else Might_Inline_Subp)
3151 and then not Is_Actual_Pack
3152 and then not Inline_Now
3153 and then (Operating_Mode = Generate_Code
3154 or else (Operating_Mode = Check_Semantics
3155 and then ASIS_Mode));
3157 -- If front_end_inlining is enabled, do not instantiate body if
3158 -- within a generic context.
3160 if (Front_End_Inlining
3161 and then not Expander_Active)
3162 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3164 Needs_Body := False;
3167 -- If the current context is generic, and the package being
3168 -- instantiated is declared within a formal package, there is no
3169 -- body to instantiate until the enclosing generic is instantiated
3170 -- and there is an actual for the formal package. If the formal
3171 -- package has parameters, we build regular package instance for
3172 -- it, that preceeds the original formal package declaration.
3174 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3176 Decl : constant Node_Id :=
3178 (Unit_Declaration_Node (Scope (Gen_Unit)));
3180 if Nkind (Decl) = N_Formal_Package_Declaration
3181 or else (Nkind (Decl) = N_Package_Declaration
3182 and then Is_List_Member (Decl)
3183 and then Present (Next (Decl))
3185 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
3187 Needs_Body := False;
3193 -- If we are generating the calling stubs from the instantiation of
3194 -- a generic RCI package, we will not use the body of the generic
3197 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3198 and then Is_Compilation_Unit (Defining_Entity (N))
3200 Needs_Body := False;
3205 -- Here is a defence against a ludicrous number of instantiations
3206 -- caused by a circular set of instantiation attempts.
3208 if Pending_Instantiations.Last >
3209 Hostparm.Max_Instantiations
3211 Error_Msg_N ("too many instantiations", N);
3212 raise Unrecoverable_Error;
3215 -- Indicate that the enclosing scopes contain an instantiation,
3216 -- and that cleanup actions should be delayed until after the
3217 -- instance body is expanded.
3219 Check_Forward_Instantiation (Gen_Decl);
3220 if Nkind (N) = N_Package_Instantiation then
3222 Enclosing_Master : Entity_Id;
3225 -- Loop to search enclosing masters
3227 Enclosing_Master := Current_Scope;
3228 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3229 if Ekind (Enclosing_Master) = E_Package then
3230 if Is_Compilation_Unit (Enclosing_Master) then
3231 if In_Package_Body (Enclosing_Master) then
3233 (Body_Entity (Enclosing_Master));
3242 Enclosing_Master := Scope (Enclosing_Master);
3245 elsif Ekind (Enclosing_Master) = E_Generic_Package then
3246 Enclosing_Master := Scope (Enclosing_Master);
3248 elsif Is_Generic_Subprogram (Enclosing_Master)
3249 or else Ekind (Enclosing_Master) = E_Void
3251 -- Cleanup actions will eventually be performed on
3252 -- the enclosing instance, if any. enclosing scope
3253 -- is void in the formal part of a generic subp.
3258 if Ekind (Enclosing_Master) = E_Entry
3260 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3262 if not Expander_Active then
3266 Protected_Body_Subprogram (Enclosing_Master);
3270 Set_Delay_Cleanups (Enclosing_Master);
3272 while Ekind (Enclosing_Master) = E_Block loop
3273 Enclosing_Master := Scope (Enclosing_Master);
3276 if Is_Subprogram (Enclosing_Master) then
3277 Delay_Descriptors (Enclosing_Master);
3279 elsif Is_Task_Type (Enclosing_Master) then
3281 TBP : constant Node_Id :=
3282 Get_Task_Body_Procedure
3285 if Present (TBP) then
3286 Delay_Descriptors (TBP);
3287 Set_Delay_Cleanups (TBP);
3294 end loop Scope_Loop;
3297 -- Make entry in table
3299 Pending_Instantiations.Increment_Last;
3300 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3301 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3305 Set_Categorization_From_Pragmas (Act_Decl);
3307 if Parent_Installed then
3311 Set_Instance_Spec (N, Act_Decl);
3313 -- If not a compilation unit, insert the package declaration
3314 -- before the original instantiation node.
3316 if Nkind (Parent (N)) /= N_Compilation_Unit then
3317 Mark_Rewrite_Insertion (Act_Decl);
3318 Insert_Before (N, Act_Decl);
3321 -- For an instantiation that is a compilation unit, place declaration
3322 -- on current node so context is complete for analysis (including
3323 -- nested instantiations). It this is the main unit, the declaration
3324 -- eventually replaces the instantiation node. If the instance body
3325 -- is later created, it replaces the instance node, and the declation
3326 -- is attached to it (see Build_Instance_Compilation_Unit_Nodes).
3329 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3331 -- The entity for the current unit is the newly created one,
3332 -- and all semantic information is attached to it.
3334 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3336 -- If this is the main unit, replace the main entity as well
3338 if Current_Sem_Unit = Main_Unit then
3339 Main_Unit_Entity := Act_Decl_Id;
3343 Set_Unit (Parent (N), Act_Decl);
3344 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3345 Set_Package_Instantiation (Act_Decl_Id, N);
3347 Set_Unit (Parent (N), N);
3348 Set_Body_Required (Parent (N), False);
3350 -- We never need elaboration checks on instantiations, since by
3351 -- definition, the body instantiation is elaborated at the same
3352 -- time as the spec instantiation.
3354 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3355 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3358 Check_Elab_Instantiation (N);
3360 if ABE_Is_Certain (N) and then Needs_Body then
3361 Pending_Instantiations.Decrement_Last;
3363 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3365 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3366 First_Private_Entity (Act_Decl_Id));
3368 -- If the instantiation will receive a body, the unit will be
3369 -- transformed into a package body, and receive its own elaboration
3370 -- entity. Otherwise, the nature of the unit is now a package
3373 if Nkind (Parent (N)) = N_Compilation_Unit
3374 and then not Needs_Body
3376 Rewrite (N, Act_Decl);
3379 if Present (Corresponding_Body (Gen_Decl))
3380 or else Unit_Requires_Body (Gen_Unit)
3382 Set_Has_Completion (Act_Decl_Id);
3385 Check_Formal_Packages (Act_Decl_Id);
3387 Restore_Private_Views (Act_Decl_Id);
3389 if not Generic_Separately_Compiled (Gen_Unit) then
3390 Inherit_Context (Gen_Decl, N);
3393 if Parent_Installed then
3398 Env_Installed := False;
3401 Validate_Categorization_Dependency (N, Act_Decl_Id);
3403 -- Check restriction, but skip this if something went wrong in the above
3404 -- analysis, indicated by Act_Decl_Id being void.
3406 if Ekind (Act_Decl_Id) /= E_Void
3407 and then not Is_Library_Level_Entity (Act_Decl_Id)
3409 Check_Restriction (No_Local_Allocators, N);
3413 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3416 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3417 -- be used as defining identifiers for a formal package and for the
3418 -- corresponding expanded package
3420 if Nkind (N) = N_Formal_Package_Declaration then
3421 Act_Decl_Id := New_Copy (Defining_Entity (N));
3422 Set_Comes_From_Source (Act_Decl_Id, True);
3423 Set_Is_Generic_Instance (Act_Decl_Id, False);
3424 Set_Defining_Identifier (N, Act_Decl_Id);
3428 when Instantiation_Error =>
3429 if Parent_Installed then
3433 if Env_Installed then
3436 end Analyze_Package_Instantiation;
3438 --------------------------
3439 -- Inline_Instance_Body --
3440 --------------------------
3442 procedure Inline_Instance_Body
3444 Gen_Unit : Entity_Id;
3448 Gen_Comp : constant Entity_Id :=
3449 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3450 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3451 Curr_Scope : Entity_Id := Empty;
3452 Curr_Unit : constant Entity_Id :=
3453 Cunit_Entity (Current_Sem_Unit);
3454 Removed : Boolean := False;
3455 Num_Scopes : Int := 0;
3457 Scope_Stack_Depth : constant Int :=
3458 Scope_Stack.Last - Scope_Stack.First + 1;
3460 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3461 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3462 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3463 Num_Inner : Int := 0;
3464 N_Instances : Int := 0;
3468 -- Case of generic unit defined in another unit. We must remove the
3469 -- complete context of the current unit to install that of the generic.
3471 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3473 -- Add some comments for the following two loops ???
3476 while Present (S) and then S /= Standard_Standard loop
3478 Num_Scopes := Num_Scopes + 1;
3480 Use_Clauses (Num_Scopes) :=
3482 (Scope_Stack.Last - Num_Scopes + 1).
3484 End_Use_Clauses (Use_Clauses (Num_Scopes));
3486 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3487 or else Scope_Stack.Table
3488 (Scope_Stack.Last - Num_Scopes).Entity
3492 exit when Is_Generic_Instance (S)
3493 and then (In_Package_Body (S)
3494 or else Ekind (S) = E_Procedure
3495 or else Ekind (S) = E_Function);
3499 Vis := Is_Immediately_Visible (Gen_Comp);
3501 -- Find and save all enclosing instances
3506 and then S /= Standard_Standard
3508 if Is_Generic_Instance (S) then
3509 N_Instances := N_Instances + 1;
3510 Instances (N_Instances) := S;
3512 exit when In_Package_Body (S);
3518 -- Remove context of current compilation unit, unless we are within a
3519 -- nested package instantiation, in which case the context has been
3520 -- removed previously.
3522 -- If current scope is the body of a child unit, remove context of
3523 -- spec as well. If an enclosing scope is an instance body. the
3524 -- context has already been removed, but the entities in the body
3525 -- must be made invisible as well.
3530 and then S /= Standard_Standard
3532 if Is_Generic_Instance (S)
3533 and then (In_Package_Body (S)
3534 or else Ekind (S) = E_Procedure
3535 or else Ekind (S) = E_Function)
3537 -- We still have to remove the entities of the enclosing
3538 -- instance from direct visibility.
3543 E := First_Entity (S);
3544 while Present (E) loop
3545 Set_Is_Immediately_Visible (E, False);
3554 or else (Ekind (Curr_Unit) = E_Package_Body
3555 and then S = Spec_Entity (Curr_Unit))
3556 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3559 (Unit_Declaration_Node (Curr_Unit)))
3563 -- Remove entities in current scopes from visibility, so that
3564 -- instance body is compiled in a clean environment.
3566 Save_Scope_Stack (Handle_Use => False);
3568 if Is_Child_Unit (S) then
3570 -- Remove child unit from stack, as well as inner scopes.
3571 -- Removing the context of a child unit removes parent units
3574 while Current_Scope /= S loop
3575 Num_Inner := Num_Inner + 1;
3576 Inner_Scopes (Num_Inner) := Current_Scope;
3581 Remove_Context (Curr_Comp);
3585 Remove_Context (Curr_Comp);
3588 if Ekind (Curr_Unit) = E_Package_Body then
3589 Remove_Context (Library_Unit (Curr_Comp));
3595 pragma Assert (Num_Inner < Num_Scopes);
3597 Push_Scope (Standard_Standard);
3598 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3599 Instantiate_Package_Body
3600 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3605 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3607 -- Reset Generic_Instance flag so that use clauses can be installed
3608 -- in the proper order. (See Use_One_Package for effect of enclosing
3609 -- instances on processing of use clauses).
3611 for J in 1 .. N_Instances loop
3612 Set_Is_Generic_Instance (Instances (J), False);
3616 Install_Context (Curr_Comp);
3618 if Present (Curr_Scope)
3619 and then Is_Child_Unit (Curr_Scope)
3621 Push_Scope (Curr_Scope);
3622 Set_Is_Immediately_Visible (Curr_Scope);
3624 -- Finally, restore inner scopes as well
3626 for J in reverse 1 .. Num_Inner loop
3627 Push_Scope (Inner_Scopes (J));
3631 Restore_Scope_Stack (Handle_Use => False);
3633 if Present (Curr_Scope)
3635 (In_Private_Part (Curr_Scope)
3636 or else In_Package_Body (Curr_Scope))
3638 -- Install private declaration of ancestor units, which are
3639 -- currently available. Restore_Scope_Stack and Install_Context
3640 -- only install the visible part of parents.
3645 Par := Scope (Curr_Scope);
3646 while (Present (Par))
3647 and then Par /= Standard_Standard
3649 Install_Private_Declarations (Par);
3656 -- Restore use clauses. For a child unit, use clauses in the parents
3657 -- are restored when installing the context, so only those in inner
3658 -- scopes (and those local to the child unit itself) need to be
3659 -- installed explicitly.
3661 if Is_Child_Unit (Curr_Unit)
3664 for J in reverse 1 .. Num_Inner + 1 loop
3665 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3667 Install_Use_Clauses (Use_Clauses (J));
3671 for J in reverse 1 .. Num_Scopes loop
3672 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3674 Install_Use_Clauses (Use_Clauses (J));
3678 -- Restore status of instances. If one of them is a body, make
3679 -- its local entities visible again.
3686 for J in 1 .. N_Instances loop
3687 Inst := Instances (J);
3688 Set_Is_Generic_Instance (Inst, True);
3690 if In_Package_Body (Inst)
3691 or else Ekind (S) = E_Procedure
3692 or else Ekind (S) = E_Function
3694 E := First_Entity (Instances (J));
3695 while Present (E) loop
3696 Set_Is_Immediately_Visible (E);
3703 -- If generic unit is in current unit, current context is correct
3706 Instantiate_Package_Body
3707 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3709 end Inline_Instance_Body;
3711 -------------------------------------
3712 -- Analyze_Procedure_Instantiation --
3713 -------------------------------------
3715 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3717 Analyze_Subprogram_Instantiation (N, E_Procedure);
3718 end Analyze_Procedure_Instantiation;
3720 --------------------------------------
3721 -- Analyze_Subprogram_Instantiation --
3722 --------------------------------------
3724 procedure Analyze_Subprogram_Instantiation
3728 Loc : constant Source_Ptr := Sloc (N);
3729 Gen_Id : constant Node_Id := Name (N);
3731 Anon_Id : constant Entity_Id :=
3732 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3733 Chars => New_External_Name
3734 (Chars (Defining_Entity (N)), 'R'));
3736 Act_Decl_Id : Entity_Id;
3741 Env_Installed : Boolean := False;
3742 Gen_Unit : Entity_Id;
3744 Pack_Id : Entity_Id;
3745 Parent_Installed : Boolean := False;
3746 Renaming_List : List_Id;
3748 procedure Analyze_Instance_And_Renamings;
3749 -- The instance must be analyzed in a context that includes the mappings
3750 -- of generic parameters into actuals. We create a package declaration
3751 -- for this purpose, and a subprogram with an internal name within the
3752 -- package. The subprogram instance is simply an alias for the internal
3753 -- subprogram, declared in the current scope.
3755 ------------------------------------
3756 -- Analyze_Instance_And_Renamings --
3757 ------------------------------------
3759 procedure Analyze_Instance_And_Renamings is
3760 Def_Ent : constant Entity_Id := Defining_Entity (N);
3761 Pack_Decl : Node_Id;
3764 if Nkind (Parent (N)) = N_Compilation_Unit then
3766 -- For the case of a compilation unit, the container package has
3767 -- the same name as the instantiation, to insure that the binder
3768 -- calls the elaboration procedure with the right name. Copy the
3769 -- entity of the instance, which may have compilation level flags
3770 -- (e.g. Is_Child_Unit) set.
3772 Pack_Id := New_Copy (Def_Ent);
3775 -- Otherwise we use the name of the instantiation concatenated
3776 -- with its source position to ensure uniqueness if there are
3777 -- several instantiations with the same name.
3780 Make_Defining_Identifier (Loc,
3781 Chars => New_External_Name
3782 (Related_Id => Chars (Def_Ent),
3784 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3787 Pack_Decl := Make_Package_Declaration (Loc,
3788 Specification => Make_Package_Specification (Loc,
3789 Defining_Unit_Name => Pack_Id,
3790 Visible_Declarations => Renaming_List,
3791 End_Label => Empty));
3793 Set_Instance_Spec (N, Pack_Decl);
3794 Set_Is_Generic_Instance (Pack_Id);
3795 Set_Needs_Debug_Info (Pack_Id);
3797 -- Case of not a compilation unit
3799 if Nkind (Parent (N)) /= N_Compilation_Unit then
3800 Mark_Rewrite_Insertion (Pack_Decl);
3801 Insert_Before (N, Pack_Decl);
3802 Set_Has_Completion (Pack_Id);
3804 -- Case of an instantiation that is a compilation unit
3806 -- Place declaration on current node so context is complete for
3807 -- analysis (including nested instantiations), and for use in a
3808 -- context_clause (see Analyze_With_Clause).
3811 Set_Unit (Parent (N), Pack_Decl);
3812 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3815 Analyze (Pack_Decl);
3816 Check_Formal_Packages (Pack_Id);
3817 Set_Is_Generic_Instance (Pack_Id, False);
3819 -- Body of the enclosing package is supplied when instantiating the
3820 -- subprogram body, after semantic analysis is completed.
3822 if Nkind (Parent (N)) = N_Compilation_Unit then
3824 -- Remove package itself from visibility, so it does not
3825 -- conflict with subprogram.
3827 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3829 -- Set name and scope of internal subprogram so that the proper
3830 -- external name will be generated. The proper scope is the scope
3831 -- of the wrapper package. We need to generate debugging info for
3832 -- the internal subprogram, so set flag accordingly.
3834 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3835 Set_Scope (Anon_Id, Scope (Pack_Id));
3837 -- Mark wrapper package as referenced, to avoid spurious warnings
3838 -- if the instantiation appears in various with_ clauses of
3839 -- subunits of the main unit.
3841 Set_Referenced (Pack_Id);
3844 Set_Is_Generic_Instance (Anon_Id);
3845 Set_Needs_Debug_Info (Anon_Id);
3846 Act_Decl_Id := New_Copy (Anon_Id);
3848 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3849 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3850 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3851 Set_Comes_From_Source (Act_Decl_Id, True);
3853 -- The signature may involve types that are not frozen yet, but the
3854 -- subprogram will be frozen at the point the wrapper package is
3855 -- frozen, so it does not need its own freeze node. In fact, if one
3856 -- is created, it might conflict with the freezing actions from the
3857 -- wrapper package (see 7206-013).
3859 -- Should not really reference non-public TN's in comments ???
3861 Set_Has_Delayed_Freeze (Anon_Id, False);
3863 -- If the instance is a child unit, mark the Id accordingly. Mark
3864 -- the anonymous entity as well, which is the real subprogram and
3865 -- which is used when the instance appears in a context clause.
3867 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3868 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3869 New_Overloaded_Entity (Act_Decl_Id);
3870 Check_Eliminated (Act_Decl_Id);
3872 -- In compilation unit case, kill elaboration checks on the
3873 -- instantiation, since they are never needed -- the body is
3874 -- instantiated at the same point as the spec.
3876 if Nkind (Parent (N)) = N_Compilation_Unit then
3877 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3878 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3879 Set_Is_Compilation_Unit (Anon_Id);
3881 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3884 -- The instance is not a freezing point for the new subprogram
3886 Set_Is_Frozen (Act_Decl_Id, False);
3888 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3889 Valid_Operator_Definition (Act_Decl_Id);
3892 Set_Alias (Act_Decl_Id, Anon_Id);
3893 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3894 Set_Has_Completion (Act_Decl_Id);
3895 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3897 if Nkind (Parent (N)) = N_Compilation_Unit then
3898 Set_Body_Required (Parent (N), False);
3901 end Analyze_Instance_And_Renamings;
3903 -- Start of processing for Analyze_Subprogram_Instantiation
3906 -- Very first thing: apply the special kludge for Text_IO processing
3907 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3908 -- Of course such an instantiation is bogus (these are packages, not
3909 -- subprograms), but we get a better error message if we do this.
3911 Text_IO_Kludge (Gen_Id);
3913 -- Make node global for error reporting
3915 Instantiation_Node := N;
3916 Pre_Analyze_Actuals (N);
3919 Env_Installed := True;
3920 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3921 Gen_Unit := Entity (Gen_Id);
3923 Generate_Reference (Gen_Unit, Gen_Id);
3925 if Nkind (Gen_Id) = N_Identifier
3926 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3929 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3932 if Etype (Gen_Unit) = Any_Type then
3937 -- Verify that it is a generic subprogram of the right kind, and that
3938 -- it does not lead to a circular instantiation.
3940 if Ekind (Gen_Unit) /= E_Generic_Procedure
3941 and then Ekind (Gen_Unit) /= E_Generic_Function
3943 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3945 elsif In_Open_Scopes (Gen_Unit) then
3946 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3948 elsif K = E_Procedure
3949 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3951 if Ekind (Gen_Unit) = E_Generic_Function then
3953 ("cannot instantiate generic function as procedure", Gen_Id);
3956 ("expect name of generic procedure in instantiation", Gen_Id);
3959 elsif K = E_Function
3960 and then Ekind (Gen_Unit) /= E_Generic_Function
3962 if Ekind (Gen_Unit) = E_Generic_Procedure then
3964 ("cannot instantiate generic procedure as function", Gen_Id);
3967 ("expect name of generic function in instantiation", Gen_Id);
3971 Set_Entity (Gen_Id, Gen_Unit);
3972 Set_Is_Instantiated (Gen_Unit);
3974 if In_Extended_Main_Source_Unit (N) then
3975 Generate_Reference (Gen_Unit, N);
3978 -- If renaming, get original unit
3980 if Present (Renamed_Object (Gen_Unit))
3981 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3983 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3985 Gen_Unit := Renamed_Object (Gen_Unit);
3986 Set_Is_Instantiated (Gen_Unit);
3987 Generate_Reference (Gen_Unit, N);
3990 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3991 Error_Msg_Node_2 := Current_Scope;
3993 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3994 Circularity_Detected := True;
3998 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4000 -- Initialize renamings map, for error checking
4002 Generic_Renamings.Set_Last (0);
4003 Generic_Renamings_HTable.Reset;
4005 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4007 -- Copy original generic tree, to produce text for instantiation
4011 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4013 Act_Spec := Specification (Act_Tree);
4015 Analyze_Associations
4017 Generic_Formal_Declarations (Act_Tree),
4018 Generic_Formal_Declarations (Gen_Decl));
4020 -- The subprogram itself cannot contain a nested instance, so the
4021 -- current parent is left empty.
4023 Set_Instance_Env (Gen_Unit, Empty);
4025 -- Build the subprogram declaration, which does not appear in the
4026 -- generic template, and give it a sloc consistent with that of the
4029 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4030 Set_Generic_Parent (Act_Spec, Gen_Unit);
4032 Make_Subprogram_Declaration (Sloc (Act_Spec),
4033 Specification => Act_Spec);
4035 Set_Categorization_From_Pragmas (Act_Decl);
4037 if Parent_Installed then
4041 Append (Act_Decl, Renaming_List);
4042 Analyze_Instance_And_Renamings;
4044 -- If the generic is marked Import (Intrinsic), then so is the
4045 -- instance. This indicates that there is no body to instantiate. If
4046 -- generic is marked inline, so it the instance, and the anonymous
4047 -- subprogram it renames. If inlined, or else if inlining is enabled
4048 -- for the compilation, we generate the instance body even if it is
4049 -- not within the main unit.
4051 -- Any other pragmas might also be inherited ???
4053 if Is_Intrinsic_Subprogram (Gen_Unit) then
4054 Set_Is_Intrinsic_Subprogram (Anon_Id);
4055 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4057 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4058 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4062 Generate_Definition (Act_Decl_Id);
4064 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4065 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4067 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4068 Check_Elab_Instantiation (N);
4071 if Is_Dispatching_Operation (Act_Decl_Id)
4072 and then Ada_Version >= Ada_05
4078 Formal := First_Formal (Act_Decl_Id);
4079 while Present (Formal) loop
4080 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4081 and then Is_Controlling_Formal (Formal)
4082 and then not Can_Never_Be_Null (Formal)
4084 Error_Msg_NE ("access parameter& is controlling,",
4086 Error_Msg_NE ("\corresponding parameter of & must be"
4087 & " explicitly null-excluding", N, Gen_Id);
4090 Next_Formal (Formal);
4095 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4097 -- Subject to change, pending on if other pragmas are inherited ???
4099 Validate_Categorization_Dependency (N, Act_Decl_Id);
4101 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4102 if not Generic_Separately_Compiled (Gen_Unit) then
4103 Inherit_Context (Gen_Decl, N);
4106 Restore_Private_Views (Pack_Id, False);
4108 -- If the context requires a full instantiation, mark node for
4109 -- subsequent construction of the body.
4111 if (Is_In_Main_Unit (N)
4112 or else Is_Inlined (Act_Decl_Id))
4113 and then (Operating_Mode = Generate_Code
4114 or else (Operating_Mode = Check_Semantics
4115 and then ASIS_Mode))
4116 and then (Expander_Active or else ASIS_Mode)
4117 and then not ABE_Is_Certain (N)
4118 and then not Is_Eliminated (Act_Decl_Id)
4120 Pending_Instantiations.Increment_Last;
4121 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
4122 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
4123 Check_Forward_Instantiation (Gen_Decl);
4125 -- The wrapper package is always delayed, because it does not
4126 -- constitute a freeze point, but to insure that the freeze
4127 -- node is placed properly, it is created directly when
4128 -- instantiating the body (otherwise the freeze node might
4129 -- appear to early for nested instantiations).
4131 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4133 -- For ASIS purposes, indicate that the wrapper package has
4134 -- replaced the instantiation node.
4136 Rewrite (N, Unit (Parent (N)));
4137 Set_Unit (Parent (N), N);
4140 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4142 -- Replace instance node for library-level instantiations of
4143 -- intrinsic subprograms, for ASIS use.
4145 Rewrite (N, Unit (Parent (N)));
4146 Set_Unit (Parent (N), N);
4149 if Parent_Installed then
4154 Env_Installed := False;
4155 Generic_Renamings.Set_Last (0);
4156 Generic_Renamings_HTable.Reset;
4160 when Instantiation_Error =>
4161 if Parent_Installed then
4165 if Env_Installed then
4168 end Analyze_Subprogram_Instantiation;
4170 -------------------------
4171 -- Get_Associated_Node --
4172 -------------------------
4174 function Get_Associated_Node (N : Node_Id) return Node_Id is
4175 Assoc : Node_Id := Associated_Node (N);
4178 if Nkind (Assoc) /= Nkind (N) then
4181 elsif Nkind (Assoc) = N_Aggregate
4182 or else Nkind (Assoc) = N_Extension_Aggregate
4187 -- If the node is part of an inner generic, it may itself have been
4188 -- remapped into a further generic copy. Associated_Node is otherwise
4189 -- used for the entity of the node, and will be of a different node
4190 -- kind, or else N has been rewritten as a literal or function call.
4192 while Present (Associated_Node (Assoc))
4193 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4195 Assoc := Associated_Node (Assoc);
4198 -- Follow and additional link in case the final node was rewritten.
