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 Debug; use Debug;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Expander; use Expander;
33 with Exp_Disp; use Exp_Disp;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
36 with Freeze; use Freeze;
37 with Itypes; use Itypes;
39 with Lib.Load; use Lib.Load;
40 with Lib.Xref; use Lib.Xref;
41 with Nlists; use Nlists;
42 with Namet; use Namet;
43 with Nmake; use Nmake;
45 with Rident; use Rident;
46 with Restrict; use Restrict;
47 with Rtsfind; use Rtsfind;
49 with Sem_Aux; use Sem_Aux;
50 with Sem_Cat; use Sem_Cat;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch7; use Sem_Ch7;
54 with Sem_Ch8; use Sem_Ch8;
55 with Sem_Ch10; use Sem_Ch10;
56 with Sem_Ch13; use Sem_Ch13;
57 with Sem_Dim; use Sem_Dim;
58 with Sem_Disp; use Sem_Disp;
59 with Sem_Elab; use Sem_Elab;
60 with Sem_Elim; use Sem_Elim;
61 with Sem_Eval; use Sem_Eval;
62 with Sem_Prag; use Sem_Prag;
63 with Sem_Res; use Sem_Res;
64 with Sem_Type; use Sem_Type;
65 with Sem_Util; use Sem_Util;
66 with Sem_Warn; use Sem_Warn;
67 with Stand; use Stand;
68 with Sinfo; use Sinfo;
69 with Sinfo.CN; use Sinfo.CN;
70 with Sinput; use Sinput;
71 with Sinput.L; use Sinput.L;
72 with Snames; use Snames;
73 with Stringt; use Stringt;
74 with Uname; use Uname;
76 with Tbuild; use Tbuild;
77 with Uintp; use Uintp;
78 with Urealp; use Urealp;
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 Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1453 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1454 N_Access_To_Object_Definition
1457 Formal_Ent : constant Entity_Id :=
1458 Defining_Identifier (Analyzed_Formal);
1460 if Is_Remote_Access_To_Class_Wide_Type (Entity (Match))
1461 = Is_Remote_Types (Formal_Ent)
1463 -- Remoteness of formal and actual match
1467 elsif Is_Remote_Types (Formal_Ent) then
1469 -- Remote formal, non-remote actual
1472 ("actual for& must be remote", Match, Formal_Ent);
1475 -- Non-remote formal, remote actual
1478 ("actual for& may not be remote",
1484 when N_Formal_Subprogram_Declaration =>
1487 (Defining_Unit_Name (Specification (Formal)),
1488 Defining_Unit_Name (Specification (Analyzed_Formal)));
1490 -- If the formal subprogram has the same name as another
1491 -- formal subprogram of the generic, then a named
1492 -- association is illegal (12.3(9)). Exclude named
1493 -- associations that are generated for a nested instance.
1496 and then Is_Named_Assoc
1497 and then Comes_From_Source (Found_Assoc)
1499 Check_Overloaded_Formal_Subprogram (Formal);
1502 -- If there is no corresponding actual, this may be case of
1503 -- partial parametrization, or else the formal has a default
1506 if No (Match) and then Partial_Parametrization then
1507 Process_Default (Formal);
1509 if Nkind (I_Node) = N_Formal_Package_Declaration then
1510 Check_Overloaded_Formal_Subprogram (Formal);
1515 Instantiate_Formal_Subprogram
1516 (Formal, Match, Analyzed_Formal));
1518 -- An instantiation is a freeze point for the actuals,
1519 -- unless this is a rewritten formal package.
1521 if Nkind (I_Node) /= N_Formal_Package_Declaration
1522 and then Nkind (Match) = N_Identifier
1523 and then Is_Subprogram (Entity (Match))
1525 -- The actual subprogram may rename a routine defined
1526 -- in Standard. Avoid freezing such renamings because
1527 -- subprograms coming from Standard cannot be frozen.
1530 not Renames_Standard_Subprogram (Entity (Match))
1532 -- If the actual subprogram comes from a different
1533 -- unit, it is already frozen, either by a body in
1534 -- that unit or by the end of the declarative part
1535 -- of the unit. This check avoids the freezing of
1536 -- subprograms defined in Standard which are used
1537 -- as generic actuals.
1539 and then In_Same_Code_Unit (Entity (Match), I_Node)
1540 and then Has_Fully_Defined_Profile (Entity (Match))
1542 -- Mark the subprogram as having a delayed freeze
1543 -- since this may be an out-of-order action.
1545 Set_Has_Delayed_Freeze (Entity (Match));
1546 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1550 -- If this is a nested generic, preserve default for later
1554 and then Box_Present (Formal)
1557 (Defining_Unit_Name (Specification (Last (Assoc))),
1561 when N_Formal_Package_Declaration =>
1564 Defining_Identifier (Formal),
1565 Defining_Identifier (Original_Node (Analyzed_Formal)));
1568 if Partial_Parametrization then
1569 Process_Default (Formal);
1572 Error_Msg_Sloc := Sloc (Gen_Unit);
1575 Instantiation_Node, Defining_Identifier (Formal));
1576 Error_Msg_NE ("\in instantiation of & declared#",
1577 Instantiation_Node, Gen_Unit);
1579 Abandon_Instantiation (Instantiation_Node);
1585 (Instantiate_Formal_Package
1586 (Formal, Match, Analyzed_Formal),
1590 -- For use type and use package appearing in the generic part,
1591 -- we have already copied them, so we can just move them where
1592 -- they belong (we mustn't recopy them since this would mess up
1593 -- the Sloc values).
1595 when N_Use_Package_Clause |
1596 N_Use_Type_Clause =>
1597 if Nkind (Original_Node (I_Node)) =
1598 N_Formal_Package_Declaration
1600 Append (New_Copy_Tree (Formal), Assoc);
1603 Append (Formal, Assoc);
1607 raise Program_Error;
1611 Formal := Saved_Formal;
1612 Next_Non_Pragma (Analyzed_Formal);
1615 if Num_Actuals > Num_Matched then
1616 Error_Msg_Sloc := Sloc (Gen_Unit);
1618 if Present (Selector_Name (Actual)) then
1620 ("unmatched actual&",
1621 Actual, Selector_Name (Actual));
1622 Error_Msg_NE ("\in instantiation of& declared#",
1626 ("unmatched actual in instantiation of& declared#",
1631 elsif Present (Actuals) then
1633 ("too many actuals in generic instantiation", Instantiation_Node);
1636 -- An instantiation freezes all generic actuals. The only exceptions
1637 -- to this are incomplete types and subprograms which are not fully
1638 -- defined at the point of instantiation.
1641 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze);
1643 while Present (Elmt) loop
1644 Freeze_Before (I_Node, Node (Elmt));
1649 -- If there are default subprograms, normalize the tree by adding
1650 -- explicit associations for them. This is required if the instance
1651 -- appears within a generic.
1659 Elmt := First_Elmt (Default_Actuals);
1660 while Present (Elmt) loop
1661 if No (Actuals) then
1662 Actuals := New_List;
1663 Set_Generic_Associations (I_Node, Actuals);
1666 Subp := Node (Elmt);
1668 Make_Generic_Association (Sloc (Subp),
1669 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1670 Explicit_Generic_Actual_Parameter =>
1671 New_Occurrence_Of (Subp, Sloc (Subp)));
1672 Mark_Rewrite_Insertion (New_D);
1673 Append_To (Actuals, New_D);
1678 -- If this is a formal package, normalize the parameter list by adding
1679 -- explicit box associations for the formals that are covered by an
1682 if not Is_Empty_List (Default_Formals) then
1683 Append_List (Default_Formals, Formals);
1687 end Analyze_Associations;
1689 -------------------------------
1690 -- Analyze_Formal_Array_Type --
1691 -------------------------------
1693 procedure Analyze_Formal_Array_Type
1694 (T : in out Entity_Id;
1700 -- Treated like a non-generic array declaration, with additional
1705 if Nkind (Def) = N_Constrained_Array_Definition then
1706 DSS := First (Discrete_Subtype_Definitions (Def));
1707 while Present (DSS) loop
1708 if Nkind_In (DSS, N_Subtype_Indication,
1710 N_Attribute_Reference)
1712 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1719 Array_Type_Declaration (T, Def);
1720 Set_Is_Generic_Type (Base_Type (T));
1722 if Ekind (Component_Type (T)) = E_Incomplete_Type
1723 and then No (Full_View (Component_Type (T)))
1725 Error_Msg_N ("premature usage of incomplete type", Def);
1727 -- Check that range constraint is not allowed on the component type
1728 -- of a generic formal array type (AARM 12.5.3(3))
1730 elsif Is_Internal (Component_Type (T))
1731 and then Present (Subtype_Indication (Component_Definition (Def)))
1732 and then Nkind (Original_Node
1733 (Subtype_Indication (Component_Definition (Def)))) =
1734 N_Subtype_Indication
1737 ("in a formal, a subtype indication can only be "
1738 & "a subtype mark (RM 12.5.3(3))",
1739 Subtype_Indication (Component_Definition (Def)));
1742 end Analyze_Formal_Array_Type;
1744 ---------------------------------------------
1745 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1746 ---------------------------------------------
1748 -- As for other generic types, we create a valid type representation with
1749 -- legal but arbitrary attributes, whose values are never considered
1750 -- static. For all scalar types we introduce an anonymous base type, with
1751 -- the same attributes. We choose the corresponding integer type to be
1752 -- Standard_Integer.
1753 -- Here and in other similar routines, the Sloc of the generated internal
1754 -- type must be the same as the sloc of the defining identifier of the
1755 -- formal type declaration, to provide proper source navigation.
1757 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1761 Loc : constant Source_Ptr := Sloc (Def);
1763 Base : constant Entity_Id :=
1765 (E_Decimal_Fixed_Point_Type,
1767 Sloc (Defining_Identifier (Parent (Def))), 'G');
1769 Int_Base : constant Entity_Id := Standard_Integer;
1770 Delta_Val : constant Ureal := Ureal_1;
1771 Digs_Val : constant Uint := Uint_6;
1776 Set_Etype (Base, Base);
1777 Set_Size_Info (Base, Int_Base);
1778 Set_RM_Size (Base, RM_Size (Int_Base));
1779 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1780 Set_Digits_Value (Base, Digs_Val);
1781 Set_Delta_Value (Base, Delta_Val);
1782 Set_Small_Value (Base, Delta_Val);
1783 Set_Scalar_Range (Base,
1785 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1786 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1788 Set_Is_Generic_Type (Base);
1789 Set_Parent (Base, Parent (Def));
1791 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1792 Set_Etype (T, Base);
1793 Set_Size_Info (T, Int_Base);
1794 Set_RM_Size (T, RM_Size (Int_Base));
1795 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1796 Set_Digits_Value (T, Digs_Val);
1797 Set_Delta_Value (T, Delta_Val);
1798 Set_Small_Value (T, Delta_Val);
1799 Set_Scalar_Range (T, Scalar_Range (Base));
1800 Set_Is_Constrained (T);
1802 Check_Restriction (No_Fixed_Point, Def);
1803 end Analyze_Formal_Decimal_Fixed_Point_Type;
1805 -------------------------------------------
1806 -- Analyze_Formal_Derived_Interface_Type --
1807 -------------------------------------------
1809 procedure Analyze_Formal_Derived_Interface_Type
1814 Loc : constant Source_Ptr := Sloc (Def);
1817 -- Rewrite as a type declaration of a derived type. This ensures that
1818 -- the interface list and primitive operations are properly captured.
1821 Make_Full_Type_Declaration (Loc,
1822 Defining_Identifier => T,
1823 Type_Definition => Def));
1825 Set_Is_Generic_Type (T);
1826 end Analyze_Formal_Derived_Interface_Type;
1828 ---------------------------------
1829 -- Analyze_Formal_Derived_Type --
1830 ---------------------------------
1832 procedure Analyze_Formal_Derived_Type
1837 Loc : constant Source_Ptr := Sloc (Def);
1838 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1842 Set_Is_Generic_Type (T);
1844 if Private_Present (Def) then
1846 Make_Private_Extension_Declaration (Loc,
1847 Defining_Identifier => T,
1848 Discriminant_Specifications => Discriminant_Specifications (N),
1849 Unknown_Discriminants_Present => Unk_Disc,
1850 Subtype_Indication => Subtype_Mark (Def),
1851 Interface_List => Interface_List (Def));
1853 Set_Abstract_Present (New_N, Abstract_Present (Def));
1854 Set_Limited_Present (New_N, Limited_Present (Def));
1855 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1859 Make_Full_Type_Declaration (Loc,
1860 Defining_Identifier => T,
1861 Discriminant_Specifications =>
1862 Discriminant_Specifications (Parent (T)),
1864 Make_Derived_Type_Definition (Loc,
1865 Subtype_Indication => Subtype_Mark (Def)));
1867 Set_Abstract_Present
1868 (Type_Definition (New_N), Abstract_Present (Def));
1870 (Type_Definition (New_N), Limited_Present (Def));
1877 if not Is_Composite_Type (T) then
1879 ("unknown discriminants not allowed for elementary types", N);
1881 Set_Has_Unknown_Discriminants (T);
1882 Set_Is_Constrained (T, False);
1886 -- If the parent type has a known size, so does the formal, which makes
1887 -- legal representation clauses that involve the formal.
1889 Set_Size_Known_At_Compile_Time
1890 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1891 end Analyze_Formal_Derived_Type;
1893 ----------------------------------
1894 -- Analyze_Formal_Discrete_Type --
1895 ----------------------------------
1897 -- The operations defined for a discrete types are those of an enumeration
1898 -- type. The size is set to an arbitrary value, for use in analyzing the
1901 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1902 Loc : constant Source_Ptr := Sloc (Def);
1906 Base : constant Entity_Id :=
1908 (E_Floating_Point_Type, Current_Scope,
1909 Sloc (Defining_Identifier (Parent (Def))), 'G');
1913 Set_Ekind (T, E_Enumeration_Subtype);
1914 Set_Etype (T, Base);
1917 Set_Is_Generic_Type (T);
1918 Set_Is_Constrained (T);
1920 -- For semantic analysis, the bounds of the type must be set to some
1921 -- non-static value. The simplest is to create attribute nodes for those
1922 -- bounds, that refer to the type itself. These bounds are never
1923 -- analyzed but serve as place-holders.
1926 Make_Attribute_Reference (Loc,
1927 Attribute_Name => Name_First,
1928 Prefix => New_Reference_To (T, Loc));
1932 Make_Attribute_Reference (Loc,
1933 Attribute_Name => Name_Last,
1934 Prefix => New_Reference_To (T, Loc));
1937 Set_Scalar_Range (T,
1942 Set_Ekind (Base, E_Enumeration_Type);
1943 Set_Etype (Base, Base);
1944 Init_Size (Base, 8);
1945 Init_Alignment (Base);
1946 Set_Is_Generic_Type (Base);
1947 Set_Scalar_Range (Base, Scalar_Range (T));
1948 Set_Parent (Base, Parent (Def));
1949 end Analyze_Formal_Discrete_Type;
1951 ----------------------------------
1952 -- Analyze_Formal_Floating_Type --
1953 ---------------------------------
1955 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1956 Base : constant Entity_Id :=
1958 (E_Floating_Point_Type, Current_Scope,
1959 Sloc (Defining_Identifier (Parent (Def))), 'G');
1962 -- The various semantic attributes are taken from the predefined type
1963 -- Float, just so that all of them are initialized. Their values are
1964 -- never used because no constant folding or expansion takes place in
1965 -- the generic itself.
1968 Set_Ekind (T, E_Floating_Point_Subtype);
1969 Set_Etype (T, Base);
1970 Set_Size_Info (T, (Standard_Float));
1971 Set_RM_Size (T, RM_Size (Standard_Float));
1972 Set_Digits_Value (T, Digits_Value (Standard_Float));
1973 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1974 Set_Is_Constrained (T);
1976 Set_Is_Generic_Type (Base);
1977 Set_Etype (Base, Base);
1978 Set_Size_Info (Base, (Standard_Float));
1979 Set_RM_Size (Base, RM_Size (Standard_Float));
1980 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1981 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1982 Set_Parent (Base, Parent (Def));
1984 Check_Restriction (No_Floating_Point, Def);
1985 end Analyze_Formal_Floating_Type;
1987 -----------------------------------
1988 -- Analyze_Formal_Interface_Type;--
1989 -----------------------------------
1991 procedure Analyze_Formal_Interface_Type
1996 Loc : constant Source_Ptr := Sloc (N);
2001 Make_Full_Type_Declaration (Loc,
2002 Defining_Identifier => T,
2003 Type_Definition => Def);
2007 Set_Is_Generic_Type (T);
2008 end Analyze_Formal_Interface_Type;
2010 ---------------------------------
2011 -- Analyze_Formal_Modular_Type --
2012 ---------------------------------
2014 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
2016 -- Apart from their entity kind, generic modular types are treated like
2017 -- signed integer types, and have the same attributes.
2019 Analyze_Formal_Signed_Integer_Type (T, Def);
2020 Set_Ekind (T, E_Modular_Integer_Subtype);
2021 Set_Ekind (Etype (T), E_Modular_Integer_Type);
2023 end Analyze_Formal_Modular_Type;
2025 ---------------------------------------
2026 -- Analyze_Formal_Object_Declaration --
2027 ---------------------------------------
2029 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
2030 E : constant Node_Id := Default_Expression (N);
2031 Id : constant Node_Id := Defining_Identifier (N);
2038 -- Determine the mode of the formal object
2040 if Out_Present (N) then
2041 K := E_Generic_In_Out_Parameter;
2043 if not In_Present (N) then
2044 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
2048 K := E_Generic_In_Parameter;
2051 if Present (Subtype_Mark (N)) then
2052 Find_Type (Subtype_Mark (N));
2053 T := Entity (Subtype_Mark (N));
2055 -- Verify that there is no redundant null exclusion
2057 if Null_Exclusion_Present (N) then
2058 if not Is_Access_Type (T) then
2060 ("null exclusion can only apply to an access type", N);
2062 elsif Can_Never_Be_Null (T) then
2064 ("`NOT NULL` not allowed (& already excludes null)",
2069 -- Ada 2005 (AI-423): Formal object with an access definition
2072 Check_Access_Definition (N);
2073 T := Access_Definition
2075 N => Access_Definition (N));
2078 if Ekind (T) = E_Incomplete_Type then
2080 Error_Node : Node_Id;
2083 if Present (Subtype_Mark (N)) then
2084 Error_Node := Subtype_Mark (N);
2086 Check_Access_Definition (N);
2087 Error_Node := Access_Definition (N);
2090 Error_Msg_N ("premature usage of incomplete type", Error_Node);
2094 if K = E_Generic_In_Parameter then
2096 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2098 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
2100 ("generic formal of mode IN must not be of limited type", N);
2101 Explain_Limited_Type (T, N);
2104 if Is_Abstract_Type (T) then
2106 ("generic formal of mode IN must not be of abstract type", N);
2110 Preanalyze_Spec_Expression (E, T);
2112 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
2114 ("initialization not allowed for limited types", E);
2115 Explain_Limited_Type (T, E);
2122 -- Case of generic IN OUT parameter
2125 -- If the formal has an unconstrained type, construct its actual
2126 -- subtype, as is done for subprogram formals. In this fashion, all
2127 -- its uses can refer to specific bounds.
2132 if (Is_Array_Type (T)
2133 and then not Is_Constrained (T))
2135 (Ekind (T) = E_Record_Type
2136 and then Has_Discriminants (T))
2139 Non_Freezing_Ref : constant Node_Id :=
2140 New_Reference_To (Id, Sloc (Id));
2144 -- Make sure the actual subtype doesn't generate bogus freezing
2146 Set_Must_Not_Freeze (Non_Freezing_Ref);
2147 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
2148 Insert_Before_And_Analyze (N, Decl);
2149 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
2152 Set_Actual_Subtype (Id, T);
2157 ("initialization not allowed for `IN OUT` formals", N);
2161 if Has_Aspects (N) then
2162 Analyze_Aspect_Specifications (N, Id);
2164 end Analyze_Formal_Object_Declaration;
2166 ----------------------------------------------
2167 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2168 ----------------------------------------------
2170 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2174 Loc : constant Source_Ptr := Sloc (Def);
2175 Base : constant Entity_Id :=
2177 (E_Ordinary_Fixed_Point_Type, Current_Scope,
2178 Sloc (Defining_Identifier (Parent (Def))), 'G');
2181 -- The semantic attributes are set for completeness only, their values
2182 -- will never be used, since all properties of the type are non-static.
2185 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
2186 Set_Etype (T, Base);
2187 Set_Size_Info (T, Standard_Integer);
2188 Set_RM_Size (T, RM_Size (Standard_Integer));
2189 Set_Small_Value (T, Ureal_1);
2190 Set_Delta_Value (T, Ureal_1);
2191 Set_Scalar_Range (T,
2193 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
2194 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
2195 Set_Is_Constrained (T);
2197 Set_Is_Generic_Type (Base);
2198 Set_Etype (Base, Base);
2199 Set_Size_Info (Base, Standard_Integer);
2200 Set_RM_Size (Base, RM_Size (Standard_Integer));
2201 Set_Small_Value (Base, Ureal_1);
2202 Set_Delta_Value (Base, Ureal_1);
2203 Set_Scalar_Range (Base, Scalar_Range (T));
2204 Set_Parent (Base, Parent (Def));
2206 Check_Restriction (No_Fixed_Point, Def);
2207 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2209 ----------------------------------------
2210 -- Analyze_Formal_Package_Declaration --
2211 ----------------------------------------
2213 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2214 Loc : constant Source_Ptr := Sloc (N);
2215 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2217 Gen_Id : constant Node_Id := Name (N);
2219 Gen_Unit : Entity_Id;
2221 Parent_Installed : Boolean := False;
2223 Parent_Instance : Entity_Id;
2224 Renaming_In_Par : Entity_Id;
2225 Associations : Boolean := True;
2227 Vis_Prims_List : Elist_Id := No_Elist;
2228 -- List of primitives made temporarily visible in the instantiation
2229 -- to match the visibility of the formal type
2231 function Build_Local_Package return Node_Id;
2232 -- The formal package is rewritten so that its parameters are replaced
2233 -- with corresponding declarations. For parameters with bona fide
2234 -- associations these declarations are created by Analyze_Associations
2235 -- as for a regular instantiation. For boxed parameters, we preserve
2236 -- the formal declarations and analyze them, in order to introduce
2237 -- entities of the right kind in the environment of the formal.
2239 -------------------------
2240 -- Build_Local_Package --
2241 -------------------------
2243 function Build_Local_Package return Node_Id is
2245 Pack_Decl : Node_Id;
2248 -- Within the formal, the name of the generic package is a renaming
2249 -- of the formal (as for a regular instantiation).
2252 Make_Package_Declaration (Loc,
2255 (Specification (Original_Node (Gen_Decl)),
2256 Empty, Instantiating => True));
2258 Renaming := Make_Package_Renaming_Declaration (Loc,
2259 Defining_Unit_Name =>
2260 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2261 Name => New_Occurrence_Of (Formal, Loc));
2263 if Nkind (Gen_Id) = N_Identifier
2264 and then Chars (Gen_Id) = Chars (Pack_Id)
2267 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2270 -- If the formal is declared with a box, or with an others choice,
2271 -- create corresponding declarations for all entities in the formal
2272 -- part, so that names with the proper types are available in the
2273 -- specification of the formal package.
2275 -- On the other hand, if there are no associations, then all the
2276 -- formals must have defaults, and this will be checked by the
2277 -- call to Analyze_Associations.
2280 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2283 Formal_Decl : Node_Id;
2286 -- TBA : for a formal package, need to recurse ???
2291 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2292 while Present (Formal_Decl) loop
2294 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2299 -- If generic associations are present, use Analyze_Associations to
2300 -- create the proper renaming declarations.
2304 Act_Tree : constant Node_Id :=
2306 (Original_Node (Gen_Decl), Empty,
2307 Instantiating => True);
2310 Generic_Renamings.Set_Last (0);
2311 Generic_Renamings_HTable.Reset;
2312 Instantiation_Node := N;
2315 Analyze_Associations
2316 (I_Node => Original_Node (N),
2317 Formals => Generic_Formal_Declarations (Act_Tree),
2318 F_Copy => Generic_Formal_Declarations (Gen_Decl));
2320 Vis_Prims_List := Check_Hidden_Primitives (Decls);
2324 Append (Renaming, To => Decls);
2326 -- Add generated declarations ahead of local declarations in
2329 if No (Visible_Declarations (Specification (Pack_Decl))) then
2330 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2333 (First (Visible_Declarations (Specification (Pack_Decl))),
2338 end Build_Local_Package;
2340 -- Start of processing for Analyze_Formal_Package_Declaration
2343 Text_IO_Kludge (Gen_Id);
2346 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2347 Gen_Unit := Entity (Gen_Id);
2349 -- Check for a formal package that is a package renaming
2351 if Present (Renamed_Object (Gen_Unit)) then
2353 -- Indicate that unit is used, before replacing it with renamed
2354 -- entity for use below.
2356 if In_Extended_Main_Source_Unit (N) then
2357 Set_Is_Instantiated (Gen_Unit);
2358 Generate_Reference (Gen_Unit, N);
2361 Gen_Unit := Renamed_Object (Gen_Unit);
2364 if Ekind (Gen_Unit) /= E_Generic_Package then
2365 Error_Msg_N ("expect generic package name", Gen_Id);
2369 elsif Gen_Unit = Current_Scope then
2371 ("generic package cannot be used as a formal package of itself",
2376 elsif In_Open_Scopes (Gen_Unit) then
2377 if Is_Compilation_Unit (Gen_Unit)
2378 and then Is_Child_Unit (Current_Scope)
2380 -- Special-case the error when the formal is a parent, and
2381 -- continue analysis to minimize cascaded errors.
2384 ("generic parent cannot be used as formal package "
2385 & "of a child unit",
2390 ("generic package cannot be used as a formal package "
2398 -- Check that name of formal package does not hide name of generic,
2399 -- or its leading prefix. This check must be done separately because
2400 -- the name of the generic has already been analyzed.
2403 Gen_Name : Entity_Id;
2407 while Nkind (Gen_Name) = N_Expanded_Name loop
2408 Gen_Name := Prefix (Gen_Name);
2411 if Chars (Gen_Name) = Chars (Pack_Id) then
2413 ("& is hidden within declaration of formal package",
2419 or else No (Generic_Associations (N))
2420 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2422 Associations := False;
2425 -- If there are no generic associations, the generic parameters appear
2426 -- as local entities and are instantiated like them. We copy the generic
2427 -- package declaration as if it were an instantiation, and analyze it
2428 -- like a regular package, except that we treat the formals as
2429 -- additional visible components.
2431 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2433 if In_Extended_Main_Source_Unit (N) then
2434 Set_Is_Instantiated (Gen_Unit);
2435 Generate_Reference (Gen_Unit, N);
2438 Formal := New_Copy (Pack_Id);
2439 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2442 -- Make local generic without formals. The formals will be replaced
2443 -- with internal declarations.
2445 New_N := Build_Local_Package;
2447 -- If there are errors in the parameter list, Analyze_Associations
2448 -- raises Instantiation_Error. Patch the declaration to prevent
2449 -- further exception propagation.
2452 when Instantiation_Error =>
2454 Enter_Name (Formal);
2455 Set_Ekind (Formal, E_Variable);
2456 Set_Etype (Formal, Any_Type);
2457 Restore_Hidden_Primitives (Vis_Prims_List);
2459 if Parent_Installed then
2467 Set_Defining_Unit_Name (Specification (New_N), Formal);
2468 Set_Generic_Parent (Specification (N), Gen_Unit);
2469 Set_Instance_Env (Gen_Unit, Formal);
2470 Set_Is_Generic_Instance (Formal);
2472 Enter_Name (Formal);
2473 Set_Ekind (Formal, E_Package);
2474 Set_Etype (Formal, Standard_Void_Type);
2475 Set_Inner_Instances (Formal, New_Elmt_List);
2476 Push_Scope (Formal);
2478 if Is_Child_Unit (Gen_Unit)
2479 and then Parent_Installed
2481 -- Similarly, we have to make the name of the formal visible in the
2482 -- parent instance, to resolve properly fully qualified names that
2483 -- may appear in the generic unit. The parent instance has been
2484 -- placed on the scope stack ahead of the current scope.
2486 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2489 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2490 Set_Ekind (Renaming_In_Par, E_Package);
2491 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2492 Set_Scope (Renaming_In_Par, Parent_Instance);
2493 Set_Parent (Renaming_In_Par, Parent (Formal));
2494 Set_Renamed_Object (Renaming_In_Par, Formal);
2495 Append_Entity (Renaming_In_Par, Parent_Instance);
2498 Analyze (Specification (N));
2500 -- The formals for which associations are provided are not visible
2501 -- outside of the formal package. The others are still declared by a
2502 -- formal parameter declaration.
2504 -- If there are no associations, the only local entity to hide is the
2505 -- generated package renaming itself.
2511 E := First_Entity (Formal);
2512 while Present (E) loop
2514 and then not Is_Generic_Formal (E)
2519 if Ekind (E) = E_Package
2520 and then Renamed_Entity (E) = Formal
2530 End_Package_Scope (Formal);
2531 Restore_Hidden_Primitives (Vis_Prims_List);
2533 if Parent_Installed then
2539 -- Inside the generic unit, the formal package is a regular package, but
2540 -- no body is needed for it. Note that after instantiation, the defining
2541 -- unit name we need is in the new tree and not in the original (see
2542 -- Package_Instantiation). A generic formal package is an instance, and
2543 -- can be used as an actual for an inner instance.
2545 Set_Has_Completion (Formal, True);
2547 -- Add semantic information to the original defining identifier.
2550 Set_Ekind (Pack_Id, E_Package);
2551 Set_Etype (Pack_Id, Standard_Void_Type);
2552 Set_Scope (Pack_Id, Scope (Formal));
2553 Set_Has_Completion (Pack_Id, True);
2556 if Has_Aspects (N) then
2557 Analyze_Aspect_Specifications (N, Pack_Id);
2559 end Analyze_Formal_Package_Declaration;
2561 ---------------------------------
2562 -- Analyze_Formal_Private_Type --
2563 ---------------------------------
2565 procedure Analyze_Formal_Private_Type
2571 New_Private_Type (N, T, Def);
2573 -- Set the size to an arbitrary but legal value
2575 Set_Size_Info (T, Standard_Integer);
2576 Set_RM_Size (T, RM_Size (Standard_Integer));
2577 end Analyze_Formal_Private_Type;
2579 ------------------------------------
2580 -- Analyze_Formal_Incomplete_Type --
2581 ------------------------------------
2583 procedure Analyze_Formal_Incomplete_Type
2589 Set_Ekind (T, E_Incomplete_Type);
2591 Set_Private_Dependents (T, New_Elmt_List);
2593 if Tagged_Present (Def) then
2594 Set_Is_Tagged_Type (T);
2595 Make_Class_Wide_Type (T);
2596 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2598 end Analyze_Formal_Incomplete_Type;
2600 ----------------------------------------
2601 -- Analyze_Formal_Signed_Integer_Type --
2602 ----------------------------------------
2604 procedure Analyze_Formal_Signed_Integer_Type
2608 Base : constant Entity_Id :=
2610 (E_Signed_Integer_Type,
2612 Sloc (Defining_Identifier (Parent (Def))), 'G');
2617 Set_Ekind (T, E_Signed_Integer_Subtype);
2618 Set_Etype (T, Base);
2619 Set_Size_Info (T, Standard_Integer);
2620 Set_RM_Size (T, RM_Size (Standard_Integer));
2621 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2622 Set_Is_Constrained (T);
2624 Set_Is_Generic_Type (Base);
2625 Set_Size_Info (Base, Standard_Integer);
2626 Set_RM_Size (Base, RM_Size (Standard_Integer));
2627 Set_Etype (Base, Base);
2628 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2629 Set_Parent (Base, Parent (Def));
2630 end Analyze_Formal_Signed_Integer_Type;
2632 -------------------------------------------
2633 -- Analyze_Formal_Subprogram_Declaration --
2634 -------------------------------------------
2636 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2637 Spec : constant Node_Id := Specification (N);
2638 Def : constant Node_Id := Default_Name (N);
2639 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2647 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2648 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2652 Analyze_Subprogram_Declaration (N);
2653 Set_Is_Formal_Subprogram (Nam);
2654 Set_Has_Completion (Nam);
2656 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2657 Set_Is_Abstract_Subprogram (Nam);
2658 Set_Is_Dispatching_Operation (Nam);
2661 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2663 if No (Ctrl_Type) then
2665 ("abstract formal subprogram must have a controlling type",
2668 Check_Controlling_Formals (Ctrl_Type, Nam);
2673 -- Default name is resolved at the point of instantiation
2675 if Box_Present (N) then
2678 -- Else default is bound at the point of generic declaration
2680 elsif Present (Def) then
2681 if Nkind (Def) = N_Operator_Symbol then
2682 Find_Direct_Name (Def);
2684 elsif Nkind (Def) /= N_Attribute_Reference then
2688 -- For an attribute reference, analyze the prefix and verify
2689 -- that it has the proper profile for the subprogram.
2691 Analyze (Prefix (Def));
2692 Valid_Default_Attribute (Nam, Def);
2696 -- Default name may be overloaded, in which case the interpretation
2697 -- with the correct profile must be selected, as for a renaming.
2698 -- If the definition is an indexed component, it must denote a
2699 -- member of an entry family. If it is a selected component, it
2700 -- can be a protected operation.
2702 if Etype (Def) = Any_Type then
2705 elsif Nkind (Def) = N_Selected_Component then
2706 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2707 Error_Msg_N ("expect valid subprogram name as default", Def);
2710 elsif Nkind (Def) = N_Indexed_Component then
2711 if Is_Entity_Name (Prefix (Def)) then
2712 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2713 Error_Msg_N ("expect valid subprogram name as default", Def);
2716 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2717 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2720 Error_Msg_N ("expect valid subprogram name as default", Def);
2724 Error_Msg_N ("expect valid subprogram name as default", Def);
2728 elsif Nkind (Def) = N_Character_Literal then
2730 -- Needs some type checks: subprogram should be parameterless???
2732 Resolve (Def, (Etype (Nam)));
2734 elsif not Is_Entity_Name (Def)
2735 or else not Is_Overloadable (Entity (Def))
2737 Error_Msg_N ("expect valid subprogram name as default", Def);
2740 elsif not Is_Overloaded (Def) then
2741 Subp := Entity (Def);
2744 Error_Msg_N ("premature usage of formal subprogram", Def);
2746 elsif not Entity_Matches_Spec (Subp, Nam) then
2747 Error_Msg_N ("no visible entity matches specification", Def);
2750 -- More than one interpretation, so disambiguate as for a renaming
2755 I1 : Interp_Index := 0;
2761 Get_First_Interp (Def, I, It);
2762 while Present (It.Nam) loop
2763 if Entity_Matches_Spec (It.Nam, Nam) then
2764 if Subp /= Any_Id then
2765 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2767 if It1 = No_Interp then
2768 Error_Msg_N ("ambiguous default subprogram", Def);
2781 Get_Next_Interp (I, It);
2785 if Subp /= Any_Id then
2787 -- Subprogram found, generate reference to it
2789 Set_Entity (Def, Subp);
2790 Generate_Reference (Subp, Def);
2793 Error_Msg_N ("premature usage of formal subprogram", Def);
2795 elsif Ekind (Subp) /= E_Operator then
2796 Check_Mode_Conformant (Subp, Nam);
2800 Error_Msg_N ("no visible subprogram matches specification", N);
2806 if Has_Aspects (N) then
2807 Analyze_Aspect_Specifications (N, Nam);
2810 end Analyze_Formal_Subprogram_Declaration;
2812 -------------------------------------
2813 -- Analyze_Formal_Type_Declaration --
2814 -------------------------------------
2816 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2817 Def : constant Node_Id := Formal_Type_Definition (N);
2821 T := Defining_Identifier (N);
2823 if Present (Discriminant_Specifications (N))
2824 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2827 ("discriminants not allowed for this formal type", T);
2830 -- Enter the new name, and branch to specific routine
2833 when N_Formal_Private_Type_Definition =>
2834 Analyze_Formal_Private_Type (N, T, Def);
2836 when N_Formal_Derived_Type_Definition =>
2837 Analyze_Formal_Derived_Type (N, T, Def);
2839 when N_Formal_Incomplete_Type_Definition =>
2840 Analyze_Formal_Incomplete_Type (T, Def);
2842 when N_Formal_Discrete_Type_Definition =>
2843 Analyze_Formal_Discrete_Type (T, Def);
2845 when N_Formal_Signed_Integer_Type_Definition =>
2846 Analyze_Formal_Signed_Integer_Type (T, Def);
2848 when N_Formal_Modular_Type_Definition =>
2849 Analyze_Formal_Modular_Type (T, Def);
2851 when N_Formal_Floating_Point_Definition =>
2852 Analyze_Formal_Floating_Type (T, Def);
2854 when N_Formal_Ordinary_Fixed_Point_Definition =>
2855 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2857 when N_Formal_Decimal_Fixed_Point_Definition =>
2858 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2860 when N_Array_Type_Definition =>
2861 Analyze_Formal_Array_Type (T, Def);
2863 when N_Access_To_Object_Definition |
2864 N_Access_Function_Definition |
2865 N_Access_Procedure_Definition =>
2866 Analyze_Generic_Access_Type (T, Def);
2868 -- Ada 2005: a interface declaration is encoded as an abstract
2869 -- record declaration or a abstract type derivation.
2871 when N_Record_Definition =>
2872 Analyze_Formal_Interface_Type (N, T, Def);
2874 when N_Derived_Type_Definition =>
2875 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2881 raise Program_Error;
2885 Set_Is_Generic_Type (T);
2887 if Has_Aspects (N) then
2888 Analyze_Aspect_Specifications (N, T);
2890 end Analyze_Formal_Type_Declaration;
2892 ------------------------------------
2893 -- Analyze_Function_Instantiation --
2894 ------------------------------------
2896 procedure Analyze_Function_Instantiation (N : Node_Id) is
2898 Analyze_Subprogram_Instantiation (N, E_Function);
2899 end Analyze_Function_Instantiation;
2901 ---------------------------------
2902 -- Analyze_Generic_Access_Type --
2903 ---------------------------------
2905 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2909 if Nkind (Def) = N_Access_To_Object_Definition then
2910 Access_Type_Declaration (T, Def);
2912 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2913 and then No (Full_View (Designated_Type (T)))
2914 and then not Is_Generic_Type (Designated_Type (T))
2916 Error_Msg_N ("premature usage of incomplete type", Def);
2918 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2920 ("only a subtype mark is allowed in a formal", Def);
2924 Access_Subprogram_Declaration (T, Def);
2926 end Analyze_Generic_Access_Type;
2928 ---------------------------------
2929 -- Analyze_Generic_Formal_Part --
2930 ---------------------------------
2932 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2933 Gen_Parm_Decl : Node_Id;
2936 -- The generic formals are processed in the scope of the generic unit,
2937 -- where they are immediately visible. The scope is installed by the
2940 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2942 while Present (Gen_Parm_Decl) loop
2943 Analyze (Gen_Parm_Decl);
2944 Next (Gen_Parm_Decl);
2947 Generate_Reference_To_Generic_Formals (Current_Scope);
2948 end Analyze_Generic_Formal_Part;
2950 ------------------------------------------
2951 -- Analyze_Generic_Package_Declaration --
2952 ------------------------------------------
2954 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2955 Loc : constant Source_Ptr := Sloc (N);
2958 Save_Parent : Node_Id;
2960 Decls : constant List_Id :=
2961 Visible_Declarations (Specification (N));
2965 Check_SPARK_Restriction ("generic is not allowed", N);
2967 -- We introduce a renaming of the enclosing package, to have a usable
2968 -- entity as the prefix of an expanded name for a local entity of the
2969 -- form Par.P.Q, where P is the generic package. This is because a local
2970 -- entity named P may hide it, so that the usual visibility rules in
2971 -- the instance will not resolve properly.
