1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
36 with Itypes; use Itypes;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Nlists; use Nlists;
41 with Namet; use Namet;
42 with Nmake; use Nmake;
44 with Rident; use Rident;
45 with Restrict; use Restrict;
46 with Rtsfind; use Rtsfind;
48 with Sem_Aux; use Sem_Aux;
49 with Sem_Cat; use Sem_Cat;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Ch10; use Sem_Ch10;
55 with Sem_Ch13; use Sem_Ch13;
56 with Sem_Disp; use Sem_Disp;
57 with Sem_Elab; use Sem_Elab;
58 with Sem_Elim; use Sem_Elim;
59 with Sem_Eval; use Sem_Eval;
60 with Sem_Res; use Sem_Res;
61 with Sem_Type; use Sem_Type;
62 with Sem_Util; use Sem_Util;
63 with Sem_Warn; use Sem_Warn;
64 with Stand; use Stand;
65 with Sinfo; use Sinfo;
66 with Sinfo.CN; use Sinfo.CN;
67 with Sinput; use Sinput;
68 with Sinput.L; use Sinput.L;
69 with Snames; use Snames;
70 with Stringt; use Stringt;
71 with Uname; use Uname;
73 with Tbuild; use Tbuild;
74 with Uintp; use Uintp;
75 with Urealp; use Urealp;
79 package body Sem_Ch12 is
81 ----------------------------------------------------------
82 -- Implementation of Generic Analysis and Instantiation --
83 ----------------------------------------------------------
85 -- GNAT implements generics by macro expansion. No attempt is made to share
86 -- generic instantiations (for now). Analysis of a generic definition does
87 -- not perform any expansion action, but the expander must be called on the
88 -- tree for each instantiation, because the expansion may of course depend
89 -- on the generic actuals. All of this is best achieved as follows:
91 -- a) Semantic analysis of a generic unit is performed on a copy of the
92 -- tree for the generic unit. All tree modifications that follow analysis
93 -- do not affect the original tree. Links are kept between the original
94 -- tree and the copy, in order to recognize non-local references within
95 -- the generic, and propagate them to each instance (recall that name
96 -- resolution is done on the generic declaration: generics are not really
97 -- macros!). This is summarized in the following diagram:
99 -- .-----------. .----------.
100 -- | semantic |<--------------| generic |
102 -- | |==============>| |
103 -- |___________| global |__________|
114 -- b) Each instantiation copies the original tree, and inserts into it a
115 -- series of declarations that describe the mapping between generic formals
116 -- and actuals. For example, a generic In OUT parameter is an object
117 -- renaming of the corresponding actual, etc. Generic IN parameters are
118 -- constant declarations.
120 -- c) In order to give the right visibility for these renamings, we use
121 -- a different scheme for package and subprogram instantiations. For
122 -- packages, the list of renamings is inserted into the package
123 -- specification, before the visible declarations of the package. The
124 -- renamings are analyzed before any of the text of the instance, and are
125 -- thus visible at the right place. Furthermore, outside of the instance,
126 -- the generic parameters are visible and denote their corresponding
129 -- For subprograms, we create a container package to hold the renamings
130 -- and the subprogram instance itself. Analysis of the package makes the
131 -- renaming declarations visible to the subprogram. After analyzing the
132 -- package, the defining entity for the subprogram is touched-up so that
133 -- it appears declared in the current scope, and not inside the container
136 -- If the instantiation is a compilation unit, the container package is
137 -- given the same name as the subprogram instance. This ensures that
138 -- the elaboration procedure called by the binder, using the compilation
139 -- unit name, calls in fact the elaboration procedure for the package.
141 -- Not surprisingly, private types complicate this approach. By saving in
142 -- the original generic object the non-local references, we guarantee that
143 -- the proper entities are referenced at the point of instantiation.
144 -- However, for private types, this by itself does not insure that the
145 -- proper VIEW of the entity is used (the full type may be visible at the
146 -- point of generic definition, but not at instantiation, or vice-versa).
147 -- In order to reference the proper view, we special-case any reference
148 -- to private types in the generic object, by saving both views, one in
149 -- the generic and one in the semantic copy. At time of instantiation, we
150 -- check whether the two views are consistent, and exchange declarations if
151 -- necessary, in order to restore the correct visibility. Similarly, if
152 -- the instance view is private when the generic view was not, we perform
153 -- the exchange. After completing the instantiation, we restore the
154 -- current visibility. The flag Has_Private_View marks identifiers in the
155 -- the generic unit that require checking.
157 -- Visibility within nested generic units requires special handling.
158 -- Consider the following scheme:
160 -- type Global is ... -- outside of generic unit.
164 -- type Semi_Global is ... -- global to inner.
167 -- procedure inner (X1 : Global; X2 : Semi_Global);
169 -- procedure in2 is new inner (...); -- 4
172 -- package New_Outer is new Outer (...); -- 2
173 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
175 -- The semantic analysis of Outer captures all occurrences of Global.
176 -- The semantic analysis of Inner (at 1) captures both occurrences of
177 -- Global and Semi_Global.
179 -- At point 2 (instantiation of Outer), we also produce a generic copy
180 -- of Inner, even though Inner is, at that point, not being instantiated.
181 -- (This is just part of the semantic analysis of New_Outer).
183 -- Critically, references to Global within Inner must be preserved, while
184 -- references to Semi_Global should not preserved, because they must now
185 -- resolve to an entity within New_Outer. To distinguish between these, we
186 -- use a global variable, Current_Instantiated_Parent, which is set when
187 -- performing a generic copy during instantiation (at 2). This variable is
188 -- used when performing a generic copy that is not an instantiation, but
189 -- that is nested within one, as the occurrence of 1 within 2. The analysis
190 -- of a nested generic only preserves references that are global to the
191 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
192 -- determine whether a reference is external to the given parent.
194 -- The instantiation at point 3 requires no special treatment. The method
195 -- works as well for further nestings of generic units, but of course the
196 -- variable Current_Instantiated_Parent must be stacked because nested
197 -- instantiations can occur, e.g. the occurrence of 4 within 2.
199 -- The instantiation of package and subprogram bodies is handled in a
200 -- similar manner, except that it is delayed until after semantic
201 -- analysis is complete. In this fashion complex cross-dependencies
202 -- between several package declarations and bodies containing generics
203 -- can be compiled which otherwise would diagnose spurious circularities.
205 -- For example, it is possible to compile two packages A and B that
206 -- have the following structure:
208 -- package A is package B is
209 -- generic ... generic ...
210 -- package G_A is package G_B is
213 -- package body A is package body B is
214 -- package N_B is new G_B (..) package N_A is new G_A (..)
216 -- The table Pending_Instantiations in package Inline is used to keep
217 -- track of body instantiations that are delayed in this manner. Inline
218 -- handles the actual calls to do the body instantiations. This activity
219 -- is part of Inline, since the processing occurs at the same point, and
220 -- for essentially the same reason, as the handling of inlined routines.
222 ----------------------------------------------
223 -- Detection of Instantiation Circularities --
224 ----------------------------------------------
226 -- If we have a chain of instantiations that is circular, this is static
227 -- error which must be detected at compile time. The detection of these
228 -- circularities is carried out at the point that we insert a generic
229 -- instance spec or body. If there is a circularity, then the analysis of
230 -- the offending spec or body will eventually result in trying to load the
231 -- same unit again, and we detect this problem as we analyze the package
232 -- instantiation for the second time.
234 -- At least in some cases after we have detected the circularity, we get
235 -- into trouble if we try to keep going. The following flag is set if a
236 -- circularity is detected, and used to abandon compilation after the
237 -- messages have been posted.
239 Circularity_Detected : Boolean := False;
240 -- This should really be reset on encountering a new main unit, but in
241 -- practice we are not using multiple main units so it is not critical.
243 -------------------------------------------------
244 -- Formal packages and partial parametrization --
245 -------------------------------------------------
247 -- When compiling a generic, a formal package is a local instantiation. If
248 -- declared with a box, its generic formals are visible in the enclosing
249 -- generic. If declared with a partial list of actuals, those actuals that
250 -- are defaulted (covered by an Others clause, or given an explicit box
251 -- initialization) are also visible in the enclosing generic, while those
252 -- that have a corresponding actual are not.
254 -- In our source model of instantiation, the same visibility must be
255 -- present in the spec and body of an instance: the names of the formals
256 -- that are defaulted must be made visible within the instance, and made
257 -- invisible (hidden) after the instantiation is complete, so that they
258 -- are not accessible outside of the instance.
260 -- In a generic, a formal package is treated like a special instantiation.
261 -- Our Ada95 compiler handled formals with and without box in different
262 -- ways. With partial parametrization, we use a single model for both.
263 -- We create a package declaration that consists of the specification of
264 -- the generic package, and a set of declarations that map the actuals
265 -- into local renamings, just as we do for bona fide instantiations. For
266 -- defaulted parameters and formals with a box, we copy directly the
267 -- declarations of the formal into this local package. The result is a
268 -- a package whose visible declarations may include generic formals. This
269 -- package is only used for type checking and visibility analysis, and
270 -- never reaches the back-end, so it can freely violate the placement
271 -- rules for generic formal declarations.
273 -- The list of declarations (renamings and copies of formals) is built
274 -- by Analyze_Associations, just as for regular instantiations.
276 -- At the point of instantiation, conformance checking must be applied only
277 -- to those parameters that were specified in the formal. We perform this
278 -- checking by creating another internal instantiation, this one including
279 -- only the renamings and the formals (the rest of the package spec is not
280 -- relevant to conformance checking). We can then traverse two lists: the
281 -- list of actuals in the instance that corresponds to the formal package,
282 -- and the list of actuals produced for this bogus instantiation. We apply
283 -- the conformance rules to those actuals that are not defaulted (i.e.
284 -- which still appear as generic formals.
286 -- When we compile an instance body we must make the right parameters
287 -- visible again. The predicate Is_Generic_Formal indicates which of the
288 -- formals should have its Is_Hidden flag reset.
290 -----------------------
291 -- Local subprograms --
292 -----------------------
294 procedure Abandon_Instantiation (N : Node_Id);
295 pragma No_Return (Abandon_Instantiation);
296 -- Posts an error message "instantiation abandoned" at the indicated node
297 -- and then raises the exception Instantiation_Error to do it.
299 procedure Analyze_Formal_Array_Type
300 (T : in out Entity_Id;
302 -- A formal array type is treated like an array type declaration, and
303 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
304 -- in-out, because in the case of an anonymous type the entity is
305 -- actually created in the procedure.
307 -- The following procedures treat other kinds of formal parameters
309 procedure Analyze_Formal_Derived_Interface_Type
314 procedure Analyze_Formal_Derived_Type
319 procedure Analyze_Formal_Interface_Type
324 -- The following subprograms create abbreviated declarations for formal
325 -- scalar types. We introduce an anonymous base of the proper class for
326 -- each of them, and define the formals as constrained first subtypes of
327 -- their bases. The bounds are expressions that are non-static in the
330 procedure Analyze_Formal_Decimal_Fixed_Point_Type
331 (T : Entity_Id; Def : Node_Id);
332 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
333 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
334 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
335 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
337 (T : Entity_Id; Def : Node_Id);
339 procedure Analyze_Formal_Private_Type
343 -- Creates a new private type, which does not require completion
345 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id);
346 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
348 procedure Analyze_Generic_Formal_Part (N : Node_Id);
349 -- Analyze generic formal part
351 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
352 -- Create a new access type with the given designated type
354 function Analyze_Associations
357 F_Copy : List_Id) return List_Id;
358 -- At instantiation time, build the list of associations between formals
359 -- and actuals. Each association becomes a renaming declaration for the
360 -- formal entity. F_Copy is the analyzed list of formals in the generic
361 -- copy. It is used to apply legality checks to the actuals. I_Node is the
362 -- instantiation node itself.
364 procedure Analyze_Subprogram_Instantiation
368 procedure Build_Instance_Compilation_Unit_Nodes
372 -- This procedure is used in the case where the generic instance of a
373 -- subprogram body or package body is a library unit. In this case, the
374 -- original library unit node for the generic instantiation must be
375 -- replaced by the resulting generic body, and a link made to a new
376 -- compilation unit node for the generic declaration. The argument N is
377 -- the original generic instantiation. Act_Body and Act_Decl are the body
378 -- and declaration of the instance (either package body and declaration
379 -- nodes or subprogram body and declaration nodes depending on the case).
380 -- On return, the node N has been rewritten with the actual body.
382 procedure Check_Access_Definition (N : Node_Id);
383 -- Subsidiary routine to null exclusion processing. Perform an assertion
384 -- check on Ada version and the presence of an access definition in N.
386 procedure Check_Formal_Packages (P_Id : Entity_Id);
387 -- Apply the following to all formal packages in generic associations
389 procedure Check_Formal_Package_Instance
390 (Formal_Pack : Entity_Id;
391 Actual_Pack : Entity_Id);
392 -- Verify that the actuals of the actual instance match the actuals of
393 -- the template for a formal package that is not declared with a box.
395 procedure Check_Forward_Instantiation (Decl : Node_Id);
396 -- If the generic is a local entity and the corresponding body has not
397 -- been seen yet, flag enclosing packages to indicate that it will be
398 -- elaborated after the generic body. Subprograms declared in the same
399 -- package cannot be inlined by the front-end because front-end inlining
400 -- requires a strict linear order of elaboration.
402 procedure Check_Hidden_Child_Unit
404 Gen_Unit : Entity_Id;
405 Act_Decl_Id : Entity_Id);
406 -- If the generic unit is an implicit child instance within a parent
407 -- instance, we need to make an explicit test that it is not hidden by
408 -- a child instance of the same name and parent.
410 procedure Check_Generic_Actuals
411 (Instance : Entity_Id;
412 Is_Formal_Box : Boolean);
413 -- Similar to previous one. Check the actuals in the instantiation,
414 -- whose views can change between the point of instantiation and the point
415 -- of instantiation of the body. In addition, mark the generic renamings
416 -- as generic actuals, so that they are not compatible with other actuals.
417 -- Recurse on an actual that is a formal package whose declaration has
420 function Contains_Instance_Of
423 N : Node_Id) return Boolean;
424 -- Inner is instantiated within the generic Outer. Check whether Inner
425 -- directly or indirectly contains an instance of Outer or of one of its
426 -- parents, in the case of a subunit. Each generic unit holds a list of
427 -- the entities instantiated within (at any depth). This procedure
428 -- determines whether the set of such lists contains a cycle, i.e. an
429 -- illegal circular instantiation.
431 function Denotes_Formal_Package
433 On_Exit : Boolean := False;
434 Instance : Entity_Id := Empty) return Boolean;
435 -- Returns True if E is a formal package of an enclosing generic, or
436 -- the actual for such a formal in an enclosing instantiation. If such
437 -- a package is used as a formal in an nested generic, or as an actual
438 -- in a nested instantiation, the visibility of ITS formals should not
439 -- be modified. When called from within Restore_Private_Views, the flag
440 -- On_Exit is true, to indicate that the search for a possible enclosing
441 -- instance should ignore the current one. In that case Instance denotes
442 -- the declaration for which this is an actual. This declaration may be
443 -- an instantiation in the source, or the internal instantiation that
444 -- corresponds to the actual for a formal package.
446 function Find_Actual_Type
448 Gen_Type : Entity_Id) return Entity_Id;
449 -- When validating the actual types of a child instance, check whether
450 -- the formal is a formal type of the parent unit, and retrieve the current
451 -- actual for it. Typ is the entity in the analyzed formal type declaration
452 -- (component or index type of an array type, or designated type of an
453 -- access formal) and Gen_Type is the enclosing analyzed formal array
454 -- or access type. The desired actual may be a formal of a parent, or may
455 -- be declared in a formal package of a parent. In both cases it is a
456 -- generic actual type because it appears within a visible instance.
457 -- Finally, it may be declared in a parent unit without being a formal
458 -- of that unit, in which case it must be retrieved by visibility.
459 -- Ambiguities may still arise if two homonyms are declared in two formal
460 -- packages, and the prefix of the formal type may be needed to resolve
461 -- the ambiguity in the instance ???
463 function In_Same_Declarative_Part
465 Inst : Node_Id) return Boolean;
466 -- True if the instantiation Inst and the given freeze_node F_Node appear
467 -- within the same declarative part, ignoring subunits, but with no inter-
468 -- vening subprograms or concurrent units. If true, the freeze node
469 -- of the instance can be placed after the freeze node of the parent,
470 -- which it itself an instance.
472 function In_Main_Context (E : Entity_Id) return Boolean;
473 -- Check whether an instantiation is in the context of the main unit.
474 -- Used to determine whether its body should be elaborated to allow
475 -- front-end inlining.
477 procedure Set_Instance_Env
478 (Gen_Unit : Entity_Id;
479 Act_Unit : Entity_Id);
480 -- Save current instance on saved environment, to be used to determine
481 -- the global status of entities in nested instances. Part of Save_Env.
482 -- called after verifying that the generic unit is legal for the instance,
483 -- The procedure also examines whether the generic unit is a predefined
484 -- unit, in order to set configuration switches accordingly. As a result
485 -- the procedure must be called after analyzing and freezing the actuals.
487 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
488 -- Associate analyzed generic parameter with corresponding
489 -- instance. Used for semantic checks at instantiation time.
491 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
492 -- Traverse the Exchanged_Views list to see if a type was private
493 -- and has already been flipped during this phase of instantiation.
495 procedure Hide_Current_Scope;
496 -- When instantiating a generic child unit, the parent context must be
497 -- present, but the instance and all entities that may be generated
498 -- must be inserted in the current scope. We leave the current scope
499 -- on the stack, but make its entities invisible to avoid visibility
500 -- problems. This is reversed at the end of the instantiation. This is
501 -- not done for the instantiation of the bodies, which only require the
502 -- instances of the generic parents to be in scope.
504 procedure Install_Body
509 -- If the instantiation happens textually before the body of the generic,
510 -- the instantiation of the body must be analyzed after the generic body,
511 -- and not at the point of instantiation. Such early instantiations can
512 -- happen if the generic and the instance appear in a package declaration
513 -- because the generic body can only appear in the corresponding package
514 -- body. Early instantiations can also appear if generic, instance and
515 -- body are all in the declarative part of a subprogram or entry. Entities
516 -- of packages that are early instantiations are delayed, and their freeze
517 -- node appears after the generic body.
519 procedure Insert_Freeze_Node_For_Instance
522 -- N denotes a package or a subprogram instantiation and F_Node is the
523 -- associated freeze node. Insert the freeze node before the first source
524 -- body which follows immediately after N. If no such body is found, the
525 -- freeze node is inserted at the end of the declarative region which
528 procedure Freeze_Subprogram_Body
529 (Inst_Node : Node_Id;
531 Pack_Id : Entity_Id);
532 -- The generic body may appear textually after the instance, including
533 -- in the proper body of a stub, or within a different package instance.
534 -- Given that the instance can only be elaborated after the generic, we
535 -- place freeze_nodes for the instance and/or for packages that may enclose
536 -- the instance and the generic, so that the back-end can establish the
537 -- proper order of elaboration.
540 -- Establish environment for subsequent instantiation. Separated from
541 -- Save_Env because data-structures for visibility handling must be
542 -- initialized before call to Check_Generic_Child_Unit.
544 procedure Install_Formal_Packages (Par : Entity_Id);
545 -- Install the visible part of any formal of the parent that is a formal
546 -- package. Note that for the case of a formal package with a box, this
547 -- includes the formal part of the formal package (12.7(10/2)).
549 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
550 -- When compiling an instance of a child unit the parent (which is
551 -- itself an instance) is an enclosing scope that must be made
552 -- immediately visible. This procedure is also used to install the non-
553 -- generic parent of a generic child unit when compiling its body, so
554 -- that full views of types in the parent are made visible.
556 procedure Remove_Parent (In_Body : Boolean := False);
557 -- Reverse effect after instantiation of child is complete
559 procedure Inline_Instance_Body
561 Gen_Unit : Entity_Id;
563 -- If front-end inlining is requested, instantiate the package body,
564 -- and preserve the visibility of its compilation unit, to insure
565 -- that successive instantiations succeed.
567 -- The functions Instantiate_XXX perform various legality checks and build
568 -- the declarations for instantiated generic parameters. In all of these
569 -- Formal is the entity in the generic unit, Actual is the entity of
570 -- expression in the generic associations, and Analyzed_Formal is the
571 -- formal in the generic copy, which contains the semantic information to
572 -- be used to validate the actual.
574 function Instantiate_Object
577 Analyzed_Formal : Node_Id) return List_Id;
579 function Instantiate_Type
582 Analyzed_Formal : Node_Id;
583 Actual_Decls : List_Id) return List_Id;
585 function Instantiate_Formal_Subprogram
588 Analyzed_Formal : Node_Id) return Node_Id;
590 function Instantiate_Formal_Package
593 Analyzed_Formal : Node_Id) return List_Id;
594 -- If the formal package is declared with a box, special visibility rules
595 -- apply to its formals: they are in the visible part of the package. This
596 -- is true in the declarative region of the formal package, that is to say
597 -- in the enclosing generic or instantiation. For an instantiation, the
598 -- parameters of the formal package are made visible in an explicit step.
599 -- Furthermore, if the actual has a visible USE clause, these formals must
600 -- be made potentially use-visible as well. On exit from the enclosing
601 -- instantiation, the reverse must be done.
603 -- For a formal package declared without a box, there are conformance rules
604 -- that apply to the actuals in the generic declaration and the actuals of
605 -- the actual package in the enclosing instantiation. The simplest way to
606 -- apply these rules is to repeat the instantiation of the formal package
607 -- in the context of the enclosing instance, and compare the generic
608 -- associations of this instantiation with those of the actual package.
609 -- This internal instantiation only needs to contain the renamings of the
610 -- formals: the visible and private declarations themselves need not be
613 -- In Ada 2005, the formal package may be only partially parameterized.
614 -- In that case the visibility step must make visible those actuals whose
615 -- corresponding formals were given with a box. A final complication
616 -- involves inherited operations from formal derived types, which must
617 -- be visible if the type is.
619 function Is_In_Main_Unit (N : Node_Id) return Boolean;
620 -- Test if given node is in the main unit
622 procedure Load_Parent_Of_Generic
625 Body_Optional : Boolean := False);
626 -- If the generic appears in a separate non-generic library unit, load the
627 -- corresponding body to retrieve the body of the generic. N is the node
628 -- for the generic instantiation, Spec is the generic package declaration.
630 -- Body_Optional is a flag that indicates that the body is being loaded to
631 -- ensure that temporaries are generated consistently when there are other
632 -- instances in the current declarative part that precede the one being
633 -- loaded. In that case a missing body is acceptable.
635 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
636 -- Add the context clause of the unit containing a generic unit to a
637 -- compilation unit that is, or contains, an instantiation.
639 function Get_Associated_Node (N : Node_Id) return Node_Id;
640 -- In order to propagate semantic information back from the analyzed copy
641 -- to the original generic, we maintain links between selected nodes in the
642 -- generic and their corresponding copies. At the end of generic analysis,
643 -- the routine Save_Global_References traverses the generic tree, examines
644 -- the semantic information, and preserves the links to those nodes that
645 -- contain global information. At instantiation, the information from the
646 -- associated node is placed on the new copy, so that name resolution is
649 -- Three kinds of source nodes have associated nodes:
651 -- a) those that can reference (denote) entities, that is identifiers,
652 -- character literals, expanded_names, operator symbols, operators,
653 -- and attribute reference nodes. These nodes have an Entity field
654 -- and are the set of nodes that are in N_Has_Entity.
656 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
658 -- c) selected components (N_Selected_Component)
660 -- For the first class, the associated node preserves the entity if it is
661 -- global. If the generic contains nested instantiations, the associated
662 -- node itself has been recopied, and a chain of them must be followed.
664 -- For aggregates, the associated node allows retrieval of the type, which
665 -- may otherwise not appear in the generic. The view of this type may be
666 -- different between generic and instantiation, and the full view can be
667 -- installed before the instantiation is analyzed. For aggregates of type
668 -- extensions, the same view exchange may have to be performed for some of
669 -- the ancestor types, if their view is private at the point of
672 -- Nodes that are selected components in the parse tree may be rewritten
673 -- as expanded names after resolution, and must be treated as potential
674 -- entity holders, which is why they also have an Associated_Node.
676 -- Nodes that do not come from source, such as freeze nodes, do not appear
677 -- in the generic tree, and need not have an associated node.
679 -- The associated node is stored in the Associated_Node field. Note that
680 -- this field overlaps Entity, which is fine, because the whole point is
681 -- that we don't need or want the normal Entity field in this situation.
683 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
684 -- Within the generic part, entities in the formal package are
685 -- visible. To validate subsequent type declarations, indicate
686 -- the correspondence between the entities in the analyzed formal,
687 -- and the entities in the actual package. There are three packages
688 -- involved in the instantiation of a formal package: the parent
689 -- generic P1 which appears in the generic declaration, the fake
690 -- instantiation P2 which appears in the analyzed generic, and whose
691 -- visible entities may be used in subsequent formals, and the actual
692 -- P3 in the instance. To validate subsequent formals, me indicate
693 -- that the entities in P2 are mapped into those of P3. The mapping of
694 -- entities has to be done recursively for nested packages.
696 procedure Move_Freeze_Nodes
700 -- Freeze nodes can be generated in the analysis of a generic unit, but
701 -- will not be seen by the back-end. It is necessary to move those nodes
702 -- to the enclosing scope if they freeze an outer entity. We place them
703 -- at the end of the enclosing generic package, which is semantically
706 procedure Preanalyze_Actuals (N : Node_Id);
707 -- Analyze actuals to perform name resolution. Full resolution is done
708 -- later, when the expected types are known, but names have to be captured
709 -- before installing parents of generics, that are not visible for the
710 -- actuals themselves.
712 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
713 -- Verify that an attribute that appears as the default for a formal
714 -- subprogram is a function or procedure with the correct profile.
716 -------------------------------------------
717 -- Data Structures for Generic Renamings --
718 -------------------------------------------
720 -- The map Generic_Renamings associates generic entities with their
721 -- corresponding actuals. Currently used to validate type instances. It
722 -- will eventually be used for all generic parameters to eliminate the
723 -- need for overload resolution in the instance.
725 type Assoc_Ptr is new Int;
727 Assoc_Null : constant Assoc_Ptr := -1;
732 Next_In_HTable : Assoc_Ptr;
735 package Generic_Renamings is new Table.Table
736 (Table_Component_Type => Assoc,
737 Table_Index_Type => Assoc_Ptr,
738 Table_Low_Bound => 0,
740 Table_Increment => 100,
741 Table_Name => "Generic_Renamings");
743 -- Variable to hold enclosing instantiation. When the environment is
744 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
746 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
748 -- Hash table for associations
750 HTable_Size : constant := 37;
751 type HTable_Range is range 0 .. HTable_Size - 1;
753 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
754 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
755 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
756 function Hash (F : Entity_Id) return HTable_Range;
758 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
759 Header_Num => HTable_Range,
761 Elmt_Ptr => Assoc_Ptr,
762 Null_Ptr => Assoc_Null,
763 Set_Next => Set_Next_Assoc,
766 Get_Key => Get_Gen_Id,
770 Exchanged_Views : Elist_Id;
771 -- This list holds the private views that have been exchanged during
772 -- instantiation to restore the visibility of the generic declaration.
773 -- (see comments above). After instantiation, the current visibility is
774 -- reestablished by means of a traversal of this list.
776 Hidden_Entities : Elist_Id;
777 -- This list holds the entities of the current scope that are removed
778 -- from immediate visibility when instantiating a child unit. Their
779 -- visibility is restored in Remove_Parent.
781 -- Because instantiations can be recursive, the following must be saved
782 -- on entry and restored on exit from an instantiation (spec or body).
783 -- This is done by the two procedures Save_Env and Restore_Env. For
784 -- package and subprogram instantiations (but not for the body instances)
785 -- the action of Save_Env is done in two steps: Init_Env is called before
786 -- Check_Generic_Child_Unit, because setting the parent instances requires
787 -- that the visibility data structures be properly initialized. Once the
788 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
790 Parent_Unit_Visible : Boolean := False;
791 -- Parent_Unit_Visible is used when the generic is a child unit, and
792 -- indicates whether the ultimate parent of the generic is visible in the
793 -- instantiation environment. It is used to reset the visibility of the
794 -- parent at the end of the instantiation (see Remove_Parent).
796 Instance_Parent_Unit : Entity_Id := Empty;
797 -- This records the ultimate parent unit of an instance of a generic
798 -- child unit and is used in conjunction with Parent_Unit_Visible to
799 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
801 type Instance_Env is record
802 Instantiated_Parent : Assoc;
803 Exchanged_Views : Elist_Id;
804 Hidden_Entities : Elist_Id;
805 Current_Sem_Unit : Unit_Number_Type;
806 Parent_Unit_Visible : Boolean := False;
807 Instance_Parent_Unit : Entity_Id := Empty;
808 Switches : Config_Switches_Type;
811 package Instance_Envs is new Table.Table (
812 Table_Component_Type => Instance_Env,
813 Table_Index_Type => Int,
814 Table_Low_Bound => 0,
816 Table_Increment => 100,
817 Table_Name => "Instance_Envs");
819 procedure Restore_Private_Views
820 (Pack_Id : Entity_Id;
821 Is_Package : Boolean := True);
822 -- Restore the private views of external types, and unmark the generic
823 -- renamings of actuals, so that they become compatible subtypes again.
824 -- For subprograms, Pack_Id is the package constructed to hold the
827 procedure Switch_View (T : Entity_Id);
828 -- Switch the partial and full views of a type and its private
829 -- dependents (i.e. its subtypes and derived types).
831 ------------------------------------
832 -- Structures for Error Reporting --
833 ------------------------------------
835 Instantiation_Node : Node_Id;
836 -- Used by subprograms that validate instantiation of formal parameters
837 -- where there might be no actual on which to place the error message.
838 -- Also used to locate the instantiation node for generic subunits.
840 Instantiation_Error : exception;
841 -- When there is a semantic error in the generic parameter matching,
842 -- there is no point in continuing the instantiation, because the
843 -- number of cascaded errors is unpredictable. This exception aborts
844 -- the instantiation process altogether.
846 S_Adjustment : Sloc_Adjustment;
847 -- Offset created for each node in an instantiation, in order to keep
848 -- track of the source position of the instantiation in each of its nodes.
849 -- A subsequent semantic error or warning on a construct of the instance
850 -- points to both places: the original generic node, and the point of
851 -- instantiation. See Sinput and Sinput.L for additional details.
853 ------------------------------------------------------------
854 -- Data structure for keeping track when inside a Generic --
855 ------------------------------------------------------------
857 -- The following table is used to save values of the Inside_A_Generic
858 -- flag (see spec of Sem) when they are saved by Start_Generic.
860 package Generic_Flags is new Table.Table (
861 Table_Component_Type => Boolean,
862 Table_Index_Type => Int,
863 Table_Low_Bound => 0,
865 Table_Increment => 200,
866 Table_Name => "Generic_Flags");
868 ---------------------------
869 -- Abandon_Instantiation --
870 ---------------------------
872 procedure Abandon_Instantiation (N : Node_Id) is
874 Error_Msg_N ("\instantiation abandoned!", N);
875 raise Instantiation_Error;
876 end Abandon_Instantiation;
878 --------------------------
879 -- Analyze_Associations --
880 --------------------------
882 function Analyze_Associations
885 F_Copy : List_Id) return List_Id
888 Actual_Types : constant Elist_Id := New_Elmt_List;
889 Assoc : constant List_Id := New_List;
890 Default_Actuals : constant Elist_Id := New_Elmt_List;
891 Gen_Unit : constant Entity_Id :=
892 Defining_Entity (Parent (F_Copy));
897 Next_Formal : Node_Id;
898 Analyzed_Formal : Node_Id;
901 First_Named : Node_Id := Empty;
903 Default_Formals : constant List_Id := New_List;
904 -- If an Others_Choice is present, some of the formals may be defaulted.
905 -- To simplify the treatment of visibility in an instance, we introduce
906 -- individual defaults for each such formal. These defaults are
907 -- appended to the list of associations and replace the Others_Choice.
909 Found_Assoc : Node_Id;
910 -- Association for the current formal being match. Empty if there are
911 -- no remaining actuals, or if there is no named association with the
912 -- name of the formal.
914 Is_Named_Assoc : Boolean;
915 Num_Matched : Int := 0;
916 Num_Actuals : Int := 0;
918 Others_Present : Boolean := False;
919 Others_Choice : Node_Id := Empty;
920 -- In Ada 2005, indicates partial parametrization of a formal
921 -- package. As usual an other association must be last in the list.
923 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id);
924 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance
925 -- cannot have a named association for it. AI05-0025 extends this rule
926 -- to formals of formal packages by AI05-0025, and it also applies to
927 -- box-initialized formals.
929 function Matching_Actual
931 A_F : Entity_Id) return Node_Id;
932 -- Find actual that corresponds to a given a formal parameter. If the
933 -- actuals are positional, return the next one, if any. If the actuals
934 -- are named, scan the parameter associations to find the right one.
935 -- A_F is the corresponding entity in the analyzed generic,which is
936 -- placed on the selector name for ASIS use.
938 -- In Ada 2005, a named association may be given with a box, in which
939 -- case Matching_Actual sets Found_Assoc to the generic association,
940 -- but return Empty for the actual itself. In this case the code below
941 -- creates a corresponding declaration for the formal.
943 function Partial_Parametrization return Boolean;
944 -- Ada 2005: if no match is found for a given formal, check if the
945 -- association for it includes a box, or whether the associations
946 -- include an Others clause.
948 procedure Process_Default (F : Entity_Id);
949 -- Add a copy of the declaration of generic formal F to the list of
950 -- associations, and add an explicit box association for F if there
951 -- is none yet, and the default comes from an Others_Choice.
953 procedure Set_Analyzed_Formal;
954 -- Find the node in the generic copy that corresponds to a given formal.
955 -- The semantic information on this node is used to perform legality
956 -- checks on the actuals. Because semantic analysis can introduce some
957 -- anonymous entities or modify the declaration node itself, the
958 -- correspondence between the two lists is not one-one. In addition to
959 -- anonymous types, the presence a formal equality will introduce an
960 -- implicit declaration for the corresponding inequality.
962 ----------------------------------------
963 -- Check_Overloaded_Formal_Subprogram --
964 ----------------------------------------
966 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is
967 Temp_Formal : Entity_Id;
970 Temp_Formal := First (Formals);
971 while Present (Temp_Formal) loop
972 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration
973 and then Temp_Formal /= Formal
975 Chars (Defining_Unit_Name (Specification (Formal))) =
976 Chars (Defining_Unit_Name (Specification (Temp_Formal)))
978 if Present (Found_Assoc) then
980 ("named association not allowed for overloaded formal",
985 ("named association not allowed for overloaded formal",
989 Abandon_Instantiation (Instantiation_Node);
994 end Check_Overloaded_Formal_Subprogram;
996 ---------------------
997 -- Matching_Actual --
998 ---------------------
1000 function Matching_Actual
1002 A_F : Entity_Id) return Node_Id
1008 Is_Named_Assoc := False;
1010 -- End of list of purely positional parameters
1012 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
1013 Found_Assoc := Empty;
1016 -- Case of positional parameter corresponding to current formal
1018 elsif No (Selector_Name (Actual)) then
1019 Found_Assoc := Actual;
1020 Act := Explicit_Generic_Actual_Parameter (Actual);
1021 Num_Matched := Num_Matched + 1;
1024 -- Otherwise scan list of named actuals to find the one with the
1025 -- desired name. All remaining actuals have explicit names.
1028 Is_Named_Assoc := True;
1029 Found_Assoc := Empty;
1033 while Present (Actual) loop
1034 if Chars (Selector_Name (Actual)) = Chars (F) then
1035 Set_Entity (Selector_Name (Actual), A_F);
1036 Set_Etype (Selector_Name (Actual), Etype (A_F));
1037 Generate_Reference (A_F, Selector_Name (Actual));
1038 Found_Assoc := Actual;
1039 Act := Explicit_Generic_Actual_Parameter (Actual);
1040 Num_Matched := Num_Matched + 1;
1048 -- Reset for subsequent searches. In most cases the named
1049 -- associations are in order. If they are not, we reorder them
1050 -- to avoid scanning twice the same actual. This is not just a
1051 -- question of efficiency: there may be multiple defaults with
1052 -- boxes that have the same name. In a nested instantiation we
1053 -- insert actuals for those defaults, and cannot rely on their
1054 -- names to disambiguate them.
1056 if Actual = First_Named then
1059 elsif Present (Actual) then
1060 Insert_Before (First_Named, Remove_Next (Prev));
1063 Actual := First_Named;
1066 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1067 Set_Used_As_Generic_Actual (Entity (Act));
1071 end Matching_Actual;
1073 -----------------------------
1074 -- Partial_Parametrization --
1075 -----------------------------
1077 function Partial_Parametrization return Boolean is
1079 return Others_Present
1080 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1081 end Partial_Parametrization;
1083 ---------------------
1084 -- Process_Default --
1085 ---------------------
1087 procedure Process_Default (F : Entity_Id) is
1088 Loc : constant Source_Ptr := Sloc (I_Node);
1089 F_Id : constant Entity_Id := Defining_Entity (F);
1095 -- Append copy of formal declaration to associations, and create new
1096 -- defining identifier for it.
1098 Decl := New_Copy_Tree (F);
1099 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id));
1101 if Nkind (F) in N_Formal_Subprogram_Declaration then
1102 Set_Defining_Unit_Name (Specification (Decl), Id);
1105 Set_Defining_Identifier (Decl, Id);
1108 Append (Decl, Assoc);
1110 if No (Found_Assoc) then
1112 Make_Generic_Association (Loc,
1113 Selector_Name => New_Occurrence_Of (Id, Loc),
1114 Explicit_Generic_Actual_Parameter => Empty);
1115 Set_Box_Present (Default);
1116 Append (Default, Default_Formals);
1118 end Process_Default;
1120 -------------------------
1121 -- Set_Analyzed_Formal --
1122 -------------------------
1124 procedure Set_Analyzed_Formal is
1128 while Present (Analyzed_Formal) loop
1129 Kind := Nkind (Analyzed_Formal);
1131 case Nkind (Formal) is
1133 when N_Formal_Subprogram_Declaration =>
1134 exit when Kind in N_Formal_Subprogram_Declaration
1137 (Defining_Unit_Name (Specification (Formal))) =
1139 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1141 when N_Formal_Package_Declaration =>
1142 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1143 N_Generic_Package_Declaration,
1144 N_Package_Declaration);
1146 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1150 -- Skip freeze nodes, and nodes inserted to replace
1151 -- unrecognized pragmas.
1154 Kind not in N_Formal_Subprogram_Declaration
1155 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1159 and then Chars (Defining_Identifier (Formal)) =
1160 Chars (Defining_Identifier (Analyzed_Formal));
1163 Next (Analyzed_Formal);
1165 end Set_Analyzed_Formal;
1167 -- Start of processing for Analyze_Associations
1170 Actuals := Generic_Associations (I_Node);
1172 if Present (Actuals) then
1174 -- Check for an Others choice, indicating a partial parametrization
1175 -- for a formal package.
1177 Actual := First (Actuals);
1178 while Present (Actual) loop
1179 if Nkind (Actual) = N_Others_Choice then
1180 Others_Present := True;
1181 Others_Choice := Actual;
1183 if Present (Next (Actual)) then
1184 Error_Msg_N ("others must be last association", Actual);
1187 -- This subprogram is used both for formal packages and for
1188 -- instantiations. For the latter, associations must all be
1191 if Nkind (I_Node) /= N_Formal_Package_Declaration
1192 and then Comes_From_Source (I_Node)
1195 ("others association not allowed in an instance",
1199 -- In any case, nothing to do after the others association
1203 elsif Box_Present (Actual)
1204 and then Comes_From_Source (I_Node)
1205 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1208 ("box association not allowed in an instance", Actual);
1214 -- If named associations are present, save first named association
1215 -- (it may of course be Empty) to facilitate subsequent name search.
1217 First_Named := First (Actuals);
1218 while Present (First_Named)
1219 and then Nkind (First_Named) /= N_Others_Choice
1220 and then No (Selector_Name (First_Named))
1222 Num_Actuals := Num_Actuals + 1;
1227 Named := First_Named;
1228 while Present (Named) loop
1229 if Nkind (Named) /= N_Others_Choice
1230 and then No (Selector_Name (Named))
1232 Error_Msg_N ("invalid positional actual after named one", Named);
1233 Abandon_Instantiation (Named);
1236 -- A named association may lack an actual parameter, if it was
1237 -- introduced for a default subprogram that turns out to be local
1238 -- to the outer instantiation.
1240 if Nkind (Named) /= N_Others_Choice
1241 and then Present (Explicit_Generic_Actual_Parameter (Named))
1243 Num_Actuals := Num_Actuals + 1;
1249 if Present (Formals) then
1250 Formal := First_Non_Pragma (Formals);
1251 Analyzed_Formal := First_Non_Pragma (F_Copy);
1253 if Present (Actuals) then
1254 Actual := First (Actuals);
1256 -- All formals should have default values
1262 while Present (Formal) loop
1263 Set_Analyzed_Formal;
1264 Next_Formal := Next_Non_Pragma (Formal);
1266 case Nkind (Formal) is
1267 when N_Formal_Object_Declaration =>
1270 Defining_Identifier (Formal),
1271 Defining_Identifier (Analyzed_Formal));
1273 if No (Match) and then Partial_Parametrization then
1274 Process_Default (Formal);
1277 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1281 when N_Formal_Type_Declaration =>
1284 Defining_Identifier (Formal),
1285 Defining_Identifier (Analyzed_Formal));
1288 if Partial_Parametrization then
1289 Process_Default (Formal);
1292 Error_Msg_Sloc := Sloc (Gen_Unit);
1296 Defining_Identifier (Formal));
1297 Error_Msg_NE ("\in instantiation of & declared#",
1298 Instantiation_Node, Gen_Unit);
1299 Abandon_Instantiation (Instantiation_Node);
1306 (Formal, Match, Analyzed_Formal, Assoc),
1309 -- An instantiation is a freeze point for the actuals,
1310 -- unless this is a rewritten formal package, or the
1311 -- formal is an Ada 2012 formal incomplete type.