4199 -- This can only happen with nested generic units.
4201 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4202 and then Present (Associated_Node (Assoc))
4203 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
4205 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
4207 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
4209 Nkind (Associated_Node (Assoc)) = N_Real_Literal
4211 Nkind (Associated_Node (Assoc)) = N_String_Literal)
4213 Assoc := Associated_Node (Assoc);
4218 end Get_Associated_Node;
4220 -------------------------------------------
4221 -- Build_Instance_Compilation_Unit_Nodes --
4222 -------------------------------------------
4224 procedure Build_Instance_Compilation_Unit_Nodes
4229 Decl_Cunit : Node_Id;
4230 Body_Cunit : Node_Id;
4232 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4233 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4236 -- A new compilation unit node is built for the instance declaration
4239 Make_Compilation_Unit (Sloc (N),
4240 Context_Items => Empty_List,
4243 Make_Compilation_Unit_Aux (Sloc (N)));
4245 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4246 Set_Body_Required (Decl_Cunit, True);
4248 -- We use the original instantiation compilation unit as the resulting
4249 -- compilation unit of the instance, since this is the main unit.
4251 Rewrite (N, Act_Body);
4252 Body_Cunit := Parent (N);
4254 -- The two compilation unit nodes are linked by the Library_Unit field
4256 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4257 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4259 -- Preserve the private nature of the package if needed
4261 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4263 -- If the instance is not the main unit, its context, categorization,
4264 -- and elaboration entity are not relevant to the compilation.
4266 if Parent (N) /= Cunit (Main_Unit) then
4270 -- The context clause items on the instantiation, which are now attached
4271 -- to the body compilation unit (since the body overwrote the original
4272 -- instantiation node), semantically belong on the spec, so copy them
4273 -- there. It's harmless to leave them on the body as well. In fact one
4274 -- could argue that they belong in both places.
4276 Citem := First (Context_Items (Body_Cunit));
4277 while Present (Citem) loop
4278 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4282 -- Propagate categorization flags on packages, so that they appear in
4283 -- the ali file for the spec of the unit.
4285 if Ekind (New_Main) = E_Package then
4286 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4287 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4288 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4289 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4290 Set_Is_Remote_Call_Interface
4291 (Old_Main, Is_Remote_Call_Interface (New_Main));
4294 -- Make entry in Units table, so that binder can generate call to
4295 -- elaboration procedure for body, if any.
4297 Make_Instance_Unit (Body_Cunit);
4298 Main_Unit_Entity := New_Main;
4299 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4301 -- Build elaboration entity, since the instance may certainly generate
4302 -- elaboration code requiring a flag for protection.
4304 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4305 end Build_Instance_Compilation_Unit_Nodes;
4307 -----------------------------
4308 -- Check_Access_Definition --
4309 -----------------------------
4311 procedure Check_Access_Definition (N : Node_Id) is
4314 (Ada_Version >= Ada_05
4315 and then Present (Access_Definition (N)));
4317 end Check_Access_Definition;
4319 -----------------------------------
4320 -- Check_Formal_Package_Instance --
4321 -----------------------------------
4323 -- If the formal has specific parameters, they must match those of the
4324 -- actual. Both of them are instances, and the renaming declarations for
4325 -- their formal parameters appear in the same order in both. The analyzed
4326 -- formal has been analyzed in the context of the current instance.
4328 procedure Check_Formal_Package_Instance
4329 (Formal_Pack : Entity_Id;
4330 Actual_Pack : Entity_Id)
4332 E1 : Entity_Id := First_Entity (Actual_Pack);
4333 E2 : Entity_Id := First_Entity (Formal_Pack);
4338 procedure Check_Mismatch (B : Boolean);
4339 -- Common error routine for mismatch between the parameters of the
4340 -- actual instance and those of the formal package.
4342 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4343 -- The formal may come from a nested formal package, and the actual may
4344 -- have been constant-folded. To determine whether the two denote the
4345 -- same entity we may have to traverse several definitions to recover
4346 -- the ultimate entity that they refer to.
4348 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4349 -- Similarly, if the formal comes from a nested formal package, the
4350 -- actual may designate the formal through multiple renamings, which
4351 -- have to be followed to determine the original variable in question.
4353 --------------------
4354 -- Check_Mismatch --
4355 --------------------
4357 procedure Check_Mismatch (B : Boolean) is
4358 Kind : constant Node_Kind := Nkind (Parent (E2));
4361 if Kind = N_Formal_Type_Declaration then
4364 elsif Kind = N_Formal_Object_Declaration
4365 or else Kind in N_Formal_Subprogram_Declaration
4366 or else Kind = N_Formal_Package_Declaration
4372 ("actual for & in actual instance does not match formal",
4373 Parent (Actual_Pack), E1);
4377 --------------------------------
4378 -- Same_Instantiated_Constant --
4379 --------------------------------
4381 function Same_Instantiated_Constant
4382 (E1, E2 : Entity_Id) return Boolean
4388 while Present (Ent) loop
4392 elsif Ekind (Ent) /= E_Constant then
4395 elsif Is_Entity_Name (Constant_Value (Ent)) then
4396 if Entity (Constant_Value (Ent)) = E1 then
4399 Ent := Entity (Constant_Value (Ent));
4402 -- The actual may be a constant that has been folded. Recover
4405 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4406 Ent := Entity (Original_Node (Constant_Value (Ent)));
4413 end Same_Instantiated_Constant;
4415 --------------------------------
4416 -- Same_Instantiated_Variable --
4417 --------------------------------
4419 function Same_Instantiated_Variable
4420 (E1, E2 : Entity_Id) return Boolean
4422 function Original_Entity (E : Entity_Id) return Entity_Id;
4423 -- Follow chain of renamings to the ultimate ancestor
4425 ---------------------
4426 -- Original_Entity --
4427 ---------------------
4429 function Original_Entity (E : Entity_Id) return Entity_Id is
4434 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4435 and then Present (Renamed_Object (Orig))
4436 and then Is_Entity_Name (Renamed_Object (Orig))
4438 Orig := Entity (Renamed_Object (Orig));
4442 end Original_Entity;
4444 -- Start of processing for Same_Instantiated_Variable
4447 return Ekind (E1) = Ekind (E2)
4448 and then Original_Entity (E1) = Original_Entity (E2);
4449 end Same_Instantiated_Variable;
4451 -- Start of processing for Check_Formal_Package_Instance
4455 and then Present (E2)
4457 exit when Ekind (E1) = E_Package
4458 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4460 -- If the formal is the renaming of the formal package, this
4461 -- is the end of its formal part, which may occur before the
4462 -- end of the formal part in the actual in the presence of
4463 -- defaulted parameters in the formal package.
4465 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4466 and then Renamed_Entity (E2) = Scope (E2);
4468 -- The analysis of the actual may generate additional internal
4469 -- entities. If the formal is defaulted, there is no corresponding
4470 -- analysis and the internal entities must be skipped, until we
4471 -- find corresponding entities again.
4473 if Comes_From_Source (E2)
4474 and then not Comes_From_Source (E1)
4475 and then Chars (E1) /= Chars (E2)
4478 and then Chars (E1) /= Chars (E2)
4487 -- If the formal entity comes from a formal declaration. it was
4488 -- defaulted in the formal package, and no check is needed on it.
4490 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4493 elsif Is_Type (E1) then
4495 -- Subtypes must statically match. E1, E2 are the local entities
4496 -- that are subtypes of the actuals. Itypes generated for other
4497 -- parameters need not be checked, the check will be performed
4498 -- on the parameters themselves.
4500 -- If E2 is a formal type declaration, it is a defaulted parameter
4501 -- and needs no checking.
4503 if not Is_Itype (E1)
4504 and then not Is_Itype (E2)
4508 or else Etype (E1) /= Etype (E2)
4509 or else not Subtypes_Statically_Match (E1, E2));
4512 elsif Ekind (E1) = E_Constant then
4514 -- IN parameters must denote the same static value, or the same
4515 -- constant, or the literal null.
4517 Expr1 := Expression (Parent (E1));
4519 if Ekind (E2) /= E_Constant then
4520 Check_Mismatch (True);
4523 Expr2 := Expression (Parent (E2));
4526 if Is_Static_Expression (Expr1) then
4528 if not Is_Static_Expression (Expr2) then
4529 Check_Mismatch (True);
4531 elsif Is_Discrete_Type (Etype (E1)) then
4533 V1 : constant Uint := Expr_Value (Expr1);
4534 V2 : constant Uint := Expr_Value (Expr2);
4536 Check_Mismatch (V1 /= V2);
4539 elsif Is_Real_Type (Etype (E1)) then
4541 V1 : constant Ureal := Expr_Value_R (Expr1);
4542 V2 : constant Ureal := Expr_Value_R (Expr2);
4544 Check_Mismatch (V1 /= V2);
4547 elsif Is_String_Type (Etype (E1))
4548 and then Nkind (Expr1) = N_String_Literal
4550 if Nkind (Expr2) /= N_String_Literal then
4551 Check_Mismatch (True);
4554 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4558 elsif Is_Entity_Name (Expr1) then
4559 if Is_Entity_Name (Expr2) then
4560 if Entity (Expr1) = Entity (Expr2) then
4564 (not Same_Instantiated_Constant
4565 (Entity (Expr1), Entity (Expr2)));
4568 Check_Mismatch (True);
4571 elsif Is_Entity_Name (Original_Node (Expr1))
4572 and then Is_Entity_Name (Expr2)
4574 Same_Instantiated_Constant
4575 (Entity (Original_Node (Expr1)), Entity (Expr2))
4579 elsif Nkind (Expr1) = N_Null then
4580 Check_Mismatch (Nkind (Expr1) /= N_Null);
4583 Check_Mismatch (True);
4586 elsif Ekind (E1) = E_Variable then
4587 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4589 elsif Ekind (E1) = E_Package then
4591 (Ekind (E1) /= Ekind (E2)
4592 or else Renamed_Object (E1) /= Renamed_Object (E2));
4594 elsif Is_Overloadable (E1) then
4596 -- Verify that the names of the entities match. Note that actuals
4597 -- that are attributes are rewritten as subprograms.
4600 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
4603 raise Program_Error;
4610 end Check_Formal_Package_Instance;
4612 ---------------------------
4613 -- Check_Formal_Packages --
4614 ---------------------------
4616 procedure Check_Formal_Packages (P_Id : Entity_Id) is
4618 Formal_P : Entity_Id;
4621 -- Iterate through the declarations in the instance, looking for package
4622 -- renaming declarations that denote instances of formal packages. Stop
4623 -- when we find the renaming of the current package itself. The
4624 -- declaration for a formal package without a box is followed by an
4625 -- internal entity that repeats the instantiation.
4627 E := First_Entity (P_Id);
4628 while Present (E) loop
4629 if Ekind (E) = E_Package then
4630 if Renamed_Object (E) = P_Id then
4633 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4636 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
4637 Formal_P := Next_Entity (E);
4638 Check_Formal_Package_Instance (Formal_P, E);
4640 -- After checking, remove the internal validating package. It
4641 -- is only needed for semantic checks, and as it may contain
4642 -- generic formal declarations it should not reach gigi.
4644 Remove (Unit_Declaration_Node (Formal_P));
4650 end Check_Formal_Packages;
4652 ---------------------------------
4653 -- Check_Forward_Instantiation --
4654 ---------------------------------
4656 procedure Check_Forward_Instantiation (Decl : Node_Id) is
4658 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
4661 -- The instantiation appears before the generic body if we are in the
4662 -- scope of the unit containing the generic, either in its spec or in
4663 -- the package body. and before the generic body.
4665 if Ekind (Gen_Comp) = E_Package_Body then
4666 Gen_Comp := Spec_Entity (Gen_Comp);
4669 if In_Open_Scopes (Gen_Comp)
4670 and then No (Corresponding_Body (Decl))
4675 and then not Is_Compilation_Unit (S)
4676 and then not Is_Child_Unit (S)
4678 if Ekind (S) = E_Package then
4679 Set_Has_Forward_Instantiation (S);
4685 end Check_Forward_Instantiation;
4687 ---------------------------
4688 -- Check_Generic_Actuals --
4689 ---------------------------
4691 -- The visibility of the actuals may be different between the point of
4692 -- generic instantiation and the instantiation of the body.
4694 procedure Check_Generic_Actuals
4695 (Instance : Entity_Id;
4696 Is_Formal_Box : Boolean)
4701 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
4702 -- For a formal that is an array type, the component type is often a
4703 -- previous formal in the same unit. The privacy status of the component
4704 -- type will have been examined earlier in the traversal of the
4705 -- corresponding actuals, and this status should not be modified for the
4706 -- array type itself.
4708 -- To detect this case we have to rescan the list of formals, which
4709 -- is usually short enough to ignore the resulting inefficiency.
4711 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
4714 Prev := First_Entity (Instance);
4715 while Present (Prev) loop
4717 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
4718 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
4719 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
4729 end Denotes_Previous_Actual;
4731 -- Start of processing for Check_Generic_Actuals
4734 E := First_Entity (Instance);
4735 while Present (E) loop
4737 and then Nkind (Parent (E)) = N_Subtype_Declaration
4738 and then Scope (Etype (E)) /= Instance
4739 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
4741 if Is_Array_Type (E)
4742 and then Denotes_Previous_Actual (Component_Type (E))
4746 Check_Private_View (Subtype_Indication (Parent (E)));
4748 Set_Is_Generic_Actual_Type (E, True);
4749 Set_Is_Hidden (E, False);
4750 Set_Is_Potentially_Use_Visible (E,
4753 -- We constructed the generic actual type as a subtype of the
4754 -- supplied type. This means that it normally would not inherit
4755 -- subtype specific attributes of the actual, which is wrong for
4756 -- the generic case.
4758 Astype := Ancestor_Subtype (E);
4762 -- This can happen when E is an itype that is the full view of
4763 -- a private type completed, e.g. with a constrained array. In
4764 -- that case, use the first subtype, which will carry size
4765 -- information. The base type itself is unconstrained and will
4768 Astype := First_Subtype (E);
4771 Set_Size_Info (E, (Astype));
4772 Set_RM_Size (E, RM_Size (Astype));
4773 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4775 if Is_Discrete_Or_Fixed_Point_Type (E) then
4776 Set_RM_Size (E, RM_Size (Astype));
4778 -- In nested instances, the base type of an access actual
4779 -- may itself be private, and need to be exchanged.
4781 elsif Is_Access_Type (E)
4782 and then Is_Private_Type (Etype (E))
4785 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4788 elsif Ekind (E) = E_Package then
4790 -- If this is the renaming for the current instance, we're done.
4791 -- Otherwise it is a formal package. If the corresponding formal
4792 -- was declared with a box, the (instantiations of the) generic
4793 -- formal part are also visible. Otherwise, ignore the entity
4794 -- created to validate the actuals.
4796 if Renamed_Object (E) = Instance then
4799 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4802 -- The visibility of a formal of an enclosing generic is already
4805 elsif Denotes_Formal_Package (E) then
4808 elsif Present (Associated_Formal_Package (E))
4809 and then not Is_Generic_Formal (E)
4811 if Box_Present (Parent (Associated_Formal_Package (E))) then
4812 Check_Generic_Actuals (Renamed_Object (E), True);
4815 Check_Generic_Actuals (Renamed_Object (E), False);
4818 Set_Is_Hidden (E, False);
4821 -- If this is a subprogram instance (in a wrapper package) the
4822 -- actual is fully visible.
4824 elsif Is_Wrapper_Package (Instance) then
4825 Set_Is_Hidden (E, False);
4827 -- If the formal package is declared with a box, or if the formal
4828 -- parameter is defaulted, it is visible in the body.
4831 or else Is_Visible_Formal (E)
4833 Set_Is_Hidden (E, False);
4838 end Check_Generic_Actuals;
4840 ------------------------------
4841 -- Check_Generic_Child_Unit --
4842 ------------------------------
4844 procedure Check_Generic_Child_Unit
4846 Parent_Installed : in out Boolean)
4848 Loc : constant Source_Ptr := Sloc (Gen_Id);
4849 Gen_Par : Entity_Id := Empty;
4850 Inst_Par : Entity_Id;
4854 function Find_Generic_Child
4856 Id : Node_Id) return Entity_Id;
4857 -- Search generic parent for possible child unit with the given name
4859 function In_Enclosing_Instance return Boolean;
4860 -- Within an instance of the parent, the child unit may be denoted
4861 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4862 -- scopes to locate a possible parent instantiation.
4864 ------------------------
4865 -- Find_Generic_Child --
4866 ------------------------
4868 function Find_Generic_Child
4870 Id : Node_Id) return Entity_Id
4875 -- If entity of name is already set, instance has already been
4876 -- resolved, e.g. in an enclosing instantiation.
4878 if Present (Entity (Id)) then
4879 if Scope (Entity (Id)) = Scop then
4886 E := First_Entity (Scop);
4887 while Present (E) loop
4888 if Chars (E) = Chars (Id)
4889 and then Is_Child_Unit (E)
4891 if Is_Child_Unit (E)
4892 and then not Is_Visible_Child_Unit (E)
4895 ("generic child unit& is not visible", Gen_Id, E);
4907 end Find_Generic_Child;
4909 ---------------------------
4910 -- In_Enclosing_Instance --
4911 ---------------------------
4913 function In_Enclosing_Instance return Boolean is
4914 Enclosing_Instance : Node_Id;
4915 Instance_Decl : Node_Id;
4918 -- We do not inline any call that contains instantiations, except
4919 -- for instantiations of Unchecked_Conversion, so if we are within
4920 -- an inlined body the current instance does not require parents.
4922 if In_Inlined_Body then
4923 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
4927 -- Loop to check enclosing scopes
4929 Enclosing_Instance := Current_Scope;
4930 while Present (Enclosing_Instance) loop
4931 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4933 if Ekind (Enclosing_Instance) = E_Package
4934 and then Is_Generic_Instance (Enclosing_Instance)
4936 (Generic_Parent (Specification (Instance_Decl)))
4938 -- Check whether the generic we are looking for is a child of
4941 E := Find_Generic_Child
4942 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4943 exit when Present (E);
4949 Enclosing_Instance := Scope (Enclosing_Instance);
4961 Make_Expanded_Name (Loc,
4963 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4964 Selector_Name => New_Occurrence_Of (E, Loc)));
4966 Set_Entity (Gen_Id, E);
4967 Set_Etype (Gen_Id, Etype (E));
4968 Parent_Installed := False; -- Already in scope.
4971 end In_Enclosing_Instance;
4973 -- Start of processing for Check_Generic_Child_Unit
4976 -- If the name of the generic is given by a selected component, it may
4977 -- be the name of a generic child unit, and the prefix is the name of an
4978 -- instance of the parent, in which case the child unit must be visible.
4979 -- If this instance is not in scope, it must be placed there and removed
4980 -- after instantiation, because what is being instantiated is not the
4981 -- original child, but the corresponding child present in the instance
4984 -- If the child is instantiated within the parent, it can be given by
4985 -- a simple name. In this case the instance is already in scope, but
4986 -- the child generic must be recovered from the generic parent as well.
4988 if Nkind (Gen_Id) = N_Selected_Component then
4989 S := Selector_Name (Gen_Id);
4990 Analyze (Prefix (Gen_Id));
4991 Inst_Par := Entity (Prefix (Gen_Id));
4993 if Ekind (Inst_Par) = E_Package
4994 and then Present (Renamed_Object (Inst_Par))
4996 Inst_Par := Renamed_Object (Inst_Par);
4999 if Ekind (Inst_Par) = E_Package then
5000 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5001 Gen_Par := Generic_Parent (Parent (Inst_Par));
5003 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5005 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5007 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5010 elsif Ekind (Inst_Par) = E_Generic_Package
5011 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5013 -- A formal package may be a real child package, and not the
5014 -- implicit instance within a parent. In this case the child is
5015 -- not visible and has to be retrieved explicitly as well.
5017 Gen_Par := Inst_Par;
5020 if Present (Gen_Par) then
5022 -- The prefix denotes an instantiation. The entity itself may be a
5023 -- nested generic, or a child unit.
5025 E := Find_Generic_Child (Gen_Par, S);
5028 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5029 Set_Entity (Gen_Id, E);
5030 Set_Etype (Gen_Id, Etype (E));
5032 Set_Etype (S, Etype (E));
5034 -- Indicate that this is a reference to the parent
5036 if In_Extended_Main_Source_Unit (Gen_Id) then
5037 Set_Is_Instantiated (Inst_Par);
5040 -- A common mistake is to replicate the naming scheme of a
5041 -- hierarchy by instantiating a generic child directly, rather
5042 -- than the implicit child in a parent instance:
5044 -- generic .. package Gpar is ..
5045 -- generic .. package Gpar.Child is ..
5046 -- package Par is new Gpar ();
5049 -- package Par.Child is new Gpar.Child ();
5050 -- rather than Par.Child
5052 -- In this case the instantiation is within Par, which is an
5053 -- instance, but Gpar does not denote Par because we are not IN
5054 -- the instance of Gpar, so this is illegal. The test below
5055 -- recognizes this particular case.
5057 if Is_Child_Unit (E)
5058 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5059 and then (not In_Instance
5060 or else Nkind (Parent (Parent (Gen_Id))) =
5064 ("prefix of generic child unit must be instance of parent",
5068 if not In_Open_Scopes (Inst_Par)
5069 and then Nkind (Parent (Gen_Id)) not in
5070 N_Generic_Renaming_Declaration
5072 Install_Parent (Inst_Par);
5073 Parent_Installed := True;
5075 elsif In_Open_Scopes (Inst_Par) then
5077 -- If the parent is already installed verify that the
5078 -- actuals for its formal packages declared with a box
5079 -- are already installed. This is necessary when the
5080 -- child instance is a child of the parent instance.
5081 -- In this case the parent is placed on the scope stack
5082 -- but the formal packages are not made visible.
5084 Install_Formal_Packages (Inst_Par);
5088 -- If the generic parent does not contain an entity that
5089 -- corresponds to the selector, the instance doesn't either.
5090 -- Analyzing the node will yield the appropriate error message.
5091 -- If the entity is not a child unit, then it is an inner
5092 -- generic in the parent.
5100 if Is_Child_Unit (Entity (Gen_Id))
5102 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5103 and then not In_Open_Scopes (Inst_Par)
5105 Install_Parent (Inst_Par);
5106 Parent_Installed := True;
5110 elsif Nkind (Gen_Id) = N_Expanded_Name then
5112 -- Entity already present, analyze prefix, whose meaning may be
5113 -- an instance in the current context. If it is an instance of
5114 -- a relative within another, the proper parent may still have
5115 -- to be installed, if they are not of the same generation.
5117 Analyze (Prefix (Gen_Id));
5118 Inst_Par := Entity (Prefix (Gen_Id));
5120 if In_Enclosing_Instance then
5123 elsif Present (Entity (Gen_Id))
5124 and then Is_Child_Unit (Entity (Gen_Id))
5125 and then not In_Open_Scopes (Inst_Par)
5127 Install_Parent (Inst_Par);
5128 Parent_Installed := True;
5131 elsif In_Enclosing_Instance then
5133 -- The child unit is found in some enclosing scope
5140 -- If this is the renaming of the implicit child in a parent
5141 -- instance, recover the parent name and install it.
5143 if Is_Entity_Name (Gen_Id) then
5144 E := Entity (Gen_Id);
5146 if Is_Generic_Unit (E)
5147 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5148 and then Is_Child_Unit (Renamed_Object (E))
5149 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5150 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5153 New_Copy_Tree (Name (Parent (E))));
5154 Inst_Par := Entity (Prefix (Gen_Id));
5156 if not In_Open_Scopes (Inst_Par) then
5157 Install_Parent (Inst_Par);
5158 Parent_Installed := True;
5161 -- If it is a child unit of a non-generic parent, it may be
5162 -- use-visible and given by a direct name. Install parent as
5165 elsif Is_Generic_Unit (E)
5166 and then Is_Child_Unit (E)
5168 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5169 and then not Is_Generic_Unit (Scope (E))
5171 if not In_Open_Scopes (Scope (E)) then
5172 Install_Parent (Scope (E));
5173 Parent_Installed := True;
5178 end Check_Generic_Child_Unit;
5180 -----------------------------
5181 -- Check_Hidden_Child_Unit --
5182 -----------------------------
5184 procedure Check_Hidden_Child_Unit
5186 Gen_Unit : Entity_Id;
5187 Act_Decl_Id : Entity_Id)
5189 Gen_Id : constant Node_Id := Name (N);
5192 if Is_Child_Unit (Gen_Unit)
5193 and then Is_Child_Unit (Act_Decl_Id)
5194 and then Nkind (Gen_Id) = N_Expanded_Name
5195 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5196 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5198 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5200 ("generic unit & is implicitly declared in &",
5201 Defining_Unit_Name (N), Gen_Unit);
5202 Error_Msg_N ("\instance must have different name",
5203 Defining_Unit_Name (N));
5205 end Check_Hidden_Child_Unit;
5207 ------------------------
5208 -- Check_Private_View --
5209 ------------------------
5211 procedure Check_Private_View (N : Node_Id) is
5212 T : constant Entity_Id := Etype (N);
5216 -- Exchange views if the type was not private in the generic but is
5217 -- private at the point of instantiation. Do not exchange views if
5218 -- the scope of the type is in scope. This can happen if both generic
5219 -- and instance are sibling units, or if type is defined in a parent.
5220 -- In this case the visibility of the type will be correct for all
5224 BT := Base_Type (T);
5226 if Is_Private_Type (T)
5227 and then not Has_Private_View (N)
5228 and then Present (Full_View (T))
5229 and then not In_Open_Scopes (Scope (T))
5231 -- In the generic, the full type was visible. Save the private
5232 -- entity, for subsequent exchange.
5236 elsif Has_Private_View (N)
5237 and then not Is_Private_Type (T)
5238 and then not Has_Been_Exchanged (T)
5239 and then Etype (Get_Associated_Node (N)) /= T
5241 -- Only the private declaration was visible in the generic. If
5242 -- the type appears in a subtype declaration, the subtype in the
5243 -- instance must have a view compatible with that of its parent,
5244 -- which must be exchanged (see corresponding code in Restore_
5245 -- Private_Views). Otherwise, if the type is defined in a parent
5246 -- unit, leave full visibility within instance, which is safe.
5248 if In_Open_Scopes (Scope (Base_Type (T)))
5249 and then not Is_Private_Type (Base_Type (T))
5250 and then Comes_From_Source (Base_Type (T))
5254 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5255 or else not In_Private_Part (Scope (Base_Type (T)))
5257 Prepend_Elmt (T, Exchanged_Views);
5258 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5261 -- For composite types with inconsistent representation exchange
5262 -- component types accordingly.
