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 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4458 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4460 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4461 Check_Elab_Instantiation (N);
4464 if Is_Dispatching_Operation (Act_Decl_Id)
4465 and then Ada_Version >= Ada_2005
4471 Formal := First_Formal (Act_Decl_Id);
4472 while Present (Formal) loop
4473 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4474 and then Is_Controlling_Formal (Formal)
4475 and then not Can_Never_Be_Null (Formal)
4477 Error_Msg_NE ("access parameter& is controlling,",
4480 ("\corresponding parameter of & must be"
4481 & " explicitly null-excluding", N, Gen_Id);
4484 Next_Formal (Formal);
4489 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4491 Validate_Categorization_Dependency (N, Act_Decl_Id);
4493 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4494 Inherit_Context (Gen_Decl, N);
4496 Restore_Private_Views (Pack_Id, False);
4498 -- If the context requires a full instantiation, mark node for
4499 -- subsequent construction of the body.
4501 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4503 Check_Forward_Instantiation (Gen_Decl);
4505 -- The wrapper package is always delayed, because it does not
4506 -- constitute a freeze point, but to insure that the freeze
4507 -- node is placed properly, it is created directly when
4508 -- instantiating the body (otherwise the freeze node might
4509 -- appear to early for nested instantiations).
4511 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4513 -- For ASIS purposes, indicate that the wrapper package has
4514 -- replaced the instantiation node.
4516 Rewrite (N, Unit (Parent (N)));
4517 Set_Unit (Parent (N), N);
4520 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4522 -- Replace instance node for library-level instantiations of
4523 -- intrinsic subprograms, for ASIS use.
4525 Rewrite (N, Unit (Parent (N)));
4526 Set_Unit (Parent (N), N);
4529 if Parent_Installed then
4534 Env_Installed := False;
4535 Generic_Renamings.Set_Last (0);
4536 Generic_Renamings_HTable.Reset;
4539 Style_Check := Save_Style_Check;
4542 if Has_Aspects (N) then
4543 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4547 when Instantiation_Error =>
4548 if Parent_Installed then
4552 if Env_Installed then
4556 Style_Check := Save_Style_Check;
4557 end Analyze_Subprogram_Instantiation;
4559 -------------------------
4560 -- Get_Associated_Node --
4561 -------------------------
4563 function Get_Associated_Node (N : Node_Id) return Node_Id is
4567 Assoc := Associated_Node (N);
4569 if Nkind (Assoc) /= Nkind (N) then
4572 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4576 -- If the node is part of an inner generic, it may itself have been
4577 -- remapped into a further generic copy. Associated_Node is otherwise
4578 -- used for the entity of the node, and will be of a different node
4579 -- kind, or else N has been rewritten as a literal or function call.
4581 while Present (Associated_Node (Assoc))
4582 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4584 Assoc := Associated_Node (Assoc);
4587 -- Follow and additional link in case the final node was rewritten.
4588 -- This can only happen with nested generic units.
4590 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4591 and then Present (Associated_Node (Assoc))
4592 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4593 N_Explicit_Dereference,
4598 Assoc := Associated_Node (Assoc);
4603 end Get_Associated_Node;
4605 -------------------------------------------
4606 -- Build_Instance_Compilation_Unit_Nodes --
4607 -------------------------------------------
4609 procedure Build_Instance_Compilation_Unit_Nodes
4614 Decl_Cunit : Node_Id;
4615 Body_Cunit : Node_Id;
4617 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4618 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4621 -- A new compilation unit node is built for the instance declaration
4624 Make_Compilation_Unit (Sloc (N),
4625 Context_Items => Empty_List,
4628 Make_Compilation_Unit_Aux (Sloc (N)));
4630 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4632 -- The new compilation unit is linked to its body, but both share the
4633 -- same file, so we do not set Body_Required on the new unit so as not
4634 -- to create a spurious dependency on a non-existent body in the ali.
4635 -- This simplifies CodePeer unit traversal.
4637 -- We use the original instantiation compilation unit as the resulting
4638 -- compilation unit of the instance, since this is the main unit.
4640 Rewrite (N, Act_Body);
4641 Body_Cunit := Parent (N);
4643 -- The two compilation unit nodes are linked by the Library_Unit field
4645 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4646 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4648 -- Preserve the private nature of the package if needed
4650 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4652 -- If the instance is not the main unit, its context, categorization
4653 -- and elaboration entity are not relevant to the compilation.
4655 if Body_Cunit /= Cunit (Main_Unit) then
4656 Make_Instance_Unit (Body_Cunit, In_Main => False);
4660 -- The context clause items on the instantiation, which are now attached
4661 -- to the body compilation unit (since the body overwrote the original
4662 -- instantiation node), semantically belong on the spec, so copy them
4663 -- there. It's harmless to leave them on the body as well. In fact one
4664 -- could argue that they belong in both places.
4666 Citem := First (Context_Items (Body_Cunit));
4667 while Present (Citem) loop
4668 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4672 -- Propagate categorization flags on packages, so that they appear in
4673 -- the ali file for the spec of the unit.
4675 if Ekind (New_Main) = E_Package then
4676 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4677 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4678 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4679 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4680 Set_Is_Remote_Call_Interface
4681 (Old_Main, Is_Remote_Call_Interface (New_Main));
4684 -- Make entry in Units table, so that binder can generate call to
4685 -- elaboration procedure for body, if any.
4687 Make_Instance_Unit (Body_Cunit, In_Main => True);
4688 Main_Unit_Entity := New_Main;
4689 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4691 -- Build elaboration entity, since the instance may certainly generate
4692 -- elaboration code requiring a flag for protection.
4694 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4695 end Build_Instance_Compilation_Unit_Nodes;
4697 -----------------------------
4698 -- Check_Access_Definition --
4699 -----------------------------
4701 procedure Check_Access_Definition (N : Node_Id) is
4704 (Ada_Version >= Ada_2005
4705 and then Present (Access_Definition (N)));
4707 end Check_Access_Definition;
4709 -----------------------------------
4710 -- Check_Formal_Package_Instance --
4711 -----------------------------------
4713 -- If the formal has specific parameters, they must match those of the
4714 -- actual. Both of them are instances, and the renaming declarations for
4715 -- their formal parameters appear in the same order in both. The analyzed
4716 -- formal has been analyzed in the context of the current instance.
4718 procedure Check_Formal_Package_Instance
4719 (Formal_Pack : Entity_Id;
4720 Actual_Pack : Entity_Id)
4722 E1 : Entity_Id := First_Entity (Actual_Pack);
4723 E2 : Entity_Id := First_Entity (Formal_Pack);
4728 procedure Check_Mismatch (B : Boolean);
4729 -- Common error routine for mismatch between the parameters of the
4730 -- actual instance and those of the formal package.
4732 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4733 -- The formal may come from a nested formal package, and the actual may
4734 -- have been constant-folded. To determine whether the two denote the
4735 -- same entity we may have to traverse several definitions to recover
4736 -- the ultimate entity that they refer to.
4738 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4739 -- Similarly, if the formal comes from a nested formal package, the
4740 -- actual may designate the formal through multiple renamings, which
4741 -- have to be followed to determine the original variable in question.
4743 --------------------
4744 -- Check_Mismatch --
4745 --------------------
4747 procedure Check_Mismatch (B : Boolean) is
4748 Kind : constant Node_Kind := Nkind (Parent (E2));
4751 if Kind = N_Formal_Type_Declaration then
4754 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
4755 N_Formal_Package_Declaration)
4756 or else Kind in N_Formal_Subprogram_Declaration
4762 ("actual for & in actual instance does not match formal",
4763 Parent (Actual_Pack), E1);
4767 --------------------------------
4768 -- Same_Instantiated_Constant --
4769 --------------------------------
4771 function Same_Instantiated_Constant
4772 (E1, E2 : Entity_Id) return Boolean
4778 while Present (Ent) loop
4782 elsif Ekind (Ent) /= E_Constant then
4785 elsif Is_Entity_Name (Constant_Value (Ent)) then
4786 if Entity (Constant_Value (Ent)) = E1 then
4789 Ent := Entity (Constant_Value (Ent));
4792 -- The actual may be a constant that has been folded. Recover
4795 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4796 Ent := Entity (Original_Node (Constant_Value (Ent)));
4803 end Same_Instantiated_Constant;
4805 --------------------------------
4806 -- Same_Instantiated_Variable --
4807 --------------------------------
4809 function Same_Instantiated_Variable
4810 (E1, E2 : Entity_Id) return Boolean
4812 function Original_Entity (E : Entity_Id) return Entity_Id;
4813 -- Follow chain of renamings to the ultimate ancestor
4815 ---------------------
4816 -- Original_Entity --
4817 ---------------------
4819 function Original_Entity (E : Entity_Id) return Entity_Id is
4824 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4825 and then Present (Renamed_Object (Orig))
4826 and then Is_Entity_Name (Renamed_Object (Orig))
4828 Orig := Entity (Renamed_Object (Orig));
4832 end Original_Entity;
4834 -- Start of processing for Same_Instantiated_Variable
4837 return Ekind (E1) = Ekind (E2)
4838 and then Original_Entity (E1) = Original_Entity (E2);
4839 end Same_Instantiated_Variable;
4841 -- Start of processing for Check_Formal_Package_Instance
4845 and then Present (E2)
4847 exit when Ekind (E1) = E_Package
4848 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4850 -- If the formal is the renaming of the formal package, this
4851 -- is the end of its formal part, which may occur before the
4852 -- end of the formal part in the actual in the presence of
4853 -- defaulted parameters in the formal package.
4855 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4856 and then Renamed_Entity (E2) = Scope (E2);
4858 -- The analysis of the actual may generate additional internal
4859 -- entities. If the formal is defaulted, there is no corresponding
4860 -- analysis and the internal entities must be skipped, until we
4861 -- find corresponding entities again.
4863 if Comes_From_Source (E2)
4864 and then not Comes_From_Source (E1)
4865 and then Chars (E1) /= Chars (E2)
4868 and then Chars (E1) /= Chars (E2)
4877 -- If the formal entity comes from a formal declaration, it was
4878 -- defaulted in the formal package, and no check is needed on it.
4880 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4883 elsif Is_Type (E1) then
4885 -- Subtypes must statically match. E1, E2 are the local entities
4886 -- that are subtypes of the actuals. Itypes generated for other
4887 -- parameters need not be checked, the check will be performed
4888 -- on the parameters themselves.
4890 -- If E2 is a formal type declaration, it is a defaulted parameter
4891 -- and needs no checking.
4893 if not Is_Itype (E1)
4894 and then not Is_Itype (E2)
4898 or else Etype (E1) /= Etype (E2)
4899 or else not Subtypes_Statically_Match (E1, E2));
4902 elsif Ekind (E1) = E_Constant then
4904 -- IN parameters must denote the same static value, or the same
4905 -- constant, or the literal null.
4907 Expr1 := Expression (Parent (E1));
4909 if Ekind (E2) /= E_Constant then
4910 Check_Mismatch (True);
4913 Expr2 := Expression (Parent (E2));
4916 if Is_Static_Expression (Expr1) then
4918 if not Is_Static_Expression (Expr2) then
4919 Check_Mismatch (True);
4921 elsif Is_Discrete_Type (Etype (E1)) then
4923 V1 : constant Uint := Expr_Value (Expr1);
4924 V2 : constant Uint := Expr_Value (Expr2);
4926 Check_Mismatch (V1 /= V2);
4929 elsif Is_Real_Type (Etype (E1)) then
4931 V1 : constant Ureal := Expr_Value_R (Expr1);
4932 V2 : constant Ureal := Expr_Value_R (Expr2);
4934 Check_Mismatch (V1 /= V2);
4937 elsif Is_String_Type (Etype (E1))
4938 and then Nkind (Expr1) = N_String_Literal
4940 if Nkind (Expr2) /= N_String_Literal then
4941 Check_Mismatch (True);
4944 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4948 elsif Is_Entity_Name (Expr1) then
4949 if Is_Entity_Name (Expr2) then
4950 if Entity (Expr1) = Entity (Expr2) then
4954 (not Same_Instantiated_Constant
4955 (Entity (Expr1), Entity (Expr2)));
4958 Check_Mismatch (True);
4961 elsif Is_Entity_Name (Original_Node (Expr1))
4962 and then Is_Entity_Name (Expr2)
4964 Same_Instantiated_Constant
4965 (Entity (Original_Node (Expr1)), Entity (Expr2))
4969 elsif Nkind (Expr1) = N_Null then
4970 Check_Mismatch (Nkind (Expr1) /= N_Null);
4973 Check_Mismatch (True);
4976 elsif Ekind (E1) = E_Variable then
4977 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4979 elsif Ekind (E1) = E_Package then
4981 (Ekind (E1) /= Ekind (E2)
4982 or else Renamed_Object (E1) /= Renamed_Object (E2));
4984 elsif Is_Overloadable (E1) then
4986 -- Verify that the actual subprograms match. Note that actuals
4987 -- that are attributes are rewritten as subprograms. If the
4988 -- subprogram in the formal package is defaulted, no check is
4989 -- needed. Note that this can only happen in Ada 2005 when the
4990 -- formal package can be partially parameterized.
4992 if Nkind (Unit_Declaration_Node (E1)) =
4993 N_Subprogram_Renaming_Declaration
4994 and then From_Default (Unit_Declaration_Node (E1))
5000 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
5004 raise Program_Error;
5011 end Check_Formal_Package_Instance;
5013 ---------------------------
5014 -- Check_Formal_Packages --
5015 ---------------------------
5017 procedure Check_Formal_Packages (P_Id : Entity_Id) is
5019 Formal_P : Entity_Id;
5022 -- Iterate through the declarations in the instance, looking for package
5023 -- renaming declarations that denote instances of formal packages. Stop
5024 -- when we find the renaming of the current package itself. The
5025 -- declaration for a formal package without a box is followed by an
5026 -- internal entity that repeats the instantiation.
5028 E := First_Entity (P_Id);
5029 while Present (E) loop
5030 if Ekind (E) = E_Package then
5031 if Renamed_Object (E) = P_Id then
5034 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5037 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
5038 Formal_P := Next_Entity (E);
5039 Check_Formal_Package_Instance (Formal_P, E);
5041 -- After checking, remove the internal validating package. It
5042 -- is only needed for semantic checks, and as it may contain
5043 -- generic formal declarations it should not reach gigi.
5045 Remove (Unit_Declaration_Node (Formal_P));
5051 end Check_Formal_Packages;
5053 ---------------------------------
5054 -- Check_Forward_Instantiation --
5055 ---------------------------------
5057 procedure Check_Forward_Instantiation (Decl : Node_Id) is
5059 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
5062 -- The instantiation appears before the generic body if we are in the
5063 -- scope of the unit containing the generic, either in its spec or in
5064 -- the package body, and before the generic body.
5066 if Ekind (Gen_Comp) = E_Package_Body then
5067 Gen_Comp := Spec_Entity (Gen_Comp);
5070 if In_Open_Scopes (Gen_Comp)
5071 and then No (Corresponding_Body (Decl))
5076 and then not Is_Compilation_Unit (S)
5077 and then not Is_Child_Unit (S)
5079 if Ekind (S) = E_Package then
5080 Set_Has_Forward_Instantiation (S);
5086 end Check_Forward_Instantiation;
5088 ---------------------------
5089 -- Check_Generic_Actuals --
5090 ---------------------------
5092 -- The visibility of the actuals may be different between the point of
5093 -- generic instantiation and the instantiation of the body.
5095 procedure Check_Generic_Actuals
5096 (Instance : Entity_Id;
5097 Is_Formal_Box : Boolean)
5102 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
5103 -- For a formal that is an array type, the component type is often a
5104 -- previous formal in the same unit. The privacy status of the component
5105 -- type will have been examined earlier in the traversal of the
5106 -- corresponding actuals, and this status should not be modified for the
5107 -- array type itself.
5109 -- To detect this case we have to rescan the list of formals, which
5110 -- is usually short enough to ignore the resulting inefficiency.
5112 -----------------------------
5113 -- Denotes_Previous_Actual --
5114 -----------------------------
5116 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
5120 Prev := First_Entity (Instance);
5121 while Present (Prev) loop
5123 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
5124 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
5125 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
5138 end Denotes_Previous_Actual;
5140 -- Start of processing for Check_Generic_Actuals
5143 E := First_Entity (Instance);
5144 while Present (E) loop
5146 and then Nkind (Parent (E)) = N_Subtype_Declaration
5147 and then Scope (Etype (E)) /= Instance
5148 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
5150 if Is_Array_Type (E)
5151 and then Denotes_Previous_Actual (Component_Type (E))
5155 Check_Private_View (Subtype_Indication (Parent (E)));
5158 Set_Is_Generic_Actual_Type (E, True);
5159 Set_Is_Hidden (E, False);
5160 Set_Is_Potentially_Use_Visible (E,
5163 -- We constructed the generic actual type as a subtype of the
5164 -- supplied type. This means that it normally would not inherit
5165 -- subtype specific attributes of the actual, which is wrong for
5166 -- the generic case.
5168 Astype := Ancestor_Subtype (E);
5172 -- This can happen when E is an itype that is the full view of
5173 -- a private type completed, e.g. with a constrained array. In
5174 -- that case, use the first subtype, which will carry size
5175 -- information. The base type itself is unconstrained and will
5178 Astype := First_Subtype (E);
5181 Set_Size_Info (E, (Astype));
5182 Set_RM_Size (E, RM_Size (Astype));
5183 Set_First_Rep_Item (E, First_Rep_Item (Astype));
5185 if Is_Discrete_Or_Fixed_Point_Type (E) then
5186 Set_RM_Size (E, RM_Size (Astype));
5188 -- In nested instances, the base type of an access actual
5189 -- may itself be private, and need to be exchanged.
5191 elsif Is_Access_Type (E)
5192 and then Is_Private_Type (Etype (E))
5195 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
5198 elsif Ekind (E) = E_Package then
5200 -- If this is the renaming for the current instance, we're done.
5201 -- Otherwise it is a formal package. If the corresponding formal
5202 -- was declared with a box, the (instantiations of the) generic
5203 -- formal part are also visible. Otherwise, ignore the entity
5204 -- created to validate the actuals.
5206 if Renamed_Object (E) = Instance then
5209 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
5212 -- The visibility of a formal of an enclosing generic is already
5215 elsif Denotes_Formal_Package (E) then
5218 elsif Present (Associated_Formal_Package (E))
5219 and then not Is_Generic_Formal (E)
5221 if Box_Present (Parent (Associated_Formal_Package (E))) then
5222 Check_Generic_Actuals (Renamed_Object (E), True);
5225 Check_Generic_Actuals (Renamed_Object (E), False);
5228 Set_Is_Hidden (E, False);
5231 -- If this is a subprogram instance (in a wrapper package) the
5232 -- actual is fully visible.
5234 elsif Is_Wrapper_Package (Instance) then
5235 Set_Is_Hidden (E, False);
5237 -- If the formal package is declared with a box, or if the formal
5238 -- parameter is defaulted, it is visible in the body.
5241 or else Is_Visible_Formal (E)
5243 Set_Is_Hidden (E, False);
5246 if Ekind (E) = E_Constant then
5248 -- If the type of the actual is a private type declared in the
5249 -- enclosing scope of the generic unit, the body of the generic
5250 -- sees the full view of the type (because it has to appear in
5251 -- the corresponding package body). If the type is private now,
5252 -- exchange views to restore the proper visiblity in the instance.
5255 Typ : constant Entity_Id := Base_Type (Etype (E));
5256 -- The type of the actual
5261 Parent_Scope : Entity_Id;
5262 -- The enclosing scope of the generic unit
5265 if Is_Wrapper_Package (Instance) then
5269 (Unit_Declaration_Node
5270 (Related_Instance (Instance))));
5274 (Specification (Unit_Declaration_Node (Instance)));
5277 Parent_Scope := Scope (Gen_Id);
5279 -- The exchange is only needed if the generic is defined
5280 -- within a package which is not a common ancestor of the
5281 -- scope of the instance, and is not already in scope.
5283 if Is_Private_Type (Typ)
5284 and then Scope (Typ) = Parent_Scope
5285 and then Scope (Instance) /= Parent_Scope
5286 and then Ekind (Parent_Scope) = E_Package
5287 and then not Is_Child_Unit (Gen_Id)
5291 -- If the type of the entity is a subtype, it may also
5292 -- have to be made visible, together with the base type
5293 -- of its full view, after exchange.
5295 if Is_Private_Type (Etype (E)) then
5296 Switch_View (Etype (E));
5297 Switch_View (Base_Type (Etype (E)));
5305 end Check_Generic_Actuals;
5307 ------------------------------
5308 -- Check_Generic_Child_Unit --
5309 ------------------------------
5311 procedure Check_Generic_Child_Unit
5313 Parent_Installed : in out Boolean)
5315 Loc : constant Source_Ptr := Sloc (Gen_Id);
5316 Gen_Par : Entity_Id := Empty;
5318 Inst_Par : Entity_Id;
5321 function Find_Generic_Child
5323 Id : Node_Id) return Entity_Id;
5324 -- Search generic parent for possible child unit with the given name
5326 function In_Enclosing_Instance return Boolean;
5327 -- Within an instance of the parent, the child unit may be denoted
5328 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5329 -- scopes to locate a possible parent instantiation.
5331 ------------------------
5332 -- Find_Generic_Child --
5333 ------------------------
5335 function Find_Generic_Child
5337 Id : Node_Id) return Entity_Id
5342 -- If entity of name is already set, instance has already been
5343 -- resolved, e.g. in an enclosing instantiation.
5345 if Present (Entity (Id)) then
5346 if Scope (Entity (Id)) = Scop then
5353 E := First_Entity (Scop);
5354 while Present (E) loop
5355 if Chars (E) = Chars (Id)
5356 and then Is_Child_Unit (E)
5358 if Is_Child_Unit (E)
5359 and then not Is_Visible_Child_Unit (E)
5362 ("generic child unit& is not visible", Gen_Id, E);
5374 end Find_Generic_Child;
5376 ---------------------------
5377 -- In_Enclosing_Instance --
5378 ---------------------------
5380 function In_Enclosing_Instance return Boolean is
5381 Enclosing_Instance : Node_Id;
5382 Instance_Decl : Node_Id;
5385 -- We do not inline any call that contains instantiations, except
5386 -- for instantiations of Unchecked_Conversion, so if we are within
5387 -- an inlined body the current instance does not require parents.
5389 if In_Inlined_Body then
5390 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5394 -- Loop to check enclosing scopes
5396 Enclosing_Instance := Current_Scope;
5397 while Present (Enclosing_Instance) loop
5398 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5400 if Ekind (Enclosing_Instance) = E_Package
5401 and then Is_Generic_Instance (Enclosing_Instance)
5403 (Generic_Parent (Specification (Instance_Decl)))
5405 -- Check whether the generic we are looking for is a child of
5408 E := Find_Generic_Child
5409 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5410 exit when Present (E);
5416 Enclosing_Instance := Scope (Enclosing_Instance);
5428 Make_Expanded_Name (Loc,
5430 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5431 Selector_Name => New_Occurrence_Of (E, Loc)));
5433 Set_Entity (Gen_Id, E);
5434 Set_Etype (Gen_Id, Etype (E));
5435 Parent_Installed := False; -- Already in scope.
5438 end In_Enclosing_Instance;
5440 -- Start of processing for Check_Generic_Child_Unit
5443 -- If the name of the generic is given by a selected component, it may
5444 -- be the name of a generic child unit, and the prefix is the name of an
5445 -- instance of the parent, in which case the child unit must be visible.
5446 -- If this instance is not in scope, it must be placed there and removed
5447 -- after instantiation, because what is being instantiated is not the
5448 -- original child, but the corresponding child present in the instance
5451 -- If the child is instantiated within the parent, it can be given by
5452 -- a simple name. In this case the instance is already in scope, but
5453 -- the child generic must be recovered from the generic parent as well.
5455 if Nkind (Gen_Id) = N_Selected_Component then
5456 S := Selector_Name (Gen_Id);
5457 Analyze (Prefix (Gen_Id));
5458 Inst_Par := Entity (Prefix (Gen_Id));
5460 if Ekind (Inst_Par) = E_Package
5461 and then Present (Renamed_Object (Inst_Par))
5463 Inst_Par := Renamed_Object (Inst_Par);
5466 if Ekind (Inst_Par) = E_Package then
5467 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5468 Gen_Par := Generic_Parent (Parent (Inst_Par));
5470 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5472 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5474 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5477 elsif Ekind (Inst_Par) = E_Generic_Package
5478 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5480 -- A formal package may be a real child package, and not the
5481 -- implicit instance within a parent. In this case the child is
5482 -- not visible and has to be retrieved explicitly as well.
5484 Gen_Par := Inst_Par;
5487 if Present (Gen_Par) then
5489 -- The prefix denotes an instantiation. The entity itself may be a
5490 -- nested generic, or a child unit.
5492 E := Find_Generic_Child (Gen_Par, S);
5495 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5496 Set_Entity (Gen_Id, E);
5497 Set_Etype (Gen_Id, Etype (E));
5499 Set_Etype (S, Etype (E));
5501 -- Indicate that this is a reference to the parent
5503 if In_Extended_Main_Source_Unit (Gen_Id) then
5504 Set_Is_Instantiated (Inst_Par);
5507 -- A common mistake is to replicate the naming scheme of a
5508 -- hierarchy by instantiating a generic child directly, rather
5509 -- than the implicit child in a parent instance:
5511 -- generic .. package Gpar is ..
5512 -- generic .. package Gpar.Child is ..
5513 -- package Par is new Gpar ();
5516 -- package Par.Child is new Gpar.Child ();
5517 -- rather than Par.Child
5519 -- In this case the instantiation is within Par, which is an
5520 -- instance, but Gpar does not denote Par because we are not IN
5521 -- the instance of Gpar, so this is illegal. The test below
5522 -- recognizes this particular case.
5524 if Is_Child_Unit (E)
5525 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5526 and then (not In_Instance
5527 or else Nkind (Parent (Parent (Gen_Id))) =
5531 ("prefix of generic child unit must be instance of parent",
5535 if not In_Open_Scopes (Inst_Par)
5536 and then Nkind (Parent (Gen_Id)) not in
5537 N_Generic_Renaming_Declaration
5539 Install_Parent (Inst_Par);
5540 Parent_Installed := True;
5542 elsif In_Open_Scopes (Inst_Par) then
5544 -- If the parent is already installed, install the actuals
5545 -- for its formal packages. This is necessary when the
5546 -- child instance is a child of the parent instance:
5547 -- in this case, the parent is placed on the scope stack
5548 -- but the formal packages are not made visible.
5550 Install_Formal_Packages (Inst_Par);
5554 -- If the generic parent does not contain an entity that
5555 -- corresponds to the selector, the instance doesn't either.
5556 -- Analyzing the node will yield the appropriate error message.
5557 -- If the entity is not a child unit, then it is an inner
5558 -- generic in the parent.
5566 if Is_Child_Unit (Entity (Gen_Id))
5568 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5569 and then not In_Open_Scopes (Inst_Par)
5571 Install_Parent (Inst_Par);
5572 Parent_Installed := True;
5574 -- The generic unit may be the renaming of the implicit child
5575 -- present in an instance. In that case the parent instance is
5576 -- obtained from the name of the renamed entity.
