1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, 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;
79 with Warnsw; use Warnsw;
83 package body Sem_Ch12 is
85 ----------------------------------------------------------
86 -- Implementation of Generic Analysis and Instantiation --
87 ----------------------------------------------------------
89 -- GNAT implements generics by macro expansion. No attempt is made to share
90 -- generic instantiations (for now). Analysis of a generic definition does
91 -- not perform any expansion action, but the expander must be called on the
92 -- tree for each instantiation, because the expansion may of course depend
93 -- on the generic actuals. All of this is best achieved as follows:
95 -- a) Semantic analysis of a generic unit is performed on a copy of the
96 -- tree for the generic unit. All tree modifications that follow analysis
97 -- do not affect the original tree. Links are kept between the original
98 -- tree and the copy, in order to recognize non-local references within
99 -- the generic, and propagate them to each instance (recall that name
100 -- resolution is done on the generic declaration: generics are not really
101 -- macros). This is summarized in the following diagram:
103 -- .-----------. .----------.
104 -- | semantic |<--------------| generic |
106 -- | |==============>| |
107 -- |___________| global |__________|
118 -- b) Each instantiation copies the original tree, and inserts into it a
119 -- series of declarations that describe the mapping between generic formals
120 -- and actuals. For example, a generic In OUT parameter is an object
121 -- renaming of the corresponding actual, etc. Generic IN parameters are
122 -- constant declarations.
124 -- c) In order to give the right visibility for these renamings, we use
125 -- a different scheme for package and subprogram instantiations. For
126 -- packages, the list of renamings is inserted into the package
127 -- specification, before the visible declarations of the package. The
128 -- renamings are analyzed before any of the text of the instance, and are
129 -- thus visible at the right place. Furthermore, outside of the instance,
130 -- the generic parameters are visible and denote their corresponding
133 -- For subprograms, we create a container package to hold the renamings
134 -- and the subprogram instance itself. Analysis of the package makes the
135 -- renaming declarations visible to the subprogram. After analyzing the
136 -- package, the defining entity for the subprogram is touched-up so that
137 -- it appears declared in the current scope, and not inside the container
140 -- If the instantiation is a compilation unit, the container package is
141 -- given the same name as the subprogram instance. This ensures that
142 -- the elaboration procedure called by the binder, using the compilation
143 -- unit name, calls in fact the elaboration procedure for the package.
145 -- Not surprisingly, private types complicate this approach. By saving in
146 -- the original generic object the non-local references, we guarantee that
147 -- the proper entities are referenced at the point of instantiation.
148 -- However, for private types, this by itself does not insure that the
149 -- proper VIEW of the entity is used (the full type may be visible at the
150 -- point of generic definition, but not at instantiation, or vice-versa).
151 -- In order to reference the proper view, we special-case any reference
152 -- to private types in the generic object, by saving both views, one in
153 -- the generic and one in the semantic copy. At time of instantiation, we
154 -- check whether the two views are consistent, and exchange declarations if
155 -- necessary, in order to restore the correct visibility. Similarly, if
156 -- the instance view is private when the generic view was not, we perform
157 -- the exchange. After completing the instantiation, we restore the
158 -- current visibility. The flag Has_Private_View marks identifiers in the
159 -- the generic unit that require checking.
161 -- Visibility within nested generic units requires special handling.
162 -- Consider the following scheme:
164 -- type Global is ... -- outside of generic unit.
168 -- type Semi_Global is ... -- global to inner.
171 -- procedure inner (X1 : Global; X2 : Semi_Global);
173 -- procedure in2 is new inner (...); -- 4
176 -- package New_Outer is new Outer (...); -- 2
177 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
179 -- The semantic analysis of Outer captures all occurrences of Global.
180 -- The semantic analysis of Inner (at 1) captures both occurrences of
181 -- Global and Semi_Global.
183 -- At point 2 (instantiation of Outer), we also produce a generic copy
184 -- of Inner, even though Inner is, at that point, not being instantiated.
185 -- (This is just part of the semantic analysis of New_Outer).
187 -- Critically, references to Global within Inner must be preserved, while
188 -- references to Semi_Global should not preserved, because they must now
189 -- resolve to an entity within New_Outer. To distinguish between these, we
190 -- use a global variable, Current_Instantiated_Parent, which is set when
191 -- performing a generic copy during instantiation (at 2). This variable is
192 -- used when performing a generic copy that is not an instantiation, but
193 -- that is nested within one, as the occurrence of 1 within 2. The analysis
194 -- of a nested generic only preserves references that are global to the
195 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
196 -- determine whether a reference is external to the given parent.
198 -- The instantiation at point 3 requires no special treatment. The method
199 -- works as well for further nestings of generic units, but of course the
200 -- variable Current_Instantiated_Parent must be stacked because nested
201 -- instantiations can occur, e.g. the occurrence of 4 within 2.
203 -- The instantiation of package and subprogram bodies is handled in a
204 -- similar manner, except that it is delayed until after semantic
205 -- analysis is complete. In this fashion complex cross-dependencies
206 -- between several package declarations and bodies containing generics
207 -- can be compiled which otherwise would diagnose spurious circularities.
209 -- For example, it is possible to compile two packages A and B that
210 -- have the following structure:
212 -- package A is package B is
213 -- generic ... generic ...
214 -- package G_A is package G_B is
217 -- package body A is package body B is
218 -- package N_B is new G_B (..) package N_A is new G_A (..)
220 -- The table Pending_Instantiations in package Inline is used to keep
221 -- track of body instantiations that are delayed in this manner. Inline
222 -- handles the actual calls to do the body instantiations. This activity
223 -- is part of Inline, since the processing occurs at the same point, and
224 -- for essentially the same reason, as the handling of inlined routines.
226 ----------------------------------------------
227 -- Detection of Instantiation Circularities --
228 ----------------------------------------------
230 -- If we have a chain of instantiations that is circular, this is static
231 -- error which must be detected at compile time. The detection of these
232 -- circularities is carried out at the point that we insert a generic
233 -- instance spec or body. If there is a circularity, then the analysis of
234 -- the offending spec or body will eventually result in trying to load the
235 -- same unit again, and we detect this problem as we analyze the package
236 -- instantiation for the second time.
238 -- At least in some cases after we have detected the circularity, we get
239 -- into trouble if we try to keep going. The following flag is set if a
240 -- circularity is detected, and used to abandon compilation after the
241 -- messages have been posted.
243 Circularity_Detected : Boolean := False;
244 -- This should really be reset on encountering a new main unit, but in
245 -- practice we are not using multiple main units so it is not critical.
247 --------------------------------------------------
248 -- Formal packages and partial parameterization --
249 --------------------------------------------------
251 -- When compiling a generic, a formal package is a local instantiation. If
252 -- declared with a box, its generic formals are visible in the enclosing
253 -- generic. If declared with a partial list of actuals, those actuals that
254 -- are defaulted (covered by an Others clause, or given an explicit box
255 -- initialization) are also visible in the enclosing generic, while those
256 -- that have a corresponding actual are not.
258 -- In our source model of instantiation, the same visibility must be
259 -- present in the spec and body of an instance: the names of the formals
260 -- that are defaulted must be made visible within the instance, and made
261 -- invisible (hidden) after the instantiation is complete, so that they
262 -- are not accessible outside of the instance.
264 -- In a generic, a formal package is treated like a special instantiation.
265 -- Our Ada 95 compiler handled formals with and without box in different
266 -- ways. With partial parameterization, we use a single model for both.
267 -- We create a package declaration that consists of the specification of
268 -- the generic package, and a set of declarations that map the actuals
269 -- into local renamings, just as we do for bona fide instantiations. For
270 -- defaulted parameters and formals with a box, we copy directly the
271 -- declarations of the formal into this local package. The result is a
272 -- a package whose visible declarations may include generic formals. This
273 -- package is only used for type checking and visibility analysis, and
274 -- never reaches the back-end, so it can freely violate the placement
275 -- rules for generic formal declarations.
277 -- The list of declarations (renamings and copies of formals) is built
278 -- by Analyze_Associations, just as for regular instantiations.
280 -- At the point of instantiation, conformance checking must be applied only
281 -- to those parameters that were specified in the formal. We perform this
282 -- checking by creating another internal instantiation, this one including
283 -- only the renamings and the formals (the rest of the package spec is not
284 -- relevant to conformance checking). We can then traverse two lists: the
285 -- list of actuals in the instance that corresponds to the formal package,
286 -- and the list of actuals produced for this bogus instantiation. We apply
287 -- the conformance rules to those actuals that are not defaulted (i.e.
288 -- which still appear as generic formals.
290 -- When we compile an instance body we must make the right parameters
291 -- visible again. The predicate Is_Generic_Formal indicates which of the
292 -- formals should have its Is_Hidden flag reset.
294 -----------------------
295 -- Local subprograms --
296 -----------------------
298 procedure Abandon_Instantiation (N : Node_Id);
299 pragma No_Return (Abandon_Instantiation);
300 -- Posts an error message "instantiation abandoned" at the indicated node
301 -- and then raises the exception Instantiation_Error to do it.
303 procedure Analyze_Formal_Array_Type
304 (T : in out Entity_Id;
306 -- A formal array type is treated like an array type declaration, and
307 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
308 -- in-out, because in the case of an anonymous type the entity is
309 -- actually created in the procedure.
311 -- The following procedures treat other kinds of formal parameters
313 procedure Analyze_Formal_Derived_Interface_Type
318 procedure Analyze_Formal_Derived_Type
323 procedure Analyze_Formal_Interface_Type
328 -- The following subprograms create abbreviated declarations for formal
329 -- scalar types. We introduce an anonymous base of the proper class for
330 -- each of them, and define the formals as constrained first subtypes of
331 -- their bases. The bounds are expressions that are non-static in the
334 procedure Analyze_Formal_Decimal_Fixed_Point_Type
335 (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
337 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
338 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
339 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
340 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
341 (T : Entity_Id; Def : Node_Id);
343 procedure Analyze_Formal_Private_Type
347 -- Creates a new private type, which does not require completion
349 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id);
350 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
352 procedure Analyze_Generic_Formal_Part (N : Node_Id);
353 -- Analyze generic formal part
355 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
356 -- Create a new access type with the given designated type
358 function Analyze_Associations
361 F_Copy : List_Id) return List_Id;
362 -- At instantiation time, build the list of associations between formals
363 -- and actuals. Each association becomes a renaming declaration for the
364 -- formal entity. F_Copy is the analyzed list of formals in the generic
365 -- copy. It is used to apply legality checks to the actuals. I_Node is the
366 -- instantiation node itself.
368 procedure Analyze_Subprogram_Instantiation
372 procedure Build_Instance_Compilation_Unit_Nodes
376 -- This procedure is used in the case where the generic instance of a
377 -- subprogram body or package body is a library unit. In this case, the
378 -- original library unit node for the generic instantiation must be
379 -- replaced by the resulting generic body, and a link made to a new
380 -- compilation unit node for the generic declaration. The argument N is
381 -- the original generic instantiation. Act_Body and Act_Decl are the body
382 -- and declaration of the instance (either package body and declaration
383 -- nodes or subprogram body and declaration nodes depending on the case).
384 -- On return, the node N has been rewritten with the actual body.
386 procedure Check_Access_Definition (N : Node_Id);
387 -- Subsidiary routine to null exclusion processing. Perform an assertion
388 -- check on Ada version and the presence of an access definition in N.
390 procedure Check_Formal_Packages (P_Id : Entity_Id);
391 -- Apply the following to all formal packages in generic associations
393 procedure Check_Formal_Package_Instance
394 (Formal_Pack : Entity_Id;
395 Actual_Pack : Entity_Id);
396 -- Verify that the actuals of the actual instance match the actuals of
397 -- the template for a formal package that is not declared with a box.
399 procedure Check_Forward_Instantiation (Decl : Node_Id);
400 -- If the generic is a local entity and the corresponding body has not
401 -- been seen yet, flag enclosing packages to indicate that it will be
402 -- elaborated after the generic body. Subprograms declared in the same
403 -- package cannot be inlined by the front-end because front-end inlining
404 -- requires a strict linear order of elaboration.
406 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id;
407 -- Check if some association between formals and actuals requires to make
408 -- visible primitives of a tagged type, and make those primitives visible.
409 -- Return the list of primitives whose visibility is modified (to restore
410 -- their visibility later through Restore_Hidden_Primitives). If no
411 -- candidate is found then return No_Elist.
413 procedure Check_Hidden_Child_Unit
415 Gen_Unit : Entity_Id;
416 Act_Decl_Id : Entity_Id);
417 -- If the generic unit is an implicit child instance within a parent
418 -- instance, we need to make an explicit test that it is not hidden by
419 -- a child instance of the same name and parent.
421 procedure Check_Generic_Actuals
422 (Instance : Entity_Id;
423 Is_Formal_Box : Boolean);
424 -- Similar to previous one. Check the actuals in the instantiation,
425 -- whose views can change between the point of instantiation and the point
426 -- of instantiation of the body. In addition, mark the generic renamings
427 -- as generic actuals, so that they are not compatible with other actuals.
428 -- Recurse on an actual that is a formal package whose declaration has
431 function Contains_Instance_Of
434 N : Node_Id) return Boolean;
435 -- Inner is instantiated within the generic Outer. Check whether Inner
436 -- directly or indirectly contains an instance of Outer or of one of its
437 -- parents, in the case of a subunit. Each generic unit holds a list of
438 -- the entities instantiated within (at any depth). This procedure
439 -- determines whether the set of such lists contains a cycle, i.e. an
440 -- illegal circular instantiation.
442 function Denotes_Formal_Package
444 On_Exit : Boolean := False;
445 Instance : Entity_Id := Empty) return Boolean;
446 -- Returns True if E is a formal package of an enclosing generic, or
447 -- the actual for such a formal in an enclosing instantiation. If such
448 -- a package is used as a formal in an nested generic, or as an actual
449 -- in a nested instantiation, the visibility of ITS formals should not
450 -- be modified. When called from within Restore_Private_Views, the flag
451 -- On_Exit is true, to indicate that the search for a possible enclosing
452 -- instance should ignore the current one. In that case Instance denotes
453 -- the declaration for which this is an actual. This declaration may be
454 -- an instantiation in the source, or the internal instantiation that
455 -- corresponds to the actual for a formal package.
457 function Earlier (N1, N2 : Node_Id) return Boolean;
458 -- Yields True if N1 and N2 appear in the same compilation unit,
459 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
460 -- traversal of the tree for the unit. Used to determine the placement
461 -- of freeze nodes for instance bodies that may depend on other instances.
463 function Find_Actual_Type
465 Gen_Type : Entity_Id) return Entity_Id;
466 -- When validating the actual types of a child instance, check whether
467 -- the formal is a formal type of the parent unit, and retrieve the current
468 -- actual for it. Typ is the entity in the analyzed formal type declaration
469 -- (component or index type of an array type, or designated type of an
470 -- access formal) and Gen_Type is the enclosing analyzed formal array
471 -- or access type. The desired actual may be a formal of a parent, or may
472 -- be declared in a formal package of a parent. In both cases it is a
473 -- generic actual type because it appears within a visible instance.
474 -- Finally, it may be declared in a parent unit without being a formal
475 -- of that unit, in which case it must be retrieved by visibility.
476 -- Ambiguities may still arise if two homonyms are declared in two formal
477 -- packages, and the prefix of the formal type may be needed to resolve
478 -- the ambiguity in the instance ???
480 function In_Same_Declarative_Part
482 Inst : Node_Id) return Boolean;
483 -- True if the instantiation Inst and the given freeze_node F_Node appear
484 -- within the same declarative part, ignoring subunits, but with no inter-
485 -- vening subprograms or concurrent units. Used to find the proper plave
486 -- for the freeze node of an instance, when the generic is declared in a
487 -- previous instance. If predicate is true, the freeze node of the instance
488 -- can be placed after the freeze node of the previous instance, Otherwise
489 -- it has to be placed at the end of the current declarative part.
491 function In_Main_Context (E : Entity_Id) return Boolean;
492 -- Check whether an instantiation is in the context of the main unit.
493 -- Used to determine whether its body should be elaborated to allow
494 -- front-end inlining.
496 procedure Set_Instance_Env
497 (Gen_Unit : Entity_Id;
498 Act_Unit : Entity_Id);
499 -- Save current instance on saved environment, to be used to determine
500 -- the global status of entities in nested instances. Part of Save_Env.
501 -- called after verifying that the generic unit is legal for the instance,
502 -- The procedure also examines whether the generic unit is a predefined
503 -- unit, in order to set configuration switches accordingly. As a result
504 -- the procedure must be called after analyzing and freezing the actuals.
506 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
507 -- Associate analyzed generic parameter with corresponding
508 -- instance. Used for semantic checks at instantiation time.
510 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
511 -- Traverse the Exchanged_Views list to see if a type was private
512 -- and has already been flipped during this phase of instantiation.
514 procedure Hide_Current_Scope;
515 -- When instantiating a generic child unit, the parent context must be
516 -- present, but the instance and all entities that may be generated
517 -- must be inserted in the current scope. We leave the current scope
518 -- on the stack, but make its entities invisible to avoid visibility
519 -- problems. This is reversed at the end of the instantiation. This is
520 -- not done for the instantiation of the bodies, which only require the
521 -- instances of the generic parents to be in scope.
523 procedure Install_Body
528 -- If the instantiation happens textually before the body of the generic,
529 -- the instantiation of the body must be analyzed after the generic body,
530 -- and not at the point of instantiation. Such early instantiations can
531 -- happen if the generic and the instance appear in a package declaration
532 -- because the generic body can only appear in the corresponding package
533 -- body. Early instantiations can also appear if generic, instance and
534 -- body are all in the declarative part of a subprogram or entry. Entities
535 -- of packages that are early instantiations are delayed, and their freeze
536 -- node appears after the generic body.
538 procedure Insert_Freeze_Node_For_Instance
541 -- N denotes a package or a subprogram instantiation and F_Node is the
542 -- associated freeze node. Insert the freeze node before the first source
543 -- body which follows immediately after N. If no such body is found, the
544 -- freeze node is inserted at the end of the declarative region which
547 procedure Freeze_Subprogram_Body
548 (Inst_Node : Node_Id;
550 Pack_Id : Entity_Id);
551 -- The generic body may appear textually after the instance, including
552 -- in the proper body of a stub, or within a different package instance.
553 -- Given that the instance can only be elaborated after the generic, we
554 -- place freeze_nodes for the instance and/or for packages that may enclose
555 -- the instance and the generic, so that the back-end can establish the
556 -- proper order of elaboration.
559 -- Establish environment for subsequent instantiation. Separated from
560 -- Save_Env because data-structures for visibility handling must be
561 -- initialized before call to Check_Generic_Child_Unit.
563 procedure Install_Formal_Packages (Par : Entity_Id);
564 -- Install the visible part of any formal of the parent that is a formal
565 -- package. Note that for the case of a formal package with a box, this
566 -- includes the formal part of the formal package (12.7(10/2)).
568 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
569 -- When compiling an instance of a child unit the parent (which is
570 -- itself an instance) is an enclosing scope that must be made
571 -- immediately visible. This procedure is also used to install the non-
572 -- generic parent of a generic child unit when compiling its body, so
573 -- that full views of types in the parent are made visible.
575 procedure Remove_Parent (In_Body : Boolean := False);
576 -- Reverse effect after instantiation of child is complete
578 procedure Install_Hidden_Primitives
579 (Prims_List : in out Elist_Id;
582 -- Remove suffix 'P' from hidden primitives of Act_T to match the
583 -- visibility of primitives of Gen_T. The list of primitives to which
584 -- the suffix is removed is added to Prims_List to restore them later.
586 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id);
587 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
590 procedure Inline_Instance_Body
592 Gen_Unit : Entity_Id;
594 -- If front-end inlining is requested, instantiate the package body,
595 -- and preserve the visibility of its compilation unit, to insure
596 -- that successive instantiations succeed.
598 -- The functions Instantiate_XXX perform various legality checks and build
599 -- the declarations for instantiated generic parameters. In all of these
600 -- Formal is the entity in the generic unit, Actual is the entity of
601 -- expression in the generic associations, and Analyzed_Formal is the
602 -- formal in the generic copy, which contains the semantic information to
603 -- be used to validate the actual.
605 function Instantiate_Object
608 Analyzed_Formal : Node_Id) return List_Id;
610 function Instantiate_Type
613 Analyzed_Formal : Node_Id;
614 Actual_Decls : List_Id) return List_Id;
616 function Instantiate_Formal_Subprogram
619 Analyzed_Formal : Node_Id) return Node_Id;
621 function Instantiate_Formal_Package
624 Analyzed_Formal : Node_Id) return List_Id;
625 -- If the formal package is declared with a box, special visibility rules
626 -- apply to its formals: they are in the visible part of the package. This
627 -- is true in the declarative region of the formal package, that is to say
628 -- in the enclosing generic or instantiation. For an instantiation, the
629 -- parameters of the formal package are made visible in an explicit step.
630 -- Furthermore, if the actual has a visible USE clause, these formals must
631 -- be made potentially use-visible as well. On exit from the enclosing
632 -- instantiation, the reverse must be done.
634 -- For a formal package declared without a box, there are conformance rules
635 -- that apply to the actuals in the generic declaration and the actuals of
636 -- the actual package in the enclosing instantiation. The simplest way to
637 -- apply these rules is to repeat the instantiation of the formal package
638 -- in the context of the enclosing instance, and compare the generic
639 -- associations of this instantiation with those of the actual package.
640 -- This internal instantiation only needs to contain the renamings of the
641 -- formals: the visible and private declarations themselves need not be
644 -- In Ada 2005, the formal package may be only partially parameterized.
645 -- In that case the visibility step must make visible those actuals whose
646 -- corresponding formals were given with a box. A final complication
647 -- involves inherited operations from formal derived types, which must
648 -- be visible if the type is.
650 function Is_In_Main_Unit (N : Node_Id) return Boolean;
651 -- Test if given node is in the main unit
653 procedure Load_Parent_Of_Generic
656 Body_Optional : Boolean := False);
657 -- If the generic appears in a separate non-generic library unit, load the
658 -- corresponding body to retrieve the body of the generic. N is the node
659 -- for the generic instantiation, Spec is the generic package declaration.
661 -- Body_Optional is a flag that indicates that the body is being loaded to
662 -- ensure that temporaries are generated consistently when there are other
663 -- instances in the current declarative part that precede the one being
664 -- loaded. In that case a missing body is acceptable.
666 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
667 -- Add the context clause of the unit containing a generic unit to a
668 -- compilation unit that is, or contains, an instantiation.
670 function Get_Associated_Node (N : Node_Id) return Node_Id;
671 -- In order to propagate semantic information back from the analyzed copy
672 -- to the original generic, we maintain links between selected nodes in the
673 -- generic and their corresponding copies. At the end of generic analysis,
674 -- the routine Save_Global_References traverses the generic tree, examines
675 -- the semantic information, and preserves the links to those nodes that
676 -- contain global information. At instantiation, the information from the
677 -- associated node is placed on the new copy, so that name resolution is
680 -- Three kinds of source nodes have associated nodes:
682 -- a) those that can reference (denote) entities, that is identifiers,
683 -- character literals, expanded_names, operator symbols, operators,
684 -- and attribute reference nodes. These nodes have an Entity field
685 -- and are the set of nodes that are in N_Has_Entity.
687 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
689 -- c) selected components (N_Selected_Component)
691 -- For the first class, the associated node preserves the entity if it is
692 -- global. If the generic contains nested instantiations, the associated
693 -- node itself has been recopied, and a chain of them must be followed.
695 -- For aggregates, the associated node allows retrieval of the type, which
696 -- may otherwise not appear in the generic. The view of this type may be
697 -- different between generic and instantiation, and the full view can be
698 -- installed before the instantiation is analyzed. For aggregates of type
699 -- extensions, the same view exchange may have to be performed for some of
700 -- the ancestor types, if their view is private at the point of
703 -- Nodes that are selected components in the parse tree may be rewritten
704 -- as expanded names after resolution, and must be treated as potential
705 -- entity holders, which is why they also have an Associated_Node.
707 -- Nodes that do not come from source, such as freeze nodes, do not appear
708 -- in the generic tree, and need not have an associated node.
710 -- The associated node is stored in the Associated_Node field. Note that
711 -- this field overlaps Entity, which is fine, because the whole point is
712 -- that we don't need or want the normal Entity field in this situation.
714 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
715 -- Within the generic part, entities in the formal package are
716 -- visible. To validate subsequent type declarations, indicate
717 -- the correspondence between the entities in the analyzed formal,
718 -- and the entities in the actual package. There are three packages
719 -- involved in the instantiation of a formal package: the parent
720 -- generic P1 which appears in the generic declaration, the fake
721 -- instantiation P2 which appears in the analyzed generic, and whose
722 -- visible entities may be used in subsequent formals, and the actual
723 -- P3 in the instance. To validate subsequent formals, me indicate
724 -- that the entities in P2 are mapped into those of P3. The mapping of
725 -- entities has to be done recursively for nested packages.
727 procedure Move_Freeze_Nodes
731 -- Freeze nodes can be generated in the analysis of a generic unit, but
732 -- will not be seen by the back-end. It is necessary to move those nodes
733 -- to the enclosing scope if they freeze an outer entity. We place them
734 -- at the end of the enclosing generic package, which is semantically
737 procedure Preanalyze_Actuals (N : Node_Id);
738 -- Analyze actuals to perform name resolution. Full resolution is done
739 -- later, when the expected types are known, but names have to be captured
740 -- before installing parents of generics, that are not visible for the
741 -- actuals themselves.
743 function True_Parent (N : Node_Id) return Node_Id;
744 -- For a subunit, return parent of corresponding stub, else return
747 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
748 -- Verify that an attribute that appears as the default for a formal
749 -- subprogram is a function or procedure with the correct profile.
751 -------------------------------------------
752 -- Data Structures for Generic Renamings --
753 -------------------------------------------
755 -- The map Generic_Renamings associates generic entities with their
756 -- corresponding actuals. Currently used to validate type instances. It
757 -- will eventually be used for all generic parameters to eliminate the
758 -- need for overload resolution in the instance.
760 type Assoc_Ptr is new Int;
762 Assoc_Null : constant Assoc_Ptr := -1;
767 Next_In_HTable : Assoc_Ptr;
770 package Generic_Renamings is new Table.Table
771 (Table_Component_Type => Assoc,
772 Table_Index_Type => Assoc_Ptr,
773 Table_Low_Bound => 0,
775 Table_Increment => 100,
776 Table_Name => "Generic_Renamings");
778 -- Variable to hold enclosing instantiation. When the environment is
779 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
781 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
783 -- Hash table for associations
785 HTable_Size : constant := 37;
786 type HTable_Range is range 0 .. HTable_Size - 1;
788 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
789 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
790 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
791 function Hash (F : Entity_Id) return HTable_Range;
793 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
794 Header_Num => HTable_Range,
796 Elmt_Ptr => Assoc_Ptr,
797 Null_Ptr => Assoc_Null,
798 Set_Next => Set_Next_Assoc,
801 Get_Key => Get_Gen_Id,
805 Exchanged_Views : Elist_Id;
806 -- This list holds the private views that have been exchanged during
807 -- instantiation to restore the visibility of the generic declaration.
808 -- (see comments above). After instantiation, the current visibility is
809 -- reestablished by means of a traversal of this list.
811 Hidden_Entities : Elist_Id;
812 -- This list holds the entities of the current scope that are removed
813 -- from immediate visibility when instantiating a child unit. Their
814 -- visibility is restored in Remove_Parent.
816 -- Because instantiations can be recursive, the following must be saved
817 -- on entry and restored on exit from an instantiation (spec or body).
818 -- This is done by the two procedures Save_Env and Restore_Env. For
819 -- package and subprogram instantiations (but not for the body instances)
820 -- the action of Save_Env is done in two steps: Init_Env is called before
821 -- Check_Generic_Child_Unit, because setting the parent instances requires
822 -- that the visibility data structures be properly initialized. Once the
823 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
825 Parent_Unit_Visible : Boolean := False;
826 -- Parent_Unit_Visible is used when the generic is a child unit, and
827 -- indicates whether the ultimate parent of the generic is visible in the
828 -- instantiation environment. It is used to reset the visibility of the
829 -- parent at the end of the instantiation (see Remove_Parent).
831 Instance_Parent_Unit : Entity_Id := Empty;
832 -- This records the ultimate parent unit of an instance of a generic
833 -- child unit and is used in conjunction with Parent_Unit_Visible to
834 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
836 type Instance_Env is record
837 Instantiated_Parent : Assoc;
838 Exchanged_Views : Elist_Id;
839 Hidden_Entities : Elist_Id;
840 Current_Sem_Unit : Unit_Number_Type;
841 Parent_Unit_Visible : Boolean := False;
842 Instance_Parent_Unit : Entity_Id := Empty;
843 Switches : Config_Switches_Type;
846 package Instance_Envs is new Table.Table (
847 Table_Component_Type => Instance_Env,
848 Table_Index_Type => Int,
849 Table_Low_Bound => 0,
851 Table_Increment => 100,
852 Table_Name => "Instance_Envs");
854 procedure Restore_Private_Views
855 (Pack_Id : Entity_Id;
856 Is_Package : Boolean := True);
857 -- Restore the private views of external types, and unmark the generic
858 -- renamings of actuals, so that they become compatible subtypes again.
859 -- For subprograms, Pack_Id is the package constructed to hold the
862 procedure Switch_View (T : Entity_Id);
863 -- Switch the partial and full views of a type and its private
864 -- dependents (i.e. its subtypes and derived types).
866 ------------------------------------
867 -- Structures for Error Reporting --
868 ------------------------------------
870 Instantiation_Node : Node_Id;
871 -- Used by subprograms that validate instantiation of formal parameters
872 -- where there might be no actual on which to place the error message.
873 -- Also used to locate the instantiation node for generic subunits.
875 Instantiation_Error : exception;
876 -- When there is a semantic error in the generic parameter matching,
877 -- there is no point in continuing the instantiation, because the
878 -- number of cascaded errors is unpredictable. This exception aborts
879 -- the instantiation process altogether.
881 S_Adjustment : Sloc_Adjustment;
882 -- Offset created for each node in an instantiation, in order to keep
883 -- track of the source position of the instantiation in each of its nodes.
884 -- A subsequent semantic error or warning on a construct of the instance
885 -- points to both places: the original generic node, and the point of
886 -- instantiation. See Sinput and Sinput.L for additional details.
888 ------------------------------------------------------------
889 -- Data structure for keeping track when inside a Generic --
890 ------------------------------------------------------------
892 -- The following table is used to save values of the Inside_A_Generic
893 -- flag (see spec of Sem) when they are saved by Start_Generic.
895 package Generic_Flags is new Table.Table (
896 Table_Component_Type => Boolean,
897 Table_Index_Type => Int,
898 Table_Low_Bound => 0,
900 Table_Increment => 200,
901 Table_Name => "Generic_Flags");
903 ---------------------------
904 -- Abandon_Instantiation --
905 ---------------------------
907 procedure Abandon_Instantiation (N : Node_Id) is
909 Error_Msg_N ("\instantiation abandoned!", N);
910 raise Instantiation_Error;
911 end Abandon_Instantiation;
913 --------------------------
914 -- Analyze_Associations --
915 --------------------------
917 function Analyze_Associations
920 F_Copy : List_Id) return List_Id
922 Actuals_To_Freeze : constant Elist_Id := New_Elmt_List;
923 Assoc : constant List_Id := New_List;
924 Default_Actuals : constant Elist_Id := New_Elmt_List;
925 Gen_Unit : constant Entity_Id :=
926 Defining_Entity (Parent (F_Copy));
930 Analyzed_Formal : Node_Id;
931 First_Named : Node_Id := Empty;
935 Saved_Formal : Node_Id;
937 Default_Formals : constant List_Id := New_List;
938 -- If an Others_Choice is present, some of the formals may be defaulted.
939 -- To simplify the treatment of visibility in an instance, we introduce
940 -- individual defaults for each such formal. These defaults are
941 -- appended to the list of associations and replace the Others_Choice.
943 Found_Assoc : Node_Id;
944 -- Association for the current formal being match. Empty if there are
945 -- no remaining actuals, or if there is no named association with the
946 -- name of the formal.
948 Is_Named_Assoc : Boolean;
949 Num_Matched : Int := 0;
950 Num_Actuals : Int := 0;
952 Others_Present : Boolean := False;
953 Others_Choice : Node_Id := Empty;
954 -- In Ada 2005, indicates partial parameterization of a formal
955 -- package. As usual an other association must be last in the list.
957 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id);
958 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
959 -- cannot have a named association for it. AI05-0025 extends this rule
960 -- to formals of formal packages by AI05-0025, and it also applies to
961 -- box-initialized formals.
963 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean;
964 -- Determine whether the parameter types and the return type of Subp
965 -- are fully defined at the point of instantiation.
967 function Matching_Actual
969 A_F : Entity_Id) return Node_Id;
970 -- Find actual that corresponds to a given a formal parameter. If the
971 -- actuals are positional, return the next one, if any. If the actuals
972 -- are named, scan the parameter associations to find the right one.
973 -- A_F is the corresponding entity in the analyzed generic,which is
974 -- placed on the selector name for ASIS use.
976 -- In Ada 2005, a named association may be given with a box, in which
977 -- case Matching_Actual sets Found_Assoc to the generic association,
978 -- but return Empty for the actual itself. In this case the code below
979 -- creates a corresponding declaration for the formal.
981 function Partial_Parameterization return Boolean;
982 -- Ada 2005: if no match is found for a given formal, check if the
983 -- association for it includes a box, or whether the associations
984 -- include an Others clause.
986 procedure Process_Default (F : Entity_Id);
987 -- Add a copy of the declaration of generic formal F to the list of
988 -- associations, and add an explicit box association for F if there
989 -- is none yet, and the default comes from an Others_Choice.
991 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean;
992 -- Determine whether Subp renames one of the subprograms defined in the
993 -- generated package Standard.
995 procedure Set_Analyzed_Formal;
996 -- Find the node in the generic copy that corresponds to a given formal.
997 -- The semantic information on this node is used to perform legality
998 -- checks on the actuals. Because semantic analysis can introduce some
999 -- anonymous entities or modify the declaration node itself, the
1000 -- correspondence between the two lists is not one-one. In addition to
1001 -- anonymous types, the presence a formal equality will introduce an
1002 -- implicit declaration for the corresponding inequality.
1004 ----------------------------------------
1005 -- Check_Overloaded_Formal_Subprogram --
1006 ----------------------------------------
1008 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is
1009 Temp_Formal : Entity_Id;
1012 Temp_Formal := First (Formals);
1013 while Present (Temp_Formal) loop
1014 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration
1015 and then Temp_Formal /= Formal
1017 Chars (Defining_Unit_Name (Specification (Formal))) =
1018 Chars (Defining_Unit_Name (Specification (Temp_Formal)))
1020 if Present (Found_Assoc) then
1022 ("named association not allowed for overloaded formal",
1027 ("named association not allowed for overloaded formal",
1031 Abandon_Instantiation (Instantiation_Node);
1036 end Check_Overloaded_Formal_Subprogram;
1038 -------------------------------
1039 -- Has_Fully_Defined_Profile --
1040 -------------------------------
1042 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean is
1043 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean;
1044 -- Determine whethet type Typ is fully defined
1046 ---------------------------
1047 -- Is_Fully_Defined_Type --
1048 ---------------------------
1050 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean is
1052 -- A private type without a full view is not fully defined
1054 if Is_Private_Type (Typ)
1055 and then No (Full_View (Typ))
1059 -- An incomplete type is never fully defined
1061 elsif Is_Incomplete_Type (Typ) then
1064 -- All other types are fully defined
1069 end Is_Fully_Defined_Type;
1071 -- Local declarations
1075 -- Start of processing for Has_Fully_Defined_Profile
1078 -- Check the parameters
1080 Param := First_Formal (Subp);
1081 while Present (Param) loop
1082 if not Is_Fully_Defined_Type (Etype (Param)) then
1086 Next_Formal (Param);
1089 -- Check the return type
1091 return Is_Fully_Defined_Type (Etype (Subp));
1092 end Has_Fully_Defined_Profile;
1094 ---------------------
1095 -- Matching_Actual --
1096 ---------------------
1098 function Matching_Actual
1100 A_F : Entity_Id) return Node_Id
1106 Is_Named_Assoc := False;
1108 -- End of list of purely positional parameters
1110 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
1111 Found_Assoc := Empty;
1114 -- Case of positional parameter corresponding to current formal
1116 elsif No (Selector_Name (Actual)) then
1117 Found_Assoc := Actual;
1118 Act := Explicit_Generic_Actual_Parameter (Actual);
1119 Num_Matched := Num_Matched + 1;
1122 -- Otherwise scan list of named actuals to find the one with the
1123 -- desired name. All remaining actuals have explicit names.
1126 Is_Named_Assoc := True;
1127 Found_Assoc := Empty;
1131 while Present (Actual) loop
1132 if Chars (Selector_Name (Actual)) = Chars (F) then
1133 Set_Entity (Selector_Name (Actual), A_F);
1134 Set_Etype (Selector_Name (Actual), Etype (A_F));
1135 Generate_Reference (A_F, Selector_Name (Actual));
1136 Found_Assoc := Actual;
1137 Act := Explicit_Generic_Actual_Parameter (Actual);
1138 Num_Matched := Num_Matched + 1;
1146 -- Reset for subsequent searches. In most cases the named
1147 -- associations are in order. If they are not, we reorder them
1148 -- to avoid scanning twice the same actual. This is not just a
1149 -- question of efficiency: there may be multiple defaults with
1150 -- boxes that have the same name. In a nested instantiation we
1151 -- insert actuals for those defaults, and cannot rely on their
1152 -- names to disambiguate them.
1154 if Actual = First_Named then
1157 elsif Present (Actual) then
1158 Insert_Before (First_Named, Remove_Next (Prev));
1161 Actual := First_Named;
1164 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1165 Set_Used_As_Generic_Actual (Entity (Act));
1169 end Matching_Actual;
1171 ------------------------------
1172 -- Partial_Parameterization --
1173 ------------------------------
1175 function Partial_Parameterization return Boolean is
1177 return Others_Present
1178 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1179 end Partial_Parameterization;
1181 ---------------------
1182 -- Process_Default --
1183 ---------------------
1185 procedure Process_Default (F : Entity_Id) is
1186 Loc : constant Source_Ptr := Sloc (I_Node);
1187 F_Id : constant Entity_Id := Defining_Entity (F);
1193 -- Append copy of formal declaration to associations, and create new
1194 -- defining identifier for it.
1196 Decl := New_Copy_Tree (F);
1197 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id));
1199 if Nkind (F) in N_Formal_Subprogram_Declaration then
1200 Set_Defining_Unit_Name (Specification (Decl), Id);
1203 Set_Defining_Identifier (Decl, Id);
1206 Append (Decl, Assoc);
1208 if No (Found_Assoc) then
1210 Make_Generic_Association (Loc,
1211 Selector_Name => New_Occurrence_Of (Id, Loc),
1212 Explicit_Generic_Actual_Parameter => Empty);
1213 Set_Box_Present (Default);
1214 Append (Default, Default_Formals);
1216 end Process_Default;
1218 ---------------------------------
1219 -- Renames_Standard_Subprogram --
1220 ---------------------------------
1222 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean is
1227 while Present (Id) loop
1228 if Scope (Id) = Standard_Standard then
1236 end Renames_Standard_Subprogram;
1238 -------------------------
1239 -- Set_Analyzed_Formal --
1240 -------------------------
1242 procedure Set_Analyzed_Formal is
1246 while Present (Analyzed_Formal) loop
1247 Kind := Nkind (Analyzed_Formal);
1249 case Nkind (Formal) is
1251 when N_Formal_Subprogram_Declaration =>
1252 exit when Kind in N_Formal_Subprogram_Declaration
1255 (Defining_Unit_Name (Specification (Formal))) =
1257 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1259 when N_Formal_Package_Declaration =>
1260 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1261 N_Generic_Package_Declaration,
1262 N_Package_Declaration);
1264 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1268 -- Skip freeze nodes, and nodes inserted to replace
1269 -- unrecognized pragmas.
1272 Kind not in N_Formal_Subprogram_Declaration
1273 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1277 and then Chars (Defining_Identifier (Formal)) =
1278 Chars (Defining_Identifier (Analyzed_Formal));
1281 Next (Analyzed_Formal);
1283 end Set_Analyzed_Formal;
1285 -- Start of processing for Analyze_Associations
1288 Actuals := Generic_Associations (I_Node);
1290 if Present (Actuals) then
1292 -- Check for an Others choice, indicating a partial parameterization
1293 -- for a formal package.
1295 Actual := First (Actuals);
1296 while Present (Actual) loop
1297 if Nkind (Actual) = N_Others_Choice then
1298 Others_Present := True;
1299 Others_Choice := Actual;
1301 if Present (Next (Actual)) then
1302 Error_Msg_N ("others must be last association", Actual);
1305 -- This subprogram is used both for formal packages and for
1306 -- instantiations. For the latter, associations must all be
1309 if Nkind (I_Node) /= N_Formal_Package_Declaration
1310 and then Comes_From_Source (I_Node)
1313 ("others association not allowed in an instance",
1317 -- In any case, nothing to do after the others association
1321 elsif Box_Present (Actual)
1322 and then Comes_From_Source (I_Node)
1323 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1326 ("box association not allowed in an instance", Actual);
1332 -- If named associations are present, save first named association
1333 -- (it may of course be Empty) to facilitate subsequent name search.
1335 First_Named := First (Actuals);
1336 while Present (First_Named)
1337 and then Nkind (First_Named) /= N_Others_Choice
1338 and then No (Selector_Name (First_Named))
1340 Num_Actuals := Num_Actuals + 1;
1345 Named := First_Named;
1346 while Present (Named) loop
1347 if Nkind (Named) /= N_Others_Choice
1348 and then No (Selector_Name (Named))
1350 Error_Msg_N ("invalid positional actual after named one", Named);
1351 Abandon_Instantiation (Named);
1354 -- A named association may lack an actual parameter, if it was
1355 -- introduced for a default subprogram that turns out to be local
1356 -- to the outer instantiation.
1358 if Nkind (Named) /= N_Others_Choice
1359 and then Present (Explicit_Generic_Actual_Parameter (Named))
1361 Num_Actuals := Num_Actuals + 1;
1367 if Present (Formals) then
1368 Formal := First_Non_Pragma (Formals);
1369 Analyzed_Formal := First_Non_Pragma (F_Copy);
1371 if Present (Actuals) then
1372 Actual := First (Actuals);
1374 -- All formals should have default values
1380 while Present (Formal) loop
1381 Set_Analyzed_Formal;
1382 Saved_Formal := Next_Non_Pragma (Formal);
1384 case Nkind (Formal) is
1385 when N_Formal_Object_Declaration =>
1388 Defining_Identifier (Formal),
1389 Defining_Identifier (Analyzed_Formal));
1391 if No (Match) and then Partial_Parameterization then
1392 Process_Default (Formal);
1395 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1399 when N_Formal_Type_Declaration =>
1402 Defining_Identifier (Formal),
1403 Defining_Identifier (Analyzed_Formal));
1406 if Partial_Parameterization then
1407 Process_Default (Formal);
1410 Error_Msg_Sloc := Sloc (Gen_Unit);
1414 Defining_Identifier (Formal));
1415 Error_Msg_NE ("\in instantiation of & declared#",
1416 Instantiation_Node, Gen_Unit);
1417 Abandon_Instantiation (Instantiation_Node);
1424 (Formal, Match, Analyzed_Formal, Assoc),
1427 -- An instantiation is a freeze point for the actuals,
1428 -- unless this is a rewritten formal package, or the
1429 -- formal is an Ada 2012 formal incomplete type.
1431 if Nkind (I_Node) = N_Formal_Package_Declaration
1433 (Ada_Version >= Ada_2012
1435 Ekind (Defining_Identifier (Analyzed_Formal)) =
1441 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1445 -- A remote access-to-class-wide type is not a legal actual
1446 -- for a generic formal of an access type (E.2.2(17/2)).
1447 -- In GNAT an exception to this rule is introduced when
1448 -- the formal is marked as remote using implementation
1449 -- defined aspect/pragma Remote_Access_Type. In that case
1450 -- the actual must be remote as well.
1452 -- If the current instantiation is the construction of a
1453 -- local copy for a formal package the actuals may be
1454 -- defaulted, and there is no matching actual to check.
1456 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1458 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1459 N_Access_To_Object_Definition
1460 and then Present (Match)
1463 Formal_Ent : constant Entity_Id :=
1464 Defining_Identifier (Analyzed_Formal);
1466 if Is_Remote_Access_To_Class_Wide_Type (Entity (Match))
1467 = Is_Remote_Types (Formal_Ent)
1469 -- Remoteness of formal and actual match
1473 elsif Is_Remote_Types (Formal_Ent) then
1475 -- Remote formal, non-remote actual
1478 ("actual for& must be remote", Match, Formal_Ent);
1481 -- Non-remote formal, remote actual
1484 ("actual for& may not be remote",
1490 when N_Formal_Subprogram_Declaration =>
1493 (Defining_Unit_Name (Specification (Formal)),
1494 Defining_Unit_Name (Specification (Analyzed_Formal)));
1496 -- If the formal subprogram has the same name as another
1497 -- formal subprogram of the generic, then a named
1498 -- association is illegal (12.3(9)). Exclude named
1499 -- associations that are generated for a nested instance.
1502 and then Is_Named_Assoc
1503 and then Comes_From_Source (Found_Assoc)
1505 Check_Overloaded_Formal_Subprogram (Formal);
1508 -- If there is no corresponding actual, this may be case
1509 -- of partial parameterization, or else the formal has a
1510 -- default or a box.
1512 if No (Match) and then Partial_Parameterization then
1513 Process_Default (Formal);
1515 if Nkind (I_Node) = N_Formal_Package_Declaration then
1516 Check_Overloaded_Formal_Subprogram (Formal);
1521 Instantiate_Formal_Subprogram
1522 (Formal, Match, Analyzed_Formal));
1524 -- An instantiation is a freeze point for the actuals,
1525 -- unless this is a rewritten formal package.
1527 if Nkind (I_Node) /= N_Formal_Package_Declaration
1528 and then Nkind (Match) = N_Identifier
1529 and then Is_Subprogram (Entity (Match))
1531 -- The actual subprogram may rename a routine defined
1532 -- in Standard. Avoid freezing such renamings because
1533 -- subprograms coming from Standard cannot be frozen.
