1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Exp_Disp; use Exp_Disp;
33 with Fname; use Fname;
34 with Fname.UF; use Fname.UF;
35 with Freeze; use Freeze;
37 with Itypes; use Itypes;
39 with Lib.Load; use Lib.Load;
40 with Lib.Xref; use Lib.Xref;
41 with Nlists; use Nlists;
42 with Namet; use Namet;
43 with Nmake; use Nmake;
45 with Rident; use Rident;
46 with Restrict; use Restrict;
47 with Rtsfind; use Rtsfind;
49 with Sem_Aux; use Sem_Aux;
50 with Sem_Cat; use Sem_Cat;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch7; use Sem_Ch7;
54 with Sem_Ch8; use Sem_Ch8;
55 with Sem_Ch10; use Sem_Ch10;
56 with Sem_Ch13; use Sem_Ch13;
57 with Sem_Dim; use Sem_Dim;
58 with Sem_Disp; use Sem_Disp;
59 with Sem_Elab; use Sem_Elab;
60 with Sem_Elim; use Sem_Elim;
61 with Sem_Eval; use Sem_Eval;
62 with Sem_Prag; use Sem_Prag;
63 with Sem_Res; use Sem_Res;
64 with Sem_Type; use Sem_Type;
65 with Sem_Util; use Sem_Util;
66 with Sem_Warn; use Sem_Warn;
67 with Stand; use Stand;
68 with Sinfo; use Sinfo;
69 with Sinfo.CN; use Sinfo.CN;
70 with Sinput; use Sinput;
71 with Sinput.L; use Sinput.L;
72 with Snames; use Snames;
73 with Stringt; use Stringt;
74 with Uname; use Uname;
76 with Tbuild; use Tbuild;
77 with Uintp; use Uintp;
78 with Urealp; use Urealp;
82 package body Sem_Ch12 is
84 ----------------------------------------------------------
85 -- Implementation of Generic Analysis and Instantiation --
86 ----------------------------------------------------------
88 -- GNAT implements generics by macro expansion. No attempt is made to share
89 -- generic instantiations (for now). Analysis of a generic definition does
90 -- not perform any expansion action, but the expander must be called on the
91 -- tree for each instantiation, because the expansion may of course depend
92 -- on the generic actuals. All of this is best achieved as follows:
94 -- a) Semantic analysis of a generic unit is performed on a copy of the
95 -- tree for the generic unit. All tree modifications that follow analysis
96 -- do not affect the original tree. Links are kept between the original
97 -- tree and the copy, in order to recognize non-local references within
98 -- the generic, and propagate them to each instance (recall that name
99 -- resolution is done on the generic declaration: generics are not really
100 -- macros!). This is summarized in the following diagram:
102 -- .-----------. .----------.
103 -- | semantic |<--------------| generic |
105 -- | |==============>| |
106 -- |___________| global |__________|
117 -- b) Each instantiation copies the original tree, and inserts into it a
118 -- series of declarations that describe the mapping between generic formals
119 -- and actuals. For example, a generic In OUT parameter is an object
120 -- renaming of the corresponding actual, etc. Generic IN parameters are
121 -- constant declarations.
123 -- c) In order to give the right visibility for these renamings, we use
124 -- a different scheme for package and subprogram instantiations. For
125 -- packages, the list of renamings is inserted into the package
126 -- specification, before the visible declarations of the package. The
127 -- renamings are analyzed before any of the text of the instance, and are
128 -- thus visible at the right place. Furthermore, outside of the instance,
129 -- the generic parameters are visible and denote their corresponding
132 -- For subprograms, we create a container package to hold the renamings
133 -- and the subprogram instance itself. Analysis of the package makes the
134 -- renaming declarations visible to the subprogram. After analyzing the
135 -- package, the defining entity for the subprogram is touched-up so that
136 -- it appears declared in the current scope, and not inside the container
139 -- If the instantiation is a compilation unit, the container package is
140 -- given the same name as the subprogram instance. This ensures that
141 -- the elaboration procedure called by the binder, using the compilation
142 -- unit name, calls in fact the elaboration procedure for the package.
144 -- Not surprisingly, private types complicate this approach. By saving in
145 -- the original generic object the non-local references, we guarantee that
146 -- the proper entities are referenced at the point of instantiation.
147 -- However, for private types, this by itself does not insure that the
148 -- proper VIEW of the entity is used (the full type may be visible at the
149 -- point of generic definition, but not at instantiation, or vice-versa).
150 -- In order to reference the proper view, we special-case any reference
151 -- to private types in the generic object, by saving both views, one in
152 -- the generic and one in the semantic copy. At time of instantiation, we
153 -- check whether the two views are consistent, and exchange declarations if
154 -- necessary, in order to restore the correct visibility. Similarly, if
155 -- the instance view is private when the generic view was not, we perform
156 -- the exchange. After completing the instantiation, we restore the
157 -- current visibility. The flag Has_Private_View marks identifiers in the
158 -- the generic unit that require checking.
160 -- Visibility within nested generic units requires special handling.
161 -- Consider the following scheme:
163 -- type Global is ... -- outside of generic unit.
167 -- type Semi_Global is ... -- global to inner.
170 -- procedure inner (X1 : Global; X2 : Semi_Global);
172 -- procedure in2 is new inner (...); -- 4
175 -- package New_Outer is new Outer (...); -- 2
176 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
178 -- The semantic analysis of Outer captures all occurrences of Global.
179 -- The semantic analysis of Inner (at 1) captures both occurrences of
180 -- Global and Semi_Global.
182 -- At point 2 (instantiation of Outer), we also produce a generic copy
183 -- of Inner, even though Inner is, at that point, not being instantiated.
184 -- (This is just part of the semantic analysis of New_Outer).
186 -- Critically, references to Global within Inner must be preserved, while
187 -- references to Semi_Global should not preserved, because they must now
188 -- resolve to an entity within New_Outer. To distinguish between these, we
189 -- use a global variable, Current_Instantiated_Parent, which is set when
190 -- performing a generic copy during instantiation (at 2). This variable is
191 -- used when performing a generic copy that is not an instantiation, but
192 -- that is nested within one, as the occurrence of 1 within 2. The analysis
193 -- of a nested generic only preserves references that are global to the
194 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
195 -- determine whether a reference is external to the given parent.
197 -- The instantiation at point 3 requires no special treatment. The method
198 -- works as well for further nestings of generic units, but of course the
199 -- variable Current_Instantiated_Parent must be stacked because nested
200 -- instantiations can occur, e.g. the occurrence of 4 within 2.
202 -- The instantiation of package and subprogram bodies is handled in a
203 -- similar manner, except that it is delayed until after semantic
204 -- analysis is complete. In this fashion complex cross-dependencies
205 -- between several package declarations and bodies containing generics
206 -- can be compiled which otherwise would diagnose spurious circularities.
208 -- For example, it is possible to compile two packages A and B that
209 -- have the following structure:
211 -- package A is package B is
212 -- generic ... generic ...
213 -- package G_A is package G_B is
216 -- package body A is package body B is
217 -- package N_B is new G_B (..) package N_A is new G_A (..)
219 -- The table Pending_Instantiations in package Inline is used to keep
220 -- track of body instantiations that are delayed in this manner. Inline
221 -- handles the actual calls to do the body instantiations. This activity
222 -- is part of Inline, since the processing occurs at the same point, and
223 -- for essentially the same reason, as the handling of inlined routines.
225 ----------------------------------------------
226 -- Detection of Instantiation Circularities --
227 ----------------------------------------------
229 -- If we have a chain of instantiations that is circular, this is static
230 -- error which must be detected at compile time. The detection of these
231 -- circularities is carried out at the point that we insert a generic
232 -- instance spec or body. If there is a circularity, then the analysis of
233 -- the offending spec or body will eventually result in trying to load the
234 -- same unit again, and we detect this problem as we analyze the package
235 -- instantiation for the second time.
237 -- At least in some cases after we have detected the circularity, we get
238 -- into trouble if we try to keep going. The following flag is set if a
239 -- circularity is detected, and used to abandon compilation after the
240 -- messages have been posted.
242 Circularity_Detected : Boolean := False;
243 -- This should really be reset on encountering a new main unit, but in
244 -- practice we are not using multiple main units so it is not critical.
246 -------------------------------------------------
247 -- Formal packages and partial parametrization --
248 -------------------------------------------------
250 -- When compiling a generic, a formal package is a local instantiation. If
251 -- declared with a box, its generic formals are visible in the enclosing
252 -- generic. If declared with a partial list of actuals, those actuals that
253 -- are defaulted (covered by an Others clause, or given an explicit box
254 -- initialization) are also visible in the enclosing generic, while those
255 -- that have a corresponding actual are not.
257 -- In our source model of instantiation, the same visibility must be
258 -- present in the spec and body of an instance: the names of the formals
259 -- that are defaulted must be made visible within the instance, and made
260 -- invisible (hidden) after the instantiation is complete, so that they
261 -- are not accessible outside of the instance.
263 -- In a generic, a formal package is treated like a special instantiation.
264 -- Our Ada 95 compiler handled formals with and without box in different
265 -- ways. With partial parametrization, we use a single model for both.
266 -- We create a package declaration that consists of the specification of
267 -- the generic package, and a set of declarations that map the actuals
268 -- into local renamings, just as we do for bona fide instantiations. For
269 -- defaulted parameters and formals with a box, we copy directly the
270 -- declarations of the formal into this local package. The result is a
271 -- a package whose visible declarations may include generic formals. This
272 -- package is only used for type checking and visibility analysis, and
273 -- never reaches the back-end, so it can freely violate the placement
274 -- rules for generic formal declarations.
276 -- The list of declarations (renamings and copies of formals) is built
277 -- by Analyze_Associations, just as for regular instantiations.
279 -- At the point of instantiation, conformance checking must be applied only
280 -- to those parameters that were specified in the formal. We perform this
281 -- checking by creating another internal instantiation, this one including
282 -- only the renamings and the formals (the rest of the package spec is not
283 -- relevant to conformance checking). We can then traverse two lists: the
284 -- list of actuals in the instance that corresponds to the formal package,
285 -- and the list of actuals produced for this bogus instantiation. We apply
286 -- the conformance rules to those actuals that are not defaulted (i.e.
287 -- which still appear as generic formals.
289 -- When we compile an instance body we must make the right parameters
290 -- visible again. The predicate Is_Generic_Formal indicates which of the
291 -- formals should have its Is_Hidden flag reset.
293 -----------------------
294 -- Local subprograms --
295 -----------------------
297 procedure Abandon_Instantiation (N : Node_Id);
298 pragma No_Return (Abandon_Instantiation);
299 -- Posts an error message "instantiation abandoned" at the indicated node
300 -- and then raises the exception Instantiation_Error to do it.
302 procedure Analyze_Formal_Array_Type
303 (T : in out Entity_Id;
305 -- A formal array type is treated like an array type declaration, and
306 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
307 -- in-out, because in the case of an anonymous type the entity is
308 -- actually created in the procedure.
310 -- The following procedures treat other kinds of formal parameters
312 procedure Analyze_Formal_Derived_Interface_Type
317 procedure Analyze_Formal_Derived_Type
322 procedure Analyze_Formal_Interface_Type
327 -- The following subprograms create abbreviated declarations for formal
328 -- scalar types. We introduce an anonymous base of the proper class for
329 -- each of them, and define the formals as constrained first subtypes of
330 -- their bases. The bounds are expressions that are non-static in the
333 procedure Analyze_Formal_Decimal_Fixed_Point_Type
334 (T : Entity_Id; Def : Node_Id);
335 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
337 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
338 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
339 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
340 (T : Entity_Id; Def : Node_Id);
342 procedure Analyze_Formal_Private_Type
346 -- Creates a new private type, which does not require completion
348 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id);
349 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
351 procedure Analyze_Generic_Formal_Part (N : Node_Id);
352 -- Analyze generic formal part
354 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
355 -- Create a new access type with the given designated type
357 function Analyze_Associations
360 F_Copy : List_Id) return List_Id;
361 -- At instantiation time, build the list of associations between formals
362 -- and actuals. Each association becomes a renaming declaration for the
363 -- formal entity. F_Copy is the analyzed list of formals in the generic
364 -- copy. It is used to apply legality checks to the actuals. I_Node is the
365 -- instantiation node itself.
367 procedure Analyze_Subprogram_Instantiation
371 procedure Build_Instance_Compilation_Unit_Nodes
375 -- This procedure is used in the case where the generic instance of a
376 -- subprogram body or package body is a library unit. In this case, the
377 -- original library unit node for the generic instantiation must be
378 -- replaced by the resulting generic body, and a link made to a new
379 -- compilation unit node for the generic declaration. The argument N is
380 -- the original generic instantiation. Act_Body and Act_Decl are the body
381 -- and declaration of the instance (either package body and declaration
382 -- nodes or subprogram body and declaration nodes depending on the case).
383 -- On return, the node N has been rewritten with the actual body.
385 procedure Check_Access_Definition (N : Node_Id);
386 -- Subsidiary routine to null exclusion processing. Perform an assertion
387 -- check on Ada version and the presence of an access definition in N.
389 procedure Check_Formal_Packages (P_Id : Entity_Id);
390 -- Apply the following to all formal packages in generic associations
392 procedure Check_Formal_Package_Instance
393 (Formal_Pack : Entity_Id;
394 Actual_Pack : Entity_Id);
395 -- Verify that the actuals of the actual instance match the actuals of
396 -- the template for a formal package that is not declared with a box.
398 procedure Check_Forward_Instantiation (Decl : Node_Id);
399 -- If the generic is a local entity and the corresponding body has not
400 -- been seen yet, flag enclosing packages to indicate that it will be
401 -- elaborated after the generic body. Subprograms declared in the same
402 -- package cannot be inlined by the front-end because front-end inlining
403 -- requires a strict linear order of elaboration.
405 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id;
406 -- Check if some association between formals and actuals requires to make
407 -- visible primitives of a tagged type, and make those primitives visible.
408 -- Return the list of primitives whose visibility is modified (to restore
409 -- their visibility later through Restore_Hidden_Primitives). If no
410 -- candidate is found then return No_Elist.
412 procedure Check_Hidden_Child_Unit
414 Gen_Unit : Entity_Id;
415 Act_Decl_Id : Entity_Id);
416 -- If the generic unit is an implicit child instance within a parent
417 -- instance, we need to make an explicit test that it is not hidden by
418 -- a child instance of the same name and parent.
420 procedure Check_Generic_Actuals
421 (Instance : Entity_Id;
422 Is_Formal_Box : Boolean);
423 -- Similar to previous one. Check the actuals in the instantiation,
424 -- whose views can change between the point of instantiation and the point
425 -- of instantiation of the body. In addition, mark the generic renamings
426 -- as generic actuals, so that they are not compatible with other actuals.
427 -- Recurse on an actual that is a formal package whose declaration has
430 function Contains_Instance_Of
433 N : Node_Id) return Boolean;
434 -- Inner is instantiated within the generic Outer. Check whether Inner
435 -- directly or indirectly contains an instance of Outer or of one of its
436 -- parents, in the case of a subunit. Each generic unit holds a list of
437 -- the entities instantiated within (at any depth). This procedure
438 -- determines whether the set of such lists contains a cycle, i.e. an
439 -- illegal circular instantiation.
441 function Denotes_Formal_Package
443 On_Exit : Boolean := False;
444 Instance : Entity_Id := Empty) return Boolean;
445 -- Returns True if E is a formal package of an enclosing generic, or
446 -- the actual for such a formal in an enclosing instantiation. If such
447 -- a package is used as a formal in an nested generic, or as an actual
448 -- in a nested instantiation, the visibility of ITS formals should not
449 -- be modified. When called from within Restore_Private_Views, the flag
450 -- On_Exit is true, to indicate that the search for a possible enclosing
451 -- instance should ignore the current one. In that case Instance denotes
452 -- the declaration for which this is an actual. This declaration may be
453 -- an instantiation in the source, or the internal instantiation that
454 -- corresponds to the actual for a formal package.
456 function Earlier (N1, N2 : Node_Id) return Boolean;
457 -- Yields True if N1 and N2 appear in the same compilation unit,
458 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
459 -- traversal of the tree for the unit. Used to determine the placement
460 -- of freeze nodes for instance bodies that may depend on other instances.
462 function Find_Actual_Type
464 Gen_Type : Entity_Id) return Entity_Id;
465 -- When validating the actual types of a child instance, check whether
466 -- the formal is a formal type of the parent unit, and retrieve the current
467 -- actual for it. Typ is the entity in the analyzed formal type declaration
468 -- (component or index type of an array type, or designated type of an
469 -- access formal) and Gen_Type is the enclosing analyzed formal array
470 -- or access type. The desired actual may be a formal of a parent, or may
471 -- be declared in a formal package of a parent. In both cases it is a
472 -- generic actual type because it appears within a visible instance.
473 -- Finally, it may be declared in a parent unit without being a formal
474 -- of that unit, in which case it must be retrieved by visibility.
475 -- Ambiguities may still arise if two homonyms are declared in two formal
476 -- packages, and the prefix of the formal type may be needed to resolve
477 -- the ambiguity in the instance ???
479 function In_Same_Declarative_Part
481 Inst : Node_Id) return Boolean;
482 -- True if the instantiation Inst and the given freeze_node F_Node appear
483 -- within the same declarative part, ignoring subunits, but with no inter-
484 -- vening subprograms or concurrent units. Used to find the proper plave
485 -- for the freeze node of an instance, when the generic is declared in a
486 -- previous instance. If predicate is true, the freeze node of the instance
487 -- can be placed after the freeze node of the previous instance, Otherwise
488 -- it has to be placed at the end of the current declarative part.
490 function In_Main_Context (E : Entity_Id) return Boolean;
491 -- Check whether an instantiation is in the context of the main unit.
492 -- Used to determine whether its body should be elaborated to allow
493 -- front-end inlining.
495 procedure Set_Instance_Env
496 (Gen_Unit : Entity_Id;
497 Act_Unit : Entity_Id);
498 -- Save current instance on saved environment, to be used to determine
499 -- the global status of entities in nested instances. Part of Save_Env.
500 -- called after verifying that the generic unit is legal for the instance,
501 -- The procedure also examines whether the generic unit is a predefined
502 -- unit, in order to set configuration switches accordingly. As a result
503 -- the procedure must be called after analyzing and freezing the actuals.
505 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
506 -- Associate analyzed generic parameter with corresponding
507 -- instance. Used for semantic checks at instantiation time.
509 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
510 -- Traverse the Exchanged_Views list to see if a type was private
511 -- and has already been flipped during this phase of instantiation.
513 procedure Hide_Current_Scope;
514 -- When instantiating a generic child unit, the parent context must be
515 -- present, but the instance and all entities that may be generated
516 -- must be inserted in the current scope. We leave the current scope
517 -- on the stack, but make its entities invisible to avoid visibility
518 -- problems. This is reversed at the end of the instantiation. This is
519 -- not done for the instantiation of the bodies, which only require the
520 -- instances of the generic parents to be in scope.
522 procedure Install_Body
527 -- If the instantiation happens textually before the body of the generic,
528 -- the instantiation of the body must be analyzed after the generic body,
529 -- and not at the point of instantiation. Such early instantiations can
530 -- happen if the generic and the instance appear in a package declaration
531 -- because the generic body can only appear in the corresponding package
532 -- body. Early instantiations can also appear if generic, instance and
533 -- body are all in the declarative part of a subprogram or entry. Entities
534 -- of packages that are early instantiations are delayed, and their freeze
535 -- node appears after the generic body.
537 procedure Insert_Freeze_Node_For_Instance
540 -- N denotes a package or a subprogram instantiation and F_Node is the
541 -- associated freeze node. Insert the freeze node before the first source
542 -- body which follows immediately after N. If no such body is found, the
543 -- freeze node is inserted at the end of the declarative region which
546 procedure Freeze_Subprogram_Body
547 (Inst_Node : Node_Id;
549 Pack_Id : Entity_Id);
550 -- The generic body may appear textually after the instance, including
551 -- in the proper body of a stub, or within a different package instance.
552 -- Given that the instance can only be elaborated after the generic, we
553 -- place freeze_nodes for the instance and/or for packages that may enclose
554 -- the instance and the generic, so that the back-end can establish the
555 -- proper order of elaboration.
558 -- Establish environment for subsequent instantiation. Separated from
559 -- Save_Env because data-structures for visibility handling must be
560 -- initialized before call to Check_Generic_Child_Unit.
562 procedure Install_Formal_Packages (Par : Entity_Id);
563 -- Install the visible part of any formal of the parent that is a formal
564 -- package. Note that for the case of a formal package with a box, this
565 -- includes the formal part of the formal package (12.7(10/2)).
567 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
568 -- When compiling an instance of a child unit the parent (which is
569 -- itself an instance) is an enclosing scope that must be made
570 -- immediately visible. This procedure is also used to install the non-
571 -- generic parent of a generic child unit when compiling its body, so
572 -- that full views of types in the parent are made visible.
574 procedure Remove_Parent (In_Body : Boolean := False);
575 -- Reverse effect after instantiation of child is complete
577 procedure Install_Hidden_Primitives
578 (Prims_List : in out Elist_Id;
581 -- Remove suffix 'P' from hidden primitives of Act_T to match the
582 -- visibility of primitives of Gen_T. The list of primitives to which
583 -- the suffix is removed is added to Prims_List to restore them later.
585 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id);
586 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
589 procedure Inline_Instance_Body
591 Gen_Unit : Entity_Id;
593 -- If front-end inlining is requested, instantiate the package body,
594 -- and preserve the visibility of its compilation unit, to insure
595 -- that successive instantiations succeed.
597 -- The functions Instantiate_XXX perform various legality checks and build
598 -- the declarations for instantiated generic parameters. In all of these
599 -- Formal is the entity in the generic unit, Actual is the entity of
600 -- expression in the generic associations, and Analyzed_Formal is the
601 -- formal in the generic copy, which contains the semantic information to
602 -- be used to validate the actual.
604 function Instantiate_Object
607 Analyzed_Formal : Node_Id) return List_Id;
609 function Instantiate_Type
612 Analyzed_Formal : Node_Id;
613 Actual_Decls : List_Id) return List_Id;
615 function Instantiate_Formal_Subprogram
618 Analyzed_Formal : Node_Id) return Node_Id;
620 function Instantiate_Formal_Package
623 Analyzed_Formal : Node_Id) return List_Id;
624 -- If the formal package is declared with a box, special visibility rules
625 -- apply to its formals: they are in the visible part of the package. This
626 -- is true in the declarative region of the formal package, that is to say
627 -- in the enclosing generic or instantiation. For an instantiation, the
628 -- parameters of the formal package are made visible in an explicit step.
629 -- Furthermore, if the actual has a visible USE clause, these formals must
630 -- be made potentially use-visible as well. On exit from the enclosing
631 -- instantiation, the reverse must be done.
633 -- For a formal package declared without a box, there are conformance rules
634 -- that apply to the actuals in the generic declaration and the actuals of
635 -- the actual package in the enclosing instantiation. The simplest way to
636 -- apply these rules is to repeat the instantiation of the formal package
637 -- in the context of the enclosing instance, and compare the generic
638 -- associations of this instantiation with those of the actual package.
639 -- This internal instantiation only needs to contain the renamings of the
640 -- formals: the visible and private declarations themselves need not be
643 -- In Ada 2005, the formal package may be only partially parameterized.
644 -- In that case the visibility step must make visible those actuals whose
645 -- corresponding formals were given with a box. A final complication
646 -- involves inherited operations from formal derived types, which must
647 -- be visible if the type is.
649 function Is_In_Main_Unit (N : Node_Id) return Boolean;
650 -- Test if given node is in the main unit
652 procedure Load_Parent_Of_Generic
655 Body_Optional : Boolean := False);
656 -- If the generic appears in a separate non-generic library unit, load the
657 -- corresponding body to retrieve the body of the generic. N is the node
658 -- for the generic instantiation, Spec is the generic package declaration.
660 -- Body_Optional is a flag that indicates that the body is being loaded to
661 -- ensure that temporaries are generated consistently when there are other
662 -- instances in the current declarative part that precede the one being
663 -- loaded. In that case a missing body is acceptable.
665 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
666 -- Add the context clause of the unit containing a generic unit to a
667 -- compilation unit that is, or contains, an instantiation.
669 function Get_Associated_Node (N : Node_Id) return Node_Id;
670 -- In order to propagate semantic information back from the analyzed copy
671 -- to the original generic, we maintain links between selected nodes in the
672 -- generic and their corresponding copies. At the end of generic analysis,
673 -- the routine Save_Global_References traverses the generic tree, examines
674 -- the semantic information, and preserves the links to those nodes that
675 -- contain global information. At instantiation, the information from the
676 -- associated node is placed on the new copy, so that name resolution is
679 -- Three kinds of source nodes have associated nodes:
681 -- a) those that can reference (denote) entities, that is identifiers,
682 -- character literals, expanded_names, operator symbols, operators,
683 -- and attribute reference nodes. These nodes have an Entity field
684 -- and are the set of nodes that are in N_Has_Entity.
686 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
688 -- c) selected components (N_Selected_Component)
690 -- For the first class, the associated node preserves the entity if it is
691 -- global. If the generic contains nested instantiations, the associated
692 -- node itself has been recopied, and a chain of them must be followed.
694 -- For aggregates, the associated node allows retrieval of the type, which
695 -- may otherwise not appear in the generic. The view of this type may be
696 -- different between generic and instantiation, and the full view can be
697 -- installed before the instantiation is analyzed. For aggregates of type
698 -- extensions, the same view exchange may have to be performed for some of
699 -- the ancestor types, if their view is private at the point of
702 -- Nodes that are selected components in the parse tree may be rewritten
703 -- as expanded names after resolution, and must be treated as potential
704 -- entity holders, which is why they also have an Associated_Node.
706 -- Nodes that do not come from source, such as freeze nodes, do not appear
707 -- in the generic tree, and need not have an associated node.
709 -- The associated node is stored in the Associated_Node field. Note that
710 -- this field overlaps Entity, which is fine, because the whole point is
711 -- that we don't need or want the normal Entity field in this situation.
713 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
714 -- Within the generic part, entities in the formal package are
715 -- visible. To validate subsequent type declarations, indicate
716 -- the correspondence between the entities in the analyzed formal,
717 -- and the entities in the actual package. There are three packages
718 -- involved in the instantiation of a formal package: the parent
719 -- generic P1 which appears in the generic declaration, the fake
720 -- instantiation P2 which appears in the analyzed generic, and whose
721 -- visible entities may be used in subsequent formals, and the actual
722 -- P3 in the instance. To validate subsequent formals, me indicate
723 -- that the entities in P2 are mapped into those of P3. The mapping of
724 -- entities has to be done recursively for nested packages.
726 procedure Move_Freeze_Nodes
730 -- Freeze nodes can be generated in the analysis of a generic unit, but
731 -- will not be seen by the back-end. It is necessary to move those nodes
732 -- to the enclosing scope if they freeze an outer entity. We place them
733 -- at the end of the enclosing generic package, which is semantically
736 procedure Preanalyze_Actuals (N : Node_Id);
737 -- Analyze actuals to perform name resolution. Full resolution is done
738 -- later, when the expected types are known, but names have to be captured
739 -- before installing parents of generics, that are not visible for the
740 -- actuals themselves.
742 function True_Parent (N : Node_Id) return Node_Id;
743 -- For a subunit, return parent of corresponding stub, else return
746 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
747 -- Verify that an attribute that appears as the default for a formal
748 -- subprogram is a function or procedure with the correct profile.
750 -------------------------------------------
751 -- Data Structures for Generic Renamings --
752 -------------------------------------------
754 -- The map Generic_Renamings associates generic entities with their
755 -- corresponding actuals. Currently used to validate type instances. It
756 -- will eventually be used for all generic parameters to eliminate the
757 -- need for overload resolution in the instance.
759 type Assoc_Ptr is new Int;
761 Assoc_Null : constant Assoc_Ptr := -1;
766 Next_In_HTable : Assoc_Ptr;
769 package Generic_Renamings is new Table.Table
770 (Table_Component_Type => Assoc,
771 Table_Index_Type => Assoc_Ptr,
772 Table_Low_Bound => 0,
774 Table_Increment => 100,
775 Table_Name => "Generic_Renamings");
777 -- Variable to hold enclosing instantiation. When the environment is
778 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
780 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
782 -- Hash table for associations
784 HTable_Size : constant := 37;
785 type HTable_Range is range 0 .. HTable_Size - 1;
787 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
788 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
789 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
790 function Hash (F : Entity_Id) return HTable_Range;
792 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
793 Header_Num => HTable_Range,
795 Elmt_Ptr => Assoc_Ptr,
796 Null_Ptr => Assoc_Null,
797 Set_Next => Set_Next_Assoc,
800 Get_Key => Get_Gen_Id,
804 Exchanged_Views : Elist_Id;
805 -- This list holds the private views that have been exchanged during
806 -- instantiation to restore the visibility of the generic declaration.
807 -- (see comments above). After instantiation, the current visibility is
808 -- reestablished by means of a traversal of this list.
810 Hidden_Entities : Elist_Id;
811 -- This list holds the entities of the current scope that are removed
812 -- from immediate visibility when instantiating a child unit. Their
813 -- visibility is restored in Remove_Parent.
815 -- Because instantiations can be recursive, the following must be saved
816 -- on entry and restored on exit from an instantiation (spec or body).
817 -- This is done by the two procedures Save_Env and Restore_Env. For
818 -- package and subprogram instantiations (but not for the body instances)
819 -- the action of Save_Env is done in two steps: Init_Env is called before
820 -- Check_Generic_Child_Unit, because setting the parent instances requires
821 -- that the visibility data structures be properly initialized. Once the
822 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
824 Parent_Unit_Visible : Boolean := False;
825 -- Parent_Unit_Visible is used when the generic is a child unit, and
826 -- indicates whether the ultimate parent of the generic is visible in the
827 -- instantiation environment. It is used to reset the visibility of the
828 -- parent at the end of the instantiation (see Remove_Parent).
830 Instance_Parent_Unit : Entity_Id := Empty;
831 -- This records the ultimate parent unit of an instance of a generic
832 -- child unit and is used in conjunction with Parent_Unit_Visible to
833 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
835 type Instance_Env is record
836 Instantiated_Parent : Assoc;
837 Exchanged_Views : Elist_Id;
838 Hidden_Entities : Elist_Id;
839 Current_Sem_Unit : Unit_Number_Type;
840 Parent_Unit_Visible : Boolean := False;
841 Instance_Parent_Unit : Entity_Id := Empty;
842 Switches : Config_Switches_Type;
845 package Instance_Envs is new Table.Table (
846 Table_Component_Type => Instance_Env,
847 Table_Index_Type => Int,
848 Table_Low_Bound => 0,
850 Table_Increment => 100,
851 Table_Name => "Instance_Envs");
853 procedure Restore_Private_Views
854 (Pack_Id : Entity_Id;
855 Is_Package : Boolean := True);
856 -- Restore the private views of external types, and unmark the generic
857 -- renamings of actuals, so that they become compatible subtypes again.
858 -- For subprograms, Pack_Id is the package constructed to hold the
861 procedure Switch_View (T : Entity_Id);
862 -- Switch the partial and full views of a type and its private
863 -- dependents (i.e. its subtypes and derived types).
865 ------------------------------------
866 -- Structures for Error Reporting --
867 ------------------------------------
869 Instantiation_Node : Node_Id;
870 -- Used by subprograms that validate instantiation of formal parameters
871 -- where there might be no actual on which to place the error message.
872 -- Also used to locate the instantiation node for generic subunits.
874 Instantiation_Error : exception;
875 -- When there is a semantic error in the generic parameter matching,
876 -- there is no point in continuing the instantiation, because the
877 -- number of cascaded errors is unpredictable. This exception aborts
878 -- the instantiation process altogether.
880 S_Adjustment : Sloc_Adjustment;
881 -- Offset created for each node in an instantiation, in order to keep
882 -- track of the source position of the instantiation in each of its nodes.
883 -- A subsequent semantic error or warning on a construct of the instance
884 -- points to both places: the original generic node, and the point of
885 -- instantiation. See Sinput and Sinput.L for additional details.
887 ------------------------------------------------------------
888 -- Data structure for keeping track when inside a Generic --
889 ------------------------------------------------------------
891 -- The following table is used to save values of the Inside_A_Generic
892 -- flag (see spec of Sem) when they are saved by Start_Generic.
894 package Generic_Flags is new Table.Table (
895 Table_Component_Type => Boolean,
896 Table_Index_Type => Int,
897 Table_Low_Bound => 0,
899 Table_Increment => 200,
900 Table_Name => "Generic_Flags");
902 ---------------------------
903 -- Abandon_Instantiation --
904 ---------------------------
906 procedure Abandon_Instantiation (N : Node_Id) is
908 Error_Msg_N ("\instantiation abandoned!", N);
909 raise Instantiation_Error;
910 end Abandon_Instantiation;
912 --------------------------
913 -- Analyze_Associations --
914 --------------------------
916 function Analyze_Associations
919 F_Copy : List_Id) return List_Id
921 Actuals_To_Freeze : constant Elist_Id := New_Elmt_List;
922 Assoc : constant List_Id := New_List;
923 Default_Actuals : constant Elist_Id := New_Elmt_List;
924 Gen_Unit : constant Entity_Id :=
925 Defining_Entity (Parent (F_Copy));
929 Analyzed_Formal : Node_Id;
930 First_Named : Node_Id := Empty;
934 Saved_Formal : Node_Id;
936 Default_Formals : constant List_Id := New_List;
937 -- If an Others_Choice is present, some of the formals may be defaulted.
938 -- To simplify the treatment of visibility in an instance, we introduce
939 -- individual defaults for each such formal. These defaults are
940 -- appended to the list of associations and replace the Others_Choice.
942 Found_Assoc : Node_Id;
943 -- Association for the current formal being match. Empty if there are
944 -- no remaining actuals, or if there is no named association with the
945 -- name of the formal.
947 Is_Named_Assoc : Boolean;
948 Num_Matched : Int := 0;
949 Num_Actuals : Int := 0;
951 Others_Present : Boolean := False;
952 Others_Choice : Node_Id := Empty;
953 -- In Ada 2005, indicates partial parametrization of a formal
954 -- package. As usual an other association must be last in the list.
956 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id);
957 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
958 -- cannot have a named association for it. AI05-0025 extends this rule
959 -- to formals of formal packages by AI05-0025, and it also applies to
960 -- box-initialized formals.
962 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean;
963 -- Determine whether the parameter types and the return type of Subp
964 -- are fully defined at the point of instantiation.
966 function Matching_Actual
968 A_F : Entity_Id) return Node_Id;
969 -- Find actual that corresponds to a given a formal parameter. If the
970 -- actuals are positional, return the next one, if any. If the actuals
971 -- are named, scan the parameter associations to find the right one.
972 -- A_F is the corresponding entity in the analyzed generic,which is
973 -- placed on the selector name for ASIS use.
975 -- In Ada 2005, a named association may be given with a box, in which
976 -- case Matching_Actual sets Found_Assoc to the generic association,
977 -- but return Empty for the actual itself. In this case the code below
978 -- creates a corresponding declaration for the formal.
980 function Partial_Parametrization return Boolean;
981 -- Ada 2005: if no match is found for a given formal, check if the
982 -- association for it includes a box, or whether the associations
983 -- include an Others clause.
985 procedure Process_Default (F : Entity_Id);
986 -- Add a copy of the declaration of generic formal F to the list of
987 -- associations, and add an explicit box association for F if there
988 -- is none yet, and the default comes from an Others_Choice.
990 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean;
991 -- Determine whether Subp renames one of the subprograms defined in the
992 -- generated package Standard.
994 procedure Set_Analyzed_Formal;
995 -- Find the node in the generic copy that corresponds to a given formal.
996 -- The semantic information on this node is used to perform legality
997 -- checks on the actuals. Because semantic analysis can introduce some
998 -- anonymous entities or modify the declaration node itself, the
999 -- correspondence between the two lists is not one-one. In addition to
1000 -- anonymous types, the presence a formal equality will introduce an
1001 -- implicit declaration for the corresponding inequality.
1003 ----------------------------------------
1004 -- Check_Overloaded_Formal_Subprogram --
1005 ----------------------------------------
1007 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is
1008 Temp_Formal : Entity_Id;
1011 Temp_Formal := First (Formals);
1012 while Present (Temp_Formal) loop
1013 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration
1014 and then Temp_Formal /= Formal
1016 Chars (Defining_Unit_Name (Specification (Formal))) =
1017 Chars (Defining_Unit_Name (Specification (Temp_Formal)))
1019 if Present (Found_Assoc) then
1021 ("named association not allowed for overloaded formal",
1026 ("named association not allowed for overloaded formal",
1030 Abandon_Instantiation (Instantiation_Node);
1035 end Check_Overloaded_Formal_Subprogram;
1037 -------------------------------
1038 -- Has_Fully_Defined_Profile --
1039 -------------------------------
1041 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean is
1042 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean;
1043 -- Determine whethet type Typ is fully defined
1045 ---------------------------
1046 -- Is_Fully_Defined_Type --
1047 ---------------------------
1049 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean is
1051 -- A private type without a full view is not fully defined
1053 if Is_Private_Type (Typ)
1054 and then No (Full_View (Typ))
1058 -- An incomplete type is never fully defined
1060 elsif Is_Incomplete_Type (Typ) then
1063 -- All other types are fully defined
1068 end Is_Fully_Defined_Type;
1070 -- Local declarations
1074 -- Start of processing for Has_Fully_Defined_Profile
1077 -- Check the parameters
1079 Param := First_Formal (Subp);
1080 while Present (Param) loop
1081 if not Is_Fully_Defined_Type (Etype (Param)) then
1085 Next_Formal (Param);
1088 -- Check the return type
1090 return Is_Fully_Defined_Type (Etype (Subp));
1091 end Has_Fully_Defined_Profile;
1093 ---------------------
1094 -- Matching_Actual --
1095 ---------------------
1097 function Matching_Actual
1099 A_F : Entity_Id) return Node_Id
1105 Is_Named_Assoc := False;
1107 -- End of list of purely positional parameters
1109 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
1110 Found_Assoc := Empty;
1113 -- Case of positional parameter corresponding to current formal
1115 elsif No (Selector_Name (Actual)) then
1116 Found_Assoc := Actual;
1117 Act := Explicit_Generic_Actual_Parameter (Actual);
1118 Num_Matched := Num_Matched + 1;
1121 -- Otherwise scan list of named actuals to find the one with the
1122 -- desired name. All remaining actuals have explicit names.
1125 Is_Named_Assoc := True;
1126 Found_Assoc := Empty;
1130 while Present (Actual) loop
1131 if Chars (Selector_Name (Actual)) = Chars (F) then
1132 Set_Entity (Selector_Name (Actual), A_F);
1133 Set_Etype (Selector_Name (Actual), Etype (A_F));
1134 Generate_Reference (A_F, Selector_Name (Actual));
1135 Found_Assoc := Actual;
1136 Act := Explicit_Generic_Actual_Parameter (Actual);
1137 Num_Matched := Num_Matched + 1;
1145 -- Reset for subsequent searches. In most cases the named
1146 -- associations are in order. If they are not, we reorder them
1147 -- to avoid scanning twice the same actual. This is not just a
1148 -- question of efficiency: there may be multiple defaults with
1149 -- boxes that have the same name. In a nested instantiation we
1150 -- insert actuals for those defaults, and cannot rely on their
1151 -- names to disambiguate them.
1153 if Actual = First_Named then
1156 elsif Present (Actual) then
1157 Insert_Before (First_Named, Remove_Next (Prev));
1160 Actual := First_Named;
1163 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1164 Set_Used_As_Generic_Actual (Entity (Act));
1168 end Matching_Actual;
1170 -----------------------------
1171 -- Partial_Parametrization --
1172 -----------------------------
1174 function Partial_Parametrization return Boolean is
1176 return Others_Present
1177 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1178 end Partial_Parametrization;
1180 ---------------------
1181 -- Process_Default --
1182 ---------------------
1184 procedure Process_Default (F : Entity_Id) is
1185 Loc : constant Source_Ptr := Sloc (I_Node);
1186 F_Id : constant Entity_Id := Defining_Entity (F);
1192 -- Append copy of formal declaration to associations, and create new
1193 -- defining identifier for it.
1195 Decl := New_Copy_Tree (F);
1196 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id));
1198 if Nkind (F) in N_Formal_Subprogram_Declaration then
1199 Set_Defining_Unit_Name (Specification (Decl), Id);
1202 Set_Defining_Identifier (Decl, Id);
1205 Append (Decl, Assoc);
1207 if No (Found_Assoc) then
1209 Make_Generic_Association (Loc,
1210 Selector_Name => New_Occurrence_Of (Id, Loc),
1211 Explicit_Generic_Actual_Parameter => Empty);
1212 Set_Box_Present (Default);
1213 Append (Default, Default_Formals);
1215 end Process_Default;
1217 ---------------------------------
1218 -- Renames_Standard_Subprogram --
1219 ---------------------------------
1221 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean is
1226 while Present (Id) loop
1227 if Scope (Id) = Standard_Standard then
1235 end Renames_Standard_Subprogram;
1237 -------------------------
1238 -- Set_Analyzed_Formal --
1239 -------------------------
1241 procedure Set_Analyzed_Formal is
1245 while Present (Analyzed_Formal) loop
1246 Kind := Nkind (Analyzed_Formal);
1248 case Nkind (Formal) is
1250 when N_Formal_Subprogram_Declaration =>
1251 exit when Kind in N_Formal_Subprogram_Declaration
1254 (Defining_Unit_Name (Specification (Formal))) =
1256 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1258 when N_Formal_Package_Declaration =>
1259 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1260 N_Generic_Package_Declaration,
1261 N_Package_Declaration);
1263 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1267 -- Skip freeze nodes, and nodes inserted to replace
1268 -- unrecognized pragmas.
1271 Kind not in N_Formal_Subprogram_Declaration
1272 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1276 and then Chars (Defining_Identifier (Formal)) =
1277 Chars (Defining_Identifier (Analyzed_Formal));
1280 Next (Analyzed_Formal);
1282 end Set_Analyzed_Formal;
1284 -- Start of processing for Analyze_Associations
1287 Actuals := Generic_Associations (I_Node);
1289 if Present (Actuals) then
1291 -- Check for an Others choice, indicating a partial parametrization
1292 -- for a formal package.
1294 Actual := First (Actuals);
1295 while Present (Actual) loop
1296 if Nkind (Actual) = N_Others_Choice then
1297 Others_Present := True;
1298 Others_Choice := Actual;
1300 if Present (Next (Actual)) then
1301 Error_Msg_N ("others must be last association", Actual);
1304 -- This subprogram is used both for formal packages and for
1305 -- instantiations. For the latter, associations must all be
1308 if Nkind (I_Node) /= N_Formal_Package_Declaration
1309 and then Comes_From_Source (I_Node)
1312 ("others association not allowed in an instance",
1316 -- In any case, nothing to do after the others association
1320 elsif Box_Present (Actual)
1321 and then Comes_From_Source (I_Node)
1322 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1325 ("box association not allowed in an instance", Actual);
1331 -- If named associations are present, save first named association
1332 -- (it may of course be Empty) to facilitate subsequent name search.
1334 First_Named := First (Actuals);
1335 while Present (First_Named)
1336 and then Nkind (First_Named) /= N_Others_Choice
1337 and then No (Selector_Name (First_Named))
1339 Num_Actuals := Num_Actuals + 1;
1344 Named := First_Named;
1345 while Present (Named) loop
1346 if Nkind (Named) /= N_Others_Choice
1347 and then No (Selector_Name (Named))
1349 Error_Msg_N ("invalid positional actual after named one", Named);
1350 Abandon_Instantiation (Named);
1353 -- A named association may lack an actual parameter, if it was
1354 -- introduced for a default subprogram that turns out to be local
1355 -- to the outer instantiation.
1357 if Nkind (Named) /= N_Others_Choice
1358 and then Present (Explicit_Generic_Actual_Parameter (Named))
1360 Num_Actuals := Num_Actuals + 1;
1366 if Present (Formals) then
1367 Formal := First_Non_Pragma (Formals);
1368 Analyzed_Formal := First_Non_Pragma (F_Copy);
1370 if Present (Actuals) then
1371 Actual := First (Actuals);
1373 -- All formals should have default values
1379 while Present (Formal) loop
1380 Set_Analyzed_Formal;
1381 Saved_Formal := Next_Non_Pragma (Formal);
1383 case Nkind (Formal) is
1384 when N_Formal_Object_Declaration =>
1387 Defining_Identifier (Formal),
1388 Defining_Identifier (Analyzed_Formal));
1390 if No (Match) and then Partial_Parametrization then
1391 Process_Default (Formal);
1394 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1398 when N_Formal_Type_Declaration =>
1401 Defining_Identifier (Formal),
1402 Defining_Identifier (Analyzed_Formal));
1405 if Partial_Parametrization then
1406 Process_Default (Formal);
1409 Error_Msg_Sloc := Sloc (Gen_Unit);
1413 Defining_Identifier (Formal));
1414 Error_Msg_NE ("\in instantiation of & declared#",
1415 Instantiation_Node, Gen_Unit);
1416 Abandon_Instantiation (Instantiation_Node);
1423 (Formal, Match, Analyzed_Formal, Assoc),
1426 -- An instantiation is a freeze point for the actuals,
1427 -- unless this is a rewritten formal package, or the
1428 -- formal is an Ada 2012 formal incomplete type.