5578 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
5579 and then Present (Renamed_Entity (Entity (Gen_Id)))
5580 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
5583 Renamed_Package : constant Node_Id :=
5584 Name (Parent (Entity (Gen_Id)));
5586 if Nkind (Renamed_Package) = N_Expanded_Name then
5587 Inst_Par := Entity (Prefix (Renamed_Package));
5588 Install_Parent (Inst_Par);
5589 Parent_Installed := True;
5595 elsif Nkind (Gen_Id) = N_Expanded_Name then
5597 -- Entity already present, analyze prefix, whose meaning may be
5598 -- an instance in the current context. If it is an instance of
5599 -- a relative within another, the proper parent may still have
5600 -- to be installed, if they are not of the same generation.
5602 Analyze (Prefix (Gen_Id));
5604 -- In the unlikely case that a local declaration hides the name
5605 -- of the parent package, locate it on the homonym chain. If the
5606 -- context is an instance of the parent, the renaming entity is
5609 Inst_Par := Entity (Prefix (Gen_Id));
5610 while Present (Inst_Par)
5611 and then not Is_Package_Or_Generic_Package (Inst_Par)
5613 Inst_Par := Homonym (Inst_Par);
5616 pragma Assert (Present (Inst_Par));
5617 Set_Entity (Prefix (Gen_Id), Inst_Par);
5619 if In_Enclosing_Instance then
5622 elsif Present (Entity (Gen_Id))
5623 and then Is_Child_Unit (Entity (Gen_Id))
5624 and then not In_Open_Scopes (Inst_Par)
5626 Install_Parent (Inst_Par);
5627 Parent_Installed := True;
5630 elsif In_Enclosing_Instance then
5632 -- The child unit is found in some enclosing scope
5639 -- If this is the renaming of the implicit child in a parent
5640 -- instance, recover the parent name and install it.
5642 if Is_Entity_Name (Gen_Id) then
5643 E := Entity (Gen_Id);
5645 if Is_Generic_Unit (E)
5646 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5647 and then Is_Child_Unit (Renamed_Object (E))
5648 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5649 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5652 New_Copy_Tree (Name (Parent (E))));
5653 Inst_Par := Entity (Prefix (Gen_Id));
5655 if not In_Open_Scopes (Inst_Par) then
5656 Install_Parent (Inst_Par);
5657 Parent_Installed := True;
5660 -- If it is a child unit of a non-generic parent, it may be
5661 -- use-visible and given by a direct name. Install parent as
5664 elsif Is_Generic_Unit (E)
5665 and then Is_Child_Unit (E)
5667 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5668 and then not Is_Generic_Unit (Scope (E))
5670 if not In_Open_Scopes (Scope (E)) then
5671 Install_Parent (Scope (E));
5672 Parent_Installed := True;
5677 end Check_Generic_Child_Unit;
5679 -----------------------------
5680 -- Check_Hidden_Child_Unit --
5681 -----------------------------
5683 procedure Check_Hidden_Child_Unit
5685 Gen_Unit : Entity_Id;
5686 Act_Decl_Id : Entity_Id)
5688 Gen_Id : constant Node_Id := Name (N);
5691 if Is_Child_Unit (Gen_Unit)
5692 and then Is_Child_Unit (Act_Decl_Id)
5693 and then Nkind (Gen_Id) = N_Expanded_Name
5694 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5695 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5697 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5699 ("generic unit & is implicitly declared in &",
5700 Defining_Unit_Name (N), Gen_Unit);
5701 Error_Msg_N ("\instance must have different name",
5702 Defining_Unit_Name (N));
5704 end Check_Hidden_Child_Unit;
5706 ------------------------
5707 -- Check_Private_View --
5708 ------------------------
5710 procedure Check_Private_View (N : Node_Id) is
5711 T : constant Entity_Id := Etype (N);
5715 -- Exchange views if the type was not private in the generic but is
5716 -- private at the point of instantiation. Do not exchange views if
5717 -- the scope of the type is in scope. This can happen if both generic
5718 -- and instance are sibling units, or if type is defined in a parent.
5719 -- In this case the visibility of the type will be correct for all
5723 BT := Base_Type (T);
5725 if Is_Private_Type (T)
5726 and then not Has_Private_View (N)
5727 and then Present (Full_View (T))
5728 and then not In_Open_Scopes (Scope (T))
5730 -- In the generic, the full type was visible. Save the private
5731 -- entity, for subsequent exchange.
5735 elsif Has_Private_View (N)
5736 and then not Is_Private_Type (T)
5737 and then not Has_Been_Exchanged (T)
5738 and then Etype (Get_Associated_Node (N)) /= T
5740 -- Only the private declaration was visible in the generic. If
5741 -- the type appears in a subtype declaration, the subtype in the
5742 -- instance must have a view compatible with that of its parent,
5743 -- which must be exchanged (see corresponding code in Restore_
5744 -- Private_Views). Otherwise, if the type is defined in a parent
5745 -- unit, leave full visibility within instance, which is safe.
5747 if In_Open_Scopes (Scope (Base_Type (T)))
5748 and then not Is_Private_Type (Base_Type (T))
5749 and then Comes_From_Source (Base_Type (T))
5753 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5754 or else not In_Private_Part (Scope (Base_Type (T)))
5756 Prepend_Elmt (T, Exchanged_Views);
5757 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5760 -- For composite types with inconsistent representation exchange
5761 -- component types accordingly.
5763 elsif Is_Access_Type (T)
5764 and then Is_Private_Type (Designated_Type (T))
5765 and then not Has_Private_View (N)
5766 and then Present (Full_View (Designated_Type (T)))
5768 Switch_View (Designated_Type (T));
5770 elsif Is_Array_Type (T) then
5771 if Is_Private_Type (Component_Type (T))
5772 and then not Has_Private_View (N)
5773 and then Present (Full_View (Component_Type (T)))
5775 Switch_View (Component_Type (T));
5778 -- The normal exchange mechanism relies on the setting of a
5779 -- flag on the reference in the generic. However, an additional
5780 -- mechanism is needed for types that are not explicitly mentioned
5781 -- in the generic, but may be needed in expanded code in the
5782 -- instance. This includes component types of arrays and
5783 -- designated types of access types. This processing must also
5784 -- include the index types of arrays which we take care of here.
5791 Indx := First_Index (T);
5792 Typ := Base_Type (Etype (Indx));
5793 while Present (Indx) loop
5794 if Is_Private_Type (Typ)
5795 and then Present (Full_View (Typ))
5804 elsif Is_Private_Type (T)
5805 and then Present (Full_View (T))
5806 and then Is_Array_Type (Full_View (T))
5807 and then Is_Private_Type (Component_Type (Full_View (T)))
5811 -- Finally, a non-private subtype may have a private base type, which
5812 -- must be exchanged for consistency. This can happen when a package
5813 -- body is instantiated, when the scope stack is empty but in fact
5814 -- the subtype and the base type are declared in an enclosing scope.
5816 -- Note that in this case we introduce an inconsistency in the view
5817 -- set, because we switch the base type BT, but there could be some
5818 -- private dependent subtypes of BT which remain unswitched. Such
5819 -- subtypes might need to be switched at a later point (see specific
5820 -- provision for that case in Switch_View).
5822 elsif not Is_Private_Type (T)
5823 and then not Has_Private_View (N)
5824 and then Is_Private_Type (BT)
5825 and then Present (Full_View (BT))
5826 and then not Is_Generic_Type (BT)
5827 and then not In_Open_Scopes (BT)
5829 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5830 Exchange_Declarations (BT);
5833 end Check_Private_View;
5835 --------------------------
5836 -- Contains_Instance_Of --
5837 --------------------------
5839 function Contains_Instance_Of
5842 N : Node_Id) return Boolean
5850 -- Verify that there are no circular instantiations. We check whether
5851 -- the unit contains an instance of the current scope or some enclosing
5852 -- scope (in case one of the instances appears in a subunit). Longer
5853 -- circularities involving subunits might seem too pathological to
5854 -- consider, but they were not too pathological for the authors of
5855 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5856 -- enclosing generic scopes as containing an instance.
5859 -- Within a generic subprogram body, the scope is not generic, to
5860 -- allow for recursive subprograms. Use the declaration to determine
5861 -- whether this is a generic unit.
5863 if Ekind (Scop) = E_Generic_Package
5864 or else (Is_Subprogram (Scop)
5865 and then Nkind (Unit_Declaration_Node (Scop)) =
5866 N_Generic_Subprogram_Declaration)
5868 Elmt := First_Elmt (Inner_Instances (Inner));
5870 while Present (Elmt) loop
5871 if Node (Elmt) = Scop then
5872 Error_Msg_Node_2 := Inner;
5874 ("circular Instantiation: & instantiated within &!",
5878 elsif Node (Elmt) = Inner then
5881 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5882 Error_Msg_Node_2 := Inner;
5884 ("circular Instantiation: & instantiated within &!",
5892 -- Indicate that Inner is being instantiated within Scop
5894 Append_Elmt (Inner, Inner_Instances (Scop));
5897 if Scop = Standard_Standard then
5900 Scop := Scope (Scop);
5905 end Contains_Instance_Of;
5907 -----------------------
5908 -- Copy_Generic_Node --
5909 -----------------------
5911 function Copy_Generic_Node
5913 Parent_Id : Node_Id;
5914 Instantiating : Boolean) return Node_Id
5919 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5920 -- Check the given value of one of the Fields referenced by the
5921 -- current node to determine whether to copy it recursively. The
5922 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5923 -- value (Sloc, Uint, Char) in which case it need not be copied.
5925 procedure Copy_Descendants;
5926 -- Common utility for various nodes
5928 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5929 -- Make copy of element list
5931 function Copy_Generic_List
5933 Parent_Id : Node_Id) return List_Id;
5934 -- Apply Copy_Node recursively to the members of a node list
5936 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5937 -- True if an identifier is part of the defining program unit name
5938 -- of a child unit. The entity of such an identifier must be kept
5939 -- (for ASIS use) even though as the name of an enclosing generic
5940 -- it would otherwise not be preserved in the generic tree.
5942 ----------------------
5943 -- Copy_Descendants --
5944 ----------------------
5946 procedure Copy_Descendants is
5948 use Atree.Unchecked_Access;
5949 -- This code section is part of the implementation of an untyped
5950 -- tree traversal, so it needs direct access to node fields.
5953 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5954 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5955 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5956 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5957 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5958 end Copy_Descendants;
5960 -----------------------------
5961 -- Copy_Generic_Descendant --
5962 -----------------------------
5964 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5966 if D = Union_Id (Empty) then
5969 elsif D in Node_Range then
5971 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5973 elsif D in List_Range then
5974 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5976 elsif D in Elist_Range then
5977 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5979 -- Nothing else is copyable (e.g. Uint values), return as is
5984 end Copy_Generic_Descendant;
5986 ------------------------
5987 -- Copy_Generic_Elist --
5988 ------------------------
5990 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
5997 M := First_Elmt (E);
5998 while Present (M) loop
6000 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
6009 end Copy_Generic_Elist;
6011 -----------------------
6012 -- Copy_Generic_List --
6013 -----------------------
6015 function Copy_Generic_List
6017 Parent_Id : Node_Id) return List_Id
6025 Set_Parent (New_L, Parent_Id);
6028 while Present (N) loop
6029 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
6038 end Copy_Generic_List;
6040 ---------------------------
6041 -- In_Defining_Unit_Name --
6042 ---------------------------
6044 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
6046 return Present (Parent (Nam))
6047 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
6049 (Nkind (Parent (Nam)) = N_Expanded_Name
6050 and then In_Defining_Unit_Name (Parent (Nam))));
6051 end In_Defining_Unit_Name;
6053 -- Start of processing for Copy_Generic_Node
6060 New_N := New_Copy (N);
6062 -- Copy aspects if present
6064 if Has_Aspects (N) then
6065 Set_Has_Aspects (New_N, False);
6066 Set_Aspect_Specifications
6067 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
6070 if Instantiating then
6071 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
6074 if not Is_List_Member (N) then
6075 Set_Parent (New_N, Parent_Id);
6078 -- If defining identifier, then all fields have been copied already
6080 if Nkind (New_N) in N_Entity then
6083 -- Special casing for identifiers and other entity names and operators
6085 elsif Nkind_In (New_N, N_Identifier,
6086 N_Character_Literal,
6089 or else Nkind (New_N) in N_Op
6091 if not Instantiating then
6093 -- Link both nodes in order to assign subsequently the entity of
6094 -- the copy to the original node, in case this is a global
6097 Set_Associated_Node (N, New_N);
6099 -- If we are within an instantiation, this is a nested generic
6100 -- that has already been analyzed at the point of definition. We
6101 -- must preserve references that were global to the enclosing
6102 -- parent at that point. Other occurrences, whether global or
6103 -- local to the current generic, must be resolved anew, so we
6104 -- reset the entity in the generic copy. A global reference has a
6105 -- smaller depth than the parent, or else the same depth in case
6106 -- both are distinct compilation units.
6107 -- A child unit is implicitly declared within the enclosing parent
6108 -- but is in fact global to it, and must be preserved.
6110 -- It is also possible for Current_Instantiated_Parent to be
6111 -- defined, and for this not to be a nested generic, namely if the
6112 -- unit is loaded through Rtsfind. In that case, the entity of
6113 -- New_N is only a link to the associated node, and not a defining
6116 -- The entities for parent units in the defining_program_unit of a
6117 -- generic child unit are established when the context of the unit
6118 -- is first analyzed, before the generic copy is made. They are
6119 -- preserved in the copy for use in ASIS queries.
6121 Ent := Entity (New_N);
6123 if No (Current_Instantiated_Parent.Gen_Id) then
6125 or else Nkind (Ent) /= N_Defining_Identifier
6126 or else not In_Defining_Unit_Name (N)
6128 Set_Associated_Node (New_N, Empty);
6133 not Nkind_In (Ent, N_Defining_Identifier,
6134 N_Defining_Character_Literal,
6135 N_Defining_Operator_Symbol)
6136 or else No (Scope (Ent))
6138 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
6139 and then not Is_Child_Unit (Ent))
6141 (Scope_Depth (Scope (Ent)) >
6142 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
6144 Get_Source_Unit (Ent) =
6145 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
6147 Set_Associated_Node (New_N, Empty);
6150 -- Case of instantiating identifier or some other name or operator
6153 -- If the associated node is still defined, the entity in it is
6154 -- global, and must be copied to the instance. If this copy is
6155 -- being made for a body to inline, it is applied to an
6156 -- instantiated tree, and the entity is already present and must
6157 -- be also preserved.
6160 Assoc : constant Node_Id := Get_Associated_Node (N);
6163 if Present (Assoc) then
6164 if Nkind (Assoc) = Nkind (N) then
6165 Set_Entity (New_N, Entity (Assoc));
6166 Check_Private_View (N);
6168 elsif Nkind (Assoc) = N_Function_Call then
6169 Set_Entity (New_N, Entity (Name (Assoc)));
6171 elsif Nkind_In (Assoc, N_Defining_Identifier,
6172 N_Defining_Character_Literal,
6173 N_Defining_Operator_Symbol)
6174 and then Expander_Active
6176 -- Inlining case: we are copying a tree that contains
6177 -- global entities, which are preserved in the copy to be
6178 -- used for subsequent inlining.
6183 Set_Entity (New_N, Empty);
6189 -- For expanded name, we must copy the Prefix and Selector_Name
6191 if Nkind (N) = N_Expanded_Name then
6193 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
6195 Set_Selector_Name (New_N,
6196 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
6198 -- For operators, we must copy the right operand
6200 elsif Nkind (N) in N_Op then
6201 Set_Right_Opnd (New_N,
6202 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
6204 -- And for binary operators, the left operand as well
6206 if Nkind (N) in N_Binary_Op then
6207 Set_Left_Opnd (New_N,
6208 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
6212 -- Special casing for stubs
6214 elsif Nkind (N) in N_Body_Stub then
6216 -- In any case, we must copy the specification or defining
6217 -- identifier as appropriate.
6219 if Nkind (N) = N_Subprogram_Body_Stub then
6220 Set_Specification (New_N,
6221 Copy_Generic_Node (Specification (N), New_N, Instantiating));
6224 Set_Defining_Identifier (New_N,
6226 (Defining_Identifier (N), New_N, Instantiating));
6229 -- If we are not instantiating, then this is where we load and
6230 -- analyze subunits, i.e. at the point where the stub occurs. A
6231 -- more permissive system might defer this analysis to the point
6232 -- of instantiation, but this seems to complicated for now.
6234 if not Instantiating then
6236 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
6238 Unum : Unit_Number_Type;
6242 -- Make sure that, if it is a subunit of the main unit that is
6243 -- preprocessed and if -gnateG is specified, the preprocessed
6244 -- file will be written.
6246 Lib.Analysing_Subunit_Of_Main :=
6247 Lib.In_Extended_Main_Source_Unit (N);
6250 (Load_Name => Subunit_Name,
6254 Lib.Analysing_Subunit_Of_Main := False;
6256 -- If the proper body is not found, a warning message will be
6257 -- emitted when analyzing the stub, or later at the point
6258 -- of instantiation. Here we just leave the stub as is.
6260 if Unum = No_Unit then
6261 Subunits_Missing := True;
6262 goto Subunit_Not_Found;
6265 Subunit := Cunit (Unum);
6267 if Nkind (Unit (Subunit)) /= N_Subunit then
6269 ("found child unit instead of expected SEPARATE subunit",
6271 Error_Msg_Sloc := Sloc (N);
6272 Error_Msg_N ("\to complete stub #", Subunit);
6273 goto Subunit_Not_Found;
6276 -- We must create a generic copy of the subunit, in order to
6277 -- perform semantic analysis on it, and we must replace the
6278 -- stub in the original generic unit with the subunit, in order
6279 -- to preserve non-local references within.
6281 -- Only the proper body needs to be copied. Library_Unit and
6282 -- context clause are simply inherited by the generic copy.
6283 -- Note that the copy (which may be recursive if there are
6284 -- nested subunits) must be done first, before attaching it to
6285 -- the enclosing generic.
6289 (Proper_Body (Unit (Subunit)),
6290 Empty, Instantiating => False);
6292 -- Now place the original proper body in the original generic
6293 -- unit. This is a body, not a compilation unit.
6295 Rewrite (N, Proper_Body (Unit (Subunit)));
6296 Set_Is_Compilation_Unit (Defining_Entity (N), False);
6297 Set_Was_Originally_Stub (N);
6299 -- Finally replace the body of the subunit with its copy, and
6300 -- make this new subunit into the library unit of the generic
6301 -- copy, which does not have stubs any longer.
6303 Set_Proper_Body (Unit (Subunit), New_Body);
6304 Set_Library_Unit (New_N, Subunit);
6305 Inherit_Context (Unit (Subunit), N);
6308 -- If we are instantiating, this must be an error case, since
6309 -- otherwise we would have replaced the stub node by the proper body
6310 -- that corresponds. So just ignore it in the copy (i.e. we have
6311 -- copied it, and that is good enough).
6317 <<Subunit_Not_Found>> null;
6319 -- If the node is a compilation unit, it is the subunit of a stub, which
6320 -- has been loaded already (see code below). In this case, the library
6321 -- unit field of N points to the parent unit (which is a compilation
6322 -- unit) and need not (and cannot!) be copied.
6324 -- When the proper body of the stub is analyzed, the library_unit link
6325 -- is used to establish the proper context (see sem_ch10).
6327 -- The other fields of a compilation unit are copied as usual
6329 elsif Nkind (N) = N_Compilation_Unit then
6331 -- This code can only be executed when not instantiating, because in
6332 -- the copy made for an instantiation, the compilation unit node has
6333 -- disappeared at the point that a stub is replaced by its proper
6336 pragma Assert (not Instantiating);
6338 Set_Context_Items (New_N,
6339 Copy_Generic_List (Context_Items (N), New_N));
6342 Copy_Generic_Node (Unit (N), New_N, False));
6344 Set_First_Inlined_Subprogram (New_N,
6346 (First_Inlined_Subprogram (N), New_N, False));
6348 Set_Aux_Decls_Node (New_N,
6349 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6351 -- For an assignment node, the assignment is known to be semantically
6352 -- legal if we are instantiating the template. This avoids incorrect
6353 -- diagnostics in generated code.
6355 elsif Nkind (N) = N_Assignment_Statement then
6357 -- Copy name and expression fields in usual manner
6360 Copy_Generic_Node (Name (N), New_N, Instantiating));
6362 Set_Expression (New_N,
6363 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6365 if Instantiating then
6366 Set_Assignment_OK (Name (New_N), True);
6369 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6370 if not Instantiating then
6371 Set_Associated_Node (N, New_N);
6374 if Present (Get_Associated_Node (N))
6375 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6377 -- In the generic the aggregate has some composite type. If at
6378 -- the point of instantiation the type has a private view,
6379 -- install the full view (and that of its ancestors, if any).
6382 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6387 and then Is_Private_Type (T)
6393 and then Is_Tagged_Type (T)
6394 and then Is_Derived_Type (T)
6396 Rt := Root_Type (T);
6401 if Is_Private_Type (T) then
6412 -- Do not copy the associated node, which points to the generic copy
6413 -- of the aggregate.
6416 use Atree.Unchecked_Access;
6417 -- This code section is part of the implementation of an untyped
6418 -- tree traversal, so it needs direct access to node fields.
6421 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6422 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6423 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6424 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6427 -- Allocators do not have an identifier denoting the access type, so we
6428 -- must locate it through the expression to check whether the views are
6431 elsif Nkind (N) = N_Allocator
6432 and then Nkind (Expression (N)) = N_Qualified_Expression
6433 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6434 and then Instantiating
6437 T : constant Node_Id :=
6438 Get_Associated_Node (Subtype_Mark (Expression (N)));
6444 -- Retrieve the allocator node in the generic copy
6446 Acc_T := Etype (Parent (Parent (T)));
6448 and then Is_Private_Type (Acc_T)
6450 Switch_View (Acc_T);
6457 -- For a proper body, we must catch the case of a proper body that
6458 -- replaces a stub. This represents the point at which a separate
6459 -- compilation unit, and hence template file, may be referenced, so we
6460 -- must make a new source instantiation entry for the template of the
6461 -- subunit, and ensure that all nodes in the subunit are adjusted using
6462 -- this new source instantiation entry.
6464 elsif Nkind (N) in N_Proper_Body then
6466 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6469 if Instantiating and then Was_Originally_Stub (N) then
6470 Create_Instantiation_Source
6471 (Instantiation_Node,
6472 Defining_Entity (N),
6477 -- Now copy the fields of the proper body, using the new
6478 -- adjustment factor if one was needed as per test above.
6482 -- Restore the original adjustment factor in case changed
6484 S_Adjustment := Save_Adjustment;
6487 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6488 -- generic unit, not to the instantiating unit.
6490 elsif Nkind (N) = N_Pragma and then Instantiating then
6492 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6494 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then
6495 New_N := Make_Null_Statement (Sloc (N));
6502 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
6504 -- No descendant fields need traversing
6508 elsif Nkind (N) = N_String_Literal
6509 and then Present (Etype (N))
6510 and then Instantiating
6512 -- If the string is declared in an outer scope, the string_literal
6513 -- subtype created for it may have the wrong scope. We force the
6514 -- reanalysis of the constant to generate a new itype in the proper
6517 Set_Etype (New_N, Empty);
6518 Set_Analyzed (New_N, False);
6520 -- For the remaining nodes, copy their descendants recursively
6525 if Instantiating and then Nkind (N) = N_Subprogram_Body then
6526 Set_Generic_Parent (Specification (New_N), N);
6528 -- Should preserve Corresponding_Spec??? (12.3(14))
6533 end Copy_Generic_Node;
6535 ----------------------------
6536 -- Denotes_Formal_Package --
6537 ----------------------------
6539 function Denotes_Formal_Package
6541 On_Exit : Boolean := False;
6542 Instance : Entity_Id := Empty) return Boolean
6545 Scop : constant Entity_Id := Scope (Pack);
6548 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6549 -- The package in question may be an actual for a previous formal
6550 -- package P of the current instance, so examine its actuals as well.
6551 -- This must be recursive over other formal packages.
6553 ----------------------------------
6554 -- Is_Actual_Of_Previous_Formal --
6555 ----------------------------------
6557 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6561 E1 := First_Entity (P);
6562 while Present (E1) and then E1 /= Instance loop
6563 if Ekind (E1) = E_Package
6564 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6566 if Renamed_Object (E1) = Pack then
6569 elsif E1 = P or else Renamed_Object (E1) = P then
6572 elsif Is_Actual_Of_Previous_Formal (E1) then
6581 end Is_Actual_Of_Previous_Formal;
6583 -- Start of processing for Denotes_Formal_Package
6589 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6591 Par := Current_Instantiated_Parent.Act_Id;
6594 if Ekind (Scop) = E_Generic_Package
6595 or else Nkind (Unit_Declaration_Node (Scop)) =
6596 N_Generic_Subprogram_Declaration
6600 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6601 N_Formal_Package_Declaration
6609 -- Check whether this package is associated with a formal package of
6610 -- the enclosing instantiation. Iterate over the list of renamings.
6612 E := First_Entity (Par);
6613 while Present (E) loop
6614 if Ekind (E) /= E_Package
6615 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6619 elsif Renamed_Object (E) = Par then
6622 elsif Renamed_Object (E) = Pack then
6625 elsif Is_Actual_Of_Previous_Formal (E) then
6635 end Denotes_Formal_Package;
6641 procedure End_Generic is
6643 -- ??? More things could be factored out in this routine. Should
6644 -- probably be done at a later stage.
6646 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6647 Generic_Flags.Decrement_Last;
6649 Expander_Mode_Restore;
6652 ----------------------
6653 -- Find_Actual_Type --
6654 ----------------------
6656 function Find_Actual_Type
6658 Gen_Type : Entity_Id) return Entity_Id
6660 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
6664 -- Special processing only applies to child units
6666 if not Is_Child_Unit (Gen_Scope) then
6667 return Get_Instance_Of (Typ);
6669 -- If designated or component type is itself a formal of the child unit,
6670 -- its instance is available.
6672 elsif Scope (Typ) = Gen_Scope then
6673 return Get_Instance_Of (Typ);
6675 -- If the array or access type is not declared in the parent unit,
6676 -- no special processing needed.
6678 elsif not Is_Generic_Type (Typ)
6679 and then Scope (Gen_Scope) /= Scope (Typ)
6681 return Get_Instance_Of (Typ);
6683 -- Otherwise, retrieve designated or component type by visibility
6686 T := Current_Entity (Typ);
6687 while Present (T) loop
6688 if In_Open_Scopes (Scope (T)) then
6691 elsif Is_Generic_Actual_Type (T) then
6700 end Find_Actual_Type;
6702 ----------------------------
6703 -- Freeze_Subprogram_Body --
6704 ----------------------------
6706 procedure Freeze_Subprogram_Body
6707 (Inst_Node : Node_Id;
6709 Pack_Id : Entity_Id)
6711 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6712 Par : constant Entity_Id := Scope (Gen_Unit);
6718 function Earlier (N1, N2 : Node_Id) return Boolean;
6719 -- Yields True if N1 and N2 appear in the same compilation unit,
6720 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6721 -- traversal of the tree for the unit.