2974 Make_Package_Renaming_Declaration (Loc,
2975 Defining_Unit_Name =>
2976 Make_Defining_Identifier (Loc,
2977 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2978 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2980 if Present (Decls) then
2981 Decl := First (Decls);
2982 while Present (Decl)
2983 and then Nkind (Decl) = N_Pragma
2988 if Present (Decl) then
2989 Insert_Before (Decl, Renaming);
2991 Append (Renaming, Visible_Declarations (Specification (N)));
2995 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2998 -- Create copy of generic unit, and save for instantiation. If the unit
2999 -- is a child unit, do not copy the specifications for the parent, which
3000 -- are not part of the generic tree.
3002 Save_Parent := Parent_Spec (N);
3003 Set_Parent_Spec (N, Empty);
3005 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3006 Set_Parent_Spec (New_N, Save_Parent);
3008 Id := Defining_Entity (N);
3009 Generate_Definition (Id);
3011 -- Expansion is not applied to generic units
3016 Set_Ekind (Id, E_Generic_Package);
3017 Set_Etype (Id, Standard_Void_Type);
3019 Enter_Generic_Scope (Id);
3020 Set_Inner_Instances (Id, New_Elmt_List);
3022 Set_Categorization_From_Pragmas (N);
3023 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3025 -- Link the declaration of the generic homonym in the generic copy to
3026 -- the package it renames, so that it is always resolved properly.
3028 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
3029 Set_Entity (Associated_Node (Name (Renaming)), Id);
3031 -- For a library unit, we have reconstructed the entity for the unit,
3032 -- and must reset it in the library tables.
3034 if Nkind (Parent (N)) = N_Compilation_Unit then
3035 Set_Cunit_Entity (Current_Sem_Unit, Id);
3038 Analyze_Generic_Formal_Part (N);
3040 -- After processing the generic formals, analysis proceeds as for a
3041 -- non-generic package.
3043 Analyze (Specification (N));
3045 Validate_Categorization_Dependency (N, Id);
3049 End_Package_Scope (Id);
3050 Exit_Generic_Scope (Id);
3052 if Nkind (Parent (N)) /= N_Compilation_Unit then
3053 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
3054 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
3055 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
3058 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3059 Validate_RT_RAT_Component (N);
3061 -- If this is a spec without a body, check that generic parameters
3064 if not Body_Required (Parent (N)) then
3065 Check_References (Id);
3069 if Has_Aspects (N) then
3070 Analyze_Aspect_Specifications (N, Id);
3072 end Analyze_Generic_Package_Declaration;
3074 --------------------------------------------
3075 -- Analyze_Generic_Subprogram_Declaration --
3076 --------------------------------------------
3078 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
3083 Result_Type : Entity_Id;
3084 Save_Parent : Node_Id;
3088 Check_SPARK_Restriction ("generic is not allowed", N);
3090 -- Create copy of generic unit, and save for instantiation. If the unit
3091 -- is a child unit, do not copy the specifications for the parent, which
3092 -- are not part of the generic tree.
3094 Save_Parent := Parent_Spec (N);
3095 Set_Parent_Spec (N, Empty);
3097 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3098 Set_Parent_Spec (New_N, Save_Parent);
3101 -- The aspect specifications are not attached to the tree, and must
3102 -- be copied and attached to the generic copy explicitly.
3104 if Present (Aspect_Specifications (New_N)) then
3106 Aspects : constant List_Id := Aspect_Specifications (N);
3108 Set_Has_Aspects (N, False);
3109 Move_Aspects (New_N, N);
3110 Set_Has_Aspects (Original_Node (N), False);
3111 Set_Aspect_Specifications (Original_Node (N), Aspects);
3115 Spec := Specification (N);
3116 Id := Defining_Entity (Spec);
3117 Generate_Definition (Id);
3118 Set_Contract (Id, Make_Contract (Sloc (Id)));
3120 if Nkind (Id) = N_Defining_Operator_Symbol then
3122 ("operator symbol not allowed for generic subprogram", Id);
3129 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
3131 Enter_Generic_Scope (Id);
3132 Set_Inner_Instances (Id, New_Elmt_List);
3133 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3135 Analyze_Generic_Formal_Part (N);
3137 Formals := Parameter_Specifications (Spec);
3139 if Present (Formals) then
3140 Process_Formals (Formals, Spec);
3143 if Nkind (Spec) = N_Function_Specification then
3144 Set_Ekind (Id, E_Generic_Function);
3146 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
3147 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
3148 Set_Etype (Id, Result_Type);
3150 -- Check restriction imposed by AI05-073: a generic function
3151 -- cannot return an abstract type or an access to such.
3153 -- This is a binding interpretation should it apply to earlier
3154 -- versions of Ada as well as Ada 2012???
3156 if Is_Abstract_Type (Designated_Type (Result_Type))
3157 and then Ada_Version >= Ada_2012
3159 Error_Msg_N ("generic function cannot have an access result"
3160 & " that designates an abstract type", Spec);
3164 Find_Type (Result_Definition (Spec));
3165 Typ := Entity (Result_Definition (Spec));
3167 if Is_Abstract_Type (Typ)
3168 and then Ada_Version >= Ada_2012
3171 ("generic function cannot have abstract result type", Spec);
3174 -- If a null exclusion is imposed on the result type, then create
3175 -- a null-excluding itype (an access subtype) and use it as the
3176 -- function's Etype.
3178 if Is_Access_Type (Typ)
3179 and then Null_Exclusion_Present (Spec)
3182 Create_Null_Excluding_Itype
3184 Related_Nod => Spec,
3185 Scope_Id => Defining_Unit_Name (Spec)));
3187 Set_Etype (Id, Typ);
3192 Set_Ekind (Id, E_Generic_Procedure);
3193 Set_Etype (Id, Standard_Void_Type);
3196 -- For a library unit, we have reconstructed the entity for the unit,
3197 -- and must reset it in the library tables. We also make sure that
3198 -- Body_Required is set properly in the original compilation unit node.
3200 if Nkind (Parent (N)) = N_Compilation_Unit then
3201 Set_Cunit_Entity (Current_Sem_Unit, Id);
3202 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3205 Set_Categorization_From_Pragmas (N);
3206 Validate_Categorization_Dependency (N, Id);
3208 Save_Global_References (Original_Node (N));
3210 -- For ASIS purposes, convert any postcondition, precondition pragmas
3211 -- into aspects, if N is not a compilation unit by itself, in order to
3212 -- enable the analysis of expressions inside the corresponding PPC
3215 if ASIS_Mode and then Is_List_Member (N) then
3216 Make_Aspect_For_PPC_In_Gen_Sub_Decl (N);
3219 -- To capture global references, analyze the expressions of aspects,
3220 -- and propagate information to original tree. Note that in this case
3221 -- analysis of attributes is not delayed until the freeze point.
3223 -- It seems very hard to recreate the proper visibility of the generic
3224 -- subprogram at a later point because the analysis of an aspect may
3225 -- create pragmas after the generic copies have been made ???
3227 if Has_Aspects (N) then
3232 Aspect := First (Aspect_Specifications (N));
3233 while Present (Aspect) loop
3234 if Get_Aspect_Id (Chars (Identifier (Aspect)))
3237 Analyze (Expression (Aspect));
3242 Aspect := First (Aspect_Specifications (Original_Node (N)));
3243 while Present (Aspect) loop
3244 Save_Global_References (Expression (Aspect));
3252 Exit_Generic_Scope (Id);
3253 Generate_Reference_To_Formals (Id);
3255 List_Inherited_Pre_Post_Aspects (Id);
3256 end Analyze_Generic_Subprogram_Declaration;
3258 -----------------------------------
3259 -- Analyze_Package_Instantiation --
3260 -----------------------------------
3262 procedure Analyze_Package_Instantiation (N : Node_Id) is
3263 Loc : constant Source_Ptr := Sloc (N);
3264 Gen_Id : constant Node_Id := Name (N);
3267 Act_Decl_Name : Node_Id;
3268 Act_Decl_Id : Entity_Id;
3273 Gen_Unit : Entity_Id;
3275 Is_Actual_Pack : constant Boolean :=
3276 Is_Internal (Defining_Entity (N));
3278 Env_Installed : Boolean := False;
3279 Parent_Installed : Boolean := False;
3280 Renaming_List : List_Id;
3281 Unit_Renaming : Node_Id;
3282 Needs_Body : Boolean;
3283 Inline_Now : Boolean := False;
3285 Save_Style_Check : constant Boolean := Style_Check;
3286 -- Save style check mode for restore on exit
3288 procedure Delay_Descriptors (E : Entity_Id);
3289 -- Delay generation of subprogram descriptors for given entity
3291 function Might_Inline_Subp return Boolean;
3292 -- If inlining is active and the generic contains inlined subprograms,
3293 -- we instantiate the body. This may cause superfluous instantiations,
3294 -- but it is simpler than detecting the need for the body at the point
3295 -- of inlining, when the context of the instance is not available.
3297 function Must_Inline_Subp return Boolean;
3298 -- If inlining is active and the generic contains inlined subprograms,
3299 -- return True if some of the inlined subprograms must be inlined by
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 ----------------------
3342 -- Must_Inline_Subp --
3343 ----------------------
3345 function Must_Inline_Subp return Boolean is
3349 if not Inline_Processing_Required then
3353 E := First_Entity (Gen_Unit);
3354 while Present (E) loop
3355 if Is_Subprogram (E)
3356 and then Is_Inlined (E)
3357 and then Must_Inline (E)
3367 end Must_Inline_Subp;
3369 -- Local declarations
3371 Vis_Prims_List : Elist_Id := No_Elist;
3372 -- List of primitives made temporarily visible in the instantiation
3373 -- to match the visibility of the formal type
3375 -- Start of processing for Analyze_Package_Instantiation
3378 Check_SPARK_Restriction ("generic is not allowed", N);
3380 -- Very first thing: apply the special kludge for Text_IO processing
3381 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3383 Text_IO_Kludge (Name (N));
3385 -- Make node global for error reporting
3387 Instantiation_Node := N;
3389 -- Turn off style checking in instances. If the check is enabled on the
3390 -- generic unit, a warning in an instance would just be noise. If not
3391 -- enabled on the generic, then a warning in an instance is just wrong.
3393 Style_Check := False;
3395 -- Case of instantiation of a generic package
3397 if Nkind (N) = N_Package_Instantiation then
3398 Act_Decl_Id := New_Copy (Defining_Entity (N));
3399 Set_Comes_From_Source (Act_Decl_Id, True);
3401 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3403 Make_Defining_Program_Unit_Name (Loc,
3404 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
3405 Defining_Identifier => Act_Decl_Id);
3407 Act_Decl_Name := Act_Decl_Id;
3410 -- Case of instantiation of a formal package
3413 Act_Decl_Id := Defining_Identifier (N);
3414 Act_Decl_Name := Act_Decl_Id;
3417 Generate_Definition (Act_Decl_Id);
3418 Preanalyze_Actuals (N);
3421 Env_Installed := True;
3423 -- Reset renaming map for formal types. The mapping is established
3424 -- when analyzing the generic associations, but some mappings are
3425 -- inherited from formal packages of parent units, and these are
3426 -- constructed when the parents are installed.
3428 Generic_Renamings.Set_Last (0);
3429 Generic_Renamings_HTable.Reset;
3431 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3432 Gen_Unit := Entity (Gen_Id);
3434 -- Verify that it is the name of a generic package
3436 -- A visibility glitch: if the instance is a child unit and the generic
3437 -- is the generic unit of a parent instance (i.e. both the parent and
3438 -- the child units are instances of the same package) the name now
3439 -- denotes the renaming within the parent, not the intended generic
3440 -- unit. See if there is a homonym that is the desired generic. The
3441 -- renaming declaration must be visible inside the instance of the
3442 -- child, but not when analyzing the name in the instantiation itself.
3444 if Ekind (Gen_Unit) = E_Package
3445 and then Present (Renamed_Entity (Gen_Unit))
3446 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3447 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3448 and then Present (Homonym (Gen_Unit))
3450 Gen_Unit := Homonym (Gen_Unit);
3453 if Etype (Gen_Unit) = Any_Type then
3457 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3459 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3461 if From_With_Type (Gen_Unit) then
3463 ("cannot instantiate a limited withed package", Gen_Id);
3466 ("expect name of generic package in instantiation", Gen_Id);
3473 if In_Extended_Main_Source_Unit (N) then
3474 Set_Is_Instantiated (Gen_Unit);
3475 Generate_Reference (Gen_Unit, N);
3477 if Present (Renamed_Object (Gen_Unit)) then
3478 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3479 Generate_Reference (Renamed_Object (Gen_Unit), N);
3483 if Nkind (Gen_Id) = N_Identifier
3484 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3487 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3489 elsif Nkind (Gen_Id) = N_Expanded_Name
3490 and then Is_Child_Unit (Gen_Unit)
3491 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3492 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3495 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3498 Set_Entity (Gen_Id, Gen_Unit);
3500 -- If generic is a renaming, get original generic unit
3502 if Present (Renamed_Object (Gen_Unit))
3503 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3505 Gen_Unit := Renamed_Object (Gen_Unit);
3508 -- Verify that there are no circular instantiations
3510 if In_Open_Scopes (Gen_Unit) then
3511 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3515 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3516 Error_Msg_Node_2 := Current_Scope;
3518 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3519 Circularity_Detected := True;
3524 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3526 -- Initialize renamings map, for error checking, and the list that
3527 -- holds private entities whose views have changed between generic
3528 -- definition and instantiation. If this is the instance created to
3529 -- validate an actual package, the instantiation environment is that
3530 -- of the enclosing instance.
3532 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3534 -- Copy original generic tree, to produce text for instantiation
3538 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3540 Act_Spec := Specification (Act_Tree);
3542 -- If this is the instance created to validate an actual package,
3543 -- only the formals matter, do not examine the package spec itself.
3545 if Is_Actual_Pack then
3546 Set_Visible_Declarations (Act_Spec, New_List);
3547 Set_Private_Declarations (Act_Spec, New_List);
3551 Analyze_Associations
3553 Formals => Generic_Formal_Declarations (Act_Tree),
3554 F_Copy => Generic_Formal_Declarations (Gen_Decl));
3556 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
3558 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3559 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3560 Set_Is_Generic_Instance (Act_Decl_Id);
3562 Set_Generic_Parent (Act_Spec, Gen_Unit);
3564 -- References to the generic in its own declaration or its body are
3565 -- references to the instance. Add a renaming declaration for the
3566 -- generic unit itself. This declaration, as well as the renaming
3567 -- declarations for the generic formals, must remain private to the
3568 -- unit: the formals, because this is the language semantics, and
3569 -- the unit because its use is an artifact of the implementation.
3572 Make_Package_Renaming_Declaration (Loc,
3573 Defining_Unit_Name =>
3574 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3575 Name => New_Reference_To (Act_Decl_Id, Loc));
3577 Append (Unit_Renaming, Renaming_List);
3579 -- The renaming declarations are the first local declarations of
3582 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3584 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3586 Set_Visible_Declarations (Act_Spec, Renaming_List);
3590 Make_Package_Declaration (Loc,
3591 Specification => Act_Spec);
3593 -- Save the instantiation node, for subsequent instantiation of the
3594 -- body, if there is one and we are generating code for the current
3595 -- unit. Mark the unit as having a body, to avoid a premature error
3598 -- We instantiate the body if we are generating code, if we are
3599 -- generating cross-reference information, or if we are building
3600 -- trees for ASIS use.
3603 Enclosing_Body_Present : Boolean := False;
3604 -- If the generic unit is not a compilation unit, then a body may
3605 -- be present in its parent even if none is required. We create a
3606 -- tentative pending instantiation for the body, which will be
3607 -- discarded if none is actually present.
3612 if Scope (Gen_Unit) /= Standard_Standard
3613 and then not Is_Child_Unit (Gen_Unit)
3615 Scop := Scope (Gen_Unit);
3617 while Present (Scop)
3618 and then Scop /= Standard_Standard
3620 if Unit_Requires_Body (Scop) then
3621 Enclosing_Body_Present := True;
3624 elsif In_Open_Scopes (Scop)
3625 and then In_Package_Body (Scop)
3627 Enclosing_Body_Present := True;
3631 exit when Is_Compilation_Unit (Scop);
3632 Scop := Scope (Scop);
3636 -- If front-end inlining is enabled, and this is a unit for which
3637 -- code will be generated, we instantiate the body at once.
3639 -- This is done if the instance is not the main unit, and if the
3640 -- generic is not a child unit of another generic, to avoid scope
3641 -- problems and the reinstallation of parent instances.
3644 and then (not Is_Child_Unit (Gen_Unit)
3645 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3646 and then Might_Inline_Subp
3647 and then not Is_Actual_Pack
3649 if not Debug_Flag_Dot_K
3650 and then Front_End_Inlining
3651 and then (Is_In_Main_Unit (N)
3652 or else In_Main_Context (Current_Scope))
3653 and then Nkind (Parent (N)) /= N_Compilation_Unit
3657 elsif Debug_Flag_Dot_K
3658 and then Must_Inline_Subp
3659 and then (Is_In_Main_Unit (N)
3660 or else In_Main_Context (Current_Scope))
3661 and then Nkind (Parent (N)) /= N_Compilation_Unit
3665 -- In configurable_run_time mode we force the inlining of
3666 -- predefined subprograms marked Inline_Always, to minimize
3667 -- the use of the run-time library.
3669 elsif Is_Predefined_File_Name
3670 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3671 and then Configurable_Run_Time_Mode
3672 and then Nkind (Parent (N)) /= N_Compilation_Unit
3677 -- If the current scope is itself an instance within a child
3678 -- unit, there will be duplications in the scope stack, and the
3679 -- unstacking mechanism in Inline_Instance_Body will fail.
3680 -- This loses some rare cases of optimization, and might be
3681 -- improved some day, if we can find a proper abstraction for
3682 -- "the complete compilation context" that can be saved and
3685 if Is_Generic_Instance (Current_Scope) then
3687 Curr_Unit : constant Entity_Id :=
3688 Cunit_Entity (Current_Sem_Unit);
3690 if Curr_Unit /= Current_Scope
3691 and then Is_Child_Unit (Curr_Unit)
3693 Inline_Now := False;
3700 (Unit_Requires_Body (Gen_Unit)
3701 or else Enclosing_Body_Present
3702 or else Present (Corresponding_Body (Gen_Decl)))
3703 and then (Is_In_Main_Unit (N)
3704 or else Might_Inline_Subp)
3705 and then not Is_Actual_Pack
3706 and then not Inline_Now
3707 and then not Alfa_Mode
3708 and then (Operating_Mode = Generate_Code
3709 or else (Operating_Mode = Check_Semantics
3710 and then ASIS_Mode));
3712 -- If front_end_inlining is enabled, do not instantiate body if
3713 -- within a generic context.
3715 if (Front_End_Inlining
3716 and then not Expander_Active)
3717 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3719 Needs_Body := False;
3722 -- If the current context is generic, and the package being
3723 -- instantiated is declared within a formal package, there is no
3724 -- body to instantiate until the enclosing generic is instantiated
3725 -- and there is an actual for the formal package. If the formal
3726 -- package has parameters, we build a regular package instance for
3727 -- it, that precedes the original formal package declaration.
3729 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3731 Decl : constant Node_Id :=
3733 (Unit_Declaration_Node (Scope (Gen_Unit)));
3735 if Nkind (Decl) = N_Formal_Package_Declaration
3736 or else (Nkind (Decl) = N_Package_Declaration
3737 and then Is_List_Member (Decl)
3738 and then Present (Next (Decl))
3740 Nkind (Next (Decl)) =
3741 N_Formal_Package_Declaration)
3743 Needs_Body := False;
3749 -- For RCI unit calling stubs, we omit the instance body if the
3750 -- instance is the RCI library unit itself.
3752 -- However there is a special case for nested instances: in this case
3753 -- we do generate the instance body, as it might be required, e.g.
3754 -- because it provides stream attributes for some type used in the
3755 -- profile of a remote subprogram. This is consistent with 12.3(12),
3756 -- which indicates that the instance body occurs at the place of the
3757 -- instantiation, and thus is part of the RCI declaration, which is
3758 -- present on all client partitions (this is E.2.3(18)).
3760 -- Note that AI12-0002 may make it illegal at some point to have
3761 -- stream attributes defined in an RCI unit, in which case this
3762 -- special case will become unnecessary. In the meantime, there
3763 -- is known application code in production that depends on this
3764 -- being possible, so we definitely cannot eliminate the body in
3765 -- the case of nested instances for the time being.
3767 -- When we generate a nested instance body, calling stubs for any
3768 -- relevant subprogram will be be inserted immediately after the
3769 -- subprogram declarations, and will take precedence over the
3770 -- subsequent (original) body. (The stub and original body will be
3771 -- complete homographs, but this is permitted in an instance).
3772 -- (Could we do better and remove the original body???)
3774 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3775 and then Comes_From_Source (N)
3776 and then Nkind (Parent (N)) = N_Compilation_Unit
3778 Needs_Body := False;
3783 -- Here is a defence against a ludicrous number of instantiations
3784 -- caused by a circular set of instantiation attempts.
3786 if Pending_Instantiations.Last > Maximum_Instantiations then
3787 Error_Msg_Uint_1 := UI_From_Int (Maximum_Instantiations);
3788 Error_Msg_N ("too many instantiations, exceeds max of^", N);
3789 Error_Msg_N ("\limit can be changed using -gnateinn switch", N);
3790 raise Unrecoverable_Error;
3793 -- Indicate that the enclosing scopes contain an instantiation,
3794 -- and that cleanup actions should be delayed until after the
3795 -- instance body is expanded.
3797 Check_Forward_Instantiation (Gen_Decl);
3798 if Nkind (N) = N_Package_Instantiation then
3800 Enclosing_Master : Entity_Id;
3803 -- Loop to search enclosing masters
3805 Enclosing_Master := Current_Scope;
3806 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3807 if Ekind (Enclosing_Master) = E_Package then
3808 if Is_Compilation_Unit (Enclosing_Master) then
3809 if In_Package_Body (Enclosing_Master) then
3811 (Body_Entity (Enclosing_Master));
3820 Enclosing_Master := Scope (Enclosing_Master);
3823 elsif Is_Generic_Unit (Enclosing_Master)
3824 or else Ekind (Enclosing_Master) = E_Void
3826 -- Cleanup actions will eventually be performed on the
3827 -- enclosing subprogram or package instance, if any.
3828 -- Enclosing scope is void in the formal part of a
3829 -- generic subprogram.
3834 if Ekind (Enclosing_Master) = E_Entry
3836 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3838 if not Expander_Active then
3842 Protected_Body_Subprogram (Enclosing_Master);
3846 Set_Delay_Cleanups (Enclosing_Master);
3848 while Ekind (Enclosing_Master) = E_Block loop
3849 Enclosing_Master := Scope (Enclosing_Master);
3852 if Is_Subprogram (Enclosing_Master) then
3853 Delay_Descriptors (Enclosing_Master);
3855 elsif Is_Task_Type (Enclosing_Master) then
3857 TBP : constant Node_Id :=
3858 Get_Task_Body_Procedure
3861 if Present (TBP) then
3862 Delay_Descriptors (TBP);
3863 Set_Delay_Cleanups (TBP);
3870 end loop Scope_Loop;
3873 -- Make entry in table
3875 Pending_Instantiations.Append
3877 Act_Decl => Act_Decl,
3878 Expander_Status => Expander_Active,
3879 Current_Sem_Unit => Current_Sem_Unit,
3880 Scope_Suppress => Scope_Suppress,
3881 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3882 Version => Ada_Version));
3886 Set_Categorization_From_Pragmas (Act_Decl);
3888 if Parent_Installed then
3892 Set_Instance_Spec (N, Act_Decl);
3894 -- If not a compilation unit, insert the package declaration before
3895 -- the original instantiation node.
3897 if Nkind (Parent (N)) /= N_Compilation_Unit then
3898 Mark_Rewrite_Insertion (Act_Decl);
3899 Insert_Before (N, Act_Decl);
3902 -- For an instantiation that is a compilation unit, place
3903 -- declaration on current node so context is complete for analysis
3904 -- (including nested instantiations). If this is the main unit,
3905 -- the declaration eventually replaces the instantiation node.
3906 -- If the instance body is created later, it replaces the
3907 -- instance node, and the declaration is attached to it
3908 -- (see Build_Instance_Compilation_Unit_Nodes).
3911 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3913 -- The entity for the current unit is the newly created one,
3914 -- and all semantic information is attached to it.
3916 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3918 -- If this is the main unit, replace the main entity as well
3920 if Current_Sem_Unit = Main_Unit then
3921 Main_Unit_Entity := Act_Decl_Id;
3925 Set_Unit (Parent (N), Act_Decl);
3926 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3927 Set_Package_Instantiation (Act_Decl_Id, N);
3929 Set_Unit (Parent (N), N);
3930 Set_Body_Required (Parent (N), False);
3932 -- We never need elaboration checks on instantiations, since by
3933 -- definition, the body instantiation is elaborated at the same
3934 -- time as the spec instantiation.
3936 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3937 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3940 Check_Elab_Instantiation (N);
3942 if ABE_Is_Certain (N) and then Needs_Body then
3943 Pending_Instantiations.Decrement_Last;
3946 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3948 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3949 First_Private_Entity (Act_Decl_Id));
3951 -- If the instantiation will receive a body, the unit will be
3952 -- transformed into a package body, and receive its own elaboration
3953 -- entity. Otherwise, the nature of the unit is now a package
3956 if Nkind (Parent (N)) = N_Compilation_Unit
3957 and then not Needs_Body
3959 Rewrite (N, Act_Decl);
3962 if Present (Corresponding_Body (Gen_Decl))
3963 or else Unit_Requires_Body (Gen_Unit)
3965 Set_Has_Completion (Act_Decl_Id);
3968 Check_Formal_Packages (Act_Decl_Id);
3970 Restore_Hidden_Primitives (Vis_Prims_List);
3971 Restore_Private_Views (Act_Decl_Id);
3973 Inherit_Context (Gen_Decl, N);
3975 if Parent_Installed then
3980 Env_Installed := False;
3983 Validate_Categorization_Dependency (N, Act_Decl_Id);
3985 -- There used to be a check here to prevent instantiations in local
3986 -- contexts if the No_Local_Allocators restriction was active. This
3987 -- check was removed by a binding interpretation in AI-95-00130/07,
3988 -- but we retain the code for documentation purposes.
3990 -- if Ekind (Act_Decl_Id) /= E_Void
3991 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3993 -- Check_Restriction (No_Local_Allocators, N);
3997 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
4000 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4001 -- be used as defining identifiers for a formal package and for the
4002 -- corresponding expanded package.
4004 if Nkind (N) = N_Formal_Package_Declaration then
4005 Act_Decl_Id := New_Copy (Defining_Entity (N));
4006 Set_Comes_From_Source (Act_Decl_Id, True);
4007 Set_Is_Generic_Instance (Act_Decl_Id, False);
4008 Set_Defining_Identifier (N, Act_Decl_Id);
4011 Style_Check := Save_Style_Check;
4013 -- Check that if N is an instantiation of System.Dim_Float_IO or
4014 -- System.Dim_Integer_IO, the formal type has a dimension system.
4016 if Nkind (N) = N_Package_Instantiation
4017 and then Is_Dim_IO_Package_Instantiation (N)
4020 Assoc : constant Node_Id := First (Generic_Associations (N));
4022 if not Has_Dimension_System
4023 (Etype (Explicit_Generic_Actual_Parameter (Assoc)))
4025 Error_Msg_N ("type with a dimension system expected", Assoc);
4031 if Has_Aspects (N) then
4032 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4036 when Instantiation_Error =>
4037 if Parent_Installed then
4041 if Env_Installed then
4045 Style_Check := Save_Style_Check;
4046 end Analyze_Package_Instantiation;
4048 --------------------------
4049 -- Inline_Instance_Body --
4050 --------------------------
4052 procedure Inline_Instance_Body
4054 Gen_Unit : Entity_Id;
4058 Gen_Comp : constant Entity_Id :=
4059 Cunit_Entity (Get_Source_Unit (Gen_Unit));
4060 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
4061 Curr_Scope : Entity_Id := Empty;
4062 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
4063 Removed : Boolean := False;
4064 Num_Scopes : Int := 0;
4066 Scope_Stack_Depth : constant Int :=
4067 Scope_Stack.Last - Scope_Stack.First + 1;
4069 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
4070 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
4071 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
4072 Num_Inner : Int := 0;
4073 N_Instances : Int := 0;
4077 -- Case of generic unit defined in another unit. We must remove the
4078 -- complete context of the current unit to install that of the generic.
4080 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
4082 -- Add some comments for the following two loops ???
4085 while Present (S) and then S /= Standard_Standard loop
4087 Num_Scopes := Num_Scopes + 1;
4089 Use_Clauses (Num_Scopes) :=
4091 (Scope_Stack.Last - Num_Scopes + 1).
4093 End_Use_Clauses (Use_Clauses (Num_Scopes));
4095 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
4096 or else Scope_Stack.Table
4097 (Scope_Stack.Last - Num_Scopes).Entity
4101 exit when Is_Generic_Instance (S)
4102 and then (In_Package_Body (S)
4103 or else Ekind (S) = E_Procedure
4104 or else Ekind (S) = E_Function);
4108 Vis := Is_Immediately_Visible (Gen_Comp);
4110 -- Find and save all enclosing instances
4115 and then S /= Standard_Standard
4117 if Is_Generic_Instance (S) then
4118 N_Instances := N_Instances + 1;
4119 Instances (N_Instances) := S;
4121 exit when In_Package_Body (S);
4127 -- Remove context of current compilation unit, unless we are within a
4128 -- nested package instantiation, in which case the context has been
4129 -- removed previously.
4131 -- If current scope is the body of a child unit, remove context of
4132 -- spec as well. If an enclosing scope is an instance body, the
4133 -- context has already been removed, but the entities in the body
4134 -- must be made invisible as well.
4139 and then S /= Standard_Standard
4141 if Is_Generic_Instance (S)
4142 and then (In_Package_Body (S)
4143 or else Ekind (S) = E_Procedure
4144 or else Ekind (S) = E_Function)
4146 -- We still have to remove the entities of the enclosing
4147 -- instance from direct visibility.
4152 E := First_Entity (S);
4153 while Present (E) loop
4154 Set_Is_Immediately_Visible (E, False);
4163 or else (Ekind (Curr_Unit) = E_Package_Body
4164 and then S = Spec_Entity (Curr_Unit))
4165 or else (Ekind (Curr_Unit) = E_Subprogram_Body
4168 (Unit_Declaration_Node (Curr_Unit)))
4172 -- Remove entities in current scopes from visibility, so that
4173 -- instance body is compiled in a clean environment.
4175 Save_Scope_Stack (Handle_Use => False);
4177 if Is_Child_Unit (S) then
4179 -- Remove child unit from stack, as well as inner scopes.
4180 -- Removing the context of a child unit removes parent units
4183 while Current_Scope /= S loop
4184 Num_Inner := Num_Inner + 1;
4185 Inner_Scopes (Num_Inner) := Current_Scope;
4190 Remove_Context (Curr_Comp);
4194 Remove_Context (Curr_Comp);
4197 if Ekind (Curr_Unit) = E_Package_Body then
4198 Remove_Context (Library_Unit (Curr_Comp));
4204 pragma Assert (Num_Inner < Num_Scopes);
4206 Push_Scope (Standard_Standard);
4207 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
4208 Instantiate_Package_Body
4211 Act_Decl => Act_Decl,
4212 Expander_Status => Expander_Active,
4213 Current_Sem_Unit => Current_Sem_Unit,
4214 Scope_Suppress => Scope_Suppress,
4215 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4216 Version => Ada_Version)),
4217 Inlined_Body => True);
4223 Set_Is_Immediately_Visible (Gen_Comp, Vis);
4225 -- Reset Generic_Instance flag so that use clauses can be installed
4226 -- in the proper order. (See Use_One_Package for effect of enclosing
4227 -- instances on processing of use clauses).
4229 for J in 1 .. N_Instances loop
4230 Set_Is_Generic_Instance (Instances (J), False);
4234 Install_Context (Curr_Comp);
4236 if Present (Curr_Scope)
4237 and then Is_Child_Unit (Curr_Scope)
4239 Push_Scope (Curr_Scope);
4240 Set_Is_Immediately_Visible (Curr_Scope);
4242 -- Finally, restore inner scopes as well
4244 for J in reverse 1 .. Num_Inner loop
4245 Push_Scope (Inner_Scopes (J));
4249 Restore_Scope_Stack (Handle_Use => False);
4251 if Present (Curr_Scope)
4253 (In_Private_Part (Curr_Scope)
4254 or else In_Package_Body (Curr_Scope))
4256 -- Install private declaration of ancestor units, which are
4257 -- currently available. Restore_Scope_Stack and Install_Context
4258 -- only install the visible part of parents.
4263 Par := Scope (Curr_Scope);
4264 while (Present (Par))
4265 and then Par /= Standard_Standard
4267 Install_Private_Declarations (Par);
4274 -- Restore use clauses. For a child unit, use clauses in the parents
4275 -- are restored when installing the context, so only those in inner
4276 -- scopes (and those local to the child unit itself) need to be
4277 -- installed explicitly.
4279 if Is_Child_Unit (Curr_Unit)
4282 for J in reverse 1 .. Num_Inner + 1 loop
4283 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4285 Install_Use_Clauses (Use_Clauses (J));
4289 for J in reverse 1 .. Num_Scopes loop
4290 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4292 Install_Use_Clauses (Use_Clauses (J));
4296 -- Restore status of instances. If one of them is a body, make
4297 -- its local entities visible again.
4304 for J in 1 .. N_Instances loop
4305 Inst := Instances (J);
4306 Set_Is_Generic_Instance (Inst, True);
4308 if In_Package_Body (Inst)
4309 or else Ekind (S) = E_Procedure
4310 or else Ekind (S) = E_Function
4312 E := First_Entity (Instances (J));
4313 while Present (E) loop
4314 Set_Is_Immediately_Visible (E);
4321 -- If generic unit is in current unit, current context is correct
4324 Instantiate_Package_Body
4327 Act_Decl => Act_Decl,
4328 Expander_Status => Expander_Active,
4329 Current_Sem_Unit => Current_Sem_Unit,
4330 Scope_Suppress => Scope_Suppress,
4331 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4332 Version => Ada_Version)),
4333 Inlined_Body => True);
4335 end Inline_Instance_Body;
4337 -------------------------------------
4338 -- Analyze_Procedure_Instantiation --
4339 -------------------------------------
4341 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4343 Analyze_Subprogram_Instantiation (N, E_Procedure);
4344 end Analyze_Procedure_Instantiation;
4346 -----------------------------------
4347 -- Need_Subprogram_Instance_Body --
4348 -----------------------------------
4350 function Need_Subprogram_Instance_Body
4352 Subp : Entity_Id) return Boolean
4355 if (Is_In_Main_Unit (N)
4356 or else Is_Inlined (Subp)
4357 or else Is_Inlined (Alias (Subp)))
4358 and then (Operating_Mode = Generate_Code
4359 or else (Operating_Mode = Check_Semantics
4360 and then ASIS_Mode))
4361 and then (Full_Expander_Active or else ASIS_Mode)
4362 and then not ABE_Is_Certain (N)
4363 and then not Is_Eliminated (Subp)
4365 Pending_Instantiations.Append
4367 Act_Decl => Unit_Declaration_Node (Subp),
4368 Expander_Status => Expander_Active,
4369 Current_Sem_Unit => Current_Sem_Unit,
4370 Scope_Suppress => Scope_Suppress,
4371 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4372 Version => Ada_Version));
4378 end Need_Subprogram_Instance_Body;
4380 --------------------------------------
4381 -- Analyze_Subprogram_Instantiation --
4382 --------------------------------------
4384 procedure Analyze_Subprogram_Instantiation
4388 Loc : constant Source_Ptr := Sloc (N);
4389 Gen_Id : constant Node_Id := Name (N);
4391 Anon_Id : constant Entity_Id :=
4392 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4393 Chars => New_External_Name
4394 (Chars (Defining_Entity (N)), 'R'));
4396 Act_Decl_Id : Entity_Id;
4401 Env_Installed : Boolean := False;
4402 Gen_Unit : Entity_Id;
4404 Pack_Id : Entity_Id;
4405 Parent_Installed : Boolean := False;
4406 Renaming_List : List_Id;
4408 Save_Style_Check : constant Boolean := Style_Check;
4409 -- Save style check mode for restore on exit
4411 procedure Analyze_Instance_And_Renamings;
4412 -- The instance must be analyzed in a context that includes the mappings
4413 -- of generic parameters into actuals. We create a package declaration
4414 -- for this purpose, and a subprogram with an internal name within the
4415 -- package. The subprogram instance is simply an alias for the internal
4416 -- subprogram, declared in the current scope.
4418 ------------------------------------
4419 -- Analyze_Instance_And_Renamings --
4420 ------------------------------------
4422 procedure Analyze_Instance_And_Renamings is
4423 Def_Ent : constant Entity_Id := Defining_Entity (N);
4424 Pack_Decl : Node_Id;
4427 if Nkind (Parent (N)) = N_Compilation_Unit then
4429 -- For the case of a compilation unit, the container package has
4430 -- the same name as the instantiation, to insure that the binder
4431 -- calls the elaboration procedure with the right name. Copy the
4432 -- entity of the instance, which may have compilation level flags
4433 -- (e.g. Is_Child_Unit) set.
4435 Pack_Id := New_Copy (Def_Ent);
4438 -- Otherwise we use the name of the instantiation concatenated
4439 -- with its source position to ensure uniqueness if there are
4440 -- several instantiations with the same name.
4443 Make_Defining_Identifier (Loc,
4444 Chars => New_External_Name
4445 (Related_Id => Chars (Def_Ent),
4447 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4450 Pack_Decl := Make_Package_Declaration (Loc,
4451 Specification => Make_Package_Specification (Loc,
4452 Defining_Unit_Name => Pack_Id,
4453 Visible_Declarations => Renaming_List,
4454 End_Label => Empty));
4456 Set_Instance_Spec (N, Pack_Decl);
4457 Set_Is_Generic_Instance (Pack_Id);
4458 Set_Debug_Info_Needed (Pack_Id);
4460 -- Case of not a compilation unit
4462 if Nkind (Parent (N)) /= N_Compilation_Unit then
4463 Mark_Rewrite_Insertion (Pack_Decl);
4464 Insert_Before (N, Pack_Decl);
4465 Set_Has_Completion (Pack_Id);
4467 -- Case of an instantiation that is a compilation unit
4469 -- Place declaration on current node so context is complete for
4470 -- analysis (including nested instantiations), and for use in a
4471 -- context_clause (see Analyze_With_Clause).
4474 Set_Unit (Parent (N), Pack_Decl);
4475 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4478 Analyze (Pack_Decl);
4479 Check_Formal_Packages (Pack_Id);
4480 Set_Is_Generic_Instance (Pack_Id, False);
4482 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4485 -- Body of the enclosing package is supplied when instantiating the
4486 -- subprogram body, after semantic analysis is completed.
