1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Einfo; use Einfo;
28 with Elists; use Elists;
29 with Errout; use Errout;
30 with Expander; use Expander;
31 with Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Freeze; use Freeze;
36 with Lib.Load; use Lib.Load;
37 with Lib.Xref; use Lib.Xref;
38 with Nlists; use Nlists;
39 with Namet; use Namet;
40 with Nmake; use Nmake;
42 with Rident; use Rident;
43 with Restrict; use Restrict;
44 with Rtsfind; use Rtsfind;
46 with Sem_Cat; use Sem_Cat;
47 with Sem_Ch3; use Sem_Ch3;
48 with Sem_Ch6; use Sem_Ch6;
49 with Sem_Ch7; use Sem_Ch7;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Ch10; use Sem_Ch10;
52 with Sem_Ch13; use Sem_Ch13;
53 with Sem_Disp; use Sem_Disp;
54 with Sem_Elab; use Sem_Elab;
55 with Sem_Elim; use Sem_Elim;
56 with Sem_Eval; use Sem_Eval;
57 with Sem_Res; use Sem_Res;
58 with Sem_Type; use Sem_Type;
59 with Sem_Util; use Sem_Util;
60 with Sem_Warn; use Sem_Warn;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 ----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to share
83 -- generic instantiations (for now). Analysis of a generic definition does
84 -- not perform any expansion action, but the expander must be called on the
85 -- tree for each instantiation, because the expansion may of course depend
86 -- on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is static
224 -- error which must be detected at compile time. The detection of these
225 -- circularities is carried out at the point that we insert a generic
226 -- instance spec or body. If there is a circularity, then the analysis of
227 -- the offending spec or body will eventually result in trying to load the
228 -- same unit again, and we detect this problem as we analyze the package
229 -- instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we get
232 -- into trouble if we try to keep going. The following flag is set if a
233 -- circularity is detected, and used to abandon compilation after the
234 -- messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -------------------------------------------------
241 -- Formal packages and partial parametrization --
242 -------------------------------------------------
244 -- When compiling a generic, a formal package is a local instantiation. If
245 -- declared with a box, its generic formals are visible in the enclosing
246 -- generic. If declared with a partial list of actuals, those actuals that
247 -- are defaulted (covered by an Others clause, or given an explicit box
248 -- initialization) are also visible in the enclosing generic, while those
249 -- that have a corresponding actual are not.
251 -- In our source model of instantiation, the same visibility must be
252 -- present in the spec and body of an instance: the names of the formals
253 -- that are defaulted must be made visible within the instance, and made
254 -- invisible (hidden) after the instantiation is complete, so that they
255 -- are not accessible outside of the instance.
257 -- In a generic, a formal package is treated like a special instantiation.
258 -- Our Ada95 compiler handled formals with and without box in different
259 -- ways. With partial parametrization, we use a single model for both.
260 -- We create a package declaration that consists of the specification of
261 -- the generic package, and a set of declarations that map the actuals
262 -- into local renamings, just as we do for bona fide instantiations. For
263 -- defaulted parameters and formals with a box, we copy directly the
264 -- declarations of the formal into this local package. The result is a
265 -- a package whose visible declarations may include generic formals. This
266 -- package is only used for type checking and visibility analysis, and
267 -- never reaches the back-end, so it can freely violate the placement
268 -- rules for generic formal declarations.
270 -- The list of declarations (renamings and copies of formals) is built
271 -- by Analyze_Associations, just as for regular instantiations.
273 -- At the point of instantiation, conformance checking must be applied only
274 -- to those parameters that were specified in the formal. We perform this
275 -- checking by creating another internal instantiation, this one including
276 -- only the renamings and the formals (the rest of the package spec is not
277 -- relevant to conformance checking). We can then traverse two lists: the
278 -- list of actuals in the instance that corresponds to the formal package,
279 -- and the list of actuals produced for this bogus instantiation. We apply
280 -- the conformance rules to those actuals that are not defaulted (i.e.
281 -- which still appear as generic formals.
283 -- When we compile an instance body we must make the right parameters
284 -- visible again. The predicate Is_Generic_Formal indicates which of the
285 -- formals should have its Is_Hidden flag reset.
287 -----------------------
288 -- Local subprograms --
289 -----------------------
291 procedure Abandon_Instantiation (N : Node_Id);
292 pragma No_Return (Abandon_Instantiation);
293 -- Posts an error message "instantiation abandoned" at the indicated node
294 -- and then raises the exception Instantiation_Error to do it.
296 procedure Analyze_Formal_Array_Type
297 (T : in out Entity_Id;
299 -- A formal array type is treated like an array type declaration, and
300 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
301 -- in-out, because in the case of an anonymous type the entity is
302 -- actually created in the procedure.
304 -- The following procedures treat other kinds of formal parameters
306 procedure Analyze_Formal_Derived_Interface_Type
311 procedure Analyze_Formal_Derived_Type
316 procedure Analyze_Formal_Interface_Type
321 -- The following subprograms create abbreviated declarations for formal
322 -- scalar types. We introduce an anonymous base of the proper class for
323 -- each of them, and define the formals as constrained first subtypes of
324 -- their bases. The bounds are expressions that are non-static in the
327 procedure Analyze_Formal_Decimal_Fixed_Point_Type
328 (T : Entity_Id; Def : Node_Id);
329 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
330 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
331 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
332 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
333 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
334 (T : Entity_Id; Def : Node_Id);
336 procedure Analyze_Formal_Private_Type
340 -- Creates a new private type, which does not require completion
342 procedure Analyze_Generic_Formal_Part (N : Node_Id);
344 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
345 -- Create a new access type with the given designated type
347 function Analyze_Associations
350 F_Copy : List_Id) return List_Id;
351 -- At instantiation time, build the list of associations between formals
352 -- and actuals. Each association becomes a renaming declaration for the
353 -- formal entity. F_Copy is the analyzed list of formals in the generic
354 -- copy. It is used to apply legality checks to the actuals. I_Node is the
355 -- instantiation node itself.
357 procedure Analyze_Subprogram_Instantiation
361 procedure Build_Instance_Compilation_Unit_Nodes
365 -- This procedure is used in the case where the generic instance of a
366 -- subprogram body or package body is a library unit. In this case, the
367 -- original library unit node for the generic instantiation must be
368 -- replaced by the resulting generic body, and a link made to a new
369 -- compilation unit node for the generic declaration. The argument N is
370 -- the original generic instantiation. Act_Body and Act_Decl are the body
371 -- and declaration of the instance (either package body and declaration
372 -- nodes or subprogram body and declaration nodes depending on the case).
373 -- On return, the node N has been rewritten with the actual body.
375 procedure Check_Access_Definition (N : Node_Id);
376 -- Subsidiary routine to null exclusion processing. Perform an assertion
377 -- check on Ada version and the presence of an access definition in N.
379 procedure Check_Formal_Packages (P_Id : Entity_Id);
380 -- Apply the following to all formal packages in generic associations
382 procedure Check_Formal_Package_Instance
383 (Formal_Pack : Entity_Id;
384 Actual_Pack : Entity_Id);
385 -- Verify that the actuals of the actual instance match the actuals of
386 -- the template for a formal package that is not declared with a box.
388 procedure Check_Forward_Instantiation (Decl : Node_Id);
389 -- If the generic is a local entity and the corresponding body has not
390 -- been seen yet, flag enclosing packages to indicate that it will be
391 -- elaborated after the generic body. Subprograms declared in the same
392 -- package cannot be inlined by the front-end because front-end inlining
393 -- requires a strict linear order of elaboration.
395 procedure Check_Hidden_Child_Unit
397 Gen_Unit : Entity_Id;
398 Act_Decl_Id : Entity_Id);
399 -- If the generic unit is an implicit child instance within a parent
400 -- instance, we need to make an explicit test that it is not hidden by
401 -- a child instance of the same name and parent.
403 procedure Check_Generic_Actuals
404 (Instance : Entity_Id;
405 Is_Formal_Box : Boolean);
406 -- Similar to previous one. Check the actuals in the instantiation,
407 -- whose views can change between the point of instantiation and the point
408 -- of instantiation of the body. In addition, mark the generic renamings
409 -- as generic actuals, so that they are not compatible with other actuals.
410 -- Recurse on an actual that is a formal package whose declaration has
413 function Contains_Instance_Of
416 N : Node_Id) return Boolean;
417 -- Inner is instantiated within the generic Outer. Check whether Inner
418 -- directly or indirectly contains an instance of Outer or of one of its
419 -- parents, in the case of a subunit. Each generic unit holds a list of
420 -- the entities instantiated within (at any depth). This procedure
421 -- determines whether the set of such lists contains a cycle, i.e. an
422 -- illegal circular instantiation.
424 function Denotes_Formal_Package
426 On_Exit : Boolean := False) return Boolean;
427 -- Returns True if E is a formal package of an enclosing generic, or
428 -- the actual for such a formal in an enclosing instantiation. If such
429 -- a package is used as a formal in an nested generic, or as an actual
430 -- in a nested instantiation, the visibility of ITS formals should not
431 -- be modified. When called from within Restore_Private_Views, the flag
432 -- On_Exit is true, to indicate that the search for a possible enclosing
433 -- instance should ignore the current one.
435 function Find_Actual_Type
437 Gen_Scope : Entity_Id) return Entity_Id;
438 -- When validating the actual types of a child instance, check whether
439 -- the formal is a formal type of the parent unit, and retrieve the current
440 -- actual for it. Typ is the entity in the analyzed formal type declaration
441 -- (component or index type of an array type, or designated type of an
442 -- access formal) and Gen_Scope is the scope of the analyzed formal array
443 -- or access type. The desired actual may be a formal of a parent, or may
444 -- be declared in a formal package of a parent. In both cases it is a
445 -- generic actual type because it appears within a visible instance.
446 -- Ambiguities may still arise if two homonyms are declared in two formal
447 -- packages, and the prefix of the formal type may be needed to resolve
448 -- the ambiguity in the instance ???
450 function In_Same_Declarative_Part
452 Inst : Node_Id) return Boolean;
453 -- True if the instantiation Inst and the given freeze_node F_Node appear
454 -- within the same declarative part, ignoring subunits, but with no inter-
455 -- vening suprograms or concurrent units. If true, the freeze node
456 -- of the instance can be placed after the freeze node of the parent,
457 -- which it itself an instance.
459 function In_Main_Context (E : Entity_Id) return Boolean;
460 -- Check whether an instantiation is in the context of the main unit.
461 -- Used to determine whether its body should be elaborated to allow
462 -- front-end inlining.
464 function Is_Generic_Formal (E : Entity_Id) return Boolean;
465 -- Utility to determine whether a given entity is declared by means of
466 -- of a formal parameter declaration. Used to set properly the visiblity
467 -- of generic formals of a generic package declared with a box or with
468 -- partial parametrization.
470 procedure Set_Instance_Env
471 (Gen_Unit : Entity_Id;
472 Act_Unit : Entity_Id);
473 -- Save current instance on saved environment, to be used to determine
474 -- the global status of entities in nested instances. Part of Save_Env.
475 -- called after verifying that the generic unit is legal for the instance,
476 -- The procedure also examines whether the generic unit is a predefined
477 -- unit, in order to set configuration switches accordingly. As a result
478 -- the procedure must be called after analyzing and freezing the actuals.
480 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
481 -- Associate analyzed generic parameter with corresponding
482 -- instance. Used for semantic checks at instantiation time.
484 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
485 -- Traverse the Exchanged_Views list to see if a type was private
486 -- and has already been flipped during this phase of instantiation.
488 procedure Hide_Current_Scope;
489 -- When compiling a generic child unit, the parent context must be
490 -- present, but the instance and all entities that may be generated
491 -- must be inserted in the current scope. We leave the current scope
492 -- on the stack, but make its entities invisible to avoid visibility
493 -- problems. This is reversed at the end of instantiations. This is
494 -- not done for the instantiation of the bodies, which only require the
495 -- instances of the generic parents to be in scope.
497 procedure Install_Body
502 -- If the instantiation happens textually before the body of the generic,
503 -- the instantiation of the body must be analyzed after the generic body,
504 -- and not at the point of instantiation. Such early instantiations can
505 -- happen if the generic and the instance appear in a package declaration
506 -- because the generic body can only appear in the corresponding package
507 -- body. Early instantiations can also appear if generic, instance and
508 -- body are all in the declarative part of a subprogram or entry. Entities
509 -- of packages that are early instantiations are delayed, and their freeze
510 -- node appears after the generic body.
512 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
513 -- Insert freeze node at the end of the declarative part that includes the
514 -- instance node N. If N is in the visible part of an enclosing package
515 -- declaration, the freeze node has to be inserted at the end of the
516 -- private declarations, if any.
518 procedure Freeze_Subprogram_Body
519 (Inst_Node : Node_Id;
521 Pack_Id : Entity_Id);
522 -- The generic body may appear textually after the instance, including
523 -- in the proper body of a stub, or within a different package instance.
524 -- Given that the instance can only be elaborated after the generic, we
525 -- place freeze_nodes for the instance and/or for packages that may enclose
526 -- the instance and the generic, so that the back-end can establish the
527 -- proper order of elaboration.
530 -- Establish environment for subsequent instantiation. Separated from
531 -- Save_Env because data-structures for visibility handling must be
532 -- initialized before call to Check_Generic_Child_Unit.
534 procedure Install_Formal_Packages (Par : Entity_Id);
535 -- If any of the formals of the parent are formal packages with box,
536 -- their formal parts are visible in the parent and thus in the child
537 -- unit as well. Analogous to what is done in Check_Generic_Actuals
538 -- for the unit itself. This procedure is also used in an instance, to
539 -- make visible the proper entities of the actual for a formal package
540 -- declared with a box.
542 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
543 -- When compiling an instance of a child unit the parent (which is
544 -- itself an instance) is an enclosing scope that must be made
545 -- immediately visible. This procedure is also used to install the non-
546 -- generic parent of a generic child unit when compiling its body, so
547 -- that full views of types in the parent are made visible.
549 procedure Remove_Parent (In_Body : Boolean := False);
550 -- Reverse effect after instantiation of child is complete
552 procedure Inline_Instance_Body
554 Gen_Unit : Entity_Id;
556 -- If front-end inlining is requested, instantiate the package body,
557 -- and preserve the visibility of its compilation unit, to insure
558 -- that successive instantiations succeed.
560 -- The functions Instantiate_XXX perform various legality checks and build
561 -- the declarations for instantiated generic parameters. In all of these
562 -- Formal is the entity in the generic unit, Actual is the entity of
563 -- expression in the generic associations, and Analyzed_Formal is the
564 -- formal in the generic copy, which contains the semantic information to
565 -- be used to validate the actual.
567 function Instantiate_Object
570 Analyzed_Formal : Node_Id) return List_Id;
572 function Instantiate_Type
575 Analyzed_Formal : Node_Id;
576 Actual_Decls : List_Id) return List_Id;
578 function Instantiate_Formal_Subprogram
581 Analyzed_Formal : Node_Id) return Node_Id;
583 function Instantiate_Formal_Package
586 Analyzed_Formal : Node_Id) return List_Id;
587 -- If the formal package is declared with a box, special visibility rules
588 -- apply to its formals: they are in the visible part of the package. This
589 -- is true in the declarative region of the formal package, that is to say
590 -- in the enclosing generic or instantiation. For an instantiation, the
591 -- parameters of the formal package are made visible in an explicit step.
592 -- Furthermore, if the actual is a visible use_clause, these formals must
593 -- be made potentially use_visible as well. On exit from the enclosing
594 -- instantiation, the reverse must be done.
596 -- For a formal package declared without a box, there are conformance rules
597 -- that apply to the actuals in the generic declaration and the actuals of
598 -- the actual package in the enclosing instantiation. The simplest way to
599 -- apply these rules is to repeat the instantiation of the formal package
600 -- in the context of the enclosing instance, and compare the generic
601 -- associations of this instantiation with those of the actual package.
602 -- This internal instantiation only needs to contain the renamings of the
603 -- formals: the visible and private declarations themselves need not be
606 -- In Ada2005, the formal package may be only partially parametrized. In
607 -- that case the visibility step must make visible those actuals whose
608 -- corresponding formals were given with a box. A final complication
609 -- involves inherited operations from formal derived types, which must be
610 -- visible if the type is.
612 function Is_In_Main_Unit (N : Node_Id) return Boolean;
613 -- Test if given node is in the main unit
615 procedure Load_Parent_Of_Generic
618 Body_Optional : Boolean := False);
619 -- If the generic appears in a separate non-generic library unit, load the
620 -- corresponding body to retrieve the body of the generic. N is the node
621 -- for the generic instantiation, Spec is the generic package declaration.
623 -- Body_Optional is a flag that indicates that the body is being loaded to
624 -- ensure that temporaries are generated consistently when there are other
625 -- instances in the current declarative part that precede the one being
626 -- loaded. In that case a missing body is acceptable.
628 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
629 -- Add the context clause of the unit containing a generic unit to an
630 -- instantiation that is a compilation unit.
632 function Get_Associated_Node (N : Node_Id) return Node_Id;
633 -- In order to propagate semantic information back from the analyzed copy
634 -- to the original generic, we maintain links between selected nodes in the
635 -- generic and their corresponding copies. At the end of generic analysis,
636 -- the routine Save_Global_References traverses the generic tree, examines
637 -- the semantic information, and preserves the links to those nodes that
638 -- contain global information. At instantiation, the information from the
639 -- associated node is placed on the new copy, so that name resolution is
642 -- Three kinds of source nodes have associated nodes:
644 -- a) those that can reference (denote) entities, that is identifiers,
645 -- character literals, expanded_names, operator symbols, operators,
646 -- and attribute reference nodes. These nodes have an Entity field
647 -- and are the set of nodes that are in N_Has_Entity.
649 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
651 -- c) selected components (N_Selected_Component)
653 -- For the first class, the associated node preserves the entity if it is
654 -- global. If the generic contains nested instantiations, the associated
655 -- node itself has been recopied, and a chain of them must be followed.
657 -- For aggregates, the associated node allows retrieval of the type, which
658 -- may otherwise not appear in the generic. The view of this type may be
659 -- different between generic and instantiation, and the full view can be
660 -- installed before the instantiation is analyzed. For aggregates of type
661 -- extensions, the same view exchange may have to be performed for some of
662 -- the ancestor types, if their view is private at the point of
665 -- Nodes that are selected components in the parse tree may be rewritten
666 -- as expanded names after resolution, and must be treated as potential
667 -- entity holders. which is why they also have an Associated_Node.
669 -- Nodes that do not come from source, such as freeze nodes, do not appear
670 -- in the generic tree, and need not have an associated node.
672 -- The associated node is stored in the Associated_Node field. Note that
673 -- this field overlaps Entity, which is fine, because the whole point is
674 -- that we don't need or want the normal Entity field in this situation.
676 procedure Move_Freeze_Nodes
680 -- Freeze nodes can be generated in the analysis of a generic unit, but
681 -- will not be seen by the back-end. It is necessary to move those nodes
682 -- to the enclosing scope if they freeze an outer entity. We place them
683 -- at the end of the enclosing generic package, which is semantically
686 procedure Pre_Analyze_Actuals (N : Node_Id);
687 -- Analyze actuals to perform name resolution. Full resolution is done
688 -- later, when the expected types are known, but names have to be captured
689 -- before installing parents of generics, that are not visible for the
690 -- actuals themselves.
692 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
693 -- Verify that an attribute that appears as the default for a formal
694 -- subprogram is a function or procedure with the correct profile.
696 -------------------------------------------
697 -- Data Structures for Generic Renamings --
698 -------------------------------------------
700 -- The map Generic_Renamings associates generic entities with their
701 -- corresponding actuals. Currently used to validate type instances. It
702 -- will eventually be used for all generic parameters to eliminate the
703 -- need for overload resolution in the instance.
705 type Assoc_Ptr is new Int;
707 Assoc_Null : constant Assoc_Ptr := -1;
712 Next_In_HTable : Assoc_Ptr;
715 package Generic_Renamings is new Table.Table
716 (Table_Component_Type => Assoc,
717 Table_Index_Type => Assoc_Ptr,
718 Table_Low_Bound => 0,
720 Table_Increment => 100,
721 Table_Name => "Generic_Renamings");
723 -- Variable to hold enclosing instantiation. When the environment is
724 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
726 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
728 -- Hash table for associations
730 HTable_Size : constant := 37;
731 type HTable_Range is range 0 .. HTable_Size - 1;
733 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
734 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
735 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
736 function Hash (F : Entity_Id) return HTable_Range;
738 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
739 Header_Num => HTable_Range,
741 Elmt_Ptr => Assoc_Ptr,
742 Null_Ptr => Assoc_Null,
743 Set_Next => Set_Next_Assoc,
746 Get_Key => Get_Gen_Id,
750 Exchanged_Views : Elist_Id;
751 -- This list holds the private views that have been exchanged during
752 -- instantiation to restore the visibility of the generic declaration.
753 -- (see comments above). After instantiation, the current visibility is
754 -- reestablished by means of a traversal of this list.
756 Hidden_Entities : Elist_Id;
757 -- This list holds the entities of the current scope that are removed
758 -- from immediate visibility when instantiating a child unit. Their
759 -- visibility is restored in Remove_Parent.
761 -- Because instantiations can be recursive, the following must be saved
762 -- on entry and restored on exit from an instantiation (spec or body).
763 -- This is done by the two procedures Save_Env and Restore_Env. For
764 -- package and subprogram instantiations (but not for the body instances)
765 -- the action of Save_Env is done in two steps: Init_Env is called before
766 -- Check_Generic_Child_Unit, because setting the parent instances requires
767 -- that the visibility data structures be properly initialized. Once the
768 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
770 Parent_Unit_Visible : Boolean := False;
771 -- Parent_Unit_Visible is used when the generic is a child unit, and
772 -- indicates whether the ultimate parent of the generic is visible in the
773 -- instantiation environment. It is used to reset the visibility of the
774 -- parent at the end of the instantiation (see Remove_Parent).
776 Instance_Parent_Unit : Entity_Id := Empty;
777 -- This records the ultimate parent unit of an instance of a generic
778 -- child unit and is used in conjunction with Parent_Unit_Visible to
779 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
781 type Instance_Env is record
782 Instantiated_Parent : Assoc;
783 Exchanged_Views : Elist_Id;
784 Hidden_Entities : Elist_Id;
785 Current_Sem_Unit : Unit_Number_Type;
786 Parent_Unit_Visible : Boolean := False;
787 Instance_Parent_Unit : Entity_Id := Empty;
788 Switches : Config_Switches_Type;
791 package Instance_Envs is new Table.Table (
792 Table_Component_Type => Instance_Env,
793 Table_Index_Type => Int,
794 Table_Low_Bound => 0,
796 Table_Increment => 100,
797 Table_Name => "Instance_Envs");
799 procedure Restore_Private_Views
800 (Pack_Id : Entity_Id;
801 Is_Package : Boolean := True);
802 -- Restore the private views of external types, and unmark the generic
803 -- renamings of actuals, so that they become comptible subtypes again.
804 -- For subprograms, Pack_Id is the package constructed to hold the
807 procedure Switch_View (T : Entity_Id);
808 -- Switch the partial and full views of a type and its private
809 -- dependents (i.e. its subtypes and derived types).
811 ------------------------------------
812 -- Structures for Error Reporting --
813 ------------------------------------
815 Instantiation_Node : Node_Id;
816 -- Used by subprograms that validate instantiation of formal parameters
817 -- where there might be no actual on which to place the error message.
818 -- Also used to locate the instantiation node for generic subunits.
820 Instantiation_Error : exception;
821 -- When there is a semantic error in the generic parameter matching,
822 -- there is no point in continuing the instantiation, because the
823 -- number of cascaded errors is unpredictable. This exception aborts
824 -- the instantiation process altogether.
826 S_Adjustment : Sloc_Adjustment;
827 -- Offset created for each node in an instantiation, in order to keep
828 -- track of the source position of the instantiation in each of its nodes.
829 -- A subsequent semantic error or warning on a construct of the instance
830 -- points to both places: the original generic node, and the point of
831 -- instantiation. See Sinput and Sinput.L for additional details.
833 ------------------------------------------------------------
834 -- Data structure for keeping track when inside a Generic --
835 ------------------------------------------------------------
837 -- The following table is used to save values of the Inside_A_Generic
838 -- flag (see spec of Sem) when they are saved by Start_Generic.
840 package Generic_Flags is new Table.Table (
841 Table_Component_Type => Boolean,
842 Table_Index_Type => Int,
843 Table_Low_Bound => 0,
845 Table_Increment => 200,
846 Table_Name => "Generic_Flags");
848 ---------------------------
849 -- Abandon_Instantiation --
850 ---------------------------
852 procedure Abandon_Instantiation (N : Node_Id) is
854 Error_Msg_N ("\instantiation abandoned!", N);
855 raise Instantiation_Error;
856 end Abandon_Instantiation;
858 --------------------------
859 -- Analyze_Associations --
860 --------------------------
862 function Analyze_Associations
865 F_Copy : List_Id) return List_Id
867 Actual_Types : constant Elist_Id := New_Elmt_List;
868 Assoc : constant List_Id := New_List;
869 Default_Actuals : constant Elist_Id := New_Elmt_List;
870 Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy));
874 Next_Formal : Node_Id;
875 Temp_Formal : Node_Id;
876 Analyzed_Formal : Node_Id;
879 First_Named : Node_Id := Empty;
881 Default_Formals : constant List_Id := New_List;
882 -- If an Other_Choice is present, some of the formals may be defaulted.
883 -- To simplify the treatement of visibility in an instance, we introduce
884 -- individual defaults for each such formal. These defaults are
885 -- appended to the list of associations and replace the Others_Choice.
887 Found_Assoc : Node_Id;
888 -- Association for the current formal being match. Empty if there are
889 -- no remaining actuals, or if there is no named association with the
890 -- name of the formal.
892 Is_Named_Assoc : Boolean;
893 Num_Matched : Int := 0;
894 Num_Actuals : Int := 0;
896 Others_Present : Boolean := False;
897 -- In Ada 2005, indicates partial parametrization of of a formal
898 -- package. As usual an others association must be last in the list.
900 function Matching_Actual
902 A_F : Entity_Id) return Node_Id;
903 -- Find actual that corresponds to a given a formal parameter. If the
904 -- actuals are positional, return the next one, if any. If the actuals
905 -- are named, scan the parameter associations to find the right one.
906 -- A_F is the corresponding entity in the analyzed generic,which is
907 -- placed on the selector name for ASIS use.
909 -- In Ada 2005, a named association may be given with a box, in which
910 -- case Matching_Actual sets Found_Assoc to the generic association,
911 -- but return Empty for the actual itself. In this case the code below
912 -- creates a corresponding declaration for the formal.
914 function Partial_Parametrization return Boolean;
915 -- Ada 2005: if no match is found for a given formal, check if the
916 -- association for it includes a box, or whether the associations
917 -- include an Others clause.
919 procedure Process_Default (F : Entity_Id);
920 -- Add a copy of the declaration of generic formal F to the list of
921 -- associations, and add an explicit box association for F if there
922 -- is none yet, and the default comes from an Others_Choice.
924 procedure Set_Analyzed_Formal;
925 -- Find the node in the generic copy that corresponds to a given formal.
926 -- The semantic information on this node is used to perform legality
927 -- checks on the actuals. Because semantic analysis can introduce some
928 -- anonymous entities or modify the declaration node itself, the
929 -- correspondence between the two lists is not one-one. In addition to
930 -- anonymous types, the presence a formal equality will introduce an
931 -- implicit declaration for the corresponding inequality.
933 ---------------------
934 -- Matching_Actual --
935 ---------------------
937 function Matching_Actual
939 A_F : Entity_Id) return Node_Id
945 Is_Named_Assoc := False;
947 -- End of list of purely positional parameters
950 or else Nkind (Actual) = N_Others_Choice
952 Found_Assoc := Empty;
955 -- Case of positional parameter corresponding to current formal
957 elsif No (Selector_Name (Actual)) then
958 Found_Assoc := Actual;
959 Act := Explicit_Generic_Actual_Parameter (Actual);
960 Num_Matched := Num_Matched + 1;
963 -- Otherwise scan list of named actuals to find the one with the
964 -- desired name. All remaining actuals have explicit names.
967 Is_Named_Assoc := True;
968 Found_Assoc := Empty;
972 while Present (Actual) loop
973 if Chars (Selector_Name (Actual)) = Chars (F) then
974 Set_Entity (Selector_Name (Actual), A_F);
975 Set_Etype (Selector_Name (Actual), Etype (A_F));
976 Generate_Reference (A_F, Selector_Name (Actual));
977 Found_Assoc := Actual;
978 Act := Explicit_Generic_Actual_Parameter (Actual);
979 Num_Matched := Num_Matched + 1;
987 -- Reset for subsequent searches. In most cases the named
988 -- associations are in order. If they are not, we reorder them
989 -- to avoid scanning twice the same actual. This is not just a
990 -- question of efficiency: there may be multiple defaults with
991 -- boxes that have the same name. In a nested instantiation we
992 -- insert actuals for those defaults, and cannot rely on their
993 -- names to disambiguate them.
995 if Actual = First_Named then
998 elsif Present (Actual) then
999 Insert_Before (First_Named, Remove_Next (Prev));
1002 Actual := First_Named;
1005 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1006 Set_Used_As_Generic_Actual (Entity (Act));
1010 end Matching_Actual;
1012 -----------------------------
1013 -- Partial_Parametrization --
1014 -----------------------------
1016 function Partial_Parametrization return Boolean is
1018 return Others_Present
1019 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1020 end Partial_Parametrization;
1022 ---------------------
1023 -- Process_Default --
1024 ---------------------
1026 procedure Process_Default (F : Entity_Id) is
1027 Loc : constant Source_Ptr := Sloc (I_Node);
1033 -- Append copy of formal declaration to associations, and create
1034 -- new defining identifier for it.
1036 Decl := New_Copy_Tree (F);
1038 if Nkind (F) = N_Formal_Concrete_Subprogram_Declaration then
1040 Make_Defining_Identifier (Sloc (Defining_Entity (F)),
1041 Chars => Chars (Defining_Entity (F)));
1042 Set_Defining_Unit_Name (Specification (Decl), Id);
1046 Make_Defining_Identifier (Sloc (Defining_Entity (F)),
1047 Chars => Chars (Defining_Identifier (F)));
1048 Set_Defining_Identifier (Decl, Id);
1051 Append (Decl, Assoc);
1053 if No (Found_Assoc) then
1055 Make_Generic_Association (Loc,
1056 Selector_Name => New_Occurrence_Of (Id, Loc),
1057 Explicit_Generic_Actual_Parameter => Empty);
1058 Set_Box_Present (Default);
1059 Append (Default, Default_Formals);
1061 end Process_Default;
1063 -------------------------
1064 -- Set_Analyzed_Formal --
1065 -------------------------
1067 procedure Set_Analyzed_Formal is
1070 while Present (Analyzed_Formal) loop
1071 Kind := Nkind (Analyzed_Formal);
1073 case Nkind (Formal) is
1075 when N_Formal_Subprogram_Declaration =>
1076 exit when Kind in N_Formal_Subprogram_Declaration
1079 (Defining_Unit_Name (Specification (Formal))) =
1081 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1083 when N_Formal_Package_Declaration =>
1085 Kind = N_Formal_Package_Declaration
1087 Kind = N_Generic_Package_Declaration
1089 Kind = N_Package_Declaration;
1091 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1095 -- Skip freeze nodes, and nodes inserted to replace
1096 -- unrecognized pragmas.
1099 Kind not in N_Formal_Subprogram_Declaration
1100 and then Kind /= N_Subprogram_Declaration
1101 and then Kind /= N_Freeze_Entity
1102 and then Kind /= N_Null_Statement
1103 and then Kind /= N_Itype_Reference
1104 and then Chars (Defining_Identifier (Formal)) =
1105 Chars (Defining_Identifier (Analyzed_Formal));
1108 Next (Analyzed_Formal);
1110 end Set_Analyzed_Formal;
1112 -- Start of processing for Analyze_Associations
1115 Actuals := Generic_Associations (I_Node);
1117 if Present (Actuals) then
1119 -- check for an Others choice, indicating a partial parametrization
1120 -- for a formal package.
1122 Actual := First (Actuals);
1123 while Present (Actual) loop
1124 if Nkind (Actual) = N_Others_Choice then
1125 Others_Present := True;
1126 if Present (Next (Actual)) then
1127 Error_Msg_N ("others must be last association", Actual);
1130 -- This subprogram is used both for formal packages and for
1131 -- instantiations. For the latter, associations must all be
1134 if Nkind (I_Node) /= N_Formal_Package_Declaration
1135 and then Comes_From_Source (I_Node)
1138 ("others association not allowed in an instance",
1142 -- In any case, nothing to do after the others association
1146 elsif Box_Present (Actual)
1147 and then Comes_From_Source (I_Node)
1148 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1151 ("box association not allowed in an instance", Actual);
1157 -- If named associations are present, save first named association
1158 -- (it may of course be Empty) to facilitate subsequent name search.
1160 First_Named := First (Actuals);
1161 while Present (First_Named)
1162 and then Nkind (First_Named) /= N_Others_Choice
1163 and then No (Selector_Name (First_Named))
1165 Num_Actuals := Num_Actuals + 1;
1170 Named := First_Named;
1171 while Present (Named) loop
1172 if Nkind (Named) /= N_Others_Choice
1173 and then No (Selector_Name (Named))
1175 Error_Msg_N ("invalid positional actual after named one", Named);
1176 Abandon_Instantiation (Named);
1179 -- A named association may lack an actual parameter, if it was
1180 -- introduced for a default subprogram that turns out to be local
1181 -- to the outer instantiation.
1183 if Nkind (Named) /= N_Others_Choice
1184 and then Present (Explicit_Generic_Actual_Parameter (Named))
1186 Num_Actuals := Num_Actuals + 1;
1192 if Present (Formals) then
1193 Formal := First_Non_Pragma (Formals);
1194 Analyzed_Formal := First_Non_Pragma (F_Copy);
1196 if Present (Actuals) then
1197 Actual := First (Actuals);
1199 -- All formals should have default values
1205 while Present (Formal) loop
1206 Set_Analyzed_Formal;
1207 Next_Formal := Next_Non_Pragma (Formal);
1209 case Nkind (Formal) is
1210 when N_Formal_Object_Declaration =>
1213 Defining_Identifier (Formal),
1214 Defining_Identifier (Analyzed_Formal));
1216 if No (Match) and then Partial_Parametrization then
1217 Process_Default (Formal);
1220 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1224 when N_Formal_Type_Declaration =>
1227 Defining_Identifier (Formal),
1228 Defining_Identifier (Analyzed_Formal));
1231 if Partial_Parametrization then
1232 Process_Default (Formal);
1235 Error_Msg_Sloc := Sloc (Gen_Unit);
1239 Defining_Identifier (Formal));
1240 Error_Msg_NE ("\in instantiation of & declared#",
1241 Instantiation_Node, Gen_Unit);
1242 Abandon_Instantiation (Instantiation_Node);
1249 (Formal, Match, Analyzed_Formal, Assoc),
1252 -- An instantiation is a freeze point for the actuals,
1253 -- unless this is a rewritten formal package.
1255 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1256 Append_Elmt (Entity (Match), Actual_Types);
1260 -- A remote access-to-class-wide type must not be an
1261 -- actual parameter for a generic formal of an access
1262 -- type (E.2.2 (17)).
1264 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1266 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1267 N_Access_To_Object_Definition
1269 Validate_Remote_Access_To_Class_Wide_Type (Match);
1272 when N_Formal_Subprogram_Declaration =>
1275 Defining_Unit_Name (Specification (Formal)),
1276 Defining_Unit_Name (Specification (Analyzed_Formal)));
1278 -- If the formal subprogram has the same name as
1279 -- another formal subprogram of the generic, then
1280 -- a named association is illegal (12.3(9)). Exclude
1281 -- named associations that are generated for a nested
1285 and then Is_Named_Assoc
1286 and then Comes_From_Source (Found_Assoc)
1288 Temp_Formal := First (Formals);
1289 while Present (Temp_Formal) loop
1290 if Nkind (Temp_Formal) in
1291 N_Formal_Subprogram_Declaration
1292 and then Temp_Formal /= Formal
1294 Chars (Selector_Name (Found_Assoc)) =
1295 Chars (Defining_Unit_Name
1296 (Specification (Temp_Formal)))
1299 ("name not allowed for overloaded formal",
1301 Abandon_Instantiation (Instantiation_Node);
1308 -- If there is no corresponding actual, this may be case of
1309 -- partial parametrization, or else the formal has a default
1313 and then Partial_Parametrization
1315 Process_Default (Formal);
1318 Instantiate_Formal_Subprogram
1319 (Formal, Match, Analyzed_Formal));
1322 -- If this is a nested generic, preserve default for later
1326 and then Box_Present (Formal)
1329 (Defining_Unit_Name (Specification (Last (Assoc))),
1333 when N_Formal_Package_Declaration =>
1336 Defining_Identifier (Formal),
1337 Defining_Identifier (Original_Node (Analyzed_Formal)));
1340 if Partial_Parametrization then
1341 Process_Default (Formal);
1344 Error_Msg_Sloc := Sloc (Gen_Unit);
1347 Instantiation_Node, Defining_Identifier (Formal));
1348 Error_Msg_NE ("\in instantiation of & declared#",
1349 Instantiation_Node, Gen_Unit);
1351 Abandon_Instantiation (Instantiation_Node);
1357 (Instantiate_Formal_Package
1358 (Formal, Match, Analyzed_Formal),
1362 -- For use type and use package appearing in the generic part,
1363 -- we have already copied them, so we can just move them where
1364 -- they belong (we mustn't recopy them since this would mess up
1365 -- the Sloc values).
1367 when N_Use_Package_Clause |
1368 N_Use_Type_Clause =>
1369 if Nkind (Original_Node (I_Node)) =
1370 N_Formal_Package_Declaration
1372 Append (New_Copy_Tree (Formal), Assoc);
1375 Append (Formal, Assoc);
1379 raise Program_Error;
1383 Formal := Next_Formal;
1384 Next_Non_Pragma (Analyzed_Formal);
1387 if Num_Actuals > Num_Matched then
1388 Error_Msg_Sloc := Sloc (Gen_Unit);
1390 if Present (Selector_Name (Actual)) then
1392 ("unmatched actual&",
1393 Actual, Selector_Name (Actual));
1394 Error_Msg_NE ("\in instantiation of& declared#",
1398 ("unmatched actual in instantiation of& declared#",
1403 elsif Present (Actuals) then
1405 ("too many actuals in generic instantiation", Instantiation_Node);
1409 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1412 while Present (Elmt) loop
1413 Freeze_Before (I_Node, Node (Elmt));
1418 -- If there are default subprograms, normalize the tree by adding
1419 -- explicit associations for them. This is required if the instance
1420 -- appears within a generic.
