1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects; use Aspects;
27 with Atree; use Atree;
28 with Contracts; use Contracts;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Expander; use Expander;
33 with Exp_Disp; use Exp_Disp;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
36 with Freeze; use Freeze;
37 with Ghost; use Ghost;
38 with Itypes; use Itypes;
40 with Lib.Load; use Lib.Load;
41 with Lib.Xref; use Lib.Xref;
42 with Nlists; use Nlists;
43 with Namet; use Namet;
44 with Nmake; use Nmake;
46 with Rident; use Rident;
47 with Restrict; use Restrict;
48 with Rtsfind; use Rtsfind;
50 with Sem_Aux; use Sem_Aux;
51 with Sem_Cat; use Sem_Cat;
52 with Sem_Ch3; use Sem_Ch3;
53 with Sem_Ch6; use Sem_Ch6;
54 with Sem_Ch7; use Sem_Ch7;
55 with Sem_Ch8; use Sem_Ch8;
56 with Sem_Ch10; use Sem_Ch10;
57 with Sem_Ch13; use Sem_Ch13;
58 with Sem_Dim; use Sem_Dim;
59 with Sem_Disp; use Sem_Disp;
60 with Sem_Elab; use Sem_Elab;
61 with Sem_Elim; use Sem_Elim;
62 with Sem_Eval; use Sem_Eval;
63 with Sem_Prag; use Sem_Prag;
64 with Sem_Res; use Sem_Res;
65 with Sem_Type; use Sem_Type;
66 with Sem_Util; use Sem_Util;
67 with Sem_Warn; use Sem_Warn;
68 with Stand; use Stand;
69 with Sinfo; use Sinfo;
70 with Sinfo.CN; use Sinfo.CN;
71 with Sinput; use Sinput;
72 with Sinput.L; use Sinput.L;
73 with Snames; use Snames;
74 with Stringt; use Stringt;
75 with Uname; use Uname;
77 with Tbuild; use Tbuild;
78 with Uintp; use Uintp;
79 with Urealp; use Urealp;
80 with Warnsw; use Warnsw;
84 package body Sem_Ch12 is
86 ----------------------------------------------------------
87 -- Implementation of Generic Analysis and Instantiation --
88 ----------------------------------------------------------
90 -- GNAT implements generics by macro expansion. No attempt is made to share
91 -- generic instantiations (for now). Analysis of a generic definition does
92 -- not perform any expansion action, but the expander must be called on the
93 -- tree for each instantiation, because the expansion may of course depend
94 -- on the generic actuals. All of this is best achieved as follows:
96 -- a) Semantic analysis of a generic unit is performed on a copy of the
97 -- tree for the generic unit. All tree modifications that follow analysis
98 -- do not affect the original tree. Links are kept between the original
99 -- tree and the copy, in order to recognize non-local references within
100 -- the generic, and propagate them to each instance (recall that name
101 -- resolution is done on the generic declaration: generics are not really
102 -- macros). This is summarized in the following diagram:
104 -- .-----------. .----------.
105 -- | semantic |<--------------| generic |
107 -- | |==============>| |
108 -- |___________| global |__________|
119 -- b) Each instantiation copies the original tree, and inserts into it a
120 -- series of declarations that describe the mapping between generic formals
121 -- and actuals. For example, a generic In OUT parameter is an object
122 -- renaming of the corresponding actual, etc. Generic IN parameters are
123 -- constant declarations.
125 -- c) In order to give the right visibility for these renamings, we use
126 -- a different scheme for package and subprogram instantiations. For
127 -- packages, the list of renamings is inserted into the package
128 -- specification, before the visible declarations of the package. The
129 -- renamings are analyzed before any of the text of the instance, and are
130 -- thus visible at the right place. Furthermore, outside of the instance,
131 -- the generic parameters are visible and denote their corresponding
134 -- For subprograms, we create a container package to hold the renamings
135 -- and the subprogram instance itself. Analysis of the package makes the
136 -- renaming declarations visible to the subprogram. After analyzing the
137 -- package, the defining entity for the subprogram is touched-up so that
138 -- it appears declared in the current scope, and not inside the container
141 -- If the instantiation is a compilation unit, the container package is
142 -- given the same name as the subprogram instance. This ensures that
143 -- the elaboration procedure called by the binder, using the compilation
144 -- unit name, calls in fact the elaboration procedure for the package.
146 -- Not surprisingly, private types complicate this approach. By saving in
147 -- the original generic object the non-local references, we guarantee that
148 -- the proper entities are referenced at the point of instantiation.
149 -- However, for private types, this by itself does not insure that the
150 -- proper VIEW of the entity is used (the full type may be visible at the
151 -- point of generic definition, but not at instantiation, or vice-versa).
152 -- In order to reference the proper view, we special-case any reference
153 -- to private types in the generic object, by saving both views, one in
154 -- the generic and one in the semantic copy. At time of instantiation, we
155 -- check whether the two views are consistent, and exchange declarations if
156 -- necessary, in order to restore the correct visibility. Similarly, if
157 -- the instance view is private when the generic view was not, we perform
158 -- the exchange. After completing the instantiation, we restore the
159 -- current visibility. The flag Has_Private_View marks identifiers in the
160 -- the generic unit that require checking.
162 -- Visibility within nested generic units requires special handling.
163 -- Consider the following scheme:
165 -- type Global is ... -- outside of generic unit.
169 -- type Semi_Global is ... -- global to inner.
172 -- procedure inner (X1 : Global; X2 : Semi_Global);
174 -- procedure in2 is new inner (...); -- 4
177 -- package New_Outer is new Outer (...); -- 2
178 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
180 -- The semantic analysis of Outer captures all occurrences of Global.
181 -- The semantic analysis of Inner (at 1) captures both occurrences of
182 -- Global and Semi_Global.
184 -- At point 2 (instantiation of Outer), we also produce a generic copy
185 -- of Inner, even though Inner is, at that point, not being instantiated.
186 -- (This is just part of the semantic analysis of New_Outer).
188 -- Critically, references to Global within Inner must be preserved, while
189 -- references to Semi_Global should not preserved, because they must now
190 -- resolve to an entity within New_Outer. To distinguish between these, we
191 -- use a global variable, Current_Instantiated_Parent, which is set when
192 -- performing a generic copy during instantiation (at 2). This variable is
193 -- used when performing a generic copy that is not an instantiation, but
194 -- that is nested within one, as the occurrence of 1 within 2. The analysis
195 -- of a nested generic only preserves references that are global to the
196 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
197 -- determine whether a reference is external to the given parent.
199 -- The instantiation at point 3 requires no special treatment. The method
200 -- works as well for further nestings of generic units, but of course the
201 -- variable Current_Instantiated_Parent must be stacked because nested
202 -- instantiations can occur, e.g. the occurrence of 4 within 2.
204 -- The instantiation of package and subprogram bodies is handled in a
205 -- similar manner, except that it is delayed until after semantic
206 -- analysis is complete. In this fashion complex cross-dependencies
207 -- between several package declarations and bodies containing generics
208 -- can be compiled which otherwise would diagnose spurious circularities.
210 -- For example, it is possible to compile two packages A and B that
211 -- have the following structure:
213 -- package A is package B is
214 -- generic ... generic ...
215 -- package G_A is package G_B is
218 -- package body A is package body B is
219 -- package N_B is new G_B (..) package N_A is new G_A (..)
221 -- The table Pending_Instantiations in package Inline is used to keep
222 -- track of body instantiations that are delayed in this manner. Inline
223 -- handles the actual calls to do the body instantiations. This activity
224 -- is part of Inline, since the processing occurs at the same point, and
225 -- for essentially the same reason, as the handling of inlined routines.
227 ----------------------------------------------
228 -- Detection of Instantiation Circularities --
229 ----------------------------------------------
231 -- If we have a chain of instantiations that is circular, this is static
232 -- error which must be detected at compile time. The detection of these
233 -- circularities is carried out at the point that we insert a generic
234 -- instance spec or body. If there is a circularity, then the analysis of
235 -- the offending spec or body will eventually result in trying to load the
236 -- same unit again, and we detect this problem as we analyze the package
237 -- instantiation for the second time.
239 -- At least in some cases after we have detected the circularity, we get
240 -- into trouble if we try to keep going. The following flag is set if a
241 -- circularity is detected, and used to abandon compilation after the
242 -- messages have been posted.
244 -----------------------------------------
245 -- Implementation of Generic Contracts --
246 -----------------------------------------
248 -- A "contract" is a collection of aspects and pragmas that either verify a
249 -- property of a construct at runtime or classify the data flow to and from
250 -- the construct in some fashion.
252 -- Generic packages, subprograms and their respective bodies may be subject
253 -- to the following contract-related aspects or pragmas collectively known
256 -- package subprogram [body]
257 -- Abstract_State Contract_Cases
258 -- Initial_Condition Depends
259 -- Initializes Extensions_Visible
262 -- Refined_State Post_Class
272 -- Most package contract annotations utilize forward references to classify
273 -- data declared within the package [body]. Subprogram annotations then use
274 -- the classifications to further refine them. These inter dependencies are
275 -- problematic with respect to the implementation of generics because their
276 -- analysis, capture of global references and instantiation does not mesh
277 -- well with the existing mechanism.
279 -- 1) Analysis of generic contracts is carried out the same way non-generic
280 -- contracts are analyzed:
282 -- 1.1) General rule - a contract is analyzed after all related aspects
283 -- and pragmas are analyzed. This is done by routines
285 -- Analyze_Package_Body_Contract
286 -- Analyze_Package_Contract
287 -- Analyze_Subprogram_Body_Contract
288 -- Analyze_Subprogram_Contract
290 -- 1.2) Compilation unit - the contract is analyzed after Pragmas_After
293 -- 1.3) Compilation unit body - the contract is analyzed at the end of
294 -- the body declaration list.
296 -- 1.4) Package - the contract is analyzed at the end of the private or
297 -- visible declarations, prior to analyzing the contracts of any nested
298 -- packages or subprograms.
300 -- 1.5) Package body - the contract is analyzed at the end of the body
301 -- declaration list, prior to analyzing the contracts of any nested
302 -- packages or subprograms.
304 -- 1.6) Subprogram - if the subprogram is declared inside a block, a
305 -- package or a subprogram, then its contract is analyzed at the end of
306 -- the enclosing declarations, otherwise the subprogram is a compilation
309 -- 1.7) Subprogram body - if the subprogram body is declared inside a
310 -- block, a package body or a subprogram body, then its contract is
311 -- analyzed at the end of the enclosing declarations, otherwise the
312 -- subprogram is a compilation unit 1.3).
314 -- 2) Capture of global references within contracts is done after capturing
315 -- global references within the generic template. There are two reasons for
316 -- this delay - pragma annotations are not part of the generic template in
317 -- the case of a generic subprogram declaration, and analysis of contracts
320 -- Contract-related source pragmas within generic templates are prepared
321 -- for delayed capture of global references by routine
323 -- Create_Generic_Contract
325 -- The routine associates these pragmas with the contract of the template.
326 -- In the case of a generic subprogram declaration, the routine creates
327 -- generic templates for the pragmas declared after the subprogram because
328 -- they are not part of the template.
330 -- generic -- template starts
331 -- procedure Gen_Proc (Input : Integer); -- template ends
332 -- pragma Precondition (Input > 0); -- requires own template
334 -- 2.1) The capture of global references with aspect specifications and
335 -- source pragmas that apply to a generic unit must be suppressed when
336 -- the generic template is being processed because the contracts have not
337 -- been analyzed yet. Any attempts to capture global references at that
338 -- point will destroy the Associated_Node linkages and leave the template
339 -- undecorated. This delay is controlled by routine
341 -- Requires_Delayed_Save
343 -- 2.2) The real capture of global references within a contract is done
344 -- after the contract has been analyzed, by routine
346 -- Save_Global_References_In_Contract
348 -- 3) The instantiation of a generic contract occurs as part of the
349 -- instantiation of the contract owner. Generic subprogram declarations
350 -- require additional processing when the contract is specified by pragmas
351 -- because the pragmas are not part of the generic template. This is done
354 -- Instantiate_Subprogram_Contract
356 Circularity_Detected : Boolean := False;
357 -- This should really be reset on encountering a new main unit, but in
358 -- practice we are not using multiple main units so it is not critical.
360 --------------------------------------------------
361 -- Formal packages and partial parameterization --
362 --------------------------------------------------
364 -- When compiling a generic, a formal package is a local instantiation. If
365 -- declared with a box, its generic formals are visible in the enclosing
366 -- generic. If declared with a partial list of actuals, those actuals that
367 -- are defaulted (covered by an Others clause, or given an explicit box
368 -- initialization) are also visible in the enclosing generic, while those
369 -- that have a corresponding actual are not.
371 -- In our source model of instantiation, the same visibility must be
372 -- present in the spec and body of an instance: the names of the formals
373 -- that are defaulted must be made visible within the instance, and made
374 -- invisible (hidden) after the instantiation is complete, so that they
375 -- are not accessible outside of the instance.
377 -- In a generic, a formal package is treated like a special instantiation.
378 -- Our Ada 95 compiler handled formals with and without box in different
379 -- ways. With partial parameterization, we use a single model for both.
380 -- We create a package declaration that consists of the specification of
381 -- the generic package, and a set of declarations that map the actuals
382 -- into local renamings, just as we do for bona fide instantiations. For
383 -- defaulted parameters and formals with a box, we copy directly the
384 -- declarations of the formal into this local package. The result is a
385 -- a package whose visible declarations may include generic formals. This
386 -- package is only used for type checking and visibility analysis, and
387 -- never reaches the back-end, so it can freely violate the placement
388 -- rules for generic formal declarations.
390 -- The list of declarations (renamings and copies of formals) is built
391 -- by Analyze_Associations, just as for regular instantiations.
393 -- At the point of instantiation, conformance checking must be applied only
394 -- to those parameters that were specified in the formal. We perform this
395 -- checking by creating another internal instantiation, this one including
396 -- only the renamings and the formals (the rest of the package spec is not
397 -- relevant to conformance checking). We can then traverse two lists: the
398 -- list of actuals in the instance that corresponds to the formal package,
399 -- and the list of actuals produced for this bogus instantiation. We apply
400 -- the conformance rules to those actuals that are not defaulted (i.e.
401 -- which still appear as generic formals.
403 -- When we compile an instance body we must make the right parameters
404 -- visible again. The predicate Is_Generic_Formal indicates which of the
405 -- formals should have its Is_Hidden flag reset.
407 -----------------------
408 -- Local subprograms --
409 -----------------------
411 procedure Abandon_Instantiation (N : Node_Id);
412 pragma No_Return (Abandon_Instantiation);
413 -- Posts an error message "instantiation abandoned" at the indicated node
414 -- and then raises the exception Instantiation_Error to do it.
416 procedure Analyze_Formal_Array_Type
417 (T : in out Entity_Id;
419 -- A formal array type is treated like an array type declaration, and
420 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
421 -- in-out, because in the case of an anonymous type the entity is
422 -- actually created in the procedure.
424 -- The following procedures treat other kinds of formal parameters
426 procedure Analyze_Formal_Derived_Interface_Type
431 procedure Analyze_Formal_Derived_Type
436 procedure Analyze_Formal_Interface_Type
441 -- The following subprograms create abbreviated declarations for formal
442 -- scalar types. We introduce an anonymous base of the proper class for
443 -- each of them, and define the formals as constrained first subtypes of
444 -- their bases. The bounds are expressions that are non-static in the
447 procedure Analyze_Formal_Decimal_Fixed_Point_Type
448 (T : Entity_Id; Def : Node_Id);
449 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
450 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
451 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
452 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
453 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
454 (T : Entity_Id; Def : Node_Id);
456 procedure Analyze_Formal_Private_Type
460 -- Creates a new private type, which does not require completion
462 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id);
463 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
465 procedure Analyze_Generic_Formal_Part (N : Node_Id);
466 -- Analyze generic formal part
468 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
469 -- Create a new access type with the given designated type
471 function Analyze_Associations
474 F_Copy : List_Id) return List_Id;
475 -- At instantiation time, build the list of associations between formals
476 -- and actuals. Each association becomes a renaming declaration for the
477 -- formal entity. F_Copy is the analyzed list of formals in the generic
478 -- copy. It is used to apply legality checks to the actuals. I_Node is the
479 -- instantiation node itself.
481 procedure Analyze_Subprogram_Instantiation
485 procedure Build_Instance_Compilation_Unit_Nodes
489 -- This procedure is used in the case where the generic instance of a
490 -- subprogram body or package body is a library unit. In this case, the
491 -- original library unit node for the generic instantiation must be
492 -- replaced by the resulting generic body, and a link made to a new
493 -- compilation unit node for the generic declaration. The argument N is
494 -- the original generic instantiation. Act_Body and Act_Decl are the body
495 -- and declaration of the instance (either package body and declaration
496 -- nodes or subprogram body and declaration nodes depending on the case).
497 -- On return, the node N has been rewritten with the actual body.
499 procedure Check_Access_Definition (N : Node_Id);
500 -- Subsidiary routine to null exclusion processing. Perform an assertion
501 -- check on Ada version and the presence of an access definition in N.
503 procedure Check_Formal_Packages (P_Id : Entity_Id);
504 -- Apply the following to all formal packages in generic associations
506 procedure Check_Formal_Package_Instance
507 (Formal_Pack : Entity_Id;
508 Actual_Pack : Entity_Id);
509 -- Verify that the actuals of the actual instance match the actuals of
510 -- the template for a formal package that is not declared with a box.
512 procedure Check_Forward_Instantiation (Decl : Node_Id);
513 -- If the generic is a local entity and the corresponding body has not
514 -- been seen yet, flag enclosing packages to indicate that it will be
515 -- elaborated after the generic body. Subprograms declared in the same
516 -- package cannot be inlined by the front end because front-end inlining
517 -- requires a strict linear order of elaboration.
519 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id;
520 -- Check if some association between formals and actuals requires to make
521 -- visible primitives of a tagged type, and make those primitives visible.
522 -- Return the list of primitives whose visibility is modified (to restore
523 -- their visibility later through Restore_Hidden_Primitives). If no
524 -- candidate is found then return No_Elist.
526 procedure Check_Hidden_Child_Unit
528 Gen_Unit : Entity_Id;
529 Act_Decl_Id : Entity_Id);
530 -- If the generic unit is an implicit child instance within a parent
531 -- instance, we need to make an explicit test that it is not hidden by
532 -- a child instance of the same name and parent.
534 procedure Check_Generic_Actuals
535 (Instance : Entity_Id;
536 Is_Formal_Box : Boolean);
537 -- Similar to previous one. Check the actuals in the instantiation,
538 -- whose views can change between the point of instantiation and the point
539 -- of instantiation of the body. In addition, mark the generic renamings
540 -- as generic actuals, so that they are not compatible with other actuals.
541 -- Recurse on an actual that is a formal package whose declaration has
544 function Contains_Instance_Of
547 N : Node_Id) return Boolean;
548 -- Inner is instantiated within the generic Outer. Check whether Inner
549 -- directly or indirectly contains an instance of Outer or of one of its
550 -- parents, in the case of a subunit. Each generic unit holds a list of
551 -- the entities instantiated within (at any depth). This procedure
552 -- determines whether the set of such lists contains a cycle, i.e. an
553 -- illegal circular instantiation.
555 function Denotes_Formal_Package
557 On_Exit : Boolean := False;
558 Instance : Entity_Id := Empty) return Boolean;
559 -- Returns True if E is a formal package of an enclosing generic, or
560 -- the actual for such a formal in an enclosing instantiation. If such
561 -- a package is used as a formal in an nested generic, or as an actual
562 -- in a nested instantiation, the visibility of ITS formals should not
563 -- be modified. When called from within Restore_Private_Views, the flag
564 -- On_Exit is true, to indicate that the search for a possible enclosing
565 -- instance should ignore the current one. In that case Instance denotes
566 -- the declaration for which this is an actual. This declaration may be
567 -- an instantiation in the source, or the internal instantiation that
568 -- corresponds to the actual for a formal package.
570 function Earlier (N1, N2 : Node_Id) return Boolean;
571 -- Yields True if N1 and N2 appear in the same compilation unit,
572 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
573 -- traversal of the tree for the unit. Used to determine the placement
574 -- of freeze nodes for instance bodies that may depend on other instances.