4488 if Nkind (Parent (N)) = N_Compilation_Unit then
4490 -- Remove package itself from visibility, so it does not
4491 -- conflict with subprogram.
4493 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4495 -- Set name and scope of internal subprogram so that the proper
4496 -- external name will be generated. The proper scope is the scope
4497 -- of the wrapper package. We need to generate debugging info for
4498 -- the internal subprogram, so set flag accordingly.
4500 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4501 Set_Scope (Anon_Id, Scope (Pack_Id));
4503 -- Mark wrapper package as referenced, to avoid spurious warnings
4504 -- if the instantiation appears in various with_ clauses of
4505 -- subunits of the main unit.
4507 Set_Referenced (Pack_Id);
4510 Set_Is_Generic_Instance (Anon_Id);
4511 Set_Debug_Info_Needed (Anon_Id);
4512 Act_Decl_Id := New_Copy (Anon_Id);
4514 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4515 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4516 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4517 Set_Comes_From_Source (Act_Decl_Id, True);
4519 -- The signature may involve types that are not frozen yet, but the
4520 -- subprogram will be frozen at the point the wrapper package is
4521 -- frozen, so it does not need its own freeze node. In fact, if one
4522 -- is created, it might conflict with the freezing actions from the
4525 Set_Has_Delayed_Freeze (Anon_Id, False);
4527 -- If the instance is a child unit, mark the Id accordingly. Mark
4528 -- the anonymous entity as well, which is the real subprogram and
4529 -- which is used when the instance appears in a context clause.
4530 -- Similarly, propagate the Is_Eliminated flag to handle properly
4531 -- nested eliminated subprograms.
4533 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4534 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4535 New_Overloaded_Entity (Act_Decl_Id);
4536 Check_Eliminated (Act_Decl_Id);
4537 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4539 -- In compilation unit case, kill elaboration checks on the
4540 -- instantiation, since they are never needed -- the body is
4541 -- instantiated at the same point as the spec.
4543 if Nkind (Parent (N)) = N_Compilation_Unit then
4544 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4545 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4546 Set_Is_Compilation_Unit (Anon_Id);
4548 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4551 -- The instance is not a freezing point for the new subprogram
4553 Set_Is_Frozen (Act_Decl_Id, False);
4555 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4556 Valid_Operator_Definition (Act_Decl_Id);
4559 Set_Alias (Act_Decl_Id, Anon_Id);
4560 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4561 Set_Has_Completion (Act_Decl_Id);
4562 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4564 if Nkind (Parent (N)) = N_Compilation_Unit then
4565 Set_Body_Required (Parent (N), False);
4567 end Analyze_Instance_And_Renamings;
4571 Vis_Prims_List : Elist_Id := No_Elist;
4572 -- List of primitives made temporarily visible in the instantiation
4573 -- to match the visibility of the formal type
4575 -- Start of processing for Analyze_Subprogram_Instantiation
4578 Check_SPARK_Restriction ("generic is not allowed", N);
4580 -- Very first thing: apply the special kludge for Text_IO processing
4581 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4582 -- Of course such an instantiation is bogus (these are packages, not
4583 -- subprograms), but we get a better error message if we do this.
4585 Text_IO_Kludge (Gen_Id);
4587 -- Make node global for error reporting
4589 Instantiation_Node := N;
4591 -- Turn off style checking in instances. If the check is enabled on the
4592 -- generic unit, a warning in an instance would just be noise. If not
4593 -- enabled on the generic, then a warning in an instance is just wrong.
4595 Style_Check := False;
4597 Preanalyze_Actuals (N);
4600 Env_Installed := True;
4601 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4602 Gen_Unit := Entity (Gen_Id);
4604 Generate_Reference (Gen_Unit, Gen_Id);
4606 if Nkind (Gen_Id) = N_Identifier
4607 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4610 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4613 if Etype (Gen_Unit) = Any_Type then
4618 -- Verify that it is a generic subprogram of the right kind, and that
4619 -- it does not lead to a circular instantiation.
4621 if not Ekind_In (Gen_Unit, E_Generic_Procedure, E_Generic_Function) then
4622 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
4624 elsif In_Open_Scopes (Gen_Unit) then
4625 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4627 elsif K = E_Procedure
4628 and then Ekind (Gen_Unit) /= E_Generic_Procedure
4630 if Ekind (Gen_Unit) = E_Generic_Function then
4632 ("cannot instantiate generic function as procedure", Gen_Id);
4635 ("expect name of generic procedure in instantiation", Gen_Id);
4638 elsif K = E_Function
4639 and then Ekind (Gen_Unit) /= E_Generic_Function
4641 if Ekind (Gen_Unit) = E_Generic_Procedure then
4643 ("cannot instantiate generic procedure as function", Gen_Id);
4646 ("expect name of generic function in instantiation", Gen_Id);
4650 Set_Entity (Gen_Id, Gen_Unit);
4651 Set_Is_Instantiated (Gen_Unit);
4653 if In_Extended_Main_Source_Unit (N) then
4654 Generate_Reference (Gen_Unit, N);
4657 -- If renaming, get original unit
4659 if Present (Renamed_Object (Gen_Unit))
4660 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4662 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4664 Gen_Unit := Renamed_Object (Gen_Unit);
4665 Set_Is_Instantiated (Gen_Unit);
4666 Generate_Reference (Gen_Unit, N);
4669 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4670 Error_Msg_Node_2 := Current_Scope;
4672 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4673 Circularity_Detected := True;
4674 Restore_Hidden_Primitives (Vis_Prims_List);
4678 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4680 -- Initialize renamings map, for error checking
4682 Generic_Renamings.Set_Last (0);
4683 Generic_Renamings_HTable.Reset;
4685 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4687 -- Copy original generic tree, to produce text for instantiation
4691 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4693 -- Inherit overriding indicator from instance node
4695 Act_Spec := Specification (Act_Tree);
4696 Set_Must_Override (Act_Spec, Must_Override (N));
4697 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4700 Analyze_Associations
4702 Formals => Generic_Formal_Declarations (Act_Tree),
4703 F_Copy => Generic_Formal_Declarations (Gen_Decl));
4705 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
4707 -- The subprogram itself cannot contain a nested instance, so the
4708 -- current parent is left empty.
4710 Set_Instance_Env (Gen_Unit, Empty);
4712 -- Build the subprogram declaration, which does not appear in the
4713 -- generic template, and give it a sloc consistent with that of the
4716 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4717 Set_Generic_Parent (Act_Spec, Gen_Unit);
4719 Make_Subprogram_Declaration (Sloc (Act_Spec),
4720 Specification => Act_Spec);
4722 -- The aspects have been copied previously, but they have to be
4723 -- linked explicitly to the new subprogram declaration. Explicit
4724 -- pre/postconditions on the instance are analyzed below, in a
4727 Move_Aspects (Act_Tree, Act_Decl);
4728 Set_Categorization_From_Pragmas (Act_Decl);
4730 if Parent_Installed then
4734 Append (Act_Decl, Renaming_List);
4735 Analyze_Instance_And_Renamings;
4737 -- If the generic is marked Import (Intrinsic), then so is the
4738 -- instance. This indicates that there is no body to instantiate. If
4739 -- generic is marked inline, so it the instance, and the anonymous
4740 -- subprogram it renames. If inlined, or else if inlining is enabled
4741 -- for the compilation, we generate the instance body even if it is
4742 -- not within the main unit.
4744 if Is_Intrinsic_Subprogram (Gen_Unit) then
4745 Set_Is_Intrinsic_Subprogram (Anon_Id);
4746 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4748 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4749 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4753 -- Inherit convention from generic unit. Intrinsic convention, as for
4754 -- an instance of unchecked conversion, is not inherited because an
4755 -- explicit Ada instance has been created.
4757 if Has_Convention_Pragma (Gen_Unit)
4758 and then Convention (Gen_Unit) /= Convention_Intrinsic
4760 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
4761 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
4764 Generate_Definition (Act_Decl_Id);
4765 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
4767 Set_Contract (Act_Decl_Id, Make_Contract (Sloc (Act_Decl_Id)));
4769 -- Inherit all inlining-related flags which apply to the generic in
4770 -- the subprogram and its declaration.
4772 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4773 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4775 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
4776 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
4778 Set_Has_Pragma_Inline_Always
4779 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
4780 Set_Has_Pragma_Inline_Always
4781 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
4783 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4784 Check_Elab_Instantiation (N);
4787 if Is_Dispatching_Operation (Act_Decl_Id)
4788 and then Ada_Version >= Ada_2005
4794 Formal := First_Formal (Act_Decl_Id);
4795 while Present (Formal) loop
4796 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4797 and then Is_Controlling_Formal (Formal)
4798 and then not Can_Never_Be_Null (Formal)
4800 Error_Msg_NE ("access parameter& is controlling,",
4803 ("\corresponding parameter of & must be"
4804 & " explicitly null-excluding", N, Gen_Id);
4807 Next_Formal (Formal);
4812 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4814 Validate_Categorization_Dependency (N, Act_Decl_Id);
4816 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4817 Inherit_Context (Gen_Decl, N);
4819 Restore_Private_Views (Pack_Id, False);
4821 -- If the context requires a full instantiation, mark node for
4822 -- subsequent construction of the body.
4824 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4826 Check_Forward_Instantiation (Gen_Decl);
4828 -- The wrapper package is always delayed, because it does not
4829 -- constitute a freeze point, but to insure that the freeze
4830 -- node is placed properly, it is created directly when
4831 -- instantiating the body (otherwise the freeze node might
4832 -- appear to early for nested instantiations).
4834 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4836 -- For ASIS purposes, indicate that the wrapper package has
4837 -- replaced the instantiation node.
4839 Rewrite (N, Unit (Parent (N)));
4840 Set_Unit (Parent (N), N);
4843 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4845 -- Replace instance node for library-level instantiations of
4846 -- intrinsic subprograms, for ASIS use.
4848 Rewrite (N, Unit (Parent (N)));
4849 Set_Unit (Parent (N), N);
4852 if Parent_Installed then
4856 Restore_Hidden_Primitives (Vis_Prims_List);
4858 Env_Installed := False;
4859 Generic_Renamings.Set_Last (0);
4860 Generic_Renamings_HTable.Reset;
4863 Style_Check := Save_Style_Check;
4866 if Has_Aspects (N) then
4867 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4871 when Instantiation_Error =>
4872 if Parent_Installed then
4876 if Env_Installed then
4880 Style_Check := Save_Style_Check;
4881 end Analyze_Subprogram_Instantiation;
4883 -------------------------
4884 -- Get_Associated_Node --
4885 -------------------------
4887 function Get_Associated_Node (N : Node_Id) return Node_Id is
4891 Assoc := Associated_Node (N);
4893 if Nkind (Assoc) /= Nkind (N) then
4896 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4900 -- If the node is part of an inner generic, it may itself have been
4901 -- remapped into a further generic copy. Associated_Node is otherwise
4902 -- used for the entity of the node, and will be of a different node
4903 -- kind, or else N has been rewritten as a literal or function call.
4905 while Present (Associated_Node (Assoc))
4906 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4908 Assoc := Associated_Node (Assoc);
4911 -- Follow and additional link in case the final node was rewritten.
4912 -- This can only happen with nested generic units.
4914 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4915 and then Present (Associated_Node (Assoc))
4916 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4917 N_Explicit_Dereference,
4922 Assoc := Associated_Node (Assoc);
4927 end Get_Associated_Node;
4929 -------------------------------------------
4930 -- Build_Instance_Compilation_Unit_Nodes --
4931 -------------------------------------------
4933 procedure Build_Instance_Compilation_Unit_Nodes
4938 Decl_Cunit : Node_Id;
4939 Body_Cunit : Node_Id;
4941 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4942 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4945 -- A new compilation unit node is built for the instance declaration
4948 Make_Compilation_Unit (Sloc (N),
4949 Context_Items => Empty_List,
4952 Make_Compilation_Unit_Aux (Sloc (N)));
4954 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4956 -- The new compilation unit is linked to its body, but both share the
4957 -- same file, so we do not set Body_Required on the new unit so as not
4958 -- to create a spurious dependency on a non-existent body in the ali.
4959 -- This simplifies CodePeer unit traversal.
4961 -- We use the original instantiation compilation unit as the resulting
4962 -- compilation unit of the instance, since this is the main unit.
4964 Rewrite (N, Act_Body);
4965 Body_Cunit := Parent (N);
4967 -- The two compilation unit nodes are linked by the Library_Unit field
4969 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4970 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4972 -- Preserve the private nature of the package if needed
4974 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4976 -- If the instance is not the main unit, its context, categorization
4977 -- and elaboration entity are not relevant to the compilation.
4979 if Body_Cunit /= Cunit (Main_Unit) then
4980 Make_Instance_Unit (Body_Cunit, In_Main => False);
4984 -- The context clause items on the instantiation, which are now attached
4985 -- to the body compilation unit (since the body overwrote the original
4986 -- instantiation node), semantically belong on the spec, so copy them
4987 -- there. It's harmless to leave them on the body as well. In fact one
4988 -- could argue that they belong in both places.
4990 Citem := First (Context_Items (Body_Cunit));
4991 while Present (Citem) loop
4992 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4996 -- Propagate categorization flags on packages, so that they appear in
4997 -- the ali file for the spec of the unit.
4999 if Ekind (New_Main) = E_Package then
5000 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
5001 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
5002 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
5003 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
5004 Set_Is_Remote_Call_Interface
5005 (Old_Main, Is_Remote_Call_Interface (New_Main));
5008 -- Make entry in Units table, so that binder can generate call to
5009 -- elaboration procedure for body, if any.
5011 Make_Instance_Unit (Body_Cunit, In_Main => True);
5012 Main_Unit_Entity := New_Main;
5013 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
5015 -- Build elaboration entity, since the instance may certainly generate
5016 -- elaboration code requiring a flag for protection.
5018 Build_Elaboration_Entity (Decl_Cunit, New_Main);
5019 end Build_Instance_Compilation_Unit_Nodes;
5021 -----------------------------
5022 -- Check_Access_Definition --
5023 -----------------------------
5025 procedure Check_Access_Definition (N : Node_Id) is
5028 (Ada_Version >= Ada_2005
5029 and then Present (Access_Definition (N)));
5031 end Check_Access_Definition;
5033 -----------------------------------
5034 -- Check_Formal_Package_Instance --
5035 -----------------------------------
5037 -- If the formal has specific parameters, they must match those of the
5038 -- actual. Both of them are instances, and the renaming declarations for
5039 -- their formal parameters appear in the same order in both. The analyzed
5040 -- formal has been analyzed in the context of the current instance.
5042 procedure Check_Formal_Package_Instance
5043 (Formal_Pack : Entity_Id;
5044 Actual_Pack : Entity_Id)
5046 E1 : Entity_Id := First_Entity (Actual_Pack);
5047 E2 : Entity_Id := First_Entity (Formal_Pack);
5052 procedure Check_Mismatch (B : Boolean);
5053 -- Common error routine for mismatch between the parameters of the
5054 -- actual instance and those of the formal package.
5056 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
5057 -- The formal may come from a nested formal package, and the actual may
5058 -- have been constant-folded. To determine whether the two denote the
5059 -- same entity we may have to traverse several definitions to recover
5060 -- the ultimate entity that they refer to.
5062 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
5063 -- Similarly, if the formal comes from a nested formal package, the
5064 -- actual may designate the formal through multiple renamings, which
5065 -- have to be followed to determine the original variable in question.
5067 --------------------
5068 -- Check_Mismatch --
5069 --------------------
5071 procedure Check_Mismatch (B : Boolean) is
5072 Kind : constant Node_Kind := Nkind (Parent (E2));
5075 if Kind = N_Formal_Type_Declaration then
5078 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
5079 N_Formal_Package_Declaration)
5080 or else Kind in N_Formal_Subprogram_Declaration
5086 ("actual for & in actual instance does not match formal",
5087 Parent (Actual_Pack), E1);
5091 --------------------------------
5092 -- Same_Instantiated_Constant --
5093 --------------------------------
5095 function Same_Instantiated_Constant
5096 (E1, E2 : Entity_Id) return Boolean
5102 while Present (Ent) loop
5106 elsif Ekind (Ent) /= E_Constant then
5109 elsif Is_Entity_Name (Constant_Value (Ent)) then
5110 if Entity (Constant_Value (Ent)) = E1 then
5113 Ent := Entity (Constant_Value (Ent));
5116 -- The actual may be a constant that has been folded. Recover
5119 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
5120 Ent := Entity (Original_Node (Constant_Value (Ent)));
5127 end Same_Instantiated_Constant;
5129 --------------------------------
5130 -- Same_Instantiated_Variable --
5131 --------------------------------
5133 function Same_Instantiated_Variable
5134 (E1, E2 : Entity_Id) return Boolean
5136 function Original_Entity (E : Entity_Id) return Entity_Id;
5137 -- Follow chain of renamings to the ultimate ancestor
5139 ---------------------
5140 -- Original_Entity --
5141 ---------------------
5143 function Original_Entity (E : Entity_Id) return Entity_Id is
5148 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
5149 and then Present (Renamed_Object (Orig))
5150 and then Is_Entity_Name (Renamed_Object (Orig))
5152 Orig := Entity (Renamed_Object (Orig));
5156 end Original_Entity;
5158 -- Start of processing for Same_Instantiated_Variable
5161 return Ekind (E1) = Ekind (E2)
5162 and then Original_Entity (E1) = Original_Entity (E2);
5163 end Same_Instantiated_Variable;
5165 -- Start of processing for Check_Formal_Package_Instance
5169 and then Present (E2)
5171 exit when Ekind (E1) = E_Package
5172 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
5174 -- If the formal is the renaming of the formal package, this
5175 -- is the end of its formal part, which may occur before the
5176 -- end of the formal part in the actual in the presence of
5177 -- defaulted parameters in the formal package.
5179 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
5180 and then Renamed_Entity (E2) = Scope (E2);
5182 -- The analysis of the actual may generate additional internal
5183 -- entities. If the formal is defaulted, there is no corresponding
5184 -- analysis and the internal entities must be skipped, until we
5185 -- find corresponding entities again.
5187 if Comes_From_Source (E2)
5188 and then not Comes_From_Source (E1)
5189 and then Chars (E1) /= Chars (E2)
5192 and then Chars (E1) /= Chars (E2)
5201 -- If the formal entity comes from a formal declaration, it was
5202 -- defaulted in the formal package, and no check is needed on it.
5204 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
5207 elsif Is_Type (E1) then
5209 -- Subtypes must statically match. E1, E2 are the local entities
5210 -- that are subtypes of the actuals. Itypes generated for other
5211 -- parameters need not be checked, the check will be performed
5212 -- on the parameters themselves.
5214 -- If E2 is a formal type declaration, it is a defaulted parameter
5215 -- and needs no checking.
5217 if not Is_Itype (E1)
5218 and then not Is_Itype (E2)
5222 or else Etype (E1) /= Etype (E2)
5223 or else not Subtypes_Statically_Match (E1, E2));
5226 elsif Ekind (E1) = E_Constant then
5228 -- IN parameters must denote the same static value, or the same
5229 -- constant, or the literal null.
5231 Expr1 := Expression (Parent (E1));
5233 if Ekind (E2) /= E_Constant then
5234 Check_Mismatch (True);
5237 Expr2 := Expression (Parent (E2));
5240 if Is_Static_Expression (Expr1) then
5242 if not Is_Static_Expression (Expr2) then
5243 Check_Mismatch (True);
5245 elsif Is_Discrete_Type (Etype (E1)) then
5247 V1 : constant Uint := Expr_Value (Expr1);
5248 V2 : constant Uint := Expr_Value (Expr2);
5250 Check_Mismatch (V1 /= V2);
5253 elsif Is_Real_Type (Etype (E1)) then
5255 V1 : constant Ureal := Expr_Value_R (Expr1);
5256 V2 : constant Ureal := Expr_Value_R (Expr2);
5258 Check_Mismatch (V1 /= V2);
5261 elsif Is_String_Type (Etype (E1))
5262 and then Nkind (Expr1) = N_String_Literal
5264 if Nkind (Expr2) /= N_String_Literal then
5265 Check_Mismatch (True);
5268 (not String_Equal (Strval (Expr1), Strval (Expr2)));
5272 elsif Is_Entity_Name (Expr1) then
5273 if Is_Entity_Name (Expr2) then
5274 if Entity (Expr1) = Entity (Expr2) then
5278 (not Same_Instantiated_Constant
5279 (Entity (Expr1), Entity (Expr2)));
5282 Check_Mismatch (True);
5285 elsif Is_Entity_Name (Original_Node (Expr1))
5286 and then Is_Entity_Name (Expr2)
5288 Same_Instantiated_Constant
5289 (Entity (Original_Node (Expr1)), Entity (Expr2))
5293 elsif Nkind (Expr1) = N_Null then
5294 Check_Mismatch (Nkind (Expr1) /= N_Null);
5297 Check_Mismatch (True);
5300 elsif Ekind (E1) = E_Variable then
5301 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
5303 elsif Ekind (E1) = E_Package then
5305 (Ekind (E1) /= Ekind (E2)
5306 or else Renamed_Object (E1) /= Renamed_Object (E2));
5308 elsif Is_Overloadable (E1) then
5310 -- Verify that the actual subprograms match. Note that actuals
5311 -- that are attributes are rewritten as subprograms. If the
5312 -- subprogram in the formal package is defaulted, no check is
5313 -- needed. Note that this can only happen in Ada 2005 when the
5314 -- formal package can be partially parameterized.
5316 if Nkind (Unit_Declaration_Node (E1)) =
5317 N_Subprogram_Renaming_Declaration
5318 and then From_Default (Unit_Declaration_Node (E1))
5322 -- If the formal package has an "others" box association that
5323 -- covers this formal, there is no need for a check either.
5325 elsif Nkind (Unit_Declaration_Node (E2)) in
5326 N_Formal_Subprogram_Declaration
5327 and then Box_Present (Unit_Declaration_Node (E2))
5331 -- No check needed if subprogram is a defaulted null procedure
5333 elsif No (Alias (E2))
5334 and then Ekind (E2) = E_Procedure
5336 Null_Present (Specification (Unit_Declaration_Node (E2)))
5340 -- Otherwise the actual in the formal and the actual in the
5341 -- instantiation of the formal must match, up to renamings.
5345 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5349 raise Program_Error;
5356 end Check_Formal_Package_Instance;
5358 ---------------------------
5359 -- Check_Formal_Packages --
5360 ---------------------------
5362 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5364 Formal_P : Entity_Id;
5367 -- Iterate through the declarations in the instance, looking for package
5368 -- renaming declarations that denote instances of formal packages. Stop
5369 -- when we find the renaming of the current package itself. The
5370 -- declaration for a formal package without a box is followed by an
5371 -- internal entity that repeats the instantiation.
5373 E := First_Entity (P_Id);
5374 while Present (E) loop
5375 if Ekind (E) = E_Package then
5376 if Renamed_Object (E) = P_Id then
5379 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5382 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5383 Formal_P := Next_Entity (E);
5384 Check_Formal_Package_Instance (Formal_P, E);
5386 -- After checking, remove the internal validating package. It
5387 -- is only needed for semantic checks, and as it may contain
5388 -- generic formal declarations it should not reach gigi.
5390 Remove (Unit_Declaration_Node (Formal_P));
5396 end Check_Formal_Packages;
5398 ---------------------------------
5399 -- Check_Forward_Instantiation --
5400 ---------------------------------
5402 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5404 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5407 -- The instantiation appears before the generic body if we are in the
5408 -- scope of the unit containing the generic, either in its spec or in
5409 -- the package body, and before the generic body.
5411 if Ekind (Gen_Comp) = E_Package_Body then
5412 Gen_Comp := Spec_Entity (Gen_Comp);
5415 if In_Open_Scopes (Gen_Comp)
5416 and then No (Corresponding_Body (Decl))
5421 and then not Is_Compilation_Unit (S)
5422 and then not Is_Child_Unit (S)
5424 if Ekind (S) = E_Package then
5425 Set_Has_Forward_Instantiation (S);
5431 end Check_Forward_Instantiation;
5433 ---------------------------
5434 -- Check_Generic_Actuals --
5435 ---------------------------
5437 -- The visibility of the actuals may be different between the point of
5438 -- generic instantiation and the instantiation of the body.
5440 procedure Check_Generic_Actuals
5441 (Instance : Entity_Id;
5442 Is_Formal_Box : Boolean)
5447 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5448 -- For a formal that is an array type, the component type is often a
5449 -- previous formal in the same unit. The privacy status of the component
5450 -- type will have been examined earlier in the traversal of the
5451 -- corresponding actuals, and this status should not be modified for the
5452 -- array type itself.
5454 -- To detect this case we have to rescan the list of formals, which
5455 -- is usually short enough to ignore the resulting inefficiency.
5457 -----------------------------
5458 -- Denotes_Previous_Actual --
5459 -----------------------------
5461 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5465 Prev := First_Entity (Instance);
5466 while Present (Prev) loop
5468 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5469 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5470 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5483 end Denotes_Previous_Actual;
5485 -- Start of processing for Check_Generic_Actuals
5488 E := First_Entity (Instance);
5489 while Present (E) loop
5491 and then Nkind (Parent (E)) = N_Subtype_Declaration
5492 and then Scope (Etype (E)) /= Instance
5493 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5495 if Is_Array_Type (E)
5496 and then Denotes_Previous_Actual (Component_Type (E))
5500 Check_Private_View (Subtype_Indication (Parent (E)));
5503 Set_Is_Generic_Actual_Type (E, True);
5504 Set_Is_Hidden (E, False);
5505 Set_Is_Potentially_Use_Visible (E,
5508 -- We constructed the generic actual type as a subtype of the
5509 -- supplied type. This means that it normally would not inherit
5510 -- subtype specific attributes of the actual, which is wrong for
5511 -- the generic case.
5513 Astype := Ancestor_Subtype (E);
5517 -- This can happen when E is an itype that is the full view of
5518 -- a private type completed, e.g. with a constrained array. In
5519 -- that case, use the first subtype, which will carry size
5520 -- information. The base type itself is unconstrained and will
5523 Astype := First_Subtype (E);
5526 Set_Size_Info (E, (Astype));
5527 Set_RM_Size (E, RM_Size (Astype));
5528 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5530 if Is_Discrete_Or_Fixed_Point_Type (E) then
5531 Set_RM_Size (E, RM_Size (Astype));
5533 -- In nested instances, the base type of an access actual
5534 -- may itself be private, and need to be exchanged.
5536 elsif Is_Access_Type (E)
5537 and then Is_Private_Type (Etype (E))
5540 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5543 elsif Ekind (E) = E_Package then
5545 -- If this is the renaming for the current instance, we're done.
5546 -- Otherwise it is a formal package. If the corresponding formal
5547 -- was declared with a box, the (instantiations of the) generic
5548 -- formal part are also visible. Otherwise, ignore the entity
5549 -- created to validate the actuals.
5551 if Renamed_Object (E) = Instance then
5554 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5557 -- The visibility of a formal of an enclosing generic is already
5560 elsif Denotes_Formal_Package (E) then
5563 elsif Present (Associated_Formal_Package (E))
5564 and then not Is_Generic_Formal (E)
5566 if Box_Present (Parent (Associated_Formal_Package (E))) then
5567 Check_Generic_Actuals (Renamed_Object (E), True);
5570 Check_Generic_Actuals (Renamed_Object (E), False);
5573 Set_Is_Hidden (E, False);
5576 -- If this is a subprogram instance (in a wrapper package) the
5577 -- actual is fully visible.
5579 elsif Is_Wrapper_Package (Instance) then
5580 Set_Is_Hidden (E, False);
5582 -- If the formal package is declared with a box, or if the formal
5583 -- parameter is defaulted, it is visible in the body.
5586 or else Is_Visible_Formal (E)
5588 Set_Is_Hidden (E, False);
5591 if Ekind (E) = E_Constant then
5593 -- If the type of the actual is a private type declared in the
5594 -- enclosing scope of the generic unit, the body of the generic
5595 -- sees the full view of the type (because it has to appear in
5596 -- the corresponding package body). If the type is private now,
5597 -- exchange views to restore the proper visiblity in the instance.
5600 Typ : constant Entity_Id := Base_Type (Etype (E));
5601 -- The type of the actual
5606 Parent_Scope : Entity_Id;
5607 -- The enclosing scope of the generic unit
5610 if Is_Wrapper_Package (Instance) then
5614 (Unit_Declaration_Node
5615 (Related_Instance (Instance))));
5619 (Specification (Unit_Declaration_Node (Instance)));
5622 Parent_Scope := Scope (Gen_Id);
5624 -- The exchange is only needed if the generic is defined
5625 -- within a package which is not a common ancestor of the
5626 -- scope of the instance, and is not already in scope.
5628 if Is_Private_Type (Typ)
5629 and then Scope (Typ) = Parent_Scope
5630 and then Scope (Instance) /= Parent_Scope
5631 and then Ekind (Parent_Scope) = E_Package
5632 and then not Is_Child_Unit (Gen_Id)
5636 -- If the type of the entity is a subtype, it may also
5637 -- have to be made visible, together with the base type
5638 -- of its full view, after exchange.
5640 if Is_Private_Type (Etype (E)) then
5641 Switch_View (Etype (E));
5642 Switch_View (Base_Type (Etype (E)));
5650 end Check_Generic_Actuals;
5652 ------------------------------
5653 -- Check_Generic_Child_Unit --
5654 ------------------------------
5656 procedure Check_Generic_Child_Unit
5658 Parent_Installed : in out Boolean)
5660 Loc : constant Source_Ptr := Sloc (Gen_Id);
5661 Gen_Par : Entity_Id := Empty;
5663 Inst_Par : Entity_Id;
5666 function Find_Generic_Child
5668 Id : Node_Id) return Entity_Id;
5669 -- Search generic parent for possible child unit with the given name
5671 function In_Enclosing_Instance return Boolean;
5672 -- Within an instance of the parent, the child unit may be denoted
5673 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5674 -- scopes to locate a possible parent instantiation.
5676 ------------------------
5677 -- Find_Generic_Child --
5678 ------------------------
5680 function Find_Generic_Child
5682 Id : Node_Id) return Entity_Id
5687 -- If entity of name is already set, instance has already been
5688 -- resolved, e.g. in an enclosing instantiation.
5690 if Present (Entity (Id)) then
5691 if Scope (Entity (Id)) = Scop then
5698 E := First_Entity (Scop);
5699 while Present (E) loop
5700 if Chars (E) = Chars (Id)
5701 and then Is_Child_Unit (E)
5703 if Is_Child_Unit (E)
5704 and then not Is_Visible_Child_Unit (E)
5707 ("generic child unit& is not visible", Gen_Id, E);
5719 end Find_Generic_Child;
5721 ---------------------------
5722 -- In_Enclosing_Instance --
5723 ---------------------------
5725 function In_Enclosing_Instance return Boolean is
5726 Enclosing_Instance : Node_Id;
5727 Instance_Decl : Node_Id;
5730 -- We do not inline any call that contains instantiations, except
5731 -- for instantiations of Unchecked_Conversion, so if we are within
5732 -- an inlined body the current instance does not require parents.
5734 if In_Inlined_Body then
5735 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5739 -- Loop to check enclosing scopes
5741 Enclosing_Instance := Current_Scope;
5742 while Present (Enclosing_Instance) loop
5743 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5745 if Ekind (Enclosing_Instance) = E_Package
5746 and then Is_Generic_Instance (Enclosing_Instance)
5748 (Generic_Parent (Specification (Instance_Decl)))
5750 -- Check whether the generic we are looking for is a child of
5753 E := Find_Generic_Child
5754 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5755 exit when Present (E);
5761 Enclosing_Instance := Scope (Enclosing_Instance);
5773 Make_Expanded_Name (Loc,
5775 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5776 Selector_Name => New_Occurrence_Of (E, Loc)));
5778 Set_Entity (Gen_Id, E);
5779 Set_Etype (Gen_Id, Etype (E));
5780 Parent_Installed := False; -- Already in scope.
5783 end In_Enclosing_Instance;
5785 -- Start of processing for Check_Generic_Child_Unit
5788 -- If the name of the generic is given by a selected component, it may
5789 -- be the name of a generic child unit, and the prefix is the name of an
5790 -- instance of the parent, in which case the child unit must be visible.
5791 -- If this instance is not in scope, it must be placed there and removed
5792 -- after instantiation, because what is being instantiated is not the
5793 -- original child, but the corresponding child present in the instance
5796 -- If the child is instantiated within the parent, it can be given by
5797 -- a simple name. In this case the instance is already in scope, but
5798 -- the child generic must be recovered from the generic parent as well.
5800 if Nkind (Gen_Id) = N_Selected_Component then
5801 S := Selector_Name (Gen_Id);
5802 Analyze (Prefix (Gen_Id));
5803 Inst_Par := Entity (Prefix (Gen_Id));
5805 if Ekind (Inst_Par) = E_Package
5806 and then Present (Renamed_Object (Inst_Par))
5808 Inst_Par := Renamed_Object (Inst_Par);
5811 if Ekind (Inst_Par) = E_Package then
5812 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5813 Gen_Par := Generic_Parent (Parent (Inst_Par));
5815 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5817 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5819 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5822 elsif Ekind (Inst_Par) = E_Generic_Package
5823 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5825 -- A formal package may be a real child package, and not the
5826 -- implicit instance within a parent. In this case the child is
5827 -- not visible and has to be retrieved explicitly as well.
5829 Gen_Par := Inst_Par;
5832 if Present (Gen_Par) then
5834 -- The prefix denotes an instantiation. The entity itself may be a
5835 -- nested generic, or a child unit.
5837 E := Find_Generic_Child (Gen_Par, S);
5840 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5841 Set_Entity (Gen_Id, E);
5842 Set_Etype (Gen_Id, Etype (E));
5844 Set_Etype (S, Etype (E));
5846 -- Indicate that this is a reference to the parent
5848 if In_Extended_Main_Source_Unit (Gen_Id) then
5849 Set_Is_Instantiated (Inst_Par);
5852 -- A common mistake is to replicate the naming scheme of a
5853 -- hierarchy by instantiating a generic child directly, rather
5854 -- than the implicit child in a parent instance:
5856 -- generic .. package Gpar is ..
5857 -- generic .. package Gpar.Child is ..
5858 -- package Par is new Gpar ();
5861 -- package Par.Child is new Gpar.Child ();
5862 -- rather than Par.Child
5864 -- In this case the instantiation is within Par, which is an
5865 -- instance, but Gpar does not denote Par because we are not IN
5866 -- the instance of Gpar, so this is illegal. The test below
5867 -- recognizes this particular case.
5869 if Is_Child_Unit (E)
5870 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5871 and then (not In_Instance
5872 or else Nkind (Parent (Parent (Gen_Id))) =
5876 ("prefix of generic child unit must be instance of parent",
5880 if not In_Open_Scopes (Inst_Par)
5881 and then Nkind (Parent (Gen_Id)) not in
5882 N_Generic_Renaming_Declaration
5884 Install_Parent (Inst_Par);
5885 Parent_Installed := True;
5887 elsif In_Open_Scopes (Inst_Par) then
5889 -- If the parent is already installed, install the actuals
5890 -- for its formal packages. This is necessary when the
5891 -- child instance is a child of the parent instance:
5892 -- in this case, the parent is placed on the scope stack
5893 -- but the formal packages are not made visible.
5895 Install_Formal_Packages (Inst_Par);
5899 -- If the generic parent does not contain an entity that
5900 -- corresponds to the selector, the instance doesn't either.
5901 -- Analyzing the node will yield the appropriate error message.
5902 -- If the entity is not a child unit, then it is an inner
5903 -- generic in the parent.
5911 if Is_Child_Unit (Entity (Gen_Id))
5913 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5914 and then not In_Open_Scopes (Inst_Par)
5916 Install_Parent (Inst_Par);
5917 Parent_Installed := True;
5919 -- The generic unit may be the renaming of the implicit child
5920 -- present in an instance. In that case the parent instance is
5921 -- obtained from the name of the renamed entity.
5923 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
5924 and then Present (Renamed_Entity (Entity (Gen_Id)))
5925 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
5928 Renamed_Package : constant Node_Id :=
5929 Name (Parent (Entity (Gen_Id)));
5931 if Nkind (Renamed_Package) = N_Expanded_Name then
5932 Inst_Par := Entity (Prefix (Renamed_Package));
5933 Install_Parent (Inst_Par);
5934 Parent_Installed := True;
5940 elsif Nkind (Gen_Id) = N_Expanded_Name then
5942 -- Entity already present, analyze prefix, whose meaning may be
5943 -- an instance in the current context. If it is an instance of
5944 -- a relative within another, the proper parent may still have
5945 -- to be installed, if they are not of the same generation.
5947 Analyze (Prefix (Gen_Id));
5949 -- In the unlikely case that a local declaration hides the name
5950 -- of the parent package, locate it on the homonym chain. If the
5951 -- context is an instance of the parent, the renaming entity is
5954 Inst_Par := Entity (Prefix (Gen_Id));
5955 while Present (Inst_Par)
5956 and then not Is_Package_Or_Generic_Package (Inst_Par)
5958 Inst_Par := Homonym (Inst_Par);
5961 pragma Assert (Present (Inst_Par));
5962 Set_Entity (Prefix (Gen_Id), Inst_Par);
5964 if In_Enclosing_Instance then
5967 elsif Present (Entity (Gen_Id))
5968 and then Is_Child_Unit (Entity (Gen_Id))
5969 and then not In_Open_Scopes (Inst_Par)
5971 Install_Parent (Inst_Par);
5972 Parent_Installed := True;
5975 elsif In_Enclosing_Instance then
5977 -- The child unit is found in some enclosing scope
5984 -- If this is the renaming of the implicit child in a parent
5985 -- instance, recover the parent name and install it.
5987 if Is_Entity_Name (Gen_Id) then
5988 E := Entity (Gen_Id);
5990 if Is_Generic_Unit (E)
5991 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5992 and then Is_Child_Unit (Renamed_Object (E))
5993 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5994 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5997 New_Copy_Tree (Name (Parent (E))));
5998 Inst_Par := Entity (Prefix (Gen_Id));
6000 if not In_Open_Scopes (Inst_Par) then
6001 Install_Parent (Inst_Par);
6002 Parent_Installed := True;
6005 -- If it is a child unit of a non-generic parent, it may be
6006 -- use-visible and given by a direct name. Install parent as
6009 elsif Is_Generic_Unit (E)
6010 and then Is_Child_Unit (E)
6012 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
6013 and then not Is_Generic_Unit (Scope (E))
6015 if not In_Open_Scopes (Scope (E)) then
6016 Install_Parent (Scope (E));
6017 Parent_Installed := True;
6022 end Check_Generic_Child_Unit;
6024 -----------------------------
6025 -- Check_Hidden_Child_Unit --
6026 -----------------------------
6028 procedure Check_Hidden_Child_Unit
6030 Gen_Unit : Entity_Id;
6031 Act_Decl_Id : Entity_Id)
6033 Gen_Id : constant Node_Id := Name (N);
6036 if Is_Child_Unit (Gen_Unit)
6037 and then Is_Child_Unit (Act_Decl_Id)
6038 and then Nkind (Gen_Id) = N_Expanded_Name
6039 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
6040 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
6042 Error_Msg_Node_2 := Scope (Act_Decl_Id);
6044 ("generic unit & is implicitly declared in &",
6045 Defining_Unit_Name (N), Gen_Unit);
6046 Error_Msg_N ("\instance must have different name",
6047 Defining_Unit_Name (N));
6049 end Check_Hidden_Child_Unit;
6051 ------------------------
6052 -- Check_Private_View --
6053 ------------------------
6055 procedure Check_Private_View (N : Node_Id) is
6056 T : constant Entity_Id := Etype (N);
6060 -- Exchange views if the type was not private in the generic but is
6061 -- private at the point of instantiation. Do not exchange views if
6062 -- the scope of the type is in scope. This can happen if both generic
6063 -- and instance are sibling units, or if type is defined in a parent.