1428 Elmt := First_Elmt (Default_Actuals);
1429 while Present (Elmt) loop
1430 if No (Actuals) then
1431 Actuals := New_List;
1432 Set_Generic_Associations (I_Node, Actuals);
1435 Subp := Node (Elmt);
1437 Make_Generic_Association (Sloc (Subp),
1438 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1439 Explicit_Generic_Actual_Parameter =>
1440 New_Occurrence_Of (Subp, Sloc (Subp)));
1441 Mark_Rewrite_Insertion (New_D);
1442 Append_To (Actuals, New_D);
1447 -- If this is a formal package. normalize the parameter list by adding
1448 -- explicit box asssociations for the formals that are covered by an
1451 if not Is_Empty_List (Default_Formals) then
1452 Append_List (Default_Formals, Formals);
1456 end Analyze_Associations;
1458 -------------------------------
1459 -- Analyze_Formal_Array_Type --
1460 -------------------------------
1462 procedure Analyze_Formal_Array_Type
1463 (T : in out Entity_Id;
1469 -- Treated like a non-generic array declaration, with additional
1474 if Nkind (Def) = N_Constrained_Array_Definition then
1475 DSS := First (Discrete_Subtype_Definitions (Def));
1476 while Present (DSS) loop
1477 if Nkind (DSS) = N_Subtype_Indication
1478 or else Nkind (DSS) = N_Range
1479 or else Nkind (DSS) = N_Attribute_Reference
1481 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1488 Array_Type_Declaration (T, Def);
1489 Set_Is_Generic_Type (Base_Type (T));
1491 if Ekind (Component_Type (T)) = E_Incomplete_Type
1492 and then No (Full_View (Component_Type (T)))
1494 Error_Msg_N ("premature usage of incomplete type", Def);
1496 -- Check that range constraint is not allowed on the component type
1497 -- of a generic formal array type (AARM 12.5.3(3))
1499 elsif Is_Internal (Component_Type (T))
1500 and then Present (Subtype_Indication (Component_Definition (Def)))
1501 and then Nkind (Original_Node
1502 (Subtype_Indication (Component_Definition (Def))))
1503 = N_Subtype_Indication
1506 ("in a formal, a subtype indication can only be "
1507 & "a subtype mark (RM 12.5.3(3))",
1508 Subtype_Indication (Component_Definition (Def)));
1511 end Analyze_Formal_Array_Type;
1513 ---------------------------------------------
1514 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1515 ---------------------------------------------
1517 -- As for other generic types, we create a valid type representation with
1518 -- legal but arbitrary attributes, whose values are never considered
1519 -- static. For all scalar types we introduce an anonymous base type, with
1520 -- the same attributes. We choose the corresponding integer type to be
1521 -- Standard_Integer.
1523 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1527 Loc : constant Source_Ptr := Sloc (Def);
1528 Base : constant Entity_Id :=
1530 (E_Decimal_Fixed_Point_Type,
1531 Current_Scope, Sloc (Def), 'G');
1532 Int_Base : constant Entity_Id := Standard_Integer;
1533 Delta_Val : constant Ureal := Ureal_1;
1534 Digs_Val : constant Uint := Uint_6;
1539 Set_Etype (Base, Base);
1540 Set_Size_Info (Base, Int_Base);
1541 Set_RM_Size (Base, RM_Size (Int_Base));
1542 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1543 Set_Digits_Value (Base, Digs_Val);
1544 Set_Delta_Value (Base, Delta_Val);
1545 Set_Small_Value (Base, Delta_Val);
1546 Set_Scalar_Range (Base,
1548 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1549 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1551 Set_Is_Generic_Type (Base);
1552 Set_Parent (Base, Parent (Def));
1554 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1555 Set_Etype (T, Base);
1556 Set_Size_Info (T, Int_Base);
1557 Set_RM_Size (T, RM_Size (Int_Base));
1558 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1559 Set_Digits_Value (T, Digs_Val);
1560 Set_Delta_Value (T, Delta_Val);
1561 Set_Small_Value (T, Delta_Val);
1562 Set_Scalar_Range (T, Scalar_Range (Base));
1563 Set_Is_Constrained (T);
1565 Check_Restriction (No_Fixed_Point, Def);
1566 end Analyze_Formal_Decimal_Fixed_Point_Type;
1568 -------------------------------------------
1569 -- Analyze_Formal_Derived_Interface_Type --
1570 -------------------------------------------
1572 procedure Analyze_Formal_Derived_Interface_Type
1577 Loc : constant Source_Ptr := Sloc (Def);
1581 -- Rewrite as a type declaration of a derived type. This ensures that
1582 -- the interface list and primitive operations are properly captured.
1585 Make_Full_Type_Declaration (Loc,
1586 Defining_Identifier => T,
1587 Type_Definition => Def);
1591 Set_Is_Generic_Type (T);
1592 end Analyze_Formal_Derived_Interface_Type;
1594 ---------------------------------
1595 -- Analyze_Formal_Derived_Type --
1596 ---------------------------------
1598 procedure Analyze_Formal_Derived_Type
1603 Loc : constant Source_Ptr := Sloc (Def);
1604 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1608 Set_Is_Generic_Type (T);
1610 if Private_Present (Def) then
1612 Make_Private_Extension_Declaration (Loc,
1613 Defining_Identifier => T,
1614 Discriminant_Specifications => Discriminant_Specifications (N),
1615 Unknown_Discriminants_Present => Unk_Disc,
1616 Subtype_Indication => Subtype_Mark (Def),
1617 Interface_List => Interface_List (Def));
1619 Set_Abstract_Present (New_N, Abstract_Present (Def));
1620 Set_Limited_Present (New_N, Limited_Present (Def));
1621 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
1625 Make_Full_Type_Declaration (Loc,
1626 Defining_Identifier => T,
1627 Discriminant_Specifications =>
1628 Discriminant_Specifications (Parent (T)),
1630 Make_Derived_Type_Definition (Loc,
1631 Subtype_Indication => Subtype_Mark (Def)));
1633 Set_Abstract_Present
1634 (Type_Definition (New_N), Abstract_Present (Def));
1636 (Type_Definition (New_N), Limited_Present (Def));
1643 if not Is_Composite_Type (T) then
1645 ("unknown discriminants not allowed for elementary types", N);
1647 Set_Has_Unknown_Discriminants (T);
1648 Set_Is_Constrained (T, False);
1652 -- If the parent type has a known size, so does the formal, which makes
1653 -- legal representation clauses that involve the formal.
1655 Set_Size_Known_At_Compile_Time
1656 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1658 end Analyze_Formal_Derived_Type;
1660 ----------------------------------
1661 -- Analyze_Formal_Discrete_Type --
1662 ----------------------------------
1664 -- The operations defined for a discrete types are those of an enumeration
1665 -- type. The size is set to an arbitrary value, for use in analyzing the
1668 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1669 Loc : constant Source_Ptr := Sloc (Def);
1673 Base : constant Entity_Id :=
1675 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1678 Set_Ekind (T, E_Enumeration_Subtype);
1679 Set_Etype (T, Base);
1682 Set_Is_Generic_Type (T);
1683 Set_Is_Constrained (T);
1685 -- For semantic analysis, the bounds of the type must be set to some
1686 -- non-static value. The simplest is to create attribute nodes for those
1687 -- bounds, that refer to the type itself. These bounds are never
1688 -- analyzed but serve as place-holders.
1691 Make_Attribute_Reference (Loc,
1692 Attribute_Name => Name_First,
1693 Prefix => New_Reference_To (T, Loc));
1697 Make_Attribute_Reference (Loc,
1698 Attribute_Name => Name_Last,
1699 Prefix => New_Reference_To (T, Loc));
1702 Set_Scalar_Range (T,
1707 Set_Ekind (Base, E_Enumeration_Type);
1708 Set_Etype (Base, Base);
1709 Init_Size (Base, 8);
1710 Init_Alignment (Base);
1711 Set_Is_Generic_Type (Base);
1712 Set_Scalar_Range (Base, Scalar_Range (T));
1713 Set_Parent (Base, Parent (Def));
1714 end Analyze_Formal_Discrete_Type;
1716 ----------------------------------
1717 -- Analyze_Formal_Floating_Type --
1718 ---------------------------------
1720 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1721 Base : constant Entity_Id :=
1723 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1726 -- The various semantic attributes are taken from the predefined type
1727 -- Float, just so that all of them are initialized. Their values are
1728 -- never used because no constant folding or expansion takes place in
1729 -- the generic itself.
1732 Set_Ekind (T, E_Floating_Point_Subtype);
1733 Set_Etype (T, Base);
1734 Set_Size_Info (T, (Standard_Float));
1735 Set_RM_Size (T, RM_Size (Standard_Float));
1736 Set_Digits_Value (T, Digits_Value (Standard_Float));
1737 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1738 Set_Is_Constrained (T);
1740 Set_Is_Generic_Type (Base);
1741 Set_Etype (Base, Base);
1742 Set_Size_Info (Base, (Standard_Float));
1743 Set_RM_Size (Base, RM_Size (Standard_Float));
1744 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1745 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1746 Set_Parent (Base, Parent (Def));
1748 Check_Restriction (No_Floating_Point, Def);
1749 end Analyze_Formal_Floating_Type;
1751 -----------------------------------
1752 -- Analyze_Formal_Interface_Type;--
1753 -----------------------------------
1755 procedure Analyze_Formal_Interface_Type
1760 Loc : constant Source_Ptr := Sloc (N);
1765 Make_Full_Type_Declaration (Loc,
1766 Defining_Identifier => T,
1767 Type_Definition => Def);
1771 Set_Is_Generic_Type (T);
1772 end Analyze_Formal_Interface_Type;
1774 ---------------------------------
1775 -- Analyze_Formal_Modular_Type --
1776 ---------------------------------
1778 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1780 -- Apart from their entity kind, generic modular types are treated like
1781 -- signed integer types, and have the same attributes.
1783 Analyze_Formal_Signed_Integer_Type (T, Def);
1784 Set_Ekind (T, E_Modular_Integer_Subtype);
1785 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1787 end Analyze_Formal_Modular_Type;
1789 ---------------------------------------
1790 -- Analyze_Formal_Object_Declaration --
1791 ---------------------------------------
1793 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1794 E : constant Node_Id := Default_Expression (N);
1795 Id : constant Node_Id := Defining_Identifier (N);
1802 -- Determine the mode of the formal object
1804 if Out_Present (N) then
1805 K := E_Generic_In_Out_Parameter;
1807 if not In_Present (N) then
1808 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1812 K := E_Generic_In_Parameter;
1815 if Present (Subtype_Mark (N)) then
1816 Find_Type (Subtype_Mark (N));
1817 T := Entity (Subtype_Mark (N));
1819 -- Ada 2005 (AI-423): Formal object with an access definition
1822 Check_Access_Definition (N);
1823 T := Access_Definition
1825 N => Access_Definition (N));
1828 if Ekind (T) = E_Incomplete_Type then
1830 Error_Node : Node_Id;
1833 if Present (Subtype_Mark (N)) then
1834 Error_Node := Subtype_Mark (N);
1836 Check_Access_Definition (N);
1837 Error_Node := Access_Definition (N);
1840 Error_Msg_N ("premature usage of incomplete type", Error_Node);
1844 if K = E_Generic_In_Parameter then
1846 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1848 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1850 ("generic formal of mode IN must not be of limited type", N);
1851 Explain_Limited_Type (T, N);
1854 if Is_Abstract_Type (T) then
1856 ("generic formal of mode IN must not be of abstract type", N);
1860 Analyze_Per_Use_Expression (E, T);
1862 if Is_Limited_Type (T) and then not OK_For_Limited_Init (E) then
1864 ("initialization not allowed for limited types", E);
1865 Explain_Limited_Type (T, E);
1872 -- Case of generic IN OUT parameter
1875 -- If the formal has an unconstrained type, construct its actual
1876 -- subtype, as is done for subprogram formals. In this fashion, all
1877 -- its uses can refer to specific bounds.
1882 if (Is_Array_Type (T)
1883 and then not Is_Constrained (T))
1885 (Ekind (T) = E_Record_Type
1886 and then Has_Discriminants (T))
1889 Non_Freezing_Ref : constant Node_Id :=
1890 New_Reference_To (Id, Sloc (Id));
1894 -- Make sure the actual subtype doesn't generate bogus freezing
1896 Set_Must_Not_Freeze (Non_Freezing_Ref);
1897 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1898 Insert_Before_And_Analyze (N, Decl);
1899 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1902 Set_Actual_Subtype (Id, T);
1907 ("initialization not allowed for `IN OUT` formals", N);
1911 end Analyze_Formal_Object_Declaration;
1913 ----------------------------------------------
1914 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1915 ----------------------------------------------
1917 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1921 Loc : constant Source_Ptr := Sloc (Def);
1922 Base : constant Entity_Id :=
1924 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1926 -- The semantic attributes are set for completeness only, their values
1927 -- will never be used, since all properties of the type are non-static.
1930 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1931 Set_Etype (T, Base);
1932 Set_Size_Info (T, Standard_Integer);
1933 Set_RM_Size (T, RM_Size (Standard_Integer));
1934 Set_Small_Value (T, Ureal_1);
1935 Set_Delta_Value (T, Ureal_1);
1936 Set_Scalar_Range (T,
1938 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1939 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1940 Set_Is_Constrained (T);
1942 Set_Is_Generic_Type (Base);
1943 Set_Etype (Base, Base);
1944 Set_Size_Info (Base, Standard_Integer);
1945 Set_RM_Size (Base, RM_Size (Standard_Integer));
1946 Set_Small_Value (Base, Ureal_1);
1947 Set_Delta_Value (Base, Ureal_1);
1948 Set_Scalar_Range (Base, Scalar_Range (T));
1949 Set_Parent (Base, Parent (Def));
1951 Check_Restriction (No_Fixed_Point, Def);
1952 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1954 ----------------------------
1955 -- Analyze_Formal_Package --
1956 ----------------------------
1958 procedure Analyze_Formal_Package (N : Node_Id) is
1959 Loc : constant Source_Ptr := Sloc (N);
1960 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1962 Gen_Id : constant Node_Id := Name (N);
1964 Gen_Unit : Entity_Id;
1966 Parent_Installed : Boolean := False;
1968 Parent_Instance : Entity_Id;
1969 Renaming_In_Par : Entity_Id;
1970 No_Associations : Boolean := False;
1972 function Build_Local_Package return Node_Id;
1973 -- The formal package is rewritten so that its parameters are replaced
1974 -- with corresponding declarations. For parameters with bona fide
1975 -- associations these declarations are created by Analyze_Associations
1976 -- as for aa regular instantiation. For boxed parameters, we preserve
1977 -- the formal declarations and analyze them, in order to introduce
1978 -- entities of the right kind in the environment of the formal.
1980 -------------------------
1981 -- Build_Local_Package --
1982 -------------------------
1984 function Build_Local_Package return Node_Id is
1986 Pack_Decl : Node_Id;
1989 -- Within the formal, the name of the generic package is a renaming
1990 -- of the formal (as for a regular instantiation).
1993 Make_Package_Declaration (Loc,
1996 (Specification (Original_Node (Gen_Decl)),
1997 Empty, Instantiating => True));
1999 Renaming := Make_Package_Renaming_Declaration (Loc,
2000 Defining_Unit_Name =>
2001 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2002 Name => New_Occurrence_Of (Formal, Loc));
2004 if Nkind (Gen_Id) = N_Identifier
2005 and then Chars (Gen_Id) = Chars (Pack_Id)
2008 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2011 -- If the formal is declared with a box, or with an others choice,
2012 -- create corresponding declarations for all entities in the formal
2013 -- part, so that names with the proper types are available in the
2014 -- specification of the formal package.
2015 -- On the other hand, if there are no associations, then all the
2016 -- formals must have defaults, and this will be checked by the
2017 -- call to Analyze_Associations.
2020 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2023 Formal_Decl : Node_Id;
2026 -- TBA : for a formal package, need to recurse ???
2031 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2032 while Present (Formal_Decl) loop
2034 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2039 -- If generic associations are present, use Analyze_Associations to
2040 -- create the proper renaming declarations.
2044 Act_Tree : constant Node_Id :=
2046 (Original_Node (Gen_Decl), Empty,
2047 Instantiating => True);
2050 Generic_Renamings.Set_Last (0);
2051 Generic_Renamings_HTable.Reset;
2052 Instantiation_Node := N;
2055 Analyze_Associations
2057 Generic_Formal_Declarations (Act_Tree),
2058 Generic_Formal_Declarations (Gen_Decl));
2062 Append (Renaming, To => Decls);
2064 -- Add generated declarations ahead of local declarations in
2067 if No (Visible_Declarations (Specification (Pack_Decl))) then
2068 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2071 (First (Visible_Declarations (Specification (Pack_Decl))),
2076 end Build_Local_Package;
2078 -- Start of processing for Analyze_Formal_Package
2081 Text_IO_Kludge (Gen_Id);
2084 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2085 Gen_Unit := Entity (Gen_Id);
2087 -- Check for a formal package that is a package renaming
2089 if Present (Renamed_Object (Gen_Unit)) then
2090 Gen_Unit := Renamed_Object (Gen_Unit);
2093 if Ekind (Gen_Unit) /= E_Generic_Package then
2094 Error_Msg_N ("expect generic package name", Gen_Id);
2098 elsif Gen_Unit = Current_Scope then
2100 ("generic package cannot be used as a formal package of itself",
2105 elsif In_Open_Scopes (Gen_Unit) then
2106 if Is_Compilation_Unit (Gen_Unit)
2107 and then Is_Child_Unit (Current_Scope)
2109 -- Special-case the error when the formal is a parent, and
2110 -- continue analysis to minimize cascaded errors.
2113 ("generic parent cannot be used as formal package "
2114 & "of a child unit",
2119 ("generic package cannot be used as a formal package "
2128 or else No (Generic_Associations (N))
2129 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2131 No_Associations := True;
2134 -- If there are no generic associations, the generic parameters appear
2135 -- as local entities and are instantiated like them. We copy the generic
2136 -- package declaration as if it were an instantiation, and analyze it
2137 -- like a regular package, except that we treat the formals as
2138 -- additional visible components.
2140 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2142 if In_Extended_Main_Source_Unit (N) then
2143 Set_Is_Instantiated (Gen_Unit);
2144 Generate_Reference (Gen_Unit, N);
2147 Formal := New_Copy (Pack_Id);
2148 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2150 -- Make local generic without formals. The formals will be replaced with
2151 -- internal declarations.
2153 New_N := Build_Local_Package;
2155 Set_Defining_Unit_Name (Specification (New_N), Formal);
2156 Set_Generic_Parent (Specification (N), Gen_Unit);
2157 Set_Instance_Env (Gen_Unit, Formal);
2158 Set_Is_Generic_Instance (Formal);
2160 Enter_Name (Formal);
2161 Set_Ekind (Formal, E_Package);
2162 Set_Etype (Formal, Standard_Void_Type);
2163 Set_Inner_Instances (Formal, New_Elmt_List);
2164 Push_Scope (Formal);
2166 if Is_Child_Unit (Gen_Unit)
2167 and then Parent_Installed
2169 -- Similarly, we have to make the name of the formal visible in the
2170 -- parent instance, to resolve properly fully qualified names that
2171 -- may appear in the generic unit. The parent instance has been
2172 -- placed on the scope stack ahead of the current scope.
2174 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2177 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2178 Set_Ekind (Renaming_In_Par, E_Package);
2179 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2180 Set_Scope (Renaming_In_Par, Parent_Instance);
2181 Set_Parent (Renaming_In_Par, Parent (Formal));
2182 Set_Renamed_Object (Renaming_In_Par, Formal);
2183 Append_Entity (Renaming_In_Par, Parent_Instance);
2186 Analyze (Specification (N));
2188 -- The formals for which associations are provided are not visible
2189 -- outside of the formal package. The others are still declared by a
2190 -- formal parameter declaration.
2192 if not No_Associations then
2197 E := First_Entity (Formal);
2198 while Present (E) loop
2199 exit when Ekind (E) = E_Package
2200 and then Renamed_Entity (E) = Formal;
2202 if not Is_Generic_Formal (E) then
2211 End_Package_Scope (Formal);
2213 if Parent_Installed then
2219 -- Inside the generic unit, the formal package is a regular package, but
2220 -- no body is needed for it. Note that after instantiation, the defining
2221 -- unit name we need is in the new tree and not in the original (see
2222 -- Package_Instantiation). A generic formal package is an instance, and
2223 -- can be used as an actual for an inner instance.
2225 Set_Has_Completion (Formal, True);
2227 -- Add semantic information to the original defining identifier.
2230 Set_Ekind (Pack_Id, E_Package);
2231 Set_Etype (Pack_Id, Standard_Void_Type);
2232 Set_Scope (Pack_Id, Scope (Formal));
2233 Set_Has_Completion (Pack_Id, True);
2235 -- If there are errors in the parameter list, Analyze_Associations
2236 -- raises Instantiation_Error. Patch the declaration to prevent
2237 -- further exception propagation.
2240 when Instantiation_Error =>
2242 Enter_Name (Formal);
2243 Set_Ekind (Formal, E_Variable);
2244 Set_Etype (Formal, Any_Type);
2246 if Parent_Installed then
2249 end Analyze_Formal_Package;
2251 ---------------------------------
2252 -- Analyze_Formal_Private_Type --
2253 ---------------------------------
2255 procedure Analyze_Formal_Private_Type
2261 New_Private_Type (N, T, Def);
2263 -- Set the size to an arbitrary but legal value
2265 Set_Size_Info (T, Standard_Integer);
2266 Set_RM_Size (T, RM_Size (Standard_Integer));
2267 end Analyze_Formal_Private_Type;
2269 ----------------------------------------
2270 -- Analyze_Formal_Signed_Integer_Type --
2271 ----------------------------------------
2273 procedure Analyze_Formal_Signed_Integer_Type
2277 Base : constant Entity_Id :=
2279 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
2284 Set_Ekind (T, E_Signed_Integer_Subtype);
2285 Set_Etype (T, Base);
2286 Set_Size_Info (T, Standard_Integer);
2287 Set_RM_Size (T, RM_Size (Standard_Integer));
2288 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2289 Set_Is_Constrained (T);
2291 Set_Is_Generic_Type (Base);
2292 Set_Size_Info (Base, Standard_Integer);
2293 Set_RM_Size (Base, RM_Size (Standard_Integer));
2294 Set_Etype (Base, Base);
2295 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2296 Set_Parent (Base, Parent (Def));
2297 end Analyze_Formal_Signed_Integer_Type;
2299 -------------------------------
2300 -- Analyze_Formal_Subprogram --
2301 -------------------------------
2303 procedure Analyze_Formal_Subprogram (N : Node_Id) is
2304 Spec : constant Node_Id := Specification (N);
2305 Def : constant Node_Id := Default_Name (N);
2306 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2314 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2315 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2319 Analyze_Subprogram_Declaration (N);
2320 Set_Is_Formal_Subprogram (Nam);
2321 Set_Has_Completion (Nam);
2323 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2324 Set_Is_Abstract_Subprogram (Nam);
2325 Set_Is_Dispatching_Operation (Nam);
2328 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2330 if No (Ctrl_Type) then
2332 ("abstract formal subprogram must have a controlling type",
2335 Check_Controlling_Formals (Ctrl_Type, Nam);
2340 -- Default name is resolved at the point of instantiation
2342 if Box_Present (N) then
2345 -- Else default is bound at the point of generic declaration
2347 elsif Present (Def) then
2348 if Nkind (Def) = N_Operator_Symbol then
2349 Find_Direct_Name (Def);
2351 elsif Nkind (Def) /= N_Attribute_Reference then
2355 -- For an attribute reference, analyze the prefix and verify
2356 -- that it has the proper profile for the subprogram.
2358 Analyze (Prefix (Def));
2359 Valid_Default_Attribute (Nam, Def);
2363 -- Default name may be overloaded, in which case the interpretation
2364 -- with the correct profile must be selected, as for a renaming.
2366 if Etype (Def) = Any_Type then
2369 elsif Nkind (Def) = N_Selected_Component then
2370 Subp := Entity (Selector_Name (Def));
2372 if Ekind (Subp) /= E_Entry then
2373 Error_Msg_N ("expect valid subprogram name as default", Def);
2377 elsif Nkind (Def) = N_Indexed_Component then
2379 if Nkind (Prefix (Def)) /= N_Selected_Component then
2380 Error_Msg_N ("expect valid subprogram name as default", Def);
2384 Subp := Entity (Selector_Name (Prefix (Def)));
2386 if Ekind (Subp) /= E_Entry_Family then
2387 Error_Msg_N ("expect valid subprogram name as default", Def);
2392 elsif Nkind (Def) = N_Character_Literal then
2394 -- Needs some type checks: subprogram should be parameterless???
2396 Resolve (Def, (Etype (Nam)));
2398 elsif not Is_Entity_Name (Def)
2399 or else not Is_Overloadable (Entity (Def))
2401 Error_Msg_N ("expect valid subprogram name as default", Def);
2404 elsif not Is_Overloaded (Def) then
2405 Subp := Entity (Def);
2408 Error_Msg_N ("premature usage of formal subprogram", Def);
2410 elsif not Entity_Matches_Spec (Subp, Nam) then
2411 Error_Msg_N ("no visible entity matches specification", Def);
2417 I1 : Interp_Index := 0;
2423 Get_First_Interp (Def, I, It);
2424 while Present (It.Nam) loop
2426 if Entity_Matches_Spec (It.Nam, Nam) then
2427 if Subp /= Any_Id then
2428 It1 := Disambiguate (Def, I1, I, Etype (Subp));
2430 if It1 = No_Interp then
2431 Error_Msg_N ("ambiguous default subprogram", Def);
2444 Get_Next_Interp (I, It);
2448 if Subp /= Any_Id then
2449 Set_Entity (Def, Subp);
2452 Error_Msg_N ("premature usage of formal subprogram", Def);
2454 elsif Ekind (Subp) /= E_Operator then
2455 Check_Mode_Conformant (Subp, Nam);
2459 Error_Msg_N ("no visible subprogram matches specification", N);
2463 end Analyze_Formal_Subprogram;
2465 -------------------------------------
2466 -- Analyze_Formal_Type_Declaration --
2467 -------------------------------------
2469 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
2470 Def : constant Node_Id := Formal_Type_Definition (N);
2474 T := Defining_Identifier (N);
2476 if Present (Discriminant_Specifications (N))
2477 and then Nkind (Def) /= N_Formal_Private_Type_Definition
2480 ("discriminants not allowed for this formal type",
2481 Defining_Identifier (First (Discriminant_Specifications (N))));
2484 -- Enter the new name, and branch to specific routine
2487 when N_Formal_Private_Type_Definition =>
2488 Analyze_Formal_Private_Type (N, T, Def);
2490 when N_Formal_Derived_Type_Definition =>
2491 Analyze_Formal_Derived_Type (N, T, Def);
2493 when N_Formal_Discrete_Type_Definition =>
2494 Analyze_Formal_Discrete_Type (T, Def);
2496 when N_Formal_Signed_Integer_Type_Definition =>
2497 Analyze_Formal_Signed_Integer_Type (T, Def);
2499 when N_Formal_Modular_Type_Definition =>
2500 Analyze_Formal_Modular_Type (T, Def);
2502 when N_Formal_Floating_Point_Definition =>
2503 Analyze_Formal_Floating_Type (T, Def);
2505 when N_Formal_Ordinary_Fixed_Point_Definition =>
2506 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2508 when N_Formal_Decimal_Fixed_Point_Definition =>
2509 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2511 when N_Array_Type_Definition =>
2512 Analyze_Formal_Array_Type (T, Def);
2514 when N_Access_To_Object_Definition |
2515 N_Access_Function_Definition |
2516 N_Access_Procedure_Definition =>
2517 Analyze_Generic_Access_Type (T, Def);
2519 -- Ada 2005: a interface declaration is encoded as an abstract
2520 -- record declaration or a abstract type derivation.
2522 when N_Record_Definition =>
2523 Analyze_Formal_Interface_Type (N, T, Def);
2525 when N_Derived_Type_Definition =>
2526 Analyze_Formal_Derived_Interface_Type (N, T, Def);
2532 raise Program_Error;
2536 Set_Is_Generic_Type (T);
2537 end Analyze_Formal_Type_Declaration;
2539 ------------------------------------
2540 -- Analyze_Function_Instantiation --
2541 ------------------------------------
2543 procedure Analyze_Function_Instantiation (N : Node_Id) is
2545 Analyze_Subprogram_Instantiation (N, E_Function);
2546 end Analyze_Function_Instantiation;
2548 ---------------------------------
2549 -- Analyze_Generic_Access_Type --
2550 ---------------------------------
2552 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2556 if Nkind (Def) = N_Access_To_Object_Definition then
2557 Access_Type_Declaration (T, Def);
2559 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2560 and then No (Full_View (Designated_Type (T)))
2561 and then not Is_Generic_Type (Designated_Type (T))
2563 Error_Msg_N ("premature usage of incomplete type", Def);
2565 elsif Is_Internal (Designated_Type (T)) then
2567 ("only a subtype mark is allowed in a formal", Def);
2571 Access_Subprogram_Declaration (T, Def);
2573 end Analyze_Generic_Access_Type;
2575 ---------------------------------
2576 -- Analyze_Generic_Formal_Part --
2577 ---------------------------------
2579 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2580 Gen_Parm_Decl : Node_Id;
2583 -- The generic formals are processed in the scope of the generic unit,
2584 -- where they are immediately visible. The scope is installed by the
2587 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2589 while Present (Gen_Parm_Decl) loop
2590 Analyze (Gen_Parm_Decl);
2591 Next (Gen_Parm_Decl);
2594 Generate_Reference_To_Generic_Formals (Current_Scope);
2595 end Analyze_Generic_Formal_Part;
2597 ------------------------------------------
2598 -- Analyze_Generic_Package_Declaration --
2599 ------------------------------------------
2601 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2602 Loc : constant Source_Ptr := Sloc (N);
2605 Save_Parent : Node_Id;
2607 Decls : constant List_Id :=
2608 Visible_Declarations (Specification (N));
2612 -- We introduce a renaming of the enclosing package, to have a usable
2613 -- entity as the prefix of an expanded name for a local entity of the
2614 -- form Par.P.Q, where P is the generic package. This is because a local
2615 -- entity named P may hide it, so that the usual visibility rules in
2616 -- the instance will not resolve properly.
2619 Make_Package_Renaming_Declaration (Loc,
2620 Defining_Unit_Name =>
2621 Make_Defining_Identifier (Loc,
2622 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2623 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2625 if Present (Decls) then
2626 Decl := First (Decls);
2627 while Present (Decl)
2628 and then Nkind (Decl) = N_Pragma
2633 if Present (Decl) then
2634 Insert_Before (Decl, Renaming);
2636 Append (Renaming, Visible_Declarations (Specification (N)));
2640 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2643 -- Create copy of generic unit, and save for instantiation. If the unit
2644 -- is a child unit, do not copy the specifications for the parent, which
2645 -- are not part of the generic tree.
2647 Save_Parent := Parent_Spec (N);
2648 Set_Parent_Spec (N, Empty);
2650 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2651 Set_Parent_Spec (New_N, Save_Parent);
2653 Id := Defining_Entity (N);
2654 Generate_Definition (Id);
2656 -- Expansion is not applied to generic units
2661 Set_Ekind (Id, E_Generic_Package);
2662 Set_Etype (Id, Standard_Void_Type);
2664 Enter_Generic_Scope (Id);
2665 Set_Inner_Instances (Id, New_Elmt_List);
2667 Set_Categorization_From_Pragmas (N);
2668 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2670 -- Link the declaration of the generic homonym in the generic copy to
2671 -- the package it renames, so that it is always resolved properly.
2673 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2674 Set_Entity (Associated_Node (Name (Renaming)), Id);
2676 -- For a library unit, we have reconstructed the entity for the unit,
2677 -- and must reset it in the library tables.
2679 if Nkind (Parent (N)) = N_Compilation_Unit then
2680 Set_Cunit_Entity (Current_Sem_Unit, Id);
2683 Analyze_Generic_Formal_Part (N);
2685 -- After processing the generic formals, analysis proceeds as for a
2686 -- non-generic package.
2688 Analyze (Specification (N));
2690 Validate_Categorization_Dependency (N, Id);
2694 End_Package_Scope (Id);
2695 Exit_Generic_Scope (Id);
2697 if Nkind (Parent (N)) /= N_Compilation_Unit then
2698 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2699 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2700 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2703 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2704 Validate_RT_RAT_Component (N);
2706 -- If this is a spec without a body, check that generic parameters
2709 if not Body_Required (Parent (N)) then
2710 Check_References (Id);
2713 end Analyze_Generic_Package_Declaration;
2715 --------------------------------------------
2716 -- Analyze_Generic_Subprogram_Declaration --
2717 --------------------------------------------
2719 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2724 Result_Type : Entity_Id;
2725 Save_Parent : Node_Id;
2728 -- Create copy of generic unit,and save for instantiation. If the unit
2729 -- is a child unit, do not copy the specifications for the parent, which
2730 -- are not part of the generic tree.
2732 Save_Parent := Parent_Spec (N);
2733 Set_Parent_Spec (N, Empty);
2735 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2736 Set_Parent_Spec (New_N, Save_Parent);
2739 Spec := Specification (N);
2740 Id := Defining_Entity (Spec);
2741 Generate_Definition (Id);
2743 if Nkind (Id) = N_Defining_Operator_Symbol then
2745 ("operator symbol not allowed for generic subprogram", Id);
2752 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2754 Enter_Generic_Scope (Id);
2755 Set_Inner_Instances (Id, New_Elmt_List);
2756 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2758 Analyze_Generic_Formal_Part (N);
2760 Formals := Parameter_Specifications (Spec);
2762 if Present (Formals) then
2763 Process_Formals (Formals, Spec);
2766 if Nkind (Spec) = N_Function_Specification then
2767 Set_Ekind (Id, E_Generic_Function);
2769 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
2770 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
2771 Set_Etype (Id, Result_Type);
2773 Find_Type (Result_Definition (Spec));
2774 Set_Etype (Id, Entity (Result_Definition (Spec)));
2778 Set_Ekind (Id, E_Generic_Procedure);
2779 Set_Etype (Id, Standard_Void_Type);
2782 -- For a library unit, we have reconstructed the entity for the unit,
2783 -- and must reset it in the library tables. We also make sure that
2784 -- Body_Required is set properly in the original compilation unit node.
2786 if Nkind (Parent (N)) = N_Compilation_Unit then
2787 Set_Cunit_Entity (Current_Sem_Unit, Id);
2788 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2791 Set_Categorization_From_Pragmas (N);
2792 Validate_Categorization_Dependency (N, Id);
2794 Save_Global_References (Original_Node (N));
2798 Exit_Generic_Scope (Id);
2799 Generate_Reference_To_Formals (Id);
2800 end Analyze_Generic_Subprogram_Declaration;
2802 -----------------------------------
2803 -- Analyze_Package_Instantiation --
2804 -----------------------------------
2806 procedure Analyze_Package_Instantiation (N : Node_Id) is
2807 Loc : constant Source_Ptr := Sloc (N);
2808 Gen_Id : constant Node_Id := Name (N);
2811 Act_Decl_Name : Node_Id;
2812 Act_Decl_Id : Entity_Id;
2817 Gen_Unit : Entity_Id;
2819 Is_Actual_Pack : constant Boolean :=
2820 Is_Internal (Defining_Entity (N));
2822 Env_Installed : Boolean := False;
2823 Parent_Installed : Boolean := False;
2824 Renaming_List : List_Id;
2825 Unit_Renaming : Node_Id;
2826 Needs_Body : Boolean;
2827 Inline_Now : Boolean := False;
2829 procedure Delay_Descriptors (E : Entity_Id);
2830 -- Delay generation of subprogram descriptors for given entity
2832 function Might_Inline_Subp return Boolean;
2833 -- If inlining is active and the generic contains inlined subprograms,
2834 -- we instantiate the body. This may cause superfluous instantiations,
2835 -- but it is simpler than detecting the need for the body at the point
2836 -- of inlining, when the context of the instance is not available.
2838 -----------------------
2839 -- Delay_Descriptors --
2840 -----------------------
2842 procedure Delay_Descriptors (E : Entity_Id) is
2844 if not Delay_Subprogram_Descriptors (E) then
2845 Set_Delay_Subprogram_Descriptors (E);
2846 Pending_Descriptor.Append (E);
2848 end Delay_Descriptors;
2850 -----------------------
2851 -- Might_Inline_Subp --
2852 -----------------------
2854 function Might_Inline_Subp return Boolean is
2858 if not Inline_Processing_Required then
2862 E := First_Entity (Gen_Unit);
2863 while Present (E) loop
2864 if Is_Subprogram (E)
2865 and then Is_Inlined (E)
2875 end Might_Inline_Subp;
2877 -- Start of processing for Analyze_Package_Instantiation
2880 -- Very first thing: apply the special kludge for Text_IO processing
2881 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2883 Text_IO_Kludge (Name (N));
2885 -- Make node global for error reporting
2887 Instantiation_Node := N;
2889 -- Case of instantiation of a generic package
2891 if Nkind (N) = N_Package_Instantiation then
2892 Act_Decl_Id := New_Copy (Defining_Entity (N));
2893 Set_Comes_From_Source (Act_Decl_Id, True);
2895 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2897 Make_Defining_Program_Unit_Name (Loc,
2898 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2899 Defining_Identifier => Act_Decl_Id);
2901 Act_Decl_Name := Act_Decl_Id;
2904 -- Case of instantiation of a formal package
2907 Act_Decl_Id := Defining_Identifier (N);
2908 Act_Decl_Name := Act_Decl_Id;
2911 Generate_Definition (Act_Decl_Id);
2912 Pre_Analyze_Actuals (N);
2915 Env_Installed := True;
2916 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2917 Gen_Unit := Entity (Gen_Id);
2919 -- Verify that it is the name of a generic package
2921 if Etype (Gen_Unit) = Any_Type then
2925 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2927 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2929 if From_With_Type (Gen_Unit) then
2931 ("cannot instantiate a limited withed package", Gen_Id);
2934 ("expect name of generic package in instantiation", Gen_Id);
2941 if In_Extended_Main_Source_Unit (N) then
2942 Set_Is_Instantiated (Gen_Unit);
2943 Generate_Reference (Gen_Unit, N);
2945 if Present (Renamed_Object (Gen_Unit)) then
2946 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2947 Generate_Reference (Renamed_Object (Gen_Unit), N);
2951 if Nkind (Gen_Id) = N_Identifier
2952 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2955 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2957 elsif Nkind (Gen_Id) = N_Expanded_Name
2958 and then Is_Child_Unit (Gen_Unit)
2959 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2960 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2963 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2966 Set_Entity (Gen_Id, Gen_Unit);
2968 -- If generic is a renaming, get original generic unit
2970 if Present (Renamed_Object (Gen_Unit))
2971 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2973 Gen_Unit := Renamed_Object (Gen_Unit);
2976 -- Verify that there are no circular instantiations
2978 if In_Open_Scopes (Gen_Unit) then
2979 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2983 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2984 Error_Msg_Node_2 := Current_Scope;
2986 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2987 Circularity_Detected := True;
2992 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2994 -- Initialize renamings map, for error checking, and the list that
2995 -- holds private entities whose views have changed between generic
2996 -- definition and instantiation. If this is the instance created to
2997 -- validate an actual package, the instantiation environment is that
2998 -- of the enclosing instance.