5264 elsif Is_Access_Type (T)
5265 and then Is_Private_Type (Designated_Type (T))
5266 and then not Has_Private_View (N)
5267 and then Present (Full_View (Designated_Type (T)))
5269 Switch_View (Designated_Type (T));
5271 elsif Is_Array_Type (T) then
5272 if Is_Private_Type (Component_Type (T))
5273 and then not Has_Private_View (N)
5274 and then Present (Full_View (Component_Type (T)))
5276 Switch_View (Component_Type (T));
5279 -- The normal exchange mechanism relies on the setting of a
5280 -- flag on the reference in the generic. However, an additional
5281 -- mechanism is needed for types that are not explicitly mentioned
5282 -- in the generic, but may be needed in expanded code in the
5283 -- instance. This includes component types of arrays and
5284 -- designated types of access types. This processing must also
5285 -- include the index types of arrays which we take care of here.
5292 Indx := First_Index (T);
5293 Typ := Base_Type (Etype (Indx));
5294 while Present (Indx) loop
5295 if Is_Private_Type (Typ)
5296 and then Present (Full_View (Typ))
5305 elsif Is_Private_Type (T)
5306 and then Present (Full_View (T))
5307 and then Is_Array_Type (Full_View (T))
5308 and then Is_Private_Type (Component_Type (Full_View (T)))
5312 -- Finally, a non-private subtype may have a private base type, which
5313 -- must be exchanged for consistency. This can happen when a package
5314 -- body is instantiated, when the scope stack is empty but in fact
5315 -- the subtype and the base type are declared in an enclosing scope.
5317 -- Note that in this case we introduce an inconsistency in the view
5318 -- set, because we switch the base type BT, but there could be some
5319 -- private dependent subtypes of BT which remain unswitched. Such
5320 -- subtypes might need to be switched at a later point (see specific
5321 -- provision for that case in Switch_View).
5323 elsif not Is_Private_Type (T)
5324 and then not Has_Private_View (N)
5325 and then Is_Private_Type (BT)
5326 and then Present (Full_View (BT))
5327 and then not Is_Generic_Type (BT)
5328 and then not In_Open_Scopes (BT)
5330 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5331 Exchange_Declarations (BT);
5334 end Check_Private_View;
5336 --------------------------
5337 -- Contains_Instance_Of --
5338 --------------------------
5340 function Contains_Instance_Of
5343 N : Node_Id) return Boolean
5351 -- Verify that there are no circular instantiations. We check whether
5352 -- the unit contains an instance of the current scope or some enclosing
5353 -- scope (in case one of the instances appears in a subunit). Longer
5354 -- circularities involving subunits might seem too pathological to
5355 -- consider, but they were not too pathological for the authors of
5356 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5357 -- enclosing generic scopes as containing an instance.
5360 -- Within a generic subprogram body, the scope is not generic, to
5361 -- allow for recursive subprograms. Use the declaration to determine
5362 -- whether this is a generic unit.
5364 if Ekind (Scop) = E_Generic_Package
5365 or else (Is_Subprogram (Scop)
5366 and then Nkind (Unit_Declaration_Node (Scop)) =
5367 N_Generic_Subprogram_Declaration)
5369 Elmt := First_Elmt (Inner_Instances (Inner));
5371 while Present (Elmt) loop
5372 if Node (Elmt) = Scop then
5373 Error_Msg_Node_2 := Inner;
5375 ("circular Instantiation: & instantiated within &!",
5379 elsif Node (Elmt) = Inner then
5382 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5383 Error_Msg_Node_2 := Inner;
5385 ("circular Instantiation: & instantiated within &!",
5393 -- Indicate that Inner is being instantiated within Scop
5395 Append_Elmt (Inner, Inner_Instances (Scop));
5398 if Scop = Standard_Standard then
5401 Scop := Scope (Scop);
5406 end Contains_Instance_Of;
5408 -----------------------
5409 -- Copy_Generic_Node --
5410 -----------------------
5412 function Copy_Generic_Node
5414 Parent_Id : Node_Id;
5415 Instantiating : Boolean) return Node_Id
5420 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5421 -- Check the given value of one of the Fields referenced by the
5422 -- current node to determine whether to copy it recursively. The
5423 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5424 -- value (Sloc, Uint, Char) in which case it need not be copied.
5426 procedure Copy_Descendants;
5427 -- Common utility for various nodes
5429 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5430 -- Make copy of element list
5432 function Copy_Generic_List
5434 Parent_Id : Node_Id) return List_Id;
5435 -- Apply Copy_Node recursively to the members of a node list
5437 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5438 -- True if an identifier is part of the defining program unit name
5439 -- of a child unit. The entity of such an identifier must be kept
5440 -- (for ASIS use) even though as the name of an enclosing generic
5441 -- it would otherwise not be preserved in the generic tree.
5443 ----------------------
5444 -- Copy_Descendants --
5445 ----------------------
5447 procedure Copy_Descendants is
5449 use Atree.Unchecked_Access;
5450 -- This code section is part of the implementation of an untyped
5451 -- tree traversal, so it needs direct access to node fields.
5454 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5455 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5456 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5457 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5458 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5459 end Copy_Descendants;
5461 -----------------------------
5462 -- Copy_Generic_Descendant --
5463 -----------------------------
5465 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5467 if D = Union_Id (Empty) then
5470 elsif D in Node_Range then
5472 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5474 elsif D in List_Range then
5475 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5477 elsif D in Elist_Range then
5478 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5480 -- Nothing else is copyable (e.g. Uint values), return as is
5485 end Copy_Generic_Descendant;
5487 ------------------------
5488 -- Copy_Generic_Elist --
5489 ------------------------
5491 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
5498 M := First_Elmt (E);
5499 while Present (M) loop
5501 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
5510 end Copy_Generic_Elist;
5512 -----------------------
5513 -- Copy_Generic_List --
5514 -----------------------
5516 function Copy_Generic_List
5518 Parent_Id : Node_Id) return List_Id
5526 Set_Parent (New_L, Parent_Id);
5529 while Present (N) loop
5530 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
5539 end Copy_Generic_List;
5541 ---------------------------
5542 -- In_Defining_Unit_Name --
5543 ---------------------------
5545 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
5547 return Present (Parent (Nam))
5548 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
5550 (Nkind (Parent (Nam)) = N_Expanded_Name
5551 and then In_Defining_Unit_Name (Parent (Nam))));
5552 end In_Defining_Unit_Name;
5554 -- Start of processing for Copy_Generic_Node
5561 New_N := New_Copy (N);
5563 if Instantiating then
5564 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
5567 if not Is_List_Member (N) then
5568 Set_Parent (New_N, Parent_Id);
5571 -- If defining identifier, then all fields have been copied already
5573 if Nkind (New_N) in N_Entity then
5576 -- Special casing for identifiers and other entity names and operators
5578 elsif Nkind (New_N) = N_Identifier
5579 or else Nkind (New_N) = N_Character_Literal
5580 or else Nkind (New_N) = N_Expanded_Name
5581 or else Nkind (New_N) = N_Operator_Symbol
5582 or else Nkind (New_N) in N_Op
5584 if not Instantiating then
5586 -- Link both nodes in order to assign subsequently the
5587 -- entity of the copy to the original node, in case this
5588 -- is a global reference.
5590 Set_Associated_Node (N, New_N);
5592 -- If we are within an instantiation, this is a nested generic
5593 -- that has already been analyzed at the point of definition. We
5594 -- must preserve references that were global to the enclosing
5595 -- parent at that point. Other occurrences, whether global or
5596 -- local to the current generic, must be resolved anew, so we
5597 -- reset the entity in the generic copy. A global reference has a
5598 -- smaller depth than the parent, or else the same depth in case
5599 -- both are distinct compilation units.
5601 -- It is also possible for Current_Instantiated_Parent to be
5602 -- defined, and for this not to be a nested generic, namely if the
5603 -- unit is loaded through Rtsfind. In that case, the entity of
5604 -- New_N is only a link to the associated node, and not a defining
5607 -- The entities for parent units in the defining_program_unit of a
5608 -- generic child unit are established when the context of the unit
5609 -- is first analyzed, before the generic copy is made. They are
5610 -- preserved in the copy for use in ASIS queries.
5612 Ent := Entity (New_N);
5614 if No (Current_Instantiated_Parent.Gen_Id) then
5616 or else Nkind (Ent) /= N_Defining_Identifier
5617 or else not In_Defining_Unit_Name (N)
5619 Set_Associated_Node (New_N, Empty);
5624 not (Nkind (Ent) = N_Defining_Identifier
5626 Nkind (Ent) = N_Defining_Character_Literal
5628 Nkind (Ent) = N_Defining_Operator_Symbol)
5629 or else No (Scope (Ent))
5630 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
5631 or else (Scope_Depth (Scope (Ent)) >
5632 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
5634 Get_Source_Unit (Ent) =
5635 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
5637 Set_Associated_Node (New_N, Empty);
5640 -- Case of instantiating identifier or some other name or operator
5643 -- If the associated node is still defined, the entity in it is
5644 -- global, and must be copied to the instance. If this copy is
5645 -- being made for a body to inline, it is applied to an
5646 -- instantiated tree, and the entity is already present and must
5647 -- be also preserved.
5650 Assoc : constant Node_Id := Get_Associated_Node (N);
5652 if Present (Assoc) then
5653 if Nkind (Assoc) = Nkind (N) then
5654 Set_Entity (New_N, Entity (Assoc));
5655 Check_Private_View (N);
5657 elsif Nkind (Assoc) = N_Function_Call then
5658 Set_Entity (New_N, Entity (Name (Assoc)));
5660 elsif (Nkind (Assoc) = N_Defining_Identifier
5661 or else Nkind (Assoc) = N_Defining_Character_Literal
5662 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
5663 and then Expander_Active
5665 -- Inlining case: we are copying a tree that contains
5666 -- global entities, which are preserved in the copy to be
5667 -- used for subsequent inlining.
5672 Set_Entity (New_N, Empty);
5678 -- For expanded name, we must copy the Prefix and Selector_Name
5680 if Nkind (N) = N_Expanded_Name then
5682 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
5684 Set_Selector_Name (New_N,
5685 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
5687 -- For operators, we must copy the right operand
5689 elsif Nkind (N) in N_Op then
5690 Set_Right_Opnd (New_N,
5691 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
5693 -- And for binary operators, the left operand as well
5695 if Nkind (N) in N_Binary_Op then
5696 Set_Left_Opnd (New_N,
5697 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
5701 -- Special casing for stubs
5703 elsif Nkind (N) in N_Body_Stub then
5705 -- In any case, we must copy the specification or defining
5706 -- identifier as appropriate.
5708 if Nkind (N) = N_Subprogram_Body_Stub then
5709 Set_Specification (New_N,
5710 Copy_Generic_Node (Specification (N), New_N, Instantiating));
5713 Set_Defining_Identifier (New_N,
5715 (Defining_Identifier (N), New_N, Instantiating));
5718 -- If we are not instantiating, then this is where we load and
5719 -- analyze subunits, i.e. at the point where the stub occurs. A
5720 -- more permissivle system might defer this analysis to the point
5721 -- of instantiation, but this seems to complicated for now.
5723 if not Instantiating then
5725 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
5727 Unum : Unit_Number_Type;
5733 (Load_Name => Subunit_Name,
5738 -- If the proper body is not found, a warning message will be
5739 -- emitted when analyzing the stub, or later at the the point
5740 -- of instantiation. Here we just leave the stub as is.
5742 if Unum = No_Unit then
5743 Subunits_Missing := True;
5744 goto Subunit_Not_Found;
5747 Subunit := Cunit (Unum);
5749 if Nkind (Unit (Subunit)) /= N_Subunit then
5750 Error_Msg_Sloc := Sloc (N);
5752 ("expected SEPARATE subunit to complete stub at#,"
5753 & " found child unit", Subunit);
5754 goto Subunit_Not_Found;
5757 -- We must create a generic copy of the subunit, in order to
5758 -- perform semantic analysis on it, and we must replace the
5759 -- stub in the original generic unit with the subunit, in order
5760 -- to preserve non-local references within.
5762 -- Only the proper body needs to be copied. Library_Unit and
5763 -- context clause are simply inherited by the generic copy.
5764 -- Note that the copy (which may be recursive if there are
5765 -- nested subunits) must be done first, before attaching it to
5766 -- the enclosing generic.
5770 (Proper_Body (Unit (Subunit)),
5771 Empty, Instantiating => False);
5773 -- Now place the original proper body in the original generic
5774 -- unit. This is a body, not a compilation unit.
5776 Rewrite (N, Proper_Body (Unit (Subunit)));
5777 Set_Is_Compilation_Unit (Defining_Entity (N), False);
5778 Set_Was_Originally_Stub (N);
5780 -- Finally replace the body of the subunit with its copy, and
5781 -- make this new subunit into the library unit of the generic
5782 -- copy, which does not have stubs any longer.
5784 Set_Proper_Body (Unit (Subunit), New_Body);
5785 Set_Library_Unit (New_N, Subunit);
5786 Inherit_Context (Unit (Subunit), N);
5789 -- If we are instantiating, this must be an error case, since
5790 -- otherwise we would have replaced the stub node by the proper body
5791 -- that corresponds. So just ignore it in the copy (i.e. we have
5792 -- copied it, and that is good enough).
5798 <<Subunit_Not_Found>> null;
5800 -- If the node is a compilation unit, it is the subunit of a stub, which
5801 -- has been loaded already (see code below). In this case, the library
5802 -- unit field of N points to the parent unit (which is a compilation
5803 -- unit) and need not (and cannot!) be copied.
5805 -- When the proper body of the stub is analyzed, thie library_unit link
5806 -- is used to establish the proper context (see sem_ch10).
5808 -- The other fields of a compilation unit are copied as usual
5810 elsif Nkind (N) = N_Compilation_Unit then
5812 -- This code can only be executed when not instantiating, because in
5813 -- the copy made for an instantiation, the compilation unit node has
5814 -- disappeared at the point that a stub is replaced by its proper
5817 pragma Assert (not Instantiating);
5819 Set_Context_Items (New_N,
5820 Copy_Generic_List (Context_Items (N), New_N));
5823 Copy_Generic_Node (Unit (N), New_N, False));
5825 Set_First_Inlined_Subprogram (New_N,
5827 (First_Inlined_Subprogram (N), New_N, False));
5829 Set_Aux_Decls_Node (New_N,
5830 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
5832 -- For an assignment node, the assignment is known to be semantically
5833 -- legal if we are instantiating the template. This avoids incorrect
5834 -- diagnostics in generated code.
5836 elsif Nkind (N) = N_Assignment_Statement then
5838 -- Copy name and expression fields in usual manner
5841 Copy_Generic_Node (Name (N), New_N, Instantiating));
5843 Set_Expression (New_N,
5844 Copy_Generic_Node (Expression (N), New_N, Instantiating));
5846 if Instantiating then
5847 Set_Assignment_OK (Name (New_N), True);
5850 elsif Nkind (N) = N_Aggregate
5851 or else Nkind (N) = N_Extension_Aggregate
5854 if not Instantiating then
5855 Set_Associated_Node (N, New_N);
5858 if Present (Get_Associated_Node (N))
5859 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
5861 -- In the generic the aggregate has some composite type. If at
5862 -- the point of instantiation the type has a private view,
5863 -- install the full view (and that of its ancestors, if any).
5866 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
5871 and then Is_Private_Type (T)
5877 and then Is_Tagged_Type (T)
5878 and then Is_Derived_Type (T)
5880 Rt := Root_Type (T);
5885 if Is_Private_Type (T) then
5896 -- Do not copy the associated node, which points to
5897 -- the generic copy of the aggregate.
5900 use Atree.Unchecked_Access;
5901 -- This code section is part of the implementation of an untyped
5902 -- tree traversal, so it needs direct access to node fields.
5905 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5906 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5907 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5908 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5911 -- Allocators do not have an identifier denoting the access type,
5912 -- so we must locate it through the expression to check whether
5913 -- the views are consistent.
5915 elsif Nkind (N) = N_Allocator
5916 and then Nkind (Expression (N)) = N_Qualified_Expression
5917 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
5918 and then Instantiating
5921 T : constant Node_Id :=
5922 Get_Associated_Node (Subtype_Mark (Expression (N)));
5928 -- Retrieve the allocator node in the generic copy
5930 Acc_T := Etype (Parent (Parent (T)));
5932 and then Is_Private_Type (Acc_T)
5934 Switch_View (Acc_T);
5941 -- For a proper body, we must catch the case of a proper body that
5942 -- replaces a stub. This represents the point at which a separate
5943 -- compilation unit, and hence template file, may be referenced, so we
5944 -- must make a new source instantiation entry for the template of the
5945 -- subunit, and ensure that all nodes in the subunit are adjusted using
5946 -- this new source instantiation entry.
5948 elsif Nkind (N) in N_Proper_Body then
5950 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
5953 if Instantiating and then Was_Originally_Stub (N) then
5954 Create_Instantiation_Source
5955 (Instantiation_Node,
5956 Defining_Entity (N),
5961 -- Now copy the fields of the proper body, using the new
5962 -- adjustment factor if one was needed as per test above.
5966 -- Restore the original adjustment factor in case changed
5968 S_Adjustment := Save_Adjustment;
5971 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
5972 -- generic unit, not to the instantiating unit.
5974 elsif Nkind (N) = N_Pragma
5975 and then Instantiating
5978 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
5981 if Prag_Id = Pragma_Ident
5982 or else Prag_Id = Pragma_Comment
5984 New_N := Make_Null_Statement (Sloc (N));
5991 elsif Nkind (N) = N_Integer_Literal
5992 or else Nkind (N) = N_Real_Literal
5993 or else Nkind (N) = N_String_Literal
5995 -- No descendant fields need traversing
5999 -- For the remaining nodes, copy recursively their descendants
6005 and then Nkind (N) = N_Subprogram_Body
6007 Set_Generic_Parent (Specification (New_N), N);
6012 end Copy_Generic_Node;
6014 ----------------------------
6015 -- Denotes_Formal_Package --
6016 ----------------------------
6018 function Denotes_Formal_Package
6020 On_Exit : Boolean := False) return Boolean
6023 Scop : constant Entity_Id := Scope (Pack);
6030 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6032 Par := Current_Instantiated_Parent.Act_Id;
6035 if Ekind (Scop) = E_Generic_Package
6036 or else Nkind (Unit_Declaration_Node (Scop)) =
6037 N_Generic_Subprogram_Declaration
6041 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6042 N_Formal_Package_Declaration
6050 -- Check whether this package is associated with a formal package of
6051 -- the enclosing instantiation. Iterate over the list of renamings.
6053 E := First_Entity (Par);
6054 while Present (E) loop
6055 if Ekind (E) /= E_Package
6056 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6060 elsif Renamed_Object (E) = Par then
6063 elsif Renamed_Object (E) = Pack then
6072 end Denotes_Formal_Package;
6078 procedure End_Generic is
6080 -- ??? More things could be factored out in this routine. Should
6081 -- probably be done at a later stage.
6083 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6084 Generic_Flags.Decrement_Last;
6086 Expander_Mode_Restore;
6089 ----------------------
6090 -- Find_Actual_Type --
6091 ----------------------
6093 function Find_Actual_Type
6095 Gen_Scope : Entity_Id) return Entity_Id
6100 if not Is_Child_Unit (Gen_Scope) then
6101 return Get_Instance_Of (Typ);
6103 elsif not Is_Generic_Type (Typ)
6104 or else Scope (Typ) = Gen_Scope
6106 return Get_Instance_Of (Typ);
6109 T := Current_Entity (Typ);
6110 while Present (T) loop
6111 if In_Open_Scopes (Scope (T)) then
6114 elsif Is_Generic_Actual_Type (T) then
6123 end Find_Actual_Type;
6125 ----------------------------
6126 -- Freeze_Subprogram_Body --
6127 ----------------------------
6129 procedure Freeze_Subprogram_Body
6130 (Inst_Node : Node_Id;
6132 Pack_Id : Entity_Id)
6135 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6136 Par : constant Entity_Id := Scope (Gen_Unit);
6141 function Earlier (N1, N2 : Node_Id) return Boolean;
6142 -- Yields True if N1 and N2 appear in the same compilation unit,
6143 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6144 -- traversal of the tree for the unit.
6146 function Enclosing_Body (N : Node_Id) return Node_Id;
6147 -- Find innermost package body that encloses the given node, and which
6148 -- is not a compilation unit. Freeze nodes for the instance, or for its
6149 -- enclosing body, may be inserted after the enclosing_body of the
6152 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6153 -- Find entity for given package body, and locate or create a freeze
6156 function True_Parent (N : Node_Id) return Node_Id;
6157 -- For a subunit, return parent of corresponding stub
6163 function Earlier (N1, N2 : Node_Id) return Boolean is
6169 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6170 -- Find distance from given node to enclosing compilation unit
6176 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6179 and then Nkind (P) /= N_Compilation_Unit
6181 P := True_Parent (P);
6186 -- Start of procesing for Earlier
6189 Find_Depth (P1, D1);
6190 Find_Depth (P2, D2);
6200 P1 := True_Parent (P1);
6205 P2 := True_Parent (P2);
6209 -- At this point P1 and P2 are at the same distance from the root.
6210 -- We examine their parents until we find a common declarative
6211 -- list, at which point we can establish their relative placement
6212 -- by comparing their ultimate slocs. If we reach the root,
6213 -- N1 and N2 do not descend from the same declarative list (e.g.
6214 -- one is nested in the declarative part and the other is in a block
6215 -- in the statement part) and the earlier one is already frozen.
6217 while not Is_List_Member (P1)
6218 or else not Is_List_Member (P2)
6219 or else List_Containing (P1) /= List_Containing (P2)
6221 P1 := True_Parent (P1);
6222 P2 := True_Parent (P2);
6224 if Nkind (Parent (P1)) = N_Subunit then
6225 P1 := Corresponding_Stub (Parent (P1));
6228 if Nkind (Parent (P2)) = N_Subunit then
6229 P2 := Corresponding_Stub (Parent (P2));
6238 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6241 --------------------
6242 -- Enclosing_Body --
6243 --------------------
6245 function Enclosing_Body (N : Node_Id) return Node_Id is
6246 P : Node_Id := Parent (N);
6250 and then Nkind (Parent (P)) /= N_Compilation_Unit
6252 if Nkind (P) = N_Package_Body then
6254 if Nkind (Parent (P)) = N_Subunit then
6255 return Corresponding_Stub (Parent (P));
6261 P := True_Parent (P);
6267 -------------------------
6268 -- Package_Freeze_Node --
6269 -------------------------
6271 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6275 if Nkind (B) = N_Package_Body then
6276 Id := Corresponding_Spec (B);
6278 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6279 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6282 Ensure_Freeze_Node (Id);
6283 return Freeze_Node (Id);
6284 end Package_Freeze_Node;
6290 function True_Parent (N : Node_Id) return Node_Id is
6292 if Nkind (Parent (N)) = N_Subunit then
6293 return Parent (Corresponding_Stub (Parent (N)));
6299 -- Start of processing of Freeze_Subprogram_Body
6302 -- If the instance and the generic body appear within the same unit, and
6303 -- the instance preceeds the generic, the freeze node for the instance
6304 -- must appear after that of the generic. If the generic is nested
6305 -- within another instance I2, then current instance must be frozen
6306 -- after I2. In both cases, the freeze nodes are those of enclosing
6307 -- packages. Otherwise, the freeze node is placed at the end of the
6308 -- current declarative part.
6310 Enc_G := Enclosing_Body (Gen_Body);
6311 Enc_I := Enclosing_Body (Inst_Node);
6312 Ensure_Freeze_Node (Pack_Id);
6313 F_Node := Freeze_Node (Pack_Id);
6315 if Is_Generic_Instance (Par)
6316 and then Present (Freeze_Node (Par))
6318 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6320 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6322 -- The parent was a premature instantiation. Insert freeze node at
6323 -- the end the current declarative part.
6325 Insert_After_Last_Decl (Inst_Node, F_Node);
6328 Insert_After (Freeze_Node (Par), F_Node);
6331 -- The body enclosing the instance should be frozen after the body that
6332 -- includes the generic, because the body of the instance may make
6333 -- references to entities therein. If the two are not in the same
6334 -- declarative part, or if the one enclosing the instance is frozen
6335 -- already, freeze the instance at the end of the current declarative
6338 elsif Is_Generic_Instance (Par)
6339 and then Present (Freeze_Node (Par))
6340 and then Present (Enc_I)
6342 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6344 (Nkind (Enc_I) = N_Package_Body
6346 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6348 -- The enclosing package may contain several instances. Rather
6349 -- than computing the earliest point at which to insert its
6350 -- freeze node, we place it at the end of the declarative part
6351 -- of the parent of the generic.
6353 Insert_After_Last_Decl
6354 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6357 Insert_After_Last_Decl (Inst_Node, F_Node);
6359 elsif Present (Enc_G)
6360 and then Present (Enc_I)
6361 and then Enc_G /= Enc_I
6362 and then Earlier (Inst_Node, Gen_Body)
6364 if Nkind (Enc_G) = N_Package_Body then
6365 E_G_Id := Corresponding_Spec (Enc_G);
6366 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6368 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6371 -- Freeze package that encloses instance, and place node after
6372 -- package that encloses generic. If enclosing package is already
6373 -- frozen we have to assume it is at the proper place. This may be
6374 -- a potential ABE that requires dynamic checking.
6376 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
6378 -- Freeze enclosing subunit before instance
6380 Ensure_Freeze_Node (E_G_Id);
6382 if not Is_List_Member (Freeze_Node (E_G_Id)) then
6383 Insert_After (Enc_G, Freeze_Node (E_G_Id));
6386 Insert_After_Last_Decl (Inst_Node, F_Node);
6389 -- If none of the above, insert freeze node at the end of the current
6390 -- declarative part.
6392 Insert_After_Last_Decl (Inst_Node, F_Node);
6394 end Freeze_Subprogram_Body;
6400 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
6402 return Generic_Renamings.Table (E).Gen_Id;
6405 ---------------------
6406 -- Get_Instance_Of --
6407 ---------------------
6409 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
6410 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
6413 if Res /= Assoc_Null then
6414 return Generic_Renamings.Table (Res).Act_Id;
6416 -- On exit, entity is not instantiated: not a generic parameter, or
6417 -- else parameter of an inner generic unit.