6723 function Enclosing_Body (N : Node_Id) return Node_Id;
6724 -- Find innermost package body that encloses the given node, and which
6725 -- is not a compilation unit. Freeze nodes for the instance, or for its
6726 -- enclosing body, may be inserted after the enclosing_body of the
6729 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6730 -- Find entity for given package body, and locate or create a freeze
6733 function True_Parent (N : Node_Id) return Node_Id;
6734 -- For a subunit, return parent of corresponding stub
6740 function Earlier (N1, N2 : Node_Id) return Boolean is
6746 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6747 -- Find distance from given node to enclosing compilation unit
6753 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6756 and then Nkind (P) /= N_Compilation_Unit
6758 P := True_Parent (P);
6763 -- Start of processing for Earlier
6766 Find_Depth (P1, D1);
6767 Find_Depth (P2, D2);
6777 P1 := True_Parent (P1);
6782 P2 := True_Parent (P2);
6786 -- At this point P1 and P2 are at the same distance from the root.
6787 -- We examine their parents until we find a common declarative list,
6788 -- at which point we can establish their relative placement by
6789 -- comparing their ultimate slocs. If we reach the root, N1 and N2
6790 -- do not descend from the same declarative list (e.g. one is nested
6791 -- in the declarative part and the other is in a block in the
6792 -- statement part) and the earlier one is already frozen.
6794 while not Is_List_Member (P1)
6795 or else not Is_List_Member (P2)
6796 or else List_Containing (P1) /= List_Containing (P2)
6798 P1 := True_Parent (P1);
6799 P2 := True_Parent (P2);
6801 if Nkind (Parent (P1)) = N_Subunit then
6802 P1 := Corresponding_Stub (Parent (P1));
6805 if Nkind (Parent (P2)) = N_Subunit then
6806 P2 := Corresponding_Stub (Parent (P2));
6815 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6818 --------------------
6819 -- Enclosing_Body --
6820 --------------------
6822 function Enclosing_Body (N : Node_Id) return Node_Id is
6823 P : Node_Id := Parent (N);
6827 and then Nkind (Parent (P)) /= N_Compilation_Unit
6829 if Nkind (P) = N_Package_Body then
6831 if Nkind (Parent (P)) = N_Subunit then
6832 return Corresponding_Stub (Parent (P));
6838 P := True_Parent (P);
6844 -------------------------
6845 -- Package_Freeze_Node --
6846 -------------------------
6848 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6852 if Nkind (B) = N_Package_Body then
6853 Id := Corresponding_Spec (B);
6855 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6856 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6859 Ensure_Freeze_Node (Id);
6860 return Freeze_Node (Id);
6861 end Package_Freeze_Node;
6867 function True_Parent (N : Node_Id) return Node_Id is
6869 if Nkind (Parent (N)) = N_Subunit then
6870 return Parent (Corresponding_Stub (Parent (N)));
6876 -- Start of processing of Freeze_Subprogram_Body
6879 -- If the instance and the generic body appear within the same unit, and
6880 -- the instance precedes the generic, the freeze node for the instance
6881 -- must appear after that of the generic. If the generic is nested
6882 -- within another instance I2, then current instance must be frozen
6883 -- after I2. In both cases, the freeze nodes are those of enclosing
6884 -- packages. Otherwise, the freeze node is placed at the end of the
6885 -- current declarative part.
6887 Enc_G := Enclosing_Body (Gen_Body);
6888 Enc_I := Enclosing_Body (Inst_Node);
6889 Ensure_Freeze_Node (Pack_Id);
6890 F_Node := Freeze_Node (Pack_Id);
6892 if Is_Generic_Instance (Par)
6893 and then Present (Freeze_Node (Par))
6894 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6896 -- The parent was a premature instantiation. Insert freeze node at
6897 -- the end the current declarative part.
6899 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6900 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6902 -- Handle the following case:
6904 -- package Parent_Inst is new ...
6907 -- procedure P ... -- this body freezes Parent_Inst
6909 -- package Inst is new ...
6911 -- In this particular scenario, the freeze node for Inst must be
6912 -- inserted in the same manner as that of Parent_Inst - before the
6913 -- next source body or at the end of the declarative list (body not
6914 -- available). If body P did not exist and Parent_Inst was frozen
6915 -- after Inst, either by a body following Inst or at the end of the
6916 -- declarative region, the freeze node for Inst must be inserted
6917 -- after that of Parent_Inst. This relation is established by
6918 -- comparing the Slocs of Parent_Inst freeze node and Inst.
6920 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
6921 List_Containing (Inst_Node)
6922 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
6924 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6927 Insert_After (Freeze_Node (Par), F_Node);
6930 -- The body enclosing the instance should be frozen after the body that
6931 -- includes the generic, because the body of the instance may make
6932 -- references to entities therein. If the two are not in the same
6933 -- declarative part, or if the one enclosing the instance is frozen
6934 -- already, freeze the instance at the end of the current declarative
6937 elsif Is_Generic_Instance (Par)
6938 and then Present (Freeze_Node (Par))
6939 and then Present (Enc_I)
6941 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6943 (Nkind (Enc_I) = N_Package_Body
6945 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6947 -- The enclosing package may contain several instances. Rather
6948 -- than computing the earliest point at which to insert its freeze
6949 -- node, we place it at the end of the declarative part of the
6950 -- parent of the generic.
6952 Insert_Freeze_Node_For_Instance
6953 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6956 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
6958 elsif Present (Enc_G)
6959 and then Present (Enc_I)
6960 and then Enc_G /= Enc_I
6961 and then Earlier (Inst_Node, Gen_Body)
6963 if Nkind (Enc_G) = N_Package_Body then
6964 E_G_Id := Corresponding_Spec (Enc_G);
6965 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6967 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6970 -- Freeze package that encloses instance, and place node after
6971 -- package that encloses generic. If enclosing package is already
6972 -- frozen we have to assume it is at the proper place. This may be a
6973 -- potential ABE that requires dynamic checking. Do not add a freeze
6974 -- node if the package that encloses the generic is inside the body
6975 -- that encloses the instance, because the freeze node would be in
6976 -- the wrong scope. Additional contortions needed if the bodies are
6977 -- within a subunit.
6980 Enclosing_Body : Node_Id;
6983 if Nkind (Enc_I) = N_Package_Body_Stub then
6984 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
6986 Enclosing_Body := Enc_I;
6989 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
6990 Insert_Freeze_Node_For_Instance
6991 (Enc_G, Package_Freeze_Node (Enc_I));
6995 -- Freeze enclosing subunit before instance
6997 Ensure_Freeze_Node (E_G_Id);
6999 if not Is_List_Member (Freeze_Node (E_G_Id)) then
7000 Insert_After (Enc_G, Freeze_Node (E_G_Id));
7003 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7006 -- If none of the above, insert freeze node at the end of the current
7007 -- declarative part.
7009 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
7011 end Freeze_Subprogram_Body;
7017 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
7019 return Generic_Renamings.Table (E).Gen_Id;
7022 ---------------------
7023 -- Get_Instance_Of --
7024 ---------------------
7026 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
7027 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
7030 if Res /= Assoc_Null then
7031 return Generic_Renamings.Table (Res).Act_Id;
7033 -- On exit, entity is not instantiated: not a generic parameter, or
7034 -- else parameter of an inner generic unit.
7038 end Get_Instance_Of;
7040 ------------------------------------
7041 -- Get_Package_Instantiation_Node --
7042 ------------------------------------
7044 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
7045 Decl : Node_Id := Unit_Declaration_Node (A);
7049 -- If the Package_Instantiation attribute has been set on the package
7050 -- entity, then use it directly when it (or its Original_Node) refers
7051 -- to an N_Package_Instantiation node. In principle it should be
7052 -- possible to have this field set in all cases, which should be
7053 -- investigated, and would allow this function to be significantly
7056 Inst := Package_Instantiation (A);
7058 if Present (Inst) then
7059 if Nkind (Inst) = N_Package_Instantiation then
7062 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
7063 return Original_Node (Inst);
7067 -- If the instantiation is a compilation unit that does not need body
7068 -- then the instantiation node has been rewritten as a package
7069 -- declaration for the instance, and we return the original node.
7071 -- If it is a compilation unit and the instance node has not been
7072 -- rewritten, then it is still the unit of the compilation. Finally, if
7073 -- a body is present, this is a parent of the main unit whose body has
7074 -- been compiled for inlining purposes, and the instantiation node has
7075 -- been rewritten with the instance body.
7077 -- Otherwise the instantiation node appears after the declaration. If
7078 -- the entity is a formal package, the declaration may have been
7079 -- rewritten as a generic declaration (in the case of a formal with box)
7080 -- or left as a formal package declaration if it has actuals, and is
7081 -- found with a forward search.
7083 if Nkind (Parent (Decl)) = N_Compilation_Unit then
7084 if Nkind (Decl) = N_Package_Declaration
7085 and then Present (Corresponding_Body (Decl))
7087 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
7090 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
7091 return Original_Node (Decl);
7093 return Unit (Parent (Decl));
7096 elsif Nkind (Decl) = N_Package_Declaration
7097 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
7099 return Original_Node (Decl);
7102 Inst := Next (Decl);
7103 while not Nkind_In (Inst, N_Package_Instantiation,
7104 N_Formal_Package_Declaration)
7111 end Get_Package_Instantiation_Node;
7113 ------------------------
7114 -- Has_Been_Exchanged --
7115 ------------------------
7117 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
7121 Next := First_Elmt (Exchanged_Views);
7122 while Present (Next) loop
7123 if Full_View (Node (Next)) = E then
7131 end Has_Been_Exchanged;
7137 function Hash (F : Entity_Id) return HTable_Range is
7139 return HTable_Range (F mod HTable_Size);
7142 ------------------------
7143 -- Hide_Current_Scope --
7144 ------------------------
7146 procedure Hide_Current_Scope is
7147 C : constant Entity_Id := Current_Scope;
7151 Set_Is_Hidden_Open_Scope (C);
7153 E := First_Entity (C);
7154 while Present (E) loop
7155 if Is_Immediately_Visible (E) then
7156 Set_Is_Immediately_Visible (E, False);
7157 Append_Elmt (E, Hidden_Entities);
7163 -- Make the scope name invisible as well. This is necessary, but might
7164 -- conflict with calls to Rtsfind later on, in case the scope is a
7165 -- predefined one. There is no clean solution to this problem, so for
7166 -- now we depend on the user not redefining Standard itself in one of
7167 -- the parent units.
7169 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
7170 Set_Is_Immediately_Visible (C, False);
7171 Append_Elmt (C, Hidden_Entities);
7174 end Hide_Current_Scope;
7180 procedure Init_Env is
7181 Saved : Instance_Env;
7184 Saved.Instantiated_Parent := Current_Instantiated_Parent;
7185 Saved.Exchanged_Views := Exchanged_Views;
7186 Saved.Hidden_Entities := Hidden_Entities;
7187 Saved.Current_Sem_Unit := Current_Sem_Unit;
7188 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
7189 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
7191 -- Save configuration switches. These may be reset if the unit is a
7192 -- predefined unit, and the current mode is not Ada 2005.
7194 Save_Opt_Config_Switches (Saved.Switches);
7196 Instance_Envs.Append (Saved);
7198 Exchanged_Views := New_Elmt_List;
7199 Hidden_Entities := New_Elmt_List;
7201 -- Make dummy entry for Instantiated parent. If generic unit is legal,
7202 -- this is set properly in Set_Instance_Env.
7204 Current_Instantiated_Parent :=
7205 (Current_Scope, Current_Scope, Assoc_Null);
7208 ------------------------------
7209 -- In_Same_Declarative_Part --
7210 ------------------------------
7212 function In_Same_Declarative_Part
7214 Inst : Node_Id) return Boolean
7216 Decls : constant Node_Id := Parent (F_Node);
7217 Nod : Node_Id := Parent (Inst);
7220 while Present (Nod) loop
7224 elsif Nkind_In (Nod, N_Subprogram_Body,
7232 elsif Nkind (Nod) = N_Subunit then
7233 Nod := Corresponding_Stub (Nod);
7235 elsif Nkind (Nod) = N_Compilation_Unit then
7239 Nod := Parent (Nod);
7244 end In_Same_Declarative_Part;
7246 ---------------------
7247 -- In_Main_Context --
7248 ---------------------
7250 function In_Main_Context (E : Entity_Id) return Boolean is
7256 if not Is_Compilation_Unit (E)
7257 or else Ekind (E) /= E_Package
7258 or else In_Private_Part (E)
7263 Context := Context_Items (Cunit (Main_Unit));
7265 Clause := First (Context);
7266 while Present (Clause) loop
7267 if Nkind (Clause) = N_With_Clause then
7268 Nam := Name (Clause);
7270 -- If the current scope is part of the context of the main unit,
7271 -- analysis of the corresponding with_clause is not complete, and
7272 -- the entity is not set. We use the Chars field directly, which
7273 -- might produce false positives in rare cases, but guarantees
7274 -- that we produce all the instance bodies we will need.
7276 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
7277 or else (Nkind (Nam) = N_Selected_Component
7278 and then Chars (Selector_Name (Nam)) = Chars (E))
7288 end In_Main_Context;
7290 ---------------------
7291 -- Inherit_Context --
7292 ---------------------
7294 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
7295 Current_Context : List_Id;
7296 Current_Unit : Node_Id;
7301 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
7303 -- The inherited context is attached to the enclosing compilation
7304 -- unit. This is either the main unit, or the declaration for the
7305 -- main unit (in case the instantiation appears within the package
7306 -- declaration and the main unit is its body).
7308 Current_Unit := Parent (Inst);
7309 while Present (Current_Unit)
7310 and then Nkind (Current_Unit) /= N_Compilation_Unit
7312 Current_Unit := Parent (Current_Unit);
7315 Current_Context := Context_Items (Current_Unit);
7317 Item := First (Context_Items (Parent (Gen_Decl)));
7318 while Present (Item) loop
7319 if Nkind (Item) = N_With_Clause then
7321 -- Take care to prevent direct cyclic with's, which can happen
7322 -- if the generic body with's the current unit. Such a case
7323 -- would result in binder errors (or run-time errors if the
7324 -- -gnatE switch is in effect), but we want to prevent it here,
7325 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7326 -- that we don't bother to detect indirect cycles.
7328 if Library_Unit (Item) /= Current_Unit then
7329 New_I := New_Copy (Item);
7330 Set_Implicit_With (New_I, True);
7331 Append (New_I, Current_Context);
7338 end Inherit_Context;
7344 procedure Initialize is
7346 Generic_Renamings.Init;
7349 Generic_Renamings_HTable.Reset;
7350 Circularity_Detected := False;
7351 Exchanged_Views := No_Elist;
7352 Hidden_Entities := No_Elist;
7355 -------------------------------------
7356 -- Insert_Freeze_Node_For_Instance --
7357 -------------------------------------
7359 procedure Insert_Freeze_Node_For_Instance
7363 Inst : constant Entity_Id := Entity (F_Node);
7369 if not Is_List_Member (F_Node) then
7370 Decls := List_Containing (N);
7371 Par_N := Parent (Decls);
7374 -- When the instantiation occurs in a package declaration, append the
7375 -- freeze node to the private declarations (if any).
7377 if Nkind (Par_N) = N_Package_Specification
7378 and then Decls = Visible_Declarations (Par_N)
7379 and then Present (Private_Declarations (Par_N))
7380 and then not Is_Empty_List (Private_Declarations (Par_N))
7382 Decls := Private_Declarations (Par_N);
7383 Decl := First (Decls);
7386 -- Determine the proper freeze point of a package instantiation. We
7387 -- adhere to the general rule of a package or subprogram body causing
7388 -- freezing of anything before it in the same declarative region. In
7389 -- this case, the proper freeze point of a package instantiation is
7390 -- before the first source body which follows. This ensures that
7391 -- entities coming from the instance are already frozen and usable
7392 -- in source bodies.
7394 if Nkind (Par_N) /= N_Package_Declaration
7395 and then Ekind (Inst) = E_Package
7396 and then Is_Generic_Instance (Inst)
7398 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
7400 while Present (Decl) loop
7401 if Nkind_In (Decl, N_Package_Body, N_Subprogram_Body)
7402 and then Comes_From_Source (Decl)
7404 Insert_Before (Decl, F_Node);
7412 -- In a package declaration, or if no previous body, insert at end
7415 Insert_After (Last (Decls), F_Node);
7417 end Insert_Freeze_Node_For_Instance;
7423 procedure Install_Body
7424 (Act_Body : Node_Id;
7429 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
7430 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
7431 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
7432 Par : constant Entity_Id := Scope (Gen_Id);
7433 Gen_Unit : constant Node_Id :=
7434 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
7435 Orig_Body : Node_Id := Gen_Body;
7437 Body_Unit : Node_Id;
7439 Must_Delay : Boolean;
7441 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
7442 -- Find subprogram (if any) that encloses instance and/or generic body
7444 function True_Sloc (N : Node_Id) return Source_Ptr;
7445 -- If the instance is nested inside a generic unit, the Sloc of the
7446 -- instance indicates the place of the original definition, not the
7447 -- point of the current enclosing instance. Pending a better usage of
7448 -- Slocs to indicate instantiation places, we determine the place of
7449 -- origin of a node by finding the maximum sloc of any ancestor node.
7450 -- Why is this not equivalent to Top_Level_Location ???
7452 --------------------
7453 -- Enclosing_Subp --
7454 --------------------
7456 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
7457 Scop : Entity_Id := Scope (Id);
7460 while Scop /= Standard_Standard
7461 and then not Is_Overloadable (Scop)
7463 Scop := Scope (Scop);
7473 function True_Sloc (N : Node_Id) return Source_Ptr is
7480 while Present (N1) and then N1 /= Act_Unit loop
7481 if Sloc (N1) > Res then
7491 -- Start of processing for Install_Body
7495 -- If the body is a subunit, the freeze point is the corresponding stub
7496 -- in the current compilation, not the subunit itself.
7498 if Nkind (Parent (Gen_Body)) = N_Subunit then
7499 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
7501 Orig_Body := Gen_Body;
7504 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
7506 -- If the instantiation and the generic definition appear in the same
7507 -- package declaration, this is an early instantiation. If they appear
7508 -- in the same declarative part, it is an early instantiation only if
7509 -- the generic body appears textually later, and the generic body is
7510 -- also in the main unit.
7512 -- If instance is nested within a subprogram, and the generic body is
7513 -- not, the instance is delayed because the enclosing body is. If
7514 -- instance and body are within the same scope, or the same sub-
7515 -- program body, indicate explicitly that the instance is delayed.
7518 (Gen_Unit = Act_Unit
7519 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
7520 N_Generic_Package_Declaration)
7521 or else (Gen_Unit = Body_Unit
7522 and then True_Sloc (N) < Sloc (Orig_Body)))
7523 and then Is_In_Main_Unit (Gen_Unit)
7524 and then (Scope (Act_Id) = Scope (Gen_Id)
7526 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
7528 -- If this is an early instantiation, the freeze node is placed after
7529 -- the generic body. Otherwise, if the generic appears in an instance,
7530 -- we cannot freeze the current instance until the outer one is frozen.
7531 -- This is only relevant if the current instance is nested within some
7532 -- inner scope not itself within the outer instance. If this scope is
7533 -- a package body in the same declarative part as the outer instance,
7534 -- then that body needs to be frozen after the outer instance. Finally,
7535 -- if no delay is needed, we place the freeze node at the end of the
7536 -- current declarative part.
7538 if Expander_Active then
7539 Ensure_Freeze_Node (Act_Id);
7540 F_Node := Freeze_Node (Act_Id);
7543 Insert_After (Orig_Body, F_Node);
7545 elsif Is_Generic_Instance (Par)
7546 and then Present (Freeze_Node (Par))
7547 and then Scope (Act_Id) /= Par
7549 -- Freeze instance of inner generic after instance of enclosing
7552 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
7554 -- Handle the following case:
7556 -- package Parent_Inst is new ...
7559 -- procedure P ... -- this body freezes Parent_Inst
7561 -- package Inst is new ...
7563 -- In this particular scenario, the freeze node for Inst must
7564 -- be inserted in the same manner as that of Parent_Inst -
7565 -- before the next source body or at the end of the declarative
7566 -- list (body not available). If body P did not exist and
7567 -- Parent_Inst was frozen after Inst, either by a body
7568 -- following Inst or at the end of the declarative region, the
7569 -- freeze node for Inst must be inserted after that of
7570 -- Parent_Inst. This relation is established by comparing the
7571 -- Slocs of Parent_Inst freeze node and Inst.
7573 if List_Containing (Get_Package_Instantiation_Node (Par)) =
7575 and then Sloc (Freeze_Node (Par)) < Sloc (N)
7577 Insert_Freeze_Node_For_Instance (N, F_Node);
7579 Insert_After (Freeze_Node (Par), F_Node);
7582 -- Freeze package enclosing instance of inner generic after
7583 -- instance of enclosing generic.
7585 elsif Nkind (Parent (N)) = N_Package_Body
7586 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
7589 Enclosing : constant Entity_Id :=
7590 Corresponding_Spec (Parent (N));
7593 Insert_Freeze_Node_For_Instance (N, F_Node);
7594 Ensure_Freeze_Node (Enclosing);
7596 if not Is_List_Member (Freeze_Node (Enclosing)) then
7598 -- The enclosing context is a subunit, insert the freeze
7599 -- node after the stub.
7601 if Nkind (Parent (Parent (N))) = N_Subunit then
7602 Insert_Freeze_Node_For_Instance
7603 (Corresponding_Stub (Parent (Parent (N))),
7604 Freeze_Node (Enclosing));
7606 -- The parent instance has been frozen before the body of
7607 -- the enclosing package, insert the freeze node after
7610 elsif List_Containing (Freeze_Node (Par)) =
7611 List_Containing (Parent (N))
7612 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
7614 Insert_Freeze_Node_For_Instance
7615 (Parent (N), Freeze_Node (Enclosing));
7619 (Freeze_Node (Par), Freeze_Node (Enclosing));
7625 Insert_Freeze_Node_For_Instance (N, F_Node);
7629 Insert_Freeze_Node_For_Instance (N, F_Node);
7633 Set_Is_Frozen (Act_Id);
7634 Insert_Before (N, Act_Body);
7635 Mark_Rewrite_Insertion (Act_Body);
7638 -----------------------------
7639 -- Install_Formal_Packages --
7640 -----------------------------
7642 procedure Install_Formal_Packages (Par : Entity_Id) is
7645 Gen_E : Entity_Id := Empty;
7648 E := First_Entity (Par);
7650 -- In we are installing an instance parent, locate the formal packages
7651 -- of its generic parent.
7653 if Is_Generic_Instance (Par) then
7654 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
7655 Gen_E := First_Entity (Gen);
7658 while Present (E) loop
7659 if Ekind (E) = E_Package
7660 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
7662 -- If this is the renaming for the parent instance, done
7664 if Renamed_Object (E) = Par then
7667 -- The visibility of a formal of an enclosing generic is already
7670 elsif Denotes_Formal_Package (E) then
7673 elsif Present (Associated_Formal_Package (E)) then
7674 Check_Generic_Actuals (Renamed_Object (E), True);
7675 Set_Is_Hidden (E, False);
7677 -- Find formal package in generic unit that corresponds to
7678 -- (instance of) formal package in instance.
7680 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
7681 Next_Entity (Gen_E);
7684 if Present (Gen_E) then
7685 Map_Formal_Package_Entities (Gen_E, E);
7691 if Present (Gen_E) then
7692 Next_Entity (Gen_E);
7695 end Install_Formal_Packages;
7697 --------------------
7698 -- Install_Parent --
7699 --------------------
7701 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
7702 Ancestors : constant Elist_Id := New_Elmt_List;
7703 S : constant Entity_Id := Current_Scope;
7704 Inst_Par : Entity_Id;
7705 First_Par : Entity_Id;
7706 Inst_Node : Node_Id;
7707 Gen_Par : Entity_Id;
7708 First_Gen : Entity_Id;
7711 procedure Install_Noninstance_Specs (Par : Entity_Id);
7712 -- Install the scopes of noninstance parent units ending with Par
7714 procedure Install_Spec (Par : Entity_Id);
7715 -- The child unit is within the declarative part of the parent, so
7716 -- the declarations within the parent are immediately visible.
7718 -------------------------------
7719 -- Install_Noninstance_Specs --
7720 -------------------------------
7722 procedure Install_Noninstance_Specs (Par : Entity_Id) is
7725 and then Par /= Standard_Standard
7726 and then not In_Open_Scopes (Par)
7728 Install_Noninstance_Specs (Scope (Par));
7731 end Install_Noninstance_Specs;
7737 procedure Install_Spec (Par : Entity_Id) is
7738 Spec : constant Node_Id :=
7739 Specification (Unit_Declaration_Node (Par));
7742 -- If this parent of the child instance is a top-level unit,
7743 -- then record the unit and its visibility for later resetting
7744 -- in Remove_Parent. We exclude units that are generic instances,
7745 -- as we only want to record this information for the ultimate
7746 -- top-level noninstance parent (is that always correct???).
7748 if Scope (Par) = Standard_Standard
7749 and then not Is_Generic_Instance (Par)
7751 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7752 Instance_Parent_Unit := Par;
7755 -- Open the parent scope and make it and its declarations visible.
7756 -- If this point is not within a body, then only the visible
7757 -- declarations should be made visible, and installation of the
7758 -- private declarations is deferred until the appropriate point
7759 -- within analysis of the spec being instantiated (see the handling
7760 -- of parent visibility in Analyze_Package_Specification). This is
7761 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7762 -- private view problems that occur when compiling instantiations of
7763 -- a generic child of that package (Generic_Dispatching_Constructor).
7764 -- If the instance freezes a tagged type, inlinings of operations
7765 -- from Ada.Tags may need the full view of type Tag. If inlining took
7766 -- proper account of establishing visibility of inlined subprograms'
7767 -- parents then it should be possible to remove this
7768 -- special check. ???
7771 Set_Is_Immediately_Visible (Par);
7772 Install_Visible_Declarations (Par);
7773 Set_Use (Visible_Declarations (Spec));
7775 if In_Body or else Is_RTU (Par, Ada_Tags) then
7776 Install_Private_Declarations (Par);
7777 Set_Use (Private_Declarations (Spec));
7781 -- Start of processing for Install_Parent
7784 -- We need to install the parent instance to compile the instantiation
7785 -- of the child, but the child instance must appear in the current
7786 -- scope. Given that we cannot place the parent above the current scope
7787 -- in the scope stack, we duplicate the current scope and unstack both
7788 -- after the instantiation is complete.
7790 -- If the parent is itself the instantiation of a child unit, we must
7791 -- also stack the instantiation of its parent, and so on. Each such
7792 -- ancestor is the prefix of the name in a prior instantiation.
7794 -- If this is a nested instance, the parent unit itself resolves to
7795 -- a renaming of the parent instance, whose declaration we need.
7797 -- Finally, the parent may be a generic (not an instance) when the
7798 -- child unit appears as a formal package.
