1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Einfo; use Einfo;
28 with Elists; use Elists;
29 with Errout; use Errout;
30 with Expander; use Expander;
31 with Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Freeze; use Freeze;
35 with Itypes; use Itypes;
37 with Lib.Load; use Lib.Load;
38 with Lib.Xref; use Lib.Xref;
39 with Nlists; use Nlists;
40 with Namet; use Namet;
41 with Nmake; use Nmake;
43 with Rident; use Rident;
44 with Restrict; use Restrict;
45 with Rtsfind; use Rtsfind;
47 with Sem_Aux; use Sem_Aux;
48 with Sem_Cat; use Sem_Cat;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Ch10; use Sem_Ch10;
54 with Sem_Ch13; use Sem_Ch13;
55 with Sem_Disp; use Sem_Disp;
56 with Sem_Elab; use Sem_Elab;
57 with Sem_Elim; use Sem_Elim;
58 with Sem_Eval; use Sem_Eval;
59 with Sem_Res; use Sem_Res;
60 with Sem_Type; use Sem_Type;
61 with Sem_Util; use Sem_Util;
62 with Sem_Warn; use Sem_Warn;
63 with Stand; use Stand;
64 with Sinfo; use Sinfo;
65 with Sinfo.CN; use Sinfo.CN;
66 with Sinput; use Sinput;
67 with Sinput.L; use Sinput.L;
68 with Snames; use Snames;
69 with Stringt; use Stringt;
70 with Uname; use Uname;
72 with Tbuild; use Tbuild;
73 with Uintp; use Uintp;
74 with Urealp; use Urealp;
78 package body Sem_Ch12 is
80 ----------------------------------------------------------
81 -- Implementation of Generic Analysis and Instantiation --
82 ----------------------------------------------------------
84 -- GNAT implements generics by macro expansion. No attempt is made to share
85 -- generic instantiations (for now). Analysis of a generic definition does
86 -- not perform any expansion action, but the expander must be called on the
87 -- tree for each instantiation, because the expansion may of course depend
88 -- on the generic actuals. All of this is best achieved as follows:
90 -- a) Semantic analysis of a generic unit is performed on a copy of the
91 -- tree for the generic unit. All tree modifications that follow analysis
92 -- do not affect the original tree. Links are kept between the original
93 -- tree and the copy, in order to recognize non-local references within
94 -- the generic, and propagate them to each instance (recall that name
95 -- resolution is done on the generic declaration: generics are not really
96 -- macros!). This is summarized in the following diagram:
98 -- .-----------. .----------.
99 -- | semantic |<--------------| generic |
101 -- | |==============>| |
102 -- |___________| global |__________|
113 -- b) Each instantiation copies the original tree, and inserts into it a
114 -- series of declarations that describe the mapping between generic formals
115 -- and actuals. For example, a generic In OUT parameter is an object
116 -- renaming of the corresponding actual, etc. Generic IN parameters are
117 -- constant declarations.
119 -- c) In order to give the right visibility for these renamings, we use
120 -- a different scheme for package and subprogram instantiations. For
121 -- packages, the list of renamings is inserted into the package
122 -- specification, before the visible declarations of the package. The
123 -- renamings are analyzed before any of the text of the instance, and are
124 -- thus visible at the right place. Furthermore, outside of the instance,
125 -- the generic parameters are visible and denote their corresponding
128 -- For subprograms, we create a container package to hold the renamings
129 -- and the subprogram instance itself. Analysis of the package makes the
130 -- renaming declarations visible to the subprogram. After analyzing the
131 -- package, the defining entity for the subprogram is touched-up so that
132 -- it appears declared in the current scope, and not inside the container
135 -- If the instantiation is a compilation unit, the container package is
136 -- given the same name as the subprogram instance. This ensures that
137 -- the elaboration procedure called by the binder, using the compilation
138 -- unit name, calls in fact the elaboration procedure for the package.
140 -- Not surprisingly, private types complicate this approach. By saving in
141 -- the original generic object the non-local references, we guarantee that
142 -- the proper entities are referenced at the point of instantiation.
143 -- However, for private types, this by itself does not insure that the
144 -- proper VIEW of the entity is used (the full type may be visible at the
145 -- point of generic definition, but not at instantiation, or vice-versa).
146 -- In order to reference the proper view, we special-case any reference
147 -- to private types in the generic object, by saving both views, one in
148 -- the generic and one in the semantic copy. At time of instantiation, we
149 -- check whether the two views are consistent, and exchange declarations if
150 -- necessary, in order to restore the correct visibility. Similarly, if
151 -- the instance view is private when the generic view was not, we perform
152 -- the exchange. After completing the instantiation, we restore the
153 -- current visibility. The flag Has_Private_View marks identifiers in the
154 -- the generic unit that require checking.
156 -- Visibility within nested generic units requires special handling.
157 -- Consider the following scheme:
159 -- type Global is ... -- outside of generic unit.
163 -- type Semi_Global is ... -- global to inner.
166 -- procedure inner (X1 : Global; X2 : Semi_Global);
168 -- procedure in2 is new inner (...); -- 4
171 -- package New_Outer is new Outer (...); -- 2
172 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
174 -- The semantic analysis of Outer captures all occurrences of Global.
175 -- The semantic analysis of Inner (at 1) captures both occurrences of
176 -- Global and Semi_Global.
178 -- At point 2 (instantiation of Outer), we also produce a generic copy
179 -- of Inner, even though Inner is, at that point, not being instantiated.
180 -- (This is just part of the semantic analysis of New_Outer).
182 -- Critically, references to Global within Inner must be preserved, while
183 -- references to Semi_Global should not preserved, because they must now
184 -- resolve to an entity within New_Outer. To distinguish between these, we
185 -- use a global variable, Current_Instantiated_Parent, which is set when
186 -- performing a generic copy during instantiation (at 2). This variable is
187 -- used when performing a generic copy that is not an instantiation, but
188 -- that is nested within one, as the occurrence of 1 within 2. The analysis
189 -- of a nested generic only preserves references that are global to the
190 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
191 -- determine whether a reference is external to the given parent.
193 -- The instantiation at point 3 requires no special treatment. The method
194 -- works as well for further nestings of generic units, but of course the
195 -- variable Current_Instantiated_Parent must be stacked because nested
196 -- instantiations can occur, e.g. the occurrence of 4 within 2.
198 -- The instantiation of package and subprogram bodies is handled in a
199 -- similar manner, except that it is delayed until after semantic
200 -- analysis is complete. In this fashion complex cross-dependencies
201 -- between several package declarations and bodies containing generics
202 -- can be compiled which otherwise would diagnose spurious circularities.
204 -- For example, it is possible to compile two packages A and B that
205 -- have the following structure:
207 -- package A is package B is
208 -- generic ... generic ...
209 -- package G_A is package G_B is
212 -- package body A is package body B is
213 -- package N_B is new G_B (..) package N_A is new G_A (..)
215 -- The table Pending_Instantiations in package Inline is used to keep
216 -- track of body instantiations that are delayed in this manner. Inline
217 -- handles the actual calls to do the body instantiations. This activity
218 -- is part of Inline, since the processing occurs at the same point, and
219 -- for essentially the same reason, as the handling of inlined routines.
221 ----------------------------------------------
222 -- Detection of Instantiation Circularities --
223 ----------------------------------------------
225 -- If we have a chain of instantiations that is circular, this is static
226 -- error which must be detected at compile time. The detection of these
227 -- circularities is carried out at the point that we insert a generic
228 -- instance spec or body. If there is a circularity, then the analysis of
229 -- the offending spec or body will eventually result in trying to load the
230 -- same unit again, and we detect this problem as we analyze the package
231 -- instantiation for the second time.
233 -- At least in some cases after we have detected the circularity, we get
234 -- into trouble if we try to keep going. The following flag is set if a
235 -- circularity is detected, and used to abandon compilation after the
236 -- messages have been posted.
238 Circularity_Detected : Boolean := False;
239 -- This should really be reset on encountering a new main unit, but in
240 -- practice we are not using multiple main units so it is not critical.
242 -------------------------------------------------
243 -- Formal packages and partial parametrization --
244 -------------------------------------------------
246 -- When compiling a generic, a formal package is a local instantiation. If
247 -- declared with a box, its generic formals are visible in the enclosing
248 -- generic. If declared with a partial list of actuals, those actuals that
249 -- are defaulted (covered by an Others clause, or given an explicit box
250 -- initialization) are also visible in the enclosing generic, while those
251 -- that have a corresponding actual are not.
253 -- In our source model of instantiation, the same visibility must be
254 -- present in the spec and body of an instance: the names of the formals
255 -- that are defaulted must be made visible within the instance, and made
256 -- invisible (hidden) after the instantiation is complete, so that they
257 -- are not accessible outside of the instance.
259 -- In a generic, a formal package is treated like a special instantiation.
260 -- Our Ada95 compiler handled formals with and without box in different
261 -- ways. With partial parametrization, we use a single model for both.
262 -- We create a package declaration that consists of the specification of
263 -- the generic package, and a set of declarations that map the actuals
264 -- into local renamings, just as we do for bona fide instantiations. For
265 -- defaulted parameters and formals with a box, we copy directly the
266 -- declarations of the formal into this local package. The result is a
267 -- a package whose visible declarations may include generic formals. This
268 -- package is only used for type checking and visibility analysis, and
269 -- never reaches the back-end, so it can freely violate the placement
270 -- rules for generic formal declarations.
272 -- The list of declarations (renamings and copies of formals) is built
273 -- by Analyze_Associations, just as for regular instantiations.
275 -- At the point of instantiation, conformance checking must be applied only
276 -- to those parameters that were specified in the formal. We perform this
277 -- checking by creating another internal instantiation, this one including
278 -- only the renamings and the formals (the rest of the package spec is not
279 -- relevant to conformance checking). We can then traverse two lists: the
280 -- list of actuals in the instance that corresponds to the formal package,
281 -- and the list of actuals produced for this bogus instantiation. We apply
282 -- the conformance rules to those actuals that are not defaulted (i.e.
283 -- which still appear as generic formals.
285 -- When we compile an instance body we must make the right parameters
286 -- visible again. The predicate Is_Generic_Formal indicates which of the
287 -- formals should have its Is_Hidden flag reset.
289 -----------------------
290 -- Local subprograms --
291 -----------------------
293 procedure Abandon_Instantiation (N : Node_Id);
294 pragma No_Return (Abandon_Instantiation);
295 -- Posts an error message "instantiation abandoned" at the indicated node
296 -- and then raises the exception Instantiation_Error to do it.
298 procedure Analyze_Formal_Array_Type
299 (T : in out Entity_Id;
301 -- A formal array type is treated like an array type declaration, and
302 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
303 -- in-out, because in the case of an anonymous type the entity is
304 -- actually created in the procedure.
306 -- The following procedures treat other kinds of formal parameters
308 procedure Analyze_Formal_Derived_Interface_Type
313 procedure Analyze_Formal_Derived_Type
318 procedure Analyze_Formal_Interface_Type
323 -- The following subprograms create abbreviated declarations for formal
324 -- scalar types. We introduce an anonymous base of the proper class for
325 -- each of them, and define the formals as constrained first subtypes of
326 -- their bases. The bounds are expressions that are non-static in the
329 procedure Analyze_Formal_Decimal_Fixed_Point_Type
330 (T : Entity_Id; Def : Node_Id);
331 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
332 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
333 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
334 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
335 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
336 (T : Entity_Id; Def : Node_Id);
338 procedure Analyze_Formal_Private_Type
342 -- Creates a new private type, which does not require completion
344 procedure Analyze_Generic_Formal_Part (N : Node_Id);
346 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
347 -- Create a new access type with the given designated type
349 function Analyze_Associations
352 F_Copy : List_Id) return List_Id;
353 -- At instantiation time, build the list of associations between formals
354 -- and actuals. Each association becomes a renaming declaration for the
355 -- formal entity. F_Copy is the analyzed list of formals in the generic
356 -- copy. It is used to apply legality checks to the actuals. I_Node is the
357 -- instantiation node itself.
359 procedure Analyze_Subprogram_Instantiation
363 procedure Build_Instance_Compilation_Unit_Nodes
367 -- This procedure is used in the case where the generic instance of a
368 -- subprogram body or package body is a library unit. In this case, the
369 -- original library unit node for the generic instantiation must be
370 -- replaced by the resulting generic body, and a link made to a new
371 -- compilation unit node for the generic declaration. The argument N is
372 -- the original generic instantiation. Act_Body and Act_Decl are the body
373 -- and declaration of the instance (either package body and declaration
374 -- nodes or subprogram body and declaration nodes depending on the case).
375 -- On return, the node N has been rewritten with the actual body.
377 procedure Check_Access_Definition (N : Node_Id);
378 -- Subsidiary routine to null exclusion processing. Perform an assertion
379 -- check on Ada version and the presence of an access definition in N.
381 procedure Check_Formal_Packages (P_Id : Entity_Id);
382 -- Apply the following to all formal packages in generic associations
384 procedure Check_Formal_Package_Instance
385 (Formal_Pack : Entity_Id;
386 Actual_Pack : Entity_Id);
387 -- Verify that the actuals of the actual instance match the actuals of
388 -- the template for a formal package that is not declared with a box.
390 procedure Check_Forward_Instantiation (Decl : Node_Id);
391 -- If the generic is a local entity and the corresponding body has not
392 -- been seen yet, flag enclosing packages to indicate that it will be
393 -- elaborated after the generic body. Subprograms declared in the same
394 -- package cannot be inlined by the front-end because front-end inlining
395 -- requires a strict linear order of elaboration.
397 procedure Check_Hidden_Child_Unit
399 Gen_Unit : Entity_Id;
400 Act_Decl_Id : Entity_Id);
401 -- If the generic unit is an implicit child instance within a parent
402 -- instance, we need to make an explicit test that it is not hidden by
403 -- a child instance of the same name and parent.
405 procedure Check_Generic_Actuals
406 (Instance : Entity_Id;
407 Is_Formal_Box : Boolean);
408 -- Similar to previous one. Check the actuals in the instantiation,
409 -- whose views can change between the point of instantiation and the point
410 -- of instantiation of the body. In addition, mark the generic renamings
411 -- as generic actuals, so that they are not compatible with other actuals.
412 -- Recurse on an actual that is a formal package whose declaration has
415 function Contains_Instance_Of
418 N : Node_Id) return Boolean;
419 -- Inner is instantiated within the generic Outer. Check whether Inner
420 -- directly or indirectly contains an instance of Outer or of one of its
421 -- parents, in the case of a subunit. Each generic unit holds a list of
422 -- the entities instantiated within (at any depth). This procedure
423 -- determines whether the set of such lists contains a cycle, i.e. an
424 -- illegal circular instantiation.
426 function Denotes_Formal_Package
428 On_Exit : Boolean := False;
429 Instance : Entity_Id := Empty) return Boolean;
430 -- Returns True if E is a formal package of an enclosing generic, or
431 -- the actual for such a formal in an enclosing instantiation. If such
432 -- a package is used as a formal in an nested generic, or as an actual
433 -- in a nested instantiation, the visibility of ITS formals should not
434 -- be modified. When called from within Restore_Private_Views, the flag
435 -- On_Exit is true, to indicate that the search for a possible enclosing
436 -- instance should ignore the current one. In that case Instance denotes
437 -- the declaration for which this is an actual. This declaration may be
438 -- an instantiation in the source, or the internal instantiation that
439 -- corresponds to the actual for a formal package.
441 function Find_Actual_Type
443 Gen_Type : Entity_Id) return Entity_Id;
444 -- When validating the actual types of a child instance, check whether
445 -- the formal is a formal type of the parent unit, and retrieve the current
446 -- actual for it. Typ is the entity in the analyzed formal type declaration
447 -- (component or index type of an array type, or designated type of an
448 -- access formal) and Gen_Type is the enclosing analyzed formal array
449 -- or access type. The desired actual may be a formal of a parent, or may
450 -- be declared in a formal package of a parent. In both cases it is a
451 -- generic actual type because it appears within a visible instance.
452 -- Finally, it may be declared in a parent unit without being a formal
453 -- of that unit, in which case it must be retrieved by visibility.
454 -- Ambiguities may still arise if two homonyms are declared in two formal
455 -- packages, and the prefix of the formal type may be needed to resolve
456 -- the ambiguity in the instance ???
458 function In_Same_Declarative_Part
460 Inst : Node_Id) return Boolean;
461 -- True if the instantiation Inst and the given freeze_node F_Node appear
462 -- within the same declarative part, ignoring subunits, but with no inter-
463 -- vening subprograms or concurrent units. If true, the freeze node
464 -- of the instance can be placed after the freeze node of the parent,
465 -- which it itself an instance.
467 function In_Main_Context (E : Entity_Id) return Boolean;
468 -- Check whether an instantiation is in the context of the main unit.
469 -- Used to determine whether its body should be elaborated to allow
470 -- front-end inlining.
472 function Is_Generic_Formal (E : Entity_Id) return Boolean;
473 -- Utility to determine whether a given entity is declared by means of
474 -- of a formal parameter declaration. Used to set properly the visibility
475 -- of generic formals of a generic package declared with a box or with
476 -- partial parametrization.
478 procedure Set_Instance_Env
479 (Gen_Unit : Entity_Id;
480 Act_Unit : Entity_Id);
481 -- Save current instance on saved environment, to be used to determine
482 -- the global status of entities in nested instances. Part of Save_Env.
483 -- called after verifying that the generic unit is legal for the instance,
484 -- The procedure also examines whether the generic unit is a predefined
485 -- unit, in order to set configuration switches accordingly. As a result
486 -- the procedure must be called after analyzing and freezing the actuals.
488 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
489 -- Associate analyzed generic parameter with corresponding
490 -- instance. Used for semantic checks at instantiation time.
492 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
493 -- Traverse the Exchanged_Views list to see if a type was private
494 -- and has already been flipped during this phase of instantiation.
496 procedure Hide_Current_Scope;
497 -- When instantiating a generic child unit, the parent context must be
498 -- present, but the instance and all entities that may be generated
499 -- must be inserted in the current scope. We leave the current scope
500 -- on the stack, but make its entities invisible to avoid visibility
501 -- problems. This is reversed at the end of the instantiation. This is
502 -- not done for the instantiation of the bodies, which only require the
503 -- instances of the generic parents to be in scope.
505 procedure Install_Body
510 -- If the instantiation happens textually before the body of the generic,
511 -- the instantiation of the body must be analyzed after the generic body,
512 -- and not at the point of instantiation. Such early instantiations can
513 -- happen if the generic and the instance appear in a package declaration
514 -- because the generic body can only appear in the corresponding package
515 -- body. Early instantiations can also appear if generic, instance and
516 -- body are all in the declarative part of a subprogram or entry. Entities
517 -- of packages that are early instantiations are delayed, and their freeze
518 -- node appears after the generic body.
520 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
521 -- Insert freeze node at the end of the declarative part that includes the
522 -- instance node N. If N is in the visible part of an enclosing package
523 -- declaration, the freeze node has to be inserted at the end of the
524 -- private declarations, if any.
526 procedure Freeze_Subprogram_Body
527 (Inst_Node : Node_Id;
529 Pack_Id : Entity_Id);
530 -- The generic body may appear textually after the instance, including
531 -- in the proper body of a stub, or within a different package instance.
532 -- Given that the instance can only be elaborated after the generic, we
533 -- place freeze_nodes for the instance and/or for packages that may enclose
534 -- the instance and the generic, so that the back-end can establish the
535 -- proper order of elaboration.
538 -- Establish environment for subsequent instantiation. Separated from
539 -- Save_Env because data-structures for visibility handling must be
540 -- initialized before call to Check_Generic_Child_Unit.
542 procedure Install_Formal_Packages (Par : Entity_Id);
543 -- Install the visible part of any formal of the parent that is a formal
544 -- package. Note that for the case of a formal package with a box, this
545 -- includes the formal part of the formal package (12.7(10/2)).
547 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
548 -- When compiling an instance of a child unit the parent (which is
549 -- itself an instance) is an enclosing scope that must be made
550 -- immediately visible. This procedure is also used to install the non-
551 -- generic parent of a generic child unit when compiling its body, so
552 -- that full views of types in the parent are made visible.
554 procedure Remove_Parent (In_Body : Boolean := False);
555 -- Reverse effect after instantiation of child is complete
557 procedure Inline_Instance_Body
559 Gen_Unit : Entity_Id;
561 -- If front-end inlining is requested, instantiate the package body,
562 -- and preserve the visibility of its compilation unit, to insure
563 -- that successive instantiations succeed.
565 -- The functions Instantiate_XXX perform various legality checks and build
566 -- the declarations for instantiated generic parameters. In all of these
567 -- Formal is the entity in the generic unit, Actual is the entity of
568 -- expression in the generic associations, and Analyzed_Formal is the
569 -- formal in the generic copy, which contains the semantic information to
570 -- be used to validate the actual.
572 function Instantiate_Object
575 Analyzed_Formal : Node_Id) return List_Id;
577 function Instantiate_Type
580 Analyzed_Formal : Node_Id;
581 Actual_Decls : List_Id) return List_Id;
583 function Instantiate_Formal_Subprogram
586 Analyzed_Formal : Node_Id) return Node_Id;
588 function Instantiate_Formal_Package
591 Analyzed_Formal : Node_Id) return List_Id;
592 -- If the formal package is declared with a box, special visibility rules
593 -- apply to its formals: they are in the visible part of the package. This
594 -- is true in the declarative region of the formal package, that is to say
595 -- in the enclosing generic or instantiation. For an instantiation, the
596 -- parameters of the formal package are made visible in an explicit step.
597 -- Furthermore, if the actual has a visible USE clause, these formals must
598 -- be made potentially use-visible as well. On exit from the enclosing
599 -- instantiation, the reverse must be done.
601 -- For a formal package declared without a box, there are conformance rules
602 -- that apply to the actuals in the generic declaration and the actuals of
603 -- the actual package in the enclosing instantiation. The simplest way to
604 -- apply these rules is to repeat the instantiation of the formal package
605 -- in the context of the enclosing instance, and compare the generic
606 -- associations of this instantiation with those of the actual package.
607 -- This internal instantiation only needs to contain the renamings of the
608 -- formals: the visible and private declarations themselves need not be
611 -- In Ada 2005, the formal package may be only partially parameterized.
612 -- In that case the visibility step must make visible those actuals whose
613 -- corresponding formals were given with a box. A final complication
614 -- involves inherited operations from formal derived types, which must
615 -- be visible if the type is.
617 function Is_In_Main_Unit (N : Node_Id) return Boolean;
618 -- Test if given node is in the main unit
620 procedure Load_Parent_Of_Generic
623 Body_Optional : Boolean := False);
624 -- If the generic appears in a separate non-generic library unit, load the
625 -- corresponding body to retrieve the body of the generic. N is the node
626 -- for the generic instantiation, Spec is the generic package declaration.
628 -- Body_Optional is a flag that indicates that the body is being loaded to
629 -- ensure that temporaries are generated consistently when there are other
630 -- instances in the current declarative part that precede the one being
631 -- loaded. In that case a missing body is acceptable.
633 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
634 -- Add the context clause of the unit containing a generic unit to a
635 -- compilation unit that is, or contains, an instantiation.
637 function Get_Associated_Node (N : Node_Id) return Node_Id;
638 -- In order to propagate semantic information back from the analyzed copy
639 -- to the original generic, we maintain links between selected nodes in the
640 -- generic and their corresponding copies. At the end of generic analysis,
641 -- the routine Save_Global_References traverses the generic tree, examines
642 -- the semantic information, and preserves the links to those nodes that
643 -- contain global information. At instantiation, the information from the
644 -- associated node is placed on the new copy, so that name resolution is
647 -- Three kinds of source nodes have associated nodes:
649 -- a) those that can reference (denote) entities, that is identifiers,
650 -- character literals, expanded_names, operator symbols, operators,
651 -- and attribute reference nodes. These nodes have an Entity field
652 -- and are the set of nodes that are in N_Has_Entity.
654 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
656 -- c) selected components (N_Selected_Component)
658 -- For the first class, the associated node preserves the entity if it is
659 -- global. If the generic contains nested instantiations, the associated
660 -- node itself has been recopied, and a chain of them must be followed.
662 -- For aggregates, the associated node allows retrieval of the type, which
663 -- may otherwise not appear in the generic. The view of this type may be
664 -- different between generic and instantiation, and the full view can be
665 -- installed before the instantiation is analyzed. For aggregates of type
666 -- extensions, the same view exchange may have to be performed for some of
667 -- the ancestor types, if their view is private at the point of
670 -- Nodes that are selected components in the parse tree may be rewritten
671 -- as expanded names after resolution, and must be treated as potential
672 -- entity holders, which is why they also have an Associated_Node.
674 -- Nodes that do not come from source, such as freeze nodes, do not appear
675 -- in the generic tree, and need not have an associated node.
677 -- The associated node is stored in the Associated_Node field. Note that
678 -- this field overlaps Entity, which is fine, because the whole point is
679 -- that we don't need or want the normal Entity field in this situation.
681 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
682 -- Within the generic part, entities in the formal package are
683 -- visible. To validate subsequent type declarations, indicate
684 -- the correspondence between the entities in the analyzed formal,
685 -- and the entities in the actual package. There are three packages
686 -- involved in the instantiation of a formal package: the parent
687 -- generic P1 which appears in the generic declaration, the fake
688 -- instantiation P2 which appears in the analyzed generic, and whose
689 -- visible entities may be used in subsequent formals, and the actual
690 -- P3 in the instance. To validate subsequent formals, me indicate
691 -- that the entities in P2 are mapped into those of P3. The mapping of
692 -- entities has to be done recursively for nested packages.
694 procedure Move_Freeze_Nodes
698 -- Freeze nodes can be generated in the analysis of a generic unit, but
699 -- will not be seen by the back-end. It is necessary to move those nodes
700 -- to the enclosing scope if they freeze an outer entity. We place them
701 -- at the end of the enclosing generic package, which is semantically
704 procedure Preanalyze_Actuals (N : Node_Id);
705 -- Analyze actuals to perform name resolution. Full resolution is done
706 -- later, when the expected types are known, but names have to be captured
707 -- before installing parents of generics, that are not visible for the
708 -- actuals themselves.
710 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
711 -- Verify that an attribute that appears as the default for a formal
712 -- subprogram is a function or procedure with the correct profile.
714 -------------------------------------------
715 -- Data Structures for Generic Renamings --
716 -------------------------------------------
718 -- The map Generic_Renamings associates generic entities with their
719 -- corresponding actuals. Currently used to validate type instances. It
720 -- will eventually be used for all generic parameters to eliminate the
721 -- need for overload resolution in the instance.
723 type Assoc_Ptr is new Int;
725 Assoc_Null : constant Assoc_Ptr := -1;
730 Next_In_HTable : Assoc_Ptr;
733 package Generic_Renamings is new Table.Table
734 (Table_Component_Type => Assoc,
735 Table_Index_Type => Assoc_Ptr,
736 Table_Low_Bound => 0,
738 Table_Increment => 100,
739 Table_Name => "Generic_Renamings");
741 -- Variable to hold enclosing instantiation. When the environment is
742 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
744 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
746 -- Hash table for associations
748 HTable_Size : constant := 37;
749 type HTable_Range is range 0 .. HTable_Size - 1;
751 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
752 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
753 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
754 function Hash (F : Entity_Id) return HTable_Range;
756 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
757 Header_Num => HTable_Range,
759 Elmt_Ptr => Assoc_Ptr,
760 Null_Ptr => Assoc_Null,
761 Set_Next => Set_Next_Assoc,
764 Get_Key => Get_Gen_Id,
768 Exchanged_Views : Elist_Id;
769 -- This list holds the private views that have been exchanged during
770 -- instantiation to restore the visibility of the generic declaration.
771 -- (see comments above). After instantiation, the current visibility is
772 -- reestablished by means of a traversal of this list.
774 Hidden_Entities : Elist_Id;
775 -- This list holds the entities of the current scope that are removed
776 -- from immediate visibility when instantiating a child unit. Their
777 -- visibility is restored in Remove_Parent.
779 -- Because instantiations can be recursive, the following must be saved
780 -- on entry and restored on exit from an instantiation (spec or body).
781 -- This is done by the two procedures Save_Env and Restore_Env. For
782 -- package and subprogram instantiations (but not for the body instances)
783 -- the action of Save_Env is done in two steps: Init_Env is called before
784 -- Check_Generic_Child_Unit, because setting the parent instances requires
785 -- that the visibility data structures be properly initialized. Once the
786 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
788 Parent_Unit_Visible : Boolean := False;
789 -- Parent_Unit_Visible is used when the generic is a child unit, and
790 -- indicates whether the ultimate parent of the generic is visible in the
791 -- instantiation environment. It is used to reset the visibility of the
792 -- parent at the end of the instantiation (see Remove_Parent).
794 Instance_Parent_Unit : Entity_Id := Empty;
795 -- This records the ultimate parent unit of an instance of a generic
796 -- child unit and is used in conjunction with Parent_Unit_Visible to
797 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
799 type Instance_Env is record
800 Instantiated_Parent : Assoc;
801 Exchanged_Views : Elist_Id;
802 Hidden_Entities : Elist_Id;
803 Current_Sem_Unit : Unit_Number_Type;
804 Parent_Unit_Visible : Boolean := False;
805 Instance_Parent_Unit : Entity_Id := Empty;
806 Switches : Config_Switches_Type;
809 package Instance_Envs is new Table.Table (
810 Table_Component_Type => Instance_Env,
811 Table_Index_Type => Int,
812 Table_Low_Bound => 0,
814 Table_Increment => 100,
815 Table_Name => "Instance_Envs");
817 procedure Restore_Private_Views
818 (Pack_Id : Entity_Id;
819 Is_Package : Boolean := True);
820 -- Restore the private views of external types, and unmark the generic
821 -- renamings of actuals, so that they become compatible subtypes again.
822 -- For subprograms, Pack_Id is the package constructed to hold the
825 procedure Switch_View (T : Entity_Id);
826 -- Switch the partial and full views of a type and its private
827 -- dependents (i.e. its subtypes and derived types).
829 ------------------------------------
830 -- Structures for Error Reporting --
831 ------------------------------------
833 Instantiation_Node : Node_Id;
834 -- Used by subprograms that validate instantiation of formal parameters
835 -- where there might be no actual on which to place the error message.
836 -- Also used to locate the instantiation node for generic subunits.
838 Instantiation_Error : exception;
839 -- When there is a semantic error in the generic parameter matching,
840 -- there is no point in continuing the instantiation, because the
841 -- number of cascaded errors is unpredictable. This exception aborts
842 -- the instantiation process altogether.
844 S_Adjustment : Sloc_Adjustment;
845 -- Offset created for each node in an instantiation, in order to keep
846 -- track of the source position of the instantiation in each of its nodes.
847 -- A subsequent semantic error or warning on a construct of the instance
848 -- points to both places: the original generic node, and the point of
849 -- instantiation. See Sinput and Sinput.L for additional details.
851 ------------------------------------------------------------
852 -- Data structure for keeping track when inside a Generic --
853 ------------------------------------------------------------
855 -- The following table is used to save values of the Inside_A_Generic
856 -- flag (see spec of Sem) when they are saved by Start_Generic.
858 package Generic_Flags is new Table.Table (
859 Table_Component_Type => Boolean,
860 Table_Index_Type => Int,
861 Table_Low_Bound => 0,
863 Table_Increment => 200,
864 Table_Name => "Generic_Flags");
866 ---------------------------
867 -- Abandon_Instantiation --
868 ---------------------------
870 procedure Abandon_Instantiation (N : Node_Id) is
872 Error_Msg_N ("\instantiation abandoned!", N);
873 raise Instantiation_Error;
874 end Abandon_Instantiation;
876 --------------------------
877 -- Analyze_Associations --
878 --------------------------
880 function Analyze_Associations
883 F_Copy : List_Id) return List_Id
886 Actual_Types : constant Elist_Id := New_Elmt_List;
887 Assoc : constant List_Id := New_List;
888 Default_Actuals : constant Elist_Id := New_Elmt_List;
889 Gen_Unit : constant Entity_Id :=
890 Defining_Entity (Parent (F_Copy));
895 Next_Formal : Node_Id;
896 Temp_Formal : Node_Id;
897 Analyzed_Formal : Node_Id;
900 First_Named : Node_Id := Empty;
902 Default_Formals : constant List_Id := New_List;
903 -- If an Others_Choice is present, some of the formals may be defaulted.
904 -- To simplify the treatment of visibility in an instance, we introduce
905 -- individual defaults for each such formal. These defaults are
906 -- appended to the list of associations and replace the Others_Choice.
908 Found_Assoc : Node_Id;
909 -- Association for the current formal being match. Empty if there are
910 -- no remaining actuals, or if there is no named association with the
911 -- name of the formal.
913 Is_Named_Assoc : Boolean;
914 Num_Matched : Int := 0;
915 Num_Actuals : Int := 0;
917 Others_Present : Boolean := False;
918 -- In Ada 2005, indicates partial parametrization of a formal
919 -- package. As usual an other association must be last in the list.
921 function Matching_Actual
923 A_F : Entity_Id) return Node_Id;
924 -- Find actual that corresponds to a given a formal parameter. If the
925 -- actuals are positional, return the next one, if any. If the actuals
926 -- are named, scan the parameter associations to find the right one.
927 -- A_F is the corresponding entity in the analyzed generic,which is
928 -- placed on the selector name for ASIS use.
930 -- In Ada 2005, a named association may be given with a box, in which
931 -- case Matching_Actual sets Found_Assoc to the generic association,
932 -- but return Empty for the actual itself. In this case the code below
933 -- creates a corresponding declaration for the formal.
935 function Partial_Parametrization return Boolean;
936 -- Ada 2005: if no match is found for a given formal, check if the
937 -- association for it includes a box, or whether the associations
938 -- include an Others clause.
940 procedure Process_Default (F : Entity_Id);
941 -- Add a copy of the declaration of generic formal F to the list of
942 -- associations, and add an explicit box association for F if there
943 -- is none yet, and the default comes from an Others_Choice.
945 procedure Set_Analyzed_Formal;
946 -- Find the node in the generic copy that corresponds to a given formal.
947 -- The semantic information on this node is used to perform legality
948 -- checks on the actuals. Because semantic analysis can introduce some
949 -- anonymous entities or modify the declaration node itself, the
950 -- correspondence between the two lists is not one-one. In addition to
951 -- anonymous types, the presence a formal equality will introduce an
952 -- implicit declaration for the corresponding inequality.
954 ---------------------
955 -- Matching_Actual --
956 ---------------------
958 function Matching_Actual
960 A_F : Entity_Id) return Node_Id
966 Is_Named_Assoc := False;
968 -- End of list of purely positional parameters
970 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
971 Found_Assoc := Empty;
974 -- Case of positional parameter corresponding to current formal
976 elsif No (Selector_Name (Actual)) then
977 Found_Assoc := Actual;
978 Act := Explicit_Generic_Actual_Parameter (Actual);
979 Num_Matched := Num_Matched + 1;
982 -- Otherwise scan list of named actuals to find the one with the
983 -- desired name. All remaining actuals have explicit names.
986 Is_Named_Assoc := True;
987 Found_Assoc := Empty;
991 while Present (Actual) loop
992 if Chars (Selector_Name (Actual)) = Chars (F) then
993 Set_Entity (Selector_Name (Actual), A_F);
994 Set_Etype (Selector_Name (Actual), Etype (A_F));
995 Generate_Reference (A_F, Selector_Name (Actual));
996 Found_Assoc := Actual;
997 Act := Explicit_Generic_Actual_Parameter (Actual);
998 Num_Matched := Num_Matched + 1;
1006 -- Reset for subsequent searches. In most cases the named
1007 -- associations are in order. If they are not, we reorder them
1008 -- to avoid scanning twice the same actual. This is not just a
1009 -- question of efficiency: there may be multiple defaults with
1010 -- boxes that have the same name. In a nested instantiation we
1011 -- insert actuals for those defaults, and cannot rely on their
1012 -- names to disambiguate them.
1014 if Actual = First_Named then
1017 elsif Present (Actual) then
1018 Insert_Before (First_Named, Remove_Next (Prev));
1021 Actual := First_Named;
1024 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1025 Set_Used_As_Generic_Actual (Entity (Act));
1029 end Matching_Actual;
1031 -----------------------------
1032 -- Partial_Parametrization --
1033 -----------------------------
1035 function Partial_Parametrization return Boolean is
1037 return Others_Present
1038 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1039 end Partial_Parametrization;
1041 ---------------------
1042 -- Process_Default --
1043 ---------------------
1045 procedure Process_Default (F : Entity_Id) is
1046 Loc : constant Source_Ptr := Sloc (I_Node);
1047 F_Id : constant Entity_Id := Defining_Entity (F);
1053 -- Append copy of formal declaration to associations, and create new
1054 -- defining identifier for it.
1056 Decl := New_Copy_Tree (F);
1057 Id := Make_Defining_Identifier (Sloc (F_Id), Chars => Chars (F_Id));
1059 if Nkind (F) in N_Formal_Subprogram_Declaration then
1060 Set_Defining_Unit_Name (Specification (Decl), Id);
1063 Set_Defining_Identifier (Decl, Id);
1066 Append (Decl, Assoc);
1068 if No (Found_Assoc) then
1070 Make_Generic_Association (Loc,
1071 Selector_Name => New_Occurrence_Of (Id, Loc),
1072 Explicit_Generic_Actual_Parameter => Empty);
1073 Set_Box_Present (Default);
1074 Append (Default, Default_Formals);
1076 end Process_Default;
1078 -------------------------
1079 -- Set_Analyzed_Formal --
1080 -------------------------
1082 procedure Set_Analyzed_Formal is
1086 while Present (Analyzed_Formal) loop
1087 Kind := Nkind (Analyzed_Formal);
1089 case Nkind (Formal) is
1091 when N_Formal_Subprogram_Declaration =>
1092 exit when Kind in N_Formal_Subprogram_Declaration
1095 (Defining_Unit_Name (Specification (Formal))) =
1097 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1099 when N_Formal_Package_Declaration =>
1100 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1101 N_Generic_Package_Declaration,
1102 N_Package_Declaration);
1104 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1108 -- Skip freeze nodes, and nodes inserted to replace
1109 -- unrecognized pragmas.
1112 Kind not in N_Formal_Subprogram_Declaration
1113 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1117 and then Chars (Defining_Identifier (Formal)) =
1118 Chars (Defining_Identifier (Analyzed_Formal));
1121 Next (Analyzed_Formal);
1123 end Set_Analyzed_Formal;
1125 -- Start of processing for Analyze_Associations
1128 Actuals := Generic_Associations (I_Node);
1130 if Present (Actuals) then
1132 -- Check for an Others choice, indicating a partial parametrization
1133 -- for a formal package.
1135 Actual := First (Actuals);
1136 while Present (Actual) loop
1137 if Nkind (Actual) = N_Others_Choice then
1138 Others_Present := True;
1140 if Present (Next (Actual)) then
1141 Error_Msg_N ("others must be last association", Actual);
1144 -- This subprogram is used both for formal packages and for
1145 -- instantiations. For the latter, associations must all be
1148 if Nkind (I_Node) /= N_Formal_Package_Declaration
1149 and then Comes_From_Source (I_Node)
1152 ("others association not allowed in an instance",
1156 -- In any case, nothing to do after the others association
1160 elsif Box_Present (Actual)
1161 and then Comes_From_Source (I_Node)
1162 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1165 ("box association not allowed in an instance", Actual);
1171 -- If named associations are present, save first named association
1172 -- (it may of course be Empty) to facilitate subsequent name search.
1174 First_Named := First (Actuals);
1175 while Present (First_Named)
1176 and then Nkind (First_Named) /= N_Others_Choice
1177 and then No (Selector_Name (First_Named))
1179 Num_Actuals := Num_Actuals + 1;
1184 Named := First_Named;
1185 while Present (Named) loop
1186 if Nkind (Named) /= N_Others_Choice
1187 and then No (Selector_Name (Named))
1189 Error_Msg_N ("invalid positional actual after named one", Named);
1190 Abandon_Instantiation (Named);
1193 -- A named association may lack an actual parameter, if it was
1194 -- introduced for a default subprogram that turns out to be local
1195 -- to the outer instantiation.
