1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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 Atree; use Atree;
27 with Einfo; use Einfo;
28 with Elists; use Elists;
29 with Errout; use Errout;
30 with Expander; use Expander;
31 with Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Freeze; use Freeze;
36 with Lib.Load; use Lib.Load;
37 with Lib.Xref; use Lib.Xref;
38 with Nlists; use Nlists;
39 with Namet; use Namet;
40 with Nmake; use Nmake;
42 with Rident; use Rident;
43 with Restrict; use Restrict;
44 with Rtsfind; use Rtsfind;
46 with Sem_Cat; use Sem_Cat;
47 with Sem_Ch3; use Sem_Ch3;
48 with Sem_Ch6; use Sem_Ch6;
49 with Sem_Ch7; use Sem_Ch7;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Ch10; use Sem_Ch10;
52 with Sem_Ch13; use Sem_Ch13;
53 with Sem_Disp; use Sem_Disp;
54 with Sem_Elab; use Sem_Elab;
55 with Sem_Elim; use Sem_Elim;
56 with Sem_Eval; use Sem_Eval;
57 with Sem_Res; use Sem_Res;
58 with Sem_Type; use Sem_Type;
59 with Sem_Util; use Sem_Util;
60 with Sem_Warn; use Sem_Warn;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 ----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to share
83 -- generic instantiations (for now). Analysis of a generic definition does
84 -- not perform any expansion action, but the expander must be called on the
85 -- tree for each instantiation, because the expansion may of course depend
86 -- on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is static
224 -- error which must be detected at compile time. The detection of these
225 -- circularities is carried out at the point that we insert a generic
226 -- instance spec or body. If there is a circularity, then the analysis of
227 -- the offending spec or body will eventually result in trying to load the
228 -- same unit again, and we detect this problem as we analyze the package
229 -- instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we get
232 -- into trouble if we try to keep going. The following flag is set if a
233 -- circularity is detected, and used to abandon compilation after the
234 -- messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -------------------------------------------------
241 -- Formal packages and partial parametrization --
242 -------------------------------------------------
244 -- When compiling a generic, a formal package is a local instantiation. If
245 -- declared with a box, its generic formals are visible in the enclosing
246 -- generic. If declared with a partial list of actuals, those actuals that
247 -- are defaulted (covered by an Others clause, or given an explicit box
248 -- initialization) are also visible in the enclosing generic, while those
249 -- that have a corresponding actual are not.
251 -- In our source model of instantiation, the same visibility must be
252 -- present in the spec and body of an instance: the names of the formals
253 -- that are defaulted must be made visible within the instance, and made
254 -- invisible (hidden) after the instantiation is complete, so that they
255 -- are not accessible outside of the instance.
257 -- In a generic, a formal package is treated like a special instantiation.
258 -- Our Ada95 compiler handled formals with and without box in different
259 -- ways. With partial parametrization, we use a single model for both.
260 -- We create a package declaration that consists of the specification of
261 -- the generic package, and a set of declarations that map the actuals
262 -- into local renamings, just as we do for bona fide instantiations. For
263 -- defaulted parameters and formals with a box, we copy directly the
264 -- declarations of the formal into this local package. The result is a
265 -- a package whose visible declarations may include generic formals. This
266 -- package is only used for type checking and visibility analysis, and
267 -- never reaches the back-end, so it can freely violate the placement
268 -- rules for generic formal declarations.
270 -- The list of declarations (renamings and copies of formals) is built
271 -- by Analyze_Associations, just as for regular instantiations.
273 -- At the point of instantiation, conformance checking must be applied only
274 -- to those parameters that were specified in the formal. We perform this
275 -- checking by creating another internal instantiation, this one including
276 -- only the renamings and the formals (the rest of the package spec is not
277 -- relevant to conformance checking). We can then traverse two lists: the
278 -- list of actuals in the instance that corresponds to the formal package,
279 -- and the list of actuals produced for this bogus instantiation. We apply
280 -- the conformance rules to those actuals that are not defaulted (i.e.
281 -- which still appear as generic formals.
283 -- When we compile an instance body we must make the right parameters
284 -- visible again. The predicate Is_Generic_Formal indicates which of the
285 -- formals should have its Is_Hidden flag reset.
287 -----------------------
288 -- Local subprograms --
289 -----------------------
291 procedure Abandon_Instantiation (N : Node_Id);
292 pragma No_Return (Abandon_Instantiation);
293 -- Posts an error message "instantiation abandoned" at the indicated node
294 -- and then raises the exception Instantiation_Error to do it.
296 procedure Analyze_Formal_Array_Type
297 (T : in out Entity_Id;
299 -- A formal array type is treated like an array type declaration, and
300 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
301 -- in-out, because in the case of an anonymous type the entity is
302 -- actually created in the procedure.
304 -- The following procedures treat other kinds of formal parameters
306 procedure Analyze_Formal_Derived_Interface_Type
311 procedure Analyze_Formal_Derived_Type
316 procedure Analyze_Formal_Interface_Type
321 -- The following subprograms create abbreviated declarations for formal
322 -- scalar types. We introduce an anonymous base of the proper class for
323 -- each of them, and define the formals as constrained first subtypes of
324 -- their bases. The bounds are expressions that are non-static in the
327 procedure Analyze_Formal_Decimal_Fixed_Point_Type
328 (T : Entity_Id; Def : Node_Id);
329 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
330 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
331 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
332 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
333 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
334 (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Private_Type
340 -- Creates a new private type, which does not require completion
342 procedure Analyze_Generic_Formal_Part (N : Node_Id);
344 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
345 -- Create a new access type with the given designated type
347 function Analyze_Associations
350 F_Copy : List_Id) return List_Id;
351 -- At instantiation time, build the list of associations between formals
352 -- and actuals. Each association becomes a renaming declaration for the
353 -- formal entity. F_Copy is the analyzed list of formals in the generic
354 -- copy. It is used to apply legality checks to the actuals. I_Node is the
355 -- instantiation node itself.
357 procedure Analyze_Subprogram_Instantiation
361 procedure Build_Instance_Compilation_Unit_Nodes
365 -- This procedure is used in the case where the generic instance of a
366 -- subprogram body or package body is a library unit. In this case, the
367 -- original library unit node for the generic instantiation must be
368 -- replaced by the resulting generic body, and a link made to a new
369 -- compilation unit node for the generic declaration. The argument N is
370 -- the original generic instantiation. Act_Body and Act_Decl are the body
371 -- and declaration of the instance (either package body and declaration
372 -- nodes or subprogram body and declaration nodes depending on the case).
373 -- On return, the node N has been rewritten with the actual body.
375 procedure Check_Access_Definition (N : Node_Id);
376 -- Subsidiary routine to null exclusion processing. Perform an assertion
377 -- check on Ada version and the presence of an access definition in N.
379 procedure Check_Formal_Packages (P_Id : Entity_Id);
380 -- Apply the following to all formal packages in generic associations
382 procedure Check_Formal_Package_Instance
383 (Formal_Pack : Entity_Id;
384 Actual_Pack : Entity_Id);
385 -- Verify that the actuals of the actual instance match the actuals of
386 -- the template for a formal package that is not declared with a box.
388 procedure Check_Forward_Instantiation (Decl : Node_Id);
389 -- If the generic is a local entity and the corresponding body has not
390 -- been seen yet, flag enclosing packages to indicate that it will be
391 -- elaborated after the generic body. Subprograms declared in the same
392 -- package cannot be inlined by the front-end because front-end inlining
393 -- requires a strict linear order of elaboration.
395 procedure Check_Hidden_Child_Unit
397 Gen_Unit : Entity_Id;
398 Act_Decl_Id : Entity_Id);
399 -- If the generic unit is an implicit child instance within a parent
400 -- instance, we need to make an explicit test that it is not hidden by
401 -- a child instance of the same name and parent.
403 procedure Check_Generic_Actuals
404 (Instance : Entity_Id;
405 Is_Formal_Box : Boolean);
406 -- Similar to previous one. Check the actuals in the instantiation,
407 -- whose views can change between the point of instantiation and the point
408 -- of instantiation of the body. In addition, mark the generic renamings
409 -- as generic actuals, so that they are not compatible with other actuals.
410 -- Recurse on an actual that is a formal package whose declaration has
413 function Contains_Instance_Of
416 N : Node_Id) return Boolean;
417 -- Inner is instantiated within the generic Outer. Check whether Inner
418 -- directly or indirectly contains an instance of Outer or of one of its
419 -- parents, in the case of a subunit. Each generic unit holds a list of
420 -- the entities instantiated within (at any depth). This procedure
421 -- determines whether the set of such lists contains a cycle, i.e. an
422 -- illegal circular instantiation.
424 function Denotes_Formal_Package
426 On_Exit : Boolean := False) return Boolean;
427 -- Returns True if E is a formal package of an enclosing generic, or
428 -- the actual for such a formal in an enclosing instantiation. If such
429 -- a package is used as a formal in an nested generic, or as an actual
430 -- in a nested instantiation, the visibility of ITS formals should not
431 -- be modified. When called from within Restore_Private_Views, the flag
432 -- On_Exit is true, to indicate that the search for a possible enclosing
433 -- instance should ignore the current one.
435 function Find_Actual_Type
437 Gen_Type : Entity_Id) return Entity_Id;
438 -- When validating the actual types of a child instance, check whether
439 -- the formal is a formal type of the parent unit, and retrieve the current
440 -- actual for it. Typ is the entity in the analyzed formal type declaration
441 -- (component or index type of an array type, or designated type of an
442 -- access formal) and Gen_Type is the enclosing analyzed formal array
443 -- or access type. The desired actual may be a formal of a parent, or may
444 -- be declared in a formal package of a parent. In both cases it is a
445 -- generic actual type because it appears within a visible instance.
446 -- Finally, it may be declared in a parent unit without being a formal
447 -- of that unit, in which case it must be retrieved by visibility.
448 -- Ambiguities may still arise if two homonyms are declared in two formal
449 -- packages, and the prefix of the formal type may be needed to resolve
450 -- the ambiguity in the instance ???
452 function In_Same_Declarative_Part
454 Inst : Node_Id) return Boolean;
455 -- True if the instantiation Inst and the given freeze_node F_Node appear
456 -- within the same declarative part, ignoring subunits, but with no inter-
457 -- vening suprograms or concurrent units. If true, the freeze node
458 -- of the instance can be placed after the freeze node of the parent,
459 -- which it itself an instance.
461 function In_Main_Context (E : Entity_Id) return Boolean;
462 -- Check whether an instantiation is in the context of the main unit.
463 -- Used to determine whether its body should be elaborated to allow
464 -- front-end inlining.
466 function Is_Generic_Formal (E : Entity_Id) return Boolean;
467 -- Utility to determine whether a given entity is declared by means of
468 -- of a formal parameter declaration. Used to set properly the visiblity
469 -- of generic formals of a generic package declared with a box or with
470 -- partial parametrization.
472 procedure Set_Instance_Env
473 (Gen_Unit : Entity_Id;
474 Act_Unit : Entity_Id);
475 -- Save current instance on saved environment, to be used to determine
476 -- the global status of entities in nested instances. Part of Save_Env.
477 -- called after verifying that the generic unit is legal for the instance,
478 -- The procedure also examines whether the generic unit is a predefined
479 -- unit, in order to set configuration switches accordingly. As a result
480 -- the procedure must be called after analyzing and freezing the actuals.
482 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
483 -- Associate analyzed generic parameter with corresponding
484 -- instance. Used for semantic checks at instantiation time.
486 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
487 -- Traverse the Exchanged_Views list to see if a type was private
488 -- and has already been flipped during this phase of instantiation.
490 procedure Hide_Current_Scope;
491 -- When instantiating a generic child unit, the parent context must be
492 -- present, but the instance and all entities that may be generated
493 -- must be inserted in the current scope. We leave the current scope
494 -- on the stack, but make its entities invisible to avoid visibility
495 -- problems. This is reversed at the end of the instantiation. This is
496 -- not done for the instantiation of the bodies, which only require the
497 -- instances of the generic parents to be in scope.
499 procedure Install_Body
504 -- If the instantiation happens textually before the body of the generic,
505 -- the instantiation of the body must be analyzed after the generic body,
506 -- and not at the point of instantiation. Such early instantiations can
507 -- happen if the generic and the instance appear in a package declaration
508 -- because the generic body can only appear in the corresponding package
509 -- body. Early instantiations can also appear if generic, instance and
510 -- body are all in the declarative part of a subprogram or entry. Entities
511 -- of packages that are early instantiations are delayed, and their freeze
512 -- node appears after the generic body.
514 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
515 -- Insert freeze node at the end of the declarative part that includes the
516 -- instance node N. If N is in the visible part of an enclosing package
517 -- declaration, the freeze node has to be inserted at the end of the
518 -- private declarations, if any.
520 procedure Freeze_Subprogram_Body
521 (Inst_Node : Node_Id;
523 Pack_Id : Entity_Id);
524 -- The generic body may appear textually after the instance, including
525 -- in the proper body of a stub, or within a different package instance.
526 -- Given that the instance can only be elaborated after the generic, we
527 -- place freeze_nodes for the instance and/or for packages that may enclose
528 -- the instance and the generic, so that the back-end can establish the
529 -- proper order of elaboration.
532 -- Establish environment for subsequent instantiation. Separated from
533 -- Save_Env because data-structures for visibility handling must be
534 -- initialized before call to Check_Generic_Child_Unit.
536 procedure Install_Formal_Packages (Par : Entity_Id);
537 -- If any of the formals of the parent are formal packages with box,
538 -- their formal parts are visible in the parent and thus in the child
539 -- unit as well. Analogous to what is done in Check_Generic_Actuals
540 -- for the unit itself. This procedure is also used in an instance, to
541 -- make visible the proper entities of the actual for a formal package
542 -- declared with a box.
544 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
545 -- When compiling an instance of a child unit the parent (which is
546 -- itself an instance) is an enclosing scope that must be made
547 -- immediately visible. This procedure is also used to install the non-
548 -- generic parent of a generic child unit when compiling its body, so
549 -- that full views of types in the parent are made visible.
551 procedure Remove_Parent (In_Body : Boolean := False);
552 -- Reverse effect after instantiation of child is complete
554 procedure Inline_Instance_Body
556 Gen_Unit : Entity_Id;
558 -- If front-end inlining is requested, instantiate the package body,
559 -- and preserve the visibility of its compilation unit, to insure
560 -- that successive instantiations succeed.
562 -- The functions Instantiate_XXX perform various legality checks and build
563 -- the declarations for instantiated generic parameters. In all of these
564 -- Formal is the entity in the generic unit, Actual is the entity of
565 -- expression in the generic associations, and Analyzed_Formal is the
566 -- formal in the generic copy, which contains the semantic information to
567 -- be used to validate the actual.
569 function Instantiate_Object
572 Analyzed_Formal : Node_Id) return List_Id;
574 function Instantiate_Type
577 Analyzed_Formal : Node_Id;
578 Actual_Decls : List_Id) return List_Id;
580 function Instantiate_Formal_Subprogram
583 Analyzed_Formal : Node_Id) return Node_Id;
585 function Instantiate_Formal_Package
588 Analyzed_Formal : Node_Id) return List_Id;
589 -- If the formal package is declared with a box, special visibility rules
590 -- apply to its formals: they are in the visible part of the package. This
591 -- is true in the declarative region of the formal package, that is to say
592 -- in the enclosing generic or instantiation. For an instantiation, the
593 -- parameters of the formal package are made visible in an explicit step.
594 -- Furthermore, if the actual has a visible USE clause, these formals must
595 -- be made potentially use-visible as well. On exit from the enclosing
596 -- instantiation, the reverse must be done.
598 -- For a formal package declared without a box, there are conformance rules
599 -- that apply to the actuals in the generic declaration and the actuals of
600 -- the actual package in the enclosing instantiation. The simplest way to
601 -- apply these rules is to repeat the instantiation of the formal package
602 -- in the context of the enclosing instance, and compare the generic
603 -- associations of this instantiation with those of the actual package.
604 -- This internal instantiation only needs to contain the renamings of the
605 -- formals: the visible and private declarations themselves need not be
608 -- In Ada 2005, the formal package may be only partially parametrized. In
609 -- that case the visibility step must make visible those actuals whose
610 -- corresponding formals were given with a box. A final complication
611 -- involves inherited operations from formal derived types, which must be
612 -- visible if the type is.
614 function Is_In_Main_Unit (N : Node_Id) return Boolean;
615 -- Test if given node is in the main unit
617 procedure Load_Parent_Of_Generic
620 Body_Optional : Boolean := False);
621 -- If the generic appears in a separate non-generic library unit, load the
622 -- corresponding body to retrieve the body of the generic. N is the node
623 -- for the generic instantiation, Spec is the generic package declaration.
625 -- Body_Optional is a flag that indicates that the body is being loaded to
626 -- ensure that temporaries are generated consistently when there are other
627 -- instances in the current declarative part that precede the one being
628 -- loaded. In that case a missing body is acceptable.
630 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
631 -- Add the context clause of the unit containing a generic unit to an
632 -- instantiation that is a compilation unit.
634 function Get_Associated_Node (N : Node_Id) return Node_Id;
635 -- In order to propagate semantic information back from the analyzed copy
636 -- to the original generic, we maintain links between selected nodes in the
637 -- generic and their corresponding copies. At the end of generic analysis,
638 -- the routine Save_Global_References traverses the generic tree, examines
639 -- the semantic information, and preserves the links to those nodes that
640 -- contain global information. At instantiation, the information from the
641 -- associated node is placed on the new copy, so that name resolution is
644 -- Three kinds of source nodes have associated nodes:
646 -- a) those that can reference (denote) entities, that is identifiers,
647 -- character literals, expanded_names, operator symbols, operators,
648 -- and attribute reference nodes. These nodes have an Entity field
649 -- and are the set of nodes that are in N_Has_Entity.
651 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
653 -- c) selected components (N_Selected_Component)
655 -- For the first class, the associated node preserves the entity if it is
656 -- global. If the generic contains nested instantiations, the associated
657 -- node itself has been recopied, and a chain of them must be followed.
659 -- For aggregates, the associated node allows retrieval of the type, which
660 -- may otherwise not appear in the generic. The view of this type may be
661 -- different between generic and instantiation, and the full view can be
662 -- installed before the instantiation is analyzed. For aggregates of type
663 -- extensions, the same view exchange may have to be performed for some of
664 -- the ancestor types, if their view is private at the point of
667 -- Nodes that are selected components in the parse tree may be rewritten
668 -- as expanded names after resolution, and must be treated as potential
669 -- entity holders. which is why they also have an Associated_Node.
671 -- Nodes that do not come from source, such as freeze nodes, do not appear
672 -- in the generic tree, and need not have an associated node.
674 -- The associated node is stored in the Associated_Node field. Note that
675 -- this field overlaps Entity, which is fine, because the whole point is
676 -- that we don't need or want the normal Entity field in this situation.
678 procedure Move_Freeze_Nodes
682 -- Freeze nodes can be generated in the analysis of a generic unit, but
683 -- will not be seen by the back-end. It is necessary to move those nodes
684 -- to the enclosing scope if they freeze an outer entity. We place them
685 -- at the end of the enclosing generic package, which is semantically
688 procedure Preanalyze_Actuals (N : Node_Id);
689 -- Analyze actuals to perform name resolution. Full resolution is done
690 -- later, when the expected types are known, but names have to be captured
691 -- before installing parents of generics, that are not visible for the
692 -- actuals themselves.
694 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
695 -- Verify that an attribute that appears as the default for a formal
696 -- subprogram is a function or procedure with the correct profile.
698 -------------------------------------------
699 -- Data Structures for Generic Renamings --
700 -------------------------------------------
702 -- The map Generic_Renamings associates generic entities with their
703 -- corresponding actuals. Currently used to validate type instances. It
704 -- will eventually be used for all generic parameters to eliminate the
705 -- need for overload resolution in the instance.
707 type Assoc_Ptr is new Int;
709 Assoc_Null : constant Assoc_Ptr := -1;
714 Next_In_HTable : Assoc_Ptr;
717 package Generic_Renamings is new Table.Table
718 (Table_Component_Type => Assoc,
719 Table_Index_Type => Assoc_Ptr,
720 Table_Low_Bound => 0,
722 Table_Increment => 100,
723 Table_Name => "Generic_Renamings");
725 -- Variable to hold enclosing instantiation. When the environment is
726 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
728 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
730 -- Hash table for associations
732 HTable_Size : constant := 37;
733 type HTable_Range is range 0 .. HTable_Size - 1;
735 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
736 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
737 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
738 function Hash (F : Entity_Id) return HTable_Range;
740 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
741 Header_Num => HTable_Range,
743 Elmt_Ptr => Assoc_Ptr,
744 Null_Ptr => Assoc_Null,
745 Set_Next => Set_Next_Assoc,
748 Get_Key => Get_Gen_Id,
752 Exchanged_Views : Elist_Id;
753 -- This list holds the private views that have been exchanged during
754 -- instantiation to restore the visibility of the generic declaration.
755 -- (see comments above). After instantiation, the current visibility is
756 -- reestablished by means of a traversal of this list.
758 Hidden_Entities : Elist_Id;
759 -- This list holds the entities of the current scope that are removed
760 -- from immediate visibility when instantiating a child unit. Their
761 -- visibility is restored in Remove_Parent.
763 -- Because instantiations can be recursive, the following must be saved
764 -- on entry and restored on exit from an instantiation (spec or body).
765 -- This is done by the two procedures Save_Env and Restore_Env. For
766 -- package and subprogram instantiations (but not for the body instances)
767 -- the action of Save_Env is done in two steps: Init_Env is called before
768 -- Check_Generic_Child_Unit, because setting the parent instances requires
769 -- that the visibility data structures be properly initialized. Once the
770 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
772 Parent_Unit_Visible : Boolean := False;
773 -- Parent_Unit_Visible is used when the generic is a child unit, and
774 -- indicates whether the ultimate parent of the generic is visible in the
775 -- instantiation environment. It is used to reset the visibility of the
776 -- parent at the end of the instantiation (see Remove_Parent).
778 Instance_Parent_Unit : Entity_Id := Empty;
779 -- This records the ultimate parent unit of an instance of a generic
780 -- child unit and is used in conjunction with Parent_Unit_Visible to
781 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
783 type Instance_Env is record
784 Instantiated_Parent : Assoc;
785 Exchanged_Views : Elist_Id;
786 Hidden_Entities : Elist_Id;
787 Current_Sem_Unit : Unit_Number_Type;
788 Parent_Unit_Visible : Boolean := False;
789 Instance_Parent_Unit : Entity_Id := Empty;
790 Switches : Config_Switches_Type;
793 package Instance_Envs is new Table.Table (
794 Table_Component_Type => Instance_Env,
795 Table_Index_Type => Int,
796 Table_Low_Bound => 0,
798 Table_Increment => 100,
799 Table_Name => "Instance_Envs");
801 procedure Restore_Private_Views
802 (Pack_Id : Entity_Id;
803 Is_Package : Boolean := True);
804 -- Restore the private views of external types, and unmark the generic
805 -- renamings of actuals, so that they become comptible subtypes again.
806 -- For subprograms, Pack_Id is the package constructed to hold the
809 procedure Switch_View (T : Entity_Id);
810 -- Switch the partial and full views of a type and its private
811 -- dependents (i.e. its subtypes and derived types).
813 ------------------------------------
814 -- Structures for Error Reporting --
815 ------------------------------------
817 Instantiation_Node : Node_Id;
818 -- Used by subprograms that validate instantiation of formal parameters
819 -- where there might be no actual on which to place the error message.
820 -- Also used to locate the instantiation node for generic subunits.
822 Instantiation_Error : exception;
823 -- When there is a semantic error in the generic parameter matching,
824 -- there is no point in continuing the instantiation, because the
825 -- number of cascaded errors is unpredictable. This exception aborts
826 -- the instantiation process altogether.
828 S_Adjustment : Sloc_Adjustment;
829 -- Offset created for each node in an instantiation, in order to keep
830 -- track of the source position of the instantiation in each of its nodes.
831 -- A subsequent semantic error or warning on a construct of the instance
832 -- points to both places: the original generic node, and the point of
833 -- instantiation. See Sinput and Sinput.L for additional details.
835 ------------------------------------------------------------
836 -- Data structure for keeping track when inside a Generic --
837 ------------------------------------------------------------
839 -- The following table is used to save values of the Inside_A_Generic
840 -- flag (see spec of Sem) when they are saved by Start_Generic.
842 package Generic_Flags is new Table.Table (
843 Table_Component_Type => Boolean,
844 Table_Index_Type => Int,
845 Table_Low_Bound => 0,
847 Table_Increment => 200,
848 Table_Name => "Generic_Flags");
850 ---------------------------
851 -- Abandon_Instantiation --
852 ---------------------------
854 procedure Abandon_Instantiation (N : Node_Id) is
856 Error_Msg_N ("\instantiation abandoned!", N);
857 raise Instantiation_Error;
858 end Abandon_Instantiation;
860 --------------------------
861 -- Analyze_Associations --
862 --------------------------
864 function Analyze_Associations
867 F_Copy : List_Id) return List_Id
869 Actual_Types : constant Elist_Id := New_Elmt_List;
870 Assoc : constant List_Id := New_List;
871 Default_Actuals : constant Elist_Id := New_Elmt_List;
872 Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy));
876 Next_Formal : Node_Id;
877 Temp_Formal : Node_Id;
878 Analyzed_Formal : Node_Id;
881 First_Named : Node_Id := Empty;
883 Default_Formals : constant List_Id := New_List;
884 -- If an Other_Choice is present, some of the formals may be defaulted.
885 -- To simplify the treatement of visibility in an instance, we introduce
886 -- individual defaults for each such formal. These defaults are
887 -- appended to the list of associations and replace the Others_Choice.
889 Found_Assoc : Node_Id;
890 -- Association for the current formal being match. Empty if there are
891 -- no remaining actuals, or if there is no named association with the
892 -- name of the formal.
894 Is_Named_Assoc : Boolean;
895 Num_Matched : Int := 0;
896 Num_Actuals : Int := 0;
898 Others_Present : Boolean := False;
899 -- In Ada 2005, indicates partial parametrization of of a formal
900 -- package. As usual an others association must be last in the list.
902 function Matching_Actual
904 A_F : Entity_Id) return Node_Id;
905 -- Find actual that corresponds to a given a formal parameter. If the
906 -- actuals are positional, return the next one, if any. If the actuals
907 -- are named, scan the parameter associations to find the right one.
908 -- A_F is the corresponding entity in the analyzed generic,which is
909 -- placed on the selector name for ASIS use.
911 -- In Ada 2005, a named association may be given with a box, in which
912 -- case Matching_Actual sets Found_Assoc to the generic association,
913 -- but return Empty for the actual itself. In this case the code below
914 -- creates a corresponding declaration for the formal.
916 function Partial_Parametrization return Boolean;
917 -- Ada 2005: if no match is found for a given formal, check if the
918 -- association for it includes a box, or whether the associations
919 -- include an Others clause.
921 procedure Process_Default (F : Entity_Id);
922 -- Add a copy of the declaration of generic formal F to the list of
923 -- associations, and add an explicit box association for F if there
924 -- is none yet, and the default comes from an Others_Choice.
926 procedure Set_Analyzed_Formal;
927 -- Find the node in the generic copy that corresponds to a given formal.
928 -- The semantic information on this node is used to perform legality
929 -- checks on the actuals. Because semantic analysis can introduce some
930 -- anonymous entities or modify the declaration node itself, the
931 -- correspondence between the two lists is not one-one. In addition to
932 -- anonymous types, the presence a formal equality will introduce an
933 -- implicit declaration for the corresponding inequality.
935 ---------------------
936 -- Matching_Actual --
937 ---------------------
939 function Matching_Actual
941 A_F : Entity_Id) return Node_Id
947 Is_Named_Assoc := False;
949 -- End of list of purely positional parameters
952 or else Nkind (Actual) = N_Others_Choice
954 Found_Assoc := Empty;
957 -- Case of positional parameter corresponding to current formal
959 elsif No (Selector_Name (Actual)) then
960 Found_Assoc := Actual;
961 Act := Explicit_Generic_Actual_Parameter (Actual);
962 Num_Matched := Num_Matched + 1;
965 -- Otherwise scan list of named actuals to find the one with the
966 -- desired name. All remaining actuals have explicit names.
969 Is_Named_Assoc := True;
970 Found_Assoc := Empty;
974 while Present (Actual) loop
975 if Chars (Selector_Name (Actual)) = Chars (F) then
976 Set_Entity (Selector_Name (Actual), A_F);
977 Set_Etype (Selector_Name (Actual), Etype (A_F));
978 Generate_Reference (A_F, Selector_Name (Actual));
979 Found_Assoc := Actual;
980 Act := Explicit_Generic_Actual_Parameter (Actual);
981 Num_Matched := Num_Matched + 1;
989 -- Reset for subsequent searches. In most cases the named
990 -- associations are in order. If they are not, we reorder them
991 -- to avoid scanning twice the same actual. This is not just a
992 -- question of efficiency: there may be multiple defaults with
993 -- boxes that have the same name. In a nested instantiation we
994 -- insert actuals for those defaults, and cannot rely on their
995 -- names to disambiguate them.
997 if Actual = First_Named then
1000 elsif Present (Actual) then
1001 Insert_Before (First_Named, Remove_Next (Prev));
1004 Actual := First_Named;
1007 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1008 Set_Used_As_Generic_Actual (Entity (Act));
1012 end Matching_Actual;
1014 -----------------------------
1015 -- Partial_Parametrization --
1016 -----------------------------
1018 function Partial_Parametrization return Boolean is
1020 return Others_Present
1021 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1022 end Partial_Parametrization;
1024 ---------------------
1025 -- Process_Default --
1026 ---------------------
1028 procedure Process_Default (F : Entity_Id) is
1029 Loc : constant Source_Ptr := Sloc (I_Node);
1030 F_Id : constant Entity_Id := Defining_Entity (F);
1037 -- Append copy of formal declaration to associations, and create
1038 -- new defining identifier for it.
1040 Decl := New_Copy_Tree (F);
1041 Id := Make_Defining_Identifier (Sloc (F_Id), Chars => Chars (F_Id));
1043 if Nkind (F) in N_Formal_Subprogram_Declaration then
1044 Set_Defining_Unit_Name (Specification (Decl), Id);
1047 Set_Defining_Identifier (Decl, Id);
1050 Append (Decl, Assoc);
1052 if No (Found_Assoc) then
1054 Make_Generic_Association (Loc,
1055 Selector_Name => New_Occurrence_Of (Id, Loc),
1056 Explicit_Generic_Actual_Parameter => Empty);
1057 Set_Box_Present (Default);
1058 Append (Default, Default_Formals);
1060 end Process_Default;
1062 -------------------------
1063 -- Set_Analyzed_Formal --
1064 -------------------------
1066 procedure Set_Analyzed_Formal is
1070 while Present (Analyzed_Formal) loop
1071 Kind := Nkind (Analyzed_Formal);
1073 case Nkind (Formal) is
1075 when N_Formal_Subprogram_Declaration =>
1076 exit when Kind in N_Formal_Subprogram_Declaration
1079 (Defining_Unit_Name (Specification (Formal))) =
1081 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1083 when N_Formal_Package_Declaration =>
1084 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1085 N_Generic_Package_Declaration,
1086 N_Package_Declaration);
1088 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1092 -- Skip freeze nodes, and nodes inserted to replace
1093 -- unrecognized pragmas.
1096 Kind not in N_Formal_Subprogram_Declaration
1097 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1101 and then Chars (Defining_Identifier (Formal)) =
1102 Chars (Defining_Identifier (Analyzed_Formal));
1105 Next (Analyzed_Formal);
1107 end Set_Analyzed_Formal;
1109 -- Start of processing for Analyze_Associations
1112 Actuals := Generic_Associations (I_Node);
1114 if Present (Actuals) then
1116 -- check for an Others choice, indicating a partial parametrization
1117 -- for a formal package.
1119 Actual := First (Actuals);
1120 while Present (Actual) loop
1121 if Nkind (Actual) = N_Others_Choice then
1122 Others_Present := True;
1124 if Present (Next (Actual)) then
1125 Error_Msg_N ("others must be last association", Actual);
1128 -- This subprogram is used both for formal packages and for
1129 -- instantiations. For the latter, associations must all be
1132 if Nkind (I_Node) /= N_Formal_Package_Declaration
1133 and then Comes_From_Source (I_Node)
1136 ("others association not allowed in an instance",
1140 -- In any case, nothing to do after the others association
1144 elsif Box_Present (Actual)
1145 and then Comes_From_Source (I_Node)
1146 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1149 ("box association not allowed in an instance", Actual);
1155 -- If named associations are present, save first named association
1156 -- (it may of course be Empty) to facilitate subsequent name search.
1158 First_Named := First (Actuals);
1159 while Present (First_Named)
1160 and then Nkind (First_Named) /= N_Others_Choice
1161 and then No (Selector_Name (First_Named))
1163 Num_Actuals := Num_Actuals + 1;
1168 Named := First_Named;
1169 while Present (Named) loop
1170 if Nkind (Named) /= N_Others_Choice
1171 and then No (Selector_Name (Named))
1173 Error_Msg_N ("invalid positional actual after named one", Named);
1174 Abandon_Instantiation (Named);
1177 -- A named association may lack an actual parameter, if it was
1178 -- introduced for a default subprogram that turns out to be local
1179 -- to the outer instantiation.
1181 if Nkind (Named) /= N_Others_Choice
1182 and then Present (Explicit_Generic_Actual_Parameter (Named))
1184 Num_Actuals := Num_Actuals + 1;
1190 if Present (Formals) then
1191 Formal := First_Non_Pragma (Formals);
1192 Analyzed_Formal := First_Non_Pragma (F_Copy);
1194 if Present (Actuals) then
1195 Actual := First (Actuals);
1197 -- All formals should have default values
1203 while Present (Formal) loop
1204 Set_Analyzed_Formal;
1205 Next_Formal := Next_Non_Pragma (Formal);
1207 case Nkind (Formal) is
1208 when N_Formal_Object_Declaration =>
1211 Defining_Identifier (Formal),
1212 Defining_Identifier (Analyzed_Formal));
1214 if No (Match) and then Partial_Parametrization then
1215 Process_Default (Formal);
1218 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1222 when N_Formal_Type_Declaration =>
1225 Defining_Identifier (Formal),
1226 Defining_Identifier (Analyzed_Formal));
1229 if Partial_Parametrization then
1230 Process_Default (Formal);
1233 Error_Msg_Sloc := Sloc (Gen_Unit);
1237 Defining_Identifier (Formal));
1238 Error_Msg_NE ("\in instantiation of & declared#",
1239 Instantiation_Node, Gen_Unit);
1240 Abandon_Instantiation (Instantiation_Node);
1247 (Formal, Match, Analyzed_Formal, Assoc),
1250 -- An instantiation is a freeze point for the actuals,
1251 -- unless this is a rewritten formal package.
1253 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1254 Append_Elmt (Entity (Match), Actual_Types);
1258 -- A remote access-to-class-wide type must not be an
1259 -- actual parameter for a generic formal of an access
1260 -- type (E.2.2 (17)).
1262 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1264 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1265 N_Access_To_Object_Definition
1267 Validate_Remote_Access_To_Class_Wide_Type (Match);
1270 when N_Formal_Subprogram_Declaration =>
1273 Defining_Unit_Name (Specification (Formal)),
1274 Defining_Unit_Name (Specification (Analyzed_Formal)));
1276 -- If the formal subprogram has the same name as
1277 -- another formal subprogram of the generic, then
1278 -- a named association is illegal (12.3(9)). Exclude
1279 -- named associations that are generated for a nested
1283 and then Is_Named_Assoc
1284 and then Comes_From_Source (Found_Assoc)
1286 Temp_Formal := First (Formals);
1287 while Present (Temp_Formal) loop
1288 if Nkind (Temp_Formal) in
1289 N_Formal_Subprogram_Declaration
1290 and then Temp_Formal /= Formal
1292 Chars (Selector_Name (Found_Assoc)) =
1293 Chars (Defining_Unit_Name
1294 (Specification (Temp_Formal)))
1297 ("name not allowed for overloaded formal",
1299 Abandon_Instantiation (Instantiation_Node);
1306 -- If there is no corresponding actual, this may be case of
1307 -- partial parametrization, or else the formal has a default
1311 and then Partial_Parametrization
1313 Process_Default (Formal);
1316 Instantiate_Formal_Subprogram
1317 (Formal, Match, Analyzed_Formal));
1320 -- If this is a nested generic, preserve default for later
1324 and then Box_Present (Formal)
1327 (Defining_Unit_Name (Specification (Last (Assoc))),
1331 when N_Formal_Package_Declaration =>
1334 Defining_Identifier (Formal),
1335 Defining_Identifier (Original_Node (Analyzed_Formal)));
1338 if Partial_Parametrization then
1339 Process_Default (Formal);
1342 Error_Msg_Sloc := Sloc (Gen_Unit);
1345 Instantiation_Node, Defining_Identifier (Formal));
1346 Error_Msg_NE ("\in instantiation of & declared#",
1347 Instantiation_Node, Gen_Unit);
1349 Abandon_Instantiation (Instantiation_Node);
1355 (Instantiate_Formal_Package
1356 (Formal, Match, Analyzed_Formal),
1360 -- For use type and use package appearing in the generic part,
1361 -- we have already copied them, so we can just move them where
1362 -- they belong (we mustn't recopy them since this would mess up
1363 -- the Sloc values).
1365 when N_Use_Package_Clause |
1366 N_Use_Type_Clause =>
1367 if Nkind (Original_Node (I_Node)) =
1368 N_Formal_Package_Declaration
1370 Append (New_Copy_Tree (Formal), Assoc);
1373 Append (Formal, Assoc);
1377 raise Program_Error;
1381 Formal := Next_Formal;
1382 Next_Non_Pragma (Analyzed_Formal);
1385 if Num_Actuals > Num_Matched then
1386 Error_Msg_Sloc := Sloc (Gen_Unit);
1388 if Present (Selector_Name (Actual)) then
1390 ("unmatched actual&",
1391 Actual, Selector_Name (Actual));
1392 Error_Msg_NE ("\in instantiation of& declared#",
1396 ("unmatched actual in instantiation of& declared#",
1401 elsif Present (Actuals) then
1403 ("too many actuals in generic instantiation", Instantiation_Node);
1407 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1410 while Present (Elmt) loop
1411 Freeze_Before (I_Node, Node (Elmt));
1416 -- If there are default subprograms, normalize the tree by adding
1417 -- explicit associations for them. This is required if the instance
1418 -- appears within a generic.