3000 Generic_Renamings.Set_Last (0);
3001 Generic_Renamings_HTable.Reset;
3003 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3005 -- Copy original generic tree, to produce text for instantiation
3009 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3011 Act_Spec := Specification (Act_Tree);
3013 -- If this is the instance created to validate an actual package,
3014 -- only the formals matter, do not examine the package spec itself.
3016 if Is_Actual_Pack then
3017 Set_Visible_Declarations (Act_Spec, New_List);
3018 Set_Private_Declarations (Act_Spec, New_List);
3022 Analyze_Associations
3024 Generic_Formal_Declarations (Act_Tree),
3025 Generic_Formal_Declarations (Gen_Decl));
3027 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3028 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3029 Set_Is_Generic_Instance (Act_Decl_Id);
3031 Set_Generic_Parent (Act_Spec, Gen_Unit);
3033 -- References to the generic in its own declaration or its body are
3034 -- references to the instance. Add a renaming declaration for the
3035 -- generic unit itself. This declaration, as well as the renaming
3036 -- declarations for the generic formals, must remain private to the
3037 -- unit: the formals, because this is the language semantics, and
3038 -- the unit because its use is an artifact of the implementation.
3041 Make_Package_Renaming_Declaration (Loc,
3042 Defining_Unit_Name =>
3043 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3044 Name => New_Reference_To (Act_Decl_Id, Loc));
3046 Append (Unit_Renaming, Renaming_List);
3048 -- The renaming declarations are the first local declarations of
3051 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3053 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3055 Set_Visible_Declarations (Act_Spec, Renaming_List);
3059 Make_Package_Declaration (Loc,
3060 Specification => Act_Spec);
3062 -- Save the instantiation node, for subsequent instantiation of the
3063 -- body, if there is one and we are generating code for the current
3064 -- unit. Mark the unit as having a body, to avoid a premature error
3067 -- We instantiate the body if we are generating code, if we are
3068 -- generating cross-reference information, or if we are building
3069 -- trees for ASIS use.
3072 Enclosing_Body_Present : Boolean := False;
3073 -- If the generic unit is not a compilation unit, then a body may
3074 -- be present in its parent even if none is required. We create a
3075 -- tentative pending instantiation for the body, which will be
3076 -- discarded if none is actually present.
3081 if Scope (Gen_Unit) /= Standard_Standard
3082 and then not Is_Child_Unit (Gen_Unit)
3084 Scop := Scope (Gen_Unit);
3086 while Present (Scop)
3087 and then Scop /= Standard_Standard
3089 if Unit_Requires_Body (Scop) then
3090 Enclosing_Body_Present := True;
3093 elsif In_Open_Scopes (Scop)
3094 and then In_Package_Body (Scop)
3096 Enclosing_Body_Present := True;
3100 exit when Is_Compilation_Unit (Scop);
3101 Scop := Scope (Scop);
3105 -- If front-end inlining is enabled, and this is a unit for which
3106 -- code will be generated, we instantiate the body at once.
3108 -- This is done if the instance is not the main unit, and if the
3109 -- generic is not a child unit of another generic, to avoid scope
3110 -- problems and the reinstallation of parent instances.
3113 and then (not Is_Child_Unit (Gen_Unit)
3114 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3115 and then Might_Inline_Subp
3116 and then not Is_Actual_Pack
3118 if Front_End_Inlining
3119 and then (Is_In_Main_Unit (N)
3120 or else In_Main_Context (Current_Scope))
3121 and then Nkind (Parent (N)) /= N_Compilation_Unit
3125 -- In configurable_run_time mode we force the inlining of
3126 -- predefined subprogram marked Inline_Always, to minimize
3127 -- the use of the run-time library.
3129 elsif Is_Predefined_File_Name
3130 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3131 and then Configurable_Run_Time_Mode
3132 and then Nkind (Parent (N)) /= N_Compilation_Unit
3137 -- If the current scope is itself an instance within a child
3138 -- unit, there will be duplications in the scope stack, and the
3139 -- unstacking mechanism in Inline_Instance_Body will fail.
3140 -- This loses some rare cases of optimization, and might be
3141 -- improved some day, if we can find a proper abstraction for
3142 -- "the complete compilation context" that can be saved and
3145 if Is_Generic_Instance (Current_Scope) then
3147 Curr_Unit : constant Entity_Id :=
3148 Cunit_Entity (Current_Sem_Unit);
3150 if Curr_Unit /= Current_Scope
3151 and then Is_Child_Unit (Curr_Unit)
3153 Inline_Now := False;
3160 (Unit_Requires_Body (Gen_Unit)
3161 or else Enclosing_Body_Present
3162 or else Present (Corresponding_Body (Gen_Decl)))
3163 and then (Is_In_Main_Unit (N)
3164 or else Might_Inline_Subp)
3165 and then not Is_Actual_Pack
3166 and then not Inline_Now
3167 and then (Operating_Mode = Generate_Code
3168 or else (Operating_Mode = Check_Semantics
3169 and then ASIS_Mode));
3171 -- If front_end_inlining is enabled, do not instantiate body if
3172 -- within a generic context.
3174 if (Front_End_Inlining
3175 and then not Expander_Active)
3176 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
3178 Needs_Body := False;
3181 -- If the current context is generic, and the package being
3182 -- instantiated is declared within a formal package, there is no
3183 -- body to instantiate until the enclosing generic is instantiated
3184 -- and there is an actual for the formal package. If the formal
3185 -- package has parameters, we build a regular package instance for
3186 -- it, that preceeds the original formal package declaration.
3188 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
3190 Decl : constant Node_Id :=
3192 (Unit_Declaration_Node (Scope (Gen_Unit)));
3194 if Nkind (Decl) = N_Formal_Package_Declaration
3195 or else (Nkind (Decl) = N_Package_Declaration
3196 and then Is_List_Member (Decl)
3197 and then Present (Next (Decl))
3199 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
3201 Needs_Body := False;
3207 -- If we are generating the calling stubs from the instantiation of
3208 -- a generic RCI package, we will not use the body of the generic
3211 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
3212 and then Is_Compilation_Unit (Defining_Entity (N))
3214 Needs_Body := False;
3219 -- Here is a defence against a ludicrous number of instantiations
3220 -- caused by a circular set of instantiation attempts.
3222 if Pending_Instantiations.Last >
3223 Hostparm.Max_Instantiations
3225 Error_Msg_N ("too many instantiations", N);
3226 raise Unrecoverable_Error;
3229 -- Indicate that the enclosing scopes contain an instantiation,
3230 -- and that cleanup actions should be delayed until after the
3231 -- instance body is expanded.
3233 Check_Forward_Instantiation (Gen_Decl);
3234 if Nkind (N) = N_Package_Instantiation then
3236 Enclosing_Master : Entity_Id;
3239 -- Loop to search enclosing masters
3241 Enclosing_Master := Current_Scope;
3242 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
3243 if Ekind (Enclosing_Master) = E_Package then
3244 if Is_Compilation_Unit (Enclosing_Master) then
3245 if In_Package_Body (Enclosing_Master) then
3247 (Body_Entity (Enclosing_Master));
3256 Enclosing_Master := Scope (Enclosing_Master);
3259 elsif Ekind (Enclosing_Master) = E_Generic_Package then
3260 Enclosing_Master := Scope (Enclosing_Master);
3262 elsif Is_Generic_Subprogram (Enclosing_Master)
3263 or else Ekind (Enclosing_Master) = E_Void
3265 -- Cleanup actions will eventually be performed on the
3266 -- enclosing instance, if any. Enclosing scope is void
3267 -- in the formal part of a generic subprogram.
3272 if Ekind (Enclosing_Master) = E_Entry
3274 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
3276 if not Expander_Active then
3280 Protected_Body_Subprogram (Enclosing_Master);
3284 Set_Delay_Cleanups (Enclosing_Master);
3286 while Ekind (Enclosing_Master) = E_Block loop
3287 Enclosing_Master := Scope (Enclosing_Master);
3290 if Is_Subprogram (Enclosing_Master) then
3291 Delay_Descriptors (Enclosing_Master);
3293 elsif Is_Task_Type (Enclosing_Master) then
3295 TBP : constant Node_Id :=
3296 Get_Task_Body_Procedure
3299 if Present (TBP) then
3300 Delay_Descriptors (TBP);
3301 Set_Delay_Cleanups (TBP);
3308 end loop Scope_Loop;
3311 -- Make entry in table
3313 Pending_Instantiations.Append
3315 Act_Decl => Act_Decl,
3316 Expander_Status => Expander_Active,
3317 Current_Sem_Unit => Current_Sem_Unit,
3318 Scope_Suppress => Scope_Suppress,
3319 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top));
3323 Set_Categorization_From_Pragmas (Act_Decl);
3325 if Parent_Installed then
3329 Set_Instance_Spec (N, Act_Decl);
3331 -- If not a compilation unit, insert the package declaration before
3332 -- the original instantiation node.
3334 if Nkind (Parent (N)) /= N_Compilation_Unit then
3335 Mark_Rewrite_Insertion (Act_Decl);
3336 Insert_Before (N, Act_Decl);
3339 -- For an instantiation that is a compilation unit, place declaration
3340 -- on current node so context is complete for analysis (including
3341 -- nested instantiations). If this is the main unit, the declaration
3342 -- eventually replaces the instantiation node. If the instance body
3343 -- is later created, it replaces the instance node, and the declation
3344 -- is attached to it (see Build_Instance_Compilation_Unit_Nodes).
3347 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
3349 -- The entity for the current unit is the newly created one,
3350 -- and all semantic information is attached to it.
3352 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
3354 -- If this is the main unit, replace the main entity as well
3356 if Current_Sem_Unit = Main_Unit then
3357 Main_Unit_Entity := Act_Decl_Id;
3361 Set_Unit (Parent (N), Act_Decl);
3362 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3363 Set_Package_Instantiation (Act_Decl_Id, N);
3365 Set_Unit (Parent (N), N);
3366 Set_Body_Required (Parent (N), False);
3368 -- We never need elaboration checks on instantiations, since by
3369 -- definition, the body instantiation is elaborated at the same
3370 -- time as the spec instantiation.
3372 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3373 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3376 Check_Elab_Instantiation (N);
3378 if ABE_Is_Certain (N) and then Needs_Body then
3379 Pending_Instantiations.Decrement_Last;
3382 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3384 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
3385 First_Private_Entity (Act_Decl_Id));
3387 -- If the instantiation will receive a body, the unit will be
3388 -- transformed into a package body, and receive its own elaboration
3389 -- entity. Otherwise, the nature of the unit is now a package
3392 if Nkind (Parent (N)) = N_Compilation_Unit
3393 and then not Needs_Body
3395 Rewrite (N, Act_Decl);
3398 if Present (Corresponding_Body (Gen_Decl))
3399 or else Unit_Requires_Body (Gen_Unit)
3401 Set_Has_Completion (Act_Decl_Id);
3404 Check_Formal_Packages (Act_Decl_Id);
3406 Restore_Private_Views (Act_Decl_Id);
3408 Inherit_Context (Gen_Decl, N);
3410 if Parent_Installed then
3415 Env_Installed := False;
3418 Validate_Categorization_Dependency (N, Act_Decl_Id);
3420 -- Check restriction, but skip this if something went wrong in the above
3421 -- analysis, indicated by Act_Decl_Id being void.
3423 if Ekind (Act_Decl_Id) /= E_Void
3424 and then not Is_Library_Level_Entity (Act_Decl_Id)
3426 Check_Restriction (No_Local_Allocators, N);
3430 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
3433 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3434 -- be used as defining identifiers for a formal package and for the
3435 -- corresponding expanded package.
3437 if Nkind (N) = N_Formal_Package_Declaration then
3438 Act_Decl_Id := New_Copy (Defining_Entity (N));
3439 Set_Comes_From_Source (Act_Decl_Id, True);
3440 Set_Is_Generic_Instance (Act_Decl_Id, False);
3441 Set_Defining_Identifier (N, Act_Decl_Id);
3445 when Instantiation_Error =>
3446 if Parent_Installed then
3450 if Env_Installed then
3453 end Analyze_Package_Instantiation;
3455 --------------------------
3456 -- Inline_Instance_Body --
3457 --------------------------
3459 procedure Inline_Instance_Body
3461 Gen_Unit : Entity_Id;
3465 Gen_Comp : constant Entity_Id :=
3466 Cunit_Entity (Get_Source_Unit (Gen_Unit));
3467 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
3468 Curr_Scope : Entity_Id := Empty;
3469 Curr_Unit : constant Entity_Id :=
3470 Cunit_Entity (Current_Sem_Unit);
3471 Removed : Boolean := False;
3472 Num_Scopes : Int := 0;
3474 Scope_Stack_Depth : constant Int :=
3475 Scope_Stack.Last - Scope_Stack.First + 1;
3477 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
3478 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
3479 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
3480 Num_Inner : Int := 0;
3481 N_Instances : Int := 0;
3485 -- Case of generic unit defined in another unit. We must remove the
3486 -- complete context of the current unit to install that of the generic.
3488 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
3490 -- Add some comments for the following two loops ???
3493 while Present (S) and then S /= Standard_Standard loop
3495 Num_Scopes := Num_Scopes + 1;
3497 Use_Clauses (Num_Scopes) :=
3499 (Scope_Stack.Last - Num_Scopes + 1).
3501 End_Use_Clauses (Use_Clauses (Num_Scopes));
3503 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
3504 or else Scope_Stack.Table
3505 (Scope_Stack.Last - Num_Scopes).Entity
3509 exit when Is_Generic_Instance (S)
3510 and then (In_Package_Body (S)
3511 or else Ekind (S) = E_Procedure
3512 or else Ekind (S) = E_Function);
3516 Vis := Is_Immediately_Visible (Gen_Comp);
3518 -- Find and save all enclosing instances
3523 and then S /= Standard_Standard
3525 if Is_Generic_Instance (S) then
3526 N_Instances := N_Instances + 1;
3527 Instances (N_Instances) := S;
3529 exit when In_Package_Body (S);
3535 -- Remove context of current compilation unit, unless we are within a
3536 -- nested package instantiation, in which case the context has been
3537 -- removed previously.
3539 -- If current scope is the body of a child unit, remove context of
3540 -- spec as well. If an enclosing scope is an instance body. the
3541 -- context has already been removed, but the entities in the body
3542 -- must be made invisible as well.
3547 and then S /= Standard_Standard
3549 if Is_Generic_Instance (S)
3550 and then (In_Package_Body (S)
3551 or else Ekind (S) = E_Procedure
3552 or else Ekind (S) = E_Function)
3554 -- We still have to remove the entities of the enclosing
3555 -- instance from direct visibility.
3560 E := First_Entity (S);
3561 while Present (E) loop
3562 Set_Is_Immediately_Visible (E, False);
3571 or else (Ekind (Curr_Unit) = E_Package_Body
3572 and then S = Spec_Entity (Curr_Unit))
3573 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3576 (Unit_Declaration_Node (Curr_Unit)))
3580 -- Remove entities in current scopes from visibility, so that
3581 -- instance body is compiled in a clean environment.
3583 Save_Scope_Stack (Handle_Use => False);
3585 if Is_Child_Unit (S) then
3587 -- Remove child unit from stack, as well as inner scopes.
3588 -- Removing the context of a child unit removes parent units
3591 while Current_Scope /= S loop
3592 Num_Inner := Num_Inner + 1;
3593 Inner_Scopes (Num_Inner) := Current_Scope;
3598 Remove_Context (Curr_Comp);
3602 Remove_Context (Curr_Comp);
3605 if Ekind (Curr_Unit) = E_Package_Body then
3606 Remove_Context (Library_Unit (Curr_Comp));
3612 pragma Assert (Num_Inner < Num_Scopes);
3614 Push_Scope (Standard_Standard);
3615 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3616 Instantiate_Package_Body
3619 Act_Decl => Act_Decl,
3620 Expander_Status => Expander_Active,
3621 Current_Sem_Unit => Current_Sem_Unit,
3622 Scope_Suppress => Scope_Suppress,
3623 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top)),
3624 Inlined_Body => True);
3630 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3632 -- Reset Generic_Instance flag so that use clauses can be installed
3633 -- in the proper order. (See Use_One_Package for effect of enclosing
3634 -- instances on processing of use clauses).
3636 for J in 1 .. N_Instances loop
3637 Set_Is_Generic_Instance (Instances (J), False);
3641 Install_Context (Curr_Comp);
3643 if Present (Curr_Scope)
3644 and then Is_Child_Unit (Curr_Scope)
3646 Push_Scope (Curr_Scope);
3647 Set_Is_Immediately_Visible (Curr_Scope);
3649 -- Finally, restore inner scopes as well
3651 for J in reverse 1 .. Num_Inner loop
3652 Push_Scope (Inner_Scopes (J));
3656 Restore_Scope_Stack (Handle_Use => False);
3658 if Present (Curr_Scope)
3660 (In_Private_Part (Curr_Scope)
3661 or else In_Package_Body (Curr_Scope))
3663 -- Install private declaration of ancestor units, which are
3664 -- currently available. Restore_Scope_Stack and Install_Context
3665 -- only install the visible part of parents.
3670 Par := Scope (Curr_Scope);
3671 while (Present (Par))
3672 and then Par /= Standard_Standard
3674 Install_Private_Declarations (Par);
3681 -- Restore use clauses. For a child unit, use clauses in the parents
3682 -- are restored when installing the context, so only those in inner
3683 -- scopes (and those local to the child unit itself) need to be
3684 -- installed explicitly.
3686 if Is_Child_Unit (Curr_Unit)
3689 for J in reverse 1 .. Num_Inner + 1 loop
3690 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3692 Install_Use_Clauses (Use_Clauses (J));
3696 for J in reverse 1 .. Num_Scopes loop
3697 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3699 Install_Use_Clauses (Use_Clauses (J));
3703 -- Restore status of instances. If one of them is a body, make
3704 -- its local entities visible again.
3711 for J in 1 .. N_Instances loop
3712 Inst := Instances (J);
3713 Set_Is_Generic_Instance (Inst, True);
3715 if In_Package_Body (Inst)
3716 or else Ekind (S) = E_Procedure
3717 or else Ekind (S) = E_Function
3719 E := First_Entity (Instances (J));
3720 while Present (E) loop
3721 Set_Is_Immediately_Visible (E);
3728 -- If generic unit is in current unit, current context is correct
3731 Instantiate_Package_Body
3734 Act_Decl => Act_Decl,
3735 Expander_Status => Expander_Active,
3736 Current_Sem_Unit => Current_Sem_Unit,
3737 Scope_Suppress => Scope_Suppress,
3738 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top)),
3739 Inlined_Body => True);
3741 end Inline_Instance_Body;
3743 -------------------------------------
3744 -- Analyze_Procedure_Instantiation --
3745 -------------------------------------
3747 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3749 Analyze_Subprogram_Instantiation (N, E_Procedure);
3750 end Analyze_Procedure_Instantiation;
3752 --------------------------------------
3753 -- Analyze_Subprogram_Instantiation --
3754 --------------------------------------
3756 procedure Analyze_Subprogram_Instantiation
3760 Loc : constant Source_Ptr := Sloc (N);
3761 Gen_Id : constant Node_Id := Name (N);
3763 Anon_Id : constant Entity_Id :=
3764 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3765 Chars => New_External_Name
3766 (Chars (Defining_Entity (N)), 'R'));
3768 Act_Decl_Id : Entity_Id;
3773 Env_Installed : Boolean := False;
3774 Gen_Unit : Entity_Id;
3776 Pack_Id : Entity_Id;
3777 Parent_Installed : Boolean := False;
3778 Renaming_List : List_Id;
3780 procedure Analyze_Instance_And_Renamings;
3781 -- The instance must be analyzed in a context that includes the mappings
3782 -- of generic parameters into actuals. We create a package declaration
3783 -- for this purpose, and a subprogram with an internal name within the
3784 -- package. The subprogram instance is simply an alias for the internal
3785 -- subprogram, declared in the current scope.
3787 ------------------------------------
3788 -- Analyze_Instance_And_Renamings --
3789 ------------------------------------
3791 procedure Analyze_Instance_And_Renamings is
3792 Def_Ent : constant Entity_Id := Defining_Entity (N);
3793 Pack_Decl : Node_Id;
3796 if Nkind (Parent (N)) = N_Compilation_Unit then
3798 -- For the case of a compilation unit, the container package has
3799 -- the same name as the instantiation, to insure that the binder
3800 -- calls the elaboration procedure with the right name. Copy the
3801 -- entity of the instance, which may have compilation level flags
3802 -- (e.g. Is_Child_Unit) set.
3804 Pack_Id := New_Copy (Def_Ent);
3807 -- Otherwise we use the name of the instantiation concatenated
3808 -- with its source position to ensure uniqueness if there are
3809 -- several instantiations with the same name.
3812 Make_Defining_Identifier (Loc,
3813 Chars => New_External_Name
3814 (Related_Id => Chars (Def_Ent),
3816 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3819 Pack_Decl := Make_Package_Declaration (Loc,
3820 Specification => Make_Package_Specification (Loc,
3821 Defining_Unit_Name => Pack_Id,
3822 Visible_Declarations => Renaming_List,
3823 End_Label => Empty));
3825 Set_Instance_Spec (N, Pack_Decl);
3826 Set_Is_Generic_Instance (Pack_Id);
3827 Set_Needs_Debug_Info (Pack_Id);
3829 -- Case of not a compilation unit
3831 if Nkind (Parent (N)) /= N_Compilation_Unit then
3832 Mark_Rewrite_Insertion (Pack_Decl);
3833 Insert_Before (N, Pack_Decl);
3834 Set_Has_Completion (Pack_Id);
3836 -- Case of an instantiation that is a compilation unit
3838 -- Place declaration on current node so context is complete for
3839 -- analysis (including nested instantiations), and for use in a
3840 -- context_clause (see Analyze_With_Clause).
3843 Set_Unit (Parent (N), Pack_Decl);
3844 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3847 Analyze (Pack_Decl);
3848 Check_Formal_Packages (Pack_Id);
3849 Set_Is_Generic_Instance (Pack_Id, False);
3851 -- Body of the enclosing package is supplied when instantiating the
3852 -- subprogram body, after semantic analysis is completed.
3854 if Nkind (Parent (N)) = N_Compilation_Unit then
3856 -- Remove package itself from visibility, so it does not
3857 -- conflict with subprogram.
3859 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3861 -- Set name and scope of internal subprogram so that the proper
3862 -- external name will be generated. The proper scope is the scope
3863 -- of the wrapper package. We need to generate debugging info for
3864 -- the internal subprogram, so set flag accordingly.
3866 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3867 Set_Scope (Anon_Id, Scope (Pack_Id));
3869 -- Mark wrapper package as referenced, to avoid spurious warnings
3870 -- if the instantiation appears in various with_ clauses of
3871 -- subunits of the main unit.
3873 Set_Referenced (Pack_Id);
3876 Set_Is_Generic_Instance (Anon_Id);
3877 Set_Needs_Debug_Info (Anon_Id);
3878 Act_Decl_Id := New_Copy (Anon_Id);
3880 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3881 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3882 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3883 Set_Comes_From_Source (Act_Decl_Id, True);
3885 -- The signature may involve types that are not frozen yet, but the
3886 -- subprogram will be frozen at the point the wrapper package is
3887 -- frozen, so it does not need its own freeze node. In fact, if one
3888 -- is created, it might conflict with the freezing actions from the
3889 -- wrapper package (see 7206-013).
3891 -- Should not really reference non-public TN's in comments ???
3893 Set_Has_Delayed_Freeze (Anon_Id, False);
3895 -- If the instance is a child unit, mark the Id accordingly. Mark
3896 -- the anonymous entity as well, which is the real subprogram and
3897 -- which is used when the instance appears in a context clause.
3899 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3900 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3901 New_Overloaded_Entity (Act_Decl_Id);
3902 Check_Eliminated (Act_Decl_Id);
3904 -- In compilation unit case, kill elaboration checks on the
3905 -- instantiation, since they are never needed -- the body is
3906 -- instantiated at the same point as the spec.
3908 if Nkind (Parent (N)) = N_Compilation_Unit then
3909 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3910 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3911 Set_Is_Compilation_Unit (Anon_Id);
3913 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3916 -- The instance is not a freezing point for the new subprogram
3918 Set_Is_Frozen (Act_Decl_Id, False);
3920 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3921 Valid_Operator_Definition (Act_Decl_Id);
3924 Set_Alias (Act_Decl_Id, Anon_Id);
3925 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3926 Set_Has_Completion (Act_Decl_Id);
3927 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3929 if Nkind (Parent (N)) = N_Compilation_Unit then
3930 Set_Body_Required (Parent (N), False);
3933 end Analyze_Instance_And_Renamings;
3935 -- Start of processing for Analyze_Subprogram_Instantiation
3938 -- Very first thing: apply the special kludge for Text_IO processing
3939 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3940 -- Of course such an instantiation is bogus (these are packages, not
3941 -- subprograms), but we get a better error message if we do this.
3943 Text_IO_Kludge (Gen_Id);
3945 -- Make node global for error reporting
3947 Instantiation_Node := N;
3948 Pre_Analyze_Actuals (N);
3951 Env_Installed := True;
3952 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3953 Gen_Unit := Entity (Gen_Id);
3955 Generate_Reference (Gen_Unit, Gen_Id);
3957 if Nkind (Gen_Id) = N_Identifier
3958 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3961 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3964 if Etype (Gen_Unit) = Any_Type then
3969 -- Verify that it is a generic subprogram of the right kind, and that
3970 -- it does not lead to a circular instantiation.
3972 if Ekind (Gen_Unit) /= E_Generic_Procedure
3973 and then Ekind (Gen_Unit) /= E_Generic_Function
3975 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3977 elsif In_Open_Scopes (Gen_Unit) then
3978 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3980 elsif K = E_Procedure
3981 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3983 if Ekind (Gen_Unit) = E_Generic_Function then
3985 ("cannot instantiate generic function as procedure", Gen_Id);
3988 ("expect name of generic procedure in instantiation", Gen_Id);
3991 elsif K = E_Function
3992 and then Ekind (Gen_Unit) /= E_Generic_Function
3994 if Ekind (Gen_Unit) = E_Generic_Procedure then
3996 ("cannot instantiate generic procedure as function", Gen_Id);
3999 ("expect name of generic function in instantiation", Gen_Id);
4003 Set_Entity (Gen_Id, Gen_Unit);
4004 Set_Is_Instantiated (Gen_Unit);
4006 if In_Extended_Main_Source_Unit (N) then
4007 Generate_Reference (Gen_Unit, N);
4010 -- If renaming, get original unit
4012 if Present (Renamed_Object (Gen_Unit))
4013 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
4015 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
4017 Gen_Unit := Renamed_Object (Gen_Unit);
4018 Set_Is_Instantiated (Gen_Unit);
4019 Generate_Reference (Gen_Unit, N);
4022 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
4023 Error_Msg_Node_2 := Current_Scope;
4025 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
4026 Circularity_Detected := True;
4030 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
4032 -- Initialize renamings map, for error checking
4034 Generic_Renamings.Set_Last (0);
4035 Generic_Renamings_HTable.Reset;
4037 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
4039 -- Copy original generic tree, to produce text for instantiation
4043 (Original_Node (Gen_Decl), Empty, Instantiating => True);
4045 Act_Spec := Specification (Act_Tree);
4047 Analyze_Associations
4049 Generic_Formal_Declarations (Act_Tree),
4050 Generic_Formal_Declarations (Gen_Decl));
4052 -- The subprogram itself cannot contain a nested instance, so the
4053 -- current parent is left empty.
4055 Set_Instance_Env (Gen_Unit, Empty);
4057 -- Build the subprogram declaration, which does not appear in the
4058 -- generic template, and give it a sloc consistent with that of the
4061 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
4062 Set_Generic_Parent (Act_Spec, Gen_Unit);
4064 Make_Subprogram_Declaration (Sloc (Act_Spec),
4065 Specification => Act_Spec);
4067 Set_Categorization_From_Pragmas (Act_Decl);
4069 if Parent_Installed then
4073 Append (Act_Decl, Renaming_List);
4074 Analyze_Instance_And_Renamings;
4076 -- If the generic is marked Import (Intrinsic), then so is the
4077 -- instance. This indicates that there is no body to instantiate. If
4078 -- generic is marked inline, so it the instance, and the anonymous
4079 -- subprogram it renames. If inlined, or else if inlining is enabled
4080 -- for the compilation, we generate the instance body even if it is
4081 -- not within the main unit.
4083 -- Any other pragmas might also be inherited ???
4085 if Is_Intrinsic_Subprogram (Gen_Unit) then
4086 Set_Is_Intrinsic_Subprogram (Anon_Id);
4087 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
4089 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
4090 Validate_Unchecked_Conversion (N, Act_Decl_Id);
4094 Generate_Definition (Act_Decl_Id);
4096 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
4097 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
4099 if not Is_Intrinsic_Subprogram (Gen_Unit) then
4100 Check_Elab_Instantiation (N);
4103 if Is_Dispatching_Operation (Act_Decl_Id)
4104 and then Ada_Version >= Ada_05
4110 Formal := First_Formal (Act_Decl_Id);
4111 while Present (Formal) loop
4112 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
4113 and then Is_Controlling_Formal (Formal)
4114 and then not Can_Never_Be_Null (Formal)
4116 Error_Msg_NE ("access parameter& is controlling,",
4118 Error_Msg_NE ("\corresponding parameter of & must be"
4119 & " explicitly null-excluding", N, Gen_Id);
4122 Next_Formal (Formal);
4127 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4129 -- Subject to change, pending on if other pragmas are inherited ???
4131 Validate_Categorization_Dependency (N, Act_Decl_Id);
4133 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
4134 Inherit_Context (Gen_Decl, N);
4136 Restore_Private_Views (Pack_Id, False);
4138 -- If the context requires a full instantiation, mark node for
4139 -- subsequent construction of the body.
4141 if (Is_In_Main_Unit (N)
4142 or else Is_Inlined (Act_Decl_Id))
4143 and then (Operating_Mode = Generate_Code
4144 or else (Operating_Mode = Check_Semantics
4145 and then ASIS_Mode))
4146 and then (Expander_Active or else ASIS_Mode)
4147 and then not ABE_Is_Certain (N)
4148 and then not Is_Eliminated (Act_Decl_Id)
4150 Pending_Instantiations.Append
4152 Act_Decl => Act_Decl,
4153 Expander_Status => Expander_Active,
4154 Current_Sem_Unit => Current_Sem_Unit,
4155 Scope_Suppress => Scope_Suppress,
4156 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top));
4158 Check_Forward_Instantiation (Gen_Decl);
4160 -- The wrapper package is always delayed, because it does not
4161 -- constitute a freeze point, but to insure that the freeze
4162 -- node is placed properly, it is created directly when
4163 -- instantiating the body (otherwise the freeze node might
4164 -- appear to early for nested instantiations).
4166 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4168 -- For ASIS purposes, indicate that the wrapper package has
4169 -- replaced the instantiation node.
4171 Rewrite (N, Unit (Parent (N)));
4172 Set_Unit (Parent (N), N);
4175 elsif Nkind (Parent (N)) = N_Compilation_Unit then
4177 -- Replace instance node for library-level instantiations of
4178 -- intrinsic subprograms, for ASIS use.
4180 Rewrite (N, Unit (Parent (N)));
4181 Set_Unit (Parent (N), N);
4184 if Parent_Installed then
4189 Env_Installed := False;
4190 Generic_Renamings.Set_Last (0);
4191 Generic_Renamings_HTable.Reset;
4195 when Instantiation_Error =>
4196 if Parent_Installed then
4200 if Env_Installed then
4203 end Analyze_Subprogram_Instantiation;
4205 -------------------------
4206 -- Get_Associated_Node --
4207 -------------------------
4209 function Get_Associated_Node (N : Node_Id) return Node_Id is
4210 Assoc : Node_Id := Associated_Node (N);
4213 if Nkind (Assoc) /= Nkind (N) then
4216 elsif Nkind (Assoc) = N_Aggregate
4217 or else Nkind (Assoc) = N_Extension_Aggregate
4222 -- If the node is part of an inner generic, it may itself have been
4223 -- remapped into a further generic copy. Associated_Node is otherwise
4224 -- used for the entity of the node, and will be of a different node
4225 -- kind, or else N has been rewritten as a literal or function call.
4227 while Present (Associated_Node (Assoc))
4228 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
4230 Assoc := Associated_Node (Assoc);
4233 -- Follow and additional link in case the final node was rewritten.
4234 -- This can only happen with nested generic units.
4236 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
4237 and then Present (Associated_Node (Assoc))
4238 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
4240 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
4242 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
4244 Nkind (Associated_Node (Assoc)) = N_Real_Literal
4246 Nkind (Associated_Node (Assoc)) = N_String_Literal)
4248 Assoc := Associated_Node (Assoc);
4253 end Get_Associated_Node;
4255 -------------------------------------------
4256 -- Build_Instance_Compilation_Unit_Nodes --
4257 -------------------------------------------
4259 procedure Build_Instance_Compilation_Unit_Nodes
4264 Decl_Cunit : Node_Id;
4265 Body_Cunit : Node_Id;
4267 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
4268 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
4271 -- A new compilation unit node is built for the instance declaration
4274 Make_Compilation_Unit (Sloc (N),
4275 Context_Items => Empty_List,
4278 Make_Compilation_Unit_Aux (Sloc (N)));
4280 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4281 Set_Body_Required (Decl_Cunit, True);
4283 -- We use the original instantiation compilation unit as the resulting
4284 -- compilation unit of the instance, since this is the main unit.
4286 Rewrite (N, Act_Body);
4287 Body_Cunit := Parent (N);
4289 -- The two compilation unit nodes are linked by the Library_Unit field
4291 Set_Library_Unit (Decl_Cunit, Body_Cunit);
4292 Set_Library_Unit (Body_Cunit, Decl_Cunit);
4294 -- Preserve the private nature of the package if needed
4296 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
4298 -- If the instance is not the main unit, its context, categorization,
4299 -- and elaboration entity are not relevant to the compilation.
4301 if Parent (N) /= Cunit (Main_Unit) then
4305 -- The context clause items on the instantiation, which are now attached
4306 -- to the body compilation unit (since the body overwrote the original
4307 -- instantiation node), semantically belong on the spec, so copy them
4308 -- there. It's harmless to leave them on the body as well. In fact one
4309 -- could argue that they belong in both places.
4311 Citem := First (Context_Items (Body_Cunit));
4312 while Present (Citem) loop
4313 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
4317 -- Propagate categorization flags on packages, so that they appear in
4318 -- the ali file for the spec of the unit.
4320 if Ekind (New_Main) = E_Package then
4321 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
4322 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
4323 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
4324 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
4325 Set_Is_Remote_Call_Interface
4326 (Old_Main, Is_Remote_Call_Interface (New_Main));
4329 -- Make entry in Units table, so that binder can generate call to
4330 -- elaboration procedure for body, if any.
4332 Make_Instance_Unit (Body_Cunit);
4333 Main_Unit_Entity := New_Main;
4334 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
4336 -- Build elaboration entity, since the instance may certainly generate
4337 -- elaboration code requiring a flag for protection.
4339 Build_Elaboration_Entity (Decl_Cunit, New_Main);
4340 end Build_Instance_Compilation_Unit_Nodes;
4342 -----------------------------
4343 -- Check_Access_Definition --
4344 -----------------------------
4346 procedure Check_Access_Definition (N : Node_Id) is
4349 (Ada_Version >= Ada_05
4350 and then Present (Access_Definition (N)));
4352 end Check_Access_Definition;
4354 -----------------------------------
4355 -- Check_Formal_Package_Instance --
4356 -----------------------------------
4358 -- If the formal has specific parameters, they must match those of the
4359 -- actual. Both of them are instances, and the renaming declarations for
4360 -- their formal parameters appear in the same order in both. The analyzed
4361 -- formal has been analyzed in the context of the current instance.
4363 procedure Check_Formal_Package_Instance
4364 (Formal_Pack : Entity_Id;
4365 Actual_Pack : Entity_Id)
4367 E1 : Entity_Id := First_Entity (Actual_Pack);
4368 E2 : Entity_Id := First_Entity (Formal_Pack);
4373 procedure Check_Mismatch (B : Boolean);
4374 -- Common error routine for mismatch between the parameters of the
4375 -- actual instance and those of the formal package.
4377 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
4378 -- The formal may come from a nested formal package, and the actual may
4379 -- have been constant-folded. To determine whether the two denote the
4380 -- same entity we may have to traverse several definitions to recover
4381 -- the ultimate entity that they refer to.
4383 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
4384 -- Similarly, if the formal comes from a nested formal package, the
4385 -- actual may designate the formal through multiple renamings, which
4386 -- have to be followed to determine the original variable in question.
