1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Exp_Disp; use Exp_Disp;
33 with Fname; use Fname;
34 with Fname.UF; use Fname.UF;
35 with Freeze; use Freeze;
37 with Itypes; use Itypes;
39 with Lib.Load; use Lib.Load;
40 with Lib.Xref; use Lib.Xref;
41 with Nlists; use Nlists;
42 with Namet; use Namet;
43 with Nmake; use Nmake;
45 with Rident; use Rident;
46 with Restrict; use Restrict;
47 with Rtsfind; use Rtsfind;
49 with Sem_Aux; use Sem_Aux;
50 with Sem_Cat; use Sem_Cat;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch7; use Sem_Ch7;
54 with Sem_Ch8; use Sem_Ch8;
55 with Sem_Ch10; use Sem_Ch10;
56 with Sem_Ch13; use Sem_Ch13;
57 with Sem_Dim; use Sem_Dim;
58 with Sem_Disp; use Sem_Disp;
59 with Sem_Elab; use Sem_Elab;
60 with Sem_Elim; use Sem_Elim;
61 with Sem_Eval; use Sem_Eval;
62 with Sem_Res; use Sem_Res;
63 with Sem_Type; use Sem_Type;
64 with Sem_Util; use Sem_Util;
65 with Sem_Warn; use Sem_Warn;
66 with Stand; use Stand;
67 with Sinfo; use Sinfo;
68 with Sinfo.CN; use Sinfo.CN;
69 with Sinput; use Sinput;
70 with Sinput.L; use Sinput.L;
71 with Snames; use Snames;
72 with Stringt; use Stringt;
73 with Uname; use Uname;
75 with Tbuild; use Tbuild;
76 with Uintp; use Uintp;
77 with Urealp; use Urealp;
81 package body Sem_Ch12 is
83 ----------------------------------------------------------
84 -- Implementation of Generic Analysis and Instantiation --
85 ----------------------------------------------------------
87 -- GNAT implements generics by macro expansion. No attempt is made to share
88 -- generic instantiations (for now). Analysis of a generic definition does
89 -- not perform any expansion action, but the expander must be called on the
90 -- tree for each instantiation, because the expansion may of course depend
91 -- on the generic actuals. All of this is best achieved as follows:
93 -- a) Semantic analysis of a generic unit is performed on a copy of the
94 -- tree for the generic unit. All tree modifications that follow analysis
95 -- do not affect the original tree. Links are kept between the original
96 -- tree and the copy, in order to recognize non-local references within
97 -- the generic, and propagate them to each instance (recall that name
98 -- resolution is done on the generic declaration: generics are not really
99 -- macros!). This is summarized in the following diagram:
101 -- .-----------. .----------.
102 -- | semantic |<--------------| generic |
104 -- | |==============>| |
105 -- |___________| global |__________|
116 -- b) Each instantiation copies the original tree, and inserts into it a
117 -- series of declarations that describe the mapping between generic formals
118 -- and actuals. For example, a generic In OUT parameter is an object
119 -- renaming of the corresponding actual, etc. Generic IN parameters are
120 -- constant declarations.
122 -- c) In order to give the right visibility for these renamings, we use
123 -- a different scheme for package and subprogram instantiations. For
124 -- packages, the list of renamings is inserted into the package
125 -- specification, before the visible declarations of the package. The
126 -- renamings are analyzed before any of the text of the instance, and are
127 -- thus visible at the right place. Furthermore, outside of the instance,
128 -- the generic parameters are visible and denote their corresponding
131 -- For subprograms, we create a container package to hold the renamings
132 -- and the subprogram instance itself. Analysis of the package makes the
133 -- renaming declarations visible to the subprogram. After analyzing the
134 -- package, the defining entity for the subprogram is touched-up so that
135 -- it appears declared in the current scope, and not inside the container
138 -- If the instantiation is a compilation unit, the container package is
139 -- given the same name as the subprogram instance. This ensures that
140 -- the elaboration procedure called by the binder, using the compilation
141 -- unit name, calls in fact the elaboration procedure for the package.
143 -- Not surprisingly, private types complicate this approach. By saving in
144 -- the original generic object the non-local references, we guarantee that
145 -- the proper entities are referenced at the point of instantiation.
146 -- However, for private types, this by itself does not insure that the
147 -- proper VIEW of the entity is used (the full type may be visible at the
148 -- point of generic definition, but not at instantiation, or vice-versa).
149 -- In order to reference the proper view, we special-case any reference
150 -- to private types in the generic object, by saving both views, one in
151 -- the generic and one in the semantic copy. At time of instantiation, we
152 -- check whether the two views are consistent, and exchange declarations if
153 -- necessary, in order to restore the correct visibility. Similarly, if
154 -- the instance view is private when the generic view was not, we perform
155 -- the exchange. After completing the instantiation, we restore the
156 -- current visibility. The flag Has_Private_View marks identifiers in the
157 -- the generic unit that require checking.
159 -- Visibility within nested generic units requires special handling.
160 -- Consider the following scheme:
162 -- type Global is ... -- outside of generic unit.
166 -- type Semi_Global is ... -- global to inner.
169 -- procedure inner (X1 : Global; X2 : Semi_Global);
171 -- procedure in2 is new inner (...); -- 4
174 -- package New_Outer is new Outer (...); -- 2
175 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
177 -- The semantic analysis of Outer captures all occurrences of Global.
178 -- The semantic analysis of Inner (at 1) captures both occurrences of
179 -- Global and Semi_Global.
181 -- At point 2 (instantiation of Outer), we also produce a generic copy
182 -- of Inner, even though Inner is, at that point, not being instantiated.
183 -- (This is just part of the semantic analysis of New_Outer).
185 -- Critically, references to Global within Inner must be preserved, while
186 -- references to Semi_Global should not preserved, because they must now
187 -- resolve to an entity within New_Outer. To distinguish between these, we
188 -- use a global variable, Current_Instantiated_Parent, which is set when
189 -- performing a generic copy during instantiation (at 2). This variable is
190 -- used when performing a generic copy that is not an instantiation, but
191 -- that is nested within one, as the occurrence of 1 within 2. The analysis
192 -- of a nested generic only preserves references that are global to the
193 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
194 -- determine whether a reference is external to the given parent.
196 -- The instantiation at point 3 requires no special treatment. The method
197 -- works as well for further nestings of generic units, but of course the
198 -- variable Current_Instantiated_Parent must be stacked because nested
199 -- instantiations can occur, e.g. the occurrence of 4 within 2.
201 -- The instantiation of package and subprogram bodies is handled in a
202 -- similar manner, except that it is delayed until after semantic
203 -- analysis is complete. In this fashion complex cross-dependencies
204 -- between several package declarations and bodies containing generics
205 -- can be compiled which otherwise would diagnose spurious circularities.
207 -- For example, it is possible to compile two packages A and B that
208 -- have the following structure:
210 -- package A is package B is
211 -- generic ... generic ...
212 -- package G_A is package G_B is
215 -- package body A is package body B is
216 -- package N_B is new G_B (..) package N_A is new G_A (..)
218 -- The table Pending_Instantiations in package Inline is used to keep
219 -- track of body instantiations that are delayed in this manner. Inline
220 -- handles the actual calls to do the body instantiations. This activity
221 -- is part of Inline, since the processing occurs at the same point, and
222 -- for essentially the same reason, as the handling of inlined routines.
224 ----------------------------------------------
225 -- Detection of Instantiation Circularities --
226 ----------------------------------------------
228 -- If we have a chain of instantiations that is circular, this is static
229 -- error which must be detected at compile time. The detection of these
230 -- circularities is carried out at the point that we insert a generic
231 -- instance spec or body. If there is a circularity, then the analysis of
232 -- the offending spec or body will eventually result in trying to load the
233 -- same unit again, and we detect this problem as we analyze the package
234 -- instantiation for the second time.
236 -- At least in some cases after we have detected the circularity, we get
237 -- into trouble if we try to keep going. The following flag is set if a
238 -- circularity is detected, and used to abandon compilation after the
239 -- messages have been posted.
241 Circularity_Detected : Boolean := False;
242 -- This should really be reset on encountering a new main unit, but in
243 -- practice we are not using multiple main units so it is not critical.
245 -------------------------------------------------
246 -- Formal packages and partial parametrization --
247 -------------------------------------------------
249 -- When compiling a generic, a formal package is a local instantiation. If
250 -- declared with a box, its generic formals are visible in the enclosing
251 -- generic. If declared with a partial list of actuals, those actuals that
252 -- are defaulted (covered by an Others clause, or given an explicit box
253 -- initialization) are also visible in the enclosing generic, while those
254 -- that have a corresponding actual are not.
256 -- In our source model of instantiation, the same visibility must be
257 -- present in the spec and body of an instance: the names of the formals
258 -- that are defaulted must be made visible within the instance, and made
259 -- invisible (hidden) after the instantiation is complete, so that they
260 -- are not accessible outside of the instance.
262 -- In a generic, a formal package is treated like a special instantiation.
263 -- Our Ada 95 compiler handled formals with and without box in different
264 -- ways. With partial parametrization, we use a single model for both.
265 -- We create a package declaration that consists of the specification of
266 -- the generic package, and a set of declarations that map the actuals
267 -- into local renamings, just as we do for bona fide instantiations. For
268 -- defaulted parameters and formals with a box, we copy directly the
269 -- declarations of the formal into this local package. The result is a
270 -- a package whose visible declarations may include generic formals. This
271 -- package is only used for type checking and visibility analysis, and
272 -- never reaches the back-end, so it can freely violate the placement
273 -- rules for generic formal declarations.
275 -- The list of declarations (renamings and copies of formals) is built
276 -- by Analyze_Associations, just as for regular instantiations.
278 -- At the point of instantiation, conformance checking must be applied only
279 -- to those parameters that were specified in the formal. We perform this
280 -- checking by creating another internal instantiation, this one including
281 -- only the renamings and the formals (the rest of the package spec is not
282 -- relevant to conformance checking). We can then traverse two lists: the
283 -- list of actuals in the instance that corresponds to the formal package,
284 -- and the list of actuals produced for this bogus instantiation. We apply
285 -- the conformance rules to those actuals that are not defaulted (i.e.
286 -- which still appear as generic formals.
288 -- When we compile an instance body we must make the right parameters
289 -- visible again. The predicate Is_Generic_Formal indicates which of the
290 -- formals should have its Is_Hidden flag reset.
292 -----------------------
293 -- Local subprograms --
294 -----------------------
296 procedure Abandon_Instantiation (N : Node_Id);
297 pragma No_Return (Abandon_Instantiation);
298 -- Posts an error message "instantiation abandoned" at the indicated node
299 -- and then raises the exception Instantiation_Error to do it.
301 procedure Analyze_Formal_Array_Type
302 (T : in out Entity_Id;
304 -- A formal array type is treated like an array type declaration, and
305 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
306 -- in-out, because in the case of an anonymous type the entity is
307 -- actually created in the procedure.
309 -- The following procedures treat other kinds of formal parameters
311 procedure Analyze_Formal_Derived_Interface_Type
316 procedure Analyze_Formal_Derived_Type
321 procedure Analyze_Formal_Interface_Type
326 -- The following subprograms create abbreviated declarations for formal
327 -- scalar types. We introduce an anonymous base of the proper class for
328 -- each of them, and define the formals as constrained first subtypes of
329 -- their bases. The bounds are expressions that are non-static in the
332 procedure Analyze_Formal_Decimal_Fixed_Point_Type
333 (T : Entity_Id; Def : Node_Id);
334 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
335 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
337 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
338 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
339 (T : Entity_Id; Def : Node_Id);
341 procedure Analyze_Formal_Private_Type
345 -- Creates a new private type, which does not require completion
347 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id);
348 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
350 procedure Analyze_Generic_Formal_Part (N : Node_Id);
351 -- Analyze generic formal part
353 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
354 -- Create a new access type with the given designated type
356 function Analyze_Associations
359 F_Copy : List_Id) return List_Id;
360 -- At instantiation time, build the list of associations between formals
361 -- and actuals. Each association becomes a renaming declaration for the
362 -- formal entity. F_Copy is the analyzed list of formals in the generic
363 -- copy. It is used to apply legality checks to the actuals. I_Node is the
364 -- instantiation node itself.
366 procedure Analyze_Subprogram_Instantiation
370 procedure Build_Instance_Compilation_Unit_Nodes
374 -- This procedure is used in the case where the generic instance of a
375 -- subprogram body or package body is a library unit. In this case, the
376 -- original library unit node for the generic instantiation must be
377 -- replaced by the resulting generic body, and a link made to a new
378 -- compilation unit node for the generic declaration. The argument N is
379 -- the original generic instantiation. Act_Body and Act_Decl are the body
380 -- and declaration of the instance (either package body and declaration
381 -- nodes or subprogram body and declaration nodes depending on the case).
382 -- On return, the node N has been rewritten with the actual body.
384 procedure Check_Access_Definition (N : Node_Id);
385 -- Subsidiary routine to null exclusion processing. Perform an assertion
386 -- check on Ada version and the presence of an access definition in N.
388 procedure Check_Formal_Packages (P_Id : Entity_Id);
389 -- Apply the following to all formal packages in generic associations
391 procedure Check_Formal_Package_Instance
392 (Formal_Pack : Entity_Id;
393 Actual_Pack : Entity_Id);
394 -- Verify that the actuals of the actual instance match the actuals of
395 -- the template for a formal package that is not declared with a box.
397 procedure Check_Forward_Instantiation (Decl : Node_Id);
398 -- If the generic is a local entity and the corresponding body has not
399 -- been seen yet, flag enclosing packages to indicate that it will be
400 -- elaborated after the generic body. Subprograms declared in the same
401 -- package cannot be inlined by the front-end because front-end inlining
402 -- requires a strict linear order of elaboration.
404 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id;
405 -- Check if some association between formals and actuals requires to make
406 -- visible primitives of a tagged type, and make those primitives visible.
407 -- Return the list of primitives whose visibility is modified (to restore
408 -- their visibility later through Restore_Hidden_Primitives). If no
409 -- candidate is found then return No_Elist.
411 procedure Check_Hidden_Child_Unit
413 Gen_Unit : Entity_Id;
414 Act_Decl_Id : Entity_Id);
415 -- If the generic unit is an implicit child instance within a parent
416 -- instance, we need to make an explicit test that it is not hidden by
417 -- a child instance of the same name and parent.
419 procedure Check_Generic_Actuals
420 (Instance : Entity_Id;
421 Is_Formal_Box : Boolean);
422 -- Similar to previous one. Check the actuals in the instantiation,
423 -- whose views can change between the point of instantiation and the point
424 -- of instantiation of the body. In addition, mark the generic renamings
425 -- as generic actuals, so that they are not compatible with other actuals.
426 -- Recurse on an actual that is a formal package whose declaration has
429 function Contains_Instance_Of
432 N : Node_Id) return Boolean;
433 -- Inner is instantiated within the generic Outer. Check whether Inner
434 -- directly or indirectly contains an instance of Outer or of one of its
435 -- parents, in the case of a subunit. Each generic unit holds a list of
436 -- the entities instantiated within (at any depth). This procedure
437 -- determines whether the set of such lists contains a cycle, i.e. an
438 -- illegal circular instantiation.
440 function Denotes_Formal_Package
442 On_Exit : Boolean := False;
443 Instance : Entity_Id := Empty) return Boolean;
444 -- Returns True if E is a formal package of an enclosing generic, or
445 -- the actual for such a formal in an enclosing instantiation. If such
446 -- a package is used as a formal in an nested generic, or as an actual
447 -- in a nested instantiation, the visibility of ITS formals should not
448 -- be modified. When called from within Restore_Private_Views, the flag
449 -- On_Exit is true, to indicate that the search for a possible enclosing
450 -- instance should ignore the current one. In that case Instance denotes
451 -- the declaration for which this is an actual. This declaration may be
452 -- an instantiation in the source, or the internal instantiation that
453 -- corresponds to the actual for a formal package.
455 function Earlier (N1, N2 : Node_Id) return Boolean;
456 -- Yields True if N1 and N2 appear in the same compilation unit,
457 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
458 -- traversal of the tree for the unit. Used to determine the placement
459 -- of freeze nodes for instance bodies that may depend on other instances.
461 function Find_Actual_Type
463 Gen_Type : Entity_Id) return Entity_Id;
464 -- When validating the actual types of a child instance, check whether
465 -- the formal is a formal type of the parent unit, and retrieve the current
466 -- actual for it. Typ is the entity in the analyzed formal type declaration
467 -- (component or index type of an array type, or designated type of an
468 -- access formal) and Gen_Type is the enclosing analyzed formal array
469 -- or access type. The desired actual may be a formal of a parent, or may
470 -- be declared in a formal package of a parent. In both cases it is a
471 -- generic actual type because it appears within a visible instance.
472 -- Finally, it may be declared in a parent unit without being a formal
473 -- of that unit, in which case it must be retrieved by visibility.
474 -- Ambiguities may still arise if two homonyms are declared in two formal
475 -- packages, and the prefix of the formal type may be needed to resolve
476 -- the ambiguity in the instance ???
478 function In_Same_Declarative_Part
480 Inst : Node_Id) return Boolean;
481 -- True if the instantiation Inst and the given freeze_node F_Node appear
482 -- within the same declarative part, ignoring subunits, but with no inter-
483 -- vening subprograms or concurrent units. Used to find the proper plave
484 -- for the freeze node of an instance, when the generic is declared in a
485 -- previous instance. If predicate is true, the freeze node of the instance
486 -- can be placed after the freeze node of the previous instance, Otherwise
487 -- it has to be placed at the end of the current declarative part.
489 function In_Main_Context (E : Entity_Id) return Boolean;
490 -- Check whether an instantiation is in the context of the main unit.
491 -- Used to determine whether its body should be elaborated to allow
492 -- front-end inlining.
494 procedure Set_Instance_Env
495 (Gen_Unit : Entity_Id;
496 Act_Unit : Entity_Id);
497 -- Save current instance on saved environment, to be used to determine
498 -- the global status of entities in nested instances. Part of Save_Env.
499 -- called after verifying that the generic unit is legal for the instance,
500 -- The procedure also examines whether the generic unit is a predefined
501 -- unit, in order to set configuration switches accordingly. As a result
502 -- the procedure must be called after analyzing and freezing the actuals.
504 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
505 -- Associate analyzed generic parameter with corresponding
506 -- instance. Used for semantic checks at instantiation time.
508 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
509 -- Traverse the Exchanged_Views list to see if a type was private
510 -- and has already been flipped during this phase of instantiation.
512 procedure Hide_Current_Scope;
513 -- When instantiating a generic child unit, the parent context must be
514 -- present, but the instance and all entities that may be generated
515 -- must be inserted in the current scope. We leave the current scope
516 -- on the stack, but make its entities invisible to avoid visibility
517 -- problems. This is reversed at the end of the instantiation. This is
518 -- not done for the instantiation of the bodies, which only require the
519 -- instances of the generic parents to be in scope.
521 procedure Install_Body
526 -- If the instantiation happens textually before the body of the generic,
527 -- the instantiation of the body must be analyzed after the generic body,
528 -- and not at the point of instantiation. Such early instantiations can
529 -- happen if the generic and the instance appear in a package declaration
530 -- because the generic body can only appear in the corresponding package
531 -- body. Early instantiations can also appear if generic, instance and
532 -- body are all in the declarative part of a subprogram or entry. Entities
533 -- of packages that are early instantiations are delayed, and their freeze
534 -- node appears after the generic body.
536 procedure Insert_Freeze_Node_For_Instance
539 -- N denotes a package or a subprogram instantiation and F_Node is the
540 -- associated freeze node. Insert the freeze node before the first source
541 -- body which follows immediately after N. If no such body is found, the
542 -- freeze node is inserted at the end of the declarative region which
545 procedure Freeze_Subprogram_Body
546 (Inst_Node : Node_Id;
548 Pack_Id : Entity_Id);
549 -- The generic body may appear textually after the instance, including
550 -- in the proper body of a stub, or within a different package instance.
551 -- Given that the instance can only be elaborated after the generic, we
552 -- place freeze_nodes for the instance and/or for packages that may enclose
553 -- the instance and the generic, so that the back-end can establish the
554 -- proper order of elaboration.
557 -- Establish environment for subsequent instantiation. Separated from
558 -- Save_Env because data-structures for visibility handling must be
559 -- initialized before call to Check_Generic_Child_Unit.
561 procedure Install_Formal_Packages (Par : Entity_Id);
562 -- Install the visible part of any formal of the parent that is a formal
563 -- package. Note that for the case of a formal package with a box, this
564 -- includes the formal part of the formal package (12.7(10/2)).
566 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
567 -- When compiling an instance of a child unit the parent (which is
568 -- itself an instance) is an enclosing scope that must be made
569 -- immediately visible. This procedure is also used to install the non-
570 -- generic parent of a generic child unit when compiling its body, so
571 -- that full views of types in the parent are made visible.
573 procedure Remove_Parent (In_Body : Boolean := False);
574 -- Reverse effect after instantiation of child is complete
576 procedure Install_Hidden_Primitives
577 (Prims_List : in out Elist_Id;
580 -- Remove suffix 'P' from hidden primitives of Act_T to match the
581 -- visibility of primitives of Gen_T. The list of primitives to which
582 -- the suffix is removed is added to Prims_List to restore them later.
584 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id);
585 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
588 procedure Inline_Instance_Body
590 Gen_Unit : Entity_Id;
592 -- If front-end inlining is requested, instantiate the package body,
593 -- and preserve the visibility of its compilation unit, to insure
594 -- that successive instantiations succeed.
596 -- The functions Instantiate_XXX perform various legality checks and build
597 -- the declarations for instantiated generic parameters. In all of these
598 -- Formal is the entity in the generic unit, Actual is the entity of
599 -- expression in the generic associations, and Analyzed_Formal is the
600 -- formal in the generic copy, which contains the semantic information to
601 -- be used to validate the actual.
603 function Instantiate_Object
606 Analyzed_Formal : Node_Id) return List_Id;
608 function Instantiate_Type
611 Analyzed_Formal : Node_Id;
612 Actual_Decls : List_Id) return List_Id;
614 function Instantiate_Formal_Subprogram
617 Analyzed_Formal : Node_Id) return Node_Id;
619 function Instantiate_Formal_Package
622 Analyzed_Formal : Node_Id) return List_Id;
623 -- If the formal package is declared with a box, special visibility rules
624 -- apply to its formals: they are in the visible part of the package. This
625 -- is true in the declarative region of the formal package, that is to say
626 -- in the enclosing generic or instantiation. For an instantiation, the
627 -- parameters of the formal package are made visible in an explicit step.
628 -- Furthermore, if the actual has a visible USE clause, these formals must
629 -- be made potentially use-visible as well. On exit from the enclosing
630 -- instantiation, the reverse must be done.
632 -- For a formal package declared without a box, there are conformance rules
633 -- that apply to the actuals in the generic declaration and the actuals of
634 -- the actual package in the enclosing instantiation. The simplest way to
635 -- apply these rules is to repeat the instantiation of the formal package
636 -- in the context of the enclosing instance, and compare the generic
637 -- associations of this instantiation with those of the actual package.
638 -- This internal instantiation only needs to contain the renamings of the
639 -- formals: the visible and private declarations themselves need not be
642 -- In Ada 2005, the formal package may be only partially parameterized.
643 -- In that case the visibility step must make visible those actuals whose
644 -- corresponding formals were given with a box. A final complication
645 -- involves inherited operations from formal derived types, which must
646 -- be visible if the type is.
648 function Is_In_Main_Unit (N : Node_Id) return Boolean;
649 -- Test if given node is in the main unit
651 procedure Load_Parent_Of_Generic
654 Body_Optional : Boolean := False);
655 -- If the generic appears in a separate non-generic library unit, load the
656 -- corresponding body to retrieve the body of the generic. N is the node
657 -- for the generic instantiation, Spec is the generic package declaration.
659 -- Body_Optional is a flag that indicates that the body is being loaded to
660 -- ensure that temporaries are generated consistently when there are other
661 -- instances in the current declarative part that precede the one being
662 -- loaded. In that case a missing body is acceptable.
664 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
665 -- Add the context clause of the unit containing a generic unit to a
666 -- compilation unit that is, or contains, an instantiation.
668 function Get_Associated_Node (N : Node_Id) return Node_Id;
669 -- In order to propagate semantic information back from the analyzed copy
670 -- to the original generic, we maintain links between selected nodes in the
671 -- generic and their corresponding copies. At the end of generic analysis,
672 -- the routine Save_Global_References traverses the generic tree, examines
673 -- the semantic information, and preserves the links to those nodes that
674 -- contain global information. At instantiation, the information from the
675 -- associated node is placed on the new copy, so that name resolution is
678 -- Three kinds of source nodes have associated nodes:
680 -- a) those that can reference (denote) entities, that is identifiers,
681 -- character literals, expanded_names, operator symbols, operators,
682 -- and attribute reference nodes. These nodes have an Entity field
683 -- and are the set of nodes that are in N_Has_Entity.
685 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
687 -- c) selected components (N_Selected_Component)
689 -- For the first class, the associated node preserves the entity if it is
690 -- global. If the generic contains nested instantiations, the associated
691 -- node itself has been recopied, and a chain of them must be followed.
693 -- For aggregates, the associated node allows retrieval of the type, which
694 -- may otherwise not appear in the generic. The view of this type may be
695 -- different between generic and instantiation, and the full view can be
696 -- installed before the instantiation is analyzed. For aggregates of type
697 -- extensions, the same view exchange may have to be performed for some of
698 -- the ancestor types, if their view is private at the point of
701 -- Nodes that are selected components in the parse tree may be rewritten
702 -- as expanded names after resolution, and must be treated as potential
703 -- entity holders, which is why they also have an Associated_Node.
705 -- Nodes that do not come from source, such as freeze nodes, do not appear
706 -- in the generic tree, and need not have an associated node.
708 -- The associated node is stored in the Associated_Node field. Note that
709 -- this field overlaps Entity, which is fine, because the whole point is
710 -- that we don't need or want the normal Entity field in this situation.
712 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
713 -- Within the generic part, entities in the formal package are
714 -- visible. To validate subsequent type declarations, indicate
715 -- the correspondence between the entities in the analyzed formal,
716 -- and the entities in the actual package. There are three packages
717 -- involved in the instantiation of a formal package: the parent
718 -- generic P1 which appears in the generic declaration, the fake
719 -- instantiation P2 which appears in the analyzed generic, and whose
720 -- visible entities may be used in subsequent formals, and the actual
721 -- P3 in the instance. To validate subsequent formals, me indicate
722 -- that the entities in P2 are mapped into those of P3. The mapping of
723 -- entities has to be done recursively for nested packages.
725 procedure Move_Freeze_Nodes
729 -- Freeze nodes can be generated in the analysis of a generic unit, but
730 -- will not be seen by the back-end. It is necessary to move those nodes
731 -- to the enclosing scope if they freeze an outer entity. We place them
732 -- at the end of the enclosing generic package, which is semantically
735 procedure Preanalyze_Actuals (N : Node_Id);
736 -- Analyze actuals to perform name resolution. Full resolution is done
737 -- later, when the expected types are known, but names have to be captured
738 -- before installing parents of generics, that are not visible for the
739 -- actuals themselves.
741 function True_Parent (N : Node_Id) return Node_Id;
742 -- For a subunit, return parent of corresponding stub, else return
745 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
746 -- Verify that an attribute that appears as the default for a formal
747 -- subprogram is a function or procedure with the correct profile.
749 -------------------------------------------
750 -- Data Structures for Generic Renamings --
751 -------------------------------------------
753 -- The map Generic_Renamings associates generic entities with their
754 -- corresponding actuals. Currently used to validate type instances. It
755 -- will eventually be used for all generic parameters to eliminate the
756 -- need for overload resolution in the instance.
758 type Assoc_Ptr is new Int;
760 Assoc_Null : constant Assoc_Ptr := -1;
765 Next_In_HTable : Assoc_Ptr;
768 package Generic_Renamings is new Table.Table
769 (Table_Component_Type => Assoc,
770 Table_Index_Type => Assoc_Ptr,
771 Table_Low_Bound => 0,
773 Table_Increment => 100,
774 Table_Name => "Generic_Renamings");
776 -- Variable to hold enclosing instantiation. When the environment is
777 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
779 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
781 -- Hash table for associations
783 HTable_Size : constant := 37;
784 type HTable_Range is range 0 .. HTable_Size - 1;
786 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
787 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
788 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
789 function Hash (F : Entity_Id) return HTable_Range;
791 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
792 Header_Num => HTable_Range,
794 Elmt_Ptr => Assoc_Ptr,
795 Null_Ptr => Assoc_Null,
796 Set_Next => Set_Next_Assoc,
799 Get_Key => Get_Gen_Id,
803 Exchanged_Views : Elist_Id;
804 -- This list holds the private views that have been exchanged during
805 -- instantiation to restore the visibility of the generic declaration.
806 -- (see comments above). After instantiation, the current visibility is
807 -- reestablished by means of a traversal of this list.
809 Hidden_Entities : Elist_Id;
810 -- This list holds the entities of the current scope that are removed
811 -- from immediate visibility when instantiating a child unit. Their
812 -- visibility is restored in Remove_Parent.
814 -- Because instantiations can be recursive, the following must be saved
815 -- on entry and restored on exit from an instantiation (spec or body).
816 -- This is done by the two procedures Save_Env and Restore_Env. For
817 -- package and subprogram instantiations (but not for the body instances)
818 -- the action of Save_Env is done in two steps: Init_Env is called before
819 -- Check_Generic_Child_Unit, because setting the parent instances requires
820 -- that the visibility data structures be properly initialized. Once the
821 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
823 Parent_Unit_Visible : Boolean := False;
824 -- Parent_Unit_Visible is used when the generic is a child unit, and
825 -- indicates whether the ultimate parent of the generic is visible in the
826 -- instantiation environment. It is used to reset the visibility of the
827 -- parent at the end of the instantiation (see Remove_Parent).
829 Instance_Parent_Unit : Entity_Id := Empty;
830 -- This records the ultimate parent unit of an instance of a generic
831 -- child unit and is used in conjunction with Parent_Unit_Visible to
832 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
834 type Instance_Env is record
835 Instantiated_Parent : Assoc;
836 Exchanged_Views : Elist_Id;
837 Hidden_Entities : Elist_Id;
838 Current_Sem_Unit : Unit_Number_Type;
839 Parent_Unit_Visible : Boolean := False;
840 Instance_Parent_Unit : Entity_Id := Empty;
841 Switches : Config_Switches_Type;
844 package Instance_Envs is new Table.Table (
845 Table_Component_Type => Instance_Env,
846 Table_Index_Type => Int,
847 Table_Low_Bound => 0,
849 Table_Increment => 100,
850 Table_Name => "Instance_Envs");
852 procedure Restore_Private_Views
853 (Pack_Id : Entity_Id;
854 Is_Package : Boolean := True);
855 -- Restore the private views of external types, and unmark the generic
856 -- renamings of actuals, so that they become compatible subtypes again.
857 -- For subprograms, Pack_Id is the package constructed to hold the
860 procedure Switch_View (T : Entity_Id);
861 -- Switch the partial and full views of a type and its private
862 -- dependents (i.e. its subtypes and derived types).
864 ------------------------------------
865 -- Structures for Error Reporting --
866 ------------------------------------
868 Instantiation_Node : Node_Id;
869 -- Used by subprograms that validate instantiation of formal parameters
870 -- where there might be no actual on which to place the error message.
871 -- Also used to locate the instantiation node for generic subunits.
873 Instantiation_Error : exception;
874 -- When there is a semantic error in the generic parameter matching,
875 -- there is no point in continuing the instantiation, because the
876 -- number of cascaded errors is unpredictable. This exception aborts
877 -- the instantiation process altogether.
879 S_Adjustment : Sloc_Adjustment;
880 -- Offset created for each node in an instantiation, in order to keep
881 -- track of the source position of the instantiation in each of its nodes.
882 -- A subsequent semantic error or warning on a construct of the instance
883 -- points to both places: the original generic node, and the point of
884 -- instantiation. See Sinput and Sinput.L for additional details.
886 ------------------------------------------------------------
887 -- Data structure for keeping track when inside a Generic --
888 ------------------------------------------------------------
890 -- The following table is used to save values of the Inside_A_Generic
891 -- flag (see spec of Sem) when they are saved by Start_Generic.
893 package Generic_Flags is new Table.Table (
894 Table_Component_Type => Boolean,
895 Table_Index_Type => Int,
896 Table_Low_Bound => 0,
898 Table_Increment => 200,
899 Table_Name => "Generic_Flags");
901 ---------------------------
902 -- Abandon_Instantiation --
903 ---------------------------
905 procedure Abandon_Instantiation (N : Node_Id) is
907 Error_Msg_N ("\instantiation abandoned!", N);
908 raise Instantiation_Error;
909 end Abandon_Instantiation;
911 --------------------------
912 -- Analyze_Associations --
913 --------------------------
915 function Analyze_Associations
918 F_Copy : List_Id) return List_Id
920 Actuals_To_Freeze : constant Elist_Id := New_Elmt_List;
921 Assoc : constant List_Id := New_List;
922 Default_Actuals : constant Elist_Id := New_Elmt_List;
923 Gen_Unit : constant Entity_Id :=
924 Defining_Entity (Parent (F_Copy));
928 Analyzed_Formal : Node_Id;
929 First_Named : Node_Id := Empty;
933 Saved_Formal : Node_Id;
935 Default_Formals : constant List_Id := New_List;
936 -- If an Others_Choice is present, some of the formals may be defaulted.
937 -- To simplify the treatment of visibility in an instance, we introduce
938 -- individual defaults for each such formal. These defaults are
939 -- appended to the list of associations and replace the Others_Choice.
941 Found_Assoc : Node_Id;
942 -- Association for the current formal being match. Empty if there are
943 -- no remaining actuals, or if there is no named association with the
944 -- name of the formal.
946 Is_Named_Assoc : Boolean;
947 Num_Matched : Int := 0;
948 Num_Actuals : Int := 0;
950 Others_Present : Boolean := False;
951 Others_Choice : Node_Id := Empty;
952 -- In Ada 2005, indicates partial parametrization of a formal
953 -- package. As usual an other association must be last in the list.
955 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id);
956 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
957 -- cannot have a named association for it. AI05-0025 extends this rule
958 -- to formals of formal packages by AI05-0025, and it also applies to
959 -- box-initialized formals.
961 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean;
962 -- Determine whether the parameter types and the return type of Subp
963 -- are fully defined at the point of instantiation.
965 function Matching_Actual
967 A_F : Entity_Id) return Node_Id;
968 -- Find actual that corresponds to a given a formal parameter. If the
969 -- actuals are positional, return the next one, if any. If the actuals
970 -- are named, scan the parameter associations to find the right one.
971 -- A_F is the corresponding entity in the analyzed generic,which is
972 -- placed on the selector name for ASIS use.
974 -- In Ada 2005, a named association may be given with a box, in which
975 -- case Matching_Actual sets Found_Assoc to the generic association,
976 -- but return Empty for the actual itself. In this case the code below
977 -- creates a corresponding declaration for the formal.
979 function Partial_Parametrization return Boolean;
980 -- Ada 2005: if no match is found for a given formal, check if the
981 -- association for it includes a box, or whether the associations
982 -- include an Others clause.
984 procedure Process_Default (F : Entity_Id);
985 -- Add a copy of the declaration of generic formal F to the list of
986 -- associations, and add an explicit box association for F if there
987 -- is none yet, and the default comes from an Others_Choice.
989 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean;
990 -- Determine whether Subp renames one of the subprograms defined in the
991 -- generated package Standard.
993 procedure Set_Analyzed_Formal;
994 -- Find the node in the generic copy that corresponds to a given formal.
995 -- The semantic information on this node is used to perform legality
996 -- checks on the actuals. Because semantic analysis can introduce some
997 -- anonymous entities or modify the declaration node itself, the
998 -- correspondence between the two lists is not one-one. In addition to
999 -- anonymous types, the presence a formal equality will introduce an
1000 -- implicit declaration for the corresponding inequality.
1002 ----------------------------------------
1003 -- Check_Overloaded_Formal_Subprogram --
1004 ----------------------------------------
1006 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is
1007 Temp_Formal : Entity_Id;
1010 Temp_Formal := First (Formals);
1011 while Present (Temp_Formal) loop
1012 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration
1013 and then Temp_Formal /= Formal
1015 Chars (Defining_Unit_Name (Specification (Formal))) =
1016 Chars (Defining_Unit_Name (Specification (Temp_Formal)))
1018 if Present (Found_Assoc) then
1020 ("named association not allowed for overloaded formal",
1025 ("named association not allowed for overloaded formal",
1029 Abandon_Instantiation (Instantiation_Node);
1034 end Check_Overloaded_Formal_Subprogram;
1036 -------------------------------
1037 -- Has_Fully_Defined_Profile --
1038 -------------------------------
1040 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean is
1041 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean;
1042 -- Determine whethet type Typ is fully defined
1044 ---------------------------
1045 -- Is_Fully_Defined_Type --
1046 ---------------------------
1048 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean is
1050 -- A private type without a full view is not fully defined
1052 if Is_Private_Type (Typ)
1053 and then No (Full_View (Typ))
1057 -- An incomplete type is never fully defined
1059 elsif Is_Incomplete_Type (Typ) then
1062 -- All other types are fully defined
1067 end Is_Fully_Defined_Type;
1069 -- Local declarations
1073 -- Start of processing for Has_Fully_Defined_Profile
1076 -- Check the parameters
1078 Param := First_Formal (Subp);
1079 while Present (Param) loop
1080 if not Is_Fully_Defined_Type (Etype (Param)) then
1084 Next_Formal (Param);
1087 -- Check the return type
1089 return Is_Fully_Defined_Type (Etype (Subp));
1090 end Has_Fully_Defined_Profile;
1092 ---------------------
1093 -- Matching_Actual --
1094 ---------------------
1096 function Matching_Actual
1098 A_F : Entity_Id) return Node_Id
1104 Is_Named_Assoc := False;
1106 -- End of list of purely positional parameters
1108 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
1109 Found_Assoc := Empty;
1112 -- Case of positional parameter corresponding to current formal
1114 elsif No (Selector_Name (Actual)) then
1115 Found_Assoc := Actual;
1116 Act := Explicit_Generic_Actual_Parameter (Actual);
1117 Num_Matched := Num_Matched + 1;
1120 -- Otherwise scan list of named actuals to find the one with the
1121 -- desired name. All remaining actuals have explicit names.
1124 Is_Named_Assoc := True;
1125 Found_Assoc := Empty;
1129 while Present (Actual) loop
1130 if Chars (Selector_Name (Actual)) = Chars (F) then
1131 Set_Entity (Selector_Name (Actual), A_F);
1132 Set_Etype (Selector_Name (Actual), Etype (A_F));
1133 Generate_Reference (A_F, Selector_Name (Actual));
1134 Found_Assoc := Actual;
1135 Act := Explicit_Generic_Actual_Parameter (Actual);
1136 Num_Matched := Num_Matched + 1;
1144 -- Reset for subsequent searches. In most cases the named
1145 -- associations are in order. If they are not, we reorder them
1146 -- to avoid scanning twice the same actual. This is not just a
1147 -- question of efficiency: there may be multiple defaults with
1148 -- boxes that have the same name. In a nested instantiation we
1149 -- insert actuals for those defaults, and cannot rely on their
1150 -- names to disambiguate them.
1152 if Actual = First_Named then
1155 elsif Present (Actual) then
1156 Insert_Before (First_Named, Remove_Next (Prev));
1159 Actual := First_Named;
1162 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1163 Set_Used_As_Generic_Actual (Entity (Act));
1167 end Matching_Actual;
1169 -----------------------------
1170 -- Partial_Parametrization --
1171 -----------------------------
1173 function Partial_Parametrization return Boolean is
1175 return Others_Present
1176 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1177 end Partial_Parametrization;
1179 ---------------------
1180 -- Process_Default --
1181 ---------------------
1183 procedure Process_Default (F : Entity_Id) is
1184 Loc : constant Source_Ptr := Sloc (I_Node);
1185 F_Id : constant Entity_Id := Defining_Entity (F);
1191 -- Append copy of formal declaration to associations, and create new
1192 -- defining identifier for it.
1194 Decl := New_Copy_Tree (F);
1195 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id));
1197 if Nkind (F) in N_Formal_Subprogram_Declaration then
1198 Set_Defining_Unit_Name (Specification (Decl), Id);
1201 Set_Defining_Identifier (Decl, Id);
1204 Append (Decl, Assoc);
1206 if No (Found_Assoc) then
1208 Make_Generic_Association (Loc,
1209 Selector_Name => New_Occurrence_Of (Id, Loc),
1210 Explicit_Generic_Actual_Parameter => Empty);
1211 Set_Box_Present (Default);
1212 Append (Default, Default_Formals);
1214 end Process_Default;
1216 ---------------------------------
1217 -- Renames_Standard_Subprogram --
1218 ---------------------------------
1220 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean is
1225 while Present (Id) loop
1226 if Scope (Id) = Standard_Standard then
1234 end Renames_Standard_Subprogram;
1236 -------------------------
1237 -- Set_Analyzed_Formal --
1238 -------------------------
1240 procedure Set_Analyzed_Formal is
1244 while Present (Analyzed_Formal) loop
1245 Kind := Nkind (Analyzed_Formal);
1247 case Nkind (Formal) is
1249 when N_Formal_Subprogram_Declaration =>
1250 exit when Kind in N_Formal_Subprogram_Declaration
1253 (Defining_Unit_Name (Specification (Formal))) =
1255 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1257 when N_Formal_Package_Declaration =>
1258 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1259 N_Generic_Package_Declaration,
1260 N_Package_Declaration);
1262 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1266 -- Skip freeze nodes, and nodes inserted to replace
1267 -- unrecognized pragmas.
1270 Kind not in N_Formal_Subprogram_Declaration
1271 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1275 and then Chars (Defining_Identifier (Formal)) =
1276 Chars (Defining_Identifier (Analyzed_Formal));
1279 Next (Analyzed_Formal);
1281 end Set_Analyzed_Formal;
1283 -- Start of processing for Analyze_Associations
1286 Actuals := Generic_Associations (I_Node);
1288 if Present (Actuals) then
1290 -- Check for an Others choice, indicating a partial parametrization
1291 -- for a formal package.
1293 Actual := First (Actuals);
1294 while Present (Actual) loop
1295 if Nkind (Actual) = N_Others_Choice then
1296 Others_Present := True;
1297 Others_Choice := Actual;
1299 if Present (Next (Actual)) then
1300 Error_Msg_N ("others must be last association", Actual);
1303 -- This subprogram is used both for formal packages and for
1304 -- instantiations. For the latter, associations must all be
1307 if Nkind (I_Node) /= N_Formal_Package_Declaration
1308 and then Comes_From_Source (I_Node)
1311 ("others association not allowed in an instance",
1315 -- In any case, nothing to do after the others association
1319 elsif Box_Present (Actual)
1320 and then Comes_From_Source (I_Node)
1321 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1324 ("box association not allowed in an instance", Actual);
1330 -- If named associations are present, save first named association
1331 -- (it may of course be Empty) to facilitate subsequent name search.
1333 First_Named := First (Actuals);
1334 while Present (First_Named)
1335 and then Nkind (First_Named) /= N_Others_Choice
1336 and then No (Selector_Name (First_Named))
1338 Num_Actuals := Num_Actuals + 1;
1343 Named := First_Named;
1344 while Present (Named) loop
1345 if Nkind (Named) /= N_Others_Choice
1346 and then No (Selector_Name (Named))
1348 Error_Msg_N ("invalid positional actual after named one", Named);
1349 Abandon_Instantiation (Named);
1352 -- A named association may lack an actual parameter, if it was
1353 -- introduced for a default subprogram that turns out to be local
1354 -- to the outer instantiation.