1313 if Nkind (I_Node) /= N_Formal_Package_Declaration
1315 Ekind (Defining_Identifier (Analyzed_Formal)) /=
1318 Append_Elmt (Entity (Match), Actual_Types);
1322 -- A remote access-to-class-wide type is not a legal actual
1323 -- for a generic formal of an access type (E.2.2(17)).
1325 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1327 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1328 N_Access_To_Object_Definition
1330 Validate_Remote_Access_To_Class_Wide_Type (Match);
1333 when N_Formal_Subprogram_Declaration =>
1336 Defining_Unit_Name (Specification (Formal)),
1337 Defining_Unit_Name (Specification (Analyzed_Formal)));
1339 -- If the formal subprogram has the same name as another
1340 -- formal subprogram of the generic, then a named
1341 -- association is illegal (12.3(9)). Exclude named
1342 -- associations that are generated for a nested instance.
1345 and then Is_Named_Assoc
1346 and then Comes_From_Source (Found_Assoc)
1348 Check_Overloaded_Formal_Subprogram (Formal);
1351 -- If there is no corresponding actual, this may be case of
1352 -- partial parametrization, or else the formal has a default
1356 and then Partial_Parametrization
1358 Process_Default (Formal);
1359 if Nkind (I_Node) = N_Formal_Package_Declaration then
1360 Check_Overloaded_Formal_Subprogram (Formal);
1365 Instantiate_Formal_Subprogram
1366 (Formal, Match, Analyzed_Formal));
1369 -- If this is a nested generic, preserve default for later
1373 and then Box_Present (Formal)
1376 (Defining_Unit_Name (Specification (Last (Assoc))),
1380 when N_Formal_Package_Declaration =>
1383 Defining_Identifier (Formal),
1384 Defining_Identifier (Original_Node (Analyzed_Formal)));
1387 if Partial_Parametrization then
1388 Process_Default (Formal);
1391 Error_Msg_Sloc := Sloc (Gen_Unit);
1394 Instantiation_Node, Defining_Identifier (Formal));
1395 Error_Msg_NE ("\in instantiation of & declared#",
1396 Instantiation_Node, Gen_Unit);
1398 Abandon_Instantiation (Instantiation_Node);
1404 (Instantiate_Formal_Package
1405 (Formal, Match, Analyzed_Formal),
1409 -- For use type and use package appearing in the generic part,
1410 -- we have already copied them, so we can just move them where
1411 -- they belong (we mustn't recopy them since this would mess up
1412 -- the Sloc values).
1414 when N_Use_Package_Clause |
1415 N_Use_Type_Clause =>
1416 if Nkind (Original_Node (I_Node)) =
1417 N_Formal_Package_Declaration
1419 Append (New_Copy_Tree (Formal), Assoc);
1422 Append (Formal, Assoc);
1426 raise Program_Error;
1430 Formal := Next_Formal;
1431 Next_Non_Pragma (Analyzed_Formal);
1434 if Num_Actuals > Num_Matched then
1435 Error_Msg_Sloc := Sloc (Gen_Unit);
1437 if Present (Selector_Name (Actual)) then
1439 ("unmatched actual&",
1440 Actual, Selector_Name (Actual));
1441 Error_Msg_NE ("\in instantiation of& declared#",
1445 ("unmatched actual in instantiation of& declared#",
1450 elsif Present (Actuals) then
1452 ("too many actuals in generic instantiation", Instantiation_Node);
1456 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1458 while Present (Elmt) loop
1459 Freeze_Before (I_Node, Node (Elmt));
1464 -- If there are default subprograms, normalize the tree by adding
1465 -- explicit associations for them. This is required if the instance
1466 -- appears within a generic.
1474 Elmt := First_Elmt (Default_Actuals);
1475 while Present (Elmt) loop
1476 if No (Actuals) then
1477 Actuals := New_List;
1478 Set_Generic_Associations (I_Node, Actuals);
1481 Subp := Node (Elmt);
1483 Make_Generic_Association (Sloc (Subp),
1484 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1485 Explicit_Generic_Actual_Parameter =>
1486 New_Occurrence_Of (Subp, Sloc (Subp)));
1487 Mark_Rewrite_Insertion (New_D);
1488 Append_To (Actuals, New_D);
1493 -- If this is a formal package, normalize the parameter list by adding
1494 -- explicit box associations for the formals that are covered by an
1497 if not Is_Empty_List (Default_Formals) then
1498 Append_List (Default_Formals, Formals);
1502 end Analyze_Associations;
1504 -------------------------------
1505 -- Analyze_Formal_Array_Type --
1506 -------------------------------
1508 procedure Analyze_Formal_Array_Type
1509 (T : in out Entity_Id;
1515 -- Treated like a non-generic array declaration, with additional
1520 if Nkind (Def) = N_Constrained_Array_Definition then
1521 DSS := First (Discrete_Subtype_Definitions (Def));
1522 while Present (DSS) loop
1523 if Nkind_In (DSS, N_Subtype_Indication,
1525 N_Attribute_Reference)
1527 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1534 Array_Type_Declaration (T, Def);
1535 Set_Is_Generic_Type (Base_Type (T));
1537 if Ekind (Component_Type (T)) = E_Incomplete_Type
1538 and then No (Full_View (Component_Type (T)))
1540 Error_Msg_N ("premature usage of incomplete type", Def);
1542 -- Check that range constraint is not allowed on the component type
1543 -- of a generic formal array type (AARM 12.5.3(3))
1545 elsif Is_Internal (Component_Type (T))
1546 and then Present (Subtype_Indication (Component_Definition (Def)))
1547 and then Nkind (Original_Node
1548 (Subtype_Indication (Component_Definition (Def)))) =
1549 N_Subtype_Indication
1552 ("in a formal, a subtype indication can only be "
1553 & "a subtype mark (RM 12.5.3(3))",
1554 Subtype_Indication (Component_Definition (Def)));
1557 end Analyze_Formal_Array_Type;
1559 ---------------------------------------------
1560 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1561 ---------------------------------------------
1563 -- As for other generic types, we create a valid type representation with
1564 -- legal but arbitrary attributes, whose values are never considered
1565 -- static. For all scalar types we introduce an anonymous base type, with
1566 -- the same attributes. We choose the corresponding integer type to be
1567 -- Standard_Integer.
1569 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1573 Loc : constant Source_Ptr := Sloc (Def);
1574 Base : constant Entity_Id :=
1576 (E_Decimal_Fixed_Point_Type,
1577 Current_Scope, Sloc (Def), 'G');
1578 Int_Base : constant Entity_Id := Standard_Integer;
1579 Delta_Val : constant Ureal := Ureal_1;
1580 Digs_Val : constant Uint := Uint_6;
1585 Set_Etype (Base, Base);
1586 Set_Size_Info (Base, Int_Base);
1587 Set_RM_Size (Base, RM_Size (Int_Base));
1588 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1589 Set_Digits_Value (Base, Digs_Val);
1590 Set_Delta_Value (Base, Delta_Val);
1591 Set_Small_Value (Base, Delta_Val);
1592 Set_Scalar_Range (Base,
1594 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1595 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1597 Set_Is_Generic_Type (Base);
1598 Set_Parent (Base, Parent (Def));
1600 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1601 Set_Etype (T, Base);
1602 Set_Size_Info (T, Int_Base);
1603 Set_RM_Size (T, RM_Size (Int_Base));
1604 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1605 Set_Digits_Value (T, Digs_Val);
1606 Set_Delta_Value (T, Delta_Val);
1607 Set_Small_Value (T, Delta_Val);
1608 Set_Scalar_Range (T, Scalar_Range (Base));
1609 Set_Is_Constrained (T);
1611 Check_Restriction (No_Fixed_Point, Def);
1612 end Analyze_Formal_Decimal_Fixed_Point_Type;
1614 -------------------------------------------
1615 -- Analyze_Formal_Derived_Interface_Type --
1616 -------------------------------------------
1618 procedure Analyze_Formal_Derived_Interface_Type
1623 Loc : constant Source_Ptr := Sloc (Def);
1626 -- Rewrite as a type declaration of a derived type. This ensures that
1627 -- the interface list and primitive operations are properly captured.
1630 Make_Full_Type_Declaration (Loc,
1631 Defining_Identifier => T,
1632 Type_Definition => Def));
1634 Set_Is_Generic_Type (T);
1635 end Analyze_Formal_Derived_Interface_Type;
1637 ---------------------------------
1638 -- Analyze_Formal_Derived_Type --
1639 ---------------------------------
1641 procedure Analyze_Formal_Derived_Type
1646 Loc : constant Source_Ptr := Sloc (Def);
1647 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1651 Set_Is_Generic_Type (T);
1653 if Private_Present (Def) then
1655 Make_Private_Extension_Declaration (Loc,
1656 Defining_Identifier => T,
1657 Discriminant_Specifications => Discriminant_Specifications (N),
1658 Unknown_Discriminants_Present => Unk_Disc,
1659 Subtype_Indication => Subtype_Mark (Def),
1660 Interface_List => Interface_List (Def));
1662 Set_Abstract_Present (New_N, Abstract_Present (Def));
1663 Set_Limited_Present (New_N, Limited_Present (Def));
1664 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1668 Make_Full_Type_Declaration (Loc,
1669 Defining_Identifier => T,
1670 Discriminant_Specifications =>
1671 Discriminant_Specifications (Parent (T)),
1673 Make_Derived_Type_Definition (Loc,
1674 Subtype_Indication => Subtype_Mark (Def)));
1676 Set_Abstract_Present
1677 (Type_Definition (New_N), Abstract_Present (Def));
1679 (Type_Definition (New_N), Limited_Present (Def));
1686 if not Is_Composite_Type (T) then
1688 ("unknown discriminants not allowed for elementary types", N);
1690 Set_Has_Unknown_Discriminants (T);
1691 Set_Is_Constrained (T, False);
1695 -- If the parent type has a known size, so does the formal, which makes
1696 -- legal representation clauses that involve the formal.
1698 Set_Size_Known_At_Compile_Time
1699 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1700 end Analyze_Formal_Derived_Type;
1702 ----------------------------------
1703 -- Analyze_Formal_Discrete_Type --
1704 ----------------------------------
1706 -- The operations defined for a discrete types are those of an enumeration
1707 -- type. The size is set to an arbitrary value, for use in analyzing the
1710 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1711 Loc : constant Source_Ptr := Sloc (Def);
1715 Base : constant Entity_Id :=
1717 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1720 Set_Ekind (T, E_Enumeration_Subtype);
1721 Set_Etype (T, Base);
1724 Set_Is_Generic_Type (T);
1725 Set_Is_Constrained (T);
1727 -- For semantic analysis, the bounds of the type must be set to some
1728 -- non-static value. The simplest is to create attribute nodes for those
1729 -- bounds, that refer to the type itself. These bounds are never
1730 -- analyzed but serve as place-holders.
1733 Make_Attribute_Reference (Loc,
1734 Attribute_Name => Name_First,
1735 Prefix => New_Reference_To (T, Loc));
1739 Make_Attribute_Reference (Loc,
1740 Attribute_Name => Name_Last,
1741 Prefix => New_Reference_To (T, Loc));
1744 Set_Scalar_Range (T,
1749 Set_Ekind (Base, E_Enumeration_Type);
1750 Set_Etype (Base, Base);
1751 Init_Size (Base, 8);
1752 Init_Alignment (Base);
1753 Set_Is_Generic_Type (Base);
1754 Set_Scalar_Range (Base, Scalar_Range (T));
1755 Set_Parent (Base, Parent (Def));
1756 end Analyze_Formal_Discrete_Type;
1758 ----------------------------------
1759 -- Analyze_Formal_Floating_Type --
1760 ---------------------------------
1762 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1763 Base : constant Entity_Id :=
1765 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1768 -- The various semantic attributes are taken from the predefined type
1769 -- Float, just so that all of them are initialized. Their values are
1770 -- never used because no constant folding or expansion takes place in
1771 -- the generic itself.
1774 Set_Ekind (T, E_Floating_Point_Subtype);
1775 Set_Etype (T, Base);
1776 Set_Size_Info (T, (Standard_Float));
1777 Set_RM_Size (T, RM_Size (Standard_Float));
1778 Set_Digits_Value (T, Digits_Value (Standard_Float));
1779 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1780 Set_Is_Constrained (T);
1782 Set_Is_Generic_Type (Base);
1783 Set_Etype (Base, Base);
1784 Set_Size_Info (Base, (Standard_Float));
1785 Set_RM_Size (Base, RM_Size (Standard_Float));
1786 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1787 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1788 Set_Parent (Base, Parent (Def));
1790 Check_Restriction (No_Floating_Point, Def);
1791 end Analyze_Formal_Floating_Type;
1793 -----------------------------------
1794 -- Analyze_Formal_Interface_Type;--
1795 -----------------------------------
1797 procedure Analyze_Formal_Interface_Type
1802 Loc : constant Source_Ptr := Sloc (N);
1807 Make_Full_Type_Declaration (Loc,
1808 Defining_Identifier => T,
1809 Type_Definition => Def);
1813 Set_Is_Generic_Type (T);
1814 end Analyze_Formal_Interface_Type;
1816 ---------------------------------
1817 -- Analyze_Formal_Modular_Type --
1818 ---------------------------------
1820 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1822 -- Apart from their entity kind, generic modular types are treated like
1823 -- signed integer types, and have the same attributes.
1825 Analyze_Formal_Signed_Integer_Type (T, Def);
1826 Set_Ekind (T, E_Modular_Integer_Subtype);
1827 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1829 end Analyze_Formal_Modular_Type;
1831 ---------------------------------------
1832 -- Analyze_Formal_Object_Declaration --
1833 ---------------------------------------
1835 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1836 E : constant Node_Id := Default_Expression (N);
1837 Id : constant Node_Id := Defining_Identifier (N);
1844 -- Determine the mode of the formal object
1846 if Out_Present (N) then
1847 K := E_Generic_In_Out_Parameter;
1849 if not In_Present (N) then
1850 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1854 K := E_Generic_In_Parameter;
1857 if Present (Subtype_Mark (N)) then
1858 Find_Type (Subtype_Mark (N));
1859 T := Entity (Subtype_Mark (N));
1861 -- Verify that there is no redundant null exclusion
1863 if Null_Exclusion_Present (N) then
1864 if not Is_Access_Type (T) then
1866 ("null exclusion can only apply to an access type", N);
1868 elsif Can_Never_Be_Null (T) then
1870 ("`NOT NULL` not allowed (& already excludes null)",
1875 -- Ada 2005 (AI-423): Formal object with an access definition
1878 Check_Access_Definition (N);
1879 T := Access_Definition
1881 N => Access_Definition (N));
1884 if Ekind (T) = E_Incomplete_Type then
1886 Error_Node : Node_Id;
1889 if Present (Subtype_Mark (N)) then
1890 Error_Node := Subtype_Mark (N);
1892 Check_Access_Definition (N);
1893 Error_Node := Access_Definition (N);
1896 Error_Msg_N ("premature usage of incomplete type", Error_Node);
1900 if K = E_Generic_In_Parameter then
1902 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1904 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
1906 ("generic formal of mode IN must not be of limited type", N);
1907 Explain_Limited_Type (T, N);
1910 if Is_Abstract_Type (T) then
1912 ("generic formal of mode IN must not be of abstract type", N);
1916 Preanalyze_Spec_Expression (E, T);
1918 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
1920 ("initialization not allowed for limited types", E);
1921 Explain_Limited_Type (T, E);
1928 -- Case of generic IN OUT parameter
1931 -- If the formal has an unconstrained type, construct its actual
1932 -- subtype, as is done for subprogram formals. In this fashion, all
1933 -- its uses can refer to specific bounds.
1938 if (Is_Array_Type (T)
1939 and then not Is_Constrained (T))
1941 (Ekind (T) = E_Record_Type
1942 and then Has_Discriminants (T))
1945 Non_Freezing_Ref : constant Node_Id :=
1946 New_Reference_To (Id, Sloc (Id));
1950 -- Make sure the actual subtype doesn't generate bogus freezing
1952 Set_Must_Not_Freeze (Non_Freezing_Ref);
1953 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1954 Insert_Before_And_Analyze (N, Decl);
1955 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1958 Set_Actual_Subtype (Id, T);
1963 ("initialization not allowed for `IN OUT` formals", N);
1967 if Has_Aspects (N) then
1968 Analyze_Aspect_Specifications (N, Id);
1970 end Analyze_Formal_Object_Declaration;
1972 ----------------------------------------------
1973 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1974 ----------------------------------------------
1976 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1980 Loc : constant Source_Ptr := Sloc (Def);
1981 Base : constant Entity_Id :=
1983 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1985 -- The semantic attributes are set for completeness only, their values
1986 -- will never be used, since all properties of the type are non-static.
1989 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1990 Set_Etype (T, Base);
1991 Set_Size_Info (T, Standard_Integer);
1992 Set_RM_Size (T, RM_Size (Standard_Integer));
1993 Set_Small_Value (T, Ureal_1);
1994 Set_Delta_Value (T, Ureal_1);
1995 Set_Scalar_Range (T,
1997 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1998 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1999 Set_Is_Constrained (T);
2001 Set_Is_Generic_Type (Base);
2002 Set_Etype (Base, Base);
2003 Set_Size_Info (Base, Standard_Integer);
2004 Set_RM_Size (Base, RM_Size (Standard_Integer));
2005 Set_Small_Value (Base, Ureal_1);
2006 Set_Delta_Value (Base, Ureal_1);
2007 Set_Scalar_Range (Base, Scalar_Range (T));
2008 Set_Parent (Base, Parent (Def));
2010 Check_Restriction (No_Fixed_Point, Def);
2011 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2013 ----------------------------------------
2014 -- Analyze_Formal_Package_Declaration --
2015 ----------------------------------------
2017 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2018 Loc : constant Source_Ptr := Sloc (N);
2019 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2021 Gen_Id : constant Node_Id := Name (N);
2023 Gen_Unit : Entity_Id;
2025 Parent_Installed : Boolean := False;
2027 Parent_Instance : Entity_Id;
2028 Renaming_In_Par : Entity_Id;
2029 Associations : Boolean := True;
2031 function Build_Local_Package return Node_Id;
2032 -- The formal package is rewritten so that its parameters are replaced
2033 -- with corresponding declarations. For parameters with bona fide
2034 -- associations these declarations are created by Analyze_Associations
2035 -- as for a regular instantiation. For boxed parameters, we preserve
2036 -- the formal declarations and analyze them, in order to introduce
2037 -- entities of the right kind in the environment of the formal.
2039 -------------------------
2040 -- Build_Local_Package --
2041 -------------------------
2043 function Build_Local_Package return Node_Id is
2045 Pack_Decl : Node_Id;
2048 -- Within the formal, the name of the generic package is a renaming
2049 -- of the formal (as for a regular instantiation).
2052 Make_Package_Declaration (Loc,
2055 (Specification (Original_Node (Gen_Decl)),
2056 Empty, Instantiating => True));
2058 Renaming := Make_Package_Renaming_Declaration (Loc,
2059 Defining_Unit_Name =>
2060 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2061 Name => New_Occurrence_Of (Formal, Loc));
2063 if Nkind (Gen_Id) = N_Identifier
2064 and then Chars (Gen_Id) = Chars (Pack_Id)
2067 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2070 -- If the formal is declared with a box, or with an others choice,
2071 -- create corresponding declarations for all entities in the formal
2072 -- part, so that names with the proper types are available in the
2073 -- specification of the formal package.
2075 -- On the other hand, if there are no associations, then all the
2076 -- formals must have defaults, and this will be checked by the
2077 -- call to Analyze_Associations.
2080 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2083 Formal_Decl : Node_Id;
2086 -- TBA : for a formal package, need to recurse ???
2091 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2092 while Present (Formal_Decl) loop
2094 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2099 -- If generic associations are present, use Analyze_Associations to
2100 -- create the proper renaming declarations.
2104 Act_Tree : constant Node_Id :=
2106 (Original_Node (Gen_Decl), Empty,
2107 Instantiating => True);
2110 Generic_Renamings.Set_Last (0);
2111 Generic_Renamings_HTable.Reset;
2112 Instantiation_Node := N;
2115 Analyze_Associations
2117 Generic_Formal_Declarations (Act_Tree),
2118 Generic_Formal_Declarations (Gen_Decl));
2122 Append (Renaming, To => Decls);
2124 -- Add generated declarations ahead of local declarations in
2127 if No (Visible_Declarations (Specification (Pack_Decl))) then
2128 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2131 (First (Visible_Declarations (Specification (Pack_Decl))),
2136 end Build_Local_Package;
2138 -- Start of processing for Analyze_Formal_Package_Declaration
2141 Text_IO_Kludge (Gen_Id);
2144 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2145 Gen_Unit := Entity (Gen_Id);
2147 -- Check for a formal package that is a package renaming
2149 if Present (Renamed_Object (Gen_Unit)) then
2151 -- Indicate that unit is used, before replacing it with renamed
2152 -- entity for use below.
2154 if In_Extended_Main_Source_Unit (N) then
2155 Set_Is_Instantiated (Gen_Unit);
2156 Generate_Reference (Gen_Unit, N);
2159 Gen_Unit := Renamed_Object (Gen_Unit);
2162 if Ekind (Gen_Unit) /= E_Generic_Package then
2163 Error_Msg_N ("expect generic package name", Gen_Id);
2167 elsif Gen_Unit = Current_Scope then
2169 ("generic package cannot be used as a formal package of itself",
2174 elsif In_Open_Scopes (Gen_Unit) then
2175 if Is_Compilation_Unit (Gen_Unit)
2176 and then Is_Child_Unit (Current_Scope)
2178 -- Special-case the error when the formal is a parent, and
2179 -- continue analysis to minimize cascaded errors.
2182 ("generic parent cannot be used as formal package "
2183 & "of a child unit",
2188 ("generic package cannot be used as a formal package "
2196 -- Check that name of formal package does not hide name of generic,
2197 -- or its leading prefix. This check must be done separately because
2198 -- the name of the generic has already been analyzed.
2201 Gen_Name : Entity_Id;
2205 while Nkind (Gen_Name) = N_Expanded_Name loop
2206 Gen_Name := Prefix (Gen_Name);
2209 if Chars (Gen_Name) = Chars (Pack_Id) then
2211 ("& is hidden within declaration of formal package",
2217 or else No (Generic_Associations (N))
2218 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2220 Associations := False;
2223 -- If there are no generic associations, the generic parameters appear
2224 -- as local entities and are instantiated like them. We copy the generic
2225 -- package declaration as if it were an instantiation, and analyze it
2226 -- like a regular package, except that we treat the formals as
2227 -- additional visible components.
2229 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2231 if In_Extended_Main_Source_Unit (N) then
2232 Set_Is_Instantiated (Gen_Unit);
2233 Generate_Reference (Gen_Unit, N);
2236 Formal := New_Copy (Pack_Id);
2237 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2240 -- Make local generic without formals. The formals will be replaced
2241 -- with internal declarations.
2243 New_N := Build_Local_Package;
2245 -- If there are errors in the parameter list, Analyze_Associations
2246 -- raises Instantiation_Error. Patch the declaration to prevent
2247 -- further exception propagation.
2250 when Instantiation_Error =>
2252 Enter_Name (Formal);
2253 Set_Ekind (Formal, E_Variable);
2254 Set_Etype (Formal, Any_Type);
2256 if Parent_Installed then
2264 Set_Defining_Unit_Name (Specification (New_N), Formal);
2265 Set_Generic_Parent (Specification (N), Gen_Unit);
2266 Set_Instance_Env (Gen_Unit, Formal);
2267 Set_Is_Generic_Instance (Formal);
2269 Enter_Name (Formal);
2270 Set_Ekind (Formal, E_Package);
2271 Set_Etype (Formal, Standard_Void_Type);
2272 Set_Inner_Instances (Formal, New_Elmt_List);
2273 Push_Scope (Formal);
2275 if Is_Child_Unit (Gen_Unit)
2276 and then Parent_Installed
2278 -- Similarly, we have to make the name of the formal visible in the
2279 -- parent instance, to resolve properly fully qualified names that
2280 -- may appear in the generic unit. The parent instance has been
2281 -- placed on the scope stack ahead of the current scope.
2283 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2286 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2287 Set_Ekind (Renaming_In_Par, E_Package);
2288 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2289 Set_Scope (Renaming_In_Par, Parent_Instance);
2290 Set_Parent (Renaming_In_Par, Parent (Formal));
2291 Set_Renamed_Object (Renaming_In_Par, Formal);
2292 Append_Entity (Renaming_In_Par, Parent_Instance);
2295 Analyze (Specification (N));
2297 -- The formals for which associations are provided are not visible
2298 -- outside of the formal package. The others are still declared by a
2299 -- formal parameter declaration.
2301 -- If there are no associations, the only local entity to hide is the
2302 -- generated package renaming itself.
2308 E := First_Entity (Formal);
2309 while Present (E) loop
2311 and then not Is_Generic_Formal (E)
2316 if Ekind (E) = E_Package
2317 and then Renamed_Entity (E) = Formal
2327 End_Package_Scope (Formal);
2329 if Parent_Installed then
2335 -- Inside the generic unit, the formal package is a regular package, but
2336 -- no body is needed for it. Note that after instantiation, the defining
2337 -- unit name we need is in the new tree and not in the original (see
2338 -- Package_Instantiation). A generic formal package is an instance, and
2339 -- can be used as an actual for an inner instance.
2341 Set_Has_Completion (Formal, True);
2343 -- Add semantic information to the original defining identifier.
2346 Set_Ekind (Pack_Id, E_Package);
2347 Set_Etype (Pack_Id, Standard_Void_Type);
2348 Set_Scope (Pack_Id, Scope (Formal));
2349 Set_Has_Completion (Pack_Id, True);
2352 if Has_Aspects (N) then
2353 Analyze_Aspect_Specifications (N, Pack_Id);
2355 end Analyze_Formal_Package_Declaration;
2357 ---------------------------------
2358 -- Analyze_Formal_Private_Type --
2359 ---------------------------------
2361 procedure Analyze_Formal_Private_Type
2367 New_Private_Type (N, T, Def);
2369 -- Set the size to an arbitrary but legal value
2371 Set_Size_Info (T, Standard_Integer);
2372 Set_RM_Size (T, RM_Size (Standard_Integer));
2373 end Analyze_Formal_Private_Type;
2375 ------------------------------------
2376 -- Analyze_Formal_Incomplete_Type --
2377 ------------------------------------
2379 procedure Analyze_Formal_Incomplete_Type
2385 Set_Ekind (T, E_Incomplete_Type);
2387 Set_Private_Dependents (T, New_Elmt_List);
2389 if Tagged_Present (Def) then
2390 Set_Is_Tagged_Type (T);
2391 Make_Class_Wide_Type (T);
2392 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2394 end Analyze_Formal_Incomplete_Type;
2396 ----------------------------------------
2397 -- Analyze_Formal_Signed_Integer_Type --
2398 ----------------------------------------
2400 procedure Analyze_Formal_Signed_Integer_Type
2404 Base : constant Entity_Id :=
2406 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
2411 Set_Ekind (T, E_Signed_Integer_Subtype);
2412 Set_Etype (T, Base);
2413 Set_Size_Info (T, Standard_Integer);
2414 Set_RM_Size (T, RM_Size (Standard_Integer));
2415 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2416 Set_Is_Constrained (T);
2418 Set_Is_Generic_Type (Base);
2419 Set_Size_Info (Base, Standard_Integer);
2420 Set_RM_Size (Base, RM_Size (Standard_Integer));
2421 Set_Etype (Base, Base);
2422 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2423 Set_Parent (Base, Parent (Def));
2424 end Analyze_Formal_Signed_Integer_Type;
2426 -------------------------------------------
2427 -- Analyze_Formal_Subprogram_Declaration --
2428 -------------------------------------------
2430 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2431 Spec : constant Node_Id := Specification (N);
2432 Def : constant Node_Id := Default_Name (N);
2433 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2441 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2442 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2446 Analyze_Subprogram_Declaration (N);
2447 Set_Is_Formal_Subprogram (Nam);
2448 Set_Has_Completion (Nam);
2450 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2451 Set_Is_Abstract_Subprogram (Nam);
2452 Set_Is_Dispatching_Operation (Nam);
2455 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2457 if No (Ctrl_Type) then
2459 ("abstract formal subprogram must have a controlling type",
2462 Check_Controlling_Formals (Ctrl_Type, Nam);
2467 -- Default name is resolved at the point of instantiation
2469 if Box_Present (N) then
2472 -- Else default is bound at the point of generic declaration
2474 elsif Present (Def) then
2475 if Nkind (Def) = N_Operator_Symbol then
2476 Find_Direct_Name (Def);
2478 elsif Nkind (Def) /= N_Attribute_Reference then
2482 -- For an attribute reference, analyze the prefix and verify
2483 -- that it has the proper profile for the subprogram.
2485 Analyze (Prefix (Def));
2486 Valid_Default_Attribute (Nam, Def);
2490 -- Default name may be overloaded, in which case the interpretation
2491 -- with the correct profile must be selected, as for a renaming.
2492 -- If the definition is an indexed component, it must denote a
2493 -- member of an entry family. If it is a selected component, it
2494 -- can be a protected operation.
2496 if Etype (Def) = Any_Type then
2499 elsif Nkind (Def) = N_Selected_Component then
2500 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2501 Error_Msg_N ("expect valid subprogram name as default", Def);
2504 elsif Nkind (Def) = N_Indexed_Component then
2505 if Is_Entity_Name (Prefix (Def)) then
2506 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2507 Error_Msg_N ("expect valid subprogram name as default", Def);
2510 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2511 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2514 Error_Msg_N ("expect valid subprogram name as default", Def);
2518 Error_Msg_N ("expect valid subprogram name as default", Def);
2522 elsif Nkind (Def) = N_Character_Literal then
2524 -- Needs some type checks: subprogram should be parameterless???
2526 Resolve (Def, (Etype (Nam)));
2528 elsif not Is_Entity_Name (Def)
2529 or else not Is_Overloadable (Entity (Def))
2531 Error_Msg_N ("expect valid subprogram name as default", Def);
2534 elsif not Is_Overloaded (Def) then
2535 Subp := Entity (Def);
2538 Error_Msg_N ("premature usage of formal subprogram", Def);
2540 elsif not Entity_Matches_Spec (Subp, Nam) then
2541 Error_Msg_N ("no visible entity matches specification", Def);
2544 -- More than one interpretation, so disambiguate as for a renaming
2549 I1 : Interp_Index := 0;
2555 Get_First_Interp (Def, I, It);
2556 while Present (It.Nam) loop
2557 if Entity_Matches_Spec (It.Nam, Nam) then
2558 if Subp /= Any_Id then
2559 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2561 if It1 = No_Interp then
2562 Error_Msg_N ("ambiguous default subprogram", Def);
2575 Get_Next_Interp (I, It);
2579 if Subp /= Any_Id then
2581 -- Subprogram found, generate reference to it
2583 Set_Entity (Def, Subp);
2584 Generate_Reference (Subp, Def);
2587 Error_Msg_N ("premature usage of formal subprogram", Def);
2589 elsif Ekind (Subp) /= E_Operator then
2590 Check_Mode_Conformant (Subp, Nam);
2594 Error_Msg_N ("no visible subprogram matches specification", N);
2600 if Has_Aspects (N) then
2601 Analyze_Aspect_Specifications (N, Nam);
2604 end Analyze_Formal_Subprogram_Declaration;
2606 -------------------------------------
2607 -- Analyze_Formal_Type_Declaration --
2608 -------------------------------------
2610 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2611 Def : constant Node_Id := Formal_Type_Definition (N);
2615 T := Defining_Identifier (N);
2617 if Present (Discriminant_Specifications (N))
2618 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2621 ("discriminants not allowed for this formal type", T);
2624 -- Enter the new name, and branch to specific routine
2627 when N_Formal_Private_Type_Definition =>
2628 Analyze_Formal_Private_Type (N, T, Def);
2630 when N_Formal_Derived_Type_Definition =>
2631 Analyze_Formal_Derived_Type (N, T, Def);
2633 when N_Formal_Incomplete_Type_Definition =>
2634 Analyze_Formal_Incomplete_Type (T, Def);
2636 when N_Formal_Discrete_Type_Definition =>
2637 Analyze_Formal_Discrete_Type (T, Def);
2639 when N_Formal_Signed_Integer_Type_Definition =>
2640 Analyze_Formal_Signed_Integer_Type (T, Def);
2642 when N_Formal_Modular_Type_Definition =>
2643 Analyze_Formal_Modular_Type (T, Def);
2645 when N_Formal_Floating_Point_Definition =>
2646 Analyze_Formal_Floating_Type (T, Def);
2648 when N_Formal_Ordinary_Fixed_Point_Definition =>
2649 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2651 when N_Formal_Decimal_Fixed_Point_Definition =>
2652 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2654 when N_Array_Type_Definition =>
2655 Analyze_Formal_Array_Type (T, Def);
2657 when N_Access_To_Object_Definition |
2658 N_Access_Function_Definition |
2659 N_Access_Procedure_Definition =>
2660 Analyze_Generic_Access_Type (T, Def);
2662 -- Ada 2005: a interface declaration is encoded as an abstract
2663 -- record declaration or a abstract type derivation.
2665 when N_Record_Definition =>
2666 Analyze_Formal_Interface_Type (N, T, Def);
2668 when N_Derived_Type_Definition =>
2669 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2675 raise Program_Error;
2679 Set_Is_Generic_Type (T);
2681 if Has_Aspects (N) then
2682 Analyze_Aspect_Specifications (N, T);
2684 end Analyze_Formal_Type_Declaration;
2686 ------------------------------------
2687 -- Analyze_Function_Instantiation --
2688 ------------------------------------
2690 procedure Analyze_Function_Instantiation (N : Node_Id) is
2692 Analyze_Subprogram_Instantiation (N, E_Function);
2693 end Analyze_Function_Instantiation;
2695 ---------------------------------
2696 -- Analyze_Generic_Access_Type --
2697 ---------------------------------
2699 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2703 if Nkind (Def) = N_Access_To_Object_Definition then
2704 Access_Type_Declaration (T, Def);
2706 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2707 and then No (Full_View (Designated_Type (T)))
2708 and then not Is_Generic_Type (Designated_Type (T))
2710 Error_Msg_N ("premature usage of incomplete type", Def);
2712 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2714 ("only a subtype mark is allowed in a formal", Def);
2718 Access_Subprogram_Declaration (T, Def);
2720 end Analyze_Generic_Access_Type;
2722 ---------------------------------
2723 -- Analyze_Generic_Formal_Part --
2724 ---------------------------------
2726 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2727 Gen_Parm_Decl : Node_Id;
2730 -- The generic formals are processed in the scope of the generic unit,
2731 -- where they are immediately visible. The scope is installed by the
2734 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2736 while Present (Gen_Parm_Decl) loop
2737 Analyze (Gen_Parm_Decl);
2738 Next (Gen_Parm_Decl);
2741 Generate_Reference_To_Generic_Formals (Current_Scope);
2742 end Analyze_Generic_Formal_Part;
2744 ------------------------------------------
2745 -- Analyze_Generic_Package_Declaration --
2746 ------------------------------------------
2748 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2749 Loc : constant Source_Ptr := Sloc (N);
2752 Save_Parent : Node_Id;
2754 Decls : constant List_Id :=
2755 Visible_Declarations (Specification (N));
2759 Check_SPARK_Restriction ("generic is not allowed", N);
2761 -- We introduce a renaming of the enclosing package, to have a usable
2762 -- entity as the prefix of an expanded name for a local entity of the
2763 -- form Par.P.Q, where P is the generic package. This is because a local
2764 -- entity named P may hide it, so that the usual visibility rules in
2765 -- the instance will not resolve properly.
2768 Make_Package_Renaming_Declaration (Loc,
2769 Defining_Unit_Name =>
2770 Make_Defining_Identifier (Loc,
2771 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2772 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2774 if Present (Decls) then
2775 Decl := First (Decls);
2776 while Present (Decl)
2777 and then Nkind (Decl) = N_Pragma
2782 if Present (Decl) then
2783 Insert_Before (Decl, Renaming);
2785 Append (Renaming, Visible_Declarations (Specification (N)));
2789 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2792 -- Create copy of generic unit, and save for instantiation. If the unit
2793 -- is a child unit, do not copy the specifications for the parent, which
2794 -- are not part of the generic tree.
2796 Save_Parent := Parent_Spec (N);
2797 Set_Parent_Spec (N, Empty);
2799 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2800 Set_Parent_Spec (New_N, Save_Parent);
2802 Id := Defining_Entity (N);
2803 Generate_Definition (Id);
2805 -- Expansion is not applied to generic units
2810 Set_Ekind (Id, E_Generic_Package);
2811 Set_Etype (Id, Standard_Void_Type);
2813 Enter_Generic_Scope (Id);
2814 Set_Inner_Instances (Id, New_Elmt_List);
2816 Set_Categorization_From_Pragmas (N);
2817 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2819 -- Link the declaration of the generic homonym in the generic copy to
2820 -- the package it renames, so that it is always resolved properly.
2822 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2823 Set_Entity (Associated_Node (Name (Renaming)), Id);
2825 -- For a library unit, we have reconstructed the entity for the unit,
2826 -- and must reset it in the library tables.
2828 if Nkind (Parent (N)) = N_Compilation_Unit then
2829 Set_Cunit_Entity (Current_Sem_Unit, Id);
2832 Analyze_Generic_Formal_Part (N);
2834 -- After processing the generic formals, analysis proceeds as for a
2835 -- non-generic package.
2837 Analyze (Specification (N));
2839 Validate_Categorization_Dependency (N, Id);
2843 End_Package_Scope (Id);
2844 Exit_Generic_Scope (Id);
2846 if Nkind (Parent (N)) /= N_Compilation_Unit then
2847 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2848 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2849 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2852 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2853 Validate_RT_RAT_Component (N);
2855 -- If this is a spec without a body, check that generic parameters
2858 if not Body_Required (Parent (N)) then
2859 Check_References (Id);
2863 if Has_Aspects (N) then
2864 Analyze_Aspect_Specifications (N, Id);
2866 end Analyze_Generic_Package_Declaration;
2868 --------------------------------------------
2869 -- Analyze_Generic_Subprogram_Declaration --
2870 --------------------------------------------
2872 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2877 Result_Type : Entity_Id;
2878 Save_Parent : Node_Id;
2882 Check_SPARK_Restriction ("generic is not allowed", N);
2884 -- Create copy of generic unit, and save for instantiation. If the unit
2885 -- is a child unit, do not copy the specifications for the parent, which
2886 -- are not part of the generic tree.
2888 Save_Parent := Parent_Spec (N);
2889 Set_Parent_Spec (N, Empty);
2891 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2892 Set_Parent_Spec (New_N, Save_Parent);
2895 -- The aspect specifications are not attached to the tree, and must
2896 -- be copied and attached to the generic copy explicitly.
2898 if Present (Aspect_Specifications (New_N)) then
2900 Aspects : constant List_Id := Aspect_Specifications (N);
2902 Set_Has_Aspects (N, False);
2903 Move_Aspects (New_N, N);
2904 Set_Has_Aspects (Original_Node (N), False);
2905 Set_Aspect_Specifications (Original_Node (N), Aspects);
2909 Spec := Specification (N);
2910 Id := Defining_Entity (Spec);
2911 Generate_Definition (Id);
2912 Set_Contract (Id, Make_Contract (Sloc (Id)));
2914 if Nkind (Id) = N_Defining_Operator_Symbol then
2916 ("operator symbol not allowed for generic subprogram", Id);
2923 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2925 Enter_Generic_Scope (Id);
2926 Set_Inner_Instances (Id, New_Elmt_List);
2927 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2929 Analyze_Generic_Formal_Part (N);
2931 Formals := Parameter_Specifications (Spec);
2933 if Present (Formals) then
2934 Process_Formals (Formals, Spec);
2937 if Nkind (Spec) = N_Function_Specification then
2938 Set_Ekind (Id, E_Generic_Function);
2940 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
2941 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
2942 Set_Etype (Id, Result_Type);
2944 -- Check restriction imposed by AI05-073: a generic function
2945 -- cannot return an abstract type or an access to such.
2947 -- This is a binding interpretation should it apply to earlier
2948 -- versions of Ada as well as Ada 2012???
2950 if Is_Abstract_Type (Designated_Type (Result_Type))
2951 and then Ada_Version >= Ada_2012
2953 Error_Msg_N ("generic function cannot have an access result"
2954 & " that designates an abstract type", Spec);
2958 Find_Type (Result_Definition (Spec));
2959 Typ := Entity (Result_Definition (Spec));
2961 if Is_Abstract_Type (Typ)
2962 and then Ada_Version >= Ada_2012
2965 ("generic function cannot have abstract result type", Spec);
2968 -- If a null exclusion is imposed on the result type, then create
2969 -- a null-excluding itype (an access subtype) and use it as the
2970 -- function's Etype.
2972 if Is_Access_Type (Typ)
2973 and then Null_Exclusion_Present (Spec)
2976 Create_Null_Excluding_Itype
2978 Related_Nod => Spec,
2979 Scope_Id => Defining_Unit_Name (Spec)));
2981 Set_Etype (Id, Typ);
2986 Set_Ekind (Id, E_Generic_Procedure);
2987 Set_Etype (Id, Standard_Void_Type);
2990 -- For a library unit, we have reconstructed the entity for the unit,
2991 -- and must reset it in the library tables. We also make sure that
2992 -- Body_Required is set properly in the original compilation unit node.
2994 if Nkind (Parent (N)) = N_Compilation_Unit then
2995 Set_Cunit_Entity (Current_Sem_Unit, Id);
2996 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2999 Set_Categorization_From_Pragmas (N);
3000 Validate_Categorization_Dependency (N, Id);
3002 Save_Global_References (Original_Node (N));
3004 -- To capture global references, analyze the expressions of aspects,
3005 -- and propagate information to original tree. Note that in this case
3006 -- analysis of attributes is not delayed until the freeze point.
3008 -- It seems very hard to recreate the proper visibility of the generic
3009 -- subprogram at a later point because the analysis of an aspect may
3010 -- create pragmas after the generic copies have been made ???