1430 if Nkind (I_Node) = N_Formal_Package_Declaration
1432 (Ada_Version >= Ada_2012
1434 Ekind (Defining_Identifier (Analyzed_Formal)) =
1440 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1444 -- A remote access-to-class-wide type is not a legal actual
1445 -- for a generic formal of an access type (E.2.2(17/2)).
1446 -- In GNAT an exception to this rule is introduced when
1447 -- the formal is marked as remote using implementation
1448 -- defined aspect/pragma Remote_Access_Type. In that case
1449 -- the actual must be remote as well.
1451 -- If the current instantiation is the construction of a
1452 -- local copy for a formal package the actuals may be
1453 -- defaulted, and there is no matching actual to check.
1455 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1457 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1458 N_Access_To_Object_Definition
1459 and then Present (Match)
1462 Formal_Ent : constant Entity_Id :=
1463 Defining_Identifier (Analyzed_Formal);
1465 if Is_Remote_Access_To_Class_Wide_Type (Entity (Match))
1466 = Is_Remote_Types (Formal_Ent)
1468 -- Remoteness of formal and actual match
1472 elsif Is_Remote_Types (Formal_Ent) then
1474 -- Remote formal, non-remote actual
1477 ("actual for& must be remote", Match, Formal_Ent);
1480 -- Non-remote formal, remote actual
1483 ("actual for& may not be remote",
1489 when N_Formal_Subprogram_Declaration =>
1492 (Defining_Unit_Name (Specification (Formal)),
1493 Defining_Unit_Name (Specification (Analyzed_Formal)));
1495 -- If the formal subprogram has the same name as another
1496 -- formal subprogram of the generic, then a named
1497 -- association is illegal (12.3(9)). Exclude named
1498 -- associations that are generated for a nested instance.
1501 and then Is_Named_Assoc
1502 and then Comes_From_Source (Found_Assoc)
1504 Check_Overloaded_Formal_Subprogram (Formal);
1507 -- If there is no corresponding actual, this may be case of
1508 -- partial parametrization, or else the formal has a default
1511 if No (Match) and then Partial_Parametrization then
1512 Process_Default (Formal);
1514 if Nkind (I_Node) = N_Formal_Package_Declaration then
1515 Check_Overloaded_Formal_Subprogram (Formal);
1520 Instantiate_Formal_Subprogram
1521 (Formal, Match, Analyzed_Formal));
1523 -- An instantiation is a freeze point for the actuals,
1524 -- unless this is a rewritten formal package.
1526 if Nkind (I_Node) /= N_Formal_Package_Declaration
1527 and then Nkind (Match) = N_Identifier
1528 and then Is_Subprogram (Entity (Match))
1530 -- The actual subprogram may rename a routine defined
1531 -- in Standard. Avoid freezing such renamings because
1532 -- subprograms coming from Standard cannot be frozen.
1535 not Renames_Standard_Subprogram (Entity (Match))
1537 -- If the actual subprogram comes from a different
1538 -- unit, it is already frozen, either by a body in
1539 -- that unit or by the end of the declarative part
1540 -- of the unit. This check avoids the freezing of
1541 -- subprograms defined in Standard which are used
1542 -- as generic actuals.
1544 and then In_Same_Code_Unit (Entity (Match), I_Node)
1545 and then Has_Fully_Defined_Profile (Entity (Match))
1547 -- Mark the subprogram as having a delayed freeze
1548 -- since this may be an out-of-order action.
1550 Set_Has_Delayed_Freeze (Entity (Match));
1551 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1555 -- If this is a nested generic, preserve default for later
1559 and then Box_Present (Formal)
1562 (Defining_Unit_Name (Specification (Last (Assoc))),
1566 when N_Formal_Package_Declaration =>
1569 Defining_Identifier (Formal),
1570 Defining_Identifier (Original_Node (Analyzed_Formal)));
1573 if Partial_Parametrization then
1574 Process_Default (Formal);
1577 Error_Msg_Sloc := Sloc (Gen_Unit);
1580 Instantiation_Node, Defining_Identifier (Formal));
1581 Error_Msg_NE ("\in instantiation of & declared#",
1582 Instantiation_Node, Gen_Unit);
1584 Abandon_Instantiation (Instantiation_Node);
1590 (Instantiate_Formal_Package
1591 (Formal, Match, Analyzed_Formal),
1595 -- For use type and use package appearing in the generic part,
1596 -- we have already copied them, so we can just move them where
1597 -- they belong (we mustn't recopy them since this would mess up
1598 -- the Sloc values).
1600 when N_Use_Package_Clause |
1601 N_Use_Type_Clause =>
1602 if Nkind (Original_Node (I_Node)) =
1603 N_Formal_Package_Declaration
1605 Append (New_Copy_Tree (Formal), Assoc);
1608 Append (Formal, Assoc);
1612 raise Program_Error;
1616 Formal := Saved_Formal;
1617 Next_Non_Pragma (Analyzed_Formal);
1620 if Num_Actuals > Num_Matched then
1621 Error_Msg_Sloc := Sloc (Gen_Unit);
1623 if Present (Selector_Name (Actual)) then
1625 ("unmatched actual&",
1626 Actual, Selector_Name (Actual));
1627 Error_Msg_NE ("\in instantiation of& declared#",
1631 ("unmatched actual in instantiation of& declared#",
1636 elsif Present (Actuals) then
1638 ("too many actuals in generic instantiation", Instantiation_Node);
1641 -- An instantiation freezes all generic actuals. The only exceptions
1642 -- to this are incomplete types and subprograms which are not fully
1643 -- defined at the point of instantiation.
1646 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze);
1648 while Present (Elmt) loop
1649 Freeze_Before (I_Node, Node (Elmt));
1654 -- If there are default subprograms, normalize the tree by adding
1655 -- explicit associations for them. This is required if the instance
1656 -- appears within a generic.
1664 Elmt := First_Elmt (Default_Actuals);
1665 while Present (Elmt) loop
1666 if No (Actuals) then
1667 Actuals := New_List;
1668 Set_Generic_Associations (I_Node, Actuals);
1671 Subp := Node (Elmt);
1673 Make_Generic_Association (Sloc (Subp),
1674 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1675 Explicit_Generic_Actual_Parameter =>
1676 New_Occurrence_Of (Subp, Sloc (Subp)));
1677 Mark_Rewrite_Insertion (New_D);
1678 Append_To (Actuals, New_D);
1683 -- If this is a formal package, normalize the parameter list by adding
1684 -- explicit box associations for the formals that are covered by an
1687 if not Is_Empty_List (Default_Formals) then
1688 Append_List (Default_Formals, Formals);
1692 end Analyze_Associations;
1694 -------------------------------
1695 -- Analyze_Formal_Array_Type --
1696 -------------------------------
1698 procedure Analyze_Formal_Array_Type
1699 (T : in out Entity_Id;
1705 -- Treated like a non-generic array declaration, with additional
1710 if Nkind (Def) = N_Constrained_Array_Definition then
1711 DSS := First (Discrete_Subtype_Definitions (Def));
1712 while Present (DSS) loop
1713 if Nkind_In (DSS, N_Subtype_Indication,
1715 N_Attribute_Reference)
1717 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1724 Array_Type_Declaration (T, Def);
1725 Set_Is_Generic_Type (Base_Type (T));
1727 if Ekind (Component_Type (T)) = E_Incomplete_Type
1728 and then No (Full_View (Component_Type (T)))
1730 Error_Msg_N ("premature usage of incomplete type", Def);
1732 -- Check that range constraint is not allowed on the component type
1733 -- of a generic formal array type (AARM 12.5.3(3))
1735 elsif Is_Internal (Component_Type (T))
1736 and then Present (Subtype_Indication (Component_Definition (Def)))
1737 and then Nkind (Original_Node
1738 (Subtype_Indication (Component_Definition (Def)))) =
1739 N_Subtype_Indication
1742 ("in a formal, a subtype indication can only be "
1743 & "a subtype mark (RM 12.5.3(3))",
1744 Subtype_Indication (Component_Definition (Def)));
1747 end Analyze_Formal_Array_Type;
1749 ---------------------------------------------
1750 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1751 ---------------------------------------------
1753 -- As for other generic types, we create a valid type representation with
1754 -- legal but arbitrary attributes, whose values are never considered
1755 -- static. For all scalar types we introduce an anonymous base type, with
1756 -- the same attributes. We choose the corresponding integer type to be
1757 -- Standard_Integer.
1758 -- Here and in other similar routines, the Sloc of the generated internal
1759 -- type must be the same as the sloc of the defining identifier of the
1760 -- formal type declaration, to provide proper source navigation.
1762 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1766 Loc : constant Source_Ptr := Sloc (Def);
1768 Base : constant Entity_Id :=
1770 (E_Decimal_Fixed_Point_Type,
1772 Sloc (Defining_Identifier (Parent (Def))), 'G');
1774 Int_Base : constant Entity_Id := Standard_Integer;
1775 Delta_Val : constant Ureal := Ureal_1;
1776 Digs_Val : constant Uint := Uint_6;
1781 Set_Etype (Base, Base);
1782 Set_Size_Info (Base, Int_Base);
1783 Set_RM_Size (Base, RM_Size (Int_Base));
1784 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1785 Set_Digits_Value (Base, Digs_Val);
1786 Set_Delta_Value (Base, Delta_Val);
1787 Set_Small_Value (Base, Delta_Val);
1788 Set_Scalar_Range (Base,
1790 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1791 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1793 Set_Is_Generic_Type (Base);
1794 Set_Parent (Base, Parent (Def));
1796 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1797 Set_Etype (T, Base);
1798 Set_Size_Info (T, Int_Base);
1799 Set_RM_Size (T, RM_Size (Int_Base));
1800 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1801 Set_Digits_Value (T, Digs_Val);
1802 Set_Delta_Value (T, Delta_Val);
1803 Set_Small_Value (T, Delta_Val);
1804 Set_Scalar_Range (T, Scalar_Range (Base));
1805 Set_Is_Constrained (T);
1807 Check_Restriction (No_Fixed_Point, Def);
1808 end Analyze_Formal_Decimal_Fixed_Point_Type;
1810 -------------------------------------------
1811 -- Analyze_Formal_Derived_Interface_Type --
1812 -------------------------------------------
1814 procedure Analyze_Formal_Derived_Interface_Type
1819 Loc : constant Source_Ptr := Sloc (Def);
1822 -- Rewrite as a type declaration of a derived type. This ensures that
1823 -- the interface list and primitive operations are properly captured.
1826 Make_Full_Type_Declaration (Loc,
1827 Defining_Identifier => T,
1828 Type_Definition => Def));
1830 Set_Is_Generic_Type (T);
1831 end Analyze_Formal_Derived_Interface_Type;
1833 ---------------------------------
1834 -- Analyze_Formal_Derived_Type --
1835 ---------------------------------
1837 procedure Analyze_Formal_Derived_Type
1842 Loc : constant Source_Ptr := Sloc (Def);
1843 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1847 Set_Is_Generic_Type (T);
1849 if Private_Present (Def) then
1851 Make_Private_Extension_Declaration (Loc,
1852 Defining_Identifier => T,
1853 Discriminant_Specifications => Discriminant_Specifications (N),
1854 Unknown_Discriminants_Present => Unk_Disc,
1855 Subtype_Indication => Subtype_Mark (Def),
1856 Interface_List => Interface_List (Def));
1858 Set_Abstract_Present (New_N, Abstract_Present (Def));
1859 Set_Limited_Present (New_N, Limited_Present (Def));
1860 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1864 Make_Full_Type_Declaration (Loc,
1865 Defining_Identifier => T,
1866 Discriminant_Specifications =>
1867 Discriminant_Specifications (Parent (T)),
1869 Make_Derived_Type_Definition (Loc,
1870 Subtype_Indication => Subtype_Mark (Def)));
1872 Set_Abstract_Present
1873 (Type_Definition (New_N), Abstract_Present (Def));
1875 (Type_Definition (New_N), Limited_Present (Def));
1882 if not Is_Composite_Type (T) then
1884 ("unknown discriminants not allowed for elementary types", N);
1886 Set_Has_Unknown_Discriminants (T);
1887 Set_Is_Constrained (T, False);
1891 -- If the parent type has a known size, so does the formal, which makes
1892 -- legal representation clauses that involve the formal.
1894 Set_Size_Known_At_Compile_Time
1895 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1896 end Analyze_Formal_Derived_Type;
1898 ----------------------------------
1899 -- Analyze_Formal_Discrete_Type --
1900 ----------------------------------
1902 -- The operations defined for a discrete types are those of an enumeration
1903 -- type. The size is set to an arbitrary value, for use in analyzing the
1906 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1907 Loc : constant Source_Ptr := Sloc (Def);
1911 Base : constant Entity_Id :=
1913 (E_Floating_Point_Type, Current_Scope,
1914 Sloc (Defining_Identifier (Parent (Def))), 'G');
1918 Set_Ekind (T, E_Enumeration_Subtype);
1919 Set_Etype (T, Base);
1922 Set_Is_Generic_Type (T);
1923 Set_Is_Constrained (T);
1925 -- For semantic analysis, the bounds of the type must be set to some
1926 -- non-static value. The simplest is to create attribute nodes for those
1927 -- bounds, that refer to the type itself. These bounds are never
1928 -- analyzed but serve as place-holders.
1931 Make_Attribute_Reference (Loc,
1932 Attribute_Name => Name_First,
1933 Prefix => New_Reference_To (T, Loc));
1937 Make_Attribute_Reference (Loc,
1938 Attribute_Name => Name_Last,
1939 Prefix => New_Reference_To (T, Loc));
1942 Set_Scalar_Range (T,
1947 Set_Ekind (Base, E_Enumeration_Type);
1948 Set_Etype (Base, Base);
1949 Init_Size (Base, 8);
1950 Init_Alignment (Base);
1951 Set_Is_Generic_Type (Base);
1952 Set_Scalar_Range (Base, Scalar_Range (T));
1953 Set_Parent (Base, Parent (Def));
1954 end Analyze_Formal_Discrete_Type;
1956 ----------------------------------
1957 -- Analyze_Formal_Floating_Type --
1958 ---------------------------------
1960 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1961 Base : constant Entity_Id :=
1963 (E_Floating_Point_Type, Current_Scope,
1964 Sloc (Defining_Identifier (Parent (Def))), 'G');
1967 -- The various semantic attributes are taken from the predefined type
1968 -- Float, just so that all of them are initialized. Their values are
1969 -- never used because no constant folding or expansion takes place in
1970 -- the generic itself.
1973 Set_Ekind (T, E_Floating_Point_Subtype);
1974 Set_Etype (T, Base);
1975 Set_Size_Info (T, (Standard_Float));
1976 Set_RM_Size (T, RM_Size (Standard_Float));
1977 Set_Digits_Value (T, Digits_Value (Standard_Float));
1978 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1979 Set_Is_Constrained (T);
1981 Set_Is_Generic_Type (Base);
1982 Set_Etype (Base, Base);
1983 Set_Size_Info (Base, (Standard_Float));
1984 Set_RM_Size (Base, RM_Size (Standard_Float));
1985 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1986 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1987 Set_Parent (Base, Parent (Def));
1989 Check_Restriction (No_Floating_Point, Def);
1990 end Analyze_Formal_Floating_Type;
1992 -----------------------------------
1993 -- Analyze_Formal_Interface_Type;--
1994 -----------------------------------
1996 procedure Analyze_Formal_Interface_Type
2001 Loc : constant Source_Ptr := Sloc (N);
2006 Make_Full_Type_Declaration (Loc,
2007 Defining_Identifier => T,
2008 Type_Definition => Def);
2012 Set_Is_Generic_Type (T);
2013 end Analyze_Formal_Interface_Type;
2015 ---------------------------------
2016 -- Analyze_Formal_Modular_Type --
2017 ---------------------------------
2019 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
2021 -- Apart from their entity kind, generic modular types are treated like
2022 -- signed integer types, and have the same attributes.
2024 Analyze_Formal_Signed_Integer_Type (T, Def);
2025 Set_Ekind (T, E_Modular_Integer_Subtype);
2026 Set_Ekind (Etype (T), E_Modular_Integer_Type);
2028 end Analyze_Formal_Modular_Type;
2030 ---------------------------------------
2031 -- Analyze_Formal_Object_Declaration --
2032 ---------------------------------------
2034 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
2035 E : constant Node_Id := Default_Expression (N);
2036 Id : constant Node_Id := Defining_Identifier (N);
2043 -- Determine the mode of the formal object
2045 if Out_Present (N) then
2046 K := E_Generic_In_Out_Parameter;
2048 if not In_Present (N) then
2049 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
2053 K := E_Generic_In_Parameter;
2056 if Present (Subtype_Mark (N)) then
2057 Find_Type (Subtype_Mark (N));
2058 T := Entity (Subtype_Mark (N));
2060 -- Verify that there is no redundant null exclusion
2062 if Null_Exclusion_Present (N) then
2063 if not Is_Access_Type (T) then
2065 ("null exclusion can only apply to an access type", N);
2067 elsif Can_Never_Be_Null (T) then
2069 ("`NOT NULL` not allowed (& already excludes null)",
2074 -- Ada 2005 (AI-423): Formal object with an access definition
2077 Check_Access_Definition (N);
2078 T := Access_Definition
2080 N => Access_Definition (N));
2083 if Ekind (T) = E_Incomplete_Type then
2085 Error_Node : Node_Id;
2088 if Present (Subtype_Mark (N)) then
2089 Error_Node := Subtype_Mark (N);
2091 Check_Access_Definition (N);
2092 Error_Node := Access_Definition (N);
2095 Error_Msg_N ("premature usage of incomplete type", Error_Node);
2099 if K = E_Generic_In_Parameter then
2101 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2103 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
2105 ("generic formal of mode IN must not be of limited type", N);
2106 Explain_Limited_Type (T, N);
2109 if Is_Abstract_Type (T) then
2111 ("generic formal of mode IN must not be of abstract type", N);
2115 Preanalyze_Spec_Expression (E, T);
2117 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
2119 ("initialization not allowed for limited types", E);
2120 Explain_Limited_Type (T, E);
2127 -- Case of generic IN OUT parameter
2130 -- If the formal has an unconstrained type, construct its actual
2131 -- subtype, as is done for subprogram formals. In this fashion, all
2132 -- its uses can refer to specific bounds.
2137 if (Is_Array_Type (T)
2138 and then not Is_Constrained (T))
2140 (Ekind (T) = E_Record_Type
2141 and then Has_Discriminants (T))
2144 Non_Freezing_Ref : constant Node_Id :=
2145 New_Reference_To (Id, Sloc (Id));
2149 -- Make sure the actual subtype doesn't generate bogus freezing
2151 Set_Must_Not_Freeze (Non_Freezing_Ref);
2152 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
2153 Insert_Before_And_Analyze (N, Decl);
2154 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
2157 Set_Actual_Subtype (Id, T);
2162 ("initialization not allowed for `IN OUT` formals", N);
2166 if Has_Aspects (N) then
2167 Analyze_Aspect_Specifications (N, Id);
2169 end Analyze_Formal_Object_Declaration;
2171 ----------------------------------------------
2172 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2173 ----------------------------------------------
2175 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2179 Loc : constant Source_Ptr := Sloc (Def);
2180 Base : constant Entity_Id :=
2182 (E_Ordinary_Fixed_Point_Type, Current_Scope,
2183 Sloc (Defining_Identifier (Parent (Def))), 'G');
2186 -- The semantic attributes are set for completeness only, their values
2187 -- will never be used, since all properties of the type are non-static.
2190 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
2191 Set_Etype (T, Base);
2192 Set_Size_Info (T, Standard_Integer);
2193 Set_RM_Size (T, RM_Size (Standard_Integer));
2194 Set_Small_Value (T, Ureal_1);
2195 Set_Delta_Value (T, Ureal_1);
2196 Set_Scalar_Range (T,
2198 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
2199 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
2200 Set_Is_Constrained (T);
2202 Set_Is_Generic_Type (Base);
2203 Set_Etype (Base, Base);
2204 Set_Size_Info (Base, Standard_Integer);
2205 Set_RM_Size (Base, RM_Size (Standard_Integer));
2206 Set_Small_Value (Base, Ureal_1);
2207 Set_Delta_Value (Base, Ureal_1);
2208 Set_Scalar_Range (Base, Scalar_Range (T));
2209 Set_Parent (Base, Parent (Def));
2211 Check_Restriction (No_Fixed_Point, Def);
2212 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2214 ----------------------------------------
2215 -- Analyze_Formal_Package_Declaration --
2216 ----------------------------------------
2218 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2219 Loc : constant Source_Ptr := Sloc (N);
2220 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2222 Gen_Id : constant Node_Id := Name (N);
2224 Gen_Unit : Entity_Id;
2226 Parent_Installed : Boolean := False;
2228 Parent_Instance : Entity_Id;
2229 Renaming_In_Par : Entity_Id;
2230 Associations : Boolean := True;
2232 Vis_Prims_List : Elist_Id := No_Elist;
2233 -- List of primitives made temporarily visible in the instantiation
2234 -- to match the visibility of the formal type
2236 function Build_Local_Package return Node_Id;
2237 -- The formal package is rewritten so that its parameters are replaced
2238 -- with corresponding declarations. For parameters with bona fide
2239 -- associations these declarations are created by Analyze_Associations
2240 -- as for a regular instantiation. For boxed parameters, we preserve
2241 -- the formal declarations and analyze them, in order to introduce
2242 -- entities of the right kind in the environment of the formal.
2244 -------------------------
2245 -- Build_Local_Package --
2246 -------------------------
2248 function Build_Local_Package return Node_Id is
2250 Pack_Decl : Node_Id;
2253 -- Within the formal, the name of the generic package is a renaming
2254 -- of the formal (as for a regular instantiation).
2257 Make_Package_Declaration (Loc,
2260 (Specification (Original_Node (Gen_Decl)),
2261 Empty, Instantiating => True));
2263 Renaming := Make_Package_Renaming_Declaration (Loc,
2264 Defining_Unit_Name =>
2265 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2266 Name => New_Occurrence_Of (Formal, Loc));
2268 if Nkind (Gen_Id) = N_Identifier
2269 and then Chars (Gen_Id) = Chars (Pack_Id)
2272 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2275 -- If the formal is declared with a box, or with an others choice,
2276 -- create corresponding declarations for all entities in the formal
2277 -- part, so that names with the proper types are available in the
2278 -- specification of the formal package.
2280 -- On the other hand, if there are no associations, then all the
2281 -- formals must have defaults, and this will be checked by the
2282 -- call to Analyze_Associations.
2285 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2288 Formal_Decl : Node_Id;
2291 -- TBA : for a formal package, need to recurse ???
2296 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2297 while Present (Formal_Decl) loop
2299 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2304 -- If generic associations are present, use Analyze_Associations to
2305 -- create the proper renaming declarations.
2309 Act_Tree : constant Node_Id :=
2311 (Original_Node (Gen_Decl), Empty,
2312 Instantiating => True);
2315 Generic_Renamings.Set_Last (0);
2316 Generic_Renamings_HTable.Reset;
2317 Instantiation_Node := N;
2320 Analyze_Associations
2321 (I_Node => Original_Node (N),
2322 Formals => Generic_Formal_Declarations (Act_Tree),
2323 F_Copy => Generic_Formal_Declarations (Gen_Decl));
2325 Vis_Prims_List := Check_Hidden_Primitives (Decls);
2329 Append (Renaming, To => Decls);
2331 -- Add generated declarations ahead of local declarations in
2334 if No (Visible_Declarations (Specification (Pack_Decl))) then
2335 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2338 (First (Visible_Declarations (Specification (Pack_Decl))),
2343 end Build_Local_Package;
2345 -- Start of processing for Analyze_Formal_Package_Declaration
2348 Text_IO_Kludge (Gen_Id);
2351 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2352 Gen_Unit := Entity (Gen_Id);
2354 -- Check for a formal package that is a package renaming
2356 if Present (Renamed_Object (Gen_Unit)) then
2358 -- Indicate that unit is used, before replacing it with renamed
2359 -- entity for use below.
2361 if In_Extended_Main_Source_Unit (N) then
2362 Set_Is_Instantiated (Gen_Unit);
2363 Generate_Reference (Gen_Unit, N);
2366 Gen_Unit := Renamed_Object (Gen_Unit);
2369 if Ekind (Gen_Unit) /= E_Generic_Package then
2370 Error_Msg_N ("expect generic package name", Gen_Id);
2374 elsif Gen_Unit = Current_Scope then
2376 ("generic package cannot be used as a formal package of itself",
2381 elsif In_Open_Scopes (Gen_Unit) then
2382 if Is_Compilation_Unit (Gen_Unit)
2383 and then Is_Child_Unit (Current_Scope)
2385 -- Special-case the error when the formal is a parent, and
2386 -- continue analysis to minimize cascaded errors.
2389 ("generic parent cannot be used as formal package "
2390 & "of a child unit",
2395 ("generic package cannot be used as a formal package "
2403 -- Check that name of formal package does not hide name of generic,
2404 -- or its leading prefix. This check must be done separately because
2405 -- the name of the generic has already been analyzed.
2408 Gen_Name : Entity_Id;
2412 while Nkind (Gen_Name) = N_Expanded_Name loop
2413 Gen_Name := Prefix (Gen_Name);
2416 if Chars (Gen_Name) = Chars (Pack_Id) then
2418 ("& is hidden within declaration of formal package",
2424 or else No (Generic_Associations (N))
2425 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2427 Associations := False;
2430 -- If there are no generic associations, the generic parameters appear
2431 -- as local entities and are instantiated like them. We copy the generic
2432 -- package declaration as if it were an instantiation, and analyze it
2433 -- like a regular package, except that we treat the formals as
2434 -- additional visible components.
2436 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2438 if In_Extended_Main_Source_Unit (N) then
2439 Set_Is_Instantiated (Gen_Unit);
2440 Generate_Reference (Gen_Unit, N);
2443 Formal := New_Copy (Pack_Id);
2444 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2447 -- Make local generic without formals. The formals will be replaced
2448 -- with internal declarations.
2450 New_N := Build_Local_Package;
2452 -- If there are errors in the parameter list, Analyze_Associations
2453 -- raises Instantiation_Error. Patch the declaration to prevent
2454 -- further exception propagation.
2457 when Instantiation_Error =>
2459 Enter_Name (Formal);
2460 Set_Ekind (Formal, E_Variable);
2461 Set_Etype (Formal, Any_Type);
2462 Restore_Hidden_Primitives (Vis_Prims_List);
2464 if Parent_Installed then
2472 Set_Defining_Unit_Name (Specification (New_N), Formal);
2473 Set_Generic_Parent (Specification (N), Gen_Unit);
2474 Set_Instance_Env (Gen_Unit, Formal);
2475 Set_Is_Generic_Instance (Formal);
2477 Enter_Name (Formal);
2478 Set_Ekind (Formal, E_Package);
2479 Set_Etype (Formal, Standard_Void_Type);
2480 Set_Inner_Instances (Formal, New_Elmt_List);
2481 Push_Scope (Formal);
2483 if Is_Child_Unit (Gen_Unit)
2484 and then Parent_Installed
2486 -- Similarly, we have to make the name of the formal visible in the
2487 -- parent instance, to resolve properly fully qualified names that
2488 -- may appear in the generic unit. The parent instance has been
2489 -- placed on the scope stack ahead of the current scope.
2491 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2494 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2495 Set_Ekind (Renaming_In_Par, E_Package);
2496 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2497 Set_Scope (Renaming_In_Par, Parent_Instance);
2498 Set_Parent (Renaming_In_Par, Parent (Formal));
2499 Set_Renamed_Object (Renaming_In_Par, Formal);
2500 Append_Entity (Renaming_In_Par, Parent_Instance);
2503 Analyze (Specification (N));
2505 -- The formals for which associations are provided are not visible
2506 -- outside of the formal package. The others are still declared by a
2507 -- formal parameter declaration.
2509 -- If there are no associations, the only local entity to hide is the
2510 -- generated package renaming itself.
2516 E := First_Entity (Formal);
2517 while Present (E) loop
2519 and then not Is_Generic_Formal (E)
2524 if Ekind (E) = E_Package
2525 and then Renamed_Entity (E) = Formal
2535 End_Package_Scope (Formal);
2536 Restore_Hidden_Primitives (Vis_Prims_List);
2538 if Parent_Installed then
2544 -- Inside the generic unit, the formal package is a regular package, but
2545 -- no body is needed for it. Note that after instantiation, the defining
2546 -- unit name we need is in the new tree and not in the original (see
2547 -- Package_Instantiation). A generic formal package is an instance, and
2548 -- can be used as an actual for an inner instance.
2550 Set_Has_Completion (Formal, True);
2552 -- Add semantic information to the original defining identifier.
2555 Set_Ekind (Pack_Id, E_Package);
2556 Set_Etype (Pack_Id, Standard_Void_Type);
2557 Set_Scope (Pack_Id, Scope (Formal));
2558 Set_Has_Completion (Pack_Id, True);
2561 if Has_Aspects (N) then
2562 Analyze_Aspect_Specifications (N, Pack_Id);
2564 end Analyze_Formal_Package_Declaration;
2566 ---------------------------------
2567 -- Analyze_Formal_Private_Type --
2568 ---------------------------------
2570 procedure Analyze_Formal_Private_Type
2576 New_Private_Type (N, T, Def);
2578 -- Set the size to an arbitrary but legal value
2580 Set_Size_Info (T, Standard_Integer);
2581 Set_RM_Size (T, RM_Size (Standard_Integer));
2582 end Analyze_Formal_Private_Type;
2584 ------------------------------------
2585 -- Analyze_Formal_Incomplete_Type --
2586 ------------------------------------
2588 procedure Analyze_Formal_Incomplete_Type
2594 Set_Ekind (T, E_Incomplete_Type);
2596 Set_Private_Dependents (T, New_Elmt_List);
2598 if Tagged_Present (Def) then
2599 Set_Is_Tagged_Type (T);
2600 Make_Class_Wide_Type (T);
2601 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2603 end Analyze_Formal_Incomplete_Type;
2605 ----------------------------------------
2606 -- Analyze_Formal_Signed_Integer_Type --
2607 ----------------------------------------
2609 procedure Analyze_Formal_Signed_Integer_Type
2613 Base : constant Entity_Id :=
2615 (E_Signed_Integer_Type,
2617 Sloc (Defining_Identifier (Parent (Def))), 'G');
2622 Set_Ekind (T, E_Signed_Integer_Subtype);
2623 Set_Etype (T, Base);
2624 Set_Size_Info (T, Standard_Integer);
2625 Set_RM_Size (T, RM_Size (Standard_Integer));
2626 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2627 Set_Is_Constrained (T);
2629 Set_Is_Generic_Type (Base);
2630 Set_Size_Info (Base, Standard_Integer);
2631 Set_RM_Size (Base, RM_Size (Standard_Integer));
2632 Set_Etype (Base, Base);
2633 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2634 Set_Parent (Base, Parent (Def));
2635 end Analyze_Formal_Signed_Integer_Type;
2637 -------------------------------------------
2638 -- Analyze_Formal_Subprogram_Declaration --
2639 -------------------------------------------
2641 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2642 Spec : constant Node_Id := Specification (N);
2643 Def : constant Node_Id := Default_Name (N);
2644 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2652 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2653 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2657 Analyze_Subprogram_Declaration (N);
2658 Set_Is_Formal_Subprogram (Nam);
2659 Set_Has_Completion (Nam);
2661 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2662 Set_Is_Abstract_Subprogram (Nam);
2663 Set_Is_Dispatching_Operation (Nam);
2666 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2668 if No (Ctrl_Type) then
2670 ("abstract formal subprogram must have a controlling type",
2673 Check_Controlling_Formals (Ctrl_Type, Nam);
2678 -- Default name is resolved at the point of instantiation
2680 if Box_Present (N) then
2683 -- Else default is bound at the point of generic declaration
2685 elsif Present (Def) then
2686 if Nkind (Def) = N_Operator_Symbol then
2687 Find_Direct_Name (Def);
2689 elsif Nkind (Def) /= N_Attribute_Reference then
2693 -- For an attribute reference, analyze the prefix and verify
2694 -- that it has the proper profile for the subprogram.
2696 Analyze (Prefix (Def));
2697 Valid_Default_Attribute (Nam, Def);
2701 -- Default name may be overloaded, in which case the interpretation
2702 -- with the correct profile must be selected, as for a renaming.
2703 -- If the definition is an indexed component, it must denote a
2704 -- member of an entry family. If it is a selected component, it
2705 -- can be a protected operation.
2707 if Etype (Def) = Any_Type then
2710 elsif Nkind (Def) = N_Selected_Component then
2711 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2712 Error_Msg_N ("expect valid subprogram name as default", Def);
2715 elsif Nkind (Def) = N_Indexed_Component then
2716 if Is_Entity_Name (Prefix (Def)) then
2717 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2718 Error_Msg_N ("expect valid subprogram name as default", Def);
2721 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2722 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2725 Error_Msg_N ("expect valid subprogram name as default", Def);
2729 Error_Msg_N ("expect valid subprogram name as default", Def);
2733 elsif Nkind (Def) = N_Character_Literal then
2735 -- Needs some type checks: subprogram should be parameterless???
2737 Resolve (Def, (Etype (Nam)));
2739 elsif not Is_Entity_Name (Def)
2740 or else not Is_Overloadable (Entity (Def))
2742 Error_Msg_N ("expect valid subprogram name as default", Def);
2745 elsif not Is_Overloaded (Def) then
2746 Subp := Entity (Def);
2749 Error_Msg_N ("premature usage of formal subprogram", Def);
2751 elsif not Entity_Matches_Spec (Subp, Nam) then
2752 Error_Msg_N ("no visible entity matches specification", Def);
2755 -- More than one interpretation, so disambiguate as for a renaming
2760 I1 : Interp_Index := 0;
2766 Get_First_Interp (Def, I, It);
2767 while Present (It.Nam) loop
2768 if Entity_Matches_Spec (It.Nam, Nam) then
2769 if Subp /= Any_Id then
2770 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2772 if It1 = No_Interp then
2773 Error_Msg_N ("ambiguous default subprogram", Def);
2786 Get_Next_Interp (I, It);
2790 if Subp /= Any_Id then
2792 -- Subprogram found, generate reference to it
2794 Set_Entity (Def, Subp);
2795 Generate_Reference (Subp, Def);
2798 Error_Msg_N ("premature usage of formal subprogram", Def);
2800 elsif Ekind (Subp) /= E_Operator then
2801 Check_Mode_Conformant (Subp, Nam);
2805 Error_Msg_N ("no visible subprogram matches specification", N);
2811 if Has_Aspects (N) then
2812 Analyze_Aspect_Specifications (N, Nam);
2815 end Analyze_Formal_Subprogram_Declaration;
2817 -------------------------------------
2818 -- Analyze_Formal_Type_Declaration --
2819 -------------------------------------
2821 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2822 Def : constant Node_Id := Formal_Type_Definition (N);
2826 T := Defining_Identifier (N);
2828 if Present (Discriminant_Specifications (N))
2829 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2832 ("discriminants not allowed for this formal type", T);
2835 -- Enter the new name, and branch to specific routine
2838 when N_Formal_Private_Type_Definition =>
2839 Analyze_Formal_Private_Type (N, T, Def);
2841 when N_Formal_Derived_Type_Definition =>
2842 Analyze_Formal_Derived_Type (N, T, Def);
2844 when N_Formal_Incomplete_Type_Definition =>
2845 Analyze_Formal_Incomplete_Type (T, Def);
2847 when N_Formal_Discrete_Type_Definition =>
2848 Analyze_Formal_Discrete_Type (T, Def);
2850 when N_Formal_Signed_Integer_Type_Definition =>
2851 Analyze_Formal_Signed_Integer_Type (T, Def);
2853 when N_Formal_Modular_Type_Definition =>
2854 Analyze_Formal_Modular_Type (T, Def);
2856 when N_Formal_Floating_Point_Definition =>
2857 Analyze_Formal_Floating_Type (T, Def);
2859 when N_Formal_Ordinary_Fixed_Point_Definition =>
2860 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2862 when N_Formal_Decimal_Fixed_Point_Definition =>
2863 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2865 when N_Array_Type_Definition =>
2866 Analyze_Formal_Array_Type (T, Def);
2868 when N_Access_To_Object_Definition |
2869 N_Access_Function_Definition |
2870 N_Access_Procedure_Definition =>
2871 Analyze_Generic_Access_Type (T, Def);
2873 -- Ada 2005: a interface declaration is encoded as an abstract
2874 -- record declaration or a abstract type derivation.
2876 when N_Record_Definition =>
2877 Analyze_Formal_Interface_Type (N, T, Def);
2879 when N_Derived_Type_Definition =>
2880 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2886 raise Program_Error;
2890 Set_Is_Generic_Type (T);
2892 if Has_Aspects (N) then
2893 Analyze_Aspect_Specifications (N, T);
2895 end Analyze_Formal_Type_Declaration;
2897 ------------------------------------
2898 -- Analyze_Function_Instantiation --
2899 ------------------------------------
2901 procedure Analyze_Function_Instantiation (N : Node_Id) is
2903 Analyze_Subprogram_Instantiation (N, E_Function);
2904 end Analyze_Function_Instantiation;
2906 ---------------------------------
2907 -- Analyze_Generic_Access_Type --
2908 ---------------------------------
2910 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2914 if Nkind (Def) = N_Access_To_Object_Definition then
2915 Access_Type_Declaration (T, Def);
2917 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2918 and then No (Full_View (Designated_Type (T)))
2919 and then not Is_Generic_Type (Designated_Type (T))
2921 Error_Msg_N ("premature usage of incomplete type", Def);
2923 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2925 ("only a subtype mark is allowed in a formal", Def);
2929 Access_Subprogram_Declaration (T, Def);
2931 end Analyze_Generic_Access_Type;
2933 ---------------------------------
2934 -- Analyze_Generic_Formal_Part --
2935 ---------------------------------
2937 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2938 Gen_Parm_Decl : Node_Id;
2941 -- The generic formals are processed in the scope of the generic unit,
2942 -- where they are immediately visible. The scope is installed by the
2945 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2947 while Present (Gen_Parm_Decl) loop
2948 Analyze (Gen_Parm_Decl);
2949 Next (Gen_Parm_Decl);
2952 Generate_Reference_To_Generic_Formals (Current_Scope);
2953 end Analyze_Generic_Formal_Part;
2955 ------------------------------------------
2956 -- Analyze_Generic_Package_Declaration --
2957 ------------------------------------------
2959 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2960 Loc : constant Source_Ptr := Sloc (N);
2963 Save_Parent : Node_Id;
2965 Decls : constant List_Id :=
2966 Visible_Declarations (Specification (N));
2970 Check_SPARK_Restriction ("generic is not allowed", N);
2972 -- We introduce a renaming of the enclosing package, to have a usable
2973 -- entity as the prefix of an expanded name for a local entity of the
2974 -- form Par.P.Q, where P is the generic package. This is because a local
2975 -- entity named P may hide it, so that the usual visibility rules in
2976 -- the instance will not resolve properly.
2979 Make_Package_Renaming_Declaration (Loc,
2980 Defining_Unit_Name =>
2981 Make_Defining_Identifier (Loc,
2982 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2983 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2985 if Present (Decls) then
2986 Decl := First (Decls);
2987 while Present (Decl)
2988 and then Nkind (Decl) = N_Pragma
2993 if Present (Decl) then
2994 Insert_Before (Decl, Renaming);
2996 Append (Renaming, Visible_Declarations (Specification (N)));
3000 Set_Visible_Declarations (Specification (N), New_List (Renaming));
3003 -- Create copy of generic unit, and save for instantiation. If the unit
3004 -- is a child unit, do not copy the specifications for the parent, which
3005 -- are not part of the generic tree.
3007 Save_Parent := Parent_Spec (N);
3008 Set_Parent_Spec (N, Empty);
3010 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3011 Set_Parent_Spec (New_N, Save_Parent);
3013 Id := Defining_Entity (N);
3014 Generate_Definition (Id);
3016 -- Expansion is not applied to generic units
3021 Set_Ekind (Id, E_Generic_Package);
3022 Set_Etype (Id, Standard_Void_Type);
3024 Enter_Generic_Scope (Id);
3025 Set_Inner_Instances (Id, New_Elmt_List);
3027 Set_Categorization_From_Pragmas (N);
3028 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3030 -- Link the declaration of the generic homonym in the generic copy to
3031 -- the package it renames, so that it is always resolved properly.
3033 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
3034 Set_Entity (Associated_Node (Name (Renaming)), Id);
3036 -- For a library unit, we have reconstructed the entity for the unit,
3037 -- and must reset it in the library tables.
3039 if Nkind (Parent (N)) = N_Compilation_Unit then
3040 Set_Cunit_Entity (Current_Sem_Unit, Id);
3043 Analyze_Generic_Formal_Part (N);
3045 -- After processing the generic formals, analysis proceeds as for a
3046 -- non-generic package.
3048 Analyze (Specification (N));
3050 Validate_Categorization_Dependency (N, Id);
3054 End_Package_Scope (Id);
3055 Exit_Generic_Scope (Id);
3057 if Nkind (Parent (N)) /= N_Compilation_Unit then
3058 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
3059 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
3060 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
3063 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3064 Validate_RT_RAT_Component (N);
3066 -- If this is a spec without a body, check that generic parameters
3069 if not Body_Required (Parent (N)) then
3070 Check_References (Id);
3074 if Has_Aspects (N) then
3075 Analyze_Aspect_Specifications (N, Id);
3077 end Analyze_Generic_Package_Declaration;
3079 --------------------------------------------
3080 -- Analyze_Generic_Subprogram_Declaration --
3081 --------------------------------------------
3083 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
3088 Result_Type : Entity_Id;
3089 Save_Parent : Node_Id;
3093 Check_SPARK_Restriction ("generic is not allowed", N);
3095 -- Create copy of generic unit, and save for instantiation. If the unit
3096 -- is a child unit, do not copy the specifications for the parent, which
3097 -- are not part of the generic tree.
3099 Save_Parent := Parent_Spec (N);
3100 Set_Parent_Spec (N, Empty);
3102 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3103 Set_Parent_Spec (New_N, Save_Parent);
3106 -- The aspect specifications are not attached to the tree, and must
3107 -- be copied and attached to the generic copy explicitly.
3109 if Present (Aspect_Specifications (New_N)) then
3111 Aspects : constant List_Id := Aspect_Specifications (N);
3113 Set_Has_Aspects (N, False);
3114 Move_Aspects (New_N, N);
3115 Set_Has_Aspects (Original_Node (N), False);
3116 Set_Aspect_Specifications (Original_Node (N), Aspects);
3120 Spec := Specification (N);
3121 Id := Defining_Entity (Spec);
3122 Generate_Definition (Id);
3123 Set_Contract (Id, Make_Contract (Sloc (Id)));
3125 if Nkind (Id) = N_Defining_Operator_Symbol then
3127 ("operator symbol not allowed for generic subprogram", Id);
3134 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
3136 Enter_Generic_Scope (Id);
3137 Set_Inner_Instances (Id, New_Elmt_List);
3138 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3140 Analyze_Generic_Formal_Part (N);
3142 Formals := Parameter_Specifications (Spec);
3144 if Present (Formals) then
3145 Process_Formals (Formals, Spec);
3148 if Nkind (Spec) = N_Function_Specification then
3149 Set_Ekind (Id, E_Generic_Function);
3151 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
3152 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
3153 Set_Etype (Id, Result_Type);
3155 -- Check restriction imposed by AI05-073: a generic function
3156 -- cannot return an abstract type or an access to such.
3158 -- This is a binding interpretation should it apply to earlier
3159 -- versions of Ada as well as Ada 2012???
3161 if Is_Abstract_Type (Designated_Type (Result_Type))
3162 and then Ada_Version >= Ada_2012
3164 Error_Msg_N ("generic function cannot have an access result"
3165 & " that designates an abstract type", Spec);
3169 Find_Type (Result_Definition (Spec));
3170 Typ := Entity (Result_Definition (Spec));
3172 if Is_Abstract_Type (Typ)
3173 and then Ada_Version >= Ada_2012
3176 ("generic function cannot have abstract result type", Spec);
3179 -- If a null exclusion is imposed on the result type, then create
3180 -- a null-excluding itype (an access subtype) and use it as the
3181 -- function's Etype.