6064 -- In this case the visibility of the type will be correct for all
6068 BT := Base_Type (T);
6070 if Is_Private_Type (T)
6071 and then not Has_Private_View (N)
6072 and then Present (Full_View (T))
6073 and then not In_Open_Scopes (Scope (T))
6075 -- In the generic, the full type was visible. Save the private
6076 -- entity, for subsequent exchange.
6080 elsif Has_Private_View (N)
6081 and then not Is_Private_Type (T)
6082 and then not Has_Been_Exchanged (T)
6083 and then Etype (Get_Associated_Node (N)) /= T
6085 -- Only the private declaration was visible in the generic. If
6086 -- the type appears in a subtype declaration, the subtype in the
6087 -- instance must have a view compatible with that of its parent,
6088 -- which must be exchanged (see corresponding code in Restore_
6089 -- Private_Views). Otherwise, if the type is defined in a parent
6090 -- unit, leave full visibility within instance, which is safe.
6092 if In_Open_Scopes (Scope (Base_Type (T)))
6093 and then not Is_Private_Type (Base_Type (T))
6094 and then Comes_From_Source (Base_Type (T))
6098 elsif Nkind (Parent (N)) = N_Subtype_Declaration
6099 or else not In_Private_Part (Scope (Base_Type (T)))
6101 Prepend_Elmt (T, Exchanged_Views);
6102 Exchange_Declarations (Etype (Get_Associated_Node (N)));
6105 -- For composite types with inconsistent representation exchange
6106 -- component types accordingly.
6108 elsif Is_Access_Type (T)
6109 and then Is_Private_Type (Designated_Type (T))
6110 and then not Has_Private_View (N)
6111 and then Present (Full_View (Designated_Type (T)))
6113 Switch_View (Designated_Type (T));
6115 elsif Is_Array_Type (T) then
6116 if Is_Private_Type (Component_Type (T))
6117 and then not Has_Private_View (N)
6118 and then Present (Full_View (Component_Type (T)))
6120 Switch_View (Component_Type (T));
6123 -- The normal exchange mechanism relies on the setting of a
6124 -- flag on the reference in the generic. However, an additional
6125 -- mechanism is needed for types that are not explicitly mentioned
6126 -- in the generic, but may be needed in expanded code in the
6127 -- instance. This includes component types of arrays and
6128 -- designated types of access types. This processing must also
6129 -- include the index types of arrays which we take care of here.
6136 Indx := First_Index (T);
6137 Typ := Base_Type (Etype (Indx));
6138 while Present (Indx) loop
6139 if Is_Private_Type (Typ)
6140 and then Present (Full_View (Typ))
6149 elsif Is_Private_Type (T)
6150 and then Present (Full_View (T))
6151 and then Is_Array_Type (Full_View (T))
6152 and then Is_Private_Type (Component_Type (Full_View (T)))
6156 -- Finally, a non-private subtype may have a private base type, which
6157 -- must be exchanged for consistency. This can happen when a package
6158 -- body is instantiated, when the scope stack is empty but in fact
6159 -- the subtype and the base type are declared in an enclosing scope.
6161 -- Note that in this case we introduce an inconsistency in the view
6162 -- set, because we switch the base type BT, but there could be some
6163 -- private dependent subtypes of BT which remain unswitched. Such
6164 -- subtypes might need to be switched at a later point (see specific
6165 -- provision for that case in Switch_View).
6167 elsif not Is_Private_Type (T)
6168 and then not Has_Private_View (N)
6169 and then Is_Private_Type (BT)
6170 and then Present (Full_View (BT))
6171 and then not Is_Generic_Type (BT)
6172 and then not In_Open_Scopes (BT)
6174 Prepend_Elmt (Full_View (BT), Exchanged_Views);
6175 Exchange_Declarations (BT);
6178 end Check_Private_View;
6180 -----------------------------
6181 -- Check_Hidden_Primitives --
6182 -----------------------------
6184 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is
6187 Result : Elist_Id := No_Elist;
6190 if No (Assoc_List) then
6194 -- Traverse the list of associations between formals and actuals
6195 -- searching for renamings of tagged types
6197 Actual := First (Assoc_List);
6198 while Present (Actual) loop
6199 if Nkind (Actual) = N_Subtype_Declaration then
6200 Gen_T := Generic_Parent_Type (Actual);
6203 and then Is_Tagged_Type (Gen_T)
6205 -- Traverse the list of primitives of the actual types
6206 -- searching for hidden primitives that are visible in the
6207 -- corresponding generic formal; leave them visible and
6208 -- append them to Result to restore their decoration later.
6210 Install_Hidden_Primitives
6211 (Prims_List => Result,
6213 Act_T => Entity (Subtype_Indication (Actual)));
6221 end Check_Hidden_Primitives;
6223 --------------------------
6224 -- Contains_Instance_Of --
6225 --------------------------
6227 function Contains_Instance_Of
6230 N : Node_Id) return Boolean
6238 -- Verify that there are no circular instantiations. We check whether
6239 -- the unit contains an instance of the current scope or some enclosing
6240 -- scope (in case one of the instances appears in a subunit). Longer
6241 -- circularities involving subunits might seem too pathological to
6242 -- consider, but they were not too pathological for the authors of
6243 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6244 -- enclosing generic scopes as containing an instance.
6247 -- Within a generic subprogram body, the scope is not generic, to
6248 -- allow for recursive subprograms. Use the declaration to determine
6249 -- whether this is a generic unit.
6251 if Ekind (Scop) = E_Generic_Package
6252 or else (Is_Subprogram (Scop)
6253 and then Nkind (Unit_Declaration_Node (Scop)) =
6254 N_Generic_Subprogram_Declaration)
6256 Elmt := First_Elmt (Inner_Instances (Inner));
6258 while Present (Elmt) loop
6259 if Node (Elmt) = Scop then
6260 Error_Msg_Node_2 := Inner;
6262 ("circular Instantiation: & instantiated within &!",
6266 elsif Node (Elmt) = Inner then
6269 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
6270 Error_Msg_Node_2 := Inner;
6272 ("circular Instantiation: & instantiated within &!",
6280 -- Indicate that Inner is being instantiated within Scop
6282 Append_Elmt (Inner, Inner_Instances (Scop));
6285 if Scop = Standard_Standard then
6288 Scop := Scope (Scop);
6293 end Contains_Instance_Of;
6295 -----------------------
6296 -- Copy_Generic_Node --
6297 -----------------------
6299 function Copy_Generic_Node
6301 Parent_Id : Node_Id;
6302 Instantiating : Boolean) return Node_Id
6307 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
6308 -- Check the given value of one of the Fields referenced by the
6309 -- current node to determine whether to copy it recursively. The
6310 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
6311 -- value (Sloc, Uint, Char) in which case it need not be copied.
6313 procedure Copy_Descendants;
6314 -- Common utility for various nodes
6316 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
6317 -- Make copy of element list
6319 function Copy_Generic_List
6321 Parent_Id : Node_Id) return List_Id;
6322 -- Apply Copy_Node recursively to the members of a node list
6324 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
6325 -- True if an identifier is part of the defining program unit name
6326 -- of a child unit. The entity of such an identifier must be kept
6327 -- (for ASIS use) even though as the name of an enclosing generic
6328 -- it would otherwise not be preserved in the generic tree.
6330 ----------------------
6331 -- Copy_Descendants --
6332 ----------------------
6334 procedure Copy_Descendants is
6336 use Atree.Unchecked_Access;
6337 -- This code section is part of the implementation of an untyped
6338 -- tree traversal, so it needs direct access to node fields.
6341 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6342 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6343 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6344 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
6345 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6346 end Copy_Descendants;
6348 -----------------------------
6349 -- Copy_Generic_Descendant --
6350 -----------------------------
6352 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
6354 if D = Union_Id (Empty) then
6357 elsif D in Node_Range then
6359 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
6361 elsif D in List_Range then
6362 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
6364 elsif D in Elist_Range then
6365 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
6367 -- Nothing else is copyable (e.g. Uint values), return as is
6372 end Copy_Generic_Descendant;
6374 ------------------------
6375 -- Copy_Generic_Elist --
6376 ------------------------
6378 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
6385 M := First_Elmt (E);
6386 while Present (M) loop
6388 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6397 end Copy_Generic_Elist;
6399 -----------------------
6400 -- Copy_Generic_List --
6401 -----------------------
6403 function Copy_Generic_List
6405 Parent_Id : Node_Id) return List_Id
6413 Set_Parent (New_L, Parent_Id);
6416 while Present (N) loop
6417 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6426 end Copy_Generic_List;
6428 ---------------------------
6429 -- In_Defining_Unit_Name --
6430 ---------------------------
6432 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6434 return Present (Parent (Nam))
6435 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6437 (Nkind (Parent (Nam)) = N_Expanded_Name
6438 and then In_Defining_Unit_Name (Parent (Nam))));
6439 end In_Defining_Unit_Name;
6441 -- Start of processing for Copy_Generic_Node
6448 New_N := New_Copy (N);
6450 -- Copy aspects if present
6452 if Has_Aspects (N) then
6453 Set_Has_Aspects (New_N, False);
6454 Set_Aspect_Specifications
6455 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6458 if Instantiating then
6459 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6462 if not Is_List_Member (N) then
6463 Set_Parent (New_N, Parent_Id);
6466 -- If defining identifier, then all fields have been copied already
6468 if Nkind (New_N) in N_Entity then
6471 -- Special casing for identifiers and other entity names and operators
6473 elsif Nkind_In (New_N, N_Identifier,
6474 N_Character_Literal,
6477 or else Nkind (New_N) in N_Op
6479 if not Instantiating then
6481 -- Link both nodes in order to assign subsequently the entity of
6482 -- the copy to the original node, in case this is a global
6485 Set_Associated_Node (N, New_N);
6487 -- If we are within an instantiation, this is a nested generic
6488 -- that has already been analyzed at the point of definition. We
6489 -- must preserve references that were global to the enclosing
6490 -- parent at that point. Other occurrences, whether global or
6491 -- local to the current generic, must be resolved anew, so we
6492 -- reset the entity in the generic copy. A global reference has a
6493 -- smaller depth than the parent, or else the same depth in case
6494 -- both are distinct compilation units.
6495 -- A child unit is implicitly declared within the enclosing parent
6496 -- but is in fact global to it, and must be preserved.
6498 -- It is also possible for Current_Instantiated_Parent to be
6499 -- defined, and for this not to be a nested generic, namely if the
6500 -- unit is loaded through Rtsfind. In that case, the entity of
6501 -- New_N is only a link to the associated node, and not a defining
6504 -- The entities for parent units in the defining_program_unit of a
6505 -- generic child unit are established when the context of the unit
6506 -- is first analyzed, before the generic copy is made. They are
6507 -- preserved in the copy for use in ASIS queries.
6509 Ent := Entity (New_N);
6511 if No (Current_Instantiated_Parent.Gen_Id) then
6513 or else Nkind (Ent) /= N_Defining_Identifier
6514 or else not In_Defining_Unit_Name (N)
6516 Set_Associated_Node (New_N, Empty);
6521 not Nkind_In (Ent, N_Defining_Identifier,
6522 N_Defining_Character_Literal,
6523 N_Defining_Operator_Symbol)
6524 or else No (Scope (Ent))
6526 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6527 and then not Is_Child_Unit (Ent))
6529 (Scope_Depth (Scope (Ent)) >
6530 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6532 Get_Source_Unit (Ent) =
6533 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6535 Set_Associated_Node (New_N, Empty);
6538 -- Case of instantiating identifier or some other name or operator
6541 -- If the associated node is still defined, the entity in it is
6542 -- global, and must be copied to the instance. If this copy is
6543 -- being made for a body to inline, it is applied to an
6544 -- instantiated tree, and the entity is already present and must
6545 -- be also preserved.
6548 Assoc : constant Node_Id := Get_Associated_Node (N);
6551 if Present (Assoc) then
6552 if Nkind (Assoc) = Nkind (N) then
6553 Set_Entity (New_N, Entity (Assoc));
6554 Check_Private_View (N);
6556 elsif Nkind (Assoc) = N_Function_Call then
6557 Set_Entity (New_N, Entity (Name (Assoc)));
6559 elsif Nkind_In (Assoc, N_Defining_Identifier,
6560 N_Defining_Character_Literal,
6561 N_Defining_Operator_Symbol)
6562 and then Expander_Active
6564 -- Inlining case: we are copying a tree that contains
6565 -- global entities, which are preserved in the copy to be
6566 -- used for subsequent inlining.
6571 Set_Entity (New_N, Empty);
6577 -- For expanded name, we must copy the Prefix and Selector_Name
6579 if Nkind (N) = N_Expanded_Name then
6581 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6583 Set_Selector_Name (New_N,
6584 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6586 -- For operators, we must copy the right operand
6588 elsif Nkind (N) in N_Op then
6589 Set_Right_Opnd (New_N,
6590 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6592 -- And for binary operators, the left operand as well
6594 if Nkind (N) in N_Binary_Op then
6595 Set_Left_Opnd (New_N,
6596 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6600 -- Special casing for stubs
6602 elsif Nkind (N) in N_Body_Stub then
6604 -- In any case, we must copy the specification or defining
6605 -- identifier as appropriate.
6607 if Nkind (N) = N_Subprogram_Body_Stub then
6608 Set_Specification (New_N,
6609 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6612 Set_Defining_Identifier (New_N,
6614 (Defining_Identifier (N), New_N, Instantiating));
6617 -- If we are not instantiating, then this is where we load and
6618 -- analyze subunits, i.e. at the point where the stub occurs. A
6619 -- more permissive system might defer this analysis to the point
6620 -- of instantiation, but this seems to complicated for now.
6622 if not Instantiating then
6624 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6626 Unum : Unit_Number_Type;
6630 -- Make sure that, if it is a subunit of the main unit that is
6631 -- preprocessed and if -gnateG is specified, the preprocessed
6632 -- file will be written.
6634 Lib.Analysing_Subunit_Of_Main :=
6635 Lib.In_Extended_Main_Source_Unit (N);
6638 (Load_Name => Subunit_Name,
6642 Lib.Analysing_Subunit_Of_Main := False;
6644 -- If the proper body is not found, a warning message will be
6645 -- emitted when analyzing the stub, or later at the point
6646 -- of instantiation. Here we just leave the stub as is.
6648 if Unum = No_Unit then
6649 Subunits_Missing := True;
6650 goto Subunit_Not_Found;
6653 Subunit := Cunit (Unum);
6655 if Nkind (Unit (Subunit)) /= N_Subunit then
6657 ("found child unit instead of expected SEPARATE subunit",
6659 Error_Msg_Sloc := Sloc (N);
6660 Error_Msg_N ("\to complete stub #", Subunit);
6661 goto Subunit_Not_Found;
6664 -- We must create a generic copy of the subunit, in order to
6665 -- perform semantic analysis on it, and we must replace the
6666 -- stub in the original generic unit with the subunit, in order
6667 -- to preserve non-local references within.
6669 -- Only the proper body needs to be copied. Library_Unit and
6670 -- context clause are simply inherited by the generic copy.
6671 -- Note that the copy (which may be recursive if there are
6672 -- nested subunits) must be done first, before attaching it to
6673 -- the enclosing generic.
6677 (Proper_Body (Unit (Subunit)),
6678 Empty, Instantiating => False);
6680 -- Now place the original proper body in the original generic
6681 -- unit. This is a body, not a compilation unit.
6683 Rewrite (N, Proper_Body (Unit (Subunit)));
6684 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6685 Set_Was_Originally_Stub (N);
6687 -- Finally replace the body of the subunit with its copy, and
6688 -- make this new subunit into the library unit of the generic
6689 -- copy, which does not have stubs any longer.
6691 Set_Proper_Body (Unit (Subunit), New_Body);
6692 Set_Library_Unit (New_N, Subunit);
6693 Inherit_Context (Unit (Subunit), N);
6696 -- If we are instantiating, this must be an error case, since
6697 -- otherwise we would have replaced the stub node by the proper body
6698 -- that corresponds. So just ignore it in the copy (i.e. we have
6699 -- copied it, and that is good enough).
6705 <<Subunit_Not_Found>> null;
6707 -- If the node is a compilation unit, it is the subunit of a stub, which
6708 -- has been loaded already (see code below). In this case, the library
6709 -- unit field of N points to the parent unit (which is a compilation
6710 -- unit) and need not (and cannot!) be copied.
6712 -- When the proper body of the stub is analyzed, the library_unit link
6713 -- is used to establish the proper context (see sem_ch10).
6715 -- The other fields of a compilation unit are copied as usual
6717 elsif Nkind (N) = N_Compilation_Unit then
6719 -- This code can only be executed when not instantiating, because in
6720 -- the copy made for an instantiation, the compilation unit node has
6721 -- disappeared at the point that a stub is replaced by its proper
6724 pragma Assert (not Instantiating);
6726 Set_Context_Items (New_N,
6727 Copy_Generic_List (Context_Items (N), New_N));
6730 Copy_Generic_Node (Unit (N), New_N, False));
6732 Set_First_Inlined_Subprogram (New_N,
6734 (First_Inlined_Subprogram (N), New_N, False));
6736 Set_Aux_Decls_Node (New_N,
6737 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6739 -- For an assignment node, the assignment is known to be semantically
6740 -- legal if we are instantiating the template. This avoids incorrect
6741 -- diagnostics in generated code.
6743 elsif Nkind (N) = N_Assignment_Statement then
6745 -- Copy name and expression fields in usual manner
6748 Copy_Generic_Node (Name (N), New_N, Instantiating));
6750 Set_Expression (New_N,
6751 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6753 if Instantiating then
6754 Set_Assignment_OK (Name (New_N), True);
6757 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6758 if not Instantiating then
6759 Set_Associated_Node (N, New_N);
6762 if Present (Get_Associated_Node (N))
6763 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6765 -- In the generic the aggregate has some composite type. If at
6766 -- the point of instantiation the type has a private view,
6767 -- install the full view (and that of its ancestors, if any).
6770 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6775 and then Is_Private_Type (T)
6781 and then Is_Tagged_Type (T)
6782 and then Is_Derived_Type (T)
6784 Rt := Root_Type (T);
6789 if Is_Private_Type (T) then
6800 -- Do not copy the associated node, which points to the generic copy
6801 -- of the aggregate.
6804 use Atree.Unchecked_Access;
6805 -- This code section is part of the implementation of an untyped
6806 -- tree traversal, so it needs direct access to node fields.
6809 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6810 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6811 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6812 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6815 -- Allocators do not have an identifier denoting the access type, so we
6816 -- must locate it through the expression to check whether the views are
6819 elsif Nkind (N) = N_Allocator
6820 and then Nkind (Expression (N)) = N_Qualified_Expression
6821 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6822 and then Instantiating
6825 T : constant Node_Id :=
6826 Get_Associated_Node (Subtype_Mark (Expression (N)));
6832 -- Retrieve the allocator node in the generic copy
6834 Acc_T := Etype (Parent (Parent (T)));
6836 and then Is_Private_Type (Acc_T)
6838 Switch_View (Acc_T);
6845 -- For a proper body, we must catch the case of a proper body that
6846 -- replaces a stub. This represents the point at which a separate
6847 -- compilation unit, and hence template file, may be referenced, so we
6848 -- must make a new source instantiation entry for the template of the
6849 -- subunit, and ensure that all nodes in the subunit are adjusted using
6850 -- this new source instantiation entry.
6852 elsif Nkind (N) in N_Proper_Body then
6854 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6857 if Instantiating and then Was_Originally_Stub (N) then
6858 Create_Instantiation_Source
6859 (Instantiation_Node,
6860 Defining_Entity (N),
6865 -- Now copy the fields of the proper body, using the new
6866 -- adjustment factor if one was needed as per test above.
6870 -- Restore the original adjustment factor in case changed
6872 S_Adjustment := Save_Adjustment;
6875 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6876 -- generic unit, not to the instantiating unit.
6878 elsif Nkind (N) = N_Pragma and then Instantiating then
6880 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6882 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6883 New_N := Make_Null_Statement (Sloc (N));
6890 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
6892 -- No descendant fields need traversing
6896 elsif Nkind (N) = N_String_Literal
6897 and then Present (Etype (N))
6898 and then Instantiating
6900 -- If the string is declared in an outer scope, the string_literal
6901 -- subtype created for it may have the wrong scope. We force the
6902 -- reanalysis of the constant to generate a new itype in the proper
6905 Set_Etype (New_N, Empty);
6906 Set_Analyzed (New_N, False);
6908 -- For the remaining nodes, copy their descendants recursively
6913 if Instantiating and then Nkind (N) = N_Subprogram_Body then
6914 Set_Generic_Parent (Specification (New_N), N);
6916 -- Should preserve Corresponding_Spec??? (12.3(14))
6921 end Copy_Generic_Node;
6923 ----------------------------
6924 -- Denotes_Formal_Package --
6925 ----------------------------
6927 function Denotes_Formal_Package
6929 On_Exit : Boolean := False;
6930 Instance : Entity_Id := Empty) return Boolean
6933 Scop : constant Entity_Id := Scope (Pack);
6936 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6937 -- The package in question may be an actual for a previous formal
6938 -- package P of the current instance, so examine its actuals as well.
6939 -- This must be recursive over other formal packages.
6941 ----------------------------------
6942 -- Is_Actual_Of_Previous_Formal --
6943 ----------------------------------
6945 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6949 E1 := First_Entity (P);
6950 while Present (E1) and then E1 /= Instance loop
6951 if Ekind (E1) = E_Package
6952 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6954 if Renamed_Object (E1) = Pack then
6957 elsif E1 = P or else Renamed_Object (E1) = P then
6960 elsif Is_Actual_Of_Previous_Formal (E1) then
6969 end Is_Actual_Of_Previous_Formal;
6971 -- Start of processing for Denotes_Formal_Package
6977 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6979 Par := Current_Instantiated_Parent.Act_Id;
6982 if Ekind (Scop) = E_Generic_Package
6983 or else Nkind (Unit_Declaration_Node (Scop)) =
6984 N_Generic_Subprogram_Declaration
6988 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6989 N_Formal_Package_Declaration
6997 -- Check whether this package is associated with a formal package of
6998 -- the enclosing instantiation. Iterate over the list of renamings.
7000 E := First_Entity (Par);
7001 while Present (E) loop
7002 if Ekind (E) /= E_Package
7003 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
7007 elsif Renamed_Object (E) = Par then
7010 elsif Renamed_Object (E) = Pack then
7013 elsif Is_Actual_Of_Previous_Formal (E) then
7023 end Denotes_Formal_Package;
7029 procedure End_Generic is
7031 -- ??? More things could be factored out in this routine. Should
7032 -- probably be done at a later stage.
7034 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
7035 Generic_Flags.Decrement_Last;
7037 Expander_Mode_Restore;
7044 function Earlier (N1, N2 : Node_Id) return Boolean is
7045 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
7046 -- Find distance from given node to enclosing compilation unit
7052 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
7055 and then Nkind (P) /= N_Compilation_Unit
7057 P := True_Parent (P);
7062 -- Local declarations
7069 -- Start of processing for Earlier
7072 Find_Depth (P1, D1);
7073 Find_Depth (P2, D2);
7083 P1 := True_Parent (P1);
7088 P2 := True_Parent (P2);
7092 -- At this point P1 and P2 are at the same distance from the root.
7093 -- We examine their parents until we find a common declarative list.
7094 -- If we reach the root, N1 and N2 do not descend from the same
7095 -- declarative list (e.g. one is nested in the declarative part and
7096 -- the other is in a block in the statement part) and the earlier
7097 -- one is already frozen.
7099 while not Is_List_Member (P1)
7100 or else not Is_List_Member (P2)
7101 or else List_Containing (P1) /= List_Containing (P2)
7103 P1 := True_Parent (P1);
7104 P2 := True_Parent (P2);
7106 if Nkind (Parent (P1)) = N_Subunit then
7107 P1 := Corresponding_Stub (Parent (P1));
7110 if Nkind (Parent (P2)) = N_Subunit then
7111 P2 := Corresponding_Stub (Parent (P2));
7119 -- Expanded code usually shares the source location of the original
7120 -- construct it was generated for. This however may not necessarely
7121 -- reflect the true location of the code within the tree.
7123 -- Before comparing the slocs of the two nodes, make sure that we are
7124 -- working with correct source locations. Assume that P1 is to the left
7125 -- of P2. If either one does not come from source, traverse the common
7126 -- list heading towards the other node and locate the first source
7130 -- ----+===+===+--------------+===+===+----
7131 -- expanded code expanded code
7133 if not Comes_From_Source (P1) then
7134 while Present (P1) loop
7136 -- Neither P2 nor a source statement were located during the
7137 -- search. If we reach the end of the list, then P1 does not
7138 -- occur earlier than P2.
7141 -- start --- P2 ----- P1 --- end
7143 if No (Next (P1)) then
7146 -- We encounter P2 while going to the right of the list. This
7147 -- means that P1 does indeed appear earlier.
7150 -- start --- P1 ===== P2 --- end
7151 -- expanded code in between
7156 -- No need to look any further since we have located a source
7159 elsif Comes_From_Source (P1) then
7169 if not Comes_From_Source (P2) then
7170 while Present (P2) loop
7172 -- Neither P1 nor a source statement were located during the
7173 -- search. If we reach the start of the list, then P1 does not
7174 -- occur earlier than P2.
7177 -- start --- P2 --- P1 --- end
7179 if No (Prev (P2)) then
7182 -- We encounter P1 while going to the left of the list. This
7183 -- means that P1 does indeed appear earlier.
7186 -- start --- P1 ===== P2 --- end
7187 -- expanded code in between
7192 -- No need to look any further since we have located a source
7195 elsif Comes_From_Source (P2) then
7205 -- At this point either both nodes came from source or we approximated
7206 -- their source locations through neighbouring source statements.
7208 -- When two nodes come from the same instance, they have identical top
7209 -- level locations. To determine proper relation within the tree, check
7210 -- their locations within the template.
7212 if Top_Level_Location (Sloc (P1)) = Top_Level_Location (Sloc (P2)) then
7213 return Sloc (P1) < Sloc (P2);
7215 -- The two nodes either come from unrelated instances or do not come
7216 -- from instantiated code at all.
7219 return Top_Level_Location (Sloc (P1))
7220 < Top_Level_Location (Sloc (P2));
7224 ----------------------
7225 -- Find_Actual_Type --
7226 ----------------------
7228 function Find_Actual_Type
7230 Gen_Type : Entity_Id) return Entity_Id
7232 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
7236 -- Special processing only applies to child units
7238 if not Is_Child_Unit (Gen_Scope) then
7239 return Get_Instance_Of (Typ);
7241 -- If designated or component type is itself a formal of the child unit,
7242 -- its instance is available.
7244 elsif Scope (Typ) = Gen_Scope then
7245 return Get_Instance_Of (Typ);
7247 -- If the array or access type is not declared in the parent unit,
7248 -- no special processing needed.
7250 elsif not Is_Generic_Type (Typ)
7251 and then Scope (Gen_Scope) /= Scope (Typ)
7253 return Get_Instance_Of (Typ);
7255 -- Otherwise, retrieve designated or component type by visibility
7258 T := Current_Entity (Typ);
7259 while Present (T) loop
7260 if In_Open_Scopes (Scope (T)) then
7263 elsif Is_Generic_Actual_Type (T) then
7272 end Find_Actual_Type;
7274 ----------------------------
7275 -- Freeze_Subprogram_Body --
7276 ----------------------------
7278 procedure Freeze_Subprogram_Body
7279 (Inst_Node : Node_Id;
7281 Pack_Id : Entity_Id)
7283 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7284 Par : constant Entity_Id := Scope (Gen_Unit);
7290 function Enclosing_Package_Body (N : Node_Id) return Node_Id;
7291 -- Find innermost package body that encloses the given node, and which
7292 -- is not a compilation unit. Freeze nodes for the instance, or for its
7293 -- enclosing body, may be inserted after the enclosing_body of the
7294 -- generic unit. Used to determine proper placement of freeze node for
7295 -- both package and subprogram instances.
7297 function Package_Freeze_Node (B : Node_Id) return Node_Id;
7298 -- Find entity for given package body, and locate or create a freeze
7301 ----------------------------
7302 -- Enclosing_Package_Body --
7303 ----------------------------
7305 function Enclosing_Package_Body (N : Node_Id) return Node_Id is
7311 and then Nkind (Parent (P)) /= N_Compilation_Unit
7313 if Nkind (P) = N_Package_Body then
7314 if Nkind (Parent (P)) = N_Subunit then
7315 return Corresponding_Stub (Parent (P));
7321 P := True_Parent (P);
7325 end Enclosing_Package_Body;
7327 -------------------------
7328 -- Package_Freeze_Node --
7329 -------------------------
7331 function Package_Freeze_Node (B : Node_Id) return Node_Id is
7335 if Nkind (B) = N_Package_Body then
7336 Id := Corresponding_Spec (B);
7337 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
7338 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
7341 Ensure_Freeze_Node (Id);
7342 return Freeze_Node (Id);
7343 end Package_Freeze_Node;
7345 -- Start of processing of Freeze_Subprogram_Body
7348 -- If the instance and the generic body appear within the same unit, and
7349 -- the instance precedes the generic, the freeze node for the instance
7350 -- must appear after that of the generic. If the generic is nested
7351 -- within another instance I2, then current instance must be frozen
7352 -- after I2. In both cases, the freeze nodes are those of enclosing
7353 -- packages. Otherwise, the freeze node is placed at the end of the
7354 -- current declarative part.
7356 Enc_G := Enclosing_Package_Body (Gen_Body);
7357 Enc_I := Enclosing_Package_Body (Inst_Node);
7358 Ensure_Freeze_Node (Pack_Id);
7359 F_Node := Freeze_Node (Pack_Id);
7361 if Is_Generic_Instance (Par)
7362 and then Present (Freeze_Node (Par))
7363 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
7365 -- The parent was a premature instantiation. Insert freeze node at
7366 -- the end the current declarative part.
7368 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
7369 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7371 -- Handle the following case:
7373 -- package Parent_Inst is new ...
7376 -- procedure P ... -- this body freezes Parent_Inst
7378 -- package Inst is new ...
7380 -- In this particular scenario, the freeze node for Inst must be
7381 -- inserted in the same manner as that of Parent_Inst - before the
7382 -- next source body or at the end of the declarative list (body not
7383 -- available). If body P did not exist and Parent_Inst was frozen
7384 -- after Inst, either by a body following Inst or at the end of the
7385 -- declarative region, the freeze node for Inst must be inserted
7386 -- after that of Parent_Inst. This relation is established by
7387 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7389 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
7390 List_Containing (Inst_Node)
7391 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
7393 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7396 Insert_After (Freeze_Node (Par), F_Node);
7399 -- The body enclosing the instance should be frozen after the body that
7400 -- includes the generic, because the body of the instance may make
7401 -- references to entities therein. If the two are not in the same
7402 -- declarative part, or if the one enclosing the instance is frozen
7403 -- already, freeze the instance at the end of the current declarative
7406 elsif Is_Generic_Instance (Par)
7407 and then Present (Freeze_Node (Par))
7408 and then Present (Enc_I)
7410 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
7412 (Nkind (Enc_I) = N_Package_Body
7414 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
7416 -- The enclosing package may contain several instances. Rather
7417 -- than computing the earliest point at which to insert its freeze
7418 -- node, we place it at the end of the declarative part of the
7419 -- parent of the generic.
7421 Insert_Freeze_Node_For_Instance
7422 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
7425 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7427 elsif Present (Enc_G)
7428 and then Present (Enc_I)
7429 and then Enc_G /= Enc_I
7430 and then Earlier (Inst_Node, Gen_Body)
7432 if Nkind (Enc_G) = N_Package_Body then
7433 E_G_Id := Corresponding_Spec (Enc_G);
7434 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
7436 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
7439 -- Freeze package that encloses instance, and place node after
7440 -- package that encloses generic. If enclosing package is already
7441 -- frozen we have to assume it is at the proper place. This may be a
7442 -- potential ABE that requires dynamic checking. Do not add a freeze
7443 -- node if the package that encloses the generic is inside the body
7444 -- that encloses the instance, because the freeze node would be in
7445 -- the wrong scope. Additional contortions needed if the bodies are
7446 -- within a subunit.
7449 Enclosing_Body : Node_Id;
7452 if Nkind (Enc_I) = N_Package_Body_Stub then
7453 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
7455 Enclosing_Body := Enc_I;
7458 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
7459 Insert_Freeze_Node_For_Instance
7460 (Enc_G, Package_Freeze_Node (Enc_I));
7464 -- Freeze enclosing subunit before instance
7466 Ensure_Freeze_Node (E_G_Id);
7468 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7469 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7472 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7475 -- If none of the above, insert freeze node at the end of the current
7476 -- declarative part.
7478 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7480 end Freeze_Subprogram_Body;
7486 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7488 return Generic_Renamings.Table (E).Gen_Id;
7491 ---------------------
7492 -- Get_Instance_Of --
7493 ---------------------
7495 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7496 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7499 if Res /= Assoc_Null then
7500 return Generic_Renamings.Table (Res).Act_Id;
7502 -- On exit, entity is not instantiated: not a generic parameter, or
7503 -- else parameter of an inner generic unit.
7507 end Get_Instance_Of;
7509 ------------------------------------
7510 -- Get_Package_Instantiation_Node --
7511 ------------------------------------
7513 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7514 Decl : Node_Id := Unit_Declaration_Node (A);
7518 -- If the Package_Instantiation attribute has been set on the package
7519 -- entity, then use it directly when it (or its Original_Node) refers
7520 -- to an N_Package_Instantiation node. In principle it should be
7521 -- possible to have this field set in all cases, which should be
7522 -- investigated, and would allow this function to be significantly
7525 Inst := Package_Instantiation (A);
7527 if Present (Inst) then
7528 if Nkind (Inst) = N_Package_Instantiation then
7531 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7532 return Original_Node (Inst);
7536 -- If the instantiation is a compilation unit that does not need body
7537 -- then the instantiation node has been rewritten as a package
7538 -- declaration for the instance, and we return the original node.
7540 -- If it is a compilation unit and the instance node has not been
7541 -- rewritten, then it is still the unit of the compilation. Finally, if
7542 -- a body is present, this is a parent of the main unit whose body has
7543 -- been compiled for inlining purposes, and the instantiation node has
7544 -- been rewritten with the instance body.
7546 -- Otherwise the instantiation node appears after the declaration. If
7547 -- the entity is a formal package, the declaration may have been
7548 -- rewritten as a generic declaration (in the case of a formal with box)
7549 -- or left as a formal package declaration if it has actuals, and is
7550 -- found with a forward search.
7552 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7553 if Nkind (Decl) = N_Package_Declaration
7554 and then Present (Corresponding_Body (Decl))
7556 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7559 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7560 return Original_Node (Decl);
7562 return Unit (Parent (Decl));
7565 elsif Nkind (Decl) = N_Package_Declaration
7566 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7568 return Original_Node (Decl);
7571 Inst := Next (Decl);
7572 while not Nkind_In (Inst, N_Package_Instantiation,
7573 N_Formal_Package_Declaration)
7580 end Get_Package_Instantiation_Node;
7582 ------------------------
7583 -- Has_Been_Exchanged --
7584 ------------------------
7586 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7590 Next := First_Elmt (Exchanged_Views);
7591 while Present (Next) loop
7592 if Full_View (Node (Next)) = E then
7600 end Has_Been_Exchanged;
7606 function Hash (F : Entity_Id) return HTable_Range is
7608 return HTable_Range (F mod HTable_Size);
7611 ------------------------
7612 -- Hide_Current_Scope --
7613 ------------------------
7615 procedure Hide_Current_Scope is
7616 C : constant Entity_Id := Current_Scope;
7620 Set_Is_Hidden_Open_Scope (C);
7622 E := First_Entity (C);
7623 while Present (E) loop
7624 if Is_Immediately_Visible (E) then
7625 Set_Is_Immediately_Visible (E, False);
7626 Append_Elmt (E, Hidden_Entities);
7632 -- Make the scope name invisible as well. This is necessary, but might
7633 -- conflict with calls to Rtsfind later on, in case the scope is a
7634 -- predefined one. There is no clean solution to this problem, so for
7635 -- now we depend on the user not redefining Standard itself in one of
7636 -- the parent units.
7638 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7639 Set_Is_Immediately_Visible (C, False);
7640 Append_Elmt (C, Hidden_Entities);
7643 end Hide_Current_Scope;
7649 procedure Init_Env is
7650 Saved : Instance_Env;
7653 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7654 Saved.Exchanged_Views := Exchanged_Views;
7655 Saved.Hidden_Entities := Hidden_Entities;
7656 Saved.Current_Sem_Unit := Current_Sem_Unit;
7657 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7658 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7660 -- Save configuration switches. These may be reset if the unit is a
7661 -- predefined unit, and the current mode is not Ada 2005.
7663 Save_Opt_Config_Switches (Saved.Switches);
7665 Instance_Envs.Append (Saved);
7667 Exchanged_Views := New_Elmt_List;
7668 Hidden_Entities := New_Elmt_List;
7670 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7671 -- this is set properly in Set_Instance_Env.
7673 Current_Instantiated_Parent :=
7674 (Current_Scope, Current_Scope, Assoc_Null);
7677 ------------------------------
7678 -- In_Same_Declarative_Part --
7679 ------------------------------
7681 function In_Same_Declarative_Part
7683 Inst : Node_Id) return Boolean
7685 Decls : constant Node_Id := Parent (F_Node);
7686 Nod : Node_Id := Parent (Inst);
7689 while Present (Nod) loop
7693 elsif Nkind_In (Nod, N_Subprogram_Body,
7695 N_Package_Declaration,
7702 elsif Nkind (Nod) = N_Subunit then
7703 Nod := Corresponding_Stub (Nod);
7705 elsif Nkind (Nod) = N_Compilation_Unit then
7709 Nod := Parent (Nod);
7714 end In_Same_Declarative_Part;
7716 ---------------------
7717 -- In_Main_Context --
7718 ---------------------
7720 function In_Main_Context (E : Entity_Id) return Boolean is
7726 if not Is_Compilation_Unit (E)
7727 or else Ekind (E) /= E_Package
7728 or else In_Private_Part (E)
7733 Context := Context_Items (Cunit (Main_Unit));
7735 Clause := First (Context);
7736 while Present (Clause) loop
7737 if Nkind (Clause) = N_With_Clause then
7738 Nam := Name (Clause);
7740 -- If the current scope is part of the context of the main unit,
7741 -- analysis of the corresponding with_clause is not complete, and
7742 -- the entity is not set. We use the Chars field directly, which
7743 -- might produce false positives in rare cases, but guarantees
7744 -- that we produce all the instance bodies we will need.