1426 Elmt := First_Elmt (Default_Actuals);
1427 while Present (Elmt) loop
1428 if No (Actuals) then
1429 Actuals := New_List;
1430 Set_Generic_Associations (I_Node, Actuals);
1433 Subp := Node (Elmt);
1435 Make_Generic_Association (Sloc (Subp),
1436 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1437 Explicit_Generic_Actual_Parameter =>
1438 New_Occurrence_Of (Subp, Sloc (Subp)));
1439 Mark_Rewrite_Insertion (New_D);
1440 Append_To (Actuals, New_D);
1445 -- If this is a formal package. normalize the parameter list by adding
1446 -- explicit box asssociations for the formals that are covered by an
1449 if not Is_Empty_List (Default_Formals) then
1450 Append_List (Default_Formals, Formals);
1454 end Analyze_Associations;
1456 -------------------------------
1457 -- Analyze_Formal_Array_Type --
1458 -------------------------------
1460 procedure Analyze_Formal_Array_Type
1461 (T : in out Entity_Id;
1467 -- Treated like a non-generic array declaration, with additional
1472 if Nkind (Def) = N_Constrained_Array_Definition then
1473 DSS := First (Discrete_Subtype_Definitions (Def));
1474 while Present (DSS) loop
1475 if Nkind_In (DSS, N_Subtype_Indication,
1477 N_Attribute_Reference)
1479 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1486 Array_Type_Declaration (T, Def);
1487 Set_Is_Generic_Type (Base_Type (T));
1489 if Ekind (Component_Type (T)) = E_Incomplete_Type
1490 and then No (Full_View (Component_Type (T)))
1492 Error_Msg_N ("premature usage of incomplete type", Def);
1494 -- Check that range constraint is not allowed on the component type
1495 -- of a generic formal array type (AARM 12.5.3(3))
1497 elsif Is_Internal (Component_Type (T))
1498 and then Present (Subtype_Indication (Component_Definition (Def)))
1499 and then Nkind (Original_Node
1500 (Subtype_Indication (Component_Definition (Def)))) =
1501 N_Subtype_Indication
1504 ("in a formal, a subtype indication can only be "
1505 & "a subtype mark (RM 12.5.3(3))",
1506 Subtype_Indication (Component_Definition (Def)));
1509 end Analyze_Formal_Array_Type;
1511 ---------------------------------------------
1512 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1513 ---------------------------------------------
1515 -- As for other generic types, we create a valid type representation with
1516 -- legal but arbitrary attributes, whose values are never considered
1517 -- static. For all scalar types we introduce an anonymous base type, with
1518 -- the same attributes. We choose the corresponding integer type to be
1519 -- Standard_Integer.
1521 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1525 Loc : constant Source_Ptr := Sloc (Def);
1526 Base : constant Entity_Id :=
1528 (E_Decimal_Fixed_Point_Type,
1529 Current_Scope, Sloc (Def), 'G');
1530 Int_Base : constant Entity_Id := Standard_Integer;
1531 Delta_Val : constant Ureal := Ureal_1;
1532 Digs_Val : constant Uint := Uint_6;
1537 Set_Etype (Base, Base);
1538 Set_Size_Info (Base, Int_Base);
1539 Set_RM_Size (Base, RM_Size (Int_Base));
1540 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1541 Set_Digits_Value (Base, Digs_Val);
1542 Set_Delta_Value (Base, Delta_Val);
1543 Set_Small_Value (Base, Delta_Val);
1544 Set_Scalar_Range (Base,
1546 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1547 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1549 Set_Is_Generic_Type (Base);
1550 Set_Parent (Base, Parent (Def));
1552 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1553 Set_Etype (T, Base);
1554 Set_Size_Info (T, Int_Base);
1555 Set_RM_Size (T, RM_Size (Int_Base));
1556 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1557 Set_Digits_Value (T, Digs_Val);
1558 Set_Delta_Value (T, Delta_Val);
1559 Set_Small_Value (T, Delta_Val);
1560 Set_Scalar_Range (T, Scalar_Range (Base));
1561 Set_Is_Constrained (T);
1563 Check_Restriction (No_Fixed_Point, Def);
1564 end Analyze_Formal_Decimal_Fixed_Point_Type;
1566 -------------------------------------------
1567 -- Analyze_Formal_Derived_Interface_Type --
1568 -------------------------------------------
1570 procedure Analyze_Formal_Derived_Interface_Type
1575 Loc : constant Source_Ptr := Sloc (Def);
1578 -- Rewrite as a type declaration of a derived type. This ensures that
1579 -- the interface list and primitive operations are properly captured.
1582 Make_Full_Type_Declaration (Loc,
1583 Defining_Identifier => T,
1584 Type_Definition => Def));
1586 Set_Is_Generic_Type (T);
1587 end Analyze_Formal_Derived_Interface_Type;
1589 ---------------------------------
1590 -- Analyze_Formal_Derived_Type --
1591 ---------------------------------
1593 procedure Analyze_Formal_Derived_Type
1598 Loc : constant Source_Ptr := Sloc (Def);
1599 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1603 Set_Is_Generic_Type (T);
1605 if Private_Present (Def) then
1607 Make_Private_Extension_Declaration (Loc,
1608 Defining_Identifier => T,
1609 Discriminant_Specifications => Discriminant_Specifications (N),
1610 Unknown_Discriminants_Present => Unk_Disc,
1611 Subtype_Indication => Subtype_Mark (Def),
1612 Interface_List => Interface_List (Def));
1614 Set_Abstract_Present (New_N, Abstract_Present (Def));
1615 Set_Limited_Present (New_N, Limited_Present (Def));
1616 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1620 Make_Full_Type_Declaration (Loc,
1621 Defining_Identifier => T,
1622 Discriminant_Specifications =>
1623 Discriminant_Specifications (Parent (T)),
1625 Make_Derived_Type_Definition (Loc,
1626 Subtype_Indication => Subtype_Mark (Def)));
1628 Set_Abstract_Present
1629 (Type_Definition (New_N), Abstract_Present (Def));
1631 (Type_Definition (New_N), Limited_Present (Def));
1638 if not Is_Composite_Type (T) then
1640 ("unknown discriminants not allowed for elementary types", N);
1642 Set_Has_Unknown_Discriminants (T);
1643 Set_Is_Constrained (T, False);
1647 -- If the parent type has a known size, so does the formal, which makes
1648 -- legal representation clauses that involve the formal.
1650 Set_Size_Known_At_Compile_Time
1651 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1652 end Analyze_Formal_Derived_Type;
1654 ----------------------------------
1655 -- Analyze_Formal_Discrete_Type --
1656 ----------------------------------
1658 -- The operations defined for a discrete types are those of an enumeration
1659 -- type. The size is set to an arbitrary value, for use in analyzing the
1662 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1663 Loc : constant Source_Ptr := Sloc (Def);
1667 Base : constant Entity_Id :=
1669 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1672 Set_Ekind (T, E_Enumeration_Subtype);
1673 Set_Etype (T, Base);
1676 Set_Is_Generic_Type (T);
1677 Set_Is_Constrained (T);
1679 -- For semantic analysis, the bounds of the type must be set to some
1680 -- non-static value. The simplest is to create attribute nodes for those
1681 -- bounds, that refer to the type itself. These bounds are never
1682 -- analyzed but serve as place-holders.
1685 Make_Attribute_Reference (Loc,
1686 Attribute_Name => Name_First,
1687 Prefix => New_Reference_To (T, Loc));
1691 Make_Attribute_Reference (Loc,
1692 Attribute_Name => Name_Last,
1693 Prefix => New_Reference_To (T, Loc));
1696 Set_Scalar_Range (T,
1701 Set_Ekind (Base, E_Enumeration_Type);
1702 Set_Etype (Base, Base);
1703 Init_Size (Base, 8);
1704 Init_Alignment (Base);
1705 Set_Is_Generic_Type (Base);
1706 Set_Scalar_Range (Base, Scalar_Range (T));
1707 Set_Parent (Base, Parent (Def));
1708 end Analyze_Formal_Discrete_Type;
1710 ----------------------------------
1711 -- Analyze_Formal_Floating_Type --
1712 ---------------------------------
1714 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1715 Base : constant Entity_Id :=
1717 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1720 -- The various semantic attributes are taken from the predefined type
1721 -- Float, just so that all of them are initialized. Their values are
1722 -- never used because no constant folding or expansion takes place in
1723 -- the generic itself.
1726 Set_Ekind (T, E_Floating_Point_Subtype);
1727 Set_Etype (T, Base);
1728 Set_Size_Info (T, (Standard_Float));
1729 Set_RM_Size (T, RM_Size (Standard_Float));
1730 Set_Digits_Value (T, Digits_Value (Standard_Float));
1731 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1732 Set_Is_Constrained (T);
1734 Set_Is_Generic_Type (Base);
1735 Set_Etype (Base, Base);
1736 Set_Size_Info (Base, (Standard_Float));
1737 Set_RM_Size (Base, RM_Size (Standard_Float));
1738 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1739 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1740 Set_Parent (Base, Parent (Def));
1742 Check_Restriction (No_Floating_Point, Def);
1743 end Analyze_Formal_Floating_Type;
1745 -----------------------------------
1746 -- Analyze_Formal_Interface_Type;--
1747 -----------------------------------
1749 procedure Analyze_Formal_Interface_Type
1754 Loc : constant Source_Ptr := Sloc (N);
1759 Make_Full_Type_Declaration (Loc,
1760 Defining_Identifier => T,
1761 Type_Definition => Def);
1765 Set_Is_Generic_Type (T);
1766 end Analyze_Formal_Interface_Type;
1768 ---------------------------------
1769 -- Analyze_Formal_Modular_Type --
1770 ---------------------------------
1772 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1774 -- Apart from their entity kind, generic modular types are treated like
1775 -- signed integer types, and have the same attributes.
1777 Analyze_Formal_Signed_Integer_Type (T, Def);
1778 Set_Ekind (T, E_Modular_Integer_Subtype);
1779 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1781 end Analyze_Formal_Modular_Type;
1783 ---------------------------------------
1784 -- Analyze_Formal_Object_Declaration --
1785 ---------------------------------------
1787 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1788 E : constant Node_Id := Default_Expression (N);
1789 Id : constant Node_Id := Defining_Identifier (N);
1796 -- Determine the mode of the formal object
1798 if Out_Present (N) then
1799 K := E_Generic_In_Out_Parameter;
1801 if not In_Present (N) then
1802 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1806 K := E_Generic_In_Parameter;
1809 if Present (Subtype_Mark (N)) then
1810 Find_Type (Subtype_Mark (N));
1811 T := Entity (Subtype_Mark (N));
1813 -- Ada 2005 (AI-423): Formal object with an access definition
1816 Check_Access_Definition (N);
1817 T := Access_Definition
1819 N => Access_Definition (N));
1822 if Ekind (T) = E_Incomplete_Type then
1824 Error_Node : Node_Id;
1827 if Present (Subtype_Mark (N)) then
1828 Error_Node := Subtype_Mark (N);
1830 Check_Access_Definition (N);
1831 Error_Node := Access_Definition (N);
1834 Error_Msg_N ("premature usage of incomplete type", Error_Node);
1838 if K = E_Generic_In_Parameter then
1840 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1842 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1844 ("generic formal of mode IN must not be of limited type", N);
1845 Explain_Limited_Type (T, N);
1848 if Is_Abstract_Type (T) then
1850 ("generic formal of mode IN must not be of abstract type", N);
1854 Preanalyze_Spec_Expression (E, T);
1856 if Is_Limited_Type (T) and then not OK_For_Limited_Init (E) then
1858 ("initialization not allowed for limited types", E);
1859 Explain_Limited_Type (T, E);
1866 -- Case of generic IN OUT parameter
1869 -- If the formal has an unconstrained type, construct its actual
1870 -- subtype, as is done for subprogram formals. In this fashion, all
1871 -- its uses can refer to specific bounds.
1876 if (Is_Array_Type (T)
1877 and then not Is_Constrained (T))
1879 (Ekind (T) = E_Record_Type
1880 and then Has_Discriminants (T))
1883 Non_Freezing_Ref : constant Node_Id :=
1884 New_Reference_To (Id, Sloc (Id));
1888 -- Make sure the actual subtype doesn't generate bogus freezing
1890 Set_Must_Not_Freeze (Non_Freezing_Ref);
1891 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1892 Insert_Before_And_Analyze (N, Decl);
1893 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1896 Set_Actual_Subtype (Id, T);
1901 ("initialization not allowed for `IN OUT` formals", N);
1905 end Analyze_Formal_Object_Declaration;
1907 ----------------------------------------------
1908 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1909 ----------------------------------------------
1911 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1915 Loc : constant Source_Ptr := Sloc (Def);
1916 Base : constant Entity_Id :=
1918 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1920 -- The semantic attributes are set for completeness only, their values
1921 -- will never be used, since all properties of the type are non-static.
1924 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1925 Set_Etype (T, Base);
1926 Set_Size_Info (T, Standard_Integer);
1927 Set_RM_Size (T, RM_Size (Standard_Integer));
1928 Set_Small_Value (T, Ureal_1);
1929 Set_Delta_Value (T, Ureal_1);
1930 Set_Scalar_Range (T,
1932 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1933 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1934 Set_Is_Constrained (T);
1936 Set_Is_Generic_Type (Base);
1937 Set_Etype (Base, Base);
1938 Set_Size_Info (Base, Standard_Integer);
1939 Set_RM_Size (Base, RM_Size (Standard_Integer));
1940 Set_Small_Value (Base, Ureal_1);
1941 Set_Delta_Value (Base, Ureal_1);
1942 Set_Scalar_Range (Base, Scalar_Range (T));
1943 Set_Parent (Base, Parent (Def));
1945 Check_Restriction (No_Fixed_Point, Def);
1946 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1948 ----------------------------
1949 -- Analyze_Formal_Package --
1950 ----------------------------
1952 procedure Analyze_Formal_Package (N : Node_Id) is
1953 Loc : constant Source_Ptr := Sloc (N);
1954 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1956 Gen_Id : constant Node_Id := Name (N);
1958 Gen_Unit : Entity_Id;
1960 Parent_Installed : Boolean := False;
1962 Parent_Instance : Entity_Id;
1963 Renaming_In_Par : Entity_Id;
1964 No_Associations : Boolean := False;
1966 function Build_Local_Package return Node_Id;
1967 -- The formal package is rewritten so that its parameters are replaced
1968 -- with corresponding declarations. For parameters with bona fide
1969 -- associations these declarations are created by Analyze_Associations
1970 -- as for aa regular instantiation. For boxed parameters, we preserve
1971 -- the formal declarations and analyze them, in order to introduce
1972 -- entities of the right kind in the environment of the formal.
1974 -------------------------
1975 -- Build_Local_Package --
1976 -------------------------
1978 function Build_Local_Package return Node_Id is
1980 Pack_Decl : Node_Id;
1983 -- Within the formal, the name of the generic package is a renaming
1984 -- of the formal (as for a regular instantiation).
1987 Make_Package_Declaration (Loc,
1990 (Specification (Original_Node (Gen_Decl)),
1991 Empty, Instantiating => True));
1993 Renaming := Make_Package_Renaming_Declaration (Loc,
1994 Defining_Unit_Name =>
1995 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1996 Name => New_Occurrence_Of (Formal, Loc));
1998 if Nkind (Gen_Id) = N_Identifier
1999 and then Chars (Gen_Id) = Chars (Pack_Id)
2002 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2005 -- If the formal is declared with a box, or with an others choice,
2006 -- create corresponding declarations for all entities in the formal
2007 -- part, so that names with the proper types are available in the
2008 -- specification of the formal package.
2009 -- On the other hand, if there are no associations, then all the
2010 -- formals must have defaults, and this will be checked by the
2011 -- call to Analyze_Associations.
2014 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2017 Formal_Decl : Node_Id;
2020 -- TBA : for a formal package, need to recurse ???
2025 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2026 while Present (Formal_Decl) loop
2028 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2033 -- If generic associations are present, use Analyze_Associations to
2034 -- create the proper renaming declarations.
2038 Act_Tree : constant Node_Id :=
2040 (Original_Node (Gen_Decl), Empty,
2041 Instantiating => True);
2044 Generic_Renamings.Set_Last (0);
2045 Generic_Renamings_HTable.Reset;
2046 Instantiation_Node := N;
2049 Analyze_Associations
2051 Generic_Formal_Declarations (Act_Tree),
2052 Generic_Formal_Declarations (Gen_Decl));
2056 Append (Renaming, To => Decls);
2058 -- Add generated declarations ahead of local declarations in
2061 if No (Visible_Declarations (Specification (Pack_Decl))) then
2062 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2065 (First (Visible_Declarations (Specification (Pack_Decl))),
2070 end Build_Local_Package;
2072 -- Start of processing for Analyze_Formal_Package
2075 Text_IO_Kludge (Gen_Id);
2078 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2079 Gen_Unit := Entity (Gen_Id);
2081 -- Check for a formal package that is a package renaming
2083 if Present (Renamed_Object (Gen_Unit)) then
2084 Gen_Unit := Renamed_Object (Gen_Unit);
2087 if Ekind (Gen_Unit) /= E_Generic_Package then
2088 Error_Msg_N ("expect generic package name", Gen_Id);
2092 elsif Gen_Unit = Current_Scope then
2094 ("generic package cannot be used as a formal package of itself",
2099 elsif In_Open_Scopes (Gen_Unit) then
2100 if Is_Compilation_Unit (Gen_Unit)
2101 and then Is_Child_Unit (Current_Scope)
2103 -- Special-case the error when the formal is a parent, and
2104 -- continue analysis to minimize cascaded errors.
2107 ("generic parent cannot be used as formal package "
2108 & "of a child unit",
2113 ("generic package cannot be used as a formal package "
2122 or else No (Generic_Associations (N))
2123 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2125 No_Associations := True;
2128 -- If there are no generic associations, the generic parameters appear
2129 -- as local entities and are instantiated like them. We copy the generic
2130 -- package declaration as if it were an instantiation, and analyze it
2131 -- like a regular package, except that we treat the formals as
2132 -- additional visible components.
2134 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2136 if In_Extended_Main_Source_Unit (N) then
2137 Set_Is_Instantiated (Gen_Unit);
2138 Generate_Reference (Gen_Unit, N);
2141 Formal := New_Copy (Pack_Id);
2142 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2145 -- Make local generic without formals. The formals will be replaced
2146 -- with internal declarations.
2148 New_N := Build_Local_Package;
2150 -- If there are errors in the parameter list, Analyze_Associations
2151 -- raises Instantiation_Error. Patch the declaration to prevent
2152 -- further exception propagation.
2155 when Instantiation_Error =>
2157 Enter_Name (Formal);
2158 Set_Ekind (Formal, E_Variable);
2159 Set_Etype (Formal, Any_Type);
2161 if Parent_Installed then
2169 Set_Defining_Unit_Name (Specification (New_N), Formal);
2170 Set_Generic_Parent (Specification (N), Gen_Unit);
2171 Set_Instance_Env (Gen_Unit, Formal);
2172 Set_Is_Generic_Instance (Formal);
2174 Enter_Name (Formal);
2175 Set_Ekind (Formal, E_Package);
2176 Set_Etype (Formal, Standard_Void_Type);
2177 Set_Inner_Instances (Formal, New_Elmt_List);
2178 Push_Scope (Formal);
2180 if Is_Child_Unit (Gen_Unit)
2181 and then Parent_Installed
2183 -- Similarly, we have to make the name of the formal visible in the
2184 -- parent instance, to resolve properly fully qualified names that
2185 -- may appear in the generic unit. The parent instance has been
2186 -- placed on the scope stack ahead of the current scope.
2188 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2191 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2192 Set_Ekind (Renaming_In_Par, E_Package);
2193 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2194 Set_Scope (Renaming_In_Par, Parent_Instance);
2195 Set_Parent (Renaming_In_Par, Parent (Formal));
2196 Set_Renamed_Object (Renaming_In_Par, Formal);
2197 Append_Entity (Renaming_In_Par, Parent_Instance);
2200 Analyze (Specification (N));
2202 -- The formals for which associations are provided are not visible
2203 -- outside of the formal package. The others are still declared by a
2204 -- formal parameter declaration.
2206 if not No_Associations then
2211 E := First_Entity (Formal);
2212 while Present (E) loop
2213 exit when Ekind (E) = E_Package
2214 and then Renamed_Entity (E) = Formal;
2216 if not Is_Generic_Formal (E) then
2225 End_Package_Scope (Formal);
2227 if Parent_Installed then
2233 -- Inside the generic unit, the formal package is a regular package, but
2234 -- no body is needed for it. Note that after instantiation, the defining
2235 -- unit name we need is in the new tree and not in the original (see
2236 -- Package_Instantiation). A generic formal package is an instance, and
2237 -- can be used as an actual for an inner instance.
2239 Set_Has_Completion (Formal, True);
2241 -- Add semantic information to the original defining identifier.
2244 Set_Ekind (Pack_Id, E_Package);
2245 Set_Etype (Pack_Id, Standard_Void_Type);
2246 Set_Scope (Pack_Id, Scope (Formal));
2247 Set_Has_Completion (Pack_Id, True);
2248 end Analyze_Formal_Package;
2250 ---------------------------------
2251 -- Analyze_Formal_Private_Type --
2252 ---------------------------------
2254 procedure Analyze_Formal_Private_Type
2260 New_Private_Type (N, T, Def);
2262 -- Set the size to an arbitrary but legal value
2264 Set_Size_Info (T, Standard_Integer);
2265 Set_RM_Size (T, RM_Size (Standard_Integer));
2266 end Analyze_Formal_Private_Type;
2268 ----------------------------------------
2269 -- Analyze_Formal_Signed_Integer_Type --
2270 ----------------------------------------
2272 procedure Analyze_Formal_Signed_Integer_Type
2276 Base : constant Entity_Id :=
2278 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
2283 Set_Ekind (T, E_Signed_Integer_Subtype);
2284 Set_Etype (T, Base);
2285 Set_Size_Info (T, Standard_Integer);
2286 Set_RM_Size (T, RM_Size (Standard_Integer));
2287 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2288 Set_Is_Constrained (T);
2290 Set_Is_Generic_Type (Base);
2291 Set_Size_Info (Base, Standard_Integer);
2292 Set_RM_Size (Base, RM_Size (Standard_Integer));
2293 Set_Etype (Base, Base);
2294 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2295 Set_Parent (Base, Parent (Def));
2296 end Analyze_Formal_Signed_Integer_Type;
2298 -------------------------------
2299 -- Analyze_Formal_Subprogram --
2300 -------------------------------
2302 procedure Analyze_Formal_Subprogram (N : Node_Id) is
2303 Spec : constant Node_Id := Specification (N);
2304 Def : constant Node_Id := Default_Name (N);
2305 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2313 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2314 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2318 Analyze_Subprogram_Declaration (N);
2319 Set_Is_Formal_Subprogram (Nam);
2320 Set_Has_Completion (Nam);
2322 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2323 Set_Is_Abstract_Subprogram (Nam);
2324 Set_Is_Dispatching_Operation (Nam);
2327 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2329 if No (Ctrl_Type) then
2331 ("abstract formal subprogram must have a controlling type",
2334 Check_Controlling_Formals (Ctrl_Type, Nam);
2339 -- Default name is resolved at the point of instantiation
2341 if Box_Present (N) then
2344 -- Else default is bound at the point of generic declaration
2346 elsif Present (Def) then
2347 if Nkind (Def) = N_Operator_Symbol then
2348 Find_Direct_Name (Def);
2350 elsif Nkind (Def) /= N_Attribute_Reference then
2354 -- For an attribute reference, analyze the prefix and verify
2355 -- that it has the proper profile for the subprogram.
2357 Analyze (Prefix (Def));
2358 Valid_Default_Attribute (Nam, Def);
2362 -- Default name may be overloaded, in which case the interpretation
2363 -- with the correct profile must be selected, as for a renaming.
2365 if Etype (Def) = Any_Type then
2368 elsif Nkind (Def) = N_Selected_Component then
2369 Subp := Entity (Selector_Name (Def));
2371 if Ekind (Subp) /= E_Entry then
2372 Error_Msg_N ("expect valid subprogram name as default", Def);
2376 elsif Nkind (Def) = N_Indexed_Component then
2377 if Nkind (Prefix (Def)) /= N_Selected_Component then
2378 Error_Msg_N ("expect valid subprogram name as default", Def);
2382 Subp := Entity (Selector_Name (Prefix (Def)));
2384 if Ekind (Subp) /= E_Entry_Family then
2385 Error_Msg_N ("expect valid subprogram name as default", Def);
2390 elsif Nkind (Def) = N_Character_Literal then
2392 -- Needs some type checks: subprogram should be parameterless???
2394 Resolve (Def, (Etype (Nam)));
2396 elsif not Is_Entity_Name (Def)
2397 or else not Is_Overloadable (Entity (Def))
2399 Error_Msg_N ("expect valid subprogram name as default", Def);
2402 elsif not Is_Overloaded (Def) then
2403 Subp := Entity (Def);
2406 Error_Msg_N ("premature usage of formal subprogram", Def);
2408 elsif not Entity_Matches_Spec (Subp, Nam) then
2409 Error_Msg_N ("no visible entity matches specification", Def);
2415 I1 : Interp_Index := 0;
2421 Get_First_Interp (Def, I, It);
2422 while Present (It.Nam) loop
2424 if Entity_Matches_Spec (It.Nam, Nam) then
2425 if Subp /= Any_Id then
2426 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2428 if It1 = No_Interp then
2429 Error_Msg_N ("ambiguous default subprogram", Def);
2442 Get_Next_Interp (I, It);
2446 if Subp /= Any_Id then
2447 Set_Entity (Def, Subp);
2450 Error_Msg_N ("premature usage of formal subprogram", Def);
2452 elsif Ekind (Subp) /= E_Operator then
2453 Check_Mode_Conformant (Subp, Nam);
2457 Error_Msg_N ("no visible subprogram matches specification", N);
2461 end Analyze_Formal_Subprogram;
2463 -------------------------------------
2464 -- Analyze_Formal_Type_Declaration --
2465 -------------------------------------
2467 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2468 Def : constant Node_Id := Formal_Type_Definition (N);
2472 T := Defining_Identifier (N);
2474 if Present (Discriminant_Specifications (N))
2475 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2478 ("discriminants not allowed for this formal type", T);
2481 -- Enter the new name, and branch to specific routine
2484 when N_Formal_Private_Type_Definition =>
2485 Analyze_Formal_Private_Type (N, T, Def);
2487 when N_Formal_Derived_Type_Definition =>
2488 Analyze_Formal_Derived_Type (N, T, Def);
2490 when N_Formal_Discrete_Type_Definition =>
2491 Analyze_Formal_Discrete_Type (T, Def);
2493 when N_Formal_Signed_Integer_Type_Definition =>
2494 Analyze_Formal_Signed_Integer_Type (T, Def);
2496 when N_Formal_Modular_Type_Definition =>
2497 Analyze_Formal_Modular_Type (T, Def);
2499 when N_Formal_Floating_Point_Definition =>
2500 Analyze_Formal_Floating_Type (T, Def);
2502 when N_Formal_Ordinary_Fixed_Point_Definition =>
2503 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2505 when N_Formal_Decimal_Fixed_Point_Definition =>
2506 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2508 when N_Array_Type_Definition =>
2509 Analyze_Formal_Array_Type (T, Def);
2511 when N_Access_To_Object_Definition |
2512 N_Access_Function_Definition |
2513 N_Access_Procedure_Definition =>
2514 Analyze_Generic_Access_Type (T, Def);
2516 -- Ada 2005: a interface declaration is encoded as an abstract
2517 -- record declaration or a abstract type derivation.
2519 when N_Record_Definition =>
2520 Analyze_Formal_Interface_Type (N, T, Def);
2522 when N_Derived_Type_Definition =>
2523 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2529 raise Program_Error;
2533 Set_Is_Generic_Type (T);
2534 end Analyze_Formal_Type_Declaration;
2536 ------------------------------------
2537 -- Analyze_Function_Instantiation --
2538 ------------------------------------
2540 procedure Analyze_Function_Instantiation (N : Node_Id) is
2542 Analyze_Subprogram_Instantiation (N, E_Function);
2543 end Analyze_Function_Instantiation;
2545 ---------------------------------
2546 -- Analyze_Generic_Access_Type --
2547 ---------------------------------
2549 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2553 if Nkind (Def) = N_Access_To_Object_Definition then
2554 Access_Type_Declaration (T, Def);
2556 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2557 and then No (Full_View (Designated_Type (T)))
2558 and then not Is_Generic_Type (Designated_Type (T))
2560 Error_Msg_N ("premature usage of incomplete type", Def);
2562 elsif Is_Internal (Designated_Type (T)) then
2564 ("only a subtype mark is allowed in a formal", Def);
2568 Access_Subprogram_Declaration (T, Def);
2570 end Analyze_Generic_Access_Type;
2572 ---------------------------------
2573 -- Analyze_Generic_Formal_Part --
2574 ---------------------------------
2576 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2577 Gen_Parm_Decl : Node_Id;
2580 -- The generic formals are processed in the scope of the generic unit,
2581 -- where they are immediately visible. The scope is installed by the
2584 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2586 while Present (Gen_Parm_Decl) loop
2587 Analyze (Gen_Parm_Decl);
2588 Next (Gen_Parm_Decl);
2591 Generate_Reference_To_Generic_Formals (Current_Scope);
2592 end Analyze_Generic_Formal_Part;
2594 ------------------------------------------
2595 -- Analyze_Generic_Package_Declaration --
2596 ------------------------------------------
2598 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2599 Loc : constant Source_Ptr := Sloc (N);
2602 Save_Parent : Node_Id;
2604 Decls : constant List_Id :=
2605 Visible_Declarations (Specification (N));
2609 -- We introduce a renaming of the enclosing package, to have a usable
2610 -- entity as the prefix of an expanded name for a local entity of the
2611 -- form Par.P.Q, where P is the generic package. This is because a local
2612 -- entity named P may hide it, so that the usual visibility rules in
2613 -- the instance will not resolve properly.
2616 Make_Package_Renaming_Declaration (Loc,
2617 Defining_Unit_Name =>
2618 Make_Defining_Identifier (Loc,
2619 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2620 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2622 if Present (Decls) then
2623 Decl := First (Decls);
2624 while Present (Decl)
2625 and then Nkind (Decl) = N_Pragma
2630 if Present (Decl) then
2631 Insert_Before (Decl, Renaming);
2633 Append (Renaming, Visible_Declarations (Specification (N)));
2637 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2640 -- Create copy of generic unit, and save for instantiation. If the unit
2641 -- is a child unit, do not copy the specifications for the parent, which
2642 -- are not part of the generic tree.
2644 Save_Parent := Parent_Spec (N);
2645 Set_Parent_Spec (N, Empty);
2647 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2648 Set_Parent_Spec (New_N, Save_Parent);
2650 Id := Defining_Entity (N);
2651 Generate_Definition (Id);
2653 -- Expansion is not applied to generic units
2658 Set_Ekind (Id, E_Generic_Package);
2659 Set_Etype (Id, Standard_Void_Type);
2661 Enter_Generic_Scope (Id);
2662 Set_Inner_Instances (Id, New_Elmt_List);
2664 Set_Categorization_From_Pragmas (N);
2665 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2667 -- Link the declaration of the generic homonym in the generic copy to
2668 -- the package it renames, so that it is always resolved properly.
2670 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2671 Set_Entity (Associated_Node (Name (Renaming)), Id);
2673 -- For a library unit, we have reconstructed the entity for the unit,
2674 -- and must reset it in the library tables.
2676 if Nkind (Parent (N)) = N_Compilation_Unit then
2677 Set_Cunit_Entity (Current_Sem_Unit, Id);
2680 Analyze_Generic_Formal_Part (N);
2682 -- After processing the generic formals, analysis proceeds as for a
2683 -- non-generic package.
2685 Analyze (Specification (N));
2687 Validate_Categorization_Dependency (N, Id);
2691 End_Package_Scope (Id);
2692 Exit_Generic_Scope (Id);
2694 if Nkind (Parent (N)) /= N_Compilation_Unit then
2695 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2696 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2697 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2700 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2701 Validate_RT_RAT_Component (N);
2703 -- If this is a spec without a body, check that generic parameters
2706 if not Body_Required (Parent (N)) then
2707 Check_References (Id);
2710 end Analyze_Generic_Package_Declaration;
2712 --------------------------------------------
2713 -- Analyze_Generic_Subprogram_Declaration --
2714 --------------------------------------------
2716 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2721 Result_Type : Entity_Id;
2722 Save_Parent : Node_Id;
2725 -- Create copy of generic unit,and save for instantiation. If the unit
2726 -- is a child unit, do not copy the specifications for the parent, which
2727 -- are not part of the generic tree.
2729 Save_Parent := Parent_Spec (N);
2730 Set_Parent_Spec (N, Empty);
2732 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2733 Set_Parent_Spec (New_N, Save_Parent);
2736 Spec := Specification (N);
2737 Id := Defining_Entity (Spec);
2738 Generate_Definition (Id);
2740 if Nkind (Id) = N_Defining_Operator_Symbol then
2742 ("operator symbol not allowed for generic subprogram", Id);
2749 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2751 Enter_Generic_Scope (Id);
2752 Set_Inner_Instances (Id, New_Elmt_List);
2753 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2755 Analyze_Generic_Formal_Part (N);
2757 Formals := Parameter_Specifications (Spec);
2759 if Present (Formals) then
2760 Process_Formals (Formals, Spec);
2763 if Nkind (Spec) = N_Function_Specification then
2764 Set_Ekind (Id, E_Generic_Function);
2766 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
2767 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
2768 Set_Etype (Id, Result_Type);
2770 Find_Type (Result_Definition (Spec));
2771 Set_Etype (Id, Entity (Result_Definition (Spec)));
2775 Set_Ekind (Id, E_Generic_Procedure);
2776 Set_Etype (Id, Standard_Void_Type);
2779 -- For a library unit, we have reconstructed the entity for the unit,
2780 -- and must reset it in the library tables. We also make sure that
2781 -- Body_Required is set properly in the original compilation unit node.
2783 if Nkind (Parent (N)) = N_Compilation_Unit then
2784 Set_Cunit_Entity (Current_Sem_Unit, Id);
2785 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2788 Set_Categorization_From_Pragmas (N);
2789 Validate_Categorization_Dependency (N, Id);
2791 Save_Global_References (Original_Node (N));
2795 Exit_Generic_Scope (Id);
2796 Generate_Reference_To_Formals (Id);
2797 end Analyze_Generic_Subprogram_Declaration;
2799 -----------------------------------
2800 -- Analyze_Package_Instantiation --
2801 -----------------------------------
2803 procedure Analyze_Package_Instantiation (N : Node_Id) is
2804 Loc : constant Source_Ptr := Sloc (N);
2805 Gen_Id : constant Node_Id := Name (N);
2808 Act_Decl_Name : Node_Id;
2809 Act_Decl_Id : Entity_Id;
2814 Gen_Unit : Entity_Id;
2816 Is_Actual_Pack : constant Boolean :=
2817 Is_Internal (Defining_Entity (N));
2819 Env_Installed : Boolean := False;
2820 Parent_Installed : Boolean := False;
2821 Renaming_List : List_Id;
2822 Unit_Renaming : Node_Id;
2823 Needs_Body : Boolean;
2824 Inline_Now : Boolean := False;
2826 procedure Delay_Descriptors (E : Entity_Id);
2827 -- Delay generation of subprogram descriptors for given entity
2829 function Might_Inline_Subp return Boolean;
2830 -- If inlining is active and the generic contains inlined subprograms,
2831 -- we instantiate the body. This may cause superfluous instantiations,
2832 -- but it is simpler than detecting the need for the body at the point
2833 -- of inlining, when the context of the instance is not available.
2835 -----------------------
2836 -- Delay_Descriptors --
2837 -----------------------
2839 procedure Delay_Descriptors (E : Entity_Id) is
2841 if not Delay_Subprogram_Descriptors (E) then
2842 Set_Delay_Subprogram_Descriptors (E);
2843 Pending_Descriptor.Append (E);
2845 end Delay_Descriptors;
2847 -----------------------
2848 -- Might_Inline_Subp --
2849 -----------------------
2851 function Might_Inline_Subp return Boolean is
2855 if not Inline_Processing_Required then
2859 E := First_Entity (Gen_Unit);
2860 while Present (E) loop
2861 if Is_Subprogram (E)
2862 and then Is_Inlined (E)
2872 end Might_Inline_Subp;
2874 -- Start of processing for Analyze_Package_Instantiation
2877 -- Very first thing: apply the special kludge for Text_IO processing
2878 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2880 Text_IO_Kludge (Name (N));
2882 -- Make node global for error reporting
2884 Instantiation_Node := N;
2886 -- Case of instantiation of a generic package
2888 if Nkind (N) = N_Package_Instantiation then
2889 Act_Decl_Id := New_Copy (Defining_Entity (N));
2890 Set_Comes_From_Source (Act_Decl_Id, True);
2892 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2894 Make_Defining_Program_Unit_Name (Loc,
2895 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2896 Defining_Identifier => Act_Decl_Id);
2898 Act_Decl_Name := Act_Decl_Id;
2901 -- Case of instantiation of a formal package
2904 Act_Decl_Id := Defining_Identifier (N);
2905 Act_Decl_Name := Act_Decl_Id;
2908 Generate_Definition (Act_Decl_Id);
2909 Preanalyze_Actuals (N);
2912 Env_Installed := True;
2913 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2914 Gen_Unit := Entity (Gen_Id);
2916 -- Verify that it is the name of a generic package
2918 if Etype (Gen_Unit) = Any_Type then
2922 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2924 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2926 if From_With_Type (Gen_Unit) then
2928 ("cannot instantiate a limited withed package", Gen_Id);
2931 ("expect name of generic package in instantiation", Gen_Id);
2938 if In_Extended_Main_Source_Unit (N) then
2939 Set_Is_Instantiated (Gen_Unit);
2940 Generate_Reference (Gen_Unit, N);
2942 if Present (Renamed_Object (Gen_Unit)) then
2943 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2944 Generate_Reference (Renamed_Object (Gen_Unit), N);
2948 if Nkind (Gen_Id) = N_Identifier
2949 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2952 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2954 elsif Nkind (Gen_Id) = N_Expanded_Name
2955 and then Is_Child_Unit (Gen_Unit)
2956 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2957 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2960 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2963 Set_Entity (Gen_Id, Gen_Unit);
2965 -- If generic is a renaming, get original generic unit
2967 if Present (Renamed_Object (Gen_Unit))
2968 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2970 Gen_Unit := Renamed_Object (Gen_Unit);
2973 -- Verify that there are no circular instantiations
2975 if In_Open_Scopes (Gen_Unit) then
2976 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2980 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2981 Error_Msg_Node_2 := Current_Scope;
2983 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2984 Circularity_Detected := True;
2989 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2991 -- Initialize renamings map, for error checking, and the list that
2992 -- holds private entities whose views have changed between generic
2993 -- definition and instantiation. If this is the instance created to
2994 -- validate an actual package, the instantiation environment is that
2995 -- of the enclosing instance.