3183 if Is_Access_Type (Typ)
3184 and then Null_Exclusion_Present (Spec)
3187 Create_Null_Excluding_Itype
3189 Related_Nod => Spec,
3190 Scope_Id => Defining_Unit_Name (Spec)));
3192 Set_Etype (Id, Typ);
3197 Set_Ekind (Id, E_Generic_Procedure);
3198 Set_Etype (Id, Standard_Void_Type);
3201 -- For a library unit, we have reconstructed the entity for the unit,
3202 -- and must reset it in the library tables. We also make sure that
3203 -- Body_Required is set properly in the original compilation unit node.
3205 if Nkind (Parent (N)) = N_Compilation_Unit then
3206 Set_Cunit_Entity (Current_Sem_Unit, Id);
3207 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3210 Set_Categorization_From_Pragmas (N);
3211 Validate_Categorization_Dependency (N, Id);
3213 Save_Global_References (Original_Node (N));
3215 -- For ASIS purposes, convert any postcondition, precondition pragmas
3216 -- into aspects, if N is not a compilation unit by itself, in order to
3217 -- enable the analysis of expressions inside the corresponding PPC
3220 if ASIS_Mode and then Is_List_Member (N) then
3221 Make_Aspect_For_PPC_In_Gen_Sub_Decl (N);
3224 -- To capture global references, analyze the expressions of aspects,
3225 -- and propagate information to original tree. Note that in this case
3226 -- analysis of attributes is not delayed until the freeze point.
3228 -- It seems very hard to recreate the proper visibility of the generic
3229 -- subprogram at a later point because the analysis of an aspect may
3230 -- create pragmas after the generic copies have been made ???
3232 if Has_Aspects (N) then
3237 Aspect := First (Aspect_Specifications (N));
3238 while Present (Aspect) loop
3239 if Get_Aspect_Id (Chars (Identifier (Aspect)))
3242 Analyze (Expression (Aspect));
3247 Aspect := First (Aspect_Specifications (Original_Node (N)));
3248 while Present (Aspect) loop
3249 Save_Global_References (Expression (Aspect));
3257 Exit_Generic_Scope (Id);
3258 Generate_Reference_To_Formals (Id);
3260 List_Inherited_Pre_Post_Aspects (Id);
3261 end Analyze_Generic_Subprogram_Declaration;
3263 -----------------------------------
3264 -- Analyze_Package_Instantiation --
3265 -----------------------------------
3267 procedure Analyze_Package_Instantiation (N : Node_Id) is
3268 Loc : constant Source_Ptr := Sloc (N);
3269 Gen_Id : constant Node_Id := Name (N);
3272 Act_Decl_Name : Node_Id;
3273 Act_Decl_Id : Entity_Id;
3278 Gen_Unit : Entity_Id;
3280 Is_Actual_Pack : constant Boolean :=
3281 Is_Internal (Defining_Entity (N));
3283 Env_Installed : Boolean := False;
3284 Parent_Installed : Boolean := False;
3285 Renaming_List : List_Id;
3286 Unit_Renaming : Node_Id;
3287 Needs_Body : Boolean;
3288 Inline_Now : Boolean := False;
3290 Save_Style_Check : constant Boolean := Style_Check;
3291 -- Save style check mode for restore on exit
3293 procedure Delay_Descriptors (E : Entity_Id);
3294 -- Delay generation of subprogram descriptors for given entity
3296 function Might_Inline_Subp return Boolean;
3297 -- If inlining is active and the generic contains inlined subprograms,
3298 -- we instantiate the body. This may cause superfluous instantiations,
3299 -- but it is simpler than detecting the need for the body at the point
3300 -- of inlining, when the context of the instance is not available.
3302 -----------------------
3303 -- Delay_Descriptors --
3304 -----------------------
3306 procedure Delay_Descriptors (E : Entity_Id) is
3308 if not Delay_Subprogram_Descriptors (E) then
3309 Set_Delay_Subprogram_Descriptors (E);
3310 Pending_Descriptor.Append (E);
3312 end Delay_Descriptors;
3314 -----------------------
3315 -- Might_Inline_Subp --
3316 -----------------------
3318 function Might_Inline_Subp return Boolean is
3322 if not Inline_Processing_Required then
3326 E := First_Entity (Gen_Unit);
3327 while Present (E) loop
3328 if Is_Subprogram (E)
3329 and then Is_Inlined (E)
3339 end Might_Inline_Subp;
3341 -- Local declarations
3343 Vis_Prims_List : Elist_Id := No_Elist;
3344 -- List of primitives made temporarily visible in the instantiation
3345 -- to match the visibility of the formal type
3347 -- Start of processing for Analyze_Package_Instantiation
3350 Check_SPARK_Restriction ("generic is not allowed", N);
3352 -- Very first thing: apply the special kludge for Text_IO processing
3353 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3355 Text_IO_Kludge (Name (N));
3357 -- Make node global for error reporting
3359 Instantiation_Node := N;
3361 -- Turn off style checking in instances. If the check is enabled on the
3362 -- generic unit, a warning in an instance would just be noise. If not
3363 -- enabled on the generic, then a warning in an instance is just wrong.
3365 Style_Check := False;
3367 -- Case of instantiation of a generic package
3369 if Nkind (N) = N_Package_Instantiation then
3370 Act_Decl_Id := New_Copy (Defining_Entity (N));
3371 Set_Comes_From_Source (Act_Decl_Id, True);
3373 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3375 Make_Defining_Program_Unit_Name (Loc,
3376 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
3377 Defining_Identifier => Act_Decl_Id);
3379 Act_Decl_Name := Act_Decl_Id;
3382 -- Case of instantiation of a formal package
3385 Act_Decl_Id := Defining_Identifier (N);
3386 Act_Decl_Name := Act_Decl_Id;
3389 Generate_Definition (Act_Decl_Id);
3390 Preanalyze_Actuals (N);
3393 Env_Installed := True;
3395 -- Reset renaming map for formal types. The mapping is established
3396 -- when analyzing the generic associations, but some mappings are
3397 -- inherited from formal packages of parent units, and these are
3398 -- constructed when the parents are installed.
3400 Generic_Renamings.Set_Last (0);
3401 Generic_Renamings_HTable.Reset;
3403 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3404 Gen_Unit := Entity (Gen_Id);
3406 -- Verify that it is the name of a generic package
3408 -- A visibility glitch: if the instance is a child unit and the generic
3409 -- is the generic unit of a parent instance (i.e. both the parent and
3410 -- the child units are instances of the same package) the name now
3411 -- denotes the renaming within the parent, not the intended generic
3412 -- unit. See if there is a homonym that is the desired generic. The
3413 -- renaming declaration must be visible inside the instance of the
3414 -- child, but not when analyzing the name in the instantiation itself.
3416 if Ekind (Gen_Unit) = E_Package
3417 and then Present (Renamed_Entity (Gen_Unit))
3418 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3419 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3420 and then Present (Homonym (Gen_Unit))
3422 Gen_Unit := Homonym (Gen_Unit);
3425 if Etype (Gen_Unit) = Any_Type then
3429 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3431 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3433 if From_With_Type (Gen_Unit) then
3435 ("cannot instantiate a limited withed package", Gen_Id);
3438 ("expect name of generic package in instantiation", Gen_Id);
3445 if In_Extended_Main_Source_Unit (N) then
3446 Set_Is_Instantiated (Gen_Unit);
3447 Generate_Reference (Gen_Unit, N);
3449 if Present (Renamed_Object (Gen_Unit)) then
3450 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3451 Generate_Reference (Renamed_Object (Gen_Unit), N);
3455 if Nkind (Gen_Id) = N_Identifier
3456 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3459 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3461 elsif Nkind (Gen_Id) = N_Expanded_Name
3462 and then Is_Child_Unit (Gen_Unit)
3463 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3464 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3467 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3470 Set_Entity (Gen_Id, Gen_Unit);
3472 -- If generic is a renaming, get original generic unit
3474 if Present (Renamed_Object (Gen_Unit))
3475 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3477 Gen_Unit := Renamed_Object (Gen_Unit);
3480 -- Verify that there are no circular instantiations
3482 if In_Open_Scopes (Gen_Unit) then
3483 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3487 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3488 Error_Msg_Node_2 := Current_Scope;
3490 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3491 Circularity_Detected := True;
3496 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3498 -- Initialize renamings map, for error checking, and the list that
3499 -- holds private entities whose views have changed between generic
3500 -- definition and instantiation. If this is the instance created to
3501 -- validate an actual package, the instantiation environment is that
3502 -- of the enclosing instance.
3504 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3506 -- Copy original generic tree, to produce text for instantiation
3510 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3512 Act_Spec := Specification (Act_Tree);
3514 -- If this is the instance created to validate an actual package,
3515 -- only the formals matter, do not examine the package spec itself.
3517 if Is_Actual_Pack then
3518 Set_Visible_Declarations (Act_Spec, New_List);
3519 Set_Private_Declarations (Act_Spec, New_List);
3523 Analyze_Associations
3525 Formals => Generic_Formal_Declarations (Act_Tree),
3526 F_Copy => Generic_Formal_Declarations (Gen_Decl));
3528 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
3530 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3531 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3532 Set_Is_Generic_Instance (Act_Decl_Id);
3534 Set_Generic_Parent (Act_Spec, Gen_Unit);
3536 -- References to the generic in its own declaration or its body are
3537 -- references to the instance. Add a renaming declaration for the
3538 -- generic unit itself. This declaration, as well as the renaming
3539 -- declarations for the generic formals, must remain private to the
3540 -- unit: the formals, because this is the language semantics, and
3541 -- the unit because its use is an artifact of the implementation.
3544 Make_Package_Renaming_Declaration (Loc,
3545 Defining_Unit_Name =>
3546 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3547 Name => New_Reference_To (Act_Decl_Id, Loc));
3549 Append (Unit_Renaming, Renaming_List);
3551 -- The renaming declarations are the first local declarations of
3554 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3556 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3558 Set_Visible_Declarations (Act_Spec, Renaming_List);
3562 Make_Package_Declaration (Loc,
3563 Specification => Act_Spec);
3565 -- Save the instantiation node, for subsequent instantiation of the
3566 -- body, if there is one and we are generating code for the current
3567 -- unit. Mark the unit as having a body, to avoid a premature error
3570 -- We instantiate the body if we are generating code, if we are
3571 -- generating cross-reference information, or if we are building
3572 -- trees for ASIS use.
3575 Enclosing_Body_Present : Boolean := False;
3576 -- If the generic unit is not a compilation unit, then a body may
3577 -- be present in its parent even if none is required. We create a
3578 -- tentative pending instantiation for the body, which will be
3579 -- discarded if none is actually present.
3584 if Scope (Gen_Unit) /= Standard_Standard
3585 and then not Is_Child_Unit (Gen_Unit)
3587 Scop := Scope (Gen_Unit);
3589 while Present (Scop)
3590 and then Scop /= Standard_Standard
3592 if Unit_Requires_Body (Scop) then
3593 Enclosing_Body_Present := True;
3596 elsif In_Open_Scopes (Scop)
3597 and then In_Package_Body (Scop)
3599 Enclosing_Body_Present := True;
3603 exit when Is_Compilation_Unit (Scop);
3604 Scop := Scope (Scop);
3608 -- If front-end inlining is enabled, and this is a unit for which
3609 -- code will be generated, we instantiate the body at once.
3611 -- This is done if the instance is not the main unit, and if the
3612 -- generic is not a child unit of another generic, to avoid scope
3613 -- problems and the reinstallation of parent instances.
3616 and then (not Is_Child_Unit (Gen_Unit)
3617 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3618 and then Might_Inline_Subp
3619 and then not Is_Actual_Pack
3621 if Front_End_Inlining
3622 and then (Is_In_Main_Unit (N)
3623 or else In_Main_Context (Current_Scope))
3624 and then Nkind (Parent (N)) /= N_Compilation_Unit
3628 -- In configurable_run_time mode we force the inlining of
3629 -- predefined subprograms marked Inline_Always, to minimize
3630 -- the use of the run-time library.
3632 elsif Is_Predefined_File_Name
3633 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3634 and then Configurable_Run_Time_Mode
3635 and then Nkind (Parent (N)) /= N_Compilation_Unit
3640 -- If the current scope is itself an instance within a child
3641 -- unit, there will be duplications in the scope stack, and the
3642 -- unstacking mechanism in Inline_Instance_Body will fail.
3643 -- This loses some rare cases of optimization, and might be
3644 -- improved some day, if we can find a proper abstraction for
3645 -- "the complete compilation context" that can be saved and
3648 if Is_Generic_Instance (Current_Scope) then
3650 Curr_Unit : constant Entity_Id :=
3651 Cunit_Entity (Current_Sem_Unit);
3653 if Curr_Unit /= Current_Scope
3654 and then Is_Child_Unit (Curr_Unit)
3656 Inline_Now := False;
3663 (Unit_Requires_Body (Gen_Unit)
3664 or else Enclosing_Body_Present
3665 or else Present (Corresponding_Body (Gen_Decl)))
3666 and then (Is_In_Main_Unit (N)
3667 or else Might_Inline_Subp)
3668 and then not Is_Actual_Pack
3669 and then not Inline_Now
3670 and then not Alfa_Mode
3671 and then (Operating_Mode = Generate_Code
3672 or else (Operating_Mode = Check_Semantics
3673 and then ASIS_Mode));
3675 -- If front_end_inlining is enabled, do not instantiate body if
3676 -- within a generic context.
3678 if (Front_End_Inlining
3679 and then not Expander_Active)
3680 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3682 Needs_Body := False;
3685 -- If the current context is generic, and the package being
3686 -- instantiated is declared within a formal package, there is no
3687 -- body to instantiate until the enclosing generic is instantiated
3688 -- and there is an actual for the formal package. If the formal
3689 -- package has parameters, we build a regular package instance for
3690 -- it, that precedes the original formal package declaration.
3692 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3694 Decl : constant Node_Id :=
3696 (Unit_Declaration_Node (Scope (Gen_Unit)));
3698 if Nkind (Decl) = N_Formal_Package_Declaration
3699 or else (Nkind (Decl) = N_Package_Declaration
3700 and then Is_List_Member (Decl)
3701 and then Present (Next (Decl))
3703 Nkind (Next (Decl)) =
3704 N_Formal_Package_Declaration)
3706 Needs_Body := False;
3712 -- For RCI unit calling stubs, we omit the instance body if the
3713 -- instance is the RCI library unit itself.
3715 -- However there is a special case for nested instances: in this case
3716 -- we do generate the instance body, as it might be required, e.g.
3717 -- because it provides stream attributes for some type used in the
3718 -- profile of a remote subprogram. This is consistent with 12.3(12),
3719 -- which indicates that the instance body occurs at the place of the
3720 -- instantiation, and thus is part of the RCI declaration, which is
3721 -- present on all client partitions (this is E.2.3(18)).
3723 -- Note that AI12-0002 may make it illegal at some point to have
3724 -- stream attributes defined in an RCI unit, in which case this
3725 -- special case will become unnecessary. In the meantime, there
3726 -- is known application code in production that depends on this
3727 -- being possible, so we definitely cannot eliminate the body in
3728 -- the case of nested instances for the time being.
3730 -- When we generate a nested instance body, calling stubs for any
3731 -- relevant subprogram will be be inserted immediately after the
3732 -- subprogram declarations, and will take precedence over the
3733 -- subsequent (original) body. (The stub and original body will be
3734 -- complete homographs, but this is permitted in an instance).
3735 -- (Could we do better and remove the original body???)
3737 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3738 and then Comes_From_Source (N)
3739 and then Nkind (Parent (N)) = N_Compilation_Unit
3741 Needs_Body := False;
3746 -- Here is a defence against a ludicrous number of instantiations
3747 -- caused by a circular set of instantiation attempts.
3749 if Pending_Instantiations.Last > Hostparm.Max_Instantiations then
3750 Error_Msg_N ("too many instantiations", N);
3751 raise Unrecoverable_Error;
3754 -- Indicate that the enclosing scopes contain an instantiation,
3755 -- and that cleanup actions should be delayed until after the
3756 -- instance body is expanded.
3758 Check_Forward_Instantiation (Gen_Decl);
3759 if Nkind (N) = N_Package_Instantiation then
3761 Enclosing_Master : Entity_Id;
3764 -- Loop to search enclosing masters
3766 Enclosing_Master := Current_Scope;
3767 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3768 if Ekind (Enclosing_Master) = E_Package then
3769 if Is_Compilation_Unit (Enclosing_Master) then
3770 if In_Package_Body (Enclosing_Master) then
3772 (Body_Entity (Enclosing_Master));
3781 Enclosing_Master := Scope (Enclosing_Master);
3784 elsif Is_Generic_Unit (Enclosing_Master)
3785 or else Ekind (Enclosing_Master) = E_Void
3787 -- Cleanup actions will eventually be performed on the
3788 -- enclosing subprogram or package instance, if any.
3789 -- Enclosing scope is void in the formal part of a
3790 -- generic subprogram.
3795 if Ekind (Enclosing_Master) = E_Entry
3797 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3799 if not Expander_Active then
3803 Protected_Body_Subprogram (Enclosing_Master);
3807 Set_Delay_Cleanups (Enclosing_Master);
3809 while Ekind (Enclosing_Master) = E_Block loop
3810 Enclosing_Master := Scope (Enclosing_Master);
3813 if Is_Subprogram (Enclosing_Master) then
3814 Delay_Descriptors (Enclosing_Master);
3816 elsif Is_Task_Type (Enclosing_Master) then
3818 TBP : constant Node_Id :=
3819 Get_Task_Body_Procedure
3822 if Present (TBP) then
3823 Delay_Descriptors (TBP);
3824 Set_Delay_Cleanups (TBP);
3831 end loop Scope_Loop;
3834 -- Make entry in table
3836 Pending_Instantiations.Append
3838 Act_Decl => Act_Decl,
3839 Expander_Status => Expander_Active,
3840 Current_Sem_Unit => Current_Sem_Unit,
3841 Scope_Suppress => Scope_Suppress,
3842 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3843 Version => Ada_Version));
3847 Set_Categorization_From_Pragmas (Act_Decl);
3849 if Parent_Installed then
3853 Set_Instance_Spec (N, Act_Decl);
3855 -- If not a compilation unit, insert the package declaration before
3856 -- the original instantiation node.
3858 if Nkind (Parent (N)) /= N_Compilation_Unit then
3859 Mark_Rewrite_Insertion (Act_Decl);
3860 Insert_Before (N, Act_Decl);
3863 -- For an instantiation that is a compilation unit, place
3864 -- declaration on current node so context is complete for analysis
3865 -- (including nested instantiations). If this is the main unit,
3866 -- the declaration eventually replaces the instantiation node.
3867 -- If the instance body is created later, it replaces the
3868 -- instance node, and the declaration is attached to it
3869 -- (see Build_Instance_Compilation_Unit_Nodes).
3872 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3874 -- The entity for the current unit is the newly created one,
3875 -- and all semantic information is attached to it.
3877 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3879 -- If this is the main unit, replace the main entity as well
3881 if Current_Sem_Unit = Main_Unit then
3882 Main_Unit_Entity := Act_Decl_Id;
3886 Set_Unit (Parent (N), Act_Decl);
3887 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3888 Set_Package_Instantiation (Act_Decl_Id, N);
3890 Set_Unit (Parent (N), N);
3891 Set_Body_Required (Parent (N), False);
3893 -- We never need elaboration checks on instantiations, since by
3894 -- definition, the body instantiation is elaborated at the same
3895 -- time as the spec instantiation.
3897 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3898 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3901 Check_Elab_Instantiation (N);
3903 if ABE_Is_Certain (N) and then Needs_Body then
3904 Pending_Instantiations.Decrement_Last;
3907 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3909 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3910 First_Private_Entity (Act_Decl_Id));
3912 -- If the instantiation will receive a body, the unit will be
3913 -- transformed into a package body, and receive its own elaboration
3914 -- entity. Otherwise, the nature of the unit is now a package
3917 if Nkind (Parent (N)) = N_Compilation_Unit
3918 and then not Needs_Body
3920 Rewrite (N, Act_Decl);
3923 if Present (Corresponding_Body (Gen_Decl))
3924 or else Unit_Requires_Body (Gen_Unit)
3926 Set_Has_Completion (Act_Decl_Id);
3929 Check_Formal_Packages (Act_Decl_Id);
3931 Restore_Hidden_Primitives (Vis_Prims_List);
3932 Restore_Private_Views (Act_Decl_Id);
3934 Inherit_Context (Gen_Decl, N);
3936 if Parent_Installed then
3941 Env_Installed := False;
3944 Validate_Categorization_Dependency (N, Act_Decl_Id);
3946 -- There used to be a check here to prevent instantiations in local
3947 -- contexts if the No_Local_Allocators restriction was active. This
3948 -- check was removed by a binding interpretation in AI-95-00130/07,
3949 -- but we retain the code for documentation purposes.
3951 -- if Ekind (Act_Decl_Id) /= E_Void
3952 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3954 -- Check_Restriction (No_Local_Allocators, N);
3958 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3961 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3962 -- be used as defining identifiers for a formal package and for the
3963 -- corresponding expanded package.
3965 if Nkind (N) = N_Formal_Package_Declaration then
3966 Act_Decl_Id := New_Copy (Defining_Entity (N));
3967 Set_Comes_From_Source (Act_Decl_Id, True);
3968 Set_Is_Generic_Instance (Act_Decl_Id, False);
3969 Set_Defining_Identifier (N, Act_Decl_Id);
3972 Style_Check := Save_Style_Check;
3974 -- Check that if N is an instantiation of System.Dim_Float_IO or
3975 -- System.Dim_Integer_IO, the formal type has a dimension system.
3977 if Nkind (N) = N_Package_Instantiation
3978 and then Is_Dim_IO_Package_Instantiation (N)
3981 Assoc : constant Node_Id := First (Generic_Associations (N));
3983 if not Has_Dimension_System
3984 (Etype (Explicit_Generic_Actual_Parameter (Assoc)))
3986 Error_Msg_N ("type with a dimension system expected", Assoc);
3992 if Has_Aspects (N) then
3993 Analyze_Aspect_Specifications (N, Act_Decl_Id);
3997 when Instantiation_Error =>
3998 if Parent_Installed then
4002 if Env_Installed then
4006 Style_Check := Save_Style_Check;
4007 end Analyze_Package_Instantiation;
4009 --------------------------
4010 -- Inline_Instance_Body --
4011 --------------------------
4013 procedure Inline_Instance_Body
4015 Gen_Unit : Entity_Id;
4019 Gen_Comp : constant Entity_Id :=
4020 Cunit_Entity (Get_Source_Unit (Gen_Unit));
4021 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
4022 Curr_Scope : Entity_Id := Empty;
4023 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
4024 Removed : Boolean := False;
4025 Num_Scopes : Int := 0;
4027 Scope_Stack_Depth : constant Int :=
4028 Scope_Stack.Last - Scope_Stack.First + 1;
4030 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
4031 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
4032 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
4033 Num_Inner : Int := 0;
4034 N_Instances : Int := 0;
4038 -- Case of generic unit defined in another unit. We must remove the
4039 -- complete context of the current unit to install that of the generic.
4041 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
4043 -- Add some comments for the following two loops ???
4046 while Present (S) and then S /= Standard_Standard loop
4048 Num_Scopes := Num_Scopes + 1;
4050 Use_Clauses (Num_Scopes) :=
4052 (Scope_Stack.Last - Num_Scopes + 1).
4054 End_Use_Clauses (Use_Clauses (Num_Scopes));
4056 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
4057 or else Scope_Stack.Table
4058 (Scope_Stack.Last - Num_Scopes).Entity
4062 exit when Is_Generic_Instance (S)
4063 and then (In_Package_Body (S)
4064 or else Ekind (S) = E_Procedure
4065 or else Ekind (S) = E_Function);
4069 Vis := Is_Immediately_Visible (Gen_Comp);
4071 -- Find and save all enclosing instances
4076 and then S /= Standard_Standard
4078 if Is_Generic_Instance (S) then
4079 N_Instances := N_Instances + 1;
4080 Instances (N_Instances) := S;
4082 exit when In_Package_Body (S);
4088 -- Remove context of current compilation unit, unless we are within a
4089 -- nested package instantiation, in which case the context has been
4090 -- removed previously.
4092 -- If current scope is the body of a child unit, remove context of
4093 -- spec as well. If an enclosing scope is an instance body, the
4094 -- context has already been removed, but the entities in the body
4095 -- must be made invisible as well.
4100 and then S /= Standard_Standard
4102 if Is_Generic_Instance (S)
4103 and then (In_Package_Body (S)
4104 or else Ekind (S) = E_Procedure
4105 or else Ekind (S) = E_Function)
4107 -- We still have to remove the entities of the enclosing
4108 -- instance from direct visibility.
4113 E := First_Entity (S);
4114 while Present (E) loop
4115 Set_Is_Immediately_Visible (E, False);
4124 or else (Ekind (Curr_Unit) = E_Package_Body
4125 and then S = Spec_Entity (Curr_Unit))
4126 or else (Ekind (Curr_Unit) = E_Subprogram_Body
4129 (Unit_Declaration_Node (Curr_Unit)))
4133 -- Remove entities in current scopes from visibility, so that
4134 -- instance body is compiled in a clean environment.
4136 Save_Scope_Stack (Handle_Use => False);
4138 if Is_Child_Unit (S) then
4140 -- Remove child unit from stack, as well as inner scopes.
4141 -- Removing the context of a child unit removes parent units
4144 while Current_Scope /= S loop
4145 Num_Inner := Num_Inner + 1;
4146 Inner_Scopes (Num_Inner) := Current_Scope;
4151 Remove_Context (Curr_Comp);
4155 Remove_Context (Curr_Comp);
4158 if Ekind (Curr_Unit) = E_Package_Body then
4159 Remove_Context (Library_Unit (Curr_Comp));
4165 pragma Assert (Num_Inner < Num_Scopes);
4167 Push_Scope (Standard_Standard);
4168 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
4169 Instantiate_Package_Body
4172 Act_Decl => Act_Decl,
4173 Expander_Status => Expander_Active,
4174 Current_Sem_Unit => Current_Sem_Unit,
4175 Scope_Suppress => Scope_Suppress,
4176 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4177 Version => Ada_Version)),
4178 Inlined_Body => True);
4184 Set_Is_Immediately_Visible (Gen_Comp, Vis);
4186 -- Reset Generic_Instance flag so that use clauses can be installed
4187 -- in the proper order. (See Use_One_Package for effect of enclosing
4188 -- instances on processing of use clauses).
4190 for J in 1 .. N_Instances loop
4191 Set_Is_Generic_Instance (Instances (J), False);
4195 Install_Context (Curr_Comp);
4197 if Present (Curr_Scope)
4198 and then Is_Child_Unit (Curr_Scope)
4200 Push_Scope (Curr_Scope);
4201 Set_Is_Immediately_Visible (Curr_Scope);
4203 -- Finally, restore inner scopes as well
4205 for J in reverse 1 .. Num_Inner loop
4206 Push_Scope (Inner_Scopes (J));
4210 Restore_Scope_Stack (Handle_Use => False);
4212 if Present (Curr_Scope)
4214 (In_Private_Part (Curr_Scope)
4215 or else In_Package_Body (Curr_Scope))
4217 -- Install private declaration of ancestor units, which are
4218 -- currently available. Restore_Scope_Stack and Install_Context
4219 -- only install the visible part of parents.
4224 Par := Scope (Curr_Scope);
4225 while (Present (Par))
4226 and then Par /= Standard_Standard
4228 Install_Private_Declarations (Par);
4235 -- Restore use clauses. For a child unit, use clauses in the parents
4236 -- are restored when installing the context, so only those in inner
4237 -- scopes (and those local to the child unit itself) need to be
4238 -- installed explicitly.
4240 if Is_Child_Unit (Curr_Unit)
4243 for J in reverse 1 .. Num_Inner + 1 loop
4244 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4246 Install_Use_Clauses (Use_Clauses (J));
4250 for J in reverse 1 .. Num_Scopes loop
4251 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4253 Install_Use_Clauses (Use_Clauses (J));
4257 -- Restore status of instances. If one of them is a body, make
4258 -- its local entities visible again.
4265 for J in 1 .. N_Instances loop
4266 Inst := Instances (J);
4267 Set_Is_Generic_Instance (Inst, True);
4269 if In_Package_Body (Inst)
4270 or else Ekind (S) = E_Procedure
4271 or else Ekind (S) = E_Function
4273 E := First_Entity (Instances (J));
4274 while Present (E) loop
4275 Set_Is_Immediately_Visible (E);
4282 -- If generic unit is in current unit, current context is correct
4285 Instantiate_Package_Body
4288 Act_Decl => Act_Decl,
4289 Expander_Status => Expander_Active,
4290 Current_Sem_Unit => Current_Sem_Unit,
4291 Scope_Suppress => Scope_Suppress,
4292 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4293 Version => Ada_Version)),
4294 Inlined_Body => True);
4296 end Inline_Instance_Body;
4298 -------------------------------------
4299 -- Analyze_Procedure_Instantiation --
4300 -------------------------------------
4302 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4304 Analyze_Subprogram_Instantiation (N, E_Procedure);
4305 end Analyze_Procedure_Instantiation;
4307 -----------------------------------
4308 -- Need_Subprogram_Instance_Body --
4309 -----------------------------------
4311 function Need_Subprogram_Instance_Body
4313 Subp : Entity_Id) return Boolean
4316 if (Is_In_Main_Unit (N)
4317 or else Is_Inlined (Subp)
4318 or else Is_Inlined (Alias (Subp)))
4319 and then (Operating_Mode = Generate_Code
4320 or else (Operating_Mode = Check_Semantics
4321 and then ASIS_Mode))
4322 and then (Full_Expander_Active or else ASIS_Mode)
4323 and then not ABE_Is_Certain (N)
4324 and then not Is_Eliminated (Subp)
4326 Pending_Instantiations.Append
4328 Act_Decl => Unit_Declaration_Node (Subp),
4329 Expander_Status => Expander_Active,
4330 Current_Sem_Unit => Current_Sem_Unit,
4331 Scope_Suppress => Scope_Suppress,
4332 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4333 Version => Ada_Version));
4339 end Need_Subprogram_Instance_Body;
4341 --------------------------------------
4342 -- Analyze_Subprogram_Instantiation --
4343 --------------------------------------
4345 procedure Analyze_Subprogram_Instantiation
4349 Loc : constant Source_Ptr := Sloc (N);
4350 Gen_Id : constant Node_Id := Name (N);
4352 Anon_Id : constant Entity_Id :=
4353 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4354 Chars => New_External_Name
4355 (Chars (Defining_Entity (N)), 'R'));
4357 Act_Decl_Id : Entity_Id;
4362 Env_Installed : Boolean := False;
4363 Gen_Unit : Entity_Id;
4365 Pack_Id : Entity_Id;
4366 Parent_Installed : Boolean := False;
4367 Renaming_List : List_Id;
4369 Save_Style_Check : constant Boolean := Style_Check;
4370 -- Save style check mode for restore on exit
4372 procedure Analyze_Instance_And_Renamings;
4373 -- The instance must be analyzed in a context that includes the mappings
4374 -- of generic parameters into actuals. We create a package declaration
4375 -- for this purpose, and a subprogram with an internal name within the
4376 -- package. The subprogram instance is simply an alias for the internal
4377 -- subprogram, declared in the current scope.
4379 ------------------------------------
4380 -- Analyze_Instance_And_Renamings --
4381 ------------------------------------
4383 procedure Analyze_Instance_And_Renamings is
4384 Def_Ent : constant Entity_Id := Defining_Entity (N);
4385 Pack_Decl : Node_Id;
4388 if Nkind (Parent (N)) = N_Compilation_Unit then
4390 -- For the case of a compilation unit, the container package has
4391 -- the same name as the instantiation, to insure that the binder
4392 -- calls the elaboration procedure with the right name. Copy the
4393 -- entity of the instance, which may have compilation level flags
4394 -- (e.g. Is_Child_Unit) set.
4396 Pack_Id := New_Copy (Def_Ent);
4399 -- Otherwise we use the name of the instantiation concatenated
4400 -- with its source position to ensure uniqueness if there are
4401 -- several instantiations with the same name.
4404 Make_Defining_Identifier (Loc,
4405 Chars => New_External_Name
4406 (Related_Id => Chars (Def_Ent),
4408 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4411 Pack_Decl := Make_Package_Declaration (Loc,
4412 Specification => Make_Package_Specification (Loc,
4413 Defining_Unit_Name => Pack_Id,
4414 Visible_Declarations => Renaming_List,
4415 End_Label => Empty));
4417 Set_Instance_Spec (N, Pack_Decl);
4418 Set_Is_Generic_Instance (Pack_Id);
4419 Set_Debug_Info_Needed (Pack_Id);
4421 -- Case of not a compilation unit
4423 if Nkind (Parent (N)) /= N_Compilation_Unit then
4424 Mark_Rewrite_Insertion (Pack_Decl);
4425 Insert_Before (N, Pack_Decl);
4426 Set_Has_Completion (Pack_Id);
4428 -- Case of an instantiation that is a compilation unit
4430 -- Place declaration on current node so context is complete for
4431 -- analysis (including nested instantiations), and for use in a
4432 -- context_clause (see Analyze_With_Clause).
4435 Set_Unit (Parent (N), Pack_Decl);
4436 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4439 Analyze (Pack_Decl);
4440 Check_Formal_Packages (Pack_Id);
4441 Set_Is_Generic_Instance (Pack_Id, False);
4443 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4446 -- Body of the enclosing package is supplied when instantiating the
4447 -- subprogram body, after semantic analysis is completed.
4449 if Nkind (Parent (N)) = N_Compilation_Unit then
4451 -- Remove package itself from visibility, so it does not
4452 -- conflict with subprogram.
4454 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4456 -- Set name and scope of internal subprogram so that the proper
4457 -- external name will be generated. The proper scope is the scope
4458 -- of the wrapper package. We need to generate debugging info for
4459 -- the internal subprogram, so set flag accordingly.
4461 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4462 Set_Scope (Anon_Id, Scope (Pack_Id));
4464 -- Mark wrapper package as referenced, to avoid spurious warnings
4465 -- if the instantiation appears in various with_ clauses of
4466 -- subunits of the main unit.
4468 Set_Referenced (Pack_Id);
4471 Set_Is_Generic_Instance (Anon_Id);
4472 Set_Debug_Info_Needed (Anon_Id);
4473 Act_Decl_Id := New_Copy (Anon_Id);
4475 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4476 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4477 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4478 Set_Comes_From_Source (Act_Decl_Id, True);
4480 -- The signature may involve types that are not frozen yet, but the
4481 -- subprogram will be frozen at the point the wrapper package is
4482 -- frozen, so it does not need its own freeze node. In fact, if one
4483 -- is created, it might conflict with the freezing actions from the
4486 Set_Has_Delayed_Freeze (Anon_Id, False);
4488 -- If the instance is a child unit, mark the Id accordingly. Mark
4489 -- the anonymous entity as well, which is the real subprogram and
4490 -- which is used when the instance appears in a context clause.
4491 -- Similarly, propagate the Is_Eliminated flag to handle properly
4492 -- nested eliminated subprograms.
4494 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4495 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4496 New_Overloaded_Entity (Act_Decl_Id);
4497 Check_Eliminated (Act_Decl_Id);
4498 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4500 -- In compilation unit case, kill elaboration checks on the
4501 -- instantiation, since they are never needed -- the body is
4502 -- instantiated at the same point as the spec.
4504 if Nkind (Parent (N)) = N_Compilation_Unit then
4505 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4506 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4507 Set_Is_Compilation_Unit (Anon_Id);
4509 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4512 -- The instance is not a freezing point for the new subprogram
4514 Set_Is_Frozen (Act_Decl_Id, False);
4516 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4517 Valid_Operator_Definition (Act_Decl_Id);
4520 Set_Alias (Act_Decl_Id, Anon_Id);
4521 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4522 Set_Has_Completion (Act_Decl_Id);
4523 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4525 if Nkind (Parent (N)) = N_Compilation_Unit then
4526 Set_Body_Required (Parent (N), False);
4528 end Analyze_Instance_And_Renamings;
4532 Vis_Prims_List : Elist_Id := No_Elist;
4533 -- List of primitives made temporarily visible in the instantiation
4534 -- to match the visibility of the formal type
4536 -- Start of processing for Analyze_Subprogram_Instantiation
4539 Check_SPARK_Restriction ("generic is not allowed", N);
4541 -- Very first thing: apply the special kludge for Text_IO processing
4542 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4543 -- Of course such an instantiation is bogus (these are packages, not
4544 -- subprograms), but we get a better error message if we do this.
4546 Text_IO_Kludge (Gen_Id);
4548 -- Make node global for error reporting
4550 Instantiation_Node := N;
4552 -- Turn off style checking in instances. If the check is enabled on the
4553 -- generic unit, a warning in an instance would just be noise. If not
4554 -- enabled on the generic, then a warning in an instance is just wrong.
4556 Style_Check := False;
4558 Preanalyze_Actuals (N);
4561 Env_Installed := True;
4562 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4563 Gen_Unit := Entity (Gen_Id);
4565 Generate_Reference (Gen_Unit, Gen_Id);
4567 if Nkind (Gen_Id) = N_Identifier
4568 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4571 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4574 if Etype (Gen_Unit) = Any_Type then
4579 -- Verify that it is a generic subprogram of the right kind, and that
4580 -- it does not lead to a circular instantiation.
4582 if not Ekind_In (Gen_Unit, E_Generic_Procedure, E_Generic_Function) then
4583 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
4585 elsif In_Open_Scopes (Gen_Unit) then
4586 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4588 elsif K = E_Procedure
4589 and then Ekind (Gen_Unit) /= E_Generic_Procedure
4591 if Ekind (Gen_Unit) = E_Generic_Function then
4593 ("cannot instantiate generic function as procedure", Gen_Id);
4596 ("expect name of generic procedure in instantiation", Gen_Id);
4599 elsif K = E_Function
4600 and then Ekind (Gen_Unit) /= E_Generic_Function
4602 if Ekind (Gen_Unit) = E_Generic_Procedure then
4604 ("cannot instantiate generic procedure as function", Gen_Id);
4607 ("expect name of generic function in instantiation", Gen_Id);
4611 Set_Entity (Gen_Id, Gen_Unit);
4612 Set_Is_Instantiated (Gen_Unit);
4614 if In_Extended_Main_Source_Unit (N) then
4615 Generate_Reference (Gen_Unit, N);
4618 -- If renaming, get original unit
4620 if Present (Renamed_Object (Gen_Unit))
4621 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4623 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4625 Gen_Unit := Renamed_Object (Gen_Unit);
4626 Set_Is_Instantiated (Gen_Unit);
4627 Generate_Reference (Gen_Unit, N);
4630 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4631 Error_Msg_Node_2 := Current_Scope;
4633 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4634 Circularity_Detected := True;
4635 Restore_Hidden_Primitives (Vis_Prims_List);
4639 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4641 -- Initialize renamings map, for error checking
4643 Generic_Renamings.Set_Last (0);
4644 Generic_Renamings_HTable.Reset;
4646 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4648 -- Copy original generic tree, to produce text for instantiation
4652 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4654 -- Inherit overriding indicator from instance node
4656 Act_Spec := Specification (Act_Tree);
4657 Set_Must_Override (Act_Spec, Must_Override (N));
4658 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4661 Analyze_Associations
4663 Formals => Generic_Formal_Declarations (Act_Tree),
4664 F_Copy => Generic_Formal_Declarations (Gen_Decl));
4666 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
4668 -- The subprogram itself cannot contain a nested instance, so the
4669 -- current parent is left empty.
4671 Set_Instance_Env (Gen_Unit, Empty);
4673 -- Build the subprogram declaration, which does not appear in the
4674 -- generic template, and give it a sloc consistent with that of the
4677 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4678 Set_Generic_Parent (Act_Spec, Gen_Unit);
4680 Make_Subprogram_Declaration (Sloc (Act_Spec),
4681 Specification => Act_Spec);
4683 -- The aspects have been copied previously, but they have to be
4684 -- linked explicitly to the new subprogram declaration. Explicit
4685 -- pre/postconditions on the instance are analyzed below, in a
4688 Move_Aspects (Act_Tree, Act_Decl);
4689 Set_Categorization_From_Pragmas (Act_Decl);
4691 if Parent_Installed then
4695 Append (Act_Decl, Renaming_List);
4696 Analyze_Instance_And_Renamings;
4698 -- If the generic is marked Import (Intrinsic), then so is the
4699 -- instance. This indicates that there is no body to instantiate. If
4700 -- generic is marked inline, so it the instance, and the anonymous
4701 -- subprogram it renames. If inlined, or else if inlining is enabled
4702 -- for the compilation, we generate the instance body even if it is
4703 -- not within the main unit.
4705 if Is_Intrinsic_Subprogram (Gen_Unit) then
4706 Set_Is_Intrinsic_Subprogram (Anon_Id);
4707 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4709 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4710 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4714 -- Inherit convention from generic unit. Intrinsic convention, as for
4715 -- an instance of unchecked conversion, is not inherited because an
4716 -- explicit Ada instance has been created.
4718 if Has_Convention_Pragma (Gen_Unit)
4719 and then Convention (Gen_Unit) /= Convention_Intrinsic
4721 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
4722 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
4725 Generate_Definition (Act_Decl_Id);
4726 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
4728 Set_Contract (Act_Decl_Id, Make_Contract (Sloc (Act_Decl_Id)));
4730 -- Inherit all inlining-related flags which apply to the generic in
4731 -- the subprogram and its declaration.
4733 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4734 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4736 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
4737 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
4739 Set_Has_Pragma_Inline_Always
4740 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
4741 Set_Has_Pragma_Inline_Always
4742 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
4744 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4745 Check_Elab_Instantiation (N);
4748 if Is_Dispatching_Operation (Act_Decl_Id)
4749 and then Ada_Version >= Ada_2005
4755 Formal := First_Formal (Act_Decl_Id);
4756 while Present (Formal) loop
4757 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4758 and then Is_Controlling_Formal (Formal)
4759 and then not Can_Never_Be_Null (Formal)
4761 Error_Msg_NE ("access parameter& is controlling,",
4764 ("\corresponding parameter of & must be"
4765 & " explicitly null-excluding", N, Gen_Id);
4768 Next_Formal (Formal);
4773 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4775 Validate_Categorization_Dependency (N, Act_Decl_Id);
4777 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4778 Inherit_Context (Gen_Decl, N);
4780 Restore_Private_Views (Pack_Id, False);
4782 -- If the context requires a full instantiation, mark node for
4783 -- subsequent construction of the body.
4785 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4787 Check_Forward_Instantiation (Gen_Decl);
4789 -- The wrapper package is always delayed, because it does not
4790 -- constitute a freeze point, but to insure that the freeze
4791 -- node is placed properly, it is created directly when
4792 -- instantiating the body (otherwise the freeze node might
4793 -- appear to early for nested instantiations).
4795 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4797 -- For ASIS purposes, indicate that the wrapper package has
4798 -- replaced the instantiation node.
4800 Rewrite (N, Unit (Parent (N)));
4801 Set_Unit (Parent (N), N);
4804 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4806 -- Replace instance node for library-level instantiations of
4807 -- intrinsic subprograms, for ASIS use.
4809 Rewrite (N, Unit (Parent (N)));
4810 Set_Unit (Parent (N), N);
4813 if Parent_Installed then
4817 Restore_Hidden_Primitives (Vis_Prims_List);
4819 Env_Installed := False;
4820 Generic_Renamings.Set_Last (0);
4821 Generic_Renamings_HTable.Reset;
4824 Style_Check := Save_Style_Check;
4827 if Has_Aspects (N) then
4828 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4832 when Instantiation_Error =>
4833 if Parent_Installed then
4837 if Env_Installed then
4841 Style_Check := Save_Style_Check;
4842 end Analyze_Subprogram_Instantiation;
4844 -------------------------
4845 -- Get_Associated_Node --
4846 -------------------------
4848 function Get_Associated_Node (N : Node_Id) return Node_Id is
4852 Assoc := Associated_Node (N);
4854 if Nkind (Assoc) /= Nkind (N) then
4857 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4861 -- If the node is part of an inner generic, it may itself have been
4862 -- remapped into a further generic copy. Associated_Node is otherwise
4863 -- used for the entity of the node, and will be of a different node
4864 -- kind, or else N has been rewritten as a literal or function call.
4866 while Present (Associated_Node (Assoc))
4867 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4869 Assoc := Associated_Node (Assoc);
4872 -- Follow and additional link in case the final node was rewritten.
4873 -- This can only happen with nested generic units.