7802 if Present (Renamed_Entity (Inst_Par)) then
7803 Inst_Par := Renamed_Entity (Inst_Par);
7806 First_Par := Inst_Par;
7809 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7811 First_Gen := Gen_Par;
7813 while Present (Gen_Par)
7814 and then Is_Child_Unit (Gen_Par)
7816 -- Load grandparent instance as well
7818 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7820 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7821 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7823 if Present (Renamed_Entity (Inst_Par)) then
7824 Inst_Par := Renamed_Entity (Inst_Par);
7829 (Specification (Unit_Declaration_Node (Inst_Par)));
7831 if Present (Gen_Par) then
7832 Prepend_Elmt (Inst_Par, Ancestors);
7835 -- Parent is not the name of an instantiation
7837 Install_Noninstance_Specs (Inst_Par);
7849 if Present (First_Gen) then
7850 Append_Elmt (First_Par, Ancestors);
7853 Install_Noninstance_Specs (First_Par);
7856 if not Is_Empty_Elmt_List (Ancestors) then
7857 Elmt := First_Elmt (Ancestors);
7859 while Present (Elmt) loop
7860 Install_Spec (Node (Elmt));
7861 Install_Formal_Packages (Node (Elmt));
7872 --------------------------------
7873 -- Instantiate_Formal_Package --
7874 --------------------------------
7876 function Instantiate_Formal_Package
7879 Analyzed_Formal : Node_Id) return List_Id
7881 Loc : constant Source_Ptr := Sloc (Actual);
7882 Actual_Pack : Entity_Id;
7883 Formal_Pack : Entity_Id;
7884 Gen_Parent : Entity_Id;
7887 Parent_Spec : Node_Id;
7889 procedure Find_Matching_Actual
7891 Act : in out Entity_Id);
7892 -- We need to associate each formal entity in the formal package
7893 -- with the corresponding entity in the actual package. The actual
7894 -- package has been analyzed and possibly expanded, and as a result
7895 -- there is no one-to-one correspondence between the two lists (for
7896 -- example, the actual may include subtypes, itypes, and inherited
7897 -- primitive operations, interspersed among the renaming declarations
7898 -- for the actuals) . We retrieve the corresponding actual by name
7899 -- because each actual has the same name as the formal, and they do
7900 -- appear in the same order.
7902 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7903 -- Retrieve entity of defining entity of generic formal parameter.
7904 -- Only the declarations of formals need to be considered when
7905 -- linking them to actuals, but the declarative list may include
7906 -- internal entities generated during analysis, and those are ignored.
7908 procedure Match_Formal_Entity
7909 (Formal_Node : Node_Id;
7910 Formal_Ent : Entity_Id;
7911 Actual_Ent : Entity_Id);
7912 -- Associates the formal entity with the actual. In the case
7913 -- where Formal_Ent is a formal package, this procedure iterates
7914 -- through all of its formals and enters associations between the
7915 -- actuals occurring in the formal package's corresponding actual
7916 -- package (given by Actual_Ent) and the formal package's formal
7917 -- parameters. This procedure recurses if any of the parameters is
7918 -- itself a package.
7920 function Is_Instance_Of
7921 (Act_Spec : Entity_Id;
7922 Gen_Anc : Entity_Id) return Boolean;
7923 -- The actual can be an instantiation of a generic within another
7924 -- instance, in which case there is no direct link from it to the
7925 -- original generic ancestor. In that case, we recognize that the
7926 -- ultimate ancestor is the same by examining names and scopes.
7928 procedure Process_Nested_Formal (Formal : Entity_Id);
7929 -- If the current formal is declared with a box, its own formals are
7930 -- visible in the instance, as they were in the generic, and their
7931 -- Hidden flag must be reset. If some of these formals are themselves
7932 -- packages declared with a box, the processing must be recursive.
7934 --------------------------
7935 -- Find_Matching_Actual --
7936 --------------------------
7938 procedure Find_Matching_Actual
7940 Act : in out Entity_Id)
7942 Formal_Ent : Entity_Id;
7945 case Nkind (Original_Node (F)) is
7946 when N_Formal_Object_Declaration |
7947 N_Formal_Type_Declaration =>
7948 Formal_Ent := Defining_Identifier (F);
7950 while Chars (Act) /= Chars (Formal_Ent) loop
7954 when N_Formal_Subprogram_Declaration |
7955 N_Formal_Package_Declaration |
7956 N_Package_Declaration |
7957 N_Generic_Package_Declaration =>
7958 Formal_Ent := Defining_Entity (F);
7960 while Chars (Act) /= Chars (Formal_Ent) loop
7965 raise Program_Error;
7967 end Find_Matching_Actual;
7969 -------------------------
7970 -- Match_Formal_Entity --
7971 -------------------------
7973 procedure Match_Formal_Entity
7974 (Formal_Node : Node_Id;
7975 Formal_Ent : Entity_Id;
7976 Actual_Ent : Entity_Id)
7978 Act_Pkg : Entity_Id;
7981 Set_Instance_Of (Formal_Ent, Actual_Ent);
7983 if Ekind (Actual_Ent) = E_Package then
7985 -- Record associations for each parameter
7987 Act_Pkg := Actual_Ent;
7990 A_Ent : Entity_Id := First_Entity (Act_Pkg);
7999 -- Retrieve the actual given in the formal package declaration
8001 Actual := Entity (Name (Original_Node (Formal_Node)));
8003 -- The actual in the formal package declaration may be a
8004 -- renamed generic package, in which case we want to retrieve
8005 -- the original generic in order to traverse its formal part.
8007 if Present (Renamed_Entity (Actual)) then
8008 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
8010 Gen_Decl := Unit_Declaration_Node (Actual);
8013 Formals := Generic_Formal_Declarations (Gen_Decl);
8015 if Present (Formals) then
8016 F_Node := First_Non_Pragma (Formals);
8021 while Present (A_Ent)
8022 and then Present (F_Node)
8023 and then A_Ent /= First_Private_Entity (Act_Pkg)
8025 F_Ent := Get_Formal_Entity (F_Node);
8027 if Present (F_Ent) then
8029 -- This is a formal of the original package. Record
8030 -- association and recurse.
8032 Find_Matching_Actual (F_Node, A_Ent);
8033 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
8034 Next_Entity (A_Ent);
8037 Next_Non_Pragma (F_Node);
8041 end Match_Formal_Entity;
8043 -----------------------
8044 -- Get_Formal_Entity --
8045 -----------------------
8047 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
8048 Kind : constant Node_Kind := Nkind (Original_Node (N));
8051 when N_Formal_Object_Declaration =>
8052 return Defining_Identifier (N);
8054 when N_Formal_Type_Declaration =>
8055 return Defining_Identifier (N);
8057 when N_Formal_Subprogram_Declaration =>
8058 return Defining_Unit_Name (Specification (N));
8060 when N_Formal_Package_Declaration =>
8061 return Defining_Identifier (Original_Node (N));
8063 when N_Generic_Package_Declaration =>
8064 return Defining_Identifier (Original_Node (N));
8066 -- All other declarations are introduced by semantic analysis and
8067 -- have no match in the actual.
8072 end Get_Formal_Entity;
8074 --------------------
8075 -- Is_Instance_Of --
8076 --------------------
8078 function Is_Instance_Of
8079 (Act_Spec : Entity_Id;
8080 Gen_Anc : Entity_Id) return Boolean
8082 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
8085 if No (Gen_Par) then
8088 -- Simplest case: the generic parent of the actual is the formal
8090 elsif Gen_Par = Gen_Anc then
8093 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
8096 -- The actual may be obtained through several instantiations. Its
8097 -- scope must itself be an instance of a generic declared in the
8098 -- same scope as the formal. Any other case is detected above.
8100 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
8104 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
8108 ---------------------------
8109 -- Process_Nested_Formal --
8110 ---------------------------
8112 procedure Process_Nested_Formal (Formal : Entity_Id) is
8116 if Present (Associated_Formal_Package (Formal))
8117 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8119 Ent := First_Entity (Formal);
8120 while Present (Ent) loop
8121 Set_Is_Hidden (Ent, False);
8122 Set_Is_Visible_Formal (Ent);
8123 Set_Is_Potentially_Use_Visible
8124 (Ent, Is_Potentially_Use_Visible (Formal));
8126 if Ekind (Ent) = E_Package then
8127 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
8128 Process_Nested_Formal (Ent);
8134 end Process_Nested_Formal;
8136 -- Start of processing for Instantiate_Formal_Package
8141 if not Is_Entity_Name (Actual)
8142 or else Ekind (Entity (Actual)) /= E_Package
8145 ("expect package instance to instantiate formal", Actual);
8146 Abandon_Instantiation (Actual);
8147 raise Program_Error;
8150 Actual_Pack := Entity (Actual);
8151 Set_Is_Instantiated (Actual_Pack);
8153 -- The actual may be a renamed package, or an outer generic formal
8154 -- package whose instantiation is converted into a renaming.
8156 if Present (Renamed_Object (Actual_Pack)) then
8157 Actual_Pack := Renamed_Object (Actual_Pack);
8160 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
8161 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
8162 Formal_Pack := Defining_Identifier (Analyzed_Formal);
8165 Generic_Parent (Specification (Analyzed_Formal));
8167 Defining_Unit_Name (Specification (Analyzed_Formal));
8170 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
8171 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
8173 Parent_Spec := Parent (Actual_Pack);
8176 if Gen_Parent = Any_Id then
8178 ("previous error in declaration of formal package", Actual);
8179 Abandon_Instantiation (Actual);
8182 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
8188 ("actual parameter must be instance of&", Actual, Gen_Parent);
8189 Abandon_Instantiation (Actual);
8192 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
8193 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
8196 Make_Package_Renaming_Declaration (Loc,
8197 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
8198 Name => New_Reference_To (Actual_Pack, Loc));
8200 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
8201 Defining_Identifier (Formal));
8202 Decls := New_List (Nod);
8204 -- If the formal F has a box, then the generic declarations are
8205 -- visible in the generic G. In an instance of G, the corresponding
8206 -- entities in the actual for F (which are the actuals for the
8207 -- instantiation of the generic that F denotes) must also be made
8208 -- visible for analysis of the current instance. On exit from the
8209 -- current instance, those entities are made private again. If the
8210 -- actual is currently in use, these entities are also use-visible.
8212 -- The loop through the actual entities also steps through the formal
8213 -- entities and enters associations from formals to actuals into the
8214 -- renaming map. This is necessary to properly handle checking of
8215 -- actual parameter associations for later formals that depend on
8216 -- actuals declared in the formal package.
8218 -- In Ada 2005, partial parametrization requires that we make visible
8219 -- the actuals corresponding to formals that were defaulted in the
8220 -- formal package. There formals are identified because they remain
8221 -- formal generics within the formal package, rather than being
8222 -- renamings of the actuals supplied.
8225 Gen_Decl : constant Node_Id :=
8226 Unit_Declaration_Node (Gen_Parent);
8227 Formals : constant List_Id :=
8228 Generic_Formal_Declarations (Gen_Decl);
8230 Actual_Ent : Entity_Id;
8231 Actual_Of_Formal : Node_Id;
8232 Formal_Node : Node_Id;
8233 Formal_Ent : Entity_Id;
8236 if Present (Formals) then
8237 Formal_Node := First_Non_Pragma (Formals);
8239 Formal_Node := Empty;
8242 Actual_Ent := First_Entity (Actual_Pack);
8244 First (Visible_Declarations (Specification (Analyzed_Formal)));
8245 while Present (Actual_Ent)
8246 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8248 if Present (Formal_Node) then
8249 Formal_Ent := Get_Formal_Entity (Formal_Node);
8251 if Present (Formal_Ent) then
8252 Find_Matching_Actual (Formal_Node, Actual_Ent);
8254 (Formal_Node, Formal_Ent, Actual_Ent);
8256 -- We iterate at the same time over the actuals of the
8257 -- local package created for the formal, to determine
8258 -- which one of the formals of the original generic were
8259 -- defaulted in the formal. The corresponding actual
8260 -- entities are visible in the enclosing instance.
8262 if Box_Present (Formal)
8264 (Present (Actual_Of_Formal)
8267 (Get_Formal_Entity (Actual_Of_Formal)))
8269 Set_Is_Hidden (Actual_Ent, False);
8270 Set_Is_Visible_Formal (Actual_Ent);
8271 Set_Is_Potentially_Use_Visible
8272 (Actual_Ent, In_Use (Actual_Pack));
8274 if Ekind (Actual_Ent) = E_Package then
8275 Process_Nested_Formal (Actual_Ent);
8279 Set_Is_Hidden (Actual_Ent);
8280 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
8284 Next_Non_Pragma (Formal_Node);
8285 Next (Actual_Of_Formal);
8288 -- No further formals to match, but the generic part may
8289 -- contain inherited operation that are not hidden in the
8290 -- enclosing instance.
8292 Next_Entity (Actual_Ent);
8296 -- Inherited subprograms generated by formal derived types are
8297 -- also visible if the types are.
8299 Actual_Ent := First_Entity (Actual_Pack);
8300 while Present (Actual_Ent)
8301 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
8303 if Is_Overloadable (Actual_Ent)
8305 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
8307 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
8309 Set_Is_Hidden (Actual_Ent, False);
8310 Set_Is_Potentially_Use_Visible
8311 (Actual_Ent, In_Use (Actual_Pack));
8314 Next_Entity (Actual_Ent);
8318 -- If the formal is not declared with a box, reanalyze it as an
8319 -- abbreviated instantiation, to verify the matching rules of 12.7.
8320 -- The actual checks are performed after the generic associations
8321 -- have been analyzed, to guarantee the same visibility for this
8322 -- instantiation and for the actuals.
8324 -- In Ada 2005, the generic associations for the formal can include
8325 -- defaulted parameters. These are ignored during check. This
8326 -- internal instantiation is removed from the tree after conformance
8327 -- checking, because it contains formal declarations for those
8328 -- defaulted parameters, and those should not reach the back-end.
8330 if not Box_Present (Formal) then
8332 I_Pack : constant Entity_Id :=
8333 Make_Temporary (Sloc (Actual), 'P');
8336 Set_Is_Internal (I_Pack);
8339 Make_Package_Instantiation (Sloc (Actual),
8340 Defining_Unit_Name => I_Pack,
8343 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
8344 Generic_Associations =>
8345 Generic_Associations (Formal)));
8351 end Instantiate_Formal_Package;
8353 -----------------------------------
8354 -- Instantiate_Formal_Subprogram --
8355 -----------------------------------
8357 function Instantiate_Formal_Subprogram
8360 Analyzed_Formal : Node_Id) return Node_Id
8363 Formal_Sub : constant Entity_Id :=
8364 Defining_Unit_Name (Specification (Formal));
8365 Analyzed_S : constant Entity_Id :=
8366 Defining_Unit_Name (Specification (Analyzed_Formal));
8367 Decl_Node : Node_Id;
8371 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
8372 -- If the generic is a child unit, the parent has been installed on the
8373 -- scope stack, but a default subprogram cannot resolve to something on
8374 -- the parent because that parent is not really part of the visible
8375 -- context (it is there to resolve explicit local entities). If the
8376 -- default has resolved in this way, we remove the entity from
8377 -- immediate visibility and analyze the node again to emit an error
8378 -- message or find another visible candidate.
8380 procedure Valid_Actual_Subprogram (Act : Node_Id);
8381 -- Perform legality check and raise exception on failure
8383 -----------------------
8384 -- From_Parent_Scope --
8385 -----------------------
8387 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
8388 Gen_Scope : Node_Id;
8391 Gen_Scope := Scope (Analyzed_S);
8392 while Present (Gen_Scope)
8393 and then Is_Child_Unit (Gen_Scope)
8395 if Scope (Subp) = Scope (Gen_Scope) then
8399 Gen_Scope := Scope (Gen_Scope);
8403 end From_Parent_Scope;
8405 -----------------------------
8406 -- Valid_Actual_Subprogram --
8407 -----------------------------
8409 procedure Valid_Actual_Subprogram (Act : Node_Id) is
8413 if Is_Entity_Name (Act) then
8414 Act_E := Entity (Act);
8416 elsif Nkind (Act) = N_Selected_Component
8417 and then Is_Entity_Name (Selector_Name (Act))
8419 Act_E := Entity (Selector_Name (Act));
8425 if (Present (Act_E) and then Is_Overloadable (Act_E))
8426 or else Nkind_In (Act, N_Attribute_Reference,
8427 N_Indexed_Component,
8428 N_Character_Literal,
8429 N_Explicit_Dereference)
8435 ("expect subprogram or entry name in instantiation of&",
8436 Instantiation_Node, Formal_Sub);
8437 Abandon_Instantiation (Instantiation_Node);
8439 end Valid_Actual_Subprogram;
8441 -- Start of processing for Instantiate_Formal_Subprogram
8444 New_Spec := New_Copy_Tree (Specification (Formal));
8446 -- The tree copy has created the proper instantiation sloc for the
8447 -- new specification. Use this location for all other constructed
8450 Loc := Sloc (Defining_Unit_Name (New_Spec));
8452 -- Create new entity for the actual (New_Copy_Tree does not)
8454 Set_Defining_Unit_Name
8455 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8457 -- Create new entities for the each of the formals in the
8458 -- specification of the renaming declaration built for the actual.
8460 if Present (Parameter_Specifications (New_Spec)) then
8464 F := First (Parameter_Specifications (New_Spec));
8465 while Present (F) loop
8466 Set_Defining_Identifier (F,
8467 Make_Defining_Identifier (Sloc (F),
8468 Chars => Chars (Defining_Identifier (F))));
8474 -- Find entity of actual. If the actual is an attribute reference, it
8475 -- cannot be resolved here (its formal is missing) but is handled
8476 -- instead in Attribute_Renaming. If the actual is overloaded, it is
8477 -- fully resolved subsequently, when the renaming declaration for the
8478 -- formal is analyzed. If it is an explicit dereference, resolve the
8479 -- prefix but not the actual itself, to prevent interpretation as call.
8481 if Present (Actual) then
8482 Loc := Sloc (Actual);
8483 Set_Sloc (New_Spec, Loc);
8485 if Nkind (Actual) = N_Operator_Symbol then
8486 Find_Direct_Name (Actual);
8488 elsif Nkind (Actual) = N_Explicit_Dereference then
8489 Analyze (Prefix (Actual));
8491 elsif Nkind (Actual) /= N_Attribute_Reference then
8495 Valid_Actual_Subprogram (Actual);
8498 elsif Present (Default_Name (Formal)) then
8499 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
8500 N_Selected_Component,
8501 N_Indexed_Component,
8502 N_Character_Literal)
8503 and then Present (Entity (Default_Name (Formal)))
8505 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
8507 Nam := New_Copy (Default_Name (Formal));
8508 Set_Sloc (Nam, Loc);
8511 elsif Box_Present (Formal) then
8513 -- Actual is resolved at the point of instantiation. Create an
8514 -- identifier or operator with the same name as the formal.
8516 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
8517 Nam := Make_Operator_Symbol (Loc,
8518 Chars => Chars (Formal_Sub),
8519 Strval => No_String);
8521 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
8524 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
8525 and then Null_Present (Specification (Formal))
8527 -- Generate null body for procedure, for use in the instance
8530 Make_Subprogram_Body (Loc,
8531 Specification => New_Spec,
8532 Declarations => New_List,
8533 Handled_Statement_Sequence =>
8534 Make_Handled_Sequence_Of_Statements (Loc,
8535 Statements => New_List (Make_Null_Statement (Loc))));
8537 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
8541 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
8543 ("missing actual&", Instantiation_Node, Formal_Sub);
8545 ("\in instantiation of & declared#",
8546 Instantiation_Node, Scope (Analyzed_S));
8547 Abandon_Instantiation (Instantiation_Node);
8551 Make_Subprogram_Renaming_Declaration (Loc,
8552 Specification => New_Spec,
8555 -- If we do not have an actual and the formal specified <> then set to
8556 -- get proper default.
8558 if No (Actual) and then Box_Present (Formal) then
8559 Set_From_Default (Decl_Node);
8562 -- Gather possible interpretations for the actual before analyzing the
8563 -- instance. If overloaded, it will be resolved when analyzing the
8564 -- renaming declaration.
8566 if Box_Present (Formal)
8567 and then No (Actual)
8571 if Is_Child_Unit (Scope (Analyzed_S))
8572 and then Present (Entity (Nam))
8574 if not Is_Overloaded (Nam) then
8576 if From_Parent_Scope (Entity (Nam)) then
8577 Set_Is_Immediately_Visible (Entity (Nam), False);
8578 Set_Entity (Nam, Empty);
8579 Set_Etype (Nam, Empty);
8583 Set_Is_Immediately_Visible (Entity (Nam));
8592 Get_First_Interp (Nam, I, It);
8594 while Present (It.Nam) loop
8595 if From_Parent_Scope (It.Nam) then
8599 Get_Next_Interp (I, It);
8606 -- The generic instantiation freezes the actual. This can only be done
8607 -- once the actual is resolved, in the analysis of the renaming
8608 -- declaration. To make the formal subprogram entity available, we set
8609 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8610 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8611 -- of formal abstract subprograms.
8613 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
8615 -- We cannot analyze the renaming declaration, and thus find the actual,
8616 -- until all the actuals are assembled in the instance. For subsequent
8617 -- checks of other actuals, indicate the node that will hold the
8618 -- instance of this formal.
8620 Set_Instance_Of (Analyzed_S, Nam);
8622 if Nkind (Actual) = N_Selected_Component
8623 and then Is_Task_Type (Etype (Prefix (Actual)))
8624 and then not Is_Frozen (Etype (Prefix (Actual)))
8626 -- The renaming declaration will create a body, which must appear
8627 -- outside of the instantiation, We move the renaming declaration
8628 -- out of the instance, and create an additional renaming inside,
8629 -- to prevent freezing anomalies.
8632 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
8635 Set_Defining_Unit_Name (New_Spec, Anon_Id);
8636 Insert_Before (Instantiation_Node, Decl_Node);
8637 Analyze (Decl_Node);
8639 -- Now create renaming within the instance
8642 Make_Subprogram_Renaming_Declaration (Loc,
8643 Specification => New_Copy_Tree (New_Spec),
8644 Name => New_Occurrence_Of (Anon_Id, Loc));
8646 Set_Defining_Unit_Name (Specification (Decl_Node),
8647 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8652 end Instantiate_Formal_Subprogram;
8654 ------------------------
8655 -- Instantiate_Object --
8656 ------------------------
8658 function Instantiate_Object
8661 Analyzed_Formal : Node_Id) return List_Id
8663 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
8664 A_Gen_Obj : constant Entity_Id :=
8665 Defining_Identifier (Analyzed_Formal);
8666 Acc_Def : Node_Id := Empty;
8667 Act_Assoc : constant Node_Id := Parent (Actual);
8668 Actual_Decl : Node_Id := Empty;
8669 Decl_Node : Node_Id;
8672 List : constant List_Id := New_List;
8673 Loc : constant Source_Ptr := Sloc (Actual);
8674 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
8675 Subt_Decl : Node_Id := Empty;
8676 Subt_Mark : Node_Id := Empty;
8679 if Present (Subtype_Mark (Formal)) then
8680 Subt_Mark := Subtype_Mark (Formal);
8682 Check_Access_Definition (Formal);
8683 Acc_Def := Access_Definition (Formal);
8686 -- Sloc for error message on missing actual
8688 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
8690 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
8691 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8694 Set_Parent (List, Parent (Actual));
8698 if Out_Present (Formal) then
8700 -- An IN OUT generic actual must be a name. The instantiation is a
8701 -- renaming declaration. The actual is the name being renamed. We
8702 -- use the actual directly, rather than a copy, because it is not
8703 -- used further in the list of actuals, and because a copy or a use
8704 -- of relocate_node is incorrect if the instance is nested within a
8705 -- generic. In order to simplify ASIS searches, the Generic_Parent
8706 -- field links the declaration to the generic association.
8711 Instantiation_Node, Gen_Obj);
8713 ("\in instantiation of & declared#",
8714 Instantiation_Node, Scope (A_Gen_Obj));
8715 Abandon_Instantiation (Instantiation_Node);
8718 if Present (Subt_Mark) then
8720 Make_Object_Renaming_Declaration (Loc,
8721 Defining_Identifier => New_Copy (Gen_Obj),
8722 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8725 else pragma Assert (Present (Acc_Def));
8727 Make_Object_Renaming_Declaration (Loc,
8728 Defining_Identifier => New_Copy (Gen_Obj),
8729 Access_Definition => New_Copy_Tree (Acc_Def),
8733 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8735 -- The analysis of the actual may produce insert_action nodes, so
8736 -- the declaration must have a context in which to attach them.
8738 Append (Decl_Node, List);
8741 -- Return if the analysis of the actual reported some error
8743 if Etype (Actual) = Any_Type then
8747 -- This check is performed here because Analyze_Object_Renaming will
8748 -- not check it when Comes_From_Source is False. Note though that the
8749 -- check for the actual being the name of an object will be performed
8750 -- in Analyze_Object_Renaming.
8752 if Is_Object_Reference (Actual)
8753 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8756 ("illegal discriminant-dependent component for in out parameter",
8760 -- The actual has to be resolved in order to check that it is a
8761 -- variable (due to cases such as F (1), where F returns access to an
8762 -- array, and for overloaded prefixes).
8764 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
8766 -- If the type of the formal is not itself a formal, and the
8767 -- current unit is a child unit, the formal type must be declared
8768 -- in a parent, and must be retrieved by visibility.
8771 and then Is_Generic_Unit (Scope (Ftyp))
8772 and then Is_Child_Unit (Scope (A_Gen_Obj))
8775 Temp : constant Node_Id :=
8776 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
8778 Set_Entity (Temp, Empty);
8780 Ftyp := Entity (Temp);
8784 if Is_Private_Type (Ftyp)
8785 and then not Is_Private_Type (Etype (Actual))
8786 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8787 or else Base_Type (Etype (Actual)) = Ftyp)
8789 -- If the actual has the type of the full view of the formal, or
8790 -- else a non-private subtype of the formal, then the visibility
8791 -- of the formal type has changed. Add to the actuals a subtype
8792 -- declaration that will force the exchange of views in the body
8793 -- of the instance as well.
8796 Make_Subtype_Declaration (Loc,
8797 Defining_Identifier => Make_Temporary (Loc, 'P'),
8798 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8800 Prepend (Subt_Decl, List);
8802 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8803 Exchange_Declarations (Ftyp);
8806 Resolve (Actual, Ftyp);
8808 if not Denotes_Variable (Actual) then
8810 ("actual for& must be a variable", Actual, Gen_Obj);
8812 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8814 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8815 -- the type of the actual shall resolve to a specific anonymous
8818 if Ada_Version < Ada_2005
8820 Ekind (Base_Type (Ftyp)) /=
8821 E_Anonymous_Access_Type
8823 Ekind (Base_Type (Etype (Actual))) /=
8824 E_Anonymous_Access_Type
8826 Error_Msg_NE ("type of actual does not match type of&",
8831 Note_Possible_Modification (Actual, Sure => True);
8833 -- Check for instantiation of atomic/volatile actual for
8834 -- non-atomic/volatile formal (RM C.6 (12)).