3012 if Has_Aspects (N) then
3017 Aspect := First (Aspect_Specifications (N));
3018 while Present (Aspect) loop
3019 if Get_Aspect_Id (Chars (Identifier (Aspect)))
3022 Analyze (Expression (Aspect));
3027 Aspect := First (Aspect_Specifications (Original_Node (N)));
3028 while Present (Aspect) loop
3029 Save_Global_References (Expression (Aspect));
3037 Exit_Generic_Scope (Id);
3038 Generate_Reference_To_Formals (Id);
3040 List_Inherited_Pre_Post_Aspects (Id);
3041 end Analyze_Generic_Subprogram_Declaration;
3043 -----------------------------------
3044 -- Analyze_Package_Instantiation --
3045 -----------------------------------
3047 procedure Analyze_Package_Instantiation (N : Node_Id) is
3048 Loc : constant Source_Ptr := Sloc (N);
3049 Gen_Id : constant Node_Id := Name (N);
3052 Act_Decl_Name : Node_Id;
3053 Act_Decl_Id : Entity_Id;
3058 Gen_Unit : Entity_Id;
3060 Is_Actual_Pack : constant Boolean :=
3061 Is_Internal (Defining_Entity (N));
3063 Env_Installed : Boolean := False;
3064 Parent_Installed : Boolean := False;
3065 Renaming_List : List_Id;
3066 Unit_Renaming : Node_Id;
3067 Needs_Body : Boolean;
3068 Inline_Now : Boolean := False;
3070 Save_Style_Check : constant Boolean := Style_Check;
3071 -- Save style check mode for restore on exit
3073 procedure Delay_Descriptors (E : Entity_Id);
3074 -- Delay generation of subprogram descriptors for given entity
3076 function Might_Inline_Subp return Boolean;
3077 -- If inlining is active and the generic contains inlined subprograms,
3078 -- we instantiate the body. This may cause superfluous instantiations,
3079 -- but it is simpler than detecting the need for the body at the point
3080 -- of inlining, when the context of the instance is not available.
3082 -----------------------
3083 -- Delay_Descriptors --
3084 -----------------------
3086 procedure Delay_Descriptors (E : Entity_Id) is
3088 if not Delay_Subprogram_Descriptors (E) then
3089 Set_Delay_Subprogram_Descriptors (E);
3090 Pending_Descriptor.Append (E);
3092 end Delay_Descriptors;
3094 -----------------------
3095 -- Might_Inline_Subp --
3096 -----------------------
3098 function Might_Inline_Subp return Boolean is
3102 if not Inline_Processing_Required then
3106 E := First_Entity (Gen_Unit);
3107 while Present (E) loop
3108 if Is_Subprogram (E)
3109 and then Is_Inlined (E)
3119 end Might_Inline_Subp;
3121 -- Start of processing for Analyze_Package_Instantiation
3124 Check_SPARK_Restriction ("generic is not allowed", N);
3126 -- Very first thing: apply the special kludge for Text_IO processing
3127 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3129 Text_IO_Kludge (Name (N));
3131 -- Make node global for error reporting
3133 Instantiation_Node := N;
3135 -- Turn off style checking in instances. If the check is enabled on the
3136 -- generic unit, a warning in an instance would just be noise. If not
3137 -- enabled on the generic, then a warning in an instance is just wrong.
3139 Style_Check := False;
3141 -- Case of instantiation of a generic package
3143 if Nkind (N) = N_Package_Instantiation then
3144 Act_Decl_Id := New_Copy (Defining_Entity (N));
3145 Set_Comes_From_Source (Act_Decl_Id, True);
3147 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3149 Make_Defining_Program_Unit_Name (Loc,
3150 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
3151 Defining_Identifier => Act_Decl_Id);
3153 Act_Decl_Name := Act_Decl_Id;
3156 -- Case of instantiation of a formal package
3159 Act_Decl_Id := Defining_Identifier (N);
3160 Act_Decl_Name := Act_Decl_Id;
3163 Generate_Definition (Act_Decl_Id);
3164 Preanalyze_Actuals (N);
3167 Env_Installed := True;
3169 -- Reset renaming map for formal types. The mapping is established
3170 -- when analyzing the generic associations, but some mappings are
3171 -- inherited from formal packages of parent units, and these are
3172 -- constructed when the parents are installed.
3174 Generic_Renamings.Set_Last (0);
3175 Generic_Renamings_HTable.Reset;
3177 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3178 Gen_Unit := Entity (Gen_Id);
3180 -- Verify that it is the name of a generic package
3182 -- A visibility glitch: if the instance is a child unit and the generic
3183 -- is the generic unit of a parent instance (i.e. both the parent and
3184 -- the child units are instances of the same package) the name now
3185 -- denotes the renaming within the parent, not the intended generic
3186 -- unit. See if there is a homonym that is the desired generic. The
3187 -- renaming declaration must be visible inside the instance of the
3188 -- child, but not when analyzing the name in the instantiation itself.
3190 if Ekind (Gen_Unit) = E_Package
3191 and then Present (Renamed_Entity (Gen_Unit))
3192 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3193 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3194 and then Present (Homonym (Gen_Unit))
3196 Gen_Unit := Homonym (Gen_Unit);
3199 if Etype (Gen_Unit) = Any_Type then
3203 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3205 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3207 if From_With_Type (Gen_Unit) then
3209 ("cannot instantiate a limited withed package", Gen_Id);
3212 ("expect name of generic package in instantiation", Gen_Id);
3219 if In_Extended_Main_Source_Unit (N) then
3220 Set_Is_Instantiated (Gen_Unit);
3221 Generate_Reference (Gen_Unit, N);
3223 if Present (Renamed_Object (Gen_Unit)) then
3224 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3225 Generate_Reference (Renamed_Object (Gen_Unit), N);
3229 if Nkind (Gen_Id) = N_Identifier
3230 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3233 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3235 elsif Nkind (Gen_Id) = N_Expanded_Name
3236 and then Is_Child_Unit (Gen_Unit)
3237 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3238 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3241 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3244 Set_Entity (Gen_Id, Gen_Unit);
3246 -- If generic is a renaming, get original generic unit
3248 if Present (Renamed_Object (Gen_Unit))
3249 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3251 Gen_Unit := Renamed_Object (Gen_Unit);
3254 -- Verify that there are no circular instantiations
3256 if In_Open_Scopes (Gen_Unit) then
3257 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3261 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3262 Error_Msg_Node_2 := Current_Scope;
3264 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3265 Circularity_Detected := True;
3270 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3272 -- Initialize renamings map, for error checking, and the list that
3273 -- holds private entities whose views have changed between generic
3274 -- definition and instantiation. If this is the instance created to
3275 -- validate an actual package, the instantiation environment is that
3276 -- of the enclosing instance.
3278 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3280 -- Copy original generic tree, to produce text for instantiation
3284 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3286 Act_Spec := Specification (Act_Tree);
3288 -- If this is the instance created to validate an actual package,
3289 -- only the formals matter, do not examine the package spec itself.
3291 if Is_Actual_Pack then
3292 Set_Visible_Declarations (Act_Spec, New_List);
3293 Set_Private_Declarations (Act_Spec, New_List);
3297 Analyze_Associations
3299 Generic_Formal_Declarations (Act_Tree),
3300 Generic_Formal_Declarations (Gen_Decl));
3302 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3303 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3304 Set_Is_Generic_Instance (Act_Decl_Id);
3306 Set_Generic_Parent (Act_Spec, Gen_Unit);
3308 -- References to the generic in its own declaration or its body are
3309 -- references to the instance. Add a renaming declaration for the
3310 -- generic unit itself. This declaration, as well as the renaming
3311 -- declarations for the generic formals, must remain private to the
3312 -- unit: the formals, because this is the language semantics, and
3313 -- the unit because its use is an artifact of the implementation.
3316 Make_Package_Renaming_Declaration (Loc,
3317 Defining_Unit_Name =>
3318 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3319 Name => New_Reference_To (Act_Decl_Id, Loc));
3321 Append (Unit_Renaming, Renaming_List);
3323 -- The renaming declarations are the first local declarations of
3326 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3328 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3330 Set_Visible_Declarations (Act_Spec, Renaming_List);
3334 Make_Package_Declaration (Loc,
3335 Specification => Act_Spec);
3337 -- Save the instantiation node, for subsequent instantiation of the
3338 -- body, if there is one and we are generating code for the current
3339 -- unit. Mark the unit as having a body, to avoid a premature error
3342 -- We instantiate the body if we are generating code, if we are
3343 -- generating cross-reference information, or if we are building
3344 -- trees for ASIS use.
3347 Enclosing_Body_Present : Boolean := False;
3348 -- If the generic unit is not a compilation unit, then a body may
3349 -- be present in its parent even if none is required. We create a
3350 -- tentative pending instantiation for the body, which will be
3351 -- discarded if none is actually present.
3356 if Scope (Gen_Unit) /= Standard_Standard
3357 and then not Is_Child_Unit (Gen_Unit)
3359 Scop := Scope (Gen_Unit);
3361 while Present (Scop)
3362 and then Scop /= Standard_Standard
3364 if Unit_Requires_Body (Scop) then
3365 Enclosing_Body_Present := True;
3368 elsif In_Open_Scopes (Scop)
3369 and then In_Package_Body (Scop)
3371 Enclosing_Body_Present := True;
3375 exit when Is_Compilation_Unit (Scop);
3376 Scop := Scope (Scop);
3380 -- If front-end inlining is enabled, and this is a unit for which
3381 -- code will be generated, we instantiate the body at once.
3383 -- This is done if the instance is not the main unit, and if the
3384 -- generic is not a child unit of another generic, to avoid scope
3385 -- problems and the reinstallation of parent instances.
3388 and then (not Is_Child_Unit (Gen_Unit)
3389 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3390 and then Might_Inline_Subp
3391 and then not Is_Actual_Pack
3393 if Front_End_Inlining
3394 and then (Is_In_Main_Unit (N)
3395 or else In_Main_Context (Current_Scope))
3396 and then Nkind (Parent (N)) /= N_Compilation_Unit
3400 -- In configurable_run_time mode we force the inlining of
3401 -- predefined subprograms marked Inline_Always, to minimize
3402 -- the use of the run-time library.
3404 elsif Is_Predefined_File_Name
3405 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3406 and then Configurable_Run_Time_Mode
3407 and then Nkind (Parent (N)) /= N_Compilation_Unit
3412 -- If the current scope is itself an instance within a child
3413 -- unit, there will be duplications in the scope stack, and the
3414 -- unstacking mechanism in Inline_Instance_Body will fail.
3415 -- This loses some rare cases of optimization, and might be
3416 -- improved some day, if we can find a proper abstraction for
3417 -- "the complete compilation context" that can be saved and
3420 if Is_Generic_Instance (Current_Scope) then
3422 Curr_Unit : constant Entity_Id :=
3423 Cunit_Entity (Current_Sem_Unit);
3425 if Curr_Unit /= Current_Scope
3426 and then Is_Child_Unit (Curr_Unit)
3428 Inline_Now := False;
3435 (Unit_Requires_Body (Gen_Unit)
3436 or else Enclosing_Body_Present
3437 or else Present (Corresponding_Body (Gen_Decl)))
3438 and then (Is_In_Main_Unit (N)
3439 or else Might_Inline_Subp)
3440 and then not Is_Actual_Pack
3441 and then not Inline_Now
3442 and then not Alfa_Mode
3443 and then (Operating_Mode = Generate_Code
3444 or else (Operating_Mode = Check_Semantics
3445 and then ASIS_Mode));
3447 -- If front_end_inlining is enabled, do not instantiate body if
3448 -- within a generic context.
3450 if (Front_End_Inlining
3451 and then not Expander_Active)
3452 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3454 Needs_Body := False;
3457 -- If the current context is generic, and the package being
3458 -- instantiated is declared within a formal package, there is no
3459 -- body to instantiate until the enclosing generic is instantiated
3460 -- and there is an actual for the formal package. If the formal
3461 -- package has parameters, we build a regular package instance for
3462 -- it, that precedes the original formal package declaration.
3464 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3466 Decl : constant Node_Id :=
3468 (Unit_Declaration_Node (Scope (Gen_Unit)));
3470 if Nkind (Decl) = N_Formal_Package_Declaration
3471 or else (Nkind (Decl) = N_Package_Declaration
3472 and then Is_List_Member (Decl)
3473 and then Present (Next (Decl))
3475 Nkind (Next (Decl)) =
3476 N_Formal_Package_Declaration)
3478 Needs_Body := False;
3484 -- Note that we generate the instance body even when generating
3485 -- calling stubs for an RCI unit: it may be required e.g. if it
3486 -- provides stream attributes for some type used in the profile of a
3487 -- remote subprogram. If the instantiation is within the visible part
3488 -- of the RCI, then calling stubs for any relevant subprogram will
3489 -- be inserted immediately after the subprogram declaration, and
3490 -- will take precedence over the subsequent (original) body. (The
3491 -- stub and original body will be complete homographs, but this is
3492 -- permitted in an instance).
3494 -- Could we do better and remove the original subprogram body in that
3499 -- Here is a defence against a ludicrous number of instantiations
3500 -- caused by a circular set of instantiation attempts.
3502 if Pending_Instantiations.Last >
3503 Hostparm.Max_Instantiations
3505 Error_Msg_N ("too many instantiations", N);
3506 raise Unrecoverable_Error;
3509 -- Indicate that the enclosing scopes contain an instantiation,
3510 -- and that cleanup actions should be delayed until after the
3511 -- instance body is expanded.
3513 Check_Forward_Instantiation (Gen_Decl);
3514 if Nkind (N) = N_Package_Instantiation then
3516 Enclosing_Master : Entity_Id;
3519 -- Loop to search enclosing masters
3521 Enclosing_Master := Current_Scope;
3522 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3523 if Ekind (Enclosing_Master) = E_Package then
3524 if Is_Compilation_Unit (Enclosing_Master) then
3525 if In_Package_Body (Enclosing_Master) then
3527 (Body_Entity (Enclosing_Master));
3536 Enclosing_Master := Scope (Enclosing_Master);
3539 elsif Is_Generic_Unit (Enclosing_Master)
3540 or else Ekind (Enclosing_Master) = E_Void
3542 -- Cleanup actions will eventually be performed on the
3543 -- enclosing subprogram or package instance, if any.
3544 -- Enclosing scope is void in the formal part of a
3545 -- generic subprogram.
3550 if Ekind (Enclosing_Master) = E_Entry
3552 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3554 if not Expander_Active then
3558 Protected_Body_Subprogram (Enclosing_Master);
3562 Set_Delay_Cleanups (Enclosing_Master);
3564 while Ekind (Enclosing_Master) = E_Block loop
3565 Enclosing_Master := Scope (Enclosing_Master);
3568 if Is_Subprogram (Enclosing_Master) then
3569 Delay_Descriptors (Enclosing_Master);
3571 elsif Is_Task_Type (Enclosing_Master) then
3573 TBP : constant Node_Id :=
3574 Get_Task_Body_Procedure
3577 if Present (TBP) then
3578 Delay_Descriptors (TBP);
3579 Set_Delay_Cleanups (TBP);
3586 end loop Scope_Loop;
3589 -- Make entry in table
3591 Pending_Instantiations.Append
3593 Act_Decl => Act_Decl,
3594 Expander_Status => Expander_Active,
3595 Current_Sem_Unit => Current_Sem_Unit,
3596 Scope_Suppress => Scope_Suppress,
3597 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3598 Version => Ada_Version));
3602 Set_Categorization_From_Pragmas (Act_Decl);
3604 if Parent_Installed then
3608 Set_Instance_Spec (N, Act_Decl);
3610 -- If not a compilation unit, insert the package declaration before
3611 -- the original instantiation node.
3613 if Nkind (Parent (N)) /= N_Compilation_Unit then
3614 Mark_Rewrite_Insertion (Act_Decl);
3615 Insert_Before (N, Act_Decl);
3618 -- For an instantiation that is a compilation unit, place declaration
3619 -- on current node so context is complete for analysis (including
3620 -- nested instantiations). If this is the main unit, the declaration
3621 -- eventually replaces the instantiation node. If the instance body
3622 -- is created later, it replaces the instance node, and the
3623 -- declaration is attached to it (see
3624 -- Build_Instance_Compilation_Unit_Nodes).
3627 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3629 -- The entity for the current unit is the newly created one,
3630 -- and all semantic information is attached to it.
3632 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3634 -- If this is the main unit, replace the main entity as well
3636 if Current_Sem_Unit = Main_Unit then
3637 Main_Unit_Entity := Act_Decl_Id;
3641 Set_Unit (Parent (N), Act_Decl);
3642 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3643 Set_Package_Instantiation (Act_Decl_Id, N);
3645 Set_Unit (Parent (N), N);
3646 Set_Body_Required (Parent (N), False);
3648 -- We never need elaboration checks on instantiations, since by
3649 -- definition, the body instantiation is elaborated at the same
3650 -- time as the spec instantiation.
3652 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3653 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3656 Check_Elab_Instantiation (N);
3658 if ABE_Is_Certain (N) and then Needs_Body then
3659 Pending_Instantiations.Decrement_Last;
3662 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3664 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3665 First_Private_Entity (Act_Decl_Id));
3667 -- If the instantiation will receive a body, the unit will be
3668 -- transformed into a package body, and receive its own elaboration
3669 -- entity. Otherwise, the nature of the unit is now a package
3672 if Nkind (Parent (N)) = N_Compilation_Unit
3673 and then not Needs_Body
3675 Rewrite (N, Act_Decl);
3678 if Present (Corresponding_Body (Gen_Decl))
3679 or else Unit_Requires_Body (Gen_Unit)
3681 Set_Has_Completion (Act_Decl_Id);
3684 Check_Formal_Packages (Act_Decl_Id);
3686 Restore_Private_Views (Act_Decl_Id);
3688 Inherit_Context (Gen_Decl, N);
3690 if Parent_Installed then
3695 Env_Installed := False;
3698 Validate_Categorization_Dependency (N, Act_Decl_Id);
3700 -- There used to be a check here to prevent instantiations in local
3701 -- contexts if the No_Local_Allocators restriction was active. This
3702 -- check was removed by a binding interpretation in AI-95-00130/07,
3703 -- but we retain the code for documentation purposes.
3705 -- if Ekind (Act_Decl_Id) /= E_Void
3706 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3708 -- Check_Restriction (No_Local_Allocators, N);
3712 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3715 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3716 -- be used as defining identifiers for a formal package and for the
3717 -- corresponding expanded package.
3719 if Nkind (N) = N_Formal_Package_Declaration then
3720 Act_Decl_Id := New_Copy (Defining_Entity (N));
3721 Set_Comes_From_Source (Act_Decl_Id, True);
3722 Set_Is_Generic_Instance (Act_Decl_Id, False);
3723 Set_Defining_Identifier (N, Act_Decl_Id);
3726 Style_Check := Save_Style_Check;
3729 if Has_Aspects (N) then
3730 Analyze_Aspect_Specifications (N, Act_Decl_Id);
3734 when Instantiation_Error =>
3735 if Parent_Installed then
3739 if Env_Installed then
3743 Style_Check := Save_Style_Check;
3744 end Analyze_Package_Instantiation;
3746 --------------------------
3747 -- Inline_Instance_Body --
3748 --------------------------
3750 procedure Inline_Instance_Body
3752 Gen_Unit : Entity_Id;
3756 Gen_Comp : constant Entity_Id :=
3757 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3758 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3759 Curr_Scope : Entity_Id := Empty;
3760 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
3761 Removed : Boolean := False;
3762 Num_Scopes : Int := 0;
3764 Scope_Stack_Depth : constant Int :=
3765 Scope_Stack.Last - Scope_Stack.First + 1;
3767 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3768 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3769 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3770 Num_Inner : Int := 0;
3771 N_Instances : Int := 0;
3775 -- Case of generic unit defined in another unit. We must remove the
3776 -- complete context of the current unit to install that of the generic.
3778 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3780 -- Add some comments for the following two loops ???
3783 while Present (S) and then S /= Standard_Standard loop
3785 Num_Scopes := Num_Scopes + 1;
3787 Use_Clauses (Num_Scopes) :=
3789 (Scope_Stack.Last - Num_Scopes + 1).
3791 End_Use_Clauses (Use_Clauses (Num_Scopes));
3793 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3794 or else Scope_Stack.Table
3795 (Scope_Stack.Last - Num_Scopes).Entity
3799 exit when Is_Generic_Instance (S)
3800 and then (In_Package_Body (S)
3801 or else Ekind (S) = E_Procedure
3802 or else Ekind (S) = E_Function);
3806 Vis := Is_Immediately_Visible (Gen_Comp);
3808 -- Find and save all enclosing instances
3813 and then S /= Standard_Standard
3815 if Is_Generic_Instance (S) then
3816 N_Instances := N_Instances + 1;
3817 Instances (N_Instances) := S;
3819 exit when In_Package_Body (S);
3825 -- Remove context of current compilation unit, unless we are within a
3826 -- nested package instantiation, in which case the context has been
3827 -- removed previously.
3829 -- If current scope is the body of a child unit, remove context of
3830 -- spec as well. If an enclosing scope is an instance body, the
3831 -- context has already been removed, but the entities in the body
3832 -- must be made invisible as well.
3837 and then S /= Standard_Standard
3839 if Is_Generic_Instance (S)
3840 and then (In_Package_Body (S)
3841 or else Ekind (S) = E_Procedure
3842 or else Ekind (S) = E_Function)
3844 -- We still have to remove the entities of the enclosing
3845 -- instance from direct visibility.
3850 E := First_Entity (S);
3851 while Present (E) loop
3852 Set_Is_Immediately_Visible (E, False);
3861 or else (Ekind (Curr_Unit) = E_Package_Body
3862 and then S = Spec_Entity (Curr_Unit))
3863 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3866 (Unit_Declaration_Node (Curr_Unit)))
3870 -- Remove entities in current scopes from visibility, so that
3871 -- instance body is compiled in a clean environment.
3873 Save_Scope_Stack (Handle_Use => False);
3875 if Is_Child_Unit (S) then
3877 -- Remove child unit from stack, as well as inner scopes.
3878 -- Removing the context of a child unit removes parent units
3881 while Current_Scope /= S loop
3882 Num_Inner := Num_Inner + 1;
3883 Inner_Scopes (Num_Inner) := Current_Scope;
3888 Remove_Context (Curr_Comp);
3892 Remove_Context (Curr_Comp);
3895 if Ekind (Curr_Unit) = E_Package_Body then
3896 Remove_Context (Library_Unit (Curr_Comp));
3902 pragma Assert (Num_Inner < Num_Scopes);
3904 Push_Scope (Standard_Standard);
3905 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3906 Instantiate_Package_Body
3909 Act_Decl => Act_Decl,
3910 Expander_Status => Expander_Active,
3911 Current_Sem_Unit => Current_Sem_Unit,
3912 Scope_Suppress => Scope_Suppress,
3913 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3914 Version => Ada_Version)),
3915 Inlined_Body => True);
3921 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3923 -- Reset Generic_Instance flag so that use clauses can be installed
3924 -- in the proper order. (See Use_One_Package for effect of enclosing
3925 -- instances on processing of use clauses).
3927 for J in 1 .. N_Instances loop
3928 Set_Is_Generic_Instance (Instances (J), False);
3932 Install_Context (Curr_Comp);
3934 if Present (Curr_Scope)
3935 and then Is_Child_Unit (Curr_Scope)
3937 Push_Scope (Curr_Scope);
3938 Set_Is_Immediately_Visible (Curr_Scope);
3940 -- Finally, restore inner scopes as well
3942 for J in reverse 1 .. Num_Inner loop
3943 Push_Scope (Inner_Scopes (J));
3947 Restore_Scope_Stack (Handle_Use => False);
3949 if Present (Curr_Scope)
3951 (In_Private_Part (Curr_Scope)
3952 or else In_Package_Body (Curr_Scope))
3954 -- Install private declaration of ancestor units, which are
3955 -- currently available. Restore_Scope_Stack and Install_Context
3956 -- only install the visible part of parents.
3961 Par := Scope (Curr_Scope);
3962 while (Present (Par))
3963 and then Par /= Standard_Standard
3965 Install_Private_Declarations (Par);
3972 -- Restore use clauses. For a child unit, use clauses in the parents
3973 -- are restored when installing the context, so only those in inner
3974 -- scopes (and those local to the child unit itself) need to be
3975 -- installed explicitly.
3977 if Is_Child_Unit (Curr_Unit)
3980 for J in reverse 1 .. Num_Inner + 1 loop
3981 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3983 Install_Use_Clauses (Use_Clauses (J));
3987 for J in reverse 1 .. Num_Scopes loop
3988 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3990 Install_Use_Clauses (Use_Clauses (J));
3994 -- Restore status of instances. If one of them is a body, make
3995 -- its local entities visible again.
4002 for J in 1 .. N_Instances loop
4003 Inst := Instances (J);
4004 Set_Is_Generic_Instance (Inst, True);
4006 if In_Package_Body (Inst)
4007 or else Ekind (S) = E_Procedure
4008 or else Ekind (S) = E_Function
4010 E := First_Entity (Instances (J));
4011 while Present (E) loop
4012 Set_Is_Immediately_Visible (E);
4019 -- If generic unit is in current unit, current context is correct
4022 Instantiate_Package_Body
4025 Act_Decl => Act_Decl,
4026 Expander_Status => Expander_Active,
4027 Current_Sem_Unit => Current_Sem_Unit,
4028 Scope_Suppress => Scope_Suppress,
4029 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4030 Version => Ada_Version)),
4031 Inlined_Body => True);
4033 end Inline_Instance_Body;
4035 -------------------------------------
4036 -- Analyze_Procedure_Instantiation --
4037 -------------------------------------
4039 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4041 Analyze_Subprogram_Instantiation (N, E_Procedure);
4042 end Analyze_Procedure_Instantiation;
4044 -----------------------------------
4045 -- Need_Subprogram_Instance_Body --
4046 -----------------------------------
4048 function Need_Subprogram_Instance_Body
4050 Subp : Entity_Id) return Boolean
4053 if (Is_In_Main_Unit (N)
4054 or else Is_Inlined (Subp)
4055 or else Is_Inlined (Alias (Subp)))
4056 and then (Operating_Mode = Generate_Code
4057 or else (Operating_Mode = Check_Semantics
4058 and then ASIS_Mode))
4059 and then (Full_Expander_Active or else ASIS_Mode)
4060 and then not ABE_Is_Certain (N)
4061 and then not Is_Eliminated (Subp)
4063 Pending_Instantiations.Append
4065 Act_Decl => Unit_Declaration_Node (Subp),
4066 Expander_Status => Expander_Active,
4067 Current_Sem_Unit => Current_Sem_Unit,
4068 Scope_Suppress => Scope_Suppress,
4069 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4070 Version => Ada_Version));
4076 end Need_Subprogram_Instance_Body;
4078 --------------------------------------
4079 -- Analyze_Subprogram_Instantiation --
4080 --------------------------------------
4082 procedure Analyze_Subprogram_Instantiation
4086 Loc : constant Source_Ptr := Sloc (N);
4087 Gen_Id : constant Node_Id := Name (N);
4089 Anon_Id : constant Entity_Id :=
4090 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4091 Chars => New_External_Name
4092 (Chars (Defining_Entity (N)), 'R'));
4094 Act_Decl_Id : Entity_Id;
4099 Env_Installed : Boolean := False;
4100 Gen_Unit : Entity_Id;
4102 Pack_Id : Entity_Id;
4103 Parent_Installed : Boolean := False;
4104 Renaming_List : List_Id;
4106 Save_Style_Check : constant Boolean := Style_Check;
4107 -- Save style check mode for restore on exit
4109 procedure Analyze_Instance_And_Renamings;
4110 -- The instance must be analyzed in a context that includes the mappings
4111 -- of generic parameters into actuals. We create a package declaration
4112 -- for this purpose, and a subprogram with an internal name within the
4113 -- package. The subprogram instance is simply an alias for the internal
4114 -- subprogram, declared in the current scope.
4116 ------------------------------------
4117 -- Analyze_Instance_And_Renamings --
4118 ------------------------------------
4120 procedure Analyze_Instance_And_Renamings is
4121 Def_Ent : constant Entity_Id := Defining_Entity (N);
4122 Pack_Decl : Node_Id;
4125 if Nkind (Parent (N)) = N_Compilation_Unit then
4127 -- For the case of a compilation unit, the container package has
4128 -- the same name as the instantiation, to insure that the binder
4129 -- calls the elaboration procedure with the right name. Copy the
4130 -- entity of the instance, which may have compilation level flags
4131 -- (e.g. Is_Child_Unit) set.
4133 Pack_Id := New_Copy (Def_Ent);
4136 -- Otherwise we use the name of the instantiation concatenated
4137 -- with its source position to ensure uniqueness if there are
4138 -- several instantiations with the same name.
4141 Make_Defining_Identifier (Loc,
4142 Chars => New_External_Name
4143 (Related_Id => Chars (Def_Ent),
4145 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4148 Pack_Decl := Make_Package_Declaration (Loc,
4149 Specification => Make_Package_Specification (Loc,
4150 Defining_Unit_Name => Pack_Id,
4151 Visible_Declarations => Renaming_List,
4152 End_Label => Empty));
4154 Set_Instance_Spec (N, Pack_Decl);
4155 Set_Is_Generic_Instance (Pack_Id);
4156 Set_Debug_Info_Needed (Pack_Id);
4158 -- Case of not a compilation unit
4160 if Nkind (Parent (N)) /= N_Compilation_Unit then
4161 Mark_Rewrite_Insertion (Pack_Decl);
4162 Insert_Before (N, Pack_Decl);
4163 Set_Has_Completion (Pack_Id);
4165 -- Case of an instantiation that is a compilation unit
4167 -- Place declaration on current node so context is complete for
4168 -- analysis (including nested instantiations), and for use in a
4169 -- context_clause (see Analyze_With_Clause).
4172 Set_Unit (Parent (N), Pack_Decl);
4173 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4176 Analyze (Pack_Decl);
4177 Check_Formal_Packages (Pack_Id);
4178 Set_Is_Generic_Instance (Pack_Id, False);
4180 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4183 -- Body of the enclosing package is supplied when instantiating the
4184 -- subprogram body, after semantic analysis is completed.
4186 if Nkind (Parent (N)) = N_Compilation_Unit then
4188 -- Remove package itself from visibility, so it does not
4189 -- conflict with subprogram.
4191 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4193 -- Set name and scope of internal subprogram so that the proper
4194 -- external name will be generated. The proper scope is the scope
4195 -- of the wrapper package. We need to generate debugging info for
4196 -- the internal subprogram, so set flag accordingly.
4198 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4199 Set_Scope (Anon_Id, Scope (Pack_Id));
4201 -- Mark wrapper package as referenced, to avoid spurious warnings
4202 -- if the instantiation appears in various with_ clauses of
4203 -- subunits of the main unit.
4205 Set_Referenced (Pack_Id);
4208 Set_Is_Generic_Instance (Anon_Id);
4209 Set_Debug_Info_Needed (Anon_Id);
4210 Act_Decl_Id := New_Copy (Anon_Id);
4212 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4213 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4214 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4215 Set_Comes_From_Source (Act_Decl_Id, True);
4217 -- The signature may involve types that are not frozen yet, but the
4218 -- subprogram will be frozen at the point the wrapper package is
4219 -- frozen, so it does not need its own freeze node. In fact, if one
4220 -- is created, it might conflict with the freezing actions from the
4223 Set_Has_Delayed_Freeze (Anon_Id, False);
4225 -- If the instance is a child unit, mark the Id accordingly. Mark
4226 -- the anonymous entity as well, which is the real subprogram and
4227 -- which is used when the instance appears in a context clause.
4228 -- Similarly, propagate the Is_Eliminated flag to handle properly
4229 -- nested eliminated subprograms.
4231 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4232 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4233 New_Overloaded_Entity (Act_Decl_Id);
4234 Check_Eliminated (Act_Decl_Id);
4235 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4237 -- In compilation unit case, kill elaboration checks on the
4238 -- instantiation, since they are never needed -- the body is
4239 -- instantiated at the same point as the spec.
4241 if Nkind (Parent (N)) = N_Compilation_Unit then
4242 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4243 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4244 Set_Is_Compilation_Unit (Anon_Id);
4246 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4249 -- The instance is not a freezing point for the new subprogram
4251 Set_Is_Frozen (Act_Decl_Id, False);
4253 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4254 Valid_Operator_Definition (Act_Decl_Id);
4257 Set_Alias (Act_Decl_Id, Anon_Id);
4258 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4259 Set_Has_Completion (Act_Decl_Id);
4260 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4262 if Nkind (Parent (N)) = N_Compilation_Unit then
4263 Set_Body_Required (Parent (N), False);
4265 end Analyze_Instance_And_Renamings;
4267 -- Start of processing for Analyze_Subprogram_Instantiation
4270 Check_SPARK_Restriction ("generic is not allowed", N);
4272 -- Very first thing: apply the special kludge for Text_IO processing
4273 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4274 -- Of course such an instantiation is bogus (these are packages, not
4275 -- subprograms), but we get a better error message if we do this.
4277 Text_IO_Kludge (Gen_Id);
4279 -- Make node global for error reporting
4281 Instantiation_Node := N;
4283 -- Turn off style checking in instances. If the check is enabled on the
4284 -- generic unit, a warning in an instance would just be noise. If not
4285 -- enabled on the generic, then a warning in an instance is just wrong.
4287 Style_Check := False;
4289 Preanalyze_Actuals (N);
4292 Env_Installed := True;
4293 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4294 Gen_Unit := Entity (Gen_Id);
4296 Generate_Reference (Gen_Unit, Gen_Id);
4298 if Nkind (Gen_Id) = N_Identifier
4299 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4302 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4305 if Etype (Gen_Unit) = Any_Type then
4310 -- Verify that it is a generic subprogram of the right kind, and that
4311 -- it does not lead to a circular instantiation.
4313 if not Ekind_In (Gen_Unit, E_Generic_Procedure, E_Generic_Function) then
4314 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
4316 elsif In_Open_Scopes (Gen_Unit) then
4317 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4319 elsif K = E_Procedure
4320 and then Ekind (Gen_Unit) /= E_Generic_Procedure
4322 if Ekind (Gen_Unit) = E_Generic_Function then
4324 ("cannot instantiate generic function as procedure", Gen_Id);
4327 ("expect name of generic procedure in instantiation", Gen_Id);
4330 elsif K = E_Function
4331 and then Ekind (Gen_Unit) /= E_Generic_Function
4333 if Ekind (Gen_Unit) = E_Generic_Procedure then
4335 ("cannot instantiate generic procedure as function", Gen_Id);
4338 ("expect name of generic function in instantiation", Gen_Id);
4342 Set_Entity (Gen_Id, Gen_Unit);
4343 Set_Is_Instantiated (Gen_Unit);
4345 if In_Extended_Main_Source_Unit (N) then
4346 Generate_Reference (Gen_Unit, N);
4349 -- If renaming, get original unit
4351 if Present (Renamed_Object (Gen_Unit))
4352 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4354 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4356 Gen_Unit := Renamed_Object (Gen_Unit);
4357 Set_Is_Instantiated (Gen_Unit);
4358 Generate_Reference (Gen_Unit, N);
4361 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4362 Error_Msg_Node_2 := Current_Scope;
4364 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4365 Circularity_Detected := True;
4369 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4371 -- Initialize renamings map, for error checking
4373 Generic_Renamings.Set_Last (0);
4374 Generic_Renamings_HTable.Reset;
4376 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4378 -- Copy original generic tree, to produce text for instantiation
4382 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4384 -- Inherit overriding indicator from instance node
4386 Act_Spec := Specification (Act_Tree);
4387 Set_Must_Override (Act_Spec, Must_Override (N));
4388 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4391 Analyze_Associations
4393 Generic_Formal_Declarations (Act_Tree),
4394 Generic_Formal_Declarations (Gen_Decl));
4396 -- The subprogram itself cannot contain a nested instance, so the
4397 -- current parent is left empty.
4399 Set_Instance_Env (Gen_Unit, Empty);
4401 -- Build the subprogram declaration, which does not appear in the
4402 -- generic template, and give it a sloc consistent with that of the
4405 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4406 Set_Generic_Parent (Act_Spec, Gen_Unit);
4408 Make_Subprogram_Declaration (Sloc (Act_Spec),
4409 Specification => Act_Spec);
4411 -- The aspects have been copied previously, but they have to be
4412 -- linked explicitly to the new subprogram declaration. Explicit
4413 -- pre/postconditions on the instance are analyzed below, in a
4416 Move_Aspects (Act_Tree, Act_Decl);
4417 Set_Categorization_From_Pragmas (Act_Decl);
4419 if Parent_Installed then
4423 Append (Act_Decl, Renaming_List);
4424 Analyze_Instance_And_Renamings;
4426 -- If the generic is marked Import (Intrinsic), then so is the
4427 -- instance. This indicates that there is no body to instantiate. If
4428 -- generic is marked inline, so it the instance, and the anonymous
4429 -- subprogram it renames. If inlined, or else if inlining is enabled
4430 -- for the compilation, we generate the instance body even if it is
4431 -- not within the main unit.
4433 if Is_Intrinsic_Subprogram (Gen_Unit) then
4434 Set_Is_Intrinsic_Subprogram (Anon_Id);
4435 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4437 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4438 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4442 -- Inherit convention from generic unit. Intrinsic convention, as for
4443 -- an instance of unchecked conversion, is not inherited because an
4444 -- explicit Ada instance has been created.
4446 if Has_Convention_Pragma (Gen_Unit)
4447 and then Convention (Gen_Unit) /= Convention_Intrinsic
4449 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
4450 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
4453 Generate_Definition (Act_Decl_Id);
4454 Set_Contract (Anon_Id, Make_Contract (Sloc (Anon_Id))); -- ??? needed?
4455 Set_Contract (Act_Decl_Id, Make_Contract (Sloc (Act_Decl_Id)));
4457 -- Inherit all inlining-related flags which apply to the generic in
4458 -- the subprogram and its declaration.
4460 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4461 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4463 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
4464 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
4466 Set_Has_Pragma_Inline_Always
4467 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
4468 Set_Has_Pragma_Inline_Always
4469 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
4471 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4472 Check_Elab_Instantiation (N);
4475 if Is_Dispatching_Operation (Act_Decl_Id)
4476 and then Ada_Version >= Ada_2005
4482 Formal := First_Formal (Act_Decl_Id);
4483 while Present (Formal) loop
4484 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4485 and then Is_Controlling_Formal (Formal)
4486 and then not Can_Never_Be_Null (Formal)
4488 Error_Msg_NE ("access parameter& is controlling,",
4491 ("\corresponding parameter of & must be"
4492 & " explicitly null-excluding", N, Gen_Id);
4495 Next_Formal (Formal);
4500 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4502 Validate_Categorization_Dependency (N, Act_Decl_Id);
4504 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4505 Inherit_Context (Gen_Decl, N);
4507 Restore_Private_Views (Pack_Id, False);
4509 -- If the context requires a full instantiation, mark node for
4510 -- subsequent construction of the body.
4512 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4514 Check_Forward_Instantiation (Gen_Decl);
4516 -- The wrapper package is always delayed, because it does not
4517 -- constitute a freeze point, but to insure that the freeze
4518 -- node is placed properly, it is created directly when
4519 -- instantiating the body (otherwise the freeze node might
4520 -- appear to early for nested instantiations).
4522 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4524 -- For ASIS purposes, indicate that the wrapper package has
4525 -- replaced the instantiation node.
4527 Rewrite (N, Unit (Parent (N)));
4528 Set_Unit (Parent (N), N);
4531 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4533 -- Replace instance node for library-level instantiations of
4534 -- intrinsic subprograms, for ASIS use.
4536 Rewrite (N, Unit (Parent (N)));
4537 Set_Unit (Parent (N), N);
4540 if Parent_Installed then
4545 Env_Installed := False;
4546 Generic_Renamings.Set_Last (0);
4547 Generic_Renamings_HTable.Reset;
4550 Style_Check := Save_Style_Check;
4553 if Has_Aspects (N) then
4554 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4558 when Instantiation_Error =>
4559 if Parent_Installed then
4563 if Env_Installed then
4567 Style_Check := Save_Style_Check;
4568 end Analyze_Subprogram_Instantiation;
4570 -------------------------
4571 -- Get_Associated_Node --
4572 -------------------------
4574 function Get_Associated_Node (N : Node_Id) return Node_Id is
4578 Assoc := Associated_Node (N);
4580 if Nkind (Assoc) /= Nkind (N) then
4583 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4587 -- If the node is part of an inner generic, it may itself have been
4588 -- remapped into a further generic copy. Associated_Node is otherwise
4589 -- used for the entity of the node, and will be of a different node
4590 -- kind, or else N has been rewritten as a literal or function call.
4592 while Present (Associated_Node (Assoc))
4593 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4595 Assoc := Associated_Node (Assoc);
4598 -- Follow and additional link in case the final node was rewritten.
4599 -- This can only happen with nested generic units.
4601 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4602 and then Present (Associated_Node (Assoc))
4603 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4604 N_Explicit_Dereference,
4609 Assoc := Associated_Node (Assoc);
4614 end Get_Associated_Node;
4616 -------------------------------------------
4617 -- Build_Instance_Compilation_Unit_Nodes --
4618 -------------------------------------------
4620 procedure Build_Instance_Compilation_Unit_Nodes
4625 Decl_Cunit : Node_Id;
4626 Body_Cunit : Node_Id;
4628 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4629 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4632 -- A new compilation unit node is built for the instance declaration
4635 Make_Compilation_Unit (Sloc (N),
4636 Context_Items => Empty_List,
4639 Make_Compilation_Unit_Aux (Sloc (N)));
4641 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4643 -- The new compilation unit is linked to its body, but both share the
4644 -- same file, so we do not set Body_Required on the new unit so as not
4645 -- to create a spurious dependency on a non-existent body in the ali.
4646 -- This simplifies CodePeer unit traversal.
4648 -- We use the original instantiation compilation unit as the resulting
4649 -- compilation unit of the instance, since this is the main unit.
4651 Rewrite (N, Act_Body);
4652 Body_Cunit := Parent (N);
4654 -- The two compilation unit nodes are linked by the Library_Unit field
4656 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4657 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4659 -- Preserve the private nature of the package if needed
4661 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4663 -- If the instance is not the main unit, its context, categorization
4664 -- and elaboration entity are not relevant to the compilation.