4875 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4876 and then Present (Associated_Node (Assoc))
4877 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4878 N_Explicit_Dereference,
4883 Assoc := Associated_Node (Assoc);
4888 end Get_Associated_Node;
4890 -------------------------------------------
4891 -- Build_Instance_Compilation_Unit_Nodes --
4892 -------------------------------------------
4894 procedure Build_Instance_Compilation_Unit_Nodes
4899 Decl_Cunit : Node_Id;
4900 Body_Cunit : Node_Id;
4902 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4903 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4906 -- A new compilation unit node is built for the instance declaration
4909 Make_Compilation_Unit (Sloc (N),
4910 Context_Items => Empty_List,
4913 Make_Compilation_Unit_Aux (Sloc (N)));
4915 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4917 -- The new compilation unit is linked to its body, but both share the
4918 -- same file, so we do not set Body_Required on the new unit so as not
4919 -- to create a spurious dependency on a non-existent body in the ali.
4920 -- This simplifies CodePeer unit traversal.
4922 -- We use the original instantiation compilation unit as the resulting
4923 -- compilation unit of the instance, since this is the main unit.
4925 Rewrite (N, Act_Body);
4926 Body_Cunit := Parent (N);
4928 -- The two compilation unit nodes are linked by the Library_Unit field
4930 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4931 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4933 -- Preserve the private nature of the package if needed
4935 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4937 -- If the instance is not the main unit, its context, categorization
4938 -- and elaboration entity are not relevant to the compilation.
4940 if Body_Cunit /= Cunit (Main_Unit) then
4941 Make_Instance_Unit (Body_Cunit, In_Main => False);
4945 -- The context clause items on the instantiation, which are now attached
4946 -- to the body compilation unit (since the body overwrote the original
4947 -- instantiation node), semantically belong on the spec, so copy them
4948 -- there. It's harmless to leave them on the body as well. In fact one
4949 -- could argue that they belong in both places.
4951 Citem := First (Context_Items (Body_Cunit));
4952 while Present (Citem) loop
4953 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4957 -- Propagate categorization flags on packages, so that they appear in
4958 -- the ali file for the spec of the unit.
4960 if Ekind (New_Main) = E_Package then
4961 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4962 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4963 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4964 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4965 Set_Is_Remote_Call_Interface
4966 (Old_Main, Is_Remote_Call_Interface (New_Main));
4969 -- Make entry in Units table, so that binder can generate call to
4970 -- elaboration procedure for body, if any.
4972 Make_Instance_Unit (Body_Cunit, In_Main => True);
4973 Main_Unit_Entity := New_Main;
4974 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4976 -- Build elaboration entity, since the instance may certainly generate
4977 -- elaboration code requiring a flag for protection.
4979 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4980 end Build_Instance_Compilation_Unit_Nodes;
4982 -----------------------------
4983 -- Check_Access_Definition --
4984 -----------------------------
4986 procedure Check_Access_Definition (N : Node_Id) is
4989 (Ada_Version >= Ada_2005
4990 and then Present (Access_Definition (N)));
4992 end Check_Access_Definition;
4994 -----------------------------------
4995 -- Check_Formal_Package_Instance --
4996 -----------------------------------
4998 -- If the formal has specific parameters, they must match those of the
4999 -- actual. Both of them are instances, and the renaming declarations for
5000 -- their formal parameters appear in the same order in both. The analyzed
5001 -- formal has been analyzed in the context of the current instance.
5003 procedure Check_Formal_Package_Instance
5004 (Formal_Pack : Entity_Id;
5005 Actual_Pack : Entity_Id)
5007 E1 : Entity_Id := First_Entity (Actual_Pack);
5008 E2 : Entity_Id := First_Entity (Formal_Pack);
5013 procedure Check_Mismatch (B : Boolean);
5014 -- Common error routine for mismatch between the parameters of the
5015 -- actual instance and those of the formal package.
5017 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
5018 -- The formal may come from a nested formal package, and the actual may
5019 -- have been constant-folded. To determine whether the two denote the
5020 -- same entity we may have to traverse several definitions to recover
5021 -- the ultimate entity that they refer to.
5023 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
5024 -- Similarly, if the formal comes from a nested formal package, the
5025 -- actual may designate the formal through multiple renamings, which
5026 -- have to be followed to determine the original variable in question.
5028 --------------------
5029 -- Check_Mismatch --
5030 --------------------
5032 procedure Check_Mismatch (B : Boolean) is
5033 Kind : constant Node_Kind := Nkind (Parent (E2));
5036 if Kind = N_Formal_Type_Declaration then
5039 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
5040 N_Formal_Package_Declaration)
5041 or else Kind in N_Formal_Subprogram_Declaration
5047 ("actual for & in actual instance does not match formal",
5048 Parent (Actual_Pack), E1);
5052 --------------------------------
5053 -- Same_Instantiated_Constant --
5054 --------------------------------
5056 function Same_Instantiated_Constant
5057 (E1, E2 : Entity_Id) return Boolean
5063 while Present (Ent) loop
5067 elsif Ekind (Ent) /= E_Constant then
5070 elsif Is_Entity_Name (Constant_Value (Ent)) then
5071 if Entity (Constant_Value (Ent)) = E1 then
5074 Ent := Entity (Constant_Value (Ent));
5077 -- The actual may be a constant that has been folded. Recover
5080 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
5081 Ent := Entity (Original_Node (Constant_Value (Ent)));
5088 end Same_Instantiated_Constant;
5090 --------------------------------
5091 -- Same_Instantiated_Variable --
5092 --------------------------------
5094 function Same_Instantiated_Variable
5095 (E1, E2 : Entity_Id) return Boolean
5097 function Original_Entity (E : Entity_Id) return Entity_Id;
5098 -- Follow chain of renamings to the ultimate ancestor
5100 ---------------------
5101 -- Original_Entity --
5102 ---------------------
5104 function Original_Entity (E : Entity_Id) return Entity_Id is
5109 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
5110 and then Present (Renamed_Object (Orig))
5111 and then Is_Entity_Name (Renamed_Object (Orig))
5113 Orig := Entity (Renamed_Object (Orig));
5117 end Original_Entity;
5119 -- Start of processing for Same_Instantiated_Variable
5122 return Ekind (E1) = Ekind (E2)
5123 and then Original_Entity (E1) = Original_Entity (E2);
5124 end Same_Instantiated_Variable;
5126 -- Start of processing for Check_Formal_Package_Instance
5130 and then Present (E2)
5132 exit when Ekind (E1) = E_Package
5133 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
5135 -- If the formal is the renaming of the formal package, this
5136 -- is the end of its formal part, which may occur before the
5137 -- end of the formal part in the actual in the presence of
5138 -- defaulted parameters in the formal package.
5140 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
5141 and then Renamed_Entity (E2) = Scope (E2);
5143 -- The analysis of the actual may generate additional internal
5144 -- entities. If the formal is defaulted, there is no corresponding
5145 -- analysis and the internal entities must be skipped, until we
5146 -- find corresponding entities again.
5148 if Comes_From_Source (E2)
5149 and then not Comes_From_Source (E1)
5150 and then Chars (E1) /= Chars (E2)
5153 and then Chars (E1) /= Chars (E2)
5162 -- If the formal entity comes from a formal declaration, it was
5163 -- defaulted in the formal package, and no check is needed on it.
5165 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
5168 elsif Is_Type (E1) then
5170 -- Subtypes must statically match. E1, E2 are the local entities
5171 -- that are subtypes of the actuals. Itypes generated for other
5172 -- parameters need not be checked, the check will be performed
5173 -- on the parameters themselves.
5175 -- If E2 is a formal type declaration, it is a defaulted parameter
5176 -- and needs no checking.
5178 if not Is_Itype (E1)
5179 and then not Is_Itype (E2)
5183 or else Etype (E1) /= Etype (E2)
5184 or else not Subtypes_Statically_Match (E1, E2));
5187 elsif Ekind (E1) = E_Constant then
5189 -- IN parameters must denote the same static value, or the same
5190 -- constant, or the literal null.
5192 Expr1 := Expression (Parent (E1));
5194 if Ekind (E2) /= E_Constant then
5195 Check_Mismatch (True);
5198 Expr2 := Expression (Parent (E2));
5201 if Is_Static_Expression (Expr1) then
5203 if not Is_Static_Expression (Expr2) then
5204 Check_Mismatch (True);
5206 elsif Is_Discrete_Type (Etype (E1)) then
5208 V1 : constant Uint := Expr_Value (Expr1);
5209 V2 : constant Uint := Expr_Value (Expr2);
5211 Check_Mismatch (V1 /= V2);
5214 elsif Is_Real_Type (Etype (E1)) then
5216 V1 : constant Ureal := Expr_Value_R (Expr1);
5217 V2 : constant Ureal := Expr_Value_R (Expr2);
5219 Check_Mismatch (V1 /= V2);
5222 elsif Is_String_Type (Etype (E1))
5223 and then Nkind (Expr1) = N_String_Literal
5225 if Nkind (Expr2) /= N_String_Literal then
5226 Check_Mismatch (True);
5229 (not String_Equal (Strval (Expr1), Strval (Expr2)));
5233 elsif Is_Entity_Name (Expr1) then
5234 if Is_Entity_Name (Expr2) then
5235 if Entity (Expr1) = Entity (Expr2) then
5239 (not Same_Instantiated_Constant
5240 (Entity (Expr1), Entity (Expr2)));
5243 Check_Mismatch (True);
5246 elsif Is_Entity_Name (Original_Node (Expr1))
5247 and then Is_Entity_Name (Expr2)
5249 Same_Instantiated_Constant
5250 (Entity (Original_Node (Expr1)), Entity (Expr2))
5254 elsif Nkind (Expr1) = N_Null then
5255 Check_Mismatch (Nkind (Expr1) /= N_Null);
5258 Check_Mismatch (True);
5261 elsif Ekind (E1) = E_Variable then
5262 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
5264 elsif Ekind (E1) = E_Package then
5266 (Ekind (E1) /= Ekind (E2)
5267 or else Renamed_Object (E1) /= Renamed_Object (E2));
5269 elsif Is_Overloadable (E1) then
5271 -- Verify that the actual subprograms match. Note that actuals
5272 -- that are attributes are rewritten as subprograms. If the
5273 -- subprogram in the formal package is defaulted, no check is
5274 -- needed. Note that this can only happen in Ada 2005 when the
5275 -- formal package can be partially parameterized.
5277 if Nkind (Unit_Declaration_Node (E1)) =
5278 N_Subprogram_Renaming_Declaration
5279 and then From_Default (Unit_Declaration_Node (E1))
5283 -- If the formal package has an "others" box association that
5284 -- covers this formal, there is no need for a check either.
5286 elsif Nkind (Unit_Declaration_Node (E2)) in
5287 N_Formal_Subprogram_Declaration
5288 and then Box_Present (Unit_Declaration_Node (E2))
5292 -- No check needed if subprogram is a defaulted null procedure
5294 elsif No (Alias (E2))
5295 and then Ekind (E2) = E_Procedure
5297 Null_Present (Specification (Unit_Declaration_Node (E2)))
5301 -- Otherwise the actual in the formal and the actual in the
5302 -- instantiation of the formal must match, up to renamings.
5306 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5310 raise Program_Error;
5317 end Check_Formal_Package_Instance;
5319 ---------------------------
5320 -- Check_Formal_Packages --
5321 ---------------------------
5323 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5325 Formal_P : Entity_Id;
5328 -- Iterate through the declarations in the instance, looking for package
5329 -- renaming declarations that denote instances of formal packages. Stop
5330 -- when we find the renaming of the current package itself. The
5331 -- declaration for a formal package without a box is followed by an
5332 -- internal entity that repeats the instantiation.
5334 E := First_Entity (P_Id);
5335 while Present (E) loop
5336 if Ekind (E) = E_Package then
5337 if Renamed_Object (E) = P_Id then
5340 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5343 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5344 Formal_P := Next_Entity (E);
5345 Check_Formal_Package_Instance (Formal_P, E);
5347 -- After checking, remove the internal validating package. It
5348 -- is only needed for semantic checks, and as it may contain
5349 -- generic formal declarations it should not reach gigi.
5351 Remove (Unit_Declaration_Node (Formal_P));
5357 end Check_Formal_Packages;
5359 ---------------------------------
5360 -- Check_Forward_Instantiation --
5361 ---------------------------------
5363 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5365 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5368 -- The instantiation appears before the generic body if we are in the
5369 -- scope of the unit containing the generic, either in its spec or in
5370 -- the package body, and before the generic body.
5372 if Ekind (Gen_Comp) = E_Package_Body then
5373 Gen_Comp := Spec_Entity (Gen_Comp);
5376 if In_Open_Scopes (Gen_Comp)
5377 and then No (Corresponding_Body (Decl))
5382 and then not Is_Compilation_Unit (S)
5383 and then not Is_Child_Unit (S)
5385 if Ekind (S) = E_Package then
5386 Set_Has_Forward_Instantiation (S);
5392 end Check_Forward_Instantiation;
5394 ---------------------------
5395 -- Check_Generic_Actuals --
5396 ---------------------------
5398 -- The visibility of the actuals may be different between the point of
5399 -- generic instantiation and the instantiation of the body.
5401 procedure Check_Generic_Actuals
5402 (Instance : Entity_Id;
5403 Is_Formal_Box : Boolean)
5408 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5409 -- For a formal that is an array type, the component type is often a
5410 -- previous formal in the same unit. The privacy status of the component
5411 -- type will have been examined earlier in the traversal of the
5412 -- corresponding actuals, and this status should not be modified for the
5413 -- array type itself.
5415 -- To detect this case we have to rescan the list of formals, which
5416 -- is usually short enough to ignore the resulting inefficiency.
5418 -----------------------------
5419 -- Denotes_Previous_Actual --
5420 -----------------------------
5422 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5426 Prev := First_Entity (Instance);
5427 while Present (Prev) loop
5429 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5430 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5431 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5444 end Denotes_Previous_Actual;
5446 -- Start of processing for Check_Generic_Actuals
5449 E := First_Entity (Instance);
5450 while Present (E) loop
5452 and then Nkind (Parent (E)) = N_Subtype_Declaration
5453 and then Scope (Etype (E)) /= Instance
5454 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5456 if Is_Array_Type (E)
5457 and then Denotes_Previous_Actual (Component_Type (E))
5461 Check_Private_View (Subtype_Indication (Parent (E)));
5464 Set_Is_Generic_Actual_Type (E, True);
5465 Set_Is_Hidden (E, False);
5466 Set_Is_Potentially_Use_Visible (E,
5469 -- We constructed the generic actual type as a subtype of the
5470 -- supplied type. This means that it normally would not inherit
5471 -- subtype specific attributes of the actual, which is wrong for
5472 -- the generic case.
5474 Astype := Ancestor_Subtype (E);
5478 -- This can happen when E is an itype that is the full view of
5479 -- a private type completed, e.g. with a constrained array. In
5480 -- that case, use the first subtype, which will carry size
5481 -- information. The base type itself is unconstrained and will
5484 Astype := First_Subtype (E);
5487 Set_Size_Info (E, (Astype));
5488 Set_RM_Size (E, RM_Size (Astype));
5489 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5491 if Is_Discrete_Or_Fixed_Point_Type (E) then
5492 Set_RM_Size (E, RM_Size (Astype));
5494 -- In nested instances, the base type of an access actual
5495 -- may itself be private, and need to be exchanged.
5497 elsif Is_Access_Type (E)
5498 and then Is_Private_Type (Etype (E))
5501 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5504 elsif Ekind (E) = E_Package then
5506 -- If this is the renaming for the current instance, we're done.
5507 -- Otherwise it is a formal package. If the corresponding formal
5508 -- was declared with a box, the (instantiations of the) generic
5509 -- formal part are also visible. Otherwise, ignore the entity
5510 -- created to validate the actuals.
5512 if Renamed_Object (E) = Instance then
5515 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5518 -- The visibility of a formal of an enclosing generic is already
5521 elsif Denotes_Formal_Package (E) then
5524 elsif Present (Associated_Formal_Package (E))
5525 and then not Is_Generic_Formal (E)
5527 if Box_Present (Parent (Associated_Formal_Package (E))) then
5528 Check_Generic_Actuals (Renamed_Object (E), True);
5531 Check_Generic_Actuals (Renamed_Object (E), False);
5534 Set_Is_Hidden (E, False);
5537 -- If this is a subprogram instance (in a wrapper package) the
5538 -- actual is fully visible.
5540 elsif Is_Wrapper_Package (Instance) then
5541 Set_Is_Hidden (E, False);
5543 -- If the formal package is declared with a box, or if the formal
5544 -- parameter is defaulted, it is visible in the body.
5547 or else Is_Visible_Formal (E)
5549 Set_Is_Hidden (E, False);
5552 if Ekind (E) = E_Constant then
5554 -- If the type of the actual is a private type declared in the
5555 -- enclosing scope of the generic unit, the body of the generic
5556 -- sees the full view of the type (because it has to appear in
5557 -- the corresponding package body). If the type is private now,
5558 -- exchange views to restore the proper visiblity in the instance.
5561 Typ : constant Entity_Id := Base_Type (Etype (E));
5562 -- The type of the actual
5567 Parent_Scope : Entity_Id;
5568 -- The enclosing scope of the generic unit
5571 if Is_Wrapper_Package (Instance) then
5575 (Unit_Declaration_Node
5576 (Related_Instance (Instance))));
5580 (Specification (Unit_Declaration_Node (Instance)));
5583 Parent_Scope := Scope (Gen_Id);
5585 -- The exchange is only needed if the generic is defined
5586 -- within a package which is not a common ancestor of the
5587 -- scope of the instance, and is not already in scope.
5589 if Is_Private_Type (Typ)
5590 and then Scope (Typ) = Parent_Scope
5591 and then Scope (Instance) /= Parent_Scope
5592 and then Ekind (Parent_Scope) = E_Package
5593 and then not Is_Child_Unit (Gen_Id)
5597 -- If the type of the entity is a subtype, it may also
5598 -- have to be made visible, together with the base type
5599 -- of its full view, after exchange.
5601 if Is_Private_Type (Etype (E)) then
5602 Switch_View (Etype (E));
5603 Switch_View (Base_Type (Etype (E)));
5611 end Check_Generic_Actuals;
5613 ------------------------------
5614 -- Check_Generic_Child_Unit --
5615 ------------------------------
5617 procedure Check_Generic_Child_Unit
5619 Parent_Installed : in out Boolean)
5621 Loc : constant Source_Ptr := Sloc (Gen_Id);
5622 Gen_Par : Entity_Id := Empty;
5624 Inst_Par : Entity_Id;
5627 function Find_Generic_Child
5629 Id : Node_Id) return Entity_Id;
5630 -- Search generic parent for possible child unit with the given name
5632 function In_Enclosing_Instance return Boolean;
5633 -- Within an instance of the parent, the child unit may be denoted
5634 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5635 -- scopes to locate a possible parent instantiation.
5637 ------------------------
5638 -- Find_Generic_Child --
5639 ------------------------
5641 function Find_Generic_Child
5643 Id : Node_Id) return Entity_Id
5648 -- If entity of name is already set, instance has already been
5649 -- resolved, e.g. in an enclosing instantiation.
5651 if Present (Entity (Id)) then
5652 if Scope (Entity (Id)) = Scop then
5659 E := First_Entity (Scop);
5660 while Present (E) loop
5661 if Chars (E) = Chars (Id)
5662 and then Is_Child_Unit (E)
5664 if Is_Child_Unit (E)
5665 and then not Is_Visible_Child_Unit (E)
5668 ("generic child unit& is not visible", Gen_Id, E);
5680 end Find_Generic_Child;
5682 ---------------------------
5683 -- In_Enclosing_Instance --
5684 ---------------------------
5686 function In_Enclosing_Instance return Boolean is
5687 Enclosing_Instance : Node_Id;
5688 Instance_Decl : Node_Id;
5691 -- We do not inline any call that contains instantiations, except
5692 -- for instantiations of Unchecked_Conversion, so if we are within
5693 -- an inlined body the current instance does not require parents.
5695 if In_Inlined_Body then
5696 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5700 -- Loop to check enclosing scopes
5702 Enclosing_Instance := Current_Scope;
5703 while Present (Enclosing_Instance) loop
5704 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5706 if Ekind (Enclosing_Instance) = E_Package
5707 and then Is_Generic_Instance (Enclosing_Instance)
5709 (Generic_Parent (Specification (Instance_Decl)))
5711 -- Check whether the generic we are looking for is a child of
5714 E := Find_Generic_Child
5715 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5716 exit when Present (E);
5722 Enclosing_Instance := Scope (Enclosing_Instance);
5734 Make_Expanded_Name (Loc,
5736 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5737 Selector_Name => New_Occurrence_Of (E, Loc)));
5739 Set_Entity (Gen_Id, E);
5740 Set_Etype (Gen_Id, Etype (E));
5741 Parent_Installed := False; -- Already in scope.
5744 end In_Enclosing_Instance;
5746 -- Start of processing for Check_Generic_Child_Unit
5749 -- If the name of the generic is given by a selected component, it may
5750 -- be the name of a generic child unit, and the prefix is the name of an
5751 -- instance of the parent, in which case the child unit must be visible.
5752 -- If this instance is not in scope, it must be placed there and removed
5753 -- after instantiation, because what is being instantiated is not the
5754 -- original child, but the corresponding child present in the instance
5757 -- If the child is instantiated within the parent, it can be given by
5758 -- a simple name. In this case the instance is already in scope, but
5759 -- the child generic must be recovered from the generic parent as well.
5761 if Nkind (Gen_Id) = N_Selected_Component then
5762 S := Selector_Name (Gen_Id);
5763 Analyze (Prefix (Gen_Id));
5764 Inst_Par := Entity (Prefix (Gen_Id));
5766 if Ekind (Inst_Par) = E_Package
5767 and then Present (Renamed_Object (Inst_Par))
5769 Inst_Par := Renamed_Object (Inst_Par);
5772 if Ekind (Inst_Par) = E_Package then
5773 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5774 Gen_Par := Generic_Parent (Parent (Inst_Par));
5776 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5778 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5780 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5783 elsif Ekind (Inst_Par) = E_Generic_Package
5784 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5786 -- A formal package may be a real child package, and not the
5787 -- implicit instance within a parent. In this case the child is
5788 -- not visible and has to be retrieved explicitly as well.
5790 Gen_Par := Inst_Par;
5793 if Present (Gen_Par) then
5795 -- The prefix denotes an instantiation. The entity itself may be a
5796 -- nested generic, or a child unit.
5798 E := Find_Generic_Child (Gen_Par, S);
5801 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5802 Set_Entity (Gen_Id, E);
5803 Set_Etype (Gen_Id, Etype (E));
5805 Set_Etype (S, Etype (E));
5807 -- Indicate that this is a reference to the parent
5809 if In_Extended_Main_Source_Unit (Gen_Id) then
5810 Set_Is_Instantiated (Inst_Par);
5813 -- A common mistake is to replicate the naming scheme of a
5814 -- hierarchy by instantiating a generic child directly, rather
5815 -- than the implicit child in a parent instance:
5817 -- generic .. package Gpar is ..
5818 -- generic .. package Gpar.Child is ..
5819 -- package Par is new Gpar ();
5822 -- package Par.Child is new Gpar.Child ();
5823 -- rather than Par.Child
5825 -- In this case the instantiation is within Par, which is an
5826 -- instance, but Gpar does not denote Par because we are not IN
5827 -- the instance of Gpar, so this is illegal. The test below
5828 -- recognizes this particular case.
5830 if Is_Child_Unit (E)
5831 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5832 and then (not In_Instance
5833 or else Nkind (Parent (Parent (Gen_Id))) =
5837 ("prefix of generic child unit must be instance of parent",
5841 if not In_Open_Scopes (Inst_Par)
5842 and then Nkind (Parent (Gen_Id)) not in
5843 N_Generic_Renaming_Declaration
5845 Install_Parent (Inst_Par);
5846 Parent_Installed := True;
5848 elsif In_Open_Scopes (Inst_Par) then
5850 -- If the parent is already installed, install the actuals
5851 -- for its formal packages. This is necessary when the
5852 -- child instance is a child of the parent instance:
5853 -- in this case, the parent is placed on the scope stack
5854 -- but the formal packages are not made visible.
5856 Install_Formal_Packages (Inst_Par);
5860 -- If the generic parent does not contain an entity that
5861 -- corresponds to the selector, the instance doesn't either.
5862 -- Analyzing the node will yield the appropriate error message.
5863 -- If the entity is not a child unit, then it is an inner
5864 -- generic in the parent.
5872 if Is_Child_Unit (Entity (Gen_Id))
5874 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5875 and then not In_Open_Scopes (Inst_Par)
5877 Install_Parent (Inst_Par);
5878 Parent_Installed := True;
5880 -- The generic unit may be the renaming of the implicit child
5881 -- present in an instance. In that case the parent instance is
5882 -- obtained from the name of the renamed entity.
5884 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
5885 and then Present (Renamed_Entity (Entity (Gen_Id)))
5886 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
5889 Renamed_Package : constant Node_Id :=
5890 Name (Parent (Entity (Gen_Id)));
5892 if Nkind (Renamed_Package) = N_Expanded_Name then
5893 Inst_Par := Entity (Prefix (Renamed_Package));
5894 Install_Parent (Inst_Par);
5895 Parent_Installed := True;
5901 elsif Nkind (Gen_Id) = N_Expanded_Name then
5903 -- Entity already present, analyze prefix, whose meaning may be
5904 -- an instance in the current context. If it is an instance of
5905 -- a relative within another, the proper parent may still have
5906 -- to be installed, if they are not of the same generation.
5908 Analyze (Prefix (Gen_Id));
5910 -- In the unlikely case that a local declaration hides the name
5911 -- of the parent package, locate it on the homonym chain. If the
5912 -- context is an instance of the parent, the renaming entity is
5915 Inst_Par := Entity (Prefix (Gen_Id));
5916 while Present (Inst_Par)
5917 and then not Is_Package_Or_Generic_Package (Inst_Par)
5919 Inst_Par := Homonym (Inst_Par);
5922 pragma Assert (Present (Inst_Par));
5923 Set_Entity (Prefix (Gen_Id), Inst_Par);
5925 if In_Enclosing_Instance then
5928 elsif Present (Entity (Gen_Id))
5929 and then Is_Child_Unit (Entity (Gen_Id))
5930 and then not In_Open_Scopes (Inst_Par)
5932 Install_Parent (Inst_Par);
5933 Parent_Installed := True;
5936 elsif In_Enclosing_Instance then
5938 -- The child unit is found in some enclosing scope
5945 -- If this is the renaming of the implicit child in a parent
5946 -- instance, recover the parent name and install it.
5948 if Is_Entity_Name (Gen_Id) then
5949 E := Entity (Gen_Id);
5951 if Is_Generic_Unit (E)
5952 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5953 and then Is_Child_Unit (Renamed_Object (E))
5954 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5955 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5958 New_Copy_Tree (Name (Parent (E))));
5959 Inst_Par := Entity (Prefix (Gen_Id));
5961 if not In_Open_Scopes (Inst_Par) then
5962 Install_Parent (Inst_Par);
5963 Parent_Installed := True;
5966 -- If it is a child unit of a non-generic parent, it may be
5967 -- use-visible and given by a direct name. Install parent as
5970 elsif Is_Generic_Unit (E)
5971 and then Is_Child_Unit (E)
5973 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5974 and then not Is_Generic_Unit (Scope (E))
5976 if not In_Open_Scopes (Scope (E)) then
5977 Install_Parent (Scope (E));
5978 Parent_Installed := True;
5983 end Check_Generic_Child_Unit;
5985 -----------------------------
5986 -- Check_Hidden_Child_Unit --
5987 -----------------------------
5989 procedure Check_Hidden_Child_Unit
5991 Gen_Unit : Entity_Id;
5992 Act_Decl_Id : Entity_Id)
5994 Gen_Id : constant Node_Id := Name (N);
5997 if Is_Child_Unit (Gen_Unit)
5998 and then Is_Child_Unit (Act_Decl_Id)
5999 and then Nkind (Gen_Id) = N_Expanded_Name
6000 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
6001 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
6003 Error_Msg_Node_2 := Scope (Act_Decl_Id);
6005 ("generic unit & is implicitly declared in &",
6006 Defining_Unit_Name (N), Gen_Unit);
6007 Error_Msg_N ("\instance must have different name",
6008 Defining_Unit_Name (N));
6010 end Check_Hidden_Child_Unit;
6012 ------------------------
6013 -- Check_Private_View --
6014 ------------------------
6016 procedure Check_Private_View (N : Node_Id) is
6017 T : constant Entity_Id := Etype (N);
6021 -- Exchange views if the type was not private in the generic but is
6022 -- private at the point of instantiation. Do not exchange views if
6023 -- the scope of the type is in scope. This can happen if both generic
6024 -- and instance are sibling units, or if type is defined in a parent.
6025 -- In this case the visibility of the type will be correct for all
6029 BT := Base_Type (T);
6031 if Is_Private_Type (T)
6032 and then not Has_Private_View (N)
6033 and then Present (Full_View (T))
6034 and then not In_Open_Scopes (Scope (T))
6036 -- In the generic, the full type was visible. Save the private
6037 -- entity, for subsequent exchange.
6041 elsif Has_Private_View (N)
6042 and then not Is_Private_Type (T)
6043 and then not Has_Been_Exchanged (T)
6044 and then Etype (Get_Associated_Node (N)) /= T
6046 -- Only the private declaration was visible in the generic. If
6047 -- the type appears in a subtype declaration, the subtype in the
6048 -- instance must have a view compatible with that of its parent,
6049 -- which must be exchanged (see corresponding code in Restore_
6050 -- Private_Views). Otherwise, if the type is defined in a parent
6051 -- unit, leave full visibility within instance, which is safe.
6053 if In_Open_Scopes (Scope (Base_Type (T)))
6054 and then not Is_Private_Type (Base_Type (T))
6055 and then Comes_From_Source (Base_Type (T))
6059 elsif Nkind (Parent (N)) = N_Subtype_Declaration
6060 or else not In_Private_Part (Scope (Base_Type (T)))
6062 Prepend_Elmt (T, Exchanged_Views);
6063 Exchange_Declarations (Etype (Get_Associated_Node (N)));
6066 -- For composite types with inconsistent representation exchange
6067 -- component types accordingly.
6069 elsif Is_Access_Type (T)
6070 and then Is_Private_Type (Designated_Type (T))
6071 and then not Has_Private_View (N)
6072 and then Present (Full_View (Designated_Type (T)))
6074 Switch_View (Designated_Type (T));
6076 elsif Is_Array_Type (T) then
6077 if Is_Private_Type (Component_Type (T))
6078 and then not Has_Private_View (N)
6079 and then Present (Full_View (Component_Type (T)))
6081 Switch_View (Component_Type (T));
6084 -- The normal exchange mechanism relies on the setting of a
6085 -- flag on the reference in the generic. However, an additional
6086 -- mechanism is needed for types that are not explicitly mentioned
6087 -- in the generic, but may be needed in expanded code in the
6088 -- instance. This includes component types of arrays and
6089 -- designated types of access types. This processing must also
6090 -- include the index types of arrays which we take care of here.
6097 Indx := First_Index (T);
6098 Typ := Base_Type (Etype (Indx));
6099 while Present (Indx) loop
6100 if Is_Private_Type (Typ)
6101 and then Present (Full_View (Typ))
6110 elsif Is_Private_Type (T)
6111 and then Present (Full_View (T))
6112 and then Is_Array_Type (Full_View (T))
6113 and then Is_Private_Type (Component_Type (Full_View (T)))
6117 -- Finally, a non-private subtype may have a private base type, which
6118 -- must be exchanged for consistency. This can happen when a package
6119 -- body is instantiated, when the scope stack is empty but in fact
6120 -- the subtype and the base type are declared in an enclosing scope.
6122 -- Note that in this case we introduce an inconsistency in the view
6123 -- set, because we switch the base type BT, but there could be some
6124 -- private dependent subtypes of BT which remain unswitched. Such
6125 -- subtypes might need to be switched at a later point (see specific
6126 -- provision for that case in Switch_View).
6128 elsif not Is_Private_Type (T)
6129 and then not Has_Private_View (N)
6130 and then Is_Private_Type (BT)
6131 and then Present (Full_View (BT))
6132 and then not Is_Generic_Type (BT)
6133 and then not In_Open_Scopes (BT)
6135 Prepend_Elmt (Full_View (BT), Exchanged_Views);
6136 Exchange_Declarations (BT);
6139 end Check_Private_View;
6141 -----------------------------
6142 -- Check_Hidden_Primitives --
6143 -----------------------------
6145 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is
6148 Result : Elist_Id := No_Elist;
6151 if No (Assoc_List) then
6155 -- Traverse the list of associations between formals and actuals
6156 -- searching for renamings of tagged types
6158 Actual := First (Assoc_List);
6159 while Present (Actual) loop
6160 if Nkind (Actual) = N_Subtype_Declaration then
6161 Gen_T := Generic_Parent_Type (Actual);
6164 and then Is_Tagged_Type (Gen_T)
6166 -- Traverse the list of primitives of the actual types
6167 -- searching for hidden primitives that are visible in the
6168 -- corresponding generic formal; leave them visible and
6169 -- append them to Result to restore their decoration later.
6171 Install_Hidden_Primitives
6172 (Prims_List => Result,
6174 Act_T => Entity (Subtype_Indication (Actual)));
6182 end Check_Hidden_Primitives;
6184 --------------------------
6185 -- Contains_Instance_Of --
6186 --------------------------
6188 function Contains_Instance_Of
6191 N : Node_Id) return Boolean
6199 -- Verify that there are no circular instantiations. We check whether
6200 -- the unit contains an instance of the current scope or some enclosing
6201 -- scope (in case one of the instances appears in a subunit). Longer
6202 -- circularities involving subunits might seem too pathological to
6203 -- consider, but they were not too pathological for the authors of
6204 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6205 -- enclosing generic scopes as containing an instance.
6208 -- Within a generic subprogram body, the scope is not generic, to
6209 -- allow for recursive subprograms. Use the declaration to determine
6210 -- whether this is a generic unit.
6212 if Ekind (Scop) = E_Generic_Package
6213 or else (Is_Subprogram (Scop)
6214 and then Nkind (Unit_Declaration_Node (Scop)) =
6215 N_Generic_Subprogram_Declaration)
6217 Elmt := First_Elmt (Inner_Instances (Inner));
6219 while Present (Elmt) loop
6220 if Node (Elmt) = Scop then
6221 Error_Msg_Node_2 := Inner;
6223 ("circular Instantiation: & instantiated within &!",
6227 elsif Node (Elmt) = Inner then
6230 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
6231 Error_Msg_Node_2 := Inner;
6233 ("circular Instantiation: & instantiated within &!",
6241 -- Indicate that Inner is being instantiated within Scop
6243 Append_Elmt (Inner, Inner_Instances (Scop));
6246 if Scop = Standard_Standard then
6249 Scop := Scope (Scop);
6254 end Contains_Instance_Of;
6256 -----------------------
6257 -- Copy_Generic_Node --
6258 -----------------------
6260 function Copy_Generic_Node
6262 Parent_Id : Node_Id;
6263 Instantiating : Boolean) return Node_Id
6268 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
6269 -- Check the given value of one of the Fields referenced by the
6270 -- current node to determine whether to copy it recursively. The
6271 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
6272 -- value (Sloc, Uint, Char) in which case it need not be copied.
6274 procedure Copy_Descendants;
6275 -- Common utility for various nodes
6277 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
6278 -- Make copy of element list
6280 function Copy_Generic_List
6282 Parent_Id : Node_Id) return List_Id;
6283 -- Apply Copy_Node recursively to the members of a node list
6285 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
6286 -- True if an identifier is part of the defining program unit name
6287 -- of a child unit. The entity of such an identifier must be kept
6288 -- (for ASIS use) even though as the name of an enclosing generic
6289 -- it would otherwise not be preserved in the generic tree.
6291 ----------------------
6292 -- Copy_Descendants --
6293 ----------------------
6295 procedure Copy_Descendants is
6297 use Atree.Unchecked_Access;
6298 -- This code section is part of the implementation of an untyped
6299 -- tree traversal, so it needs direct access to node fields.
6302 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6303 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6304 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6305 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
6306 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6307 end Copy_Descendants;
6309 -----------------------------
6310 -- Copy_Generic_Descendant --
6311 -----------------------------
6313 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
6315 if D = Union_Id (Empty) then
6318 elsif D in Node_Range then
6320 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
6322 elsif D in List_Range then
6323 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
6325 elsif D in Elist_Range then
6326 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
6328 -- Nothing else is copyable (e.g. Uint values), return as is
6333 end Copy_Generic_Descendant;
6335 ------------------------
6336 -- Copy_Generic_Elist --
6337 ------------------------
6339 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
6346 M := First_Elmt (E);
6347 while Present (M) loop
6349 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6358 end Copy_Generic_Elist;
6360 -----------------------
6361 -- Copy_Generic_List --
6362 -----------------------
6364 function Copy_Generic_List
6366 Parent_Id : Node_Id) return List_Id
6374 Set_Parent (New_L, Parent_Id);
6377 while Present (N) loop
6378 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6387 end Copy_Generic_List;
6389 ---------------------------
6390 -- In_Defining_Unit_Name --
6391 ---------------------------
6393 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6395 return Present (Parent (Nam))
6396 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6398 (Nkind (Parent (Nam)) = N_Expanded_Name
6399 and then In_Defining_Unit_Name (Parent (Nam))));
6400 end In_Defining_Unit_Name;
6402 -- Start of processing for Copy_Generic_Node
6409 New_N := New_Copy (N);
6411 -- Copy aspects if present
6413 if Has_Aspects (N) then
6414 Set_Has_Aspects (New_N, False);
6415 Set_Aspect_Specifications
6416 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6419 if Instantiating then
6420 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6423 if not Is_List_Member (N) then
6424 Set_Parent (New_N, Parent_Id);
6427 -- If defining identifier, then all fields have been copied already
6429 if Nkind (New_N) in N_Entity then
6432 -- Special casing for identifiers and other entity names and operators
6434 elsif Nkind_In (New_N, N_Identifier,
6435 N_Character_Literal,
6438 or else Nkind (New_N) in N_Op
6440 if not Instantiating then
6442 -- Link both nodes in order to assign subsequently the entity of
6443 -- the copy to the original node, in case this is a global
6446 Set_Associated_Node (N, New_N);
6448 -- If we are within an instantiation, this is a nested generic
6449 -- that has already been analyzed at the point of definition. We
6450 -- must preserve references that were global to the enclosing
6451 -- parent at that point. Other occurrences, whether global or
6452 -- local to the current generic, must be resolved anew, so we
6453 -- reset the entity in the generic copy. A global reference has a
6454 -- smaller depth than the parent, or else the same depth in case
6455 -- both are distinct compilation units.
6456 -- A child unit is implicitly declared within the enclosing parent
6457 -- but is in fact global to it, and must be preserved.
6459 -- It is also possible for Current_Instantiated_Parent to be
6460 -- defined, and for this not to be a nested generic, namely if the
6461 -- unit is loaded through Rtsfind. In that case, the entity of
6462 -- New_N is only a link to the associated node, and not a defining
6465 -- The entities for parent units in the defining_program_unit of a
6466 -- generic child unit are established when the context of the unit
6467 -- is first analyzed, before the generic copy is made. They are
6468 -- preserved in the copy for use in ASIS queries.
6470 Ent := Entity (New_N);
6472 if No (Current_Instantiated_Parent.Gen_Id) then
6474 or else Nkind (Ent) /= N_Defining_Identifier
6475 or else not In_Defining_Unit_Name (N)
6477 Set_Associated_Node (New_N, Empty);
6482 not Nkind_In (Ent, N_Defining_Identifier,
6483 N_Defining_Character_Literal,
6484 N_Defining_Operator_Symbol)
6485 or else No (Scope (Ent))
6487 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6488 and then not Is_Child_Unit (Ent))
6490 (Scope_Depth (Scope (Ent)) >
6491 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6493 Get_Source_Unit (Ent) =
6494 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6496 Set_Associated_Node (New_N, Empty);
6499 -- Case of instantiating identifier or some other name or operator
6502 -- If the associated node is still defined, the entity in it is
6503 -- global, and must be copied to the instance. If this copy is
6504 -- being made for a body to inline, it is applied to an
6505 -- instantiated tree, and the entity is already present and must
6506 -- be also preserved.
6509 Assoc : constant Node_Id := Get_Associated_Node (N);
6512 if Present (Assoc) then
6513 if Nkind (Assoc) = Nkind (N) then
6514 Set_Entity (New_N, Entity (Assoc));
6515 Check_Private_View (N);
6517 elsif Nkind (Assoc) = N_Function_Call then
6518 Set_Entity (New_N, Entity (Name (Assoc)));
6520 elsif Nkind_In (Assoc, N_Defining_Identifier,
6521 N_Defining_Character_Literal,
6522 N_Defining_Operator_Symbol)
6523 and then Expander_Active
6525 -- Inlining case: we are copying a tree that contains
6526 -- global entities, which are preserved in the copy to be
6527 -- used for subsequent inlining.
6532 Set_Entity (New_N, Empty);
6538 -- For expanded name, we must copy the Prefix and Selector_Name
6540 if Nkind (N) = N_Expanded_Name then
6542 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6544 Set_Selector_Name (New_N,
6545 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6547 -- For operators, we must copy the right operand
6549 elsif Nkind (N) in N_Op then
6550 Set_Right_Opnd (New_N,
6551 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6553 -- And for binary operators, the left operand as well
6555 if Nkind (N) in N_Binary_Op then
6556 Set_Left_Opnd (New_N,
6557 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6561 -- Special casing for stubs
6563 elsif Nkind (N) in N_Body_Stub then
6565 -- In any case, we must copy the specification or defining
6566 -- identifier as appropriate.
6568 if Nkind (N) = N_Subprogram_Body_Stub then
6569 Set_Specification (New_N,
6570 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6573 Set_Defining_Identifier (New_N,
6575 (Defining_Identifier (N), New_N, Instantiating));
6578 -- If we are not instantiating, then this is where we load and
6579 -- analyze subunits, i.e. at the point where the stub occurs. A
6580 -- more permissive system might defer this analysis to the point
6581 -- of instantiation, but this seems to complicated for now.
6583 if not Instantiating then
6585 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6587 Unum : Unit_Number_Type;
6591 -- Make sure that, if it is a subunit of the main unit that is
6592 -- preprocessed and if -gnateG is specified, the preprocessed
6593 -- file will be written.
6595 Lib.Analysing_Subunit_Of_Main :=
6596 Lib.In_Extended_Main_Source_Unit (N);
6599 (Load_Name => Subunit_Name,
6603 Lib.Analysing_Subunit_Of_Main := False;
6605 -- If the proper body is not found, a warning message will be
6606 -- emitted when analyzing the stub, or later at the point
6607 -- of instantiation. Here we just leave the stub as is.
6609 if Unum = No_Unit then
6610 Subunits_Missing := True;
6611 goto Subunit_Not_Found;
6614 Subunit := Cunit (Unum);
6616 if Nkind (Unit (Subunit)) /= N_Subunit then
6618 ("found child unit instead of expected SEPARATE subunit",
6620 Error_Msg_Sloc := Sloc (N);
6621 Error_Msg_N ("\to complete stub #", Subunit);
6622 goto Subunit_Not_Found;
6625 -- We must create a generic copy of the subunit, in order to
6626 -- perform semantic analysis on it, and we must replace the
6627 -- stub in the original generic unit with the subunit, in order
6628 -- to preserve non-local references within.
6630 -- Only the proper body needs to be copied. Library_Unit and
6631 -- context clause are simply inherited by the generic copy.
6632 -- Note that the copy (which may be recursive if there are
6633 -- nested subunits) must be done first, before attaching it to
6634 -- the enclosing generic.
6638 (Proper_Body (Unit (Subunit)),
6639 Empty, Instantiating => False);
6641 -- Now place the original proper body in the original generic
6642 -- unit. This is a body, not a compilation unit.
6644 Rewrite (N, Proper_Body (Unit (Subunit)));
6645 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6646 Set_Was_Originally_Stub (N);
6648 -- Finally replace the body of the subunit with its copy, and
6649 -- make this new subunit into the library unit of the generic
6650 -- copy, which does not have stubs any longer.
6652 Set_Proper_Body (Unit (Subunit), New_Body);
6653 Set_Library_Unit (New_N, Subunit);
6654 Inherit_Context (Unit (Subunit), N);
6657 -- If we are instantiating, this must be an error case, since
6658 -- otherwise we would have replaced the stub node by the proper body
6659 -- that corresponds. So just ignore it in the copy (i.e. we have
6660 -- copied it, and that is good enough).
6666 <<Subunit_Not_Found>> null;
6668 -- If the node is a compilation unit, it is the subunit of a stub, which
6669 -- has been loaded already (see code below). In this case, the library
6670 -- unit field of N points to the parent unit (which is a compilation
6671 -- unit) and need not (and cannot!) be copied.
6673 -- When the proper body of the stub is analyzed, the library_unit link
6674 -- is used to establish the proper context (see sem_ch10).