1356 if Nkind (Named) /= N_Others_Choice
1357 and then Present (Explicit_Generic_Actual_Parameter (Named))
1359 Num_Actuals := Num_Actuals + 1;
1365 if Present (Formals) then
1366 Formal := First_Non_Pragma (Formals);
1367 Analyzed_Formal := First_Non_Pragma (F_Copy);
1369 if Present (Actuals) then
1370 Actual := First (Actuals);
1372 -- All formals should have default values
1378 while Present (Formal) loop
1379 Set_Analyzed_Formal;
1380 Saved_Formal := Next_Non_Pragma (Formal);
1382 case Nkind (Formal) is
1383 when N_Formal_Object_Declaration =>
1386 Defining_Identifier (Formal),
1387 Defining_Identifier (Analyzed_Formal));
1389 if No (Match) and then Partial_Parametrization then
1390 Process_Default (Formal);
1393 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1397 when N_Formal_Type_Declaration =>
1400 Defining_Identifier (Formal),
1401 Defining_Identifier (Analyzed_Formal));
1404 if Partial_Parametrization then
1405 Process_Default (Formal);
1408 Error_Msg_Sloc := Sloc (Gen_Unit);
1412 Defining_Identifier (Formal));
1413 Error_Msg_NE ("\in instantiation of & declared#",
1414 Instantiation_Node, Gen_Unit);
1415 Abandon_Instantiation (Instantiation_Node);
1422 (Formal, Match, Analyzed_Formal, Assoc),
1425 -- An instantiation is a freeze point for the actuals,
1426 -- unless this is a rewritten formal package, or the
1427 -- formal is an Ada 2012 formal incomplete type.
1429 if Nkind (I_Node) = N_Formal_Package_Declaration
1431 (Ada_Version >= Ada_2012
1433 Ekind (Defining_Identifier (Analyzed_Formal)) =
1439 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1443 -- A remote access-to-class-wide type is not a legal actual
1444 -- for a generic formal of an access type (E.2.2(17)).
1446 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1448 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1449 N_Access_To_Object_Definition
1451 Validate_Remote_Access_To_Class_Wide_Type (Match);
1454 when N_Formal_Subprogram_Declaration =>
1457 (Defining_Unit_Name (Specification (Formal)),
1458 Defining_Unit_Name (Specification (Analyzed_Formal)));
1460 -- If the formal subprogram has the same name as another
1461 -- formal subprogram of the generic, then a named
1462 -- association is illegal (12.3(9)). Exclude named
1463 -- associations that are generated for a nested instance.
1466 and then Is_Named_Assoc
1467 and then Comes_From_Source (Found_Assoc)
1469 Check_Overloaded_Formal_Subprogram (Formal);
1472 -- If there is no corresponding actual, this may be case of
1473 -- partial parametrization, or else the formal has a default
1476 if No (Match) and then Partial_Parametrization then
1477 Process_Default (Formal);
1479 if Nkind (I_Node) = N_Formal_Package_Declaration then
1480 Check_Overloaded_Formal_Subprogram (Formal);
1485 Instantiate_Formal_Subprogram
1486 (Formal, Match, Analyzed_Formal));
1488 -- An instantiation is a freeze point for the actuals,
1489 -- unless this is a rewritten formal package.
1491 if Nkind (I_Node) /= N_Formal_Package_Declaration
1492 and then Nkind (Match) = N_Identifier
1493 and then Is_Subprogram (Entity (Match))
1495 -- The actual subprogram may rename a routine defined
1496 -- in Standard. Avoid freezing such renamings because
1497 -- subprograms coming from Standard cannot be frozen.
1500 not Renames_Standard_Subprogram (Entity (Match))
1502 -- If the actual subprogram comes from a different
1503 -- unit, it is already frozen, either by a body in
1504 -- that unit or by the end of the declarative part
1505 -- of the unit. This check avoids the freezing of
1506 -- subprograms defined in Standard which are used
1507 -- as generic actuals.
1509 and then In_Same_Code_Unit (Entity (Match), I_Node)
1510 and then Has_Fully_Defined_Profile (Entity (Match))
1512 -- Mark the subprogram as having a delayed freeze
1513 -- since this may be an out-of-order action.
1515 Set_Has_Delayed_Freeze (Entity (Match));
1516 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1520 -- If this is a nested generic, preserve default for later
1524 and then Box_Present (Formal)
1527 (Defining_Unit_Name (Specification (Last (Assoc))),
1531 when N_Formal_Package_Declaration =>
1534 Defining_Identifier (Formal),
1535 Defining_Identifier (Original_Node (Analyzed_Formal)));
1538 if Partial_Parametrization then
1539 Process_Default (Formal);
1542 Error_Msg_Sloc := Sloc (Gen_Unit);
1545 Instantiation_Node, Defining_Identifier (Formal));
1546 Error_Msg_NE ("\in instantiation of & declared#",
1547 Instantiation_Node, Gen_Unit);
1549 Abandon_Instantiation (Instantiation_Node);
1555 (Instantiate_Formal_Package
1556 (Formal, Match, Analyzed_Formal),
1560 -- For use type and use package appearing in the generic part,
1561 -- we have already copied them, so we can just move them where
1562 -- they belong (we mustn't recopy them since this would mess up
1563 -- the Sloc values).
1565 when N_Use_Package_Clause |
1566 N_Use_Type_Clause =>
1567 if Nkind (Original_Node (I_Node)) =
1568 N_Formal_Package_Declaration
1570 Append (New_Copy_Tree (Formal), Assoc);
1573 Append (Formal, Assoc);
1577 raise Program_Error;
1581 Formal := Saved_Formal;
1582 Next_Non_Pragma (Analyzed_Formal);
1585 if Num_Actuals > Num_Matched then
1586 Error_Msg_Sloc := Sloc (Gen_Unit);
1588 if Present (Selector_Name (Actual)) then
1590 ("unmatched actual&",
1591 Actual, Selector_Name (Actual));
1592 Error_Msg_NE ("\in instantiation of& declared#",
1596 ("unmatched actual in instantiation of& declared#",
1601 elsif Present (Actuals) then
1603 ("too many actuals in generic instantiation", Instantiation_Node);
1606 -- An instantiation freezes all generic actuals. The only exceptions
1607 -- to this are incomplete types and subprograms which are not fully
1608 -- defined at the point of instantiation.
1611 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze);
1613 while Present (Elmt) loop
1614 Freeze_Before (I_Node, Node (Elmt));
1619 -- If there are default subprograms, normalize the tree by adding
1620 -- explicit associations for them. This is required if the instance
1621 -- appears within a generic.
1629 Elmt := First_Elmt (Default_Actuals);
1630 while Present (Elmt) loop
1631 if No (Actuals) then
1632 Actuals := New_List;
1633 Set_Generic_Associations (I_Node, Actuals);
1636 Subp := Node (Elmt);
1638 Make_Generic_Association (Sloc (Subp),
1639 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1640 Explicit_Generic_Actual_Parameter =>
1641 New_Occurrence_Of (Subp, Sloc (Subp)));
1642 Mark_Rewrite_Insertion (New_D);
1643 Append_To (Actuals, New_D);
1648 -- If this is a formal package, normalize the parameter list by adding
1649 -- explicit box associations for the formals that are covered by an
1652 if not Is_Empty_List (Default_Formals) then
1653 Append_List (Default_Formals, Formals);
1657 end Analyze_Associations;
1659 -------------------------------
1660 -- Analyze_Formal_Array_Type --
1661 -------------------------------
1663 procedure Analyze_Formal_Array_Type
1664 (T : in out Entity_Id;
1670 -- Treated like a non-generic array declaration, with additional
1675 if Nkind (Def) = N_Constrained_Array_Definition then
1676 DSS := First (Discrete_Subtype_Definitions (Def));
1677 while Present (DSS) loop
1678 if Nkind_In (DSS, N_Subtype_Indication,
1680 N_Attribute_Reference)
1682 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1689 Array_Type_Declaration (T, Def);
1690 Set_Is_Generic_Type (Base_Type (T));
1692 if Ekind (Component_Type (T)) = E_Incomplete_Type
1693 and then No (Full_View (Component_Type (T)))
1695 Error_Msg_N ("premature usage of incomplete type", Def);
1697 -- Check that range constraint is not allowed on the component type
1698 -- of a generic formal array type (AARM 12.5.3(3))
1700 elsif Is_Internal (Component_Type (T))
1701 and then Present (Subtype_Indication (Component_Definition (Def)))
1702 and then Nkind (Original_Node
1703 (Subtype_Indication (Component_Definition (Def)))) =
1704 N_Subtype_Indication
1707 ("in a formal, a subtype indication can only be "
1708 & "a subtype mark (RM 12.5.3(3))",
1709 Subtype_Indication (Component_Definition (Def)));
1712 end Analyze_Formal_Array_Type;
1714 ---------------------------------------------
1715 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1716 ---------------------------------------------
1718 -- As for other generic types, we create a valid type representation with
1719 -- legal but arbitrary attributes, whose values are never considered
1720 -- static. For all scalar types we introduce an anonymous base type, with
1721 -- the same attributes. We choose the corresponding integer type to be
1722 -- Standard_Integer.
1723 -- Here and in other similar routines, the Sloc of the generated internal
1724 -- type must be the same as the sloc of the defining identifier of the
1725 -- formal type declaration, to provide proper source navigation.
1727 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1731 Loc : constant Source_Ptr := Sloc (Def);
1733 Base : constant Entity_Id :=
1735 (E_Decimal_Fixed_Point_Type,
1737 Sloc (Defining_Identifier (Parent (Def))), 'G');
1739 Int_Base : constant Entity_Id := Standard_Integer;
1740 Delta_Val : constant Ureal := Ureal_1;
1741 Digs_Val : constant Uint := Uint_6;
1746 Set_Etype (Base, Base);
1747 Set_Size_Info (Base, Int_Base);
1748 Set_RM_Size (Base, RM_Size (Int_Base));
1749 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1750 Set_Digits_Value (Base, Digs_Val);
1751 Set_Delta_Value (Base, Delta_Val);
1752 Set_Small_Value (Base, Delta_Val);
1753 Set_Scalar_Range (Base,
1755 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1756 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1758 Set_Is_Generic_Type (Base);
1759 Set_Parent (Base, Parent (Def));
1761 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1762 Set_Etype (T, Base);
1763 Set_Size_Info (T, Int_Base);
1764 Set_RM_Size (T, RM_Size (Int_Base));
1765 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1766 Set_Digits_Value (T, Digs_Val);
1767 Set_Delta_Value (T, Delta_Val);
1768 Set_Small_Value (T, Delta_Val);
1769 Set_Scalar_Range (T, Scalar_Range (Base));
1770 Set_Is_Constrained (T);
1772 Check_Restriction (No_Fixed_Point, Def);
1773 end Analyze_Formal_Decimal_Fixed_Point_Type;
1775 -------------------------------------------
1776 -- Analyze_Formal_Derived_Interface_Type --
1777 -------------------------------------------
1779 procedure Analyze_Formal_Derived_Interface_Type
1784 Loc : constant Source_Ptr := Sloc (Def);
1787 -- Rewrite as a type declaration of a derived type. This ensures that
1788 -- the interface list and primitive operations are properly captured.
1791 Make_Full_Type_Declaration (Loc,
1792 Defining_Identifier => T,
1793 Type_Definition => Def));
1795 Set_Is_Generic_Type (T);
1796 end Analyze_Formal_Derived_Interface_Type;
1798 ---------------------------------
1799 -- Analyze_Formal_Derived_Type --
1800 ---------------------------------
1802 procedure Analyze_Formal_Derived_Type
1807 Loc : constant Source_Ptr := Sloc (Def);
1808 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1812 Set_Is_Generic_Type (T);
1814 if Private_Present (Def) then
1816 Make_Private_Extension_Declaration (Loc,
1817 Defining_Identifier => T,
1818 Discriminant_Specifications => Discriminant_Specifications (N),
1819 Unknown_Discriminants_Present => Unk_Disc,
1820 Subtype_Indication => Subtype_Mark (Def),
1821 Interface_List => Interface_List (Def));
1823 Set_Abstract_Present (New_N, Abstract_Present (Def));
1824 Set_Limited_Present (New_N, Limited_Present (Def));
1825 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1829 Make_Full_Type_Declaration (Loc,
1830 Defining_Identifier => T,
1831 Discriminant_Specifications =>
1832 Discriminant_Specifications (Parent (T)),
1834 Make_Derived_Type_Definition (Loc,
1835 Subtype_Indication => Subtype_Mark (Def)));
1837 Set_Abstract_Present
1838 (Type_Definition (New_N), Abstract_Present (Def));
1840 (Type_Definition (New_N), Limited_Present (Def));
1847 if not Is_Composite_Type (T) then
1849 ("unknown discriminants not allowed for elementary types", N);
1851 Set_Has_Unknown_Discriminants (T);
1852 Set_Is_Constrained (T, False);
1856 -- If the parent type has a known size, so does the formal, which makes
1857 -- legal representation clauses that involve the formal.
1859 Set_Size_Known_At_Compile_Time
1860 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1861 end Analyze_Formal_Derived_Type;
1863 ----------------------------------
1864 -- Analyze_Formal_Discrete_Type --
1865 ----------------------------------
1867 -- The operations defined for a discrete types are those of an enumeration
1868 -- type. The size is set to an arbitrary value, for use in analyzing the
1871 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1872 Loc : constant Source_Ptr := Sloc (Def);
1876 Base : constant Entity_Id :=
1878 (E_Floating_Point_Type, Current_Scope,
1879 Sloc (Defining_Identifier (Parent (Def))), 'G');
1883 Set_Ekind (T, E_Enumeration_Subtype);
1884 Set_Etype (T, Base);
1887 Set_Is_Generic_Type (T);
1888 Set_Is_Constrained (T);
1890 -- For semantic analysis, the bounds of the type must be set to some
1891 -- non-static value. The simplest is to create attribute nodes for those
1892 -- bounds, that refer to the type itself. These bounds are never
1893 -- analyzed but serve as place-holders.
1896 Make_Attribute_Reference (Loc,
1897 Attribute_Name => Name_First,
1898 Prefix => New_Reference_To (T, Loc));
1902 Make_Attribute_Reference (Loc,
1903 Attribute_Name => Name_Last,
1904 Prefix => New_Reference_To (T, Loc));
1907 Set_Scalar_Range (T,
1912 Set_Ekind (Base, E_Enumeration_Type);
1913 Set_Etype (Base, Base);
1914 Init_Size (Base, 8);
1915 Init_Alignment (Base);
1916 Set_Is_Generic_Type (Base);
1917 Set_Scalar_Range (Base, Scalar_Range (T));
1918 Set_Parent (Base, Parent (Def));
1919 end Analyze_Formal_Discrete_Type;
1921 ----------------------------------
1922 -- Analyze_Formal_Floating_Type --
1923 ---------------------------------
1925 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1926 Base : constant Entity_Id :=
1928 (E_Floating_Point_Type, Current_Scope,
1929 Sloc (Defining_Identifier (Parent (Def))), 'G');
1932 -- The various semantic attributes are taken from the predefined type
1933 -- Float, just so that all of them are initialized. Their values are
1934 -- never used because no constant folding or expansion takes place in
1935 -- the generic itself.
1938 Set_Ekind (T, E_Floating_Point_Subtype);
1939 Set_Etype (T, Base);
1940 Set_Size_Info (T, (Standard_Float));
1941 Set_RM_Size (T, RM_Size (Standard_Float));
1942 Set_Digits_Value (T, Digits_Value (Standard_Float));
1943 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1944 Set_Is_Constrained (T);
1946 Set_Is_Generic_Type (Base);
1947 Set_Etype (Base, Base);
1948 Set_Size_Info (Base, (Standard_Float));
1949 Set_RM_Size (Base, RM_Size (Standard_Float));
1950 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1951 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1952 Set_Parent (Base, Parent (Def));
1954 Check_Restriction (No_Floating_Point, Def);
1955 end Analyze_Formal_Floating_Type;
1957 -----------------------------------
1958 -- Analyze_Formal_Interface_Type;--
1959 -----------------------------------
1961 procedure Analyze_Formal_Interface_Type
1966 Loc : constant Source_Ptr := Sloc (N);
1971 Make_Full_Type_Declaration (Loc,
1972 Defining_Identifier => T,
1973 Type_Definition => Def);
1977 Set_Is_Generic_Type (T);
1978 end Analyze_Formal_Interface_Type;
1980 ---------------------------------
1981 -- Analyze_Formal_Modular_Type --
1982 ---------------------------------
1984 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1986 -- Apart from their entity kind, generic modular types are treated like
1987 -- signed integer types, and have the same attributes.
1989 Analyze_Formal_Signed_Integer_Type (T, Def);
1990 Set_Ekind (T, E_Modular_Integer_Subtype);
1991 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1993 end Analyze_Formal_Modular_Type;
1995 ---------------------------------------
1996 -- Analyze_Formal_Object_Declaration --
1997 ---------------------------------------
1999 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
2000 E : constant Node_Id := Default_Expression (N);
2001 Id : constant Node_Id := Defining_Identifier (N);
2008 -- Determine the mode of the formal object
2010 if Out_Present (N) then
2011 K := E_Generic_In_Out_Parameter;
2013 if not In_Present (N) then
2014 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
2018 K := E_Generic_In_Parameter;
2021 if Present (Subtype_Mark (N)) then
2022 Find_Type (Subtype_Mark (N));
2023 T := Entity (Subtype_Mark (N));
2025 -- Verify that there is no redundant null exclusion
2027 if Null_Exclusion_Present (N) then
2028 if not Is_Access_Type (T) then
2030 ("null exclusion can only apply to an access type", N);
2032 elsif Can_Never_Be_Null (T) then
2034 ("`NOT NULL` not allowed (& already excludes null)",
2039 -- Ada 2005 (AI-423): Formal object with an access definition
2042 Check_Access_Definition (N);
2043 T := Access_Definition
2045 N => Access_Definition (N));
2048 if Ekind (T) = E_Incomplete_Type then
2050 Error_Node : Node_Id;
2053 if Present (Subtype_Mark (N)) then
2054 Error_Node := Subtype_Mark (N);
2056 Check_Access_Definition (N);
2057 Error_Node := Access_Definition (N);
2060 Error_Msg_N ("premature usage of incomplete type", Error_Node);
2064 if K = E_Generic_In_Parameter then
2066 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2068 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
2070 ("generic formal of mode IN must not be of limited type", N);
2071 Explain_Limited_Type (T, N);
2074 if Is_Abstract_Type (T) then
2076 ("generic formal of mode IN must not be of abstract type", N);
2080 Preanalyze_Spec_Expression (E, T);
2082 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
2084 ("initialization not allowed for limited types", E);
2085 Explain_Limited_Type (T, E);
2092 -- Case of generic IN OUT parameter
2095 -- If the formal has an unconstrained type, construct its actual
2096 -- subtype, as is done for subprogram formals. In this fashion, all
2097 -- its uses can refer to specific bounds.
2102 if (Is_Array_Type (T)
2103 and then not Is_Constrained (T))
2105 (Ekind (T) = E_Record_Type
2106 and then Has_Discriminants (T))
2109 Non_Freezing_Ref : constant Node_Id :=
2110 New_Reference_To (Id, Sloc (Id));
2114 -- Make sure the actual subtype doesn't generate bogus freezing
2116 Set_Must_Not_Freeze (Non_Freezing_Ref);
2117 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
2118 Insert_Before_And_Analyze (N, Decl);
2119 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
2122 Set_Actual_Subtype (Id, T);
2127 ("initialization not allowed for `IN OUT` formals", N);
2131 if Has_Aspects (N) then
2132 Analyze_Aspect_Specifications (N, Id);
2134 end Analyze_Formal_Object_Declaration;
2136 ----------------------------------------------
2137 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2138 ----------------------------------------------
2140 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2144 Loc : constant Source_Ptr := Sloc (Def);
2145 Base : constant Entity_Id :=
2147 (E_Ordinary_Fixed_Point_Type, Current_Scope,
2148 Sloc (Defining_Identifier (Parent (Def))), 'G');
2151 -- The semantic attributes are set for completeness only, their values
2152 -- will never be used, since all properties of the type are non-static.
2155 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
2156 Set_Etype (T, Base);
2157 Set_Size_Info (T, Standard_Integer);
2158 Set_RM_Size (T, RM_Size (Standard_Integer));
2159 Set_Small_Value (T, Ureal_1);
2160 Set_Delta_Value (T, Ureal_1);
2161 Set_Scalar_Range (T,
2163 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
2164 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
2165 Set_Is_Constrained (T);
2167 Set_Is_Generic_Type (Base);
2168 Set_Etype (Base, Base);
2169 Set_Size_Info (Base, Standard_Integer);
2170 Set_RM_Size (Base, RM_Size (Standard_Integer));
2171 Set_Small_Value (Base, Ureal_1);
2172 Set_Delta_Value (Base, Ureal_1);
2173 Set_Scalar_Range (Base, Scalar_Range (T));
2174 Set_Parent (Base, Parent (Def));
2176 Check_Restriction (No_Fixed_Point, Def);
2177 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2179 ----------------------------------------
2180 -- Analyze_Formal_Package_Declaration --
2181 ----------------------------------------
2183 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2184 Loc : constant Source_Ptr := Sloc (N);
2185 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2187 Gen_Id : constant Node_Id := Name (N);
2189 Gen_Unit : Entity_Id;
2191 Parent_Installed : Boolean := False;
2193 Parent_Instance : Entity_Id;
2194 Renaming_In_Par : Entity_Id;
2195 Associations : Boolean := True;
2197 Vis_Prims_List : Elist_Id := No_Elist;
2198 -- List of primitives made temporarily visible in the instantiation
2199 -- to match the visibility of the formal type
2201 function Build_Local_Package return Node_Id;
2202 -- The formal package is rewritten so that its parameters are replaced
2203 -- with corresponding declarations. For parameters with bona fide
2204 -- associations these declarations are created by Analyze_Associations
2205 -- as for a regular instantiation. For boxed parameters, we preserve
2206 -- the formal declarations and analyze them, in order to introduce
2207 -- entities of the right kind in the environment of the formal.
2209 -------------------------
2210 -- Build_Local_Package --
2211 -------------------------
2213 function Build_Local_Package return Node_Id is
2215 Pack_Decl : Node_Id;
2218 -- Within the formal, the name of the generic package is a renaming
2219 -- of the formal (as for a regular instantiation).
2222 Make_Package_Declaration (Loc,
2225 (Specification (Original_Node (Gen_Decl)),
2226 Empty, Instantiating => True));
2228 Renaming := Make_Package_Renaming_Declaration (Loc,
2229 Defining_Unit_Name =>
2230 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2231 Name => New_Occurrence_Of (Formal, Loc));
2233 if Nkind (Gen_Id) = N_Identifier
2234 and then Chars (Gen_Id) = Chars (Pack_Id)
2237 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2240 -- If the formal is declared with a box, or with an others choice,
2241 -- create corresponding declarations for all entities in the formal
2242 -- part, so that names with the proper types are available in the
2243 -- specification of the formal package.
2245 -- On the other hand, if there are no associations, then all the
2246 -- formals must have defaults, and this will be checked by the
2247 -- call to Analyze_Associations.
2250 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2253 Formal_Decl : Node_Id;
2256 -- TBA : for a formal package, need to recurse ???
2261 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2262 while Present (Formal_Decl) loop
2264 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2269 -- If generic associations are present, use Analyze_Associations to
2270 -- create the proper renaming declarations.
2274 Act_Tree : constant Node_Id :=
2276 (Original_Node (Gen_Decl), Empty,
2277 Instantiating => True);
2280 Generic_Renamings.Set_Last (0);
2281 Generic_Renamings_HTable.Reset;
2282 Instantiation_Node := N;
2285 Analyze_Associations
2286 (I_Node => Original_Node (N),
2287 Formals => Generic_Formal_Declarations (Act_Tree),
2288 F_Copy => Generic_Formal_Declarations (Gen_Decl));
2290 Vis_Prims_List := Check_Hidden_Primitives (Decls);
2294 Append (Renaming, To => Decls);
2296 -- Add generated declarations ahead of local declarations in
2299 if No (Visible_Declarations (Specification (Pack_Decl))) then
2300 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2303 (First (Visible_Declarations (Specification (Pack_Decl))),
2308 end Build_Local_Package;
2310 -- Start of processing for Analyze_Formal_Package_Declaration
2313 Text_IO_Kludge (Gen_Id);
2316 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2317 Gen_Unit := Entity (Gen_Id);
2319 -- Check for a formal package that is a package renaming
2321 if Present (Renamed_Object (Gen_Unit)) then
2323 -- Indicate that unit is used, before replacing it with renamed
2324 -- entity for use below.
2326 if In_Extended_Main_Source_Unit (N) then
2327 Set_Is_Instantiated (Gen_Unit);
2328 Generate_Reference (Gen_Unit, N);
2331 Gen_Unit := Renamed_Object (Gen_Unit);
2334 if Ekind (Gen_Unit) /= E_Generic_Package then
2335 Error_Msg_N ("expect generic package name", Gen_Id);
2339 elsif Gen_Unit = Current_Scope then
2341 ("generic package cannot be used as a formal package of itself",
2346 elsif In_Open_Scopes (Gen_Unit) then
2347 if Is_Compilation_Unit (Gen_Unit)
2348 and then Is_Child_Unit (Current_Scope)
2350 -- Special-case the error when the formal is a parent, and
2351 -- continue analysis to minimize cascaded errors.
2354 ("generic parent cannot be used as formal package "
2355 & "of a child unit",
2360 ("generic package cannot be used as a formal package "
2368 -- Check that name of formal package does not hide name of generic,
2369 -- or its leading prefix. This check must be done separately because
2370 -- the name of the generic has already been analyzed.
2373 Gen_Name : Entity_Id;
2377 while Nkind (Gen_Name) = N_Expanded_Name loop
2378 Gen_Name := Prefix (Gen_Name);
2381 if Chars (Gen_Name) = Chars (Pack_Id) then
2383 ("& is hidden within declaration of formal package",
2389 or else No (Generic_Associations (N))
2390 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2392 Associations := False;
2395 -- If there are no generic associations, the generic parameters appear
2396 -- as local entities and are instantiated like them. We copy the generic
2397 -- package declaration as if it were an instantiation, and analyze it
2398 -- like a regular package, except that we treat the formals as
2399 -- additional visible components.
2401 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2403 if In_Extended_Main_Source_Unit (N) then
2404 Set_Is_Instantiated (Gen_Unit);
2405 Generate_Reference (Gen_Unit, N);
2408 Formal := New_Copy (Pack_Id);
2409 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2412 -- Make local generic without formals. The formals will be replaced
2413 -- with internal declarations.
2415 New_N := Build_Local_Package;
2417 -- If there are errors in the parameter list, Analyze_Associations
2418 -- raises Instantiation_Error. Patch the declaration to prevent
2419 -- further exception propagation.
2422 when Instantiation_Error =>
2424 Enter_Name (Formal);
2425 Set_Ekind (Formal, E_Variable);
2426 Set_Etype (Formal, Any_Type);
2427 Restore_Hidden_Primitives (Vis_Prims_List);
2429 if Parent_Installed then
2437 Set_Defining_Unit_Name (Specification (New_N), Formal);
2438 Set_Generic_Parent (Specification (N), Gen_Unit);
2439 Set_Instance_Env (Gen_Unit, Formal);
2440 Set_Is_Generic_Instance (Formal);
2442 Enter_Name (Formal);
2443 Set_Ekind (Formal, E_Package);
2444 Set_Etype (Formal, Standard_Void_Type);
2445 Set_Inner_Instances (Formal, New_Elmt_List);
2446 Push_Scope (Formal);
2448 if Is_Child_Unit (Gen_Unit)
2449 and then Parent_Installed
2451 -- Similarly, we have to make the name of the formal visible in the
2452 -- parent instance, to resolve properly fully qualified names that
2453 -- may appear in the generic unit. The parent instance has been
2454 -- placed on the scope stack ahead of the current scope.
2456 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2459 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2460 Set_Ekind (Renaming_In_Par, E_Package);
2461 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2462 Set_Scope (Renaming_In_Par, Parent_Instance);
2463 Set_Parent (Renaming_In_Par, Parent (Formal));
2464 Set_Renamed_Object (Renaming_In_Par, Formal);
2465 Append_Entity (Renaming_In_Par, Parent_Instance);
2468 Analyze (Specification (N));
2470 -- The formals for which associations are provided are not visible
2471 -- outside of the formal package. The others are still declared by a
2472 -- formal parameter declaration.
2474 -- If there are no associations, the only local entity to hide is the
2475 -- generated package renaming itself.
2481 E := First_Entity (Formal);
2482 while Present (E) loop
2484 and then not Is_Generic_Formal (E)
2489 if Ekind (E) = E_Package
2490 and then Renamed_Entity (E) = Formal
2500 End_Package_Scope (Formal);
2501 Restore_Hidden_Primitives (Vis_Prims_List);
2503 if Parent_Installed then
2509 -- Inside the generic unit, the formal package is a regular package, but
2510 -- no body is needed for it. Note that after instantiation, the defining
2511 -- unit name we need is in the new tree and not in the original (see
2512 -- Package_Instantiation). A generic formal package is an instance, and
2513 -- can be used as an actual for an inner instance.
2515 Set_Has_Completion (Formal, True);
2517 -- Add semantic information to the original defining identifier.
2520 Set_Ekind (Pack_Id, E_Package);
2521 Set_Etype (Pack_Id, Standard_Void_Type);
2522 Set_Scope (Pack_Id, Scope (Formal));
2523 Set_Has_Completion (Pack_Id, True);
2526 if Has_Aspects (N) then
2527 Analyze_Aspect_Specifications (N, Pack_Id);
2529 end Analyze_Formal_Package_Declaration;
2531 ---------------------------------
2532 -- Analyze_Formal_Private_Type --
2533 ---------------------------------
2535 procedure Analyze_Formal_Private_Type
2541 New_Private_Type (N, T, Def);
2543 -- Set the size to an arbitrary but legal value
2545 Set_Size_Info (T, Standard_Integer);
2546 Set_RM_Size (T, RM_Size (Standard_Integer));
2547 end Analyze_Formal_Private_Type;
2549 ------------------------------------
2550 -- Analyze_Formal_Incomplete_Type --
2551 ------------------------------------
2553 procedure Analyze_Formal_Incomplete_Type
2559 Set_Ekind (T, E_Incomplete_Type);
2561 Set_Private_Dependents (T, New_Elmt_List);
2563 if Tagged_Present (Def) then
2564 Set_Is_Tagged_Type (T);
2565 Make_Class_Wide_Type (T);
2566 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2568 end Analyze_Formal_Incomplete_Type;
2570 ----------------------------------------
2571 -- Analyze_Formal_Signed_Integer_Type --
2572 ----------------------------------------
2574 procedure Analyze_Formal_Signed_Integer_Type
2578 Base : constant Entity_Id :=
2580 (E_Signed_Integer_Type,
2582 Sloc (Defining_Identifier (Parent (Def))), 'G');
2587 Set_Ekind (T, E_Signed_Integer_Subtype);
2588 Set_Etype (T, Base);
2589 Set_Size_Info (T, Standard_Integer);
2590 Set_RM_Size (T, RM_Size (Standard_Integer));
2591 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2592 Set_Is_Constrained (T);
2594 Set_Is_Generic_Type (Base);
2595 Set_Size_Info (Base, Standard_Integer);
2596 Set_RM_Size (Base, RM_Size (Standard_Integer));
2597 Set_Etype (Base, Base);
2598 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2599 Set_Parent (Base, Parent (Def));
2600 end Analyze_Formal_Signed_Integer_Type;
2602 -------------------------------------------
2603 -- Analyze_Formal_Subprogram_Declaration --
2604 -------------------------------------------
2606 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2607 Spec : constant Node_Id := Specification (N);
2608 Def : constant Node_Id := Default_Name (N);
2609 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2617 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2618 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2622 Analyze_Subprogram_Declaration (N);
2623 Set_Is_Formal_Subprogram (Nam);
2624 Set_Has_Completion (Nam);
2626 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2627 Set_Is_Abstract_Subprogram (Nam);
2628 Set_Is_Dispatching_Operation (Nam);
2631 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2633 if No (Ctrl_Type) then
2635 ("abstract formal subprogram must have a controlling type",
2638 Check_Controlling_Formals (Ctrl_Type, Nam);
2643 -- Default name is resolved at the point of instantiation
2645 if Box_Present (N) then
2648 -- Else default is bound at the point of generic declaration
2650 elsif Present (Def) then
2651 if Nkind (Def) = N_Operator_Symbol then
2652 Find_Direct_Name (Def);
2654 elsif Nkind (Def) /= N_Attribute_Reference then
2658 -- For an attribute reference, analyze the prefix and verify
2659 -- that it has the proper profile for the subprogram.
2661 Analyze (Prefix (Def));
2662 Valid_Default_Attribute (Nam, Def);
2666 -- Default name may be overloaded, in which case the interpretation
2667 -- with the correct profile must be selected, as for a renaming.
2668 -- If the definition is an indexed component, it must denote a
2669 -- member of an entry family. If it is a selected component, it
2670 -- can be a protected operation.
2672 if Etype (Def) = Any_Type then
2675 elsif Nkind (Def) = N_Selected_Component then
2676 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2677 Error_Msg_N ("expect valid subprogram name as default", Def);
2680 elsif Nkind (Def) = N_Indexed_Component then
2681 if Is_Entity_Name (Prefix (Def)) then
2682 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2683 Error_Msg_N ("expect valid subprogram name as default", Def);
2686 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2687 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2690 Error_Msg_N ("expect valid subprogram name as default", Def);
2694 Error_Msg_N ("expect valid subprogram name as default", Def);
2698 elsif Nkind (Def) = N_Character_Literal then
2700 -- Needs some type checks: subprogram should be parameterless???
2702 Resolve (Def, (Etype (Nam)));
2704 elsif not Is_Entity_Name (Def)
2705 or else not Is_Overloadable (Entity (Def))
2707 Error_Msg_N ("expect valid subprogram name as default", Def);
2710 elsif not Is_Overloaded (Def) then
2711 Subp := Entity (Def);
2714 Error_Msg_N ("premature usage of formal subprogram", Def);
2716 elsif not Entity_Matches_Spec (Subp, Nam) then
2717 Error_Msg_N ("no visible entity matches specification", Def);
2720 -- More than one interpretation, so disambiguate as for a renaming
2725 I1 : Interp_Index := 0;
2731 Get_First_Interp (Def, I, It);
2732 while Present (It.Nam) loop
2733 if Entity_Matches_Spec (It.Nam, Nam) then
2734 if Subp /= Any_Id then
2735 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2737 if It1 = No_Interp then
2738 Error_Msg_N ("ambiguous default subprogram", Def);
2751 Get_Next_Interp (I, It);
2755 if Subp /= Any_Id then
2757 -- Subprogram found, generate reference to it
2759 Set_Entity (Def, Subp);
2760 Generate_Reference (Subp, Def);
2763 Error_Msg_N ("premature usage of formal subprogram", Def);
2765 elsif Ekind (Subp) /= E_Operator then
2766 Check_Mode_Conformant (Subp, Nam);
2770 Error_Msg_N ("no visible subprogram matches specification", N);
2776 if Has_Aspects (N) then
2777 Analyze_Aspect_Specifications (N, Nam);
2780 end Analyze_Formal_Subprogram_Declaration;
2782 -------------------------------------
2783 -- Analyze_Formal_Type_Declaration --
2784 -------------------------------------
2786 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2787 Def : constant Node_Id := Formal_Type_Definition (N);
2791 T := Defining_Identifier (N);
2793 if Present (Discriminant_Specifications (N))
2794 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2797 ("discriminants not allowed for this formal type", T);
2800 -- Enter the new name, and branch to specific routine
2803 when N_Formal_Private_Type_Definition =>
2804 Analyze_Formal_Private_Type (N, T, Def);
2806 when N_Formal_Derived_Type_Definition =>
2807 Analyze_Formal_Derived_Type (N, T, Def);
2809 when N_Formal_Incomplete_Type_Definition =>
2810 Analyze_Formal_Incomplete_Type (T, Def);
2812 when N_Formal_Discrete_Type_Definition =>
2813 Analyze_Formal_Discrete_Type (T, Def);
2815 when N_Formal_Signed_Integer_Type_Definition =>
2816 Analyze_Formal_Signed_Integer_Type (T, Def);
2818 when N_Formal_Modular_Type_Definition =>
2819 Analyze_Formal_Modular_Type (T, Def);
2821 when N_Formal_Floating_Point_Definition =>
2822 Analyze_Formal_Floating_Type (T, Def);
2824 when N_Formal_Ordinary_Fixed_Point_Definition =>
2825 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2827 when N_Formal_Decimal_Fixed_Point_Definition =>
2828 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2830 when N_Array_Type_Definition =>
2831 Analyze_Formal_Array_Type (T, Def);
2833 when N_Access_To_Object_Definition |
2834 N_Access_Function_Definition |
2835 N_Access_Procedure_Definition =>
2836 Analyze_Generic_Access_Type (T, Def);
2838 -- Ada 2005: a interface declaration is encoded as an abstract
2839 -- record declaration or a abstract type derivation.
2841 when N_Record_Definition =>
2842 Analyze_Formal_Interface_Type (N, T, Def);
2844 when N_Derived_Type_Definition =>
2845 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2851 raise Program_Error;
2855 Set_Is_Generic_Type (T);
2857 if Has_Aspects (N) then
2858 Analyze_Aspect_Specifications (N, T);
2860 end Analyze_Formal_Type_Declaration;
2862 ------------------------------------
2863 -- Analyze_Function_Instantiation --
2864 ------------------------------------
2866 procedure Analyze_Function_Instantiation (N : Node_Id) is
2868 Analyze_Subprogram_Instantiation (N, E_Function);
2869 end Analyze_Function_Instantiation;
2871 ---------------------------------
2872 -- Analyze_Generic_Access_Type --
2873 ---------------------------------
2875 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2879 if Nkind (Def) = N_Access_To_Object_Definition then
2880 Access_Type_Declaration (T, Def);
2882 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2883 and then No (Full_View (Designated_Type (T)))
2884 and then not Is_Generic_Type (Designated_Type (T))
2886 Error_Msg_N ("premature usage of incomplete type", Def);
2888 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2890 ("only a subtype mark is allowed in a formal", Def);
2894 Access_Subprogram_Declaration (T, Def);
2896 end Analyze_Generic_Access_Type;
2898 ---------------------------------
2899 -- Analyze_Generic_Formal_Part --
2900 ---------------------------------
2902 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2903 Gen_Parm_Decl : Node_Id;
2906 -- The generic formals are processed in the scope of the generic unit,
2907 -- where they are immediately visible. The scope is installed by the
2910 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2912 while Present (Gen_Parm_Decl) loop
2913 Analyze (Gen_Parm_Decl);
2914 Next (Gen_Parm_Decl);
2917 Generate_Reference_To_Generic_Formals (Current_Scope);
2918 end Analyze_Generic_Formal_Part;
2920 ------------------------------------------
2921 -- Analyze_Generic_Package_Declaration --
2922 ------------------------------------------
2924 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2925 Loc : constant Source_Ptr := Sloc (N);
2928 Save_Parent : Node_Id;
2930 Decls : constant List_Id :=
2931 Visible_Declarations (Specification (N));
2935 Check_SPARK_Restriction ("generic is not allowed", N);
2937 -- We introduce a renaming of the enclosing package, to have a usable
2938 -- entity as the prefix of an expanded name for a local entity of the
2939 -- form Par.P.Q, where P is the generic package. This is because a local
2940 -- entity named P may hide it, so that the usual visibility rules in
2941 -- the instance will not resolve properly.
2944 Make_Package_Renaming_Declaration (Loc,
2945 Defining_Unit_Name =>
2946 Make_Defining_Identifier (Loc,
2947 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2948 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2950 if Present (Decls) then
2951 Decl := First (Decls);
2952 while Present (Decl)
2953 and then Nkind (Decl) = N_Pragma
2958 if Present (Decl) then
2959 Insert_Before (Decl, Renaming);
2961 Append (Renaming, Visible_Declarations (Specification (N)));
2965 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2968 -- Create copy of generic unit, and save for instantiation. If the unit
2969 -- is a child unit, do not copy the specifications for the parent, which
2970 -- are not part of the generic tree.
2972 Save_Parent := Parent_Spec (N);
2973 Set_Parent_Spec (N, Empty);
2975 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2976 Set_Parent_Spec (New_N, Save_Parent);
2978 Id := Defining_Entity (N);
2979 Generate_Definition (Id);
2981 -- Expansion is not applied to generic units
2986 Set_Ekind (Id, E_Generic_Package);
2987 Set_Etype (Id, Standard_Void_Type);
2989 Enter_Generic_Scope (Id);
2990 Set_Inner_Instances (Id, New_Elmt_List);
2992 Set_Categorization_From_Pragmas (N);
2993 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2995 -- Link the declaration of the generic homonym in the generic copy to
2996 -- the package it renames, so that it is always resolved properly.
2998 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2999 Set_Entity (Associated_Node (Name (Renaming)), Id);
3001 -- For a library unit, we have reconstructed the entity for the unit,
3002 -- and must reset it in the library tables.
3004 if Nkind (Parent (N)) = N_Compilation_Unit then
3005 Set_Cunit_Entity (Current_Sem_Unit, Id);
3008 Analyze_Generic_Formal_Part (N);
3010 -- After processing the generic formals, analysis proceeds as for a
3011 -- non-generic package.
3013 Analyze (Specification (N));
3015 Validate_Categorization_Dependency (N, Id);
3019 End_Package_Scope (Id);
3020 Exit_Generic_Scope (Id);
3022 if Nkind (Parent (N)) /= N_Compilation_Unit then
3023 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
3024 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
3025 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
3028 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3029 Validate_RT_RAT_Component (N);
3031 -- If this is a spec without a body, check that generic parameters
3034 if not Body_Required (Parent (N)) then
3035 Check_References (Id);
3039 if Has_Aspects (N) then
3040 Analyze_Aspect_Specifications (N, Id);
3042 end Analyze_Generic_Package_Declaration;
3044 --------------------------------------------
3045 -- Analyze_Generic_Subprogram_Declaration --
3046 --------------------------------------------
3048 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
3053 Result_Type : Entity_Id;
3054 Save_Parent : Node_Id;
3058 Check_SPARK_Restriction ("generic is not allowed", N);
3060 -- Create copy of generic unit, and save for instantiation. If the unit
3061 -- is a child unit, do not copy the specifications for the parent, which
3062 -- are not part of the generic tree.
3064 Save_Parent := Parent_Spec (N);
3065 Set_Parent_Spec (N, Empty);
3067 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3068 Set_Parent_Spec (New_N, Save_Parent);
3071 -- The aspect specifications are not attached to the tree, and must
3072 -- be copied and attached to the generic copy explicitly.
3074 if Present (Aspect_Specifications (New_N)) then
3076 Aspects : constant List_Id := Aspect_Specifications (N);
3078 Set_Has_Aspects (N, False);
3079 Move_Aspects (New_N, N);
3080 Set_Has_Aspects (Original_Node (N), False);
3081 Set_Aspect_Specifications (Original_Node (N), Aspects);
3085 Spec := Specification (N);
3086 Id := Defining_Entity (Spec);
3087 Generate_Definition (Id);
3088 Set_Contract (Id, Make_Contract (Sloc (Id)));
3090 if Nkind (Id) = N_Defining_Operator_Symbol then
3092 ("operator symbol not allowed for generic subprogram", Id);
3099 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
3101 Enter_Generic_Scope (Id);
3102 Set_Inner_Instances (Id, New_Elmt_List);
3103 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3105 Analyze_Generic_Formal_Part (N);
3107 Formals := Parameter_Specifications (Spec);
3109 if Present (Formals) then
3110 Process_Formals (Formals, Spec);
3113 if Nkind (Spec) = N_Function_Specification then
3114 Set_Ekind (Id, E_Generic_Function);
3116 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
3117 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
3118 Set_Etype (Id, Result_Type);
3120 -- Check restriction imposed by AI05-073: a generic function
3121 -- cannot return an abstract type or an access to such.
3123 -- This is a binding interpretation should it apply to earlier
3124 -- versions of Ada as well as Ada 2012???
3126 if Is_Abstract_Type (Designated_Type (Result_Type))
3127 and then Ada_Version >= Ada_2012
3129 Error_Msg_N ("generic function cannot have an access result"
3130 & " that designates an abstract type", Spec);
3134 Find_Type (Result_Definition (Spec));
3135 Typ := Entity (Result_Definition (Spec));
3137 if Is_Abstract_Type (Typ)
3138 and then Ada_Version >= Ada_2012
3141 ("generic function cannot have abstract result type", Spec);
3144 -- If a null exclusion is imposed on the result type, then create
3145 -- a null-excluding itype (an access subtype) and use it as the
3146 -- function's Etype.
3148 if Is_Access_Type (Typ)
3149 and then Null_Exclusion_Present (Spec)
3152 Create_Null_Excluding_Itype
3154 Related_Nod => Spec,
3155 Scope_Id => Defining_Unit_Name (Spec)));
3157 Set_Etype (Id, Typ);
3162 Set_Ekind (Id, E_Generic_Procedure);
3163 Set_Etype (Id, Standard_Void_Type);
3166 -- For a library unit, we have reconstructed the entity for the unit,
3167 -- and must reset it in the library tables. We also make sure that
3168 -- Body_Required is set properly in the original compilation unit node.