1536 not Renames_Standard_Subprogram (Entity (Match))
1538 -- If the actual subprogram comes from a different
1539 -- unit, it is already frozen, either by a body in
1540 -- that unit or by the end of the declarative part
1541 -- of the unit. This check avoids the freezing of
1542 -- subprograms defined in Standard which are used
1543 -- as generic actuals.
1545 and then In_Same_Code_Unit (Entity (Match), I_Node)
1546 and then Has_Fully_Defined_Profile (Entity (Match))
1548 -- Mark the subprogram as having a delayed freeze
1549 -- since this may be an out-of-order action.
1551 Set_Has_Delayed_Freeze (Entity (Match));
1552 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1556 -- If this is a nested generic, preserve default for later
1560 and then Box_Present (Formal)
1563 (Defining_Unit_Name (Specification (Last (Assoc))),
1567 when N_Formal_Package_Declaration =>
1570 Defining_Identifier (Formal),
1571 Defining_Identifier (Original_Node (Analyzed_Formal)));
1574 if Partial_Parameterization then
1575 Process_Default (Formal);
1578 Error_Msg_Sloc := Sloc (Gen_Unit);
1581 Instantiation_Node, Defining_Identifier (Formal));
1582 Error_Msg_NE ("\in instantiation of & declared#",
1583 Instantiation_Node, Gen_Unit);
1585 Abandon_Instantiation (Instantiation_Node);
1591 (Instantiate_Formal_Package
1592 (Formal, Match, Analyzed_Formal),
1596 -- For use type and use package appearing in the generic part,
1597 -- we have already copied them, so we can just move them where
1598 -- they belong (we mustn't recopy them since this would mess up
1599 -- the Sloc values).
1601 when N_Use_Package_Clause |
1602 N_Use_Type_Clause =>
1603 if Nkind (Original_Node (I_Node)) =
1604 N_Formal_Package_Declaration
1606 Append (New_Copy_Tree (Formal), Assoc);
1609 Append (Formal, Assoc);
1613 raise Program_Error;
1617 Formal := Saved_Formal;
1618 Next_Non_Pragma (Analyzed_Formal);
1621 if Num_Actuals > Num_Matched then
1622 Error_Msg_Sloc := Sloc (Gen_Unit);
1624 if Present (Selector_Name (Actual)) then
1626 ("unmatched actual&",
1627 Actual, Selector_Name (Actual));
1628 Error_Msg_NE ("\in instantiation of& declared#",
1632 ("unmatched actual in instantiation of& declared#",
1637 elsif Present (Actuals) then
1639 ("too many actuals in generic instantiation", Instantiation_Node);
1642 -- An instantiation freezes all generic actuals. The only exceptions
1643 -- to this are incomplete types and subprograms which are not fully
1644 -- defined at the point of instantiation.
1647 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze);
1649 while Present (Elmt) loop
1650 Freeze_Before (I_Node, Node (Elmt));
1655 -- If there are default subprograms, normalize the tree by adding
1656 -- explicit associations for them. This is required if the instance
1657 -- appears within a generic.
1665 Elmt := First_Elmt (Default_Actuals);
1666 while Present (Elmt) loop
1667 if No (Actuals) then
1668 Actuals := New_List;
1669 Set_Generic_Associations (I_Node, Actuals);
1672 Subp := Node (Elmt);
1674 Make_Generic_Association (Sloc (Subp),
1675 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1676 Explicit_Generic_Actual_Parameter =>
1677 New_Occurrence_Of (Subp, Sloc (Subp)));
1678 Mark_Rewrite_Insertion (New_D);
1679 Append_To (Actuals, New_D);
1684 -- If this is a formal package, normalize the parameter list by adding
1685 -- explicit box associations for the formals that are covered by an
1688 if not Is_Empty_List (Default_Formals) then
1689 Append_List (Default_Formals, Formals);
1693 end Analyze_Associations;
1695 -------------------------------
1696 -- Analyze_Formal_Array_Type --
1697 -------------------------------
1699 procedure Analyze_Formal_Array_Type
1700 (T : in out Entity_Id;
1706 -- Treated like a non-generic array declaration, with additional
1711 if Nkind (Def) = N_Constrained_Array_Definition then
1712 DSS := First (Discrete_Subtype_Definitions (Def));
1713 while Present (DSS) loop
1714 if Nkind_In (DSS, N_Subtype_Indication,
1716 N_Attribute_Reference)
1718 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1725 Array_Type_Declaration (T, Def);
1726 Set_Is_Generic_Type (Base_Type (T));
1728 if Ekind (Component_Type (T)) = E_Incomplete_Type
1729 and then No (Full_View (Component_Type (T)))
1731 Error_Msg_N ("premature usage of incomplete type", Def);
1733 -- Check that range constraint is not allowed on the component type
1734 -- of a generic formal array type (AARM 12.5.3(3))
1736 elsif Is_Internal (Component_Type (T))
1737 and then Present (Subtype_Indication (Component_Definition (Def)))
1738 and then Nkind (Original_Node
1739 (Subtype_Indication (Component_Definition (Def)))) =
1740 N_Subtype_Indication
1743 ("in a formal, a subtype indication can only be "
1744 & "a subtype mark (RM 12.5.3(3))",
1745 Subtype_Indication (Component_Definition (Def)));
1748 end Analyze_Formal_Array_Type;
1750 ---------------------------------------------
1751 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1752 ---------------------------------------------
1754 -- As for other generic types, we create a valid type representation with
1755 -- legal but arbitrary attributes, whose values are never considered
1756 -- static. For all scalar types we introduce an anonymous base type, with
1757 -- the same attributes. We choose the corresponding integer type to be
1758 -- Standard_Integer.
1759 -- Here and in other similar routines, the Sloc of the generated internal
1760 -- type must be the same as the sloc of the defining identifier of the
1761 -- formal type declaration, to provide proper source navigation.
1763 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1767 Loc : constant Source_Ptr := Sloc (Def);
1769 Base : constant Entity_Id :=
1771 (E_Decimal_Fixed_Point_Type,
1773 Sloc (Defining_Identifier (Parent (Def))), 'G');
1775 Int_Base : constant Entity_Id := Standard_Integer;
1776 Delta_Val : constant Ureal := Ureal_1;
1777 Digs_Val : constant Uint := Uint_6;
1779 function Make_Dummy_Bound return Node_Id;
1780 -- Return a properly typed universal real literal to use as a bound
1782 ----------------------
1783 -- Make_Dummy_Bound --
1784 ----------------------
1786 function Make_Dummy_Bound return Node_Id is
1787 Bound : constant Node_Id := Make_Real_Literal (Loc, Ureal_1);
1789 Set_Etype (Bound, Universal_Real);
1791 end Make_Dummy_Bound;
1793 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
1798 Set_Etype (Base, Base);
1799 Set_Size_Info (Base, Int_Base);
1800 Set_RM_Size (Base, RM_Size (Int_Base));
1801 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1802 Set_Digits_Value (Base, Digs_Val);
1803 Set_Delta_Value (Base, Delta_Val);
1804 Set_Small_Value (Base, Delta_Val);
1805 Set_Scalar_Range (Base,
1807 Low_Bound => Make_Dummy_Bound,
1808 High_Bound => Make_Dummy_Bound));
1810 Set_Is_Generic_Type (Base);
1811 Set_Parent (Base, Parent (Def));
1813 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1814 Set_Etype (T, Base);
1815 Set_Size_Info (T, Int_Base);
1816 Set_RM_Size (T, RM_Size (Int_Base));
1817 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1818 Set_Digits_Value (T, Digs_Val);
1819 Set_Delta_Value (T, Delta_Val);
1820 Set_Small_Value (T, Delta_Val);
1821 Set_Scalar_Range (T, Scalar_Range (Base));
1822 Set_Is_Constrained (T);
1824 Check_Restriction (No_Fixed_Point, Def);
1825 end Analyze_Formal_Decimal_Fixed_Point_Type;
1827 -------------------------------------------
1828 -- Analyze_Formal_Derived_Interface_Type --
1829 -------------------------------------------
1831 procedure Analyze_Formal_Derived_Interface_Type
1836 Loc : constant Source_Ptr := Sloc (Def);
1839 -- Rewrite as a type declaration of a derived type. This ensures that
1840 -- the interface list and primitive operations are properly captured.
1843 Make_Full_Type_Declaration (Loc,
1844 Defining_Identifier => T,
1845 Type_Definition => Def));
1847 Set_Is_Generic_Type (T);
1848 end Analyze_Formal_Derived_Interface_Type;
1850 ---------------------------------
1851 -- Analyze_Formal_Derived_Type --
1852 ---------------------------------
1854 procedure Analyze_Formal_Derived_Type
1859 Loc : constant Source_Ptr := Sloc (Def);
1860 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1864 Set_Is_Generic_Type (T);
1866 if Private_Present (Def) then
1868 Make_Private_Extension_Declaration (Loc,
1869 Defining_Identifier => T,
1870 Discriminant_Specifications => Discriminant_Specifications (N),
1871 Unknown_Discriminants_Present => Unk_Disc,
1872 Subtype_Indication => Subtype_Mark (Def),
1873 Interface_List => Interface_List (Def));
1875 Set_Abstract_Present (New_N, Abstract_Present (Def));
1876 Set_Limited_Present (New_N, Limited_Present (Def));
1877 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1881 Make_Full_Type_Declaration (Loc,
1882 Defining_Identifier => T,
1883 Discriminant_Specifications =>
1884 Discriminant_Specifications (Parent (T)),
1886 Make_Derived_Type_Definition (Loc,
1887 Subtype_Indication => Subtype_Mark (Def)));
1889 Set_Abstract_Present
1890 (Type_Definition (New_N), Abstract_Present (Def));
1892 (Type_Definition (New_N), Limited_Present (Def));
1899 if not Is_Composite_Type (T) then
1901 ("unknown discriminants not allowed for elementary types", N);
1903 Set_Has_Unknown_Discriminants (T);
1904 Set_Is_Constrained (T, False);
1908 -- If the parent type has a known size, so does the formal, which makes
1909 -- legal representation clauses that involve the formal.
1911 Set_Size_Known_At_Compile_Time
1912 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1913 end Analyze_Formal_Derived_Type;
1915 ----------------------------------
1916 -- Analyze_Formal_Discrete_Type --
1917 ----------------------------------
1919 -- The operations defined for a discrete types are those of an enumeration
1920 -- type. The size is set to an arbitrary value, for use in analyzing the
1923 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1924 Loc : constant Source_Ptr := Sloc (Def);
1928 Base : constant Entity_Id :=
1930 (E_Floating_Point_Type, Current_Scope,
1931 Sloc (Defining_Identifier (Parent (Def))), 'G');
1935 Set_Ekind (T, E_Enumeration_Subtype);
1936 Set_Etype (T, Base);
1939 Set_Is_Generic_Type (T);
1940 Set_Is_Constrained (T);
1942 -- For semantic analysis, the bounds of the type must be set to some
1943 -- non-static value. The simplest is to create attribute nodes for those
1944 -- bounds, that refer to the type itself. These bounds are never
1945 -- analyzed but serve as place-holders.
1948 Make_Attribute_Reference (Loc,
1949 Attribute_Name => Name_First,
1950 Prefix => New_Occurrence_Of (T, Loc));
1954 Make_Attribute_Reference (Loc,
1955 Attribute_Name => Name_Last,
1956 Prefix => New_Occurrence_Of (T, Loc));
1959 Set_Scalar_Range (T,
1964 Set_Ekind (Base, E_Enumeration_Type);
1965 Set_Etype (Base, Base);
1966 Init_Size (Base, 8);
1967 Init_Alignment (Base);
1968 Set_Is_Generic_Type (Base);
1969 Set_Scalar_Range (Base, Scalar_Range (T));
1970 Set_Parent (Base, Parent (Def));
1971 end Analyze_Formal_Discrete_Type;
1973 ----------------------------------
1974 -- Analyze_Formal_Floating_Type --
1975 ---------------------------------
1977 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1978 Base : constant Entity_Id :=
1980 (E_Floating_Point_Type, Current_Scope,
1981 Sloc (Defining_Identifier (Parent (Def))), 'G');
1984 -- The various semantic attributes are taken from the predefined type
1985 -- Float, just so that all of them are initialized. Their values are
1986 -- never used because no constant folding or expansion takes place in
1987 -- the generic itself.
1990 Set_Ekind (T, E_Floating_Point_Subtype);
1991 Set_Etype (T, Base);
1992 Set_Size_Info (T, (Standard_Float));
1993 Set_RM_Size (T, RM_Size (Standard_Float));
1994 Set_Digits_Value (T, Digits_Value (Standard_Float));
1995 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1996 Set_Is_Constrained (T);
1998 Set_Is_Generic_Type (Base);
1999 Set_Etype (Base, Base);
2000 Set_Size_Info (Base, (Standard_Float));
2001 Set_RM_Size (Base, RM_Size (Standard_Float));
2002 Set_Digits_Value (Base, Digits_Value (Standard_Float));
2003 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
2004 Set_Parent (Base, Parent (Def));
2006 Check_Restriction (No_Floating_Point, Def);
2007 end Analyze_Formal_Floating_Type;
2009 -----------------------------------
2010 -- Analyze_Formal_Interface_Type;--
2011 -----------------------------------
2013 procedure Analyze_Formal_Interface_Type
2018 Loc : constant Source_Ptr := Sloc (N);
2023 Make_Full_Type_Declaration (Loc,
2024 Defining_Identifier => T,
2025 Type_Definition => Def);
2029 Set_Is_Generic_Type (T);
2030 end Analyze_Formal_Interface_Type;
2032 ---------------------------------
2033 -- Analyze_Formal_Modular_Type --
2034 ---------------------------------
2036 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
2038 -- Apart from their entity kind, generic modular types are treated like
2039 -- signed integer types, and have the same attributes.
2041 Analyze_Formal_Signed_Integer_Type (T, Def);
2042 Set_Ekind (T, E_Modular_Integer_Subtype);
2043 Set_Ekind (Etype (T), E_Modular_Integer_Type);
2045 end Analyze_Formal_Modular_Type;
2047 ---------------------------------------
2048 -- Analyze_Formal_Object_Declaration --
2049 ---------------------------------------
2051 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
2052 E : constant Node_Id := Default_Expression (N);
2053 Id : constant Node_Id := Defining_Identifier (N);
2060 -- Determine the mode of the formal object
2062 if Out_Present (N) then
2063 K := E_Generic_In_Out_Parameter;
2065 if not In_Present (N) then
2066 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
2070 K := E_Generic_In_Parameter;
2073 if Present (Subtype_Mark (N)) then
2074 Find_Type (Subtype_Mark (N));
2075 T := Entity (Subtype_Mark (N));
2077 -- Verify that there is no redundant null exclusion
2079 if Null_Exclusion_Present (N) then
2080 if not Is_Access_Type (T) then
2082 ("null exclusion can only apply to an access type", N);
2084 elsif Can_Never_Be_Null (T) then
2086 ("`NOT NULL` not allowed (& already excludes null)",
2091 -- Ada 2005 (AI-423): Formal object with an access definition
2094 Check_Access_Definition (N);
2095 T := Access_Definition
2097 N => Access_Definition (N));
2100 if Ekind (T) = E_Incomplete_Type then
2102 Error_Node : Node_Id;
2105 if Present (Subtype_Mark (N)) then
2106 Error_Node := Subtype_Mark (N);
2108 Check_Access_Definition (N);
2109 Error_Node := Access_Definition (N);
2112 Error_Msg_N ("premature usage of incomplete type", Error_Node);
2116 if K = E_Generic_In_Parameter then
2118 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2120 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
2122 ("generic formal of mode IN must not be of limited type", N);
2123 Explain_Limited_Type (T, N);
2126 if Is_Abstract_Type (T) then
2128 ("generic formal of mode IN must not be of abstract type", N);
2132 Preanalyze_Spec_Expression (E, T);
2134 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
2136 ("initialization not allowed for limited types", E);
2137 Explain_Limited_Type (T, E);
2144 -- Case of generic IN OUT parameter
2147 -- If the formal has an unconstrained type, construct its actual
2148 -- subtype, as is done for subprogram formals. In this fashion, all
2149 -- its uses can refer to specific bounds.
2154 if (Is_Array_Type (T)
2155 and then not Is_Constrained (T))
2157 (Ekind (T) = E_Record_Type
2158 and then Has_Discriminants (T))
2161 Non_Freezing_Ref : constant Node_Id :=
2162 New_Occurrence_Of (Id, Sloc (Id));
2166 -- Make sure the actual subtype doesn't generate bogus freezing
2168 Set_Must_Not_Freeze (Non_Freezing_Ref);
2169 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
2170 Insert_Before_And_Analyze (N, Decl);
2171 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
2174 Set_Actual_Subtype (Id, T);
2179 ("initialization not allowed for `IN OUT` formals", N);
2183 if Has_Aspects (N) then
2184 Analyze_Aspect_Specifications (N, Id);
2186 end Analyze_Formal_Object_Declaration;
2188 ----------------------------------------------
2189 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2190 ----------------------------------------------
2192 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2196 Loc : constant Source_Ptr := Sloc (Def);
2197 Base : constant Entity_Id :=
2199 (E_Ordinary_Fixed_Point_Type, Current_Scope,
2200 Sloc (Defining_Identifier (Parent (Def))), 'G');
2203 -- The semantic attributes are set for completeness only, their values
2204 -- will never be used, since all properties of the type are non-static.
2207 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
2208 Set_Etype (T, Base);
2209 Set_Size_Info (T, Standard_Integer);
2210 Set_RM_Size (T, RM_Size (Standard_Integer));
2211 Set_Small_Value (T, Ureal_1);
2212 Set_Delta_Value (T, Ureal_1);
2213 Set_Scalar_Range (T,
2215 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
2216 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
2217 Set_Is_Constrained (T);
2219 Set_Is_Generic_Type (Base);
2220 Set_Etype (Base, Base);
2221 Set_Size_Info (Base, Standard_Integer);
2222 Set_RM_Size (Base, RM_Size (Standard_Integer));
2223 Set_Small_Value (Base, Ureal_1);
2224 Set_Delta_Value (Base, Ureal_1);
2225 Set_Scalar_Range (Base, Scalar_Range (T));
2226 Set_Parent (Base, Parent (Def));
2228 Check_Restriction (No_Fixed_Point, Def);
2229 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2231 ----------------------------------------
2232 -- Analyze_Formal_Package_Declaration --
2233 ----------------------------------------
2235 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2236 Loc : constant Source_Ptr := Sloc (N);
2237 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2239 Gen_Id : constant Node_Id := Name (N);
2241 Gen_Unit : Entity_Id;
2243 Parent_Installed : Boolean := False;
2245 Parent_Instance : Entity_Id;
2246 Renaming_In_Par : Entity_Id;
2247 Associations : Boolean := True;
2249 Vis_Prims_List : Elist_Id := No_Elist;
2250 -- List of primitives made temporarily visible in the instantiation
2251 -- to match the visibility of the formal type
2253 function Build_Local_Package return Node_Id;
2254 -- The formal package is rewritten so that its parameters are replaced
2255 -- with corresponding declarations. For parameters with bona fide
2256 -- associations these declarations are created by Analyze_Associations
2257 -- as for a regular instantiation. For boxed parameters, we preserve
2258 -- the formal declarations and analyze them, in order to introduce
2259 -- entities of the right kind in the environment of the formal.
2261 -------------------------
2262 -- Build_Local_Package --
2263 -------------------------
2265 function Build_Local_Package return Node_Id is
2267 Pack_Decl : Node_Id;
2270 -- Within the formal, the name of the generic package is a renaming
2271 -- of the formal (as for a regular instantiation).
2274 Make_Package_Declaration (Loc,
2277 (Specification (Original_Node (Gen_Decl)),
2278 Empty, Instantiating => True));
2280 Renaming := Make_Package_Renaming_Declaration (Loc,
2281 Defining_Unit_Name =>
2282 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2283 Name => New_Occurrence_Of (Formal, Loc));
2285 if Nkind (Gen_Id) = N_Identifier
2286 and then Chars (Gen_Id) = Chars (Pack_Id)
2289 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2292 -- If the formal is declared with a box, or with an others choice,
2293 -- create corresponding declarations for all entities in the formal
2294 -- part, so that names with the proper types are available in the
2295 -- specification of the formal package.
2297 -- On the other hand, if there are no associations, then all the
2298 -- formals must have defaults, and this will be checked by the
2299 -- call to Analyze_Associations.
2302 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2305 Formal_Decl : Node_Id;
2308 -- TBA : for a formal package, need to recurse ???
2313 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2314 while Present (Formal_Decl) loop
2316 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2321 -- If generic associations are present, use Analyze_Associations to
2322 -- create the proper renaming declarations.
2326 Act_Tree : constant Node_Id :=
2328 (Original_Node (Gen_Decl), Empty,
2329 Instantiating => True);
2332 Generic_Renamings.Set_Last (0);
2333 Generic_Renamings_HTable.Reset;
2334 Instantiation_Node := N;
2337 Analyze_Associations
2338 (I_Node => Original_Node (N),
2339 Formals => Generic_Formal_Declarations (Act_Tree),
2340 F_Copy => Generic_Formal_Declarations (Gen_Decl));
2342 Vis_Prims_List := Check_Hidden_Primitives (Decls);
2346 Append (Renaming, To => Decls);
2348 -- Add generated declarations ahead of local declarations in
2351 if No (Visible_Declarations (Specification (Pack_Decl))) then
2352 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2355 (First (Visible_Declarations (Specification (Pack_Decl))),
2360 end Build_Local_Package;
2362 -- Start of processing for Analyze_Formal_Package_Declaration
2365 Check_Text_IO_Special_Unit (Gen_Id);
2368 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2369 Gen_Unit := Entity (Gen_Id);
2371 -- Check for a formal package that is a package renaming
2373 if Present (Renamed_Object (Gen_Unit)) then
2375 -- Indicate that unit is used, before replacing it with renamed
2376 -- entity for use below.
2378 if In_Extended_Main_Source_Unit (N) then
2379 Set_Is_Instantiated (Gen_Unit);
2380 Generate_Reference (Gen_Unit, N);
2383 Gen_Unit := Renamed_Object (Gen_Unit);
2386 if Ekind (Gen_Unit) /= E_Generic_Package then
2387 Error_Msg_N ("expect generic package name", Gen_Id);
2391 elsif Gen_Unit = Current_Scope then
2393 ("generic package cannot be used as a formal package of itself",
2398 elsif In_Open_Scopes (Gen_Unit) then
2399 if Is_Compilation_Unit (Gen_Unit)
2400 and then Is_Child_Unit (Current_Scope)
2402 -- Special-case the error when the formal is a parent, and
2403 -- continue analysis to minimize cascaded errors.
2406 ("generic parent cannot be used as formal package "
2407 & "of a child unit",
2412 ("generic package cannot be used as a formal package "
2420 -- Check that name of formal package does not hide name of generic,
2421 -- or its leading prefix. This check must be done separately because
2422 -- the name of the generic has already been analyzed.
2425 Gen_Name : Entity_Id;
2429 while Nkind (Gen_Name) = N_Expanded_Name loop
2430 Gen_Name := Prefix (Gen_Name);
2433 if Chars (Gen_Name) = Chars (Pack_Id) then
2435 ("& is hidden within declaration of formal package",
2441 or else No (Generic_Associations (N))
2442 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2444 Associations := False;
2447 -- If there are no generic associations, the generic parameters appear
2448 -- as local entities and are instantiated like them. We copy the generic
2449 -- package declaration as if it were an instantiation, and analyze it
2450 -- like a regular package, except that we treat the formals as
2451 -- additional visible components.
2453 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2455 if In_Extended_Main_Source_Unit (N) then
2456 Set_Is_Instantiated (Gen_Unit);
2457 Generate_Reference (Gen_Unit, N);
2460 Formal := New_Copy (Pack_Id);
2461 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2464 -- Make local generic without formals. The formals will be replaced
2465 -- with internal declarations.
2467 New_N := Build_Local_Package;
2469 -- If there are errors in the parameter list, Analyze_Associations
2470 -- raises Instantiation_Error. Patch the declaration to prevent
2471 -- further exception propagation.
2474 when Instantiation_Error =>
2476 Enter_Name (Formal);
2477 Set_Ekind (Formal, E_Variable);
2478 Set_Etype (Formal, Any_Type);
2479 Restore_Hidden_Primitives (Vis_Prims_List);
2481 if Parent_Installed then
2489 Set_Defining_Unit_Name (Specification (New_N), Formal);
2490 Set_Generic_Parent (Specification (N), Gen_Unit);
2491 Set_Instance_Env (Gen_Unit, Formal);
2492 Set_Is_Generic_Instance (Formal);
2494 Enter_Name (Formal);
2495 Set_Ekind (Formal, E_Package);
2496 Set_Etype (Formal, Standard_Void_Type);
2497 Set_Inner_Instances (Formal, New_Elmt_List);
2498 Push_Scope (Formal);
2500 if Is_Child_Unit (Gen_Unit)
2501 and then Parent_Installed
2503 -- Similarly, we have to make the name of the formal visible in the
2504 -- parent instance, to resolve properly fully qualified names that
2505 -- may appear in the generic unit. The parent instance has been
2506 -- placed on the scope stack ahead of the current scope.
2508 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2511 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2512 Set_Ekind (Renaming_In_Par, E_Package);
2513 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2514 Set_Scope (Renaming_In_Par, Parent_Instance);
2515 Set_Parent (Renaming_In_Par, Parent (Formal));
2516 Set_Renamed_Object (Renaming_In_Par, Formal);
2517 Append_Entity (Renaming_In_Par, Parent_Instance);
2520 Analyze (Specification (N));
2522 -- The formals for which associations are provided are not visible
2523 -- outside of the formal package. The others are still declared by a
2524 -- formal parameter declaration.
2526 -- If there are no associations, the only local entity to hide is the
2527 -- generated package renaming itself.
2533 E := First_Entity (Formal);
2534 while Present (E) loop
2536 and then not Is_Generic_Formal (E)
2541 if Ekind (E) = E_Package
2542 and then Renamed_Entity (E) = Formal
2552 End_Package_Scope (Formal);
2553 Restore_Hidden_Primitives (Vis_Prims_List);
2555 if Parent_Installed then
2561 -- Inside the generic unit, the formal package is a regular package, but
2562 -- no body is needed for it. Note that after instantiation, the defining
2563 -- unit name we need is in the new tree and not in the original (see
2564 -- Package_Instantiation). A generic formal package is an instance, and
2565 -- can be used as an actual for an inner instance.
2567 Set_Has_Completion (Formal, True);
2569 -- Add semantic information to the original defining identifier.
2572 Set_Ekind (Pack_Id, E_Package);
2573 Set_Etype (Pack_Id, Standard_Void_Type);
2574 Set_Scope (Pack_Id, Scope (Formal));
2575 Set_Has_Completion (Pack_Id, True);
2578 if Has_Aspects (N) then
2579 Analyze_Aspect_Specifications (N, Pack_Id);
2581 end Analyze_Formal_Package_Declaration;
2583 ---------------------------------
2584 -- Analyze_Formal_Private_Type --
2585 ---------------------------------
2587 procedure Analyze_Formal_Private_Type
2593 New_Private_Type (N, T, Def);
2595 -- Set the size to an arbitrary but legal value
2597 Set_Size_Info (T, Standard_Integer);
2598 Set_RM_Size (T, RM_Size (Standard_Integer));
2599 end Analyze_Formal_Private_Type;
2601 ------------------------------------
2602 -- Analyze_Formal_Incomplete_Type --
2603 ------------------------------------
2605 procedure Analyze_Formal_Incomplete_Type
2611 Set_Ekind (T, E_Incomplete_Type);
2613 Set_Private_Dependents (T, New_Elmt_List);
2615 if Tagged_Present (Def) then
2616 Set_Is_Tagged_Type (T);
2617 Make_Class_Wide_Type (T);
2618 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2620 end Analyze_Formal_Incomplete_Type;
2622 ----------------------------------------
2623 -- Analyze_Formal_Signed_Integer_Type --
2624 ----------------------------------------
2626 procedure Analyze_Formal_Signed_Integer_Type
2630 Base : constant Entity_Id :=
2632 (E_Signed_Integer_Type,
2634 Sloc (Defining_Identifier (Parent (Def))), 'G');
2639 Set_Ekind (T, E_Signed_Integer_Subtype);
2640 Set_Etype (T, Base);
2641 Set_Size_Info (T, Standard_Integer);
2642 Set_RM_Size (T, RM_Size (Standard_Integer));
2643 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2644 Set_Is_Constrained (T);
2646 Set_Is_Generic_Type (Base);
2647 Set_Size_Info (Base, Standard_Integer);
2648 Set_RM_Size (Base, RM_Size (Standard_Integer));
2649 Set_Etype (Base, Base);
2650 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2651 Set_Parent (Base, Parent (Def));
2652 end Analyze_Formal_Signed_Integer_Type;
2654 -------------------------------------------
2655 -- Analyze_Formal_Subprogram_Declaration --
2656 -------------------------------------------
2658 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2659 Spec : constant Node_Id := Specification (N);
2660 Def : constant Node_Id := Default_Name (N);
2661 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2669 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2670 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2674 Analyze_Subprogram_Declaration (N);
2675 Set_Is_Formal_Subprogram (Nam);
2676 Set_Has_Completion (Nam);
2678 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2679 Set_Is_Abstract_Subprogram (Nam);
2680 Set_Is_Dispatching_Operation (Nam);
2683 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2685 if No (Ctrl_Type) then
2687 ("abstract formal subprogram must have a controlling type",
2690 elsif Ada_Version >= Ada_2012
2691 and then Is_Incomplete_Type (Ctrl_Type)
2694 ("controlling type of abstract formal subprogram cannot " &
2695 "be incomplete type", N, Ctrl_Type);
2698 Check_Controlling_Formals (Ctrl_Type, Nam);
2703 -- Default name is resolved at the point of instantiation
2705 if Box_Present (N) then
2708 -- Else default is bound at the point of generic declaration
2710 elsif Present (Def) then
2711 if Nkind (Def) = N_Operator_Symbol then
2712 Find_Direct_Name (Def);
2714 elsif Nkind (Def) /= N_Attribute_Reference then
2718 -- For an attribute reference, analyze the prefix and verify
2719 -- that it has the proper profile for the subprogram.
2721 Analyze (Prefix (Def));
2722 Valid_Default_Attribute (Nam, Def);
2726 -- Default name may be overloaded, in which case the interpretation
2727 -- with the correct profile must be selected, as for a renaming.
2728 -- If the definition is an indexed component, it must denote a
2729 -- member of an entry family. If it is a selected component, it
2730 -- can be a protected operation.
2732 if Etype (Def) = Any_Type then
2735 elsif Nkind (Def) = N_Selected_Component then
2736 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2737 Error_Msg_N ("expect valid subprogram name as default", Def);
2740 elsif Nkind (Def) = N_Indexed_Component then
2741 if Is_Entity_Name (Prefix (Def)) then
2742 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2743 Error_Msg_N ("expect valid subprogram name as default", Def);
2746 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2747 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2750 Error_Msg_N ("expect valid subprogram name as default", Def);
2754 Error_Msg_N ("expect valid subprogram name as default", Def);
2758 elsif Nkind (Def) = N_Character_Literal then
2760 -- Needs some type checks: subprogram should be parameterless???
2762 Resolve (Def, (Etype (Nam)));
2764 elsif not Is_Entity_Name (Def)
2765 or else not Is_Overloadable (Entity (Def))
2767 Error_Msg_N ("expect valid subprogram name as default", Def);
2770 elsif not Is_Overloaded (Def) then
2771 Subp := Entity (Def);
2774 Error_Msg_N ("premature usage of formal subprogram", Def);
2776 elsif not Entity_Matches_Spec (Subp, Nam) then
2777 Error_Msg_N ("no visible entity matches specification", Def);
2780 -- More than one interpretation, so disambiguate as for a renaming
2785 I1 : Interp_Index := 0;
2791 Get_First_Interp (Def, I, It);
2792 while Present (It.Nam) loop
2793 if Entity_Matches_Spec (It.Nam, Nam) then
2794 if Subp /= Any_Id then
2795 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2797 if It1 = No_Interp then
2798 Error_Msg_N ("ambiguous default subprogram", Def);
2811 Get_Next_Interp (I, It);
2815 if Subp /= Any_Id then
2817 -- Subprogram found, generate reference to it
2819 Set_Entity (Def, Subp);
2820 Generate_Reference (Subp, Def);
2823 Error_Msg_N ("premature usage of formal subprogram", Def);
2825 elsif Ekind (Subp) /= E_Operator then
2826 Check_Mode_Conformant (Subp, Nam);
2830 Error_Msg_N ("no visible subprogram matches specification", N);
2836 if Has_Aspects (N) then
2837 Analyze_Aspect_Specifications (N, Nam);
2840 end Analyze_Formal_Subprogram_Declaration;
2842 -------------------------------------
2843 -- Analyze_Formal_Type_Declaration --
2844 -------------------------------------
2846 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2847 Def : constant Node_Id := Formal_Type_Definition (N);
2851 T := Defining_Identifier (N);
2853 if Present (Discriminant_Specifications (N))
2854 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2857 ("discriminants not allowed for this formal type", T);
2860 -- Enter the new name, and branch to specific routine
2863 when N_Formal_Private_Type_Definition =>
2864 Analyze_Formal_Private_Type (N, T, Def);
2866 when N_Formal_Derived_Type_Definition =>
2867 Analyze_Formal_Derived_Type (N, T, Def);
2869 when N_Formal_Incomplete_Type_Definition =>
2870 Analyze_Formal_Incomplete_Type (T, Def);
2872 when N_Formal_Discrete_Type_Definition =>
2873 Analyze_Formal_Discrete_Type (T, Def);
2875 when N_Formal_Signed_Integer_Type_Definition =>
2876 Analyze_Formal_Signed_Integer_Type (T, Def);
2878 when N_Formal_Modular_Type_Definition =>
2879 Analyze_Formal_Modular_Type (T, Def);
2881 when N_Formal_Floating_Point_Definition =>
2882 Analyze_Formal_Floating_Type (T, Def);
2884 when N_Formal_Ordinary_Fixed_Point_Definition =>
2885 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2887 when N_Formal_Decimal_Fixed_Point_Definition =>
2888 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2890 when N_Array_Type_Definition =>
2891 Analyze_Formal_Array_Type (T, Def);
2893 when N_Access_To_Object_Definition |
2894 N_Access_Function_Definition |
2895 N_Access_Procedure_Definition =>
2896 Analyze_Generic_Access_Type (T, Def);
2898 -- Ada 2005: a interface declaration is encoded as an abstract
2899 -- record declaration or a abstract type derivation.
2901 when N_Record_Definition =>
2902 Analyze_Formal_Interface_Type (N, T, Def);
2904 when N_Derived_Type_Definition =>
2905 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2911 raise Program_Error;
2915 Set_Is_Generic_Type (T);
2917 if Has_Aspects (N) then
2918 Analyze_Aspect_Specifications (N, T);
2920 end Analyze_Formal_Type_Declaration;
2922 ------------------------------------
2923 -- Analyze_Function_Instantiation --
2924 ------------------------------------
2926 procedure Analyze_Function_Instantiation (N : Node_Id) is
2928 Analyze_Subprogram_Instantiation (N, E_Function);
2929 end Analyze_Function_Instantiation;
2931 ---------------------------------
2932 -- Analyze_Generic_Access_Type --
2933 ---------------------------------
2935 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2939 if Nkind (Def) = N_Access_To_Object_Definition then
2940 Access_Type_Declaration (T, Def);
2942 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2943 and then No (Full_View (Designated_Type (T)))
2944 and then not Is_Generic_Type (Designated_Type (T))
2946 Error_Msg_N ("premature usage of incomplete type", Def);
2948 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2950 ("only a subtype mark is allowed in a formal", Def);
2954 Access_Subprogram_Declaration (T, Def);
2956 end Analyze_Generic_Access_Type;
2958 ---------------------------------
2959 -- Analyze_Generic_Formal_Part --
2960 ---------------------------------
2962 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2963 Gen_Parm_Decl : Node_Id;
2966 -- The generic formals are processed in the scope of the generic unit,
2967 -- where they are immediately visible. The scope is installed by the
2970 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2972 while Present (Gen_Parm_Decl) loop
2973 Analyze (Gen_Parm_Decl);
2974 Next (Gen_Parm_Decl);
2977 Generate_Reference_To_Generic_Formals (Current_Scope);
2978 end Analyze_Generic_Formal_Part;
2980 ------------------------------------------
2981 -- Analyze_Generic_Package_Declaration --
2982 ------------------------------------------
2984 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2985 Loc : constant Source_Ptr := Sloc (N);
2988 Save_Parent : Node_Id;
2990 Decls : constant List_Id :=
2991 Visible_Declarations (Specification (N));
2995 Check_SPARK_Restriction ("generic is not allowed", N);
2997 -- We introduce a renaming of the enclosing package, to have a usable
2998 -- entity as the prefix of an expanded name for a local entity of the
2999 -- form Par.P.Q, where P is the generic package. This is because a local
3000 -- entity named P may hide it, so that the usual visibility rules in
3001 -- the instance will not resolve properly.
3004 Make_Package_Renaming_Declaration (Loc,
3005 Defining_Unit_Name =>
3006 Make_Defining_Identifier (Loc,
3007 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
3008 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
3010 if Present (Decls) then
3011 Decl := First (Decls);
3012 while Present (Decl)
3013 and then Nkind (Decl) = N_Pragma
3018 if Present (Decl) then
3019 Insert_Before (Decl, Renaming);
3021 Append (Renaming, Visible_Declarations (Specification (N)));
3025 Set_Visible_Declarations (Specification (N), New_List (Renaming));
3028 -- Create copy of generic unit, and save for instantiation. If the unit
3029 -- is a child unit, do not copy the specifications for the parent, which
3030 -- are not part of the generic tree.
3032 Save_Parent := Parent_Spec (N);
3033 Set_Parent_Spec (N, Empty);
3035 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3036 Set_Parent_Spec (New_N, Save_Parent);
3039 -- Once the contents of the generic copy and the template are swapped,
3040 -- do the same for their respective aspect specifications.
3042 Exchange_Aspects (N, New_N);
3043 Id := Defining_Entity (N);
3044 Generate_Definition (Id);
3046 -- Expansion is not applied to generic units
3051 Set_Ekind (Id, E_Generic_Package);
3052 Set_Etype (Id, Standard_Void_Type);
3053 Set_Contract (Id, Make_Contract (Sloc (Id)));
3055 -- Analyze aspects now, so that generated pragmas appear in the
3056 -- declarations before building and analyzing the generic copy.
3058 if Has_Aspects (N) then
3059 Analyze_Aspect_Specifications (N, Id);
3063 Enter_Generic_Scope (Id);
3064 Set_Inner_Instances (Id, New_Elmt_List);
3066 Set_Categorization_From_Pragmas (N);
3067 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3069 -- Link the declaration of the generic homonym in the generic copy to
3070 -- the package it renames, so that it is always resolved properly.
3072 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
3073 Set_Entity (Associated_Node (Name (Renaming)), Id);
3075 -- For a library unit, we have reconstructed the entity for the unit,
3076 -- and must reset it in the library tables.
3078 if Nkind (Parent (N)) = N_Compilation_Unit then
3079 Set_Cunit_Entity (Current_Sem_Unit, Id);
3082 Analyze_Generic_Formal_Part (N);
3084 -- After processing the generic formals, analysis proceeds as for a
3085 -- non-generic package.
3087 Analyze (Specification (N));
3089 Validate_Categorization_Dependency (N, Id);
3093 End_Package_Scope (Id);
3094 Exit_Generic_Scope (Id);
3096 if Nkind (Parent (N)) /= N_Compilation_Unit then
3097 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
3098 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
3099 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
3102 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3103 Validate_RT_RAT_Component (N);
3105 -- If this is a spec without a body, check that generic parameters
3108 if not Body_Required (Parent (N)) then
3109 Check_References (Id);
3112 end Analyze_Generic_Package_Declaration;
3114 --------------------------------------------
3115 -- Analyze_Generic_Subprogram_Declaration --
3116 --------------------------------------------
3118 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
3123 Result_Type : Entity_Id;
3124 Save_Parent : Node_Id;
3128 Check_SPARK_Restriction ("generic is not allowed", N);
3130 -- Create copy of generic unit, and save for instantiation. If the unit
3131 -- is a child unit, do not copy the specifications for the parent, which
3132 -- are not part of the generic tree.
3134 Save_Parent := Parent_Spec (N);
3135 Set_Parent_Spec (N, Empty);
3137 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3138 Set_Parent_Spec (New_N, Save_Parent);
3141 Check_SPARK_Mode_In_Generic (N);
3143 -- The aspect specifications are not attached to the tree, and must
3144 -- be copied and attached to the generic copy explicitly.
3146 if Present (Aspect_Specifications (New_N)) then
3148 Aspects : constant List_Id := Aspect_Specifications (N);
3150 Set_Has_Aspects (N, False);
3151 Move_Aspects (New_N, To => N);
3152 Set_Has_Aspects (Original_Node (N), False);
3153 Set_Aspect_Specifications (Original_Node (N), Aspects);
3157 Spec := Specification (N);
3158 Id := Defining_Entity (Spec);
3159 Generate_Definition (Id);
3160 Set_Contract (Id, Make_Contract (Sloc (Id)));
3162 if Nkind (Id) = N_Defining_Operator_Symbol then
3164 ("operator symbol not allowed for generic subprogram", Id);
3171 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
3173 Enter_Generic_Scope (Id);
3174 Set_Inner_Instances (Id, New_Elmt_List);
3175 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3177 Analyze_Generic_Formal_Part (N);
3179 Formals := Parameter_Specifications (Spec);
3181 if Present (Formals) then
3182 Process_Formals (Formals, Spec);
3185 if Nkind (Spec) = N_Function_Specification then
3186 Set_Ekind (Id, E_Generic_Function);
3188 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
3189 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
3190 Set_Etype (Id, Result_Type);
3192 -- Check restriction imposed by AI05-073: a generic function
3193 -- cannot return an abstract type or an access to such.
3195 -- This is a binding interpretation should it apply to earlier
3196 -- versions of Ada as well as Ada 2012???
3198 if Is_Abstract_Type (Designated_Type (Result_Type))
3199 and then Ada_Version >= Ada_2012
3201 Error_Msg_N ("generic function cannot have an access result"
3202 & " that designates an abstract type", Spec);
3206 Find_Type (Result_Definition (Spec));
3207 Typ := Entity (Result_Definition (Spec));
3209 if Is_Abstract_Type (Typ)
3210 and then Ada_Version >= Ada_2012
3213 ("generic function cannot have abstract result type", Spec);
3216 -- If a null exclusion is imposed on the result type, then create
3217 -- a null-excluding itype (an access subtype) and use it as the
3218 -- function's Etype.
3220 if Is_Access_Type (Typ)
3221 and then Null_Exclusion_Present (Spec)
3224 Create_Null_Excluding_Itype
3226 Related_Nod => Spec,
3227 Scope_Id => Defining_Unit_Name (Spec)));
3229 Set_Etype (Id, Typ);
3234 Set_Ekind (Id, E_Generic_Procedure);
3235 Set_Etype (Id, Standard_Void_Type);
3238 -- For a library unit, we have reconstructed the entity for the unit,
3239 -- and must reset it in the library tables. We also make sure that
3240 -- Body_Required is set properly in the original compilation unit node.
3242 if Nkind (Parent (N)) = N_Compilation_Unit then
3243 Set_Cunit_Entity (Current_Sem_Unit, Id);
3244 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3247 Set_Categorization_From_Pragmas (N);
3248 Validate_Categorization_Dependency (N, Id);
3250 Save_Global_References (Original_Node (N));
3252 -- For ASIS purposes, convert any postcondition, precondition pragmas
3253 -- into aspects, if N is not a compilation unit by itself, in order to
3254 -- enable the analysis of expressions inside the corresponding PPC
3257 if ASIS_Mode and then Is_List_Member (N) then
3258 Make_Aspect_For_PPC_In_Gen_Sub_Decl (N);
3261 -- To capture global references, analyze the expressions of aspects,
3262 -- and propagate information to original tree. Note that in this case
3263 -- analysis of attributes is not delayed until the freeze point.
3265 -- It seems very hard to recreate the proper visibility of the generic
3266 -- subprogram at a later point because the analysis of an aspect may
3267 -- create pragmas after the generic copies have been made ???
3269 if Has_Aspects (N) then
3274 Aspect := First (Aspect_Specifications (N));
3275 while Present (Aspect) loop
3276 if Get_Aspect_Id (Aspect) /= Aspect_Warnings
3277 and then Present (Expression (Aspect))
3279 Analyze (Expression (Aspect));
3285 Aspect := First (Aspect_Specifications (Original_Node (N)));
3286 while Present (Aspect) loop
3287 if Present (Expression (Aspect)) then
3288 Save_Global_References (Expression (Aspect));
3298 Exit_Generic_Scope (Id);
3299 Generate_Reference_To_Formals (Id);
3301 List_Inherited_Pre_Post_Aspects (Id);
3302 end Analyze_Generic_Subprogram_Declaration;
3304 -----------------------------------
3305 -- Analyze_Package_Instantiation --
3306 -----------------------------------
3308 procedure Analyze_Package_Instantiation (N : Node_Id) is
3309 Loc : constant Source_Ptr := Sloc (N);
3310 Gen_Id : constant Node_Id := Name (N);
3313 Act_Decl_Name : Node_Id;
3314 Act_Decl_Id : Entity_Id;
3319 Gen_Unit : Entity_Id;
3321 Is_Actual_Pack : constant Boolean :=
3322 Is_Internal (Defining_Entity (N));
3324 Env_Installed : Boolean := False;
3325 Parent_Installed : Boolean := False;
3326 Renaming_List : List_Id;
3327 Unit_Renaming : Node_Id;
3328 Needs_Body : Boolean;
3329 Inline_Now : Boolean := False;
3331 Save_Style_Check : constant Boolean := Style_Check;
3332 -- Save style check mode for restore on exit
3334 procedure Delay_Descriptors (E : Entity_Id);
3335 -- Delay generation of subprogram descriptors for given entity
3337 function Might_Inline_Subp return Boolean;
3338 -- If inlining is active and the generic contains inlined subprograms,
3339 -- we instantiate the body. This may cause superfluous instantiations,
3340 -- but it is simpler than detecting the need for the body at the point
3341 -- of inlining, when the context of the instance is not available.