4388 --------------------
4389 -- Check_Mismatch --
4390 --------------------
4392 procedure Check_Mismatch (B : Boolean) is
4393 Kind : constant Node_Kind := Nkind (Parent (E2));
4396 if Kind = N_Formal_Type_Declaration then
4399 elsif Kind = N_Formal_Object_Declaration
4400 or else Kind in N_Formal_Subprogram_Declaration
4401 or else Kind = N_Formal_Package_Declaration
4407 ("actual for & in actual instance does not match formal",
4408 Parent (Actual_Pack), E1);
4412 --------------------------------
4413 -- Same_Instantiated_Constant --
4414 --------------------------------
4416 function Same_Instantiated_Constant
4417 (E1, E2 : Entity_Id) return Boolean
4423 while Present (Ent) loop
4427 elsif Ekind (Ent) /= E_Constant then
4430 elsif Is_Entity_Name (Constant_Value (Ent)) then
4431 if Entity (Constant_Value (Ent)) = E1 then
4434 Ent := Entity (Constant_Value (Ent));
4437 -- The actual may be a constant that has been folded. Recover
4440 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
4441 Ent := Entity (Original_Node (Constant_Value (Ent)));
4448 end Same_Instantiated_Constant;
4450 --------------------------------
4451 -- Same_Instantiated_Variable --
4452 --------------------------------
4454 function Same_Instantiated_Variable
4455 (E1, E2 : Entity_Id) return Boolean
4457 function Original_Entity (E : Entity_Id) return Entity_Id;
4458 -- Follow chain of renamings to the ultimate ancestor
4460 ---------------------
4461 -- Original_Entity --
4462 ---------------------
4464 function Original_Entity (E : Entity_Id) return Entity_Id is
4469 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
4470 and then Present (Renamed_Object (Orig))
4471 and then Is_Entity_Name (Renamed_Object (Orig))
4473 Orig := Entity (Renamed_Object (Orig));
4477 end Original_Entity;
4479 -- Start of processing for Same_Instantiated_Variable
4482 return Ekind (E1) = Ekind (E2)
4483 and then Original_Entity (E1) = Original_Entity (E2);
4484 end Same_Instantiated_Variable;
4486 -- Start of processing for Check_Formal_Package_Instance
4490 and then Present (E2)
4492 exit when Ekind (E1) = E_Package
4493 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
4495 -- If the formal is the renaming of the formal package, this
4496 -- is the end of its formal part, which may occur before the
4497 -- end of the formal part in the actual in the presence of
4498 -- defaulted parameters in the formal package.
4500 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
4501 and then Renamed_Entity (E2) = Scope (E2);
4503 -- The analysis of the actual may generate additional internal
4504 -- entities. If the formal is defaulted, there is no corresponding
4505 -- analysis and the internal entities must be skipped, until we
4506 -- find corresponding entities again.
4508 if Comes_From_Source (E2)
4509 and then not Comes_From_Source (E1)
4510 and then Chars (E1) /= Chars (E2)
4513 and then Chars (E1) /= Chars (E2)
4522 -- If the formal entity comes from a formal declaration. it was
4523 -- defaulted in the formal package, and no check is needed on it.
4525 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then
4528 elsif Is_Type (E1) then
4530 -- Subtypes must statically match. E1, E2 are the local entities
4531 -- that are subtypes of the actuals. Itypes generated for other
4532 -- parameters need not be checked, the check will be performed
4533 -- on the parameters themselves.
4535 -- If E2 is a formal type declaration, it is a defaulted parameter
4536 -- and needs no checking.
4538 if not Is_Itype (E1)
4539 and then not Is_Itype (E2)
4543 or else Etype (E1) /= Etype (E2)
4544 or else not Subtypes_Statically_Match (E1, E2));
4547 elsif Ekind (E1) = E_Constant then
4549 -- IN parameters must denote the same static value, or the same
4550 -- constant, or the literal null.
4552 Expr1 := Expression (Parent (E1));
4554 if Ekind (E2) /= E_Constant then
4555 Check_Mismatch (True);
4558 Expr2 := Expression (Parent (E2));
4561 if Is_Static_Expression (Expr1) then
4563 if not Is_Static_Expression (Expr2) then
4564 Check_Mismatch (True);
4566 elsif Is_Discrete_Type (Etype (E1)) then
4568 V1 : constant Uint := Expr_Value (Expr1);
4569 V2 : constant Uint := Expr_Value (Expr2);
4571 Check_Mismatch (V1 /= V2);
4574 elsif Is_Real_Type (Etype (E1)) then
4576 V1 : constant Ureal := Expr_Value_R (Expr1);
4577 V2 : constant Ureal := Expr_Value_R (Expr2);
4579 Check_Mismatch (V1 /= V2);
4582 elsif Is_String_Type (Etype (E1))
4583 and then Nkind (Expr1) = N_String_Literal
4585 if Nkind (Expr2) /= N_String_Literal then
4586 Check_Mismatch (True);
4589 (not String_Equal (Strval (Expr1), Strval (Expr2)));
4593 elsif Is_Entity_Name (Expr1) then
4594 if Is_Entity_Name (Expr2) then
4595 if Entity (Expr1) = Entity (Expr2) then
4599 (not Same_Instantiated_Constant
4600 (Entity (Expr1), Entity (Expr2)));
4603 Check_Mismatch (True);
4606 elsif Is_Entity_Name (Original_Node (Expr1))
4607 and then Is_Entity_Name (Expr2)
4609 Same_Instantiated_Constant
4610 (Entity (Original_Node (Expr1)), Entity (Expr2))
4614 elsif Nkind (Expr1) = N_Null then
4615 Check_Mismatch (Nkind (Expr1) /= N_Null);
4618 Check_Mismatch (True);
4621 elsif Ekind (E1) = E_Variable then
4622 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
4624 elsif Ekind (E1) = E_Package then
4626 (Ekind (E1) /= Ekind (E2)
4627 or else Renamed_Object (E1) /= Renamed_Object (E2));
4629 elsif Is_Overloadable (E1) then
4631 -- Verify that the names of the entities match. Note that actuals
4632 -- that are attributes are rewritten as subprograms.
4635 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
4638 raise Program_Error;
4645 end Check_Formal_Package_Instance;
4647 ---------------------------
4648 -- Check_Formal_Packages --
4649 ---------------------------
4651 procedure Check_Formal_Packages (P_Id : Entity_Id) is
4653 Formal_P : Entity_Id;
4656 -- Iterate through the declarations in the instance, looking for package
4657 -- renaming declarations that denote instances of formal packages. Stop
4658 -- when we find the renaming of the current package itself. The
4659 -- declaration for a formal package without a box is followed by an
4660 -- internal entity that repeats the instantiation.
4662 E := First_Entity (P_Id);
4663 while Present (E) loop
4664 if Ekind (E) = E_Package then
4665 if Renamed_Object (E) = P_Id then
4668 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4671 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
4672 Formal_P := Next_Entity (E);
4673 Check_Formal_Package_Instance (Formal_P, E);
4675 -- After checking, remove the internal validating package. It
4676 -- is only needed for semantic checks, and as it may contain
4677 -- generic formal declarations it should not reach gigi.
4679 Remove (Unit_Declaration_Node (Formal_P));
4685 end Check_Formal_Packages;
4687 ---------------------------------
4688 -- Check_Forward_Instantiation --
4689 ---------------------------------
4691 procedure Check_Forward_Instantiation (Decl : Node_Id) is
4693 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
4696 -- The instantiation appears before the generic body if we are in the
4697 -- scope of the unit containing the generic, either in its spec or in
4698 -- the package body. and before the generic body.
4700 if Ekind (Gen_Comp) = E_Package_Body then
4701 Gen_Comp := Spec_Entity (Gen_Comp);
4704 if In_Open_Scopes (Gen_Comp)
4705 and then No (Corresponding_Body (Decl))
4710 and then not Is_Compilation_Unit (S)
4711 and then not Is_Child_Unit (S)
4713 if Ekind (S) = E_Package then
4714 Set_Has_Forward_Instantiation (S);
4720 end Check_Forward_Instantiation;
4722 ---------------------------
4723 -- Check_Generic_Actuals --
4724 ---------------------------
4726 -- The visibility of the actuals may be different between the point of
4727 -- generic instantiation and the instantiation of the body.
4729 procedure Check_Generic_Actuals
4730 (Instance : Entity_Id;
4731 Is_Formal_Box : Boolean)
4736 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
4737 -- For a formal that is an array type, the component type is often a
4738 -- previous formal in the same unit. The privacy status of the component
4739 -- type will have been examined earlier in the traversal of the
4740 -- corresponding actuals, and this status should not be modified for the
4741 -- array type itself.
4743 -- To detect this case we have to rescan the list of formals, which
4744 -- is usually short enough to ignore the resulting inefficiency.
4746 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
4749 Prev := First_Entity (Instance);
4750 while Present (Prev) loop
4752 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
4753 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
4754 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
4764 end Denotes_Previous_Actual;
4766 -- Start of processing for Check_Generic_Actuals
4769 E := First_Entity (Instance);
4770 while Present (E) loop
4772 and then Nkind (Parent (E)) = N_Subtype_Declaration
4773 and then Scope (Etype (E)) /= Instance
4774 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
4776 if Is_Array_Type (E)
4777 and then Denotes_Previous_Actual (Component_Type (E))
4781 Check_Private_View (Subtype_Indication (Parent (E)));
4783 Set_Is_Generic_Actual_Type (E, True);
4784 Set_Is_Hidden (E, False);
4785 Set_Is_Potentially_Use_Visible (E,
4788 -- We constructed the generic actual type as a subtype of the
4789 -- supplied type. This means that it normally would not inherit
4790 -- subtype specific attributes of the actual, which is wrong for
4791 -- the generic case.
4793 Astype := Ancestor_Subtype (E);
4797 -- This can happen when E is an itype that is the full view of
4798 -- a private type completed, e.g. with a constrained array. In
4799 -- that case, use the first subtype, which will carry size
4800 -- information. The base type itself is unconstrained and will
4803 Astype := First_Subtype (E);
4806 Set_Size_Info (E, (Astype));
4807 Set_RM_Size (E, RM_Size (Astype));
4808 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4810 if Is_Discrete_Or_Fixed_Point_Type (E) then
4811 Set_RM_Size (E, RM_Size (Astype));
4813 -- In nested instances, the base type of an access actual
4814 -- may itself be private, and need to be exchanged.
4816 elsif Is_Access_Type (E)
4817 and then Is_Private_Type (Etype (E))
4820 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4823 elsif Ekind (E) = E_Package then
4825 -- If this is the renaming for the current instance, we're done.
4826 -- Otherwise it is a formal package. If the corresponding formal
4827 -- was declared with a box, the (instantiations of the) generic
4828 -- formal part are also visible. Otherwise, ignore the entity
4829 -- created to validate the actuals.
4831 if Renamed_Object (E) = Instance then
4834 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4837 -- The visibility of a formal of an enclosing generic is already
4840 elsif Denotes_Formal_Package (E) then
4843 elsif Present (Associated_Formal_Package (E))
4844 and then not Is_Generic_Formal (E)
4846 if Box_Present (Parent (Associated_Formal_Package (E))) then
4847 Check_Generic_Actuals (Renamed_Object (E), True);
4850 Check_Generic_Actuals (Renamed_Object (E), False);
4853 Set_Is_Hidden (E, False);
4856 -- If this is a subprogram instance (in a wrapper package) the
4857 -- actual is fully visible.
4859 elsif Is_Wrapper_Package (Instance) then
4860 Set_Is_Hidden (E, False);
4862 -- If the formal package is declared with a box, or if the formal
4863 -- parameter is defaulted, it is visible in the body.
4866 or else Is_Visible_Formal (E)
4868 Set_Is_Hidden (E, False);
4873 end Check_Generic_Actuals;
4875 ------------------------------
4876 -- Check_Generic_Child_Unit --
4877 ------------------------------
4879 procedure Check_Generic_Child_Unit
4881 Parent_Installed : in out Boolean)
4883 Loc : constant Source_Ptr := Sloc (Gen_Id);
4884 Gen_Par : Entity_Id := Empty;
4885 Inst_Par : Entity_Id;
4889 function Find_Generic_Child
4891 Id : Node_Id) return Entity_Id;
4892 -- Search generic parent for possible child unit with the given name
4894 function In_Enclosing_Instance return Boolean;
4895 -- Within an instance of the parent, the child unit may be denoted
4896 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4897 -- scopes to locate a possible parent instantiation.
4899 ------------------------
4900 -- Find_Generic_Child --
4901 ------------------------
4903 function Find_Generic_Child
4905 Id : Node_Id) return Entity_Id
4910 -- If entity of name is already set, instance has already been
4911 -- resolved, e.g. in an enclosing instantiation.
4913 if Present (Entity (Id)) then
4914 if Scope (Entity (Id)) = Scop then
4921 E := First_Entity (Scop);
4922 while Present (E) loop
4923 if Chars (E) = Chars (Id)
4924 and then Is_Child_Unit (E)
4926 if Is_Child_Unit (E)
4927 and then not Is_Visible_Child_Unit (E)
4930 ("generic child unit& is not visible", Gen_Id, E);
4942 end Find_Generic_Child;
4944 ---------------------------
4945 -- In_Enclosing_Instance --
4946 ---------------------------
4948 function In_Enclosing_Instance return Boolean is
4949 Enclosing_Instance : Node_Id;
4950 Instance_Decl : Node_Id;
4953 -- We do not inline any call that contains instantiations, except
4954 -- for instantiations of Unchecked_Conversion, so if we are within
4955 -- an inlined body the current instance does not require parents.
4957 if In_Inlined_Body then
4958 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
4962 -- Loop to check enclosing scopes
4964 Enclosing_Instance := Current_Scope;
4965 while Present (Enclosing_Instance) loop
4966 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4968 if Ekind (Enclosing_Instance) = E_Package
4969 and then Is_Generic_Instance (Enclosing_Instance)
4971 (Generic_Parent (Specification (Instance_Decl)))
4973 -- Check whether the generic we are looking for is a child of
4976 E := Find_Generic_Child
4977 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4978 exit when Present (E);
4984 Enclosing_Instance := Scope (Enclosing_Instance);
4996 Make_Expanded_Name (Loc,
4998 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4999 Selector_Name => New_Occurrence_Of (E, Loc)));
5001 Set_Entity (Gen_Id, E);
5002 Set_Etype (Gen_Id, Etype (E));
5003 Parent_Installed := False; -- Already in scope.
5006 end In_Enclosing_Instance;
5008 -- Start of processing for Check_Generic_Child_Unit
5011 -- If the name of the generic is given by a selected component, it may
5012 -- be the name of a generic child unit, and the prefix is the name of an
5013 -- instance of the parent, in which case the child unit must be visible.
5014 -- If this instance is not in scope, it must be placed there and removed
5015 -- after instantiation, because what is being instantiated is not the
5016 -- original child, but the corresponding child present in the instance
5019 -- If the child is instantiated within the parent, it can be given by
5020 -- a simple name. In this case the instance is already in scope, but
5021 -- the child generic must be recovered from the generic parent as well.
5023 if Nkind (Gen_Id) = N_Selected_Component then
5024 S := Selector_Name (Gen_Id);
5025 Analyze (Prefix (Gen_Id));
5026 Inst_Par := Entity (Prefix (Gen_Id));
5028 if Ekind (Inst_Par) = E_Package
5029 and then Present (Renamed_Object (Inst_Par))
5031 Inst_Par := Renamed_Object (Inst_Par);
5034 if Ekind (Inst_Par) = E_Package then
5035 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
5036 Gen_Par := Generic_Parent (Parent (Inst_Par));
5038 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
5040 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
5042 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
5045 elsif Ekind (Inst_Par) = E_Generic_Package
5046 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
5048 -- A formal package may be a real child package, and not the
5049 -- implicit instance within a parent. In this case the child is
5050 -- not visible and has to be retrieved explicitly as well.
5052 Gen_Par := Inst_Par;
5055 if Present (Gen_Par) then
5057 -- The prefix denotes an instantiation. The entity itself may be a
5058 -- nested generic, or a child unit.
5060 E := Find_Generic_Child (Gen_Par, S);
5063 Change_Selected_Component_To_Expanded_Name (Gen_Id);
5064 Set_Entity (Gen_Id, E);
5065 Set_Etype (Gen_Id, Etype (E));
5067 Set_Etype (S, Etype (E));
5069 -- Indicate that this is a reference to the parent
5071 if In_Extended_Main_Source_Unit (Gen_Id) then
5072 Set_Is_Instantiated (Inst_Par);
5075 -- A common mistake is to replicate the naming scheme of a
5076 -- hierarchy by instantiating a generic child directly, rather
5077 -- than the implicit child in a parent instance:
5079 -- generic .. package Gpar is ..
5080 -- generic .. package Gpar.Child is ..
5081 -- package Par is new Gpar ();
5084 -- package Par.Child is new Gpar.Child ();
5085 -- rather than Par.Child
5087 -- In this case the instantiation is within Par, which is an
5088 -- instance, but Gpar does not denote Par because we are not IN
5089 -- the instance of Gpar, so this is illegal. The test below
5090 -- recognizes this particular case.
5092 if Is_Child_Unit (E)
5093 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
5094 and then (not In_Instance
5095 or else Nkind (Parent (Parent (Gen_Id))) =
5099 ("prefix of generic child unit must be instance of parent",
5103 if not In_Open_Scopes (Inst_Par)
5104 and then Nkind (Parent (Gen_Id)) not in
5105 N_Generic_Renaming_Declaration
5107 Install_Parent (Inst_Par);
5108 Parent_Installed := True;
5110 elsif In_Open_Scopes (Inst_Par) then
5112 -- If the parent is already installed verify that the
5113 -- actuals for its formal packages declared with a box
5114 -- are already installed. This is necessary when the
5115 -- child instance is a child of the parent instance.
5116 -- In this case the parent is placed on the scope stack
5117 -- but the formal packages are not made visible.
5119 Install_Formal_Packages (Inst_Par);
5123 -- If the generic parent does not contain an entity that
5124 -- corresponds to the selector, the instance doesn't either.
5125 -- Analyzing the node will yield the appropriate error message.
5126 -- If the entity is not a child unit, then it is an inner
5127 -- generic in the parent.
5135 if Is_Child_Unit (Entity (Gen_Id))
5137 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5138 and then not In_Open_Scopes (Inst_Par)
5140 Install_Parent (Inst_Par);
5141 Parent_Installed := True;
5145 elsif Nkind (Gen_Id) = N_Expanded_Name then
5147 -- Entity already present, analyze prefix, whose meaning may be
5148 -- an instance in the current context. If it is an instance of
5149 -- a relative within another, the proper parent may still have
5150 -- to be installed, if they are not of the same generation.
5152 Analyze (Prefix (Gen_Id));
5153 Inst_Par := Entity (Prefix (Gen_Id));
5155 if In_Enclosing_Instance then
5158 elsif Present (Entity (Gen_Id))
5159 and then Is_Child_Unit (Entity (Gen_Id))
5160 and then not In_Open_Scopes (Inst_Par)
5162 Install_Parent (Inst_Par);
5163 Parent_Installed := True;
5166 elsif In_Enclosing_Instance then
5168 -- The child unit is found in some enclosing scope
5175 -- If this is the renaming of the implicit child in a parent
5176 -- instance, recover the parent name and install it.
5178 if Is_Entity_Name (Gen_Id) then
5179 E := Entity (Gen_Id);
5181 if Is_Generic_Unit (E)
5182 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
5183 and then Is_Child_Unit (Renamed_Object (E))
5184 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
5185 and then Nkind (Name (Parent (E))) = N_Expanded_Name
5188 New_Copy_Tree (Name (Parent (E))));
5189 Inst_Par := Entity (Prefix (Gen_Id));
5191 if not In_Open_Scopes (Inst_Par) then
5192 Install_Parent (Inst_Par);
5193 Parent_Installed := True;
5196 -- If it is a child unit of a non-generic parent, it may be
5197 -- use-visible and given by a direct name. Install parent as
5200 elsif Is_Generic_Unit (E)
5201 and then Is_Child_Unit (E)
5203 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
5204 and then not Is_Generic_Unit (Scope (E))
5206 if not In_Open_Scopes (Scope (E)) then
5207 Install_Parent (Scope (E));
5208 Parent_Installed := True;
5213 end Check_Generic_Child_Unit;
5215 -----------------------------
5216 -- Check_Hidden_Child_Unit --
5217 -----------------------------
5219 procedure Check_Hidden_Child_Unit
5221 Gen_Unit : Entity_Id;
5222 Act_Decl_Id : Entity_Id)
5224 Gen_Id : constant Node_Id := Name (N);
5227 if Is_Child_Unit (Gen_Unit)
5228 and then Is_Child_Unit (Act_Decl_Id)
5229 and then Nkind (Gen_Id) = N_Expanded_Name
5230 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
5231 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
5233 Error_Msg_Node_2 := Scope (Act_Decl_Id);
5235 ("generic unit & is implicitly declared in &",
5236 Defining_Unit_Name (N), Gen_Unit);
5237 Error_Msg_N ("\instance must have different name",
5238 Defining_Unit_Name (N));
5240 end Check_Hidden_Child_Unit;
5242 ------------------------
5243 -- Check_Private_View --
5244 ------------------------
5246 procedure Check_Private_View (N : Node_Id) is
5247 T : constant Entity_Id := Etype (N);
5251 -- Exchange views if the type was not private in the generic but is
5252 -- private at the point of instantiation. Do not exchange views if
5253 -- the scope of the type is in scope. This can happen if both generic
5254 -- and instance are sibling units, or if type is defined in a parent.
5255 -- In this case the visibility of the type will be correct for all
5259 BT := Base_Type (T);
5261 if Is_Private_Type (T)
5262 and then not Has_Private_View (N)
5263 and then Present (Full_View (T))
5264 and then not In_Open_Scopes (Scope (T))
5266 -- In the generic, the full type was visible. Save the private
5267 -- entity, for subsequent exchange.
5271 elsif Has_Private_View (N)
5272 and then not Is_Private_Type (T)
5273 and then not Has_Been_Exchanged (T)
5274 and then Etype (Get_Associated_Node (N)) /= T
5276 -- Only the private declaration was visible in the generic. If
5277 -- the type appears in a subtype declaration, the subtype in the
5278 -- instance must have a view compatible with that of its parent,
5279 -- which must be exchanged (see corresponding code in Restore_
5280 -- Private_Views). Otherwise, if the type is defined in a parent
5281 -- unit, leave full visibility within instance, which is safe.
5283 if In_Open_Scopes (Scope (Base_Type (T)))
5284 and then not Is_Private_Type (Base_Type (T))
5285 and then Comes_From_Source (Base_Type (T))
5289 elsif Nkind (Parent (N)) = N_Subtype_Declaration
5290 or else not In_Private_Part (Scope (Base_Type (T)))
5292 Prepend_Elmt (T, Exchanged_Views);
5293 Exchange_Declarations (Etype (Get_Associated_Node (N)));
5296 -- For composite types with inconsistent representation exchange
5297 -- component types accordingly.
5299 elsif Is_Access_Type (T)
5300 and then Is_Private_Type (Designated_Type (T))
5301 and then not Has_Private_View (N)
5302 and then Present (Full_View (Designated_Type (T)))
5304 Switch_View (Designated_Type (T));
5306 elsif Is_Array_Type (T) then
5307 if Is_Private_Type (Component_Type (T))
5308 and then not Has_Private_View (N)
5309 and then Present (Full_View (Component_Type (T)))
5311 Switch_View (Component_Type (T));
5314 -- The normal exchange mechanism relies on the setting of a
5315 -- flag on the reference in the generic. However, an additional
5316 -- mechanism is needed for types that are not explicitly mentioned
5317 -- in the generic, but may be needed in expanded code in the
5318 -- instance. This includes component types of arrays and
5319 -- designated types of access types. This processing must also
5320 -- include the index types of arrays which we take care of here.
5327 Indx := First_Index (T);
5328 Typ := Base_Type (Etype (Indx));
5329 while Present (Indx) loop
5330 if Is_Private_Type (Typ)
5331 and then Present (Full_View (Typ))
5340 elsif Is_Private_Type (T)
5341 and then Present (Full_View (T))
5342 and then Is_Array_Type (Full_View (T))
5343 and then Is_Private_Type (Component_Type (Full_View (T)))
5347 -- Finally, a non-private subtype may have a private base type, which
5348 -- must be exchanged for consistency. This can happen when a package
5349 -- body is instantiated, when the scope stack is empty but in fact
5350 -- the subtype and the base type are declared in an enclosing scope.
5352 -- Note that in this case we introduce an inconsistency in the view
5353 -- set, because we switch the base type BT, but there could be some
5354 -- private dependent subtypes of BT which remain unswitched. Such
5355 -- subtypes might need to be switched at a later point (see specific
5356 -- provision for that case in Switch_View).
5358 elsif not Is_Private_Type (T)
5359 and then not Has_Private_View (N)
5360 and then Is_Private_Type (BT)
5361 and then Present (Full_View (BT))
5362 and then not Is_Generic_Type (BT)
5363 and then not In_Open_Scopes (BT)
5365 Prepend_Elmt (Full_View (BT), Exchanged_Views);
5366 Exchange_Declarations (BT);
5369 end Check_Private_View;
5371 --------------------------
5372 -- Contains_Instance_Of --
5373 --------------------------
5375 function Contains_Instance_Of
5378 N : Node_Id) return Boolean
5386 -- Verify that there are no circular instantiations. We check whether
5387 -- the unit contains an instance of the current scope or some enclosing
5388 -- scope (in case one of the instances appears in a subunit). Longer
5389 -- circularities involving subunits might seem too pathological to
5390 -- consider, but they were not too pathological for the authors of
5391 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5392 -- enclosing generic scopes as containing an instance.
5395 -- Within a generic subprogram body, the scope is not generic, to
5396 -- allow for recursive subprograms. Use the declaration to determine
5397 -- whether this is a generic unit.
5399 if Ekind (Scop) = E_Generic_Package
5400 or else (Is_Subprogram (Scop)
5401 and then Nkind (Unit_Declaration_Node (Scop)) =
5402 N_Generic_Subprogram_Declaration)
5404 Elmt := First_Elmt (Inner_Instances (Inner));
5406 while Present (Elmt) loop
5407 if Node (Elmt) = Scop then
5408 Error_Msg_Node_2 := Inner;
5410 ("circular Instantiation: & instantiated within &!",
5414 elsif Node (Elmt) = Inner then
5417 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
5418 Error_Msg_Node_2 := Inner;
5420 ("circular Instantiation: & instantiated within &!",
5428 -- Indicate that Inner is being instantiated within Scop
5430 Append_Elmt (Inner, Inner_Instances (Scop));
5433 if Scop = Standard_Standard then
5436 Scop := Scope (Scop);
5441 end Contains_Instance_Of;
5443 -----------------------
5444 -- Copy_Generic_Node --
5445 -----------------------
5447 function Copy_Generic_Node
5449 Parent_Id : Node_Id;
5450 Instantiating : Boolean) return Node_Id
5455 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
5456 -- Check the given value of one of the Fields referenced by the
5457 -- current node to determine whether to copy it recursively. The
5458 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5459 -- value (Sloc, Uint, Char) in which case it need not be copied.
5461 procedure Copy_Descendants;
5462 -- Common utility for various nodes
5464 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
5465 -- Make copy of element list
5467 function Copy_Generic_List
5469 Parent_Id : Node_Id) return List_Id;
5470 -- Apply Copy_Node recursively to the members of a node list
5472 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
5473 -- True if an identifier is part of the defining program unit name
5474 -- of a child unit. The entity of such an identifier must be kept
5475 -- (for ASIS use) even though as the name of an enclosing generic
5476 -- it would otherwise not be preserved in the generic tree.
5478 ----------------------
5479 -- Copy_Descendants --
5480 ----------------------
5482 procedure Copy_Descendants is
5484 use Atree.Unchecked_Access;
5485 -- This code section is part of the implementation of an untyped
5486 -- tree traversal, so it needs direct access to node fields.
5489 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5490 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5491 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5492 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
5493 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5494 end Copy_Descendants;
5496 -----------------------------
5497 -- Copy_Generic_Descendant --
5498 -----------------------------
5500 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
5502 if D = Union_Id (Empty) then
5505 elsif D in Node_Range then
5507 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
5509 elsif D in List_Range then
5510 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
5512 elsif D in Elist_Range then
5513 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
5515 -- Nothing else is copyable (e.g. Uint values), return as is
5520 end Copy_Generic_Descendant;
5522 ------------------------
5523 -- Copy_Generic_Elist --
5524 ------------------------
5526 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
5533 M := First_Elmt (E);
5534 while Present (M) loop
5536 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
5545 end Copy_Generic_Elist;
5547 -----------------------
5548 -- Copy_Generic_List --
5549 -----------------------
5551 function Copy_Generic_List
5553 Parent_Id : Node_Id) return List_Id
5561 Set_Parent (New_L, Parent_Id);
5564 while Present (N) loop
5565 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
5574 end Copy_Generic_List;
5576 ---------------------------
5577 -- In_Defining_Unit_Name --
5578 ---------------------------
5580 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
5582 return Present (Parent (Nam))
5583 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
5585 (Nkind (Parent (Nam)) = N_Expanded_Name
5586 and then In_Defining_Unit_Name (Parent (Nam))));
5587 end In_Defining_Unit_Name;
5589 -- Start of processing for Copy_Generic_Node
5596 New_N := New_Copy (N);
5598 if Instantiating then
5599 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
5602 if not Is_List_Member (N) then
5603 Set_Parent (New_N, Parent_Id);
5606 -- If defining identifier, then all fields have been copied already
5608 if Nkind (New_N) in N_Entity then
5611 -- Special casing for identifiers and other entity names and operators
5613 elsif Nkind (New_N) = N_Identifier
5614 or else Nkind (New_N) = N_Character_Literal
5615 or else Nkind (New_N) = N_Expanded_Name
5616 or else Nkind (New_N) = N_Operator_Symbol
5617 or else Nkind (New_N) in N_Op
5619 if not Instantiating then
5621 -- Link both nodes in order to assign subsequently the
5622 -- entity of the copy to the original node, in case this
5623 -- is a global reference.
5625 Set_Associated_Node (N, New_N);
5627 -- If we are within an instantiation, this is a nested generic
5628 -- that has already been analyzed at the point of definition. We
5629 -- must preserve references that were global to the enclosing
5630 -- parent at that point. Other occurrences, whether global or
5631 -- local to the current generic, must be resolved anew, so we
5632 -- reset the entity in the generic copy. A global reference has a
5633 -- smaller depth than the parent, or else the same depth in case
5634 -- both are distinct compilation units.
5635 -- A child unit is implicitly declared within the enclosing parent
5636 -- but is in fact global to it, and must be preserved.
5638 -- It is also possible for Current_Instantiated_Parent to be
5639 -- defined, and for this not to be a nested generic, namely if the
5640 -- unit is loaded through Rtsfind. In that case, the entity of
5641 -- New_N is only a link to the associated node, and not a defining
5644 -- The entities for parent units in the defining_program_unit of a
5645 -- generic child unit are established when the context of the unit
5646 -- is first analyzed, before the generic copy is made. They are
5647 -- preserved in the copy for use in ASIS queries.
5649 Ent := Entity (New_N);
5651 if No (Current_Instantiated_Parent.Gen_Id) then
5653 or else Nkind (Ent) /= N_Defining_Identifier
5654 or else not In_Defining_Unit_Name (N)
5656 Set_Associated_Node (New_N, Empty);
5661 not (Nkind (Ent) = N_Defining_Identifier
5663 Nkind (Ent) = N_Defining_Character_Literal
5665 Nkind (Ent) = N_Defining_Operator_Symbol)
5666 or else No (Scope (Ent))
5668 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
5669 and then not Is_Child_Unit (Ent))
5670 or else (Scope_Depth (Scope (Ent)) >
5671 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
5673 Get_Source_Unit (Ent) =
5674 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
5676 Set_Associated_Node (New_N, Empty);
5679 -- Case of instantiating identifier or some other name or operator
5682 -- If the associated node is still defined, the entity in it is
5683 -- global, and must be copied to the instance. If this copy is
5684 -- being made for a body to inline, it is applied to an
5685 -- instantiated tree, and the entity is already present and must
5686 -- be also preserved.
5689 Assoc : constant Node_Id := Get_Associated_Node (N);
5691 if Present (Assoc) then
5692 if Nkind (Assoc) = Nkind (N) then
5693 Set_Entity (New_N, Entity (Assoc));
5694 Check_Private_View (N);
5696 elsif Nkind (Assoc) = N_Function_Call then
5697 Set_Entity (New_N, Entity (Name (Assoc)));
5699 elsif (Nkind (Assoc) = N_Defining_Identifier
5700 or else Nkind (Assoc) = N_Defining_Character_Literal
5701 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
5702 and then Expander_Active
5704 -- Inlining case: we are copying a tree that contains
5705 -- global entities, which are preserved in the copy to be
5706 -- used for subsequent inlining.
5711 Set_Entity (New_N, Empty);
5717 -- For expanded name, we must copy the Prefix and Selector_Name
5719 if Nkind (N) = N_Expanded_Name then
5721 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
5723 Set_Selector_Name (New_N,
5724 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
5726 -- For operators, we must copy the right operand
5728 elsif Nkind (N) in N_Op then
5729 Set_Right_Opnd (New_N,
5730 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
5732 -- And for binary operators, the left operand as well
5734 if Nkind (N) in N_Binary_Op then
5735 Set_Left_Opnd (New_N,
5736 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
5740 -- Special casing for stubs
5742 elsif Nkind (N) in N_Body_Stub then
5744 -- In any case, we must copy the specification or defining
5745 -- identifier as appropriate.
5747 if Nkind (N) = N_Subprogram_Body_Stub then
5748 Set_Specification (New_N,
5749 Copy_Generic_Node (Specification (N), New_N, Instantiating));
5752 Set_Defining_Identifier (New_N,
5754 (Defining_Identifier (N), New_N, Instantiating));
5757 -- If we are not instantiating, then this is where we load and
5758 -- analyze subunits, i.e. at the point where the stub occurs. A
5759 -- more permissivle system might defer this analysis to the point
5760 -- of instantiation, but this seems to complicated for now.
5762 if not Instantiating then
5764 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
5766 Unum : Unit_Number_Type;
5772 (Load_Name => Subunit_Name,
5777 -- If the proper body is not found, a warning message will be
5778 -- emitted when analyzing the stub, or later at the the point
5779 -- of instantiation. Here we just leave the stub as is.
5781 if Unum = No_Unit then
5782 Subunits_Missing := True;
5783 goto Subunit_Not_Found;
5786 Subunit := Cunit (Unum);
5788 if Nkind (Unit (Subunit)) /= N_Subunit then
5790 ("found child unit instead of expected SEPARATE subunit",
5792 Error_Msg_Sloc := Sloc (N);
5793 Error_Msg_N ("\to complete stub #", Subunit);
5794 goto Subunit_Not_Found;
5797 -- We must create a generic copy of the subunit, in order to
5798 -- perform semantic analysis on it, and we must replace the
5799 -- stub in the original generic unit with the subunit, in order
5800 -- to preserve non-local references within.
5802 -- Only the proper body needs to be copied. Library_Unit and
5803 -- context clause are simply inherited by the generic copy.
5804 -- Note that the copy (which may be recursive if there are
5805 -- nested subunits) must be done first, before attaching it to
5806 -- the enclosing generic.
5810 (Proper_Body (Unit (Subunit)),
5811 Empty, Instantiating => False);
5813 -- Now place the original proper body in the original generic
5814 -- unit. This is a body, not a compilation unit.
5816 Rewrite (N, Proper_Body (Unit (Subunit)));
5817 Set_Is_Compilation_Unit (Defining_Entity (N), False);
5818 Set_Was_Originally_Stub (N);
5820 -- Finally replace the body of the subunit with its copy, and
5821 -- make this new subunit into the library unit of the generic
5822 -- copy, which does not have stubs any longer.
5824 Set_Proper_Body (Unit (Subunit), New_Body);
5825 Set_Library_Unit (New_N, Subunit);
5826 Inherit_Context (Unit (Subunit), N);
5829 -- If we are instantiating, this must be an error case, since
5830 -- otherwise we would have replaced the stub node by the proper body
5831 -- that corresponds. So just ignore it in the copy (i.e. we have
5832 -- copied it, and that is good enough).
5838 <<Subunit_Not_Found>> null;
5840 -- If the node is a compilation unit, it is the subunit of a stub, which
5841 -- has been loaded already (see code below). In this case, the library
5842 -- unit field of N points to the parent unit (which is a compilation
5843 -- unit) and need not (and cannot!) be copied.
5845 -- When the proper body of the stub is analyzed, thie library_unit link
5846 -- is used to establish the proper context (see sem_ch10).
5848 -- The other fields of a compilation unit are copied as usual
5850 elsif Nkind (N) = N_Compilation_Unit then
5852 -- This code can only be executed when not instantiating, because in
5853 -- the copy made for an instantiation, the compilation unit node has
5854 -- disappeared at the point that a stub is replaced by its proper
5857 pragma Assert (not Instantiating);
5859 Set_Context_Items (New_N,
5860 Copy_Generic_List (Context_Items (N), New_N));
5863 Copy_Generic_Node (Unit (N), New_N, False));
5865 Set_First_Inlined_Subprogram (New_N,
5867 (First_Inlined_Subprogram (N), New_N, False));
5869 Set_Aux_Decls_Node (New_N,
5870 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
5872 -- For an assignment node, the assignment is known to be semantically
5873 -- legal if we are instantiating the template. This avoids incorrect
5874 -- diagnostics in generated code.
5876 elsif Nkind (N) = N_Assignment_Statement then
5878 -- Copy name and expression fields in usual manner
5881 Copy_Generic_Node (Name (N), New_N, Instantiating));
5883 Set_Expression (New_N,
5884 Copy_Generic_Node (Expression (N), New_N, Instantiating));
5886 if Instantiating then
5887 Set_Assignment_OK (Name (New_N), True);
5890 elsif Nkind (N) = N_Aggregate
5891 or else Nkind (N) = N_Extension_Aggregate
5894 if not Instantiating then
5895 Set_Associated_Node (N, New_N);
5898 if Present (Get_Associated_Node (N))
5899 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
5901 -- In the generic the aggregate has some composite type. If at
5902 -- the point of instantiation the type has a private view,
5903 -- install the full view (and that of its ancestors, if any).
5906 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
5911 and then Is_Private_Type (T)
5917 and then Is_Tagged_Type (T)
5918 and then Is_Derived_Type (T)
5920 Rt := Root_Type (T);
5925 if Is_Private_Type (T) then
5936 -- Do not copy the associated node, which points to
5937 -- the generic copy of the aggregate.
5940 use Atree.Unchecked_Access;
5941 -- This code section is part of the implementation of an untyped
5942 -- tree traversal, so it needs direct access to node fields.
5945 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5946 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5947 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5948 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5951 -- Allocators do not have an identifier denoting the access type,
5952 -- so we must locate it through the expression to check whether
5953 -- the views are consistent.
5955 elsif Nkind (N) = N_Allocator
5956 and then Nkind (Expression (N)) = N_Qualified_Expression
5957 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
5958 and then Instantiating
5961 T : constant Node_Id :=
5962 Get_Associated_Node (Subtype_Mark (Expression (N)));
5968 -- Retrieve the allocator node in the generic copy
5970 Acc_T := Etype (Parent (Parent (T)));
5972 and then Is_Private_Type (Acc_T)
5974 Switch_View (Acc_T);
5981 -- For a proper body, we must catch the case of a proper body that
5982 -- replaces a stub. This represents the point at which a separate
5983 -- compilation unit, and hence template file, may be referenced, so we
5984 -- must make a new source instantiation entry for the template of the
5985 -- subunit, and ensure that all nodes in the subunit are adjusted using
5986 -- this new source instantiation entry.