2997 Generic_Renamings.Set_Last (0);
2998 Generic_Renamings_HTable.Reset;
3000 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3002 -- Copy original generic tree, to produce text for instantiation
3006 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3008 Act_Spec := Specification (Act_Tree);
3010 -- If this is the instance created to validate an actual package,
3011 -- only the formals matter, do not examine the package spec itself.
3013 if Is_Actual_Pack then
3014 Set_Visible_Declarations (Act_Spec, New_List);
3015 Set_Private_Declarations (Act_Spec, New_List);
3019 Analyze_Associations
3021 Generic_Formal_Declarations (Act_Tree),
3022 Generic_Formal_Declarations (Gen_Decl));
3024 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3025 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3026 Set_Is_Generic_Instance (Act_Decl_Id);
3028 Set_Generic_Parent (Act_Spec, Gen_Unit);
3030 -- References to the generic in its own declaration or its body are
3031 -- references to the instance. Add a renaming declaration for the
3032 -- generic unit itself. This declaration, as well as the renaming
3033 -- declarations for the generic formals, must remain private to the
3034 -- unit: the formals, because this is the language semantics, and
3035 -- the unit because its use is an artifact of the implementation.
3038 Make_Package_Renaming_Declaration (Loc,
3039 Defining_Unit_Name =>
3040 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3041 Name => New_Reference_To (Act_Decl_Id, Loc));
3043 Append (Unit_Renaming, Renaming_List);
3045 -- The renaming declarations are the first local declarations of
3048 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3050 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3052 Set_Visible_Declarations (Act_Spec, Renaming_List);
3056 Make_Package_Declaration (Loc,
3057 Specification => Act_Spec);
3059 -- Save the instantiation node, for subsequent instantiation of the
3060 -- body, if there is one and we are generating code for the current
3061 -- unit. Mark the unit as having a body, to avoid a premature error
3064 -- We instantiate the body if we are generating code, if we are
3065 -- generating cross-reference information, or if we are building
3066 -- trees for ASIS use.
3069 Enclosing_Body_Present : Boolean := False;
3070 -- If the generic unit is not a compilation unit, then a body may
3071 -- be present in its parent even if none is required. We create a
3072 -- tentative pending instantiation for the body, which will be
3073 -- discarded if none is actually present.
3078 if Scope (Gen_Unit) /= Standard_Standard
3079 and then not Is_Child_Unit (Gen_Unit)
3081 Scop := Scope (Gen_Unit);
3083 while Present (Scop)
3084 and then Scop /= Standard_Standard
3086 if Unit_Requires_Body (Scop) then
3087 Enclosing_Body_Present := True;
3090 elsif In_Open_Scopes (Scop)
3091 and then In_Package_Body (Scop)
3093 Enclosing_Body_Present := True;
3097 exit when Is_Compilation_Unit (Scop);
3098 Scop := Scope (Scop);
3102 -- If front-end inlining is enabled, and this is a unit for which
3103 -- code will be generated, we instantiate the body at once.
3105 -- This is done if the instance is not the main unit, and if the
3106 -- generic is not a child unit of another generic, to avoid scope
3107 -- problems and the reinstallation of parent instances.
3110 and then (not Is_Child_Unit (Gen_Unit)
3111 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3112 and then Might_Inline_Subp
3113 and then not Is_Actual_Pack
3115 if Front_End_Inlining
3116 and then (Is_In_Main_Unit (N)
3117 or else In_Main_Context (Current_Scope))
3118 and then Nkind (Parent (N)) /= N_Compilation_Unit
3122 -- In configurable_run_time mode we force the inlining of
3123 -- predefined subprograms marked Inline_Always, to minimize
3124 -- the use of the run-time library.
3126 elsif Is_Predefined_File_Name
3127 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3128 and then Configurable_Run_Time_Mode
3129 and then Nkind (Parent (N)) /= N_Compilation_Unit
3134 -- If the current scope is itself an instance within a child
3135 -- unit, there will be duplications in the scope stack, and the
3136 -- unstacking mechanism in Inline_Instance_Body will fail.
3137 -- This loses some rare cases of optimization, and might be
3138 -- improved some day, if we can find a proper abstraction for
3139 -- "the complete compilation context" that can be saved and
3142 if Is_Generic_Instance (Current_Scope) then
3144 Curr_Unit : constant Entity_Id :=
3145 Cunit_Entity (Current_Sem_Unit);
3147 if Curr_Unit /= Current_Scope
3148 and then Is_Child_Unit (Curr_Unit)
3150 Inline_Now := False;
3157 (Unit_Requires_Body (Gen_Unit)
3158 or else Enclosing_Body_Present
3159 or else Present (Corresponding_Body (Gen_Decl)))
3160 and then (Is_In_Main_Unit (N)
3161 or else Might_Inline_Subp)
3162 and then not Is_Actual_Pack
3163 and then not Inline_Now
3164 and then (Operating_Mode = Generate_Code
3165 or else (Operating_Mode = Check_Semantics
3166 and then ASIS_Mode));
3168 -- If front_end_inlining is enabled, do not instantiate body if
3169 -- within a generic context.
3171 if (Front_End_Inlining
3172 and then not Expander_Active)
3173 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3175 Needs_Body := False;
3178 -- If the current context is generic, and the package being
3179 -- instantiated is declared within a formal package, there is no
3180 -- body to instantiate until the enclosing generic is instantiated
3181 -- and there is an actual for the formal package. If the formal
3182 -- package has parameters, we build a regular package instance for
3183 -- it, that preceeds the original formal package declaration.
3185 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3187 Decl : constant Node_Id :=
3189 (Unit_Declaration_Node (Scope (Gen_Unit)));
3191 if Nkind (Decl) = N_Formal_Package_Declaration
3192 or else (Nkind (Decl) = N_Package_Declaration
3193 and then Is_List_Member (Decl)
3194 and then Present (Next (Decl))
3196 Nkind (Next (Decl)) =
3197 N_Formal_Package_Declaration)
3199 Needs_Body := False;
3205 -- If we are generating the calling stubs from the instantiation of
3206 -- a generic RCI package, we will not use the body of the generic
3209 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3210 and then Is_Compilation_Unit (Defining_Entity (N))
3212 Needs_Body := False;
3217 -- Here is a defence against a ludicrous number of instantiations
3218 -- caused by a circular set of instantiation attempts.
3220 if Pending_Instantiations.Last >
3221 Hostparm.Max_Instantiations
3223 Error_Msg_N ("too many instantiations", N);
3224 raise Unrecoverable_Error;
3227 -- Indicate that the enclosing scopes contain an instantiation,
3228 -- and that cleanup actions should be delayed until after the
3229 -- instance body is expanded.
3231 Check_Forward_Instantiation (Gen_Decl);
3232 if Nkind (N) = N_Package_Instantiation then
3234 Enclosing_Master : Entity_Id;
3237 -- Loop to search enclosing masters
3239 Enclosing_Master := Current_Scope;
3240 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3241 if Ekind (Enclosing_Master) = E_Package then
3242 if Is_Compilation_Unit (Enclosing_Master) then
3243 if In_Package_Body (Enclosing_Master) then
3245 (Body_Entity (Enclosing_Master));
3254 Enclosing_Master := Scope (Enclosing_Master);
3257 elsif Ekind (Enclosing_Master) = E_Generic_Package then
3258 Enclosing_Master := Scope (Enclosing_Master);
3260 elsif Is_Generic_Subprogram (Enclosing_Master)
3261 or else Ekind (Enclosing_Master) = E_Void
3263 -- Cleanup actions will eventually be performed on the
3264 -- enclosing instance, if any. Enclosing scope is void
3265 -- in the formal part of a generic subprogram.
3270 if Ekind (Enclosing_Master) = E_Entry
3272 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3274 if not Expander_Active then
3278 Protected_Body_Subprogram (Enclosing_Master);
3282 Set_Delay_Cleanups (Enclosing_Master);
3284 while Ekind (Enclosing_Master) = E_Block loop
3285 Enclosing_Master := Scope (Enclosing_Master);
3288 if Is_Subprogram (Enclosing_Master) then
3289 Delay_Descriptors (Enclosing_Master);
3291 elsif Is_Task_Type (Enclosing_Master) then
3293 TBP : constant Node_Id :=
3294 Get_Task_Body_Procedure
3297 if Present (TBP) then
3298 Delay_Descriptors (TBP);
3299 Set_Delay_Cleanups (TBP);
3306 end loop Scope_Loop;
3309 -- Make entry in table
3311 Pending_Instantiations.Append
3313 Act_Decl => Act_Decl,
3314 Expander_Status => Expander_Active,
3315 Current_Sem_Unit => Current_Sem_Unit,
3316 Scope_Suppress => Scope_Suppress,
3317 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top));
3321 Set_Categorization_From_Pragmas (Act_Decl);
3323 if Parent_Installed then
3327 Set_Instance_Spec (N, Act_Decl);
3329 -- If not a compilation unit, insert the package declaration before
3330 -- the original instantiation node.
3332 if Nkind (Parent (N)) /= N_Compilation_Unit then
3333 Mark_Rewrite_Insertion (Act_Decl);
3334 Insert_Before (N, Act_Decl);
3337 -- For an instantiation that is a compilation unit, place declaration
3338 -- on current node so context is complete for analysis (including
3339 -- nested instantiations). If this is the main unit, the declaration
3340 -- eventually replaces the instantiation node. If the instance body
3341 -- is later created, it replaces the instance node, and the declation
3342 -- is attached to it (see Build_Instance_Compilation_Unit_Nodes).
3345 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3347 -- The entity for the current unit is the newly created one,
3348 -- and all semantic information is attached to it.
3350 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3352 -- If this is the main unit, replace the main entity as well
3354 if Current_Sem_Unit = Main_Unit then
3355 Main_Unit_Entity := Act_Decl_Id;
3359 Set_Unit (Parent (N), Act_Decl);
3360 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3361 Set_Package_Instantiation (Act_Decl_Id, N);
3363 Set_Unit (Parent (N), N);
3364 Set_Body_Required (Parent (N), False);
3366 -- We never need elaboration checks on instantiations, since by
3367 -- definition, the body instantiation is elaborated at the same
3368 -- time as the spec instantiation.
3370 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3371 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3374 Check_Elab_Instantiation (N);
3376 if ABE_Is_Certain (N) and then Needs_Body then
3377 Pending_Instantiations.Decrement_Last;
3380 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3382 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3383 First_Private_Entity (Act_Decl_Id));
3385 -- If the instantiation will receive a body, the unit will be
3386 -- transformed into a package body, and receive its own elaboration
3387 -- entity. Otherwise, the nature of the unit is now a package
3390 if Nkind (Parent (N)) = N_Compilation_Unit
3391 and then not Needs_Body
3393 Rewrite (N, Act_Decl);
3396 if Present (Corresponding_Body (Gen_Decl))
3397 or else Unit_Requires_Body (Gen_Unit)
3399 Set_Has_Completion (Act_Decl_Id);
3402 Check_Formal_Packages (Act_Decl_Id);
3404 Restore_Private_Views (Act_Decl_Id);
3406 Inherit_Context (Gen_Decl, N);
3408 if Parent_Installed then
3413 Env_Installed := False;
3416 Validate_Categorization_Dependency (N, Act_Decl_Id);
3418 -- Check restriction, but skip this if something went wrong in the above
3419 -- analysis, indicated by Act_Decl_Id being void.
3421 if Ekind (Act_Decl_Id) /= E_Void
3422 and then not Is_Library_Level_Entity (Act_Decl_Id)
3424 Check_Restriction (No_Local_Allocators, N);
3428 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3431 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3432 -- be used as defining identifiers for a formal package and for the
3433 -- corresponding expanded package.
3435 if Nkind (N) = N_Formal_Package_Declaration then
3436 Act_Decl_Id := New_Copy (Defining_Entity (N));
3437 Set_Comes_From_Source (Act_Decl_Id, True);
3438 Set_Is_Generic_Instance (Act_Decl_Id, False);
3439 Set_Defining_Identifier (N, Act_Decl_Id);
3443 when Instantiation_Error =>
3444 if Parent_Installed then
3448 if Env_Installed then
3451 end Analyze_Package_Instantiation;
3453 --------------------------
3454 -- Inline_Instance_Body --
3455 --------------------------
3457 procedure Inline_Instance_Body
3459 Gen_Unit : Entity_Id;
3463 Gen_Comp : constant Entity_Id :=
3464 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3465 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3466 Curr_Scope : Entity_Id := Empty;
3467 Curr_Unit : constant Entity_Id :=
3468 Cunit_Entity (Current_Sem_Unit);
3469 Removed : Boolean := False;
3470 Num_Scopes : Int := 0;
3472 Scope_Stack_Depth : constant Int :=
3473 Scope_Stack.Last - Scope_Stack.First + 1;
3475 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3476 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3477 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3478 Num_Inner : Int := 0;
3479 N_Instances : Int := 0;
3483 -- Case of generic unit defined in another unit. We must remove the
3484 -- complete context of the current unit to install that of the generic.
3486 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3488 -- Add some comments for the following two loops ???
3491 while Present (S) and then S /= Standard_Standard loop
3493 Num_Scopes := Num_Scopes + 1;
3495 Use_Clauses (Num_Scopes) :=
3497 (Scope_Stack.Last - Num_Scopes + 1).
3499 End_Use_Clauses (Use_Clauses (Num_Scopes));
3501 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3502 or else Scope_Stack.Table
3503 (Scope_Stack.Last - Num_Scopes).Entity
3507 exit when Is_Generic_Instance (S)
3508 and then (In_Package_Body (S)
3509 or else Ekind (S) = E_Procedure
3510 or else Ekind (S) = E_Function);
3514 Vis := Is_Immediately_Visible (Gen_Comp);
3516 -- Find and save all enclosing instances
3521 and then S /= Standard_Standard
3523 if Is_Generic_Instance (S) then
3524 N_Instances := N_Instances + 1;
3525 Instances (N_Instances) := S;
3527 exit when In_Package_Body (S);
3533 -- Remove context of current compilation unit, unless we are within a
3534 -- nested package instantiation, in which case the context has been
3535 -- removed previously.
3537 -- If current scope is the body of a child unit, remove context of
3538 -- spec as well. If an enclosing scope is an instance body. the
3539 -- context has already been removed, but the entities in the body
3540 -- must be made invisible as well.
3545 and then S /= Standard_Standard
3547 if Is_Generic_Instance (S)
3548 and then (In_Package_Body (S)
3549 or else Ekind (S) = E_Procedure
3550 or else Ekind (S) = E_Function)
3552 -- We still have to remove the entities of the enclosing
3553 -- instance from direct visibility.
3558 E := First_Entity (S);
3559 while Present (E) loop
3560 Set_Is_Immediately_Visible (E, False);
3569 or else (Ekind (Curr_Unit) = E_Package_Body
3570 and then S = Spec_Entity (Curr_Unit))
3571 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3574 (Unit_Declaration_Node (Curr_Unit)))
3578 -- Remove entities in current scopes from visibility, so that
3579 -- instance body is compiled in a clean environment.
3581 Save_Scope_Stack (Handle_Use => False);
3583 if Is_Child_Unit (S) then
3585 -- Remove child unit from stack, as well as inner scopes.
3586 -- Removing the context of a child unit removes parent units
3589 while Current_Scope /= S loop
3590 Num_Inner := Num_Inner + 1;
3591 Inner_Scopes (Num_Inner) := Current_Scope;
3596 Remove_Context (Curr_Comp);
3600 Remove_Context (Curr_Comp);
3603 if Ekind (Curr_Unit) = E_Package_Body then
3604 Remove_Context (Library_Unit (Curr_Comp));
3610 pragma Assert (Num_Inner < Num_Scopes);
3612 Push_Scope (Standard_Standard);
3613 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3614 Instantiate_Package_Body
3617 Act_Decl => Act_Decl,
3618 Expander_Status => Expander_Active,
3619 Current_Sem_Unit => Current_Sem_Unit,
3620 Scope_Suppress => Scope_Suppress,
3621 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top)),
3622 Inlined_Body => True);
3628 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3630 -- Reset Generic_Instance flag so that use clauses can be installed
3631 -- in the proper order. (See Use_One_Package for effect of enclosing
3632 -- instances on processing of use clauses).
3634 for J in 1 .. N_Instances loop
3635 Set_Is_Generic_Instance (Instances (J), False);
3639 Install_Context (Curr_Comp);
3641 if Present (Curr_Scope)
3642 and then Is_Child_Unit (Curr_Scope)
3644 Push_Scope (Curr_Scope);
3645 Set_Is_Immediately_Visible (Curr_Scope);
3647 -- Finally, restore inner scopes as well
3649 for J in reverse 1 .. Num_Inner loop
3650 Push_Scope (Inner_Scopes (J));
3654 Restore_Scope_Stack (Handle_Use => False);
3656 if Present (Curr_Scope)
3658 (In_Private_Part (Curr_Scope)
3659 or else In_Package_Body (Curr_Scope))
3661 -- Install private declaration of ancestor units, which are
3662 -- currently available. Restore_Scope_Stack and Install_Context
3663 -- only install the visible part of parents.
3668 Par := Scope (Curr_Scope);
3669 while (Present (Par))
3670 and then Par /= Standard_Standard
3672 Install_Private_Declarations (Par);
3679 -- Restore use clauses. For a child unit, use clauses in the parents
3680 -- are restored when installing the context, so only those in inner
3681 -- scopes (and those local to the child unit itself) need to be
3682 -- installed explicitly.
3684 if Is_Child_Unit (Curr_Unit)
3687 for J in reverse 1 .. Num_Inner + 1 loop
3688 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3690 Install_Use_Clauses (Use_Clauses (J));
3694 for J in reverse 1 .. Num_Scopes loop
3695 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3697 Install_Use_Clauses (Use_Clauses (J));
3701 -- Restore status of instances. If one of them is a body, make
3702 -- its local entities visible again.
3709 for J in 1 .. N_Instances loop
3710 Inst := Instances (J);
3711 Set_Is_Generic_Instance (Inst, True);
3713 if In_Package_Body (Inst)
3714 or else Ekind (S) = E_Procedure
3715 or else Ekind (S) = E_Function
3717 E := First_Entity (Instances (J));
3718 while Present (E) loop
3719 Set_Is_Immediately_Visible (E);
3726 -- If generic unit is in current unit, current context is correct
3729 Instantiate_Package_Body
3732 Act_Decl => Act_Decl,
3733 Expander_Status => Expander_Active,
3734 Current_Sem_Unit => Current_Sem_Unit,
3735 Scope_Suppress => Scope_Suppress,
3736 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top)),
3737 Inlined_Body => True);
3739 end Inline_Instance_Body;
3741 -------------------------------------
3742 -- Analyze_Procedure_Instantiation --
3743 -------------------------------------
3745 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3747 Analyze_Subprogram_Instantiation (N, E_Procedure);
3748 end Analyze_Procedure_Instantiation;
3750 --------------------------------------
3751 -- Analyze_Subprogram_Instantiation --
3752 --------------------------------------
3754 procedure Analyze_Subprogram_Instantiation
3758 Loc : constant Source_Ptr := Sloc (N);
3759 Gen_Id : constant Node_Id := Name (N);
3761 Anon_Id : constant Entity_Id :=
3762 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3763 Chars => New_External_Name
3764 (Chars (Defining_Entity (N)), 'R'));
3766 Act_Decl_Id : Entity_Id;
3771 Env_Installed : Boolean := False;
3772 Gen_Unit : Entity_Id;
3774 Pack_Id : Entity_Id;
3775 Parent_Installed : Boolean := False;
3776 Renaming_List : List_Id;
3778 procedure Analyze_Instance_And_Renamings;
3779 -- The instance must be analyzed in a context that includes the mappings
3780 -- of generic parameters into actuals. We create a package declaration
3781 -- for this purpose, and a subprogram with an internal name within the
3782 -- package. The subprogram instance is simply an alias for the internal
3783 -- subprogram, declared in the current scope.
3785 ------------------------------------
3786 -- Analyze_Instance_And_Renamings --
3787 ------------------------------------
3789 procedure Analyze_Instance_And_Renamings is
3790 Def_Ent : constant Entity_Id := Defining_Entity (N);
3791 Pack_Decl : Node_Id;
3794 if Nkind (Parent (N)) = N_Compilation_Unit then
3796 -- For the case of a compilation unit, the container package has
3797 -- the same name as the instantiation, to insure that the binder
3798 -- calls the elaboration procedure with the right name. Copy the
3799 -- entity of the instance, which may have compilation level flags
3800 -- (e.g. Is_Child_Unit) set.
3802 Pack_Id := New_Copy (Def_Ent);
3805 -- Otherwise we use the name of the instantiation concatenated
3806 -- with its source position to ensure uniqueness if there are
3807 -- several instantiations with the same name.
3810 Make_Defining_Identifier (Loc,
3811 Chars => New_External_Name
3812 (Related_Id => Chars (Def_Ent),
3814 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3817 Pack_Decl := Make_Package_Declaration (Loc,
3818 Specification => Make_Package_Specification (Loc,
3819 Defining_Unit_Name => Pack_Id,
3820 Visible_Declarations => Renaming_List,
3821 End_Label => Empty));
3823 Set_Instance_Spec (N, Pack_Decl);
3824 Set_Is_Generic_Instance (Pack_Id);
3825 Set_Debug_Info_Needed (Pack_Id);
3827 -- Case of not a compilation unit
3829 if Nkind (Parent (N)) /= N_Compilation_Unit then
3830 Mark_Rewrite_Insertion (Pack_Decl);
3831 Insert_Before (N, Pack_Decl);
3832 Set_Has_Completion (Pack_Id);
3834 -- Case of an instantiation that is a compilation unit
3836 -- Place declaration on current node so context is complete for
3837 -- analysis (including nested instantiations), and for use in a
3838 -- context_clause (see Analyze_With_Clause).
3841 Set_Unit (Parent (N), Pack_Decl);
3842 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3845 Analyze (Pack_Decl);
3846 Check_Formal_Packages (Pack_Id);
3847 Set_Is_Generic_Instance (Pack_Id, False);
3849 -- Body of the enclosing package is supplied when instantiating the
3850 -- subprogram body, after semantic analysis is completed.
3852 if Nkind (Parent (N)) = N_Compilation_Unit then
3854 -- Remove package itself from visibility, so it does not
3855 -- conflict with subprogram.
3857 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3859 -- Set name and scope of internal subprogram so that the proper
3860 -- external name will be generated. The proper scope is the scope
3861 -- of the wrapper package. We need to generate debugging info for
3862 -- the internal subprogram, so set flag accordingly.
3864 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3865 Set_Scope (Anon_Id, Scope (Pack_Id));
3867 -- Mark wrapper package as referenced, to avoid spurious warnings
3868 -- if the instantiation appears in various with_ clauses of
3869 -- subunits of the main unit.
3871 Set_Referenced (Pack_Id);
3874 Set_Is_Generic_Instance (Anon_Id);
3875 Set_Debug_Info_Needed (Anon_Id);
3876 Act_Decl_Id := New_Copy (Anon_Id);
3878 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3879 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3880 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3881 Set_Comes_From_Source (Act_Decl_Id, True);
3883 -- The signature may involve types that are not frozen yet, but the
3884 -- subprogram will be frozen at the point the wrapper package is
3885 -- frozen, so it does not need its own freeze node. In fact, if one
3886 -- is created, it might conflict with the freezing actions from the
3889 Set_Has_Delayed_Freeze (Anon_Id, False);
3891 -- If the instance is a child unit, mark the Id accordingly. Mark
3892 -- the anonymous entity as well, which is the real subprogram and
3893 -- which is used when the instance appears in a context clause.
3895 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3896 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3897 New_Overloaded_Entity (Act_Decl_Id);
3898 Check_Eliminated (Act_Decl_Id);
3900 -- In compilation unit case, kill elaboration checks on the
3901 -- instantiation, since they are never needed -- the body is
3902 -- instantiated at the same point as the spec.
3904 if Nkind (Parent (N)) = N_Compilation_Unit then
3905 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3906 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3907 Set_Is_Compilation_Unit (Anon_Id);
3909 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3912 -- The instance is not a freezing point for the new subprogram
3914 Set_Is_Frozen (Act_Decl_Id, False);
3916 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3917 Valid_Operator_Definition (Act_Decl_Id);
3920 Set_Alias (Act_Decl_Id, Anon_Id);
3921 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3922 Set_Has_Completion (Act_Decl_Id);
3923 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3925 if Nkind (Parent (N)) = N_Compilation_Unit then
3926 Set_Body_Required (Parent (N), False);
3928 end Analyze_Instance_And_Renamings;
3930 -- Start of processing for Analyze_Subprogram_Instantiation
3933 -- Very first thing: apply the special kludge for Text_IO processing
3934 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3935 -- Of course such an instantiation is bogus (these are packages, not
3936 -- subprograms), but we get a better error message if we do this.
3938 Text_IO_Kludge (Gen_Id);
3940 -- Make node global for error reporting
3942 Instantiation_Node := N;
3943 Preanalyze_Actuals (N);
3946 Env_Installed := True;
3947 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3948 Gen_Unit := Entity (Gen_Id);
3950 Generate_Reference (Gen_Unit, Gen_Id);
3952 if Nkind (Gen_Id) = N_Identifier
3953 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3956 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3959 if Etype (Gen_Unit) = Any_Type then
3964 -- Verify that it is a generic subprogram of the right kind, and that
3965 -- it does not lead to a circular instantiation.
3967 if Ekind (Gen_Unit) /= E_Generic_Procedure
3968 and then Ekind (Gen_Unit) /= E_Generic_Function
3970 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3972 elsif In_Open_Scopes (Gen_Unit) then
3973 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3975 elsif K = E_Procedure
3976 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3978 if Ekind (Gen_Unit) = E_Generic_Function then
3980 ("cannot instantiate generic function as procedure", Gen_Id);
3983 ("expect name of generic procedure in instantiation", Gen_Id);
3986 elsif K = E_Function
3987 and then Ekind (Gen_Unit) /= E_Generic_Function
3989 if Ekind (Gen_Unit) = E_Generic_Procedure then
3991 ("cannot instantiate generic procedure as function", Gen_Id);
3994 ("expect name of generic function in instantiation", Gen_Id);
3998 Set_Entity (Gen_Id, Gen_Unit);
3999 Set_Is_Instantiated (Gen_Unit);
4001 if In_Extended_Main_Source_Unit (N) then
4002 Generate_Reference (Gen_Unit, N);
4005 -- If renaming, get original unit
4007 if Present (Renamed_Object (Gen_Unit))
4008 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4010 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4012 Gen_Unit := Renamed_Object (Gen_Unit);
4013 Set_Is_Instantiated (Gen_Unit);
4014 Generate_Reference (Gen_Unit, N);
4017 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4018 Error_Msg_Node_2 := Current_Scope;
4020 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4021 Circularity_Detected := True;
4025 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4027 -- Initialize renamings map, for error checking
4029 Generic_Renamings.Set_Last (0);
4030 Generic_Renamings_HTable.Reset;
4032 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4034 -- Copy original generic tree, to produce text for instantiation
4035 -- Inherit overriding indicator from instance node.
4039 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4041 Act_Spec := Specification (Act_Tree);
4042 Set_Must_Override (Act_Spec, Must_Override (N));
4043 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4046 Analyze_Associations
4048 Generic_Formal_Declarations (Act_Tree),
4049 Generic_Formal_Declarations (Gen_Decl));
4051 -- The subprogram itself cannot contain a nested instance, so the
4052 -- current parent is left empty.
4054 Set_Instance_Env (Gen_Unit, Empty);
4056 -- Build the subprogram declaration, which does not appear in the
4057 -- generic template, and give it a sloc consistent with that of the
4060 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4061 Set_Generic_Parent (Act_Spec, Gen_Unit);
4063 Make_Subprogram_Declaration (Sloc (Act_Spec),
4064 Specification => Act_Spec);
4066 Set_Categorization_From_Pragmas (Act_Decl);
4068 if Parent_Installed then
4072 Append (Act_Decl, Renaming_List);
4073 Analyze_Instance_And_Renamings;
4075 -- If the generic is marked Import (Intrinsic), then so is the
4076 -- instance. This indicates that there is no body to instantiate. If
4077 -- generic is marked inline, so it the instance, and the anonymous
4078 -- subprogram it renames. If inlined, or else if inlining is enabled
4079 -- for the compilation, we generate the instance body even if it is
4080 -- not within the main unit.
4082 -- Any other pragmas might also be inherited ???
4084 if Is_Intrinsic_Subprogram (Gen_Unit) then
4085 Set_Is_Intrinsic_Subprogram (Anon_Id);
4086 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4088 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4089 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4093 Generate_Definition (Act_Decl_Id);
4095 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4096 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4098 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4099 Check_Elab_Instantiation (N);
4102 if Is_Dispatching_Operation (Act_Decl_Id)
4103 and then Ada_Version >= Ada_05
4109 Formal := First_Formal (Act_Decl_Id);
4110 while Present (Formal) loop
4111 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4112 and then Is_Controlling_Formal (Formal)
4113 and then not Can_Never_Be_Null (Formal)
4115 Error_Msg_NE ("access parameter& is controlling,",
4117 Error_Msg_NE ("\corresponding parameter of & must be"
4118 & " explicitly null-excluding", N, Gen_Id);
4121 Next_Formal (Formal);
4126 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4128 -- Subject to change, pending on if other pragmas are inherited ???
4130 Validate_Categorization_Dependency (N, Act_Decl_Id);
4132 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4133 Inherit_Context (Gen_Decl, N);
4135 Restore_Private_Views (Pack_Id, False);
4137 -- If the context requires a full instantiation, mark node for
4138 -- subsequent construction of the body.
4140 if (Is_In_Main_Unit (N)
4141 or else Is_Inlined (Act_Decl_Id))
4142 and then (Operating_Mode = Generate_Code
4143 or else (Operating_Mode = Check_Semantics
4144 and then ASIS_Mode))
4145 and then (Expander_Active or else ASIS_Mode)
4146 and then not ABE_Is_Certain (N)
4147 and then not Is_Eliminated (Act_Decl_Id)
4149 Pending_Instantiations.Append
4151 Act_Decl => Act_Decl,
4152 Expander_Status => Expander_Active,
4153 Current_Sem_Unit => Current_Sem_Unit,
4154 Scope_Suppress => Scope_Suppress,
4155 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top));
4157 Check_Forward_Instantiation (Gen_Decl);
4159 -- The wrapper package is always delayed, because it does not
4160 -- constitute a freeze point, but to insure that the freeze
4161 -- node is placed properly, it is created directly when
4162 -- instantiating the body (otherwise the freeze node might
4163 -- appear to early for nested instantiations).
4165 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4167 -- For ASIS purposes, indicate that the wrapper package has
4168 -- replaced the instantiation node.
4170 Rewrite (N, Unit (Parent (N)));
4171 Set_Unit (Parent (N), N);
4174 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4176 -- Replace instance node for library-level instantiations of
4177 -- intrinsic subprograms, for ASIS use.
4179 Rewrite (N, Unit (Parent (N)));
4180 Set_Unit (Parent (N), N);
4183 if Parent_Installed then
4188 Env_Installed := False;
4189 Generic_Renamings.Set_Last (0);
4190 Generic_Renamings_HTable.Reset;
4194 when Instantiation_Error =>
4195 if Parent_Installed then
4199 if Env_Installed then
4202 end Analyze_Subprogram_Instantiation;
4204 -------------------------
4205 -- Get_Associated_Node --
4206 -------------------------
4208 function Get_Associated_Node (N : Node_Id) return Node_Id is
4212 Assoc := Associated_Node (N);
4214 if Nkind (Assoc) /= Nkind (N) then
4217 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4221 -- If the node is part of an inner generic, it may itself have been
4222 -- remapped into a further generic copy. Associated_Node is otherwise
4223 -- used for the entity of the node, and will be of a different node
4224 -- kind, or else N has been rewritten as a literal or function call.
4226 while Present (Associated_Node (Assoc))
4227 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4229 Assoc := Associated_Node (Assoc);
4232 -- Follow and additional link in case the final node was rewritten.
4233 -- This can only happen with nested generic units.
4235 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4236 and then Present (Associated_Node (Assoc))
4237 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4238 N_Explicit_Dereference,
4243 Assoc := Associated_Node (Assoc);
4248 end Get_Associated_Node;
4250 -------------------------------------------
4251 -- Build_Instance_Compilation_Unit_Nodes --
4252 -------------------------------------------
4254 procedure Build_Instance_Compilation_Unit_Nodes
4259 Decl_Cunit : Node_Id;
4260 Body_Cunit : Node_Id;
4262 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4263 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4266 -- A new compilation unit node is built for the instance declaration
4269 Make_Compilation_Unit (Sloc (N),
4270 Context_Items => Empty_List,
4273 Make_Compilation_Unit_Aux (Sloc (N)));
4275 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4276 Set_Body_Required (Decl_Cunit, True);
4278 -- We use the original instantiation compilation unit as the resulting
4279 -- compilation unit of the instance, since this is the main unit.
4281 Rewrite (N, Act_Body);
4282 Body_Cunit := Parent (N);
4284 -- The two compilation unit nodes are linked by the Library_Unit field
4286 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4287 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4289 -- Preserve the private nature of the package if needed
4291 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4293 -- If the instance is not the main unit, its context, categorization,
4294 -- and elaboration entity are not relevant to the compilation.
4296 if Parent (N) /= Cunit (Main_Unit) then
4300 -- The context clause items on the instantiation, which are now attached
4301 -- to the body compilation unit (since the body overwrote the original
4302 -- instantiation node), semantically belong on the spec, so copy them
4303 -- there. It's harmless to leave them on the body as well. In fact one
4304 -- could argue that they belong in both places.
4306 Citem := First (Context_Items (Body_Cunit));
4307 while Present (Citem) loop
4308 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4312 -- Propagate categorization flags on packages, so that they appear in
4313 -- the ali file for the spec of the unit.
4315 if Ekind (New_Main) = E_Package then
4316 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4317 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4318 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4319 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4320 Set_Is_Remote_Call_Interface
4321 (Old_Main, Is_Remote_Call_Interface (New_Main));
4324 -- Make entry in Units table, so that binder can generate call to
4325 -- elaboration procedure for body, if any.
4327 Make_Instance_Unit (Body_Cunit);
4328 Main_Unit_Entity := New_Main;
4329 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4331 -- Build elaboration entity, since the instance may certainly generate
4332 -- elaboration code requiring a flag for protection.
4334 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4335 end Build_Instance_Compilation_Unit_Nodes;
4337 -----------------------------
4338 -- Check_Access_Definition --
4339 -----------------------------
4341 procedure Check_Access_Definition (N : Node_Id) is
4344 (Ada_Version >= Ada_05
4345 and then Present (Access_Definition (N)));
4347 end Check_Access_Definition;
4349 -----------------------------------
4350 -- Check_Formal_Package_Instance --
4351 -----------------------------------
4353 -- If the formal has specific parameters, they must match those of the
4354 -- actual. Both of them are instances, and the renaming declarations for
4355 -- their formal parameters appear in the same order in both. The analyzed
4356 -- formal has been analyzed in the context of the current instance.
4358 procedure Check_Formal_Package_Instance
4359 (Formal_Pack : Entity_Id;
4360 Actual_Pack : Entity_Id)
4362 E1 : Entity_Id := First_Entity (Actual_Pack);
4363 E2 : Entity_Id := First_Entity (Formal_Pack);
4368 procedure Check_Mismatch (B : Boolean);
4369 -- Common error routine for mismatch between the parameters of the
4370 -- actual instance and those of the formal package.
4372 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4373 -- The formal may come from a nested formal package, and the actual may
4374 -- have been constant-folded. To determine whether the two denote the
4375 -- same entity we may have to traverse several definitions to recover
4376 -- the ultimate entity that they refer to.
4378 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4379 -- Similarly, if the formal comes from a nested formal package, the
4380 -- actual may designate the formal through multiple renamings, which
4381 -- have to be followed to determine the original variable in question.
4383 --------------------
4384 -- Check_Mismatch --
4385 --------------------
4387 procedure Check_Mismatch (B : Boolean) is
4388 Kind : constant Node_Kind := Nkind (Parent (E2));
4391 if Kind = N_Formal_Type_Declaration then
4394 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
4395 N_Formal_Package_Declaration)
4396 or else Kind in N_Formal_Subprogram_Declaration
4402 ("actual for & in actual instance does not match formal",
4403 Parent (Actual_Pack), E1);
4407 --------------------------------
4408 -- Same_Instantiated_Constant --
4409 --------------------------------
4411 function Same_Instantiated_Constant
4412 (E1, E2 : Entity_Id) return Boolean
4418 while Present (Ent) loop
4422 elsif Ekind (Ent) /= E_Constant then
4425 elsif Is_Entity_Name (Constant_Value (Ent)) then
4426 if Entity (Constant_Value (Ent)) = E1 then
4429 Ent := Entity (Constant_Value (Ent));
4432 -- The actual may be a constant that has been folded. Recover
4435 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4436 Ent := Entity (Original_Node (Constant_Value (Ent)));
4443 end Same_Instantiated_Constant;
4445 --------------------------------
4446 -- Same_Instantiated_Variable --
4447 --------------------------------
4449 function Same_Instantiated_Variable
4450 (E1, E2 : Entity_Id) return Boolean
4452 function Original_Entity (E : Entity_Id) return Entity_Id;
4453 -- Follow chain of renamings to the ultimate ancestor
4455 ---------------------
4456 -- Original_Entity --
4457 ---------------------
4459 function Original_Entity (E : Entity_Id) return Entity_Id is
4464 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4465 and then Present (Renamed_Object (Orig))
4466 and then Is_Entity_Name (Renamed_Object (Orig))
4468 Orig := Entity (Renamed_Object (Orig));
4472 end Original_Entity;
4474 -- Start of processing for Same_Instantiated_Variable
4477 return Ekind (E1) = Ekind (E2)
4478 and then Original_Entity (E1) = Original_Entity (E2);
4479 end Same_Instantiated_Variable;
4481 -- Start of processing for Check_Formal_Package_Instance
4485 and then Present (E2)
4487 exit when Ekind (E1) = E_Package
4488 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4490 -- If the formal is the renaming of the formal package, this
4491 -- is the end of its formal part, which may occur before the
4492 -- end of the formal part in the actual in the presence of
4493 -- defaulted parameters in the formal package.