6676 -- The other fields of a compilation unit are copied as usual
6678 elsif Nkind (N) = N_Compilation_Unit then
6680 -- This code can only be executed when not instantiating, because in
6681 -- the copy made for an instantiation, the compilation unit node has
6682 -- disappeared at the point that a stub is replaced by its proper
6685 pragma Assert (not Instantiating);
6687 Set_Context_Items (New_N,
6688 Copy_Generic_List (Context_Items (N), New_N));
6691 Copy_Generic_Node (Unit (N), New_N, False));
6693 Set_First_Inlined_Subprogram (New_N,
6695 (First_Inlined_Subprogram (N), New_N, False));
6697 Set_Aux_Decls_Node (New_N,
6698 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6700 -- For an assignment node, the assignment is known to be semantically
6701 -- legal if we are instantiating the template. This avoids incorrect
6702 -- diagnostics in generated code.
6704 elsif Nkind (N) = N_Assignment_Statement then
6706 -- Copy name and expression fields in usual manner
6709 Copy_Generic_Node (Name (N), New_N, Instantiating));
6711 Set_Expression (New_N,
6712 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6714 if Instantiating then
6715 Set_Assignment_OK (Name (New_N), True);
6718 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6719 if not Instantiating then
6720 Set_Associated_Node (N, New_N);
6723 if Present (Get_Associated_Node (N))
6724 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6726 -- In the generic the aggregate has some composite type. If at
6727 -- the point of instantiation the type has a private view,
6728 -- install the full view (and that of its ancestors, if any).
6731 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6736 and then Is_Private_Type (T)
6742 and then Is_Tagged_Type (T)
6743 and then Is_Derived_Type (T)
6745 Rt := Root_Type (T);
6750 if Is_Private_Type (T) then
6761 -- Do not copy the associated node, which points to the generic copy
6762 -- of the aggregate.
6765 use Atree.Unchecked_Access;
6766 -- This code section is part of the implementation of an untyped
6767 -- tree traversal, so it needs direct access to node fields.
6770 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6771 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6772 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6773 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6776 -- Allocators do not have an identifier denoting the access type, so we
6777 -- must locate it through the expression to check whether the views are
6780 elsif Nkind (N) = N_Allocator
6781 and then Nkind (Expression (N)) = N_Qualified_Expression
6782 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6783 and then Instantiating
6786 T : constant Node_Id :=
6787 Get_Associated_Node (Subtype_Mark (Expression (N)));
6793 -- Retrieve the allocator node in the generic copy
6795 Acc_T := Etype (Parent (Parent (T)));
6797 and then Is_Private_Type (Acc_T)
6799 Switch_View (Acc_T);
6806 -- For a proper body, we must catch the case of a proper body that
6807 -- replaces a stub. This represents the point at which a separate
6808 -- compilation unit, and hence template file, may be referenced, so we
6809 -- must make a new source instantiation entry for the template of the
6810 -- subunit, and ensure that all nodes in the subunit are adjusted using
6811 -- this new source instantiation entry.
6813 elsif Nkind (N) in N_Proper_Body then
6815 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6818 if Instantiating and then Was_Originally_Stub (N) then
6819 Create_Instantiation_Source
6820 (Instantiation_Node,
6821 Defining_Entity (N),
6826 -- Now copy the fields of the proper body, using the new
6827 -- adjustment factor if one was needed as per test above.
6831 -- Restore the original adjustment factor in case changed
6833 S_Adjustment := Save_Adjustment;
6836 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6837 -- generic unit, not to the instantiating unit.
6839 elsif Nkind (N) = N_Pragma and then Instantiating then
6841 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6843 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6844 New_N := Make_Null_Statement (Sloc (N));
6851 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
6853 -- No descendant fields need traversing
6857 elsif Nkind (N) = N_String_Literal
6858 and then Present (Etype (N))
6859 and then Instantiating
6861 -- If the string is declared in an outer scope, the string_literal
6862 -- subtype created for it may have the wrong scope. We force the
6863 -- reanalysis of the constant to generate a new itype in the proper
6866 Set_Etype (New_N, Empty);
6867 Set_Analyzed (New_N, False);
6869 -- For the remaining nodes, copy their descendants recursively
6874 if Instantiating and then Nkind (N) = N_Subprogram_Body then
6875 Set_Generic_Parent (Specification (New_N), N);
6877 -- Should preserve Corresponding_Spec??? (12.3(14))
6882 end Copy_Generic_Node;
6884 ----------------------------
6885 -- Denotes_Formal_Package --
6886 ----------------------------
6888 function Denotes_Formal_Package
6890 On_Exit : Boolean := False;
6891 Instance : Entity_Id := Empty) return Boolean
6894 Scop : constant Entity_Id := Scope (Pack);
6897 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6898 -- The package in question may be an actual for a previous formal
6899 -- package P of the current instance, so examine its actuals as well.
6900 -- This must be recursive over other formal packages.
6902 ----------------------------------
6903 -- Is_Actual_Of_Previous_Formal --
6904 ----------------------------------
6906 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6910 E1 := First_Entity (P);
6911 while Present (E1) and then E1 /= Instance loop
6912 if Ekind (E1) = E_Package
6913 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6915 if Renamed_Object (E1) = Pack then
6918 elsif E1 = P or else Renamed_Object (E1) = P then
6921 elsif Is_Actual_Of_Previous_Formal (E1) then
6930 end Is_Actual_Of_Previous_Formal;
6932 -- Start of processing for Denotes_Formal_Package
6938 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6940 Par := Current_Instantiated_Parent.Act_Id;
6943 if Ekind (Scop) = E_Generic_Package
6944 or else Nkind (Unit_Declaration_Node (Scop)) =
6945 N_Generic_Subprogram_Declaration
6949 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6950 N_Formal_Package_Declaration
6958 -- Check whether this package is associated with a formal package of
6959 -- the enclosing instantiation. Iterate over the list of renamings.
6961 E := First_Entity (Par);
6962 while Present (E) loop
6963 if Ekind (E) /= E_Package
6964 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6968 elsif Renamed_Object (E) = Par then
6971 elsif Renamed_Object (E) = Pack then
6974 elsif Is_Actual_Of_Previous_Formal (E) then
6984 end Denotes_Formal_Package;
6990 procedure End_Generic is
6992 -- ??? More things could be factored out in this routine. Should
6993 -- probably be done at a later stage.
6995 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6996 Generic_Flags.Decrement_Last;
6998 Expander_Mode_Restore;
7005 function Earlier (N1, N2 : Node_Id) return Boolean is
7006 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
7007 -- Find distance from given node to enclosing compilation unit
7013 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
7016 and then Nkind (P) /= N_Compilation_Unit
7018 P := True_Parent (P);
7023 -- Local declarations
7030 -- Start of processing for Earlier
7033 Find_Depth (P1, D1);
7034 Find_Depth (P2, D2);
7044 P1 := True_Parent (P1);
7049 P2 := True_Parent (P2);
7053 -- At this point P1 and P2 are at the same distance from the root.
7054 -- We examine their parents until we find a common declarative list.
7055 -- If we reach the root, N1 and N2 do not descend from the same
7056 -- declarative list (e.g. one is nested in the declarative part and
7057 -- the other is in a block in the statement part) and the earlier
7058 -- one is already frozen.
7060 while not Is_List_Member (P1)
7061 or else not Is_List_Member (P2)
7062 or else List_Containing (P1) /= List_Containing (P2)
7064 P1 := True_Parent (P1);
7065 P2 := True_Parent (P2);
7067 if Nkind (Parent (P1)) = N_Subunit then
7068 P1 := Corresponding_Stub (Parent (P1));
7071 if Nkind (Parent (P2)) = N_Subunit then
7072 P2 := Corresponding_Stub (Parent (P2));
7080 -- Expanded code usually shares the source location of the original
7081 -- construct it was generated for. This however may not necessarely
7082 -- reflect the true location of the code within the tree.
7084 -- Before comparing the slocs of the two nodes, make sure that we are
7085 -- working with correct source locations. Assume that P1 is to the left
7086 -- of P2. If either one does not come from source, traverse the common
7087 -- list heading towards the other node and locate the first source
7091 -- ----+===+===+--------------+===+===+----
7092 -- expanded code expanded code
7094 if not Comes_From_Source (P1) then
7095 while Present (P1) loop
7097 -- Neither P2 nor a source statement were located during the
7098 -- search. If we reach the end of the list, then P1 does not
7099 -- occur earlier than P2.
7102 -- start --- P2 ----- P1 --- end
7104 if No (Next (P1)) then
7107 -- We encounter P2 while going to the right of the list. This
7108 -- means that P1 does indeed appear earlier.
7111 -- start --- P1 ===== P2 --- end
7112 -- expanded code in between
7117 -- No need to look any further since we have located a source
7120 elsif Comes_From_Source (P1) then
7130 if not Comes_From_Source (P2) then
7131 while Present (P2) loop
7133 -- Neither P1 nor a source statement were located during the
7134 -- search. If we reach the start of the list, then P1 does not
7135 -- occur earlier than P2.
7138 -- start --- P2 --- P1 --- end
7140 if No (Prev (P2)) then
7143 -- We encounter P1 while going to the left of the list. This
7144 -- means that P1 does indeed appear earlier.
7147 -- start --- P1 ===== P2 --- end
7148 -- expanded code in between
7153 -- No need to look any further since we have located a source
7156 elsif Comes_From_Source (P2) then
7166 -- At this point either both nodes came from source or we approximated
7167 -- their source locations through neighbouring source statements. There
7168 -- is no need to look at the top level locations of P1 and P2 because
7169 -- both nodes are in the same list and whether the enclosing context is
7170 -- instantiated is irrelevant.
7172 return Sloc (P1) < Sloc (P2);
7175 ----------------------
7176 -- Find_Actual_Type --
7177 ----------------------
7179 function Find_Actual_Type
7181 Gen_Type : Entity_Id) return Entity_Id
7183 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
7187 -- Special processing only applies to child units
7189 if not Is_Child_Unit (Gen_Scope) then
7190 return Get_Instance_Of (Typ);
7192 -- If designated or component type is itself a formal of the child unit,
7193 -- its instance is available.
7195 elsif Scope (Typ) = Gen_Scope then
7196 return Get_Instance_Of (Typ);
7198 -- If the array or access type is not declared in the parent unit,
7199 -- no special processing needed.
7201 elsif not Is_Generic_Type (Typ)
7202 and then Scope (Gen_Scope) /= Scope (Typ)
7204 return Get_Instance_Of (Typ);
7206 -- Otherwise, retrieve designated or component type by visibility
7209 T := Current_Entity (Typ);
7210 while Present (T) loop
7211 if In_Open_Scopes (Scope (T)) then
7214 elsif Is_Generic_Actual_Type (T) then
7223 end Find_Actual_Type;
7225 ----------------------------
7226 -- Freeze_Subprogram_Body --
7227 ----------------------------
7229 procedure Freeze_Subprogram_Body
7230 (Inst_Node : Node_Id;
7232 Pack_Id : Entity_Id)
7234 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7235 Par : constant Entity_Id := Scope (Gen_Unit);
7241 function Enclosing_Package_Body (N : Node_Id) return Node_Id;
7242 -- Find innermost package body that encloses the given node, and which
7243 -- is not a compilation unit. Freeze nodes for the instance, or for its
7244 -- enclosing body, may be inserted after the enclosing_body of the
7245 -- generic unit. Used to determine proper placement of freeze node for
7246 -- both package and subprogram instances.
7248 function Package_Freeze_Node (B : Node_Id) return Node_Id;
7249 -- Find entity for given package body, and locate or create a freeze
7252 ----------------------------
7253 -- Enclosing_Package_Body --
7254 ----------------------------
7256 function Enclosing_Package_Body (N : Node_Id) return Node_Id is
7262 and then Nkind (Parent (P)) /= N_Compilation_Unit
7264 if Nkind (P) = N_Package_Body then
7265 if Nkind (Parent (P)) = N_Subunit then
7266 return Corresponding_Stub (Parent (P));
7272 P := True_Parent (P);
7276 end Enclosing_Package_Body;
7278 -------------------------
7279 -- Package_Freeze_Node --
7280 -------------------------
7282 function Package_Freeze_Node (B : Node_Id) return Node_Id is
7286 if Nkind (B) = N_Package_Body then
7287 Id := Corresponding_Spec (B);
7288 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
7289 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
7292 Ensure_Freeze_Node (Id);
7293 return Freeze_Node (Id);
7294 end Package_Freeze_Node;
7296 -- Start of processing of Freeze_Subprogram_Body
7299 -- If the instance and the generic body appear within the same unit, and
7300 -- the instance precedes the generic, the freeze node for the instance
7301 -- must appear after that of the generic. If the generic is nested
7302 -- within another instance I2, then current instance must be frozen
7303 -- after I2. In both cases, the freeze nodes are those of enclosing
7304 -- packages. Otherwise, the freeze node is placed at the end of the
7305 -- current declarative part.
7307 Enc_G := Enclosing_Package_Body (Gen_Body);
7308 Enc_I := Enclosing_Package_Body (Inst_Node);
7309 Ensure_Freeze_Node (Pack_Id);
7310 F_Node := Freeze_Node (Pack_Id);
7312 if Is_Generic_Instance (Par)
7313 and then Present (Freeze_Node (Par))
7314 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
7316 -- The parent was a premature instantiation. Insert freeze node at
7317 -- the end the current declarative part.
7319 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
7320 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7322 -- Handle the following case:
7324 -- package Parent_Inst is new ...
7327 -- procedure P ... -- this body freezes Parent_Inst
7329 -- package Inst is new ...
7331 -- In this particular scenario, the freeze node for Inst must be
7332 -- inserted in the same manner as that of Parent_Inst - before the
7333 -- next source body or at the end of the declarative list (body not
7334 -- available). If body P did not exist and Parent_Inst was frozen
7335 -- after Inst, either by a body following Inst or at the end of the
7336 -- declarative region, the freeze node for Inst must be inserted
7337 -- after that of Parent_Inst. This relation is established by
7338 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7340 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
7341 List_Containing (Inst_Node)
7342 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
7344 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7347 Insert_After (Freeze_Node (Par), F_Node);
7350 -- The body enclosing the instance should be frozen after the body that
7351 -- includes the generic, because the body of the instance may make
7352 -- references to entities therein. If the two are not in the same
7353 -- declarative part, or if the one enclosing the instance is frozen
7354 -- already, freeze the instance at the end of the current declarative
7357 elsif Is_Generic_Instance (Par)
7358 and then Present (Freeze_Node (Par))
7359 and then Present (Enc_I)
7361 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
7363 (Nkind (Enc_I) = N_Package_Body
7365 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
7367 -- The enclosing package may contain several instances. Rather
7368 -- than computing the earliest point at which to insert its freeze
7369 -- node, we place it at the end of the declarative part of the
7370 -- parent of the generic.
7372 Insert_Freeze_Node_For_Instance
7373 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
7376 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7378 elsif Present (Enc_G)
7379 and then Present (Enc_I)
7380 and then Enc_G /= Enc_I
7381 and then Earlier (Inst_Node, Gen_Body)
7383 if Nkind (Enc_G) = N_Package_Body then
7384 E_G_Id := Corresponding_Spec (Enc_G);
7385 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
7387 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
7390 -- Freeze package that encloses instance, and place node after
7391 -- package that encloses generic. If enclosing package is already
7392 -- frozen we have to assume it is at the proper place. This may be a
7393 -- potential ABE that requires dynamic checking. Do not add a freeze
7394 -- node if the package that encloses the generic is inside the body
7395 -- that encloses the instance, because the freeze node would be in
7396 -- the wrong scope. Additional contortions needed if the bodies are
7397 -- within a subunit.
7400 Enclosing_Body : Node_Id;
7403 if Nkind (Enc_I) = N_Package_Body_Stub then
7404 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
7406 Enclosing_Body := Enc_I;
7409 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
7410 Insert_Freeze_Node_For_Instance
7411 (Enc_G, Package_Freeze_Node (Enc_I));
7415 -- Freeze enclosing subunit before instance
7417 Ensure_Freeze_Node (E_G_Id);
7419 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7420 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7423 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7426 -- If none of the above, insert freeze node at the end of the current
7427 -- declarative part.
7429 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7431 end Freeze_Subprogram_Body;
7437 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7439 return Generic_Renamings.Table (E).Gen_Id;
7442 ---------------------
7443 -- Get_Instance_Of --
7444 ---------------------
7446 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7447 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7450 if Res /= Assoc_Null then
7451 return Generic_Renamings.Table (Res).Act_Id;
7453 -- On exit, entity is not instantiated: not a generic parameter, or
7454 -- else parameter of an inner generic unit.
7458 end Get_Instance_Of;
7460 ------------------------------------
7461 -- Get_Package_Instantiation_Node --
7462 ------------------------------------
7464 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7465 Decl : Node_Id := Unit_Declaration_Node (A);
7469 -- If the Package_Instantiation attribute has been set on the package
7470 -- entity, then use it directly when it (or its Original_Node) refers
7471 -- to an N_Package_Instantiation node. In principle it should be
7472 -- possible to have this field set in all cases, which should be
7473 -- investigated, and would allow this function to be significantly
7476 Inst := Package_Instantiation (A);
7478 if Present (Inst) then
7479 if Nkind (Inst) = N_Package_Instantiation then
7482 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7483 return Original_Node (Inst);
7487 -- If the instantiation is a compilation unit that does not need body
7488 -- then the instantiation node has been rewritten as a package
7489 -- declaration for the instance, and we return the original node.
7491 -- If it is a compilation unit and the instance node has not been
7492 -- rewritten, then it is still the unit of the compilation. Finally, if
7493 -- a body is present, this is a parent of the main unit whose body has
7494 -- been compiled for inlining purposes, and the instantiation node has
7495 -- been rewritten with the instance body.
7497 -- Otherwise the instantiation node appears after the declaration. If
7498 -- the entity is a formal package, the declaration may have been
7499 -- rewritten as a generic declaration (in the case of a formal with box)
7500 -- or left as a formal package declaration if it has actuals, and is
7501 -- found with a forward search.
7503 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7504 if Nkind (Decl) = N_Package_Declaration
7505 and then Present (Corresponding_Body (Decl))
7507 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7510 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7511 return Original_Node (Decl);
7513 return Unit (Parent (Decl));
7516 elsif Nkind (Decl) = N_Package_Declaration
7517 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7519 return Original_Node (Decl);
7522 Inst := Next (Decl);
7523 while not Nkind_In (Inst, N_Package_Instantiation,
7524 N_Formal_Package_Declaration)
7531 end Get_Package_Instantiation_Node;
7533 ------------------------
7534 -- Has_Been_Exchanged --
7535 ------------------------
7537 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7541 Next := First_Elmt (Exchanged_Views);
7542 while Present (Next) loop
7543 if Full_View (Node (Next)) = E then
7551 end Has_Been_Exchanged;
7557 function Hash (F : Entity_Id) return HTable_Range is
7559 return HTable_Range (F mod HTable_Size);
7562 ------------------------
7563 -- Hide_Current_Scope --
7564 ------------------------
7566 procedure Hide_Current_Scope is
7567 C : constant Entity_Id := Current_Scope;
7571 Set_Is_Hidden_Open_Scope (C);
7573 E := First_Entity (C);
7574 while Present (E) loop
7575 if Is_Immediately_Visible (E) then
7576 Set_Is_Immediately_Visible (E, False);
7577 Append_Elmt (E, Hidden_Entities);
7583 -- Make the scope name invisible as well. This is necessary, but might
7584 -- conflict with calls to Rtsfind later on, in case the scope is a
7585 -- predefined one. There is no clean solution to this problem, so for
7586 -- now we depend on the user not redefining Standard itself in one of
7587 -- the parent units.
7589 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7590 Set_Is_Immediately_Visible (C, False);
7591 Append_Elmt (C, Hidden_Entities);
7594 end Hide_Current_Scope;
7600 procedure Init_Env is
7601 Saved : Instance_Env;
7604 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7605 Saved.Exchanged_Views := Exchanged_Views;
7606 Saved.Hidden_Entities := Hidden_Entities;
7607 Saved.Current_Sem_Unit := Current_Sem_Unit;
7608 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7609 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7611 -- Save configuration switches. These may be reset if the unit is a
7612 -- predefined unit, and the current mode is not Ada 2005.
7614 Save_Opt_Config_Switches (Saved.Switches);
7616 Instance_Envs.Append (Saved);
7618 Exchanged_Views := New_Elmt_List;
7619 Hidden_Entities := New_Elmt_List;
7621 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7622 -- this is set properly in Set_Instance_Env.
7624 Current_Instantiated_Parent :=
7625 (Current_Scope, Current_Scope, Assoc_Null);
7628 ------------------------------
7629 -- In_Same_Declarative_Part --
7630 ------------------------------
7632 function In_Same_Declarative_Part
7634 Inst : Node_Id) return Boolean
7636 Decls : constant Node_Id := Parent (F_Node);
7637 Nod : Node_Id := Parent (Inst);
7640 while Present (Nod) loop
7644 elsif Nkind_In (Nod, N_Subprogram_Body,
7646 N_Package_Declaration,
7653 elsif Nkind (Nod) = N_Subunit then
7654 Nod := Corresponding_Stub (Nod);
7656 elsif Nkind (Nod) = N_Compilation_Unit then
7660 Nod := Parent (Nod);
7665 end In_Same_Declarative_Part;
7667 ---------------------
7668 -- In_Main_Context --
7669 ---------------------
7671 function In_Main_Context (E : Entity_Id) return Boolean is
7677 if not Is_Compilation_Unit (E)
7678 or else Ekind (E) /= E_Package
7679 or else In_Private_Part (E)
7684 Context := Context_Items (Cunit (Main_Unit));
7686 Clause := First (Context);
7687 while Present (Clause) loop
7688 if Nkind (Clause) = N_With_Clause then
7689 Nam := Name (Clause);
7691 -- If the current scope is part of the context of the main unit,
7692 -- analysis of the corresponding with_clause is not complete, and
7693 -- the entity is not set. We use the Chars field directly, which
7694 -- might produce false positives in rare cases, but guarantees
7695 -- that we produce all the instance bodies we will need.
7697 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7698 or else (Nkind (Nam) = N_Selected_Component
7699 and then Chars (Selector_Name (Nam)) = Chars (E))
7709 end In_Main_Context;
7711 ---------------------
7712 -- Inherit_Context --
7713 ---------------------
7715 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7716 Current_Context : List_Id;
7717 Current_Unit : Node_Id;
7722 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7724 -- The inherited context is attached to the enclosing compilation
7725 -- unit. This is either the main unit, or the declaration for the
7726 -- main unit (in case the instantiation appears within the package
7727 -- declaration and the main unit is its body).
7729 Current_Unit := Parent (Inst);
7730 while Present (Current_Unit)
7731 and then Nkind (Current_Unit) /= N_Compilation_Unit
7733 Current_Unit := Parent (Current_Unit);
7736 Current_Context := Context_Items (Current_Unit);
7738 Item := First (Context_Items (Parent (Gen_Decl)));
7739 while Present (Item) loop
7740 if Nkind (Item) = N_With_Clause then
7742 -- Take care to prevent direct cyclic with's, which can happen
7743 -- if the generic body with's the current unit. Such a case
7744 -- would result in binder errors (or run-time errors if the
7745 -- -gnatE switch is in effect), but we want to prevent it here,
7746 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7747 -- that we don't bother to detect indirect cycles.
7749 if Library_Unit (Item) /= Current_Unit then
7750 New_I := New_Copy (Item);
7751 Set_Implicit_With (New_I, True);
7752 Append (New_I, Current_Context);
7759 end Inherit_Context;
7765 procedure Initialize is
7767 Generic_Renamings.Init;
7770 Generic_Renamings_HTable.Reset;
7771 Circularity_Detected := False;
7772 Exchanged_Views := No_Elist;
7773 Hidden_Entities := No_Elist;
7776 -------------------------------------
7777 -- Insert_Freeze_Node_For_Instance --
7778 -------------------------------------
7780 procedure Insert_Freeze_Node_For_Instance
7784 Inst : constant Entity_Id := Entity (F_Node);
7789 function Enclosing_Body (N : Node_Id) return Node_Id;
7790 -- Find enclosing package or subprogram body, if any. Freeze node
7791 -- may be placed at end of current declarative list if previous
7792 -- instance and current one have different enclosing bodies.
7794 function Previous_Instance (Gen : Entity_Id) return Entity_Id;
7795 -- Find the local instance, if any, that declares the generic that is
7796 -- being instantiated. If present, the freeze node for this instance
7797 -- must follow the freeze node for the previous instance.
7799 --------------------
7800 -- Enclosing_Body --
7801 --------------------
7803 function Enclosing_Body (N : Node_Id) return Node_Id is
7809 and then Nkind (Parent (P)) /= N_Compilation_Unit
7811 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then
7812 if Nkind (Parent (P)) = N_Subunit then
7813 return Corresponding_Stub (Parent (P));
7819 P := True_Parent (P);
7825 -----------------------
7826 -- Previous_Instance --
7827 -----------------------
7829 function Previous_Instance (Gen : Entity_Id) return Entity_Id is
7835 and then S /= Standard_Standard
7837 if Is_Generic_Instance (S)
7838 and then In_Same_Source_Unit (S, N)
7847 end Previous_Instance;
7849 -- Start of processing for Insert_Freeze_Node_For_Instance
7852 if not Is_List_Member (F_Node) then
7853 Decls := List_Containing (N);
7854 Par_N := Parent (Decls);
7857 -- If this is a package instance, check whether the generic is
7858 -- declared in a previous instance and the current instance is
7859 -- not within the previous one.
7861 if Present (Generic_Parent (Parent (Inst)))
7862 and then Is_In_Main_Unit (N)
7865 Enclosing_N : constant Node_Id := Enclosing_Body (N);
7866 Par_I : constant Entity_Id :=
7868 (Generic_Parent (Parent (Inst)));
7873 and then Earlier (N, Freeze_Node (Par_I))
7875 Scop := Scope (Inst);
7877 -- If the current instance is within the one that contains
7878 -- the generic, the freeze node for the current one must
7879 -- appear in the current declarative part. Ditto, if the
7880 -- current instance is within another package instance or
7881 -- within a body that does not enclose the current instance.
7882 -- In these three cases the freeze node of the previous
7883 -- instance is not relevant.
7885 while Present (Scop)
7886 and then Scop /= Standard_Standard
7888 exit when Scop = Par_I
7890 (Is_Generic_Instance (Scop)
7891 and then Scope_Depth (Scop) > Scope_Depth (Par_I));
7892 Scop := Scope (Scop);
7895 -- Previous instance encloses current instance
7897 if Scop = Par_I then
7900 -- If the next node is a source body we must freeze in
7901 -- the current scope as well.
7903 elsif Present (Next (N))
7904 and then Nkind_In (Next (N),
7905 N_Subprogram_Body, N_Package_Body)
7906 and then Comes_From_Source (Next (N))
7910 -- Current instance is within an unrelated instance
7912 elsif Is_Generic_Instance (Scop) then
7915 -- Current instance is within an unrelated body
7917 elsif Present (Enclosing_N)
7918 and then Enclosing_N /= Enclosing_Body (Par_I)
7923 Insert_After (Freeze_Node (Par_I), F_Node);
7930 -- When the instantiation occurs in a package declaration, append the
7931 -- freeze node to the private declarations (if any).
7933 if Nkind (Par_N) = N_Package_Specification
7934 and then Decls = Visible_Declarations (Par_N)
7935 and then Present (Private_Declarations (Par_N))
7936 and then not Is_Empty_List (Private_Declarations (Par_N))
7938 Decls := Private_Declarations (Par_N);
7939 Decl := First (Decls);
7942 -- Determine the proper freeze point of a package instantiation. We
7943 -- adhere to the general rule of a package or subprogram body causing
7944 -- freezing of anything before it in the same declarative region. In
7945 -- this case, the proper freeze point of a package instantiation is
7946 -- before the first source body which follows, or before a stub. This
7947 -- ensures that entities coming from the instance are already frozen
7948 -- and usable in source bodies.
7950 if Nkind (Par_N) /= N_Package_Declaration
7951 and then Ekind (Inst) = E_Package
7952 and then Is_Generic_Instance (Inst)
7954 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
7956 while Present (Decl) loop
7957 if (Nkind (Decl) in N_Unit_Body
7959 Nkind (Decl) in N_Body_Stub)
7960 and then Comes_From_Source (Decl)
7962 Insert_Before (Decl, F_Node);
7970 -- In a package declaration, or if no previous body, insert at end
7973 Set_Sloc (F_Node, Sloc (Last (Decls)));
7974 Insert_After (Last (Decls), F_Node);
7976 end Insert_Freeze_Node_For_Instance;
7982 procedure Install_Body
7983 (Act_Body : Node_Id;
7988 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
7989 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
7990 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
7991 Par : constant Entity_Id := Scope (Gen_Id);
7992 Gen_Unit : constant Node_Id :=
7993 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
7994 Orig_Body : Node_Id := Gen_Body;
7996 Body_Unit : Node_Id;
7998 Must_Delay : Boolean;
8000 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
8001 -- Find subprogram (if any) that encloses instance and/or generic body
8003 function True_Sloc (N : Node_Id) return Source_Ptr;
8004 -- If the instance is nested inside a generic unit, the Sloc of the
8005 -- instance indicates the place of the original definition, not the
8006 -- point of the current enclosing instance. Pending a better usage of
8007 -- Slocs to indicate instantiation places, we determine the place of
8008 -- origin of a node by finding the maximum sloc of any ancestor node.
8009 -- Why is this not equivalent to Top_Level_Location ???
8011 --------------------
8012 -- Enclosing_Subp --
8013 --------------------
8015 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
8020 while Scop /= Standard_Standard
8021 and then not Is_Overloadable (Scop)
8023 Scop := Scope (Scop);
8033 function True_Sloc (N : Node_Id) return Source_Ptr is
8040 while Present (N1) and then N1 /= Act_Unit loop
8041 if Sloc (N1) > Res then
8051 -- Start of processing for Install_Body
8054 -- If the body is a subunit, the freeze point is the corresponding stub
8055 -- in the current compilation, not the subunit itself.
8057 if Nkind (Parent (Gen_Body)) = N_Subunit then
8058 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
8060 Orig_Body := Gen_Body;
8063 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
8065 -- If the instantiation and the generic definition appear in the same
8066 -- package declaration, this is an early instantiation. If they appear
8067 -- in the same declarative part, it is an early instantiation only if
8068 -- the generic body appears textually later, and the generic body is
8069 -- also in the main unit.
8071 -- If instance is nested within a subprogram, and the generic body is
8072 -- not, the instance is delayed because the enclosing body is. If
8073 -- instance and body are within the same scope, or the same sub-
8074 -- program body, indicate explicitly that the instance is delayed.
8077 (Gen_Unit = Act_Unit
8078 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
8079 N_Generic_Package_Declaration)
8080 or else (Gen_Unit = Body_Unit
8081 and then True_Sloc (N) < Sloc (Orig_Body)))
8082 and then Is_In_Main_Unit (Gen_Unit)
8083 and then (Scope (Act_Id) = Scope (Gen_Id)
8085 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
8087 -- If this is an early instantiation, the freeze node is placed after
8088 -- the generic body. Otherwise, if the generic appears in an instance,
8089 -- we cannot freeze the current instance until the outer one is frozen.
8090 -- This is only relevant if the current instance is nested within some
8091 -- inner scope not itself within the outer instance. If this scope is
8092 -- a package body in the same declarative part as the outer instance,
8093 -- then that body needs to be frozen after the outer instance. Finally,
8094 -- if no delay is needed, we place the freeze node at the end of the
8095 -- current declarative part.
8097 if Expander_Active then
8098 Ensure_Freeze_Node (Act_Id);
8099 F_Node := Freeze_Node (Act_Id);
8102 Insert_After (Orig_Body, F_Node);
8104 elsif Is_Generic_Instance (Par)
8105 and then Present (Freeze_Node (Par))
8106 and then Scope (Act_Id) /= Par
8108 -- Freeze instance of inner generic after instance of enclosing
8111 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
8113 -- Handle the following case:
8115 -- package Parent_Inst is new ...
8118 -- procedure P ... -- this body freezes Parent_Inst
8120 -- package Inst is new ...
8122 -- In this particular scenario, the freeze node for Inst must
8123 -- be inserted in the same manner as that of Parent_Inst -
8124 -- before the next source body or at the end of the declarative
8125 -- list (body not available). If body P did not exist and
8126 -- Parent_Inst was frozen after Inst, either by a body
8127 -- following Inst or at the end of the declarative region, the
8128 -- freeze node for Inst must be inserted after that of
8129 -- Parent_Inst. This relation is established by comparing the
8130 -- Slocs of Parent_Inst freeze node and Inst.
8132 if List_Containing (Get_Package_Instantiation_Node (Par)) =
8134 and then Sloc (Freeze_Node (Par)) < Sloc (N)
8136 Insert_Freeze_Node_For_Instance (N, F_Node);
8138 Insert_After (Freeze_Node (Par), F_Node);
8141 -- Freeze package enclosing instance of inner generic after
8142 -- instance of enclosing generic.
8144 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body)
8145 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
8148 Enclosing : Entity_Id;
8151 Enclosing := Corresponding_Spec (Parent (N));
8153 if No (Enclosing) then
8154 Enclosing := Defining_Entity (Parent (N));
8157 Insert_Freeze_Node_For_Instance (N, F_Node);
8158 Ensure_Freeze_Node (Enclosing);
8160 if not Is_List_Member (Freeze_Node (Enclosing)) then
8162 -- The enclosing context is a subunit, insert the freeze
8163 -- node after the stub.
8165 if Nkind (Parent (Parent (N))) = N_Subunit then
8166 Insert_Freeze_Node_For_Instance
8167 (Corresponding_Stub (Parent (Parent (N))),
8168 Freeze_Node (Enclosing));
8170 -- The enclosing context is a package with a stub body
8171 -- which has already been replaced by the real body.
8172 -- Insert the freeze node after the actual body.
8174 elsif Ekind (Enclosing) = E_Package
8175 and then Present (Body_Entity (Enclosing))
8176 and then Was_Originally_Stub
8177 (Parent (Body_Entity (Enclosing)))
8179 Insert_Freeze_Node_For_Instance
8180 (Parent (Body_Entity (Enclosing)),
8181 Freeze_Node (Enclosing));
8183 -- The parent instance has been frozen before the body of
8184 -- the enclosing package, insert the freeze node after
8187 elsif List_Containing (Freeze_Node (Par)) =
8188 List_Containing (Parent (N))
8189 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
8191 Insert_Freeze_Node_For_Instance
8192 (Parent (N), Freeze_Node (Enclosing));
8196 (Freeze_Node (Par), Freeze_Node (Enclosing));
8202 Insert_Freeze_Node_For_Instance (N, F_Node);
8206 Insert_Freeze_Node_For_Instance (N, F_Node);
8210 Set_Is_Frozen (Act_Id);
8211 Insert_Before (N, Act_Body);
8212 Mark_Rewrite_Insertion (Act_Body);
8215 -----------------------------
8216 -- Install_Formal_Packages --
8217 -----------------------------
8219 procedure Install_Formal_Packages (Par : Entity_Id) is
8222 Gen_E : Entity_Id := Empty;
8225 E := First_Entity (Par);
8227 -- If we are installing an instance parent, locate the formal packages
8228 -- of its generic parent.
8230 if Is_Generic_Instance (Par) then
8231 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
8232 Gen_E := First_Entity (Gen);
8235 while Present (E) loop
8236 if Ekind (E) = E_Package
8237 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
8239 -- If this is the renaming for the parent instance, done
8241 if Renamed_Object (E) = Par then
8244 -- The visibility of a formal of an enclosing generic is already
8247 elsif Denotes_Formal_Package (E) then
8250 elsif Present (Associated_Formal_Package (E)) then
8251 Check_Generic_Actuals (Renamed_Object (E), True);
8252 Set_Is_Hidden (E, False);
8254 -- Find formal package in generic unit that corresponds to
8255 -- (instance of) formal package in instance.
8257 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
8258 Next_Entity (Gen_E);
8261 if Present (Gen_E) then
8262 Map_Formal_Package_Entities (Gen_E, E);
8268 if Present (Gen_E) then
8269 Next_Entity (Gen_E);
8272 end Install_Formal_Packages;
8274 --------------------
8275 -- Install_Parent --
8276 --------------------
8278 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
8279 Ancestors : constant Elist_Id := New_Elmt_List;
8280 S : constant Entity_Id := Current_Scope;
8281 Inst_Par : Entity_Id;
8282 First_Par : Entity_Id;
8283 Inst_Node : Node_Id;
8284 Gen_Par : Entity_Id;
8285 First_Gen : Entity_Id;
8288 procedure Install_Noninstance_Specs (Par : Entity_Id);
8289 -- Install the scopes of noninstance parent units ending with Par
8291 procedure Install_Spec (Par : Entity_Id);
8292 -- The child unit is within the declarative part of the parent, so
8293 -- the declarations within the parent are immediately visible.
8295 -------------------------------
8296 -- Install_Noninstance_Specs --
8297 -------------------------------
8299 procedure Install_Noninstance_Specs (Par : Entity_Id) is
8302 and then Par /= Standard_Standard
8303 and then not In_Open_Scopes (Par)
8305 Install_Noninstance_Specs (Scope (Par));
8308 end Install_Noninstance_Specs;
8314 procedure Install_Spec (Par : Entity_Id) is
8315 Spec : constant Node_Id :=
8316 Specification (Unit_Declaration_Node (Par));
8319 -- If this parent of the child instance is a top-level unit,
8320 -- then record the unit and its visibility for later resetting
8321 -- in Remove_Parent. We exclude units that are generic instances,
8322 -- as we only want to record this information for the ultimate
8323 -- top-level noninstance parent (is that always correct???).
8325 if Scope (Par) = Standard_Standard
8326 and then not Is_Generic_Instance (Par)
8328 Parent_Unit_Visible := Is_Immediately_Visible (Par);
8329 Instance_Parent_Unit := Par;
8332 -- Open the parent scope and make it and its declarations visible.
8333 -- If this point is not within a body, then only the visible
8334 -- declarations should be made visible, and installation of the
8335 -- private declarations is deferred until the appropriate point
8336 -- within analysis of the spec being instantiated (see the handling
8337 -- of parent visibility in Analyze_Package_Specification). This is
8338 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8339 -- private view problems that occur when compiling instantiations of
8340 -- a generic child of that package (Generic_Dispatching_Constructor).
8341 -- If the instance freezes a tagged type, inlinings of operations
8342 -- from Ada.Tags may need the full view of type Tag. If inlining took
8343 -- proper account of establishing visibility of inlined subprograms'
8344 -- parents then it should be possible to remove this
8345 -- special check. ???
8348 Set_Is_Immediately_Visible (Par);
8349 Install_Visible_Declarations (Par);
8350 Set_Use (Visible_Declarations (Spec));
8352 if In_Body or else Is_RTU (Par, Ada_Tags) then
8353 Install_Private_Declarations (Par);
8354 Set_Use (Private_Declarations (Spec));
8358 -- Start of processing for Install_Parent
8361 -- We need to install the parent instance to compile the instantiation
8362 -- of the child, but the child instance must appear in the current
8363 -- scope. Given that we cannot place the parent above the current scope
8364 -- in the scope stack, we duplicate the current scope and unstack both
8365 -- after the instantiation is complete.
8367 -- If the parent is itself the instantiation of a child unit, we must
8368 -- also stack the instantiation of its parent, and so on. Each such
8369 -- ancestor is the prefix of the name in a prior instantiation.
8371 -- If this is a nested instance, the parent unit itself resolves to
8372 -- a renaming of the parent instance, whose declaration we need.
8374 -- Finally, the parent may be a generic (not an instance) when the
8375 -- child unit appears as a formal package.
8379 if Present (Renamed_Entity (Inst_Par)) then
8380 Inst_Par := Renamed_Entity (Inst_Par);
8383 First_Par := Inst_Par;
8386 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
8388 First_Gen := Gen_Par;
8390 while Present (Gen_Par)
8391 and then Is_Child_Unit (Gen_Par)
8393 -- Load grandparent instance as well
8395 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
8397 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
8398 Inst_Par := Entity (Prefix (Name (Inst_Node)));
8400 if Present (Renamed_Entity (Inst_Par)) then
8401 Inst_Par := Renamed_Entity (Inst_Par);
8406 (Specification (Unit_Declaration_Node (Inst_Par)));
8408 if Present (Gen_Par) then
8409 Prepend_Elmt (Inst_Par, Ancestors);
8412 -- Parent is not the name of an instantiation
8414 Install_Noninstance_Specs (Inst_Par);
8425 if Present (First_Gen) then
8426 Append_Elmt (First_Par, Ancestors);
8428 Install_Noninstance_Specs (First_Par);
8431 if not Is_Empty_Elmt_List (Ancestors) then
8432 Elmt := First_Elmt (Ancestors);
8433 while Present (Elmt) loop
8434 Install_Spec (Node (Elmt));
8435 Install_Formal_Packages (Node (Elmt));
8445 -------------------------------
8446 -- Install_Hidden_Primitives --
8447 -------------------------------
8449 procedure Install_Hidden_Primitives
8450 (Prims_List : in out Elist_Id;
8455 List : Elist_Id := No_Elist;
8456 Prim_G_Elmt : Elmt_Id;
8457 Prim_A_Elmt : Elmt_Id;
8462 -- No action needed in case of serious errors because we cannot trust
8463 -- in the order of primitives
8465 if Serious_Errors_Detected > 0 then
8468 -- No action possible if we don't have available the list of primitive
8472 or else not Is_Record_Type (Gen_T)
8473 or else not Is_Tagged_Type (Gen_T)
8474 or else not Is_Record_Type (Act_T)
8475 or else not Is_Tagged_Type (Act_T)
8479 -- There is no need to handle interface types since their primitives
8482 elsif Is_Interface (Gen_T) then
8486 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T));
8488 if not Is_Class_Wide_Type (Act_T) then
8489 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T));
8491 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T)));
8495 -- Skip predefined primitives in the generic formal
8497 while Present (Prim_G_Elmt)
8498 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt))
8500 Next_Elmt (Prim_G_Elmt);
8503 -- Skip predefined primitives in the generic actual
8505 while Present (Prim_A_Elmt)
8506 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt))
8508 Next_Elmt (Prim_A_Elmt);
8511 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt);
8513 Prim_G := Node (Prim_G_Elmt);
8514 Prim_A := Node (Prim_A_Elmt);
8516 -- There is no need to handle interface primitives because their
8517 -- primitives are not hidden
8519 exit when Present (Interface_Alias (Prim_G));
8521 -- Here we install one hidden primitive
8523 if Chars (Prim_G) /= Chars (Prim_A)
8524 and then Has_Suffix (Prim_A, 'P')
8525 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G)
8527 Set_Chars (Prim_A, Chars (Prim_G));
8529 if List = No_Elist then
8530 List := New_Elmt_List;
8533 Append_Elmt (Prim_A, List);
8536 Next_Elmt (Prim_A_Elmt);
8537 Next_Elmt (Prim_G_Elmt);
8540 -- Append the elements to the list of temporarily visible primitives
8541 -- avoiding duplicates.
8543 if Present (List) then
8544 if No (Prims_List) then
8545 Prims_List := New_Elmt_List;
8548 Elmt := First_Elmt (List);
8549 while Present (Elmt) loop
8550 Append_Unique_Elmt (Node (Elmt), Prims_List);
8554 end Install_Hidden_Primitives;
8556 -------------------------------
8557 -- Restore_Hidden_Primitives --
8558 -------------------------------
8560 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is
8561 Prim_Elmt : Elmt_Id;
8565 if Prims_List /= No_Elist then
8566 Prim_Elmt := First_Elmt (Prims_List);
8567 while Present (Prim_Elmt) loop
8568 Prim := Node (Prim_Elmt);
8569 Set_Chars (Prim, Add_Suffix (Prim, 'P'));
8570 Next_Elmt (Prim_Elmt);
8573 Prims_List := No_Elist;
8575 end Restore_Hidden_Primitives;
8577 --------------------------------
8578 -- Instantiate_Formal_Package --
8579 --------------------------------
8581 function Instantiate_Formal_Package
8584 Analyzed_Formal : Node_Id) return List_Id
8586 Loc : constant Source_Ptr := Sloc (Actual);
8587 Actual_Pack : Entity_Id;
8588 Formal_Pack : Entity_Id;
8589 Gen_Parent : Entity_Id;
8592 Parent_Spec : Node_Id;
8594 procedure Find_Matching_Actual
8596 Act : in out Entity_Id);
8597 -- We need to associate each formal entity in the formal package
8598 -- with the corresponding entity in the actual package. The actual
8599 -- package has been analyzed and possibly expanded, and as a result
8600 -- there is no one-to-one correspondence between the two lists (for
8601 -- example, the actual may include subtypes, itypes, and inherited
8602 -- primitive operations, interspersed among the renaming declarations
8603 -- for the actuals) . We retrieve the corresponding actual by name
8604 -- because each actual has the same name as the formal, and they do
8605 -- appear in the same order.