6421 end Get_Instance_Of;
6423 ------------------------------------
6424 -- Get_Package_Instantiation_Node --
6425 ------------------------------------
6427 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
6428 Decl : Node_Id := Unit_Declaration_Node (A);
6432 -- If the Package_Instantiation attribute has been set on the package
6433 -- entity, then use it directly when it (or its Original_Node) refers
6434 -- to an N_Package_Instantiation node. In principle it should be
6435 -- possible to have this field set in all cases, which should be
6436 -- investigated, and would allow this function to be significantly
6439 if Present (Package_Instantiation (A)) then
6440 if Nkind (Package_Instantiation (A)) = N_Package_Instantiation then
6441 return Package_Instantiation (A);
6443 elsif Nkind (Original_Node (Package_Instantiation (A)))
6444 = N_Package_Instantiation
6446 return Original_Node (Package_Instantiation (A));
6450 -- If the instantiation is a compilation unit that does not need body
6451 -- then the instantiation node has been rewritten as a package
6452 -- declaration for the instance, and we return the original node.
6454 -- If it is a compilation unit and the instance node has not been
6455 -- rewritten, then it is still the unit of the compilation. Finally, if
6456 -- a body is present, this is a parent of the main unit whose body has
6457 -- been compiled for inlining purposes, and the instantiation node has
6458 -- been rewritten with the instance body.
6460 -- Otherwise the instantiation node appears after the declaration. If
6461 -- the entity is a formal package, the declaration may have been
6462 -- rewritten as a generic declaration (in the case of a formal with box)
6463 -- or left as a formal package declaration if it has actuals, and is
6464 -- found with a forward search.
6466 if Nkind (Parent (Decl)) = N_Compilation_Unit then
6467 if Nkind (Decl) = N_Package_Declaration
6468 and then Present (Corresponding_Body (Decl))
6470 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
6473 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
6474 return Original_Node (Decl);
6476 return Unit (Parent (Decl));
6479 elsif Nkind (Decl) = N_Package_Declaration
6480 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
6482 return Original_Node (Decl);
6485 Inst := Next (Decl);
6486 while Nkind (Inst) /= N_Package_Instantiation
6487 and then Nkind (Inst) /= N_Formal_Package_Declaration
6494 end Get_Package_Instantiation_Node;
6496 ------------------------
6497 -- Has_Been_Exchanged --
6498 ------------------------
6500 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
6504 Next := First_Elmt (Exchanged_Views);
6505 while Present (Next) loop
6506 if Full_View (Node (Next)) = E then
6514 end Has_Been_Exchanged;
6520 function Hash (F : Entity_Id) return HTable_Range is
6522 return HTable_Range (F mod HTable_Size);
6525 ------------------------
6526 -- Hide_Current_Scope --
6527 ------------------------
6529 procedure Hide_Current_Scope is
6530 C : constant Entity_Id := Current_Scope;
6534 Set_Is_Hidden_Open_Scope (C);
6536 E := First_Entity (C);
6537 while Present (E) loop
6538 if Is_Immediately_Visible (E) then
6539 Set_Is_Immediately_Visible (E, False);
6540 Append_Elmt (E, Hidden_Entities);
6546 -- Make the scope name invisible as well. This is necessary, but might
6547 -- conflict with calls to Rtsfind later on, in case the scope is a
6548 -- predefined one. There is no clean solution to this problem, so for
6549 -- now we depend on the user not redefining Standard itself in one of
6550 -- the parent units.
6552 if Is_Immediately_Visible (C)
6553 and then C /= Standard_Standard
6555 Set_Is_Immediately_Visible (C, False);
6556 Append_Elmt (C, Hidden_Entities);
6559 end Hide_Current_Scope;
6565 procedure Init_Env is
6566 Saved : Instance_Env;
6569 Saved.Instantiated_Parent := Current_Instantiated_Parent;
6570 Saved.Exchanged_Views := Exchanged_Views;
6571 Saved.Hidden_Entities := Hidden_Entities;
6572 Saved.Current_Sem_Unit := Current_Sem_Unit;
6573 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
6574 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
6576 -- Save configuration switches. These may be reset if the unit is a
6577 -- predefined unit, and the current mode is not Ada 2005.
6579 Save_Opt_Config_Switches (Saved.Switches);
6581 Instance_Envs.Increment_Last;
6582 Instance_Envs.Table (Instance_Envs.Last) := Saved;
6584 Exchanged_Views := New_Elmt_List;
6585 Hidden_Entities := New_Elmt_List;
6587 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6588 -- this is set properly in Set_Instance_Env.
6590 Current_Instantiated_Parent :=
6591 (Current_Scope, Current_Scope, Assoc_Null);
6594 ------------------------------
6595 -- In_Same_Declarative_Part --
6596 ------------------------------
6598 function In_Same_Declarative_Part
6600 Inst : Node_Id) return Boolean
6602 Decls : constant Node_Id := Parent (F_Node);
6603 Nod : Node_Id := Parent (Inst);
6606 while Present (Nod) loop
6610 elsif Nkind (Nod) = N_Subprogram_Body
6611 or else Nkind (Nod) = N_Package_Body
6612 or else Nkind (Nod) = N_Task_Body
6613 or else Nkind (Nod) = N_Protected_Body
6614 or else Nkind (Nod) = N_Block_Statement
6618 elsif Nkind (Nod) = N_Subunit then
6619 Nod := Corresponding_Stub (Nod);
6621 elsif Nkind (Nod) = N_Compilation_Unit then
6624 Nod := Parent (Nod);
6629 end In_Same_Declarative_Part;
6631 ---------------------
6632 -- In_Main_Context --
6633 ---------------------
6635 function In_Main_Context (E : Entity_Id) return Boolean is
6641 if not Is_Compilation_Unit (E)
6642 or else Ekind (E) /= E_Package
6643 or else In_Private_Part (E)
6648 Context := Context_Items (Cunit (Main_Unit));
6650 Clause := First (Context);
6651 while Present (Clause) loop
6652 if Nkind (Clause) = N_With_Clause then
6653 Nam := Name (Clause);
6655 -- If the current scope is part of the context of the main unit,
6656 -- analysis of the corresponding with_clause is not complete, and
6657 -- the entity is not set. We use the Chars field directly, which
6658 -- might produce false positives in rare cases, but guarantees
6659 -- that we produce all the instance bodies we will need.
6661 if (Nkind (Nam) = N_Identifier
6662 and then Chars (Nam) = Chars (E))
6663 or else (Nkind (Nam) = N_Selected_Component
6664 and then Chars (Selector_Name (Nam)) = Chars (E))
6674 end In_Main_Context;
6676 ---------------------
6677 -- Inherit_Context --
6678 ---------------------
6680 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
6681 Current_Context : List_Id;
6682 Current_Unit : Node_Id;
6687 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
6689 -- The inherited context is attached to the enclosing compilation
6690 -- unit. This is either the main unit, or the declaration for the
6691 -- main unit (in case the instantation appears within the package
6692 -- declaration and the main unit is its body).
6694 Current_Unit := Parent (Inst);
6695 while Present (Current_Unit)
6696 and then Nkind (Current_Unit) /= N_Compilation_Unit
6698 Current_Unit := Parent (Current_Unit);
6701 Current_Context := Context_Items (Current_Unit);
6703 Item := First (Context_Items (Parent (Gen_Decl)));
6704 while Present (Item) loop
6705 if Nkind (Item) = N_With_Clause then
6706 New_I := New_Copy (Item);
6707 Set_Implicit_With (New_I, True);
6708 Append (New_I, Current_Context);
6714 end Inherit_Context;
6720 procedure Initialize is
6722 Generic_Renamings.Init;
6725 Generic_Renamings_HTable.Reset;
6726 Circularity_Detected := False;
6727 Exchanged_Views := No_Elist;
6728 Hidden_Entities := No_Elist;
6731 ----------------------------
6732 -- Insert_After_Last_Decl --
6733 ----------------------------
6735 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
6736 L : List_Id := List_Containing (N);
6737 P : constant Node_Id := Parent (L);
6740 if not Is_List_Member (F_Node) then
6741 if Nkind (P) = N_Package_Specification
6742 and then L = Visible_Declarations (P)
6743 and then Present (Private_Declarations (P))
6744 and then not Is_Empty_List (Private_Declarations (P))
6746 L := Private_Declarations (P);
6749 Insert_After (Last (L), F_Node);
6751 end Insert_After_Last_Decl;
6757 procedure Install_Body
6758 (Act_Body : Node_Id;
6763 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
6764 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
6765 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
6766 Par : constant Entity_Id := Scope (Gen_Id);
6767 Gen_Unit : constant Node_Id :=
6768 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
6769 Orig_Body : Node_Id := Gen_Body;
6771 Body_Unit : Node_Id;
6773 Must_Delay : Boolean;
6775 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
6776 -- Find subprogram (if any) that encloses instance and/or generic body
6778 function True_Sloc (N : Node_Id) return Source_Ptr;
6779 -- If the instance is nested inside a generic unit, the Sloc of the
6780 -- instance indicates the place of the original definition, not the
6781 -- point of the current enclosing instance. Pending a better usage of
6782 -- Slocs to indicate instantiation places, we determine the place of
6783 -- origin of a node by finding the maximum sloc of any ancestor node.
6784 -- Why is this not equivalent to Top_Level_Location ???
6786 --------------------
6787 -- Enclosing_Subp --
6788 --------------------
6790 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
6791 Scop : Entity_Id := Scope (Id);
6794 while Scop /= Standard_Standard
6795 and then not Is_Overloadable (Scop)
6797 Scop := Scope (Scop);
6807 function True_Sloc (N : Node_Id) return Source_Ptr is
6814 while Present (N1) and then N1 /= Act_Unit loop
6815 if Sloc (N1) > Res then
6825 -- Start of processing for Install_Body
6828 -- If the body is a subunit, the freeze point is the corresponding
6829 -- stub in the current compilation, not the subunit itself.
6831 if Nkind (Parent (Gen_Body)) = N_Subunit then
6832 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
6834 Orig_Body := Gen_Body;
6837 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
6839 -- If the instantiation and the generic definition appear in the same
6840 -- package declaration, this is an early instantiation. If they appear
6841 -- in the same declarative part, it is an early instantiation only if
6842 -- the generic body appears textually later, and the generic body is
6843 -- also in the main unit.
6845 -- If instance is nested within a subprogram, and the generic body is
6846 -- not, the instance is delayed because the enclosing body is. If
6847 -- instance and body are within the same scope, or the same sub-
6848 -- program body, indicate explicitly that the instance is delayed.
6851 (Gen_Unit = Act_Unit
6852 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
6853 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
6854 or else (Gen_Unit = Body_Unit
6855 and then True_Sloc (N) < Sloc (Orig_Body)))
6856 and then Is_In_Main_Unit (Gen_Unit)
6857 and then (Scope (Act_Id) = Scope (Gen_Id)
6859 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
6861 -- If this is an early instantiation, the freeze node is placed after
6862 -- the generic body. Otherwise, if the generic appears in an instance,
6863 -- we cannot freeze the current instance until the outer one is frozen.
6864 -- This is only relevant if the current instance is nested within some
6865 -- inner scope not itself within the outer instance. If this scope is
6866 -- a package body in the same declarative part as the outer instance,
6867 -- then that body needs to be frozen after the outer instance. Finally,
6868 -- if no delay is needed, we place the freeze node at the end of the
6869 -- current declarative part.
6871 if Expander_Active then
6872 Ensure_Freeze_Node (Act_Id);
6873 F_Node := Freeze_Node (Act_Id);
6876 Insert_After (Orig_Body, F_Node);
6878 elsif Is_Generic_Instance (Par)
6879 and then Present (Freeze_Node (Par))
6880 and then Scope (Act_Id) /= Par
6882 -- Freeze instance of inner generic after instance of enclosing
6885 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
6886 Insert_After (Freeze_Node (Par), F_Node);
6888 -- Freeze package enclosing instance of inner generic after
6889 -- instance of enclosing generic.
6891 elsif Nkind (Parent (N)) = N_Package_Body
6892 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
6896 Enclosing : constant Entity_Id :=
6897 Corresponding_Spec (Parent (N));
6900 Insert_After_Last_Decl (N, F_Node);
6901 Ensure_Freeze_Node (Enclosing);
6903 if not Is_List_Member (Freeze_Node (Enclosing)) then
6904 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
6909 Insert_After_Last_Decl (N, F_Node);
6913 Insert_After_Last_Decl (N, F_Node);
6917 Set_Is_Frozen (Act_Id);
6918 Insert_Before (N, Act_Body);
6919 Mark_Rewrite_Insertion (Act_Body);
6922 -----------------------------
6923 -- Install_Formal_Packages --
6924 -----------------------------
6926 procedure Install_Formal_Packages (Par : Entity_Id) is
6930 E := First_Entity (Par);
6931 while Present (E) loop
6932 if Ekind (E) = E_Package
6933 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
6935 -- If this is the renaming for the parent instance, done
6937 if Renamed_Object (E) = Par then
6940 -- The visibility of a formal of an enclosing generic is
6943 elsif Denotes_Formal_Package (E) then
6946 elsif Present (Associated_Formal_Package (E))
6947 and then Box_Present (Parent (Associated_Formal_Package (E)))
6949 Check_Generic_Actuals (Renamed_Object (E), True);
6950 Set_Is_Hidden (E, False);
6956 end Install_Formal_Packages;
6958 --------------------
6959 -- Install_Parent --
6960 --------------------
6962 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
6963 Ancestors : constant Elist_Id := New_Elmt_List;
6964 S : constant Entity_Id := Current_Scope;
6965 Inst_Par : Entity_Id;
6966 First_Par : Entity_Id;
6967 Inst_Node : Node_Id;
6968 Gen_Par : Entity_Id;
6969 First_Gen : Entity_Id;
6972 procedure Install_Noninstance_Specs (Par : Entity_Id);
6973 -- Install the scopes of noninstance parent units ending with Par
6975 procedure Install_Spec (Par : Entity_Id);
6976 -- The child unit is within the declarative part of the parent, so
6977 -- the declarations within the parent are immediately visible.
6979 -------------------------------
6980 -- Install_Noninstance_Specs --
6981 -------------------------------
6983 procedure Install_Noninstance_Specs (Par : Entity_Id) is
6986 and then Par /= Standard_Standard
6987 and then not In_Open_Scopes (Par)
6989 Install_Noninstance_Specs (Scope (Par));
6992 end Install_Noninstance_Specs;
6998 procedure Install_Spec (Par : Entity_Id) is
6999 Spec : constant Node_Id :=
7000 Specification (Unit_Declaration_Node (Par));
7003 -- If this parent of the child instance is a top-level unit,
7004 -- then record the unit and its visibility for later resetting
7005 -- in Remove_Parent. We exclude units that are generic instances,
7006 -- as we only want to record this information for the ultimate
7007 -- top-level noninstance parent (is that always correct???).
7009 if Scope (Par) = Standard_Standard
7010 and then not Is_Generic_Instance (Par)
7012 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7013 Instance_Parent_Unit := Par;
7016 -- Open the parent scope and make it and its declarations visible.
7017 -- If this point is not within a body, then only the visible
7018 -- declarations should be made visible, and installation of the
7019 -- private declarations is deferred until the appropriate point
7020 -- within analysis of the spec being instantiated (see the handling
7021 -- of parent visibility in Analyze_Package_Specification). This is
7022 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7023 -- private view problems that occur when compiling instantiations of
7024 -- a generic child of that package (Generic_Dispatching_Constructor).
7025 -- If the instance freezes a tagged type, inlinings of operations
7026 -- from Ada.Tags may need the full view of type Tag. If inlining took
7027 -- proper account of establishing visibility of inlined subprograms'
7028 -- parents then it should be possible to remove this
7029 -- special check. ???
7032 Set_Is_Immediately_Visible (Par);
7033 Install_Visible_Declarations (Par);
7034 Set_Use (Visible_Declarations (Spec));
7036 if In_Body or else Is_RTU (Par, Ada_Tags) then
7037 Install_Private_Declarations (Par);
7038 Set_Use (Private_Declarations (Spec));
7042 -- Start of processing for Install_Parent
7045 -- We need to install the parent instance to compile the instantiation
7046 -- of the child, but the child instance must appear in the current
7047 -- scope. Given that we cannot place the parent above the current scope
7048 -- in the scope stack, we duplicate the current scope and unstack both
7049 -- after the instantiation is complete.
7051 -- If the parent is itself the instantiation of a child unit, we must
7052 -- also stack the instantiation of its parent, and so on. Each such
7053 -- ancestor is the prefix of the name in a prior instantiation.
7055 -- If this is a nested instance, the parent unit itself resolves to
7056 -- a renaming of the parent instance, whose declaration we need.
7058 -- Finally, the parent may be a generic (not an instance) when the
7059 -- child unit appears as a formal package.
7063 if Present (Renamed_Entity (Inst_Par)) then
7064 Inst_Par := Renamed_Entity (Inst_Par);
7067 First_Par := Inst_Par;
7070 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7072 First_Gen := Gen_Par;
7074 while Present (Gen_Par)
7075 and then Is_Child_Unit (Gen_Par)
7077 -- Load grandparent instance as well
7079 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7081 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7082 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7084 if Present (Renamed_Entity (Inst_Par)) then
7085 Inst_Par := Renamed_Entity (Inst_Par);
7090 (Specification (Unit_Declaration_Node (Inst_Par)));
7092 if Present (Gen_Par) then
7093 Prepend_Elmt (Inst_Par, Ancestors);
7096 -- Parent is not the name of an instantiation
7098 Install_Noninstance_Specs (Inst_Par);
7110 if Present (First_Gen) then
7111 Append_Elmt (First_Par, Ancestors);
7114 Install_Noninstance_Specs (First_Par);
7117 if not Is_Empty_Elmt_List (Ancestors) then
7118 Elmt := First_Elmt (Ancestors);
7120 while Present (Elmt) loop
7121 Install_Spec (Node (Elmt));
7122 Install_Formal_Packages (Node (Elmt));
7133 --------------------------------
7134 -- Instantiate_Formal_Package --
7135 --------------------------------
7137 function Instantiate_Formal_Package
7140 Analyzed_Formal : Node_Id) return List_Id
7142 Loc : constant Source_Ptr := Sloc (Actual);
7143 Actual_Pack : Entity_Id;
7144 Formal_Pack : Entity_Id;
7145 Gen_Parent : Entity_Id;
7148 Parent_Spec : Node_Id;
7150 procedure Find_Matching_Actual
7152 Act : in out Entity_Id);
7153 -- We need to associate each formal entity in the formal package
7154 -- with the corresponding entity in the actual package. The actual
7155 -- package has been analyzed and possibly expanded, and as a result
7156 -- there is no one-to-one correspondence between the two lists (for
7157 -- example, the actual may include subtypes, itypes, and inherited
7158 -- primitive operations, interspersed among the renaming declarations
7159 -- for the actuals) . We retrieve the corresponding actual by name
7160 -- because each actual has the same name as the formal, and they do
7161 -- appear in the same order.
7163 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7164 -- Retrieve entity of defining entity of generic formal parameter.
7165 -- Only the declarations of formals need to be considered when
7166 -- linking them to actuals, but the declarative list may include
7167 -- internal entities generated during analysis, and those are ignored.
7169 procedure Match_Formal_Entity
7170 (Formal_Node : Node_Id;
7171 Formal_Ent : Entity_Id;
7172 Actual_Ent : Entity_Id);
7173 -- Associates the formal entity with the actual. In the case
7174 -- where Formal_Ent is a formal package, this procedure iterates
7175 -- through all of its formals and enters associations betwen the
7176 -- actuals occurring in the formal package's corresponding actual
7177 -- package (given by Actual_Ent) and the formal package's formal
7178 -- parameters. This procedure recurses if any of the parameters is
7179 -- itself a package.
7181 function Is_Instance_Of
7182 (Act_Spec : Entity_Id;
7183 Gen_Anc : Entity_Id) return Boolean;
7184 -- The actual can be an instantiation of a generic within another
7185 -- instance, in which case there is no direct link from it to the
7186 -- original generic ancestor. In that case, we recognize that the
7187 -- ultimate ancestor is the same by examining names and scopes.
7189 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
7190 -- Within the generic part, entities in the formal package are
7191 -- visible. To validate subsequent type declarations, indicate
7192 -- the correspondence betwen the entities in the analyzed formal,
7193 -- and the entities in the actual package. There are three packages
7194 -- involved in the instantiation of a formal package: the parent
7195 -- generic P1 which appears in the generic declaration, the fake
7196 -- instantiation P2 which appears in the analyzed generic, and whose
7197 -- visible entities may be used in subsequent formals, and the actual
7198 -- P3 in the instance. To validate subsequent formals, me indicate
7199 -- that the entities in P2 are mapped into those of P3. The mapping of
7200 -- entities has to be done recursively for nested packages.
7202 procedure Process_Nested_Formal (Formal : Entity_Id);
7203 -- If the current formal is declared with a box, its own formals are
7204 -- visible in the instance, as they were in the generic, and their
7205 -- Hidden flag must be reset. If some of these formals are themselves
7206 -- packages declared with a box, the processing must be recursive.
7208 --------------------------
7209 -- Find_Matching_Actual --
7210 --------------------------
7212 procedure Find_Matching_Actual
7214 Act : in out Entity_Id)
7216 Formal_Ent : Entity_Id;
7219 case Nkind (Original_Node (F)) is
7220 when N_Formal_Object_Declaration |
7221 N_Formal_Type_Declaration =>
7222 Formal_Ent := Defining_Identifier (F);
7224 while Chars (Act) /= Chars (Formal_Ent) loop
7228 when N_Formal_Subprogram_Declaration |
7229 N_Formal_Package_Declaration |
7230 N_Package_Declaration |
7231 N_Generic_Package_Declaration =>
7232 Formal_Ent := Defining_Entity (F);
7234 while Chars (Act) /= Chars (Formal_Ent) loop
7239 raise Program_Error;
7241 end Find_Matching_Actual;
7243 -------------------------
7244 -- Match_Formal_Entity --
7245 -------------------------
7247 procedure Match_Formal_Entity
7248 (Formal_Node : Node_Id;
7249 Formal_Ent : Entity_Id;
7250 Actual_Ent : Entity_Id)
7252 Act_Pkg : Entity_Id;
7255 Set_Instance_Of (Formal_Ent, Actual_Ent);
7257 if Ekind (Actual_Ent) = E_Package then
7259 -- Record associations for each parameter
7261 Act_Pkg := Actual_Ent;
7264 A_Ent : Entity_Id := First_Entity (Act_Pkg);
7273 -- Retrieve the actual given in the formal package declaration
7275 Actual := Entity (Name (Original_Node (Formal_Node)));
7277 -- The actual in the formal package declaration may be a
7278 -- renamed generic package, in which case we want to retrieve
7279 -- the original generic in order to traverse its formal part.
7281 if Present (Renamed_Entity (Actual)) then
7282 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
7284 Gen_Decl := Unit_Declaration_Node (Actual);
7287 Formals := Generic_Formal_Declarations (Gen_Decl);
7289 if Present (Formals) then
7290 F_Node := First_Non_Pragma (Formals);
7295 while Present (A_Ent)
7296 and then Present (F_Node)
7297 and then A_Ent /= First_Private_Entity (Act_Pkg)
7299 F_Ent := Get_Formal_Entity (F_Node);
7301 if Present (F_Ent) then
7303 -- This is a formal of the original package. Record
7304 -- association and recurse.
7306 Find_Matching_Actual (F_Node, A_Ent);
7307 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
7308 Next_Entity (A_Ent);
7311 Next_Non_Pragma (F_Node);
7315 end Match_Formal_Entity;
7317 -----------------------
7318 -- Get_Formal_Entity --
7319 -----------------------
7321 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
7322 Kind : constant Node_Kind := Nkind (Original_Node (N));
7325 when N_Formal_Object_Declaration =>
7326 return Defining_Identifier (N);
7328 when N_Formal_Type_Declaration =>
7329 return Defining_Identifier (N);
7331 when N_Formal_Subprogram_Declaration =>
7332 return Defining_Unit_Name (Specification (N));
7334 when N_Formal_Package_Declaration =>
7335 return Defining_Identifier (Original_Node (N));
7337 when N_Generic_Package_Declaration =>
7338 return Defining_Identifier (Original_Node (N));
7340 -- All other declarations are introduced by semantic analysis and
7341 -- have no match in the actual.
7346 end Get_Formal_Entity;
7348 --------------------
7349 -- Is_Instance_Of --
7350 --------------------
7352 function Is_Instance_Of
7353 (Act_Spec : Entity_Id;
7354 Gen_Anc : Entity_Id) return Boolean
7356 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
7359 if No (Gen_Par) then
7362 -- Simplest case: the generic parent of the actual is the formal
7364 elsif Gen_Par = Gen_Anc then
7367 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
7370 -- The actual may be obtained through several instantiations. Its
7371 -- scope must itself be an instance of a generic declared in the
7372 -- same scope as the formal. Any other case is detected above.
7374 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
7378 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
7386 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
7391 Set_Instance_Of (Form, Act);
7393 -- Traverse formal and actual package to map the corresponding
7394 -- entities. We skip over internal entities that may be generated
7395 -- during semantic analysis, and find the matching entities by
7396 -- name, given that they must appear in the same order.
7398 E1 := First_Entity (Form);
7399 E2 := First_Entity (Act);
7401 and then E1 /= First_Private_Entity (Form)
7403 -- Could this test be a single condition???
7404 -- Seems like it could, and isn't FPE (Form) a constant anyway???
7406 if not Is_Internal (E1)
7407 and then Present (Parent (E1))
7408 and then not Is_Class_Wide_Type (E1)
7409 and then not Is_Internal_Name (Chars (E1))
7412 and then Chars (E2) /= Chars (E1)
7420 Set_Instance_Of (E1, E2);
7423 and then Is_Tagged_Type (E2)
7426 (Class_Wide_Type (E1), Class_Wide_Type (E2));
7429 if Ekind (E1) = E_Package
7430 and then No (Renamed_Object (E1))
7432 Map_Entities (E1, E2);
7441 ---------------------------
7442 -- Process_Nested_Formal --
7443 ---------------------------
7445 procedure Process_Nested_Formal (Formal : Entity_Id) is
7449 if Present (Associated_Formal_Package (Formal))
7450 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
7452 Ent := First_Entity (Formal);
7453 while Present (Ent) loop
7454 Set_Is_Hidden (Ent, False);
7455 Set_Is_Visible_Formal (Ent);
7456 Set_Is_Potentially_Use_Visible
7457 (Ent, Is_Potentially_Use_Visible (Formal));
7459 if Ekind (Ent) = E_Package then
7460 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
7461 Process_Nested_Formal (Ent);
7467 end Process_Nested_Formal;
7469 -- Start of processing for Instantiate_Formal_Package
7474 if not Is_Entity_Name (Actual)
7475 or else Ekind (Entity (Actual)) /= E_Package
7478 ("expect package instance to instantiate formal", Actual);
7479 Abandon_Instantiation (Actual);
7480 raise Program_Error;
7483 Actual_Pack := Entity (Actual);
7484 Set_Is_Instantiated (Actual_Pack);
7486 -- The actual may be a renamed package, or an outer generic formal
7487 -- package whose instantiation is converted into a renaming.