576 function Find_Actual_Type
578 Gen_Type : Entity_Id) return Entity_Id;
579 -- When validating the actual types of a child instance, check whether
580 -- the formal is a formal type of the parent unit, and retrieve the current
581 -- actual for it. Typ is the entity in the analyzed formal type declaration
582 -- (component or index type of an array type, or designated type of an
583 -- access formal) and Gen_Type is the enclosing analyzed formal array
584 -- or access type. The desired actual may be a formal of a parent, or may
585 -- be declared in a formal package of a parent. In both cases it is a
586 -- generic actual type because it appears within a visible instance.
587 -- Finally, it may be declared in a parent unit without being a formal
588 -- of that unit, in which case it must be retrieved by visibility.
589 -- Ambiguities may still arise if two homonyms are declared in two formal
590 -- packages, and the prefix of the formal type may be needed to resolve
591 -- the ambiguity in the instance ???
593 procedure Freeze_Subprogram_Body
594 (Inst_Node : Node_Id;
596 Pack_Id : Entity_Id);
597 -- The generic body may appear textually after the instance, including
598 -- in the proper body of a stub, or within a different package instance.
599 -- Given that the instance can only be elaborated after the generic, we
600 -- place freeze_nodes for the instance and/or for packages that may enclose
601 -- the instance and the generic, so that the back-end can establish the
602 -- proper order of elaboration.
604 function Get_Associated_Node (N : Node_Id) return Node_Id;
605 -- In order to propagate semantic information back from the analyzed copy
606 -- to the original generic, we maintain links between selected nodes in the
607 -- generic and their corresponding copies. At the end of generic analysis,
608 -- the routine Save_Global_References traverses the generic tree, examines
609 -- the semantic information, and preserves the links to those nodes that
610 -- contain global information. At instantiation, the information from the
611 -- associated node is placed on the new copy, so that name resolution is
614 -- Three kinds of source nodes have associated nodes:
616 -- a) those that can reference (denote) entities, that is identifiers,
617 -- character literals, expanded_names, operator symbols, operators,
618 -- and attribute reference nodes. These nodes have an Entity field
619 -- and are the set of nodes that are in N_Has_Entity.
621 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
623 -- c) selected components (N_Selected_Component)
625 -- For the first class, the associated node preserves the entity if it is
626 -- global. If the generic contains nested instantiations, the associated
627 -- node itself has been recopied, and a chain of them must be followed.
629 -- For aggregates, the associated node allows retrieval of the type, which
630 -- may otherwise not appear in the generic. The view of this type may be
631 -- different between generic and instantiation, and the full view can be
632 -- installed before the instantiation is analyzed. For aggregates of type
633 -- extensions, the same view exchange may have to be performed for some of
634 -- the ancestor types, if their view is private at the point of
637 -- Nodes that are selected components in the parse tree may be rewritten
638 -- as expanded names after resolution, and must be treated as potential
639 -- entity holders, which is why they also have an Associated_Node.
641 -- Nodes that do not come from source, such as freeze nodes, do not appear
642 -- in the generic tree, and need not have an associated node.
644 -- The associated node is stored in the Associated_Node field. Note that
645 -- this field overlaps Entity, which is fine, because the whole point is
646 -- that we don't need or want the normal Entity field in this situation.
648 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
649 -- Traverse the Exchanged_Views list to see if a type was private
650 -- and has already been flipped during this phase of instantiation.
652 procedure Hide_Current_Scope;
653 -- When instantiating a generic child unit, the parent context must be
654 -- present, but the instance and all entities that may be generated
655 -- must be inserted in the current scope. We leave the current scope
656 -- on the stack, but make its entities invisible to avoid visibility
657 -- problems. This is reversed at the end of the instantiation. This is
658 -- not done for the instantiation of the bodies, which only require the
659 -- instances of the generic parents to be in scope.
661 function In_Same_Declarative_Part
663 Inst : Node_Id) return Boolean;
664 -- True if the instantiation Inst and the given freeze_node F_Node appear
665 -- within the same declarative part, ignoring subunits, but with no inter-
666 -- vening subprograms or concurrent units. Used to find the proper plave
667 -- for the freeze node of an instance, when the generic is declared in a
668 -- previous instance. If predicate is true, the freeze node of the instance
669 -- can be placed after the freeze node of the previous instance, Otherwise
670 -- it has to be placed at the end of the current declarative part.
672 function In_Main_Context (E : Entity_Id) return Boolean;
673 -- Check whether an instantiation is in the context of the main unit.
674 -- Used to determine whether its body should be elaborated to allow
675 -- front-end inlining.
677 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
678 -- Add the context clause of the unit containing a generic unit to a
679 -- compilation unit that is, or contains, an instantiation.
682 -- Establish environment for subsequent instantiation. Separated from
683 -- Save_Env because data-structures for visibility handling must be
684 -- initialized before call to Check_Generic_Child_Unit.
686 procedure Inline_Instance_Body
688 Gen_Unit : Entity_Id;
690 -- If front-end inlining is requested, instantiate the package body,
691 -- and preserve the visibility of its compilation unit, to insure
692 -- that successive instantiations succeed.
694 procedure Insert_Freeze_Node_For_Instance
697 -- N denotes a package or a subprogram instantiation and F_Node is the
698 -- associated freeze node. Insert the freeze node before the first source
699 -- body which follows immediately after N. If no such body is found, the
700 -- freeze node is inserted at the end of the declarative region which
703 procedure Install_Body
708 -- If the instantiation happens textually before the body of the generic,
709 -- the instantiation of the body must be analyzed after the generic body,
710 -- and not at the point of instantiation. Such early instantiations can
711 -- happen if the generic and the instance appear in a package declaration
712 -- because the generic body can only appear in the corresponding package
713 -- body. Early instantiations can also appear if generic, instance and
714 -- body are all in the declarative part of a subprogram or entry. Entities
715 -- of packages that are early instantiations are delayed, and their freeze
716 -- node appears after the generic body.
718 procedure Install_Formal_Packages (Par : Entity_Id);
719 -- Install the visible part of any formal of the parent that is a formal
720 -- package. Note that for the case of a formal package with a box, this
721 -- includes the formal part of the formal package (12.7(10/2)).
723 procedure Install_Hidden_Primitives
724 (Prims_List : in out Elist_Id;
727 -- Remove suffix 'P' from hidden primitives of Act_T to match the
728 -- visibility of primitives of Gen_T. The list of primitives to which
729 -- the suffix is removed is added to Prims_List to restore them later.
731 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
732 -- When compiling an instance of a child unit the parent (which is
733 -- itself an instance) is an enclosing scope that must be made
734 -- immediately visible. This procedure is also used to install the non-
735 -- generic parent of a generic child unit when compiling its body, so
736 -- that full views of types in the parent are made visible.
738 -- The functions Instantiate_XXX perform various legality checks and build
739 -- the declarations for instantiated generic parameters. In all of these
740 -- Formal is the entity in the generic unit, Actual is the entity of
741 -- expression in the generic associations, and Analyzed_Formal is the
742 -- formal in the generic copy, which contains the semantic information to
743 -- be used to validate the actual.
745 function Instantiate_Object
748 Analyzed_Formal : Node_Id) return List_Id;
750 function Instantiate_Type
753 Analyzed_Formal : Node_Id;
754 Actual_Decls : List_Id) return List_Id;
756 function Instantiate_Formal_Subprogram
759 Analyzed_Formal : Node_Id) return Node_Id;
761 function Instantiate_Formal_Package
764 Analyzed_Formal : Node_Id) return List_Id;
765 -- If the formal package is declared with a box, special visibility rules
766 -- apply to its formals: they are in the visible part of the package. This
767 -- is true in the declarative region of the formal package, that is to say
768 -- in the enclosing generic or instantiation. For an instantiation, the
769 -- parameters of the formal package are made visible in an explicit step.
770 -- Furthermore, if the actual has a visible USE clause, these formals must
771 -- be made potentially use-visible as well. On exit from the enclosing
772 -- instantiation, the reverse must be done.
774 -- For a formal package declared without a box, there are conformance rules
775 -- that apply to the actuals in the generic declaration and the actuals of
776 -- the actual package in the enclosing instantiation. The simplest way to
777 -- apply these rules is to repeat the instantiation of the formal package
778 -- in the context of the enclosing instance, and compare the generic
779 -- associations of this instantiation with those of the actual package.
780 -- This internal instantiation only needs to contain the renamings of the
781 -- formals: the visible and private declarations themselves need not be
784 -- In Ada 2005, the formal package may be only partially parameterized.
785 -- In that case the visibility step must make visible those actuals whose
786 -- corresponding formals were given with a box. A final complication
787 -- involves inherited operations from formal derived types, which must
788 -- be visible if the type is.
790 function Is_In_Main_Unit (N : Node_Id) return Boolean;
791 -- Test if given node is in the main unit
793 procedure Load_Parent_Of_Generic
796 Body_Optional : Boolean := False);
797 -- If the generic appears in a separate non-generic library unit, load the
798 -- corresponding body to retrieve the body of the generic. N is the node
799 -- for the generic instantiation, Spec is the generic package declaration.
801 -- Body_Optional is a flag that indicates that the body is being loaded to
802 -- ensure that temporaries are generated consistently when there are other
803 -- instances in the current declarative part that precede the one being
804 -- loaded. In that case a missing body is acceptable.
806 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id);
807 -- Within the generic part, entities in the formal package are
808 -- visible. To validate subsequent type declarations, indicate
809 -- the correspondence between the entities in the analyzed formal,
810 -- and the entities in the actual package. There are three packages
811 -- involved in the instantiation of a formal package: the parent
812 -- generic P1 which appears in the generic declaration, the fake
813 -- instantiation P2 which appears in the analyzed generic, and whose
814 -- visible entities may be used in subsequent formals, and the actual
815 -- P3 in the instance. To validate subsequent formals, me indicate
816 -- that the entities in P2 are mapped into those of P3. The mapping of
817 -- entities has to be done recursively for nested packages.
819 procedure Move_Freeze_Nodes
823 -- Freeze nodes can be generated in the analysis of a generic unit, but
824 -- will not be seen by the back-end. It is necessary to move those nodes
825 -- to the enclosing scope if they freeze an outer entity. We place them
826 -- at the end of the enclosing generic package, which is semantically
829 procedure Preanalyze_Actuals (N : Node_Id; Inst : Entity_Id := Empty);
830 -- Analyze actuals to perform name resolution. Full resolution is done
831 -- later, when the expected types are known, but names have to be captured
832 -- before installing parents of generics, that are not visible for the
833 -- actuals themselves.
835 -- If Inst is present, it is the entity of the package instance. This
836 -- entity is marked as having a limited_view actual when some actual is
837 -- a limited view. This is used to place the instance body properly.
839 procedure Remove_Parent (In_Body : Boolean := False);
840 -- Reverse effect after instantiation of child is complete
842 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id);
843 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
846 procedure Set_Instance_Env
847 (Gen_Unit : Entity_Id;
848 Act_Unit : Entity_Id);
849 -- Save current instance on saved environment, to be used to determine
850 -- the global status of entities in nested instances. Part of Save_Env.
851 -- called after verifying that the generic unit is legal for the instance,
852 -- The procedure also examines whether the generic unit is a predefined
853 -- unit, in order to set configuration switches accordingly. As a result
854 -- the procedure must be called after analyzing and freezing the actuals.
856 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
857 -- Associate analyzed generic parameter with corresponding instance. Used
858 -- for semantic checks at instantiation time.
860 function True_Parent (N : Node_Id) return Node_Id;
861 -- For a subunit, return parent of corresponding stub, else return
864 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
865 -- Verify that an attribute that appears as the default for a formal
866 -- subprogram is a function or procedure with the correct profile.
868 -------------------------------------------
869 -- Data Structures for Generic Renamings --
870 -------------------------------------------
872 -- The map Generic_Renamings associates generic entities with their
873 -- corresponding actuals. Currently used to validate type instances. It
874 -- will eventually be used for all generic parameters to eliminate the
875 -- need for overload resolution in the instance.
877 type Assoc_Ptr is new Int;
879 Assoc_Null : constant Assoc_Ptr := -1;
884 Next_In_HTable : Assoc_Ptr;
887 package Generic_Renamings is new Table.Table
888 (Table_Component_Type => Assoc,
889 Table_Index_Type => Assoc_Ptr,
890 Table_Low_Bound => 0,
892 Table_Increment => 100,
893 Table_Name => "Generic_Renamings");
895 -- Variable to hold enclosing instantiation. When the environment is
896 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
898 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
900 -- Hash table for associations
902 HTable_Size : constant := 37;
903 type HTable_Range is range 0 .. HTable_Size - 1;
905 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
906 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
907 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
908 function Hash (F : Entity_Id) return HTable_Range;
910 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
911 Header_Num => HTable_Range,
913 Elmt_Ptr => Assoc_Ptr,
914 Null_Ptr => Assoc_Null,
915 Set_Next => Set_Next_Assoc,
918 Get_Key => Get_Gen_Id,
922 Exchanged_Views : Elist_Id;
923 -- This list holds the private views that have been exchanged during
924 -- instantiation to restore the visibility of the generic declaration.
925 -- (see comments above). After instantiation, the current visibility is
926 -- reestablished by means of a traversal of this list.
928 Hidden_Entities : Elist_Id;
929 -- This list holds the entities of the current scope that are removed
930 -- from immediate visibility when instantiating a child unit. Their
931 -- visibility is restored in Remove_Parent.
933 -- Because instantiations can be recursive, the following must be saved
934 -- on entry and restored on exit from an instantiation (spec or body).
935 -- This is done by the two procedures Save_Env and Restore_Env. For
936 -- package and subprogram instantiations (but not for the body instances)
937 -- the action of Save_Env is done in two steps: Init_Env is called before
938 -- Check_Generic_Child_Unit, because setting the parent instances requires
939 -- that the visibility data structures be properly initialized. Once the
940 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
942 Parent_Unit_Visible : Boolean := False;
943 -- Parent_Unit_Visible is used when the generic is a child unit, and
944 -- indicates whether the ultimate parent of the generic is visible in the
945 -- instantiation environment. It is used to reset the visibility of the
946 -- parent at the end of the instantiation (see Remove_Parent).
948 Instance_Parent_Unit : Entity_Id := Empty;
949 -- This records the ultimate parent unit of an instance of a generic
950 -- child unit and is used in conjunction with Parent_Unit_Visible to
951 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
953 type Instance_Env is record
954 Instantiated_Parent : Assoc;
955 Exchanged_Views : Elist_Id;
956 Hidden_Entities : Elist_Id;
957 Current_Sem_Unit : Unit_Number_Type;
958 Parent_Unit_Visible : Boolean := False;
959 Instance_Parent_Unit : Entity_Id := Empty;
960 Switches : Config_Switches_Type;
963 package Instance_Envs is new Table.Table (
964 Table_Component_Type => Instance_Env,
965 Table_Index_Type => Int,
966 Table_Low_Bound => 0,
968 Table_Increment => 100,
969 Table_Name => "Instance_Envs");
971 procedure Restore_Private_Views
972 (Pack_Id : Entity_Id;
973 Is_Package : Boolean := True);
974 -- Restore the private views of external types, and unmark the generic
975 -- renamings of actuals, so that they become compatible subtypes again.
976 -- For subprograms, Pack_Id is the package constructed to hold the
979 procedure Switch_View (T : Entity_Id);
980 -- Switch the partial and full views of a type and its private
981 -- dependents (i.e. its subtypes and derived types).
983 ------------------------------------
984 -- Structures for Error Reporting --
985 ------------------------------------
987 Instantiation_Node : Node_Id;
988 -- Used by subprograms that validate instantiation of formal parameters
989 -- where there might be no actual on which to place the error message.
990 -- Also used to locate the instantiation node for generic subunits.
992 Instantiation_Error : exception;
993 -- When there is a semantic error in the generic parameter matching,
994 -- there is no point in continuing the instantiation, because the
995 -- number of cascaded errors is unpredictable. This exception aborts
996 -- the instantiation process altogether.
998 S_Adjustment : Sloc_Adjustment;
999 -- Offset created for each node in an instantiation, in order to keep
1000 -- track of the source position of the instantiation in each of its nodes.
1001 -- A subsequent semantic error or warning on a construct of the instance
1002 -- points to both places: the original generic node, and the point of
1003 -- instantiation. See Sinput and Sinput.L for additional details.
1005 ------------------------------------------------------------
1006 -- Data structure for keeping track when inside a Generic --
1007 ------------------------------------------------------------
1009 -- The following table is used to save values of the Inside_A_Generic
1010 -- flag (see spec of Sem) when they are saved by Start_Generic.
1012 package Generic_Flags is new Table.Table (
1013 Table_Component_Type => Boolean,
1014 Table_Index_Type => Int,
1015 Table_Low_Bound => 0,
1016 Table_Initial => 32,
1017 Table_Increment => 200,
1018 Table_Name => "Generic_Flags");
1020 ---------------------------
1021 -- Abandon_Instantiation --
1022 ---------------------------
1024 procedure Abandon_Instantiation (N : Node_Id) is
1026 Error_Msg_N ("\instantiation abandoned!", N);
1027 raise Instantiation_Error;
1028 end Abandon_Instantiation;
1030 --------------------------------
1031 -- Add_Pending_Instantiation --
1032 --------------------------------
1034 procedure Add_Pending_Instantiation (Inst : Node_Id; Act_Decl : Node_Id) is
1037 -- Add to the instantiation node and the corresponding unit declaration
1038 -- the current values of global flags to be used when analyzing the
1041 Pending_Instantiations.Append
1042 ((Inst_Node => Inst,
1043 Act_Decl => Act_Decl,
1044 Expander_Status => Expander_Active,
1045 Current_Sem_Unit => Current_Sem_Unit,
1046 Scope_Suppress => Scope_Suppress,
1047 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
1048 Version => Ada_Version,
1049 Version_Pragma => Ada_Version_Pragma,
1050 Warnings => Save_Warnings,
1051 SPARK_Mode => SPARK_Mode,
1052 SPARK_Mode_Pragma => SPARK_Mode_Pragma));
1053 end Add_Pending_Instantiation;
1055 ----------------------------------
1056 -- Adjust_Inherited_Pragma_Sloc --
1057 ----------------------------------
1059 procedure Adjust_Inherited_Pragma_Sloc (N : Node_Id) is
1061 Adjust_Instantiation_Sloc (N, S_Adjustment);
1062 end Adjust_Inherited_Pragma_Sloc;
1064 --------------------------
1065 -- Analyze_Associations --
1066 --------------------------
1068 function Analyze_Associations
1071 F_Copy : List_Id) return List_Id
1073 Actuals_To_Freeze : constant Elist_Id := New_Elmt_List;
1074 Assoc : constant List_Id := New_List;
1075 Default_Actuals : constant List_Id := New_List;
1076 Gen_Unit : constant Entity_Id :=
1077 Defining_Entity (Parent (F_Copy));
1081 Analyzed_Formal : Node_Id;
1082 First_Named : Node_Id := Empty;
1086 Saved_Formal : Node_Id;
1088 Default_Formals : constant List_Id := New_List;
1089 -- If an Others_Choice is present, some of the formals may be defaulted.
1090 -- To simplify the treatment of visibility in an instance, we introduce
1091 -- individual defaults for each such formal. These defaults are
1092 -- appended to the list of associations and replace the Others_Choice.
1094 Found_Assoc : Node_Id;
1095 -- Association for the current formal being match. Empty if there are
1096 -- no remaining actuals, or if there is no named association with the
1097 -- name of the formal.
1099 Is_Named_Assoc : Boolean;
1100 Num_Matched : Nat := 0;
1101 Num_Actuals : Nat := 0;
1103 Others_Present : Boolean := False;
1104 Others_Choice : Node_Id := Empty;
1105 -- In Ada 2005, indicates partial parameterization of a formal
1106 -- package. As usual an other association must be last in the list.
1108 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id);
1109 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1110 -- cannot have a named association for it. AI05-0025 extends this rule
1111 -- to formals of formal packages by AI05-0025, and it also applies to
1112 -- box-initialized formals.
1114 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean;
1115 -- Determine whether the parameter types and the return type of Subp
1116 -- are fully defined at the point of instantiation.