8607 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
8608 -- Retrieve entity of defining entity of generic formal parameter.
8609 -- Only the declarations of formals need to be considered when
8610 -- linking them to actuals, but the declarative list may include
8611 -- internal entities generated during analysis, and those are ignored.
8613 procedure Match_Formal_Entity
8614 (Formal_Node : Node_Id;
8615 Formal_Ent : Entity_Id;
8616 Actual_Ent : Entity_Id);
8617 -- Associates the formal entity with the actual. In the case
8618 -- where Formal_Ent is a formal package, this procedure iterates
8619 -- through all of its formals and enters associations between the
8620 -- actuals occurring in the formal package's corresponding actual
8621 -- package (given by Actual_Ent) and the formal package's formal
8622 -- parameters. This procedure recurses if any of the parameters is
8623 -- itself a package.
8625 function Is_Instance_Of
8626 (Act_Spec : Entity_Id;
8627 Gen_Anc : Entity_Id) return Boolean;
8628 -- The actual can be an instantiation of a generic within another
8629 -- instance, in which case there is no direct link from it to the
8630 -- original generic ancestor. In that case, we recognize that the
8631 -- ultimate ancestor is the same by examining names and scopes.
8633 procedure Process_Nested_Formal (Formal : Entity_Id);
8634 -- If the current formal is declared with a box, its own formals are
8635 -- visible in the instance, as they were in the generic, and their
8636 -- Hidden flag must be reset. If some of these formals are themselves
8637 -- packages declared with a box, the processing must be recursive.
8639 --------------------------
8640 -- Find_Matching_Actual --
8641 --------------------------
8643 procedure Find_Matching_Actual
8645 Act : in out Entity_Id)
8647 Formal_Ent : Entity_Id;
8650 case Nkind (Original_Node (F)) is
8651 when N_Formal_Object_Declaration |
8652 N_Formal_Type_Declaration =>
8653 Formal_Ent := Defining_Identifier (F);
8655 while Chars (Act) /= Chars (Formal_Ent) loop
8659 when N_Formal_Subprogram_Declaration |
8660 N_Formal_Package_Declaration |
8661 N_Package_Declaration |
8662 N_Generic_Package_Declaration =>
8663 Formal_Ent := Defining_Entity (F);
8665 while Chars (Act) /= Chars (Formal_Ent) loop
8670 raise Program_Error;
8672 end Find_Matching_Actual;
8674 -------------------------
8675 -- Match_Formal_Entity --
8676 -------------------------
8678 procedure Match_Formal_Entity
8679 (Formal_Node : Node_Id;
8680 Formal_Ent : Entity_Id;
8681 Actual_Ent : Entity_Id)
8683 Act_Pkg : Entity_Id;
8686 Set_Instance_Of (Formal_Ent, Actual_Ent);
8688 if Ekind (Actual_Ent) = E_Package then
8690 -- Record associations for each parameter
8692 Act_Pkg := Actual_Ent;
8695 A_Ent : Entity_Id := First_Entity (Act_Pkg);
8704 -- Retrieve the actual given in the formal package declaration
8706 Actual := Entity (Name (Original_Node (Formal_Node)));
8708 -- The actual in the formal package declaration may be a
8709 -- renamed generic package, in which case we want to retrieve
8710 -- the original generic in order to traverse its formal part.
8712 if Present (Renamed_Entity (Actual)) then
8713 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8715 Gen_Decl := Unit_Declaration_Node (Actual);
8718 Formals := Generic_Formal_Declarations (Gen_Decl);
8720 if Present (Formals) then
8721 F_Node := First_Non_Pragma (Formals);
8726 while Present (A_Ent)
8727 and then Present (F_Node)
8728 and then A_Ent /= First_Private_Entity (Act_Pkg)
8730 F_Ent := Get_Formal_Entity (F_Node);
8732 if Present (F_Ent) then
8734 -- This is a formal of the original package. Record
8735 -- association and recurse.
8737 Find_Matching_Actual (F_Node, A_Ent);
8738 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8739 Next_Entity (A_Ent);
8742 Next_Non_Pragma (F_Node);
8746 end Match_Formal_Entity;
8748 -----------------------
8749 -- Get_Formal_Entity --
8750 -----------------------
8752 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8753 Kind : constant Node_Kind := Nkind (Original_Node (N));
8756 when N_Formal_Object_Declaration =>
8757 return Defining_Identifier (N);
8759 when N_Formal_Type_Declaration =>
8760 return Defining_Identifier (N);
8762 when N_Formal_Subprogram_Declaration =>
8763 return Defining_Unit_Name (Specification (N));
8765 when N_Formal_Package_Declaration =>
8766 return Defining_Identifier (Original_Node (N));
8768 when N_Generic_Package_Declaration =>
8769 return Defining_Identifier (Original_Node (N));
8771 -- All other declarations are introduced by semantic analysis and
8772 -- have no match in the actual.
8777 end Get_Formal_Entity;
8779 --------------------
8780 -- Is_Instance_Of --
8781 --------------------
8783 function Is_Instance_Of
8784 (Act_Spec : Entity_Id;
8785 Gen_Anc : Entity_Id) return Boolean
8787 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8790 if No (Gen_Par) then
8793 -- Simplest case: the generic parent of the actual is the formal
8795 elsif Gen_Par = Gen_Anc then
8798 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
8801 -- The actual may be obtained through several instantiations. Its
8802 -- scope must itself be an instance of a generic declared in the
8803 -- same scope as the formal. Any other case is detected above.
8805 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
8809 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
8813 ---------------------------
8814 -- Process_Nested_Formal --
8815 ---------------------------
8817 procedure Process_Nested_Formal (Formal : Entity_Id) is
8821 if Present (Associated_Formal_Package (Formal))
8822 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8824 Ent := First_Entity (Formal);
8825 while Present (Ent) loop
8826 Set_Is_Hidden (Ent, False);
8827 Set_Is_Visible_Formal (Ent);
8828 Set_Is_Potentially_Use_Visible
8829 (Ent, Is_Potentially_Use_Visible (Formal));
8831 if Ekind (Ent) = E_Package then
8832 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
8833 Process_Nested_Formal (Ent);
8839 end Process_Nested_Formal;
8841 -- Start of processing for Instantiate_Formal_Package
8846 if not Is_Entity_Name (Actual)
8847 or else Ekind (Entity (Actual)) /= E_Package
8850 ("expect package instance to instantiate formal", Actual);
8851 Abandon_Instantiation (Actual);
8852 raise Program_Error;
8855 Actual_Pack := Entity (Actual);
8856 Set_Is_Instantiated (Actual_Pack);
8858 -- The actual may be a renamed package, or an outer generic formal
8859 -- package whose instantiation is converted into a renaming.
8861 if Present (Renamed_Object (Actual_Pack)) then
8862 Actual_Pack := Renamed_Object (Actual_Pack);
8865 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
8866 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
8867 Formal_Pack := Defining_Identifier (Analyzed_Formal);
8870 Generic_Parent (Specification (Analyzed_Formal));
8872 Defining_Unit_Name (Specification (Analyzed_Formal));
8875 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
8876 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
8878 Parent_Spec := Parent (Actual_Pack);
8881 if Gen_Parent = Any_Id then
8883 ("previous error in declaration of formal package", Actual);
8884 Abandon_Instantiation (Actual);
8887 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
8893 ("actual parameter must be instance of&", Actual, Gen_Parent);
8894 Abandon_Instantiation (Actual);
8897 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
8898 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
8901 Make_Package_Renaming_Declaration (Loc,
8902 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
8903 Name => New_Reference_To (Actual_Pack, Loc));
8905 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
8906 Defining_Identifier (Formal));
8907 Decls := New_List (Nod);
8909 -- If the formal F has a box, then the generic declarations are
8910 -- visible in the generic G. In an instance of G, the corresponding
8911 -- entities in the actual for F (which are the actuals for the
8912 -- instantiation of the generic that F denotes) must also be made
8913 -- visible for analysis of the current instance. On exit from the
8914 -- current instance, those entities are made private again. If the
8915 -- actual is currently in use, these entities are also use-visible.
8917 -- The loop through the actual entities also steps through the formal
8918 -- entities and enters associations from formals to actuals into the
8919 -- renaming map. This is necessary to properly handle checking of
8920 -- actual parameter associations for later formals that depend on
8921 -- actuals declared in the formal package.
8923 -- In Ada 2005, partial parametrization requires that we make visible
8924 -- the actuals corresponding to formals that were defaulted in the
8925 -- formal package. There formals are identified because they remain
8926 -- formal generics within the formal package, rather than being
8927 -- renamings of the actuals supplied.
8930 Gen_Decl : constant Node_Id :=
8931 Unit_Declaration_Node (Gen_Parent);
8932 Formals : constant List_Id :=
8933 Generic_Formal_Declarations (Gen_Decl);
8935 Actual_Ent : Entity_Id;
8936 Actual_Of_Formal : Node_Id;
8937 Formal_Node : Node_Id;
8938 Formal_Ent : Entity_Id;
8941 if Present (Formals) then
8942 Formal_Node := First_Non_Pragma (Formals);
8944 Formal_Node := Empty;
8947 Actual_Ent := First_Entity (Actual_Pack);
8949 First (Visible_Declarations (Specification (Analyzed_Formal)));
8950 while Present (Actual_Ent)
8951 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8953 if Present (Formal_Node) then
8954 Formal_Ent := Get_Formal_Entity (Formal_Node);
8956 if Present (Formal_Ent) then
8957 Find_Matching_Actual (Formal_Node, Actual_Ent);
8959 (Formal_Node, Formal_Ent, Actual_Ent);
8961 -- We iterate at the same time over the actuals of the
8962 -- local package created for the formal, to determine
8963 -- which one of the formals of the original generic were
8964 -- defaulted in the formal. The corresponding actual
8965 -- entities are visible in the enclosing instance.
8967 if Box_Present (Formal)
8969 (Present (Actual_Of_Formal)
8972 (Get_Formal_Entity (Actual_Of_Formal)))
8974 Set_Is_Hidden (Actual_Ent, False);
8975 Set_Is_Visible_Formal (Actual_Ent);
8976 Set_Is_Potentially_Use_Visible
8977 (Actual_Ent, In_Use (Actual_Pack));
8979 if Ekind (Actual_Ent) = E_Package then
8980 Process_Nested_Formal (Actual_Ent);
8984 Set_Is_Hidden (Actual_Ent);
8985 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
8989 Next_Non_Pragma (Formal_Node);
8990 Next (Actual_Of_Formal);
8993 -- No further formals to match, but the generic part may
8994 -- contain inherited operation that are not hidden in the
8995 -- enclosing instance.
8997 Next_Entity (Actual_Ent);
9001 -- Inherited subprograms generated by formal derived types are
9002 -- also visible if the types are.
9004 Actual_Ent := First_Entity (Actual_Pack);
9005 while Present (Actual_Ent)
9006 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9008 if Is_Overloadable (Actual_Ent)
9010 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
9012 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
9014 Set_Is_Hidden (Actual_Ent, False);
9015 Set_Is_Potentially_Use_Visible
9016 (Actual_Ent, In_Use (Actual_Pack));
9019 Next_Entity (Actual_Ent);
9023 -- If the formal is not declared with a box, reanalyze it as an
9024 -- abbreviated instantiation, to verify the matching rules of 12.7.
9025 -- The actual checks are performed after the generic associations
9026 -- have been analyzed, to guarantee the same visibility for this
9027 -- instantiation and for the actuals.
9029 -- In Ada 2005, the generic associations for the formal can include
9030 -- defaulted parameters. These are ignored during check. This
9031 -- internal instantiation is removed from the tree after conformance
9032 -- checking, because it contains formal declarations for those
9033 -- defaulted parameters, and those should not reach the back-end.
9035 if not Box_Present (Formal) then
9037 I_Pack : constant Entity_Id :=
9038 Make_Temporary (Sloc (Actual), 'P');
9041 Set_Is_Internal (I_Pack);
9044 Make_Package_Instantiation (Sloc (Actual),
9045 Defining_Unit_Name => I_Pack,
9048 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
9049 Generic_Associations =>
9050 Generic_Associations (Formal)));
9056 end Instantiate_Formal_Package;
9058 -----------------------------------
9059 -- Instantiate_Formal_Subprogram --
9060 -----------------------------------
9062 function Instantiate_Formal_Subprogram
9065 Analyzed_Formal : Node_Id) return Node_Id
9068 Formal_Sub : constant Entity_Id :=
9069 Defining_Unit_Name (Specification (Formal));
9070 Analyzed_S : constant Entity_Id :=
9071 Defining_Unit_Name (Specification (Analyzed_Formal));
9072 Decl_Node : Node_Id;
9076 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
9077 -- If the generic is a child unit, the parent has been installed on the
9078 -- scope stack, but a default subprogram cannot resolve to something on
9079 -- the parent because that parent is not really part of the visible
9080 -- context (it is there to resolve explicit local entities). If the
9081 -- default has resolved in this way, we remove the entity from
9082 -- immediate visibility and analyze the node again to emit an error
9083 -- message or find another visible candidate.
9085 procedure Valid_Actual_Subprogram (Act : Node_Id);
9086 -- Perform legality check and raise exception on failure
9088 -----------------------
9089 -- From_Parent_Scope --
9090 -----------------------
9092 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
9093 Gen_Scope : Node_Id;
9096 Gen_Scope := Scope (Analyzed_S);
9097 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop
9098 if Scope (Subp) = Scope (Gen_Scope) then
9102 Gen_Scope := Scope (Gen_Scope);
9106 end From_Parent_Scope;
9108 -----------------------------
9109 -- Valid_Actual_Subprogram --
9110 -----------------------------
9112 procedure Valid_Actual_Subprogram (Act : Node_Id) is
9116 if Is_Entity_Name (Act) then
9117 Act_E := Entity (Act);
9119 elsif Nkind (Act) = N_Selected_Component
9120 and then Is_Entity_Name (Selector_Name (Act))
9122 Act_E := Entity (Selector_Name (Act));
9128 if (Present (Act_E) and then Is_Overloadable (Act_E))
9129 or else Nkind_In (Act, N_Attribute_Reference,
9130 N_Indexed_Component,
9131 N_Character_Literal,
9132 N_Explicit_Dereference)
9138 ("expect subprogram or entry name in instantiation of&",
9139 Instantiation_Node, Formal_Sub);
9140 Abandon_Instantiation (Instantiation_Node);
9142 end Valid_Actual_Subprogram;
9144 -- Start of processing for Instantiate_Formal_Subprogram
9147 New_Spec := New_Copy_Tree (Specification (Formal));
9149 -- The tree copy has created the proper instantiation sloc for the
9150 -- new specification. Use this location for all other constructed
9153 Loc := Sloc (Defining_Unit_Name (New_Spec));
9155 -- Create new entity for the actual (New_Copy_Tree does not)
9157 Set_Defining_Unit_Name
9158 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9160 -- Create new entities for the each of the formals in the
9161 -- specification of the renaming declaration built for the actual.
9163 if Present (Parameter_Specifications (New_Spec)) then
9167 F := First (Parameter_Specifications (New_Spec));
9168 while Present (F) loop
9169 Set_Defining_Identifier (F,
9170 Make_Defining_Identifier (Sloc (F),
9171 Chars => Chars (Defining_Identifier (F))));
9177 -- Find entity of actual. If the actual is an attribute reference, it
9178 -- cannot be resolved here (its formal is missing) but is handled
9179 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9180 -- fully resolved subsequently, when the renaming declaration for the
9181 -- formal is analyzed. If it is an explicit dereference, resolve the
9182 -- prefix but not the actual itself, to prevent interpretation as call.
9184 if Present (Actual) then
9185 Loc := Sloc (Actual);
9186 Set_Sloc (New_Spec, Loc);
9188 if Nkind (Actual) = N_Operator_Symbol then
9189 Find_Direct_Name (Actual);
9191 elsif Nkind (Actual) = N_Explicit_Dereference then
9192 Analyze (Prefix (Actual));
9194 elsif Nkind (Actual) /= N_Attribute_Reference then
9198 Valid_Actual_Subprogram (Actual);
9201 elsif Present (Default_Name (Formal)) then
9202 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
9203 N_Selected_Component,
9204 N_Indexed_Component,
9205 N_Character_Literal)
9206 and then Present (Entity (Default_Name (Formal)))
9208 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
9210 Nam := New_Copy (Default_Name (Formal));
9211 Set_Sloc (Nam, Loc);
9214 elsif Box_Present (Formal) then
9216 -- Actual is resolved at the point of instantiation. Create an
9217 -- identifier or operator with the same name as the formal.
9219 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
9220 Nam := Make_Operator_Symbol (Loc,
9221 Chars => Chars (Formal_Sub),
9222 Strval => No_String);
9224 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
9227 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
9228 and then Null_Present (Specification (Formal))
9230 -- Generate null body for procedure, for use in the instance
9233 Make_Subprogram_Body (Loc,
9234 Specification => New_Spec,
9235 Declarations => New_List,
9236 Handled_Statement_Sequence =>
9237 Make_Handled_Sequence_Of_Statements (Loc,
9238 Statements => New_List (Make_Null_Statement (Loc))));
9240 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
9244 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
9246 ("missing actual&", Instantiation_Node, Formal_Sub);
9248 ("\in instantiation of & declared#",
9249 Instantiation_Node, Scope (Analyzed_S));
9250 Abandon_Instantiation (Instantiation_Node);
9254 Make_Subprogram_Renaming_Declaration (Loc,
9255 Specification => New_Spec,
9258 -- If we do not have an actual and the formal specified <> then set to
9259 -- get proper default.
9261 if No (Actual) and then Box_Present (Formal) then
9262 Set_From_Default (Decl_Node);
9265 -- Gather possible interpretations for the actual before analyzing the
9266 -- instance. If overloaded, it will be resolved when analyzing the
9267 -- renaming declaration.
9269 if Box_Present (Formal)
9270 and then No (Actual)
9274 if Is_Child_Unit (Scope (Analyzed_S))
9275 and then Present (Entity (Nam))
9277 if not Is_Overloaded (Nam) then
9278 if From_Parent_Scope (Entity (Nam)) then
9279 Set_Is_Immediately_Visible (Entity (Nam), False);
9280 Set_Entity (Nam, Empty);
9281 Set_Etype (Nam, Empty);
9284 Set_Is_Immediately_Visible (Entity (Nam));
9293 Get_First_Interp (Nam, I, It);
9294 while Present (It.Nam) loop
9295 if From_Parent_Scope (It.Nam) then
9299 Get_Next_Interp (I, It);
9306 -- The generic instantiation freezes the actual. This can only be done
9307 -- once the actual is resolved, in the analysis of the renaming
9308 -- declaration. To make the formal subprogram entity available, we set
9309 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9310 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9311 -- of formal abstract subprograms.
9313 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
9315 -- We cannot analyze the renaming declaration, and thus find the actual,
9316 -- until all the actuals are assembled in the instance. For subsequent
9317 -- checks of other actuals, indicate the node that will hold the
9318 -- instance of this formal.
9320 Set_Instance_Of (Analyzed_S, Nam);
9322 if Nkind (Actual) = N_Selected_Component
9323 and then Is_Task_Type (Etype (Prefix (Actual)))
9324 and then not Is_Frozen (Etype (Prefix (Actual)))
9326 -- The renaming declaration will create a body, which must appear
9327 -- outside of the instantiation, We move the renaming declaration
9328 -- out of the instance, and create an additional renaming inside,
9329 -- to prevent freezing anomalies.
9332 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
9335 Set_Defining_Unit_Name (New_Spec, Anon_Id);
9336 Insert_Before (Instantiation_Node, Decl_Node);
9337 Analyze (Decl_Node);
9339 -- Now create renaming within the instance
9342 Make_Subprogram_Renaming_Declaration (Loc,
9343 Specification => New_Copy_Tree (New_Spec),
9344 Name => New_Occurrence_Of (Anon_Id, Loc));
9346 Set_Defining_Unit_Name (Specification (Decl_Node),
9347 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9352 end Instantiate_Formal_Subprogram;
9354 ------------------------
9355 -- Instantiate_Object --
9356 ------------------------
9358 function Instantiate_Object
9361 Analyzed_Formal : Node_Id) return List_Id
9363 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
9364 A_Gen_Obj : constant Entity_Id :=
9365 Defining_Identifier (Analyzed_Formal);
9366 Acc_Def : Node_Id := Empty;
9367 Act_Assoc : constant Node_Id := Parent (Actual);
9368 Actual_Decl : Node_Id := Empty;
9369 Decl_Node : Node_Id;
9372 List : constant List_Id := New_List;
9373 Loc : constant Source_Ptr := Sloc (Actual);
9374 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
9375 Subt_Decl : Node_Id := Empty;
9376 Subt_Mark : Node_Id := Empty;
9379 if Present (Subtype_Mark (Formal)) then
9380 Subt_Mark := Subtype_Mark (Formal);
9382 Check_Access_Definition (Formal);
9383 Acc_Def := Access_Definition (Formal);
9386 -- Sloc for error message on missing actual
9388 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
9390 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
9391 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
9394 Set_Parent (List, Parent (Actual));
9398 if Out_Present (Formal) then
9400 -- An IN OUT generic actual must be a name. The instantiation is a
9401 -- renaming declaration. The actual is the name being renamed. We
9402 -- use the actual directly, rather than a copy, because it is not
9403 -- used further in the list of actuals, and because a copy or a use
9404 -- of relocate_node is incorrect if the instance is nested within a
9405 -- generic. In order to simplify ASIS searches, the Generic_Parent
9406 -- field links the declaration to the generic association.
9411 Instantiation_Node, Gen_Obj);
9413 ("\in instantiation of & declared#",
9414 Instantiation_Node, Scope (A_Gen_Obj));
9415 Abandon_Instantiation (Instantiation_Node);
9418 if Present (Subt_Mark) then
9420 Make_Object_Renaming_Declaration (Loc,
9421 Defining_Identifier => New_Copy (Gen_Obj),
9422 Subtype_Mark => New_Copy_Tree (Subt_Mark),
9425 else pragma Assert (Present (Acc_Def));
9427 Make_Object_Renaming_Declaration (Loc,
9428 Defining_Identifier => New_Copy (Gen_Obj),
9429 Access_Definition => New_Copy_Tree (Acc_Def),
9433 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9435 -- The analysis of the actual may produce Insert_Action nodes, so
9436 -- the declaration must have a context in which to attach them.
9438 Append (Decl_Node, List);
9441 -- Return if the analysis of the actual reported some error
9443 if Etype (Actual) = Any_Type then
9447 -- This check is performed here because Analyze_Object_Renaming will
9448 -- not check it when Comes_From_Source is False. Note though that the
9449 -- check for the actual being the name of an object will be performed
9450 -- in Analyze_Object_Renaming.
9452 if Is_Object_Reference (Actual)
9453 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
9456 ("illegal discriminant-dependent component for in out parameter",
9460 -- The actual has to be resolved in order to check that it is a
9461 -- variable (due to cases such as F (1), where F returns access to an
9462 -- array, and for overloaded prefixes).
9464 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
9466 -- If the type of the formal is not itself a formal, and the
9467 -- current unit is a child unit, the formal type must be declared
9468 -- in a parent, and must be retrieved by visibility.
9471 and then Is_Generic_Unit (Scope (Ftyp))
9472 and then Is_Child_Unit (Scope (A_Gen_Obj))
9475 Temp : constant Node_Id :=
9476 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
9478 Set_Entity (Temp, Empty);
9480 Ftyp := Entity (Temp);
9484 if Is_Private_Type (Ftyp)
9485 and then not Is_Private_Type (Etype (Actual))
9486 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
9487 or else Base_Type (Etype (Actual)) = Ftyp)
9489 -- If the actual has the type of the full view of the formal, or
9490 -- else a non-private subtype of the formal, then the visibility
9491 -- of the formal type has changed. Add to the actuals a subtype
9492 -- declaration that will force the exchange of views in the body
9493 -- of the instance as well.
9496 Make_Subtype_Declaration (Loc,
9497 Defining_Identifier => Make_Temporary (Loc, 'P'),
9498 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
9500 Prepend (Subt_Decl, List);
9502 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
9503 Exchange_Declarations (Ftyp);
9506 Resolve (Actual, Ftyp);
9508 if not Denotes_Variable (Actual) then
9510 ("actual for& must be a variable", Actual, Gen_Obj);
9512 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
9514 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
9515 -- the type of the actual shall resolve to a specific anonymous
9518 if Ada_Version < Ada_2005
9520 Ekind (Base_Type (Ftyp)) /=
9521 E_Anonymous_Access_Type
9523 Ekind (Base_Type (Etype (Actual))) /=
9524 E_Anonymous_Access_Type
9526 Error_Msg_NE ("type of actual does not match type of&",
9531 Note_Possible_Modification (Actual, Sure => True);
9533 -- Check for instantiation of atomic/volatile actual for
9534 -- non-atomic/volatile formal (RM C.6 (12)).
9536 if Is_Atomic_Object (Actual)
9537 and then not Is_Atomic (Orig_Ftyp)
9540 ("cannot instantiate non-atomic formal object " &
9541 "with atomic actual", Actual);
9543 elsif Is_Volatile_Object (Actual)
9544 and then not Is_Volatile (Orig_Ftyp)
9547 ("cannot instantiate non-volatile formal object " &
9548 "with volatile actual", Actual);
9551 -- Formal in-parameter
9554 -- The instantiation of a generic formal in-parameter is constant
9555 -- declaration. The actual is the expression for that declaration.
9557 if Present (Actual) then
9558 if Present (Subt_Mark) then
9560 else pragma Assert (Present (Acc_Def));
9565 Make_Object_Declaration (Loc,
9566 Defining_Identifier => New_Copy (Gen_Obj),
9567 Constant_Present => True,
9568 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9569 Object_Definition => New_Copy_Tree (Def),
9570 Expression => Actual);
9572 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9574 -- A generic formal object of a tagged type is defined to be
9575 -- aliased so the new constant must also be treated as aliased.
9577 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
9578 Set_Aliased_Present (Decl_Node);
9581 Append (Decl_Node, List);
9583 -- No need to repeat (pre-)analysis of some expression nodes
9584 -- already handled in Preanalyze_Actuals.
9586 if Nkind (Actual) /= N_Allocator then
9589 -- Return if the analysis of the actual reported some error
9591 if Etype (Actual) = Any_Type then
9597 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
9601 Typ := Get_Instance_Of (Formal_Type);
9603 Freeze_Before (Instantiation_Node, Typ);
9605 -- If the actual is an aggregate, perform name resolution on
9606 -- its components (the analysis of an aggregate does not do it)
9607 -- to capture local names that may be hidden if the generic is
9610 if Nkind (Actual) = N_Aggregate then
9611 Preanalyze_And_Resolve (Actual, Typ);
9614 if Is_Limited_Type (Typ)
9615 and then not OK_For_Limited_Init (Typ, Actual)
9618 ("initialization not allowed for limited types", Actual);
9619 Explain_Limited_Type (Typ, Actual);
9623 elsif Present (Default_Expression (Formal)) then
9625 -- Use default to construct declaration
9627 if Present (Subt_Mark) then
9629 else pragma Assert (Present (Acc_Def));
9634 Make_Object_Declaration (Sloc (Formal),
9635 Defining_Identifier => New_Copy (Gen_Obj),
9636 Constant_Present => True,
9637 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9638 Object_Definition => New_Copy (Def),
9639 Expression => New_Copy_Tree
9640 (Default_Expression (Formal)));
9642 Append (Decl_Node, List);
9643 Set_Analyzed (Expression (Decl_Node), False);
9648 Instantiation_Node, Gen_Obj);
9649 Error_Msg_NE ("\in instantiation of & declared#",
9650 Instantiation_Node, Scope (A_Gen_Obj));
9652 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
9654 -- Create dummy constant declaration so that instance can be
9655 -- analyzed, to minimize cascaded visibility errors.
9657 if Present (Subt_Mark) then
9659 else pragma Assert (Present (Acc_Def));
9664 Make_Object_Declaration (Loc,
9665 Defining_Identifier => New_Copy (Gen_Obj),
9666 Constant_Present => True,
9667 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9668 Object_Definition => New_Copy (Def),
9670 Make_Attribute_Reference (Sloc (Gen_Obj),
9671 Attribute_Name => Name_First,
9672 Prefix => New_Copy (Def)));
9674 Append (Decl_Node, List);
9677 Abandon_Instantiation (Instantiation_Node);
9682 if Nkind (Actual) in N_Has_Entity then
9683 Actual_Decl := Parent (Entity (Actual));
9686 -- Ada 2005 (AI-423): For a formal object declaration with a null
9687 -- exclusion or an access definition that has a null exclusion: If the
9688 -- actual matching the formal object declaration denotes a generic
9689 -- formal object of another generic unit G, and the instantiation
9690 -- containing the actual occurs within the body of G or within the body
9691 -- of a generic unit declared within the declarative region of G, then
9692 -- the declaration of the formal object of G must have a null exclusion.
9693 -- Otherwise, the subtype of the actual matching the formal object
9694 -- declaration shall exclude null.
9696 if Ada_Version >= Ada_2005
9697 and then Present (Actual_Decl)
9699 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9700 N_Object_Declaration)
9701 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9702 and then not Has_Null_Exclusion (Actual_Decl)
9703 and then Has_Null_Exclusion (Analyzed_Formal)
9705 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9707 ("actual must exclude null to match generic formal#", Actual);
9711 end Instantiate_Object;
9713 ------------------------------
9714 -- Instantiate_Package_Body --
9715 ------------------------------
9717 procedure Instantiate_Package_Body
9718 (Body_Info : Pending_Body_Info;
9719 Inlined_Body : Boolean := False;
9720 Body_Optional : Boolean := False)
9722 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9723 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9724 Loc : constant Source_Ptr := Sloc (Inst_Node);
9726 Gen_Id : constant Node_Id := Name (Inst_Node);
9727 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9728 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9729 Act_Spec : constant Node_Id := Specification (Act_Decl);
9730 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9732 Act_Body_Name : Node_Id;
9734 Gen_Body_Id : Node_Id;
9736 Act_Body_Id : Entity_Id;
9738 Parent_Installed : Boolean := False;
9739 Save_Style_Check : constant Boolean := Style_Check;
9741 Par_Ent : Entity_Id := Empty;
9742 Par_Vis : Boolean := False;
9744 Vis_Prims_List : Elist_Id := No_Elist;
9745 -- List of primitives made temporarily visible in the instantiation
9746 -- to match the visibility of the formal type
9749 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9751 -- The instance body may already have been processed, as the parent of
9752 -- another instance that is inlined (Load_Parent_Of_Generic).
9754 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
9758 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9760 -- Re-establish the state of information on which checks are suppressed.
9761 -- This information was set in Body_Info at the point of instantiation,
9762 -- and now we restore it so that the instance is compiled using the
9763 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9765 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9766 Scope_Suppress := Body_Info.Scope_Suppress;
9767 Opt.Ada_Version := Body_Info.Version;
9769 if No (Gen_Body_Id) then
9770 Load_Parent_Of_Generic
9771 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9772 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9775 -- Establish global variable for sloc adjustment and for error recovery
9777 Instantiation_Node := Inst_Node;
9779 if Present (Gen_Body_Id) then
9780 Save_Env (Gen_Unit, Act_Decl_Id);
9781 Style_Check := False;
9782 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9784 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9786 Create_Instantiation_Source
9787 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
9791 (Original_Node (Gen_Body), Empty, Instantiating => True);
9793 -- Build new name (possibly qualified) for body declaration
9795 Act_Body_Id := New_Copy (Act_Decl_Id);
9797 -- Some attributes of spec entity are not inherited by body entity
9799 Set_Handler_Records (Act_Body_Id, No_List);
9801 if Nkind (Defining_Unit_Name (Act_Spec)) =
9802 N_Defining_Program_Unit_Name
9805 Make_Defining_Program_Unit_Name (Loc,
9806 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
9807 Defining_Identifier => Act_Body_Id);
9809 Act_Body_Name := Act_Body_Id;
9812 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
9814 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
9815 Check_Generic_Actuals (Act_Decl_Id, False);
9817 -- Install primitives hidden at the point of the instantiation but
9818 -- visible when processing the generic formals
9824 E := First_Entity (Act_Decl_Id);
9825 while Present (E) loop
9827 and then Is_Generic_Actual_Type (E)
9828 and then Is_Tagged_Type (E)
9830 Install_Hidden_Primitives
9831 (Prims_List => Vis_Prims_List,
9832 Gen_T => Generic_Parent_Type (Parent (E)),
9840 -- If it is a child unit, make the parent instance (which is an
9841 -- instance of the parent of the generic) visible. The parent
9842 -- instance is the prefix of the name of the generic unit.
9844 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9845 and then Nkind (Gen_Id) = N_Expanded_Name
9847 Par_Ent := Entity (Prefix (Gen_Id));
9848 Par_Vis := Is_Immediately_Visible (Par_Ent);
9849 Install_Parent (Par_Ent, In_Body => True);
9850 Parent_Installed := True;
9852 elsif Is_Child_Unit (Gen_Unit) then
9853 Par_Ent := Scope (Gen_Unit);
9854 Par_Vis := Is_Immediately_Visible (Par_Ent);
9855 Install_Parent (Par_Ent, In_Body => True);
9856 Parent_Installed := True;
9859 -- If the instantiation is a library unit, and this is the main unit,
9860 -- then build the resulting compilation unit nodes for the instance.
9861 -- If this is a compilation unit but it is not the main unit, then it
9862 -- is the body of a unit in the context, that is being compiled
9863 -- because it is encloses some inlined unit or another generic unit
9864 -- being instantiated. In that case, this body is not part of the
9865 -- current compilation, and is not attached to the tree, but its
9866 -- parent must be set for analysis.
9868 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9870 -- Replace instance node with body of instance, and create new
9871 -- node for corresponding instance declaration.
9873 Build_Instance_Compilation_Unit_Nodes
9874 (Inst_Node, Act_Body, Act_Decl);
9875 Analyze (Inst_Node);
9877 if Parent (Inst_Node) = Cunit (Main_Unit) then
9879 -- If the instance is a child unit itself, then set the scope
9880 -- of the expanded body to be the parent of the instantiation
9881 -- (ensuring that the fully qualified name will be generated
9882 -- for the elaboration subprogram).
9884 if Nkind (Defining_Unit_Name (Act_Spec)) =
9885 N_Defining_Program_Unit_Name
9888 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
9892 -- Case where instantiation is not a library unit
9895 -- If this is an early instantiation, i.e. appears textually
9896 -- before the corresponding body and must be elaborated first,
9897 -- indicate that the body instance is to be delayed.
9899 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
9901 -- Now analyze the body. We turn off all checks if this is an
9902 -- internal unit, since there is no reason to have checks on for
9903 -- any predefined run-time library code. All such code is designed
9904 -- to be compiled with checks off.
9906 -- Note that we do NOT apply this criterion to children of GNAT
9907 -- (or on VMS, children of DEC). The latter units must suppress
9908 -- checks explicitly if this is needed.
9910 if Is_Predefined_File_Name
9911 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
9913 Analyze (Act_Body, Suppress => All_Checks);
9919 Inherit_Context (Gen_Body, Inst_Node);
9921 -- Remove the parent instances if they have been placed on the scope
9922 -- stack to compile the body.
9924 if Parent_Installed then
9925 Remove_Parent (In_Body => True);
9927 -- Restore the previous visibility of the parent
9929 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9932 Restore_Hidden_Primitives (Vis_Prims_List);
9933 Restore_Private_Views (Act_Decl_Id);
9935 -- Remove the current unit from visibility if this is an instance
9936 -- that is not elaborated on the fly for inlining purposes.
9938 if not Inlined_Body then
9939 Set_Is_Immediately_Visible (Act_Decl_Id, False);
9943 Style_Check := Save_Style_Check;
9945 -- If we have no body, and the unit requires a body, then complain. This
9946 -- complaint is suppressed if we have detected other errors (since a
9947 -- common reason for missing the body is that it had errors).
9948 -- In CodePeer mode, a warning has been emitted already, no need for
9949 -- further messages.
9951 elsif Unit_Requires_Body (Gen_Unit)
9952 and then not Body_Optional
9954 if CodePeer_Mode then
9957 elsif Serious_Errors_Detected = 0 then
9959 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
9961 -- Don't attempt to perform any cleanup actions if some other error
9962 -- was already detected, since this can cause blowups.
9968 -- Case of package that does not need a body
9971 -- If the instantiation of the declaration is a library unit, rewrite
9972 -- the original package instantiation as a package declaration in the
9973 -- compilation unit node.
9975 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9976 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
9977 Rewrite (Inst_Node, Act_Decl);
9979 -- Generate elaboration entity, in case spec has elaboration code.
9980 -- This cannot be done when the instance is analyzed, because it
9981 -- is not known yet whether the body exists.
9983 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
9984 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
9986 -- If the instantiation is not a library unit, then append the
9987 -- declaration to the list of implicitly generated entities, unless
9988 -- it is already a list member which means that it was already
9991 elsif not Is_List_Member (Act_Decl) then
9992 Mark_Rewrite_Insertion (Act_Decl);
9993 Insert_Before (Inst_Node, Act_Decl);
9997 Expander_Mode_Restore;
9998 end Instantiate_Package_Body;
10000 ---------------------------------
10001 -- Instantiate_Subprogram_Body --
10002 ---------------------------------
10004 procedure Instantiate_Subprogram_Body
10005 (Body_Info : Pending_Body_Info;
10006 Body_Optional : Boolean := False)
10008 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
10009 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
10010 Loc : constant Source_Ptr := Sloc (Inst_Node);
10011 Gen_Id : constant Node_Id := Name (Inst_Node);
10012 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
10013 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
10014 Anon_Id : constant Entity_Id :=
10015 Defining_Unit_Name (Specification (Act_Decl));
10016 Pack_Id : constant Entity_Id :=
10017 Defining_Unit_Name (Parent (Act_Decl));
10019 Gen_Body : Node_Id;
10020 Gen_Body_Id : Node_Id;
10021 Act_Body : Node_Id;
10022 Pack_Body : Node_Id;
10023 Prev_Formal : Entity_Id;
10024 Ret_Expr : Node_Id;
10025 Unit_Renaming : Node_Id;
10027 Parent_Installed : Boolean := False;
10028 Save_Style_Check : constant Boolean := Style_Check;
10030 Par_Ent : Entity_Id := Empty;
10031 Par_Vis : Boolean := False;
10034 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10036 -- Subprogram body may have been created already because of an inline
10037 -- pragma, or because of multiple elaborations of the enclosing package
10038 -- when several instances of the subprogram appear in the main unit.
10040 if Present (Corresponding_Body (Act_Decl)) then
10044 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
10046 -- Re-establish the state of information on which checks are suppressed.
10047 -- This information was set in Body_Info at the point of instantiation,
10048 -- and now we restore it so that the instance is compiled using the
10049 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10051 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
10052 Scope_Suppress := Body_Info.Scope_Suppress;
10053 Opt.Ada_Version := Body_Info.Version;
10055 if No (Gen_Body_Id) then
10057 -- For imported generic subprogram, no body to compile, complete
10058 -- the spec entity appropriately.
10060 if Is_Imported (Gen_Unit) then
10061 Set_Is_Imported (Anon_Id);
10062 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
10063 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
10064 Set_Convention (Anon_Id, Convention (Gen_Unit));
10065 Set_Has_Completion (Anon_Id);
10068 -- For other cases, compile the body
10071 Load_Parent_Of_Generic
10072 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10073 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10077 Instantiation_Node := Inst_Node;
10079 if Present (Gen_Body_Id) then
10080 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10082 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
10084 -- Either body is not present, or context is non-expanding, as
10085 -- when compiling a subunit. Mark the instance as completed, and
10086 -- diagnose a missing body when needed.
10089 and then Operating_Mode = Generate_Code
10092 ("missing proper body for instantiation", Gen_Body);
10095 Set_Has_Completion (Anon_Id);
10099 Save_Env (Gen_Unit, Anon_Id);
10100 Style_Check := False;
10101 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10102 Create_Instantiation_Source
10110 (Original_Node (Gen_Body), Empty, Instantiating => True);
10112 -- Create proper defining name for the body, to correspond to
10113 -- the one in the spec.
10115 Set_Defining_Unit_Name (Specification (Act_Body),
10116 Make_Defining_Identifier
10117 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
10118 Set_Corresponding_Spec (Act_Body, Anon_Id);
10119 Set_Has_Completion (Anon_Id);
10120 Check_Generic_Actuals (Pack_Id, False);
10122 -- Generate a reference to link the visible subprogram instance to
10123 -- the generic body, which for navigation purposes is the only
10124 -- available source for the instance.
10127 (Related_Instance (Pack_Id),
10128 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
10130 -- If it is a child unit, make the parent instance (which is an
10131 -- instance of the parent of the generic) visible. The parent
10132 -- instance is the prefix of the name of the generic unit.
10134 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10135 and then Nkind (Gen_Id) = N_Expanded_Name
10137 Par_Ent := Entity (Prefix (Gen_Id));
10138 Par_Vis := Is_Immediately_Visible (Par_Ent);
10139 Install_Parent (Par_Ent, In_Body => True);
10140 Parent_Installed := True;
10142 elsif Is_Child_Unit (Gen_Unit) then
10143 Par_Ent := Scope (Gen_Unit);
10144 Par_Vis := Is_Immediately_Visible (Par_Ent);
10145 Install_Parent (Par_Ent, In_Body => True);
10146 Parent_Installed := True;
10149 -- Inside its body, a reference to the generic unit is a reference
10150 -- to the instance. The corresponding renaming is the first
10151 -- declaration in the body.
10154 Make_Subprogram_Renaming_Declaration (Loc,
10156 Copy_Generic_Node (
10157 Specification (Original_Node (Gen_Body)),
10159 Instantiating => True),
10160 Name => New_Occurrence_Of (Anon_Id, Loc));
10162 -- If there is a formal subprogram with the same name as the unit
10163 -- itself, do not add this renaming declaration. This is a temporary
10164 -- fix for one ACVC test. ???
10166 Prev_Formal := First_Entity (Pack_Id);
10167 while Present (Prev_Formal) loop
10168 if Chars (Prev_Formal) = Chars (Gen_Unit)
10169 and then Is_Overloadable (Prev_Formal)
10174 Next_Entity (Prev_Formal);
10177 if Present (Prev_Formal) then
10178 Decls := New_List (Act_Body);
10180 Decls := New_List (Unit_Renaming, Act_Body);
10183 -- The subprogram body is placed in the body of a dummy package body,
10184 -- whose spec contains the subprogram declaration as well as the
10185 -- renaming declarations for the generic parameters.
10187 Pack_Body := Make_Package_Body (Loc,
10188 Defining_Unit_Name => New_Copy (Pack_Id),
10189 Declarations => Decls);
10191 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10193 -- If the instantiation is a library unit, then build resulting
10194 -- compilation unit nodes for the instance. The declaration of
10195 -- the enclosing package is the grandparent of the subprogram
10196 -- declaration. First replace the instantiation node as the unit
10197 -- of the corresponding compilation.
10199 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10200 if Parent (Inst_Node) = Cunit (Main_Unit) then
10201 Set_Unit (Parent (Inst_Node), Inst_Node);
10202 Build_Instance_Compilation_Unit_Nodes
10203 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
10204 Analyze (Inst_Node);
10206 Set_Parent (Pack_Body, Parent (Inst_Node));
10207 Analyze (Pack_Body);
10211 Insert_Before (Inst_Node, Pack_Body);
10212 Mark_Rewrite_Insertion (Pack_Body);
10213 Analyze (Pack_Body);
10215 if Expander_Active then
10216 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
10220 Inherit_Context (Gen_Body, Inst_Node);
10222 Restore_Private_Views (Pack_Id, False);
10224 if Parent_Installed then
10225 Remove_Parent (In_Body => True);
10227 -- Restore the previous visibility of the parent
10229 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
10233 Style_Check := Save_Style_Check;
10235 -- Body not found. Error was emitted already. If there were no previous
10236 -- errors, this may be an instance whose scope is a premature instance.
10237 -- In that case we must insure that the (legal) program does raise
10238 -- program error if executed. We generate a subprogram body for this
10239 -- purpose. See DEC ac30vso.
10241 -- Should not reference proprietary DEC tests in comments ???