8836 if Is_Atomic_Object (Actual)
8837 and then not Is_Atomic (Orig_Ftyp)
8840 ("cannot instantiate non-atomic formal object " &
8841 "with atomic actual", Actual);
8843 elsif Is_Volatile_Object (Actual)
8844 and then not Is_Volatile (Orig_Ftyp)
8847 ("cannot instantiate non-volatile formal object " &
8848 "with volatile actual", Actual);
8851 -- Formal in-parameter
8854 -- The instantiation of a generic formal in-parameter is constant
8855 -- declaration. The actual is the expression for that declaration.
8857 if Present (Actual) then
8858 if Present (Subt_Mark) then
8860 else pragma Assert (Present (Acc_Def));
8865 Make_Object_Declaration (Loc,
8866 Defining_Identifier => New_Copy (Gen_Obj),
8867 Constant_Present => True,
8868 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8869 Object_Definition => New_Copy_Tree (Def),
8870 Expression => Actual);
8872 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8874 -- A generic formal object of a tagged type is defined to be
8875 -- aliased so the new constant must also be treated as aliased.
8877 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
8878 Set_Aliased_Present (Decl_Node);
8881 Append (Decl_Node, List);
8883 -- No need to repeat (pre-)analysis of some expression nodes
8884 -- already handled in Preanalyze_Actuals.
8886 if Nkind (Actual) /= N_Allocator then
8889 -- Return if the analysis of the actual reported some error
8891 if Etype (Actual) = Any_Type then
8897 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
8901 Typ := Get_Instance_Of (Formal_Type);
8903 Freeze_Before (Instantiation_Node, Typ);
8905 -- If the actual is an aggregate, perform name resolution on
8906 -- its components (the analysis of an aggregate does not do it)
8907 -- to capture local names that may be hidden if the generic is
8910 if Nkind (Actual) = N_Aggregate then
8911 Preanalyze_And_Resolve (Actual, Typ);
8914 if Is_Limited_Type (Typ)
8915 and then not OK_For_Limited_Init (Typ, Actual)
8918 ("initialization not allowed for limited types", Actual);
8919 Explain_Limited_Type (Typ, Actual);
8923 elsif Present (Default_Expression (Formal)) then
8925 -- Use default to construct declaration
8927 if Present (Subt_Mark) then
8929 else pragma Assert (Present (Acc_Def));
8934 Make_Object_Declaration (Sloc (Formal),
8935 Defining_Identifier => New_Copy (Gen_Obj),
8936 Constant_Present => True,
8937 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8938 Object_Definition => New_Copy (Def),
8939 Expression => New_Copy_Tree
8940 (Default_Expression (Formal)));
8942 Append (Decl_Node, List);
8943 Set_Analyzed (Expression (Decl_Node), False);
8948 Instantiation_Node, Gen_Obj);
8949 Error_Msg_NE ("\in instantiation of & declared#",
8950 Instantiation_Node, Scope (A_Gen_Obj));
8952 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
8954 -- Create dummy constant declaration so that instance can be
8955 -- analyzed, to minimize cascaded visibility errors.
8957 if Present (Subt_Mark) then
8959 else pragma Assert (Present (Acc_Def));
8964 Make_Object_Declaration (Loc,
8965 Defining_Identifier => New_Copy (Gen_Obj),
8966 Constant_Present => True,
8967 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8968 Object_Definition => New_Copy (Def),
8970 Make_Attribute_Reference (Sloc (Gen_Obj),
8971 Attribute_Name => Name_First,
8972 Prefix => New_Copy (Def)));
8974 Append (Decl_Node, List);
8977 Abandon_Instantiation (Instantiation_Node);
8982 if Nkind (Actual) in N_Has_Entity then
8983 Actual_Decl := Parent (Entity (Actual));
8986 -- Ada 2005 (AI-423): For a formal object declaration with a null
8987 -- exclusion or an access definition that has a null exclusion: If the
8988 -- actual matching the formal object declaration denotes a generic
8989 -- formal object of another generic unit G, and the instantiation
8990 -- containing the actual occurs within the body of G or within the body
8991 -- of a generic unit declared within the declarative region of G, then
8992 -- the declaration of the formal object of G must have a null exclusion.
8993 -- Otherwise, the subtype of the actual matching the formal object
8994 -- declaration shall exclude null.
8996 if Ada_Version >= Ada_2005
8997 and then Present (Actual_Decl)
8999 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
9000 N_Object_Declaration)
9001 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
9002 and then not Has_Null_Exclusion (Actual_Decl)
9003 and then Has_Null_Exclusion (Analyzed_Formal)
9005 Error_Msg_Sloc := Sloc (Analyzed_Formal);
9007 ("actual must exclude null to match generic formal#", Actual);
9011 end Instantiate_Object;
9013 ------------------------------
9014 -- Instantiate_Package_Body --
9015 ------------------------------
9017 procedure Instantiate_Package_Body
9018 (Body_Info : Pending_Body_Info;
9019 Inlined_Body : Boolean := False;
9020 Body_Optional : Boolean := False)
9022 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9023 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9024 Loc : constant Source_Ptr := Sloc (Inst_Node);
9026 Gen_Id : constant Node_Id := Name (Inst_Node);
9027 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9028 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9029 Act_Spec : constant Node_Id := Specification (Act_Decl);
9030 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
9032 Act_Body_Name : Node_Id;
9034 Gen_Body_Id : Node_Id;
9036 Act_Body_Id : Entity_Id;
9038 Parent_Installed : Boolean := False;
9039 Save_Style_Check : constant Boolean := Style_Check;
9041 Par_Ent : Entity_Id := Empty;
9042 Par_Vis : Boolean := False;
9045 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9047 -- The instance body may already have been processed, as the parent of
9048 -- another instance that is inlined (Load_Parent_Of_Generic).
9050 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
9054 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9056 -- Re-establish the state of information on which checks are suppressed.
9057 -- This information was set in Body_Info at the point of instantiation,
9058 -- and now we restore it so that the instance is compiled using the
9059 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9061 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9062 Scope_Suppress := Body_Info.Scope_Suppress;
9063 Opt.Ada_Version := Body_Info.Version;
9065 if No (Gen_Body_Id) then
9066 Load_Parent_Of_Generic
9067 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9068 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9071 -- Establish global variable for sloc adjustment and for error recovery
9073 Instantiation_Node := Inst_Node;
9075 if Present (Gen_Body_Id) then
9076 Save_Env (Gen_Unit, Act_Decl_Id);
9077 Style_Check := False;
9078 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9080 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9082 Create_Instantiation_Source
9083 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
9087 (Original_Node (Gen_Body), Empty, Instantiating => True);
9089 -- Build new name (possibly qualified) for body declaration
9091 Act_Body_Id := New_Copy (Act_Decl_Id);
9093 -- Some attributes of spec entity are not inherited by body entity
9095 Set_Handler_Records (Act_Body_Id, No_List);
9097 if Nkind (Defining_Unit_Name (Act_Spec)) =
9098 N_Defining_Program_Unit_Name
9101 Make_Defining_Program_Unit_Name (Loc,
9102 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
9103 Defining_Identifier => Act_Body_Id);
9105 Act_Body_Name := Act_Body_Id;
9108 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
9110 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
9111 Check_Generic_Actuals (Act_Decl_Id, False);
9113 -- If it is a child unit, make the parent instance (which is an
9114 -- instance of the parent of the generic) visible. The parent
9115 -- instance is the prefix of the name of the generic unit.
9117 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9118 and then Nkind (Gen_Id) = N_Expanded_Name
9120 Par_Ent := Entity (Prefix (Gen_Id));
9121 Par_Vis := Is_Immediately_Visible (Par_Ent);
9122 Install_Parent (Par_Ent, In_Body => True);
9123 Parent_Installed := True;
9125 elsif Is_Child_Unit (Gen_Unit) then
9126 Par_Ent := Scope (Gen_Unit);
9127 Par_Vis := Is_Immediately_Visible (Par_Ent);
9128 Install_Parent (Par_Ent, In_Body => True);
9129 Parent_Installed := True;
9132 -- If the instantiation is a library unit, and this is the main unit,
9133 -- then build the resulting compilation unit nodes for the instance.
9134 -- If this is a compilation unit but it is not the main unit, then it
9135 -- is the body of a unit in the context, that is being compiled
9136 -- because it is encloses some inlined unit or another generic unit
9137 -- being instantiated. In that case, this body is not part of the
9138 -- current compilation, and is not attached to the tree, but its
9139 -- parent must be set for analysis.
9141 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9143 -- Replace instance node with body of instance, and create new
9144 -- node for corresponding instance declaration.
9146 Build_Instance_Compilation_Unit_Nodes
9147 (Inst_Node, Act_Body, Act_Decl);
9148 Analyze (Inst_Node);
9150 if Parent (Inst_Node) = Cunit (Main_Unit) then
9152 -- If the instance is a child unit itself, then set the scope
9153 -- of the expanded body to be the parent of the instantiation
9154 -- (ensuring that the fully qualified name will be generated
9155 -- for the elaboration subprogram).
9157 if Nkind (Defining_Unit_Name (Act_Spec)) =
9158 N_Defining_Program_Unit_Name
9161 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
9165 -- Case where instantiation is not a library unit
9168 -- If this is an early instantiation, i.e. appears textually
9169 -- before the corresponding body and must be elaborated first,
9170 -- indicate that the body instance is to be delayed.
9172 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
9174 -- Now analyze the body. We turn off all checks if this is an
9175 -- internal unit, since there is no reason to have checks on for
9176 -- any predefined run-time library code. All such code is designed
9177 -- to be compiled with checks off.
9179 -- Note that we do NOT apply this criterion to children of GNAT
9180 -- (or on VMS, children of DEC). The latter units must suppress
9181 -- checks explicitly if this is needed.
9183 if Is_Predefined_File_Name
9184 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
9186 Analyze (Act_Body, Suppress => All_Checks);
9192 Inherit_Context (Gen_Body, Inst_Node);
9194 -- Remove the parent instances if they have been placed on the scope
9195 -- stack to compile the body.
9197 if Parent_Installed then
9198 Remove_Parent (In_Body => True);
9200 -- Restore the previous visibility of the parent
9202 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9205 Restore_Private_Views (Act_Decl_Id);
9207 -- Remove the current unit from visibility if this is an instance
9208 -- that is not elaborated on the fly for inlining purposes.
9210 if not Inlined_Body then
9211 Set_Is_Immediately_Visible (Act_Decl_Id, False);
9215 Style_Check := Save_Style_Check;
9217 -- If we have no body, and the unit requires a body, then complain. This
9218 -- complaint is suppressed if we have detected other errors (since a
9219 -- common reason for missing the body is that it had errors).
9220 -- In CodePeer mode, a warning has been emitted already, no need for
9221 -- further messages.
9223 elsif Unit_Requires_Body (Gen_Unit)
9224 and then not Body_Optional
9226 if CodePeer_Mode then
9229 elsif Serious_Errors_Detected = 0 then
9231 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
9233 -- Don't attempt to perform any cleanup actions if some other error
9234 -- was already detected, since this can cause blowups.
9240 -- Case of package that does not need a body
9243 -- If the instantiation of the declaration is a library unit, rewrite
9244 -- the original package instantiation as a package declaration in the
9245 -- compilation unit node.
9247 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9248 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
9249 Rewrite (Inst_Node, Act_Decl);
9251 -- Generate elaboration entity, in case spec has elaboration code.
9252 -- This cannot be done when the instance is analyzed, because it
9253 -- is not known yet whether the body exists.
9255 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
9256 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
9258 -- If the instantiation is not a library unit, then append the
9259 -- declaration to the list of implicitly generated entities, unless
9260 -- it is already a list member which means that it was already
9263 elsif not Is_List_Member (Act_Decl) then
9264 Mark_Rewrite_Insertion (Act_Decl);
9265 Insert_Before (Inst_Node, Act_Decl);
9269 Expander_Mode_Restore;
9270 end Instantiate_Package_Body;
9272 ---------------------------------
9273 -- Instantiate_Subprogram_Body --
9274 ---------------------------------
9276 procedure Instantiate_Subprogram_Body
9277 (Body_Info : Pending_Body_Info;
9278 Body_Optional : Boolean := False)
9280 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
9281 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
9282 Loc : constant Source_Ptr := Sloc (Inst_Node);
9283 Gen_Id : constant Node_Id := Name (Inst_Node);
9284 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
9285 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
9286 Anon_Id : constant Entity_Id :=
9287 Defining_Unit_Name (Specification (Act_Decl));
9288 Pack_Id : constant Entity_Id :=
9289 Defining_Unit_Name (Parent (Act_Decl));
9292 Gen_Body_Id : Node_Id;
9294 Pack_Body : Node_Id;
9295 Prev_Formal : Entity_Id;
9297 Unit_Renaming : Node_Id;
9299 Parent_Installed : Boolean := False;
9300 Save_Style_Check : constant Boolean := Style_Check;
9302 Par_Ent : Entity_Id := Empty;
9303 Par_Vis : Boolean := False;
9306 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9308 -- Subprogram body may have been created already because of an inline
9309 -- pragma, or because of multiple elaborations of the enclosing package
9310 -- when several instances of the subprogram appear in the main unit.
9312 if Present (Corresponding_Body (Act_Decl)) then
9316 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
9318 -- Re-establish the state of information on which checks are suppressed.
9319 -- This information was set in Body_Info at the point of instantiation,
9320 -- and now we restore it so that the instance is compiled using the
9321 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
9323 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
9324 Scope_Suppress := Body_Info.Scope_Suppress;
9325 Opt.Ada_Version := Body_Info.Version;
9327 if No (Gen_Body_Id) then
9329 -- For imported generic subprogram, no body to compile, complete
9330 -- the spec entity appropriately.
9332 if Is_Imported (Gen_Unit) then
9333 Set_Is_Imported (Anon_Id);
9334 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
9335 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
9336 Set_Convention (Anon_Id, Convention (Gen_Unit));
9337 Set_Has_Completion (Anon_Id);
9340 -- For other cases, compile the body
9343 Load_Parent_Of_Generic
9344 (Inst_Node, Specification (Gen_Decl), Body_Optional);
9345 Gen_Body_Id := Corresponding_Body (Gen_Decl);
9349 Instantiation_Node := Inst_Node;
9351 if Present (Gen_Body_Id) then
9352 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
9354 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
9356 -- Either body is not present, or context is non-expanding, as
9357 -- when compiling a subunit. Mark the instance as completed, and
9358 -- diagnose a missing body when needed.
9361 and then Operating_Mode = Generate_Code
9364 ("missing proper body for instantiation", Gen_Body);
9367 Set_Has_Completion (Anon_Id);
9371 Save_Env (Gen_Unit, Anon_Id);
9372 Style_Check := False;
9373 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
9374 Create_Instantiation_Source
9382 (Original_Node (Gen_Body), Empty, Instantiating => True);
9384 -- Create proper defining name for the body, to correspond to
9385 -- the one in the spec.
9387 Set_Defining_Unit_Name (Specification (Act_Body),
9388 Make_Defining_Identifier
9389 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
9390 Set_Corresponding_Spec (Act_Body, Anon_Id);
9391 Set_Has_Completion (Anon_Id);
9392 Check_Generic_Actuals (Pack_Id, False);
9394 -- Generate a reference to link the visible subprogram instance to
9395 -- the generic body, which for navigation purposes is the only
9396 -- available source for the instance.
9399 (Related_Instance (Pack_Id),
9400 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
9402 -- If it is a child unit, make the parent instance (which is an
9403 -- instance of the parent of the generic) visible. The parent
9404 -- instance is the prefix of the name of the generic unit.
9406 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
9407 and then Nkind (Gen_Id) = N_Expanded_Name
9409 Par_Ent := Entity (Prefix (Gen_Id));
9410 Par_Vis := Is_Immediately_Visible (Par_Ent);
9411 Install_Parent (Par_Ent, In_Body => True);
9412 Parent_Installed := True;
9414 elsif Is_Child_Unit (Gen_Unit) then
9415 Par_Ent := Scope (Gen_Unit);
9416 Par_Vis := Is_Immediately_Visible (Par_Ent);
9417 Install_Parent (Par_Ent, In_Body => True);
9418 Parent_Installed := True;
9421 -- Inside its body, a reference to the generic unit is a reference
9422 -- to the instance. The corresponding renaming is the first
9423 -- declaration in the body.
9426 Make_Subprogram_Renaming_Declaration (Loc,
9429 Specification (Original_Node (Gen_Body)),
9431 Instantiating => True),
9432 Name => New_Occurrence_Of (Anon_Id, Loc));
9434 -- If there is a formal subprogram with the same name as the unit
9435 -- itself, do not add this renaming declaration. This is a temporary
9436 -- fix for one ACVC test. ???
9438 Prev_Formal := First_Entity (Pack_Id);
9439 while Present (Prev_Formal) loop
9440 if Chars (Prev_Formal) = Chars (Gen_Unit)
9441 and then Is_Overloadable (Prev_Formal)
9446 Next_Entity (Prev_Formal);
9449 if Present (Prev_Formal) then
9450 Decls := New_List (Act_Body);
9452 Decls := New_List (Unit_Renaming, Act_Body);
9455 -- The subprogram body is placed in the body of a dummy package body,
9456 -- whose spec contains the subprogram declaration as well as the
9457 -- renaming declarations for the generic parameters.
9459 Pack_Body := Make_Package_Body (Loc,
9460 Defining_Unit_Name => New_Copy (Pack_Id),
9461 Declarations => Decls);
9463 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9465 -- If the instantiation is a library unit, then build resulting
9466 -- compilation unit nodes for the instance. The declaration of
9467 -- the enclosing package is the grandparent of the subprogram
9468 -- declaration. First replace the instantiation node as the unit
9469 -- of the corresponding compilation.
9471 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9472 if Parent (Inst_Node) = Cunit (Main_Unit) then
9473 Set_Unit (Parent (Inst_Node), Inst_Node);
9474 Build_Instance_Compilation_Unit_Nodes
9475 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
9476 Analyze (Inst_Node);
9478 Set_Parent (Pack_Body, Parent (Inst_Node));
9479 Analyze (Pack_Body);
9483 Insert_Before (Inst_Node, Pack_Body);
9484 Mark_Rewrite_Insertion (Pack_Body);
9485 Analyze (Pack_Body);
9487 if Expander_Active then
9488 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
9492 Inherit_Context (Gen_Body, Inst_Node);
9494 Restore_Private_Views (Pack_Id, False);
9496 if Parent_Installed then
9497 Remove_Parent (In_Body => True);
9499 -- Restore the previous visibility of the parent
9501 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9505 Style_Check := Save_Style_Check;
9507 -- Body not found. Error was emitted already. If there were no previous
9508 -- errors, this may be an instance whose scope is a premature instance.
9509 -- In that case we must insure that the (legal) program does raise
9510 -- program error if executed. We generate a subprogram body for this
9511 -- purpose. See DEC ac30vso.
9513 -- Should not reference proprietary DEC tests in comments ???
9515 elsif Serious_Errors_Detected = 0
9516 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
9518 if Body_Optional then
9521 elsif Ekind (Anon_Id) = E_Procedure then
9523 Make_Subprogram_Body (Loc,
9525 Make_Procedure_Specification (Loc,
9526 Defining_Unit_Name =>
9527 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9528 Parameter_Specifications =>
9530 (Parameter_Specifications (Parent (Anon_Id)))),
9532 Declarations => Empty_List,
9533 Handled_Statement_Sequence =>
9534 Make_Handled_Sequence_Of_Statements (Loc,
9537 Make_Raise_Program_Error (Loc,
9539 PE_Access_Before_Elaboration))));
9543 Make_Raise_Program_Error (Loc,
9544 Reason => PE_Access_Before_Elaboration);
9546 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
9547 Set_Analyzed (Ret_Expr);
9550 Make_Subprogram_Body (Loc,
9552 Make_Function_Specification (Loc,
9553 Defining_Unit_Name =>
9554 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9555 Parameter_Specifications =>
9557 (Parameter_Specifications (Parent (Anon_Id))),
9558 Result_Definition =>
9559 New_Occurrence_Of (Etype (Anon_Id), Loc)),
9561 Declarations => Empty_List,
9562 Handled_Statement_Sequence =>
9563 Make_Handled_Sequence_Of_Statements (Loc,
9566 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
9569 Pack_Body := Make_Package_Body (Loc,
9570 Defining_Unit_Name => New_Copy (Pack_Id),
9571 Declarations => New_List (Act_Body));
9573 Insert_After (Inst_Node, Pack_Body);
9574 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9575 Analyze (Pack_Body);
9578 Expander_Mode_Restore;
9579 end Instantiate_Subprogram_Body;
9581 ----------------------
9582 -- Instantiate_Type --
9583 ----------------------
9585 function Instantiate_Type
9588 Analyzed_Formal : Node_Id;
9589 Actual_Decls : List_Id) return List_Id
9591 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
9592 A_Gen_T : constant Entity_Id :=
9593 Defining_Identifier (Analyzed_Formal);
9594 Ancestor : Entity_Id := Empty;
9595 Def : constant Node_Id := Formal_Type_Definition (Formal);
9597 Decl_Node : Node_Id;
9598 Decl_Nodes : List_Id;
9602 procedure Validate_Array_Type_Instance;
9603 procedure Validate_Access_Subprogram_Instance;
9604 procedure Validate_Access_Type_Instance;
9605 procedure Validate_Derived_Type_Instance;
9606 procedure Validate_Derived_Interface_Type_Instance;
9607 procedure Validate_Discriminated_Formal_Type;
9608 procedure Validate_Interface_Type_Instance;
9609 procedure Validate_Private_Type_Instance;
9610 procedure Validate_Incomplete_Type_Instance;
9611 -- These procedures perform validation tests for the named case.
9612 -- Validate_Discriminated_Formal_Type is shared by formal private
9613 -- types and Ada 2012 formal incomplete types.
9615 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
9616 -- Check that base types are the same and that the subtypes match
9617 -- statically. Used in several of the above.
9619 --------------------
9620 -- Subtypes_Match --
9621 --------------------
9623 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
9624 T : constant Entity_Id := Get_Instance_Of (Gen_T);
9627 return (Base_Type (T) = Base_Type (Act_T)
9628 and then Subtypes_Statically_Match (T, Act_T))
9630 or else (Is_Class_Wide_Type (Gen_T)
9631 and then Is_Class_Wide_Type (Act_T)
9634 (Get_Instance_Of (Root_Type (Gen_T)),
9638 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
9639 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
9640 and then Ekind (Act_T) = Ekind (Gen_T)
9642 Subtypes_Statically_Match
9643 (Designated_Type (Gen_T), Designated_Type (Act_T)));
9646 -----------------------------------------
9647 -- Validate_Access_Subprogram_Instance --
9648 -----------------------------------------
9650 procedure Validate_Access_Subprogram_Instance is
9652 if not Is_Access_Type (Act_T)
9653 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
9656 ("expect access type in instantiation of &", Actual, Gen_T);
9657 Abandon_Instantiation (Actual);
9660 Check_Mode_Conformant
9661 (Designated_Type (Act_T),
9662 Designated_Type (A_Gen_T),
9666 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
9667 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
9669 ("protected access type not allowed for formal &",
9673 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
9675 ("expect protected access type for formal &",
9678 end Validate_Access_Subprogram_Instance;
9680 -----------------------------------
9681 -- Validate_Access_Type_Instance --
9682 -----------------------------------
9684 procedure Validate_Access_Type_Instance is
9685 Desig_Type : constant Entity_Id :=
9686 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
9687 Desig_Act : Entity_Id;
9690 if not Is_Access_Type (Act_T) then
9692 ("expect access type in instantiation of &", Actual, Gen_T);
9693 Abandon_Instantiation (Actual);
9696 if Is_Access_Constant (A_Gen_T) then
9697 if not Is_Access_Constant (Act_T) then
9699 ("actual type must be access-to-constant type", Actual);
9700 Abandon_Instantiation (Actual);
9703 if Is_Access_Constant (Act_T) then
9705 ("actual type must be access-to-variable type", Actual);
9706 Abandon_Instantiation (Actual);
9708 elsif Ekind (A_Gen_T) = E_General_Access_Type
9709 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
9711 Error_Msg_N -- CODEFIX
9712 ("actual must be general access type!", Actual);
9713 Error_Msg_NE -- CODEFIX
9714 ("add ALL to }!", Actual, Act_T);
9715 Abandon_Instantiation (Actual);
9719 -- The designated subtypes, that is to say the subtypes introduced
9720 -- by an access type declaration (and not by a subtype declaration)
9723 Desig_Act := Designated_Type (Base_Type (Act_T));
9725 -- The designated type may have been introduced through a limited_
9726 -- with clause, in which case retrieve the non-limited view. This
9727 -- applies to incomplete types as well as to class-wide types.
9729 if From_With_Type (Desig_Act) then
9730 Desig_Act := Available_View (Desig_Act);
9733 if not Subtypes_Match
9734 (Desig_Type, Desig_Act) then
9736 ("designated type of actual does not match that of formal &",
9738 Abandon_Instantiation (Actual);
9740 elsif Is_Access_Type (Designated_Type (Act_T))
9741 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
9743 Is_Constrained (Designated_Type (Desig_Type))
9746 ("designated type of actual does not match that of formal &",
9748 Abandon_Instantiation (Actual);
9751 -- Ada 2005: null-exclusion indicators of the two types must agree
9753 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
9755 ("non null exclusion of actual and formal & do not match",
9758 end Validate_Access_Type_Instance;
9760 ----------------------------------
9761 -- Validate_Array_Type_Instance --
9762 ----------------------------------
9764 procedure Validate_Array_Type_Instance is
9769 function Formal_Dimensions return Int;
9770 -- Count number of dimensions in array type formal
9772 -----------------------
9773 -- Formal_Dimensions --
9774 -----------------------
9776 function Formal_Dimensions return Int is
9781 if Nkind (Def) = N_Constrained_Array_Definition then
9782 Index := First (Discrete_Subtype_Definitions (Def));
9784 Index := First (Subtype_Marks (Def));
9787 while Present (Index) loop
9793 end Formal_Dimensions;
9795 -- Start of processing for Validate_Array_Type_Instance
9798 if not Is_Array_Type (Act_T) then
9800 ("expect array type in instantiation of &", Actual, Gen_T);
9801 Abandon_Instantiation (Actual);
9803 elsif Nkind (Def) = N_Constrained_Array_Definition then
9804 if not (Is_Constrained (Act_T)) then
9806 ("expect constrained array in instantiation of &",
9808 Abandon_Instantiation (Actual);
9812 if Is_Constrained (Act_T) then
9814 ("expect unconstrained array in instantiation of &",
9816 Abandon_Instantiation (Actual);
9820 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9822 ("dimensions of actual do not match formal &", Actual, Gen_T);
9823 Abandon_Instantiation (Actual);
9826 I1 := First_Index (A_Gen_T);
9827 I2 := First_Index (Act_T);
9828 for J in 1 .. Formal_Dimensions loop
9830 -- If the indexes of the actual were given by a subtype_mark,
9831 -- the index was transformed into a range attribute. Retrieve
9832 -- the original type mark for checking.