5988 elsif Nkind (N) in N_Proper_Body then
5990 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
5993 if Instantiating and then Was_Originally_Stub (N) then
5994 Create_Instantiation_Source
5995 (Instantiation_Node,
5996 Defining_Entity (N),
6001 -- Now copy the fields of the proper body, using the new
6002 -- adjustment factor if one was needed as per test above.
6006 -- Restore the original adjustment factor in case changed
6008 S_Adjustment := Save_Adjustment;
6011 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6012 -- generic unit, not to the instantiating unit.
6014 elsif Nkind (N) = N_Pragma
6015 and then Instantiating
6018 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
6021 if Prag_Id = Pragma_Ident
6022 or else Prag_Id = Pragma_Comment
6024 New_N := Make_Null_Statement (Sloc (N));
6031 elsif Nkind (N) = N_Integer_Literal
6032 or else Nkind (N) = N_Real_Literal
6033 or else Nkind (N) = N_String_Literal
6035 -- No descendant fields need traversing
6039 -- For the remaining nodes, copy recursively their descendants
6045 and then Nkind (N) = N_Subprogram_Body
6047 Set_Generic_Parent (Specification (New_N), N);
6052 end Copy_Generic_Node;
6054 ----------------------------
6055 -- Denotes_Formal_Package --
6056 ----------------------------
6058 function Denotes_Formal_Package
6060 On_Exit : Boolean := False) return Boolean
6063 Scop : constant Entity_Id := Scope (Pack);
6070 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
6072 Par := Current_Instantiated_Parent.Act_Id;
6075 if Ekind (Scop) = E_Generic_Package
6076 or else Nkind (Unit_Declaration_Node (Scop)) =
6077 N_Generic_Subprogram_Declaration
6081 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
6082 N_Formal_Package_Declaration
6090 -- Check whether this package is associated with a formal package of
6091 -- the enclosing instantiation. Iterate over the list of renamings.
6093 E := First_Entity (Par);
6094 while Present (E) loop
6095 if Ekind (E) /= E_Package
6096 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
6100 elsif Renamed_Object (E) = Par then
6103 elsif Renamed_Object (E) = Pack then
6112 end Denotes_Formal_Package;
6118 procedure End_Generic is
6120 -- ??? More things could be factored out in this routine. Should
6121 -- probably be done at a later stage.
6123 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
6124 Generic_Flags.Decrement_Last;
6126 Expander_Mode_Restore;
6129 ----------------------
6130 -- Find_Actual_Type --
6131 ----------------------
6133 function Find_Actual_Type
6135 Gen_Scope : Entity_Id) return Entity_Id
6140 if not Is_Child_Unit (Gen_Scope) then
6141 return Get_Instance_Of (Typ);
6143 elsif not Is_Generic_Type (Typ)
6144 or else Scope (Typ) = Gen_Scope
6146 return Get_Instance_Of (Typ);
6149 T := Current_Entity (Typ);
6150 while Present (T) loop
6151 if In_Open_Scopes (Scope (T)) then
6154 elsif Is_Generic_Actual_Type (T) then
6163 end Find_Actual_Type;
6165 ----------------------------
6166 -- Freeze_Subprogram_Body --
6167 ----------------------------
6169 procedure Freeze_Subprogram_Body
6170 (Inst_Node : Node_Id;
6172 Pack_Id : Entity_Id)
6175 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6176 Par : constant Entity_Id := Scope (Gen_Unit);
6181 function Earlier (N1, N2 : Node_Id) return Boolean;
6182 -- Yields True if N1 and N2 appear in the same compilation unit,
6183 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6184 -- traversal of the tree for the unit.
6186 function Enclosing_Body (N : Node_Id) return Node_Id;
6187 -- Find innermost package body that encloses the given node, and which
6188 -- is not a compilation unit. Freeze nodes for the instance, or for its
6189 -- enclosing body, may be inserted after the enclosing_body of the
6192 function Package_Freeze_Node (B : Node_Id) return Node_Id;
6193 -- Find entity for given package body, and locate or create a freeze
6196 function True_Parent (N : Node_Id) return Node_Id;
6197 -- For a subunit, return parent of corresponding stub
6203 function Earlier (N1, N2 : Node_Id) return Boolean is
6209 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
6210 -- Find distance from given node to enclosing compilation unit
6216 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
6219 and then Nkind (P) /= N_Compilation_Unit
6221 P := True_Parent (P);
6226 -- Start of procesing for Earlier
6229 Find_Depth (P1, D1);
6230 Find_Depth (P2, D2);
6240 P1 := True_Parent (P1);
6245 P2 := True_Parent (P2);
6249 -- At this point P1 and P2 are at the same distance from the root.
6250 -- We examine their parents until we find a common declarative
6251 -- list, at which point we can establish their relative placement
6252 -- by comparing their ultimate slocs. If we reach the root,
6253 -- N1 and N2 do not descend from the same declarative list (e.g.
6254 -- one is nested in the declarative part and the other is in a block
6255 -- in the statement part) and the earlier one is already frozen.
6257 while not Is_List_Member (P1)
6258 or else not Is_List_Member (P2)
6259 or else List_Containing (P1) /= List_Containing (P2)
6261 P1 := True_Parent (P1);
6262 P2 := True_Parent (P2);
6264 if Nkind (Parent (P1)) = N_Subunit then
6265 P1 := Corresponding_Stub (Parent (P1));
6268 if Nkind (Parent (P2)) = N_Subunit then
6269 P2 := Corresponding_Stub (Parent (P2));
6278 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
6281 --------------------
6282 -- Enclosing_Body --
6283 --------------------
6285 function Enclosing_Body (N : Node_Id) return Node_Id is
6286 P : Node_Id := Parent (N);
6290 and then Nkind (Parent (P)) /= N_Compilation_Unit
6292 if Nkind (P) = N_Package_Body then
6294 if Nkind (Parent (P)) = N_Subunit then
6295 return Corresponding_Stub (Parent (P));
6301 P := True_Parent (P);
6307 -------------------------
6308 -- Package_Freeze_Node --
6309 -------------------------
6311 function Package_Freeze_Node (B : Node_Id) return Node_Id is
6315 if Nkind (B) = N_Package_Body then
6316 Id := Corresponding_Spec (B);
6318 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
6319 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
6322 Ensure_Freeze_Node (Id);
6323 return Freeze_Node (Id);
6324 end Package_Freeze_Node;
6330 function True_Parent (N : Node_Id) return Node_Id is
6332 if Nkind (Parent (N)) = N_Subunit then
6333 return Parent (Corresponding_Stub (Parent (N)));
6339 -- Start of processing of Freeze_Subprogram_Body
6342 -- If the instance and the generic body appear within the same unit, and
6343 -- the instance preceeds the generic, the freeze node for the instance
6344 -- must appear after that of the generic. If the generic is nested
6345 -- within another instance I2, then current instance must be frozen
6346 -- after I2. In both cases, the freeze nodes are those of enclosing
6347 -- packages. Otherwise, the freeze node is placed at the end of the
6348 -- current declarative part.
6350 Enc_G := Enclosing_Body (Gen_Body);
6351 Enc_I := Enclosing_Body (Inst_Node);
6352 Ensure_Freeze_Node (Pack_Id);
6353 F_Node := Freeze_Node (Pack_Id);
6355 if Is_Generic_Instance (Par)
6356 and then Present (Freeze_Node (Par))
6358 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
6360 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
6362 -- The parent was a premature instantiation. Insert freeze node at
6363 -- the end the current declarative part.
6365 Insert_After_Last_Decl (Inst_Node, F_Node);
6368 Insert_After (Freeze_Node (Par), F_Node);
6371 -- The body enclosing the instance should be frozen after the body that
6372 -- includes the generic, because the body of the instance may make
6373 -- references to entities therein. If the two are not in the same
6374 -- declarative part, or if the one enclosing the instance is frozen
6375 -- already, freeze the instance at the end of the current declarative
6378 elsif Is_Generic_Instance (Par)
6379 and then Present (Freeze_Node (Par))
6380 and then Present (Enc_I)
6382 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
6384 (Nkind (Enc_I) = N_Package_Body
6386 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
6388 -- The enclosing package may contain several instances. Rather
6389 -- than computing the earliest point at which to insert its
6390 -- freeze node, we place it at the end of the declarative part
6391 -- of the parent of the generic.
6393 Insert_After_Last_Decl
6394 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
6397 Insert_After_Last_Decl (Inst_Node, F_Node);
6399 elsif Present (Enc_G)
6400 and then Present (Enc_I)
6401 and then Enc_G /= Enc_I
6402 and then Earlier (Inst_Node, Gen_Body)
6404 if Nkind (Enc_G) = N_Package_Body then
6405 E_G_Id := Corresponding_Spec (Enc_G);
6406 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
6408 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
6411 -- Freeze package that encloses instance, and place node after
6412 -- package that encloses generic. If enclosing package is already
6413 -- frozen we have to assume it is at the proper place. This may be
6414 -- a potential ABE that requires dynamic checking.
6416 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
6418 -- Freeze enclosing subunit before instance
6420 Ensure_Freeze_Node (E_G_Id);
6422 if not Is_List_Member (Freeze_Node (E_G_Id)) then
6423 Insert_After (Enc_G, Freeze_Node (E_G_Id));
6426 Insert_After_Last_Decl (Inst_Node, F_Node);
6429 -- If none of the above, insert freeze node at the end of the current
6430 -- declarative part.
6432 Insert_After_Last_Decl (Inst_Node, F_Node);
6434 end Freeze_Subprogram_Body;
6440 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
6442 return Generic_Renamings.Table (E).Gen_Id;
6445 ---------------------
6446 -- Get_Instance_Of --
6447 ---------------------
6449 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
6450 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
6453 if Res /= Assoc_Null then
6454 return Generic_Renamings.Table (Res).Act_Id;
6456 -- On exit, entity is not instantiated: not a generic parameter, or
6457 -- else parameter of an inner generic unit.
6461 end Get_Instance_Of;
6463 ------------------------------------
6464 -- Get_Package_Instantiation_Node --
6465 ------------------------------------
6467 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
6468 Decl : Node_Id := Unit_Declaration_Node (A);
6472 -- If the Package_Instantiation attribute has been set on the package
6473 -- entity, then use it directly when it (or its Original_Node) refers
6474 -- to an N_Package_Instantiation node. In principle it should be
6475 -- possible to have this field set in all cases, which should be
6476 -- investigated, and would allow this function to be significantly
6479 if Present (Package_Instantiation (A)) then
6480 if Nkind (Package_Instantiation (A)) = N_Package_Instantiation then
6481 return Package_Instantiation (A);
6483 elsif Nkind (Original_Node (Package_Instantiation (A)))
6484 = N_Package_Instantiation
6486 return Original_Node (Package_Instantiation (A));
6490 -- If the instantiation is a compilation unit that does not need body
6491 -- then the instantiation node has been rewritten as a package
6492 -- declaration for the instance, and we return the original node.
6494 -- If it is a compilation unit and the instance node has not been
6495 -- rewritten, then it is still the unit of the compilation. Finally, if
6496 -- a body is present, this is a parent of the main unit whose body has
6497 -- been compiled for inlining purposes, and the instantiation node has
6498 -- been rewritten with the instance body.
6500 -- Otherwise the instantiation node appears after the declaration. If
6501 -- the entity is a formal package, the declaration may have been
6502 -- rewritten as a generic declaration (in the case of a formal with box)
6503 -- or left as a formal package declaration if it has actuals, and is
6504 -- found with a forward search.
6506 if Nkind (Parent (Decl)) = N_Compilation_Unit then
6507 if Nkind (Decl) = N_Package_Declaration
6508 and then Present (Corresponding_Body (Decl))
6510 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
6513 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
6514 return Original_Node (Decl);
6516 return Unit (Parent (Decl));
6519 elsif Nkind (Decl) = N_Package_Declaration
6520 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
6522 return Original_Node (Decl);
6525 Inst := Next (Decl);
6526 while Nkind (Inst) /= N_Package_Instantiation
6527 and then Nkind (Inst) /= N_Formal_Package_Declaration
6534 end Get_Package_Instantiation_Node;
6536 ------------------------
6537 -- Has_Been_Exchanged --
6538 ------------------------
6540 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
6544 Next := First_Elmt (Exchanged_Views);
6545 while Present (Next) loop
6546 if Full_View (Node (Next)) = E then
6554 end Has_Been_Exchanged;
6560 function Hash (F : Entity_Id) return HTable_Range is
6562 return HTable_Range (F mod HTable_Size);
6565 ------------------------
6566 -- Hide_Current_Scope --
6567 ------------------------
6569 procedure Hide_Current_Scope is
6570 C : constant Entity_Id := Current_Scope;
6574 Set_Is_Hidden_Open_Scope (C);
6576 E := First_Entity (C);
6577 while Present (E) loop
6578 if Is_Immediately_Visible (E) then
6579 Set_Is_Immediately_Visible (E, False);
6580 Append_Elmt (E, Hidden_Entities);
6586 -- Make the scope name invisible as well. This is necessary, but might
6587 -- conflict with calls to Rtsfind later on, in case the scope is a
6588 -- predefined one. There is no clean solution to this problem, so for
6589 -- now we depend on the user not redefining Standard itself in one of
6590 -- the parent units.
6592 if Is_Immediately_Visible (C)
6593 and then C /= Standard_Standard
6595 Set_Is_Immediately_Visible (C, False);
6596 Append_Elmt (C, Hidden_Entities);
6599 end Hide_Current_Scope;
6605 procedure Init_Env is
6606 Saved : Instance_Env;
6609 Saved.Instantiated_Parent := Current_Instantiated_Parent;
6610 Saved.Exchanged_Views := Exchanged_Views;
6611 Saved.Hidden_Entities := Hidden_Entities;
6612 Saved.Current_Sem_Unit := Current_Sem_Unit;
6613 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
6614 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
6616 -- Save configuration switches. These may be reset if the unit is a
6617 -- predefined unit, and the current mode is not Ada 2005.
6619 Save_Opt_Config_Switches (Saved.Switches);
6621 Instance_Envs.Append (Saved);
6623 Exchanged_Views := New_Elmt_List;
6624 Hidden_Entities := New_Elmt_List;
6626 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6627 -- this is set properly in Set_Instance_Env.
6629 Current_Instantiated_Parent :=
6630 (Current_Scope, Current_Scope, Assoc_Null);
6633 ------------------------------
6634 -- In_Same_Declarative_Part --
6635 ------------------------------
6637 function In_Same_Declarative_Part
6639 Inst : Node_Id) return Boolean
6641 Decls : constant Node_Id := Parent (F_Node);
6642 Nod : Node_Id := Parent (Inst);
6645 while Present (Nod) loop
6649 elsif Nkind (Nod) = N_Subprogram_Body
6650 or else Nkind (Nod) = N_Package_Body
6651 or else Nkind (Nod) = N_Task_Body
6652 or else Nkind (Nod) = N_Protected_Body
6653 or else Nkind (Nod) = N_Block_Statement
6657 elsif Nkind (Nod) = N_Subunit then
6658 Nod := Corresponding_Stub (Nod);
6660 elsif Nkind (Nod) = N_Compilation_Unit then
6663 Nod := Parent (Nod);
6668 end In_Same_Declarative_Part;
6670 ---------------------
6671 -- In_Main_Context --
6672 ---------------------
6674 function In_Main_Context (E : Entity_Id) return Boolean is
6680 if not Is_Compilation_Unit (E)
6681 or else Ekind (E) /= E_Package
6682 or else In_Private_Part (E)
6687 Context := Context_Items (Cunit (Main_Unit));
6689 Clause := First (Context);
6690 while Present (Clause) loop
6691 if Nkind (Clause) = N_With_Clause then
6692 Nam := Name (Clause);
6694 -- If the current scope is part of the context of the main unit,
6695 -- analysis of the corresponding with_clause is not complete, and
6696 -- the entity is not set. We use the Chars field directly, which
6697 -- might produce false positives in rare cases, but guarantees
6698 -- that we produce all the instance bodies we will need.
6700 if (Nkind (Nam) = N_Identifier
6701 and then Chars (Nam) = Chars (E))
6702 or else (Nkind (Nam) = N_Selected_Component
6703 and then Chars (Selector_Name (Nam)) = Chars (E))
6713 end In_Main_Context;
6715 ---------------------
6716 -- Inherit_Context --
6717 ---------------------
6719 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
6720 Current_Context : List_Id;
6721 Current_Unit : Node_Id;
6726 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
6728 -- The inherited context is attached to the enclosing compilation
6729 -- unit. This is either the main unit, or the declaration for the
6730 -- main unit (in case the instantation appears within the package
6731 -- declaration and the main unit is its body).
6733 Current_Unit := Parent (Inst);
6734 while Present (Current_Unit)
6735 and then Nkind (Current_Unit) /= N_Compilation_Unit
6737 Current_Unit := Parent (Current_Unit);
6740 Current_Context := Context_Items (Current_Unit);
6742 Item := First (Context_Items (Parent (Gen_Decl)));
6743 while Present (Item) loop
6744 if Nkind (Item) = N_With_Clause then
6745 New_I := New_Copy (Item);
6746 Set_Implicit_With (New_I, True);
6747 Append (New_I, Current_Context);
6753 end Inherit_Context;
6759 procedure Initialize is
6761 Generic_Renamings.Init;
6764 Generic_Renamings_HTable.Reset;
6765 Circularity_Detected := False;
6766 Exchanged_Views := No_Elist;
6767 Hidden_Entities := No_Elist;
6770 ----------------------------
6771 -- Insert_After_Last_Decl --
6772 ----------------------------
6774 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
6775 L : List_Id := List_Containing (N);
6776 P : constant Node_Id := Parent (L);
6779 if not Is_List_Member (F_Node) then
6780 if Nkind (P) = N_Package_Specification
6781 and then L = Visible_Declarations (P)
6782 and then Present (Private_Declarations (P))
6783 and then not Is_Empty_List (Private_Declarations (P))
6785 L := Private_Declarations (P);
6788 Insert_After (Last (L), F_Node);
6790 end Insert_After_Last_Decl;
6796 procedure Install_Body
6797 (Act_Body : Node_Id;
6802 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
6803 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
6804 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
6805 Par : constant Entity_Id := Scope (Gen_Id);
6806 Gen_Unit : constant Node_Id :=
6807 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
6808 Orig_Body : Node_Id := Gen_Body;
6810 Body_Unit : Node_Id;
6812 Must_Delay : Boolean;
6814 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
6815 -- Find subprogram (if any) that encloses instance and/or generic body
6817 function True_Sloc (N : Node_Id) return Source_Ptr;
6818 -- If the instance is nested inside a generic unit, the Sloc of the
6819 -- instance indicates the place of the original definition, not the
6820 -- point of the current enclosing instance. Pending a better usage of
6821 -- Slocs to indicate instantiation places, we determine the place of
6822 -- origin of a node by finding the maximum sloc of any ancestor node.
6823 -- Why is this not equivalent to Top_Level_Location ???
6825 --------------------
6826 -- Enclosing_Subp --
6827 --------------------
6829 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
6830 Scop : Entity_Id := Scope (Id);
6833 while Scop /= Standard_Standard
6834 and then not Is_Overloadable (Scop)
6836 Scop := Scope (Scop);
6846 function True_Sloc (N : Node_Id) return Source_Ptr is
6853 while Present (N1) and then N1 /= Act_Unit loop
6854 if Sloc (N1) > Res then
6864 -- Start of processing for Install_Body
6867 -- If the body is a subunit, the freeze point is the corresponding
6868 -- stub in the current compilation, not the subunit itself.
6870 if Nkind (Parent (Gen_Body)) = N_Subunit then
6871 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
6873 Orig_Body := Gen_Body;
6876 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
6878 -- If the instantiation and the generic definition appear in the same
6879 -- package declaration, this is an early instantiation. If they appear
6880 -- in the same declarative part, it is an early instantiation only if
6881 -- the generic body appears textually later, and the generic body is
6882 -- also in the main unit.
6884 -- If instance is nested within a subprogram, and the generic body is
6885 -- not, the instance is delayed because the enclosing body is. If
6886 -- instance and body are within the same scope, or the same sub-
6887 -- program body, indicate explicitly that the instance is delayed.
6890 (Gen_Unit = Act_Unit
6891 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
6892 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
6893 or else (Gen_Unit = Body_Unit
6894 and then True_Sloc (N) < Sloc (Orig_Body)))
6895 and then Is_In_Main_Unit (Gen_Unit)
6896 and then (Scope (Act_Id) = Scope (Gen_Id)
6898 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
6900 -- If this is an early instantiation, the freeze node is placed after
6901 -- the generic body. Otherwise, if the generic appears in an instance,
6902 -- we cannot freeze the current instance until the outer one is frozen.
6903 -- This is only relevant if the current instance is nested within some
6904 -- inner scope not itself within the outer instance. If this scope is
6905 -- a package body in the same declarative part as the outer instance,
6906 -- then that body needs to be frozen after the outer instance. Finally,
6907 -- if no delay is needed, we place the freeze node at the end of the
6908 -- current declarative part.
6910 if Expander_Active then
6911 Ensure_Freeze_Node (Act_Id);
6912 F_Node := Freeze_Node (Act_Id);
6915 Insert_After (Orig_Body, F_Node);
6917 elsif Is_Generic_Instance (Par)
6918 and then Present (Freeze_Node (Par))
6919 and then Scope (Act_Id) /= Par
6921 -- Freeze instance of inner generic after instance of enclosing
6924 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
6925 Insert_After (Freeze_Node (Par), F_Node);
6927 -- Freeze package enclosing instance of inner generic after
6928 -- instance of enclosing generic.
6930 elsif Nkind (Parent (N)) = N_Package_Body
6931 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
6935 Enclosing : constant Entity_Id :=
6936 Corresponding_Spec (Parent (N));
6939 Insert_After_Last_Decl (N, F_Node);
6940 Ensure_Freeze_Node (Enclosing);
6942 if not Is_List_Member (Freeze_Node (Enclosing)) then
6943 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
6948 Insert_After_Last_Decl (N, F_Node);
6952 Insert_After_Last_Decl (N, F_Node);
6956 Set_Is_Frozen (Act_Id);
6957 Insert_Before (N, Act_Body);
6958 Mark_Rewrite_Insertion (Act_Body);
6961 -----------------------------
6962 -- Install_Formal_Packages --
6963 -----------------------------
6965 procedure Install_Formal_Packages (Par : Entity_Id) is
6969 E := First_Entity (Par);
6970 while Present (E) loop
6971 if Ekind (E) = E_Package
6972 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
6974 -- If this is the renaming for the parent instance, done
6976 if Renamed_Object (E) = Par then
6979 -- The visibility of a formal of an enclosing generic is
6982 elsif Denotes_Formal_Package (E) then
6985 elsif Present (Associated_Formal_Package (E))
6986 and then Box_Present (Parent (Associated_Formal_Package (E)))
6988 Check_Generic_Actuals (Renamed_Object (E), True);
6989 Set_Is_Hidden (E, False);
6995 end Install_Formal_Packages;
6997 --------------------
6998 -- Install_Parent --
6999 --------------------
7001 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
7002 Ancestors : constant Elist_Id := New_Elmt_List;
7003 S : constant Entity_Id := Current_Scope;
7004 Inst_Par : Entity_Id;
7005 First_Par : Entity_Id;
7006 Inst_Node : Node_Id;
7007 Gen_Par : Entity_Id;
7008 First_Gen : Entity_Id;
7011 procedure Install_Noninstance_Specs (Par : Entity_Id);
7012 -- Install the scopes of noninstance parent units ending with Par
7014 procedure Install_Spec (Par : Entity_Id);
7015 -- The child unit is within the declarative part of the parent, so
7016 -- the declarations within the parent are immediately visible.
7018 -------------------------------
7019 -- Install_Noninstance_Specs --
7020 -------------------------------
7022 procedure Install_Noninstance_Specs (Par : Entity_Id) is
7025 and then Par /= Standard_Standard
7026 and then not In_Open_Scopes (Par)
7028 Install_Noninstance_Specs (Scope (Par));
7031 end Install_Noninstance_Specs;
7037 procedure Install_Spec (Par : Entity_Id) is
7038 Spec : constant Node_Id :=
7039 Specification (Unit_Declaration_Node (Par));
7042 -- If this parent of the child instance is a top-level unit,
7043 -- then record the unit and its visibility for later resetting
7044 -- in Remove_Parent. We exclude units that are generic instances,
7045 -- as we only want to record this information for the ultimate
7046 -- top-level noninstance parent (is that always correct???).
7048 if Scope (Par) = Standard_Standard
7049 and then not Is_Generic_Instance (Par)
7051 Parent_Unit_Visible := Is_Immediately_Visible (Par);
7052 Instance_Parent_Unit := Par;
7055 -- Open the parent scope and make it and its declarations visible.
7056 -- If this point is not within a body, then only the visible
7057 -- declarations should be made visible, and installation of the
7058 -- private declarations is deferred until the appropriate point
7059 -- within analysis of the spec being instantiated (see the handling
7060 -- of parent visibility in Analyze_Package_Specification). This is
7061 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7062 -- private view problems that occur when compiling instantiations of
7063 -- a generic child of that package (Generic_Dispatching_Constructor).
7064 -- If the instance freezes a tagged type, inlinings of operations
7065 -- from Ada.Tags may need the full view of type Tag. If inlining took
7066 -- proper account of establishing visibility of inlined subprograms'
7067 -- parents then it should be possible to remove this
7068 -- special check. ???
7071 Set_Is_Immediately_Visible (Par);
7072 Install_Visible_Declarations (Par);
7073 Set_Use (Visible_Declarations (Spec));
7075 if In_Body or else Is_RTU (Par, Ada_Tags) then
7076 Install_Private_Declarations (Par);
7077 Set_Use (Private_Declarations (Spec));
7081 -- Start of processing for Install_Parent
7084 -- We need to install the parent instance to compile the instantiation
7085 -- of the child, but the child instance must appear in the current
7086 -- scope. Given that we cannot place the parent above the current scope
7087 -- in the scope stack, we duplicate the current scope and unstack both
7088 -- after the instantiation is complete.
7090 -- If the parent is itself the instantiation of a child unit, we must
7091 -- also stack the instantiation of its parent, and so on. Each such
7092 -- ancestor is the prefix of the name in a prior instantiation.
7094 -- If this is a nested instance, the parent unit itself resolves to
7095 -- a renaming of the parent instance, whose declaration we need.
7097 -- Finally, the parent may be a generic (not an instance) when the
7098 -- child unit appears as a formal package.
7102 if Present (Renamed_Entity (Inst_Par)) then
7103 Inst_Par := Renamed_Entity (Inst_Par);
7106 First_Par := Inst_Par;
7109 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
7111 First_Gen := Gen_Par;
7113 while Present (Gen_Par)
7114 and then Is_Child_Unit (Gen_Par)
7116 -- Load grandparent instance as well
7118 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
7120 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
7121 Inst_Par := Entity (Prefix (Name (Inst_Node)));
7123 if Present (Renamed_Entity (Inst_Par)) then
7124 Inst_Par := Renamed_Entity (Inst_Par);
7129 (Specification (Unit_Declaration_Node (Inst_Par)));
7131 if Present (Gen_Par) then
7132 Prepend_Elmt (Inst_Par, Ancestors);
7135 -- Parent is not the name of an instantiation
7137 Install_Noninstance_Specs (Inst_Par);
7149 if Present (First_Gen) then
7150 Append_Elmt (First_Par, Ancestors);
7153 Install_Noninstance_Specs (First_Par);
7156 if not Is_Empty_Elmt_List (Ancestors) then
7157 Elmt := First_Elmt (Ancestors);
7159 while Present (Elmt) loop
7160 Install_Spec (Node (Elmt));
7161 Install_Formal_Packages (Node (Elmt));
7172 --------------------------------
7173 -- Instantiate_Formal_Package --
7174 --------------------------------
7176 function Instantiate_Formal_Package
7179 Analyzed_Formal : Node_Id) return List_Id
7181 Loc : constant Source_Ptr := Sloc (Actual);
7182 Actual_Pack : Entity_Id;
7183 Formal_Pack : Entity_Id;
7184 Gen_Parent : Entity_Id;
7187 Parent_Spec : Node_Id;
7189 procedure Find_Matching_Actual
7191 Act : in out Entity_Id);
7192 -- We need to associate each formal entity in the formal package
7193 -- with the corresponding entity in the actual package. The actual
7194 -- package has been analyzed and possibly expanded, and as a result
7195 -- there is no one-to-one correspondence between the two lists (for
7196 -- example, the actual may include subtypes, itypes, and inherited
7197 -- primitive operations, interspersed among the renaming declarations
7198 -- for the actuals) . We retrieve the corresponding actual by name
7199 -- because each actual has the same name as the formal, and they do
7200 -- appear in the same order.
7202 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
7203 -- Retrieve entity of defining entity of generic formal parameter.
7204 -- Only the declarations of formals need to be considered when
7205 -- linking them to actuals, but the declarative list may include
7206 -- internal entities generated during analysis, and those are ignored.
7208 procedure Match_Formal_Entity
7209 (Formal_Node : Node_Id;
7210 Formal_Ent : Entity_Id;
7211 Actual_Ent : Entity_Id);
7212 -- Associates the formal entity with the actual. In the case
7213 -- where Formal_Ent is a formal package, this procedure iterates
7214 -- through all of its formals and enters associations betwen the
7215 -- actuals occurring in the formal package's corresponding actual
7216 -- package (given by Actual_Ent) and the formal package's formal
7217 -- parameters. This procedure recurses if any of the parameters is
7218 -- itself a package.
7220 function Is_Instance_Of
7221 (Act_Spec : Entity_Id;
7222 Gen_Anc : Entity_Id) return Boolean;
7223 -- The actual can be an instantiation of a generic within another
7224 -- instance, in which case there is no direct link from it to the
7225 -- original generic ancestor. In that case, we recognize that the
7226 -- ultimate ancestor is the same by examining names and scopes.
7228 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
7229 -- Within the generic part, entities in the formal package are
7230 -- visible. To validate subsequent type declarations, indicate
7231 -- the correspondence betwen the entities in the analyzed formal,
7232 -- and the entities in the actual package. There are three packages
7233 -- involved in the instantiation of a formal package: the parent
7234 -- generic P1 which appears in the generic declaration, the fake
7235 -- instantiation P2 which appears in the analyzed generic, and whose
7236 -- visible entities may be used in subsequent formals, and the actual
7237 -- P3 in the instance. To validate subsequent formals, me indicate
7238 -- that the entities in P2 are mapped into those of P3. The mapping of
7239 -- entities has to be done recursively for nested packages.
7241 procedure Process_Nested_Formal (Formal : Entity_Id);
7242 -- If the current formal is declared with a box, its own formals are
7243 -- visible in the instance, as they were in the generic, and their
7244 -- Hidden flag must be reset. If some of these formals are themselves
7245 -- packages declared with a box, the processing must be recursive.
7247 --------------------------
7248 -- Find_Matching_Actual --
7249 --------------------------
7251 procedure Find_Matching_Actual
7253 Act : in out Entity_Id)
7255 Formal_Ent : Entity_Id;
7258 case Nkind (Original_Node (F)) is
7259 when N_Formal_Object_Declaration |
7260 N_Formal_Type_Declaration =>
7261 Formal_Ent := Defining_Identifier (F);
7263 while Chars (Act) /= Chars (Formal_Ent) loop
7267 when N_Formal_Subprogram_Declaration |
7268 N_Formal_Package_Declaration |
7269 N_Package_Declaration |
7270 N_Generic_Package_Declaration =>
7271 Formal_Ent := Defining_Entity (F);
7273 while Chars (Act) /= Chars (Formal_Ent) loop
7278 raise Program_Error;
7280 end Find_Matching_Actual;
7282 -------------------------
7283 -- Match_Formal_Entity --
7284 -------------------------
7286 procedure Match_Formal_Entity
7287 (Formal_Node : Node_Id;
7288 Formal_Ent : Entity_Id;
7289 Actual_Ent : Entity_Id)
7291 Act_Pkg : Entity_Id;
7294 Set_Instance_Of (Formal_Ent, Actual_Ent);
7296 if Ekind (Actual_Ent) = E_Package then
7298 -- Record associations for each parameter
7300 Act_Pkg := Actual_Ent;
7303 A_Ent : Entity_Id := First_Entity (Act_Pkg);
7312 -- Retrieve the actual given in the formal package declaration
7314 Actual := Entity (Name (Original_Node (Formal_Node)));
7316 -- The actual in the formal package declaration may be a
7317 -- renamed generic package, in which case we want to retrieve
7318 -- the original generic in order to traverse its formal part.
7320 if Present (Renamed_Entity (Actual)) then
7321 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
7323 Gen_Decl := Unit_Declaration_Node (Actual);
7326 Formals := Generic_Formal_Declarations (Gen_Decl);
7328 if Present (Formals) then
7329 F_Node := First_Non_Pragma (Formals);
7334 while Present (A_Ent)
7335 and then Present (F_Node)
7336 and then A_Ent /= First_Private_Entity (Act_Pkg)
7338 F_Ent := Get_Formal_Entity (F_Node);
7340 if Present (F_Ent) then
7342 -- This is a formal of the original package. Record
7343 -- association and recurse.
7345 Find_Matching_Actual (F_Node, A_Ent);
7346 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
7347 Next_Entity (A_Ent);
7350 Next_Non_Pragma (F_Node);
7354 end Match_Formal_Entity;
7356 -----------------------
7357 -- Get_Formal_Entity --
7358 -----------------------
7360 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
7361 Kind : constant Node_Kind := Nkind (Original_Node (N));
7364 when N_Formal_Object_Declaration =>
7365 return Defining_Identifier (N);
7367 when N_Formal_Type_Declaration =>
7368 return Defining_Identifier (N);
7370 when N_Formal_Subprogram_Declaration =>
7371 return Defining_Unit_Name (Specification (N));
7373 when N_Formal_Package_Declaration =>
7374 return Defining_Identifier (Original_Node (N));
7376 when N_Generic_Package_Declaration =>
7377 return Defining_Identifier (Original_Node (N));
7379 -- All other declarations are introduced by semantic analysis and
7380 -- have no match in the actual.
7385 end Get_Formal_Entity;
7387 --------------------
7388 -- Is_Instance_Of --
7389 --------------------
7391 function Is_Instance_Of
7392 (Act_Spec : Entity_Id;
7393 Gen_Anc : Entity_Id) return Boolean
7395 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
7398 if No (Gen_Par) then
7401 -- Simplest case: the generic parent of the actual is the formal
7403 elsif Gen_Par = Gen_Anc then
7406 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
7409 -- The actual may be obtained through several instantiations. Its
7410 -- scope must itself be an instance of a generic declared in the
7411 -- same scope as the formal. Any other case is detected above.
7413 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
7417 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
7425 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
7430 Set_Instance_Of (Form, Act);
7432 -- Traverse formal and actual package to map the corresponding
7433 -- entities. We skip over internal entities that may be generated
7434 -- during semantic analysis, and find the matching entities by
7435 -- name, given that they must appear in the same order.
7437 E1 := First_Entity (Form);
7438 E2 := First_Entity (Act);
7440 and then E1 /= First_Private_Entity (Form)
7442 -- Could this test be a single condition???
7443 -- Seems like it could, and isn't FPE (Form) a constant anyway???
7445 if not Is_Internal (E1)
7446 and then Present (Parent (E1))
7447 and then not Is_Class_Wide_Type (E1)
7448 and then not Is_Internal_Name (Chars (E1))
7451 and then Chars (E2) /= Chars (E1)
7459 Set_Instance_Of (E1, E2);
7462 and then Is_Tagged_Type (E2)
7465 (Class_Wide_Type (E1), Class_Wide_Type (E2));
7468 if Ekind (E1) = E_Package
7469 and then No (Renamed_Object (E1))
7471 Map_Entities (E1, E2);
7480 ---------------------------
7481 -- Process_Nested_Formal --
7482 ---------------------------
7484 procedure Process_Nested_Formal (Formal : Entity_Id) is
7488 if Present (Associated_Formal_Package (Formal))
7489 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
7491 Ent := First_Entity (Formal);
7492 while Present (Ent) loop
7493 Set_Is_Hidden (Ent, False);
7494 Set_Is_Visible_Formal (Ent);
7495 Set_Is_Potentially_Use_Visible
7496 (Ent, Is_Potentially_Use_Visible (Formal));
7498 if Ekind (Ent) = E_Package then
7499 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
7500 Process_Nested_Formal (Ent);
7506 end Process_Nested_Formal;
7508 -- Start of processing for Instantiate_Formal_Package
7513 if not Is_Entity_Name (Actual)
7514 or else Ekind (Entity (Actual)) /= E_Package
7517 ("expect package instance to instantiate formal", Actual);
7518 Abandon_Instantiation (Actual);
7519 raise Program_Error;
7522 Actual_Pack := Entity (Actual);
7523 Set_Is_Instantiated (Actual_Pack);
7525 -- The actual may be a renamed package, or an outer generic formal
7526 -- package whose instantiation is converted into a renaming.
7528 if Present (Renamed_Object (Actual_Pack)) then
7529 Actual_Pack := Renamed_Object (Actual_Pack);
7532 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
7533 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
7534 Formal_Pack := Defining_Identifier (Analyzed_Formal);
7537 Generic_Parent (Specification (Analyzed_Formal));
7539 Defining_Unit_Name (Specification (Analyzed_Formal));
7542 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
7543 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
7545 Parent_Spec := Parent (Actual_Pack);
7548 if Gen_Parent = Any_Id then
7550 ("previous error in declaration of formal package", Actual);
7551 Abandon_Instantiation (Actual);
7554 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
7560 ("actual parameter must be instance of&", Actual, Gen_Parent);
7561 Abandon_Instantiation (Actual);
7564 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
7565 Map_Entities (Formal_Pack, Actual_Pack);
7568 Make_Package_Renaming_Declaration (Loc,
7569 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
7570 Name => New_Reference_To (Actual_Pack, Loc));
7572 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
7573 Defining_Identifier (Formal));
7574 Decls := New_List (Nod);
7576 -- If the formal F has a box, then the generic declarations are
7577 -- visible in the generic G. In an instance of G, the corresponding
7578 -- entities in the actual for F (which are the actuals for the
7579 -- instantiation of the generic that F denotes) must also be made
7580 -- visible for analysis of the current instance. On exit from the
7581 -- current instance, those entities are made private again. If the
7582 -- actual is currently in use, these entities are also use-visible.