4666 if Body_Cunit /= Cunit (Main_Unit) then
4667 Make_Instance_Unit (Body_Cunit, In_Main => False);
4671 -- The context clause items on the instantiation, which are now attached
4672 -- to the body compilation unit (since the body overwrote the original
4673 -- instantiation node), semantically belong on the spec, so copy them
4674 -- there. It's harmless to leave them on the body as well. In fact one
4675 -- could argue that they belong in both places.
4677 Citem := First (Context_Items (Body_Cunit));
4678 while Present (Citem) loop
4679 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4683 -- Propagate categorization flags on packages, so that they appear in
4684 -- the ali file for the spec of the unit.
4686 if Ekind (New_Main) = E_Package then
4687 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4688 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4689 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4690 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4691 Set_Is_Remote_Call_Interface
4692 (Old_Main, Is_Remote_Call_Interface (New_Main));
4695 -- Make entry in Units table, so that binder can generate call to
4696 -- elaboration procedure for body, if any.
4698 Make_Instance_Unit (Body_Cunit, In_Main => True);
4699 Main_Unit_Entity := New_Main;
4700 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4702 -- Build elaboration entity, since the instance may certainly generate
4703 -- elaboration code requiring a flag for protection.
4705 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4706 end Build_Instance_Compilation_Unit_Nodes;
4708 -----------------------------
4709 -- Check_Access_Definition --
4710 -----------------------------
4712 procedure Check_Access_Definition (N : Node_Id) is
4715 (Ada_Version >= Ada_2005
4716 and then Present (Access_Definition (N)));
4718 end Check_Access_Definition;
4720 -----------------------------------
4721 -- Check_Formal_Package_Instance --
4722 -----------------------------------
4724 -- If the formal has specific parameters, they must match those of the
4725 -- actual. Both of them are instances, and the renaming declarations for
4726 -- their formal parameters appear in the same order in both. The analyzed
4727 -- formal has been analyzed in the context of the current instance.
4729 procedure Check_Formal_Package_Instance
4730 (Formal_Pack : Entity_Id;
4731 Actual_Pack : Entity_Id)
4733 E1 : Entity_Id := First_Entity (Actual_Pack);
4734 E2 : Entity_Id := First_Entity (Formal_Pack);
4739 procedure Check_Mismatch (B : Boolean);
4740 -- Common error routine for mismatch between the parameters of the
4741 -- actual instance and those of the formal package.
4743 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4744 -- The formal may come from a nested formal package, and the actual may
4745 -- have been constant-folded. To determine whether the two denote the
4746 -- same entity we may have to traverse several definitions to recover
4747 -- the ultimate entity that they refer to.
4749 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4750 -- Similarly, if the formal comes from a nested formal package, the
4751 -- actual may designate the formal through multiple renamings, which
4752 -- have to be followed to determine the original variable in question.
4754 --------------------
4755 -- Check_Mismatch --
4756 --------------------
4758 procedure Check_Mismatch (B : Boolean) is
4759 Kind : constant Node_Kind := Nkind (Parent (E2));
4762 if Kind = N_Formal_Type_Declaration then
4765 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
4766 N_Formal_Package_Declaration)
4767 or else Kind in N_Formal_Subprogram_Declaration
4773 ("actual for & in actual instance does not match formal",
4774 Parent (Actual_Pack), E1);
4778 --------------------------------
4779 -- Same_Instantiated_Constant --
4780 --------------------------------
4782 function Same_Instantiated_Constant
4783 (E1, E2 : Entity_Id) return Boolean
4789 while Present (Ent) loop
4793 elsif Ekind (Ent) /= E_Constant then
4796 elsif Is_Entity_Name (Constant_Value (Ent)) then
4797 if Entity (Constant_Value (Ent)) = E1 then
4800 Ent := Entity (Constant_Value (Ent));
4803 -- The actual may be a constant that has been folded. Recover
4806 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4807 Ent := Entity (Original_Node (Constant_Value (Ent)));
4814 end Same_Instantiated_Constant;
4816 --------------------------------
4817 -- Same_Instantiated_Variable --
4818 --------------------------------
4820 function Same_Instantiated_Variable
4821 (E1, E2 : Entity_Id) return Boolean
4823 function Original_Entity (E : Entity_Id) return Entity_Id;
4824 -- Follow chain of renamings to the ultimate ancestor
4826 ---------------------
4827 -- Original_Entity --
4828 ---------------------
4830 function Original_Entity (E : Entity_Id) return Entity_Id is
4835 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4836 and then Present (Renamed_Object (Orig))
4837 and then Is_Entity_Name (Renamed_Object (Orig))
4839 Orig := Entity (Renamed_Object (Orig));
4843 end Original_Entity;
4845 -- Start of processing for Same_Instantiated_Variable
4848 return Ekind (E1) = Ekind (E2)
4849 and then Original_Entity (E1) = Original_Entity (E2);
4850 end Same_Instantiated_Variable;
4852 -- Start of processing for Check_Formal_Package_Instance
4856 and then Present (E2)
4858 exit when Ekind (E1) = E_Package
4859 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4861 -- If the formal is the renaming of the formal package, this
4862 -- is the end of its formal part, which may occur before the
4863 -- end of the formal part in the actual in the presence of
4864 -- defaulted parameters in the formal package.
4866 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4867 and then Renamed_Entity (E2) = Scope (E2);
4869 -- The analysis of the actual may generate additional internal
4870 -- entities. If the formal is defaulted, there is no corresponding
4871 -- analysis and the internal entities must be skipped, until we
4872 -- find corresponding entities again.
4874 if Comes_From_Source (E2)
4875 and then not Comes_From_Source (E1)
4876 and then Chars (E1) /= Chars (E2)
4879 and then Chars (E1) /= Chars (E2)
4888 -- If the formal entity comes from a formal declaration, it was
4889 -- defaulted in the formal package, and no check is needed on it.
4891 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4894 elsif Is_Type (E1) then
4896 -- Subtypes must statically match. E1, E2 are the local entities
4897 -- that are subtypes of the actuals. Itypes generated for other
4898 -- parameters need not be checked, the check will be performed
4899 -- on the parameters themselves.
4901 -- If E2 is a formal type declaration, it is a defaulted parameter
4902 -- and needs no checking.
4904 if not Is_Itype (E1)
4905 and then not Is_Itype (E2)
4909 or else Etype (E1) /= Etype (E2)
4910 or else not Subtypes_Statically_Match (E1, E2));
4913 elsif Ekind (E1) = E_Constant then
4915 -- IN parameters must denote the same static value, or the same
4916 -- constant, or the literal null.
4918 Expr1 := Expression (Parent (E1));
4920 if Ekind (E2) /= E_Constant then
4921 Check_Mismatch (True);
4924 Expr2 := Expression (Parent (E2));
4927 if Is_Static_Expression (Expr1) then
4929 if not Is_Static_Expression (Expr2) then
4930 Check_Mismatch (True);
4932 elsif Is_Discrete_Type (Etype (E1)) then
4934 V1 : constant Uint := Expr_Value (Expr1);
4935 V2 : constant Uint := Expr_Value (Expr2);
4937 Check_Mismatch (V1 /= V2);
4940 elsif Is_Real_Type (Etype (E1)) then
4942 V1 : constant Ureal := Expr_Value_R (Expr1);
4943 V2 : constant Ureal := Expr_Value_R (Expr2);
4945 Check_Mismatch (V1 /= V2);
4948 elsif Is_String_Type (Etype (E1))
4949 and then Nkind (Expr1) = N_String_Literal
4951 if Nkind (Expr2) /= N_String_Literal then
4952 Check_Mismatch (True);
4955 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4959 elsif Is_Entity_Name (Expr1) then
4960 if Is_Entity_Name (Expr2) then
4961 if Entity (Expr1) = Entity (Expr2) then
4965 (not Same_Instantiated_Constant
4966 (Entity (Expr1), Entity (Expr2)));
4969 Check_Mismatch (True);
4972 elsif Is_Entity_Name (Original_Node (Expr1))
4973 and then Is_Entity_Name (Expr2)
4975 Same_Instantiated_Constant
4976 (Entity (Original_Node (Expr1)), Entity (Expr2))
4980 elsif Nkind (Expr1) = N_Null then
4981 Check_Mismatch (Nkind (Expr1) /= N_Null);
4984 Check_Mismatch (True);
4987 elsif Ekind (E1) = E_Variable then
4988 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4990 elsif Ekind (E1) = E_Package then
4992 (Ekind (E1) /= Ekind (E2)
4993 or else Renamed_Object (E1) /= Renamed_Object (E2));
4995 elsif Is_Overloadable (E1) then
4997 -- Verify that the actual subprograms match. Note that actuals
4998 -- that are attributes are rewritten as subprograms. If the
4999 -- subprogram in the formal package is defaulted, no check is
5000 -- needed. Note that this can only happen in Ada 2005 when the
5001 -- formal package can be partially parameterized.
5003 if Nkind (Unit_Declaration_Node (E1)) =
5004 N_Subprogram_Renaming_Declaration
5005 and then From_Default (Unit_Declaration_Node (E1))
5011 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5015 raise Program_Error;
5022 end Check_Formal_Package_Instance;
5024 ---------------------------
5025 -- Check_Formal_Packages --
5026 ---------------------------
5028 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5030 Formal_P : Entity_Id;
5033 -- Iterate through the declarations in the instance, looking for package
5034 -- renaming declarations that denote instances of formal packages. Stop
5035 -- when we find the renaming of the current package itself. The
5036 -- declaration for a formal package without a box is followed by an
5037 -- internal entity that repeats the instantiation.
5039 E := First_Entity (P_Id);
5040 while Present (E) loop
5041 if Ekind (E) = E_Package then
5042 if Renamed_Object (E) = P_Id then
5045 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5048 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5049 Formal_P := Next_Entity (E);
5050 Check_Formal_Package_Instance (Formal_P, E);
5052 -- After checking, remove the internal validating package. It
5053 -- is only needed for semantic checks, and as it may contain
5054 -- generic formal declarations it should not reach gigi.
5056 Remove (Unit_Declaration_Node (Formal_P));
5062 end Check_Formal_Packages;
5064 ---------------------------------
5065 -- Check_Forward_Instantiation --
5066 ---------------------------------
5068 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5070 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5073 -- The instantiation appears before the generic body if we are in the
5074 -- scope of the unit containing the generic, either in its spec or in
5075 -- the package body, and before the generic body.
5077 if Ekind (Gen_Comp) = E_Package_Body then
5078 Gen_Comp := Spec_Entity (Gen_Comp);
5081 if In_Open_Scopes (Gen_Comp)
5082 and then No (Corresponding_Body (Decl))
5087 and then not Is_Compilation_Unit (S)
5088 and then not Is_Child_Unit (S)
5090 if Ekind (S) = E_Package then
5091 Set_Has_Forward_Instantiation (S);
5097 end Check_Forward_Instantiation;
5099 ---------------------------
5100 -- Check_Generic_Actuals --
5101 ---------------------------
5103 -- The visibility of the actuals may be different between the point of
5104 -- generic instantiation and the instantiation of the body.
5106 procedure Check_Generic_Actuals
5107 (Instance : Entity_Id;
5108 Is_Formal_Box : Boolean)
5113 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5114 -- For a formal that is an array type, the component type is often a
5115 -- previous formal in the same unit. The privacy status of the component
5116 -- type will have been examined earlier in the traversal of the
5117 -- corresponding actuals, and this status should not be modified for the
5118 -- array type itself.
5120 -- To detect this case we have to rescan the list of formals, which
5121 -- is usually short enough to ignore the resulting inefficiency.
5123 -----------------------------
5124 -- Denotes_Previous_Actual --
5125 -----------------------------
5127 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5131 Prev := First_Entity (Instance);
5132 while Present (Prev) loop
5134 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5135 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5136 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5149 end Denotes_Previous_Actual;
5151 -- Start of processing for Check_Generic_Actuals
5154 E := First_Entity (Instance);
5155 while Present (E) loop
5157 and then Nkind (Parent (E)) = N_Subtype_Declaration
5158 and then Scope (Etype (E)) /= Instance
5159 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5161 if Is_Array_Type (E)
5162 and then Denotes_Previous_Actual (Component_Type (E))
5166 Check_Private_View (Subtype_Indication (Parent (E)));
5169 Set_Is_Generic_Actual_Type (E, True);
5170 Set_Is_Hidden (E, False);
5171 Set_Is_Potentially_Use_Visible (E,
5174 -- We constructed the generic actual type as a subtype of the
5175 -- supplied type. This means that it normally would not inherit
5176 -- subtype specific attributes of the actual, which is wrong for
5177 -- the generic case.
5179 Astype := Ancestor_Subtype (E);
5183 -- This can happen when E is an itype that is the full view of
5184 -- a private type completed, e.g. with a constrained array. In
5185 -- that case, use the first subtype, which will carry size
5186 -- information. The base type itself is unconstrained and will
5189 Astype := First_Subtype (E);
5192 Set_Size_Info (E, (Astype));
5193 Set_RM_Size (E, RM_Size (Astype));
5194 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5196 if Is_Discrete_Or_Fixed_Point_Type (E) then
5197 Set_RM_Size (E, RM_Size (Astype));
5199 -- In nested instances, the base type of an access actual
5200 -- may itself be private, and need to be exchanged.
5202 elsif Is_Access_Type (E)
5203 and then Is_Private_Type (Etype (E))
5206 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5209 elsif Ekind (E) = E_Package then
5211 -- If this is the renaming for the current instance, we're done.
5212 -- Otherwise it is a formal package. If the corresponding formal
5213 -- was declared with a box, the (instantiations of the) generic
5214 -- formal part are also visible. Otherwise, ignore the entity
5215 -- created to validate the actuals.
5217 if Renamed_Object (E) = Instance then
5220 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5223 -- The visibility of a formal of an enclosing generic is already
5226 elsif Denotes_Formal_Package (E) then
5229 elsif Present (Associated_Formal_Package (E))
5230 and then not Is_Generic_Formal (E)
5232 if Box_Present (Parent (Associated_Formal_Package (E))) then
5233 Check_Generic_Actuals (Renamed_Object (E), True);
5236 Check_Generic_Actuals (Renamed_Object (E), False);
5239 Set_Is_Hidden (E, False);
5242 -- If this is a subprogram instance (in a wrapper package) the
5243 -- actual is fully visible.
5245 elsif Is_Wrapper_Package (Instance) then
5246 Set_Is_Hidden (E, False);
5248 -- If the formal package is declared with a box, or if the formal
5249 -- parameter is defaulted, it is visible in the body.
5252 or else Is_Visible_Formal (E)
5254 Set_Is_Hidden (E, False);
5257 if Ekind (E) = E_Constant then
5259 -- If the type of the actual is a private type declared in the
5260 -- enclosing scope of the generic unit, the body of the generic
5261 -- sees the full view of the type (because it has to appear in
5262 -- the corresponding package body). If the type is private now,
5263 -- exchange views to restore the proper visiblity in the instance.
5266 Typ : constant Entity_Id := Base_Type (Etype (E));
5267 -- The type of the actual
5272 Parent_Scope : Entity_Id;
5273 -- The enclosing scope of the generic unit
5276 if Is_Wrapper_Package (Instance) then
5280 (Unit_Declaration_Node
5281 (Related_Instance (Instance))));
5285 (Specification (Unit_Declaration_Node (Instance)));
5288 Parent_Scope := Scope (Gen_Id);
5290 -- The exchange is only needed if the generic is defined
5291 -- within a package which is not a common ancestor of the
5292 -- scope of the instance, and is not already in scope.
5294 if Is_Private_Type (Typ)
5295 and then Scope (Typ) = Parent_Scope
5296 and then Scope (Instance) /= Parent_Scope
5297 and then Ekind (Parent_Scope) = E_Package
5298 and then not Is_Child_Unit (Gen_Id)
5302 -- If the type of the entity is a subtype, it may also
5303 -- have to be made visible, together with the base type
5304 -- of its full view, after exchange.
5306 if Is_Private_Type (Etype (E)) then
5307 Switch_View (Etype (E));
5308 Switch_View (Base_Type (Etype (E)));
5316 end Check_Generic_Actuals;
5318 ------------------------------
5319 -- Check_Generic_Child_Unit --
5320 ------------------------------
5322 procedure Check_Generic_Child_Unit
5324 Parent_Installed : in out Boolean)
5326 Loc : constant Source_Ptr := Sloc (Gen_Id);
5327 Gen_Par : Entity_Id := Empty;
5329 Inst_Par : Entity_Id;
5332 function Find_Generic_Child
5334 Id : Node_Id) return Entity_Id;
5335 -- Search generic parent for possible child unit with the given name
5337 function In_Enclosing_Instance return Boolean;
5338 -- Within an instance of the parent, the child unit may be denoted
5339 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5340 -- scopes to locate a possible parent instantiation.
5342 ------------------------
5343 -- Find_Generic_Child --
5344 ------------------------
5346 function Find_Generic_Child
5348 Id : Node_Id) return Entity_Id
5353 -- If entity of name is already set, instance has already been
5354 -- resolved, e.g. in an enclosing instantiation.
5356 if Present (Entity (Id)) then
5357 if Scope (Entity (Id)) = Scop then
5364 E := First_Entity (Scop);
5365 while Present (E) loop
5366 if Chars (E) = Chars (Id)
5367 and then Is_Child_Unit (E)
5369 if Is_Child_Unit (E)
5370 and then not Is_Visible_Child_Unit (E)
5373 ("generic child unit& is not visible", Gen_Id, E);
5385 end Find_Generic_Child;
5387 ---------------------------
5388 -- In_Enclosing_Instance --
5389 ---------------------------
5391 function In_Enclosing_Instance return Boolean is
5392 Enclosing_Instance : Node_Id;
5393 Instance_Decl : Node_Id;
5396 -- We do not inline any call that contains instantiations, except
5397 -- for instantiations of Unchecked_Conversion, so if we are within
5398 -- an inlined body the current instance does not require parents.
5400 if In_Inlined_Body then
5401 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5405 -- Loop to check enclosing scopes
5407 Enclosing_Instance := Current_Scope;
5408 while Present (Enclosing_Instance) loop
5409 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5411 if Ekind (Enclosing_Instance) = E_Package
5412 and then Is_Generic_Instance (Enclosing_Instance)
5414 (Generic_Parent (Specification (Instance_Decl)))
5416 -- Check whether the generic we are looking for is a child of
5419 E := Find_Generic_Child
5420 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5421 exit when Present (E);
5427 Enclosing_Instance := Scope (Enclosing_Instance);
5439 Make_Expanded_Name (Loc,
5441 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5442 Selector_Name => New_Occurrence_Of (E, Loc)));
5444 Set_Entity (Gen_Id, E);
5445 Set_Etype (Gen_Id, Etype (E));
5446 Parent_Installed := False; -- Already in scope.
5449 end In_Enclosing_Instance;
5451 -- Start of processing for Check_Generic_Child_Unit
5454 -- If the name of the generic is given by a selected component, it may
5455 -- be the name of a generic child unit, and the prefix is the name of an
5456 -- instance of the parent, in which case the child unit must be visible.
5457 -- If this instance is not in scope, it must be placed there and removed
5458 -- after instantiation, because what is being instantiated is not the
5459 -- original child, but the corresponding child present in the instance
5462 -- If the child is instantiated within the parent, it can be given by
5463 -- a simple name. In this case the instance is already in scope, but
5464 -- the child generic must be recovered from the generic parent as well.
5466 if Nkind (Gen_Id) = N_Selected_Component then
5467 S := Selector_Name (Gen_Id);
5468 Analyze (Prefix (Gen_Id));
5469 Inst_Par := Entity (Prefix (Gen_Id));
5471 if Ekind (Inst_Par) = E_Package
5472 and then Present (Renamed_Object (Inst_Par))
5474 Inst_Par := Renamed_Object (Inst_Par);
5477 if Ekind (Inst_Par) = E_Package then
5478 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5479 Gen_Par := Generic_Parent (Parent (Inst_Par));
5481 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5483 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5485 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5488 elsif Ekind (Inst_Par) = E_Generic_Package
5489 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5491 -- A formal package may be a real child package, and not the
5492 -- implicit instance within a parent. In this case the child is
5493 -- not visible and has to be retrieved explicitly as well.
5495 Gen_Par := Inst_Par;
5498 if Present (Gen_Par) then
5500 -- The prefix denotes an instantiation. The entity itself may be a
5501 -- nested generic, or a child unit.
5503 E := Find_Generic_Child (Gen_Par, S);
5506 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5507 Set_Entity (Gen_Id, E);
5508 Set_Etype (Gen_Id, Etype (E));
5510 Set_Etype (S, Etype (E));
5512 -- Indicate that this is a reference to the parent
5514 if In_Extended_Main_Source_Unit (Gen_Id) then
5515 Set_Is_Instantiated (Inst_Par);
5518 -- A common mistake is to replicate the naming scheme of a
5519 -- hierarchy by instantiating a generic child directly, rather
5520 -- than the implicit child in a parent instance:
5522 -- generic .. package Gpar is ..
5523 -- generic .. package Gpar.Child is ..
5524 -- package Par is new Gpar ();
5527 -- package Par.Child is new Gpar.Child ();
5528 -- rather than Par.Child
5530 -- In this case the instantiation is within Par, which is an
5531 -- instance, but Gpar does not denote Par because we are not IN
5532 -- the instance of Gpar, so this is illegal. The test below
5533 -- recognizes this particular case.
5535 if Is_Child_Unit (E)
5536 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5537 and then (not In_Instance
5538 or else Nkind (Parent (Parent (Gen_Id))) =
5542 ("prefix of generic child unit must be instance of parent",
5546 if not In_Open_Scopes (Inst_Par)
5547 and then Nkind (Parent (Gen_Id)) not in
5548 N_Generic_Renaming_Declaration
5550 Install_Parent (Inst_Par);
5551 Parent_Installed := True;
5553 elsif In_Open_Scopes (Inst_Par) then
5555 -- If the parent is already installed, install the actuals
5556 -- for its formal packages. This is necessary when the
5557 -- child instance is a child of the parent instance:
5558 -- in this case, the parent is placed on the scope stack
5559 -- but the formal packages are not made visible.
5561 Install_Formal_Packages (Inst_Par);
5565 -- If the generic parent does not contain an entity that
5566 -- corresponds to the selector, the instance doesn't either.
5567 -- Analyzing the node will yield the appropriate error message.
5568 -- If the entity is not a child unit, then it is an inner
5569 -- generic in the parent.
5577 if Is_Child_Unit (Entity (Gen_Id))
5579 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5580 and then not In_Open_Scopes (Inst_Par)
5582 Install_Parent (Inst_Par);
5583 Parent_Installed := True;
5585 -- The generic unit may be the renaming of the implicit child
5586 -- present in an instance. In that case the parent instance is
5587 -- obtained from the name of the renamed entity.
5589 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
5590 and then Present (Renamed_Entity (Entity (Gen_Id)))
5591 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
5594 Renamed_Package : constant Node_Id :=
5595 Name (Parent (Entity (Gen_Id)));
5597 if Nkind (Renamed_Package) = N_Expanded_Name then
5598 Inst_Par := Entity (Prefix (Renamed_Package));
5599 Install_Parent (Inst_Par);
5600 Parent_Installed := True;
5606 elsif Nkind (Gen_Id) = N_Expanded_Name then
5608 -- Entity already present, analyze prefix, whose meaning may be
5609 -- an instance in the current context. If it is an instance of
5610 -- a relative within another, the proper parent may still have
5611 -- to be installed, if they are not of the same generation.
5613 Analyze (Prefix (Gen_Id));
5615 -- In the unlikely case that a local declaration hides the name
5616 -- of the parent package, locate it on the homonym chain. If the
5617 -- context is an instance of the parent, the renaming entity is
5620 Inst_Par := Entity (Prefix (Gen_Id));
5621 while Present (Inst_Par)
5622 and then not Is_Package_Or_Generic_Package (Inst_Par)
5624 Inst_Par := Homonym (Inst_Par);
5627 pragma Assert (Present (Inst_Par));
5628 Set_Entity (Prefix (Gen_Id), Inst_Par);
5630 if In_Enclosing_Instance then
5633 elsif Present (Entity (Gen_Id))
5634 and then Is_Child_Unit (Entity (Gen_Id))
5635 and then not In_Open_Scopes (Inst_Par)
5637 Install_Parent (Inst_Par);
5638 Parent_Installed := True;
5641 elsif In_Enclosing_Instance then
5643 -- The child unit is found in some enclosing scope
5650 -- If this is the renaming of the implicit child in a parent
5651 -- instance, recover the parent name and install it.
5653 if Is_Entity_Name (Gen_Id) then
5654 E := Entity (Gen_Id);
5656 if Is_Generic_Unit (E)
5657 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5658 and then Is_Child_Unit (Renamed_Object (E))
5659 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5660 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5663 New_Copy_Tree (Name (Parent (E))));
5664 Inst_Par := Entity (Prefix (Gen_Id));
5666 if not In_Open_Scopes (Inst_Par) then
5667 Install_Parent (Inst_Par);
5668 Parent_Installed := True;
5671 -- If it is a child unit of a non-generic parent, it may be
5672 -- use-visible and given by a direct name. Install parent as
5675 elsif Is_Generic_Unit (E)
5676 and then Is_Child_Unit (E)
5678 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5679 and then not Is_Generic_Unit (Scope (E))
5681 if not In_Open_Scopes (Scope (E)) then
5682 Install_Parent (Scope (E));
5683 Parent_Installed := True;
5688 end Check_Generic_Child_Unit;
5690 -----------------------------
5691 -- Check_Hidden_Child_Unit --
5692 -----------------------------
5694 procedure Check_Hidden_Child_Unit
5696 Gen_Unit : Entity_Id;
5697 Act_Decl_Id : Entity_Id)
5699 Gen_Id : constant Node_Id := Name (N);
5702 if Is_Child_Unit (Gen_Unit)
5703 and then Is_Child_Unit (Act_Decl_Id)
5704 and then Nkind (Gen_Id) = N_Expanded_Name
5705 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5706 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5708 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5710 ("generic unit & is implicitly declared in &",
5711 Defining_Unit_Name (N), Gen_Unit);
5712 Error_Msg_N ("\instance must have different name",
5713 Defining_Unit_Name (N));
5715 end Check_Hidden_Child_Unit;
5717 ------------------------
5718 -- Check_Private_View --
5719 ------------------------
5721 procedure Check_Private_View (N : Node_Id) is
5722 T : constant Entity_Id := Etype (N);
5726 -- Exchange views if the type was not private in the generic but is
5727 -- private at the point of instantiation. Do not exchange views if
5728 -- the scope of the type is in scope. This can happen if both generic
5729 -- and instance are sibling units, or if type is defined in a parent.
5730 -- In this case the visibility of the type will be correct for all
5734 BT := Base_Type (T);
5736 if Is_Private_Type (T)
5737 and then not Has_Private_View (N)
5738 and then Present (Full_View (T))
5739 and then not In_Open_Scopes (Scope (T))
5741 -- In the generic, the full type was visible. Save the private
5742 -- entity, for subsequent exchange.
5746 elsif Has_Private_View (N)
5747 and then not Is_Private_Type (T)
5748 and then not Has_Been_Exchanged (T)
5749 and then Etype (Get_Associated_Node (N)) /= T
5751 -- Only the private declaration was visible in the generic. If
5752 -- the type appears in a subtype declaration, the subtype in the
5753 -- instance must have a view compatible with that of its parent,
5754 -- which must be exchanged (see corresponding code in Restore_
5755 -- Private_Views). Otherwise, if the type is defined in a parent
5756 -- unit, leave full visibility within instance, which is safe.
5758 if In_Open_Scopes (Scope (Base_Type (T)))
5759 and then not Is_Private_Type (Base_Type (T))
5760 and then Comes_From_Source (Base_Type (T))
5764 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5765 or else not In_Private_Part (Scope (Base_Type (T)))
5767 Prepend_Elmt (T, Exchanged_Views);
5768 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5771 -- For composite types with inconsistent representation exchange
5772 -- component types accordingly.
5774 elsif Is_Access_Type (T)
5775 and then Is_Private_Type (Designated_Type (T))
5776 and then not Has_Private_View (N)
5777 and then Present (Full_View (Designated_Type (T)))
5779 Switch_View (Designated_Type (T));
5781 elsif Is_Array_Type (T) then
5782 if Is_Private_Type (Component_Type (T))
5783 and then not Has_Private_View (N)
5784 and then Present (Full_View (Component_Type (T)))
5786 Switch_View (Component_Type (T));
5789 -- The normal exchange mechanism relies on the setting of a
5790 -- flag on the reference in the generic. However, an additional
5791 -- mechanism is needed for types that are not explicitly mentioned
5792 -- in the generic, but may be needed in expanded code in the
5793 -- instance. This includes component types of arrays and
5794 -- designated types of access types. This processing must also
5795 -- include the index types of arrays which we take care of here.
5802 Indx := First_Index (T);
5803 Typ := Base_Type (Etype (Indx));
5804 while Present (Indx) loop
5805 if Is_Private_Type (Typ)
5806 and then Present (Full_View (Typ))
5815 elsif Is_Private_Type (T)
5816 and then Present (Full_View (T))
5817 and then Is_Array_Type (Full_View (T))
5818 and then Is_Private_Type (Component_Type (Full_View (T)))
5822 -- Finally, a non-private subtype may have a private base type, which
5823 -- must be exchanged for consistency. This can happen when a package
5824 -- body is instantiated, when the scope stack is empty but in fact
5825 -- the subtype and the base type are declared in an enclosing scope.
5827 -- Note that in this case we introduce an inconsistency in the view
5828 -- set, because we switch the base type BT, but there could be some
5829 -- private dependent subtypes of BT which remain unswitched. Such
5830 -- subtypes might need to be switched at a later point (see specific
5831 -- provision for that case in Switch_View).
5833 elsif not Is_Private_Type (T)
5834 and then not Has_Private_View (N)
5835 and then Is_Private_Type (BT)
5836 and then Present (Full_View (BT))
5837 and then not Is_Generic_Type (BT)
5838 and then not In_Open_Scopes (BT)
5840 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5841 Exchange_Declarations (BT);
5844 end Check_Private_View;
5846 --------------------------
5847 -- Contains_Instance_Of --
5848 --------------------------
5850 function Contains_Instance_Of
5853 N : Node_Id) return Boolean
5861 -- Verify that there are no circular instantiations. We check whether
5862 -- the unit contains an instance of the current scope or some enclosing
5863 -- scope (in case one of the instances appears in a subunit). Longer
5864 -- circularities involving subunits might seem too pathological to
5865 -- consider, but they were not too pathological for the authors of
5866 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5867 -- enclosing generic scopes as containing an instance.
5870 -- Within a generic subprogram body, the scope is not generic, to
5871 -- allow for recursive subprograms. Use the declaration to determine
5872 -- whether this is a generic unit.
5874 if Ekind (Scop) = E_Generic_Package
5875 or else (Is_Subprogram (Scop)
5876 and then Nkind (Unit_Declaration_Node (Scop)) =
5877 N_Generic_Subprogram_Declaration)
5879 Elmt := First_Elmt (Inner_Instances (Inner));
5881 while Present (Elmt) loop
5882 if Node (Elmt) = Scop then
5883 Error_Msg_Node_2 := Inner;
5885 ("circular Instantiation: & instantiated within &!",
5889 elsif Node (Elmt) = Inner then
5892 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5893 Error_Msg_Node_2 := Inner;
5895 ("circular Instantiation: & instantiated within &!",
5903 -- Indicate that Inner is being instantiated within Scop
5905 Append_Elmt (Inner, Inner_Instances (Scop));
5908 if Scop = Standard_Standard then
5911 Scop := Scope (Scop);
5916 end Contains_Instance_Of;
5918 -----------------------
5919 -- Copy_Generic_Node --
5920 -----------------------
5922 function Copy_Generic_Node
5924 Parent_Id : Node_Id;
5925 Instantiating : Boolean) return Node_Id
5930 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5931 -- Check the given value of one of the Fields referenced by the
5932 -- current node to determine whether to copy it recursively. The
5933 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5934 -- value (Sloc, Uint, Char) in which case it need not be copied.
5936 procedure Copy_Descendants;
5937 -- Common utility for various nodes
5939 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5940 -- Make copy of element list
5942 function Copy_Generic_List
5944 Parent_Id : Node_Id) return List_Id;
5945 -- Apply Copy_Node recursively to the members of a node list
5947 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5948 -- True if an identifier is part of the defining program unit name
5949 -- of a child unit. The entity of such an identifier must be kept
5950 -- (for ASIS use) even though as the name of an enclosing generic
5951 -- it would otherwise not be preserved in the generic tree.
5953 ----------------------
5954 -- Copy_Descendants --
5955 ----------------------
5957 procedure Copy_Descendants is
5959 use Atree.Unchecked_Access;
5960 -- This code section is part of the implementation of an untyped
5961 -- tree traversal, so it needs direct access to node fields.
5964 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5965 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5966 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5967 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5968 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5969 end Copy_Descendants;
5971 -----------------------------
5972 -- Copy_Generic_Descendant --
5973 -----------------------------
5975 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5977 if D = Union_Id (Empty) then
5980 elsif D in Node_Range then
5982 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5984 elsif D in List_Range then
5985 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5987 elsif D in Elist_Range then
5988 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5990 -- Nothing else is copyable (e.g. Uint values), return as is
5995 end Copy_Generic_Descendant;
5997 ------------------------
5998 -- Copy_Generic_Elist --
5999 ------------------------
6001 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
6008 M := First_Elmt (E);
6009 while Present (M) loop
6011 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6020 end Copy_Generic_Elist;
6022 -----------------------
6023 -- Copy_Generic_List --
6024 -----------------------
6026 function Copy_Generic_List
6028 Parent_Id : Node_Id) return List_Id
6036 Set_Parent (New_L, Parent_Id);
6039 while Present (N) loop
6040 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6049 end Copy_Generic_List;
6051 ---------------------------
6052 -- In_Defining_Unit_Name --
6053 ---------------------------
6055 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6057 return Present (Parent (Nam))
6058 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6060 (Nkind (Parent (Nam)) = N_Expanded_Name
6061 and then In_Defining_Unit_Name (Parent (Nam))));
6062 end In_Defining_Unit_Name;
6064 -- Start of processing for Copy_Generic_Node
6071 New_N := New_Copy (N);
6073 -- Copy aspects if present
6075 if Has_Aspects (N) then
6076 Set_Has_Aspects (New_N, False);
6077 Set_Aspect_Specifications
6078 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6081 if Instantiating then
6082 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6085 if not Is_List_Member (N) then
6086 Set_Parent (New_N, Parent_Id);
6089 -- If defining identifier, then all fields have been copied already
6091 if Nkind (New_N) in N_Entity then
6094 -- Special casing for identifiers and other entity names and operators
6096 elsif Nkind_In (New_N, N_Identifier,
6097 N_Character_Literal,
6100 or else Nkind (New_N) in N_Op
6102 if not Instantiating then
6104 -- Link both nodes in order to assign subsequently the entity of
6105 -- the copy to the original node, in case this is a global
6108 Set_Associated_Node (N, New_N);
6110 -- If we are within an instantiation, this is a nested generic
6111 -- that has already been analyzed at the point of definition. We
6112 -- must preserve references that were global to the enclosing
6113 -- parent at that point. Other occurrences, whether global or
6114 -- local to the current generic, must be resolved anew, so we
6115 -- reset the entity in the generic copy. A global reference has a
6116 -- smaller depth than the parent, or else the same depth in case
6117 -- both are distinct compilation units.
6118 -- A child unit is implicitly declared within the enclosing parent
6119 -- but is in fact global to it, and must be preserved.
6121 -- It is also possible for Current_Instantiated_Parent to be
6122 -- defined, and for this not to be a nested generic, namely if the
6123 -- unit is loaded through Rtsfind. In that case, the entity of
6124 -- New_N is only a link to the associated node, and not a defining
6127 -- The entities for parent units in the defining_program_unit of a
6128 -- generic child unit are established when the context of the unit
6129 -- is first analyzed, before the generic copy is made. They are
6130 -- preserved in the copy for use in ASIS queries.
6132 Ent := Entity (New_N);
6134 if No (Current_Instantiated_Parent.Gen_Id) then
6136 or else Nkind (Ent) /= N_Defining_Identifier
6137 or else not In_Defining_Unit_Name (N)
6139 Set_Associated_Node (New_N, Empty);
6144 not Nkind_In (Ent, N_Defining_Identifier,
6145 N_Defining_Character_Literal,
6146 N_Defining_Operator_Symbol)
6147 or else No (Scope (Ent))
6149 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6150 and then not Is_Child_Unit (Ent))
6152 (Scope_Depth (Scope (Ent)) >
6153 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6155 Get_Source_Unit (Ent) =
6156 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6158 Set_Associated_Node (New_N, Empty);
6161 -- Case of instantiating identifier or some other name or operator
6164 -- If the associated node is still defined, the entity in it is
6165 -- global, and must be copied to the instance. If this copy is
6166 -- being made for a body to inline, it is applied to an
6167 -- instantiated tree, and the entity is already present and must
6168 -- be also preserved.
6171 Assoc : constant Node_Id := Get_Associated_Node (N);
6174 if Present (Assoc) then
6175 if Nkind (Assoc) = Nkind (N) then
6176 Set_Entity (New_N, Entity (Assoc));
6177 Check_Private_View (N);
6179 elsif Nkind (Assoc) = N_Function_Call then
6180 Set_Entity (New_N, Entity (Name (Assoc)));
6182 elsif Nkind_In (Assoc, N_Defining_Identifier,
6183 N_Defining_Character_Literal,
6184 N_Defining_Operator_Symbol)
6185 and then Expander_Active
6187 -- Inlining case: we are copying a tree that contains
6188 -- global entities, which are preserved in the copy to be
6189 -- used for subsequent inlining.
6194 Set_Entity (New_N, Empty);
6200 -- For expanded name, we must copy the Prefix and Selector_Name
6202 if Nkind (N) = N_Expanded_Name then
6204 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6206 Set_Selector_Name (New_N,
6207 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6209 -- For operators, we must copy the right operand
6211 elsif Nkind (N) in N_Op then
6212 Set_Right_Opnd (New_N,
6213 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6215 -- And for binary operators, the left operand as well
6217 if Nkind (N) in N_Binary_Op then
6218 Set_Left_Opnd (New_N,
6219 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6223 -- Special casing for stubs
6225 elsif Nkind (N) in N_Body_Stub then
6227 -- In any case, we must copy the specification or defining
6228 -- identifier as appropriate.
6230 if Nkind (N) = N_Subprogram_Body_Stub then
6231 Set_Specification (New_N,
6232 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6235 Set_Defining_Identifier (New_N,
6237 (Defining_Identifier (N), New_N, Instantiating));
6240 -- If we are not instantiating, then this is where we load and
6241 -- analyze subunits, i.e. at the point where the stub occurs. A
6242 -- more permissive system might defer this analysis to the point
6243 -- of instantiation, but this seems to complicated for now.
6245 if not Instantiating then
6247 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6249 Unum : Unit_Number_Type;
6253 -- Make sure that, if it is a subunit of the main unit that is
6254 -- preprocessed and if -gnateG is specified, the preprocessed
6255 -- file will be written.
6257 Lib.Analysing_Subunit_Of_Main :=
6258 Lib.In_Extended_Main_Source_Unit (N);
6261 (Load_Name => Subunit_Name,
6265 Lib.Analysing_Subunit_Of_Main := False;
6267 -- If the proper body is not found, a warning message will be
6268 -- emitted when analyzing the stub, or later at the point
6269 -- of instantiation. Here we just leave the stub as is.
6271 if Unum = No_Unit then
6272 Subunits_Missing := True;
6273 goto Subunit_Not_Found;
6276 Subunit := Cunit (Unum);
6278 if Nkind (Unit (Subunit)) /= N_Subunit then
6280 ("found child unit instead of expected SEPARATE subunit",
6282 Error_Msg_Sloc := Sloc (N);
6283 Error_Msg_N ("\to complete stub #", Subunit);
6284 goto Subunit_Not_Found;
6287 -- We must create a generic copy of the subunit, in order to
6288 -- perform semantic analysis on it, and we must replace the
6289 -- stub in the original generic unit with the subunit, in order
6290 -- to preserve non-local references within.
6292 -- Only the proper body needs to be copied. Library_Unit and
6293 -- context clause are simply inherited by the generic copy.
6294 -- Note that the copy (which may be recursive if there are
6295 -- nested subunits) must be done first, before attaching it to
6296 -- the enclosing generic.
6300 (Proper_Body (Unit (Subunit)),
6301 Empty, Instantiating => False);
6303 -- Now place the original proper body in the original generic
6304 -- unit. This is a body, not a compilation unit.
6306 Rewrite (N, Proper_Body (Unit (Subunit)));
6307 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6308 Set_Was_Originally_Stub (N);
6310 -- Finally replace the body of the subunit with its copy, and
6311 -- make this new subunit into the library unit of the generic
6312 -- copy, which does not have stubs any longer.
6314 Set_Proper_Body (Unit (Subunit), New_Body);
6315 Set_Library_Unit (New_N, Subunit);
6316 Inherit_Context (Unit (Subunit), N);
6319 -- If we are instantiating, this must be an error case, since
6320 -- otherwise we would have replaced the stub node by the proper body
6321 -- that corresponds. So just ignore it in the copy (i.e. we have
6322 -- copied it, and that is good enough).
6328 <<Subunit_Not_Found>> null;
6330 -- If the node is a compilation unit, it is the subunit of a stub, which
6331 -- has been loaded already (see code below). In this case, the library
6332 -- unit field of N points to the parent unit (which is a compilation
6333 -- unit) and need not (and cannot!) be copied.
6335 -- When the proper body of the stub is analyzed, the library_unit link
6336 -- is used to establish the proper context (see sem_ch10).
6338 -- The other fields of a compilation unit are copied as usual
6340 elsif Nkind (N) = N_Compilation_Unit then
6342 -- This code can only be executed when not instantiating, because in
6343 -- the copy made for an instantiation, the compilation unit node has
6344 -- disappeared at the point that a stub is replaced by its proper
6347 pragma Assert (not Instantiating);
6349 Set_Context_Items (New_N,
6350 Copy_Generic_List (Context_Items (N), New_N));
6353 Copy_Generic_Node (Unit (N), New_N, False));
6355 Set_First_Inlined_Subprogram (New_N,
6357 (First_Inlined_Subprogram (N), New_N, False));
6359 Set_Aux_Decls_Node (New_N,
6360 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6362 -- For an assignment node, the assignment is known to be semantically
6363 -- legal if we are instantiating the template. This avoids incorrect
6364 -- diagnostics in generated code.