7489 if Present (Renamed_Object (Actual_Pack)) then
7490 Actual_Pack := Renamed_Object (Actual_Pack);
7493 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
7494 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
7495 Formal_Pack := Defining_Identifier (Analyzed_Formal);
7498 Generic_Parent (Specification (Analyzed_Formal));
7500 Defining_Unit_Name (Specification (Analyzed_Formal));
7503 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
7504 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
7506 Parent_Spec := Parent (Actual_Pack);
7509 if Gen_Parent = Any_Id then
7511 ("previous error in declaration of formal package", Actual);
7512 Abandon_Instantiation (Actual);
7515 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
7521 ("actual parameter must be instance of&", Actual, Gen_Parent);
7522 Abandon_Instantiation (Actual);
7525 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
7526 Map_Entities (Formal_Pack, Actual_Pack);
7529 Make_Package_Renaming_Declaration (Loc,
7530 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
7531 Name => New_Reference_To (Actual_Pack, Loc));
7533 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
7534 Defining_Identifier (Formal));
7535 Decls := New_List (Nod);
7537 -- If the formal F has a box, then the generic declarations are
7538 -- visible in the generic G. In an instance of G, the corresponding
7539 -- entities in the actual for F (which are the actuals for the
7540 -- instantiation of the generic that F denotes) must also be made
7541 -- visible for analysis of the current instance. On exit from the
7542 -- current instance, those entities are made private again. If the
7543 -- actual is currently in use, these entities are also use-visible.
7545 -- The loop through the actual entities also steps through the formal
7546 -- entities and enters associations from formals to actuals into the
7547 -- renaming map. This is necessary to properly handle checking of
7548 -- actual parameter associations for later formals that depend on
7549 -- actuals declared in the formal package.
7551 -- In Ada 2005, partial parametrization requires that we make visible
7552 -- the actuals corresponding to formals that were defaulted in the
7553 -- formal package. There formals are identified because they remain
7554 -- formal generics within the formal package, rather than being
7555 -- renamings of the actuals supplied.
7558 Gen_Decl : constant Node_Id :=
7559 Unit_Declaration_Node (Gen_Parent);
7560 Formals : constant List_Id :=
7561 Generic_Formal_Declarations (Gen_Decl);
7563 Actual_Ent : Entity_Id;
7564 Actual_Of_Formal : Node_Id;
7565 Formal_Node : Node_Id;
7566 Formal_Ent : Entity_Id;
7569 if Present (Formals) then
7570 Formal_Node := First_Non_Pragma (Formals);
7572 Formal_Node := Empty;
7575 Actual_Ent := First_Entity (Actual_Pack);
7577 First (Visible_Declarations (Specification (Analyzed_Formal)));
7578 while Present (Actual_Ent)
7579 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7581 if Present (Formal_Node) then
7582 Formal_Ent := Get_Formal_Entity (Formal_Node);
7584 if Present (Formal_Ent) then
7585 Find_Matching_Actual (Formal_Node, Actual_Ent);
7587 (Formal_Node, Formal_Ent, Actual_Ent);
7589 -- We iterate at the same time over the actuals of the
7590 -- local package created for the formal, to determine
7591 -- which one of the formals of the original generic were
7592 -- defaulted in the formal. The corresponding actual
7593 -- entities are visible in the enclosing instance.
7595 if Box_Present (Formal)
7597 (Present (Actual_Of_Formal)
7600 (Get_Formal_Entity (Actual_Of_Formal)))
7602 Set_Is_Hidden (Actual_Ent, False);
7603 Set_Is_Visible_Formal (Actual_Ent);
7604 Set_Is_Potentially_Use_Visible
7605 (Actual_Ent, In_Use (Actual_Pack));
7607 if Ekind (Actual_Ent) = E_Package then
7608 Process_Nested_Formal (Actual_Ent);
7612 Set_Is_Hidden (Actual_Ent);
7613 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
7617 Next_Non_Pragma (Formal_Node);
7618 Next (Actual_Of_Formal);
7621 -- No further formals to match, but the generic part may
7622 -- contain inherited operation that are not hidden in the
7623 -- enclosing instance.
7625 Next_Entity (Actual_Ent);
7629 -- Inherited subprograms generated by formal derived types are
7630 -- also visible if the types are.
7632 Actual_Ent := First_Entity (Actual_Pack);
7633 while Present (Actual_Ent)
7634 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7636 if Is_Overloadable (Actual_Ent)
7638 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
7640 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
7642 Set_Is_Hidden (Actual_Ent, False);
7643 Set_Is_Potentially_Use_Visible
7644 (Actual_Ent, In_Use (Actual_Pack));
7647 Next_Entity (Actual_Ent);
7651 -- If the formal is not declared with a box, reanalyze it as an
7652 -- abbreviated instantiation, to verify the matching rules of 12.7.
7653 -- The actual checks are performed after the generic associations
7654 -- have been analyzed, to guarantee the same visibility for this
7655 -- instantiation and for the actuals.
7657 -- In Ada 2005, the generic associations for the formal can include
7658 -- defaulted parameters. These are ignored during check. This
7659 -- internal instantiation is removed from the tree after conformance
7660 -- checking, because it contains formal declarations for those
7661 -- defaulted parameters, and those should not reach the back-end.
7663 if not Box_Present (Formal) then
7665 I_Pack : constant Entity_Id :=
7666 Make_Defining_Identifier (Sloc (Actual),
7667 Chars => New_Internal_Name ('P'));
7670 Set_Is_Internal (I_Pack);
7673 Make_Package_Instantiation (Sloc (Actual),
7674 Defining_Unit_Name => I_Pack,
7677 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
7678 Generic_Associations =>
7679 Generic_Associations (Formal)));
7685 end Instantiate_Formal_Package;
7687 -----------------------------------
7688 -- Instantiate_Formal_Subprogram --
7689 -----------------------------------
7691 function Instantiate_Formal_Subprogram
7694 Analyzed_Formal : Node_Id) return Node_Id
7697 Formal_Sub : constant Entity_Id :=
7698 Defining_Unit_Name (Specification (Formal));
7699 Analyzed_S : constant Entity_Id :=
7700 Defining_Unit_Name (Specification (Analyzed_Formal));
7701 Decl_Node : Node_Id;
7705 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
7706 -- If the generic is a child unit, the parent has been installed on the
7707 -- scope stack, but a default subprogram cannot resolve to something on
7708 -- the parent because that parent is not really part of the visible
7709 -- context (it is there to resolve explicit local entities). If the
7710 -- default has resolved in this way, we remove the entity from
7711 -- immediate visibility and analyze the node again to emit an error
7712 -- message or find another visible candidate.
7714 procedure Valid_Actual_Subprogram (Act : Node_Id);
7715 -- Perform legality check and raise exception on failure
7717 -----------------------
7718 -- From_Parent_Scope --
7719 -----------------------
7721 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
7722 Gen_Scope : Node_Id;
7725 Gen_Scope := Scope (Analyzed_S);
7726 while Present (Gen_Scope)
7727 and then Is_Child_Unit (Gen_Scope)
7729 if Scope (Subp) = Scope (Gen_Scope) then
7733 Gen_Scope := Scope (Gen_Scope);
7737 end From_Parent_Scope;
7739 -----------------------------
7740 -- Valid_Actual_Subprogram --
7741 -----------------------------
7743 procedure Valid_Actual_Subprogram (Act : Node_Id) is
7747 if Is_Entity_Name (Act) then
7748 Act_E := Entity (Act);
7750 elsif Nkind (Act) = N_Selected_Component
7751 and then Is_Entity_Name (Selector_Name (Act))
7753 Act_E := Entity (Selector_Name (Act));
7759 if (Present (Act_E) and then Is_Overloadable (Act_E))
7760 or else Nkind (Act) = N_Attribute_Reference
7761 or else Nkind (Act) = N_Indexed_Component
7762 or else Nkind (Act) = N_Character_Literal
7763 or else Nkind (Act) = N_Explicit_Dereference
7769 ("expect subprogram or entry name in instantiation of&",
7770 Instantiation_Node, Formal_Sub);
7771 Abandon_Instantiation (Instantiation_Node);
7773 end Valid_Actual_Subprogram;
7775 -- Start of processing for Instantiate_Formal_Subprogram
7778 New_Spec := New_Copy_Tree (Specification (Formal));
7780 -- The tree copy has created the proper instantiation sloc for the
7781 -- new specification. Use this location for all other constructed
7784 Loc := Sloc (Defining_Unit_Name (New_Spec));
7786 -- Create new entity for the actual (New_Copy_Tree does not)
7788 Set_Defining_Unit_Name
7789 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7791 -- Create new entities for the each of the formals in the
7792 -- specification of the renaming declaration built for the actual.
7794 if Present (Parameter_Specifications (New_Spec)) then
7798 F := First (Parameter_Specifications (New_Spec));
7799 while Present (F) loop
7800 Set_Defining_Identifier (F,
7801 Make_Defining_Identifier (Loc,
7802 Chars => Chars (Defining_Identifier (F))));
7808 -- Find entity of actual. If the actual is an attribute reference, it
7809 -- cannot be resolved here (its formal is missing) but is handled
7810 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7811 -- fully resolved subsequently, when the renaming declaration for the
7812 -- formal is analyzed. If it is an explicit dereference, resolve the
7813 -- prefix but not the actual itself, to prevent interpretation as call.
7815 if Present (Actual) then
7816 Loc := Sloc (Actual);
7817 Set_Sloc (New_Spec, Loc);
7819 if Nkind (Actual) = N_Operator_Symbol then
7820 Find_Direct_Name (Actual);
7822 elsif Nkind (Actual) = N_Explicit_Dereference then
7823 Analyze (Prefix (Actual));
7825 elsif Nkind (Actual) /= N_Attribute_Reference then
7829 Valid_Actual_Subprogram (Actual);
7832 elsif Present (Default_Name (Formal)) then
7833 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
7834 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
7835 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
7836 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
7837 and then Present (Entity (Default_Name (Formal)))
7839 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
7841 Nam := New_Copy (Default_Name (Formal));
7842 Set_Sloc (Nam, Loc);
7845 elsif Box_Present (Formal) then
7847 -- Actual is resolved at the point of instantiation. Create an
7848 -- identifier or operator with the same name as the formal.
7850 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
7851 Nam := Make_Operator_Symbol (Loc,
7852 Chars => Chars (Formal_Sub),
7853 Strval => No_String);
7855 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
7858 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
7859 and then Null_Present (Specification (Formal))
7861 -- Generate null body for procedure, for use in the instance
7864 Make_Subprogram_Body (Loc,
7865 Specification => New_Spec,
7866 Declarations => New_List,
7867 Handled_Statement_Sequence =>
7868 Make_Handled_Sequence_Of_Statements (Loc,
7869 Statements => New_List (Make_Null_Statement (Loc))));
7871 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
7875 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
7877 ("missing actual&", Instantiation_Node, Formal_Sub);
7879 ("\in instantiation of & declared#",
7880 Instantiation_Node, Scope (Analyzed_S));
7881 Abandon_Instantiation (Instantiation_Node);
7885 Make_Subprogram_Renaming_Declaration (Loc,
7886 Specification => New_Spec,
7889 -- If we do not have an actual and the formal specified <> then set to
7890 -- get proper default.
7892 if No (Actual) and then Box_Present (Formal) then
7893 Set_From_Default (Decl_Node);
7896 -- Gather possible interpretations for the actual before analyzing the
7897 -- instance. If overloaded, it will be resolved when analyzing the
7898 -- renaming declaration.
7900 if Box_Present (Formal)
7901 and then No (Actual)
7905 if Is_Child_Unit (Scope (Analyzed_S))
7906 and then Present (Entity (Nam))
7908 if not Is_Overloaded (Nam) then
7910 if From_Parent_Scope (Entity (Nam)) then
7911 Set_Is_Immediately_Visible (Entity (Nam), False);
7912 Set_Entity (Nam, Empty);
7913 Set_Etype (Nam, Empty);
7917 Set_Is_Immediately_Visible (Entity (Nam));
7926 Get_First_Interp (Nam, I, It);
7928 while Present (It.Nam) loop
7929 if From_Parent_Scope (It.Nam) then
7933 Get_Next_Interp (I, It);
7940 -- The generic instantiation freezes the actual. This can only be done
7941 -- once the actual is resolved, in the analysis of the renaming
7942 -- declaration. To make the formal subprogram entity available, we set
7943 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7944 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7945 -- of formal abstract subprograms.
7947 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
7949 -- We cannot analyze the renaming declaration, and thus find the actual,
7950 -- until all the actuals are assembled in the instance. For subsequent
7951 -- checks of other actuals, indicate the node that will hold the
7952 -- instance of this formal.
7954 Set_Instance_Of (Analyzed_S, Nam);
7956 if Nkind (Actual) = N_Selected_Component
7957 and then Is_Task_Type (Etype (Prefix (Actual)))
7958 and then not Is_Frozen (Etype (Prefix (Actual)))
7960 -- The renaming declaration will create a body, which must appear
7961 -- outside of the instantiation, We move the renaming declaration
7962 -- out of the instance, and create an additional renaming inside,
7963 -- to prevent freezing anomalies.
7966 Anon_Id : constant Entity_Id :=
7967 Make_Defining_Identifier
7968 (Loc, New_Internal_Name ('E'));
7970 Set_Defining_Unit_Name (New_Spec, Anon_Id);
7971 Insert_Before (Instantiation_Node, Decl_Node);
7972 Analyze (Decl_Node);
7974 -- Now create renaming within the instance
7977 Make_Subprogram_Renaming_Declaration (Loc,
7978 Specification => New_Copy_Tree (New_Spec),
7979 Name => New_Occurrence_Of (Anon_Id, Loc));
7981 Set_Defining_Unit_Name (Specification (Decl_Node),
7982 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7987 end Instantiate_Formal_Subprogram;
7989 ------------------------
7990 -- Instantiate_Object --
7991 ------------------------
7993 function Instantiate_Object
7996 Analyzed_Formal : Node_Id) return List_Id
7998 Acc_Def : Node_Id := Empty;
7999 Act_Assoc : constant Node_Id := Parent (Actual);
8000 Actual_Decl : Node_Id := Empty;
8001 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
8002 Decl_Node : Node_Id;
8005 List : constant List_Id := New_List;
8006 Loc : constant Source_Ptr := Sloc (Actual);
8007 Orig_Ftyp : constant Entity_Id :=
8008 Etype (Defining_Identifier (Analyzed_Formal));
8009 Subt_Decl : Node_Id := Empty;
8010 Subt_Mark : Node_Id := Empty;
8013 if Present (Subtype_Mark (Formal)) then
8014 Subt_Mark := Subtype_Mark (Formal);
8016 Check_Access_Definition (Formal);
8017 Acc_Def := Access_Definition (Formal);
8020 -- Sloc for error message on missing actual
8022 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
8024 if Get_Instance_Of (Formal_Id) /= Formal_Id then
8025 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8028 Set_Parent (List, Parent (Actual));
8032 if Out_Present (Formal) then
8034 -- An IN OUT generic actual must be a name. The instantiation is a
8035 -- renaming declaration. The actual is the name being renamed. We
8036 -- use the actual directly, rather than a copy, because it is not
8037 -- used further in the list of actuals, and because a copy or a use
8038 -- of relocate_node is incorrect if the instance is nested within a
8039 -- generic. In order to simplify ASIS searches, the Generic_Parent
8040 -- field links the declaration to the generic association.
8045 Instantiation_Node, Formal_Id);
8047 ("\in instantiation of & declared#",
8049 Scope (Defining_Identifier (Analyzed_Formal)));
8050 Abandon_Instantiation (Instantiation_Node);
8053 if Present (Subt_Mark) then
8055 Make_Object_Renaming_Declaration (Loc,
8056 Defining_Identifier => New_Copy (Formal_Id),
8057 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8060 else pragma Assert (Present (Acc_Def));
8062 Make_Object_Renaming_Declaration (Loc,
8063 Defining_Identifier => New_Copy (Formal_Id),
8064 Access_Definition => New_Copy_Tree (Acc_Def),
8068 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8070 -- The analysis of the actual may produce insert_action nodes, so
8071 -- the declaration must have a context in which to attach them.
8073 Append (Decl_Node, List);
8076 -- Return if the analysis of the actual reported some error
8078 if Etype (Actual) = Any_Type then
8082 -- This check is performed here because Analyze_Object_Renaming will
8083 -- not check it when Comes_From_Source is False. Note though that the
8084 -- check for the actual being the name of an object will be performed
8085 -- in Analyze_Object_Renaming.
8087 if Is_Object_Reference (Actual)
8088 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8091 ("illegal discriminant-dependent component for in out parameter",
8095 -- The actual has to be resolved in order to check that it is a
8096 -- variable (due to cases such as F(1), where F returns
8097 -- access to an array, and for overloaded prefixes).
8100 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
8102 if Is_Private_Type (Ftyp)
8103 and then not Is_Private_Type (Etype (Actual))
8104 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8105 or else Base_Type (Etype (Actual)) = Ftyp)
8107 -- If the actual has the type of the full view of the formal, or
8108 -- else a non-private subtype of the formal, then the visibility
8109 -- of the formal type has changed. Add to the actuals a subtype
8110 -- declaration that will force the exchange of views in the body
8111 -- of the instance as well.
8114 Make_Subtype_Declaration (Loc,
8115 Defining_Identifier =>
8116 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
8117 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8119 Prepend (Subt_Decl, List);
8121 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8122 Exchange_Declarations (Ftyp);
8125 Resolve (Actual, Ftyp);
8127 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
8129 ("actual for& must be a variable", Actual, Formal_Id);
8131 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8133 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8134 -- the type of the actual shall resolve to a specific anonymous
8137 if Ada_Version < Ada_05
8139 Ekind (Base_Type (Ftyp)) /=
8140 E_Anonymous_Access_Type
8142 Ekind (Base_Type (Etype (Actual))) /=
8143 E_Anonymous_Access_Type
8145 Error_Msg_NE ("type of actual does not match type of&",
8150 Note_Possible_Modification (Actual);
8152 -- Check for instantiation of atomic/volatile actual for
8153 -- non-atomic/volatile formal (RM C.6 (12)).
8155 if Is_Atomic_Object (Actual)
8156 and then not Is_Atomic (Orig_Ftyp)
8159 ("cannot instantiate non-atomic formal object " &
8160 "with atomic actual", Actual);
8162 elsif Is_Volatile_Object (Actual)
8163 and then not Is_Volatile (Orig_Ftyp)
8166 ("cannot instantiate non-volatile formal object " &
8167 "with volatile actual", Actual);
8173 -- The instantiation of a generic formal in-parameter is constant
8174 -- declaration. The actual is the expression for that declaration.
8176 if Present (Actual) then
8177 if Present (Subt_Mark) then
8179 else pragma Assert (Present (Acc_Def));
8184 Make_Object_Declaration (Loc,
8185 Defining_Identifier => New_Copy (Formal_Id),
8186 Constant_Present => True,
8187 Object_Definition => New_Copy_Tree (Def),
8188 Expression => Actual);
8190 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8192 -- A generic formal object of a tagged type is defined to be
8193 -- aliased so the new constant must also be treated as aliased.
8196 (Etype (Defining_Identifier (Analyzed_Formal)))
8198 Set_Aliased_Present (Decl_Node);
8201 Append (Decl_Node, List);
8203 -- No need to repeat (pre-)analysis of some expression nodes
8204 -- already handled in Pre_Analyze_Actuals.
8206 if Nkind (Actual) /= N_Allocator then
8209 -- Return if the analysis of the actual reported some error
8211 if Etype (Actual) = Any_Type then
8217 Typ : constant Entity_Id :=
8219 (Etype (Defining_Identifier (Analyzed_Formal)));
8222 Freeze_Before (Instantiation_Node, Typ);
8224 -- If the actual is an aggregate, perform name resolution on
8225 -- its components (the analysis of an aggregate does not do it)
8226 -- to capture local names that may be hidden if the generic is
8229 if Nkind (Actual) = N_Aggregate then
8230 Pre_Analyze_And_Resolve (Actual, Typ);
8233 if Is_Limited_Type (Typ)
8234 and then not OK_For_Limited_Init (Actual)
8237 ("initialization not allowed for limited types", Actual);
8238 Explain_Limited_Type (Typ, Actual);
8242 elsif Present (Default_Expression (Formal)) then
8244 -- Use default to construct declaration
8246 if Present (Subt_Mark) then
8248 else pragma Assert (Present (Acc_Def));
8253 Make_Object_Declaration (Sloc (Formal),
8254 Defining_Identifier => New_Copy (Formal_Id),
8255 Constant_Present => True,
8256 Object_Definition => New_Copy (Def),
8257 Expression => New_Copy_Tree (Default_Expression
8260 Append (Decl_Node, List);
8261 Set_Analyzed (Expression (Decl_Node), False);
8266 Instantiation_Node, Formal_Id);
8267 Error_Msg_NE ("\in instantiation of & declared#",
8269 Scope (Defining_Identifier (Analyzed_Formal)));
8272 (Etype (Defining_Identifier (Analyzed_Formal)))
8274 -- Create dummy constant declaration so that instance can be
8275 -- analyzed, to minimize cascaded visibility errors.
8277 if Present (Subt_Mark) then
8279 else pragma Assert (Present (Acc_Def));
8284 Make_Object_Declaration (Loc,
8285 Defining_Identifier => New_Copy (Formal_Id),
8286 Constant_Present => True,
8287 Object_Definition => New_Copy (Def),
8289 Make_Attribute_Reference (Sloc (Formal_Id),
8290 Attribute_Name => Name_First,
8291 Prefix => New_Copy (Def)));
8293 Append (Decl_Node, List);
8296 Abandon_Instantiation (Instantiation_Node);
8301 if Nkind (Actual) in N_Has_Entity then
8302 Actual_Decl := Parent (Entity (Actual));
8305 -- Ada 2005 (AI-423): For a formal object declaration with a null
8306 -- exclusion or an access definition that has a null exclusion: If the
8307 -- actual matching the formal object declaration denotes a generic
8308 -- formal object of another generic unit G, and the instantiation
8309 -- containing the actual occurs within the body of G or within the body
8310 -- of a generic unit declared within the declarative region of G, then
8311 -- the declaration of the formal object of G must have a null exclusion.
8312 -- Otherwise, the subtype of the actual matching the formal object
8313 -- declaration shall exclude null.
8315 if Ada_Version >= Ada_05
8316 and then Present (Actual_Decl)
8318 (Nkind (Actual_Decl) = N_Formal_Object_Declaration
8319 or else Nkind (Actual_Decl) = N_Object_Declaration)
8320 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
8321 and then Has_Null_Exclusion (Actual_Decl)
8322 and then not Has_Null_Exclusion (Analyzed_Formal)
8324 Error_Msg_Sloc := Sloc (Actual_Decl);
8326 ("`NOT NULL` required in formal, to match actual #",
8331 end Instantiate_Object;
8333 ------------------------------
8334 -- Instantiate_Package_Body --
8335 ------------------------------
8337 procedure Instantiate_Package_Body
8338 (Body_Info : Pending_Body_Info;
8339 Inlined_Body : Boolean := False)
8341 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8342 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8343 Loc : constant Source_Ptr := Sloc (Inst_Node);
8345 Gen_Id : constant Node_Id := Name (Inst_Node);
8346 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8347 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8348 Act_Spec : constant Node_Id := Specification (Act_Decl);
8349 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
8351 Act_Body_Name : Node_Id;
8353 Gen_Body_Id : Node_Id;
8355 Act_Body_Id : Entity_Id;
8357 Parent_Installed : Boolean := False;
8358 Save_Style_Check : constant Boolean := Style_Check;
8361 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8363 -- The instance body may already have been processed, as the parent of
8364 -- another instance that is inlined (Load_Parent_Of_Generic).
8366 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
8370 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8372 if No (Gen_Body_Id) then
8373 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
8374 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8377 -- Establish global variable for sloc adjustment and for error recovery
8379 Instantiation_Node := Inst_Node;
8381 if Present (Gen_Body_Id) then
8382 Save_Env (Gen_Unit, Act_Decl_Id);
8383 Style_Check := False;
8384 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8386 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8388 Create_Instantiation_Source
8389 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
8393 (Original_Node (Gen_Body), Empty, Instantiating => True);
8395 -- Build new name (possibly qualified) for body declaration
8397 Act_Body_Id := New_Copy (Act_Decl_Id);
8399 -- Some attributes of spec entity are not inherited by body entity
8401 Set_Handler_Records (Act_Body_Id, No_List);
8403 if Nkind (Defining_Unit_Name (Act_Spec)) =
8404 N_Defining_Program_Unit_Name
8407 Make_Defining_Program_Unit_Name (Loc,
8408 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
8409 Defining_Identifier => Act_Body_Id);
8411 Act_Body_Name := Act_Body_Id;
8414 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
8416 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
8417 Check_Generic_Actuals (Act_Decl_Id, False);
8419 -- If it is a child unit, make the parent instance (which is an
8420 -- instance of the parent of the generic) visible. The parent
8421 -- instance is the prefix of the name of the generic unit.
8423 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8424 and then Nkind (Gen_Id) = N_Expanded_Name
8426 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8427 Parent_Installed := True;
8429 elsif Is_Child_Unit (Gen_Unit) then
8430 Install_Parent (Scope (Gen_Unit), In_Body => True);
8431 Parent_Installed := True;
8434 -- If the instantiation is a library unit, and this is the main unit,
8435 -- then build the resulting compilation unit nodes for the instance.
8436 -- If this is a compilation unit but it is not the main unit, then it
8437 -- is the body of a unit in the context, that is being compiled
8438 -- because it is encloses some inlined unit or another generic unit
8439 -- being instantiated. In that case, this body is not part of the
8440 -- current compilation, and is not attached to the tree, but its
8441 -- parent must be set for analysis.
8443 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8445 -- Replace instance node with body of instance, and create new
8446 -- node for corresponding instance declaration.
8448 Build_Instance_Compilation_Unit_Nodes
8449 (Inst_Node, Act_Body, Act_Decl);
8450 Analyze (Inst_Node);
8452 if Parent (Inst_Node) = Cunit (Main_Unit) then
8454 -- If the instance is a child unit itself, then set the scope
8455 -- of the expanded body to be the parent of the instantiation
8456 -- (ensuring that the fully qualified name will be generated
8457 -- for the elaboration subprogram).
8459 if Nkind (Defining_Unit_Name (Act_Spec)) =
8460 N_Defining_Program_Unit_Name
8463 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
8467 -- Case where instantiation is not a library unit
8470 -- If this is an early instantiation, i.e. appears textually
8471 -- before the corresponding body and must be elaborated first,
8472 -- indicate that the body instance is to be delayed.