10243 elsif Serious_Errors_Detected = 0
10244 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
10246 if Body_Optional then
10249 elsif Ekind (Anon_Id) = E_Procedure then
10251 Make_Subprogram_Body (Loc,
10253 Make_Procedure_Specification (Loc,
10254 Defining_Unit_Name =>
10255 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10256 Parameter_Specifications =>
10258 (Parameter_Specifications (Parent (Anon_Id)))),
10260 Declarations => Empty_List,
10261 Handled_Statement_Sequence =>
10262 Make_Handled_Sequence_Of_Statements (Loc,
10265 Make_Raise_Program_Error (Loc,
10267 PE_Access_Before_Elaboration))));
10271 Make_Raise_Program_Error (Loc,
10272 Reason => PE_Access_Before_Elaboration);
10274 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
10275 Set_Analyzed (Ret_Expr);
10278 Make_Subprogram_Body (Loc,
10280 Make_Function_Specification (Loc,
10281 Defining_Unit_Name =>
10282 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10283 Parameter_Specifications =>
10285 (Parameter_Specifications (Parent (Anon_Id))),
10286 Result_Definition =>
10287 New_Occurrence_Of (Etype (Anon_Id), Loc)),
10289 Declarations => Empty_List,
10290 Handled_Statement_Sequence =>
10291 Make_Handled_Sequence_Of_Statements (Loc,
10294 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
10297 Pack_Body := Make_Package_Body (Loc,
10298 Defining_Unit_Name => New_Copy (Pack_Id),
10299 Declarations => New_List (Act_Body));
10301 Insert_After (Inst_Node, Pack_Body);
10302 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10303 Analyze (Pack_Body);
10306 Expander_Mode_Restore;
10307 end Instantiate_Subprogram_Body;
10309 ----------------------
10310 -- Instantiate_Type --
10311 ----------------------
10313 function Instantiate_Type
10316 Analyzed_Formal : Node_Id;
10317 Actual_Decls : List_Id) return List_Id
10319 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
10320 A_Gen_T : constant Entity_Id :=
10321 Defining_Identifier (Analyzed_Formal);
10322 Ancestor : Entity_Id := Empty;
10323 Def : constant Node_Id := Formal_Type_Definition (Formal);
10325 Decl_Node : Node_Id;
10326 Decl_Nodes : List_Id;
10330 procedure Validate_Array_Type_Instance;
10331 procedure Validate_Access_Subprogram_Instance;
10332 procedure Validate_Access_Type_Instance;
10333 procedure Validate_Derived_Type_Instance;
10334 procedure Validate_Derived_Interface_Type_Instance;
10335 procedure Validate_Discriminated_Formal_Type;
10336 procedure Validate_Interface_Type_Instance;
10337 procedure Validate_Private_Type_Instance;
10338 procedure Validate_Incomplete_Type_Instance;
10339 -- These procedures perform validation tests for the named case.
10340 -- Validate_Discriminated_Formal_Type is shared by formal private
10341 -- types and Ada 2012 formal incomplete types.
10343 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
10344 -- Check that base types are the same and that the subtypes match
10345 -- statically. Used in several of the above.
10347 --------------------
10348 -- Subtypes_Match --
10349 --------------------
10351 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
10352 T : constant Entity_Id := Get_Instance_Of (Gen_T);
10355 return (Base_Type (T) = Base_Type (Act_T)
10356 and then Subtypes_Statically_Match (T, Act_T))
10358 or else (Is_Class_Wide_Type (Gen_T)
10359 and then Is_Class_Wide_Type (Act_T)
10362 (Get_Instance_Of (Root_Type (Gen_T)),
10363 Root_Type (Act_T)))
10366 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
10367 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
10368 and then Ekind (Act_T) = Ekind (Gen_T)
10370 Subtypes_Statically_Match
10371 (Designated_Type (Gen_T), Designated_Type (Act_T)));
10372 end Subtypes_Match;
10374 -----------------------------------------
10375 -- Validate_Access_Subprogram_Instance --
10376 -----------------------------------------
10378 procedure Validate_Access_Subprogram_Instance is
10380 if not Is_Access_Type (Act_T)
10381 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
10384 ("expect access type in instantiation of &", Actual, Gen_T);
10385 Abandon_Instantiation (Actual);
10388 Check_Mode_Conformant
10389 (Designated_Type (Act_T),
10390 Designated_Type (A_Gen_T),
10394 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
10395 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
10397 ("protected access type not allowed for formal &",
10401 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
10403 ("expect protected access type for formal &",
10406 end Validate_Access_Subprogram_Instance;
10408 -----------------------------------
10409 -- Validate_Access_Type_Instance --
10410 -----------------------------------
10412 procedure Validate_Access_Type_Instance is
10413 Desig_Type : constant Entity_Id :=
10414 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
10415 Desig_Act : Entity_Id;
10418 if not Is_Access_Type (Act_T) then
10420 ("expect access type in instantiation of &", Actual, Gen_T);
10421 Abandon_Instantiation (Actual);
10424 if Is_Access_Constant (A_Gen_T) then
10425 if not Is_Access_Constant (Act_T) then
10427 ("actual type must be access-to-constant type", Actual);
10428 Abandon_Instantiation (Actual);
10431 if Is_Access_Constant (Act_T) then
10433 ("actual type must be access-to-variable type", Actual);
10434 Abandon_Instantiation (Actual);
10436 elsif Ekind (A_Gen_T) = E_General_Access_Type
10437 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
10439 Error_Msg_N -- CODEFIX
10440 ("actual must be general access type!", Actual);
10441 Error_Msg_NE -- CODEFIX
10442 ("add ALL to }!", Actual, Act_T);
10443 Abandon_Instantiation (Actual);
10447 -- The designated subtypes, that is to say the subtypes introduced
10448 -- by an access type declaration (and not by a subtype declaration)
10451 Desig_Act := Designated_Type (Base_Type (Act_T));
10453 -- The designated type may have been introduced through a limited_
10454 -- with clause, in which case retrieve the non-limited view. This
10455 -- applies to incomplete types as well as to class-wide types.
10457 if From_With_Type (Desig_Act) then
10458 Desig_Act := Available_View (Desig_Act);
10461 if not Subtypes_Match
10462 (Desig_Type, Desig_Act) then
10464 ("designated type of actual does not match that of formal &",
10466 Abandon_Instantiation (Actual);
10468 elsif Is_Access_Type (Designated_Type (Act_T))
10469 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
10471 Is_Constrained (Designated_Type (Desig_Type))
10474 ("designated type of actual does not match that of formal &",
10476 Abandon_Instantiation (Actual);
10479 -- Ada 2005: null-exclusion indicators of the two types must agree
10481 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
10483 ("non null exclusion of actual and formal & do not match",
10486 end Validate_Access_Type_Instance;
10488 ----------------------------------
10489 -- Validate_Array_Type_Instance --
10490 ----------------------------------
10492 procedure Validate_Array_Type_Instance is
10497 function Formal_Dimensions return Int;
10498 -- Count number of dimensions in array type formal
10500 -----------------------
10501 -- Formal_Dimensions --
10502 -----------------------
10504 function Formal_Dimensions return Int is
10509 if Nkind (Def) = N_Constrained_Array_Definition then
10510 Index := First (Discrete_Subtype_Definitions (Def));
10512 Index := First (Subtype_Marks (Def));
10515 while Present (Index) loop
10517 Next_Index (Index);
10521 end Formal_Dimensions;
10523 -- Start of processing for Validate_Array_Type_Instance
10526 if not Is_Array_Type (Act_T) then
10528 ("expect array type in instantiation of &", Actual, Gen_T);
10529 Abandon_Instantiation (Actual);
10531 elsif Nkind (Def) = N_Constrained_Array_Definition then
10532 if not (Is_Constrained (Act_T)) then
10534 ("expect constrained array in instantiation of &",
10536 Abandon_Instantiation (Actual);
10540 if Is_Constrained (Act_T) then
10542 ("expect unconstrained array in instantiation of &",
10544 Abandon_Instantiation (Actual);
10548 if Formal_Dimensions /= Number_Dimensions (Act_T) then
10550 ("dimensions of actual do not match formal &", Actual, Gen_T);
10551 Abandon_Instantiation (Actual);
10554 I1 := First_Index (A_Gen_T);
10555 I2 := First_Index (Act_T);
10556 for J in 1 .. Formal_Dimensions loop
10558 -- If the indexes of the actual were given by a subtype_mark,
10559 -- the index was transformed into a range attribute. Retrieve
10560 -- the original type mark for checking.
10562 if Is_Entity_Name (Original_Node (I2)) then
10563 T2 := Entity (Original_Node (I2));
10568 if not Subtypes_Match
10569 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
10572 ("index types of actual do not match those of formal &",
10574 Abandon_Instantiation (Actual);
10581 -- Check matching subtypes. Note that there are complex visibility
10582 -- issues when the generic is a child unit and some aspect of the
10583 -- generic type is declared in a parent unit of the generic. We do
10584 -- the test to handle this special case only after a direct check
10585 -- for static matching has failed.
10588 (Component_Type (A_Gen_T), Component_Type (Act_T))
10589 or else Subtypes_Match
10590 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
10591 Component_Type (Act_T))
10596 ("component subtype of actual does not match that of formal &",
10598 Abandon_Instantiation (Actual);
10601 if Has_Aliased_Components (A_Gen_T)
10602 and then not Has_Aliased_Components (Act_T)
10605 ("actual must have aliased components to match formal type &",
10608 end Validate_Array_Type_Instance;
10610 -----------------------------------------------
10611 -- Validate_Derived_Interface_Type_Instance --
10612 -----------------------------------------------
10614 procedure Validate_Derived_Interface_Type_Instance is
10615 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
10619 -- First apply interface instance checks
10621 Validate_Interface_Type_Instance;
10623 -- Verify that immediate parent interface is an ancestor of
10627 and then not Interface_Present_In_Ancestor (Act_T, Par)
10630 ("interface actual must include progenitor&", Actual, Par);
10633 -- Now verify that the actual includes all other ancestors of
10636 Elmt := First_Elmt (Interfaces (A_Gen_T));
10637 while Present (Elmt) loop
10638 if not Interface_Present_In_Ancestor
10639 (Act_T, Get_Instance_Of (Node (Elmt)))
10642 ("interface actual must include progenitor&",
10643 Actual, Node (Elmt));
10648 end Validate_Derived_Interface_Type_Instance;
10650 ------------------------------------
10651 -- Validate_Derived_Type_Instance --
10652 ------------------------------------
10654 procedure Validate_Derived_Type_Instance is
10655 Actual_Discr : Entity_Id;
10656 Ancestor_Discr : Entity_Id;
10659 -- If the parent type in the generic declaration is itself a previous
10660 -- formal type, then it is local to the generic and absent from the
10661 -- analyzed generic definition. In that case the ancestor is the
10662 -- instance of the formal (which must have been instantiated
10663 -- previously), unless the ancestor is itself a formal derived type.
10664 -- In this latter case (which is the subject of Corrigendum 8652/0038
10665 -- (AI-202) the ancestor of the formals is the ancestor of its
10666 -- parent. Otherwise, the analyzed generic carries the parent type.
10667 -- If the parent type is defined in a previous formal package, then
10668 -- the scope of that formal package is that of the generic type
10669 -- itself, and it has already been mapped into the corresponding type
10670 -- in the actual package.
10672 -- Common case: parent type defined outside of the generic
10674 if Is_Entity_Name (Subtype_Mark (Def))
10675 and then Present (Entity (Subtype_Mark (Def)))
10677 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
10679 -- Check whether parent is defined in a previous formal package
10682 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
10685 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
10687 -- The type may be a local derivation, or a type extension of a
10688 -- previous formal, or of a formal of a parent package.
10690 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
10692 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
10694 -- Check whether the parent is another derived formal type in the
10695 -- same generic unit.
10697 if Etype (A_Gen_T) /= A_Gen_T
10698 and then Is_Generic_Type (Etype (A_Gen_T))
10699 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
10700 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
10702 -- Locate ancestor of parent from the subtype declaration
10703 -- created for the actual.
10709 Decl := First (Actual_Decls);
10710 while Present (Decl) loop
10711 if Nkind (Decl) = N_Subtype_Declaration
10712 and then Chars (Defining_Identifier (Decl)) =
10713 Chars (Etype (A_Gen_T))
10715 Ancestor := Generic_Parent_Type (Decl);
10723 pragma Assert (Present (Ancestor));
10727 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
10731 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
10734 -- If the formal derived type has pragma Preelaborable_Initialization
10735 -- then the actual type must have preelaborable initialization.
10737 if Known_To_Have_Preelab_Init (A_Gen_T)
10738 and then not Has_Preelaborable_Initialization (Act_T)
10741 ("actual for & must have preelaborable initialization",
10745 -- Ada 2005 (AI-251)
10747 if Ada_Version >= Ada_2005
10748 and then Is_Interface (Ancestor)
10750 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
10752 ("(Ada 2005) expected type implementing & in instantiation",
10756 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
10758 ("expect type derived from & in instantiation",
10759 Actual, First_Subtype (Ancestor));
10760 Abandon_Instantiation (Actual);
10763 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10764 -- that the formal type declaration has been rewritten as a private
10767 if Ada_Version >= Ada_2005
10768 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
10769 and then Synchronized_Present (Parent (A_Gen_T))
10771 -- The actual must be a synchronized tagged type
10773 if not Is_Tagged_Type (Act_T) then
10775 ("actual of synchronized type must be tagged", Actual);
10776 Abandon_Instantiation (Actual);
10778 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
10779 and then Nkind (Type_Definition (Parent (Act_T))) =
10780 N_Derived_Type_Definition
10781 and then not Synchronized_Present (Type_Definition
10785 ("actual of synchronized type must be synchronized", Actual);
10786 Abandon_Instantiation (Actual);
10790 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
10791 -- removes the second instance of the phrase "or allow pass by copy".
10793 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
10795 ("cannot have atomic actual type for non-atomic formal type",
10798 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
10800 ("cannot have volatile actual type for non-volatile formal type",
10804 -- It should not be necessary to check for unknown discriminants on
10805 -- Formal, but for some reason Has_Unknown_Discriminants is false for
10806 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
10807 -- needs fixing. ???
10809 if not Is_Indefinite_Subtype (A_Gen_T)
10810 and then not Unknown_Discriminants_Present (Formal)
10811 and then Is_Indefinite_Subtype (Act_T)
10814 ("actual subtype must be constrained", Actual);
10815 Abandon_Instantiation (Actual);
10818 if not Unknown_Discriminants_Present (Formal) then
10819 if Is_Constrained (Ancestor) then
10820 if not Is_Constrained (Act_T) then
10822 ("actual subtype must be constrained", Actual);
10823 Abandon_Instantiation (Actual);
10826 -- Ancestor is unconstrained, Check if generic formal and actual
10827 -- agree on constrainedness. The check only applies to array types
10828 -- and discriminated types.
10830 elsif Is_Constrained (Act_T) then
10831 if Ekind (Ancestor) = E_Access_Type
10833 (not Is_Constrained (A_Gen_T)
10834 and then Is_Composite_Type (A_Gen_T))
10837 ("actual subtype must be unconstrained", Actual);
10838 Abandon_Instantiation (Actual);
10841 -- A class-wide type is only allowed if the formal has unknown
10844 elsif Is_Class_Wide_Type (Act_T)
10845 and then not Has_Unknown_Discriminants (Ancestor)
10848 ("actual for & cannot be a class-wide type", Actual, Gen_T);
10849 Abandon_Instantiation (Actual);
10851 -- Otherwise, the formal and actual shall have the same number
10852 -- of discriminants and each discriminant of the actual must
10853 -- correspond to a discriminant of the formal.
10855 elsif Has_Discriminants (Act_T)
10856 and then not Has_Unknown_Discriminants (Act_T)
10857 and then Has_Discriminants (Ancestor)
10859 Actual_Discr := First_Discriminant (Act_T);
10860 Ancestor_Discr := First_Discriminant (Ancestor);
10861 while Present (Actual_Discr)
10862 and then Present (Ancestor_Discr)
10864 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
10865 No (Corresponding_Discriminant (Actual_Discr))
10868 ("discriminant & does not correspond " &
10869 "to ancestor discriminant", Actual, Actual_Discr);
10870 Abandon_Instantiation (Actual);
10873 Next_Discriminant (Actual_Discr);
10874 Next_Discriminant (Ancestor_Discr);
10877 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
10879 ("actual for & must have same number of discriminants",
10881 Abandon_Instantiation (Actual);
10884 -- This case should be caught by the earlier check for
10885 -- constrainedness, but the check here is added for completeness.
10887 elsif Has_Discriminants (Act_T)
10888 and then not Has_Unknown_Discriminants (Act_T)
10891 ("actual for & must not have discriminants", Actual, Gen_T);
10892 Abandon_Instantiation (Actual);
10894 elsif Has_Discriminants (Ancestor) then
10896 ("actual for & must have known discriminants", Actual, Gen_T);
10897 Abandon_Instantiation (Actual);
10900 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
10902 ("constraint on actual is incompatible with formal", Actual);
10903 Abandon_Instantiation (Actual);
10907 -- If the formal and actual types are abstract, check that there
10908 -- are no abstract primitives of the actual type that correspond to
10909 -- nonabstract primitives of the formal type (second sentence of
10912 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
10913 Check_Abstract_Primitives : declare
10914 Gen_Prims : constant Elist_Id :=
10915 Primitive_Operations (A_Gen_T);
10916 Gen_Elmt : Elmt_Id;
10917 Gen_Subp : Entity_Id;
10918 Anc_Subp : Entity_Id;
10919 Anc_Formal : Entity_Id;
10920 Anc_F_Type : Entity_Id;
10922 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
10923 Act_Elmt : Elmt_Id;
10924 Act_Subp : Entity_Id;
10925 Act_Formal : Entity_Id;
10926 Act_F_Type : Entity_Id;
10928 Subprograms_Correspond : Boolean;
10930 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
10931 -- Returns true if T2 is derived directly or indirectly from
10932 -- T1, including derivations from interfaces. T1 and T2 are
10933 -- required to be specific tagged base types.
10935 ------------------------
10936 -- Is_Tagged_Ancestor --
10937 ------------------------
10939 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
10941 Intfc_Elmt : Elmt_Id;
10944 -- The predicate is satisfied if the types are the same
10949 -- If we've reached the top of the derivation chain then
10950 -- we know that T1 is not an ancestor of T2.
10952 elsif Etype (T2) = T2 then
10955 -- Proceed to check T2's immediate parent
10957 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
10960 -- Finally, check to see if T1 is an ancestor of any of T2's
10964 Intfc_Elmt := First_Elmt (Interfaces (T2));
10965 while Present (Intfc_Elmt) loop
10966 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
10970 Next_Elmt (Intfc_Elmt);
10975 end Is_Tagged_Ancestor;
10977 -- Start of processing for Check_Abstract_Primitives
10980 -- Loop over all of the formal derived type's primitives
10982 Gen_Elmt := First_Elmt (Gen_Prims);
10983 while Present (Gen_Elmt) loop
10984 Gen_Subp := Node (Gen_Elmt);
10986 -- If the primitive of the formal is not abstract, then
10987 -- determine whether there is a corresponding primitive of
10988 -- the actual type that's abstract.
10990 if not Is_Abstract_Subprogram (Gen_Subp) then
10991 Act_Elmt := First_Elmt (Act_Prims);
10992 while Present (Act_Elmt) loop
10993 Act_Subp := Node (Act_Elmt);
10995 -- If we find an abstract primitive of the actual,
10996 -- then we need to test whether it corresponds to the
10997 -- subprogram from which the generic formal primitive
11000 if Is_Abstract_Subprogram (Act_Subp) then
11001 Anc_Subp := Alias (Gen_Subp);
11003 -- Test whether we have a corresponding primitive
11004 -- by comparing names, kinds, formal types, and
11007 if Chars (Anc_Subp) = Chars (Act_Subp)
11008 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
11010 Anc_Formal := First_Formal (Anc_Subp);
11011 Act_Formal := First_Formal (Act_Subp);
11012 while Present (Anc_Formal)
11013 and then Present (Act_Formal)
11015 Anc_F_Type := Etype (Anc_Formal);
11016 Act_F_Type := Etype (Act_Formal);
11018 if Ekind (Anc_F_Type)
11019 = E_Anonymous_Access_Type
11021 Anc_F_Type := Designated_Type (Anc_F_Type);
11023 if Ekind (Act_F_Type)
11024 = E_Anonymous_Access_Type
11027 Designated_Type (Act_F_Type);
11033 Ekind (Act_F_Type) = E_Anonymous_Access_Type
11038 Anc_F_Type := Base_Type (Anc_F_Type);
11039 Act_F_Type := Base_Type (Act_F_Type);
11041 -- If the formal is controlling, then the
11042 -- the type of the actual primitive's formal
11043 -- must be derived directly or indirectly
11044 -- from the type of the ancestor primitive's
11047 if Is_Controlling_Formal (Anc_Formal) then
11048 if not Is_Tagged_Ancestor
11049 (Anc_F_Type, Act_F_Type)
11054 -- Otherwise the types of the formals must
11057 elsif Anc_F_Type /= Act_F_Type then
11061 Next_Entity (Anc_Formal);
11062 Next_Entity (Act_Formal);
11065 -- If we traversed through all of the formals
11066 -- then so far the subprograms correspond, so
11067 -- now check that any result types correspond.
11069 if No (Anc_Formal) and then No (Act_Formal) then
11070 Subprograms_Correspond := True;
11072 if Ekind (Act_Subp) = E_Function then
11073 Anc_F_Type := Etype (Anc_Subp);
11074 Act_F_Type := Etype (Act_Subp);
11076 if Ekind (Anc_F_Type)
11077 = E_Anonymous_Access_Type
11080 Designated_Type (Anc_F_Type);
11082 if Ekind (Act_F_Type)
11083 = E_Anonymous_Access_Type
11086 Designated_Type (Act_F_Type);
11088 Subprograms_Correspond := False;
11093 = E_Anonymous_Access_Type
11095 Subprograms_Correspond := False;
11098 Anc_F_Type := Base_Type (Anc_F_Type);
11099 Act_F_Type := Base_Type (Act_F_Type);
11101 -- Now either the result types must be
11102 -- the same or, if the result type is
11103 -- controlling, the result type of the
11104 -- actual primitive must descend from the
11105 -- result type of the ancestor primitive.
11107 if Subprograms_Correspond
11108 and then Anc_F_Type /= Act_F_Type
11110 Has_Controlling_Result (Anc_Subp)
11112 not Is_Tagged_Ancestor
11113 (Anc_F_Type, Act_F_Type)
11115 Subprograms_Correspond := False;
11119 -- Found a matching subprogram belonging to
11120 -- formal ancestor type, so actual subprogram
11121 -- corresponds and this violates 3.9.3(9).
11123 if Subprograms_Correspond then
11125 ("abstract subprogram & overrides " &
11126 "nonabstract subprogram of ancestor",
11134 Next_Elmt (Act_Elmt);
11138 Next_Elmt (Gen_Elmt);
11140 end Check_Abstract_Primitives;
11143 -- Verify that limitedness matches. If parent is a limited
11144 -- interface then the generic formal is not unless declared
11145 -- explicitly so. If not declared limited, the actual cannot be
11146 -- limited (see AI05-0087).
11148 -- Even though this AI is a binding interpretation, we enable the
11149 -- check only in Ada 2012 mode, because this improper construct
11150 -- shows up in user code and in existing B-tests.
11152 if Is_Limited_Type (Act_T)
11153 and then not Is_Limited_Type (A_Gen_T)
11154 and then Ada_Version >= Ada_2012
11156 if In_Instance then
11160 ("actual for non-limited & cannot be a limited type", Actual,
11162 Explain_Limited_Type (Act_T, Actual);
11163 Abandon_Instantiation (Actual);
11166 end Validate_Derived_Type_Instance;
11168 ----------------------------------------
11169 -- Validate_Discriminated_Formal_Type --
11170 ----------------------------------------
11172 procedure Validate_Discriminated_Formal_Type is
11173 Formal_Discr : Entity_Id;
11174 Actual_Discr : Entity_Id;
11175 Formal_Subt : Entity_Id;
11178 if Has_Discriminants (A_Gen_T) then
11179 if not Has_Discriminants (Act_T) then
11181 ("actual for & must have discriminants", Actual, Gen_T);
11182 Abandon_Instantiation (Actual);
11184 elsif Is_Constrained (Act_T) then
11186 ("actual for & must be unconstrained", Actual, Gen_T);
11187 Abandon_Instantiation (Actual);
11190 Formal_Discr := First_Discriminant (A_Gen_T);
11191 Actual_Discr := First_Discriminant (Act_T);
11192 while Formal_Discr /= Empty loop
11193 if Actual_Discr = Empty then
11195 ("discriminants on actual do not match formal",
11197 Abandon_Instantiation (Actual);
11200 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
11202 -- Access discriminants match if designated types do
11204 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
11205 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
11206 E_Anonymous_Access_Type
11209 (Designated_Type (Base_Type (Formal_Subt))) =
11210 Designated_Type (Base_Type (Etype (Actual_Discr)))
11214 elsif Base_Type (Formal_Subt) /=
11215 Base_Type (Etype (Actual_Discr))
11218 ("types of actual discriminants must match formal",
11220 Abandon_Instantiation (Actual);
11222 elsif not Subtypes_Statically_Match
11223 (Formal_Subt, Etype (Actual_Discr))
11224 and then Ada_Version >= Ada_95
11227 ("subtypes of actual discriminants must match formal",
11229 Abandon_Instantiation (Actual);
11232 Next_Discriminant (Formal_Discr);
11233 Next_Discriminant (Actual_Discr);
11236 if Actual_Discr /= Empty then
11238 ("discriminants on actual do not match formal",
11240 Abandon_Instantiation (Actual);
11244 end Validate_Discriminated_Formal_Type;
11246 ---------------------------------------
11247 -- Validate_Incomplete_Type_Instance --
11248 ---------------------------------------
11250 procedure Validate_Incomplete_Type_Instance is
11252 if not Is_Tagged_Type (Act_T)
11253 and then Is_Tagged_Type (A_Gen_T)
11256 ("actual for & must be a tagged type", Actual, Gen_T);
11259 Validate_Discriminated_Formal_Type;
11260 end Validate_Incomplete_Type_Instance;
11262 --------------------------------------
11263 -- Validate_Interface_Type_Instance --
11264 --------------------------------------
11266 procedure Validate_Interface_Type_Instance is
11268 if not Is_Interface (Act_T) then
11270 ("actual for formal interface type must be an interface",
11273 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
11275 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
11277 Is_Protected_Interface (A_Gen_T) /=
11278 Is_Protected_Interface (Act_T)
11280 Is_Synchronized_Interface (A_Gen_T) /=
11281 Is_Synchronized_Interface (Act_T)
11284 ("actual for interface& does not match (RM 12.5.5(4))",
11287 end Validate_Interface_Type_Instance;
11289 ------------------------------------
11290 -- Validate_Private_Type_Instance --
11291 ------------------------------------
11293 procedure Validate_Private_Type_Instance is
11295 if Is_Limited_Type (Act_T)
11296 and then not Is_Limited_Type (A_Gen_T)
11298 if In_Instance then
11302 ("actual for non-limited & cannot be a limited type", Actual,
11304 Explain_Limited_Type (Act_T, Actual);
11305 Abandon_Instantiation (Actual);
11308 elsif Known_To_Have_Preelab_Init (A_Gen_T)
11309 and then not Has_Preelaborable_Initialization (Act_T)
11312 ("actual for & must have preelaborable initialization", Actual,
11315 elsif Is_Indefinite_Subtype (Act_T)
11316 and then not Is_Indefinite_Subtype (A_Gen_T)
11317 and then Ada_Version >= Ada_95
11320 ("actual for & must be a definite subtype", Actual, Gen_T);
11322 elsif not Is_Tagged_Type (Act_T)
11323 and then Is_Tagged_Type (A_Gen_T)
11326 ("actual for & must be a tagged type", Actual, Gen_T);
11329 Validate_Discriminated_Formal_Type;
11331 end Validate_Private_Type_Instance;
11333 -- Start of processing for Instantiate_Type
11336 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
11337 Error_Msg_N ("duplicate instantiation of generic type", Actual);
11338 return New_List (Error);
11340 elsif not Is_Entity_Name (Actual)
11341 or else not Is_Type (Entity (Actual))
11344 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
11345 Abandon_Instantiation (Actual);
11348 Act_T := Entity (Actual);
11350 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
11351 -- as a generic actual parameter if the corresponding formal type
11352 -- does not have a known_discriminant_part, or is a formal derived
11353 -- type that is an Unchecked_Union type.
11355 if Is_Unchecked_Union (Base_Type (Act_T)) then
11356 if not Has_Discriminants (A_Gen_T)
11358 (Is_Derived_Type (A_Gen_T)
11360 Is_Unchecked_Union (A_Gen_T))
11364 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
11365 " discriminated formal type", Act_T);
11370 -- Deal with fixed/floating restrictions
11372 if Is_Floating_Point_Type (Act_T) then
11373 Check_Restriction (No_Floating_Point, Actual);
11374 elsif Is_Fixed_Point_Type (Act_T) then
11375 Check_Restriction (No_Fixed_Point, Actual);
11378 -- Deal with error of using incomplete type as generic actual.
11379 -- This includes limited views of a type, even if the non-limited
11380 -- view may be available.
11382 if Ekind (Act_T) = E_Incomplete_Type
11383 or else (Is_Class_Wide_Type (Act_T)
11385 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
11387 -- If the formal is an incomplete type, the actual can be
11388 -- incomplete as well.
11390 if Ekind (A_Gen_T) = E_Incomplete_Type then
11393 elsif Is_Class_Wide_Type (Act_T)
11394 or else No (Full_View (Act_T))
11396 Error_Msg_N ("premature use of incomplete type", Actual);
11397 Abandon_Instantiation (Actual);
11399 Act_T := Full_View (Act_T);
11400 Set_Entity (Actual, Act_T);
11402 if Has_Private_Component (Act_T) then
11404 ("premature use of type with private component", Actual);
11408 -- Deal with error of premature use of private type as generic actual
11410 elsif Is_Private_Type (Act_T)
11411 and then Is_Private_Type (Base_Type (Act_T))
11412 and then not Is_Generic_Type (Act_T)
11413 and then not Is_Derived_Type (Act_T)
11414 and then No (Full_View (Root_Type (Act_T)))
11416 -- If the formal is an incomplete type, the actual can be
11417 -- private or incomplete as well.
11419 if Ekind (A_Gen_T) = E_Incomplete_Type then
11422 Error_Msg_N ("premature use of private type", Actual);
11425 elsif Has_Private_Component (Act_T) then
11427 ("premature use of type with private component", Actual);
11430 Set_Instance_Of (A_Gen_T, Act_T);
11432 -- If the type is generic, the class-wide type may also be used
11434 if Is_Tagged_Type (A_Gen_T)
11435 and then Is_Tagged_Type (Act_T)
11436 and then not Is_Class_Wide_Type (A_Gen_T)
11438 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
11439 Class_Wide_Type (Act_T));
11442 if not Is_Abstract_Type (A_Gen_T)
11443 and then Is_Abstract_Type (Act_T)
11446 ("actual of non-abstract formal cannot be abstract", Actual);
11449 -- A generic scalar type is a first subtype for which we generate
11450 -- an anonymous base type. Indicate that the instance of this base
11451 -- is the base type of the actual.
11453 if Is_Scalar_Type (A_Gen_T) then
11454 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
11458 if Error_Posted (Act_T) then
11461 case Nkind (Def) is
11462 when N_Formal_Private_Type_Definition =>
11463 Validate_Private_Type_Instance;
11465 when N_Formal_Incomplete_Type_Definition =>
11466 Validate_Incomplete_Type_Instance;
11468 when N_Formal_Derived_Type_Definition =>
11469 Validate_Derived_Type_Instance;
11471 when N_Formal_Discrete_Type_Definition =>
11472 if not Is_Discrete_Type (Act_T) then
11474 ("expect discrete type in instantiation of&",
11476 Abandon_Instantiation (Actual);
11479 when N_Formal_Signed_Integer_Type_Definition =>
11480 if not Is_Signed_Integer_Type (Act_T) then
11482 ("expect signed integer type in instantiation of&",
11484 Abandon_Instantiation (Actual);
11487 when N_Formal_Modular_Type_Definition =>
11488 if not Is_Modular_Integer_Type (Act_T) then
11490 ("expect modular type in instantiation of &",
11492 Abandon_Instantiation (Actual);
11495 when N_Formal_Floating_Point_Definition =>
11496 if not Is_Floating_Point_Type (Act_T) then
11498 ("expect float type in instantiation of &", Actual, Gen_T);
11499 Abandon_Instantiation (Actual);
11502 when N_Formal_Ordinary_Fixed_Point_Definition =>
11503 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
11505 ("expect ordinary fixed point type in instantiation of &",
11507 Abandon_Instantiation (Actual);
11510 when N_Formal_Decimal_Fixed_Point_Definition =>
11511 if not Is_Decimal_Fixed_Point_Type (Act_T) then
11513 ("expect decimal type in instantiation of &",
11515 Abandon_Instantiation (Actual);
11518 when N_Array_Type_Definition =>
11519 Validate_Array_Type_Instance;
11521 when N_Access_To_Object_Definition =>
11522 Validate_Access_Type_Instance;
11524 when N_Access_Function_Definition |
11525 N_Access_Procedure_Definition =>
11526 Validate_Access_Subprogram_Instance;
11528 when N_Record_Definition =>
11529 Validate_Interface_Type_Instance;
11531 when N_Derived_Type_Definition =>
11532 Validate_Derived_Interface_Type_Instance;
11535 raise Program_Error;
11540 Subt := New_Copy (Gen_T);
11542 -- Use adjusted sloc of subtype name as the location for other nodes in
11543 -- the subtype declaration.
11545 Loc := Sloc (Subt);
11548 Make_Subtype_Declaration (Loc,
11549 Defining_Identifier => Subt,
11550 Subtype_Indication => New_Reference_To (Act_T, Loc));
11552 if Is_Private_Type (Act_T) then
11553 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11555 elsif Is_Access_Type (Act_T)
11556 and then Is_Private_Type (Designated_Type (Act_T))
11558 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11561 Decl_Nodes := New_List (Decl_Node);
11563 -- Flag actual derived types so their elaboration produces the
11564 -- appropriate renamings for the primitive operations of the ancestor.
11565 -- Flag actual for formal private types as well, to determine whether
11566 -- operations in the private part may override inherited operations.
11567 -- If the formal has an interface list, the ancestor is not the
11568 -- parent, but the analyzed formal that includes the interface
11569 -- operations of all its progenitors.
11571 -- Same treatment for formal private types, so we can check whether the
11572 -- type is tagged limited when validating derivations in the private
11573 -- part. (See AI05-096).
11575 if Nkind (Def) = N_Formal_Derived_Type_Definition then
11576 if Present (Interface_List (Def)) then
11577 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11579 Set_Generic_Parent_Type (Decl_Node, Ancestor);
11582 elsif Nkind_In (Def,
11583 N_Formal_Private_Type_Definition,
11584 N_Formal_Incomplete_Type_Definition)
11586 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11589 -- If the actual is a synchronized type that implements an interface,
11590 -- the primitive operations are attached to the corresponding record,
11591 -- and we have to treat it as an additional generic actual, so that its
11592 -- primitive operations become visible in the instance. The task or
11593 -- protected type itself does not carry primitive operations.
11595 if Is_Concurrent_Type (Act_T)
11596 and then Is_Tagged_Type (Act_T)
11597 and then Present (Corresponding_Record_Type (Act_T))
11598 and then Present (Ancestor)
11599 and then Is_Interface (Ancestor)
11602 Corr_Rec : constant Entity_Id :=
11603 Corresponding_Record_Type (Act_T);
11604 New_Corr : Entity_Id;
11605 Corr_Decl : Node_Id;
11608 New_Corr := Make_Temporary (Loc, 'S');
11610 Make_Subtype_Declaration (Loc,
11611 Defining_Identifier => New_Corr,
11612 Subtype_Indication =>
11613 New_Reference_To (Corr_Rec, Loc));
11614 Append_To (Decl_Nodes, Corr_Decl);
11616 if Ekind (Act_T) = E_Task_Type then
11617 Set_Ekind (Subt, E_Task_Subtype);
11619 Set_Ekind (Subt, E_Protected_Subtype);
11622 Set_Corresponding_Record_Type (Subt, Corr_Rec);
11623 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
11624 Set_Generic_Parent_Type (Decl_Node, Empty);
11629 end Instantiate_Type;
11631 ---------------------
11632 -- Is_In_Main_Unit --
11633 ---------------------
11635 function Is_In_Main_Unit (N : Node_Id) return Boolean is
11636 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
11637 Current_Unit : Node_Id;
11640 if Unum = Main_Unit then
11643 -- If the current unit is a subunit then it is either the main unit or
11644 -- is being compiled as part of the main unit.
11646 elsif Nkind (N) = N_Compilation_Unit then
11647 return Nkind (Unit (N)) = N_Subunit;
11650 Current_Unit := Parent (N);
11651 while Present (Current_Unit)
11652 and then Nkind (Current_Unit) /= N_Compilation_Unit
11654 Current_Unit := Parent (Current_Unit);
11657 -- The instantiation node is in the main unit, or else the current node
11658 -- (perhaps as the result of nested instantiations) is in the main unit,
11659 -- or in the declaration of the main unit, which in this last case must
11662 return Unum = Main_Unit
11663 or else Current_Unit = Cunit (Main_Unit)
11664 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
11665 or else (Present (Library_Unit (Current_Unit))
11666 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
11667 end Is_In_Main_Unit;
11669 ----------------------------
11670 -- Load_Parent_Of_Generic --
11671 ----------------------------
11673 procedure Load_Parent_Of_Generic
11676 Body_Optional : Boolean := False)
11678 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
11679 Save_Style_Check : constant Boolean := Style_Check;
11680 True_Parent : Node_Id;
11681 Inst_Node : Node_Id;
11683 Previous_Instances : constant Elist_Id := New_Elmt_List;
11685 procedure Collect_Previous_Instances (Decls : List_Id);
11686 -- Collect all instantiations in the given list of declarations, that
11687 -- precede the generic that we need to load. If the bodies of these
11688 -- instantiations are available, we must analyze them, to ensure that
11689 -- the public symbols generated are the same when the unit is compiled
11690 -- to generate code, and when it is compiled in the context of a unit
11691 -- that needs a particular nested instance. This process is applied to
11692 -- both package and subprogram instances.
11694 --------------------------------
11695 -- Collect_Previous_Instances --
11696 --------------------------------
11698 procedure Collect_Previous_Instances (Decls : List_Id) is
11702 Decl := First (Decls);
11703 while Present (Decl) loop
11704 if Sloc (Decl) >= Sloc (Inst_Node) then
11707 -- If Decl is an instantiation, then record it as requiring
11708 -- instantiation of the corresponding body, except if it is an
11709 -- abbreviated instantiation generated internally for conformance
11710 -- checking purposes only for the case of a formal package
11711 -- declared without a box (see Instantiate_Formal_Package). Such
11712 -- an instantiation does not generate any code (the actual code
11713 -- comes from actual) and thus does not need to be analyzed here.
11714 -- If the instantiation appears with a generic package body it is
11715 -- not analyzed here either.
11717 elsif Nkind (Decl) = N_Package_Instantiation
11718 and then not Is_Internal (Defining_Entity (Decl))
11720 Append_Elmt (Decl, Previous_Instances);
11722 -- For a subprogram instantiation, omit instantiations intrinsic
11723 -- operations (Unchecked_Conversions, etc.) that have no bodies.
11725 elsif Nkind_In (Decl, N_Function_Instantiation,
11726 N_Procedure_Instantiation)
11727 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
11729 Append_Elmt (Decl, Previous_Instances);
11731 elsif Nkind (Decl) = N_Package_Declaration then
11732 Collect_Previous_Instances
11733 (Visible_Declarations (Specification (Decl)));
11734 Collect_Previous_Instances
11735 (Private_Declarations (Specification (Decl)));
11737 -- Previous non-generic bodies may contain instances as well
11739 elsif Nkind (Decl) = N_Package_Body
11740 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
11742 Collect_Previous_Instances (Declarations (Decl));
11744 elsif Nkind (Decl) = N_Subprogram_Body
11745 and then not Acts_As_Spec (Decl)
11746 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
11748 Collect_Previous_Instances (Declarations (Decl));
11753 end Collect_Previous_Instances;
11755 -- Start of processing for Load_Parent_Of_Generic
11758 if not In_Same_Source_Unit (N, Spec)
11759 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
11760 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
11761 and then not Is_In_Main_Unit (Spec))
11763 -- Find body of parent of spec, and analyze it. A special case arises
11764 -- when the parent is an instantiation, that is to say when we are
11765 -- currently instantiating a nested generic. In that case, there is
11766 -- no separate file for the body of the enclosing instance. Instead,
11767 -- the enclosing body must be instantiated as if it were a pending
11768 -- instantiation, in order to produce the body for the nested generic
11769 -- we require now. Note that in that case the generic may be defined
11770 -- in a package body, the instance defined in the same package body,
11771 -- and the original enclosing body may not be in the main unit.
11773 Inst_Node := Empty;
11775 True_Parent := Parent (Spec);
11776 while Present (True_Parent)
11777 and then Nkind (True_Parent) /= N_Compilation_Unit
11779 if Nkind (True_Parent) = N_Package_Declaration
11781 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
11783 -- Parent is a compilation unit that is an instantiation.
11784 -- Instantiation node has been replaced with package decl.
11786 Inst_Node := Original_Node (True_Parent);
11789 elsif Nkind (True_Parent) = N_Package_Declaration
11790 and then Present (Generic_Parent (Specification (True_Parent)))
11791 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11793 -- Parent is an instantiation within another specification.
11794 -- Declaration for instance has been inserted before original
11795 -- instantiation node. A direct link would be preferable?
11797 Inst_Node := Next (True_Parent);
11798 while Present (Inst_Node)
11799 and then Nkind (Inst_Node) /= N_Package_Instantiation
11804 -- If the instance appears within a generic, and the generic
11805 -- unit is defined within a formal package of the enclosing
11806 -- generic, there is no generic body available, and none
11807 -- needed. A more precise test should be used ???
11809 if No (Inst_Node) then
11816 True_Parent := Parent (True_Parent);
11820 -- Case where we are currently instantiating a nested generic
11822 if Present (Inst_Node) then
11823 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
11825 -- Instantiation node and declaration of instantiated package
11826 -- were exchanged when only the declaration was needed.
11827 -- Restore instantiation node before proceeding with body.
11829 Set_Unit (Parent (True_Parent), Inst_Node);
11832 -- Now complete instantiation of enclosing body, if it appears in
11833 -- some other unit. If it appears in the current unit, the body
11834 -- will have been instantiated already.
11836 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
11838 -- We need to determine the expander mode to instantiate the
11839 -- enclosing body. Because the generic body we need may use
11840 -- global entities declared in the enclosing package (including
11841 -- aggregates) it is in general necessary to compile this body
11842 -- with expansion enabled, except if we are within a generic
11843 -- package, in which case the usual generic rule applies.
11846 Exp_Status : Boolean := True;
11850 -- Loop through scopes looking for generic package
11852 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
11853 while Present (Scop)
11854 and then Scop /= Standard_Standard
11856 if Ekind (Scop) = E_Generic_Package then
11857 Exp_Status := False;
11861 Scop := Scope (Scop);
11864 -- Collect previous instantiations in the unit that contains
11865 -- the desired generic.
11867 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11868 and then not Body_Optional
11872 Info : Pending_Body_Info;
11876 Par := Parent (Inst_Node);
11877 while Present (Par) loop
11878 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
11879 Par := Parent (Par);
11882 pragma Assert (Present (Par));
11884 if Nkind (Par) = N_Package_Body then
11885 Collect_Previous_Instances (Declarations (Par));
11887 elsif Nkind (Par) = N_Package_Declaration then
11888 Collect_Previous_Instances
11889 (Visible_Declarations (Specification (Par)));
11890 Collect_Previous_Instances
11891 (Private_Declarations (Specification (Par)));
11894 -- Enclosing unit is a subprogram body. In this
11895 -- case all instance bodies are processed in order
11896 -- and there is no need to collect them separately.
11901 Decl := First_Elmt (Previous_Instances);
11902 while Present (Decl) loop
11904 (Inst_Node => Node (Decl),
11906 Instance_Spec (Node (Decl)),
11907 Expander_Status => Exp_Status,
11908 Current_Sem_Unit =>
11909 Get_Code_Unit (Sloc (Node (Decl))),
11910 Scope_Suppress => Scope_Suppress,
11911 Local_Suppress_Stack_Top =>
11912 Local_Suppress_Stack_Top,
11913 Version => Ada_Version);
11915 -- Package instance
11918 Nkind (Node (Decl)) = N_Package_Instantiation
11920 Instantiate_Package_Body
11921 (Info, Body_Optional => True);
11923 -- Subprogram instance
11926 -- The instance_spec is the wrapper package,
11927 -- and the subprogram declaration is the last
11928 -- declaration in the wrapper.