7584 -- The loop through the actual entities also steps through the formal
7585 -- entities and enters associations from formals to actuals into the
7586 -- renaming map. This is necessary to properly handle checking of
7587 -- actual parameter associations for later formals that depend on
7588 -- actuals declared in the formal package.
7590 -- In Ada 2005, partial parametrization requires that we make visible
7591 -- the actuals corresponding to formals that were defaulted in the
7592 -- formal package. There formals are identified because they remain
7593 -- formal generics within the formal package, rather than being
7594 -- renamings of the actuals supplied.
7597 Gen_Decl : constant Node_Id :=
7598 Unit_Declaration_Node (Gen_Parent);
7599 Formals : constant List_Id :=
7600 Generic_Formal_Declarations (Gen_Decl);
7602 Actual_Ent : Entity_Id;
7603 Actual_Of_Formal : Node_Id;
7604 Formal_Node : Node_Id;
7605 Formal_Ent : Entity_Id;
7608 if Present (Formals) then
7609 Formal_Node := First_Non_Pragma (Formals);
7611 Formal_Node := Empty;
7614 Actual_Ent := First_Entity (Actual_Pack);
7616 First (Visible_Declarations (Specification (Analyzed_Formal)));
7617 while Present (Actual_Ent)
7618 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7620 if Present (Formal_Node) then
7621 Formal_Ent := Get_Formal_Entity (Formal_Node);
7623 if Present (Formal_Ent) then
7624 Find_Matching_Actual (Formal_Node, Actual_Ent);
7626 (Formal_Node, Formal_Ent, Actual_Ent);
7628 -- We iterate at the same time over the actuals of the
7629 -- local package created for the formal, to determine
7630 -- which one of the formals of the original generic were
7631 -- defaulted in the formal. The corresponding actual
7632 -- entities are visible in the enclosing instance.
7634 if Box_Present (Formal)
7636 (Present (Actual_Of_Formal)
7639 (Get_Formal_Entity (Actual_Of_Formal)))
7641 Set_Is_Hidden (Actual_Ent, False);
7642 Set_Is_Visible_Formal (Actual_Ent);
7643 Set_Is_Potentially_Use_Visible
7644 (Actual_Ent, In_Use (Actual_Pack));
7646 if Ekind (Actual_Ent) = E_Package then
7647 Process_Nested_Formal (Actual_Ent);
7651 Set_Is_Hidden (Actual_Ent);
7652 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
7656 Next_Non_Pragma (Formal_Node);
7657 Next (Actual_Of_Formal);
7660 -- No further formals to match, but the generic part may
7661 -- contain inherited operation that are not hidden in the
7662 -- enclosing instance.
7664 Next_Entity (Actual_Ent);
7668 -- Inherited subprograms generated by formal derived types are
7669 -- also visible if the types are.
7671 Actual_Ent := First_Entity (Actual_Pack);
7672 while Present (Actual_Ent)
7673 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
7675 if Is_Overloadable (Actual_Ent)
7677 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
7679 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
7681 Set_Is_Hidden (Actual_Ent, False);
7682 Set_Is_Potentially_Use_Visible
7683 (Actual_Ent, In_Use (Actual_Pack));
7686 Next_Entity (Actual_Ent);
7690 -- If the formal is not declared with a box, reanalyze it as an
7691 -- abbreviated instantiation, to verify the matching rules of 12.7.
7692 -- The actual checks are performed after the generic associations
7693 -- have been analyzed, to guarantee the same visibility for this
7694 -- instantiation and for the actuals.
7696 -- In Ada 2005, the generic associations for the formal can include
7697 -- defaulted parameters. These are ignored during check. This
7698 -- internal instantiation is removed from the tree after conformance
7699 -- checking, because it contains formal declarations for those
7700 -- defaulted parameters, and those should not reach the back-end.
7702 if not Box_Present (Formal) then
7704 I_Pack : constant Entity_Id :=
7705 Make_Defining_Identifier (Sloc (Actual),
7706 Chars => New_Internal_Name ('P'));
7709 Set_Is_Internal (I_Pack);
7712 Make_Package_Instantiation (Sloc (Actual),
7713 Defining_Unit_Name => I_Pack,
7716 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
7717 Generic_Associations =>
7718 Generic_Associations (Formal)));
7724 end Instantiate_Formal_Package;
7726 -----------------------------------
7727 -- Instantiate_Formal_Subprogram --
7728 -----------------------------------
7730 function Instantiate_Formal_Subprogram
7733 Analyzed_Formal : Node_Id) return Node_Id
7736 Formal_Sub : constant Entity_Id :=
7737 Defining_Unit_Name (Specification (Formal));
7738 Analyzed_S : constant Entity_Id :=
7739 Defining_Unit_Name (Specification (Analyzed_Formal));
7740 Decl_Node : Node_Id;
7744 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
7745 -- If the generic is a child unit, the parent has been installed on the
7746 -- scope stack, but a default subprogram cannot resolve to something on
7747 -- the parent because that parent is not really part of the visible
7748 -- context (it is there to resolve explicit local entities). If the
7749 -- default has resolved in this way, we remove the entity from
7750 -- immediate visibility and analyze the node again to emit an error
7751 -- message or find another visible candidate.
7753 procedure Valid_Actual_Subprogram (Act : Node_Id);
7754 -- Perform legality check and raise exception on failure
7756 -----------------------
7757 -- From_Parent_Scope --
7758 -----------------------
7760 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
7761 Gen_Scope : Node_Id;
7764 Gen_Scope := Scope (Analyzed_S);
7765 while Present (Gen_Scope)
7766 and then Is_Child_Unit (Gen_Scope)
7768 if Scope (Subp) = Scope (Gen_Scope) then
7772 Gen_Scope := Scope (Gen_Scope);
7776 end From_Parent_Scope;
7778 -----------------------------
7779 -- Valid_Actual_Subprogram --
7780 -----------------------------
7782 procedure Valid_Actual_Subprogram (Act : Node_Id) is
7786 if Is_Entity_Name (Act) then
7787 Act_E := Entity (Act);
7789 elsif Nkind (Act) = N_Selected_Component
7790 and then Is_Entity_Name (Selector_Name (Act))
7792 Act_E := Entity (Selector_Name (Act));
7798 if (Present (Act_E) and then Is_Overloadable (Act_E))
7799 or else Nkind (Act) = N_Attribute_Reference
7800 or else Nkind (Act) = N_Indexed_Component
7801 or else Nkind (Act) = N_Character_Literal
7802 or else Nkind (Act) = N_Explicit_Dereference
7808 ("expect subprogram or entry name in instantiation of&",
7809 Instantiation_Node, Formal_Sub);
7810 Abandon_Instantiation (Instantiation_Node);
7812 end Valid_Actual_Subprogram;
7814 -- Start of processing for Instantiate_Formal_Subprogram
7817 New_Spec := New_Copy_Tree (Specification (Formal));
7819 -- The tree copy has created the proper instantiation sloc for the
7820 -- new specification. Use this location for all other constructed
7823 Loc := Sloc (Defining_Unit_Name (New_Spec));
7825 -- Create new entity for the actual (New_Copy_Tree does not)
7827 Set_Defining_Unit_Name
7828 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7830 -- Create new entities for the each of the formals in the
7831 -- specification of the renaming declaration built for the actual.
7833 if Present (Parameter_Specifications (New_Spec)) then
7837 F := First (Parameter_Specifications (New_Spec));
7838 while Present (F) loop
7839 Set_Defining_Identifier (F,
7840 Make_Defining_Identifier (Loc,
7841 Chars => Chars (Defining_Identifier (F))));
7847 -- Find entity of actual. If the actual is an attribute reference, it
7848 -- cannot be resolved here (its formal is missing) but is handled
7849 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7850 -- fully resolved subsequently, when the renaming declaration for the
7851 -- formal is analyzed. If it is an explicit dereference, resolve the
7852 -- prefix but not the actual itself, to prevent interpretation as call.
7854 if Present (Actual) then
7855 Loc := Sloc (Actual);
7856 Set_Sloc (New_Spec, Loc);
7858 if Nkind (Actual) = N_Operator_Symbol then
7859 Find_Direct_Name (Actual);
7861 elsif Nkind (Actual) = N_Explicit_Dereference then
7862 Analyze (Prefix (Actual));
7864 elsif Nkind (Actual) /= N_Attribute_Reference then
7868 Valid_Actual_Subprogram (Actual);
7871 elsif Present (Default_Name (Formal)) then
7872 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
7873 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
7874 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
7875 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
7876 and then Present (Entity (Default_Name (Formal)))
7878 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
7880 Nam := New_Copy (Default_Name (Formal));
7881 Set_Sloc (Nam, Loc);
7884 elsif Box_Present (Formal) then
7886 -- Actual is resolved at the point of instantiation. Create an
7887 -- identifier or operator with the same name as the formal.
7889 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
7890 Nam := Make_Operator_Symbol (Loc,
7891 Chars => Chars (Formal_Sub),
7892 Strval => No_String);
7894 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
7897 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
7898 and then Null_Present (Specification (Formal))
7900 -- Generate null body for procedure, for use in the instance
7903 Make_Subprogram_Body (Loc,
7904 Specification => New_Spec,
7905 Declarations => New_List,
7906 Handled_Statement_Sequence =>
7907 Make_Handled_Sequence_Of_Statements (Loc,
7908 Statements => New_List (Make_Null_Statement (Loc))));
7910 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
7914 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
7916 ("missing actual&", Instantiation_Node, Formal_Sub);
7918 ("\in instantiation of & declared#",
7919 Instantiation_Node, Scope (Analyzed_S));
7920 Abandon_Instantiation (Instantiation_Node);
7924 Make_Subprogram_Renaming_Declaration (Loc,
7925 Specification => New_Spec,
7928 -- If we do not have an actual and the formal specified <> then set to
7929 -- get proper default.
7931 if No (Actual) and then Box_Present (Formal) then
7932 Set_From_Default (Decl_Node);
7935 -- Gather possible interpretations for the actual before analyzing the
7936 -- instance. If overloaded, it will be resolved when analyzing the
7937 -- renaming declaration.
7939 if Box_Present (Formal)
7940 and then No (Actual)
7944 if Is_Child_Unit (Scope (Analyzed_S))
7945 and then Present (Entity (Nam))
7947 if not Is_Overloaded (Nam) then
7949 if From_Parent_Scope (Entity (Nam)) then
7950 Set_Is_Immediately_Visible (Entity (Nam), False);
7951 Set_Entity (Nam, Empty);
7952 Set_Etype (Nam, Empty);
7956 Set_Is_Immediately_Visible (Entity (Nam));
7965 Get_First_Interp (Nam, I, It);
7967 while Present (It.Nam) loop
7968 if From_Parent_Scope (It.Nam) then
7972 Get_Next_Interp (I, It);
7979 -- The generic instantiation freezes the actual. This can only be done
7980 -- once the actual is resolved, in the analysis of the renaming
7981 -- declaration. To make the formal subprogram entity available, we set
7982 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7983 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7984 -- of formal abstract subprograms.
7986 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
7988 -- We cannot analyze the renaming declaration, and thus find the actual,
7989 -- until all the actuals are assembled in the instance. For subsequent
7990 -- checks of other actuals, indicate the node that will hold the
7991 -- instance of this formal.
7993 Set_Instance_Of (Analyzed_S, Nam);
7995 if Nkind (Actual) = N_Selected_Component
7996 and then Is_Task_Type (Etype (Prefix (Actual)))
7997 and then not Is_Frozen (Etype (Prefix (Actual)))
7999 -- The renaming declaration will create a body, which must appear
8000 -- outside of the instantiation, We move the renaming declaration
8001 -- out of the instance, and create an additional renaming inside,
8002 -- to prevent freezing anomalies.
8005 Anon_Id : constant Entity_Id :=
8006 Make_Defining_Identifier
8007 (Loc, New_Internal_Name ('E'));
8009 Set_Defining_Unit_Name (New_Spec, Anon_Id);
8010 Insert_Before (Instantiation_Node, Decl_Node);
8011 Analyze (Decl_Node);
8013 -- Now create renaming within the instance
8016 Make_Subprogram_Renaming_Declaration (Loc,
8017 Specification => New_Copy_Tree (New_Spec),
8018 Name => New_Occurrence_Of (Anon_Id, Loc));
8020 Set_Defining_Unit_Name (Specification (Decl_Node),
8021 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
8026 end Instantiate_Formal_Subprogram;
8028 ------------------------
8029 -- Instantiate_Object --
8030 ------------------------
8032 function Instantiate_Object
8035 Analyzed_Formal : Node_Id) return List_Id
8037 Acc_Def : Node_Id := Empty;
8038 Act_Assoc : constant Node_Id := Parent (Actual);
8039 Actual_Decl : Node_Id := Empty;
8040 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
8041 Decl_Node : Node_Id;
8044 List : constant List_Id := New_List;
8045 Loc : constant Source_Ptr := Sloc (Actual);
8046 Orig_Ftyp : constant Entity_Id :=
8047 Etype (Defining_Identifier (Analyzed_Formal));
8048 Subt_Decl : Node_Id := Empty;
8049 Subt_Mark : Node_Id := Empty;
8052 if Present (Subtype_Mark (Formal)) then
8053 Subt_Mark := Subtype_Mark (Formal);
8055 Check_Access_Definition (Formal);
8056 Acc_Def := Access_Definition (Formal);
8059 -- Sloc for error message on missing actual
8061 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
8063 if Get_Instance_Of (Formal_Id) /= Formal_Id then
8064 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
8067 Set_Parent (List, Parent (Actual));
8071 if Out_Present (Formal) then
8073 -- An IN OUT generic actual must be a name. The instantiation is a
8074 -- renaming declaration. The actual is the name being renamed. We
8075 -- use the actual directly, rather than a copy, because it is not
8076 -- used further in the list of actuals, and because a copy or a use
8077 -- of relocate_node is incorrect if the instance is nested within a
8078 -- generic. In order to simplify ASIS searches, the Generic_Parent
8079 -- field links the declaration to the generic association.
8084 Instantiation_Node, Formal_Id);
8086 ("\in instantiation of & declared#",
8088 Scope (Defining_Identifier (Analyzed_Formal)));
8089 Abandon_Instantiation (Instantiation_Node);
8092 if Present (Subt_Mark) then
8094 Make_Object_Renaming_Declaration (Loc,
8095 Defining_Identifier => New_Copy (Formal_Id),
8096 Subtype_Mark => New_Copy_Tree (Subt_Mark),
8099 else pragma Assert (Present (Acc_Def));
8101 Make_Object_Renaming_Declaration (Loc,
8102 Defining_Identifier => New_Copy (Formal_Id),
8103 Access_Definition => New_Copy_Tree (Acc_Def),
8107 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8109 -- The analysis of the actual may produce insert_action nodes, so
8110 -- the declaration must have a context in which to attach them.
8112 Append (Decl_Node, List);
8115 -- Return if the analysis of the actual reported some error
8117 if Etype (Actual) = Any_Type then
8121 -- This check is performed here because Analyze_Object_Renaming will
8122 -- not check it when Comes_From_Source is False. Note though that the
8123 -- check for the actual being the name of an object will be performed
8124 -- in Analyze_Object_Renaming.
8126 if Is_Object_Reference (Actual)
8127 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
8130 ("illegal discriminant-dependent component for in out parameter",
8134 -- The actual has to be resolved in order to check that it is a
8135 -- variable (due to cases such as F(1), where F returns
8136 -- access to an array, and for overloaded prefixes).
8139 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
8141 if Is_Private_Type (Ftyp)
8142 and then not Is_Private_Type (Etype (Actual))
8143 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
8144 or else Base_Type (Etype (Actual)) = Ftyp)
8146 -- If the actual has the type of the full view of the formal, or
8147 -- else a non-private subtype of the formal, then the visibility
8148 -- of the formal type has changed. Add to the actuals a subtype
8149 -- declaration that will force the exchange of views in the body
8150 -- of the instance as well.
8153 Make_Subtype_Declaration (Loc,
8154 Defining_Identifier =>
8155 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
8156 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
8158 Prepend (Subt_Decl, List);
8160 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
8161 Exchange_Declarations (Ftyp);
8164 Resolve (Actual, Ftyp);
8166 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
8168 ("actual for& must be a variable", Actual, Formal_Id);
8170 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
8172 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8173 -- the type of the actual shall resolve to a specific anonymous
8176 if Ada_Version < Ada_05
8178 Ekind (Base_Type (Ftyp)) /=
8179 E_Anonymous_Access_Type
8181 Ekind (Base_Type (Etype (Actual))) /=
8182 E_Anonymous_Access_Type
8184 Error_Msg_NE ("type of actual does not match type of&",
8189 Note_Possible_Modification (Actual);
8191 -- Check for instantiation of atomic/volatile actual for
8192 -- non-atomic/volatile formal (RM C.6 (12)).
8194 if Is_Atomic_Object (Actual)
8195 and then not Is_Atomic (Orig_Ftyp)
8198 ("cannot instantiate non-atomic formal object " &
8199 "with atomic actual", Actual);
8201 elsif Is_Volatile_Object (Actual)
8202 and then not Is_Volatile (Orig_Ftyp)
8205 ("cannot instantiate non-volatile formal object " &
8206 "with volatile actual", Actual);
8212 -- The instantiation of a generic formal in-parameter is constant
8213 -- declaration. The actual is the expression for that declaration.
8215 if Present (Actual) then
8216 if Present (Subt_Mark) then
8218 else pragma Assert (Present (Acc_Def));
8223 Make_Object_Declaration (Loc,
8224 Defining_Identifier => New_Copy (Formal_Id),
8225 Constant_Present => True,
8226 Object_Definition => New_Copy_Tree (Def),
8227 Expression => Actual);
8229 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
8231 -- A generic formal object of a tagged type is defined to be
8232 -- aliased so the new constant must also be treated as aliased.
8235 (Etype (Defining_Identifier (Analyzed_Formal)))
8237 Set_Aliased_Present (Decl_Node);
8240 Append (Decl_Node, List);
8242 -- No need to repeat (pre-)analysis of some expression nodes
8243 -- already handled in Pre_Analyze_Actuals.
8245 if Nkind (Actual) /= N_Allocator then
8248 -- Return if the analysis of the actual reported some error
8250 if Etype (Actual) = Any_Type then
8256 Typ : constant Entity_Id :=
8258 (Etype (Defining_Identifier (Analyzed_Formal)));
8261 Freeze_Before (Instantiation_Node, Typ);
8263 -- If the actual is an aggregate, perform name resolution on
8264 -- its components (the analysis of an aggregate does not do it)
8265 -- to capture local names that may be hidden if the generic is
8268 if Nkind (Actual) = N_Aggregate then
8269 Pre_Analyze_And_Resolve (Actual, Typ);
8272 if Is_Limited_Type (Typ)
8273 and then not OK_For_Limited_Init (Actual)
8276 ("initialization not allowed for limited types", Actual);
8277 Explain_Limited_Type (Typ, Actual);
8281 elsif Present (Default_Expression (Formal)) then
8283 -- Use default to construct declaration
8285 if Present (Subt_Mark) then
8287 else pragma Assert (Present (Acc_Def));
8292 Make_Object_Declaration (Sloc (Formal),
8293 Defining_Identifier => New_Copy (Formal_Id),
8294 Constant_Present => True,
8295 Object_Definition => New_Copy (Def),
8296 Expression => New_Copy_Tree (Default_Expression
8299 Append (Decl_Node, List);
8300 Set_Analyzed (Expression (Decl_Node), False);
8305 Instantiation_Node, Formal_Id);
8306 Error_Msg_NE ("\in instantiation of & declared#",
8308 Scope (Defining_Identifier (Analyzed_Formal)));
8311 (Etype (Defining_Identifier (Analyzed_Formal)))
8313 -- Create dummy constant declaration so that instance can be
8314 -- analyzed, to minimize cascaded visibility errors.
8316 if Present (Subt_Mark) then
8318 else pragma Assert (Present (Acc_Def));
8323 Make_Object_Declaration (Loc,
8324 Defining_Identifier => New_Copy (Formal_Id),
8325 Constant_Present => True,
8326 Object_Definition => New_Copy (Def),
8328 Make_Attribute_Reference (Sloc (Formal_Id),
8329 Attribute_Name => Name_First,
8330 Prefix => New_Copy (Def)));
8332 Append (Decl_Node, List);
8335 Abandon_Instantiation (Instantiation_Node);
8340 if Nkind (Actual) in N_Has_Entity then
8341 Actual_Decl := Parent (Entity (Actual));
8344 -- Ada 2005 (AI-423): For a formal object declaration with a null
8345 -- exclusion or an access definition that has a null exclusion: If the
8346 -- actual matching the formal object declaration denotes a generic
8347 -- formal object of another generic unit G, and the instantiation
8348 -- containing the actual occurs within the body of G or within the body
8349 -- of a generic unit declared within the declarative region of G, then
8350 -- the declaration of the formal object of G must have a null exclusion.
8351 -- Otherwise, the subtype of the actual matching the formal object
8352 -- declaration shall exclude null.
8354 if Ada_Version >= Ada_05
8355 and then Present (Actual_Decl)
8357 (Nkind (Actual_Decl) = N_Formal_Object_Declaration
8358 or else Nkind (Actual_Decl) = N_Object_Declaration)
8359 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
8360 and then Has_Null_Exclusion (Actual_Decl)
8361 and then not Has_Null_Exclusion (Analyzed_Formal)
8363 Error_Msg_Sloc := Sloc (Actual_Decl);
8365 ("`NOT NULL` required in formal, to match actual #",
8370 end Instantiate_Object;
8372 ------------------------------
8373 -- Instantiate_Package_Body --
8374 ------------------------------
8376 procedure Instantiate_Package_Body
8377 (Body_Info : Pending_Body_Info;
8378 Inlined_Body : Boolean := False;
8379 Body_Optional : Boolean := False)
8381 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8382 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8383 Loc : constant Source_Ptr := Sloc (Inst_Node);
8385 Gen_Id : constant Node_Id := Name (Inst_Node);
8386 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8387 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8388 Act_Spec : constant Node_Id := Specification (Act_Decl);
8389 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
8391 Act_Body_Name : Node_Id;
8393 Gen_Body_Id : Node_Id;
8395 Act_Body_Id : Entity_Id;
8397 Parent_Installed : Boolean := False;
8398 Save_Style_Check : constant Boolean := Style_Check;
8401 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8403 -- The instance body may already have been processed, as the parent of
8404 -- another instance that is inlined (Load_Parent_Of_Generic).
8406 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
8410 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8412 -- Re-establish the state of information on which checks are suppressed.
8413 -- This information was set in Body_Info at the point of instantiation,
8414 -- and now we restore it so that the instance is compiled using the
8415 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8417 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8418 Scope_Suppress := Body_Info.Scope_Suppress;
8420 if No (Gen_Body_Id) then
8421 Load_Parent_Of_Generic
8422 (Inst_Node, Specification (Gen_Decl), Body_Optional);
8423 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8426 -- Establish global variable for sloc adjustment and for error recovery
8428 Instantiation_Node := Inst_Node;
8430 if Present (Gen_Body_Id) then
8431 Save_Env (Gen_Unit, Act_Decl_Id);
8432 Style_Check := False;
8433 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8435 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8437 Create_Instantiation_Source
8438 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
8442 (Original_Node (Gen_Body), Empty, Instantiating => True);
8444 -- Build new name (possibly qualified) for body declaration
8446 Act_Body_Id := New_Copy (Act_Decl_Id);
8448 -- Some attributes of spec entity are not inherited by body entity
8450 Set_Handler_Records (Act_Body_Id, No_List);
8452 if Nkind (Defining_Unit_Name (Act_Spec)) =
8453 N_Defining_Program_Unit_Name
8456 Make_Defining_Program_Unit_Name (Loc,
8457 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
8458 Defining_Identifier => Act_Body_Id);
8460 Act_Body_Name := Act_Body_Id;
8463 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
8465 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
8466 Check_Generic_Actuals (Act_Decl_Id, False);
8468 -- If it is a child unit, make the parent instance (which is an
8469 -- instance of the parent of the generic) visible. The parent
8470 -- instance is the prefix of the name of the generic unit.
8472 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8473 and then Nkind (Gen_Id) = N_Expanded_Name
8475 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8476 Parent_Installed := True;
8478 elsif Is_Child_Unit (Gen_Unit) then
8479 Install_Parent (Scope (Gen_Unit), In_Body => True);
8480 Parent_Installed := True;
8483 -- If the instantiation is a library unit, and this is the main unit,
8484 -- then build the resulting compilation unit nodes for the instance.
8485 -- If this is a compilation unit but it is not the main unit, then it
8486 -- is the body of a unit in the context, that is being compiled
8487 -- because it is encloses some inlined unit or another generic unit
8488 -- being instantiated. In that case, this body is not part of the
8489 -- current compilation, and is not attached to the tree, but its
8490 -- parent must be set for analysis.
8492 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8494 -- Replace instance node with body of instance, and create new
8495 -- node for corresponding instance declaration.
8497 Build_Instance_Compilation_Unit_Nodes
8498 (Inst_Node, Act_Body, Act_Decl);
8499 Analyze (Inst_Node);
8501 if Parent (Inst_Node) = Cunit (Main_Unit) then
8503 -- If the instance is a child unit itself, then set the scope
8504 -- of the expanded body to be the parent of the instantiation
8505 -- (ensuring that the fully qualified name will be generated
8506 -- for the elaboration subprogram).
8508 if Nkind (Defining_Unit_Name (Act_Spec)) =
8509 N_Defining_Program_Unit_Name
8512 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
8516 -- Case where instantiation is not a library unit
8519 -- If this is an early instantiation, i.e. appears textually
8520 -- before the corresponding body and must be elaborated first,
8521 -- indicate that the body instance is to be delayed.
8523 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
8525 -- Now analyze the body. We turn off all checks if this is an
8526 -- internal unit, since there is no reason to have checks on for
8527 -- any predefined run-time library code. All such code is designed
8528 -- to be compiled with checks off.
8530 -- Note that we do NOT apply this criterion to children of GNAT
8531 -- (or on VMS, children of DEC). The latter units must suppress
8532 -- checks explicitly if this is needed.
8534 if Is_Predefined_File_Name
8535 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
8537 Analyze (Act_Body, Suppress => All_Checks);
8543 Inherit_Context (Gen_Body, Inst_Node);
8545 -- Remove the parent instances if they have been placed on the scope
8546 -- stack to compile the body.
8548 if Parent_Installed then
8549 Remove_Parent (In_Body => True);
8552 Restore_Private_Views (Act_Decl_Id);
8554 -- Remove the current unit from visibility if this is an instance
8555 -- that is not elaborated on the fly for inlining purposes.
8557 if not Inlined_Body then
8558 Set_Is_Immediately_Visible (Act_Decl_Id, False);
8562 Style_Check := Save_Style_Check;
8564 -- If we have no body, and the unit requires a body, then complain. This
8565 -- complaint is suppressed if we have detected other errors (since a
8566 -- common reason for missing the body is that it had errors).
8568 elsif Unit_Requires_Body (Gen_Unit)
8569 and then not Body_Optional
8571 if Serious_Errors_Detected = 0 then
8573 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
8575 -- Don't attempt to perform any cleanup actions if some other error
8576 -- was aready detected, since this can cause blowups.
8582 -- Case of package that does not need a body
8585 -- If the instantiation of the declaration is a library unit, rewrite
8586 -- the original package instantiation as a package declaration in the
8587 -- compilation unit node.
8589 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8590 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
8591 Rewrite (Inst_Node, Act_Decl);
8593 -- Generate elaboration entity, in case spec has elaboration code.
8594 -- This cannot be done when the instance is analyzed, because it
8595 -- is not known yet whether the body exists.
8597 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
8598 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
8600 -- If the instantiation is not a library unit, then append the
8601 -- declaration to the list of implicitly generated entities. unless
8602 -- it is already a list member which means that it was already
8605 elsif not Is_List_Member (Act_Decl) then
8606 Mark_Rewrite_Insertion (Act_Decl);
8607 Insert_Before (Inst_Node, Act_Decl);
8611 Expander_Mode_Restore;
8612 end Instantiate_Package_Body;
8614 ---------------------------------
8615 -- Instantiate_Subprogram_Body --
8616 ---------------------------------
8618 procedure Instantiate_Subprogram_Body
8619 (Body_Info : Pending_Body_Info)
8621 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
8622 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
8623 Loc : constant Source_Ptr := Sloc (Inst_Node);
8624 Gen_Id : constant Node_Id := Name (Inst_Node);
8625 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8626 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
8627 Anon_Id : constant Entity_Id :=
8628 Defining_Unit_Name (Specification (Act_Decl));
8629 Pack_Id : constant Entity_Id :=
8630 Defining_Unit_Name (Parent (Act_Decl));
8633 Gen_Body_Id : Node_Id;
8635 Pack_Body : Node_Id;
8636 Prev_Formal : Entity_Id;
8638 Unit_Renaming : Node_Id;
8640 Parent_Installed : Boolean := False;
8641 Save_Style_Check : constant Boolean := Style_Check;
8644 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8646 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
8648 -- Re-establish the state of information on which checks are suppressed.
8649 -- This information was set in Body_Info at the point of instantiation,
8650 -- and now we restore it so that the instance is compiled using the
8651 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8653 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
8654 Scope_Suppress := Body_Info.Scope_Suppress;
8656 if No (Gen_Body_Id) then
8657 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
8658 Gen_Body_Id := Corresponding_Body (Gen_Decl);
8661 Instantiation_Node := Inst_Node;
8663 if Present (Gen_Body_Id) then
8664 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
8666 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
8668 -- Either body is not present, or context is non-expanding, as
8669 -- when compiling a subunit. Mark the instance as completed, and
8670 -- diagnose a missing body when needed.
8673 and then Operating_Mode = Generate_Code
8676 ("missing proper body for instantiation", Gen_Body);
8679 Set_Has_Completion (Anon_Id);
8683 Save_Env (Gen_Unit, Anon_Id);
8684 Style_Check := False;
8685 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
8686 Create_Instantiation_Source
8694 (Original_Node (Gen_Body), Empty, Instantiating => True);
8696 -- Create proper defining name for the body, to correspond to
8697 -- the one in the spec.
8699 Set_Defining_Unit_Name (Specification (Act_Body),
8700 Make_Defining_Identifier
8701 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id)));
8702 Set_Corresponding_Spec (Act_Body, Anon_Id);
8703 Set_Has_Completion (Anon_Id);
8704 Check_Generic_Actuals (Pack_Id, False);
8706 -- Generate a reference to link the visible subprogram instance to
8707 -- the the generic body, which for navigation purposes is the only
8708 -- available source for the instance.
8711 (Related_Instance (Pack_Id),
8712 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
8714 -- If it is a child unit, make the parent instance (which is an
8715 -- instance of the parent of the generic) visible. The parent
8716 -- instance is the prefix of the name of the generic unit.
8718 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
8719 and then Nkind (Gen_Id) = N_Expanded_Name
8721 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
8722 Parent_Installed := True;
8724 elsif Is_Child_Unit (Gen_Unit) then
8725 Install_Parent (Scope (Gen_Unit), In_Body => True);
8726 Parent_Installed := True;
8729 -- Inside its body, a reference to the generic unit is a reference
8730 -- to the instance. The corresponding renaming is the first
8731 -- declaration in the body.
8734 Make_Subprogram_Renaming_Declaration (Loc,
8737 Specification (Original_Node (Gen_Body)),
8739 Instantiating => True),
8740 Name => New_Occurrence_Of (Anon_Id, Loc));
8742 -- If there is a formal subprogram with the same name as the unit
8743 -- itself, do not add this renaming declaration. This is a temporary
8744 -- fix for one ACVC test. ???
8746 Prev_Formal := First_Entity (Pack_Id);
8747 while Present (Prev_Formal) loop
8748 if Chars (Prev_Formal) = Chars (Gen_Unit)
8749 and then Is_Overloadable (Prev_Formal)
8754 Next_Entity (Prev_Formal);
8757 if Present (Prev_Formal) then
8758 Decls := New_List (Act_Body);
8760 Decls := New_List (Unit_Renaming, Act_Body);
8763 -- The subprogram body is placed in the body of a dummy package body,
8764 -- whose spec contains the subprogram declaration as well as the
8765 -- renaming declarations for the generic parameters.
8767 Pack_Body := Make_Package_Body (Loc,
8768 Defining_Unit_Name => New_Copy (Pack_Id),
8769 Declarations => Decls);
8771 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8773 -- If the instantiation is a library unit, then build resulting
8774 -- compilation unit nodes for the instance. The declaration of
8775 -- the enclosing package is the grandparent of the subprogram
8776 -- declaration. First replace the instantiation node as the unit
8777 -- of the corresponding compilation.
8779 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
8780 if Parent (Inst_Node) = Cunit (Main_Unit) then
8781 Set_Unit (Parent (Inst_Node), Inst_Node);
8782 Build_Instance_Compilation_Unit_Nodes
8783 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
8784 Analyze (Inst_Node);
8786 Set_Parent (Pack_Body, Parent (Inst_Node));
8787 Analyze (Pack_Body);
8791 Insert_Before (Inst_Node, Pack_Body);
8792 Mark_Rewrite_Insertion (Pack_Body);
8793 Analyze (Pack_Body);
8795 if Expander_Active then
8796 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
8800 Inherit_Context (Gen_Body, Inst_Node);
8802 Restore_Private_Views (Pack_Id, False);
8804 if Parent_Installed then
8805 Remove_Parent (In_Body => True);
8809 Style_Check := Save_Style_Check;
8811 -- Body not found. Error was emitted already. If there were no previous
8812 -- errors, this may be an instance whose scope is a premature instance.
8813 -- In that case we must insure that the (legal) program does raise
8814 -- program error if executed. We generate a subprogram body for this
8815 -- purpose. See DEC ac30vso.
8817 -- Should not reference proprietary DEC tests in comments ???
8819 elsif Serious_Errors_Detected = 0
8820 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
8822 if Ekind (Anon_Id) = E_Procedure then
8824 Make_Subprogram_Body (Loc,
8826 Make_Procedure_Specification (Loc,
8827 Defining_Unit_Name =>
8828 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8829 Parameter_Specifications =>
8831 (Parameter_Specifications (Parent (Anon_Id)))),
8833 Declarations => Empty_List,
8834 Handled_Statement_Sequence =>
8835 Make_Handled_Sequence_Of_Statements (Loc,
8838 Make_Raise_Program_Error (Loc,
8840 PE_Access_Before_Elaboration))));
8844 Make_Raise_Program_Error (Loc,
8845 Reason => PE_Access_Before_Elaboration);
8847 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
8848 Set_Analyzed (Ret_Expr);
8851 Make_Subprogram_Body (Loc,
8853 Make_Function_Specification (Loc,
8854 Defining_Unit_Name =>
8855 Make_Defining_Identifier (Loc, Chars (Anon_Id)),
8856 Parameter_Specifications =>
8858 (Parameter_Specifications (Parent (Anon_Id))),
8859 Result_Definition =>
8860 New_Occurrence_Of (Etype (Anon_Id), Loc)),
8862 Declarations => Empty_List,
8863 Handled_Statement_Sequence =>
8864 Make_Handled_Sequence_Of_Statements (Loc,
8867 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
8870 Pack_Body := Make_Package_Body (Loc,
8871 Defining_Unit_Name => New_Copy (Pack_Id),
8872 Declarations => New_List (Act_Body));
8874 Insert_After (Inst_Node, Pack_Body);
8875 Set_Corresponding_Spec (Pack_Body, Pack_Id);
8876 Analyze (Pack_Body);
8879 Expander_Mode_Restore;
8880 end Instantiate_Subprogram_Body;
8882 ----------------------
8883 -- Instantiate_Type --
8884 ----------------------
8886 function Instantiate_Type
8889 Analyzed_Formal : Node_Id;
8890 Actual_Decls : List_Id) return List_Id
8892 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
8893 A_Gen_T : constant Entity_Id :=
8894 Defining_Identifier (Analyzed_Formal);
8895 Ancestor : Entity_Id := Empty;
8896 Def : constant Node_Id := Formal_Type_Definition (Formal);
8898 Decl_Node : Node_Id;
8899 Decl_Nodes : List_Id;
8903 procedure Validate_Array_Type_Instance;
8904 procedure Validate_Access_Subprogram_Instance;
8905 procedure Validate_Access_Type_Instance;
8906 procedure Validate_Derived_Type_Instance;
8907 procedure Validate_Derived_Interface_Type_Instance;
8908 procedure Validate_Interface_Type_Instance;
8909 procedure Validate_Private_Type_Instance;
8910 -- These procedures perform validation tests for the named case
8912 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
8913 -- Check that base types are the same and that the subtypes match
8914 -- statically. Used in several of the above.