1197 if Nkind (Named) /= N_Others_Choice
1198 and then Present (Explicit_Generic_Actual_Parameter (Named))
1200 Num_Actuals := Num_Actuals + 1;
1206 if Present (Formals) then
1207 Formal := First_Non_Pragma (Formals);
1208 Analyzed_Formal := First_Non_Pragma (F_Copy);
1210 if Present (Actuals) then
1211 Actual := First (Actuals);
1213 -- All formals should have default values
1219 while Present (Formal) loop
1220 Set_Analyzed_Formal;
1221 Next_Formal := Next_Non_Pragma (Formal);
1223 case Nkind (Formal) is
1224 when N_Formal_Object_Declaration =>
1227 Defining_Identifier (Formal),
1228 Defining_Identifier (Analyzed_Formal));
1230 if No (Match) and then Partial_Parametrization then
1231 Process_Default (Formal);
1234 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1238 when N_Formal_Type_Declaration =>
1241 Defining_Identifier (Formal),
1242 Defining_Identifier (Analyzed_Formal));
1245 if Partial_Parametrization then
1246 Process_Default (Formal);
1249 Error_Msg_Sloc := Sloc (Gen_Unit);
1253 Defining_Identifier (Formal));
1254 Error_Msg_NE ("\in instantiation of & declared#",
1255 Instantiation_Node, Gen_Unit);
1256 Abandon_Instantiation (Instantiation_Node);
1263 (Formal, Match, Analyzed_Formal, Assoc),
1266 -- An instantiation is a freeze point for the actuals,
1267 -- unless this is a rewritten formal package.
1269 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1270 Append_Elmt (Entity (Match), Actual_Types);
1274 -- A remote access-to-class-wide type must not be an
1275 -- actual parameter for a generic formal of an access
1276 -- type (E.2.2 (17)).
1278 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1280 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1281 N_Access_To_Object_Definition
1283 Validate_Remote_Access_To_Class_Wide_Type (Match);
1286 when N_Formal_Subprogram_Declaration =>
1289 Defining_Unit_Name (Specification (Formal)),
1290 Defining_Unit_Name (Specification (Analyzed_Formal)));
1292 -- If the formal subprogram has the same name as another
1293 -- formal subprogram of the generic, then a named
1294 -- association is illegal (12.3(9)). Exclude named
1295 -- associations that are generated for a nested instance.
1298 and then Is_Named_Assoc
1299 and then Comes_From_Source (Found_Assoc)
1301 Temp_Formal := First (Formals);
1302 while Present (Temp_Formal) loop
1303 if Nkind (Temp_Formal) in
1304 N_Formal_Subprogram_Declaration
1305 and then Temp_Formal /= Formal
1307 Chars (Selector_Name (Found_Assoc)) =
1308 Chars (Defining_Unit_Name
1309 (Specification (Temp_Formal)))
1312 ("name not allowed for overloaded formal",
1314 Abandon_Instantiation (Instantiation_Node);
1321 -- If there is no corresponding actual, this may be case of
1322 -- partial parametrization, or else the formal has a default
1326 and then Partial_Parametrization
1328 Process_Default (Formal);
1331 Instantiate_Formal_Subprogram
1332 (Formal, Match, Analyzed_Formal));
1335 -- If this is a nested generic, preserve default for later
1339 and then Box_Present (Formal)
1342 (Defining_Unit_Name (Specification (Last (Assoc))),
1346 when N_Formal_Package_Declaration =>
1349 Defining_Identifier (Formal),
1350 Defining_Identifier (Original_Node (Analyzed_Formal)));
1353 if Partial_Parametrization then
1354 Process_Default (Formal);
1357 Error_Msg_Sloc := Sloc (Gen_Unit);
1360 Instantiation_Node, Defining_Identifier (Formal));
1361 Error_Msg_NE ("\in instantiation of & declared#",
1362 Instantiation_Node, Gen_Unit);
1364 Abandon_Instantiation (Instantiation_Node);
1370 (Instantiate_Formal_Package
1371 (Formal, Match, Analyzed_Formal),
1375 -- For use type and use package appearing in the generic part,
1376 -- we have already copied them, so we can just move them where
1377 -- they belong (we mustn't recopy them since this would mess up
1378 -- the Sloc values).
1380 when N_Use_Package_Clause |
1381 N_Use_Type_Clause =>
1382 if Nkind (Original_Node (I_Node)) =
1383 N_Formal_Package_Declaration
1385 Append (New_Copy_Tree (Formal), Assoc);
1388 Append (Formal, Assoc);
1392 raise Program_Error;
1396 Formal := Next_Formal;
1397 Next_Non_Pragma (Analyzed_Formal);
1400 if Num_Actuals > Num_Matched then
1401 Error_Msg_Sloc := Sloc (Gen_Unit);
1403 if Present (Selector_Name (Actual)) then
1405 ("unmatched actual&",
1406 Actual, Selector_Name (Actual));
1407 Error_Msg_NE ("\in instantiation of& declared#",
1411 ("unmatched actual in instantiation of& declared#",
1416 elsif Present (Actuals) then
1418 ("too many actuals in generic instantiation", Instantiation_Node);
1422 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1424 while Present (Elmt) loop
1425 Freeze_Before (I_Node, Node (Elmt));
1430 -- If there are default subprograms, normalize the tree by adding
1431 -- explicit associations for them. This is required if the instance
1432 -- appears within a generic.
1440 Elmt := First_Elmt (Default_Actuals);
1441 while Present (Elmt) loop
1442 if No (Actuals) then
1443 Actuals := New_List;
1444 Set_Generic_Associations (I_Node, Actuals);
1447 Subp := Node (Elmt);
1449 Make_Generic_Association (Sloc (Subp),
1450 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1451 Explicit_Generic_Actual_Parameter =>
1452 New_Occurrence_Of (Subp, Sloc (Subp)));
1453 Mark_Rewrite_Insertion (New_D);
1454 Append_To (Actuals, New_D);
1459 -- If this is a formal package, normalize the parameter list by adding
1460 -- explicit box associations for the formals that are covered by an
1463 if not Is_Empty_List (Default_Formals) then
1464 Append_List (Default_Formals, Formals);
1468 end Analyze_Associations;
1470 -------------------------------
1471 -- Analyze_Formal_Array_Type --
1472 -------------------------------
1474 procedure Analyze_Formal_Array_Type
1475 (T : in out Entity_Id;
1481 -- Treated like a non-generic array declaration, with additional
1486 if Nkind (Def) = N_Constrained_Array_Definition then
1487 DSS := First (Discrete_Subtype_Definitions (Def));
1488 while Present (DSS) loop
1489 if Nkind_In (DSS, N_Subtype_Indication,
1491 N_Attribute_Reference)
1493 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1500 Array_Type_Declaration (T, Def);
1501 Set_Is_Generic_Type (Base_Type (T));
1503 if Ekind (Component_Type (T)) = E_Incomplete_Type
1504 and then No (Full_View (Component_Type (T)))
1506 Error_Msg_N ("premature usage of incomplete type", Def);
1508 -- Check that range constraint is not allowed on the component type
1509 -- of a generic formal array type (AARM 12.5.3(3))
1511 elsif Is_Internal (Component_Type (T))
1512 and then Present (Subtype_Indication (Component_Definition (Def)))
1513 and then Nkind (Original_Node
1514 (Subtype_Indication (Component_Definition (Def)))) =
1515 N_Subtype_Indication
1518 ("in a formal, a subtype indication can only be "
1519 & "a subtype mark (RM 12.5.3(3))",
1520 Subtype_Indication (Component_Definition (Def)));
1523 end Analyze_Formal_Array_Type;
1525 ---------------------------------------------
1526 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1527 ---------------------------------------------
1529 -- As for other generic types, we create a valid type representation with
1530 -- legal but arbitrary attributes, whose values are never considered
1531 -- static. For all scalar types we introduce an anonymous base type, with
1532 -- the same attributes. We choose the corresponding integer type to be
1533 -- Standard_Integer.
1535 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1539 Loc : constant Source_Ptr := Sloc (Def);
1540 Base : constant Entity_Id :=
1542 (E_Decimal_Fixed_Point_Type,
1543 Current_Scope, Sloc (Def), 'G');
1544 Int_Base : constant Entity_Id := Standard_Integer;
1545 Delta_Val : constant Ureal := Ureal_1;
1546 Digs_Val : constant Uint := Uint_6;
1551 Set_Etype (Base, Base);
1552 Set_Size_Info (Base, Int_Base);
1553 Set_RM_Size (Base, RM_Size (Int_Base));
1554 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1555 Set_Digits_Value (Base, Digs_Val);
1556 Set_Delta_Value (Base, Delta_Val);
1557 Set_Small_Value (Base, Delta_Val);
1558 Set_Scalar_Range (Base,
1560 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1561 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1563 Set_Is_Generic_Type (Base);
1564 Set_Parent (Base, Parent (Def));
1566 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1567 Set_Etype (T, Base);
1568 Set_Size_Info (T, Int_Base);
1569 Set_RM_Size (T, RM_Size (Int_Base));
1570 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1571 Set_Digits_Value (T, Digs_Val);
1572 Set_Delta_Value (T, Delta_Val);
1573 Set_Small_Value (T, Delta_Val);
1574 Set_Scalar_Range (T, Scalar_Range (Base));
1575 Set_Is_Constrained (T);
1577 Check_Restriction (No_Fixed_Point, Def);
1578 end Analyze_Formal_Decimal_Fixed_Point_Type;
1580 -------------------------------------------
1581 -- Analyze_Formal_Derived_Interface_Type --
1582 -------------------------------------------
1584 procedure Analyze_Formal_Derived_Interface_Type
1589 Loc : constant Source_Ptr := Sloc (Def);
1592 -- Rewrite as a type declaration of a derived type. This ensures that
1593 -- the interface list and primitive operations are properly captured.
1596 Make_Full_Type_Declaration (Loc,
1597 Defining_Identifier => T,
1598 Type_Definition => Def));
1600 Set_Is_Generic_Type (T);
1601 end Analyze_Formal_Derived_Interface_Type;
1603 ---------------------------------
1604 -- Analyze_Formal_Derived_Type --
1605 ---------------------------------
1607 procedure Analyze_Formal_Derived_Type
1612 Loc : constant Source_Ptr := Sloc (Def);
1613 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1617 Set_Is_Generic_Type (T);
1619 if Private_Present (Def) then
1621 Make_Private_Extension_Declaration (Loc,
1622 Defining_Identifier => T,
1623 Discriminant_Specifications => Discriminant_Specifications (N),
1624 Unknown_Discriminants_Present => Unk_Disc,
1625 Subtype_Indication => Subtype_Mark (Def),
1626 Interface_List => Interface_List (Def));
1628 Set_Abstract_Present (New_N, Abstract_Present (Def));
1629 Set_Limited_Present (New_N, Limited_Present (Def));
1630 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1634 Make_Full_Type_Declaration (Loc,
1635 Defining_Identifier => T,
1636 Discriminant_Specifications =>
1637 Discriminant_Specifications (Parent (T)),
1639 Make_Derived_Type_Definition (Loc,
1640 Subtype_Indication => Subtype_Mark (Def)));
1642 Set_Abstract_Present
1643 (Type_Definition (New_N), Abstract_Present (Def));
1645 (Type_Definition (New_N), Limited_Present (Def));
1652 if not Is_Composite_Type (T) then
1654 ("unknown discriminants not allowed for elementary types", N);
1656 Set_Has_Unknown_Discriminants (T);
1657 Set_Is_Constrained (T, False);
1661 -- If the parent type has a known size, so does the formal, which makes
1662 -- legal representation clauses that involve the formal.
1664 Set_Size_Known_At_Compile_Time
1665 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1666 end Analyze_Formal_Derived_Type;
1668 ----------------------------------
1669 -- Analyze_Formal_Discrete_Type --
1670 ----------------------------------
1672 -- The operations defined for a discrete types are those of an enumeration
1673 -- type. The size is set to an arbitrary value, for use in analyzing the
1676 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1677 Loc : constant Source_Ptr := Sloc (Def);
1681 Base : constant Entity_Id :=
1683 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1686 Set_Ekind (T, E_Enumeration_Subtype);
1687 Set_Etype (T, Base);
1690 Set_Is_Generic_Type (T);
1691 Set_Is_Constrained (T);
1693 -- For semantic analysis, the bounds of the type must be set to some
1694 -- non-static value. The simplest is to create attribute nodes for those
1695 -- bounds, that refer to the type itself. These bounds are never
1696 -- analyzed but serve as place-holders.
1699 Make_Attribute_Reference (Loc,
1700 Attribute_Name => Name_First,
1701 Prefix => New_Reference_To (T, Loc));
1705 Make_Attribute_Reference (Loc,
1706 Attribute_Name => Name_Last,
1707 Prefix => New_Reference_To (T, Loc));
1710 Set_Scalar_Range (T,
1715 Set_Ekind (Base, E_Enumeration_Type);
1716 Set_Etype (Base, Base);
1717 Init_Size (Base, 8);
1718 Init_Alignment (Base);
1719 Set_Is_Generic_Type (Base);
1720 Set_Scalar_Range (Base, Scalar_Range (T));
1721 Set_Parent (Base, Parent (Def));
1722 end Analyze_Formal_Discrete_Type;
1724 ----------------------------------
1725 -- Analyze_Formal_Floating_Type --
1726 ---------------------------------
1728 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1729 Base : constant Entity_Id :=
1731 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1734 -- The various semantic attributes are taken from the predefined type
1735 -- Float, just so that all of them are initialized. Their values are
1736 -- never used because no constant folding or expansion takes place in
1737 -- the generic itself.
1740 Set_Ekind (T, E_Floating_Point_Subtype);
1741 Set_Etype (T, Base);
1742 Set_Size_Info (T, (Standard_Float));
1743 Set_RM_Size (T, RM_Size (Standard_Float));
1744 Set_Digits_Value (T, Digits_Value (Standard_Float));
1745 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1746 Set_Is_Constrained (T);
1748 Set_Is_Generic_Type (Base);
1749 Set_Etype (Base, Base);
1750 Set_Size_Info (Base, (Standard_Float));
1751 Set_RM_Size (Base, RM_Size (Standard_Float));
1752 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1753 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1754 Set_Parent (Base, Parent (Def));
1756 Check_Restriction (No_Floating_Point, Def);
1757 end Analyze_Formal_Floating_Type;
1759 -----------------------------------
1760 -- Analyze_Formal_Interface_Type;--
1761 -----------------------------------
1763 procedure Analyze_Formal_Interface_Type
1768 Loc : constant Source_Ptr := Sloc (N);
1773 Make_Full_Type_Declaration (Loc,
1774 Defining_Identifier => T,
1775 Type_Definition => Def);
1779 Set_Is_Generic_Type (T);
1780 end Analyze_Formal_Interface_Type;
1782 ---------------------------------
1783 -- Analyze_Formal_Modular_Type --
1784 ---------------------------------
1786 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1788 -- Apart from their entity kind, generic modular types are treated like
1789 -- signed integer types, and have the same attributes.
1791 Analyze_Formal_Signed_Integer_Type (T, Def);
1792 Set_Ekind (T, E_Modular_Integer_Subtype);
1793 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1795 end Analyze_Formal_Modular_Type;
1797 ---------------------------------------
1798 -- Analyze_Formal_Object_Declaration --
1799 ---------------------------------------
1801 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1802 E : constant Node_Id := Default_Expression (N);
1803 Id : constant Node_Id := Defining_Identifier (N);
1810 -- Determine the mode of the formal object
1812 if Out_Present (N) then
1813 K := E_Generic_In_Out_Parameter;
1815 if not In_Present (N) then
1816 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1820 K := E_Generic_In_Parameter;
1823 if Present (Subtype_Mark (N)) then
1824 Find_Type (Subtype_Mark (N));
1825 T := Entity (Subtype_Mark (N));
1827 -- Verify that there is no redundant null exclusion
1829 if Null_Exclusion_Present (N) then
1830 if not Is_Access_Type (T) then
1832 ("null exclusion can only apply to an access type", N);
1834 elsif Can_Never_Be_Null (T) then
1836 ("`NOT NULL` not allowed (& already excludes null)",
1841 -- Ada 2005 (AI-423): Formal object with an access definition
1844 Check_Access_Definition (N);
1845 T := Access_Definition
1847 N => Access_Definition (N));
1850 if Ekind (T) = E_Incomplete_Type then
1852 Error_Node : Node_Id;
1855 if Present (Subtype_Mark (N)) then
1856 Error_Node := Subtype_Mark (N);
1858 Check_Access_Definition (N);
1859 Error_Node := Access_Definition (N);
1862 Error_Msg_N ("premature usage of incomplete type", Error_Node);
1866 if K = E_Generic_In_Parameter then
1868 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1870 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1872 ("generic formal of mode IN must not be of limited type", N);
1873 Explain_Limited_Type (T, N);
1876 if Is_Abstract_Type (T) then
1878 ("generic formal of mode IN must not be of abstract type", N);
1882 Preanalyze_Spec_Expression (E, T);
1884 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
1886 ("initialization not allowed for limited types", E);
1887 Explain_Limited_Type (T, E);
1894 -- Case of generic IN OUT parameter
1897 -- If the formal has an unconstrained type, construct its actual
1898 -- subtype, as is done for subprogram formals. In this fashion, all
1899 -- its uses can refer to specific bounds.
1904 if (Is_Array_Type (T)
1905 and then not Is_Constrained (T))
1907 (Ekind (T) = E_Record_Type
1908 and then Has_Discriminants (T))
1911 Non_Freezing_Ref : constant Node_Id :=
1912 New_Reference_To (Id, Sloc (Id));
1916 -- Make sure the actual subtype doesn't generate bogus freezing
1918 Set_Must_Not_Freeze (Non_Freezing_Ref);
1919 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1920 Insert_Before_And_Analyze (N, Decl);
1921 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1924 Set_Actual_Subtype (Id, T);
1929 ("initialization not allowed for `IN OUT` formals", N);
1932 end Analyze_Formal_Object_Declaration;
1934 ----------------------------------------------
1935 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1936 ----------------------------------------------
1938 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1942 Loc : constant Source_Ptr := Sloc (Def);
1943 Base : constant Entity_Id :=
1945 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1947 -- The semantic attributes are set for completeness only, their values
1948 -- will never be used, since all properties of the type are non-static.
1951 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1952 Set_Etype (T, Base);
1953 Set_Size_Info (T, Standard_Integer);
1954 Set_RM_Size (T, RM_Size (Standard_Integer));
1955 Set_Small_Value (T, Ureal_1);
1956 Set_Delta_Value (T, Ureal_1);
1957 Set_Scalar_Range (T,
1959 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1960 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1961 Set_Is_Constrained (T);
1963 Set_Is_Generic_Type (Base);
1964 Set_Etype (Base, Base);
1965 Set_Size_Info (Base, Standard_Integer);
1966 Set_RM_Size (Base, RM_Size (Standard_Integer));
1967 Set_Small_Value (Base, Ureal_1);
1968 Set_Delta_Value (Base, Ureal_1);
1969 Set_Scalar_Range (Base, Scalar_Range (T));
1970 Set_Parent (Base, Parent (Def));
1972 Check_Restriction (No_Fixed_Point, Def);
1973 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1975 ----------------------------
1976 -- Analyze_Formal_Package --
1977 ----------------------------
1979 procedure Analyze_Formal_Package (N : Node_Id) is
1980 Loc : constant Source_Ptr := Sloc (N);
1981 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1983 Gen_Id : constant Node_Id := Name (N);
1985 Gen_Unit : Entity_Id;
1987 Parent_Installed : Boolean := False;
1989 Parent_Instance : Entity_Id;
1990 Renaming_In_Par : Entity_Id;
1991 No_Associations : Boolean := False;
1993 function Build_Local_Package return Node_Id;
1994 -- The formal package is rewritten so that its parameters are replaced
1995 -- with corresponding declarations. For parameters with bona fide
1996 -- associations these declarations are created by Analyze_Associations
1997 -- as for a regular instantiation. For boxed parameters, we preserve
1998 -- the formal declarations and analyze them, in order to introduce
1999 -- entities of the right kind in the environment of the formal.
2001 -------------------------
2002 -- Build_Local_Package --
2003 -------------------------
2005 function Build_Local_Package return Node_Id is
2007 Pack_Decl : Node_Id;
2010 -- Within the formal, the name of the generic package is a renaming
2011 -- of the formal (as for a regular instantiation).
2014 Make_Package_Declaration (Loc,
2017 (Specification (Original_Node (Gen_Decl)),
2018 Empty, Instantiating => True));
2020 Renaming := Make_Package_Renaming_Declaration (Loc,
2021 Defining_Unit_Name =>
2022 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2023 Name => New_Occurrence_Of (Formal, Loc));
2025 if Nkind (Gen_Id) = N_Identifier
2026 and then Chars (Gen_Id) = Chars (Pack_Id)
2029 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2032 -- If the formal is declared with a box, or with an others choice,
2033 -- create corresponding declarations for all entities in the formal
2034 -- part, so that names with the proper types are available in the
2035 -- specification of the formal package.
2037 -- On the other hand, if there are no associations, then all the
2038 -- formals must have defaults, and this will be checked by the
2039 -- call to Analyze_Associations.
2042 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2045 Formal_Decl : Node_Id;
2048 -- TBA : for a formal package, need to recurse ???
2053 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2054 while Present (Formal_Decl) loop
2056 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2061 -- If generic associations are present, use Analyze_Associations to
2062 -- create the proper renaming declarations.
2066 Act_Tree : constant Node_Id :=
2068 (Original_Node (Gen_Decl), Empty,
2069 Instantiating => True);
2072 Generic_Renamings.Set_Last (0);
2073 Generic_Renamings_HTable.Reset;
2074 Instantiation_Node := N;
2077 Analyze_Associations
2079 Generic_Formal_Declarations (Act_Tree),
2080 Generic_Formal_Declarations (Gen_Decl));
2084 Append (Renaming, To => Decls);
2086 -- Add generated declarations ahead of local declarations in
2089 if No (Visible_Declarations (Specification (Pack_Decl))) then
2090 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2093 (First (Visible_Declarations (Specification (Pack_Decl))),
2098 end Build_Local_Package;
2100 -- Start of processing for Analyze_Formal_Package
2103 Text_IO_Kludge (Gen_Id);
2106 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2107 Gen_Unit := Entity (Gen_Id);
2109 -- Check for a formal package that is a package renaming
2111 if Present (Renamed_Object (Gen_Unit)) then
2112 Gen_Unit := Renamed_Object (Gen_Unit);
2115 if Ekind (Gen_Unit) /= E_Generic_Package then
2116 Error_Msg_N ("expect generic package name", Gen_Id);
2120 elsif Gen_Unit = Current_Scope then
2122 ("generic package cannot be used as a formal package of itself",
2127 elsif In_Open_Scopes (Gen_Unit) then
2128 if Is_Compilation_Unit (Gen_Unit)
2129 and then Is_Child_Unit (Current_Scope)
2131 -- Special-case the error when the formal is a parent, and
2132 -- continue analysis to minimize cascaded errors.
2135 ("generic parent cannot be used as formal package "
2136 & "of a child unit",
2141 ("generic package cannot be used as a formal package "
2150 or else No (Generic_Associations (N))
2151 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2153 No_Associations := True;
2156 -- If there are no generic associations, the generic parameters appear
2157 -- as local entities and are instantiated like them. We copy the generic
2158 -- package declaration as if it were an instantiation, and analyze it
2159 -- like a regular package, except that we treat the formals as
2160 -- additional visible components.
2162 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2164 if In_Extended_Main_Source_Unit (N) then
2165 Set_Is_Instantiated (Gen_Unit);
2166 Generate_Reference (Gen_Unit, N);
2169 Formal := New_Copy (Pack_Id);
2170 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2173 -- Make local generic without formals. The formals will be replaced
2174 -- with internal declarations.
2176 New_N := Build_Local_Package;
2178 -- If there are errors in the parameter list, Analyze_Associations
2179 -- raises Instantiation_Error. Patch the declaration to prevent
2180 -- further exception propagation.
2183 when Instantiation_Error =>
2185 Enter_Name (Formal);
2186 Set_Ekind (Formal, E_Variable);
2187 Set_Etype (Formal, Any_Type);
2189 if Parent_Installed then
2197 Set_Defining_Unit_Name (Specification (New_N), Formal);
2198 Set_Generic_Parent (Specification (N), Gen_Unit);
2199 Set_Instance_Env (Gen_Unit, Formal);
2200 Set_Is_Generic_Instance (Formal);
2202 Enter_Name (Formal);
2203 Set_Ekind (Formal, E_Package);
2204 Set_Etype (Formal, Standard_Void_Type);
2205 Set_Inner_Instances (Formal, New_Elmt_List);
2206 Push_Scope (Formal);
2208 if Is_Child_Unit (Gen_Unit)
2209 and then Parent_Installed
2211 -- Similarly, we have to make the name of the formal visible in the
2212 -- parent instance, to resolve properly fully qualified names that
2213 -- may appear in the generic unit. The parent instance has been
2214 -- placed on the scope stack ahead of the current scope.
2216 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2219 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2220 Set_Ekind (Renaming_In_Par, E_Package);
2221 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2222 Set_Scope (Renaming_In_Par, Parent_Instance);
2223 Set_Parent (Renaming_In_Par, Parent (Formal));
2224 Set_Renamed_Object (Renaming_In_Par, Formal);
2225 Append_Entity (Renaming_In_Par, Parent_Instance);
2228 Analyze (Specification (N));
2230 -- The formals for which associations are provided are not visible
2231 -- outside of the formal package. The others are still declared by a
2232 -- formal parameter declaration.
2234 if not No_Associations then
2239 E := First_Entity (Formal);
2240 while Present (E) loop
2241 exit when Ekind (E) = E_Package
2242 and then Renamed_Entity (E) = Formal;
2244 if not Is_Generic_Formal (E) then
2253 End_Package_Scope (Formal);
2255 if Parent_Installed then
2261 -- Inside the generic unit, the formal package is a regular package, but
2262 -- no body is needed for it. Note that after instantiation, the defining
2263 -- unit name we need is in the new tree and not in the original (see
2264 -- Package_Instantiation). A generic formal package is an instance, and
2265 -- can be used as an actual for an inner instance.
2267 Set_Has_Completion (Formal, True);
2269 -- Add semantic information to the original defining identifier.
2272 Set_Ekind (Pack_Id, E_Package);
2273 Set_Etype (Pack_Id, Standard_Void_Type);
2274 Set_Scope (Pack_Id, Scope (Formal));
2275 Set_Has_Completion (Pack_Id, True);
2276 end Analyze_Formal_Package;
2278 ---------------------------------
2279 -- Analyze_Formal_Private_Type --
2280 ---------------------------------
2282 procedure Analyze_Formal_Private_Type
2288 New_Private_Type (N, T, Def);
2290 -- Set the size to an arbitrary but legal value
2292 Set_Size_Info (T, Standard_Integer);
2293 Set_RM_Size (T, RM_Size (Standard_Integer));
2294 end Analyze_Formal_Private_Type;
2296 ----------------------------------------
2297 -- Analyze_Formal_Signed_Integer_Type --
2298 ----------------------------------------
2300 procedure Analyze_Formal_Signed_Integer_Type
2304 Base : constant Entity_Id :=
2306 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
2311 Set_Ekind (T, E_Signed_Integer_Subtype);
2312 Set_Etype (T, Base);
2313 Set_Size_Info (T, Standard_Integer);
2314 Set_RM_Size (T, RM_Size (Standard_Integer));
2315 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2316 Set_Is_Constrained (T);
2318 Set_Is_Generic_Type (Base);
2319 Set_Size_Info (Base, Standard_Integer);
2320 Set_RM_Size (Base, RM_Size (Standard_Integer));
2321 Set_Etype (Base, Base);
2322 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2323 Set_Parent (Base, Parent (Def));
2324 end Analyze_Formal_Signed_Integer_Type;
2326 -------------------------------
2327 -- Analyze_Formal_Subprogram --
2328 -------------------------------
2330 procedure Analyze_Formal_Subprogram (N : Node_Id) is
2331 Spec : constant Node_Id := Specification (N);
2332 Def : constant Node_Id := Default_Name (N);
2333 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2341 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2342 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2346 Analyze_Subprogram_Declaration (N);
2347 Set_Is_Formal_Subprogram (Nam);
2348 Set_Has_Completion (Nam);
2350 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2351 Set_Is_Abstract_Subprogram (Nam);
2352 Set_Is_Dispatching_Operation (Nam);
2355 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2357 if No (Ctrl_Type) then
2359 ("abstract formal subprogram must have a controlling type",
2362 Check_Controlling_Formals (Ctrl_Type, Nam);
2367 -- Default name is resolved at the point of instantiation
2369 if Box_Present (N) then
2372 -- Else default is bound at the point of generic declaration
2374 elsif Present (Def) then
2375 if Nkind (Def) = N_Operator_Symbol then
2376 Find_Direct_Name (Def);
2378 elsif Nkind (Def) /= N_Attribute_Reference then
2382 -- For an attribute reference, analyze the prefix and verify
2383 -- that it has the proper profile for the subprogram.
2385 Analyze (Prefix (Def));
2386 Valid_Default_Attribute (Nam, Def);
2390 -- Default name may be overloaded, in which case the interpretation
2391 -- with the correct profile must be selected, as for a renaming.
2392 -- If the definition is an indexed component, it must denote a
2393 -- member of an entry family. If it is a selected component, it
2394 -- can be a protected operation.
2396 if Etype (Def) = Any_Type then
2399 elsif Nkind (Def) = N_Selected_Component then
2400 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2401 Error_Msg_N ("expect valid subprogram name as default", Def);
2404 elsif Nkind (Def) = N_Indexed_Component then
2405 if Is_Entity_Name (Prefix (Def)) then
2406 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2407 Error_Msg_N ("expect valid subprogram name as default", Def);
2410 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2411 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2414 Error_Msg_N ("expect valid subprogram name as default", Def);
2418 Error_Msg_N ("expect valid subprogram name as default", Def);
2422 elsif Nkind (Def) = N_Character_Literal then
2424 -- Needs some type checks: subprogram should be parameterless???
2426 Resolve (Def, (Etype (Nam)));
2428 elsif not Is_Entity_Name (Def)
2429 or else not Is_Overloadable (Entity (Def))
2431 Error_Msg_N ("expect valid subprogram name as default", Def);
2434 elsif not Is_Overloaded (Def) then
2435 Subp := Entity (Def);
2438 Error_Msg_N ("premature usage of formal subprogram", Def);
2440 elsif not Entity_Matches_Spec (Subp, Nam) then
2441 Error_Msg_N ("no visible entity matches specification", Def);
2444 -- More than one interpretation, so disambiguate as for a renaming
2449 I1 : Interp_Index := 0;
2455 Get_First_Interp (Def, I, It);
2456 while Present (It.Nam) loop
2457 if Entity_Matches_Spec (It.Nam, Nam) then
2458 if Subp /= Any_Id then
2459 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2461 if It1 = No_Interp then
2462 Error_Msg_N ("ambiguous default subprogram", Def);
2475 Get_Next_Interp (I, It);
2479 if Subp /= Any_Id then
2480 Set_Entity (Def, Subp);
2483 Error_Msg_N ("premature usage of formal subprogram", Def);
2485 elsif Ekind (Subp) /= E_Operator then
2486 Check_Mode_Conformant (Subp, Nam);
2490 Error_Msg_N ("no visible subprogram matches specification", N);
2494 end Analyze_Formal_Subprogram;
2496 -------------------------------------
2497 -- Analyze_Formal_Type_Declaration --
2498 -------------------------------------
2500 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2501 Def : constant Node_Id := Formal_Type_Definition (N);
2505 T := Defining_Identifier (N);
2507 if Present (Discriminant_Specifications (N))
2508 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2511 ("discriminants not allowed for this formal type", T);
2514 -- Enter the new name, and branch to specific routine
2517 when N_Formal_Private_Type_Definition =>
2518 Analyze_Formal_Private_Type (N, T, Def);
2520 when N_Formal_Derived_Type_Definition =>
2521 Analyze_Formal_Derived_Type (N, T, Def);
2523 when N_Formal_Discrete_Type_Definition =>
2524 Analyze_Formal_Discrete_Type (T, Def);
2526 when N_Formal_Signed_Integer_Type_Definition =>
2527 Analyze_Formal_Signed_Integer_Type (T, Def);
2529 when N_Formal_Modular_Type_Definition =>
2530 Analyze_Formal_Modular_Type (T, Def);
2532 when N_Formal_Floating_Point_Definition =>
2533 Analyze_Formal_Floating_Type (T, Def);
2535 when N_Formal_Ordinary_Fixed_Point_Definition =>
2536 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2538 when N_Formal_Decimal_Fixed_Point_Definition =>
2539 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2541 when N_Array_Type_Definition =>
2542 Analyze_Formal_Array_Type (T, Def);
2544 when N_Access_To_Object_Definition |
2545 N_Access_Function_Definition |
2546 N_Access_Procedure_Definition =>
2547 Analyze_Generic_Access_Type (T, Def);
2549 -- Ada 2005: a interface declaration is encoded as an abstract
2550 -- record declaration or a abstract type derivation.
2552 when N_Record_Definition =>
2553 Analyze_Formal_Interface_Type (N, T, Def);
2555 when N_Derived_Type_Definition =>
2556 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2562 raise Program_Error;
2566 Set_Is_Generic_Type (T);
2567 end Analyze_Formal_Type_Declaration;
2569 ------------------------------------
2570 -- Analyze_Function_Instantiation --
2571 ------------------------------------
2573 procedure Analyze_Function_Instantiation (N : Node_Id) is
2575 Analyze_Subprogram_Instantiation (N, E_Function);
2576 end Analyze_Function_Instantiation;
2578 ---------------------------------
2579 -- Analyze_Generic_Access_Type --
2580 ---------------------------------
2582 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2586 if Nkind (Def) = N_Access_To_Object_Definition then
2587 Access_Type_Declaration (T, Def);
2589 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2590 and then No (Full_View (Designated_Type (T)))
2591 and then not Is_Generic_Type (Designated_Type (T))
2593 Error_Msg_N ("premature usage of incomplete type", Def);
2595 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
2597 ("only a subtype mark is allowed in a formal", Def);
2601 Access_Subprogram_Declaration (T, Def);
2603 end Analyze_Generic_Access_Type;
2605 ---------------------------------
2606 -- Analyze_Generic_Formal_Part --
2607 ---------------------------------
2609 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2610 Gen_Parm_Decl : Node_Id;
2613 -- The generic formals are processed in the scope of the generic unit,
2614 -- where they are immediately visible. The scope is installed by the
2617 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2619 while Present (Gen_Parm_Decl) loop
2620 Analyze (Gen_Parm_Decl);
2621 Next (Gen_Parm_Decl);
2624 Generate_Reference_To_Generic_Formals (Current_Scope);
2625 end Analyze_Generic_Formal_Part;
2627 ------------------------------------------
2628 -- Analyze_Generic_Package_Declaration --
2629 ------------------------------------------
2631 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2632 Loc : constant Source_Ptr := Sloc (N);
2635 Save_Parent : Node_Id;
2637 Decls : constant List_Id :=
2638 Visible_Declarations (Specification (N));
2642 -- We introduce a renaming of the enclosing package, to have a usable
2643 -- entity as the prefix of an expanded name for a local entity of the
2644 -- form Par.P.Q, where P is the generic package. This is because a local
2645 -- entity named P may hide it, so that the usual visibility rules in
2646 -- the instance will not resolve properly.
2649 Make_Package_Renaming_Declaration (Loc,
2650 Defining_Unit_Name =>
2651 Make_Defining_Identifier (Loc,
2652 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2653 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2655 if Present (Decls) then
2656 Decl := First (Decls);
2657 while Present (Decl)
2658 and then Nkind (Decl) = N_Pragma
2663 if Present (Decl) then
2664 Insert_Before (Decl, Renaming);
2666 Append (Renaming, Visible_Declarations (Specification (N)));
2670 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2673 -- Create copy of generic unit, and save for instantiation. If the unit
2674 -- is a child unit, do not copy the specifications for the parent, which
2675 -- are not part of the generic tree.
2677 Save_Parent := Parent_Spec (N);
2678 Set_Parent_Spec (N, Empty);
2680 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2681 Set_Parent_Spec (New_N, Save_Parent);
2683 Id := Defining_Entity (N);
2684 Generate_Definition (Id);
2686 -- Expansion is not applied to generic units
2691 Set_Ekind (Id, E_Generic_Package);
2692 Set_Etype (Id, Standard_Void_Type);
2694 Enter_Generic_Scope (Id);
2695 Set_Inner_Instances (Id, New_Elmt_List);
2697 Set_Categorization_From_Pragmas (N);
2698 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2700 -- Link the declaration of the generic homonym in the generic copy to
2701 -- the package it renames, so that it is always resolved properly.
2703 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2704 Set_Entity (Associated_Node (Name (Renaming)), Id);
2706 -- For a library unit, we have reconstructed the entity for the unit,
2707 -- and must reset it in the library tables.
2709 if Nkind (Parent (N)) = N_Compilation_Unit then
2710 Set_Cunit_Entity (Current_Sem_Unit, Id);
2713 Analyze_Generic_Formal_Part (N);
2715 -- After processing the generic formals, analysis proceeds as for a
2716 -- non-generic package.
2718 Analyze (Specification (N));
2720 Validate_Categorization_Dependency (N, Id);
2724 End_Package_Scope (Id);
2725 Exit_Generic_Scope (Id);
2727 if Nkind (Parent (N)) /= N_Compilation_Unit then
2728 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2729 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2730 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2733 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2734 Validate_RT_RAT_Component (N);
2736 -- If this is a spec without a body, check that generic parameters
2739 if not Body_Required (Parent (N)) then
2740 Check_References (Id);
2743 end Analyze_Generic_Package_Declaration;
2745 --------------------------------------------
2746 -- Analyze_Generic_Subprogram_Declaration --
2747 --------------------------------------------
2749 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2754 Result_Type : Entity_Id;
2755 Save_Parent : Node_Id;
2759 -- Create copy of generic unit, and save for instantiation. If the unit
2760 -- is a child unit, do not copy the specifications for the parent, which
2761 -- are not part of the generic tree.
2763 Save_Parent := Parent_Spec (N);
2764 Set_Parent_Spec (N, Empty);
2766 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2767 Set_Parent_Spec (New_N, Save_Parent);
2770 Spec := Specification (N);
2771 Id := Defining_Entity (Spec);
2772 Generate_Definition (Id);
2774 if Nkind (Id) = N_Defining_Operator_Symbol then
2776 ("operator symbol not allowed for generic subprogram", Id);
2783 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2785 Enter_Generic_Scope (Id);
2786 Set_Inner_Instances (Id, New_Elmt_List);
2787 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2789 Analyze_Generic_Formal_Part (N);
2791 Formals := Parameter_Specifications (Spec);
2793 if Present (Formals) then
2794 Process_Formals (Formals, Spec);
2797 if Nkind (Spec) = N_Function_Specification then
2798 Set_Ekind (Id, E_Generic_Function);
2800 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
2801 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
2802 Set_Etype (Id, Result_Type);
2804 -- Check restriction imposed by AI05-073: a generic function
2805 -- cannot return an abstract type or an access to such.
2807 -- This is a binding interpreration should it apply to earlier
2808 -- versions of Ada as well as Ada 2012???
2810 if Is_Abstract_Type (Designated_Type (Result_Type))
2811 and then Ada_Version >= Ada_12
2813 Error_Msg_N ("generic function cannot have an access result"
2814 & " that designates an abstract type", Spec);
2818 Find_Type (Result_Definition (Spec));
2819 Typ := Entity (Result_Definition (Spec));
2821 if Is_Abstract_Type (Typ)
2822 and then Ada_Version >= Ada_12
2825 ("generic function cannot have abstract result type", Spec);
2828 -- If a null exclusion is imposed on the result type, then create
2829 -- a null-excluding itype (an access subtype) and use it as the
2830 -- function's Etype.
2832 if Is_Access_Type (Typ)
2833 and then Null_Exclusion_Present (Spec)
2836 Create_Null_Excluding_Itype
2838 Related_Nod => Spec,
2839 Scope_Id => Defining_Unit_Name (Spec)));
2841 Set_Etype (Id, Typ);
2846 Set_Ekind (Id, E_Generic_Procedure);
2847 Set_Etype (Id, Standard_Void_Type);
2850 -- For a library unit, we have reconstructed the entity for the unit,
2851 -- and must reset it in the library tables. We also make sure that
2852 -- Body_Required is set properly in the original compilation unit node.
2854 if Nkind (Parent (N)) = N_Compilation_Unit then
2855 Set_Cunit_Entity (Current_Sem_Unit, Id);
2856 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2859 Set_Categorization_From_Pragmas (N);
2860 Validate_Categorization_Dependency (N, Id);
2862 Save_Global_References (Original_Node (N));
2866 Exit_Generic_Scope (Id);
2867 Generate_Reference_To_Formals (Id);
2868 end Analyze_Generic_Subprogram_Declaration;
2870 -----------------------------------
2871 -- Analyze_Package_Instantiation --
2872 -----------------------------------
2874 procedure Analyze_Package_Instantiation (N : Node_Id) is
2875 Loc : constant Source_Ptr := Sloc (N);
2876 Gen_Id : constant Node_Id := Name (N);
2879 Act_Decl_Name : Node_Id;
2880 Act_Decl_Id : Entity_Id;
2885 Gen_Unit : Entity_Id;
2887 Is_Actual_Pack : constant Boolean :=
2888 Is_Internal (Defining_Entity (N));
2890 Env_Installed : Boolean := False;
2891 Parent_Installed : Boolean := False;
2892 Renaming_List : List_Id;
2893 Unit_Renaming : Node_Id;
2894 Needs_Body : Boolean;
2895 Inline_Now : Boolean := False;
2897 procedure Delay_Descriptors (E : Entity_Id);
2898 -- Delay generation of subprogram descriptors for given entity
2900 function Might_Inline_Subp return Boolean;
2901 -- If inlining is active and the generic contains inlined subprograms,
2902 -- we instantiate the body. This may cause superfluous instantiations,
2903 -- but it is simpler than detecting the need for the body at the point
2904 -- of inlining, when the context of the instance is not available.