11932 (Visible_Declarations
11933 (Specification (Info.Act_Decl)));
11935 Instantiate_Subprogram_Body
11936 (Info, Body_Optional => True);
11944 Instantiate_Package_Body
11946 ((Inst_Node => Inst_Node,
11947 Act_Decl => True_Parent,
11948 Expander_Status => Exp_Status,
11949 Current_Sem_Unit =>
11950 Get_Code_Unit (Sloc (Inst_Node)),
11951 Scope_Suppress => Scope_Suppress,
11952 Local_Suppress_Stack_Top =>
11953 Local_Suppress_Stack_Top,
11954 Version => Ada_Version)),
11955 Body_Optional => Body_Optional);
11959 -- Case where we are not instantiating a nested generic
11962 Opt.Style_Check := False;
11963 Expander_Mode_Save_And_Set (True);
11964 Load_Needed_Body (Comp_Unit, OK);
11965 Opt.Style_Check := Save_Style_Check;
11966 Expander_Mode_Restore;
11969 and then Unit_Requires_Body (Defining_Entity (Spec))
11970 and then not Body_Optional
11973 Bname : constant Unit_Name_Type :=
11974 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
11977 -- In CodePeer mode, the missing body may make the analysis
11978 -- incomplete, but we do not treat it as fatal.
11980 if CodePeer_Mode then
11984 Error_Msg_Unit_1 := Bname;
11985 Error_Msg_N ("this instantiation requires$!", N);
11986 Error_Msg_File_1 :=
11987 Get_File_Name (Bname, Subunit => False);
11988 Error_Msg_N ("\but file{ was not found!", N);
11989 raise Unrecoverable_Error;
11996 -- If loading parent of the generic caused an instantiation circularity,
11997 -- we abandon compilation at this point, because otherwise in some cases
11998 -- we get into trouble with infinite recursions after this point.
12000 if Circularity_Detected then
12001 raise Unrecoverable_Error;
12003 end Load_Parent_Of_Generic;
12005 ---------------------------------
12006 -- Map_Formal_Package_Entities --
12007 ---------------------------------
12009 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
12014 Set_Instance_Of (Form, Act);
12016 -- Traverse formal and actual package to map the corresponding entities.
12017 -- We skip over internal entities that may be generated during semantic
12018 -- analysis, and find the matching entities by name, given that they
12019 -- must appear in the same order.
12021 E1 := First_Entity (Form);
12022 E2 := First_Entity (Act);
12023 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
12024 -- Could this test be a single condition???
12025 -- Seems like it could, and isn't FPE (Form) a constant anyway???
12027 if not Is_Internal (E1)
12028 and then Present (Parent (E1))
12029 and then not Is_Class_Wide_Type (E1)
12030 and then not Is_Internal_Name (Chars (E1))
12032 while Present (E2) and then Chars (E2) /= Chars (E1) loop
12039 Set_Instance_Of (E1, E2);
12041 if Is_Type (E1) and then Is_Tagged_Type (E2) then
12042 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
12045 if Is_Constrained (E1) then
12046 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
12049 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
12050 Map_Formal_Package_Entities (E1, E2);
12057 end Map_Formal_Package_Entities;
12059 -----------------------
12060 -- Move_Freeze_Nodes --
12061 -----------------------
12063 procedure Move_Freeze_Nodes
12064 (Out_Of : Entity_Id;
12069 Next_Decl : Node_Id;
12070 Next_Node : Node_Id := After;
12073 function Is_Outer_Type (T : Entity_Id) return Boolean;
12074 -- Check whether entity is declared in a scope external to that of the
12077 -------------------
12078 -- Is_Outer_Type --
12079 -------------------
12081 function Is_Outer_Type (T : Entity_Id) return Boolean is
12082 Scop : Entity_Id := Scope (T);
12085 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
12089 while Scop /= Standard_Standard loop
12090 if Scop = Out_Of then
12093 Scop := Scope (Scop);
12101 -- Start of processing for Move_Freeze_Nodes
12108 -- First remove the freeze nodes that may appear before all other
12112 while Present (Decl)
12113 and then Nkind (Decl) = N_Freeze_Entity
12114 and then Is_Outer_Type (Entity (Decl))
12116 Decl := Remove_Head (L);
12117 Insert_After (Next_Node, Decl);
12118 Set_Analyzed (Decl, False);
12123 -- Next scan the list of declarations and remove each freeze node that
12124 -- appears ahead of the current node.
12126 while Present (Decl) loop
12127 while Present (Next (Decl))
12128 and then Nkind (Next (Decl)) = N_Freeze_Entity
12129 and then Is_Outer_Type (Entity (Next (Decl)))
12131 Next_Decl := Remove_Next (Decl);
12132 Insert_After (Next_Node, Next_Decl);
12133 Set_Analyzed (Next_Decl, False);
12134 Next_Node := Next_Decl;
12137 -- If the declaration is a nested package or concurrent type, then
12138 -- recurse. Nested generic packages will have been processed from the
12141 case Nkind (Decl) is
12142 when N_Package_Declaration =>
12143 Spec := Specification (Decl);
12145 when N_Task_Type_Declaration =>
12146 Spec := Task_Definition (Decl);
12148 when N_Protected_Type_Declaration =>
12149 Spec := Protected_Definition (Decl);
12155 if Present (Spec) then
12156 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
12157 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
12162 end Move_Freeze_Nodes;
12168 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
12170 return Generic_Renamings.Table (E).Next_In_HTable;
12173 ------------------------
12174 -- Preanalyze_Actuals --
12175 ------------------------
12177 procedure Preanalyze_Actuals (N : Node_Id) is
12180 Errs : constant Int := Serious_Errors_Detected;
12182 Cur : Entity_Id := Empty;
12183 -- Current homograph of the instance name
12186 -- Saved visibility status of the current homograph
12189 Assoc := First (Generic_Associations (N));
12191 -- If the instance is a child unit, its name may hide an outer homonym,
12192 -- so make it invisible to perform name resolution on the actuals.
12194 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
12196 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
12198 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
12200 if Is_Compilation_Unit (Cur) then
12201 Vis := Is_Immediately_Visible (Cur);
12202 Set_Is_Immediately_Visible (Cur, False);
12208 while Present (Assoc) loop
12209 if Nkind (Assoc) /= N_Others_Choice then
12210 Act := Explicit_Generic_Actual_Parameter (Assoc);
12212 -- Within a nested instantiation, a defaulted actual is an empty
12213 -- association, so nothing to analyze. If the subprogram actual
12214 -- is an attribute, analyze prefix only, because actual is not a
12215 -- complete attribute reference.
12217 -- If actual is an allocator, analyze expression only. The full
12218 -- analysis can generate code, and if instance is a compilation
12219 -- unit we have to wait until the package instance is installed
12220 -- to have a proper place to insert this code.
12222 -- String literals may be operators, but at this point we do not
12223 -- know whether the actual is a formal subprogram or a string.
12228 elsif Nkind (Act) = N_Attribute_Reference then
12229 Analyze (Prefix (Act));
12231 elsif Nkind (Act) = N_Explicit_Dereference then
12232 Analyze (Prefix (Act));
12234 elsif Nkind (Act) = N_Allocator then
12236 Expr : constant Node_Id := Expression (Act);
12239 if Nkind (Expr) = N_Subtype_Indication then
12240 Analyze (Subtype_Mark (Expr));
12242 -- Analyze separately each discriminant constraint, when
12243 -- given with a named association.
12249 Constr := First (Constraints (Constraint (Expr)));
12250 while Present (Constr) loop
12251 if Nkind (Constr) = N_Discriminant_Association then
12252 Analyze (Expression (Constr));
12266 elsif Nkind (Act) /= N_Operator_Symbol then
12270 if Errs /= Serious_Errors_Detected then
12272 -- Do a minimal analysis of the generic, to prevent spurious
12273 -- warnings complaining about the generic being unreferenced,
12274 -- before abandoning the instantiation.
12276 Analyze (Name (N));
12278 if Is_Entity_Name (Name (N))
12279 and then Etype (Name (N)) /= Any_Type
12281 Generate_Reference (Entity (Name (N)), Name (N));
12282 Set_Is_Instantiated (Entity (Name (N)));
12285 if Present (Cur) then
12287 -- For the case of a child instance hiding an outer homonym,
12288 -- provide additional warning which might explain the error.
12290 Set_Is_Immediately_Visible (Cur, Vis);
12291 Error_Msg_NE ("& hides outer unit with the same name?",
12292 N, Defining_Unit_Name (N));
12295 Abandon_Instantiation (Act);
12302 if Present (Cur) then
12303 Set_Is_Immediately_Visible (Cur, Vis);
12305 end Preanalyze_Actuals;
12307 -------------------
12308 -- Remove_Parent --
12309 -------------------
12311 procedure Remove_Parent (In_Body : Boolean := False) is
12312 S : Entity_Id := Current_Scope;
12313 -- S is the scope containing the instantiation just completed. The scope
12314 -- stack contains the parent instances of the instantiation, followed by
12323 -- After child instantiation is complete, remove from scope stack the
12324 -- extra copy of the current scope, and then remove parent instances.
12326 if not In_Body then
12329 while Current_Scope /= S loop
12330 P := Current_Scope;
12331 End_Package_Scope (Current_Scope);
12333 if In_Open_Scopes (P) then
12334 E := First_Entity (P);
12335 while Present (E) loop
12336 Set_Is_Immediately_Visible (E, True);
12340 -- If instantiation is declared in a block, it is the enclosing
12341 -- scope that might be a parent instance. Note that only one
12342 -- block can be involved, because the parent instances have
12343 -- been installed within it.
12345 if Ekind (P) = E_Block then
12346 Cur_P := Scope (P);
12351 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
12352 -- We are within an instance of some sibling. Retain
12353 -- visibility of parent, for proper subsequent cleanup, and
12354 -- reinstall private declarations as well.
12356 Set_In_Private_Part (P);
12357 Install_Private_Declarations (P);
12360 -- If the ultimate parent is a top-level unit recorded in
12361 -- Instance_Parent_Unit, then reset its visibility to what it was
12362 -- before instantiation. (It's not clear what the purpose is of
12363 -- testing whether Scope (P) is In_Open_Scopes, but that test was
12364 -- present before the ultimate parent test was added.???)
12366 elsif not In_Open_Scopes (Scope (P))
12367 or else (P = Instance_Parent_Unit
12368 and then not Parent_Unit_Visible)
12370 Set_Is_Immediately_Visible (P, False);
12372 -- If the current scope is itself an instantiation of a generic
12373 -- nested within P, and we are in the private part of body of this
12374 -- instantiation, restore the full views of P, that were removed
12375 -- in End_Package_Scope above. This obscure case can occur when a
12376 -- subunit of a generic contains an instance of a child unit of
12377 -- its generic parent unit.
12379 elsif S = Current_Scope and then Is_Generic_Instance (S) then
12381 Par : constant Entity_Id :=
12383 (Specification (Unit_Declaration_Node (S)));
12386 and then P = Scope (Par)
12387 and then (In_Package_Body (S) or else In_Private_Part (S))
12389 Set_In_Private_Part (P);
12390 Install_Private_Declarations (P);
12396 -- Reset visibility of entities in the enclosing scope
12398 Set_Is_Hidden_Open_Scope (Current_Scope, False);
12400 Hidden := First_Elmt (Hidden_Entities);
12401 while Present (Hidden) loop
12402 Set_Is_Immediately_Visible (Node (Hidden), True);
12403 Next_Elmt (Hidden);
12407 -- Each body is analyzed separately, and there is no context that
12408 -- needs preserving from one body instance to the next, so remove all
12409 -- parent scopes that have been installed.
12411 while Present (S) loop
12412 End_Package_Scope (S);
12413 Set_Is_Immediately_Visible (S, False);
12414 S := Current_Scope;
12415 exit when S = Standard_Standard;
12424 procedure Restore_Env is
12425 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
12428 if No (Current_Instantiated_Parent.Act_Id) then
12429 -- Restore environment after subprogram inlining
12431 Restore_Private_Views (Empty);
12434 Current_Instantiated_Parent := Saved.Instantiated_Parent;
12435 Exchanged_Views := Saved.Exchanged_Views;
12436 Hidden_Entities := Saved.Hidden_Entities;
12437 Current_Sem_Unit := Saved.Current_Sem_Unit;
12438 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
12439 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
12441 Restore_Opt_Config_Switches (Saved.Switches);
12443 Instance_Envs.Decrement_Last;
12446 ---------------------------
12447 -- Restore_Private_Views --
12448 ---------------------------
12450 procedure Restore_Private_Views
12451 (Pack_Id : Entity_Id;
12452 Is_Package : Boolean := True)
12457 Dep_Elmt : Elmt_Id;
12460 procedure Restore_Nested_Formal (Formal : Entity_Id);
12461 -- Hide the generic formals of formal packages declared with box which
12462 -- were reachable in the current instantiation.
12464 ---------------------------
12465 -- Restore_Nested_Formal --
12466 ---------------------------
12468 procedure Restore_Nested_Formal (Formal : Entity_Id) is
12472 if Present (Renamed_Object (Formal))
12473 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
12477 elsif Present (Associated_Formal_Package (Formal)) then
12478 Ent := First_Entity (Formal);
12479 while Present (Ent) loop
12480 exit when Ekind (Ent) = E_Package
12481 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
12483 Set_Is_Hidden (Ent);
12484 Set_Is_Potentially_Use_Visible (Ent, False);
12486 -- If package, then recurse
12488 if Ekind (Ent) = E_Package then
12489 Restore_Nested_Formal (Ent);
12495 end Restore_Nested_Formal;
12497 -- Start of processing for Restore_Private_Views
12500 M := First_Elmt (Exchanged_Views);
12501 while Present (M) loop
12504 -- Subtypes of types whose views have been exchanged, and that are
12505 -- defined within the instance, were not on the Private_Dependents
12506 -- list on entry to the instance, so they have to be exchanged
12507 -- explicitly now, in order to remain consistent with the view of the
12510 if Ekind_In (Typ, E_Private_Type,
12511 E_Limited_Private_Type,
12512 E_Record_Type_With_Private)
12514 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
12515 while Present (Dep_Elmt) loop
12516 Dep_Typ := Node (Dep_Elmt);
12518 if Scope (Dep_Typ) = Pack_Id
12519 and then Present (Full_View (Dep_Typ))
12521 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
12522 Exchange_Declarations (Dep_Typ);
12525 Next_Elmt (Dep_Elmt);
12529 Exchange_Declarations (Node (M));
12533 if No (Pack_Id) then
12537 -- Make the generic formal parameters private, and make the formal types
12538 -- into subtypes of the actuals again.
12540 E := First_Entity (Pack_Id);
12541 while Present (E) loop
12542 Set_Is_Hidden (E, True);
12545 and then Nkind (Parent (E)) = N_Subtype_Declaration
12547 Set_Is_Generic_Actual_Type (E, False);
12549 -- An unusual case of aliasing: the actual may also be directly
12550 -- visible in the generic, and be private there, while it is fully
12551 -- visible in the context of the instance. The internal subtype
12552 -- is private in the instance but has full visibility like its
12553 -- parent in the enclosing scope. This enforces the invariant that
12554 -- the privacy status of all private dependents of a type coincide
12555 -- with that of the parent type. This can only happen when a
12556 -- generic child unit is instantiated within a sibling.
12558 if Is_Private_Type (E)
12559 and then not Is_Private_Type (Etype (E))
12561 Exchange_Declarations (E);
12564 elsif Ekind (E) = E_Package then
12566 -- The end of the renaming list is the renaming of the generic
12567 -- package itself. If the instance is a subprogram, all entities
12568 -- in the corresponding package are renamings. If this entity is
12569 -- a formal package, make its own formals private as well. The
12570 -- actual in this case is itself the renaming of an instantiation.
12571 -- If the entity is not a package renaming, it is the entity
12572 -- created to validate formal package actuals: ignore it.
12574 -- If the actual is itself a formal package for the enclosing
12575 -- generic, or the actual for such a formal package, it remains
12576 -- visible on exit from the instance, and therefore nothing needs
12577 -- to be done either, except to keep it accessible.
12579 if Is_Package and then Renamed_Object (E) = Pack_Id then
12582 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
12586 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
12588 Set_Is_Hidden (E, False);
12592 Act_P : constant Entity_Id := Renamed_Object (E);
12596 Id := First_Entity (Act_P);
12598 and then Id /= First_Private_Entity (Act_P)
12600 exit when Ekind (Id) = E_Package
12601 and then Renamed_Object (Id) = Act_P;
12603 Set_Is_Hidden (Id, True);
12604 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
12606 if Ekind (Id) = E_Package then
12607 Restore_Nested_Formal (Id);
12618 end Restore_Private_Views;
12625 (Gen_Unit : Entity_Id;
12626 Act_Unit : Entity_Id)
12630 Set_Instance_Env (Gen_Unit, Act_Unit);
12633 ----------------------------
12634 -- Save_Global_References --
12635 ----------------------------
12637 procedure Save_Global_References (N : Node_Id) is
12638 Gen_Scope : Entity_Id;
12642 function Is_Global (E : Entity_Id) return Boolean;
12643 -- Check whether entity is defined outside of generic unit. Examine the
12644 -- scope of an entity, and the scope of the scope, etc, until we find
12645 -- either Standard, in which case the entity is global, or the generic
12646 -- unit itself, which indicates that the entity is local. If the entity
12647 -- is the generic unit itself, as in the case of a recursive call, or
12648 -- the enclosing generic unit, if different from the current scope, then
12649 -- it is local as well, because it will be replaced at the point of
12650 -- instantiation. On the other hand, if it is a reference to a child
12651 -- unit of a common ancestor, which appears in an instantiation, it is
12652 -- global because it is used to denote a specific compilation unit at
12653 -- the time the instantiations will be analyzed.
12655 procedure Reset_Entity (N : Node_Id);
12656 -- Save semantic information on global entity so that it is not resolved
12657 -- again at instantiation time.
12659 procedure Save_Entity_Descendants (N : Node_Id);
12660 -- Apply Save_Global_References to the two syntactic descendants of
12661 -- non-terminal nodes that carry an Associated_Node and are processed
12662 -- through Reset_Entity. Once the global entity (if any) has been
12663 -- captured together with its type, only two syntactic descendants need
12664 -- to be traversed to complete the processing of the tree rooted at N.
12665 -- This applies to Selected_Components, Expanded_Names, and to Operator
12666 -- nodes. N can also be a character literal, identifier, or operator
12667 -- symbol node, but the call has no effect in these cases.
12669 procedure Save_Global_Defaults (N1, N2 : Node_Id);
12670 -- Default actuals in nested instances must be handled specially
12671 -- because there is no link to them from the original tree. When an
12672 -- actual subprogram is given by a default, we add an explicit generic
12673 -- association for it in the instantiation node. When we save the
12674 -- global references on the name of the instance, we recover the list
12675 -- of generic associations, and add an explicit one to the original
12676 -- generic tree, through which a global actual can be preserved.
12677 -- Similarly, if a child unit is instantiated within a sibling, in the
12678 -- context of the parent, we must preserve the identifier of the parent
12679 -- so that it can be properly resolved in a subsequent instantiation.
12681 procedure Save_Global_Descendant (D : Union_Id);
12682 -- Apply Save_Global_References recursively to the descendents of the
12685 procedure Save_References (N : Node_Id);
12686 -- This is the recursive procedure that does the work, once the
12687 -- enclosing generic scope has been established.
12693 function Is_Global (E : Entity_Id) return Boolean is
12696 function Is_Instance_Node (Decl : Node_Id) return Boolean;
12697 -- Determine whether the parent node of a reference to a child unit
12698 -- denotes an instantiation or a formal package, in which case the
12699 -- reference to the child unit is global, even if it appears within
12700 -- the current scope (e.g. when the instance appears within the body
12701 -- of an ancestor).
12703 ----------------------
12704 -- Is_Instance_Node --
12705 ----------------------
12707 function Is_Instance_Node (Decl : Node_Id) return Boolean is
12709 return Nkind (Decl) in N_Generic_Instantiation
12711 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
12712 end Is_Instance_Node;
12714 -- Start of processing for Is_Global
12717 if E = Gen_Scope then
12720 elsif E = Standard_Standard then
12723 elsif Is_Child_Unit (E)
12724 and then (Is_Instance_Node (Parent (N2))
12725 or else (Nkind (Parent (N2)) = N_Expanded_Name
12726 and then N2 = Selector_Name (Parent (N2))
12728 Is_Instance_Node (Parent (Parent (N2)))))
12734 while Se /= Gen_Scope loop
12735 if Se = Standard_Standard then
12750 procedure Reset_Entity (N : Node_Id) is
12752 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
12753 -- If the type of N2 is global to the generic unit, save the type in
12754 -- the generic node. Just as we perform name capture for explicit
12755 -- references within the generic, we must capture the global types
12756 -- of local entities because they may participate in resolution in
12759 function Top_Ancestor (E : Entity_Id) return Entity_Id;
12760 -- Find the ultimate ancestor of the current unit. If it is not a
12761 -- generic unit, then the name of the current unit in the prefix of
12762 -- an expanded name must be replaced with its generic homonym to
12763 -- ensure that it will be properly resolved in an instance.
12765 ---------------------
12766 -- Set_Global_Type --
12767 ---------------------
12769 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
12770 Typ : constant Entity_Id := Etype (N2);
12773 Set_Etype (N, Typ);
12775 if Entity (N) /= N2
12776 and then Has_Private_View (Entity (N))
12778 -- If the entity of N is not the associated node, this is a
12779 -- nested generic and it has an associated node as well, whose
12780 -- type is already the full view (see below). Indicate that the
12781 -- original node has a private view.
12783 Set_Has_Private_View (N);
12786 -- If not a private type, nothing else to do
12788 if not Is_Private_Type (Typ) then
12789 if Is_Array_Type (Typ)
12790 and then Is_Private_Type (Component_Type (Typ))
12792 Set_Has_Private_View (N);
12795 -- If it is a derivation of a private type in a context where no
12796 -- full view is needed, nothing to do either.
12798 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
12801 -- Otherwise mark the type for flipping and use the full view when
12805 Set_Has_Private_View (N);
12807 if Present (Full_View (Typ)) then
12808 Set_Etype (N2, Full_View (Typ));
12811 end Set_Global_Type;
12817 function Top_Ancestor (E : Entity_Id) return Entity_Id is
12822 while Is_Child_Unit (Par) loop
12823 Par := Scope (Par);
12829 -- Start of processing for Reset_Entity
12832 N2 := Get_Associated_Node (N);
12835 if Present (E) then
12837 -- If the node is an entry call to an entry in an enclosing task,
12838 -- it is rewritten as a selected component. No global entity to
12839 -- preserve in this case, since the expansion will be redone in
12842 if not Nkind_In (E, N_Defining_Identifier,
12843 N_Defining_Character_Literal,
12844 N_Defining_Operator_Symbol)
12846 Set_Associated_Node (N, Empty);
12847 Set_Etype (N, Empty);
12851 -- If the entity is an itype created as a subtype of an access
12852 -- type with a null exclusion restore source entity for proper
12853 -- visibility. The itype will be created anew in the instance.
12856 and then Ekind (E) = E_Access_Subtype
12857 and then Is_Entity_Name (N)
12858 and then Chars (Etype (E)) = Chars (N)
12861 Set_Entity (N2, E);
12865 if Is_Global (E) then
12866 Set_Global_Type (N, N2);
12868 elsif Nkind (N) = N_Op_Concat
12869 and then Is_Generic_Type (Etype (N2))
12870 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
12872 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
12873 and then Is_Intrinsic_Subprogram (E)
12878 -- Entity is local. Mark generic node as unresolved.
12879 -- Note that now it does not have an entity.
12881 Set_Associated_Node (N, Empty);
12882 Set_Etype (N, Empty);
12885 if Nkind (Parent (N)) in N_Generic_Instantiation
12886 and then N = Name (Parent (N))
12888 Save_Global_Defaults (Parent (N), Parent (N2));
12891 elsif Nkind (Parent (N)) = N_Selected_Component
12892 and then Nkind (Parent (N2)) = N_Expanded_Name
12894 if Is_Global (Entity (Parent (N2))) then
12895 Change_Selected_Component_To_Expanded_Name (Parent (N));
12896 Set_Associated_Node (Parent (N), Parent (N2));
12897 Set_Global_Type (Parent (N), Parent (N2));
12898 Save_Entity_Descendants (N);
12900 -- If this is a reference to the current generic entity, replace
12901 -- by the name of the generic homonym of the current package. This
12902 -- is because in an instantiation Par.P.Q will not resolve to the
12903 -- name of the instance, whose enclosing scope is not necessarily
12904 -- Par. We use the generic homonym rather that the name of the
12905 -- generic itself because it may be hidden by a local declaration.
12907 elsif In_Open_Scopes (Entity (Parent (N2)))
12909 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
12911 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
12912 Rewrite (Parent (N),
12913 Make_Identifier (Sloc (N),
12915 Chars (Generic_Homonym (Entity (Parent (N2))))));
12917 Rewrite (Parent (N),
12918 Make_Identifier (Sloc (N),
12919 Chars => Chars (Selector_Name (Parent (N2)))));
12923 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
12924 and then Parent (N) = Name (Parent (Parent (N)))
12926 Save_Global_Defaults
12927 (Parent (Parent (N)), Parent (Parent ((N2))));
12930 -- A selected component may denote a static constant that has been
12931 -- folded. If the static constant is global to the generic, capture
12932 -- its value. Otherwise the folding will happen in any instantiation.
12934 elsif Nkind (Parent (N)) = N_Selected_Component
12935 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
12937 if Present (Entity (Original_Node (Parent (N2))))
12938 and then Is_Global (Entity (Original_Node (Parent (N2))))
12940 Rewrite (Parent (N), New_Copy (Parent (N2)));
12941 Set_Analyzed (Parent (N), False);
12947 -- A selected component may be transformed into a parameterless
12948 -- function call. If the called entity is global, rewrite the node
12949 -- appropriately, i.e. as an extended name for the global entity.
12951 elsif Nkind (Parent (N)) = N_Selected_Component
12952 and then Nkind (Parent (N2)) = N_Function_Call
12953 and then N = Selector_Name (Parent (N))
12955 if No (Parameter_Associations (Parent (N2))) then
12956 if Is_Global (Entity (Name (Parent (N2)))) then
12957 Change_Selected_Component_To_Expanded_Name (Parent (N));
12958 Set_Associated_Node (Parent (N), Name (Parent (N2)));
12959 Set_Global_Type (Parent (N), Name (Parent (N2)));
12960 Save_Entity_Descendants (N);
12963 Set_Is_Prefixed_Call (Parent (N));
12964 Set_Associated_Node (N, Empty);
12965 Set_Etype (N, Empty);
12968 -- In Ada 2005, X.F may be a call to a primitive operation,
12969 -- rewritten as F (X). This rewriting will be done again in an
12970 -- instance, so keep the original node. Global entities will be
12971 -- captured as for other constructs. Indicate that this must
12972 -- resolve as a call, to prevent accidental overloading in the
12973 -- instance, if both a component and a primitive operation appear
12977 Set_Is_Prefixed_Call (Parent (N));
12980 -- Entity is local. Reset in generic unit, so that node is resolved
12981 -- anew at the point of instantiation.
12984 Set_Associated_Node (N, Empty);
12985 Set_Etype (N, Empty);
12989 -----------------------------
12990 -- Save_Entity_Descendants --
12991 -----------------------------
12993 procedure Save_Entity_Descendants (N : Node_Id) is
12996 when N_Binary_Op =>
12997 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
12998 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13001 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13003 when N_Expanded_Name | N_Selected_Component =>
13004 Save_Global_Descendant (Union_Id (Prefix (N)));
13005 Save_Global_Descendant (Union_Id (Selector_Name (N)));
13007 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
13011 raise Program_Error;
13013 end Save_Entity_Descendants;
13015 --------------------------
13016 -- Save_Global_Defaults --
13017 --------------------------
13019 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
13020 Loc : constant Source_Ptr := Sloc (N1);
13021 Assoc2 : constant List_Id := Generic_Associations (N2);
13022 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
13029 Actual : Entity_Id;
13032 Assoc1 := Generic_Associations (N1);
13034 if Present (Assoc1) then
13035 Act1 := First (Assoc1);
13038 Set_Generic_Associations (N1, New_List);
13039 Assoc1 := Generic_Associations (N1);
13042 if Present (Assoc2) then
13043 Act2 := First (Assoc2);
13048 while Present (Act1) and then Present (Act2) loop
13053 -- Find the associations added for default subprograms
13055 if Present (Act2) then
13056 while Nkind (Act2) /= N_Generic_Association
13057 or else No (Entity (Selector_Name (Act2)))
13058 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
13063 -- Add a similar association if the default is global. The
13064 -- renaming declaration for the actual has been analyzed, and
13065 -- its alias is the program it renames. Link the actual in the
13066 -- original generic tree with the node in the analyzed tree.
13068 while Present (Act2) loop
13069 Subp := Entity (Selector_Name (Act2));
13070 Def := Explicit_Generic_Actual_Parameter (Act2);
13072 -- Following test is defence against rubbish errors
13074 if No (Alias (Subp)) then
13078 -- Retrieve the resolved actual from the renaming declaration
13079 -- created for the instantiated formal.
13081 Actual := Entity (Name (Parent (Parent (Subp))));
13082 Set_Entity (Def, Actual);
13083 Set_Etype (Def, Etype (Actual));
13085 if Is_Global (Actual) then
13087 Make_Generic_Association (Loc,
13088 Selector_Name => New_Occurrence_Of (Subp, Loc),
13089 Explicit_Generic_Actual_Parameter =>
13090 New_Occurrence_Of (Actual, Loc));
13092 Set_Associated_Node
13093 (Explicit_Generic_Actual_Parameter (Ndec), Def);
13095 Append (Ndec, Assoc1);
13097 -- If there are other defaults, add a dummy association in case
13098 -- there are other defaulted formals with the same name.
13100 elsif Present (Next (Act2)) then
13102 Make_Generic_Association (Loc,
13103 Selector_Name => New_Occurrence_Of (Subp, Loc),
13104 Explicit_Generic_Actual_Parameter => Empty);
13106 Append (Ndec, Assoc1);
13113 if Nkind (Name (N1)) = N_Identifier
13114 and then Is_Child_Unit (Gen_Id)
13115 and then Is_Global (Gen_Id)
13116 and then Is_Generic_Unit (Scope (Gen_Id))
13117 and then In_Open_Scopes (Scope (Gen_Id))
13119 -- This is an instantiation of a child unit within a sibling, so
13120 -- that the generic parent is in scope. An eventual instance must
13121 -- occur within the scope of an instance of the parent. Make name
13122 -- in instance into an expanded name, to preserve the identifier
13123 -- of the parent, so it can be resolved subsequently.
13125 Rewrite (Name (N2),
13126 Make_Expanded_Name (Loc,
13127 Chars => Chars (Gen_Id),
13128 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13129 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13130 Set_Entity (Name (N2), Gen_Id);
13132 Rewrite (Name (N1),
13133 Make_Expanded_Name (Loc,
13134 Chars => Chars (Gen_Id),
13135 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13136 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13138 Set_Associated_Node (Name (N1), Name (N2));
13139 Set_Associated_Node (Prefix (Name (N1)), Empty);
13140 Set_Associated_Node
13141 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
13142 Set_Etype (Name (N1), Etype (Gen_Id));
13145 end Save_Global_Defaults;
13147 ----------------------------
13148 -- Save_Global_Descendant --
13149 ----------------------------
13151 procedure Save_Global_Descendant (D : Union_Id) is
13155 if D in Node_Range then
13156 if D = Union_Id (Empty) then
13159 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
13160 Save_References (Node_Id (D));
13163 elsif D in List_Range then
13164 if D = Union_Id (No_List)
13165 or else Is_Empty_List (List_Id (D))
13170 N1 := First (List_Id (D));
13171 while Present (N1) loop
13172 Save_References (N1);
13177 -- Element list or other non-node field, nothing to do
13182 end Save_Global_Descendant;
13184 ---------------------
13185 -- Save_References --
13186 ---------------------
13188 -- This is the recursive procedure that does the work once the enclosing
13189 -- generic scope has been established. We have to treat specially a
13190 -- number of node rewritings that are required by semantic processing
13191 -- and which change the kind of nodes in the generic copy: typically
13192 -- constant-folding, replacing an operator node by a string literal, or
13193 -- a selected component by an expanded name. In each of those cases, the
13194 -- transformation is propagated to the generic unit.
13196 procedure Save_References (N : Node_Id) is
13197 Loc : constant Source_Ptr := Sloc (N);
13203 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
13204 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13207 elsif Nkind (N) = N_Operator_Symbol
13208 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
13210 Change_Operator_Symbol_To_String_Literal (N);
13213 elsif Nkind (N) in N_Op then
13214 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13215 if Nkind (N) = N_Op_Concat then
13216 Set_Is_Component_Left_Opnd (N,
13217 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13219 Set_Is_Component_Right_Opnd (N,
13220 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13226 -- Node may be transformed into call to a user-defined operator
13228 N2 := Get_Associated_Node (N);
13230 if Nkind (N2) = N_Function_Call then
13231 E := Entity (Name (N2));
13234 and then Is_Global (E)
13236 Set_Etype (N, Etype (N2));
13238 Set_Associated_Node (N, Empty);
13239 Set_Etype (N, Empty);
13242 elsif Nkind_In (N2, N_Integer_Literal,
13246 if Present (Original_Node (N2))
13247 and then Nkind (Original_Node (N2)) = Nkind (N)
13250 -- Operation was constant-folded. Whenever possible,
13251 -- recover semantic information from unfolded node,
13254 Set_Associated_Node (N, Original_Node (N2));
13256 if Nkind (N) = N_Op_Concat then
13257 Set_Is_Component_Left_Opnd (N,
13258 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13259 Set_Is_Component_Right_Opnd (N,
13260 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13266 -- If original node is already modified, propagate
13267 -- constant-folding to template.
13269 Rewrite (N, New_Copy (N2));
13270 Set_Analyzed (N, False);
13273 elsif Nkind (N2) = N_Identifier
13274 and then Ekind (Entity (N2)) = E_Enumeration_Literal
13276 -- Same if call was folded into a literal, but in this case
13277 -- retain the entity to avoid spurious ambiguities if it is
13278 -- overloaded at the point of instantiation or inlining.
13280 Rewrite (N, New_Copy (N2));
13281 Set_Analyzed (N, False);
13285 -- Complete operands check if node has not been constant-folded
13287 if Nkind (N) in N_Op then
13288 Save_Entity_Descendants (N);
13291 elsif Nkind (N) = N_Identifier then
13292 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13294 -- If this is a discriminant reference, always save it. It is
13295 -- used in the instance to find the corresponding discriminant
13296 -- positionally rather than by name.
13298 Set_Original_Discriminant
13299 (N, Original_Discriminant (Get_Associated_Node (N)));
13303 N2 := Get_Associated_Node (N);
13305 if Nkind (N2) = N_Function_Call then
13306 E := Entity (Name (N2));
13308 -- Name resolves to a call to parameterless function. If
13309 -- original entity is global, mark node as resolved.
13312 and then Is_Global (E)
13314 Set_Etype (N, Etype (N2));
13316 Set_Associated_Node (N, Empty);
13317 Set_Etype (N, Empty);
13320 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
13321 and then Is_Entity_Name (Original_Node (N2))
13323 -- Name resolves to named number that is constant-folded,
13324 -- We must preserve the original name for ASIS use, and
13325 -- undo the constant-folding, which will be repeated in
13328 Set_Associated_Node (N, Original_Node (N2));
13331 elsif Nkind (N2) = N_String_Literal then
13333 -- Name resolves to string literal. Perform the same
13334 -- replacement in generic.
13336 Rewrite (N, New_Copy (N2));
13338 elsif Nkind (N2) = N_Explicit_Dereference then
13340 -- An identifier is rewritten as a dereference if it is the
13341 -- prefix in an implicit dereference (call or attribute).
13342 -- The analysis of an instantiation will expand the node
13343 -- again, so we preserve the original tree but link it to
13344 -- the resolved entity in case it is global.
13346 if Is_Entity_Name (Prefix (N2))
13347 and then Present (Entity (Prefix (N2)))
13348 and then Is_Global (Entity (Prefix (N2)))
13350 Set_Associated_Node (N, Prefix (N2));
13352 elsif Nkind (Prefix (N2)) = N_Function_Call
13353 and then Is_Global (Entity (Name (Prefix (N2))))
13356 Make_Explicit_Dereference (Loc,
13357 Prefix => Make_Function_Call (Loc,
13359 New_Occurrence_Of (Entity (Name (Prefix (N2))),
13363 Set_Associated_Node (N, Empty);
13364 Set_Etype (N, Empty);
13367 -- The subtype mark of a nominally unconstrained object is
13368 -- rewritten as a subtype indication using the bounds of the
13369 -- expression. Recover the original subtype mark.
13371 elsif Nkind (N2) = N_Subtype_Indication
13372 and then Is_Entity_Name (Original_Node (N2))
13374 Set_Associated_Node (N, Original_Node (N2));
13382 elsif Nkind (N) in N_Entity then
13387 Qual : Node_Id := Empty;
13388 Typ : Entity_Id := Empty;
13391 use Atree.Unchecked_Access;
13392 -- This code section is part of implementing an untyped tree
13393 -- traversal, so it needs direct access to node fields.
13396 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
13397 N2 := Get_Associated_Node (N);
13404 -- In an instance within a generic, use the name of the
13405 -- actual and not the original generic parameter. If the
13406 -- actual is global in the current generic it must be
13407 -- preserved for its instantiation.
13409 if Nkind (Parent (Typ)) = N_Subtype_Declaration
13411 Present (Generic_Parent_Type (Parent (Typ)))
13413 Typ := Base_Type (Typ);
13414 Set_Etype (N2, Typ);
13420 or else not Is_Global (Typ)
13422 Set_Associated_Node (N, Empty);
13424 -- If the aggregate is an actual in a call, it has been
13425 -- resolved in the current context, to some local type.
13426 -- The enclosing call may have been disambiguated by the
13427 -- aggregate, and this disambiguation might fail at
13428 -- instantiation time because the type to which the
13429 -- aggregate did resolve is not preserved. In order to
13430 -- preserve some of this information, we wrap the
13431 -- aggregate in a qualified expression, using the id of
13432 -- its type. For further disambiguation we qualify the
13433 -- type name with its scope (if visible) because both
13434 -- id's will have corresponding entities in an instance.
13435 -- This resolves most of the problems with missing type
13436 -- information on aggregates in instances.
13438 if Nkind (N2) = Nkind (N)
13440 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
13442 and then Comes_From_Source (Typ)
13444 if Is_Immediately_Visible (Scope (Typ)) then
13445 Nam := Make_Selected_Component (Loc,
13447 Make_Identifier (Loc, Chars (Scope (Typ))),
13449 Make_Identifier (Loc, Chars (Typ)));
13451 Nam := Make_Identifier (Loc, Chars (Typ));
13455 Make_Qualified_Expression (Loc,
13456 Subtype_Mark => Nam,
13457 Expression => Relocate_Node (N));
13461 Save_Global_Descendant (Field1 (N));
13462 Save_Global_Descendant (Field2 (N));
13463 Save_Global_Descendant (Field3 (N));
13464 Save_Global_Descendant (Field5 (N));
13466 if Present (Qual) then
13470 -- All other cases than aggregates
13473 Save_Global_Descendant (Field1 (N));
13474 Save_Global_Descendant (Field2 (N));
13475 Save_Global_Descendant (Field3 (N));
13476 Save_Global_Descendant (Field4 (N));
13477 Save_Global_Descendant (Field5 (N));
13482 -- If a node has aspects, references within their expressions must
13483 -- be saved separately, given that they are not directly in the
13486 if Has_Aspects (N) then
13490 Aspect := First (Aspect_Specifications (N));
13491 while Present (Aspect) loop
13492 Save_Global_References (Expression (Aspect));
13497 end Save_References;
13499 -- Start of processing for Save_Global_References
13502 Gen_Scope := Current_Scope;
13504 -- If the generic unit is a child unit, references to entities in the
13505 -- parent are treated as local, because they will be resolved anew in
13506 -- the context of the instance of the parent.
13508 while Is_Child_Unit (Gen_Scope)
13509 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
13511 Gen_Scope := Scope (Gen_Scope);
13514 Save_References (N);
13515 end Save_Global_References;
13517 --------------------------------------
13518 -- Set_Copied_Sloc_For_Inlined_Body --
13519 --------------------------------------
13521 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
13523 Create_Instantiation_Source (N, E, True, S_Adjustment);
13524 end Set_Copied_Sloc_For_Inlined_Body;
13526 ---------------------
13527 -- Set_Instance_Of --
13528 ---------------------
13530 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
13532 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
13533 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
13534 Generic_Renamings.Increment_Last;
13535 end Set_Instance_Of;
13537 --------------------
13538 -- Set_Next_Assoc --
13539 --------------------
13541 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
13543 Generic_Renamings.Table (E).Next_In_HTable := Next;
13544 end Set_Next_Assoc;
13546 -------------------
13547 -- Start_Generic --
13548 -------------------
13550 procedure Start_Generic is
13552 -- ??? More things could be factored out in this routine.
13553 -- Should probably be done at a later stage.
13555 Generic_Flags.Append (Inside_A_Generic);
13556 Inside_A_Generic := True;
13558 Expander_Mode_Save_And_Set (False);
13561 ----------------------
13562 -- Set_Instance_Env --
13563 ----------------------
13565 procedure Set_Instance_Env
13566 (Gen_Unit : Entity_Id;
13567 Act_Unit : Entity_Id)
13570 -- Regardless of the current mode, predefined units are analyzed in the
13571 -- most current Ada mode, and earlier version Ada checks do not apply
13572 -- to predefined units. Nothing needs to be done for non-internal units.
13573 -- These are always analyzed in the current mode.
13575 if Is_Internal_File_Name
13576 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
13577 Renamings_Included => True)
13579 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
13582 Current_Instantiated_Parent :=
13583 (Gen_Id => Gen_Unit,
13584 Act_Id => Act_Unit,
13585 Next_In_HTable => Assoc_Null);
13586 end Set_Instance_Env;
13592 procedure Switch_View (T : Entity_Id) is
13593 BT : constant Entity_Id := Base_Type (T);
13594 Priv_Elmt : Elmt_Id := No_Elmt;
13595 Priv_Sub : Entity_Id;
13598 -- T may be private but its base type may have been exchanged through
13599 -- some other occurrence, in which case there is nothing to switch
13600 -- besides T itself. Note that a private dependent subtype of a private
13601 -- type might not have been switched even if the base type has been,
13602 -- because of the last branch of Check_Private_View (see comment there).
13604 if not Is_Private_Type (BT) then
13605 Prepend_Elmt (Full_View (T), Exchanged_Views);
13606 Exchange_Declarations (T);
13610 Priv_Elmt := First_Elmt (Private_Dependents (BT));
13612 if Present (Full_View (BT)) then
13613 Prepend_Elmt (Full_View (BT), Exchanged_Views);
13614 Exchange_Declarations (BT);
13617 while Present (Priv_Elmt) loop
13618 Priv_Sub := (Node (Priv_Elmt));
13620 -- We avoid flipping the subtype if the Etype of its full view is
13621 -- private because this would result in a malformed subtype. This
13622 -- occurs when the Etype of the subtype full view is the full view of
13623 -- the base type (and since the base types were just switched, the
13624 -- subtype is pointing to the wrong view). This is currently the case
13625 -- for tagged record types, access types (maybe more?) and needs to
13626 -- be resolved. ???
13628 if Present (Full_View (Priv_Sub))
13629 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
13631 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
13632 Exchange_Declarations (Priv_Sub);
13635 Next_Elmt (Priv_Elmt);
13643 function True_Parent (N : Node_Id) return Node_Id is
13645 if Nkind (Parent (N)) = N_Subunit then
13646 return Parent (Corresponding_Stub (Parent (N)));
13652 -----------------------------
13653 -- Valid_Default_Attribute --
13654 -----------------------------
13656 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
13657 Attr_Id : constant Attribute_Id :=
13658 Get_Attribute_Id (Attribute_Name (Def));
13659 T : constant Entity_Id := Entity (Prefix (Def));
13660 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
13673 F := First_Formal (Nam);
13674 while Present (F) loop
13675 Num_F := Num_F + 1;
13680 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
13681 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
13682 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
13683 Attribute_Unbiased_Rounding =>
13686 and then Is_Floating_Point_Type (T);
13688 when Attribute_Image | Attribute_Pred | Attribute_Succ |
13689 Attribute_Value | Attribute_Wide_Image |
13690 Attribute_Wide_Value =>
13691 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
13693 when Attribute_Max | Attribute_Min =>
13694 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
13696 when Attribute_Input =>
13697 OK := (Is_Fun and then Num_F = 1);
13699 when Attribute_Output | Attribute_Read | Attribute_Write =>
13700 OK := (not Is_Fun and then Num_F = 2);
13707 Error_Msg_N ("attribute reference has wrong profile for subprogram",
13710 end Valid_Default_Attribute;