8916 --------------------
8917 -- Subtypes_Match --
8918 --------------------
8920 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
8921 T : constant Entity_Id := Get_Instance_Of (Gen_T);
8924 return (Base_Type (T) = Base_Type (Act_T)
8925 and then Subtypes_Statically_Match (T, Act_T))
8927 or else (Is_Class_Wide_Type (Gen_T)
8928 and then Is_Class_Wide_Type (Act_T)
8931 (Get_Instance_Of (Root_Type (Gen_T)),
8935 ((Ekind (Gen_T) = E_Anonymous_Access_Subprogram_Type
8936 or else Ekind (Gen_T) = E_Anonymous_Access_Type)
8937 and then Ekind (Act_T) = Ekind (Gen_T)
8939 Subtypes_Statically_Match
8940 (Designated_Type (Gen_T), Designated_Type (Act_T)));
8943 -----------------------------------------
8944 -- Validate_Access_Subprogram_Instance --
8945 -----------------------------------------
8947 procedure Validate_Access_Subprogram_Instance is
8949 if not Is_Access_Type (Act_T)
8950 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
8953 ("expect access type in instantiation of &", Actual, Gen_T);
8954 Abandon_Instantiation (Actual);
8957 Check_Mode_Conformant
8958 (Designated_Type (Act_T),
8959 Designated_Type (A_Gen_T),
8963 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
8964 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
8966 ("protected access type not allowed for formal &",
8970 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
8972 ("expect protected access type for formal &",
8975 end Validate_Access_Subprogram_Instance;
8977 -----------------------------------
8978 -- Validate_Access_Type_Instance --
8979 -----------------------------------
8981 procedure Validate_Access_Type_Instance is
8982 Desig_Type : constant Entity_Id :=
8984 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
8987 if not Is_Access_Type (Act_T) then
8989 ("expect access type in instantiation of &", Actual, Gen_T);
8990 Abandon_Instantiation (Actual);
8993 if Is_Access_Constant (A_Gen_T) then
8994 if not Is_Access_Constant (Act_T) then
8996 ("actual type must be access-to-constant type", Actual);
8997 Abandon_Instantiation (Actual);
9000 if Is_Access_Constant (Act_T) then
9002 ("actual type must be access-to-variable type", Actual);
9003 Abandon_Instantiation (Actual);
9005 elsif Ekind (A_Gen_T) = E_General_Access_Type
9006 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
9008 Error_Msg_N ("actual must be general access type!", Actual);
9009 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
9010 Abandon_Instantiation (Actual);
9014 -- The designated subtypes, that is to say the subtypes introduced
9015 -- by an access type declaration (and not by a subtype declaration)
9018 if not Subtypes_Match
9019 (Desig_Type, Designated_Type (Base_Type (Act_T)))
9022 ("designated type of actual does not match that of formal &",
9024 Abandon_Instantiation (Actual);
9026 elsif Is_Access_Type (Designated_Type (Act_T))
9027 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
9029 Is_Constrained (Designated_Type (Desig_Type))
9032 ("designated type of actual does not match that of formal &",
9034 Abandon_Instantiation (Actual);
9037 -- Ada 2005: null-exclusion indicators of the two types must agree
9039 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
9041 ("non null exclusion of actual and formal & do not match",
9044 end Validate_Access_Type_Instance;
9046 ----------------------------------
9047 -- Validate_Array_Type_Instance --
9048 ----------------------------------
9050 procedure Validate_Array_Type_Instance is
9055 function Formal_Dimensions return Int;
9056 -- Count number of dimensions in array type formal
9058 -----------------------
9059 -- Formal_Dimensions --
9060 -----------------------
9062 function Formal_Dimensions return Int is
9067 if Nkind (Def) = N_Constrained_Array_Definition then
9068 Index := First (Discrete_Subtype_Definitions (Def));
9070 Index := First (Subtype_Marks (Def));
9073 while Present (Index) loop
9079 end Formal_Dimensions;
9081 -- Start of processing for Validate_Array_Type_Instance
9084 if not Is_Array_Type (Act_T) then
9086 ("expect array type in instantiation of &", Actual, Gen_T);
9087 Abandon_Instantiation (Actual);
9089 elsif Nkind (Def) = N_Constrained_Array_Definition then
9090 if not (Is_Constrained (Act_T)) then
9092 ("expect constrained array in instantiation of &",
9094 Abandon_Instantiation (Actual);
9098 if Is_Constrained (Act_T) then
9100 ("expect unconstrained array in instantiation of &",
9102 Abandon_Instantiation (Actual);
9106 if Formal_Dimensions /= Number_Dimensions (Act_T) then
9108 ("dimensions of actual do not match formal &", Actual, Gen_T);
9109 Abandon_Instantiation (Actual);
9112 I1 := First_Index (A_Gen_T);
9113 I2 := First_Index (Act_T);
9114 for J in 1 .. Formal_Dimensions loop
9116 -- If the indices of the actual were given by a subtype_mark,
9117 -- the index was transformed into a range attribute. Retrieve
9118 -- the original type mark for checking.
9120 if Is_Entity_Name (Original_Node (I2)) then
9121 T2 := Entity (Original_Node (I2));
9126 if not Subtypes_Match
9127 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
9130 ("index types of actual do not match those of formal &",
9132 Abandon_Instantiation (Actual);
9139 if not Subtypes_Match (
9140 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
9141 Component_Type (Act_T))
9144 ("component subtype of actual does not match that of formal &",
9146 Abandon_Instantiation (Actual);
9149 if Has_Aliased_Components (A_Gen_T)
9150 and then not Has_Aliased_Components (Act_T)
9153 ("actual must have aliased components to match formal type &",
9157 end Validate_Array_Type_Instance;
9159 -----------------------------------------------
9160 -- Validate_Derived_Interface_Type_Instance --
9161 -----------------------------------------------
9163 procedure Validate_Derived_Interface_Type_Instance is
9164 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
9168 -- First apply interface instance checks
9170 Validate_Interface_Type_Instance;
9172 -- Verify that immediate parent interface is an ancestor of
9176 and then not Interface_Present_In_Ancestor (Act_T, Par)
9179 ("interface actual must include progenitor&", Actual, Par);
9182 -- Now verify that the actual includes all other ancestors of
9185 Elmt := First_Elmt (Abstract_Interfaces (A_Gen_T));
9186 while Present (Elmt) loop
9187 if not Interface_Present_In_Ancestor
9188 (Act_T, Get_Instance_Of (Node (Elmt)))
9191 ("interface actual must include progenitor&",
9192 Actual, Node (Elmt));
9197 end Validate_Derived_Interface_Type_Instance;
9199 ------------------------------------
9200 -- Validate_Derived_Type_Instance --
9201 ------------------------------------
9203 procedure Validate_Derived_Type_Instance is
9204 Actual_Discr : Entity_Id;
9205 Ancestor_Discr : Entity_Id;
9208 -- If the parent type in the generic declaration is itself a previous
9209 -- formal type, then it is local to the generic and absent from the
9210 -- analyzed generic definition. In that case the ancestor is the
9211 -- instance of the formal (which must have been instantiated
9212 -- previously), unless the ancestor is itself a formal derived type.
9213 -- In this latter case (which is the subject of Corrigendum 8652/0038
9214 -- (AI-202) the ancestor of the formals is the ancestor of its
9215 -- parent. Otherwise, the analyzed generic carries the parent type.
9216 -- If the parent type is defined in a previous formal package, then
9217 -- the scope of that formal package is that of the generic type
9218 -- itself, and it has already been mapped into the corresponding type
9219 -- in the actual package.
9221 -- Common case: parent type defined outside of the generic
9223 if Is_Entity_Name (Subtype_Mark (Def))
9224 and then Present (Entity (Subtype_Mark (Def)))
9226 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
9228 -- Check whether parent is defined in a previous formal package
9231 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
9234 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
9236 -- The type may be a local derivation, or a type extension of a
9237 -- previous formal, or of a formal of a parent package.
9239 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
9241 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
9243 -- Check whether the parent is another derived formal type in the
9244 -- same generic unit.
9246 if Etype (A_Gen_T) /= A_Gen_T
9247 and then Is_Generic_Type (Etype (A_Gen_T))
9248 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
9249 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
9251 -- Locate ancestor of parent from the subtype declaration
9252 -- created for the actual.
9258 Decl := First (Actual_Decls);
9259 while Present (Decl) loop
9260 if Nkind (Decl) = N_Subtype_Declaration
9261 and then Chars (Defining_Identifier (Decl)) =
9262 Chars (Etype (A_Gen_T))
9264 Ancestor := Generic_Parent_Type (Decl);
9272 pragma Assert (Present (Ancestor));
9276 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
9280 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
9283 -- Ada 2005 (AI-251)
9285 if Ada_Version >= Ada_05
9286 and then Is_Interface (Ancestor)
9288 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
9290 ("(Ada 2005) expected type implementing & in instantiation",
9294 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
9296 ("expect type derived from & in instantiation",
9297 Actual, First_Subtype (Ancestor));
9298 Abandon_Instantiation (Actual);
9301 -- Ada 2005 (AI-443): Synchronized formal derived type ckecks. Note
9302 -- that the formal type declaration has been rewritten as a private
9305 if Ada_Version >= Ada_05
9306 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
9307 and then Synchronized_Present (Parent (A_Gen_T))
9309 -- The actual must be a synchronized tagged type
9311 if not Is_Tagged_Type (Act_T) then
9313 ("actual of synchronized type must be tagged", Actual);
9314 Abandon_Instantiation (Actual);
9316 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
9317 and then Nkind (Type_Definition (Parent (Act_T))) =
9318 N_Derived_Type_Definition
9319 and then not Synchronized_Present (Type_Definition
9323 ("actual of synchronized type must be synchronized", Actual);
9324 Abandon_Instantiation (Actual);
9328 -- Perform atomic/volatile checks (RM C.6(12))
9330 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
9332 ("cannot have atomic actual type for non-atomic formal type",
9335 elsif Is_Volatile (Act_T)
9336 and then not Is_Volatile (Ancestor)
9337 and then Is_By_Reference_Type (Ancestor)
9340 ("cannot have volatile actual type for non-volatile formal type",
9344 -- It should not be necessary to check for unknown discriminants on
9345 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9346 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9347 -- needs fixing. ???
9349 if not Is_Indefinite_Subtype (A_Gen_T)
9350 and then not Unknown_Discriminants_Present (Formal)
9351 and then Is_Indefinite_Subtype (Act_T)
9354 ("actual subtype must be constrained", Actual);
9355 Abandon_Instantiation (Actual);
9358 if not Unknown_Discriminants_Present (Formal) then
9359 if Is_Constrained (Ancestor) then
9360 if not Is_Constrained (Act_T) then
9362 ("actual subtype must be constrained", Actual);
9363 Abandon_Instantiation (Actual);
9366 -- Ancestor is unconstrained, Check if generic formal and actual
9367 -- agree on constrainedness. The check only applies to array types
9368 -- and discriminated types.
9370 elsif Is_Constrained (Act_T) then
9371 if Ekind (Ancestor) = E_Access_Type
9373 (not Is_Constrained (A_Gen_T)
9374 and then Is_Composite_Type (A_Gen_T))
9377 ("actual subtype must be unconstrained", Actual);
9378 Abandon_Instantiation (Actual);
9381 -- A class-wide type is only allowed if the formal has unknown
9384 elsif Is_Class_Wide_Type (Act_T)
9385 and then not Has_Unknown_Discriminants (Ancestor)
9388 ("actual for & cannot be a class-wide type", Actual, Gen_T);
9389 Abandon_Instantiation (Actual);
9391 -- Otherwise, the formal and actual shall have the same number
9392 -- of discriminants and each discriminant of the actual must
9393 -- correspond to a discriminant of the formal.
9395 elsif Has_Discriminants (Act_T)
9396 and then not Has_Unknown_Discriminants (Act_T)
9397 and then Has_Discriminants (Ancestor)
9399 Actual_Discr := First_Discriminant (Act_T);
9400 Ancestor_Discr := First_Discriminant (Ancestor);
9401 while Present (Actual_Discr)
9402 and then Present (Ancestor_Discr)
9404 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
9405 No (Corresponding_Discriminant (Actual_Discr))
9408 ("discriminant & does not correspond " &
9409 "to ancestor discriminant", Actual, Actual_Discr);
9410 Abandon_Instantiation (Actual);
9413 Next_Discriminant (Actual_Discr);
9414 Next_Discriminant (Ancestor_Discr);
9417 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
9419 ("actual for & must have same number of discriminants",
9421 Abandon_Instantiation (Actual);
9424 -- This case should be caught by the earlier check for for
9425 -- constrainedness, but the check here is added for completeness.
9427 elsif Has_Discriminants (Act_T)
9428 and then not Has_Unknown_Discriminants (Act_T)
9431 ("actual for & must not have discriminants", Actual, Gen_T);
9432 Abandon_Instantiation (Actual);
9434 elsif Has_Discriminants (Ancestor) then
9436 ("actual for & must have known discriminants", Actual, Gen_T);
9437 Abandon_Instantiation (Actual);
9440 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
9442 ("constraint on actual is incompatible with formal", Actual);
9443 Abandon_Instantiation (Actual);
9447 -- If the formal and actual types are abstract, check that there
9448 -- are no abstract primitives of the actual type that correspond to
9449 -- nonabstract primitives of the formal type (second sentence of
9452 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
9453 Check_Abstract_Primitives : declare
9454 Gen_Prims : constant Elist_Id :=
9455 Primitive_Operations (A_Gen_T);
9457 Gen_Subp : Entity_Id;
9458 Anc_Subp : Entity_Id;
9459 Anc_Formal : Entity_Id;
9460 Anc_F_Type : Entity_Id;
9462 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
9464 Act_Subp : Entity_Id;
9465 Act_Formal : Entity_Id;
9466 Act_F_Type : Entity_Id;
9468 Subprograms_Correspond : Boolean;
9470 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
9471 -- Returns true if T2 is derived directly or indirectly from
9472 -- T1, including derivations from interfaces. T1 and T2 are
9473 -- required to be specific tagged base types.
9475 ------------------------
9476 -- Is_Tagged_Ancestor --
9477 ------------------------
9479 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
9481 Interfaces : Elist_Id;
9482 Intfc_Elmt : Elmt_Id;
9485 -- The predicate is satisfied if the types are the same
9490 -- If we've reached the top of the derivation chain then
9491 -- we know that T1 is not an ancestor of T2.
9493 elsif Etype (T2) = T2 then
9496 -- Proceed to check T2's immediate parent
9498 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
9501 -- Finally, check to see if T1 is an ancestor of any of T2's
9505 Interfaces := Abstract_Interfaces (T2);
9507 Intfc_Elmt := First_Elmt (Interfaces);
9508 while Present (Intfc_Elmt) loop
9509 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
9513 Next_Elmt (Intfc_Elmt);
9518 end Is_Tagged_Ancestor;
9520 -- Start of processing for Check_Abstract_Primitives
9523 -- Loop over all of the formal derived type's primitives
9525 Gen_Elmt := First_Elmt (Gen_Prims);
9526 while Present (Gen_Elmt) loop
9527 Gen_Subp := Node (Gen_Elmt);
9529 -- If the primitive of the formal is not abstract, then
9530 -- determine whether there is a corresponding primitive of
9531 -- the actual type that's abstract.
9533 if not Is_Abstract_Subprogram (Gen_Subp) then
9534 Act_Elmt := First_Elmt (Act_Prims);
9535 while Present (Act_Elmt) loop
9536 Act_Subp := Node (Act_Elmt);
9538 -- If we find an abstract primitive of the actual,
9539 -- then we need to test whether it corresponds to the
9540 -- subprogram from which the generic formal primitive
9543 if Is_Abstract_Subprogram (Act_Subp) then
9544 Anc_Subp := Alias (Gen_Subp);
9546 -- Test whether we have a corresponding primitive
9547 -- by comparing names, kinds, formal types, and
9550 if Chars (Anc_Subp) = Chars (Act_Subp)
9551 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
9553 Anc_Formal := First_Formal (Anc_Subp);
9554 Act_Formal := First_Formal (Act_Subp);
9555 while Present (Anc_Formal)
9556 and then Present (Act_Formal)
9558 Anc_F_Type := Etype (Anc_Formal);
9559 Act_F_Type := Etype (Act_Formal);
9561 if Ekind (Anc_F_Type)
9562 = E_Anonymous_Access_Type
9564 Anc_F_Type := Designated_Type (Anc_F_Type);
9566 if Ekind (Act_F_Type)
9567 = E_Anonymous_Access_Type
9570 Designated_Type (Act_F_Type);
9576 Ekind (Act_F_Type) = E_Anonymous_Access_Type
9581 Anc_F_Type := Base_Type (Anc_F_Type);
9582 Act_F_Type := Base_Type (Act_F_Type);
9584 -- If the formal is controlling, then the
9585 -- the type of the actual primitive's formal
9586 -- must be derived directly or indirectly
9587 -- from the type of the ancestor primitive's
9590 if Is_Controlling_Formal (Anc_Formal) then
9591 if not Is_Tagged_Ancestor
9592 (Anc_F_Type, Act_F_Type)
9597 -- Otherwise the types of the formals must
9600 elsif Anc_F_Type /= Act_F_Type then
9604 Next_Entity (Anc_Formal);
9605 Next_Entity (Act_Formal);
9608 -- If we traversed through all of the formals
9609 -- then so far the subprograms correspond, so
9610 -- now check that any result types correspond.
9613 and then No (Act_Formal)
9615 Subprograms_Correspond := True;
9617 if Ekind (Act_Subp) = E_Function then
9618 Anc_F_Type := Etype (Anc_Subp);
9619 Act_F_Type := Etype (Act_Subp);
9621 if Ekind (Anc_F_Type)
9622 = E_Anonymous_Access_Type
9625 Designated_Type (Anc_F_Type);
9627 if Ekind (Act_F_Type)
9628 = E_Anonymous_Access_Type
9631 Designated_Type (Act_F_Type);
9633 Subprograms_Correspond := False;
9638 = E_Anonymous_Access_Type
9640 Subprograms_Correspond := False;
9643 Anc_F_Type := Base_Type (Anc_F_Type);
9644 Act_F_Type := Base_Type (Act_F_Type);
9646 -- Now either the result types must be
9647 -- the same or, if the result type is
9648 -- controlling, the result type of the
9649 -- actual primitive must descend from the
9650 -- result type of the ancestor primitive.
9652 if Subprograms_Correspond
9653 and then Anc_F_Type /= Act_F_Type
9655 Has_Controlling_Result (Anc_Subp)
9657 not Is_Tagged_Ancestor
9658 (Anc_F_Type, Act_F_Type)
9660 Subprograms_Correspond := False;
9664 -- Found a matching subprogram belonging to
9665 -- formal ancestor type, so actual subprogram
9666 -- corresponds and this violates 3.9.3(9).
9668 if Subprograms_Correspond then
9670 ("abstract subprogram & overrides " &
9671 "nonabstract subprogram of ancestor",
9679 Next_Elmt (Act_Elmt);
9683 Next_Elmt (Gen_Elmt);
9685 end Check_Abstract_Primitives;
9687 end Validate_Derived_Type_Instance;
9689 --------------------------------------
9690 -- Validate_Interface_Type_Instance --
9691 --------------------------------------
9693 procedure Validate_Interface_Type_Instance is
9695 if not Is_Interface (Act_T) then
9697 ("actual for formal interface type must be an interface",
9700 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
9702 Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
9704 Is_Protected_Interface (A_Gen_T) /=
9705 Is_Protected_Interface (Act_T)
9707 Is_Synchronized_Interface (A_Gen_T) /=
9708 Is_Synchronized_Interface (Act_T)
9711 ("actual for interface& does not match (RM 12.5.5(4))",
9714 end Validate_Interface_Type_Instance;
9716 ------------------------------------
9717 -- Validate_Private_Type_Instance --
9718 ------------------------------------
9720 procedure Validate_Private_Type_Instance is
9721 Formal_Discr : Entity_Id;
9722 Actual_Discr : Entity_Id;
9723 Formal_Subt : Entity_Id;
9726 if Is_Limited_Type (Act_T)
9727 and then not Is_Limited_Type (A_Gen_T)
9730 ("actual for non-limited & cannot be a limited type", Actual,
9732 Explain_Limited_Type (Act_T, Actual);
9733 Abandon_Instantiation (Actual);
9735 elsif Known_To_Have_Preelab_Init (A_Gen_T)
9736 and then not Has_Preelaborable_Initialization (Act_T)
9739 ("actual for & must have preelaborable initialization", Actual,
9742 elsif Is_Indefinite_Subtype (Act_T)
9743 and then not Is_Indefinite_Subtype (A_Gen_T)
9744 and then Ada_Version >= Ada_95
9747 ("actual for & must be a definite subtype", Actual, Gen_T);
9749 elsif not Is_Tagged_Type (Act_T)
9750 and then Is_Tagged_Type (A_Gen_T)
9753 ("actual for & must be a tagged type", Actual, Gen_T);
9755 elsif Has_Discriminants (A_Gen_T) then
9756 if not Has_Discriminants (Act_T) then
9758 ("actual for & must have discriminants", Actual, Gen_T);
9759 Abandon_Instantiation (Actual);
9761 elsif Is_Constrained (Act_T) then
9763 ("actual for & must be unconstrained", Actual, Gen_T);
9764 Abandon_Instantiation (Actual);
9767 Formal_Discr := First_Discriminant (A_Gen_T);
9768 Actual_Discr := First_Discriminant (Act_T);
9769 while Formal_Discr /= Empty loop
9770 if Actual_Discr = Empty then
9772 ("discriminants on actual do not match formal",
9774 Abandon_Instantiation (Actual);
9777 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
9779 -- Access discriminants match if designated types do
9781 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
9782 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
9783 E_Anonymous_Access_Type
9786 (Designated_Type (Base_Type (Formal_Subt))) =
9787 Designated_Type (Base_Type (Etype (Actual_Discr)))
9791 elsif Base_Type (Formal_Subt) /=
9792 Base_Type (Etype (Actual_Discr))
9795 ("types of actual discriminants must match formal",
9797 Abandon_Instantiation (Actual);
9799 elsif not Subtypes_Statically_Match
9800 (Formal_Subt, Etype (Actual_Discr))
9801 and then Ada_Version >= Ada_95
9804 ("subtypes of actual discriminants must match formal",
9806 Abandon_Instantiation (Actual);
9809 Next_Discriminant (Formal_Discr);
9810 Next_Discriminant (Actual_Discr);
9813 if Actual_Discr /= Empty then
9815 ("discriminants on actual do not match formal",
9817 Abandon_Instantiation (Actual);
9824 end Validate_Private_Type_Instance;
9826 -- Start of processing for Instantiate_Type
9829 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
9830 Error_Msg_N ("duplicate instantiation of generic type", Actual);
9831 return New_List (Error);
9833 elsif not Is_Entity_Name (Actual)
9834 or else not Is_Type (Entity (Actual))
9837 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
9838 Abandon_Instantiation (Actual);
9841 Act_T := Entity (Actual);
9843 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
9844 -- as a generic actual parameter if the corresponding formal type
9845 -- does not have a known_discriminant_part, or is a formal derived
9846 -- type that is an Unchecked_Union type.
9848 if Is_Unchecked_Union (Base_Type (Act_T)) then
9849 if not Has_Discriminants (A_Gen_T)
9851 (Is_Derived_Type (A_Gen_T)
9853 Is_Unchecked_Union (A_Gen_T))
9857 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
9858 " discriminated formal type", Act_T);
9863 -- Deal with fixed/floating restrictions
9865 if Is_Floating_Point_Type (Act_T) then
9866 Check_Restriction (No_Floating_Point, Actual);
9867 elsif Is_Fixed_Point_Type (Act_T) then
9868 Check_Restriction (No_Fixed_Point, Actual);
9871 -- Deal with error of using incomplete type as generic actual
9873 if Ekind (Act_T) = E_Incomplete_Type
9874 or else (Is_Class_Wide_Type (Act_T)
9876 Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
9878 if Is_Class_Wide_Type (Act_T)
9879 or else No (Underlying_Type (Act_T))
9881 Error_Msg_N ("premature use of incomplete type", Actual);
9882 Abandon_Instantiation (Actual);
9884 Act_T := Full_View (Act_T);
9885 Set_Entity (Actual, Act_T);
9887 if Has_Private_Component (Act_T) then
9889 ("premature use of type with private component", Actual);
9893 -- Deal with error of premature use of private type as generic actual
9895 elsif Is_Private_Type (Act_T)
9896 and then Is_Private_Type (Base_Type (Act_T))
9897 and then not Is_Generic_Type (Act_T)
9898 and then not Is_Derived_Type (Act_T)
9899 and then No (Full_View (Root_Type (Act_T)))
9901 Error_Msg_N ("premature use of private type", Actual);
9903 elsif Has_Private_Component (Act_T) then
9905 ("premature use of type with private component", Actual);
9908 Set_Instance_Of (A_Gen_T, Act_T);
9910 -- If the type is generic, the class-wide type may also be used
9912 if Is_Tagged_Type (A_Gen_T)
9913 and then Is_Tagged_Type (Act_T)
9914 and then not Is_Class_Wide_Type (A_Gen_T)
9916 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
9917 Class_Wide_Type (Act_T));
9920 if not Is_Abstract_Type (A_Gen_T)
9921 and then Is_Abstract_Type (Act_T)
9924 ("actual of non-abstract formal cannot be abstract", Actual);
9927 -- A generic scalar type is a first subtype for which we generate
9928 -- an anonymous base type. Indicate that the instance of this base
9929 -- is the base type of the actual.
9931 if Is_Scalar_Type (A_Gen_T) then
9932 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
9936 if Error_Posted (Act_T) then
9940 when N_Formal_Private_Type_Definition =>
9941 Validate_Private_Type_Instance;
9943 when N_Formal_Derived_Type_Definition =>
9944 Validate_Derived_Type_Instance;
9946 when N_Formal_Discrete_Type_Definition =>
9947 if not Is_Discrete_Type (Act_T) then
9949 ("expect discrete type in instantiation of&",
9951 Abandon_Instantiation (Actual);
9954 when N_Formal_Signed_Integer_Type_Definition =>
9955 if not Is_Signed_Integer_Type (Act_T) then
9957 ("expect signed integer type in instantiation of&",
9959 Abandon_Instantiation (Actual);
9962 when N_Formal_Modular_Type_Definition =>
9963 if not Is_Modular_Integer_Type (Act_T) then
9965 ("expect modular type in instantiation of &",
9967 Abandon_Instantiation (Actual);
9970 when N_Formal_Floating_Point_Definition =>
9971 if not Is_Floating_Point_Type (Act_T) then
9973 ("expect float type in instantiation of &", Actual, Gen_T);
9974 Abandon_Instantiation (Actual);
9977 when N_Formal_Ordinary_Fixed_Point_Definition =>
9978 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
9980 ("expect ordinary fixed point type in instantiation of &",
9982 Abandon_Instantiation (Actual);
9985 when N_Formal_Decimal_Fixed_Point_Definition =>
9986 if not Is_Decimal_Fixed_Point_Type (Act_T) then
9988 ("expect decimal type in instantiation of &",
9990 Abandon_Instantiation (Actual);
9993 when N_Array_Type_Definition =>
9994 Validate_Array_Type_Instance;
9996 when N_Access_To_Object_Definition =>
9997 Validate_Access_Type_Instance;
9999 when N_Access_Function_Definition |
10000 N_Access_Procedure_Definition =>
10001 Validate_Access_Subprogram_Instance;
10003 when N_Record_Definition =>
10004 Validate_Interface_Type_Instance;
10006 when N_Derived_Type_Definition =>
10007 Validate_Derived_Interface_Type_Instance;
10010 raise Program_Error;
10015 Subt := New_Copy (Gen_T);
10017 -- Use adjusted sloc of subtype name as the location for other nodes in
10018 -- the subtype declaration.
10020 Loc := Sloc (Subt);
10023 Make_Subtype_Declaration (Loc,
10024 Defining_Identifier => Subt,
10025 Subtype_Indication => New_Reference_To (Act_T, Loc));
10027 if Is_Private_Type (Act_T) then
10028 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10030 elsif Is_Access_Type (Act_T)
10031 and then Is_Private_Type (Designated_Type (Act_T))
10033 Set_Has_Private_View (Subtype_Indication (Decl_Node));
10036 Decl_Nodes := New_List (Decl_Node);
10038 -- Flag actual derived types so their elaboration produces the
10039 -- appropriate renamings for the primitive operations of the ancestor.
10040 -- Flag actual for formal private types as well, to determine whether
10041 -- operations in the private part may override inherited operations.
10042 -- If the formal has an interface list, the ancestor is not the
10043 -- parent, but the analyzed formal that includes the interface
10044 -- operations of all its progenitors.
10046 if Nkind (Def) = N_Formal_Derived_Type_Definition then
10047 if Present (Interface_List (Def)) then
10048 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
10050 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10053 elsif Nkind (Def) = N_Formal_Private_Type_Definition then
10054 Set_Generic_Parent_Type (Decl_Node, Ancestor);
10057 -- If the actual is a synchronized type that implements an interface,
10058 -- the primitive operations are attached to the corresponding record,
10059 -- and we have to treat it as an additional generic actual, so that its
10060 -- primitive operations become visible in the instance. The task or
10061 -- protected type itself does not carry primitive operations.
10063 if Is_Concurrent_Type (Act_T)
10064 and then Is_Tagged_Type (Act_T)
10065 and then Present (Corresponding_Record_Type (Act_T))
10066 and then Present (Ancestor)
10067 and then Is_Interface (Ancestor)
10070 Corr_Rec : constant Entity_Id :=
10071 Corresponding_Record_Type (Act_T);
10072 New_Corr : Entity_Id;
10073 Corr_Decl : Node_Id;
10076 New_Corr := Make_Defining_Identifier (Loc,
10077 Chars => New_Internal_Name ('S'));
10079 Make_Subtype_Declaration (Loc,
10080 Defining_Identifier => New_Corr,
10081 Subtype_Indication =>
10082 New_Reference_To (Corr_Rec, Loc));
10083 Append_To (Decl_Nodes, Corr_Decl);
10085 if Ekind (Act_T) = E_Task_Type then
10086 Set_Ekind (Subt, E_Task_Subtype);
10088 Set_Ekind (Subt, E_Protected_Subtype);
10091 Set_Corresponding_Record_Type (Subt, Corr_Rec);
10092 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
10093 Set_Generic_Parent_Type (Decl_Node, Empty);
10098 end Instantiate_Type;
10100 -----------------------
10101 -- Is_Generic_Formal --
10102 -----------------------
10104 function Is_Generic_Formal (E : Entity_Id) return Boolean is
10110 Kind := Nkind (Parent (E));
10112 Kind = N_Formal_Object_Declaration
10113 or else Kind = N_Formal_Package_Declaration
10114 or else Kind = N_Formal_Type_Declaration
10116 (Is_Formal_Subprogram (E)
10118 Nkind (Parent (Parent (E))) in
10119 N_Formal_Subprogram_Declaration);
10121 end Is_Generic_Formal;
10123 ---------------------
10124 -- Is_In_Main_Unit --
10125 ---------------------
10127 function Is_In_Main_Unit (N : Node_Id) return Boolean is
10128 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
10129 Current_Unit : Node_Id;
10132 if Unum = Main_Unit then
10135 -- If the current unit is a subunit then it is either the main unit or
10136 -- is being compiled as part of the main unit.
10138 elsif Nkind (N) = N_Compilation_Unit then
10139 return Nkind (Unit (N)) = N_Subunit;
10142 Current_Unit := Parent (N);
10143 while Present (Current_Unit)
10144 and then Nkind (Current_Unit) /= N_Compilation_Unit
10146 Current_Unit := Parent (Current_Unit);
10149 -- The instantiation node is in the main unit, or else the current node
10150 -- (perhaps as the result of nested instantiations) is in the main unit,
10151 -- or in the declaration of the main unit, which in this last case must
10154 return Unum = Main_Unit
10155 or else Current_Unit = Cunit (Main_Unit)
10156 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
10157 or else (Present (Library_Unit (Current_Unit))
10158 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
10159 end Is_In_Main_Unit;
10161 ----------------------------
10162 -- Load_Parent_Of_Generic --
10163 ----------------------------
10165 procedure Load_Parent_Of_Generic
10168 Body_Optional : Boolean := False)
10170 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
10171 Save_Style_Check : constant Boolean := Style_Check;
10172 True_Parent : Node_Id;
10173 Inst_Node : Node_Id;
10175 Previous_Instances : constant Elist_Id := New_Elmt_List;
10177 procedure Collect_Previous_Instances (Decls : List_Id);
10178 -- Collect all instantiations in the given list of declarations,
10179 -- that precedes the generic that we need to load. If the bodies
10180 -- of these instantiations are available, we must analyze them,
10181 -- to ensure that the public symbols generated are the same when
10182 -- the unit is compiled to generate code, and when it is compiled
10183 -- in the context of the unit that needs a particular nested instance.
10185 --------------------------------
10186 -- Collect_Previous_Instances --
10187 --------------------------------
10189 procedure Collect_Previous_Instances (Decls : List_Id) is
10193 Decl := First (Decls);
10194 while Present (Decl) loop
10195 if Sloc (Decl) >= Sloc (Inst_Node) then
10198 elsif Nkind (Decl) = N_Package_Instantiation then
10199 Append_Elmt (Decl, Previous_Instances);
10201 elsif Nkind (Decl) = N_Package_Declaration then
10202 Collect_Previous_Instances
10203 (Visible_Declarations (Specification (Decl)));
10204 Collect_Previous_Instances
10205 (Private_Declarations (Specification (Decl)));
10207 elsif Nkind (Decl) = N_Package_Body then
10208 Collect_Previous_Instances (Declarations (Decl));
10213 end Collect_Previous_Instances;
10215 -- Start of processing for Load_Parent_Of_Generic
10218 if not In_Same_Source_Unit (N, Spec)
10219 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
10220 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
10221 and then not Is_In_Main_Unit (Spec))
10223 -- Find body of parent of spec, and analyze it. A special case arises
10224 -- when the parent is an instantiation, that is to say when we are
10225 -- currently instantiating a nested generic. In that case, there is
10226 -- no separate file for the body of the enclosing instance. Instead,
10227 -- the enclosing body must be instantiated as if it were a pending
10228 -- instantiation, in order to produce the body for the nested generic
10229 -- we require now. Note that in that case the generic may be defined
10230 -- in a package body, the instance defined in the same package body,
10231 -- and the original enclosing body may not be in the main unit.
10233 Inst_Node := Empty;
10235 True_Parent := Parent (Spec);
10236 while Present (True_Parent)
10237 and then Nkind (True_Parent) /= N_Compilation_Unit
10239 if Nkind (True_Parent) = N_Package_Declaration
10241 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
10243 -- Parent is a compilation unit that is an instantiation.
10244 -- Instantiation node has been replaced with package decl.
10246 Inst_Node := Original_Node (True_Parent);
10249 elsif Nkind (True_Parent) = N_Package_Declaration
10250 and then Present (Generic_Parent (Specification (True_Parent)))
10251 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10253 -- Parent is an instantiation within another specification.
10254 -- Declaration for instance has been inserted before original
10255 -- instantiation node. A direct link would be preferable?
10257 Inst_Node := Next (True_Parent);
10258 while Present (Inst_Node)
10259 and then Nkind (Inst_Node) /= N_Package_Instantiation
10264 -- If the instance appears within a generic, and the generic
10265 -- unit is defined within a formal package of the enclosing
10266 -- generic, there is no generic body available, and none
10267 -- needed. A more precise test should be used ???
10269 if No (Inst_Node) then
10276 True_Parent := Parent (True_Parent);
10280 -- Case where we are currently instantiating a nested generic
10282 if Present (Inst_Node) then
10283 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
10285 -- Instantiation node and declaration of instantiated package
10286 -- were exchanged when only the declaration was needed.
10287 -- Restore instantiation node before proceeding with body.
10289 Set_Unit (Parent (True_Parent), Inst_Node);
10292 -- Now complete instantiation of enclosing body, if it appears
10293 -- in some other unit. If it appears in the current unit, the
10294 -- body will have been instantiated already.
10296 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
10298 -- We need to determine the expander mode to instantiate the
10299 -- enclosing body. Because the generic body we need may use
10300 -- global entities declared in the enclosing package (including
10301 -- aggregates) it is in general necessary to compile this body
10302 -- with expansion enabled. The exception is if we are within a
10303 -- generic package, in which case the usual generic rule
10307 Exp_Status : Boolean := True;
10311 -- Loop through scopes looking for generic package
10313 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
10314 while Present (Scop)
10315 and then Scop /= Standard_Standard
10317 if Ekind (Scop) = E_Generic_Package then
10318 Exp_Status := False;
10322 Scop := Scope (Scop);
10325 -- Collect previous instantiations in the unit that
10326 -- contains the desired generic,
10328 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
10329 and then not Body_Optional
10336 Par := Parent (Inst_Node);
10337 while Present (Par) loop
10338 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
10339 Par := Parent (Par);
10342 pragma Assert (Present (Par));
10344 if Nkind (Par) = N_Package_Body then
10345 Collect_Previous_Instances (Declarations (Par));
10347 elsif Nkind (Par) = N_Package_Declaration then
10348 Collect_Previous_Instances
10349 (Visible_Declarations (Specification (Par)));
10350 Collect_Previous_Instances
10351 (Private_Declarations (Specification (Par)));
10354 -- Enclosing unit is a subprogram body, In this
10355 -- case all instance bodies are processed in order
10356 -- and there is no need to collect them separately.
10361 Decl := First_Elmt (Previous_Instances);
10362 while Present (Decl) loop
10363 Instantiate_Package_Body
10365 ((Inst_Node => Node (Decl),
10367 Instance_Spec (Node (Decl)),
10368 Expander_Status => Exp_Status,
10369 Current_Sem_Unit =>
10370 Get_Code_Unit (Sloc (Node (Decl))),
10371 Scope_Suppress => Scope_Suppress,
10372 Local_Suppress_Stack_Top =>
10373 Local_Suppress_Stack_Top)),
10374 Body_Optional => True);
10381 Instantiate_Package_Body
10383 ((Inst_Node => Inst_Node,
10384 Act_Decl => True_Parent,
10385 Expander_Status => Exp_Status,
10386 Current_Sem_Unit =>
10387 Get_Code_Unit (Sloc (Inst_Node)),
10388 Scope_Suppress => Scope_Suppress,
10389 Local_Suppress_Stack_Top =>
10390 Local_Suppress_Stack_Top)),
10391 Body_Optional => Body_Optional);
10395 -- Case where we are not instantiating a nested generic
10398 Opt.Style_Check := False;
10399 Expander_Mode_Save_And_Set (True);
10400 Load_Needed_Body (Comp_Unit, OK);
10401 Opt.Style_Check := Save_Style_Check;
10402 Expander_Mode_Restore;
10405 and then Unit_Requires_Body (Defining_Entity (Spec))
10406 and then not Body_Optional
10409 Bname : constant Unit_Name_Type :=
10410 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
10413 Error_Msg_Unit_1 := Bname;
10414 Error_Msg_N ("this instantiation requires$!", N);
10415 Error_Msg_File_1 := Get_File_Name (Bname, Subunit => False);
10416 Error_Msg_N ("\but file{ was not found!", N);
10417 raise Unrecoverable_Error;
10423 -- If loading parent of the generic caused an instantiation circularity,
10424 -- we abandon compilation at this point, because otherwise in some cases
10425 -- we get into trouble with infinite recursions after this point.
10427 if Circularity_Detected then
10428 raise Unrecoverable_Error;
10430 end Load_Parent_Of_Generic;
10432 -----------------------
10433 -- Move_Freeze_Nodes --
10434 -----------------------
10436 procedure Move_Freeze_Nodes
10437 (Out_Of : Entity_Id;
10442 Next_Decl : Node_Id;
10443 Next_Node : Node_Id := After;
10446 function Is_Outer_Type (T : Entity_Id) return Boolean;
10447 -- Check whether entity is declared in a scope external to that
10448 -- of the generic unit.