9834 if Is_Entity_Name (Original_Node (I2)) then
9835 T2 := Entity (Original_Node (I2));
9840 if not Subtypes_Match
9841 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
9844 ("index types of actual do not match those of formal &",
9846 Abandon_Instantiation (Actual);
9853 -- Check matching subtypes. Note that there are complex visibility
9854 -- issues when the generic is a child unit and some aspect of the
9855 -- generic type is declared in a parent unit of the generic. We do
9856 -- the test to handle this special case only after a direct check
9857 -- for static matching has failed.
9860 (Component_Type (A_Gen_T), Component_Type (Act_T))
9861 or else Subtypes_Match
9862 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
9863 Component_Type (Act_T))
9868 ("component subtype of actual does not match that of formal &",
9870 Abandon_Instantiation (Actual);
9873 if Has_Aliased_Components (A_Gen_T)
9874 and then not Has_Aliased_Components (Act_T)
9877 ("actual must have aliased components to match formal type &",
9880 end Validate_Array_Type_Instance;
9882 -----------------------------------------------
9883 -- Validate_Derived_Interface_Type_Instance --
9884 -----------------------------------------------
9886 procedure Validate_Derived_Interface_Type_Instance is
9887 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9891 -- First apply interface instance checks
9893 Validate_Interface_Type_Instance;
9895 -- Verify that immediate parent interface is an ancestor of
9899 and then not Interface_Present_In_Ancestor (Act_T, Par)
9902 ("interface actual must include progenitor&", Actual, Par);
9905 -- Now verify that the actual includes all other ancestors of
9908 Elmt := First_Elmt (Interfaces (A_Gen_T));
9909 while Present (Elmt) loop
9910 if not Interface_Present_In_Ancestor
9911 (Act_T, Get_Instance_Of (Node (Elmt)))
9914 ("interface actual must include progenitor&",
9915 Actual, Node (Elmt));
9920 end Validate_Derived_Interface_Type_Instance;
9922 ------------------------------------
9923 -- Validate_Derived_Type_Instance --
9924 ------------------------------------
9926 procedure Validate_Derived_Type_Instance is
9927 Actual_Discr : Entity_Id;
9928 Ancestor_Discr : Entity_Id;
9931 -- If the parent type in the generic declaration is itself a previous
9932 -- formal type, then it is local to the generic and absent from the
9933 -- analyzed generic definition. In that case the ancestor is the
9934 -- instance of the formal (which must have been instantiated
9935 -- previously), unless the ancestor is itself a formal derived type.
9936 -- In this latter case (which is the subject of Corrigendum 8652/0038
9937 -- (AI-202) the ancestor of the formals is the ancestor of its
9938 -- parent. Otherwise, the analyzed generic carries the parent type.
9939 -- If the parent type is defined in a previous formal package, then
9940 -- the scope of that formal package is that of the generic type
9941 -- itself, and it has already been mapped into the corresponding type
9942 -- in the actual package.
9944 -- Common case: parent type defined outside of the generic
9946 if Is_Entity_Name (Subtype_Mark (Def))
9947 and then Present (Entity (Subtype_Mark (Def)))
9949 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9951 -- Check whether parent is defined in a previous formal package
9954 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9957 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9959 -- The type may be a local derivation, or a type extension of a
9960 -- previous formal, or of a formal of a parent package.
9962 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9964 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9966 -- Check whether the parent is another derived formal type in the
9967 -- same generic unit.
9969 if Etype (A_Gen_T) /= A_Gen_T
9970 and then Is_Generic_Type (Etype (A_Gen_T))
9971 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9972 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9974 -- Locate ancestor of parent from the subtype declaration
9975 -- created for the actual.
9981 Decl := First (Actual_Decls);
9982 while Present (Decl) loop
9983 if Nkind (Decl) = N_Subtype_Declaration
9984 and then Chars (Defining_Identifier (Decl)) =
9985 Chars (Etype (A_Gen_T))
9987 Ancestor := Generic_Parent_Type (Decl);
9995 pragma Assert (Present (Ancestor));
9999 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
10003 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
10006 -- If the formal derived type has pragma Preelaborable_Initialization
10007 -- then the actual type must have preelaborable initialization.
10009 if Known_To_Have_Preelab_Init (A_Gen_T)
10010 and then not Has_Preelaborable_Initialization (Act_T)
10013 ("actual for & must have preelaborable initialization",
10017 -- Ada 2005 (AI-251)
10019 if Ada_Version >= Ada_2005
10020 and then Is_Interface (Ancestor)
10022 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
10024 ("(Ada 2005) expected type implementing & in instantiation",
10028 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
10030 ("expect type derived from & in instantiation",
10031 Actual, First_Subtype (Ancestor));
10032 Abandon_Instantiation (Actual);
10035 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
10036 -- that the formal type declaration has been rewritten as a private
10039 if Ada_Version >= Ada_2005
10040 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
10041 and then Synchronized_Present (Parent (A_Gen_T))
10043 -- The actual must be a synchronized tagged type
10045 if not Is_Tagged_Type (Act_T) then
10047 ("actual of synchronized type must be tagged", Actual);
10048 Abandon_Instantiation (Actual);
10050 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
10051 and then Nkind (Type_Definition (Parent (Act_T))) =
10052 N_Derived_Type_Definition
10053 and then not Synchronized_Present (Type_Definition
10057 ("actual of synchronized type must be synchronized", Actual);
10058 Abandon_Instantiation (Actual);
10062 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
10063 -- removes the second instance of the phrase "or allow pass by copy".
10065 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
10067 ("cannot have atomic actual type for non-atomic formal type",
10070 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
10072 ("cannot have volatile actual type for non-volatile formal type",
10076 -- It should not be necessary to check for unknown discriminants on
10077 -- Formal, but for some reason Has_Unknown_Discriminants is false for
10078 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
10079 -- needs fixing. ???
10081 if not Is_Indefinite_Subtype (A_Gen_T)
10082 and then not Unknown_Discriminants_Present (Formal)
10083 and then Is_Indefinite_Subtype (Act_T)
10086 ("actual subtype must be constrained", Actual);
10087 Abandon_Instantiation (Actual);
10090 if not Unknown_Discriminants_Present (Formal) then
10091 if Is_Constrained (Ancestor) then
10092 if not Is_Constrained (Act_T) then
10094 ("actual subtype must be constrained", Actual);
10095 Abandon_Instantiation (Actual);
10098 -- Ancestor is unconstrained, Check if generic formal and actual
10099 -- agree on constrainedness. The check only applies to array types
10100 -- and discriminated types.
10102 elsif Is_Constrained (Act_T) then
10103 if Ekind (Ancestor) = E_Access_Type
10105 (not Is_Constrained (A_Gen_T)
10106 and then Is_Composite_Type (A_Gen_T))
10109 ("actual subtype must be unconstrained", Actual);
10110 Abandon_Instantiation (Actual);
10113 -- A class-wide type is only allowed if the formal has unknown
10116 elsif Is_Class_Wide_Type (Act_T)
10117 and then not Has_Unknown_Discriminants (Ancestor)
10120 ("actual for & cannot be a class-wide type", Actual, Gen_T);
10121 Abandon_Instantiation (Actual);
10123 -- Otherwise, the formal and actual shall have the same number
10124 -- of discriminants and each discriminant of the actual must
10125 -- correspond to a discriminant of the formal.
10127 elsif Has_Discriminants (Act_T)
10128 and then not Has_Unknown_Discriminants (Act_T)
10129 and then Has_Discriminants (Ancestor)
10131 Actual_Discr := First_Discriminant (Act_T);
10132 Ancestor_Discr := First_Discriminant (Ancestor);
10133 while Present (Actual_Discr)
10134 and then Present (Ancestor_Discr)
10136 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
10137 No (Corresponding_Discriminant (Actual_Discr))
10140 ("discriminant & does not correspond " &
10141 "to ancestor discriminant", Actual, Actual_Discr);
10142 Abandon_Instantiation (Actual);
10145 Next_Discriminant (Actual_Discr);
10146 Next_Discriminant (Ancestor_Discr);
10149 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
10151 ("actual for & must have same number of discriminants",
10153 Abandon_Instantiation (Actual);
10156 -- This case should be caught by the earlier check for
10157 -- constrainedness, but the check here is added for completeness.
10159 elsif Has_Discriminants (Act_T)
10160 and then not Has_Unknown_Discriminants (Act_T)
10163 ("actual for & must not have discriminants", Actual, Gen_T);
10164 Abandon_Instantiation (Actual);
10166 elsif Has_Discriminants (Ancestor) then
10168 ("actual for & must have known discriminants", Actual, Gen_T);
10169 Abandon_Instantiation (Actual);
10172 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
10174 ("constraint on actual is incompatible with formal", Actual);
10175 Abandon_Instantiation (Actual);
10179 -- If the formal and actual types are abstract, check that there
10180 -- are no abstract primitives of the actual type that correspond to
10181 -- nonabstract primitives of the formal type (second sentence of
10184 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
10185 Check_Abstract_Primitives : declare
10186 Gen_Prims : constant Elist_Id :=
10187 Primitive_Operations (A_Gen_T);
10188 Gen_Elmt : Elmt_Id;
10189 Gen_Subp : Entity_Id;
10190 Anc_Subp : Entity_Id;
10191 Anc_Formal : Entity_Id;
10192 Anc_F_Type : Entity_Id;
10194 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
10195 Act_Elmt : Elmt_Id;
10196 Act_Subp : Entity_Id;
10197 Act_Formal : Entity_Id;
10198 Act_F_Type : Entity_Id;
10200 Subprograms_Correspond : Boolean;
10202 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
10203 -- Returns true if T2 is derived directly or indirectly from
10204 -- T1, including derivations from interfaces. T1 and T2 are
10205 -- required to be specific tagged base types.
10207 ------------------------
10208 -- Is_Tagged_Ancestor --
10209 ------------------------
10211 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
10213 Intfc_Elmt : Elmt_Id;
10216 -- The predicate is satisfied if the types are the same
10221 -- If we've reached the top of the derivation chain then
10222 -- we know that T1 is not an ancestor of T2.
10224 elsif Etype (T2) = T2 then
10227 -- Proceed to check T2's immediate parent
10229 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
10232 -- Finally, check to see if T1 is an ancestor of any of T2's
10236 Intfc_Elmt := First_Elmt (Interfaces (T2));
10237 while Present (Intfc_Elmt) loop
10238 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
10242 Next_Elmt (Intfc_Elmt);
10247 end Is_Tagged_Ancestor;
10249 -- Start of processing for Check_Abstract_Primitives
10252 -- Loop over all of the formal derived type's primitives
10254 Gen_Elmt := First_Elmt (Gen_Prims);
10255 while Present (Gen_Elmt) loop
10256 Gen_Subp := Node (Gen_Elmt);
10258 -- If the primitive of the formal is not abstract, then
10259 -- determine whether there is a corresponding primitive of
10260 -- the actual type that's abstract.
10262 if not Is_Abstract_Subprogram (Gen_Subp) then
10263 Act_Elmt := First_Elmt (Act_Prims);
10264 while Present (Act_Elmt) loop
10265 Act_Subp := Node (Act_Elmt);
10267 -- If we find an abstract primitive of the actual,
10268 -- then we need to test whether it corresponds to the
10269 -- subprogram from which the generic formal primitive
10272 if Is_Abstract_Subprogram (Act_Subp) then
10273 Anc_Subp := Alias (Gen_Subp);
10275 -- Test whether we have a corresponding primitive
10276 -- by comparing names, kinds, formal types, and
10279 if Chars (Anc_Subp) = Chars (Act_Subp)
10280 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
10282 Anc_Formal := First_Formal (Anc_Subp);
10283 Act_Formal := First_Formal (Act_Subp);
10284 while Present (Anc_Formal)
10285 and then Present (Act_Formal)
10287 Anc_F_Type := Etype (Anc_Formal);
10288 Act_F_Type := Etype (Act_Formal);
10290 if Ekind (Anc_F_Type)
10291 = E_Anonymous_Access_Type
10293 Anc_F_Type := Designated_Type (Anc_F_Type);
10295 if Ekind (Act_F_Type)
10296 = E_Anonymous_Access_Type
10299 Designated_Type (Act_F_Type);
10305 Ekind (Act_F_Type) = E_Anonymous_Access_Type
10310 Anc_F_Type := Base_Type (Anc_F_Type);
10311 Act_F_Type := Base_Type (Act_F_Type);
10313 -- If the formal is controlling, then the
10314 -- the type of the actual primitive's formal
10315 -- must be derived directly or indirectly
10316 -- from the type of the ancestor primitive's
10319 if Is_Controlling_Formal (Anc_Formal) then
10320 if not Is_Tagged_Ancestor
10321 (Anc_F_Type, Act_F_Type)
10326 -- Otherwise the types of the formals must
10329 elsif Anc_F_Type /= Act_F_Type then
10333 Next_Entity (Anc_Formal);
10334 Next_Entity (Act_Formal);
10337 -- If we traversed through all of the formals
10338 -- then so far the subprograms correspond, so
10339 -- now check that any result types correspond.
10341 if No (Anc_Formal) and then No (Act_Formal) then
10342 Subprograms_Correspond := True;
10344 if Ekind (Act_Subp) = E_Function then
10345 Anc_F_Type := Etype (Anc_Subp);
10346 Act_F_Type := Etype (Act_Subp);
10348 if Ekind (Anc_F_Type)
10349 = E_Anonymous_Access_Type
10352 Designated_Type (Anc_F_Type);
10354 if Ekind (Act_F_Type)
10355 = E_Anonymous_Access_Type
10358 Designated_Type (Act_F_Type);
10360 Subprograms_Correspond := False;
10365 = E_Anonymous_Access_Type
10367 Subprograms_Correspond := False;
10370 Anc_F_Type := Base_Type (Anc_F_Type);
10371 Act_F_Type := Base_Type (Act_F_Type);
10373 -- Now either the result types must be
10374 -- the same or, if the result type is
10375 -- controlling, the result type of the
10376 -- actual primitive must descend from the
10377 -- result type of the ancestor primitive.
10379 if Subprograms_Correspond
10380 and then Anc_F_Type /= Act_F_Type
10382 Has_Controlling_Result (Anc_Subp)
10384 not Is_Tagged_Ancestor
10385 (Anc_F_Type, Act_F_Type)
10387 Subprograms_Correspond := False;
10391 -- Found a matching subprogram belonging to
10392 -- formal ancestor type, so actual subprogram
10393 -- corresponds and this violates 3.9.3(9).
10395 if Subprograms_Correspond then
10397 ("abstract subprogram & overrides " &
10398 "nonabstract subprogram of ancestor",
10406 Next_Elmt (Act_Elmt);
10410 Next_Elmt (Gen_Elmt);
10412 end Check_Abstract_Primitives;
10415 -- Verify that limitedness matches. If parent is a limited
10416 -- interface then the generic formal is not unless declared
10417 -- explicitly so. If not declared limited, the actual cannot be
10418 -- limited (see AI05-0087).
10420 -- Even though this AI is a binding interpretation, we enable the
10421 -- check only in Ada 2012 mode, because this improper construct
10422 -- shows up in user code and in existing B-tests.
10424 if Is_Limited_Type (Act_T)
10425 and then not Is_Limited_Type (A_Gen_T)
10426 and then Ada_Version >= Ada_2012
10428 if In_Instance then
10432 ("actual for non-limited & cannot be a limited type", Actual,
10434 Explain_Limited_Type (Act_T, Actual);
10435 Abandon_Instantiation (Actual);
10438 end Validate_Derived_Type_Instance;
10440 ----------------------------------------
10441 -- Validate_Discriminated_Formal_Type --
10442 ----------------------------------------
10444 procedure Validate_Discriminated_Formal_Type is
10445 Formal_Discr : Entity_Id;
10446 Actual_Discr : Entity_Id;
10447 Formal_Subt : Entity_Id;
10450 if Has_Discriminants (A_Gen_T) then
10451 if not Has_Discriminants (Act_T) then
10453 ("actual for & must have discriminants", Actual, Gen_T);
10454 Abandon_Instantiation (Actual);
10456 elsif Is_Constrained (Act_T) then
10458 ("actual for & must be unconstrained", Actual, Gen_T);
10459 Abandon_Instantiation (Actual);
10462 Formal_Discr := First_Discriminant (A_Gen_T);
10463 Actual_Discr := First_Discriminant (Act_T);
10464 while Formal_Discr /= Empty loop
10465 if Actual_Discr = Empty then
10467 ("discriminants on actual do not match formal",
10469 Abandon_Instantiation (Actual);
10472 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
10474 -- Access discriminants match if designated types do
10476 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
10477 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
10478 E_Anonymous_Access_Type
10481 (Designated_Type (Base_Type (Formal_Subt))) =
10482 Designated_Type (Base_Type (Etype (Actual_Discr)))
10486 elsif Base_Type (Formal_Subt) /=
10487 Base_Type (Etype (Actual_Discr))
10490 ("types of actual discriminants must match formal",
10492 Abandon_Instantiation (Actual);
10494 elsif not Subtypes_Statically_Match
10495 (Formal_Subt, Etype (Actual_Discr))
10496 and then Ada_Version >= Ada_95
10499 ("subtypes of actual discriminants must match formal",
10501 Abandon_Instantiation (Actual);
10504 Next_Discriminant (Formal_Discr);
10505 Next_Discriminant (Actual_Discr);
10508 if Actual_Discr /= Empty then
10510 ("discriminants on actual do not match formal",
10512 Abandon_Instantiation (Actual);
10516 end Validate_Discriminated_Formal_Type;
10518 ---------------------------------------
10519 -- Validate_Incomplete_Type_Instance --
10520 ---------------------------------------
10522 procedure Validate_Incomplete_Type_Instance is
10524 if not Is_Tagged_Type (Act_T)
10525 and then Is_Tagged_Type (A_Gen_T)
10528 ("actual for & must be a tagged type", Actual, Gen_T);
10531 Validate_Discriminated_Formal_Type;
10532 end Validate_Incomplete_Type_Instance;
10534 --------------------------------------
10535 -- Validate_Interface_Type_Instance --
10536 --------------------------------------
10538 procedure Validate_Interface_Type_Instance is
10540 if not Is_Interface (Act_T) then
10542 ("actual for formal interface type must be an interface",
10545 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
10547 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
10549 Is_Protected_Interface (A_Gen_T) /=
10550 Is_Protected_Interface (Act_T)
10552 Is_Synchronized_Interface (A_Gen_T) /=
10553 Is_Synchronized_Interface (Act_T)
10556 ("actual for interface& does not match (RM 12.5.5(4))",
10559 end Validate_Interface_Type_Instance;
10561 ------------------------------------
10562 -- Validate_Private_Type_Instance --
10563 ------------------------------------
10565 procedure Validate_Private_Type_Instance is
10567 if Is_Limited_Type (Act_T)
10568 and then not Is_Limited_Type (A_Gen_T)
10570 if In_Instance then
10574 ("actual for non-limited & cannot be a limited type", Actual,
10576 Explain_Limited_Type (Act_T, Actual);
10577 Abandon_Instantiation (Actual);
10580 elsif Known_To_Have_Preelab_Init (A_Gen_T)
10581 and then not Has_Preelaborable_Initialization (Act_T)
10584 ("actual for & must have preelaborable initialization", Actual,
10587 elsif Is_Indefinite_Subtype (Act_T)
10588 and then not Is_Indefinite_Subtype (A_Gen_T)
10589 and then Ada_Version >= Ada_95
10592 ("actual for & must be a definite subtype", Actual, Gen_T);
10594 elsif not Is_Tagged_Type (Act_T)
10595 and then Is_Tagged_Type (A_Gen_T)
10598 ("actual for & must be a tagged type", Actual, Gen_T);
10601 Validate_Discriminated_Formal_Type;
10603 end Validate_Private_Type_Instance;
10605 -- Start of processing for Instantiate_Type
10608 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
10609 Error_Msg_N ("duplicate instantiation of generic type", Actual);
10610 return New_List (Error);
10612 elsif not Is_Entity_Name (Actual)
10613 or else not Is_Type (Entity (Actual))
10616 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
10617 Abandon_Instantiation (Actual);
10620 Act_T := Entity (Actual);
10622 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
10623 -- as a generic actual parameter if the corresponding formal type
10624 -- does not have a known_discriminant_part, or is a formal derived
10625 -- type that is an Unchecked_Union type.
10627 if Is_Unchecked_Union (Base_Type (Act_T)) then
10628 if not Has_Discriminants (A_Gen_T)
10630 (Is_Derived_Type (A_Gen_T)
10632 Is_Unchecked_Union (A_Gen_T))
10636 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
10637 " discriminated formal type", Act_T);
10642 -- Deal with fixed/floating restrictions
10644 if Is_Floating_Point_Type (Act_T) then
10645 Check_Restriction (No_Floating_Point, Actual);
10646 elsif Is_Fixed_Point_Type (Act_T) then
10647 Check_Restriction (No_Fixed_Point, Actual);
10650 -- Deal with error of using incomplete type as generic actual.
10651 -- This includes limited views of a type, even if the non-limited
10652 -- view may be available.
10654 if Ekind (Act_T) = E_Incomplete_Type
10655 or else (Is_Class_Wide_Type (Act_T)
10657 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
10659 -- If the formal is an incomplete type, the actual can be
10660 -- incomplete as well.
10662 if Ekind (A_Gen_T) = E_Incomplete_Type then
10665 elsif Is_Class_Wide_Type (Act_T)
10666 or else No (Full_View (Act_T))
10668 Error_Msg_N ("premature use of incomplete type", Actual);
10669 Abandon_Instantiation (Actual);
10671 Act_T := Full_View (Act_T);
10672 Set_Entity (Actual, Act_T);
10674 if Has_Private_Component (Act_T) then
10676 ("premature use of type with private component", Actual);
10680 -- Deal with error of premature use of private type as generic actual
10682 elsif Is_Private_Type (Act_T)
10683 and then Is_Private_Type (Base_Type (Act_T))
10684 and then not Is_Generic_Type (Act_T)
10685 and then not Is_Derived_Type (Act_T)
10686 and then No (Full_View (Root_Type (Act_T)))
10688 -- If the formal is an incomplete type, the actual can be
10689 -- private or incomplete as well.
10691 if Ekind (A_Gen_T) = E_Incomplete_Type then
10694 Error_Msg_N ("premature use of private type", Actual);
10697 elsif Has_Private_Component (Act_T) then
10699 ("premature use of type with private component", Actual);
10702 Set_Instance_Of (A_Gen_T, Act_T);
10704 -- If the type is generic, the class-wide type may also be used
10706 if Is_Tagged_Type (A_Gen_T)
10707 and then Is_Tagged_Type (Act_T)
10708 and then not Is_Class_Wide_Type (A_Gen_T)
10710 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
10711 Class_Wide_Type (Act_T));
10714 if not Is_Abstract_Type (A_Gen_T)
10715 and then Is_Abstract_Type (Act_T)
10718 ("actual of non-abstract formal cannot be abstract", Actual);
10721 -- A generic scalar type is a first subtype for which we generate
10722 -- an anonymous base type. Indicate that the instance of this base
10723 -- is the base type of the actual.
10725 if Is_Scalar_Type (A_Gen_T) then
10726 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
10730 if Error_Posted (Act_T) then
10733 case Nkind (Def) is
10734 when N_Formal_Private_Type_Definition =>
10735 Validate_Private_Type_Instance;
10737 when N_Formal_Incomplete_Type_Definition =>
10738 Validate_Incomplete_Type_Instance;
10740 when N_Formal_Derived_Type_Definition =>
10741 Validate_Derived_Type_Instance;
10743 when N_Formal_Discrete_Type_Definition =>
10744 if not Is_Discrete_Type (Act_T) then
10746 ("expect discrete type in instantiation of&",
10748 Abandon_Instantiation (Actual);
10751 when N_Formal_Signed_Integer_Type_Definition =>
10752 if not Is_Signed_Integer_Type (Act_T) then
10754 ("expect signed integer type in instantiation of&",
10756 Abandon_Instantiation (Actual);
10759 when N_Formal_Modular_Type_Definition =>
10760 if not Is_Modular_Integer_Type (Act_T) then
10762 ("expect modular type in instantiation of &",
10764 Abandon_Instantiation (Actual);
10767 when N_Formal_Floating_Point_Definition =>
10768 if not Is_Floating_Point_Type (Act_T) then
10770 ("expect float type in instantiation of &", Actual, Gen_T);
10771 Abandon_Instantiation (Actual);
10774 when N_Formal_Ordinary_Fixed_Point_Definition =>
10775 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
10777 ("expect ordinary fixed point type in instantiation of &",
10779 Abandon_Instantiation (Actual);
10782 when N_Formal_Decimal_Fixed_Point_Definition =>
10783 if not Is_Decimal_Fixed_Point_Type (Act_T) then
10785 ("expect decimal type in instantiation of &",
10787 Abandon_Instantiation (Actual);
10790 when N_Array_Type_Definition =>
10791 Validate_Array_Type_Instance;
10793 when N_Access_To_Object_Definition =>
10794 Validate_Access_Type_Instance;
10796 when N_Access_Function_Definition |
10797 N_Access_Procedure_Definition =>
10798 Validate_Access_Subprogram_Instance;
10800 when N_Record_Definition =>
10801 Validate_Interface_Type_Instance;
10803 when N_Derived_Type_Definition =>
10804 Validate_Derived_Interface_Type_Instance;
10807 raise Program_Error;
10812 Subt := New_Copy (Gen_T);
10814 -- Use adjusted sloc of subtype name as the location for other nodes in
10815 -- the subtype declaration.
10817 Loc := Sloc (Subt);
10820 Make_Subtype_Declaration (Loc,
10821 Defining_Identifier => Subt,
10822 Subtype_Indication => New_Reference_To (Act_T, Loc));
10824 if Is_Private_Type (Act_T) then
10825 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10827 elsif Is_Access_Type (Act_T)
10828 and then Is_Private_Type (Designated_Type (Act_T))
10830 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10833 Decl_Nodes := New_List (Decl_Node);
10835 -- Flag actual derived types so their elaboration produces the
10836 -- appropriate renamings for the primitive operations of the ancestor.
10837 -- Flag actual for formal private types as well, to determine whether
10838 -- operations in the private part may override inherited operations.
10839 -- If the formal has an interface list, the ancestor is not the
10840 -- parent, but the analyzed formal that includes the interface
10841 -- operations of all its progenitors.
10843 -- Same treatment for formal private types, so we can check whether the
10844 -- type is tagged limited when validating derivations in the private
10845 -- part. (See AI05-096).
10847 if Nkind (Def) = N_Formal_Derived_Type_Definition then
10848 if Present (Interface_List (Def)) then
10849 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10851 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10854 elsif Nkind_In (Def,
10855 N_Formal_Private_Type_Definition,
10856 N_Formal_Incomplete_Type_Definition)
10858 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10861 -- If the actual is a synchronized type that implements an interface,
10862 -- the primitive operations are attached to the corresponding record,
10863 -- and we have to treat it as an additional generic actual, so that its
10864 -- primitive operations become visible in the instance. The task or
10865 -- protected type itself does not carry primitive operations.