7746 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7747 or else (Nkind (Nam) = N_Selected_Component
7748 and then Chars (Selector_Name (Nam)) = Chars (E))
7758 end In_Main_Context;
7760 ---------------------
7761 -- Inherit_Context --
7762 ---------------------
7764 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7765 Current_Context : List_Id;
7766 Current_Unit : Node_Id;
7771 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7773 -- The inherited context is attached to the enclosing compilation
7774 -- unit. This is either the main unit, or the declaration for the
7775 -- main unit (in case the instantiation appears within the package
7776 -- declaration and the main unit is its body).
7778 Current_Unit := Parent (Inst);
7779 while Present (Current_Unit)
7780 and then Nkind (Current_Unit) /= N_Compilation_Unit
7782 Current_Unit := Parent (Current_Unit);
7785 Current_Context := Context_Items (Current_Unit);
7787 Item := First (Context_Items (Parent (Gen_Decl)));
7788 while Present (Item) loop
7789 if Nkind (Item) = N_With_Clause then
7791 -- Take care to prevent direct cyclic with's, which can happen
7792 -- if the generic body with's the current unit. Such a case
7793 -- would result in binder errors (or run-time errors if the
7794 -- -gnatE switch is in effect), but we want to prevent it here,
7795 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7796 -- that we don't bother to detect indirect cycles.
7798 if Library_Unit (Item) /= Current_Unit then
7799 New_I := New_Copy (Item);
7800 Set_Implicit_With (New_I, True);
7801 Append (New_I, Current_Context);
7808 end Inherit_Context;
7814 procedure Initialize is
7816 Generic_Renamings.Init;
7819 Generic_Renamings_HTable.Reset;
7820 Circularity_Detected := False;
7821 Exchanged_Views := No_Elist;
7822 Hidden_Entities := No_Elist;
7825 -------------------------------------
7826 -- Insert_Freeze_Node_For_Instance --
7827 -------------------------------------
7829 procedure Insert_Freeze_Node_For_Instance
7833 Inst : constant Entity_Id := Entity (F_Node);
7838 function Enclosing_Body (N : Node_Id) return Node_Id;
7839 -- Find enclosing package or subprogram body, if any. Freeze node
7840 -- may be placed at end of current declarative list if previous
7841 -- instance and current one have different enclosing bodies.
7843 function Previous_Instance (Gen : Entity_Id) return Entity_Id;
7844 -- Find the local instance, if any, that declares the generic that is
7845 -- being instantiated. If present, the freeze node for this instance
7846 -- must follow the freeze node for the previous instance.
7848 --------------------
7849 -- Enclosing_Body --
7850 --------------------
7852 function Enclosing_Body (N : Node_Id) return Node_Id is
7858 and then Nkind (Parent (P)) /= N_Compilation_Unit
7860 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then
7861 if Nkind (Parent (P)) = N_Subunit then
7862 return Corresponding_Stub (Parent (P));
7868 P := True_Parent (P);
7874 -----------------------
7875 -- Previous_Instance --
7876 -----------------------
7878 function Previous_Instance (Gen : Entity_Id) return Entity_Id is
7884 and then S /= Standard_Standard
7886 if Is_Generic_Instance (S)
7887 and then In_Same_Source_Unit (S, N)
7896 end Previous_Instance;
7898 -- Start of processing for Insert_Freeze_Node_For_Instance
7901 if not Is_List_Member (F_Node) then
7902 Decls := List_Containing (N);
7903 Par_N := Parent (Decls);
7906 -- If this is a package instance, check whether the generic is
7907 -- declared in a previous instance and the current instance is
7908 -- not within the previous one.
7910 if Present (Generic_Parent (Parent (Inst)))
7911 and then Is_In_Main_Unit (N)
7914 Enclosing_N : constant Node_Id := Enclosing_Body (N);
7915 Par_I : constant Entity_Id :=
7917 (Generic_Parent (Parent (Inst)));
7922 and then Earlier (N, Freeze_Node (Par_I))
7924 Scop := Scope (Inst);
7926 -- If the current instance is within the one that contains
7927 -- the generic, the freeze node for the current one must
7928 -- appear in the current declarative part. Ditto, if the
7929 -- current instance is within another package instance or
7930 -- within a body that does not enclose the current instance.
7931 -- In these three cases the freeze node of the previous
7932 -- instance is not relevant.
7934 while Present (Scop)
7935 and then Scop /= Standard_Standard
7937 exit when Scop = Par_I
7939 (Is_Generic_Instance (Scop)
7940 and then Scope_Depth (Scop) > Scope_Depth (Par_I));
7941 Scop := Scope (Scop);
7944 -- Previous instance encloses current instance
7946 if Scop = Par_I then
7949 -- If the next node is a source body we must freeze in
7950 -- the current scope as well.
7952 elsif Present (Next (N))
7953 and then Nkind_In (Next (N),
7954 N_Subprogram_Body, N_Package_Body)
7955 and then Comes_From_Source (Next (N))
7959 -- Current instance is within an unrelated instance
7961 elsif Is_Generic_Instance (Scop) then
7964 -- Current instance is within an unrelated body
7966 elsif Present (Enclosing_N)
7967 and then Enclosing_N /= Enclosing_Body (Par_I)
7972 Insert_After (Freeze_Node (Par_I), F_Node);
7979 -- When the instantiation occurs in a package declaration, append the
7980 -- freeze node to the private declarations (if any).
7982 if Nkind (Par_N) = N_Package_Specification
7983 and then Decls = Visible_Declarations (Par_N)
7984 and then Present (Private_Declarations (Par_N))
7985 and then not Is_Empty_List (Private_Declarations (Par_N))
7987 Decls := Private_Declarations (Par_N);
7988 Decl := First (Decls);
7991 -- Determine the proper freeze point of a package instantiation. We
7992 -- adhere to the general rule of a package or subprogram body causing
7993 -- freezing of anything before it in the same declarative region. In
7994 -- this case, the proper freeze point of a package instantiation is
7995 -- before the first source body which follows, or before a stub. This
7996 -- ensures that entities coming from the instance are already frozen
7997 -- and usable in source bodies.
7999 if Nkind (Par_N) /= N_Package_Declaration
8000 and then Ekind (Inst) = E_Package
8001 and then Is_Generic_Instance (Inst)
8003 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
8005 while Present (Decl) loop
8006 if (Nkind (Decl) in N_Unit_Body
8008 Nkind (Decl) in N_Body_Stub)
8009 and then Comes_From_Source (Decl)
8011 Insert_Before (Decl, F_Node);
8019 -- In a package declaration, or if no previous body, insert at end
8022 Set_Sloc (F_Node, Sloc (Last (Decls)));
8023 Insert_After (Last (Decls), F_Node);
8025 end Insert_Freeze_Node_For_Instance;
8031 procedure Install_Body
8032 (Act_Body : Node_Id;
8037 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
8038 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
8039 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
8040 Par : constant Entity_Id := Scope (Gen_Id);
8041 Gen_Unit : constant Node_Id :=
8042 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
8043 Orig_Body : Node_Id := Gen_Body;
8045 Body_Unit : Node_Id;
8047 Must_Delay : Boolean;
8049 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
8050 -- Find subprogram (if any) that encloses instance and/or generic body
8052 function True_Sloc (N : Node_Id) return Source_Ptr;
8053 -- If the instance is nested inside a generic unit, the Sloc of the
8054 -- instance indicates the place of the original definition, not the
8055 -- point of the current enclosing instance. Pending a better usage of
8056 -- Slocs to indicate instantiation places, we determine the place of
8057 -- origin of a node by finding the maximum sloc of any ancestor node.
8058 -- Why is this not equivalent to Top_Level_Location ???
8060 --------------------
8061 -- Enclosing_Subp --
8062 --------------------
8064 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
8069 while Scop /= Standard_Standard
8070 and then not Is_Overloadable (Scop)
8072 Scop := Scope (Scop);
8082 function True_Sloc (N : Node_Id) return Source_Ptr is
8089 while Present (N1) and then N1 /= Act_Unit loop
8090 if Sloc (N1) > Res then
8100 -- Start of processing for Install_Body
8103 -- If the body is a subunit, the freeze point is the corresponding stub
8104 -- in the current compilation, not the subunit itself.
8106 if Nkind (Parent (Gen_Body)) = N_Subunit then
8107 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
8109 Orig_Body := Gen_Body;
8112 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
8114 -- If the instantiation and the generic definition appear in the same
8115 -- package declaration, this is an early instantiation. If they appear
8116 -- in the same declarative part, it is an early instantiation only if
8117 -- the generic body appears textually later, and the generic body is
8118 -- also in the main unit.
8120 -- If instance is nested within a subprogram, and the generic body is
8121 -- not, the instance is delayed because the enclosing body is. If
8122 -- instance and body are within the same scope, or the same sub-
8123 -- program body, indicate explicitly that the instance is delayed.
8126 (Gen_Unit = Act_Unit
8127 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
8128 N_Generic_Package_Declaration)
8129 or else (Gen_Unit = Body_Unit
8130 and then True_Sloc (N) < Sloc (Orig_Body)))
8131 and then Is_In_Main_Unit (Gen_Unit)
8132 and then (Scope (Act_Id) = Scope (Gen_Id)
8134 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
8136 -- If this is an early instantiation, the freeze node is placed after
8137 -- the generic body. Otherwise, if the generic appears in an instance,
8138 -- we cannot freeze the current instance until the outer one is frozen.
8139 -- This is only relevant if the current instance is nested within some
8140 -- inner scope not itself within the outer instance. If this scope is
8141 -- a package body in the same declarative part as the outer instance,
8142 -- then that body needs to be frozen after the outer instance. Finally,
8143 -- if no delay is needed, we place the freeze node at the end of the
8144 -- current declarative part.
8146 if Expander_Active then
8147 Ensure_Freeze_Node (Act_Id);
8148 F_Node := Freeze_Node (Act_Id);
8151 Insert_After (Orig_Body, F_Node);
8153 elsif Is_Generic_Instance (Par)
8154 and then Present (Freeze_Node (Par))
8155 and then Scope (Act_Id) /= Par
8157 -- Freeze instance of inner generic after instance of enclosing
8160 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
8162 -- Handle the following case:
8164 -- package Parent_Inst is new ...
8167 -- procedure P ... -- this body freezes Parent_Inst
8169 -- package Inst is new ...
8171 -- In this particular scenario, the freeze node for Inst must
8172 -- be inserted in the same manner as that of Parent_Inst -
8173 -- before the next source body or at the end of the declarative
8174 -- list (body not available). If body P did not exist and
8175 -- Parent_Inst was frozen after Inst, either by a body
8176 -- following Inst or at the end of the declarative region, the
8177 -- freeze node for Inst must be inserted after that of
8178 -- Parent_Inst. This relation is established by comparing the
8179 -- Slocs of Parent_Inst freeze node and Inst.
8181 if List_Containing (Get_Package_Instantiation_Node (Par)) =
8183 and then Sloc (Freeze_Node (Par)) < Sloc (N)
8185 Insert_Freeze_Node_For_Instance (N, F_Node);
8187 Insert_After (Freeze_Node (Par), F_Node);
8190 -- Freeze package enclosing instance of inner generic after
8191 -- instance of enclosing generic.
8193 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body)
8194 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
8197 Enclosing : Entity_Id;
8200 Enclosing := Corresponding_Spec (Parent (N));
8202 if No (Enclosing) then
8203 Enclosing := Defining_Entity (Parent (N));
8206 Insert_Freeze_Node_For_Instance (N, F_Node);
8207 Ensure_Freeze_Node (Enclosing);
8209 if not Is_List_Member (Freeze_Node (Enclosing)) then
8211 -- The enclosing context is a subunit, insert the freeze
8212 -- node after the stub.
8214 if Nkind (Parent (Parent (N))) = N_Subunit then
8215 Insert_Freeze_Node_For_Instance
8216 (Corresponding_Stub (Parent (Parent (N))),
8217 Freeze_Node (Enclosing));
8219 -- The enclosing context is a package with a stub body
8220 -- which has already been replaced by the real body.
8221 -- Insert the freeze node after the actual body.
8223 elsif Ekind (Enclosing) = E_Package
8224 and then Present (Body_Entity (Enclosing))
8225 and then Was_Originally_Stub
8226 (Parent (Body_Entity (Enclosing)))
8228 Insert_Freeze_Node_For_Instance
8229 (Parent (Body_Entity (Enclosing)),
8230 Freeze_Node (Enclosing));
8232 -- The parent instance has been frozen before the body of
8233 -- the enclosing package, insert the freeze node after
8236 elsif List_Containing (Freeze_Node (Par)) =
8237 List_Containing (Parent (N))
8238 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
8240 Insert_Freeze_Node_For_Instance
8241 (Parent (N), Freeze_Node (Enclosing));
8245 (Freeze_Node (Par), Freeze_Node (Enclosing));
8251 Insert_Freeze_Node_For_Instance (N, F_Node);
8255 Insert_Freeze_Node_For_Instance (N, F_Node);
8259 Set_Is_Frozen (Act_Id);
8260 Insert_Before (N, Act_Body);
8261 Mark_Rewrite_Insertion (Act_Body);
8264 -----------------------------
8265 -- Install_Formal_Packages --
8266 -----------------------------
8268 procedure Install_Formal_Packages (Par : Entity_Id) is
8271 Gen_E : Entity_Id := Empty;
8274 E := First_Entity (Par);
8276 -- If we are installing an instance parent, locate the formal packages
8277 -- of its generic parent.
8279 if Is_Generic_Instance (Par) then
8280 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
8281 Gen_E := First_Entity (Gen);
8284 while Present (E) loop
8285 if Ekind (E) = E_Package
8286 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
8288 -- If this is the renaming for the parent instance, done
8290 if Renamed_Object (E) = Par then
8293 -- The visibility of a formal of an enclosing generic is already
8296 elsif Denotes_Formal_Package (E) then
8299 elsif Present (Associated_Formal_Package (E)) then
8300 Check_Generic_Actuals (Renamed_Object (E), True);
8301 Set_Is_Hidden (E, False);
8303 -- Find formal package in generic unit that corresponds to
8304 -- (instance of) formal package in instance.
8306 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
8307 Next_Entity (Gen_E);
8310 if Present (Gen_E) then
8311 Map_Formal_Package_Entities (Gen_E, E);
8317 if Present (Gen_E) then
8318 Next_Entity (Gen_E);
8321 end Install_Formal_Packages;
8323 --------------------
8324 -- Install_Parent --
8325 --------------------
8327 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
8328 Ancestors : constant Elist_Id := New_Elmt_List;
8329 S : constant Entity_Id := Current_Scope;
8330 Inst_Par : Entity_Id;
8331 First_Par : Entity_Id;
8332 Inst_Node : Node_Id;
8333 Gen_Par : Entity_Id;
8334 First_Gen : Entity_Id;
8337 procedure Install_Noninstance_Specs (Par : Entity_Id);
8338 -- Install the scopes of noninstance parent units ending with Par
8340 procedure Install_Spec (Par : Entity_Id);
8341 -- The child unit is within the declarative part of the parent, so
8342 -- the declarations within the parent are immediately visible.
8344 -------------------------------
8345 -- Install_Noninstance_Specs --
8346 -------------------------------
8348 procedure Install_Noninstance_Specs (Par : Entity_Id) is
8351 and then Par /= Standard_Standard
8352 and then not In_Open_Scopes (Par)
8354 Install_Noninstance_Specs (Scope (Par));
8357 end Install_Noninstance_Specs;
8363 procedure Install_Spec (Par : Entity_Id) is
8364 Spec : constant Node_Id :=
8365 Specification (Unit_Declaration_Node (Par));
8368 -- If this parent of the child instance is a top-level unit,
8369 -- then record the unit and its visibility for later resetting
8370 -- in Remove_Parent. We exclude units that are generic instances,
8371 -- as we only want to record this information for the ultimate
8372 -- top-level noninstance parent (is that always correct???).
8374 if Scope (Par) = Standard_Standard
8375 and then not Is_Generic_Instance (Par)
8377 Parent_Unit_Visible := Is_Immediately_Visible (Par);
8378 Instance_Parent_Unit := Par;
8381 -- Open the parent scope and make it and its declarations visible.
8382 -- If this point is not within a body, then only the visible
8383 -- declarations should be made visible, and installation of the
8384 -- private declarations is deferred until the appropriate point
8385 -- within analysis of the spec being instantiated (see the handling
8386 -- of parent visibility in Analyze_Package_Specification). This is
8387 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8388 -- private view problems that occur when compiling instantiations of
8389 -- a generic child of that package (Generic_Dispatching_Constructor).
8390 -- If the instance freezes a tagged type, inlinings of operations
8391 -- from Ada.Tags may need the full view of type Tag. If inlining took
8392 -- proper account of establishing visibility of inlined subprograms'
8393 -- parents then it should be possible to remove this
8394 -- special check. ???
8397 Set_Is_Immediately_Visible (Par);
8398 Install_Visible_Declarations (Par);
8399 Set_Use (Visible_Declarations (Spec));
8401 if In_Body or else Is_RTU (Par, Ada_Tags) then
8402 Install_Private_Declarations (Par);
8403 Set_Use (Private_Declarations (Spec));
8407 -- Start of processing for Install_Parent
8410 -- We need to install the parent instance to compile the instantiation
8411 -- of the child, but the child instance must appear in the current
8412 -- scope. Given that we cannot place the parent above the current scope
8413 -- in the scope stack, we duplicate the current scope and unstack both
8414 -- after the instantiation is complete.
8416 -- If the parent is itself the instantiation of a child unit, we must
8417 -- also stack the instantiation of its parent, and so on. Each such
8418 -- ancestor is the prefix of the name in a prior instantiation.
8420 -- If this is a nested instance, the parent unit itself resolves to
8421 -- a renaming of the parent instance, whose declaration we need.
8423 -- Finally, the parent may be a generic (not an instance) when the
8424 -- child unit appears as a formal package.
8428 if Present (Renamed_Entity (Inst_Par)) then
8429 Inst_Par := Renamed_Entity (Inst_Par);
8432 First_Par := Inst_Par;
8435 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
8437 First_Gen := Gen_Par;
8439 while Present (Gen_Par)
8440 and then Is_Child_Unit (Gen_Par)
8442 -- Load grandparent instance as well
8444 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
8446 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
8447 Inst_Par := Entity (Prefix (Name (Inst_Node)));
8449 if Present (Renamed_Entity (Inst_Par)) then
8450 Inst_Par := Renamed_Entity (Inst_Par);
8455 (Specification (Unit_Declaration_Node (Inst_Par)));
8457 if Present (Gen_Par) then
8458 Prepend_Elmt (Inst_Par, Ancestors);
8461 -- Parent is not the name of an instantiation
8463 Install_Noninstance_Specs (Inst_Par);
8474 if Present (First_Gen) then
8475 Append_Elmt (First_Par, Ancestors);
8477 Install_Noninstance_Specs (First_Par);
8480 if not Is_Empty_Elmt_List (Ancestors) then
8481 Elmt := First_Elmt (Ancestors);
8482 while Present (Elmt) loop
8483 Install_Spec (Node (Elmt));
8484 Install_Formal_Packages (Node (Elmt));
8494 -------------------------------
8495 -- Install_Hidden_Primitives --
8496 -------------------------------
8498 procedure Install_Hidden_Primitives
8499 (Prims_List : in out Elist_Id;
8504 List : Elist_Id := No_Elist;
8505 Prim_G_Elmt : Elmt_Id;
8506 Prim_A_Elmt : Elmt_Id;
8511 -- No action needed in case of serious errors because we cannot trust
8512 -- in the order of primitives
8514 if Serious_Errors_Detected > 0 then
8517 -- No action possible if we don't have available the list of primitive
8521 or else not Is_Record_Type (Gen_T)
8522 or else not Is_Tagged_Type (Gen_T)
8523 or else not Is_Record_Type (Act_T)
8524 or else not Is_Tagged_Type (Act_T)
8528 -- There is no need to handle interface types since their primitives
8531 elsif Is_Interface (Gen_T) then
8535 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T));
8537 if not Is_Class_Wide_Type (Act_T) then
8538 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T));
8540 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T)));
8544 -- Skip predefined primitives in the generic formal
8546 while Present (Prim_G_Elmt)
8547 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt))
8549 Next_Elmt (Prim_G_Elmt);
8552 -- Skip predefined primitives in the generic actual
8554 while Present (Prim_A_Elmt)
8555 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt))
8557 Next_Elmt (Prim_A_Elmt);
8560 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt);
8562 Prim_G := Node (Prim_G_Elmt);
8563 Prim_A := Node (Prim_A_Elmt);
8565 -- There is no need to handle interface primitives because their
8566 -- primitives are not hidden
8568 exit when Present (Interface_Alias (Prim_G));
8570 -- Here we install one hidden primitive
8572 if Chars (Prim_G) /= Chars (Prim_A)
8573 and then Has_Suffix (Prim_A, 'P')
8574 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G)
8576 Set_Chars (Prim_A, Chars (Prim_G));
8578 if List = No_Elist then
8579 List := New_Elmt_List;
8582 Append_Elmt (Prim_A, List);
8585 Next_Elmt (Prim_A_Elmt);
8586 Next_Elmt (Prim_G_Elmt);
8589 -- Append the elements to the list of temporarily visible primitives
8590 -- avoiding duplicates.
8592 if Present (List) then
8593 if No (Prims_List) then
8594 Prims_List := New_Elmt_List;
8597 Elmt := First_Elmt (List);
8598 while Present (Elmt) loop
8599 Append_Unique_Elmt (Node (Elmt), Prims_List);
8603 end Install_Hidden_Primitives;
8605 -------------------------------
8606 -- Restore_Hidden_Primitives --
8607 -------------------------------
8609 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is
8610 Prim_Elmt : Elmt_Id;
8614 if Prims_List /= No_Elist then
8615 Prim_Elmt := First_Elmt (Prims_List);
8616 while Present (Prim_Elmt) loop
8617 Prim := Node (Prim_Elmt);
8618 Set_Chars (Prim, Add_Suffix (Prim, 'P'));
8619 Next_Elmt (Prim_Elmt);
8622 Prims_List := No_Elist;
8624 end Restore_Hidden_Primitives;
8626 --------------------------------
8627 -- Instantiate_Formal_Package --
8628 --------------------------------
8630 function Instantiate_Formal_Package
8633 Analyzed_Formal : Node_Id) return List_Id
8635 Loc : constant Source_Ptr := Sloc (Actual);
8636 Actual_Pack : Entity_Id;
8637 Formal_Pack : Entity_Id;
8638 Gen_Parent : Entity_Id;
8641 Parent_Spec : Node_Id;
8643 procedure Find_Matching_Actual
8645 Act : in out Entity_Id);
8646 -- We need to associate each formal entity in the formal package
8647 -- with the corresponding entity in the actual package. The actual
8648 -- package has been analyzed and possibly expanded, and as a result
8649 -- there is no one-to-one correspondence between the two lists (for
8650 -- example, the actual may include subtypes, itypes, and inherited
8651 -- primitive operations, interspersed among the renaming declarations
8652 -- for the actuals) . We retrieve the corresponding actual by name
8653 -- because each actual has the same name as the formal, and they do
8654 -- appear in the same order.
8656 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
8657 -- Retrieve entity of defining entity of generic formal parameter.
8658 -- Only the declarations of formals need to be considered when
8659 -- linking them to actuals, but the declarative list may include
8660 -- internal entities generated during analysis, and those are ignored.
8662 procedure Match_Formal_Entity
8663 (Formal_Node : Node_Id;
8664 Formal_Ent : Entity_Id;
8665 Actual_Ent : Entity_Id);
8666 -- Associates the formal entity with the actual. In the case
8667 -- where Formal_Ent is a formal package, this procedure iterates
8668 -- through all of its formals and enters associations between the
8669 -- actuals occurring in the formal package's corresponding actual
8670 -- package (given by Actual_Ent) and the formal package's formal
8671 -- parameters. This procedure recurses if any of the parameters is
8672 -- itself a package.
8674 function Is_Instance_Of
8675 (Act_Spec : Entity_Id;
8676 Gen_Anc : Entity_Id) return Boolean;
8677 -- The actual can be an instantiation of a generic within another
8678 -- instance, in which case there is no direct link from it to the
8679 -- original generic ancestor. In that case, we recognize that the
8680 -- ultimate ancestor is the same by examining names and scopes.
8682 procedure Process_Nested_Formal (Formal : Entity_Id);
8683 -- If the current formal is declared with a box, its own formals are
8684 -- visible in the instance, as they were in the generic, and their
8685 -- Hidden flag must be reset. If some of these formals are themselves
8686 -- packages declared with a box, the processing must be recursive.
8688 --------------------------
8689 -- Find_Matching_Actual --
8690 --------------------------
8692 procedure Find_Matching_Actual
8694 Act : in out Entity_Id)
8696 Formal_Ent : Entity_Id;
8699 case Nkind (Original_Node (F)) is
8700 when N_Formal_Object_Declaration |
8701 N_Formal_Type_Declaration =>
8702 Formal_Ent := Defining_Identifier (F);
8704 while Chars (Act) /= Chars (Formal_Ent) loop
8708 when N_Formal_Subprogram_Declaration |
8709 N_Formal_Package_Declaration |
8710 N_Package_Declaration |
8711 N_Generic_Package_Declaration =>
8712 Formal_Ent := Defining_Entity (F);
8714 while Chars (Act) /= Chars (Formal_Ent) loop
8719 raise Program_Error;
8721 end Find_Matching_Actual;
8723 -------------------------
8724 -- Match_Formal_Entity --
8725 -------------------------
8727 procedure Match_Formal_Entity
8728 (Formal_Node : Node_Id;
8729 Formal_Ent : Entity_Id;
8730 Actual_Ent : Entity_Id)
8732 Act_Pkg : Entity_Id;
8735 Set_Instance_Of (Formal_Ent, Actual_Ent);
8737 if Ekind (Actual_Ent) = E_Package then
8739 -- Record associations for each parameter
8741 Act_Pkg := Actual_Ent;
8744 A_Ent : Entity_Id := First_Entity (Act_Pkg);
8753 -- Retrieve the actual given in the formal package declaration
8755 Actual := Entity (Name (Original_Node (Formal_Node)));
8757 -- The actual in the formal package declaration may be a
8758 -- renamed generic package, in which case we want to retrieve
8759 -- the original generic in order to traverse its formal part.
8761 if Present (Renamed_Entity (Actual)) then
8762 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8764 Gen_Decl := Unit_Declaration_Node (Actual);
8767 Formals := Generic_Formal_Declarations (Gen_Decl);
8769 if Present (Formals) then
8770 F_Node := First_Non_Pragma (Formals);
8775 while Present (A_Ent)
8776 and then Present (F_Node)
8777 and then A_Ent /= First_Private_Entity (Act_Pkg)
8779 F_Ent := Get_Formal_Entity (F_Node);
8781 if Present (F_Ent) then
8783 -- This is a formal of the original package. Record
8784 -- association and recurse.
8786 Find_Matching_Actual (F_Node, A_Ent);
8787 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8788 Next_Entity (A_Ent);
8791 Next_Non_Pragma (F_Node);
8795 end Match_Formal_Entity;
8797 -----------------------
8798 -- Get_Formal_Entity --
8799 -----------------------
8801 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8802 Kind : constant Node_Kind := Nkind (Original_Node (N));
8805 when N_Formal_Object_Declaration =>
8806 return Defining_Identifier (N);
8808 when N_Formal_Type_Declaration =>
8809 return Defining_Identifier (N);
8811 when N_Formal_Subprogram_Declaration =>
8812 return Defining_Unit_Name (Specification (N));
8814 when N_Formal_Package_Declaration =>
8815 return Defining_Identifier (Original_Node (N));
8817 when N_Generic_Package_Declaration =>
8818 return Defining_Identifier (Original_Node (N));
8820 -- All other declarations are introduced by semantic analysis and
8821 -- have no match in the actual.
8826 end Get_Formal_Entity;
8828 --------------------
8829 -- Is_Instance_Of --
8830 --------------------
8832 function Is_Instance_Of
8833 (Act_Spec : Entity_Id;
8834 Gen_Anc : Entity_Id) return Boolean
8836 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8839 if No (Gen_Par) then
8842 -- Simplest case: the generic parent of the actual is the formal
8844 elsif Gen_Par = Gen_Anc then
8847 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
8850 -- The actual may be obtained through several instantiations. Its
8851 -- scope must itself be an instance of a generic declared in the
8852 -- same scope as the formal. Any other case is detected above.
8854 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
8858 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
8862 ---------------------------
8863 -- Process_Nested_Formal --
8864 ---------------------------
8866 procedure Process_Nested_Formal (Formal : Entity_Id) is
8870 if Present (Associated_Formal_Package (Formal))
8871 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8873 Ent := First_Entity (Formal);
8874 while Present (Ent) loop
8875 Set_Is_Hidden (Ent, False);
8876 Set_Is_Visible_Formal (Ent);
8877 Set_Is_Potentially_Use_Visible
8878 (Ent, Is_Potentially_Use_Visible (Formal));
8880 if Ekind (Ent) = E_Package then
8881 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
8882 Process_Nested_Formal (Ent);
8888 end Process_Nested_Formal;
8890 -- Start of processing for Instantiate_Formal_Package
8895 if not Is_Entity_Name (Actual)
8896 or else Ekind (Entity (Actual)) /= E_Package
8899 ("expect package instance to instantiate formal", Actual);
8900 Abandon_Instantiation (Actual);
8901 raise Program_Error;
8904 Actual_Pack := Entity (Actual);
8905 Set_Is_Instantiated (Actual_Pack);
8907 -- The actual may be a renamed package, or an outer generic formal
8908 -- package whose instantiation is converted into a renaming.
8910 if Present (Renamed_Object (Actual_Pack)) then
8911 Actual_Pack := Renamed_Object (Actual_Pack);
8914 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
8915 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
8916 Formal_Pack := Defining_Identifier (Analyzed_Formal);
8919 Generic_Parent (Specification (Analyzed_Formal));
8921 Defining_Unit_Name (Specification (Analyzed_Formal));
8924 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
8925 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
8927 Parent_Spec := Parent (Actual_Pack);
8930 if Gen_Parent = Any_Id then
8932 ("previous error in declaration of formal package", Actual);
8933 Abandon_Instantiation (Actual);
8936 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
8942 ("actual parameter must be instance of&", Actual, Gen_Parent);
8943 Abandon_Instantiation (Actual);
8946 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
8947 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
8950 Make_Package_Renaming_Declaration (Loc,
8951 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
8952 Name => New_Reference_To (Actual_Pack, Loc));
8954 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
8955 Defining_Identifier (Formal));
8956 Decls := New_List (Nod);
8958 -- If the formal F has a box, then the generic declarations are
8959 -- visible in the generic G. In an instance of G, the corresponding
8960 -- entities in the actual for F (which are the actuals for the
8961 -- instantiation of the generic that F denotes) must also be made
8962 -- visible for analysis of the current instance. On exit from the
8963 -- current instance, those entities are made private again. If the
8964 -- actual is currently in use, these entities are also use-visible.
8966 -- The loop through the actual entities also steps through the formal
8967 -- entities and enters associations from formals to actuals into the
8968 -- renaming map. This is necessary to properly handle checking of
8969 -- actual parameter associations for later formals that depend on
8970 -- actuals declared in the formal package.
8972 -- In Ada 2005, partial parametrization requires that we make visible
8973 -- the actuals corresponding to formals that were defaulted in the
8974 -- formal package. There formals are identified because they remain
8975 -- formal generics within the formal package, rather than being
8976 -- renamings of the actuals supplied.
8979 Gen_Decl : constant Node_Id :=
8980 Unit_Declaration_Node (Gen_Parent);
8981 Formals : constant List_Id :=
8982 Generic_Formal_Declarations (Gen_Decl);
8984 Actual_Ent : Entity_Id;
8985 Actual_Of_Formal : Node_Id;
8986 Formal_Node : Node_Id;
8987 Formal_Ent : Entity_Id;
8990 if Present (Formals) then
8991 Formal_Node := First_Non_Pragma (Formals);
8993 Formal_Node := Empty;
8996 Actual_Ent := First_Entity (Actual_Pack);
8998 First (Visible_Declarations (Specification (Analyzed_Formal)));
8999 while Present (Actual_Ent)
9000 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9002 if Present (Formal_Node) then
9003 Formal_Ent := Get_Formal_Entity (Formal_Node);
9005 if Present (Formal_Ent) then
9006 Find_Matching_Actual (Formal_Node, Actual_Ent);
9008 (Formal_Node, Formal_Ent, Actual_Ent);
9010 -- We iterate at the same time over the actuals of the
9011 -- local package created for the formal, to determine
9012 -- which one of the formals of the original generic were
9013 -- defaulted in the formal. The corresponding actual
9014 -- entities are visible in the enclosing instance.
9016 if Box_Present (Formal)
9018 (Present (Actual_Of_Formal)
9021 (Get_Formal_Entity (Actual_Of_Formal)))
9023 Set_Is_Hidden (Actual_Ent, False);
9024 Set_Is_Visible_Formal (Actual_Ent);
9025 Set_Is_Potentially_Use_Visible
9026 (Actual_Ent, In_Use (Actual_Pack));
9028 if Ekind (Actual_Ent) = E_Package then
9029 Process_Nested_Formal (Actual_Ent);
9033 Set_Is_Hidden (Actual_Ent);
9034 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
9038 Next_Non_Pragma (Formal_Node);
9039 Next (Actual_Of_Formal);
9042 -- No further formals to match, but the generic part may
9043 -- contain inherited operation that are not hidden in the
9044 -- enclosing instance.
9046 Next_Entity (Actual_Ent);
9050 -- Inherited subprograms generated by formal derived types are
9051 -- also visible if the types are.
9053 Actual_Ent := First_Entity (Actual_Pack);
9054 while Present (Actual_Ent)
9055 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9057 if Is_Overloadable (Actual_Ent)
9059 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
9061 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
9063 Set_Is_Hidden (Actual_Ent, False);
9064 Set_Is_Potentially_Use_Visible
9065 (Actual_Ent, In_Use (Actual_Pack));
9068 Next_Entity (Actual_Ent);
9072 -- If the formal is not declared with a box, reanalyze it as an
9073 -- abbreviated instantiation, to verify the matching rules of 12.7.
9074 -- The actual checks are performed after the generic associations
9075 -- have been analyzed, to guarantee the same visibility for this
9076 -- instantiation and for the actuals.
9078 -- In Ada 2005, the generic associations for the formal can include
9079 -- defaulted parameters. These are ignored during check. This
9080 -- internal instantiation is removed from the tree after conformance
9081 -- checking, because it contains formal declarations for those
9082 -- defaulted parameters, and those should not reach the back-end.
9084 if not Box_Present (Formal) then
9086 I_Pack : constant Entity_Id :=
9087 Make_Temporary (Sloc (Actual), 'P');
9090 Set_Is_Internal (I_Pack);
9093 Make_Package_Instantiation (Sloc (Actual),
9094 Defining_Unit_Name => I_Pack,
9097 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
9098 Generic_Associations =>
9099 Generic_Associations (Formal)));
9105 end Instantiate_Formal_Package;
9107 -----------------------------------
9108 -- Instantiate_Formal_Subprogram --
9109 -----------------------------------
9111 function Instantiate_Formal_Subprogram
9114 Analyzed_Formal : Node_Id) return Node_Id
9117 Formal_Sub : constant Entity_Id :=
9118 Defining_Unit_Name (Specification (Formal));
9119 Analyzed_S : constant Entity_Id :=
9120 Defining_Unit_Name (Specification (Analyzed_Formal));
9121 Decl_Node : Node_Id;
9125 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
9126 -- If the generic is a child unit, the parent has been installed on the
9127 -- scope stack, but a default subprogram cannot resolve to something on
9128 -- the parent because that parent is not really part of the visible
9129 -- context (it is there to resolve explicit local entities). If the
9130 -- default has resolved in this way, we remove the entity from
9131 -- immediate visibility and analyze the node again to emit an error
9132 -- message or find another visible candidate.
9134 procedure Valid_Actual_Subprogram (Act : Node_Id);
9135 -- Perform legality check and raise exception on failure
9137 -----------------------
9138 -- From_Parent_Scope --
9139 -----------------------
9141 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
9142 Gen_Scope : Node_Id;
9145 Gen_Scope := Scope (Analyzed_S);
9146 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop
9147 if Scope (Subp) = Scope (Gen_Scope) then
9151 Gen_Scope := Scope (Gen_Scope);
9155 end From_Parent_Scope;
9157 -----------------------------
9158 -- Valid_Actual_Subprogram --
9159 -----------------------------
9161 procedure Valid_Actual_Subprogram (Act : Node_Id) is
9165 if Is_Entity_Name (Act) then
9166 Act_E := Entity (Act);
9168 elsif Nkind (Act) = N_Selected_Component
9169 and then Is_Entity_Name (Selector_Name (Act))
9171 Act_E := Entity (Selector_Name (Act));
9177 if (Present (Act_E) and then Is_Overloadable (Act_E))
9178 or else Nkind_In (Act, N_Attribute_Reference,
9179 N_Indexed_Component,
9180 N_Character_Literal,
9181 N_Explicit_Dereference)
9187 ("expect subprogram or entry name in instantiation of&",
9188 Instantiation_Node, Formal_Sub);
9189 Abandon_Instantiation (Instantiation_Node);
9191 end Valid_Actual_Subprogram;
9193 -- Start of processing for Instantiate_Formal_Subprogram
9196 New_Spec := New_Copy_Tree (Specification (Formal));
9198 -- The tree copy has created the proper instantiation sloc for the
9199 -- new specification. Use this location for all other constructed
9202 Loc := Sloc (Defining_Unit_Name (New_Spec));
9204 -- Create new entity for the actual (New_Copy_Tree does not)
9206 Set_Defining_Unit_Name
9207 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9209 -- Create new entities for the each of the formals in the
9210 -- specification of the renaming declaration built for the actual.
9212 if Present (Parameter_Specifications (New_Spec)) then
9216 F := First (Parameter_Specifications (New_Spec));
9217 while Present (F) loop
9218 Set_Defining_Identifier (F,
9219 Make_Defining_Identifier (Sloc (F),
9220 Chars => Chars (Defining_Identifier (F))));
9226 -- Find entity of actual. If the actual is an attribute reference, it
9227 -- cannot be resolved here (its formal is missing) but is handled
9228 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9229 -- fully resolved subsequently, when the renaming declaration for the
9230 -- formal is analyzed. If it is an explicit dereference, resolve the
9231 -- prefix but not the actual itself, to prevent interpretation as call.
9233 if Present (Actual) then
9234 Loc := Sloc (Actual);
9235 Set_Sloc (New_Spec, Loc);
9237 if Nkind (Actual) = N_Operator_Symbol then
9238 Find_Direct_Name (Actual);
9240 elsif Nkind (Actual) = N_Explicit_Dereference then
9241 Analyze (Prefix (Actual));
9243 elsif Nkind (Actual) /= N_Attribute_Reference then
9247 Valid_Actual_Subprogram (Actual);
9250 elsif Present (Default_Name (Formal)) then
9251 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
9252 N_Selected_Component,
9253 N_Indexed_Component,
9254 N_Character_Literal)
9255 and then Present (Entity (Default_Name (Formal)))
9257 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
9259 Nam := New_Copy (Default_Name (Formal));
9260 Set_Sloc (Nam, Loc);
9263 elsif Box_Present (Formal) then
9265 -- Actual is resolved at the point of instantiation. Create an
9266 -- identifier or operator with the same name as the formal.