2906 -----------------------
2907 -- Delay_Descriptors --
2908 -----------------------
2910 procedure Delay_Descriptors (E : Entity_Id) is
2912 if not Delay_Subprogram_Descriptors (E) then
2913 Set_Delay_Subprogram_Descriptors (E);
2914 Pending_Descriptor.Append (E);
2916 end Delay_Descriptors;
2918 -----------------------
2919 -- Might_Inline_Subp --
2920 -----------------------
2922 function Might_Inline_Subp return Boolean is
2926 if not Inline_Processing_Required then
2930 E := First_Entity (Gen_Unit);
2931 while Present (E) loop
2932 if Is_Subprogram (E)
2933 and then Is_Inlined (E)
2943 end Might_Inline_Subp;
2945 -- Start of processing for Analyze_Package_Instantiation
2948 -- Very first thing: apply the special kludge for Text_IO processing
2949 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2951 Text_IO_Kludge (Name (N));
2953 -- Make node global for error reporting
2955 Instantiation_Node := N;
2957 -- Case of instantiation of a generic package
2959 if Nkind (N) = N_Package_Instantiation then
2960 Act_Decl_Id := New_Copy (Defining_Entity (N));
2961 Set_Comes_From_Source (Act_Decl_Id, True);
2963 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2965 Make_Defining_Program_Unit_Name (Loc,
2966 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2967 Defining_Identifier => Act_Decl_Id);
2969 Act_Decl_Name := Act_Decl_Id;
2972 -- Case of instantiation of a formal package
2975 Act_Decl_Id := Defining_Identifier (N);
2976 Act_Decl_Name := Act_Decl_Id;
2979 Generate_Definition (Act_Decl_Id);
2980 Preanalyze_Actuals (N);
2983 Env_Installed := True;
2985 -- Reset renaming map for formal types. The mapping is established
2986 -- when analyzing the generic associations, but some mappings are
2987 -- inherited from formal packages of parent units, and these are
2988 -- constructed when the parents are installed.
2990 Generic_Renamings.Set_Last (0);
2991 Generic_Renamings_HTable.Reset;
2993 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2994 Gen_Unit := Entity (Gen_Id);
2996 -- Verify that it is the name of a generic package
2998 -- A visibility glitch: if the instance is a child unit and the generic
2999 -- is the generic unit of a parent instance (i.e. both the parent and
3000 -- the child units are instances of the same package) the name now
3001 -- denotes the renaming within the parent, not the intended generic
3002 -- unit. See if there is a homonym that is the desired generic. The
3003 -- renaming declaration must be visible inside the instance of the
3004 -- child, but not when analyzing the name in the instantiation itself.
3006 if Ekind (Gen_Unit) = E_Package
3007 and then Present (Renamed_Entity (Gen_Unit))
3008 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3009 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3010 and then Present (Homonym (Gen_Unit))
3012 Gen_Unit := Homonym (Gen_Unit);
3015 if Etype (Gen_Unit) = Any_Type then
3019 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3021 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3023 if From_With_Type (Gen_Unit) then
3025 ("cannot instantiate a limited withed package", Gen_Id);
3028 ("expect name of generic package in instantiation", Gen_Id);
3035 if In_Extended_Main_Source_Unit (N) then
3036 Set_Is_Instantiated (Gen_Unit);
3037 Generate_Reference (Gen_Unit, N);
3039 if Present (Renamed_Object (Gen_Unit)) then
3040 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3041 Generate_Reference (Renamed_Object (Gen_Unit), N);
3045 if Nkind (Gen_Id) = N_Identifier
3046 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3049 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3051 elsif Nkind (Gen_Id) = N_Expanded_Name
3052 and then Is_Child_Unit (Gen_Unit)
3053 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3054 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3057 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3060 Set_Entity (Gen_Id, Gen_Unit);
3062 -- If generic is a renaming, get original generic unit
3064 if Present (Renamed_Object (Gen_Unit))
3065 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3067 Gen_Unit := Renamed_Object (Gen_Unit);
3070 -- Verify that there are no circular instantiations
3072 if In_Open_Scopes (Gen_Unit) then
3073 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3077 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3078 Error_Msg_Node_2 := Current_Scope;
3080 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3081 Circularity_Detected := True;
3086 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3088 -- Initialize renamings map, for error checking, and the list that
3089 -- holds private entities whose views have changed between generic
3090 -- definition and instantiation. If this is the instance created to
3091 -- validate an actual package, the instantiation environment is that
3092 -- of the enclosing instance.
3094 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3096 -- Copy original generic tree, to produce text for instantiation
3100 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3102 Act_Spec := Specification (Act_Tree);
3104 -- If this is the instance created to validate an actual package,
3105 -- only the formals matter, do not examine the package spec itself.
3107 if Is_Actual_Pack then
3108 Set_Visible_Declarations (Act_Spec, New_List);
3109 Set_Private_Declarations (Act_Spec, New_List);
3113 Analyze_Associations
3115 Generic_Formal_Declarations (Act_Tree),
3116 Generic_Formal_Declarations (Gen_Decl));
3118 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3119 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3120 Set_Is_Generic_Instance (Act_Decl_Id);
3122 Set_Generic_Parent (Act_Spec, Gen_Unit);
3124 -- References to the generic in its own declaration or its body are
3125 -- references to the instance. Add a renaming declaration for the
3126 -- generic unit itself. This declaration, as well as the renaming
3127 -- declarations for the generic formals, must remain private to the
3128 -- unit: the formals, because this is the language semantics, and
3129 -- the unit because its use is an artifact of the implementation.
3132 Make_Package_Renaming_Declaration (Loc,
3133 Defining_Unit_Name =>
3134 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3135 Name => New_Reference_To (Act_Decl_Id, Loc));
3137 Append (Unit_Renaming, Renaming_List);
3139 -- The renaming declarations are the first local declarations of
3142 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3144 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3146 Set_Visible_Declarations (Act_Spec, Renaming_List);
3150 Make_Package_Declaration (Loc,
3151 Specification => Act_Spec);
3153 -- Save the instantiation node, for subsequent instantiation of the
3154 -- body, if there is one and we are generating code for the current
3155 -- unit. Mark the unit as having a body, to avoid a premature error
3158 -- We instantiate the body if we are generating code, if we are
3159 -- generating cross-reference information, or if we are building
3160 -- trees for ASIS use.
3163 Enclosing_Body_Present : Boolean := False;
3164 -- If the generic unit is not a compilation unit, then a body may
3165 -- be present in its parent even if none is required. We create a
3166 -- tentative pending instantiation for the body, which will be
3167 -- discarded if none is actually present.
3172 if Scope (Gen_Unit) /= Standard_Standard
3173 and then not Is_Child_Unit (Gen_Unit)
3175 Scop := Scope (Gen_Unit);
3177 while Present (Scop)
3178 and then Scop /= Standard_Standard
3180 if Unit_Requires_Body (Scop) then
3181 Enclosing_Body_Present := True;
3184 elsif In_Open_Scopes (Scop)
3185 and then In_Package_Body (Scop)
3187 Enclosing_Body_Present := True;
3191 exit when Is_Compilation_Unit (Scop);
3192 Scop := Scope (Scop);
3196 -- If front-end inlining is enabled, and this is a unit for which
3197 -- code will be generated, we instantiate the body at once.
3199 -- This is done if the instance is not the main unit, and if the
3200 -- generic is not a child unit of another generic, to avoid scope
3201 -- problems and the reinstallation of parent instances.
3204 and then (not Is_Child_Unit (Gen_Unit)
3205 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3206 and then Might_Inline_Subp
3207 and then not Is_Actual_Pack
3209 if Front_End_Inlining
3210 and then (Is_In_Main_Unit (N)
3211 or else In_Main_Context (Current_Scope))
3212 and then Nkind (Parent (N)) /= N_Compilation_Unit
3216 -- In configurable_run_time mode we force the inlining of
3217 -- predefined subprograms marked Inline_Always, to minimize
3218 -- the use of the run-time library.
3220 elsif Is_Predefined_File_Name
3221 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3222 and then Configurable_Run_Time_Mode
3223 and then Nkind (Parent (N)) /= N_Compilation_Unit
3228 -- If the current scope is itself an instance within a child
3229 -- unit, there will be duplications in the scope stack, and the
3230 -- unstacking mechanism in Inline_Instance_Body will fail.
3231 -- This loses some rare cases of optimization, and might be
3232 -- improved some day, if we can find a proper abstraction for
3233 -- "the complete compilation context" that can be saved and
3236 if Is_Generic_Instance (Current_Scope) then
3238 Curr_Unit : constant Entity_Id :=
3239 Cunit_Entity (Current_Sem_Unit);
3241 if Curr_Unit /= Current_Scope
3242 and then Is_Child_Unit (Curr_Unit)
3244 Inline_Now := False;
3251 (Unit_Requires_Body (Gen_Unit)
3252 or else Enclosing_Body_Present
3253 or else Present (Corresponding_Body (Gen_Decl)))
3254 and then (Is_In_Main_Unit (N)
3255 or else Might_Inline_Subp)
3256 and then not Is_Actual_Pack
3257 and then not Inline_Now
3258 and then (Operating_Mode = Generate_Code
3259 or else (Operating_Mode = Check_Semantics
3260 and then ASIS_Mode));
3262 -- If front_end_inlining is enabled, do not instantiate body if
3263 -- within a generic context.
3265 if (Front_End_Inlining
3266 and then not Expander_Active)
3267 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3269 Needs_Body := False;
3272 -- If the current context is generic, and the package being
3273 -- instantiated is declared within a formal package, there is no
3274 -- body to instantiate until the enclosing generic is instantiated
3275 -- and there is an actual for the formal package. If the formal
3276 -- package has parameters, we build a regular package instance for
3277 -- it, that precedes the original formal package declaration.
3279 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3281 Decl : constant Node_Id :=
3283 (Unit_Declaration_Node (Scope (Gen_Unit)));
3285 if Nkind (Decl) = N_Formal_Package_Declaration
3286 or else (Nkind (Decl) = N_Package_Declaration
3287 and then Is_List_Member (Decl)
3288 and then Present (Next (Decl))
3290 Nkind (Next (Decl)) =
3291 N_Formal_Package_Declaration)
3293 Needs_Body := False;
3299 -- If we are generating the calling stubs from the instantiation of
3300 -- a generic RCI package, we will not use the body of the generic
3303 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3304 and then Is_Compilation_Unit (Defining_Entity (N))
3306 Needs_Body := False;
3311 -- Here is a defence against a ludicrous number of instantiations
3312 -- caused by a circular set of instantiation attempts.
3314 if Pending_Instantiations.Last >
3315 Hostparm.Max_Instantiations
3317 Error_Msg_N ("too many instantiations", N);
3318 raise Unrecoverable_Error;
3321 -- Indicate that the enclosing scopes contain an instantiation,
3322 -- and that cleanup actions should be delayed until after the
3323 -- instance body is expanded.
3325 Check_Forward_Instantiation (Gen_Decl);
3326 if Nkind (N) = N_Package_Instantiation then
3328 Enclosing_Master : Entity_Id;
3331 -- Loop to search enclosing masters
3333 Enclosing_Master := Current_Scope;
3334 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3335 if Ekind (Enclosing_Master) = E_Package then
3336 if Is_Compilation_Unit (Enclosing_Master) then
3337 if In_Package_Body (Enclosing_Master) then
3339 (Body_Entity (Enclosing_Master));
3348 Enclosing_Master := Scope (Enclosing_Master);
3351 elsif Ekind (Enclosing_Master) = E_Generic_Package then
3352 Enclosing_Master := Scope (Enclosing_Master);
3354 elsif Is_Generic_Subprogram (Enclosing_Master)
3355 or else Ekind (Enclosing_Master) = E_Void
3357 -- Cleanup actions will eventually be performed on the
3358 -- enclosing instance, if any. Enclosing scope is void
3359 -- in the formal part of a generic subprogram.
3364 if Ekind (Enclosing_Master) = E_Entry
3366 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3368 if not Expander_Active then
3372 Protected_Body_Subprogram (Enclosing_Master);
3376 Set_Delay_Cleanups (Enclosing_Master);
3378 while Ekind (Enclosing_Master) = E_Block loop
3379 Enclosing_Master := Scope (Enclosing_Master);
3382 if Is_Subprogram (Enclosing_Master) then
3383 Delay_Descriptors (Enclosing_Master);
3385 elsif Is_Task_Type (Enclosing_Master) then
3387 TBP : constant Node_Id :=
3388 Get_Task_Body_Procedure
3391 if Present (TBP) then
3392 Delay_Descriptors (TBP);
3393 Set_Delay_Cleanups (TBP);
3400 end loop Scope_Loop;
3403 -- Make entry in table
3405 Pending_Instantiations.Append
3407 Act_Decl => Act_Decl,
3408 Expander_Status => Expander_Active,
3409 Current_Sem_Unit => Current_Sem_Unit,
3410 Scope_Suppress => Scope_Suppress,
3411 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3412 Version => Ada_Version));
3416 Set_Categorization_From_Pragmas (Act_Decl);
3418 if Parent_Installed then
3422 Set_Instance_Spec (N, Act_Decl);
3424 -- If not a compilation unit, insert the package declaration before
3425 -- the original instantiation node.
3427 if Nkind (Parent (N)) /= N_Compilation_Unit then
3428 Mark_Rewrite_Insertion (Act_Decl);
3429 Insert_Before (N, Act_Decl);
3432 -- For an instantiation that is a compilation unit, place declaration
3433 -- on current node so context is complete for analysis (including
3434 -- nested instantiations). If this is the main unit, the declaration
3435 -- eventually replaces the instantiation node. If the instance body
3436 -- is created later, it replaces the instance node, and the
3437 -- declaration is attached to it (see
3438 -- Build_Instance_Compilation_Unit_Nodes).
3441 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3443 -- The entity for the current unit is the newly created one,
3444 -- and all semantic information is attached to it.
3446 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3448 -- If this is the main unit, replace the main entity as well
3450 if Current_Sem_Unit = Main_Unit then
3451 Main_Unit_Entity := Act_Decl_Id;
3455 Set_Unit (Parent (N), Act_Decl);
3456 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3457 Set_Package_Instantiation (Act_Decl_Id, N);
3459 Set_Unit (Parent (N), N);
3460 Set_Body_Required (Parent (N), False);
3462 -- We never need elaboration checks on instantiations, since by
3463 -- definition, the body instantiation is elaborated at the same
3464 -- time as the spec instantiation.
3466 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3467 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3470 Check_Elab_Instantiation (N);
3472 if ABE_Is_Certain (N) and then Needs_Body then
3473 Pending_Instantiations.Decrement_Last;
3476 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3478 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3479 First_Private_Entity (Act_Decl_Id));
3481 -- If the instantiation will receive a body, the unit will be
3482 -- transformed into a package body, and receive its own elaboration
3483 -- entity. Otherwise, the nature of the unit is now a package
3486 if Nkind (Parent (N)) = N_Compilation_Unit
3487 and then not Needs_Body
3489 Rewrite (N, Act_Decl);
3492 if Present (Corresponding_Body (Gen_Decl))
3493 or else Unit_Requires_Body (Gen_Unit)
3495 Set_Has_Completion (Act_Decl_Id);
3498 Check_Formal_Packages (Act_Decl_Id);
3500 Restore_Private_Views (Act_Decl_Id);
3502 Inherit_Context (Gen_Decl, N);
3504 if Parent_Installed then
3509 Env_Installed := False;
3512 Validate_Categorization_Dependency (N, Act_Decl_Id);
3514 -- There used to be a check here to prevent instantiations in local
3515 -- contexts if the No_Local_Allocators restriction was active. This
3516 -- check was removed by a binding interpretation in AI-95-00130/07,
3517 -- but we retain the code for documentation purposes.
3519 -- if Ekind (Act_Decl_Id) /= E_Void
3520 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3522 -- Check_Restriction (No_Local_Allocators, N);
3526 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3529 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3530 -- be used as defining identifiers for a formal package and for the
3531 -- corresponding expanded package.
3533 if Nkind (N) = N_Formal_Package_Declaration then
3534 Act_Decl_Id := New_Copy (Defining_Entity (N));
3535 Set_Comes_From_Source (Act_Decl_Id, True);
3536 Set_Is_Generic_Instance (Act_Decl_Id, False);
3537 Set_Defining_Identifier (N, Act_Decl_Id);
3541 when Instantiation_Error =>
3542 if Parent_Installed then
3546 if Env_Installed then
3549 end Analyze_Package_Instantiation;
3551 --------------------------
3552 -- Inline_Instance_Body --
3553 --------------------------
3555 procedure Inline_Instance_Body
3557 Gen_Unit : Entity_Id;
3561 Gen_Comp : constant Entity_Id :=
3562 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3563 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3564 Curr_Scope : Entity_Id := Empty;
3565 Curr_Unit : constant Entity_Id :=
3566 Cunit_Entity (Current_Sem_Unit);
3567 Removed : Boolean := False;
3568 Num_Scopes : Int := 0;
3570 Scope_Stack_Depth : constant Int :=
3571 Scope_Stack.Last - Scope_Stack.First + 1;
3573 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3574 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3575 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3576 Num_Inner : Int := 0;
3577 N_Instances : Int := 0;
3581 -- Case of generic unit defined in another unit. We must remove the
3582 -- complete context of the current unit to install that of the generic.
3584 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3586 -- Add some comments for the following two loops ???
3589 while Present (S) and then S /= Standard_Standard loop
3591 Num_Scopes := Num_Scopes + 1;
3593 Use_Clauses (Num_Scopes) :=
3595 (Scope_Stack.Last - Num_Scopes + 1).
3597 End_Use_Clauses (Use_Clauses (Num_Scopes));
3599 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3600 or else Scope_Stack.Table
3601 (Scope_Stack.Last - Num_Scopes).Entity
3605 exit when Is_Generic_Instance (S)
3606 and then (In_Package_Body (S)
3607 or else Ekind (S) = E_Procedure
3608 or else Ekind (S) = E_Function);
3612 Vis := Is_Immediately_Visible (Gen_Comp);
3614 -- Find and save all enclosing instances
3619 and then S /= Standard_Standard
3621 if Is_Generic_Instance (S) then
3622 N_Instances := N_Instances + 1;
3623 Instances (N_Instances) := S;
3625 exit when In_Package_Body (S);
3631 -- Remove context of current compilation unit, unless we are within a
3632 -- nested package instantiation, in which case the context has been
3633 -- removed previously.
3635 -- If current scope is the body of a child unit, remove context of
3636 -- spec as well. If an enclosing scope is an instance body, the
3637 -- context has already been removed, but the entities in the body
3638 -- must be made invisible as well.
3643 and then S /= Standard_Standard
3645 if Is_Generic_Instance (S)
3646 and then (In_Package_Body (S)
3647 or else Ekind (S) = E_Procedure
3648 or else Ekind (S) = E_Function)
3650 -- We still have to remove the entities of the enclosing
3651 -- instance from direct visibility.
3656 E := First_Entity (S);
3657 while Present (E) loop
3658 Set_Is_Immediately_Visible (E, False);
3667 or else (Ekind (Curr_Unit) = E_Package_Body
3668 and then S = Spec_Entity (Curr_Unit))
3669 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3672 (Unit_Declaration_Node (Curr_Unit)))
3676 -- Remove entities in current scopes from visibility, so that
3677 -- instance body is compiled in a clean environment.
3679 Save_Scope_Stack (Handle_Use => False);
3681 if Is_Child_Unit (S) then
3683 -- Remove child unit from stack, as well as inner scopes.
3684 -- Removing the context of a child unit removes parent units
3687 while Current_Scope /= S loop
3688 Num_Inner := Num_Inner + 1;
3689 Inner_Scopes (Num_Inner) := Current_Scope;
3694 Remove_Context (Curr_Comp);
3698 Remove_Context (Curr_Comp);
3701 if Ekind (Curr_Unit) = E_Package_Body then
3702 Remove_Context (Library_Unit (Curr_Comp));
3708 pragma Assert (Num_Inner < Num_Scopes);
3710 Push_Scope (Standard_Standard);
3711 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3712 Instantiate_Package_Body
3715 Act_Decl => Act_Decl,
3716 Expander_Status => Expander_Active,
3717 Current_Sem_Unit => Current_Sem_Unit,
3718 Scope_Suppress => Scope_Suppress,
3719 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3720 Version => Ada_Version)),
3721 Inlined_Body => True);
3727 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3729 -- Reset Generic_Instance flag so that use clauses can be installed
3730 -- in the proper order. (See Use_One_Package for effect of enclosing
3731 -- instances on processing of use clauses).
3733 for J in 1 .. N_Instances loop
3734 Set_Is_Generic_Instance (Instances (J), False);
3738 Install_Context (Curr_Comp);
3740 if Present (Curr_Scope)
3741 and then Is_Child_Unit (Curr_Scope)
3743 Push_Scope (Curr_Scope);
3744 Set_Is_Immediately_Visible (Curr_Scope);
3746 -- Finally, restore inner scopes as well
3748 for J in reverse 1 .. Num_Inner loop
3749 Push_Scope (Inner_Scopes (J));
3753 Restore_Scope_Stack (Handle_Use => False);
3755 if Present (Curr_Scope)
3757 (In_Private_Part (Curr_Scope)
3758 or else In_Package_Body (Curr_Scope))
3760 -- Install private declaration of ancestor units, which are
3761 -- currently available. Restore_Scope_Stack and Install_Context
3762 -- only install the visible part of parents.
3767 Par := Scope (Curr_Scope);
3768 while (Present (Par))
3769 and then Par /= Standard_Standard
3771 Install_Private_Declarations (Par);
3778 -- Restore use clauses. For a child unit, use clauses in the parents
3779 -- are restored when installing the context, so only those in inner
3780 -- scopes (and those local to the child unit itself) need to be
3781 -- installed explicitly.
3783 if Is_Child_Unit (Curr_Unit)
3786 for J in reverse 1 .. Num_Inner + 1 loop
3787 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3789 Install_Use_Clauses (Use_Clauses (J));
3793 for J in reverse 1 .. Num_Scopes loop
3794 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3796 Install_Use_Clauses (Use_Clauses (J));
3800 -- Restore status of instances. If one of them is a body, make
3801 -- its local entities visible again.
3808 for J in 1 .. N_Instances loop
3809 Inst := Instances (J);
3810 Set_Is_Generic_Instance (Inst, True);
3812 if In_Package_Body (Inst)
3813 or else Ekind (S) = E_Procedure
3814 or else Ekind (S) = E_Function
3816 E := First_Entity (Instances (J));
3817 while Present (E) loop
3818 Set_Is_Immediately_Visible (E);
3825 -- If generic unit is in current unit, current context is correct
3828 Instantiate_Package_Body
3831 Act_Decl => Act_Decl,
3832 Expander_Status => Expander_Active,
3833 Current_Sem_Unit => Current_Sem_Unit,
3834 Scope_Suppress => Scope_Suppress,
3835 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3836 Version => Ada_Version)),
3837 Inlined_Body => True);
3839 end Inline_Instance_Body;
3841 -------------------------------------
3842 -- Analyze_Procedure_Instantiation --
3843 -------------------------------------
3845 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3847 Analyze_Subprogram_Instantiation (N, E_Procedure);
3848 end Analyze_Procedure_Instantiation;
3850 -----------------------------------
3851 -- Need_Subprogram_Instance_Body --
3852 -----------------------------------
3854 function Need_Subprogram_Instance_Body
3856 Subp : Entity_Id) return Boolean
3859 if (Is_In_Main_Unit (N)
3860 or else Is_Inlined (Subp)
3861 or else Is_Inlined (Alias (Subp)))
3862 and then (Operating_Mode = Generate_Code
3863 or else (Operating_Mode = Check_Semantics
3864 and then ASIS_Mode))
3865 and then (Expander_Active or else ASIS_Mode)
3866 and then not ABE_Is_Certain (N)
3867 and then not Is_Eliminated (Subp)
3869 Pending_Instantiations.Append
3871 Act_Decl => Unit_Declaration_Node (Subp),
3872 Expander_Status => Expander_Active,
3873 Current_Sem_Unit => Current_Sem_Unit,
3874 Scope_Suppress => Scope_Suppress,
3875 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
3876 Version => Ada_Version));
3881 end Need_Subprogram_Instance_Body;
3883 --------------------------------------
3884 -- Analyze_Subprogram_Instantiation --
3885 --------------------------------------
3887 procedure Analyze_Subprogram_Instantiation
3891 Loc : constant Source_Ptr := Sloc (N);
3892 Gen_Id : constant Node_Id := Name (N);
3894 Anon_Id : constant Entity_Id :=
3895 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3896 Chars => New_External_Name
3897 (Chars (Defining_Entity (N)), 'R'));
3899 Act_Decl_Id : Entity_Id;
3904 Env_Installed : Boolean := False;
3905 Gen_Unit : Entity_Id;
3907 Pack_Id : Entity_Id;
3908 Parent_Installed : Boolean := False;
3909 Renaming_List : List_Id;
3911 procedure Analyze_Instance_And_Renamings;
3912 -- The instance must be analyzed in a context that includes the mappings
3913 -- of generic parameters into actuals. We create a package declaration
3914 -- for this purpose, and a subprogram with an internal name within the
3915 -- package. The subprogram instance is simply an alias for the internal
3916 -- subprogram, declared in the current scope.
3918 ------------------------------------
3919 -- Analyze_Instance_And_Renamings --
3920 ------------------------------------
3922 procedure Analyze_Instance_And_Renamings is
3923 Def_Ent : constant Entity_Id := Defining_Entity (N);
3924 Pack_Decl : Node_Id;
3927 if Nkind (Parent (N)) = N_Compilation_Unit then
3929 -- For the case of a compilation unit, the container package has
3930 -- the same name as the instantiation, to insure that the binder
3931 -- calls the elaboration procedure with the right name. Copy the
3932 -- entity of the instance, which may have compilation level flags
3933 -- (e.g. Is_Child_Unit) set.
3935 Pack_Id := New_Copy (Def_Ent);
3938 -- Otherwise we use the name of the instantiation concatenated
3939 -- with its source position to ensure uniqueness if there are
3940 -- several instantiations with the same name.
3943 Make_Defining_Identifier (Loc,
3944 Chars => New_External_Name
3945 (Related_Id => Chars (Def_Ent),
3947 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3950 Pack_Decl := Make_Package_Declaration (Loc,
3951 Specification => Make_Package_Specification (Loc,
3952 Defining_Unit_Name => Pack_Id,
3953 Visible_Declarations => Renaming_List,
3954 End_Label => Empty));
3956 Set_Instance_Spec (N, Pack_Decl);
3957 Set_Is_Generic_Instance (Pack_Id);
3958 Set_Debug_Info_Needed (Pack_Id);
3960 -- Case of not a compilation unit
3962 if Nkind (Parent (N)) /= N_Compilation_Unit then
3963 Mark_Rewrite_Insertion (Pack_Decl);
3964 Insert_Before (N, Pack_Decl);
3965 Set_Has_Completion (Pack_Id);
3967 -- Case of an instantiation that is a compilation unit
3969 -- Place declaration on current node so context is complete for
3970 -- analysis (including nested instantiations), and for use in a
3971 -- context_clause (see Analyze_With_Clause).
3974 Set_Unit (Parent (N), Pack_Decl);
3975 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3978 Analyze (Pack_Decl);
3979 Check_Formal_Packages (Pack_Id);
3980 Set_Is_Generic_Instance (Pack_Id, False);
3982 -- Body of the enclosing package is supplied when instantiating the
3983 -- subprogram body, after semantic analysis is completed.
3985 if Nkind (Parent (N)) = N_Compilation_Unit then
3987 -- Remove package itself from visibility, so it does not
3988 -- conflict with subprogram.
3990 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3992 -- Set name and scope of internal subprogram so that the proper
3993 -- external name will be generated. The proper scope is the scope
3994 -- of the wrapper package. We need to generate debugging info for
3995 -- the internal subprogram, so set flag accordingly.
3997 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3998 Set_Scope (Anon_Id, Scope (Pack_Id));
4000 -- Mark wrapper package as referenced, to avoid spurious warnings
4001 -- if the instantiation appears in various with_ clauses of
4002 -- subunits of the main unit.
4004 Set_Referenced (Pack_Id);
4007 Set_Is_Generic_Instance (Anon_Id);
4008 Set_Debug_Info_Needed (Anon_Id);
4009 Act_Decl_Id := New_Copy (Anon_Id);
4011 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4012 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4013 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4014 Set_Comes_From_Source (Act_Decl_Id, True);
4016 -- The signature may involve types that are not frozen yet, but the
4017 -- subprogram will be frozen at the point the wrapper package is
4018 -- frozen, so it does not need its own freeze node. In fact, if one
4019 -- is created, it might conflict with the freezing actions from the
4022 Set_Has_Delayed_Freeze (Anon_Id, False);
4024 -- If the instance is a child unit, mark the Id accordingly. Mark
4025 -- the anonymous entity as well, which is the real subprogram and
4026 -- which is used when the instance appears in a context clause.
4027 -- Similarly, propagate the Is_Eliminated flag to handle properly
4028 -- nested eliminated subprograms.
4030 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4031 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4032 New_Overloaded_Entity (Act_Decl_Id);
4033 Check_Eliminated (Act_Decl_Id);
4034 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4036 -- In compilation unit case, kill elaboration checks on the
4037 -- instantiation, since they are never needed -- the body is
4038 -- instantiated at the same point as the spec.
4040 if Nkind (Parent (N)) = N_Compilation_Unit then
4041 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4042 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4043 Set_Is_Compilation_Unit (Anon_Id);
4045 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4048 -- The instance is not a freezing point for the new subprogram
4050 Set_Is_Frozen (Act_Decl_Id, False);
4052 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4053 Valid_Operator_Definition (Act_Decl_Id);
4056 Set_Alias (Act_Decl_Id, Anon_Id);
4057 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4058 Set_Has_Completion (Act_Decl_Id);
4059 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4061 if Nkind (Parent (N)) = N_Compilation_Unit then
4062 Set_Body_Required (Parent (N), False);
4064 end Analyze_Instance_And_Renamings;
4066 -- Start of processing for Analyze_Subprogram_Instantiation
4069 -- Very first thing: apply the special kludge for Text_IO processing
4070 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4071 -- Of course such an instantiation is bogus (these are packages, not
4072 -- subprograms), but we get a better error message if we do this.
4074 Text_IO_Kludge (Gen_Id);
4076 -- Make node global for error reporting
4078 Instantiation_Node := N;
4079 Preanalyze_Actuals (N);
4082 Env_Installed := True;
4083 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
4084 Gen_Unit := Entity (Gen_Id);
4086 Generate_Reference (Gen_Unit, Gen_Id);
4088 if Nkind (Gen_Id) = N_Identifier
4089 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
4092 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
4095 if Etype (Gen_Unit) = Any_Type then
4100 -- Verify that it is a generic subprogram of the right kind, and that
4101 -- it does not lead to a circular instantiation.
4103 if not Ekind_In (Gen_Unit, E_Generic_Procedure, E_Generic_Function) then
4104 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
4106 elsif In_Open_Scopes (Gen_Unit) then
4107 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
4109 elsif K = E_Procedure
4110 and then Ekind (Gen_Unit) /= E_Generic_Procedure
4112 if Ekind (Gen_Unit) = E_Generic_Function then
4114 ("cannot instantiate generic function as procedure", Gen_Id);
4117 ("expect name of generic procedure in instantiation", Gen_Id);
4120 elsif K = E_Function
4121 and then Ekind (Gen_Unit) /= E_Generic_Function
4123 if Ekind (Gen_Unit) = E_Generic_Procedure then
4125 ("cannot instantiate generic procedure as function", Gen_Id);
4128 ("expect name of generic function in instantiation", Gen_Id);
4132 Set_Entity (Gen_Id, Gen_Unit);
4133 Set_Is_Instantiated (Gen_Unit);
4135 if In_Extended_Main_Source_Unit (N) then
4136 Generate_Reference (Gen_Unit, N);
4139 -- If renaming, get original unit
4141 if Present (Renamed_Object (Gen_Unit))
4142 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4144 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4146 Gen_Unit := Renamed_Object (Gen_Unit);
4147 Set_Is_Instantiated (Gen_Unit);
4148 Generate_Reference (Gen_Unit, N);
4151 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4152 Error_Msg_Node_2 := Current_Scope;
4154 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4155 Circularity_Detected := True;
4159 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4161 -- Initialize renamings map, for error checking
4163 Generic_Renamings.Set_Last (0);
4164 Generic_Renamings_HTable.Reset;
4166 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4168 -- Copy original generic tree, to produce text for instantiation
4172 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4174 -- Inherit overriding indicator from instance node
4176 Act_Spec := Specification (Act_Tree);
4177 Set_Must_Override (Act_Spec, Must_Override (N));
4178 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
4181 Analyze_Associations
4183 Generic_Formal_Declarations (Act_Tree),
4184 Generic_Formal_Declarations (Gen_Decl));
4186 -- The subprogram itself cannot contain a nested instance, so the
4187 -- current parent is left empty.
4189 Set_Instance_Env (Gen_Unit, Empty);
4191 -- Build the subprogram declaration, which does not appear in the
4192 -- generic template, and give it a sloc consistent with that of the
4195 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4196 Set_Generic_Parent (Act_Spec, Gen_Unit);
4198 Make_Subprogram_Declaration (Sloc (Act_Spec),
4199 Specification => Act_Spec);
4201 Set_Categorization_From_Pragmas (Act_Decl);
4203 if Parent_Installed then
4207 Append (Act_Decl, Renaming_List);
4208 Analyze_Instance_And_Renamings;
4210 -- If the generic is marked Import (Intrinsic), then so is the
4211 -- instance. This indicates that there is no body to instantiate. If
4212 -- generic is marked inline, so it the instance, and the anonymous
4213 -- subprogram it renames. If inlined, or else if inlining is enabled
4214 -- for the compilation, we generate the instance body even if it is
4215 -- not within the main unit.
4217 -- Any other pragmas might also be inherited ???
4219 if Is_Intrinsic_Subprogram (Gen_Unit) then
4220 Set_Is_Intrinsic_Subprogram (Anon_Id);
4221 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4223 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4224 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4228 Generate_Definition (Act_Decl_Id);
4230 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4231 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4233 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4234 Check_Elab_Instantiation (N);
4237 if Is_Dispatching_Operation (Act_Decl_Id)
4238 and then Ada_Version >= Ada_05
4244 Formal := First_Formal (Act_Decl_Id);
4245 while Present (Formal) loop
4246 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4247 and then Is_Controlling_Formal (Formal)
4248 and then not Can_Never_Be_Null (Formal)
4250 Error_Msg_NE ("access parameter& is controlling,",
4253 ("\corresponding parameter of & must be"
4254 & " explicitly null-excluding", N, Gen_Id);
4257 Next_Formal (Formal);
4262 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4264 -- Subject to change, pending on if other pragmas are inherited ???
4266 Validate_Categorization_Dependency (N, Act_Decl_Id);
4268 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4269 Inherit_Context (Gen_Decl, N);
4271 Restore_Private_Views (Pack_Id, False);
4273 -- If the context requires a full instantiation, mark node for
4274 -- subsequent construction of the body.
4276 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
4278 Check_Forward_Instantiation (Gen_Decl);
4280 -- The wrapper package is always delayed, because it does not
4281 -- constitute a freeze point, but to insure that the freeze
4282 -- node is placed properly, it is created directly when
4283 -- instantiating the body (otherwise the freeze node might
4284 -- appear to early for nested instantiations).
4286 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4288 -- For ASIS purposes, indicate that the wrapper package has
4289 -- replaced the instantiation node.
4291 Rewrite (N, Unit (Parent (N)));
4292 Set_Unit (Parent (N), N);
4295 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4297 -- Replace instance node for library-level instantiations of
4298 -- intrinsic subprograms, for ASIS use.
4300 Rewrite (N, Unit (Parent (N)));
4301 Set_Unit (Parent (N), N);
4304 if Parent_Installed then
4309 Env_Installed := False;
4310 Generic_Renamings.Set_Last (0);
4311 Generic_Renamings_HTable.Reset;
4315 when Instantiation_Error =>
4316 if Parent_Installed then
4320 if Env_Installed then
4323 end Analyze_Subprogram_Instantiation;
4325 -------------------------
4326 -- Get_Associated_Node --
4327 -------------------------
4329 function Get_Associated_Node (N : Node_Id) return Node_Id is
4333 Assoc := Associated_Node (N);
4335 if Nkind (Assoc) /= Nkind (N) then
4338 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
4342 -- If the node is part of an inner generic, it may itself have been
4343 -- remapped into a further generic copy. Associated_Node is otherwise
4344 -- used for the entity of the node, and will be of a different node
4345 -- kind, or else N has been rewritten as a literal or function call.
4347 while Present (Associated_Node (Assoc))
4348 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4350 Assoc := Associated_Node (Assoc);
4353 -- Follow and additional link in case the final node was rewritten.
4354 -- This can only happen with nested generic units.
4356 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4357 and then Present (Associated_Node (Assoc))
4358 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
4359 N_Explicit_Dereference,
4364 Assoc := Associated_Node (Assoc);
4369 end Get_Associated_Node;
4371 -------------------------------------------
4372 -- Build_Instance_Compilation_Unit_Nodes --
4373 -------------------------------------------
4375 procedure Build_Instance_Compilation_Unit_Nodes
4380 Decl_Cunit : Node_Id;
4381 Body_Cunit : Node_Id;
4383 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4384 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4387 -- A new compilation unit node is built for the instance declaration
4390 Make_Compilation_Unit (Sloc (N),
4391 Context_Items => Empty_List,
4394 Make_Compilation_Unit_Aux (Sloc (N)));
4396 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4398 -- The new compilation unit is linked to its body, but both share the
4399 -- same file, so we do not set Body_Required on the new unit so as not
4400 -- to create a spurious dependency on a non-existent body in the ali.
4401 -- This simplifies CodePeer unit traversal.
4403 -- We use the original instantiation compilation unit as the resulting
4404 -- compilation unit of the instance, since this is the main unit.
4406 Rewrite (N, Act_Body);
4407 Body_Cunit := Parent (N);
4409 -- The two compilation unit nodes are linked by the Library_Unit field
4411 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4412 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4414 -- Preserve the private nature of the package if needed
4416 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4418 -- If the instance is not the main unit, its context, categorization
4419 -- and elaboration entity are not relevant to the compilation.
4421 if Body_Cunit /= Cunit (Main_Unit) then
4422 Make_Instance_Unit (Body_Cunit, In_Main => False);
4426 -- The context clause items on the instantiation, which are now attached
4427 -- to the body compilation unit (since the body overwrote the original
4428 -- instantiation node), semantically belong on the spec, so copy them
4429 -- there. It's harmless to leave them on the body as well. In fact one
4430 -- could argue that they belong in both places.
4432 Citem := First (Context_Items (Body_Cunit));
4433 while Present (Citem) loop
4434 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4438 -- Propagate categorization flags on packages, so that they appear in
4439 -- the ali file for the spec of the unit.
4441 if Ekind (New_Main) = E_Package then
4442 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4443 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4444 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4445 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4446 Set_Is_Remote_Call_Interface
4447 (Old_Main, Is_Remote_Call_Interface (New_Main));
4450 -- Make entry in Units table, so that binder can generate call to
4451 -- elaboration procedure for body, if any.
4453 Make_Instance_Unit (Body_Cunit, In_Main => True);
4454 Main_Unit_Entity := New_Main;
4455 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4457 -- Build elaboration entity, since the instance may certainly generate
4458 -- elaboration code requiring a flag for protection.
4460 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4461 end Build_Instance_Compilation_Unit_Nodes;
4463 -----------------------------
4464 -- Check_Access_Definition --
4465 -----------------------------
4467 procedure Check_Access_Definition (N : Node_Id) is
4470 (Ada_Version >= Ada_05
4471 and then Present (Access_Definition (N)));
4473 end Check_Access_Definition;
4475 -----------------------------------
4476 -- Check_Formal_Package_Instance --
4477 -----------------------------------
4479 -- If the formal has specific parameters, they must match those of the
4480 -- actual. Both of them are instances, and the renaming declarations for
4481 -- their formal parameters appear in the same order in both. The analyzed
4482 -- formal has been analyzed in the context of the current instance.