6366 elsif Nkind (N) = N_Assignment_Statement then
6368 -- Copy name and expression fields in usual manner
6371 Copy_Generic_Node (Name (N), New_N, Instantiating));
6373 Set_Expression (New_N,
6374 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6376 if Instantiating then
6377 Set_Assignment_OK (Name (New_N), True);
6380 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6381 if not Instantiating then
6382 Set_Associated_Node (N, New_N);
6385 if Present (Get_Associated_Node (N))
6386 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6388 -- In the generic the aggregate has some composite type. If at
6389 -- the point of instantiation the type has a private view,
6390 -- install the full view (and that of its ancestors, if any).
6393 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6398 and then Is_Private_Type (T)
6404 and then Is_Tagged_Type (T)
6405 and then Is_Derived_Type (T)
6407 Rt := Root_Type (T);
6412 if Is_Private_Type (T) then
6423 -- Do not copy the associated node, which points to the generic copy
6424 -- of the aggregate.
6427 use Atree.Unchecked_Access;
6428 -- This code section is part of the implementation of an untyped
6429 -- tree traversal, so it needs direct access to node fields.
6432 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6433 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6434 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6435 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6438 -- Allocators do not have an identifier denoting the access type, so we
6439 -- must locate it through the expression to check whether the views are
6442 elsif Nkind (N) = N_Allocator
6443 and then Nkind (Expression (N)) = N_Qualified_Expression
6444 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6445 and then Instantiating
6448 T : constant Node_Id :=
6449 Get_Associated_Node (Subtype_Mark (Expression (N)));
6455 -- Retrieve the allocator node in the generic copy
6457 Acc_T := Etype (Parent (Parent (T)));
6459 and then Is_Private_Type (Acc_T)
6461 Switch_View (Acc_T);
6468 -- For a proper body, we must catch the case of a proper body that
6469 -- replaces a stub. This represents the point at which a separate
6470 -- compilation unit, and hence template file, may be referenced, so we
6471 -- must make a new source instantiation entry for the template of the
6472 -- subunit, and ensure that all nodes in the subunit are adjusted using
6473 -- this new source instantiation entry.
6475 elsif Nkind (N) in N_Proper_Body then
6477 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6480 if Instantiating and then Was_Originally_Stub (N) then
6481 Create_Instantiation_Source
6482 (Instantiation_Node,
6483 Defining_Entity (N),
6488 -- Now copy the fields of the proper body, using the new
6489 -- adjustment factor if one was needed as per test above.
6493 -- Restore the original adjustment factor in case changed
6495 S_Adjustment := Save_Adjustment;
6498 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6499 -- generic unit, not to the instantiating unit.
6501 elsif Nkind (N) = N_Pragma and then Instantiating then
6503 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6505 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6506 New_N := Make_Null_Statement (Sloc (N));
6513 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
6515 -- No descendant fields need traversing
6519 elsif Nkind (N) = N_String_Literal
6520 and then Present (Etype (N))
6521 and then Instantiating
6523 -- If the string is declared in an outer scope, the string_literal
6524 -- subtype created for it may have the wrong scope. We force the
6525 -- reanalysis of the constant to generate a new itype in the proper
6528 Set_Etype (New_N, Empty);
6529 Set_Analyzed (New_N, False);
6531 -- For the remaining nodes, copy their descendants recursively
6536 if Instantiating and then Nkind (N) = N_Subprogram_Body then
6537 Set_Generic_Parent (Specification (New_N), N);
6539 -- Should preserve Corresponding_Spec??? (12.3(14))
6544 end Copy_Generic_Node;
6546 ----------------------------
6547 -- Denotes_Formal_Package --
6548 ----------------------------
6550 function Denotes_Formal_Package
6552 On_Exit : Boolean := False;
6553 Instance : Entity_Id := Empty) return Boolean
6556 Scop : constant Entity_Id := Scope (Pack);
6559 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6560 -- The package in question may be an actual for a previous formal
6561 -- package P of the current instance, so examine its actuals as well.
6562 -- This must be recursive over other formal packages.
6564 ----------------------------------
6565 -- Is_Actual_Of_Previous_Formal --
6566 ----------------------------------
6568 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6572 E1 := First_Entity (P);
6573 while Present (E1) and then E1 /= Instance loop
6574 if Ekind (E1) = E_Package
6575 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6577 if Renamed_Object (E1) = Pack then
6580 elsif E1 = P or else Renamed_Object (E1) = P then
6583 elsif Is_Actual_Of_Previous_Formal (E1) then
6592 end Is_Actual_Of_Previous_Formal;
6594 -- Start of processing for Denotes_Formal_Package
6600 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6602 Par := Current_Instantiated_Parent.Act_Id;
6605 if Ekind (Scop) = E_Generic_Package
6606 or else Nkind (Unit_Declaration_Node (Scop)) =
6607 N_Generic_Subprogram_Declaration
6611 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6612 N_Formal_Package_Declaration
6620 -- Check whether this package is associated with a formal package of
6621 -- the enclosing instantiation. Iterate over the list of renamings.
6623 E := First_Entity (Par);
6624 while Present (E) loop
6625 if Ekind (E) /= E_Package
6626 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6630 elsif Renamed_Object (E) = Par then
6633 elsif Renamed_Object (E) = Pack then
6636 elsif Is_Actual_Of_Previous_Formal (E) then
6646 end Denotes_Formal_Package;
6652 procedure End_Generic is
6654 -- ??? More things could be factored out in this routine. Should
6655 -- probably be done at a later stage.
6657 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6658 Generic_Flags.Decrement_Last;
6660 Expander_Mode_Restore;
6663 ----------------------
6664 -- Find_Actual_Type --
6665 ----------------------
6667 function Find_Actual_Type
6669 Gen_Type : Entity_Id) return Entity_Id
6671 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
6675 -- Special processing only applies to child units
6677 if not Is_Child_Unit (Gen_Scope) then
6678 return Get_Instance_Of (Typ);
6680 -- If designated or component type is itself a formal of the child unit,
6681 -- its instance is available.
6683 elsif Scope (Typ) = Gen_Scope then
6684 return Get_Instance_Of (Typ);
6686 -- If the array or access type is not declared in the parent unit,
6687 -- no special processing needed.
6689 elsif not Is_Generic_Type (Typ)
6690 and then Scope (Gen_Scope) /= Scope (Typ)
6692 return Get_Instance_Of (Typ);
6694 -- Otherwise, retrieve designated or component type by visibility
6697 T := Current_Entity (Typ);
6698 while Present (T) loop
6699 if In_Open_Scopes (Scope (T)) then
6702 elsif Is_Generic_Actual_Type (T) then
6711 end Find_Actual_Type;
6713 ----------------------------
6714 -- Freeze_Subprogram_Body --
6715 ----------------------------
6717 procedure Freeze_Subprogram_Body
6718 (Inst_Node : Node_Id;
6720 Pack_Id : Entity_Id)
6722 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6723 Par : constant Entity_Id := Scope (Gen_Unit);
6729 function Earlier (N1, N2 : Node_Id) return Boolean;
6730 -- Yields True if N1 and N2 appear in the same compilation unit,
6731 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6732 -- traversal of the tree for the unit.
6734 function Enclosing_Body (N : Node_Id) return Node_Id;
6735 -- Find innermost package body that encloses the given node, and which
6736 -- is not a compilation unit. Freeze nodes for the instance, or for its
6737 -- enclosing body, may be inserted after the enclosing_body of the
6740 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6741 -- Find entity for given package body, and locate or create a freeze
6744 function True_Parent (N : Node_Id) return Node_Id;
6745 -- For a subunit, return parent of corresponding stub
6751 function Earlier (N1, N2 : Node_Id) return Boolean is
6757 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6758 -- Find distance from given node to enclosing compilation unit
6764 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6767 and then Nkind (P) /= N_Compilation_Unit
6769 P := True_Parent (P);
6774 -- Start of processing for Earlier
6777 Find_Depth (P1, D1);
6778 Find_Depth (P2, D2);
6788 P1 := True_Parent (P1);
6793 P2 := True_Parent (P2);
6797 -- At this point P1 and P2 are at the same distance from the root.
6798 -- We examine their parents until we find a common declarative list,
6799 -- at which point we can establish their relative placement by
6800 -- comparing their ultimate slocs. If we reach the root, N1 and N2
6801 -- do not descend from the same declarative list (e.g. one is nested
6802 -- in the declarative part and the other is in a block in the
6803 -- statement part) and the earlier one is already frozen.
6805 while not Is_List_Member (P1)
6806 or else not Is_List_Member (P2)
6807 or else List_Containing (P1) /= List_Containing (P2)
6809 P1 := True_Parent (P1);
6810 P2 := True_Parent (P2);
6812 if Nkind (Parent (P1)) = N_Subunit then
6813 P1 := Corresponding_Stub (Parent (P1));
6816 if Nkind (Parent (P2)) = N_Subunit then
6817 P2 := Corresponding_Stub (Parent (P2));
6826 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6829 --------------------
6830 -- Enclosing_Body --
6831 --------------------
6833 function Enclosing_Body (N : Node_Id) return Node_Id is
6834 P : Node_Id := Parent (N);
6838 and then Nkind (Parent (P)) /= N_Compilation_Unit
6840 if Nkind (P) = N_Package_Body then
6842 if Nkind (Parent (P)) = N_Subunit then
6843 return Corresponding_Stub (Parent (P));
6849 P := True_Parent (P);
6855 -------------------------
6856 -- Package_Freeze_Node --
6857 -------------------------
6859 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6863 if Nkind (B) = N_Package_Body then
6864 Id := Corresponding_Spec (B);
6866 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6867 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6870 Ensure_Freeze_Node (Id);
6871 return Freeze_Node (Id);
6872 end Package_Freeze_Node;
6878 function True_Parent (N : Node_Id) return Node_Id is
6880 if Nkind (Parent (N)) = N_Subunit then
6881 return Parent (Corresponding_Stub (Parent (N)));
6887 -- Start of processing of Freeze_Subprogram_Body
6890 -- If the instance and the generic body appear within the same unit, and
6891 -- the instance precedes the generic, the freeze node for the instance
6892 -- must appear after that of the generic. If the generic is nested
6893 -- within another instance I2, then current instance must be frozen
6894 -- after I2. In both cases, the freeze nodes are those of enclosing
6895 -- packages. Otherwise, the freeze node is placed at the end of the
6896 -- current declarative part.
6898 Enc_G := Enclosing_Body (Gen_Body);
6899 Enc_I := Enclosing_Body (Inst_Node);
6900 Ensure_Freeze_Node (Pack_Id);
6901 F_Node := Freeze_Node (Pack_Id);
6903 if Is_Generic_Instance (Par)
6904 and then Present (Freeze_Node (Par))
6905 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6907 -- The parent was a premature instantiation. Insert freeze node at
6908 -- the end the current declarative part.
6910 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6911 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6913 -- Handle the following case:
6915 -- package Parent_Inst is new ...
6918 -- procedure P ... -- this body freezes Parent_Inst
6920 -- package Inst is new ...
6922 -- In this particular scenario, the freeze node for Inst must be
6923 -- inserted in the same manner as that of Parent_Inst - before the
6924 -- next source body or at the end of the declarative list (body not
6925 -- available). If body P did not exist and Parent_Inst was frozen
6926 -- after Inst, either by a body following Inst or at the end of the
6927 -- declarative region, the freeze node for Inst must be inserted
6928 -- after that of Parent_Inst. This relation is established by
6929 -- comparing the Slocs of Parent_Inst freeze node and Inst.
6931 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
6932 List_Containing (Inst_Node)
6933 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
6935 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6938 Insert_After (Freeze_Node (Par), F_Node);
6941 -- The body enclosing the instance should be frozen after the body that
6942 -- includes the generic, because the body of the instance may make
6943 -- references to entities therein. If the two are not in the same
6944 -- declarative part, or if the one enclosing the instance is frozen
6945 -- already, freeze the instance at the end of the current declarative
6948 elsif Is_Generic_Instance (Par)
6949 and then Present (Freeze_Node (Par))
6950 and then Present (Enc_I)
6952 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6954 (Nkind (Enc_I) = N_Package_Body
6956 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6958 -- The enclosing package may contain several instances. Rather
6959 -- than computing the earliest point at which to insert its freeze
6960 -- node, we place it at the end of the declarative part of the
6961 -- parent of the generic.
6963 Insert_Freeze_Node_For_Instance
6964 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6967 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6969 elsif Present (Enc_G)
6970 and then Present (Enc_I)
6971 and then Enc_G /= Enc_I
6972 and then Earlier (Inst_Node, Gen_Body)
6974 if Nkind (Enc_G) = N_Package_Body then
6975 E_G_Id := Corresponding_Spec (Enc_G);
6976 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6978 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6981 -- Freeze package that encloses instance, and place node after
6982 -- package that encloses generic. If enclosing package is already
6983 -- frozen we have to assume it is at the proper place. This may be a
6984 -- potential ABE that requires dynamic checking. Do not add a freeze
6985 -- node if the package that encloses the generic is inside the body
6986 -- that encloses the instance, because the freeze node would be in
6987 -- the wrong scope. Additional contortions needed if the bodies are
6988 -- within a subunit.
6991 Enclosing_Body : Node_Id;
6994 if Nkind (Enc_I) = N_Package_Body_Stub then
6995 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
6997 Enclosing_Body := Enc_I;
7000 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
7001 Insert_Freeze_Node_For_Instance
7002 (Enc_G, Package_Freeze_Node (Enc_I));
7006 -- Freeze enclosing subunit before instance
7008 Ensure_Freeze_Node (E_G_Id);
7010 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7011 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7014 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7017 -- If none of the above, insert freeze node at the end of the current
7018 -- declarative part.
7020 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7022 end Freeze_Subprogram_Body;
7028 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7030 return Generic_Renamings.Table (E).Gen_Id;
7033 ---------------------
7034 -- Get_Instance_Of --
7035 ---------------------
7037 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7038 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7041 if Res /= Assoc_Null then
7042 return Generic_Renamings.Table (Res).Act_Id;
7044 -- On exit, entity is not instantiated: not a generic parameter, or
7045 -- else parameter of an inner generic unit.
7049 end Get_Instance_Of;
7051 ------------------------------------
7052 -- Get_Package_Instantiation_Node --
7053 ------------------------------------
7055 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7056 Decl : Node_Id := Unit_Declaration_Node (A);
7060 -- If the Package_Instantiation attribute has been set on the package
7061 -- entity, then use it directly when it (or its Original_Node) refers
7062 -- to an N_Package_Instantiation node. In principle it should be
7063 -- possible to have this field set in all cases, which should be
7064 -- investigated, and would allow this function to be significantly
7067 Inst := Package_Instantiation (A);
7069 if Present (Inst) then
7070 if Nkind (Inst) = N_Package_Instantiation then
7073 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7074 return Original_Node (Inst);
7078 -- If the instantiation is a compilation unit that does not need body
7079 -- then the instantiation node has been rewritten as a package
7080 -- declaration for the instance, and we return the original node.
7082 -- If it is a compilation unit and the instance node has not been
7083 -- rewritten, then it is still the unit of the compilation. Finally, if
7084 -- a body is present, this is a parent of the main unit whose body has
7085 -- been compiled for inlining purposes, and the instantiation node has
7086 -- been rewritten with the instance body.
7088 -- Otherwise the instantiation node appears after the declaration. If
7089 -- the entity is a formal package, the declaration may have been
7090 -- rewritten as a generic declaration (in the case of a formal with box)
7091 -- or left as a formal package declaration if it has actuals, and is
7092 -- found with a forward search.
7094 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7095 if Nkind (Decl) = N_Package_Declaration
7096 and then Present (Corresponding_Body (Decl))
7098 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7101 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7102 return Original_Node (Decl);
7104 return Unit (Parent (Decl));
7107 elsif Nkind (Decl) = N_Package_Declaration
7108 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7110 return Original_Node (Decl);
7113 Inst := Next (Decl);
7114 while not Nkind_In (Inst, N_Package_Instantiation,
7115 N_Formal_Package_Declaration)
7122 end Get_Package_Instantiation_Node;
7124 ------------------------
7125 -- Has_Been_Exchanged --
7126 ------------------------
7128 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7132 Next := First_Elmt (Exchanged_Views);
7133 while Present (Next) loop
7134 if Full_View (Node (Next)) = E then
7142 end Has_Been_Exchanged;
7148 function Hash (F : Entity_Id) return HTable_Range is
7150 return HTable_Range (F mod HTable_Size);
7153 ------------------------
7154 -- Hide_Current_Scope --
7155 ------------------------
7157 procedure Hide_Current_Scope is
7158 C : constant Entity_Id := Current_Scope;
7162 Set_Is_Hidden_Open_Scope (C);
7164 E := First_Entity (C);
7165 while Present (E) loop
7166 if Is_Immediately_Visible (E) then
7167 Set_Is_Immediately_Visible (E, False);
7168 Append_Elmt (E, Hidden_Entities);
7174 -- Make the scope name invisible as well. This is necessary, but might
7175 -- conflict with calls to Rtsfind later on, in case the scope is a
7176 -- predefined one. There is no clean solution to this problem, so for
7177 -- now we depend on the user not redefining Standard itself in one of
7178 -- the parent units.
7180 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7181 Set_Is_Immediately_Visible (C, False);
7182 Append_Elmt (C, Hidden_Entities);
7185 end Hide_Current_Scope;
7191 procedure Init_Env is
7192 Saved : Instance_Env;
7195 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7196 Saved.Exchanged_Views := Exchanged_Views;
7197 Saved.Hidden_Entities := Hidden_Entities;
7198 Saved.Current_Sem_Unit := Current_Sem_Unit;
7199 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7200 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7202 -- Save configuration switches. These may be reset if the unit is a
7203 -- predefined unit, and the current mode is not Ada 2005.
7205 Save_Opt_Config_Switches (Saved.Switches);
7207 Instance_Envs.Append (Saved);
7209 Exchanged_Views := New_Elmt_List;
7210 Hidden_Entities := New_Elmt_List;
7212 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7213 -- this is set properly in Set_Instance_Env.
7215 Current_Instantiated_Parent :=
7216 (Current_Scope, Current_Scope, Assoc_Null);
7219 ------------------------------
7220 -- In_Same_Declarative_Part --
7221 ------------------------------
7223 function In_Same_Declarative_Part
7225 Inst : Node_Id) return Boolean
7227 Decls : constant Node_Id := Parent (F_Node);
7228 Nod : Node_Id := Parent (Inst);
7231 while Present (Nod) loop
7235 elsif Nkind_In (Nod, N_Subprogram_Body,
7243 elsif Nkind (Nod) = N_Subunit then
7244 Nod := Corresponding_Stub (Nod);
7246 elsif Nkind (Nod) = N_Compilation_Unit then
7250 Nod := Parent (Nod);
7255 end In_Same_Declarative_Part;
7257 ---------------------
7258 -- In_Main_Context --
7259 ---------------------
7261 function In_Main_Context (E : Entity_Id) return Boolean is
7267 if not Is_Compilation_Unit (E)
7268 or else Ekind (E) /= E_Package
7269 or else In_Private_Part (E)
7274 Context := Context_Items (Cunit (Main_Unit));
7276 Clause := First (Context);
7277 while Present (Clause) loop
7278 if Nkind (Clause) = N_With_Clause then
7279 Nam := Name (Clause);
7281 -- If the current scope is part of the context of the main unit,
7282 -- analysis of the corresponding with_clause is not complete, and
7283 -- the entity is not set. We use the Chars field directly, which
7284 -- might produce false positives in rare cases, but guarantees
7285 -- that we produce all the instance bodies we will need.
7287 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7288 or else (Nkind (Nam) = N_Selected_Component
7289 and then Chars (Selector_Name (Nam)) = Chars (E))
7299 end In_Main_Context;
7301 ---------------------
7302 -- Inherit_Context --
7303 ---------------------
7305 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7306 Current_Context : List_Id;
7307 Current_Unit : Node_Id;
7312 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7314 -- The inherited context is attached to the enclosing compilation
7315 -- unit. This is either the main unit, or the declaration for the
7316 -- main unit (in case the instantiation appears within the package
7317 -- declaration and the main unit is its body).
7319 Current_Unit := Parent (Inst);
7320 while Present (Current_Unit)
7321 and then Nkind (Current_Unit) /= N_Compilation_Unit
7323 Current_Unit := Parent (Current_Unit);
7326 Current_Context := Context_Items (Current_Unit);
7328 Item := First (Context_Items (Parent (Gen_Decl)));
7329 while Present (Item) loop
7330 if Nkind (Item) = N_With_Clause then
7332 -- Take care to prevent direct cyclic with's, which can happen
7333 -- if the generic body with's the current unit. Such a case
7334 -- would result in binder errors (or run-time errors if the
7335 -- -gnatE switch is in effect), but we want to prevent it here,
7336 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7337 -- that we don't bother to detect indirect cycles.
7339 if Library_Unit (Item) /= Current_Unit then
7340 New_I := New_Copy (Item);
7341 Set_Implicit_With (New_I, True);
7342 Append (New_I, Current_Context);
7349 end Inherit_Context;
7355 procedure Initialize is
7357 Generic_Renamings.Init;
7360 Generic_Renamings_HTable.Reset;
7361 Circularity_Detected := False;
7362 Exchanged_Views := No_Elist;
7363 Hidden_Entities := No_Elist;
7366 -------------------------------------
7367 -- Insert_Freeze_Node_For_Instance --
7368 -------------------------------------
7370 procedure Insert_Freeze_Node_For_Instance
7374 Inst : constant Entity_Id := Entity (F_Node);
7380 if not Is_List_Member (F_Node) then
7381 Decls := List_Containing (N);
7382 Par_N := Parent (Decls);
7385 -- When the instantiation occurs in a package declaration, append the
7386 -- freeze node to the private declarations (if any).
7388 if Nkind (Par_N) = N_Package_Specification
7389 and then Decls = Visible_Declarations (Par_N)
7390 and then Present (Private_Declarations (Par_N))
7391 and then not Is_Empty_List (Private_Declarations (Par_N))
7393 Decls := Private_Declarations (Par_N);
7394 Decl := First (Decls);
7397 -- Determine the proper freeze point of a package instantiation. We
7398 -- adhere to the general rule of a package or subprogram body causing
7399 -- freezing of anything before it in the same declarative region. In
7400 -- this case, the proper freeze point of a package instantiation is
7401 -- before the first source body which follows. This ensures that
7402 -- entities coming from the instance are already frozen and usable
7403 -- in source bodies.
7405 if Nkind (Par_N) /= N_Package_Declaration
7406 and then Ekind (Inst) = E_Package
7407 and then Is_Generic_Instance (Inst)
7409 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
7411 while Present (Decl) loop
7412 if Nkind_In (Decl, N_Package_Body, N_Subprogram_Body)
7413 and then Comes_From_Source (Decl)
7415 Insert_Before (Decl, F_Node);
7423 -- In a package declaration, or if no previous body, insert at end
7426 Insert_After (Last (Decls), F_Node);
7428 end Insert_Freeze_Node_For_Instance;
7434 procedure Install_Body
7435 (Act_Body : Node_Id;
7440 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
7441 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
7442 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
7443 Par : constant Entity_Id := Scope (Gen_Id);
7444 Gen_Unit : constant Node_Id :=
7445 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
7446 Orig_Body : Node_Id := Gen_Body;
7448 Body_Unit : Node_Id;
7450 Must_Delay : Boolean;
7452 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
7453 -- Find subprogram (if any) that encloses instance and/or generic body
7455 function True_Sloc (N : Node_Id) return Source_Ptr;
7456 -- If the instance is nested inside a generic unit, the Sloc of the
7457 -- instance indicates the place of the original definition, not the
7458 -- point of the current enclosing instance. Pending a better usage of
7459 -- Slocs to indicate instantiation places, we determine the place of
7460 -- origin of a node by finding the maximum sloc of any ancestor node.
7461 -- Why is this not equivalent to Top_Level_Location ???
7463 --------------------
7464 -- Enclosing_Subp --
7465 --------------------
7467 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
7468 Scop : Entity_Id := Scope (Id);
7471 while Scop /= Standard_Standard
7472 and then not Is_Overloadable (Scop)
7474 Scop := Scope (Scop);
7484 function True_Sloc (N : Node_Id) return Source_Ptr is
7491 while Present (N1) and then N1 /= Act_Unit loop
7492 if Sloc (N1) > Res then
7502 -- Start of processing for Install_Body
7506 -- If the body is a subunit, the freeze point is the corresponding stub
7507 -- in the current compilation, not the subunit itself.
7509 if Nkind (Parent (Gen_Body)) = N_Subunit then
7510 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
7512 Orig_Body := Gen_Body;
7515 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
7517 -- If the instantiation and the generic definition appear in the same
7518 -- package declaration, this is an early instantiation. If they appear
7519 -- in the same declarative part, it is an early instantiation only if
7520 -- the generic body appears textually later, and the generic body is
7521 -- also in the main unit.
7523 -- If instance is nested within a subprogram, and the generic body is
7524 -- not, the instance is delayed because the enclosing body is. If
7525 -- instance and body are within the same scope, or the same sub-
7526 -- program body, indicate explicitly that the instance is delayed.
7529 (Gen_Unit = Act_Unit
7530 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
7531 N_Generic_Package_Declaration)
7532 or else (Gen_Unit = Body_Unit
7533 and then True_Sloc (N) < Sloc (Orig_Body)))
7534 and then Is_In_Main_Unit (Gen_Unit)
7535 and then (Scope (Act_Id) = Scope (Gen_Id)
7537 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
7539 -- If this is an early instantiation, the freeze node is placed after
7540 -- the generic body. Otherwise, if the generic appears in an instance,
7541 -- we cannot freeze the current instance until the outer one is frozen.
7542 -- This is only relevant if the current instance is nested within some
7543 -- inner scope not itself within the outer instance. If this scope is
7544 -- a package body in the same declarative part as the outer instance,
7545 -- then that body needs to be frozen after the outer instance. Finally,
7546 -- if no delay is needed, we place the freeze node at the end of the
7547 -- current declarative part.
7549 if Expander_Active then
7550 Ensure_Freeze_Node (Act_Id);
7551 F_Node := Freeze_Node (Act_Id);
7554 Insert_After (Orig_Body, F_Node);
7556 elsif Is_Generic_Instance (Par)
7557 and then Present (Freeze_Node (Par))
7558 and then Scope (Act_Id) /= Par
7560 -- Freeze instance of inner generic after instance of enclosing
7563 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
7565 -- Handle the following case:
7567 -- package Parent_Inst is new ...
7570 -- procedure P ... -- this body freezes Parent_Inst
7572 -- package Inst is new ...
7574 -- In this particular scenario, the freeze node for Inst must
7575 -- be inserted in the same manner as that of Parent_Inst -
7576 -- before the next source body or at the end of the declarative
7577 -- list (body not available). If body P did not exist and
7578 -- Parent_Inst was frozen after Inst, either by a body
7579 -- following Inst or at the end of the declarative region, the
7580 -- freeze node for Inst must be inserted after that of
7581 -- Parent_Inst. This relation is established by comparing the
7582 -- Slocs of Parent_Inst freeze node and Inst.
7584 if List_Containing (Get_Package_Instantiation_Node (Par)) =
7586 and then Sloc (Freeze_Node (Par)) < Sloc (N)
7588 Insert_Freeze_Node_For_Instance (N, F_Node);
7590 Insert_After (Freeze_Node (Par), F_Node);
7593 -- Freeze package enclosing instance of inner generic after
7594 -- instance of enclosing generic.
7596 elsif Nkind (Parent (N)) = N_Package_Body
7597 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
7600 Enclosing : constant Entity_Id :=
7601 Corresponding_Spec (Parent (N));
7604 Insert_Freeze_Node_For_Instance (N, F_Node);
7605 Ensure_Freeze_Node (Enclosing);
7607 if not Is_List_Member (Freeze_Node (Enclosing)) then
7609 -- The enclosing context is a subunit, insert the freeze
7610 -- node after the stub.
7612 if Nkind (Parent (Parent (N))) = N_Subunit then
7613 Insert_Freeze_Node_For_Instance
7614 (Corresponding_Stub (Parent (Parent (N))),
7615 Freeze_Node (Enclosing));
7617 -- The parent instance has been frozen before the body of
7618 -- the enclosing package, insert the freeze node after
7621 elsif List_Containing (Freeze_Node (Par)) =
7622 List_Containing (Parent (N))
7623 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
7625 Insert_Freeze_Node_For_Instance
7626 (Parent (N), Freeze_Node (Enclosing));
7630 (Freeze_Node (Par), Freeze_Node (Enclosing));
7636 Insert_Freeze_Node_For_Instance (N, F_Node);
7640 Insert_Freeze_Node_For_Instance (N, F_Node);
7644 Set_Is_Frozen (Act_Id);
7645 Insert_Before (N, Act_Body);
7646 Mark_Rewrite_Insertion (Act_Body);
7649 -----------------------------
7650 -- Install_Formal_Packages --
7651 -----------------------------
7653 procedure Install_Formal_Packages (Par : Entity_Id) is
7656 Gen_E : Entity_Id := Empty;
7659 E := First_Entity (Par);
7661 -- In we are installing an instance parent, locate the formal packages
7662 -- of its generic parent.
7664 if Is_Generic_Instance (Par) then
7665 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
7666 Gen_E := First_Entity (Gen);
7669 while Present (E) loop
7670 if Ekind (E) = E_Package
7671 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
7673 -- If this is the renaming for the parent instance, done
7675 if Renamed_Object (E) = Par then
7678 -- The visibility of a formal of an enclosing generic is already
7681 elsif Denotes_Formal_Package (E) then
7684 elsif Present (Associated_Formal_Package (E)) then
7685 Check_Generic_Actuals (Renamed_Object (E), True);
7686 Set_Is_Hidden (E, False);
7688 -- Find formal package in generic unit that corresponds to
7689 -- (instance of) formal package in instance.
7691 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
7692 Next_Entity (Gen_E);
7695 if Present (Gen_E) then
7696 Map_Formal_Package_Entities (Gen_E, E);
7702 if Present (Gen_E) then
7703 Next_Entity (Gen_E);
7706 end Install_Formal_Packages;
7708 --------------------
7709 -- Install_Parent --
7710 --------------------
7712 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
7713 Ancestors : constant Elist_Id := New_Elmt_List;
7714 S : constant Entity_Id := Current_Scope;
7715 Inst_Par : Entity_Id;
7716 First_Par : Entity_Id;
7717 Inst_Node : Node_Id;
7718 Gen_Par : Entity_Id;
7719 First_Gen : Entity_Id;
7722 procedure Install_Noninstance_Specs (Par : Entity_Id);
7723 -- Install the scopes of noninstance parent units ending with Par
7725 procedure Install_Spec (Par : Entity_Id);
7726 -- The child unit is within the declarative part of the parent, so
7727 -- the declarations within the parent are immediately visible.
7729 -------------------------------
7730 -- Install_Noninstance_Specs --
7731 -------------------------------
7733 procedure Install_Noninstance_Specs (Par : Entity_Id) is
7736 and then Par /= Standard_Standard
7737 and then not In_Open_Scopes (Par)
7739 Install_Noninstance_Specs (Scope (Par));
7742 end Install_Noninstance_Specs;
7748 procedure Install_Spec (Par : Entity_Id) is
7749 Spec : constant Node_Id :=
7750 Specification (Unit_Declaration_Node (Par));
7753 -- If this parent of the child instance is a top-level unit,
7754 -- then record the unit and its visibility for later resetting
7755 -- in Remove_Parent. We exclude units that are generic instances,
7756 -- as we only want to record this information for the ultimate
7757 -- top-level noninstance parent (is that always correct???).
7759 if Scope (Par) = Standard_Standard
7760 and then not Is_Generic_Instance (Par)
7762 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7763 Instance_Parent_Unit := Par;
7766 -- Open the parent scope and make it and its declarations visible.
7767 -- If this point is not within a body, then only the visible
7768 -- declarations should be made visible, and installation of the
7769 -- private declarations is deferred until the appropriate point
7770 -- within analysis of the spec being instantiated (see the handling
7771 -- of parent visibility in Analyze_Package_Specification). This is
7772 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7773 -- private view problems that occur when compiling instantiations of
7774 -- a generic child of that package (Generic_Dispatching_Constructor).
7775 -- If the instance freezes a tagged type, inlinings of operations
7776 -- from Ada.Tags may need the full view of type Tag. If inlining took
7777 -- proper account of establishing visibility of inlined subprograms'
7778 -- parents then it should be possible to remove this
7779 -- special check. ???
7782 Set_Is_Immediately_Visible (Par);
7783 Install_Visible_Declarations (Par);
7784 Set_Use (Visible_Declarations (Spec));
7786 if In_Body or else Is_RTU (Par, Ada_Tags) then
7787 Install_Private_Declarations (Par);
7788 Set_Use (Private_Declarations (Spec));
7792 -- Start of processing for Install_Parent
7795 -- We need to install the parent instance to compile the instantiation
7796 -- of the child, but the child instance must appear in the current
7797 -- scope. Given that we cannot place the parent above the current scope
7798 -- in the scope stack, we duplicate the current scope and unstack both
7799 -- after the instantiation is complete.
7801 -- If the parent is itself the instantiation of a child unit, we must
7802 -- also stack the instantiation of its parent, and so on. Each such
7803 -- ancestor is the prefix of the name in a prior instantiation.
7805 -- If this is a nested instance, the parent unit itself resolves to
7806 -- a renaming of the parent instance, whose declaration we need.
7808 -- Finally, the parent may be a generic (not an instance) when the
7809 -- child unit appears as a formal package.
7813 if Present (Renamed_Entity (Inst_Par)) then
7814 Inst_Par := Renamed_Entity (Inst_Par);
7817 First_Par := Inst_Par;
7820 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7822 First_Gen := Gen_Par;
7824 while Present (Gen_Par)
7825 and then Is_Child_Unit (Gen_Par)
7827 -- Load grandparent instance as well
7829 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7831 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7832 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7834 if Present (Renamed_Entity (Inst_Par)) then
7835 Inst_Par := Renamed_Entity (Inst_Par);
7840 (Specification (Unit_Declaration_Node (Inst_Par)));
7842 if Present (Gen_Par) then
7843 Prepend_Elmt (Inst_Par, Ancestors);
7846 -- Parent is not the name of an instantiation
7848 Install_Noninstance_Specs (Inst_Par);
7860 if Present (First_Gen) then
7861 Append_Elmt (First_Par, Ancestors);
7864 Install_Noninstance_Specs (First_Par);
7867 if not Is_Empty_Elmt_List (Ancestors) then
7868 Elmt := First_Elmt (Ancestors);
7870 while Present (Elmt) loop
7871 Install_Spec (Node (Elmt));
7872 Install_Formal_Packages (Node (Elmt));
7883 --------------------------------
7884 -- Instantiate_Formal_Package --
7885 --------------------------------
7887 function Instantiate_Formal_Package
7890 Analyzed_Formal : Node_Id) return List_Id
7892 Loc : constant Source_Ptr := Sloc (Actual);
7893 Actual_Pack : Entity_Id;
7894 Formal_Pack : Entity_Id;
7895 Gen_Parent : Entity_Id;
7898 Parent_Spec : Node_Id;
7900 procedure Find_Matching_Actual
7902 Act : in out Entity_Id);
7903 -- We need to associate each formal entity in the formal package
7904 -- with the corresponding entity in the actual package. The actual
7905 -- package has been analyzed and possibly expanded, and as a result
7906 -- there is no one-to-one correspondence between the two lists (for
7907 -- example, the actual may include subtypes, itypes, and inherited
7908 -- primitive operations, interspersed among the renaming declarations
7909 -- for the actuals) . We retrieve the corresponding actual by name
7910 -- because each actual has the same name as the formal, and they do
7911 -- appear in the same order.
7913 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7914 -- Retrieve entity of defining entity of generic formal parameter.
7915 -- Only the declarations of formals need to be considered when
7916 -- linking them to actuals, but the declarative list may include
7917 -- internal entities generated during analysis, and those are ignored.
7919 procedure Match_Formal_Entity
7920 (Formal_Node : Node_Id;
7921 Formal_Ent : Entity_Id;
7922 Actual_Ent : Entity_Id);
7923 -- Associates the formal entity with the actual. In the case
7924 -- where Formal_Ent is a formal package, this procedure iterates
7925 -- through all of its formals and enters associations between the
7926 -- actuals occurring in the formal package's corresponding actual
7927 -- package (given by Actual_Ent) and the formal package's formal
7928 -- parameters. This procedure recurses if any of the parameters is
7929 -- itself a package.
7931 function Is_Instance_Of
7932 (Act_Spec : Entity_Id;
7933 Gen_Anc : Entity_Id) return Boolean;
7934 -- The actual can be an instantiation of a generic within another
7935 -- instance, in which case there is no direct link from it to the
7936 -- original generic ancestor. In that case, we recognize that the
7937 -- ultimate ancestor is the same by examining names and scopes.
7939 procedure Process_Nested_Formal (Formal : Entity_Id);
7940 -- If the current formal is declared with a box, its own formals are
7941 -- visible in the instance, as they were in the generic, and their
7942 -- Hidden flag must be reset. If some of these formals are themselves
7943 -- packages declared with a box, the processing must be recursive.
7945 --------------------------
7946 -- Find_Matching_Actual --
7947 --------------------------
7949 procedure Find_Matching_Actual
7951 Act : in out Entity_Id)
7953 Formal_Ent : Entity_Id;
7956 case Nkind (Original_Node (F)) is
7957 when N_Formal_Object_Declaration |
7958 N_Formal_Type_Declaration =>
7959 Formal_Ent := Defining_Identifier (F);
7961 while Chars (Act) /= Chars (Formal_Ent) loop
7965 when N_Formal_Subprogram_Declaration |
7966 N_Formal_Package_Declaration |
7967 N_Package_Declaration |
7968 N_Generic_Package_Declaration =>
7969 Formal_Ent := Defining_Entity (F);
7971 while Chars (Act) /= Chars (Formal_Ent) loop
7976 raise Program_Error;
7978 end Find_Matching_Actual;
7980 -------------------------
7981 -- Match_Formal_Entity --
7982 -------------------------
7984 procedure Match_Formal_Entity
7985 (Formal_Node : Node_Id;
7986 Formal_Ent : Entity_Id;
7987 Actual_Ent : Entity_Id)
7989 Act_Pkg : Entity_Id;
7992 Set_Instance_Of (Formal_Ent, Actual_Ent);
7994 if Ekind (Actual_Ent) = E_Package then
7996 -- Record associations for each parameter
7998 Act_Pkg := Actual_Ent;
8001 A_Ent : Entity_Id := First_Entity (Act_Pkg);
8010 -- Retrieve the actual given in the formal package declaration
8012 Actual := Entity (Name (Original_Node (Formal_Node)));
8014 -- The actual in the formal package declaration may be a
8015 -- renamed generic package, in which case we want to retrieve
8016 -- the original generic in order to traverse its formal part.
8018 if Present (Renamed_Entity (Actual)) then
8019 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8021 Gen_Decl := Unit_Declaration_Node (Actual);
8024 Formals := Generic_Formal_Declarations (Gen_Decl);
8026 if Present (Formals) then
8027 F_Node := First_Non_Pragma (Formals);
8032 while Present (A_Ent)
8033 and then Present (F_Node)
8034 and then A_Ent /= First_Private_Entity (Act_Pkg)
8036 F_Ent := Get_Formal_Entity (F_Node);
8038 if Present (F_Ent) then
8040 -- This is a formal of the original package. Record
8041 -- association and recurse.
8043 Find_Matching_Actual (F_Node, A_Ent);
8044 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8045 Next_Entity (A_Ent);
8048 Next_Non_Pragma (F_Node);
8052 end Match_Formal_Entity;
8054 -----------------------
8055 -- Get_Formal_Entity --
8056 -----------------------
8058 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8059 Kind : constant Node_Kind := Nkind (Original_Node (N));
8062 when N_Formal_Object_Declaration =>
8063 return Defining_Identifier (N);
8065 when N_Formal_Type_Declaration =>
8066 return Defining_Identifier (N);
8068 when N_Formal_Subprogram_Declaration =>
8069 return Defining_Unit_Name (Specification (N));
8071 when N_Formal_Package_Declaration =>
8072 return Defining_Identifier (Original_Node (N));
8074 when N_Generic_Package_Declaration =>
8075 return Defining_Identifier (Original_Node (N));
8077 -- All other declarations are introduced by semantic analysis and
8078 -- have no match in the actual.
8083 end Get_Formal_Entity;
8085 --------------------
8086 -- Is_Instance_Of --
8087 --------------------
8089 function Is_Instance_Of
8090 (Act_Spec : Entity_Id;
8091 Gen_Anc : Entity_Id) return Boolean
8093 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8096 if No (Gen_Par) then
8099 -- Simplest case: the generic parent of the actual is the formal
8101 elsif Gen_Par = Gen_Anc then
8104 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
8107 -- The actual may be obtained through several instantiations. Its
8108 -- scope must itself be an instance of a generic declared in the
8109 -- same scope as the formal. Any other case is detected above.
8111 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
8115 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
8119 ---------------------------
8120 -- Process_Nested_Formal --
8121 ---------------------------
8123 procedure Process_Nested_Formal (Formal : Entity_Id) is
8127 if Present (Associated_Formal_Package (Formal))
8128 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8130 Ent := First_Entity (Formal);
8131 while Present (Ent) loop
8132 Set_Is_Hidden (Ent, False);
8133 Set_Is_Visible_Formal (Ent);
8134 Set_Is_Potentially_Use_Visible
8135 (Ent, Is_Potentially_Use_Visible (Formal));
8137 if Ekind (Ent) = E_Package then
8138 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
8139 Process_Nested_Formal (Ent);
8145 end Process_Nested_Formal;
8147 -- Start of processing for Instantiate_Formal_Package
8152 if not Is_Entity_Name (Actual)
8153 or else Ekind (Entity (Actual)) /= E_Package
8156 ("expect package instance to instantiate formal", Actual);
8157 Abandon_Instantiation (Actual);
8158 raise Program_Error;
8161 Actual_Pack := Entity (Actual);
8162 Set_Is_Instantiated (Actual_Pack);
8164 -- The actual may be a renamed package, or an outer generic formal
8165 -- package whose instantiation is converted into a renaming.