4495 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4496 and then Renamed_Entity (E2) = Scope (E2);
4498 -- The analysis of the actual may generate additional internal
4499 -- entities. If the formal is defaulted, there is no corresponding
4500 -- analysis and the internal entities must be skipped, until we
4501 -- find corresponding entities again.
4503 if Comes_From_Source (E2)
4504 and then not Comes_From_Source (E1)
4505 and then Chars (E1) /= Chars (E2)
4508 and then Chars (E1) /= Chars (E2)
4517 -- If the formal entity comes from a formal declaration. it was
4518 -- defaulted in the formal package, and no check is needed on it.
4520 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4523 elsif Is_Type (E1) then
4525 -- Subtypes must statically match. E1, E2 are the local entities
4526 -- that are subtypes of the actuals. Itypes generated for other
4527 -- parameters need not be checked, the check will be performed
4528 -- on the parameters themselves.
4530 -- If E2 is a formal type declaration, it is a defaulted parameter
4531 -- and needs no checking.
4533 if not Is_Itype (E1)
4534 and then not Is_Itype (E2)
4538 or else Etype (E1) /= Etype (E2)
4539 or else not Subtypes_Statically_Match (E1, E2));
4542 elsif Ekind (E1) = E_Constant then
4544 -- IN parameters must denote the same static value, or the same
4545 -- constant, or the literal null.
4547 Expr1 := Expression (Parent (E1));
4549 if Ekind (E2) /= E_Constant then
4550 Check_Mismatch (True);
4553 Expr2 := Expression (Parent (E2));
4556 if Is_Static_Expression (Expr1) then
4558 if not Is_Static_Expression (Expr2) then
4559 Check_Mismatch (True);
4561 elsif Is_Discrete_Type (Etype (E1)) then
4563 V1 : constant Uint := Expr_Value (Expr1);
4564 V2 : constant Uint := Expr_Value (Expr2);
4566 Check_Mismatch (V1 /= V2);
4569 elsif Is_Real_Type (Etype (E1)) then
4571 V1 : constant Ureal := Expr_Value_R (Expr1);
4572 V2 : constant Ureal := Expr_Value_R (Expr2);
4574 Check_Mismatch (V1 /= V2);
4577 elsif Is_String_Type (Etype (E1))
4578 and then Nkind (Expr1) = N_String_Literal
4580 if Nkind (Expr2) /= N_String_Literal then
4581 Check_Mismatch (True);
4584 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4588 elsif Is_Entity_Name (Expr1) then
4589 if Is_Entity_Name (Expr2) then
4590 if Entity (Expr1) = Entity (Expr2) then
4594 (not Same_Instantiated_Constant
4595 (Entity (Expr1), Entity (Expr2)));
4598 Check_Mismatch (True);
4601 elsif Is_Entity_Name (Original_Node (Expr1))
4602 and then Is_Entity_Name (Expr2)
4604 Same_Instantiated_Constant
4605 (Entity (Original_Node (Expr1)), Entity (Expr2))
4609 elsif Nkind (Expr1) = N_Null then
4610 Check_Mismatch (Nkind (Expr1) /= N_Null);
4613 Check_Mismatch (True);
4616 elsif Ekind (E1) = E_Variable then
4617 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4619 elsif Ekind (E1) = E_Package then
4621 (Ekind (E1) /= Ekind (E2)
4622 or else Renamed_Object (E1) /= Renamed_Object (E2));
4624 elsif Is_Overloadable (E1) then
4626 -- Verify that the actual subprograms match. Note that actuals
4627 -- that are attributes are rewritten as subprograms. If the
4628 -- subprogram in the formal package is defaulted, no check is
4629 -- needed. Note that this can only happen in Ada2005 when the
4630 -- formal package can be partially parametrized.
4632 if Nkind (Unit_Declaration_Node (E1)) =
4633 N_Subprogram_Renaming_Declaration
4634 and then From_Default (Unit_Declaration_Node (E1))
4640 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
4644 raise Program_Error;
4651 end Check_Formal_Package_Instance;
4653 ---------------------------
4654 -- Check_Formal_Packages --
4655 ---------------------------
4657 procedure Check_Formal_Packages (P_Id : Entity_Id) is
4659 Formal_P : Entity_Id;
4662 -- Iterate through the declarations in the instance, looking for package
4663 -- renaming declarations that denote instances of formal packages. Stop
4664 -- when we find the renaming of the current package itself. The
4665 -- declaration for a formal package without a box is followed by an
4666 -- internal entity that repeats the instantiation.
4668 E := First_Entity (P_Id);
4669 while Present (E) loop
4670 if Ekind (E) = E_Package then
4671 if Renamed_Object (E) = P_Id then
4674 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4677 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
4678 Formal_P := Next_Entity (E);
4679 Check_Formal_Package_Instance (Formal_P, E);
4681 -- After checking, remove the internal validating package. It
4682 -- is only needed for semantic checks, and as it may contain
4683 -- generic formal declarations it should not reach gigi.
4685 Remove (Unit_Declaration_Node (Formal_P));
4691 end Check_Formal_Packages;
4693 ---------------------------------
4694 -- Check_Forward_Instantiation --
4695 ---------------------------------
4697 procedure Check_Forward_Instantiation (Decl : Node_Id) is
4699 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
4702 -- The instantiation appears before the generic body if we are in the
4703 -- scope of the unit containing the generic, either in its spec or in
4704 -- the package body. and before the generic body.
4706 if Ekind (Gen_Comp) = E_Package_Body then
4707 Gen_Comp := Spec_Entity (Gen_Comp);
4710 if In_Open_Scopes (Gen_Comp)
4711 and then No (Corresponding_Body (Decl))
4716 and then not Is_Compilation_Unit (S)
4717 and then not Is_Child_Unit (S)
4719 if Ekind (S) = E_Package then
4720 Set_Has_Forward_Instantiation (S);
4726 end Check_Forward_Instantiation;
4728 ---------------------------
4729 -- Check_Generic_Actuals --
4730 ---------------------------
4732 -- The visibility of the actuals may be different between the point of
4733 -- generic instantiation and the instantiation of the body.
4735 procedure Check_Generic_Actuals
4736 (Instance : Entity_Id;
4737 Is_Formal_Box : Boolean)
4742 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
4743 -- For a formal that is an array type, the component type is often a
4744 -- previous formal in the same unit. The privacy status of the component
4745 -- type will have been examined earlier in the traversal of the
4746 -- corresponding actuals, and this status should not be modified for the
4747 -- array type itself.
4749 -- To detect this case we have to rescan the list of formals, which
4750 -- is usually short enough to ignore the resulting inefficiency.
4752 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
4755 Prev := First_Entity (Instance);
4756 while Present (Prev) loop
4758 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
4759 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
4760 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
4770 end Denotes_Previous_Actual;
4772 -- Start of processing for Check_Generic_Actuals
4775 E := First_Entity (Instance);
4776 while Present (E) loop
4778 and then Nkind (Parent (E)) = N_Subtype_Declaration
4779 and then Scope (Etype (E)) /= Instance
4780 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
4782 if Is_Array_Type (E)
4783 and then Denotes_Previous_Actual (Component_Type (E))
4787 Check_Private_View (Subtype_Indication (Parent (E)));
4789 Set_Is_Generic_Actual_Type (E, True);
4790 Set_Is_Hidden (E, False);
4791 Set_Is_Potentially_Use_Visible (E,
4794 -- We constructed the generic actual type as a subtype of the
4795 -- supplied type. This means that it normally would not inherit
4796 -- subtype specific attributes of the actual, which is wrong for
4797 -- the generic case.
4799 Astype := Ancestor_Subtype (E);
4803 -- This can happen when E is an itype that is the full view of
4804 -- a private type completed, e.g. with a constrained array. In
4805 -- that case, use the first subtype, which will carry size
4806 -- information. The base type itself is unconstrained and will
4809 Astype := First_Subtype (E);
4812 Set_Size_Info (E, (Astype));
4813 Set_RM_Size (E, RM_Size (Astype));
4814 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4816 if Is_Discrete_Or_Fixed_Point_Type (E) then
4817 Set_RM_Size (E, RM_Size (Astype));
4819 -- In nested instances, the base type of an access actual
4820 -- may itself be private, and need to be exchanged.
4822 elsif Is_Access_Type (E)
4823 and then Is_Private_Type (Etype (E))
4826 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4829 elsif Ekind (E) = E_Package then
4831 -- If this is the renaming for the current instance, we're done.
4832 -- Otherwise it is a formal package. If the corresponding formal
4833 -- was declared with a box, the (instantiations of the) generic
4834 -- formal part are also visible. Otherwise, ignore the entity
4835 -- created to validate the actuals.
4837 if Renamed_Object (E) = Instance then
4840 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4843 -- The visibility of a formal of an enclosing generic is already
4846 elsif Denotes_Formal_Package (E) then
4849 elsif Present (Associated_Formal_Package (E))
4850 and then not Is_Generic_Formal (E)
4852 if Box_Present (Parent (Associated_Formal_Package (E))) then
4853 Check_Generic_Actuals (Renamed_Object (E), True);
4856 Check_Generic_Actuals (Renamed_Object (E), False);
4859 Set_Is_Hidden (E, False);
4862 -- If this is a subprogram instance (in a wrapper package) the
4863 -- actual is fully visible.
4865 elsif Is_Wrapper_Package (Instance) then
4866 Set_Is_Hidden (E, False);
4868 -- If the formal package is declared with a box, or if the formal
4869 -- parameter is defaulted, it is visible in the body.
4872 or else Is_Visible_Formal (E)
4874 Set_Is_Hidden (E, False);
4879 end Check_Generic_Actuals;
4881 ------------------------------
4882 -- Check_Generic_Child_Unit --
4883 ------------------------------
4885 procedure Check_Generic_Child_Unit
4887 Parent_Installed : in out Boolean)
4889 Loc : constant Source_Ptr := Sloc (Gen_Id);
4890 Gen_Par : Entity_Id := Empty;
4892 Inst_Par : Entity_Id;
4895 function Find_Generic_Child
4897 Id : Node_Id) return Entity_Id;
4898 -- Search generic parent for possible child unit with the given name
4900 function In_Enclosing_Instance return Boolean;
4901 -- Within an instance of the parent, the child unit may be denoted
4902 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4903 -- scopes to locate a possible parent instantiation.
4905 ------------------------
4906 -- Find_Generic_Child --
4907 ------------------------
4909 function Find_Generic_Child
4911 Id : Node_Id) return Entity_Id
4916 -- If entity of name is already set, instance has already been
4917 -- resolved, e.g. in an enclosing instantiation.
4919 if Present (Entity (Id)) then
4920 if Scope (Entity (Id)) = Scop then
4927 E := First_Entity (Scop);
4928 while Present (E) loop
4929 if Chars (E) = Chars (Id)
4930 and then Is_Child_Unit (E)
4932 if Is_Child_Unit (E)
4933 and then not Is_Visible_Child_Unit (E)
4936 ("generic child unit& is not visible", Gen_Id, E);
4948 end Find_Generic_Child;
4950 ---------------------------
4951 -- In_Enclosing_Instance --
4952 ---------------------------
4954 function In_Enclosing_Instance return Boolean is
4955 Enclosing_Instance : Node_Id;
4956 Instance_Decl : Node_Id;
4959 -- We do not inline any call that contains instantiations, except
4960 -- for instantiations of Unchecked_Conversion, so if we are within
4961 -- an inlined body the current instance does not require parents.
4963 if In_Inlined_Body then
4964 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
4968 -- Loop to check enclosing scopes
4970 Enclosing_Instance := Current_Scope;
4971 while Present (Enclosing_Instance) loop
4972 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4974 if Ekind (Enclosing_Instance) = E_Package
4975 and then Is_Generic_Instance (Enclosing_Instance)
4977 (Generic_Parent (Specification (Instance_Decl)))
4979 -- Check whether the generic we are looking for is a child of
4982 E := Find_Generic_Child
4983 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4984 exit when Present (E);
4990 Enclosing_Instance := Scope (Enclosing_Instance);
5002 Make_Expanded_Name (Loc,
5004 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5005 Selector_Name => New_Occurrence_Of (E, Loc)));
5007 Set_Entity (Gen_Id, E);
5008 Set_Etype (Gen_Id, Etype (E));
5009 Parent_Installed := False; -- Already in scope.
5012 end In_Enclosing_Instance;
5014 -- Start of processing for Check_Generic_Child_Unit
5017 -- If the name of the generic is given by a selected component, it may
5018 -- be the name of a generic child unit, and the prefix is the name of an
5019 -- instance of the parent, in which case the child unit must be visible.
5020 -- If this instance is not in scope, it must be placed there and removed
5021 -- after instantiation, because what is being instantiated is not the
5022 -- original child, but the corresponding child present in the instance
5025 -- If the child is instantiated within the parent, it can be given by
5026 -- a simple name. In this case the instance is already in scope, but
5027 -- the child generic must be recovered from the generic parent as well.
5029 if Nkind (Gen_Id) = N_Selected_Component then
5030 S := Selector_Name (Gen_Id);
5031 Analyze (Prefix (Gen_Id));
5032 Inst_Par := Entity (Prefix (Gen_Id));
5034 if Ekind (Inst_Par) = E_Package
5035 and then Present (Renamed_Object (Inst_Par))
5037 Inst_Par := Renamed_Object (Inst_Par);
5040 if Ekind (Inst_Par) = E_Package then
5041 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5042 Gen_Par := Generic_Parent (Parent (Inst_Par));
5044 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5046 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5048 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5051 elsif Ekind (Inst_Par) = E_Generic_Package
5052 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5054 -- A formal package may be a real child package, and not the
5055 -- implicit instance within a parent. In this case the child is
5056 -- not visible and has to be retrieved explicitly as well.
5058 Gen_Par := Inst_Par;
5061 if Present (Gen_Par) then
5063 -- The prefix denotes an instantiation. The entity itself may be a
5064 -- nested generic, or a child unit.
5066 E := Find_Generic_Child (Gen_Par, S);
5069 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5070 Set_Entity (Gen_Id, E);
5071 Set_Etype (Gen_Id, Etype (E));
5073 Set_Etype (S, Etype (E));
5075 -- Indicate that this is a reference to the parent
5077 if In_Extended_Main_Source_Unit (Gen_Id) then
5078 Set_Is_Instantiated (Inst_Par);
5081 -- A common mistake is to replicate the naming scheme of a
5082 -- hierarchy by instantiating a generic child directly, rather
5083 -- than the implicit child in a parent instance:
5085 -- generic .. package Gpar is ..
5086 -- generic .. package Gpar.Child is ..
5087 -- package Par is new Gpar ();
5090 -- package Par.Child is new Gpar.Child ();
5091 -- rather than Par.Child
5093 -- In this case the instantiation is within Par, which is an
5094 -- instance, but Gpar does not denote Par because we are not IN
5095 -- the instance of Gpar, so this is illegal. The test below
5096 -- recognizes this particular case.
5098 if Is_Child_Unit (E)
5099 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5100 and then (not In_Instance
5101 or else Nkind (Parent (Parent (Gen_Id))) =
5105 ("prefix of generic child unit must be instance of parent",
5109 if not In_Open_Scopes (Inst_Par)
5110 and then Nkind (Parent (Gen_Id)) not in
5111 N_Generic_Renaming_Declaration
5113 Install_Parent (Inst_Par);
5114 Parent_Installed := True;
5116 elsif In_Open_Scopes (Inst_Par) then
5118 -- If the parent is already installed verify that the
5119 -- actuals for its formal packages declared with a box
5120 -- are already installed. This is necessary when the
5121 -- child instance is a child of the parent instance.
5122 -- In this case the parent is placed on the scope stack
5123 -- but the formal packages are not made visible.
5125 Install_Formal_Packages (Inst_Par);
5129 -- If the generic parent does not contain an entity that
5130 -- corresponds to the selector, the instance doesn't either.
5131 -- Analyzing the node will yield the appropriate error message.
5132 -- If the entity is not a child unit, then it is an inner
5133 -- generic in the parent.
5141 if Is_Child_Unit (Entity (Gen_Id))
5143 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5144 and then not In_Open_Scopes (Inst_Par)
5146 Install_Parent (Inst_Par);
5147 Parent_Installed := True;
5151 elsif Nkind (Gen_Id) = N_Expanded_Name then
5153 -- Entity already present, analyze prefix, whose meaning may be
5154 -- an instance in the current context. If it is an instance of
5155 -- a relative within another, the proper parent may still have
5156 -- to be installed, if they are not of the same generation.
5158 Analyze (Prefix (Gen_Id));
5160 -- In the unlikely case that a local declaration hides the name
5161 -- of the parent package, locate it on the homonym chain. If the
5162 -- context is an instance of the parent, the renaming entity is
5165 Inst_Par := Entity (Prefix (Gen_Id));
5166 while Present (Inst_Par)
5167 and then Ekind (Inst_Par) /= E_Package
5168 and then Ekind (Inst_Par) /= E_Generic_Package
5170 Inst_Par := Homonym (Inst_Par);
5173 pragma Assert (Present (Inst_Par));
5174 Set_Entity (Prefix (Gen_Id), Inst_Par);
5176 if In_Enclosing_Instance then
5179 elsif Present (Entity (Gen_Id))
5180 and then Is_Child_Unit (Entity (Gen_Id))
5181 and then not In_Open_Scopes (Inst_Par)
5183 Install_Parent (Inst_Par);
5184 Parent_Installed := True;
5187 elsif In_Enclosing_Instance then
5189 -- The child unit is found in some enclosing scope
5196 -- If this is the renaming of the implicit child in a parent
5197 -- instance, recover the parent name and install it.
5199 if Is_Entity_Name (Gen_Id) then
5200 E := Entity (Gen_Id);
5202 if Is_Generic_Unit (E)
5203 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5204 and then Is_Child_Unit (Renamed_Object (E))
5205 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5206 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5209 New_Copy_Tree (Name (Parent (E))));
5210 Inst_Par := Entity (Prefix (Gen_Id));
5212 if not In_Open_Scopes (Inst_Par) then
5213 Install_Parent (Inst_Par);
5214 Parent_Installed := True;
5217 -- If it is a child unit of a non-generic parent, it may be
5218 -- use-visible and given by a direct name. Install parent as
5221 elsif Is_Generic_Unit (E)
5222 and then Is_Child_Unit (E)
5224 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5225 and then not Is_Generic_Unit (Scope (E))
5227 if not In_Open_Scopes (Scope (E)) then
5228 Install_Parent (Scope (E));
5229 Parent_Installed := True;
5234 end Check_Generic_Child_Unit;
5236 -----------------------------
5237 -- Check_Hidden_Child_Unit --
5238 -----------------------------
5240 procedure Check_Hidden_Child_Unit
5242 Gen_Unit : Entity_Id;
5243 Act_Decl_Id : Entity_Id)
5245 Gen_Id : constant Node_Id := Name (N);
5248 if Is_Child_Unit (Gen_Unit)
5249 and then Is_Child_Unit (Act_Decl_Id)
5250 and then Nkind (Gen_Id) = N_Expanded_Name
5251 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5252 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5254 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5256 ("generic unit & is implicitly declared in &",
5257 Defining_Unit_Name (N), Gen_Unit);
5258 Error_Msg_N ("\instance must have different name",
5259 Defining_Unit_Name (N));
5261 end Check_Hidden_Child_Unit;
5263 ------------------------
5264 -- Check_Private_View --
5265 ------------------------
5267 procedure Check_Private_View (N : Node_Id) is
5268 T : constant Entity_Id := Etype (N);
5272 -- Exchange views if the type was not private in the generic but is
5273 -- private at the point of instantiation. Do not exchange views if
5274 -- the scope of the type is in scope. This can happen if both generic
5275 -- and instance are sibling units, or if type is defined in a parent.
5276 -- In this case the visibility of the type will be correct for all
5280 BT := Base_Type (T);
5282 if Is_Private_Type (T)
5283 and then not Has_Private_View (N)
5284 and then Present (Full_View (T))
5285 and then not In_Open_Scopes (Scope (T))
5287 -- In the generic, the full type was visible. Save the private
5288 -- entity, for subsequent exchange.
5292 elsif Has_Private_View (N)
5293 and then not Is_Private_Type (T)
5294 and then not Has_Been_Exchanged (T)
5295 and then Etype (Get_Associated_Node (N)) /= T
5297 -- Only the private declaration was visible in the generic. If
5298 -- the type appears in a subtype declaration, the subtype in the
5299 -- instance must have a view compatible with that of its parent,
5300 -- which must be exchanged (see corresponding code in Restore_
5301 -- Private_Views). Otherwise, if the type is defined in a parent
5302 -- unit, leave full visibility within instance, which is safe.
5304 if In_Open_Scopes (Scope (Base_Type (T)))
5305 and then not Is_Private_Type (Base_Type (T))
5306 and then Comes_From_Source (Base_Type (T))
5310 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5311 or else not In_Private_Part (Scope (Base_Type (T)))
5313 Prepend_Elmt (T, Exchanged_Views);
5314 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5317 -- For composite types with inconsistent representation exchange
5318 -- component types accordingly.
5320 elsif Is_Access_Type (T)
5321 and then Is_Private_Type (Designated_Type (T))
5322 and then not Has_Private_View (N)
5323 and then Present (Full_View (Designated_Type (T)))
5325 Switch_View (Designated_Type (T));
5327 elsif Is_Array_Type (T) then
5328 if Is_Private_Type (Component_Type (T))
5329 and then not Has_Private_View (N)
5330 and then Present (Full_View (Component_Type (T)))
5332 Switch_View (Component_Type (T));
5335 -- The normal exchange mechanism relies on the setting of a
5336 -- flag on the reference in the generic. However, an additional
5337 -- mechanism is needed for types that are not explicitly mentioned
5338 -- in the generic, but may be needed in expanded code in the
5339 -- instance. This includes component types of arrays and
5340 -- designated types of access types. This processing must also
5341 -- include the index types of arrays which we take care of here.
5348 Indx := First_Index (T);
5349 Typ := Base_Type (Etype (Indx));
5350 while Present (Indx) loop
5351 if Is_Private_Type (Typ)
5352 and then Present (Full_View (Typ))
5361 elsif Is_Private_Type (T)
5362 and then Present (Full_View (T))
5363 and then Is_Array_Type (Full_View (T))
5364 and then Is_Private_Type (Component_Type (Full_View (T)))
5368 -- Finally, a non-private subtype may have a private base type, which
5369 -- must be exchanged for consistency. This can happen when a package
5370 -- body is instantiated, when the scope stack is empty but in fact
5371 -- the subtype and the base type are declared in an enclosing scope.
5373 -- Note that in this case we introduce an inconsistency in the view
5374 -- set, because we switch the base type BT, but there could be some
5375 -- private dependent subtypes of BT which remain unswitched. Such
5376 -- subtypes might need to be switched at a later point (see specific
5377 -- provision for that case in Switch_View).
5379 elsif not Is_Private_Type (T)
5380 and then not Has_Private_View (N)
5381 and then Is_Private_Type (BT)
5382 and then Present (Full_View (BT))
5383 and then not Is_Generic_Type (BT)
5384 and then not In_Open_Scopes (BT)
5386 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5387 Exchange_Declarations (BT);
5390 end Check_Private_View;
5392 --------------------------
5393 -- Contains_Instance_Of --
5394 --------------------------
5396 function Contains_Instance_Of
5399 N : Node_Id) return Boolean
5407 -- Verify that there are no circular instantiations. We check whether
5408 -- the unit contains an instance of the current scope or some enclosing
5409 -- scope (in case one of the instances appears in a subunit). Longer
5410 -- circularities involving subunits might seem too pathological to
5411 -- consider, but they were not too pathological for the authors of
5412 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5413 -- enclosing generic scopes as containing an instance.
5416 -- Within a generic subprogram body, the scope is not generic, to
5417 -- allow for recursive subprograms. Use the declaration to determine
5418 -- whether this is a generic unit.
5420 if Ekind (Scop) = E_Generic_Package
5421 or else (Is_Subprogram (Scop)
5422 and then Nkind (Unit_Declaration_Node (Scop)) =
5423 N_Generic_Subprogram_Declaration)
5425 Elmt := First_Elmt (Inner_Instances (Inner));
5427 while Present (Elmt) loop
5428 if Node (Elmt) = Scop then
5429 Error_Msg_Node_2 := Inner;
5431 ("circular Instantiation: & instantiated within &!",
5435 elsif Node (Elmt) = Inner then
5438 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5439 Error_Msg_Node_2 := Inner;
5441 ("circular Instantiation: & instantiated within &!",
5449 -- Indicate that Inner is being instantiated within Scop
5451 Append_Elmt (Inner, Inner_Instances (Scop));
5454 if Scop = Standard_Standard then
5457 Scop := Scope (Scop);
5462 end Contains_Instance_Of;
5464 -----------------------
5465 -- Copy_Generic_Node --
5466 -----------------------
5468 function Copy_Generic_Node
5470 Parent_Id : Node_Id;
5471 Instantiating : Boolean) return Node_Id
5476 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5477 -- Check the given value of one of the Fields referenced by the
5478 -- current node to determine whether to copy it recursively. The
5479 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5480 -- value (Sloc, Uint, Char) in which case it need not be copied.
5482 procedure Copy_Descendants;
5483 -- Common utility for various nodes
5485 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5486 -- Make copy of element list
5488 function Copy_Generic_List
5490 Parent_Id : Node_Id) return List_Id;
5491 -- Apply Copy_Node recursively to the members of a node list
5493 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5494 -- True if an identifier is part of the defining program unit name
5495 -- of a child unit. The entity of such an identifier must be kept
5496 -- (for ASIS use) even though as the name of an enclosing generic
5497 -- it would otherwise not be preserved in the generic tree.
5499 ----------------------
5500 -- Copy_Descendants --
5501 ----------------------
5503 procedure Copy_Descendants is
5505 use Atree.Unchecked_Access;
5506 -- This code section is part of the implementation of an untyped
5507 -- tree traversal, so it needs direct access to node fields.
5510 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5511 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5512 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5513 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5514 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5515 end Copy_Descendants;
5517 -----------------------------
5518 -- Copy_Generic_Descendant --
5519 -----------------------------
5521 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5523 if D = Union_Id (Empty) then
5526 elsif D in Node_Range then
5528 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5530 elsif D in List_Range then
5531 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5533 elsif D in Elist_Range then
5534 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5536 -- Nothing else is copyable (e.g. Uint values), return as is
5541 end Copy_Generic_Descendant;
5543 ------------------------
5544 -- Copy_Generic_Elist --
5545 ------------------------
5547 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
5554 M := First_Elmt (E);
5555 while Present (M) loop
5557 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
5566 end Copy_Generic_Elist;
5568 -----------------------
5569 -- Copy_Generic_List --
5570 -----------------------
5572 function Copy_Generic_List
5574 Parent_Id : Node_Id) return List_Id
5582 Set_Parent (New_L, Parent_Id);
5585 while Present (N) loop
5586 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
5595 end Copy_Generic_List;
5597 ---------------------------
5598 -- In_Defining_Unit_Name --
5599 ---------------------------
5601 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
5603 return Present (Parent (Nam))
5604 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
5606 (Nkind (Parent (Nam)) = N_Expanded_Name
5607 and then In_Defining_Unit_Name (Parent (Nam))));
5608 end In_Defining_Unit_Name;
5610 -- Start of processing for Copy_Generic_Node
5617 New_N := New_Copy (N);
5619 if Instantiating then
5620 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
5623 if not Is_List_Member (N) then
5624 Set_Parent (New_N, Parent_Id);
5627 -- If defining identifier, then all fields have been copied already
5629 if Nkind (New_N) in N_Entity then
5632 -- Special casing for identifiers and other entity names and operators
5634 elsif Nkind_In (New_N, N_Identifier,
5635 N_Character_Literal,
5638 or else Nkind (New_N) in N_Op
5640 if not Instantiating then
5642 -- Link both nodes in order to assign subsequently the
5643 -- entity of the copy to the original node, in case this
5644 -- is a global reference.
5646 Set_Associated_Node (N, New_N);
5648 -- If we are within an instantiation, this is a nested generic
5649 -- that has already been analyzed at the point of definition. We
5650 -- must preserve references that were global to the enclosing
5651 -- parent at that point. Other occurrences, whether global or
5652 -- local to the current generic, must be resolved anew, so we
5653 -- reset the entity in the generic copy. A global reference has a
5654 -- smaller depth than the parent, or else the same depth in case
5655 -- both are distinct compilation units.
5656 -- A child unit is implicitly declared within the enclosing parent
5657 -- but is in fact global to it, and must be preserved.
5659 -- It is also possible for Current_Instantiated_Parent to be
5660 -- defined, and for this not to be a nested generic, namely if the
5661 -- unit is loaded through Rtsfind. In that case, the entity of
5662 -- New_N is only a link to the associated node, and not a defining
5665 -- The entities for parent units in the defining_program_unit of a
5666 -- generic child unit are established when the context of the unit
5667 -- is first analyzed, before the generic copy is made. They are
5668 -- preserved in the copy for use in ASIS queries.
5670 Ent := Entity (New_N);
5672 if No (Current_Instantiated_Parent.Gen_Id) then
5674 or else Nkind (Ent) /= N_Defining_Identifier
5675 or else not In_Defining_Unit_Name (N)
5677 Set_Associated_Node (New_N, Empty);
5682 not Nkind_In (Ent, N_Defining_Identifier,
5683 N_Defining_Character_Literal,
5684 N_Defining_Operator_Symbol)
5685 or else No (Scope (Ent))
5687 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
5688 and then not Is_Child_Unit (Ent))
5690 (Scope_Depth (Scope (Ent)) >
5691 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
5693 Get_Source_Unit (Ent) =
5694 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
5696 Set_Associated_Node (New_N, Empty);
5699 -- Case of instantiating identifier or some other name or operator
5702 -- If the associated node is still defined, the entity in it is
5703 -- global, and must be copied to the instance. If this copy is
5704 -- being made for a body to inline, it is applied to an
5705 -- instantiated tree, and the entity is already present and must
5706 -- be also preserved.
5709 Assoc : constant Node_Id := Get_Associated_Node (N);
5712 if Present (Assoc) then
5713 if Nkind (Assoc) = Nkind (N) then
5714 Set_Entity (New_N, Entity (Assoc));
5715 Check_Private_View (N);
5717 elsif Nkind (Assoc) = N_Function_Call then
5718 Set_Entity (New_N, Entity (Name (Assoc)));
5720 elsif Nkind_In (Assoc, N_Defining_Identifier,
5721 N_Defining_Character_Literal,
5722 N_Defining_Operator_Symbol)
5723 and then Expander_Active
5725 -- Inlining case: we are copying a tree that contains
5726 -- global entities, which are preserved in the copy to be
5727 -- used for subsequent inlining.
5732 Set_Entity (New_N, Empty);
5738 -- For expanded name, we must copy the Prefix and Selector_Name
5740 if Nkind (N) = N_Expanded_Name then
5742 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
5744 Set_Selector_Name (New_N,
5745 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
5747 -- For operators, we must copy the right operand
5749 elsif Nkind (N) in N_Op then
5750 Set_Right_Opnd (New_N,
5751 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
5753 -- And for binary operators, the left operand as well
5755 if Nkind (N) in N_Binary_Op then
5756 Set_Left_Opnd (New_N,
5757 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
5761 -- Special casing for stubs
5763 elsif Nkind (N) in N_Body_Stub then
5765 -- In any case, we must copy the specification or defining
5766 -- identifier as appropriate.
5768 if Nkind (N) = N_Subprogram_Body_Stub then
5769 Set_Specification (New_N,
5770 Copy_Generic_Node (Specification (N), New_N, Instantiating));
5773 Set_Defining_Identifier (New_N,
5775 (Defining_Identifier (N), New_N, Instantiating));
5778 -- If we are not instantiating, then this is where we load and
5779 -- analyze subunits, i.e. at the point where the stub occurs. A
5780 -- more permissivle system might defer this analysis to the point
5781 -- of instantiation, but this seems to complicated for now.
5783 if not Instantiating then
5785 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
5787 Unum : Unit_Number_Type;
5793 (Load_Name => Subunit_Name,
5798 -- If the proper body is not found, a warning message will be
5799 -- emitted when analyzing the stub, or later at the the point
5800 -- of instantiation. Here we just leave the stub as is.
5802 if Unum = No_Unit then
5803 Subunits_Missing := True;
5804 goto Subunit_Not_Found;
5807 Subunit := Cunit (Unum);
5809 if Nkind (Unit (Subunit)) /= N_Subunit then
5811 ("found child unit instead of expected SEPARATE subunit",
5813 Error_Msg_Sloc := Sloc (N);
5814 Error_Msg_N ("\to complete stub #", Subunit);
5815 goto Subunit_Not_Found;
5818 -- We must create a generic copy of the subunit, in order to
5819 -- perform semantic analysis on it, and we must replace the
5820 -- stub in the original generic unit with the subunit, in order
5821 -- to preserve non-local references within.
5823 -- Only the proper body needs to be copied. Library_Unit and
5824 -- context clause are simply inherited by the generic copy.
5825 -- Note that the copy (which may be recursive if there are
5826 -- nested subunits) must be done first, before attaching it to
5827 -- the enclosing generic.
5831 (Proper_Body (Unit (Subunit)),
5832 Empty, Instantiating => False);
5834 -- Now place the original proper body in the original generic
5835 -- unit. This is a body, not a compilation unit.
5837 Rewrite (N, Proper_Body (Unit (Subunit)));
5838 Set_Is_Compilation_Unit (Defining_Entity (N), False);
5839 Set_Was_Originally_Stub (N);
5841 -- Finally replace the body of the subunit with its copy, and
5842 -- make this new subunit into the library unit of the generic
5843 -- copy, which does not have stubs any longer.
5845 Set_Proper_Body (Unit (Subunit), New_Body);
5846 Set_Library_Unit (New_N, Subunit);
5847 Inherit_Context (Unit (Subunit), N);
5850 -- If we are instantiating, this must be an error case, since
5851 -- otherwise we would have replaced the stub node by the proper body
5852 -- that corresponds. So just ignore it in the copy (i.e. we have
5853 -- copied it, and that is good enough).
5859 <<Subunit_Not_Found>> null;
5861 -- If the node is a compilation unit, it is the subunit of a stub, which
5862 -- has been loaded already (see code below). In this case, the library
5863 -- unit field of N points to the parent unit (which is a compilation
5864 -- unit) and need not (and cannot!) be copied.
5866 -- When the proper body of the stub is analyzed, thie library_unit link
5867 -- is used to establish the proper context (see sem_ch10).
5869 -- The other fields of a compilation unit are copied as usual
5871 elsif Nkind (N) = N_Compilation_Unit then
5873 -- This code can only be executed when not instantiating, because in
5874 -- the copy made for an instantiation, the compilation unit node has
5875 -- disappeared at the point that a stub is replaced by its proper
5878 pragma Assert (not Instantiating);
5880 Set_Context_Items (New_N,
5881 Copy_Generic_List (Context_Items (N), New_N));
5884 Copy_Generic_Node (Unit (N), New_N, False));
5886 Set_First_Inlined_Subprogram (New_N,
5888 (First_Inlined_Subprogram (N), New_N, False));
5890 Set_Aux_Decls_Node (New_N,
5891 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
5893 -- For an assignment node, the assignment is known to be semantically
5894 -- legal if we are instantiating the template. This avoids incorrect
5895 -- diagnostics in generated code.
5897 elsif Nkind (N) = N_Assignment_Statement then
5899 -- Copy name and expression fields in usual manner
5902 Copy_Generic_Node (Name (N), New_N, Instantiating));
5904 Set_Expression (New_N,
5905 Copy_Generic_Node (Expression (N), New_N, Instantiating));
5907 if Instantiating then
5908 Set_Assignment_OK (Name (New_N), True);
5911 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
5912 if not Instantiating then
5913 Set_Associated_Node (N, New_N);
5916 if Present (Get_Associated_Node (N))
5917 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
5919 -- In the generic the aggregate has some composite type. If at
5920 -- the point of instantiation the type has a private view,
5921 -- install the full view (and that of its ancestors, if any).
5924 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
5929 and then Is_Private_Type (T)
5935 and then Is_Tagged_Type (T)
5936 and then Is_Derived_Type (T)
5938 Rt := Root_Type (T);
5943 if Is_Private_Type (T) then
5954 -- Do not copy the associated node, which points to
5955 -- the generic copy of the aggregate.
5958 use Atree.Unchecked_Access;
5959 -- This code section is part of the implementation of an untyped
5960 -- tree traversal, so it needs direct access to node fields.
5963 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5964 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5965 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5966 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5969 -- Allocators do not have an identifier denoting the access type,
5970 -- so we must locate it through the expression to check whether
5971 -- the views are consistent.
5973 elsif Nkind (N) = N_Allocator
5974 and then Nkind (Expression (N)) = N_Qualified_Expression
5975 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
5976 and then Instantiating
5979 T : constant Node_Id :=
5980 Get_Associated_Node (Subtype_Mark (Expression (N)));
5986 -- Retrieve the allocator node in the generic copy
5988 Acc_T := Etype (Parent (Parent (T)));
5990 and then Is_Private_Type (Acc_T)
5992 Switch_View (Acc_T);
5999 -- For a proper body, we must catch the case of a proper body that
6000 -- replaces a stub. This represents the point at which a separate
6001 -- compilation unit, and hence template file, may be referenced, so we
6002 -- must make a new source instantiation entry for the template of the
6003 -- subunit, and ensure that all nodes in the subunit are adjusted using
6004 -- this new source instantiation entry.
6006 elsif Nkind (N) in N_Proper_Body then
6008 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6011 if Instantiating and then Was_Originally_Stub (N) then
6012 Create_Instantiation_Source
6013 (Instantiation_Node,
6014 Defining_Entity (N),
6019 -- Now copy the fields of the proper body, using the new
6020 -- adjustment factor if one was needed as per test above.
6024 -- Restore the original adjustment factor in case changed
6026 S_Adjustment := Save_Adjustment;
6029 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6030 -- generic unit, not to the instantiating unit.
6032 elsif Nkind (N) = N_Pragma
6033 and then Instantiating
6036 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6038 if Prag_Id = Pragma_Ident
6039 or else Prag_Id = Pragma_Comment
6041 New_N := Make_Null_Statement (Sloc (N));
6047 elsif Nkind_In (N, N_Integer_Literal,
6051 -- No descendant fields need traversing
6055 -- For the remaining nodes, copy recursively their descendants
6061 and then Nkind (N) = N_Subprogram_Body
6063 Set_Generic_Parent (Specification (New_N), N);
6068 end Copy_Generic_Node;
6070 ----------------------------
6071 -- Denotes_Formal_Package --
6072 ----------------------------
6074 function Denotes_Formal_Package
6076 On_Exit : Boolean := False) return Boolean
6079 Scop : constant Entity_Id := Scope (Pack);
6086 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6088 Par := Current_Instantiated_Parent.Act_Id;
6091 if Ekind (Scop) = E_Generic_Package
6092 or else Nkind (Unit_Declaration_Node (Scop)) =
6093 N_Generic_Subprogram_Declaration
6097 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6098 N_Formal_Package_Declaration
6106 -- Check whether this package is associated with a formal package of
6107 -- the enclosing instantiation. Iterate over the list of renamings.