8474 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
8476 -- Now analyze the body. We turn off all checks if this is an
8477 -- internal unit, since there is no reason to have checks on for
8478 -- any predefined run-time library code. All such code is designed
8479 -- to be compiled with checks off.
8481 -- Note that we do NOT apply this criterion to children of GNAT
8482 -- (or on VMS, children of DEC). The latter units must suppress
8483 -- checks explicitly if this is needed.
8485 if Is_Predefined_File_Name
8486 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
8488 Analyze (Act_Body, Suppress => All_Checks);
8494 if not Generic_Separately_Compiled (Gen_Unit) then
8495 Inherit_Context (Gen_Body, Inst_Node);
8498 -- Remove the parent instances if they have been placed on the scope
8499 -- stack to compile the body.
8501 if Parent_Installed then
8502 Remove_Parent (In_Body => True);
8505 Restore_Private_Views (Act_Decl_Id);
8507 -- Remove the current unit from visibility if this is an instance
8508 -- that is not elaborated on the fly for inlining purposes.
8510 if not Inlined_Body then
8511 Set_Is_Immediately_Visible (Act_Decl_Id, False);
8515 Style_Check := Save_Style_Check;
8517 -- If we have no body, and the unit requires a body, then complain. This
8518 -- complaint is suppressed if we have detected other errors (since a
8519 -- common reason for missing the body is that it had errors).
8521 elsif Unit_Requires_Body (Gen_Unit) then
8522 if Serious_Errors_Detected = 0 then
8524 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
8526 -- Don't attempt to perform any cleanup actions if some other error
8527 -- was aready detected, since this can cause blowups.
8533 -- Case of package that does not need a body
8536 -- If the instantiation of the declaration is a library unit, rewrite
8537 -- the original package instantiation as a package declaration in the
8538 -- compilation unit node.
8540 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8541 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
8542 Rewrite (Inst_Node, Act_Decl);
8544 -- Generate elaboration entity, in case spec has elaboration code.
8545 -- This cannot be done when the instance is analyzed, because it
8546 -- is not known yet whether the body exists.
8548 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
8549 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
8551 -- If the instantiation is not a library unit, then append the
8552 -- declaration to the list of implicitly generated entities. unless
8553 -- it is already a list member which means that it was already
8556 elsif not Is_List_Member (Act_Decl) then
8557 Mark_Rewrite_Insertion (Act_Decl);
8558 Insert_Before (Inst_Node, Act_Decl);
8562 Expander_Mode_Restore;
8563 end Instantiate_Package_Body;
8565 ---------------------------------
8566 -- Instantiate_Subprogram_Body --
8567 ---------------------------------
8569 procedure Instantiate_Subprogram_Body
8570 (Body_Info : Pending_Body_Info)
8572 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8573 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8574 Loc : constant Source_Ptr := Sloc (Inst_Node);
8575 Gen_Id : constant Node_Id := Name (Inst_Node);
8576 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8577 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8578 Anon_Id : constant Entity_Id :=
8579 Defining_Unit_Name (Specification (Act_Decl));
8580 Pack_Id : constant Entity_Id :=
8581 Defining_Unit_Name (Parent (Act_Decl));
8584 Gen_Body_Id : Node_Id;
8586 Pack_Body : Node_Id;
8587 Prev_Formal : Entity_Id;
8589 Unit_Renaming : Node_Id;
8591 Parent_Installed : Boolean := False;
8592 Save_Style_Check : constant Boolean := Style_Check;
8595 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8597 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8599 if No (Gen_Body_Id) then
8600 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
8601 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8604 Instantiation_Node := Inst_Node;
8606 if Present (Gen_Body_Id) then
8607 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8609 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
8611 -- Either body is not present, or context is non-expanding, as
8612 -- when compiling a subunit. Mark the instance as completed, and
8613 -- diagnose a missing body when needed.
8616 and then Operating_Mode = Generate_Code
8619 ("missing proper body for instantiation", Gen_Body);
8622 Set_Has_Completion (Anon_Id);
8626 Save_Env (Gen_Unit, Anon_Id);
8627 Style_Check := False;
8628 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8629 Create_Instantiation_Source
8637 (Original_Node (Gen_Body), Empty, Instantiating => True);
8639 -- Create proper defining name for the body, to correspond to
8640 -- the one in the spec.
8642 Set_Defining_Unit_Name (Specification (Act_Body),
8643 Make_Defining_Identifier
8644 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
8645 Set_Corresponding_Spec (Act_Body, Anon_Id);
8646 Set_Has_Completion (Anon_Id);
8647 Check_Generic_Actuals (Pack_Id, False);
8649 -- Generate a reference to link the visible subprogram instance to
8650 -- the the generic body, which for navigation purposes is the only
8651 -- available source for the instance.
8654 (Related_Instance (Pack_Id),
8655 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
8657 -- If it is a child unit, make the parent instance (which is an
8658 -- instance of the parent of the generic) visible. The parent
8659 -- instance is the prefix of the name of the generic unit.
8661 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8662 and then Nkind (Gen_Id) = N_Expanded_Name
8664 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8665 Parent_Installed := True;
8667 elsif Is_Child_Unit (Gen_Unit) then
8668 Install_Parent (Scope (Gen_Unit), In_Body => True);
8669 Parent_Installed := True;
8672 -- Inside its body, a reference to the generic unit is a reference
8673 -- to the instance. The corresponding renaming is the first
8674 -- declaration in the body.
8677 Make_Subprogram_Renaming_Declaration (Loc,
8680 Specification (Original_Node (Gen_Body)),
8682 Instantiating => True),
8683 Name => New_Occurrence_Of (Anon_Id, Loc));
8685 -- If there is a formal subprogram with the same name as the unit
8686 -- itself, do not add this renaming declaration. This is a temporary
8687 -- fix for one ACVC test. ???
8689 Prev_Formal := First_Entity (Pack_Id);
8690 while Present (Prev_Formal) loop
8691 if Chars (Prev_Formal) = Chars (Gen_Unit)
8692 and then Is_Overloadable (Prev_Formal)
8697 Next_Entity (Prev_Formal);
8700 if Present (Prev_Formal) then
8701 Decls := New_List (Act_Body);
8703 Decls := New_List (Unit_Renaming, Act_Body);
8706 -- The subprogram body is placed in the body of a dummy package body,
8707 -- whose spec contains the subprogram declaration as well as the
8708 -- renaming declarations for the generic parameters.
8710 Pack_Body := Make_Package_Body (Loc,
8711 Defining_Unit_Name => New_Copy (Pack_Id),
8712 Declarations => Decls);
8714 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8716 -- If the instantiation is a library unit, then build resulting
8717 -- compilation unit nodes for the instance. The declaration of
8718 -- the enclosing package is the grandparent of the subprogram
8719 -- declaration. First replace the instantiation node as the unit
8720 -- of the corresponding compilation.
8722 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8723 if Parent (Inst_Node) = Cunit (Main_Unit) then
8724 Set_Unit (Parent (Inst_Node), Inst_Node);
8725 Build_Instance_Compilation_Unit_Nodes
8726 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
8727 Analyze (Inst_Node);
8729 Set_Parent (Pack_Body, Parent (Inst_Node));
8730 Analyze (Pack_Body);
8734 Insert_Before (Inst_Node, Pack_Body);
8735 Mark_Rewrite_Insertion (Pack_Body);
8736 Analyze (Pack_Body);
8738 if Expander_Active then
8739 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
8743 if not Generic_Separately_Compiled (Gen_Unit) then
8744 Inherit_Context (Gen_Body, Inst_Node);
8747 Restore_Private_Views (Pack_Id, False);
8749 if Parent_Installed then
8750 Remove_Parent (In_Body => True);
8754 Style_Check := Save_Style_Check;
8756 -- Body not found. Error was emitted already. If there were no previous
8757 -- errors, this may be an instance whose scope is a premature instance.
8758 -- In that case we must insure that the (legal) program does raise
8759 -- program error if executed. We generate a subprogram body for this
8760 -- purpose. See DEC ac30vso.
8762 -- Should not reference proprietary DEC tests in comments ???
8764 elsif Serious_Errors_Detected = 0
8765 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
8767 if Ekind (Anon_Id) = E_Procedure then
8769 Make_Subprogram_Body (Loc,
8771 Make_Procedure_Specification (Loc,
8772 Defining_Unit_Name =>
8773 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8774 Parameter_Specifications =>
8776 (Parameter_Specifications (Parent (Anon_Id)))),
8778 Declarations => Empty_List,
8779 Handled_Statement_Sequence =>
8780 Make_Handled_Sequence_Of_Statements (Loc,
8783 Make_Raise_Program_Error (Loc,
8785 PE_Access_Before_Elaboration))));
8789 Make_Raise_Program_Error (Loc,
8790 Reason => PE_Access_Before_Elaboration);
8792 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
8793 Set_Analyzed (Ret_Expr);
8796 Make_Subprogram_Body (Loc,
8798 Make_Function_Specification (Loc,
8799 Defining_Unit_Name =>
8800 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8801 Parameter_Specifications =>
8803 (Parameter_Specifications (Parent (Anon_Id))),
8804 Result_Definition =>
8805 New_Occurrence_Of (Etype (Anon_Id), Loc)),
8807 Declarations => Empty_List,
8808 Handled_Statement_Sequence =>
8809 Make_Handled_Sequence_Of_Statements (Loc,
8811 New_List (Make_Return_Statement (Loc, Ret_Expr))));
8814 Pack_Body := Make_Package_Body (Loc,
8815 Defining_Unit_Name => New_Copy (Pack_Id),
8816 Declarations => New_List (Act_Body));
8818 Insert_After (Inst_Node, Pack_Body);
8819 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8820 Analyze (Pack_Body);
8823 Expander_Mode_Restore;
8824 end Instantiate_Subprogram_Body;
8826 ----------------------
8827 -- Instantiate_Type --
8828 ----------------------
8830 function Instantiate_Type
8833 Analyzed_Formal : Node_Id;
8834 Actual_Decls : List_Id) return List_Id
8836 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
8837 A_Gen_T : constant Entity_Id :=
8838 Defining_Identifier (Analyzed_Formal);
8839 Ancestor : Entity_Id := Empty;
8840 Def : constant Node_Id := Formal_Type_Definition (Formal);
8842 Decl_Node : Node_Id;
8843 Decl_Nodes : List_Id;
8847 procedure Validate_Array_Type_Instance;
8848 procedure Validate_Access_Subprogram_Instance;
8849 procedure Validate_Access_Type_Instance;
8850 procedure Validate_Derived_Type_Instance;
8851 procedure Validate_Derived_Interface_Type_Instance;
8852 procedure Validate_Interface_Type_Instance;
8853 procedure Validate_Private_Type_Instance;
8854 -- These procedures perform validation tests for the named case
8856 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
8857 -- Check that base types are the same and that the subtypes match
8858 -- statically. Used in several of the above.
8860 --------------------
8861 -- Subtypes_Match --
8862 --------------------
8864 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
8865 T : constant Entity_Id := Get_Instance_Of (Gen_T);
8868 return (Base_Type (T) = Base_Type (Act_T)
8869 and then Subtypes_Statically_Match (T, Act_T))
8871 or else (Is_Class_Wide_Type (Gen_T)
8872 and then Is_Class_Wide_Type (Act_T)
8875 (Get_Instance_Of (Root_Type (Gen_T)),
8879 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
8880 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
8881 and then Ekind (Act_T) = Ekind (Gen_T)
8883 Subtypes_Statically_Match
8884 (Designated_Type (Gen_T), Designated_Type (Act_T)));
8887 -----------------------------------------
8888 -- Validate_Access_Subprogram_Instance --
8889 -----------------------------------------
8891 procedure Validate_Access_Subprogram_Instance is
8893 if not Is_Access_Type (Act_T)
8894 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
8897 ("expect access type in instantiation of &", Actual, Gen_T);
8898 Abandon_Instantiation (Actual);
8901 Check_Mode_Conformant
8902 (Designated_Type (Act_T),
8903 Designated_Type (A_Gen_T),
8907 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
8908 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
8910 ("protected access type not allowed for formal &",
8914 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
8916 ("expect protected access type for formal &",
8919 end Validate_Access_Subprogram_Instance;
8921 -----------------------------------
8922 -- Validate_Access_Type_Instance --
8923 -----------------------------------
8925 procedure Validate_Access_Type_Instance is
8926 Desig_Type : constant Entity_Id :=
8928 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
8931 if not Is_Access_Type (Act_T) then
8933 ("expect access type in instantiation of &", Actual, Gen_T);
8934 Abandon_Instantiation (Actual);
8937 if Is_Access_Constant (A_Gen_T) then
8938 if not Is_Access_Constant (Act_T) then
8940 ("actual type must be access-to-constant type", Actual);
8941 Abandon_Instantiation (Actual);
8944 if Is_Access_Constant (Act_T) then
8946 ("actual type must be access-to-variable type", Actual);
8947 Abandon_Instantiation (Actual);
8949 elsif Ekind (A_Gen_T) = E_General_Access_Type
8950 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
8952 Error_Msg_N ("actual must be general access type!", Actual);
8953 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
8954 Abandon_Instantiation (Actual);
8958 -- The designated subtypes, that is to say the subtypes introduced
8959 -- by an access type declaration (and not by a subtype declaration)
8962 if not Subtypes_Match
8963 (Desig_Type, Designated_Type (Base_Type (Act_T)))
8966 ("designated type of actual does not match that of formal &",
8968 Abandon_Instantiation (Actual);
8970 elsif Is_Access_Type (Designated_Type (Act_T))
8971 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
8973 Is_Constrained (Designated_Type (Desig_Type))
8976 ("designated type of actual does not match that of formal &",
8978 Abandon_Instantiation (Actual);
8981 -- Ada 2005: null-exclusion indicators of the two types must agree
8983 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
8985 ("non null exclusion of actual and formal & do not match",
8988 end Validate_Access_Type_Instance;
8990 ----------------------------------
8991 -- Validate_Array_Type_Instance --
8992 ----------------------------------
8994 procedure Validate_Array_Type_Instance is
8999 function Formal_Dimensions return Int;
9000 -- Count number of dimensions in array type formal
9002 -----------------------
9003 -- Formal_Dimensions --
9004 -----------------------
9006 function Formal_Dimensions return Int is
9011 if Nkind (Def) = N_Constrained_Array_Definition then
9012 Index := First (Discrete_Subtype_Definitions (Def));
9014 Index := First (Subtype_Marks (Def));
9017 while Present (Index) loop
9023 end Formal_Dimensions;
9025 -- Start of processing for Validate_Array_Type_Instance
9028 if not Is_Array_Type (Act_T) then
9030 ("expect array type in instantiation of &", Actual, Gen_T);
9031 Abandon_Instantiation (Actual);
9033 elsif Nkind (Def) = N_Constrained_Array_Definition then
9034 if not (Is_Constrained (Act_T)) then
9036 ("expect constrained array in instantiation of &",
9038 Abandon_Instantiation (Actual);
9042 if Is_Constrained (Act_T) then
9044 ("expect unconstrained array in instantiation of &",
9046 Abandon_Instantiation (Actual);
9050 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9052 ("dimensions of actual do not match formal &", Actual, Gen_T);
9053 Abandon_Instantiation (Actual);
9056 I1 := First_Index (A_Gen_T);
9057 I2 := First_Index (Act_T);
9058 for J in 1 .. Formal_Dimensions loop
9060 -- If the indices of the actual were given by a subtype_mark,
9061 -- the index was transformed into a range attribute. Retrieve
9062 -- the original type mark for checking.
9064 if Is_Entity_Name (Original_Node (I2)) then
9065 T2 := Entity (Original_Node (I2));
9070 if not Subtypes_Match
9071 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
9074 ("index types of actual do not match those of formal &",
9076 Abandon_Instantiation (Actual);
9083 if not Subtypes_Match (
9084 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
9085 Component_Type (Act_T))
9088 ("component subtype of actual does not match that of formal &",
9090 Abandon_Instantiation (Actual);
9093 if Has_Aliased_Components (A_Gen_T)
9094 and then not Has_Aliased_Components (Act_T)
9097 ("actual must have aliased components to match formal type &",
9101 end Validate_Array_Type_Instance;
9103 -----------------------------------------------
9104 -- Validate_Derived_Interface_Type_Instance --
9105 -----------------------------------------------
9107 procedure Validate_Derived_Interface_Type_Instance is
9108 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9112 -- First apply interface instance checks
9114 Validate_Interface_Type_Instance;
9116 -- Verify that immediate parent interface is an ancestor of
9120 and then not Interface_Present_In_Ancestor (Act_T, Par)
9123 ("interface actual must include progenitor&", Actual, Par);
9126 -- Now verify that the actual includes all other ancestors of
9129 Elmt := First_Elmt (Abstract_Interfaces (A_Gen_T));
9130 while Present (Elmt) loop
9131 if not Interface_Present_In_Ancestor
9132 (Act_T, Get_Instance_Of (Node (Elmt)))
9135 ("interface actual must include progenitor&",
9136 Actual, Node (Elmt));
9141 end Validate_Derived_Interface_Type_Instance;
9143 ------------------------------------
9144 -- Validate_Derived_Type_Instance --
9145 ------------------------------------
9147 procedure Validate_Derived_Type_Instance is
9148 Actual_Discr : Entity_Id;
9149 Ancestor_Discr : Entity_Id;
9152 -- If the parent type in the generic declaration is itself a previous
9153 -- formal type, then it is local to the generic and absent from the
9154 -- analyzed generic definition. In that case the ancestor is the
9155 -- instance of the formal (which must have been instantiated
9156 -- previously), unless the ancestor is itself a formal derived type.
9157 -- In this latter case (which is the subject of Corrigendum 8652/0038
9158 -- (AI-202) the ancestor of the formals is the ancestor of its
9159 -- parent. Otherwise, the analyzed generic carries the parent type.
9160 -- If the parent type is defined in a previous formal package, then
9161 -- the scope of that formal package is that of the generic type
9162 -- itself, and it has already been mapped into the corresponding type
9163 -- in the actual package.
9165 -- Common case: parent type defined outside of the generic
9167 if Is_Entity_Name (Subtype_Mark (Def))
9168 and then Present (Entity (Subtype_Mark (Def)))
9170 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9172 -- Check whether parent is defined in a previous formal package
9175 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9178 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9180 -- The type may be a local derivation, or a type extension of a
9181 -- previous formal, or of a formal of a parent package.
9183 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9185 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9187 -- Check whether the parent is another derived formal type in the
9188 -- same generic unit.
9190 if Etype (A_Gen_T) /= A_Gen_T
9191 and then Is_Generic_Type (Etype (A_Gen_T))
9192 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9193 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9195 -- Locate ancestor of parent from the subtype declaration
9196 -- created for the actual.
9202 Decl := First (Actual_Decls);
9203 while Present (Decl) loop
9204 if Nkind (Decl) = N_Subtype_Declaration
9205 and then Chars (Defining_Identifier (Decl)) =
9206 Chars (Etype (A_Gen_T))
9208 Ancestor := Generic_Parent_Type (Decl);
9216 pragma Assert (Present (Ancestor));
9220 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
9224 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
9227 -- Ada 2005 (AI-251)
9229 if Ada_Version >= Ada_05
9230 and then Is_Interface (Ancestor)
9232 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
9234 ("(Ada 2005) expected type implementing & in instantiation",
9238 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
9240 ("expect type derived from & in instantiation",
9241 Actual, First_Subtype (Ancestor));
9242 Abandon_Instantiation (Actual);
9245 -- Ada 2005 (AI-443): Synchronized formal derived type ckecks. Note
9246 -- that the formal type declaration has been rewritten as a private
9249 if Ada_Version >= Ada_05
9250 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
9251 and then Synchronized_Present (Parent (A_Gen_T))
9253 -- The actual must be a synchronized tagged type
9255 if not Is_Tagged_Type (Act_T) then
9257 ("actual of synchronized type must be tagged", Actual);
9258 Abandon_Instantiation (Actual);
9260 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
9261 and then Nkind (Type_Definition (Parent (Act_T))) =
9262 N_Derived_Type_Definition
9263 and then not Synchronized_Present (Type_Definition
9267 ("actual of synchronized type must be synchronized", Actual);
9268 Abandon_Instantiation (Actual);
9272 -- Perform atomic/volatile checks (RM C.6(12))
9274 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
9276 ("cannot have atomic actual type for non-atomic formal type",
9279 elsif Is_Volatile (Act_T)
9280 and then not Is_Volatile (Ancestor)
9281 and then Is_By_Reference_Type (Ancestor)
9284 ("cannot have volatile actual type for non-volatile formal type",
9288 -- It should not be necessary to check for unknown discriminants on
9289 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9290 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9291 -- needs fixing. ???
9293 if not Is_Indefinite_Subtype (A_Gen_T)
9294 and then not Unknown_Discriminants_Present (Formal)
9295 and then Is_Indefinite_Subtype (Act_T)
9298 ("actual subtype must be constrained", Actual);
9299 Abandon_Instantiation (Actual);
9302 if not Unknown_Discriminants_Present (Formal) then
9303 if Is_Constrained (Ancestor) then
9304 if not Is_Constrained (Act_T) then
9306 ("actual subtype must be constrained", Actual);
9307 Abandon_Instantiation (Actual);
9310 -- Ancestor is unconstrained, Check if generic formal and actual
9311 -- agree on constrainedness. The check only applies to array types
9312 -- and discriminated types.
9314 elsif Is_Constrained (Act_T) then
9315 if Ekind (Ancestor) = E_Access_Type
9317 (not Is_Constrained (A_Gen_T)
9318 and then Is_Composite_Type (A_Gen_T))
9321 ("actual subtype must be unconstrained", Actual);
9322 Abandon_Instantiation (Actual);
9325 -- A class-wide type is only allowed if the formal has unknown
9328 elsif Is_Class_Wide_Type (Act_T)
9329 and then not Has_Unknown_Discriminants (Ancestor)
9332 ("actual for & cannot be a class-wide type", Actual, Gen_T);
9333 Abandon_Instantiation (Actual);
9335 -- Otherwise, the formal and actual shall have the same number
9336 -- of discriminants and each discriminant of the actual must
9337 -- correspond to a discriminant of the formal.
9339 elsif Has_Discriminants (Act_T)
9340 and then not Has_Unknown_Discriminants (Act_T)
9341 and then Has_Discriminants (Ancestor)
9343 Actual_Discr := First_Discriminant (Act_T);
9344 Ancestor_Discr := First_Discriminant (Ancestor);
9345 while Present (Actual_Discr)
9346 and then Present (Ancestor_Discr)
9348 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
9349 No (Corresponding_Discriminant (Actual_Discr))
9352 ("discriminant & does not correspond " &
9353 "to ancestor discriminant", Actual, Actual_Discr);
9354 Abandon_Instantiation (Actual);
9357 Next_Discriminant (Actual_Discr);
9358 Next_Discriminant (Ancestor_Discr);
9361 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
9363 ("actual for & must have same number of discriminants",
9365 Abandon_Instantiation (Actual);
9368 -- This case should be caught by the earlier check for for
9369 -- constrainedness, but the check here is added for completeness.
9371 elsif Has_Discriminants (Act_T)
9372 and then not Has_Unknown_Discriminants (Act_T)
9375 ("actual for & must not have discriminants", Actual, Gen_T);
9376 Abandon_Instantiation (Actual);
9378 elsif Has_Discriminants (Ancestor) then
9380 ("actual for & must have known discriminants", Actual, Gen_T);
9381 Abandon_Instantiation (Actual);
9384 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
9386 ("constraint on actual is incompatible with formal", Actual);
9387 Abandon_Instantiation (Actual);
9390 end Validate_Derived_Type_Instance;
9392 --------------------------------------
9393 -- Validate_Interface_Type_Instance --
9394 --------------------------------------
9396 procedure Validate_Interface_Type_Instance is
9398 if not Is_Interface (Act_T) then
9400 ("actual for formal interface type must be an interface",
9403 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
9405 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
9407 Is_Protected_Interface (A_Gen_T) /=
9408 Is_Protected_Interface (Act_T)
9410 Is_Synchronized_Interface (A_Gen_T) /=
9411 Is_Synchronized_Interface (Act_T)
9414 ("actual for interface& does not match ('R'M 12.5.5(4))",
9417 end Validate_Interface_Type_Instance;
9419 ------------------------------------
9420 -- Validate_Private_Type_Instance --
9421 ------------------------------------
9423 procedure Validate_Private_Type_Instance is
9424 Formal_Discr : Entity_Id;
9425 Actual_Discr : Entity_Id;
9426 Formal_Subt : Entity_Id;
9429 if Is_Limited_Type (Act_T)
9430 and then not Is_Limited_Type (A_Gen_T)
9433 ("actual for non-limited & cannot be a limited type", Actual,
9435 Explain_Limited_Type (Act_T, Actual);
9436 Abandon_Instantiation (Actual);
9438 elsif Known_To_Have_Preelab_Init (A_Gen_T)
9439 and then not Has_Preelaborable_Initialization (Act_T)
9442 ("actual for & must have preelaborable initialization", Actual,
9445 elsif Is_Indefinite_Subtype (Act_T)
9446 and then not Is_Indefinite_Subtype (A_Gen_T)
9447 and then Ada_Version >= Ada_95
9450 ("actual for & must be a definite subtype", Actual, Gen_T);
9452 elsif not Is_Tagged_Type (Act_T)
9453 and then Is_Tagged_Type (A_Gen_T)
9456 ("actual for & must be a tagged type", Actual, Gen_T);
9458 elsif Has_Discriminants (A_Gen_T) then
9459 if not Has_Discriminants (Act_T) then
9461 ("actual for & must have discriminants", Actual, Gen_T);
9462 Abandon_Instantiation (Actual);
9464 elsif Is_Constrained (Act_T) then
9466 ("actual for & must be unconstrained", Actual, Gen_T);
9467 Abandon_Instantiation (Actual);
9470 Formal_Discr := First_Discriminant (A_Gen_T);
9471 Actual_Discr := First_Discriminant (Act_T);
9472 while Formal_Discr /= Empty loop
9473 if Actual_Discr = Empty then
9475 ("discriminants on actual do not match formal",
9477 Abandon_Instantiation (Actual);
9480 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
9482 -- Access discriminants match if designated types do
9484 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
9485 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
9486 E_Anonymous_Access_Type
9489 (Designated_Type (Base_Type (Formal_Subt))) =
9490 Designated_Type (Base_Type (Etype (Actual_Discr)))
9494 elsif Base_Type (Formal_Subt) /=
9495 Base_Type (Etype (Actual_Discr))
9498 ("types of actual discriminants must match formal",
9500 Abandon_Instantiation (Actual);
9502 elsif not Subtypes_Statically_Match
9503 (Formal_Subt, Etype (Actual_Discr))
9504 and then Ada_Version >= Ada_95
9507 ("subtypes of actual discriminants must match formal",
9509 Abandon_Instantiation (Actual);
9512 Next_Discriminant (Formal_Discr);
9513 Next_Discriminant (Actual_Discr);
9516 if Actual_Discr /= Empty then
9518 ("discriminants on actual do not match formal",
9520 Abandon_Instantiation (Actual);
9527 end Validate_Private_Type_Instance;
9529 -- Start of processing for Instantiate_Type
9532 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
9533 Error_Msg_N ("duplicate instantiation of generic type", Actual);
9534 return New_List (Error);
9536 elsif not Is_Entity_Name (Actual)
9537 or else not Is_Type (Entity (Actual))
9540 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
9541 Abandon_Instantiation (Actual);
9544 Act_T := Entity (Actual);
9546 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
9547 -- as a generic actual parameter if the corresponding formal type
9548 -- does not have a known_discriminant_part, or is a formal derived
9549 -- type that is an Unchecked_Union type.