3343 function Must_Inline_Subp return Boolean;
3344 -- If inlining is active and the generic contains inlined subprograms,
3345 -- return True if some of the inlined subprograms must be inlined by
3348 -----------------------
3349 -- Delay_Descriptors --
3350 -----------------------
3352 procedure Delay_Descriptors (E : Entity_Id) is
3354 if not Delay_Subprogram_Descriptors (E) then
3355 Set_Delay_Subprogram_Descriptors (E);
3356 Pending_Descriptor.Append (E);
3358 end Delay_Descriptors;
3360 -----------------------
3361 -- Might_Inline_Subp --
3362 -----------------------
3364 function Might_Inline_Subp return Boolean is
3368 if not Inline_Processing_Required then
3372 E := First_Entity (Gen_Unit);
3373 while Present (E) loop
3374 if Is_Subprogram (E)
3375 and then Is_Inlined (E)
3385 end Might_Inline_Subp;
3387 ----------------------
3388 -- Must_Inline_Subp --
3389 ----------------------
3391 function Must_Inline_Subp return Boolean is
3395 if not Inline_Processing_Required then
3399 E := First_Entity (Gen_Unit);
3400 while Present (E) loop
3401 if Is_Subprogram (E)
3402 and then Is_Inlined (E)
3403 and then Must_Inline (E)
3413 end Must_Inline_Subp;
3415 -- Local declarations
3417 Vis_Prims_List : Elist_Id := No_Elist;
3418 -- List of primitives made temporarily visible in the instantiation
3419 -- to match the visibility of the formal type
3421 -- Start of processing for Analyze_Package_Instantiation
3424 Check_SPARK_Restriction ("generic is not allowed", N);
3426 -- Very first thing: apply the special kludge for Text_IO processing
3427 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3429 Check_Text_IO_Special_Unit (Name (N));
3431 -- Make node global for error reporting
3433 Instantiation_Node := N;
3435 -- Turn off style checking in instances. If the check is enabled on the
3436 -- generic unit, a warning in an instance would just be noise. If not
3437 -- enabled on the generic, then a warning in an instance is just wrong.
3439 Style_Check := False;
3441 -- Case of instantiation of a generic package
3443 if Nkind (N) = N_Package_Instantiation then
3444 Act_Decl_Id := New_Copy (Defining_Entity (N));
3445 Set_Comes_From_Source (Act_Decl_Id, True);
3447 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3449 Make_Defining_Program_Unit_Name (Loc,
3450 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
3451 Defining_Identifier => Act_Decl_Id);
3453 Act_Decl_Name := Act_Decl_Id;
3456 -- Case of instantiation of a formal package
3459 Act_Decl_Id := Defining_Identifier (N);
3460 Act_Decl_Name := Act_Decl_Id;
3463 Generate_Definition (Act_Decl_Id);
3464 Preanalyze_Actuals (N);
3467 Env_Installed := True;
3469 -- Reset renaming map for formal types. The mapping is established
3470 -- when analyzing the generic associations, but some mappings are
3471 -- inherited from formal packages of parent units, and these are
3472 -- constructed when the parents are installed.
3474 Generic_Renamings.Set_Last (0);
3475 Generic_Renamings_HTable.Reset;
3477 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3478 Gen_Unit := Entity (Gen_Id);
3480 -- Verify that it is the name of a generic package
3482 -- A visibility glitch: if the instance is a child unit and the generic
3483 -- is the generic unit of a parent instance (i.e. both the parent and
3484 -- the child units are instances of the same package) the name now
3485 -- denotes the renaming within the parent, not the intended generic
3486 -- unit. See if there is a homonym that is the desired generic. The
3487 -- renaming declaration must be visible inside the instance of the
3488 -- child, but not when analyzing the name in the instantiation itself.
3490 if Ekind (Gen_Unit) = E_Package
3491 and then Present (Renamed_Entity (Gen_Unit))
3492 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3493 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3494 and then Present (Homonym (Gen_Unit))
3496 Gen_Unit := Homonym (Gen_Unit);
3499 if Etype (Gen_Unit) = Any_Type then
3503 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3505 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3507 if From_Limited_With (Gen_Unit) then
3509 ("cannot instantiate a limited withed package", Gen_Id);
3512 ("& is not the name of a generic package", Gen_Id, Gen_Unit);
3519 if In_Extended_Main_Source_Unit (N) then
3520 Set_Is_Instantiated (Gen_Unit);
3521 Generate_Reference (Gen_Unit, N);
3523 if Present (Renamed_Object (Gen_Unit)) then
3524 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3525 Generate_Reference (Renamed_Object (Gen_Unit), N);
3529 if Nkind (Gen_Id) = N_Identifier
3530 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3533 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3535 elsif Nkind (Gen_Id) = N_Expanded_Name
3536 and then Is_Child_Unit (Gen_Unit)
3537 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3538 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3541 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3544 Set_Entity (Gen_Id, Gen_Unit);
3546 -- If generic is a renaming, get original generic unit
3548 if Present (Renamed_Object (Gen_Unit))
3549 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3551 Gen_Unit := Renamed_Object (Gen_Unit);
3554 -- Verify that there are no circular instantiations
3556 if In_Open_Scopes (Gen_Unit) then
3557 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3561 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3562 Error_Msg_Node_2 := Current_Scope;
3564 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3565 Circularity_Detected := True;
3570 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3572 -- Initialize renamings map, for error checking, and the list that
3573 -- holds private entities whose views have changed between generic
3574 -- definition and instantiation. If this is the instance created to
3575 -- validate an actual package, the instantiation environment is that
3576 -- of the enclosing instance.
3578 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3580 -- Copy original generic tree, to produce text for instantiation
3584 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3586 Act_Spec := Specification (Act_Tree);
3588 -- If this is the instance created to validate an actual package,
3589 -- only the formals matter, do not examine the package spec itself.
3591 if Is_Actual_Pack then
3592 Set_Visible_Declarations (Act_Spec, New_List);
3593 Set_Private_Declarations (Act_Spec, New_List);
3597 Analyze_Associations
3599 Formals => Generic_Formal_Declarations (Act_Tree),
3600 F_Copy => Generic_Formal_Declarations (Gen_Decl));
3602 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
3604 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3605 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3606 Set_Is_Generic_Instance (Act_Decl_Id);
3607 Set_Generic_Parent (Act_Spec, Gen_Unit);
3609 -- References to the generic in its own declaration or its body are
3610 -- references to the instance. Add a renaming declaration for the
3611 -- generic unit itself. This declaration, as well as the renaming
3612 -- declarations for the generic formals, must remain private to the
3613 -- unit: the formals, because this is the language semantics, and
3614 -- the unit because its use is an artifact of the implementation.
3617 Make_Package_Renaming_Declaration (Loc,
3618 Defining_Unit_Name =>
3619 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3620 Name => New_Occurrence_Of (Act_Decl_Id, Loc));
3622 Append (Unit_Renaming, Renaming_List);
3624 -- The renaming declarations are the first local declarations of the
3627 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3629 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3631 Set_Visible_Declarations (Act_Spec, Renaming_List);
3635 Make_Package_Declaration (Loc,
3636 Specification => Act_Spec);
3638 -- Propagate the aspect specifications from the package declaration
3639 -- template to the instantiated version of the package declaration.
3641 if Has_Aspects (Act_Tree) then
3642 Set_Aspect_Specifications (Act_Decl,
3643 New_Copy_List_Tree (Aspect_Specifications (Act_Tree)));
3646 -- Save the instantiation node, for subsequent instantiation of the
3647 -- body, if there is one and we are generating code for the current
3648 -- unit. Mark unit as having a body (avoids premature error message).
3650 -- We instantiate the body if we are generating code, if we are
3651 -- generating cross-reference information, or if we are building
3652 -- trees for ASIS use or GNATprove use.
3655 Enclosing_Body_Present : Boolean := False;
3656 -- If the generic unit is not a compilation unit, then a body may
3657 -- be present in its parent even if none is required. We create a
3658 -- tentative pending instantiation for the body, which will be
3659 -- discarded if none is actually present.
3664 if Scope (Gen_Unit) /= Standard_Standard
3665 and then not Is_Child_Unit (Gen_Unit)
3667 Scop := Scope (Gen_Unit);
3669 while Present (Scop)
3670 and then Scop /= Standard_Standard
3672 if Unit_Requires_Body (Scop) then
3673 Enclosing_Body_Present := True;
3676 elsif In_Open_Scopes (Scop)
3677 and then In_Package_Body (Scop)
3679 Enclosing_Body_Present := True;
3683 exit when Is_Compilation_Unit (Scop);
3684 Scop := Scope (Scop);
3688 -- If front-end inlining is enabled, and this is a unit for which
3689 -- code will be generated, we instantiate the body at once.
3691 -- This is done if the instance is not the main unit, and if the
3692 -- generic is not a child unit of another generic, to avoid scope
3693 -- problems and the reinstallation of parent instances.
3696 and then (not Is_Child_Unit (Gen_Unit)
3697 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3698 and then Might_Inline_Subp
3699 and then not Is_Actual_Pack
3701 if not Debug_Flag_Dot_K
3702 and then Front_End_Inlining
3703 and then (Is_In_Main_Unit (N)
3704 or else In_Main_Context (Current_Scope))
3705 and then Nkind (Parent (N)) /= N_Compilation_Unit
3709 elsif Debug_Flag_Dot_K
3710 and then Must_Inline_Subp
3711 and then (Is_In_Main_Unit (N)
3712 or else In_Main_Context (Current_Scope))
3713 and then Nkind (Parent (N)) /= N_Compilation_Unit
3717 -- In configurable_run_time mode we force the inlining of
3718 -- predefined subprograms marked Inline_Always, to minimize
3719 -- the use of the run-time library.
3721 elsif Is_Predefined_File_Name
3722 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3723 and then Configurable_Run_Time_Mode
3724 and then Nkind (Parent (N)) /= N_Compilation_Unit
3729 -- If the current scope is itself an instance within a child
3730 -- unit, there will be duplications in the scope stack, and the
3731 -- unstacking mechanism in Inline_Instance_Body will fail.
3732 -- This loses some rare cases of optimization, and might be
3733 -- improved some day, if we can find a proper abstraction for
3734 -- "the complete compilation context" that can be saved and
3737 if Is_Generic_Instance (Current_Scope) then
3739 Curr_Unit : constant Entity_Id :=
3740 Cunit_Entity (Current_Sem_Unit);
3742 if Curr_Unit /= Current_Scope
3743 and then Is_Child_Unit (Curr_Unit)
3745 Inline_Now := False;
3752 (Unit_Requires_Body (Gen_Unit)
3753 or else Enclosing_Body_Present
3754 or else Present (Corresponding_Body (Gen_Decl)))
3755 and then (Is_In_Main_Unit (N) or else Might_Inline_Subp)
3756 and then not Is_Actual_Pack
3757 and then not Inline_Now
3758 and then (Operating_Mode = Generate_Code
3760 -- Need comment for this check ???
3762 or else (Operating_Mode = Check_Semantics
3763 and then (ASIS_Mode or GNATprove_Mode)));
3765 -- If front_end_inlining is enabled, do not instantiate body if
3766 -- within a generic context.
3768 if (Front_End_Inlining and then not Expander_Active)
3769 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3771 Needs_Body := False;
3774 -- If the current context is generic, and the package being
3775 -- instantiated is declared within a formal package, there is no
3776 -- body to instantiate until the enclosing generic is instantiated
3777 -- and there is an actual for the formal package. If the formal
3778 -- package has parameters, we build a regular package instance for
3779 -- it, that precedes the original formal package declaration.
3781 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3783 Decl : constant Node_Id :=
3785 (Unit_Declaration_Node (Scope (Gen_Unit)));
3787 if Nkind (Decl) = N_Formal_Package_Declaration
3788 or else (Nkind (Decl) = N_Package_Declaration
3789 and then Is_List_Member (Decl)
3790 and then Present (Next (Decl))
3792 Nkind (Next (Decl)) =
3793 N_Formal_Package_Declaration)
3795 Needs_Body := False;
3801 -- For RCI unit calling stubs, we omit the instance body if the
3802 -- instance is the RCI library unit itself.
3804 -- However there is a special case for nested instances: in this case
3805 -- we do generate the instance body, as it might be required, e.g.
3806 -- because it provides stream attributes for some type used in the
3807 -- profile of a remote subprogram. This is consistent with 12.3(12),
3808 -- which indicates that the instance body occurs at the place of the
3809 -- instantiation, and thus is part of the RCI declaration, which is
3810 -- present on all client partitions (this is E.2.3(18)).
3812 -- Note that AI12-0002 may make it illegal at some point to have
3813 -- stream attributes defined in an RCI unit, in which case this
3814 -- special case will become unnecessary. In the meantime, there
3815 -- is known application code in production that depends on this
3816 -- being possible, so we definitely cannot eliminate the body in
3817 -- the case of nested instances for the time being.
3819 -- When we generate a nested instance body, calling stubs for any
3820 -- relevant subprogram will be be inserted immediately after the
3821 -- subprogram declarations, and will take precedence over the
3822 -- subsequent (original) body. (The stub and original body will be
3823 -- complete homographs, but this is permitted in an instance).
3824 -- (Could we do better and remove the original body???)
3826 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3827 and then Comes_From_Source (N)
3828 and then Nkind (Parent (N)) = N_Compilation_Unit
3830 Needs_Body := False;
3835 -- Here is a defence against a ludicrous number of instantiations
3836 -- caused by a circular set of instantiation attempts.
3838 if Pending_Instantiations.Last > Maximum_Instantiations then
3839 Error_Msg_Uint_1 := UI_From_Int (Maximum_Instantiations);
3840 Error_Msg_N ("too many instantiations, exceeds max of^", N);
3841 Error_Msg_N ("\limit can be changed using -gnateinn switch", N);
3842 raise Unrecoverable_Error;
3845 -- Indicate that the enclosing scopes contain an instantiation,
3846 -- and that cleanup actions should be delayed until after the
3847 -- instance body is expanded.
3849 Check_Forward_Instantiation (Gen_Decl);
3850 if Nkind (N) = N_Package_Instantiation then
3852 Enclosing_Master : Entity_Id;
3855 -- Loop to search enclosing masters
3857 Enclosing_Master := Current_Scope;
3858 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3859 if Ekind (Enclosing_Master) = E_Package then
3860 if Is_Compilation_Unit (Enclosing_Master) then
3861 if In_Package_Body (Enclosing_Master) then
3863 (Body_Entity (Enclosing_Master));
3872 Enclosing_Master := Scope (Enclosing_Master);
3875 elsif Is_Generic_Unit (Enclosing_Master)
3876 or else Ekind (Enclosing_Master) = E_Void
3878 -- Cleanup actions will eventually be performed on the
3879 -- enclosing subprogram or package instance, if any.
3880 -- Enclosing scope is void in the formal part of a
3881 -- generic subprogram.
3886 if Ekind (Enclosing_Master) = E_Entry
3888 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3890 if not Expander_Active then
3894 Protected_Body_Subprogram (Enclosing_Master);
3898 Set_Delay_Cleanups (Enclosing_Master);
3900 while Ekind (Enclosing_Master) = E_Block loop
3901 Enclosing_Master := Scope (Enclosing_Master);
3904 if Is_Subprogram (Enclosing_Master) then
3905 Delay_Descriptors (Enclosing_Master);
3907 elsif Is_Task_Type (Enclosing_Master) then
3909 TBP : constant Node_Id :=
3910 Get_Task_Body_Procedure
3913 if Present (TBP) then
3914 Delay_Descriptors (TBP);
3915 Set_Delay_Cleanups (TBP);
3922 end loop Scope_Loop;
3925 -- Make entry in table
3927 Pending_Instantiations.Append
3929 Act_Decl => Act_Decl,
3930 Expander_Status => Expander_Active,
3931 Current_Sem_Unit => Current_Sem_Unit,
3932 Scope_Suppress => Scope_Suppress,
3933 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3934 Version => Ada_Version,
3935 Version_Pragma => Ada_Version_Pragma,
3936 Warnings => Save_Warnings,
3937 SPARK_Mode => SPARK_Mode,
3938 SPARK_Mode_Pragma => SPARK_Mode_Pragma));
3942 Set_Categorization_From_Pragmas (Act_Decl);
3944 if Parent_Installed then
3948 Set_Instance_Spec (N, Act_Decl);
3950 -- If not a compilation unit, insert the package declaration before
3951 -- the original instantiation node.
3953 if Nkind (Parent (N)) /= N_Compilation_Unit then
3954 Mark_Rewrite_Insertion (Act_Decl);
3955 Insert_Before (N, Act_Decl);
3958 -- For an instantiation that is a compilation unit, place
3959 -- declaration on current node so context is complete for analysis
3960 -- (including nested instantiations). If this is the main unit,
3961 -- the declaration eventually replaces the instantiation node.
3962 -- If the instance body is created later, it replaces the
3963 -- instance node, and the declaration is attached to it
3964 -- (see Build_Instance_Compilation_Unit_Nodes).
3967 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3969 -- The entity for the current unit is the newly created one,
3970 -- and all semantic information is attached to it.
3972 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3974 -- If this is the main unit, replace the main entity as well
3976 if Current_Sem_Unit = Main_Unit then
3977 Main_Unit_Entity := Act_Decl_Id;
3981 Set_Unit (Parent (N), Act_Decl);
3982 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3983 Set_Package_Instantiation (Act_Decl_Id, N);
3985 -- Process aspect specifications of the instance node, if any, to
3986 -- take into account categorization pragmas before analyzing the
3989 if Has_Aspects (N) then
3990 Analyze_Aspect_Specifications (N, Act_Decl_Id);
3994 Set_Unit (Parent (N), N);
3995 Set_Body_Required (Parent (N), False);
3997 -- We never need elaboration checks on instantiations, since by
3998 -- definition, the body instantiation is elaborated at the same
3999 -- time as the spec instantiation.
4001 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4002 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4005 Check_Elab_Instantiation (N);
4007 if ABE_Is_Certain (N) and then Needs_Body then
4008 Pending_Instantiations.Decrement_Last;
4011 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4013 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
4014 First_Private_Entity (Act_Decl_Id));
4016 -- If the instantiation will receive a body, the unit will be
4017 -- transformed into a package body, and receive its own elaboration
4018 -- entity. Otherwise, the nature of the unit is now a package
4021 if Nkind (Parent (N)) = N_Compilation_Unit
4022 and then not Needs_Body
4024 Rewrite (N, Act_Decl);
4027 if Present (Corresponding_Body (Gen_Decl))
4028 or else Unit_Requires_Body (Gen_Unit)
4030 Set_Has_Completion (Act_Decl_Id);
4033 Check_Formal_Packages (Act_Decl_Id);
4035 Restore_Hidden_Primitives (Vis_Prims_List);
4036 Restore_Private_Views (Act_Decl_Id);
4038 Inherit_Context (Gen_Decl, N);
4040 if Parent_Installed then
4045 Env_Installed := False;
4048 Validate_Categorization_Dependency (N, Act_Decl_Id);
4050 -- There used to be a check here to prevent instantiations in local
4051 -- contexts if the No_Local_Allocators restriction was active. This
4052 -- check was removed by a binding interpretation in AI-95-00130/07,
4053 -- but we retain the code for documentation purposes.
4055 -- if Ekind (Act_Decl_Id) /= E_Void
4056 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4058 -- Check_Restriction (No_Local_Allocators, N);
4062 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
4065 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4066 -- be used as defining identifiers for a formal package and for the
4067 -- corresponding expanded package.
4069 if Nkind (N) = N_Formal_Package_Declaration then
4070 Act_Decl_Id := New_Copy (Defining_Entity (N));
4071 Set_Comes_From_Source (Act_Decl_Id, True);
4072 Set_Is_Generic_Instance (Act_Decl_Id, False);
4073 Set_Defining_Identifier (N, Act_Decl_Id);
4076 Style_Check := Save_Style_Check;
4078 -- Check that if N is an instantiation of System.Dim_Float_IO or
4079 -- System.Dim_Integer_IO, the formal type has a dimension system.
4081 if Nkind (N) = N_Package_Instantiation
4082 and then Is_Dim_IO_Package_Instantiation (N)
4085 Assoc : constant Node_Id := First (Generic_Associations (N));
4087 if not Has_Dimension_System
4088 (Etype (Explicit_Generic_Actual_Parameter (Assoc)))
4090 Error_Msg_N ("type with a dimension system expected", Assoc);
4096 if Has_Aspects (N) and then Nkind (Parent (N)) /= N_Compilation_Unit then
4097 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4101 when Instantiation_Error =>
4102 if Parent_Installed then
4106 if Env_Installed then
4110 Style_Check := Save_Style_Check;
4111 end Analyze_Package_Instantiation;
4113 --------------------------
4114 -- Inline_Instance_Body --
4115 --------------------------
4117 procedure Inline_Instance_Body
4119 Gen_Unit : Entity_Id;
4123 Gen_Comp : constant Entity_Id :=
4124 Cunit_Entity (Get_Source_Unit (Gen_Unit));
4125 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
4126 Curr_Scope : Entity_Id := Empty;
4127 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
4128 Removed : Boolean := False;
4129 Num_Scopes : Int := 0;
4131 Scope_Stack_Depth : constant Int :=
4132 Scope_Stack.Last - Scope_Stack.First + 1;
4134 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
4135 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
4136 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
4138 Num_Inner : Int := 0;
4139 N_Instances : Int := 0;
4143 -- Case of generic unit defined in another unit. We must remove the
4144 -- complete context of the current unit to install that of the generic.
4146 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
4148 -- Add some comments for the following two loops ???
4151 while Present (S) and then S /= Standard_Standard loop
4153 Num_Scopes := Num_Scopes + 1;
4155 Use_Clauses (Num_Scopes) :=
4157 (Scope_Stack.Last - Num_Scopes + 1).
4159 End_Use_Clauses (Use_Clauses (Num_Scopes));
4161 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
4162 or else Scope_Stack.Table
4163 (Scope_Stack.Last - Num_Scopes).Entity
4167 exit when Is_Generic_Instance (S)
4168 and then (In_Package_Body (S)
4169 or else Ekind (S) = E_Procedure
4170 or else Ekind (S) = E_Function);
4174 Vis := Is_Immediately_Visible (Gen_Comp);
4176 -- Find and save all enclosing instances
4181 and then S /= Standard_Standard
4183 if Is_Generic_Instance (S) then
4184 N_Instances := N_Instances + 1;
4185 Instances (N_Instances) := S;
4187 exit when In_Package_Body (S);
4193 -- Remove context of current compilation unit, unless we are within a
4194 -- nested package instantiation, in which case the context has been
4195 -- removed previously.
4197 -- If current scope is the body of a child unit, remove context of
4198 -- spec as well. If an enclosing scope is an instance body, the
4199 -- context has already been removed, but the entities in the body
4200 -- must be made invisible as well.
4205 and then S /= Standard_Standard
4207 if Is_Generic_Instance (S)
4208 and then (In_Package_Body (S)
4209 or else Ekind (S) = E_Procedure
4210 or else Ekind (S) = E_Function)
4212 -- We still have to remove the entities of the enclosing
4213 -- instance from direct visibility.
4218 E := First_Entity (S);
4219 while Present (E) loop
4220 Set_Is_Immediately_Visible (E, False);
4229 or else (Ekind (Curr_Unit) = E_Package_Body
4230 and then S = Spec_Entity (Curr_Unit))
4231 or else (Ekind (Curr_Unit) = E_Subprogram_Body
4234 (Unit_Declaration_Node (Curr_Unit)))
4238 -- Remove entities in current scopes from visibility, so that
4239 -- instance body is compiled in a clean environment.
4241 List := Save_Scope_Stack (Handle_Use => False);
4243 if Is_Child_Unit (S) then
4245 -- Remove child unit from stack, as well as inner scopes.
4246 -- Removing the context of a child unit removes parent units
4249 while Current_Scope /= S loop
4250 Num_Inner := Num_Inner + 1;
4251 Inner_Scopes (Num_Inner) := Current_Scope;
4256 Remove_Context (Curr_Comp);
4260 Remove_Context (Curr_Comp);
4263 if Ekind (Curr_Unit) = E_Package_Body then
4264 Remove_Context (Library_Unit (Curr_Comp));
4270 pragma Assert (Num_Inner < Num_Scopes);
4272 Push_Scope (Standard_Standard);
4273 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
4274 Instantiate_Package_Body
4277 Act_Decl => Act_Decl,
4278 Expander_Status => Expander_Active,
4279 Current_Sem_Unit => Current_Sem_Unit,
4280 Scope_Suppress => Scope_Suppress,
4281 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4282 Version => Ada_Version,
4283 Version_Pragma => Ada_Version_Pragma,
4284 Warnings => Save_Warnings,
4285 SPARK_Mode => SPARK_Mode,
4286 SPARK_Mode_Pragma => SPARK_Mode_Pragma)),
4287 Inlined_Body => True);
4293 Set_Is_Immediately_Visible (Gen_Comp, Vis);
4295 -- Reset Generic_Instance flag so that use clauses can be installed
4296 -- in the proper order. (See Use_One_Package for effect of enclosing
4297 -- instances on processing of use clauses).
4299 for J in 1 .. N_Instances loop
4300 Set_Is_Generic_Instance (Instances (J), False);
4304 Install_Context (Curr_Comp);
4306 if Present (Curr_Scope)
4307 and then Is_Child_Unit (Curr_Scope)
4309 Push_Scope (Curr_Scope);
4310 Set_Is_Immediately_Visible (Curr_Scope);
4312 -- Finally, restore inner scopes as well
4314 for J in reverse 1 .. Num_Inner loop
4315 Push_Scope (Inner_Scopes (J));
4319 Restore_Scope_Stack (List, Handle_Use => False);
4321 if Present (Curr_Scope)
4323 (In_Private_Part (Curr_Scope)
4324 or else In_Package_Body (Curr_Scope))
4326 -- Install private declaration of ancestor units, which are
4327 -- currently available. Restore_Scope_Stack and Install_Context
4328 -- only install the visible part of parents.
4333 Par := Scope (Curr_Scope);
4334 while (Present (Par))
4335 and then Par /= Standard_Standard
4337 Install_Private_Declarations (Par);
4344 -- Restore use clauses. For a child unit, use clauses in the parents
4345 -- are restored when installing the context, so only those in inner
4346 -- scopes (and those local to the child unit itself) need to be
4347 -- installed explicitly.
4349 if Is_Child_Unit (Curr_Unit)
4352 for J in reverse 1 .. Num_Inner + 1 loop
4353 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4355 Install_Use_Clauses (Use_Clauses (J));
4359 for J in reverse 1 .. Num_Scopes loop
4360 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4362 Install_Use_Clauses (Use_Clauses (J));
4366 -- Restore status of instances. If one of them is a body, make its
4367 -- local entities visible again.
4374 for J in 1 .. N_Instances loop
4375 Inst := Instances (J);
4376 Set_Is_Generic_Instance (Inst, True);
4378 if In_Package_Body (Inst)
4379 or else Ekind (S) = E_Procedure
4380 or else Ekind (S) = E_Function
4382 E := First_Entity (Instances (J));
4383 while Present (E) loop
4384 Set_Is_Immediately_Visible (E);
4391 -- If generic unit is in current unit, current context is correct
4394 Instantiate_Package_Body
4397 Act_Decl => Act_Decl,
4398 Expander_Status => Expander_Active,
4399 Current_Sem_Unit => Current_Sem_Unit,
4400 Scope_Suppress => Scope_Suppress,
4401 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4402 Version => Ada_Version,
4403 Version_Pragma => Ada_Version_Pragma,
4404 Warnings => Save_Warnings,
4405 SPARK_Mode => SPARK_Mode,
4406 SPARK_Mode_Pragma => SPARK_Mode_Pragma)),
4407 Inlined_Body => True);
4409 end Inline_Instance_Body;
4411 -------------------------------------
4412 -- Analyze_Procedure_Instantiation --
4413 -------------------------------------
4415 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4417 Analyze_Subprogram_Instantiation (N, E_Procedure);
4418 end Analyze_Procedure_Instantiation;
4420 -----------------------------------
4421 -- Need_Subprogram_Instance_Body --
4422 -----------------------------------
4424 function Need_Subprogram_Instance_Body
4426 Subp : Entity_Id) return Boolean
4429 -- Must be inlined (or inlined renaming)
4431 if (Is_In_Main_Unit (N)
4432 or else Is_Inlined (Subp)
4433 or else Is_Inlined (Alias (Subp)))
4435 -- Must be generating code or analyzing code in ASIS/GNATprove mode
4437 and then (Operating_Mode = Generate_Code
4438 or else (Operating_Mode = Check_Semantics
4439 and then (ASIS_Mode or GNATprove_Mode)))
4441 -- The body is needed when generating code (full expansion), in ASIS
4442 -- mode for other tools, and in GNATprove mode (special expansion) for
4443 -- formal verification of the body itself.
4445 and then (Expander_Active or ASIS_Mode or GNATprove_Mode)
4447 -- No point in inlining if ABE is inevitable
4449 and then not ABE_Is_Certain (N)
4451 -- Or if subprogram is eliminated
4453 and then not Is_Eliminated (Subp)
4455 Pending_Instantiations.Append
4457 Act_Decl => Unit_Declaration_Node (Subp),
4458 Expander_Status => Expander_Active,
4459 Current_Sem_Unit => Current_Sem_Unit,
4460 Scope_Suppress => Scope_Suppress,
4461 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4462 Version => Ada_Version,
4463 Version_Pragma => Ada_Version_Pragma,
4464 Warnings => Save_Warnings,
4465 SPARK_Mode => SPARK_Mode,
4466 SPARK_Mode_Pragma => SPARK_Mode_Pragma));
4469 -- Here if not inlined, or we ignore the inlining
4474 end Need_Subprogram_Instance_Body;
4476 --------------------------------------
4477 -- Analyze_Subprogram_Instantiation --
4478 --------------------------------------
4480 procedure Analyze_Subprogram_Instantiation
4484 Loc : constant Source_Ptr := Sloc (N);
4485 Gen_Id : constant Node_Id := Name (N);
4487 Anon_Id : constant Entity_Id :=
4488 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4489 Chars => New_External_Name
4490 (Chars (Defining_Entity (N)), 'R'));
4492 Act_Decl_Id : Entity_Id;
4497 Env_Installed : Boolean := False;
4498 Gen_Unit : Entity_Id;
4500 Pack_Id : Entity_Id;
4501 Parent_Installed : Boolean := False;
4502 Renaming_List : List_Id;
4504 procedure Analyze_Instance_And_Renamings;
4505 -- The instance must be analyzed in a context that includes the mappings
4506 -- of generic parameters into actuals. We create a package declaration
4507 -- for this purpose, and a subprogram with an internal name within the
4508 -- package. The subprogram instance is simply an alias for the internal
4509 -- subprogram, declared in the current scope.
4511 ------------------------------------
4512 -- Analyze_Instance_And_Renamings --
4513 ------------------------------------
4515 procedure Analyze_Instance_And_Renamings is
4516 Def_Ent : constant Entity_Id := Defining_Entity (N);
4517 Pack_Decl : Node_Id;
4520 if Nkind (Parent (N)) = N_Compilation_Unit then
4522 -- For the case of a compilation unit, the container package has
4523 -- the same name as the instantiation, to insure that the binder
4524 -- calls the elaboration procedure with the right name. Copy the
4525 -- entity of the instance, which may have compilation level flags
4526 -- (e.g. Is_Child_Unit) set.
4528 Pack_Id := New_Copy (Def_Ent);
4531 -- Otherwise we use the name of the instantiation concatenated
4532 -- with its source position to ensure uniqueness if there are
4533 -- several instantiations with the same name.
4536 Make_Defining_Identifier (Loc,
4537 Chars => New_External_Name
4538 (Related_Id => Chars (Def_Ent),
4540 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4543 Pack_Decl := Make_Package_Declaration (Loc,
4544 Specification => Make_Package_Specification (Loc,
4545 Defining_Unit_Name => Pack_Id,
4546 Visible_Declarations => Renaming_List,
4547 End_Label => Empty));
4549 Set_Instance_Spec (N, Pack_Decl);
4550 Set_Is_Generic_Instance (Pack_Id);
4551 Set_Debug_Info_Needed (Pack_Id);
4553 -- Case of not a compilation unit
4555 if Nkind (Parent (N)) /= N_Compilation_Unit then
4556 Mark_Rewrite_Insertion (Pack_Decl);
4557 Insert_Before (N, Pack_Decl);
4558 Set_Has_Completion (Pack_Id);
4560 -- Case of an instantiation that is a compilation unit
4562 -- Place declaration on current node so context is complete for
4563 -- analysis (including nested instantiations), and for use in a
4564 -- context_clause (see Analyze_With_Clause).
4567 Set_Unit (Parent (N), Pack_Decl);
4568 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4571 Analyze (Pack_Decl);
4572 Check_Formal_Packages (Pack_Id);
4573 Set_Is_Generic_Instance (Pack_Id, False);
4575 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4578 -- Body of the enclosing package is supplied when instantiating the
4579 -- subprogram body, after semantic analysis is completed.
4581 if Nkind (Parent (N)) = N_Compilation_Unit then
4583 -- Remove package itself from visibility, so it does not
4584 -- conflict with subprogram.
4586 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4588 -- Set name and scope of internal subprogram so that the proper
4589 -- external name will be generated. The proper scope is the scope
4590 -- of the wrapper package. We need to generate debugging info for
4591 -- the internal subprogram, so set flag accordingly.
4593 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4594 Set_Scope (Anon_Id, Scope (Pack_Id));
4596 -- Mark wrapper package as referenced, to avoid spurious warnings
4597 -- if the instantiation appears in various with_ clauses of
4598 -- subunits of the main unit.
4600 Set_Referenced (Pack_Id);
4603 Set_Is_Generic_Instance (Anon_Id);
4604 Set_Debug_Info_Needed (Anon_Id);
4605 Act_Decl_Id := New_Copy (Anon_Id);
4607 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4608 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4609 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4610 Set_Comes_From_Source (Act_Decl_Id, True);
4612 -- The signature may involve types that are not frozen yet, but the
4613 -- subprogram will be frozen at the point the wrapper package is
4614 -- frozen, so it does not need its own freeze node. In fact, if one
4615 -- is created, it might conflict with the freezing actions from the
4618 Set_Has_Delayed_Freeze (Anon_Id, False);
4620 -- If the instance is a child unit, mark the Id accordingly. Mark
4621 -- the anonymous entity as well, which is the real subprogram and
4622 -- which is used when the instance appears in a context clause.
4623 -- Similarly, propagate the Is_Eliminated flag to handle properly
4624 -- nested eliminated subprograms.
4626 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4627 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4628 New_Overloaded_Entity (Act_Decl_Id);
4629 Check_Eliminated (Act_Decl_Id);
4630 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4632 -- In compilation unit case, kill elaboration checks on the
4633 -- instantiation, since they are never needed -- the body is
4634 -- instantiated at the same point as the spec.
4636 if Nkind (Parent (N)) = N_Compilation_Unit then
4637 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4638 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4639 Set_Is_Compilation_Unit (Anon_Id);
4641 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4644 -- The instance is not a freezing point for the new subprogram
4646 Set_Is_Frozen (Act_Decl_Id, False);
4648 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4649 Valid_Operator_Definition (Act_Decl_Id);
4652 Set_Alias (Act_Decl_Id, Anon_Id);
4653 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4654 Set_Has_Completion (Act_Decl_Id);
4655 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4657 if Nkind (Parent (N)) = N_Compilation_Unit then
4658 Set_Body_Required (Parent (N), False);
4660 end Analyze_Instance_And_Renamings;
4664 Vis_Prims_List : Elist_Id := No_Elist;
4665 -- List of primitives made temporarily visible in the instantiation
4666 -- to match the visibility of the formal type
4668 -- Start of processing for Analyze_Subprogram_Instantiation
4671 Check_SPARK_Restriction ("generic is not allowed", N);
4673 -- Very first thing: apply the special kludge for Text_IO processing
4674 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4675 -- Of course such an instantiation is bogus (these are packages, not
4676 -- subprograms), but we get a better error message if we do this.
4678 Check_Text_IO_Special_Unit (Gen_Id);
4680 -- Make node global for error reporting
4682 Instantiation_Node := N;
4684 -- For package instantiations we turn off style checks, because they
4685 -- will have been emitted in the generic. For subprogram instantiations
4686 -- we want to apply at least the check on overriding indicators so we
4687 -- do not modify the style check status.
4689 -- The renaming declarations for the actuals do not come from source and
4690 -- will not generate spurious warnings.
4692 Preanalyze_Actuals (N);
4695 Env_Installed := True;
4696 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4697 Gen_Unit := Entity (Gen_Id);
4699 Generate_Reference (Gen_Unit, Gen_Id);
4701 if Nkind (Gen_Id) = N_Identifier
4702 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4705 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4708 if Etype (Gen_Unit) = Any_Type then
4713 -- Verify that it is a generic subprogram of the right kind, and that
4714 -- it does not lead to a circular instantiation.
4716 if K = E_Procedure and then Ekind (Gen_Unit) /= E_Generic_Procedure then
4718 ("& is not the name of a generic procedure", Gen_Id, Gen_Unit);
4720 elsif K = E_Function and then Ekind (Gen_Unit) /= E_Generic_Function then
4722 ("& is not the name of a generic function", Gen_Id, Gen_Unit);
4724 elsif In_Open_Scopes (Gen_Unit) then
4725 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4728 Set_Entity (Gen_Id, Gen_Unit);
4729 Set_Is_Instantiated (Gen_Unit);
4731 if In_Extended_Main_Source_Unit (N) then
4732 Generate_Reference (Gen_Unit, N);
4735 -- If renaming, get original unit
4737 if Present (Renamed_Object (Gen_Unit))
4738 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4740 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4742 Gen_Unit := Renamed_Object (Gen_Unit);
4743 Set_Is_Instantiated (Gen_Unit);
4744 Generate_Reference (Gen_Unit, N);
4747 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4748 Error_Msg_Node_2 := Current_Scope;
4750 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4751 Circularity_Detected := True;
4752 Restore_Hidden_Primitives (Vis_Prims_List);
4756 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4758 -- Initialize renamings map, for error checking
4760 Generic_Renamings.Set_Last (0);
4761 Generic_Renamings_HTable.Reset;
4763 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4765 -- Copy original generic tree, to produce text for instantiation
4769 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4771 -- Inherit overriding indicator from instance node
4773 Act_Spec := Specification (Act_Tree);
4774 Set_Must_Override (Act_Spec, Must_Override (N));
4775 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4778 Analyze_Associations
4780 Formals => Generic_Formal_Declarations (Act_Tree),
4781 F_Copy => Generic_Formal_Declarations (Gen_Decl));
4783 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
4785 -- The subprogram itself cannot contain a nested instance, so the
4786 -- current parent is left empty.
4788 Set_Instance_Env (Gen_Unit, Empty);
4790 -- Build the subprogram declaration, which does not appear in the
4791 -- generic template, and give it a sloc consistent with that of the
4794 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4795 Set_Generic_Parent (Act_Spec, Gen_Unit);
4797 Make_Subprogram_Declaration (Sloc (Act_Spec),
4798 Specification => Act_Spec);
4800 -- The aspects have been copied previously, but they have to be
4801 -- linked explicitly to the new subprogram declaration. Explicit
4802 -- pre/postconditions on the instance are analyzed below, in a
4805 Move_Aspects (Act_Tree, To => Act_Decl);
4806 Set_Categorization_From_Pragmas (Act_Decl);
4808 if Parent_Installed then
4812 Append (Act_Decl, Renaming_List);
4813 Analyze_Instance_And_Renamings;
4815 -- If the generic is marked Import (Intrinsic), then so is the
4816 -- instance. This indicates that there is no body to instantiate. If
4817 -- generic is marked inline, so it the instance, and the anonymous
4818 -- subprogram it renames. If inlined, or else if inlining is enabled
4819 -- for the compilation, we generate the instance body even if it is
4820 -- not within the main unit.
4822 if Is_Intrinsic_Subprogram (Gen_Unit) then
4823 Set_Is_Intrinsic_Subprogram (Anon_Id);
4824 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4826 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4827 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4831 -- Inherit convention from generic unit. Intrinsic convention, as for
4832 -- an instance of unchecked conversion, is not inherited because an
4833 -- explicit Ada instance has been created.
4835 if Has_Convention_Pragma (Gen_Unit)
4836 and then Convention (Gen_Unit) /= Convention_Intrinsic
4838 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
4839 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
4842 Generate_Definition (Act_Decl_Id);
4843 -- Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id)));
4845 Set_Contract (Act_Decl_Id, Make_Contract (Sloc (Act_Decl_Id)));
4847 -- Inherit all inlining-related flags which apply to the generic in
4848 -- the subprogram and its declaration.
4850 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4851 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4853 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
4854 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
4856 Set_Has_Pragma_Inline_Always
4857 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
4858 Set_Has_Pragma_Inline_Always
4859 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
4861 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4862 Check_Elab_Instantiation (N);
4865 if Is_Dispatching_Operation (Act_Decl_Id)
4866 and then Ada_Version >= Ada_2005
4872 Formal := First_Formal (Act_Decl_Id);
4873 while Present (Formal) loop
4874 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4875 and then Is_Controlling_Formal (Formal)
4876 and then not Can_Never_Be_Null (Formal)
4878 Error_Msg_NE ("access parameter& is controlling,",
4881 ("\corresponding parameter of & must be"
4882 & " explicitly null-excluding", N, Gen_Id);
4885 Next_Formal (Formal);
4890 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4892 Validate_Categorization_Dependency (N, Act_Decl_Id);
4894 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4895 Inherit_Context (Gen_Decl, N);
4897 Restore_Private_Views (Pack_Id, False);
4899 -- If the context requires a full instantiation, mark node for
4900 -- subsequent construction of the body.
4902 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4903 Check_Forward_Instantiation (Gen_Decl);
4905 -- The wrapper package is always delayed, because it does not
4906 -- constitute a freeze point, but to insure that the freeze
4907 -- node is placed properly, it is created directly when
4908 -- instantiating the body (otherwise the freeze node might
4909 -- appear to early for nested instantiations).
4911 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4913 -- For ASIS purposes, indicate that the wrapper package has
4914 -- replaced the instantiation node.
4916 Rewrite (N, Unit (Parent (N)));
4917 Set_Unit (Parent (N), N);
4920 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4922 -- Replace instance node for library-level instantiations of
4923 -- intrinsic subprograms, for ASIS use.
4925 Rewrite (N, Unit (Parent (N)));
4926 Set_Unit (Parent (N), N);
4929 if Parent_Installed then
4933 Restore_Hidden_Primitives (Vis_Prims_List);
4935 Env_Installed := False;
4936 Generic_Renamings.Set_Last (0);
4937 Generic_Renamings_HTable.Reset;
4941 if Has_Aspects (N) then
4942 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4946 when Instantiation_Error =>
4947 if Parent_Installed then
4951 if Env_Installed then
4954 end Analyze_Subprogram_Instantiation;
4956 -------------------------
4957 -- Get_Associated_Node --
4958 -------------------------
4960 function Get_Associated_Node (N : Node_Id) return Node_Id is
4964 Assoc := Associated_Node (N);
4966 if Nkind (Assoc) /= Nkind (N) then
4969 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4973 -- If the node is part of an inner generic, it may itself have been
4974 -- remapped into a further generic copy. Associated_Node is otherwise
4975 -- used for the entity of the node, and will be of a different node
4976 -- kind, or else N has been rewritten as a literal or function call.
4978 while Present (Associated_Node (Assoc))
4979 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4981 Assoc := Associated_Node (Assoc);
4984 -- Follow and additional link in case the final node was rewritten.
4985 -- This can only happen with nested generic units.
4987 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4988 and then Present (Associated_Node (Assoc))
4989 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4990 N_Explicit_Dereference,
4995 Assoc := Associated_Node (Assoc);
4998 -- An additional special case: an unconstrained type in an object
4999 -- declaration may have been rewritten as a local subtype constrained
5000 -- by the expression in the declaration. We need to recover the
5001 -- original entity which may be global.
5003 if Present (Original_Node (Assoc))
5004 and then Nkind (Parent (N)) = N_Object_Declaration
5006 Assoc := Original_Node (Assoc);
5011 end Get_Associated_Node;
5013 -------------------------------------------
5014 -- Build_Instance_Compilation_Unit_Nodes --
5015 -------------------------------------------
5017 procedure Build_Instance_Compilation_Unit_Nodes
5022 Decl_Cunit : Node_Id;
5023 Body_Cunit : Node_Id;
5025 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
5026 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
5029 -- A new compilation unit node is built for the instance declaration
5032 Make_Compilation_Unit (Sloc (N),
5033 Context_Items => Empty_List,
5035 Aux_Decls_Node => Make_Compilation_Unit_Aux (Sloc (N)));
5037 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
5039 -- The new compilation unit is linked to its body, but both share the
5040 -- same file, so we do not set Body_Required on the new unit so as not
5041 -- to create a spurious dependency on a non-existent body in the ali.
5042 -- This simplifies CodePeer unit traversal.
5044 -- We use the original instantiation compilation unit as the resulting
5045 -- compilation unit of the instance, since this is the main unit.
5047 Rewrite (N, Act_Body);
5049 -- Propagate the aspect specifications from the package body template to
5050 -- the instantiated version of the package body.
5052 if Has_Aspects (Act_Body) then
5053 Set_Aspect_Specifications
5054 (N, New_Copy_List_Tree (Aspect_Specifications (Act_Body)));
5057 Body_Cunit := Parent (N);
5059 -- The two compilation unit nodes are linked by the Library_Unit field
5061 Set_Library_Unit (Decl_Cunit, Body_Cunit);
5062 Set_Library_Unit (Body_Cunit, Decl_Cunit);
5064 -- Preserve the private nature of the package if needed
5066 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
5068 -- If the instance is not the main unit, its context, categorization
5069 -- and elaboration entity are not relevant to the compilation.
5071 if Body_Cunit /= Cunit (Main_Unit) then
5072 Make_Instance_Unit (Body_Cunit, In_Main => False);
5076 -- The context clause items on the instantiation, which are now attached
5077 -- to the body compilation unit (since the body overwrote the original
5078 -- instantiation node), semantically belong on the spec, so copy them
5079 -- there. It's harmless to leave them on the body as well. In fact one
5080 -- could argue that they belong in both places.
5082 Citem := First (Context_Items (Body_Cunit));
5083 while Present (Citem) loop
5084 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
5088 -- Propagate categorization flags on packages, so that they appear in
5089 -- the ali file for the spec of the unit.