4484 procedure Check_Formal_Package_Instance
4485 (Formal_Pack : Entity_Id;
4486 Actual_Pack : Entity_Id)
4488 E1 : Entity_Id := First_Entity (Actual_Pack);
4489 E2 : Entity_Id := First_Entity (Formal_Pack);
4494 procedure Check_Mismatch (B : Boolean);
4495 -- Common error routine for mismatch between the parameters of the
4496 -- actual instance and those of the formal package.
4498 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4499 -- The formal may come from a nested formal package, and the actual may
4500 -- have been constant-folded. To determine whether the two denote the
4501 -- same entity we may have to traverse several definitions to recover
4502 -- the ultimate entity that they refer to.
4504 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4505 -- Similarly, if the formal comes from a nested formal package, the
4506 -- actual may designate the formal through multiple renamings, which
4507 -- have to be followed to determine the original variable in question.
4509 --------------------
4510 -- Check_Mismatch --
4511 --------------------
4513 procedure Check_Mismatch (B : Boolean) is
4514 Kind : constant Node_Kind := Nkind (Parent (E2));
4517 if Kind = N_Formal_Type_Declaration then
4520 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
4521 N_Formal_Package_Declaration)
4522 or else Kind in N_Formal_Subprogram_Declaration
4528 ("actual for & in actual instance does not match formal",
4529 Parent (Actual_Pack), E1);
4533 --------------------------------
4534 -- Same_Instantiated_Constant --
4535 --------------------------------
4537 function Same_Instantiated_Constant
4538 (E1, E2 : Entity_Id) return Boolean
4544 while Present (Ent) loop
4548 elsif Ekind (Ent) /= E_Constant then
4551 elsif Is_Entity_Name (Constant_Value (Ent)) then
4552 if Entity (Constant_Value (Ent)) = E1 then
4555 Ent := Entity (Constant_Value (Ent));
4558 -- The actual may be a constant that has been folded. Recover
4561 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4562 Ent := Entity (Original_Node (Constant_Value (Ent)));
4569 end Same_Instantiated_Constant;
4571 --------------------------------
4572 -- Same_Instantiated_Variable --
4573 --------------------------------
4575 function Same_Instantiated_Variable
4576 (E1, E2 : Entity_Id) return Boolean
4578 function Original_Entity (E : Entity_Id) return Entity_Id;
4579 -- Follow chain of renamings to the ultimate ancestor
4581 ---------------------
4582 -- Original_Entity --
4583 ---------------------
4585 function Original_Entity (E : Entity_Id) return Entity_Id is
4590 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4591 and then Present (Renamed_Object (Orig))
4592 and then Is_Entity_Name (Renamed_Object (Orig))
4594 Orig := Entity (Renamed_Object (Orig));
4598 end Original_Entity;
4600 -- Start of processing for Same_Instantiated_Variable
4603 return Ekind (E1) = Ekind (E2)
4604 and then Original_Entity (E1) = Original_Entity (E2);
4605 end Same_Instantiated_Variable;
4607 -- Start of processing for Check_Formal_Package_Instance
4611 and then Present (E2)
4613 exit when Ekind (E1) = E_Package
4614 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4616 -- If the formal is the renaming of the formal package, this
4617 -- is the end of its formal part, which may occur before the
4618 -- end of the formal part in the actual in the presence of
4619 -- defaulted parameters in the formal package.
4621 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4622 and then Renamed_Entity (E2) = Scope (E2);
4624 -- The analysis of the actual may generate additional internal
4625 -- entities. If the formal is defaulted, there is no corresponding
4626 -- analysis and the internal entities must be skipped, until we
4627 -- find corresponding entities again.
4629 if Comes_From_Source (E2)
4630 and then not Comes_From_Source (E1)
4631 and then Chars (E1) /= Chars (E2)
4634 and then Chars (E1) /= Chars (E2)
4643 -- If the formal entity comes from a formal declaration, it was
4644 -- defaulted in the formal package, and no check is needed on it.
4646 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4649 elsif Is_Type (E1) then
4651 -- Subtypes must statically match. E1, E2 are the local entities
4652 -- that are subtypes of the actuals. Itypes generated for other
4653 -- parameters need not be checked, the check will be performed
4654 -- on the parameters themselves.
4656 -- If E2 is a formal type declaration, it is a defaulted parameter
4657 -- and needs no checking.
4659 if not Is_Itype (E1)
4660 and then not Is_Itype (E2)
4664 or else Etype (E1) /= Etype (E2)
4665 or else not Subtypes_Statically_Match (E1, E2));
4668 elsif Ekind (E1) = E_Constant then
4670 -- IN parameters must denote the same static value, or the same
4671 -- constant, or the literal null.
4673 Expr1 := Expression (Parent (E1));
4675 if Ekind (E2) /= E_Constant then
4676 Check_Mismatch (True);
4679 Expr2 := Expression (Parent (E2));
4682 if Is_Static_Expression (Expr1) then
4684 if not Is_Static_Expression (Expr2) then
4685 Check_Mismatch (True);
4687 elsif Is_Discrete_Type (Etype (E1)) then
4689 V1 : constant Uint := Expr_Value (Expr1);
4690 V2 : constant Uint := Expr_Value (Expr2);
4692 Check_Mismatch (V1 /= V2);
4695 elsif Is_Real_Type (Etype (E1)) then
4697 V1 : constant Ureal := Expr_Value_R (Expr1);
4698 V2 : constant Ureal := Expr_Value_R (Expr2);
4700 Check_Mismatch (V1 /= V2);
4703 elsif Is_String_Type (Etype (E1))
4704 and then Nkind (Expr1) = N_String_Literal
4706 if Nkind (Expr2) /= N_String_Literal then
4707 Check_Mismatch (True);
4710 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4714 elsif Is_Entity_Name (Expr1) then
4715 if Is_Entity_Name (Expr2) then
4716 if Entity (Expr1) = Entity (Expr2) then
4720 (not Same_Instantiated_Constant
4721 (Entity (Expr1), Entity (Expr2)));
4724 Check_Mismatch (True);
4727 elsif Is_Entity_Name (Original_Node (Expr1))
4728 and then Is_Entity_Name (Expr2)
4730 Same_Instantiated_Constant
4731 (Entity (Original_Node (Expr1)), Entity (Expr2))
4735 elsif Nkind (Expr1) = N_Null then
4736 Check_Mismatch (Nkind (Expr1) /= N_Null);
4739 Check_Mismatch (True);
4742 elsif Ekind (E1) = E_Variable then
4743 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4745 elsif Ekind (E1) = E_Package then
4747 (Ekind (E1) /= Ekind (E2)
4748 or else Renamed_Object (E1) /= Renamed_Object (E2));
4750 elsif Is_Overloadable (E1) then
4752 -- Verify that the actual subprograms match. Note that actuals
4753 -- that are attributes are rewritten as subprograms. If the
4754 -- subprogram in the formal package is defaulted, no check is
4755 -- needed. Note that this can only happen in Ada 2005 when the
4756 -- formal package can be partially parameterized.
4758 if Nkind (Unit_Declaration_Node (E1)) =
4759 N_Subprogram_Renaming_Declaration
4760 and then From_Default (Unit_Declaration_Node (E1))
4766 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
4770 raise Program_Error;
4777 end Check_Formal_Package_Instance;
4779 ---------------------------
4780 -- Check_Formal_Packages --
4781 ---------------------------
4783 procedure Check_Formal_Packages (P_Id : Entity_Id) is
4785 Formal_P : Entity_Id;
4788 -- Iterate through the declarations in the instance, looking for package
4789 -- renaming declarations that denote instances of formal packages. Stop
4790 -- when we find the renaming of the current package itself. The
4791 -- declaration for a formal package without a box is followed by an
4792 -- internal entity that repeats the instantiation.
4794 E := First_Entity (P_Id);
4795 while Present (E) loop
4796 if Ekind (E) = E_Package then
4797 if Renamed_Object (E) = P_Id then
4800 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4803 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
4804 Formal_P := Next_Entity (E);
4805 Check_Formal_Package_Instance (Formal_P, E);
4807 -- After checking, remove the internal validating package. It
4808 -- is only needed for semantic checks, and as it may contain
4809 -- generic formal declarations it should not reach gigi.
4811 Remove (Unit_Declaration_Node (Formal_P));
4817 end Check_Formal_Packages;
4819 ---------------------------------
4820 -- Check_Forward_Instantiation --
4821 ---------------------------------
4823 procedure Check_Forward_Instantiation (Decl : Node_Id) is
4825 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
4828 -- The instantiation appears before the generic body if we are in the
4829 -- scope of the unit containing the generic, either in its spec or in
4830 -- the package body, and before the generic body.
4832 if Ekind (Gen_Comp) = E_Package_Body then
4833 Gen_Comp := Spec_Entity (Gen_Comp);
4836 if In_Open_Scopes (Gen_Comp)
4837 and then No (Corresponding_Body (Decl))
4842 and then not Is_Compilation_Unit (S)
4843 and then not Is_Child_Unit (S)
4845 if Ekind (S) = E_Package then
4846 Set_Has_Forward_Instantiation (S);
4852 end Check_Forward_Instantiation;
4854 ---------------------------
4855 -- Check_Generic_Actuals --
4856 ---------------------------
4858 -- The visibility of the actuals may be different between the point of
4859 -- generic instantiation and the instantiation of the body.
4861 procedure Check_Generic_Actuals
4862 (Instance : Entity_Id;
4863 Is_Formal_Box : Boolean)
4868 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
4869 -- For a formal that is an array type, the component type is often a
4870 -- previous formal in the same unit. The privacy status of the component
4871 -- type will have been examined earlier in the traversal of the
4872 -- corresponding actuals, and this status should not be modified for the
4873 -- array type itself.
4875 -- To detect this case we have to rescan the list of formals, which
4876 -- is usually short enough to ignore the resulting inefficiency.
4878 -----------------------------
4879 -- Denotes_Previous_Actual --
4880 -----------------------------
4882 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
4886 Prev := First_Entity (Instance);
4887 while Present (Prev) loop
4889 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
4890 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
4891 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
4904 end Denotes_Previous_Actual;
4906 -- Start of processing for Check_Generic_Actuals
4909 E := First_Entity (Instance);
4910 while Present (E) loop
4912 and then Nkind (Parent (E)) = N_Subtype_Declaration
4913 and then Scope (Etype (E)) /= Instance
4914 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
4916 if Is_Array_Type (E)
4917 and then Denotes_Previous_Actual (Component_Type (E))
4921 Check_Private_View (Subtype_Indication (Parent (E)));
4923 Set_Is_Generic_Actual_Type (E, True);
4924 Set_Is_Hidden (E, False);
4925 Set_Is_Potentially_Use_Visible (E,
4928 -- We constructed the generic actual type as a subtype of the
4929 -- supplied type. This means that it normally would not inherit
4930 -- subtype specific attributes of the actual, which is wrong for
4931 -- the generic case.
4933 Astype := Ancestor_Subtype (E);
4937 -- This can happen when E is an itype that is the full view of
4938 -- a private type completed, e.g. with a constrained array. In
4939 -- that case, use the first subtype, which will carry size
4940 -- information. The base type itself is unconstrained and will
4943 Astype := First_Subtype (E);
4946 Set_Size_Info (E, (Astype));
4947 Set_RM_Size (E, RM_Size (Astype));
4948 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4950 if Is_Discrete_Or_Fixed_Point_Type (E) then
4951 Set_RM_Size (E, RM_Size (Astype));
4953 -- In nested instances, the base type of an access actual
4954 -- may itself be private, and need to be exchanged.
4956 elsif Is_Access_Type (E)
4957 and then Is_Private_Type (Etype (E))
4960 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4963 elsif Ekind (E) = E_Package then
4965 -- If this is the renaming for the current instance, we're done.
4966 -- Otherwise it is a formal package. If the corresponding formal
4967 -- was declared with a box, the (instantiations of the) generic
4968 -- formal part are also visible. Otherwise, ignore the entity
4969 -- created to validate the actuals.
4971 if Renamed_Object (E) = Instance then
4974 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4977 -- The visibility of a formal of an enclosing generic is already
4980 elsif Denotes_Formal_Package (E) then
4983 elsif Present (Associated_Formal_Package (E))
4984 and then not Is_Generic_Formal (E)
4986 if Box_Present (Parent (Associated_Formal_Package (E))) then
4987 Check_Generic_Actuals (Renamed_Object (E), True);
4990 Check_Generic_Actuals (Renamed_Object (E), False);
4993 Set_Is_Hidden (E, False);
4996 -- If this is a subprogram instance (in a wrapper package) the
4997 -- actual is fully visible.
4999 elsif Is_Wrapper_Package (Instance) then
5000 Set_Is_Hidden (E, False);
5002 -- If the formal package is declared with a box, or if the formal
5003 -- parameter is defaulted, it is visible in the body.
5006 or else Is_Visible_Formal (E)
5008 Set_Is_Hidden (E, False);
5013 end Check_Generic_Actuals;
5015 ------------------------------
5016 -- Check_Generic_Child_Unit --
5017 ------------------------------
5019 procedure Check_Generic_Child_Unit
5021 Parent_Installed : in out Boolean)
5023 Loc : constant Source_Ptr := Sloc (Gen_Id);
5024 Gen_Par : Entity_Id := Empty;
5026 Inst_Par : Entity_Id;
5029 function Find_Generic_Child
5031 Id : Node_Id) return Entity_Id;
5032 -- Search generic parent for possible child unit with the given name
5034 function In_Enclosing_Instance return Boolean;
5035 -- Within an instance of the parent, the child unit may be denoted
5036 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5037 -- scopes to locate a possible parent instantiation.
5039 ------------------------
5040 -- Find_Generic_Child --
5041 ------------------------
5043 function Find_Generic_Child
5045 Id : Node_Id) return Entity_Id
5050 -- If entity of name is already set, instance has already been
5051 -- resolved, e.g. in an enclosing instantiation.
5053 if Present (Entity (Id)) then
5054 if Scope (Entity (Id)) = Scop then
5061 E := First_Entity (Scop);
5062 while Present (E) loop
5063 if Chars (E) = Chars (Id)
5064 and then Is_Child_Unit (E)
5066 if Is_Child_Unit (E)
5067 and then not Is_Visible_Child_Unit (E)
5070 ("generic child unit& is not visible", Gen_Id, E);
5082 end Find_Generic_Child;
5084 ---------------------------
5085 -- In_Enclosing_Instance --
5086 ---------------------------
5088 function In_Enclosing_Instance return Boolean is
5089 Enclosing_Instance : Node_Id;
5090 Instance_Decl : Node_Id;
5093 -- We do not inline any call that contains instantiations, except
5094 -- for instantiations of Unchecked_Conversion, so if we are within
5095 -- an inlined body the current instance does not require parents.
5097 if In_Inlined_Body then
5098 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
5102 -- Loop to check enclosing scopes
5104 Enclosing_Instance := Current_Scope;
5105 while Present (Enclosing_Instance) loop
5106 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
5108 if Ekind (Enclosing_Instance) = E_Package
5109 and then Is_Generic_Instance (Enclosing_Instance)
5111 (Generic_Parent (Specification (Instance_Decl)))
5113 -- Check whether the generic we are looking for is a child of
5116 E := Find_Generic_Child
5117 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
5118 exit when Present (E);
5124 Enclosing_Instance := Scope (Enclosing_Instance);
5136 Make_Expanded_Name (Loc,
5138 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
5139 Selector_Name => New_Occurrence_Of (E, Loc)));
5141 Set_Entity (Gen_Id, E);
5142 Set_Etype (Gen_Id, Etype (E));
5143 Parent_Installed := False; -- Already in scope.
5146 end In_Enclosing_Instance;
5148 -- Start of processing for Check_Generic_Child_Unit
5151 -- If the name of the generic is given by a selected component, it may
5152 -- be the name of a generic child unit, and the prefix is the name of an
5153 -- instance of the parent, in which case the child unit must be visible.
5154 -- If this instance is not in scope, it must be placed there and removed
5155 -- after instantiation, because what is being instantiated is not the
5156 -- original child, but the corresponding child present in the instance
5159 -- If the child is instantiated within the parent, it can be given by
5160 -- a simple name. In this case the instance is already in scope, but
5161 -- the child generic must be recovered from the generic parent as well.
5163 if Nkind (Gen_Id) = N_Selected_Component then
5164 S := Selector_Name (Gen_Id);
5165 Analyze (Prefix (Gen_Id));
5166 Inst_Par := Entity (Prefix (Gen_Id));
5168 if Ekind (Inst_Par) = E_Package
5169 and then Present (Renamed_Object (Inst_Par))
5171 Inst_Par := Renamed_Object (Inst_Par);
5174 if Ekind (Inst_Par) = E_Package then
5175 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5176 Gen_Par := Generic_Parent (Parent (Inst_Par));
5178 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5180 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5182 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5185 elsif Ekind (Inst_Par) = E_Generic_Package
5186 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5188 -- A formal package may be a real child package, and not the
5189 -- implicit instance within a parent. In this case the child is
5190 -- not visible and has to be retrieved explicitly as well.
5192 Gen_Par := Inst_Par;
5195 if Present (Gen_Par) then
5197 -- The prefix denotes an instantiation. The entity itself may be a
5198 -- nested generic, or a child unit.
5200 E := Find_Generic_Child (Gen_Par, S);
5203 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5204 Set_Entity (Gen_Id, E);
5205 Set_Etype (Gen_Id, Etype (E));
5207 Set_Etype (S, Etype (E));
5209 -- Indicate that this is a reference to the parent
5211 if In_Extended_Main_Source_Unit (Gen_Id) then
5212 Set_Is_Instantiated (Inst_Par);
5215 -- A common mistake is to replicate the naming scheme of a
5216 -- hierarchy by instantiating a generic child directly, rather
5217 -- than the implicit child in a parent instance:
5219 -- generic .. package Gpar is ..
5220 -- generic .. package Gpar.Child is ..
5221 -- package Par is new Gpar ();
5224 -- package Par.Child is new Gpar.Child ();
5225 -- rather than Par.Child
5227 -- In this case the instantiation is within Par, which is an
5228 -- instance, but Gpar does not denote Par because we are not IN
5229 -- the instance of Gpar, so this is illegal. The test below
5230 -- recognizes this particular case.
5232 if Is_Child_Unit (E)
5233 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5234 and then (not In_Instance
5235 or else Nkind (Parent (Parent (Gen_Id))) =
5239 ("prefix of generic child unit must be instance of parent",
5243 if not In_Open_Scopes (Inst_Par)
5244 and then Nkind (Parent (Gen_Id)) not in
5245 N_Generic_Renaming_Declaration
5247 Install_Parent (Inst_Par);
5248 Parent_Installed := True;
5250 elsif In_Open_Scopes (Inst_Par) then
5252 -- If the parent is already installed, install the actuals
5253 -- for its formal packages. This is necessary when the
5254 -- child instance is a child of the parent instance:
5255 -- in this case, the parent is placed on the scope stack
5256 -- but the formal packages are not made visible.
5258 Install_Formal_Packages (Inst_Par);
5262 -- If the generic parent does not contain an entity that
5263 -- corresponds to the selector, the instance doesn't either.
5264 -- Analyzing the node will yield the appropriate error message.
5265 -- If the entity is not a child unit, then it is an inner
5266 -- generic in the parent.
5274 if Is_Child_Unit (Entity (Gen_Id))
5276 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5277 and then not In_Open_Scopes (Inst_Par)
5279 Install_Parent (Inst_Par);
5280 Parent_Installed := True;
5284 elsif Nkind (Gen_Id) = N_Expanded_Name then
5286 -- Entity already present, analyze prefix, whose meaning may be
5287 -- an instance in the current context. If it is an instance of
5288 -- a relative within another, the proper parent may still have
5289 -- to be installed, if they are not of the same generation.
5291 Analyze (Prefix (Gen_Id));
5293 -- In the unlikely case that a local declaration hides the name
5294 -- of the parent package, locate it on the homonym chain. If the
5295 -- context is an instance of the parent, the renaming entity is
5298 Inst_Par := Entity (Prefix (Gen_Id));
5299 while Present (Inst_Par)
5300 and then not Is_Package_Or_Generic_Package (Inst_Par)
5302 Inst_Par := Homonym (Inst_Par);
5305 pragma Assert (Present (Inst_Par));
5306 Set_Entity (Prefix (Gen_Id), Inst_Par);
5308 if In_Enclosing_Instance then
5311 elsif Present (Entity (Gen_Id))
5312 and then Is_Child_Unit (Entity (Gen_Id))
5313 and then not In_Open_Scopes (Inst_Par)
5315 Install_Parent (Inst_Par);
5316 Parent_Installed := True;
5319 elsif In_Enclosing_Instance then
5321 -- The child unit is found in some enclosing scope
5328 -- If this is the renaming of the implicit child in a parent
5329 -- instance, recover the parent name and install it.
5331 if Is_Entity_Name (Gen_Id) then
5332 E := Entity (Gen_Id);
5334 if Is_Generic_Unit (E)
5335 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5336 and then Is_Child_Unit (Renamed_Object (E))
5337 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5338 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5341 New_Copy_Tree (Name (Parent (E))));
5342 Inst_Par := Entity (Prefix (Gen_Id));
5344 if not In_Open_Scopes (Inst_Par) then
5345 Install_Parent (Inst_Par);
5346 Parent_Installed := True;
5349 -- If it is a child unit of a non-generic parent, it may be
5350 -- use-visible and given by a direct name. Install parent as
5353 elsif Is_Generic_Unit (E)
5354 and then Is_Child_Unit (E)
5356 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5357 and then not Is_Generic_Unit (Scope (E))
5359 if not In_Open_Scopes (Scope (E)) then
5360 Install_Parent (Scope (E));
5361 Parent_Installed := True;
5366 end Check_Generic_Child_Unit;
5368 -----------------------------
5369 -- Check_Hidden_Child_Unit --
5370 -----------------------------
5372 procedure Check_Hidden_Child_Unit
5374 Gen_Unit : Entity_Id;
5375 Act_Decl_Id : Entity_Id)
5377 Gen_Id : constant Node_Id := Name (N);
5380 if Is_Child_Unit (Gen_Unit)
5381 and then Is_Child_Unit (Act_Decl_Id)
5382 and then Nkind (Gen_Id) = N_Expanded_Name
5383 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5384 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5386 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5388 ("generic unit & is implicitly declared in &",
5389 Defining_Unit_Name (N), Gen_Unit);
5390 Error_Msg_N ("\instance must have different name",
5391 Defining_Unit_Name (N));
5393 end Check_Hidden_Child_Unit;
5395 ------------------------
5396 -- Check_Private_View --
5397 ------------------------
5399 procedure Check_Private_View (N : Node_Id) is
5400 T : constant Entity_Id := Etype (N);
5404 -- Exchange views if the type was not private in the generic but is
5405 -- private at the point of instantiation. Do not exchange views if
5406 -- the scope of the type is in scope. This can happen if both generic
5407 -- and instance are sibling units, or if type is defined in a parent.
5408 -- In this case the visibility of the type will be correct for all
5412 BT := Base_Type (T);
5414 if Is_Private_Type (T)
5415 and then not Has_Private_View (N)
5416 and then Present (Full_View (T))
5417 and then not In_Open_Scopes (Scope (T))
5419 -- In the generic, the full type was visible. Save the private
5420 -- entity, for subsequent exchange.
5424 elsif Has_Private_View (N)
5425 and then not Is_Private_Type (T)
5426 and then not Has_Been_Exchanged (T)
5427 and then Etype (Get_Associated_Node (N)) /= T
5429 -- Only the private declaration was visible in the generic. If
5430 -- the type appears in a subtype declaration, the subtype in the
5431 -- instance must have a view compatible with that of its parent,
5432 -- which must be exchanged (see corresponding code in Restore_
5433 -- Private_Views). Otherwise, if the type is defined in a parent
5434 -- unit, leave full visibility within instance, which is safe.
5436 if In_Open_Scopes (Scope (Base_Type (T)))
5437 and then not Is_Private_Type (Base_Type (T))
5438 and then Comes_From_Source (Base_Type (T))
5442 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5443 or else not In_Private_Part (Scope (Base_Type (T)))
5445 Prepend_Elmt (T, Exchanged_Views);
5446 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5449 -- For composite types with inconsistent representation exchange
5450 -- component types accordingly.
5452 elsif Is_Access_Type (T)
5453 and then Is_Private_Type (Designated_Type (T))
5454 and then not Has_Private_View (N)
5455 and then Present (Full_View (Designated_Type (T)))
5457 Switch_View (Designated_Type (T));
5459 elsif Is_Array_Type (T) then
5460 if Is_Private_Type (Component_Type (T))
5461 and then not Has_Private_View (N)
5462 and then Present (Full_View (Component_Type (T)))
5464 Switch_View (Component_Type (T));
5467 -- The normal exchange mechanism relies on the setting of a
5468 -- flag on the reference in the generic. However, an additional
5469 -- mechanism is needed for types that are not explicitly mentioned
5470 -- in the generic, but may be needed in expanded code in the
5471 -- instance. This includes component types of arrays and
5472 -- designated types of access types. This processing must also
5473 -- include the index types of arrays which we take care of here.
5480 Indx := First_Index (T);
5481 Typ := Base_Type (Etype (Indx));
5482 while Present (Indx) loop
5483 if Is_Private_Type (Typ)
5484 and then Present (Full_View (Typ))
5493 elsif Is_Private_Type (T)
5494 and then Present (Full_View (T))
5495 and then Is_Array_Type (Full_View (T))
5496 and then Is_Private_Type (Component_Type (Full_View (T)))
5500 -- Finally, a non-private subtype may have a private base type, which
5501 -- must be exchanged for consistency. This can happen when a package
5502 -- body is instantiated, when the scope stack is empty but in fact
5503 -- the subtype and the base type are declared in an enclosing scope.
5505 -- Note that in this case we introduce an inconsistency in the view
5506 -- set, because we switch the base type BT, but there could be some
5507 -- private dependent subtypes of BT which remain unswitched. Such
5508 -- subtypes might need to be switched at a later point (see specific
5509 -- provision for that case in Switch_View).
5511 elsif not Is_Private_Type (T)
5512 and then not Has_Private_View (N)
5513 and then Is_Private_Type (BT)
5514 and then Present (Full_View (BT))
5515 and then not Is_Generic_Type (BT)
5516 and then not In_Open_Scopes (BT)
5518 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5519 Exchange_Declarations (BT);
5522 end Check_Private_View;
5524 --------------------------
5525 -- Contains_Instance_Of --
5526 --------------------------
5528 function Contains_Instance_Of
5531 N : Node_Id) return Boolean
5539 -- Verify that there are no circular instantiations. We check whether
5540 -- the unit contains an instance of the current scope or some enclosing
5541 -- scope (in case one of the instances appears in a subunit). Longer
5542 -- circularities involving subunits might seem too pathological to
5543 -- consider, but they were not too pathological for the authors of
5544 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5545 -- enclosing generic scopes as containing an instance.
5548 -- Within a generic subprogram body, the scope is not generic, to
5549 -- allow for recursive subprograms. Use the declaration to determine
5550 -- whether this is a generic unit.
5552 if Ekind (Scop) = E_Generic_Package
5553 or else (Is_Subprogram (Scop)
5554 and then Nkind (Unit_Declaration_Node (Scop)) =
5555 N_Generic_Subprogram_Declaration)
5557 Elmt := First_Elmt (Inner_Instances (Inner));
5559 while Present (Elmt) loop
5560 if Node (Elmt) = Scop then
5561 Error_Msg_Node_2 := Inner;
5563 ("circular Instantiation: & instantiated within &!",
5567 elsif Node (Elmt) = Inner then
5570 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5571 Error_Msg_Node_2 := Inner;
5573 ("circular Instantiation: & instantiated within &!",
5581 -- Indicate that Inner is being instantiated within Scop
5583 Append_Elmt (Inner, Inner_Instances (Scop));
5586 if Scop = Standard_Standard then
5589 Scop := Scope (Scop);
5594 end Contains_Instance_Of;
5596 -----------------------
5597 -- Copy_Generic_Node --
5598 -----------------------
5600 function Copy_Generic_Node
5602 Parent_Id : Node_Id;
5603 Instantiating : Boolean) return Node_Id
5608 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5609 -- Check the given value of one of the Fields referenced by the
5610 -- current node to determine whether to copy it recursively. The
5611 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5612 -- value (Sloc, Uint, Char) in which case it need not be copied.
5614 procedure Copy_Descendants;
5615 -- Common utility for various nodes
5617 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5618 -- Make copy of element list
5620 function Copy_Generic_List
5622 Parent_Id : Node_Id) return List_Id;
5623 -- Apply Copy_Node recursively to the members of a node list
5625 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5626 -- True if an identifier is part of the defining program unit name
5627 -- of a child unit. The entity of such an identifier must be kept
5628 -- (for ASIS use) even though as the name of an enclosing generic
5629 -- it would otherwise not be preserved in the generic tree.
5631 ----------------------
5632 -- Copy_Descendants --
5633 ----------------------
5635 procedure Copy_Descendants is
5637 use Atree.Unchecked_Access;
5638 -- This code section is part of the implementation of an untyped
5639 -- tree traversal, so it needs direct access to node fields.
5642 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5643 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5644 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5645 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5646 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5647 end Copy_Descendants;
5649 -----------------------------
5650 -- Copy_Generic_Descendant --
5651 -----------------------------
5653 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5655 if D = Union_Id (Empty) then
5658 elsif D in Node_Range then
5660 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5662 elsif D in List_Range then
5663 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5665 elsif D in Elist_Range then
5666 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5668 -- Nothing else is copyable (e.g. Uint values), return as is
5673 end Copy_Generic_Descendant;
5675 ------------------------
5676 -- Copy_Generic_Elist --
5677 ------------------------
5679 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
5686 M := First_Elmt (E);
5687 while Present (M) loop
5689 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
5698 end Copy_Generic_Elist;
5700 -----------------------
5701 -- Copy_Generic_List --
5702 -----------------------
5704 function Copy_Generic_List
5706 Parent_Id : Node_Id) return List_Id
5714 Set_Parent (New_L, Parent_Id);
5717 while Present (N) loop
5718 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
5727 end Copy_Generic_List;
5729 ---------------------------
5730 -- In_Defining_Unit_Name --
5731 ---------------------------
5733 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
5735 return Present (Parent (Nam))
5736 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
5738 (Nkind (Parent (Nam)) = N_Expanded_Name
5739 and then In_Defining_Unit_Name (Parent (Nam))));
5740 end In_Defining_Unit_Name;
5742 -- Start of processing for Copy_Generic_Node
5749 New_N := New_Copy (N);
5751 if Instantiating then
5752 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
5755 if not Is_List_Member (N) then
5756 Set_Parent (New_N, Parent_Id);
5759 -- If defining identifier, then all fields have been copied already
5761 if Nkind (New_N) in N_Entity then
5764 -- Special casing for identifiers and other entity names and operators
5766 elsif Nkind_In (New_N, N_Identifier,
5767 N_Character_Literal,
5770 or else Nkind (New_N) in N_Op
5772 if not Instantiating then
5774 -- Link both nodes in order to assign subsequently the entity of
5775 -- the copy to the original node, in case this is a global
5778 Set_Associated_Node (N, New_N);
5780 -- If we are within an instantiation, this is a nested generic
5781 -- that has already been analyzed at the point of definition. We
5782 -- must preserve references that were global to the enclosing
5783 -- parent at that point. Other occurrences, whether global or
5784 -- local to the current generic, must be resolved anew, so we
5785 -- reset the entity in the generic copy. A global reference has a
5786 -- smaller depth than the parent, or else the same depth in case
5787 -- both are distinct compilation units.
5788 -- A child unit is implicitly declared within the enclosing parent
5789 -- but is in fact global to it, and must be preserved.
5791 -- It is also possible for Current_Instantiated_Parent to be
5792 -- defined, and for this not to be a nested generic, namely if the
5793 -- unit is loaded through Rtsfind. In that case, the entity of
5794 -- New_N is only a link to the associated node, and not a defining
5797 -- The entities for parent units in the defining_program_unit of a
5798 -- generic child unit are established when the context of the unit
5799 -- is first analyzed, before the generic copy is made. They are
5800 -- preserved in the copy for use in ASIS queries.
5802 Ent := Entity (New_N);
5804 if No (Current_Instantiated_Parent.Gen_Id) then
5806 or else Nkind (Ent) /= N_Defining_Identifier
5807 or else not In_Defining_Unit_Name (N)
5809 Set_Associated_Node (New_N, Empty);
5814 not Nkind_In (Ent, N_Defining_Identifier,
5815 N_Defining_Character_Literal,
5816 N_Defining_Operator_Symbol)
5817 or else No (Scope (Ent))
5819 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
5820 and then not Is_Child_Unit (Ent))
5822 (Scope_Depth (Scope (Ent)) >
5823 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
5825 Get_Source_Unit (Ent) =
5826 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
5828 Set_Associated_Node (New_N, Empty);
5831 -- Case of instantiating identifier or some other name or operator
5834 -- If the associated node is still defined, the entity in it is
5835 -- global, and must be copied to the instance. If this copy is
5836 -- being made for a body to inline, it is applied to an
5837 -- instantiated tree, and the entity is already present and must
5838 -- be also preserved.
5841 Assoc : constant Node_Id := Get_Associated_Node (N);
5844 if Present (Assoc) then
5845 if Nkind (Assoc) = Nkind (N) then
5846 Set_Entity (New_N, Entity (Assoc));
5847 Check_Private_View (N);
5849 elsif Nkind (Assoc) = N_Function_Call then
5850 Set_Entity (New_N, Entity (Name (Assoc)));
5852 elsif Nkind_In (Assoc, N_Defining_Identifier,
5853 N_Defining_Character_Literal,
5854 N_Defining_Operator_Symbol)
5855 and then Expander_Active
5857 -- Inlining case: we are copying a tree that contains
5858 -- global entities, which are preserved in the copy to be
5859 -- used for subsequent inlining.
5864 Set_Entity (New_N, Empty);
5870 -- For expanded name, we must copy the Prefix and Selector_Name
5872 if Nkind (N) = N_Expanded_Name then
5874 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
5876 Set_Selector_Name (New_N,
5877 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
5879 -- For operators, we must copy the right operand
5881 elsif Nkind (N) in N_Op then
5882 Set_Right_Opnd (New_N,
5883 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
5885 -- And for binary operators, the left operand as well
5887 if Nkind (N) in N_Binary_Op then
5888 Set_Left_Opnd (New_N,
5889 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
5893 -- Special casing for stubs
5895 elsif Nkind (N) in N_Body_Stub then
5897 -- In any case, we must copy the specification or defining
5898 -- identifier as appropriate.
5900 if Nkind (N) = N_Subprogram_Body_Stub then
5901 Set_Specification (New_N,
5902 Copy_Generic_Node (Specification (N), New_N, Instantiating));
5905 Set_Defining_Identifier (New_N,
5907 (Defining_Identifier (N), New_N, Instantiating));
5910 -- If we are not instantiating, then this is where we load and
5911 -- analyze subunits, i.e. at the point where the stub occurs. A
5912 -- more permissive system might defer this analysis to the point
5913 -- of instantiation, but this seems to complicated for now.
5915 if not Instantiating then
5917 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
5919 Unum : Unit_Number_Type;
5923 -- Make sure that, if it is a subunit of the main unit that is
5924 -- preprocessed and if -gnateG is specified, the preprocessed
5925 -- file will be written.
5927 Lib.Analysing_Subunit_Of_Main :=
5928 Lib.In_Extended_Main_Source_Unit (N);
5931 (Load_Name => Subunit_Name,
5935 Lib.Analysing_Subunit_Of_Main := False;
5937 -- If the proper body is not found, a warning message will be
5938 -- emitted when analyzing the stub, or later at the point
5939 -- of instantiation. Here we just leave the stub as is.
5941 if Unum = No_Unit then
5942 Subunits_Missing := True;
5943 goto Subunit_Not_Found;
5946 Subunit := Cunit (Unum);
5948 if Nkind (Unit (Subunit)) /= N_Subunit then
5950 ("found child unit instead of expected SEPARATE subunit",
5952 Error_Msg_Sloc := Sloc (N);
5953 Error_Msg_N ("\to complete stub #", Subunit);
5954 goto Subunit_Not_Found;
5957 -- We must create a generic copy of the subunit, in order to
5958 -- perform semantic analysis on it, and we must replace the
5959 -- stub in the original generic unit with the subunit, in order
5960 -- to preserve non-local references within.
5962 -- Only the proper body needs to be copied. Library_Unit and
5963 -- context clause are simply inherited by the generic copy.
5964 -- Note that the copy (which may be recursive if there are
5965 -- nested subunits) must be done first, before attaching it to
5966 -- the enclosing generic.
5970 (Proper_Body (Unit (Subunit)),
5971 Empty, Instantiating => False);
5973 -- Now place the original proper body in the original generic
5974 -- unit. This is a body, not a compilation unit.
5976 Rewrite (N, Proper_Body (Unit (Subunit)));
5977 Set_Is_Compilation_Unit (Defining_Entity (N), False);
5978 Set_Was_Originally_Stub (N);
5980 -- Finally replace the body of the subunit with its copy, and
5981 -- make this new subunit into the library unit of the generic
5982 -- copy, which does not have stubs any longer.
5984 Set_Proper_Body (Unit (Subunit), New_Body);
5985 Set_Library_Unit (New_N, Subunit);
5986 Inherit_Context (Unit (Subunit), N);
5989 -- If we are instantiating, this must be an error case, since
5990 -- otherwise we would have replaced the stub node by the proper body
5991 -- that corresponds. So just ignore it in the copy (i.e. we have
5992 -- copied it, and that is good enough).
5998 <<Subunit_Not_Found>> null;
6000 -- If the node is a compilation unit, it is the subunit of a stub, which
6001 -- has been loaded already (see code below). In this case, the library
6002 -- unit field of N points to the parent unit (which is a compilation
6003 -- unit) and need not (and cannot!) be copied.
6005 -- When the proper body of the stub is analyzed, the library_unit link
6006 -- is used to establish the proper context (see sem_ch10).
6008 -- The other fields of a compilation unit are copied as usual
6010 elsif Nkind (N) = N_Compilation_Unit then
6012 -- This code can only be executed when not instantiating, because in
6013 -- the copy made for an instantiation, the compilation unit node has
6014 -- disappeared at the point that a stub is replaced by its proper
6017 pragma Assert (not Instantiating);
6019 Set_Context_Items (New_N,
6020 Copy_Generic_List (Context_Items (N), New_N));
6023 Copy_Generic_Node (Unit (N), New_N, False));
6025 Set_First_Inlined_Subprogram (New_N,
6027 (First_Inlined_Subprogram (N), New_N, False));
6029 Set_Aux_Decls_Node (New_N,
6030 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
6032 -- For an assignment node, the assignment is known to be semantically
6033 -- legal if we are instantiating the template. This avoids incorrect
6034 -- diagnostics in generated code.
6036 elsif Nkind (N) = N_Assignment_Statement then
6038 -- Copy name and expression fields in usual manner
6041 Copy_Generic_Node (Name (N), New_N, Instantiating));
6043 Set_Expression (New_N,
6044 Copy_Generic_Node (Expression (N), New_N, Instantiating));
6046 if Instantiating then
6047 Set_Assignment_OK (Name (New_N), True);
6050 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
6051 if not Instantiating then
6052 Set_Associated_Node (N, New_N);
6055 if Present (Get_Associated_Node (N))
6056 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
6058 -- In the generic the aggregate has some composite type. If at
6059 -- the point of instantiation the type has a private view,
6060 -- install the full view (and that of its ancestors, if any).
6063 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
6068 and then Is_Private_Type (T)
6074 and then Is_Tagged_Type (T)
6075 and then Is_Derived_Type (T)
6077 Rt := Root_Type (T);
6082 if Is_Private_Type (T) then
6093 -- Do not copy the associated node, which points to
6094 -- the generic copy of the aggregate.
6097 use Atree.Unchecked_Access;
6098 -- This code section is part of the implementation of an untyped
6099 -- tree traversal, so it needs direct access to node fields.
6102 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
6103 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
6104 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
6105 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
6108 -- Allocators do not have an identifier denoting the access type,
6109 -- so we must locate it through the expression to check whether
6110 -- the views are consistent.
6112 elsif Nkind (N) = N_Allocator
6113 and then Nkind (Expression (N)) = N_Qualified_Expression
6114 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
6115 and then Instantiating
6118 T : constant Node_Id :=
6119 Get_Associated_Node (Subtype_Mark (Expression (N)));
6125 -- Retrieve the allocator node in the generic copy
6127 Acc_T := Etype (Parent (Parent (T)));
6129 and then Is_Private_Type (Acc_T)
6131 Switch_View (Acc_T);
6138 -- For a proper body, we must catch the case of a proper body that
6139 -- replaces a stub. This represents the point at which a separate
6140 -- compilation unit, and hence template file, may be referenced, so we
6141 -- must make a new source instantiation entry for the template of the
6142 -- subunit, and ensure that all nodes in the subunit are adjusted using
6143 -- this new source instantiation entry.