6109 E := First_Entity (Par);
6110 while Present (E) loop
6111 if Ekind (E) /= E_Package
6112 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6116 elsif Renamed_Object (E) = Par then
6119 elsif Renamed_Object (E) = Pack then
6128 end Denotes_Formal_Package;
6134 procedure End_Generic is
6136 -- ??? More things could be factored out in this routine. Should
6137 -- probably be done at a later stage.
6139 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6140 Generic_Flags.Decrement_Last;
6142 Expander_Mode_Restore;
6145 ----------------------
6146 -- Find_Actual_Type --
6147 ----------------------
6149 function Find_Actual_Type
6151 Gen_Type : Entity_Id) return Entity_Id
6153 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
6157 -- Special processing only applies to child units
6159 if not Is_Child_Unit (Gen_Scope) then
6160 return Get_Instance_Of (Typ);
6162 -- If designated or component type is itself a formal of the child unit,
6163 -- its instance is available.
6165 elsif Scope (Typ) = Gen_Scope then
6166 return Get_Instance_Of (Typ);
6168 -- If the array or access type is not declared in the parent unit,
6169 -- no special processing needed.
6171 elsif not Is_Generic_Type (Typ)
6172 and then Scope (Gen_Scope) /= Scope (Typ)
6174 return Get_Instance_Of (Typ);
6176 -- Otherwise, retrieve designated or component type by visibility
6179 T := Current_Entity (Typ);
6180 while Present (T) loop
6181 if In_Open_Scopes (Scope (T)) then
6184 elsif Is_Generic_Actual_Type (T) then
6193 end Find_Actual_Type;
6195 ----------------------------
6196 -- Freeze_Subprogram_Body --
6197 ----------------------------
6199 procedure Freeze_Subprogram_Body
6200 (Inst_Node : Node_Id;
6202 Pack_Id : Entity_Id)
6205 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6206 Par : constant Entity_Id := Scope (Gen_Unit);
6211 function Earlier (N1, N2 : Node_Id) return Boolean;
6212 -- Yields True if N1 and N2 appear in the same compilation unit,
6213 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6214 -- traversal of the tree for the unit.
6216 function Enclosing_Body (N : Node_Id) return Node_Id;
6217 -- Find innermost package body that encloses the given node, and which
6218 -- is not a compilation unit. Freeze nodes for the instance, or for its
6219 -- enclosing body, may be inserted after the enclosing_body of the
6222 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6223 -- Find entity for given package body, and locate or create a freeze
6226 function True_Parent (N : Node_Id) return Node_Id;
6227 -- For a subunit, return parent of corresponding stub
6233 function Earlier (N1, N2 : Node_Id) return Boolean is
6239 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6240 -- Find distance from given node to enclosing compilation unit
6246 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6249 and then Nkind (P) /= N_Compilation_Unit
6251 P := True_Parent (P);
6256 -- Start of procesing for Earlier
6259 Find_Depth (P1, D1);
6260 Find_Depth (P2, D2);
6270 P1 := True_Parent (P1);
6275 P2 := True_Parent (P2);
6279 -- At this point P1 and P2 are at the same distance from the root.
6280 -- We examine their parents until we find a common declarative
6281 -- list, at which point we can establish their relative placement
6282 -- by comparing their ultimate slocs. If we reach the root,
6283 -- N1 and N2 do not descend from the same declarative list (e.g.
6284 -- one is nested in the declarative part and the other is in a block
6285 -- in the statement part) and the earlier one is already frozen.
6287 while not Is_List_Member (P1)
6288 or else not Is_List_Member (P2)
6289 or else List_Containing (P1) /= List_Containing (P2)
6291 P1 := True_Parent (P1);
6292 P2 := True_Parent (P2);
6294 if Nkind (Parent (P1)) = N_Subunit then
6295 P1 := Corresponding_Stub (Parent (P1));
6298 if Nkind (Parent (P2)) = N_Subunit then
6299 P2 := Corresponding_Stub (Parent (P2));
6308 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6311 --------------------
6312 -- Enclosing_Body --
6313 --------------------
6315 function Enclosing_Body (N : Node_Id) return Node_Id is
6316 P : Node_Id := Parent (N);
6320 and then Nkind (Parent (P)) /= N_Compilation_Unit
6322 if Nkind (P) = N_Package_Body then
6324 if Nkind (Parent (P)) = N_Subunit then
6325 return Corresponding_Stub (Parent (P));
6331 P := True_Parent (P);
6337 -------------------------
6338 -- Package_Freeze_Node --
6339 -------------------------
6341 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6345 if Nkind (B) = N_Package_Body then
6346 Id := Corresponding_Spec (B);
6348 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6349 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6352 Ensure_Freeze_Node (Id);
6353 return Freeze_Node (Id);
6354 end Package_Freeze_Node;
6360 function True_Parent (N : Node_Id) return Node_Id is
6362 if Nkind (Parent (N)) = N_Subunit then
6363 return Parent (Corresponding_Stub (Parent (N)));
6369 -- Start of processing of Freeze_Subprogram_Body
6372 -- If the instance and the generic body appear within the same unit, and
6373 -- the instance preceeds the generic, the freeze node for the instance
6374 -- must appear after that of the generic. If the generic is nested
6375 -- within another instance I2, then current instance must be frozen
6376 -- after I2. In both cases, the freeze nodes are those of enclosing
6377 -- packages. Otherwise, the freeze node is placed at the end of the
6378 -- current declarative part.
6380 Enc_G := Enclosing_Body (Gen_Body);
6381 Enc_I := Enclosing_Body (Inst_Node);
6382 Ensure_Freeze_Node (Pack_Id);
6383 F_Node := Freeze_Node (Pack_Id);
6385 if Is_Generic_Instance (Par)
6386 and then Present (Freeze_Node (Par))
6388 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6390 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6392 -- The parent was a premature instantiation. Insert freeze node at
6393 -- the end the current declarative part.
6395 Insert_After_Last_Decl (Inst_Node, F_Node);
6398 Insert_After (Freeze_Node (Par), F_Node);
6401 -- The body enclosing the instance should be frozen after the body that
6402 -- includes the generic, because the body of the instance may make
6403 -- references to entities therein. If the two are not in the same
6404 -- declarative part, or if the one enclosing the instance is frozen
6405 -- already, freeze the instance at the end of the current declarative
6408 elsif Is_Generic_Instance (Par)
6409 and then Present (Freeze_Node (Par))
6410 and then Present (Enc_I)
6412 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6414 (Nkind (Enc_I) = N_Package_Body
6416 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6418 -- The enclosing package may contain several instances. Rather
6419 -- than computing the earliest point at which to insert its
6420 -- freeze node, we place it at the end of the declarative part
6421 -- of the parent of the generic.
6423 Insert_After_Last_Decl
6424 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6427 Insert_After_Last_Decl (Inst_Node, F_Node);
6429 elsif Present (Enc_G)
6430 and then Present (Enc_I)
6431 and then Enc_G /= Enc_I
6432 and then Earlier (Inst_Node, Gen_Body)
6434 if Nkind (Enc_G) = N_Package_Body then
6435 E_G_Id := Corresponding_Spec (Enc_G);
6436 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6438 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6441 -- Freeze package that encloses instance, and place node after
6442 -- package that encloses generic. If enclosing package is already
6443 -- frozen we have to assume it is at the proper place. This may be
6444 -- a potential ABE that requires dynamic checking. Do not add a
6445 -- freeze node if the package that encloses the generic is inside
6446 -- the body that encloses the instance, because the freeze node
6447 -- would be in the wrong scope. Additional contortions needed if
6448 -- the bodies are within a subunit.
6451 Enclosing_Body : Node_Id;
6454 if Nkind (Enc_I) = N_Package_Body_Stub then
6455 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
6457 Enclosing_Body := Enc_I;
6460 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
6461 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
6465 -- Freeze enclosing subunit before instance
6467 Ensure_Freeze_Node (E_G_Id);
6469 if not Is_List_Member (Freeze_Node (E_G_Id)) then
6470 Insert_After (Enc_G, Freeze_Node (E_G_Id));
6473 Insert_After_Last_Decl (Inst_Node, F_Node);
6476 -- If none of the above, insert freeze node at the end of the current
6477 -- declarative part.
6479 Insert_After_Last_Decl (Inst_Node, F_Node);
6481 end Freeze_Subprogram_Body;
6487 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
6489 return Generic_Renamings.Table (E).Gen_Id;
6492 ---------------------
6493 -- Get_Instance_Of --
6494 ---------------------
6496 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
6497 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
6500 if Res /= Assoc_Null then
6501 return Generic_Renamings.Table (Res).Act_Id;
6503 -- On exit, entity is not instantiated: not a generic parameter, or
6504 -- else parameter of an inner generic unit.
6508 end Get_Instance_Of;
6510 ------------------------------------
6511 -- Get_Package_Instantiation_Node --
6512 ------------------------------------
6514 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
6515 Decl : Node_Id := Unit_Declaration_Node (A);
6519 -- If the Package_Instantiation attribute has been set on the package
6520 -- entity, then use it directly when it (or its Original_Node) refers
6521 -- to an N_Package_Instantiation node. In principle it should be
6522 -- possible to have this field set in all cases, which should be
6523 -- investigated, and would allow this function to be significantly
6526 if Present (Package_Instantiation (A)) then
6527 if Nkind (Package_Instantiation (A)) = N_Package_Instantiation then
6528 return Package_Instantiation (A);
6530 elsif Nkind (Original_Node (Package_Instantiation (A))) =
6531 N_Package_Instantiation
6533 return Original_Node (Package_Instantiation (A));
6537 -- If the instantiation is a compilation unit that does not need body
6538 -- then the instantiation node has been rewritten as a package
6539 -- declaration for the instance, and we return the original node.
6541 -- If it is a compilation unit and the instance node has not been
6542 -- rewritten, then it is still the unit of the compilation. Finally, if
6543 -- a body is present, this is a parent of the main unit whose body has
6544 -- been compiled for inlining purposes, and the instantiation node has
6545 -- been rewritten with the instance body.
6547 -- Otherwise the instantiation node appears after the declaration. If
6548 -- the entity is a formal package, the declaration may have been
6549 -- rewritten as a generic declaration (in the case of a formal with box)
6550 -- or left as a formal package declaration if it has actuals, and is
6551 -- found with a forward search.
6553 if Nkind (Parent (Decl)) = N_Compilation_Unit then
6554 if Nkind (Decl) = N_Package_Declaration
6555 and then Present (Corresponding_Body (Decl))
6557 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
6560 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
6561 return Original_Node (Decl);
6563 return Unit (Parent (Decl));
6566 elsif Nkind (Decl) = N_Package_Declaration
6567 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
6569 return Original_Node (Decl);
6572 Inst := Next (Decl);
6573 while not Nkind_In (Inst, N_Package_Instantiation,
6574 N_Formal_Package_Declaration)
6581 end Get_Package_Instantiation_Node;
6583 ------------------------
6584 -- Has_Been_Exchanged --
6585 ------------------------
6587 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
6591 Next := First_Elmt (Exchanged_Views);
6592 while Present (Next) loop
6593 if Full_View (Node (Next)) = E then
6601 end Has_Been_Exchanged;
6607 function Hash (F : Entity_Id) return HTable_Range is
6609 return HTable_Range (F mod HTable_Size);
6612 ------------------------
6613 -- Hide_Current_Scope --
6614 ------------------------
6616 procedure Hide_Current_Scope is
6617 C : constant Entity_Id := Current_Scope;
6621 Set_Is_Hidden_Open_Scope (C);
6623 E := First_Entity (C);
6624 while Present (E) loop
6625 if Is_Immediately_Visible (E) then
6626 Set_Is_Immediately_Visible (E, False);
6627 Append_Elmt (E, Hidden_Entities);
6633 -- Make the scope name invisible as well. This is necessary, but might
6634 -- conflict with calls to Rtsfind later on, in case the scope is a
6635 -- predefined one. There is no clean solution to this problem, so for
6636 -- now we depend on the user not redefining Standard itself in one of
6637 -- the parent units.
6639 if Is_Immediately_Visible (C)
6640 and then C /= Standard_Standard
6642 Set_Is_Immediately_Visible (C, False);
6643 Append_Elmt (C, Hidden_Entities);
6646 end Hide_Current_Scope;
6652 procedure Init_Env is
6653 Saved : Instance_Env;
6656 Saved.Instantiated_Parent := Current_Instantiated_Parent;
6657 Saved.Exchanged_Views := Exchanged_Views;
6658 Saved.Hidden_Entities := Hidden_Entities;
6659 Saved.Current_Sem_Unit := Current_Sem_Unit;
6660 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
6661 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
6663 -- Save configuration switches. These may be reset if the unit is a
6664 -- predefined unit, and the current mode is not Ada 2005.
6666 Save_Opt_Config_Switches (Saved.Switches);
6668 Instance_Envs.Append (Saved);
6670 Exchanged_Views := New_Elmt_List;
6671 Hidden_Entities := New_Elmt_List;
6673 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6674 -- this is set properly in Set_Instance_Env.
6676 Current_Instantiated_Parent :=
6677 (Current_Scope, Current_Scope, Assoc_Null);
6680 ------------------------------
6681 -- In_Same_Declarative_Part --
6682 ------------------------------
6684 function In_Same_Declarative_Part
6686 Inst : Node_Id) return Boolean
6688 Decls : constant Node_Id := Parent (F_Node);
6689 Nod : Node_Id := Parent (Inst);
6692 while Present (Nod) loop
6696 elsif Nkind_In (Nod, N_Subprogram_Body,
6704 elsif Nkind (Nod) = N_Subunit then
6705 Nod := Corresponding_Stub (Nod);
6707 elsif Nkind (Nod) = N_Compilation_Unit then
6711 Nod := Parent (Nod);
6716 end In_Same_Declarative_Part;
6718 ---------------------
6719 -- In_Main_Context --
6720 ---------------------
6722 function In_Main_Context (E : Entity_Id) return Boolean is
6728 if not Is_Compilation_Unit (E)
6729 or else Ekind (E) /= E_Package
6730 or else In_Private_Part (E)
6735 Context := Context_Items (Cunit (Main_Unit));
6737 Clause := First (Context);
6738 while Present (Clause) loop
6739 if Nkind (Clause) = N_With_Clause then
6740 Nam := Name (Clause);
6742 -- If the current scope is part of the context of the main unit,
6743 -- analysis of the corresponding with_clause is not complete, and
6744 -- the entity is not set. We use the Chars field directly, which
6745 -- might produce false positives in rare cases, but guarantees
6746 -- that we produce all the instance bodies we will need.
6748 if (Is_Entity_Name (Nam)
6749 and then Chars (Nam) = Chars (E))
6750 or else (Nkind (Nam) = N_Selected_Component
6751 and then Chars (Selector_Name (Nam)) = Chars (E))
6761 end In_Main_Context;
6763 ---------------------
6764 -- Inherit_Context --
6765 ---------------------
6767 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
6768 Current_Context : List_Id;
6769 Current_Unit : Node_Id;
6774 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
6776 -- The inherited context is attached to the enclosing compilation
6777 -- unit. This is either the main unit, or the declaration for the
6778 -- main unit (in case the instantation appears within the package
6779 -- declaration and the main unit is its body).
6781 Current_Unit := Parent (Inst);
6782 while Present (Current_Unit)
6783 and then Nkind (Current_Unit) /= N_Compilation_Unit
6785 Current_Unit := Parent (Current_Unit);
6788 Current_Context := Context_Items (Current_Unit);
6790 Item := First (Context_Items (Parent (Gen_Decl)));
6791 while Present (Item) loop
6792 if Nkind (Item) = N_With_Clause then
6793 New_I := New_Copy (Item);
6794 Set_Implicit_With (New_I, True);
6795 Append (New_I, Current_Context);
6801 end Inherit_Context;
6807 procedure Initialize is
6809 Generic_Renamings.Init;
6812 Generic_Renamings_HTable.Reset;
6813 Circularity_Detected := False;
6814 Exchanged_Views := No_Elist;
6815 Hidden_Entities := No_Elist;
6818 ----------------------------
6819 -- Insert_After_Last_Decl --
6820 ----------------------------
6822 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
6823 L : List_Id := List_Containing (N);
6824 P : constant Node_Id := Parent (L);
6827 if not Is_List_Member (F_Node) then
6828 if Nkind (P) = N_Package_Specification
6829 and then L = Visible_Declarations (P)
6830 and then Present (Private_Declarations (P))
6831 and then not Is_Empty_List (Private_Declarations (P))
6833 L := Private_Declarations (P);
6836 Insert_After (Last (L), F_Node);
6838 end Insert_After_Last_Decl;
6844 procedure Install_Body
6845 (Act_Body : Node_Id;
6850 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
6851 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
6852 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
6853 Par : constant Entity_Id := Scope (Gen_Id);
6854 Gen_Unit : constant Node_Id :=
6855 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
6856 Orig_Body : Node_Id := Gen_Body;
6858 Body_Unit : Node_Id;
6860 Must_Delay : Boolean;
6862 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
6863 -- Find subprogram (if any) that encloses instance and/or generic body
6865 function True_Sloc (N : Node_Id) return Source_Ptr;
6866 -- If the instance is nested inside a generic unit, the Sloc of the
6867 -- instance indicates the place of the original definition, not the
6868 -- point of the current enclosing instance. Pending a better usage of
6869 -- Slocs to indicate instantiation places, we determine the place of
6870 -- origin of a node by finding the maximum sloc of any ancestor node.
6871 -- Why is this not equivalent to Top_Level_Location ???
6873 --------------------
6874 -- Enclosing_Subp --
6875 --------------------
6877 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
6878 Scop : Entity_Id := Scope (Id);
6881 while Scop /= Standard_Standard
6882 and then not Is_Overloadable (Scop)
6884 Scop := Scope (Scop);
6894 function True_Sloc (N : Node_Id) return Source_Ptr is
6901 while Present (N1) and then N1 /= Act_Unit loop
6902 if Sloc (N1) > Res then
6912 -- Start of processing for Install_Body
6916 -- If the body is a subunit, the freeze point is the corresponding
6917 -- stub in the current compilation, not the subunit itself.
6919 if Nkind (Parent (Gen_Body)) = N_Subunit then
6920 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
6922 Orig_Body := Gen_Body;
6925 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
6927 -- If the instantiation and the generic definition appear in the same
6928 -- package declaration, this is an early instantiation. If they appear
6929 -- in the same declarative part, it is an early instantiation only if
6930 -- the generic body appears textually later, and the generic body is
6931 -- also in the main unit.
6933 -- If instance is nested within a subprogram, and the generic body is
6934 -- not, the instance is delayed because the enclosing body is. If
6935 -- instance and body are within the same scope, or the same sub-
6936 -- program body, indicate explicitly that the instance is delayed.
6939 (Gen_Unit = Act_Unit
6940 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
6941 N_Generic_Package_Declaration)
6942 or else (Gen_Unit = Body_Unit
6943 and then True_Sloc (N) < Sloc (Orig_Body)))
6944 and then Is_In_Main_Unit (Gen_Unit)
6945 and then (Scope (Act_Id) = Scope (Gen_Id)
6947 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
6949 -- If this is an early instantiation, the freeze node is placed after
6950 -- the generic body. Otherwise, if the generic appears in an instance,
6951 -- we cannot freeze the current instance until the outer one is frozen.
6952 -- This is only relevant if the current instance is nested within some
6953 -- inner scope not itself within the outer instance. If this scope is
6954 -- a package body in the same declarative part as the outer instance,
6955 -- then that body needs to be frozen after the outer instance. Finally,
6956 -- if no delay is needed, we place the freeze node at the end of the
6957 -- current declarative part.
6959 if Expander_Active then
6960 Ensure_Freeze_Node (Act_Id);
6961 F_Node := Freeze_Node (Act_Id);
6964 Insert_After (Orig_Body, F_Node);
6966 elsif Is_Generic_Instance (Par)
6967 and then Present (Freeze_Node (Par))
6968 and then Scope (Act_Id) /= Par
6970 -- Freeze instance of inner generic after instance of enclosing
6973 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
6974 Insert_After (Freeze_Node (Par), F_Node);
6976 -- Freeze package enclosing instance of inner generic after
6977 -- instance of enclosing generic.
6979 elsif Nkind (Parent (N)) = N_Package_Body
6980 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
6984 Enclosing : constant Entity_Id :=
6985 Corresponding_Spec (Parent (N));
6988 Insert_After_Last_Decl (N, F_Node);
6989 Ensure_Freeze_Node (Enclosing);
6991 if not Is_List_Member (Freeze_Node (Enclosing)) then
6992 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
6997 Insert_After_Last_Decl (N, F_Node);
7001 Insert_After_Last_Decl (N, F_Node);
7005 Set_Is_Frozen (Act_Id);
7006 Insert_Before (N, Act_Body);
7007 Mark_Rewrite_Insertion (Act_Body);
7010 -----------------------------
7011 -- Install_Formal_Packages --
7012 -----------------------------
7014 procedure Install_Formal_Packages (Par : Entity_Id) is
7018 E := First_Entity (Par);
7019 while Present (E) loop
7020 if Ekind (E) = E_Package
7021 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
7023 -- If this is the renaming for the parent instance, done
7025 if Renamed_Object (E) = Par then
7028 -- The visibility of a formal of an enclosing generic is
7031 elsif Denotes_Formal_Package (E) then
7034 elsif Present (Associated_Formal_Package (E))
7035 and then Box_Present (Parent (Associated_Formal_Package (E)))
7037 Check_Generic_Actuals (Renamed_Object (E), True);
7038 Set_Is_Hidden (E, False);
7044 end Install_Formal_Packages;
7046 --------------------
7047 -- Install_Parent --
7048 --------------------
7050 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
7051 Ancestors : constant Elist_Id := New_Elmt_List;
7052 S : constant Entity_Id := Current_Scope;
7053 Inst_Par : Entity_Id;
7054 First_Par : Entity_Id;
7055 Inst_Node : Node_Id;
7056 Gen_Par : Entity_Id;
7057 First_Gen : Entity_Id;
7060 procedure Install_Noninstance_Specs (Par : Entity_Id);
7061 -- Install the scopes of noninstance parent units ending with Par
7063 procedure Install_Spec (Par : Entity_Id);
7064 -- The child unit is within the declarative part of the parent, so
7065 -- the declarations within the parent are immediately visible.
7067 -------------------------------
7068 -- Install_Noninstance_Specs --
7069 -------------------------------
7071 procedure Install_Noninstance_Specs (Par : Entity_Id) is
7074 and then Par /= Standard_Standard
7075 and then not In_Open_Scopes (Par)
7077 Install_Noninstance_Specs (Scope (Par));
7080 end Install_Noninstance_Specs;
7086 procedure Install_Spec (Par : Entity_Id) is
7087 Spec : constant Node_Id :=
7088 Specification (Unit_Declaration_Node (Par));
7091 -- If this parent of the child instance is a top-level unit,
7092 -- then record the unit and its visibility for later resetting
7093 -- in Remove_Parent. We exclude units that are generic instances,
7094 -- as we only want to record this information for the ultimate
7095 -- top-level noninstance parent (is that always correct???).
7097 if Scope (Par) = Standard_Standard
7098 and then not Is_Generic_Instance (Par)
7100 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7101 Instance_Parent_Unit := Par;
7104 -- Open the parent scope and make it and its declarations visible.
7105 -- If this point is not within a body, then only the visible
7106 -- declarations should be made visible, and installation of the
7107 -- private declarations is deferred until the appropriate point
7108 -- within analysis of the spec being instantiated (see the handling
7109 -- of parent visibility in Analyze_Package_Specification). This is
7110 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7111 -- private view problems that occur when compiling instantiations of
7112 -- a generic child of that package (Generic_Dispatching_Constructor).
7113 -- If the instance freezes a tagged type, inlinings of operations
7114 -- from Ada.Tags may need the full view of type Tag. If inlining took
7115 -- proper account of establishing visibility of inlined subprograms'
7116 -- parents then it should be possible to remove this
7117 -- special check. ???
7120 Set_Is_Immediately_Visible (Par);
7121 Install_Visible_Declarations (Par);
7122 Set_Use (Visible_Declarations (Spec));
7124 if In_Body or else Is_RTU (Par, Ada_Tags) then
7125 Install_Private_Declarations (Par);
7126 Set_Use (Private_Declarations (Spec));
7130 -- Start of processing for Install_Parent
7133 -- We need to install the parent instance to compile the instantiation
7134 -- of the child, but the child instance must appear in the current
7135 -- scope. Given that we cannot place the parent above the current scope
7136 -- in the scope stack, we duplicate the current scope and unstack both
7137 -- after the instantiation is complete.
7139 -- If the parent is itself the instantiation of a child unit, we must
7140 -- also stack the instantiation of its parent, and so on. Each such
7141 -- ancestor is the prefix of the name in a prior instantiation.
7143 -- If this is a nested instance, the parent unit itself resolves to
7144 -- a renaming of the parent instance, whose declaration we need.
7146 -- Finally, the parent may be a generic (not an instance) when the
7147 -- child unit appears as a formal package.
7151 if Present (Renamed_Entity (Inst_Par)) then
7152 Inst_Par := Renamed_Entity (Inst_Par);
7155 First_Par := Inst_Par;
7158 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7160 First_Gen := Gen_Par;
7162 while Present (Gen_Par)
7163 and then Is_Child_Unit (Gen_Par)
7165 -- Load grandparent instance as well
7167 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7169 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7170 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7172 if Present (Renamed_Entity (Inst_Par)) then
7173 Inst_Par := Renamed_Entity (Inst_Par);
7178 (Specification (Unit_Declaration_Node (Inst_Par)));
7180 if Present (Gen_Par) then
7181 Prepend_Elmt (Inst_Par, Ancestors);
7184 -- Parent is not the name of an instantiation
7186 Install_Noninstance_Specs (Inst_Par);
7198 if Present (First_Gen) then
7199 Append_Elmt (First_Par, Ancestors);
7202 Install_Noninstance_Specs (First_Par);
7205 if not Is_Empty_Elmt_List (Ancestors) then
7206 Elmt := First_Elmt (Ancestors);
7208 while Present (Elmt) loop
7209 Install_Spec (Node (Elmt));
7210 Install_Formal_Packages (Node (Elmt));
7221 --------------------------------
7222 -- Instantiate_Formal_Package --
7223 --------------------------------
7225 function Instantiate_Formal_Package
7228 Analyzed_Formal : Node_Id) return List_Id
7230 Loc : constant Source_Ptr := Sloc (Actual);
7231 Actual_Pack : Entity_Id;
7232 Formal_Pack : Entity_Id;
7233 Gen_Parent : Entity_Id;
7236 Parent_Spec : Node_Id;
7238 procedure Find_Matching_Actual
7240 Act : in out Entity_Id);
7241 -- We need to associate each formal entity in the formal package
7242 -- with the corresponding entity in the actual package. The actual
7243 -- package has been analyzed and possibly expanded, and as a result
7244 -- there is no one-to-one correspondence between the two lists (for
7245 -- example, the actual may include subtypes, itypes, and inherited
7246 -- primitive operations, interspersed among the renaming declarations
7247 -- for the actuals) . We retrieve the corresponding actual by name
7248 -- because each actual has the same name as the formal, and they do
7249 -- appear in the same order.
7251 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7252 -- Retrieve entity of defining entity of generic formal parameter.
7253 -- Only the declarations of formals need to be considered when
7254 -- linking them to actuals, but the declarative list may include
7255 -- internal entities generated during analysis, and those are ignored.
7257 procedure Match_Formal_Entity
7258 (Formal_Node : Node_Id;
7259 Formal_Ent : Entity_Id;
7260 Actual_Ent : Entity_Id);
7261 -- Associates the formal entity with the actual. In the case
7262 -- where Formal_Ent is a formal package, this procedure iterates
7263 -- through all of its formals and enters associations betwen the
7264 -- actuals occurring in the formal package's corresponding actual
7265 -- package (given by Actual_Ent) and the formal package's formal
7266 -- parameters. This procedure recurses if any of the parameters is
7267 -- itself a package.
7269 function Is_Instance_Of
7270 (Act_Spec : Entity_Id;
7271 Gen_Anc : Entity_Id) return Boolean;
7272 -- The actual can be an instantiation of a generic within another
7273 -- instance, in which case there is no direct link from it to the
7274 -- original generic ancestor. In that case, we recognize that the
7275 -- ultimate ancestor is the same by examining names and scopes.
7277 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
7278 -- Within the generic part, entities in the formal package are
7279 -- visible. To validate subsequent type declarations, indicate
7280 -- the correspondence betwen the entities in the analyzed formal,
7281 -- and the entities in the actual package. There are three packages
7282 -- involved in the instantiation of a formal package: the parent
7283 -- generic P1 which appears in the generic declaration, the fake
7284 -- instantiation P2 which appears in the analyzed generic, and whose
7285 -- visible entities may be used in subsequent formals, and the actual
7286 -- P3 in the instance. To validate subsequent formals, me indicate
7287 -- that the entities in P2 are mapped into those of P3. The mapping of
7288 -- entities has to be done recursively for nested packages.
7290 procedure Process_Nested_Formal (Formal : Entity_Id);
7291 -- If the current formal is declared with a box, its own formals are
7292 -- visible in the instance, as they were in the generic, and their
7293 -- Hidden flag must be reset. If some of these formals are themselves
7294 -- packages declared with a box, the processing must be recursive.
7296 --------------------------
7297 -- Find_Matching_Actual --
7298 --------------------------
7300 procedure Find_Matching_Actual
7302 Act : in out Entity_Id)
7304 Formal_Ent : Entity_Id;
7307 case Nkind (Original_Node (F)) is
7308 when N_Formal_Object_Declaration |
7309 N_Formal_Type_Declaration =>
7310 Formal_Ent := Defining_Identifier (F);
7312 while Chars (Act) /= Chars (Formal_Ent) loop
7316 when N_Formal_Subprogram_Declaration |
7317 N_Formal_Package_Declaration |
7318 N_Package_Declaration |
7319 N_Generic_Package_Declaration =>
7320 Formal_Ent := Defining_Entity (F);
7322 while Chars (Act) /= Chars (Formal_Ent) loop
7327 raise Program_Error;
7329 end Find_Matching_Actual;
7331 -------------------------
7332 -- Match_Formal_Entity --
7333 -------------------------
7335 procedure Match_Formal_Entity
7336 (Formal_Node : Node_Id;
7337 Formal_Ent : Entity_Id;
7338 Actual_Ent : Entity_Id)
7340 Act_Pkg : Entity_Id;
7343 Set_Instance_Of (Formal_Ent, Actual_Ent);
7345 if Ekind (Actual_Ent) = E_Package then
7347 -- Record associations for each parameter
7349 Act_Pkg := Actual_Ent;
7352 A_Ent : Entity_Id := First_Entity (Act_Pkg);
7361 -- Retrieve the actual given in the formal package declaration
7363 Actual := Entity (Name (Original_Node (Formal_Node)));
7365 -- The actual in the formal package declaration may be a
7366 -- renamed generic package, in which case we want to retrieve
7367 -- the original generic in order to traverse its formal part.
7369 if Present (Renamed_Entity (Actual)) then
7370 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
7372 Gen_Decl := Unit_Declaration_Node (Actual);
7375 Formals := Generic_Formal_Declarations (Gen_Decl);
7377 if Present (Formals) then
7378 F_Node := First_Non_Pragma (Formals);
7383 while Present (A_Ent)
7384 and then Present (F_Node)
7385 and then A_Ent /= First_Private_Entity (Act_Pkg)
7387 F_Ent := Get_Formal_Entity (F_Node);
7389 if Present (F_Ent) then
7391 -- This is a formal of the original package. Record
7392 -- association and recurse.
7394 Find_Matching_Actual (F_Node, A_Ent);
7395 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
7396 Next_Entity (A_Ent);
7399 Next_Non_Pragma (F_Node);
7403 end Match_Formal_Entity;
7405 -----------------------
7406 -- Get_Formal_Entity --
7407 -----------------------
7409 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
7410 Kind : constant Node_Kind := Nkind (Original_Node (N));
7413 when N_Formal_Object_Declaration =>
7414 return Defining_Identifier (N);
7416 when N_Formal_Type_Declaration =>
7417 return Defining_Identifier (N);
7419 when N_Formal_Subprogram_Declaration =>
7420 return Defining_Unit_Name (Specification (N));
7422 when N_Formal_Package_Declaration =>
7423 return Defining_Identifier (Original_Node (N));
7425 when N_Generic_Package_Declaration =>
7426 return Defining_Identifier (Original_Node (N));
7428 -- All other declarations are introduced by semantic analysis and
7429 -- have no match in the actual.
7434 end Get_Formal_Entity;
7436 --------------------
7437 -- Is_Instance_Of --
7438 --------------------
7440 function Is_Instance_Of
7441 (Act_Spec : Entity_Id;
7442 Gen_Anc : Entity_Id) return Boolean
7444 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
7447 if No (Gen_Par) then
7450 -- Simplest case: the generic parent of the actual is the formal
7452 elsif Gen_Par = Gen_Anc then
7455 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
7458 -- The actual may be obtained through several instantiations. Its
7459 -- scope must itself be an instance of a generic declared in the
7460 -- same scope as the formal. Any other case is detected above.
7462 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
7466 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
7474 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
7479 Set_Instance_Of (Form, Act);
7481 -- Traverse formal and actual package to map the corresponding
7482 -- entities. We skip over internal entities that may be generated
7483 -- during semantic analysis, and find the matching entities by
7484 -- name, given that they must appear in the same order.
7486 E1 := First_Entity (Form);
7487 E2 := First_Entity (Act);
7489 and then E1 /= First_Private_Entity (Form)
7491 -- Could this test be a single condition???
7492 -- Seems like it could, and isn't FPE (Form) a constant anyway???
7494 if not Is_Internal (E1)
7495 and then Present (Parent (E1))
7496 and then not Is_Class_Wide_Type (E1)
7497 and then not Is_Internal_Name (Chars (E1))
7500 and then Chars (E2) /= Chars (E1)
7508 Set_Instance_Of (E1, E2);
7511 and then Is_Tagged_Type (E2)
7514 (Class_Wide_Type (E1), Class_Wide_Type (E2));
7517 if Ekind (E1) = E_Package
7518 and then No (Renamed_Object (E1))
7520 Map_Entities (E1, E2);
7529 ---------------------------
7530 -- Process_Nested_Formal --
7531 ---------------------------
7533 procedure Process_Nested_Formal (Formal : Entity_Id) is
7537 if Present (Associated_Formal_Package (Formal))
7538 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
7540 Ent := First_Entity (Formal);
7541 while Present (Ent) loop
7542 Set_Is_Hidden (Ent, False);
7543 Set_Is_Visible_Formal (Ent);
7544 Set_Is_Potentially_Use_Visible
7545 (Ent, Is_Potentially_Use_Visible (Formal));
7547 if Ekind (Ent) = E_Package then
7548 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
7549 Process_Nested_Formal (Ent);
7555 end Process_Nested_Formal;
7557 -- Start of processing for Instantiate_Formal_Package
7562 if not Is_Entity_Name (Actual)
7563 or else Ekind (Entity (Actual)) /= E_Package
7566 ("expect package instance to instantiate formal", Actual);
7567 Abandon_Instantiation (Actual);
7568 raise Program_Error;
7571 Actual_Pack := Entity (Actual);
7572 Set_Is_Instantiated (Actual_Pack);
7574 -- The actual may be a renamed package, or an outer generic formal
7575 -- package whose instantiation is converted into a renaming.
7577 if Present (Renamed_Object (Actual_Pack)) then
7578 Actual_Pack := Renamed_Object (Actual_Pack);
7581 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
7582 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
7583 Formal_Pack := Defining_Identifier (Analyzed_Formal);
7586 Generic_Parent (Specification (Analyzed_Formal));
7588 Defining_Unit_Name (Specification (Analyzed_Formal));
7591 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
7592 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
7594 Parent_Spec := Parent (Actual_Pack);
7597 if Gen_Parent = Any_Id then
7599 ("previous error in declaration of formal package", Actual);
7600 Abandon_Instantiation (Actual);
7603 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
7609 ("actual parameter must be instance of&", Actual, Gen_Parent);
7610 Abandon_Instantiation (Actual);
7613 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
7614 Map_Entities (Formal_Pack, Actual_Pack);
7617 Make_Package_Renaming_Declaration (Loc,
7618 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
7619 Name => New_Reference_To (Actual_Pack, Loc));
7621 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
7622 Defining_Identifier (Formal));
7623 Decls := New_List (Nod);
7625 -- If the formal F has a box, then the generic declarations are
7626 -- visible in the generic G. In an instance of G, the corresponding
7627 -- entities in the actual for F (which are the actuals for the
7628 -- instantiation of the generic that F denotes) must also be made
7629 -- visible for analysis of the current instance. On exit from the
7630 -- current instance, those entities are made private again. If the
7631 -- actual is currently in use, these entities are also use-visible.
7633 -- The loop through the actual entities also steps through the formal
7634 -- entities and enters associations from formals to actuals into the
7635 -- renaming map. This is necessary to properly handle checking of
7636 -- actual parameter associations for later formals that depend on
7637 -- actuals declared in the formal package.
7639 -- In Ada 2005, partial parametrization requires that we make visible
7640 -- the actuals corresponding to formals that were defaulted in the
7641 -- formal package. There formals are identified because they remain
7642 -- formal generics within the formal package, rather than being
7643 -- renamings of the actuals supplied.
7646 Gen_Decl : constant Node_Id :=
7647 Unit_Declaration_Node (Gen_Parent);
7648 Formals : constant List_Id :=
7649 Generic_Formal_Declarations (Gen_Decl);
7651 Actual_Ent : Entity_Id;
7652 Actual_Of_Formal : Node_Id;
7653 Formal_Node : Node_Id;
7654 Formal_Ent : Entity_Id;
7657 if Present (Formals) then
7658 Formal_Node := First_Non_Pragma (Formals);
7660 Formal_Node := Empty;
7663 Actual_Ent := First_Entity (Actual_Pack);
7665 First (Visible_Declarations (Specification (Analyzed_Formal)));
7666 while Present (Actual_Ent)
7667 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7669 if Present (Formal_Node) then
7670 Formal_Ent := Get_Formal_Entity (Formal_Node);
7672 if Present (Formal_Ent) then
7673 Find_Matching_Actual (Formal_Node, Actual_Ent);
7675 (Formal_Node, Formal_Ent, Actual_Ent);
7677 -- We iterate at the same time over the actuals of the
7678 -- local package created for the formal, to determine
7679 -- which one of the formals of the original generic were
7680 -- defaulted in the formal. The corresponding actual
7681 -- entities are visible in the enclosing instance.