9268 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
9269 Nam := Make_Operator_Symbol (Loc,
9270 Chars => Chars (Formal_Sub),
9271 Strval => No_String);
9273 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
9276 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
9277 and then Null_Present (Specification (Formal))
9279 -- Generate null body for procedure, for use in the instance
9282 Make_Subprogram_Body (Loc,
9283 Specification => New_Spec,
9284 Declarations => New_List,
9285 Handled_Statement_Sequence =>
9286 Make_Handled_Sequence_Of_Statements (Loc,
9287 Statements => New_List (Make_Null_Statement (Loc))));
9289 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
9293 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
9295 ("missing actual&", Instantiation_Node, Formal_Sub);
9297 ("\in instantiation of & declared#",
9298 Instantiation_Node, Scope (Analyzed_S));
9299 Abandon_Instantiation (Instantiation_Node);
9303 Make_Subprogram_Renaming_Declaration (Loc,
9304 Specification => New_Spec,
9307 -- If we do not have an actual and the formal specified <> then set to
9308 -- get proper default.
9310 if No (Actual) and then Box_Present (Formal) then
9311 Set_From_Default (Decl_Node);
9314 -- Gather possible interpretations for the actual before analyzing the
9315 -- instance. If overloaded, it will be resolved when analyzing the
9316 -- renaming declaration.
9318 if Box_Present (Formal)
9319 and then No (Actual)
9323 if Is_Child_Unit (Scope (Analyzed_S))
9324 and then Present (Entity (Nam))
9326 if not Is_Overloaded (Nam) then
9327 if From_Parent_Scope (Entity (Nam)) then
9328 Set_Is_Immediately_Visible (Entity (Nam), False);
9329 Set_Entity (Nam, Empty);
9330 Set_Etype (Nam, Empty);
9333 Set_Is_Immediately_Visible (Entity (Nam));
9342 Get_First_Interp (Nam, I, It);
9343 while Present (It.Nam) loop
9344 if From_Parent_Scope (It.Nam) then
9348 Get_Next_Interp (I, It);
9355 -- The generic instantiation freezes the actual. This can only be done
9356 -- once the actual is resolved, in the analysis of the renaming
9357 -- declaration. To make the formal subprogram entity available, we set
9358 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9359 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9360 -- of formal abstract subprograms.
9362 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
9364 -- We cannot analyze the renaming declaration, and thus find the actual,
9365 -- until all the actuals are assembled in the instance. For subsequent
9366 -- checks of other actuals, indicate the node that will hold the
9367 -- instance of this formal.
9369 Set_Instance_Of (Analyzed_S, Nam);
9371 if Nkind (Actual) = N_Selected_Component
9372 and then Is_Task_Type (Etype (Prefix (Actual)))
9373 and then not Is_Frozen (Etype (Prefix (Actual)))
9375 -- The renaming declaration will create a body, which must appear
9376 -- outside of the instantiation, We move the renaming declaration
9377 -- out of the instance, and create an additional renaming inside,
9378 -- to prevent freezing anomalies.
9381 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
9384 Set_Defining_Unit_Name (New_Spec, Anon_Id);
9385 Insert_Before (Instantiation_Node, Decl_Node);
9386 Analyze (Decl_Node);
9388 -- Now create renaming within the instance
9391 Make_Subprogram_Renaming_Declaration (Loc,
9392 Specification => New_Copy_Tree (New_Spec),
9393 Name => New_Occurrence_Of (Anon_Id, Loc));
9395 Set_Defining_Unit_Name (Specification (Decl_Node),
9396 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9401 end Instantiate_Formal_Subprogram;
9403 ------------------------
9404 -- Instantiate_Object --
9405 ------------------------
9407 function Instantiate_Object
9410 Analyzed_Formal : Node_Id) return List_Id
9412 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
9413 A_Gen_Obj : constant Entity_Id :=
9414 Defining_Identifier (Analyzed_Formal);
9415 Acc_Def : Node_Id := Empty;
9416 Act_Assoc : constant Node_Id := Parent (Actual);
9417 Actual_Decl : Node_Id := Empty;
9418 Decl_Node : Node_Id;
9421 List : constant List_Id := New_List;
9422 Loc : constant Source_Ptr := Sloc (Actual);
9423 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
9424 Subt_Decl : Node_Id := Empty;
9425 Subt_Mark : Node_Id := Empty;
9428 if Present (Subtype_Mark (Formal)) then
9429 Subt_Mark := Subtype_Mark (Formal);
9431 Check_Access_Definition (Formal);
9432 Acc_Def := Access_Definition (Formal);
9435 -- Sloc for error message on missing actual
9437 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
9439 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
9440 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
9443 Set_Parent (List, Parent (Actual));
9447 if Out_Present (Formal) then
9449 -- An IN OUT generic actual must be a name. The instantiation is a
9450 -- renaming declaration. The actual is the name being renamed. We
9451 -- use the actual directly, rather than a copy, because it is not
9452 -- used further in the list of actuals, and because a copy or a use
9453 -- of relocate_node is incorrect if the instance is nested within a
9454 -- generic. In order to simplify ASIS searches, the Generic_Parent
9455 -- field links the declaration to the generic association.
9460 Instantiation_Node, Gen_Obj);
9462 ("\in instantiation of & declared#",
9463 Instantiation_Node, Scope (A_Gen_Obj));
9464 Abandon_Instantiation (Instantiation_Node);
9467 if Present (Subt_Mark) then
9469 Make_Object_Renaming_Declaration (Loc,
9470 Defining_Identifier => New_Copy (Gen_Obj),
9471 Subtype_Mark => New_Copy_Tree (Subt_Mark),
9474 else pragma Assert (Present (Acc_Def));
9476 Make_Object_Renaming_Declaration (Loc,
9477 Defining_Identifier => New_Copy (Gen_Obj),
9478 Access_Definition => New_Copy_Tree (Acc_Def),
9482 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9484 -- The analysis of the actual may produce Insert_Action nodes, so
9485 -- the declaration must have a context in which to attach them.
9487 Append (Decl_Node, List);
9490 -- Return if the analysis of the actual reported some error
9492 if Etype (Actual) = Any_Type then
9496 -- This check is performed here because Analyze_Object_Renaming will
9497 -- not check it when Comes_From_Source is False. Note though that the
9498 -- check for the actual being the name of an object will be performed
9499 -- in Analyze_Object_Renaming.
9501 if Is_Object_Reference (Actual)
9502 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
9505 ("illegal discriminant-dependent component for in out parameter",
9509 -- The actual has to be resolved in order to check that it is a
9510 -- variable (due to cases such as F (1), where F returns access to an
9511 -- array, and for overloaded prefixes).
9513 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
9515 -- If the type of the formal is not itself a formal, and the
9516 -- current unit is a child unit, the formal type must be declared
9517 -- in a parent, and must be retrieved by visibility.
9520 and then Is_Generic_Unit (Scope (Ftyp))
9521 and then Is_Child_Unit (Scope (A_Gen_Obj))
9524 Temp : constant Node_Id :=
9525 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
9527 Set_Entity (Temp, Empty);
9529 Ftyp := Entity (Temp);
9533 if Is_Private_Type (Ftyp)
9534 and then not Is_Private_Type (Etype (Actual))
9535 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
9536 or else Base_Type (Etype (Actual)) = Ftyp)
9538 -- If the actual has the type of the full view of the formal, or
9539 -- else a non-private subtype of the formal, then the visibility
9540 -- of the formal type has changed. Add to the actuals a subtype
9541 -- declaration that will force the exchange of views in the body
9542 -- of the instance as well.
9545 Make_Subtype_Declaration (Loc,
9546 Defining_Identifier => Make_Temporary (Loc, 'P'),
9547 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
9549 Prepend (Subt_Decl, List);
9551 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
9552 Exchange_Declarations (Ftyp);
9555 Resolve (Actual, Ftyp);
9557 if not Denotes_Variable (Actual) then
9559 ("actual for& must be a variable", Actual, Gen_Obj);
9561 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
9563 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
9564 -- the type of the actual shall resolve to a specific anonymous
9567 if Ada_Version < Ada_2005
9569 Ekind (Base_Type (Ftyp)) /=
9570 E_Anonymous_Access_Type
9572 Ekind (Base_Type (Etype (Actual))) /=
9573 E_Anonymous_Access_Type
9575 Error_Msg_NE ("type of actual does not match type of&",
9580 Note_Possible_Modification (Actual, Sure => True);
9582 -- Check for instantiation of atomic/volatile actual for
9583 -- non-atomic/volatile formal (RM C.6 (12)).
9585 if Is_Atomic_Object (Actual)
9586 and then not Is_Atomic (Orig_Ftyp)
9589 ("cannot instantiate non-atomic formal object " &
9590 "with atomic actual", Actual);
9592 elsif Is_Volatile_Object (Actual)
9593 and then not Is_Volatile (Orig_Ftyp)
9596 ("cannot instantiate non-volatile formal object " &
9597 "with volatile actual", Actual);
9600 -- Formal in-parameter
9603 -- The instantiation of a generic formal in-parameter is constant
9604 -- declaration. The actual is the expression for that declaration.
9606 if Present (Actual) then
9607 if Present (Subt_Mark) then
9609 else pragma Assert (Present (Acc_Def));
9614 Make_Object_Declaration (Loc,
9615 Defining_Identifier => New_Copy (Gen_Obj),
9616 Constant_Present => True,
9617 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9618 Object_Definition => New_Copy_Tree (Def),
9619 Expression => Actual);
9621 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9623 -- A generic formal object of a tagged type is defined to be
9624 -- aliased so the new constant must also be treated as aliased.
9626 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
9627 Set_Aliased_Present (Decl_Node);
9630 Append (Decl_Node, List);
9632 -- No need to repeat (pre-)analysis of some expression nodes
9633 -- already handled in Preanalyze_Actuals.
9635 if Nkind (Actual) /= N_Allocator then
9638 -- Return if the analysis of the actual reported some error
9640 if Etype (Actual) = Any_Type then
9646 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
9650 Typ := Get_Instance_Of (Formal_Type);
9652 Freeze_Before (Instantiation_Node, Typ);
9654 -- If the actual is an aggregate, perform name resolution on
9655 -- its components (the analysis of an aggregate does not do it)
9656 -- to capture local names that may be hidden if the generic is
9659 if Nkind (Actual) = N_Aggregate then
9660 Preanalyze_And_Resolve (Actual, Typ);
9663 if Is_Limited_Type (Typ)
9664 and then not OK_For_Limited_Init (Typ, Actual)
9667 ("initialization not allowed for limited types", Actual);
9668 Explain_Limited_Type (Typ, Actual);
9672 elsif Present (Default_Expression (Formal)) then
9674 -- Use default to construct declaration
9676 if Present (Subt_Mark) then
9678 else pragma Assert (Present (Acc_Def));
9683 Make_Object_Declaration (Sloc (Formal),
9684 Defining_Identifier => New_Copy (Gen_Obj),
9685 Constant_Present => True,
9686 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9687 Object_Definition => New_Copy (Def),
9688 Expression => New_Copy_Tree
9689 (Default_Expression (Formal)));
9691 Append (Decl_Node, List);
9692 Set_Analyzed (Expression (Decl_Node), False);
9697 Instantiation_Node, Gen_Obj);
9698 Error_Msg_NE ("\in instantiation of & declared#",
9699 Instantiation_Node, Scope (A_Gen_Obj));
9701 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
9703 -- Create dummy constant declaration so that instance can be
9704 -- analyzed, to minimize cascaded visibility errors.
9706 if Present (Subt_Mark) then
9708 else pragma Assert (Present (Acc_Def));
9713 Make_Object_Declaration (Loc,
9714 Defining_Identifier => New_Copy (Gen_Obj),
9715 Constant_Present => True,
9716 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9717 Object_Definition => New_Copy (Def),
9719 Make_Attribute_Reference (Sloc (Gen_Obj),
9720 Attribute_Name => Name_First,
9721 Prefix => New_Copy (Def)));
9723 Append (Decl_Node, List);
9726 Abandon_Instantiation (Instantiation_Node);
9731 if Nkind (Actual) in N_Has_Entity then
9732 Actual_Decl := Parent (Entity (Actual));
9735 -- Ada 2005 (AI-423): For a formal object declaration with a null
9736 -- exclusion or an access definition that has a null exclusion: If the
9737 -- actual matching the formal object declaration denotes a generic
9738 -- formal object of another generic unit G, and the instantiation
9739 -- containing the actual occurs within the body of G or within the body
9740 -- of a generic unit declared within the declarative region of G, then
9741 -- the declaration of the formal object of G must have a null exclusion.
9742 -- Otherwise, the subtype of the actual matching the formal object
9743 -- declaration shall exclude null.
9745 if Ada_Version >= Ada_2005
9746 and then Present (Actual_Decl)
9748 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9749 N_Object_Declaration)
9750 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9751 and then not Has_Null_Exclusion (Actual_Decl)
9752 and then Has_Null_Exclusion (Analyzed_Formal)
9754 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9756 ("actual must exclude null to match generic formal#", Actual);
9760 end Instantiate_Object;
9762 ------------------------------
9763 -- Instantiate_Package_Body --
9764 ------------------------------
9766 procedure Instantiate_Package_Body
9767 (Body_Info : Pending_Body_Info;
9768 Inlined_Body : Boolean := False;
9769 Body_Optional : Boolean := False)
9771 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9772 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9773 Loc : constant Source_Ptr := Sloc (Inst_Node);
9775 Gen_Id : constant Node_Id := Name (Inst_Node);
9776 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9777 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9778 Act_Spec : constant Node_Id := Specification (Act_Decl);
9779 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9781 Act_Body_Name : Node_Id;
9783 Gen_Body_Id : Node_Id;
9785 Act_Body_Id : Entity_Id;
9787 Parent_Installed : Boolean := False;
9788 Save_Style_Check : constant Boolean := Style_Check;
9790 Par_Ent : Entity_Id := Empty;
9791 Par_Vis : Boolean := False;
9793 Vis_Prims_List : Elist_Id := No_Elist;
9794 -- List of primitives made temporarily visible in the instantiation
9795 -- to match the visibility of the formal type
9798 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9800 -- The instance body may already have been processed, as the parent of
9801 -- another instance that is inlined (Load_Parent_Of_Generic).
9803 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
9807 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9809 -- Re-establish the state of information on which checks are suppressed.
9810 -- This information was set in Body_Info at the point of instantiation,
9811 -- and now we restore it so that the instance is compiled using the
9812 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9814 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9815 Scope_Suppress := Body_Info.Scope_Suppress;
9816 Opt.Ada_Version := Body_Info.Version;
9818 if No (Gen_Body_Id) then
9819 Load_Parent_Of_Generic
9820 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9821 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9824 -- Establish global variable for sloc adjustment and for error recovery
9826 Instantiation_Node := Inst_Node;
9828 if Present (Gen_Body_Id) then
9829 Save_Env (Gen_Unit, Act_Decl_Id);
9830 Style_Check := False;
9831 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9833 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9835 Create_Instantiation_Source
9836 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
9840 (Original_Node (Gen_Body), Empty, Instantiating => True);
9842 -- Build new name (possibly qualified) for body declaration
9844 Act_Body_Id := New_Copy (Act_Decl_Id);
9846 -- Some attributes of spec entity are not inherited by body entity
9848 Set_Handler_Records (Act_Body_Id, No_List);
9850 if Nkind (Defining_Unit_Name (Act_Spec)) =
9851 N_Defining_Program_Unit_Name
9854 Make_Defining_Program_Unit_Name (Loc,
9855 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
9856 Defining_Identifier => Act_Body_Id);
9858 Act_Body_Name := Act_Body_Id;
9861 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
9863 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
9864 Check_Generic_Actuals (Act_Decl_Id, False);
9866 -- Install primitives hidden at the point of the instantiation but
9867 -- visible when processing the generic formals
9873 E := First_Entity (Act_Decl_Id);
9874 while Present (E) loop
9876 and then Is_Generic_Actual_Type (E)
9877 and then Is_Tagged_Type (E)
9879 Install_Hidden_Primitives
9880 (Prims_List => Vis_Prims_List,
9881 Gen_T => Generic_Parent_Type (Parent (E)),
9889 -- If it is a child unit, make the parent instance (which is an
9890 -- instance of the parent of the generic) visible. The parent
9891 -- instance is the prefix of the name of the generic unit.
9893 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9894 and then Nkind (Gen_Id) = N_Expanded_Name
9896 Par_Ent := Entity (Prefix (Gen_Id));
9897 Par_Vis := Is_Immediately_Visible (Par_Ent);
9898 Install_Parent (Par_Ent, In_Body => True);
9899 Parent_Installed := True;
9901 elsif Is_Child_Unit (Gen_Unit) then
9902 Par_Ent := Scope (Gen_Unit);
9903 Par_Vis := Is_Immediately_Visible (Par_Ent);
9904 Install_Parent (Par_Ent, In_Body => True);
9905 Parent_Installed := True;
9908 -- If the instantiation is a library unit, and this is the main unit,
9909 -- then build the resulting compilation unit nodes for the instance.
9910 -- If this is a compilation unit but it is not the main unit, then it
9911 -- is the body of a unit in the context, that is being compiled
9912 -- because it is encloses some inlined unit or another generic unit
9913 -- being instantiated. In that case, this body is not part of the
9914 -- current compilation, and is not attached to the tree, but its
9915 -- parent must be set for analysis.
9917 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9919 -- Replace instance node with body of instance, and create new
9920 -- node for corresponding instance declaration.
9922 Build_Instance_Compilation_Unit_Nodes
9923 (Inst_Node, Act_Body, Act_Decl);
9924 Analyze (Inst_Node);
9926 if Parent (Inst_Node) = Cunit (Main_Unit) then
9928 -- If the instance is a child unit itself, then set the scope
9929 -- of the expanded body to be the parent of the instantiation
9930 -- (ensuring that the fully qualified name will be generated
9931 -- for the elaboration subprogram).
9933 if Nkind (Defining_Unit_Name (Act_Spec)) =
9934 N_Defining_Program_Unit_Name
9937 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
9941 -- Case where instantiation is not a library unit
9944 -- If this is an early instantiation, i.e. appears textually
9945 -- before the corresponding body and must be elaborated first,
9946 -- indicate that the body instance is to be delayed.
9948 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
9950 -- Now analyze the body. We turn off all checks if this is an
9951 -- internal unit, since there is no reason to have checks on for
9952 -- any predefined run-time library code. All such code is designed
9953 -- to be compiled with checks off.
9955 -- Note that we do NOT apply this criterion to children of GNAT
9956 -- (or on VMS, children of DEC). The latter units must suppress
9957 -- checks explicitly if this is needed.
9959 if Is_Predefined_File_Name
9960 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
9962 Analyze (Act_Body, Suppress => All_Checks);
9968 Inherit_Context (Gen_Body, Inst_Node);
9970 -- Remove the parent instances if they have been placed on the scope
9971 -- stack to compile the body.
9973 if Parent_Installed then
9974 Remove_Parent (In_Body => True);
9976 -- Restore the previous visibility of the parent
9978 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9981 Restore_Hidden_Primitives (Vis_Prims_List);
9982 Restore_Private_Views (Act_Decl_Id);
9984 -- Remove the current unit from visibility if this is an instance
9985 -- that is not elaborated on the fly for inlining purposes.
9987 if not Inlined_Body then
9988 Set_Is_Immediately_Visible (Act_Decl_Id, False);
9992 Style_Check := Save_Style_Check;
9994 -- If we have no body, and the unit requires a body, then complain. This
9995 -- complaint is suppressed if we have detected other errors (since a
9996 -- common reason for missing the body is that it had errors).
9997 -- In CodePeer mode, a warning has been emitted already, no need for
9998 -- further messages.
10000 elsif Unit_Requires_Body (Gen_Unit)
10001 and then not Body_Optional
10003 if CodePeer_Mode then
10006 elsif Serious_Errors_Detected = 0 then
10008 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
10010 -- Don't attempt to perform any cleanup actions if some other error
10011 -- was already detected, since this can cause blowups.
10017 -- Case of package that does not need a body
10020 -- If the instantiation of the declaration is a library unit, rewrite
10021 -- the original package instantiation as a package declaration in the
10022 -- compilation unit node.
10024 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10025 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
10026 Rewrite (Inst_Node, Act_Decl);
10028 -- Generate elaboration entity, in case spec has elaboration code.
10029 -- This cannot be done when the instance is analyzed, because it
10030 -- is not known yet whether the body exists.
10032 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
10033 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
10035 -- If the instantiation is not a library unit, then append the
10036 -- declaration to the list of implicitly generated entities, unless
10037 -- it is already a list member which means that it was already
10040 elsif not Is_List_Member (Act_Decl) then
10041 Mark_Rewrite_Insertion (Act_Decl);
10042 Insert_Before (Inst_Node, Act_Decl);
10046 Expander_Mode_Restore;
10047 end Instantiate_Package_Body;
10049 ---------------------------------
10050 -- Instantiate_Subprogram_Body --
10051 ---------------------------------
10053 procedure Instantiate_Subprogram_Body
10054 (Body_Info : Pending_Body_Info;
10055 Body_Optional : Boolean := False)
10057 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
10058 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
10059 Loc : constant Source_Ptr := Sloc (Inst_Node);
10060 Gen_Id : constant Node_Id := Name (Inst_Node);
10061 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
10062 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
10063 Anon_Id : constant Entity_Id :=
10064 Defining_Unit_Name (Specification (Act_Decl));
10065 Pack_Id : constant Entity_Id :=
10066 Defining_Unit_Name (Parent (Act_Decl));
10068 Gen_Body : Node_Id;
10069 Gen_Body_Id : Node_Id;
10070 Act_Body : Node_Id;
10071 Pack_Body : Node_Id;
10072 Prev_Formal : Entity_Id;
10073 Ret_Expr : Node_Id;
10074 Unit_Renaming : Node_Id;
10076 Parent_Installed : Boolean := False;
10077 Save_Style_Check : constant Boolean := Style_Check;
10079 Par_Ent : Entity_Id := Empty;
10080 Par_Vis : Boolean := False;
10083 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10085 -- Subprogram body may have been created already because of an inline
10086 -- pragma, or because of multiple elaborations of the enclosing package
10087 -- when several instances of the subprogram appear in the main unit.
10089 if Present (Corresponding_Body (Act_Decl)) then
10093 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
10095 -- Re-establish the state of information on which checks are suppressed.
10096 -- This information was set in Body_Info at the point of instantiation,
10097 -- and now we restore it so that the instance is compiled using the
10098 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10100 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
10101 Scope_Suppress := Body_Info.Scope_Suppress;
10102 Opt.Ada_Version := Body_Info.Version;
10104 if No (Gen_Body_Id) then
10106 -- For imported generic subprogram, no body to compile, complete
10107 -- the spec entity appropriately.
10109 if Is_Imported (Gen_Unit) then
10110 Set_Is_Imported (Anon_Id);
10111 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
10112 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
10113 Set_Convention (Anon_Id, Convention (Gen_Unit));
10114 Set_Has_Completion (Anon_Id);
10117 -- For other cases, compile the body
10120 Load_Parent_Of_Generic
10121 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10122 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10126 Instantiation_Node := Inst_Node;
10128 if Present (Gen_Body_Id) then
10129 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10131 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
10133 -- Either body is not present, or context is non-expanding, as
10134 -- when compiling a subunit. Mark the instance as completed, and
10135 -- diagnose a missing body when needed.
10138 and then Operating_Mode = Generate_Code
10141 ("missing proper body for instantiation", Gen_Body);
10144 Set_Has_Completion (Anon_Id);
10148 Save_Env (Gen_Unit, Anon_Id);
10149 Style_Check := False;
10150 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10151 Create_Instantiation_Source
10159 (Original_Node (Gen_Body), Empty, Instantiating => True);
10161 -- Create proper defining name for the body, to correspond to
10162 -- the one in the spec.
10164 Set_Defining_Unit_Name (Specification (Act_Body),
10165 Make_Defining_Identifier
10166 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
10167 Set_Corresponding_Spec (Act_Body, Anon_Id);
10168 Set_Has_Completion (Anon_Id);
10169 Check_Generic_Actuals (Pack_Id, False);
10171 -- Generate a reference to link the visible subprogram instance to
10172 -- the generic body, which for navigation purposes is the only
10173 -- available source for the instance.
10176 (Related_Instance (Pack_Id),
10177 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
10179 -- If it is a child unit, make the parent instance (which is an
10180 -- instance of the parent of the generic) visible. The parent
10181 -- instance is the prefix of the name of the generic unit.
10183 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10184 and then Nkind (Gen_Id) = N_Expanded_Name
10186 Par_Ent := Entity (Prefix (Gen_Id));
10187 Par_Vis := Is_Immediately_Visible (Par_Ent);
10188 Install_Parent (Par_Ent, In_Body => True);
10189 Parent_Installed := True;
10191 elsif Is_Child_Unit (Gen_Unit) then
10192 Par_Ent := Scope (Gen_Unit);
10193 Par_Vis := Is_Immediately_Visible (Par_Ent);
10194 Install_Parent (Par_Ent, In_Body => True);
10195 Parent_Installed := True;
10198 -- Inside its body, a reference to the generic unit is a reference
10199 -- to the instance. The corresponding renaming is the first
10200 -- declaration in the body.
10203 Make_Subprogram_Renaming_Declaration (Loc,
10205 Copy_Generic_Node (
10206 Specification (Original_Node (Gen_Body)),
10208 Instantiating => True),
10209 Name => New_Occurrence_Of (Anon_Id, Loc));
10211 -- If there is a formal subprogram with the same name as the unit
10212 -- itself, do not add this renaming declaration. This is a temporary
10213 -- fix for one ACVC test. ???
10215 Prev_Formal := First_Entity (Pack_Id);
10216 while Present (Prev_Formal) loop
10217 if Chars (Prev_Formal) = Chars (Gen_Unit)
10218 and then Is_Overloadable (Prev_Formal)
10223 Next_Entity (Prev_Formal);
10226 if Present (Prev_Formal) then
10227 Decls := New_List (Act_Body);
10229 Decls := New_List (Unit_Renaming, Act_Body);
10232 -- The subprogram body is placed in the body of a dummy package body,
10233 -- whose spec contains the subprogram declaration as well as the
10234 -- renaming declarations for the generic parameters.
10236 Pack_Body := Make_Package_Body (Loc,
10237 Defining_Unit_Name => New_Copy (Pack_Id),
10238 Declarations => Decls);
10240 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10242 -- If the instantiation is a library unit, then build resulting
10243 -- compilation unit nodes for the instance. The declaration of
10244 -- the enclosing package is the grandparent of the subprogram
10245 -- declaration. First replace the instantiation node as the unit
10246 -- of the corresponding compilation.
10248 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10249 if Parent (Inst_Node) = Cunit (Main_Unit) then
10250 Set_Unit (Parent (Inst_Node), Inst_Node);
10251 Build_Instance_Compilation_Unit_Nodes
10252 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
10253 Analyze (Inst_Node);
10255 Set_Parent (Pack_Body, Parent (Inst_Node));
10256 Analyze (Pack_Body);
10260 Insert_Before (Inst_Node, Pack_Body);
10261 Mark_Rewrite_Insertion (Pack_Body);
10262 Analyze (Pack_Body);
10264 if Expander_Active then
10265 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
10269 Inherit_Context (Gen_Body, Inst_Node);
10271 Restore_Private_Views (Pack_Id, False);
10273 if Parent_Installed then
10274 Remove_Parent (In_Body => True);
10276 -- Restore the previous visibility of the parent
10278 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
10282 Style_Check := Save_Style_Check;
10284 -- Body not found. Error was emitted already. If there were no previous
10285 -- errors, this may be an instance whose scope is a premature instance.
10286 -- In that case we must insure that the (legal) program does raise
10287 -- program error if executed. We generate a subprogram body for this
10288 -- purpose. See DEC ac30vso.
10290 -- Should not reference proprietary DEC tests in comments ???
10292 elsif Serious_Errors_Detected = 0
10293 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
10295 if Body_Optional then
10298 elsif Ekind (Anon_Id) = E_Procedure then
10300 Make_Subprogram_Body (Loc,
10302 Make_Procedure_Specification (Loc,
10303 Defining_Unit_Name =>
10304 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10305 Parameter_Specifications =>
10307 (Parameter_Specifications (Parent (Anon_Id)))),
10309 Declarations => Empty_List,
10310 Handled_Statement_Sequence =>
10311 Make_Handled_Sequence_Of_Statements (Loc,
10314 Make_Raise_Program_Error (Loc,
10316 PE_Access_Before_Elaboration))));
10320 Make_Raise_Program_Error (Loc,
10321 Reason => PE_Access_Before_Elaboration);
10323 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
10324 Set_Analyzed (Ret_Expr);
10327 Make_Subprogram_Body (Loc,
10329 Make_Function_Specification (Loc,
10330 Defining_Unit_Name =>
10331 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10332 Parameter_Specifications =>
10334 (Parameter_Specifications (Parent (Anon_Id))),
10335 Result_Definition =>
10336 New_Occurrence_Of (Etype (Anon_Id), Loc)),
10338 Declarations => Empty_List,
10339 Handled_Statement_Sequence =>
10340 Make_Handled_Sequence_Of_Statements (Loc,
10343 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
10346 Pack_Body := Make_Package_Body (Loc,
10347 Defining_Unit_Name => New_Copy (Pack_Id),
10348 Declarations => New_List (Act_Body));
10350 Insert_After (Inst_Node, Pack_Body);
10351 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10352 Analyze (Pack_Body);
10355 Expander_Mode_Restore;
10356 end Instantiate_Subprogram_Body;
10358 ----------------------
10359 -- Instantiate_Type --
10360 ----------------------
10362 function Instantiate_Type
10365 Analyzed_Formal : Node_Id;
10366 Actual_Decls : List_Id) return List_Id
10368 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
10369 A_Gen_T : constant Entity_Id :=
10370 Defining_Identifier (Analyzed_Formal);
10371 Ancestor : Entity_Id := Empty;
10372 Def : constant Node_Id := Formal_Type_Definition (Formal);
10374 Decl_Node : Node_Id;
10375 Decl_Nodes : List_Id;
10379 procedure Validate_Array_Type_Instance;
10380 procedure Validate_Access_Subprogram_Instance;
10381 procedure Validate_Access_Type_Instance;
10382 procedure Validate_Derived_Type_Instance;
10383 procedure Validate_Derived_Interface_Type_Instance;
10384 procedure Validate_Discriminated_Formal_Type;
10385 procedure Validate_Interface_Type_Instance;
10386 procedure Validate_Private_Type_Instance;
10387 procedure Validate_Incomplete_Type_Instance;
10388 -- These procedures perform validation tests for the named case.
10389 -- Validate_Discriminated_Formal_Type is shared by formal private
10390 -- types and Ada 2012 formal incomplete types.
10392 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
10393 -- Check that base types are the same and that the subtypes match
10394 -- statically. Used in several of the above.
10396 --------------------
10397 -- Subtypes_Match --
10398 --------------------
10400 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
10401 T : constant Entity_Id := Get_Instance_Of (Gen_T);
10404 return (Base_Type (T) = Base_Type (Act_T)
10405 and then Subtypes_Statically_Match (T, Act_T))
10407 or else (Is_Class_Wide_Type (Gen_T)
10408 and then Is_Class_Wide_Type (Act_T)
10411 (Get_Instance_Of (Root_Type (Gen_T)),
10412 Root_Type (Act_T)))
10415 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
10416 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
10417 and then Ekind (Act_T) = Ekind (Gen_T)
10419 Subtypes_Statically_Match
10420 (Designated_Type (Gen_T), Designated_Type (Act_T)));
10421 end Subtypes_Match;
10423 -----------------------------------------
10424 -- Validate_Access_Subprogram_Instance --
10425 -----------------------------------------
10427 procedure Validate_Access_Subprogram_Instance is
10429 if not Is_Access_Type (Act_T)
10430 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
10433 ("expect access type in instantiation of &", Actual, Gen_T);
10434 Abandon_Instantiation (Actual);
10437 -- According to AI05-288, actuals for access_to_subprograms must be
10438 -- subtype conformant with the generic formal. Previous to AI05-288
10439 -- only mode conformance was required.
10441 -- This is a binding interpretation that applies to previous versions
10442 -- of the language, but for now we retain the milder check in order
10443 -- to preserve ACATS tests.
10444 -- These will be protested eventually ???
10446 if Ada_Version < Ada_2012 then
10447 Check_Mode_Conformant
10448 (Designated_Type (Act_T),
10449 Designated_Type (A_Gen_T),
10454 Check_Subtype_Conformant
10455 (Designated_Type (Act_T),
10456 Designated_Type (A_Gen_T),
10461 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
10462 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
10464 ("protected access type not allowed for formal &",
10468 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
10470 ("expect protected access type for formal &",
10473 end Validate_Access_Subprogram_Instance;
10475 -----------------------------------
10476 -- Validate_Access_Type_Instance --
10477 -----------------------------------
10479 procedure Validate_Access_Type_Instance is
10480 Desig_Type : constant Entity_Id :=
10481 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
10482 Desig_Act : Entity_Id;
10485 if not Is_Access_Type (Act_T) then
10487 ("expect access type in instantiation of &", Actual, Gen_T);
10488 Abandon_Instantiation (Actual);
10491 if Is_Access_Constant (A_Gen_T) then
10492 if not Is_Access_Constant (Act_T) then
10494 ("actual type must be access-to-constant type", Actual);
10495 Abandon_Instantiation (Actual);
10498 if Is_Access_Constant (Act_T) then
10500 ("actual type must be access-to-variable type", Actual);
10501 Abandon_Instantiation (Actual);
10503 elsif Ekind (A_Gen_T) = E_General_Access_Type
10504 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
10506 Error_Msg_N -- CODEFIX
10507 ("actual must be general access type!", Actual);
10508 Error_Msg_NE -- CODEFIX
10509 ("add ALL to }!", Actual, Act_T);
10510 Abandon_Instantiation (Actual);
10514 -- The designated subtypes, that is to say the subtypes introduced
10515 -- by an access type declaration (and not by a subtype declaration)
10518 Desig_Act := Designated_Type (Base_Type (Act_T));
10520 -- The designated type may have been introduced through a limited_
10521 -- with clause, in which case retrieve the non-limited view. This
10522 -- applies to incomplete types as well as to class-wide types.
10524 if From_With_Type (Desig_Act) then
10525 Desig_Act := Available_View (Desig_Act);
10528 if not Subtypes_Match
10529 (Desig_Type, Desig_Act) then
10531 ("designated type of actual does not match that of formal &",
10533 Abandon_Instantiation (Actual);
10535 elsif Is_Access_Type (Designated_Type (Act_T))
10536 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
10538 Is_Constrained (Designated_Type (Desig_Type))
10541 ("designated type of actual does not match that of formal &",
10543 Abandon_Instantiation (Actual);
10546 -- Ada 2005: null-exclusion indicators of the two types must agree
10548 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
10550 ("non null exclusion of actual and formal & do not match",
10553 end Validate_Access_Type_Instance;
10555 ----------------------------------
10556 -- Validate_Array_Type_Instance --
10557 ----------------------------------
10559 procedure Validate_Array_Type_Instance is
10564 function Formal_Dimensions return Int;
10565 -- Count number of dimensions in array type formal
10567 -----------------------
10568 -- Formal_Dimensions --
10569 -----------------------
10571 function Formal_Dimensions return Int is
10576 if Nkind (Def) = N_Constrained_Array_Definition then
10577 Index := First (Discrete_Subtype_Definitions (Def));
10579 Index := First (Subtype_Marks (Def));
10582 while Present (Index) loop
10584 Next_Index (Index);
10588 end Formal_Dimensions;
10590 -- Start of processing for Validate_Array_Type_Instance
10593 if not Is_Array_Type (Act_T) then
10595 ("expect array type in instantiation of &", Actual, Gen_T);
10596 Abandon_Instantiation (Actual);
10598 elsif Nkind (Def) = N_Constrained_Array_Definition then
10599 if not (Is_Constrained (Act_T)) then
10601 ("expect constrained array in instantiation of &",
10603 Abandon_Instantiation (Actual);
10607 if Is_Constrained (Act_T) then
10609 ("expect unconstrained array in instantiation of &",
10611 Abandon_Instantiation (Actual);
10615 if Formal_Dimensions /= Number_Dimensions (Act_T) then
10617 ("dimensions of actual do not match formal &", Actual, Gen_T);
10618 Abandon_Instantiation (Actual);
10621 I1 := First_Index (A_Gen_T);
10622 I2 := First_Index (Act_T);
10623 for J in 1 .. Formal_Dimensions loop
10625 -- If the indexes of the actual were given by a subtype_mark,
10626 -- the index was transformed into a range attribute. Retrieve
10627 -- the original type mark for checking.
10629 if Is_Entity_Name (Original_Node (I2)) then
10630 T2 := Entity (Original_Node (I2));
10635 if not Subtypes_Match
10636 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
10639 ("index types of actual do not match those of formal &",
10641 Abandon_Instantiation (Actual);
10648 -- Check matching subtypes. Note that there are complex visibility
10649 -- issues when the generic is a child unit and some aspect of the
10650 -- generic type is declared in a parent unit of the generic. We do
10651 -- the test to handle this special case only after a direct check
10652 -- for static matching has failed.
10655 (Component_Type (A_Gen_T), Component_Type (Act_T))
10656 or else Subtypes_Match
10657 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
10658 Component_Type (Act_T))
10663 ("component subtype of actual does not match that of formal &",
10665 Abandon_Instantiation (Actual);
10668 if Has_Aliased_Components (A_Gen_T)
10669 and then not Has_Aliased_Components (Act_T)
10672 ("actual must have aliased components to match formal type &",
10675 end Validate_Array_Type_Instance;
10677 -----------------------------------------------
10678 -- Validate_Derived_Interface_Type_Instance --
10679 -----------------------------------------------
10681 procedure Validate_Derived_Interface_Type_Instance is
10682 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
10686 -- First apply interface instance checks
10688 Validate_Interface_Type_Instance;
10690 -- Verify that immediate parent interface is an ancestor of
10694 and then not Interface_Present_In_Ancestor (Act_T, Par)
10697 ("interface actual must include progenitor&", Actual, Par);
10700 -- Now verify that the actual includes all other ancestors of
10703 Elmt := First_Elmt (Interfaces (A_Gen_T));
10704 while Present (Elmt) loop
10705 if not Interface_Present_In_Ancestor
10706 (Act_T, Get_Instance_Of (Node (Elmt)))
10709 ("interface actual must include progenitor&",
10710 Actual, Node (Elmt));
10715 end Validate_Derived_Interface_Type_Instance;
10717 ------------------------------------
10718 -- Validate_Derived_Type_Instance --
10719 ------------------------------------
10721 procedure Validate_Derived_Type_Instance is
10722 Actual_Discr : Entity_Id;
10723 Ancestor_Discr : Entity_Id;
10726 -- If the parent type in the generic declaration is itself a previous
10727 -- formal type, then it is local to the generic and absent from the
10728 -- analyzed generic definition. In that case the ancestor is the
10729 -- instance of the formal (which must have been instantiated
10730 -- previously), unless the ancestor is itself a formal derived type.
10731 -- In this latter case (which is the subject of Corrigendum 8652/0038
10732 -- (AI-202) the ancestor of the formals is the ancestor of its
10733 -- parent. Otherwise, the analyzed generic carries the parent type.
10734 -- If the parent type is defined in a previous formal package, then
10735 -- the scope of that formal package is that of the generic type
10736 -- itself, and it has already been mapped into the corresponding type
10737 -- in the actual package.