6145 elsif Nkind (N) in N_Proper_Body then
6147 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
6150 if Instantiating and then Was_Originally_Stub (N) then
6151 Create_Instantiation_Source
6152 (Instantiation_Node,
6153 Defining_Entity (N),
6158 -- Now copy the fields of the proper body, using the new
6159 -- adjustment factor if one was needed as per test above.
6163 -- Restore the original adjustment factor in case changed
6165 S_Adjustment := Save_Adjustment;
6168 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6169 -- generic unit, not to the instantiating unit.
6171 elsif Nkind (N) = N_Pragma
6172 and then Instantiating
6175 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N);
6177 if Prag_Id = Pragma_Ident
6178 or else Prag_Id = Pragma_Comment
6180 New_N := Make_Null_Statement (Sloc (N));
6186 elsif Nkind_In (N, N_Integer_Literal,
6190 -- No descendant fields need traversing
6194 -- For the remaining nodes, copy recursively their descendants
6200 and then Nkind (N) = N_Subprogram_Body
6202 Set_Generic_Parent (Specification (New_N), N);
6207 end Copy_Generic_Node;
6209 ----------------------------
6210 -- Denotes_Formal_Package --
6211 ----------------------------
6213 function Denotes_Formal_Package
6215 On_Exit : Boolean := False;
6216 Instance : Entity_Id := Empty) return Boolean
6219 Scop : constant Entity_Id := Scope (Pack);
6222 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
6223 -- The package in question may be an actual for a previous formal
6224 -- package P of the current instance, so examine its actuals as well.
6225 -- This must be recursive over other formal packages.
6227 ----------------------------------
6228 -- Is_Actual_Of_Previous_Formal --
6229 ----------------------------------
6231 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
6235 E1 := First_Entity (P);
6236 while Present (E1) and then E1 /= Instance loop
6237 if Ekind (E1) = E_Package
6238 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
6240 if Renamed_Object (E1) = Pack then
6244 or else Renamed_Object (E1) = P
6248 elsif Is_Actual_Of_Previous_Formal (E1) then
6257 end Is_Actual_Of_Previous_Formal;
6259 -- Start of processing for Denotes_Formal_Package
6265 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6267 Par := Current_Instantiated_Parent.Act_Id;
6270 if Ekind (Scop) = E_Generic_Package
6271 or else Nkind (Unit_Declaration_Node (Scop)) =
6272 N_Generic_Subprogram_Declaration
6276 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6277 N_Formal_Package_Declaration
6285 -- Check whether this package is associated with a formal package of
6286 -- the enclosing instantiation. Iterate over the list of renamings.
6288 E := First_Entity (Par);
6289 while Present (E) loop
6290 if Ekind (E) /= E_Package
6291 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6295 elsif Renamed_Object (E) = Par then
6298 elsif Renamed_Object (E) = Pack then
6301 elsif Is_Actual_Of_Previous_Formal (E) then
6311 end Denotes_Formal_Package;
6317 procedure End_Generic is
6319 -- ??? More things could be factored out in this routine. Should
6320 -- probably be done at a later stage.
6322 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6323 Generic_Flags.Decrement_Last;
6325 Expander_Mode_Restore;
6328 ----------------------
6329 -- Find_Actual_Type --
6330 ----------------------
6332 function Find_Actual_Type
6334 Gen_Type : Entity_Id) return Entity_Id
6336 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
6340 -- Special processing only applies to child units
6342 if not Is_Child_Unit (Gen_Scope) then
6343 return Get_Instance_Of (Typ);
6345 -- If designated or component type is itself a formal of the child unit,
6346 -- its instance is available.
6348 elsif Scope (Typ) = Gen_Scope then
6349 return Get_Instance_Of (Typ);
6351 -- If the array or access type is not declared in the parent unit,
6352 -- no special processing needed.
6354 elsif not Is_Generic_Type (Typ)
6355 and then Scope (Gen_Scope) /= Scope (Typ)
6357 return Get_Instance_Of (Typ);
6359 -- Otherwise, retrieve designated or component type by visibility
6362 T := Current_Entity (Typ);
6363 while Present (T) loop
6364 if In_Open_Scopes (Scope (T)) then
6367 elsif Is_Generic_Actual_Type (T) then
6376 end Find_Actual_Type;
6378 ----------------------------
6379 -- Freeze_Subprogram_Body --
6380 ----------------------------
6382 procedure Freeze_Subprogram_Body
6383 (Inst_Node : Node_Id;
6385 Pack_Id : Entity_Id)
6388 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6389 Par : constant Entity_Id := Scope (Gen_Unit);
6394 function Earlier (N1, N2 : Node_Id) return Boolean;
6395 -- Yields True if N1 and N2 appear in the same compilation unit,
6396 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6397 -- traversal of the tree for the unit.
6399 function Enclosing_Body (N : Node_Id) return Node_Id;
6400 -- Find innermost package body that encloses the given node, and which
6401 -- is not a compilation unit. Freeze nodes for the instance, or for its
6402 -- enclosing body, may be inserted after the enclosing_body of the
6405 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6406 -- Find entity for given package body, and locate or create a freeze
6409 function True_Parent (N : Node_Id) return Node_Id;
6410 -- For a subunit, return parent of corresponding stub
6416 function Earlier (N1, N2 : Node_Id) return Boolean is
6422 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6423 -- Find distance from given node to enclosing compilation unit
6429 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6432 and then Nkind (P) /= N_Compilation_Unit
6434 P := True_Parent (P);
6439 -- Start of processing for Earlier
6442 Find_Depth (P1, D1);
6443 Find_Depth (P2, D2);
6453 P1 := True_Parent (P1);
6458 P2 := True_Parent (P2);
6462 -- At this point P1 and P2 are at the same distance from the root.
6463 -- We examine their parents until we find a common declarative
6464 -- list, at which point we can establish their relative placement
6465 -- by comparing their ultimate slocs. If we reach the root,
6466 -- N1 and N2 do not descend from the same declarative list (e.g.
6467 -- one is nested in the declarative part and the other is in a block
6468 -- in the statement part) and the earlier one is already frozen.
6470 while not Is_List_Member (P1)
6471 or else not Is_List_Member (P2)
6472 or else List_Containing (P1) /= List_Containing (P2)
6474 P1 := True_Parent (P1);
6475 P2 := True_Parent (P2);
6477 if Nkind (Parent (P1)) = N_Subunit then
6478 P1 := Corresponding_Stub (Parent (P1));
6481 if Nkind (Parent (P2)) = N_Subunit then
6482 P2 := Corresponding_Stub (Parent (P2));
6491 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6494 --------------------
6495 -- Enclosing_Body --
6496 --------------------
6498 function Enclosing_Body (N : Node_Id) return Node_Id is
6499 P : Node_Id := Parent (N);
6503 and then Nkind (Parent (P)) /= N_Compilation_Unit
6505 if Nkind (P) = N_Package_Body then
6507 if Nkind (Parent (P)) = N_Subunit then
6508 return Corresponding_Stub (Parent (P));
6514 P := True_Parent (P);
6520 -------------------------
6521 -- Package_Freeze_Node --
6522 -------------------------
6524 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6528 if Nkind (B) = N_Package_Body then
6529 Id := Corresponding_Spec (B);
6531 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6532 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6535 Ensure_Freeze_Node (Id);
6536 return Freeze_Node (Id);
6537 end Package_Freeze_Node;
6543 function True_Parent (N : Node_Id) return Node_Id is
6545 if Nkind (Parent (N)) = N_Subunit then
6546 return Parent (Corresponding_Stub (Parent (N)));
6552 -- Start of processing of Freeze_Subprogram_Body
6555 -- If the instance and the generic body appear within the same unit, and
6556 -- the instance precedes the generic, the freeze node for the instance
6557 -- must appear after that of the generic. If the generic is nested
6558 -- within another instance I2, then current instance must be frozen
6559 -- after I2. In both cases, the freeze nodes are those of enclosing
6560 -- packages. Otherwise, the freeze node is placed at the end of the
6561 -- current declarative part.
6563 Enc_G := Enclosing_Body (Gen_Body);
6564 Enc_I := Enclosing_Body (Inst_Node);
6565 Ensure_Freeze_Node (Pack_Id);
6566 F_Node := Freeze_Node (Pack_Id);
6568 if Is_Generic_Instance (Par)
6569 and then Present (Freeze_Node (Par))
6571 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6573 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6575 -- The parent was a premature instantiation. Insert freeze node at
6576 -- the end the current declarative part.
6578 Insert_After_Last_Decl (Inst_Node, F_Node);
6581 Insert_After (Freeze_Node (Par), F_Node);
6584 -- The body enclosing the instance should be frozen after the body that
6585 -- includes the generic, because the body of the instance may make
6586 -- references to entities therein. If the two are not in the same
6587 -- declarative part, or if the one enclosing the instance is frozen
6588 -- already, freeze the instance at the end of the current declarative
6591 elsif Is_Generic_Instance (Par)
6592 and then Present (Freeze_Node (Par))
6593 and then Present (Enc_I)
6595 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6597 (Nkind (Enc_I) = N_Package_Body
6599 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6601 -- The enclosing package may contain several instances. Rather
6602 -- than computing the earliest point at which to insert its
6603 -- freeze node, we place it at the end of the declarative part
6604 -- of the parent of the generic.
6606 Insert_After_Last_Decl
6607 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6610 Insert_After_Last_Decl (Inst_Node, F_Node);
6612 elsif Present (Enc_G)
6613 and then Present (Enc_I)
6614 and then Enc_G /= Enc_I
6615 and then Earlier (Inst_Node, Gen_Body)
6617 if Nkind (Enc_G) = N_Package_Body then
6618 E_G_Id := Corresponding_Spec (Enc_G);
6619 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6621 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6624 -- Freeze package that encloses instance, and place node after
6625 -- package that encloses generic. If enclosing package is already
6626 -- frozen we have to assume it is at the proper place. This may be
6627 -- a potential ABE that requires dynamic checking. Do not add a
6628 -- freeze node if the package that encloses the generic is inside
6629 -- the body that encloses the instance, because the freeze node
6630 -- would be in the wrong scope. Additional contortions needed if
6631 -- the bodies are within a subunit.
6634 Enclosing_Body : Node_Id;
6637 if Nkind (Enc_I) = N_Package_Body_Stub then
6638 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
6640 Enclosing_Body := Enc_I;
6643 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
6644 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
6648 -- Freeze enclosing subunit before instance
6650 Ensure_Freeze_Node (E_G_Id);
6652 if not Is_List_Member (Freeze_Node (E_G_Id)) then
6653 Insert_After (Enc_G, Freeze_Node (E_G_Id));
6656 Insert_After_Last_Decl (Inst_Node, F_Node);
6659 -- If none of the above, insert freeze node at the end of the current
6660 -- declarative part.
6662 Insert_After_Last_Decl (Inst_Node, F_Node);
6664 end Freeze_Subprogram_Body;
6670 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
6672 return Generic_Renamings.Table (E).Gen_Id;
6675 ---------------------
6676 -- Get_Instance_Of --
6677 ---------------------
6679 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
6680 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
6683 if Res /= Assoc_Null then
6684 return Generic_Renamings.Table (Res).Act_Id;
6686 -- On exit, entity is not instantiated: not a generic parameter, or
6687 -- else parameter of an inner generic unit.
6691 end Get_Instance_Of;
6693 ------------------------------------
6694 -- Get_Package_Instantiation_Node --
6695 ------------------------------------
6697 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
6698 Decl : Node_Id := Unit_Declaration_Node (A);
6702 -- If the Package_Instantiation attribute has been set on the package
6703 -- entity, then use it directly when it (or its Original_Node) refers
6704 -- to an N_Package_Instantiation node. In principle it should be
6705 -- possible to have this field set in all cases, which should be
6706 -- investigated, and would allow this function to be significantly
6709 if Present (Package_Instantiation (A)) then
6710 if Nkind (Package_Instantiation (A)) = N_Package_Instantiation then
6711 return Package_Instantiation (A);
6713 elsif Nkind (Original_Node (Package_Instantiation (A))) =
6714 N_Package_Instantiation
6716 return Original_Node (Package_Instantiation (A));
6720 -- If the instantiation is a compilation unit that does not need body
6721 -- then the instantiation node has been rewritten as a package
6722 -- declaration for the instance, and we return the original node.
6724 -- If it is a compilation unit and the instance node has not been
6725 -- rewritten, then it is still the unit of the compilation. Finally, if
6726 -- a body is present, this is a parent of the main unit whose body has
6727 -- been compiled for inlining purposes, and the instantiation node has
6728 -- been rewritten with the instance body.
6730 -- Otherwise the instantiation node appears after the declaration. If
6731 -- the entity is a formal package, the declaration may have been
6732 -- rewritten as a generic declaration (in the case of a formal with box)
6733 -- or left as a formal package declaration if it has actuals, and is
6734 -- found with a forward search.
6736 if Nkind (Parent (Decl)) = N_Compilation_Unit then
6737 if Nkind (Decl) = N_Package_Declaration
6738 and then Present (Corresponding_Body (Decl))
6740 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
6743 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
6744 return Original_Node (Decl);
6746 return Unit (Parent (Decl));
6749 elsif Nkind (Decl) = N_Package_Declaration
6750 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
6752 return Original_Node (Decl);
6755 Inst := Next (Decl);
6756 while not Nkind_In (Inst, N_Package_Instantiation,
6757 N_Formal_Package_Declaration)
6764 end Get_Package_Instantiation_Node;
6766 ------------------------
6767 -- Has_Been_Exchanged --
6768 ------------------------
6770 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
6774 Next := First_Elmt (Exchanged_Views);
6775 while Present (Next) loop
6776 if Full_View (Node (Next)) = E then
6784 end Has_Been_Exchanged;
6790 function Hash (F : Entity_Id) return HTable_Range is
6792 return HTable_Range (F mod HTable_Size);
6795 ------------------------
6796 -- Hide_Current_Scope --
6797 ------------------------
6799 procedure Hide_Current_Scope is
6800 C : constant Entity_Id := Current_Scope;
6804 Set_Is_Hidden_Open_Scope (C);
6806 E := First_Entity (C);
6807 while Present (E) loop
6808 if Is_Immediately_Visible (E) then
6809 Set_Is_Immediately_Visible (E, False);
6810 Append_Elmt (E, Hidden_Entities);
6816 -- Make the scope name invisible as well. This is necessary, but might
6817 -- conflict with calls to Rtsfind later on, in case the scope is a
6818 -- predefined one. There is no clean solution to this problem, so for
6819 -- now we depend on the user not redefining Standard itself in one of
6820 -- the parent units.
6822 if Is_Immediately_Visible (C)
6823 and then C /= Standard_Standard
6825 Set_Is_Immediately_Visible (C, False);
6826 Append_Elmt (C, Hidden_Entities);
6829 end Hide_Current_Scope;
6835 procedure Init_Env is
6836 Saved : Instance_Env;
6839 Saved.Instantiated_Parent := Current_Instantiated_Parent;
6840 Saved.Exchanged_Views := Exchanged_Views;
6841 Saved.Hidden_Entities := Hidden_Entities;
6842 Saved.Current_Sem_Unit := Current_Sem_Unit;
6843 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
6844 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
6846 -- Save configuration switches. These may be reset if the unit is a
6847 -- predefined unit, and the current mode is not Ada 2005.
6849 Save_Opt_Config_Switches (Saved.Switches);
6851 Instance_Envs.Append (Saved);
6853 Exchanged_Views := New_Elmt_List;
6854 Hidden_Entities := New_Elmt_List;
6856 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6857 -- this is set properly in Set_Instance_Env.
6859 Current_Instantiated_Parent :=
6860 (Current_Scope, Current_Scope, Assoc_Null);
6863 ------------------------------
6864 -- In_Same_Declarative_Part --
6865 ------------------------------
6867 function In_Same_Declarative_Part
6869 Inst : Node_Id) return Boolean
6871 Decls : constant Node_Id := Parent (F_Node);
6872 Nod : Node_Id := Parent (Inst);
6875 while Present (Nod) loop
6879 elsif Nkind_In (Nod, N_Subprogram_Body,
6887 elsif Nkind (Nod) = N_Subunit then
6888 Nod := Corresponding_Stub (Nod);
6890 elsif Nkind (Nod) = N_Compilation_Unit then
6894 Nod := Parent (Nod);
6899 end In_Same_Declarative_Part;
6901 ---------------------
6902 -- In_Main_Context --
6903 ---------------------
6905 function In_Main_Context (E : Entity_Id) return Boolean is
6911 if not Is_Compilation_Unit (E)
6912 or else Ekind (E) /= E_Package
6913 or else In_Private_Part (E)
6918 Context := Context_Items (Cunit (Main_Unit));
6920 Clause := First (Context);
6921 while Present (Clause) loop
6922 if Nkind (Clause) = N_With_Clause then
6923 Nam := Name (Clause);
6925 -- If the current scope is part of the context of the main unit,
6926 -- analysis of the corresponding with_clause is not complete, and
6927 -- the entity is not set. We use the Chars field directly, which
6928 -- might produce false positives in rare cases, but guarantees
6929 -- that we produce all the instance bodies we will need.
6931 if (Is_Entity_Name (Nam)
6932 and then Chars (Nam) = Chars (E))
6933 or else (Nkind (Nam) = N_Selected_Component
6934 and then Chars (Selector_Name (Nam)) = Chars (E))
6944 end In_Main_Context;
6946 ---------------------
6947 -- Inherit_Context --
6948 ---------------------
6950 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
6951 Current_Context : List_Id;
6952 Current_Unit : Node_Id;
6957 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
6959 -- The inherited context is attached to the enclosing compilation
6960 -- unit. This is either the main unit, or the declaration for the
6961 -- main unit (in case the instantiation appears within the package
6962 -- declaration and the main unit is its body).
6964 Current_Unit := Parent (Inst);
6965 while Present (Current_Unit)
6966 and then Nkind (Current_Unit) /= N_Compilation_Unit
6968 Current_Unit := Parent (Current_Unit);
6971 Current_Context := Context_Items (Current_Unit);
6973 Item := First (Context_Items (Parent (Gen_Decl)));
6974 while Present (Item) loop
6975 if Nkind (Item) = N_With_Clause then
6977 -- Take care to prevent direct cyclic with's, which can happen
6978 -- if the generic body with's the current unit. Such a case
6979 -- would result in binder errors (or run-time errors if the
6980 -- -gnatE switch is in effect), but we want to prevent it here,
6981 -- because Sem.Walk_Library_Items doesn't like cycles. Note
6982 -- that we don't bother to detect indirect cycles.
6984 if Library_Unit (Item) /= Current_Unit then
6985 New_I := New_Copy (Item);
6986 Set_Implicit_With (New_I, True);
6987 Append (New_I, Current_Context);
6994 end Inherit_Context;
7000 procedure Initialize is
7002 Generic_Renamings.Init;
7005 Generic_Renamings_HTable.Reset;
7006 Circularity_Detected := False;
7007 Exchanged_Views := No_Elist;
7008 Hidden_Entities := No_Elist;
7011 ----------------------------
7012 -- Insert_After_Last_Decl --
7013 ----------------------------
7015 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
7016 L : List_Id := List_Containing (N);
7017 P : constant Node_Id := Parent (L);
7020 if not Is_List_Member (F_Node) then
7021 if Nkind (P) = N_Package_Specification
7022 and then L = Visible_Declarations (P)
7023 and then Present (Private_Declarations (P))
7024 and then not Is_Empty_List (Private_Declarations (P))
7026 L := Private_Declarations (P);
7029 Insert_After (Last (L), F_Node);
7031 end Insert_After_Last_Decl;
7037 procedure Install_Body
7038 (Act_Body : Node_Id;
7043 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
7044 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
7045 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
7046 Par : constant Entity_Id := Scope (Gen_Id);
7047 Gen_Unit : constant Node_Id :=
7048 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
7049 Orig_Body : Node_Id := Gen_Body;
7051 Body_Unit : Node_Id;
7053 Must_Delay : Boolean;
7055 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
7056 -- Find subprogram (if any) that encloses instance and/or generic body
7058 function True_Sloc (N : Node_Id) return Source_Ptr;
7059 -- If the instance is nested inside a generic unit, the Sloc of the
7060 -- instance indicates the place of the original definition, not the
7061 -- point of the current enclosing instance. Pending a better usage of
7062 -- Slocs to indicate instantiation places, we determine the place of
7063 -- origin of a node by finding the maximum sloc of any ancestor node.
7064 -- Why is this not equivalent to Top_Level_Location ???
7066 --------------------
7067 -- Enclosing_Subp --
7068 --------------------
7070 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
7071 Scop : Entity_Id := Scope (Id);
7074 while Scop /= Standard_Standard
7075 and then not Is_Overloadable (Scop)
7077 Scop := Scope (Scop);
7087 function True_Sloc (N : Node_Id) return Source_Ptr is
7094 while Present (N1) and then N1 /= Act_Unit loop
7095 if Sloc (N1) > Res then
7105 -- Start of processing for Install_Body
7109 -- If the body is a subunit, the freeze point is the corresponding
7110 -- stub in the current compilation, not the subunit itself.
7112 if Nkind (Parent (Gen_Body)) = N_Subunit then
7113 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
7115 Orig_Body := Gen_Body;
7118 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
7120 -- If the instantiation and the generic definition appear in the same
7121 -- package declaration, this is an early instantiation. If they appear
7122 -- in the same declarative part, it is an early instantiation only if
7123 -- the generic body appears textually later, and the generic body is
7124 -- also in the main unit.
7126 -- If instance is nested within a subprogram, and the generic body is
7127 -- not, the instance is delayed because the enclosing body is. If
7128 -- instance and body are within the same scope, or the same sub-
7129 -- program body, indicate explicitly that the instance is delayed.
7132 (Gen_Unit = Act_Unit
7133 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
7134 N_Generic_Package_Declaration)
7135 or else (Gen_Unit = Body_Unit
7136 and then True_Sloc (N) < Sloc (Orig_Body)))
7137 and then Is_In_Main_Unit (Gen_Unit)
7138 and then (Scope (Act_Id) = Scope (Gen_Id)
7140 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
7142 -- If this is an early instantiation, the freeze node is placed after
7143 -- the generic body. Otherwise, if the generic appears in an instance,
7144 -- we cannot freeze the current instance until the outer one is frozen.
7145 -- This is only relevant if the current instance is nested within some
7146 -- inner scope not itself within the outer instance. If this scope is
7147 -- a package body in the same declarative part as the outer instance,
7148 -- then that body needs to be frozen after the outer instance. Finally,
7149 -- if no delay is needed, we place the freeze node at the end of the
7150 -- current declarative part.
7152 if Expander_Active then
7153 Ensure_Freeze_Node (Act_Id);
7154 F_Node := Freeze_Node (Act_Id);
7157 Insert_After (Orig_Body, F_Node);
7159 elsif Is_Generic_Instance (Par)
7160 and then Present (Freeze_Node (Par))
7161 and then Scope (Act_Id) /= Par
7163 -- Freeze instance of inner generic after instance of enclosing
7166 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
7167 Insert_After (Freeze_Node (Par), F_Node);
7169 -- Freeze package enclosing instance of inner generic after
7170 -- instance of enclosing generic.
7172 elsif Nkind (Parent (N)) = N_Package_Body
7173 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
7177 Enclosing : constant Entity_Id :=
7178 Corresponding_Spec (Parent (N));
7181 Insert_After_Last_Decl (N, F_Node);
7182 Ensure_Freeze_Node (Enclosing);
7184 if not Is_List_Member (Freeze_Node (Enclosing)) then
7185 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
7190 Insert_After_Last_Decl (N, F_Node);
7194 Insert_After_Last_Decl (N, F_Node);
7198 Set_Is_Frozen (Act_Id);
7199 Insert_Before (N, Act_Body);
7200 Mark_Rewrite_Insertion (Act_Body);
7203 -----------------------------
7204 -- Install_Formal_Packages --
7205 -----------------------------
7207 procedure Install_Formal_Packages (Par : Entity_Id) is
7210 Gen_E : Entity_Id := Empty;
7213 E := First_Entity (Par);
7215 -- In we are installing an instance parent, locate the formal packages
7216 -- of its generic parent.
7218 if Is_Generic_Instance (Par) then
7219 Gen := Generic_Parent (Specification (Unit_Declaration_Node (Par)));
7220 Gen_E := First_Entity (Gen);
7223 while Present (E) loop
7224 if Ekind (E) = E_Package
7225 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
7227 -- If this is the renaming for the parent instance, done
7229 if Renamed_Object (E) = Par then
7232 -- The visibility of a formal of an enclosing generic is already
7235 elsif Denotes_Formal_Package (E) then
7238 elsif Present (Associated_Formal_Package (E)) then
7239 Check_Generic_Actuals (Renamed_Object (E), True);
7240 Set_Is_Hidden (E, False);
7242 -- Find formal package in generic unit that corresponds to
7243 -- (instance of) formal package in instance.
7245 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
7246 Next_Entity (Gen_E);
7249 if Present (Gen_E) then
7250 Map_Formal_Package_Entities (Gen_E, E);
7256 if Present (Gen_E) then
7257 Next_Entity (Gen_E);
7260 end Install_Formal_Packages;
7262 --------------------
7263 -- Install_Parent --
7264 --------------------
7266 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
7267 Ancestors : constant Elist_Id := New_Elmt_List;
7268 S : constant Entity_Id := Current_Scope;
7269 Inst_Par : Entity_Id;
7270 First_Par : Entity_Id;
7271 Inst_Node : Node_Id;
7272 Gen_Par : Entity_Id;
7273 First_Gen : Entity_Id;
7276 procedure Install_Noninstance_Specs (Par : Entity_Id);
7277 -- Install the scopes of noninstance parent units ending with Par
7279 procedure Install_Spec (Par : Entity_Id);
7280 -- The child unit is within the declarative part of the parent, so
7281 -- the declarations within the parent are immediately visible.
7283 -------------------------------
7284 -- Install_Noninstance_Specs --
7285 -------------------------------
7287 procedure Install_Noninstance_Specs (Par : Entity_Id) is
7290 and then Par /= Standard_Standard
7291 and then not In_Open_Scopes (Par)
7293 Install_Noninstance_Specs (Scope (Par));
7296 end Install_Noninstance_Specs;
7302 procedure Install_Spec (Par : Entity_Id) is
7303 Spec : constant Node_Id :=
7304 Specification (Unit_Declaration_Node (Par));
7307 -- If this parent of the child instance is a top-level unit,
7308 -- then record the unit and its visibility for later resetting
7309 -- in Remove_Parent. We exclude units that are generic instances,
7310 -- as we only want to record this information for the ultimate
7311 -- top-level noninstance parent (is that always correct???).
7313 if Scope (Par) = Standard_Standard
7314 and then not Is_Generic_Instance (Par)
7316 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7317 Instance_Parent_Unit := Par;
7320 -- Open the parent scope and make it and its declarations visible.
7321 -- If this point is not within a body, then only the visible
7322 -- declarations should be made visible, and installation of the
7323 -- private declarations is deferred until the appropriate point
7324 -- within analysis of the spec being instantiated (see the handling
7325 -- of parent visibility in Analyze_Package_Specification). This is
7326 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7327 -- private view problems that occur when compiling instantiations of
7328 -- a generic child of that package (Generic_Dispatching_Constructor).
7329 -- If the instance freezes a tagged type, inlinings of operations
7330 -- from Ada.Tags may need the full view of type Tag. If inlining took
7331 -- proper account of establishing visibility of inlined subprograms'
7332 -- parents then it should be possible to remove this
7333 -- special check. ???
7336 Set_Is_Immediately_Visible (Par);
7337 Install_Visible_Declarations (Par);
7338 Set_Use (Visible_Declarations (Spec));
7340 if In_Body or else Is_RTU (Par, Ada_Tags) then
7341 Install_Private_Declarations (Par);
7342 Set_Use (Private_Declarations (Spec));
7346 -- Start of processing for Install_Parent
7349 -- We need to install the parent instance to compile the instantiation
7350 -- of the child, but the child instance must appear in the current
7351 -- scope. Given that we cannot place the parent above the current scope
7352 -- in the scope stack, we duplicate the current scope and unstack both
7353 -- after the instantiation is complete.
7355 -- If the parent is itself the instantiation of a child unit, we must
7356 -- also stack the instantiation of its parent, and so on. Each such
7357 -- ancestor is the prefix of the name in a prior instantiation.
7359 -- If this is a nested instance, the parent unit itself resolves to
7360 -- a renaming of the parent instance, whose declaration we need.
7362 -- Finally, the parent may be a generic (not an instance) when the
7363 -- child unit appears as a formal package.
7367 if Present (Renamed_Entity (Inst_Par)) then
7368 Inst_Par := Renamed_Entity (Inst_Par);
7371 First_Par := Inst_Par;
7374 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7376 First_Gen := Gen_Par;
7378 while Present (Gen_Par)
7379 and then Is_Child_Unit (Gen_Par)
7381 -- Load grandparent instance as well
7383 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7385 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7386 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7388 if Present (Renamed_Entity (Inst_Par)) then
7389 Inst_Par := Renamed_Entity (Inst_Par);
7394 (Specification (Unit_Declaration_Node (Inst_Par)));
7396 if Present (Gen_Par) then
7397 Prepend_Elmt (Inst_Par, Ancestors);
7400 -- Parent is not the name of an instantiation
7402 Install_Noninstance_Specs (Inst_Par);
7414 if Present (First_Gen) then
7415 Append_Elmt (First_Par, Ancestors);
7418 Install_Noninstance_Specs (First_Par);
7421 if not Is_Empty_Elmt_List (Ancestors) then
7422 Elmt := First_Elmt (Ancestors);
7424 while Present (Elmt) loop
7425 Install_Spec (Node (Elmt));
7426 Install_Formal_Packages (Node (Elmt));
7437 --------------------------------
7438 -- Instantiate_Formal_Package --
7439 --------------------------------
7441 function Instantiate_Formal_Package
7444 Analyzed_Formal : Node_Id) return List_Id
7446 Loc : constant Source_Ptr := Sloc (Actual);
7447 Actual_Pack : Entity_Id;
7448 Formal_Pack : Entity_Id;
7449 Gen_Parent : Entity_Id;
7452 Parent_Spec : Node_Id;
7454 procedure Find_Matching_Actual
7456 Act : in out Entity_Id);
7457 -- We need to associate each formal entity in the formal package
7458 -- with the corresponding entity in the actual package. The actual
7459 -- package has been analyzed and possibly expanded, and as a result
7460 -- there is no one-to-one correspondence between the two lists (for
7461 -- example, the actual may include subtypes, itypes, and inherited
7462 -- primitive operations, interspersed among the renaming declarations
7463 -- for the actuals) . We retrieve the corresponding actual by name
7464 -- because each actual has the same name as the formal, and they do
7465 -- appear in the same order.
7467 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7468 -- Retrieve entity of defining entity of generic formal parameter.
7469 -- Only the declarations of formals need to be considered when
7470 -- linking them to actuals, but the declarative list may include
7471 -- internal entities generated during analysis, and those are ignored.
7473 procedure Match_Formal_Entity
7474 (Formal_Node : Node_Id;
7475 Formal_Ent : Entity_Id;
7476 Actual_Ent : Entity_Id);
7477 -- Associates the formal entity with the actual. In the case
7478 -- where Formal_Ent is a formal package, this procedure iterates
7479 -- through all of its formals and enters associations between the
7480 -- actuals occurring in the formal package's corresponding actual
7481 -- package (given by Actual_Ent) and the formal package's formal
7482 -- parameters. This procedure recurses if any of the parameters is
7483 -- itself a package.
7485 function Is_Instance_Of
7486 (Act_Spec : Entity_Id;
7487 Gen_Anc : Entity_Id) return Boolean;
7488 -- The actual can be an instantiation of a generic within another
7489 -- instance, in which case there is no direct link from it to the
7490 -- original generic ancestor. In that case, we recognize that the
7491 -- ultimate ancestor is the same by examining names and scopes.
7493 procedure Process_Nested_Formal (Formal : Entity_Id);
7494 -- If the current formal is declared with a box, its own formals are
7495 -- visible in the instance, as they were in the generic, and their
7496 -- Hidden flag must be reset. If some of these formals are themselves
7497 -- packages declared with a box, the processing must be recursive.
7499 --------------------------
7500 -- Find_Matching_Actual --
7501 --------------------------
7503 procedure Find_Matching_Actual
7505 Act : in out Entity_Id)
7507 Formal_Ent : Entity_Id;
7510 case Nkind (Original_Node (F)) is
7511 when N_Formal_Object_Declaration |
7512 N_Formal_Type_Declaration =>
7513 Formal_Ent := Defining_Identifier (F);
7515 while Chars (Act) /= Chars (Formal_Ent) loop
7519 when N_Formal_Subprogram_Declaration |
7520 N_Formal_Package_Declaration |
7521 N_Package_Declaration |
7522 N_Generic_Package_Declaration =>
7523 Formal_Ent := Defining_Entity (F);
7525 while Chars (Act) /= Chars (Formal_Ent) loop
7530 raise Program_Error;
7532 end Find_Matching_Actual;
7534 -------------------------
7535 -- Match_Formal_Entity --
7536 -------------------------
7538 procedure Match_Formal_Entity
7539 (Formal_Node : Node_Id;
7540 Formal_Ent : Entity_Id;
7541 Actual_Ent : Entity_Id)
7543 Act_Pkg : Entity_Id;
7546 Set_Instance_Of (Formal_Ent, Actual_Ent);
7548 if Ekind (Actual_Ent) = E_Package then
7550 -- Record associations for each parameter
7552 Act_Pkg := Actual_Ent;
7555 A_Ent : Entity_Id := First_Entity (Act_Pkg);
7564 -- Retrieve the actual given in the formal package declaration
7566 Actual := Entity (Name (Original_Node (Formal_Node)));
7568 -- The actual in the formal package declaration may be a
7569 -- renamed generic package, in which case we want to retrieve
7570 -- the original generic in order to traverse its formal part.
7572 if Present (Renamed_Entity (Actual)) then
7573 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
7575 Gen_Decl := Unit_Declaration_Node (Actual);
7578 Formals := Generic_Formal_Declarations (Gen_Decl);
7580 if Present (Formals) then
7581 F_Node := First_Non_Pragma (Formals);
7586 while Present (A_Ent)
7587 and then Present (F_Node)
7588 and then A_Ent /= First_Private_Entity (Act_Pkg)
7590 F_Ent := Get_Formal_Entity (F_Node);
7592 if Present (F_Ent) then
7594 -- This is a formal of the original package. Record
7595 -- association and recurse.
7597 Find_Matching_Actual (F_Node, A_Ent);
7598 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
7599 Next_Entity (A_Ent);
7602 Next_Non_Pragma (F_Node);
7606 end Match_Formal_Entity;
7608 -----------------------
7609 -- Get_Formal_Entity --
7610 -----------------------
7612 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
7613 Kind : constant Node_Kind := Nkind (Original_Node (N));
7616 when N_Formal_Object_Declaration =>
7617 return Defining_Identifier (N);
7619 when N_Formal_Type_Declaration =>
7620 return Defining_Identifier (N);
7622 when N_Formal_Subprogram_Declaration =>
7623 return Defining_Unit_Name (Specification (N));
7625 when N_Formal_Package_Declaration =>
7626 return Defining_Identifier (Original_Node (N));
7628 when N_Generic_Package_Declaration =>
7629 return Defining_Identifier (Original_Node (N));
7631 -- All other declarations are introduced by semantic analysis and
7632 -- have no match in the actual.
7637 end Get_Formal_Entity;
7639 --------------------
7640 -- Is_Instance_Of --
7641 --------------------
7643 function Is_Instance_Of
7644 (Act_Spec : Entity_Id;
7645 Gen_Anc : Entity_Id) return Boolean
7647 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
7650 if No (Gen_Par) then
7653 -- Simplest case: the generic parent of the actual is the formal
7655 elsif Gen_Par = Gen_Anc then
7658 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
7661 -- The actual may be obtained through several instantiations. Its
7662 -- scope must itself be an instance of a generic declared in the
7663 -- same scope as the formal. Any other case is detected above.
7665 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
7669 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
7673 ---------------------------
7674 -- Process_Nested_Formal --
7675 ---------------------------
7677 procedure Process_Nested_Formal (Formal : Entity_Id) is
7681 if Present (Associated_Formal_Package (Formal))
7682 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
7684 Ent := First_Entity (Formal);
7685 while Present (Ent) loop
7686 Set_Is_Hidden (Ent, False);
7687 Set_Is_Visible_Formal (Ent);
7688 Set_Is_Potentially_Use_Visible
7689 (Ent, Is_Potentially_Use_Visible (Formal));
7691 if Ekind (Ent) = E_Package then
7692 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
7693 Process_Nested_Formal (Ent);
7699 end Process_Nested_Formal;
7701 -- Start of processing for Instantiate_Formal_Package
7706 if not Is_Entity_Name (Actual)
7707 or else Ekind (Entity (Actual)) /= E_Package
7710 ("expect package instance to instantiate formal", Actual);
7711 Abandon_Instantiation (Actual);
7712 raise Program_Error;
7715 Actual_Pack := Entity (Actual);
7716 Set_Is_Instantiated (Actual_Pack);
7718 -- The actual may be a renamed package, or an outer generic formal
7719 -- package whose instantiation is converted into a renaming.
7721 if Present (Renamed_Object (Actual_Pack)) then
7722 Actual_Pack := Renamed_Object (Actual_Pack);
7725 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
7726 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
7727 Formal_Pack := Defining_Identifier (Analyzed_Formal);
7730 Generic_Parent (Specification (Analyzed_Formal));
7732 Defining_Unit_Name (Specification (Analyzed_Formal));
7735 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
7736 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
7738 Parent_Spec := Parent (Actual_Pack);
7741 if Gen_Parent = Any_Id then
7743 ("previous error in declaration of formal package", Actual);
7744 Abandon_Instantiation (Actual);
7747 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
7753 ("actual parameter must be instance of&", Actual, Gen_Parent);
7754 Abandon_Instantiation (Actual);
7757 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
7758 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
7761 Make_Package_Renaming_Declaration (Loc,
7762 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
7763 Name => New_Reference_To (Actual_Pack, Loc));
7765 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
7766 Defining_Identifier (Formal));
7767 Decls := New_List (Nod);
7769 -- If the formal F has a box, then the generic declarations are
7770 -- visible in the generic G. In an instance of G, the corresponding
7771 -- entities in the actual for F (which are the actuals for the
7772 -- instantiation of the generic that F denotes) must also be made
7773 -- visible for analysis of the current instance. On exit from the
7774 -- current instance, those entities are made private again. If the
7775 -- actual is currently in use, these entities are also use-visible.
7777 -- The loop through the actual entities also steps through the formal
7778 -- entities and enters associations from formals to actuals into the
7779 -- renaming map. This is necessary to properly handle checking of
7780 -- actual parameter associations for later formals that depend on
7781 -- actuals declared in the formal package.
7783 -- In Ada 2005, partial parametrization requires that we make visible
7784 -- the actuals corresponding to formals that were defaulted in the
7785 -- formal package. There formals are identified because they remain
7786 -- formal generics within the formal package, rather than being
7787 -- renamings of the actuals supplied.
7790 Gen_Decl : constant Node_Id :=
7791 Unit_Declaration_Node (Gen_Parent);
7792 Formals : constant List_Id :=
7793 Generic_Formal_Declarations (Gen_Decl);
7795 Actual_Ent : Entity_Id;
7796 Actual_Of_Formal : Node_Id;
7797 Formal_Node : Node_Id;
7798 Formal_Ent : Entity_Id;
7801 if Present (Formals) then
7802 Formal_Node := First_Non_Pragma (Formals);
7804 Formal_Node := Empty;
7807 Actual_Ent := First_Entity (Actual_Pack);
7809 First (Visible_Declarations (Specification (Analyzed_Formal)));
7810 while Present (Actual_Ent)
7811 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7813 if Present (Formal_Node) then
7814 Formal_Ent := Get_Formal_Entity (Formal_Node);
7816 if Present (Formal_Ent) then
7817 Find_Matching_Actual (Formal_Node, Actual_Ent);
7819 (Formal_Node, Formal_Ent, Actual_Ent);
7821 -- We iterate at the same time over the actuals of the
7822 -- local package created for the formal, to determine
7823 -- which one of the formals of the original generic were
7824 -- defaulted in the formal. The corresponding actual
7825 -- entities are visible in the enclosing instance.