1118 function Matching_Actual
1120 A_F : Entity_Id) return Node_Id;
1121 -- Find actual that corresponds to a given a formal parameter. If the
1122 -- actuals are positional, return the next one, if any. If the actuals
1123 -- are named, scan the parameter associations to find the right one.
1124 -- A_F is the corresponding entity in the analyzed generic, which is
1125 -- placed on the selector name for ASIS use.
1127 -- In Ada 2005, a named association may be given with a box, in which
1128 -- case Matching_Actual sets Found_Assoc to the generic association,
1129 -- but return Empty for the actual itself. In this case the code below
1130 -- creates a corresponding declaration for the formal.
1132 function Partial_Parameterization return Boolean;
1133 -- Ada 2005: if no match is found for a given formal, check if the
1134 -- association for it includes a box, or whether the associations
1135 -- include an Others clause.
1137 procedure Process_Default (F : Entity_Id);
1138 -- Add a copy of the declaration of generic formal F to the list of
1139 -- associations, and add an explicit box association for F if there
1140 -- is none yet, and the default comes from an Others_Choice.
1142 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean;
1143 -- Determine whether Subp renames one of the subprograms defined in the
1144 -- generated package Standard.
1146 procedure Set_Analyzed_Formal;
1147 -- Find the node in the generic copy that corresponds to a given formal.
1148 -- The semantic information on this node is used to perform legality
1149 -- checks on the actuals. Because semantic analysis can introduce some
1150 -- anonymous entities or modify the declaration node itself, the
1151 -- correspondence between the two lists is not one-one. In addition to
1152 -- anonymous types, the presence a formal equality will introduce an
1153 -- implicit declaration for the corresponding inequality.
1155 ----------------------------------------
1156 -- Check_Overloaded_Formal_Subprogram --
1157 ----------------------------------------
1159 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is
1160 Temp_Formal : Entity_Id;
1163 Temp_Formal := First (Formals);
1164 while Present (Temp_Formal) loop
1165 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration
1166 and then Temp_Formal /= Formal
1168 Chars (Defining_Unit_Name (Specification (Formal))) =
1169 Chars (Defining_Unit_Name (Specification (Temp_Formal)))
1171 if Present (Found_Assoc) then
1173 ("named association not allowed for overloaded formal",
1178 ("named association not allowed for overloaded formal",
1182 Abandon_Instantiation (Instantiation_Node);
1187 end Check_Overloaded_Formal_Subprogram;
1189 -------------------------------
1190 -- Has_Fully_Defined_Profile --
1191 -------------------------------
1193 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean is
1194 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean;
1195 -- Determine whethet type Typ is fully defined
1197 ---------------------------
1198 -- Is_Fully_Defined_Type --
1199 ---------------------------
1201 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean is
1203 -- A private type without a full view is not fully defined
1205 if Is_Private_Type (Typ)
1206 and then No (Full_View (Typ))
1210 -- An incomplete type is never fully defined
1212 elsif Is_Incomplete_Type (Typ) then
1215 -- All other types are fully defined
1220 end Is_Fully_Defined_Type;
1222 -- Local declarations
1226 -- Start of processing for Has_Fully_Defined_Profile
1229 -- Check the parameters
1231 Param := First_Formal (Subp);
1232 while Present (Param) loop
1233 if not Is_Fully_Defined_Type (Etype (Param)) then
1237 Next_Formal (Param);
1240 -- Check the return type
1242 return Is_Fully_Defined_Type (Etype (Subp));
1243 end Has_Fully_Defined_Profile;
1245 ---------------------
1246 -- Matching_Actual --
1247 ---------------------
1249 function Matching_Actual
1251 A_F : Entity_Id) return Node_Id
1257 Is_Named_Assoc := False;
1259 -- End of list of purely positional parameters
1261 if No (Actual) or else Nkind (Actual) = N_Others_Choice then
1262 Found_Assoc := Empty;
1265 -- Case of positional parameter corresponding to current formal
1267 elsif No (Selector_Name (Actual)) then
1268 Found_Assoc := Actual;
1269 Act := Explicit_Generic_Actual_Parameter (Actual);
1270 Num_Matched := Num_Matched + 1;
1273 -- Otherwise scan list of named actuals to find the one with the
1274 -- desired name. All remaining actuals have explicit names.
1277 Is_Named_Assoc := True;
1278 Found_Assoc := Empty;
1282 while Present (Actual) loop
1283 if Nkind (Actual) = N_Others_Choice then
1284 Found_Assoc := Empty;
1287 elsif Chars (Selector_Name (Actual)) = Chars (F) then
1288 Set_Entity (Selector_Name (Actual), A_F);
1289 Set_Etype (Selector_Name (Actual), Etype (A_F));
1290 Generate_Reference (A_F, Selector_Name (Actual));
1292 Found_Assoc := Actual;
1293 Act := Explicit_Generic_Actual_Parameter (Actual);
1294 Num_Matched := Num_Matched + 1;
1302 -- Reset for subsequent searches. In most cases the named
1303 -- associations are in order. If they are not, we reorder them
1304 -- to avoid scanning twice the same actual. This is not just a
1305 -- question of efficiency: there may be multiple defaults with
1306 -- boxes that have the same name. In a nested instantiation we
1307 -- insert actuals for those defaults, and cannot rely on their
1308 -- names to disambiguate them.
1310 if Actual = First_Named then
1313 elsif Present (Actual) then
1314 Insert_Before (First_Named, Remove_Next (Prev));
1317 Actual := First_Named;
1320 if Is_Entity_Name (Act) and then Present (Entity (Act)) then
1321 Set_Used_As_Generic_Actual (Entity (Act));
1325 end Matching_Actual;
1327 ------------------------------
1328 -- Partial_Parameterization --
1329 ------------------------------
1331 function Partial_Parameterization return Boolean is
1333 return Others_Present
1334 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc));
1335 end Partial_Parameterization;
1337 ---------------------
1338 -- Process_Default --
1339 ---------------------
1341 procedure Process_Default (F : Entity_Id) is
1342 Loc : constant Source_Ptr := Sloc (I_Node);
1343 F_Id : constant Entity_Id := Defining_Entity (F);
1349 -- Append copy of formal declaration to associations, and create new
1350 -- defining identifier for it.
1352 Decl := New_Copy_Tree (F);
1353 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id));
1355 if Nkind (F) in N_Formal_Subprogram_Declaration then
1356 Set_Defining_Unit_Name (Specification (Decl), Id);
1359 Set_Defining_Identifier (Decl, Id);
1362 Append (Decl, Assoc);
1364 if No (Found_Assoc) then
1366 Make_Generic_Association (Loc,
1368 New_Occurrence_Of (Id, Loc),
1369 Explicit_Generic_Actual_Parameter => Empty);
1370 Set_Box_Present (Default);
1371 Append (Default, Default_Formals);
1373 end Process_Default;
1375 ---------------------------------
1376 -- Renames_Standard_Subprogram --
1377 ---------------------------------
1379 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean is
1384 while Present (Id) loop
1385 if Scope (Id) = Standard_Standard then
1393 end Renames_Standard_Subprogram;
1395 -------------------------
1396 -- Set_Analyzed_Formal --
1397 -------------------------
1399 procedure Set_Analyzed_Formal is
1403 while Present (Analyzed_Formal) loop
1404 Kind := Nkind (Analyzed_Formal);
1406 case Nkind (Formal) is
1408 when N_Formal_Subprogram_Declaration =>
1409 exit when Kind in N_Formal_Subprogram_Declaration
1412 (Defining_Unit_Name (Specification (Formal))) =
1414 (Defining_Unit_Name (Specification (Analyzed_Formal)));
1416 when N_Formal_Package_Declaration =>
1417 exit when Nkind_In (Kind, N_Formal_Package_Declaration,
1418 N_Generic_Package_Declaration,
1419 N_Package_Declaration);
1421 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
1425 -- Skip freeze nodes, and nodes inserted to replace
1426 -- unrecognized pragmas.
1429 Kind not in N_Formal_Subprogram_Declaration
1430 and then not Nkind_In (Kind, N_Subprogram_Declaration,
1434 and then Chars (Defining_Identifier (Formal)) =
1435 Chars (Defining_Identifier (Analyzed_Formal));
1438 Next (Analyzed_Formal);
1440 end Set_Analyzed_Formal;
1442 -- Start of processing for Analyze_Associations
1445 Actuals := Generic_Associations (I_Node);
1447 if Present (Actuals) then
1449 -- Check for an Others choice, indicating a partial parameterization
1450 -- for a formal package.
1452 Actual := First (Actuals);
1453 while Present (Actual) loop
1454 if Nkind (Actual) = N_Others_Choice then
1455 Others_Present := True;
1456 Others_Choice := Actual;
1458 if Present (Next (Actual)) then
1459 Error_Msg_N ("others must be last association", Actual);
1462 -- This subprogram is used both for formal packages and for
1463 -- instantiations. For the latter, associations must all be
1466 if Nkind (I_Node) /= N_Formal_Package_Declaration
1467 and then Comes_From_Source (I_Node)
1470 ("others association not allowed in an instance",
1474 -- In any case, nothing to do after the others association
1478 elsif Box_Present (Actual)
1479 and then Comes_From_Source (I_Node)
1480 and then Nkind (I_Node) /= N_Formal_Package_Declaration
1483 ("box association not allowed in an instance", Actual);
1489 -- If named associations are present, save first named association
1490 -- (it may of course be Empty) to facilitate subsequent name search.
1492 First_Named := First (Actuals);
1493 while Present (First_Named)
1494 and then Nkind (First_Named) /= N_Others_Choice
1495 and then No (Selector_Name (First_Named))
1497 Num_Actuals := Num_Actuals + 1;
1502 Named := First_Named;
1503 while Present (Named) loop
1504 if Nkind (Named) /= N_Others_Choice
1505 and then No (Selector_Name (Named))
1507 Error_Msg_N ("invalid positional actual after named one", Named);
1508 Abandon_Instantiation (Named);
1511 -- A named association may lack an actual parameter, if it was
1512 -- introduced for a default subprogram that turns out to be local
1513 -- to the outer instantiation. If it has a box association it must
1514 -- correspond to some formal in the generic.
1516 if Nkind (Named) /= N_Others_Choice
1517 and then (Present (Explicit_Generic_Actual_Parameter (Named))
1518 or else Box_Present (Named))
1520 Num_Actuals := Num_Actuals + 1;
1526 if Present (Formals) then
1527 Formal := First_Non_Pragma (Formals);
1528 Analyzed_Formal := First_Non_Pragma (F_Copy);
1530 if Present (Actuals) then
1531 Actual := First (Actuals);
1533 -- All formals should have default values
1539 while Present (Formal) loop
1540 Set_Analyzed_Formal;
1541 Saved_Formal := Next_Non_Pragma (Formal);
1543 case Nkind (Formal) is
1544 when N_Formal_Object_Declaration =>
1547 (Defining_Identifier (Formal),
1548 Defining_Identifier (Analyzed_Formal));
1550 if No (Match) and then Partial_Parameterization then
1551 Process_Default (Formal);
1555 (Instantiate_Object (Formal, Match, Analyzed_Formal),
1558 -- For a defaulted in_parameter, create an entry in the
1559 -- the list of defaulted actuals, for GNATProve use. Do
1560 -- not included these defaults for an instance nested
1561 -- within a generic, because the defaults are also used
1562 -- in the analysis of the enclosing generic, and only
1563 -- defaulted subprograms are relevant there.
1565 if No (Match) and then not Inside_A_Generic then
1566 Append_To (Default_Actuals,
1567 Make_Generic_Association (Sloc (I_Node),
1570 (Defining_Identifier (Formal), Sloc (I_Node)),
1571 Explicit_Generic_Actual_Parameter =>
1572 New_Copy_Tree (Default_Expression (Formal))));
1576 -- If the object is a call to an expression function, this
1577 -- is a freezing point for it.
1579 if Is_Entity_Name (Match)
1580 and then Present (Entity (Match))
1582 (Original_Node (Unit_Declaration_Node (Entity (Match))))
1583 = N_Expression_Function
1585 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1588 when N_Formal_Type_Declaration =>
1591 (Defining_Identifier (Formal),
1592 Defining_Identifier (Analyzed_Formal));
1595 if Partial_Parameterization then
1596 Process_Default (Formal);
1599 Error_Msg_Sloc := Sloc (Gen_Unit);
1602 Instantiation_Node, Defining_Identifier (Formal));
1604 ("\in instantiation of & declared#",
1605 Instantiation_Node, Gen_Unit);
1606 Abandon_Instantiation (Instantiation_Node);
1613 (Formal, Match, Analyzed_Formal, Assoc),
1616 -- An instantiation is a freeze point for the actuals,
1617 -- unless this is a rewritten formal package, or the
1618 -- formal is an Ada 2012 formal incomplete type.
1620 if Nkind (I_Node) = N_Formal_Package_Declaration
1622 (Ada_Version >= Ada_2012
1624 Ekind (Defining_Identifier (Analyzed_Formal)) =
1630 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1634 -- A remote access-to-class-wide type is not a legal actual
1635 -- for a generic formal of an access type (E.2.2(17/2)).
1636 -- In GNAT an exception to this rule is introduced when
1637 -- the formal is marked as remote using implementation
1638 -- defined aspect/pragma Remote_Access_Type. In that case
1639 -- the actual must be remote as well.
1641 -- If the current instantiation is the construction of a
1642 -- local copy for a formal package the actuals may be
1643 -- defaulted, and there is no matching actual to check.
1645 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1647 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1648 N_Access_To_Object_Definition
1649 and then Present (Match)
1652 Formal_Ent : constant Entity_Id :=
1653 Defining_Identifier (Analyzed_Formal);
1655 if Is_Remote_Access_To_Class_Wide_Type (Entity (Match))
1656 = Is_Remote_Types (Formal_Ent)
1658 -- Remoteness of formal and actual match
1662 elsif Is_Remote_Types (Formal_Ent) then
1664 -- Remote formal, non-remote actual
1667 ("actual for& must be remote", Match, Formal_Ent);
1670 -- Non-remote formal, remote actual
1673 ("actual for& may not be remote",
1679 when N_Formal_Subprogram_Declaration =>
1682 (Defining_Unit_Name (Specification (Formal)),
1683 Defining_Unit_Name (Specification (Analyzed_Formal)));
1685 -- If the formal subprogram has the same name as another
1686 -- formal subprogram of the generic, then a named
1687 -- association is illegal (12.3(9)). Exclude named
1688 -- associations that are generated for a nested instance.
1691 and then Is_Named_Assoc
1692 and then Comes_From_Source (Found_Assoc)
1694 Check_Overloaded_Formal_Subprogram (Formal);
1697 -- If there is no corresponding actual, this may be case
1698 -- of partial parameterization, or else the formal has a
1699 -- default or a box.
1701 if No (Match) and then Partial_Parameterization then
1702 Process_Default (Formal);
1704 if Nkind (I_Node) = N_Formal_Package_Declaration then
1705 Check_Overloaded_Formal_Subprogram (Formal);
1710 Instantiate_Formal_Subprogram
1711 (Formal, Match, Analyzed_Formal));
1713 -- An instantiation is a freeze point for the actuals,
1714 -- unless this is a rewritten formal package.
1716 if Nkind (I_Node) /= N_Formal_Package_Declaration
1717 and then Nkind (Match) = N_Identifier
1718 and then Is_Subprogram (Entity (Match))
1720 -- The actual subprogram may rename a routine defined
1721 -- in Standard. Avoid freezing such renamings because
1722 -- subprograms coming from Standard cannot be frozen.
1725 not Renames_Standard_Subprogram (Entity (Match))
1727 -- If the actual subprogram comes from a different
1728 -- unit, it is already frozen, either by a body in
1729 -- that unit or by the end of the declarative part
1730 -- of the unit. This check avoids the freezing of
1731 -- subprograms defined in Standard which are used
1732 -- as generic actuals.
1734 and then In_Same_Code_Unit (Entity (Match), I_Node)
1735 and then Has_Fully_Defined_Profile (Entity (Match))
1737 -- Mark the subprogram as having a delayed freeze
1738 -- since this may be an out-of-order action.
1740 Set_Has_Delayed_Freeze (Entity (Match));
1741 Append_Elmt (Entity (Match), Actuals_To_Freeze);
1745 -- If this is a nested generic, preserve default for later
1746 -- instantiations. We do this as well for GNATProve use,
1747 -- so that the list of generic associations is complete.
1749 if No (Match) and then Box_Present (Formal) then
1751 Subp : constant Entity_Id :=
1752 Defining_Unit_Name (Specification (Last (Assoc)));
1755 Append_To (Default_Actuals,
1756 Make_Generic_Association (Sloc (I_Node),
1758 New_Occurrence_Of (Subp, Sloc (I_Node)),
1759 Explicit_Generic_Actual_Parameter =>
1760 New_Occurrence_Of (Subp, Sloc (I_Node))));
1764 when N_Formal_Package_Declaration =>
1767 (Defining_Identifier (Formal),
1768 Defining_Identifier (Original_Node (Analyzed_Formal)));
1771 if Partial_Parameterization then
1772 Process_Default (Formal);
1775 Error_Msg_Sloc := Sloc (Gen_Unit);
1778 Instantiation_Node, Defining_Identifier (Formal));
1780 ("\in instantiation of & declared#",
1781 Instantiation_Node, Gen_Unit);
1783 Abandon_Instantiation (Instantiation_Node);
1789 (Instantiate_Formal_Package
1790 (Formal, Match, Analyzed_Formal),
1794 -- For use type and use package appearing in the generic part,
1795 -- we have already copied them, so we can just move them where
1796 -- they belong (we mustn't recopy them since this would mess up
1797 -- the Sloc values).
1799 when N_Use_Package_Clause |
1800 N_Use_Type_Clause =>
1801 if Nkind (Original_Node (I_Node)) =
1802 N_Formal_Package_Declaration
1804 Append (New_Copy_Tree (Formal), Assoc);
1807 Append (Formal, Assoc);
1811 raise Program_Error;
1815 Formal := Saved_Formal;
1816 Next_Non_Pragma (Analyzed_Formal);
1819 if Num_Actuals > Num_Matched then
1820 Error_Msg_Sloc := Sloc (Gen_Unit);
1822 if Present (Selector_Name (Actual)) then
1824 ("unmatched actual &", Actual, Selector_Name (Actual));
1826 ("\in instantiation of & declared#", Actual, Gen_Unit);
1829 ("unmatched actual in instantiation of & declared#",
1834 elsif Present (Actuals) then
1836 ("too many actuals in generic instantiation", Instantiation_Node);
1839 -- An instantiation freezes all generic actuals. The only exceptions
1840 -- to this are incomplete types and subprograms which are not fully
1841 -- defined at the point of instantiation.
1844 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze);
1846 while Present (Elmt) loop
1847 Freeze_Before (I_Node, Node (Elmt));
1852 -- If there are default subprograms, normalize the tree by adding
1853 -- explicit associations for them. This is required if the instance
1854 -- appears within a generic.
1856 if not Is_Empty_List (Default_Actuals) then
1861 Default := First (Default_Actuals);
1862 while Present (Default) loop
1863 Mark_Rewrite_Insertion (Default);
1867 if No (Actuals) then
1868 Set_Generic_Associations (I_Node, Default_Actuals);
1870 Append_List_To (Actuals, Default_Actuals);
1875 -- If this is a formal package, normalize the parameter list by adding
1876 -- explicit box associations for the formals that are covered by an
1879 if not Is_Empty_List (Default_Formals) then
1880 Append_List (Default_Formals, Formals);
1884 end Analyze_Associations;
1886 -------------------------------
1887 -- Analyze_Formal_Array_Type --
1888 -------------------------------
1890 procedure Analyze_Formal_Array_Type
1891 (T : in out Entity_Id;
1897 -- Treated like a non-generic array declaration, with additional
1902 if Nkind (Def) = N_Constrained_Array_Definition then
1903 DSS := First (Discrete_Subtype_Definitions (Def));
1904 while Present (DSS) loop
1905 if Nkind_In (DSS, N_Subtype_Indication,
1907 N_Attribute_Reference)
1909 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1916 Array_Type_Declaration (T, Def);
1917 Set_Is_Generic_Type (Base_Type (T));
1919 if Ekind (Component_Type (T)) = E_Incomplete_Type
1920 and then No (Full_View (Component_Type (T)))
1922 Error_Msg_N ("premature usage of incomplete type", Def);
1924 -- Check that range constraint is not allowed on the component type
1925 -- of a generic formal array type (AARM 12.5.3(3))
1927 elsif Is_Internal (Component_Type (T))
1928 and then Present (Subtype_Indication (Component_Definition (Def)))
1929 and then Nkind (Original_Node
1930 (Subtype_Indication (Component_Definition (Def)))) =
1931 N_Subtype_Indication
1934 ("in a formal, a subtype indication can only be "
1935 & "a subtype mark (RM 12.5.3(3))",
1936 Subtype_Indication (Component_Definition (Def)));
1939 end Analyze_Formal_Array_Type;
1941 ---------------------------------------------
1942 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1943 ---------------------------------------------
1945 -- As for other generic types, we create a valid type representation with
1946 -- legal but arbitrary attributes, whose values are never considered
1947 -- static. For all scalar types we introduce an anonymous base type, with
1948 -- the same attributes. We choose the corresponding integer type to be
1949 -- Standard_Integer.