9551 if Is_Unchecked_Union (Base_Type (Act_T)) then
9552 if not Has_Discriminants (A_Gen_T)
9554 (Is_Derived_Type (A_Gen_T)
9556 Is_Unchecked_Union (A_Gen_T))
9560 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
9561 " discriminated formal type", Act_T);
9566 -- Deal with fixed/floating restrictions
9568 if Is_Floating_Point_Type (Act_T) then
9569 Check_Restriction (No_Floating_Point, Actual);
9570 elsif Is_Fixed_Point_Type (Act_T) then
9571 Check_Restriction (No_Fixed_Point, Actual);
9574 -- Deal with error of using incomplete type as generic actual
9576 if Ekind (Act_T) = E_Incomplete_Type
9577 or else (Is_Class_Wide_Type (Act_T)
9579 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
9581 if Is_Class_Wide_Type (Act_T)
9582 or else No (Underlying_Type (Act_T))
9584 Error_Msg_N ("premature use of incomplete type", Actual);
9585 Abandon_Instantiation (Actual);
9587 Act_T := Full_View (Act_T);
9588 Set_Entity (Actual, Act_T);
9590 if Has_Private_Component (Act_T) then
9592 ("premature use of type with private component", Actual);
9596 -- Deal with error of premature use of private type as generic actual
9598 elsif Is_Private_Type (Act_T)
9599 and then Is_Private_Type (Base_Type (Act_T))
9600 and then not Is_Generic_Type (Act_T)
9601 and then not Is_Derived_Type (Act_T)
9602 and then No (Full_View (Root_Type (Act_T)))
9604 Error_Msg_N ("premature use of private type", Actual);
9606 elsif Has_Private_Component (Act_T) then
9608 ("premature use of type with private component", Actual);
9611 Set_Instance_Of (A_Gen_T, Act_T);
9613 -- If the type is generic, the class-wide type may also be used
9615 if Is_Tagged_Type (A_Gen_T)
9616 and then Is_Tagged_Type (Act_T)
9617 and then not Is_Class_Wide_Type (A_Gen_T)
9619 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
9620 Class_Wide_Type (Act_T));
9623 if not Is_Abstract_Type (A_Gen_T)
9624 and then Is_Abstract_Type (Act_T)
9627 ("actual of non-abstract formal cannot be abstract", Actual);
9630 -- A generic scalar type is a first subtype for which we generate
9631 -- an anonymous base type. Indicate that the instance of this base
9632 -- is the base type of the actual.
9634 if Is_Scalar_Type (A_Gen_T) then
9635 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
9640 when N_Formal_Private_Type_Definition =>
9641 Validate_Private_Type_Instance;
9643 when N_Formal_Derived_Type_Definition =>
9644 Validate_Derived_Type_Instance;
9646 when N_Formal_Discrete_Type_Definition =>
9647 if not Is_Discrete_Type (Act_T) then
9649 ("expect discrete type in instantiation of&", Actual, Gen_T);
9650 Abandon_Instantiation (Actual);
9653 when N_Formal_Signed_Integer_Type_Definition =>
9654 if not Is_Signed_Integer_Type (Act_T) then
9656 ("expect signed integer type in instantiation of&",
9658 Abandon_Instantiation (Actual);
9661 when N_Formal_Modular_Type_Definition =>
9662 if not Is_Modular_Integer_Type (Act_T) then
9664 ("expect modular type in instantiation of &", Actual, Gen_T);
9665 Abandon_Instantiation (Actual);
9668 when N_Formal_Floating_Point_Definition =>
9669 if not Is_Floating_Point_Type (Act_T) then
9671 ("expect float type in instantiation of &", Actual, Gen_T);
9672 Abandon_Instantiation (Actual);
9675 when N_Formal_Ordinary_Fixed_Point_Definition =>
9676 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
9678 ("expect ordinary fixed point type in instantiation of &",
9680 Abandon_Instantiation (Actual);
9683 when N_Formal_Decimal_Fixed_Point_Definition =>
9684 if not Is_Decimal_Fixed_Point_Type (Act_T) then
9686 ("expect decimal type in instantiation of &",
9688 Abandon_Instantiation (Actual);
9691 when N_Array_Type_Definition =>
9692 Validate_Array_Type_Instance;
9694 when N_Access_To_Object_Definition =>
9695 Validate_Access_Type_Instance;
9697 when N_Access_Function_Definition |
9698 N_Access_Procedure_Definition =>
9699 Validate_Access_Subprogram_Instance;
9701 when N_Record_Definition =>
9702 Validate_Interface_Type_Instance;
9704 when N_Derived_Type_Definition =>
9705 Validate_Derived_Interface_Type_Instance;
9708 raise Program_Error;
9712 Subt := New_Copy (Gen_T);
9714 -- Use adjusted sloc of subtype name as the location for other nodes in
9715 -- the subtype declaration.
9720 Make_Subtype_Declaration (Loc,
9721 Defining_Identifier => Subt,
9722 Subtype_Indication => New_Reference_To (Act_T, Loc));
9724 if Is_Private_Type (Act_T) then
9725 Set_Has_Private_View (Subtype_Indication (Decl_Node));
9727 elsif Is_Access_Type (Act_T)
9728 and then Is_Private_Type (Designated_Type (Act_T))
9730 Set_Has_Private_View (Subtype_Indication (Decl_Node));
9733 Decl_Nodes := New_List (Decl_Node);
9735 -- Flag actual derived types so their elaboration produces the
9736 -- appropriate renamings for the primitive operations of the ancestor.
9737 -- Flag actual for formal private types as well, to determine whether
9738 -- operations in the private part may override inherited operations.
9740 if Nkind (Def) = N_Formal_Derived_Type_Definition
9741 or else Nkind (Def) = N_Formal_Private_Type_Definition
9743 Set_Generic_Parent_Type (Decl_Node, Ancestor);
9746 -- If the actual is a synchronized type that implements an interface,
9747 -- the primitive operations are attached to the corresponding record,
9748 -- and we have to treat it as an additional generic actual, so that its
9749 -- primitive operations become visible in the instance. The task or
9750 -- protected type itself does not carry primitive operations.
9752 if Is_Concurrent_Type (Act_T)
9753 and then Is_Tagged_Type (Act_T)
9754 and then Present (Corresponding_Record_Type (Act_T))
9755 and then Present (Ancestor)
9756 and then Is_Interface (Ancestor)
9759 Corr_Rec : constant Entity_Id :=
9760 Corresponding_Record_Type (Act_T);
9761 New_Corr : Entity_Id;
9762 Corr_Decl : Node_Id;
9765 New_Corr := Make_Defining_Identifier (Loc,
9766 Chars => New_Internal_Name ('S'));
9768 Make_Subtype_Declaration (Loc,
9769 Defining_Identifier => New_Corr,
9770 Subtype_Indication =>
9771 New_Reference_To (Corr_Rec, Loc));
9772 Append_To (Decl_Nodes, Corr_Decl);
9774 if Ekind (Act_T) = E_Task_Type then
9775 Set_Ekind (Subt, E_Task_Subtype);
9777 Set_Ekind (Subt, E_Protected_Subtype);
9780 Set_Corresponding_Record_Type (Subt, Corr_Rec);
9781 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
9782 Set_Generic_Parent_Type (Decl_Node, Empty);
9787 end Instantiate_Type;
9789 -----------------------
9790 -- Is_Generic_Formal --
9791 -----------------------
9793 function Is_Generic_Formal (E : Entity_Id) return Boolean is
9800 Kind := Nkind (Parent (E));
9802 Kind = N_Formal_Object_Declaration
9803 or else Kind = N_Formal_Package_Declaration
9804 or else Kind = N_Formal_Type_Declaration
9806 (Is_Formal_Subprogram (E)
9808 Nkind (Parent (Parent (E))) in
9809 N_Formal_Subprogram_Declaration);
9811 end Is_Generic_Formal;
9813 ---------------------
9814 -- Is_In_Main_Unit --
9815 ---------------------
9817 function Is_In_Main_Unit (N : Node_Id) return Boolean is
9818 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
9819 Current_Unit : Node_Id;
9822 if Unum = Main_Unit then
9825 -- If the current unit is a subunit then it is either the main unit or
9826 -- is being compiled as part of the main unit.
9828 elsif Nkind (N) = N_Compilation_Unit then
9829 return Nkind (Unit (N)) = N_Subunit;
9832 Current_Unit := Parent (N);
9833 while Present (Current_Unit)
9834 and then Nkind (Current_Unit) /= N_Compilation_Unit
9836 Current_Unit := Parent (Current_Unit);
9839 -- The instantiation node is in the main unit, or else the current node
9840 -- (perhaps as the result of nested instantiations) is in the main unit,
9841 -- or in the declaration of the main unit, which in this last case must
9844 return Unum = Main_Unit
9845 or else Current_Unit = Cunit (Main_Unit)
9846 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
9847 or else (Present (Library_Unit (Current_Unit))
9848 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
9849 end Is_In_Main_Unit;
9851 ----------------------------
9852 -- Load_Parent_Of_Generic --
9853 ----------------------------
9855 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
9856 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
9857 Save_Style_Check : constant Boolean := Style_Check;
9858 True_Parent : Node_Id;
9859 Inst_Node : Node_Id;
9863 if not In_Same_Source_Unit (N, Spec)
9864 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
9865 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
9866 and then not Is_In_Main_Unit (Spec))
9868 -- Find body of parent of spec, and analyze it. A special case arises
9869 -- when the parent is an instantiation, that is to say when we are
9870 -- currently instantiating a nested generic. In that case, there is
9871 -- no separate file for the body of the enclosing instance. Instead,
9872 -- the enclosing body must be instantiated as if it were a pending
9873 -- instantiation, in order to produce the body for the nested generic
9874 -- we require now. Note that in that case the generic may be defined
9875 -- in a package body, the instance defined in the same package body,
9876 -- and the original enclosing body may not be in the main unit.
9878 True_Parent := Parent (Spec);
9881 while Present (True_Parent)
9882 and then Nkind (True_Parent) /= N_Compilation_Unit
9884 if Nkind (True_Parent) = N_Package_Declaration
9886 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
9888 -- Parent is a compilation unit that is an instantiation.
9889 -- Instantiation node has been replaced with package decl.
9891 Inst_Node := Original_Node (True_Parent);
9894 elsif Nkind (True_Parent) = N_Package_Declaration
9895 and then Present (Generic_Parent (Specification (True_Parent)))
9896 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
9898 -- Parent is an instantiation within another specification.
9899 -- Declaration for instance has been inserted before original
9900 -- instantiation node. A direct link would be preferable?
9902 Inst_Node := Next (True_Parent);
9904 while Present (Inst_Node)
9905 and then Nkind (Inst_Node) /= N_Package_Instantiation
9910 -- If the instance appears within a generic, and the generic
9911 -- unit is defined within a formal package of the enclosing
9912 -- generic, there is no generic body available, and none
9913 -- needed. A more precise test should be used ???
9915 if No (Inst_Node) then
9921 True_Parent := Parent (True_Parent);
9925 -- Case where we are currently instantiating a nested generic
9927 if Present (Inst_Node) then
9928 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
9930 -- Instantiation node and declaration of instantiated package
9931 -- were exchanged when only the declaration was needed.
9932 -- Restore instantiation node before proceeding with body.
9934 Set_Unit (Parent (True_Parent), Inst_Node);
9937 -- Now complete instantiation of enclosing body, if it appears
9938 -- in some other unit. If it appears in the current unit, the
9939 -- body will have been instantiated already.
9941 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
9943 -- We need to determine the expander mode to instantiate the
9944 -- enclosing body. Because the generic body we need may use
9945 -- global entities declared in the enclosing package (including
9946 -- aggregates) it is in general necessary to compile this body
9947 -- with expansion enabled. The exception is if we are within a
9948 -- generic package, in which case the usual generic rule
9952 Exp_Status : Boolean := True;
9956 -- Loop through scopes looking for generic package
9958 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
9959 while Present (Scop)
9960 and then Scop /= Standard_Standard
9962 if Ekind (Scop) = E_Generic_Package then
9963 Exp_Status := False;
9967 Scop := Scope (Scop);
9970 Instantiate_Package_Body
9971 (Pending_Body_Info'(
9972 Inst_Node, True_Parent, Exp_Status,
9973 Get_Code_Unit (Sloc (Inst_Node))));
9977 -- Case where we are not instantiating a nested generic
9980 Opt.Style_Check := False;
9981 Expander_Mode_Save_And_Set (True);
9982 Load_Needed_Body (Comp_Unit, OK);
9983 Opt.Style_Check := Save_Style_Check;
9984 Expander_Mode_Restore;
9987 and then Unit_Requires_Body (Defining_Entity (Spec))
9990 Bname : constant Unit_Name_Type :=
9991 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
9994 Error_Msg_Unit_1 := Bname;
9995 Error_Msg_N ("this instantiation requires$!", N);
9996 Error_Msg_File_1 := Get_File_Name (Bname, Subunit => False);
9997 Error_Msg_N ("\but file{ was not found!", N);
9998 raise Unrecoverable_Error;
10004 -- If loading parent of the generic caused an instantiation circularity,
10005 -- we abandon compilation at this point, because otherwise in some cases
10006 -- we get into trouble with infinite recursions after this point.
10008 if Circularity_Detected then
10009 raise Unrecoverable_Error;
10011 end Load_Parent_Of_Generic;
10013 -----------------------
10014 -- Move_Freeze_Nodes --
10015 -----------------------
10017 procedure Move_Freeze_Nodes
10018 (Out_Of : Entity_Id;
10023 Next_Decl : Node_Id;
10024 Next_Node : Node_Id := After;
10027 function Is_Outer_Type (T : Entity_Id) return Boolean;
10028 -- Check whether entity is declared in a scope external to that
10029 -- of the generic unit.
10031 -------------------
10032 -- Is_Outer_Type --
10033 -------------------
10035 function Is_Outer_Type (T : Entity_Id) return Boolean is
10036 Scop : Entity_Id := Scope (T);
10039 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
10043 while Scop /= Standard_Standard loop
10044 if Scop = Out_Of then
10047 Scop := Scope (Scop);
10055 -- Start of processing for Move_Freeze_Nodes
10062 -- First remove the freeze nodes that may appear before all other
10066 while Present (Decl)
10067 and then Nkind (Decl) = N_Freeze_Entity
10068 and then Is_Outer_Type (Entity (Decl))
10070 Decl := Remove_Head (L);
10071 Insert_After (Next_Node, Decl);
10072 Set_Analyzed (Decl, False);
10077 -- Next scan the list of declarations and remove each freeze node that
10078 -- appears ahead of the current node.
10080 while Present (Decl) loop
10081 while Present (Next (Decl))
10082 and then Nkind (Next (Decl)) = N_Freeze_Entity
10083 and then Is_Outer_Type (Entity (Next (Decl)))
10085 Next_Decl := Remove_Next (Decl);
10086 Insert_After (Next_Node, Next_Decl);
10087 Set_Analyzed (Next_Decl, False);
10088 Next_Node := Next_Decl;
10091 -- If the declaration is a nested package or concurrent type, then
10092 -- recurse. Nested generic packages will have been processed from the
10095 if Nkind (Decl) = N_Package_Declaration then
10096 Spec := Specification (Decl);
10098 elsif Nkind (Decl) = N_Task_Type_Declaration then
10099 Spec := Task_Definition (Decl);
10101 elsif Nkind (Decl) = N_Protected_Type_Declaration then
10102 Spec := Protected_Definition (Decl);
10108 if Present (Spec) then
10109 Move_Freeze_Nodes (Out_Of, Next_Node,
10110 Visible_Declarations (Spec));
10111 Move_Freeze_Nodes (Out_Of, Next_Node,
10112 Private_Declarations (Spec));
10117 end Move_Freeze_Nodes;
10123 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
10125 return Generic_Renamings.Table (E).Next_In_HTable;
10128 ------------------------
10129 -- Preanalyze_Actuals --
10130 ------------------------
10132 procedure Pre_Analyze_Actuals (N : Node_Id) is
10135 Errs : constant Int := Serious_Errors_Detected;
10138 Assoc := First (Generic_Associations (N));
10139 while Present (Assoc) loop
10140 if Nkind (Assoc) /= N_Others_Choice then
10141 Act := Explicit_Generic_Actual_Parameter (Assoc);
10143 -- Within a nested instantiation, a defaulted actual is an empty
10144 -- association, so nothing to analyze. If the subprogram actual
10145 -- isan attribute, analyze prefix only, because actual is not a
10146 -- complete attribute reference.
10148 -- If actual is an allocator, analyze expression only. The full
10149 -- analysis can generate code, and if instance is a compilation
10150 -- unit we have to wait until the package instance is installed
10151 -- to have a proper place to insert this code.
10153 -- String literals may be operators, but at this point we do not
10154 -- know whether the actual is a formal subprogram or a string.
10159 elsif Nkind (Act) = N_Attribute_Reference then
10160 Analyze (Prefix (Act));
10162 elsif Nkind (Act) = N_Explicit_Dereference then
10163 Analyze (Prefix (Act));
10165 elsif Nkind (Act) = N_Allocator then
10167 Expr : constant Node_Id := Expression (Act);
10170 if Nkind (Expr) = N_Subtype_Indication then
10171 Analyze (Subtype_Mark (Expr));
10173 -- Analyze separately each discriminant constraint,
10174 -- when given with a named association.
10180 Constr := First (Constraints (Constraint (Expr)));
10181 while Present (Constr) loop
10182 if Nkind (Constr) = N_Discriminant_Association then
10183 Analyze (Expression (Constr));
10197 elsif Nkind (Act) /= N_Operator_Symbol then
10201 if Errs /= Serious_Errors_Detected then
10202 Abandon_Instantiation (Act);
10208 end Pre_Analyze_Actuals;
10210 -------------------
10211 -- Remove_Parent --
10212 -------------------
10214 procedure Remove_Parent (In_Body : Boolean := False) is
10215 S : Entity_Id := Current_Scope;
10221 -- After child instantiation is complete, remove from scope stack the
10222 -- extra copy of the current scope, and then remove parent instances.
10224 if not In_Body then
10227 while Current_Scope /= S loop
10228 P := Current_Scope;
10229 End_Package_Scope (Current_Scope);
10231 if In_Open_Scopes (P) then
10232 E := First_Entity (P);
10234 while Present (E) loop
10235 Set_Is_Immediately_Visible (E, True);
10239 if Is_Generic_Instance (Current_Scope)
10240 and then P /= Current_Scope
10242 -- We are within an instance of some sibling. Retain
10243 -- visibility of parent, for proper subsequent cleanup,
10244 -- and reinstall private declarations as well.
10246 Set_In_Private_Part (P);
10247 Install_Private_Declarations (P);
10250 -- If the ultimate parent is a top-level unit recorded in
10251 -- Instance_Parent_Unit, then reset its visibility to what
10252 -- it was before instantiation. (It's not clear what the
10253 -- purpose is of testing whether Scope (P) is In_Open_Scopes,
10254 -- but that test was present before the ultimate parent test
10257 elsif not In_Open_Scopes (Scope (P))
10258 or else (P = Instance_Parent_Unit
10259 and then not Parent_Unit_Visible)
10261 Set_Is_Immediately_Visible (P, False);
10265 -- Reset visibility of entities in the enclosing scope
10267 Set_Is_Hidden_Open_Scope (Current_Scope, False);
10268 Hidden := First_Elmt (Hidden_Entities);
10270 while Present (Hidden) loop
10271 Set_Is_Immediately_Visible (Node (Hidden), True);
10272 Next_Elmt (Hidden);
10276 -- Each body is analyzed separately, and there is no context
10277 -- that needs preserving from one body instance to the next,
10278 -- so remove all parent scopes that have been installed.
10280 while Present (S) loop
10281 End_Package_Scope (S);
10282 Set_Is_Immediately_Visible (S, False);
10283 S := Current_Scope;
10284 exit when S = Standard_Standard;
10293 procedure Restore_Env is
10294 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
10297 if No (Current_Instantiated_Parent.Act_Id) then
10299 -- Restore environment after subprogram inlining
10301 Restore_Private_Views (Empty);
10304 Current_Instantiated_Parent := Saved.Instantiated_Parent;
10305 Exchanged_Views := Saved.Exchanged_Views;
10306 Hidden_Entities := Saved.Hidden_Entities;
10307 Current_Sem_Unit := Saved.Current_Sem_Unit;
10308 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
10309 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
10311 Restore_Opt_Config_Switches (Saved.Switches);
10313 Instance_Envs.Decrement_Last;
10316 ---------------------------
10317 -- Restore_Private_Views --
10318 ---------------------------
10320 procedure Restore_Private_Views
10321 (Pack_Id : Entity_Id;
10322 Is_Package : Boolean := True)
10327 Dep_Elmt : Elmt_Id;
10330 procedure Restore_Nested_Formal (Formal : Entity_Id);
10331 -- Hide the generic formals of formal packages declared with box
10332 -- which were reachable in the current instantiation.
10334 ---------------------------
10335 -- Restore_Nested_Formal --
10336 ---------------------------
10338 procedure Restore_Nested_Formal (Formal : Entity_Id) is
10342 if Present (Renamed_Object (Formal))
10343 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
10347 elsif Present (Associated_Formal_Package (Formal)) then
10349 Ent := First_Entity (Formal);
10350 while Present (Ent) loop
10351 exit when Ekind (Ent) = E_Package
10352 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
10354 Set_Is_Hidden (Ent);
10355 Set_Is_Potentially_Use_Visible (Ent, False);
10357 -- If package, then recurse
10359 if Ekind (Ent) = E_Package then
10360 Restore_Nested_Formal (Ent);
10366 end Restore_Nested_Formal;
10368 -- Start of processing for Restore_Private_Views
10371 M := First_Elmt (Exchanged_Views);
10372 while Present (M) loop
10375 -- Subtypes of types whose views have been exchanged, and that
10376 -- are defined within the instance, were not on the list of
10377 -- Private_Dependents on entry to the instance, so they have to
10378 -- be exchanged explicitly now, in order to remain consistent with
10379 -- the view of the parent type.
10381 if Ekind (Typ) = E_Private_Type
10382 or else Ekind (Typ) = E_Limited_Private_Type
10383 or else Ekind (Typ) = E_Record_Type_With_Private
10385 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
10386 while Present (Dep_Elmt) loop
10387 Dep_Typ := Node (Dep_Elmt);
10389 if Scope (Dep_Typ) = Pack_Id
10390 and then Present (Full_View (Dep_Typ))
10392 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
10393 Exchange_Declarations (Dep_Typ);
10396 Next_Elmt (Dep_Elmt);
10400 Exchange_Declarations (Node (M));
10404 if No (Pack_Id) then
10408 -- Make the generic formal parameters private, and make the formal
10409 -- types into subtypes of the actuals again.
10411 E := First_Entity (Pack_Id);
10412 while Present (E) loop
10413 Set_Is_Hidden (E, True);
10416 and then Nkind (Parent (E)) = N_Subtype_Declaration
10418 Set_Is_Generic_Actual_Type (E, False);
10420 -- An unusual case of aliasing: the actual may also be directly
10421 -- visible in the generic, and be private there, while it is fully
10422 -- visible in the context of the instance. The internal subtype is
10423 -- private in the instance, but has full visibility like its
10424 -- parent in the enclosing scope. This enforces the invariant that
10425 -- the privacy status of all private dependents of a type coincide
10426 -- with that of the parent type. This can only happen when a
10427 -- generic child unit is instantiated within sibling.
10429 if Is_Private_Type (E)
10430 and then not Is_Private_Type (Etype (E))
10432 Exchange_Declarations (E);
10435 elsif Ekind (E) = E_Package then
10437 -- The end of the renaming list is the renaming of the generic
10438 -- package itself. If the instance is a subprogram, all entities
10439 -- in the corresponding package are renamings. If this entity is
10440 -- a formal package, make its own formals private as well. The
10441 -- actual in this case is itself the renaming of an instantation.
10442 -- If the entity is not a package renaming, it is the entity
10443 -- created to validate formal package actuals: ignore.
10445 -- If the actual is itself a formal package for the enclosing
10446 -- generic, or the actual for such a formal package, it remains
10447 -- visible on exit from the instance, and therefore nothing
10448 -- needs to be done either, except to keep it accessible.
10451 and then Renamed_Object (E) = Pack_Id
10455 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
10458 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
10459 Set_Is_Hidden (E, False);
10463 Act_P : constant Entity_Id := Renamed_Object (E);
10467 Id := First_Entity (Act_P);
10469 and then Id /= First_Private_Entity (Act_P)
10471 exit when Ekind (Id) = E_Package
10472 and then Renamed_Object (Id) = Act_P;
10474 Set_Is_Hidden (Id, True);
10475 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
10477 if Ekind (Id) = E_Package then
10478 Restore_Nested_Formal (Id);
10489 end Restore_Private_Views;
10496 (Gen_Unit : Entity_Id;
10497 Act_Unit : Entity_Id)
10501 Set_Instance_Env (Gen_Unit, Act_Unit);
10504 ----------------------------
10505 -- Save_Global_References --
10506 ----------------------------
10508 procedure Save_Global_References (N : Node_Id) is
10509 Gen_Scope : Entity_Id;
10513 function Is_Global (E : Entity_Id) return Boolean;
10514 -- Check whether entity is defined outside of generic unit. Examine the
10515 -- scope of an entity, and the scope of the scope, etc, until we find
10516 -- either Standard, in which case the entity is global, or the generic
10517 -- unit itself, which indicates that the entity is local. If the entity
10518 -- is the generic unit itself, as in the case of a recursive call, or
10519 -- the enclosing generic unit, if different from the current scope, then
10520 -- it is local as well, because it will be replaced at the point of
10521 -- instantiation. On the other hand, if it is a reference to a child
10522 -- unit of a common ancestor, which appears in an instantiation, it is
10523 -- global because it is used to denote a specific compilation unit at
10524 -- the time the instantiations will be analyzed.