7683 if Box_Present (Formal)
7685 (Present (Actual_Of_Formal)
7688 (Get_Formal_Entity (Actual_Of_Formal)))
7690 Set_Is_Hidden (Actual_Ent, False);
7691 Set_Is_Visible_Formal (Actual_Ent);
7692 Set_Is_Potentially_Use_Visible
7693 (Actual_Ent, In_Use (Actual_Pack));
7695 if Ekind (Actual_Ent) = E_Package then
7696 Process_Nested_Formal (Actual_Ent);
7700 Set_Is_Hidden (Actual_Ent);
7701 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
7705 Next_Non_Pragma (Formal_Node);
7706 Next (Actual_Of_Formal);
7709 -- No further formals to match, but the generic part may
7710 -- contain inherited operation that are not hidden in the
7711 -- enclosing instance.
7713 Next_Entity (Actual_Ent);
7717 -- Inherited subprograms generated by formal derived types are
7718 -- also visible if the types are.
7720 Actual_Ent := First_Entity (Actual_Pack);
7721 while Present (Actual_Ent)
7722 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7724 if Is_Overloadable (Actual_Ent)
7726 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
7728 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
7730 Set_Is_Hidden (Actual_Ent, False);
7731 Set_Is_Potentially_Use_Visible
7732 (Actual_Ent, In_Use (Actual_Pack));
7735 Next_Entity (Actual_Ent);
7739 -- If the formal is not declared with a box, reanalyze it as an
7740 -- abbreviated instantiation, to verify the matching rules of 12.7.
7741 -- The actual checks are performed after the generic associations
7742 -- have been analyzed, to guarantee the same visibility for this
7743 -- instantiation and for the actuals.
7745 -- In Ada 2005, the generic associations for the formal can include
7746 -- defaulted parameters. These are ignored during check. This
7747 -- internal instantiation is removed from the tree after conformance
7748 -- checking, because it contains formal declarations for those
7749 -- defaulted parameters, and those should not reach the back-end.
7751 if not Box_Present (Formal) then
7753 I_Pack : constant Entity_Id :=
7754 Make_Defining_Identifier (Sloc (Actual),
7755 Chars => New_Internal_Name ('P'));
7758 Set_Is_Internal (I_Pack);
7761 Make_Package_Instantiation (Sloc (Actual),
7762 Defining_Unit_Name => I_Pack,
7765 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
7766 Generic_Associations =>
7767 Generic_Associations (Formal)));
7773 end Instantiate_Formal_Package;
7775 -----------------------------------
7776 -- Instantiate_Formal_Subprogram --
7777 -----------------------------------
7779 function Instantiate_Formal_Subprogram
7782 Analyzed_Formal : Node_Id) return Node_Id
7785 Formal_Sub : constant Entity_Id :=
7786 Defining_Unit_Name (Specification (Formal));
7787 Analyzed_S : constant Entity_Id :=
7788 Defining_Unit_Name (Specification (Analyzed_Formal));
7789 Decl_Node : Node_Id;
7793 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
7794 -- If the generic is a child unit, the parent has been installed on the
7795 -- scope stack, but a default subprogram cannot resolve to something on
7796 -- the parent because that parent is not really part of the visible
7797 -- context (it is there to resolve explicit local entities). If the
7798 -- default has resolved in this way, we remove the entity from
7799 -- immediate visibility and analyze the node again to emit an error
7800 -- message or find another visible candidate.
7802 procedure Valid_Actual_Subprogram (Act : Node_Id);
7803 -- Perform legality check and raise exception on failure
7805 -----------------------
7806 -- From_Parent_Scope --
7807 -----------------------
7809 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
7810 Gen_Scope : Node_Id;
7813 Gen_Scope := Scope (Analyzed_S);
7814 while Present (Gen_Scope)
7815 and then Is_Child_Unit (Gen_Scope)
7817 if Scope (Subp) = Scope (Gen_Scope) then
7821 Gen_Scope := Scope (Gen_Scope);
7825 end From_Parent_Scope;
7827 -----------------------------
7828 -- Valid_Actual_Subprogram --
7829 -----------------------------
7831 procedure Valid_Actual_Subprogram (Act : Node_Id) is
7835 if Is_Entity_Name (Act) then
7836 Act_E := Entity (Act);
7838 elsif Nkind (Act) = N_Selected_Component
7839 and then Is_Entity_Name (Selector_Name (Act))
7841 Act_E := Entity (Selector_Name (Act));
7847 if (Present (Act_E) and then Is_Overloadable (Act_E))
7848 or else Nkind_In (Act, N_Attribute_Reference,
7849 N_Indexed_Component,
7850 N_Character_Literal,
7851 N_Explicit_Dereference)
7857 ("expect subprogram or entry name in instantiation of&",
7858 Instantiation_Node, Formal_Sub);
7859 Abandon_Instantiation (Instantiation_Node);
7861 end Valid_Actual_Subprogram;
7863 -- Start of processing for Instantiate_Formal_Subprogram
7866 New_Spec := New_Copy_Tree (Specification (Formal));
7868 -- The tree copy has created the proper instantiation sloc for the
7869 -- new specification. Use this location for all other constructed
7872 Loc := Sloc (Defining_Unit_Name (New_Spec));
7874 -- Create new entity for the actual (New_Copy_Tree does not)
7876 Set_Defining_Unit_Name
7877 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7879 -- Create new entities for the each of the formals in the
7880 -- specification of the renaming declaration built for the actual.
7882 if Present (Parameter_Specifications (New_Spec)) then
7886 F := First (Parameter_Specifications (New_Spec));
7887 while Present (F) loop
7888 Set_Defining_Identifier (F,
7889 Make_Defining_Identifier (Sloc (F),
7890 Chars => Chars (Defining_Identifier (F))));
7896 -- Find entity of actual. If the actual is an attribute reference, it
7897 -- cannot be resolved here (its formal is missing) but is handled
7898 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7899 -- fully resolved subsequently, when the renaming declaration for the
7900 -- formal is analyzed. If it is an explicit dereference, resolve the
7901 -- prefix but not the actual itself, to prevent interpretation as call.
7903 if Present (Actual) then
7904 Loc := Sloc (Actual);
7905 Set_Sloc (New_Spec, Loc);
7907 if Nkind (Actual) = N_Operator_Symbol then
7908 Find_Direct_Name (Actual);
7910 elsif Nkind (Actual) = N_Explicit_Dereference then
7911 Analyze (Prefix (Actual));
7913 elsif Nkind (Actual) /= N_Attribute_Reference then
7917 Valid_Actual_Subprogram (Actual);
7920 elsif Present (Default_Name (Formal)) then
7921 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
7922 N_Selected_Component,
7923 N_Indexed_Component,
7924 N_Character_Literal)
7925 and then Present (Entity (Default_Name (Formal)))
7927 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
7929 Nam := New_Copy (Default_Name (Formal));
7930 Set_Sloc (Nam, Loc);
7933 elsif Box_Present (Formal) then
7935 -- Actual is resolved at the point of instantiation. Create an
7936 -- identifier or operator with the same name as the formal.
7938 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
7939 Nam := Make_Operator_Symbol (Loc,
7940 Chars => Chars (Formal_Sub),
7941 Strval => No_String);
7943 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
7946 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
7947 and then Null_Present (Specification (Formal))
7949 -- Generate null body for procedure, for use in the instance
7952 Make_Subprogram_Body (Loc,
7953 Specification => New_Spec,
7954 Declarations => New_List,
7955 Handled_Statement_Sequence =>
7956 Make_Handled_Sequence_Of_Statements (Loc,
7957 Statements => New_List (Make_Null_Statement (Loc))));
7959 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
7963 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
7965 ("missing actual&", Instantiation_Node, Formal_Sub);
7967 ("\in instantiation of & declared#",
7968 Instantiation_Node, Scope (Analyzed_S));
7969 Abandon_Instantiation (Instantiation_Node);
7973 Make_Subprogram_Renaming_Declaration (Loc,
7974 Specification => New_Spec,
7977 -- If we do not have an actual and the formal specified <> then set to
7978 -- get proper default.
7980 if No (Actual) and then Box_Present (Formal) then
7981 Set_From_Default (Decl_Node);
7984 -- Gather possible interpretations for the actual before analyzing the
7985 -- instance. If overloaded, it will be resolved when analyzing the
7986 -- renaming declaration.
7988 if Box_Present (Formal)
7989 and then No (Actual)
7993 if Is_Child_Unit (Scope (Analyzed_S))
7994 and then Present (Entity (Nam))
7996 if not Is_Overloaded (Nam) then
7998 if From_Parent_Scope (Entity (Nam)) then
7999 Set_Is_Immediately_Visible (Entity (Nam), False);
8000 Set_Entity (Nam, Empty);
8001 Set_Etype (Nam, Empty);
8005 Set_Is_Immediately_Visible (Entity (Nam));
8014 Get_First_Interp (Nam, I, It);
8016 while Present (It.Nam) loop
8017 if From_Parent_Scope (It.Nam) then
8021 Get_Next_Interp (I, It);
8028 -- The generic instantiation freezes the actual. This can only be done
8029 -- once the actual is resolved, in the analysis of the renaming
8030 -- declaration. To make the formal subprogram entity available, we set
8031 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8032 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8033 -- of formal abstract subprograms.
8035 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
8037 -- We cannot analyze the renaming declaration, and thus find the actual,
8038 -- until all the actuals are assembled in the instance. For subsequent
8039 -- checks of other actuals, indicate the node that will hold the
8040 -- instance of this formal.
8042 Set_Instance_Of (Analyzed_S, Nam);
8044 if Nkind (Actual) = N_Selected_Component
8045 and then Is_Task_Type (Etype (Prefix (Actual)))
8046 and then not Is_Frozen (Etype (Prefix (Actual)))
8048 -- The renaming declaration will create a body, which must appear
8049 -- outside of the instantiation, We move the renaming declaration
8050 -- out of the instance, and create an additional renaming inside,
8051 -- to prevent freezing anomalies.
8054 Anon_Id : constant Entity_Id :=
8055 Make_Defining_Identifier
8056 (Loc, New_Internal_Name ('E'));
8058 Set_Defining_Unit_Name (New_Spec, Anon_Id);
8059 Insert_Before (Instantiation_Node, Decl_Node);
8060 Analyze (Decl_Node);
8062 -- Now create renaming within the instance
8065 Make_Subprogram_Renaming_Declaration (Loc,
8066 Specification => New_Copy_Tree (New_Spec),
8067 Name => New_Occurrence_Of (Anon_Id, Loc));
8069 Set_Defining_Unit_Name (Specification (Decl_Node),
8070 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8075 end Instantiate_Formal_Subprogram;
8077 ------------------------
8078 -- Instantiate_Object --
8079 ------------------------
8081 function Instantiate_Object
8084 Analyzed_Formal : Node_Id) return List_Id
8086 Acc_Def : Node_Id := Empty;
8087 Act_Assoc : constant Node_Id := Parent (Actual);
8088 Actual_Decl : Node_Id := Empty;
8089 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
8090 Decl_Node : Node_Id;
8093 List : constant List_Id := New_List;
8094 Loc : constant Source_Ptr := Sloc (Actual);
8095 Orig_Ftyp : constant Entity_Id :=
8096 Etype (Defining_Identifier (Analyzed_Formal));
8097 Subt_Decl : Node_Id := Empty;
8098 Subt_Mark : Node_Id := Empty;
8101 if Present (Subtype_Mark (Formal)) then
8102 Subt_Mark := Subtype_Mark (Formal);
8104 Check_Access_Definition (Formal);
8105 Acc_Def := Access_Definition (Formal);
8108 -- Sloc for error message on missing actual
8110 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
8112 if Get_Instance_Of (Formal_Id) /= Formal_Id then
8113 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8116 Set_Parent (List, Parent (Actual));
8120 if Out_Present (Formal) then
8122 -- An IN OUT generic actual must be a name. The instantiation is a
8123 -- renaming declaration. The actual is the name being renamed. We
8124 -- use the actual directly, rather than a copy, because it is not
8125 -- used further in the list of actuals, and because a copy or a use
8126 -- of relocate_node is incorrect if the instance is nested within a
8127 -- generic. In order to simplify ASIS searches, the Generic_Parent
8128 -- field links the declaration to the generic association.
8133 Instantiation_Node, Formal_Id);
8135 ("\in instantiation of & declared#",
8137 Scope (Defining_Identifier (Analyzed_Formal)));
8138 Abandon_Instantiation (Instantiation_Node);
8141 if Present (Subt_Mark) then
8143 Make_Object_Renaming_Declaration (Loc,
8144 Defining_Identifier => New_Copy (Formal_Id),
8145 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8148 else pragma Assert (Present (Acc_Def));
8150 Make_Object_Renaming_Declaration (Loc,
8151 Defining_Identifier => New_Copy (Formal_Id),
8152 Access_Definition => New_Copy_Tree (Acc_Def),
8156 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8158 -- The analysis of the actual may produce insert_action nodes, so
8159 -- the declaration must have a context in which to attach them.
8161 Append (Decl_Node, List);
8164 -- Return if the analysis of the actual reported some error
8166 if Etype (Actual) = Any_Type then
8170 -- This check is performed here because Analyze_Object_Renaming will
8171 -- not check it when Comes_From_Source is False. Note though that the
8172 -- check for the actual being the name of an object will be performed
8173 -- in Analyze_Object_Renaming.
8175 if Is_Object_Reference (Actual)
8176 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8179 ("illegal discriminant-dependent component for in out parameter",
8183 -- The actual has to be resolved in order to check that it is a
8184 -- variable (due to cases such as F(1), where F returns
8185 -- access to an array, and for overloaded prefixes).
8188 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
8190 if Is_Private_Type (Ftyp)
8191 and then not Is_Private_Type (Etype (Actual))
8192 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8193 or else Base_Type (Etype (Actual)) = Ftyp)
8195 -- If the actual has the type of the full view of the formal, or
8196 -- else a non-private subtype of the formal, then the visibility
8197 -- of the formal type has changed. Add to the actuals a subtype
8198 -- declaration that will force the exchange of views in the body
8199 -- of the instance as well.
8202 Make_Subtype_Declaration (Loc,
8203 Defining_Identifier =>
8204 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
8205 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8207 Prepend (Subt_Decl, List);
8209 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8210 Exchange_Declarations (Ftyp);
8213 Resolve (Actual, Ftyp);
8215 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
8217 ("actual for& must be a variable", Actual, Formal_Id);
8219 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8221 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8222 -- the type of the actual shall resolve to a specific anonymous
8225 if Ada_Version < Ada_05
8227 Ekind (Base_Type (Ftyp)) /=
8228 E_Anonymous_Access_Type
8230 Ekind (Base_Type (Etype (Actual))) /=
8231 E_Anonymous_Access_Type
8233 Error_Msg_NE ("type of actual does not match type of&",
8238 Note_Possible_Modification (Actual, Sure => True);
8240 -- Check for instantiation of atomic/volatile actual for
8241 -- non-atomic/volatile formal (RM C.6 (12)).
8243 if Is_Atomic_Object (Actual)
8244 and then not Is_Atomic (Orig_Ftyp)
8247 ("cannot instantiate non-atomic formal object " &
8248 "with atomic actual", Actual);
8250 elsif Is_Volatile_Object (Actual)
8251 and then not Is_Volatile (Orig_Ftyp)
8254 ("cannot instantiate non-volatile formal object " &
8255 "with volatile actual", Actual);
8261 -- The instantiation of a generic formal in-parameter is constant
8262 -- declaration. The actual is the expression for that declaration.
8264 if Present (Actual) then
8265 if Present (Subt_Mark) then
8267 else pragma Assert (Present (Acc_Def));
8272 Make_Object_Declaration (Loc,
8273 Defining_Identifier => New_Copy (Formal_Id),
8274 Constant_Present => True,
8275 Object_Definition => New_Copy_Tree (Def),
8276 Expression => Actual);
8278 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8280 -- A generic formal object of a tagged type is defined to be
8281 -- aliased so the new constant must also be treated as aliased.
8284 (Etype (Defining_Identifier (Analyzed_Formal)))
8286 Set_Aliased_Present (Decl_Node);
8289 Append (Decl_Node, List);
8291 -- No need to repeat (pre-)analysis of some expression nodes
8292 -- already handled in Preanalyze_Actuals.
8294 if Nkind (Actual) /= N_Allocator then
8297 -- Return if the analysis of the actual reported some error
8299 if Etype (Actual) = Any_Type then
8305 Typ : constant Entity_Id :=
8307 (Etype (Defining_Identifier (Analyzed_Formal)));
8310 Freeze_Before (Instantiation_Node, Typ);
8312 -- If the actual is an aggregate, perform name resolution on
8313 -- its components (the analysis of an aggregate does not do it)
8314 -- to capture local names that may be hidden if the generic is
8317 if Nkind (Actual) = N_Aggregate then
8318 Preanalyze_And_Resolve (Actual, Typ);
8321 if Is_Limited_Type (Typ)
8322 and then not OK_For_Limited_Init (Actual)
8325 ("initialization not allowed for limited types", Actual);
8326 Explain_Limited_Type (Typ, Actual);
8330 elsif Present (Default_Expression (Formal)) then
8332 -- Use default to construct declaration
8334 if Present (Subt_Mark) then
8336 else pragma Assert (Present (Acc_Def));
8341 Make_Object_Declaration (Sloc (Formal),
8342 Defining_Identifier => New_Copy (Formal_Id),
8343 Constant_Present => True,
8344 Object_Definition => New_Copy (Def),
8345 Expression => New_Copy_Tree (Default_Expression
8348 Append (Decl_Node, List);
8349 Set_Analyzed (Expression (Decl_Node), False);
8354 Instantiation_Node, Formal_Id);
8355 Error_Msg_NE ("\in instantiation of & declared#",
8357 Scope (Defining_Identifier (Analyzed_Formal)));
8360 (Etype (Defining_Identifier (Analyzed_Formal)))
8362 -- Create dummy constant declaration so that instance can be
8363 -- analyzed, to minimize cascaded visibility errors.
8365 if Present (Subt_Mark) then
8367 else pragma Assert (Present (Acc_Def));
8372 Make_Object_Declaration (Loc,
8373 Defining_Identifier => New_Copy (Formal_Id),
8374 Constant_Present => True,
8375 Object_Definition => New_Copy (Def),
8377 Make_Attribute_Reference (Sloc (Formal_Id),
8378 Attribute_Name => Name_First,
8379 Prefix => New_Copy (Def)));
8381 Append (Decl_Node, List);
8384 Abandon_Instantiation (Instantiation_Node);
8389 if Nkind (Actual) in N_Has_Entity then
8390 Actual_Decl := Parent (Entity (Actual));
8393 -- Ada 2005 (AI-423): For a formal object declaration with a null
8394 -- exclusion or an access definition that has a null exclusion: If the
8395 -- actual matching the formal object declaration denotes a generic
8396 -- formal object of another generic unit G, and the instantiation
8397 -- containing the actual occurs within the body of G or within the body
8398 -- of a generic unit declared within the declarative region of G, then
8399 -- the declaration of the formal object of G must have a null exclusion.
8400 -- Otherwise, the subtype of the actual matching the formal object
8401 -- declaration shall exclude null.
8403 if Ada_Version >= Ada_05
8404 and then Present (Actual_Decl)
8406 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
8407 N_Object_Declaration)
8408 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
8409 and then not Has_Null_Exclusion (Actual_Decl)
8410 and then Has_Null_Exclusion (Analyzed_Formal)
8412 Error_Msg_Sloc := Sloc (Analyzed_Formal);
8414 ("actual must exclude null to match generic formal#", Actual);
8418 end Instantiate_Object;
8420 ------------------------------
8421 -- Instantiate_Package_Body --
8422 ------------------------------
8424 procedure Instantiate_Package_Body
8425 (Body_Info : Pending_Body_Info;
8426 Inlined_Body : Boolean := False;
8427 Body_Optional : Boolean := False)
8429 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8430 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8431 Loc : constant Source_Ptr := Sloc (Inst_Node);
8433 Gen_Id : constant Node_Id := Name (Inst_Node);
8434 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8435 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8436 Act_Spec : constant Node_Id := Specification (Act_Decl);
8437 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
8439 Act_Body_Name : Node_Id;
8441 Gen_Body_Id : Node_Id;
8443 Act_Body_Id : Entity_Id;
8445 Parent_Installed : Boolean := False;
8446 Save_Style_Check : constant Boolean := Style_Check;
8449 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8451 -- The instance body may already have been processed, as the parent of
8452 -- another instance that is inlined (Load_Parent_Of_Generic).
8454 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
8458 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8460 -- Re-establish the state of information on which checks are suppressed.
8461 -- This information was set in Body_Info at the point of instantiation,
8462 -- and now we restore it so that the instance is compiled using the
8463 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8465 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8466 Scope_Suppress := Body_Info.Scope_Suppress;
8468 if No (Gen_Body_Id) then
8469 Load_Parent_Of_Generic
8470 (Inst_Node, Specification (Gen_Decl), Body_Optional);
8471 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8474 -- Establish global variable for sloc adjustment and for error recovery
8476 Instantiation_Node := Inst_Node;
8478 if Present (Gen_Body_Id) then
8479 Save_Env (Gen_Unit, Act_Decl_Id);
8480 Style_Check := False;
8481 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8483 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8485 Create_Instantiation_Source
8486 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
8490 (Original_Node (Gen_Body), Empty, Instantiating => True);
8492 -- Build new name (possibly qualified) for body declaration
8494 Act_Body_Id := New_Copy (Act_Decl_Id);
8496 -- Some attributes of spec entity are not inherited by body entity
8498 Set_Handler_Records (Act_Body_Id, No_List);
8500 if Nkind (Defining_Unit_Name (Act_Spec)) =
8501 N_Defining_Program_Unit_Name
8504 Make_Defining_Program_Unit_Name (Loc,
8505 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
8506 Defining_Identifier => Act_Body_Id);
8508 Act_Body_Name := Act_Body_Id;
8511 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
8513 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
8514 Check_Generic_Actuals (Act_Decl_Id, False);
8516 -- If it is a child unit, make the parent instance (which is an
8517 -- instance of the parent of the generic) visible. The parent
8518 -- instance is the prefix of the name of the generic unit.
8520 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8521 and then Nkind (Gen_Id) = N_Expanded_Name
8523 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8524 Parent_Installed := True;
8526 elsif Is_Child_Unit (Gen_Unit) then
8527 Install_Parent (Scope (Gen_Unit), In_Body => True);
8528 Parent_Installed := True;
8531 -- If the instantiation is a library unit, and this is the main unit,
8532 -- then build the resulting compilation unit nodes for the instance.
8533 -- If this is a compilation unit but it is not the main unit, then it
8534 -- is the body of a unit in the context, that is being compiled
8535 -- because it is encloses some inlined unit or another generic unit
8536 -- being instantiated. In that case, this body is not part of the
8537 -- current compilation, and is not attached to the tree, but its
8538 -- parent must be set for analysis.
8540 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8542 -- Replace instance node with body of instance, and create new
8543 -- node for corresponding instance declaration.
8545 Build_Instance_Compilation_Unit_Nodes
8546 (Inst_Node, Act_Body, Act_Decl);
8547 Analyze (Inst_Node);
8549 if Parent (Inst_Node) = Cunit (Main_Unit) then
8551 -- If the instance is a child unit itself, then set the scope
8552 -- of the expanded body to be the parent of the instantiation
8553 -- (ensuring that the fully qualified name will be generated
8554 -- for the elaboration subprogram).
8556 if Nkind (Defining_Unit_Name (Act_Spec)) =
8557 N_Defining_Program_Unit_Name
8560 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
8564 -- Case where instantiation is not a library unit
8567 -- If this is an early instantiation, i.e. appears textually
8568 -- before the corresponding body and must be elaborated first,
8569 -- indicate that the body instance is to be delayed.
8571 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
8573 -- Now analyze the body. We turn off all checks if this is an
8574 -- internal unit, since there is no reason to have checks on for
8575 -- any predefined run-time library code. All such code is designed
8576 -- to be compiled with checks off.
8578 -- Note that we do NOT apply this criterion to children of GNAT
8579 -- (or on VMS, children of DEC). The latter units must suppress
8580 -- checks explicitly if this is needed.
8582 if Is_Predefined_File_Name
8583 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
8585 Analyze (Act_Body, Suppress => All_Checks);
8591 Inherit_Context (Gen_Body, Inst_Node);
8593 -- Remove the parent instances if they have been placed on the scope
8594 -- stack to compile the body.
8596 if Parent_Installed then
8597 Remove_Parent (In_Body => True);
8600 Restore_Private_Views (Act_Decl_Id);
8602 -- Remove the current unit from visibility if this is an instance
8603 -- that is not elaborated on the fly for inlining purposes.
8605 if not Inlined_Body then
8606 Set_Is_Immediately_Visible (Act_Decl_Id, False);
8610 Style_Check := Save_Style_Check;
8612 -- If we have no body, and the unit requires a body, then complain. This
8613 -- complaint is suppressed if we have detected other errors (since a
8614 -- common reason for missing the body is that it had errors).
8616 elsif Unit_Requires_Body (Gen_Unit)
8617 and then not Body_Optional
8619 if Serious_Errors_Detected = 0 then
8621 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
8623 -- Don't attempt to perform any cleanup actions if some other error
8624 -- was aready detected, since this can cause blowups.
8630 -- Case of package that does not need a body
8633 -- If the instantiation of the declaration is a library unit, rewrite
8634 -- the original package instantiation as a package declaration in the
8635 -- compilation unit node.
8637 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8638 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
8639 Rewrite (Inst_Node, Act_Decl);
8641 -- Generate elaboration entity, in case spec has elaboration code.
8642 -- This cannot be done when the instance is analyzed, because it
8643 -- is not known yet whether the body exists.
8645 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
8646 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
8648 -- If the instantiation is not a library unit, then append the
8649 -- declaration to the list of implicitly generated entities. unless
8650 -- it is already a list member which means that it was already
8653 elsif not Is_List_Member (Act_Decl) then
8654 Mark_Rewrite_Insertion (Act_Decl);
8655 Insert_Before (Inst_Node, Act_Decl);
8659 Expander_Mode_Restore;
8660 end Instantiate_Package_Body;
8662 ---------------------------------
8663 -- Instantiate_Subprogram_Body --
8664 ---------------------------------
8666 procedure Instantiate_Subprogram_Body
8667 (Body_Info : Pending_Body_Info;
8668 Body_Optional : Boolean := False)
8670 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8671 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8672 Loc : constant Source_Ptr := Sloc (Inst_Node);
8673 Gen_Id : constant Node_Id := Name (Inst_Node);
8674 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8675 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8676 Anon_Id : constant Entity_Id :=
8677 Defining_Unit_Name (Specification (Act_Decl));
8678 Pack_Id : constant Entity_Id :=
8679 Defining_Unit_Name (Parent (Act_Decl));
8682 Gen_Body_Id : Node_Id;
8684 Pack_Body : Node_Id;
8685 Prev_Formal : Entity_Id;
8687 Unit_Renaming : Node_Id;
8689 Parent_Installed : Boolean := False;
8690 Save_Style_Check : constant Boolean := Style_Check;
8693 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8695 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8697 -- Re-establish the state of information on which checks are suppressed.
8698 -- This information was set in Body_Info at the point of instantiation,
8699 -- and now we restore it so that the instance is compiled using the
8700 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8702 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8703 Scope_Suppress := Body_Info.Scope_Suppress;
8705 if No (Gen_Body_Id) then
8707 -- For imported generic subprogram, no body to compile, complete
8708 -- the spec entity appropriately.
8710 if Is_Imported (Gen_Unit) then
8711 Set_Is_Imported (Anon_Id);
8712 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
8713 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
8714 Set_Convention (Anon_Id, Convention (Gen_Unit));
8715 Set_Has_Completion (Anon_Id);
8718 -- For other cases, commpile the body
8721 Load_Parent_Of_Generic
8722 (Inst_Node, Specification (Gen_Decl), Body_Optional);
8723 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8727 Instantiation_Node := Inst_Node;
8729 if Present (Gen_Body_Id) then
8730 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8732 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
8734 -- Either body is not present, or context is non-expanding, as
8735 -- when compiling a subunit. Mark the instance as completed, and
8736 -- diagnose a missing body when needed.
8739 and then Operating_Mode = Generate_Code
8742 ("missing proper body for instantiation", Gen_Body);
8745 Set_Has_Completion (Anon_Id);
8749 Save_Env (Gen_Unit, Anon_Id);
8750 Style_Check := False;
8751 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8752 Create_Instantiation_Source
8760 (Original_Node (Gen_Body), Empty, Instantiating => True);
8762 -- Create proper defining name for the body, to correspond to
8763 -- the one in the spec.
8765 Set_Defining_Unit_Name (Specification (Act_Body),
8766 Make_Defining_Identifier
8767 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
8768 Set_Corresponding_Spec (Act_Body, Anon_Id);
8769 Set_Has_Completion (Anon_Id);
8770 Check_Generic_Actuals (Pack_Id, False);
8772 -- Generate a reference to link the visible subprogram instance to
8773 -- the the generic body, which for navigation purposes is the only
8774 -- available source for the instance.
8777 (Related_Instance (Pack_Id),
8778 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
8780 -- If it is a child unit, make the parent instance (which is an
8781 -- instance of the parent of the generic) visible. The parent
8782 -- instance is the prefix of the name of the generic unit.
8784 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8785 and then Nkind (Gen_Id) = N_Expanded_Name
8787 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8788 Parent_Installed := True;
8790 elsif Is_Child_Unit (Gen_Unit) then
8791 Install_Parent (Scope (Gen_Unit), In_Body => True);
8792 Parent_Installed := True;
8795 -- Inside its body, a reference to the generic unit is a reference
8796 -- to the instance. The corresponding renaming is the first
8797 -- declaration in the body.
8800 Make_Subprogram_Renaming_Declaration (Loc,
8803 Specification (Original_Node (Gen_Body)),
8805 Instantiating => True),
8806 Name => New_Occurrence_Of (Anon_Id, Loc));
8808 -- If there is a formal subprogram with the same name as the unit
8809 -- itself, do not add this renaming declaration. This is a temporary
8810 -- fix for one ACVC test. ???
8812 Prev_Formal := First_Entity (Pack_Id);
8813 while Present (Prev_Formal) loop
8814 if Chars (Prev_Formal) = Chars (Gen_Unit)
8815 and then Is_Overloadable (Prev_Formal)
8820 Next_Entity (Prev_Formal);
8823 if Present (Prev_Formal) then
8824 Decls := New_List (Act_Body);
8826 Decls := New_List (Unit_Renaming, Act_Body);
8829 -- The subprogram body is placed in the body of a dummy package body,
8830 -- whose spec contains the subprogram declaration as well as the
8831 -- renaming declarations for the generic parameters.
8833 Pack_Body := Make_Package_Body (Loc,
8834 Defining_Unit_Name => New_Copy (Pack_Id),
8835 Declarations => Decls);
8837 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8839 -- If the instantiation is a library unit, then build resulting
8840 -- compilation unit nodes for the instance. The declaration of
8841 -- the enclosing package is the grandparent of the subprogram
8842 -- declaration. First replace the instantiation node as the unit
8843 -- of the corresponding compilation.
8845 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8846 if Parent (Inst_Node) = Cunit (Main_Unit) then
8847 Set_Unit (Parent (Inst_Node), Inst_Node);
8848 Build_Instance_Compilation_Unit_Nodes
8849 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
8850 Analyze (Inst_Node);
8852 Set_Parent (Pack_Body, Parent (Inst_Node));
8853 Analyze (Pack_Body);
8857 Insert_Before (Inst_Node, Pack_Body);
8858 Mark_Rewrite_Insertion (Pack_Body);
8859 Analyze (Pack_Body);
8861 if Expander_Active then
8862 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
8866 Inherit_Context (Gen_Body, Inst_Node);
8868 Restore_Private_Views (Pack_Id, False);
8870 if Parent_Installed then
8871 Remove_Parent (In_Body => True);
8875 Style_Check := Save_Style_Check;
8877 -- Body not found. Error was emitted already. If there were no previous
8878 -- errors, this may be an instance whose scope is a premature instance.
8879 -- In that case we must insure that the (legal) program does raise
8880 -- program error if executed. We generate a subprogram body for this
8881 -- purpose. See DEC ac30vso.
8883 -- Should not reference proprietary DEC tests in comments ???
8885 elsif Serious_Errors_Detected = 0
8886 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
8888 if Body_Optional then
8891 elsif Ekind (Anon_Id) = E_Procedure then
8893 Make_Subprogram_Body (Loc,
8895 Make_Procedure_Specification (Loc,
8896 Defining_Unit_Name =>
8897 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8898 Parameter_Specifications =>
8900 (Parameter_Specifications (Parent (Anon_Id)))),
8902 Declarations => Empty_List,
8903 Handled_Statement_Sequence =>
8904 Make_Handled_Sequence_Of_Statements (Loc,
8907 Make_Raise_Program_Error (Loc,
8909 PE_Access_Before_Elaboration))));
8913 Make_Raise_Program_Error (Loc,
8914 Reason => PE_Access_Before_Elaboration);
8916 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
8917 Set_Analyzed (Ret_Expr);
8920 Make_Subprogram_Body (Loc,
8922 Make_Function_Specification (Loc,
8923 Defining_Unit_Name =>
8924 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8925 Parameter_Specifications =>
8927 (Parameter_Specifications (Parent (Anon_Id))),
8928 Result_Definition =>
8929 New_Occurrence_Of (Etype (Anon_Id), Loc)),
8931 Declarations => Empty_List,
8932 Handled_Statement_Sequence =>
8933 Make_Handled_Sequence_Of_Statements (Loc,
8936 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
8939 Pack_Body := Make_Package_Body (Loc,
8940 Defining_Unit_Name => New_Copy (Pack_Id),
8941 Declarations => New_List (Act_Body));
8943 Insert_After (Inst_Node, Pack_Body);
8944 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8945 Analyze (Pack_Body);
8948 Expander_Mode_Restore;
8949 end Instantiate_Subprogram_Body;
8951 ----------------------
8952 -- Instantiate_Type --
8953 ----------------------
8955 function Instantiate_Type
8958 Analyzed_Formal : Node_Id;
8959 Actual_Decls : List_Id) return List_Id
8961 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
8962 A_Gen_T : constant Entity_Id :=
8963 Defining_Identifier (Analyzed_Formal);
8964 Ancestor : Entity_Id := Empty;
8965 Def : constant Node_Id := Formal_Type_Definition (Formal);
8967 Decl_Node : Node_Id;
8968 Decl_Nodes : List_Id;
8972 procedure Validate_Array_Type_Instance;
8973 procedure Validate_Access_Subprogram_Instance;
8974 procedure Validate_Access_Type_Instance;
8975 procedure Validate_Derived_Type_Instance;
8976 procedure Validate_Derived_Interface_Type_Instance;
8977 procedure Validate_Interface_Type_Instance;
8978 procedure Validate_Private_Type_Instance;
8979 -- These procedures perform validation tests for the named case
8981 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
8982 -- Check that base types are the same and that the subtypes match
8983 -- statically. Used in several of the above.
8985 --------------------
8986 -- Subtypes_Match --
8987 --------------------
8989 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
8990 T : constant Entity_Id := Get_Instance_Of (Gen_T);
8993 return (Base_Type (T) = Base_Type (Act_T)
8994 and then Subtypes_Statically_Match (T, Act_T))
8996 or else (Is_Class_Wide_Type (Gen_T)
8997 and then Is_Class_Wide_Type (Act_T)
9000 (Get_Instance_Of (Root_Type (Gen_T)),
9004 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
9005 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
9006 and then Ekind (Act_T) = Ekind (Gen_T)
9008 Subtypes_Statically_Match
9009 (Designated_Type (Gen_T), Designated_Type (Act_T)));
9012 -----------------------------------------
9013 -- Validate_Access_Subprogram_Instance --
9014 -----------------------------------------
9016 procedure Validate_Access_Subprogram_Instance is
9018 if not Is_Access_Type (Act_T)
9019 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
9022 ("expect access type in instantiation of &", Actual, Gen_T);
9023 Abandon_Instantiation (Actual);
9026 Check_Mode_Conformant
9027 (Designated_Type (Act_T),
9028 Designated_Type (A_Gen_T),
9032 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
9033 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
9035 ("protected access type not allowed for formal &",
9039 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
9041 ("expect protected access type for formal &",
9044 end Validate_Access_Subprogram_Instance;
9046 -----------------------------------
9047 -- Validate_Access_Type_Instance --
9048 -----------------------------------
9050 procedure Validate_Access_Type_Instance is
9051 Desig_Type : constant Entity_Id :=
9052 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
9053 Desig_Act : Entity_Id;
9056 if not Is_Access_Type (Act_T) then
9058 ("expect access type in instantiation of &", Actual, Gen_T);
9059 Abandon_Instantiation (Actual);
9062 if Is_Access_Constant (A_Gen_T) then
9063 if not Is_Access_Constant (Act_T) then
9065 ("actual type must be access-to-constant type", Actual);
9066 Abandon_Instantiation (Actual);
9069 if Is_Access_Constant (Act_T) then
9071 ("actual type must be access-to-variable type", Actual);
9072 Abandon_Instantiation (Actual);
9074 elsif Ekind (A_Gen_T) = E_General_Access_Type
9075 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
9077 Error_Msg_N ("actual must be general access type!", Actual);
9078 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
9079 Abandon_Instantiation (Actual);
9083 -- The designated subtypes, that is to say the subtypes introduced
9084 -- by an access type declaration (and not by a subtype declaration)
9087 Desig_Act := Designated_Type (Base_Type (Act_T));
9089 -- The designated type may have been introduced through a limited_
9090 -- with clause, in which case retrieve the non-limited view. This
9091 -- applies to incomplete types as well as to class-wide types.