8167 if Present (Renamed_Object (Actual_Pack)) then
8168 Actual_Pack := Renamed_Object (Actual_Pack);
8171 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
8172 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
8173 Formal_Pack := Defining_Identifier (Analyzed_Formal);
8176 Generic_Parent (Specification (Analyzed_Formal));
8178 Defining_Unit_Name (Specification (Analyzed_Formal));
8181 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
8182 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
8184 Parent_Spec := Parent (Actual_Pack);
8187 if Gen_Parent = Any_Id then
8189 ("previous error in declaration of formal package", Actual);
8190 Abandon_Instantiation (Actual);
8193 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
8199 ("actual parameter must be instance of&", Actual, Gen_Parent);
8200 Abandon_Instantiation (Actual);
8203 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
8204 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
8207 Make_Package_Renaming_Declaration (Loc,
8208 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
8209 Name => New_Reference_To (Actual_Pack, Loc));
8211 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
8212 Defining_Identifier (Formal));
8213 Decls := New_List (Nod);
8215 -- If the formal F has a box, then the generic declarations are
8216 -- visible in the generic G. In an instance of G, the corresponding
8217 -- entities in the actual for F (which are the actuals for the
8218 -- instantiation of the generic that F denotes) must also be made
8219 -- visible for analysis of the current instance. On exit from the
8220 -- current instance, those entities are made private again. If the
8221 -- actual is currently in use, these entities are also use-visible.
8223 -- The loop through the actual entities also steps through the formal
8224 -- entities and enters associations from formals to actuals into the
8225 -- renaming map. This is necessary to properly handle checking of
8226 -- actual parameter associations for later formals that depend on
8227 -- actuals declared in the formal package.
8229 -- In Ada 2005, partial parametrization requires that we make visible
8230 -- the actuals corresponding to formals that were defaulted in the
8231 -- formal package. There formals are identified because they remain
8232 -- formal generics within the formal package, rather than being
8233 -- renamings of the actuals supplied.
8236 Gen_Decl : constant Node_Id :=
8237 Unit_Declaration_Node (Gen_Parent);
8238 Formals : constant List_Id :=
8239 Generic_Formal_Declarations (Gen_Decl);
8241 Actual_Ent : Entity_Id;
8242 Actual_Of_Formal : Node_Id;
8243 Formal_Node : Node_Id;
8244 Formal_Ent : Entity_Id;
8247 if Present (Formals) then
8248 Formal_Node := First_Non_Pragma (Formals);
8250 Formal_Node := Empty;
8253 Actual_Ent := First_Entity (Actual_Pack);
8255 First (Visible_Declarations (Specification (Analyzed_Formal)));
8256 while Present (Actual_Ent)
8257 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8259 if Present (Formal_Node) then
8260 Formal_Ent := Get_Formal_Entity (Formal_Node);
8262 if Present (Formal_Ent) then
8263 Find_Matching_Actual (Formal_Node, Actual_Ent);
8265 (Formal_Node, Formal_Ent, Actual_Ent);
8267 -- We iterate at the same time over the actuals of the
8268 -- local package created for the formal, to determine
8269 -- which one of the formals of the original generic were
8270 -- defaulted in the formal. The corresponding actual
8271 -- entities are visible in the enclosing instance.
8273 if Box_Present (Formal)
8275 (Present (Actual_Of_Formal)
8278 (Get_Formal_Entity (Actual_Of_Formal)))
8280 Set_Is_Hidden (Actual_Ent, False);
8281 Set_Is_Visible_Formal (Actual_Ent);
8282 Set_Is_Potentially_Use_Visible
8283 (Actual_Ent, In_Use (Actual_Pack));
8285 if Ekind (Actual_Ent) = E_Package then
8286 Process_Nested_Formal (Actual_Ent);
8290 Set_Is_Hidden (Actual_Ent);
8291 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
8295 Next_Non_Pragma (Formal_Node);
8296 Next (Actual_Of_Formal);
8299 -- No further formals to match, but the generic part may
8300 -- contain inherited operation that are not hidden in the
8301 -- enclosing instance.
8303 Next_Entity (Actual_Ent);
8307 -- Inherited subprograms generated by formal derived types are
8308 -- also visible if the types are.
8310 Actual_Ent := First_Entity (Actual_Pack);
8311 while Present (Actual_Ent)
8312 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8314 if Is_Overloadable (Actual_Ent)
8316 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
8318 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
8320 Set_Is_Hidden (Actual_Ent, False);
8321 Set_Is_Potentially_Use_Visible
8322 (Actual_Ent, In_Use (Actual_Pack));
8325 Next_Entity (Actual_Ent);
8329 -- If the formal is not declared with a box, reanalyze it as an
8330 -- abbreviated instantiation, to verify the matching rules of 12.7.
8331 -- The actual checks are performed after the generic associations
8332 -- have been analyzed, to guarantee the same visibility for this
8333 -- instantiation and for the actuals.
8335 -- In Ada 2005, the generic associations for the formal can include
8336 -- defaulted parameters. These are ignored during check. This
8337 -- internal instantiation is removed from the tree after conformance
8338 -- checking, because it contains formal declarations for those
8339 -- defaulted parameters, and those should not reach the back-end.
8341 if not Box_Present (Formal) then
8343 I_Pack : constant Entity_Id :=
8344 Make_Temporary (Sloc (Actual), 'P');
8347 Set_Is_Internal (I_Pack);
8350 Make_Package_Instantiation (Sloc (Actual),
8351 Defining_Unit_Name => I_Pack,
8354 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
8355 Generic_Associations =>
8356 Generic_Associations (Formal)));
8362 end Instantiate_Formal_Package;
8364 -----------------------------------
8365 -- Instantiate_Formal_Subprogram --
8366 -----------------------------------
8368 function Instantiate_Formal_Subprogram
8371 Analyzed_Formal : Node_Id) return Node_Id
8374 Formal_Sub : constant Entity_Id :=
8375 Defining_Unit_Name (Specification (Formal));
8376 Analyzed_S : constant Entity_Id :=
8377 Defining_Unit_Name (Specification (Analyzed_Formal));
8378 Decl_Node : Node_Id;
8382 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
8383 -- If the generic is a child unit, the parent has been installed on the
8384 -- scope stack, but a default subprogram cannot resolve to something on
8385 -- the parent because that parent is not really part of the visible
8386 -- context (it is there to resolve explicit local entities). If the
8387 -- default has resolved in this way, we remove the entity from
8388 -- immediate visibility and analyze the node again to emit an error
8389 -- message or find another visible candidate.
8391 procedure Valid_Actual_Subprogram (Act : Node_Id);
8392 -- Perform legality check and raise exception on failure
8394 -----------------------
8395 -- From_Parent_Scope --
8396 -----------------------
8398 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
8399 Gen_Scope : Node_Id;
8402 Gen_Scope := Scope (Analyzed_S);
8403 while Present (Gen_Scope)
8404 and then Is_Child_Unit (Gen_Scope)
8406 if Scope (Subp) = Scope (Gen_Scope) then
8410 Gen_Scope := Scope (Gen_Scope);
8414 end From_Parent_Scope;
8416 -----------------------------
8417 -- Valid_Actual_Subprogram --
8418 -----------------------------
8420 procedure Valid_Actual_Subprogram (Act : Node_Id) is
8424 if Is_Entity_Name (Act) then
8425 Act_E := Entity (Act);
8427 elsif Nkind (Act) = N_Selected_Component
8428 and then Is_Entity_Name (Selector_Name (Act))
8430 Act_E := Entity (Selector_Name (Act));
8436 if (Present (Act_E) and then Is_Overloadable (Act_E))
8437 or else Nkind_In (Act, N_Attribute_Reference,
8438 N_Indexed_Component,
8439 N_Character_Literal,
8440 N_Explicit_Dereference)
8446 ("expect subprogram or entry name in instantiation of&",
8447 Instantiation_Node, Formal_Sub);
8448 Abandon_Instantiation (Instantiation_Node);
8450 end Valid_Actual_Subprogram;
8452 -- Start of processing for Instantiate_Formal_Subprogram
8455 New_Spec := New_Copy_Tree (Specification (Formal));
8457 -- The tree copy has created the proper instantiation sloc for the
8458 -- new specification. Use this location for all other constructed
8461 Loc := Sloc (Defining_Unit_Name (New_Spec));
8463 -- Create new entity for the actual (New_Copy_Tree does not)
8465 Set_Defining_Unit_Name
8466 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8468 -- Create new entities for the each of the formals in the
8469 -- specification of the renaming declaration built for the actual.
8471 if Present (Parameter_Specifications (New_Spec)) then
8475 F := First (Parameter_Specifications (New_Spec));
8476 while Present (F) loop
8477 Set_Defining_Identifier (F,
8478 Make_Defining_Identifier (Sloc (F),
8479 Chars => Chars (Defining_Identifier (F))));
8485 -- Find entity of actual. If the actual is an attribute reference, it
8486 -- cannot be resolved here (its formal is missing) but is handled
8487 -- instead in Attribute_Renaming. If the actual is overloaded, it is
8488 -- fully resolved subsequently, when the renaming declaration for the
8489 -- formal is analyzed. If it is an explicit dereference, resolve the
8490 -- prefix but not the actual itself, to prevent interpretation as call.
8492 if Present (Actual) then
8493 Loc := Sloc (Actual);
8494 Set_Sloc (New_Spec, Loc);
8496 if Nkind (Actual) = N_Operator_Symbol then
8497 Find_Direct_Name (Actual);
8499 elsif Nkind (Actual) = N_Explicit_Dereference then
8500 Analyze (Prefix (Actual));
8502 elsif Nkind (Actual) /= N_Attribute_Reference then
8506 Valid_Actual_Subprogram (Actual);
8509 elsif Present (Default_Name (Formal)) then
8510 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
8511 N_Selected_Component,
8512 N_Indexed_Component,
8513 N_Character_Literal)
8514 and then Present (Entity (Default_Name (Formal)))
8516 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
8518 Nam := New_Copy (Default_Name (Formal));
8519 Set_Sloc (Nam, Loc);
8522 elsif Box_Present (Formal) then
8524 -- Actual is resolved at the point of instantiation. Create an
8525 -- identifier or operator with the same name as the formal.
8527 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
8528 Nam := Make_Operator_Symbol (Loc,
8529 Chars => Chars (Formal_Sub),
8530 Strval => No_String);
8532 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
8535 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
8536 and then Null_Present (Specification (Formal))
8538 -- Generate null body for procedure, for use in the instance
8541 Make_Subprogram_Body (Loc,
8542 Specification => New_Spec,
8543 Declarations => New_List,
8544 Handled_Statement_Sequence =>
8545 Make_Handled_Sequence_Of_Statements (Loc,
8546 Statements => New_List (Make_Null_Statement (Loc))));
8548 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
8552 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
8554 ("missing actual&", Instantiation_Node, Formal_Sub);
8556 ("\in instantiation of & declared#",
8557 Instantiation_Node, Scope (Analyzed_S));
8558 Abandon_Instantiation (Instantiation_Node);
8562 Make_Subprogram_Renaming_Declaration (Loc,
8563 Specification => New_Spec,
8566 -- If we do not have an actual and the formal specified <> then set to
8567 -- get proper default.
8569 if No (Actual) and then Box_Present (Formal) then
8570 Set_From_Default (Decl_Node);
8573 -- Gather possible interpretations for the actual before analyzing the
8574 -- instance. If overloaded, it will be resolved when analyzing the
8575 -- renaming declaration.
8577 if Box_Present (Formal)
8578 and then No (Actual)
8582 if Is_Child_Unit (Scope (Analyzed_S))
8583 and then Present (Entity (Nam))
8585 if not Is_Overloaded (Nam) then
8587 if From_Parent_Scope (Entity (Nam)) then
8588 Set_Is_Immediately_Visible (Entity (Nam), False);
8589 Set_Entity (Nam, Empty);
8590 Set_Etype (Nam, Empty);
8594 Set_Is_Immediately_Visible (Entity (Nam));
8603 Get_First_Interp (Nam, I, It);
8605 while Present (It.Nam) loop
8606 if From_Parent_Scope (It.Nam) then
8610 Get_Next_Interp (I, It);
8617 -- The generic instantiation freezes the actual. This can only be done
8618 -- once the actual is resolved, in the analysis of the renaming
8619 -- declaration. To make the formal subprogram entity available, we set
8620 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8621 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8622 -- of formal abstract subprograms.
8624 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
8626 -- We cannot analyze the renaming declaration, and thus find the actual,
8627 -- until all the actuals are assembled in the instance. For subsequent
8628 -- checks of other actuals, indicate the node that will hold the
8629 -- instance of this formal.
8631 Set_Instance_Of (Analyzed_S, Nam);
8633 if Nkind (Actual) = N_Selected_Component
8634 and then Is_Task_Type (Etype (Prefix (Actual)))
8635 and then not Is_Frozen (Etype (Prefix (Actual)))
8637 -- The renaming declaration will create a body, which must appear
8638 -- outside of the instantiation, We move the renaming declaration
8639 -- out of the instance, and create an additional renaming inside,
8640 -- to prevent freezing anomalies.
8643 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
8646 Set_Defining_Unit_Name (New_Spec, Anon_Id);
8647 Insert_Before (Instantiation_Node, Decl_Node);
8648 Analyze (Decl_Node);
8650 -- Now create renaming within the instance
8653 Make_Subprogram_Renaming_Declaration (Loc,
8654 Specification => New_Copy_Tree (New_Spec),
8655 Name => New_Occurrence_Of (Anon_Id, Loc));
8657 Set_Defining_Unit_Name (Specification (Decl_Node),
8658 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8663 end Instantiate_Formal_Subprogram;
8665 ------------------------
8666 -- Instantiate_Object --
8667 ------------------------
8669 function Instantiate_Object
8672 Analyzed_Formal : Node_Id) return List_Id
8674 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
8675 A_Gen_Obj : constant Entity_Id :=
8676 Defining_Identifier (Analyzed_Formal);
8677 Acc_Def : Node_Id := Empty;
8678 Act_Assoc : constant Node_Id := Parent (Actual);
8679 Actual_Decl : Node_Id := Empty;
8680 Decl_Node : Node_Id;
8683 List : constant List_Id := New_List;
8684 Loc : constant Source_Ptr := Sloc (Actual);
8685 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
8686 Subt_Decl : Node_Id := Empty;
8687 Subt_Mark : Node_Id := Empty;
8690 if Present (Subtype_Mark (Formal)) then
8691 Subt_Mark := Subtype_Mark (Formal);
8693 Check_Access_Definition (Formal);
8694 Acc_Def := Access_Definition (Formal);
8697 -- Sloc for error message on missing actual
8699 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
8701 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
8702 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8705 Set_Parent (List, Parent (Actual));
8709 if Out_Present (Formal) then
8711 -- An IN OUT generic actual must be a name. The instantiation is a
8712 -- renaming declaration. The actual is the name being renamed. We
8713 -- use the actual directly, rather than a copy, because it is not
8714 -- used further in the list of actuals, and because a copy or a use
8715 -- of relocate_node is incorrect if the instance is nested within a
8716 -- generic. In order to simplify ASIS searches, the Generic_Parent
8717 -- field links the declaration to the generic association.
8722 Instantiation_Node, Gen_Obj);
8724 ("\in instantiation of & declared#",
8725 Instantiation_Node, Scope (A_Gen_Obj));
8726 Abandon_Instantiation (Instantiation_Node);
8729 if Present (Subt_Mark) then
8731 Make_Object_Renaming_Declaration (Loc,
8732 Defining_Identifier => New_Copy (Gen_Obj),
8733 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8736 else pragma Assert (Present (Acc_Def));
8738 Make_Object_Renaming_Declaration (Loc,
8739 Defining_Identifier => New_Copy (Gen_Obj),
8740 Access_Definition => New_Copy_Tree (Acc_Def),
8744 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8746 -- The analysis of the actual may produce insert_action nodes, so
8747 -- the declaration must have a context in which to attach them.
8749 Append (Decl_Node, List);
8752 -- Return if the analysis of the actual reported some error
8754 if Etype (Actual) = Any_Type then
8758 -- This check is performed here because Analyze_Object_Renaming will
8759 -- not check it when Comes_From_Source is False. Note though that the
8760 -- check for the actual being the name of an object will be performed
8761 -- in Analyze_Object_Renaming.
8763 if Is_Object_Reference (Actual)
8764 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8767 ("illegal discriminant-dependent component for in out parameter",
8771 -- The actual has to be resolved in order to check that it is a
8772 -- variable (due to cases such as F (1), where F returns access to an
8773 -- array, and for overloaded prefixes).
8775 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
8777 -- If the type of the formal is not itself a formal, and the
8778 -- current unit is a child unit, the formal type must be declared
8779 -- in a parent, and must be retrieved by visibility.
8782 and then Is_Generic_Unit (Scope (Ftyp))
8783 and then Is_Child_Unit (Scope (A_Gen_Obj))
8786 Temp : constant Node_Id :=
8787 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
8789 Set_Entity (Temp, Empty);
8791 Ftyp := Entity (Temp);
8795 if Is_Private_Type (Ftyp)
8796 and then not Is_Private_Type (Etype (Actual))
8797 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8798 or else Base_Type (Etype (Actual)) = Ftyp)
8800 -- If the actual has the type of the full view of the formal, or
8801 -- else a non-private subtype of the formal, then the visibility
8802 -- of the formal type has changed. Add to the actuals a subtype
8803 -- declaration that will force the exchange of views in the body
8804 -- of the instance as well.
8807 Make_Subtype_Declaration (Loc,
8808 Defining_Identifier => Make_Temporary (Loc, 'P'),
8809 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8811 Prepend (Subt_Decl, List);
8813 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8814 Exchange_Declarations (Ftyp);
8817 Resolve (Actual, Ftyp);
8819 if not Denotes_Variable (Actual) then
8821 ("actual for& must be a variable", Actual, Gen_Obj);
8823 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8825 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8826 -- the type of the actual shall resolve to a specific anonymous
8829 if Ada_Version < Ada_2005
8831 Ekind (Base_Type (Ftyp)) /=
8832 E_Anonymous_Access_Type
8834 Ekind (Base_Type (Etype (Actual))) /=
8835 E_Anonymous_Access_Type
8837 Error_Msg_NE ("type of actual does not match type of&",
8842 Note_Possible_Modification (Actual, Sure => True);
8844 -- Check for instantiation of atomic/volatile actual for
8845 -- non-atomic/volatile formal (RM C.6 (12)).
8847 if Is_Atomic_Object (Actual)
8848 and then not Is_Atomic (Orig_Ftyp)
8851 ("cannot instantiate non-atomic formal object " &
8852 "with atomic actual", Actual);
8854 elsif Is_Volatile_Object (Actual)
8855 and then not Is_Volatile (Orig_Ftyp)
8858 ("cannot instantiate non-volatile formal object " &
8859 "with volatile actual", Actual);
8862 -- Formal in-parameter
8865 -- The instantiation of a generic formal in-parameter is constant
8866 -- declaration. The actual is the expression for that declaration.
8868 if Present (Actual) then
8869 if Present (Subt_Mark) then
8871 else pragma Assert (Present (Acc_Def));
8876 Make_Object_Declaration (Loc,
8877 Defining_Identifier => New_Copy (Gen_Obj),
8878 Constant_Present => True,
8879 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8880 Object_Definition => New_Copy_Tree (Def),
8881 Expression => Actual);
8883 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8885 -- A generic formal object of a tagged type is defined to be
8886 -- aliased so the new constant must also be treated as aliased.
8888 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
8889 Set_Aliased_Present (Decl_Node);
8892 Append (Decl_Node, List);
8894 -- No need to repeat (pre-)analysis of some expression nodes
8895 -- already handled in Preanalyze_Actuals.
8897 if Nkind (Actual) /= N_Allocator then
8900 -- Return if the analysis of the actual reported some error
8902 if Etype (Actual) = Any_Type then
8908 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
8912 Typ := Get_Instance_Of (Formal_Type);
8914 Freeze_Before (Instantiation_Node, Typ);
8916 -- If the actual is an aggregate, perform name resolution on
8917 -- its components (the analysis of an aggregate does not do it)
8918 -- to capture local names that may be hidden if the generic is
8921 if Nkind (Actual) = N_Aggregate then
8922 Preanalyze_And_Resolve (Actual, Typ);
8925 if Is_Limited_Type (Typ)
8926 and then not OK_For_Limited_Init (Typ, Actual)
8929 ("initialization not allowed for limited types", Actual);
8930 Explain_Limited_Type (Typ, Actual);
8934 elsif Present (Default_Expression (Formal)) then
8936 -- Use default to construct declaration
8938 if Present (Subt_Mark) then
8940 else pragma Assert (Present (Acc_Def));
8945 Make_Object_Declaration (Sloc (Formal),
8946 Defining_Identifier => New_Copy (Gen_Obj),
8947 Constant_Present => True,
8948 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8949 Object_Definition => New_Copy (Def),
8950 Expression => New_Copy_Tree
8951 (Default_Expression (Formal)));
8953 Append (Decl_Node, List);
8954 Set_Analyzed (Expression (Decl_Node), False);
8959 Instantiation_Node, Gen_Obj);
8960 Error_Msg_NE ("\in instantiation of & declared#",
8961 Instantiation_Node, Scope (A_Gen_Obj));
8963 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
8965 -- Create dummy constant declaration so that instance can be
8966 -- analyzed, to minimize cascaded visibility errors.
8968 if Present (Subt_Mark) then
8970 else pragma Assert (Present (Acc_Def));
8975 Make_Object_Declaration (Loc,
8976 Defining_Identifier => New_Copy (Gen_Obj),
8977 Constant_Present => True,
8978 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8979 Object_Definition => New_Copy (Def),
8981 Make_Attribute_Reference (Sloc (Gen_Obj),
8982 Attribute_Name => Name_First,
8983 Prefix => New_Copy (Def)));
8985 Append (Decl_Node, List);
8988 Abandon_Instantiation (Instantiation_Node);
8993 if Nkind (Actual) in N_Has_Entity then
8994 Actual_Decl := Parent (Entity (Actual));
8997 -- Ada 2005 (AI-423): For a formal object declaration with a null
8998 -- exclusion or an access definition that has a null exclusion: If the
8999 -- actual matching the formal object declaration denotes a generic
9000 -- formal object of another generic unit G, and the instantiation
9001 -- containing the actual occurs within the body of G or within the body
9002 -- of a generic unit declared within the declarative region of G, then
9003 -- the declaration of the formal object of G must have a null exclusion.
9004 -- Otherwise, the subtype of the actual matching the formal object
9005 -- declaration shall exclude null.
9007 if Ada_Version >= Ada_2005
9008 and then Present (Actual_Decl)
9010 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9011 N_Object_Declaration)
9012 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9013 and then not Has_Null_Exclusion (Actual_Decl)
9014 and then Has_Null_Exclusion (Analyzed_Formal)
9016 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9018 ("actual must exclude null to match generic formal#", Actual);
9022 end Instantiate_Object;
9024 ------------------------------
9025 -- Instantiate_Package_Body --
9026 ------------------------------
9028 procedure Instantiate_Package_Body
9029 (Body_Info : Pending_Body_Info;
9030 Inlined_Body : Boolean := False;
9031 Body_Optional : Boolean := False)
9033 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9034 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9035 Loc : constant Source_Ptr := Sloc (Inst_Node);
9037 Gen_Id : constant Node_Id := Name (Inst_Node);
9038 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9039 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9040 Act_Spec : constant Node_Id := Specification (Act_Decl);
9041 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9043 Act_Body_Name : Node_Id;
9045 Gen_Body_Id : Node_Id;
9047 Act_Body_Id : Entity_Id;
9049 Parent_Installed : Boolean := False;
9050 Save_Style_Check : constant Boolean := Style_Check;
9052 Par_Ent : Entity_Id := Empty;
9053 Par_Vis : Boolean := False;
9056 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9058 -- The instance body may already have been processed, as the parent of
9059 -- another instance that is inlined (Load_Parent_Of_Generic).
9061 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
9065 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9067 -- Re-establish the state of information on which checks are suppressed.
9068 -- This information was set in Body_Info at the point of instantiation,
9069 -- and now we restore it so that the instance is compiled using the
9070 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9072 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9073 Scope_Suppress := Body_Info.Scope_Suppress;
9074 Opt.Ada_Version := Body_Info.Version;
9076 if No (Gen_Body_Id) then
9077 Load_Parent_Of_Generic
9078 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9079 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9082 -- Establish global variable for sloc adjustment and for error recovery
9084 Instantiation_Node := Inst_Node;
9086 if Present (Gen_Body_Id) then
9087 Save_Env (Gen_Unit, Act_Decl_Id);
9088 Style_Check := False;
9089 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9091 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9093 Create_Instantiation_Source
9094 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
9098 (Original_Node (Gen_Body), Empty, Instantiating => True);
9100 -- Build new name (possibly qualified) for body declaration
9102 Act_Body_Id := New_Copy (Act_Decl_Id);
9104 -- Some attributes of spec entity are not inherited by body entity
9106 Set_Handler_Records (Act_Body_Id, No_List);
9108 if Nkind (Defining_Unit_Name (Act_Spec)) =
9109 N_Defining_Program_Unit_Name
9112 Make_Defining_Program_Unit_Name (Loc,
9113 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
9114 Defining_Identifier => Act_Body_Id);
9116 Act_Body_Name := Act_Body_Id;
9119 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
9121 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
9122 Check_Generic_Actuals (Act_Decl_Id, False);
9124 -- If it is a child unit, make the parent instance (which is an
9125 -- instance of the parent of the generic) visible. The parent
9126 -- instance is the prefix of the name of the generic unit.
9128 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9129 and then Nkind (Gen_Id) = N_Expanded_Name
9131 Par_Ent := Entity (Prefix (Gen_Id));
9132 Par_Vis := Is_Immediately_Visible (Par_Ent);
9133 Install_Parent (Par_Ent, In_Body => True);
9134 Parent_Installed := True;
9136 elsif Is_Child_Unit (Gen_Unit) then
9137 Par_Ent := Scope (Gen_Unit);
9138 Par_Vis := Is_Immediately_Visible (Par_Ent);
9139 Install_Parent (Par_Ent, In_Body => True);
9140 Parent_Installed := True;
9143 -- If the instantiation is a library unit, and this is the main unit,
9144 -- then build the resulting compilation unit nodes for the instance.
9145 -- If this is a compilation unit but it is not the main unit, then it
9146 -- is the body of a unit in the context, that is being compiled
9147 -- because it is encloses some inlined unit or another generic unit
9148 -- being instantiated. In that case, this body is not part of the
9149 -- current compilation, and is not attached to the tree, but its
9150 -- parent must be set for analysis.
9152 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9154 -- Replace instance node with body of instance, and create new
9155 -- node for corresponding instance declaration.
9157 Build_Instance_Compilation_Unit_Nodes
9158 (Inst_Node, Act_Body, Act_Decl);
9159 Analyze (Inst_Node);
9161 if Parent (Inst_Node) = Cunit (Main_Unit) then
9163 -- If the instance is a child unit itself, then set the scope
9164 -- of the expanded body to be the parent of the instantiation
9165 -- (ensuring that the fully qualified name will be generated
9166 -- for the elaboration subprogram).
9168 if Nkind (Defining_Unit_Name (Act_Spec)) =
9169 N_Defining_Program_Unit_Name
9172 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
9176 -- Case where instantiation is not a library unit
9179 -- If this is an early instantiation, i.e. appears textually
9180 -- before the corresponding body and must be elaborated first,
9181 -- indicate that the body instance is to be delayed.
9183 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
9185 -- Now analyze the body. We turn off all checks if this is an
9186 -- internal unit, since there is no reason to have checks on for
9187 -- any predefined run-time library code. All such code is designed
9188 -- to be compiled with checks off.
9190 -- Note that we do NOT apply this criterion to children of GNAT
9191 -- (or on VMS, children of DEC). The latter units must suppress
9192 -- checks explicitly if this is needed.
9194 if Is_Predefined_File_Name
9195 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
9197 Analyze (Act_Body, Suppress => All_Checks);
9203 Inherit_Context (Gen_Body, Inst_Node);
9205 -- Remove the parent instances if they have been placed on the scope
9206 -- stack to compile the body.
9208 if Parent_Installed then
9209 Remove_Parent (In_Body => True);
9211 -- Restore the previous visibility of the parent
9213 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9216 Restore_Private_Views (Act_Decl_Id);
9218 -- Remove the current unit from visibility if this is an instance
9219 -- that is not elaborated on the fly for inlining purposes.
9221 if not Inlined_Body then
9222 Set_Is_Immediately_Visible (Act_Decl_Id, False);
9226 Style_Check := Save_Style_Check;
9228 -- If we have no body, and the unit requires a body, then complain. This
9229 -- complaint is suppressed if we have detected other errors (since a
9230 -- common reason for missing the body is that it had errors).
9231 -- In CodePeer mode, a warning has been emitted already, no need for
9232 -- further messages.
9234 elsif Unit_Requires_Body (Gen_Unit)
9235 and then not Body_Optional
9237 if CodePeer_Mode then
9240 elsif Serious_Errors_Detected = 0 then
9242 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
9244 -- Don't attempt to perform any cleanup actions if some other error
9245 -- was already detected, since this can cause blowups.
9251 -- Case of package that does not need a body
9254 -- If the instantiation of the declaration is a library unit, rewrite
9255 -- the original package instantiation as a package declaration in the
9256 -- compilation unit node.
9258 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9259 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
9260 Rewrite (Inst_Node, Act_Decl);
9262 -- Generate elaboration entity, in case spec has elaboration code.
9263 -- This cannot be done when the instance is analyzed, because it
9264 -- is not known yet whether the body exists.
9266 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
9267 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
9269 -- If the instantiation is not a library unit, then append the
9270 -- declaration to the list of implicitly generated entities, unless
9271 -- it is already a list member which means that it was already
9274 elsif not Is_List_Member (Act_Decl) then
9275 Mark_Rewrite_Insertion (Act_Decl);
9276 Insert_Before (Inst_Node, Act_Decl);
9280 Expander_Mode_Restore;
9281 end Instantiate_Package_Body;
9283 ---------------------------------
9284 -- Instantiate_Subprogram_Body --
9285 ---------------------------------
9287 procedure Instantiate_Subprogram_Body
9288 (Body_Info : Pending_Body_Info;
9289 Body_Optional : Boolean := False)
9291 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9292 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9293 Loc : constant Source_Ptr := Sloc (Inst_Node);
9294 Gen_Id : constant Node_Id := Name (Inst_Node);
9295 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9296 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9297 Anon_Id : constant Entity_Id :=
9298 Defining_Unit_Name (Specification (Act_Decl));
9299 Pack_Id : constant Entity_Id :=
9300 Defining_Unit_Name (Parent (Act_Decl));
9303 Gen_Body_Id : Node_Id;
9305 Pack_Body : Node_Id;
9306 Prev_Formal : Entity_Id;
9308 Unit_Renaming : Node_Id;
9310 Parent_Installed : Boolean := False;
9311 Save_Style_Check : constant Boolean := Style_Check;
9313 Par_Ent : Entity_Id := Empty;
9314 Par_Vis : Boolean := False;
9317 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9319 -- Subprogram body may have been created already because of an inline
9320 -- pragma, or because of multiple elaborations of the enclosing package
9321 -- when several instances of the subprogram appear in the main unit.
9323 if Present (Corresponding_Body (Act_Decl)) then
9327 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9329 -- Re-establish the state of information on which checks are suppressed.
9330 -- This information was set in Body_Info at the point of instantiation,
9331 -- and now we restore it so that the instance is compiled using the
9332 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9334 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9335 Scope_Suppress := Body_Info.Scope_Suppress;
9336 Opt.Ada_Version := Body_Info.Version;
9338 if No (Gen_Body_Id) then
9340 -- For imported generic subprogram, no body to compile, complete
9341 -- the spec entity appropriately.
9343 if Is_Imported (Gen_Unit) then
9344 Set_Is_Imported (Anon_Id);
9345 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
9346 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
9347 Set_Convention (Anon_Id, Convention (Gen_Unit));
9348 Set_Has_Completion (Anon_Id);
9351 -- For other cases, compile the body
9354 Load_Parent_Of_Generic
9355 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9356 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9360 Instantiation_Node := Inst_Node;
9362 if Present (Gen_Body_Id) then
9363 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9365 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
9367 -- Either body is not present, or context is non-expanding, as
9368 -- when compiling a subunit. Mark the instance as completed, and
9369 -- diagnose a missing body when needed.
9372 and then Operating_Mode = Generate_Code
9375 ("missing proper body for instantiation", Gen_Body);
9378 Set_Has_Completion (Anon_Id);
9382 Save_Env (Gen_Unit, Anon_Id);
9383 Style_Check := False;
9384 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9385 Create_Instantiation_Source
9393 (Original_Node (Gen_Body), Empty, Instantiating => True);
9395 -- Create proper defining name for the body, to correspond to
9396 -- the one in the spec.
9398 Set_Defining_Unit_Name (Specification (Act_Body),
9399 Make_Defining_Identifier
9400 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
9401 Set_Corresponding_Spec (Act_Body, Anon_Id);
9402 Set_Has_Completion (Anon_Id);
9403 Check_Generic_Actuals (Pack_Id, False);
9405 -- Generate a reference to link the visible subprogram instance to
9406 -- the generic body, which for navigation purposes is the only
9407 -- available source for the instance.
9410 (Related_Instance (Pack_Id),
9411 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
9413 -- If it is a child unit, make the parent instance (which is an
9414 -- instance of the parent of the generic) visible. The parent
9415 -- instance is the prefix of the name of the generic unit.
9417 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9418 and then Nkind (Gen_Id) = N_Expanded_Name
9420 Par_Ent := Entity (Prefix (Gen_Id));
9421 Par_Vis := Is_Immediately_Visible (Par_Ent);
9422 Install_Parent (Par_Ent, In_Body => True);
9423 Parent_Installed := True;
9425 elsif Is_Child_Unit (Gen_Unit) then
9426 Par_Ent := Scope (Gen_Unit);
9427 Par_Vis := Is_Immediately_Visible (Par_Ent);
9428 Install_Parent (Par_Ent, In_Body => True);
9429 Parent_Installed := True;
9432 -- Inside its body, a reference to the generic unit is a reference
9433 -- to the instance. The corresponding renaming is the first
9434 -- declaration in the body.
9437 Make_Subprogram_Renaming_Declaration (Loc,
9440 Specification (Original_Node (Gen_Body)),
9442 Instantiating => True),
9443 Name => New_Occurrence_Of (Anon_Id, Loc));
9445 -- If there is a formal subprogram with the same name as the unit
9446 -- itself, do not add this renaming declaration. This is a temporary
9447 -- fix for one ACVC test. ???
9449 Prev_Formal := First_Entity (Pack_Id);
9450 while Present (Prev_Formal) loop
9451 if Chars (Prev_Formal) = Chars (Gen_Unit)
9452 and then Is_Overloadable (Prev_Formal)
9457 Next_Entity (Prev_Formal);
9460 if Present (Prev_Formal) then
9461 Decls := New_List (Act_Body);
9463 Decls := New_List (Unit_Renaming, Act_Body);
9466 -- The subprogram body is placed in the body of a dummy package body,
9467 -- whose spec contains the subprogram declaration as well as the
9468 -- renaming declarations for the generic parameters.
9470 Pack_Body := Make_Package_Body (Loc,
9471 Defining_Unit_Name => New_Copy (Pack_Id),
9472 Declarations => Decls);
9474 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9476 -- If the instantiation is a library unit, then build resulting
9477 -- compilation unit nodes for the instance. The declaration of
9478 -- the enclosing package is the grandparent of the subprogram
9479 -- declaration. First replace the instantiation node as the unit
9480 -- of the corresponding compilation.
9482 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9483 if Parent (Inst_Node) = Cunit (Main_Unit) then
9484 Set_Unit (Parent (Inst_Node), Inst_Node);
9485 Build_Instance_Compilation_Unit_Nodes
9486 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
9487 Analyze (Inst_Node);
9489 Set_Parent (Pack_Body, Parent (Inst_Node));
9490 Analyze (Pack_Body);
9494 Insert_Before (Inst_Node, Pack_Body);
9495 Mark_Rewrite_Insertion (Pack_Body);
9496 Analyze (Pack_Body);
9498 if Expander_Active then
9499 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
9503 Inherit_Context (Gen_Body, Inst_Node);
9505 Restore_Private_Views (Pack_Id, False);
9507 if Parent_Installed then
9508 Remove_Parent (In_Body => True);
9510 -- Restore the previous visibility of the parent
9512 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9516 Style_Check := Save_Style_Check;
9518 -- Body not found. Error was emitted already. If there were no previous
9519 -- errors, this may be an instance whose scope is a premature instance.
9520 -- In that case we must insure that the (legal) program does raise
9521 -- program error if executed. We generate a subprogram body for this
9522 -- purpose. See DEC ac30vso.
9524 -- Should not reference proprietary DEC tests in comments ???
9526 elsif Serious_Errors_Detected = 0
9527 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
9529 if Body_Optional then
9532 elsif Ekind (Anon_Id) = E_Procedure then
9534 Make_Subprogram_Body (Loc,
9536 Make_Procedure_Specification (Loc,
9537 Defining_Unit_Name =>
9538 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9539 Parameter_Specifications =>
9541 (Parameter_Specifications (Parent (Anon_Id)))),
9543 Declarations => Empty_List,
9544 Handled_Statement_Sequence =>
9545 Make_Handled_Sequence_Of_Statements (Loc,
9548 Make_Raise_Program_Error (Loc,
9550 PE_Access_Before_Elaboration))));
9554 Make_Raise_Program_Error (Loc,
9555 Reason => PE_Access_Before_Elaboration);
9557 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
9558 Set_Analyzed (Ret_Expr);
9561 Make_Subprogram_Body (Loc,
9563 Make_Function_Specification (Loc,
9564 Defining_Unit_Name =>
9565 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9566 Parameter_Specifications =>
9568 (Parameter_Specifications (Parent (Anon_Id))),
9569 Result_Definition =>
9570 New_Occurrence_Of (Etype (Anon_Id), Loc)),
9572 Declarations => Empty_List,
9573 Handled_Statement_Sequence =>
9574 Make_Handled_Sequence_Of_Statements (Loc,
9577 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
9580 Pack_Body := Make_Package_Body (Loc,
9581 Defining_Unit_Name => New_Copy (Pack_Id),
9582 Declarations => New_List (Act_Body));
9584 Insert_After (Inst_Node, Pack_Body);
9585 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9586 Analyze (Pack_Body);
9589 Expander_Mode_Restore;
9590 end Instantiate_Subprogram_Body;
9592 ----------------------
9593 -- Instantiate_Type --
9594 ----------------------
9596 function Instantiate_Type
9599 Analyzed_Formal : Node_Id;
9600 Actual_Decls : List_Id) return List_Id
9602 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
9603 A_Gen_T : constant Entity_Id :=
9604 Defining_Identifier (Analyzed_Formal);
9605 Ancestor : Entity_Id := Empty;
9606 Def : constant Node_Id := Formal_Type_Definition (Formal);
9608 Decl_Node : Node_Id;
9609 Decl_Nodes : List_Id;
9613 procedure Validate_Array_Type_Instance;
9614 procedure Validate_Access_Subprogram_Instance;
9615 procedure Validate_Access_Type_Instance;
9616 procedure Validate_Derived_Type_Instance;
9617 procedure Validate_Derived_Interface_Type_Instance;
9618 procedure Validate_Discriminated_Formal_Type;
9619 procedure Validate_Interface_Type_Instance;
9620 procedure Validate_Private_Type_Instance;
9621 procedure Validate_Incomplete_Type_Instance;
9622 -- These procedures perform validation tests for the named case.
9623 -- Validate_Discriminated_Formal_Type is shared by formal private
9624 -- types and Ada 2012 formal incomplete types.
9626 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
9627 -- Check that base types are the same and that the subtypes match
9628 -- statically. Used in several of the above.
9630 --------------------
9631 -- Subtypes_Match --
9632 --------------------
9634 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
9635 T : constant Entity_Id := Get_Instance_Of (Gen_T);
9638 return (Base_Type (T) = Base_Type (Act_T)
9639 and then Subtypes_Statically_Match (T, Act_T))
9641 or else (Is_Class_Wide_Type (Gen_T)
9642 and then Is_Class_Wide_Type (Act_T)
9645 (Get_Instance_Of (Root_Type (Gen_T)),
9649 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
9650 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
9651 and then Ekind (Act_T) = Ekind (Gen_T)
9653 Subtypes_Statically_Match
9654 (Designated_Type (Gen_T), Designated_Type (Act_T)));
9657 -----------------------------------------
9658 -- Validate_Access_Subprogram_Instance --
9659 -----------------------------------------
9661 procedure Validate_Access_Subprogram_Instance is
9663 if not Is_Access_Type (Act_T)
9664 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
9667 ("expect access type in instantiation of &", Actual, Gen_T);
9668 Abandon_Instantiation (Actual);
9671 Check_Mode_Conformant
9672 (Designated_Type (Act_T),
9673 Designated_Type (A_Gen_T),
9677 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
9678 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
9680 ("protected access type not allowed for formal &",
9684 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
9686 ("expect protected access type for formal &",
9689 end Validate_Access_Subprogram_Instance;
9691 -----------------------------------
9692 -- Validate_Access_Type_Instance --
9693 -----------------------------------
9695 procedure Validate_Access_Type_Instance is
9696 Desig_Type : constant Entity_Id :=
9697 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
9698 Desig_Act : Entity_Id;
9701 if not Is_Access_Type (Act_T) then
9703 ("expect access type in instantiation of &", Actual, Gen_T);
9704 Abandon_Instantiation (Actual);
9707 if Is_Access_Constant (A_Gen_T) then
9708 if not Is_Access_Constant (Act_T) then
9710 ("actual type must be access-to-constant type", Actual);
9711 Abandon_Instantiation (Actual);
9714 if Is_Access_Constant (Act_T) then
9716 ("actual type must be access-to-variable type", Actual);
9717 Abandon_Instantiation (Actual);
9719 elsif Ekind (A_Gen_T) = E_General_Access_Type
9720 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
9722 Error_Msg_N -- CODEFIX
9723 ("actual must be general access type!", Actual);
9724 Error_Msg_NE -- CODEFIX
9725 ("add ALL to }!", Actual, Act_T);
9726 Abandon_Instantiation (Actual);
9730 -- The designated subtypes, that is to say the subtypes introduced
9731 -- by an access type declaration (and not by a subtype declaration)
9734 Desig_Act := Designated_Type (Base_Type (Act_T));
9736 -- The designated type may have been introduced through a limited_
9737 -- with clause, in which case retrieve the non-limited view. This
9738 -- applies to incomplete types as well as to class-wide types.