3170 if Nkind (Parent (N)) = N_Compilation_Unit then
3171 Set_Cunit_Entity (Current_Sem_Unit, Id);
3172 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3175 Set_Categorization_From_Pragmas (N);
3176 Validate_Categorization_Dependency (N, Id);
3178 Save_Global_References (Original_Node (N));
3180 -- To capture global references, analyze the expressions of aspects,
3181 -- and propagate information to original tree. Note that in this case
3182 -- analysis of attributes is not delayed until the freeze point.
3184 -- It seems very hard to recreate the proper visibility of the generic
3185 -- subprogram at a later point because the analysis of an aspect may
3186 -- create pragmas after the generic copies have been made ???
3188 if Has_Aspects (N) then
3193 Aspect := First (Aspect_Specifications (N));
3194 while Present (Aspect) loop
3195 if Get_Aspect_Id (Chars (Identifier (Aspect)))
3198 Analyze (Expression (Aspect));
3203 Aspect := First (Aspect_Specifications (Original_Node (N)));
3204 while Present (Aspect) loop
3205 Save_Global_References (Expression (Aspect));
3213 Exit_Generic_Scope (Id);
3214 Generate_Reference_To_Formals (Id);
3216 List_Inherited_Pre_Post_Aspects (Id);
3217 end Analyze_Generic_Subprogram_Declaration;
3219 -----------------------------------
3220 -- Analyze_Package_Instantiation --
3221 -----------------------------------
3223 procedure Analyze_Package_Instantiation (N : Node_Id) is
3224 Loc : constant Source_Ptr := Sloc (N);
3225 Gen_Id : constant Node_Id := Name (N);
3228 Act_Decl_Name : Node_Id;
3229 Act_Decl_Id : Entity_Id;
3234 Gen_Unit : Entity_Id;
3236 Is_Actual_Pack : constant Boolean :=
3237 Is_Internal (Defining_Entity (N));
3239 Env_Installed : Boolean := False;
3240 Parent_Installed : Boolean := False;
3241 Renaming_List : List_Id;
3242 Unit_Renaming : Node_Id;
3243 Needs_Body : Boolean;
3244 Inline_Now : Boolean := False;
3246 Save_Style_Check : constant Boolean := Style_Check;
3247 -- Save style check mode for restore on exit
3249 procedure Delay_Descriptors (E : Entity_Id);
3250 -- Delay generation of subprogram descriptors for given entity
3252 function Might_Inline_Subp return Boolean;
3253 -- If inlining is active and the generic contains inlined subprograms,
3254 -- we instantiate the body. This may cause superfluous instantiations,
3255 -- but it is simpler than detecting the need for the body at the point
3256 -- of inlining, when the context of the instance is not available.
3258 -----------------------
3259 -- Delay_Descriptors --
3260 -----------------------
3262 procedure Delay_Descriptors (E : Entity_Id) is
3264 if not Delay_Subprogram_Descriptors (E) then
3265 Set_Delay_Subprogram_Descriptors (E);
3266 Pending_Descriptor.Append (E);
3268 end Delay_Descriptors;
3270 -----------------------
3271 -- Might_Inline_Subp --
3272 -----------------------
3274 function Might_Inline_Subp return Boolean is
3278 if not Inline_Processing_Required then
3282 E := First_Entity (Gen_Unit);
3283 while Present (E) loop
3284 if Is_Subprogram (E)
3285 and then Is_Inlined (E)
3295 end Might_Inline_Subp;
3297 -- Local declarations
3299 Vis_Prims_List : Elist_Id := No_Elist;
3300 -- List of primitives made temporarily visible in the instantiation
3301 -- to match the visibility of the formal type
3303 -- Start of processing for Analyze_Package_Instantiation
3306 Check_SPARK_Restriction ("generic is not allowed", N);
3308 -- Very first thing: apply the special kludge for Text_IO processing
3309 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3311 Text_IO_Kludge (Name (N));
3313 -- Make node global for error reporting
3315 Instantiation_Node := N;
3317 -- Turn off style checking in instances. If the check is enabled on the
3318 -- generic unit, a warning in an instance would just be noise. If not
3319 -- enabled on the generic, then a warning in an instance is just wrong.
3321 Style_Check := False;
3323 -- Case of instantiation of a generic package
3325 if Nkind (N) = N_Package_Instantiation then
3326 Act_Decl_Id := New_Copy (Defining_Entity (N));
3327 Set_Comes_From_Source (Act_Decl_Id, True);
3329 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3331 Make_Defining_Program_Unit_Name (Loc,
3332 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
3333 Defining_Identifier => Act_Decl_Id);
3335 Act_Decl_Name := Act_Decl_Id;
3338 -- Case of instantiation of a formal package
3341 Act_Decl_Id := Defining_Identifier (N);
3342 Act_Decl_Name := Act_Decl_Id;
3345 Generate_Definition (Act_Decl_Id);
3346 Preanalyze_Actuals (N);
3349 Env_Installed := True;
3351 -- Reset renaming map for formal types. The mapping is established
3352 -- when analyzing the generic associations, but some mappings are
3353 -- inherited from formal packages of parent units, and these are
3354 -- constructed when the parents are installed.
3356 Generic_Renamings.Set_Last (0);
3357 Generic_Renamings_HTable.Reset;
3359 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3360 Gen_Unit := Entity (Gen_Id);
3362 -- Verify that it is the name of a generic package
3364 -- A visibility glitch: if the instance is a child unit and the generic
3365 -- is the generic unit of a parent instance (i.e. both the parent and
3366 -- the child units are instances of the same package) the name now
3367 -- denotes the renaming within the parent, not the intended generic
3368 -- unit. See if there is a homonym that is the desired generic. The
3369 -- renaming declaration must be visible inside the instance of the
3370 -- child, but not when analyzing the name in the instantiation itself.
3372 if Ekind (Gen_Unit) = E_Package
3373 and then Present (Renamed_Entity (Gen_Unit))
3374 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3375 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3376 and then Present (Homonym (Gen_Unit))
3378 Gen_Unit := Homonym (Gen_Unit);
3381 if Etype (Gen_Unit) = Any_Type then
3385 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3387 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3389 if From_With_Type (Gen_Unit) then
3391 ("cannot instantiate a limited withed package", Gen_Id);
3394 ("expect name of generic package in instantiation", Gen_Id);
3401 if In_Extended_Main_Source_Unit (N) then
3402 Set_Is_Instantiated (Gen_Unit);
3403 Generate_Reference (Gen_Unit, N);
3405 if Present (Renamed_Object (Gen_Unit)) then
3406 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3407 Generate_Reference (Renamed_Object (Gen_Unit), N);
3411 if Nkind (Gen_Id) = N_Identifier
3412 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3415 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3417 elsif Nkind (Gen_Id) = N_Expanded_Name
3418 and then Is_Child_Unit (Gen_Unit)
3419 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3420 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3423 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3426 Set_Entity (Gen_Id, Gen_Unit);
3428 -- If generic is a renaming, get original generic unit
3430 if Present (Renamed_Object (Gen_Unit))
3431 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3433 Gen_Unit := Renamed_Object (Gen_Unit);
3436 -- Verify that there are no circular instantiations
3438 if In_Open_Scopes (Gen_Unit) then
3439 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3443 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3444 Error_Msg_Node_2 := Current_Scope;
3446 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3447 Circularity_Detected := True;
3452 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3454 -- Initialize renamings map, for error checking, and the list that
3455 -- holds private entities whose views have changed between generic
3456 -- definition and instantiation. If this is the instance created to
3457 -- validate an actual package, the instantiation environment is that
3458 -- of the enclosing instance.
3460 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3462 -- Copy original generic tree, to produce text for instantiation
3466 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3468 Act_Spec := Specification (Act_Tree);
3470 -- If this is the instance created to validate an actual package,
3471 -- only the formals matter, do not examine the package spec itself.
3473 if Is_Actual_Pack then
3474 Set_Visible_Declarations (Act_Spec, New_List);
3475 Set_Private_Declarations (Act_Spec, New_List);
3479 Analyze_Associations
3481 Formals => Generic_Formal_Declarations (Act_Tree),
3482 F_Copy => Generic_Formal_Declarations (Gen_Decl));
3484 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
3486 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3487 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3488 Set_Is_Generic_Instance (Act_Decl_Id);
3490 Set_Generic_Parent (Act_Spec, Gen_Unit);
3492 -- References to the generic in its own declaration or its body are
3493 -- references to the instance. Add a renaming declaration for the
3494 -- generic unit itself. This declaration, as well as the renaming
3495 -- declarations for the generic formals, must remain private to the
3496 -- unit: the formals, because this is the language semantics, and
3497 -- the unit because its use is an artifact of the implementation.
3500 Make_Package_Renaming_Declaration (Loc,
3501 Defining_Unit_Name =>
3502 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3503 Name => New_Reference_To (Act_Decl_Id, Loc));
3505 Append (Unit_Renaming, Renaming_List);
3507 -- The renaming declarations are the first local declarations of
3510 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3512 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3514 Set_Visible_Declarations (Act_Spec, Renaming_List);
3518 Make_Package_Declaration (Loc,
3519 Specification => Act_Spec);
3521 -- Save the instantiation node, for subsequent instantiation of the
3522 -- body, if there is one and we are generating code for the current
3523 -- unit. Mark the unit as having a body, to avoid a premature error
3526 -- We instantiate the body if we are generating code, if we are
3527 -- generating cross-reference information, or if we are building
3528 -- trees for ASIS use.
3531 Enclosing_Body_Present : Boolean := False;
3532 -- If the generic unit is not a compilation unit, then a body may
3533 -- be present in its parent even if none is required. We create a
3534 -- tentative pending instantiation for the body, which will be
3535 -- discarded if none is actually present.
3540 if Scope (Gen_Unit) /= Standard_Standard
3541 and then not Is_Child_Unit (Gen_Unit)
3543 Scop := Scope (Gen_Unit);
3545 while Present (Scop)
3546 and then Scop /= Standard_Standard
3548 if Unit_Requires_Body (Scop) then
3549 Enclosing_Body_Present := True;
3552 elsif In_Open_Scopes (Scop)
3553 and then In_Package_Body (Scop)
3555 Enclosing_Body_Present := True;
3559 exit when Is_Compilation_Unit (Scop);
3560 Scop := Scope (Scop);
3564 -- If front-end inlining is enabled, and this is a unit for which
3565 -- code will be generated, we instantiate the body at once.
3567 -- This is done if the instance is not the main unit, and if the
3568 -- generic is not a child unit of another generic, to avoid scope
3569 -- problems and the reinstallation of parent instances.
3572 and then (not Is_Child_Unit (Gen_Unit)
3573 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3574 and then Might_Inline_Subp
3575 and then not Is_Actual_Pack
3577 if Front_End_Inlining
3578 and then (Is_In_Main_Unit (N)
3579 or else In_Main_Context (Current_Scope))
3580 and then Nkind (Parent (N)) /= N_Compilation_Unit
3584 -- In configurable_run_time mode we force the inlining of
3585 -- predefined subprograms marked Inline_Always, to minimize
3586 -- the use of the run-time library.
3588 elsif Is_Predefined_File_Name
3589 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3590 and then Configurable_Run_Time_Mode
3591 and then Nkind (Parent (N)) /= N_Compilation_Unit
3596 -- If the current scope is itself an instance within a child
3597 -- unit, there will be duplications in the scope stack, and the
3598 -- unstacking mechanism in Inline_Instance_Body will fail.
3599 -- This loses some rare cases of optimization, and might be
3600 -- improved some day, if we can find a proper abstraction for
3601 -- "the complete compilation context" that can be saved and
3604 if Is_Generic_Instance (Current_Scope) then
3606 Curr_Unit : constant Entity_Id :=
3607 Cunit_Entity (Current_Sem_Unit);
3609 if Curr_Unit /= Current_Scope
3610 and then Is_Child_Unit (Curr_Unit)
3612 Inline_Now := False;
3619 (Unit_Requires_Body (Gen_Unit)
3620 or else Enclosing_Body_Present
3621 or else Present (Corresponding_Body (Gen_Decl)))
3622 and then (Is_In_Main_Unit (N)
3623 or else Might_Inline_Subp)
3624 and then not Is_Actual_Pack
3625 and then not Inline_Now
3626 and then not Alfa_Mode
3627 and then (Operating_Mode = Generate_Code
3628 or else (Operating_Mode = Check_Semantics
3629 and then ASIS_Mode));
3631 -- If front_end_inlining is enabled, do not instantiate body if
3632 -- within a generic context.
3634 if (Front_End_Inlining
3635 and then not Expander_Active)
3636 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3638 Needs_Body := False;
3641 -- If the current context is generic, and the package being
3642 -- instantiated is declared within a formal package, there is no
3643 -- body to instantiate until the enclosing generic is instantiated
3644 -- and there is an actual for the formal package. If the formal
3645 -- package has parameters, we build a regular package instance for
3646 -- it, that precedes the original formal package declaration.
3648 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3650 Decl : constant Node_Id :=
3652 (Unit_Declaration_Node (Scope (Gen_Unit)));
3654 if Nkind (Decl) = N_Formal_Package_Declaration
3655 or else (Nkind (Decl) = N_Package_Declaration
3656 and then Is_List_Member (Decl)
3657 and then Present (Next (Decl))
3659 Nkind (Next (Decl)) =
3660 N_Formal_Package_Declaration)
3662 Needs_Body := False;
3668 -- Note that we generate the instance body even when generating
3669 -- calling stubs for an RCI unit: it may be required e.g. if it
3670 -- provides stream attributes for some type used in the profile of a
3671 -- remote subprogram. If the instantiation is within the visible part
3672 -- of the RCI, then calling stubs for any relevant subprogram will
3673 -- be inserted immediately after the subprogram declaration, and
3674 -- will take precedence over the subsequent (original) body. (The
3675 -- stub and original body will be complete homographs, but this is
3676 -- permitted in an instance).
3678 -- Could we do better and remove the original subprogram body in that
3683 -- Here is a defence against a ludicrous number of instantiations
3684 -- caused by a circular set of instantiation attempts.
3686 if Pending_Instantiations.Last >
3687 Hostparm.Max_Instantiations
3689 Error_Msg_N ("too many instantiations", N);
3690 raise Unrecoverable_Error;
3693 -- Indicate that the enclosing scopes contain an instantiation,
3694 -- and that cleanup actions should be delayed until after the
3695 -- instance body is expanded.
3697 Check_Forward_Instantiation (Gen_Decl);
3698 if Nkind (N) = N_Package_Instantiation then
3700 Enclosing_Master : Entity_Id;
3703 -- Loop to search enclosing masters
3705 Enclosing_Master := Current_Scope;
3706 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3707 if Ekind (Enclosing_Master) = E_Package then
3708 if Is_Compilation_Unit (Enclosing_Master) then
3709 if In_Package_Body (Enclosing_Master) then
3711 (Body_Entity (Enclosing_Master));
3720 Enclosing_Master := Scope (Enclosing_Master);
3723 elsif Is_Generic_Unit (Enclosing_Master)
3724 or else Ekind (Enclosing_Master) = E_Void
3726 -- Cleanup actions will eventually be performed on the
3727 -- enclosing subprogram or package instance, if any.
3728 -- Enclosing scope is void in the formal part of a
3729 -- generic subprogram.
3734 if Ekind (Enclosing_Master) = E_Entry
3736 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3738 if not Expander_Active then
3742 Protected_Body_Subprogram (Enclosing_Master);
3746 Set_Delay_Cleanups (Enclosing_Master);
3748 while Ekind (Enclosing_Master) = E_Block loop
3749 Enclosing_Master := Scope (Enclosing_Master);
3752 if Is_Subprogram (Enclosing_Master) then
3753 Delay_Descriptors (Enclosing_Master);
3755 elsif Is_Task_Type (Enclosing_Master) then
3757 TBP : constant Node_Id :=
3758 Get_Task_Body_Procedure
3761 if Present (TBP) then
3762 Delay_Descriptors (TBP);
3763 Set_Delay_Cleanups (TBP);
3770 end loop Scope_Loop;
3773 -- Make entry in table
3775 Pending_Instantiations.Append
3777 Act_Decl => Act_Decl,
3778 Expander_Status => Expander_Active,
3779 Current_Sem_Unit => Current_Sem_Unit,
3780 Scope_Suppress => Scope_Suppress,
3781 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3782 Version => Ada_Version));
3786 Set_Categorization_From_Pragmas (Act_Decl);
3788 if Parent_Installed then
3792 Set_Instance_Spec (N, Act_Decl);
3794 -- If not a compilation unit, insert the package declaration before
3795 -- the original instantiation node.
3797 if Nkind (Parent (N)) /= N_Compilation_Unit then
3798 Mark_Rewrite_Insertion (Act_Decl);
3799 Insert_Before (N, Act_Decl);
3802 -- For an instantiation that is a compilation unit, place declaration
3803 -- on current node so context is complete for analysis (including
3804 -- nested instantiations). If this is the main unit, the declaration
3805 -- eventually replaces the instantiation node. If the instance body
3806 -- is created later, it replaces the instance node, and the
3807 -- declaration is attached to it (see
3808 -- Build_Instance_Compilation_Unit_Nodes).
3811 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3813 -- The entity for the current unit is the newly created one,
3814 -- and all semantic information is attached to it.
3816 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3818 -- If this is the main unit, replace the main entity as well
3820 if Current_Sem_Unit = Main_Unit then
3821 Main_Unit_Entity := Act_Decl_Id;
3825 Set_Unit (Parent (N), Act_Decl);
3826 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3827 Set_Package_Instantiation (Act_Decl_Id, N);
3829 Set_Unit (Parent (N), N);
3830 Set_Body_Required (Parent (N), False);
3832 -- We never need elaboration checks on instantiations, since by
3833 -- definition, the body instantiation is elaborated at the same
3834 -- time as the spec instantiation.
3836 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3837 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3840 Check_Elab_Instantiation (N);
3842 if ABE_Is_Certain (N) and then Needs_Body then
3843 Pending_Instantiations.Decrement_Last;
3846 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3848 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3849 First_Private_Entity (Act_Decl_Id));
3851 -- If the instantiation will receive a body, the unit will be
3852 -- transformed into a package body, and receive its own elaboration
3853 -- entity. Otherwise, the nature of the unit is now a package
3856 if Nkind (Parent (N)) = N_Compilation_Unit
3857 and then not Needs_Body
3859 Rewrite (N, Act_Decl);
3862 if Present (Corresponding_Body (Gen_Decl))
3863 or else Unit_Requires_Body (Gen_Unit)
3865 Set_Has_Completion (Act_Decl_Id);
3868 Check_Formal_Packages (Act_Decl_Id);
3870 Restore_Hidden_Primitives (Vis_Prims_List);
3871 Restore_Private_Views (Act_Decl_Id);
3873 Inherit_Context (Gen_Decl, N);
3875 if Parent_Installed then
3880 Env_Installed := False;
3883 Validate_Categorization_Dependency (N, Act_Decl_Id);
3885 -- There used to be a check here to prevent instantiations in local
3886 -- contexts if the No_Local_Allocators restriction was active. This
3887 -- check was removed by a binding interpretation in AI-95-00130/07,
3888 -- but we retain the code for documentation purposes.
3890 -- if Ekind (Act_Decl_Id) /= E_Void
3891 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3893 -- Check_Restriction (No_Local_Allocators, N);
3897 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3900 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3901 -- be used as defining identifiers for a formal package and for the
3902 -- corresponding expanded package.
3904 if Nkind (N) = N_Formal_Package_Declaration then
3905 Act_Decl_Id := New_Copy (Defining_Entity (N));
3906 Set_Comes_From_Source (Act_Decl_Id, True);
3907 Set_Is_Generic_Instance (Act_Decl_Id, False);
3908 Set_Defining_Identifier (N, Act_Decl_Id);
3911 Style_Check := Save_Style_Check;
3913 -- Check that if N is an instantiation of System.Dim_Float_IO or
3914 -- System.Dim_Integer_IO, the formal type has a dimension system.
3916 if Nkind (N) = N_Package_Instantiation
3917 and then Is_Dim_IO_Package_Instantiation (N)
3920 Assoc : constant Node_Id := First (Generic_Associations (N));
3922 if not Has_Dimension_System
3923 (Etype (Explicit_Generic_Actual_Parameter (Assoc)))
3925 Error_Msg_N ("type with a dimension system expected", Assoc);
3931 if Has_Aspects (N) then
3932 Analyze_Aspect_Specifications (N, Act_Decl_Id);
3936 when Instantiation_Error =>
3937 if Parent_Installed then
3941 if Env_Installed then
3945 Style_Check := Save_Style_Check;
3946 end Analyze_Package_Instantiation;
3948 --------------------------
3949 -- Inline_Instance_Body --
3950 --------------------------
3952 procedure Inline_Instance_Body
3954 Gen_Unit : Entity_Id;
3958 Gen_Comp : constant Entity_Id :=
3959 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3960 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3961 Curr_Scope : Entity_Id := Empty;
3962 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
3963 Removed : Boolean := False;
3964 Num_Scopes : Int := 0;
3966 Scope_Stack_Depth : constant Int :=
3967 Scope_Stack.Last - Scope_Stack.First + 1;
3969 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3970 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3971 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3972 Num_Inner : Int := 0;
3973 N_Instances : Int := 0;
3977 -- Case of generic unit defined in another unit. We must remove the
3978 -- complete context of the current unit to install that of the generic.
3980 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3982 -- Add some comments for the following two loops ???
3985 while Present (S) and then S /= Standard_Standard loop
3987 Num_Scopes := Num_Scopes + 1;
3989 Use_Clauses (Num_Scopes) :=
3991 (Scope_Stack.Last - Num_Scopes + 1).
3993 End_Use_Clauses (Use_Clauses (Num_Scopes));
3995 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3996 or else Scope_Stack.Table
3997 (Scope_Stack.Last - Num_Scopes).Entity
4001 exit when Is_Generic_Instance (S)
4002 and then (In_Package_Body (S)
4003 or else Ekind (S) = E_Procedure
4004 or else Ekind (S) = E_Function);
4008 Vis := Is_Immediately_Visible (Gen_Comp);
4010 -- Find and save all enclosing instances
4015 and then S /= Standard_Standard
4017 if Is_Generic_Instance (S) then
4018 N_Instances := N_Instances + 1;
4019 Instances (N_Instances) := S;
4021 exit when In_Package_Body (S);
4027 -- Remove context of current compilation unit, unless we are within a
4028 -- nested package instantiation, in which case the context has been
4029 -- removed previously.
4031 -- If current scope is the body of a child unit, remove context of
4032 -- spec as well. If an enclosing scope is an instance body, the
4033 -- context has already been removed, but the entities in the body
4034 -- must be made invisible as well.
4039 and then S /= Standard_Standard
4041 if Is_Generic_Instance (S)
4042 and then (In_Package_Body (S)
4043 or else Ekind (S) = E_Procedure
4044 or else Ekind (S) = E_Function)
4046 -- We still have to remove the entities of the enclosing
4047 -- instance from direct visibility.
4052 E := First_Entity (S);
4053 while Present (E) loop
4054 Set_Is_Immediately_Visible (E, False);
4063 or else (Ekind (Curr_Unit) = E_Package_Body
4064 and then S = Spec_Entity (Curr_Unit))
4065 or else (Ekind (Curr_Unit) = E_Subprogram_Body
4068 (Unit_Declaration_Node (Curr_Unit)))
4072 -- Remove entities in current scopes from visibility, so that
4073 -- instance body is compiled in a clean environment.
4075 Save_Scope_Stack (Handle_Use => False);
4077 if Is_Child_Unit (S) then
4079 -- Remove child unit from stack, as well as inner scopes.
4080 -- Removing the context of a child unit removes parent units
4083 while Current_Scope /= S loop
4084 Num_Inner := Num_Inner + 1;
4085 Inner_Scopes (Num_Inner) := Current_Scope;
4090 Remove_Context (Curr_Comp);
4094 Remove_Context (Curr_Comp);
4097 if Ekind (Curr_Unit) = E_Package_Body then
4098 Remove_Context (Library_Unit (Curr_Comp));
4104 pragma Assert (Num_Inner < Num_Scopes);
4106 Push_Scope (Standard_Standard);
4107 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
4108 Instantiate_Package_Body
4111 Act_Decl => Act_Decl,
4112 Expander_Status => Expander_Active,
4113 Current_Sem_Unit => Current_Sem_Unit,
4114 Scope_Suppress => Scope_Suppress,
4115 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4116 Version => Ada_Version)),
4117 Inlined_Body => True);
4123 Set_Is_Immediately_Visible (Gen_Comp, Vis);
4125 -- Reset Generic_Instance flag so that use clauses can be installed
4126 -- in the proper order. (See Use_One_Package for effect of enclosing
4127 -- instances on processing of use clauses).
4129 for J in 1 .. N_Instances loop
4130 Set_Is_Generic_Instance (Instances (J), False);
4134 Install_Context (Curr_Comp);
4136 if Present (Curr_Scope)
4137 and then Is_Child_Unit (Curr_Scope)
4139 Push_Scope (Curr_Scope);
4140 Set_Is_Immediately_Visible (Curr_Scope);
4142 -- Finally, restore inner scopes as well
4144 for J in reverse 1 .. Num_Inner loop
4145 Push_Scope (Inner_Scopes (J));
4149 Restore_Scope_Stack (Handle_Use => False);
4151 if Present (Curr_Scope)
4153 (In_Private_Part (Curr_Scope)
4154 or else In_Package_Body (Curr_Scope))
4156 -- Install private declaration of ancestor units, which are
4157 -- currently available. Restore_Scope_Stack and Install_Context
4158 -- only install the visible part of parents.
4163 Par := Scope (Curr_Scope);
4164 while (Present (Par))
4165 and then Par /= Standard_Standard
4167 Install_Private_Declarations (Par);
4174 -- Restore use clauses. For a child unit, use clauses in the parents
4175 -- are restored when installing the context, so only those in inner
4176 -- scopes (and those local to the child unit itself) need to be
4177 -- installed explicitly.
4179 if Is_Child_Unit (Curr_Unit)
4182 for J in reverse 1 .. Num_Inner + 1 loop
4183 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4185 Install_Use_Clauses (Use_Clauses (J));
4189 for J in reverse 1 .. Num_Scopes loop
4190 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4192 Install_Use_Clauses (Use_Clauses (J));
4196 -- Restore status of instances. If one of them is a body, make
4197 -- its local entities visible again.
4204 for J in 1 .. N_Instances loop
4205 Inst := Instances (J);
4206 Set_Is_Generic_Instance (Inst, True);
4208 if In_Package_Body (Inst)
4209 or else Ekind (S) = E_Procedure
4210 or else Ekind (S) = E_Function
4212 E := First_Entity (Instances (J));
4213 while Present (E) loop
4214 Set_Is_Immediately_Visible (E);
4221 -- If generic unit is in current unit, current context is correct
4224 Instantiate_Package_Body
4227 Act_Decl => Act_Decl,
4228 Expander_Status => Expander_Active,
4229 Current_Sem_Unit => Current_Sem_Unit,
4230 Scope_Suppress => Scope_Suppress,
4231 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4232 Version => Ada_Version)),
4233 Inlined_Body => True);
4235 end Inline_Instance_Body;
4237 -------------------------------------
4238 -- Analyze_Procedure_Instantiation --
4239 -------------------------------------
4241 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4243 Analyze_Subprogram_Instantiation (N, E_Procedure);
4244 end Analyze_Procedure_Instantiation;
4246 -----------------------------------
4247 -- Need_Subprogram_Instance_Body --
4248 -----------------------------------
4250 function Need_Subprogram_Instance_Body
4252 Subp : Entity_Id) return Boolean
4255 if (Is_In_Main_Unit (N)
4256 or else Is_Inlined (Subp)
4257 or else Is_Inlined (Alias (Subp)))
4258 and then (Operating_Mode = Generate_Code
4259 or else (Operating_Mode = Check_Semantics
4260 and then ASIS_Mode))
4261 and then (Full_Expander_Active or else ASIS_Mode)
4262 and then not ABE_Is_Certain (N)
4263 and then not Is_Eliminated (Subp)
4265 Pending_Instantiations.Append
4267 Act_Decl => Unit_Declaration_Node (Subp),
4268 Expander_Status => Expander_Active,
4269 Current_Sem_Unit => Current_Sem_Unit,
4270 Scope_Suppress => Scope_Suppress,
4271 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4272 Version => Ada_Version));
4278 end Need_Subprogram_Instance_Body;
4280 --------------------------------------
4281 -- Analyze_Subprogram_Instantiation --
4282 --------------------------------------
4284 procedure Analyze_Subprogram_Instantiation
4288 Loc : constant Source_Ptr := Sloc (N);
4289 Gen_Id : constant Node_Id := Name (N);
4291 Anon_Id : constant Entity_Id :=
4292 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4293 Chars => New_External_Name
4294 (Chars (Defining_Entity (N)), 'R'));
4296 Act_Decl_Id : Entity_Id;
4301 Env_Installed : Boolean := False;
4302 Gen_Unit : Entity_Id;
4304 Pack_Id : Entity_Id;
4305 Parent_Installed : Boolean := False;
4306 Renaming_List : List_Id;
4308 Save_Style_Check : constant Boolean := Style_Check;
4309 -- Save style check mode for restore on exit
4311 procedure Analyze_Instance_And_Renamings;
4312 -- The instance must be analyzed in a context that includes the mappings
4313 -- of generic parameters into actuals. We create a package declaration
4314 -- for this purpose, and a subprogram with an internal name within the
4315 -- package. The subprogram instance is simply an alias for the internal
4316 -- subprogram, declared in the current scope.
4318 ------------------------------------
4319 -- Analyze_Instance_And_Renamings --
4320 ------------------------------------
4322 procedure Analyze_Instance_And_Renamings is
4323 Def_Ent : constant Entity_Id := Defining_Entity (N);
4324 Pack_Decl : Node_Id;
4327 if Nkind (Parent (N)) = N_Compilation_Unit then
4329 -- For the case of a compilation unit, the container package has
4330 -- the same name as the instantiation, to insure that the binder
4331 -- calls the elaboration procedure with the right name. Copy the
4332 -- entity of the instance, which may have compilation level flags
4333 -- (e.g. Is_Child_Unit) set.
4335 Pack_Id := New_Copy (Def_Ent);
4338 -- Otherwise we use the name of the instantiation concatenated
4339 -- with its source position to ensure uniqueness if there are
4340 -- several instantiations with the same name.
4343 Make_Defining_Identifier (Loc,
4344 Chars => New_External_Name
4345 (Related_Id => Chars (Def_Ent),
4347 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4350 Pack_Decl := Make_Package_Declaration (Loc,
4351 Specification => Make_Package_Specification (Loc,
4352 Defining_Unit_Name => Pack_Id,
4353 Visible_Declarations => Renaming_List,
4354 End_Label => Empty));
4356 Set_Instance_Spec (N, Pack_Decl);
4357 Set_Is_Generic_Instance (Pack_Id);
4358 Set_Debug_Info_Needed (Pack_Id);
4360 -- Case of not a compilation unit
4362 if Nkind (Parent (N)) /= N_Compilation_Unit then
4363 Mark_Rewrite_Insertion (Pack_Decl);
4364 Insert_Before (N, Pack_Decl);
4365 Set_Has_Completion (Pack_Id);
4367 -- Case of an instantiation that is a compilation unit
4369 -- Place declaration on current node so context is complete for
4370 -- analysis (including nested instantiations), and for use in a
4371 -- context_clause (see Analyze_With_Clause).
4374 Set_Unit (Parent (N), Pack_Decl);
4375 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4378 Analyze (Pack_Decl);
4379 Check_Formal_Packages (Pack_Id);
4380 Set_Is_Generic_Instance (Pack_Id, False);
4382 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4385 -- Body of the enclosing package is supplied when instantiating the
4386 -- subprogram body, after semantic analysis is completed.
4388 if Nkind (Parent (N)) = N_Compilation_Unit then
4390 -- Remove package itself from visibility, so it does not
4391 -- conflict with subprogram.
4393 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4395 -- Set name and scope of internal subprogram so that the proper
4396 -- external name will be generated. The proper scope is the scope
4397 -- of the wrapper package. We need to generate debugging info for
4398 -- the internal subprogram, so set flag accordingly.
4400 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4401 Set_Scope (Anon_Id, Scope (Pack_Id));
4403 -- Mark wrapper package as referenced, to avoid spurious warnings
4404 -- if the instantiation appears in various with_ clauses of
4405 -- subunits of the main unit.
4407 Set_Referenced (Pack_Id);
4410 Set_Is_Generic_Instance (Anon_Id);
4411 Set_Debug_Info_Needed (Anon_Id);
4412 Act_Decl_Id := New_Copy (Anon_Id);
4414 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4415 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4416 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4417 Set_Comes_From_Source (Act_Decl_Id, True);
4419 -- The signature may involve types that are not frozen yet, but the
4420 -- subprogram will be frozen at the point the wrapper package is
4421 -- frozen, so it does not need its own freeze node. In fact, if one
4422 -- is created, it might conflict with the freezing actions from the
4425 Set_Has_Delayed_Freeze (Anon_Id, False);
4427 -- If the instance is a child unit, mark the Id accordingly. Mark
4428 -- the anonymous entity as well, which is the real subprogram and
4429 -- which is used when the instance appears in a context clause.
4430 -- Similarly, propagate the Is_Eliminated flag to handle properly
4431 -- nested eliminated subprograms.
4433 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4434 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4435 New_Overloaded_Entity (Act_Decl_Id);
4436 Check_Eliminated (Act_Decl_Id);
4437 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4439 -- In compilation unit case, kill elaboration checks on the
4440 -- instantiation, since they are never needed -- the body is
4441 -- instantiated at the same point as the spec.
4443 if Nkind (Parent (N)) = N_Compilation_Unit then
4444 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4445 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4446 Set_Is_Compilation_Unit (Anon_Id);
4448 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4451 -- The instance is not a freezing point for the new subprogram
4453 Set_Is_Frozen (Act_Decl_Id, False);
4455 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4456 Valid_Operator_Definition (Act_Decl_Id);
4459 Set_Alias (Act_Decl_Id, Anon_Id);
4460 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4461 Set_Has_Completion (Act_Decl_Id);
4462 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4464 if Nkind (Parent (N)) = N_Compilation_Unit then
4465 Set_Body_Required (Parent (N), False);
4467 end Analyze_Instance_And_Renamings;
4471 Vis_Prims_List : Elist_Id := No_Elist;
4472 -- List of primitives made temporarily visible in the instantiation
4473 -- to match the visibility of the formal type
4475 -- Start of processing for Analyze_Subprogram_Instantiation
4478 Check_SPARK_Restriction ("generic is not allowed", N);
4480 -- Very first thing: apply the special kludge for Text_IO processing
4481 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4482 -- Of course such an instantiation is bogus (these are packages, not
4483 -- subprograms), but we get a better error message if we do this.
4485 Text_IO_Kludge (Gen_Id);
4487 -- Make node global for error reporting
4489 Instantiation_Node := N;
4491 -- Turn off style checking in instances. If the check is enabled on the
4492 -- generic unit, a warning in an instance would just be noise. If not
4493 -- enabled on the generic, then a warning in an instance is just wrong.
4495 Style_Check := False;
4497 Preanalyze_Actuals (N);
4500 Env_Installed := True;
4501 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4502 Gen_Unit := Entity (Gen_Id);
4504 Generate_Reference (Gen_Unit, Gen_Id);
4506 if Nkind (Gen_Id) = N_Identifier
4507 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4510 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4513 if Etype (Gen_Unit) = Any_Type then
4518 -- Verify that it is a generic subprogram of the right kind, and that
4519 -- it does not lead to a circular instantiation.
4521 if not Ekind_In (Gen_Unit, E_Generic_Procedure, E_Generic_Function) then
4522 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
4524 elsif In_Open_Scopes (Gen_Unit) then
4525 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4527 elsif K = E_Procedure
4528 and then Ekind (Gen_Unit) /= E_Generic_Procedure
4530 if Ekind (Gen_Unit) = E_Generic_Function then
4532 ("cannot instantiate generic function as procedure", Gen_Id);
4535 ("expect name of generic procedure in instantiation", Gen_Id);
4538 elsif K = E_Function
4539 and then Ekind (Gen_Unit) /= E_Generic_Function
4541 if Ekind (Gen_Unit) = E_Generic_Procedure then
4543 ("cannot instantiate generic procedure as function", Gen_Id);
4546 ("expect name of generic function in instantiation", Gen_Id);
4550 Set_Entity (Gen_Id, Gen_Unit);
4551 Set_Is_Instantiated (Gen_Unit);
4553 if In_Extended_Main_Source_Unit (N) then
4554 Generate_Reference (Gen_Unit, N);
4557 -- If renaming, get original unit
4559 if Present (Renamed_Object (Gen_Unit))
4560 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4562 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4564 Gen_Unit := Renamed_Object (Gen_Unit);
4565 Set_Is_Instantiated (Gen_Unit);
4566 Generate_Reference (Gen_Unit, N);
4569 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4570 Error_Msg_Node_2 := Current_Scope;
4572 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4573 Circularity_Detected := True;
4574 Restore_Hidden_Primitives (Vis_Prims_List);
4578 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4580 -- Initialize renamings map, for error checking
4582 Generic_Renamings.Set_Last (0);
4583 Generic_Renamings_HTable.Reset;
4585 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4587 -- Copy original generic tree, to produce text for instantiation
4591 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4593 -- Inherit overriding indicator from instance node
4595 Act_Spec := Specification (Act_Tree);
4596 Set_Must_Override (Act_Spec, Must_Override (N));
4597 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4600 Analyze_Associations
4602 Formals => Generic_Formal_Declarations (Act_Tree),
4603 F_Copy => Generic_Formal_Declarations (Gen_Decl));
4605 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
4607 -- The subprogram itself cannot contain a nested instance, so the
4608 -- current parent is left empty.
4610 Set_Instance_Env (Gen_Unit, Empty);
4612 -- Build the subprogram declaration, which does not appear in the
4613 -- generic template, and give it a sloc consistent with that of the
4616 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4617 Set_Generic_Parent (Act_Spec, Gen_Unit);
4619 Make_Subprogram_Declaration (Sloc (Act_Spec),
4620 Specification => Act_Spec);
4622 -- The aspects have been copied previously, but they have to be
4623 -- linked explicitly to the new subprogram declaration. Explicit
4624 -- pre/postconditions on the instance are analyzed below, in a
4627 Move_Aspects (Act_Tree, Act_Decl);
4628 Set_Categorization_From_Pragmas (Act_Decl);
4630 if Parent_Installed then
4634 Append (Act_Decl, Renaming_List);
4635 Analyze_Instance_And_Renamings;
4637 -- If the generic is marked Import (Intrinsic), then so is the
4638 -- instance. This indicates that there is no body to instantiate. If
4639 -- generic is marked inline, so it the instance, and the anonymous
4640 -- subprogram it renames. If inlined, or else if inlining is enabled
4641 -- for the compilation, we generate the instance body even if it is
4642 -- not within the main unit.
4644 if Is_Intrinsic_Subprogram (Gen_Unit) then
4645 Set_Is_Intrinsic_Subprogram (Anon_Id);
4646 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4648 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4649 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4653 -- Inherit convention from generic unit. Intrinsic convention, as for
4654 -- an instance of unchecked conversion, is not inherited because an
4655 -- explicit Ada instance has been created.
4657 if Has_Convention_Pragma (Gen_Unit)
4658 and then Convention (Gen_Unit) /= Convention_Intrinsic
4660 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
4661 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
4664 Generate_Definition (Act_Decl_Id);
4665 Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id))); -- ??? needed?
4666 Set_Contract (Act_Decl_Id, Make_Contract (Sloc (Act_Decl_Id)));
4668 -- Inherit all inlining-related flags which apply to the generic in
4669 -- the subprogram and its declaration.
4671 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4672 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4674 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
4675 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
4677 Set_Has_Pragma_Inline_Always
4678 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
4679 Set_Has_Pragma_Inline_Always
4680 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
4682 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4683 Check_Elab_Instantiation (N);
4686 if Is_Dispatching_Operation (Act_Decl_Id)
4687 and then Ada_Version >= Ada_2005
4693 Formal := First_Formal (Act_Decl_Id);
4694 while Present (Formal) loop
4695 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4696 and then Is_Controlling_Formal (Formal)
4697 and then not Can_Never_Be_Null (Formal)
4699 Error_Msg_NE ("access parameter& is controlling,",
4702 ("\corresponding parameter of & must be"
4703 & " explicitly null-excluding", N, Gen_Id);
4706 Next_Formal (Formal);
4711 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4713 Validate_Categorization_Dependency (N, Act_Decl_Id);
4715 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4716 Inherit_Context (Gen_Decl, N);
4718 Restore_Private_Views (Pack_Id, False);
4720 -- If the context requires a full instantiation, mark node for
4721 -- subsequent construction of the body.
4723 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4725 Check_Forward_Instantiation (Gen_Decl);
4727 -- The wrapper package is always delayed, because it does not
4728 -- constitute a freeze point, but to insure that the freeze
4729 -- node is placed properly, it is created directly when
4730 -- instantiating the body (otherwise the freeze node might
4731 -- appear to early for nested instantiations).
4733 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4735 -- For ASIS purposes, indicate that the wrapper package has
4736 -- replaced the instantiation node.
4738 Rewrite (N, Unit (Parent (N)));
4739 Set_Unit (Parent (N), N);
4742 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4744 -- Replace instance node for library-level instantiations of
4745 -- intrinsic subprograms, for ASIS use.
4747 Rewrite (N, Unit (Parent (N)));
4748 Set_Unit (Parent (N), N);
4751 if Parent_Installed then
4755 Restore_Hidden_Primitives (Vis_Prims_List);
4757 Env_Installed := False;
4758 Generic_Renamings.Set_Last (0);
4759 Generic_Renamings_HTable.Reset;
4762 Style_Check := Save_Style_Check;
4765 if Has_Aspects (N) then
4766 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4770 when Instantiation_Error =>
4771 if Parent_Installed then
4775 if Env_Installed then
4779 Style_Check := Save_Style_Check;
4780 end Analyze_Subprogram_Instantiation;
4782 -------------------------
4783 -- Get_Associated_Node --
4784 -------------------------
4786 function Get_Associated_Node (N : Node_Id) return Node_Id is
4790 Assoc := Associated_Node (N);
4792 if Nkind (Assoc) /= Nkind (N) then
4795 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4799 -- If the node is part of an inner generic, it may itself have been
4800 -- remapped into a further generic copy. Associated_Node is otherwise
4801 -- used for the entity of the node, and will be of a different node
4802 -- kind, or else N has been rewritten as a literal or function call.
4804 while Present (Associated_Node (Assoc))
4805 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4807 Assoc := Associated_Node (Assoc);
4810 -- Follow and additional link in case the final node was rewritten.
4811 -- This can only happen with nested generic units.
4813 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4814 and then Present (Associated_Node (Assoc))
4815 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4816 N_Explicit_Dereference,
4821 Assoc := Associated_Node (Assoc);
4826 end Get_Associated_Node;
4828 -------------------------------------------
4829 -- Build_Instance_Compilation_Unit_Nodes --
4830 -------------------------------------------
4832 procedure Build_Instance_Compilation_Unit_Nodes
4837 Decl_Cunit : Node_Id;
4838 Body_Cunit : Node_Id;
4840 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4841 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4844 -- A new compilation unit node is built for the instance declaration
4847 Make_Compilation_Unit (Sloc (N),
4848 Context_Items => Empty_List,
4851 Make_Compilation_Unit_Aux (Sloc (N)));
4853 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4855 -- The new compilation unit is linked to its body, but both share the
4856 -- same file, so we do not set Body_Required on the new unit so as not
4857 -- to create a spurious dependency on a non-existent body in the ali.
4858 -- This simplifies CodePeer unit traversal.
4860 -- We use the original instantiation compilation unit as the resulting
4861 -- compilation unit of the instance, since this is the main unit.
4863 Rewrite (N, Act_Body);
4864 Body_Cunit := Parent (N);
4866 -- The two compilation unit nodes are linked by the Library_Unit field
4868 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4869 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4871 -- Preserve the private nature of the package if needed
4873 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4875 -- If the instance is not the main unit, its context, categorization
4876 -- and elaboration entity are not relevant to the compilation.
4878 if Body_Cunit /= Cunit (Main_Unit) then
4879 Make_Instance_Unit (Body_Cunit, In_Main => False);
4883 -- The context clause items on the instantiation, which are now attached
4884 -- to the body compilation unit (since the body overwrote the original
4885 -- instantiation node), semantically belong on the spec, so copy them
4886 -- there. It's harmless to leave them on the body as well. In fact one
4887 -- could argue that they belong in both places.