9093 if From_With_Type (Desig_Act) then
9094 Desig_Act := Available_View (Desig_Act);
9097 if not Subtypes_Match
9098 (Desig_Type, Desig_Act) then
9100 ("designated type of actual does not match that of formal &",
9102 Abandon_Instantiation (Actual);
9104 elsif Is_Access_Type (Designated_Type (Act_T))
9105 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
9107 Is_Constrained (Designated_Type (Desig_Type))
9110 ("designated type of actual does not match that of formal &",
9112 Abandon_Instantiation (Actual);
9115 -- Ada 2005: null-exclusion indicators of the two types must agree
9117 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
9119 ("non null exclusion of actual and formal & do not match",
9122 end Validate_Access_Type_Instance;
9124 ----------------------------------
9125 -- Validate_Array_Type_Instance --
9126 ----------------------------------
9128 procedure Validate_Array_Type_Instance is
9133 function Formal_Dimensions return Int;
9134 -- Count number of dimensions in array type formal
9136 -----------------------
9137 -- Formal_Dimensions --
9138 -----------------------
9140 function Formal_Dimensions return Int is
9145 if Nkind (Def) = N_Constrained_Array_Definition then
9146 Index := First (Discrete_Subtype_Definitions (Def));
9148 Index := First (Subtype_Marks (Def));
9151 while Present (Index) loop
9157 end Formal_Dimensions;
9159 -- Start of processing for Validate_Array_Type_Instance
9162 if not Is_Array_Type (Act_T) then
9164 ("expect array type in instantiation of &", Actual, Gen_T);
9165 Abandon_Instantiation (Actual);
9167 elsif Nkind (Def) = N_Constrained_Array_Definition then
9168 if not (Is_Constrained (Act_T)) then
9170 ("expect constrained array in instantiation of &",
9172 Abandon_Instantiation (Actual);
9176 if Is_Constrained (Act_T) then
9178 ("expect unconstrained array in instantiation of &",
9180 Abandon_Instantiation (Actual);
9184 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9186 ("dimensions of actual do not match formal &", Actual, Gen_T);
9187 Abandon_Instantiation (Actual);
9190 I1 := First_Index (A_Gen_T);
9191 I2 := First_Index (Act_T);
9192 for J in 1 .. Formal_Dimensions loop
9194 -- If the indices of the actual were given by a subtype_mark,
9195 -- the index was transformed into a range attribute. Retrieve
9196 -- the original type mark for checking.
9198 if Is_Entity_Name (Original_Node (I2)) then
9199 T2 := Entity (Original_Node (I2));
9204 if not Subtypes_Match
9205 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
9208 ("index types of actual do not match those of formal &",
9210 Abandon_Instantiation (Actual);
9217 if not Subtypes_Match
9218 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
9219 Component_Type (Act_T))
9222 ("component subtype of actual does not match that of formal &",
9224 Abandon_Instantiation (Actual);
9227 if Has_Aliased_Components (A_Gen_T)
9228 and then not Has_Aliased_Components (Act_T)
9231 ("actual must have aliased components to match formal type &",
9234 end Validate_Array_Type_Instance;
9236 -----------------------------------------------
9237 -- Validate_Derived_Interface_Type_Instance --
9238 -----------------------------------------------
9240 procedure Validate_Derived_Interface_Type_Instance is
9241 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9245 -- First apply interface instance checks
9247 Validate_Interface_Type_Instance;
9249 -- Verify that immediate parent interface is an ancestor of
9253 and then not Interface_Present_In_Ancestor (Act_T, Par)
9256 ("interface actual must include progenitor&", Actual, Par);
9259 -- Now verify that the actual includes all other ancestors of
9262 Elmt := First_Elmt (Abstract_Interfaces (A_Gen_T));
9263 while Present (Elmt) loop
9264 if not Interface_Present_In_Ancestor
9265 (Act_T, Get_Instance_Of (Node (Elmt)))
9268 ("interface actual must include progenitor&",
9269 Actual, Node (Elmt));
9274 end Validate_Derived_Interface_Type_Instance;
9276 ------------------------------------
9277 -- Validate_Derived_Type_Instance --
9278 ------------------------------------
9280 procedure Validate_Derived_Type_Instance is
9281 Actual_Discr : Entity_Id;
9282 Ancestor_Discr : Entity_Id;
9285 -- If the parent type in the generic declaration is itself a previous
9286 -- formal type, then it is local to the generic and absent from the
9287 -- analyzed generic definition. In that case the ancestor is the
9288 -- instance of the formal (which must have been instantiated
9289 -- previously), unless the ancestor is itself a formal derived type.
9290 -- In this latter case (which is the subject of Corrigendum 8652/0038
9291 -- (AI-202) the ancestor of the formals is the ancestor of its
9292 -- parent. Otherwise, the analyzed generic carries the parent type.
9293 -- If the parent type is defined in a previous formal package, then
9294 -- the scope of that formal package is that of the generic type
9295 -- itself, and it has already been mapped into the corresponding type
9296 -- in the actual package.
9298 -- Common case: parent type defined outside of the generic
9300 if Is_Entity_Name (Subtype_Mark (Def))
9301 and then Present (Entity (Subtype_Mark (Def)))
9303 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9305 -- Check whether parent is defined in a previous formal package
9308 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9311 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9313 -- The type may be a local derivation, or a type extension of a
9314 -- previous formal, or of a formal of a parent package.
9316 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9318 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9320 -- Check whether the parent is another derived formal type in the
9321 -- same generic unit.
9323 if Etype (A_Gen_T) /= A_Gen_T
9324 and then Is_Generic_Type (Etype (A_Gen_T))
9325 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9326 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9328 -- Locate ancestor of parent from the subtype declaration
9329 -- created for the actual.
9335 Decl := First (Actual_Decls);
9336 while Present (Decl) loop
9337 if Nkind (Decl) = N_Subtype_Declaration
9338 and then Chars (Defining_Identifier (Decl)) =
9339 Chars (Etype (A_Gen_T))
9341 Ancestor := Generic_Parent_Type (Decl);
9349 pragma Assert (Present (Ancestor));
9353 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
9357 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
9360 -- If the formal derived type has pragma Preelaborable_Initialization
9361 -- then the actual type must have preelaborable initialization.
9363 if Known_To_Have_Preelab_Init (A_Gen_T)
9364 and then not Has_Preelaborable_Initialization (Act_T)
9367 ("actual for & must have preelaborable initialization",
9371 -- Ada 2005 (AI-251)
9373 if Ada_Version >= Ada_05
9374 and then Is_Interface (Ancestor)
9376 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
9378 ("(Ada 2005) expected type implementing & in instantiation",
9382 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
9384 ("expect type derived from & in instantiation",
9385 Actual, First_Subtype (Ancestor));
9386 Abandon_Instantiation (Actual);
9389 -- Ada 2005 (AI-443): Synchronized formal derived type ckecks. Note
9390 -- that the formal type declaration has been rewritten as a private
9393 if Ada_Version >= Ada_05
9394 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
9395 and then Synchronized_Present (Parent (A_Gen_T))
9397 -- The actual must be a synchronized tagged type
9399 if not Is_Tagged_Type (Act_T) then
9401 ("actual of synchronized type must be tagged", Actual);
9402 Abandon_Instantiation (Actual);
9404 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
9405 and then Nkind (Type_Definition (Parent (Act_T))) =
9406 N_Derived_Type_Definition
9407 and then not Synchronized_Present (Type_Definition
9411 ("actual of synchronized type must be synchronized", Actual);
9412 Abandon_Instantiation (Actual);
9416 -- Perform atomic/volatile checks (RM C.6(12))
9418 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
9420 ("cannot have atomic actual type for non-atomic formal type",
9423 elsif Is_Volatile (Act_T)
9424 and then not Is_Volatile (Ancestor)
9425 and then Is_By_Reference_Type (Ancestor)
9428 ("cannot have volatile actual type for non-volatile formal type",
9432 -- It should not be necessary to check for unknown discriminants on
9433 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9434 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9435 -- needs fixing. ???
9437 if not Is_Indefinite_Subtype (A_Gen_T)
9438 and then not Unknown_Discriminants_Present (Formal)
9439 and then Is_Indefinite_Subtype (Act_T)
9442 ("actual subtype must be constrained", Actual);
9443 Abandon_Instantiation (Actual);
9446 if not Unknown_Discriminants_Present (Formal) then
9447 if Is_Constrained (Ancestor) then
9448 if not Is_Constrained (Act_T) then
9450 ("actual subtype must be constrained", Actual);
9451 Abandon_Instantiation (Actual);
9454 -- Ancestor is unconstrained, Check if generic formal and actual
9455 -- agree on constrainedness. The check only applies to array types
9456 -- and discriminated types.
9458 elsif Is_Constrained (Act_T) then
9459 if Ekind (Ancestor) = E_Access_Type
9461 (not Is_Constrained (A_Gen_T)
9462 and then Is_Composite_Type (A_Gen_T))
9465 ("actual subtype must be unconstrained", Actual);
9466 Abandon_Instantiation (Actual);
9469 -- A class-wide type is only allowed if the formal has unknown
9472 elsif Is_Class_Wide_Type (Act_T)
9473 and then not Has_Unknown_Discriminants (Ancestor)
9476 ("actual for & cannot be a class-wide type", Actual, Gen_T);
9477 Abandon_Instantiation (Actual);
9479 -- Otherwise, the formal and actual shall have the same number
9480 -- of discriminants and each discriminant of the actual must
9481 -- correspond to a discriminant of the formal.
9483 elsif Has_Discriminants (Act_T)
9484 and then not Has_Unknown_Discriminants (Act_T)
9485 and then Has_Discriminants (Ancestor)
9487 Actual_Discr := First_Discriminant (Act_T);
9488 Ancestor_Discr := First_Discriminant (Ancestor);
9489 while Present (Actual_Discr)
9490 and then Present (Ancestor_Discr)
9492 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
9493 No (Corresponding_Discriminant (Actual_Discr))
9496 ("discriminant & does not correspond " &
9497 "to ancestor discriminant", Actual, Actual_Discr);
9498 Abandon_Instantiation (Actual);
9501 Next_Discriminant (Actual_Discr);
9502 Next_Discriminant (Ancestor_Discr);
9505 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
9507 ("actual for & must have same number of discriminants",
9509 Abandon_Instantiation (Actual);
9512 -- This case should be caught by the earlier check for for
9513 -- constrainedness, but the check here is added for completeness.
9515 elsif Has_Discriminants (Act_T)
9516 and then not Has_Unknown_Discriminants (Act_T)
9519 ("actual for & must not have discriminants", Actual, Gen_T);
9520 Abandon_Instantiation (Actual);
9522 elsif Has_Discriminants (Ancestor) then
9524 ("actual for & must have known discriminants", Actual, Gen_T);
9525 Abandon_Instantiation (Actual);
9528 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
9530 ("constraint on actual is incompatible with formal", Actual);
9531 Abandon_Instantiation (Actual);
9535 -- If the formal and actual types are abstract, check that there
9536 -- are no abstract primitives of the actual type that correspond to
9537 -- nonabstract primitives of the formal type (second sentence of
9540 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
9541 Check_Abstract_Primitives : declare
9542 Gen_Prims : constant Elist_Id :=
9543 Primitive_Operations (A_Gen_T);
9545 Gen_Subp : Entity_Id;
9546 Anc_Subp : Entity_Id;
9547 Anc_Formal : Entity_Id;
9548 Anc_F_Type : Entity_Id;
9550 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
9552 Act_Subp : Entity_Id;
9553 Act_Formal : Entity_Id;
9554 Act_F_Type : Entity_Id;
9556 Subprograms_Correspond : Boolean;
9558 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
9559 -- Returns true if T2 is derived directly or indirectly from
9560 -- T1, including derivations from interfaces. T1 and T2 are
9561 -- required to be specific tagged base types.
9563 ------------------------
9564 -- Is_Tagged_Ancestor --
9565 ------------------------
9567 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
9569 Interfaces : Elist_Id;
9570 Intfc_Elmt : Elmt_Id;
9573 -- The predicate is satisfied if the types are the same
9578 -- If we've reached the top of the derivation chain then
9579 -- we know that T1 is not an ancestor of T2.
9581 elsif Etype (T2) = T2 then
9584 -- Proceed to check T2's immediate parent
9586 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
9589 -- Finally, check to see if T1 is an ancestor of any of T2's
9593 Interfaces := Abstract_Interfaces (T2);
9595 Intfc_Elmt := First_Elmt (Interfaces);
9596 while Present (Intfc_Elmt) loop
9597 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
9601 Next_Elmt (Intfc_Elmt);
9606 end Is_Tagged_Ancestor;
9608 -- Start of processing for Check_Abstract_Primitives
9611 -- Loop over all of the formal derived type's primitives
9613 Gen_Elmt := First_Elmt (Gen_Prims);
9614 while Present (Gen_Elmt) loop
9615 Gen_Subp := Node (Gen_Elmt);
9617 -- If the primitive of the formal is not abstract, then
9618 -- determine whether there is a corresponding primitive of
9619 -- the actual type that's abstract.
9621 if not Is_Abstract_Subprogram (Gen_Subp) then
9622 Act_Elmt := First_Elmt (Act_Prims);
9623 while Present (Act_Elmt) loop
9624 Act_Subp := Node (Act_Elmt);
9626 -- If we find an abstract primitive of the actual,
9627 -- then we need to test whether it corresponds to the
9628 -- subprogram from which the generic formal primitive
9631 if Is_Abstract_Subprogram (Act_Subp) then
9632 Anc_Subp := Alias (Gen_Subp);
9634 -- Test whether we have a corresponding primitive
9635 -- by comparing names, kinds, formal types, and
9638 if Chars (Anc_Subp) = Chars (Act_Subp)
9639 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
9641 Anc_Formal := First_Formal (Anc_Subp);
9642 Act_Formal := First_Formal (Act_Subp);
9643 while Present (Anc_Formal)
9644 and then Present (Act_Formal)
9646 Anc_F_Type := Etype (Anc_Formal);
9647 Act_F_Type := Etype (Act_Formal);
9649 if Ekind (Anc_F_Type)
9650 = E_Anonymous_Access_Type
9652 Anc_F_Type := Designated_Type (Anc_F_Type);
9654 if Ekind (Act_F_Type)
9655 = E_Anonymous_Access_Type
9658 Designated_Type (Act_F_Type);
9664 Ekind (Act_F_Type) = E_Anonymous_Access_Type
9669 Anc_F_Type := Base_Type (Anc_F_Type);
9670 Act_F_Type := Base_Type (Act_F_Type);
9672 -- If the formal is controlling, then the
9673 -- the type of the actual primitive's formal
9674 -- must be derived directly or indirectly
9675 -- from the type of the ancestor primitive's
9678 if Is_Controlling_Formal (Anc_Formal) then
9679 if not Is_Tagged_Ancestor
9680 (Anc_F_Type, Act_F_Type)
9685 -- Otherwise the types of the formals must
9688 elsif Anc_F_Type /= Act_F_Type then
9692 Next_Entity (Anc_Formal);
9693 Next_Entity (Act_Formal);
9696 -- If we traversed through all of the formals
9697 -- then so far the subprograms correspond, so
9698 -- now check that any result types correspond.
9701 and then No (Act_Formal)
9703 Subprograms_Correspond := True;
9705 if Ekind (Act_Subp) = E_Function then
9706 Anc_F_Type := Etype (Anc_Subp);
9707 Act_F_Type := Etype (Act_Subp);
9709 if Ekind (Anc_F_Type)
9710 = E_Anonymous_Access_Type
9713 Designated_Type (Anc_F_Type);
9715 if Ekind (Act_F_Type)
9716 = E_Anonymous_Access_Type
9719 Designated_Type (Act_F_Type);
9721 Subprograms_Correspond := False;
9726 = E_Anonymous_Access_Type
9728 Subprograms_Correspond := False;
9731 Anc_F_Type := Base_Type (Anc_F_Type);
9732 Act_F_Type := Base_Type (Act_F_Type);
9734 -- Now either the result types must be
9735 -- the same or, if the result type is
9736 -- controlling, the result type of the
9737 -- actual primitive must descend from the
9738 -- result type of the ancestor primitive.
9740 if Subprograms_Correspond
9741 and then Anc_F_Type /= Act_F_Type
9743 Has_Controlling_Result (Anc_Subp)
9745 not Is_Tagged_Ancestor
9746 (Anc_F_Type, Act_F_Type)
9748 Subprograms_Correspond := False;
9752 -- Found a matching subprogram belonging to
9753 -- formal ancestor type, so actual subprogram
9754 -- corresponds and this violates 3.9.3(9).
9756 if Subprograms_Correspond then
9758 ("abstract subprogram & overrides " &
9759 "nonabstract subprogram of ancestor",
9767 Next_Elmt (Act_Elmt);
9771 Next_Elmt (Gen_Elmt);
9773 end Check_Abstract_Primitives;
9776 -- Verify that limitedness matches. If parent is a limited
9777 -- interface then the generic formal is not unless declared
9778 -- explicitly so. If not declared limited, the actual cannot be
9779 -- limited (see AI05-0087).
9781 if Is_Limited_Type (Act_T)
9782 and then not Is_Limited_Type (A_Gen_T)
9786 ("actual for non-limited & cannot be a limited type", Actual,
9788 Explain_Limited_Type (Act_T, Actual);
9789 Abandon_Instantiation (Actual);
9791 end Validate_Derived_Type_Instance;
9793 --------------------------------------
9794 -- Validate_Interface_Type_Instance --
9795 --------------------------------------
9797 procedure Validate_Interface_Type_Instance is
9799 if not Is_Interface (Act_T) then
9801 ("actual for formal interface type must be an interface",
9804 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
9806 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
9808 Is_Protected_Interface (A_Gen_T) /=
9809 Is_Protected_Interface (Act_T)
9811 Is_Synchronized_Interface (A_Gen_T) /=
9812 Is_Synchronized_Interface (Act_T)
9815 ("actual for interface& does not match (RM 12.5.5(4))",
9818 end Validate_Interface_Type_Instance;
9820 ------------------------------------
9821 -- Validate_Private_Type_Instance --
9822 ------------------------------------
9824 procedure Validate_Private_Type_Instance is
9825 Formal_Discr : Entity_Id;
9826 Actual_Discr : Entity_Id;
9827 Formal_Subt : Entity_Id;
9830 if Is_Limited_Type (Act_T)
9831 and then not Is_Limited_Type (A_Gen_T)
9834 ("actual for non-limited & cannot be a limited type", Actual,
9836 Explain_Limited_Type (Act_T, Actual);
9837 Abandon_Instantiation (Actual);
9839 elsif Known_To_Have_Preelab_Init (A_Gen_T)
9840 and then not Has_Preelaborable_Initialization (Act_T)
9843 ("actual for & must have preelaborable initialization", Actual,
9846 elsif Is_Indefinite_Subtype (Act_T)
9847 and then not Is_Indefinite_Subtype (A_Gen_T)
9848 and then Ada_Version >= Ada_95
9851 ("actual for & must be a definite subtype", Actual, Gen_T);
9853 elsif not Is_Tagged_Type (Act_T)
9854 and then Is_Tagged_Type (A_Gen_T)
9857 ("actual for & must be a tagged type", Actual, Gen_T);
9859 elsif Has_Discriminants (A_Gen_T) then
9860 if not Has_Discriminants (Act_T) then
9862 ("actual for & must have discriminants", Actual, Gen_T);
9863 Abandon_Instantiation (Actual);
9865 elsif Is_Constrained (Act_T) then
9867 ("actual for & must be unconstrained", Actual, Gen_T);
9868 Abandon_Instantiation (Actual);
9871 Formal_Discr := First_Discriminant (A_Gen_T);
9872 Actual_Discr := First_Discriminant (Act_T);
9873 while Formal_Discr /= Empty loop
9874 if Actual_Discr = Empty then
9876 ("discriminants on actual do not match formal",
9878 Abandon_Instantiation (Actual);
9881 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
9883 -- Access discriminants match if designated types do
9885 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
9886 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
9887 E_Anonymous_Access_Type
9890 (Designated_Type (Base_Type (Formal_Subt))) =
9891 Designated_Type (Base_Type (Etype (Actual_Discr)))
9895 elsif Base_Type (Formal_Subt) /=
9896 Base_Type (Etype (Actual_Discr))
9899 ("types of actual discriminants must match formal",
9901 Abandon_Instantiation (Actual);
9903 elsif not Subtypes_Statically_Match
9904 (Formal_Subt, Etype (Actual_Discr))
9905 and then Ada_Version >= Ada_95
9908 ("subtypes of actual discriminants must match formal",
9910 Abandon_Instantiation (Actual);
9913 Next_Discriminant (Formal_Discr);
9914 Next_Discriminant (Actual_Discr);
9917 if Actual_Discr /= Empty then
9919 ("discriminants on actual do not match formal",
9921 Abandon_Instantiation (Actual);
9928 end Validate_Private_Type_Instance;
9930 -- Start of processing for Instantiate_Type
9933 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
9934 Error_Msg_N ("duplicate instantiation of generic type", Actual);
9935 return New_List (Error);
9937 elsif not Is_Entity_Name (Actual)
9938 or else not Is_Type (Entity (Actual))
9941 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
9942 Abandon_Instantiation (Actual);
9945 Act_T := Entity (Actual);
9947 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
9948 -- as a generic actual parameter if the corresponding formal type
9949 -- does not have a known_discriminant_part, or is a formal derived
9950 -- type that is an Unchecked_Union type.
9952 if Is_Unchecked_Union (Base_Type (Act_T)) then
9953 if not Has_Discriminants (A_Gen_T)
9955 (Is_Derived_Type (A_Gen_T)
9957 Is_Unchecked_Union (A_Gen_T))
9961 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
9962 " discriminated formal type", Act_T);
9967 -- Deal with fixed/floating restrictions
9969 if Is_Floating_Point_Type (Act_T) then
9970 Check_Restriction (No_Floating_Point, Actual);
9971 elsif Is_Fixed_Point_Type (Act_T) then
9972 Check_Restriction (No_Fixed_Point, Actual);
9975 -- Deal with error of using incomplete type as generic actual
9977 if Ekind (Act_T) = E_Incomplete_Type
9978 or else (Is_Class_Wide_Type (Act_T)
9980 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
9982 if Is_Class_Wide_Type (Act_T)
9983 or else No (Underlying_Type (Act_T))
9985 Error_Msg_N ("premature use of incomplete type", Actual);
9986 Abandon_Instantiation (Actual);
9988 Act_T := Full_View (Act_T);
9989 Set_Entity (Actual, Act_T);
9991 if Has_Private_Component (Act_T) then
9993 ("premature use of type with private component", Actual);
9997 -- Deal with error of premature use of private type as generic actual
9999 elsif Is_Private_Type (Act_T)
10000 and then Is_Private_Type (Base_Type (Act_T))
10001 and then not Is_Generic_Type (Act_T)
10002 and then not Is_Derived_Type (Act_T)
10003 and then No (Full_View (Root_Type (Act_T)))
10005 Error_Msg_N ("premature use of private type", Actual);
10007 elsif Has_Private_Component (Act_T) then
10009 ("premature use of type with private component", Actual);
10012 Set_Instance_Of (A_Gen_T, Act_T);
10014 -- If the type is generic, the class-wide type may also be used
10016 if Is_Tagged_Type (A_Gen_T)
10017 and then Is_Tagged_Type (Act_T)
10018 and then not Is_Class_Wide_Type (A_Gen_T)
10020 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
10021 Class_Wide_Type (Act_T));
10024 if not Is_Abstract_Type (A_Gen_T)
10025 and then Is_Abstract_Type (Act_T)
10028 ("actual of non-abstract formal cannot be abstract", Actual);
10031 -- A generic scalar type is a first subtype for which we generate
10032 -- an anonymous base type. Indicate that the instance of this base
10033 -- is the base type of the actual.
10035 if Is_Scalar_Type (A_Gen_T) then
10036 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
10040 if Error_Posted (Act_T) then
10043 case Nkind (Def) is
10044 when N_Formal_Private_Type_Definition =>
10045 Validate_Private_Type_Instance;
10047 when N_Formal_Derived_Type_Definition =>
10048 Validate_Derived_Type_Instance;
10050 when N_Formal_Discrete_Type_Definition =>
10051 if not Is_Discrete_Type (Act_T) then
10053 ("expect discrete type in instantiation of&",
10055 Abandon_Instantiation (Actual);
10058 when N_Formal_Signed_Integer_Type_Definition =>
10059 if not Is_Signed_Integer_Type (Act_T) then
10061 ("expect signed integer type in instantiation of&",
10063 Abandon_Instantiation (Actual);
10066 when N_Formal_Modular_Type_Definition =>
10067 if not Is_Modular_Integer_Type (Act_T) then
10069 ("expect modular type in instantiation of &",
10071 Abandon_Instantiation (Actual);
10074 when N_Formal_Floating_Point_Definition =>
10075 if not Is_Floating_Point_Type (Act_T) then
10077 ("expect float type in instantiation of &", Actual, Gen_T);
10078 Abandon_Instantiation (Actual);
10081 when N_Formal_Ordinary_Fixed_Point_Definition =>
10082 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
10084 ("expect ordinary fixed point type in instantiation of &",
10086 Abandon_Instantiation (Actual);
10089 when N_Formal_Decimal_Fixed_Point_Definition =>
10090 if not Is_Decimal_Fixed_Point_Type (Act_T) then
10092 ("expect decimal type in instantiation of &",
10094 Abandon_Instantiation (Actual);
10097 when N_Array_Type_Definition =>
10098 Validate_Array_Type_Instance;
10100 when N_Access_To_Object_Definition =>
10101 Validate_Access_Type_Instance;
10103 when N_Access_Function_Definition |
10104 N_Access_Procedure_Definition =>
10105 Validate_Access_Subprogram_Instance;
10107 when N_Record_Definition =>
10108 Validate_Interface_Type_Instance;
10110 when N_Derived_Type_Definition =>
10111 Validate_Derived_Interface_Type_Instance;
10114 raise Program_Error;
10119 Subt := New_Copy (Gen_T);
10121 -- Use adjusted sloc of subtype name as the location for other nodes in
10122 -- the subtype declaration.
10124 Loc := Sloc (Subt);
10127 Make_Subtype_Declaration (Loc,
10128 Defining_Identifier => Subt,
10129 Subtype_Indication => New_Reference_To (Act_T, Loc));
10131 if Is_Private_Type (Act_T) then
10132 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10134 elsif Is_Access_Type (Act_T)
10135 and then Is_Private_Type (Designated_Type (Act_T))
10137 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10140 Decl_Nodes := New_List (Decl_Node);
10142 -- Flag actual derived types so their elaboration produces the
10143 -- appropriate renamings for the primitive operations of the ancestor.
10144 -- Flag actual for formal private types as well, to determine whether
10145 -- operations in the private part may override inherited operations.
10146 -- If the formal has an interface list, the ancestor is not the
10147 -- parent, but the analyzed formal that includes the interface
10148 -- operations of all its progenitors.
10150 if Nkind (Def) = N_Formal_Derived_Type_Definition then
10151 if Present (Interface_List (Def)) then
10152 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10154 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10157 elsif Nkind (Def) = N_Formal_Private_Type_Definition then
10158 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10161 -- If the actual is a synchronized type that implements an interface,
10162 -- the primitive operations are attached to the corresponding record,
10163 -- and we have to treat it as an additional generic actual, so that its
10164 -- primitive operations become visible in the instance. The task or
10165 -- protected type itself does not carry primitive operations.
10167 if Is_Concurrent_Type (Act_T)
10168 and then Is_Tagged_Type (Act_T)
10169 and then Present (Corresponding_Record_Type (Act_T))
10170 and then Present (Ancestor)
10171 and then Is_Interface (Ancestor)
10174 Corr_Rec : constant Entity_Id :=
10175 Corresponding_Record_Type (Act_T);
10176 New_Corr : Entity_Id;
10177 Corr_Decl : Node_Id;
10180 New_Corr := Make_Defining_Identifier (Loc,
10181 Chars => New_Internal_Name ('S'));
10183 Make_Subtype_Declaration (Loc,
10184 Defining_Identifier => New_Corr,
10185 Subtype_Indication =>
10186 New_Reference_To (Corr_Rec, Loc));
10187 Append_To (Decl_Nodes, Corr_Decl);
10189 if Ekind (Act_T) = E_Task_Type then
10190 Set_Ekind (Subt, E_Task_Subtype);
10192 Set_Ekind (Subt, E_Protected_Subtype);
10195 Set_Corresponding_Record_Type (Subt, Corr_Rec);
10196 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
10197 Set_Generic_Parent_Type (Decl_Node, Empty);
10202 end Instantiate_Type;
10204 -----------------------
10205 -- Is_Generic_Formal --
10206 -----------------------
10208 function Is_Generic_Formal (E : Entity_Id) return Boolean is
10214 Kind := Nkind (Parent (E));
10216 Nkind_In (Kind, N_Formal_Object_Declaration,
10217 N_Formal_Package_Declaration,
10218 N_Formal_Type_Declaration)
10220 (Is_Formal_Subprogram (E)
10222 Nkind (Parent (Parent (E))) in
10223 N_Formal_Subprogram_Declaration);
10225 end Is_Generic_Formal;
10227 ---------------------
10228 -- Is_In_Main_Unit --
10229 ---------------------
10231 function Is_In_Main_Unit (N : Node_Id) return Boolean is
10232 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
10233 Current_Unit : Node_Id;
10236 if Unum = Main_Unit then
10239 -- If the current unit is a subunit then it is either the main unit or
10240 -- is being compiled as part of the main unit.
10242 elsif Nkind (N) = N_Compilation_Unit then
10243 return Nkind (Unit (N)) = N_Subunit;
10246 Current_Unit := Parent (N);
10247 while Present (Current_Unit)
10248 and then Nkind (Current_Unit) /= N_Compilation_Unit
10250 Current_Unit := Parent (Current_Unit);
10253 -- The instantiation node is in the main unit, or else the current node
10254 -- (perhaps as the result of nested instantiations) is in the main unit,
10255 -- or in the declaration of the main unit, which in this last case must
10258 return Unum = Main_Unit
10259 or else Current_Unit = Cunit (Main_Unit)
10260 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
10261 or else (Present (Library_Unit (Current_Unit))
10262 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
10263 end Is_In_Main_Unit;
10265 ----------------------------
10266 -- Load_Parent_Of_Generic --
10267 ----------------------------
10269 procedure Load_Parent_Of_Generic
10272 Body_Optional : Boolean := False)
10274 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
10275 Save_Style_Check : constant Boolean := Style_Check;
10276 True_Parent : Node_Id;
10277 Inst_Node : Node_Id;
10279 Previous_Instances : constant Elist_Id := New_Elmt_List;
10281 procedure Collect_Previous_Instances (Decls : List_Id);
10282 -- Collect all instantiations in the given list of declarations, that
10283 -- precede the generic that we need to load. If the bodies of these
10284 -- instantiations are available, we must analyze them, to ensure that
10285 -- the public symbols generated are the same when the unit is compiled
10286 -- to generate code, and when it is compiled in the context of a unit
10287 -- that needs a particular nested instance. This process is applied
10288 -- to both package and subprogram instances.
10290 --------------------------------
10291 -- Collect_Previous_Instances --
10292 --------------------------------
10294 procedure Collect_Previous_Instances (Decls : List_Id) is
10298 Decl := First (Decls);
10299 while Present (Decl) loop
10300 if Sloc (Decl) >= Sloc (Inst_Node) then
10303 -- If Decl is an instantiation, then record it as requiring
10304 -- instantiation of the corresponding body, except if it is an
10305 -- abbreviated instantiation generated internally for conformance
10306 -- checking purposes only for the case of a formal package
10307 -- declared without a box (see Instantiate_Formal_Package). Such
10308 -- an instantiation does not generate any code (the actual code
10309 -- comes from actual) and thus does not need to be analyzed here.
10311 elsif Nkind (Decl) = N_Package_Instantiation
10312 and then not Is_Internal (Defining_Entity (Decl))
10314 Append_Elmt (Decl, Previous_Instances);
10316 -- For a subprogram instantiation, omit instantiations of
10317 -- intrinsic operations (Unchecked_Conversions, etc.) that
10320 elsif Nkind_In (Decl, N_Function_Instantiation,
10321 N_Procedure_Instantiation)
10322 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
10324 Append_Elmt (Decl, Previous_Instances);
10326 elsif Nkind (Decl) = N_Package_Declaration then
10327 Collect_Previous_Instances
10328 (Visible_Declarations (Specification (Decl)));
10329 Collect_Previous_Instances
10330 (Private_Declarations (Specification (Decl)));
10332 elsif Nkind (Decl) = N_Package_Body then
10333 Collect_Previous_Instances (Declarations (Decl));
10338 end Collect_Previous_Instances;
10340 -- Start of processing for Load_Parent_Of_Generic
10343 if not In_Same_Source_Unit (N, Spec)
10344 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
10345 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
10346 and then not Is_In_Main_Unit (Spec))
10348 -- Find body of parent of spec, and analyze it. A special case arises
10349 -- when the parent is an instantiation, that is to say when we are
10350 -- currently instantiating a nested generic. In that case, there is
10351 -- no separate file for the body of the enclosing instance. Instead,
10352 -- the enclosing body must be instantiated as if it were a pending
10353 -- instantiation, in order to produce the body for the nested generic
10354 -- we require now. Note that in that case the generic may be defined
10355 -- in a package body, the instance defined in the same package body,
10356 -- and the original enclosing body may not be in the main unit.
10358 Inst_Node := Empty;
10360 True_Parent := Parent (Spec);
10361 while Present (True_Parent)
10362 and then Nkind (True_Parent) /= N_Compilation_Unit
10364 if Nkind (True_Parent) = N_Package_Declaration
10366 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
10368 -- Parent is a compilation unit that is an instantiation.
10369 -- Instantiation node has been replaced with package decl.
10371 Inst_Node := Original_Node (True_Parent);
10374 elsif Nkind (True_Parent) = N_Package_Declaration
10375 and then Present (Generic_Parent (Specification (True_Parent)))
10376 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10378 -- Parent is an instantiation within another specification.
10379 -- Declaration for instance has been inserted before original
10380 -- instantiation node. A direct link would be preferable?
10382 Inst_Node := Next (True_Parent);
10383 while Present (Inst_Node)
10384 and then Nkind (Inst_Node) /= N_Package_Instantiation
10389 -- If the instance appears within a generic, and the generic
10390 -- unit is defined within a formal package of the enclosing
10391 -- generic, there is no generic body available, and none
10392 -- needed. A more precise test should be used ???
10394 if No (Inst_Node) then
10401 True_Parent := Parent (True_Parent);
10405 -- Case where we are currently instantiating a nested generic
10407 if Present (Inst_Node) then
10408 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
10410 -- Instantiation node and declaration of instantiated package
10411 -- were exchanged when only the declaration was needed.
10412 -- Restore instantiation node before proceeding with body.
10414 Set_Unit (Parent (True_Parent), Inst_Node);
10417 -- Now complete instantiation of enclosing body, if it appears
10418 -- in some other unit. If it appears in the current unit, the
10419 -- body will have been instantiated already.
10421 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
10423 -- We need to determine the expander mode to instantiate the
10424 -- enclosing body. Because the generic body we need may use
10425 -- global entities declared in the enclosing package (including
10426 -- aggregates) it is in general necessary to compile this body
10427 -- with expansion enabled. The exception is if we are within a
10428 -- generic package, in which case the usual generic rule
10432 Exp_Status : Boolean := True;
10436 -- Loop through scopes looking for generic package
10438 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
10439 while Present (Scop)
10440 and then Scop /= Standard_Standard
10442 if Ekind (Scop) = E_Generic_Package then
10443 Exp_Status := False;
10447 Scop := Scope (Scop);
10450 -- Collect previous instantiations in the unit that
10451 -- contains the desired generic.
10453 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10454 and then not Body_Optional
10458 Info : Pending_Body_Info;
10462 Par := Parent (Inst_Node);
10463 while Present (Par) loop
10464 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
10465 Par := Parent (Par);
10468 pragma Assert (Present (Par));
10470 if Nkind (Par) = N_Package_Body then
10471 Collect_Previous_Instances (Declarations (Par));
10473 elsif Nkind (Par) = N_Package_Declaration then
10474 Collect_Previous_Instances
10475 (Visible_Declarations (Specification (Par)));
10476 Collect_Previous_Instances
10477 (Private_Declarations (Specification (Par)));
10480 -- Enclosing unit is a subprogram body, In this
10481 -- case all instance bodies are processed in order
10482 -- and there is no need to collect them separately.
10487 Decl := First_Elmt (Previous_Instances);
10488 while Present (Decl) loop
10490 (Inst_Node => Node (Decl),
10492 Instance_Spec (Node (Decl)),
10493 Expander_Status => Exp_Status,
10494 Current_Sem_Unit =>
10495 Get_Code_Unit (Sloc (Node (Decl))),
10496 Scope_Suppress => Scope_Suppress,
10497 Local_Suppress_Stack_Top =>
10498 Local_Suppress_Stack_Top);
10500 -- Package instance
10503 Nkind (Node (Decl)) = N_Package_Instantiation
10505 Instantiate_Package_Body
10506 (Info, Body_Optional => True);
10508 -- Subprogram instance
10511 -- The instance_spec is the wrapper package,
10512 -- and the subprogram declaration is the last
10513 -- declaration in the wrapper.
10517 (Visible_Declarations
10518 (Specification (Info.Act_Decl)));
10520 Instantiate_Subprogram_Body
10521 (Info, Body_Optional => True);
10529 Instantiate_Package_Body
10531 ((Inst_Node => Inst_Node,
10532 Act_Decl => True_Parent,
10533 Expander_Status => Exp_Status,
10534 Current_Sem_Unit =>
10535 Get_Code_Unit (Sloc (Inst_Node)),
10536 Scope_Suppress => Scope_Suppress,
10537 Local_Suppress_Stack_Top =>
10538 Local_Suppress_Stack_Top)),
10539 Body_Optional => Body_Optional);
10543 -- Case where we are not instantiating a nested generic
10546 Opt.Style_Check := False;
10547 Expander_Mode_Save_And_Set (True);
10548 Load_Needed_Body (Comp_Unit, OK);
10549 Opt.Style_Check := Save_Style_Check;
10550 Expander_Mode_Restore;
10553 and then Unit_Requires_Body (Defining_Entity (Spec))
10554 and then not Body_Optional
10557 Bname : constant Unit_Name_Type :=
10558 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
10561 Error_Msg_Unit_1 := Bname;
10562 Error_Msg_N ("this instantiation requires$!", N);
10563 Error_Msg_File_1 := Get_File_Name (Bname, Subunit => False);
10564 Error_Msg_N ("\but file{ was not found!", N);
10565 raise Unrecoverable_Error;
10571 -- If loading parent of the generic caused an instantiation circularity,
10572 -- we abandon compilation at this point, because otherwise in some cases
10573 -- we get into trouble with infinite recursions after this point.
10575 if Circularity_Detected then
10576 raise Unrecoverable_Error;
10578 end Load_Parent_Of_Generic;
10580 -----------------------
10581 -- Move_Freeze_Nodes --
10582 -----------------------
10584 procedure Move_Freeze_Nodes
10585 (Out_Of : Entity_Id;
10590 Next_Decl : Node_Id;
10591 Next_Node : Node_Id := After;
10594 function Is_Outer_Type (T : Entity_Id) return Boolean;
10595 -- Check whether entity is declared in a scope external to that
10596 -- of the generic unit.