7827 if Box_Present (Formal)
7829 (Present (Actual_Of_Formal)
7832 (Get_Formal_Entity (Actual_Of_Formal)))
7834 Set_Is_Hidden (Actual_Ent, False);
7835 Set_Is_Visible_Formal (Actual_Ent);
7836 Set_Is_Potentially_Use_Visible
7837 (Actual_Ent, In_Use (Actual_Pack));
7839 if Ekind (Actual_Ent) = E_Package then
7840 Process_Nested_Formal (Actual_Ent);
7844 Set_Is_Hidden (Actual_Ent);
7845 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
7849 Next_Non_Pragma (Formal_Node);
7850 Next (Actual_Of_Formal);
7853 -- No further formals to match, but the generic part may
7854 -- contain inherited operation that are not hidden in the
7855 -- enclosing instance.
7857 Next_Entity (Actual_Ent);
7861 -- Inherited subprograms generated by formal derived types are
7862 -- also visible if the types are.
7864 Actual_Ent := First_Entity (Actual_Pack);
7865 while Present (Actual_Ent)
7866 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7868 if Is_Overloadable (Actual_Ent)
7870 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
7872 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
7874 Set_Is_Hidden (Actual_Ent, False);
7875 Set_Is_Potentially_Use_Visible
7876 (Actual_Ent, In_Use (Actual_Pack));
7879 Next_Entity (Actual_Ent);
7883 -- If the formal is not declared with a box, reanalyze it as an
7884 -- abbreviated instantiation, to verify the matching rules of 12.7.
7885 -- The actual checks are performed after the generic associations
7886 -- have been analyzed, to guarantee the same visibility for this
7887 -- instantiation and for the actuals.
7889 -- In Ada 2005, the generic associations for the formal can include
7890 -- defaulted parameters. These are ignored during check. This
7891 -- internal instantiation is removed from the tree after conformance
7892 -- checking, because it contains formal declarations for those
7893 -- defaulted parameters, and those should not reach the back-end.
7895 if not Box_Present (Formal) then
7897 I_Pack : constant Entity_Id :=
7898 Make_Temporary (Sloc (Actual), 'P');
7901 Set_Is_Internal (I_Pack);
7904 Make_Package_Instantiation (Sloc (Actual),
7905 Defining_Unit_Name => I_Pack,
7908 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
7909 Generic_Associations =>
7910 Generic_Associations (Formal)));
7916 end Instantiate_Formal_Package;
7918 -----------------------------------
7919 -- Instantiate_Formal_Subprogram --
7920 -----------------------------------
7922 function Instantiate_Formal_Subprogram
7925 Analyzed_Formal : Node_Id) return Node_Id
7928 Formal_Sub : constant Entity_Id :=
7929 Defining_Unit_Name (Specification (Formal));
7930 Analyzed_S : constant Entity_Id :=
7931 Defining_Unit_Name (Specification (Analyzed_Formal));
7932 Decl_Node : Node_Id;
7936 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
7937 -- If the generic is a child unit, the parent has been installed on the
7938 -- scope stack, but a default subprogram cannot resolve to something on
7939 -- the parent because that parent is not really part of the visible
7940 -- context (it is there to resolve explicit local entities). If the
7941 -- default has resolved in this way, we remove the entity from
7942 -- immediate visibility and analyze the node again to emit an error
7943 -- message or find another visible candidate.
7945 procedure Valid_Actual_Subprogram (Act : Node_Id);
7946 -- Perform legality check and raise exception on failure
7948 -----------------------
7949 -- From_Parent_Scope --
7950 -----------------------
7952 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
7953 Gen_Scope : Node_Id;
7956 Gen_Scope := Scope (Analyzed_S);
7957 while Present (Gen_Scope)
7958 and then Is_Child_Unit (Gen_Scope)
7960 if Scope (Subp) = Scope (Gen_Scope) then
7964 Gen_Scope := Scope (Gen_Scope);
7968 end From_Parent_Scope;
7970 -----------------------------
7971 -- Valid_Actual_Subprogram --
7972 -----------------------------
7974 procedure Valid_Actual_Subprogram (Act : Node_Id) is
7978 if Is_Entity_Name (Act) then
7979 Act_E := Entity (Act);
7981 elsif Nkind (Act) = N_Selected_Component
7982 and then Is_Entity_Name (Selector_Name (Act))
7984 Act_E := Entity (Selector_Name (Act));
7990 if (Present (Act_E) and then Is_Overloadable (Act_E))
7991 or else Nkind_In (Act, N_Attribute_Reference,
7992 N_Indexed_Component,
7993 N_Character_Literal,
7994 N_Explicit_Dereference)
8000 ("expect subprogram or entry name in instantiation of&",
8001 Instantiation_Node, Formal_Sub);
8002 Abandon_Instantiation (Instantiation_Node);
8004 end Valid_Actual_Subprogram;
8006 -- Start of processing for Instantiate_Formal_Subprogram
8009 New_Spec := New_Copy_Tree (Specification (Formal));
8011 -- The tree copy has created the proper instantiation sloc for the
8012 -- new specification. Use this location for all other constructed
8015 Loc := Sloc (Defining_Unit_Name (New_Spec));
8017 -- Create new entity for the actual (New_Copy_Tree does not)
8019 Set_Defining_Unit_Name
8020 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8022 -- Create new entities for the each of the formals in the
8023 -- specification of the renaming declaration built for the actual.
8025 if Present (Parameter_Specifications (New_Spec)) then
8029 F := First (Parameter_Specifications (New_Spec));
8030 while Present (F) loop
8031 Set_Defining_Identifier (F,
8032 Make_Defining_Identifier (Sloc (F),
8033 Chars => Chars (Defining_Identifier (F))));
8039 -- Find entity of actual. If the actual is an attribute reference, it
8040 -- cannot be resolved here (its formal is missing) but is handled
8041 -- instead in Attribute_Renaming. If the actual is overloaded, it is
8042 -- fully resolved subsequently, when the renaming declaration for the
8043 -- formal is analyzed. If it is an explicit dereference, resolve the
8044 -- prefix but not the actual itself, to prevent interpretation as call.
8046 if Present (Actual) then
8047 Loc := Sloc (Actual);
8048 Set_Sloc (New_Spec, Loc);
8050 if Nkind (Actual) = N_Operator_Symbol then
8051 Find_Direct_Name (Actual);
8053 elsif Nkind (Actual) = N_Explicit_Dereference then
8054 Analyze (Prefix (Actual));
8056 elsif Nkind (Actual) /= N_Attribute_Reference then
8060 Valid_Actual_Subprogram (Actual);
8063 elsif Present (Default_Name (Formal)) then
8064 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
8065 N_Selected_Component,
8066 N_Indexed_Component,
8067 N_Character_Literal)
8068 and then Present (Entity (Default_Name (Formal)))
8070 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
8072 Nam := New_Copy (Default_Name (Formal));
8073 Set_Sloc (Nam, Loc);
8076 elsif Box_Present (Formal) then
8078 -- Actual is resolved at the point of instantiation. Create an
8079 -- identifier or operator with the same name as the formal.
8081 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
8082 Nam := Make_Operator_Symbol (Loc,
8083 Chars => Chars (Formal_Sub),
8084 Strval => No_String);
8086 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
8089 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
8090 and then Null_Present (Specification (Formal))
8092 -- Generate null body for procedure, for use in the instance
8095 Make_Subprogram_Body (Loc,
8096 Specification => New_Spec,
8097 Declarations => New_List,
8098 Handled_Statement_Sequence =>
8099 Make_Handled_Sequence_Of_Statements (Loc,
8100 Statements => New_List (Make_Null_Statement (Loc))));
8102 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
8106 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
8108 ("missing actual&", Instantiation_Node, Formal_Sub);
8110 ("\in instantiation of & declared#",
8111 Instantiation_Node, Scope (Analyzed_S));
8112 Abandon_Instantiation (Instantiation_Node);
8116 Make_Subprogram_Renaming_Declaration (Loc,
8117 Specification => New_Spec,
8120 -- If we do not have an actual and the formal specified <> then set to
8121 -- get proper default.
8123 if No (Actual) and then Box_Present (Formal) then
8124 Set_From_Default (Decl_Node);
8127 -- Gather possible interpretations for the actual before analyzing the
8128 -- instance. If overloaded, it will be resolved when analyzing the
8129 -- renaming declaration.
8131 if Box_Present (Formal)
8132 and then No (Actual)
8136 if Is_Child_Unit (Scope (Analyzed_S))
8137 and then Present (Entity (Nam))
8139 if not Is_Overloaded (Nam) then
8141 if From_Parent_Scope (Entity (Nam)) then
8142 Set_Is_Immediately_Visible (Entity (Nam), False);
8143 Set_Entity (Nam, Empty);
8144 Set_Etype (Nam, Empty);
8148 Set_Is_Immediately_Visible (Entity (Nam));
8157 Get_First_Interp (Nam, I, It);
8159 while Present (It.Nam) loop
8160 if From_Parent_Scope (It.Nam) then
8164 Get_Next_Interp (I, It);
8171 -- The generic instantiation freezes the actual. This can only be done
8172 -- once the actual is resolved, in the analysis of the renaming
8173 -- declaration. To make the formal subprogram entity available, we set
8174 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8175 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8176 -- of formal abstract subprograms.
8178 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
8180 -- We cannot analyze the renaming declaration, and thus find the actual,
8181 -- until all the actuals are assembled in the instance. For subsequent
8182 -- checks of other actuals, indicate the node that will hold the
8183 -- instance of this formal.
8185 Set_Instance_Of (Analyzed_S, Nam);
8187 if Nkind (Actual) = N_Selected_Component
8188 and then Is_Task_Type (Etype (Prefix (Actual)))
8189 and then not Is_Frozen (Etype (Prefix (Actual)))
8191 -- The renaming declaration will create a body, which must appear
8192 -- outside of the instantiation, We move the renaming declaration
8193 -- out of the instance, and create an additional renaming inside,
8194 -- to prevent freezing anomalies.
8197 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
8200 Set_Defining_Unit_Name (New_Spec, Anon_Id);
8201 Insert_Before (Instantiation_Node, Decl_Node);
8202 Analyze (Decl_Node);
8204 -- Now create renaming within the instance
8207 Make_Subprogram_Renaming_Declaration (Loc,
8208 Specification => New_Copy_Tree (New_Spec),
8209 Name => New_Occurrence_Of (Anon_Id, Loc));
8211 Set_Defining_Unit_Name (Specification (Decl_Node),
8212 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8217 end Instantiate_Formal_Subprogram;
8219 ------------------------
8220 -- Instantiate_Object --
8221 ------------------------
8223 function Instantiate_Object
8226 Analyzed_Formal : Node_Id) return List_Id
8228 Acc_Def : Node_Id := Empty;
8229 Act_Assoc : constant Node_Id := Parent (Actual);
8230 Actual_Decl : Node_Id := Empty;
8231 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
8232 Decl_Node : Node_Id;
8235 List : constant List_Id := New_List;
8236 Loc : constant Source_Ptr := Sloc (Actual);
8237 Orig_Ftyp : constant Entity_Id :=
8238 Etype (Defining_Identifier (Analyzed_Formal));
8239 Subt_Decl : Node_Id := Empty;
8240 Subt_Mark : Node_Id := Empty;
8243 if Present (Subtype_Mark (Formal)) then
8244 Subt_Mark := Subtype_Mark (Formal);
8246 Check_Access_Definition (Formal);
8247 Acc_Def := Access_Definition (Formal);
8250 -- Sloc for error message on missing actual
8252 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
8254 if Get_Instance_Of (Formal_Id) /= Formal_Id then
8255 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8258 Set_Parent (List, Parent (Actual));
8262 if Out_Present (Formal) then
8264 -- An IN OUT generic actual must be a name. The instantiation is a
8265 -- renaming declaration. The actual is the name being renamed. We
8266 -- use the actual directly, rather than a copy, because it is not
8267 -- used further in the list of actuals, and because a copy or a use
8268 -- of relocate_node is incorrect if the instance is nested within a
8269 -- generic. In order to simplify ASIS searches, the Generic_Parent
8270 -- field links the declaration to the generic association.
8275 Instantiation_Node, Formal_Id);
8277 ("\in instantiation of & declared#",
8279 Scope (Defining_Identifier (Analyzed_Formal)));
8280 Abandon_Instantiation (Instantiation_Node);
8283 if Present (Subt_Mark) then
8285 Make_Object_Renaming_Declaration (Loc,
8286 Defining_Identifier => New_Copy (Formal_Id),
8287 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8290 else pragma Assert (Present (Acc_Def));
8292 Make_Object_Renaming_Declaration (Loc,
8293 Defining_Identifier => New_Copy (Formal_Id),
8294 Access_Definition => New_Copy_Tree (Acc_Def),
8298 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8300 -- The analysis of the actual may produce insert_action nodes, so
8301 -- the declaration must have a context in which to attach them.
8303 Append (Decl_Node, List);
8306 -- Return if the analysis of the actual reported some error
8308 if Etype (Actual) = Any_Type then
8312 -- This check is performed here because Analyze_Object_Renaming will
8313 -- not check it when Comes_From_Source is False. Note though that the
8314 -- check for the actual being the name of an object will be performed
8315 -- in Analyze_Object_Renaming.
8317 if Is_Object_Reference (Actual)
8318 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8321 ("illegal discriminant-dependent component for in out parameter",
8325 -- The actual has to be resolved in order to check that it is a
8326 -- variable (due to cases such as F(1), where F returns
8327 -- access to an array, and for overloaded prefixes).
8330 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
8332 if Is_Private_Type (Ftyp)
8333 and then not Is_Private_Type (Etype (Actual))
8334 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8335 or else Base_Type (Etype (Actual)) = Ftyp)
8337 -- If the actual has the type of the full view of the formal, or
8338 -- else a non-private subtype of the formal, then the visibility
8339 -- of the formal type has changed. Add to the actuals a subtype
8340 -- declaration that will force the exchange of views in the body
8341 -- of the instance as well.
8344 Make_Subtype_Declaration (Loc,
8345 Defining_Identifier => Make_Temporary (Loc, 'P'),
8346 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8348 Prepend (Subt_Decl, List);
8350 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8351 Exchange_Declarations (Ftyp);
8354 Resolve (Actual, Ftyp);
8356 if not Denotes_Variable (Actual) then
8358 ("actual for& must be a variable", Actual, Formal_Id);
8360 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8362 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8363 -- the type of the actual shall resolve to a specific anonymous
8366 if Ada_Version < Ada_05
8368 Ekind (Base_Type (Ftyp)) /=
8369 E_Anonymous_Access_Type
8371 Ekind (Base_Type (Etype (Actual))) /=
8372 E_Anonymous_Access_Type
8374 Error_Msg_NE ("type of actual does not match type of&",
8379 Note_Possible_Modification (Actual, Sure => True);
8381 -- Check for instantiation of atomic/volatile actual for
8382 -- non-atomic/volatile formal (RM C.6 (12)).
8384 if Is_Atomic_Object (Actual)
8385 and then not Is_Atomic (Orig_Ftyp)
8388 ("cannot instantiate non-atomic formal object " &
8389 "with atomic actual", Actual);
8391 elsif Is_Volatile_Object (Actual)
8392 and then not Is_Volatile (Orig_Ftyp)
8395 ("cannot instantiate non-volatile formal object " &
8396 "with volatile actual", Actual);
8399 -- Formal in-parameter
8402 -- The instantiation of a generic formal in-parameter is constant
8403 -- declaration. The actual is the expression for that declaration.
8405 if Present (Actual) then
8406 if Present (Subt_Mark) then
8408 else pragma Assert (Present (Acc_Def));
8413 Make_Object_Declaration (Loc,
8414 Defining_Identifier => New_Copy (Formal_Id),
8415 Constant_Present => True,
8416 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8417 Object_Definition => New_Copy_Tree (Def),
8418 Expression => Actual);
8420 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8422 -- A generic formal object of a tagged type is defined to be
8423 -- aliased so the new constant must also be treated as aliased.
8426 (Etype (Defining_Identifier (Analyzed_Formal)))
8428 Set_Aliased_Present (Decl_Node);
8431 Append (Decl_Node, List);
8433 -- No need to repeat (pre-)analysis of some expression nodes
8434 -- already handled in Preanalyze_Actuals.
8436 if Nkind (Actual) /= N_Allocator then
8439 -- Return if the analysis of the actual reported some error
8441 if Etype (Actual) = Any_Type then
8447 Formal_Object : constant Entity_Id :=
8448 Defining_Identifier (Analyzed_Formal);
8449 Formal_Type : constant Entity_Id := Etype (Formal_Object);
8454 Typ := Get_Instance_Of (Formal_Type);
8456 Freeze_Before (Instantiation_Node, Typ);
8458 -- If the actual is an aggregate, perform name resolution on
8459 -- its components (the analysis of an aggregate does not do it)
8460 -- to capture local names that may be hidden if the generic is
8463 if Nkind (Actual) = N_Aggregate then
8464 Preanalyze_And_Resolve (Actual, Typ);
8467 if Is_Limited_Type (Typ)
8468 and then not OK_For_Limited_Init (Typ, Actual)
8471 ("initialization not allowed for limited types", Actual);
8472 Explain_Limited_Type (Typ, Actual);
8476 elsif Present (Default_Expression (Formal)) then
8478 -- Use default to construct declaration
8480 if Present (Subt_Mark) then
8482 else pragma Assert (Present (Acc_Def));
8487 Make_Object_Declaration (Sloc (Formal),
8488 Defining_Identifier => New_Copy (Formal_Id),
8489 Constant_Present => True,
8490 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8491 Object_Definition => New_Copy (Def),
8492 Expression => New_Copy_Tree
8493 (Default_Expression (Formal)));
8495 Append (Decl_Node, List);
8496 Set_Analyzed (Expression (Decl_Node), False);
8501 Instantiation_Node, Formal_Id);
8502 Error_Msg_NE ("\in instantiation of & declared#",
8504 Scope (Defining_Identifier (Analyzed_Formal)));
8507 (Etype (Defining_Identifier (Analyzed_Formal)))
8509 -- Create dummy constant declaration so that instance can be
8510 -- analyzed, to minimize cascaded visibility errors.
8512 if Present (Subt_Mark) then
8514 else pragma Assert (Present (Acc_Def));
8519 Make_Object_Declaration (Loc,
8520 Defining_Identifier => New_Copy (Formal_Id),
8521 Constant_Present => True,
8522 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
8523 Object_Definition => New_Copy (Def),
8525 Make_Attribute_Reference (Sloc (Formal_Id),
8526 Attribute_Name => Name_First,
8527 Prefix => New_Copy (Def)));
8529 Append (Decl_Node, List);
8532 Abandon_Instantiation (Instantiation_Node);
8537 if Nkind (Actual) in N_Has_Entity then
8538 Actual_Decl := Parent (Entity (Actual));
8541 -- Ada 2005 (AI-423): For a formal object declaration with a null
8542 -- exclusion or an access definition that has a null exclusion: If the
8543 -- actual matching the formal object declaration denotes a generic
8544 -- formal object of another generic unit G, and the instantiation
8545 -- containing the actual occurs within the body of G or within the body
8546 -- of a generic unit declared within the declarative region of G, then
8547 -- the declaration of the formal object of G must have a null exclusion.
8548 -- Otherwise, the subtype of the actual matching the formal object
8549 -- declaration shall exclude null.
8551 if Ada_Version >= Ada_05
8552 and then Present (Actual_Decl)
8554 Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
8555 N_Object_Declaration)
8556 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
8557 and then not Has_Null_Exclusion (Actual_Decl)
8558 and then Has_Null_Exclusion (Analyzed_Formal)
8560 Error_Msg_Sloc := Sloc (Analyzed_Formal);
8562 ("actual must exclude null to match generic formal#", Actual);
8566 end Instantiate_Object;
8568 ------------------------------
8569 -- Instantiate_Package_Body --
8570 ------------------------------
8572 procedure Instantiate_Package_Body
8573 (Body_Info : Pending_Body_Info;
8574 Inlined_Body : Boolean := False;
8575 Body_Optional : Boolean := False)
8577 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8578 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8579 Loc : constant Source_Ptr := Sloc (Inst_Node);
8581 Gen_Id : constant Node_Id := Name (Inst_Node);
8582 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8583 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8584 Act_Spec : constant Node_Id := Specification (Act_Decl);
8585 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
8587 Act_Body_Name : Node_Id;
8589 Gen_Body_Id : Node_Id;
8591 Act_Body_Id : Entity_Id;
8593 Parent_Installed : Boolean := False;
8594 Save_Style_Check : constant Boolean := Style_Check;
8596 Par_Ent : Entity_Id := Empty;
8597 Par_Vis : Boolean := False;
8600 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8602 -- The instance body may already have been processed, as the parent of
8603 -- another instance that is inlined (Load_Parent_Of_Generic).
8605 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
8609 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8611 -- Re-establish the state of information on which checks are suppressed.
8612 -- This information was set in Body_Info at the point of instantiation,
8613 -- and now we restore it so that the instance is compiled using the
8614 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8616 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8617 Scope_Suppress := Body_Info.Scope_Suppress;
8618 Opt.Ada_Version := Body_Info.Version;
8620 if No (Gen_Body_Id) then
8621 Load_Parent_Of_Generic
8622 (Inst_Node, Specification (Gen_Decl), Body_Optional);
8623 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8626 -- Establish global variable for sloc adjustment and for error recovery
8628 Instantiation_Node := Inst_Node;
8630 if Present (Gen_Body_Id) then
8631 Save_Env (Gen_Unit, Act_Decl_Id);
8632 Style_Check := False;
8633 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8635 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8637 Create_Instantiation_Source
8638 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
8642 (Original_Node (Gen_Body), Empty, Instantiating => True);
8644 -- Build new name (possibly qualified) for body declaration
8646 Act_Body_Id := New_Copy (Act_Decl_Id);
8648 -- Some attributes of spec entity are not inherited by body entity
8650 Set_Handler_Records (Act_Body_Id, No_List);
8652 if Nkind (Defining_Unit_Name (Act_Spec)) =
8653 N_Defining_Program_Unit_Name
8656 Make_Defining_Program_Unit_Name (Loc,
8657 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
8658 Defining_Identifier => Act_Body_Id);
8660 Act_Body_Name := Act_Body_Id;
8663 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
8665 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
8666 Check_Generic_Actuals (Act_Decl_Id, False);
8668 -- If it is a child unit, make the parent instance (which is an
8669 -- instance of the parent of the generic) visible. The parent
8670 -- instance is the prefix of the name of the generic unit.
8672 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8673 and then Nkind (Gen_Id) = N_Expanded_Name
8675 Par_Ent := Entity (Prefix (Gen_Id));
8676 Par_Vis := Is_Immediately_Visible (Par_Ent);
8677 Install_Parent (Par_Ent, In_Body => True);
8678 Parent_Installed := True;
8680 elsif Is_Child_Unit (Gen_Unit) then
8681 Par_Ent := Scope (Gen_Unit);
8682 Par_Vis := Is_Immediately_Visible (Par_Ent);
8683 Install_Parent (Par_Ent, In_Body => True);
8684 Parent_Installed := True;
8687 -- If the instantiation is a library unit, and this is the main unit,
8688 -- then build the resulting compilation unit nodes for the instance.
8689 -- If this is a compilation unit but it is not the main unit, then it
8690 -- is the body of a unit in the context, that is being compiled
8691 -- because it is encloses some inlined unit or another generic unit
8692 -- being instantiated. In that case, this body is not part of the
8693 -- current compilation, and is not attached to the tree, but its
8694 -- parent must be set for analysis.
8696 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8698 -- Replace instance node with body of instance, and create new
8699 -- node for corresponding instance declaration.
8701 Build_Instance_Compilation_Unit_Nodes
8702 (Inst_Node, Act_Body, Act_Decl);
8703 Analyze (Inst_Node);
8705 if Parent (Inst_Node) = Cunit (Main_Unit) then
8707 -- If the instance is a child unit itself, then set the scope
8708 -- of the expanded body to be the parent of the instantiation
8709 -- (ensuring that the fully qualified name will be generated
8710 -- for the elaboration subprogram).
8712 if Nkind (Defining_Unit_Name (Act_Spec)) =
8713 N_Defining_Program_Unit_Name
8716 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
8720 -- Case where instantiation is not a library unit
8723 -- If this is an early instantiation, i.e. appears textually
8724 -- before the corresponding body and must be elaborated first,
8725 -- indicate that the body instance is to be delayed.
8727 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
8729 -- Now analyze the body. We turn off all checks if this is an
8730 -- internal unit, since there is no reason to have checks on for
8731 -- any predefined run-time library code. All such code is designed
8732 -- to be compiled with checks off.
8734 -- Note that we do NOT apply this criterion to children of GNAT
8735 -- (or on VMS, children of DEC). The latter units must suppress
8736 -- checks explicitly if this is needed.
8738 if Is_Predefined_File_Name
8739 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
8741 Analyze (Act_Body, Suppress => All_Checks);
8747 Inherit_Context (Gen_Body, Inst_Node);
8749 -- Remove the parent instances if they have been placed on the scope
8750 -- stack to compile the body.
8752 if Parent_Installed then
8753 Remove_Parent (In_Body => True);
8755 -- Restore the previous visibility of the parent
8757 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
8760 Restore_Private_Views (Act_Decl_Id);
8762 -- Remove the current unit from visibility if this is an instance
8763 -- that is not elaborated on the fly for inlining purposes.
8765 if not Inlined_Body then
8766 Set_Is_Immediately_Visible (Act_Decl_Id, False);
8770 Style_Check := Save_Style_Check;
8772 -- If we have no body, and the unit requires a body, then complain. This
8773 -- complaint is suppressed if we have detected other errors (since a
8774 -- common reason for missing the body is that it had errors).
8775 -- In CodePeer mode, a warning has been emitted already, no need for
8776 -- further messages.
8778 elsif Unit_Requires_Body (Gen_Unit)
8779 and then not Body_Optional
8781 if CodePeer_Mode then
8784 elsif Serious_Errors_Detected = 0 then
8786 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
8788 -- Don't attempt to perform any cleanup actions if some other error
8789 -- was already detected, since this can cause blowups.
8795 -- Case of package that does not need a body
8798 -- If the instantiation of the declaration is a library unit, rewrite
8799 -- the original package instantiation as a package declaration in the
8800 -- compilation unit node.
8802 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8803 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
8804 Rewrite (Inst_Node, Act_Decl);
8806 -- Generate elaboration entity, in case spec has elaboration code.
8807 -- This cannot be done when the instance is analyzed, because it
8808 -- is not known yet whether the body exists.
8810 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
8811 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
8813 -- If the instantiation is not a library unit, then append the
8814 -- declaration to the list of implicitly generated entities, unless
8815 -- it is already a list member which means that it was already
8818 elsif not Is_List_Member (Act_Decl) then
8819 Mark_Rewrite_Insertion (Act_Decl);
8820 Insert_Before (Inst_Node, Act_Decl);
8824 Expander_Mode_Restore;
8825 end Instantiate_Package_Body;
8827 ---------------------------------
8828 -- Instantiate_Subprogram_Body --
8829 ---------------------------------
8831 procedure Instantiate_Subprogram_Body
8832 (Body_Info : Pending_Body_Info;
8833 Body_Optional : Boolean := False)
8835 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8836 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8837 Loc : constant Source_Ptr := Sloc (Inst_Node);
8838 Gen_Id : constant Node_Id := Name (Inst_Node);
8839 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8840 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8841 Anon_Id : constant Entity_Id :=
8842 Defining_Unit_Name (Specification (Act_Decl));
8843 Pack_Id : constant Entity_Id :=
8844 Defining_Unit_Name (Parent (Act_Decl));
8847 Gen_Body_Id : Node_Id;
8849 Pack_Body : Node_Id;
8850 Prev_Formal : Entity_Id;
8852 Unit_Renaming : Node_Id;
8854 Parent_Installed : Boolean := False;
8855 Save_Style_Check : constant Boolean := Style_Check;
8857 Par_Ent : Entity_Id := Empty;
8858 Par_Vis : Boolean := False;
8861 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8863 -- Subprogram body may have been created already because of an inline
8864 -- pragma, or because of multiple elaborations of the enclosing package
8865 -- when several instances of the subprogram appear in the main unit.
8867 if Present (Corresponding_Body (Act_Decl)) then
8871 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8873 -- Re-establish the state of information on which checks are suppressed.
8874 -- This information was set in Body_Info at the point of instantiation,
8875 -- and now we restore it so that the instance is compiled using the
8876 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8878 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8879 Scope_Suppress := Body_Info.Scope_Suppress;
8880 Opt.Ada_Version := Body_Info.Version;
8882 if No (Gen_Body_Id) then
8884 -- For imported generic subprogram, no body to compile, complete
8885 -- the spec entity appropriately.
8887 if Is_Imported (Gen_Unit) then
8888 Set_Is_Imported (Anon_Id);
8889 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit));
8890 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit));
8891 Set_Convention (Anon_Id, Convention (Gen_Unit));
8892 Set_Has_Completion (Anon_Id);
8895 -- For other cases, compile the body
8898 Load_Parent_Of_Generic
8899 (Inst_Node, Specification (Gen_Decl), Body_Optional);
8900 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8904 Instantiation_Node := Inst_Node;
8906 if Present (Gen_Body_Id) then
8907 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8909 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
8911 -- Either body is not present, or context is non-expanding, as
8912 -- when compiling a subunit. Mark the instance as completed, and
8913 -- diagnose a missing body when needed.
8916 and then Operating_Mode = Generate_Code
8919 ("missing proper body for instantiation", Gen_Body);
8922 Set_Has_Completion (Anon_Id);
8926 Save_Env (Gen_Unit, Anon_Id);
8927 Style_Check := False;
8928 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8929 Create_Instantiation_Source
8937 (Original_Node (Gen_Body), Empty, Instantiating => True);
8939 -- Create proper defining name for the body, to correspond to
8940 -- the one in the spec.
8942 Set_Defining_Unit_Name (Specification (Act_Body),
8943 Make_Defining_Identifier
8944 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
8945 Set_Corresponding_Spec (Act_Body, Anon_Id);
8946 Set_Has_Completion (Anon_Id);
8947 Check_Generic_Actuals (Pack_Id, False);
8949 -- Generate a reference to link the visible subprogram instance to
8950 -- the generic body, which for navigation purposes is the only
8951 -- available source for the instance.
8954 (Related_Instance (Pack_Id),
8955 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
8957 -- If it is a child unit, make the parent instance (which is an
8958 -- instance of the parent of the generic) visible. The parent
8959 -- instance is the prefix of the name of the generic unit.
8961 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8962 and then Nkind (Gen_Id) = N_Expanded_Name
8964 Par_Ent := Entity (Prefix (Gen_Id));
8965 Par_Vis := Is_Immediately_Visible (Par_Ent);
8966 Install_Parent (Par_Ent, In_Body => True);
8967 Parent_Installed := True;
8969 elsif Is_Child_Unit (Gen_Unit) then
8970 Par_Ent := Scope (Gen_Unit);
8971 Par_Vis := Is_Immediately_Visible (Par_Ent);
8972 Install_Parent (Par_Ent, In_Body => True);
8973 Parent_Installed := True;
8976 -- Inside its body, a reference to the generic unit is a reference
8977 -- to the instance. The corresponding renaming is the first
8978 -- declaration in the body.
8981 Make_Subprogram_Renaming_Declaration (Loc,
8984 Specification (Original_Node (Gen_Body)),
8986 Instantiating => True),
8987 Name => New_Occurrence_Of (Anon_Id, Loc));
8989 -- If there is a formal subprogram with the same name as the unit
8990 -- itself, do not add this renaming declaration. This is a temporary
8991 -- fix for one ACVC test. ???
8993 Prev_Formal := First_Entity (Pack_Id);
8994 while Present (Prev_Formal) loop
8995 if Chars (Prev_Formal) = Chars (Gen_Unit)
8996 and then Is_Overloadable (Prev_Formal)
9001 Next_Entity (Prev_Formal);
9004 if Present (Prev_Formal) then
9005 Decls := New_List (Act_Body);
9007 Decls := New_List (Unit_Renaming, Act_Body);
9010 -- The subprogram body is placed in the body of a dummy package body,
9011 -- whose spec contains the subprogram declaration as well as the
9012 -- renaming declarations for the generic parameters.
9014 Pack_Body := Make_Package_Body (Loc,
9015 Defining_Unit_Name => New_Copy (Pack_Id),
9016 Declarations => Decls);
9018 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9020 -- If the instantiation is a library unit, then build resulting
9021 -- compilation unit nodes for the instance. The declaration of
9022 -- the enclosing package is the grandparent of the subprogram
9023 -- declaration. First replace the instantiation node as the unit
9024 -- of the corresponding compilation.
9026 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
9027 if Parent (Inst_Node) = Cunit (Main_Unit) then
9028 Set_Unit (Parent (Inst_Node), Inst_Node);
9029 Build_Instance_Compilation_Unit_Nodes
9030 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
9031 Analyze (Inst_Node);
9033 Set_Parent (Pack_Body, Parent (Inst_Node));
9034 Analyze (Pack_Body);
9038 Insert_Before (Inst_Node, Pack_Body);
9039 Mark_Rewrite_Insertion (Pack_Body);
9040 Analyze (Pack_Body);
9042 if Expander_Active then
9043 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
9047 Inherit_Context (Gen_Body, Inst_Node);
9049 Restore_Private_Views (Pack_Id, False);
9051 if Parent_Installed then
9052 Remove_Parent (In_Body => True);
9054 -- Restore the previous visibility of the parent
9056 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
9060 Style_Check := Save_Style_Check;
9062 -- Body not found. Error was emitted already. If there were no previous
9063 -- errors, this may be an instance whose scope is a premature instance.
9064 -- In that case we must insure that the (legal) program does raise
9065 -- program error if executed. We generate a subprogram body for this
9066 -- purpose. See DEC ac30vso.
9068 -- Should not reference proprietary DEC tests in comments ???
9070 elsif Serious_Errors_Detected = 0
9071 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
9073 if Body_Optional then
9076 elsif Ekind (Anon_Id) = E_Procedure then
9078 Make_Subprogram_Body (Loc,
9080 Make_Procedure_Specification (Loc,
9081 Defining_Unit_Name =>
9082 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9083 Parameter_Specifications =>
9085 (Parameter_Specifications (Parent (Anon_Id)))),
9087 Declarations => Empty_List,
9088 Handled_Statement_Sequence =>
9089 Make_Handled_Sequence_Of_Statements (Loc,
9092 Make_Raise_Program_Error (Loc,
9094 PE_Access_Before_Elaboration))));
9098 Make_Raise_Program_Error (Loc,
9099 Reason => PE_Access_Before_Elaboration);
9101 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
9102 Set_Analyzed (Ret_Expr);
9105 Make_Subprogram_Body (Loc,
9107 Make_Function_Specification (Loc,
9108 Defining_Unit_Name =>
9109 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
9110 Parameter_Specifications =>
9112 (Parameter_Specifications (Parent (Anon_Id))),
9113 Result_Definition =>
9114 New_Occurrence_Of (Etype (Anon_Id), Loc)),
9116 Declarations => Empty_List,
9117 Handled_Statement_Sequence =>
9118 Make_Handled_Sequence_Of_Statements (Loc,
9121 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
9124 Pack_Body := Make_Package_Body (Loc,
9125 Defining_Unit_Name => New_Copy (Pack_Id),
9126 Declarations => New_List (Act_Body));
9128 Insert_After (Inst_Node, Pack_Body);
9129 Set_Corresponding_Spec (Pack_Body, Pack_Id);
9130 Analyze (Pack_Body);
9133 Expander_Mode_Restore;
9134 end Instantiate_Subprogram_Body;
9136 ----------------------
9137 -- Instantiate_Type --
9138 ----------------------
9140 function Instantiate_Type
9143 Analyzed_Formal : Node_Id;
9144 Actual_Decls : List_Id) return List_Id
9146 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
9147 A_Gen_T : constant Entity_Id :=
9148 Defining_Identifier (Analyzed_Formal);
9149 Ancestor : Entity_Id := Empty;
9150 Def : constant Node_Id := Formal_Type_Definition (Formal);
9152 Decl_Node : Node_Id;
9153 Decl_Nodes : List_Id;
9157 procedure Validate_Array_Type_Instance;
9158 procedure Validate_Access_Subprogram_Instance;
9159 procedure Validate_Access_Type_Instance;
9160 procedure Validate_Derived_Type_Instance;
9161 procedure Validate_Derived_Interface_Type_Instance;
9162 procedure Validate_Interface_Type_Instance;
9163 procedure Validate_Private_Type_Instance;
9164 -- These procedures perform validation tests for the named case
9166 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
9167 -- Check that base types are the same and that the subtypes match
9168 -- statically. Used in several of the above.
9170 --------------------
9171 -- Subtypes_Match --
9172 --------------------
9174 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
9175 T : constant Entity_Id := Get_Instance_Of (Gen_T);
9178 return (Base_Type (T) = Base_Type (Act_T)
9179 and then Subtypes_Statically_Match (T, Act_T))
9181 or else (Is_Class_Wide_Type (Gen_T)
9182 and then Is_Class_Wide_Type (Act_T)
9185 (Get_Instance_Of (Root_Type (Gen_T)),
9189 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
9190 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
9191 and then Ekind (Act_T) = Ekind (Gen_T)
9193 Subtypes_Statically_Match
9194 (Designated_Type (Gen_T), Designated_Type (Act_T)));
9197 -----------------------------------------
9198 -- Validate_Access_Subprogram_Instance --
9199 -----------------------------------------
9201 procedure Validate_Access_Subprogram_Instance is
9203 if not Is_Access_Type (Act_T)
9204 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
9207 ("expect access type in instantiation of &", Actual, Gen_T);
9208 Abandon_Instantiation (Actual);
9211 Check_Mode_Conformant
9212 (Designated_Type (Act_T),
9213 Designated_Type (A_Gen_T),
9217 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
9218 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
9220 ("protected access type not allowed for formal &",
9224 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
9226 ("expect protected access type for formal &",
9229 end Validate_Access_Subprogram_Instance;
9231 -----------------------------------
9232 -- Validate_Access_Type_Instance --
9233 -----------------------------------
9235 procedure Validate_Access_Type_Instance is
9236 Desig_Type : constant Entity_Id :=
9237 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
9238 Desig_Act : Entity_Id;
9241 if not Is_Access_Type (Act_T) then
9243 ("expect access type in instantiation of &", Actual, Gen_T);
9244 Abandon_Instantiation (Actual);
9247 if Is_Access_Constant (A_Gen_T) then
9248 if not Is_Access_Constant (Act_T) then
9250 ("actual type must be access-to-constant type", Actual);
9251 Abandon_Instantiation (Actual);
9254 if Is_Access_Constant (Act_T) then
9256 ("actual type must be access-to-variable type", Actual);
9257 Abandon_Instantiation (Actual);
9259 elsif Ekind (A_Gen_T) = E_General_Access_Type
9260 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
9262 Error_Msg_N -- CODEFIX
9263 ("actual must be general access type!", Actual);
9264 Error_Msg_NE -- CODEFIX
9265 ("add ALL to }!", Actual, Act_T);
9266 Abandon_Instantiation (Actual);
9270 -- The designated subtypes, that is to say the subtypes introduced
9271 -- by an access type declaration (and not by a subtype declaration)
9274 Desig_Act := Designated_Type (Base_Type (Act_T));
9276 -- The designated type may have been introduced through a limited_
9277 -- with clause, in which case retrieve the non-limited view. This
9278 -- applies to incomplete types as well as to class-wide types.
9280 if From_With_Type (Desig_Act) then
9281 Desig_Act := Available_View (Desig_Act);
9284 if not Subtypes_Match
9285 (Desig_Type, Desig_Act) then
9287 ("designated type of actual does not match that of formal &",
9289 Abandon_Instantiation (Actual);
9291 elsif Is_Access_Type (Designated_Type (Act_T))
9292 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
9294 Is_Constrained (Designated_Type (Desig_Type))
9297 ("designated type of actual does not match that of formal &",
9299 Abandon_Instantiation (Actual);
9302 -- Ada 2005: null-exclusion indicators of the two types must agree
9304 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
9306 ("non null exclusion of actual and formal & do not match",
9309 end Validate_Access_Type_Instance;
9311 ----------------------------------
9312 -- Validate_Array_Type_Instance --
9313 ----------------------------------
9315 procedure Validate_Array_Type_Instance is
9320 function Formal_Dimensions return Int;
9321 -- Count number of dimensions in array type formal
9323 -----------------------
9324 -- Formal_Dimensions --
9325 -----------------------
9327 function Formal_Dimensions return Int is
9332 if Nkind (Def) = N_Constrained_Array_Definition then
9333 Index := First (Discrete_Subtype_Definitions (Def));
9335 Index := First (Subtype_Marks (Def));
9338 while Present (Index) loop
9344 end Formal_Dimensions;
9346 -- Start of processing for Validate_Array_Type_Instance
9349 if not Is_Array_Type (Act_T) then
9351 ("expect array type in instantiation of &", Actual, Gen_T);
9352 Abandon_Instantiation (Actual);
9354 elsif Nkind (Def) = N_Constrained_Array_Definition then
9355 if not (Is_Constrained (Act_T)) then
9357 ("expect constrained array in instantiation of &",
9359 Abandon_Instantiation (Actual);
9363 if Is_Constrained (Act_T) then
9365 ("expect unconstrained array in instantiation of &",
9367 Abandon_Instantiation (Actual);
9371 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9373 ("dimensions of actual do not match formal &", Actual, Gen_T);
9374 Abandon_Instantiation (Actual);
9377 I1 := First_Index (A_Gen_T);
9378 I2 := First_Index (Act_T);
9379 for J in 1 .. Formal_Dimensions loop
9381 -- If the indices of the actual were given by a subtype_mark,
9382 -- the index was transformed into a range attribute. Retrieve
9383 -- the original type mark for checking.