4889 Citem := First (Context_Items (Body_Cunit));
4890 while Present (Citem) loop
4891 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4895 -- Propagate categorization flags on packages, so that they appear in
4896 -- the ali file for the spec of the unit.
4898 if Ekind (New_Main) = E_Package then
4899 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4900 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4901 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4902 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4903 Set_Is_Remote_Call_Interface
4904 (Old_Main, Is_Remote_Call_Interface (New_Main));
4907 -- Make entry in Units table, so that binder can generate call to
4908 -- elaboration procedure for body, if any.
4910 Make_Instance_Unit (Body_Cunit, In_Main => True);
4911 Main_Unit_Entity := New_Main;
4912 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4914 -- Build elaboration entity, since the instance may certainly generate
4915 -- elaboration code requiring a flag for protection.
4917 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4918 end Build_Instance_Compilation_Unit_Nodes;
4920 -----------------------------
4921 -- Check_Access_Definition --
4922 -----------------------------
4924 procedure Check_Access_Definition (N : Node_Id) is
4927 (Ada_Version >= Ada_2005
4928 and then Present (Access_Definition (N)));
4930 end Check_Access_Definition;
4932 -----------------------------------
4933 -- Check_Formal_Package_Instance --
4934 -----------------------------------
4936 -- If the formal has specific parameters, they must match those of the
4937 -- actual. Both of them are instances, and the renaming declarations for
4938 -- their formal parameters appear in the same order in both. The analyzed
4939 -- formal has been analyzed in the context of the current instance.
4941 procedure Check_Formal_Package_Instance
4942 (Formal_Pack : Entity_Id;
4943 Actual_Pack : Entity_Id)
4945 E1 : Entity_Id := First_Entity (Actual_Pack);
4946 E2 : Entity_Id := First_Entity (Formal_Pack);
4951 procedure Check_Mismatch (B : Boolean);
4952 -- Common error routine for mismatch between the parameters of the
4953 -- actual instance and those of the formal package.
4955 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4956 -- The formal may come from a nested formal package, and the actual may
4957 -- have been constant-folded. To determine whether the two denote the
4958 -- same entity we may have to traverse several definitions to recover
4959 -- the ultimate entity that they refer to.
4961 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4962 -- Similarly, if the formal comes from a nested formal package, the
4963 -- actual may designate the formal through multiple renamings, which
4964 -- have to be followed to determine the original variable in question.
4966 --------------------
4967 -- Check_Mismatch --
4968 --------------------
4970 procedure Check_Mismatch (B : Boolean) is
4971 Kind : constant Node_Kind := Nkind (Parent (E2));
4974 if Kind = N_Formal_Type_Declaration then
4977 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
4978 N_Formal_Package_Declaration)
4979 or else Kind in N_Formal_Subprogram_Declaration
4985 ("actual for & in actual instance does not match formal",
4986 Parent (Actual_Pack), E1);
4990 --------------------------------
4991 -- Same_Instantiated_Constant --
4992 --------------------------------
4994 function Same_Instantiated_Constant
4995 (E1, E2 : Entity_Id) return Boolean
5001 while Present (Ent) loop
5005 elsif Ekind (Ent) /= E_Constant then
5008 elsif Is_Entity_Name (Constant_Value (Ent)) then
5009 if Entity (Constant_Value (Ent)) = E1 then
5012 Ent := Entity (Constant_Value (Ent));
5015 -- The actual may be a constant that has been folded. Recover
5018 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
5019 Ent := Entity (Original_Node (Constant_Value (Ent)));
5026 end Same_Instantiated_Constant;
5028 --------------------------------
5029 -- Same_Instantiated_Variable --
5030 --------------------------------
5032 function Same_Instantiated_Variable
5033 (E1, E2 : Entity_Id) return Boolean
5035 function Original_Entity (E : Entity_Id) return Entity_Id;
5036 -- Follow chain of renamings to the ultimate ancestor
5038 ---------------------
5039 -- Original_Entity --
5040 ---------------------
5042 function Original_Entity (E : Entity_Id) return Entity_Id is
5047 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
5048 and then Present (Renamed_Object (Orig))
5049 and then Is_Entity_Name (Renamed_Object (Orig))
5051 Orig := Entity (Renamed_Object (Orig));
5055 end Original_Entity;
5057 -- Start of processing for Same_Instantiated_Variable
5060 return Ekind (E1) = Ekind (E2)
5061 and then Original_Entity (E1) = Original_Entity (E2);
5062 end Same_Instantiated_Variable;
5064 -- Start of processing for Check_Formal_Package_Instance
5068 and then Present (E2)
5070 exit when Ekind (E1) = E_Package
5071 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
5073 -- If the formal is the renaming of the formal package, this
5074 -- is the end of its formal part, which may occur before the
5075 -- end of the formal part in the actual in the presence of
5076 -- defaulted parameters in the formal package.
5078 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
5079 and then Renamed_Entity (E2) = Scope (E2);
5081 -- The analysis of the actual may generate additional internal
5082 -- entities. If the formal is defaulted, there is no corresponding
5083 -- analysis and the internal entities must be skipped, until we
5084 -- find corresponding entities again.
5086 if Comes_From_Source (E2)
5087 and then not Comes_From_Source (E1)
5088 and then Chars (E1) /= Chars (E2)
5091 and then Chars (E1) /= Chars (E2)
5100 -- If the formal entity comes from a formal declaration, it was
5101 -- defaulted in the formal package, and no check is needed on it.
5103 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
5106 elsif Is_Type (E1) then
5108 -- Subtypes must statically match. E1, E2 are the local entities
5109 -- that are subtypes of the actuals. Itypes generated for other
5110 -- parameters need not be checked, the check will be performed
5111 -- on the parameters themselves.
5113 -- If E2 is a formal type declaration, it is a defaulted parameter
5114 -- and needs no checking.
5116 if not Is_Itype (E1)
5117 and then not Is_Itype (E2)
5121 or else Etype (E1) /= Etype (E2)
5122 or else not Subtypes_Statically_Match (E1, E2));
5125 elsif Ekind (E1) = E_Constant then
5127 -- IN parameters must denote the same static value, or the same
5128 -- constant, or the literal null.
5130 Expr1 := Expression (Parent (E1));
5132 if Ekind (E2) /= E_Constant then
5133 Check_Mismatch (True);
5136 Expr2 := Expression (Parent (E2));
5139 if Is_Static_Expression (Expr1) then
5141 if not Is_Static_Expression (Expr2) then
5142 Check_Mismatch (True);
5144 elsif Is_Discrete_Type (Etype (E1)) then
5146 V1 : constant Uint := Expr_Value (Expr1);
5147 V2 : constant Uint := Expr_Value (Expr2);
5149 Check_Mismatch (V1 /= V2);
5152 elsif Is_Real_Type (Etype (E1)) then
5154 V1 : constant Ureal := Expr_Value_R (Expr1);
5155 V2 : constant Ureal := Expr_Value_R (Expr2);
5157 Check_Mismatch (V1 /= V2);
5160 elsif Is_String_Type (Etype (E1))
5161 and then Nkind (Expr1) = N_String_Literal
5163 if Nkind (Expr2) /= N_String_Literal then
5164 Check_Mismatch (True);
5167 (not String_Equal (Strval (Expr1), Strval (Expr2)));
5171 elsif Is_Entity_Name (Expr1) then
5172 if Is_Entity_Name (Expr2) then
5173 if Entity (Expr1) = Entity (Expr2) then
5177 (not Same_Instantiated_Constant
5178 (Entity (Expr1), Entity (Expr2)));
5181 Check_Mismatch (True);
5184 elsif Is_Entity_Name (Original_Node (Expr1))
5185 and then Is_Entity_Name (Expr2)
5187 Same_Instantiated_Constant
5188 (Entity (Original_Node (Expr1)), Entity (Expr2))
5192 elsif Nkind (Expr1) = N_Null then
5193 Check_Mismatch (Nkind (Expr1) /= N_Null);
5196 Check_Mismatch (True);
5199 elsif Ekind (E1) = E_Variable then
5200 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
5202 elsif Ekind (E1) = E_Package then
5204 (Ekind (E1) /= Ekind (E2)
5205 or else Renamed_Object (E1) /= Renamed_Object (E2));
5207 elsif Is_Overloadable (E1) then
5209 -- Verify that the actual subprograms match. Note that actuals
5210 -- that are attributes are rewritten as subprograms. If the
5211 -- subprogram in the formal package is defaulted, no check is
5212 -- needed. Note that this can only happen in Ada 2005 when the
5213 -- formal package can be partially parameterized.
5215 if Nkind (Unit_Declaration_Node (E1)) =
5216 N_Subprogram_Renaming_Declaration
5217 and then From_Default (Unit_Declaration_Node (E1))
5221 -- If the formal package has an "others" box association that
5222 -- covers this formal, there is no need for a check either.
5224 elsif Nkind (Unit_Declaration_Node (E2)) in
5225 N_Formal_Subprogram_Declaration
5226 and then Box_Present (Unit_Declaration_Node (E2))
5230 -- No check needed if subprogram is a defaulted null procedure
5232 elsif No (Alias (E2))
5233 and then Ekind (E2) = E_Procedure
5235 Null_Present (Specification (Unit_Declaration_Node (E2)))
5239 -- Otherwise the actual in the formal and the actual in the
5240 -- instantiation of the formal must match, up to renamings.
5244 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5248 raise Program_Error;
5255 end Check_Formal_Package_Instance;
5257 ---------------------------
5258 -- Check_Formal_Packages --
5259 ---------------------------
5261 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5263 Formal_P : Entity_Id;
5266 -- Iterate through the declarations in the instance, looking for package
5267 -- renaming declarations that denote instances of formal packages. Stop
5268 -- when we find the renaming of the current package itself. The
5269 -- declaration for a formal package without a box is followed by an
5270 -- internal entity that repeats the instantiation.
5272 E := First_Entity (P_Id);
5273 while Present (E) loop
5274 if Ekind (E) = E_Package then
5275 if Renamed_Object (E) = P_Id then
5278 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5281 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5282 Formal_P := Next_Entity (E);
5283 Check_Formal_Package_Instance (Formal_P, E);
5285 -- After checking, remove the internal validating package. It
5286 -- is only needed for semantic checks, and as it may contain
5287 -- generic formal declarations it should not reach gigi.
5289 Remove (Unit_Declaration_Node (Formal_P));
5295 end Check_Formal_Packages;
5297 ---------------------------------
5298 -- Check_Forward_Instantiation --
5299 ---------------------------------
5301 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5303 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5306 -- The instantiation appears before the generic body if we are in the
5307 -- scope of the unit containing the generic, either in its spec or in
5308 -- the package body, and before the generic body.
5310 if Ekind (Gen_Comp) = E_Package_Body then
5311 Gen_Comp := Spec_Entity (Gen_Comp);
5314 if In_Open_Scopes (Gen_Comp)
5315 and then No (Corresponding_Body (Decl))
5320 and then not Is_Compilation_Unit (S)
5321 and then not Is_Child_Unit (S)
5323 if Ekind (S) = E_Package then
5324 Set_Has_Forward_Instantiation (S);
5330 end Check_Forward_Instantiation;
5332 ---------------------------
5333 -- Check_Generic_Actuals --
5334 ---------------------------
5336 -- The visibility of the actuals may be different between the point of
5337 -- generic instantiation and the instantiation of the body.
5339 procedure Check_Generic_Actuals
5340 (Instance : Entity_Id;
5341 Is_Formal_Box : Boolean)
5346 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5347 -- For a formal that is an array type, the component type is often a
5348 -- previous formal in the same unit. The privacy status of the component
5349 -- type will have been examined earlier in the traversal of the
5350 -- corresponding actuals, and this status should not be modified for the
5351 -- array type itself.
5353 -- To detect this case we have to rescan the list of formals, which
5354 -- is usually short enough to ignore the resulting inefficiency.
5356 -----------------------------
5357 -- Denotes_Previous_Actual --
5358 -----------------------------
5360 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5364 Prev := First_Entity (Instance);
5365 while Present (Prev) loop
5367 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5368 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5369 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5382 end Denotes_Previous_Actual;
5384 -- Start of processing for Check_Generic_Actuals
5387 E := First_Entity (Instance);
5388 while Present (E) loop
5390 and then Nkind (Parent (E)) = N_Subtype_Declaration
5391 and then Scope (Etype (E)) /= Instance
5392 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5394 if Is_Array_Type (E)
5395 and then Denotes_Previous_Actual (Component_Type (E))
5399 Check_Private_View (Subtype_Indication (Parent (E)));
5402 Set_Is_Generic_Actual_Type (E, True);
5403 Set_Is_Hidden (E, False);
5404 Set_Is_Potentially_Use_Visible (E,
5407 -- We constructed the generic actual type as a subtype of the
5408 -- supplied type. This means that it normally would not inherit
5409 -- subtype specific attributes of the actual, which is wrong for
5410 -- the generic case.
5412 Astype := Ancestor_Subtype (E);
5416 -- This can happen when E is an itype that is the full view of
5417 -- a private type completed, e.g. with a constrained array. In
5418 -- that case, use the first subtype, which will carry size
5419 -- information. The base type itself is unconstrained and will
5422 Astype := First_Subtype (E);
5425 Set_Size_Info (E, (Astype));
5426 Set_RM_Size (E, RM_Size (Astype));
5427 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5429 if Is_Discrete_Or_Fixed_Point_Type (E) then
5430 Set_RM_Size (E, RM_Size (Astype));
5432 -- In nested instances, the base type of an access actual
5433 -- may itself be private, and need to be exchanged.
5435 elsif Is_Access_Type (E)
5436 and then Is_Private_Type (Etype (E))
5439 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5442 elsif Ekind (E) = E_Package then
5444 -- If this is the renaming for the current instance, we're done.
5445 -- Otherwise it is a formal package. If the corresponding formal
5446 -- was declared with a box, the (instantiations of the) generic
5447 -- formal part are also visible. Otherwise, ignore the entity
5448 -- created to validate the actuals.
5450 if Renamed_Object (E) = Instance then
5453 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5456 -- The visibility of a formal of an enclosing generic is already
5459 elsif Denotes_Formal_Package (E) then
5462 elsif Present (Associated_Formal_Package (E))
5463 and then not Is_Generic_Formal (E)
5465 if Box_Present (Parent (Associated_Formal_Package (E))) then
5466 Check_Generic_Actuals (Renamed_Object (E), True);
5469 Check_Generic_Actuals (Renamed_Object (E), False);
5472 Set_Is_Hidden (E, False);
5475 -- If this is a subprogram instance (in a wrapper package) the
5476 -- actual is fully visible.
5478 elsif Is_Wrapper_Package (Instance) then
5479 Set_Is_Hidden (E, False);
5481 -- If the formal package is declared with a box, or if the formal
5482 -- parameter is defaulted, it is visible in the body.
5485 or else Is_Visible_Formal (E)
5487 Set_Is_Hidden (E, False);
5490 if Ekind (E) = E_Constant then
5492 -- If the type of the actual is a private type declared in the
5493 -- enclosing scope of the generic unit, the body of the generic
5494 -- sees the full view of the type (because it has to appear in
5495 -- the corresponding package body). If the type is private now,
5496 -- exchange views to restore the proper visiblity in the instance.
5499 Typ : constant Entity_Id := Base_Type (Etype (E));
5500 -- The type of the actual
5505 Parent_Scope : Entity_Id;
5506 -- The enclosing scope of the generic unit
5509 if Is_Wrapper_Package (Instance) then
5513 (Unit_Declaration_Node
5514 (Related_Instance (Instance))));
5518 (Specification (Unit_Declaration_Node (Instance)));
5521 Parent_Scope := Scope (Gen_Id);
5523 -- The exchange is only needed if the generic is defined
5524 -- within a package which is not a common ancestor of the
5525 -- scope of the instance, and is not already in scope.
5527 if Is_Private_Type (Typ)
5528 and then Scope (Typ) = Parent_Scope
5529 and then Scope (Instance) /= Parent_Scope
5530 and then Ekind (Parent_Scope) = E_Package
5531 and then not Is_Child_Unit (Gen_Id)
5535 -- If the type of the entity is a subtype, it may also
5536 -- have to be made visible, together with the base type
5537 -- of its full view, after exchange.
5539 if Is_Private_Type (Etype (E)) then
5540 Switch_View (Etype (E));
5541 Switch_View (Base_Type (Etype (E)));
5549 end Check_Generic_Actuals;
5551 ------------------------------
5552 -- Check_Generic_Child_Unit --
5553 ------------------------------
5555 procedure Check_Generic_Child_Unit
5557 Parent_Installed : in out Boolean)
5559 Loc : constant Source_Ptr := Sloc (Gen_Id);
5560 Gen_Par : Entity_Id := Empty;
5562 Inst_Par : Entity_Id;
5565 function Find_Generic_Child
5567 Id : Node_Id) return Entity_Id;
5568 -- Search generic parent for possible child unit with the given name
5570 function In_Enclosing_Instance return Boolean;
5571 -- Within an instance of the parent, the child unit may be denoted
5572 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5573 -- scopes to locate a possible parent instantiation.
5575 ------------------------
5576 -- Find_Generic_Child --
5577 ------------------------
5579 function Find_Generic_Child
5581 Id : Node_Id) return Entity_Id
5586 -- If entity of name is already set, instance has already been
5587 -- resolved, e.g. in an enclosing instantiation.
5589 if Present (Entity (Id)) then
5590 if Scope (Entity (Id)) = Scop then
5597 E := First_Entity (Scop);
5598 while Present (E) loop
5599 if Chars (E) = Chars (Id)
5600 and then Is_Child_Unit (E)
5602 if Is_Child_Unit (E)
5603 and then not Is_Visible_Child_Unit (E)
5606 ("generic child unit& is not visible", Gen_Id, E);
5618 end Find_Generic_Child;
5620 ---------------------------
5621 -- In_Enclosing_Instance --
5622 ---------------------------
5624 function In_Enclosing_Instance return Boolean is
5625 Enclosing_Instance : Node_Id;
5626 Instance_Decl : Node_Id;
5629 -- We do not inline any call that contains instantiations, except
5630 -- for instantiations of Unchecked_Conversion, so if we are within
5631 -- an inlined body the current instance does not require parents.
5633 if In_Inlined_Body then
5634 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5638 -- Loop to check enclosing scopes
5640 Enclosing_Instance := Current_Scope;
5641 while Present (Enclosing_Instance) loop
5642 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5644 if Ekind (Enclosing_Instance) = E_Package
5645 and then Is_Generic_Instance (Enclosing_Instance)
5647 (Generic_Parent (Specification (Instance_Decl)))
5649 -- Check whether the generic we are looking for is a child of
5652 E := Find_Generic_Child
5653 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5654 exit when Present (E);
5660 Enclosing_Instance := Scope (Enclosing_Instance);
5672 Make_Expanded_Name (Loc,
5674 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5675 Selector_Name => New_Occurrence_Of (E, Loc)));
5677 Set_Entity (Gen_Id, E);
5678 Set_Etype (Gen_Id, Etype (E));
5679 Parent_Installed := False; -- Already in scope.
5682 end In_Enclosing_Instance;
5684 -- Start of processing for Check_Generic_Child_Unit
5687 -- If the name of the generic is given by a selected component, it may
5688 -- be the name of a generic child unit, and the prefix is the name of an
5689 -- instance of the parent, in which case the child unit must be visible.
5690 -- If this instance is not in scope, it must be placed there and removed
5691 -- after instantiation, because what is being instantiated is not the
5692 -- original child, but the corresponding child present in the instance
5695 -- If the child is instantiated within the parent, it can be given by
5696 -- a simple name. In this case the instance is already in scope, but
5697 -- the child generic must be recovered from the generic parent as well.
5699 if Nkind (Gen_Id) = N_Selected_Component then
5700 S := Selector_Name (Gen_Id);
5701 Analyze (Prefix (Gen_Id));
5702 Inst_Par := Entity (Prefix (Gen_Id));
5704 if Ekind (Inst_Par) = E_Package
5705 and then Present (Renamed_Object (Inst_Par))
5707 Inst_Par := Renamed_Object (Inst_Par);
5710 if Ekind (Inst_Par) = E_Package then
5711 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5712 Gen_Par := Generic_Parent (Parent (Inst_Par));
5714 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5716 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5718 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5721 elsif Ekind (Inst_Par) = E_Generic_Package
5722 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5724 -- A formal package may be a real child package, and not the
5725 -- implicit instance within a parent. In this case the child is
5726 -- not visible and has to be retrieved explicitly as well.
5728 Gen_Par := Inst_Par;
5731 if Present (Gen_Par) then
5733 -- The prefix denotes an instantiation. The entity itself may be a
5734 -- nested generic, or a child unit.
5736 E := Find_Generic_Child (Gen_Par, S);
5739 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5740 Set_Entity (Gen_Id, E);
5741 Set_Etype (Gen_Id, Etype (E));
5743 Set_Etype (S, Etype (E));
5745 -- Indicate that this is a reference to the parent
5747 if In_Extended_Main_Source_Unit (Gen_Id) then
5748 Set_Is_Instantiated (Inst_Par);
5751 -- A common mistake is to replicate the naming scheme of a
5752 -- hierarchy by instantiating a generic child directly, rather
5753 -- than the implicit child in a parent instance:
5755 -- generic .. package Gpar is ..
5756 -- generic .. package Gpar.Child is ..
5757 -- package Par is new Gpar ();
5760 -- package Par.Child is new Gpar.Child ();
5761 -- rather than Par.Child
5763 -- In this case the instantiation is within Par, which is an
5764 -- instance, but Gpar does not denote Par because we are not IN
5765 -- the instance of Gpar, so this is illegal. The test below
5766 -- recognizes this particular case.
5768 if Is_Child_Unit (E)
5769 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5770 and then (not In_Instance
5771 or else Nkind (Parent (Parent (Gen_Id))) =
5775 ("prefix of generic child unit must be instance of parent",
5779 if not In_Open_Scopes (Inst_Par)
5780 and then Nkind (Parent (Gen_Id)) not in
5781 N_Generic_Renaming_Declaration
5783 Install_Parent (Inst_Par);
5784 Parent_Installed := True;
5786 elsif In_Open_Scopes (Inst_Par) then
5788 -- If the parent is already installed, install the actuals
5789 -- for its formal packages. This is necessary when the
5790 -- child instance is a child of the parent instance:
5791 -- in this case, the parent is placed on the scope stack
5792 -- but the formal packages are not made visible.
5794 Install_Formal_Packages (Inst_Par);
5798 -- If the generic parent does not contain an entity that
5799 -- corresponds to the selector, the instance doesn't either.
5800 -- Analyzing the node will yield the appropriate error message.
5801 -- If the entity is not a child unit, then it is an inner
5802 -- generic in the parent.
5810 if Is_Child_Unit (Entity (Gen_Id))
5812 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5813 and then not In_Open_Scopes (Inst_Par)
5815 Install_Parent (Inst_Par);
5816 Parent_Installed := True;
5818 -- The generic unit may be the renaming of the implicit child
5819 -- present in an instance. In that case the parent instance is
5820 -- obtained from the name of the renamed entity.
5822 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
5823 and then Present (Renamed_Entity (Entity (Gen_Id)))
5824 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
5827 Renamed_Package : constant Node_Id :=
5828 Name (Parent (Entity (Gen_Id)));
5830 if Nkind (Renamed_Package) = N_Expanded_Name then
5831 Inst_Par := Entity (Prefix (Renamed_Package));
5832 Install_Parent (Inst_Par);
5833 Parent_Installed := True;
5839 elsif Nkind (Gen_Id) = N_Expanded_Name then
5841 -- Entity already present, analyze prefix, whose meaning may be
5842 -- an instance in the current context. If it is an instance of
5843 -- a relative within another, the proper parent may still have
5844 -- to be installed, if they are not of the same generation.
5846 Analyze (Prefix (Gen_Id));
5848 -- In the unlikely case that a local declaration hides the name
5849 -- of the parent package, locate it on the homonym chain. If the
5850 -- context is an instance of the parent, the renaming entity is
5853 Inst_Par := Entity (Prefix (Gen_Id));
5854 while Present (Inst_Par)
5855 and then not Is_Package_Or_Generic_Package (Inst_Par)
5857 Inst_Par := Homonym (Inst_Par);
5860 pragma Assert (Present (Inst_Par));
5861 Set_Entity (Prefix (Gen_Id), Inst_Par);
5863 if In_Enclosing_Instance then
5866 elsif Present (Entity (Gen_Id))
5867 and then Is_Child_Unit (Entity (Gen_Id))
5868 and then not In_Open_Scopes (Inst_Par)
5870 Install_Parent (Inst_Par);
5871 Parent_Installed := True;
5874 elsif In_Enclosing_Instance then
5876 -- The child unit is found in some enclosing scope
5883 -- If this is the renaming of the implicit child in a parent
5884 -- instance, recover the parent name and install it.
5886 if Is_Entity_Name (Gen_Id) then
5887 E := Entity (Gen_Id);
5889 if Is_Generic_Unit (E)
5890 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5891 and then Is_Child_Unit (Renamed_Object (E))
5892 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5893 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5896 New_Copy_Tree (Name (Parent (E))));
5897 Inst_Par := Entity (Prefix (Gen_Id));
5899 if not In_Open_Scopes (Inst_Par) then
5900 Install_Parent (Inst_Par);
5901 Parent_Installed := True;
5904 -- If it is a child unit of a non-generic parent, it may be
5905 -- use-visible and given by a direct name. Install parent as
5908 elsif Is_Generic_Unit (E)
5909 and then Is_Child_Unit (E)
5911 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5912 and then not Is_Generic_Unit (Scope (E))
5914 if not In_Open_Scopes (Scope (E)) then
5915 Install_Parent (Scope (E));
5916 Parent_Installed := True;
5921 end Check_Generic_Child_Unit;
5923 -----------------------------
5924 -- Check_Hidden_Child_Unit --
5925 -----------------------------
5927 procedure Check_Hidden_Child_Unit
5929 Gen_Unit : Entity_Id;
5930 Act_Decl_Id : Entity_Id)
5932 Gen_Id : constant Node_Id := Name (N);
5935 if Is_Child_Unit (Gen_Unit)
5936 and then Is_Child_Unit (Act_Decl_Id)
5937 and then Nkind (Gen_Id) = N_Expanded_Name
5938 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5939 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5941 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5943 ("generic unit & is implicitly declared in &",
5944 Defining_Unit_Name (N), Gen_Unit);
5945 Error_Msg_N ("\instance must have different name",
5946 Defining_Unit_Name (N));
5948 end Check_Hidden_Child_Unit;
5950 ------------------------
5951 -- Check_Private_View --
5952 ------------------------
5954 procedure Check_Private_View (N : Node_Id) is
5955 T : constant Entity_Id := Etype (N);
5959 -- Exchange views if the type was not private in the generic but is
5960 -- private at the point of instantiation. Do not exchange views if
5961 -- the scope of the type is in scope. This can happen if both generic
5962 -- and instance are sibling units, or if type is defined in a parent.
5963 -- In this case the visibility of the type will be correct for all
5967 BT := Base_Type (T);
5969 if Is_Private_Type (T)
5970 and then not Has_Private_View (N)
5971 and then Present (Full_View (T))
5972 and then not In_Open_Scopes (Scope (T))
5974 -- In the generic, the full type was visible. Save the private
5975 -- entity, for subsequent exchange.
5979 elsif Has_Private_View (N)
5980 and then not Is_Private_Type (T)
5981 and then not Has_Been_Exchanged (T)
5982 and then Etype (Get_Associated_Node (N)) /= T
5984 -- Only the private declaration was visible in the generic. If
5985 -- the type appears in a subtype declaration, the subtype in the
5986 -- instance must have a view compatible with that of its parent,
5987 -- which must be exchanged (see corresponding code in Restore_
5988 -- Private_Views). Otherwise, if the type is defined in a parent
5989 -- unit, leave full visibility within instance, which is safe.
5991 if In_Open_Scopes (Scope (Base_Type (T)))
5992 and then not Is_Private_Type (Base_Type (T))
5993 and then Comes_From_Source (Base_Type (T))
5997 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5998 or else not In_Private_Part (Scope (Base_Type (T)))
6000 Prepend_Elmt (T, Exchanged_Views);
6001 Exchange_Declarations (Etype (Get_Associated_Node (N)));
6004 -- For composite types with inconsistent representation exchange
6005 -- component types accordingly.
6007 elsif Is_Access_Type (T)
6008 and then Is_Private_Type (Designated_Type (T))
6009 and then not Has_Private_View (N)
6010 and then Present (Full_View (Designated_Type (T)))
6012 Switch_View (Designated_Type (T));
6014 elsif Is_Array_Type (T) then
6015 if Is_Private_Type (Component_Type (T))
6016 and then not Has_Private_View (N)
6017 and then Present (Full_View (Component_Type (T)))
6019 Switch_View (Component_Type (T));
6022 -- The normal exchange mechanism relies on the setting of a
6023 -- flag on the reference in the generic. However, an additional
6024 -- mechanism is needed for types that are not explicitly mentioned
6025 -- in the generic, but may be needed in expanded code in the
6026 -- instance. This includes component types of arrays and
6027 -- designated types of access types. This processing must also
6028 -- include the index types of arrays which we take care of here.
6035 Indx := First_Index (T);
6036 Typ := Base_Type (Etype (Indx));
6037 while Present (Indx) loop
6038 if Is_Private_Type (Typ)
6039 and then Present (Full_View (Typ))
6048 elsif Is_Private_Type (T)
6049 and then Present (Full_View (T))
6050 and then Is_Array_Type (Full_View (T))
6051 and then Is_Private_Type (Component_Type (Full_View (T)))
6055 -- Finally, a non-private subtype may have a private base type, which
6056 -- must be exchanged for consistency. This can happen when a package
6057 -- body is instantiated, when the scope stack is empty but in fact
6058 -- the subtype and the base type are declared in an enclosing scope.
6060 -- Note that in this case we introduce an inconsistency in the view
6061 -- set, because we switch the base type BT, but there could be some
6062 -- private dependent subtypes of BT which remain unswitched. Such
6063 -- subtypes might need to be switched at a later point (see specific
6064 -- provision for that case in Switch_View).
6066 elsif not Is_Private_Type (T)
6067 and then not Has_Private_View (N)
6068 and then Is_Private_Type (BT)
6069 and then Present (Full_View (BT))
6070 and then not Is_Generic_Type (BT)
6071 and then not In_Open_Scopes (BT)
6073 Prepend_Elmt (Full_View (BT), Exchanged_Views);
6074 Exchange_Declarations (BT);
6077 end Check_Private_View;
6079 -----------------------------
6080 -- Check_Hidden_Primitives --
6081 -----------------------------
6083 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is
6086 Result : Elist_Id := No_Elist;
6089 if No (Assoc_List) then
6093 -- Traverse the list of associations between formals and actuals
6094 -- searching for renamings of tagged types
6096 Actual := First (Assoc_List);
6097 while Present (Actual) loop
6098 if Nkind (Actual) = N_Subtype_Declaration then
6099 Gen_T := Generic_Parent_Type (Actual);
6102 and then Is_Tagged_Type (Gen_T)
6104 -- Traverse the list of primitives of the actual types
6105 -- searching for hidden primitives that are visible in the
6106 -- corresponding generic formal; leave them visible and
6107 -- append them to Result to restore their decoration later.
6109 Install_Hidden_Primitives
6110 (Prims_List => Result,
6112 Act_T => Entity (Subtype_Indication (Actual)));
6120 end Check_Hidden_Primitives;
6122 --------------------------
6123 -- Contains_Instance_Of --
6124 --------------------------
6126 function Contains_Instance_Of
6129 N : Node_Id) return Boolean
6137 -- Verify that there are no circular instantiations. We check whether
6138 -- the unit contains an instance of the current scope or some enclosing
6139 -- scope (in case one of the instances appears in a subunit). Longer
6140 -- circularities involving subunits might seem too pathological to
6141 -- consider, but they were not too pathological for the authors of
6142 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
6143 -- enclosing generic scopes as containing an instance.
6146 -- Within a generic subprogram body, the scope is not generic, to
6147 -- allow for recursive subprograms. Use the declaration to determine
6148 -- whether this is a generic unit.
6150 if Ekind (Scop) = E_Generic_Package
6151 or else (Is_Subprogram (Scop)
6152 and then Nkind (Unit_Declaration_Node (Scop)) =
6153 N_Generic_Subprogram_Declaration)
6155 Elmt := First_Elmt (Inner_Instances (Inner));
6157 while Present (Elmt) loop
6158 if Node (Elmt) = Scop then
6159 Error_Msg_Node_2 := Inner;
6161 ("circular Instantiation: & instantiated within &!",
6165 elsif Node (Elmt) = Inner then
6168 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
6169 Error_Msg_Node_2 := Inner;
6171 ("circular Instantiation: & instantiated within &!",
6179 -- Indicate that Inner is being instantiated within Scop
6181 Append_Elmt (Inner, Inner_Instances (Scop));
6184 if Scop = Standard_Standard then
6187 Scop := Scope (Scop);
6192 end Contains_Instance_Of;
6194 -----------------------
6195 -- Copy_Generic_Node --
6196 -----------------------
6198 function Copy_Generic_Node
6200 Parent_Id : Node_Id;
6201 Instantiating : Boolean) return Node_Id
6206 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
6207 -- Check the given value of one of the Fields referenced by the
6208 -- current node to determine whether to copy it recursively. The
6209 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
6210 -- value (Sloc, Uint, Char) in which case it need not be copied.
6212 procedure Copy_Descendants;
6213 -- Common utility for various nodes
6215 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
6216 -- Make copy of element list
6218 function Copy_Generic_List
6220 Parent_Id : Node_Id) return List_Id;
6221 -- Apply Copy_Node recursively to the members of a node list
6223 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
6224 -- True if an identifier is part of the defining program unit name
6225 -- of a child unit. The entity of such an identifier must be kept
6226 -- (for ASIS use) even though as the name of an enclosing generic
6227 -- it would otherwise not be preserved in the generic tree.
6229 ----------------------
6230 -- Copy_Descendants --
6231 ----------------------
6233 procedure Copy_Descendants is
6235 use Atree.Unchecked_Access;
6236 -- This code section is part of the implementation of an untyped
6237 -- tree traversal, so it needs direct access to node fields.
6240 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6241 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6242 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6243 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
6244 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6245 end Copy_Descendants;
6247 -----------------------------
6248 -- Copy_Generic_Descendant --
6249 -----------------------------
6251 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
6253 if D = Union_Id (Empty) then
6256 elsif D in Node_Range then
6258 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
6260 elsif D in List_Range then
6261 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
6263 elsif D in Elist_Range then
6264 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
6266 -- Nothing else is copyable (e.g. Uint values), return as is
6271 end Copy_Generic_Descendant;
6273 ------------------------
6274 -- Copy_Generic_Elist --
6275 ------------------------
6277 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
6284 M := First_Elmt (E);
6285 while Present (M) loop
6287 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6296 end Copy_Generic_Elist;
6298 -----------------------
6299 -- Copy_Generic_List --
6300 -----------------------
6302 function Copy_Generic_List
6304 Parent_Id : Node_Id) return List_Id
6312 Set_Parent (New_L, Parent_Id);
6315 while Present (N) loop
6316 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6325 end Copy_Generic_List;
6327 ---------------------------
6328 -- In_Defining_Unit_Name --
6329 ---------------------------
6331 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6333 return Present (Parent (Nam))
6334 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6336 (Nkind (Parent (Nam)) = N_Expanded_Name
6337 and then In_Defining_Unit_Name (Parent (Nam))));
6338 end In_Defining_Unit_Name;
6340 -- Start of processing for Copy_Generic_Node
6347 New_N := New_Copy (N);
6349 -- Copy aspects if present
6351 if Has_Aspects (N) then
6352 Set_Has_Aspects (New_N, False);
6353 Set_Aspect_Specifications
6354 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6357 if Instantiating then
6358 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6361 if not Is_List_Member (N) then
6362 Set_Parent (New_N, Parent_Id);
6365 -- If defining identifier, then all fields have been copied already
6367 if Nkind (New_N) in N_Entity then
6370 -- Special casing for identifiers and other entity names and operators
6372 elsif Nkind_In (New_N, N_Identifier,
6373 N_Character_Literal,
6376 or else Nkind (New_N) in N_Op
6378 if not Instantiating then
6380 -- Link both nodes in order to assign subsequently the entity of
6381 -- the copy to the original node, in case this is a global
6384 Set_Associated_Node (N, New_N);
6386 -- If we are within an instantiation, this is a nested generic
6387 -- that has already been analyzed at the point of definition. We
6388 -- must preserve references that were global to the enclosing
6389 -- parent at that point. Other occurrences, whether global or
6390 -- local to the current generic, must be resolved anew, so we
6391 -- reset the entity in the generic copy. A global reference has a
6392 -- smaller depth than the parent, or else the same depth in case
6393 -- both are distinct compilation units.
6394 -- A child unit is implicitly declared within the enclosing parent
6395 -- but is in fact global to it, and must be preserved.
6397 -- It is also possible for Current_Instantiated_Parent to be
6398 -- defined, and for this not to be a nested generic, namely if the
6399 -- unit is loaded through Rtsfind. In that case, the entity of
6400 -- New_N is only a link to the associated node, and not a defining
6403 -- The entities for parent units in the defining_program_unit of a
6404 -- generic child unit are established when the context of the unit
6405 -- is first analyzed, before the generic copy is made. They are
6406 -- preserved in the copy for use in ASIS queries.
6408 Ent := Entity (New_N);
6410 if No (Current_Instantiated_Parent.Gen_Id) then
6412 or else Nkind (Ent) /= N_Defining_Identifier
6413 or else not In_Defining_Unit_Name (N)
6415 Set_Associated_Node (New_N, Empty);
6420 not Nkind_In (Ent, N_Defining_Identifier,
6421 N_Defining_Character_Literal,
6422 N_Defining_Operator_Symbol)
6423 or else No (Scope (Ent))
6425 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6426 and then not Is_Child_Unit (Ent))
6428 (Scope_Depth (Scope (Ent)) >
6429 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6431 Get_Source_Unit (Ent) =
6432 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6434 Set_Associated_Node (New_N, Empty);
6437 -- Case of instantiating identifier or some other name or operator
6440 -- If the associated node is still defined, the entity in it is
6441 -- global, and must be copied to the instance. If this copy is
6442 -- being made for a body to inline, it is applied to an
6443 -- instantiated tree, and the entity is already present and must
6444 -- be also preserved.
6447 Assoc : constant Node_Id := Get_Associated_Node (N);
6450 if Present (Assoc) then
6451 if Nkind (Assoc) = Nkind (N) then
6452 Set_Entity (New_N, Entity (Assoc));
6453 Check_Private_View (N);
6455 elsif Nkind (Assoc) = N_Function_Call then
6456 Set_Entity (New_N, Entity (Name (Assoc)));
6458 elsif Nkind_In (Assoc, N_Defining_Identifier,
6459 N_Defining_Character_Literal,
6460 N_Defining_Operator_Symbol)
6461 and then Expander_Active
6463 -- Inlining case: we are copying a tree that contains
6464 -- global entities, which are preserved in the copy to be
6465 -- used for subsequent inlining.
6470 Set_Entity (New_N, Empty);
6476 -- For expanded name, we must copy the Prefix and Selector_Name
6478 if Nkind (N) = N_Expanded_Name then
6480 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6482 Set_Selector_Name (New_N,
6483 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6485 -- For operators, we must copy the right operand
6487 elsif Nkind (N) in N_Op then
6488 Set_Right_Opnd (New_N,
6489 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6491 -- And for binary operators, the left operand as well
6493 if Nkind (N) in N_Binary_Op then
6494 Set_Left_Opnd (New_N,
6495 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6499 -- Special casing for stubs
6501 elsif Nkind (N) in N_Body_Stub then
6503 -- In any case, we must copy the specification or defining
6504 -- identifier as appropriate.
6506 if Nkind (N) = N_Subprogram_Body_Stub then
6507 Set_Specification (New_N,
6508 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6511 Set_Defining_Identifier (New_N,
6513 (Defining_Identifier (N), New_N, Instantiating));
6516 -- If we are not instantiating, then this is where we load and
6517 -- analyze subunits, i.e. at the point where the stub occurs. A
6518 -- more permissive system might defer this analysis to the point
6519 -- of instantiation, but this seems to complicated for now.
6521 if not Instantiating then
6523 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6525 Unum : Unit_Number_Type;
6529 -- Make sure that, if it is a subunit of the main unit that is
6530 -- preprocessed and if -gnateG is specified, the preprocessed
6531 -- file will be written.
6533 Lib.Analysing_Subunit_Of_Main :=
6534 Lib.In_Extended_Main_Source_Unit (N);
6537 (Load_Name => Subunit_Name,
6541 Lib.Analysing_Subunit_Of_Main := False;
6543 -- If the proper body is not found, a warning message will be
6544 -- emitted when analyzing the stub, or later at the point
6545 -- of instantiation. Here we just leave the stub as is.
6547 if Unum = No_Unit then
6548 Subunits_Missing := True;
6549 goto Subunit_Not_Found;
6552 Subunit := Cunit (Unum);
6554 if Nkind (Unit (Subunit)) /= N_Subunit then
6556 ("found child unit instead of expected SEPARATE subunit",
6558 Error_Msg_Sloc := Sloc (N);
6559 Error_Msg_N ("\to complete stub #", Subunit);
6560 goto Subunit_Not_Found;
6563 -- We must create a generic copy of the subunit, in order to
6564 -- perform semantic analysis on it, and we must replace the
6565 -- stub in the original generic unit with the subunit, in order
6566 -- to preserve non-local references within.
6568 -- Only the proper body needs to be copied. Library_Unit and
6569 -- context clause are simply inherited by the generic copy.
6570 -- Note that the copy (which may be recursive if there are
6571 -- nested subunits) must be done first, before attaching it to
6572 -- the enclosing generic.
6576 (Proper_Body (Unit (Subunit)),
6577 Empty, Instantiating => False);
6579 -- Now place the original proper body in the original generic
6580 -- unit. This is a body, not a compilation unit.
6582 Rewrite (N, Proper_Body (Unit (Subunit)));
6583 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6584 Set_Was_Originally_Stub (N);
6586 -- Finally replace the body of the subunit with its copy, and
6587 -- make this new subunit into the library unit of the generic
6588 -- copy, which does not have stubs any longer.
6590 Set_Proper_Body (Unit (Subunit), New_Body);
6591 Set_Library_Unit (New_N, Subunit);
6592 Inherit_Context (Unit (Subunit), N);
6595 -- If we are instantiating, this must be an error case, since
6596 -- otherwise we would have replaced the stub node by the proper body
6597 -- that corresponds. So just ignore it in the copy (i.e. we have
6598 -- copied it, and that is good enough).
6604 <<Subunit_Not_Found>> null;
6606 -- If the node is a compilation unit, it is the subunit of a stub, which
6607 -- has been loaded already (see code below). In this case, the library
6608 -- unit field of N points to the parent unit (which is a compilation
6609 -- unit) and need not (and cannot!) be copied.
6611 -- When the proper body of the stub is analyzed, the library_unit link
6612 -- is used to establish the proper context (see sem_ch10).
6614 -- The other fields of a compilation unit are copied as usual
6616 elsif Nkind (N) = N_Compilation_Unit then
6618 -- This code can only be executed when not instantiating, because in
6619 -- the copy made for an instantiation, the compilation unit node has
6620 -- disappeared at the point that a stub is replaced by its proper
6623 pragma Assert (not Instantiating);
6625 Set_Context_Items (New_N,
6626 Copy_Generic_List (Context_Items (N), New_N));
6629 Copy_Generic_Node (Unit (N), New_N, False));
6631 Set_First_Inlined_Subprogram (New_N,
6633 (First_Inlined_Subprogram (N), New_N, False));
6635 Set_Aux_Decls_Node (New_N,
6636 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6638 -- For an assignment node, the assignment is known to be semantically
6639 -- legal if we are instantiating the template. This avoids incorrect
6640 -- diagnostics in generated code.
6642 elsif Nkind (N) = N_Assignment_Statement then
6644 -- Copy name and expression fields in usual manner
6647 Copy_Generic_Node (Name (N), New_N, Instantiating));
6649 Set_Expression (New_N,
6650 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6652 if Instantiating then
6653 Set_Assignment_OK (Name (New_N), True);
6656 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6657 if not Instantiating then
6658 Set_Associated_Node (N, New_N);
6661 if Present (Get_Associated_Node (N))
6662 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6664 -- In the generic the aggregate has some composite type. If at
6665 -- the point of instantiation the type has a private view,
6666 -- install the full view (and that of its ancestors, if any).