9740 if From_With_Type (Desig_Act) then
9741 Desig_Act := Available_View (Desig_Act);
9744 if not Subtypes_Match
9745 (Desig_Type, Desig_Act) then
9747 ("designated type of actual does not match that of formal &",
9749 Abandon_Instantiation (Actual);
9751 elsif Is_Access_Type (Designated_Type (Act_T))
9752 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
9754 Is_Constrained (Designated_Type (Desig_Type))
9757 ("designated type of actual does not match that of formal &",
9759 Abandon_Instantiation (Actual);
9762 -- Ada 2005: null-exclusion indicators of the two types must agree
9764 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
9766 ("non null exclusion of actual and formal & do not match",
9769 end Validate_Access_Type_Instance;
9771 ----------------------------------
9772 -- Validate_Array_Type_Instance --
9773 ----------------------------------
9775 procedure Validate_Array_Type_Instance is
9780 function Formal_Dimensions return Int;
9781 -- Count number of dimensions in array type formal
9783 -----------------------
9784 -- Formal_Dimensions --
9785 -----------------------
9787 function Formal_Dimensions return Int is
9792 if Nkind (Def) = N_Constrained_Array_Definition then
9793 Index := First (Discrete_Subtype_Definitions (Def));
9795 Index := First (Subtype_Marks (Def));
9798 while Present (Index) loop
9804 end Formal_Dimensions;
9806 -- Start of processing for Validate_Array_Type_Instance
9809 if not Is_Array_Type (Act_T) then
9811 ("expect array type in instantiation of &", Actual, Gen_T);
9812 Abandon_Instantiation (Actual);
9814 elsif Nkind (Def) = N_Constrained_Array_Definition then
9815 if not (Is_Constrained (Act_T)) then
9817 ("expect constrained array in instantiation of &",
9819 Abandon_Instantiation (Actual);
9823 if Is_Constrained (Act_T) then
9825 ("expect unconstrained array in instantiation of &",
9827 Abandon_Instantiation (Actual);
9831 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9833 ("dimensions of actual do not match formal &", Actual, Gen_T);
9834 Abandon_Instantiation (Actual);
9837 I1 := First_Index (A_Gen_T);
9838 I2 := First_Index (Act_T);
9839 for J in 1 .. Formal_Dimensions loop
9841 -- If the indexes of the actual were given by a subtype_mark,
9842 -- the index was transformed into a range attribute. Retrieve
9843 -- the original type mark for checking.
9845 if Is_Entity_Name (Original_Node (I2)) then
9846 T2 := Entity (Original_Node (I2));
9851 if not Subtypes_Match
9852 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
9855 ("index types of actual do not match those of formal &",
9857 Abandon_Instantiation (Actual);
9864 -- Check matching subtypes. Note that there are complex visibility
9865 -- issues when the generic is a child unit and some aspect of the
9866 -- generic type is declared in a parent unit of the generic. We do
9867 -- the test to handle this special case only after a direct check
9868 -- for static matching has failed.
9871 (Component_Type (A_Gen_T), Component_Type (Act_T))
9872 or else Subtypes_Match
9873 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
9874 Component_Type (Act_T))
9879 ("component subtype of actual does not match that of formal &",
9881 Abandon_Instantiation (Actual);
9884 if Has_Aliased_Components (A_Gen_T)
9885 and then not Has_Aliased_Components (Act_T)
9888 ("actual must have aliased components to match formal type &",
9891 end Validate_Array_Type_Instance;
9893 -----------------------------------------------
9894 -- Validate_Derived_Interface_Type_Instance --
9895 -----------------------------------------------
9897 procedure Validate_Derived_Interface_Type_Instance is
9898 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9902 -- First apply interface instance checks
9904 Validate_Interface_Type_Instance;
9906 -- Verify that immediate parent interface is an ancestor of
9910 and then not Interface_Present_In_Ancestor (Act_T, Par)
9913 ("interface actual must include progenitor&", Actual, Par);
9916 -- Now verify that the actual includes all other ancestors of
9919 Elmt := First_Elmt (Interfaces (A_Gen_T));
9920 while Present (Elmt) loop
9921 if not Interface_Present_In_Ancestor
9922 (Act_T, Get_Instance_Of (Node (Elmt)))
9925 ("interface actual must include progenitor&",
9926 Actual, Node (Elmt));
9931 end Validate_Derived_Interface_Type_Instance;
9933 ------------------------------------
9934 -- Validate_Derived_Type_Instance --
9935 ------------------------------------
9937 procedure Validate_Derived_Type_Instance is
9938 Actual_Discr : Entity_Id;
9939 Ancestor_Discr : Entity_Id;
9942 -- If the parent type in the generic declaration is itself a previous
9943 -- formal type, then it is local to the generic and absent from the
9944 -- analyzed generic definition. In that case the ancestor is the
9945 -- instance of the formal (which must have been instantiated
9946 -- previously), unless the ancestor is itself a formal derived type.
9947 -- In this latter case (which is the subject of Corrigendum 8652/0038
9948 -- (AI-202) the ancestor of the formals is the ancestor of its
9949 -- parent. Otherwise, the analyzed generic carries the parent type.
9950 -- If the parent type is defined in a previous formal package, then
9951 -- the scope of that formal package is that of the generic type
9952 -- itself, and it has already been mapped into the corresponding type
9953 -- in the actual package.
9955 -- Common case: parent type defined outside of the generic
9957 if Is_Entity_Name (Subtype_Mark (Def))
9958 and then Present (Entity (Subtype_Mark (Def)))
9960 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9962 -- Check whether parent is defined in a previous formal package
9965 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9968 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9970 -- The type may be a local derivation, or a type extension of a
9971 -- previous formal, or of a formal of a parent package.
9973 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9975 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9977 -- Check whether the parent is another derived formal type in the
9978 -- same generic unit.
9980 if Etype (A_Gen_T) /= A_Gen_T
9981 and then Is_Generic_Type (Etype (A_Gen_T))
9982 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9983 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9985 -- Locate ancestor of parent from the subtype declaration
9986 -- created for the actual.
9992 Decl := First (Actual_Decls);
9993 while Present (Decl) loop
9994 if Nkind (Decl) = N_Subtype_Declaration
9995 and then Chars (Defining_Identifier (Decl)) =
9996 Chars (Etype (A_Gen_T))
9998 Ancestor := Generic_Parent_Type (Decl);
10006 pragma Assert (Present (Ancestor));
10010 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
10014 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
10017 -- If the formal derived type has pragma Preelaborable_Initialization
10018 -- then the actual type must have preelaborable initialization.
10020 if Known_To_Have_Preelab_Init (A_Gen_T)
10021 and then not Has_Preelaborable_Initialization (Act_T)
10024 ("actual for & must have preelaborable initialization",
10028 -- Ada 2005 (AI-251)
10030 if Ada_Version >= Ada_2005
10031 and then Is_Interface (Ancestor)
10033 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
10035 ("(Ada 2005) expected type implementing & in instantiation",
10039 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
10041 ("expect type derived from & in instantiation",
10042 Actual, First_Subtype (Ancestor));
10043 Abandon_Instantiation (Actual);
10046 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10047 -- that the formal type declaration has been rewritten as a private
10050 if Ada_Version >= Ada_2005
10051 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
10052 and then Synchronized_Present (Parent (A_Gen_T))
10054 -- The actual must be a synchronized tagged type
10056 if not Is_Tagged_Type (Act_T) then
10058 ("actual of synchronized type must be tagged", Actual);
10059 Abandon_Instantiation (Actual);
10061 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
10062 and then Nkind (Type_Definition (Parent (Act_T))) =
10063 N_Derived_Type_Definition
10064 and then not Synchronized_Present (Type_Definition
10068 ("actual of synchronized type must be synchronized", Actual);
10069 Abandon_Instantiation (Actual);
10073 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
10074 -- removes the second instance of the phrase "or allow pass by copy".
10076 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
10078 ("cannot have atomic actual type for non-atomic formal type",
10081 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
10083 ("cannot have volatile actual type for non-volatile formal type",
10087 -- It should not be necessary to check for unknown discriminants on
10088 -- Formal, but for some reason Has_Unknown_Discriminants is false for
10089 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
10090 -- needs fixing. ???
10092 if not Is_Indefinite_Subtype (A_Gen_T)
10093 and then not Unknown_Discriminants_Present (Formal)
10094 and then Is_Indefinite_Subtype (Act_T)
10097 ("actual subtype must be constrained", Actual);
10098 Abandon_Instantiation (Actual);
10101 if not Unknown_Discriminants_Present (Formal) then
10102 if Is_Constrained (Ancestor) then
10103 if not Is_Constrained (Act_T) then
10105 ("actual subtype must be constrained", Actual);
10106 Abandon_Instantiation (Actual);
10109 -- Ancestor is unconstrained, Check if generic formal and actual
10110 -- agree on constrainedness. The check only applies to array types
10111 -- and discriminated types.
10113 elsif Is_Constrained (Act_T) then
10114 if Ekind (Ancestor) = E_Access_Type
10116 (not Is_Constrained (A_Gen_T)
10117 and then Is_Composite_Type (A_Gen_T))
10120 ("actual subtype must be unconstrained", Actual);
10121 Abandon_Instantiation (Actual);
10124 -- A class-wide type is only allowed if the formal has unknown
10127 elsif Is_Class_Wide_Type (Act_T)
10128 and then not Has_Unknown_Discriminants (Ancestor)
10131 ("actual for & cannot be a class-wide type", Actual, Gen_T);
10132 Abandon_Instantiation (Actual);
10134 -- Otherwise, the formal and actual shall have the same number
10135 -- of discriminants and each discriminant of the actual must
10136 -- correspond to a discriminant of the formal.
10138 elsif Has_Discriminants (Act_T)
10139 and then not Has_Unknown_Discriminants (Act_T)
10140 and then Has_Discriminants (Ancestor)
10142 Actual_Discr := First_Discriminant (Act_T);
10143 Ancestor_Discr := First_Discriminant (Ancestor);
10144 while Present (Actual_Discr)
10145 and then Present (Ancestor_Discr)
10147 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
10148 No (Corresponding_Discriminant (Actual_Discr))
10151 ("discriminant & does not correspond " &
10152 "to ancestor discriminant", Actual, Actual_Discr);
10153 Abandon_Instantiation (Actual);
10156 Next_Discriminant (Actual_Discr);
10157 Next_Discriminant (Ancestor_Discr);
10160 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
10162 ("actual for & must have same number of discriminants",
10164 Abandon_Instantiation (Actual);
10167 -- This case should be caught by the earlier check for
10168 -- constrainedness, but the check here is added for completeness.
10170 elsif Has_Discriminants (Act_T)
10171 and then not Has_Unknown_Discriminants (Act_T)
10174 ("actual for & must not have discriminants", Actual, Gen_T);
10175 Abandon_Instantiation (Actual);
10177 elsif Has_Discriminants (Ancestor) then
10179 ("actual for & must have known discriminants", Actual, Gen_T);
10180 Abandon_Instantiation (Actual);
10183 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
10185 ("constraint on actual is incompatible with formal", Actual);
10186 Abandon_Instantiation (Actual);
10190 -- If the formal and actual types are abstract, check that there
10191 -- are no abstract primitives of the actual type that correspond to
10192 -- nonabstract primitives of the formal type (second sentence of
10195 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
10196 Check_Abstract_Primitives : declare
10197 Gen_Prims : constant Elist_Id :=
10198 Primitive_Operations (A_Gen_T);
10199 Gen_Elmt : Elmt_Id;
10200 Gen_Subp : Entity_Id;
10201 Anc_Subp : Entity_Id;
10202 Anc_Formal : Entity_Id;
10203 Anc_F_Type : Entity_Id;
10205 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
10206 Act_Elmt : Elmt_Id;
10207 Act_Subp : Entity_Id;
10208 Act_Formal : Entity_Id;
10209 Act_F_Type : Entity_Id;
10211 Subprograms_Correspond : Boolean;
10213 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
10214 -- Returns true if T2 is derived directly or indirectly from
10215 -- T1, including derivations from interfaces. T1 and T2 are
10216 -- required to be specific tagged base types.
10218 ------------------------
10219 -- Is_Tagged_Ancestor --
10220 ------------------------
10222 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
10224 Intfc_Elmt : Elmt_Id;
10227 -- The predicate is satisfied if the types are the same
10232 -- If we've reached the top of the derivation chain then
10233 -- we know that T1 is not an ancestor of T2.
10235 elsif Etype (T2) = T2 then
10238 -- Proceed to check T2's immediate parent
10240 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
10243 -- Finally, check to see if T1 is an ancestor of any of T2's
10247 Intfc_Elmt := First_Elmt (Interfaces (T2));
10248 while Present (Intfc_Elmt) loop
10249 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
10253 Next_Elmt (Intfc_Elmt);
10258 end Is_Tagged_Ancestor;
10260 -- Start of processing for Check_Abstract_Primitives
10263 -- Loop over all of the formal derived type's primitives
10265 Gen_Elmt := First_Elmt (Gen_Prims);
10266 while Present (Gen_Elmt) loop
10267 Gen_Subp := Node (Gen_Elmt);
10269 -- If the primitive of the formal is not abstract, then
10270 -- determine whether there is a corresponding primitive of
10271 -- the actual type that's abstract.
10273 if not Is_Abstract_Subprogram (Gen_Subp) then
10274 Act_Elmt := First_Elmt (Act_Prims);
10275 while Present (Act_Elmt) loop
10276 Act_Subp := Node (Act_Elmt);
10278 -- If we find an abstract primitive of the actual,
10279 -- then we need to test whether it corresponds to the
10280 -- subprogram from which the generic formal primitive
10283 if Is_Abstract_Subprogram (Act_Subp) then
10284 Anc_Subp := Alias (Gen_Subp);
10286 -- Test whether we have a corresponding primitive
10287 -- by comparing names, kinds, formal types, and
10290 if Chars (Anc_Subp) = Chars (Act_Subp)
10291 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
10293 Anc_Formal := First_Formal (Anc_Subp);
10294 Act_Formal := First_Formal (Act_Subp);
10295 while Present (Anc_Formal)
10296 and then Present (Act_Formal)
10298 Anc_F_Type := Etype (Anc_Formal);
10299 Act_F_Type := Etype (Act_Formal);
10301 if Ekind (Anc_F_Type)
10302 = E_Anonymous_Access_Type
10304 Anc_F_Type := Designated_Type (Anc_F_Type);
10306 if Ekind (Act_F_Type)
10307 = E_Anonymous_Access_Type
10310 Designated_Type (Act_F_Type);
10316 Ekind (Act_F_Type) = E_Anonymous_Access_Type
10321 Anc_F_Type := Base_Type (Anc_F_Type);
10322 Act_F_Type := Base_Type (Act_F_Type);
10324 -- If the formal is controlling, then the
10325 -- the type of the actual primitive's formal
10326 -- must be derived directly or indirectly
10327 -- from the type of the ancestor primitive's
10330 if Is_Controlling_Formal (Anc_Formal) then
10331 if not Is_Tagged_Ancestor
10332 (Anc_F_Type, Act_F_Type)
10337 -- Otherwise the types of the formals must
10340 elsif Anc_F_Type /= Act_F_Type then
10344 Next_Entity (Anc_Formal);
10345 Next_Entity (Act_Formal);
10348 -- If we traversed through all of the formals
10349 -- then so far the subprograms correspond, so
10350 -- now check that any result types correspond.
10352 if No (Anc_Formal) and then No (Act_Formal) then
10353 Subprograms_Correspond := True;
10355 if Ekind (Act_Subp) = E_Function then
10356 Anc_F_Type := Etype (Anc_Subp);
10357 Act_F_Type := Etype (Act_Subp);
10359 if Ekind (Anc_F_Type)
10360 = E_Anonymous_Access_Type
10363 Designated_Type (Anc_F_Type);
10365 if Ekind (Act_F_Type)
10366 = E_Anonymous_Access_Type
10369 Designated_Type (Act_F_Type);
10371 Subprograms_Correspond := False;
10376 = E_Anonymous_Access_Type
10378 Subprograms_Correspond := False;
10381 Anc_F_Type := Base_Type (Anc_F_Type);
10382 Act_F_Type := Base_Type (Act_F_Type);
10384 -- Now either the result types must be
10385 -- the same or, if the result type is
10386 -- controlling, the result type of the
10387 -- actual primitive must descend from the
10388 -- result type of the ancestor primitive.
10390 if Subprograms_Correspond
10391 and then Anc_F_Type /= Act_F_Type
10393 Has_Controlling_Result (Anc_Subp)
10395 not Is_Tagged_Ancestor
10396 (Anc_F_Type, Act_F_Type)
10398 Subprograms_Correspond := False;
10402 -- Found a matching subprogram belonging to
10403 -- formal ancestor type, so actual subprogram
10404 -- corresponds and this violates 3.9.3(9).
10406 if Subprograms_Correspond then
10408 ("abstract subprogram & overrides " &
10409 "nonabstract subprogram of ancestor",
10417 Next_Elmt (Act_Elmt);
10421 Next_Elmt (Gen_Elmt);
10423 end Check_Abstract_Primitives;
10426 -- Verify that limitedness matches. If parent is a limited
10427 -- interface then the generic formal is not unless declared
10428 -- explicitly so. If not declared limited, the actual cannot be
10429 -- limited (see AI05-0087).
10431 -- Even though this AI is a binding interpretation, we enable the
10432 -- check only in Ada 2012 mode, because this improper construct
10433 -- shows up in user code and in existing B-tests.
10435 if Is_Limited_Type (Act_T)
10436 and then not Is_Limited_Type (A_Gen_T)
10437 and then Ada_Version >= Ada_2012
10439 if In_Instance then
10443 ("actual for non-limited & cannot be a limited type", Actual,
10445 Explain_Limited_Type (Act_T, Actual);
10446 Abandon_Instantiation (Actual);
10449 end Validate_Derived_Type_Instance;
10451 ----------------------------------------
10452 -- Validate_Discriminated_Formal_Type --
10453 ----------------------------------------
10455 procedure Validate_Discriminated_Formal_Type is
10456 Formal_Discr : Entity_Id;
10457 Actual_Discr : Entity_Id;
10458 Formal_Subt : Entity_Id;
10461 if Has_Discriminants (A_Gen_T) then
10462 if not Has_Discriminants (Act_T) then
10464 ("actual for & must have discriminants", Actual, Gen_T);
10465 Abandon_Instantiation (Actual);
10467 elsif Is_Constrained (Act_T) then
10469 ("actual for & must be unconstrained", Actual, Gen_T);
10470 Abandon_Instantiation (Actual);
10473 Formal_Discr := First_Discriminant (A_Gen_T);
10474 Actual_Discr := First_Discriminant (Act_T);
10475 while Formal_Discr /= Empty loop
10476 if Actual_Discr = Empty then
10478 ("discriminants on actual do not match formal",
10480 Abandon_Instantiation (Actual);
10483 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
10485 -- Access discriminants match if designated types do
10487 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
10488 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
10489 E_Anonymous_Access_Type
10492 (Designated_Type (Base_Type (Formal_Subt))) =
10493 Designated_Type (Base_Type (Etype (Actual_Discr)))
10497 elsif Base_Type (Formal_Subt) /=
10498 Base_Type (Etype (Actual_Discr))
10501 ("types of actual discriminants must match formal",
10503 Abandon_Instantiation (Actual);
10505 elsif not Subtypes_Statically_Match
10506 (Formal_Subt, Etype (Actual_Discr))
10507 and then Ada_Version >= Ada_95
10510 ("subtypes of actual discriminants must match formal",
10512 Abandon_Instantiation (Actual);
10515 Next_Discriminant (Formal_Discr);
10516 Next_Discriminant (Actual_Discr);
10519 if Actual_Discr /= Empty then
10521 ("discriminants on actual do not match formal",
10523 Abandon_Instantiation (Actual);
10527 end Validate_Discriminated_Formal_Type;
10529 ---------------------------------------
10530 -- Validate_Incomplete_Type_Instance --
10531 ---------------------------------------
10533 procedure Validate_Incomplete_Type_Instance is
10535 if not Is_Tagged_Type (Act_T)
10536 and then Is_Tagged_Type (A_Gen_T)
10539 ("actual for & must be a tagged type", Actual, Gen_T);
10542 Validate_Discriminated_Formal_Type;
10543 end Validate_Incomplete_Type_Instance;
10545 --------------------------------------
10546 -- Validate_Interface_Type_Instance --
10547 --------------------------------------
10549 procedure Validate_Interface_Type_Instance is
10551 if not Is_Interface (Act_T) then
10553 ("actual for formal interface type must be an interface",
10556 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
10558 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
10560 Is_Protected_Interface (A_Gen_T) /=
10561 Is_Protected_Interface (Act_T)
10563 Is_Synchronized_Interface (A_Gen_T) /=
10564 Is_Synchronized_Interface (Act_T)
10567 ("actual for interface& does not match (RM 12.5.5(4))",
10570 end Validate_Interface_Type_Instance;
10572 ------------------------------------
10573 -- Validate_Private_Type_Instance --
10574 ------------------------------------
10576 procedure Validate_Private_Type_Instance is
10578 if Is_Limited_Type (Act_T)
10579 and then not Is_Limited_Type (A_Gen_T)
10581 if In_Instance then
10585 ("actual for non-limited & cannot be a limited type", Actual,
10587 Explain_Limited_Type (Act_T, Actual);
10588 Abandon_Instantiation (Actual);
10591 elsif Known_To_Have_Preelab_Init (A_Gen_T)
10592 and then not Has_Preelaborable_Initialization (Act_T)
10595 ("actual for & must have preelaborable initialization", Actual,
10598 elsif Is_Indefinite_Subtype (Act_T)
10599 and then not Is_Indefinite_Subtype (A_Gen_T)
10600 and then Ada_Version >= Ada_95
10603 ("actual for & must be a definite subtype", Actual, Gen_T);
10605 elsif not Is_Tagged_Type (Act_T)
10606 and then Is_Tagged_Type (A_Gen_T)
10609 ("actual for & must be a tagged type", Actual, Gen_T);
10612 Validate_Discriminated_Formal_Type;
10614 end Validate_Private_Type_Instance;
10616 -- Start of processing for Instantiate_Type
10619 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
10620 Error_Msg_N ("duplicate instantiation of generic type", Actual);
10621 return New_List (Error);
10623 elsif not Is_Entity_Name (Actual)
10624 or else not Is_Type (Entity (Actual))
10627 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
10628 Abandon_Instantiation (Actual);
10631 Act_T := Entity (Actual);
10633 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
10634 -- as a generic actual parameter if the corresponding formal type
10635 -- does not have a known_discriminant_part, or is a formal derived
10636 -- type that is an Unchecked_Union type.
10638 if Is_Unchecked_Union (Base_Type (Act_T)) then
10639 if not Has_Discriminants (A_Gen_T)
10641 (Is_Derived_Type (A_Gen_T)
10643 Is_Unchecked_Union (A_Gen_T))
10647 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
10648 " discriminated formal type", Act_T);
10653 -- Deal with fixed/floating restrictions
10655 if Is_Floating_Point_Type (Act_T) then
10656 Check_Restriction (No_Floating_Point, Actual);
10657 elsif Is_Fixed_Point_Type (Act_T) then
10658 Check_Restriction (No_Fixed_Point, Actual);
10661 -- Deal with error of using incomplete type as generic actual.
10662 -- This includes limited views of a type, even if the non-limited
10663 -- view may be available.
10665 if Ekind (Act_T) = E_Incomplete_Type
10666 or else (Is_Class_Wide_Type (Act_T)
10668 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
10670 -- If the formal is an incomplete type, the actual can be
10671 -- incomplete as well.
10673 if Ekind (A_Gen_T) = E_Incomplete_Type then
10676 elsif Is_Class_Wide_Type (Act_T)
10677 or else No (Full_View (Act_T))
10679 Error_Msg_N ("premature use of incomplete type", Actual);
10680 Abandon_Instantiation (Actual);
10682 Act_T := Full_View (Act_T);
10683 Set_Entity (Actual, Act_T);
10685 if Has_Private_Component (Act_T) then
10687 ("premature use of type with private component", Actual);
10691 -- Deal with error of premature use of private type as generic actual
10693 elsif Is_Private_Type (Act_T)
10694 and then Is_Private_Type (Base_Type (Act_T))
10695 and then not Is_Generic_Type (Act_T)
10696 and then not Is_Derived_Type (Act_T)
10697 and then No (Full_View (Root_Type (Act_T)))
10699 -- If the formal is an incomplete type, the actual can be
10700 -- private or incomplete as well.
10702 if Ekind (A_Gen_T) = E_Incomplete_Type then
10705 Error_Msg_N ("premature use of private type", Actual);
10708 elsif Has_Private_Component (Act_T) then
10710 ("premature use of type with private component", Actual);
10713 Set_Instance_Of (A_Gen_T, Act_T);
10715 -- If the type is generic, the class-wide type may also be used
10717 if Is_Tagged_Type (A_Gen_T)
10718 and then Is_Tagged_Type (Act_T)
10719 and then not Is_Class_Wide_Type (A_Gen_T)
10721 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
10722 Class_Wide_Type (Act_T));
10725 if not Is_Abstract_Type (A_Gen_T)
10726 and then Is_Abstract_Type (Act_T)
10729 ("actual of non-abstract formal cannot be abstract", Actual);
10732 -- A generic scalar type is a first subtype for which we generate
10733 -- an anonymous base type. Indicate that the instance of this base
10734 -- is the base type of the actual.
10736 if Is_Scalar_Type (A_Gen_T) then
10737 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
10741 if Error_Posted (Act_T) then
10744 case Nkind (Def) is
10745 when N_Formal_Private_Type_Definition =>
10746 Validate_Private_Type_Instance;
10748 when N_Formal_Incomplete_Type_Definition =>
10749 Validate_Incomplete_Type_Instance;
10751 when N_Formal_Derived_Type_Definition =>
10752 Validate_Derived_Type_Instance;
10754 when N_Formal_Discrete_Type_Definition =>
10755 if not Is_Discrete_Type (Act_T) then
10757 ("expect discrete type in instantiation of&",
10759 Abandon_Instantiation (Actual);
10762 when N_Formal_Signed_Integer_Type_Definition =>
10763 if not Is_Signed_Integer_Type (Act_T) then
10765 ("expect signed integer type in instantiation of&",
10767 Abandon_Instantiation (Actual);
10770 when N_Formal_Modular_Type_Definition =>
10771 if not Is_Modular_Integer_Type (Act_T) then
10773 ("expect modular type in instantiation of &",
10775 Abandon_Instantiation (Actual);
10778 when N_Formal_Floating_Point_Definition =>
10779 if not Is_Floating_Point_Type (Act_T) then
10781 ("expect float type in instantiation of &", Actual, Gen_T);
10782 Abandon_Instantiation (Actual);
10785 when N_Formal_Ordinary_Fixed_Point_Definition =>
10786 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
10788 ("expect ordinary fixed point type in instantiation of &",
10790 Abandon_Instantiation (Actual);
10793 when N_Formal_Decimal_Fixed_Point_Definition =>
10794 if not Is_Decimal_Fixed_Point_Type (Act_T) then
10796 ("expect decimal type in instantiation of &",
10798 Abandon_Instantiation (Actual);
10801 when N_Array_Type_Definition =>
10802 Validate_Array_Type_Instance;
10804 when N_Access_To_Object_Definition =>
10805 Validate_Access_Type_Instance;
10807 when N_Access_Function_Definition |
10808 N_Access_Procedure_Definition =>
10809 Validate_Access_Subprogram_Instance;
10811 when N_Record_Definition =>
10812 Validate_Interface_Type_Instance;
10814 when N_Derived_Type_Definition =>
10815 Validate_Derived_Interface_Type_Instance;
10818 raise Program_Error;
10823 Subt := New_Copy (Gen_T);
10825 -- Use adjusted sloc of subtype name as the location for other nodes in
10826 -- the subtype declaration.
10828 Loc := Sloc (Subt);
10831 Make_Subtype_Declaration (Loc,
10832 Defining_Identifier => Subt,
10833 Subtype_Indication => New_Reference_To (Act_T, Loc));
10835 if Is_Private_Type (Act_T) then
10836 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10838 elsif Is_Access_Type (Act_T)
10839 and then Is_Private_Type (Designated_Type (Act_T))
10841 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10844 Decl_Nodes := New_List (Decl_Node);
10846 -- Flag actual derived types so their elaboration produces the
10847 -- appropriate renamings for the primitive operations of the ancestor.
10848 -- Flag actual for formal private types as well, to determine whether
10849 -- operations in the private part may override inherited operations.
10850 -- If the formal has an interface list, the ancestor is not the
10851 -- parent, but the analyzed formal that includes the interface
10852 -- operations of all its progenitors.
10854 -- Same treatment for formal private types, so we can check whether the
10855 -- type is tagged limited when validating derivations in the private
10856 -- part. (See AI05-096).
10858 if Nkind (Def) = N_Formal_Derived_Type_Definition then
10859 if Present (Interface_List (Def)) then
10860 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10862 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10865 elsif Nkind_In (Def,
10866 N_Formal_Private_Type_Definition,
10867 N_Formal_Incomplete_Type_Definition)
10869 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10872 -- If the actual is a synchronized type that implements an interface,
10873 -- the primitive operations are attached to the corresponding record,
10874 -- and we have to treat it as an additional generic actual, so that its
10875 -- primitive operations become visible in the instance. The task or
10876 -- protected type itself does not carry primitive operations.
10878 if Is_Concurrent_Type (Act_T)
10879 and then Is_Tagged_Type (Act_T)
10880 and then Present (Corresponding_Record_Type (Act_T))
10881 and then Present (Ancestor)
10882 and then Is_Interface (Ancestor)
10885 Corr_Rec : constant Entity_Id :=
10886 Corresponding_Record_Type (Act_T);
10887 New_Corr : Entity_Id;
10888 Corr_Decl : Node_Id;
10891 New_Corr := Make_Temporary (Loc, 'S');
10893 Make_Subtype_Declaration (Loc,
10894 Defining_Identifier => New_Corr,
10895 Subtype_Indication =>
10896 New_Reference_To (Corr_Rec, Loc));
10897 Append_To (Decl_Nodes, Corr_Decl);
10899 if Ekind (Act_T) = E_Task_Type then
10900 Set_Ekind (Subt, E_Task_Subtype);
10902 Set_Ekind (Subt, E_Protected_Subtype);
10905 Set_Corresponding_Record_Type (Subt, Corr_Rec);
10906 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
10907 Set_Generic_Parent_Type (Decl_Node, Empty);
10912 end Instantiate_Type;
10914 ---------------------
10915 -- Is_In_Main_Unit --
10916 ---------------------
10918 function Is_In_Main_Unit (N : Node_Id) return Boolean is
10919 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
10920 Current_Unit : Node_Id;
10923 if Unum = Main_Unit then
10926 -- If the current unit is a subunit then it is either the main unit or
10927 -- is being compiled as part of the main unit.
10929 elsif Nkind (N) = N_Compilation_Unit then
10930 return Nkind (Unit (N)) = N_Subunit;
10933 Current_Unit := Parent (N);
10934 while Present (Current_Unit)
10935 and then Nkind (Current_Unit) /= N_Compilation_Unit
10937 Current_Unit := Parent (Current_Unit);
10940 -- The instantiation node is in the main unit, or else the current node
10941 -- (perhaps as the result of nested instantiations) is in the main unit,
10942 -- or in the declaration of the main unit, which in this last case must
10945 return Unum = Main_Unit
10946 or else Current_Unit = Cunit (Main_Unit)
10947 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
10948 or else (Present (Library_Unit (Current_Unit))
10949 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
10950 end Is_In_Main_Unit;
10952 ----------------------------
10953 -- Load_Parent_Of_Generic --
10954 ----------------------------
10956 procedure Load_Parent_Of_Generic
10959 Body_Optional : Boolean := False)
10961 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
10962 Save_Style_Check : constant Boolean := Style_Check;
10963 True_Parent : Node_Id;
10964 Inst_Node : Node_Id;
10966 Previous_Instances : constant Elist_Id := New_Elmt_List;
10968 procedure Collect_Previous_Instances (Decls : List_Id);
10969 -- Collect all instantiations in the given list of declarations, that
10970 -- precede the generic that we need to load. If the bodies of these
10971 -- instantiations are available, we must analyze them, to ensure that
10972 -- the public symbols generated are the same when the unit is compiled
10973 -- to generate code, and when it is compiled in the context of a unit
10974 -- that needs a particular nested instance. This process is applied to
10975 -- both package and subprogram instances.
10977 --------------------------------
10978 -- Collect_Previous_Instances --
10979 --------------------------------
10981 procedure Collect_Previous_Instances (Decls : List_Id) is
10985 Decl := First (Decls);
10986 while Present (Decl) loop
10987 if Sloc (Decl) >= Sloc (Inst_Node) then
10990 -- If Decl is an instantiation, then record it as requiring
10991 -- instantiation of the corresponding body, except if it is an
10992 -- abbreviated instantiation generated internally for conformance
10993 -- checking purposes only for the case of a formal package
10994 -- declared without a box (see Instantiate_Formal_Package). Such
10995 -- an instantiation does not generate any code (the actual code
10996 -- comes from actual) and thus does not need to be analyzed here.
10997 -- If the instantiation appears with a generic package body it is
10998 -- not analyzed here either.
11000 elsif Nkind (Decl) = N_Package_Instantiation
11001 and then not Is_Internal (Defining_Entity (Decl))
11003 Append_Elmt (Decl, Previous_Instances);
11005 -- For a subprogram instantiation, omit instantiations intrinsic
11006 -- operations (Unchecked_Conversions, etc.) that have no bodies.
11008 elsif Nkind_In (Decl, N_Function_Instantiation,
11009 N_Procedure_Instantiation)
11010 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
11012 Append_Elmt (Decl, Previous_Instances);
11014 elsif Nkind (Decl) = N_Package_Declaration then
11015 Collect_Previous_Instances
11016 (Visible_Declarations (Specification (Decl)));
11017 Collect_Previous_Instances
11018 (Private_Declarations (Specification (Decl)));
11020 -- Previous non-generic bodies may contain instances as well
11022 elsif Nkind (Decl) = N_Package_Body
11023 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
11025 Collect_Previous_Instances (Declarations (Decl));
11027 elsif Nkind (Decl) = N_Subprogram_Body
11028 and then not Acts_As_Spec (Decl)
11029 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
11031 Collect_Previous_Instances (Declarations (Decl));
11036 end Collect_Previous_Instances;
11038 -- Start of processing for Load_Parent_Of_Generic
11041 if not In_Same_Source_Unit (N, Spec)
11042 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
11043 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
11044 and then not Is_In_Main_Unit (Spec))
11046 -- Find body of parent of spec, and analyze it. A special case arises
11047 -- when the parent is an instantiation, that is to say when we are
11048 -- currently instantiating a nested generic. In that case, there is
11049 -- no separate file for the body of the enclosing instance. Instead,
11050 -- the enclosing body must be instantiated as if it were a pending
11051 -- instantiation, in order to produce the body for the nested generic
11052 -- we require now. Note that in that case the generic may be defined
11053 -- in a package body, the instance defined in the same package body,
11054 -- and the original enclosing body may not be in the main unit.
11056 Inst_Node := Empty;
11058 True_Parent := Parent (Spec);
11059 while Present (True_Parent)
11060 and then Nkind (True_Parent) /= N_Compilation_Unit
11062 if Nkind (True_Parent) = N_Package_Declaration
11064 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
11066 -- Parent is a compilation unit that is an instantiation.
11067 -- Instantiation node has been replaced with package decl.
11069 Inst_Node := Original_Node (True_Parent);
11072 elsif Nkind (True_Parent) = N_Package_Declaration
11073 and then Present (Generic_Parent (Specification (True_Parent)))
11074 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11076 -- Parent is an instantiation within another specification.
11077 -- Declaration for instance has been inserted before original
11078 -- instantiation node. A direct link would be preferable?
11080 Inst_Node := Next (True_Parent);
11081 while Present (Inst_Node)
11082 and then Nkind (Inst_Node) /= N_Package_Instantiation
11087 -- If the instance appears within a generic, and the generic
11088 -- unit is defined within a formal package of the enclosing
11089 -- generic, there is no generic body available, and none
11090 -- needed. A more precise test should be used ???
11092 if No (Inst_Node) then
11099 True_Parent := Parent (True_Parent);
11103 -- Case where we are currently instantiating a nested generic
11105 if Present (Inst_Node) then
11106 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
11108 -- Instantiation node and declaration of instantiated package
11109 -- were exchanged when only the declaration was needed.
11110 -- Restore instantiation node before proceeding with body.
11112 Set_Unit (Parent (True_Parent), Inst_Node);
11115 -- Now complete instantiation of enclosing body, if it appears in
11116 -- some other unit. If it appears in the current unit, the body
11117 -- will have been instantiated already.
11119 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
11121 -- We need to determine the expander mode to instantiate the
11122 -- enclosing body. Because the generic body we need may use
11123 -- global entities declared in the enclosing package (including
11124 -- aggregates) it is in general necessary to compile this body
11125 -- with expansion enabled, except if we are within a generic
11126 -- package, in which case the usual generic rule applies.
11129 Exp_Status : Boolean := True;
11133 -- Loop through scopes looking for generic package
11135 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
11136 while Present (Scop)
11137 and then Scop /= Standard_Standard
11139 if Ekind (Scop) = E_Generic_Package then
11140 Exp_Status := False;
11144 Scop := Scope (Scop);
11147 -- Collect previous instantiations in the unit that contains
11148 -- the desired generic.
11150 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11151 and then not Body_Optional
11155 Info : Pending_Body_Info;
11159 Par := Parent (Inst_Node);
11160 while Present (Par) loop
11161 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
11162 Par := Parent (Par);
11165 pragma Assert (Present (Par));
11167 if Nkind (Par) = N_Package_Body then
11168 Collect_Previous_Instances (Declarations (Par));
11170 elsif Nkind (Par) = N_Package_Declaration then
11171 Collect_Previous_Instances
11172 (Visible_Declarations (Specification (Par)));
11173 Collect_Previous_Instances
11174 (Private_Declarations (Specification (Par)));
11177 -- Enclosing unit is a subprogram body. In this
11178 -- case all instance bodies are processed in order
11179 -- and there is no need to collect them separately.
11184 Decl := First_Elmt (Previous_Instances);
11185 while Present (Decl) loop
11187 (Inst_Node => Node (Decl),
11189 Instance_Spec (Node (Decl)),
11190 Expander_Status => Exp_Status,
11191 Current_Sem_Unit =>
11192 Get_Code_Unit (Sloc (Node (Decl))),
11193 Scope_Suppress => Scope_Suppress,
11194 Local_Suppress_Stack_Top =>
11195 Local_Suppress_Stack_Top,
11196 Version => Ada_Version);
11198 -- Package instance
11201 Nkind (Node (Decl)) = N_Package_Instantiation
11203 Instantiate_Package_Body
11204 (Info, Body_Optional => True);
11206 -- Subprogram instance
11209 -- The instance_spec is the wrapper package,
11210 -- and the subprogram declaration is the last
11211 -- declaration in the wrapper.
11215 (Visible_Declarations
11216 (Specification (Info.Act_Decl)));
11218 Instantiate_Subprogram_Body
11219 (Info, Body_Optional => True);
11227 Instantiate_Package_Body
11229 ((Inst_Node => Inst_Node,
11230 Act_Decl => True_Parent,
11231 Expander_Status => Exp_Status,
11232 Current_Sem_Unit =>
11233 Get_Code_Unit (Sloc (Inst_Node)),
11234 Scope_Suppress => Scope_Suppress,
11235 Local_Suppress_Stack_Top =>
11236 Local_Suppress_Stack_Top,
11237 Version => Ada_Version)),
11238 Body_Optional => Body_Optional);
11242 -- Case where we are not instantiating a nested generic
11245 Opt.Style_Check := False;
11246 Expander_Mode_Save_And_Set (True);
11247 Load_Needed_Body (Comp_Unit, OK);
11248 Opt.Style_Check := Save_Style_Check;
11249 Expander_Mode_Restore;
11252 and then Unit_Requires_Body (Defining_Entity (Spec))
11253 and then not Body_Optional
11256 Bname : constant Unit_Name_Type :=
11257 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
11260 -- In CodePeer mode, the missing body may make the analysis
11261 -- incomplete, but we do not treat it as fatal.
11263 if CodePeer_Mode then
11267 Error_Msg_Unit_1 := Bname;
11268 Error_Msg_N ("this instantiation requires$!", N);
11269 Error_Msg_File_1 :=
11270 Get_File_Name (Bname, Subunit => False);
11271 Error_Msg_N ("\but file{ was not found!", N);
11272 raise Unrecoverable_Error;
11279 -- If loading parent of the generic caused an instantiation circularity,
11280 -- we abandon compilation at this point, because otherwise in some cases
11281 -- we get into trouble with infinite recursions after this point.
11283 if Circularity_Detected then
11284 raise Unrecoverable_Error;
11286 end Load_Parent_Of_Generic;
11288 ---------------------------------
11289 -- Map_Formal_Package_Entities --
11290 ---------------------------------
11292 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
11297 Set_Instance_Of (Form, Act);
11299 -- Traverse formal and actual package to map the corresponding entities.
11300 -- We skip over internal entities that may be generated during semantic
11301 -- analysis, and find the matching entities by name, given that they
11302 -- must appear in the same order.
11304 E1 := First_Entity (Form);
11305 E2 := First_Entity (Act);
11306 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
11307 -- Could this test be a single condition???
11308 -- Seems like it could, and isn't FPE (Form) a constant anyway???