1950 -- Here and in other similar routines, the Sloc of the generated internal
1951 -- type must be the same as the sloc of the defining identifier of the
1952 -- formal type declaration, to provide proper source navigation.
1954 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1958 Loc : constant Source_Ptr := Sloc (Def);
1960 Base : constant Entity_Id :=
1962 (E_Decimal_Fixed_Point_Type,
1964 Sloc (Defining_Identifier (Parent (Def))), 'G');
1966 Int_Base : constant Entity_Id := Standard_Integer;
1967 Delta_Val : constant Ureal := Ureal_1;
1968 Digs_Val : constant Uint := Uint_6;
1970 function Make_Dummy_Bound return Node_Id;
1971 -- Return a properly typed universal real literal to use as a bound
1973 ----------------------
1974 -- Make_Dummy_Bound --
1975 ----------------------
1977 function Make_Dummy_Bound return Node_Id is
1978 Bound : constant Node_Id := Make_Real_Literal (Loc, Ureal_1);
1980 Set_Etype (Bound, Universal_Real);
1982 end Make_Dummy_Bound;
1984 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
1989 Set_Etype (Base, Base);
1990 Set_Size_Info (Base, Int_Base);
1991 Set_RM_Size (Base, RM_Size (Int_Base));
1992 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1993 Set_Digits_Value (Base, Digs_Val);
1994 Set_Delta_Value (Base, Delta_Val);
1995 Set_Small_Value (Base, Delta_Val);
1996 Set_Scalar_Range (Base,
1998 Low_Bound => Make_Dummy_Bound,
1999 High_Bound => Make_Dummy_Bound));
2001 Set_Is_Generic_Type (Base);
2002 Set_Parent (Base, Parent (Def));
2004 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
2005 Set_Etype (T, Base);
2006 Set_Size_Info (T, Int_Base);
2007 Set_RM_Size (T, RM_Size (Int_Base));
2008 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
2009 Set_Digits_Value (T, Digs_Val);
2010 Set_Delta_Value (T, Delta_Val);
2011 Set_Small_Value (T, Delta_Val);
2012 Set_Scalar_Range (T, Scalar_Range (Base));
2013 Set_Is_Constrained (T);
2015 Check_Restriction (No_Fixed_Point, Def);
2016 end Analyze_Formal_Decimal_Fixed_Point_Type;
2018 -------------------------------------------
2019 -- Analyze_Formal_Derived_Interface_Type --
2020 -------------------------------------------
2022 procedure Analyze_Formal_Derived_Interface_Type
2027 Loc : constant Source_Ptr := Sloc (Def);
2030 -- Rewrite as a type declaration of a derived type. This ensures that
2031 -- the interface list and primitive operations are properly captured.
2034 Make_Full_Type_Declaration (Loc,
2035 Defining_Identifier => T,
2036 Type_Definition => Def));
2038 Set_Is_Generic_Type (T);
2039 end Analyze_Formal_Derived_Interface_Type;
2041 ---------------------------------
2042 -- Analyze_Formal_Derived_Type --
2043 ---------------------------------
2045 procedure Analyze_Formal_Derived_Type
2050 Loc : constant Source_Ptr := Sloc (Def);
2051 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
2055 Set_Is_Generic_Type (T);
2057 if Private_Present (Def) then
2059 Make_Private_Extension_Declaration (Loc,
2060 Defining_Identifier => T,
2061 Discriminant_Specifications => Discriminant_Specifications (N),
2062 Unknown_Discriminants_Present => Unk_Disc,
2063 Subtype_Indication => Subtype_Mark (Def),
2064 Interface_List => Interface_List (Def));
2066 Set_Abstract_Present (New_N, Abstract_Present (Def));
2067 Set_Limited_Present (New_N, Limited_Present (Def));
2068 Set_Synchronized_Present (New_N, Synchronized_Present (Def));
2072 Make_Full_Type_Declaration (Loc,
2073 Defining_Identifier => T,
2074 Discriminant_Specifications =>
2075 Discriminant_Specifications (Parent (T)),
2077 Make_Derived_Type_Definition (Loc,
2078 Subtype_Indication => Subtype_Mark (Def)));
2080 Set_Abstract_Present
2081 (Type_Definition (New_N), Abstract_Present (Def));
2083 (Type_Definition (New_N), Limited_Present (Def));
2090 if not Is_Composite_Type (T) then
2092 ("unknown discriminants not allowed for elementary types", N);
2094 Set_Has_Unknown_Discriminants (T);
2095 Set_Is_Constrained (T, False);
2099 -- If the parent type has a known size, so does the formal, which makes
2100 -- legal representation clauses that involve the formal.
2102 Set_Size_Known_At_Compile_Time
2103 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
2104 end Analyze_Formal_Derived_Type;
2106 ----------------------------------
2107 -- Analyze_Formal_Discrete_Type --
2108 ----------------------------------
2110 -- The operations defined for a discrete types are those of an enumeration
2111 -- type. The size is set to an arbitrary value, for use in analyzing the
2114 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
2115 Loc : constant Source_Ptr := Sloc (Def);
2119 Base : constant Entity_Id :=
2121 (E_Floating_Point_Type, Current_Scope,
2122 Sloc (Defining_Identifier (Parent (Def))), 'G');
2126 Set_Ekind (T, E_Enumeration_Subtype);
2127 Set_Etype (T, Base);
2130 Set_Is_Generic_Type (T);
2131 Set_Is_Constrained (T);
2133 -- For semantic analysis, the bounds of the type must be set to some
2134 -- non-static value. The simplest is to create attribute nodes for those
2135 -- bounds, that refer to the type itself. These bounds are never
2136 -- analyzed but serve as place-holders.
2139 Make_Attribute_Reference (Loc,
2140 Attribute_Name => Name_First,
2141 Prefix => New_Occurrence_Of (T, Loc));
2145 Make_Attribute_Reference (Loc,
2146 Attribute_Name => Name_Last,
2147 Prefix => New_Occurrence_Of (T, Loc));
2150 Set_Scalar_Range (T,
2155 Set_Ekind (Base, E_Enumeration_Type);
2156 Set_Etype (Base, Base);
2157 Init_Size (Base, 8);
2158 Init_Alignment (Base);
2159 Set_Is_Generic_Type (Base);
2160 Set_Scalar_Range (Base, Scalar_Range (T));
2161 Set_Parent (Base, Parent (Def));
2162 end Analyze_Formal_Discrete_Type;
2164 ----------------------------------
2165 -- Analyze_Formal_Floating_Type --
2166 ---------------------------------
2168 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
2169 Base : constant Entity_Id :=
2171 (E_Floating_Point_Type, Current_Scope,
2172 Sloc (Defining_Identifier (Parent (Def))), 'G');
2175 -- The various semantic attributes are taken from the predefined type
2176 -- Float, just so that all of them are initialized. Their values are
2177 -- never used because no constant folding or expansion takes place in
2178 -- the generic itself.
2181 Set_Ekind (T, E_Floating_Point_Subtype);
2182 Set_Etype (T, Base);
2183 Set_Size_Info (T, (Standard_Float));
2184 Set_RM_Size (T, RM_Size (Standard_Float));
2185 Set_Digits_Value (T, Digits_Value (Standard_Float));
2186 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
2187 Set_Is_Constrained (T);
2189 Set_Is_Generic_Type (Base);
2190 Set_Etype (Base, Base);
2191 Set_Size_Info (Base, (Standard_Float));
2192 Set_RM_Size (Base, RM_Size (Standard_Float));
2193 Set_Digits_Value (Base, Digits_Value (Standard_Float));
2194 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
2195 Set_Parent (Base, Parent (Def));
2197 Check_Restriction (No_Floating_Point, Def);
2198 end Analyze_Formal_Floating_Type;
2200 -----------------------------------
2201 -- Analyze_Formal_Interface_Type;--
2202 -----------------------------------
2204 procedure Analyze_Formal_Interface_Type
2209 Loc : constant Source_Ptr := Sloc (N);
2214 Make_Full_Type_Declaration (Loc,
2215 Defining_Identifier => T,
2216 Type_Definition => Def);
2220 Set_Is_Generic_Type (T);
2221 end Analyze_Formal_Interface_Type;
2223 ---------------------------------
2224 -- Analyze_Formal_Modular_Type --
2225 ---------------------------------
2227 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
2229 -- Apart from their entity kind, generic modular types are treated like
2230 -- signed integer types, and have the same attributes.
2232 Analyze_Formal_Signed_Integer_Type (T, Def);
2233 Set_Ekind (T, E_Modular_Integer_Subtype);
2234 Set_Ekind (Etype (T), E_Modular_Integer_Type);
2236 end Analyze_Formal_Modular_Type;
2238 ---------------------------------------
2239 -- Analyze_Formal_Object_Declaration --
2240 ---------------------------------------
2242 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
2243 E : constant Node_Id := Default_Expression (N);
2244 Id : constant Node_Id := Defining_Identifier (N);
2251 -- Determine the mode of the formal object
2253 if Out_Present (N) then
2254 K := E_Generic_In_Out_Parameter;
2256 if not In_Present (N) then
2257 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
2261 K := E_Generic_In_Parameter;
2264 if Present (Subtype_Mark (N)) then
2265 Find_Type (Subtype_Mark (N));
2266 T := Entity (Subtype_Mark (N));
2268 -- Verify that there is no redundant null exclusion
2270 if Null_Exclusion_Present (N) then
2271 if not Is_Access_Type (T) then
2273 ("null exclusion can only apply to an access type", N);
2275 elsif Can_Never_Be_Null (T) then
2277 ("`NOT NULL` not allowed (& already excludes null)", N, T);
2281 -- Ada 2005 (AI-423): Formal object with an access definition
2284 Check_Access_Definition (N);
2285 T := Access_Definition
2287 N => Access_Definition (N));
2290 if Ekind (T) = E_Incomplete_Type then
2292 Error_Node : Node_Id;
2295 if Present (Subtype_Mark (N)) then
2296 Error_Node := Subtype_Mark (N);
2298 Check_Access_Definition (N);
2299 Error_Node := Access_Definition (N);
2302 Error_Msg_N ("premature usage of incomplete type", Error_Node);
2306 if K = E_Generic_In_Parameter then
2308 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2310 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then
2312 ("generic formal of mode IN must not be of limited type", N);
2313 Explain_Limited_Type (T, N);
2316 if Is_Abstract_Type (T) then
2318 ("generic formal of mode IN must not be of abstract type", N);
2322 Preanalyze_Spec_Expression (E, T);
2324 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then
2326 ("initialization not allowed for limited types", E);
2327 Explain_Limited_Type (T, E);
2334 -- Case of generic IN OUT parameter
2337 -- If the formal has an unconstrained type, construct its actual
2338 -- subtype, as is done for subprogram formals. In this fashion, all
2339 -- its uses can refer to specific bounds.
2344 if (Is_Array_Type (T) and then not Is_Constrained (T))
2345 or else (Ekind (T) = E_Record_Type and then Has_Discriminants (T))
2348 Non_Freezing_Ref : constant Node_Id :=
2349 New_Occurrence_Of (Id, Sloc (Id));
2353 -- Make sure the actual subtype doesn't generate bogus freezing
2355 Set_Must_Not_Freeze (Non_Freezing_Ref);
2356 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
2357 Insert_Before_And_Analyze (N, Decl);
2358 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
2361 Set_Actual_Subtype (Id, T);
2366 ("initialization not allowed for `IN OUT` formals", N);
2370 if Has_Aspects (N) then
2371 Analyze_Aspect_Specifications (N, Id);
2373 end Analyze_Formal_Object_Declaration;
2375 ----------------------------------------------
2376 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2377 ----------------------------------------------
2379 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2383 Loc : constant Source_Ptr := Sloc (Def);
2384 Base : constant Entity_Id :=
2386 (E_Ordinary_Fixed_Point_Type, Current_Scope,
2387 Sloc (Defining_Identifier (Parent (Def))), 'G');
2390 -- The semantic attributes are set for completeness only, their values
2391 -- will never be used, since all properties of the type are non-static.
2394 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
2395 Set_Etype (T, Base);
2396 Set_Size_Info (T, Standard_Integer);
2397 Set_RM_Size (T, RM_Size (Standard_Integer));
2398 Set_Small_Value (T, Ureal_1);
2399 Set_Delta_Value (T, Ureal_1);
2400 Set_Scalar_Range (T,
2402 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
2403 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
2404 Set_Is_Constrained (T);
2406 Set_Is_Generic_Type (Base);
2407 Set_Etype (Base, Base);
2408 Set_Size_Info (Base, Standard_Integer);
2409 Set_RM_Size (Base, RM_Size (Standard_Integer));
2410 Set_Small_Value (Base, Ureal_1);
2411 Set_Delta_Value (Base, Ureal_1);
2412 Set_Scalar_Range (Base, Scalar_Range (T));
2413 Set_Parent (Base, Parent (Def));
2415 Check_Restriction (No_Fixed_Point, Def);
2416 end Analyze_Formal_Ordinary_Fixed_Point_Type;
2418 ----------------------------------------
2419 -- Analyze_Formal_Package_Declaration --
2420 ----------------------------------------
2422 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is
2423 Gen_Id : constant Node_Id := Name (N);
2424 Loc : constant Source_Ptr := Sloc (N);
2425 Pack_Id : constant Entity_Id := Defining_Identifier (N);
2428 Gen_Unit : Entity_Id;
2431 Vis_Prims_List : Elist_Id := No_Elist;
2432 -- List of primitives made temporarily visible in the instantiation
2433 -- to match the visibility of the formal type.
2435 function Build_Local_Package return Node_Id;
2436 -- The formal package is rewritten so that its parameters are replaced
2437 -- with corresponding declarations. For parameters with bona fide
2438 -- associations these declarations are created by Analyze_Associations
2439 -- as for a regular instantiation. For boxed parameters, we preserve
2440 -- the formal declarations and analyze them, in order to introduce
2441 -- entities of the right kind in the environment of the formal.
2443 -------------------------
2444 -- Build_Local_Package --
2445 -------------------------
2447 function Build_Local_Package return Node_Id is
2449 Pack_Decl : Node_Id;
2452 -- Within the formal, the name of the generic package is a renaming
2453 -- of the formal (as for a regular instantiation).
2456 Make_Package_Declaration (Loc,
2459 (Specification (Original_Node (Gen_Decl)),
2460 Empty, Instantiating => True));
2463 Make_Package_Renaming_Declaration (Loc,
2464 Defining_Unit_Name =>
2465 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2466 Name => New_Occurrence_Of (Formal, Loc));
2468 if Nkind (Gen_Id) = N_Identifier
2469 and then Chars (Gen_Id) = Chars (Pack_Id)
2472 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2475 -- If the formal is declared with a box, or with an others choice,
2476 -- create corresponding declarations for all entities in the formal
2477 -- part, so that names with the proper types are available in the
2478 -- specification of the formal package.
2480 -- On the other hand, if there are no associations, then all the
2481 -- formals must have defaults, and this will be checked by the
2482 -- call to Analyze_Associations.
2485 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2488 Formal_Decl : Node_Id;
2491 -- TBA : for a formal package, need to recurse ???
2496 (Generic_Formal_Declarations (Original_Node (Gen_Decl)));
2497 while Present (Formal_Decl) loop
2499 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True));
2504 -- If generic associations are present, use Analyze_Associations to
2505 -- create the proper renaming declarations.
2509 Act_Tree : constant Node_Id :=
2511 (Original_Node (Gen_Decl), Empty,
2512 Instantiating => True);
2515 Generic_Renamings.Set_Last (0);
2516 Generic_Renamings_HTable.Reset;
2517 Instantiation_Node := N;
2520 Analyze_Associations
2521 (I_Node => Original_Node (N),
2522 Formals => Generic_Formal_Declarations (Act_Tree),
2523 F_Copy => Generic_Formal_Declarations (Gen_Decl));
2525 Vis_Prims_List := Check_Hidden_Primitives (Decls);
2529 Append (Renaming, To => Decls);
2531 -- Add generated declarations ahead of local declarations in
2534 if No (Visible_Declarations (Specification (Pack_Decl))) then
2535 Set_Visible_Declarations (Specification (Pack_Decl), Decls);
2538 (First (Visible_Declarations (Specification (Pack_Decl))),
2543 end Build_Local_Package;
2547 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode;
2548 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
2550 Associations : Boolean := True;
2552 Parent_Installed : Boolean := False;
2553 Parent_Instance : Entity_Id;
2554 Renaming_In_Par : Entity_Id;
2556 -- Start of processing for Analyze_Formal_Package_Declaration
2559 Check_Text_IO_Special_Unit (Gen_Id);
2562 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2563 Gen_Unit := Entity (Gen_Id);
2565 -- Check for a formal package that is a package renaming
2567 if Present (Renamed_Object (Gen_Unit)) then
2569 -- Indicate that unit is used, before replacing it with renamed
2570 -- entity for use below.
2572 if In_Extended_Main_Source_Unit (N) then
2573 Set_Is_Instantiated (Gen_Unit);
2574 Generate_Reference (Gen_Unit, N);
2577 Gen_Unit := Renamed_Object (Gen_Unit);
2580 if Ekind (Gen_Unit) /= E_Generic_Package then
2581 Error_Msg_N ("expect generic package name", Gen_Id);
2585 elsif Gen_Unit = Current_Scope then
2587 ("generic package cannot be used as a formal package of itself",
2592 elsif In_Open_Scopes (Gen_Unit) then
2593 if Is_Compilation_Unit (Gen_Unit)
2594 and then Is_Child_Unit (Current_Scope)
2596 -- Special-case the error when the formal is a parent, and
2597 -- continue analysis to minimize cascaded errors.
2600 ("generic parent cannot be used as formal package "
2601 & "of a child unit", Gen_Id);
2605 ("generic package cannot be used as a formal package "
2606 & "within itself", Gen_Id);
2612 -- Check that name of formal package does not hide name of generic,
2613 -- or its leading prefix. This check must be done separately because
2614 -- the name of the generic has already been analyzed.
2617 Gen_Name : Entity_Id;
2621 while Nkind (Gen_Name) = N_Expanded_Name loop
2622 Gen_Name := Prefix (Gen_Name);
2625 if Chars (Gen_Name) = Chars (Pack_Id) then
2627 ("& is hidden within declaration of formal package",
2633 or else No (Generic_Associations (N))
2634 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice
2636 Associations := False;
2639 -- If there are no generic associations, the generic parameters appear
2640 -- as local entities and are instantiated like them. We copy the generic
2641 -- package declaration as if it were an instantiation, and analyze it
2642 -- like a regular package, except that we treat the formals as
2643 -- additional visible components.
2645 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2647 if In_Extended_Main_Source_Unit (N) then
2648 Set_Is_Instantiated (Gen_Unit);
2649 Generate_Reference (Gen_Unit, N);
2652 Formal := New_Copy (Pack_Id);
2653 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2655 -- Make local generic without formals. The formals will be replaced with
2656 -- internal declarations.
2659 New_N := Build_Local_Package;
2661 -- If there are errors in the parameter list, Analyze_Associations
2662 -- raises Instantiation_Error. Patch the declaration to prevent further
2663 -- exception propagation.