6669 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6674 and then Is_Private_Type (T)
6680 and then Is_Tagged_Type (T)
6681 and then Is_Derived_Type (T)
6683 Rt := Root_Type (T);
6688 if Is_Private_Type (T) then
6699 -- Do not copy the associated node, which points to the generic copy
6700 -- of the aggregate.
6703 use Atree.Unchecked_Access;
6704 -- This code section is part of the implementation of an untyped
6705 -- tree traversal, so it needs direct access to node fields.
6708 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6709 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6710 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6711 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6714 -- Allocators do not have an identifier denoting the access type, so we
6715 -- must locate it through the expression to check whether the views are
6718 elsif Nkind (N) = N_Allocator
6719 and then Nkind (Expression (N)) = N_Qualified_Expression
6720 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6721 and then Instantiating
6724 T : constant Node_Id :=
6725 Get_Associated_Node (Subtype_Mark (Expression (N)));
6731 -- Retrieve the allocator node in the generic copy
6733 Acc_T := Etype (Parent (Parent (T)));
6735 and then Is_Private_Type (Acc_T)
6737 Switch_View (Acc_T);
6744 -- For a proper body, we must catch the case of a proper body that
6745 -- replaces a stub. This represents the point at which a separate
6746 -- compilation unit, and hence template file, may be referenced, so we
6747 -- must make a new source instantiation entry for the template of the
6748 -- subunit, and ensure that all nodes in the subunit are adjusted using
6749 -- this new source instantiation entry.
6751 elsif Nkind (N) in N_Proper_Body then
6753 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6756 if Instantiating and then Was_Originally_Stub (N) then
6757 Create_Instantiation_Source
6758 (Instantiation_Node,
6759 Defining_Entity (N),
6764 -- Now copy the fields of the proper body, using the new
6765 -- adjustment factor if one was needed as per test above.
6769 -- Restore the original adjustment factor in case changed
6771 S_Adjustment := Save_Adjustment;
6774 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6775 -- generic unit, not to the instantiating unit.
6777 elsif Nkind (N) = N_Pragma and then Instantiating then
6779 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6781 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6782 New_N := Make_Null_Statement (Sloc (N));
6789 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
6791 -- No descendant fields need traversing
6795 elsif Nkind (N) = N_String_Literal
6796 and then Present (Etype (N))
6797 and then Instantiating
6799 -- If the string is declared in an outer scope, the string_literal
6800 -- subtype created for it may have the wrong scope. We force the
6801 -- reanalysis of the constant to generate a new itype in the proper
6804 Set_Etype (New_N, Empty);
6805 Set_Analyzed (New_N, False);
6807 -- For the remaining nodes, copy their descendants recursively
6812 if Instantiating and then Nkind (N) = N_Subprogram_Body then
6813 Set_Generic_Parent (Specification (New_N), N);
6815 -- Should preserve Corresponding_Spec??? (12.3(14))
6820 end Copy_Generic_Node;
6822 ----------------------------
6823 -- Denotes_Formal_Package --
6824 ----------------------------
6826 function Denotes_Formal_Package
6828 On_Exit : Boolean := False;
6829 Instance : Entity_Id := Empty) return Boolean
6832 Scop : constant Entity_Id := Scope (Pack);
6835 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6836 -- The package in question may be an actual for a previous formal
6837 -- package P of the current instance, so examine its actuals as well.
6838 -- This must be recursive over other formal packages.
6840 ----------------------------------
6841 -- Is_Actual_Of_Previous_Formal --
6842 ----------------------------------
6844 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6848 E1 := First_Entity (P);
6849 while Present (E1) and then E1 /= Instance loop
6850 if Ekind (E1) = E_Package
6851 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6853 if Renamed_Object (E1) = Pack then
6856 elsif E1 = P or else Renamed_Object (E1) = P then
6859 elsif Is_Actual_Of_Previous_Formal (E1) then
6868 end Is_Actual_Of_Previous_Formal;
6870 -- Start of processing for Denotes_Formal_Package
6876 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6878 Par := Current_Instantiated_Parent.Act_Id;
6881 if Ekind (Scop) = E_Generic_Package
6882 or else Nkind (Unit_Declaration_Node (Scop)) =
6883 N_Generic_Subprogram_Declaration
6887 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6888 N_Formal_Package_Declaration
6896 -- Check whether this package is associated with a formal package of
6897 -- the enclosing instantiation. Iterate over the list of renamings.
6899 E := First_Entity (Par);
6900 while Present (E) loop
6901 if Ekind (E) /= E_Package
6902 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6906 elsif Renamed_Object (E) = Par then
6909 elsif Renamed_Object (E) = Pack then
6912 elsif Is_Actual_Of_Previous_Formal (E) then
6922 end Denotes_Formal_Package;
6928 procedure End_Generic is
6930 -- ??? More things could be factored out in this routine. Should
6931 -- probably be done at a later stage.
6933 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6934 Generic_Flags.Decrement_Last;
6936 Expander_Mode_Restore;
6943 function Earlier (N1, N2 : Node_Id) return Boolean is
6944 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6945 -- Find distance from given node to enclosing compilation unit
6951 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6954 and then Nkind (P) /= N_Compilation_Unit
6956 P := True_Parent (P);
6961 -- Local declarations
6968 -- Start of processing for Earlier
6971 Find_Depth (P1, D1);
6972 Find_Depth (P2, D2);
6982 P1 := True_Parent (P1);
6987 P2 := True_Parent (P2);
6991 -- At this point P1 and P2 are at the same distance from the root.
6992 -- We examine their parents until we find a common declarative list.
6993 -- If we reach the root, N1 and N2 do not descend from the same
6994 -- declarative list (e.g. one is nested in the declarative part and
6995 -- the other is in a block in the statement part) and the earlier
6996 -- one is already frozen.
6998 while not Is_List_Member (P1)
6999 or else not Is_List_Member (P2)
7000 or else List_Containing (P1) /= List_Containing (P2)
7002 P1 := True_Parent (P1);
7003 P2 := True_Parent (P2);
7005 if Nkind (Parent (P1)) = N_Subunit then
7006 P1 := Corresponding_Stub (Parent (P1));
7009 if Nkind (Parent (P2)) = N_Subunit then
7010 P2 := Corresponding_Stub (Parent (P2));
7018 -- Expanded code usually shares the source location of the original
7019 -- construct it was generated for. This however may not necessarely
7020 -- reflect the true location of the code within the tree.
7022 -- Before comparing the slocs of the two nodes, make sure that we are
7023 -- working with correct source locations. Assume that P1 is to the left
7024 -- of P2. If either one does not come from source, traverse the common
7025 -- list heading towards the other node and locate the first source
7029 -- ----+===+===+--------------+===+===+----
7030 -- expanded code expanded code
7032 if not Comes_From_Source (P1) then
7033 while Present (P1) loop
7035 -- Neither P2 nor a source statement were located during the
7036 -- search. If we reach the end of the list, then P1 does not
7037 -- occur earlier than P2.
7040 -- start --- P2 ----- P1 --- end
7042 if No (Next (P1)) then
7045 -- We encounter P2 while going to the right of the list. This
7046 -- means that P1 does indeed appear earlier.
7049 -- start --- P1 ===== P2 --- end
7050 -- expanded code in between
7055 -- No need to look any further since we have located a source
7058 elsif Comes_From_Source (P1) then
7068 if not Comes_From_Source (P2) then
7069 while Present (P2) loop
7071 -- Neither P1 nor a source statement were located during the
7072 -- search. If we reach the start of the list, then P1 does not
7073 -- occur earlier than P2.
7076 -- start --- P2 --- P1 --- end
7078 if No (Prev (P2)) then
7081 -- We encounter P1 while going to the left of the list. This
7082 -- means that P1 does indeed appear earlier.
7085 -- start --- P1 ===== P2 --- end
7086 -- expanded code in between
7091 -- No need to look any further since we have located a source
7094 elsif Comes_From_Source (P2) then
7104 -- At this point either both nodes came from source or we approximated
7105 -- their source locations through neighbouring source statements.
7107 if Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2)) then
7114 ----------------------
7115 -- Find_Actual_Type --
7116 ----------------------
7118 function Find_Actual_Type
7120 Gen_Type : Entity_Id) return Entity_Id
7122 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
7126 -- Special processing only applies to child units
7128 if not Is_Child_Unit (Gen_Scope) then
7129 return Get_Instance_Of (Typ);
7131 -- If designated or component type is itself a formal of the child unit,
7132 -- its instance is available.
7134 elsif Scope (Typ) = Gen_Scope then
7135 return Get_Instance_Of (Typ);
7137 -- If the array or access type is not declared in the parent unit,
7138 -- no special processing needed.
7140 elsif not Is_Generic_Type (Typ)
7141 and then Scope (Gen_Scope) /= Scope (Typ)
7143 return Get_Instance_Of (Typ);
7145 -- Otherwise, retrieve designated or component type by visibility
7148 T := Current_Entity (Typ);
7149 while Present (T) loop
7150 if In_Open_Scopes (Scope (T)) then
7153 elsif Is_Generic_Actual_Type (T) then
7162 end Find_Actual_Type;
7164 ----------------------------
7165 -- Freeze_Subprogram_Body --
7166 ----------------------------
7168 procedure Freeze_Subprogram_Body
7169 (Inst_Node : Node_Id;
7171 Pack_Id : Entity_Id)
7173 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7174 Par : constant Entity_Id := Scope (Gen_Unit);
7180 function Enclosing_Package_Body (N : Node_Id) return Node_Id;
7181 -- Find innermost package body that encloses the given node, and which
7182 -- is not a compilation unit. Freeze nodes for the instance, or for its
7183 -- enclosing body, may be inserted after the enclosing_body of the
7184 -- generic unit. Used to determine proper placement of freeze node for
7185 -- both package and subprogram instances.
7187 function Package_Freeze_Node (B : Node_Id) return Node_Id;
7188 -- Find entity for given package body, and locate or create a freeze
7191 ----------------------------
7192 -- Enclosing_Package_Body --
7193 ----------------------------
7195 function Enclosing_Package_Body (N : Node_Id) return Node_Id is
7201 and then Nkind (Parent (P)) /= N_Compilation_Unit
7203 if Nkind (P) = N_Package_Body then
7204 if Nkind (Parent (P)) = N_Subunit then
7205 return Corresponding_Stub (Parent (P));
7211 P := True_Parent (P);
7215 end Enclosing_Package_Body;
7217 -------------------------
7218 -- Package_Freeze_Node --
7219 -------------------------
7221 function Package_Freeze_Node (B : Node_Id) return Node_Id is
7225 if Nkind (B) = N_Package_Body then
7226 Id := Corresponding_Spec (B);
7227 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
7228 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
7231 Ensure_Freeze_Node (Id);
7232 return Freeze_Node (Id);
7233 end Package_Freeze_Node;
7235 -- Start of processing of Freeze_Subprogram_Body
7238 -- If the instance and the generic body appear within the same unit, and
7239 -- the instance precedes the generic, the freeze node for the instance
7240 -- must appear after that of the generic. If the generic is nested
7241 -- within another instance I2, then current instance must be frozen
7242 -- after I2. In both cases, the freeze nodes are those of enclosing
7243 -- packages. Otherwise, the freeze node is placed at the end of the
7244 -- current declarative part.
7246 Enc_G := Enclosing_Package_Body (Gen_Body);
7247 Enc_I := Enclosing_Package_Body (Inst_Node);
7248 Ensure_Freeze_Node (Pack_Id);
7249 F_Node := Freeze_Node (Pack_Id);
7251 if Is_Generic_Instance (Par)
7252 and then Present (Freeze_Node (Par))
7253 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
7255 -- The parent was a premature instantiation. Insert freeze node at
7256 -- the end the current declarative part.
7258 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
7259 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7261 -- Handle the following case:
7263 -- package Parent_Inst is new ...
7266 -- procedure P ... -- this body freezes Parent_Inst
7268 -- package Inst is new ...
7270 -- In this particular scenario, the freeze node for Inst must be
7271 -- inserted in the same manner as that of Parent_Inst - before the
7272 -- next source body or at the end of the declarative list (body not
7273 -- available). If body P did not exist and Parent_Inst was frozen
7274 -- after Inst, either by a body following Inst or at the end of the
7275 -- declarative region, the freeze node for Inst must be inserted
7276 -- after that of Parent_Inst. This relation is established by
7277 -- comparing the Slocs of Parent_Inst freeze node and Inst.
7279 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
7280 List_Containing (Inst_Node)
7281 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
7283 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7286 Insert_After (Freeze_Node (Par), F_Node);
7289 -- The body enclosing the instance should be frozen after the body that
7290 -- includes the generic, because the body of the instance may make
7291 -- references to entities therein. If the two are not in the same
7292 -- declarative part, or if the one enclosing the instance is frozen
7293 -- already, freeze the instance at the end of the current declarative
7296 elsif Is_Generic_Instance (Par)
7297 and then Present (Freeze_Node (Par))
7298 and then Present (Enc_I)
7300 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
7302 (Nkind (Enc_I) = N_Package_Body
7304 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
7306 -- The enclosing package may contain several instances. Rather
7307 -- than computing the earliest point at which to insert its freeze
7308 -- node, we place it at the end of the declarative part of the
7309 -- parent of the generic.
7311 Insert_Freeze_Node_For_Instance
7312 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
7315 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7317 elsif Present (Enc_G)
7318 and then Present (Enc_I)
7319 and then Enc_G /= Enc_I
7320 and then Earlier (Inst_Node, Gen_Body)
7322 if Nkind (Enc_G) = N_Package_Body then
7323 E_G_Id := Corresponding_Spec (Enc_G);
7324 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
7326 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
7329 -- Freeze package that encloses instance, and place node after
7330 -- package that encloses generic. If enclosing package is already
7331 -- frozen we have to assume it is at the proper place. This may be a
7332 -- potential ABE that requires dynamic checking. Do not add a freeze
7333 -- node if the package that encloses the generic is inside the body
7334 -- that encloses the instance, because the freeze node would be in
7335 -- the wrong scope. Additional contortions needed if the bodies are
7336 -- within a subunit.
7339 Enclosing_Body : Node_Id;
7342 if Nkind (Enc_I) = N_Package_Body_Stub then
7343 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
7345 Enclosing_Body := Enc_I;
7348 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
7349 Insert_Freeze_Node_For_Instance
7350 (Enc_G, Package_Freeze_Node (Enc_I));
7354 -- Freeze enclosing subunit before instance
7356 Ensure_Freeze_Node (E_G_Id);
7358 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7359 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7362 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7365 -- If none of the above, insert freeze node at the end of the current
7366 -- declarative part.
7368 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7370 end Freeze_Subprogram_Body;
7376 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7378 return Generic_Renamings.Table (E).Gen_Id;
7381 ---------------------
7382 -- Get_Instance_Of --
7383 ---------------------
7385 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7386 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7389 if Res /= Assoc_Null then
7390 return Generic_Renamings.Table (Res).Act_Id;
7392 -- On exit, entity is not instantiated: not a generic parameter, or
7393 -- else parameter of an inner generic unit.
7397 end Get_Instance_Of;
7399 ------------------------------------
7400 -- Get_Package_Instantiation_Node --
7401 ------------------------------------
7403 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7404 Decl : Node_Id := Unit_Declaration_Node (A);
7408 -- If the Package_Instantiation attribute has been set on the package
7409 -- entity, then use it directly when it (or its Original_Node) refers
7410 -- to an N_Package_Instantiation node. In principle it should be
7411 -- possible to have this field set in all cases, which should be
7412 -- investigated, and would allow this function to be significantly
7415 Inst := Package_Instantiation (A);
7417 if Present (Inst) then
7418 if Nkind (Inst) = N_Package_Instantiation then
7421 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7422 return Original_Node (Inst);
7426 -- If the instantiation is a compilation unit that does not need body
7427 -- then the instantiation node has been rewritten as a package
7428 -- declaration for the instance, and we return the original node.
7430 -- If it is a compilation unit and the instance node has not been
7431 -- rewritten, then it is still the unit of the compilation. Finally, if
7432 -- a body is present, this is a parent of the main unit whose body has
7433 -- been compiled for inlining purposes, and the instantiation node has
7434 -- been rewritten with the instance body.
7436 -- Otherwise the instantiation node appears after the declaration. If
7437 -- the entity is a formal package, the declaration may have been
7438 -- rewritten as a generic declaration (in the case of a formal with box)
7439 -- or left as a formal package declaration if it has actuals, and is
7440 -- found with a forward search.
7442 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7443 if Nkind (Decl) = N_Package_Declaration
7444 and then Present (Corresponding_Body (Decl))
7446 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7449 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7450 return Original_Node (Decl);
7452 return Unit (Parent (Decl));
7455 elsif Nkind (Decl) = N_Package_Declaration
7456 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7458 return Original_Node (Decl);
7461 Inst := Next (Decl);
7462 while not Nkind_In (Inst, N_Package_Instantiation,
7463 N_Formal_Package_Declaration)
7470 end Get_Package_Instantiation_Node;
7472 ------------------------
7473 -- Has_Been_Exchanged --
7474 ------------------------
7476 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7480 Next := First_Elmt (Exchanged_Views);
7481 while Present (Next) loop
7482 if Full_View (Node (Next)) = E then
7490 end Has_Been_Exchanged;
7496 function Hash (F : Entity_Id) return HTable_Range is
7498 return HTable_Range (F mod HTable_Size);
7501 ------------------------
7502 -- Hide_Current_Scope --
7503 ------------------------
7505 procedure Hide_Current_Scope is
7506 C : constant Entity_Id := Current_Scope;
7510 Set_Is_Hidden_Open_Scope (C);
7512 E := First_Entity (C);
7513 while Present (E) loop
7514 if Is_Immediately_Visible (E) then
7515 Set_Is_Immediately_Visible (E, False);
7516 Append_Elmt (E, Hidden_Entities);
7522 -- Make the scope name invisible as well. This is necessary, but might
7523 -- conflict with calls to Rtsfind later on, in case the scope is a
7524 -- predefined one. There is no clean solution to this problem, so for
7525 -- now we depend on the user not redefining Standard itself in one of
7526 -- the parent units.
7528 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7529 Set_Is_Immediately_Visible (C, False);
7530 Append_Elmt (C, Hidden_Entities);
7533 end Hide_Current_Scope;
7539 procedure Init_Env is
7540 Saved : Instance_Env;
7543 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7544 Saved.Exchanged_Views := Exchanged_Views;
7545 Saved.Hidden_Entities := Hidden_Entities;
7546 Saved.Current_Sem_Unit := Current_Sem_Unit;
7547 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7548 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7550 -- Save configuration switches. These may be reset if the unit is a
7551 -- predefined unit, and the current mode is not Ada 2005.
7553 Save_Opt_Config_Switches (Saved.Switches);
7555 Instance_Envs.Append (Saved);
7557 Exchanged_Views := New_Elmt_List;
7558 Hidden_Entities := New_Elmt_List;
7560 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7561 -- this is set properly in Set_Instance_Env.
7563 Current_Instantiated_Parent :=
7564 (Current_Scope, Current_Scope, Assoc_Null);
7567 ------------------------------
7568 -- In_Same_Declarative_Part --
7569 ------------------------------
7571 function In_Same_Declarative_Part
7573 Inst : Node_Id) return Boolean
7575 Decls : constant Node_Id := Parent (F_Node);
7576 Nod : Node_Id := Parent (Inst);
7579 while Present (Nod) loop
7583 elsif Nkind_In (Nod, N_Subprogram_Body,
7585 N_Package_Declaration,
7592 elsif Nkind (Nod) = N_Subunit then
7593 Nod := Corresponding_Stub (Nod);
7595 elsif Nkind (Nod) = N_Compilation_Unit then
7599 Nod := Parent (Nod);
7604 end In_Same_Declarative_Part;
7606 ---------------------
7607 -- In_Main_Context --
7608 ---------------------
7610 function In_Main_Context (E : Entity_Id) return Boolean is
7616 if not Is_Compilation_Unit (E)
7617 or else Ekind (E) /= E_Package
7618 or else In_Private_Part (E)
7623 Context := Context_Items (Cunit (Main_Unit));
7625 Clause := First (Context);
7626 while Present (Clause) loop
7627 if Nkind (Clause) = N_With_Clause then
7628 Nam := Name (Clause);
7630 -- If the current scope is part of the context of the main unit,
7631 -- analysis of the corresponding with_clause is not complete, and
7632 -- the entity is not set. We use the Chars field directly, which
7633 -- might produce false positives in rare cases, but guarantees
7634 -- that we produce all the instance bodies we will need.
7636 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7637 or else (Nkind (Nam) = N_Selected_Component
7638 and then Chars (Selector_Name (Nam)) = Chars (E))
7648 end In_Main_Context;
7650 ---------------------
7651 -- Inherit_Context --
7652 ---------------------
7654 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7655 Current_Context : List_Id;
7656 Current_Unit : Node_Id;
7661 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7663 -- The inherited context is attached to the enclosing compilation
7664 -- unit. This is either the main unit, or the declaration for the
7665 -- main unit (in case the instantiation appears within the package
7666 -- declaration and the main unit is its body).
7668 Current_Unit := Parent (Inst);
7669 while Present (Current_Unit)
7670 and then Nkind (Current_Unit) /= N_Compilation_Unit
7672 Current_Unit := Parent (Current_Unit);
7675 Current_Context := Context_Items (Current_Unit);
7677 Item := First (Context_Items (Parent (Gen_Decl)));
7678 while Present (Item) loop
7679 if Nkind (Item) = N_With_Clause then
7681 -- Take care to prevent direct cyclic with's, which can happen
7682 -- if the generic body with's the current unit. Such a case
7683 -- would result in binder errors (or run-time errors if the
7684 -- -gnatE switch is in effect), but we want to prevent it here,
7685 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7686 -- that we don't bother to detect indirect cycles.
7688 if Library_Unit (Item) /= Current_Unit then
7689 New_I := New_Copy (Item);
7690 Set_Implicit_With (New_I, True);
7691 Append (New_I, Current_Context);
7698 end Inherit_Context;
7704 procedure Initialize is
7706 Generic_Renamings.Init;
7709 Generic_Renamings_HTable.Reset;
7710 Circularity_Detected := False;
7711 Exchanged_Views := No_Elist;
7712 Hidden_Entities := No_Elist;
7715 -------------------------------------
7716 -- Insert_Freeze_Node_For_Instance --
7717 -------------------------------------
7719 procedure Insert_Freeze_Node_For_Instance
7723 Inst : constant Entity_Id := Entity (F_Node);
7728 function Enclosing_Body (N : Node_Id) return Node_Id;
7729 -- Find enclosing package or subprogram body, if any. Freeze node
7730 -- may be placed at end of current declarative list if previous
7731 -- instance and current one have different enclosing bodies.
7733 function Previous_Instance (Gen : Entity_Id) return Entity_Id;
7734 -- Find the local instance, if any, that declares the generic that is
7735 -- being instantiated. If present, the freeze node for this instance
7736 -- must follow the freeze node for the previous instance.
7738 --------------------
7739 -- Enclosing_Body --
7740 --------------------
7742 function Enclosing_Body (N : Node_Id) return Node_Id is
7748 and then Nkind (Parent (P)) /= N_Compilation_Unit
7750 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then
7751 if Nkind (Parent (P)) = N_Subunit then
7752 return Corresponding_Stub (Parent (P));
7758 P := True_Parent (P);
7764 -----------------------
7765 -- Previous_Instance --
7766 -----------------------
7768 function Previous_Instance (Gen : Entity_Id) return Entity_Id is
7774 and then S /= Standard_Standard
7776 if Is_Generic_Instance (S)
7777 and then In_Same_Source_Unit (S, N)
7786 end Previous_Instance;
7788 -- Start of processing for Insert_Freeze_Node_For_Instance
7791 if not Is_List_Member (F_Node) then
7792 Decls := List_Containing (N);
7793 Par_N := Parent (Decls);
7796 -- If this is a package instance, check whether the generic is
7797 -- declared in a previous instance and the current instance is
7798 -- not within the previous one.
7800 if Present (Generic_Parent (Parent (Inst)))
7801 and then Is_In_Main_Unit (N)
7804 Enclosing_N : constant Node_Id := Enclosing_Body (N);
7805 Par_I : constant Entity_Id :=
7807 (Generic_Parent (Parent (Inst)));
7812 and then Earlier (N, Freeze_Node (Par_I))
7814 Scop := Scope (Inst);
7816 -- If the current instance is within the one that contains
7817 -- the generic, the freeze node for the current one must
7818 -- appear in the current declarative part. Ditto, if the
7819 -- current instance is within another package instance or
7820 -- within a body that does not enclose the current instance.
7821 -- In these three cases the freeze node of the previous
7822 -- instance is not relevant.
7824 while Present (Scop)
7825 and then Scop /= Standard_Standard
7827 exit when Scop = Par_I
7829 (Is_Generic_Instance (Scop)
7830 and then Scope_Depth (Scop) > Scope_Depth (Par_I));
7831 Scop := Scope (Scop);
7834 -- Previous instance encloses current instance
7836 if Scop = Par_I then
7839 -- If the next node is a source body we must freeze in
7840 -- the current scope as well.
7842 elsif Present (Next (N))
7843 and then Nkind_In (Next (N),
7844 N_Subprogram_Body, N_Package_Body)
7845 and then Comes_From_Source (Next (N))
7849 -- Current instance is within an unrelated instance
7851 elsif Is_Generic_Instance (Scop) then
7854 -- Current instance is within an unrelated body
7856 elsif Present (Enclosing_N)
7857 and then Enclosing_N /= Enclosing_Body (Par_I)
7862 Insert_After (Freeze_Node (Par_I), F_Node);
7869 -- When the instantiation occurs in a package declaration, append the
7870 -- freeze node to the private declarations (if any).
7872 if Nkind (Par_N) = N_Package_Specification
7873 and then Decls = Visible_Declarations (Par_N)
7874 and then Present (Private_Declarations (Par_N))
7875 and then not Is_Empty_List (Private_Declarations (Par_N))
7877 Decls := Private_Declarations (Par_N);
7878 Decl := First (Decls);
7881 -- Determine the proper freeze point of a package instantiation. We
7882 -- adhere to the general rule of a package or subprogram body causing
7883 -- freezing of anything before it in the same declarative region. In
7884 -- this case, the proper freeze point of a package instantiation is
7885 -- before the first source body which follows, or before a stub. This
7886 -- ensures that entities coming from the instance are already frozen
7887 -- and usable in source bodies.
7889 if Nkind (Par_N) /= N_Package_Declaration
7890 and then Ekind (Inst) = E_Package
7891 and then Is_Generic_Instance (Inst)
7893 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
7895 while Present (Decl) loop
7896 if (Nkind (Decl) in N_Unit_Body
7898 Nkind (Decl) in N_Body_Stub)
7899 and then Comes_From_Source (Decl)
7901 Insert_Before (Decl, F_Node);
7909 -- In a package declaration, or if no previous body, insert at end
7912 Set_Sloc (F_Node, Sloc (Last (Decls)));
7913 Insert_After (Last (Decls), F_Node);
7915 end Insert_Freeze_Node_For_Instance;
7921 procedure Install_Body
7922 (Act_Body : Node_Id;
7927 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
7928 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
7929 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
7930 Par : constant Entity_Id := Scope (Gen_Id);
7931 Gen_Unit : constant Node_Id :=
7932 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
7933 Orig_Body : Node_Id := Gen_Body;
7935 Body_Unit : Node_Id;
7937 Must_Delay : Boolean;
7939 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
7940 -- Find subprogram (if any) that encloses instance and/or generic body
7942 function True_Sloc (N : Node_Id) return Source_Ptr;
7943 -- If the instance is nested inside a generic unit, the Sloc of the
7944 -- instance indicates the place of the original definition, not the
7945 -- point of the current enclosing instance. Pending a better usage of
7946 -- Slocs to indicate instantiation places, we determine the place of
7947 -- origin of a node by finding the maximum sloc of any ancestor node.
7948 -- Why is this not equivalent to Top_Level_Location ???
7950 --------------------
7951 -- Enclosing_Subp --
7952 --------------------
7954 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
7959 while Scop /= Standard_Standard
7960 and then not Is_Overloadable (Scop)
7962 Scop := Scope (Scop);
7972 function True_Sloc (N : Node_Id) return Source_Ptr is
7979 while Present (N1) and then N1 /= Act_Unit loop
7980 if Sloc (N1) > Res then
7990 -- Start of processing for Install_Body
7993 -- If the body is a subunit, the freeze point is the corresponding stub
7994 -- in the current compilation, not the subunit itself.
7996 if Nkind (Parent (Gen_Body)) = N_Subunit then
7997 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
7999 Orig_Body := Gen_Body;
8002 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
8004 -- If the instantiation and the generic definition appear in the same
8005 -- package declaration, this is an early instantiation. If they appear
8006 -- in the same declarative part, it is an early instantiation only if
8007 -- the generic body appears textually later, and the generic body is
8008 -- also in the main unit.
8010 -- If instance is nested within a subprogram, and the generic body is
8011 -- not, the instance is delayed because the enclosing body is. If
8012 -- instance and body are within the same scope, or the same sub-
8013 -- program body, indicate explicitly that the instance is delayed.
8016 (Gen_Unit = Act_Unit
8017 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
8018 N_Generic_Package_Declaration)
8019 or else (Gen_Unit = Body_Unit
8020 and then True_Sloc (N) < Sloc (Orig_Body)))
8021 and then Is_In_Main_Unit (Gen_Unit)
8022 and then (Scope (Act_Id) = Scope (Gen_Id)
8024 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
8026 -- If this is an early instantiation, the freeze node is placed after
8027 -- the generic body. Otherwise, if the generic appears in an instance,
8028 -- we cannot freeze the current instance until the outer one is frozen.
8029 -- This is only relevant if the current instance is nested within some
8030 -- inner scope not itself within the outer instance. If this scope is
8031 -- a package body in the same declarative part as the outer instance,
8032 -- then that body needs to be frozen after the outer instance. Finally,
8033 -- if no delay is needed, we place the freeze node at the end of the
8034 -- current declarative part.
8036 if Expander_Active then
8037 Ensure_Freeze_Node (Act_Id);
8038 F_Node := Freeze_Node (Act_Id);
8041 Insert_After (Orig_Body, F_Node);
8043 elsif Is_Generic_Instance (Par)
8044 and then Present (Freeze_Node (Par))
8045 and then Scope (Act_Id) /= Par
8047 -- Freeze instance of inner generic after instance of enclosing
8050 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
8052 -- Handle the following case:
8054 -- package Parent_Inst is new ...
8057 -- procedure P ... -- this body freezes Parent_Inst
8059 -- package Inst is new ...
8061 -- In this particular scenario, the freeze node for Inst must
8062 -- be inserted in the same manner as that of Parent_Inst -
8063 -- before the next source body or at the end of the declarative
8064 -- list (body not available). If body P did not exist and
8065 -- Parent_Inst was frozen after Inst, either by a body
8066 -- following Inst or at the end of the declarative region, the
8067 -- freeze node for Inst must be inserted after that of
8068 -- Parent_Inst. This relation is established by comparing the
8069 -- Slocs of Parent_Inst freeze node and Inst.
8071 if List_Containing (Get_Package_Instantiation_Node (Par)) =
8073 and then Sloc (Freeze_Node (Par)) < Sloc (N)
8075 Insert_Freeze_Node_For_Instance (N, F_Node);
8077 Insert_After (Freeze_Node (Par), F_Node);
8080 -- Freeze package enclosing instance of inner generic after
8081 -- instance of enclosing generic.
8083 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body)
8084 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
8087 Enclosing : Entity_Id;
8090 Enclosing := Corresponding_Spec (Parent (N));
8092 if No (Enclosing) then
8093 Enclosing := Defining_Entity (Parent (N));
8096 Insert_Freeze_Node_For_Instance (N, F_Node);
8097 Ensure_Freeze_Node (Enclosing);
8099 if not Is_List_Member (Freeze_Node (Enclosing)) then
8101 -- The enclosing context is a subunit, insert the freeze
8102 -- node after the stub.
8104 if Nkind (Parent (Parent (N))) = N_Subunit then
8105 Insert_Freeze_Node_For_Instance
8106 (Corresponding_Stub (Parent (Parent (N))),
8107 Freeze_Node (Enclosing));
8109 -- The enclosing context is a package with a stub body
8110 -- which has already been replaced by the real body.
8111 -- Insert the freeze node after the actual body.
8113 elsif Ekind (Enclosing) = E_Package
8114 and then Present (Body_Entity (Enclosing))
8115 and then Was_Originally_Stub
8116 (Parent (Body_Entity (Enclosing)))
8118 Insert_Freeze_Node_For_Instance
8119 (Parent (Body_Entity (Enclosing)),
8120 Freeze_Node (Enclosing));
8122 -- The parent instance has been frozen before the body of
8123 -- the enclosing package, insert the freeze node after
8126 elsif List_Containing (Freeze_Node (Par)) =
8127 List_Containing (Parent (N))
8128 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
8130 Insert_Freeze_Node_For_Instance
8131 (Parent (N), Freeze_Node (Enclosing));
8135 (Freeze_Node (Par), Freeze_Node (Enclosing));
8141 Insert_Freeze_Node_For_Instance (N, F_Node);
8145 Insert_Freeze_Node_For_Instance (N, F_Node);
8149 Set_Is_Frozen (Act_Id);
8150 Insert_Before (N, Act_Body);
8151 Mark_Rewrite_Insertion (Act_Body);
8154 -----------------------------
8155 -- Install_Formal_Packages --
8156 -----------------------------
8158 procedure Install_Formal_Packages (Par : Entity_Id) is
8161 Gen_E : Entity_Id := Empty;
8164 E := First_Entity (Par);
8166 -- If we are installing an instance parent, locate the formal packages
8167 -- of its generic parent.
8169 if Is_Generic_Instance (Par) then
8170 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
8171 Gen_E := First_Entity (Gen);
8174 while Present (E) loop
8175 if Ekind (E) = E_Package
8176 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
8178 -- If this is the renaming for the parent instance, done
8180 if Renamed_Object (E) = Par then
8183 -- The visibility of a formal of an enclosing generic is already
8186 elsif Denotes_Formal_Package (E) then
8189 elsif Present (Associated_Formal_Package (E)) then
8190 Check_Generic_Actuals (Renamed_Object (E), True);
8191 Set_Is_Hidden (E, False);
8193 -- Find formal package in generic unit that corresponds to
8194 -- (instance of) formal package in instance.
8196 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
8197 Next_Entity (Gen_E);
8200 if Present (Gen_E) then
8201 Map_Formal_Package_Entities (Gen_E, E);
8207 if Present (Gen_E) then
8208 Next_Entity (Gen_E);
8211 end Install_Formal_Packages;
8213 --------------------
8214 -- Install_Parent --
8215 --------------------
8217 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
8218 Ancestors : constant Elist_Id := New_Elmt_List;
8219 S : constant Entity_Id := Current_Scope;
8220 Inst_Par : Entity_Id;
8221 First_Par : Entity_Id;
8222 Inst_Node : Node_Id;
8223 Gen_Par : Entity_Id;
8224 First_Gen : Entity_Id;
8227 procedure Install_Noninstance_Specs (Par : Entity_Id);
8228 -- Install the scopes of noninstance parent units ending with Par
8230 procedure Install_Spec (Par : Entity_Id);
8231 -- The child unit is within the declarative part of the parent, so
8232 -- the declarations within the parent are immediately visible.
8234 -------------------------------
8235 -- Install_Noninstance_Specs --
8236 -------------------------------
8238 procedure Install_Noninstance_Specs (Par : Entity_Id) is
8241 and then Par /= Standard_Standard
8242 and then not In_Open_Scopes (Par)
8244 Install_Noninstance_Specs (Scope (Par));
8247 end Install_Noninstance_Specs;
8253 procedure Install_Spec (Par : Entity_Id) is
8254 Spec : constant Node_Id :=
8255 Specification (Unit_Declaration_Node (Par));
8258 -- If this parent of the child instance is a top-level unit,
8259 -- then record the unit and its visibility for later resetting
8260 -- in Remove_Parent. We exclude units that are generic instances,
8261 -- as we only want to record this information for the ultimate
8262 -- top-level noninstance parent (is that always correct???).
8264 if Scope (Par) = Standard_Standard
8265 and then not Is_Generic_Instance (Par)
8267 Parent_Unit_Visible := Is_Immediately_Visible (Par);
8268 Instance_Parent_Unit := Par;
8271 -- Open the parent scope and make it and its declarations visible.
8272 -- If this point is not within a body, then only the visible
8273 -- declarations should be made visible, and installation of the
8274 -- private declarations is deferred until the appropriate point
8275 -- within analysis of the spec being instantiated (see the handling
8276 -- of parent visibility in Analyze_Package_Specification). This is
8277 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
8278 -- private view problems that occur when compiling instantiations of
8279 -- a generic child of that package (Generic_Dispatching_Constructor).
8280 -- If the instance freezes a tagged type, inlinings of operations
8281 -- from Ada.Tags may need the full view of type Tag. If inlining took
8282 -- proper account of establishing visibility of inlined subprograms'
8283 -- parents then it should be possible to remove this
8284 -- special check. ???
8287 Set_Is_Immediately_Visible (Par);
8288 Install_Visible_Declarations (Par);
8289 Set_Use (Visible_Declarations (Spec));
8291 if In_Body or else Is_RTU (Par, Ada_Tags) then
8292 Install_Private_Declarations (Par);
8293 Set_Use (Private_Declarations (Spec));
8297 -- Start of processing for Install_Parent
8300 -- We need to install the parent instance to compile the instantiation
8301 -- of the child, but the child instance must appear in the current
8302 -- scope. Given that we cannot place the parent above the current scope
8303 -- in the scope stack, we duplicate the current scope and unstack both
8304 -- after the instantiation is complete.
8306 -- If the parent is itself the instantiation of a child unit, we must
8307 -- also stack the instantiation of its parent, and so on. Each such
8308 -- ancestor is the prefix of the name in a prior instantiation.
8310 -- If this is a nested instance, the parent unit itself resolves to
8311 -- a renaming of the parent instance, whose declaration we need.
8313 -- Finally, the parent may be a generic (not an instance) when the
8314 -- child unit appears as a formal package.
8318 if Present (Renamed_Entity (Inst_Par)) then
8319 Inst_Par := Renamed_Entity (Inst_Par);
8322 First_Par := Inst_Par;
8325 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
8327 First_Gen := Gen_Par;
8329 while Present (Gen_Par)
8330 and then Is_Child_Unit (Gen_Par)
8332 -- Load grandparent instance as well
8334 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
8336 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
8337 Inst_Par := Entity (Prefix (Name (Inst_Node)));
8339 if Present (Renamed_Entity (Inst_Par)) then
8340 Inst_Par := Renamed_Entity (Inst_Par);
8345 (Specification (Unit_Declaration_Node (Inst_Par)));
8347 if Present (Gen_Par) then
8348 Prepend_Elmt (Inst_Par, Ancestors);
8351 -- Parent is not the name of an instantiation
8353 Install_Noninstance_Specs (Inst_Par);
8364 if Present (First_Gen) then
8365 Append_Elmt (First_Par, Ancestors);
8367 Install_Noninstance_Specs (First_Par);
8370 if not Is_Empty_Elmt_List (Ancestors) then
8371 Elmt := First_Elmt (Ancestors);
8372 while Present (Elmt) loop
8373 Install_Spec (Node (Elmt));
8374 Install_Formal_Packages (Node (Elmt));
8384 -------------------------------
8385 -- Install_Hidden_Primitives --
8386 -------------------------------
8388 procedure Install_Hidden_Primitives
8389 (Prims_List : in out Elist_Id;
8394 List : Elist_Id := No_Elist;
8395 Prim_G_Elmt : Elmt_Id;
8396 Prim_A_Elmt : Elmt_Id;
8401 -- No action needed in case of serious errors because we cannot trust
8402 -- in the order of primitives
8404 if Serious_Errors_Detected > 0 then
8407 -- No action possible if we don't have available the list of primitive
8411 or else not Is_Record_Type (Gen_T)
8412 or else not Is_Tagged_Type (Gen_T)
8413 or else not Is_Record_Type (Act_T)
8414 or else not Is_Tagged_Type (Act_T)
8418 -- There is no need to handle interface types since their primitives
8421 elsif Is_Interface (Gen_T) then
8425 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T));
8427 if not Is_Class_Wide_Type (Act_T) then
8428 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T));
8430 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T)));
8434 -- Skip predefined primitives in the generic formal
8436 while Present (Prim_G_Elmt)
8437 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt))
8439 Next_Elmt (Prim_G_Elmt);
8442 -- Skip predefined primitives in the generic actual
8444 while Present (Prim_A_Elmt)
8445 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt))
8447 Next_Elmt (Prim_A_Elmt);
8450 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt);
8452 Prim_G := Node (Prim_G_Elmt);
8453 Prim_A := Node (Prim_A_Elmt);
8455 -- There is no need to handle interface primitives because their
8456 -- primitives are not hidden
8458 exit when Present (Interface_Alias (Prim_G));
8460 -- Here we install one hidden primitive
8462 if Chars (Prim_G) /= Chars (Prim_A)
8463 and then Has_Suffix (Prim_A, 'P')
8464 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G)
8466 Set_Chars (Prim_A, Chars (Prim_G));
8468 if List = No_Elist then
8469 List := New_Elmt_List;
8472 Append_Elmt (Prim_A, List);
8475 Next_Elmt (Prim_A_Elmt);
8476 Next_Elmt (Prim_G_Elmt);
8479 -- Append the elements to the list of temporarily visible primitives
8480 -- avoiding duplicates.
8482 if Present (List) then
8483 if No (Prims_List) then
8484 Prims_List := New_Elmt_List;
8487 Elmt := First_Elmt (List);
8488 while Present (Elmt) loop
8489 Append_Unique_Elmt (Node (Elmt), Prims_List);
8493 end Install_Hidden_Primitives;
8495 -------------------------------
8496 -- Restore_Hidden_Primitives --
8497 -------------------------------
8499 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is
8500 Prim_Elmt : Elmt_Id;
8504 if Prims_List /= No_Elist then
8505 Prim_Elmt := First_Elmt (Prims_List);
8506 while Present (Prim_Elmt) loop
8507 Prim := Node (Prim_Elmt);
8508 Set_Chars (Prim, Add_Suffix (Prim, 'P'));
8509 Next_Elmt (Prim_Elmt);
8512 Prims_List := No_Elist;
8514 end Restore_Hidden_Primitives;
8516 --------------------------------
8517 -- Instantiate_Formal_Package --
8518 --------------------------------
8520 function Instantiate_Formal_Package
8523 Analyzed_Formal : Node_Id) return List_Id
8525 Loc : constant Source_Ptr := Sloc (Actual);
8526 Actual_Pack : Entity_Id;
8527 Formal_Pack : Entity_Id;
8528 Gen_Parent : Entity_Id;
8531 Parent_Spec : Node_Id;
8533 procedure Find_Matching_Actual
8535 Act : in out Entity_Id);
8536 -- We need to associate each formal entity in the formal package
8537 -- with the corresponding entity in the actual package. The actual
8538 -- package has been analyzed and possibly expanded, and as a result
8539 -- there is no one-to-one correspondence between the two lists (for
8540 -- example, the actual may include subtypes, itypes, and inherited
8541 -- primitive operations, interspersed among the renaming declarations
8542 -- for the actuals) . We retrieve the corresponding actual by name
8543 -- because each actual has the same name as the formal, and they do
8544 -- appear in the same order.
8546 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
8547 -- Retrieve entity of defining entity of generic formal parameter.
8548 -- Only the declarations of formals need to be considered when
8549 -- linking them to actuals, but the declarative list may include
8550 -- internal entities generated during analysis, and those are ignored.
8552 procedure Match_Formal_Entity
8553 (Formal_Node : Node_Id;
8554 Formal_Ent : Entity_Id;
8555 Actual_Ent : Entity_Id);
8556 -- Associates the formal entity with the actual. In the case
8557 -- where Formal_Ent is a formal package, this procedure iterates
8558 -- through all of its formals and enters associations between the
8559 -- actuals occurring in the formal package's corresponding actual
8560 -- package (given by Actual_Ent) and the formal package's formal
8561 -- parameters. This procedure recurses if any of the parameters is
8562 -- itself a package.