11310 if not Is_Internal (E1)
11311 and then Present (Parent (E1))
11312 and then not Is_Class_Wide_Type (E1)
11313 and then not Is_Internal_Name (Chars (E1))
11315 while Present (E2) and then Chars (E2) /= Chars (E1) loop
11322 Set_Instance_Of (E1, E2);
11324 if Is_Type (E1) and then Is_Tagged_Type (E2) then
11325 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
11328 if Is_Constrained (E1) then
11329 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
11332 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
11333 Map_Formal_Package_Entities (E1, E2);
11340 end Map_Formal_Package_Entities;
11342 -----------------------
11343 -- Move_Freeze_Nodes --
11344 -----------------------
11346 procedure Move_Freeze_Nodes
11347 (Out_Of : Entity_Id;
11352 Next_Decl : Node_Id;
11353 Next_Node : Node_Id := After;
11356 function Is_Outer_Type (T : Entity_Id) return Boolean;
11357 -- Check whether entity is declared in a scope external to that of the
11360 -------------------
11361 -- Is_Outer_Type --
11362 -------------------
11364 function Is_Outer_Type (T : Entity_Id) return Boolean is
11365 Scop : Entity_Id := Scope (T);
11368 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
11372 while Scop /= Standard_Standard loop
11373 if Scop = Out_Of then
11376 Scop := Scope (Scop);
11384 -- Start of processing for Move_Freeze_Nodes
11391 -- First remove the freeze nodes that may appear before all other
11395 while Present (Decl)
11396 and then Nkind (Decl) = N_Freeze_Entity
11397 and then Is_Outer_Type (Entity (Decl))
11399 Decl := Remove_Head (L);
11400 Insert_After (Next_Node, Decl);
11401 Set_Analyzed (Decl, False);
11406 -- Next scan the list of declarations and remove each freeze node that
11407 -- appears ahead of the current node.
11409 while Present (Decl) loop
11410 while Present (Next (Decl))
11411 and then Nkind (Next (Decl)) = N_Freeze_Entity
11412 and then Is_Outer_Type (Entity (Next (Decl)))
11414 Next_Decl := Remove_Next (Decl);
11415 Insert_After (Next_Node, Next_Decl);
11416 Set_Analyzed (Next_Decl, False);
11417 Next_Node := Next_Decl;
11420 -- If the declaration is a nested package or concurrent type, then
11421 -- recurse. Nested generic packages will have been processed from the
11424 case Nkind (Decl) is
11425 when N_Package_Declaration =>
11426 Spec := Specification (Decl);
11428 when N_Task_Type_Declaration =>
11429 Spec := Task_Definition (Decl);
11431 when N_Protected_Type_Declaration =>
11432 Spec := Protected_Definition (Decl);
11438 if Present (Spec) then
11439 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
11440 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
11445 end Move_Freeze_Nodes;
11451 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
11453 return Generic_Renamings.Table (E).Next_In_HTable;
11456 ------------------------
11457 -- Preanalyze_Actuals --
11458 ------------------------
11460 procedure Preanalyze_Actuals (N : Node_Id) is
11463 Errs : constant Int := Serious_Errors_Detected;
11465 Cur : Entity_Id := Empty;
11466 -- Current homograph of the instance name
11469 -- Saved visibility status of the current homograph
11472 Assoc := First (Generic_Associations (N));
11474 -- If the instance is a child unit, its name may hide an outer homonym,
11475 -- so make it invisible to perform name resolution on the actuals.
11477 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
11479 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
11481 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
11483 if Is_Compilation_Unit (Cur) then
11484 Vis := Is_Immediately_Visible (Cur);
11485 Set_Is_Immediately_Visible (Cur, False);
11491 while Present (Assoc) loop
11492 if Nkind (Assoc) /= N_Others_Choice then
11493 Act := Explicit_Generic_Actual_Parameter (Assoc);
11495 -- Within a nested instantiation, a defaulted actual is an empty
11496 -- association, so nothing to analyze. If the subprogram actual
11497 -- is an attribute, analyze prefix only, because actual is not a
11498 -- complete attribute reference.
11500 -- If actual is an allocator, analyze expression only. The full
11501 -- analysis can generate code, and if instance is a compilation
11502 -- unit we have to wait until the package instance is installed
11503 -- to have a proper place to insert this code.
11505 -- String literals may be operators, but at this point we do not
11506 -- know whether the actual is a formal subprogram or a string.
11511 elsif Nkind (Act) = N_Attribute_Reference then
11512 Analyze (Prefix (Act));
11514 elsif Nkind (Act) = N_Explicit_Dereference then
11515 Analyze (Prefix (Act));
11517 elsif Nkind (Act) = N_Allocator then
11519 Expr : constant Node_Id := Expression (Act);
11522 if Nkind (Expr) = N_Subtype_Indication then
11523 Analyze (Subtype_Mark (Expr));
11525 -- Analyze separately each discriminant constraint, when
11526 -- given with a named association.
11532 Constr := First (Constraints (Constraint (Expr)));
11533 while Present (Constr) loop
11534 if Nkind (Constr) = N_Discriminant_Association then
11535 Analyze (Expression (Constr));
11549 elsif Nkind (Act) /= N_Operator_Symbol then
11553 if Errs /= Serious_Errors_Detected then
11555 -- Do a minimal analysis of the generic, to prevent spurious
11556 -- warnings complaining about the generic being unreferenced,
11557 -- before abandoning the instantiation.
11559 Analyze (Name (N));
11561 if Is_Entity_Name (Name (N))
11562 and then Etype (Name (N)) /= Any_Type
11564 Generate_Reference (Entity (Name (N)), Name (N));
11565 Set_Is_Instantiated (Entity (Name (N)));
11568 if Present (Cur) then
11570 -- For the case of a child instance hiding an outer homonym,
11571 -- provide additional warning which might explain the error.
11573 Set_Is_Immediately_Visible (Cur, Vis);
11574 Error_Msg_NE ("& hides outer unit with the same name?",
11575 N, Defining_Unit_Name (N));
11578 Abandon_Instantiation (Act);
11585 if Present (Cur) then
11586 Set_Is_Immediately_Visible (Cur, Vis);
11588 end Preanalyze_Actuals;
11590 -------------------
11591 -- Remove_Parent --
11592 -------------------
11594 procedure Remove_Parent (In_Body : Boolean := False) is
11595 S : Entity_Id := Current_Scope;
11596 -- S is the scope containing the instantiation just completed. The scope
11597 -- stack contains the parent instances of the instantiation, followed by
11606 -- After child instantiation is complete, remove from scope stack the
11607 -- extra copy of the current scope, and then remove parent instances.
11609 if not In_Body then
11612 while Current_Scope /= S loop
11613 P := Current_Scope;
11614 End_Package_Scope (Current_Scope);
11616 if In_Open_Scopes (P) then
11617 E := First_Entity (P);
11618 while Present (E) loop
11619 Set_Is_Immediately_Visible (E, True);
11623 -- If instantiation is declared in a block, it is the enclosing
11624 -- scope that might be a parent instance. Note that only one
11625 -- block can be involved, because the parent instances have
11626 -- been installed within it.
11628 if Ekind (P) = E_Block then
11629 Cur_P := Scope (P);
11634 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
11635 -- We are within an instance of some sibling. Retain
11636 -- visibility of parent, for proper subsequent cleanup, and
11637 -- reinstall private declarations as well.
11639 Set_In_Private_Part (P);
11640 Install_Private_Declarations (P);
11643 -- If the ultimate parent is a top-level unit recorded in
11644 -- Instance_Parent_Unit, then reset its visibility to what it was
11645 -- before instantiation. (It's not clear what the purpose is of
11646 -- testing whether Scope (P) is In_Open_Scopes, but that test was
11647 -- present before the ultimate parent test was added.???)
11649 elsif not In_Open_Scopes (Scope (P))
11650 or else (P = Instance_Parent_Unit
11651 and then not Parent_Unit_Visible)
11653 Set_Is_Immediately_Visible (P, False);
11655 -- If the current scope is itself an instantiation of a generic
11656 -- nested within P, and we are in the private part of body of this
11657 -- instantiation, restore the full views of P, that were removed
11658 -- in End_Package_Scope above. This obscure case can occur when a
11659 -- subunit of a generic contains an instance of a child unit of
11660 -- its generic parent unit.
11662 elsif S = Current_Scope and then Is_Generic_Instance (S) then
11664 Par : constant Entity_Id :=
11666 (Specification (Unit_Declaration_Node (S)));
11669 and then P = Scope (Par)
11670 and then (In_Package_Body (S) or else In_Private_Part (S))
11672 Set_In_Private_Part (P);
11673 Install_Private_Declarations (P);
11679 -- Reset visibility of entities in the enclosing scope
11681 Set_Is_Hidden_Open_Scope (Current_Scope, False);
11683 Hidden := First_Elmt (Hidden_Entities);
11684 while Present (Hidden) loop
11685 Set_Is_Immediately_Visible (Node (Hidden), True);
11686 Next_Elmt (Hidden);
11690 -- Each body is analyzed separately, and there is no context that
11691 -- needs preserving from one body instance to the next, so remove all
11692 -- parent scopes that have been installed.
11694 while Present (S) loop
11695 End_Package_Scope (S);
11696 Set_Is_Immediately_Visible (S, False);
11697 S := Current_Scope;
11698 exit when S = Standard_Standard;
11707 procedure Restore_Env is
11708 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
11711 if No (Current_Instantiated_Parent.Act_Id) then
11712 -- Restore environment after subprogram inlining
11714 Restore_Private_Views (Empty);
11717 Current_Instantiated_Parent := Saved.Instantiated_Parent;
11718 Exchanged_Views := Saved.Exchanged_Views;
11719 Hidden_Entities := Saved.Hidden_Entities;
11720 Current_Sem_Unit := Saved.Current_Sem_Unit;
11721 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
11722 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
11724 Restore_Opt_Config_Switches (Saved.Switches);
11726 Instance_Envs.Decrement_Last;
11729 ---------------------------
11730 -- Restore_Private_Views --
11731 ---------------------------
11733 procedure Restore_Private_Views
11734 (Pack_Id : Entity_Id;
11735 Is_Package : Boolean := True)
11740 Dep_Elmt : Elmt_Id;
11743 procedure Restore_Nested_Formal (Formal : Entity_Id);
11744 -- Hide the generic formals of formal packages declared with box which
11745 -- were reachable in the current instantiation.
11747 ---------------------------
11748 -- Restore_Nested_Formal --
11749 ---------------------------
11751 procedure Restore_Nested_Formal (Formal : Entity_Id) is
11755 if Present (Renamed_Object (Formal))
11756 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
11760 elsif Present (Associated_Formal_Package (Formal)) then
11761 Ent := First_Entity (Formal);
11762 while Present (Ent) loop
11763 exit when Ekind (Ent) = E_Package
11764 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
11766 Set_Is_Hidden (Ent);
11767 Set_Is_Potentially_Use_Visible (Ent, False);
11769 -- If package, then recurse
11771 if Ekind (Ent) = E_Package then
11772 Restore_Nested_Formal (Ent);
11778 end Restore_Nested_Formal;
11780 -- Start of processing for Restore_Private_Views
11783 M := First_Elmt (Exchanged_Views);
11784 while Present (M) loop
11787 -- Subtypes of types whose views have been exchanged, and that are
11788 -- defined within the instance, were not on the Private_Dependents
11789 -- list on entry to the instance, so they have to be exchanged
11790 -- explicitly now, in order to remain consistent with the view of the
11793 if Ekind_In (Typ, E_Private_Type,
11794 E_Limited_Private_Type,
11795 E_Record_Type_With_Private)
11797 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
11798 while Present (Dep_Elmt) loop
11799 Dep_Typ := Node (Dep_Elmt);
11801 if Scope (Dep_Typ) = Pack_Id
11802 and then Present (Full_View (Dep_Typ))
11804 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
11805 Exchange_Declarations (Dep_Typ);
11808 Next_Elmt (Dep_Elmt);
11812 Exchange_Declarations (Node (M));
11816 if No (Pack_Id) then
11820 -- Make the generic formal parameters private, and make the formal types
11821 -- into subtypes of the actuals again.
11823 E := First_Entity (Pack_Id);
11824 while Present (E) loop
11825 Set_Is_Hidden (E, True);
11828 and then Nkind (Parent (E)) = N_Subtype_Declaration
11830 Set_Is_Generic_Actual_Type (E, False);
11832 -- An unusual case of aliasing: the actual may also be directly
11833 -- visible in the generic, and be private there, while it is fully
11834 -- visible in the context of the instance. The internal subtype
11835 -- is private in the instance but has full visibility like its
11836 -- parent in the enclosing scope. This enforces the invariant that
11837 -- the privacy status of all private dependents of a type coincide
11838 -- with that of the parent type. This can only happen when a
11839 -- generic child unit is instantiated within a sibling.
11841 if Is_Private_Type (E)
11842 and then not Is_Private_Type (Etype (E))
11844 Exchange_Declarations (E);
11847 elsif Ekind (E) = E_Package then
11849 -- The end of the renaming list is the renaming of the generic
11850 -- package itself. If the instance is a subprogram, all entities
11851 -- in the corresponding package are renamings. If this entity is
11852 -- a formal package, make its own formals private as well. The
11853 -- actual in this case is itself the renaming of an instantiation.
11854 -- If the entity is not a package renaming, it is the entity
11855 -- created to validate formal package actuals: ignore it.
11857 -- If the actual is itself a formal package for the enclosing
11858 -- generic, or the actual for such a formal package, it remains
11859 -- visible on exit from the instance, and therefore nothing needs
11860 -- to be done either, except to keep it accessible.
11862 if Is_Package and then Renamed_Object (E) = Pack_Id then
11865 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
11869 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
11871 Set_Is_Hidden (E, False);
11875 Act_P : constant Entity_Id := Renamed_Object (E);
11879 Id := First_Entity (Act_P);
11881 and then Id /= First_Private_Entity (Act_P)
11883 exit when Ekind (Id) = E_Package
11884 and then Renamed_Object (Id) = Act_P;
11886 Set_Is_Hidden (Id, True);
11887 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
11889 if Ekind (Id) = E_Package then
11890 Restore_Nested_Formal (Id);
11901 end Restore_Private_Views;
11908 (Gen_Unit : Entity_Id;
11909 Act_Unit : Entity_Id)
11913 Set_Instance_Env (Gen_Unit, Act_Unit);
11916 ----------------------------
11917 -- Save_Global_References --
11918 ----------------------------
11920 procedure Save_Global_References (N : Node_Id) is
11921 Gen_Scope : Entity_Id;
11925 function Is_Global (E : Entity_Id) return Boolean;
11926 -- Check whether entity is defined outside of generic unit. Examine the
11927 -- scope of an entity, and the scope of the scope, etc, until we find
11928 -- either Standard, in which case the entity is global, or the generic
11929 -- unit itself, which indicates that the entity is local. If the entity
11930 -- is the generic unit itself, as in the case of a recursive call, or
11931 -- the enclosing generic unit, if different from the current scope, then
11932 -- it is local as well, because it will be replaced at the point of
11933 -- instantiation. On the other hand, if it is a reference to a child
11934 -- unit of a common ancestor, which appears in an instantiation, it is
11935 -- global because it is used to denote a specific compilation unit at
11936 -- the time the instantiations will be analyzed.
11938 procedure Reset_Entity (N : Node_Id);
11939 -- Save semantic information on global entity so that it is not resolved
11940 -- again at instantiation time.
11942 procedure Save_Entity_Descendants (N : Node_Id);
11943 -- Apply Save_Global_References to the two syntactic descendants of
11944 -- non-terminal nodes that carry an Associated_Node and are processed
11945 -- through Reset_Entity. Once the global entity (if any) has been
11946 -- captured together with its type, only two syntactic descendants need
11947 -- to be traversed to complete the processing of the tree rooted at N.
11948 -- This applies to Selected_Components, Expanded_Names, and to Operator
11949 -- nodes. N can also be a character literal, identifier, or operator
11950 -- symbol node, but the call has no effect in these cases.
11952 procedure Save_Global_Defaults (N1, N2 : Node_Id);
11953 -- Default actuals in nested instances must be handled specially
11954 -- because there is no link to them from the original tree. When an
11955 -- actual subprogram is given by a default, we add an explicit generic
11956 -- association for it in the instantiation node. When we save the
11957 -- global references on the name of the instance, we recover the list
11958 -- of generic associations, and add an explicit one to the original
11959 -- generic tree, through which a global actual can be preserved.
11960 -- Similarly, if a child unit is instantiated within a sibling, in the
11961 -- context of the parent, we must preserve the identifier of the parent
11962 -- so that it can be properly resolved in a subsequent instantiation.
11964 procedure Save_Global_Descendant (D : Union_Id);
11965 -- Apply Save_Global_References recursively to the descendents of the
11968 procedure Save_References (N : Node_Id);
11969 -- This is the recursive procedure that does the work, once the
11970 -- enclosing generic scope has been established.
11976 function Is_Global (E : Entity_Id) return Boolean is
11979 function Is_Instance_Node (Decl : Node_Id) return Boolean;
11980 -- Determine whether the parent node of a reference to a child unit
11981 -- denotes an instantiation or a formal package, in which case the
11982 -- reference to the child unit is global, even if it appears within
11983 -- the current scope (e.g. when the instance appears within the body
11984 -- of an ancestor).
11986 ----------------------
11987 -- Is_Instance_Node --
11988 ----------------------
11990 function Is_Instance_Node (Decl : Node_Id) return Boolean is
11992 return Nkind (Decl) in N_Generic_Instantiation
11994 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
11995 end Is_Instance_Node;
11997 -- Start of processing for Is_Global
12000 if E = Gen_Scope then
12003 elsif E = Standard_Standard then
12006 elsif Is_Child_Unit (E)
12007 and then (Is_Instance_Node (Parent (N2))
12008 or else (Nkind (Parent (N2)) = N_Expanded_Name
12009 and then N2 = Selector_Name (Parent (N2))
12011 Is_Instance_Node (Parent (Parent (N2)))))
12017 while Se /= Gen_Scope loop
12018 if Se = Standard_Standard then
12033 procedure Reset_Entity (N : Node_Id) is
12035 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
12036 -- If the type of N2 is global to the generic unit. Save the type in
12037 -- the generic node.
12038 -- What does this comment mean???
12040 function Top_Ancestor (E : Entity_Id) return Entity_Id;
12041 -- Find the ultimate ancestor of the current unit. If it is not a
12042 -- generic unit, then the name of the current unit in the prefix of
12043 -- an expanded name must be replaced with its generic homonym to
12044 -- ensure that it will be properly resolved in an instance.
12046 ---------------------
12047 -- Set_Global_Type --
12048 ---------------------
12050 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
12051 Typ : constant Entity_Id := Etype (N2);
12054 Set_Etype (N, Typ);
12056 if Entity (N) /= N2
12057 and then Has_Private_View (Entity (N))
12059 -- If the entity of N is not the associated node, this is a
12060 -- nested generic and it has an associated node as well, whose
12061 -- type is already the full view (see below). Indicate that the
12062 -- original node has a private view.
12064 Set_Has_Private_View (N);
12067 -- If not a private type, nothing else to do
12069 if not Is_Private_Type (Typ) then
12070 if Is_Array_Type (Typ)
12071 and then Is_Private_Type (Component_Type (Typ))
12073 Set_Has_Private_View (N);
12076 -- If it is a derivation of a private type in a context where no
12077 -- full view is needed, nothing to do either.
12079 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
12082 -- Otherwise mark the type for flipping and use the full view when
12086 Set_Has_Private_View (N);
12088 if Present (Full_View (Typ)) then
12089 Set_Etype (N2, Full_View (Typ));
12092 end Set_Global_Type;
12098 function Top_Ancestor (E : Entity_Id) return Entity_Id is
12103 while Is_Child_Unit (Par) loop
12104 Par := Scope (Par);
12110 -- Start of processing for Reset_Entity
12113 N2 := Get_Associated_Node (N);
12116 if Present (E) then
12118 -- If the node is an entry call to an entry in an enclosing task,
12119 -- it is rewritten as a selected component. No global entity to
12120 -- preserve in this case, since the expansion will be redone in
12123 if not Nkind_In (E, N_Defining_Identifier,
12124 N_Defining_Character_Literal,
12125 N_Defining_Operator_Symbol)
12127 Set_Associated_Node (N, Empty);
12128 Set_Etype (N, Empty);
12132 -- If the entity is an itype created as a subtype of an access
12133 -- type with a null exclusion restore source entity for proper
12134 -- visibility. The itype will be created anew in the instance.
12137 and then Ekind (E) = E_Access_Subtype
12138 and then Is_Entity_Name (N)
12139 and then Chars (Etype (E)) = Chars (N)
12142 Set_Entity (N2, E);
12146 if Is_Global (E) then
12147 Set_Global_Type (N, N2);
12149 elsif Nkind (N) = N_Op_Concat
12150 and then Is_Generic_Type (Etype (N2))
12151 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
12153 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
12154 and then Is_Intrinsic_Subprogram (E)
12159 -- Entity is local. Mark generic node as unresolved.
12160 -- Note that now it does not have an entity.
12162 Set_Associated_Node (N, Empty);
12163 Set_Etype (N, Empty);
12166 if Nkind (Parent (N)) in N_Generic_Instantiation
12167 and then N = Name (Parent (N))
12169 Save_Global_Defaults (Parent (N), Parent (N2));
12172 elsif Nkind (Parent (N)) = N_Selected_Component
12173 and then Nkind (Parent (N2)) = N_Expanded_Name
12175 if Is_Global (Entity (Parent (N2))) then
12176 Change_Selected_Component_To_Expanded_Name (Parent (N));
12177 Set_Associated_Node (Parent (N), Parent (N2));
12178 Set_Global_Type (Parent (N), Parent (N2));
12179 Save_Entity_Descendants (N);
12181 -- If this is a reference to the current generic entity, replace
12182 -- by the name of the generic homonym of the current package. This
12183 -- is because in an instantiation Par.P.Q will not resolve to the
12184 -- name of the instance, whose enclosing scope is not necessarily
12185 -- Par. We use the generic homonym rather that the name of the
12186 -- generic itself because it may be hidden by a local declaration.
12188 elsif In_Open_Scopes (Entity (Parent (N2)))
12190 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
12192 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
12193 Rewrite (Parent (N),
12194 Make_Identifier (Sloc (N),
12196 Chars (Generic_Homonym (Entity (Parent (N2))))));
12198 Rewrite (Parent (N),
12199 Make_Identifier (Sloc (N),
12200 Chars => Chars (Selector_Name (Parent (N2)))));
12204 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
12205 and then Parent (N) = Name (Parent (Parent (N)))
12207 Save_Global_Defaults
12208 (Parent (Parent (N)), Parent (Parent ((N2))));
12211 -- A selected component may denote a static constant that has been
12212 -- folded. If the static constant is global to the generic, capture
12213 -- its value. Otherwise the folding will happen in any instantiation.
12215 elsif Nkind (Parent (N)) = N_Selected_Component
12216 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
12218 if Present (Entity (Original_Node (Parent (N2))))
12219 and then Is_Global (Entity (Original_Node (Parent (N2))))
12221 Rewrite (Parent (N), New_Copy (Parent (N2)));
12222 Set_Analyzed (Parent (N), False);
12228 -- A selected component may be transformed into a parameterless
12229 -- function call. If the called entity is global, rewrite the node
12230 -- appropriately, i.e. as an extended name for the global entity.
12232 elsif Nkind (Parent (N)) = N_Selected_Component
12233 and then Nkind (Parent (N2)) = N_Function_Call
12234 and then N = Selector_Name (Parent (N))
12236 if No (Parameter_Associations (Parent (N2))) then
12237 if Is_Global (Entity (Name (Parent (N2)))) then
12238 Change_Selected_Component_To_Expanded_Name (Parent (N));
12239 Set_Associated_Node (Parent (N), Name (Parent (N2)));
12240 Set_Global_Type (Parent (N), Name (Parent (N2)));
12241 Save_Entity_Descendants (N);
12244 Set_Associated_Node (N, Empty);
12245 Set_Etype (N, Empty);
12248 -- In Ada 2005, X.F may be a call to a primitive operation,
12249 -- rewritten as F (X). This rewriting will be done again in an
12250 -- instance, so keep the original node. Global entities will be
12251 -- captured as for other constructs.
12257 -- Entity is local. Reset in generic unit, so that node is resolved
12258 -- anew at the point of instantiation.
12261 Set_Associated_Node (N, Empty);
12262 Set_Etype (N, Empty);
12266 -----------------------------
12267 -- Save_Entity_Descendants --
12268 -----------------------------
12270 procedure Save_Entity_Descendants (N : Node_Id) is
12273 when N_Binary_Op =>
12274 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
12275 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12278 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12280 when N_Expanded_Name | N_Selected_Component =>
12281 Save_Global_Descendant (Union_Id (Prefix (N)));
12282 Save_Global_Descendant (Union_Id (Selector_Name (N)));
12284 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
12288 raise Program_Error;
12290 end Save_Entity_Descendants;
12292 --------------------------
12293 -- Save_Global_Defaults --
12294 --------------------------
12296 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
12297 Loc : constant Source_Ptr := Sloc (N1);
12298 Assoc2 : constant List_Id := Generic_Associations (N2);
12299 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
12306 Actual : Entity_Id;
12309 Assoc1 := Generic_Associations (N1);
12311 if Present (Assoc1) then
12312 Act1 := First (Assoc1);
12315 Set_Generic_Associations (N1, New_List);
12316 Assoc1 := Generic_Associations (N1);
12319 if Present (Assoc2) then
12320 Act2 := First (Assoc2);
12325 while Present (Act1) and then Present (Act2) loop
12330 -- Find the associations added for default subprograms
12332 if Present (Act2) then
12333 while Nkind (Act2) /= N_Generic_Association
12334 or else No (Entity (Selector_Name (Act2)))
12335 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
12340 -- Add a similar association if the default is global. The
12341 -- renaming declaration for the actual has been analyzed, and
12342 -- its alias is the program it renames. Link the actual in the
12343 -- original generic tree with the node in the analyzed tree.
12345 while Present (Act2) loop
12346 Subp := Entity (Selector_Name (Act2));
12347 Def := Explicit_Generic_Actual_Parameter (Act2);
12349 -- Following test is defence against rubbish errors
12351 if No (Alias (Subp)) then
12355 -- Retrieve the resolved actual from the renaming declaration
12356 -- created for the instantiated formal.
12358 Actual := Entity (Name (Parent (Parent (Subp))));
12359 Set_Entity (Def, Actual);
12360 Set_Etype (Def, Etype (Actual));
12362 if Is_Global (Actual) then
12364 Make_Generic_Association (Loc,
12365 Selector_Name => New_Occurrence_Of (Subp, Loc),
12366 Explicit_Generic_Actual_Parameter =>
12367 New_Occurrence_Of (Actual, Loc));
12369 Set_Associated_Node
12370 (Explicit_Generic_Actual_Parameter (Ndec), Def);
12372 Append (Ndec, Assoc1);
12374 -- If there are other defaults, add a dummy association in case
12375 -- there are other defaulted formals with the same name.
12377 elsif Present (Next (Act2)) then
12379 Make_Generic_Association (Loc,
12380 Selector_Name => New_Occurrence_Of (Subp, Loc),
12381 Explicit_Generic_Actual_Parameter => Empty);
12383 Append (Ndec, Assoc1);
12390 if Nkind (Name (N1)) = N_Identifier
12391 and then Is_Child_Unit (Gen_Id)
12392 and then Is_Global (Gen_Id)
12393 and then Is_Generic_Unit (Scope (Gen_Id))
12394 and then In_Open_Scopes (Scope (Gen_Id))
12396 -- This is an instantiation of a child unit within a sibling, so
12397 -- that the generic parent is in scope. An eventual instance must
12398 -- occur within the scope of an instance of the parent. Make name
12399 -- in instance into an expanded name, to preserve the identifier
12400 -- of the parent, so it can be resolved subsequently.
12402 Rewrite (Name (N2),
12403 Make_Expanded_Name (Loc,
12404 Chars => Chars (Gen_Id),
12405 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
12406 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
12407 Set_Entity (Name (N2), Gen_Id);
12409 Rewrite (Name (N1),
12410 Make_Expanded_Name (Loc,
12411 Chars => Chars (Gen_Id),
12412 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
12413 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
12415 Set_Associated_Node (Name (N1), Name (N2));
12416 Set_Associated_Node (Prefix (Name (N1)), Empty);
12417 Set_Associated_Node
12418 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
12419 Set_Etype (Name (N1), Etype (Gen_Id));
12422 end Save_Global_Defaults;
12424 ----------------------------
12425 -- Save_Global_Descendant --
12426 ----------------------------
12428 procedure Save_Global_Descendant (D : Union_Id) is
12432 if D in Node_Range then
12433 if D = Union_Id (Empty) then
12436 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
12437 Save_References (Node_Id (D));
12440 elsif D in List_Range then
12441 if D = Union_Id (No_List)
12442 or else Is_Empty_List (List_Id (D))
12447 N1 := First (List_Id (D));
12448 while Present (N1) loop
12449 Save_References (N1);
12454 -- Element list or other non-node field, nothing to do
12459 end Save_Global_Descendant;
12461 ---------------------
12462 -- Save_References --
12463 ---------------------
12465 -- This is the recursive procedure that does the work once the enclosing
12466 -- generic scope has been established. We have to treat specially a
12467 -- number of node rewritings that are required by semantic processing
12468 -- and which change the kind of nodes in the generic copy: typically
12469 -- constant-folding, replacing an operator node by a string literal, or
12470 -- a selected component by an expanded name. In each of those cases, the
12471 -- transformation is propagated to the generic unit.
12473 procedure Save_References (N : Node_Id) is
12474 Loc : constant Source_Ptr := Sloc (N);
12480 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
12481 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12484 elsif Nkind (N) = N_Operator_Symbol
12485 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
12487 Change_Operator_Symbol_To_String_Literal (N);
12490 elsif Nkind (N) in N_Op then
12491 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12492 if Nkind (N) = N_Op_Concat then
12493 Set_Is_Component_Left_Opnd (N,
12494 Is_Component_Left_Opnd (Get_Associated_Node (N)));
12496 Set_Is_Component_Right_Opnd (N,
12497 Is_Component_Right_Opnd (Get_Associated_Node (N)));
12503 -- Node may be transformed into call to a user-defined operator
12505 N2 := Get_Associated_Node (N);
12507 if Nkind (N2) = N_Function_Call then
12508 E := Entity (Name (N2));
12511 and then Is_Global (E)
12513 Set_Etype (N, Etype (N2));
12515 Set_Associated_Node (N, Empty);
12516 Set_Etype (N, Empty);
12519 elsif Nkind_In (N2, N_Integer_Literal,
12523 if Present (Original_Node (N2))
12524 and then Nkind (Original_Node (N2)) = Nkind (N)
12527 -- Operation was constant-folded. Whenever possible,
12528 -- recover semantic information from unfolded node,
12531 Set_Associated_Node (N, Original_Node (N2));
12533 if Nkind (N) = N_Op_Concat then
12534 Set_Is_Component_Left_Opnd (N,
12535 Is_Component_Left_Opnd (Get_Associated_Node (N)));
12536 Set_Is_Component_Right_Opnd (N,
12537 Is_Component_Right_Opnd (Get_Associated_Node (N)));
12543 -- If original node is already modified, propagate
12544 -- constant-folding to template.
12546 Rewrite (N, New_Copy (N2));
12547 Set_Analyzed (N, False);
12550 elsif Nkind (N2) = N_Identifier
12551 and then Ekind (Entity (N2)) = E_Enumeration_Literal
12553 -- Same if call was folded into a literal, but in this case
12554 -- retain the entity to avoid spurious ambiguities if it is
12555 -- overloaded at the point of instantiation or inlining.
12557 Rewrite (N, New_Copy (N2));
12558 Set_Analyzed (N, False);
12562 -- Complete operands check if node has not been constant-folded
12564 if Nkind (N) in N_Op then
12565 Save_Entity_Descendants (N);
12568 elsif Nkind (N) = N_Identifier then
12569 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12571 -- If this is a discriminant reference, always save it. It is
12572 -- used in the instance to find the corresponding discriminant
12573 -- positionally rather than by name.
12575 Set_Original_Discriminant
12576 (N, Original_Discriminant (Get_Associated_Node (N)));
12580 N2 := Get_Associated_Node (N);
12582 if Nkind (N2) = N_Function_Call then
12583 E := Entity (Name (N2));
12585 -- Name resolves to a call to parameterless function. If
12586 -- original entity is global, mark node as resolved.
12589 and then Is_Global (E)
12591 Set_Etype (N, Etype (N2));
12593 Set_Associated_Node (N, Empty);
12594 Set_Etype (N, Empty);
12597 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
12598 and then Is_Entity_Name (Original_Node (N2))
12600 -- Name resolves to named number that is constant-folded,
12601 -- We must preserve the original name for ASIS use, and
12602 -- undo the constant-folding, which will be repeated in
12605 Set_Associated_Node (N, Original_Node (N2));
12608 elsif Nkind (N2) = N_String_Literal then
12610 -- Name resolves to string literal. Perform the same
12611 -- replacement in generic.
12613 Rewrite (N, New_Copy (N2));
12615 elsif Nkind (N2) = N_Explicit_Dereference then
12617 -- An identifier is rewritten as a dereference if it is the
12618 -- prefix in an implicit dereference (call or attribute).
12619 -- The analysis of an instantiation will expand the node
12620 -- again, so we preserve the original tree but link it to
12621 -- the resolved entity in case it is global.
12623 if Is_Entity_Name (Prefix (N2))
12624 and then Present (Entity (Prefix (N2)))
12625 and then Is_Global (Entity (Prefix (N2)))
12627 Set_Associated_Node (N, Prefix (N2));
12629 elsif Nkind (Prefix (N2)) = N_Function_Call
12630 and then Is_Global (Entity (Name (Prefix (N2))))
12633 Make_Explicit_Dereference (Loc,
12634 Prefix => Make_Function_Call (Loc,
12636 New_Occurrence_Of (Entity (Name (Prefix (N2))),
12640 Set_Associated_Node (N, Empty);
12641 Set_Etype (N, Empty);
12644 -- The subtype mark of a nominally unconstrained object is
12645 -- rewritten as a subtype indication using the bounds of the
12646 -- expression. Recover the original subtype mark.
12648 elsif Nkind (N2) = N_Subtype_Indication
12649 and then Is_Entity_Name (Original_Node (N2))
12651 Set_Associated_Node (N, Original_Node (N2));
12659 elsif Nkind (N) in N_Entity then
12664 Qual : Node_Id := Empty;
12665 Typ : Entity_Id := Empty;
12668 use Atree.Unchecked_Access;
12669 -- This code section is part of implementing an untyped tree
12670 -- traversal, so it needs direct access to node fields.
12673 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
12674 N2 := Get_Associated_Node (N);
12681 -- In an instance within a generic, use the name of the
12682 -- actual and not the original generic parameter. If the
12683 -- actual is global in the current generic it must be
12684 -- preserved for its instantiation.
12686 if Nkind (Parent (Typ)) = N_Subtype_Declaration
12688 Present (Generic_Parent_Type (Parent (Typ)))
12690 Typ := Base_Type (Typ);
12691 Set_Etype (N2, Typ);
12697 or else not Is_Global (Typ)
12699 Set_Associated_Node (N, Empty);
12701 -- If the aggregate is an actual in a call, it has been
12702 -- resolved in the current context, to some local type.
12703 -- The enclosing call may have been disambiguated by the
12704 -- aggregate, and this disambiguation might fail at
12705 -- instantiation time because the type to which the
12706 -- aggregate did resolve is not preserved. In order to
12707 -- preserve some of this information, we wrap the
12708 -- aggregate in a qualified expression, using the id of
12709 -- its type. For further disambiguation we qualify the
12710 -- type name with its scope (if visible) because both
12711 -- id's will have corresponding entities in an instance.
12712 -- This resolves most of the problems with missing type
12713 -- information on aggregates in instances.
12715 if Nkind (N2) = Nkind (N)
12717 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
12719 and then Comes_From_Source (Typ)
12721 if Is_Immediately_Visible (Scope (Typ)) then
12722 Nam := Make_Selected_Component (Loc,
12724 Make_Identifier (Loc, Chars (Scope (Typ))),
12726 Make_Identifier (Loc, Chars (Typ)));
12728 Nam := Make_Identifier (Loc, Chars (Typ));
12732 Make_Qualified_Expression (Loc,
12733 Subtype_Mark => Nam,
12734 Expression => Relocate_Node (N));
12738 Save_Global_Descendant (Field1 (N));
12739 Save_Global_Descendant (Field2 (N));
12740 Save_Global_Descendant (Field3 (N));
12741 Save_Global_Descendant (Field5 (N));
12743 if Present (Qual) then
12747 -- All other cases than aggregates
12750 Save_Global_Descendant (Field1 (N));
12751 Save_Global_Descendant (Field2 (N));
12752 Save_Global_Descendant (Field3 (N));
12753 Save_Global_Descendant (Field4 (N));
12754 Save_Global_Descendant (Field5 (N));
12759 -- If a node has aspects, references within their expressions must
12760 -- be saved separately, given that they are not directly in the
12763 if Has_Aspects (N) then
12767 Aspect := First (Aspect_Specifications (N));
12768 while Present (Aspect) loop
12769 Save_Global_References (Expression (Aspect));
12774 end Save_References;
12776 -- Start of processing for Save_Global_References
12779 Gen_Scope := Current_Scope;
12781 -- If the generic unit is a child unit, references to entities in the
12782 -- parent are treated as local, because they will be resolved anew in
12783 -- the context of the instance of the parent.
12785 while Is_Child_Unit (Gen_Scope)
12786 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
12788 Gen_Scope := Scope (Gen_Scope);
12791 Save_References (N);
12792 end Save_Global_References;
12794 --------------------------------------
12795 -- Set_Copied_Sloc_For_Inlined_Body --
12796 --------------------------------------
12798 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
12800 Create_Instantiation_Source (N, E, True, S_Adjustment);
12801 end Set_Copied_Sloc_For_Inlined_Body;
12803 ---------------------
12804 -- Set_Instance_Of --
12805 ---------------------
12807 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
12809 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
12810 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
12811 Generic_Renamings.Increment_Last;
12812 end Set_Instance_Of;
12814 --------------------
12815 -- Set_Next_Assoc --
12816 --------------------
12818 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
12820 Generic_Renamings.Table (E).Next_In_HTable := Next;
12821 end Set_Next_Assoc;
12823 -------------------
12824 -- Start_Generic --
12825 -------------------
12827 procedure Start_Generic is
12829 -- ??? More things could be factored out in this routine.
12830 -- Should probably be done at a later stage.
12832 Generic_Flags.Append (Inside_A_Generic);
12833 Inside_A_Generic := True;
12835 Expander_Mode_Save_And_Set (False);
12838 ----------------------
12839 -- Set_Instance_Env --
12840 ----------------------
12842 procedure Set_Instance_Env
12843 (Gen_Unit : Entity_Id;
12844 Act_Unit : Entity_Id)
12847 -- Regardless of the current mode, predefined units are analyzed in the
12848 -- most current Ada mode, and earlier version Ada checks do not apply
12849 -- to predefined units. Nothing needs to be done for non-internal units.
12850 -- These are always analyzed in the current mode.
12852 if Is_Internal_File_Name
12853 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
12854 Renamings_Included => True)
12856 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
12859 Current_Instantiated_Parent :=
12860 (Gen_Id => Gen_Unit,
12861 Act_Id => Act_Unit,
12862 Next_In_HTable => Assoc_Null);
12863 end Set_Instance_Env;
12869 procedure Switch_View (T : Entity_Id) is
12870 BT : constant Entity_Id := Base_Type (T);
12871 Priv_Elmt : Elmt_Id := No_Elmt;
12872 Priv_Sub : Entity_Id;
12875 -- T may be private but its base type may have been exchanged through
12876 -- some other occurrence, in which case there is nothing to switch
12877 -- besides T itself. Note that a private dependent subtype of a private
12878 -- type might not have been switched even if the base type has been,
12879 -- because of the last branch of Check_Private_View (see comment there).
12881 if not Is_Private_Type (BT) then
12882 Prepend_Elmt (Full_View (T), Exchanged_Views);
12883 Exchange_Declarations (T);
12887 Priv_Elmt := First_Elmt (Private_Dependents (BT));
12889 if Present (Full_View (BT)) then
12890 Prepend_Elmt (Full_View (BT), Exchanged_Views);
12891 Exchange_Declarations (BT);
12894 while Present (Priv_Elmt) loop
12895 Priv_Sub := (Node (Priv_Elmt));
12897 -- We avoid flipping the subtype if the Etype of its full view is
12898 -- private because this would result in a malformed subtype. This
12899 -- occurs when the Etype of the subtype full view is the full view of
12900 -- the base type (and since the base types were just switched, the
12901 -- subtype is pointing to the wrong view). This is currently the case
12902 -- for tagged record types, access types (maybe more?) and needs to
12903 -- be resolved. ???
12905 if Present (Full_View (Priv_Sub))
12906 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
12908 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
12909 Exchange_Declarations (Priv_Sub);
12912 Next_Elmt (Priv_Elmt);
12916 -----------------------------
12917 -- Valid_Default_Attribute --
12918 -----------------------------
12920 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
12921 Attr_Id : constant Attribute_Id :=
12922 Get_Attribute_Id (Attribute_Name (Def));
12923 T : constant Entity_Id := Entity (Prefix (Def));
12924 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
12937 F := First_Formal (Nam);
12938 while Present (F) loop
12939 Num_F := Num_F + 1;
12944 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12945 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12946 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12947 Attribute_Unbiased_Rounding =>
12950 and then Is_Floating_Point_Type (T);
12952 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12953 Attribute_Value | Attribute_Wide_Image |
12954 Attribute_Wide_Value =>
12955 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
12957 when Attribute_Max | Attribute_Min =>
12958 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
12960 when Attribute_Input =>
12961 OK := (Is_Fun and then Num_F = 1);
12963 when Attribute_Output | Attribute_Read | Attribute_Write =>
12964 OK := (not Is_Fun and then Num_F = 2);
12971 Error_Msg_N ("attribute reference has wrong profile for subprogram",
12974 end Valid_Default_Attribute;