2666 when Instantiation_Error =>
2667 Enter_Name (Formal);
2668 Set_Ekind (Formal, E_Variable);
2669 Set_Etype (Formal, Any_Type);
2670 Restore_Hidden_Primitives (Vis_Prims_List);
2672 if Parent_Installed then
2680 Set_Defining_Unit_Name (Specification (New_N), Formal);
2681 Set_Generic_Parent (Specification (N), Gen_Unit);
2682 Set_Instance_Env (Gen_Unit, Formal);
2683 Set_Is_Generic_Instance (Formal);
2685 Enter_Name (Formal);
2686 Set_Ekind (Formal, E_Package);
2687 Set_Etype (Formal, Standard_Void_Type);
2688 Set_Inner_Instances (Formal, New_Elmt_List);
2689 Push_Scope (Formal);
2691 -- Manually set the SPARK_Mode from the context because the package
2692 -- declaration is never analyzed.
2694 Set_SPARK_Pragma (Formal, SPARK_Mode_Pragma);
2695 Set_SPARK_Aux_Pragma (Formal, SPARK_Mode_Pragma);
2696 Set_SPARK_Pragma_Inherited (Formal);
2697 Set_SPARK_Aux_Pragma_Inherited (Formal);
2699 if Is_Child_Unit (Gen_Unit) and then Parent_Installed then
2701 -- Similarly, we have to make the name of the formal visible in the
2702 -- parent instance, to resolve properly fully qualified names that
2703 -- may appear in the generic unit. The parent instance has been
2704 -- placed on the scope stack ahead of the current scope.
2706 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
2709 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
2710 Set_Ekind (Renaming_In_Par, E_Package);
2711 Set_Etype (Renaming_In_Par, Standard_Void_Type);
2712 Set_Scope (Renaming_In_Par, Parent_Instance);
2713 Set_Parent (Renaming_In_Par, Parent (Formal));
2714 Set_Renamed_Object (Renaming_In_Par, Formal);
2715 Append_Entity (Renaming_In_Par, Parent_Instance);
2718 -- A formal package declaration behaves as a package instantiation with
2719 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
2720 -- missing, set the global flag which signals Analyze_Pragma to ingnore
2721 -- all SPARK_Mode pragmas within the generic_package_name.
2723 if SPARK_Mode /= On then
2724 Ignore_Pragma_SPARK_Mode := True;
2727 Analyze (Specification (N));
2729 -- The formals for which associations are provided are not visible
2730 -- outside of the formal package. The others are still declared by a
2731 -- formal parameter declaration.
2733 -- If there are no associations, the only local entity to hide is the
2734 -- generated package renaming itself.
2740 E := First_Entity (Formal);
2741 while Present (E) loop
2742 if Associations and then not Is_Generic_Formal (E) then
2746 if Ekind (E) = E_Package and then Renamed_Entity (E) = Formal then
2755 End_Package_Scope (Formal);
2756 Restore_Hidden_Primitives (Vis_Prims_List);
2758 if Parent_Installed then
2764 -- Inside the generic unit, the formal package is a regular package, but
2765 -- no body is needed for it. Note that after instantiation, the defining
2766 -- unit name we need is in the new tree and not in the original (see
2767 -- Package_Instantiation). A generic formal package is an instance, and
2768 -- can be used as an actual for an inner instance.
2770 Set_Has_Completion (Formal, True);
2772 -- Add semantic information to the original defining identifier for ASIS
2775 Set_Ekind (Pack_Id, E_Package);
2776 Set_Etype (Pack_Id, Standard_Void_Type);
2777 Set_Scope (Pack_Id, Scope (Formal));
2778 Set_Has_Completion (Pack_Id, True);
2781 if Has_Aspects (N) then
2782 Analyze_Aspect_Specifications (N, Pack_Id);
2785 Ignore_Pragma_SPARK_Mode := Save_IPSM;
2786 end Analyze_Formal_Package_Declaration;
2788 ---------------------------------
2789 -- Analyze_Formal_Private_Type --
2790 ---------------------------------
2792 procedure Analyze_Formal_Private_Type
2798 New_Private_Type (N, T, Def);
2800 -- Set the size to an arbitrary but legal value
2802 Set_Size_Info (T, Standard_Integer);
2803 Set_RM_Size (T, RM_Size (Standard_Integer));
2804 end Analyze_Formal_Private_Type;
2806 ------------------------------------
2807 -- Analyze_Formal_Incomplete_Type --
2808 ------------------------------------
2810 procedure Analyze_Formal_Incomplete_Type
2816 Set_Ekind (T, E_Incomplete_Type);
2818 Set_Private_Dependents (T, New_Elmt_List);
2820 if Tagged_Present (Def) then
2821 Set_Is_Tagged_Type (T);
2822 Make_Class_Wide_Type (T);
2823 Set_Direct_Primitive_Operations (T, New_Elmt_List);
2825 end Analyze_Formal_Incomplete_Type;
2827 ----------------------------------------
2828 -- Analyze_Formal_Signed_Integer_Type --
2829 ----------------------------------------
2831 procedure Analyze_Formal_Signed_Integer_Type
2835 Base : constant Entity_Id :=
2837 (E_Signed_Integer_Type,
2839 Sloc (Defining_Identifier (Parent (Def))), 'G');
2844 Set_Ekind (T, E_Signed_Integer_Subtype);
2845 Set_Etype (T, Base);
2846 Set_Size_Info (T, Standard_Integer);
2847 Set_RM_Size (T, RM_Size (Standard_Integer));
2848 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
2849 Set_Is_Constrained (T);
2851 Set_Is_Generic_Type (Base);
2852 Set_Size_Info (Base, Standard_Integer);
2853 Set_RM_Size (Base, RM_Size (Standard_Integer));
2854 Set_Etype (Base, Base);
2855 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
2856 Set_Parent (Base, Parent (Def));
2857 end Analyze_Formal_Signed_Integer_Type;
2859 -------------------------------------------
2860 -- Analyze_Formal_Subprogram_Declaration --
2861 -------------------------------------------
2863 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is
2864 Spec : constant Node_Id := Specification (N);
2865 Def : constant Node_Id := Default_Name (N);
2866 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
2874 if Nkind (Nam) = N_Defining_Program_Unit_Name then
2875 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
2879 Analyze_Subprogram_Declaration (N);
2880 Set_Is_Formal_Subprogram (Nam);
2881 Set_Has_Completion (Nam);
2883 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
2884 Set_Is_Abstract_Subprogram (Nam);
2886 Set_Is_Dispatching_Operation (Nam);
2888 -- A formal abstract procedure cannot have a null default
2889 -- (RM 12.6(4.1/2)).
2891 if Nkind (Spec) = N_Procedure_Specification
2892 and then Null_Present (Spec)
2895 ("a formal abstract subprogram cannot default to null", Spec);
2899 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
2901 if No (Ctrl_Type) then
2903 ("abstract formal subprogram must have a controlling type",
2906 elsif Ada_Version >= Ada_2012
2907 and then Is_Incomplete_Type (Ctrl_Type)
2910 ("controlling type of abstract formal subprogram cannot "
2911 & "be incomplete type", N, Ctrl_Type);
2914 Check_Controlling_Formals (Ctrl_Type, Nam);
2919 -- Default name is resolved at the point of instantiation
2921 if Box_Present (N) then
2924 -- Else default is bound at the point of generic declaration
2926 elsif Present (Def) then
2927 if Nkind (Def) = N_Operator_Symbol then
2928 Find_Direct_Name (Def);
2930 elsif Nkind (Def) /= N_Attribute_Reference then
2934 -- For an attribute reference, analyze the prefix and verify
2935 -- that it has the proper profile for the subprogram.
2937 Analyze (Prefix (Def));
2938 Valid_Default_Attribute (Nam, Def);
2942 -- Default name may be overloaded, in which case the interpretation
2943 -- with the correct profile must be selected, as for a renaming.
2944 -- If the definition is an indexed component, it must denote a
2945 -- member of an entry family. If it is a selected component, it
2946 -- can be a protected operation.
2948 if Etype (Def) = Any_Type then
2951 elsif Nkind (Def) = N_Selected_Component then
2952 if not Is_Overloadable (Entity (Selector_Name (Def))) then
2953 Error_Msg_N ("expect valid subprogram name as default", Def);
2956 elsif Nkind (Def) = N_Indexed_Component then
2957 if Is_Entity_Name (Prefix (Def)) then
2958 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then
2959 Error_Msg_N ("expect valid subprogram name as default", Def);
2962 elsif Nkind (Prefix (Def)) = N_Selected_Component then
2963 if Ekind (Entity (Selector_Name (Prefix (Def)))) /=
2966 Error_Msg_N ("expect valid subprogram name as default", Def);
2970 Error_Msg_N ("expect valid subprogram name as default", Def);
2974 elsif Nkind (Def) = N_Character_Literal then
2976 -- Needs some type checks: subprogram should be parameterless???
2978 Resolve (Def, (Etype (Nam)));
2980 elsif not Is_Entity_Name (Def)
2981 or else not Is_Overloadable (Entity (Def))
2983 Error_Msg_N ("expect valid subprogram name as default", Def);
2986 elsif not Is_Overloaded (Def) then
2987 Subp := Entity (Def);
2990 Error_Msg_N ("premature usage of formal subprogram", Def);
2992 elsif not Entity_Matches_Spec (Subp, Nam) then
2993 Error_Msg_N ("no visible entity matches specification", Def);
2996 -- More than one interpretation, so disambiguate as for a renaming
3001 I1 : Interp_Index := 0;
3007 Get_First_Interp (Def, I, It);
3008 while Present (It.Nam) loop
3009 if Entity_Matches_Spec (It.Nam, Nam) then
3010 if Subp /= Any_Id then
3011 It1 := Disambiguate (Def, I1, I, Etype (Subp));
3013 if It1 = No_Interp then
3014 Error_Msg_N ("ambiguous default subprogram", Def);
3027 Get_Next_Interp (I, It);
3031 if Subp /= Any_Id then
3033 -- Subprogram found, generate reference to it
3035 Set_Entity (Def, Subp);
3036 Generate_Reference (Subp, Def);
3039 Error_Msg_N ("premature usage of formal subprogram", Def);
3041 elsif Ekind (Subp) /= E_Operator then
3042 Check_Mode_Conformant (Subp, Nam);
3046 Error_Msg_N ("no visible subprogram matches specification", N);
3052 if Has_Aspects (N) then
3053 Analyze_Aspect_Specifications (N, Nam);
3056 end Analyze_Formal_Subprogram_Declaration;
3058 -------------------------------------
3059 -- Analyze_Formal_Type_Declaration --
3060 -------------------------------------
3062 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
3063 Def : constant Node_Id := Formal_Type_Definition (N);
3067 T := Defining_Identifier (N);
3069 if Present (Discriminant_Specifications (N))
3070 and then Nkind (Def) /= N_Formal_Private_Type_Definition
3073 ("discriminants not allowed for this formal type", T);
3076 -- Enter the new name, and branch to specific routine
3079 when N_Formal_Private_Type_Definition =>
3080 Analyze_Formal_Private_Type (N, T, Def);
3082 when N_Formal_Derived_Type_Definition =>
3083 Analyze_Formal_Derived_Type (N, T, Def);
3085 when N_Formal_Incomplete_Type_Definition =>
3086 Analyze_Formal_Incomplete_Type (T, Def);
3088 when N_Formal_Discrete_Type_Definition =>
3089 Analyze_Formal_Discrete_Type (T, Def);
3091 when N_Formal_Signed_Integer_Type_Definition =>
3092 Analyze_Formal_Signed_Integer_Type (T, Def);
3094 when N_Formal_Modular_Type_Definition =>
3095 Analyze_Formal_Modular_Type (T, Def);
3097 when N_Formal_Floating_Point_Definition =>
3098 Analyze_Formal_Floating_Type (T, Def);
3100 when N_Formal_Ordinary_Fixed_Point_Definition =>
3101 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
3103 when N_Formal_Decimal_Fixed_Point_Definition =>
3104 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
3106 when N_Array_Type_Definition =>
3107 Analyze_Formal_Array_Type (T, Def);
3109 when N_Access_To_Object_Definition |
3110 N_Access_Function_Definition |
3111 N_Access_Procedure_Definition =>
3112 Analyze_Generic_Access_Type (T, Def);
3114 -- Ada 2005: a interface declaration is encoded as an abstract
3115 -- record declaration or a abstract type derivation.
3117 when N_Record_Definition =>
3118 Analyze_Formal_Interface_Type (N, T, Def);
3120 when N_Derived_Type_Definition =>
3121 Analyze_Formal_Derived_Interface_Type (N, T, Def);
3127 raise Program_Error;
3131 Set_Is_Generic_Type (T);
3133 if Has_Aspects (N) then
3134 Analyze_Aspect_Specifications (N, T);
3136 end Analyze_Formal_Type_Declaration;
3138 ------------------------------------
3139 -- Analyze_Function_Instantiation --
3140 ------------------------------------
3142 procedure Analyze_Function_Instantiation (N : Node_Id) is
3144 Analyze_Subprogram_Instantiation (N, E_Function);
3145 end Analyze_Function_Instantiation;
3147 ---------------------------------
3148 -- Analyze_Generic_Access_Type --
3149 ---------------------------------
3151 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
3155 if Nkind (Def) = N_Access_To_Object_Definition then
3156 Access_Type_Declaration (T, Def);
3158 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
3159 and then No (Full_View (Designated_Type (T)))
3160 and then not Is_Generic_Type (Designated_Type (T))
3162 Error_Msg_N ("premature usage of incomplete type", Def);
3164 elsif not Is_Entity_Name (Subtype_Indication (Def)) then
3166 ("only a subtype mark is allowed in a formal", Def);
3170 Access_Subprogram_Declaration (T, Def);
3172 end Analyze_Generic_Access_Type;
3174 ---------------------------------
3175 -- Analyze_Generic_Formal_Part --
3176 ---------------------------------
3178 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
3179 Gen_Parm_Decl : Node_Id;
3182 -- The generic formals are processed in the scope of the generic unit,
3183 -- where they are immediately visible. The scope is installed by the
3186 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
3187 while Present (Gen_Parm_Decl) loop
3188 Analyze (Gen_Parm_Decl);
3189 Next (Gen_Parm_Decl);
3192 Generate_Reference_To_Generic_Formals (Current_Scope);
3193 end Analyze_Generic_Formal_Part;
3195 ------------------------------------------
3196 -- Analyze_Generic_Package_Declaration --
3197 ------------------------------------------
3199 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
3200 Loc : constant Source_Ptr := Sloc (N);
3201 Decls : constant List_Id :=
3202 Visible_Declarations (Specification (N));
3207 Save_Parent : Node_Id;
3210 Check_SPARK_05_Restriction ("generic is not allowed", N);
3212 -- We introduce a renaming of the enclosing package, to have a usable
3213 -- entity as the prefix of an expanded name for a local entity of the
3214 -- form Par.P.Q, where P is the generic package. This is because a local
3215 -- entity named P may hide it, so that the usual visibility rules in
3216 -- the instance will not resolve properly.
3219 Make_Package_Renaming_Declaration (Loc,
3220 Defining_Unit_Name =>
3221 Make_Defining_Identifier (Loc,
3222 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
3224 Make_Identifier (Loc, Chars (Defining_Entity (N))));
3226 if Present (Decls) then
3227 Decl := First (Decls);
3228 while Present (Decl) and then Nkind (Decl) = N_Pragma loop
3232 if Present (Decl) then
3233 Insert_Before (Decl, Renaming);
3235 Append (Renaming, Visible_Declarations (Specification (N)));
3239 Set_Visible_Declarations (Specification (N), New_List (Renaming));
3242 -- Create copy of generic unit, and save for instantiation. If the unit
3243 -- is a child unit, do not copy the specifications for the parent, which
3244 -- are not part of the generic tree.
3246 Save_Parent := Parent_Spec (N);
3247 Set_Parent_Spec (N, Empty);
3249 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3250 Set_Parent_Spec (New_N, Save_Parent);
3253 -- Once the contents of the generic copy and the template are swapped,
3254 -- do the same for their respective aspect specifications.
3256 Exchange_Aspects (N, New_N);
3258 -- Collect all contract-related source pragmas found within the template
3259 -- and attach them to the contract of the package spec. This contract is
3260 -- used in the capture of global references within annotations.
3262 Create_Generic_Contract (N);
3264 Id := Defining_Entity (N);
3265 Generate_Definition (Id);
3267 -- Expansion is not applied to generic units
3272 Set_Ekind (Id, E_Generic_Package);
3273 Set_Etype (Id, Standard_Void_Type);
3275 -- A generic package declared within a Ghost region is rendered Ghost
3276 -- (SPARK RM 6.9(2)).
3278 if Ghost_Mode > None then
3279 Set_Is_Ghost_Entity (Id);
3282 -- Analyze aspects now, so that generated pragmas appear in the
3283 -- declarations before building and analyzing the generic copy.
3285 if Has_Aspects (N) then
3286 Analyze_Aspect_Specifications (N, Id);
3290 Enter_Generic_Scope (Id);
3291 Set_Inner_Instances (Id, New_Elmt_List);
3293 Set_Categorization_From_Pragmas (N);
3294 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3296 -- Link the declaration of the generic homonym in the generic copy to
3297 -- the package it renames, so that it is always resolved properly.
3299 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
3300 Set_Entity (Associated_Node (Name (Renaming)), Id);
3302 -- For a library unit, we have reconstructed the entity for the unit,
3303 -- and must reset it in the library tables.
3305 if Nkind (Parent (N)) = N_Compilation_Unit then
3306 Set_Cunit_Entity (Current_Sem_Unit, Id);
3309 Analyze_Generic_Formal_Part (N);
3311 -- After processing the generic formals, analysis proceeds as for a
3312 -- non-generic package.
3314 Analyze (Specification (N));
3316 Validate_Categorization_Dependency (N, Id);
3320 End_Package_Scope (Id);
3321 Exit_Generic_Scope (Id);
3323 if Nkind (Parent (N)) /= N_Compilation_Unit then
3324 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
3325 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
3326 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
3329 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3330 Validate_RT_RAT_Component (N);
3332 -- If this is a spec without a body, check that generic parameters
3335 if not Body_Required (Parent (N)) then
3336 Check_References (Id);
3340 -- If there is a specified storage pool in the context, create an
3341 -- aspect on the package declaration, so that it is used in any
3342 -- instance that does not override it.
3344 if Present (Default_Pool) then
3350 Make_Aspect_Specification (Loc,
3351 Identifier => Make_Identifier (Loc, Name_Default_Storage_Pool),
3352 Expression => New_Copy (Default_Pool));
3354 if No (Aspect_Specifications (Specification (N))) then
3355 Set_Aspect_Specifications (Specification (N), New_List (ASN));
3357 Append (ASN, Aspect_Specifications (Specification (N)));
3361 end Analyze_Generic_Package_Declaration;
3363 --------------------------------------------
3364 -- Analyze_Generic_Subprogram_Declaration --
3365 --------------------------------------------
3367 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
3371 Result_Type : Entity_Id;
3372 Save_Parent : Node_Id;
3377 Check_SPARK_05_Restriction ("generic is not allowed", N);
3379 -- Create copy of generic unit, and save for instantiation. If the unit
3380 -- is a child unit, do not copy the specifications for the parent, which
3381 -- are not part of the generic tree.
3383 Save_Parent := Parent_Spec (N);
3384 Set_Parent_Spec (N, Empty);
3386 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
3387 Set_Parent_Spec (New_N, Save_Parent);
3390 -- Once the contents of the generic copy and the template are swapped,
3391 -- do the same for their respective aspect specifications.
3393 Exchange_Aspects (N, New_N);
3395 -- Collect all contract-related source pragmas found within the template
3396 -- and attach them to the contract of the subprogram spec. This contract
3397 -- is used in the capture of global references within annotations.
3399 Create_Generic_Contract (N);
3401 Spec := Specification (N);
3402 Id := Defining_Entity (Spec);
3403 Generate_Definition (Id);
3405 if Nkind (Id) = N_Defining_Operator_Symbol then
3407 ("operator symbol not allowed for generic subprogram", Id);
3413 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
3415 -- Analyze the aspects of the generic copy to ensure that all generated
3416 -- pragmas (if any) perform their semantic effects.