8564 function Is_Instance_Of
8565 (Act_Spec : Entity_Id;
8566 Gen_Anc : Entity_Id) return Boolean;
8567 -- The actual can be an instantiation of a generic within another
8568 -- instance, in which case there is no direct link from it to the
8569 -- original generic ancestor. In that case, we recognize that the
8570 -- ultimate ancestor is the same by examining names and scopes.
8572 procedure Process_Nested_Formal (Formal : Entity_Id);
8573 -- If the current formal is declared with a box, its own formals are
8574 -- visible in the instance, as they were in the generic, and their
8575 -- Hidden flag must be reset. If some of these formals are themselves
8576 -- packages declared with a box, the processing must be recursive.
8578 --------------------------
8579 -- Find_Matching_Actual --
8580 --------------------------
8582 procedure Find_Matching_Actual
8584 Act : in out Entity_Id)
8586 Formal_Ent : Entity_Id;
8589 case Nkind (Original_Node (F)) is
8590 when N_Formal_Object_Declaration |
8591 N_Formal_Type_Declaration =>
8592 Formal_Ent := Defining_Identifier (F);
8594 while Chars (Act) /= Chars (Formal_Ent) loop
8598 when N_Formal_Subprogram_Declaration |
8599 N_Formal_Package_Declaration |
8600 N_Package_Declaration |
8601 N_Generic_Package_Declaration =>
8602 Formal_Ent := Defining_Entity (F);
8604 while Chars (Act) /= Chars (Formal_Ent) loop
8609 raise Program_Error;
8611 end Find_Matching_Actual;
8613 -------------------------
8614 -- Match_Formal_Entity --
8615 -------------------------
8617 procedure Match_Formal_Entity
8618 (Formal_Node : Node_Id;
8619 Formal_Ent : Entity_Id;
8620 Actual_Ent : Entity_Id)
8622 Act_Pkg : Entity_Id;
8625 Set_Instance_Of (Formal_Ent, Actual_Ent);
8627 if Ekind (Actual_Ent) = E_Package then
8629 -- Record associations for each parameter
8631 Act_Pkg := Actual_Ent;
8634 A_Ent : Entity_Id := First_Entity (Act_Pkg);
8643 -- Retrieve the actual given in the formal package declaration
8645 Actual := Entity (Name (Original_Node (Formal_Node)));
8647 -- The actual in the formal package declaration may be a
8648 -- renamed generic package, in which case we want to retrieve
8649 -- the original generic in order to traverse its formal part.
8651 if Present (Renamed_Entity (Actual)) then
8652 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8654 Gen_Decl := Unit_Declaration_Node (Actual);
8657 Formals := Generic_Formal_Declarations (Gen_Decl);
8659 if Present (Formals) then
8660 F_Node := First_Non_Pragma (Formals);
8665 while Present (A_Ent)
8666 and then Present (F_Node)
8667 and then A_Ent /= First_Private_Entity (Act_Pkg)
8669 F_Ent := Get_Formal_Entity (F_Node);
8671 if Present (F_Ent) then
8673 -- This is a formal of the original package. Record
8674 -- association and recurse.
8676 Find_Matching_Actual (F_Node, A_Ent);
8677 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8678 Next_Entity (A_Ent);
8681 Next_Non_Pragma (F_Node);
8685 end Match_Formal_Entity;
8687 -----------------------
8688 -- Get_Formal_Entity --
8689 -----------------------
8691 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8692 Kind : constant Node_Kind := Nkind (Original_Node (N));
8695 when N_Formal_Object_Declaration =>
8696 return Defining_Identifier (N);
8698 when N_Formal_Type_Declaration =>
8699 return Defining_Identifier (N);
8701 when N_Formal_Subprogram_Declaration =>
8702 return Defining_Unit_Name (Specification (N));
8704 when N_Formal_Package_Declaration =>
8705 return Defining_Identifier (Original_Node (N));
8707 when N_Generic_Package_Declaration =>
8708 return Defining_Identifier (Original_Node (N));
8710 -- All other declarations are introduced by semantic analysis and
8711 -- have no match in the actual.
8716 end Get_Formal_Entity;
8718 --------------------
8719 -- Is_Instance_Of --
8720 --------------------
8722 function Is_Instance_Of
8723 (Act_Spec : Entity_Id;
8724 Gen_Anc : Entity_Id) return Boolean
8726 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8729 if No (Gen_Par) then
8732 -- Simplest case: the generic parent of the actual is the formal
8734 elsif Gen_Par = Gen_Anc then
8737 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
8740 -- The actual may be obtained through several instantiations. Its
8741 -- scope must itself be an instance of a generic declared in the
8742 -- same scope as the formal. Any other case is detected above.
8744 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
8748 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
8752 ---------------------------
8753 -- Process_Nested_Formal --
8754 ---------------------------
8756 procedure Process_Nested_Formal (Formal : Entity_Id) is
8760 if Present (Associated_Formal_Package (Formal))
8761 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8763 Ent := First_Entity (Formal);
8764 while Present (Ent) loop
8765 Set_Is_Hidden (Ent, False);
8766 Set_Is_Visible_Formal (Ent);
8767 Set_Is_Potentially_Use_Visible
8768 (Ent, Is_Potentially_Use_Visible (Formal));
8770 if Ekind (Ent) = E_Package then
8771 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
8772 Process_Nested_Formal (Ent);
8778 end Process_Nested_Formal;
8780 -- Start of processing for Instantiate_Formal_Package
8785 if not Is_Entity_Name (Actual)
8786 or else Ekind (Entity (Actual)) /= E_Package
8789 ("expect package instance to instantiate formal", Actual);
8790 Abandon_Instantiation (Actual);
8791 raise Program_Error;
8794 Actual_Pack := Entity (Actual);
8795 Set_Is_Instantiated (Actual_Pack);
8797 -- The actual may be a renamed package, or an outer generic formal
8798 -- package whose instantiation is converted into a renaming.
8800 if Present (Renamed_Object (Actual_Pack)) then
8801 Actual_Pack := Renamed_Object (Actual_Pack);
8804 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
8805 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
8806 Formal_Pack := Defining_Identifier (Analyzed_Formal);
8809 Generic_Parent (Specification (Analyzed_Formal));
8811 Defining_Unit_Name (Specification (Analyzed_Formal));
8814 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
8815 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
8817 Parent_Spec := Parent (Actual_Pack);
8820 if Gen_Parent = Any_Id then
8822 ("previous error in declaration of formal package", Actual);
8823 Abandon_Instantiation (Actual);
8826 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
8832 ("actual parameter must be instance of&", Actual, Gen_Parent);
8833 Abandon_Instantiation (Actual);
8836 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
8837 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
8840 Make_Package_Renaming_Declaration (Loc,
8841 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
8842 Name => New_Reference_To (Actual_Pack, Loc));
8844 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
8845 Defining_Identifier (Formal));
8846 Decls := New_List (Nod);
8848 -- If the formal F has a box, then the generic declarations are
8849 -- visible in the generic G. In an instance of G, the corresponding
8850 -- entities in the actual for F (which are the actuals for the
8851 -- instantiation of the generic that F denotes) must also be made
8852 -- visible for analysis of the current instance. On exit from the
8853 -- current instance, those entities are made private again. If the
8854 -- actual is currently in use, these entities are also use-visible.
8856 -- The loop through the actual entities also steps through the formal
8857 -- entities and enters associations from formals to actuals into the
8858 -- renaming map. This is necessary to properly handle checking of
8859 -- actual parameter associations for later formals that depend on
8860 -- actuals declared in the formal package.
8862 -- In Ada 2005, partial parametrization requires that we make visible
8863 -- the actuals corresponding to formals that were defaulted in the
8864 -- formal package. There formals are identified because they remain
8865 -- formal generics within the formal package, rather than being
8866 -- renamings of the actuals supplied.
8869 Gen_Decl : constant Node_Id :=
8870 Unit_Declaration_Node (Gen_Parent);
8871 Formals : constant List_Id :=
8872 Generic_Formal_Declarations (Gen_Decl);
8874 Actual_Ent : Entity_Id;
8875 Actual_Of_Formal : Node_Id;
8876 Formal_Node : Node_Id;
8877 Formal_Ent : Entity_Id;
8880 if Present (Formals) then
8881 Formal_Node := First_Non_Pragma (Formals);
8883 Formal_Node := Empty;
8886 Actual_Ent := First_Entity (Actual_Pack);
8888 First (Visible_Declarations (Specification (Analyzed_Formal)));
8889 while Present (Actual_Ent)
8890 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8892 if Present (Formal_Node) then
8893 Formal_Ent := Get_Formal_Entity (Formal_Node);
8895 if Present (Formal_Ent) then
8896 Find_Matching_Actual (Formal_Node, Actual_Ent);
8898 (Formal_Node, Formal_Ent, Actual_Ent);
8900 -- We iterate at the same time over the actuals of the
8901 -- local package created for the formal, to determine
8902 -- which one of the formals of the original generic were
8903 -- defaulted in the formal. The corresponding actual
8904 -- entities are visible in the enclosing instance.
8906 if Box_Present (Formal)
8908 (Present (Actual_Of_Formal)
8911 (Get_Formal_Entity (Actual_Of_Formal)))
8913 Set_Is_Hidden (Actual_Ent, False);
8914 Set_Is_Visible_Formal (Actual_Ent);
8915 Set_Is_Potentially_Use_Visible
8916 (Actual_Ent, In_Use (Actual_Pack));
8918 if Ekind (Actual_Ent) = E_Package then
8919 Process_Nested_Formal (Actual_Ent);
8923 Set_Is_Hidden (Actual_Ent);
8924 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
8928 Next_Non_Pragma (Formal_Node);
8929 Next (Actual_Of_Formal);
8932 -- No further formals to match, but the generic part may
8933 -- contain inherited operation that are not hidden in the
8934 -- enclosing instance.
8936 Next_Entity (Actual_Ent);
8940 -- Inherited subprograms generated by formal derived types are
8941 -- also visible if the types are.
8943 Actual_Ent := First_Entity (Actual_Pack);
8944 while Present (Actual_Ent)
8945 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8947 if Is_Overloadable (Actual_Ent)
8949 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
8951 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
8953 Set_Is_Hidden (Actual_Ent, False);
8954 Set_Is_Potentially_Use_Visible
8955 (Actual_Ent, In_Use (Actual_Pack));
8958 Next_Entity (Actual_Ent);
8962 -- If the formal is not declared with a box, reanalyze it as an
8963 -- abbreviated instantiation, to verify the matching rules of 12.7.
8964 -- The actual checks are performed after the generic associations
8965 -- have been analyzed, to guarantee the same visibility for this
8966 -- instantiation and for the actuals.
8968 -- In Ada 2005, the generic associations for the formal can include
8969 -- defaulted parameters. These are ignored during check. This
8970 -- internal instantiation is removed from the tree after conformance
8971 -- checking, because it contains formal declarations for those
8972 -- defaulted parameters, and those should not reach the back-end.
8974 if not Box_Present (Formal) then
8976 I_Pack : constant Entity_Id :=
8977 Make_Temporary (Sloc (Actual), 'P');
8980 Set_Is_Internal (I_Pack);
8983 Make_Package_Instantiation (Sloc (Actual),
8984 Defining_Unit_Name => I_Pack,
8987 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
8988 Generic_Associations =>
8989 Generic_Associations (Formal)));
8995 end Instantiate_Formal_Package;
8997 -----------------------------------
8998 -- Instantiate_Formal_Subprogram --
8999 -----------------------------------
9001 function Instantiate_Formal_Subprogram
9004 Analyzed_Formal : Node_Id) return Node_Id
9007 Formal_Sub : constant Entity_Id :=
9008 Defining_Unit_Name (Specification (Formal));
9009 Analyzed_S : constant Entity_Id :=
9010 Defining_Unit_Name (Specification (Analyzed_Formal));
9011 Decl_Node : Node_Id;
9015 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
9016 -- If the generic is a child unit, the parent has been installed on the
9017 -- scope stack, but a default subprogram cannot resolve to something on
9018 -- the parent because that parent is not really part of the visible
9019 -- context (it is there to resolve explicit local entities). If the
9020 -- default has resolved in this way, we remove the entity from
9021 -- immediate visibility and analyze the node again to emit an error
9022 -- message or find another visible candidate.
9024 procedure Valid_Actual_Subprogram (Act : Node_Id);
9025 -- Perform legality check and raise exception on failure
9027 -----------------------
9028 -- From_Parent_Scope --
9029 -----------------------
9031 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
9032 Gen_Scope : Node_Id;
9035 Gen_Scope := Scope (Analyzed_S);
9036 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop
9037 if Scope (Subp) = Scope (Gen_Scope) then
9041 Gen_Scope := Scope (Gen_Scope);
9045 end From_Parent_Scope;
9047 -----------------------------
9048 -- Valid_Actual_Subprogram --
9049 -----------------------------
9051 procedure Valid_Actual_Subprogram (Act : Node_Id) is
9055 if Is_Entity_Name (Act) then
9056 Act_E := Entity (Act);
9058 elsif Nkind (Act) = N_Selected_Component
9059 and then Is_Entity_Name (Selector_Name (Act))
9061 Act_E := Entity (Selector_Name (Act));
9067 if (Present (Act_E) and then Is_Overloadable (Act_E))
9068 or else Nkind_In (Act, N_Attribute_Reference,
9069 N_Indexed_Component,
9070 N_Character_Literal,
9071 N_Explicit_Dereference)
9077 ("expect subprogram or entry name in instantiation of&",
9078 Instantiation_Node, Formal_Sub);
9079 Abandon_Instantiation (Instantiation_Node);
9081 end Valid_Actual_Subprogram;
9083 -- Start of processing for Instantiate_Formal_Subprogram
9086 New_Spec := New_Copy_Tree (Specification (Formal));
9088 -- The tree copy has created the proper instantiation sloc for the
9089 -- new specification. Use this location for all other constructed
9092 Loc := Sloc (Defining_Unit_Name (New_Spec));
9094 -- Create new entity for the actual (New_Copy_Tree does not)
9096 Set_Defining_Unit_Name
9097 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9099 -- Create new entities for the each of the formals in the
9100 -- specification of the renaming declaration built for the actual.
9102 if Present (Parameter_Specifications (New_Spec)) then
9106 F := First (Parameter_Specifications (New_Spec));
9107 while Present (F) loop
9108 Set_Defining_Identifier (F,
9109 Make_Defining_Identifier (Sloc (F),
9110 Chars => Chars (Defining_Identifier (F))));
9116 -- Find entity of actual. If the actual is an attribute reference, it
9117 -- cannot be resolved here (its formal is missing) but is handled
9118 -- instead in Attribute_Renaming. If the actual is overloaded, it is
9119 -- fully resolved subsequently, when the renaming declaration for the
9120 -- formal is analyzed. If it is an explicit dereference, resolve the
9121 -- prefix but not the actual itself, to prevent interpretation as call.
9123 if Present (Actual) then
9124 Loc := Sloc (Actual);
9125 Set_Sloc (New_Spec, Loc);
9127 if Nkind (Actual) = N_Operator_Symbol then
9128 Find_Direct_Name (Actual);
9130 elsif Nkind (Actual) = N_Explicit_Dereference then
9131 Analyze (Prefix (Actual));
9133 elsif Nkind (Actual) /= N_Attribute_Reference then
9137 Valid_Actual_Subprogram (Actual);
9140 elsif Present (Default_Name (Formal)) then
9141 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
9142 N_Selected_Component,
9143 N_Indexed_Component,
9144 N_Character_Literal)
9145 and then Present (Entity (Default_Name (Formal)))
9147 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
9149 Nam := New_Copy (Default_Name (Formal));
9150 Set_Sloc (Nam, Loc);
9153 elsif Box_Present (Formal) then
9155 -- Actual is resolved at the point of instantiation. Create an
9156 -- identifier or operator with the same name as the formal.
9158 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
9159 Nam := Make_Operator_Symbol (Loc,
9160 Chars => Chars (Formal_Sub),
9161 Strval => No_String);
9163 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
9166 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
9167 and then Null_Present (Specification (Formal))
9169 -- Generate null body for procedure, for use in the instance
9172 Make_Subprogram_Body (Loc,
9173 Specification => New_Spec,
9174 Declarations => New_List,
9175 Handled_Statement_Sequence =>
9176 Make_Handled_Sequence_Of_Statements (Loc,
9177 Statements => New_List (Make_Null_Statement (Loc))));
9179 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
9183 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
9185 ("missing actual&", Instantiation_Node, Formal_Sub);
9187 ("\in instantiation of & declared#",
9188 Instantiation_Node, Scope (Analyzed_S));
9189 Abandon_Instantiation (Instantiation_Node);
9193 Make_Subprogram_Renaming_Declaration (Loc,
9194 Specification => New_Spec,
9197 -- If we do not have an actual and the formal specified <> then set to
9198 -- get proper default.
9200 if No (Actual) and then Box_Present (Formal) then
9201 Set_From_Default (Decl_Node);
9204 -- Gather possible interpretations for the actual before analyzing the
9205 -- instance. If overloaded, it will be resolved when analyzing the
9206 -- renaming declaration.
9208 if Box_Present (Formal)
9209 and then No (Actual)
9213 if Is_Child_Unit (Scope (Analyzed_S))
9214 and then Present (Entity (Nam))
9216 if not Is_Overloaded (Nam) then
9217 if From_Parent_Scope (Entity (Nam)) then
9218 Set_Is_Immediately_Visible (Entity (Nam), False);
9219 Set_Entity (Nam, Empty);
9220 Set_Etype (Nam, Empty);
9223 Set_Is_Immediately_Visible (Entity (Nam));
9232 Get_First_Interp (Nam, I, It);
9233 while Present (It.Nam) loop
9234 if From_Parent_Scope (It.Nam) then
9238 Get_Next_Interp (I, It);
9245 -- The generic instantiation freezes the actual. This can only be done
9246 -- once the actual is resolved, in the analysis of the renaming
9247 -- declaration. To make the formal subprogram entity available, we set
9248 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
9249 -- This is also needed in Analyze_Subprogram_Renaming for the processing
9250 -- of formal abstract subprograms.
9252 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
9254 -- We cannot analyze the renaming declaration, and thus find the actual,
9255 -- until all the actuals are assembled in the instance. For subsequent
9256 -- checks of other actuals, indicate the node that will hold the
9257 -- instance of this formal.
9259 Set_Instance_Of (Analyzed_S, Nam);
9261 if Nkind (Actual) = N_Selected_Component
9262 and then Is_Task_Type (Etype (Prefix (Actual)))
9263 and then not Is_Frozen (Etype (Prefix (Actual)))
9265 -- The renaming declaration will create a body, which must appear
9266 -- outside of the instantiation, We move the renaming declaration
9267 -- out of the instance, and create an additional renaming inside,
9268 -- to prevent freezing anomalies.
9271 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
9274 Set_Defining_Unit_Name (New_Spec, Anon_Id);
9275 Insert_Before (Instantiation_Node, Decl_Node);
9276 Analyze (Decl_Node);
9278 -- Now create renaming within the instance
9281 Make_Subprogram_Renaming_Declaration (Loc,
9282 Specification => New_Copy_Tree (New_Spec),
9283 Name => New_Occurrence_Of (Anon_Id, Loc));
9285 Set_Defining_Unit_Name (Specification (Decl_Node),
9286 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
9291 end Instantiate_Formal_Subprogram;
9293 ------------------------
9294 -- Instantiate_Object --
9295 ------------------------
9297 function Instantiate_Object
9300 Analyzed_Formal : Node_Id) return List_Id
9302 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
9303 A_Gen_Obj : constant Entity_Id :=
9304 Defining_Identifier (Analyzed_Formal);
9305 Acc_Def : Node_Id := Empty;
9306 Act_Assoc : constant Node_Id := Parent (Actual);
9307 Actual_Decl : Node_Id := Empty;
9308 Decl_Node : Node_Id;
9311 List : constant List_Id := New_List;
9312 Loc : constant Source_Ptr := Sloc (Actual);
9313 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
9314 Subt_Decl : Node_Id := Empty;
9315 Subt_Mark : Node_Id := Empty;
9318 if Present (Subtype_Mark (Formal)) then
9319 Subt_Mark := Subtype_Mark (Formal);
9321 Check_Access_Definition (Formal);
9322 Acc_Def := Access_Definition (Formal);
9325 -- Sloc for error message on missing actual
9327 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
9329 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
9330 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
9333 Set_Parent (List, Parent (Actual));
9337 if Out_Present (Formal) then
9339 -- An IN OUT generic actual must be a name. The instantiation is a
9340 -- renaming declaration. The actual is the name being renamed. We
9341 -- use the actual directly, rather than a copy, because it is not
9342 -- used further in the list of actuals, and because a copy or a use
9343 -- of relocate_node is incorrect if the instance is nested within a
9344 -- generic. In order to simplify ASIS searches, the Generic_Parent
9345 -- field links the declaration to the generic association.
9350 Instantiation_Node, Gen_Obj);
9352 ("\in instantiation of & declared#",
9353 Instantiation_Node, Scope (A_Gen_Obj));
9354 Abandon_Instantiation (Instantiation_Node);
9357 if Present (Subt_Mark) then
9359 Make_Object_Renaming_Declaration (Loc,
9360 Defining_Identifier => New_Copy (Gen_Obj),
9361 Subtype_Mark => New_Copy_Tree (Subt_Mark),
9364 else pragma Assert (Present (Acc_Def));
9366 Make_Object_Renaming_Declaration (Loc,
9367 Defining_Identifier => New_Copy (Gen_Obj),
9368 Access_Definition => New_Copy_Tree (Acc_Def),
9372 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9374 -- The analysis of the actual may produce insert_action nodes, so
9375 -- the declaration must have a context in which to attach them.
9377 Append (Decl_Node, List);
9380 -- Return if the analysis of the actual reported some error
9382 if Etype (Actual) = Any_Type then
9386 -- This check is performed here because Analyze_Object_Renaming will
9387 -- not check it when Comes_From_Source is False. Note though that the
9388 -- check for the actual being the name of an object will be performed
9389 -- in Analyze_Object_Renaming.
9391 if Is_Object_Reference (Actual)
9392 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
9395 ("illegal discriminant-dependent component for in out parameter",
9399 -- The actual has to be resolved in order to check that it is a
9400 -- variable (due to cases such as F (1), where F returns access to an
9401 -- array, and for overloaded prefixes).
9403 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
9405 -- If the type of the formal is not itself a formal, and the
9406 -- current unit is a child unit, the formal type must be declared
9407 -- in a parent, and must be retrieved by visibility.
9410 and then Is_Generic_Unit (Scope (Ftyp))
9411 and then Is_Child_Unit (Scope (A_Gen_Obj))
9414 Temp : constant Node_Id :=
9415 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
9417 Set_Entity (Temp, Empty);
9419 Ftyp := Entity (Temp);
9423 if Is_Private_Type (Ftyp)
9424 and then not Is_Private_Type (Etype (Actual))
9425 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
9426 or else Base_Type (Etype (Actual)) = Ftyp)
9428 -- If the actual has the type of the full view of the formal, or
9429 -- else a non-private subtype of the formal, then the visibility
9430 -- of the formal type has changed. Add to the actuals a subtype
9431 -- declaration that will force the exchange of views in the body
9432 -- of the instance as well.
9435 Make_Subtype_Declaration (Loc,
9436 Defining_Identifier => Make_Temporary (Loc, 'P'),
9437 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
9439 Prepend (Subt_Decl, List);
9441 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
9442 Exchange_Declarations (Ftyp);
9445 Resolve (Actual, Ftyp);
9447 if not Denotes_Variable (Actual) then
9449 ("actual for& must be a variable", Actual, Gen_Obj);
9451 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
9453 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
9454 -- the type of the actual shall resolve to a specific anonymous
9457 if Ada_Version < Ada_2005
9459 Ekind (Base_Type (Ftyp)) /=
9460 E_Anonymous_Access_Type
9462 Ekind (Base_Type (Etype (Actual))) /=
9463 E_Anonymous_Access_Type
9465 Error_Msg_NE ("type of actual does not match type of&",
9470 Note_Possible_Modification (Actual, Sure => True);
9472 -- Check for instantiation of atomic/volatile actual for
9473 -- non-atomic/volatile formal (RM C.6 (12)).
9475 if Is_Atomic_Object (Actual)
9476 and then not Is_Atomic (Orig_Ftyp)
9479 ("cannot instantiate non-atomic formal object " &
9480 "with atomic actual", Actual);
9482 elsif Is_Volatile_Object (Actual)
9483 and then not Is_Volatile (Orig_Ftyp)
9486 ("cannot instantiate non-volatile formal object " &
9487 "with volatile actual", Actual);
9490 -- Formal in-parameter
9493 -- The instantiation of a generic formal in-parameter is constant
9494 -- declaration. The actual is the expression for that declaration.
9496 if Present (Actual) then
9497 if Present (Subt_Mark) then
9499 else pragma Assert (Present (Acc_Def));
9504 Make_Object_Declaration (Loc,
9505 Defining_Identifier => New_Copy (Gen_Obj),
9506 Constant_Present => True,
9507 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9508 Object_Definition => New_Copy_Tree (Def),
9509 Expression => Actual);
9511 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
9513 -- A generic formal object of a tagged type is defined to be
9514 -- aliased so the new constant must also be treated as aliased.
9516 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
9517 Set_Aliased_Present (Decl_Node);
9520 Append (Decl_Node, List);
9522 -- No need to repeat (pre-)analysis of some expression nodes
9523 -- already handled in Preanalyze_Actuals.
9525 if Nkind (Actual) /= N_Allocator then
9528 -- Return if the analysis of the actual reported some error
9530 if Etype (Actual) = Any_Type then
9536 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
9540 Typ := Get_Instance_Of (Formal_Type);
9542 Freeze_Before (Instantiation_Node, Typ);
9544 -- If the actual is an aggregate, perform name resolution on
9545 -- its components (the analysis of an aggregate does not do it)
9546 -- to capture local names that may be hidden if the generic is
9549 if Nkind (Actual) = N_Aggregate then
9550 Preanalyze_And_Resolve (Actual, Typ);
9553 if Is_Limited_Type (Typ)
9554 and then not OK_For_Limited_Init (Typ, Actual)
9557 ("initialization not allowed for limited types", Actual);
9558 Explain_Limited_Type (Typ, Actual);
9562 elsif Present (Default_Expression (Formal)) then
9564 -- Use default to construct declaration
9566 if Present (Subt_Mark) then
9568 else pragma Assert (Present (Acc_Def));
9573 Make_Object_Declaration (Sloc (Formal),
9574 Defining_Identifier => New_Copy (Gen_Obj),
9575 Constant_Present => True,
9576 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9577 Object_Definition => New_Copy (Def),
9578 Expression => New_Copy_Tree
9579 (Default_Expression (Formal)));
9581 Append (Decl_Node, List);
9582 Set_Analyzed (Expression (Decl_Node), False);
9587 Instantiation_Node, Gen_Obj);
9588 Error_Msg_NE ("\in instantiation of & declared#",
9589 Instantiation_Node, Scope (A_Gen_Obj));
9591 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
9593 -- Create dummy constant declaration so that instance can be
9594 -- analyzed, to minimize cascaded visibility errors.
9596 if Present (Subt_Mark) then
9598 else pragma Assert (Present (Acc_Def));
9603 Make_Object_Declaration (Loc,
9604 Defining_Identifier => New_Copy (Gen_Obj),
9605 Constant_Present => True,
9606 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
9607 Object_Definition => New_Copy (Def),
9609 Make_Attribute_Reference (Sloc (Gen_Obj),
9610 Attribute_Name => Name_First,
9611 Prefix => New_Copy (Def)));
9613 Append (Decl_Node, List);
9616 Abandon_Instantiation (Instantiation_Node);
9621 if Nkind (Actual) in N_Has_Entity then
9622 Actual_Decl := Parent (Entity (Actual));
9625 -- Ada 2005 (AI-423): For a formal object declaration with a null
9626 -- exclusion or an access definition that has a null exclusion: If the
9627 -- actual matching the formal object declaration denotes a generic
9628 -- formal object of another generic unit G, and the instantiation
9629 -- containing the actual occurs within the body of G or within the body
9630 -- of a generic unit declared within the declarative region of G, then
9631 -- the declaration of the formal object of G must have a null exclusion.
9632 -- Otherwise, the subtype of the actual matching the formal object
9633 -- declaration shall exclude null.
9635 if Ada_Version >= Ada_2005
9636 and then Present (Actual_Decl)
9638 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9639 N_Object_Declaration)
9640 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9641 and then not Has_Null_Exclusion (Actual_Decl)
9642 and then Has_Null_Exclusion (Analyzed_Formal)
9644 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9646 ("actual must exclude null to match generic formal#", Actual);
9650 end Instantiate_Object;
9652 ------------------------------
9653 -- Instantiate_Package_Body --
9654 ------------------------------
9656 procedure Instantiate_Package_Body
9657 (Body_Info : Pending_Body_Info;
9658 Inlined_Body : Boolean := False;
9659 Body_Optional : Boolean := False)
9661 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9662 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9663 Loc : constant Source_Ptr := Sloc (Inst_Node);
9665 Gen_Id : constant Node_Id := Name (Inst_Node);
9666 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9667 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9668 Act_Spec : constant Node_Id := Specification (Act_Decl);
9669 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9671 Act_Body_Name : Node_Id;
9673 Gen_Body_Id : Node_Id;
9675 Act_Body_Id : Entity_Id;
9677 Parent_Installed : Boolean := False;
9678 Save_Style_Check : constant Boolean := Style_Check;
9680 Par_Ent : Entity_Id := Empty;
9681 Par_Vis : Boolean := False;
9683 Vis_Prims_List : Elist_Id := No_Elist;
9684 -- List of primitives made temporarily visible in the instantiation
9685 -- to match the visibility of the formal type
9688 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9690 -- The instance body may already have been processed, as the parent of
9691 -- another instance that is inlined (Load_Parent_Of_Generic).
9693 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
9697 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9699 -- Re-establish the state of information on which checks are suppressed.
9700 -- This information was set in Body_Info at the point of instantiation,
9701 -- and now we restore it so that the instance is compiled using the
9702 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9704 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9705 Scope_Suppress := Body_Info.Scope_Suppress;
9706 Opt.Ada_Version := Body_Info.Version;
9708 if No (Gen_Body_Id) then
9709 Load_Parent_Of_Generic
9710 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9711 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9714 -- Establish global variable for sloc adjustment and for error recovery
9716 Instantiation_Node := Inst_Node;
9718 if Present (Gen_Body_Id) then
9719 Save_Env (Gen_Unit, Act_Decl_Id);
9720 Style_Check := False;
9721 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9723 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9725 Create_Instantiation_Source
9726 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
9730 (Original_Node (Gen_Body), Empty, Instantiating => True);
9732 -- Build new name (possibly qualified) for body declaration
9734 Act_Body_Id := New_Copy (Act_Decl_Id);
9736 -- Some attributes of spec entity are not inherited by body entity
9738 Set_Handler_Records (Act_Body_Id, No_List);
9740 if Nkind (Defining_Unit_Name (Act_Spec)) =
9741 N_Defining_Program_Unit_Name
9744 Make_Defining_Program_Unit_Name (Loc,
9745 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
9746 Defining_Identifier => Act_Body_Id);
9748 Act_Body_Name := Act_Body_Id;
9751 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
9753 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
9754 Check_Generic_Actuals (Act_Decl_Id, False);
9756 -- Install primitives hidden at the point of the instantiation but
9757 -- visible when processing the generic formals
9763 E := First_Entity (Act_Decl_Id);
9764 while Present (E) loop
9766 and then Is_Generic_Actual_Type (E)
9767 and then Is_Tagged_Type (E)
9769 Install_Hidden_Primitives
9770 (Prims_List => Vis_Prims_List,
9771 Gen_T => Generic_Parent_Type (Parent (E)),
9779 -- If it is a child unit, make the parent instance (which is an
9780 -- instance of the parent of the generic) visible. The parent
9781 -- instance is the prefix of the name of the generic unit.
9783 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9784 and then Nkind (Gen_Id) = N_Expanded_Name
9786 Par_Ent := Entity (Prefix (Gen_Id));
9787 Par_Vis := Is_Immediately_Visible (Par_Ent);
9788 Install_Parent (Par_Ent, In_Body => True);
9789 Parent_Installed := True;
9791 elsif Is_Child_Unit (Gen_Unit) then
9792 Par_Ent := Scope (Gen_Unit);
9793 Par_Vis := Is_Immediately_Visible (Par_Ent);
9794 Install_Parent (Par_Ent, In_Body => True);
9795 Parent_Installed := True;
9798 -- If the instantiation is a library unit, and this is the main unit,
9799 -- then build the resulting compilation unit nodes for the instance.
9800 -- If this is a compilation unit but it is not the main unit, then it
9801 -- is the body of a unit in the context, that is being compiled
9802 -- because it is encloses some inlined unit or another generic unit
9803 -- being instantiated. In that case, this body is not part of the
9804 -- current compilation, and is not attached to the tree, but its
9805 -- parent must be set for analysis.
9807 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9809 -- Replace instance node with body of instance, and create new
9810 -- node for corresponding instance declaration.
9812 Build_Instance_Compilation_Unit_Nodes
9813 (Inst_Node, Act_Body, Act_Decl);
9814 Analyze (Inst_Node);
9816 if Parent (Inst_Node) = Cunit (Main_Unit) then
9818 -- If the instance is a child unit itself, then set the scope
9819 -- of the expanded body to be the parent of the instantiation
9820 -- (ensuring that the fully qualified name will be generated
9821 -- for the elaboration subprogram).
9823 if Nkind (Defining_Unit_Name (Act_Spec)) =
9824 N_Defining_Program_Unit_Name
9827 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
9831 -- Case where instantiation is not a library unit
9834 -- If this is an early instantiation, i.e. appears textually
9835 -- before the corresponding body and must be elaborated first,
9836 -- indicate that the body instance is to be delayed.
9838 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
9840 -- Now analyze the body. We turn off all checks if this is an
9841 -- internal unit, since there is no reason to have checks on for
9842 -- any predefined run-time library code. All such code is designed
9843 -- to be compiled with checks off.
9845 -- Note that we do NOT apply this criterion to children of GNAT
9846 -- (or on VMS, children of DEC). The latter units must suppress
9847 -- checks explicitly if this is needed.
9849 if Is_Predefined_File_Name
9850 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
9852 Analyze (Act_Body, Suppress => All_Checks);
9858 Inherit_Context (Gen_Body, Inst_Node);
9860 -- Remove the parent instances if they have been placed on the scope
9861 -- stack to compile the body.
9863 if Parent_Installed then
9864 Remove_Parent (In_Body => True);
9866 -- Restore the previous visibility of the parent
9868 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9871 Restore_Hidden_Primitives (Vis_Prims_List);
9872 Restore_Private_Views (Act_Decl_Id);
9874 -- Remove the current unit from visibility if this is an instance
9875 -- that is not elaborated on the fly for inlining purposes.
9877 if not Inlined_Body then
9878 Set_Is_Immediately_Visible (Act_Decl_Id, False);
9882 Style_Check := Save_Style_Check;
9884 -- If we have no body, and the unit requires a body, then complain. This
9885 -- complaint is suppressed if we have detected other errors (since a
9886 -- common reason for missing the body is that it had errors).
9887 -- In CodePeer mode, a warning has been emitted already, no need for
9888 -- further messages.
9890 elsif Unit_Requires_Body (Gen_Unit)
9891 and then not Body_Optional
9893 if CodePeer_Mode then
9896 elsif Serious_Errors_Detected = 0 then
9898 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
9900 -- Don't attempt to perform any cleanup actions if some other error
9901 -- was already detected, since this can cause blowups.
9907 -- Case of package that does not need a body
9910 -- If the instantiation of the declaration is a library unit, rewrite
9911 -- the original package instantiation as a package declaration in the
9912 -- compilation unit node.
9914 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9915 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
9916 Rewrite (Inst_Node, Act_Decl);
9918 -- Generate elaboration entity, in case spec has elaboration code.
9919 -- This cannot be done when the instance is analyzed, because it
9920 -- is not known yet whether the body exists.
9922 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
9923 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
9925 -- If the instantiation is not a library unit, then append the
9926 -- declaration to the list of implicitly generated entities, unless
9927 -- it is already a list member which means that it was already
9930 elsif not Is_List_Member (Act_Decl) then
9931 Mark_Rewrite_Insertion (Act_Decl);
9932 Insert_Before (Inst_Node, Act_Decl);
9936 Expander_Mode_Restore;
9937 end Instantiate_Package_Body;
9939 ---------------------------------
9940 -- Instantiate_Subprogram_Body --
9941 ---------------------------------
9943 procedure Instantiate_Subprogram_Body
9944 (Body_Info : Pending_Body_Info;
9945 Body_Optional : Boolean := False)
9947 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9948 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9949 Loc : constant Source_Ptr := Sloc (Inst_Node);
9950 Gen_Id : constant Node_Id := Name (Inst_Node);
9951 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9952 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9953 Anon_Id : constant Entity_Id :=
9954 Defining_Unit_Name (Specification (Act_Decl));
9955 Pack_Id : constant Entity_Id :=
9956 Defining_Unit_Name (Parent (Act_Decl));
9959 Gen_Body_Id : Node_Id;
9961 Pack_Body : Node_Id;
9962 Prev_Formal : Entity_Id;
9964 Unit_Renaming : Node_Id;
9966 Parent_Installed : Boolean := False;
9967 Save_Style_Check : constant Boolean := Style_Check;
9969 Par_Ent : Entity_Id := Empty;
9970 Par_Vis : Boolean := False;
9973 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9975 -- Subprogram body may have been created already because of an inline
9976 -- pragma, or because of multiple elaborations of the enclosing package
9977 -- when several instances of the subprogram appear in the main unit.
9979 if Present (Corresponding_Body (Act_Decl)) then
9983 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9985 -- Re-establish the state of information on which checks are suppressed.
9986 -- This information was set in Body_Info at the point of instantiation,
9987 -- and now we restore it so that the instance is compiled using the
9988 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9990 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9991 Scope_Suppress := Body_Info.Scope_Suppress;
9992 Opt.Ada_Version := Body_Info.Version;
9994 if No (Gen_Body_Id) then
9996 -- For imported generic subprogram, no body to compile, complete
9997 -- the spec entity appropriately.
9999 if Is_Imported (Gen_Unit) then
10000 Set_Is_Imported (Anon_Id);
10001 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
10002 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
10003 Set_Convention (Anon_Id, Convention (Gen_Unit));
10004 Set_Has_Completion (Anon_Id);
10007 -- For other cases, compile the body
10010 Load_Parent_Of_Generic
10011 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10012 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10016 Instantiation_Node := Inst_Node;
10018 if Present (Gen_Body_Id) then
10019 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10021 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
10023 -- Either body is not present, or context is non-expanding, as
10024 -- when compiling a subunit. Mark the instance as completed, and
10025 -- diagnose a missing body when needed.
10028 and then Operating_Mode = Generate_Code
10031 ("missing proper body for instantiation", Gen_Body);
10034 Set_Has_Completion (Anon_Id);
10038 Save_Env (Gen_Unit, Anon_Id);
10039 Style_Check := False;
10040 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10041 Create_Instantiation_Source
10049 (Original_Node (Gen_Body), Empty, Instantiating => True);
10051 -- Create proper defining name for the body, to correspond to
10052 -- the one in the spec.
10054 Set_Defining_Unit_Name (Specification (Act_Body),
10055 Make_Defining_Identifier
10056 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
10057 Set_Corresponding_Spec (Act_Body, Anon_Id);
10058 Set_Has_Completion (Anon_Id);
10059 Check_Generic_Actuals (Pack_Id, False);
10061 -- Generate a reference to link the visible subprogram instance to
10062 -- the generic body, which for navigation purposes is the only
10063 -- available source for the instance.
10066 (Related_Instance (Pack_Id),
10067 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
10069 -- If it is a child unit, make the parent instance (which is an
10070 -- instance of the parent of the generic) visible. The parent
10071 -- instance is the prefix of the name of the generic unit.
10073 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10074 and then Nkind (Gen_Id) = N_Expanded_Name
10076 Par_Ent := Entity (Prefix (Gen_Id));
10077 Par_Vis := Is_Immediately_Visible (Par_Ent);
10078 Install_Parent (Par_Ent, In_Body => True);
10079 Parent_Installed := True;
10081 elsif Is_Child_Unit (Gen_Unit) then
10082 Par_Ent := Scope (Gen_Unit);
10083 Par_Vis := Is_Immediately_Visible (Par_Ent);
10084 Install_Parent (Par_Ent, In_Body => True);
10085 Parent_Installed := True;
10088 -- Inside its body, a reference to the generic unit is a reference
10089 -- to the instance. The corresponding renaming is the first
10090 -- declaration in the body.
10093 Make_Subprogram_Renaming_Declaration (Loc,
10095 Copy_Generic_Node (
10096 Specification (Original_Node (Gen_Body)),
10098 Instantiating => True),
10099 Name => New_Occurrence_Of (Anon_Id, Loc));
10101 -- If there is a formal subprogram with the same name as the unit
10102 -- itself, do not add this renaming declaration. This is a temporary
10103 -- fix for one ACVC test. ???
10105 Prev_Formal := First_Entity (Pack_Id);
10106 while Present (Prev_Formal) loop
10107 if Chars (Prev_Formal) = Chars (Gen_Unit)
10108 and then Is_Overloadable (Prev_Formal)
10113 Next_Entity (Prev_Formal);
10116 if Present (Prev_Formal) then
10117 Decls := New_List (Act_Body);
10119 Decls := New_List (Unit_Renaming, Act_Body);
10122 -- The subprogram body is placed in the body of a dummy package body,
10123 -- whose spec contains the subprogram declaration as well as the
10124 -- renaming declarations for the generic parameters.
10126 Pack_Body := Make_Package_Body (Loc,
10127 Defining_Unit_Name => New_Copy (Pack_Id),
10128 Declarations => Decls);
10130 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10132 -- If the instantiation is a library unit, then build resulting
10133 -- compilation unit nodes for the instance. The declaration of
10134 -- the enclosing package is the grandparent of the subprogram
10135 -- declaration. First replace the instantiation node as the unit
10136 -- of the corresponding compilation.
10138 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10139 if Parent (Inst_Node) = Cunit (Main_Unit) then
10140 Set_Unit (Parent (Inst_Node), Inst_Node);
10141 Build_Instance_Compilation_Unit_Nodes
10142 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
10143 Analyze (Inst_Node);
10145 Set_Parent (Pack_Body, Parent (Inst_Node));
10146 Analyze (Pack_Body);
10150 Insert_Before (Inst_Node, Pack_Body);
10151 Mark_Rewrite_Insertion (Pack_Body);
10152 Analyze (Pack_Body);
10154 if Expander_Active then
10155 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
10159 Inherit_Context (Gen_Body, Inst_Node);
10161 Restore_Private_Views (Pack_Id, False);
10163 if Parent_Installed then
10164 Remove_Parent (In_Body => True);
10166 -- Restore the previous visibility of the parent
10168 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
10172 Style_Check := Save_Style_Check;
10174 -- Body not found. Error was emitted already. If there were no previous
10175 -- errors, this may be an instance whose scope is a premature instance.
10176 -- In that case we must insure that the (legal) program does raise
10177 -- program error if executed. We generate a subprogram body for this
10178 -- purpose. See DEC ac30vso.
10180 -- Should not reference proprietary DEC tests in comments ???