9385 if Is_Entity_Name (Original_Node (I2)) then
9386 T2 := Entity (Original_Node (I2));
9391 if not Subtypes_Match
9392 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
9395 ("index types of actual do not match those of formal &",
9397 Abandon_Instantiation (Actual);
9404 -- Check matching subtypes. Note that there are complex visibility
9405 -- issues when the generic is a child unit and some aspect of the
9406 -- generic type is declared in a parent unit of the generic. We do
9407 -- the test to handle this special case only after a direct check
9408 -- for static matching has failed.
9411 (Component_Type (A_Gen_T), Component_Type (Act_T))
9412 or else Subtypes_Match
9413 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
9414 Component_Type (Act_T))
9419 ("component subtype of actual does not match that of formal &",
9421 Abandon_Instantiation (Actual);
9424 if Has_Aliased_Components (A_Gen_T)
9425 and then not Has_Aliased_Components (Act_T)
9428 ("actual must have aliased components to match formal type &",
9431 end Validate_Array_Type_Instance;
9433 -----------------------------------------------
9434 -- Validate_Derived_Interface_Type_Instance --
9435 -----------------------------------------------
9437 procedure Validate_Derived_Interface_Type_Instance is
9438 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9442 -- First apply interface instance checks
9444 Validate_Interface_Type_Instance;
9446 -- Verify that immediate parent interface is an ancestor of
9450 and then not Interface_Present_In_Ancestor (Act_T, Par)
9453 ("interface actual must include progenitor&", Actual, Par);
9456 -- Now verify that the actual includes all other ancestors of
9459 Elmt := First_Elmt (Interfaces (A_Gen_T));
9460 while Present (Elmt) loop
9461 if not Interface_Present_In_Ancestor
9462 (Act_T, Get_Instance_Of (Node (Elmt)))
9465 ("interface actual must include progenitor&",
9466 Actual, Node (Elmt));
9471 end Validate_Derived_Interface_Type_Instance;
9473 ------------------------------------
9474 -- Validate_Derived_Type_Instance --
9475 ------------------------------------
9477 procedure Validate_Derived_Type_Instance is
9478 Actual_Discr : Entity_Id;
9479 Ancestor_Discr : Entity_Id;
9482 -- If the parent type in the generic declaration is itself a previous
9483 -- formal type, then it is local to the generic and absent from the
9484 -- analyzed generic definition. In that case the ancestor is the
9485 -- instance of the formal (which must have been instantiated
9486 -- previously), unless the ancestor is itself a formal derived type.
9487 -- In this latter case (which is the subject of Corrigendum 8652/0038
9488 -- (AI-202) the ancestor of the formals is the ancestor of its
9489 -- parent. Otherwise, the analyzed generic carries the parent type.
9490 -- If the parent type is defined in a previous formal package, then
9491 -- the scope of that formal package is that of the generic type
9492 -- itself, and it has already been mapped into the corresponding type
9493 -- in the actual package.
9495 -- Common case: parent type defined outside of the generic
9497 if Is_Entity_Name (Subtype_Mark (Def))
9498 and then Present (Entity (Subtype_Mark (Def)))
9500 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9502 -- Check whether parent is defined in a previous formal package
9505 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9508 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9510 -- The type may be a local derivation, or a type extension of a
9511 -- previous formal, or of a formal of a parent package.
9513 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9515 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9517 -- Check whether the parent is another derived formal type in the
9518 -- same generic unit.
9520 if Etype (A_Gen_T) /= A_Gen_T
9521 and then Is_Generic_Type (Etype (A_Gen_T))
9522 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9523 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9525 -- Locate ancestor of parent from the subtype declaration
9526 -- created for the actual.
9532 Decl := First (Actual_Decls);
9533 while Present (Decl) loop
9534 if Nkind (Decl) = N_Subtype_Declaration
9535 and then Chars (Defining_Identifier (Decl)) =
9536 Chars (Etype (A_Gen_T))
9538 Ancestor := Generic_Parent_Type (Decl);
9546 pragma Assert (Present (Ancestor));
9550 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
9554 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
9557 -- If the formal derived type has pragma Preelaborable_Initialization
9558 -- then the actual type must have preelaborable initialization.
9560 if Known_To_Have_Preelab_Init (A_Gen_T)
9561 and then not Has_Preelaborable_Initialization (Act_T)
9564 ("actual for & must have preelaborable initialization",
9568 -- Ada 2005 (AI-251)
9570 if Ada_Version >= Ada_05
9571 and then Is_Interface (Ancestor)
9573 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
9575 ("(Ada 2005) expected type implementing & in instantiation",
9579 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
9581 ("expect type derived from & in instantiation",
9582 Actual, First_Subtype (Ancestor));
9583 Abandon_Instantiation (Actual);
9586 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
9587 -- that the formal type declaration has been rewritten as a private
9590 if Ada_Version >= Ada_05
9591 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
9592 and then Synchronized_Present (Parent (A_Gen_T))
9594 -- The actual must be a synchronized tagged type
9596 if not Is_Tagged_Type (Act_T) then
9598 ("actual of synchronized type must be tagged", Actual);
9599 Abandon_Instantiation (Actual);
9601 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
9602 and then Nkind (Type_Definition (Parent (Act_T))) =
9603 N_Derived_Type_Definition
9604 and then not Synchronized_Present (Type_Definition
9608 ("actual of synchronized type must be synchronized", Actual);
9609 Abandon_Instantiation (Actual);
9613 -- Perform atomic/volatile checks (RM C.6(12))
9615 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
9617 ("cannot have atomic actual type for non-atomic formal type",
9620 elsif Is_Volatile (Act_T)
9621 and then not Is_Volatile (Ancestor)
9622 and then Is_By_Reference_Type (Ancestor)
9625 ("cannot have volatile actual type for non-volatile formal type",
9629 -- It should not be necessary to check for unknown discriminants on
9630 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9631 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9632 -- needs fixing. ???
9634 if not Is_Indefinite_Subtype (A_Gen_T)
9635 and then not Unknown_Discriminants_Present (Formal)
9636 and then Is_Indefinite_Subtype (Act_T)
9639 ("actual subtype must be constrained", Actual);
9640 Abandon_Instantiation (Actual);
9643 if not Unknown_Discriminants_Present (Formal) then
9644 if Is_Constrained (Ancestor) then
9645 if not Is_Constrained (Act_T) then
9647 ("actual subtype must be constrained", Actual);
9648 Abandon_Instantiation (Actual);
9651 -- Ancestor is unconstrained, Check if generic formal and actual
9652 -- agree on constrainedness. The check only applies to array types
9653 -- and discriminated types.
9655 elsif Is_Constrained (Act_T) then
9656 if Ekind (Ancestor) = E_Access_Type
9658 (not Is_Constrained (A_Gen_T)
9659 and then Is_Composite_Type (A_Gen_T))
9662 ("actual subtype must be unconstrained", Actual);
9663 Abandon_Instantiation (Actual);
9666 -- A class-wide type is only allowed if the formal has unknown
9669 elsif Is_Class_Wide_Type (Act_T)
9670 and then not Has_Unknown_Discriminants (Ancestor)
9673 ("actual for & cannot be a class-wide type", Actual, Gen_T);
9674 Abandon_Instantiation (Actual);
9676 -- Otherwise, the formal and actual shall have the same number
9677 -- of discriminants and each discriminant of the actual must
9678 -- correspond to a discriminant of the formal.
9680 elsif Has_Discriminants (Act_T)
9681 and then not Has_Unknown_Discriminants (Act_T)
9682 and then Has_Discriminants (Ancestor)
9684 Actual_Discr := First_Discriminant (Act_T);
9685 Ancestor_Discr := First_Discriminant (Ancestor);
9686 while Present (Actual_Discr)
9687 and then Present (Ancestor_Discr)
9689 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
9690 No (Corresponding_Discriminant (Actual_Discr))
9693 ("discriminant & does not correspond " &
9694 "to ancestor discriminant", Actual, Actual_Discr);
9695 Abandon_Instantiation (Actual);
9698 Next_Discriminant (Actual_Discr);
9699 Next_Discriminant (Ancestor_Discr);
9702 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
9704 ("actual for & must have same number of discriminants",
9706 Abandon_Instantiation (Actual);
9709 -- This case should be caught by the earlier check for
9710 -- constrainedness, but the check here is added for completeness.
9712 elsif Has_Discriminants (Act_T)
9713 and then not Has_Unknown_Discriminants (Act_T)
9716 ("actual for & must not have discriminants", Actual, Gen_T);
9717 Abandon_Instantiation (Actual);
9719 elsif Has_Discriminants (Ancestor) then
9721 ("actual for & must have known discriminants", Actual, Gen_T);
9722 Abandon_Instantiation (Actual);
9725 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
9727 ("constraint on actual is incompatible with formal", Actual);
9728 Abandon_Instantiation (Actual);
9732 -- If the formal and actual types are abstract, check that there
9733 -- are no abstract primitives of the actual type that correspond to
9734 -- nonabstract primitives of the formal type (second sentence of
9737 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
9738 Check_Abstract_Primitives : declare
9739 Gen_Prims : constant Elist_Id :=
9740 Primitive_Operations (A_Gen_T);
9742 Gen_Subp : Entity_Id;
9743 Anc_Subp : Entity_Id;
9744 Anc_Formal : Entity_Id;
9745 Anc_F_Type : Entity_Id;
9747 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
9749 Act_Subp : Entity_Id;
9750 Act_Formal : Entity_Id;
9751 Act_F_Type : Entity_Id;
9753 Subprograms_Correspond : Boolean;
9755 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
9756 -- Returns true if T2 is derived directly or indirectly from
9757 -- T1, including derivations from interfaces. T1 and T2 are
9758 -- required to be specific tagged base types.
9760 ------------------------
9761 -- Is_Tagged_Ancestor --
9762 ------------------------
9764 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
9766 Intfc_Elmt : Elmt_Id;
9769 -- The predicate is satisfied if the types are the same
9774 -- If we've reached the top of the derivation chain then
9775 -- we know that T1 is not an ancestor of T2.
9777 elsif Etype (T2) = T2 then
9780 -- Proceed to check T2's immediate parent
9782 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
9785 -- Finally, check to see if T1 is an ancestor of any of T2's
9789 Intfc_Elmt := First_Elmt (Interfaces (T2));
9790 while Present (Intfc_Elmt) loop
9791 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
9795 Next_Elmt (Intfc_Elmt);
9800 end Is_Tagged_Ancestor;
9802 -- Start of processing for Check_Abstract_Primitives
9805 -- Loop over all of the formal derived type's primitives
9807 Gen_Elmt := First_Elmt (Gen_Prims);
9808 while Present (Gen_Elmt) loop
9809 Gen_Subp := Node (Gen_Elmt);
9811 -- If the primitive of the formal is not abstract, then
9812 -- determine whether there is a corresponding primitive of
9813 -- the actual type that's abstract.
9815 if not Is_Abstract_Subprogram (Gen_Subp) then
9816 Act_Elmt := First_Elmt (Act_Prims);
9817 while Present (Act_Elmt) loop
9818 Act_Subp := Node (Act_Elmt);
9820 -- If we find an abstract primitive of the actual,
9821 -- then we need to test whether it corresponds to the
9822 -- subprogram from which the generic formal primitive
9825 if Is_Abstract_Subprogram (Act_Subp) then
9826 Anc_Subp := Alias (Gen_Subp);
9828 -- Test whether we have a corresponding primitive
9829 -- by comparing names, kinds, formal types, and
9832 if Chars (Anc_Subp) = Chars (Act_Subp)
9833 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
9835 Anc_Formal := First_Formal (Anc_Subp);
9836 Act_Formal := First_Formal (Act_Subp);
9837 while Present (Anc_Formal)
9838 and then Present (Act_Formal)
9840 Anc_F_Type := Etype (Anc_Formal);
9841 Act_F_Type := Etype (Act_Formal);
9843 if Ekind (Anc_F_Type)
9844 = E_Anonymous_Access_Type
9846 Anc_F_Type := Designated_Type (Anc_F_Type);
9848 if Ekind (Act_F_Type)
9849 = E_Anonymous_Access_Type
9852 Designated_Type (Act_F_Type);
9858 Ekind (Act_F_Type) = E_Anonymous_Access_Type
9863 Anc_F_Type := Base_Type (Anc_F_Type);
9864 Act_F_Type := Base_Type (Act_F_Type);
9866 -- If the formal is controlling, then the
9867 -- the type of the actual primitive's formal
9868 -- must be derived directly or indirectly
9869 -- from the type of the ancestor primitive's
9872 if Is_Controlling_Formal (Anc_Formal) then
9873 if not Is_Tagged_Ancestor
9874 (Anc_F_Type, Act_F_Type)
9879 -- Otherwise the types of the formals must
9882 elsif Anc_F_Type /= Act_F_Type then
9886 Next_Entity (Anc_Formal);
9887 Next_Entity (Act_Formal);
9890 -- If we traversed through all of the formals
9891 -- then so far the subprograms correspond, so
9892 -- now check that any result types correspond.
9894 if No (Anc_Formal) and then No (Act_Formal) then
9895 Subprograms_Correspond := True;
9897 if Ekind (Act_Subp) = E_Function then
9898 Anc_F_Type := Etype (Anc_Subp);
9899 Act_F_Type := Etype (Act_Subp);
9901 if Ekind (Anc_F_Type)
9902 = E_Anonymous_Access_Type
9905 Designated_Type (Anc_F_Type);
9907 if Ekind (Act_F_Type)
9908 = E_Anonymous_Access_Type
9911 Designated_Type (Act_F_Type);
9913 Subprograms_Correspond := False;
9918 = E_Anonymous_Access_Type
9920 Subprograms_Correspond := False;
9923 Anc_F_Type := Base_Type (Anc_F_Type);
9924 Act_F_Type := Base_Type (Act_F_Type);
9926 -- Now either the result types must be
9927 -- the same or, if the result type is
9928 -- controlling, the result type of the
9929 -- actual primitive must descend from the
9930 -- result type of the ancestor primitive.
9932 if Subprograms_Correspond
9933 and then Anc_F_Type /= Act_F_Type
9935 Has_Controlling_Result (Anc_Subp)
9937 not Is_Tagged_Ancestor
9938 (Anc_F_Type, Act_F_Type)
9940 Subprograms_Correspond := False;
9944 -- Found a matching subprogram belonging to
9945 -- formal ancestor type, so actual subprogram
9946 -- corresponds and this violates 3.9.3(9).
9948 if Subprograms_Correspond then
9950 ("abstract subprogram & overrides " &
9951 "nonabstract subprogram of ancestor",
9959 Next_Elmt (Act_Elmt);
9963 Next_Elmt (Gen_Elmt);
9965 end Check_Abstract_Primitives;
9968 -- Verify that limitedness matches. If parent is a limited
9969 -- interface then the generic formal is not unless declared
9970 -- explicitly so. If not declared limited, the actual cannot be
9971 -- limited (see AI05-0087).
9973 -- Even though this AI is a binding interpretation, we enable the
9974 -- check only in Ada 2012 mode, because this improper construct
9975 -- shows up in user code and in existing B-tests.
9977 if Is_Limited_Type (Act_T)
9978 and then not Is_Limited_Type (A_Gen_T)
9979 and then Ada_Version >= Ada_12
9982 ("actual for non-limited & cannot be a limited type", Actual,
9984 Explain_Limited_Type (Act_T, Actual);
9985 Abandon_Instantiation (Actual);
9987 end Validate_Derived_Type_Instance;
9989 --------------------------------------
9990 -- Validate_Interface_Type_Instance --
9991 --------------------------------------
9993 procedure Validate_Interface_Type_Instance is
9995 if not Is_Interface (Act_T) then
9997 ("actual for formal interface type must be an interface",
10000 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
10002 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
10004 Is_Protected_Interface (A_Gen_T) /=
10005 Is_Protected_Interface (Act_T)
10007 Is_Synchronized_Interface (A_Gen_T) /=
10008 Is_Synchronized_Interface (Act_T)
10011 ("actual for interface& does not match (RM 12.5.5(4))",
10014 end Validate_Interface_Type_Instance;
10016 ------------------------------------
10017 -- Validate_Private_Type_Instance --
10018 ------------------------------------
10020 procedure Validate_Private_Type_Instance is
10021 Formal_Discr : Entity_Id;
10022 Actual_Discr : Entity_Id;
10023 Formal_Subt : Entity_Id;
10026 if Is_Limited_Type (Act_T)
10027 and then not Is_Limited_Type (A_Gen_T)
10030 ("actual for non-limited & cannot be a limited type", Actual,
10032 Explain_Limited_Type (Act_T, Actual);
10033 Abandon_Instantiation (Actual);
10035 elsif Known_To_Have_Preelab_Init (A_Gen_T)
10036 and then not Has_Preelaborable_Initialization (Act_T)
10039 ("actual for & must have preelaborable initialization", Actual,
10042 elsif Is_Indefinite_Subtype (Act_T)
10043 and then not Is_Indefinite_Subtype (A_Gen_T)
10044 and then Ada_Version >= Ada_95
10047 ("actual for & must be a definite subtype", Actual, Gen_T);
10049 elsif not Is_Tagged_Type (Act_T)
10050 and then Is_Tagged_Type (A_Gen_T)
10053 ("actual for & must be a tagged type", Actual, Gen_T);
10055 elsif Has_Discriminants (A_Gen_T) then
10056 if not Has_Discriminants (Act_T) then
10058 ("actual for & must have discriminants", Actual, Gen_T);
10059 Abandon_Instantiation (Actual);
10061 elsif Is_Constrained (Act_T) then
10063 ("actual for & must be unconstrained", Actual, Gen_T);
10064 Abandon_Instantiation (Actual);
10067 Formal_Discr := First_Discriminant (A_Gen_T);
10068 Actual_Discr := First_Discriminant (Act_T);
10069 while Formal_Discr /= Empty loop
10070 if Actual_Discr = Empty then
10072 ("discriminants on actual do not match formal",
10074 Abandon_Instantiation (Actual);
10077 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
10079 -- Access discriminants match if designated types do
10081 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
10082 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
10083 E_Anonymous_Access_Type
10086 (Designated_Type (Base_Type (Formal_Subt))) =
10087 Designated_Type (Base_Type (Etype (Actual_Discr)))
10091 elsif Base_Type (Formal_Subt) /=
10092 Base_Type (Etype (Actual_Discr))
10095 ("types of actual discriminants must match formal",
10097 Abandon_Instantiation (Actual);
10099 elsif not Subtypes_Statically_Match
10100 (Formal_Subt, Etype (Actual_Discr))
10101 and then Ada_Version >= Ada_95
10104 ("subtypes of actual discriminants must match formal",
10106 Abandon_Instantiation (Actual);
10109 Next_Discriminant (Formal_Discr);
10110 Next_Discriminant (Actual_Discr);
10113 if Actual_Discr /= Empty then
10115 ("discriminants on actual do not match formal",
10117 Abandon_Instantiation (Actual);
10124 end Validate_Private_Type_Instance;
10126 -- Start of processing for Instantiate_Type
10129 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
10130 Error_Msg_N ("duplicate instantiation of generic type", Actual);
10131 return New_List (Error);
10133 elsif not Is_Entity_Name (Actual)
10134 or else not Is_Type (Entity (Actual))
10137 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
10138 Abandon_Instantiation (Actual);
10141 Act_T := Entity (Actual);
10143 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
10144 -- as a generic actual parameter if the corresponding formal type
10145 -- does not have a known_discriminant_part, or is a formal derived
10146 -- type that is an Unchecked_Union type.
10148 if Is_Unchecked_Union (Base_Type (Act_T)) then
10149 if not Has_Discriminants (A_Gen_T)
10151 (Is_Derived_Type (A_Gen_T)
10153 Is_Unchecked_Union (A_Gen_T))
10157 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
10158 " discriminated formal type", Act_T);
10163 -- Deal with fixed/floating restrictions
10165 if Is_Floating_Point_Type (Act_T) then
10166 Check_Restriction (No_Floating_Point, Actual);
10167 elsif Is_Fixed_Point_Type (Act_T) then
10168 Check_Restriction (No_Fixed_Point, Actual);
10171 -- Deal with error of using incomplete type as generic actual.
10172 -- This includes limited views of a type, even if the non-limited
10173 -- view may be available.
10175 if Ekind (Act_T) = E_Incomplete_Type
10176 or else (Is_Class_Wide_Type (Act_T)
10178 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
10180 if Is_Class_Wide_Type (Act_T)
10181 or else No (Full_View (Act_T))
10183 Error_Msg_N ("premature use of incomplete type", Actual);
10184 Abandon_Instantiation (Actual);
10186 Act_T := Full_View (Act_T);
10187 Set_Entity (Actual, Act_T);
10189 if Has_Private_Component (Act_T) then
10191 ("premature use of type with private component", Actual);
10195 -- Deal with error of premature use of private type as generic actual
10197 elsif Is_Private_Type (Act_T)
10198 and then Is_Private_Type (Base_Type (Act_T))
10199 and then not Is_Generic_Type (Act_T)
10200 and then not Is_Derived_Type (Act_T)
10201 and then No (Full_View (Root_Type (Act_T)))
10203 Error_Msg_N ("premature use of private type", Actual);
10205 elsif Has_Private_Component (Act_T) then
10207 ("premature use of type with private component", Actual);
10210 Set_Instance_Of (A_Gen_T, Act_T);
10212 -- If the type is generic, the class-wide type may also be used
10214 if Is_Tagged_Type (A_Gen_T)
10215 and then Is_Tagged_Type (Act_T)
10216 and then not Is_Class_Wide_Type (A_Gen_T)
10218 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
10219 Class_Wide_Type (Act_T));
10222 if not Is_Abstract_Type (A_Gen_T)
10223 and then Is_Abstract_Type (Act_T)
10226 ("actual of non-abstract formal cannot be abstract", Actual);
10229 -- A generic scalar type is a first subtype for which we generate
10230 -- an anonymous base type. Indicate that the instance of this base
10231 -- is the base type of the actual.
10233 if Is_Scalar_Type (A_Gen_T) then
10234 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
10238 if Error_Posted (Act_T) then
10241 case Nkind (Def) is
10242 when N_Formal_Private_Type_Definition =>
10243 Validate_Private_Type_Instance;
10245 when N_Formal_Derived_Type_Definition =>
10246 Validate_Derived_Type_Instance;
10248 when N_Formal_Discrete_Type_Definition =>
10249 if not Is_Discrete_Type (Act_T) then
10251 ("expect discrete type in instantiation of&",
10253 Abandon_Instantiation (Actual);
10256 when N_Formal_Signed_Integer_Type_Definition =>
10257 if not Is_Signed_Integer_Type (Act_T) then
10259 ("expect signed integer type in instantiation of&",
10261 Abandon_Instantiation (Actual);
10264 when N_Formal_Modular_Type_Definition =>
10265 if not Is_Modular_Integer_Type (Act_T) then
10267 ("expect modular type in instantiation of &",
10269 Abandon_Instantiation (Actual);
10272 when N_Formal_Floating_Point_Definition =>
10273 if not Is_Floating_Point_Type (Act_T) then
10275 ("expect float type in instantiation of &", Actual, Gen_T);
10276 Abandon_Instantiation (Actual);
10279 when N_Formal_Ordinary_Fixed_Point_Definition =>
10280 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
10282 ("expect ordinary fixed point type in instantiation of &",
10284 Abandon_Instantiation (Actual);
10287 when N_Formal_Decimal_Fixed_Point_Definition =>
10288 if not Is_Decimal_Fixed_Point_Type (Act_T) then
10290 ("expect decimal type in instantiation of &",
10292 Abandon_Instantiation (Actual);
10295 when N_Array_Type_Definition =>
10296 Validate_Array_Type_Instance;
10298 when N_Access_To_Object_Definition =>
10299 Validate_Access_Type_Instance;
10301 when N_Access_Function_Definition |
10302 N_Access_Procedure_Definition =>
10303 Validate_Access_Subprogram_Instance;
10305 when N_Record_Definition =>
10306 Validate_Interface_Type_Instance;
10308 when N_Derived_Type_Definition =>
10309 Validate_Derived_Interface_Type_Instance;
10312 raise Program_Error;
10317 Subt := New_Copy (Gen_T);
10319 -- Use adjusted sloc of subtype name as the location for other nodes in
10320 -- the subtype declaration.
10322 Loc := Sloc (Subt);
10325 Make_Subtype_Declaration (Loc,
10326 Defining_Identifier => Subt,
10327 Subtype_Indication => New_Reference_To (Act_T, Loc));
10329 if Is_Private_Type (Act_T) then
10330 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10332 elsif Is_Access_Type (Act_T)
10333 and then Is_Private_Type (Designated_Type (Act_T))
10335 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10338 Decl_Nodes := New_List (Decl_Node);
10340 -- Flag actual derived types so their elaboration produces the
10341 -- appropriate renamings for the primitive operations of the ancestor.
10342 -- Flag actual for formal private types as well, to determine whether
10343 -- operations in the private part may override inherited operations.
10344 -- If the formal has an interface list, the ancestor is not the
10345 -- parent, but the analyzed formal that includes the interface
10346 -- operations of all its progenitors.
10348 if Nkind (Def) = N_Formal_Derived_Type_Definition then
10349 if Present (Interface_List (Def)) then
10350 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10352 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10355 elsif Nkind (Def) = N_Formal_Private_Type_Definition then
10356 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10359 -- If the actual is a synchronized type that implements an interface,
10360 -- the primitive operations are attached to the corresponding record,
10361 -- and we have to treat it as an additional generic actual, so that its
10362 -- primitive operations become visible in the instance. The task or
10363 -- protected type itself does not carry primitive operations.
10365 if Is_Concurrent_Type (Act_T)
10366 and then Is_Tagged_Type (Act_T)
10367 and then Present (Corresponding_Record_Type (Act_T))
10368 and then Present (Ancestor)
10369 and then Is_Interface (Ancestor)
10372 Corr_Rec : constant Entity_Id :=
10373 Corresponding_Record_Type (Act_T);
10374 New_Corr : Entity_Id;
10375 Corr_Decl : Node_Id;
10378 New_Corr := Make_Temporary (Loc, 'S');
10380 Make_Subtype_Declaration (Loc,
10381 Defining_Identifier => New_Corr,
10382 Subtype_Indication =>
10383 New_Reference_To (Corr_Rec, Loc));
10384 Append_To (Decl_Nodes, Corr_Decl);
10386 if Ekind (Act_T) = E_Task_Type then
10387 Set_Ekind (Subt, E_Task_Subtype);
10389 Set_Ekind (Subt, E_Protected_Subtype);
10392 Set_Corresponding_Record_Type (Subt, Corr_Rec);
10393 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
10394 Set_Generic_Parent_Type (Decl_Node, Empty);
10399 end Instantiate_Type;
10401 -----------------------
10402 -- Is_Generic_Formal --
10403 -----------------------
10405 function Is_Generic_Formal (E : Entity_Id) return Boolean is
10411 Kind := Nkind (Parent (E));
10413 Nkind_In (Kind, N_Formal_Object_Declaration,
10414 N_Formal_Package_Declaration,
10415 N_Formal_Type_Declaration)
10417 (Is_Formal_Subprogram (E)
10419 Nkind (Parent (Parent (E))) in
10420 N_Formal_Subprogram_Declaration);
10422 end Is_Generic_Formal;
10424 ---------------------
10425 -- Is_In_Main_Unit --
10426 ---------------------
10428 function Is_In_Main_Unit (N : Node_Id) return Boolean is
10429 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
10430 Current_Unit : Node_Id;
10433 if Unum = Main_Unit then
10436 -- If the current unit is a subunit then it is either the main unit or
10437 -- is being compiled as part of the main unit.
10439 elsif Nkind (N) = N_Compilation_Unit then
10440 return Nkind (Unit (N)) = N_Subunit;
10443 Current_Unit := Parent (N);
10444 while Present (Current_Unit)
10445 and then Nkind (Current_Unit) /= N_Compilation_Unit
10447 Current_Unit := Parent (Current_Unit);
10450 -- The instantiation node is in the main unit, or else the current node
10451 -- (perhaps as the result of nested instantiations) is in the main unit,
10452 -- or in the declaration of the main unit, which in this last case must
10455 return Unum = Main_Unit
10456 or else Current_Unit = Cunit (Main_Unit)
10457 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
10458 or else (Present (Library_Unit (Current_Unit))
10459 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
10460 end Is_In_Main_Unit;
10462 ----------------------------
10463 -- Load_Parent_Of_Generic --
10464 ----------------------------
10466 procedure Load_Parent_Of_Generic
10469 Body_Optional : Boolean := False)
10471 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
10472 Save_Style_Check : constant Boolean := Style_Check;
10473 True_Parent : Node_Id;
10474 Inst_Node : Node_Id;
10476 Previous_Instances : constant Elist_Id := New_Elmt_List;
10478 procedure Collect_Previous_Instances (Decls : List_Id);
10479 -- Collect all instantiations in the given list of declarations, that
10480 -- precede the generic that we need to load. If the bodies of these
10481 -- instantiations are available, we must analyze them, to ensure that
10482 -- the public symbols generated are the same when the unit is compiled
10483 -- to generate code, and when it is compiled in the context of a unit
10484 -- that needs a particular nested instance. This process is applied to
10485 -- both package and subprogram instances.
10487 --------------------------------
10488 -- Collect_Previous_Instances --
10489 --------------------------------
10491 procedure Collect_Previous_Instances (Decls : List_Id) is
10495 Decl := First (Decls);
10496 while Present (Decl) loop
10497 if Sloc (Decl) >= Sloc (Inst_Node) then
10500 -- If Decl is an instantiation, then record it as requiring
10501 -- instantiation of the corresponding body, except if it is an
10502 -- abbreviated instantiation generated internally for conformance
10503 -- checking purposes only for the case of a formal package
10504 -- declared without a box (see Instantiate_Formal_Package). Such
10505 -- an instantiation does not generate any code (the actual code
10506 -- comes from actual) and thus does not need to be analyzed here.
10507 -- If the instantiation appears with a generic package body it is
10508 -- not analyzed here either.
10510 elsif Nkind (Decl) = N_Package_Instantiation
10511 and then not Is_Internal (Defining_Entity (Decl))
10513 Append_Elmt (Decl, Previous_Instances);
10515 -- For a subprogram instantiation, omit instantiations intrinsic
10516 -- operations (Unchecked_Conversions, etc.) that have no bodies.
10518 elsif Nkind_In (Decl, N_Function_Instantiation,
10519 N_Procedure_Instantiation)
10520 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
10522 Append_Elmt (Decl, Previous_Instances);
10524 elsif Nkind (Decl) = N_Package_Declaration then
10525 Collect_Previous_Instances
10526 (Visible_Declarations (Specification (Decl)));
10527 Collect_Previous_Instances
10528 (Private_Declarations (Specification (Decl)));
10530 -- Previous non-generic bodies may contain instances as well
10532 elsif Nkind (Decl) = N_Package_Body
10533 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
10535 Collect_Previous_Instances (Declarations (Decl));
10537 elsif Nkind (Decl) = N_Subprogram_Body
10538 and then not Acts_As_Spec (Decl)
10539 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
10541 Collect_Previous_Instances (Declarations (Decl));
10546 end Collect_Previous_Instances;
10548 -- Start of processing for Load_Parent_Of_Generic
10551 if not In_Same_Source_Unit (N, Spec)
10552 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
10553 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
10554 and then not Is_In_Main_Unit (Spec))
10556 -- Find body of parent of spec, and analyze it. A special case arises
10557 -- when the parent is an instantiation, that is to say when we are
10558 -- currently instantiating a nested generic. In that case, there is
10559 -- no separate file for the body of the enclosing instance. Instead,
10560 -- the enclosing body must be instantiated as if it were a pending
10561 -- instantiation, in order to produce the body for the nested generic
10562 -- we require now. Note that in that case the generic may be defined
10563 -- in a package body, the instance defined in the same package body,
10564 -- and the original enclosing body may not be in the main unit.
10566 Inst_Node := Empty;
10568 True_Parent := Parent (Spec);
10569 while Present (True_Parent)
10570 and then Nkind (True_Parent) /= N_Compilation_Unit
10572 if Nkind (True_Parent) = N_Package_Declaration
10574 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
10576 -- Parent is a compilation unit that is an instantiation.
10577 -- Instantiation node has been replaced with package decl.
10579 Inst_Node := Original_Node (True_Parent);
10582 elsif Nkind (True_Parent) = N_Package_Declaration
10583 and then Present (Generic_Parent (Specification (True_Parent)))
10584 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10586 -- Parent is an instantiation within another specification.
10587 -- Declaration for instance has been inserted before original
10588 -- instantiation node. A direct link would be preferable?
10590 Inst_Node := Next (True_Parent);
10591 while Present (Inst_Node)
10592 and then Nkind (Inst_Node) /= N_Package_Instantiation
10597 -- If the instance appears within a generic, and the generic
10598 -- unit is defined within a formal package of the enclosing
10599 -- generic, there is no generic body available, and none
10600 -- needed. A more precise test should be used ???
10602 if No (Inst_Node) then
10609 True_Parent := Parent (True_Parent);
10613 -- Case where we are currently instantiating a nested generic
10615 if Present (Inst_Node) then
10616 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
10618 -- Instantiation node and declaration of instantiated package
10619 -- were exchanged when only the declaration was needed.
10620 -- Restore instantiation node before proceeding with body.
10622 Set_Unit (Parent (True_Parent), Inst_Node);
10625 -- Now complete instantiation of enclosing body, if it appears in
10626 -- some other unit. If it appears in the current unit, the body
10627 -- will have been instantiated already.
10629 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
10631 -- We need to determine the expander mode to instantiate the
10632 -- enclosing body. Because the generic body we need may use
10633 -- global entities declared in the enclosing package (including
10634 -- aggregates) it is in general necessary to compile this body
10635 -- with expansion enabled, except if we are within a generic
10636 -- package, in which case the usual generic rule applies.
10639 Exp_Status : Boolean := True;
10643 -- Loop through scopes looking for generic package
10645 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
10646 while Present (Scop)
10647 and then Scop /= Standard_Standard
10649 if Ekind (Scop) = E_Generic_Package then
10650 Exp_Status := False;
10654 Scop := Scope (Scop);
10657 -- Collect previous instantiations in the unit that contains
10658 -- the desired generic.
10660 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10661 and then not Body_Optional
10665 Info : Pending_Body_Info;
10669 Par := Parent (Inst_Node);
10670 while Present (Par) loop
10671 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
10672 Par := Parent (Par);
10675 pragma Assert (Present (Par));
10677 if Nkind (Par) = N_Package_Body then
10678 Collect_Previous_Instances (Declarations (Par));
10680 elsif Nkind (Par) = N_Package_Declaration then
10681 Collect_Previous_Instances
10682 (Visible_Declarations (Specification (Par)));
10683 Collect_Previous_Instances
10684 (Private_Declarations (Specification (Par)));
10687 -- Enclosing unit is a subprogram body. In this
10688 -- case all instance bodies are processed in order
10689 -- and there is no need to collect them separately.
10694 Decl := First_Elmt (Previous_Instances);
10695 while Present (Decl) loop
10697 (Inst_Node => Node (Decl),
10699 Instance_Spec (Node (Decl)),
10700 Expander_Status => Exp_Status,
10701 Current_Sem_Unit =>
10702 Get_Code_Unit (Sloc (Node (Decl))),
10703 Scope_Suppress => Scope_Suppress,
10704 Local_Suppress_Stack_Top =>
10705 Local_Suppress_Stack_Top,
10706 Version => Ada_Version);
10708 -- Package instance
10711 Nkind (Node (Decl)) = N_Package_Instantiation
10713 Instantiate_Package_Body
10714 (Info, Body_Optional => True);
10716 -- Subprogram instance
10719 -- The instance_spec is the wrapper package,
10720 -- and the subprogram declaration is the last
10721 -- declaration in the wrapper.
10725 (Visible_Declarations
10726 (Specification (Info.Act_Decl)));
10728 Instantiate_Subprogram_Body
10729 (Info, Body_Optional => True);
10737 Instantiate_Package_Body
10739 ((Inst_Node => Inst_Node,
10740 Act_Decl => True_Parent,
10741 Expander_Status => Exp_Status,
10742 Current_Sem_Unit =>
10743 Get_Code_Unit (Sloc (Inst_Node)),
10744 Scope_Suppress => Scope_Suppress,
10745 Local_Suppress_Stack_Top =>
10746 Local_Suppress_Stack_Top,
10747 Version => Ada_Version)),
10748 Body_Optional => Body_Optional);
10752 -- Case where we are not instantiating a nested generic
10755 Opt.Style_Check := False;
10756 Expander_Mode_Save_And_Set (True);
10757 Load_Needed_Body (Comp_Unit, OK);
10758 Opt.Style_Check := Save_Style_Check;
10759 Expander_Mode_Restore;
10762 and then Unit_Requires_Body (Defining_Entity (Spec))
10763 and then not Body_Optional
10766 Bname : constant Unit_Name_Type :=
10767 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
10770 -- In CodePeer mode, the missing body may make the analysis
10771 -- incomplete, but we do not treat it as fatal.
10773 if CodePeer_Mode then
10777 Error_Msg_Unit_1 := Bname;
10778 Error_Msg_N ("this instantiation requires$!", N);
10779 Error_Msg_File_1 :=
10780 Get_File_Name (Bname, Subunit => False);
10781 Error_Msg_N ("\but file{ was not found!", N);
10782 raise Unrecoverable_Error;
10789 -- If loading parent of the generic caused an instantiation circularity,
10790 -- we abandon compilation at this point, because otherwise in some cases
10791 -- we get into trouble with infinite recursions after this point.
10793 if Circularity_Detected then
10794 raise Unrecoverable_Error;
10796 end Load_Parent_Of_Generic;
10798 ---------------------------------
10799 -- Map_Formal_Package_Entities --
10800 ---------------------------------
10802 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
10807 Set_Instance_Of (Form, Act);
10809 -- Traverse formal and actual package to map the corresponding entities.
10810 -- We skip over internal entities that may be generated during semantic
10811 -- analysis, and find the matching entities by name, given that they
10812 -- must appear in the same order.
10814 E1 := First_Entity (Form);
10815 E2 := First_Entity (Act);
10816 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
10817 -- Could this test be a single condition???
10818 -- Seems like it could, and isn't FPE (Form) a constant anyway???
10820 if not Is_Internal (E1)
10821 and then Present (Parent (E1))
10822 and then not Is_Class_Wide_Type (E1)
10823 and then not Is_Internal_Name (Chars (E1))
10825 while Present (E2) and then Chars (E2) /= Chars (E1) loop
10832 Set_Instance_Of (E1, E2);
10834 if Is_Type (E1) and then Is_Tagged_Type (E2) then
10835 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
10838 if Is_Constrained (E1) then
10839 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
10842 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
10843 Map_Formal_Package_Entities (E1, E2);
10850 end Map_Formal_Package_Entities;
10852 -----------------------
10853 -- Move_Freeze_Nodes --
10854 -----------------------
10856 procedure Move_Freeze_Nodes
10857 (Out_Of : Entity_Id;
10862 Next_Decl : Node_Id;
10863 Next_Node : Node_Id := After;
10866 function Is_Outer_Type (T : Entity_Id) return Boolean;
10867 -- Check whether entity is declared in a scope external to that of the
10870 -------------------
10871 -- Is_Outer_Type --
10872 -------------------
10874 function Is_Outer_Type (T : Entity_Id) return Boolean is
10875 Scop : Entity_Id := Scope (T);
10878 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
10882 while Scop /= Standard_Standard loop
10883 if Scop = Out_Of then
10886 Scop := Scope (Scop);
10894 -- Start of processing for Move_Freeze_Nodes
10901 -- First remove the freeze nodes that may appear before all other
10905 while Present (Decl)
10906 and then Nkind (Decl) = N_Freeze_Entity
10907 and then Is_Outer_Type (Entity (Decl))
10909 Decl := Remove_Head (L);
10910 Insert_After (Next_Node, Decl);
10911 Set_Analyzed (Decl, False);
10916 -- Next scan the list of declarations and remove each freeze node that
10917 -- appears ahead of the current node.