10598 -------------------
10599 -- Is_Outer_Type --
10600 -------------------
10602 function Is_Outer_Type (T : Entity_Id) return Boolean is
10603 Scop : Entity_Id := Scope (T);
10606 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
10610 while Scop /= Standard_Standard loop
10611 if Scop = Out_Of then
10614 Scop := Scope (Scop);
10622 -- Start of processing for Move_Freeze_Nodes
10629 -- First remove the freeze nodes that may appear before all other
10633 while Present (Decl)
10634 and then Nkind (Decl) = N_Freeze_Entity
10635 and then Is_Outer_Type (Entity (Decl))
10637 Decl := Remove_Head (L);
10638 Insert_After (Next_Node, Decl);
10639 Set_Analyzed (Decl, False);
10644 -- Next scan the list of declarations and remove each freeze node that
10645 -- appears ahead of the current node.
10647 while Present (Decl) loop
10648 while Present (Next (Decl))
10649 and then Nkind (Next (Decl)) = N_Freeze_Entity
10650 and then Is_Outer_Type (Entity (Next (Decl)))
10652 Next_Decl := Remove_Next (Decl);
10653 Insert_After (Next_Node, Next_Decl);
10654 Set_Analyzed (Next_Decl, False);
10655 Next_Node := Next_Decl;
10658 -- If the declaration is a nested package or concurrent type, then
10659 -- recurse. Nested generic packages will have been processed from the
10662 if Nkind (Decl) = N_Package_Declaration then
10663 Spec := Specification (Decl);
10665 elsif Nkind (Decl) = N_Task_Type_Declaration then
10666 Spec := Task_Definition (Decl);
10668 elsif Nkind (Decl) = N_Protected_Type_Declaration then
10669 Spec := Protected_Definition (Decl);
10675 if Present (Spec) then
10676 Move_Freeze_Nodes (Out_Of, Next_Node,
10677 Visible_Declarations (Spec));
10678 Move_Freeze_Nodes (Out_Of, Next_Node,
10679 Private_Declarations (Spec));
10684 end Move_Freeze_Nodes;
10690 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
10692 return Generic_Renamings.Table (E).Next_In_HTable;
10695 ------------------------
10696 -- Preanalyze_Actuals --
10697 ------------------------
10699 procedure Preanalyze_Actuals (N : Node_Id) is
10702 Errs : constant Int := Serious_Errors_Detected;
10705 Assoc := First (Generic_Associations (N));
10706 while Present (Assoc) loop
10707 if Nkind (Assoc) /= N_Others_Choice then
10708 Act := Explicit_Generic_Actual_Parameter (Assoc);
10710 -- Within a nested instantiation, a defaulted actual is an empty
10711 -- association, so nothing to analyze. If the subprogram actual
10712 -- isan attribute, analyze prefix only, because actual is not a
10713 -- complete attribute reference.
10715 -- If actual is an allocator, analyze expression only. The full
10716 -- analysis can generate code, and if instance is a compilation
10717 -- unit we have to wait until the package instance is installed
10718 -- to have a proper place to insert this code.
10720 -- String literals may be operators, but at this point we do not
10721 -- know whether the actual is a formal subprogram or a string.
10726 elsif Nkind (Act) = N_Attribute_Reference then
10727 Analyze (Prefix (Act));
10729 elsif Nkind (Act) = N_Explicit_Dereference then
10730 Analyze (Prefix (Act));
10732 elsif Nkind (Act) = N_Allocator then
10734 Expr : constant Node_Id := Expression (Act);
10737 if Nkind (Expr) = N_Subtype_Indication then
10738 Analyze (Subtype_Mark (Expr));
10740 -- Analyze separately each discriminant constraint,
10741 -- when given with a named association.
10747 Constr := First (Constraints (Constraint (Expr)));
10748 while Present (Constr) loop
10749 if Nkind (Constr) = N_Discriminant_Association then
10750 Analyze (Expression (Constr));
10764 elsif Nkind (Act) /= N_Operator_Symbol then
10768 if Errs /= Serious_Errors_Detected then
10770 -- Do a minimal analysis of the generic, to prevent spurious
10771 -- warnings complaining about the generic being unreferenced,
10772 -- before abandoning the instantiation.
10774 Analyze (Name (N));
10776 if Is_Entity_Name (Name (N))
10777 and then Etype (Name (N)) /= Any_Type
10779 Generate_Reference (Entity (Name (N)), Name (N));
10780 Set_Is_Instantiated (Entity (Name (N)));
10783 Abandon_Instantiation (Act);
10789 end Preanalyze_Actuals;
10791 -------------------
10792 -- Remove_Parent --
10793 -------------------
10795 procedure Remove_Parent (In_Body : Boolean := False) is
10796 S : Entity_Id := Current_Scope;
10802 -- After child instantiation is complete, remove from scope stack the
10803 -- extra copy of the current scope, and then remove parent instances.
10805 if not In_Body then
10808 while Current_Scope /= S loop
10809 P := Current_Scope;
10810 End_Package_Scope (Current_Scope);
10812 if In_Open_Scopes (P) then
10813 E := First_Entity (P);
10815 while Present (E) loop
10816 Set_Is_Immediately_Visible (E, True);
10820 if Is_Generic_Instance (Current_Scope)
10821 and then P /= Current_Scope
10823 -- We are within an instance of some sibling. Retain
10824 -- visibility of parent, for proper subsequent cleanup,
10825 -- and reinstall private declarations as well.
10827 Set_In_Private_Part (P);
10828 Install_Private_Declarations (P);
10831 -- If the ultimate parent is a top-level unit recorded in
10832 -- Instance_Parent_Unit, then reset its visibility to what
10833 -- it was before instantiation. (It's not clear what the
10834 -- purpose is of testing whether Scope (P) is In_Open_Scopes,
10835 -- but that test was present before the ultimate parent test
10838 elsif not In_Open_Scopes (Scope (P))
10839 or else (P = Instance_Parent_Unit
10840 and then not Parent_Unit_Visible)
10842 Set_Is_Immediately_Visible (P, False);
10846 -- Reset visibility of entities in the enclosing scope
10848 Set_Is_Hidden_Open_Scope (Current_Scope, False);
10849 Hidden := First_Elmt (Hidden_Entities);
10851 while Present (Hidden) loop
10852 Set_Is_Immediately_Visible (Node (Hidden), True);
10853 Next_Elmt (Hidden);
10857 -- Each body is analyzed separately, and there is no context
10858 -- that needs preserving from one body instance to the next,
10859 -- so remove all parent scopes that have been installed.
10861 while Present (S) loop
10862 End_Package_Scope (S);
10863 Set_Is_Immediately_Visible (S, False);
10864 S := Current_Scope;
10865 exit when S = Standard_Standard;
10874 procedure Restore_Env is
10875 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
10878 if No (Current_Instantiated_Parent.Act_Id) then
10880 -- Restore environment after subprogram inlining
10882 Restore_Private_Views (Empty);
10885 Current_Instantiated_Parent := Saved.Instantiated_Parent;
10886 Exchanged_Views := Saved.Exchanged_Views;
10887 Hidden_Entities := Saved.Hidden_Entities;
10888 Current_Sem_Unit := Saved.Current_Sem_Unit;
10889 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
10890 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
10892 Restore_Opt_Config_Switches (Saved.Switches);
10894 Instance_Envs.Decrement_Last;
10897 ---------------------------
10898 -- Restore_Private_Views --
10899 ---------------------------
10901 procedure Restore_Private_Views
10902 (Pack_Id : Entity_Id;
10903 Is_Package : Boolean := True)
10908 Dep_Elmt : Elmt_Id;
10911 procedure Restore_Nested_Formal (Formal : Entity_Id);
10912 -- Hide the generic formals of formal packages declared with box
10913 -- which were reachable in the current instantiation.
10915 ---------------------------
10916 -- Restore_Nested_Formal --
10917 ---------------------------
10919 procedure Restore_Nested_Formal (Formal : Entity_Id) is
10923 if Present (Renamed_Object (Formal))
10924 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
10928 elsif Present (Associated_Formal_Package (Formal)) then
10929 Ent := First_Entity (Formal);
10930 while Present (Ent) loop
10931 exit when Ekind (Ent) = E_Package
10932 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
10934 Set_Is_Hidden (Ent);
10935 Set_Is_Potentially_Use_Visible (Ent, False);
10937 -- If package, then recurse
10939 if Ekind (Ent) = E_Package then
10940 Restore_Nested_Formal (Ent);
10946 end Restore_Nested_Formal;
10948 -- Start of processing for Restore_Private_Views
10951 M := First_Elmt (Exchanged_Views);
10952 while Present (M) loop
10955 -- Subtypes of types whose views have been exchanged, and that
10956 -- are defined within the instance, were not on the list of
10957 -- Private_Dependents on entry to the instance, so they have to
10958 -- be exchanged explicitly now, in order to remain consistent with
10959 -- the view of the parent type.
10961 if Ekind (Typ) = E_Private_Type
10962 or else Ekind (Typ) = E_Limited_Private_Type
10963 or else Ekind (Typ) = E_Record_Type_With_Private
10965 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
10966 while Present (Dep_Elmt) loop
10967 Dep_Typ := Node (Dep_Elmt);
10969 if Scope (Dep_Typ) = Pack_Id
10970 and then Present (Full_View (Dep_Typ))
10972 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
10973 Exchange_Declarations (Dep_Typ);
10976 Next_Elmt (Dep_Elmt);
10980 Exchange_Declarations (Node (M));
10984 if No (Pack_Id) then
10988 -- Make the generic formal parameters private, and make the formal
10989 -- types into subtypes of the actuals again.
10991 E := First_Entity (Pack_Id);
10992 while Present (E) loop
10993 Set_Is_Hidden (E, True);
10996 and then Nkind (Parent (E)) = N_Subtype_Declaration
10998 Set_Is_Generic_Actual_Type (E, False);
11000 -- An unusual case of aliasing: the actual may also be directly
11001 -- visible in the generic, and be private there, while it is fully
11002 -- visible in the context of the instance. The internal subtype
11003 -- is private in the instance, but has full visibility like its
11004 -- parent in the enclosing scope. This enforces the invariant that
11005 -- the privacy status of all private dependents of a type coincide
11006 -- with that of the parent type. This can only happen when a
11007 -- generic child unit is instantiated within sibling.
11009 if Is_Private_Type (E)
11010 and then not Is_Private_Type (Etype (E))
11012 Exchange_Declarations (E);
11015 elsif Ekind (E) = E_Package then
11017 -- The end of the renaming list is the renaming of the generic
11018 -- package itself. If the instance is a subprogram, all entities
11019 -- in the corresponding package are renamings. If this entity is
11020 -- a formal package, make its own formals private as well. The
11021 -- actual in this case is itself the renaming of an instantation.
11022 -- If the entity is not a package renaming, it is the entity
11023 -- created to validate formal package actuals: ignore.
11025 -- If the actual is itself a formal package for the enclosing
11026 -- generic, or the actual for such a formal package, it remains
11027 -- visible on exit from the instance, and therefore nothing needs
11028 -- to be done either, except to keep it accessible.
11031 and then Renamed_Object (E) = Pack_Id
11035 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
11038 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
11039 Set_Is_Hidden (E, False);
11043 Act_P : constant Entity_Id := Renamed_Object (E);
11047 Id := First_Entity (Act_P);
11049 and then Id /= First_Private_Entity (Act_P)
11051 exit when Ekind (Id) = E_Package
11052 and then Renamed_Object (Id) = Act_P;
11054 Set_Is_Hidden (Id, True);
11055 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
11057 if Ekind (Id) = E_Package then
11058 Restore_Nested_Formal (Id);
11069 end Restore_Private_Views;
11076 (Gen_Unit : Entity_Id;
11077 Act_Unit : Entity_Id)
11081 Set_Instance_Env (Gen_Unit, Act_Unit);
11084 ----------------------------
11085 -- Save_Global_References --
11086 ----------------------------
11088 procedure Save_Global_References (N : Node_Id) is
11089 Gen_Scope : Entity_Id;
11093 function Is_Global (E : Entity_Id) return Boolean;
11094 -- Check whether entity is defined outside of generic unit. Examine the
11095 -- scope of an entity, and the scope of the scope, etc, until we find
11096 -- either Standard, in which case the entity is global, or the generic
11097 -- unit itself, which indicates that the entity is local. If the entity
11098 -- is the generic unit itself, as in the case of a recursive call, or
11099 -- the enclosing generic unit, if different from the current scope, then
11100 -- it is local as well, because it will be replaced at the point of
11101 -- instantiation. On the other hand, if it is a reference to a child
11102 -- unit of a common ancestor, which appears in an instantiation, it is
11103 -- global because it is used to denote a specific compilation unit at
11104 -- the time the instantiations will be analyzed.
11106 procedure Reset_Entity (N : Node_Id);
11107 -- Save semantic information on global entity, so that it is not
11108 -- resolved again at instantiation time.
11110 procedure Save_Entity_Descendants (N : Node_Id);
11111 -- Apply Save_Global_References to the two syntactic descendants of
11112 -- non-terminal nodes that carry an Associated_Node and are processed
11113 -- through Reset_Entity. Once the global entity (if any) has been
11114 -- captured together with its type, only two syntactic descendants need
11115 -- to be traversed to complete the processing of the tree rooted at N.
11116 -- This applies to Selected_Components, Expanded_Names, and to Operator
11117 -- nodes. N can also be a character literal, identifier, or operator
11118 -- symbol node, but the call has no effect in these cases.
11120 procedure Save_Global_Defaults (N1, N2 : Node_Id);
11121 -- Default actuals in nested instances must be handled specially
11122 -- because there is no link to them from the original tree. When an
11123 -- actual subprogram is given by a default, we add an explicit generic
11124 -- association for it in the instantiation node. When we save the
11125 -- global references on the name of the instance, we recover the list
11126 -- of generic associations, and add an explicit one to the original
11127 -- generic tree, through which a global actual can be preserved.
11128 -- Similarly, if a child unit is instantiated within a sibling, in the
11129 -- context of the parent, we must preserve the identifier of the parent
11130 -- so that it can be properly resolved in a subsequent instantiation.
11132 procedure Save_Global_Descendant (D : Union_Id);
11133 -- Apply Save_Global_References recursively to the descendents of the
11136 procedure Save_References (N : Node_Id);
11137 -- This is the recursive procedure that does the work, once the
11138 -- enclosing generic scope has been established.
11144 function Is_Global (E : Entity_Id) return Boolean is
11147 function Is_Instance_Node (Decl : Node_Id) return Boolean;
11148 -- Determine whether the parent node of a reference to a child unit
11149 -- denotes an instantiation or a formal package, in which case the
11150 -- reference to the child unit is global, even if it appears within
11151 -- the current scope (e.g. when the instance appears within the body
11152 -- of an ancestor).
11154 ----------------------
11155 -- Is_Instance_Node --
11156 ----------------------
11158 function Is_Instance_Node (Decl : Node_Id) return Boolean is
11160 return (Nkind (Decl) in N_Generic_Instantiation
11162 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
11163 end Is_Instance_Node;
11165 -- Start of processing for Is_Global
11168 if E = Gen_Scope then
11171 elsif E = Standard_Standard then
11174 elsif Is_Child_Unit (E)
11175 and then (Is_Instance_Node (Parent (N2))
11176 or else (Nkind (Parent (N2)) = N_Expanded_Name
11177 and then N2 = Selector_Name (Parent (N2))
11179 Is_Instance_Node (Parent (Parent (N2)))))
11185 while Se /= Gen_Scope loop
11186 if Se = Standard_Standard then
11201 procedure Reset_Entity (N : Node_Id) is
11203 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
11204 -- If the type of N2 is global to the generic unit. Save
11205 -- the type in the generic node.
11207 function Top_Ancestor (E : Entity_Id) return Entity_Id;
11208 -- Find the ultimate ancestor of the current unit. If it is
11209 -- not a generic unit, then the name of the current unit
11210 -- in the prefix of an expanded name must be replaced with
11211 -- its generic homonym to ensure that it will be properly
11212 -- resolved in an instance.
11214 ---------------------
11215 -- Set_Global_Type --
11216 ---------------------
11218 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
11219 Typ : constant Entity_Id := Etype (N2);
11222 Set_Etype (N, Typ);
11224 if Entity (N) /= N2
11225 and then Has_Private_View (Entity (N))
11227 -- If the entity of N is not the associated node, this is
11228 -- a nested generic and it has an associated node as well,
11229 -- whose type is already the full view (see below). Indicate
11230 -- that the original node has a private view.
11232 Set_Has_Private_View (N);
11235 -- If not a private type, nothing else to do
11237 if not Is_Private_Type (Typ) then
11238 if Is_Array_Type (Typ)
11239 and then Is_Private_Type (Component_Type (Typ))
11241 Set_Has_Private_View (N);
11244 -- If it is a derivation of a private type in a context where
11245 -- no full view is needed, nothing to do either.
11247 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
11250 -- Otherwise mark the type for flipping and use the full_view
11254 Set_Has_Private_View (N);
11256 if Present (Full_View (Typ)) then
11257 Set_Etype (N2, Full_View (Typ));
11260 end Set_Global_Type;
11266 function Top_Ancestor (E : Entity_Id) return Entity_Id is
11271 while Is_Child_Unit (Par) loop
11272 Par := Scope (Par);
11278 -- Start of processing for Reset_Entity
11281 N2 := Get_Associated_Node (N);
11284 if Present (E) then
11285 if Is_Global (E) then
11286 Set_Global_Type (N, N2);
11288 elsif Nkind (N) = N_Op_Concat
11289 and then Is_Generic_Type (Etype (N2))
11291 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
11292 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
11293 and then Is_Intrinsic_Subprogram (E)
11298 -- Entity is local. Mark generic node as unresolved.
11299 -- Note that now it does not have an entity.
11301 Set_Associated_Node (N, Empty);
11302 Set_Etype (N, Empty);
11305 if Nkind (Parent (N)) in N_Generic_Instantiation
11306 and then N = Name (Parent (N))
11308 Save_Global_Defaults (Parent (N), Parent (N2));
11311 elsif Nkind (Parent (N)) = N_Selected_Component
11312 and then Nkind (Parent (N2)) = N_Expanded_Name
11314 if Is_Global (Entity (Parent (N2))) then
11315 Change_Selected_Component_To_Expanded_Name (Parent (N));
11316 Set_Associated_Node (Parent (N), Parent (N2));
11317 Set_Global_Type (Parent (N), Parent (N2));
11318 Save_Entity_Descendants (N);
11320 -- If this is a reference to the current generic entity, replace
11321 -- by the name of the generic homonym of the current package. This
11322 -- is because in an instantiation Par.P.Q will not resolve to the
11323 -- name of the instance, whose enclosing scope is not necessarily
11324 -- Par. We use the generic homonym rather that the name of the
11325 -- generic itself, because it may be hidden by a local
11328 elsif In_Open_Scopes (Entity (Parent (N2)))
11330 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
11332 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
11333 Rewrite (Parent (N),
11334 Make_Identifier (Sloc (N),
11336 Chars (Generic_Homonym (Entity (Parent (N2))))));
11338 Rewrite (Parent (N),
11339 Make_Identifier (Sloc (N),
11340 Chars => Chars (Selector_Name (Parent (N2)))));
11344 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
11345 and then Parent (N) = Name (Parent (Parent (N)))
11347 Save_Global_Defaults
11348 (Parent (Parent (N)), Parent (Parent ((N2))));
11351 -- A selected component may denote a static constant that has been
11352 -- folded. If the static constant is global to the generic, capture
11353 -- its value. Otherwise the folding will happen in any instantiation,
11355 elsif Nkind (Parent (N)) = N_Selected_Component
11356 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
11358 if Present (Entity (Original_Node (Parent (N2))))
11359 and then Is_Global (Entity (Original_Node (Parent (N2))))
11361 Rewrite (Parent (N), New_Copy (Parent (N2)));
11362 Set_Analyzed (Parent (N), False);
11368 -- A selected component may be transformed into a parameterless
11369 -- function call. If the called entity is global, rewrite the node
11370 -- appropriately, i.e. as an extended name for the global entity.
11372 elsif Nkind (Parent (N)) = N_Selected_Component
11373 and then Nkind (Parent (N2)) = N_Function_Call
11374 and then N = Selector_Name (Parent (N))
11376 if No (Parameter_Associations (Parent (N2))) then
11377 if Is_Global (Entity (Name (Parent (N2)))) then
11378 Change_Selected_Component_To_Expanded_Name (Parent (N));
11379 Set_Associated_Node (Parent (N), Name (Parent (N2)));
11380 Set_Global_Type (Parent (N), Name (Parent (N2)));
11381 Save_Entity_Descendants (N);
11384 Set_Associated_Node (N, Empty);
11385 Set_Etype (N, Empty);
11388 -- In Ada 2005, X.F may be a call to a primitive operation,
11389 -- rewritten as F (X). This rewriting will be done again in an
11390 -- instance, so keep the original node. Global entities will be
11391 -- captured as for other constructs.
11397 -- Entity is local. Reset in generic unit, so that node is resolved
11398 -- anew at the point of instantiation.
11401 Set_Associated_Node (N, Empty);
11402 Set_Etype (N, Empty);
11406 -----------------------------
11407 -- Save_Entity_Descendants --
11408 -----------------------------
11410 procedure Save_Entity_Descendants (N : Node_Id) is
11413 when N_Binary_Op =>
11414 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
11415 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11418 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11420 when N_Expanded_Name | N_Selected_Component =>
11421 Save_Global_Descendant (Union_Id (Prefix (N)));
11422 Save_Global_Descendant (Union_Id (Selector_Name (N)));
11424 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
11428 raise Program_Error;
11430 end Save_Entity_Descendants;
11432 --------------------------
11433 -- Save_Global_Defaults --
11434 --------------------------
11436 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
11437 Loc : constant Source_Ptr := Sloc (N1);
11438 Assoc2 : constant List_Id := Generic_Associations (N2);
11439 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
11446 Actual : Entity_Id;
11449 Assoc1 := Generic_Associations (N1);
11451 if Present (Assoc1) then
11452 Act1 := First (Assoc1);
11455 Set_Generic_Associations (N1, New_List);
11456 Assoc1 := Generic_Associations (N1);
11459 if Present (Assoc2) then
11460 Act2 := First (Assoc2);
11465 while Present (Act1) and then Present (Act2) loop
11470 -- Find the associations added for default suprograms
11472 if Present (Act2) then
11473 while Nkind (Act2) /= N_Generic_Association
11474 or else No (Entity (Selector_Name (Act2)))
11475 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
11480 -- Add a similar association if the default is global. The
11481 -- renaming declaration for the actual has been analyzed, and
11482 -- its alias is the program it renames. Link the actual in the
11483 -- original generic tree with the node in the analyzed tree.
11485 while Present (Act2) loop
11486 Subp := Entity (Selector_Name (Act2));
11487 Def := Explicit_Generic_Actual_Parameter (Act2);
11489 -- Following test is defence against rubbish errors
11491 if No (Alias (Subp)) then
11495 -- Retrieve the resolved actual from the renaming declaration
11496 -- created for the instantiated formal.
11498 Actual := Entity (Name (Parent (Parent (Subp))));
11499 Set_Entity (Def, Actual);
11500 Set_Etype (Def, Etype (Actual));
11502 if Is_Global (Actual) then
11504 Make_Generic_Association (Loc,
11505 Selector_Name => New_Occurrence_Of (Subp, Loc),
11506 Explicit_Generic_Actual_Parameter =>
11507 New_Occurrence_Of (Actual, Loc));
11509 Set_Associated_Node
11510 (Explicit_Generic_Actual_Parameter (Ndec), Def);
11512 Append (Ndec, Assoc1);
11514 -- If there are other defaults, add a dummy association in case
11515 -- there are other defaulted formals with the same name.
11517 elsif Present (Next (Act2)) then
11519 Make_Generic_Association (Loc,
11520 Selector_Name => New_Occurrence_Of (Subp, Loc),
11521 Explicit_Generic_Actual_Parameter => Empty);
11523 Append (Ndec, Assoc1);
11530 if Nkind (Name (N1)) = N_Identifier
11531 and then Is_Child_Unit (Gen_Id)
11532 and then Is_Global (Gen_Id)
11533 and then Is_Generic_Unit (Scope (Gen_Id))
11534 and then In_Open_Scopes (Scope (Gen_Id))
11536 -- This is an instantiation of a child unit within a sibling,
11537 -- so that the generic parent is in scope. An eventual instance
11538 -- must occur within the scope of an instance of the parent.
11539 -- Make name in instance into an expanded name, to preserve the
11540 -- identifier of the parent, so it can be resolved subsequently.
11542 Rewrite (Name (N2),
11543 Make_Expanded_Name (Loc,
11544 Chars => Chars (Gen_Id),
11545 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11546 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11547 Set_Entity (Name (N2), Gen_Id);
11549 Rewrite (Name (N1),
11550 Make_Expanded_Name (Loc,
11551 Chars => Chars (Gen_Id),
11552 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11553 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11555 Set_Associated_Node (Name (N1), Name (N2));
11556 Set_Associated_Node (Prefix (Name (N1)), Empty);
11557 Set_Associated_Node
11558 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
11559 Set_Etype (Name (N1), Etype (Gen_Id));
11562 end Save_Global_Defaults;
11564 ----------------------------
11565 -- Save_Global_Descendant --
11566 ----------------------------
11568 procedure Save_Global_Descendant (D : Union_Id) is
11572 if D in Node_Range then
11573 if D = Union_Id (Empty) then
11576 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
11577 Save_References (Node_Id (D));
11580 elsif D in List_Range then
11581 if D = Union_Id (No_List)
11582 or else Is_Empty_List (List_Id (D))
11587 N1 := First (List_Id (D));
11588 while Present (N1) loop
11589 Save_References (N1);
11594 -- Element list or other non-node field, nothing to do
11599 end Save_Global_Descendant;
11601 ---------------------
11602 -- Save_References --
11603 ---------------------
11605 -- This is the recursive procedure that does the work, once the
11606 -- enclosing generic scope has been established. We have to treat
11607 -- specially a number of node rewritings that are required by semantic
11608 -- processing and which change the kind of nodes in the generic copy:
11609 -- typically constant-folding, replacing an operator node by a string
11610 -- literal, or a selected component by an expanded name. In each of
11611 -- those cases, the transformation is propagated to the generic unit.
11613 procedure Save_References (N : Node_Id) is
11618 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
11619 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11622 elsif Nkind (N) = N_Operator_Symbol
11623 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
11625 Change_Operator_Symbol_To_String_Literal (N);
11628 elsif Nkind (N) in N_Op then
11629 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11630 if Nkind (N) = N_Op_Concat then
11631 Set_Is_Component_Left_Opnd (N,
11632 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11634 Set_Is_Component_Right_Opnd (N,
11635 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11641 -- Node may be transformed into call to a user-defined operator
11643 N2 := Get_Associated_Node (N);
11645 if Nkind (N2) = N_Function_Call then
11646 E := Entity (Name (N2));
11649 and then Is_Global (E)
11651 Set_Etype (N, Etype (N2));
11653 Set_Associated_Node (N, Empty);
11654 Set_Etype (N, Empty);
11657 elsif Nkind_In (N2, N_Integer_Literal,
11661 if Present (Original_Node (N2))
11662 and then Nkind (Original_Node (N2)) = Nkind (N)
11665 -- Operation was constant-folded. Whenever possible,
11666 -- recover semantic information from unfolded node,
11669 Set_Associated_Node (N, Original_Node (N2));
11671 if Nkind (N) = N_Op_Concat then
11672 Set_Is_Component_Left_Opnd (N,
11673 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11674 Set_Is_Component_Right_Opnd (N,
11675 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11681 -- If original node is already modified, propagate
11682 -- constant-folding to template.
11684 Rewrite (N, New_Copy (N2));
11685 Set_Analyzed (N, False);
11688 elsif Nkind (N2) = N_Identifier
11689 and then Ekind (Entity (N2)) = E_Enumeration_Literal
11691 -- Same if call was folded into a literal, but in this case
11692 -- retain the entity to avoid spurious ambiguities if id is
11693 -- overloaded at the point of instantiation or inlining.
11695 Rewrite (N, New_Copy (N2));
11696 Set_Analyzed (N, False);
11700 -- Complete operands check if node has not been constant-folded
11702 if Nkind (N) in N_Op then
11703 Save_Entity_Descendants (N);
11706 elsif Nkind (N) = N_Identifier then
11707 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11709 -- If this is a discriminant reference, always save it. It is
11710 -- used in the instance to find the corresponding discriminant
11711 -- positionally rather than by name.
11713 Set_Original_Discriminant
11714 (N, Original_Discriminant (Get_Associated_Node (N)));
11718 N2 := Get_Associated_Node (N);
11720 if Nkind (N2) = N_Function_Call then
11721 E := Entity (Name (N2));
11723 -- Name resolves to a call to parameterless function. If
11724 -- original entity is global, mark node as resolved.
11727 and then Is_Global (E)
11729 Set_Etype (N, Etype (N2));
11731 Set_Associated_Node (N, Empty);
11732 Set_Etype (N, Empty);
11735 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
11736 and then Is_Entity_Name (Original_Node (N2))
11738 -- Name resolves to named number that is constant-folded,
11739 -- We must preserve the original name for ASIS use, and
11740 -- undo the constant-folding, which will be repeated in
11743 Set_Associated_Node (N, Original_Node (N2));
11746 elsif Nkind (N2) = N_String_Literal then
11748 -- Name resolves to string literal. Perform the same
11749 -- replacement in generic.
11751 Rewrite (N, New_Copy (N2));
11753 elsif Nkind (N2) = N_Explicit_Dereference then
11755 -- An identifier is rewritten as a dereference if it is
11756 -- the prefix in a selected component, and it denotes an
11757 -- access to a composite type, or a parameterless function
11758 -- call that returns an access type.
11760 -- Check whether corresponding entity in prefix is global
11762 if Is_Entity_Name (Prefix (N2))
11763 and then Present (Entity (Prefix (N2)))
11764 and then Is_Global (Entity (Prefix (N2)))
11767 Make_Explicit_Dereference (Sloc (N),
11768 Prefix => Make_Identifier (Sloc (N),
11769 Chars => Chars (N))));
11770 Set_Associated_Node (Prefix (N), Prefix (N2));
11772 elsif Nkind (Prefix (N2)) = N_Function_Call
11773 and then Is_Global (Entity (Name (Prefix (N2))))
11776 Make_Explicit_Dereference (Sloc (N),
11777 Prefix => Make_Function_Call (Sloc (N),
11779 Make_Identifier (Sloc (N),
11780 Chars => Chars (N)))));
11782 Set_Associated_Node
11783 (Name (Prefix (N)), Name (Prefix (N2)));
11786 Set_Associated_Node (N, Empty);
11787 Set_Etype (N, Empty);
11790 -- The subtype mark of a nominally unconstrained object is
11791 -- rewritten as a subtype indication using the bounds of the
11792 -- expression. Recover the original subtype mark.
11794 elsif Nkind (N2) = N_Subtype_Indication
11795 and then Is_Entity_Name (Original_Node (N2))
11797 Set_Associated_Node (N, Original_Node (N2));
11805 elsif Nkind (N) in N_Entity then
11810 Loc : constant Source_Ptr := Sloc (N);
11811 Qual : Node_Id := Empty;
11812 Typ : Entity_Id := Empty;
11815 use Atree.Unchecked_Access;
11816 -- This code section is part of implementing an untyped tree
11817 -- traversal, so it needs direct access to node fields.
11820 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
11821 N2 := Get_Associated_Node (N);
11828 -- In an instance within a generic, use the name of the
11829 -- actual and not the original generic parameter. If the
11830 -- actual is global in the current generic it must be
11831 -- preserved for its instantiation.
11833 if Nkind (Parent (Typ)) = N_Subtype_Declaration
11835 Present (Generic_Parent_Type (Parent (Typ)))
11837 Typ := Base_Type (Typ);
11838 Set_Etype (N2, Typ);
11844 or else not Is_Global (Typ)
11846 Set_Associated_Node (N, Empty);
11848 -- If the aggregate is an actual in a call, it has been
11849 -- resolved in the current context, to some local type.
11850 -- The enclosing call may have been disambiguated by the
11851 -- aggregate, and this disambiguation might fail at
11852 -- instantiation time because the type to which the
11853 -- aggregate did resolve is not preserved. In order to
11854 -- preserve some of this information, we wrap the
11855 -- aggregate in a qualified expression, using the id of
11856 -- its type. For further disambiguation we qualify the
11857 -- type name with its scope (if visible) because both
11858 -- id's will have corresponding entities in an instance.
11859 -- This resolves most of the problems with missing type
11860 -- information on aggregates in instances.
11862 if Nkind (N2) = Nkind (N)
11864 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
11866 and then Comes_From_Source (Typ)
11868 if Is_Immediately_Visible (Scope (Typ)) then
11869 Nam := Make_Selected_Component (Loc,
11871 Make_Identifier (Loc, Chars (Scope (Typ))),
11873 Make_Identifier (Loc, Chars (Typ)));
11875 Nam := Make_Identifier (Loc, Chars (Typ));
11879 Make_Qualified_Expression (Loc,
11880 Subtype_Mark => Nam,
11881 Expression => Relocate_Node (N));
11885 Save_Global_Descendant (Field1 (N));
11886 Save_Global_Descendant (Field2 (N));
11887 Save_Global_Descendant (Field3 (N));
11888 Save_Global_Descendant (Field5 (N));
11890 if Present (Qual) then
11894 -- All other cases than aggregates
11897 Save_Global_Descendant (Field1 (N));
11898 Save_Global_Descendant (Field2 (N));
11899 Save_Global_Descendant (Field3 (N));
11900 Save_Global_Descendant (Field4 (N));
11901 Save_Global_Descendant (Field5 (N));
11905 end Save_References;
11907 -- Start of processing for Save_Global_References
11910 Gen_Scope := Current_Scope;
11912 -- If the generic unit is a child unit, references to entities in the
11913 -- parent are treated as local, because they will be resolved anew in
11914 -- the context of the instance of the parent.
11916 while Is_Child_Unit (Gen_Scope)
11917 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
11919 Gen_Scope := Scope (Gen_Scope);
11922 Save_References (N);
11923 end Save_Global_References;
11925 --------------------------------------
11926 -- Set_Copied_Sloc_For_Inlined_Body --
11927 --------------------------------------
11929 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
11931 Create_Instantiation_Source (N, E, True, S_Adjustment);
11932 end Set_Copied_Sloc_For_Inlined_Body;
11934 ---------------------
11935 -- Set_Instance_Of --
11936 ---------------------
11938 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
11940 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
11941 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
11942 Generic_Renamings.Increment_Last;
11943 end Set_Instance_Of;
11945 --------------------
11946 -- Set_Next_Assoc --
11947 --------------------
11949 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
11951 Generic_Renamings.Table (E).Next_In_HTable := Next;
11952 end Set_Next_Assoc;
11954 -------------------
11955 -- Start_Generic --
11956 -------------------
11958 procedure Start_Generic is
11960 -- ??? More things could be factored out in this routine.
11961 -- Should probably be done at a later stage.
11963 Generic_Flags.Append (Inside_A_Generic);
11964 Inside_A_Generic := True;
11966 Expander_Mode_Save_And_Set (False);
11969 ----------------------
11970 -- Set_Instance_Env --
11971 ----------------------
11973 procedure Set_Instance_Env
11974 (Gen_Unit : Entity_Id;
11975 Act_Unit : Entity_Id)
11978 -- Regardless of the current mode, predefined units are analyzed in
11979 -- the most current Ada mode, and earlier version Ada checks do not
11980 -- apply to predefined units. Nothing needs to be done for non-internal
11981 -- units. These are always analyzed in the current mode.
11983 if Is_Internal_File_Name
11984 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
11985 Renamings_Included => True)
11987 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
11990 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
11991 end Set_Instance_Env;
11997 procedure Switch_View (T : Entity_Id) is
11998 BT : constant Entity_Id := Base_Type (T);
11999 Priv_Elmt : Elmt_Id := No_Elmt;
12000 Priv_Sub : Entity_Id;
12003 -- T may be private but its base type may have been exchanged through
12004 -- some other occurrence, in which case there is nothing to switch
12005 -- besides T itself. Note that a private dependent subtype of a private
12006 -- type might not have been switched even if the base type has been,
12007 -- because of the last branch of Check_Private_View (see comment there).
12009 if not Is_Private_Type (BT) then
12010 Prepend_Elmt (Full_View (T), Exchanged_Views);
12011 Exchange_Declarations (T);
12015 Priv_Elmt := First_Elmt (Private_Dependents (BT));
12017 if Present (Full_View (BT)) then
12018 Prepend_Elmt (Full_View (BT), Exchanged_Views);
12019 Exchange_Declarations (BT);
12022 while Present (Priv_Elmt) loop
12023 Priv_Sub := (Node (Priv_Elmt));
12025 -- We avoid flipping the subtype if the Etype of its full view is
12026 -- private because this would result in a malformed subtype. This
12027 -- occurs when the Etype of the subtype full view is the full view of
12028 -- the base type (and since the base types were just switched, the
12029 -- subtype is pointing to the wrong view). This is currently the case
12030 -- for tagged record types, access types (maybe more?) and needs to
12031 -- be resolved. ???
12033 if Present (Full_View (Priv_Sub))
12034 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
12036 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
12037 Exchange_Declarations (Priv_Sub);
12040 Next_Elmt (Priv_Elmt);
12044 -----------------------------
12045 -- Valid_Default_Attribute --
12046 -----------------------------
12048 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
12049 Attr_Id : constant Attribute_Id :=
12050 Get_Attribute_Id (Attribute_Name (Def));
12051 T : constant Entity_Id := Entity (Prefix (Def));
12052 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
12065 F := First_Formal (Nam);
12066 while Present (F) loop
12067 Num_F := Num_F + 1;
12072 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12073 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12074 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12075 Attribute_Unbiased_Rounding =>
12078 and then Is_Floating_Point_Type (T);
12080 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12081 Attribute_Value | Attribute_Wide_Image |
12082 Attribute_Wide_Value =>
12083 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
12085 when Attribute_Max | Attribute_Min =>
12086 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
12088 when Attribute_Input =>
12089 OK := (Is_Fun and then Num_F = 1);
12091 when Attribute_Output | Attribute_Read | Attribute_Write =>
12092 OK := (not Is_Fun and then Num_F = 2);
12099 Error_Msg_N ("attribute reference has wrong profile for subprogram",
12102 end Valid_Default_Attribute;
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