3418 if Has_Aspects (N) then
3419 Analyze_Aspect_Specifications (N, Id);
3423 Enter_Generic_Scope (Id);
3424 Set_Inner_Instances (Id, New_Elmt_List);
3425 Set_Is_Pure (Id, Is_Pure (Current_Scope));
3427 Analyze_Generic_Formal_Part (N);
3429 Formals := Parameter_Specifications (Spec);
3431 if Nkind (Spec) = N_Function_Specification then
3432 Set_Ekind (Id, E_Generic_Function);
3434 Set_Ekind (Id, E_Generic_Procedure);
3437 if Present (Formals) then
3438 Process_Formals (Formals, Spec);
3441 if Nkind (Spec) = N_Function_Specification then
3442 if Nkind (Result_Definition (Spec)) = N_Access_Definition then
3443 Result_Type := Access_Definition (Spec, Result_Definition (Spec));
3444 Set_Etype (Id, Result_Type);
3446 -- Check restriction imposed by AI05-073: a generic function
3447 -- cannot return an abstract type or an access to such.
3449 -- This is a binding interpretation should it apply to earlier
3450 -- versions of Ada as well as Ada 2012???
3452 if Is_Abstract_Type (Designated_Type (Result_Type))
3453 and then Ada_Version >= Ada_2012
3456 ("generic function cannot have an access result "
3457 & "that designates an abstract type", Spec);
3461 Find_Type (Result_Definition (Spec));
3462 Typ := Entity (Result_Definition (Spec));
3464 if Is_Abstract_Type (Typ)
3465 and then Ada_Version >= Ada_2012
3468 ("generic function cannot have abstract result type", Spec);
3471 -- If a null exclusion is imposed on the result type, then create
3472 -- a null-excluding itype (an access subtype) and use it as the
3473 -- function's Etype.
3475 if Is_Access_Type (Typ)
3476 and then Null_Exclusion_Present (Spec)
3479 Create_Null_Excluding_Itype
3481 Related_Nod => Spec,
3482 Scope_Id => Defining_Unit_Name (Spec)));
3484 Set_Etype (Id, Typ);
3489 Set_Etype (Id, Standard_Void_Type);
3492 -- A generic subprogram declared within a Ghost region is rendered Ghost
3493 -- (SPARK RM 6.9(2)).
3495 if Ghost_Mode > None then
3496 Set_Is_Ghost_Entity (Id);
3499 -- For a library unit, we have reconstructed the entity for the unit,
3500 -- and must reset it in the library tables. We also make sure that
3501 -- Body_Required is set properly in the original compilation unit node.
3503 if Nkind (Parent (N)) = N_Compilation_Unit then
3504 Set_Cunit_Entity (Current_Sem_Unit, Id);
3505 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
3508 Set_Categorization_From_Pragmas (N);
3509 Validate_Categorization_Dependency (N, Id);
3511 -- Capture all global references that occur within the profile of the
3512 -- generic subprogram. Aspects are not part of this processing because
3513 -- they must be delayed. If processed now, Save_Global_References will
3514 -- destroy the Associated_Node links and prevent the capture of global
3515 -- references when the contract of the generic subprogram is analyzed.
3517 Save_Global_References (Original_Node (N));
3521 Exit_Generic_Scope (Id);
3522 Generate_Reference_To_Formals (Id);
3524 List_Inherited_Pre_Post_Aspects (Id);
3525 end Analyze_Generic_Subprogram_Declaration;
3527 -----------------------------------
3528 -- Analyze_Package_Instantiation --
3529 -----------------------------------
3531 procedure Analyze_Package_Instantiation (N : Node_Id) is
3532 Loc : constant Source_Ptr := Sloc (N);
3533 Gen_Id : constant Node_Id := Name (N);
3536 Act_Decl_Name : Node_Id;
3537 Act_Decl_Id : Entity_Id;
3543 Gen_Unit : Entity_Id;
3545 Is_Actual_Pack : constant Boolean :=
3546 Is_Internal (Defining_Entity (N));
3548 Env_Installed : Boolean := False;
3549 Parent_Installed : Boolean := False;
3550 Renaming_List : List_Id;
3551 Unit_Renaming : Node_Id;
3552 Needs_Body : Boolean;
3553 Inline_Now : Boolean := False;
3554 Has_Inline_Always : Boolean := False;
3556 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode;
3557 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
3559 Save_SM : constant SPARK_Mode_Type := SPARK_Mode;
3560 Save_SMP : constant Node_Id := SPARK_Mode_Pragma;
3561 -- Save the SPARK_Mode-related data for restore on exit
3563 Save_Style_Check : constant Boolean := Style_Check;
3564 -- Save style check mode for restore on exit
3566 procedure Delay_Descriptors (E : Entity_Id);
3567 -- Delay generation of subprogram descriptors for given entity
3569 function Might_Inline_Subp return Boolean;
3570 -- If inlining is active and the generic contains inlined subprograms,
3571 -- we instantiate the body. This may cause superfluous instantiations,
3572 -- but it is simpler than detecting the need for the body at the point
3573 -- of inlining, when the context of the instance is not available.
3575 -----------------------
3576 -- Delay_Descriptors --
3577 -----------------------
3579 procedure Delay_Descriptors (E : Entity_Id) is
3581 if not Delay_Subprogram_Descriptors (E) then
3582 Set_Delay_Subprogram_Descriptors (E);
3583 Pending_Descriptor.Append (E);
3585 end Delay_Descriptors;
3587 -----------------------
3588 -- Might_Inline_Subp --
3589 -----------------------
3591 function Might_Inline_Subp return Boolean is
3595 if not Inline_Processing_Required then
3599 E := First_Entity (Gen_Unit);
3600 while Present (E) loop
3601 if Is_Subprogram (E) and then Is_Inlined (E) then
3602 -- Remember if there are any subprograms with Inline_Always
3604 if Has_Pragma_Inline_Always (E) then
3605 Has_Inline_Always := True;
3616 end Might_Inline_Subp;
3618 -- Local declarations
3620 Vis_Prims_List : Elist_Id := No_Elist;
3621 -- List of primitives made temporarily visible in the instantiation
3622 -- to match the visibility of the formal type
3624 -- Start of processing for Analyze_Package_Instantiation
3627 Check_SPARK_05_Restriction ("generic is not allowed", N);
3629 -- Very first thing: check for Text_IO special unit in case we are
3630 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
3632 Check_Text_IO_Special_Unit (Name (N));
3634 -- Make node global for error reporting
3636 Instantiation_Node := N;
3638 -- Turn off style checking in instances. If the check is enabled on the
3639 -- generic unit, a warning in an instance would just be noise. If not
3640 -- enabled on the generic, then a warning in an instance is just wrong.
3642 Style_Check := False;
3644 -- Case of instantiation of a generic package
3646 if Nkind (N) = N_Package_Instantiation then
3647 Act_Decl_Id := New_Copy (Defining_Entity (N));
3648 Set_Comes_From_Source (Act_Decl_Id, True);
3650 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
3652 Make_Defining_Program_Unit_Name (Loc,
3654 New_Copy_Tree (Name (Defining_Unit_Name (N))),
3655 Defining_Identifier => Act_Decl_Id);
3657 Act_Decl_Name := Act_Decl_Id;
3660 -- Case of instantiation of a formal package
3663 Act_Decl_Id := Defining_Identifier (N);
3664 Act_Decl_Name := Act_Decl_Id;
3667 Generate_Definition (Act_Decl_Id);
3668 Set_Ekind (Act_Decl_Id, E_Package);
3670 -- Initialize list of incomplete actuals before analysis
3672 Set_Incomplete_Actuals (Act_Decl_Id, New_Elmt_List);
3674 Preanalyze_Actuals (N, Act_Decl_Id);
3677 Env_Installed := True;
3679 -- Reset renaming map for formal types. The mapping is established
3680 -- when analyzing the generic associations, but some mappings are
3681 -- inherited from formal packages of parent units, and these are
3682 -- constructed when the parents are installed.
3684 Generic_Renamings.Set_Last (0);
3685 Generic_Renamings_HTable.Reset;
3687 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3688 Gen_Unit := Entity (Gen_Id);
3690 -- Verify that it is the name of a generic package
3692 -- A visibility glitch: if the instance is a child unit and the generic
3693 -- is the generic unit of a parent instance (i.e. both the parent and
3694 -- the child units are instances of the same package) the name now
3695 -- denotes the renaming within the parent, not the intended generic
3696 -- unit. See if there is a homonym that is the desired generic. The
3697 -- renaming declaration must be visible inside the instance of the
3698 -- child, but not when analyzing the name in the instantiation itself.
3700 if Ekind (Gen_Unit) = E_Package
3701 and then Present (Renamed_Entity (Gen_Unit))
3702 and then In_Open_Scopes (Renamed_Entity (Gen_Unit))
3703 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit))
3704 and then Present (Homonym (Gen_Unit))
3706 Gen_Unit := Homonym (Gen_Unit);
3709 if Etype (Gen_Unit) = Any_Type then
3713 elsif Ekind (Gen_Unit) /= E_Generic_Package then
3715 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3717 if From_Limited_With (Gen_Unit) then
3719 ("cannot instantiate a limited withed package", Gen_Id);
3722 ("& is not the name of a generic package", Gen_Id, Gen_Unit);
3729 if In_Extended_Main_Source_Unit (N) then
3730 Set_Is_Instantiated (Gen_Unit);
3731 Generate_Reference (Gen_Unit, N);
3733 if Present (Renamed_Object (Gen_Unit)) then
3734 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
3735 Generate_Reference (Renamed_Object (Gen_Unit), N);
3739 if Nkind (Gen_Id) = N_Identifier
3740 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3743 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3745 elsif Nkind (Gen_Id) = N_Expanded_Name
3746 and then Is_Child_Unit (Gen_Unit)
3747 and then Nkind (Prefix (Gen_Id)) = N_Identifier
3748 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
3751 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
3754 Set_Entity (Gen_Id, Gen_Unit);
3756 -- If generic is a renaming, get original generic unit
3758 if Present (Renamed_Object (Gen_Unit))
3759 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
3761 Gen_Unit := Renamed_Object (Gen_Unit);
3764 -- Verify that there are no circular instantiations
3766 if In_Open_Scopes (Gen_Unit) then
3767 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3771 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3772 Error_Msg_Node_2 := Current_Scope;
3774 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3775 Circularity_Detected := True;
3780 -- If the context of the instance is subject to SPARK_Mode "off" or
3781 -- the annotation is altogether missing, set the global flag which
3782 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
3785 if SPARK_Mode /= On then
3786 Ignore_Pragma_SPARK_Mode := True;
3789 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3790 Gen_Spec := Specification (Gen_Decl);
3792 -- Initialize renamings map, for error checking, and the list that
3793 -- holds private entities whose views have changed between generic
3794 -- definition and instantiation. If this is the instance created to
3795 -- validate an actual package, the instantiation environment is that
3796 -- of the enclosing instance.
3798 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
3800 -- Copy original generic tree, to produce text for instantiation
3804 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3806 Act_Spec := Specification (Act_Tree);
3808 -- If this is the instance created to validate an actual package,
3809 -- only the formals matter, do not examine the package spec itself.
3811 if Is_Actual_Pack then
3812 Set_Visible_Declarations (Act_Spec, New_List);
3813 Set_Private_Declarations (Act_Spec, New_List);
3817 Analyze_Associations
3819 Formals => Generic_Formal_Declarations (Act_Tree),
3820 F_Copy => Generic_Formal_Declarations (Gen_Decl));
3822 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
3824 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
3825 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
3826 Set_Is_Generic_Instance (Act_Decl_Id);
3827 Set_Generic_Parent (Act_Spec, Gen_Unit);
3829 -- References to the generic in its own declaration or its body are
3830 -- references to the instance. Add a renaming declaration for the
3831 -- generic unit itself. This declaration, as well as the renaming
3832 -- declarations for the generic formals, must remain private to the
3833 -- unit: the formals, because this is the language semantics, and
3834 -- the unit because its use is an artifact of the implementation.
3837 Make_Package_Renaming_Declaration (Loc,
3838 Defining_Unit_Name =>
3839 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
3840 Name => New_Occurrence_Of (Act_Decl_Id, Loc));
3842 Append (Unit_Renaming, Renaming_List);
3844 -- The renaming declarations are the first local declarations of the
3847 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
3849 (First (Visible_Declarations (Act_Spec)), Renaming_List);
3851 Set_Visible_Declarations (Act_Spec, Renaming_List);
3854 Act_Decl := Make_Package_Declaration (Loc, Specification => Act_Spec);
3856 -- Propagate the aspect specifications from the package declaration
3857 -- template to the instantiated version of the package declaration.
3859 if Has_Aspects (Act_Tree) then
3860 Set_Aspect_Specifications (Act_Decl,
3861 New_Copy_List_Tree (Aspect_Specifications (Act_Tree)));
3864 -- The generic may have a generated Default_Storage_Pool aspect,
3865 -- set at the point of generic declaration. If the instance has
3866 -- that aspect, it overrides the one inherited from the generic.
3868 if Has_Aspects (Gen_Spec) then
3869 if No (Aspect_Specifications (N)) then
3870 Set_Aspect_Specifications (N,
3872 (Aspect_Specifications (Gen_Spec))));
3876 ASN1, ASN2 : Node_Id;
3879 ASN1 := First (Aspect_Specifications (N));
3880 while Present (ASN1) loop
3881 if Chars (Identifier (ASN1)) = Name_Default_Storage_Pool
3883 -- If generic carries a default storage pool, remove
3884 -- it in favor of the instance one.
3886 ASN2 := First (Aspect_Specifications (Gen_Spec));
3887 while Present (ASN2) loop
3888 if Chars (Identifier (ASN2)) =
3889 Name_Default_Storage_Pool
3902 Prepend_List_To (Aspect_Specifications (N),
3904 (Aspect_Specifications (Gen_Spec))));
3909 -- Save the instantiation node, for subsequent instantiation of the
3910 -- body, if there is one and we are generating code for the current
3911 -- unit. Mark unit as having a body (avoids premature error message).
3913 -- We instantiate the body if we are generating code, if we are
3914 -- generating cross-reference information, or if we are building
3915 -- trees for ASIS use or GNATprove use.
3918 Enclosing_Body_Present : Boolean := False;
3919 -- If the generic unit is not a compilation unit, then a body may
3920 -- be present in its parent even if none is required. We create a
3921 -- tentative pending instantiation for the body, which will be
3922 -- discarded if none is actually present.
3927 if Scope (Gen_Unit) /= Standard_Standard
3928 and then not Is_Child_Unit (Gen_Unit)
3930 Scop := Scope (Gen_Unit);
3931 while Present (Scop) and then Scop /= Standard_Standard loop
3932 if Unit_Requires_Body (Scop) then
3933 Enclosing_Body_Present := True;
3936 elsif In_Open_Scopes (Scop)
3937 and then In_Package_Body (Scop)
3939 Enclosing_Body_Present := True;
3943 exit when Is_Compilation_Unit (Scop);
3944 Scop := Scope (Scop);
3948 -- If front-end inlining is enabled or there are any subprograms
3949 -- marked with Inline_Always, and this is a unit for which code
3950 -- will be generated, we instantiate the body at once.
3952 -- This is done if the instance is not the main unit, and if the
3953 -- generic is not a child unit of another generic, to avoid scope
3954 -- problems and the reinstallation of parent instances.
3957 and then (not Is_Child_Unit (Gen_Unit)
3958 or else not Is_Generic_Unit (Scope (Gen_Unit)))
3959 and then Might_Inline_Subp
3960 and then not Is_Actual_Pack
3962 if not Back_End_Inlining
3963 and then (Front_End_Inlining or else Has_Inline_Always)
3964 and then (Is_In_Main_Unit (N)
3965 or else In_Main_Context (Current_Scope))
3966 and then Nkind (Parent (N)) /= N_Compilation_Unit
3970 -- In configurable_run_time mode we force the inlining of
3971 -- predefined subprograms marked Inline_Always, to minimize
3972 -- the use of the run-time library.
3974 elsif Is_Predefined_File_Name
3975 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
3976 and then Configurable_Run_Time_Mode
3977 and then Nkind (Parent (N)) /= N_Compilation_Unit
3982 -- If the current scope is itself an instance within a child
3983 -- unit, there will be duplications in the scope stack, and the
3984 -- unstacking mechanism in Inline_Instance_Body will fail.
3985 -- This loses some rare cases of optimization, and might be
3986 -- improved some day, if we can find a proper abstraction for
3987 -- "the complete compilation context" that can be saved and
3990 if Is_Generic_Instance (Current_Scope) then
3992 Curr_Unit : constant Entity_Id :=
3993 Cunit_Entity (Current_Sem_Unit);
3995 if Curr_Unit /= Current_Scope
3996 and then Is_Child_Unit (Curr_Unit)
3998 Inline_Now := False;
4005 (Unit_Requires_Body (Gen_Unit)
4006 or else Enclosing_Body_Present
4007 or else Present (Corresponding_Body (Gen_Decl)))
4008 and then (Is_In_Main_Unit (N) or else Might_Inline_Subp)
4009 and then not Is_Actual_Pack
4010 and then not Inline_Now
4011 and then (Operating_Mode = Generate_Code
4013 -- Need comment for this check ???
4015 or else (Operating_Mode = Check_Semantics
4016 and then (ASIS_Mode or GNATprove_Mode)));
4018 -- If front-end inlining is enabled or there are any subprograms
4019 -- marked with Inline_Always, do not instantiate body when within
4020 -- a generic context.
4022 if ((Front_End_Inlining or else Has_Inline_Always)
4023 and then not Expander_Active)
4024 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
4026 Needs_Body := False;
4029 -- If the current context is generic, and the package being
4030 -- instantiated is declared within a formal package, there is no
4031 -- body to instantiate until the enclosing generic is instantiated
4032 -- and there is an actual for the formal package. If the formal
4033 -- package has parameters, we build a regular package instance for
4034 -- it, that precedes the original formal package declaration.
4036 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
4038 Decl : constant Node_Id :=
4040 (Unit_Declaration_Node (Scope (Gen_Unit)));
4042 if Nkind (Decl) = N_Formal_Package_Declaration
4043 or else (Nkind (Decl) = N_Package_Declaration
4044 and then Is_List_Member (Decl)
4045 and then Present (Next (Decl))
4047 Nkind (Next (Decl)) =
4048 N_Formal_Package_Declaration)
4050 Needs_Body := False;
4056 -- For RCI unit calling stubs, we omit the instance body if the
4057 -- instance is the RCI library unit itself.
4059 -- However there is a special case for nested instances: in this case
4060 -- we do generate the instance body, as it might be required, e.g.
4061 -- because it provides stream attributes for some type used in the
4062 -- profile of a remote subprogram. This is consistent with 12.3(12),
4063 -- which indicates that the instance body occurs at the place of the
4064 -- instantiation, and thus is part of the RCI declaration, which is
4065 -- present on all client partitions (this is E.2.3(18)).
4067 -- Note that AI12-0002 may make it illegal at some point to have
4068 -- stream attributes defined in an RCI unit, in which case this
4069 -- special case will become unnecessary. In the meantime, there
4070 -- is known application code in production that depends on this
4071 -- being possible, so we definitely cannot eliminate the body in
4072 -- the case of nested instances for the time being.
4074 -- When we generate a nested instance body, calling stubs for any
4075 -- relevant subprogram will be be inserted immediately after the
4076 -- subprogram declarations, and will take precedence over the
4077 -- subsequent (original) body. (The stub and original body will be
4078 -- complete homographs, but this is permitted in an instance).
4079 -- (Could we do better and remove the original body???)
4081 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
4082 and then Comes_From_Source (N)
4083 and then Nkind (Parent (N)) = N_Compilation_Unit
4085 Needs_Body := False;
4090 -- Here is a defence against a ludicrous number of instantiations
4091 -- caused by a circular set of instantiation attempts.
4093 if Pending_Instantiations.Last > Maximum_Instantiations then
4094 Error_Msg_Uint_1 := UI_From_Int (Maximum_Instantiations);
4095 Error_Msg_N ("too many instantiations, exceeds max of^", N);
4096 Error_Msg_N ("\limit can be changed using -gnateinn switch", N);
4097 raise Unrecoverable_Error;
4100 -- Indicate that the enclosing scopes contain an instantiation,
4101 -- and that cleanup actions should be delayed until after the
4102 -- instance body is expanded.