10919 while Present (Decl) loop
10920 while Present (Next (Decl))
10921 and then Nkind (Next (Decl)) = N_Freeze_Entity
10922 and then Is_Outer_Type (Entity (Next (Decl)))
10924 Next_Decl := Remove_Next (Decl);
10925 Insert_After (Next_Node, Next_Decl);
10926 Set_Analyzed (Next_Decl, False);
10927 Next_Node := Next_Decl;
10930 -- If the declaration is a nested package or concurrent type, then
10931 -- recurse. Nested generic packages will have been processed from the
10934 case Nkind (Decl) is
10935 when N_Package_Declaration =>
10936 Spec := Specification (Decl);
10938 when N_Task_Type_Declaration =>
10939 Spec := Task_Definition (Decl);
10941 when N_Protected_Type_Declaration =>
10942 Spec := Protected_Definition (Decl);
10948 if Present (Spec) then
10949 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
10950 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
10955 end Move_Freeze_Nodes;
10961 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
10963 return Generic_Renamings.Table (E).Next_In_HTable;
10966 ------------------------
10967 -- Preanalyze_Actuals --
10968 ------------------------
10970 procedure Preanalyze_Actuals (N : Node_Id) is
10973 Errs : constant Int := Serious_Errors_Detected;
10975 Cur : Entity_Id := Empty;
10976 -- Current homograph of the instance name
10979 -- Saved visibility status of the current homograph
10982 Assoc := First (Generic_Associations (N));
10984 -- If the instance is a child unit, its name may hide an outer homonym,
10985 -- so make it invisible to perform name resolution on the actuals.
10987 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
10989 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
10991 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
10993 if Is_Compilation_Unit (Cur) then
10994 Vis := Is_Immediately_Visible (Cur);
10995 Set_Is_Immediately_Visible (Cur, False);
11001 while Present (Assoc) loop
11002 if Nkind (Assoc) /= N_Others_Choice then
11003 Act := Explicit_Generic_Actual_Parameter (Assoc);
11005 -- Within a nested instantiation, a defaulted actual is an empty
11006 -- association, so nothing to analyze. If the subprogram actual
11007 -- is an attribute, analyze prefix only, because actual is not a
11008 -- complete attribute reference.
11010 -- If actual is an allocator, analyze expression only. The full
11011 -- analysis can generate code, and if instance is a compilation
11012 -- unit we have to wait until the package instance is installed
11013 -- to have a proper place to insert this code.
11015 -- String literals may be operators, but at this point we do not
11016 -- know whether the actual is a formal subprogram or a string.
11021 elsif Nkind (Act) = N_Attribute_Reference then
11022 Analyze (Prefix (Act));
11024 elsif Nkind (Act) = N_Explicit_Dereference then
11025 Analyze (Prefix (Act));
11027 elsif Nkind (Act) = N_Allocator then
11029 Expr : constant Node_Id := Expression (Act);
11032 if Nkind (Expr) = N_Subtype_Indication then
11033 Analyze (Subtype_Mark (Expr));
11035 -- Analyze separately each discriminant constraint, when
11036 -- given with a named association.
11042 Constr := First (Constraints (Constraint (Expr)));
11043 while Present (Constr) loop
11044 if Nkind (Constr) = N_Discriminant_Association then
11045 Analyze (Expression (Constr));
11059 elsif Nkind (Act) /= N_Operator_Symbol then
11063 if Errs /= Serious_Errors_Detected then
11065 -- Do a minimal analysis of the generic, to prevent spurious
11066 -- warnings complaining about the generic being unreferenced,
11067 -- before abandoning the instantiation.
11069 Analyze (Name (N));
11071 if Is_Entity_Name (Name (N))
11072 and then Etype (Name (N)) /= Any_Type
11074 Generate_Reference (Entity (Name (N)), Name (N));
11075 Set_Is_Instantiated (Entity (Name (N)));
11078 if Present (Cur) then
11080 -- For the case of a child instance hiding an outer homonym,
11081 -- provide additional warning which might explain the error.
11083 Set_Is_Immediately_Visible (Cur, Vis);
11084 Error_Msg_NE ("& hides outer unit with the same name?",
11085 N, Defining_Unit_Name (N));
11088 Abandon_Instantiation (Act);
11095 if Present (Cur) then
11096 Set_Is_Immediately_Visible (Cur, Vis);
11098 end Preanalyze_Actuals;
11100 -------------------
11101 -- Remove_Parent --
11102 -------------------
11104 procedure Remove_Parent (In_Body : Boolean := False) is
11105 S : Entity_Id := Current_Scope;
11106 -- S is the scope containing the instantiation just completed. The scope
11107 -- stack contains the parent instances of the instantiation, followed by
11116 -- After child instantiation is complete, remove from scope stack the
11117 -- extra copy of the current scope, and then remove parent instances.
11119 if not In_Body then
11122 while Current_Scope /= S loop
11123 P := Current_Scope;
11124 End_Package_Scope (Current_Scope);
11126 if In_Open_Scopes (P) then
11127 E := First_Entity (P);
11128 while Present (E) loop
11129 Set_Is_Immediately_Visible (E, True);
11133 -- If instantiation is declared in a block, it is the enclosing
11134 -- scope that might be a parent instance. Note that only one
11135 -- block can be involved, because the parent instances have
11136 -- been installed within it.
11138 if Ekind (P) = E_Block then
11139 Cur_P := Scope (P);
11144 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
11145 -- We are within an instance of some sibling. Retain
11146 -- visibility of parent, for proper subsequent cleanup, and
11147 -- reinstall private declarations as well.
11149 Set_In_Private_Part (P);
11150 Install_Private_Declarations (P);
11153 -- If the ultimate parent is a top-level unit recorded in
11154 -- Instance_Parent_Unit, then reset its visibility to what it was
11155 -- before instantiation. (It's not clear what the purpose is of
11156 -- testing whether Scope (P) is In_Open_Scopes, but that test was
11157 -- present before the ultimate parent test was added.???)
11159 elsif not In_Open_Scopes (Scope (P))
11160 or else (P = Instance_Parent_Unit
11161 and then not Parent_Unit_Visible)
11163 Set_Is_Immediately_Visible (P, False);
11165 -- If the current scope is itself an instantiation of a generic
11166 -- nested within P, and we are in the private part of body of this
11167 -- instantiation, restore the full views of P, that were removed
11168 -- in End_Package_Scope above. This obscure case can occur when a
11169 -- subunit of a generic contains an instance of a child unit of
11170 -- its generic parent unit.
11172 elsif S = Current_Scope and then Is_Generic_Instance (S) then
11174 Par : constant Entity_Id :=
11176 (Specification (Unit_Declaration_Node (S)));
11179 and then P = Scope (Par)
11180 and then (In_Package_Body (S) or else In_Private_Part (S))
11182 Set_In_Private_Part (P);
11183 Install_Private_Declarations (P);
11189 -- Reset visibility of entities in the enclosing scope
11191 Set_Is_Hidden_Open_Scope (Current_Scope, False);
11193 Hidden := First_Elmt (Hidden_Entities);
11194 while Present (Hidden) loop
11195 Set_Is_Immediately_Visible (Node (Hidden), True);
11196 Next_Elmt (Hidden);
11200 -- Each body is analyzed separately, and there is no context that
11201 -- needs preserving from one body instance to the next, so remove all
11202 -- parent scopes that have been installed.
11204 while Present (S) loop
11205 End_Package_Scope (S);
11206 Set_Is_Immediately_Visible (S, False);
11207 S := Current_Scope;
11208 exit when S = Standard_Standard;
11217 procedure Restore_Env is
11218 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
11221 if No (Current_Instantiated_Parent.Act_Id) then
11222 -- Restore environment after subprogram inlining
11224 Restore_Private_Views (Empty);
11227 Current_Instantiated_Parent := Saved.Instantiated_Parent;
11228 Exchanged_Views := Saved.Exchanged_Views;
11229 Hidden_Entities := Saved.Hidden_Entities;
11230 Current_Sem_Unit := Saved.Current_Sem_Unit;
11231 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
11232 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
11234 Restore_Opt_Config_Switches (Saved.Switches);
11236 Instance_Envs.Decrement_Last;
11239 ---------------------------
11240 -- Restore_Private_Views --
11241 ---------------------------
11243 procedure Restore_Private_Views
11244 (Pack_Id : Entity_Id;
11245 Is_Package : Boolean := True)
11250 Dep_Elmt : Elmt_Id;
11253 procedure Restore_Nested_Formal (Formal : Entity_Id);
11254 -- Hide the generic formals of formal packages declared with box which
11255 -- were reachable in the current instantiation.
11257 ---------------------------
11258 -- Restore_Nested_Formal --
11259 ---------------------------
11261 procedure Restore_Nested_Formal (Formal : Entity_Id) is
11265 if Present (Renamed_Object (Formal))
11266 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
11270 elsif Present (Associated_Formal_Package (Formal)) then
11271 Ent := First_Entity (Formal);
11272 while Present (Ent) loop
11273 exit when Ekind (Ent) = E_Package
11274 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
11276 Set_Is_Hidden (Ent);
11277 Set_Is_Potentially_Use_Visible (Ent, False);
11279 -- If package, then recurse
11281 if Ekind (Ent) = E_Package then
11282 Restore_Nested_Formal (Ent);
11288 end Restore_Nested_Formal;
11290 -- Start of processing for Restore_Private_Views
11293 M := First_Elmt (Exchanged_Views);
11294 while Present (M) loop
11297 -- Subtypes of types whose views have been exchanged, and that are
11298 -- defined within the instance, were not on the Private_Dependents
11299 -- list on entry to the instance, so they have to be exchanged
11300 -- explicitly now, in order to remain consistent with the view of the
11303 if Ekind_In (Typ, E_Private_Type,
11304 E_Limited_Private_Type,
11305 E_Record_Type_With_Private)
11307 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
11308 while Present (Dep_Elmt) loop
11309 Dep_Typ := Node (Dep_Elmt);
11311 if Scope (Dep_Typ) = Pack_Id
11312 and then Present (Full_View (Dep_Typ))
11314 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
11315 Exchange_Declarations (Dep_Typ);
11318 Next_Elmt (Dep_Elmt);
11322 Exchange_Declarations (Node (M));
11326 if No (Pack_Id) then
11330 -- Make the generic formal parameters private, and make the formal types
11331 -- into subtypes of the actuals again.
11333 E := First_Entity (Pack_Id);
11334 while Present (E) loop
11335 Set_Is_Hidden (E, True);
11338 and then Nkind (Parent (E)) = N_Subtype_Declaration
11340 Set_Is_Generic_Actual_Type (E, False);
11342 -- An unusual case of aliasing: the actual may also be directly
11343 -- visible in the generic, and be private there, while it is fully
11344 -- visible in the context of the instance. The internal subtype
11345 -- is private in the instance but has full visibility like its
11346 -- parent in the enclosing scope. This enforces the invariant that
11347 -- the privacy status of all private dependents of a type coincide
11348 -- with that of the parent type. This can only happen when a
11349 -- generic child unit is instantiated within a sibling.
11351 if Is_Private_Type (E)
11352 and then not Is_Private_Type (Etype (E))
11354 Exchange_Declarations (E);
11357 elsif Ekind (E) = E_Package then
11359 -- The end of the renaming list is the renaming of the generic
11360 -- package itself. If the instance is a subprogram, all entities
11361 -- in the corresponding package are renamings. If this entity is
11362 -- a formal package, make its own formals private as well. The
11363 -- actual in this case is itself the renaming of an instantiation.
11364 -- If the entity is not a package renaming, it is the entity
11365 -- created to validate formal package actuals: ignore it.
11367 -- If the actual is itself a formal package for the enclosing
11368 -- generic, or the actual for such a formal package, it remains
11369 -- visible on exit from the instance, and therefore nothing needs
11370 -- to be done either, except to keep it accessible.
11372 if Is_Package and then Renamed_Object (E) = Pack_Id then
11375 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
11379 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
11381 Set_Is_Hidden (E, False);
11385 Act_P : constant Entity_Id := Renamed_Object (E);
11389 Id := First_Entity (Act_P);
11391 and then Id /= First_Private_Entity (Act_P)
11393 exit when Ekind (Id) = E_Package
11394 and then Renamed_Object (Id) = Act_P;
11396 Set_Is_Hidden (Id, True);
11397 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
11399 if Ekind (Id) = E_Package then
11400 Restore_Nested_Formal (Id);
11411 end Restore_Private_Views;
11418 (Gen_Unit : Entity_Id;
11419 Act_Unit : Entity_Id)
11423 Set_Instance_Env (Gen_Unit, Act_Unit);
11426 ----------------------------
11427 -- Save_Global_References --
11428 ----------------------------
11430 procedure Save_Global_References (N : Node_Id) is
11431 Gen_Scope : Entity_Id;
11435 function Is_Global (E : Entity_Id) return Boolean;
11436 -- Check whether entity is defined outside of generic unit. Examine the
11437 -- scope of an entity, and the scope of the scope, etc, until we find
11438 -- either Standard, in which case the entity is global, or the generic
11439 -- unit itself, which indicates that the entity is local. If the entity
11440 -- is the generic unit itself, as in the case of a recursive call, or
11441 -- the enclosing generic unit, if different from the current scope, then
11442 -- it is local as well, because it will be replaced at the point of
11443 -- instantiation. On the other hand, if it is a reference to a child
11444 -- unit of a common ancestor, which appears in an instantiation, it is
11445 -- global because it is used to denote a specific compilation unit at
11446 -- the time the instantiations will be analyzed.
11448 procedure Reset_Entity (N : Node_Id);
11449 -- Save semantic information on global entity so that it is not resolved
11450 -- again at instantiation time.
11452 procedure Save_Entity_Descendants (N : Node_Id);
11453 -- Apply Save_Global_References to the two syntactic descendants of
11454 -- non-terminal nodes that carry an Associated_Node and are processed
11455 -- through Reset_Entity. Once the global entity (if any) has been
11456 -- captured together with its type, only two syntactic descendants need
11457 -- to be traversed to complete the processing of the tree rooted at N.
11458 -- This applies to Selected_Components, Expanded_Names, and to Operator
11459 -- nodes. N can also be a character literal, identifier, or operator
11460 -- symbol node, but the call has no effect in these cases.
11462 procedure Save_Global_Defaults (N1, N2 : Node_Id);
11463 -- Default actuals in nested instances must be handled specially
11464 -- because there is no link to them from the original tree. When an
11465 -- actual subprogram is given by a default, we add an explicit generic
11466 -- association for it in the instantiation node. When we save the
11467 -- global references on the name of the instance, we recover the list
11468 -- of generic associations, and add an explicit one to the original
11469 -- generic tree, through which a global actual can be preserved.
11470 -- Similarly, if a child unit is instantiated within a sibling, in the
11471 -- context of the parent, we must preserve the identifier of the parent
11472 -- so that it can be properly resolved in a subsequent instantiation.
11474 procedure Save_Global_Descendant (D : Union_Id);
11475 -- Apply Save_Global_References recursively to the descendents of the
11478 procedure Save_References (N : Node_Id);
11479 -- This is the recursive procedure that does the work, once the
11480 -- enclosing generic scope has been established.
11486 function Is_Global (E : Entity_Id) return Boolean is
11489 function Is_Instance_Node (Decl : Node_Id) return Boolean;
11490 -- Determine whether the parent node of a reference to a child unit
11491 -- denotes an instantiation or a formal package, in which case the
11492 -- reference to the child unit is global, even if it appears within
11493 -- the current scope (e.g. when the instance appears within the body
11494 -- of an ancestor).
11496 ----------------------
11497 -- Is_Instance_Node --
11498 ----------------------
11500 function Is_Instance_Node (Decl : Node_Id) return Boolean is
11502 return Nkind (Decl) in N_Generic_Instantiation
11504 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
11505 end Is_Instance_Node;
11507 -- Start of processing for Is_Global
11510 if E = Gen_Scope then
11513 elsif E = Standard_Standard then
11516 elsif Is_Child_Unit (E)
11517 and then (Is_Instance_Node (Parent (N2))
11518 or else (Nkind (Parent (N2)) = N_Expanded_Name
11519 and then N2 = Selector_Name (Parent (N2))
11521 Is_Instance_Node (Parent (Parent (N2)))))
11527 while Se /= Gen_Scope loop
11528 if Se = Standard_Standard then
11543 procedure Reset_Entity (N : Node_Id) is
11545 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
11546 -- If the type of N2 is global to the generic unit. Save the type in
11547 -- the generic node.
11548 -- What does this comment mean???
11550 function Top_Ancestor (E : Entity_Id) return Entity_Id;
11551 -- Find the ultimate ancestor of the current unit. If it is not a
11552 -- generic unit, then the name of the current unit in the prefix of
11553 -- an expanded name must be replaced with its generic homonym to
11554 -- ensure that it will be properly resolved in an instance.
11556 ---------------------
11557 -- Set_Global_Type --
11558 ---------------------
11560 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
11561 Typ : constant Entity_Id := Etype (N2);
11564 Set_Etype (N, Typ);
11566 if Entity (N) /= N2
11567 and then Has_Private_View (Entity (N))
11569 -- If the entity of N is not the associated node, this is a
11570 -- nested generic and it has an associated node as well, whose
11571 -- type is already the full view (see below). Indicate that the
11572 -- original node has a private view.
11574 Set_Has_Private_View (N);
11577 -- If not a private type, nothing else to do
11579 if not Is_Private_Type (Typ) then
11580 if Is_Array_Type (Typ)
11581 and then Is_Private_Type (Component_Type (Typ))
11583 Set_Has_Private_View (N);
11586 -- If it is a derivation of a private type in a context where no
11587 -- full view is needed, nothing to do either.
11589 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
11592 -- Otherwise mark the type for flipping and use the full view when
11596 Set_Has_Private_View (N);
11598 if Present (Full_View (Typ)) then
11599 Set_Etype (N2, Full_View (Typ));
11602 end Set_Global_Type;
11608 function Top_Ancestor (E : Entity_Id) return Entity_Id is
11613 while Is_Child_Unit (Par) loop
11614 Par := Scope (Par);
11620 -- Start of processing for Reset_Entity
11623 N2 := Get_Associated_Node (N);
11626 -- If the entity is an itype created as a subtype of an access type
11627 -- with a null exclusion restore source entity for proper visibility.
11628 -- The itype will be created anew in the instance.
11630 if Present (E) then
11632 and then Ekind (E) = E_Access_Subtype
11633 and then Is_Entity_Name (N)
11634 and then Chars (Etype (E)) = Chars (N)
11637 Set_Entity (N2, E);
11641 if Is_Global (E) then
11642 Set_Global_Type (N, N2);
11644 elsif Nkind (N) = N_Op_Concat
11645 and then Is_Generic_Type (Etype (N2))
11646 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
11648 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
11649 and then Is_Intrinsic_Subprogram (E)
11654 -- Entity is local. Mark generic node as unresolved.
11655 -- Note that now it does not have an entity.
11657 Set_Associated_Node (N, Empty);
11658 Set_Etype (N, Empty);
11661 if Nkind (Parent (N)) in N_Generic_Instantiation
11662 and then N = Name (Parent (N))
11664 Save_Global_Defaults (Parent (N), Parent (N2));
11667 elsif Nkind (Parent (N)) = N_Selected_Component
11668 and then Nkind (Parent (N2)) = N_Expanded_Name
11670 if Is_Global (Entity (Parent (N2))) then
11671 Change_Selected_Component_To_Expanded_Name (Parent (N));
11672 Set_Associated_Node (Parent (N), Parent (N2));
11673 Set_Global_Type (Parent (N), Parent (N2));
11674 Save_Entity_Descendants (N);
11676 -- If this is a reference to the current generic entity, replace
11677 -- by the name of the generic homonym of the current package. This
11678 -- is because in an instantiation Par.P.Q will not resolve to the
11679 -- name of the instance, whose enclosing scope is not necessarily
11680 -- Par. We use the generic homonym rather that the name of the
11681 -- generic itself because it may be hidden by a local declaration.
11683 elsif In_Open_Scopes (Entity (Parent (N2)))
11685 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
11687 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
11688 Rewrite (Parent (N),
11689 Make_Identifier (Sloc (N),
11691 Chars (Generic_Homonym (Entity (Parent (N2))))));
11693 Rewrite (Parent (N),
11694 Make_Identifier (Sloc (N),
11695 Chars => Chars (Selector_Name (Parent (N2)))));
11699 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
11700 and then Parent (N) = Name (Parent (Parent (N)))
11702 Save_Global_Defaults
11703 (Parent (Parent (N)), Parent (Parent ((N2))));
11706 -- A selected component may denote a static constant that has been
11707 -- folded. If the static constant is global to the generic, capture
11708 -- its value. Otherwise the folding will happen in any instantiation.
11710 elsif Nkind (Parent (N)) = N_Selected_Component
11711 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
11713 if Present (Entity (Original_Node (Parent (N2))))
11714 and then Is_Global (Entity (Original_Node (Parent (N2))))
11716 Rewrite (Parent (N), New_Copy (Parent (N2)));
11717 Set_Analyzed (Parent (N), False);
11723 -- A selected component may be transformed into a parameterless
11724 -- function call. If the called entity is global, rewrite the node
11725 -- appropriately, i.e. as an extended name for the global entity.
11727 elsif Nkind (Parent (N)) = N_Selected_Component
11728 and then Nkind (Parent (N2)) = N_Function_Call
11729 and then N = Selector_Name (Parent (N))
11731 if No (Parameter_Associations (Parent (N2))) then
11732 if Is_Global (Entity (Name (Parent (N2)))) then
11733 Change_Selected_Component_To_Expanded_Name (Parent (N));
11734 Set_Associated_Node (Parent (N), Name (Parent (N2)));
11735 Set_Global_Type (Parent (N), Name (Parent (N2)));
11736 Save_Entity_Descendants (N);
11739 Set_Associated_Node (N, Empty);
11740 Set_Etype (N, Empty);
11743 -- In Ada 2005, X.F may be a call to a primitive operation,
11744 -- rewritten as F (X). This rewriting will be done again in an
11745 -- instance, so keep the original node. Global entities will be
11746 -- captured as for other constructs.
11752 -- Entity is local. Reset in generic unit, so that node is resolved
11753 -- anew at the point of instantiation.
11756 Set_Associated_Node (N, Empty);
11757 Set_Etype (N, Empty);
11761 -----------------------------
11762 -- Save_Entity_Descendants --
11763 -----------------------------
11765 procedure Save_Entity_Descendants (N : Node_Id) is
11768 when N_Binary_Op =>
11769 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
11770 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11773 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11775 when N_Expanded_Name | N_Selected_Component =>
11776 Save_Global_Descendant (Union_Id (Prefix (N)));
11777 Save_Global_Descendant (Union_Id (Selector_Name (N)));
11779 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
11783 raise Program_Error;
11785 end Save_Entity_Descendants;
11787 --------------------------
11788 -- Save_Global_Defaults --
11789 --------------------------
11791 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
11792 Loc : constant Source_Ptr := Sloc (N1);
11793 Assoc2 : constant List_Id := Generic_Associations (N2);
11794 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
11801 Actual : Entity_Id;
11804 Assoc1 := Generic_Associations (N1);
11806 if Present (Assoc1) then
11807 Act1 := First (Assoc1);
11810 Set_Generic_Associations (N1, New_List);
11811 Assoc1 := Generic_Associations (N1);
11814 if Present (Assoc2) then
11815 Act2 := First (Assoc2);
11820 while Present (Act1) and then Present (Act2) loop
11825 -- Find the associations added for default subprograms
11827 if Present (Act2) then
11828 while Nkind (Act2) /= N_Generic_Association
11829 or else No (Entity (Selector_Name (Act2)))
11830 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
11835 -- Add a similar association if the default is global. The
11836 -- renaming declaration for the actual has been analyzed, and
11837 -- its alias is the program it renames. Link the actual in the
11838 -- original generic tree with the node in the analyzed tree.
11840 while Present (Act2) loop
11841 Subp := Entity (Selector_Name (Act2));
11842 Def := Explicit_Generic_Actual_Parameter (Act2);
11844 -- Following test is defence against rubbish errors
11846 if No (Alias (Subp)) then
11850 -- Retrieve the resolved actual from the renaming declaration
11851 -- created for the instantiated formal.
11853 Actual := Entity (Name (Parent (Parent (Subp))));
11854 Set_Entity (Def, Actual);
11855 Set_Etype (Def, Etype (Actual));
11857 if Is_Global (Actual) then
11859 Make_Generic_Association (Loc,
11860 Selector_Name => New_Occurrence_Of (Subp, Loc),
11861 Explicit_Generic_Actual_Parameter =>
11862 New_Occurrence_Of (Actual, Loc));
11864 Set_Associated_Node
11865 (Explicit_Generic_Actual_Parameter (Ndec), Def);
11867 Append (Ndec, Assoc1);
11869 -- If there are other defaults, add a dummy association in case
11870 -- there are other defaulted formals with the same name.
11872 elsif Present (Next (Act2)) then
11874 Make_Generic_Association (Loc,
11875 Selector_Name => New_Occurrence_Of (Subp, Loc),
11876 Explicit_Generic_Actual_Parameter => Empty);
11878 Append (Ndec, Assoc1);
11885 if Nkind (Name (N1)) = N_Identifier
11886 and then Is_Child_Unit (Gen_Id)
11887 and then Is_Global (Gen_Id)
11888 and then Is_Generic_Unit (Scope (Gen_Id))
11889 and then In_Open_Scopes (Scope (Gen_Id))
11891 -- This is an instantiation of a child unit within a sibling, so
11892 -- that the generic parent is in scope. An eventual instance must
11893 -- occur within the scope of an instance of the parent. Make name
11894 -- in instance into an expanded name, to preserve the identifier
11895 -- of the parent, so it can be resolved subsequently.
11897 Rewrite (Name (N2),
11898 Make_Expanded_Name (Loc,
11899 Chars => Chars (Gen_Id),
11900 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11901 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11902 Set_Entity (Name (N2), Gen_Id);
11904 Rewrite (Name (N1),
11905 Make_Expanded_Name (Loc,
11906 Chars => Chars (Gen_Id),
11907 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11908 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11910 Set_Associated_Node (Name (N1), Name (N2));
11911 Set_Associated_Node (Prefix (Name (N1)), Empty);
11912 Set_Associated_Node
11913 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
11914 Set_Etype (Name (N1), Etype (Gen_Id));
11917 end Save_Global_Defaults;
11919 ----------------------------
11920 -- Save_Global_Descendant --
11921 ----------------------------
11923 procedure Save_Global_Descendant (D : Union_Id) is
11927 if D in Node_Range then
11928 if D = Union_Id (Empty) then
11931 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
11932 Save_References (Node_Id (D));
11935 elsif D in List_Range then
11936 if D = Union_Id (No_List)
11937 or else Is_Empty_List (List_Id (D))
11942 N1 := First (List_Id (D));
11943 while Present (N1) loop
11944 Save_References (N1);
11949 -- Element list or other non-node field, nothing to do
11954 end Save_Global_Descendant;
11956 ---------------------
11957 -- Save_References --
11958 ---------------------
11960 -- This is the recursive procedure that does the work once the enclosing
11961 -- generic scope has been established. We have to treat specially a
11962 -- number of node rewritings that are required by semantic processing
11963 -- and which change the kind of nodes in the generic copy: typically
11964 -- constant-folding, replacing an operator node by a string literal, or
11965 -- a selected component by an expanded name. In each of those cases, the
11966 -- transformation is propagated to the generic unit.
11968 procedure Save_References (N : Node_Id) is
11969 Loc : constant Source_Ptr := Sloc (N);
11975 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
11976 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11979 elsif Nkind (N) = N_Operator_Symbol
11980 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
11982 Change_Operator_Symbol_To_String_Literal (N);
11985 elsif Nkind (N) in N_Op then
11986 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11987 if Nkind (N) = N_Op_Concat then
11988 Set_Is_Component_Left_Opnd (N,
11989 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11991 Set_Is_Component_Right_Opnd (N,
11992 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11998 -- Node may be transformed into call to a user-defined operator
12000 N2 := Get_Associated_Node (N);
12002 if Nkind (N2) = N_Function_Call then
12003 E := Entity (Name (N2));
12006 and then Is_Global (E)
12008 Set_Etype (N, Etype (N2));
12010 Set_Associated_Node (N, Empty);
12011 Set_Etype (N, Empty);
12014 elsif Nkind_In (N2, N_Integer_Literal,
12018 if Present (Original_Node (N2))
12019 and then Nkind (Original_Node (N2)) = Nkind (N)
12022 -- Operation was constant-folded. Whenever possible,
12023 -- recover semantic information from unfolded node,
12026 Set_Associated_Node (N, Original_Node (N2));
12028 if Nkind (N) = N_Op_Concat then
12029 Set_Is_Component_Left_Opnd (N,
12030 Is_Component_Left_Opnd (Get_Associated_Node (N)));
12031 Set_Is_Component_Right_Opnd (N,
12032 Is_Component_Right_Opnd (Get_Associated_Node (N)));
12038 -- If original node is already modified, propagate
12039 -- constant-folding to template.
12041 Rewrite (N, New_Copy (N2));
12042 Set_Analyzed (N, False);
12045 elsif Nkind (N2) = N_Identifier
12046 and then Ekind (Entity (N2)) = E_Enumeration_Literal
12048 -- Same if call was folded into a literal, but in this case
12049 -- retain the entity to avoid spurious ambiguities if it is
12050 -- overloaded at the point of instantiation or inlining.
12052 Rewrite (N, New_Copy (N2));
12053 Set_Analyzed (N, False);
12057 -- Complete operands check if node has not been constant-folded
12059 if Nkind (N) in N_Op then
12060 Save_Entity_Descendants (N);
12063 elsif Nkind (N) = N_Identifier then
12064 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
12066 -- If this is a discriminant reference, always save it. It is
12067 -- used in the instance to find the corresponding discriminant
12068 -- positionally rather than by name.
12070 Set_Original_Discriminant
12071 (N, Original_Discriminant (Get_Associated_Node (N)));
12075 N2 := Get_Associated_Node (N);
12077 if Nkind (N2) = N_Function_Call then
12078 E := Entity (Name (N2));
12080 -- Name resolves to a call to parameterless function. If
12081 -- original entity is global, mark node as resolved.
12084 and then Is_Global (E)
12086 Set_Etype (N, Etype (N2));
12088 Set_Associated_Node (N, Empty);
12089 Set_Etype (N, Empty);
12092 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
12093 and then Is_Entity_Name (Original_Node (N2))
12095 -- Name resolves to named number that is constant-folded,
12096 -- We must preserve the original name for ASIS use, and
12097 -- undo the constant-folding, which will be repeated in
12100 Set_Associated_Node (N, Original_Node (N2));
12103 elsif Nkind (N2) = N_String_Literal then
12105 -- Name resolves to string literal. Perform the same
12106 -- replacement in generic.
12108 Rewrite (N, New_Copy (N2));
12110 elsif Nkind (N2) = N_Explicit_Dereference then
12112 -- An identifier is rewritten as a dereference if it is the
12113 -- prefix in an implicit dereference (call or attribute).
12114 -- The analysis of an instantiation will expand the node
12115 -- again, so we preserve the original tree but link it to
12116 -- the resolved entity in case it is global.
12118 if Is_Entity_Name (Prefix (N2))
12119 and then Present (Entity (Prefix (N2)))
12120 and then Is_Global (Entity (Prefix (N2)))
12122 Set_Associated_Node (N, Prefix (N2));
12124 elsif Nkind (Prefix (N2)) = N_Function_Call
12125 and then Is_Global (Entity (Name (Prefix (N2))))
12128 Make_Explicit_Dereference (Loc,
12129 Prefix => Make_Function_Call (Loc,
12131 New_Occurrence_Of (Entity (Name (Prefix (N2))),
12135 Set_Associated_Node (N, Empty);
12136 Set_Etype (N, Empty);
12139 -- The subtype mark of a nominally unconstrained object is
12140 -- rewritten as a subtype indication using the bounds of the
12141 -- expression. Recover the original subtype mark.
12143 elsif Nkind (N2) = N_Subtype_Indication
12144 and then Is_Entity_Name (Original_Node (N2))
12146 Set_Associated_Node (N, Original_Node (N2));
12154 elsif Nkind (N) in N_Entity then
12159 Qual : Node_Id := Empty;
12160 Typ : Entity_Id := Empty;
12163 use Atree.Unchecked_Access;
12164 -- This code section is part of implementing an untyped tree
12165 -- traversal, so it needs direct access to node fields.
12168 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
12169 N2 := Get_Associated_Node (N);
12176 -- In an instance within a generic, use the name of the
12177 -- actual and not the original generic parameter. If the
12178 -- actual is global in the current generic it must be
12179 -- preserved for its instantiation.
12181 if Nkind (Parent (Typ)) = N_Subtype_Declaration
12183 Present (Generic_Parent_Type (Parent (Typ)))
12185 Typ := Base_Type (Typ);
12186 Set_Etype (N2, Typ);
12192 or else not Is_Global (Typ)
12194 Set_Associated_Node (N, Empty);
12196 -- If the aggregate is an actual in a call, it has been
12197 -- resolved in the current context, to some local type.
12198 -- The enclosing call may have been disambiguated by the
12199 -- aggregate, and this disambiguation might fail at
12200 -- instantiation time because the type to which the
12201 -- aggregate did resolve is not preserved. In order to
12202 -- preserve some of this information, we wrap the
12203 -- aggregate in a qualified expression, using the id of
12204 -- its type. For further disambiguation we qualify the
12205 -- type name with its scope (if visible) because both
12206 -- id's will have corresponding entities in an instance.
12207 -- This resolves most of the problems with missing type
12208 -- information on aggregates in instances.
12210 if Nkind (N2) = Nkind (N)
12212 Nkind_In (Parent (N2), N_Procedure_Call_Statement,
12214 and then Comes_From_Source (Typ)
12216 if Is_Immediately_Visible (Scope (Typ)) then
12217 Nam := Make_Selected_Component (Loc,
12219 Make_Identifier (Loc, Chars (Scope (Typ))),
12221 Make_Identifier (Loc, Chars (Typ)));
12223 Nam := Make_Identifier (Loc, Chars (Typ));
12227 Make_Qualified_Expression (Loc,
12228 Subtype_Mark => Nam,
12229 Expression => Relocate_Node (N));
12233 Save_Global_Descendant (Field1 (N));
12234 Save_Global_Descendant (Field2 (N));
12235 Save_Global_Descendant (Field3 (N));
12236 Save_Global_Descendant (Field5 (N));
12238 if Present (Qual) then
12242 -- All other cases than aggregates
12245 -- For pragmas, we propagate the Enabled status for the
12246 -- relevant pragmas to the original generic tree. This was
12247 -- originally needed for SCO generation. It is no longer
12248 -- needed there (since we use the Sloc value in calls to
12249 -- Set_SCO_Pragma_Enabled), but it seems a generally good
12250 -- idea to have this flag set properly.
12252 if Nkind (N) = N_Pragma
12254 (Pragma_Name (N) = Name_Assert or else
12255 Pragma_Name (N) = Name_Check or else
12256 Pragma_Name (N) = Name_Precondition or else
12257 Pragma_Name (N) = Name_Postcondition)
12258 and then Present (Associated_Node (Pragma_Identifier (N)))
12260 Set_Pragma_Enabled (N,
12262 (Parent (Associated_Node (Pragma_Identifier (N)))));
12265 Save_Global_Descendant (Field1 (N));
12266 Save_Global_Descendant (Field2 (N));
12267 Save_Global_Descendant (Field3 (N));
12268 Save_Global_Descendant (Field4 (N));
12269 Save_Global_Descendant (Field5 (N));
12273 end Save_References;
12275 -- Start of processing for Save_Global_References
12278 Gen_Scope := Current_Scope;
12280 -- If the generic unit is a child unit, references to entities in the
12281 -- parent are treated as local, because they will be resolved anew in
12282 -- the context of the instance of the parent.
12284 while Is_Child_Unit (Gen_Scope)
12285 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
12287 Gen_Scope := Scope (Gen_Scope);
12290 Save_References (N);
12291 end Save_Global_References;
12293 --------------------------------------
12294 -- Set_Copied_Sloc_For_Inlined_Body --
12295 --------------------------------------
12297 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
12299 Create_Instantiation_Source (N, E, True, S_Adjustment);
12300 end Set_Copied_Sloc_For_Inlined_Body;
12302 ---------------------
12303 -- Set_Instance_Of --
12304 ---------------------
12306 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
12308 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
12309 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
12310 Generic_Renamings.Increment_Last;
12311 end Set_Instance_Of;
12313 --------------------
12314 -- Set_Next_Assoc --
12315 --------------------
12317 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
12319 Generic_Renamings.Table (E).Next_In_HTable := Next;
12320 end Set_Next_Assoc;
12322 -------------------
12323 -- Start_Generic --
12324 -------------------
12326 procedure Start_Generic is
12328 -- ??? More things could be factored out in this routine.
12329 -- Should probably be done at a later stage.
12331 Generic_Flags.Append (Inside_A_Generic);
12332 Inside_A_Generic := True;
12334 Expander_Mode_Save_And_Set (False);
12337 ----------------------
12338 -- Set_Instance_Env --
12339 ----------------------
12341 procedure Set_Instance_Env
12342 (Gen_Unit : Entity_Id;
12343 Act_Unit : Entity_Id)
12346 -- Regardless of the current mode, predefined units are analyzed in the
12347 -- most current Ada mode, and earlier version Ada checks do not apply
12348 -- to predefined units. Nothing needs to be done for non-internal units.
12349 -- These are always analyzed in the current mode.
12351 if Is_Internal_File_Name
12352 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
12353 Renamings_Included => True)
12355 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
12358 Current_Instantiated_Parent :=
12359 (Gen_Id => Gen_Unit,
12360 Act_Id => Act_Unit,
12361 Next_In_HTable => Assoc_Null);
12362 end Set_Instance_Env;
12368 procedure Switch_View (T : Entity_Id) is
12369 BT : constant Entity_Id := Base_Type (T);
12370 Priv_Elmt : Elmt_Id := No_Elmt;
12371 Priv_Sub : Entity_Id;
12374 -- T may be private but its base type may have been exchanged through
12375 -- some other occurrence, in which case there is nothing to switch
12376 -- besides T itself. Note that a private dependent subtype of a private
12377 -- type might not have been switched even if the base type has been,
12378 -- because of the last branch of Check_Private_View (see comment there).
12380 if not Is_Private_Type (BT) then
12381 Prepend_Elmt (Full_View (T), Exchanged_Views);
12382 Exchange_Declarations (T);
12386 Priv_Elmt := First_Elmt (Private_Dependents (BT));
12388 if Present (Full_View (BT)) then
12389 Prepend_Elmt (Full_View (BT), Exchanged_Views);
12390 Exchange_Declarations (BT);
12393 while Present (Priv_Elmt) loop
12394 Priv_Sub := (Node (Priv_Elmt));
12396 -- We avoid flipping the subtype if the Etype of its full view is
12397 -- private because this would result in a malformed subtype. This
12398 -- occurs when the Etype of the subtype full view is the full view of
12399 -- the base type (and since the base types were just switched, the
12400 -- subtype is pointing to the wrong view). This is currently the case
12401 -- for tagged record types, access types (maybe more?) and needs to
12402 -- be resolved. ???
12404 if Present (Full_View (Priv_Sub))
12405 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
12407 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
12408 Exchange_Declarations (Priv_Sub);
12411 Next_Elmt (Priv_Elmt);
12415 -----------------------------
12416 -- Valid_Default_Attribute --
12417 -----------------------------
12419 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
12420 Attr_Id : constant Attribute_Id :=
12421 Get_Attribute_Id (Attribute_Name (Def));
12422 T : constant Entity_Id := Entity (Prefix (Def));
12423 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
12436 F := First_Formal (Nam);
12437 while Present (F) loop
12438 Num_F := Num_F + 1;
12443 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12444 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12445 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12446 Attribute_Unbiased_Rounding =>
12449 and then Is_Floating_Point_Type (T);
12451 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12452 Attribute_Value | Attribute_Wide_Image |
12453 Attribute_Wide_Value =>
12454 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
12456 when Attribute_Max | Attribute_Min =>
12457 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
12459 when Attribute_Input =>
12460 OK := (Is_Fun and then Num_F = 1);
12462 when Attribute_Output | Attribute_Read | Attribute_Write =>
12463 OK := (not Is_Fun and then Num_F = 2);
12470 Error_Msg_N ("attribute reference has wrong profile for subprogram",
12473 end Valid_Default_Attribute;
OSDN Git Service