10450 -------------------
10451 -- Is_Outer_Type --
10452 -------------------
10454 function Is_Outer_Type (T : Entity_Id) return Boolean is
10455 Scop : Entity_Id := Scope (T);
10458 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
10462 while Scop /= Standard_Standard loop
10463 if Scop = Out_Of then
10466 Scop := Scope (Scop);
10474 -- Start of processing for Move_Freeze_Nodes
10481 -- First remove the freeze nodes that may appear before all other
10485 while Present (Decl)
10486 and then Nkind (Decl) = N_Freeze_Entity
10487 and then Is_Outer_Type (Entity (Decl))
10489 Decl := Remove_Head (L);
10490 Insert_After (Next_Node, Decl);
10491 Set_Analyzed (Decl, False);
10496 -- Next scan the list of declarations and remove each freeze node that
10497 -- appears ahead of the current node.
10499 while Present (Decl) loop
10500 while Present (Next (Decl))
10501 and then Nkind (Next (Decl)) = N_Freeze_Entity
10502 and then Is_Outer_Type (Entity (Next (Decl)))
10504 Next_Decl := Remove_Next (Decl);
10505 Insert_After (Next_Node, Next_Decl);
10506 Set_Analyzed (Next_Decl, False);
10507 Next_Node := Next_Decl;
10510 -- If the declaration is a nested package or concurrent type, then
10511 -- recurse. Nested generic packages will have been processed from the
10514 if Nkind (Decl) = N_Package_Declaration then
10515 Spec := Specification (Decl);
10517 elsif Nkind (Decl) = N_Task_Type_Declaration then
10518 Spec := Task_Definition (Decl);
10520 elsif Nkind (Decl) = N_Protected_Type_Declaration then
10521 Spec := Protected_Definition (Decl);
10527 if Present (Spec) then
10528 Move_Freeze_Nodes (Out_Of, Next_Node,
10529 Visible_Declarations (Spec));
10530 Move_Freeze_Nodes (Out_Of, Next_Node,
10531 Private_Declarations (Spec));
10536 end Move_Freeze_Nodes;
10542 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
10544 return Generic_Renamings.Table (E).Next_In_HTable;
10547 ------------------------
10548 -- Preanalyze_Actuals --
10549 ------------------------
10551 procedure Pre_Analyze_Actuals (N : Node_Id) is
10554 Errs : constant Int := Serious_Errors_Detected;
10557 Assoc := First (Generic_Associations (N));
10558 while Present (Assoc) loop
10559 if Nkind (Assoc) /= N_Others_Choice then
10560 Act := Explicit_Generic_Actual_Parameter (Assoc);
10562 -- Within a nested instantiation, a defaulted actual is an empty
10563 -- association, so nothing to analyze. If the subprogram actual
10564 -- isan attribute, analyze prefix only, because actual is not a
10565 -- complete attribute reference.
10567 -- If actual is an allocator, analyze expression only. The full
10568 -- analysis can generate code, and if instance is a compilation
10569 -- unit we have to wait until the package instance is installed
10570 -- to have a proper place to insert this code.
10572 -- String literals may be operators, but at this point we do not
10573 -- know whether the actual is a formal subprogram or a string.
10578 elsif Nkind (Act) = N_Attribute_Reference then
10579 Analyze (Prefix (Act));
10581 elsif Nkind (Act) = N_Explicit_Dereference then
10582 Analyze (Prefix (Act));
10584 elsif Nkind (Act) = N_Allocator then
10586 Expr : constant Node_Id := Expression (Act);
10589 if Nkind (Expr) = N_Subtype_Indication then
10590 Analyze (Subtype_Mark (Expr));
10592 -- Analyze separately each discriminant constraint,
10593 -- when given with a named association.
10599 Constr := First (Constraints (Constraint (Expr)));
10600 while Present (Constr) loop
10601 if Nkind (Constr) = N_Discriminant_Association then
10602 Analyze (Expression (Constr));
10616 elsif Nkind (Act) /= N_Operator_Symbol then
10620 if Errs /= Serious_Errors_Detected then
10621 Abandon_Instantiation (Act);
10627 end Pre_Analyze_Actuals;
10629 -------------------
10630 -- Remove_Parent --
10631 -------------------
10633 procedure Remove_Parent (In_Body : Boolean := False) is
10634 S : Entity_Id := Current_Scope;
10640 -- After child instantiation is complete, remove from scope stack the
10641 -- extra copy of the current scope, and then remove parent instances.
10643 if not In_Body then
10646 while Current_Scope /= S loop
10647 P := Current_Scope;
10648 End_Package_Scope (Current_Scope);
10650 if In_Open_Scopes (P) then
10651 E := First_Entity (P);
10653 while Present (E) loop
10654 Set_Is_Immediately_Visible (E, True);
10658 if Is_Generic_Instance (Current_Scope)
10659 and then P /= Current_Scope
10661 -- We are within an instance of some sibling. Retain
10662 -- visibility of parent, for proper subsequent cleanup,
10663 -- and reinstall private declarations as well.
10665 Set_In_Private_Part (P);
10666 Install_Private_Declarations (P);
10669 -- If the ultimate parent is a top-level unit recorded in
10670 -- Instance_Parent_Unit, then reset its visibility to what
10671 -- it was before instantiation. (It's not clear what the
10672 -- purpose is of testing whether Scope (P) is In_Open_Scopes,
10673 -- but that test was present before the ultimate parent test
10676 elsif not In_Open_Scopes (Scope (P))
10677 or else (P = Instance_Parent_Unit
10678 and then not Parent_Unit_Visible)
10680 Set_Is_Immediately_Visible (P, False);
10684 -- Reset visibility of entities in the enclosing scope
10686 Set_Is_Hidden_Open_Scope (Current_Scope, False);
10687 Hidden := First_Elmt (Hidden_Entities);
10689 while Present (Hidden) loop
10690 Set_Is_Immediately_Visible (Node (Hidden), True);
10691 Next_Elmt (Hidden);
10695 -- Each body is analyzed separately, and there is no context
10696 -- that needs preserving from one body instance to the next,
10697 -- so remove all parent scopes that have been installed.
10699 while Present (S) loop
10700 End_Package_Scope (S);
10701 Set_Is_Immediately_Visible (S, False);
10702 S := Current_Scope;
10703 exit when S = Standard_Standard;
10712 procedure Restore_Env is
10713 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
10716 if No (Current_Instantiated_Parent.Act_Id) then
10718 -- Restore environment after subprogram inlining
10720 Restore_Private_Views (Empty);
10723 Current_Instantiated_Parent := Saved.Instantiated_Parent;
10724 Exchanged_Views := Saved.Exchanged_Views;
10725 Hidden_Entities := Saved.Hidden_Entities;
10726 Current_Sem_Unit := Saved.Current_Sem_Unit;
10727 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
10728 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
10730 Restore_Opt_Config_Switches (Saved.Switches);
10732 Instance_Envs.Decrement_Last;
10735 ---------------------------
10736 -- Restore_Private_Views --
10737 ---------------------------
10739 procedure Restore_Private_Views
10740 (Pack_Id : Entity_Id;
10741 Is_Package : Boolean := True)
10746 Dep_Elmt : Elmt_Id;
10749 procedure Restore_Nested_Formal (Formal : Entity_Id);
10750 -- Hide the generic formals of formal packages declared with box
10751 -- which were reachable in the current instantiation.
10753 ---------------------------
10754 -- Restore_Nested_Formal --
10755 ---------------------------
10757 procedure Restore_Nested_Formal (Formal : Entity_Id) is
10761 if Present (Renamed_Object (Formal))
10762 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
10766 elsif Present (Associated_Formal_Package (Formal)) then
10768 Ent := First_Entity (Formal);
10769 while Present (Ent) loop
10770 exit when Ekind (Ent) = E_Package
10771 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
10773 Set_Is_Hidden (Ent);
10774 Set_Is_Potentially_Use_Visible (Ent, False);
10776 -- If package, then recurse
10778 if Ekind (Ent) = E_Package then
10779 Restore_Nested_Formal (Ent);
10785 end Restore_Nested_Formal;
10787 -- Start of processing for Restore_Private_Views
10790 M := First_Elmt (Exchanged_Views);
10791 while Present (M) loop
10794 -- Subtypes of types whose views have been exchanged, and that
10795 -- are defined within the instance, were not on the list of
10796 -- Private_Dependents on entry to the instance, so they have to
10797 -- be exchanged explicitly now, in order to remain consistent with
10798 -- the view of the parent type.
10800 if Ekind (Typ) = E_Private_Type
10801 or else Ekind (Typ) = E_Limited_Private_Type
10802 or else Ekind (Typ) = E_Record_Type_With_Private
10804 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
10805 while Present (Dep_Elmt) loop
10806 Dep_Typ := Node (Dep_Elmt);
10808 if Scope (Dep_Typ) = Pack_Id
10809 and then Present (Full_View (Dep_Typ))
10811 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
10812 Exchange_Declarations (Dep_Typ);
10815 Next_Elmt (Dep_Elmt);
10819 Exchange_Declarations (Node (M));
10823 if No (Pack_Id) then
10827 -- Make the generic formal parameters private, and make the formal
10828 -- types into subtypes of the actuals again.
10830 E := First_Entity (Pack_Id);
10831 while Present (E) loop
10832 Set_Is_Hidden (E, True);
10835 and then Nkind (Parent (E)) = N_Subtype_Declaration
10837 Set_Is_Generic_Actual_Type (E, False);
10839 -- An unusual case of aliasing: the actual may also be directly
10840 -- visible in the generic, and be private there, while it is fully
10841 -- visible in the context of the instance. The internal subtype is
10842 -- private in the instance, but has full visibility like its
10843 -- parent in the enclosing scope. This enforces the invariant that
10844 -- the privacy status of all private dependents of a type coincide
10845 -- with that of the parent type. This can only happen when a
10846 -- generic child unit is instantiated within sibling.
10848 if Is_Private_Type (E)
10849 and then not Is_Private_Type (Etype (E))
10851 Exchange_Declarations (E);
10854 elsif Ekind (E) = E_Package then
10856 -- The end of the renaming list is the renaming of the generic
10857 -- package itself. If the instance is a subprogram, all entities
10858 -- in the corresponding package are renamings. If this entity is
10859 -- a formal package, make its own formals private as well. The
10860 -- actual in this case is itself the renaming of an instantation.
10861 -- If the entity is not a package renaming, it is the entity
10862 -- created to validate formal package actuals: ignore.
10864 -- If the actual is itself a formal package for the enclosing
10865 -- generic, or the actual for such a formal package, it remains
10866 -- visible on exit from the instance, and therefore nothing
10867 -- needs to be done either, except to keep it accessible.
10870 and then Renamed_Object (E) = Pack_Id
10874 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
10877 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
10878 Set_Is_Hidden (E, False);
10882 Act_P : constant Entity_Id := Renamed_Object (E);
10886 Id := First_Entity (Act_P);
10888 and then Id /= First_Private_Entity (Act_P)
10890 exit when Ekind (Id) = E_Package
10891 and then Renamed_Object (Id) = Act_P;
10893 Set_Is_Hidden (Id, True);
10894 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
10896 if Ekind (Id) = E_Package then
10897 Restore_Nested_Formal (Id);
10908 end Restore_Private_Views;
10915 (Gen_Unit : Entity_Id;
10916 Act_Unit : Entity_Id)
10920 Set_Instance_Env (Gen_Unit, Act_Unit);
10923 ----------------------------
10924 -- Save_Global_References --
10925 ----------------------------
10927 procedure Save_Global_References (N : Node_Id) is
10928 Gen_Scope : Entity_Id;
10932 function Is_Global (E : Entity_Id) return Boolean;
10933 -- Check whether entity is defined outside of generic unit. Examine the
10934 -- scope of an entity, and the scope of the scope, etc, until we find
10935 -- either Standard, in which case the entity is global, or the generic
10936 -- unit itself, which indicates that the entity is local. If the entity
10937 -- is the generic unit itself, as in the case of a recursive call, or
10938 -- the enclosing generic unit, if different from the current scope, then
10939 -- it is local as well, because it will be replaced at the point of
10940 -- instantiation. On the other hand, if it is a reference to a child
10941 -- unit of a common ancestor, which appears in an instantiation, it is
10942 -- global because it is used to denote a specific compilation unit at
10943 -- the time the instantiations will be analyzed.
10945 procedure Reset_Entity (N : Node_Id);
10946 -- Save semantic information on global entity, so that it is not
10947 -- resolved again at instantiation time.
10949 procedure Save_Entity_Descendants (N : Node_Id);
10950 -- Apply Save_Global_References to the two syntactic descendants of
10951 -- non-terminal nodes that carry an Associated_Node and are processed
10952 -- through Reset_Entity. Once the global entity (if any) has been
10953 -- captured together with its type, only two syntactic descendants need
10954 -- to be traversed to complete the processing of the tree rooted at N.
10955 -- This applies to Selected_Components, Expanded_Names, and to Operator
10956 -- nodes. N can also be a character literal, identifier, or operator
10957 -- symbol node, but the call has no effect in these cases.
10959 procedure Save_Global_Defaults (N1, N2 : Node_Id);
10960 -- Default actuals in nested instances must be handled specially
10961 -- because there is no link to them from the original tree. When an
10962 -- actual subprogram is given by a default, we add an explicit generic
10963 -- association for it in the instantiation node. When we save the
10964 -- global references on the name of the instance, we recover the list
10965 -- of generic associations, and add an explicit one to the original
10966 -- generic tree, through which a global actual can be preserved.
10967 -- Similarly, if a child unit is instantiated within a sibling, in the
10968 -- context of the parent, we must preserve the identifier of the parent
10969 -- so that it can be properly resolved in a subsequent instantiation.
10971 procedure Save_Global_Descendant (D : Union_Id);
10972 -- Apply Save_Global_References recursively to the descendents of the
10975 procedure Save_References (N : Node_Id);
10976 -- This is the recursive procedure that does the work, once the
10977 -- enclosing generic scope has been established.
10983 function Is_Global (E : Entity_Id) return Boolean is
10984 Se : Entity_Id := Scope (E);
10986 function Is_Instance_Node (Decl : Node_Id) return Boolean;
10987 -- Determine whether the parent node of a reference to a child unit
10988 -- denotes an instantiation or a formal package, in which case the
10989 -- reference to the child unit is global, even if it appears within
10990 -- the current scope (e.g. when the instance appears within the body
10991 -- of an ancestor).
10993 ----------------------
10994 -- Is_Instance_Node --
10995 ----------------------
10997 function Is_Instance_Node (Decl : Node_Id) return Boolean is
10999 return (Nkind (Decl) in N_Generic_Instantiation
11001 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
11002 end Is_Instance_Node;
11004 -- Start of processing for Is_Global
11007 if E = Gen_Scope then
11010 elsif E = Standard_Standard then
11013 elsif Is_Child_Unit (E)
11014 and then (Is_Instance_Node (Parent (N2))
11015 or else (Nkind (Parent (N2)) = N_Expanded_Name
11016 and then N2 = Selector_Name (Parent (N2))
11017 and then Is_Instance_Node (Parent (Parent (N2)))))
11022 while Se /= Gen_Scope loop
11023 if Se = Standard_Standard then
11038 procedure Reset_Entity (N : Node_Id) is
11040 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
11041 -- If the type of N2 is global to the generic unit. Save
11042 -- the type in the generic node.
11044 function Top_Ancestor (E : Entity_Id) return Entity_Id;
11045 -- Find the ultimate ancestor of the current unit. If it is
11046 -- not a generic unit, then the name of the current unit
11047 -- in the prefix of an expanded name must be replaced with
11048 -- its generic homonym to ensure that it will be properly
11049 -- resolved in an instance.
11051 ---------------------
11052 -- Set_Global_Type --
11053 ---------------------
11055 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
11056 Typ : constant Entity_Id := Etype (N2);
11059 Set_Etype (N, Typ);
11061 if Entity (N) /= N2
11062 and then Has_Private_View (Entity (N))
11064 -- If the entity of N is not the associated node, this is
11065 -- a nested generic and it has an associated node as well,
11066 -- whose type is already the full view (see below). Indicate
11067 -- that the original node has a private view.
11069 Set_Has_Private_View (N);
11072 -- If not a private type, nothing else to do
11074 if not Is_Private_Type (Typ) then
11075 if Is_Array_Type (Typ)
11076 and then Is_Private_Type (Component_Type (Typ))
11078 Set_Has_Private_View (N);
11081 -- If it is a derivation of a private type in a context where
11082 -- no full view is needed, nothing to do either.
11084 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
11087 -- Otherwise mark the type for flipping and use the full_view
11091 Set_Has_Private_View (N);
11093 if Present (Full_View (Typ)) then
11094 Set_Etype (N2, Full_View (Typ));
11097 end Set_Global_Type;
11103 function Top_Ancestor (E : Entity_Id) return Entity_Id is
11104 Par : Entity_Id := E;
11107 while Is_Child_Unit (Par) loop
11108 Par := Scope (Par);
11114 -- Start of processing for Reset_Entity
11117 N2 := Get_Associated_Node (N);
11120 if Present (E) then
11121 if Is_Global (E) then
11122 Set_Global_Type (N, N2);
11124 elsif Nkind (N) = N_Op_Concat
11125 and then Is_Generic_Type (Etype (N2))
11127 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
11128 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
11129 and then Is_Intrinsic_Subprogram (E)
11134 -- Entity is local. Mark generic node as unresolved.
11135 -- Note that now it does not have an entity.
11137 Set_Associated_Node (N, Empty);
11138 Set_Etype (N, Empty);
11141 if Nkind (Parent (N)) in N_Generic_Instantiation
11142 and then N = Name (Parent (N))
11144 Save_Global_Defaults (Parent (N), Parent (N2));
11147 elsif Nkind (Parent (N)) = N_Selected_Component
11148 and then Nkind (Parent (N2)) = N_Expanded_Name
11150 if Is_Global (Entity (Parent (N2))) then
11151 Change_Selected_Component_To_Expanded_Name (Parent (N));
11152 Set_Associated_Node (Parent (N), Parent (N2));
11153 Set_Global_Type (Parent (N), Parent (N2));
11154 Save_Entity_Descendants (N);
11156 -- If this is a reference to the current generic entity, replace
11157 -- by the name of the generic homonym of the current package. This
11158 -- is because in an instantiation Par.P.Q will not resolve to the
11159 -- name of the instance, whose enclosing scope is not necessarily
11160 -- Par. We use the generic homonym rather that the name of the
11161 -- generic itself, because it may be hidden by a local
11164 elsif In_Open_Scopes (Entity (Parent (N2)))
11166 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
11168 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
11169 Rewrite (Parent (N),
11170 Make_Identifier (Sloc (N),
11172 Chars (Generic_Homonym (Entity (Parent (N2))))));
11174 Rewrite (Parent (N),
11175 Make_Identifier (Sloc (N),
11176 Chars => Chars (Selector_Name (Parent (N2)))));
11180 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
11181 and then Parent (N) = Name (Parent (Parent (N)))
11183 Save_Global_Defaults
11184 (Parent (Parent (N)), Parent (Parent ((N2))));
11187 -- A selected component may denote a static constant that has been
11188 -- folded. If the static constant is global to the generic, capture
11189 -- its value. Otherwise the folding will happen in any instantiation,
11191 elsif Nkind (Parent (N)) = N_Selected_Component
11192 and then (Nkind (Parent (N2)) = N_Integer_Literal
11193 or else Nkind (Parent (N2)) = N_Real_Literal)
11195 if Present (Entity (Original_Node (Parent (N2))))
11196 and then Is_Global (Entity (Original_Node (Parent (N2))))
11198 Rewrite (Parent (N), New_Copy (Parent (N2)));
11199 Set_Analyzed (Parent (N), False);
11205 -- A selected component may be transformed into a parameterless
11206 -- function call. If the called entity is global, rewrite the node
11207 -- appropriately, i.e. as an extended name for the global entity.
11209 elsif Nkind (Parent (N)) = N_Selected_Component
11210 and then Nkind (Parent (N2)) = N_Function_Call
11211 and then N = Selector_Name (Parent (N))
11213 if No (Parameter_Associations (Parent (N2))) then
11214 if Is_Global (Entity (Name (Parent (N2)))) then
11215 Change_Selected_Component_To_Expanded_Name (Parent (N));
11216 Set_Associated_Node (Parent (N), Name (Parent (N2)));
11217 Set_Global_Type (Parent (N), Name (Parent (N2)));
11218 Save_Entity_Descendants (N);
11221 Set_Associated_Node (N, Empty);
11222 Set_Etype (N, Empty);
11225 -- In Ada 2005, X.F may be a call to a primitive operation,
11226 -- rewritten as F (X). This rewriting will be done again in an
11227 -- instance, so keep the original node. Global entities will be
11228 -- captured as for other constructs.
11234 -- Entity is local. Reset in generic unit, so that node is resolved
11235 -- anew at the point of instantiation.
11238 Set_Associated_Node (N, Empty);
11239 Set_Etype (N, Empty);
11243 -----------------------------
11244 -- Save_Entity_Descendants --
11245 -----------------------------
11247 procedure Save_Entity_Descendants (N : Node_Id) is
11250 when N_Binary_Op =>
11251 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
11252 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11255 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
11257 when N_Expanded_Name | N_Selected_Component =>
11258 Save_Global_Descendant (Union_Id (Prefix (N)));
11259 Save_Global_Descendant (Union_Id (Selector_Name (N)));
11261 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
11265 raise Program_Error;
11267 end Save_Entity_Descendants;
11269 --------------------------
11270 -- Save_Global_Defaults --
11271 --------------------------
11273 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
11274 Loc : constant Source_Ptr := Sloc (N1);
11275 Assoc2 : constant List_Id := Generic_Associations (N2);
11276 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
11283 Actual : Entity_Id;
11286 Assoc1 := Generic_Associations (N1);
11288 if Present (Assoc1) then
11289 Act1 := First (Assoc1);
11292 Set_Generic_Associations (N1, New_List);
11293 Assoc1 := Generic_Associations (N1);
11296 if Present (Assoc2) then
11297 Act2 := First (Assoc2);
11302 while Present (Act1) and then Present (Act2) loop
11307 -- Find the associations added for default suprograms
11309 if Present (Act2) then
11310 while Nkind (Act2) /= N_Generic_Association
11311 or else No (Entity (Selector_Name (Act2)))
11312 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
11317 -- Add a similar association if the default is global. The
11318 -- renaming declaration for the actual has been analyzed, and
11319 -- its alias is the program it renames. Link the actual in the
11320 -- original generic tree with the node in the analyzed tree.
11322 while Present (Act2) loop
11323 Subp := Entity (Selector_Name (Act2));
11324 Def := Explicit_Generic_Actual_Parameter (Act2);
11326 -- Following test is defence against rubbish errors
11328 if No (Alias (Subp)) then
11332 -- Retrieve the resolved actual from the renaming declaration
11333 -- created for the instantiated formal.
11335 Actual := Entity (Name (Parent (Parent (Subp))));
11336 Set_Entity (Def, Actual);
11337 Set_Etype (Def, Etype (Actual));
11339 if Is_Global (Actual) then
11341 Make_Generic_Association (Loc,
11342 Selector_Name => New_Occurrence_Of (Subp, Loc),
11343 Explicit_Generic_Actual_Parameter =>
11344 New_Occurrence_Of (Actual, Loc));
11346 Set_Associated_Node
11347 (Explicit_Generic_Actual_Parameter (Ndec), Def);
11349 Append (Ndec, Assoc1);
11351 -- If there are other defaults, add a dummy association in case
11352 -- there are other defaulted formals with the same name.
11354 elsif Present (Next (Act2)) then
11356 Make_Generic_Association (Loc,
11357 Selector_Name => New_Occurrence_Of (Subp, Loc),
11358 Explicit_Generic_Actual_Parameter => Empty);
11360 Append (Ndec, Assoc1);
11367 if Nkind (Name (N1)) = N_Identifier
11368 and then Is_Child_Unit (Gen_Id)
11369 and then Is_Global (Gen_Id)
11370 and then Is_Generic_Unit (Scope (Gen_Id))
11371 and then In_Open_Scopes (Scope (Gen_Id))
11373 -- This is an instantiation of a child unit within a sibling,
11374 -- so that the generic parent is in scope. An eventual instance
11375 -- must occur within the scope of an instance of the parent.
11376 -- Make name in instance into an expanded name, to preserve the
11377 -- identifier of the parent, so it can be resolved subsequently.
11379 Rewrite (Name (N2),
11380 Make_Expanded_Name (Loc,
11381 Chars => Chars (Gen_Id),
11382 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11383 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11384 Set_Entity (Name (N2), Gen_Id);
11386 Rewrite (Name (N1),
11387 Make_Expanded_Name (Loc,
11388 Chars => Chars (Gen_Id),
11389 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
11390 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
11392 Set_Associated_Node (Name (N1), Name (N2));
11393 Set_Associated_Node (Prefix (Name (N1)), Empty);
11394 Set_Associated_Node
11395 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
11396 Set_Etype (Name (N1), Etype (Gen_Id));
11399 end Save_Global_Defaults;
11401 ----------------------------
11402 -- Save_Global_Descendant --
11403 ----------------------------
11405 procedure Save_Global_Descendant (D : Union_Id) is
11409 if D in Node_Range then
11410 if D = Union_Id (Empty) then
11413 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
11414 Save_References (Node_Id (D));
11417 elsif D in List_Range then
11418 if D = Union_Id (No_List)
11419 or else Is_Empty_List (List_Id (D))
11424 N1 := First (List_Id (D));
11425 while Present (N1) loop
11426 Save_References (N1);
11431 -- Element list or other non-node field, nothing to do
11436 end Save_Global_Descendant;
11438 ---------------------
11439 -- Save_References --
11440 ---------------------
11442 -- This is the recursive procedure that does the work, once the
11443 -- enclosing generic scope has been established. We have to treat
11444 -- specially a number of node rewritings that are required by semantic
11445 -- processing and which change the kind of nodes in the generic copy:
11446 -- typically constant-folding, replacing an operator node by a string
11447 -- literal, or a selected component by an expanded name. In each of
11448 -- those cases, the transformation is propagated to the generic unit.
11450 procedure Save_References (N : Node_Id) is
11455 elsif Nkind (N) = N_Character_Literal
11456 or else Nkind (N) = N_Operator_Symbol
11458 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11461 elsif Nkind (N) = N_Operator_Symbol
11462 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
11464 Change_Operator_Symbol_To_String_Literal (N);
11467 elsif Nkind (N) in N_Op then
11468 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11469 if Nkind (N) = N_Op_Concat then
11470 Set_Is_Component_Left_Opnd (N,
11471 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11473 Set_Is_Component_Right_Opnd (N,
11474 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11480 -- Node may be transformed into call to a user-defined operator
11482 N2 := Get_Associated_Node (N);
11484 if Nkind (N2) = N_Function_Call then
11485 E := Entity (Name (N2));
11488 and then Is_Global (E)
11490 Set_Etype (N, Etype (N2));
11492 Set_Associated_Node (N, Empty);
11493 Set_Etype (N, Empty);
11496 elsif Nkind (N2) = N_Integer_Literal
11497 or else Nkind (N2) = N_Real_Literal
11498 or else Nkind (N2) = N_String_Literal
11500 if Present (Original_Node (N2))
11501 and then Nkind (Original_Node (N2)) = Nkind (N)
11504 -- Operation was constant-folded. Whenever possible,
11505 -- recover semantic information from unfolded node,
11508 Set_Associated_Node (N, Original_Node (N2));
11510 if Nkind (N) = N_Op_Concat then
11511 Set_Is_Component_Left_Opnd (N,
11512 Is_Component_Left_Opnd (Get_Associated_Node (N)));
11513 Set_Is_Component_Right_Opnd (N,
11514 Is_Component_Right_Opnd (Get_Associated_Node (N)));
11520 -- If original node is already modified, propagate
11521 -- constant-folding to template.
11523 Rewrite (N, New_Copy (N2));
11524 Set_Analyzed (N, False);
11527 elsif Nkind (N2) = N_Identifier
11528 and then Ekind (Entity (N2)) = E_Enumeration_Literal
11530 -- Same if call was folded into a literal, but in this case
11531 -- retain the entity to avoid spurious ambiguities if id is
11532 -- overloaded at the point of instantiation or inlining.
11534 Rewrite (N, New_Copy (N2));
11535 Set_Analyzed (N, False);
11539 -- Complete the check on operands, if node has not been
11540 -- constant-folded.
11542 if Nkind (N) in N_Op then
11543 Save_Entity_Descendants (N);
11546 elsif Nkind (N) = N_Identifier then
11547 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
11549 -- If this is a discriminant reference, always save it. It is
11550 -- used in the instance to find the corresponding discriminant
11551 -- positionally rather than by name.
11553 Set_Original_Discriminant
11554 (N, Original_Discriminant (Get_Associated_Node (N)));
11558 N2 := Get_Associated_Node (N);
11560 if Nkind (N2) = N_Function_Call then
11561 E := Entity (Name (N2));
11563 -- Name resolves to a call to parameterless function. If
11564 -- original entity is global, mark node as resolved.
11567 and then Is_Global (E)
11569 Set_Etype (N, Etype (N2));
11571 Set_Associated_Node (N, Empty);
11572 Set_Etype (N, Empty);
11576 (Nkind (N2) = N_Integer_Literal
11578 Nkind (N2) = N_Real_Literal)
11579 and then Is_Entity_Name (Original_Node (N2))
11581 -- Name resolves to named number that is constant-folded,
11582 -- We must preserve the original name for ASIS use, and
11583 -- undo the constant-folding, which will be repeated in
11586 Set_Associated_Node (N, Original_Node (N2));
11589 elsif Nkind (N2) = N_String_Literal then
11591 -- Name resolves to string literal. Perform the same
11592 -- replacement in generic.
11594 Rewrite (N, New_Copy (N2));
11596 elsif Nkind (N2) = N_Explicit_Dereference then
11598 -- An identifier is rewritten as a dereference if it is
11599 -- the prefix in a selected component, and it denotes an
11600 -- access to a composite type, or a parameterless function
11601 -- call that returns an access type.
11603 -- Check whether corresponding entity in prefix is global
11605 if Is_Entity_Name (Prefix (N2))
11606 and then Present (Entity (Prefix (N2)))
11607 and then Is_Global (Entity (Prefix (N2)))
11610 Make_Explicit_Dereference (Sloc (N),
11611 Prefix => Make_Identifier (Sloc (N),
11612 Chars => Chars (N))));
11613 Set_Associated_Node (Prefix (N), Prefix (N2));
11615 elsif Nkind (Prefix (N2)) = N_Function_Call
11616 and then Is_Global (Entity (Name (Prefix (N2))))
11619 Make_Explicit_Dereference (Sloc (N),
11620 Prefix => Make_Function_Call (Sloc (N),
11622 Make_Identifier (Sloc (N),
11623 Chars => Chars (N)))));
11625 Set_Associated_Node
11626 (Name (Prefix (N)), Name (Prefix (N2)));
11629 Set_Associated_Node (N, Empty);
11630 Set_Etype (N, Empty);
11633 -- The subtype mark of a nominally unconstrained object is
11634 -- rewritten as a subtype indication using the bounds of the
11635 -- expression. Recover the original subtype mark.
11637 elsif Nkind (N2) = N_Subtype_Indication
11638 and then Is_Entity_Name (Original_Node (N2))
11640 Set_Associated_Node (N, Original_Node (N2));
11648 elsif Nkind (N) in N_Entity then
11653 Loc : constant Source_Ptr := Sloc (N);
11654 Qual : Node_Id := Empty;
11655 Typ : Entity_Id := Empty;
11658 use Atree.Unchecked_Access;
11659 -- This code section is part of implementing an untyped tree
11660 -- traversal, so it needs direct access to node fields.
11663 if Nkind (N) = N_Aggregate
11665 Nkind (N) = N_Extension_Aggregate
11667 N2 := Get_Associated_Node (N);
11674 -- In an instance within a generic, use the name of
11675 -- the actual and not the original generic parameter.
11676 -- If the actual is global in the current generic it
11677 -- must be preserved for its instantiation.
11679 if Nkind (Parent (Typ)) = N_Subtype_Declaration
11681 Present (Generic_Parent_Type (Parent (Typ)))
11683 Typ := Base_Type (Typ);
11684 Set_Etype (N2, Typ);
11690 or else not Is_Global (Typ)
11692 Set_Associated_Node (N, Empty);
11694 -- If the aggregate is an actual in a call, it has been
11695 -- resolved in the current context, to some local type.
11696 -- The enclosing call may have been disambiguated by the
11697 -- aggregate, and this disambiguation might fail at
11698 -- instantiation time because the type to which the
11699 -- aggregate did resolve is not preserved. In order to
11700 -- preserve some of this information, we wrap the
11701 -- aggregate in a qualified expression, using the id of
11702 -- its type. For further disambiguation we qualify the
11703 -- type name with its scope (if visible) because both
11704 -- id's will have corresponding entities in an instance.
11705 -- This resolves most of the problems with missing type
11706 -- information on aggregates in instances.
11708 if Nkind (N2) = Nkind (N)
11710 (Nkind (Parent (N2)) = N_Procedure_Call_Statement
11711 or else Nkind (Parent (N2)) = N_Function_Call)
11712 and then Comes_From_Source (Typ)
11714 if Is_Immediately_Visible (Scope (Typ)) then
11715 Nam := Make_Selected_Component (Loc,
11717 Make_Identifier (Loc, Chars (Scope (Typ))),
11719 Make_Identifier (Loc, Chars (Typ)));
11721 Nam := Make_Identifier (Loc, Chars (Typ));
11725 Make_Qualified_Expression (Loc,
11726 Subtype_Mark => Nam,
11727 Expression => Relocate_Node (N));
11731 Save_Global_Descendant (Field1 (N));
11732 Save_Global_Descendant (Field2 (N));
11733 Save_Global_Descendant (Field3 (N));
11734 Save_Global_Descendant (Field5 (N));
11736 if Present (Qual) then
11740 -- All other cases than aggregates
11743 Save_Global_Descendant (Field1 (N));
11744 Save_Global_Descendant (Field2 (N));
11745 Save_Global_Descendant (Field3 (N));
11746 Save_Global_Descendant (Field4 (N));
11747 Save_Global_Descendant (Field5 (N));
11751 end Save_References;
11753 -- Start of processing for Save_Global_References
11756 Gen_Scope := Current_Scope;
11758 -- If the generic unit is a child unit, references to entities in the
11759 -- parent are treated as local, because they will be resolved anew in
11760 -- the context of the instance of the parent.
11762 while Is_Child_Unit (Gen_Scope)
11763 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
11765 Gen_Scope := Scope (Gen_Scope);
11768 Save_References (N);
11769 end Save_Global_References;
11771 --------------------------------------
11772 -- Set_Copied_Sloc_For_Inlined_Body --
11773 --------------------------------------
11775 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
11777 Create_Instantiation_Source (N, E, True, S_Adjustment);
11778 end Set_Copied_Sloc_For_Inlined_Body;
11780 ---------------------
11781 -- Set_Instance_Of --
11782 ---------------------
11784 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
11786 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
11787 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
11788 Generic_Renamings.Increment_Last;
11789 end Set_Instance_Of;
11791 --------------------
11792 -- Set_Next_Assoc --
11793 --------------------
11795 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
11797 Generic_Renamings.Table (E).Next_In_HTable := Next;
11798 end Set_Next_Assoc;
11800 -------------------
11801 -- Start_Generic --
11802 -------------------
11804 procedure Start_Generic is
11806 -- ??? More things could be factored out in this routine.
11807 -- Should probably be done at a later stage.
11809 Generic_Flags.Append (Inside_A_Generic);
11810 Inside_A_Generic := True;
11812 Expander_Mode_Save_And_Set (False);
11815 ----------------------
11816 -- Set_Instance_Env --
11817 ----------------------
11819 procedure Set_Instance_Env
11820 (Gen_Unit : Entity_Id;
11821 Act_Unit : Entity_Id)
11824 -- Regardless of the current mode, predefined units are analyzed in
11825 -- the most current Ada mode, and earlier version Ada checks do not
11826 -- apply to predefined units. Nothing needs to be done for non-internal
11827 -- units. These are always analyzed in the current mode.
11829 if Is_Internal_File_Name
11830 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
11831 Renamings_Included => True)
11833 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
11836 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
11837 end Set_Instance_Env;
11843 procedure Switch_View (T : Entity_Id) is
11844 BT : constant Entity_Id := Base_Type (T);
11845 Priv_Elmt : Elmt_Id := No_Elmt;
11846 Priv_Sub : Entity_Id;
11849 -- T may be private but its base type may have been exchanged through
11850 -- some other occurrence, in which case there is nothing to switch
11851 -- besides T itself. Note that a private dependent subtype of a private
11852 -- type might not have been switched even if the base type has been,
11853 -- because of the last branch of Check_Private_View (see comment there).
11855 if not Is_Private_Type (BT) then
11856 Prepend_Elmt (Full_View (T), Exchanged_Views);
11857 Exchange_Declarations (T);
11861 Priv_Elmt := First_Elmt (Private_Dependents (BT));
11863 if Present (Full_View (BT)) then
11864 Prepend_Elmt (Full_View (BT), Exchanged_Views);
11865 Exchange_Declarations (BT);
11868 while Present (Priv_Elmt) loop
11869 Priv_Sub := (Node (Priv_Elmt));
11871 -- We avoid flipping the subtype if the Etype of its full view is
11872 -- private because this would result in a malformed subtype. This
11873 -- occurs when the Etype of the subtype full view is the full view of
11874 -- the base type (and since the base types were just switched, the
11875 -- subtype is pointing to the wrong view). This is currently the case
11876 -- for tagged record types, access types (maybe more?) and needs to
11877 -- be resolved. ???
11879 if Present (Full_View (Priv_Sub))
11880 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
11882 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
11883 Exchange_Declarations (Priv_Sub);
11886 Next_Elmt (Priv_Elmt);
11890 -----------------------------
11891 -- Valid_Default_Attribute --
11892 -----------------------------
11894 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
11895 Attr_Id : constant Attribute_Id :=
11896 Get_Attribute_Id (Attribute_Name (Def));
11897 T : constant Entity_Id := Entity (Prefix (Def));
11898 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
11911 F := First_Formal (Nam);
11912 while Present (F) loop
11913 Num_F := Num_F + 1;
11918 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
11919 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
11920 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
11921 Attribute_Unbiased_Rounding =>
11924 and then Is_Floating_Point_Type (T);
11926 when Attribute_Image | Attribute_Pred | Attribute_Succ |
11927 Attribute_Value | Attribute_Wide_Image |
11928 Attribute_Wide_Value =>
11929 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
11931 when Attribute_Max | Attribute_Min =>
11932 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
11934 when Attribute_Input =>
11935 OK := (Is_Fun and then Num_F = 1);
11937 when Attribute_Output | Attribute_Read | Attribute_Write =>
11938 OK := (not Is_Fun and then Num_F = 2);
11945 Error_Msg_N ("attribute reference has wrong profile for subprogram",
11948 end Valid_Default_Attribute;
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