5091 if Ekind (New_Main) = E_Package then
5092 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
5093 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
5094 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
5095 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
5096 Set_Is_Remote_Call_Interface
5097 (Old_Main, Is_Remote_Call_Interface (New_Main));
5100 -- Make entry in Units table, so that binder can generate call to
5101 -- elaboration procedure for body, if any.
5103 Make_Instance_Unit (Body_Cunit, In_Main => True);
5104 Main_Unit_Entity := New_Main;
5105 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
5107 -- Build elaboration entity, since the instance may certainly generate
5108 -- elaboration code requiring a flag for protection.
5110 Build_Elaboration_Entity (Decl_Cunit, New_Main);
5111 end Build_Instance_Compilation_Unit_Nodes;
5113 -----------------------------
5114 -- Check_Access_Definition --
5115 -----------------------------
5117 procedure Check_Access_Definition (N : Node_Id) is
5120 (Ada_Version >= Ada_2005 and then Present (Access_Definition (N)));
5122 end Check_Access_Definition;
5124 -----------------------------------
5125 -- Check_Formal_Package_Instance --
5126 -----------------------------------
5128 -- If the formal has specific parameters, they must match those of the
5129 -- actual. Both of them are instances, and the renaming declarations for
5130 -- their formal parameters appear in the same order in both. The analyzed
5131 -- formal has been analyzed in the context of the current instance.
5133 procedure Check_Formal_Package_Instance
5134 (Formal_Pack : Entity_Id;
5135 Actual_Pack : Entity_Id)
5137 E1 : Entity_Id := First_Entity (Actual_Pack);
5138 E2 : Entity_Id := First_Entity (Formal_Pack);
5143 procedure Check_Mismatch (B : Boolean);
5144 -- Common error routine for mismatch between the parameters of the
5145 -- actual instance and those of the formal package.
5147 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
5148 -- The formal may come from a nested formal package, and the actual may
5149 -- have been constant-folded. To determine whether the two denote the
5150 -- same entity we may have to traverse several definitions to recover
5151 -- the ultimate entity that they refer to.
5153 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
5154 -- Similarly, if the formal comes from a nested formal package, the
5155 -- actual may designate the formal through multiple renamings, which
5156 -- have to be followed to determine the original variable in question.
5158 --------------------
5159 -- Check_Mismatch --
5160 --------------------
5162 procedure Check_Mismatch (B : Boolean) is
5163 Kind : constant Node_Kind := Nkind (Parent (E2));
5166 if Kind = N_Formal_Type_Declaration then
5169 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
5170 N_Formal_Package_Declaration)
5171 or else Kind in N_Formal_Subprogram_Declaration
5177 ("actual for & in actual instance does not match formal",
5178 Parent (Actual_Pack), E1);
5182 --------------------------------
5183 -- Same_Instantiated_Constant --
5184 --------------------------------
5186 function Same_Instantiated_Constant
5187 (E1, E2 : Entity_Id) return Boolean
5193 while Present (Ent) loop
5197 elsif Ekind (Ent) /= E_Constant then
5200 elsif Is_Entity_Name (Constant_Value (Ent)) then
5201 if Entity (Constant_Value (Ent)) = E1 then
5204 Ent := Entity (Constant_Value (Ent));
5207 -- The actual may be a constant that has been folded. Recover
5210 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
5211 Ent := Entity (Original_Node (Constant_Value (Ent)));
5218 end Same_Instantiated_Constant;
5220 --------------------------------
5221 -- Same_Instantiated_Variable --
5222 --------------------------------
5224 function Same_Instantiated_Variable
5225 (E1, E2 : Entity_Id) return Boolean
5227 function Original_Entity (E : Entity_Id) return Entity_Id;
5228 -- Follow chain of renamings to the ultimate ancestor
5230 ---------------------
5231 -- Original_Entity --
5232 ---------------------
5234 function Original_Entity (E : Entity_Id) return Entity_Id is
5239 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
5240 and then Present (Renamed_Object (Orig))
5241 and then Is_Entity_Name (Renamed_Object (Orig))
5243 Orig := Entity (Renamed_Object (Orig));
5247 end Original_Entity;
5249 -- Start of processing for Same_Instantiated_Variable
5252 return Ekind (E1) = Ekind (E2)
5253 and then Original_Entity (E1) = Original_Entity (E2);
5254 end Same_Instantiated_Variable;
5256 -- Start of processing for Check_Formal_Package_Instance
5260 and then Present (E2)
5262 exit when Ekind (E1) = E_Package
5263 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
5265 -- If the formal is the renaming of the formal package, this
5266 -- is the end of its formal part, which may occur before the
5267 -- end of the formal part in the actual in the presence of
5268 -- defaulted parameters in the formal package.
5270 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
5271 and then Renamed_Entity (E2) = Scope (E2);
5273 -- The analysis of the actual may generate additional internal
5274 -- entities. If the formal is defaulted, there is no corresponding
5275 -- analysis and the internal entities must be skipped, until we
5276 -- find corresponding entities again.
5278 if Comes_From_Source (E2)
5279 and then not Comes_From_Source (E1)
5280 and then Chars (E1) /= Chars (E2)
5283 and then Chars (E1) /= Chars (E2)
5292 -- If the formal entity comes from a formal declaration, it was
5293 -- defaulted in the formal package, and no check is needed on it.
5295 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
5298 -- Ditto for defaulted formal subprograms.
5300 elsif Is_Overloadable (E1)
5301 and then Nkind (Unit_Declaration_Node (E2)) in
5302 N_Formal_Subprogram_Declaration
5306 elsif Is_Type (E1) then
5308 -- Subtypes must statically match. E1, E2 are the local entities
5309 -- that are subtypes of the actuals. Itypes generated for other
5310 -- parameters need not be checked, the check will be performed
5311 -- on the parameters themselves.
5313 -- If E2 is a formal type declaration, it is a defaulted parameter
5314 -- and needs no checking.
5316 if not Is_Itype (E1)
5317 and then not Is_Itype (E2)
5321 or else Etype (E1) /= Etype (E2)
5322 or else not Subtypes_Statically_Match (E1, E2));
5325 elsif Ekind (E1) = E_Constant then
5327 -- IN parameters must denote the same static value, or the same
5328 -- constant, or the literal null.
5330 Expr1 := Expression (Parent (E1));
5332 if Ekind (E2) /= E_Constant then
5333 Check_Mismatch (True);
5336 Expr2 := Expression (Parent (E2));
5339 if Is_Static_Expression (Expr1) then
5341 if not Is_Static_Expression (Expr2) then
5342 Check_Mismatch (True);
5344 elsif Is_Discrete_Type (Etype (E1)) then
5346 V1 : constant Uint := Expr_Value (Expr1);
5347 V2 : constant Uint := Expr_Value (Expr2);
5349 Check_Mismatch (V1 /= V2);
5352 elsif Is_Real_Type (Etype (E1)) then
5354 V1 : constant Ureal := Expr_Value_R (Expr1);
5355 V2 : constant Ureal := Expr_Value_R (Expr2);
5357 Check_Mismatch (V1 /= V2);
5360 elsif Is_String_Type (Etype (E1))
5361 and then Nkind (Expr1) = N_String_Literal
5363 if Nkind (Expr2) /= N_String_Literal then
5364 Check_Mismatch (True);
5367 (not String_Equal (Strval (Expr1), Strval (Expr2)));
5371 elsif Is_Entity_Name (Expr1) then
5372 if Is_Entity_Name (Expr2) then
5373 if Entity (Expr1) = Entity (Expr2) then
5377 (not Same_Instantiated_Constant
5378 (Entity (Expr1), Entity (Expr2)));
5381 Check_Mismatch (True);
5384 elsif Is_Entity_Name (Original_Node (Expr1))
5385 and then Is_Entity_Name (Expr2)
5387 Same_Instantiated_Constant
5388 (Entity (Original_Node (Expr1)), Entity (Expr2))
5392 elsif Nkind (Expr1) = N_Null then
5393 Check_Mismatch (Nkind (Expr1) /= N_Null);
5396 Check_Mismatch (True);
5399 elsif Ekind (E1) = E_Variable then
5400 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
5402 elsif Ekind (E1) = E_Package then
5404 (Ekind (E1) /= Ekind (E2)
5405 or else Renamed_Object (E1) /= Renamed_Object (E2));
5407 elsif Is_Overloadable (E1) then
5409 -- Verify that the actual subprograms match. Note that actuals
5410 -- that are attributes are rewritten as subprograms. If the
5411 -- subprogram in the formal package is defaulted, no check is
5412 -- needed. Note that this can only happen in Ada 2005 when the
5413 -- formal package can be partially parameterized.
5415 if Nkind (Unit_Declaration_Node (E1)) =
5416 N_Subprogram_Renaming_Declaration
5417 and then From_Default (Unit_Declaration_Node (E1))
5421 -- If the formal package has an "others" box association that
5422 -- covers this formal, there is no need for a check either.
5424 elsif Nkind (Unit_Declaration_Node (E2)) in
5425 N_Formal_Subprogram_Declaration
5426 and then Box_Present (Unit_Declaration_Node (E2))
5430 -- No check needed if subprogram is a defaulted null procedure
5432 elsif No (Alias (E2))
5433 and then Ekind (E2) = E_Procedure
5435 Null_Present (Specification (Unit_Declaration_Node (E2)))
5439 -- Otherwise the actual in the formal and the actual in the
5440 -- instantiation of the formal must match, up to renamings.
5444 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5448 raise Program_Error;
5455 end Check_Formal_Package_Instance;
5457 ---------------------------
5458 -- Check_Formal_Packages --
5459 ---------------------------
5461 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5463 Formal_P : Entity_Id;
5466 -- Iterate through the declarations in the instance, looking for package
5467 -- renaming declarations that denote instances of formal packages. Stop
5468 -- when we find the renaming of the current package itself. The
5469 -- declaration for a formal package without a box is followed by an
5470 -- internal entity that repeats the instantiation.
5472 E := First_Entity (P_Id);
5473 while Present (E) loop
5474 if Ekind (E) = E_Package then
5475 if Renamed_Object (E) = P_Id then
5478 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5481 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5482 Formal_P := Next_Entity (E);
5483 Check_Formal_Package_Instance (Formal_P, E);
5485 -- After checking, remove the internal validating package. It
5486 -- is only needed for semantic checks, and as it may contain
5487 -- generic formal declarations it should not reach gigi.
5489 Remove (Unit_Declaration_Node (Formal_P));
5495 end Check_Formal_Packages;
5497 ---------------------------------
5498 -- Check_Forward_Instantiation --
5499 ---------------------------------
5501 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5503 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5506 -- The instantiation appears before the generic body if we are in the
5507 -- scope of the unit containing the generic, either in its spec or in
5508 -- the package body, and before the generic body.
5510 if Ekind (Gen_Comp) = E_Package_Body then
5511 Gen_Comp := Spec_Entity (Gen_Comp);
5514 if In_Open_Scopes (Gen_Comp)
5515 and then No (Corresponding_Body (Decl))
5520 and then not Is_Compilation_Unit (S)
5521 and then not Is_Child_Unit (S)
5523 if Ekind (S) = E_Package then
5524 Set_Has_Forward_Instantiation (S);
5530 end Check_Forward_Instantiation;
5532 ---------------------------
5533 -- Check_Generic_Actuals --
5534 ---------------------------
5536 -- The visibility of the actuals may be different between the point of
5537 -- generic instantiation and the instantiation of the body.
5539 procedure Check_Generic_Actuals
5540 (Instance : Entity_Id;
5541 Is_Formal_Box : Boolean)
5546 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5547 -- For a formal that is an array type, the component type is often a
5548 -- previous formal in the same unit. The privacy status of the component
5549 -- type will have been examined earlier in the traversal of the
5550 -- corresponding actuals, and this status should not be modified for
5551 -- the array (sub)type itself. However, if the base type of the array
5552 -- (sub)type is private, its full view must be restored in the body to
5553 -- be consistent with subsequent index subtypes, etc.
5555 -- To detect this case we have to rescan the list of formals, which is
5556 -- usually short enough to ignore the resulting inefficiency.
5558 -----------------------------
5559 -- Denotes_Previous_Actual --
5560 -----------------------------
5562 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5566 Prev := First_Entity (Instance);
5567 while Present (Prev) loop
5569 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5570 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5571 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5584 end Denotes_Previous_Actual;
5586 -- Start of processing for Check_Generic_Actuals
5589 E := First_Entity (Instance);
5590 while Present (E) loop
5592 and then Nkind (Parent (E)) = N_Subtype_Declaration
5593 and then Scope (Etype (E)) /= Instance
5594 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5596 if Is_Array_Type (E)
5597 and then not Is_Private_Type (Etype (E))
5598 and then Denotes_Previous_Actual (Component_Type (E))
5602 Check_Private_View (Subtype_Indication (Parent (E)));
5605 Set_Is_Generic_Actual_Type (E, True);
5606 Set_Is_Hidden (E, False);
5607 Set_Is_Potentially_Use_Visible (E,
5610 -- We constructed the generic actual type as a subtype of the
5611 -- supplied type. This means that it normally would not inherit
5612 -- subtype specific attributes of the actual, which is wrong for
5613 -- the generic case.
5615 Astype := Ancestor_Subtype (E);
5619 -- This can happen when E is an itype that is the full view of
5620 -- a private type completed, e.g. with a constrained array. In
5621 -- that case, use the first subtype, which will carry size
5622 -- information. The base type itself is unconstrained and will
5625 Astype := First_Subtype (E);
5628 Set_Size_Info (E, (Astype));
5629 Set_RM_Size (E, RM_Size (Astype));
5630 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5632 if Is_Discrete_Or_Fixed_Point_Type (E) then
5633 Set_RM_Size (E, RM_Size (Astype));
5635 -- In nested instances, the base type of an access actual may
5636 -- itself be private, and need to be exchanged.
5638 elsif Is_Access_Type (E)
5639 and then Is_Private_Type (Etype (E))
5642 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5645 elsif Ekind (E) = E_Package then
5647 -- If this is the renaming for the current instance, we're done.
5648 -- Otherwise it is a formal package. If the corresponding formal
5649 -- was declared with a box, the (instantiations of the) generic
5650 -- formal part are also visible. Otherwise, ignore the entity
5651 -- created to validate the actuals.
5653 if Renamed_Object (E) = Instance then
5656 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5659 -- The visibility of a formal of an enclosing generic is already
5662 elsif Denotes_Formal_Package (E) then
5665 elsif Present (Associated_Formal_Package (E))
5666 and then not Is_Generic_Formal (E)
5668 if Box_Present (Parent (Associated_Formal_Package (E))) then
5669 Check_Generic_Actuals (Renamed_Object (E), True);
5672 Check_Generic_Actuals (Renamed_Object (E), False);
5675 Set_Is_Hidden (E, False);
5678 -- If this is a subprogram instance (in a wrapper package) the
5679 -- actual is fully visible.
5681 elsif Is_Wrapper_Package (Instance) then
5682 Set_Is_Hidden (E, False);
5684 -- If the formal package is declared with a box, or if the formal
5685 -- parameter is defaulted, it is visible in the body.
5688 or else Is_Visible_Formal (E)
5690 Set_Is_Hidden (E, False);
5693 if Ekind (E) = E_Constant then
5695 -- If the type of the actual is a private type declared in the
5696 -- enclosing scope of the generic unit, the body of the generic
5697 -- sees the full view of the type (because it has to appear in
5698 -- the corresponding package body). If the type is private now,
5699 -- exchange views to restore the proper visiblity in the instance.
5702 Typ : constant Entity_Id := Base_Type (Etype (E));
5703 -- The type of the actual
5708 Parent_Scope : Entity_Id;
5709 -- The enclosing scope of the generic unit
5712 if Is_Wrapper_Package (Instance) then
5716 (Unit_Declaration_Node
5717 (Related_Instance (Instance))));
5720 Generic_Parent (Package_Specification (Instance));
5723 Parent_Scope := Scope (Gen_Id);
5725 -- The exchange is only needed if the generic is defined
5726 -- within a package which is not a common ancestor of the
5727 -- scope of the instance, and is not already in scope.
5729 if Is_Private_Type (Typ)
5730 and then Scope (Typ) = Parent_Scope
5731 and then Scope (Instance) /= Parent_Scope
5732 and then Ekind (Parent_Scope) = E_Package
5733 and then not Is_Child_Unit (Gen_Id)
5737 -- If the type of the entity is a subtype, it may also have
5738 -- to be made visible, together with the base type of its
5739 -- full view, after exchange.
5741 if Is_Private_Type (Etype (E)) then
5742 Switch_View (Etype (E));
5743 Switch_View (Base_Type (Etype (E)));
5751 end Check_Generic_Actuals;
5753 ------------------------------
5754 -- Check_Generic_Child_Unit --
5755 ------------------------------
5757 procedure Check_Generic_Child_Unit
5759 Parent_Installed : in out Boolean)
5761 Loc : constant Source_Ptr := Sloc (Gen_Id);
5762 Gen_Par : Entity_Id := Empty;
5764 Inst_Par : Entity_Id;
5767 function Find_Generic_Child
5769 Id : Node_Id) return Entity_Id;
5770 -- Search generic parent for possible child unit with the given name
5772 function In_Enclosing_Instance return Boolean;
5773 -- Within an instance of the parent, the child unit may be denoted by
5774 -- a simple name, or an abbreviated expanded name. Examine enclosing
5775 -- scopes to locate a possible parent instantiation.
5777 ------------------------
5778 -- Find_Generic_Child --
5779 ------------------------
5781 function Find_Generic_Child
5783 Id : Node_Id) return Entity_Id
5788 -- If entity of name is already set, instance has already been
5789 -- resolved, e.g. in an enclosing instantiation.
5791 if Present (Entity (Id)) then
5792 if Scope (Entity (Id)) = Scop then
5799 E := First_Entity (Scop);
5800 while Present (E) loop
5801 if Chars (E) = Chars (Id)
5802 and then Is_Child_Unit (E)
5804 if Is_Child_Unit (E)
5805 and then not Is_Visible_Lib_Unit (E)
5808 ("generic child unit& is not visible", Gen_Id, E);
5820 end Find_Generic_Child;
5822 ---------------------------
5823 -- In_Enclosing_Instance --
5824 ---------------------------
5826 function In_Enclosing_Instance return Boolean is
5827 Enclosing_Instance : Node_Id;
5828 Instance_Decl : Node_Id;
5831 -- We do not inline any call that contains instantiations, except
5832 -- for instantiations of Unchecked_Conversion, so if we are within
5833 -- an inlined body the current instance does not require parents.
5835 if In_Inlined_Body then
5836 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5840 -- Loop to check enclosing scopes
5842 Enclosing_Instance := Current_Scope;
5843 while Present (Enclosing_Instance) loop
5844 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5846 if Ekind (Enclosing_Instance) = E_Package
5847 and then Is_Generic_Instance (Enclosing_Instance)
5849 (Generic_Parent (Specification (Instance_Decl)))
5851 -- Check whether the generic we are looking for is a child of
5854 E := Find_Generic_Child
5855 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5856 exit when Present (E);
5862 Enclosing_Instance := Scope (Enclosing_Instance);
5874 Make_Expanded_Name (Loc,
5876 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5877 Selector_Name => New_Occurrence_Of (E, Loc)));
5879 Set_Entity (Gen_Id, E);
5880 Set_Etype (Gen_Id, Etype (E));
5881 Parent_Installed := False; -- Already in scope.
5884 end In_Enclosing_Instance;
5886 -- Start of processing for Check_Generic_Child_Unit
5889 -- If the name of the generic is given by a selected component, it may
5890 -- be the name of a generic child unit, and the prefix is the name of an
5891 -- instance of the parent, in which case the child unit must be visible.
5892 -- If this instance is not in scope, it must be placed there and removed
5893 -- after instantiation, because what is being instantiated is not the
5894 -- original child, but the corresponding child present in the instance
5897 -- If the child is instantiated within the parent, it can be given by
5898 -- a simple name. In this case the instance is already in scope, but
5899 -- the child generic must be recovered from the generic parent as well.
5901 if Nkind (Gen_Id) = N_Selected_Component then
5902 S := Selector_Name (Gen_Id);
5903 Analyze (Prefix (Gen_Id));
5904 Inst_Par := Entity (Prefix (Gen_Id));
5906 if Ekind (Inst_Par) = E_Package
5907 and then Present (Renamed_Object (Inst_Par))
5909 Inst_Par := Renamed_Object (Inst_Par);
5912 if Ekind (Inst_Par) = E_Package then
5913 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5914 Gen_Par := Generic_Parent (Parent (Inst_Par));
5916 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5918 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5920 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5923 elsif Ekind (Inst_Par) = E_Generic_Package
5924 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5926 -- A formal package may be a real child package, and not the
5927 -- implicit instance within a parent. In this case the child is
5928 -- not visible and has to be retrieved explicitly as well.
5930 Gen_Par := Inst_Par;
5933 if Present (Gen_Par) then
5935 -- The prefix denotes an instantiation. The entity itself may be a
5936 -- nested generic, or a child unit.
5938 E := Find_Generic_Child (Gen_Par, S);
5941 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5942 Set_Entity (Gen_Id, E);
5943 Set_Etype (Gen_Id, Etype (E));
5945 Set_Etype (S, Etype (E));
5947 -- Indicate that this is a reference to the parent
5949 if In_Extended_Main_Source_Unit (Gen_Id) then
5950 Set_Is_Instantiated (Inst_Par);
5953 -- A common mistake is to replicate the naming scheme of a
5954 -- hierarchy by instantiating a generic child directly, rather
5955 -- than the implicit child in a parent instance:
5957 -- generic .. package Gpar is ..
5958 -- generic .. package Gpar.Child is ..
5959 -- package Par is new Gpar ();
5962 -- package Par.Child is new Gpar.Child ();
5963 -- rather than Par.Child
5965 -- In this case the instantiation is within Par, which is an
5966 -- instance, but Gpar does not denote Par because we are not IN
5967 -- the instance of Gpar, so this is illegal. The test below
5968 -- recognizes this particular case.
5970 if Is_Child_Unit (E)
5971 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5972 and then (not In_Instance
5973 or else Nkind (Parent (Parent (Gen_Id))) =
5977 ("prefix of generic child unit must be instance of parent",
5981 if not In_Open_Scopes (Inst_Par)
5982 and then Nkind (Parent (Gen_Id)) not in
5983 N_Generic_Renaming_Declaration
5985 Install_Parent (Inst_Par);
5986 Parent_Installed := True;
5988 elsif In_Open_Scopes (Inst_Par) then
5990 -- If the parent is already installed, install the actuals
5991 -- for its formal packages. This is necessary when the child
5992 -- instance is a child of the parent instance: in this case,
5993 -- the parent is placed on the scope stack but the formal
5994 -- packages are not made visible.
5996 Install_Formal_Packages (Inst_Par);
6000 -- If the generic parent does not contain an entity that
6001 -- corresponds to the selector, the instance doesn't either.
6002 -- Analyzing the node will yield the appropriate error message.
6003 -- If the entity is not a child unit, then it is an inner
6004 -- generic in the parent.
6012 if Is_Child_Unit (Entity (Gen_Id))
6014 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
6015 and then not In_Open_Scopes (Inst_Par)
6017 Install_Parent (Inst_Par);
6018 Parent_Installed := True;
6020 -- The generic unit may be the renaming of the implicit child
6021 -- present in an instance. In that case the parent instance is
6022 -- obtained from the name of the renamed entity.
6024 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
6025 and then Present (Renamed_Entity (Entity (Gen_Id)))
6026 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
6029 Renamed_Package : constant Node_Id :=
6030 Name (Parent (Entity (Gen_Id)));
6032 if Nkind (Renamed_Package) = N_Expanded_Name then
6033 Inst_Par := Entity (Prefix (Renamed_Package));
6034 Install_Parent (Inst_Par);
6035 Parent_Installed := True;
6041 elsif Nkind (Gen_Id) = N_Expanded_Name then
6043 -- Entity already present, analyze prefix, whose meaning may be
6044 -- an instance in the current context. If it is an instance of
6045 -- a relative within another, the proper parent may still have
6046 -- to be installed, if they are not of the same generation.
6048 Analyze (Prefix (Gen_Id));
6050 -- In the unlikely case that a local declaration hides the name
6051 -- of the parent package, locate it on the homonym chain. If the
6052 -- context is an instance of the parent, the renaming entity is
6055 Inst_Par := Entity (Prefix (Gen_Id));
6056 while Present (Inst_Par)
6057 and then not Is_Package_Or_Generic_Package (Inst_Par)
6059 Inst_Par := Homonym (Inst_Par);
6062 pragma Assert (Present (Inst_Par));
6063 Set_Entity (Prefix (Gen_Id), Inst_Par);
6065 if In_Enclosing_Instance then
6068 elsif Present (Entity (Gen_Id))
6069 and then Is_Child_Unit (Entity (Gen_Id))
6070 and then not In_Open_Scopes (Inst_Par)
6072 Install_Parent (Inst_Par);
6073 Parent_Installed := True;
6076 elsif In_Enclosing_Instance then
6078 -- The child unit is found in some enclosing scope
6085 -- If this is the renaming of the implicit child in a parent
6086 -- instance, recover the parent name and install it.
6088 if Is_Entity_Name (Gen_Id) then
6089 E := Entity (Gen_Id);
6091 if Is_Generic_Unit (E)
6092 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
6093 and then Is_Child_Unit (Renamed_Object (E))
6094 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
6095 and then Nkind (Name (Parent (E))) = N_Expanded_Name
6098 New_Copy_Tree (Name (Parent (E))));
6099 Inst_Par := Entity (Prefix (Gen_Id));
6101 if not In_Open_Scopes (Inst_Par) then
6102 Install_Parent (Inst_Par);
6103 Parent_Installed := True;
6106 -- If it is a child unit of a non-generic parent, it may be
6107 -- use-visible and given by a direct name. Install parent as
6110 elsif Is_Generic_Unit (E)
6111 and then Is_Child_Unit (E)
6113 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
6114 and then not Is_Generic_Unit (Scope (E))
6116 if not In_Open_Scopes (Scope (E)) then
6117 Install_Parent (Scope (E));
6118 Parent_Installed := True;
6123 end Check_Generic_Child_Unit;
6125 -----------------------------
6126 -- Check_Hidden_Child_Unit --
6127 -----------------------------
6129 procedure Check_Hidden_Child_Unit
6131 Gen_Unit : Entity_Id;
6132 Act_Decl_Id : Entity_Id)
6134 Gen_Id : constant Node_Id := Name (N);
6137 if Is_Child_Unit (Gen_Unit)
6138 and then Is_Child_Unit (Act_Decl_Id)
6139 and then Nkind (Gen_Id) = N_Expanded_Name
6140 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
6141 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
6143 Error_Msg_Node_2 := Scope (Act_Decl_Id);
6145 ("generic unit & is implicitly declared in &",
6146 Defining_Unit_Name (N), Gen_Unit);
6147 Error_Msg_N ("\instance must have different name",
6148 Defining_Unit_Name (N));
6150 end Check_Hidden_Child_Unit;
6152 ------------------------
6153 -- Check_Private_View --
6154 ------------------------
6156 procedure Check_Private_View (N : Node_Id) is
6157 T : constant Entity_Id := Etype (N);
6161 -- Exchange views if the type was not private in the generic but is
6162 -- private at the point of instantiation. Do not exchange views if
6163 -- the scope of the type is in scope. This can happen if both generic
6164 -- and instance are sibling units, or if type is defined in a parent.
6165 -- In this case the visibility of the type will be correct for all
6169 BT := Base_Type (T);
6171 if Is_Private_Type (T)
6172 and then not Has_Private_View (N)
6173 and then Present (Full_View (T))
6174 and then not In_Open_Scopes (Scope (T))
6176 -- In the generic, the full type was visible. Save the private
6177 -- entity, for subsequent exchange.
6181 elsif Has_Private_View (N)
6182 and then not Is_Private_Type (T)
6183 and then not Has_Been_Exchanged (T)
6184 and then Etype (Get_Associated_Node (N)) /= T
6186 -- Only the private declaration was visible in the generic. If
6187 -- the type appears in a subtype declaration, the subtype in the
6188 -- instance must have a view compatible with that of its parent,
6189 -- which must be exchanged (see corresponding code in Restore_
6190 -- Private_Views). Otherwise, if the type is defined in a parent
6191 -- unit, leave full visibility within instance, which is safe.
6193 if In_Open_Scopes (Scope (Base_Type (T)))
6194 and then not Is_Private_Type (Base_Type (T))
6195 and then Comes_From_Source (Base_Type (T))
6199 elsif Nkind (Parent (N)) = N_Subtype_Declaration
6200 or else not In_Private_Part (Scope (Base_Type (T)))
6202 Prepend_Elmt (T, Exchanged_Views);
6203 Exchange_Declarations (Etype (Get_Associated_Node (N)));
6206 -- For composite types with inconsistent representation exchange
6207 -- component types accordingly.
6209 elsif Is_Access_Type (T)
6210 and then Is_Private_Type (Designated_Type (T))
6211 and then not Has_Private_View (N)
6212 and then Present (Full_View (Designated_Type (T)))
6214 Switch_View (Designated_Type (T));
6216 elsif Is_Array_Type (T) then
6217 if Is_Private_Type (Component_Type (T))
6218 and then not Has_Private_View (N)
6219 and then Present (Full_View (Component_Type (T)))
6221 Switch_View (Component_Type (T));
6224 -- The normal exchange mechanism relies on the setting of a
6225 -- flag on the reference in the generic. However, an additional
6226 -- mechanism is needed for types that are not explicitly
6227 -- mentioned in the generic, but may be needed in expanded code
6228 -- in the instance. This includes component types of arrays and
6229 -- designated types of access types. This processing must also
6230 -- include the index types of arrays which we take care of here.
6237 Indx := First_Index (T);
6238 while Present (Indx) loop
6239 Typ := Base_Type (Etype (Indx));
6241 if Is_Private_Type (Typ)
6242 and then Present (Full_View (Typ))
6251 elsif Is_Private_Type (T)
6252 and then Present (Full_View (T))
6253 and then Is_Array_Type (Full_View (T))
6254 and then Is_Private_Type (Component_Type (Full_View (T)))
6258 -- Finally, a non-private subtype may have a private base type, which
6259 -- must be exchanged for consistency. This can happen when a package
6260 -- body is instantiated, when the scope stack is empty but in fact
6261 -- the subtype and the base type are declared in an enclosing scope.
6263 -- Note that in this case we introduce an inconsistency in the view
6264 -- set, because we switch the base type BT, but there could be some
6265 -- private dependent subtypes of BT which remain unswitched. Such
6266 -- subtypes might need to be switched at a later point (see specific
6267 -- provision for that case in Switch_View).
6269 elsif not Is_Private_Type (T)
6270 and then not Has_Private_View (N)
6271 and then Is_Private_Type (BT)
6272 and then Present (Full_View (BT))
6273 and then not Is_Generic_Type (BT)
6274 and then not In_Open_Scopes (BT)
6276 Prepend_Elmt (Full_View (BT), Exchanged_Views);
6277 Exchange_Declarations (BT);
6280 end Check_Private_View;
6282 -----------------------------
6283 -- Check_Hidden_Primitives --
6284 -----------------------------
6286 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is
6289 Result : Elist_Id := No_Elist;
6292 if No (Assoc_List) then
6296 -- Traverse the list of associations between formals and actuals
6297 -- searching for renamings of tagged types
6299 Actual := First (Assoc_List);
6300 while Present (Actual) loop
6301 if Nkind (Actual) = N_Subtype_Declaration then
6302 Gen_T := Generic_Parent_Type (Actual);
6305 and then Is_Tagged_Type (Gen_T)
6307 -- Traverse the list of primitives of the actual types
6308 -- searching for hidden primitives that are visible in the
6309 -- corresponding generic formal; leave them visible and
6310 -- append them to Result to restore their decoration later.
6312 Install_Hidden_Primitives
6313 (Prims_List => Result,
6315 Act_T => Entity (Subtype_Indication (Actual)));
6323 end Check_Hidden_Primitives;
6325 --------------------------
6326 -- Contains_Instance_Of --
6327 --------------------------
6329 function Contains_Instance_Of
6332 N : Node_Id) return Boolean
6340 -- Verify that there are no circular instantiations. We check whether
6341 -- the unit contains an instance of the current scope or some enclosing
6342 -- scope (in case one of the instances appears in a subunit). Longer
6343 -- circularities involving subunits might seem too pathological to
6344 -- consider, but they were not too pathological for the authors of
6345 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6346 -- enclosing generic scopes as containing an instance.
6349 -- Within a generic subprogram body, the scope is not generic, to
6350 -- allow for recursive subprograms. Use the declaration to determine
6351 -- whether this is a generic unit.
6353 if Ekind (Scop) = E_Generic_Package
6354 or else (Is_Subprogram (Scop)
6355 and then Nkind (Unit_Declaration_Node (Scop)) =
6356 N_Generic_Subprogram_Declaration)
6358 Elmt := First_Elmt (Inner_Instances (Inner));
6360 while Present (Elmt) loop
6361 if Node (Elmt) = Scop then
6362 Error_Msg_Node_2 := Inner;
6364 ("circular Instantiation: & instantiated within &!",
6368 elsif Node (Elmt) = Inner then
6371 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
6372 Error_Msg_Node_2 := Inner;
6374 ("circular Instantiation: & instantiated within &!",
6382 -- Indicate that Inner is being instantiated within Scop
6384 Append_Elmt (Inner, Inner_Instances (Scop));
6387 if Scop = Standard_Standard then
6390 Scop := Scope (Scop);
6395 end Contains_Instance_Of;
6397 -----------------------
6398 -- Copy_Generic_Node --
6399 -----------------------
6401 function Copy_Generic_Node
6403 Parent_Id : Node_Id;
6404 Instantiating : Boolean) return Node_Id
6409 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
6410 -- Check the given value of one of the Fields referenced by the current
6411 -- node to determine whether to copy it recursively. The field may hold
6412 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
6413 -- Char) in which case it need not be copied.
6415 procedure Copy_Descendants;
6416 -- Common utility for various nodes
6418 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
6419 -- Make copy of element list
6421 function Copy_Generic_List
6423 Parent_Id : Node_Id) return List_Id;
6424 -- Apply Copy_Node recursively to the members of a node list
6426 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
6427 -- True if an identifier is part of the defining program unit name of
6428 -- a child unit. The entity of such an identifier must be kept (for
6429 -- ASIS use) even though as the name of an enclosing generic it would
6430 -- otherwise not be preserved in the generic tree.
6432 ----------------------
6433 -- Copy_Descendants --
6434 ----------------------
6436 procedure Copy_Descendants is
6438 use Atree.Unchecked_Access;
6439 -- This code section is part of the implementation of an untyped
6440 -- tree traversal, so it needs direct access to node fields.
6443 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6444 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6445 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6446 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
6447 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6448 end Copy_Descendants;
6450 -----------------------------
6451 -- Copy_Generic_Descendant --
6452 -----------------------------
6454 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
6456 if D = Union_Id (Empty) then
6459 elsif D in Node_Range then
6461 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
6463 elsif D in List_Range then
6464 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
6466 elsif D in Elist_Range then
6467 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
6469 -- Nothing else is copyable (e.g. Uint values), return as is
6474 end Copy_Generic_Descendant;
6476 ------------------------
6477 -- Copy_Generic_Elist --
6478 ------------------------
6480 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
6487 M := First_Elmt (E);
6488 while Present (M) loop
6490 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6499 end Copy_Generic_Elist;
6501 -----------------------
6502 -- Copy_Generic_List --
6503 -----------------------
6505 function Copy_Generic_List
6507 Parent_Id : Node_Id) return List_Id
6515 Set_Parent (New_L, Parent_Id);
6518 while Present (N) loop
6519 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6528 end Copy_Generic_List;
6530 ---------------------------
6531 -- In_Defining_Unit_Name --
6532 ---------------------------
6534 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6536 return Present (Parent (Nam))
6537 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6539 (Nkind (Parent (Nam)) = N_Expanded_Name
6540 and then In_Defining_Unit_Name (Parent (Nam))));
6541 end In_Defining_Unit_Name;
6543 -- Start of processing for Copy_Generic_Node
6550 New_N := New_Copy (N);
6552 -- Copy aspects if present
6554 if Has_Aspects (N) then
6555 Set_Has_Aspects (New_N, False);
6556 Set_Aspect_Specifications
6557 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6560 if Instantiating then
6561 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6564 if not Is_List_Member (N) then
6565 Set_Parent (New_N, Parent_Id);
6568 -- If defining identifier, then all fields have been copied already
6570 if Nkind (New_N) in N_Entity then
6573 -- Special casing for identifiers and other entity names and operators
6575 elsif Nkind_In (New_N, N_Identifier,
6576 N_Character_Literal,
6579 or else Nkind (New_N) in N_Op
6581 if not Instantiating then
6583 -- Link both nodes in order to assign subsequently the entity of
6584 -- the copy to the original node, in case this is a global
6587 Set_Associated_Node (N, New_N);
6589 -- If we are within an instantiation, this is a nested generic
6590 -- that has already been analyzed at the point of definition.
6591 -- We must preserve references that were global to the enclosing
6592 -- parent at that point. Other occurrences, whether global or
6593 -- local to the current generic, must be resolved anew, so we
6594 -- reset the entity in the generic copy. A global reference has a
6595 -- smaller depth than the parent, or else the same depth in case
6596 -- both are distinct compilation units.
6598 -- A child unit is implicitly declared within the enclosing parent
6599 -- but is in fact global to it, and must be preserved.
6601 -- It is also possible for Current_Instantiated_Parent to be
6602 -- defined, and for this not to be a nested generic, namely if
6603 -- the unit is loaded through Rtsfind. In that case, the entity of
6604 -- New_N is only a link to the associated node, and not a defining
6607 -- The entities for parent units in the defining_program_unit of a
6608 -- generic child unit are established when the context of the unit
6609 -- is first analyzed, before the generic copy is made. They are
6610 -- preserved in the copy for use in ASIS queries.
6612 Ent := Entity (New_N);
6614 if No (Current_Instantiated_Parent.Gen_Id) then
6616 or else Nkind (Ent) /= N_Defining_Identifier
6617 or else not In_Defining_Unit_Name (N)
6619 Set_Associated_Node (New_N, Empty);
6624 not Nkind_In (Ent, N_Defining_Identifier,
6625 N_Defining_Character_Literal,
6626 N_Defining_Operator_Symbol)
6627 or else No (Scope (Ent))
6629 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6630 and then not Is_Child_Unit (Ent))
6632 (Scope_Depth (Scope (Ent)) >
6633 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6635 Get_Source_Unit (Ent) =
6636 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6638 Set_Associated_Node (New_N, Empty);
6641 -- Case of instantiating identifier or some other name or operator
6644 -- If the associated node is still defined, the entity in it
6645 -- is global, and must be copied to the instance. If this copy
6646 -- is being made for a body to inline, it is applied to an
6647 -- instantiated tree, and the entity is already present and
6648 -- must be also preserved.
6651 Assoc : constant Node_Id := Get_Associated_Node (N);
6654 if Present (Assoc) then
6655 if Nkind (Assoc) = Nkind (N) then
6656 Set_Entity (New_N, Entity (Assoc));
6657 Check_Private_View (N);
6659 -- The name in the call may be a selected component if the
6660 -- call has not been analyzed yet, as may be the case for
6661 -- pre/post conditions in a generic unit.
6663 elsif Nkind (Assoc) = N_Function_Call
6664 and then Is_Entity_Name (Name (Assoc))
6666 Set_Entity (New_N, Entity (Name (Assoc)));
6668 elsif Nkind_In (Assoc, N_Defining_Identifier,
6669 N_Defining_Character_Literal,
6670 N_Defining_Operator_Symbol)
6671 and then Expander_Active
6673 -- Inlining case: we are copying a tree that contains
6674 -- global entities, which are preserved in the copy to be
6675 -- used for subsequent inlining.
6680 Set_Entity (New_N, Empty);
6686 -- For expanded name, we must copy the Prefix and Selector_Name
6688 if Nkind (N) = N_Expanded_Name then
6690 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6692 Set_Selector_Name (New_N,
6693 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6695 -- For operators, we must copy the right operand
6697 elsif Nkind (N) in N_Op then
6698 Set_Right_Opnd (New_N,
6699 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6701 -- And for binary operators, the left operand as well
6703 if Nkind (N) in N_Binary_Op then
6704 Set_Left_Opnd (New_N,
6705 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6709 -- Special casing for stubs
6711 elsif Nkind (N) in N_Body_Stub then
6713 -- In any case, we must copy the specification or defining
6714 -- identifier as appropriate.
6716 if Nkind (N) = N_Subprogram_Body_Stub then
6717 Set_Specification (New_N,
6718 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6721 Set_Defining_Identifier (New_N,
6723 (Defining_Identifier (N), New_N, Instantiating));
6726 -- If we are not instantiating, then this is where we load and
6727 -- analyze subunits, i.e. at the point where the stub occurs. A
6728 -- more permissive system might defer this analysis to the point
6729 -- of instantiation, but this seems too complicated for now.
6731 if not Instantiating then
6733 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6735 Unum : Unit_Number_Type;
6739 -- Make sure that, if it is a subunit of the main unit that is
6740 -- preprocessed and if -gnateG is specified, the preprocessed
6741 -- file will be written.
6743 Lib.Analysing_Subunit_Of_Main :=
6744 Lib.In_Extended_Main_Source_Unit (N);
6747 (Load_Name => Subunit_Name,
6751 Lib.Analysing_Subunit_Of_Main := False;
6753 -- If the proper body is not found, a warning message will be
6754 -- emitted when analyzing the stub, or later at the point of
6755 -- instantiation. Here we just leave the stub as is.
6757 if Unum = No_Unit then
6758 Subunits_Missing := True;
6759 goto Subunit_Not_Found;
6762 Subunit := Cunit (Unum);
6764 if Nkind (Unit (Subunit)) /= N_Subunit then
6766 ("found child unit instead of expected SEPARATE subunit",
6768 Error_Msg_Sloc := Sloc (N);
6769 Error_Msg_N ("\to complete stub #", Subunit);
6770 goto Subunit_Not_Found;
6773 -- We must create a generic copy of the subunit, in order to
6774 -- perform semantic analysis on it, and we must replace the
6775 -- stub in the original generic unit with the subunit, in order
6776 -- to preserve non-local references within.
6778 -- Only the proper body needs to be copied. Library_Unit and
6779 -- context clause are simply inherited by the generic copy.
6780 -- Note that the copy (which may be recursive if there are
6781 -- nested subunits) must be done first, before attaching it to
6782 -- the enclosing generic.
6786 (Proper_Body (Unit (Subunit)),
6787 Empty, Instantiating => False);
6789 -- Now place the original proper body in the original generic
6790 -- unit. This is a body, not a compilation unit.
6792 Rewrite (N, Proper_Body (Unit (Subunit)));
6793 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6794 Set_Was_Originally_Stub (N);
6796 -- Finally replace the body of the subunit with its copy, and
6797 -- make this new subunit into the library unit of the generic
6798 -- copy, which does not have stubs any longer.
6800 Set_Proper_Body (Unit (Subunit), New_Body);
6801 Set_Library_Unit (New_N, Subunit);
6802 Inherit_Context (Unit (Subunit), N);
6805 -- If we are instantiating, this must be an error case, since
6806 -- otherwise we would have replaced the stub node by the proper body
6807 -- that corresponds. So just ignore it in the copy (i.e. we have
6808 -- copied it, and that is good enough).
6814 <<Subunit_Not_Found>> null;
6816 -- If the node is a compilation unit, it is the subunit of a stub, which
6817 -- has been loaded already (see code below). In this case, the library
6818 -- unit field of N points to the parent unit (which is a compilation
6819 -- unit) and need not (and cannot) be copied.
6821 -- When the proper body of the stub is analyzed, the library_unit link
6822 -- is used to establish the proper context (see sem_ch10).
6824 -- The other fields of a compilation unit are copied as usual
6826 elsif Nkind (N) = N_Compilation_Unit then
6828 -- This code can only be executed when not instantiating, because in
6829 -- the copy made for an instantiation, the compilation unit node has
6830 -- disappeared at the point that a stub is replaced by its proper
6833 pragma Assert (not Instantiating);
6835 Set_Context_Items (New_N,
6836 Copy_Generic_List (Context_Items (N), New_N));
6839 Copy_Generic_Node (Unit (N), New_N, False));
6841 Set_First_Inlined_Subprogram (New_N,
6843 (First_Inlined_Subprogram (N), New_N, False));
6845 Set_Aux_Decls_Node (New_N,
6846 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6848 -- For an assignment node, the assignment is known to be semantically
6849 -- legal if we are instantiating the template. This avoids incorrect
6850 -- diagnostics in generated code.
6852 elsif Nkind (N) = N_Assignment_Statement then
6854 -- Copy name and expression fields in usual manner
6857 Copy_Generic_Node (Name (N), New_N, Instantiating));
6859 Set_Expression (New_N,
6860 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6862 if Instantiating then
6863 Set_Assignment_OK (Name (New_N), True);
6866 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6867 if not Instantiating then
6868 Set_Associated_Node (N, New_N);
6871 if Present (Get_Associated_Node (N))
6872 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6874 -- In the generic the aggregate has some composite type. If at
6875 -- the point of instantiation the type has a private view,
6876 -- install the full view (and that of its ancestors, if any).
6879 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6884 and then Is_Private_Type (T)
6890 and then Is_Tagged_Type (T)
6891 and then Is_Derived_Type (T)
6893 Rt := Root_Type (T);
6898 if Is_Private_Type (T) then
6909 -- Do not copy the associated node, which points to the generic copy
6910 -- of the aggregate.
6913 use Atree.Unchecked_Access;
6914 -- This code section is part of the implementation of an untyped
6915 -- tree traversal, so it needs direct access to node fields.
6918 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6919 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6920 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6921 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6924 -- Allocators do not have an identifier denoting the access type, so we
6925 -- must locate it through the expression to check whether the views are
6928 elsif Nkind (N) = N_Allocator
6929 and then Nkind (Expression (N)) = N_Qualified_Expression
6930 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6931 and then Instantiating
6934 T : constant Node_Id :=
6935 Get_Associated_Node (Subtype_Mark (Expression (N)));
6941 -- Retrieve the allocator node in the generic copy
6943 Acc_T := Etype (Parent (Parent (T)));
6945 and then Is_Private_Type (Acc_T)
6947 Switch_View (Acc_T);
6954 -- For a proper body, we must catch the case of a proper body that
6955 -- replaces a stub. This represents the point at which a separate
6956 -- compilation unit, and hence template file, may be referenced, so we
6957 -- must make a new source instantiation entry for the template of the
6958 -- subunit, and ensure that all nodes in the subunit are adjusted using
6959 -- this new source instantiation entry.