10526 procedure Reset_Entity (N : Node_Id);
10527 -- Save semantic information on global entity, so that it is not
10528 -- resolved again at instantiation time.
10530 procedure Save_Entity_Descendants (N : Node_Id);
10531 -- Apply Save_Global_References to the two syntactic descendants of
10532 -- non-terminal nodes that carry an Associated_Node and are processed
10533 -- through Reset_Entity. Once the global entity (if any) has been
10534 -- captured together with its type, only two syntactic descendants need
10535 -- to be traversed to complete the processing of the tree rooted at N.
10536 -- This applies to Selected_Components, Expanded_Names, and to Operator
10537 -- nodes. N can also be a character literal, identifier, or operator
10538 -- symbol node, but the call has no effect in these cases.
10540 procedure Save_Global_Defaults (N1, N2 : Node_Id);
10541 -- Default actuals in nested instances must be handled specially
10542 -- because there is no link to them from the original tree. When an
10543 -- actual subprogram is given by a default, we add an explicit generic
10544 -- association for it in the instantiation node. When we save the
10545 -- global references on the name of the instance, we recover the list
10546 -- of generic associations, and add an explicit one to the original
10547 -- generic tree, through which a global actual can be preserved.
10548 -- Similarly, if a child unit is instantiated within a sibling, in the
10549 -- context of the parent, we must preserve the identifier of the parent
10550 -- so that it can be properly resolved in a subsequent instantiation.
10552 procedure Save_Global_Descendant (D : Union_Id);
10553 -- Apply Save_Global_References recursively to the descendents of the
10556 procedure Save_References (N : Node_Id);
10557 -- This is the recursive procedure that does the work, once the
10558 -- enclosing generic scope has been established.
10564 function Is_Global (E : Entity_Id) return Boolean is
10565 Se : Entity_Id := Scope (E);
10567 function Is_Instance_Node (Decl : Node_Id) return Boolean;
10568 -- Determine whether the parent node of a reference to a child unit
10569 -- denotes an instantiation or a formal package, in which case the
10570 -- reference to the child unit is global, even if it appears within
10571 -- the current scope (e.g. when the instance appears within the body
10572 -- of an ancestor).
10574 ----------------------
10575 -- Is_Instance_Node --
10576 ----------------------
10578 function Is_Instance_Node (Decl : Node_Id) return Boolean is
10580 return (Nkind (Decl) in N_Generic_Instantiation
10582 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
10583 end Is_Instance_Node;
10585 -- Start of processing for Is_Global
10588 if E = Gen_Scope then
10591 elsif E = Standard_Standard then
10594 elsif Is_Child_Unit (E)
10595 and then (Is_Instance_Node (Parent (N2))
10596 or else (Nkind (Parent (N2)) = N_Expanded_Name
10597 and then N2 = Selector_Name (Parent (N2))
10598 and then Is_Instance_Node (Parent (Parent (N2)))))
10603 while Se /= Gen_Scope loop
10604 if Se = Standard_Standard then
10619 procedure Reset_Entity (N : Node_Id) is
10621 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
10622 -- The type of N2 is global to the generic unit. Save the
10623 -- type in the generic node.
10625 function Top_Ancestor (E : Entity_Id) return Entity_Id;
10626 -- Find the ultimate ancestor of the current unit. If it is
10627 -- not a generic unit, then the name of the current unit
10628 -- in the prefix of an expanded name must be replaced with
10629 -- its generic homonym to ensure that it will be properly
10630 -- resolved in an instance.
10632 ---------------------
10633 -- Set_Global_Type --
10634 ---------------------
10636 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
10637 Typ : constant Entity_Id := Etype (N2);
10640 Set_Etype (N, Typ);
10642 if Entity (N) /= N2
10643 and then Has_Private_View (Entity (N))
10645 -- If the entity of N is not the associated node, this is
10646 -- a nested generic and it has an associated node as well,
10647 -- whose type is already the full view (see below). Indicate
10648 -- that the original node has a private view.
10650 Set_Has_Private_View (N);
10653 -- If not a private type, nothing else to do
10655 if not Is_Private_Type (Typ) then
10656 if Is_Array_Type (Typ)
10657 and then Is_Private_Type (Component_Type (Typ))
10659 Set_Has_Private_View (N);
10662 -- If it is a derivation of a private type in a context where
10663 -- no full view is needed, nothing to do either.
10665 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
10668 -- Otherwise mark the type for flipping and use the full_view
10672 Set_Has_Private_View (N);
10674 if Present (Full_View (Typ)) then
10675 Set_Etype (N2, Full_View (Typ));
10678 end Set_Global_Type;
10684 function Top_Ancestor (E : Entity_Id) return Entity_Id is
10685 Par : Entity_Id := E;
10688 while Is_Child_Unit (Par) loop
10689 Par := Scope (Par);
10695 -- Start of processing for Reset_Entity
10698 N2 := Get_Associated_Node (N);
10701 if Present (E) then
10702 if Is_Global (E) then
10703 Set_Global_Type (N, N2);
10705 elsif Nkind (N) = N_Op_Concat
10706 and then Is_Generic_Type (Etype (N2))
10708 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
10709 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
10710 and then Is_Intrinsic_Subprogram (E)
10715 -- Entity is local. Mark generic node as unresolved.
10716 -- Note that now it does not have an entity.
10718 Set_Associated_Node (N, Empty);
10719 Set_Etype (N, Empty);
10722 if Nkind (Parent (N)) in N_Generic_Instantiation
10723 and then N = Name (Parent (N))
10725 Save_Global_Defaults (Parent (N), Parent (N2));
10728 elsif Nkind (Parent (N)) = N_Selected_Component
10729 and then Nkind (Parent (N2)) = N_Expanded_Name
10731 if Is_Global (Entity (Parent (N2))) then
10732 Change_Selected_Component_To_Expanded_Name (Parent (N));
10733 Set_Associated_Node (Parent (N), Parent (N2));
10734 Set_Global_Type (Parent (N), Parent (N2));
10735 Save_Entity_Descendants (N);
10737 -- If this is a reference to the current generic entity, replace
10738 -- by the name of the generic homonym of the current package. This
10739 -- is because in an instantiation Par.P.Q will not resolve to the
10740 -- name of the instance, whose enclosing scope is not necessarily
10741 -- Par. We use the generic homonym rather that the name of the
10742 -- generic itself, because it may be hidden by a local
10745 elsif In_Open_Scopes (Entity (Parent (N2)))
10747 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
10749 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
10750 Rewrite (Parent (N),
10751 Make_Identifier (Sloc (N),
10753 Chars (Generic_Homonym (Entity (Parent (N2))))));
10755 Rewrite (Parent (N),
10756 Make_Identifier (Sloc (N),
10757 Chars => Chars (Selector_Name (Parent (N2)))));
10761 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
10762 and then Parent (N) = Name (Parent (Parent (N)))
10764 Save_Global_Defaults
10765 (Parent (Parent (N)), Parent (Parent ((N2))));
10768 -- A selected component may denote a static constant that has been
10769 -- folded. Make the same replacement in original tree.
10771 elsif Nkind (Parent (N)) = N_Selected_Component
10772 and then (Nkind (Parent (N2)) = N_Integer_Literal
10773 or else Nkind (Parent (N2)) = N_Real_Literal)
10775 Rewrite (Parent (N),
10776 New_Copy (Parent (N2)));
10777 Set_Analyzed (Parent (N), False);
10779 -- A selected component may be transformed into a parameterless
10780 -- function call. If the called entity is global, rewrite the node
10781 -- appropriately, i.e. as an extended name for the global entity.
10783 elsif Nkind (Parent (N)) = N_Selected_Component
10784 and then Nkind (Parent (N2)) = N_Function_Call
10785 and then N = Selector_Name (Parent (N))
10787 if No (Parameter_Associations (Parent (N2))) then
10788 if Is_Global (Entity (Name (Parent (N2)))) then
10789 Change_Selected_Component_To_Expanded_Name (Parent (N));
10790 Set_Associated_Node (Parent (N), Name (Parent (N2)));
10791 Set_Global_Type (Parent (N), Name (Parent (N2)));
10792 Save_Entity_Descendants (N);
10795 Set_Associated_Node (N, Empty);
10796 Set_Etype (N, Empty);
10799 -- In Ada 2005, X.F may be a call to a primitive operation,
10800 -- rewritten as F (X). This rewriting will be done again in an
10801 -- instance, so keep the original node. Global entities will be
10802 -- captured as for other constructs.
10808 -- Entity is local. Reset in generic unit, so that node is resolved
10809 -- anew at the point of instantiation.
10812 Set_Associated_Node (N, Empty);
10813 Set_Etype (N, Empty);
10817 -----------------------------
10818 -- Save_Entity_Descendants --
10819 -----------------------------
10821 procedure Save_Entity_Descendants (N : Node_Id) is
10824 when N_Binary_Op =>
10825 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
10826 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
10829 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
10831 when N_Expanded_Name | N_Selected_Component =>
10832 Save_Global_Descendant (Union_Id (Prefix (N)));
10833 Save_Global_Descendant (Union_Id (Selector_Name (N)));
10835 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
10839 raise Program_Error;
10841 end Save_Entity_Descendants;
10843 --------------------------
10844 -- Save_Global_Defaults --
10845 --------------------------
10847 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
10848 Loc : constant Source_Ptr := Sloc (N1);
10849 Assoc2 : constant List_Id := Generic_Associations (N2);
10850 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
10857 Actual : Entity_Id;
10860 Assoc1 := Generic_Associations (N1);
10862 if Present (Assoc1) then
10863 Act1 := First (Assoc1);
10866 Set_Generic_Associations (N1, New_List);
10867 Assoc1 := Generic_Associations (N1);
10870 if Present (Assoc2) then
10871 Act2 := First (Assoc2);
10876 while Present (Act1) and then Present (Act2) loop
10881 -- Find the associations added for default suprograms
10883 if Present (Act2) then
10884 while Nkind (Act2) /= N_Generic_Association
10885 or else No (Entity (Selector_Name (Act2)))
10886 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
10891 -- Add a similar association if the default is global. The
10892 -- renaming declaration for the actual has been analyzed, and
10893 -- its alias is the program it renames. Link the actual in the
10894 -- original generic tree with the node in the analyzed tree.
10896 while Present (Act2) loop
10897 Subp := Entity (Selector_Name (Act2));
10898 Def := Explicit_Generic_Actual_Parameter (Act2);
10900 -- Following test is defence against rubbish errors
10902 if No (Alias (Subp)) then
10906 -- Retrieve the resolved actual from the renaming declaration
10907 -- created for the instantiated formal.
10909 Actual := Entity (Name (Parent (Parent (Subp))));
10910 Set_Entity (Def, Actual);
10911 Set_Etype (Def, Etype (Actual));
10913 if Is_Global (Actual) then
10915 Make_Generic_Association (Loc,
10916 Selector_Name => New_Occurrence_Of (Subp, Loc),
10917 Explicit_Generic_Actual_Parameter =>
10918 New_Occurrence_Of (Actual, Loc));
10920 Set_Associated_Node
10921 (Explicit_Generic_Actual_Parameter (Ndec), Def);
10923 Append (Ndec, Assoc1);
10925 -- If there are other defaults, add a dummy association in case
10926 -- there are other defaulted formals with the same name.
10928 elsif Present (Next (Act2)) then
10930 Make_Generic_Association (Loc,
10931 Selector_Name => New_Occurrence_Of (Subp, Loc),
10932 Explicit_Generic_Actual_Parameter => Empty);
10934 Append (Ndec, Assoc1);
10941 if Nkind (Name (N1)) = N_Identifier
10942 and then Is_Child_Unit (Gen_Id)
10943 and then Is_Global (Gen_Id)
10944 and then Is_Generic_Unit (Scope (Gen_Id))
10945 and then In_Open_Scopes (Scope (Gen_Id))
10947 -- This is an instantiation of a child unit within a sibling,
10948 -- so that the generic parent is in scope. An eventual instance
10949 -- must occur within the scope of an instance of the parent.
10950 -- Make name in instance into an expanded name, to preserve the
10951 -- identifier of the parent, so it can be resolved subsequently.
10953 Rewrite (Name (N2),
10954 Make_Expanded_Name (Loc,
10955 Chars => Chars (Gen_Id),
10956 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
10957 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
10958 Set_Entity (Name (N2), Gen_Id);
10960 Rewrite (Name (N1),
10961 Make_Expanded_Name (Loc,
10962 Chars => Chars (Gen_Id),
10963 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
10964 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
10966 Set_Associated_Node (Name (N1), Name (N2));
10967 Set_Associated_Node (Prefix (Name (N1)), Empty);
10968 Set_Associated_Node
10969 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
10970 Set_Etype (Name (N1), Etype (Gen_Id));
10973 end Save_Global_Defaults;
10975 ----------------------------
10976 -- Save_Global_Descendant --
10977 ----------------------------
10979 procedure Save_Global_Descendant (D : Union_Id) is
10983 if D in Node_Range then
10984 if D = Union_Id (Empty) then
10987 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
10988 Save_References (Node_Id (D));
10991 elsif D in List_Range then
10992 if D = Union_Id (No_List)
10993 or else Is_Empty_List (List_Id (D))
10998 N1 := First (List_Id (D));
10999 while Present (N1) loop
11000 Save_References (N1);
11005 -- Element list or other non-node field, nothing to do
11010 end Save_Global_Descendant;
11012 ---------------------
11013 -- Save_References --
11014 ---------------------
11016 -- This is the recursive procedure that does the work, once the
11017 -- enclosing generic scope has been established. We have to treat
11018 -- specially a number of node rewritings that are required by semantic
11019 -- processing and which change the kind of nodes in the generic copy:
11020 -- typically constant-folding, replacing an operator node by a string
11021 -- literal, or a selected component by an expanded name. In each of
11022 -- those cases, the transformation is propagated to the generic unit.
11024 procedure Save_References (N : Node_Id) is
11029 elsif Nkind (N) = N_Character_Literal
11030 or else Nkind (N) = N_Operator_Symbol
11032 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11035 elsif Nkind (N) = N_Operator_Symbol
11036 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
11038 Change_Operator_Symbol_To_String_Literal (N);
11041 elsif Nkind (N) in N_Op then
11042 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11043 if Nkind (N) = N_Op_Concat then
11044 Set_Is_Component_Left_Opnd (N,
11045 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11047 Set_Is_Component_Right_Opnd (N,
11048 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11054 -- Node may be transformed into call to a user-defined operator
11056 N2 := Get_Associated_Node (N);
11058 if Nkind (N2) = N_Function_Call then
11059 E := Entity (Name (N2));
11062 and then Is_Global (E)
11064 Set_Etype (N, Etype (N2));
11066 Set_Associated_Node (N, Empty);
11067 Set_Etype (N, Empty);
11070 elsif Nkind (N2) = N_Integer_Literal
11071 or else Nkind (N2) = N_Real_Literal
11072 or else Nkind (N2) = N_String_Literal
11074 if Present (Original_Node (N2))
11075 and then Nkind (Original_Node (N2)) = Nkind (N)
11078 -- Operation was constant-folded. Whenever possible,
11079 -- recover semantic information from unfolded node,
11082 Set_Associated_Node (N, Original_Node (N2));
11084 if Nkind (N) = N_Op_Concat then
11085 Set_Is_Component_Left_Opnd (N,
11086 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11087 Set_Is_Component_Right_Opnd (N,
11088 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11094 -- If original node is already modified, propagate
11095 -- constant-folding to template.
11097 Rewrite (N, New_Copy (N2));
11098 Set_Analyzed (N, False);
11101 elsif Nkind (N2) = N_Identifier
11102 and then Ekind (Entity (N2)) = E_Enumeration_Literal
11104 -- Same if call was folded into a literal, but in this case
11105 -- retain the entity to avoid spurious ambiguities if id is
11106 -- overloaded at the point of instantiation or inlining.
11108 Rewrite (N, New_Copy (N2));
11109 Set_Analyzed (N, False);
11113 -- Complete the check on operands, if node has not been
11114 -- constant-folded.
11116 if Nkind (N) in N_Op then
11117 Save_Entity_Descendants (N);
11120 elsif Nkind (N) = N_Identifier then
11121 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11123 -- If this is a discriminant reference, always save it. It is
11124 -- used in the instance to find the corresponding discriminant
11125 -- positionally rather than by name.
11127 Set_Original_Discriminant
11128 (N, Original_Discriminant (Get_Associated_Node (N)));
11132 N2 := Get_Associated_Node (N);
11134 if Nkind (N2) = N_Function_Call then
11135 E := Entity (Name (N2));
11137 -- Name resolves to a call to parameterless function. If
11138 -- original entity is global, mark node as resolved.
11141 and then Is_Global (E)
11143 Set_Etype (N, Etype (N2));
11145 Set_Associated_Node (N, Empty);
11146 Set_Etype (N, Empty);
11150 (Nkind (N2) = N_Integer_Literal
11152 Nkind (N2) = N_Real_Literal)
11153 and then Is_Entity_Name (Original_Node (N2))
11155 -- Name resolves to named number that is constant-folded,
11156 -- We must preserve the original name for ASIS use, and
11157 -- undo the constant-folding, which will be repeated in
11160 Set_Associated_Node (N, Original_Node (N2));
11163 elsif Nkind (N2) = N_String_Literal then
11165 -- Name resolves to string literal. Perform the same
11166 -- replacement in generic.
11168 Rewrite (N, New_Copy (N2));
11170 elsif Nkind (N2) = N_Explicit_Dereference then
11172 -- An identifier is rewritten as a dereference if it is
11173 -- the prefix in a selected component, and it denotes an
11174 -- access to a composite type, or a parameterless function
11175 -- call that returns an access type.
11177 -- Check whether corresponding entity in prefix is global
11179 if Is_Entity_Name (Prefix (N2))
11180 and then Present (Entity (Prefix (N2)))
11181 and then Is_Global (Entity (Prefix (N2)))
11184 Make_Explicit_Dereference (Sloc (N),
11185 Prefix => Make_Identifier (Sloc (N),
11186 Chars => Chars (N))));
11187 Set_Associated_Node (Prefix (N), Prefix (N2));
11189 elsif Nkind (Prefix (N2)) = N_Function_Call
11190 and then Is_Global (Entity (Name (Prefix (N2))))
11193 Make_Explicit_Dereference (Sloc (N),
11194 Prefix => Make_Function_Call (Sloc (N),
11196 Make_Identifier (Sloc (N),
11197 Chars => Chars (N)))));
11199 Set_Associated_Node
11200 (Name (Prefix (N)), Name (Prefix (N2)));
11203 Set_Associated_Node (N, Empty);
11204 Set_Etype (N, Empty);
11207 -- The subtype mark of a nominally unconstrained object is
11208 -- rewritten as a subtype indication using the bounds of the
11209 -- expression. Recover the original subtype mark.
11211 elsif Nkind (N2) = N_Subtype_Indication
11212 and then Is_Entity_Name (Original_Node (N2))
11214 Set_Associated_Node (N, Original_Node (N2));
11222 elsif Nkind (N) in N_Entity then
11227 Loc : constant Source_Ptr := Sloc (N);
11228 Qual : Node_Id := Empty;
11229 Typ : Entity_Id := Empty;
11232 use Atree.Unchecked_Access;
11233 -- This code section is part of implementing an untyped tree
11234 -- traversal, so it needs direct access to node fields.
11237 if Nkind (N) = N_Aggregate
11239 Nkind (N) = N_Extension_Aggregate
11241 N2 := Get_Associated_Node (N);
11248 -- In an instance within a generic, use the name of
11249 -- the actual and not the original generic parameter.
11250 -- If the actual is global in the current generic it
11251 -- must be preserved for its instantiation.
11253 if Nkind (Parent (Typ)) = N_Subtype_Declaration
11255 Present (Generic_Parent_Type (Parent (Typ)))
11257 Typ := Base_Type (Typ);
11258 Set_Etype (N2, Typ);
11264 or else not Is_Global (Typ)
11266 Set_Associated_Node (N, Empty);
11268 -- If the aggregate is an actual in a call, it has been
11269 -- resolved in the current context, to some local type.
11270 -- The enclosing call may have been disambiguated by the
11271 -- aggregate, and this disambiguation might fail at
11272 -- instantiation time because the type to which the
11273 -- aggregate did resolve is not preserved. In order to
11274 -- preserve some of this information, we wrap the
11275 -- aggregate in a qualified expression, using the id of
11276 -- its type. For further disambiguation we qualify the
11277 -- type name with its scope (if visible) because both
11278 -- id's will have corresponding entities in an instance.
11279 -- This resolves most of the problems with missing type
11280 -- information on aggregates in instances.
11282 if Nkind (N2) = Nkind (N)
11284 (Nkind (Parent (N2)) = N_Procedure_Call_Statement
11285 or else Nkind (Parent (N2)) = N_Function_Call)
11286 and then Comes_From_Source (Typ)
11288 if Is_Immediately_Visible (Scope (Typ)) then
11289 Nam := Make_Selected_Component (Loc,
11291 Make_Identifier (Loc, Chars (Scope (Typ))),
11293 Make_Identifier (Loc, Chars (Typ)));
11295 Nam := Make_Identifier (Loc, Chars (Typ));
11299 Make_Qualified_Expression (Loc,
11300 Subtype_Mark => Nam,
11301 Expression => Relocate_Node (N));
11305 Save_Global_Descendant (Field1 (N));
11306 Save_Global_Descendant (Field2 (N));
11307 Save_Global_Descendant (Field3 (N));
11308 Save_Global_Descendant (Field5 (N));
11310 if Present (Qual) then
11314 -- All other cases than aggregates
11317 Save_Global_Descendant (Field1 (N));
11318 Save_Global_Descendant (Field2 (N));
11319 Save_Global_Descendant (Field3 (N));
11320 Save_Global_Descendant (Field4 (N));
11321 Save_Global_Descendant (Field5 (N));
11325 end Save_References;
11327 -- Start of processing for Save_Global_References
11330 Gen_Scope := Current_Scope;
11332 -- If the generic unit is a child unit, references to entities in the
11333 -- parent are treated as local, because they will be resolved anew in
11334 -- the context of the instance of the parent.
11336 while Is_Child_Unit (Gen_Scope)
11337 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
11339 Gen_Scope := Scope (Gen_Scope);
11342 Save_References (N);
11343 end Save_Global_References;
11345 --------------------------------------
11346 -- Set_Copied_Sloc_For_Inlined_Body --
11347 --------------------------------------
11349 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
11351 Create_Instantiation_Source (N, E, True, S_Adjustment);
11352 end Set_Copied_Sloc_For_Inlined_Body;
11354 ---------------------
11355 -- Set_Instance_Of --
11356 ---------------------
11358 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
11360 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
11361 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
11362 Generic_Renamings.Increment_Last;
11363 end Set_Instance_Of;
11365 --------------------
11366 -- Set_Next_Assoc --
11367 --------------------
11369 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
11371 Generic_Renamings.Table (E).Next_In_HTable := Next;
11372 end Set_Next_Assoc;
11374 -------------------
11375 -- Start_Generic --
11376 -------------------
11378 procedure Start_Generic is
11380 -- ??? I am sure more things could be factored out in this routine.
11381 -- Should probably be done at a later stage.
11383 Generic_Flags.Increment_Last;
11384 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
11385 Inside_A_Generic := True;
11387 Expander_Mode_Save_And_Set (False);
11390 ----------------------
11391 -- Set_Instance_Env --
11392 ----------------------
11394 procedure Set_Instance_Env
11395 (Gen_Unit : Entity_Id;
11396 Act_Unit : Entity_Id)
11399 -- Regardless of the current mode, predefined units are analyzed in
11400 -- the most current Ada mode, and earlier version Ada checks do not
11401 -- apply to predefined units.
11403 Set_Opt_Config_Switches (
11404 Is_Internal_File_Name
11405 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
11406 Renamings_Included => True),
11407 Current_Sem_Unit = Main_Unit);
11409 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
11410 end Set_Instance_Env;
11416 procedure Switch_View (T : Entity_Id) is
11417 BT : constant Entity_Id := Base_Type (T);
11418 Priv_Elmt : Elmt_Id := No_Elmt;
11419 Priv_Sub : Entity_Id;
11422 -- T may be private but its base type may have been exchanged through
11423 -- some other occurrence, in which case there is nothing to switch
11424 -- besides T itself. Note that a private dependent subtype of a private
11425 -- type might not have been switched even if the base type has been,
11426 -- because of the last branch of Check_Private_View (see comment there).
11428 if not Is_Private_Type (BT) then
11429 Prepend_Elmt (Full_View (T), Exchanged_Views);
11430 Exchange_Declarations (T);
11434 Priv_Elmt := First_Elmt (Private_Dependents (BT));
11436 if Present (Full_View (BT)) then
11437 Prepend_Elmt (Full_View (BT), Exchanged_Views);
11438 Exchange_Declarations (BT);
11441 while Present (Priv_Elmt) loop
11442 Priv_Sub := (Node (Priv_Elmt));
11444 -- We avoid flipping the subtype if the Etype of its full view is
11445 -- private because this would result in a malformed subtype. This
11446 -- occurs when the Etype of the subtype full view is the full view of
11447 -- the base type (and since the base types were just switched, the
11448 -- subtype is pointing to the wrong view). This is currently the case
11449 -- for tagged record types, access types (maybe more?) and needs to
11450 -- be resolved. ???
11452 if Present (Full_View (Priv_Sub))
11453 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
11455 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
11456 Exchange_Declarations (Priv_Sub);
11459 Next_Elmt (Priv_Elmt);
11463 -----------------------------
11464 -- Valid_Default_Attribute --
11465 -----------------------------
11467 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
11468 Attr_Id : constant Attribute_Id :=
11469 Get_Attribute_Id (Attribute_Name (Def));
11470 T : constant Entity_Id := Entity (Prefix (Def));
11471 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
11484 F := First_Formal (Nam);
11485 while Present (F) loop
11486 Num_F := Num_F + 1;
11491 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
11492 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
11493 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
11494 Attribute_Unbiased_Rounding =>
11497 and then Is_Floating_Point_Type (T);
11499 when Attribute_Image | Attribute_Pred | Attribute_Succ |
11500 Attribute_Value | Attribute_Wide_Image |
11501 Attribute_Wide_Value =>
11502 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
11504 when Attribute_Max | Attribute_Min =>
11505 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
11507 when Attribute_Input =>
11508 OK := (Is_Fun and then Num_F = 1);
11510 when Attribute_Output | Attribute_Read | Attribute_Write =>
11511 OK := (not Is_Fun and then Num_F = 2);
11518 Error_Msg_N ("attribute reference has wrong profile for subprogram",
11521 end Valid_Default_Attribute;
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