10182 elsif Serious_Errors_Detected = 0
10183 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
10185 if Body_Optional then
10188 elsif Ekind (Anon_Id) = E_Procedure then
10190 Make_Subprogram_Body (Loc,
10192 Make_Procedure_Specification (Loc,
10193 Defining_Unit_Name =>
10194 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10195 Parameter_Specifications =>
10197 (Parameter_Specifications (Parent (Anon_Id)))),
10199 Declarations => Empty_List,
10200 Handled_Statement_Sequence =>
10201 Make_Handled_Sequence_Of_Statements (Loc,
10204 Make_Raise_Program_Error (Loc,
10206 PE_Access_Before_Elaboration))));
10210 Make_Raise_Program_Error (Loc,
10211 Reason => PE_Access_Before_Elaboration);
10213 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
10214 Set_Analyzed (Ret_Expr);
10217 Make_Subprogram_Body (Loc,
10219 Make_Function_Specification (Loc,
10220 Defining_Unit_Name =>
10221 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
10222 Parameter_Specifications =>
10224 (Parameter_Specifications (Parent (Anon_Id))),
10225 Result_Definition =>
10226 New_Occurrence_Of (Etype (Anon_Id), Loc)),
10228 Declarations => Empty_List,
10229 Handled_Statement_Sequence =>
10230 Make_Handled_Sequence_Of_Statements (Loc,
10233 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
10236 Pack_Body := Make_Package_Body (Loc,
10237 Defining_Unit_Name => New_Copy (Pack_Id),
10238 Declarations => New_List (Act_Body));
10240 Insert_After (Inst_Node, Pack_Body);
10241 Set_Corresponding_Spec (Pack_Body, Pack_Id);
10242 Analyze (Pack_Body);
10245 Expander_Mode_Restore;
10246 end Instantiate_Subprogram_Body;
10248 ----------------------
10249 -- Instantiate_Type --
10250 ----------------------
10252 function Instantiate_Type
10255 Analyzed_Formal : Node_Id;
10256 Actual_Decls : List_Id) return List_Id
10258 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
10259 A_Gen_T : constant Entity_Id :=
10260 Defining_Identifier (Analyzed_Formal);
10261 Ancestor : Entity_Id := Empty;
10262 Def : constant Node_Id := Formal_Type_Definition (Formal);
10264 Decl_Node : Node_Id;
10265 Decl_Nodes : List_Id;
10269 procedure Validate_Array_Type_Instance;
10270 procedure Validate_Access_Subprogram_Instance;
10271 procedure Validate_Access_Type_Instance;
10272 procedure Validate_Derived_Type_Instance;
10273 procedure Validate_Derived_Interface_Type_Instance;
10274 procedure Validate_Discriminated_Formal_Type;
10275 procedure Validate_Interface_Type_Instance;
10276 procedure Validate_Private_Type_Instance;
10277 procedure Validate_Incomplete_Type_Instance;
10278 -- These procedures perform validation tests for the named case.
10279 -- Validate_Discriminated_Formal_Type is shared by formal private
10280 -- types and Ada 2012 formal incomplete types.
10282 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
10283 -- Check that base types are the same and that the subtypes match
10284 -- statically. Used in several of the above.
10286 --------------------
10287 -- Subtypes_Match --
10288 --------------------
10290 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
10291 T : constant Entity_Id := Get_Instance_Of (Gen_T);
10294 return (Base_Type (T) = Base_Type (Act_T)
10295 and then Subtypes_Statically_Match (T, Act_T))
10297 or else (Is_Class_Wide_Type (Gen_T)
10298 and then Is_Class_Wide_Type (Act_T)
10301 (Get_Instance_Of (Root_Type (Gen_T)),
10302 Root_Type (Act_T)))
10305 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
10306 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
10307 and then Ekind (Act_T) = Ekind (Gen_T)
10309 Subtypes_Statically_Match
10310 (Designated_Type (Gen_T), Designated_Type (Act_T)));
10311 end Subtypes_Match;
10313 -----------------------------------------
10314 -- Validate_Access_Subprogram_Instance --
10315 -----------------------------------------
10317 procedure Validate_Access_Subprogram_Instance is
10319 if not Is_Access_Type (Act_T)
10320 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
10323 ("expect access type in instantiation of &", Actual, Gen_T);
10324 Abandon_Instantiation (Actual);
10327 Check_Mode_Conformant
10328 (Designated_Type (Act_T),
10329 Designated_Type (A_Gen_T),
10333 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
10334 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
10336 ("protected access type not allowed for formal &",
10340 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
10342 ("expect protected access type for formal &",
10345 end Validate_Access_Subprogram_Instance;
10347 -----------------------------------
10348 -- Validate_Access_Type_Instance --
10349 -----------------------------------
10351 procedure Validate_Access_Type_Instance is
10352 Desig_Type : constant Entity_Id :=
10353 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
10354 Desig_Act : Entity_Id;
10357 if not Is_Access_Type (Act_T) then
10359 ("expect access type in instantiation of &", Actual, Gen_T);
10360 Abandon_Instantiation (Actual);
10363 if Is_Access_Constant (A_Gen_T) then
10364 if not Is_Access_Constant (Act_T) then
10366 ("actual type must be access-to-constant type", Actual);
10367 Abandon_Instantiation (Actual);
10370 if Is_Access_Constant (Act_T) then
10372 ("actual type must be access-to-variable type", Actual);
10373 Abandon_Instantiation (Actual);
10375 elsif Ekind (A_Gen_T) = E_General_Access_Type
10376 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
10378 Error_Msg_N -- CODEFIX
10379 ("actual must be general access type!", Actual);
10380 Error_Msg_NE -- CODEFIX
10381 ("add ALL to }!", Actual, Act_T);
10382 Abandon_Instantiation (Actual);
10386 -- The designated subtypes, that is to say the subtypes introduced
10387 -- by an access type declaration (and not by a subtype declaration)
10390 Desig_Act := Designated_Type (Base_Type (Act_T));
10392 -- The designated type may have been introduced through a limited_
10393 -- with clause, in which case retrieve the non-limited view. This
10394 -- applies to incomplete types as well as to class-wide types.
10396 if From_With_Type (Desig_Act) then
10397 Desig_Act := Available_View (Desig_Act);
10400 if not Subtypes_Match
10401 (Desig_Type, Desig_Act) then
10403 ("designated type of actual does not match that of formal &",
10405 Abandon_Instantiation (Actual);
10407 elsif Is_Access_Type (Designated_Type (Act_T))
10408 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
10410 Is_Constrained (Designated_Type (Desig_Type))
10413 ("designated type of actual does not match that of formal &",
10415 Abandon_Instantiation (Actual);
10418 -- Ada 2005: null-exclusion indicators of the two types must agree
10420 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
10422 ("non null exclusion of actual and formal & do not match",
10425 end Validate_Access_Type_Instance;
10427 ----------------------------------
10428 -- Validate_Array_Type_Instance --
10429 ----------------------------------
10431 procedure Validate_Array_Type_Instance is
10436 function Formal_Dimensions return Int;
10437 -- Count number of dimensions in array type formal
10439 -----------------------
10440 -- Formal_Dimensions --
10441 -----------------------
10443 function Formal_Dimensions return Int is
10448 if Nkind (Def) = N_Constrained_Array_Definition then
10449 Index := First (Discrete_Subtype_Definitions (Def));
10451 Index := First (Subtype_Marks (Def));
10454 while Present (Index) loop
10456 Next_Index (Index);
10460 end Formal_Dimensions;
10462 -- Start of processing for Validate_Array_Type_Instance
10465 if not Is_Array_Type (Act_T) then
10467 ("expect array type in instantiation of &", Actual, Gen_T);
10468 Abandon_Instantiation (Actual);
10470 elsif Nkind (Def) = N_Constrained_Array_Definition then
10471 if not (Is_Constrained (Act_T)) then
10473 ("expect constrained array in instantiation of &",
10475 Abandon_Instantiation (Actual);
10479 if Is_Constrained (Act_T) then
10481 ("expect unconstrained array in instantiation of &",
10483 Abandon_Instantiation (Actual);
10487 if Formal_Dimensions /= Number_Dimensions (Act_T) then
10489 ("dimensions of actual do not match formal &", Actual, Gen_T);
10490 Abandon_Instantiation (Actual);
10493 I1 := First_Index (A_Gen_T);
10494 I2 := First_Index (Act_T);
10495 for J in 1 .. Formal_Dimensions loop
10497 -- If the indexes of the actual were given by a subtype_mark,
10498 -- the index was transformed into a range attribute. Retrieve
10499 -- the original type mark for checking.
10501 if Is_Entity_Name (Original_Node (I2)) then
10502 T2 := Entity (Original_Node (I2));
10507 if not Subtypes_Match
10508 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
10511 ("index types of actual do not match those of formal &",
10513 Abandon_Instantiation (Actual);
10520 -- Check matching subtypes. Note that there are complex visibility
10521 -- issues when the generic is a child unit and some aspect of the
10522 -- generic type is declared in a parent unit of the generic. We do
10523 -- the test to handle this special case only after a direct check
10524 -- for static matching has failed.
10527 (Component_Type (A_Gen_T), Component_Type (Act_T))
10528 or else Subtypes_Match
10529 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
10530 Component_Type (Act_T))
10535 ("component subtype of actual does not match that of formal &",
10537 Abandon_Instantiation (Actual);
10540 if Has_Aliased_Components (A_Gen_T)
10541 and then not Has_Aliased_Components (Act_T)
10544 ("actual must have aliased components to match formal type &",
10547 end Validate_Array_Type_Instance;
10549 -----------------------------------------------
10550 -- Validate_Derived_Interface_Type_Instance --
10551 -----------------------------------------------
10553 procedure Validate_Derived_Interface_Type_Instance is
10554 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
10558 -- First apply interface instance checks
10560 Validate_Interface_Type_Instance;
10562 -- Verify that immediate parent interface is an ancestor of
10566 and then not Interface_Present_In_Ancestor (Act_T, Par)
10569 ("interface actual must include progenitor&", Actual, Par);
10572 -- Now verify that the actual includes all other ancestors of
10575 Elmt := First_Elmt (Interfaces (A_Gen_T));
10576 while Present (Elmt) loop
10577 if not Interface_Present_In_Ancestor
10578 (Act_T, Get_Instance_Of (Node (Elmt)))
10581 ("interface actual must include progenitor&",
10582 Actual, Node (Elmt));
10587 end Validate_Derived_Interface_Type_Instance;
10589 ------------------------------------
10590 -- Validate_Derived_Type_Instance --
10591 ------------------------------------
10593 procedure Validate_Derived_Type_Instance is
10594 Actual_Discr : Entity_Id;
10595 Ancestor_Discr : Entity_Id;
10598 -- If the parent type in the generic declaration is itself a previous
10599 -- formal type, then it is local to the generic and absent from the
10600 -- analyzed generic definition. In that case the ancestor is the
10601 -- instance of the formal (which must have been instantiated
10602 -- previously), unless the ancestor is itself a formal derived type.
10603 -- In this latter case (which is the subject of Corrigendum 8652/0038
10604 -- (AI-202) the ancestor of the formals is the ancestor of its
10605 -- parent. Otherwise, the analyzed generic carries the parent type.
10606 -- If the parent type is defined in a previous formal package, then
10607 -- the scope of that formal package is that of the generic type
10608 -- itself, and it has already been mapped into the corresponding type
10609 -- in the actual package.
10611 -- Common case: parent type defined outside of the generic
10613 if Is_Entity_Name (Subtype_Mark (Def))
10614 and then Present (Entity (Subtype_Mark (Def)))
10616 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
10618 -- Check whether parent is defined in a previous formal package
10621 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
10624 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
10626 -- The type may be a local derivation, or a type extension of a
10627 -- previous formal, or of a formal of a parent package.
10629 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
10631 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
10633 -- Check whether the parent is another derived formal type in the
10634 -- same generic unit.
10636 if Etype (A_Gen_T) /= A_Gen_T
10637 and then Is_Generic_Type (Etype (A_Gen_T))
10638 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
10639 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
10641 -- Locate ancestor of parent from the subtype declaration
10642 -- created for the actual.
10648 Decl := First (Actual_Decls);
10649 while Present (Decl) loop
10650 if Nkind (Decl) = N_Subtype_Declaration
10651 and then Chars (Defining_Identifier (Decl)) =
10652 Chars (Etype (A_Gen_T))
10654 Ancestor := Generic_Parent_Type (Decl);
10662 pragma Assert (Present (Ancestor));
10666 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
10670 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
10673 -- If the formal derived type has pragma Preelaborable_Initialization
10674 -- then the actual type must have preelaborable initialization.
10676 if Known_To_Have_Preelab_Init (A_Gen_T)
10677 and then not Has_Preelaborable_Initialization (Act_T)
10680 ("actual for & must have preelaborable initialization",
10684 -- Ada 2005 (AI-251)
10686 if Ada_Version >= Ada_2005
10687 and then Is_Interface (Ancestor)
10689 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
10691 ("(Ada 2005) expected type implementing & in instantiation",
10695 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
10697 ("expect type derived from & in instantiation",
10698 Actual, First_Subtype (Ancestor));
10699 Abandon_Instantiation (Actual);
10702 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10703 -- that the formal type declaration has been rewritten as a private
10706 if Ada_Version >= Ada_2005
10707 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
10708 and then Synchronized_Present (Parent (A_Gen_T))
10710 -- The actual must be a synchronized tagged type
10712 if not Is_Tagged_Type (Act_T) then
10714 ("actual of synchronized type must be tagged", Actual);
10715 Abandon_Instantiation (Actual);
10717 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
10718 and then Nkind (Type_Definition (Parent (Act_T))) =
10719 N_Derived_Type_Definition
10720 and then not Synchronized_Present (Type_Definition
10724 ("actual of synchronized type must be synchronized", Actual);
10725 Abandon_Instantiation (Actual);
10729 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
10730 -- removes the second instance of the phrase "or allow pass by copy".
10732 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
10734 ("cannot have atomic actual type for non-atomic formal type",
10737 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
10739 ("cannot have volatile actual type for non-volatile formal type",
10743 -- It should not be necessary to check for unknown discriminants on
10744 -- Formal, but for some reason Has_Unknown_Discriminants is false for
10745 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
10746 -- needs fixing. ???
10748 if not Is_Indefinite_Subtype (A_Gen_T)
10749 and then not Unknown_Discriminants_Present (Formal)
10750 and then Is_Indefinite_Subtype (Act_T)
10753 ("actual subtype must be constrained", Actual);
10754 Abandon_Instantiation (Actual);
10757 if not Unknown_Discriminants_Present (Formal) then
10758 if Is_Constrained (Ancestor) then
10759 if not Is_Constrained (Act_T) then
10761 ("actual subtype must be constrained", Actual);
10762 Abandon_Instantiation (Actual);
10765 -- Ancestor is unconstrained, Check if generic formal and actual
10766 -- agree on constrainedness. The check only applies to array types
10767 -- and discriminated types.
10769 elsif Is_Constrained (Act_T) then
10770 if Ekind (Ancestor) = E_Access_Type
10772 (not Is_Constrained (A_Gen_T)
10773 and then Is_Composite_Type (A_Gen_T))
10776 ("actual subtype must be unconstrained", Actual);
10777 Abandon_Instantiation (Actual);
10780 -- A class-wide type is only allowed if the formal has unknown
10783 elsif Is_Class_Wide_Type (Act_T)
10784 and then not Has_Unknown_Discriminants (Ancestor)
10787 ("actual for & cannot be a class-wide type", Actual, Gen_T);
10788 Abandon_Instantiation (Actual);
10790 -- Otherwise, the formal and actual shall have the same number
10791 -- of discriminants and each discriminant of the actual must
10792 -- correspond to a discriminant of the formal.
10794 elsif Has_Discriminants (Act_T)
10795 and then not Has_Unknown_Discriminants (Act_T)
10796 and then Has_Discriminants (Ancestor)
10798 Actual_Discr := First_Discriminant (Act_T);
10799 Ancestor_Discr := First_Discriminant (Ancestor);
10800 while Present (Actual_Discr)
10801 and then Present (Ancestor_Discr)
10803 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
10804 No (Corresponding_Discriminant (Actual_Discr))
10807 ("discriminant & does not correspond " &
10808 "to ancestor discriminant", Actual, Actual_Discr);
10809 Abandon_Instantiation (Actual);
10812 Next_Discriminant (Actual_Discr);
10813 Next_Discriminant (Ancestor_Discr);
10816 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
10818 ("actual for & must have same number of discriminants",
10820 Abandon_Instantiation (Actual);
10823 -- This case should be caught by the earlier check for
10824 -- constrainedness, but the check here is added for completeness.
10826 elsif Has_Discriminants (Act_T)
10827 and then not Has_Unknown_Discriminants (Act_T)
10830 ("actual for & must not have discriminants", Actual, Gen_T);
10831 Abandon_Instantiation (Actual);
10833 elsif Has_Discriminants (Ancestor) then
10835 ("actual for & must have known discriminants", Actual, Gen_T);
10836 Abandon_Instantiation (Actual);
10839 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
10841 ("constraint on actual is incompatible with formal", Actual);
10842 Abandon_Instantiation (Actual);
10846 -- If the formal and actual types are abstract, check that there
10847 -- are no abstract primitives of the actual type that correspond to
10848 -- nonabstract primitives of the formal type (second sentence of
10851 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
10852 Check_Abstract_Primitives : declare
10853 Gen_Prims : constant Elist_Id :=
10854 Primitive_Operations (A_Gen_T);
10855 Gen_Elmt : Elmt_Id;
10856 Gen_Subp : Entity_Id;
10857 Anc_Subp : Entity_Id;
10858 Anc_Formal : Entity_Id;
10859 Anc_F_Type : Entity_Id;
10861 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
10862 Act_Elmt : Elmt_Id;
10863 Act_Subp : Entity_Id;
10864 Act_Formal : Entity_Id;
10865 Act_F_Type : Entity_Id;
10867 Subprograms_Correspond : Boolean;
10869 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
10870 -- Returns true if T2 is derived directly or indirectly from
10871 -- T1, including derivations from interfaces. T1 and T2 are
10872 -- required to be specific tagged base types.
10874 ------------------------
10875 -- Is_Tagged_Ancestor --
10876 ------------------------
10878 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
10880 Intfc_Elmt : Elmt_Id;
10883 -- The predicate is satisfied if the types are the same
10888 -- If we've reached the top of the derivation chain then
10889 -- we know that T1 is not an ancestor of T2.
10891 elsif Etype (T2) = T2 then
10894 -- Proceed to check T2's immediate parent
10896 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
10899 -- Finally, check to see if T1 is an ancestor of any of T2's
10903 Intfc_Elmt := First_Elmt (Interfaces (T2));
10904 while Present (Intfc_Elmt) loop
10905 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
10909 Next_Elmt (Intfc_Elmt);
10914 end Is_Tagged_Ancestor;
10916 -- Start of processing for Check_Abstract_Primitives
10919 -- Loop over all of the formal derived type's primitives
10921 Gen_Elmt := First_Elmt (Gen_Prims);
10922 while Present (Gen_Elmt) loop
10923 Gen_Subp := Node (Gen_Elmt);
10925 -- If the primitive of the formal is not abstract, then
10926 -- determine whether there is a corresponding primitive of
10927 -- the actual type that's abstract.
10929 if not Is_Abstract_Subprogram (Gen_Subp) then
10930 Act_Elmt := First_Elmt (Act_Prims);
10931 while Present (Act_Elmt) loop
10932 Act_Subp := Node (Act_Elmt);
10934 -- If we find an abstract primitive of the actual,
10935 -- then we need to test whether it corresponds to the
10936 -- subprogram from which the generic formal primitive
10939 if Is_Abstract_Subprogram (Act_Subp) then
10940 Anc_Subp := Alias (Gen_Subp);
10942 -- Test whether we have a corresponding primitive
10943 -- by comparing names, kinds, formal types, and
10946 if Chars (Anc_Subp) = Chars (Act_Subp)
10947 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
10949 Anc_Formal := First_Formal (Anc_Subp);
10950 Act_Formal := First_Formal (Act_Subp);
10951 while Present (Anc_Formal)
10952 and then Present (Act_Formal)
10954 Anc_F_Type := Etype (Anc_Formal);
10955 Act_F_Type := Etype (Act_Formal);
10957 if Ekind (Anc_F_Type)
10958 = E_Anonymous_Access_Type
10960 Anc_F_Type := Designated_Type (Anc_F_Type);
10962 if Ekind (Act_F_Type)
10963 = E_Anonymous_Access_Type
10966 Designated_Type (Act_F_Type);
10972 Ekind (Act_F_Type) = E_Anonymous_Access_Type
10977 Anc_F_Type := Base_Type (Anc_F_Type);
10978 Act_F_Type := Base_Type (Act_F_Type);
10980 -- If the formal is controlling, then the
10981 -- the type of the actual primitive's formal
10982 -- must be derived directly or indirectly
10983 -- from the type of the ancestor primitive's
10986 if Is_Controlling_Formal (Anc_Formal) then
10987 if not Is_Tagged_Ancestor
10988 (Anc_F_Type, Act_F_Type)
10993 -- Otherwise the types of the formals must
10996 elsif Anc_F_Type /= Act_F_Type then
11000 Next_Entity (Anc_Formal);
11001 Next_Entity (Act_Formal);
11004 -- If we traversed through all of the formals
11005 -- then so far the subprograms correspond, so
11006 -- now check that any result types correspond.
11008 if No (Anc_Formal) and then No (Act_Formal) then
11009 Subprograms_Correspond := True;
11011 if Ekind (Act_Subp) = E_Function then
11012 Anc_F_Type := Etype (Anc_Subp);
11013 Act_F_Type := Etype (Act_Subp);
11015 if Ekind (Anc_F_Type)
11016 = E_Anonymous_Access_Type
11019 Designated_Type (Anc_F_Type);
11021 if Ekind (Act_F_Type)
11022 = E_Anonymous_Access_Type
11025 Designated_Type (Act_F_Type);
11027 Subprograms_Correspond := False;
11032 = E_Anonymous_Access_Type
11034 Subprograms_Correspond := False;
11037 Anc_F_Type := Base_Type (Anc_F_Type);
11038 Act_F_Type := Base_Type (Act_F_Type);
11040 -- Now either the result types must be
11041 -- the same or, if the result type is
11042 -- controlling, the result type of the
11043 -- actual primitive must descend from the
11044 -- result type of the ancestor primitive.
11046 if Subprograms_Correspond
11047 and then Anc_F_Type /= Act_F_Type
11049 Has_Controlling_Result (Anc_Subp)
11051 not Is_Tagged_Ancestor
11052 (Anc_F_Type, Act_F_Type)
11054 Subprograms_Correspond := False;
11058 -- Found a matching subprogram belonging to
11059 -- formal ancestor type, so actual subprogram
11060 -- corresponds and this violates 3.9.3(9).
11062 if Subprograms_Correspond then
11064 ("abstract subprogram & overrides " &
11065 "nonabstract subprogram of ancestor",
11073 Next_Elmt (Act_Elmt);
11077 Next_Elmt (Gen_Elmt);
11079 end Check_Abstract_Primitives;
11082 -- Verify that limitedness matches. If parent is a limited
11083 -- interface then the generic formal is not unless declared
11084 -- explicitly so. If not declared limited, the actual cannot be
11085 -- limited (see AI05-0087).
11087 -- Even though this AI is a binding interpretation, we enable the
11088 -- check only in Ada 2012 mode, because this improper construct
11089 -- shows up in user code and in existing B-tests.
11091 if Is_Limited_Type (Act_T)
11092 and then not Is_Limited_Type (A_Gen_T)
11093 and then Ada_Version >= Ada_2012
11095 if In_Instance then
11099 ("actual for non-limited & cannot be a limited type", Actual,
11101 Explain_Limited_Type (Act_T, Actual);
11102 Abandon_Instantiation (Actual);
11105 end Validate_Derived_Type_Instance;
11107 ----------------------------------------
11108 -- Validate_Discriminated_Formal_Type --
11109 ----------------------------------------
11111 procedure Validate_Discriminated_Formal_Type is
11112 Formal_Discr : Entity_Id;
11113 Actual_Discr : Entity_Id;
11114 Formal_Subt : Entity_Id;
11117 if Has_Discriminants (A_Gen_T) then
11118 if not Has_Discriminants (Act_T) then
11120 ("actual for & must have discriminants", Actual, Gen_T);
11121 Abandon_Instantiation (Actual);
11123 elsif Is_Constrained (Act_T) then
11125 ("actual for & must be unconstrained", Actual, Gen_T);
11126 Abandon_Instantiation (Actual);
11129 Formal_Discr := First_Discriminant (A_Gen_T);
11130 Actual_Discr := First_Discriminant (Act_T);
11131 while Formal_Discr /= Empty loop
11132 if Actual_Discr = Empty then
11134 ("discriminants on actual do not match formal",
11136 Abandon_Instantiation (Actual);
11139 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
11141 -- Access discriminants match if designated types do
11143 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
11144 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
11145 E_Anonymous_Access_Type
11148 (Designated_Type (Base_Type (Formal_Subt))) =
11149 Designated_Type (Base_Type (Etype (Actual_Discr)))
11153 elsif Base_Type (Formal_Subt) /=
11154 Base_Type (Etype (Actual_Discr))
11157 ("types of actual discriminants must match formal",
11159 Abandon_Instantiation (Actual);
11161 elsif not Subtypes_Statically_Match
11162 (Formal_Subt, Etype (Actual_Discr))
11163 and then Ada_Version >= Ada_95
11166 ("subtypes of actual discriminants must match formal",
11168 Abandon_Instantiation (Actual);
11171 Next_Discriminant (Formal_Discr);
11172 Next_Discriminant (Actual_Discr);
11175 if Actual_Discr /= Empty then
11177 ("discriminants on actual do not match formal",
11179 Abandon_Instantiation (Actual);
11183 end Validate_Discriminated_Formal_Type;
11185 ---------------------------------------
11186 -- Validate_Incomplete_Type_Instance --
11187 ---------------------------------------
11189 procedure Validate_Incomplete_Type_Instance is
11191 if not Is_Tagged_Type (Act_T)
11192 and then Is_Tagged_Type (A_Gen_T)
11195 ("actual for & must be a tagged type", Actual, Gen_T);
11198 Validate_Discriminated_Formal_Type;
11199 end Validate_Incomplete_Type_Instance;
11201 --------------------------------------
11202 -- Validate_Interface_Type_Instance --
11203 --------------------------------------
11205 procedure Validate_Interface_Type_Instance is
11207 if not Is_Interface (Act_T) then
11209 ("actual for formal interface type must be an interface",
11212 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
11214 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
11216 Is_Protected_Interface (A_Gen_T) /=
11217 Is_Protected_Interface (Act_T)
11219 Is_Synchronized_Interface (A_Gen_T) /=
11220 Is_Synchronized_Interface (Act_T)
11223 ("actual for interface& does not match (RM 12.5.5(4))",
11226 end Validate_Interface_Type_Instance;
11228 ------------------------------------
11229 -- Validate_Private_Type_Instance --
11230 ------------------------------------
11232 procedure Validate_Private_Type_Instance is
11234 if Is_Limited_Type (Act_T)
11235 and then not Is_Limited_Type (A_Gen_T)
11237 if In_Instance then
11241 ("actual for non-limited & cannot be a limited type", Actual,
11243 Explain_Limited_Type (Act_T, Actual);
11244 Abandon_Instantiation (Actual);
11247 elsif Known_To_Have_Preelab_Init (A_Gen_T)
11248 and then not Has_Preelaborable_Initialization (Act_T)
11251 ("actual for & must have preelaborable initialization", Actual,
11254 elsif Is_Indefinite_Subtype (Act_T)
11255 and then not Is_Indefinite_Subtype (A_Gen_T)
11256 and then Ada_Version >= Ada_95
11259 ("actual for & must be a definite subtype", Actual, Gen_T);
11261 elsif not Is_Tagged_Type (Act_T)
11262 and then Is_Tagged_Type (A_Gen_T)
11265 ("actual for & must be a tagged type", Actual, Gen_T);
11268 Validate_Discriminated_Formal_Type;
11270 end Validate_Private_Type_Instance;
11272 -- Start of processing for Instantiate_Type
11275 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
11276 Error_Msg_N ("duplicate instantiation of generic type", Actual);
11277 return New_List (Error);
11279 elsif not Is_Entity_Name (Actual)
11280 or else not Is_Type (Entity (Actual))
11283 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
11284 Abandon_Instantiation (Actual);
11287 Act_T := Entity (Actual);
11289 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
11290 -- as a generic actual parameter if the corresponding formal type
11291 -- does not have a known_discriminant_part, or is a formal derived
11292 -- type that is an Unchecked_Union type.
11294 if Is_Unchecked_Union (Base_Type (Act_T)) then
11295 if not Has_Discriminants (A_Gen_T)
11297 (Is_Derived_Type (A_Gen_T)
11299 Is_Unchecked_Union (A_Gen_T))
11303 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
11304 " discriminated formal type", Act_T);
11309 -- Deal with fixed/floating restrictions
11311 if Is_Floating_Point_Type (Act_T) then
11312 Check_Restriction (No_Floating_Point, Actual);
11313 elsif Is_Fixed_Point_Type (Act_T) then
11314 Check_Restriction (No_Fixed_Point, Actual);
11317 -- Deal with error of using incomplete type as generic actual.
11318 -- This includes limited views of a type, even if the non-limited
11319 -- view may be available.
11321 if Ekind (Act_T) = E_Incomplete_Type
11322 or else (Is_Class_Wide_Type (Act_T)
11324 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
11326 -- If the formal is an incomplete type, the actual can be
11327 -- incomplete as well.
11329 if Ekind (A_Gen_T) = E_Incomplete_Type then
11332 elsif Is_Class_Wide_Type (Act_T)
11333 or else No (Full_View (Act_T))
11335 Error_Msg_N ("premature use of incomplete type", Actual);
11336 Abandon_Instantiation (Actual);
11338 Act_T := Full_View (Act_T);
11339 Set_Entity (Actual, Act_T);
11341 if Has_Private_Component (Act_T) then
11343 ("premature use of type with private component", Actual);
11347 -- Deal with error of premature use of private type as generic actual
11349 elsif Is_Private_Type (Act_T)
11350 and then Is_Private_Type (Base_Type (Act_T))
11351 and then not Is_Generic_Type (Act_T)
11352 and then not Is_Derived_Type (Act_T)
11353 and then No (Full_View (Root_Type (Act_T)))
11355 -- If the formal is an incomplete type, the actual can be
11356 -- private or incomplete as well.
11358 if Ekind (A_Gen_T) = E_Incomplete_Type then
11361 Error_Msg_N ("premature use of private type", Actual);
11364 elsif Has_Private_Component (Act_T) then
11366 ("premature use of type with private component", Actual);
11369 Set_Instance_Of (A_Gen_T, Act_T);
11371 -- If the type is generic, the class-wide type may also be used
11373 if Is_Tagged_Type (A_Gen_T)
11374 and then Is_Tagged_Type (Act_T)
11375 and then not Is_Class_Wide_Type (A_Gen_T)
11377 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
11378 Class_Wide_Type (Act_T));
11381 if not Is_Abstract_Type (A_Gen_T)
11382 and then Is_Abstract_Type (Act_T)
11385 ("actual of non-abstract formal cannot be abstract", Actual);
11388 -- A generic scalar type is a first subtype for which we generate
11389 -- an anonymous base type. Indicate that the instance of this base
11390 -- is the base type of the actual.
11392 if Is_Scalar_Type (A_Gen_T) then
11393 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
11397 if Error_Posted (Act_T) then
11400 case Nkind (Def) is
11401 when N_Formal_Private_Type_Definition =>
11402 Validate_Private_Type_Instance;
11404 when N_Formal_Incomplete_Type_Definition =>
11405 Validate_Incomplete_Type_Instance;
11407 when N_Formal_Derived_Type_Definition =>
11408 Validate_Derived_Type_Instance;
11410 when N_Formal_Discrete_Type_Definition =>
11411 if not Is_Discrete_Type (Act_T) then
11413 ("expect discrete type in instantiation of&",
11415 Abandon_Instantiation (Actual);
11418 when N_Formal_Signed_Integer_Type_Definition =>
11419 if not Is_Signed_Integer_Type (Act_T) then
11421 ("expect signed integer type in instantiation of&",
11423 Abandon_Instantiation (Actual);
11426 when N_Formal_Modular_Type_Definition =>
11427 if not Is_Modular_Integer_Type (Act_T) then
11429 ("expect modular type in instantiation of &",
11431 Abandon_Instantiation (Actual);
11434 when N_Formal_Floating_Point_Definition =>
11435 if not Is_Floating_Point_Type (Act_T) then
11437 ("expect float type in instantiation of &", Actual, Gen_T);
11438 Abandon_Instantiation (Actual);
11441 when N_Formal_Ordinary_Fixed_Point_Definition =>
11442 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
11444 ("expect ordinary fixed point type in instantiation of &",
11446 Abandon_Instantiation (Actual);
11449 when N_Formal_Decimal_Fixed_Point_Definition =>
11450 if not Is_Decimal_Fixed_Point_Type (Act_T) then
11452 ("expect decimal type in instantiation of &",
11454 Abandon_Instantiation (Actual);
11457 when N_Array_Type_Definition =>
11458 Validate_Array_Type_Instance;
11460 when N_Access_To_Object_Definition =>
11461 Validate_Access_Type_Instance;
11463 when N_Access_Function_Definition |
11464 N_Access_Procedure_Definition =>
11465 Validate_Access_Subprogram_Instance;
11467 when N_Record_Definition =>
11468 Validate_Interface_Type_Instance;
11470 when N_Derived_Type_Definition =>
11471 Validate_Derived_Interface_Type_Instance;
11474 raise Program_Error;
11479 Subt := New_Copy (Gen_T);
11481 -- Use adjusted sloc of subtype name as the location for other nodes in
11482 -- the subtype declaration.
11484 Loc := Sloc (Subt);
11487 Make_Subtype_Declaration (Loc,
11488 Defining_Identifier => Subt,
11489 Subtype_Indication => New_Reference_To (Act_T, Loc));
11491 if Is_Private_Type (Act_T) then
11492 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11494 elsif Is_Access_Type (Act_T)
11495 and then Is_Private_Type (Designated_Type (Act_T))
11497 Set_Has_Private_View (Subtype_Indication (Decl_Node));
11500 Decl_Nodes := New_List (Decl_Node);
11502 -- Flag actual derived types so their elaboration produces the
11503 -- appropriate renamings for the primitive operations of the ancestor.
11504 -- Flag actual for formal private types as well, to determine whether
11505 -- operations in the private part may override inherited operations.
11506 -- If the formal has an interface list, the ancestor is not the
11507 -- parent, but the analyzed formal that includes the interface
11508 -- operations of all its progenitors.
11510 -- Same treatment for formal private types, so we can check whether the
11511 -- type is tagged limited when validating derivations in the private
11512 -- part. (See AI05-096).
11514 if Nkind (Def) = N_Formal_Derived_Type_Definition then
11515 if Present (Interface_List (Def)) then
11516 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11518 Set_Generic_Parent_Type (Decl_Node, Ancestor);
11521 elsif Nkind_In (Def,
11522 N_Formal_Private_Type_Definition,
11523 N_Formal_Incomplete_Type_Definition)
11525 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
11528 -- If the actual is a synchronized type that implements an interface,
11529 -- the primitive operations are attached to the corresponding record,
11530 -- and we have to treat it as an additional generic actual, so that its
11531 -- primitive operations become visible in the instance. The task or
11532 -- protected type itself does not carry primitive operations.
11534 if Is_Concurrent_Type (Act_T)
11535 and then Is_Tagged_Type (Act_T)
11536 and then Present (Corresponding_Record_Type (Act_T))
11537 and then Present (Ancestor)
11538 and then Is_Interface (Ancestor)
11541 Corr_Rec : constant Entity_Id :=
11542 Corresponding_Record_Type (Act_T);
11543 New_Corr : Entity_Id;
11544 Corr_Decl : Node_Id;
11547 New_Corr := Make_Temporary (Loc, 'S');
11549 Make_Subtype_Declaration (Loc,
11550 Defining_Identifier => New_Corr,
11551 Subtype_Indication =>
11552 New_Reference_To (Corr_Rec, Loc));
11553 Append_To (Decl_Nodes, Corr_Decl);
11555 if Ekind (Act_T) = E_Task_Type then
11556 Set_Ekind (Subt, E_Task_Subtype);
11558 Set_Ekind (Subt, E_Protected_Subtype);
11561 Set_Corresponding_Record_Type (Subt, Corr_Rec);
11562 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
11563 Set_Generic_Parent_Type (Decl_Node, Empty);
11568 end Instantiate_Type;
11570 ---------------------
11571 -- Is_In_Main_Unit --
11572 ---------------------
11574 function Is_In_Main_Unit (N : Node_Id) return Boolean is
11575 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
11576 Current_Unit : Node_Id;
11579 if Unum = Main_Unit then
11582 -- If the current unit is a subunit then it is either the main unit or
11583 -- is being compiled as part of the main unit.
11585 elsif Nkind (N) = N_Compilation_Unit then
11586 return Nkind (Unit (N)) = N_Subunit;
11589 Current_Unit := Parent (N);
11590 while Present (Current_Unit)
11591 and then Nkind (Current_Unit) /= N_Compilation_Unit
11593 Current_Unit := Parent (Current_Unit);
11596 -- The instantiation node is in the main unit, or else the current node
11597 -- (perhaps as the result of nested instantiations) is in the main unit,
11598 -- or in the declaration of the main unit, which in this last case must
11601 return Unum = Main_Unit
11602 or else Current_Unit = Cunit (Main_Unit)
11603 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
11604 or else (Present (Library_Unit (Current_Unit))
11605 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
11606 end Is_In_Main_Unit;
11608 ----------------------------
11609 -- Load_Parent_Of_Generic --
11610 ----------------------------
11612 procedure Load_Parent_Of_Generic
11615 Body_Optional : Boolean := False)
11617 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
11618 Save_Style_Check : constant Boolean := Style_Check;
11619 True_Parent : Node_Id;
11620 Inst_Node : Node_Id;
11622 Previous_Instances : constant Elist_Id := New_Elmt_List;
11624 procedure Collect_Previous_Instances (Decls : List_Id);
11625 -- Collect all instantiations in the given list of declarations, that
11626 -- precede the generic that we need to load. If the bodies of these
11627 -- instantiations are available, we must analyze them, to ensure that
11628 -- the public symbols generated are the same when the unit is compiled
11629 -- to generate code, and when it is compiled in the context of a unit
11630 -- that needs a particular nested instance. This process is applied to
11631 -- both package and subprogram instances.
11633 --------------------------------
11634 -- Collect_Previous_Instances --
11635 --------------------------------
11637 procedure Collect_Previous_Instances (Decls : List_Id) is
11641 Decl := First (Decls);
11642 while Present (Decl) loop
11643 if Sloc (Decl) >= Sloc (Inst_Node) then
11646 -- If Decl is an instantiation, then record it as requiring
11647 -- instantiation of the corresponding body, except if it is an
11648 -- abbreviated instantiation generated internally for conformance
11649 -- checking purposes only for the case of a formal package
11650 -- declared without a box (see Instantiate_Formal_Package). Such
11651 -- an instantiation does not generate any code (the actual code
11652 -- comes from actual) and thus does not need to be analyzed here.
11653 -- If the instantiation appears with a generic package body it is
11654 -- not analyzed here either.
11656 elsif Nkind (Decl) = N_Package_Instantiation
11657 and then not Is_Internal (Defining_Entity (Decl))
11659 Append_Elmt (Decl, Previous_Instances);
11661 -- For a subprogram instantiation, omit instantiations intrinsic
11662 -- operations (Unchecked_Conversions, etc.) that have no bodies.
11664 elsif Nkind_In (Decl, N_Function_Instantiation,
11665 N_Procedure_Instantiation)
11666 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
11668 Append_Elmt (Decl, Previous_Instances);
11670 elsif Nkind (Decl) = N_Package_Declaration then
11671 Collect_Previous_Instances
11672 (Visible_Declarations (Specification (Decl)));
11673 Collect_Previous_Instances
11674 (Private_Declarations (Specification (Decl)));
11676 -- Previous non-generic bodies may contain instances as well
11678 elsif Nkind (Decl) = N_Package_Body
11679 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
11681 Collect_Previous_Instances (Declarations (Decl));
11683 elsif Nkind (Decl) = N_Subprogram_Body
11684 and then not Acts_As_Spec (Decl)
11685 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
11687 Collect_Previous_Instances (Declarations (Decl));
11692 end Collect_Previous_Instances;
11694 -- Start of processing for Load_Parent_Of_Generic
11697 if not In_Same_Source_Unit (N, Spec)
11698 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
11699 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
11700 and then not Is_In_Main_Unit (Spec))
11702 -- Find body of parent of spec, and analyze it. A special case arises
11703 -- when the parent is an instantiation, that is to say when we are
11704 -- currently instantiating a nested generic. In that case, there is
11705 -- no separate file for the body of the enclosing instance. Instead,
11706 -- the enclosing body must be instantiated as if it were a pending
11707 -- instantiation, in order to produce the body for the nested generic
11708 -- we require now. Note that in that case the generic may be defined
11709 -- in a package body, the instance defined in the same package body,
11710 -- and the original enclosing body may not be in the main unit.
11712 Inst_Node := Empty;
11714 True_Parent := Parent (Spec);
11715 while Present (True_Parent)
11716 and then Nkind (True_Parent) /= N_Compilation_Unit
11718 if Nkind (True_Parent) = N_Package_Declaration
11720 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
11722 -- Parent is a compilation unit that is an instantiation.
11723 -- Instantiation node has been replaced with package decl.
11725 Inst_Node := Original_Node (True_Parent);
11728 elsif Nkind (True_Parent) = N_Package_Declaration
11729 and then Present (Generic_Parent (Specification (True_Parent)))
11730 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11732 -- Parent is an instantiation within another specification.
11733 -- Declaration for instance has been inserted before original
11734 -- instantiation node. A direct link would be preferable?
11736 Inst_Node := Next (True_Parent);
11737 while Present (Inst_Node)
11738 and then Nkind (Inst_Node) /= N_Package_Instantiation
11743 -- If the instance appears within a generic, and the generic
11744 -- unit is defined within a formal package of the enclosing
11745 -- generic, there is no generic body available, and none
11746 -- needed. A more precise test should be used ???
11748 if No (Inst_Node) then
11755 True_Parent := Parent (True_Parent);
11759 -- Case where we are currently instantiating a nested generic
11761 if Present (Inst_Node) then
11762 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
11764 -- Instantiation node and declaration of instantiated package
11765 -- were exchanged when only the declaration was needed.
11766 -- Restore instantiation node before proceeding with body.
11768 Set_Unit (Parent (True_Parent), Inst_Node);
11771 -- Now complete instantiation of enclosing body, if it appears in
11772 -- some other unit. If it appears in the current unit, the body
11773 -- will have been instantiated already.
11775 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
11777 -- We need to determine the expander mode to instantiate the
11778 -- enclosing body. Because the generic body we need may use
11779 -- global entities declared in the enclosing package (including
11780 -- aggregates) it is in general necessary to compile this body
11781 -- with expansion enabled, except if we are within a generic
11782 -- package, in which case the usual generic rule applies.
11785 Exp_Status : Boolean := True;
11789 -- Loop through scopes looking for generic package
11791 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
11792 while Present (Scop)
11793 and then Scop /= Standard_Standard
11795 if Ekind (Scop) = E_Generic_Package then
11796 Exp_Status := False;
11800 Scop := Scope (Scop);
11803 -- Collect previous instantiations in the unit that contains
11804 -- the desired generic.
11806 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11807 and then not Body_Optional
11811 Info : Pending_Body_Info;
11815 Par := Parent (Inst_Node);
11816 while Present (Par) loop
11817 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
11818 Par := Parent (Par);
11821 pragma Assert (Present (Par));
11823 if Nkind (Par) = N_Package_Body then
11824 Collect_Previous_Instances (Declarations (Par));
11826 elsif Nkind (Par) = N_Package_Declaration then
11827 Collect_Previous_Instances
11828 (Visible_Declarations (Specification (Par)));
11829 Collect_Previous_Instances
11830 (Private_Declarations (Specification (Par)));
11833 -- Enclosing unit is a subprogram body. In this
11834 -- case all instance bodies are processed in order
11835 -- and there is no need to collect them separately.
11840 Decl := First_Elmt (Previous_Instances);
11841 while Present (Decl) loop
11843 (Inst_Node => Node (Decl),
11845 Instance_Spec (Node (Decl)),
11846 Expander_Status => Exp_Status,
11847 Current_Sem_Unit =>
11848 Get_Code_Unit (Sloc (Node (Decl))),
11849 Scope_Suppress => Scope_Suppress,
11850 Local_Suppress_Stack_Top =>
11851 Local_Suppress_Stack_Top,
11852 Version => Ada_Version);
11854 -- Package instance
11857 Nkind (Node (Decl)) = N_Package_Instantiation
11859 Instantiate_Package_Body
11860 (Info, Body_Optional => True);
11862 -- Subprogram instance
11865 -- The instance_spec is the wrapper package,
11866 -- and the subprogram declaration is the last
11867 -- declaration in the wrapper.