6961 elsif Nkind (N) in N_Proper_Body then
6963 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6966 if Instantiating and then Was_Originally_Stub (N) then
6967 Create_Instantiation_Source
6968 (Instantiation_Node,
6969 Defining_Entity (N),
6974 -- Now copy the fields of the proper body, using the new
6975 -- adjustment factor if one was needed as per test above.
6979 -- Restore the original adjustment factor in case changed
6981 S_Adjustment := Save_Adjustment;
6984 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6985 -- generic unit, not to the instantiating unit.
6987 elsif Nkind (N) = N_Pragma and then Instantiating then
6989 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6991 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6992 New_N := Make_Null_Statement (Sloc (N));
6998 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
7000 -- No descendant fields need traversing
7004 elsif Nkind (N) = N_String_Literal
7005 and then Present (Etype (N))
7006 and then Instantiating
7008 -- If the string is declared in an outer scope, the string_literal
7009 -- subtype created for it may have the wrong scope. We force the
7010 -- reanalysis of the constant to generate a new itype in the proper
7013 Set_Etype (New_N, Empty);
7014 Set_Analyzed (New_N, False);
7016 -- For the remaining nodes, copy their descendants recursively
7021 if Instantiating and then Nkind (N) = N_Subprogram_Body then
7022 Set_Generic_Parent (Specification (New_N), N);
7024 -- Should preserve Corresponding_Spec??? (12.3(14))
7029 end Copy_Generic_Node;
7031 ----------------------------
7032 -- Denotes_Formal_Package --
7033 ----------------------------
7035 function Denotes_Formal_Package
7037 On_Exit : Boolean := False;
7038 Instance : Entity_Id := Empty) return Boolean
7041 Scop : constant Entity_Id := Scope (Pack);
7044 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
7045 -- The package in question may be an actual for a previous formal
7046 -- package P of the current instance, so examine its actuals as well.
7047 -- This must be recursive over other formal packages.
7049 ----------------------------------
7050 -- Is_Actual_Of_Previous_Formal --
7051 ----------------------------------
7053 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
7057 E1 := First_Entity (P);
7058 while Present (E1) and then E1 /= Instance loop
7059 if Ekind (E1) = E_Package
7060 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
7062 if Renamed_Object (E1) = Pack then
7065 elsif E1 = P or else Renamed_Object (E1) = P then
7068 elsif Is_Actual_Of_Previous_Formal (E1) then
7077 end Is_Actual_Of_Previous_Formal;
7079 -- Start of processing for Denotes_Formal_Package
7085 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
7087 Par := Current_Instantiated_Parent.Act_Id;
7090 if Ekind (Scop) = E_Generic_Package
7091 or else Nkind (Unit_Declaration_Node (Scop)) =
7092 N_Generic_Subprogram_Declaration
7096 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
7097 N_Formal_Package_Declaration
7105 -- Check whether this package is associated with a formal package of
7106 -- the enclosing instantiation. Iterate over the list of renamings.
7108 E := First_Entity (Par);
7109 while Present (E) loop
7110 if Ekind (E) /= E_Package
7111 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
7115 elsif Renamed_Object (E) = Par then
7118 elsif Renamed_Object (E) = Pack then
7121 elsif Is_Actual_Of_Previous_Formal (E) then
7131 end Denotes_Formal_Package;
7137 procedure End_Generic is
7139 -- ??? More things could be factored out in this routine. Should
7140 -- probably be done at a later stage.
7142 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
7143 Generic_Flags.Decrement_Last;
7145 Expander_Mode_Restore;
7152 function Earlier (N1, N2 : Node_Id) return Boolean is
7153 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
7154 -- Find distance from given node to enclosing compilation unit
7160 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
7163 and then Nkind (P) /= N_Compilation_Unit
7165 P := True_Parent (P);
7170 -- Local declarations
7179 -- Start of processing for Earlier
7182 Find_Depth (P1, D1);
7183 Find_Depth (P2, D2);
7193 P1 := True_Parent (P1);
7198 P2 := True_Parent (P2);
7202 -- At this point P1 and P2 are at the same distance from the root.
7203 -- We examine their parents until we find a common declarative list.
7204 -- If we reach the root, N1 and N2 do not descend from the same
7205 -- declarative list (e.g. one is nested in the declarative part and
7206 -- the other is in a block in the statement part) and the earlier
7207 -- one is already frozen.
7209 while not Is_List_Member (P1)
7210 or else not Is_List_Member (P2)
7211 or else List_Containing (P1) /= List_Containing (P2)
7213 P1 := True_Parent (P1);
7214 P2 := True_Parent (P2);
7216 if Nkind (Parent (P1)) = N_Subunit then
7217 P1 := Corresponding_Stub (Parent (P1));
7220 if Nkind (Parent (P2)) = N_Subunit then
7221 P2 := Corresponding_Stub (Parent (P2));
7229 -- Expanded code usually shares the source location of the original
7230 -- construct it was generated for. This however may not necessarely
7231 -- reflect the true location of the code within the tree.
7233 -- Before comparing the slocs of the two nodes, make sure that we are
7234 -- working with correct source locations. Assume that P1 is to the left
7235 -- of P2. If either one does not come from source, traverse the common
7236 -- list heading towards the other node and locate the first source
7240 -- ----+===+===+--------------+===+===+----
7241 -- expanded code expanded code
7243 if not Comes_From_Source (P1) then
7244 while Present (P1) loop
7246 -- Neither P2 nor a source statement were located during the
7247 -- search. If we reach the end of the list, then P1 does not
7248 -- occur earlier than P2.
7251 -- start --- P2 ----- P1 --- end
7253 if No (Next (P1)) then
7256 -- We encounter P2 while going to the right of the list. This
7257 -- means that P1 does indeed appear earlier.
7260 -- start --- P1 ===== P2 --- end
7261 -- expanded code in between
7266 -- No need to look any further since we have located a source
7269 elsif Comes_From_Source (P1) then
7279 if not Comes_From_Source (P2) then
7280 while Present (P2) loop
7282 -- Neither P1 nor a source statement were located during the
7283 -- search. If we reach the start of the list, then P1 does not
7284 -- occur earlier than P2.
7287 -- start --- P2 --- P1 --- end
7289 if No (Prev (P2)) then
7292 -- We encounter P1 while going to the left of the list. This
7293 -- means that P1 does indeed appear earlier.
7296 -- start --- P1 ===== P2 --- end
7297 -- expanded code in between
7302 -- No need to look any further since we have located a source
7305 elsif Comes_From_Source (P2) then
7315 -- At this point either both nodes came from source or we approximated
7316 -- their source locations through neighbouring source statements.
7318 T1 := Top_Level_Location (Sloc (P1));
7319 T2 := Top_Level_Location (Sloc (P2));
7321 -- When two nodes come from the same instance, they have identical top
7322 -- level locations. To determine proper relation within the tree, check
7323 -- their locations within the template.
7326 return Sloc (P1) < Sloc (P2);
7328 -- The two nodes either come from unrelated instances or do not come
7329 -- from instantiated code at all.
7336 ----------------------
7337 -- Find_Actual_Type --
7338 ----------------------
7340 function Find_Actual_Type
7342 Gen_Type : Entity_Id) return Entity_Id
7344 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
7348 -- Special processing only applies to child units
7350 if not Is_Child_Unit (Gen_Scope) then
7351 return Get_Instance_Of (Typ);
7353 -- If designated or component type is itself a formal of the child unit,
7354 -- its instance is available.
7356 elsif Scope (Typ) = Gen_Scope then
7357 return Get_Instance_Of (Typ);
7359 -- If the array or access type is not declared in the parent unit,
7360 -- no special processing needed.
7362 elsif not Is_Generic_Type (Typ)
7363 and then Scope (Gen_Scope) /= Scope (Typ)
7365 return Get_Instance_Of (Typ);
7367 -- Otherwise, retrieve designated or component type by visibility
7370 T := Current_Entity (Typ);
7371 while Present (T) loop
7372 if In_Open_Scopes (Scope (T)) then
7375 elsif Is_Generic_Actual_Type (T) then
7384 end Find_Actual_Type;
7386 ----------------------------
7387 -- Freeze_Subprogram_Body --
7388 ----------------------------
7390 procedure Freeze_Subprogram_Body
7391 (Inst_Node : Node_Id;
7393 Pack_Id : Entity_Id)
7395 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7396 Par : constant Entity_Id := Scope (Gen_Unit);
7402 function Enclosing_Package_Body (N : Node_Id) return Node_Id;
7403 -- Find innermost package body that encloses the given node, and which
7404 -- is not a compilation unit. Freeze nodes for the instance, or for its
7405 -- enclosing body, may be inserted after the enclosing_body of the
7406 -- generic unit. Used to determine proper placement of freeze node for
7407 -- both package and subprogram instances.
7409 function Package_Freeze_Node (B : Node_Id) return Node_Id;
7410 -- Find entity for given package body, and locate or create a freeze
7413 ----------------------------
7414 -- Enclosing_Package_Body --
7415 ----------------------------
7417 function Enclosing_Package_Body (N : Node_Id) return Node_Id is
7423 and then Nkind (Parent (P)) /= N_Compilation_Unit
7425 if Nkind (P) = N_Package_Body then
7426 if Nkind (Parent (P)) = N_Subunit then
7427 return Corresponding_Stub (Parent (P));
7433 P := True_Parent (P);
7437 end Enclosing_Package_Body;
7439 -------------------------
7440 -- Package_Freeze_Node --
7441 -------------------------
7443 function Package_Freeze_Node (B : Node_Id) return Node_Id is
7447 if Nkind (B) = N_Package_Body then
7448 Id := Corresponding_Spec (B);
7449 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
7450 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
7453 Ensure_Freeze_Node (Id);
7454 return Freeze_Node (Id);
7455 end Package_Freeze_Node;
7457 -- Start of processing of Freeze_Subprogram_Body
7460 -- If the instance and the generic body appear within the same unit, and
7461 -- the instance precedes the generic, the freeze node for the instance
7462 -- must appear after that of the generic. If the generic is nested
7463 -- within another instance I2, then current instance must be frozen
7464 -- after I2. In both cases, the freeze nodes are those of enclosing
7465 -- packages. Otherwise, the freeze node is placed at the end of the
7466 -- current declarative part.
7468 Enc_G := Enclosing_Package_Body (Gen_Body);
7469 Enc_I := Enclosing_Package_Body (Inst_Node);
7470 Ensure_Freeze_Node (Pack_Id);
7471 F_Node := Freeze_Node (Pack_Id);
7473 if Is_Generic_Instance (Par)
7474 and then Present (Freeze_Node (Par))
7475 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
7477 -- The parent was a premature instantiation. Insert freeze node at
7478 -- the end the current declarative part.
7480 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
7481 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7483 -- Handle the following case:
7485 -- package Parent_Inst is new ...
7488 -- procedure P ... -- this body freezes Parent_Inst
7490 -- package Inst is new ...
7492 -- In this particular scenario, the freeze node for Inst must be
7493 -- inserted in the same manner as that of Parent_Inst - before the
7494 -- next source body or at the end of the declarative list (body not
7495 -- available). If body P did not exist and Parent_Inst was frozen
7496 -- after Inst, either by a body following Inst or at the end of the
7497 -- declarative region, the freeze node for Inst must be inserted
7498 -- after that of Parent_Inst. This relation is established by
7499 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7501 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
7502 List_Containing (Inst_Node)
7503 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
7505 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7508 Insert_After (Freeze_Node (Par), F_Node);
7511 -- The body enclosing the instance should be frozen after the body that
7512 -- includes the generic, because the body of the instance may make
7513 -- references to entities therein. If the two are not in the same
7514 -- declarative part, or if the one enclosing the instance is frozen
7515 -- already, freeze the instance at the end of the current declarative
7518 elsif Is_Generic_Instance (Par)
7519 and then Present (Freeze_Node (Par))
7520 and then Present (Enc_I)
7522 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
7524 (Nkind (Enc_I) = N_Package_Body
7526 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
7528 -- The enclosing package may contain several instances. Rather
7529 -- than computing the earliest point at which to insert its freeze
7530 -- node, we place it at the end of the declarative part of the
7531 -- parent of the generic.
7533 Insert_Freeze_Node_For_Instance
7534 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
7537 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7539 elsif Present (Enc_G)
7540 and then Present (Enc_I)
7541 and then Enc_G /= Enc_I
7542 and then Earlier (Inst_Node, Gen_Body)
7544 if Nkind (Enc_G) = N_Package_Body then
7545 E_G_Id := Corresponding_Spec (Enc_G);
7546 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
7548 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
7551 -- Freeze package that encloses instance, and place node after the
7552 -- package that encloses generic. If enclosing package is already
7553 -- frozen we have to assume it is at the proper place. This may be a
7554 -- potential ABE that requires dynamic checking. Do not add a freeze
7555 -- node if the package that encloses the generic is inside the body
7556 -- that encloses the instance, because the freeze node would be in
7557 -- the wrong scope. Additional contortions needed if the bodies are
7558 -- within a subunit.
7561 Enclosing_Body : Node_Id;
7564 if Nkind (Enc_I) = N_Package_Body_Stub then
7565 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
7567 Enclosing_Body := Enc_I;
7570 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
7571 Insert_Freeze_Node_For_Instance
7572 (Enc_G, Package_Freeze_Node (Enc_I));
7576 -- Freeze enclosing subunit before instance
7578 Ensure_Freeze_Node (E_G_Id);
7580 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7581 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7584 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7587 -- If none of the above, insert freeze node at the end of the current
7588 -- declarative part.
7590 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7592 end Freeze_Subprogram_Body;
7598 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7600 return Generic_Renamings.Table (E).Gen_Id;
7603 ---------------------
7604 -- Get_Instance_Of --
7605 ---------------------
7607 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7608 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7611 if Res /= Assoc_Null then
7612 return Generic_Renamings.Table (Res).Act_Id;
7614 -- On exit, entity is not instantiated: not a generic parameter, or
7615 -- else parameter of an inner generic unit.
7619 end Get_Instance_Of;
7621 ------------------------------------
7622 -- Get_Package_Instantiation_Node --
7623 ------------------------------------
7625 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7626 Decl : Node_Id := Unit_Declaration_Node (A);
7630 -- If the Package_Instantiation attribute has been set on the package
7631 -- entity, then use it directly when it (or its Original_Node) refers
7632 -- to an N_Package_Instantiation node. In principle it should be
7633 -- possible to have this field set in all cases, which should be
7634 -- investigated, and would allow this function to be significantly
7637 Inst := Package_Instantiation (A);
7639 if Present (Inst) then
7640 if Nkind (Inst) = N_Package_Instantiation then
7643 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7644 return Original_Node (Inst);
7648 -- If the instantiation is a compilation unit that does not need body
7649 -- then the instantiation node has been rewritten as a package
7650 -- declaration for the instance, and we return the original node.
7652 -- If it is a compilation unit and the instance node has not been
7653 -- rewritten, then it is still the unit of the compilation. Finally, if
7654 -- a body is present, this is a parent of the main unit whose body has
7655 -- been compiled for inlining purposes, and the instantiation node has
7656 -- been rewritten with the instance body.
7658 -- Otherwise the instantiation node appears after the declaration. If
7659 -- the entity is a formal package, the declaration may have been
7660 -- rewritten as a generic declaration (in the case of a formal with box)
7661 -- or left as a formal package declaration if it has actuals, and is
7662 -- found with a forward search.
7664 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7665 if Nkind (Decl) = N_Package_Declaration
7666 and then Present (Corresponding_Body (Decl))
7668 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7671 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7672 return Original_Node (Decl);
7674 return Unit (Parent (Decl));
7677 elsif Nkind (Decl) = N_Package_Declaration
7678 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7680 return Original_Node (Decl);
7683 Inst := Next (Decl);
7684 while not Nkind_In (Inst, N_Package_Instantiation,
7685 N_Formal_Package_Declaration)
7692 end Get_Package_Instantiation_Node;
7694 ------------------------
7695 -- Has_Been_Exchanged --
7696 ------------------------
7698 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7702 Next := First_Elmt (Exchanged_Views);
7703 while Present (Next) loop
7704 if Full_View (Node (Next)) = E then
7712 end Has_Been_Exchanged;
7718 function Hash (F : Entity_Id) return HTable_Range is
7720 return HTable_Range (F mod HTable_Size);
7723 ------------------------
7724 -- Hide_Current_Scope --
7725 ------------------------
7727 procedure Hide_Current_Scope is
7728 C : constant Entity_Id := Current_Scope;
7732 Set_Is_Hidden_Open_Scope (C);
7734 E := First_Entity (C);
7735 while Present (E) loop
7736 if Is_Immediately_Visible (E) then
7737 Set_Is_Immediately_Visible (E, False);
7738 Append_Elmt (E, Hidden_Entities);
7744 -- Make the scope name invisible as well. This is necessary, but might
7745 -- conflict with calls to Rtsfind later on, in case the scope is a
7746 -- predefined one. There is no clean solution to this problem, so for
7747 -- now we depend on the user not redefining Standard itself in one of
7748 -- the parent units.
7750 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7751 Set_Is_Immediately_Visible (C, False);
7752 Append_Elmt (C, Hidden_Entities);
7755 end Hide_Current_Scope;
7761 procedure Init_Env is
7762 Saved : Instance_Env;
7765 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7766 Saved.Exchanged_Views := Exchanged_Views;
7767 Saved.Hidden_Entities := Hidden_Entities;
7768 Saved.Current_Sem_Unit := Current_Sem_Unit;
7769 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7770 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7772 -- Save configuration switches. These may be reset if the unit is a
7773 -- predefined unit, and the current mode is not Ada 2005.
7775 Save_Opt_Config_Switches (Saved.Switches);
7777 Instance_Envs.Append (Saved);
7779 Exchanged_Views := New_Elmt_List;
7780 Hidden_Entities := New_Elmt_List;
7782 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7783 -- this is set properly in Set_Instance_Env.
7785 Current_Instantiated_Parent :=
7786 (Current_Scope, Current_Scope, Assoc_Null);
7789 ------------------------------
7790 -- In_Same_Declarative_Part --
7791 ------------------------------
7793 function In_Same_Declarative_Part
7795 Inst : Node_Id) return Boolean
7797 Decls : constant Node_Id := Parent (F_Node);
7798 Nod : Node_Id := Parent (Inst);
7801 while Present (Nod) loop
7805 elsif Nkind_In (Nod, N_Subprogram_Body,
7807 N_Package_Declaration,
7814 elsif Nkind (Nod) = N_Subunit then
7815 Nod := Corresponding_Stub (Nod);
7817 elsif Nkind (Nod) = N_Compilation_Unit then
7821 Nod := Parent (Nod);
7826 end In_Same_Declarative_Part;
7828 ---------------------
7829 -- In_Main_Context --
7830 ---------------------
7832 function In_Main_Context (E : Entity_Id) return Boolean is
7838 if not Is_Compilation_Unit (E)
7839 or else Ekind (E) /= E_Package
7840 or else In_Private_Part (E)
7845 Context := Context_Items (Cunit (Main_Unit));
7847 Clause := First (Context);
7848 while Present (Clause) loop
7849 if Nkind (Clause) = N_With_Clause then
7850 Nam := Name (Clause);
7852 -- If the current scope is part of the context of the main unit,
7853 -- analysis of the corresponding with_clause is not complete, and
7854 -- the entity is not set. We use the Chars field directly, which
7855 -- might produce false positives in rare cases, but guarantees
7856 -- that we produce all the instance bodies we will need.
7858 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7859 or else (Nkind (Nam) = N_Selected_Component
7860 and then Chars (Selector_Name (Nam)) = Chars (E))
7870 end In_Main_Context;
7872 ---------------------
7873 -- Inherit_Context --
7874 ---------------------
7876 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7877 Current_Context : List_Id;
7878 Current_Unit : Node_Id;
7887 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7889 -- The inherited context is attached to the enclosing compilation
7890 -- unit. This is either the main unit, or the declaration for the
7891 -- main unit (in case the instantiation appears within the package
7892 -- declaration and the main unit is its body).
7894 Current_Unit := Parent (Inst);
7895 while Present (Current_Unit)
7896 and then Nkind (Current_Unit) /= N_Compilation_Unit
7898 Current_Unit := Parent (Current_Unit);
7901 Current_Context := Context_Items (Current_Unit);
7903 Item := First (Context_Items (Parent (Gen_Decl)));
7904 while Present (Item) loop
7905 if Nkind (Item) = N_With_Clause then
7906 Lib_Unit := Library_Unit (Item);
7908 -- Take care to prevent direct cyclic with's
7910 if Lib_Unit /= Current_Unit then
7912 -- Do not add a unit if it is already in the context
7914 Clause := First (Current_Context);
7916 while Present (Clause) loop
7917 if Nkind (Clause) = N_With_Clause and then
7918 Library_Unit (Clause) = Lib_Unit
7928 New_I := New_Copy (Item);
7929 Set_Implicit_With (New_I, True);
7930 Set_Implicit_With_From_Instantiation (New_I, True);
7931 Append (New_I, Current_Context);
7939 end Inherit_Context;
7945 procedure Initialize is
7947 Generic_Renamings.Init;
7950 Generic_Renamings_HTable.Reset;
7951 Circularity_Detected := False;
7952 Exchanged_Views := No_Elist;
7953 Hidden_Entities := No_Elist;
7956 -------------------------------------
7957 -- Insert_Freeze_Node_For_Instance --
7958 -------------------------------------
7960 procedure Insert_Freeze_Node_For_Instance
7969 function Enclosing_Body (N : Node_Id) return Node_Id;
7970 -- Find enclosing package or subprogram body, if any. Freeze node may
7971 -- be placed at end of current declarative list if previous instance
7972 -- and current one have different enclosing bodies.
7974 function Previous_Instance (Gen : Entity_Id) return Entity_Id;
7975 -- Find the local instance, if any, that declares the generic that is
7976 -- being instantiated. If present, the freeze node for this instance
7977 -- must follow the freeze node for the previous instance.
7979 --------------------
7980 -- Enclosing_Body --
7981 --------------------
7983 function Enclosing_Body (N : Node_Id) return Node_Id is
7989 and then Nkind (Parent (P)) /= N_Compilation_Unit
7991 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then
7992 if Nkind (Parent (P)) = N_Subunit then
7993 return Corresponding_Stub (Parent (P));
7999 P := True_Parent (P);
8005 -----------------------
8006 -- Previous_Instance --
8007 -----------------------
8009 function Previous_Instance (Gen : Entity_Id) return Entity_Id is
8015 and then S /= Standard_Standard
8017 if Is_Generic_Instance (S)
8018 and then In_Same_Source_Unit (S, N)
8027 end Previous_Instance;
8029 -- Start of processing for Insert_Freeze_Node_For_Instance
8032 if not Is_List_Member (F_Node) then
8034 Decls := List_Containing (N);
8035 Inst := Entity (F_Node);
8036 Par_N := Parent (Decls);
8038 -- When processing a subprogram instantiation, utilize the actual
8039 -- subprogram instantiation rather than its package wrapper as it
8040 -- carries all the context information.
8042 if Is_Wrapper_Package (Inst) then
8043 Inst := Related_Instance (Inst);
8046 -- If this is a package instance, check whether the generic is
8047 -- declared in a previous instance and the current instance is
8048 -- not within the previous one.
8050 if Present (Generic_Parent (Parent (Inst)))
8051 and then Is_In_Main_Unit (N)
8054 Enclosing_N : constant Node_Id := Enclosing_Body (N);
8055 Par_I : constant Entity_Id :=
8057 (Generic_Parent (Parent (Inst)));
8062 and then Earlier (N, Freeze_Node (Par_I))
8064 Scop := Scope (Inst);
8066 -- If the current instance is within the one that contains
8067 -- the generic, the freeze node for the current one must
8068 -- appear in the current declarative part. Ditto, if the
8069 -- current instance is within another package instance or
8070 -- within a body that does not enclose the current instance.
8071 -- In these three cases the freeze node of the previous
8072 -- instance is not relevant.
8074 while Present (Scop)
8075 and then Scop /= Standard_Standard
8077 exit when Scop = Par_I
8079 (Is_Generic_Instance (Scop)
8080 and then Scope_Depth (Scop) > Scope_Depth (Par_I));
8081 Scop := Scope (Scop);
8084 -- Previous instance encloses current instance
8086 if Scop = Par_I then
8089 -- If the next node is a source body we must freeze in
8090 -- the current scope as well.
8092 elsif Present (Next (N))
8093 and then Nkind_In (Next (N),
8094 N_Subprogram_Body, N_Package_Body)
8095 and then Comes_From_Source (Next (N))
8099 -- Current instance is within an unrelated instance
8101 elsif Is_Generic_Instance (Scop) then
8104 -- Current instance is within an unrelated body
8106 elsif Present (Enclosing_N)
8107 and then Enclosing_N /= Enclosing_Body (Par_I)
8112 Insert_After (Freeze_Node (Par_I), F_Node);
8119 -- When the instantiation occurs in a package declaration, append the
8120 -- freeze node to the private declarations (if any).
8122 if Nkind (Par_N) = N_Package_Specification
8123 and then Decls = Visible_Declarations (Par_N)
8124 and then Present (Private_Declarations (Par_N))
8125 and then not Is_Empty_List (Private_Declarations (Par_N))
8127 Decls := Private_Declarations (Par_N);
8128 Decl := First (Decls);
8131 -- Determine the proper freeze point of a package instantiation. We
8132 -- adhere to the general rule of a package or subprogram body causing
8133 -- freezing of anything before it in the same declarative region. In
8134 -- this case, the proper freeze point of a package instantiation is
8135 -- before the first source body which follows, or before a stub. This
8136 -- ensures that entities coming from the instance are already frozen
8137 -- and usable in source bodies.
8139 if Nkind (Par_N) /= N_Package_Declaration
8140 and then Ekind (Inst) = E_Package
8141 and then Is_Generic_Instance (Inst)
8143 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
8145 while Present (Decl) loop
8146 if (Nkind (Decl) in N_Unit_Body
8148 Nkind (Decl) in N_Body_Stub)
8149 and then Comes_From_Source (Decl)
8151 Insert_Before (Decl, F_Node);
8159 -- In a package declaration, or if no previous body, insert at end
8162 Set_Sloc (F_Node, Sloc (Last (Decls)));
8163 Insert_After (Last (Decls), F_Node);
8165 end Insert_Freeze_Node_For_Instance;
8171 procedure Install_Body
8172 (Act_Body : Node_Id;
8177 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
8178 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
8179 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
8180 Par : constant Entity_Id := Scope (Gen_Id);
8181 Gen_Unit : constant Node_Id :=
8182 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
8183 Orig_Body : Node_Id := Gen_Body;
8185 Body_Unit : Node_Id;
8187 Must_Delay : Boolean;
8189 function In_Same_Enclosing_Subp return Boolean;
8190 -- Check whether instance and generic body are within same subprogram.
8192 function True_Sloc (N : Node_Id) return Source_Ptr;
8193 -- If the instance is nested inside a generic unit, the Sloc of the
8194 -- instance indicates the place of the original definition, not the
8195 -- point of the current enclosing instance. Pending a better usage of
8196 -- Slocs to indicate instantiation places, we determine the place of
8197 -- origin of a node by finding the maximum sloc of any ancestor node.
8198 -- Why is this not equivalent to Top_Level_Location ???
8200 ----------------------------
8201 -- In_Same_Enclosing_Subp --
8202 ----------------------------
8204 function In_Same_Enclosing_Subp return Boolean is
8209 Scop := Scope (Act_Id);
8210 while Scop /= Standard_Standard
8211 and then not Is_Overloadable (Scop)
8213 Scop := Scope (Scop);
8216 if Scop = Standard_Standard then
8222 Scop := Scope (Gen_Id);
8223 while Scop /= Standard_Standard loop
8227 Scop := Scope (Scop);
8232 end In_Same_Enclosing_Subp;
8238 function True_Sloc (N : Node_Id) return Source_Ptr is
8245 while Present (N1) and then N1 /= Act_Unit loop
8246 if Sloc (N1) > Res then
8256 -- Start of processing for Install_Body
8259 -- If the body is a subunit, the freeze point is the corresponding stub
8260 -- in the current compilation, not the subunit itself.
8262 if Nkind (Parent (Gen_Body)) = N_Subunit then
8263 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
8265 Orig_Body := Gen_Body;
8268 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
8270 -- If the instantiation and the generic definition appear in the same
8271 -- package declaration, this is an early instantiation. If they appear
8272 -- in the same declarative part, it is an early instantiation only if
8273 -- the generic body appears textually later, and the generic body is
8274 -- also in the main unit.
8276 -- If instance is nested within a subprogram, and the generic body
8277 -- is not, the instance is delayed because the enclosing body is. If
8278 -- instance and body are within the same scope, or the same subprogram
8279 -- body, indicate explicitly that the instance is delayed.
8282 (Gen_Unit = Act_Unit
8283 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
8284 N_Generic_Package_Declaration)
8285 or else (Gen_Unit = Body_Unit
8286 and then True_Sloc (N) < Sloc (Orig_Body)))
8287 and then Is_In_Main_Unit (Gen_Unit)
8288 and then (Scope (Act_Id) = Scope (Gen_Id)
8289 or else In_Same_Enclosing_Subp));
8291 -- If this is an early instantiation, the freeze node is placed after
8292 -- the generic body. Otherwise, if the generic appears in an instance,
8293 -- we cannot freeze the current instance until the outer one is frozen.
8294 -- This is only relevant if the current instance is nested within some
8295 -- inner scope not itself within the outer instance. If this scope is
8296 -- a package body in the same declarative part as the outer instance,
8297 -- then that body needs to be frozen after the outer instance. Finally,
8298 -- if no delay is needed, we place the freeze node at the end of the
8299 -- current declarative part.
8301 if Expander_Active then
8302 Ensure_Freeze_Node (Act_Id);
8303 F_Node := Freeze_Node (Act_Id);
8306 Insert_After (Orig_Body, F_Node);
8308 elsif Is_Generic_Instance (Par)
8309 and then Present (Freeze_Node (Par))
8310 and then Scope (Act_Id) /= Par
8312 -- Freeze instance of inner generic after instance of enclosing
8315 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
8317 -- Handle the following case:
8319 -- package Parent_Inst is new ...
8322 -- procedure P ... -- this body freezes Parent_Inst
8324 -- package Inst is new ...
8326 -- In this particular scenario, the freeze node for Inst must
8327 -- be inserted in the same manner as that of Parent_Inst,
8328 -- before the next source body or at the end of the declarative
8329 -- list (body not available). If body P did not exist and
8330 -- Parent_Inst was frozen after Inst, either by a body
8331 -- following Inst or at the end of the declarative region,
8332 -- the freeze node for Inst must be inserted after that of
8333 -- Parent_Inst. This relation is established by comparing
8334 -- the Slocs of Parent_Inst freeze node and Inst.
8336 if List_Containing (Get_Package_Instantiation_Node (Par)) =
8338 and then Sloc (Freeze_Node (Par)) < Sloc (N)
8340 Insert_Freeze_Node_For_Instance (N, F_Node);
8342 Insert_After (Freeze_Node (Par), F_Node);
8345 -- Freeze package enclosing instance of inner generic after
8346 -- instance of enclosing generic.
8348 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body)
8349 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
8352 Enclosing : Entity_Id;
8355 Enclosing := Corresponding_Spec (Parent (N));
8357 if No (Enclosing) then
8358 Enclosing := Defining_Entity (Parent (N));
8361 Insert_Freeze_Node_For_Instance (N, F_Node);
8362 Ensure_Freeze_Node (Enclosing);
8364 if not Is_List_Member (Freeze_Node (Enclosing)) then
8366 -- The enclosing context is a subunit, insert the freeze
8367 -- node after the stub.
8369 if Nkind (Parent (Parent (N))) = N_Subunit then
8370 Insert_Freeze_Node_For_Instance
8371 (Corresponding_Stub (Parent (Parent (N))),
8372 Freeze_Node (Enclosing));
8374 -- The enclosing context is a package with a stub body
8375 -- which has already been replaced by the real body.
8376 -- Insert the freeze node after the actual body.
8378 elsif Ekind (Enclosing) = E_Package
8379 and then Present (Body_Entity (Enclosing))
8380 and then Was_Originally_Stub
8381 (Parent (Body_Entity (Enclosing)))
8383 Insert_Freeze_Node_For_Instance
8384 (Parent (Body_Entity (Enclosing)),
8385 Freeze_Node (Enclosing));
8387 -- The parent instance has been frozen before the body of
8388 -- the enclosing package, insert the freeze node after
8391 elsif List_Containing (Freeze_Node (Par)) =
8392 List_Containing (Parent (N))
8393 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
8395 Insert_Freeze_Node_For_Instance
8396 (Parent (N), Freeze_Node (Enclosing));
8400 (Freeze_Node (Par), Freeze_Node (Enclosing));
8406 Insert_Freeze_Node_For_Instance (N, F_Node);
8410 Insert_Freeze_Node_For_Instance (N, F_Node);
8414 Set_Is_Frozen (Act_Id);
8415 Insert_Before (N, Act_Body);
8416 Mark_Rewrite_Insertion (Act_Body);
8419 -----------------------------
8420 -- Install_Formal_Packages --
8421 -----------------------------
8423 procedure Install_Formal_Packages (Par : Entity_Id) is
8426 Gen_E : Entity_Id := Empty;
8429 E := First_Entity (Par);
8431 -- If we are installing an instance parent, locate the formal packages
8432 -- of its generic parent.
8434 if Is_Generic_Instance (Par) then
8435 Gen := Generic_Parent (Package_Specification (Par));
8436 Gen_E := First_Entity (Gen);
8439 while Present (E) loop
8440 if Ekind (E) = E_Package
8441 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
8443 -- If this is the renaming for the parent instance, done
8445 if Renamed_Object (E) = Par then
8448 -- The visibility of a formal of an enclosing generic is already
8451 elsif Denotes_Formal_Package (E) then
8454 elsif Present (Associated_Formal_Package (E)) then
8455 Check_Generic_Actuals (Renamed_Object (E), True);
8456 Set_Is_Hidden (E, False);
8458 -- Find formal package in generic unit that corresponds to
8459 -- (instance of) formal package in instance.
8461 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
8462 Next_Entity (Gen_E);
8465 if Present (Gen_E) then
8466 Map_Formal_Package_Entities (Gen_E, E);
8472 if Present (Gen_E) then
8473 Next_Entity (Gen_E);
8476 end Install_Formal_Packages;
8478 --------------------
8479 -- Install_Parent --
8480 --------------------
8482 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
8483 Ancestors : constant Elist_Id := New_Elmt_List;
8484 S : constant Entity_Id := Current_Scope;
8485 Inst_Par : Entity_Id;
8486 First_Par : Entity_Id;
8487 Inst_Node : Node_Id;
8488 Gen_Par : Entity_Id;
8489 First_Gen : Entity_Id;
8492 procedure Install_Noninstance_Specs (Par : Entity_Id);
8493 -- Install the scopes of noninstance parent units ending with Par
8495 procedure Install_Spec (Par : Entity_Id);
8496 -- The child unit is within the declarative part of the parent, so the
8497 -- declarations within the parent are immediately visible.
8499 -------------------------------
8500 -- Install_Noninstance_Specs --
8501 -------------------------------
8503 procedure Install_Noninstance_Specs (Par : Entity_Id) is
8506 and then Par /= Standard_Standard
8507 and then not In_Open_Scopes (Par)
8509 Install_Noninstance_Specs (Scope (Par));
8512 end Install_Noninstance_Specs;
8518 procedure Install_Spec (Par : Entity_Id) is
8519 Spec : constant Node_Id := Package_Specification (Par);
8522 -- If this parent of the child instance is a top-level unit,
8523 -- then record the unit and its visibility for later resetting in
8524 -- Remove_Parent. We exclude units that are generic instances, as we
8525 -- only want to record this information for the ultimate top-level
8526 -- noninstance parent (is that always correct???).
8528 if Scope (Par) = Standard_Standard
8529 and then not Is_Generic_Instance (Par)
8531 Parent_Unit_Visible := Is_Immediately_Visible (Par);
8532 Instance_Parent_Unit := Par;
8535 -- Open the parent scope and make it and its declarations visible.
8536 -- If this point is not within a body, then only the visible
8537 -- declarations should be made visible, and installation of the
8538 -- private declarations is deferred until the appropriate point
8539 -- within analysis of the spec being instantiated (see the handling
8540 -- of parent visibility in Analyze_Package_Specification). This is
8541 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8542 -- private view problems that occur when compiling instantiations of
8543 -- a generic child of that package (Generic_Dispatching_Constructor).
8544 -- If the instance freezes a tagged type, inlinings of operations
8545 -- from Ada.Tags may need the full view of type Tag. If inlining took
8546 -- proper account of establishing visibility of inlined subprograms'
8547 -- parents then it should be possible to remove this
8548 -- special check. ???
8551 Set_Is_Immediately_Visible (Par);
8552 Install_Visible_Declarations (Par);
8553 Set_Use (Visible_Declarations (Spec));
8555 if In_Body or else Is_RTU (Par, Ada_Tags) then
8556 Install_Private_Declarations (Par);
8557 Set_Use (Private_Declarations (Spec));
8561 -- Start of processing for Install_Parent
8564 -- We need to install the parent instance to compile the instantiation
8565 -- of the child, but the child instance must appear in the current
8566 -- scope. Given that we cannot place the parent above the current scope
8567 -- in the scope stack, we duplicate the current scope and unstack both
8568 -- after the instantiation is complete.
8570 -- If the parent is itself the instantiation of a child unit, we must
8571 -- also stack the instantiation of its parent, and so on. Each such
8572 -- ancestor is the prefix of the name in a prior instantiation.
8574 -- If this is a nested instance, the parent unit itself resolves to
8575 -- a renaming of the parent instance, whose declaration we need.
8577 -- Finally, the parent may be a generic (not an instance) when the
8578 -- child unit appears as a formal package.
8582 if Present (Renamed_Entity (Inst_Par)) then
8583 Inst_Par := Renamed_Entity (Inst_Par);
8586 First_Par := Inst_Par;
8588 Gen_Par := Generic_Parent (Package_Specification (Inst_Par));
8590 First_Gen := Gen_Par;
8592 while Present (Gen_Par)
8593 and then Is_Child_Unit (Gen_Par)
8595 -- Load grandparent instance as well
8597 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
8599 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
8600 Inst_Par := Entity (Prefix (Name (Inst_Node)));
8602 if Present (Renamed_Entity (Inst_Par)) then
8603 Inst_Par := Renamed_Entity (Inst_Par);
8606 Gen_Par := Generic_Parent (Package_Specification (Inst_Par));
8608 if Present (Gen_Par) then
8609 Prepend_Elmt (Inst_Par, Ancestors);
8612 -- Parent is not the name of an instantiation
8614 Install_Noninstance_Specs (Inst_Par);
8625 if Present (First_Gen) then
8626 Append_Elmt (First_Par, Ancestors);
8628 Install_Noninstance_Specs (First_Par);
8631 if not Is_Empty_Elmt_List (Ancestors) then
8632 Elmt := First_Elmt (Ancestors);
8633 while Present (Elmt) loop
8634 Install_Spec (Node (Elmt));
8635 Install_Formal_Packages (Node (Elmt));
8645 -------------------------------
8646 -- Install_Hidden_Primitives --
8647 -------------------------------
8649 procedure Install_Hidden_Primitives
8650 (Prims_List : in out Elist_Id;
8655 List : Elist_Id := No_Elist;
8656 Prim_G_Elmt : Elmt_Id;
8657 Prim_A_Elmt : Elmt_Id;
8662 -- No action needed in case of serious errors because we cannot trust
8663 -- in the order of primitives
8665 if Serious_Errors_Detected > 0 then
8668 -- No action possible if we don't have available the list of primitive
8672 or else not Is_Record_Type (Gen_T)
8673 or else not Is_Tagged_Type (Gen_T)
8674 or else not Is_Record_Type (Act_T)
8675 or else not Is_Tagged_Type (Act_T)
8679 -- There is no need to handle interface types since their primitives
8682 elsif Is_Interface (Gen_T) then
8686 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T));
8688 if not Is_Class_Wide_Type (Act_T) then
8689 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T));
8691 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T)));
8695 -- Skip predefined primitives in the generic formal
8697 while Present (Prim_G_Elmt)
8698 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt))
8700 Next_Elmt (Prim_G_Elmt);
8703 -- Skip predefined primitives in the generic actual
8705 while Present (Prim_A_Elmt)
8706 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt))
8708 Next_Elmt (Prim_A_Elmt);
8711 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt);
8713 Prim_G := Node (Prim_G_Elmt);
8714 Prim_A := Node (Prim_A_Elmt);
8716 -- There is no need to handle interface primitives because their
8717 -- primitives are not hidden
8719 exit when Present (Interface_Alias (Prim_G));
8721 -- Here we install one hidden primitive
8723 if Chars (Prim_G) /= Chars (Prim_A)
8724 and then Has_Suffix (Prim_A, 'P')
8725 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G)
8727 Set_Chars (Prim_A, Chars (Prim_G));
8729 if List = No_Elist then
8730 List := New_Elmt_List;
8733 Append_Elmt (Prim_A, List);
8736 Next_Elmt (Prim_A_Elmt);
8737 Next_Elmt (Prim_G_Elmt);
8740 -- Append the elements to the list of temporarily visible primitives
8741 -- avoiding duplicates.
8743 if Present (List) then
8744 if No (Prims_List) then
8745 Prims_List := New_Elmt_List;
8748 Elmt := First_Elmt (List);
8749 while Present (Elmt) loop
8750 Append_Unique_Elmt (Node (Elmt), Prims_List);
8754 end Install_Hidden_Primitives;
8756 -------------------------------
8757 -- Restore_Hidden_Primitives --
8758 -------------------------------
8760 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is
8761 Prim_Elmt : Elmt_Id;
8765 if Prims_List /= No_Elist then
8766 Prim_Elmt := First_Elmt (Prims_List);
8767 while Present (Prim_Elmt) loop
8768 Prim := Node (Prim_Elmt);
8769 Set_Chars (Prim, Add_Suffix (Prim, 'P'));
8770 Next_Elmt (Prim_Elmt);
8773 Prims_List := No_Elist;
8775 end Restore_Hidden_Primitives;
8777 --------------------------------
8778 -- Instantiate_Formal_Package --
8779 --------------------------------
8781 function Instantiate_Formal_Package
8784 Analyzed_Formal : Node_Id) return List_Id
8786 Loc : constant Source_Ptr := Sloc (Actual);
8787 Actual_Pack : Entity_Id;
8788 Formal_Pack : Entity_Id;
8789 Gen_Parent : Entity_Id;
8792 Parent_Spec : Node_Id;
8794 procedure Find_Matching_Actual
8796 Act : in out Entity_Id);
8797 -- We need to associate each formal entity in the formal package with
8798 -- the corresponding entity in the actual package. The actual package
8799 -- has been analyzed and possibly expanded, and as a result there is
8800 -- no one-to-one correspondence between the two lists (for example,
8801 -- the actual may include subtypes, itypes, and inherited primitive
8802 -- operations, interspersed among the renaming declarations for the
8803 -- actuals) . We retrieve the corresponding actual by name because each
8804 -- actual has the same name as the formal, and they do appear in the
8807 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
8808 -- Retrieve entity of defining entity of generic formal parameter.
8809 -- Only the declarations of formals need to be considered when
8810 -- linking them to actuals, but the declarative list may include
8811 -- internal entities generated during analysis, and those are ignored.
8813 procedure Match_Formal_Entity
8814 (Formal_Node : Node_Id;
8815 Formal_Ent : Entity_Id;
8816 Actual_Ent : Entity_Id);
8817 -- Associates the formal entity with the actual. In the case where
8818 -- Formal_Ent is a formal package, this procedure iterates through all
8819 -- of its formals and enters associations between the actuals occurring
8820 -- in the formal package's corresponding actual package (given by
8821 -- Actual_Ent) and the formal package's formal parameters. This
8822 -- procedure recurses if any of the parameters is itself a package.
8824 function Is_Instance_Of
8825 (Act_Spec : Entity_Id;
8826 Gen_Anc : Entity_Id) return Boolean;
8827 -- The actual can be an instantiation of a generic within another
8828 -- instance, in which case there is no direct link from it to the
8829 -- original generic ancestor. In that case, we recognize that the
8830 -- ultimate ancestor is the same by examining names and scopes.
8832 procedure Process_Nested_Formal (Formal : Entity_Id);
8833 -- If the current formal is declared with a box, its own formals are
8834 -- visible in the instance, as they were in the generic, and their
8835 -- Hidden flag must be reset. If some of these formals are themselves
8836 -- packages declared with a box, the processing must be recursive.
8838 --------------------------
8839 -- Find_Matching_Actual --
8840 --------------------------
8842 procedure Find_Matching_Actual
8844 Act : in out Entity_Id)
8846 Formal_Ent : Entity_Id;
8849 case Nkind (Original_Node (F)) is
8850 when N_Formal_Object_Declaration |
8851 N_Formal_Type_Declaration =>
8852 Formal_Ent := Defining_Identifier (F);
8854 while Chars (Act) /= Chars (Formal_Ent) loop
8858 when N_Formal_Subprogram_Declaration |
8859 N_Formal_Package_Declaration |
8860 N_Package_Declaration |
8861 N_Generic_Package_Declaration =>
8862 Formal_Ent := Defining_Entity (F);
8864 while Chars (Act) /= Chars (Formal_Ent) loop
8869 raise Program_Error;
8871 end Find_Matching_Actual;
8873 -------------------------
8874 -- Match_Formal_Entity --
8875 -------------------------
8877 procedure Match_Formal_Entity
8878 (Formal_Node : Node_Id;
8879 Formal_Ent : Entity_Id;
8880 Actual_Ent : Entity_Id)
8882 Act_Pkg : Entity_Id;
8885 Set_Instance_Of (Formal_Ent, Actual_Ent);
8887 if Ekind (Actual_Ent) = E_Package then
8889 -- Record associations for each parameter
8891 Act_Pkg := Actual_Ent;
8894 A_Ent : Entity_Id := First_Entity (Act_Pkg);
8903 -- Retrieve the actual given in the formal package declaration
8905 Actual := Entity (Name (Original_Node (Formal_Node)));
8907 -- The actual in the formal package declaration may be a
8908 -- renamed generic package, in which case we want to retrieve
8909 -- the original generic in order to traverse its formal part.