10867 if Is_Concurrent_Type (Act_T)
10868 and then Is_Tagged_Type (Act_T)
10869 and then Present (Corresponding_Record_Type (Act_T))
10870 and then Present (Ancestor)
10871 and then Is_Interface (Ancestor)
10874 Corr_Rec : constant Entity_Id :=
10875 Corresponding_Record_Type (Act_T);
10876 New_Corr : Entity_Id;
10877 Corr_Decl : Node_Id;
10880 New_Corr := Make_Temporary (Loc, 'S');
10882 Make_Subtype_Declaration (Loc,
10883 Defining_Identifier => New_Corr,
10884 Subtype_Indication =>
10885 New_Reference_To (Corr_Rec, Loc));
10886 Append_To (Decl_Nodes, Corr_Decl);
10888 if Ekind (Act_T) = E_Task_Type then
10889 Set_Ekind (Subt, E_Task_Subtype);
10891 Set_Ekind (Subt, E_Protected_Subtype);
10894 Set_Corresponding_Record_Type (Subt, Corr_Rec);
10895 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
10896 Set_Generic_Parent_Type (Decl_Node, Empty);
10901 end Instantiate_Type;
10903 ---------------------
10904 -- Is_In_Main_Unit --
10905 ---------------------
10907 function Is_In_Main_Unit (N : Node_Id) return Boolean is
10908 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
10909 Current_Unit : Node_Id;
10912 if Unum = Main_Unit then
10915 -- If the current unit is a subunit then it is either the main unit or
10916 -- is being compiled as part of the main unit.
10918 elsif Nkind (N) = N_Compilation_Unit then
10919 return Nkind (Unit (N)) = N_Subunit;
10922 Current_Unit := Parent (N);
10923 while Present (Current_Unit)
10924 and then Nkind (Current_Unit) /= N_Compilation_Unit
10926 Current_Unit := Parent (Current_Unit);
10929 -- The instantiation node is in the main unit, or else the current node
10930 -- (perhaps as the result of nested instantiations) is in the main unit,
10931 -- or in the declaration of the main unit, which in this last case must
10934 return Unum = Main_Unit
10935 or else Current_Unit = Cunit (Main_Unit)
10936 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
10937 or else (Present (Library_Unit (Current_Unit))
10938 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
10939 end Is_In_Main_Unit;
10941 ----------------------------
10942 -- Load_Parent_Of_Generic --
10943 ----------------------------
10945 procedure Load_Parent_Of_Generic
10948 Body_Optional : Boolean := False)
10950 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
10951 Save_Style_Check : constant Boolean := Style_Check;
10952 True_Parent : Node_Id;
10953 Inst_Node : Node_Id;
10955 Previous_Instances : constant Elist_Id := New_Elmt_List;
10957 procedure Collect_Previous_Instances (Decls : List_Id);
10958 -- Collect all instantiations in the given list of declarations, that
10959 -- precede the generic that we need to load. If the bodies of these
10960 -- instantiations are available, we must analyze them, to ensure that
10961 -- the public symbols generated are the same when the unit is compiled
10962 -- to generate code, and when it is compiled in the context of a unit
10963 -- that needs a particular nested instance. This process is applied to
10964 -- both package and subprogram instances.
10966 --------------------------------
10967 -- Collect_Previous_Instances --
10968 --------------------------------
10970 procedure Collect_Previous_Instances (Decls : List_Id) is
10974 Decl := First (Decls);
10975 while Present (Decl) loop
10976 if Sloc (Decl) >= Sloc (Inst_Node) then
10979 -- If Decl is an instantiation, then record it as requiring
10980 -- instantiation of the corresponding body, except if it is an
10981 -- abbreviated instantiation generated internally for conformance
10982 -- checking purposes only for the case of a formal package
10983 -- declared without a box (see Instantiate_Formal_Package). Such
10984 -- an instantiation does not generate any code (the actual code
10985 -- comes from actual) and thus does not need to be analyzed here.
10986 -- If the instantiation appears with a generic package body it is
10987 -- not analyzed here either.
10989 elsif Nkind (Decl) = N_Package_Instantiation
10990 and then not Is_Internal (Defining_Entity (Decl))
10992 Append_Elmt (Decl, Previous_Instances);
10994 -- For a subprogram instantiation, omit instantiations intrinsic
10995 -- operations (Unchecked_Conversions, etc.) that have no bodies.
10997 elsif Nkind_In (Decl, N_Function_Instantiation,
10998 N_Procedure_Instantiation)
10999 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
11001 Append_Elmt (Decl, Previous_Instances);
11003 elsif Nkind (Decl) = N_Package_Declaration then
11004 Collect_Previous_Instances
11005 (Visible_Declarations (Specification (Decl)));
11006 Collect_Previous_Instances
11007 (Private_Declarations (Specification (Decl)));
11009 -- Previous non-generic bodies may contain instances as well
11011 elsif Nkind (Decl) = N_Package_Body
11012 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
11014 Collect_Previous_Instances (Declarations (Decl));
11016 elsif Nkind (Decl) = N_Subprogram_Body
11017 and then not Acts_As_Spec (Decl)
11018 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
11020 Collect_Previous_Instances (Declarations (Decl));
11025 end Collect_Previous_Instances;
11027 -- Start of processing for Load_Parent_Of_Generic
11030 if not In_Same_Source_Unit (N, Spec)
11031 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
11032 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
11033 and then not Is_In_Main_Unit (Spec))
11035 -- Find body of parent of spec, and analyze it. A special case arises
11036 -- when the parent is an instantiation, that is to say when we are
11037 -- currently instantiating a nested generic. In that case, there is
11038 -- no separate file for the body of the enclosing instance. Instead,
11039 -- the enclosing body must be instantiated as if it were a pending
11040 -- instantiation, in order to produce the body for the nested generic
11041 -- we require now. Note that in that case the generic may be defined
11042 -- in a package body, the instance defined in the same package body,
11043 -- and the original enclosing body may not be in the main unit.
11045 Inst_Node := Empty;
11047 True_Parent := Parent (Spec);
11048 while Present (True_Parent)
11049 and then Nkind (True_Parent) /= N_Compilation_Unit
11051 if Nkind (True_Parent) = N_Package_Declaration
11053 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
11055 -- Parent is a compilation unit that is an instantiation.
11056 -- Instantiation node has been replaced with package decl.
11058 Inst_Node := Original_Node (True_Parent);
11061 elsif Nkind (True_Parent) = N_Package_Declaration
11062 and then Present (Generic_Parent (Specification (True_Parent)))
11063 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11065 -- Parent is an instantiation within another specification.
11066 -- Declaration for instance has been inserted before original
11067 -- instantiation node. A direct link would be preferable?
11069 Inst_Node := Next (True_Parent);
11070 while Present (Inst_Node)
11071 and then Nkind (Inst_Node) /= N_Package_Instantiation
11076 -- If the instance appears within a generic, and the generic
11077 -- unit is defined within a formal package of the enclosing
11078 -- generic, there is no generic body available, and none
11079 -- needed. A more precise test should be used ???
11081 if No (Inst_Node) then
11088 True_Parent := Parent (True_Parent);
11092 -- Case where we are currently instantiating a nested generic
11094 if Present (Inst_Node) then
11095 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
11097 -- Instantiation node and declaration of instantiated package
11098 -- were exchanged when only the declaration was needed.
11099 -- Restore instantiation node before proceeding with body.
11101 Set_Unit (Parent (True_Parent), Inst_Node);
11104 -- Now complete instantiation of enclosing body, if it appears in
11105 -- some other unit. If it appears in the current unit, the body
11106 -- will have been instantiated already.
11108 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
11110 -- We need to determine the expander mode to instantiate the
11111 -- enclosing body. Because the generic body we need may use
11112 -- global entities declared in the enclosing package (including
11113 -- aggregates) it is in general necessary to compile this body
11114 -- with expansion enabled, except if we are within a generic
11115 -- package, in which case the usual generic rule applies.
11118 Exp_Status : Boolean := True;
11122 -- Loop through scopes looking for generic package
11124 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
11125 while Present (Scop)
11126 and then Scop /= Standard_Standard
11128 if Ekind (Scop) = E_Generic_Package then
11129 Exp_Status := False;
11133 Scop := Scope (Scop);
11136 -- Collect previous instantiations in the unit that contains
11137 -- the desired generic.
11139 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
11140 and then not Body_Optional
11144 Info : Pending_Body_Info;
11148 Par := Parent (Inst_Node);
11149 while Present (Par) loop
11150 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
11151 Par := Parent (Par);
11154 pragma Assert (Present (Par));
11156 if Nkind (Par) = N_Package_Body then
11157 Collect_Previous_Instances (Declarations (Par));
11159 elsif Nkind (Par) = N_Package_Declaration then
11160 Collect_Previous_Instances
11161 (Visible_Declarations (Specification (Par)));
11162 Collect_Previous_Instances
11163 (Private_Declarations (Specification (Par)));
11166 -- Enclosing unit is a subprogram body. In this
11167 -- case all instance bodies are processed in order
11168 -- and there is no need to collect them separately.
11173 Decl := First_Elmt (Previous_Instances);
11174 while Present (Decl) loop
11176 (Inst_Node => Node (Decl),
11178 Instance_Spec (Node (Decl)),
11179 Expander_Status => Exp_Status,
11180 Current_Sem_Unit =>
11181 Get_Code_Unit (Sloc (Node (Decl))),
11182 Scope_Suppress => Scope_Suppress,
11183 Local_Suppress_Stack_Top =>
11184 Local_Suppress_Stack_Top,
11185 Version => Ada_Version);
11187 -- Package instance
11190 Nkind (Node (Decl)) = N_Package_Instantiation
11192 Instantiate_Package_Body
11193 (Info, Body_Optional => True);
11195 -- Subprogram instance
11198 -- The instance_spec is the wrapper package,
11199 -- and the subprogram declaration is the last
11200 -- declaration in the wrapper.
11204 (Visible_Declarations
11205 (Specification (Info.Act_Decl)));
11207 Instantiate_Subprogram_Body
11208 (Info, Body_Optional => True);
11216 Instantiate_Package_Body
11218 ((Inst_Node => Inst_Node,
11219 Act_Decl => True_Parent,
11220 Expander_Status => Exp_Status,
11221 Current_Sem_Unit =>
11222 Get_Code_Unit (Sloc (Inst_Node)),
11223 Scope_Suppress => Scope_Suppress,
11224 Local_Suppress_Stack_Top =>
11225 Local_Suppress_Stack_Top,
11226 Version => Ada_Version)),
11227 Body_Optional => Body_Optional);
11231 -- Case where we are not instantiating a nested generic
11234 Opt.Style_Check := False;
11235 Expander_Mode_Save_And_Set (True);
11236 Load_Needed_Body (Comp_Unit, OK);
11237 Opt.Style_Check := Save_Style_Check;
11238 Expander_Mode_Restore;
11241 and then Unit_Requires_Body (Defining_Entity (Spec))
11242 and then not Body_Optional
11245 Bname : constant Unit_Name_Type :=
11246 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
11249 -- In CodePeer mode, the missing body may make the analysis
11250 -- incomplete, but we do not treat it as fatal.
11252 if CodePeer_Mode then
11256 Error_Msg_Unit_1 := Bname;
11257 Error_Msg_N ("this instantiation requires$!", N);
11258 Error_Msg_File_1 :=
11259 Get_File_Name (Bname, Subunit => False);
11260 Error_Msg_N ("\but file{ was not found!", N);
11261 raise Unrecoverable_Error;
11268 -- If loading parent of the generic caused an instantiation circularity,
11269 -- we abandon compilation at this point, because otherwise in some cases
11270 -- we get into trouble with infinite recursions after this point.
11272 if Circularity_Detected then
11273 raise Unrecoverable_Error;
11275 end Load_Parent_Of_Generic;
11277 ---------------------------------
11278 -- Map_Formal_Package_Entities --
11279 ---------------------------------
11281 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
11286 Set_Instance_Of (Form, Act);
11288 -- Traverse formal and actual package to map the corresponding entities.
11289 -- We skip over internal entities that may be generated during semantic
11290 -- analysis, and find the matching entities by name, given that they
11291 -- must appear in the same order.
11293 E1 := First_Entity (Form);
11294 E2 := First_Entity (Act);
11295 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
11296 -- Could this test be a single condition???
11297 -- Seems like it could, and isn't FPE (Form) a constant anyway???
11299 if not Is_Internal (E1)
11300 and then Present (Parent (E1))
11301 and then not Is_Class_Wide_Type (E1)
11302 and then not Is_Internal_Name (Chars (E1))
11304 while Present (E2) and then Chars (E2) /= Chars (E1) loop
11311 Set_Instance_Of (E1, E2);
11313 if Is_Type (E1) and then Is_Tagged_Type (E2) then
11314 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
11317 if Is_Constrained (E1) then
11318 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
11321 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
11322 Map_Formal_Package_Entities (E1, E2);
11329 end Map_Formal_Package_Entities;
11331 -----------------------
11332 -- Move_Freeze_Nodes --
11333 -----------------------
11335 procedure Move_Freeze_Nodes
11336 (Out_Of : Entity_Id;
11341 Next_Decl : Node_Id;
11342 Next_Node : Node_Id := After;
11345 function Is_Outer_Type (T : Entity_Id) return Boolean;
11346 -- Check whether entity is declared in a scope external to that of the
11349 -------------------
11350 -- Is_Outer_Type --
11351 -------------------
11353 function Is_Outer_Type (T : Entity_Id) return Boolean is
11354 Scop : Entity_Id := Scope (T);
11357 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
11361 while Scop /= Standard_Standard loop
11362 if Scop = Out_Of then
11365 Scop := Scope (Scop);
11373 -- Start of processing for Move_Freeze_Nodes
11380 -- First remove the freeze nodes that may appear before all other
11384 while Present (Decl)
11385 and then Nkind (Decl) = N_Freeze_Entity
11386 and then Is_Outer_Type (Entity (Decl))
11388 Decl := Remove_Head (L);
11389 Insert_After (Next_Node, Decl);
11390 Set_Analyzed (Decl, False);
11395 -- Next scan the list of declarations and remove each freeze node that
11396 -- appears ahead of the current node.
11398 while Present (Decl) loop
11399 while Present (Next (Decl))
11400 and then Nkind (Next (Decl)) = N_Freeze_Entity
11401 and then Is_Outer_Type (Entity (Next (Decl)))
11403 Next_Decl := Remove_Next (Decl);
11404 Insert_After (Next_Node, Next_Decl);
11405 Set_Analyzed (Next_Decl, False);
11406 Next_Node := Next_Decl;
11409 -- If the declaration is a nested package or concurrent type, then
11410 -- recurse. Nested generic packages will have been processed from the
11413 case Nkind (Decl) is
11414 when N_Package_Declaration =>
11415 Spec := Specification (Decl);
11417 when N_Task_Type_Declaration =>
11418 Spec := Task_Definition (Decl);
11420 when N_Protected_Type_Declaration =>
11421 Spec := Protected_Definition (Decl);
11427 if Present (Spec) then
11428 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
11429 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
11434 end Move_Freeze_Nodes;
11440 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
11442 return Generic_Renamings.Table (E).Next_In_HTable;
11445 ------------------------
11446 -- Preanalyze_Actuals --
11447 ------------------------
11449 procedure Preanalyze_Actuals (N : Node_Id) is
11452 Errs : constant Int := Serious_Errors_Detected;
11454 Cur : Entity_Id := Empty;
11455 -- Current homograph of the instance name
11458 -- Saved visibility status of the current homograph
11461 Assoc := First (Generic_Associations (N));
11463 -- If the instance is a child unit, its name may hide an outer homonym,
11464 -- so make it invisible to perform name resolution on the actuals.
11466 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
11468 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
11470 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
11472 if Is_Compilation_Unit (Cur) then
11473 Vis := Is_Immediately_Visible (Cur);
11474 Set_Is_Immediately_Visible (Cur, False);
11480 while Present (Assoc) loop
11481 if Nkind (Assoc) /= N_Others_Choice then
11482 Act := Explicit_Generic_Actual_Parameter (Assoc);
11484 -- Within a nested instantiation, a defaulted actual is an empty
11485 -- association, so nothing to analyze. If the subprogram actual
11486 -- is an attribute, analyze prefix only, because actual is not a
11487 -- complete attribute reference.
11489 -- If actual is an allocator, analyze expression only. The full
11490 -- analysis can generate code, and if instance is a compilation
11491 -- unit we have to wait until the package instance is installed
11492 -- to have a proper place to insert this code.
11494 -- String literals may be operators, but at this point we do not
11495 -- know whether the actual is a formal subprogram or a string.
11500 elsif Nkind (Act) = N_Attribute_Reference then
11501 Analyze (Prefix (Act));
11503 elsif Nkind (Act) = N_Explicit_Dereference then
11504 Analyze (Prefix (Act));
11506 elsif Nkind (Act) = N_Allocator then
11508 Expr : constant Node_Id := Expression (Act);
11511 if Nkind (Expr) = N_Subtype_Indication then
11512 Analyze (Subtype_Mark (Expr));
11514 -- Analyze separately each discriminant constraint, when
11515 -- given with a named association.
11521 Constr := First (Constraints (Constraint (Expr)));
11522 while Present (Constr) loop
11523 if Nkind (Constr) = N_Discriminant_Association then
11524 Analyze (Expression (Constr));
11538 elsif Nkind (Act) /= N_Operator_Symbol then
11542 if Errs /= Serious_Errors_Detected then
11544 -- Do a minimal analysis of the generic, to prevent spurious
11545 -- warnings complaining about the generic being unreferenced,
11546 -- before abandoning the instantiation.
11548 Analyze (Name (N));
11550 if Is_Entity_Name (Name (N))
11551 and then Etype (Name (N)) /= Any_Type
11553 Generate_Reference (Entity (Name (N)), Name (N));
11554 Set_Is_Instantiated (Entity (Name (N)));
11557 if Present (Cur) then
11559 -- For the case of a child instance hiding an outer homonym,
11560 -- provide additional warning which might explain the error.
11562 Set_Is_Immediately_Visible (Cur, Vis);
11563 Error_Msg_NE ("& hides outer unit with the same name?",
11564 N, Defining_Unit_Name (N));
11567 Abandon_Instantiation (Act);
11574 if Present (Cur) then
11575 Set_Is_Immediately_Visible (Cur, Vis);
11577 end Preanalyze_Actuals;
11579 -------------------
11580 -- Remove_Parent --
11581 -------------------
11583 procedure Remove_Parent (In_Body : Boolean := False) is
11584 S : Entity_Id := Current_Scope;
11585 -- S is the scope containing the instantiation just completed. The scope
11586 -- stack contains the parent instances of the instantiation, followed by
11595 -- After child instantiation is complete, remove from scope stack the
11596 -- extra copy of the current scope, and then remove parent instances.
11598 if not In_Body then
11601 while Current_Scope /= S loop
11602 P := Current_Scope;
11603 End_Package_Scope (Current_Scope);
11605 if In_Open_Scopes (P) then
11606 E := First_Entity (P);
11607 while Present (E) loop
11608 Set_Is_Immediately_Visible (E, True);
11612 -- If instantiation is declared in a block, it is the enclosing
11613 -- scope that might be a parent instance. Note that only one
11614 -- block can be involved, because the parent instances have
11615 -- been installed within it.
11617 if Ekind (P) = E_Block then
11618 Cur_P := Scope (P);
11623 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
11624 -- We are within an instance of some sibling. Retain
11625 -- visibility of parent, for proper subsequent cleanup, and
11626 -- reinstall private declarations as well.
11628 Set_In_Private_Part (P);
11629 Install_Private_Declarations (P);
11632 -- If the ultimate parent is a top-level unit recorded in
11633 -- Instance_Parent_Unit, then reset its visibility to what it was
11634 -- before instantiation. (It's not clear what the purpose is of
11635 -- testing whether Scope (P) is In_Open_Scopes, but that test was
11636 -- present before the ultimate parent test was added.???)
11638 elsif not In_Open_Scopes (Scope (P))
11639 or else (P = Instance_Parent_Unit
11640 and then not Parent_Unit_Visible)
11642 Set_Is_Immediately_Visible (P, False);
11644 -- If the current scope is itself an instantiation of a generic
11645 -- nested within P, and we are in the private part of body of this
11646 -- instantiation, restore the full views of P, that were removed
11647 -- in End_Package_Scope above. This obscure case can occur when a
11648 -- subunit of a generic contains an instance of a child unit of
11649 -- its generic parent unit.
11651 elsif S = Current_Scope and then Is_Generic_Instance (S) then
11653 Par : constant Entity_Id :=
11655 (Specification (Unit_Declaration_Node (S)));
11658 and then P = Scope (Par)
11659 and then (In_Package_Body (S) or else In_Private_Part (S))
11661 Set_In_Private_Part (P);
11662 Install_Private_Declarations (P);
11668 -- Reset visibility of entities in the enclosing scope
11670 Set_Is_Hidden_Open_Scope (Current_Scope, False);
11672 Hidden := First_Elmt (Hidden_Entities);
11673 while Present (Hidden) loop
11674 Set_Is_Immediately_Visible (Node (Hidden), True);
11675 Next_Elmt (Hidden);
11679 -- Each body is analyzed separately, and there is no context that
11680 -- needs preserving from one body instance to the next, so remove all
11681 -- parent scopes that have been installed.
11683 while Present (S) loop
11684 End_Package_Scope (S);
11685 Set_Is_Immediately_Visible (S, False);
11686 S := Current_Scope;
11687 exit when S = Standard_Standard;
11696 procedure Restore_Env is
11697 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
11700 if No (Current_Instantiated_Parent.Act_Id) then
11701 -- Restore environment after subprogram inlining
11703 Restore_Private_Views (Empty);
11706 Current_Instantiated_Parent := Saved.Instantiated_Parent;
11707 Exchanged_Views := Saved.Exchanged_Views;
11708 Hidden_Entities := Saved.Hidden_Entities;
11709 Current_Sem_Unit := Saved.Current_Sem_Unit;
11710 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
11711 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
11713 Restore_Opt_Config_Switches (Saved.Switches);
11715 Instance_Envs.Decrement_Last;
11718 ---------------------------
11719 -- Restore_Private_Views --
11720 ---------------------------
11722 procedure Restore_Private_Views
11723 (Pack_Id : Entity_Id;
11724 Is_Package : Boolean := True)
11729 Dep_Elmt : Elmt_Id;
11732 procedure Restore_Nested_Formal (Formal : Entity_Id);
11733 -- Hide the generic formals of formal packages declared with box which
11734 -- were reachable in the current instantiation.
11736 ---------------------------
11737 -- Restore_Nested_Formal --
11738 ---------------------------
11740 procedure Restore_Nested_Formal (Formal : Entity_Id) is
11744 if Present (Renamed_Object (Formal))
11745 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
11749 elsif Present (Associated_Formal_Package (Formal)) then
11750 Ent := First_Entity (Formal);
11751 while Present (Ent) loop
11752 exit when Ekind (Ent) = E_Package
11753 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
11755 Set_Is_Hidden (Ent);
11756 Set_Is_Potentially_Use_Visible (Ent, False);
11758 -- If package, then recurse
11760 if Ekind (Ent) = E_Package then
11761 Restore_Nested_Formal (Ent);
11767 end Restore_Nested_Formal;
11769 -- Start of processing for Restore_Private_Views
11772 M := First_Elmt (Exchanged_Views);
11773 while Present (M) loop
11776 -- Subtypes of types whose views have been exchanged, and that are
11777 -- defined within the instance, were not on the Private_Dependents
11778 -- list on entry to the instance, so they have to be exchanged
11779 -- explicitly now, in order to remain consistent with the view of the
11782 if Ekind_In (Typ, E_Private_Type,
11783 E_Limited_Private_Type,
11784 E_Record_Type_With_Private)
11786 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
11787 while Present (Dep_Elmt) loop
11788 Dep_Typ := Node (Dep_Elmt);
11790 if Scope (Dep_Typ) = Pack_Id
11791 and then Present (Full_View (Dep_Typ))
11793 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
11794 Exchange_Declarations (Dep_Typ);
11797 Next_Elmt (Dep_Elmt);
11801 Exchange_Declarations (Node (M));
11805 if No (Pack_Id) then
11809 -- Make the generic formal parameters private, and make the formal types
11810 -- into subtypes of the actuals again.
11812 E := First_Entity (Pack_Id);
11813 while Present (E) loop
11814 Set_Is_Hidden (E, True);
11817 and then Nkind (Parent (E)) = N_Subtype_Declaration
11819 Set_Is_Generic_Actual_Type (E, False);
11821 -- An unusual case of aliasing: the actual may also be directly
11822 -- visible in the generic, and be private there, while it is fully
11823 -- visible in the context of the instance. The internal subtype
11824 -- is private in the instance but has full visibility like its
11825 -- parent in the enclosing scope. This enforces the invariant that
11826 -- the privacy status of all private dependents of a type coincide
11827 -- with that of the parent type. This can only happen when a
11828 -- generic child unit is instantiated within a sibling.
11830 if Is_Private_Type (E)
11831 and then not Is_Private_Type (Etype (E))
11833 Exchange_Declarations (E);
11836 elsif Ekind (E) = E_Package then
11838 -- The end of the renaming list is the renaming of the generic
11839 -- package itself. If the instance is a subprogram, all entities
11840 -- in the corresponding package are renamings. If this entity is
11841 -- a formal package, make its own formals private as well. The
11842 -- actual in this case is itself the renaming of an instantiation.
11843 -- If the entity is not a package renaming, it is the entity
11844 -- created to validate formal package actuals: ignore it.
11846 -- If the actual is itself a formal package for the enclosing
11847 -- generic, or the actual for such a formal package, it remains
11848 -- visible on exit from the instance, and therefore nothing needs
11849 -- to be done either, except to keep it accessible.
11851 if Is_Package and then Renamed_Object (E) = Pack_Id then
11854 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
11858 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
11860 Set_Is_Hidden (E, False);
11864 Act_P : constant Entity_Id := Renamed_Object (E);
11868 Id := First_Entity (Act_P);
11870 and then Id /= First_Private_Entity (Act_P)
11872 exit when Ekind (Id) = E_Package
11873 and then Renamed_Object (Id) = Act_P;
11875 Set_Is_Hidden (Id, True);
11876 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
11878 if Ekind (Id) = E_Package then
11879 Restore_Nested_Formal (Id);
11890 end Restore_Private_Views;
11897 (Gen_Unit : Entity_Id;
11898 Act_Unit : Entity_Id)
11902 Set_Instance_Env (Gen_Unit, Act_Unit);
11905 ----------------------------
11906 -- Save_Global_References --
11907 ----------------------------
11909 procedure Save_Global_References (N : Node_Id) is
11910 Gen_Scope : Entity_Id;
11914 function Is_Global (E : Entity_Id) return Boolean;
11915 -- Check whether entity is defined outside of generic unit. Examine the
11916 -- scope of an entity, and the scope of the scope, etc, until we find
11917 -- either Standard, in which case the entity is global, or the generic
11918 -- unit itself, which indicates that the entity is local. If the entity
11919 -- is the generic unit itself, as in the case of a recursive call, or
11920 -- the enclosing generic unit, if different from the current scope, then
11921 -- it is local as well, because it will be replaced at the point of
11922 -- instantiation. On the other hand, if it is a reference to a child
11923 -- unit of a common ancestor, which appears in an instantiation, it is
11924 -- global because it is used to denote a specific compilation unit at
11925 -- the time the instantiations will be analyzed.