4104 Check_Forward_Instantiation (Gen_Decl);
4105 if Nkind (N) = N_Package_Instantiation then
4107 Enclosing_Master : Entity_Id;
4110 -- Loop to search enclosing masters
4112 Enclosing_Master := Current_Scope;
4113 Scope_Loop : while Enclosing_Master /= Standard_Standard loop
4114 if Ekind (Enclosing_Master) = E_Package then
4115 if Is_Compilation_Unit (Enclosing_Master) then
4116 if In_Package_Body (Enclosing_Master) then
4118 (Body_Entity (Enclosing_Master));
4127 Enclosing_Master := Scope (Enclosing_Master);
4130 elsif Is_Generic_Unit (Enclosing_Master)
4131 or else Ekind (Enclosing_Master) = E_Void
4133 -- Cleanup actions will eventually be performed on the
4134 -- enclosing subprogram or package instance, if any.
4135 -- Enclosing scope is void in the formal part of a
4136 -- generic subprogram.
4141 if Ekind (Enclosing_Master) = E_Entry
4143 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
4145 if not Expander_Active then
4149 Protected_Body_Subprogram (Enclosing_Master);
4153 Set_Delay_Cleanups (Enclosing_Master);
4155 while Ekind (Enclosing_Master) = E_Block loop
4156 Enclosing_Master := Scope (Enclosing_Master);
4159 if Is_Subprogram (Enclosing_Master) then
4160 Delay_Descriptors (Enclosing_Master);
4162 elsif Is_Task_Type (Enclosing_Master) then
4164 TBP : constant Node_Id :=
4165 Get_Task_Body_Procedure
4168 if Present (TBP) then
4169 Delay_Descriptors (TBP);
4170 Set_Delay_Cleanups (TBP);
4177 end loop Scope_Loop;
4180 -- Make entry in table
4182 Add_Pending_Instantiation (N, Act_Decl);
4186 Set_Categorization_From_Pragmas (Act_Decl);
4188 if Parent_Installed then
4192 Set_Instance_Spec (N, Act_Decl);
4194 -- If not a compilation unit, insert the package declaration before
4195 -- the original instantiation node.
4197 if Nkind (Parent (N)) /= N_Compilation_Unit then
4198 Mark_Rewrite_Insertion (Act_Decl);
4199 Insert_Before (N, Act_Decl);
4201 if Has_Aspects (N) then
4202 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4204 -- The pragma created for a Default_Storage_Pool aspect must
4205 -- appear ahead of the declarations in the instance spec.
4206 -- Analysis has placed it after the instance node, so remove
4207 -- it and reinsert it properly now.
4210 ASN : constant Node_Id := First (Aspect_Specifications (N));
4211 A_Name : constant Name_Id := Chars (Identifier (ASN));
4215 if A_Name = Name_Default_Storage_Pool then
4216 if No (Visible_Declarations (Act_Spec)) then
4217 Set_Visible_Declarations (Act_Spec, New_List);
4221 while Present (Decl) loop
4222 if Nkind (Decl) = N_Pragma then
4224 Prepend (Decl, Visible_Declarations (Act_Spec));
4236 -- For an instantiation that is a compilation unit, place
4237 -- declaration on current node so context is complete for analysis
4238 -- (including nested instantiations). If this is the main unit,
4239 -- the declaration eventually replaces the instantiation node.
4240 -- If the instance body is created later, it replaces the
4241 -- instance node, and the declaration is attached to it
4242 -- (see Build_Instance_Compilation_Unit_Nodes).
4245 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
4247 -- The entity for the current unit is the newly created one,
4248 -- and all semantic information is attached to it.
4250 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
4252 -- If this is the main unit, replace the main entity as well
4254 if Current_Sem_Unit = Main_Unit then
4255 Main_Unit_Entity := Act_Decl_Id;
4259 Set_Unit (Parent (N), Act_Decl);
4260 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
4261 Set_Package_Instantiation (Act_Decl_Id, N);
4263 -- Process aspect specifications of the instance node, if any, to
4264 -- take into account categorization pragmas before analyzing the
4267 if Has_Aspects (N) then
4268 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4272 Set_Unit (Parent (N), N);
4273 Set_Body_Required (Parent (N), False);
4275 -- We never need elaboration checks on instantiations, since by
4276 -- definition, the body instantiation is elaborated at the same
4277 -- time as the spec instantiation.
4279 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4280 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4283 Check_Elab_Instantiation (N);
4285 if ABE_Is_Certain (N) and then Needs_Body then
4286 Pending_Instantiations.Decrement_Last;
4289 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
4291 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
4292 First_Private_Entity (Act_Decl_Id));
4294 -- If the instantiation will receive a body, the unit will be
4295 -- transformed into a package body, and receive its own elaboration
4296 -- entity. Otherwise, the nature of the unit is now a package
4299 if Nkind (Parent (N)) = N_Compilation_Unit
4300 and then not Needs_Body
4302 Rewrite (N, Act_Decl);
4305 if Present (Corresponding_Body (Gen_Decl))
4306 or else Unit_Requires_Body (Gen_Unit)
4308 Set_Has_Completion (Act_Decl_Id);
4311 Check_Formal_Packages (Act_Decl_Id);
4313 Restore_Hidden_Primitives (Vis_Prims_List);
4314 Restore_Private_Views (Act_Decl_Id);
4316 Inherit_Context (Gen_Decl, N);
4318 if Parent_Installed then
4323 Env_Installed := False;
4326 Validate_Categorization_Dependency (N, Act_Decl_Id);
4328 -- There used to be a check here to prevent instantiations in local
4329 -- contexts if the No_Local_Allocators restriction was active. This
4330 -- check was removed by a binding interpretation in AI-95-00130/07,
4331 -- but we retain the code for documentation purposes.
4333 -- if Ekind (Act_Decl_Id) /= E_Void
4334 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4336 -- Check_Restriction (No_Local_Allocators, N);
4340 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
4343 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4344 -- be used as defining identifiers for a formal package and for the
4345 -- corresponding expanded package.
4347 if Nkind (N) = N_Formal_Package_Declaration then
4348 Act_Decl_Id := New_Copy (Defining_Entity (N));
4349 Set_Comes_From_Source (Act_Decl_Id, True);
4350 Set_Is_Generic_Instance (Act_Decl_Id, False);
4351 Set_Defining_Identifier (N, Act_Decl_Id);
4354 Ignore_Pragma_SPARK_Mode := Save_IPSM;
4355 SPARK_Mode := Save_SM;
4356 SPARK_Mode_Pragma := Save_SMP;
4357 Style_Check := Save_Style_Check;
4359 -- Check that if N is an instantiation of System.Dim_Float_IO or
4360 -- System.Dim_Integer_IO, the formal type has a dimension system.
4362 if Nkind (N) = N_Package_Instantiation
4363 and then Is_Dim_IO_Package_Instantiation (N)
4366 Assoc : constant Node_Id := First (Generic_Associations (N));
4368 if not Has_Dimension_System
4369 (Etype (Explicit_Generic_Actual_Parameter (Assoc)))
4371 Error_Msg_N ("type with a dimension system expected", Assoc);
4377 if Has_Aspects (N) and then Nkind (Parent (N)) /= N_Compilation_Unit then
4378 Analyze_Aspect_Specifications (N, Act_Decl_Id);
4382 when Instantiation_Error =>
4383 if Parent_Installed then
4387 if Env_Installed then
4391 Ignore_Pragma_SPARK_Mode := Save_IPSM;
4392 SPARK_Mode := Save_SM;
4393 SPARK_Mode_Pragma := Save_SMP;
4394 Style_Check := Save_Style_Check;
4395 end Analyze_Package_Instantiation;
4397 --------------------------
4398 -- Inline_Instance_Body --
4399 --------------------------
4401 procedure Inline_Instance_Body
4403 Gen_Unit : Entity_Id;
4406 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
4407 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
4408 Gen_Comp : constant Entity_Id :=
4409 Cunit_Entity (Get_Source_Unit (Gen_Unit));
4411 Save_SM : constant SPARK_Mode_Type := SPARK_Mode;
4412 Save_SMP : constant Node_Id := SPARK_Mode_Pragma;
4413 -- Save all SPARK_Mode-related attributes as removing enclosing scopes
4414 -- to provide a clean environment for analysis of the inlined body will
4415 -- eliminate any previously set SPARK_Mode.
4417 Scope_Stack_Depth : constant Pos :=
4418 Scope_Stack.Last - Scope_Stack.First + 1;
4420 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id;
4421 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id;
4422 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id;
4423 Curr_Scope : Entity_Id := Empty;
4425 Num_Inner : Nat := 0;
4426 Num_Scopes : Nat := 0;
4427 N_Instances : Nat := 0;
4428 Removed : Boolean := False;
4433 -- Case of generic unit defined in another unit. We must remove the
4434 -- complete context of the current unit to install that of the generic.
4436 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
4438 -- Add some comments for the following two loops ???
4441 while Present (S) and then S /= Standard_Standard loop
4443 Num_Scopes := Num_Scopes + 1;
4445 Use_Clauses (Num_Scopes) :=
4447 (Scope_Stack.Last - Num_Scopes + 1).
4449 End_Use_Clauses (Use_Clauses (Num_Scopes));
4451 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First
4452 or else Scope_Stack.Table
4453 (Scope_Stack.Last - Num_Scopes).Entity = Scope (S);
4456 exit when Is_Generic_Instance (S)
4457 and then (In_Package_Body (S)
4458 or else Ekind (S) = E_Procedure
4459 or else Ekind (S) = E_Function);
4463 Vis := Is_Immediately_Visible (Gen_Comp);
4465 -- Find and save all enclosing instances
4470 and then S /= Standard_Standard
4472 if Is_Generic_Instance (S) then
4473 N_Instances := N_Instances + 1;
4474 Instances (N_Instances) := S;
4476 exit when In_Package_Body (S);
4482 -- Remove context of current compilation unit, unless we are within a
4483 -- nested package instantiation, in which case the context has been
4484 -- removed previously.
4486 -- If current scope is the body of a child unit, remove context of
4487 -- spec as well. If an enclosing scope is an instance body, the
4488 -- context has already been removed, but the entities in the body
4489 -- must be made invisible as well.
4492 while Present (S) and then S /= Standard_Standard loop
4493 if Is_Generic_Instance (S)
4494 and then (In_Package_Body (S)
4495 or else Ekind_In (S, E_Procedure, E_Function))
4497 -- We still have to remove the entities of the enclosing
4498 -- instance from direct visibility.
4503 E := First_Entity (S);
4504 while Present (E) loop
4505 Set_Is_Immediately_Visible (E, False);
4514 or else (Ekind (Curr_Unit) = E_Package_Body
4515 and then S = Spec_Entity (Curr_Unit))
4516 or else (Ekind (Curr_Unit) = E_Subprogram_Body
4517 and then S = Corresponding_Spec
4518 (Unit_Declaration_Node (Curr_Unit)))
4522 -- Remove entities in current scopes from visibility, so that
4523 -- instance body is compiled in a clean environment.
4525 List := Save_Scope_Stack (Handle_Use => False);
4527 if Is_Child_Unit (S) then
4529 -- Remove child unit from stack, as well as inner scopes.
4530 -- Removing the context of a child unit removes parent units
4533 while Current_Scope /= S loop
4534 Num_Inner := Num_Inner + 1;
4535 Inner_Scopes (Num_Inner) := Current_Scope;
4540 Remove_Context (Curr_Comp);
4544 Remove_Context (Curr_Comp);
4547 if Ekind (Curr_Unit) = E_Package_Body then
4548 Remove_Context (Library_Unit (Curr_Comp));
4555 pragma Assert (Num_Inner < Num_Scopes);
4557 -- The inlined package body must be analyzed with the SPARK_Mode of
4558 -- the enclosing context, otherwise the body may cause bogus errors
4559 -- if a configuration SPARK_Mode pragma in in effect.
4561 Push_Scope (Standard_Standard);
4562 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
4563 Instantiate_Package_Body
4566 Act_Decl => Act_Decl,
4567 Expander_Status => Expander_Active,
4568 Current_Sem_Unit => Current_Sem_Unit,
4569 Scope_Suppress => Scope_Suppress,
4570 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4571 Version => Ada_Version,
4572 Version_Pragma => Ada_Version_Pragma,
4573 Warnings => Save_Warnings,
4574 SPARK_Mode => Save_SM,
4575 SPARK_Mode_Pragma => Save_SMP)),
4576 Inlined_Body => True);
4582 Set_Is_Immediately_Visible (Gen_Comp, Vis);
4584 -- Reset Generic_Instance flag so that use clauses can be installed
4585 -- in the proper order. (See Use_One_Package for effect of enclosing
4586 -- instances on processing of use clauses).
4588 for J in 1 .. N_Instances loop
4589 Set_Is_Generic_Instance (Instances (J), False);
4593 Install_Context (Curr_Comp);
4595 if Present (Curr_Scope)
4596 and then Is_Child_Unit (Curr_Scope)
4598 Push_Scope (Curr_Scope);
4599 Set_Is_Immediately_Visible (Curr_Scope);
4601 -- Finally, restore inner scopes as well
4603 for J in reverse 1 .. Num_Inner loop
4604 Push_Scope (Inner_Scopes (J));
4608 Restore_Scope_Stack (List, Handle_Use => False);
4610 if Present (Curr_Scope)
4612 (In_Private_Part (Curr_Scope)
4613 or else In_Package_Body (Curr_Scope))
4615 -- Install private declaration of ancestor units, which are
4616 -- currently available. Restore_Scope_Stack and Install_Context
4617 -- only install the visible part of parents.
4622 Par := Scope (Curr_Scope);
4623 while (Present (Par)) and then Par /= Standard_Standard loop
4624 Install_Private_Declarations (Par);
4631 -- Restore use clauses. For a child unit, use clauses in the parents
4632 -- are restored when installing the context, so only those in inner
4633 -- scopes (and those local to the child unit itself) need to be
4634 -- installed explicitly.
4636 if Is_Child_Unit (Curr_Unit) and then Removed then
4637 for J in reverse 1 .. Num_Inner + 1 loop
4638 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4640 Install_Use_Clauses (Use_Clauses (J));
4644 for J in reverse 1 .. Num_Scopes loop
4645 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
4647 Install_Use_Clauses (Use_Clauses (J));
4651 -- Restore status of instances. If one of them is a body, make its
4652 -- local entities visible again.
4659 for J in 1 .. N_Instances loop
4660 Inst := Instances (J);
4661 Set_Is_Generic_Instance (Inst, True);
4663 if In_Package_Body (Inst)
4664 or else Ekind_In (S, E_Procedure, E_Function)
4666 E := First_Entity (Instances (J));
4667 while Present (E) loop
4668 Set_Is_Immediately_Visible (E);
4675 -- If generic unit is in current unit, current context is correct. Note
4676 -- that the context is guaranteed to carry the correct SPARK_Mode as no
4677 -- enclosing scopes were removed.
4680 Instantiate_Package_Body
4683 Act_Decl => Act_Decl,
4684 Expander_Status => Expander_Active,
4685 Current_Sem_Unit => Current_Sem_Unit,
4686 Scope_Suppress => Scope_Suppress,
4687 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
4688 Version => Ada_Version,
4689 Version_Pragma => Ada_Version_Pragma,
4690 Warnings => Save_Warnings,
4691 SPARK_Mode => SPARK_Mode,
4692 SPARK_Mode_Pragma => SPARK_Mode_Pragma)),
4693 Inlined_Body => True);
4695 end Inline_Instance_Body;
4697 -------------------------------------
4698 -- Analyze_Procedure_Instantiation --
4699 -------------------------------------
4701 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
4703 Analyze_Subprogram_Instantiation (N, E_Procedure);
4704 end Analyze_Procedure_Instantiation;
4706 -----------------------------------
4707 -- Need_Subprogram_Instance_Body --
4708 -----------------------------------
4710 function Need_Subprogram_Instance_Body
4712 Subp : Entity_Id) return Boolean
4715 function Is_Inlined_Or_Child_Of_Inlined (E : Entity_Id) return Boolean;
4716 -- Return True if E is an inlined subprogram, an inlined renaming or a
4717 -- subprogram nested in an inlined subprogram. The inlining machinery
4718 -- totally disregards nested subprograms since it considers that they
4719 -- will always be compiled if the parent is (see Inline.Is_Nested).
4721 ------------------------------------
4722 -- Is_Inlined_Or_Child_Of_Inlined --
4723 ------------------------------------
4725 function Is_Inlined_Or_Child_Of_Inlined (E : Entity_Id) return Boolean is
4729 if Is_Inlined (E) or else Is_Inlined (Alias (E)) then
4734 while Scop /= Standard_Standard loop
4735 if Ekind (Scop) in Subprogram_Kind and then Is_Inlined (Scop) then
4739 Scop := Scope (Scop);
4743 end Is_Inlined_Or_Child_Of_Inlined;
4746 -- Must be in the main unit or inlined (or child of inlined)
4748 if (Is_In_Main_Unit (N) or else Is_Inlined_Or_Child_Of_Inlined (Subp))
4750 -- Must be generating code or analyzing code in ASIS/GNATprove mode
4752 and then (Operating_Mode = Generate_Code
4753 or else (Operating_Mode = Check_Semantics
4754 and then (ASIS_Mode or GNATprove_Mode)))
4756 -- The body is needed when generating code (full expansion), in ASIS
4757 -- mode for other tools, and in GNATprove mode (special expansion) for
4758 -- formal verification of the body itself.
4760 and then (Expander_Active or ASIS_Mode or GNATprove_Mode)
4762 -- No point in inlining if ABE is inevitable
4764 and then not ABE_Is_Certain (N)
4766 -- Or if subprogram is eliminated
4768 and then not Is_Eliminated (Subp)
4770 Add_Pending_Instantiation (N, Unit_Declaration_Node (Subp));
4773 -- Here if not inlined, or we ignore the inlining
4778 end Need_Subprogram_Instance_Body;
4780 --------------------------------------
4781 -- Analyze_Subprogram_Instantiation --
4782 --------------------------------------
4784 procedure Analyze_Subprogram_Instantiation
4788 Loc : constant Source_Ptr := Sloc (N);
4789 Gen_Id : constant Node_Id := Name (N);
4791 Anon_Id : constant Entity_Id :=
4792 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
4793 Chars => New_External_Name
4794 (Chars (Defining_Entity (N)), 'R'));
4796 Act_Decl_Id : Entity_Id;
4801 Env_Installed : Boolean := False;
4802 Gen_Unit : Entity_Id;
4804 Pack_Id : Entity_Id;
4805 Parent_Installed : Boolean := False;
4807 Renaming_List : List_Id;
4808 -- The list of declarations that link formals and actuals of the
4809 -- instance. These are subtype declarations for formal types, and
4810 -- renaming declarations for other formals. The subprogram declaration
4811 -- for the instance is then appended to the list, and the last item on
4812 -- the list is the renaming declaration for the instance.
4814 procedure Analyze_Instance_And_Renamings;
4815 -- The instance must be analyzed in a context that includes the mappings
4816 -- of generic parameters into actuals. We create a package declaration
4817 -- for this purpose, and a subprogram with an internal name within the
4818 -- package. The subprogram instance is simply an alias for the internal
4819 -- subprogram, declared in the current scope.
4821 procedure Build_Subprogram_Renaming;
4822 -- If the subprogram is recursive, there are occurrences of the name of
4823 -- the generic within the body, which must resolve to the current
4824 -- instance. We add a renaming declaration after the declaration, which
4825 -- is available in the instance body, as well as in the analysis of
4826 -- aspects that appear in the generic. This renaming declaration is
4827 -- inserted after the instance declaration which it renames.
4829 ------------------------------------
4830 -- Analyze_Instance_And_Renamings --
4831 ------------------------------------
4833 procedure Analyze_Instance_And_Renamings is
4834 Def_Ent : constant Entity_Id := Defining_Entity (N);
4835 Pack_Decl : Node_Id;
4838 if Nkind (Parent (N)) = N_Compilation_Unit then
4840 -- For the case of a compilation unit, the container package has
4841 -- the same name as the instantiation, to insure that the binder
4842 -- calls the elaboration procedure with the right name. Copy the
4843 -- entity of the instance, which may have compilation level flags
4844 -- (e.g. Is_Child_Unit) set.