8911 if Present (Renamed_Entity (Actual)) then
8912 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8914 Gen_Decl := Unit_Declaration_Node (Actual);
8917 Formals := Generic_Formal_Declarations (Gen_Decl);
8919 if Present (Formals) then
8920 F_Node := First_Non_Pragma (Formals);
8925 while Present (A_Ent)
8926 and then Present (F_Node)
8927 and then A_Ent /= First_Private_Entity (Act_Pkg)
8929 F_Ent := Get_Formal_Entity (F_Node);
8931 if Present (F_Ent) then
8933 -- This is a formal of the original package. Record
8934 -- association and recurse.
8936 Find_Matching_Actual (F_Node, A_Ent);
8937 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8938 Next_Entity (A_Ent);
8941 Next_Non_Pragma (F_Node);
8945 end Match_Formal_Entity;
8947 -----------------------
8948 -- Get_Formal_Entity --
8949 -----------------------
8951 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8952 Kind : constant Node_Kind := Nkind (Original_Node (N));
8955 when N_Formal_Object_Declaration =>
8956 return Defining_Identifier (N);
8958 when N_Formal_Type_Declaration =>
8959 return Defining_Identifier (N);
8961 when N_Formal_Subprogram_Declaration =>
8962 return Defining_Unit_Name (Specification (N));
8964 when N_Formal_Package_Declaration =>
8965 return Defining_Identifier (Original_Node (N));
8967 when N_Generic_Package_Declaration =>
8968 return Defining_Identifier (Original_Node (N));
8970 -- All other declarations are introduced by semantic analysis and
8971 -- have no match in the actual.
8976 end Get_Formal_Entity;
8978 --------------------
8979 -- Is_Instance_Of --
8980 --------------------
8982 function Is_Instance_Of
8983 (Act_Spec : Entity_Id;
8984 Gen_Anc : Entity_Id) return Boolean
8986 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8989 if No (Gen_Par) then
8992 -- Simplest case: the generic parent of the actual is the formal
8994 elsif Gen_Par = Gen_Anc then
8997 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
9000 -- The actual may be obtained through several instantiations. Its
9001 -- scope must itself be an instance of a generic declared in the
9002 -- same scope as the formal. Any other case is detected above.
9004 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
9008 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
9012 ---------------------------
9013 -- Process_Nested_Formal --
9014 ---------------------------
9016 procedure Process_Nested_Formal (Formal : Entity_Id) is
9020 if Present (Associated_Formal_Package (Formal))
9021 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9023 Ent := First_Entity (Formal);
9024 while Present (Ent) loop
9025 Set_Is_Hidden (Ent, False);
9026 Set_Is_Visible_Formal (Ent);
9027 Set_Is_Potentially_Use_Visible
9028 (Ent, Is_Potentially_Use_Visible (Formal));
9030 if Ekind (Ent) = E_Package then
9031 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
9032 Process_Nested_Formal (Ent);
9038 end Process_Nested_Formal;
9040 -- Start of processing for Instantiate_Formal_Package
9045 if not Is_Entity_Name (Actual)
9046 or else Ekind (Entity (Actual)) /= E_Package
9049 ("expect package instance to instantiate formal", Actual);
9050 Abandon_Instantiation (Actual);
9051 raise Program_Error;
9054 Actual_Pack := Entity (Actual);
9055 Set_Is_Instantiated (Actual_Pack);
9057 -- The actual may be a renamed package, or an outer generic formal
9058 -- package whose instantiation is converted into a renaming.
9060 if Present (Renamed_Object (Actual_Pack)) then
9061 Actual_Pack := Renamed_Object (Actual_Pack);
9064 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
9065 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
9066 Formal_Pack := Defining_Identifier (Analyzed_Formal);
9069 Generic_Parent (Specification (Analyzed_Formal));
9071 Defining_Unit_Name (Specification (Analyzed_Formal));
9074 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
9075 Parent_Spec := Package_Specification (Actual_Pack);
9077 Parent_Spec := Parent (Actual_Pack);
9080 if Gen_Parent = Any_Id then
9082 ("previous error in declaration of formal package", Actual);
9083 Abandon_Instantiation (Actual);
9086 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
9092 ("actual parameter must be instance of&", Actual, Gen_Parent);
9093 Abandon_Instantiation (Actual);
9096 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
9097 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
9100 Make_Package_Renaming_Declaration (Loc,
9101 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
9102 Name => New_Occurrence_Of (Actual_Pack, Loc));
9104 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
9105 Defining_Identifier (Formal));
9106 Decls := New_List (Nod);
9108 -- If the formal F has a box, then the generic declarations are
9109 -- visible in the generic G. In an instance of G, the corresponding
9110 -- entities in the actual for F (which are the actuals for the
9111 -- instantiation of the generic that F denotes) must also be made
9112 -- visible for analysis of the current instance. On exit from the
9113 -- current instance, those entities are made private again. If the
9114 -- actual is currently in use, these entities are also use-visible.
9116 -- The loop through the actual entities also steps through the formal
9117 -- entities and enters associations from formals to actuals into the
9118 -- renaming map. This is necessary to properly handle checking of
9119 -- actual parameter associations for later formals that depend on
9120 -- actuals declared in the formal package.
9122 -- In Ada 2005, partial parameterization requires that we make
9123 -- visible the actuals corresponding to formals that were defaulted
9124 -- in the formal package. There formals are identified because they
9125 -- remain formal generics within the formal package, rather than
9126 -- being renamings of the actuals supplied.
9129 Gen_Decl : constant Node_Id :=
9130 Unit_Declaration_Node (Gen_Parent);
9131 Formals : constant List_Id :=
9132 Generic_Formal_Declarations (Gen_Decl);
9134 Actual_Ent : Entity_Id;
9135 Actual_Of_Formal : Node_Id;
9136 Formal_Node : Node_Id;
9137 Formal_Ent : Entity_Id;
9140 if Present (Formals) then
9141 Formal_Node := First_Non_Pragma (Formals);
9143 Formal_Node := Empty;
9146 Actual_Ent := First_Entity (Actual_Pack);
9148 First (Visible_Declarations (Specification (Analyzed_Formal)));
9149 while Present (Actual_Ent)
9150 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9152 if Present (Formal_Node) then
9153 Formal_Ent := Get_Formal_Entity (Formal_Node);
9155 if Present (Formal_Ent) then
9156 Find_Matching_Actual (Formal_Node, Actual_Ent);
9158 (Formal_Node, Formal_Ent, Actual_Ent);
9160 -- We iterate at the same time over the actuals of the
9161 -- local package created for the formal, to determine
9162 -- which one of the formals of the original generic were
9163 -- defaulted in the formal. The corresponding actual
9164 -- entities are visible in the enclosing instance.
9166 if Box_Present (Formal)
9168 (Present (Actual_Of_Formal)
9171 (Get_Formal_Entity (Actual_Of_Formal)))
9173 Set_Is_Hidden (Actual_Ent, False);
9174 Set_Is_Visible_Formal (Actual_Ent);
9175 Set_Is_Potentially_Use_Visible
9176 (Actual_Ent, In_Use (Actual_Pack));
9178 if Ekind (Actual_Ent) = E_Package then
9179 Process_Nested_Formal (Actual_Ent);
9183 Set_Is_Hidden (Actual_Ent);
9184 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
9188 Next_Non_Pragma (Formal_Node);
9189 Next (Actual_Of_Formal);
9192 -- No further formals to match, but the generic part may
9193 -- contain inherited operation that are not hidden in the
9194 -- enclosing instance.
9196 Next_Entity (Actual_Ent);
9200 -- Inherited subprograms generated by formal derived types are
9201 -- also visible if the types are.
9203 Actual_Ent := First_Entity (Actual_Pack);
9204 while Present (Actual_Ent)
9205 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9207 if Is_Overloadable (Actual_Ent)
9209 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
9211 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
9213 Set_Is_Hidden (Actual_Ent, False);
9214 Set_Is_Potentially_Use_Visible
9215 (Actual_Ent, In_Use (Actual_Pack));
9218 Next_Entity (Actual_Ent);
9222 -- If the formal is not declared with a box, reanalyze it as an
9223 -- abbreviated instantiation, to verify the matching rules of 12.7.
9224 -- The actual checks are performed after the generic associations
9225 -- have been analyzed, to guarantee the same visibility for this
9226 -- instantiation and for the actuals.
9228 -- In Ada 2005, the generic associations for the formal can include
9229 -- defaulted parameters. These are ignored during check. This
9230 -- internal instantiation is removed from the tree after conformance
9231 -- checking, because it contains formal declarations for those
9232 -- defaulted parameters, and those should not reach the back-end.
9234 if not Box_Present (Formal) then
9236 I_Pack : constant Entity_Id :=
9237 Make_Temporary (Sloc (Actual), 'P');
9240 Set_Is_Internal (I_Pack);
9243 Make_Package_Instantiation (Sloc (Actual),
9244 Defining_Unit_Name => I_Pack,
9247 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
9248 Generic_Associations =>
9249 Generic_Associations (Formal)));
9255 end Instantiate_Formal_Package;
9257 -----------------------------------
9258 -- Instantiate_Formal_Subprogram --
9259 -----------------------------------
9261 function Instantiate_Formal_Subprogram
9264 Analyzed_Formal : Node_Id) return Node_Id
9267 Formal_Sub : constant Entity_Id :=
9268 Defining_Unit_Name (Specification (Formal));
9269 Analyzed_S : constant Entity_Id :=
9270 Defining_Unit_Name (Specification (Analyzed_Formal));
9271 Decl_Node : Node_Id;
9275 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
9276 -- If the generic is a child unit, the parent has been installed on the
9277 -- scope stack, but a default subprogram cannot resolve to something
9278 -- on the parent because that parent is not really part of the visible
9279 -- context (it is there to resolve explicit local entities). If the
9280 -- default has resolved in this way, we remove the entity from immediate
9281 -- visibility and analyze the node again to emit an error message or
9282 -- find another visible candidate.
9284 procedure Valid_Actual_Subprogram (Act : Node_Id);
9285 -- Perform legality check and raise exception on failure
9287 -----------------------
9288 -- From_Parent_Scope --
9289 -----------------------
9291 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
9292 Gen_Scope : Node_Id;
9295 Gen_Scope := Scope (Analyzed_S);
9296 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop
9297 if Scope (Subp) = Scope (Gen_Scope) then
9301 Gen_Scope := Scope (Gen_Scope);
9305 end From_Parent_Scope;
9307 -----------------------------
9308 -- Valid_Actual_Subprogram --
9309 -----------------------------
9311 procedure Valid_Actual_Subprogram (Act : Node_Id) is
9315 if Is_Entity_Name (Act) then
9316 Act_E := Entity (Act);
9318 elsif Nkind (Act) = N_Selected_Component
9319 and then Is_Entity_Name (Selector_Name (Act))
9321 Act_E := Entity (Selector_Name (Act));
9327 if (Present (Act_E) and then Is_Overloadable (Act_E))
9328 or else Nkind_In (Act, N_Attribute_Reference,
9329 N_Indexed_Component,
9330 N_Character_Literal,
9331 N_Explicit_Dereference)
9337 ("expect subprogram or entry name in instantiation of&",
9338 Instantiation_Node, Formal_Sub);
9339 Abandon_Instantiation (Instantiation_Node);
9341 end Valid_Actual_Subprogram;
9343 -- Start of processing for Instantiate_Formal_Subprogram
9346 New_Spec := New_Copy_Tree (Specification (Formal));
9348 -- The tree copy has created the proper instantiation sloc for the
9349 -- new specification. Use this location for all other constructed
9352 Loc := Sloc (Defining_Unit_Name (New_Spec));
9354 -- Create new entity for the actual (New_Copy_Tree does not)
9356 Set_Defining_Unit_Name
9357 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9359 -- Create new entities for the each of the formals in the
9360 -- specification of the renaming declaration built for the actual.
9362 if Present (Parameter_Specifications (New_Spec)) then
9366 F := First (Parameter_Specifications (New_Spec));
9367 while Present (F) loop
9368 Set_Defining_Identifier (F,
9369 Make_Defining_Identifier (Sloc (F),
9370 Chars => Chars (Defining_Identifier (F))));
9376 -- Find entity of actual. If the actual is an attribute reference, it
9377 -- cannot be resolved here (its formal is missing) but is handled
9378 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9379 -- fully resolved subsequently, when the renaming declaration for the
9380 -- formal is analyzed. If it is an explicit dereference, resolve the
9381 -- prefix but not the actual itself, to prevent interpretation as call.
9383 if Present (Actual) then
9384 Loc := Sloc (Actual);
9385 Set_Sloc (New_Spec, Loc);
9387 if Nkind (Actual) = N_Operator_Symbol then
9388 Find_Direct_Name (Actual);
9390 elsif Nkind (Actual) = N_Explicit_Dereference then
9391 Analyze (Prefix (Actual));
9393 elsif Nkind (Actual) /= N_Attribute_Reference then
9397 Valid_Actual_Subprogram (Actual);
9400 elsif Present (Default_Name (Formal)) then
9401 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
9402 N_Selected_Component,
9403 N_Indexed_Component,
9404 N_Character_Literal)
9405 and then Present (Entity (Default_Name (Formal)))
9407 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
9409 Nam := New_Copy (Default_Name (Formal));
9410 Set_Sloc (Nam, Loc);
9413 elsif Box_Present (Formal) then
9415 -- Actual is resolved at the point of instantiation. Create an
9416 -- identifier or operator with the same name as the formal.
9418 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
9419 Nam := Make_Operator_Symbol (Loc,
9420 Chars => Chars (Formal_Sub),
9421 Strval => No_String);
9423 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
9426 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
9427 and then Null_Present (Specification (Formal))
9429 -- Generate null body for procedure, for use in the instance
9432 Make_Subprogram_Body (Loc,
9433 Specification => New_Spec,
9434 Declarations => New_List,
9435 Handled_Statement_Sequence =>
9436 Make_Handled_Sequence_Of_Statements (Loc,
9437 Statements => New_List (Make_Null_Statement (Loc))));
9439 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
9443 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
9445 ("missing actual&", Instantiation_Node, Formal_Sub);
9447 ("\in instantiation of & declared#",
9448 Instantiation_Node, Scope (Analyzed_S));
9449 Abandon_Instantiation (Instantiation_Node);
9453 Make_Subprogram_Renaming_Declaration (Loc,
9454 Specification => New_Spec,
9457 -- If we do not have an actual and the formal specified <> then set to
9458 -- get proper default.
9460 if No (Actual) and then Box_Present (Formal) then
9461 Set_From_Default (Decl_Node);
9464 -- Gather possible interpretations for the actual before analyzing the
9465 -- instance. If overloaded, it will be resolved when analyzing the
9466 -- renaming declaration.
9468 if Box_Present (Formal)
9469 and then No (Actual)
9473 if Is_Child_Unit (Scope (Analyzed_S))
9474 and then Present (Entity (Nam))
9476 if not Is_Overloaded (Nam) then
9477 if From_Parent_Scope (Entity (Nam)) then
9478 Set_Is_Immediately_Visible (Entity (Nam), False);
9479 Set_Entity (Nam, Empty);
9480 Set_Etype (Nam, Empty);
9483 Set_Is_Immediately_Visible (Entity (Nam));
9492 Get_First_Interp (Nam, I, It);
9493 while Present (It.Nam) loop
9494 if From_Parent_Scope (It.Nam) then
9498 Get_Next_Interp (I, It);
9505 -- The generic instantiation freezes the actual. This can only be done
9506 -- once the actual is resolved, in the analysis of the renaming
9507 -- declaration. To make the formal subprogram entity available, we set
9508 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9509 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9510 -- of formal abstract subprograms.
9512 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
9514 -- We cannot analyze the renaming declaration, and thus find the actual,
9515 -- until all the actuals are assembled in the instance. For subsequent
9516 -- checks of other actuals, indicate the node that will hold the
9517 -- instance of this formal.
9519 Set_Instance_Of (Analyzed_S, Nam);
9521 if Nkind (Actual) = N_Selected_Component
9522 and then Is_Task_Type (Etype (Prefix (Actual)))
9523 and then not Is_Frozen (Etype (Prefix (Actual)))
9525 -- The renaming declaration will create a body, which must appear
9526 -- outside of the instantiation, We move the renaming declaration
9527 -- out of the instance, and create an additional renaming inside,
9528 -- to prevent freezing anomalies.
9531 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
9534 Set_Defining_Unit_Name (New_Spec, Anon_Id);
9535 Insert_Before (Instantiation_Node, Decl_Node);
9536 Analyze (Decl_Node);
9538 -- Now create renaming within the instance
9541 Make_Subprogram_Renaming_Declaration (Loc,
9542 Specification => New_Copy_Tree (New_Spec),
9543 Name => New_Occurrence_Of (Anon_Id, Loc));
9545 Set_Defining_Unit_Name (Specification (Decl_Node),
9546 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9551 end Instantiate_Formal_Subprogram;
9553 ------------------------
9554 -- Instantiate_Object --
9555 ------------------------
9557 function Instantiate_Object
9560 Analyzed_Formal : Node_Id) return List_Id
9562 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
9563 A_Gen_Obj : constant Entity_Id :=
9564 Defining_Identifier (Analyzed_Formal);
9565 Acc_Def : Node_Id := Empty;
9566 Act_Assoc : constant Node_Id := Parent (Actual);
9567 Actual_Decl : Node_Id := Empty;
9568 Decl_Node : Node_Id;
9571 List : constant List_Id := New_List;
9572 Loc : constant Source_Ptr := Sloc (Actual);
9573 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
9574 Subt_Decl : Node_Id := Empty;
9575 Subt_Mark : Node_Id := Empty;
9578 if Present (Subtype_Mark (Formal)) then
9579 Subt_Mark := Subtype_Mark (Formal);
9581 Check_Access_Definition (Formal);
9582 Acc_Def := Access_Definition (Formal);
9585 -- Sloc for error message on missing actual
9587 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
9589 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
9590 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
9593 Set_Parent (List, Parent (Actual));
9597 if Out_Present (Formal) then
9599 -- An IN OUT generic actual must be a name. The instantiation is a
9600 -- renaming declaration. The actual is the name being renamed. We
9601 -- use the actual directly, rather than a copy, because it is not
9602 -- used further in the list of actuals, and because a copy or a use
9603 -- of relocate_node is incorrect if the instance is nested within a
9604 -- generic. In order to simplify ASIS searches, the Generic_Parent
9605 -- field links the declaration to the generic association.
9610 Instantiation_Node, Gen_Obj);
9612 ("\in instantiation of & declared#",
9613 Instantiation_Node, Scope (A_Gen_Obj));
9614 Abandon_Instantiation (Instantiation_Node);
9617 if Present (Subt_Mark) then
9619 Make_Object_Renaming_Declaration (Loc,
9620 Defining_Identifier => New_Copy (Gen_Obj),
9621 Subtype_Mark => New_Copy_Tree (Subt_Mark),
9624 else pragma Assert (Present (Acc_Def));
9626 Make_Object_Renaming_Declaration (Loc,
9627 Defining_Identifier => New_Copy (Gen_Obj),
9628 Access_Definition => New_Copy_Tree (Acc_Def),
9632 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9634 -- The analysis of the actual may produce Insert_Action nodes, so
9635 -- the declaration must have a context in which to attach them.
9637 Append (Decl_Node, List);
9640 -- Return if the analysis of the actual reported some error
9642 if Etype (Actual) = Any_Type then
9646 -- This check is performed here because Analyze_Object_Renaming will
9647 -- not check it when Comes_From_Source is False. Note though that the
9648 -- check for the actual being the name of an object will be performed
9649 -- in Analyze_Object_Renaming.
9651 if Is_Object_Reference (Actual)
9652 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
9655 ("illegal discriminant-dependent component for in out parameter",
9659 -- The actual has to be resolved in order to check that it is a
9660 -- variable (due to cases such as F (1), where F returns access to
9661 -- an array, and for overloaded prefixes).
9663 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
9665 -- If the type of the formal is not itself a formal, and the current
9666 -- unit is a child unit, the formal type must be declared in a
9667 -- parent, and must be retrieved by visibility.
9670 and then Is_Generic_Unit (Scope (Ftyp))
9671 and then Is_Child_Unit (Scope (A_Gen_Obj))
9674 Temp : constant Node_Id :=
9675 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
9677 Set_Entity (Temp, Empty);
9679 Ftyp := Entity (Temp);
9683 if Is_Private_Type (Ftyp)
9684 and then not Is_Private_Type (Etype (Actual))
9685 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
9686 or else Base_Type (Etype (Actual)) = Ftyp)
9688 -- If the actual has the type of the full view of the formal, or
9689 -- else a non-private subtype of the formal, then the visibility
9690 -- of the formal type has changed. Add to the actuals a subtype
9691 -- declaration that will force the exchange of views in the body
9692 -- of the instance as well.
9695 Make_Subtype_Declaration (Loc,
9696 Defining_Identifier => Make_Temporary (Loc, 'P'),
9697 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
9699 Prepend (Subt_Decl, List);
9701 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
9702 Exchange_Declarations (Ftyp);
9705 Resolve (Actual, Ftyp);
9707 if not Denotes_Variable (Actual) then
9709 ("actual for& must be a variable", Actual, Gen_Obj);
9711 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
9713 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
9714 -- the type of the actual shall resolve to a specific anonymous
9717 if Ada_Version < Ada_2005
9719 Ekind (Base_Type (Ftyp)) /=
9720 E_Anonymous_Access_Type
9722 Ekind (Base_Type (Etype (Actual))) /=
9723 E_Anonymous_Access_Type
9725 Error_Msg_NE ("type of actual does not match type of&",
9730 Note_Possible_Modification (Actual, Sure => True);
9732 -- Check for instantiation of atomic/volatile actual for
9733 -- non-atomic/volatile formal (RM C.6 (12)).
9735 if Is_Atomic_Object (Actual)
9736 and then not Is_Atomic (Orig_Ftyp)
9739 ("cannot instantiate non-atomic formal object " &
9740 "with atomic actual", Actual);
9742 elsif Is_Volatile_Object (Actual)
9743 and then not Is_Volatile (Orig_Ftyp)
9746 ("cannot instantiate non-volatile formal object " &
9747 "with volatile actual", Actual);
9750 -- Formal in-parameter
9753 -- The instantiation of a generic formal in-parameter is constant
9754 -- declaration. The actual is the expression for that declaration.
9756 if Present (Actual) then
9757 if Present (Subt_Mark) then
9759 else pragma Assert (Present (Acc_Def));
9764 Make_Object_Declaration (Loc,
9765 Defining_Identifier => New_Copy (Gen_Obj),
9766 Constant_Present => True,
9767 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9768 Object_Definition => New_Copy_Tree (Def),
9769 Expression => Actual);
9771 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9773 -- A generic formal object of a tagged type is defined to be
9774 -- aliased so the new constant must also be treated as aliased.
9776 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
9777 Set_Aliased_Present (Decl_Node);
9780 Append (Decl_Node, List);
9782 -- No need to repeat (pre-)analysis of some expression nodes
9783 -- already handled in Preanalyze_Actuals.
9785 if Nkind (Actual) /= N_Allocator then
9788 -- Return if the analysis of the actual reported some error
9790 if Etype (Actual) = Any_Type then
9796 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
9800 Typ := Get_Instance_Of (Formal_Type);
9802 Freeze_Before (Instantiation_Node, Typ);
9804 -- If the actual is an aggregate, perform name resolution on
9805 -- its components (the analysis of an aggregate does not do it)
9806 -- to capture local names that may be hidden if the generic is
9809 if Nkind (Actual) = N_Aggregate then
9810 Preanalyze_And_Resolve (Actual, Typ);
9813 if Is_Limited_Type (Typ)
9814 and then not OK_For_Limited_Init (Typ, Actual)
9817 ("initialization not allowed for limited types", Actual);
9818 Explain_Limited_Type (Typ, Actual);
9822 elsif Present (Default_Expression (Formal)) then
9824 -- Use default to construct declaration
9826 if Present (Subt_Mark) then
9828 else pragma Assert (Present (Acc_Def));
9833 Make_Object_Declaration (Sloc (Formal),
9834 Defining_Identifier => New_Copy (Gen_Obj),
9835 Constant_Present => True,
9836 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9837 Object_Definition => New_Copy (Def),
9838 Expression => New_Copy_Tree
9839 (Default_Expression (Formal)));
9841 Append (Decl_Node, List);
9842 Set_Analyzed (Expression (Decl_Node), False);
9847 Instantiation_Node, Gen_Obj);
9848 Error_Msg_NE ("\in instantiation of & declared#",
9849 Instantiation_Node, Scope (A_Gen_Obj));
9851 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
9853 -- Create dummy constant declaration so that instance can be
9854 -- analyzed, to minimize cascaded visibility errors.
9856 if Present (Subt_Mark) then
9858 else pragma Assert (Present (Acc_Def));
9863 Make_Object_Declaration (Loc,
9864 Defining_Identifier => New_Copy (Gen_Obj),
9865 Constant_Present => True,
9866 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9867 Object_Definition => New_Copy (Def),
9869 Make_Attribute_Reference (Sloc (Gen_Obj),
9870 Attribute_Name => Name_First,
9871 Prefix => New_Copy (Def)));
9873 Append (Decl_Node, List);
9876 Abandon_Instantiation (Instantiation_Node);
9881 if Nkind (Actual) in N_Has_Entity then
9882 Actual_Decl := Parent (Entity (Actual));
9885 -- Ada 2005 (AI-423): For a formal object declaration with a null
9886 -- exclusion or an access definition that has a null exclusion: If the
9887 -- actual matching the formal object declaration denotes a generic
9888 -- formal object of another generic unit G, and the instantiation
9889 -- containing the actual occurs within the body of G or within the body
9890 -- of a generic unit declared within the declarative region of G, then
9891 -- the declaration of the formal object of G must have a null exclusion.
9892 -- Otherwise, the subtype of the actual matching the formal object
9893 -- declaration shall exclude null.
9895 if Ada_Version >= Ada_2005
9896 and then Present (Actual_Decl)
9898 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9899 N_Object_Declaration)
9900 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9901 and then not Has_Null_Exclusion (Actual_Decl)
9902 and then Has_Null_Exclusion (Analyzed_Formal)
9904 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9906 ("actual must exclude null to match generic formal#", Actual);
9909 -- A volatile object cannot be used as an actual in a generic instance.
9910 -- The following check is only relevant when SPARK_Mode is on as it is
9911 -- not a standard Ada legality rule.
9914 and then Present (Actual)
9915 and then Is_SPARK_Volatile_Object (Actual)
9918 ("volatile object cannot act as actual in generic instantiation "
9919 & "(SPARK RM 7.1.3(8))", Actual);
9923 end Instantiate_Object;
9925 ------------------------------
9926 -- Instantiate_Package_Body --
9927 ------------------------------
9929 procedure Instantiate_Package_Body
9930 (Body_Info : Pending_Body_Info;
9931 Inlined_Body : Boolean := False;
9932 Body_Optional : Boolean := False)
9934 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9935 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9936 Loc : constant Source_Ptr := Sloc (Inst_Node);
9938 Gen_Id : constant Node_Id := Name (Inst_Node);
9939 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9940 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9941 Act_Spec : constant Node_Id := Specification (Act_Decl);
9942 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9944 Act_Body_Name : Node_Id;
9946 Gen_Body_Id : Node_Id;
9948 Act_Body_Id : Entity_Id;
9950 Parent_Installed : Boolean := False;
9951 Save_Style_Check : constant Boolean := Style_Check;
9953 Par_Ent : Entity_Id := Empty;
9954 Par_Vis : Boolean := False;
9956 Vis_Prims_List : Elist_Id := No_Elist;
9957 -- List of primitives made temporarily visible in the instantiation
9958 -- to match the visibility of the formal type
9960 procedure Check_Initialized_Types;
9961 -- In a generic package body, an entity of a generic private type may
9962 -- appear uninitialized. This is suspicious, unless the actual is a
9963 -- fully initialized type.
9965 -----------------------------
9966 -- Check_Initialized_Types --
9967 -----------------------------
9969 procedure Check_Initialized_Types is
9973 Uninit_Var : Entity_Id;
9976 Decl := First (Generic_Formal_Declarations (Gen_Decl));
9977 while Present (Decl) loop
9978 Uninit_Var := Empty;
9980 if Nkind (Decl) = N_Private_Extension_Declaration then
9981 Uninit_Var := Uninitialized_Variable (Decl);
9983 elsif Nkind (Decl) = N_Formal_Type_Declaration
9984 and then Nkind (Formal_Type_Definition (Decl)) =
9985 N_Formal_Private_Type_Definition
9988 Uninitialized_Variable (Formal_Type_Definition (Decl));
9991 if Present (Uninit_Var) then
9992 Formal := Defining_Identifier (Decl);
9993 Actual := First_Entity (Act_Decl_Id);
9995 -- For each formal there is a subtype declaration that renames
9996 -- the actual and has the same name as the formal. Locate the
9997 -- formal for warning message about uninitialized variables
9998 -- in the generic, for which the actual type should be a fully
9999 -- initialized type.
10001 while Present (Actual) loop
10002 exit when Ekind (Actual) = E_Package
10003 and then Present (Renamed_Object (Actual));
10005 if Chars (Actual) = Chars (Formal)
10006 and then not Is_Scalar_Type (Actual)
10007 and then not Is_Fully_Initialized_Type (Actual)
10008 and then Warn_On_No_Value_Assigned
10010 Error_Msg_Node_2 := Formal;
10012 ("generic unit has uninitialized variable& of "
10013 & "formal private type &?v?", Actual, Uninit_Var);
10015 ("actual type for& should be fully initialized type?v?",
10020 Next_Entity (Actual);
10026 end Check_Initialized_Types;
10028 -- Start of processing for Instantiate_Package_Body
10031 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10033 -- The instance body may already have been processed, as the parent of
10034 -- another instance that is inlined (Load_Parent_Of_Generic).
10036 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
10040 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
10042 -- Re-establish the state of information on which checks are suppressed.
10043 -- This information was set in Body_Info at the point of instantiation,
10044 -- and now we restore it so that the instance is compiled using the
10045 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10047 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
10048 Scope_Suppress := Body_Info.Scope_Suppress;
10049 Opt.Ada_Version := Body_Info.Version;
10050 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma;
10051 Restore_Warnings (Body_Info.Warnings);
10052 Opt.SPARK_Mode := Body_Info.SPARK_Mode;
10053 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma;
10055 if No (Gen_Body_Id) then
10057 -- Do not look for parent of generic body if none is required.
10058 -- This may happen when the routine is called as part of the
10059 -- Pending_Instantiations processing, when nested instances
10060 -- may precede the one generated from the main unit.
10062 if not Unit_Requires_Body (Defining_Entity (Gen_Decl))
10063 and then Body_Optional
10067 Load_Parent_Of_Generic
10068 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10069 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10073 -- Establish global variable for sloc adjustment and for error recovery
10075 Instantiation_Node := Inst_Node;
10077 if Present (Gen_Body_Id) then
10078 Save_Env (Gen_Unit, Act_Decl_Id);
10079 Style_Check := False;
10080 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10082 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10084 Create_Instantiation_Source
10085 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
10089 (Original_Node (Gen_Body), Empty, Instantiating => True);
10091 -- Build new name (possibly qualified) for body declaration
10093 Act_Body_Id := New_Copy (Act_Decl_Id);
10095 -- Some attributes of spec entity are not inherited by body entity
10097 Set_Handler_Records (Act_Body_Id, No_List);
10099 if Nkind (Defining_Unit_Name (Act_Spec)) =
10100 N_Defining_Program_Unit_Name
10103 Make_Defining_Program_Unit_Name (Loc,
10104 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
10105 Defining_Identifier => Act_Body_Id);
10107 Act_Body_Name := Act_Body_Id;
10110 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
10112 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
10113 Check_Generic_Actuals (Act_Decl_Id, False);
10114 Check_Initialized_Types;
10116 -- Install primitives hidden at the point of the instantiation but
10117 -- visible when processing the generic formals
10123 E := First_Entity (Act_Decl_Id);
10124 while Present (E) loop
10126 and then Is_Generic_Actual_Type (E)
10127 and then Is_Tagged_Type (E)
10129 Install_Hidden_Primitives
10130 (Prims_List => Vis_Prims_List,
10131 Gen_T => Generic_Parent_Type (Parent (E)),
10139 -- If it is a child unit, make the parent instance (which is an
10140 -- instance of the parent of the generic) visible. The parent
10141 -- instance is the prefix of the name of the generic unit.
10143 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10144 and then Nkind (Gen_Id) = N_Expanded_Name
10146 Par_Ent := Entity (Prefix (Gen_Id));
10147 Par_Vis := Is_Immediately_Visible (Par_Ent);
10148 Install_Parent (Par_Ent, In_Body => True);
10149 Parent_Installed := True;
10151 elsif Is_Child_Unit (Gen_Unit) then
10152 Par_Ent := Scope (Gen_Unit);
10153 Par_Vis := Is_Immediately_Visible (Par_Ent);
10154 Install_Parent (Par_Ent, In_Body => True);
10155 Parent_Installed := True;
10158 -- If the instantiation is a library unit, and this is the main unit,
10159 -- then build the resulting compilation unit nodes for the instance.
10160 -- If this is a compilation unit but it is not the main unit, then it
10161 -- is the body of a unit in the context, that is being compiled
10162 -- because it is encloses some inlined unit or another generic unit
10163 -- being instantiated. In that case, this body is not part of the
10164 -- current compilation, and is not attached to the tree, but its
10165 -- parent must be set for analysis.
10167 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10169 -- Replace instance node with body of instance, and create new
10170 -- node for corresponding instance declaration.
10172 Build_Instance_Compilation_Unit_Nodes
10173 (Inst_Node, Act_Body, Act_Decl);
10174 Analyze (Inst_Node);
10176 if Parent (Inst_Node) = Cunit (Main_Unit) then
10178 -- If the instance is a child unit itself, then set the scope
10179 -- of the expanded body to be the parent of the instantiation
10180 -- (ensuring that the fully qualified name will be generated
10181 -- for the elaboration subprogram).
10183 if Nkind (Defining_Unit_Name (Act_Spec)) =
10184 N_Defining_Program_Unit_Name
10187 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
10191 -- Case where instantiation is not a library unit
10194 -- If this is an early instantiation, i.e. appears textually
10195 -- before the corresponding body and must be elaborated first,
10196 -- indicate that the body instance is to be delayed.
10198 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
10200 -- Now analyze the body. We turn off all checks if this is an
10201 -- internal unit, since there is no reason to have checks on for
10202 -- any predefined run-time library code. All such code is designed
10203 -- to be compiled with checks off.
10205 -- Note that we do NOT apply this criterion to children of GNAT
10206 -- (or on VMS, children of DEC). The latter units must suppress
10207 -- checks explicitly if this is needed.
10209 if Is_Predefined_File_Name
10210 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
10212 Analyze (Act_Body, Suppress => All_Checks);
10214 Analyze (Act_Body);
10218 Inherit_Context (Gen_Body, Inst_Node);
10220 -- Remove the parent instances if they have been placed on the scope
10221 -- stack to compile the body.
10223 if Parent_Installed then
10224 Remove_Parent (In_Body => True);
10226 -- Restore the previous visibility of the parent
10228 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
10231 Restore_Hidden_Primitives (Vis_Prims_List);
10232 Restore_Private_Views (Act_Decl_Id);
10234 -- Remove the current unit from visibility if this is an instance
10235 -- that is not elaborated on the fly for inlining purposes.
10237 if not Inlined_Body then
10238 Set_Is_Immediately_Visible (Act_Decl_Id, False);
10242 Style_Check := Save_Style_Check;
10244 -- If we have no body, and the unit requires a body, then complain. This
10245 -- complaint is suppressed if we have detected other errors (since a
10246 -- common reason for missing the body is that it had errors).
10247 -- In CodePeer mode, a warning has been emitted already, no need for
10248 -- further messages.
10250 elsif Unit_Requires_Body (Gen_Unit)
10251 and then not Body_Optional
10253 if CodePeer_Mode then
10256 elsif Serious_Errors_Detected = 0 then
10258 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
10260 -- Don't attempt to perform any cleanup actions if some other error
10261 -- was already detected, since this can cause blowups.
10267 -- Case of package that does not need a body
10270 -- If the instantiation of the declaration is a library unit, rewrite
10271 -- the original package instantiation as a package declaration in the
10272 -- compilation unit node.
10274 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10275 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
10276 Rewrite (Inst_Node, Act_Decl);
10278 -- Generate elaboration entity, in case spec has elaboration code.
10279 -- This cannot be done when the instance is analyzed, because it
10280 -- is not known yet whether the body exists.
10282 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
10283 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
10285 -- If the instantiation is not a library unit, then append the
10286 -- declaration to the list of implicitly generated entities, unless
10287 -- it is already a list member which means that it was already
10290 elsif not Is_List_Member (Act_Decl) then
10291 Mark_Rewrite_Insertion (Act_Decl);
10292 Insert_Before (Inst_Node, Act_Decl);
10296 Expander_Mode_Restore;
10297 end Instantiate_Package_Body;
10299 ---------------------------------
10300 -- Instantiate_Subprogram_Body --
10301 ---------------------------------
10303 procedure Instantiate_Subprogram_Body
10304 (Body_Info : Pending_Body_Info;
10305 Body_Optional : Boolean := False)
10307 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
10308 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
10309 Loc : constant Source_Ptr := Sloc (Inst_Node);
10310 Gen_Id : constant Node_Id := Name (Inst_Node);
10311 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
10312 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
10313 Anon_Id : constant Entity_Id :=
10314 Defining_Unit_Name (Specification (Act_Decl));
10315 Pack_Id : constant Entity_Id :=
10316 Defining_Unit_Name (Parent (Act_Decl));
10318 Gen_Body : Node_Id;
10319 Gen_Body_Id : Node_Id;
10320 Act_Body : Node_Id;
10321 Pack_Body : Node_Id;
10322 Prev_Formal : Entity_Id;
10323 Ret_Expr : Node_Id;
10324 Unit_Renaming : Node_Id;
10326 Parent_Installed : Boolean := False;
10328 Saved_Style_Check : constant Boolean := Style_Check;
10329 Saved_Warnings : constant Warning_Record := Save_Warnings;
10331 Par_Ent : Entity_Id := Empty;
10332 Par_Vis : Boolean := False;
10335 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10337 -- Subprogram body may have been created already because of an inline
10338 -- pragma, or because of multiple elaborations of the enclosing package
10339 -- when several instances of the subprogram appear in the main unit.
10341 if Present (Corresponding_Body (Act_Decl)) then
10345 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
10347 -- Re-establish the state of information on which checks are suppressed.
10348 -- This information was set in Body_Info at the point of instantiation,
10349 -- and now we restore it so that the instance is compiled using the
10350 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
10352 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
10353 Scope_Suppress := Body_Info.Scope_Suppress;
10354 Opt.Ada_Version := Body_Info.Version;
10355 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma;
10356 Restore_Warnings (Body_Info.Warnings);
10357 Opt.SPARK_Mode := Body_Info.SPARK_Mode;
10358 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma;
10360 if No (Gen_Body_Id) then
10362 -- For imported generic subprogram, no body to compile, complete
10363 -- the spec entity appropriately.
10365 if Is_Imported (Gen_Unit) then
10366 Set_Is_Imported (Anon_Id);
10367 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
10368 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
10369 Set_Convention (Anon_Id, Convention (Gen_Unit));
10370 Set_Has_Completion (Anon_Id);
10373 -- For other cases, compile the body
10376 Load_Parent_Of_Generic
10377 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10378 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10382 Instantiation_Node := Inst_Node;
10384 if Present (Gen_Body_Id) then
10385 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10387 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
10389 -- Either body is not present, or context is non-expanding, as
10390 -- when compiling a subunit. Mark the instance as completed, and
10391 -- diagnose a missing body when needed.
10394 and then Operating_Mode = Generate_Code
10397 ("missing proper body for instantiation", Gen_Body);
10400 Set_Has_Completion (Anon_Id);
10404 Save_Env (Gen_Unit, Anon_Id);
10405 Style_Check := False;
10406 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10407 Create_Instantiation_Source
10415 (Original_Node (Gen_Body), Empty, Instantiating => True);
10417 -- Create proper defining name for the body, to correspond to
10418 -- the one in the spec.
10420 Set_Defining_Unit_Name (Specification (Act_Body),
10421 Make_Defining_Identifier
10422 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
10423 Set_Corresponding_Spec (Act_Body, Anon_Id);
10424 Set_Has_Completion (Anon_Id);
10425 Check_Generic_Actuals (Pack_Id, False);
10427 -- Generate a reference to link the visible subprogram instance to
10428 -- the generic body, which for navigation purposes is the only
10429 -- available source for the instance.
10432 (Related_Instance (Pack_Id),
10433 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
10435 -- If it is a child unit, make the parent instance (which is an
10436 -- instance of the parent of the generic) visible. The parent
10437 -- instance is the prefix of the name of the generic unit.
10439 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10440 and then Nkind (Gen_Id) = N_Expanded_Name
10442 Par_Ent := Entity (Prefix (Gen_Id));
10443 Par_Vis := Is_Immediately_Visible (Par_Ent);
10444 Install_Parent (Par_Ent, In_Body => True);
10445 Parent_Installed := True;
10447 elsif Is_Child_Unit (Gen_Unit) then
10448 Par_Ent := Scope (Gen_Unit);
10449 Par_Vis := Is_Immediately_Visible (Par_Ent);
10450 Install_Parent (Par_Ent, In_Body => True);
10451 Parent_Installed := True;
10454 -- Inside its body, a reference to the generic unit is a reference
10455 -- to the instance. The corresponding renaming is the first
10456 -- declaration in the body.
10459 Make_Subprogram_Renaming_Declaration (Loc,
10461 Copy_Generic_Node (
10462 Specification (Original_Node (Gen_Body)),
10464 Instantiating => True),
10465 Name => New_Occurrence_Of (Anon_Id, Loc));
10467 -- If there is a formal subprogram with the same name as the unit
10468 -- itself, do not add this renaming declaration. This is a temporary
10469 -- fix for one ACVC test. ???
10471 Prev_Formal := First_Entity (Pack_Id);
10472 while Present (Prev_Formal) loop
10473 if Chars (Prev_Formal) = Chars (Gen_Unit)
10474 and then Is_Overloadable (Prev_Formal)
10479 Next_Entity (Prev_Formal);
10482 if Present (Prev_Formal) then
10483 Decls := New_List (Act_Body);
10485 Decls := New_List (Unit_Renaming, Act_Body);
10488 -- The subprogram body is placed in the body of a dummy package body,
10489 -- whose spec contains the subprogram declaration as well as the
10490 -- renaming declarations for the generic parameters.
10492 Pack_Body := Make_Package_Body (Loc,
10493 Defining_Unit_Name => New_Copy (Pack_Id),
10494 Declarations => Decls);
10496 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10498 -- If the instantiation is a library unit, then build resulting
10499 -- compilation unit nodes for the instance. The declaration of
10500 -- the enclosing package is the grandparent of the subprogram
10501 -- declaration. First replace the instantiation node as the unit
10502 -- of the corresponding compilation.
10504 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10505 if Parent (Inst_Node) = Cunit (Main_Unit) then
10506 Set_Unit (Parent (Inst_Node), Inst_Node);
10507 Build_Instance_Compilation_Unit_Nodes
10508 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
10509 Analyze (Inst_Node);
10511 Set_Parent (Pack_Body, Parent (Inst_Node));
10512 Analyze (Pack_Body);
10516 Insert_Before (Inst_Node, Pack_Body);
10517 Mark_Rewrite_Insertion (Pack_Body);
10518 Analyze (Pack_Body);
10520 if Expander_Active then
10521 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
10525 Inherit_Context (Gen_Body, Inst_Node);
10527 Restore_Private_Views (Pack_Id, False);
10529 if Parent_Installed then
10530 Remove_Parent (In_Body => True);
10532 -- Restore the previous visibility of the parent
10534 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
10538 Style_Check := Saved_Style_Check;
10539 Restore_Warnings (Saved_Warnings);
10541 -- Body not found. Error was emitted already. If there were no previous
10542 -- errors, this may be an instance whose scope is a premature instance.
10543 -- In that case we must insure that the (legal) program does raise
10544 -- program error if executed. We generate a subprogram body for this
10545 -- purpose. See DEC ac30vso.
10547 -- Should not reference proprietary DEC tests in comments ???
10549 elsif Serious_Errors_Detected = 0
10550 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
10552 if Body_Optional then
10555 elsif Ekind (Anon_Id) = E_Procedure then
10557 Make_Subprogram_Body (Loc,
10559 Make_Procedure_Specification (Loc,
10560 Defining_Unit_Name =>
10561 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10562 Parameter_Specifications =>
10564 (Parameter_Specifications (Parent (Anon_Id)))),
10566 Declarations => Empty_List,
10567 Handled_Statement_Sequence =>
10568 Make_Handled_Sequence_Of_Statements (Loc,
10571 Make_Raise_Program_Error (Loc,
10573 PE_Access_Before_Elaboration))));
10577 Make_Raise_Program_Error (Loc,
10578 Reason => PE_Access_Before_Elaboration);
10580 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
10581 Set_Analyzed (Ret_Expr);
10584 Make_Subprogram_Body (Loc,
10586 Make_Function_Specification (Loc,
10587 Defining_Unit_Name =>
10588 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10589 Parameter_Specifications =>
10591 (Parameter_Specifications (Parent (Anon_Id))),
10592 Result_Definition =>
10593 New_Occurrence_Of (Etype (Anon_Id), Loc)),
10595 Declarations => Empty_List,
10596 Handled_Statement_Sequence =>
10597 Make_Handled_Sequence_Of_Statements (Loc,
10600 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
10603 Pack_Body := Make_Package_Body (Loc,
10604 Defining_Unit_Name => New_Copy (Pack_Id),
10605 Declarations => New_List (Act_Body));
10607 Insert_After (Inst_Node, Pack_Body);
10608 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10609 Analyze (Pack_Body);
10612 Expander_Mode_Restore;
10613 end Instantiate_Subprogram_Body;
10615 ----------------------
10616 -- Instantiate_Type --
10617 ----------------------
10619 function Instantiate_Type
10622 Analyzed_Formal : Node_Id;
10623 Actual_Decls : List_Id) return List_Id
10625 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
10626 A_Gen_T : constant Entity_Id :=
10627 Defining_Identifier (Analyzed_Formal);
10628 Ancestor : Entity_Id := Empty;
10629 Def : constant Node_Id := Formal_Type_Definition (Formal);
10631 Decl_Node : Node_Id;
10632 Decl_Nodes : List_Id;
10636 procedure Validate_Array_Type_Instance;
10637 procedure Validate_Access_Subprogram_Instance;
10638 procedure Validate_Access_Type_Instance;
10639 procedure Validate_Derived_Type_Instance;
10640 procedure Validate_Derived_Interface_Type_Instance;
10641 procedure Validate_Discriminated_Formal_Type;
10642 procedure Validate_Interface_Type_Instance;
10643 procedure Validate_Private_Type_Instance;
10644 procedure Validate_Incomplete_Type_Instance;
10645 -- These procedures perform validation tests for the named case.