10739 -- Common case: parent type defined outside of the generic
10741 if Is_Entity_Name (Subtype_Mark (Def))
10742 and then Present (Entity (Subtype_Mark (Def)))
10744 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
10746 -- Check whether parent is defined in a previous formal package
10749 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
10752 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
10754 -- The type may be a local derivation, or a type extension of a
10755 -- previous formal, or of a formal of a parent package.
10757 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
10759 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
10761 -- Check whether the parent is another derived formal type in the
10762 -- same generic unit.
10764 if Etype (A_Gen_T) /= A_Gen_T
10765 and then Is_Generic_Type (Etype (A_Gen_T))
10766 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
10767 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
10769 -- Locate ancestor of parent from the subtype declaration
10770 -- created for the actual.
10776 Decl := First (Actual_Decls);
10777 while Present (Decl) loop
10778 if Nkind (Decl) = N_Subtype_Declaration
10779 and then Chars (Defining_Identifier (Decl)) =
10780 Chars (Etype (A_Gen_T))
10782 Ancestor := Generic_Parent_Type (Decl);
10790 pragma Assert (Present (Ancestor));
10794 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
10798 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
10801 -- If the formal derived type has pragma Preelaborable_Initialization
10802 -- then the actual type must have preelaborable initialization.
10804 if Known_To_Have_Preelab_Init (A_Gen_T)
10805 and then not Has_Preelaborable_Initialization (Act_T)
10808 ("actual for & must have preelaborable initialization",
10812 -- Ada 2005 (AI-251)
10814 if Ada_Version >= Ada_2005
10815 and then Is_Interface (Ancestor)
10817 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
10819 ("(Ada 2005) expected type implementing & in instantiation",
10823 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
10825 ("expect type derived from & in instantiation",
10826 Actual, First_Subtype (Ancestor));
10827 Abandon_Instantiation (Actual);
10830 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10831 -- that the formal type declaration has been rewritten as a private
10834 if Ada_Version >= Ada_2005
10835 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
10836 and then Synchronized_Present (Parent (A_Gen_T))
10838 -- The actual must be a synchronized tagged type
10840 if not Is_Tagged_Type (Act_T) then
10842 ("actual of synchronized type must be tagged", Actual);
10843 Abandon_Instantiation (Actual);
10845 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
10846 and then Nkind (Type_Definition (Parent (Act_T))) =
10847 N_Derived_Type_Definition
10848 and then not Synchronized_Present (Type_Definition
10852 ("actual of synchronized type must be synchronized", Actual);
10853 Abandon_Instantiation (Actual);
10857 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
10858 -- removes the second instance of the phrase "or allow pass by copy".
10860 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
10862 ("cannot have atomic actual type for non-atomic formal type",
10865 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
10867 ("cannot have volatile actual type for non-volatile formal type",
10871 -- It should not be necessary to check for unknown discriminants on
10872 -- Formal, but for some reason Has_Unknown_Discriminants is false for
10873 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
10874 -- needs fixing. ???
10876 if not Is_Indefinite_Subtype (A_Gen_T)
10877 and then not Unknown_Discriminants_Present (Formal)
10878 and then Is_Indefinite_Subtype (Act_T)
10881 ("actual subtype must be constrained", Actual);
10882 Abandon_Instantiation (Actual);
10885 if not Unknown_Discriminants_Present (Formal) then
10886 if Is_Constrained (Ancestor) then
10887 if not Is_Constrained (Act_T) then
10889 ("actual subtype must be constrained", Actual);
10890 Abandon_Instantiation (Actual);
10893 -- Ancestor is unconstrained, Check if generic formal and actual
10894 -- agree on constrainedness. The check only applies to array types
10895 -- and discriminated types.
10897 elsif Is_Constrained (Act_T) then
10898 if Ekind (Ancestor) = E_Access_Type
10900 (not Is_Constrained (A_Gen_T)
10901 and then Is_Composite_Type (A_Gen_T))
10904 ("actual subtype must be unconstrained", Actual);
10905 Abandon_Instantiation (Actual);
10908 -- A class-wide type is only allowed if the formal has unknown
10911 elsif Is_Class_Wide_Type (Act_T)
10912 and then not Has_Unknown_Discriminants (Ancestor)
10915 ("actual for & cannot be a class-wide type", Actual, Gen_T);
10916 Abandon_Instantiation (Actual);
10918 -- Otherwise, the formal and actual shall have the same number
10919 -- of discriminants and each discriminant of the actual must
10920 -- correspond to a discriminant of the formal.
10922 elsif Has_Discriminants (Act_T)
10923 and then not Has_Unknown_Discriminants (Act_T)
10924 and then Has_Discriminants (Ancestor)
10926 Actual_Discr := First_Discriminant (Act_T);
10927 Ancestor_Discr := First_Discriminant (Ancestor);
10928 while Present (Actual_Discr)
10929 and then Present (Ancestor_Discr)
10931 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
10932 No (Corresponding_Discriminant (Actual_Discr))
10935 ("discriminant & does not correspond " &
10936 "to ancestor discriminant", Actual, Actual_Discr);
10937 Abandon_Instantiation (Actual);
10940 Next_Discriminant (Actual_Discr);
10941 Next_Discriminant (Ancestor_Discr);
10944 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
10946 ("actual for & must have same number of discriminants",
10948 Abandon_Instantiation (Actual);
10951 -- This case should be caught by the earlier check for
10952 -- constrainedness, but the check here is added for completeness.
10954 elsif Has_Discriminants (Act_T)
10955 and then not Has_Unknown_Discriminants (Act_T)
10958 ("actual for & must not have discriminants", Actual, Gen_T);
10959 Abandon_Instantiation (Actual);
10961 elsif Has_Discriminants (Ancestor) then
10963 ("actual for & must have known discriminants", Actual, Gen_T);
10964 Abandon_Instantiation (Actual);
10967 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
10969 ("constraint on actual is incompatible with formal", Actual);
10970 Abandon_Instantiation (Actual);
10974 -- If the formal and actual types are abstract, check that there
10975 -- are no abstract primitives of the actual type that correspond to
10976 -- nonabstract primitives of the formal type (second sentence of
10979 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
10980 Check_Abstract_Primitives : declare
10981 Gen_Prims : constant Elist_Id :=
10982 Primitive_Operations (A_Gen_T);
10983 Gen_Elmt : Elmt_Id;
10984 Gen_Subp : Entity_Id;
10985 Anc_Subp : Entity_Id;
10986 Anc_Formal : Entity_Id;
10987 Anc_F_Type : Entity_Id;
10989 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
10990 Act_Elmt : Elmt_Id;
10991 Act_Subp : Entity_Id;
10992 Act_Formal : Entity_Id;
10993 Act_F_Type : Entity_Id;
10995 Subprograms_Correspond : Boolean;
10997 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
10998 -- Returns true if T2 is derived directly or indirectly from
10999 -- T1, including derivations from interfaces. T1 and T2 are
11000 -- required to be specific tagged base types.
11002 ------------------------
11003 -- Is_Tagged_Ancestor --
11004 ------------------------
11006 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
11008 Intfc_Elmt : Elmt_Id;
11011 -- The predicate is satisfied if the types are the same
11016 -- If we've reached the top of the derivation chain then
11017 -- we know that T1 is not an ancestor of T2.
11019 elsif Etype (T2) = T2 then
11022 -- Proceed to check T2's immediate parent
11024 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
11027 -- Finally, check to see if T1 is an ancestor of any of T2's
11031 Intfc_Elmt := First_Elmt (Interfaces (T2));
11032 while Present (Intfc_Elmt) loop
11033 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
11037 Next_Elmt (Intfc_Elmt);
11042 end Is_Tagged_Ancestor;
11044 -- Start of processing for Check_Abstract_Primitives
11047 -- Loop over all of the formal derived type's primitives
11049 Gen_Elmt := First_Elmt (Gen_Prims);
11050 while Present (Gen_Elmt) loop
11051 Gen_Subp := Node (Gen_Elmt);
11053 -- If the primitive of the formal is not abstract, then
11054 -- determine whether there is a corresponding primitive of
11055 -- the actual type that's abstract.
11057 if not Is_Abstract_Subprogram (Gen_Subp) then
11058 Act_Elmt := First_Elmt (Act_Prims);
11059 while Present (Act_Elmt) loop
11060 Act_Subp := Node (Act_Elmt);
11062 -- If we find an abstract primitive of the actual,
11063 -- then we need to test whether it corresponds to the
11064 -- subprogram from which the generic formal primitive
11067 if Is_Abstract_Subprogram (Act_Subp) then
11068 Anc_Subp := Alias (Gen_Subp);
11070 -- Test whether we have a corresponding primitive
11071 -- by comparing names, kinds, formal types, and
11074 if Chars (Anc_Subp) = Chars (Act_Subp)
11075 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
11077 Anc_Formal := First_Formal (Anc_Subp);
11078 Act_Formal := First_Formal (Act_Subp);
11079 while Present (Anc_Formal)
11080 and then Present (Act_Formal)
11082 Anc_F_Type := Etype (Anc_Formal);
11083 Act_F_Type := Etype (Act_Formal);
11085 if Ekind (Anc_F_Type)
11086 = E_Anonymous_Access_Type
11088 Anc_F_Type := Designated_Type (Anc_F_Type);
11090 if Ekind (Act_F_Type)
11091 = E_Anonymous_Access_Type
11094 Designated_Type (Act_F_Type);
11100 Ekind (Act_F_Type) = E_Anonymous_Access_Type
11105 Anc_F_Type := Base_Type (Anc_F_Type);
11106 Act_F_Type := Base_Type (Act_F_Type);
11108 -- If the formal is controlling, then the
11109 -- the type of the actual primitive's formal
11110 -- must be derived directly or indirectly
11111 -- from the type of the ancestor primitive's
11114 if Is_Controlling_Formal (Anc_Formal) then
11115 if not Is_Tagged_Ancestor
11116 (Anc_F_Type, Act_F_Type)
11121 -- Otherwise the types of the formals must
11124 elsif Anc_F_Type /= Act_F_Type then
11128 Next_Entity (Anc_Formal);
11129 Next_Entity (Act_Formal);
11132 -- If we traversed through all of the formals
11133 -- then so far the subprograms correspond, so
11134 -- now check that any result types correspond.
11136 if No (Anc_Formal) and then No (Act_Formal) then
11137 Subprograms_Correspond := True;
11139 if Ekind (Act_Subp) = E_Function then
11140 Anc_F_Type := Etype (Anc_Subp);
11141 Act_F_Type := Etype (Act_Subp);
11143 if Ekind (Anc_F_Type)
11144 = E_Anonymous_Access_Type
11147 Designated_Type (Anc_F_Type);
11149 if Ekind (Act_F_Type)
11150 = E_Anonymous_Access_Type
11153 Designated_Type (Act_F_Type);
11155 Subprograms_Correspond := False;
11160 = E_Anonymous_Access_Type
11162 Subprograms_Correspond := False;
11165 Anc_F_Type := Base_Type (Anc_F_Type);
11166 Act_F_Type := Base_Type (Act_F_Type);
11168 -- Now either the result types must be
11169 -- the same or, if the result type is
11170 -- controlling, the result type of the
11171 -- actual primitive must descend from the
11172 -- result type of the ancestor primitive.
11174 if Subprograms_Correspond
11175 and then Anc_F_Type /= Act_F_Type
11177 Has_Controlling_Result (Anc_Subp)
11179 not Is_Tagged_Ancestor
11180 (Anc_F_Type, Act_F_Type)
11182 Subprograms_Correspond := False;
11186 -- Found a matching subprogram belonging to
11187 -- formal ancestor type, so actual subprogram
11188 -- corresponds and this violates 3.9.3(9).
11190 if Subprograms_Correspond then
11192 ("abstract subprogram & overrides " &
11193 "nonabstract subprogram of ancestor",
11201 Next_Elmt (Act_Elmt);
11205 Next_Elmt (Gen_Elmt);
11207 end Check_Abstract_Primitives;
11210 -- Verify that limitedness matches. If parent is a limited
11211 -- interface then the generic formal is not unless declared
11212 -- explicitly so. If not declared limited, the actual cannot be
11213 -- limited (see AI05-0087).
11215 -- Even though this AI is a binding interpretation, we enable the
11216 -- check only in Ada 2012 mode, because this improper construct
11217 -- shows up in user code and in existing B-tests.
11219 if Is_Limited_Type (Act_T)
11220 and then not Is_Limited_Type (A_Gen_T)
11221 and then Ada_Version >= Ada_2012
11223 if In_Instance then
11227 ("actual for non-limited & cannot be a limited type", Actual,
11229 Explain_Limited_Type (Act_T, Actual);
11230 Abandon_Instantiation (Actual);
11233 end Validate_Derived_Type_Instance;
11235 ----------------------------------------
11236 -- Validate_Discriminated_Formal_Type --
11237 ----------------------------------------
11239 procedure Validate_Discriminated_Formal_Type is
11240 Formal_Discr : Entity_Id;
11241 Actual_Discr : Entity_Id;
11242 Formal_Subt : Entity_Id;
11245 if Has_Discriminants (A_Gen_T) then
11246 if not Has_Discriminants (Act_T) then
11248 ("actual for & must have discriminants", Actual, Gen_T);
11249 Abandon_Instantiation (Actual);
11251 elsif Is_Constrained (Act_T) then
11253 ("actual for & must be unconstrained", Actual, Gen_T);
11254 Abandon_Instantiation (Actual);
11257 Formal_Discr := First_Discriminant (A_Gen_T);
11258 Actual_Discr := First_Discriminant (Act_T);
11259 while Formal_Discr /= Empty loop
11260 if Actual_Discr = Empty then
11262 ("discriminants on actual do not match formal",
11264 Abandon_Instantiation (Actual);
11267 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
11269 -- Access discriminants match if designated types do
11271 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
11272 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
11273 E_Anonymous_Access_Type
11276 (Designated_Type (Base_Type (Formal_Subt))) =
11277 Designated_Type (Base_Type (Etype (Actual_Discr)))
11281 elsif Base_Type (Formal_Subt) /=
11282 Base_Type (Etype (Actual_Discr))
11285 ("types of actual discriminants must match formal",
11287 Abandon_Instantiation (Actual);
11289 elsif not Subtypes_Statically_Match
11290 (Formal_Subt, Etype (Actual_Discr))
11291 and then Ada_Version >= Ada_95
11294 ("subtypes of actual discriminants must match formal",
11296 Abandon_Instantiation (Actual);
11299 Next_Discriminant (Formal_Discr);
11300 Next_Discriminant (Actual_Discr);
11303 if Actual_Discr /= Empty then
11305 ("discriminants on actual do not match formal",
11307 Abandon_Instantiation (Actual);
11311 end Validate_Discriminated_Formal_Type;
11313 ---------------------------------------
11314 -- Validate_Incomplete_Type_Instance --
11315 ---------------------------------------
11317 procedure Validate_Incomplete_Type_Instance is
11319 if not Is_Tagged_Type (Act_T)
11320 and then Is_Tagged_Type (A_Gen_T)
11323 ("actual for & must be a tagged type", Actual, Gen_T);
11326 Validate_Discriminated_Formal_Type;
11327 end Validate_Incomplete_Type_Instance;
11329 --------------------------------------
11330 -- Validate_Interface_Type_Instance --
11331 --------------------------------------
11333 procedure Validate_Interface_Type_Instance is
11335 if not Is_Interface (Act_T) then
11337 ("actual for formal interface type must be an interface",
11340 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
11342 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
11344 Is_Protected_Interface (A_Gen_T) /=
11345 Is_Protected_Interface (Act_T)
11347 Is_Synchronized_Interface (A_Gen_T) /=
11348 Is_Synchronized_Interface (Act_T)
11351 ("actual for interface& does not match (RM 12.5.5(4))",
11354 end Validate_Interface_Type_Instance;
11356 ------------------------------------
11357 -- Validate_Private_Type_Instance --
11358 ------------------------------------
11360 procedure Validate_Private_Type_Instance is
11362 if Is_Limited_Type (Act_T)
11363 and then not Is_Limited_Type (A_Gen_T)
11365 if In_Instance then
11369 ("actual for non-limited & cannot be a limited type", Actual,
11371 Explain_Limited_Type (Act_T, Actual);
11372 Abandon_Instantiation (Actual);
11375 elsif Known_To_Have_Preelab_Init (A_Gen_T)
11376 and then not Has_Preelaborable_Initialization (Act_T)
11379 ("actual for & must have preelaborable initialization", Actual,
11382 elsif Is_Indefinite_Subtype (Act_T)
11383 and then not Is_Indefinite_Subtype (A_Gen_T)
11384 and then Ada_Version >= Ada_95
11387 ("actual for & must be a definite subtype", Actual, Gen_T);
11389 elsif not Is_Tagged_Type (Act_T)
11390 and then Is_Tagged_Type (A_Gen_T)
11393 ("actual for & must be a tagged type", Actual, Gen_T);
11396 Validate_Discriminated_Formal_Type;
11398 end Validate_Private_Type_Instance;
11400 -- Start of processing for Instantiate_Type
11403 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
11404 Error_Msg_N ("duplicate instantiation of generic type", Actual);
11405 return New_List (Error);
11407 elsif not Is_Entity_Name (Actual)
11408 or else not Is_Type (Entity (Actual))
11411 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
11412 Abandon_Instantiation (Actual);
11415 Act_T := Entity (Actual);
11417 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
11418 -- as a generic actual parameter if the corresponding formal type
11419 -- does not have a known_discriminant_part, or is a formal derived
11420 -- type that is an Unchecked_Union type.
11422 if Is_Unchecked_Union (Base_Type (Act_T)) then
11423 if not Has_Discriminants (A_Gen_T)
11425 (Is_Derived_Type (A_Gen_T)
11427 Is_Unchecked_Union (A_Gen_T))
11431 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
11432 " discriminated formal type", Act_T);
11437 -- Deal with fixed/floating restrictions
11439 if Is_Floating_Point_Type (Act_T) then
11440 Check_Restriction (No_Floating_Point, Actual);
11441 elsif Is_Fixed_Point_Type (Act_T) then
11442 Check_Restriction (No_Fixed_Point, Actual);
11445 -- Deal with error of using incomplete type as generic actual.
11446 -- This includes limited views of a type, even if the non-limited
11447 -- view may be available.
11449 if Ekind (Act_T) = E_Incomplete_Type
11450 or else (Is_Class_Wide_Type (Act_T)
11452 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
11454 -- If the formal is an incomplete type, the actual can be
11455 -- incomplete as well.
11457 if Ekind (A_Gen_T) = E_Incomplete_Type then
11460 elsif Is_Class_Wide_Type (Act_T)
11461 or else No (Full_View (Act_T))
11463 Error_Msg_N ("premature use of incomplete type", Actual);
11464 Abandon_Instantiation (Actual);
11466 Act_T := Full_View (Act_T);
11467 Set_Entity (Actual, Act_T);
11469 if Has_Private_Component (Act_T) then
11471 ("premature use of type with private component", Actual);
11475 -- Deal with error of premature use of private type as generic actual
11477 elsif Is_Private_Type (Act_T)
11478 and then Is_Private_Type (Base_Type (Act_T))
11479 and then not Is_Generic_Type (Act_T)
11480 and then not Is_Derived_Type (Act_T)
11481 and then No (Full_View (Root_Type (Act_T)))
11483 -- If the formal is an incomplete type, the actual can be
11484 -- private or incomplete as well.
11486 if Ekind (A_Gen_T) = E_Incomplete_Type then
11489 Error_Msg_N ("premature use of private type", Actual);
11492 elsif Has_Private_Component (Act_T) then
11494 ("premature use of type with private component", Actual);
11497 Set_Instance_Of (A_Gen_T, Act_T);
11499 -- If the type is generic, the class-wide type may also be used
11501 if Is_Tagged_Type (A_Gen_T)
11502 and then Is_Tagged_Type (Act_T)
11503 and then not Is_Class_Wide_Type (A_Gen_T)
11505 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
11506 Class_Wide_Type (Act_T));
11509 if not Is_Abstract_Type (A_Gen_T)
11510 and then Is_Abstract_Type (Act_T)
11513 ("actual of non-abstract formal cannot be abstract", Actual);
11516 -- A generic scalar type is a first subtype for which we generate
11517 -- an anonymous base type. Indicate that the instance of this base
11518 -- is the base type of the actual.
11520 if Is_Scalar_Type (A_Gen_T) then
11521 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
11525 if Error_Posted (Act_T) then
11528 case Nkind (Def) is
11529 when N_Formal_Private_Type_Definition =>
11530 Validate_Private_Type_Instance;
11532 when N_Formal_Incomplete_Type_Definition =>
11533 Validate_Incomplete_Type_Instance;
11535 when N_Formal_Derived_Type_Definition =>
11536 Validate_Derived_Type_Instance;
11538 when N_Formal_Discrete_Type_Definition =>
11539 if not Is_Discrete_Type (Act_T) then
11541 ("expect discrete type in instantiation of&",
11543 Abandon_Instantiation (Actual);
11546 when N_Formal_Signed_Integer_Type_Definition =>
11547 if not Is_Signed_Integer_Type (Act_T) then
11549 ("expect signed integer type in instantiation of&",
11551 Abandon_Instantiation (Actual);
11554 when N_Formal_Modular_Type_Definition =>
11555 if not Is_Modular_Integer_Type (Act_T) then
11557 ("expect modular type in instantiation of &",
11559 Abandon_Instantiation (Actual);
11562 when N_Formal_Floating_Point_Definition =>
11563 if not Is_Floating_Point_Type (Act_T) then
11565 ("expect float type in instantiation of &", Actual, Gen_T);
11566 Abandon_Instantiation (Actual);
11569 when N_Formal_Ordinary_Fixed_Point_Definition =>
11570 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
11572 ("expect ordinary fixed point type in instantiation of &",
11574 Abandon_Instantiation (Actual);
11577 when N_Formal_Decimal_Fixed_Point_Definition =>
11578 if not Is_Decimal_Fixed_Point_Type (Act_T) then
11580 ("expect decimal type in instantiation of &",
11582 Abandon_Instantiation (Actual);
11585 when N_Array_Type_Definition =>
11586 Validate_Array_Type_Instance;
11588 when N_Access_To_Object_Definition =>
11589 Validate_Access_Type_Instance;
11591 when N_Access_Function_Definition |
11592 N_Access_Procedure_Definition =>
11593 Validate_Access_Subprogram_Instance;
11595 when N_Record_Definition =>
11596 Validate_Interface_Type_Instance;
11598 when N_Derived_Type_Definition =>
11599 Validate_Derived_Interface_Type_Instance;
11602 raise Program_Error;
11607 Subt := New_Copy (Gen_T);
11609 -- Use adjusted sloc of subtype name as the location for other nodes in
11610 -- the subtype declaration.
11612 Loc := Sloc (Subt);
11615 Make_Subtype_Declaration (Loc,
11616 Defining_Identifier => Subt,
11617 Subtype_Indication => New_Reference_To (Act_T, Loc));
11619 if Is_Private_Type (Act_T) then
11620 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11622 elsif Is_Access_Type (Act_T)
11623 and then Is_Private_Type (Designated_Type (Act_T))
11625 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11628 Decl_Nodes := New_List (Decl_Node);
11630 -- Flag actual derived types so their elaboration produces the
11631 -- appropriate renamings for the primitive operations of the ancestor.
11632 -- Flag actual for formal private types as well, to determine whether
11633 -- operations in the private part may override inherited operations.
11634 -- If the formal has an interface list, the ancestor is not the
11635 -- parent, but the analyzed formal that includes the interface
11636 -- operations of all its progenitors.
11638 -- Same treatment for formal private types, so we can check whether the
11639 -- type is tagged limited when validating derivations in the private
11640 -- part. (See AI05-096).
11642 if Nkind (Def) = N_Formal_Derived_Type_Definition then
11643 if Present (Interface_List (Def)) then
11644 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11646 Set_Generic_Parent_Type (Decl_Node, Ancestor);
11649 elsif Nkind_In (Def,
11650 N_Formal_Private_Type_Definition,
11651 N_Formal_Incomplete_Type_Definition)
11653 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11656 -- If the actual is a synchronized type that implements an interface,
11657 -- the primitive operations are attached to the corresponding record,
11658 -- and we have to treat it as an additional generic actual, so that its
11659 -- primitive operations become visible in the instance. The task or
11660 -- protected type itself does not carry primitive operations.
11662 if Is_Concurrent_Type (Act_T)
11663 and then Is_Tagged_Type (Act_T)
11664 and then Present (Corresponding_Record_Type (Act_T))
11665 and then Present (Ancestor)
11666 and then Is_Interface (Ancestor)
11669 Corr_Rec : constant Entity_Id :=
11670 Corresponding_Record_Type (Act_T);
11671 New_Corr : Entity_Id;
11672 Corr_Decl : Node_Id;
11675 New_Corr := Make_Temporary (Loc, 'S');
11677 Make_Subtype_Declaration (Loc,
11678 Defining_Identifier => New_Corr,
11679 Subtype_Indication =>
11680 New_Reference_To (Corr_Rec, Loc));
11681 Append_To (Decl_Nodes, Corr_Decl);
11683 if Ekind (Act_T) = E_Task_Type then
11684 Set_Ekind (Subt, E_Task_Subtype);
11686 Set_Ekind (Subt, E_Protected_Subtype);
11689 Set_Corresponding_Record_Type (Subt, Corr_Rec);
11690 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
11691 Set_Generic_Parent_Type (Decl_Node, Empty);
11696 end Instantiate_Type;
11698 ---------------------
11699 -- Is_In_Main_Unit --
11700 ---------------------
11702 function Is_In_Main_Unit (N : Node_Id) return Boolean is
11703 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
11704 Current_Unit : Node_Id;
11707 if Unum = Main_Unit then
11710 -- If the current unit is a subunit then it is either the main unit or
11711 -- is being compiled as part of the main unit.
11713 elsif Nkind (N) = N_Compilation_Unit then
11714 return Nkind (Unit (N)) = N_Subunit;
11717 Current_Unit := Parent (N);
11718 while Present (Current_Unit)
11719 and then Nkind (Current_Unit) /= N_Compilation_Unit
11721 Current_Unit := Parent (Current_Unit);
11724 -- The instantiation node is in the main unit, or else the current node
11725 -- (perhaps as the result of nested instantiations) is in the main unit,
11726 -- or in the declaration of the main unit, which in this last case must
11729 return Unum = Main_Unit
11730 or else Current_Unit = Cunit (Main_Unit)
11731 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
11732 or else (Present (Library_Unit (Current_Unit))
11733 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
11734 end Is_In_Main_Unit;
11736 ----------------------------
11737 -- Load_Parent_Of_Generic --
11738 ----------------------------
11740 procedure Load_Parent_Of_Generic
11743 Body_Optional : Boolean := False)
11745 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
11746 Save_Style_Check : constant Boolean := Style_Check;
11747 True_Parent : Node_Id;
11748 Inst_Node : Node_Id;
11750 Previous_Instances : constant Elist_Id := New_Elmt_List;
11752 procedure Collect_Previous_Instances (Decls : List_Id);
11753 -- Collect all instantiations in the given list of declarations, that
11754 -- precede the generic that we need to load. If the bodies of these
11755 -- instantiations are available, we must analyze them, to ensure that
11756 -- the public symbols generated are the same when the unit is compiled
11757 -- to generate code, and when it is compiled in the context of a unit
11758 -- that needs a particular nested instance. This process is applied to
11759 -- both package and subprogram instances.
11761 --------------------------------
11762 -- Collect_Previous_Instances --
11763 --------------------------------
11765 procedure Collect_Previous_Instances (Decls : List_Id) is
11769 Decl := First (Decls);
11770 while Present (Decl) loop
11771 if Sloc (Decl) >= Sloc (Inst_Node) then
11774 -- If Decl is an instantiation, then record it as requiring
11775 -- instantiation of the corresponding body, except if it is an
11776 -- abbreviated instantiation generated internally for conformance
11777 -- checking purposes only for the case of a formal package
11778 -- declared without a box (see Instantiate_Formal_Package). Such
11779 -- an instantiation does not generate any code (the actual code
11780 -- comes from actual) and thus does not need to be analyzed here.
11781 -- If the instantiation appears with a generic package body it is
11782 -- not analyzed here either.
11784 elsif Nkind (Decl) = N_Package_Instantiation
11785 and then not Is_Internal (Defining_Entity (Decl))
11787 Append_Elmt (Decl, Previous_Instances);
11789 -- For a subprogram instantiation, omit instantiations intrinsic
11790 -- operations (Unchecked_Conversions, etc.) that have no bodies.
11792 elsif Nkind_In (Decl, N_Function_Instantiation,
11793 N_Procedure_Instantiation)
11794 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
11796 Append_Elmt (Decl, Previous_Instances);
11798 elsif Nkind (Decl) = N_Package_Declaration then
11799 Collect_Previous_Instances
11800 (Visible_Declarations (Specification (Decl)));
11801 Collect_Previous_Instances
11802 (Private_Declarations (Specification (Decl)));
11804 -- Previous non-generic bodies may contain instances as well
11806 elsif Nkind (Decl) = N_Package_Body
11807 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
11809 Collect_Previous_Instances (Declarations (Decl));
11811 elsif Nkind (Decl) = N_Subprogram_Body
11812 and then not Acts_As_Spec (Decl)
11813 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
11815 Collect_Previous_Instances (Declarations (Decl));
11820 end Collect_Previous_Instances;
11822 -- Start of processing for Load_Parent_Of_Generic
11825 if not In_Same_Source_Unit (N, Spec)
11826 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
11827 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
11828 and then not Is_In_Main_Unit (Spec))
11830 -- Find body of parent of spec, and analyze it. A special case arises
11831 -- when the parent is an instantiation, that is to say when we are
11832 -- currently instantiating a nested generic. In that case, there is
11833 -- no separate file for the body of the enclosing instance. Instead,
11834 -- the enclosing body must be instantiated as if it were a pending
11835 -- instantiation, in order to produce the body for the nested generic
11836 -- we require now. Note that in that case the generic may be defined
11837 -- in a package body, the instance defined in the same package body,
11838 -- and the original enclosing body may not be in the main unit.
11840 Inst_Node := Empty;
11842 True_Parent := Parent (Spec);
11843 while Present (True_Parent)
11844 and then Nkind (True_Parent) /= N_Compilation_Unit
11846 if Nkind (True_Parent) = N_Package_Declaration
11848 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
11850 -- Parent is a compilation unit that is an instantiation.
11851 -- Instantiation node has been replaced with package decl.
11853 Inst_Node := Original_Node (True_Parent);
11856 elsif Nkind (True_Parent) = N_Package_Declaration
11857 and then Present (Generic_Parent (Specification (True_Parent)))
11858 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11860 -- Parent is an instantiation within another specification.
11861 -- Declaration for instance has been inserted before original
11862 -- instantiation node. A direct link would be preferable?
11864 Inst_Node := Next (True_Parent);
11865 while Present (Inst_Node)
11866 and then Nkind (Inst_Node) /= N_Package_Instantiation
11871 -- If the instance appears within a generic, and the generic
11872 -- unit is defined within a formal package of the enclosing
11873 -- generic, there is no generic body available, and none
11874 -- needed. A more precise test should be used ???
11876 if No (Inst_Node) then
11883 True_Parent := Parent (True_Parent);
11887 -- Case where we are currently instantiating a nested generic
11889 if Present (Inst_Node) then
11890 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
11892 -- Instantiation node and declaration of instantiated package
11893 -- were exchanged when only the declaration was needed.
11894 -- Restore instantiation node before proceeding with body.
11896 Set_Unit (Parent (True_Parent), Inst_Node);
11899 -- Now complete instantiation of enclosing body, if it appears in
11900 -- some other unit. If it appears in the current unit, the body
11901 -- will have been instantiated already.
11903 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
11905 -- We need to determine the expander mode to instantiate the
11906 -- enclosing body. Because the generic body we need may use
11907 -- global entities declared in the enclosing package (including
11908 -- aggregates) it is in general necessary to compile this body
11909 -- with expansion enabled, except if we are within a generic
11910 -- package, in which case the usual generic rule applies.
11913 Exp_Status : Boolean := True;
11917 -- Loop through scopes looking for generic package
11919 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
11920 while Present (Scop)
11921 and then Scop /= Standard_Standard
11923 if Ekind (Scop) = E_Generic_Package then
11924 Exp_Status := False;
11928 Scop := Scope (Scop);
11931 -- Collect previous instantiations in the unit that contains
11932 -- the desired generic.
11934 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11935 and then not Body_Optional
11939 Info : Pending_Body_Info;
11943 Par := Parent (Inst_Node);
11944 while Present (Par) loop
11945 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
11946 Par := Parent (Par);
11949 pragma Assert (Present (Par));
11951 if Nkind (Par) = N_Package_Body then
11952 Collect_Previous_Instances (Declarations (Par));
11954 elsif Nkind (Par) = N_Package_Declaration then
11955 Collect_Previous_Instances
11956 (Visible_Declarations (Specification (Par)));
11957 Collect_Previous_Instances
11958 (Private_Declarations (Specification (Par)));
11961 -- Enclosing unit is a subprogram body. In this
11962 -- case all instance bodies are processed in order
11963 -- and there is no need to collect them separately.
11968 Decl := First_Elmt (Previous_Instances);
11969 while Present (Decl) loop
11971 (Inst_Node => Node (Decl),
11973 Instance_Spec (Node (Decl)),
11974 Expander_Status => Exp_Status,
11975 Current_Sem_Unit =>
11976 Get_Code_Unit (Sloc (Node (Decl))),
11977 Scope_Suppress => Scope_Suppress,
11978 Local_Suppress_Stack_Top =>
11979 Local_Suppress_Stack_Top,
11980 Version => Ada_Version);
11982 -- Package instance
11985 Nkind (Node (Decl)) = N_Package_Instantiation
11987 Instantiate_Package_Body
11988 (Info, Body_Optional => True);
11990 -- Subprogram instance
11993 -- The instance_spec is the wrapper package,
11994 -- and the subprogram declaration is the last
11995 -- declaration in the wrapper.
11999 (Visible_Declarations
12000 (Specification (Info.Act_Decl)));
12002 Instantiate_Subprogram_Body
12003 (Info, Body_Optional => True);
12011 Instantiate_Package_Body
12013 ((Inst_Node => Inst_Node,
12014 Act_Decl => True_Parent,
12015 Expander_Status => Exp_Status,
12016 Current_Sem_Unit =>
12017 Get_Code_Unit (Sloc (Inst_Node)),
12018 Scope_Suppress => Scope_Suppress,
12019 Local_Suppress_Stack_Top =>
12020 Local_Suppress_Stack_Top,
12021 Version => Ada_Version)),
12022 Body_Optional => Body_Optional);
12026 -- Case where we are not instantiating a nested generic
12029 Opt.Style_Check := False;
12030 Expander_Mode_Save_And_Set (True);
12031 Load_Needed_Body (Comp_Unit, OK);
12032 Opt.Style_Check := Save_Style_Check;
12033 Expander_Mode_Restore;
12036 and then Unit_Requires_Body (Defining_Entity (Spec))
12037 and then not Body_Optional
12040 Bname : constant Unit_Name_Type :=
12041 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
12044 -- In CodePeer mode, the missing body may make the analysis
12045 -- incomplete, but we do not treat it as fatal.
12047 if CodePeer_Mode then
12051 Error_Msg_Unit_1 := Bname;
12052 Error_Msg_N ("this instantiation requires$!", N);
12053 Error_Msg_File_1 :=
12054 Get_File_Name (Bname, Subunit => False);
12055 Error_Msg_N ("\but file{ was not found!", N);
12056 raise Unrecoverable_Error;
12063 -- If loading parent of the generic caused an instantiation circularity,
12064 -- we abandon compilation at this point, because otherwise in some cases
12065 -- we get into trouble with infinite recursions after this point.
12067 if Circularity_Detected then
12068 raise Unrecoverable_Error;
12070 end Load_Parent_Of_Generic;
12072 ---------------------------------
12073 -- Map_Formal_Package_Entities --
12074 ---------------------------------
12076 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
12081 Set_Instance_Of (Form, Act);
12083 -- Traverse formal and actual package to map the corresponding entities.
12084 -- We skip over internal entities that may be generated during semantic
12085 -- analysis, and find the matching entities by name, given that they
12086 -- must appear in the same order.
12088 E1 := First_Entity (Form);
12089 E2 := First_Entity (Act);
12090 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
12091 -- Could this test be a single condition???
12092 -- Seems like it could, and isn't FPE (Form) a constant anyway???
12094 if not Is_Internal (E1)
12095 and then Present (Parent (E1))
12096 and then not Is_Class_Wide_Type (E1)
12097 and then not Is_Internal_Name (Chars (E1))
12099 while Present (E2) and then Chars (E2) /= Chars (E1) loop
12106 Set_Instance_Of (E1, E2);
12108 if Is_Type (E1) and then Is_Tagged_Type (E2) then
12109 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
12112 if Is_Constrained (E1) then
12113 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
12116 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
12117 Map_Formal_Package_Entities (E1, E2);
12124 end Map_Formal_Package_Entities;
12126 -----------------------
12127 -- Move_Freeze_Nodes --
12128 -----------------------
12130 procedure Move_Freeze_Nodes
12131 (Out_Of : Entity_Id;
12136 Next_Decl : Node_Id;
12137 Next_Node : Node_Id := After;
12140 function Is_Outer_Type (T : Entity_Id) return Boolean;
12141 -- Check whether entity is declared in a scope external to that of the
12144 -------------------
12145 -- Is_Outer_Type --
12146 -------------------
12148 function Is_Outer_Type (T : Entity_Id) return Boolean is
12149 Scop : Entity_Id := Scope (T);
12152 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
12156 while Scop /= Standard_Standard loop
12157 if Scop = Out_Of then
12160 Scop := Scope (Scop);
12168 -- Start of processing for Move_Freeze_Nodes
12175 -- First remove the freeze nodes that may appear before all other
12179 while Present (Decl)
12180 and then Nkind (Decl) = N_Freeze_Entity
12181 and then Is_Outer_Type (Entity (Decl))
12183 Decl := Remove_Head (L);
12184 Insert_After (Next_Node, Decl);
12185 Set_Analyzed (Decl, False);
12190 -- Next scan the list of declarations and remove each freeze node that
12191 -- appears ahead of the current node.
12193 while Present (Decl) loop
12194 while Present (Next (Decl))
12195 and then Nkind (Next (Decl)) = N_Freeze_Entity
12196 and then Is_Outer_Type (Entity (Next (Decl)))
12198 Next_Decl := Remove_Next (Decl);
12199 Insert_After (Next_Node, Next_Decl);
12200 Set_Analyzed (Next_Decl, False);
12201 Next_Node := Next_Decl;
12204 -- If the declaration is a nested package or concurrent type, then
12205 -- recurse. Nested generic packages will have been processed from the
12208 case Nkind (Decl) is
12209 when N_Package_Declaration =>
12210 Spec := Specification (Decl);
12212 when N_Task_Type_Declaration =>
12213 Spec := Task_Definition (Decl);
12215 when N_Protected_Type_Declaration =>
12216 Spec := Protected_Definition (Decl);
12222 if Present (Spec) then
12223 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
12224 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
12229 end Move_Freeze_Nodes;
12235 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
12237 return Generic_Renamings.Table (E).Next_In_HTable;
12240 ------------------------
12241 -- Preanalyze_Actuals --
12242 ------------------------
12244 procedure Preanalyze_Actuals (N : Node_Id) is
12247 Errs : constant Int := Serious_Errors_Detected;
12249 Cur : Entity_Id := Empty;
12250 -- Current homograph of the instance name
12253 -- Saved visibility status of the current homograph
12256 Assoc := First (Generic_Associations (N));
12258 -- If the instance is a child unit, its name may hide an outer homonym,
12259 -- so make it invisible to perform name resolution on the actuals.