11871 (Visible_Declarations
11872 (Specification (Info.Act_Decl)));
11874 Instantiate_Subprogram_Body
11875 (Info, Body_Optional => True);
11883 Instantiate_Package_Body
11885 ((Inst_Node => Inst_Node,
11886 Act_Decl => True_Parent,
11887 Expander_Status => Exp_Status,
11888 Current_Sem_Unit =>
11889 Get_Code_Unit (Sloc (Inst_Node)),
11890 Scope_Suppress => Scope_Suppress,
11891 Local_Suppress_Stack_Top =>
11892 Local_Suppress_Stack_Top,
11893 Version => Ada_Version)),
11894 Body_Optional => Body_Optional);
11898 -- Case where we are not instantiating a nested generic
11901 Opt.Style_Check := False;
11902 Expander_Mode_Save_And_Set (True);
11903 Load_Needed_Body (Comp_Unit, OK);
11904 Opt.Style_Check := Save_Style_Check;
11905 Expander_Mode_Restore;
11908 and then Unit_Requires_Body (Defining_Entity (Spec))
11909 and then not Body_Optional
11912 Bname : constant Unit_Name_Type :=
11913 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
11916 -- In CodePeer mode, the missing body may make the analysis
11917 -- incomplete, but we do not treat it as fatal.
11919 if CodePeer_Mode then
11923 Error_Msg_Unit_1 := Bname;
11924 Error_Msg_N ("this instantiation requires$!", N);
11925 Error_Msg_File_1 :=
11926 Get_File_Name (Bname, Subunit => False);
11927 Error_Msg_N ("\but file{ was not found!", N);
11928 raise Unrecoverable_Error;
11935 -- If loading parent of the generic caused an instantiation circularity,
11936 -- we abandon compilation at this point, because otherwise in some cases
11937 -- we get into trouble with infinite recursions after this point.
11939 if Circularity_Detected then
11940 raise Unrecoverable_Error;
11942 end Load_Parent_Of_Generic;
11944 ---------------------------------
11945 -- Map_Formal_Package_Entities --
11946 ---------------------------------
11948 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
11953 Set_Instance_Of (Form, Act);
11955 -- Traverse formal and actual package to map the corresponding entities.
11956 -- We skip over internal entities that may be generated during semantic
11957 -- analysis, and find the matching entities by name, given that they
11958 -- must appear in the same order.
11960 E1 := First_Entity (Form);
11961 E2 := First_Entity (Act);
11962 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
11963 -- Could this test be a single condition???
11964 -- Seems like it could, and isn't FPE (Form) a constant anyway???
11966 if not Is_Internal (E1)
11967 and then Present (Parent (E1))
11968 and then not Is_Class_Wide_Type (E1)
11969 and then not Is_Internal_Name (Chars (E1))
11971 while Present (E2) and then Chars (E2) /= Chars (E1) loop
11978 Set_Instance_Of (E1, E2);
11980 if Is_Type (E1) and then Is_Tagged_Type (E2) then
11981 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
11984 if Is_Constrained (E1) then
11985 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
11988 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
11989 Map_Formal_Package_Entities (E1, E2);
11996 end Map_Formal_Package_Entities;
11998 -----------------------
11999 -- Move_Freeze_Nodes --
12000 -----------------------
12002 procedure Move_Freeze_Nodes
12003 (Out_Of : Entity_Id;
12008 Next_Decl : Node_Id;
12009 Next_Node : Node_Id := After;
12012 function Is_Outer_Type (T : Entity_Id) return Boolean;
12013 -- Check whether entity is declared in a scope external to that of the
12016 -------------------
12017 -- Is_Outer_Type --
12018 -------------------
12020 function Is_Outer_Type (T : Entity_Id) return Boolean is
12021 Scop : Entity_Id := Scope (T);
12024 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
12028 while Scop /= Standard_Standard loop
12029 if Scop = Out_Of then
12032 Scop := Scope (Scop);
12040 -- Start of processing for Move_Freeze_Nodes
12047 -- First remove the freeze nodes that may appear before all other
12051 while Present (Decl)
12052 and then Nkind (Decl) = N_Freeze_Entity
12053 and then Is_Outer_Type (Entity (Decl))
12055 Decl := Remove_Head (L);
12056 Insert_After (Next_Node, Decl);
12057 Set_Analyzed (Decl, False);
12062 -- Next scan the list of declarations and remove each freeze node that
12063 -- appears ahead of the current node.
12065 while Present (Decl) loop
12066 while Present (Next (Decl))
12067 and then Nkind (Next (Decl)) = N_Freeze_Entity
12068 and then Is_Outer_Type (Entity (Next (Decl)))
12070 Next_Decl := Remove_Next (Decl);
12071 Insert_After (Next_Node, Next_Decl);
12072 Set_Analyzed (Next_Decl, False);
12073 Next_Node := Next_Decl;
12076 -- If the declaration is a nested package or concurrent type, then
12077 -- recurse. Nested generic packages will have been processed from the
12080 case Nkind (Decl) is
12081 when N_Package_Declaration =>
12082 Spec := Specification (Decl);
12084 when N_Task_Type_Declaration =>
12085 Spec := Task_Definition (Decl);
12087 when N_Protected_Type_Declaration =>
12088 Spec := Protected_Definition (Decl);
12094 if Present (Spec) then
12095 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
12096 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
12101 end Move_Freeze_Nodes;
12107 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
12109 return Generic_Renamings.Table (E).Next_In_HTable;
12112 ------------------------
12113 -- Preanalyze_Actuals --
12114 ------------------------
12116 procedure Preanalyze_Actuals (N : Node_Id) is
12119 Errs : constant Int := Serious_Errors_Detected;
12121 Cur : Entity_Id := Empty;
12122 -- Current homograph of the instance name
12125 -- Saved visibility status of the current homograph
12128 Assoc := First (Generic_Associations (N));
12130 -- If the instance is a child unit, its name may hide an outer homonym,
12131 -- so make it invisible to perform name resolution on the actuals.
12133 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
12135 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
12137 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
12139 if Is_Compilation_Unit (Cur) then
12140 Vis := Is_Immediately_Visible (Cur);
12141 Set_Is_Immediately_Visible (Cur, False);
12147 while Present (Assoc) loop
12148 if Nkind (Assoc) /= N_Others_Choice then
12149 Act := Explicit_Generic_Actual_Parameter (Assoc);
12151 -- Within a nested instantiation, a defaulted actual is an empty
12152 -- association, so nothing to analyze. If the subprogram actual
12153 -- is an attribute, analyze prefix only, because actual is not a
12154 -- complete attribute reference.
12156 -- If actual is an allocator, analyze expression only. The full
12157 -- analysis can generate code, and if instance is a compilation
12158 -- unit we have to wait until the package instance is installed
12159 -- to have a proper place to insert this code.
12161 -- String literals may be operators, but at this point we do not
12162 -- know whether the actual is a formal subprogram or a string.
12167 elsif Nkind (Act) = N_Attribute_Reference then
12168 Analyze (Prefix (Act));
12170 elsif Nkind (Act) = N_Explicit_Dereference then
12171 Analyze (Prefix (Act));
12173 elsif Nkind (Act) = N_Allocator then
12175 Expr : constant Node_Id := Expression (Act);
12178 if Nkind (Expr) = N_Subtype_Indication then
12179 Analyze (Subtype_Mark (Expr));
12181 -- Analyze separately each discriminant constraint, when
12182 -- given with a named association.
12188 Constr := First (Constraints (Constraint (Expr)));
12189 while Present (Constr) loop
12190 if Nkind (Constr) = N_Discriminant_Association then
12191 Analyze (Expression (Constr));
12205 elsif Nkind (Act) /= N_Operator_Symbol then
12209 if Errs /= Serious_Errors_Detected then
12211 -- Do a minimal analysis of the generic, to prevent spurious
12212 -- warnings complaining about the generic being unreferenced,
12213 -- before abandoning the instantiation.
12215 Analyze (Name (N));
12217 if Is_Entity_Name (Name (N))
12218 and then Etype (Name (N)) /= Any_Type
12220 Generate_Reference (Entity (Name (N)), Name (N));
12221 Set_Is_Instantiated (Entity (Name (N)));
12224 if Present (Cur) then
12226 -- For the case of a child instance hiding an outer homonym,
12227 -- provide additional warning which might explain the error.
12229 Set_Is_Immediately_Visible (Cur, Vis);
12230 Error_Msg_NE ("& hides outer unit with the same name?",
12231 N, Defining_Unit_Name (N));
12234 Abandon_Instantiation (Act);
12241 if Present (Cur) then
12242 Set_Is_Immediately_Visible (Cur, Vis);
12244 end Preanalyze_Actuals;
12246 -------------------
12247 -- Remove_Parent --
12248 -------------------
12250 procedure Remove_Parent (In_Body : Boolean := False) is
12251 S : Entity_Id := Current_Scope;
12252 -- S is the scope containing the instantiation just completed. The scope
12253 -- stack contains the parent instances of the instantiation, followed by
12262 -- After child instantiation is complete, remove from scope stack the
12263 -- extra copy of the current scope, and then remove parent instances.
12265 if not In_Body then
12268 while Current_Scope /= S loop
12269 P := Current_Scope;
12270 End_Package_Scope (Current_Scope);
12272 if In_Open_Scopes (P) then
12273 E := First_Entity (P);
12274 while Present (E) loop
12275 Set_Is_Immediately_Visible (E, True);
12279 -- If instantiation is declared in a block, it is the enclosing
12280 -- scope that might be a parent instance. Note that only one
12281 -- block can be involved, because the parent instances have
12282 -- been installed within it.
12284 if Ekind (P) = E_Block then
12285 Cur_P := Scope (P);
12290 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
12291 -- We are within an instance of some sibling. Retain
12292 -- visibility of parent, for proper subsequent cleanup, and
12293 -- reinstall private declarations as well.
12295 Set_In_Private_Part (P);
12296 Install_Private_Declarations (P);
12299 -- If the ultimate parent is a top-level unit recorded in
12300 -- Instance_Parent_Unit, then reset its visibility to what it was
12301 -- before instantiation. (It's not clear what the purpose is of
12302 -- testing whether Scope (P) is In_Open_Scopes, but that test was
12303 -- present before the ultimate parent test was added.???)
12305 elsif not In_Open_Scopes (Scope (P))
12306 or else (P = Instance_Parent_Unit
12307 and then not Parent_Unit_Visible)
12309 Set_Is_Immediately_Visible (P, False);
12311 -- If the current scope is itself an instantiation of a generic
12312 -- nested within P, and we are in the private part of body of this
12313 -- instantiation, restore the full views of P, that were removed
12314 -- in End_Package_Scope above. This obscure case can occur when a
12315 -- subunit of a generic contains an instance of a child unit of
12316 -- its generic parent unit.
12318 elsif S = Current_Scope and then Is_Generic_Instance (S) then
12320 Par : constant Entity_Id :=
12322 (Specification (Unit_Declaration_Node (S)));
12325 and then P = Scope (Par)
12326 and then (In_Package_Body (S) or else In_Private_Part (S))
12328 Set_In_Private_Part (P);
12329 Install_Private_Declarations (P);
12335 -- Reset visibility of entities in the enclosing scope
12337 Set_Is_Hidden_Open_Scope (Current_Scope, False);
12339 Hidden := First_Elmt (Hidden_Entities);
12340 while Present (Hidden) loop
12341 Set_Is_Immediately_Visible (Node (Hidden), True);
12342 Next_Elmt (Hidden);
12346 -- Each body is analyzed separately, and there is no context that
12347 -- needs preserving from one body instance to the next, so remove all
12348 -- parent scopes that have been installed.
12350 while Present (S) loop
12351 End_Package_Scope (S);
12352 Set_Is_Immediately_Visible (S, False);
12353 S := Current_Scope;
12354 exit when S = Standard_Standard;
12363 procedure Restore_Env is
12364 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
12367 if No (Current_Instantiated_Parent.Act_Id) then
12368 -- Restore environment after subprogram inlining
12370 Restore_Private_Views (Empty);
12373 Current_Instantiated_Parent := Saved.Instantiated_Parent;
12374 Exchanged_Views := Saved.Exchanged_Views;
12375 Hidden_Entities := Saved.Hidden_Entities;
12376 Current_Sem_Unit := Saved.Current_Sem_Unit;
12377 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
12378 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
12380 Restore_Opt_Config_Switches (Saved.Switches);
12382 Instance_Envs.Decrement_Last;
12385 ---------------------------
12386 -- Restore_Private_Views --
12387 ---------------------------
12389 procedure Restore_Private_Views
12390 (Pack_Id : Entity_Id;
12391 Is_Package : Boolean := True)
12396 Dep_Elmt : Elmt_Id;
12399 procedure Restore_Nested_Formal (Formal : Entity_Id);
12400 -- Hide the generic formals of formal packages declared with box which
12401 -- were reachable in the current instantiation.
12403 ---------------------------
12404 -- Restore_Nested_Formal --
12405 ---------------------------
12407 procedure Restore_Nested_Formal (Formal : Entity_Id) is
12411 if Present (Renamed_Object (Formal))
12412 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
12416 elsif Present (Associated_Formal_Package (Formal)) then
12417 Ent := First_Entity (Formal);
12418 while Present (Ent) loop
12419 exit when Ekind (Ent) = E_Package
12420 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
12422 Set_Is_Hidden (Ent);
12423 Set_Is_Potentially_Use_Visible (Ent, False);
12425 -- If package, then recurse
12427 if Ekind (Ent) = E_Package then
12428 Restore_Nested_Formal (Ent);
12434 end Restore_Nested_Formal;
12436 -- Start of processing for Restore_Private_Views
12439 M := First_Elmt (Exchanged_Views);
12440 while Present (M) loop
12443 -- Subtypes of types whose views have been exchanged, and that are
12444 -- defined within the instance, were not on the Private_Dependents
12445 -- list on entry to the instance, so they have to be exchanged
12446 -- explicitly now, in order to remain consistent with the view of the
12449 if Ekind_In (Typ, E_Private_Type,
12450 E_Limited_Private_Type,
12451 E_Record_Type_With_Private)
12453 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
12454 while Present (Dep_Elmt) loop
12455 Dep_Typ := Node (Dep_Elmt);
12457 if Scope (Dep_Typ) = Pack_Id
12458 and then Present (Full_View (Dep_Typ))
12460 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
12461 Exchange_Declarations (Dep_Typ);
12464 Next_Elmt (Dep_Elmt);
12468 Exchange_Declarations (Node (M));
12472 if No (Pack_Id) then
12476 -- Make the generic formal parameters private, and make the formal types
12477 -- into subtypes of the actuals again.
12479 E := First_Entity (Pack_Id);
12480 while Present (E) loop
12481 Set_Is_Hidden (E, True);
12484 and then Nkind (Parent (E)) = N_Subtype_Declaration
12486 Set_Is_Generic_Actual_Type (E, False);
12488 -- An unusual case of aliasing: the actual may also be directly
12489 -- visible in the generic, and be private there, while it is fully
12490 -- visible in the context of the instance. The internal subtype
12491 -- is private in the instance but has full visibility like its
12492 -- parent in the enclosing scope. This enforces the invariant that
12493 -- the privacy status of all private dependents of a type coincide
12494 -- with that of the parent type. This can only happen when a
12495 -- generic child unit is instantiated within a sibling.
12497 if Is_Private_Type (E)
12498 and then not Is_Private_Type (Etype (E))
12500 Exchange_Declarations (E);
12503 elsif Ekind (E) = E_Package then
12505 -- The end of the renaming list is the renaming of the generic
12506 -- package itself. If the instance is a subprogram, all entities
12507 -- in the corresponding package are renamings. If this entity is
12508 -- a formal package, make its own formals private as well. The
12509 -- actual in this case is itself the renaming of an instantiation.
12510 -- If the entity is not a package renaming, it is the entity
12511 -- created to validate formal package actuals: ignore it.
12513 -- If the actual is itself a formal package for the enclosing
12514 -- generic, or the actual for such a formal package, it remains
12515 -- visible on exit from the instance, and therefore nothing needs
12516 -- to be done either, except to keep it accessible.
12518 if Is_Package and then Renamed_Object (E) = Pack_Id then
12521 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
12525 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
12527 Set_Is_Hidden (E, False);
12531 Act_P : constant Entity_Id := Renamed_Object (E);
12535 Id := First_Entity (Act_P);
12537 and then Id /= First_Private_Entity (Act_P)
12539 exit when Ekind (Id) = E_Package
12540 and then Renamed_Object (Id) = Act_P;
12542 Set_Is_Hidden (Id, True);
12543 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
12545 if Ekind (Id) = E_Package then
12546 Restore_Nested_Formal (Id);
12557 end Restore_Private_Views;
12564 (Gen_Unit : Entity_Id;
12565 Act_Unit : Entity_Id)
12569 Set_Instance_Env (Gen_Unit, Act_Unit);
12572 ----------------------------
12573 -- Save_Global_References --
12574 ----------------------------
12576 procedure Save_Global_References (N : Node_Id) is
12577 Gen_Scope : Entity_Id;
12581 function Is_Global (E : Entity_Id) return Boolean;
12582 -- Check whether entity is defined outside of generic unit. Examine the
12583 -- scope of an entity, and the scope of the scope, etc, until we find
12584 -- either Standard, in which case the entity is global, or the generic
12585 -- unit itself, which indicates that the entity is local. If the entity
12586 -- is the generic unit itself, as in the case of a recursive call, or
12587 -- the enclosing generic unit, if different from the current scope, then
12588 -- it is local as well, because it will be replaced at the point of
12589 -- instantiation. On the other hand, if it is a reference to a child
12590 -- unit of a common ancestor, which appears in an instantiation, it is
12591 -- global because it is used to denote a specific compilation unit at
12592 -- the time the instantiations will be analyzed.
12594 procedure Reset_Entity (N : Node_Id);
12595 -- Save semantic information on global entity so that it is not resolved
12596 -- again at instantiation time.
12598 procedure Save_Entity_Descendants (N : Node_Id);
12599 -- Apply Save_Global_References to the two syntactic descendants of
12600 -- non-terminal nodes that carry an Associated_Node and are processed
12601 -- through Reset_Entity. Once the global entity (if any) has been
12602 -- captured together with its type, only two syntactic descendants need
12603 -- to be traversed to complete the processing of the tree rooted at N.
12604 -- This applies to Selected_Components, Expanded_Names, and to Operator
12605 -- nodes. N can also be a character literal, identifier, or operator
12606 -- symbol node, but the call has no effect in these cases.
12608 procedure Save_Global_Defaults (N1, N2 : Node_Id);
12609 -- Default actuals in nested instances must be handled specially
12610 -- because there is no link to them from the original tree. When an
12611 -- actual subprogram is given by a default, we add an explicit generic
12612 -- association for it in the instantiation node. When we save the
12613 -- global references on the name of the instance, we recover the list
12614 -- of generic associations, and add an explicit one to the original
12615 -- generic tree, through which a global actual can be preserved.
12616 -- Similarly, if a child unit is instantiated within a sibling, in the
12617 -- context of the parent, we must preserve the identifier of the parent
12618 -- so that it can be properly resolved in a subsequent instantiation.
12620 procedure Save_Global_Descendant (D : Union_Id);
12621 -- Apply Save_Global_References recursively to the descendents of the
12624 procedure Save_References (N : Node_Id);
12625 -- This is the recursive procedure that does the work, once the
12626 -- enclosing generic scope has been established.
12632 function Is_Global (E : Entity_Id) return Boolean is
12635 function Is_Instance_Node (Decl : Node_Id) return Boolean;
12636 -- Determine whether the parent node of a reference to a child unit
12637 -- denotes an instantiation or a formal package, in which case the
12638 -- reference to the child unit is global, even if it appears within
12639 -- the current scope (e.g. when the instance appears within the body
12640 -- of an ancestor).
12642 ----------------------
12643 -- Is_Instance_Node --
12644 ----------------------
12646 function Is_Instance_Node (Decl : Node_Id) return Boolean is
12648 return Nkind (Decl) in N_Generic_Instantiation
12650 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
12651 end Is_Instance_Node;
12653 -- Start of processing for Is_Global
12656 if E = Gen_Scope then
12659 elsif E = Standard_Standard then
12662 elsif Is_Child_Unit (E)
12663 and then (Is_Instance_Node (Parent (N2))
12664 or else (Nkind (Parent (N2)) = N_Expanded_Name
12665 and then N2 = Selector_Name (Parent (N2))
12667 Is_Instance_Node (Parent (Parent (N2)))))
12673 while Se /= Gen_Scope loop
12674 if Se = Standard_Standard then
12689 procedure Reset_Entity (N : Node_Id) is
12691 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
12692 -- If the type of N2 is global to the generic unit, save the type in
12693 -- the generic node. Just as we perform name capture for explicit
12694 -- references within the generic, we must capture the global types
12695 -- of local entities because they may participate in resolution in
12698 function Top_Ancestor (E : Entity_Id) return Entity_Id;
12699 -- Find the ultimate ancestor of the current unit. If it is not a
12700 -- generic unit, then the name of the current unit in the prefix of
12701 -- an expanded name must be replaced with its generic homonym to
12702 -- ensure that it will be properly resolved in an instance.
12704 ---------------------
12705 -- Set_Global_Type --
12706 ---------------------
12708 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
12709 Typ : constant Entity_Id := Etype (N2);
12712 Set_Etype (N, Typ);
12714 if Entity (N) /= N2
12715 and then Has_Private_View (Entity (N))
12717 -- If the entity of N is not the associated node, this is a
12718 -- nested generic and it has an associated node as well, whose
12719 -- type is already the full view (see below). Indicate that the
12720 -- original node has a private view.
12722 Set_Has_Private_View (N);
12725 -- If not a private type, nothing else to do
12727 if not Is_Private_Type (Typ) then
12728 if Is_Array_Type (Typ)
12729 and then Is_Private_Type (Component_Type (Typ))
12731 Set_Has_Private_View (N);
12734 -- If it is a derivation of a private type in a context where no
12735 -- full view is needed, nothing to do either.
12737 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
12740 -- Otherwise mark the type for flipping and use the full view when
12744 Set_Has_Private_View (N);
12746 if Present (Full_View (Typ)) then
12747 Set_Etype (N2, Full_View (Typ));
12750 end Set_Global_Type;
12756 function Top_Ancestor (E : Entity_Id) return Entity_Id is
12761 while Is_Child_Unit (Par) loop
12762 Par := Scope (Par);
12768 -- Start of processing for Reset_Entity
12771 N2 := Get_Associated_Node (N);
12774 if Present (E) then
12776 -- If the node is an entry call to an entry in an enclosing task,
12777 -- it is rewritten as a selected component. No global entity to
12778 -- preserve in this case, since the expansion will be redone in
12781 if not Nkind_In (E, N_Defining_Identifier,
12782 N_Defining_Character_Literal,
12783 N_Defining_Operator_Symbol)
12785 Set_Associated_Node (N, Empty);
12786 Set_Etype (N, Empty);
12790 -- If the entity is an itype created as a subtype of an access
12791 -- type with a null exclusion restore source entity for proper
12792 -- visibility. The itype will be created anew in the instance.
12795 and then Ekind (E) = E_Access_Subtype
12796 and then Is_Entity_Name (N)
12797 and then Chars (Etype (E)) = Chars (N)
12800 Set_Entity (N2, E);
12804 if Is_Global (E) then
12805 Set_Global_Type (N, N2);
12807 elsif Nkind (N) = N_Op_Concat
12808 and then Is_Generic_Type (Etype (N2))
12809 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
12811 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
12812 and then Is_Intrinsic_Subprogram (E)
12817 -- Entity is local. Mark generic node as unresolved.
12818 -- Note that now it does not have an entity.
12820 Set_Associated_Node (N, Empty);
12821 Set_Etype (N, Empty);
12824 if Nkind (Parent (N)) in N_Generic_Instantiation
12825 and then N = Name (Parent (N))
12827 Save_Global_Defaults (Parent (N), Parent (N2));
12830 elsif Nkind (Parent (N)) = N_Selected_Component
12831 and then Nkind (Parent (N2)) = N_Expanded_Name
12833 if Is_Global (Entity (Parent (N2))) then
12834 Change_Selected_Component_To_Expanded_Name (Parent (N));
12835 Set_Associated_Node (Parent (N), Parent (N2));
12836 Set_Global_Type (Parent (N), Parent (N2));
12837 Save_Entity_Descendants (N);
12839 -- If this is a reference to the current generic entity, replace
12840 -- by the name of the generic homonym of the current package. This
12841 -- is because in an instantiation Par.P.Q will not resolve to the
12842 -- name of the instance, whose enclosing scope is not necessarily
12843 -- Par. We use the generic homonym rather that the name of the
12844 -- generic itself because it may be hidden by a local declaration.
12846 elsif In_Open_Scopes (Entity (Parent (N2)))
12848 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
12850 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
12851 Rewrite (Parent (N),
12852 Make_Identifier (Sloc (N),
12854 Chars (Generic_Homonym (Entity (Parent (N2))))));
12856 Rewrite (Parent (N),
12857 Make_Identifier (Sloc (N),
12858 Chars => Chars (Selector_Name (Parent (N2)))));
12862 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
12863 and then Parent (N) = Name (Parent (Parent (N)))
12865 Save_Global_Defaults
12866 (Parent (Parent (N)), Parent (Parent ((N2))));
12869 -- A selected component may denote a static constant that has been
12870 -- folded. If the static constant is global to the generic, capture
12871 -- its value. Otherwise the folding will happen in any instantiation.
12873 elsif Nkind (Parent (N)) = N_Selected_Component
12874 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
12876 if Present (Entity (Original_Node (Parent (N2))))
12877 and then Is_Global (Entity (Original_Node (Parent (N2))))
12879 Rewrite (Parent (N), New_Copy (Parent (N2)));
12880 Set_Analyzed (Parent (N), False);
12886 -- A selected component may be transformed into a parameterless
12887 -- function call. If the called entity is global, rewrite the node
12888 -- appropriately, i.e. as an extended name for the global entity.
12890 elsif Nkind (Parent (N)) = N_Selected_Component
12891 and then Nkind (Parent (N2)) = N_Function_Call
12892 and then N = Selector_Name (Parent (N))
12894 if No (Parameter_Associations (Parent (N2))) then
12895 if Is_Global (Entity (Name (Parent (N2)))) then
12896 Change_Selected_Component_To_Expanded_Name (Parent (N));
12897 Set_Associated_Node (Parent (N), Name (Parent (N2)));
12898 Set_Global_Type (Parent (N), Name (Parent (N2)));
12899 Save_Entity_Descendants (N);
12902 Set_Is_Prefixed_Call (Parent (N));
12903 Set_Associated_Node (N, Empty);
12904 Set_Etype (N, Empty);
12907 -- In Ada 2005, X.F may be a call to a primitive operation,
12908 -- rewritten as F (X). This rewriting will be done again in an
12909 -- instance, so keep the original node. Global entities will be
12910 -- captured as for other constructs. Indicate that this must
12911 -- resolve as a call, to prevent accidental overloading in the
12912 -- instance, if both a component and a primitive operation appear
12916 Set_Is_Prefixed_Call (Parent (N));
12919 -- Entity is local. Reset in generic unit, so that node is resolved
12920 -- anew at the point of instantiation.
12923 Set_Associated_Node (N, Empty);
12924 Set_Etype (N, Empty);
12928 -----------------------------
12929 -- Save_Entity_Descendants --
12930 -----------------------------
12932 procedure Save_Entity_Descendants (N : Node_Id) is
12935 when N_Binary_Op =>
12936 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
12937 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12940 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12942 when N_Expanded_Name | N_Selected_Component =>
12943 Save_Global_Descendant (Union_Id (Prefix (N)));
12944 Save_Global_Descendant (Union_Id (Selector_Name (N)));
12946 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
12950 raise Program_Error;
12952 end Save_Entity_Descendants;
12954 --------------------------
12955 -- Save_Global_Defaults --
12956 --------------------------
12958 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
12959 Loc : constant Source_Ptr := Sloc (N1);
12960 Assoc2 : constant List_Id := Generic_Associations (N2);
12961 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
12968 Actual : Entity_Id;
12971 Assoc1 := Generic_Associations (N1);
12973 if Present (Assoc1) then
12974 Act1 := First (Assoc1);
12977 Set_Generic_Associations (N1, New_List);
12978 Assoc1 := Generic_Associations (N1);
12981 if Present (Assoc2) then
12982 Act2 := First (Assoc2);
12987 while Present (Act1) and then Present (Act2) loop
12992 -- Find the associations added for default subprograms
12994 if Present (Act2) then
12995 while Nkind (Act2) /= N_Generic_Association
12996 or else No (Entity (Selector_Name (Act2)))
12997 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
13002 -- Add a similar association if the default is global. The
13003 -- renaming declaration for the actual has been analyzed, and
13004 -- its alias is the program it renames. Link the actual in the
13005 -- original generic tree with the node in the analyzed tree.
13007 while Present (Act2) loop
13008 Subp := Entity (Selector_Name (Act2));
13009 Def := Explicit_Generic_Actual_Parameter (Act2);
13011 -- Following test is defence against rubbish errors
13013 if No (Alias (Subp)) then
13017 -- Retrieve the resolved actual from the renaming declaration
13018 -- created for the instantiated formal.
13020 Actual := Entity (Name (Parent (Parent (Subp))));
13021 Set_Entity (Def, Actual);
13022 Set_Etype (Def, Etype (Actual));
13024 if Is_Global (Actual) then
13026 Make_Generic_Association (Loc,
13027 Selector_Name => New_Occurrence_Of (Subp, Loc),
13028 Explicit_Generic_Actual_Parameter =>
13029 New_Occurrence_Of (Actual, Loc));
13031 Set_Associated_Node
13032 (Explicit_Generic_Actual_Parameter (Ndec), Def);
13034 Append (Ndec, Assoc1);
13036 -- If there are other defaults, add a dummy association in case
13037 -- there are other defaulted formals with the same name.
13039 elsif Present (Next (Act2)) then
13041 Make_Generic_Association (Loc,
13042 Selector_Name => New_Occurrence_Of (Subp, Loc),
13043 Explicit_Generic_Actual_Parameter => Empty);
13045 Append (Ndec, Assoc1);
13052 if Nkind (Name (N1)) = N_Identifier
13053 and then Is_Child_Unit (Gen_Id)
13054 and then Is_Global (Gen_Id)
13055 and then Is_Generic_Unit (Scope (Gen_Id))
13056 and then In_Open_Scopes (Scope (Gen_Id))
13058 -- This is an instantiation of a child unit within a sibling, so
13059 -- that the generic parent is in scope. An eventual instance must
13060 -- occur within the scope of an instance of the parent. Make name
13061 -- in instance into an expanded name, to preserve the identifier
13062 -- of the parent, so it can be resolved subsequently.
13064 Rewrite (Name (N2),
13065 Make_Expanded_Name (Loc,
13066 Chars => Chars (Gen_Id),
13067 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13068 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13069 Set_Entity (Name (N2), Gen_Id);
13071 Rewrite (Name (N1),
13072 Make_Expanded_Name (Loc,
13073 Chars => Chars (Gen_Id),
13074 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
13075 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
13077 Set_Associated_Node (Name (N1), Name (N2));
13078 Set_Associated_Node (Prefix (Name (N1)), Empty);
13079 Set_Associated_Node
13080 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
13081 Set_Etype (Name (N1), Etype (Gen_Id));
13084 end Save_Global_Defaults;
13086 ----------------------------
13087 -- Save_Global_Descendant --
13088 ----------------------------
13090 procedure Save_Global_Descendant (D : Union_Id) is
13094 if D in Node_Range then
13095 if D = Union_Id (Empty) then
13098 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
13099 Save_References (Node_Id (D));
13102 elsif D in List_Range then
13103 if D = Union_Id (No_List)
13104 or else Is_Empty_List (List_Id (D))
13109 N1 := First (List_Id (D));
13110 while Present (N1) loop
13111 Save_References (N1);
13116 -- Element list or other non-node field, nothing to do
13121 end Save_Global_Descendant;
13123 ---------------------
13124 -- Save_References --
13125 ---------------------
13127 -- This is the recursive procedure that does the work once the enclosing
13128 -- generic scope has been established. We have to treat specially a
13129 -- number of node rewritings that are required by semantic processing
13130 -- and which change the kind of nodes in the generic copy: typically
13131 -- constant-folding, replacing an operator node by a string literal, or
13132 -- a selected component by an expanded name. In each of those cases, the
13133 -- transformation is propagated to the generic unit.
13135 procedure Save_References (N : Node_Id) is
13136 Loc : constant Source_Ptr := Sloc (N);
13142 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
13143 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13146 elsif Nkind (N) = N_Operator_Symbol
13147 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
13149 Change_Operator_Symbol_To_String_Literal (N);
13152 elsif Nkind (N) in N_Op then
13153 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13154 if Nkind (N) = N_Op_Concat then
13155 Set_Is_Component_Left_Opnd (N,
13156 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13158 Set_Is_Component_Right_Opnd (N,
13159 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13165 -- Node may be transformed into call to a user-defined operator
13167 N2 := Get_Associated_Node (N);
13169 if Nkind (N2) = N_Function_Call then
13170 E := Entity (Name (N2));
13173 and then Is_Global (E)
13175 Set_Etype (N, Etype (N2));
13177 Set_Associated_Node (N, Empty);
13178 Set_Etype (N, Empty);
13181 elsif Nkind_In (N2, N_Integer_Literal,
13185 if Present (Original_Node (N2))
13186 and then Nkind (Original_Node (N2)) = Nkind (N)
13189 -- Operation was constant-folded. Whenever possible,
13190 -- recover semantic information from unfolded node,
13193 Set_Associated_Node (N, Original_Node (N2));
13195 if Nkind (N) = N_Op_Concat then
13196 Set_Is_Component_Left_Opnd (N,
13197 Is_Component_Left_Opnd (Get_Associated_Node (N)));
13198 Set_Is_Component_Right_Opnd (N,
13199 Is_Component_Right_Opnd (Get_Associated_Node (N)));
13205 -- If original node is already modified, propagate
13206 -- constant-folding to template.
13208 Rewrite (N, New_Copy (N2));
13209 Set_Analyzed (N, False);
13212 elsif Nkind (N2) = N_Identifier
13213 and then Ekind (Entity (N2)) = E_Enumeration_Literal
13215 -- Same if call was folded into a literal, but in this case
13216 -- retain the entity to avoid spurious ambiguities if it is
13217 -- overloaded at the point of instantiation or inlining.
13219 Rewrite (N, New_Copy (N2));
13220 Set_Analyzed (N, False);
13224 -- Complete operands check if node has not been constant-folded
13226 if Nkind (N) in N_Op then
13227 Save_Entity_Descendants (N);
13230 elsif Nkind (N) = N_Identifier then
13231 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
13233 -- If this is a discriminant reference, always save it. It is
13234 -- used in the instance to find the corresponding discriminant
13235 -- positionally rather than by name.
13237 Set_Original_Discriminant
13238 (N, Original_Discriminant (Get_Associated_Node (N)));
13242 N2 := Get_Associated_Node (N);
13244 if Nkind (N2) = N_Function_Call then
13245 E := Entity (Name (N2));
13247 -- Name resolves to a call to parameterless function. If
13248 -- original entity is global, mark node as resolved.
13251 and then Is_Global (E)
13253 Set_Etype (N, Etype (N2));
13255 Set_Associated_Node (N, Empty);
13256 Set_Etype (N, Empty);
13259 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
13260 and then Is_Entity_Name (Original_Node (N2))
13262 -- Name resolves to named number that is constant-folded,
13263 -- We must preserve the original name for ASIS use, and
13264 -- undo the constant-folding, which will be repeated in
13267 Set_Associated_Node (N, Original_Node (N2));
13270 elsif Nkind (N2) = N_String_Literal then
13272 -- Name resolves to string literal. Perform the same
13273 -- replacement in generic.
13275 Rewrite (N, New_Copy (N2));
13277 elsif Nkind (N2) = N_Explicit_Dereference then
13279 -- An identifier is rewritten as a dereference if it is the
13280 -- prefix in an implicit dereference (call or attribute).
13281 -- The analysis of an instantiation will expand the node
13282 -- again, so we preserve the original tree but link it to
13283 -- the resolved entity in case it is global.
13285 if Is_Entity_Name (Prefix (N2))
13286 and then Present (Entity (Prefix (N2)))
13287 and then Is_Global (Entity (Prefix (N2)))
13289 Set_Associated_Node (N, Prefix (N2));
13291 elsif Nkind (Prefix (N2)) = N_Function_Call
13292 and then Is_Global (Entity (Name (Prefix (N2))))
13295 Make_Explicit_Dereference (Loc,
13296 Prefix => Make_Function_Call (Loc,
13298 New_Occurrence_Of (Entity (Name (Prefix (N2))),
13302 Set_Associated_Node (N, Empty);
13303 Set_Etype (N, Empty);
13306 -- The subtype mark of a nominally unconstrained object is
13307 -- rewritten as a subtype indication using the bounds of the
13308 -- expression. Recover the original subtype mark.
13310 elsif Nkind (N2) = N_Subtype_Indication
13311 and then Is_Entity_Name (Original_Node (N2))
13313 Set_Associated_Node (N, Original_Node (N2));
13321 elsif Nkind (N) in N_Entity then
13326 Qual : Node_Id := Empty;
13327 Typ : Entity_Id := Empty;
13330 use Atree.Unchecked_Access;
13331 -- This code section is part of implementing an untyped tree
13332 -- traversal, so it needs direct access to node fields.
13335 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
13336 N2 := Get_Associated_Node (N);
13343 -- In an instance within a generic, use the name of the
13344 -- actual and not the original generic parameter. If the
13345 -- actual is global in the current generic it must be
13346 -- preserved for its instantiation.
13348 if Nkind (Parent (Typ)) = N_Subtype_Declaration
13350 Present (Generic_Parent_Type (Parent (Typ)))
13352 Typ := Base_Type (Typ);
13353 Set_Etype (N2, Typ);
13359 or else not Is_Global (Typ)
13361 Set_Associated_Node (N, Empty);
13363 -- If the aggregate is an actual in a call, it has been
13364 -- resolved in the current context, to some local type.
13365 -- The enclosing call may have been disambiguated by the
13366 -- aggregate, and this disambiguation might fail at
13367 -- instantiation time because the type to which the
13368 -- aggregate did resolve is not preserved. In order to
13369 -- preserve some of this information, we wrap the
13370 -- aggregate in a qualified expression, using the id of
13371 -- its type. For further disambiguation we qualify the
13372 -- type name with its scope (if visible) because both
13373 -- id's will have corresponding entities in an instance.
13374 -- This resolves most of the problems with missing type
13375 -- information on aggregates in instances.
13377 if Nkind (N2) = Nkind (N)
13379 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
13381 and then Comes_From_Source (Typ)
13383 if Is_Immediately_Visible (Scope (Typ)) then
13384 Nam := Make_Selected_Component (Loc,
13386 Make_Identifier (Loc, Chars (Scope (Typ))),
13388 Make_Identifier (Loc, Chars (Typ)));
13390 Nam := Make_Identifier (Loc, Chars (Typ));
13394 Make_Qualified_Expression (Loc,
13395 Subtype_Mark => Nam,
13396 Expression => Relocate_Node (N));
13400 Save_Global_Descendant (Field1 (N));
13401 Save_Global_Descendant (Field2 (N));
13402 Save_Global_Descendant (Field3 (N));
13403 Save_Global_Descendant (Field5 (N));
13405 if Present (Qual) then
13409 -- All other cases than aggregates
13412 Save_Global_Descendant (Field1 (N));
13413 Save_Global_Descendant (Field2 (N));
13414 Save_Global_Descendant (Field3 (N));
13415 Save_Global_Descendant (Field4 (N));
13416 Save_Global_Descendant (Field5 (N));
13421 -- If a node has aspects, references within their expressions must
13422 -- be saved separately, given that they are not directly in the
13425 if Has_Aspects (N) then
13429 Aspect := First (Aspect_Specifications (N));
13430 while Present (Aspect) loop
13431 Save_Global_References (Expression (Aspect));
13436 end Save_References;
13438 -- Start of processing for Save_Global_References
13441 Gen_Scope := Current_Scope;
13443 -- If the generic unit is a child unit, references to entities in the
13444 -- parent are treated as local, because they will be resolved anew in
13445 -- the context of the instance of the parent.
13447 while Is_Child_Unit (Gen_Scope)
13448 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
13450 Gen_Scope := Scope (Gen_Scope);
13453 Save_References (N);
13454 end Save_Global_References;
13456 --------------------------------------
13457 -- Set_Copied_Sloc_For_Inlined_Body --
13458 --------------------------------------
13460 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
13462 Create_Instantiation_Source (N, E, True, S_Adjustment);
13463 end Set_Copied_Sloc_For_Inlined_Body;
13465 ---------------------
13466 -- Set_Instance_Of --
13467 ---------------------
13469 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
13471 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
13472 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
13473 Generic_Renamings.Increment_Last;
13474 end Set_Instance_Of;
13476 --------------------
13477 -- Set_Next_Assoc --
13478 --------------------
13480 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
13482 Generic_Renamings.Table (E).Next_In_HTable := Next;
13483 end Set_Next_Assoc;
13485 -------------------
13486 -- Start_Generic --
13487 -------------------
13489 procedure Start_Generic is
13491 -- ??? More things could be factored out in this routine.
13492 -- Should probably be done at a later stage.
13494 Generic_Flags.Append (Inside_A_Generic);
13495 Inside_A_Generic := True;
13497 Expander_Mode_Save_And_Set (False);
13500 ----------------------
13501 -- Set_Instance_Env --
13502 ----------------------
13504 procedure Set_Instance_Env
13505 (Gen_Unit : Entity_Id;
13506 Act_Unit : Entity_Id)
13509 -- Regardless of the current mode, predefined units are analyzed in the
13510 -- most current Ada mode, and earlier version Ada checks do not apply
13511 -- to predefined units. Nothing needs to be done for non-internal units.
13512 -- These are always analyzed in the current mode.
13514 if Is_Internal_File_Name
13515 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
13516 Renamings_Included => True)
13518 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
13521 Current_Instantiated_Parent :=
13522 (Gen_Id => Gen_Unit,
13523 Act_Id => Act_Unit,
13524 Next_In_HTable => Assoc_Null);
13525 end Set_Instance_Env;
13531 procedure Switch_View (T : Entity_Id) is
13532 BT : constant Entity_Id := Base_Type (T);
13533 Priv_Elmt : Elmt_Id := No_Elmt;
13534 Priv_Sub : Entity_Id;
13537 -- T may be private but its base type may have been exchanged through
13538 -- some other occurrence, in which case there is nothing to switch
13539 -- besides T itself. Note that a private dependent subtype of a private
13540 -- type might not have been switched even if the base type has been,
13541 -- because of the last branch of Check_Private_View (see comment there).
13543 if not Is_Private_Type (BT) then
13544 Prepend_Elmt (Full_View (T), Exchanged_Views);
13545 Exchange_Declarations (T);
13549 Priv_Elmt := First_Elmt (Private_Dependents (BT));
13551 if Present (Full_View (BT)) then
13552 Prepend_Elmt (Full_View (BT), Exchanged_Views);
13553 Exchange_Declarations (BT);
13556 while Present (Priv_Elmt) loop
13557 Priv_Sub := (Node (Priv_Elmt));
13559 -- We avoid flipping the subtype if the Etype of its full view is
13560 -- private because this would result in a malformed subtype. This
13561 -- occurs when the Etype of the subtype full view is the full view of
13562 -- the base type (and since the base types were just switched, the
13563 -- subtype is pointing to the wrong view). This is currently the case
13564 -- for tagged record types, access types (maybe more?) and needs to
13565 -- be resolved. ???
13567 if Present (Full_View (Priv_Sub))
13568 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
13570 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
13571 Exchange_Declarations (Priv_Sub);
13574 Next_Elmt (Priv_Elmt);
13582 function True_Parent (N : Node_Id) return Node_Id is
13584 if Nkind (Parent (N)) = N_Subunit then
13585 return Parent (Corresponding_Stub (Parent (N)));
13591 -----------------------------
13592 -- Valid_Default_Attribute --
13593 -----------------------------
13595 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
13596 Attr_Id : constant Attribute_Id :=
13597 Get_Attribute_Id (Attribute_Name (Def));
13598 T : constant Entity_Id := Entity (Prefix (Def));
13599 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
13612 F := First_Formal (Nam);
13613 while Present (F) loop
13614 Num_F := Num_F + 1;
13619 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
13620 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
13621 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
13622 Attribute_Unbiased_Rounding =>
13625 and then Is_Floating_Point_Type (T);
13627 when Attribute_Image | Attribute_Pred | Attribute_Succ |
13628 Attribute_Value | Attribute_Wide_Image |
13629 Attribute_Wide_Value =>
13630 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
13632 when Attribute_Max | Attribute_Min =>
13633 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
13635 when Attribute_Input =>
13636 OK := (Is_Fun and then Num_F = 1);
13638 when Attribute_Output | Attribute_Read | Attribute_Write =>
13639 OK := (not Is_Fun and then Num_F = 2);
13646 Error_Msg_N ("attribute reference has wrong profile for subprogram",
13649 end Valid_Default_Attribute;