10646 -- Validate_Discriminated_Formal_Type is shared by formal private
10647 -- types and Ada 2012 formal incomplete types.
10649 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
10650 -- Check that base types are the same and that the subtypes match
10651 -- statically. Used in several of the above.
10653 --------------------
10654 -- Subtypes_Match --
10655 --------------------
10657 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
10658 T : constant Entity_Id := Get_Instance_Of (Gen_T);
10661 -- Some detailed comments would be useful here ???
10663 return ((Base_Type (T) = Act_T
10664 or else Base_Type (T) = Base_Type (Act_T))
10665 and then Subtypes_Statically_Match (T, Act_T))
10667 or else (Is_Class_Wide_Type (Gen_T)
10668 and then Is_Class_Wide_Type (Act_T)
10669 and then Subtypes_Match
10670 (Get_Instance_Of (Root_Type (Gen_T)),
10671 Root_Type (Act_T)))
10674 (Ekind_In (Gen_T, E_Anonymous_Access_Subprogram_Type,
10675 E_Anonymous_Access_Type)
10676 and then Ekind (Act_T) = Ekind (Gen_T)
10677 and then Subtypes_Statically_Match
10678 (Designated_Type (Gen_T), Designated_Type (Act_T)));
10679 end Subtypes_Match;
10681 -----------------------------------------
10682 -- Validate_Access_Subprogram_Instance --
10683 -----------------------------------------
10685 procedure Validate_Access_Subprogram_Instance is
10687 if not Is_Access_Type (Act_T)
10688 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
10691 ("expect access type in instantiation of &", Actual, Gen_T);
10692 Abandon_Instantiation (Actual);
10695 -- According to AI05-288, actuals for access_to_subprograms must be
10696 -- subtype conformant with the generic formal. Previous to AI05-288
10697 -- only mode conformance was required.
10699 -- This is a binding interpretation that applies to previous versions
10700 -- of the language, no need to maintain previous weaker checks.
10702 Check_Subtype_Conformant
10703 (Designated_Type (Act_T),
10704 Designated_Type (A_Gen_T),
10708 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
10709 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
10711 ("protected access type not allowed for formal &",
10715 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
10717 ("expect protected access type for formal &",
10720 end Validate_Access_Subprogram_Instance;
10722 -----------------------------------
10723 -- Validate_Access_Type_Instance --
10724 -----------------------------------
10726 procedure Validate_Access_Type_Instance is
10727 Desig_Type : constant Entity_Id :=
10728 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
10729 Desig_Act : Entity_Id;
10732 if not Is_Access_Type (Act_T) then
10734 ("expect access type in instantiation of &", Actual, Gen_T);
10735 Abandon_Instantiation (Actual);
10738 if Is_Access_Constant (A_Gen_T) then
10739 if not Is_Access_Constant (Act_T) then
10741 ("actual type must be access-to-constant type", Actual);
10742 Abandon_Instantiation (Actual);
10745 if Is_Access_Constant (Act_T) then
10747 ("actual type must be access-to-variable type", Actual);
10748 Abandon_Instantiation (Actual);
10750 elsif Ekind (A_Gen_T) = E_General_Access_Type
10751 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
10753 Error_Msg_N -- CODEFIX
10754 ("actual must be general access type!", Actual);
10755 Error_Msg_NE -- CODEFIX
10756 ("add ALL to }!", Actual, Act_T);
10757 Abandon_Instantiation (Actual);
10761 -- The designated subtypes, that is to say the subtypes introduced
10762 -- by an access type declaration (and not by a subtype declaration)
10765 Desig_Act := Designated_Type (Base_Type (Act_T));
10767 -- The designated type may have been introduced through a limited_
10768 -- with clause, in which case retrieve the non-limited view. This
10769 -- applies to incomplete types as well as to class-wide types.
10771 if From_Limited_With (Desig_Act) then
10772 Desig_Act := Available_View (Desig_Act);
10775 if not Subtypes_Match (Desig_Type, Desig_Act) then
10777 ("designated type of actual does not match that of formal &",
10780 if not Predicates_Match (Desig_Type, Desig_Act) then
10781 Error_Msg_N ("\predicates do not match", Actual);
10784 Abandon_Instantiation (Actual);
10786 elsif Is_Access_Type (Designated_Type (Act_T))
10787 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
10789 Is_Constrained (Designated_Type (Desig_Type))
10792 ("designated type of actual does not match that of formal &",
10795 if not Predicates_Match (Desig_Type, Desig_Act) then
10796 Error_Msg_N ("\predicates do not match", Actual);
10799 Abandon_Instantiation (Actual);
10802 -- Ada 2005: null-exclusion indicators of the two types must agree
10804 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
10806 ("non null exclusion of actual and formal & do not match",
10809 end Validate_Access_Type_Instance;
10811 ----------------------------------
10812 -- Validate_Array_Type_Instance --
10813 ----------------------------------
10815 procedure Validate_Array_Type_Instance is
10820 function Formal_Dimensions return Int;
10821 -- Count number of dimensions in array type formal
10823 -----------------------
10824 -- Formal_Dimensions --
10825 -----------------------
10827 function Formal_Dimensions return Int is
10832 if Nkind (Def) = N_Constrained_Array_Definition then
10833 Index := First (Discrete_Subtype_Definitions (Def));
10835 Index := First (Subtype_Marks (Def));
10838 while Present (Index) loop
10840 Next_Index (Index);
10844 end Formal_Dimensions;
10846 -- Start of processing for Validate_Array_Type_Instance
10849 if not Is_Array_Type (Act_T) then
10851 ("expect array type in instantiation of &", Actual, Gen_T);
10852 Abandon_Instantiation (Actual);
10854 elsif Nkind (Def) = N_Constrained_Array_Definition then
10855 if not (Is_Constrained (Act_T)) then
10857 ("expect constrained array in instantiation of &",
10859 Abandon_Instantiation (Actual);
10863 if Is_Constrained (Act_T) then
10865 ("expect unconstrained array in instantiation of &",
10867 Abandon_Instantiation (Actual);
10871 if Formal_Dimensions /= Number_Dimensions (Act_T) then
10873 ("dimensions of actual do not match formal &", Actual, Gen_T);
10874 Abandon_Instantiation (Actual);
10877 I1 := First_Index (A_Gen_T);
10878 I2 := First_Index (Act_T);
10879 for J in 1 .. Formal_Dimensions loop
10881 -- If the indexes of the actual were given by a subtype_mark,
10882 -- the index was transformed into a range attribute. Retrieve
10883 -- the original type mark for checking.
10885 if Is_Entity_Name (Original_Node (I2)) then
10886 T2 := Entity (Original_Node (I2));
10891 if not Subtypes_Match
10892 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
10895 ("index types of actual do not match those of formal &",
10897 Abandon_Instantiation (Actual);
10904 -- Check matching subtypes. Note that there are complex visibility
10905 -- issues when the generic is a child unit and some aspect of the
10906 -- generic type is declared in a parent unit of the generic. We do
10907 -- the test to handle this special case only after a direct check
10908 -- for static matching has failed. The case where both the component
10909 -- type and the array type are separate formals, and the component
10910 -- type is a private view may also require special checking in
10914 (Component_Type (A_Gen_T), Component_Type (Act_T))
10915 or else Subtypes_Match
10916 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
10917 Component_Type (Act_T))
10922 ("component subtype of actual does not match that of formal &",
10924 Abandon_Instantiation (Actual);
10927 if Has_Aliased_Components (A_Gen_T)
10928 and then not Has_Aliased_Components (Act_T)
10931 ("actual must have aliased components to match formal type &",
10934 end Validate_Array_Type_Instance;
10936 -----------------------------------------------
10937 -- Validate_Derived_Interface_Type_Instance --
10938 -----------------------------------------------
10940 procedure Validate_Derived_Interface_Type_Instance is
10941 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
10945 -- First apply interface instance checks
10947 Validate_Interface_Type_Instance;
10949 -- Verify that immediate parent interface is an ancestor of
10953 and then not Interface_Present_In_Ancestor (Act_T, Par)
10956 ("interface actual must include progenitor&", Actual, Par);
10959 -- Now verify that the actual includes all other ancestors of
10962 Elmt := First_Elmt (Interfaces (A_Gen_T));
10963 while Present (Elmt) loop
10964 if not Interface_Present_In_Ancestor
10965 (Act_T, Get_Instance_Of (Node (Elmt)))
10968 ("interface actual must include progenitor&",
10969 Actual, Node (Elmt));
10974 end Validate_Derived_Interface_Type_Instance;
10976 ------------------------------------
10977 -- Validate_Derived_Type_Instance --
10978 ------------------------------------
10980 procedure Validate_Derived_Type_Instance is
10981 Actual_Discr : Entity_Id;
10982 Ancestor_Discr : Entity_Id;
10985 -- If the parent type in the generic declaration is itself a previous
10986 -- formal type, then it is local to the generic and absent from the
10987 -- analyzed generic definition. In that case the ancestor is the
10988 -- instance of the formal (which must have been instantiated
10989 -- previously), unless the ancestor is itself a formal derived type.
10990 -- In this latter case (which is the subject of Corrigendum 8652/0038
10991 -- (AI-202) the ancestor of the formals is the ancestor of its
10992 -- parent. Otherwise, the analyzed generic carries the parent type.
10993 -- If the parent type is defined in a previous formal package, then
10994 -- the scope of that formal package is that of the generic type
10995 -- itself, and it has already been mapped into the corresponding type
10996 -- in the actual package.
10998 -- Common case: parent type defined outside of the generic
11000 if Is_Entity_Name (Subtype_Mark (Def))
11001 and then Present (Entity (Subtype_Mark (Def)))
11003 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
11005 -- Check whether parent is defined in a previous formal package
11008 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
11011 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
11013 -- The type may be a local derivation, or a type extension of a
11014 -- previous formal, or of a formal of a parent package.
11016 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
11018 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
11020 -- Check whether the parent is another derived formal type in the
11021 -- same generic unit.
11023 if Etype (A_Gen_T) /= A_Gen_T
11024 and then Is_Generic_Type (Etype (A_Gen_T))
11025 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
11026 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
11028 -- Locate ancestor of parent from the subtype declaration
11029 -- created for the actual.
11035 Decl := First (Actual_Decls);
11036 while Present (Decl) loop
11037 if Nkind (Decl) = N_Subtype_Declaration
11038 and then Chars (Defining_Identifier (Decl)) =
11039 Chars (Etype (A_Gen_T))
11041 Ancestor := Generic_Parent_Type (Decl);
11049 pragma Assert (Present (Ancestor));
11051 -- The ancestor itself may be a previous formal that has been
11054 Ancestor := Get_Instance_Of (Ancestor);
11058 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
11061 -- An unusual case: the actual is a type declared in a parent unit,
11062 -- but is not a formal type so there is no instance_of for it.
11063 -- Retrieve it by analyzing the record extension.
11065 elsif Is_Child_Unit (Scope (A_Gen_T))
11066 and then In_Open_Scopes (Scope (Act_T))
11067 and then Is_Generic_Instance (Scope (Act_T))
11069 Analyze (Subtype_Mark (Def));
11070 Ancestor := Entity (Subtype_Mark (Def));
11073 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
11076 -- If the formal derived type has pragma Preelaborable_Initialization
11077 -- then the actual type must have preelaborable initialization.
11079 if Known_To_Have_Preelab_Init (A_Gen_T)
11080 and then not Has_Preelaborable_Initialization (Act_T)
11083 ("actual for & must have preelaborable initialization",
11087 -- Ada 2005 (AI-251)
11089 if Ada_Version >= Ada_2005 and then Is_Interface (Ancestor) then
11090 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
11092 ("(Ada 2005) expected type implementing & in instantiation",
11096 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
11098 ("expect type derived from & in instantiation",
11099 Actual, First_Subtype (Ancestor));
11100 Abandon_Instantiation (Actual);
11103 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
11104 -- that the formal type declaration has been rewritten as a private
11107 if Ada_Version >= Ada_2005
11108 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
11109 and then Synchronized_Present (Parent (A_Gen_T))
11111 -- The actual must be a synchronized tagged type
11113 if not Is_Tagged_Type (Act_T) then
11115 ("actual of synchronized type must be tagged", Actual);
11116 Abandon_Instantiation (Actual);
11118 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
11119 and then Nkind (Type_Definition (Parent (Act_T))) =
11120 N_Derived_Type_Definition
11121 and then not Synchronized_Present (Type_Definition
11125 ("actual of synchronized type must be synchronized", Actual);
11126 Abandon_Instantiation (Actual);
11130 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
11131 -- removes the second instance of the phrase "or allow pass by copy".
11133 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
11135 ("cannot have atomic actual type for non-atomic formal type",
11138 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
11140 ("cannot have volatile actual type for non-volatile formal type",
11144 -- It should not be necessary to check for unknown discriminants on
11145 -- Formal, but for some reason Has_Unknown_Discriminants is false for
11146 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
11147 -- needs fixing. ???
11149 if not Is_Indefinite_Subtype (A_Gen_T)
11150 and then not Unknown_Discriminants_Present (Formal)
11151 and then Is_Indefinite_Subtype (Act_T)
11154 ("actual subtype must be constrained", Actual);
11155 Abandon_Instantiation (Actual);
11158 if not Unknown_Discriminants_Present (Formal) then
11159 if Is_Constrained (Ancestor) then
11160 if not Is_Constrained (Act_T) then
11162 ("actual subtype must be constrained", Actual);
11163 Abandon_Instantiation (Actual);
11166 -- Ancestor is unconstrained, Check if generic formal and actual
11167 -- agree on constrainedness. The check only applies to array types
11168 -- and discriminated types.
11170 elsif Is_Constrained (Act_T) then
11171 if Ekind (Ancestor) = E_Access_Type
11173 (not Is_Constrained (A_Gen_T)
11174 and then Is_Composite_Type (A_Gen_T))
11177 ("actual subtype must be unconstrained", Actual);
11178 Abandon_Instantiation (Actual);
11181 -- A class-wide type is only allowed if the formal has unknown
11184 elsif Is_Class_Wide_Type (Act_T)
11185 and then not Has_Unknown_Discriminants (Ancestor)
11188 ("actual for & cannot be a class-wide type", Actual, Gen_T);
11189 Abandon_Instantiation (Actual);
11191 -- Otherwise, the formal and actual shall have the same number
11192 -- of discriminants and each discriminant of the actual must
11193 -- correspond to a discriminant of the formal.
11195 elsif Has_Discriminants (Act_T)
11196 and then not Has_Unknown_Discriminants (Act_T)
11197 and then Has_Discriminants (Ancestor)
11199 Actual_Discr := First_Discriminant (Act_T);
11200 Ancestor_Discr := First_Discriminant (Ancestor);
11201 while Present (Actual_Discr)
11202 and then Present (Ancestor_Discr)
11204 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
11205 No (Corresponding_Discriminant (Actual_Discr))
11208 ("discriminant & does not correspond " &
11209 "to ancestor discriminant", Actual, Actual_Discr);
11210 Abandon_Instantiation (Actual);
11213 Next_Discriminant (Actual_Discr);
11214 Next_Discriminant (Ancestor_Discr);
11217 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
11219 ("actual for & must have same number of discriminants",
11221 Abandon_Instantiation (Actual);
11224 -- This case should be caught by the earlier check for
11225 -- constrainedness, but the check here is added for completeness.
11227 elsif Has_Discriminants (Act_T)
11228 and then not Has_Unknown_Discriminants (Act_T)
11231 ("actual for & must not have discriminants", Actual, Gen_T);
11232 Abandon_Instantiation (Actual);
11234 elsif Has_Discriminants (Ancestor) then
11236 ("actual for & must have known discriminants", Actual, Gen_T);
11237 Abandon_Instantiation (Actual);
11240 if not Subtypes_Statically_Compatible
11241 (Act_T, Ancestor, Formal_Derived_Matching => True)
11244 ("constraint on actual is incompatible with formal", Actual);
11245 Abandon_Instantiation (Actual);
11249 -- If the formal and actual types are abstract, check that there
11250 -- are no abstract primitives of the actual type that correspond to
11251 -- nonabstract primitives of the formal type (second sentence of
11254 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
11255 Check_Abstract_Primitives : declare
11256 Gen_Prims : constant Elist_Id :=
11257 Primitive_Operations (A_Gen_T);
11258 Gen_Elmt : Elmt_Id;
11259 Gen_Subp : Entity_Id;
11260 Anc_Subp : Entity_Id;
11261 Anc_Formal : Entity_Id;
11262 Anc_F_Type : Entity_Id;
11264 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
11265 Act_Elmt : Elmt_Id;
11266 Act_Subp : Entity_Id;
11267 Act_Formal : Entity_Id;
11268 Act_F_Type : Entity_Id;
11270 Subprograms_Correspond : Boolean;
11272 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
11273 -- Returns true if T2 is derived directly or indirectly from
11274 -- T1, including derivations from interfaces. T1 and T2 are
11275 -- required to be specific tagged base types.
11277 ------------------------
11278 -- Is_Tagged_Ancestor --
11279 ------------------------
11281 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
11283 Intfc_Elmt : Elmt_Id;
11286 -- The predicate is satisfied if the types are the same
11291 -- If we've reached the top of the derivation chain then
11292 -- we know that T1 is not an ancestor of T2.
11294 elsif Etype (T2) = T2 then
11297 -- Proceed to check T2's immediate parent
11299 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
11302 -- Finally, check to see if T1 is an ancestor of any of T2's
11306 Intfc_Elmt := First_Elmt (Interfaces (T2));
11307 while Present (Intfc_Elmt) loop
11308 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
11312 Next_Elmt (Intfc_Elmt);
11317 end Is_Tagged_Ancestor;
11319 -- Start of processing for Check_Abstract_Primitives
11322 -- Loop over all of the formal derived type's primitives
11324 Gen_Elmt := First_Elmt (Gen_Prims);
11325 while Present (Gen_Elmt) loop
11326 Gen_Subp := Node (Gen_Elmt);
11328 -- If the primitive of the formal is not abstract, then
11329 -- determine whether there is a corresponding primitive of
11330 -- the actual type that's abstract.
11332 if not Is_Abstract_Subprogram (Gen_Subp) then
11333 Act_Elmt := First_Elmt (Act_Prims);
11334 while Present (Act_Elmt) loop
11335 Act_Subp := Node (Act_Elmt);
11337 -- If we find an abstract primitive of the actual,
11338 -- then we need to test whether it corresponds to the
11339 -- subprogram from which the generic formal primitive
11342 if Is_Abstract_Subprogram (Act_Subp) then
11343 Anc_Subp := Alias (Gen_Subp);
11345 -- Test whether we have a corresponding primitive
11346 -- by comparing names, kinds, formal types, and
11349 if Chars (Anc_Subp) = Chars (Act_Subp)
11350 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
11352 Anc_Formal := First_Formal (Anc_Subp);
11353 Act_Formal := First_Formal (Act_Subp);
11354 while Present (Anc_Formal)
11355 and then Present (Act_Formal)
11357 Anc_F_Type := Etype (Anc_Formal);
11358 Act_F_Type := Etype (Act_Formal);
11360 if Ekind (Anc_F_Type)
11361 = E_Anonymous_Access_Type
11363 Anc_F_Type := Designated_Type (Anc_F_Type);
11365 if Ekind (Act_F_Type)
11366 = E_Anonymous_Access_Type
11369 Designated_Type (Act_F_Type);
11375 Ekind (Act_F_Type) = E_Anonymous_Access_Type
11380 Anc_F_Type := Base_Type (Anc_F_Type);
11381 Act_F_Type := Base_Type (Act_F_Type);
11383 -- If the formal is controlling, then the
11384 -- the type of the actual primitive's formal
11385 -- must be derived directly or indirectly
11386 -- from the type of the ancestor primitive's
11389 if Is_Controlling_Formal (Anc_Formal) then
11390 if not Is_Tagged_Ancestor
11391 (Anc_F_Type, Act_F_Type)
11396 -- Otherwise the types of the formals must
11399 elsif Anc_F_Type /= Act_F_Type then
11403 Next_Entity (Anc_Formal);
11404 Next_Entity (Act_Formal);
11407 -- If we traversed through all of the formals
11408 -- then so far the subprograms correspond, so
11409 -- now check that any result types correspond.
11411 if No (Anc_Formal) and then No (Act_Formal) then
11412 Subprograms_Correspond := True;
11414 if Ekind (Act_Subp) = E_Function then
11415 Anc_F_Type := Etype (Anc_Subp);
11416 Act_F_Type := Etype (Act_Subp);
11418 if Ekind (Anc_F_Type)
11419 = E_Anonymous_Access_Type
11422 Designated_Type (Anc_F_Type);
11424 if Ekind (Act_F_Type)
11425 = E_Anonymous_Access_Type
11428 Designated_Type (Act_F_Type);
11430 Subprograms_Correspond := False;
11435 = E_Anonymous_Access_Type
11437 Subprograms_Correspond := False;
11440 Anc_F_Type := Base_Type (Anc_F_Type);
11441 Act_F_Type := Base_Type (Act_F_Type);
11443 -- Now either the result types must be
11444 -- the same or, if the result type is
11445 -- controlling, the result type of the
11446 -- actual primitive must descend from the
11447 -- result type of the ancestor primitive.
11449 if Subprograms_Correspond
11450 and then Anc_F_Type /= Act_F_Type
11452 Has_Controlling_Result (Anc_Subp)
11454 not Is_Tagged_Ancestor
11455 (Anc_F_Type, Act_F_Type)
11457 Subprograms_Correspond := False;
11461 -- Found a matching subprogram belonging to
11462 -- formal ancestor type, so actual subprogram
11463 -- corresponds and this violates 3.9.3(9).
11465 if Subprograms_Correspond then
11467 ("abstract subprogram & overrides " &
11468 "nonabstract subprogram of ancestor",
11476 Next_Elmt (Act_Elmt);
11480 Next_Elmt (Gen_Elmt);
11482 end Check_Abstract_Primitives;
11485 -- Verify that limitedness matches. If parent is a limited
11486 -- interface then the generic formal is not unless declared
11487 -- explicitly so. If not declared limited, the actual cannot be
11488 -- limited (see AI05-0087).
11490 -- Even though this AI is a binding interpretation, we enable the
11491 -- check only in Ada 2012 mode, because this improper construct
11492 -- shows up in user code and in existing B-tests.
11494 if Is_Limited_Type (Act_T)
11495 and then not Is_Limited_Type (A_Gen_T)
11496 and then Ada_Version >= Ada_2012
11498 if In_Instance then
11502 ("actual for non-limited & cannot be a limited type", Actual,
11504 Explain_Limited_Type (Act_T, Actual);
11505 Abandon_Instantiation (Actual);
11508 end Validate_Derived_Type_Instance;
11510 ----------------------------------------
11511 -- Validate_Discriminated_Formal_Type --
11512 ----------------------------------------
11514 procedure Validate_Discriminated_Formal_Type is
11515 Formal_Discr : Entity_Id;
11516 Actual_Discr : Entity_Id;
11517 Formal_Subt : Entity_Id;
11520 if Has_Discriminants (A_Gen_T) then
11521 if not Has_Discriminants (Act_T) then
11523 ("actual for & must have discriminants", Actual, Gen_T);
11524 Abandon_Instantiation (Actual);
11526 elsif Is_Constrained (Act_T) then
11528 ("actual for & must be unconstrained", Actual, Gen_T);
11529 Abandon_Instantiation (Actual);
11532 Formal_Discr := First_Discriminant (A_Gen_T);
11533 Actual_Discr := First_Discriminant (Act_T);
11534 while Formal_Discr /= Empty loop
11535 if Actual_Discr = Empty then
11537 ("discriminants on actual do not match formal",
11539 Abandon_Instantiation (Actual);
11542 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
11544 -- Access discriminants match if designated types do
11546 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
11547 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
11548 E_Anonymous_Access_Type
11551 (Designated_Type (Base_Type (Formal_Subt))) =
11552 Designated_Type (Base_Type (Etype (Actual_Discr)))
11556 elsif Base_Type (Formal_Subt) /=
11557 Base_Type (Etype (Actual_Discr))
11560 ("types of actual discriminants must match formal",
11562 Abandon_Instantiation (Actual);
11564 elsif not Subtypes_Statically_Match
11565 (Formal_Subt, Etype (Actual_Discr))
11566 and then Ada_Version >= Ada_95
11569 ("subtypes of actual discriminants must match formal",
11571 Abandon_Instantiation (Actual);
11574 Next_Discriminant (Formal_Discr);
11575 Next_Discriminant (Actual_Discr);
11578 if Actual_Discr /= Empty then
11580 ("discriminants on actual do not match formal",
11582 Abandon_Instantiation (Actual);
11586 end Validate_Discriminated_Formal_Type;
11588 ---------------------------------------
11589 -- Validate_Incomplete_Type_Instance --
11590 ---------------------------------------
11592 procedure Validate_Incomplete_Type_Instance is
11594 if not Is_Tagged_Type (Act_T)
11595 and then Is_Tagged_Type (A_Gen_T)
11598 ("actual for & must be a tagged type", Actual, Gen_T);
11601 Validate_Discriminated_Formal_Type;
11602 end Validate_Incomplete_Type_Instance;
11604 --------------------------------------
11605 -- Validate_Interface_Type_Instance --
11606 --------------------------------------
11608 procedure Validate_Interface_Type_Instance is
11610 if not Is_Interface (Act_T) then
11612 ("actual for formal interface type must be an interface",
11615 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
11617 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
11619 Is_Protected_Interface (A_Gen_T) /=
11620 Is_Protected_Interface (Act_T)
11622 Is_Synchronized_Interface (A_Gen_T) /=
11623 Is_Synchronized_Interface (Act_T)
11626 ("actual for interface& does not match (RM 12.5.5(4))",
11629 end Validate_Interface_Type_Instance;
11631 ------------------------------------
11632 -- Validate_Private_Type_Instance --
11633 ------------------------------------
11635 procedure Validate_Private_Type_Instance is
11637 if Is_Limited_Type (Act_T)
11638 and then not Is_Limited_Type (A_Gen_T)
11640 if In_Instance then
11644 ("actual for non-limited & cannot be a limited type", Actual,
11646 Explain_Limited_Type (Act_T, Actual);
11647 Abandon_Instantiation (Actual);
11650 elsif Known_To_Have_Preelab_Init (A_Gen_T)
11651 and then not Has_Preelaborable_Initialization (Act_T)
11654 ("actual for & must have preelaborable initialization", Actual,
11657 elsif Is_Indefinite_Subtype (Act_T)
11658 and then not Is_Indefinite_Subtype (A_Gen_T)
11659 and then Ada_Version >= Ada_95
11662 ("actual for & must be a definite subtype", Actual, Gen_T);
11664 elsif not Is_Tagged_Type (Act_T)
11665 and then Is_Tagged_Type (A_Gen_T)
11668 ("actual for & must be a tagged type", Actual, Gen_T);
11671 Validate_Discriminated_Formal_Type;
11673 end Validate_Private_Type_Instance;
11675 -- Start of processing for Instantiate_Type
11678 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
11679 Error_Msg_N ("duplicate instantiation of generic type", Actual);
11680 return New_List (Error);
11682 elsif not Is_Entity_Name (Actual)
11683 or else not Is_Type (Entity (Actual))
11686 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
11687 Abandon_Instantiation (Actual);
11690 Act_T := Entity (Actual);
11692 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
11693 -- as a generic actual parameter if the corresponding formal type
11694 -- does not have a known_discriminant_part, or is a formal derived
11695 -- type that is an Unchecked_Union type.
11697 if Is_Unchecked_Union (Base_Type (Act_T)) then
11698 if not Has_Discriminants (A_Gen_T)
11700 (Is_Derived_Type (A_Gen_T)
11702 Is_Unchecked_Union (A_Gen_T))
11706 Error_Msg_N ("unchecked union cannot be the actual for a" &
11707 " discriminated formal type", Act_T);
11712 -- Deal with fixed/floating restrictions
11714 if Is_Floating_Point_Type (Act_T) then
11715 Check_Restriction (No_Floating_Point, Actual);
11716 elsif Is_Fixed_Point_Type (Act_T) then
11717 Check_Restriction (No_Fixed_Point, Actual);
11720 -- Deal with error of using incomplete type as generic actual.
11721 -- This includes limited views of a type, even if the non-limited
11722 -- view may be available.
11724 if Ekind (Act_T) = E_Incomplete_Type
11725 or else (Is_Class_Wide_Type (Act_T)
11727 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
11729 -- If the formal is an incomplete type, the actual can be
11730 -- incomplete as well.
11732 if Ekind (A_Gen_T) = E_Incomplete_Type then
11735 elsif Is_Class_Wide_Type (Act_T)
11736 or else No (Full_View (Act_T))
11738 Error_Msg_N ("premature use of incomplete type", Actual);
11739 Abandon_Instantiation (Actual);
11741 Act_T := Full_View (Act_T);
11742 Set_Entity (Actual, Act_T);
11744 if Has_Private_Component (Act_T) then
11746 ("premature use of type with private component", Actual);
11750 -- Deal with error of premature use of private type as generic actual
11752 elsif Is_Private_Type (Act_T)
11753 and then Is_Private_Type (Base_Type (Act_T))
11754 and then not Is_Generic_Type (Act_T)
11755 and then not Is_Derived_Type (Act_T)
11756 and then No (Full_View (Root_Type (Act_T)))
11758 -- If the formal is an incomplete type, the actual can be
11759 -- private or incomplete as well.
11761 if Ekind (A_Gen_T) = E_Incomplete_Type then
11764 Error_Msg_N ("premature use of private type", Actual);
11767 elsif Has_Private_Component (Act_T) then
11769 ("premature use of type with private component", Actual);
11772 Set_Instance_Of (A_Gen_T, Act_T);
11774 -- If the type is generic, the class-wide type may also be used
11776 if Is_Tagged_Type (A_Gen_T)
11777 and then Is_Tagged_Type (Act_T)
11778 and then not Is_Class_Wide_Type (A_Gen_T)
11780 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
11781 Class_Wide_Type (Act_T));
11784 if not Is_Abstract_Type (A_Gen_T)
11785 and then Is_Abstract_Type (Act_T)
11788 ("actual of non-abstract formal cannot be abstract", Actual);
11791 -- A generic scalar type is a first subtype for which we generate
11792 -- an anonymous base type. Indicate that the instance of this base
11793 -- is the base type of the actual.
11795 if Is_Scalar_Type (A_Gen_T) then
11796 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
11800 if Error_Posted (Act_T) then
11803 case Nkind (Def) is
11804 when N_Formal_Private_Type_Definition =>
11805 Validate_Private_Type_Instance;
11807 when N_Formal_Incomplete_Type_Definition =>
11808 Validate_Incomplete_Type_Instance;
11810 when N_Formal_Derived_Type_Definition =>
11811 Validate_Derived_Type_Instance;
11813 when N_Formal_Discrete_Type_Definition =>
11814 if not Is_Discrete_Type (Act_T) then
11816 ("expect discrete type in instantiation of&",
11818 Abandon_Instantiation (Actual);
11821 when N_Formal_Signed_Integer_Type_Definition =>
11822 if not Is_Signed_Integer_Type (Act_T) then
11824 ("expect signed integer type in instantiation of&",
11826 Abandon_Instantiation (Actual);
11829 when N_Formal_Modular_Type_Definition =>
11830 if not Is_Modular_Integer_Type (Act_T) then
11832 ("expect modular type in instantiation of &",
11834 Abandon_Instantiation (Actual);
11837 when N_Formal_Floating_Point_Definition =>
11838 if not Is_Floating_Point_Type (Act_T) then
11840 ("expect float type in instantiation of &", Actual, Gen_T);
11841 Abandon_Instantiation (Actual);
11844 when N_Formal_Ordinary_Fixed_Point_Definition =>
11845 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
11847 ("expect ordinary fixed point type in instantiation of &",
11849 Abandon_Instantiation (Actual);
11852 when N_Formal_Decimal_Fixed_Point_Definition =>
11853 if not Is_Decimal_Fixed_Point_Type (Act_T) then
11855 ("expect decimal type in instantiation of &",
11857 Abandon_Instantiation (Actual);
11860 when N_Array_Type_Definition =>
11861 Validate_Array_Type_Instance;
11863 when N_Access_To_Object_Definition =>
11864 Validate_Access_Type_Instance;
11866 when N_Access_Function_Definition |
11867 N_Access_Procedure_Definition =>
11868 Validate_Access_Subprogram_Instance;
11870 when N_Record_Definition =>
11871 Validate_Interface_Type_Instance;
11873 when N_Derived_Type_Definition =>
11874 Validate_Derived_Interface_Type_Instance;
11877 raise Program_Error;
11882 Subt := New_Copy (Gen_T);
11884 -- Use adjusted sloc of subtype name as the location for other nodes in
11885 -- the subtype declaration.
11887 Loc := Sloc (Subt);
11890 Make_Subtype_Declaration (Loc,
11891 Defining_Identifier => Subt,
11892 Subtype_Indication => New_Occurrence_Of (Act_T, Loc));
11894 if Is_Private_Type (Act_T) then
11895 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11897 elsif Is_Access_Type (Act_T)
11898 and then Is_Private_Type (Designated_Type (Act_T))
11900 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11903 Decl_Nodes := New_List (Decl_Node);
11905 -- Flag actual derived types so their elaboration produces the
11906 -- appropriate renamings for the primitive operations of the ancestor.
11907 -- Flag actual for formal private types as well, to determine whether
11908 -- operations in the private part may override inherited operations.
11909 -- If the formal has an interface list, the ancestor is not the
11910 -- parent, but the analyzed formal that includes the interface
11911 -- operations of all its progenitors.
11913 -- Same treatment for formal private types, so we can check whether the
11914 -- type is tagged limited when validating derivations in the private
11915 -- part. (See AI05-096).
11917 if Nkind (Def) = N_Formal_Derived_Type_Definition then
11918 if Present (Interface_List (Def)) then
11919 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11921 Set_Generic_Parent_Type (Decl_Node, Ancestor);
11924 elsif Nkind_In (Def,
11925 N_Formal_Private_Type_Definition,
11926 N_Formal_Incomplete_Type_Definition)
11928 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11931 -- If the actual is a synchronized type that implements an interface,
11932 -- the primitive operations are attached to the corresponding record,
11933 -- and we have to treat it as an additional generic actual, so that its
11934 -- primitive operations become visible in the instance. The task or
11935 -- protected type itself does not carry primitive operations.
11937 if Is_Concurrent_Type (Act_T)
11938 and then Is_Tagged_Type (Act_T)
11939 and then Present (Corresponding_Record_Type (Act_T))
11940 and then Present (Ancestor)
11941 and then Is_Interface (Ancestor)
11944 Corr_Rec : constant Entity_Id :=
11945 Corresponding_Record_Type (Act_T);
11946 New_Corr : Entity_Id;
11947 Corr_Decl : Node_Id;
11950 New_Corr := Make_Temporary (Loc, 'S');
11952 Make_Subtype_Declaration (Loc,
11953 Defining_Identifier => New_Corr,
11954 Subtype_Indication =>
11955 New_Occurrence_Of (Corr_Rec, Loc));
11956 Append_To (Decl_Nodes, Corr_Decl);
11958 if Ekind (Act_T) = E_Task_Type then
11959 Set_Ekind (Subt, E_Task_Subtype);
11961 Set_Ekind (Subt, E_Protected_Subtype);
11964 Set_Corresponding_Record_Type (Subt, Corr_Rec);
11965 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
11966 Set_Generic_Parent_Type (Decl_Node, Empty);
11971 end Instantiate_Type;
11973 ---------------------
11974 -- Is_In_Main_Unit --
11975 ---------------------
11977 function Is_In_Main_Unit (N : Node_Id) return Boolean is
11978 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
11979 Current_Unit : Node_Id;
11982 if Unum = Main_Unit then
11985 -- If the current unit is a subunit then it is either the main unit or
11986 -- is being compiled as part of the main unit.
11988 elsif Nkind (N) = N_Compilation_Unit then
11989 return Nkind (Unit (N)) = N_Subunit;
11992 Current_Unit := Parent (N);
11993 while Present (Current_Unit)
11994 and then Nkind (Current_Unit) /= N_Compilation_Unit
11996 Current_Unit := Parent (Current_Unit);
11999 -- The instantiation node is in the main unit, or else the current node
12000 -- (perhaps as the result of nested instantiations) is in the main unit,
12001 -- or in the declaration of the main unit, which in this last case must
12004 return Unum = Main_Unit
12005 or else Current_Unit = Cunit (Main_Unit)
12006 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
12007 or else (Present (Library_Unit (Current_Unit))
12008 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
12009 end Is_In_Main_Unit;
12011 ----------------------------
12012 -- Load_Parent_Of_Generic --
12013 ----------------------------
12015 procedure Load_Parent_Of_Generic
12018 Body_Optional : Boolean := False)
12020 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
12021 Saved_Style_Check : constant Boolean := Style_Check;
12022 Saved_Warnings : constant Warning_Record := Save_Warnings;
12023 True_Parent : Node_Id;
12024 Inst_Node : Node_Id;
12026 Previous_Instances : constant Elist_Id := New_Elmt_List;
12028 procedure Collect_Previous_Instances (Decls : List_Id);
12029 -- Collect all instantiations in the given list of declarations, that
12030 -- precede the generic that we need to load. If the bodies of these
12031 -- instantiations are available, we must analyze them, to ensure that
12032 -- the public symbols generated are the same when the unit is compiled
12033 -- to generate code, and when it is compiled in the context of a unit
12034 -- that needs a particular nested instance. This process is applied to
12035 -- both package and subprogram instances.
12037 --------------------------------
12038 -- Collect_Previous_Instances --
12039 --------------------------------
12041 procedure Collect_Previous_Instances (Decls : List_Id) is
12045 Decl := First (Decls);
12046 while Present (Decl) loop
12047 if Sloc (Decl) >= Sloc (Inst_Node) then
12050 -- If Decl is an instantiation, then record it as requiring
12051 -- instantiation of the corresponding body, except if it is an
12052 -- abbreviated instantiation generated internally for conformance
12053 -- checking purposes only for the case of a formal package
12054 -- declared without a box (see Instantiate_Formal_Package). Such
12055 -- an instantiation does not generate any code (the actual code
12056 -- comes from actual) and thus does not need to be analyzed here.
12057 -- If the instantiation appears with a generic package body it is
12058 -- not analyzed here either.
12060 elsif Nkind (Decl) = N_Package_Instantiation
12061 and then not Is_Internal (Defining_Entity (Decl))
12063 Append_Elmt (Decl, Previous_Instances);
12065 -- For a subprogram instantiation, omit instantiations intrinsic
12066 -- operations (Unchecked_Conversions, etc.) that have no bodies.
12068 elsif Nkind_In (Decl, N_Function_Instantiation,
12069 N_Procedure_Instantiation)
12070 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
12072 Append_Elmt (Decl, Previous_Instances);
12074 elsif Nkind (Decl) = N_Package_Declaration then
12075 Collect_Previous_Instances
12076 (Visible_Declarations (Specification (Decl)));
12077 Collect_Previous_Instances
12078 (Private_Declarations (Specification (Decl)));
12080 -- Previous non-generic bodies may contain instances as well
12082 elsif Nkind (Decl) = N_Package_Body
12083 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
12085 Collect_Previous_Instances (Declarations (Decl));
12087 elsif Nkind (Decl) = N_Subprogram_Body
12088 and then not Acts_As_Spec (Decl)
12089 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
12091 Collect_Previous_Instances (Declarations (Decl));
12096 end Collect_Previous_Instances;
12098 -- Start of processing for Load_Parent_Of_Generic
12101 if not In_Same_Source_Unit (N, Spec)
12102 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
12103 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
12104 and then not Is_In_Main_Unit (Spec))
12106 -- Find body of parent of spec, and analyze it. A special case arises
12107 -- when the parent is an instantiation, that is to say when we are
12108 -- currently instantiating a nested generic. In that case, there is
12109 -- no separate file for the body of the enclosing instance. Instead,
12110 -- the enclosing body must be instantiated as if it were a pending
12111 -- instantiation, in order to produce the body for the nested generic
12112 -- we require now. Note that in that case the generic may be defined
12113 -- in a package body, the instance defined in the same package body,
12114 -- and the original enclosing body may not be in the main unit.
12116 Inst_Node := Empty;
12118 True_Parent := Parent (Spec);
12119 while Present (True_Parent)
12120 and then Nkind (True_Parent) /= N_Compilation_Unit
12122 if Nkind (True_Parent) = N_Package_Declaration
12124 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
12126 -- Parent is a compilation unit that is an instantiation.
12127 -- Instantiation node has been replaced with package decl.
12129 Inst_Node := Original_Node (True_Parent);
12132 elsif Nkind (True_Parent) = N_Package_Declaration
12133 and then Present (Generic_Parent (Specification (True_Parent)))
12134 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
12136 -- Parent is an instantiation within another specification.
12137 -- Declaration for instance has been inserted before original
12138 -- instantiation node. A direct link would be preferable?
12140 Inst_Node := Next (True_Parent);
12141 while Present (Inst_Node)
12142 and then Nkind (Inst_Node) /= N_Package_Instantiation
12147 -- If the instance appears within a generic, and the generic
12148 -- unit is defined within a formal package of the enclosing
12149 -- generic, there is no generic body available, and none
12150 -- needed. A more precise test should be used ???
12152 if No (Inst_Node) then
12159 True_Parent := Parent (True_Parent);
12163 -- Case where we are currently instantiating a nested generic
12165 if Present (Inst_Node) then
12166 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
12168 -- Instantiation node and declaration of instantiated package
12169 -- were exchanged when only the declaration was needed.
12170 -- Restore instantiation node before proceeding with body.
12172 Set_Unit (Parent (True_Parent), Inst_Node);
12175 -- Now complete instantiation of enclosing body, if it appears in
12176 -- some other unit. If it appears in the current unit, the body
12177 -- will have been instantiated already.
12179 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
12181 -- We need to determine the expander mode to instantiate the
12182 -- enclosing body. Because the generic body we need may use
12183 -- global entities declared in the enclosing package (including
12184 -- aggregates) it is in general necessary to compile this body
12185 -- with expansion enabled, except if we are within a generic
12186 -- package, in which case the usual generic rule applies.
12189 Exp_Status : Boolean := True;
12193 -- Loop through scopes looking for generic package
12195 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
12196 while Present (Scop)
12197 and then Scop /= Standard_Standard
12199 if Ekind (Scop) = E_Generic_Package then
12200 Exp_Status := False;
12204 Scop := Scope (Scop);
12207 -- Collect previous instantiations in the unit that contains
12208 -- the desired generic.
12210 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
12211 and then not Body_Optional
12215 Info : Pending_Body_Info;
12219 Par := Parent (Inst_Node);
12220 while Present (Par) loop
12221 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
12222 Par := Parent (Par);
12225 pragma Assert (Present (Par));
12227 if Nkind (Par) = N_Package_Body then
12228 Collect_Previous_Instances (Declarations (Par));
12230 elsif Nkind (Par) = N_Package_Declaration then
12231 Collect_Previous_Instances
12232 (Visible_Declarations (Specification (Par)));
12233 Collect_Previous_Instances
12234 (Private_Declarations (Specification (Par)));
12237 -- Enclosing unit is a subprogram body. In this
12238 -- case all instance bodies are processed in order
12239 -- and there is no need to collect them separately.
12244 Decl := First_Elmt (Previous_Instances);
12245 while Present (Decl) loop
12247 (Inst_Node => Node (Decl),
12249 Instance_Spec (Node (Decl)),
12250 Expander_Status => Exp_Status,
12251 Current_Sem_Unit =>
12252 Get_Code_Unit (Sloc (Node (Decl))),
12253 Scope_Suppress => Scope_Suppress,
12254 Local_Suppress_Stack_Top =>
12255 Local_Suppress_Stack_Top,
12256 Version => Ada_Version,
12257 Version_Pragma => Ada_Version_Pragma,
12258 Warnings => Save_Warnings,
12259 SPARK_Mode => SPARK_Mode,
12260 SPARK_Mode_Pragma => SPARK_Mode_Pragma);
12262 -- Package instance
12265 Nkind (Node (Decl)) = N_Package_Instantiation
12267 Instantiate_Package_Body
12268 (Info, Body_Optional => True);
12270 -- Subprogram instance
12273 -- The instance_spec is the wrapper package,
12274 -- and the subprogram declaration is the last
12275 -- declaration in the wrapper.
12279 (Visible_Declarations
12280 (Specification (Info.Act_Decl)));
12282 Instantiate_Subprogram_Body
12283 (Info, Body_Optional => True);
12291 Instantiate_Package_Body
12293 ((Inst_Node => Inst_Node,
12294 Act_Decl => True_Parent,
12295 Expander_Status => Exp_Status,
12296 Current_Sem_Unit => Get_Code_Unit
12297 (Sloc (Inst_Node)),
12298 Scope_Suppress => Scope_Suppress,
12299 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
12300 Version => Ada_Version,
12301 Version_Pragma => Ada_Version_Pragma,
12302 Warnings => Save_Warnings,
12303 SPARK_Mode => SPARK_Mode,
12304 SPARK_Mode_Pragma => SPARK_Mode_Pragma)),
12305 Body_Optional => Body_Optional);
12309 -- Case where we are not instantiating a nested generic
12312 Opt.Style_Check := False;
12313 Expander_Mode_Save_And_Set (True);
12314 Load_Needed_Body (Comp_Unit, OK);
12315 Opt.Style_Check := Saved_Style_Check;
12316 Restore_Warnings (Saved_Warnings);
12317 Expander_Mode_Restore;
12320 and then Unit_Requires_Body (Defining_Entity (Spec))
12321 and then not Body_Optional
12324 Bname : constant Unit_Name_Type :=
12325 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
12328 -- In CodePeer mode, the missing body may make the analysis
12329 -- incomplete, but we do not treat it as fatal.