11927 procedure Reset_Entity (N : Node_Id);
11928 -- Save semantic information on global entity so that it is not resolved
11929 -- again at instantiation time.
11931 procedure Save_Entity_Descendants (N : Node_Id);
11932 -- Apply Save_Global_References to the two syntactic descendants of
11933 -- non-terminal nodes that carry an Associated_Node and are processed
11934 -- through Reset_Entity. Once the global entity (if any) has been
11935 -- captured together with its type, only two syntactic descendants need
11936 -- to be traversed to complete the processing of the tree rooted at N.
11937 -- This applies to Selected_Components, Expanded_Names, and to Operator
11938 -- nodes. N can also be a character literal, identifier, or operator
11939 -- symbol node, but the call has no effect in these cases.
11941 procedure Save_Global_Defaults (N1, N2 : Node_Id);
11942 -- Default actuals in nested instances must be handled specially
11943 -- because there is no link to them from the original tree. When an
11944 -- actual subprogram is given by a default, we add an explicit generic
11945 -- association for it in the instantiation node. When we save the
11946 -- global references on the name of the instance, we recover the list
11947 -- of generic associations, and add an explicit one to the original
11948 -- generic tree, through which a global actual can be preserved.
11949 -- Similarly, if a child unit is instantiated within a sibling, in the
11950 -- context of the parent, we must preserve the identifier of the parent
11951 -- so that it can be properly resolved in a subsequent instantiation.
11953 procedure Save_Global_Descendant (D : Union_Id);
11954 -- Apply Save_Global_References recursively to the descendents of the
11957 procedure Save_References (N : Node_Id);
11958 -- This is the recursive procedure that does the work, once the
11959 -- enclosing generic scope has been established.
11965 function Is_Global (E : Entity_Id) return Boolean is
11968 function Is_Instance_Node (Decl : Node_Id) return Boolean;
11969 -- Determine whether the parent node of a reference to a child unit
11970 -- denotes an instantiation or a formal package, in which case the
11971 -- reference to the child unit is global, even if it appears within
11972 -- the current scope (e.g. when the instance appears within the body
11973 -- of an ancestor).
11975 ----------------------
11976 -- Is_Instance_Node --
11977 ----------------------
11979 function Is_Instance_Node (Decl : Node_Id) return Boolean is
11981 return Nkind (Decl) in N_Generic_Instantiation
11983 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
11984 end Is_Instance_Node;
11986 -- Start of processing for Is_Global
11989 if E = Gen_Scope then
11992 elsif E = Standard_Standard then
11995 elsif Is_Child_Unit (E)
11996 and then (Is_Instance_Node (Parent (N2))
11997 or else (Nkind (Parent (N2)) = N_Expanded_Name
11998 and then N2 = Selector_Name (Parent (N2))
12000 Is_Instance_Node (Parent (Parent (N2)))))
12006 while Se /= Gen_Scope loop
12007 if Se = Standard_Standard then
12022 procedure Reset_Entity (N : Node_Id) is
12024 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
12025 -- If the type of N2 is global to the generic unit. Save the type in
12026 -- the generic node.
12027 -- What does this comment mean???
12029 function Top_Ancestor (E : Entity_Id) return Entity_Id;
12030 -- Find the ultimate ancestor of the current unit. If it is not a
12031 -- generic unit, then the name of the current unit in the prefix of
12032 -- an expanded name must be replaced with its generic homonym to
12033 -- ensure that it will be properly resolved in an instance.
12035 ---------------------
12036 -- Set_Global_Type --
12037 ---------------------
12039 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
12040 Typ : constant Entity_Id := Etype (N2);
12043 Set_Etype (N, Typ);
12045 if Entity (N) /= N2
12046 and then Has_Private_View (Entity (N))
12048 -- If the entity of N is not the associated node, this is a
12049 -- nested generic and it has an associated node as well, whose
12050 -- type is already the full view (see below). Indicate that the
12051 -- original node has a private view.
12053 Set_Has_Private_View (N);
12056 -- If not a private type, nothing else to do
12058 if not Is_Private_Type (Typ) then
12059 if Is_Array_Type (Typ)
12060 and then Is_Private_Type (Component_Type (Typ))
12062 Set_Has_Private_View (N);
12065 -- If it is a derivation of a private type in a context where no
12066 -- full view is needed, nothing to do either.
12068 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
12071 -- Otherwise mark the type for flipping and use the full view when
12075 Set_Has_Private_View (N);
12077 if Present (Full_View (Typ)) then
12078 Set_Etype (N2, Full_View (Typ));
12081 end Set_Global_Type;
12087 function Top_Ancestor (E : Entity_Id) return Entity_Id is
12092 while Is_Child_Unit (Par) loop
12093 Par := Scope (Par);
12099 -- Start of processing for Reset_Entity
12102 N2 := Get_Associated_Node (N);
12105 if Present (E) then
12107 -- If the node is an entry call to an entry in an enclosing task,
12108 -- it is rewritten as a selected component. No global entity to
12109 -- preserve in this case, since the expansion will be redone in
12112 if not Nkind_In (E, N_Defining_Identifier,
12113 N_Defining_Character_Literal,
12114 N_Defining_Operator_Symbol)
12116 Set_Associated_Node (N, Empty);
12117 Set_Etype (N, Empty);
12121 -- If the entity is an itype created as a subtype of an access
12122 -- type with a null exclusion restore source entity for proper
12123 -- visibility. The itype will be created anew in the instance.
12126 and then Ekind (E) = E_Access_Subtype
12127 and then Is_Entity_Name (N)
12128 and then Chars (Etype (E)) = Chars (N)
12131 Set_Entity (N2, E);
12135 if Is_Global (E) then
12136 Set_Global_Type (N, N2);
12138 elsif Nkind (N) = N_Op_Concat
12139 and then Is_Generic_Type (Etype (N2))
12140 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
12142 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
12143 and then Is_Intrinsic_Subprogram (E)
12148 -- Entity is local. Mark generic node as unresolved.
12149 -- Note that now it does not have an entity.
12151 Set_Associated_Node (N, Empty);
12152 Set_Etype (N, Empty);
12155 if Nkind (Parent (N)) in N_Generic_Instantiation
12156 and then N = Name (Parent (N))
12158 Save_Global_Defaults (Parent (N), Parent (N2));
12161 elsif Nkind (Parent (N)) = N_Selected_Component
12162 and then Nkind (Parent (N2)) = N_Expanded_Name
12164 if Is_Global (Entity (Parent (N2))) then
12165 Change_Selected_Component_To_Expanded_Name (Parent (N));
12166 Set_Associated_Node (Parent (N), Parent (N2));
12167 Set_Global_Type (Parent (N), Parent (N2));
12168 Save_Entity_Descendants (N);
12170 -- If this is a reference to the current generic entity, replace
12171 -- by the name of the generic homonym of the current package. This
12172 -- is because in an instantiation Par.P.Q will not resolve to the
12173 -- name of the instance, whose enclosing scope is not necessarily
12174 -- Par. We use the generic homonym rather that the name of the
12175 -- generic itself because it may be hidden by a local declaration.
12177 elsif In_Open_Scopes (Entity (Parent (N2)))
12179 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
12181 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
12182 Rewrite (Parent (N),
12183 Make_Identifier (Sloc (N),
12185 Chars (Generic_Homonym (Entity (Parent (N2))))));
12187 Rewrite (Parent (N),
12188 Make_Identifier (Sloc (N),
12189 Chars => Chars (Selector_Name (Parent (N2)))));
12193 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
12194 and then Parent (N) = Name (Parent (Parent (N)))
12196 Save_Global_Defaults
12197 (Parent (Parent (N)), Parent (Parent ((N2))));
12200 -- A selected component may denote a static constant that has been
12201 -- folded. If the static constant is global to the generic, capture
12202 -- its value. Otherwise the folding will happen in any instantiation.
12204 elsif Nkind (Parent (N)) = N_Selected_Component
12205 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
12207 if Present (Entity (Original_Node (Parent (N2))))
12208 and then Is_Global (Entity (Original_Node (Parent (N2))))
12210 Rewrite (Parent (N), New_Copy (Parent (N2)));
12211 Set_Analyzed (Parent (N), False);
12217 -- A selected component may be transformed into a parameterless
12218 -- function call. If the called entity is global, rewrite the node
12219 -- appropriately, i.e. as an extended name for the global entity.
12221 elsif Nkind (Parent (N)) = N_Selected_Component
12222 and then Nkind (Parent (N2)) = N_Function_Call
12223 and then N = Selector_Name (Parent (N))
12225 if No (Parameter_Associations (Parent (N2))) then
12226 if Is_Global (Entity (Name (Parent (N2)))) then
12227 Change_Selected_Component_To_Expanded_Name (Parent (N));
12228 Set_Associated_Node (Parent (N), Name (Parent (N2)));
12229 Set_Global_Type (Parent (N), Name (Parent (N2)));
12230 Save_Entity_Descendants (N);
12233 Set_Associated_Node (N, Empty);
12234 Set_Etype (N, Empty);
12237 -- In Ada 2005, X.F may be a call to a primitive operation,
12238 -- rewritten as F (X). This rewriting will be done again in an
12239 -- instance, so keep the original node. Global entities will be
12240 -- captured as for other constructs.
12246 -- Entity is local. Reset in generic unit, so that node is resolved
12247 -- anew at the point of instantiation.
12250 Set_Associated_Node (N, Empty);
12251 Set_Etype (N, Empty);
12255 -----------------------------
12256 -- Save_Entity_Descendants --
12257 -----------------------------
12259 procedure Save_Entity_Descendants (N : Node_Id) is
12262 when N_Binary_Op =>
12263 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
12264 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12267 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
12269 when N_Expanded_Name | N_Selected_Component =>
12270 Save_Global_Descendant (Union_Id (Prefix (N)));
12271 Save_Global_Descendant (Union_Id (Selector_Name (N)));
12273 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
12277 raise Program_Error;
12279 end Save_Entity_Descendants;
12281 --------------------------
12282 -- Save_Global_Defaults --
12283 --------------------------
12285 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
12286 Loc : constant Source_Ptr := Sloc (N1);
12287 Assoc2 : constant List_Id := Generic_Associations (N2);
12288 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
12295 Actual : Entity_Id;
12298 Assoc1 := Generic_Associations (N1);
12300 if Present (Assoc1) then
12301 Act1 := First (Assoc1);
12304 Set_Generic_Associations (N1, New_List);
12305 Assoc1 := Generic_Associations (N1);
12308 if Present (Assoc2) then
12309 Act2 := First (Assoc2);
12314 while Present (Act1) and then Present (Act2) loop
12319 -- Find the associations added for default subprograms
12321 if Present (Act2) then
12322 while Nkind (Act2) /= N_Generic_Association
12323 or else No (Entity (Selector_Name (Act2)))
12324 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
12329 -- Add a similar association if the default is global. The
12330 -- renaming declaration for the actual has been analyzed, and
12331 -- its alias is the program it renames. Link the actual in the
12332 -- original generic tree with the node in the analyzed tree.
12334 while Present (Act2) loop
12335 Subp := Entity (Selector_Name (Act2));
12336 Def := Explicit_Generic_Actual_Parameter (Act2);
12338 -- Following test is defence against rubbish errors
12340 if No (Alias (Subp)) then
12344 -- Retrieve the resolved actual from the renaming declaration
12345 -- created for the instantiated formal.
12347 Actual := Entity (Name (Parent (Parent (Subp))));
12348 Set_Entity (Def, Actual);
12349 Set_Etype (Def, Etype (Actual));
12351 if Is_Global (Actual) then
12353 Make_Generic_Association (Loc,
12354 Selector_Name => New_Occurrence_Of (Subp, Loc),
12355 Explicit_Generic_Actual_Parameter =>
12356 New_Occurrence_Of (Actual, Loc));
12358 Set_Associated_Node
12359 (Explicit_Generic_Actual_Parameter (Ndec), Def);
12361 Append (Ndec, Assoc1);
12363 -- If there are other defaults, add a dummy association in case
12364 -- there are other defaulted formals with the same name.
12366 elsif Present (Next (Act2)) then
12368 Make_Generic_Association (Loc,
12369 Selector_Name => New_Occurrence_Of (Subp, Loc),
12370 Explicit_Generic_Actual_Parameter => Empty);
12372 Append (Ndec, Assoc1);
12379 if Nkind (Name (N1)) = N_Identifier
12380 and then Is_Child_Unit (Gen_Id)
12381 and then Is_Global (Gen_Id)
12382 and then Is_Generic_Unit (Scope (Gen_Id))
12383 and then In_Open_Scopes (Scope (Gen_Id))
12385 -- This is an instantiation of a child unit within a sibling, so
12386 -- that the generic parent is in scope. An eventual instance must
12387 -- occur within the scope of an instance of the parent. Make name
12388 -- in instance into an expanded name, to preserve the identifier
12389 -- of the parent, so it can be resolved subsequently.
12391 Rewrite (Name (N2),
12392 Make_Expanded_Name (Loc,
12393 Chars => Chars (Gen_Id),
12394 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
12395 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
12396 Set_Entity (Name (N2), Gen_Id);
12398 Rewrite (Name (N1),
12399 Make_Expanded_Name (Loc,
12400 Chars => Chars (Gen_Id),
12401 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
12402 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
12404 Set_Associated_Node (Name (N1), Name (N2));
12405 Set_Associated_Node (Prefix (Name (N1)), Empty);
12406 Set_Associated_Node
12407 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
12408 Set_Etype (Name (N1), Etype (Gen_Id));
12411 end Save_Global_Defaults;
12413 ----------------------------
12414 -- Save_Global_Descendant --
12415 ----------------------------
12417 procedure Save_Global_Descendant (D : Union_Id) is
12421 if D in Node_Range then
12422 if D = Union_Id (Empty) then
12425 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
12426 Save_References (Node_Id (D));
12429 elsif D in List_Range then
12430 if D = Union_Id (No_List)
12431 or else Is_Empty_List (List_Id (D))
12436 N1 := First (List_Id (D));
12437 while Present (N1) loop
12438 Save_References (N1);
12443 -- Element list or other non-node field, nothing to do
12448 end Save_Global_Descendant;
12450 ---------------------
12451 -- Save_References --
12452 ---------------------
12454 -- This is the recursive procedure that does the work once the enclosing
12455 -- generic scope has been established. We have to treat specially a
12456 -- number of node rewritings that are required by semantic processing
12457 -- and which change the kind of nodes in the generic copy: typically
12458 -- constant-folding, replacing an operator node by a string literal, or
12459 -- a selected component by an expanded name. In each of those cases, the
12460 -- transformation is propagated to the generic unit.
12462 procedure Save_References (N : Node_Id) is
12463 Loc : constant Source_Ptr := Sloc (N);
12469 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
12470 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12473 elsif Nkind (N) = N_Operator_Symbol
12474 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
12476 Change_Operator_Symbol_To_String_Literal (N);
12479 elsif Nkind (N) in N_Op then
12480 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12481 if Nkind (N) = N_Op_Concat then
12482 Set_Is_Component_Left_Opnd (N,
12483 Is_Component_Left_Opnd (Get_Associated_Node (N)));
12485 Set_Is_Component_Right_Opnd (N,
12486 Is_Component_Right_Opnd (Get_Associated_Node (N)));
12492 -- Node may be transformed into call to a user-defined operator
12494 N2 := Get_Associated_Node (N);
12496 if Nkind (N2) = N_Function_Call then
12497 E := Entity (Name (N2));
12500 and then Is_Global (E)
12502 Set_Etype (N, Etype (N2));
12504 Set_Associated_Node (N, Empty);
12505 Set_Etype (N, Empty);
12508 elsif Nkind_In (N2, N_Integer_Literal,
12512 if Present (Original_Node (N2))
12513 and then Nkind (Original_Node (N2)) = Nkind (N)
12516 -- Operation was constant-folded. Whenever possible,
12517 -- recover semantic information from unfolded node,
12520 Set_Associated_Node (N, Original_Node (N2));
12522 if Nkind (N) = N_Op_Concat then
12523 Set_Is_Component_Left_Opnd (N,
12524 Is_Component_Left_Opnd (Get_Associated_Node (N)));
12525 Set_Is_Component_Right_Opnd (N,
12526 Is_Component_Right_Opnd (Get_Associated_Node (N)));
12532 -- If original node is already modified, propagate
12533 -- constant-folding to template.
12535 Rewrite (N, New_Copy (N2));
12536 Set_Analyzed (N, False);
12539 elsif Nkind (N2) = N_Identifier
12540 and then Ekind (Entity (N2)) = E_Enumeration_Literal
12542 -- Same if call was folded into a literal, but in this case
12543 -- retain the entity to avoid spurious ambiguities if it is
12544 -- overloaded at the point of instantiation or inlining.
12546 Rewrite (N, New_Copy (N2));
12547 Set_Analyzed (N, False);
12551 -- Complete operands check if node has not been constant-folded
12553 if Nkind (N) in N_Op then
12554 Save_Entity_Descendants (N);
12557 elsif Nkind (N) = N_Identifier then
12558 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12560 -- If this is a discriminant reference, always save it. It is
12561 -- used in the instance to find the corresponding discriminant
12562 -- positionally rather than by name.
12564 Set_Original_Discriminant
12565 (N, Original_Discriminant (Get_Associated_Node (N)));
12569 N2 := Get_Associated_Node (N);
12571 if Nkind (N2) = N_Function_Call then
12572 E := Entity (Name (N2));
12574 -- Name resolves to a call to parameterless function. If
12575 -- original entity is global, mark node as resolved.
12578 and then Is_Global (E)
12580 Set_Etype (N, Etype (N2));
12582 Set_Associated_Node (N, Empty);
12583 Set_Etype (N, Empty);
12586 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
12587 and then Is_Entity_Name (Original_Node (N2))
12589 -- Name resolves to named number that is constant-folded,
12590 -- We must preserve the original name for ASIS use, and
12591 -- undo the constant-folding, which will be repeated in
12594 Set_Associated_Node (N, Original_Node (N2));
12597 elsif Nkind (N2) = N_String_Literal then
12599 -- Name resolves to string literal. Perform the same
12600 -- replacement in generic.
12602 Rewrite (N, New_Copy (N2));
12604 elsif Nkind (N2) = N_Explicit_Dereference then
12606 -- An identifier is rewritten as a dereference if it is the
12607 -- prefix in an implicit dereference (call or attribute).
12608 -- The analysis of an instantiation will expand the node
12609 -- again, so we preserve the original tree but link it to
12610 -- the resolved entity in case it is global.
12612 if Is_Entity_Name (Prefix (N2))
12613 and then Present (Entity (Prefix (N2)))
12614 and then Is_Global (Entity (Prefix (N2)))
12616 Set_Associated_Node (N, Prefix (N2));
12618 elsif Nkind (Prefix (N2)) = N_Function_Call
12619 and then Is_Global (Entity (Name (Prefix (N2))))
12622 Make_Explicit_Dereference (Loc,
12623 Prefix => Make_Function_Call (Loc,
12625 New_Occurrence_Of (Entity (Name (Prefix (N2))),
12629 Set_Associated_Node (N, Empty);
12630 Set_Etype (N, Empty);
12633 -- The subtype mark of a nominally unconstrained object is
12634 -- rewritten as a subtype indication using the bounds of the
12635 -- expression. Recover the original subtype mark.
12637 elsif Nkind (N2) = N_Subtype_Indication
12638 and then Is_Entity_Name (Original_Node (N2))
12640 Set_Associated_Node (N, Original_Node (N2));
12648 elsif Nkind (N) in N_Entity then
12653 Qual : Node_Id := Empty;
12654 Typ : Entity_Id := Empty;
12657 use Atree.Unchecked_Access;
12658 -- This code section is part of implementing an untyped tree
12659 -- traversal, so it needs direct access to node fields.
12662 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
12663 N2 := Get_Associated_Node (N);
12670 -- In an instance within a generic, use the name of the
12671 -- actual and not the original generic parameter. If the
12672 -- actual is global in the current generic it must be
12673 -- preserved for its instantiation.
12675 if Nkind (Parent (Typ)) = N_Subtype_Declaration
12677 Present (Generic_Parent_Type (Parent (Typ)))
12679 Typ := Base_Type (Typ);
12680 Set_Etype (N2, Typ);
12686 or else not Is_Global (Typ)
12688 Set_Associated_Node (N, Empty);
12690 -- If the aggregate is an actual in a call, it has been
12691 -- resolved in the current context, to some local type.
12692 -- The enclosing call may have been disambiguated by the
12693 -- aggregate, and this disambiguation might fail at
12694 -- instantiation time because the type to which the
12695 -- aggregate did resolve is not preserved. In order to
12696 -- preserve some of this information, we wrap the
12697 -- aggregate in a qualified expression, using the id of
12698 -- its type. For further disambiguation we qualify the
12699 -- type name with its scope (if visible) because both
12700 -- id's will have corresponding entities in an instance.
12701 -- This resolves most of the problems with missing type
12702 -- information on aggregates in instances.
12704 if Nkind (N2) = Nkind (N)
12706 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
12708 and then Comes_From_Source (Typ)
12710 if Is_Immediately_Visible (Scope (Typ)) then
12711 Nam := Make_Selected_Component (Loc,
12713 Make_Identifier (Loc, Chars (Scope (Typ))),
12715 Make_Identifier (Loc, Chars (Typ)));
12717 Nam := Make_Identifier (Loc, Chars (Typ));
12721 Make_Qualified_Expression (Loc,
12722 Subtype_Mark => Nam,
12723 Expression => Relocate_Node (N));
12727 Save_Global_Descendant (Field1 (N));
12728 Save_Global_Descendant (Field2 (N));
12729 Save_Global_Descendant (Field3 (N));
12730 Save_Global_Descendant (Field5 (N));
12732 if Present (Qual) then
12736 -- All other cases than aggregates
12739 Save_Global_Descendant (Field1 (N));
12740 Save_Global_Descendant (Field2 (N));
12741 Save_Global_Descendant (Field3 (N));
12742 Save_Global_Descendant (Field4 (N));
12743 Save_Global_Descendant (Field5 (N));
12748 -- If a node has aspects, references within their expressions must
12749 -- be saved separately, given that they are not directly in the
12752 if Has_Aspects (N) then
12756 Aspect := First (Aspect_Specifications (N));
12757 while Present (Aspect) loop
12758 Save_Global_References (Expression (Aspect));
12763 end Save_References;
12765 -- Start of processing for Save_Global_References
12768 Gen_Scope := Current_Scope;
12770 -- If the generic unit is a child unit, references to entities in the
12771 -- parent are treated as local, because they will be resolved anew in
12772 -- the context of the instance of the parent.
12774 while Is_Child_Unit (Gen_Scope)
12775 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
12777 Gen_Scope := Scope (Gen_Scope);
12780 Save_References (N);
12781 end Save_Global_References;
12783 --------------------------------------
12784 -- Set_Copied_Sloc_For_Inlined_Body --
12785 --------------------------------------
12787 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
12789 Create_Instantiation_Source (N, E, True, S_Adjustment);
12790 end Set_Copied_Sloc_For_Inlined_Body;
12792 ---------------------
12793 -- Set_Instance_Of --
12794 ---------------------
12796 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
12798 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
12799 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
12800 Generic_Renamings.Increment_Last;
12801 end Set_Instance_Of;
12803 --------------------
12804 -- Set_Next_Assoc --
12805 --------------------
12807 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
12809 Generic_Renamings.Table (E).Next_In_HTable := Next;
12810 end Set_Next_Assoc;
12812 -------------------
12813 -- Start_Generic --
12814 -------------------
12816 procedure Start_Generic is
12818 -- ??? More things could be factored out in this routine.
12819 -- Should probably be done at a later stage.
12821 Generic_Flags.Append (Inside_A_Generic);
12822 Inside_A_Generic := True;
12824 Expander_Mode_Save_And_Set (False);
12827 ----------------------
12828 -- Set_Instance_Env --
12829 ----------------------
12831 procedure Set_Instance_Env
12832 (Gen_Unit : Entity_Id;
12833 Act_Unit : Entity_Id)
12836 -- Regardless of the current mode, predefined units are analyzed in the
12837 -- most current Ada mode, and earlier version Ada checks do not apply
12838 -- to predefined units. Nothing needs to be done for non-internal units.
12839 -- These are always analyzed in the current mode.
12841 if Is_Internal_File_Name
12842 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
12843 Renamings_Included => True)
12845 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
12848 Current_Instantiated_Parent :=
12849 (Gen_Id => Gen_Unit,
12850 Act_Id => Act_Unit,
12851 Next_In_HTable => Assoc_Null);
12852 end Set_Instance_Env;
12858 procedure Switch_View (T : Entity_Id) is
12859 BT : constant Entity_Id := Base_Type (T);
12860 Priv_Elmt : Elmt_Id := No_Elmt;
12861 Priv_Sub : Entity_Id;
12864 -- T may be private but its base type may have been exchanged through
12865 -- some other occurrence, in which case there is nothing to switch
12866 -- besides T itself. Note that a private dependent subtype of a private
12867 -- type might not have been switched even if the base type has been,
12868 -- because of the last branch of Check_Private_View (see comment there).
12870 if not Is_Private_Type (BT) then
12871 Prepend_Elmt (Full_View (T), Exchanged_Views);
12872 Exchange_Declarations (T);
12876 Priv_Elmt := First_Elmt (Private_Dependents (BT));
12878 if Present (Full_View (BT)) then
12879 Prepend_Elmt (Full_View (BT), Exchanged_Views);
12880 Exchange_Declarations (BT);
12883 while Present (Priv_Elmt) loop
12884 Priv_Sub := (Node (Priv_Elmt));
12886 -- We avoid flipping the subtype if the Etype of its full view is
12887 -- private because this would result in a malformed subtype. This
12888 -- occurs when the Etype of the subtype full view is the full view of
12889 -- the base type (and since the base types were just switched, the
12890 -- subtype is pointing to the wrong view). This is currently the case
12891 -- for tagged record types, access types (maybe more?) and needs to
12892 -- be resolved. ???
12894 if Present (Full_View (Priv_Sub))
12895 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
12897 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
12898 Exchange_Declarations (Priv_Sub);
12901 Next_Elmt (Priv_Elmt);
12905 -----------------------------
12906 -- Valid_Default_Attribute --
12907 -----------------------------
12909 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
12910 Attr_Id : constant Attribute_Id :=
12911 Get_Attribute_Id (Attribute_Name (Def));
12912 T : constant Entity_Id := Entity (Prefix (Def));
12913 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
12926 F := First_Formal (Nam);
12927 while Present (F) loop
12928 Num_F := Num_F + 1;
12933 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12934 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12935 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12936 Attribute_Unbiased_Rounding =>
12939 and then Is_Floating_Point_Type (T);
12941 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12942 Attribute_Value | Attribute_Wide_Image |
12943 Attribute_Wide_Value =>
12944 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
12946 when Attribute_Max | Attribute_Min =>
12947 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
12949 when Attribute_Input =>
12950 OK := (Is_Fun and then Num_F = 1);
12952 when Attribute_Output | Attribute_Read | Attribute_Write =>
12953 OK := (not Is_Fun and then Num_F = 2);
12960 Error_Msg_N ("attribute reference has wrong profile for subprogram",
12963 end Valid_Default_Attribute;