12261 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
12263 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
12265 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
12267 if Is_Compilation_Unit (Cur) then
12268 Vis := Is_Immediately_Visible (Cur);
12269 Set_Is_Immediately_Visible (Cur, False);
12275 while Present (Assoc) loop
12276 if Nkind (Assoc) /= N_Others_Choice then
12277 Act := Explicit_Generic_Actual_Parameter (Assoc);
12279 -- Within a nested instantiation, a defaulted actual is an empty
12280 -- association, so nothing to analyze. If the subprogram actual
12281 -- is an attribute, analyze prefix only, because actual is not a
12282 -- complete attribute reference.
12284 -- If actual is an allocator, analyze expression only. The full
12285 -- analysis can generate code, and if instance is a compilation
12286 -- unit we have to wait until the package instance is installed
12287 -- to have a proper place to insert this code.
12289 -- String literals may be operators, but at this point we do not
12290 -- know whether the actual is a formal subprogram or a string.
12295 elsif Nkind (Act) = N_Attribute_Reference then
12296 Analyze (Prefix (Act));
12298 elsif Nkind (Act) = N_Explicit_Dereference then
12299 Analyze (Prefix (Act));
12301 elsif Nkind (Act) = N_Allocator then
12303 Expr : constant Node_Id := Expression (Act);
12306 if Nkind (Expr) = N_Subtype_Indication then
12307 Analyze (Subtype_Mark (Expr));
12309 -- Analyze separately each discriminant constraint, when
12310 -- given with a named association.
12316 Constr := First (Constraints (Constraint (Expr)));
12317 while Present (Constr) loop
12318 if Nkind (Constr) = N_Discriminant_Association then
12319 Analyze (Expression (Constr));
12333 elsif Nkind (Act) /= N_Operator_Symbol then
12337 if Errs /= Serious_Errors_Detected then
12339 -- Do a minimal analysis of the generic, to prevent spurious
12340 -- warnings complaining about the generic being unreferenced,
12341 -- before abandoning the instantiation.
12343 Analyze (Name (N));
12345 if Is_Entity_Name (Name (N))
12346 and then Etype (Name (N)) /= Any_Type
12348 Generate_Reference (Entity (Name (N)), Name (N));
12349 Set_Is_Instantiated (Entity (Name (N)));
12352 if Present (Cur) then
12354 -- For the case of a child instance hiding an outer homonym,
12355 -- provide additional warning which might explain the error.
12357 Set_Is_Immediately_Visible (Cur, Vis);
12358 Error_Msg_NE ("& hides outer unit with the same name?",
12359 N, Defining_Unit_Name (N));
12362 Abandon_Instantiation (Act);
12369 if Present (Cur) then
12370 Set_Is_Immediately_Visible (Cur, Vis);
12372 end Preanalyze_Actuals;
12374 -------------------
12375 -- Remove_Parent --
12376 -------------------
12378 procedure Remove_Parent (In_Body : Boolean := False) is
12379 S : Entity_Id := Current_Scope;
12380 -- S is the scope containing the instantiation just completed. The scope
12381 -- stack contains the parent instances of the instantiation, followed by
12390 -- After child instantiation is complete, remove from scope stack the
12391 -- extra copy of the current scope, and then remove parent instances.
12393 if not In_Body then
12396 while Current_Scope /= S loop
12397 P := Current_Scope;
12398 End_Package_Scope (Current_Scope);
12400 if In_Open_Scopes (P) then
12401 E := First_Entity (P);
12402 while Present (E) loop
12403 Set_Is_Immediately_Visible (E, True);
12407 -- If instantiation is declared in a block, it is the enclosing
12408 -- scope that might be a parent instance. Note that only one
12409 -- block can be involved, because the parent instances have
12410 -- been installed within it.
12412 if Ekind (P) = E_Block then
12413 Cur_P := Scope (P);
12418 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
12419 -- We are within an instance of some sibling. Retain
12420 -- visibility of parent, for proper subsequent cleanup, and
12421 -- reinstall private declarations as well.
12423 Set_In_Private_Part (P);
12424 Install_Private_Declarations (P);
12427 -- If the ultimate parent is a top-level unit recorded in
12428 -- Instance_Parent_Unit, then reset its visibility to what it was
12429 -- before instantiation. (It's not clear what the purpose is of
12430 -- testing whether Scope (P) is In_Open_Scopes, but that test was
12431 -- present before the ultimate parent test was added.???)
12433 elsif not In_Open_Scopes (Scope (P))
12434 or else (P = Instance_Parent_Unit
12435 and then not Parent_Unit_Visible)
12437 Set_Is_Immediately_Visible (P, False);
12439 -- If the current scope is itself an instantiation of a generic
12440 -- nested within P, and we are in the private part of body of this
12441 -- instantiation, restore the full views of P, that were removed
12442 -- in End_Package_Scope above. This obscure case can occur when a
12443 -- subunit of a generic contains an instance of a child unit of
12444 -- its generic parent unit.
12446 elsif S = Current_Scope and then Is_Generic_Instance (S) then
12448 Par : constant Entity_Id :=
12450 (Specification (Unit_Declaration_Node (S)));
12453 and then P = Scope (Par)
12454 and then (In_Package_Body (S) or else In_Private_Part (S))
12456 Set_In_Private_Part (P);
12457 Install_Private_Declarations (P);
12463 -- Reset visibility of entities in the enclosing scope
12465 Set_Is_Hidden_Open_Scope (Current_Scope, False);
12467 Hidden := First_Elmt (Hidden_Entities);
12468 while Present (Hidden) loop
12469 Set_Is_Immediately_Visible (Node (Hidden), True);
12470 Next_Elmt (Hidden);
12474 -- Each body is analyzed separately, and there is no context that
12475 -- needs preserving from one body instance to the next, so remove all
12476 -- parent scopes that have been installed.
12478 while Present (S) loop
12479 End_Package_Scope (S);
12480 Set_Is_Immediately_Visible (S, False);
12481 S := Current_Scope;
12482 exit when S = Standard_Standard;
12491 procedure Restore_Env is
12492 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
12495 if No (Current_Instantiated_Parent.Act_Id) then
12496 -- Restore environment after subprogram inlining
12498 Restore_Private_Views (Empty);
12501 Current_Instantiated_Parent := Saved.Instantiated_Parent;
12502 Exchanged_Views := Saved.Exchanged_Views;
12503 Hidden_Entities := Saved.Hidden_Entities;
12504 Current_Sem_Unit := Saved.Current_Sem_Unit;
12505 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
12506 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
12508 Restore_Opt_Config_Switches (Saved.Switches);
12510 Instance_Envs.Decrement_Last;
12513 ---------------------------
12514 -- Restore_Private_Views --
12515 ---------------------------
12517 procedure Restore_Private_Views
12518 (Pack_Id : Entity_Id;
12519 Is_Package : Boolean := True)
12524 Dep_Elmt : Elmt_Id;
12527 procedure Restore_Nested_Formal (Formal : Entity_Id);
12528 -- Hide the generic formals of formal packages declared with box which
12529 -- were reachable in the current instantiation.
12531 ---------------------------
12532 -- Restore_Nested_Formal --
12533 ---------------------------
12535 procedure Restore_Nested_Formal (Formal : Entity_Id) is
12539 if Present (Renamed_Object (Formal))
12540 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
12544 elsif Present (Associated_Formal_Package (Formal)) then
12545 Ent := First_Entity (Formal);
12546 while Present (Ent) loop
12547 exit when Ekind (Ent) = E_Package
12548 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
12550 Set_Is_Hidden (Ent);
12551 Set_Is_Potentially_Use_Visible (Ent, False);
12553 -- If package, then recurse
12555 if Ekind (Ent) = E_Package then
12556 Restore_Nested_Formal (Ent);
12562 end Restore_Nested_Formal;
12564 -- Start of processing for Restore_Private_Views
12567 M := First_Elmt (Exchanged_Views);
12568 while Present (M) loop
12571 -- Subtypes of types whose views have been exchanged, and that are
12572 -- defined within the instance, were not on the Private_Dependents
12573 -- list on entry to the instance, so they have to be exchanged
12574 -- explicitly now, in order to remain consistent with the view of the
12577 if Ekind_In (Typ, E_Private_Type,
12578 E_Limited_Private_Type,
12579 E_Record_Type_With_Private)
12581 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
12582 while Present (Dep_Elmt) loop
12583 Dep_Typ := Node (Dep_Elmt);
12585 if Scope (Dep_Typ) = Pack_Id
12586 and then Present (Full_View (Dep_Typ))
12588 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
12589 Exchange_Declarations (Dep_Typ);
12592 Next_Elmt (Dep_Elmt);
12596 Exchange_Declarations (Node (M));
12600 if No (Pack_Id) then
12604 -- Make the generic formal parameters private, and make the formal types
12605 -- into subtypes of the actuals again.
12607 E := First_Entity (Pack_Id);
12608 while Present (E) loop
12609 Set_Is_Hidden (E, True);
12612 and then Nkind (Parent (E)) = N_Subtype_Declaration
12614 Set_Is_Generic_Actual_Type (E, False);
12616 -- An unusual case of aliasing: the actual may also be directly
12617 -- visible in the generic, and be private there, while it is fully
12618 -- visible in the context of the instance. The internal subtype
12619 -- is private in the instance but has full visibility like its
12620 -- parent in the enclosing scope. This enforces the invariant that
12621 -- the privacy status of all private dependents of a type coincide
12622 -- with that of the parent type. This can only happen when a
12623 -- generic child unit is instantiated within a sibling.
12625 if Is_Private_Type (E)
12626 and then not Is_Private_Type (Etype (E))
12628 Exchange_Declarations (E);
12631 elsif Ekind (E) = E_Package then
12633 -- The end of the renaming list is the renaming of the generic
12634 -- package itself. If the instance is a subprogram, all entities
12635 -- in the corresponding package are renamings. If this entity is
12636 -- a formal package, make its own formals private as well. The
12637 -- actual in this case is itself the renaming of an instantiation.
12638 -- If the entity is not a package renaming, it is the entity
12639 -- created to validate formal package actuals: ignore it.
12641 -- If the actual is itself a formal package for the enclosing
12642 -- generic, or the actual for such a formal package, it remains
12643 -- visible on exit from the instance, and therefore nothing needs
12644 -- to be done either, except to keep it accessible.
12646 if Is_Package and then Renamed_Object (E) = Pack_Id then
12649 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
12653 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
12655 Set_Is_Hidden (E, False);
12659 Act_P : constant Entity_Id := Renamed_Object (E);
12663 Id := First_Entity (Act_P);
12665 and then Id /= First_Private_Entity (Act_P)
12667 exit when Ekind (Id) = E_Package
12668 and then Renamed_Object (Id) = Act_P;
12670 Set_Is_Hidden (Id, True);
12671 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
12673 if Ekind (Id) = E_Package then
12674 Restore_Nested_Formal (Id);
12685 end Restore_Private_Views;
12692 (Gen_Unit : Entity_Id;
12693 Act_Unit : Entity_Id)
12697 Set_Instance_Env (Gen_Unit, Act_Unit);
12700 ----------------------------
12701 -- Save_Global_References --
12702 ----------------------------
12704 procedure Save_Global_References (N : Node_Id) is
12705 Gen_Scope : Entity_Id;
12709 function Is_Global (E : Entity_Id) return Boolean;
12710 -- Check whether entity is defined outside of generic unit. Examine the
12711 -- scope of an entity, and the scope of the scope, etc, until we find
12712 -- either Standard, in which case the entity is global, or the generic
12713 -- unit itself, which indicates that the entity is local. If the entity
12714 -- is the generic unit itself, as in the case of a recursive call, or
12715 -- the enclosing generic unit, if different from the current scope, then
12716 -- it is local as well, because it will be replaced at the point of
12717 -- instantiation. On the other hand, if it is a reference to a child
12718 -- unit of a common ancestor, which appears in an instantiation, it is
12719 -- global because it is used to denote a specific compilation unit at
12720 -- the time the instantiations will be analyzed.
12722 procedure Reset_Entity (N : Node_Id);
12723 -- Save semantic information on global entity so that it is not resolved
12724 -- again at instantiation time.
12726 procedure Save_Entity_Descendants (N : Node_Id);
12727 -- Apply Save_Global_References to the two syntactic descendants of
12728 -- non-terminal nodes that carry an Associated_Node and are processed
12729 -- through Reset_Entity. Once the global entity (if any) has been
12730 -- captured together with its type, only two syntactic descendants need
12731 -- to be traversed to complete the processing of the tree rooted at N.
12732 -- This applies to Selected_Components, Expanded_Names, and to Operator
12733 -- nodes. N can also be a character literal, identifier, or operator
12734 -- symbol node, but the call has no effect in these cases.
12736 procedure Save_Global_Defaults (N1, N2 : Node_Id);
12737 -- Default actuals in nested instances must be handled specially
12738 -- because there is no link to them from the original tree. When an
12739 -- actual subprogram is given by a default, we add an explicit generic
12740 -- association for it in the instantiation node. When we save the
12741 -- global references on the name of the instance, we recover the list
12742 -- of generic associations, and add an explicit one to the original
12743 -- generic tree, through which a global actual can be preserved.
12744 -- Similarly, if a child unit is instantiated within a sibling, in the
12745 -- context of the parent, we must preserve the identifier of the parent
12746 -- so that it can be properly resolved in a subsequent instantiation.
12748 procedure Save_Global_Descendant (D : Union_Id);
12749 -- Apply Save_Global_References recursively to the descendents of the
12752 procedure Save_References (N : Node_Id);
12753 -- This is the recursive procedure that does the work, once the
12754 -- enclosing generic scope has been established.
12760 function Is_Global (E : Entity_Id) return Boolean is
12763 function Is_Instance_Node (Decl : Node_Id) return Boolean;
12764 -- Determine whether the parent node of a reference to a child unit
12765 -- denotes an instantiation or a formal package, in which case the
12766 -- reference to the child unit is global, even if it appears within
12767 -- the current scope (e.g. when the instance appears within the body
12768 -- of an ancestor).
12770 ----------------------
12771 -- Is_Instance_Node --
12772 ----------------------
12774 function Is_Instance_Node (Decl : Node_Id) return Boolean is
12776 return Nkind (Decl) in N_Generic_Instantiation
12778 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
12779 end Is_Instance_Node;
12781 -- Start of processing for Is_Global
12784 if E = Gen_Scope then
12787 elsif E = Standard_Standard then
12790 elsif Is_Child_Unit (E)
12791 and then (Is_Instance_Node (Parent (N2))
12792 or else (Nkind (Parent (N2)) = N_Expanded_Name
12793 and then N2 = Selector_Name (Parent (N2))
12795 Is_Instance_Node (Parent (Parent (N2)))))
12801 while Se /= Gen_Scope loop
12802 if Se = Standard_Standard then
12817 procedure Reset_Entity (N : Node_Id) is
12819 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
12820 -- If the type of N2 is global to the generic unit, save the type in
12821 -- the generic node. Just as we perform name capture for explicit
12822 -- references within the generic, we must capture the global types
12823 -- of local entities because they may participate in resolution in
12826 function Top_Ancestor (E : Entity_Id) return Entity_Id;
12827 -- Find the ultimate ancestor of the current unit. If it is not a
12828 -- generic unit, then the name of the current unit in the prefix of
12829 -- an expanded name must be replaced with its generic homonym to
12830 -- ensure that it will be properly resolved in an instance.
12832 ---------------------
12833 -- Set_Global_Type --
12834 ---------------------
12836 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
12837 Typ : constant Entity_Id := Etype (N2);
12840 Set_Etype (N, Typ);
12842 if Entity (N) /= N2
12843 and then Has_Private_View (Entity (N))
12845 -- If the entity of N is not the associated node, this is a
12846 -- nested generic and it has an associated node as well, whose
12847 -- type is already the full view (see below). Indicate that the
12848 -- original node has a private view.
12850 Set_Has_Private_View (N);
12853 -- If not a private type, nothing else to do
12855 if not Is_Private_Type (Typ) then
12856 if Is_Array_Type (Typ)
12857 and then Is_Private_Type (Component_Type (Typ))
12859 Set_Has_Private_View (N);
12862 -- If it is a derivation of a private type in a context where no
12863 -- full view is needed, nothing to do either.
12865 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
12868 -- Otherwise mark the type for flipping and use the full view when
12872 Set_Has_Private_View (N);
12874 if Present (Full_View (Typ)) then
12875 Set_Etype (N2, Full_View (Typ));
12878 end Set_Global_Type;
12884 function Top_Ancestor (E : Entity_Id) return Entity_Id is
12889 while Is_Child_Unit (Par) loop
12890 Par := Scope (Par);
12896 -- Start of processing for Reset_Entity
12899 N2 := Get_Associated_Node (N);
12902 if Present (E) then
12904 -- If the node is an entry call to an entry in an enclosing task,
12905 -- it is rewritten as a selected component. No global entity to
12906 -- preserve in this case, since the expansion will be redone in
12909 if not Nkind_In (E, N_Defining_Identifier,
12910 N_Defining_Character_Literal,
12911 N_Defining_Operator_Symbol)
12913 Set_Associated_Node (N, Empty);
12914 Set_Etype (N, Empty);
12918 -- If the entity is an itype created as a subtype of an access
12919 -- type with a null exclusion restore source entity for proper
12920 -- visibility. The itype will be created anew in the instance.
12923 and then Ekind (E) = E_Access_Subtype
12924 and then Is_Entity_Name (N)
12925 and then Chars (Etype (E)) = Chars (N)
12928 Set_Entity (N2, E);
12932 if Is_Global (E) then
12933 Set_Global_Type (N, N2);
12935 elsif Nkind (N) = N_Op_Concat
12936 and then Is_Generic_Type (Etype (N2))
12937 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
12939 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
12940 and then Is_Intrinsic_Subprogram (E)
12945 -- Entity is local. Mark generic node as unresolved.
12946 -- Note that now it does not have an entity.
12948 Set_Associated_Node (N, Empty);
12949 Set_Etype (N, Empty);
12952 if Nkind (Parent (N)) in N_Generic_Instantiation
12953 and then N = Name (Parent (N))
12955 Save_Global_Defaults (Parent (N), Parent (N2));
12958 elsif Nkind (Parent (N)) = N_Selected_Component
12959 and then Nkind (Parent (N2)) = N_Expanded_Name
12961 if Is_Global (Entity (Parent (N2))) then
12962 Change_Selected_Component_To_Expanded_Name (Parent (N));
12963 Set_Associated_Node (Parent (N), Parent (N2));
12964 Set_Global_Type (Parent (N), Parent (N2));
12965 Save_Entity_Descendants (N);
12967 -- If this is a reference to the current generic entity, replace
12968 -- by the name of the generic homonym of the current package. This
12969 -- is because in an instantiation Par.P.Q will not resolve to the
12970 -- name of the instance, whose enclosing scope is not necessarily
12971 -- Par. We use the generic homonym rather that the name of the
12972 -- generic itself because it may be hidden by a local declaration.
12974 elsif In_Open_Scopes (Entity (Parent (N2)))
12976 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
12978 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
12979 Rewrite (Parent (N),
12980 Make_Identifier (Sloc (N),
12982 Chars (Generic_Homonym (Entity (Parent (N2))))));
12984 Rewrite (Parent (N),
12985 Make_Identifier (Sloc (N),
12986 Chars => Chars (Selector_Name (Parent (N2)))));
12990 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
12991 and then Parent (N) = Name (Parent (Parent (N)))
12993 Save_Global_Defaults
12994 (Parent (Parent (N)), Parent (Parent ((N2))));
12997 -- A selected component may denote a static constant that has been
12998 -- folded. If the static constant is global to the generic, capture
12999 -- its value. Otherwise the folding will happen in any instantiation.
13001 elsif Nkind (Parent (N)) = N_Selected_Component
13002 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
13004 if Present (Entity (Original_Node (Parent (N2))))
13005 and then Is_Global (Entity (Original_Node (Parent (N2))))
13007 Rewrite (Parent (N), New_Copy (Parent (N2)));
13008 Set_Analyzed (Parent (N), False);
13014 -- A selected component may be transformed into a parameterless
13015 -- function call. If the called entity is global, rewrite the node
13016 -- appropriately, i.e. as an extended name for the global entity.
13018 elsif Nkind (Parent (N)) = N_Selected_Component
13019 and then Nkind (Parent (N2)) = N_Function_Call
13020 and then N = Selector_Name (Parent (N))
13022 if No (Parameter_Associations (Parent (N2))) then
13023 if Is_Global (Entity (Name (Parent (N2)))) then
13024 Change_Selected_Component_To_Expanded_Name (Parent (N));
13025 Set_Associated_Node (Parent (N), Name (Parent (N2)));
13026 Set_Global_Type (Parent (N), Name (Parent (N2)));
13027 Save_Entity_Descendants (N);
13030 Set_Is_Prefixed_Call (Parent (N));
13031 Set_Associated_Node (N, Empty);
13032 Set_Etype (N, Empty);
13035 -- In Ada 2005, X.F may be a call to a primitive operation,
13036 -- rewritten as F (X). This rewriting will be done again in an
13037 -- instance, so keep the original node. Global entities will be
13038 -- captured as for other constructs. Indicate that this must
13039 -- resolve as a call, to prevent accidental overloading in the
13040 -- instance, if both a component and a primitive operation appear
13044 Set_Is_Prefixed_Call (Parent (N));
13047 -- Entity is local. Reset in generic unit, so that node is resolved
13048 -- anew at the point of instantiation.
13051 Set_Associated_Node (N, Empty);
13052 Set_Etype (N, Empty);
13056 -----------------------------
13057 -- Save_Entity_Descendants --
13058 -----------------------------
13060 procedure Save_Entity_Descendants (N : Node_Id) is
13063 when N_Binary_Op =>
13064 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
13065 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13068 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13070 when N_Expanded_Name | N_Selected_Component =>
13071 Save_Global_Descendant (Union_Id (Prefix (N)));
13072 Save_Global_Descendant (Union_Id (Selector_Name (N)));
13074 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
13078 raise Program_Error;
13080 end Save_Entity_Descendants;
13082 --------------------------
13083 -- Save_Global_Defaults --
13084 --------------------------
13086 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
13087 Loc : constant Source_Ptr := Sloc (N1);
13088 Assoc2 : constant List_Id := Generic_Associations (N2);
13089 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
13096 Actual : Entity_Id;
13099 Assoc1 := Generic_Associations (N1);
13101 if Present (Assoc1) then
13102 Act1 := First (Assoc1);
13105 Set_Generic_Associations (N1, New_List);
13106 Assoc1 := Generic_Associations (N1);
13109 if Present (Assoc2) then
13110 Act2 := First (Assoc2);
13115 while Present (Act1) and then Present (Act2) loop
13120 -- Find the associations added for default subprograms
13122 if Present (Act2) then
13123 while Nkind (Act2) /= N_Generic_Association
13124 or else No (Entity (Selector_Name (Act2)))
13125 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
13130 -- Add a similar association if the default is global. The
13131 -- renaming declaration for the actual has been analyzed, and
13132 -- its alias is the program it renames. Link the actual in the
13133 -- original generic tree with the node in the analyzed tree.
13135 while Present (Act2) loop
13136 Subp := Entity (Selector_Name (Act2));
13137 Def := Explicit_Generic_Actual_Parameter (Act2);
13139 -- Following test is defence against rubbish errors
13141 if No (Alias (Subp)) then
13145 -- Retrieve the resolved actual from the renaming declaration
13146 -- created for the instantiated formal.
13148 Actual := Entity (Name (Parent (Parent (Subp))));
13149 Set_Entity (Def, Actual);
13150 Set_Etype (Def, Etype (Actual));
13152 if Is_Global (Actual) then
13154 Make_Generic_Association (Loc,
13155 Selector_Name => New_Occurrence_Of (Subp, Loc),
13156 Explicit_Generic_Actual_Parameter =>
13157 New_Occurrence_Of (Actual, Loc));
13159 Set_Associated_Node
13160 (Explicit_Generic_Actual_Parameter (Ndec), Def);
13162 Append (Ndec, Assoc1);
13164 -- If there are other defaults, add a dummy association in case
13165 -- there are other defaulted formals with the same name.
13167 elsif Present (Next (Act2)) then
13169 Make_Generic_Association (Loc,
13170 Selector_Name => New_Occurrence_Of (Subp, Loc),
13171 Explicit_Generic_Actual_Parameter => Empty);
13173 Append (Ndec, Assoc1);
13180 if Nkind (Name (N1)) = N_Identifier
13181 and then Is_Child_Unit (Gen_Id)
13182 and then Is_Global (Gen_Id)
13183 and then Is_Generic_Unit (Scope (Gen_Id))
13184 and then In_Open_Scopes (Scope (Gen_Id))
13186 -- This is an instantiation of a child unit within a sibling, so
13187 -- that the generic parent is in scope. An eventual instance must
13188 -- occur within the scope of an instance of the parent. Make name
13189 -- in instance into an expanded name, to preserve the identifier
13190 -- of the parent, so it can be resolved subsequently.
13192 Rewrite (Name (N2),
13193 Make_Expanded_Name (Loc,
13194 Chars => Chars (Gen_Id),
13195 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13196 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13197 Set_Entity (Name (N2), Gen_Id);
13199 Rewrite (Name (N1),
13200 Make_Expanded_Name (Loc,
13201 Chars => Chars (Gen_Id),
13202 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13203 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13205 Set_Associated_Node (Name (N1), Name (N2));
13206 Set_Associated_Node (Prefix (Name (N1)), Empty);
13207 Set_Associated_Node
13208 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
13209 Set_Etype (Name (N1), Etype (Gen_Id));
13212 end Save_Global_Defaults;
13214 ----------------------------
13215 -- Save_Global_Descendant --
13216 ----------------------------
13218 procedure Save_Global_Descendant (D : Union_Id) is
13222 if D in Node_Range then
13223 if D = Union_Id (Empty) then
13226 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
13227 Save_References (Node_Id (D));
13230 elsif D in List_Range then
13231 if D = Union_Id (No_List)
13232 or else Is_Empty_List (List_Id (D))
13237 N1 := First (List_Id (D));
13238 while Present (N1) loop
13239 Save_References (N1);
13244 -- Element list or other non-node field, nothing to do
13249 end Save_Global_Descendant;
13251 ---------------------
13252 -- Save_References --
13253 ---------------------
13255 -- This is the recursive procedure that does the work once the enclosing
13256 -- generic scope has been established. We have to treat specially a
13257 -- number of node rewritings that are required by semantic processing
13258 -- and which change the kind of nodes in the generic copy: typically
13259 -- constant-folding, replacing an operator node by a string literal, or
13260 -- a selected component by an expanded name. In each of those cases, the
13261 -- transformation is propagated to the generic unit.
13263 procedure Save_References (N : Node_Id) is
13264 Loc : constant Source_Ptr := Sloc (N);
13270 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
13271 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13274 elsif Nkind (N) = N_Operator_Symbol
13275 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
13277 Change_Operator_Symbol_To_String_Literal (N);
13280 elsif Nkind (N) in N_Op then
13281 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13282 if Nkind (N) = N_Op_Concat then
13283 Set_Is_Component_Left_Opnd (N,
13284 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13286 Set_Is_Component_Right_Opnd (N,
13287 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13293 -- Node may be transformed into call to a user-defined operator
13295 N2 := Get_Associated_Node (N);
13297 if Nkind (N2) = N_Function_Call then
13298 E := Entity (Name (N2));
13301 and then Is_Global (E)
13303 Set_Etype (N, Etype (N2));
13305 Set_Associated_Node (N, Empty);
13306 Set_Etype (N, Empty);
13309 elsif Nkind_In (N2, N_Integer_Literal,
13313 if Present (Original_Node (N2))
13314 and then Nkind (Original_Node (N2)) = Nkind (N)
13317 -- Operation was constant-folded. Whenever possible,
13318 -- recover semantic information from unfolded node,
13321 Set_Associated_Node (N, Original_Node (N2));
13323 if Nkind (N) = N_Op_Concat then
13324 Set_Is_Component_Left_Opnd (N,
13325 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13326 Set_Is_Component_Right_Opnd (N,
13327 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13333 -- If original node is already modified, propagate
13334 -- constant-folding to template.
13336 Rewrite (N, New_Copy (N2));
13337 Set_Analyzed (N, False);
13340 elsif Nkind (N2) = N_Identifier
13341 and then Ekind (Entity (N2)) = E_Enumeration_Literal
13343 -- Same if call was folded into a literal, but in this case
13344 -- retain the entity to avoid spurious ambiguities if it is
13345 -- overloaded at the point of instantiation or inlining.
13347 Rewrite (N, New_Copy (N2));
13348 Set_Analyzed (N, False);
13352 -- Complete operands check if node has not been constant-folded
13354 if Nkind (N) in N_Op then
13355 Save_Entity_Descendants (N);
13358 elsif Nkind (N) = N_Identifier then
13359 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13361 -- If this is a discriminant reference, always save it. It is
13362 -- used in the instance to find the corresponding discriminant
13363 -- positionally rather than by name.
13365 Set_Original_Discriminant
13366 (N, Original_Discriminant (Get_Associated_Node (N)));
13370 N2 := Get_Associated_Node (N);
13372 if Nkind (N2) = N_Function_Call then
13373 E := Entity (Name (N2));
13375 -- Name resolves to a call to parameterless function. If
13376 -- original entity is global, mark node as resolved.
13379 and then Is_Global (E)
13381 Set_Etype (N, Etype (N2));
13383 Set_Associated_Node (N, Empty);
13384 Set_Etype (N, Empty);
13387 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
13388 and then Is_Entity_Name (Original_Node (N2))
13390 -- Name resolves to named number that is constant-folded,
13391 -- We must preserve the original name for ASIS use, and
13392 -- undo the constant-folding, which will be repeated in
13395 Set_Associated_Node (N, Original_Node (N2));
13398 elsif Nkind (N2) = N_String_Literal then
13400 -- Name resolves to string literal. Perform the same
13401 -- replacement in generic.
13403 Rewrite (N, New_Copy (N2));
13405 elsif Nkind (N2) = N_Explicit_Dereference then
13407 -- An identifier is rewritten as a dereference if it is the
13408 -- prefix in an implicit dereference (call or attribute).
13409 -- The analysis of an instantiation will expand the node
13410 -- again, so we preserve the original tree but link it to
13411 -- the resolved entity in case it is global.
13413 if Is_Entity_Name (Prefix (N2))
13414 and then Present (Entity (Prefix (N2)))
13415 and then Is_Global (Entity (Prefix (N2)))
13417 Set_Associated_Node (N, Prefix (N2));
13419 elsif Nkind (Prefix (N2)) = N_Function_Call
13420 and then Is_Global (Entity (Name (Prefix (N2))))
13423 Make_Explicit_Dereference (Loc,
13424 Prefix => Make_Function_Call (Loc,
13426 New_Occurrence_Of (Entity (Name (Prefix (N2))),
13430 Set_Associated_Node (N, Empty);
13431 Set_Etype (N, Empty);
13434 -- The subtype mark of a nominally unconstrained object is
13435 -- rewritten as a subtype indication using the bounds of the
13436 -- expression. Recover the original subtype mark.
13438 elsif Nkind (N2) = N_Subtype_Indication
13439 and then Is_Entity_Name (Original_Node (N2))
13441 Set_Associated_Node (N, Original_Node (N2));
13449 elsif Nkind (N) in N_Entity then
13454 Qual : Node_Id := Empty;
13455 Typ : Entity_Id := Empty;
13458 use Atree.Unchecked_Access;
13459 -- This code section is part of implementing an untyped tree
13460 -- traversal, so it needs direct access to node fields.
13463 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
13464 N2 := Get_Associated_Node (N);
13471 -- In an instance within a generic, use the name of the
13472 -- actual and not the original generic parameter. If the
13473 -- actual is global in the current generic it must be
13474 -- preserved for its instantiation.
13476 if Nkind (Parent (Typ)) = N_Subtype_Declaration
13478 Present (Generic_Parent_Type (Parent (Typ)))
13480 Typ := Base_Type (Typ);
13481 Set_Etype (N2, Typ);
13487 or else not Is_Global (Typ)
13489 Set_Associated_Node (N, Empty);
13491 -- If the aggregate is an actual in a call, it has been
13492 -- resolved in the current context, to some local type.
13493 -- The enclosing call may have been disambiguated by the
13494 -- aggregate, and this disambiguation might fail at
13495 -- instantiation time because the type to which the
13496 -- aggregate did resolve is not preserved. In order to
13497 -- preserve some of this information, we wrap the
13498 -- aggregate in a qualified expression, using the id of
13499 -- its type. For further disambiguation we qualify the
13500 -- type name with its scope (if visible) because both
13501 -- id's will have corresponding entities in an instance.
13502 -- This resolves most of the problems with missing type
13503 -- information on aggregates in instances.
13505 if Nkind (N2) = Nkind (N)
13507 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
13509 and then Comes_From_Source (Typ)
13511 if Is_Immediately_Visible (Scope (Typ)) then
13512 Nam := Make_Selected_Component (Loc,
13514 Make_Identifier (Loc, Chars (Scope (Typ))),
13516 Make_Identifier (Loc, Chars (Typ)));
13518 Nam := Make_Identifier (Loc, Chars (Typ));
13522 Make_Qualified_Expression (Loc,
13523 Subtype_Mark => Nam,
13524 Expression => Relocate_Node (N));
13528 Save_Global_Descendant (Field1 (N));
13529 Save_Global_Descendant (Field2 (N));
13530 Save_Global_Descendant (Field3 (N));
13531 Save_Global_Descendant (Field5 (N));
13533 if Present (Qual) then
13537 -- All other cases than aggregates
13540 Save_Global_Descendant (Field1 (N));
13541 Save_Global_Descendant (Field2 (N));
13542 Save_Global_Descendant (Field3 (N));
13543 Save_Global_Descendant (Field4 (N));
13544 Save_Global_Descendant (Field5 (N));
13549 -- If a node has aspects, references within their expressions must
13550 -- be saved separately, given that they are not directly in the
13553 if Has_Aspects (N) then
13557 Aspect := First (Aspect_Specifications (N));
13558 while Present (Aspect) loop
13559 Save_Global_References (Expression (Aspect));
13564 end Save_References;
13566 -- Start of processing for Save_Global_References
13569 Gen_Scope := Current_Scope;
13571 -- If the generic unit is a child unit, references to entities in the
13572 -- parent are treated as local, because they will be resolved anew in
13573 -- the context of the instance of the parent.
13575 while Is_Child_Unit (Gen_Scope)
13576 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
13578 Gen_Scope := Scope (Gen_Scope);
13581 Save_References (N);
13582 end Save_Global_References;
13584 --------------------------------------
13585 -- Set_Copied_Sloc_For_Inlined_Body --
13586 --------------------------------------
13588 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
13590 Create_Instantiation_Source (N, E, True, S_Adjustment);
13591 end Set_Copied_Sloc_For_Inlined_Body;
13593 ---------------------
13594 -- Set_Instance_Of --
13595 ---------------------
13597 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
13599 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
13600 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
13601 Generic_Renamings.Increment_Last;
13602 end Set_Instance_Of;
13604 --------------------
13605 -- Set_Next_Assoc --
13606 --------------------
13608 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
13610 Generic_Renamings.Table (E).Next_In_HTable := Next;
13611 end Set_Next_Assoc;
13613 -------------------
13614 -- Start_Generic --
13615 -------------------
13617 procedure Start_Generic is
13619 -- ??? More things could be factored out in this routine.
13620 -- Should probably be done at a later stage.
13622 Generic_Flags.Append (Inside_A_Generic);
13623 Inside_A_Generic := True;
13625 Expander_Mode_Save_And_Set (False);
13628 ----------------------
13629 -- Set_Instance_Env --
13630 ----------------------
13632 procedure Set_Instance_Env
13633 (Gen_Unit : Entity_Id;
13634 Act_Unit : Entity_Id)
13637 -- Regardless of the current mode, predefined units are analyzed in the
13638 -- most current Ada mode, and earlier version Ada checks do not apply
13639 -- to predefined units. Nothing needs to be done for non-internal units.
13640 -- These are always analyzed in the current mode.
13642 if Is_Internal_File_Name
13643 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
13644 Renamings_Included => True)
13646 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
13649 Current_Instantiated_Parent :=
13650 (Gen_Id => Gen_Unit,
13651 Act_Id => Act_Unit,
13652 Next_In_HTable => Assoc_Null);
13653 end Set_Instance_Env;
13659 procedure Switch_View (T : Entity_Id) is
13660 BT : constant Entity_Id := Base_Type (T);
13661 Priv_Elmt : Elmt_Id := No_Elmt;
13662 Priv_Sub : Entity_Id;
13665 -- T may be private but its base type may have been exchanged through
13666 -- some other occurrence, in which case there is nothing to switch
13667 -- besides T itself. Note that a private dependent subtype of a private
13668 -- type might not have been switched even if the base type has been,
13669 -- because of the last branch of Check_Private_View (see comment there).
13671 if not Is_Private_Type (BT) then
13672 Prepend_Elmt (Full_View (T), Exchanged_Views);
13673 Exchange_Declarations (T);
13677 Priv_Elmt := First_Elmt (Private_Dependents (BT));
13679 if Present (Full_View (BT)) then
13680 Prepend_Elmt (Full_View (BT), Exchanged_Views);
13681 Exchange_Declarations (BT);
13684 while Present (Priv_Elmt) loop
13685 Priv_Sub := (Node (Priv_Elmt));
13687 -- We avoid flipping the subtype if the Etype of its full view is
13688 -- private because this would result in a malformed subtype. This
13689 -- occurs when the Etype of the subtype full view is the full view of
13690 -- the base type (and since the base types were just switched, the
13691 -- subtype is pointing to the wrong view). This is currently the case
13692 -- for tagged record types, access types (maybe more?) and needs to
13693 -- be resolved. ???
13695 if Present (Full_View (Priv_Sub))
13696 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
13698 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
13699 Exchange_Declarations (Priv_Sub);
13702 Next_Elmt (Priv_Elmt);
13710 function True_Parent (N : Node_Id) return Node_Id is
13712 if Nkind (Parent (N)) = N_Subunit then
13713 return Parent (Corresponding_Stub (Parent (N)));
13719 -----------------------------
13720 -- Valid_Default_Attribute --
13721 -----------------------------
13723 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
13724 Attr_Id : constant Attribute_Id :=
13725 Get_Attribute_Id (Attribute_Name (Def));
13726 T : constant Entity_Id := Entity (Prefix (Def));
13727 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
13740 F := First_Formal (Nam);
13741 while Present (F) loop
13742 Num_F := Num_F + 1;
13747 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
13748 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
13749 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
13750 Attribute_Unbiased_Rounding =>
13753 and then Is_Floating_Point_Type (T);
13755 when Attribute_Image | Attribute_Pred | Attribute_Succ |
13756 Attribute_Value | Attribute_Wide_Image |
13757 Attribute_Wide_Value =>
13758 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
13760 when Attribute_Max | Attribute_Min =>
13761 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
13763 when Attribute_Input =>
13764 OK := (Is_Fun and then Num_F = 1);
13766 when Attribute_Output | Attribute_Read | Attribute_Write =>
13767 OK := (not Is_Fun and then Num_F = 2);
13774 Error_Msg_N ("attribute reference has wrong profile for subprogram",
13777 end Valid_Default_Attribute;