12331 if CodePeer_Mode then
12335 Error_Msg_Unit_1 := Bname;
12336 Error_Msg_N ("this instantiation requires$!", N);
12337 Error_Msg_File_1 :=
12338 Get_File_Name (Bname, Subunit => False);
12339 Error_Msg_N ("\but file{ was not found!", N);
12340 raise Unrecoverable_Error;
12347 -- If loading parent of the generic caused an instantiation circularity,
12348 -- we abandon compilation at this point, because otherwise in some cases
12349 -- we get into trouble with infinite recursions after this point.
12351 if Circularity_Detected then
12352 raise Unrecoverable_Error;
12354 end Load_Parent_Of_Generic;
12356 ---------------------------------
12357 -- Map_Formal_Package_Entities --
12358 ---------------------------------
12360 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
12365 Set_Instance_Of (Form, Act);
12367 -- Traverse formal and actual package to map the corresponding entities.
12368 -- We skip over internal entities that may be generated during semantic
12369 -- analysis, and find the matching entities by name, given that they
12370 -- must appear in the same order.
12372 E1 := First_Entity (Form);
12373 E2 := First_Entity (Act);
12374 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
12375 -- Could this test be a single condition??? Seems like it could, and
12376 -- isn't FPE (Form) a constant anyway???
12378 if not Is_Internal (E1)
12379 and then Present (Parent (E1))
12380 and then not Is_Class_Wide_Type (E1)
12381 and then not Is_Internal_Name (Chars (E1))
12383 while Present (E2) and then Chars (E2) /= Chars (E1) loop
12390 Set_Instance_Of (E1, E2);
12392 if Is_Type (E1) and then Is_Tagged_Type (E2) then
12393 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
12396 if Is_Constrained (E1) then
12397 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
12400 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
12401 Map_Formal_Package_Entities (E1, E2);
12408 end Map_Formal_Package_Entities;
12410 -----------------------
12411 -- Move_Freeze_Nodes --
12412 -----------------------
12414 procedure Move_Freeze_Nodes
12415 (Out_Of : Entity_Id;
12420 Next_Decl : Node_Id;
12421 Next_Node : Node_Id := After;
12424 function Is_Outer_Type (T : Entity_Id) return Boolean;
12425 -- Check whether entity is declared in a scope external to that of the
12428 -------------------
12429 -- Is_Outer_Type --
12430 -------------------
12432 function Is_Outer_Type (T : Entity_Id) return Boolean is
12433 Scop : Entity_Id := Scope (T);
12436 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
12440 while Scop /= Standard_Standard loop
12441 if Scop = Out_Of then
12444 Scop := Scope (Scop);
12452 -- Start of processing for Move_Freeze_Nodes
12459 -- First remove the freeze nodes that may appear before all other
12463 while Present (Decl)
12464 and then Nkind (Decl) = N_Freeze_Entity
12465 and then Is_Outer_Type (Entity (Decl))
12467 Decl := Remove_Head (L);
12468 Insert_After (Next_Node, Decl);
12469 Set_Analyzed (Decl, False);
12474 -- Next scan the list of declarations and remove each freeze node that
12475 -- appears ahead of the current node.
12477 while Present (Decl) loop
12478 while Present (Next (Decl))
12479 and then Nkind (Next (Decl)) = N_Freeze_Entity
12480 and then Is_Outer_Type (Entity (Next (Decl)))
12482 Next_Decl := Remove_Next (Decl);
12483 Insert_After (Next_Node, Next_Decl);
12484 Set_Analyzed (Next_Decl, False);
12485 Next_Node := Next_Decl;
12488 -- If the declaration is a nested package or concurrent type, then
12489 -- recurse. Nested generic packages will have been processed from the
12492 case Nkind (Decl) is
12493 when N_Package_Declaration =>
12494 Spec := Specification (Decl);
12496 when N_Task_Type_Declaration =>
12497 Spec := Task_Definition (Decl);
12499 when N_Protected_Type_Declaration =>
12500 Spec := Protected_Definition (Decl);
12506 if Present (Spec) then
12507 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
12508 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
12513 end Move_Freeze_Nodes;
12519 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
12521 return Generic_Renamings.Table (E).Next_In_HTable;
12524 ------------------------
12525 -- Preanalyze_Actuals --
12526 ------------------------
12528 procedure Preanalyze_Actuals (N : Node_Id) is
12531 Errs : constant Int := Serious_Errors_Detected;
12533 Cur : Entity_Id := Empty;
12534 -- Current homograph of the instance name
12537 -- Saved visibility status of the current homograph
12540 Assoc := First (Generic_Associations (N));
12542 -- If the instance is a child unit, its name may hide an outer homonym,
12543 -- so make it invisible to perform name resolution on the actuals.
12545 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
12547 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
12549 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
12551 if Is_Compilation_Unit (Cur) then
12552 Vis := Is_Immediately_Visible (Cur);
12553 Set_Is_Immediately_Visible (Cur, False);
12559 while Present (Assoc) loop
12560 if Nkind (Assoc) /= N_Others_Choice then
12561 Act := Explicit_Generic_Actual_Parameter (Assoc);
12563 -- Within a nested instantiation, a defaulted actual is an empty
12564 -- association, so nothing to analyze. If the subprogram actual
12565 -- is an attribute, analyze prefix only, because actual is not a
12566 -- complete attribute reference.
12568 -- If actual is an allocator, analyze expression only. The full
12569 -- analysis can generate code, and if instance is a compilation
12570 -- unit we have to wait until the package instance is installed
12571 -- to have a proper place to insert this code.
12573 -- String literals may be operators, but at this point we do not
12574 -- know whether the actual is a formal subprogram or a string.
12579 elsif Nkind (Act) = N_Attribute_Reference then
12580 Analyze (Prefix (Act));
12582 elsif Nkind (Act) = N_Explicit_Dereference then
12583 Analyze (Prefix (Act));
12585 elsif Nkind (Act) = N_Allocator then
12587 Expr : constant Node_Id := Expression (Act);
12590 if Nkind (Expr) = N_Subtype_Indication then
12591 Analyze (Subtype_Mark (Expr));
12593 -- Analyze separately each discriminant constraint, when
12594 -- given with a named association.
12600 Constr := First (Constraints (Constraint (Expr)));
12601 while Present (Constr) loop
12602 if Nkind (Constr) = N_Discriminant_Association then
12603 Analyze (Expression (Constr));
12617 elsif Nkind (Act) /= N_Operator_Symbol then
12621 -- Ensure that a ghost subprogram does not act as generic actual
12623 if Is_Entity_Name (Act)
12624 and then Is_Ghost_Subprogram (Entity (Act))
12627 ("ghost subprogram & cannot act as generic actual", Act);
12628 Abandon_Instantiation (Act);
12630 elsif Errs /= Serious_Errors_Detected then
12632 -- Do a minimal analysis of the generic, to prevent spurious
12633 -- warnings complaining about the generic being unreferenced,
12634 -- before abandoning the instantiation.
12636 Analyze (Name (N));
12638 if Is_Entity_Name (Name (N))
12639 and then Etype (Name (N)) /= Any_Type
12641 Generate_Reference (Entity (Name (N)), Name (N));
12642 Set_Is_Instantiated (Entity (Name (N)));
12645 if Present (Cur) then
12647 -- For the case of a child instance hiding an outer homonym,
12648 -- provide additional warning which might explain the error.
12650 Set_Is_Immediately_Visible (Cur, Vis);
12651 Error_Msg_NE ("& hides outer unit with the same name??",
12652 N, Defining_Unit_Name (N));
12655 Abandon_Instantiation (Act);
12662 if Present (Cur) then
12663 Set_Is_Immediately_Visible (Cur, Vis);
12665 end Preanalyze_Actuals;
12667 -------------------
12668 -- Remove_Parent --
12669 -------------------
12671 procedure Remove_Parent (In_Body : Boolean := False) is
12672 S : Entity_Id := Current_Scope;
12673 -- S is the scope containing the instantiation just completed. The scope
12674 -- stack contains the parent instances of the instantiation, followed by
12683 -- After child instantiation is complete, remove from scope stack the
12684 -- extra copy of the current scope, and then remove parent instances.
12686 if not In_Body then
12689 while Current_Scope /= S loop
12690 P := Current_Scope;
12691 End_Package_Scope (Current_Scope);
12693 if In_Open_Scopes (P) then
12694 E := First_Entity (P);
12695 while Present (E) loop
12696 Set_Is_Immediately_Visible (E, True);
12700 -- If instantiation is declared in a block, it is the enclosing
12701 -- scope that might be a parent instance. Note that only one
12702 -- block can be involved, because the parent instances have
12703 -- been installed within it.
12705 if Ekind (P) = E_Block then
12706 Cur_P := Scope (P);
12711 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
12712 -- We are within an instance of some sibling. Retain
12713 -- visibility of parent, for proper subsequent cleanup, and
12714 -- reinstall private declarations as well.
12716 Set_In_Private_Part (P);
12717 Install_Private_Declarations (P);
12720 -- If the ultimate parent is a top-level unit recorded in
12721 -- Instance_Parent_Unit, then reset its visibility to what it was
12722 -- before instantiation. (It's not clear what the purpose is of
12723 -- testing whether Scope (P) is In_Open_Scopes, but that test was
12724 -- present before the ultimate parent test was added.???)
12726 elsif not In_Open_Scopes (Scope (P))
12727 or else (P = Instance_Parent_Unit
12728 and then not Parent_Unit_Visible)
12730 Set_Is_Immediately_Visible (P, False);
12732 -- If the current scope is itself an instantiation of a generic
12733 -- nested within P, and we are in the private part of body of this
12734 -- instantiation, restore the full views of P, that were removed
12735 -- in End_Package_Scope above. This obscure case can occur when a
12736 -- subunit of a generic contains an instance of a child unit of
12737 -- its generic parent unit.
12739 elsif S = Current_Scope and then Is_Generic_Instance (S) then
12741 Par : constant Entity_Id :=
12742 Generic_Parent (Package_Specification (S));
12745 and then P = Scope (Par)
12746 and then (In_Package_Body (S) or else In_Private_Part (S))
12748 Set_In_Private_Part (P);
12749 Install_Private_Declarations (P);
12755 -- Reset visibility of entities in the enclosing scope
12757 Set_Is_Hidden_Open_Scope (Current_Scope, False);
12759 Hidden := First_Elmt (Hidden_Entities);
12760 while Present (Hidden) loop
12761 Set_Is_Immediately_Visible (Node (Hidden), True);
12762 Next_Elmt (Hidden);
12766 -- Each body is analyzed separately, and there is no context that
12767 -- needs preserving from one body instance to the next, so remove all
12768 -- parent scopes that have been installed.
12770 while Present (S) loop
12771 End_Package_Scope (S);
12772 Set_Is_Immediately_Visible (S, False);
12773 S := Current_Scope;
12774 exit when S = Standard_Standard;
12783 procedure Restore_Env is
12784 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
12787 if No (Current_Instantiated_Parent.Act_Id) then
12788 -- Restore environment after subprogram inlining
12790 Restore_Private_Views (Empty);
12793 Current_Instantiated_Parent := Saved.Instantiated_Parent;
12794 Exchanged_Views := Saved.Exchanged_Views;
12795 Hidden_Entities := Saved.Hidden_Entities;
12796 Current_Sem_Unit := Saved.Current_Sem_Unit;
12797 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
12798 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
12800 Restore_Opt_Config_Switches (Saved.Switches);
12802 Instance_Envs.Decrement_Last;
12805 ---------------------------
12806 -- Restore_Private_Views --
12807 ---------------------------
12809 procedure Restore_Private_Views
12810 (Pack_Id : Entity_Id;
12811 Is_Package : Boolean := True)
12816 Dep_Elmt : Elmt_Id;
12819 procedure Restore_Nested_Formal (Formal : Entity_Id);
12820 -- Hide the generic formals of formal packages declared with box which
12821 -- were reachable in the current instantiation.
12823 ---------------------------
12824 -- Restore_Nested_Formal --
12825 ---------------------------
12827 procedure Restore_Nested_Formal (Formal : Entity_Id) is
12831 if Present (Renamed_Object (Formal))
12832 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
12836 elsif Present (Associated_Formal_Package (Formal)) then
12837 Ent := First_Entity (Formal);
12838 while Present (Ent) loop
12839 exit when Ekind (Ent) = E_Package
12840 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
12842 Set_Is_Hidden (Ent);
12843 Set_Is_Potentially_Use_Visible (Ent, False);
12845 -- If package, then recurse
12847 if Ekind (Ent) = E_Package then
12848 Restore_Nested_Formal (Ent);
12854 end Restore_Nested_Formal;
12856 -- Start of processing for Restore_Private_Views
12859 M := First_Elmt (Exchanged_Views);
12860 while Present (M) loop
12863 -- Subtypes of types whose views have been exchanged, and that are
12864 -- defined within the instance, were not on the Private_Dependents
12865 -- list on entry to the instance, so they have to be exchanged
12866 -- explicitly now, in order to remain consistent with the view of the
12869 if Ekind_In (Typ, E_Private_Type,
12870 E_Limited_Private_Type,
12871 E_Record_Type_With_Private)
12873 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
12874 while Present (Dep_Elmt) loop
12875 Dep_Typ := Node (Dep_Elmt);
12877 if Scope (Dep_Typ) = Pack_Id
12878 and then Present (Full_View (Dep_Typ))
12880 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
12881 Exchange_Declarations (Dep_Typ);
12884 Next_Elmt (Dep_Elmt);
12888 Exchange_Declarations (Node (M));
12892 if No (Pack_Id) then
12896 -- Make the generic formal parameters private, and make the formal types
12897 -- into subtypes of the actuals again.
12899 E := First_Entity (Pack_Id);
12900 while Present (E) loop
12901 Set_Is_Hidden (E, True);
12904 and then Nkind (Parent (E)) = N_Subtype_Declaration
12906 -- If the actual for E is itself a generic actual type from
12907 -- an enclosing instance, E is still a generic actual type
12908 -- outside of the current instance. This matter when resolving
12909 -- an overloaded call that may be ambiguous in the enclosing
12910 -- instance, when two of its actuals coincide.
12912 if Is_Entity_Name (Subtype_Indication (Parent (E)))
12913 and then Is_Generic_Actual_Type
12914 (Entity (Subtype_Indication (Parent (E))))
12918 Set_Is_Generic_Actual_Type (E, False);
12921 -- An unusual case of aliasing: the actual may also be directly
12922 -- visible in the generic, and be private there, while it is fully
12923 -- visible in the context of the instance. The internal subtype
12924 -- is private in the instance but has full visibility like its
12925 -- parent in the enclosing scope. This enforces the invariant that
12926 -- the privacy status of all private dependents of a type coincide
12927 -- with that of the parent type. This can only happen when a
12928 -- generic child unit is instantiated within a sibling.
12930 if Is_Private_Type (E)
12931 and then not Is_Private_Type (Etype (E))
12933 Exchange_Declarations (E);
12936 elsif Ekind (E) = E_Package then
12938 -- The end of the renaming list is the renaming of the generic
12939 -- package itself. If the instance is a subprogram, all entities
12940 -- in the corresponding package are renamings. If this entity is
12941 -- a formal package, make its own formals private as well. The
12942 -- actual in this case is itself the renaming of an instantiation.
12943 -- If the entity is not a package renaming, it is the entity
12944 -- created to validate formal package actuals: ignore it.
12946 -- If the actual is itself a formal package for the enclosing
12947 -- generic, or the actual for such a formal package, it remains
12948 -- visible on exit from the instance, and therefore nothing needs
12949 -- to be done either, except to keep it accessible.
12951 if Is_Package and then Renamed_Object (E) = Pack_Id then
12954 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
12958 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
12960 Set_Is_Hidden (E, False);
12964 Act_P : constant Entity_Id := Renamed_Object (E);
12968 Id := First_Entity (Act_P);
12970 and then Id /= First_Private_Entity (Act_P)
12972 exit when Ekind (Id) = E_Package
12973 and then Renamed_Object (Id) = Act_P;
12975 Set_Is_Hidden (Id, True);
12976 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
12978 if Ekind (Id) = E_Package then
12979 Restore_Nested_Formal (Id);
12990 end Restore_Private_Views;
12997 (Gen_Unit : Entity_Id;
12998 Act_Unit : Entity_Id)
13002 Set_Instance_Env (Gen_Unit, Act_Unit);
13005 ----------------------------
13006 -- Save_Global_References --
13007 ----------------------------
13009 procedure Save_Global_References (N : Node_Id) is
13010 Gen_Scope : Entity_Id;
13014 function Is_Global (E : Entity_Id) return Boolean;
13015 -- Check whether entity is defined outside of generic unit. Examine the
13016 -- scope of an entity, and the scope of the scope, etc, until we find
13017 -- either Standard, in which case the entity is global, or the generic
13018 -- unit itself, which indicates that the entity is local. If the entity
13019 -- is the generic unit itself, as in the case of a recursive call, or
13020 -- the enclosing generic unit, if different from the current scope, then
13021 -- it is local as well, because it will be replaced at the point of
13022 -- instantiation. On the other hand, if it is a reference to a child
13023 -- unit of a common ancestor, which appears in an instantiation, it is
13024 -- global because it is used to denote a specific compilation unit at
13025 -- the time the instantiations will be analyzed.
13027 procedure Reset_Entity (N : Node_Id);
13028 -- Save semantic information on global entity so that it is not resolved
13029 -- again at instantiation time.
13031 procedure Save_Entity_Descendants (N : Node_Id);
13032 -- Apply Save_Global_References to the two syntactic descendants of
13033 -- non-terminal nodes that carry an Associated_Node and are processed
13034 -- through Reset_Entity. Once the global entity (if any) has been
13035 -- captured together with its type, only two syntactic descendants need
13036 -- to be traversed to complete the processing of the tree rooted at N.
13037 -- This applies to Selected_Components, Expanded_Names, and to Operator
13038 -- nodes. N can also be a character literal, identifier, or operator
13039 -- symbol node, but the call has no effect in these cases.
13041 procedure Save_Global_Defaults (N1, N2 : Node_Id);
13042 -- Default actuals in nested instances must be handled specially
13043 -- because there is no link to them from the original tree. When an
13044 -- actual subprogram is given by a default, we add an explicit generic
13045 -- association for it in the instantiation node. When we save the
13046 -- global references on the name of the instance, we recover the list
13047 -- of generic associations, and add an explicit one to the original
13048 -- generic tree, through which a global actual can be preserved.
13049 -- Similarly, if a child unit is instantiated within a sibling, in the
13050 -- context of the parent, we must preserve the identifier of the parent
13051 -- so that it can be properly resolved in a subsequent instantiation.
13053 procedure Save_Global_Descendant (D : Union_Id);
13054 -- Apply Save_Global_References recursively to the descendents of the
13057 procedure Save_References (N : Node_Id);
13058 -- This is the recursive procedure that does the work, once the
13059 -- enclosing generic scope has been established.
13065 function Is_Global (E : Entity_Id) return Boolean is
13068 function Is_Instance_Node (Decl : Node_Id) return Boolean;
13069 -- Determine whether the parent node of a reference to a child unit
13070 -- denotes an instantiation or a formal package, in which case the
13071 -- reference to the child unit is global, even if it appears within
13072 -- the current scope (e.g. when the instance appears within the body
13073 -- of an ancestor).
13075 ----------------------
13076 -- Is_Instance_Node --
13077 ----------------------
13079 function Is_Instance_Node (Decl : Node_Id) return Boolean is
13081 return Nkind (Decl) in N_Generic_Instantiation
13083 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
13084 end Is_Instance_Node;
13086 -- Start of processing for Is_Global
13089 if E = Gen_Scope then
13092 elsif E = Standard_Standard then
13095 elsif Is_Child_Unit (E)
13096 and then (Is_Instance_Node (Parent (N2))
13097 or else (Nkind (Parent (N2)) = N_Expanded_Name
13098 and then N2 = Selector_Name (Parent (N2))
13100 Is_Instance_Node (Parent (Parent (N2)))))
13106 while Se /= Gen_Scope loop
13107 if Se = Standard_Standard then
13122 procedure Reset_Entity (N : Node_Id) is
13124 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
13125 -- If the type of N2 is global to the generic unit, save the type in
13126 -- the generic node. Just as we perform name capture for explicit
13127 -- references within the generic, we must capture the global types
13128 -- of local entities because they may participate in resolution in
13131 function Top_Ancestor (E : Entity_Id) return Entity_Id;
13132 -- Find the ultimate ancestor of the current unit. If it is not a
13133 -- generic unit, then the name of the current unit in the prefix of
13134 -- an expanded name must be replaced with its generic homonym to
13135 -- ensure that it will be properly resolved in an instance.
13137 ---------------------
13138 -- Set_Global_Type --
13139 ---------------------
13141 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
13142 Typ : constant Entity_Id := Etype (N2);
13145 Set_Etype (N, Typ);
13147 if Entity (N) /= N2
13148 and then Has_Private_View (Entity (N))
13150 -- If the entity of N is not the associated node, this is a
13151 -- nested generic and it has an associated node as well, whose
13152 -- type is already the full view (see below). Indicate that the
13153 -- original node has a private view.
13155 Set_Has_Private_View (N);
13158 -- If not a private type, nothing else to do
13160 if not Is_Private_Type (Typ) then
13161 if Is_Array_Type (Typ)
13162 and then Is_Private_Type (Component_Type (Typ))
13164 Set_Has_Private_View (N);
13167 -- If it is a derivation of a private type in a context where no
13168 -- full view is needed, nothing to do either.
13170 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
13173 -- Otherwise mark the type for flipping and use the full view when
13177 Set_Has_Private_View (N);
13179 if Present (Full_View (Typ)) then
13180 Set_Etype (N2, Full_View (Typ));
13183 end Set_Global_Type;
13189 function Top_Ancestor (E : Entity_Id) return Entity_Id is
13194 while Is_Child_Unit (Par) loop
13195 Par := Scope (Par);
13201 -- Start of processing for Reset_Entity
13204 N2 := Get_Associated_Node (N);
13207 if Present (E) then
13209 -- If the node is an entry call to an entry in an enclosing task,
13210 -- it is rewritten as a selected component. No global entity to
13211 -- preserve in this case, since the expansion will be redone in
13214 if not Nkind_In (E, N_Defining_Identifier,
13215 N_Defining_Character_Literal,
13216 N_Defining_Operator_Symbol)
13218 Set_Associated_Node (N, Empty);
13219 Set_Etype (N, Empty);
13223 -- If the entity is an itype created as a subtype of an access
13224 -- type with a null exclusion restore source entity for proper
13225 -- visibility. The itype will be created anew in the instance.
13228 and then Ekind (E) = E_Access_Subtype
13229 and then Is_Entity_Name (N)
13230 and then Chars (Etype (E)) = Chars (N)
13233 Set_Entity (N2, E);
13237 if Is_Global (E) then
13239 -- If the entity is a package renaming that is the prefix of
13240 -- an expanded name, it has been rewritten as the renamed
13241 -- package, which is necessary semantically but complicates
13242 -- ASIS tree traversal, so we recover the original entity to
13243 -- expose the renaming. Take into account that the context may
13244 -- be a nested generic, that the original node may itself have
13245 -- an associated node that had better be an entity, and that
13246 -- the current node is still a selected component.
13248 if Ekind (E) = E_Package
13249 and then Nkind (N) = N_Selected_Component
13250 and then Nkind (Parent (N)) = N_Expanded_Name
13251 and then Present (Original_Node (N2))
13252 and then Is_Entity_Name (Original_Node (N2))
13253 and then Present (Entity (Original_Node (N2)))
13255 if Is_Global (Entity (Original_Node (N2))) then
13256 N2 := Original_Node (N2);
13257 Set_Associated_Node (N, N2);
13258 Set_Global_Type (N, N2);
13261 -- Renaming is local, and will be resolved in instance
13263 Set_Associated_Node (N, Empty);
13264 Set_Etype (N, Empty);
13268 Set_Global_Type (N, N2);
13271 elsif Nkind (N) = N_Op_Concat
13272 and then Is_Generic_Type (Etype (N2))
13273 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
13275 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
13276 and then Is_Intrinsic_Subprogram (E)
13281 -- Entity is local. Mark generic node as unresolved.
13282 -- Note that now it does not have an entity.
13284 Set_Associated_Node (N, Empty);
13285 Set_Etype (N, Empty);
13288 if Nkind (Parent (N)) in N_Generic_Instantiation
13289 and then N = Name (Parent (N))
13291 Save_Global_Defaults (Parent (N), Parent (N2));
13294 elsif Nkind (Parent (N)) = N_Selected_Component
13295 and then Nkind (Parent (N2)) = N_Expanded_Name
13297 if Is_Global (Entity (Parent (N2))) then
13298 Change_Selected_Component_To_Expanded_Name (Parent (N));
13299 Set_Associated_Node (Parent (N), Parent (N2));
13300 Set_Global_Type (Parent (N), Parent (N2));
13301 Save_Entity_Descendants (N);
13303 -- If this is a reference to the current generic entity, replace
13304 -- by the name of the generic homonym of the current package. This
13305 -- is because in an instantiation Par.P.Q will not resolve to the
13306 -- name of the instance, whose enclosing scope is not necessarily
13307 -- Par. We use the generic homonym rather that the name of the
13308 -- generic itself because it may be hidden by a local declaration.
13310 elsif In_Open_Scopes (Entity (Parent (N2)))
13312 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
13314 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
13315 Rewrite (Parent (N),
13316 Make_Identifier (Sloc (N),
13318 Chars (Generic_Homonym (Entity (Parent (N2))))));
13320 Rewrite (Parent (N),
13321 Make_Identifier (Sloc (N),
13322 Chars => Chars (Selector_Name (Parent (N2)))));
13326 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
13327 and then Parent (N) = Name (Parent (Parent (N)))
13329 Save_Global_Defaults
13330 (Parent (Parent (N)), Parent (Parent ((N2))));
13333 -- A selected component may denote a static constant that has been
13334 -- folded. If the static constant is global to the generic, capture
13335 -- its value. Otherwise the folding will happen in any instantiation.
13337 elsif Nkind (Parent (N)) = N_Selected_Component
13338 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
13340 if Present (Entity (Original_Node (Parent (N2))))
13341 and then Is_Global (Entity (Original_Node (Parent (N2))))
13343 Rewrite (Parent (N), New_Copy (Parent (N2)));
13344 Set_Analyzed (Parent (N), False);
13350 -- A selected component may be transformed into a parameterless
13351 -- function call. If the called entity is global, rewrite the node
13352 -- appropriately, i.e. as an extended name for the global entity.
13354 elsif Nkind (Parent (N)) = N_Selected_Component
13355 and then Nkind (Parent (N2)) = N_Function_Call
13356 and then N = Selector_Name (Parent (N))
13358 if No (Parameter_Associations (Parent (N2))) then
13359 if Is_Global (Entity (Name (Parent (N2)))) then
13360 Change_Selected_Component_To_Expanded_Name (Parent (N));
13361 Set_Associated_Node (Parent (N), Name (Parent (N2)));
13362 Set_Global_Type (Parent (N), Name (Parent (N2)));
13363 Save_Entity_Descendants (N);
13366 Set_Is_Prefixed_Call (Parent (N));
13367 Set_Associated_Node (N, Empty);
13368 Set_Etype (N, Empty);
13371 -- In Ada 2005, X.F may be a call to a primitive operation,
13372 -- rewritten as F (X). This rewriting will be done again in an
13373 -- instance, so keep the original node. Global entities will be
13374 -- captured as for other constructs. Indicate that this must
13375 -- resolve as a call, to prevent accidental overloading in the
13376 -- instance, if both a component and a primitive operation appear
13380 Set_Is_Prefixed_Call (Parent (N));
13383 -- Entity is local. Reset in generic unit, so that node is resolved
13384 -- anew at the point of instantiation.
13387 Set_Associated_Node (N, Empty);
13388 Set_Etype (N, Empty);
13392 -----------------------------
13393 -- Save_Entity_Descendants --
13394 -----------------------------
13396 procedure Save_Entity_Descendants (N : Node_Id) is
13399 when N_Binary_Op =>
13400 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
13401 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13404 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
13406 when N_Expanded_Name | N_Selected_Component =>
13407 Save_Global_Descendant (Union_Id (Prefix (N)));
13408 Save_Global_Descendant (Union_Id (Selector_Name (N)));
13410 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
13414 raise Program_Error;
13416 end Save_Entity_Descendants;
13418 --------------------------
13419 -- Save_Global_Defaults --
13420 --------------------------
13422 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
13423 Loc : constant Source_Ptr := Sloc (N1);
13424 Assoc2 : constant List_Id := Generic_Associations (N2);
13425 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
13432 Actual : Entity_Id;
13435 Assoc1 := Generic_Associations (N1);
13437 if Present (Assoc1) then
13438 Act1 := First (Assoc1);
13441 Set_Generic_Associations (N1, New_List);
13442 Assoc1 := Generic_Associations (N1);
13445 if Present (Assoc2) then
13446 Act2 := First (Assoc2);
13451 while Present (Act1) and then Present (Act2) loop
13456 -- Find the associations added for default subprograms
13458 if Present (Act2) then
13459 while Nkind (Act2) /= N_Generic_Association
13460 or else No (Entity (Selector_Name (Act2)))
13461 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
13466 -- Add a similar association if the default is global. The
13467 -- renaming declaration for the actual has been analyzed, and
13468 -- its alias is the program it renames. Link the actual in the
13469 -- original generic tree with the node in the analyzed tree.
13471 while Present (Act2) loop
13472 Subp := Entity (Selector_Name (Act2));
13473 Def := Explicit_Generic_Actual_Parameter (Act2);
13475 -- Following test is defence against rubbish errors
13477 if No (Alias (Subp)) then
13481 -- Retrieve the resolved actual from the renaming declaration
13482 -- created for the instantiated formal.
13484 Actual := Entity (Name (Parent (Parent (Subp))));
13485 Set_Entity (Def, Actual);
13486 Set_Etype (Def, Etype (Actual));
13488 if Is_Global (Actual) then
13490 Make_Generic_Association (Loc,
13491 Selector_Name => New_Occurrence_Of (Subp, Loc),
13492 Explicit_Generic_Actual_Parameter =>
13493 New_Occurrence_Of (Actual, Loc));
13495 Set_Associated_Node
13496 (Explicit_Generic_Actual_Parameter (Ndec), Def);
13498 Append (Ndec, Assoc1);
13500 -- If there are other defaults, add a dummy association in case
13501 -- there are other defaulted formals with the same name.
13503 elsif Present (Next (Act2)) then
13505 Make_Generic_Association (Loc,
13506 Selector_Name => New_Occurrence_Of (Subp, Loc),
13507 Explicit_Generic_Actual_Parameter => Empty);
13509 Append (Ndec, Assoc1);
13516 if Nkind (Name (N1)) = N_Identifier
13517 and then Is_Child_Unit (Gen_Id)
13518 and then Is_Global (Gen_Id)
13519 and then Is_Generic_Unit (Scope (Gen_Id))
13520 and then In_Open_Scopes (Scope (Gen_Id))
13522 -- This is an instantiation of a child unit within a sibling, so
13523 -- that the generic parent is in scope. An eventual instance must
13524 -- occur within the scope of an instance of the parent. Make name
13525 -- in instance into an expanded name, to preserve the identifier
13526 -- of the parent, so it can be resolved subsequently.
13528 Rewrite (Name (N2),
13529 Make_Expanded_Name (Loc,
13530 Chars => Chars (Gen_Id),
13531 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13532 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13533 Set_Entity (Name (N2), Gen_Id);
13535 Rewrite (Name (N1),
13536 Make_Expanded_Name (Loc,
13537 Chars => Chars (Gen_Id),
13538 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13539 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13541 Set_Associated_Node (Name (N1), Name (N2));
13542 Set_Associated_Node (Prefix (Name (N1)), Empty);
13543 Set_Associated_Node
13544 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
13545 Set_Etype (Name (N1), Etype (Gen_Id));
13548 end Save_Global_Defaults;
13550 ----------------------------
13551 -- Save_Global_Descendant --
13552 ----------------------------
13554 procedure Save_Global_Descendant (D : Union_Id) is
13558 if D in Node_Range then
13559 if D = Union_Id (Empty) then
13562 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
13563 Save_References (Node_Id (D));
13566 elsif D in List_Range then
13567 if D = Union_Id (No_List)
13568 or else Is_Empty_List (List_Id (D))
13573 N1 := First (List_Id (D));
13574 while Present (N1) loop
13575 Save_References (N1);
13580 -- Element list or other non-node field, nothing to do
13585 end Save_Global_Descendant;
13587 ---------------------
13588 -- Save_References --
13589 ---------------------
13591 -- This is the recursive procedure that does the work once the enclosing
13592 -- generic scope has been established. We have to treat specially a
13593 -- number of node rewritings that are required by semantic processing
13594 -- and which change the kind of nodes in the generic copy: typically
13595 -- constant-folding, replacing an operator node by a string literal, or
13596 -- a selected component by an expanded name. In each of those cases, the
13597 -- transformation is propagated to the generic unit.
13599 procedure Save_References (N : Node_Id) is
13600 Loc : constant Source_Ptr := Sloc (N);
13606 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
13607 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13610 elsif Nkind (N) = N_Operator_Symbol
13611 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
13613 Change_Operator_Symbol_To_String_Literal (N);
13616 elsif Nkind (N) in N_Op then
13617 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13618 if Nkind (N) = N_Op_Concat then
13619 Set_Is_Component_Left_Opnd (N,
13620 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13622 Set_Is_Component_Right_Opnd (N,
13623 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13629 -- Node may be transformed into call to a user-defined operator
13631 N2 := Get_Associated_Node (N);
13633 if Nkind (N2) = N_Function_Call then
13634 E := Entity (Name (N2));
13637 and then Is_Global (E)
13639 Set_Etype (N, Etype (N2));
13641 Set_Associated_Node (N, Empty);
13642 Set_Etype (N, Empty);
13645 elsif Nkind_In (N2, N_Integer_Literal,
13649 if Present (Original_Node (N2))
13650 and then Nkind (Original_Node (N2)) = Nkind (N)
13653 -- Operation was constant-folded. Whenever possible,
13654 -- recover semantic information from unfolded node,
13657 Set_Associated_Node (N, Original_Node (N2));
13659 if Nkind (N) = N_Op_Concat then
13660 Set_Is_Component_Left_Opnd (N,
13661 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13662 Set_Is_Component_Right_Opnd (N,
13663 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13669 -- If original node is already modified, propagate
13670 -- constant-folding to template.
13672 Rewrite (N, New_Copy (N2));
13673 Set_Analyzed (N, False);
13676 elsif Nkind (N2) = N_Identifier
13677 and then Ekind (Entity (N2)) = E_Enumeration_Literal
13679 -- Same if call was folded into a literal, but in this case
13680 -- retain the entity to avoid spurious ambiguities if it is
13681 -- overloaded at the point of instantiation or inlining.
13683 Rewrite (N, New_Copy (N2));
13684 Set_Analyzed (N, False);
13688 -- Complete operands check if node has not been constant-folded
13690 if Nkind (N) in N_Op then
13691 Save_Entity_Descendants (N);
13694 elsif Nkind (N) = N_Identifier then
13695 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13697 -- If this is a discriminant reference, always save it. It is
13698 -- used in the instance to find the corresponding discriminant
13699 -- positionally rather than by name.
13701 Set_Original_Discriminant
13702 (N, Original_Discriminant (Get_Associated_Node (N)));
13706 N2 := Get_Associated_Node (N);
13708 if Nkind (N2) = N_Function_Call then
13709 E := Entity (Name (N2));
13711 -- Name resolves to a call to parameterless function. If
13712 -- original entity is global, mark node as resolved.
13715 and then Is_Global (E)
13717 Set_Etype (N, Etype (N2));
13719 Set_Associated_Node (N, Empty);
13720 Set_Etype (N, Empty);
13723 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
13724 and then Is_Entity_Name (Original_Node (N2))
13726 -- Name resolves to named number that is constant-folded,
13727 -- We must preserve the original name for ASIS use, and
13728 -- undo the constant-folding, which will be repeated in
13731 Set_Associated_Node (N, Original_Node (N2));
13734 elsif Nkind (N2) = N_String_Literal then
13736 -- Name resolves to string literal. Perform the same
13737 -- replacement in generic.
13739 Rewrite (N, New_Copy (N2));
13741 elsif Nkind (N2) = N_Explicit_Dereference then
13743 -- An identifier is rewritten as a dereference if it is the
13744 -- prefix in an implicit dereference (call or attribute).
13745 -- The analysis of an instantiation will expand the node
13746 -- again, so we preserve the original tree but link it to
13747 -- the resolved entity in case it is global.
13749 if Is_Entity_Name (Prefix (N2))
13750 and then Present (Entity (Prefix (N2)))
13751 and then Is_Global (Entity (Prefix (N2)))
13753 Set_Associated_Node (N, Prefix (N2));
13755 elsif Nkind (Prefix (N2)) = N_Function_Call
13756 and then Is_Global (Entity (Name (Prefix (N2))))
13759 Make_Explicit_Dereference (Loc,
13760 Prefix => Make_Function_Call (Loc,
13762 New_Occurrence_Of (Entity (Name (Prefix (N2))),
13766 Set_Associated_Node (N, Empty);
13767 Set_Etype (N, Empty);
13770 -- The subtype mark of a nominally unconstrained object is
13771 -- rewritten as a subtype indication using the bounds of the
13772 -- expression. Recover the original subtype mark.
13774 elsif Nkind (N2) = N_Subtype_Indication
13775 and then Is_Entity_Name (Original_Node (N2))
13777 Set_Associated_Node (N, Original_Node (N2));
13785 elsif Nkind (N) in N_Entity then
13790 Qual : Node_Id := Empty;
13791 Typ : Entity_Id := Empty;
13794 use Atree.Unchecked_Access;
13795 -- This code section is part of implementing an untyped tree
13796 -- traversal, so it needs direct access to node fields.
13799 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
13800 N2 := Get_Associated_Node (N);
13807 -- In an instance within a generic, use the name of the
13808 -- actual and not the original generic parameter. If the
13809 -- actual is global in the current generic it must be
13810 -- preserved for its instantiation.
13812 if Nkind (Parent (Typ)) = N_Subtype_Declaration
13814 Present (Generic_Parent_Type (Parent (Typ)))
13816 Typ := Base_Type (Typ);
13817 Set_Etype (N2, Typ);
13823 or else not Is_Global (Typ)
13825 Set_Associated_Node (N, Empty);
13827 -- If the aggregate is an actual in a call, it has been
13828 -- resolved in the current context, to some local type.
13829 -- The enclosing call may have been disambiguated by the
13830 -- aggregate, and this disambiguation might fail at
13831 -- instantiation time because the type to which the
13832 -- aggregate did resolve is not preserved. In order to
13833 -- preserve some of this information, we wrap the
13834 -- aggregate in a qualified expression, using the id of
13835 -- its type. For further disambiguation we qualify the
13836 -- type name with its scope (if visible) because both
13837 -- id's will have corresponding entities in an instance.
13838 -- This resolves most of the problems with missing type
13839 -- information on aggregates in instances.
13841 if Nkind (N2) = Nkind (N)
13842 and then Nkind (Parent (N2)) in N_Subprogram_Call
13843 and then Comes_From_Source (Typ)
13845 if Is_Immediately_Visible (Scope (Typ)) then
13846 Nam := Make_Selected_Component (Loc,
13848 Make_Identifier (Loc, Chars (Scope (Typ))),
13850 Make_Identifier (Loc, Chars (Typ)));
13852 Nam := Make_Identifier (Loc, Chars (Typ));
13856 Make_Qualified_Expression (Loc,
13857 Subtype_Mark => Nam,
13858 Expression => Relocate_Node (N));
13862 Save_Global_Descendant (Field1 (N));
13863 Save_Global_Descendant (Field2 (N));
13864 Save_Global_Descendant (Field3 (N));
13865 Save_Global_Descendant (Field5 (N));
13867 if Present (Qual) then
13871 -- All other cases than aggregates
13874 Save_Global_Descendant (Field1 (N));
13875 Save_Global_Descendant (Field2 (N));
13876 Save_Global_Descendant (Field3 (N));
13877 Save_Global_Descendant (Field4 (N));
13878 Save_Global_Descendant (Field5 (N));
13883 -- If a node has aspects, references within their expressions must
13884 -- be saved separately, given they are not directly in the tree.
13886 if Has_Aspects (N) then
13891 Aspect := First (Aspect_Specifications (N));
13892 while Present (Aspect) loop
13893 if Present (Expression (Aspect)) then
13894 Save_Global_References (Expression (Aspect));
13901 end Save_References;
13903 -- Start of processing for Save_Global_References
13906 Gen_Scope := Current_Scope;
13908 -- If the generic unit is a child unit, references to entities in the
13909 -- parent are treated as local, because they will be resolved anew in
13910 -- the context of the instance of the parent.
13912 while Is_Child_Unit (Gen_Scope)
13913 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
13915 Gen_Scope := Scope (Gen_Scope);
13918 Save_References (N);
13919 end Save_Global_References;
13921 --------------------------------------
13922 -- Set_Copied_Sloc_For_Inlined_Body --
13923 --------------------------------------
13925 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
13927 Create_Instantiation_Source (N, E, True, S_Adjustment);
13928 end Set_Copied_Sloc_For_Inlined_Body;
13930 ---------------------
13931 -- Set_Instance_Of --
13932 ---------------------
13934 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
13936 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
13937 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
13938 Generic_Renamings.Increment_Last;
13939 end Set_Instance_Of;
13941 --------------------
13942 -- Set_Next_Assoc --
13943 --------------------
13945 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
13947 Generic_Renamings.Table (E).Next_In_HTable := Next;
13948 end Set_Next_Assoc;
13950 -------------------
13951 -- Start_Generic --
13952 -------------------
13954 procedure Start_Generic is
13956 -- ??? More things could be factored out in this routine.
13957 -- Should probably be done at a later stage.
13959 Generic_Flags.Append (Inside_A_Generic);
13960 Inside_A_Generic := True;
13962 Expander_Mode_Save_And_Set (False);
13965 ----------------------
13966 -- Set_Instance_Env --
13967 ----------------------
13969 procedure Set_Instance_Env
13970 (Gen_Unit : Entity_Id;
13971 Act_Unit : Entity_Id)
13973 Assertion_Status : constant Boolean := Assertions_Enabled;
13974 Save_SPARK_Mode : constant SPARK_Mode_Type := SPARK_Mode;
13975 Save_SPARK_Mode_Pragma : constant Node_Id := SPARK_Mode_Pragma;
13978 -- Regardless of the current mode, predefined units are analyzed in the
13979 -- most current Ada mode, and earlier version Ada checks do not apply
13980 -- to predefined units. Nothing needs to be done for non-internal units.
13981 -- These are always analyzed in the current mode.
13983 if Is_Internal_File_Name
13984 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
13985 Renamings_Included => True)
13987 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
13989 -- In Ada2012 we may want to enable assertions in an instance of a
13990 -- predefined unit, in which case we need to preserve the current
13991 -- setting for the Assertions_Enabled flag. This will become more
13992 -- critical when pre/postconditions are added to predefined units,
13993 -- as is already the case for some numeric libraries.
13995 if Ada_Version >= Ada_2012 then
13996 Assertions_Enabled := Assertion_Status;
13999 -- SPARK_Mode for an instance is the one applicable at the point of
14002 SPARK_Mode := Save_SPARK_Mode;
14003 SPARK_Mode_Pragma := Save_SPARK_Mode_Pragma;
14006 Current_Instantiated_Parent :=
14007 (Gen_Id => Gen_Unit,
14008 Act_Id => Act_Unit,
14009 Next_In_HTable => Assoc_Null);
14010 end Set_Instance_Env;
14016 procedure Switch_View (T : Entity_Id) is
14017 BT : constant Entity_Id := Base_Type (T);
14018 Priv_Elmt : Elmt_Id := No_Elmt;
14019 Priv_Sub : Entity_Id;
14022 -- T may be private but its base type may have been exchanged through
14023 -- some other occurrence, in which case there is nothing to switch
14024 -- besides T itself. Note that a private dependent subtype of a private
14025 -- type might not have been switched even if the base type has been,
14026 -- because of the last branch of Check_Private_View (see comment there).
14028 if not Is_Private_Type (BT) then
14029 Prepend_Elmt (Full_View (T), Exchanged_Views);
14030 Exchange_Declarations (T);
14034 Priv_Elmt := First_Elmt (Private_Dependents (BT));
14036 if Present (Full_View (BT)) then
14037 Prepend_Elmt (Full_View (BT), Exchanged_Views);
14038 Exchange_Declarations (BT);
14041 while Present (Priv_Elmt) loop
14042 Priv_Sub := (Node (Priv_Elmt));
14044 -- We avoid flipping the subtype if the Etype of its full view is
14045 -- private because this would result in a malformed subtype. This
14046 -- occurs when the Etype of the subtype full view is the full view of
14047 -- the base type (and since the base types were just switched, the
14048 -- subtype is pointing to the wrong view). This is currently the case
14049 -- for tagged record types, access types (maybe more?) and needs to
14050 -- be resolved. ???
14052 if Present (Full_View (Priv_Sub))
14053 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
14055 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
14056 Exchange_Declarations (Priv_Sub);
14059 Next_Elmt (Priv_Elmt);
14067 function True_Parent (N : Node_Id) return Node_Id is
14069 if Nkind (Parent (N)) = N_Subunit then
14070 return Parent (Corresponding_Stub (Parent (N)));
14076 -----------------------------
14077 -- Valid_Default_Attribute --
14078 -----------------------------
14080 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
14081 Attr_Id : constant Attribute_Id :=
14082 Get_Attribute_Id (Attribute_Name (Def));
14083 T : constant Entity_Id := Entity (Prefix (Def));
14084 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
14097 F := First_Formal (Nam);
14098 while Present (F) loop
14099 Num_F := Num_F + 1;
14104 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
14105 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
14106 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
14107 Attribute_Unbiased_Rounding =>
14110 and then Is_Floating_Point_Type (T);
14112 when Attribute_Image | Attribute_Pred | Attribute_Succ |
14113 Attribute_Value | Attribute_Wide_Image |
14114 Attribute_Wide_Value =>
14115 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
14117 when Attribute_Max | Attribute_Min =>
14118 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
14120 when Attribute_Input =>
14121 OK := (Is_Fun and then Num_F = 1);
14123 when Attribute_Output | Attribute_Read | Attribute_Write =>
14124 OK := (not Is_Fun and then Num_F = 2);
14131 Error_Msg_N ("attribute reference has wrong profile for subprogram",
14134 end Valid_Default_Attribute;