4846 Pack_Id := New_Copy (Def_Ent);
4849 -- Otherwise we use the name of the instantiation concatenated
4850 -- with its source position to ensure uniqueness if there are
4851 -- several instantiations with the same name.
4854 Make_Defining_Identifier (Loc,
4855 Chars => New_External_Name
4856 (Related_Id => Chars (Def_Ent),
4858 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
4862 Make_Package_Declaration (Loc,
4863 Specification => Make_Package_Specification (Loc,
4864 Defining_Unit_Name => Pack_Id,
4865 Visible_Declarations => Renaming_List,
4866 End_Label => Empty));
4868 Set_Instance_Spec (N, Pack_Decl);
4869 Set_Is_Generic_Instance (Pack_Id);
4870 Set_Debug_Info_Needed (Pack_Id);
4872 -- Case of not a compilation unit
4874 if Nkind (Parent (N)) /= N_Compilation_Unit then
4875 Mark_Rewrite_Insertion (Pack_Decl);
4876 Insert_Before (N, Pack_Decl);
4877 Set_Has_Completion (Pack_Id);
4879 -- Case of an instantiation that is a compilation unit
4881 -- Place declaration on current node so context is complete for
4882 -- analysis (including nested instantiations), and for use in a
4883 -- context_clause (see Analyze_With_Clause).
4886 Set_Unit (Parent (N), Pack_Decl);
4887 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
4890 Analyze (Pack_Decl);
4891 Check_Formal_Packages (Pack_Id);
4892 Set_Is_Generic_Instance (Pack_Id, False);
4894 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4897 -- Body of the enclosing package is supplied when instantiating the
4898 -- subprogram body, after semantic analysis is completed.
4900 if Nkind (Parent (N)) = N_Compilation_Unit then
4902 -- Remove package itself from visibility, so it does not
4903 -- conflict with subprogram.
4905 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
4907 -- Set name and scope of internal subprogram so that the proper
4908 -- external name will be generated. The proper scope is the scope
4909 -- of the wrapper package. We need to generate debugging info for
4910 -- the internal subprogram, so set flag accordingly.
4912 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
4913 Set_Scope (Anon_Id, Scope (Pack_Id));
4915 -- Mark wrapper package as referenced, to avoid spurious warnings
4916 -- if the instantiation appears in various with_ clauses of
4917 -- subunits of the main unit.
4919 Set_Referenced (Pack_Id);
4922 Set_Is_Generic_Instance (Anon_Id);
4923 Set_Debug_Info_Needed (Anon_Id);
4924 Act_Decl_Id := New_Copy (Anon_Id);
4926 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4927 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
4928 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
4930 -- Subprogram instance comes from source only if generic does
4932 Set_Comes_From_Source (Act_Decl_Id, Comes_From_Source (Gen_Unit));
4934 -- If the instance is a child unit, mark the Id accordingly. Mark
4935 -- the anonymous entity as well, which is the real subprogram and
4936 -- which is used when the instance appears in a context clause.
4937 -- Similarly, propagate the Is_Eliminated flag to handle properly
4938 -- nested eliminated subprograms.
4940 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
4941 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
4942 New_Overloaded_Entity (Act_Decl_Id);
4943 Check_Eliminated (Act_Decl_Id);
4944 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id));
4946 -- In compilation unit case, kill elaboration checks on the
4947 -- instantiation, since they are never needed -- the body is
4948 -- instantiated at the same point as the spec.
4950 if Nkind (Parent (N)) = N_Compilation_Unit then
4951 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
4952 Set_Kill_Elaboration_Checks (Act_Decl_Id);
4953 Set_Is_Compilation_Unit (Anon_Id);
4955 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
4958 -- The instance is not a freezing point for the new subprogram.
4959 -- The anonymous subprogram may have a freeze node, created for
4960 -- some delayed aspects. This freeze node must not be inherited
4961 -- by the visible subprogram entity.
4963 Set_Is_Frozen (Act_Decl_Id, False);
4964 Set_Freeze_Node (Act_Decl_Id, Empty);
4966 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
4967 Valid_Operator_Definition (Act_Decl_Id);
4970 Set_Alias (Act_Decl_Id, Anon_Id);
4971 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
4972 Set_Has_Completion (Act_Decl_Id);
4973 Set_Related_Instance (Pack_Id, Act_Decl_Id);
4975 if Nkind (Parent (N)) = N_Compilation_Unit then
4976 Set_Body_Required (Parent (N), False);
4978 end Analyze_Instance_And_Renamings;
4980 -------------------------------
4981 -- Build_Subprogram_Renaming --
4982 -------------------------------
4984 procedure Build_Subprogram_Renaming is
4985 Renaming_Decl : Node_Id;
4986 Unit_Renaming : Node_Id;
4990 Make_Subprogram_Renaming_Declaration (Loc,
4993 (Specification (Original_Node (Gen_Decl)),
4995 Instantiating => True),
4996 Name => New_Occurrence_Of (Anon_Id, Loc));
4998 -- The generic may be a a child unit. The renaming needs an
4999 -- identifier with the proper name.
5001 Set_Defining_Unit_Name (Specification (Unit_Renaming),
5002 Make_Defining_Identifier (Loc, Chars (Gen_Unit)));
5004 -- If there is a formal subprogram with the same name as the unit
5005 -- itself, do not add this renaming declaration, to prevent
5006 -- ambiguities when there is a call with that name in the body.
5007 -- This is a partial and ugly fix for one ACATS test. ???
5009 Renaming_Decl := First (Renaming_List);
5010 while Present (Renaming_Decl) loop
5011 if Nkind (Renaming_Decl) = N_Subprogram_Renaming_Declaration
5013 Chars (Defining_Entity (Renaming_Decl)) = Chars (Gen_Unit)
5018 Next (Renaming_Decl);
5021 if No (Renaming_Decl) then
5022 Append (Unit_Renaming, Renaming_List);
5024 end Build_Subprogram_Renaming;
5028 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode;
5029 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit
5031 Save_SM : constant SPARK_Mode_Type := SPARK_Mode;
5032 Save_SMP : constant Node_Id := SPARK_Mode_Pragma;
5033 -- Save the SPARK_Mode-related data for restore on exit
5035 Vis_Prims_List : Elist_Id := No_Elist;
5036 -- List of primitives made temporarily visible in the instantiation
5037 -- to match the visibility of the formal type
5039 -- Start of processing for Analyze_Subprogram_Instantiation
5042 Check_SPARK_05_Restriction ("generic is not allowed", N);
5044 -- Very first thing: check for special Text_IO unit in case we are
5045 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5046 -- such an instantiation is bogus (these are packages, not subprograms),
5047 -- but we get a better error message if we do this.
5049 Check_Text_IO_Special_Unit (Gen_Id);
5051 -- Make node global for error reporting
5053 Instantiation_Node := N;
5055 -- For package instantiations we turn off style checks, because they
5056 -- will have been emitted in the generic. For subprogram instantiations
5057 -- we want to apply at least the check on overriding indicators so we
5058 -- do not modify the style check status.
5060 -- The renaming declarations for the actuals do not come from source and
5061 -- will not generate spurious warnings.
5063 Preanalyze_Actuals (N);
5066 Env_Installed := True;
5067 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
5068 Gen_Unit := Entity (Gen_Id);
5070 Generate_Reference (Gen_Unit, Gen_Id);
5072 if Nkind (Gen_Id) = N_Identifier
5073 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
5076 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
5079 if Etype (Gen_Unit) = Any_Type then
5084 -- Verify that it is a generic subprogram of the right kind, and that
5085 -- it does not lead to a circular instantiation.
5087 if K = E_Procedure and then Ekind (Gen_Unit) /= E_Generic_Procedure then
5089 ("& is not the name of a generic procedure", Gen_Id, Gen_Unit);
5091 elsif K = E_Function and then Ekind (Gen_Unit) /= E_Generic_Function then
5093 ("& is not the name of a generic function", Gen_Id, Gen_Unit);
5095 elsif In_Open_Scopes (Gen_Unit) then
5096 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
5099 -- If the context of the instance is subject to SPARK_Mode "off" or
5100 -- the annotation is altogether missing, set the global flag which
5101 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5104 if SPARK_Mode /= On then
5105 Ignore_Pragma_SPARK_Mode := True;
5108 Set_Entity (Gen_Id, Gen_Unit);
5109 Set_Is_Instantiated (Gen_Unit);
5111 if In_Extended_Main_Source_Unit (N) then
5112 Generate_Reference (Gen_Unit, N);
5115 -- If renaming, get original unit
5117 if Present (Renamed_Object (Gen_Unit))
5118 and then Ekind_In (Renamed_Object (Gen_Unit), E_Generic_Procedure,
5121 Gen_Unit := Renamed_Object (Gen_Unit);
5122 Set_Is_Instantiated (Gen_Unit);
5123 Generate_Reference (Gen_Unit, N);
5126 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
5127 Error_Msg_Node_2 := Current_Scope;
5129 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
5130 Circularity_Detected := True;
5131 Restore_Hidden_Primitives (Vis_Prims_List);
5135 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
5137 -- Initialize renamings map, for error checking
5139 Generic_Renamings.Set_Last (0);
5140 Generic_Renamings_HTable.Reset;
5142 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
5144 -- Copy original generic tree, to produce text for instantiation
5148 (Original_Node (Gen_Decl), Empty, Instantiating => True);
5150 -- Inherit overriding indicator from instance node
5152 Act_Spec := Specification (Act_Tree);
5153 Set_Must_Override (Act_Spec, Must_Override (N));
5154 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N));
5157 Analyze_Associations
5159 Formals => Generic_Formal_Declarations (Act_Tree),
5160 F_Copy => Generic_Formal_Declarations (Gen_Decl));
5162 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List);
5164 -- The subprogram itself cannot contain a nested instance, so the
5165 -- current parent is left empty.
5167 Set_Instance_Env (Gen_Unit, Empty);
5169 -- Build the subprogram declaration, which does not appear in the
5170 -- generic template, and give it a sloc consistent with that of the
5173 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
5174 Set_Generic_Parent (Act_Spec, Gen_Unit);
5176 Make_Subprogram_Declaration (Sloc (Act_Spec),
5177 Specification => Act_Spec);
5179 -- The aspects have been copied previously, but they have to be
5180 -- linked explicitly to the new subprogram declaration. Explicit
5181 -- pre/postconditions on the instance are analyzed below, in a
5184 Move_Aspects (Act_Tree, To => Act_Decl);
5185 Set_Categorization_From_Pragmas (Act_Decl);
5187 if Parent_Installed then
5191 Append (Act_Decl, Renaming_List);
5193 -- Contract-related source pragmas that follow a generic subprogram
5194 -- must be instantiated explicitly because they are not part of the
5195 -- subprogram template.
5197 Instantiate_Subprogram_Contract
5198 (Original_Node (Gen_Decl), Renaming_List);
5200 Build_Subprogram_Renaming;
5201 Analyze_Instance_And_Renamings;
5203 -- If the generic is marked Import (Intrinsic), then so is the
5204 -- instance. This indicates that there is no body to instantiate. If
5205 -- generic is marked inline, so it the instance, and the anonymous
5206 -- subprogram it renames. If inlined, or else if inlining is enabled
5207 -- for the compilation, we generate the instance body even if it is
5208 -- not within the main unit.
5210 if Is_Intrinsic_Subprogram (Gen_Unit) then
5211 Set_Is_Intrinsic_Subprogram (Anon_Id);
5212 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
5214 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
5215 Validate_Unchecked_Conversion (N, Act_Decl_Id);
5219 -- Inherit convention from generic unit. Intrinsic convention, as for
5220 -- an instance of unchecked conversion, is not inherited because an
5221 -- explicit Ada instance has been created.
5223 if Has_Convention_Pragma (Gen_Unit)
5224 and then Convention (Gen_Unit) /= Convention_Intrinsic
5226 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
5227 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit));
5230 Generate_Definition (Act_Decl_Id);
5232 -- Inherit all inlining-related flags which apply to the generic in
5233 -- the subprogram and its declaration.
5235 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
5236 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
5238 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit));
5239 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit));
5241 Set_Has_Pragma_Inline_Always
5242 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit));
5243 Set_Has_Pragma_Inline_Always
5244 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit));
5246 if not Is_Intrinsic_Subprogram (Gen_Unit) then
5247 Check_Elab_Instantiation (N);
5250 if Is_Dispatching_Operation (Act_Decl_Id)
5251 and then Ada_Version >= Ada_2005
5257 Formal := First_Formal (Act_Decl_Id);
5258 while Present (Formal) loop
5259 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type
5260 and then Is_Controlling_Formal (Formal)
5261 and then not Can_Never_Be_Null (Formal)
5264 ("access parameter& is controlling,", N, Formal);
5266 ("\corresponding parameter of & must be "
5267 & "explicitly null-excluding", N, Gen_Id);
5270 Next_Formal (Formal);
5275 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
5277 Validate_Categorization_Dependency (N, Act_Decl_Id);
5279 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
5280 Inherit_Context (Gen_Decl, N);
5282 Restore_Private_Views (Pack_Id, False);
5284 -- If the context requires a full instantiation, mark node for
5285 -- subsequent construction of the body.
5287 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then
5288 Check_Forward_Instantiation (Gen_Decl);
5290 -- The wrapper package is always delayed, because it does not
5291 -- constitute a freeze point, but to insure that the freeze node
5292 -- is placed properly, it is created directly when instantiating
5293 -- the body (otherwise the freeze node might appear to early for
5294 -- nested instantiations). For ASIS purposes, indicate that the
5295 -- wrapper package has replaced the instantiation node.
5297 elsif Nkind (Parent (N)) = N_Compilation_Unit then
5298 Rewrite (N, Unit (Parent (N)));
5299 Set_Unit (Parent (N), N);
5302 -- Replace instance node for library-level instantiations of
5303 -- intrinsic subprograms, for ASIS use.
5305 elsif Nkind (Parent (N)) = N_Compilation_Unit then
5306 Rewrite (N, Unit (Parent (N)));
5307 Set_Unit (Parent (N), N);
5310 if Parent_Installed then
5314 Restore_Hidden_Primitives (Vis_Prims_List);
5316 Env_Installed := False;
5317 Generic_Renamings.Set_Last (0);
5318 Generic_Renamings_HTable.Reset;
5320 Ignore_Pragma_SPARK_Mode := Save_IPSM;
5321 SPARK_Mode := Save_SM;
5322 SPARK_Mode_Pragma := Save_SMP;
5326 if Has_Aspects (N) then
5327 Analyze_Aspect_Specifications (N, Act_Decl_Id);
5331 when Instantiation_Error =>
5332 if Parent_Installed then
5336 if Env_Installed then
5340 Ignore_Pragma_SPARK_Mode := Save_IPSM;
5341 SPARK_Mode := Save_SM;
5342 SPARK_Mode_Pragma := Save_SMP;
5343 end Analyze_Subprogram_Instantiation;
5345 -------------------------
5346 -- Get_Associated_Node --
5347 -------------------------
5349 function Get_Associated_Node (N : Node_Id) return Node_Id is
5353 Assoc := Associated_Node (N);
5355 if Nkind (Assoc) /= Nkind (N) then
5358 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then
5362 -- If the node is part of an inner generic, it may itself have been
5363 -- remapped into a further generic copy. Associated_Node is otherwise
5364 -- used for the entity of the node, and will be of a different node
5365 -- kind, or else N has been rewritten as a literal or function call.
5367 while Present (Associated_Node (Assoc))
5368 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
5370 Assoc := Associated_Node (Assoc);
5373 -- Follow and additional link in case the final node was rewritten.
5374 -- This can only happen with nested generic units.
5376 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
5377 and then Present (Associated_Node (Assoc))
5378 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call,
5379 N_Explicit_Dereference,
5384 Assoc := Associated_Node (Assoc);
5387 -- An additional special case: an unconstrained type in an object
5388 -- declaration may have been rewritten as a local subtype constrained
5389 -- by the expression in the declaration. We need to recover the
5390 -- original entity which may be global.
5392 if Present (Original_Node (Assoc))
5393 and then Nkind (Parent (N)) = N_Object_Declaration
5395 Assoc := Original_Node (Assoc);
5400 end Get_Associated_Node;
5402 ----------------------------
5403 -- Build_Function_Wrapper --
5404 ----------------------------
5406 function Build_Function_Wrapper
5407 (Formal_Subp : Entity_Id;
5408 Actual_Subp : Entity_Id) return Node_Id
5410 Loc : constant Source_Ptr := Sloc (Current_Scope);
5411 Ret_Type : constant Entity_Id := Get_Instance_Of (Etype (Formal_Subp));
5414 Func_Name : Node_Id;
5416 Parm_Type : Node_Id;
5417 Profile : List_Id := New_List;
5424 Func_Name := New_Occurrence_Of (Actual_Subp, Loc);
5426 Func := Make_Defining_Identifier (Loc, Chars (Formal_Subp));
5427 Set_Ekind (Func, E_Function);
5428 Set_Is_Generic_Actual_Subprogram (Func);
5430 Actuals := New_List;
5431 Profile := New_List;
5433 Act_F := First_Formal (Actual_Subp);
5434 Form_F := First_Formal (Formal_Subp);
5435 while Present (Form_F) loop
5437 -- Create new formal for profile of wrapper, and add a reference
5438 -- to it in the list of actuals for the enclosing call. The name
5439 -- must be that of the formal in the formal subprogram, because
5440 -- calls to it in the generic body may use named associations.
5442 New_F := Make_Defining_Identifier (Loc, Chars (Form_F));
5445 New_Occurrence_Of (Get_Instance_Of (Etype (Form_F)), Loc);
5448 Make_Parameter_Specification (Loc,
5449 Defining_Identifier => New_F,
5450 Parameter_Type => Parm_Type));
5452 Append_To (Actuals, New_Occurrence_Of (New_F, Loc));
5453 Next_Formal (Form_F);
5455 if Present (Act_F) then
5456 Next_Formal (Act_F);
5461 Make_Function_Specification (Loc,
5462 Defining_Unit_Name => Func,
5463 Parameter_Specifications => Profile,
5464 Result_Definition => New_Occurrence_Of (Ret_Type, Loc));
5467 Make_Expression_Function (Loc,
5468 Specification => Spec,
5470 Make_Function_Call (Loc,
5472 Parameter_Associations => Actuals));
5475 end Build_Function_Wrapper;
5477 ----------------------------
5478 -- Build_Operator_Wrapper --
5479 ----------------------------
5481 function Build_Operator_Wrapper
5482 (Formal_Subp : Entity_Id;
5483 Actual_Subp : Entity_Id) return Node_Id
5485 Loc : constant Source_Ptr := Sloc (Current_Scope);
5486 Ret_Type : constant Entity_Id :=
5487 Get_Instance_Of (Etype (Formal_Subp));
5488 Op_Type : constant Entity_Id :=
5489 Get_Instance_Of (Etype (First_Formal (Formal_Subp)));
5490 Is_Binary : constant Boolean :=
5491 Present (Next_Formal (First_Formal (Formal_Subp)));
5502 Op_Name := Chars (Actual_Subp);
5504 -- Create entities for wrapper function and its formals
5506 F1 := Make_Temporary (Loc, 'A');
5507 F2 := Make_Temporary (Loc, 'B');
5508 L := New_Occurrence_Of (F1, Loc);
5509 R := New_Occurrence_Of (F2, Loc);
5511 Func := Make_Defining_Identifier (Loc, Chars (Formal_Subp));
5512 Set_Ekind (Func, E_Function);
5513 Set_Is_Generic_Actual_Subprogram (Func);
5516 Make_Function_Specification (Loc,
5517 Defining_Unit_Name => Func,
5518 Parameter_Specifications => New_List (
5519 Make_Parameter_Specification (Loc,
5520 Defining_Identifier => F1,
5521 Parameter_Type => New_Occurrence_Of (Op_Type, Loc))),
5522 Result_Definition => New_Occurrence_Of (Ret_Type, Loc));
5525 Append_To (Parameter_Specifications (Spec),
5526 Make_Parameter_Specification (Loc,
5527 Defining_Identifier => F2,
5528 Parameter_Type => New_Occurrence_Of (Op_Type, Loc)));
5531 -- Build expression as a function call, or as an operator node
5532 -- that corresponds to the name of the actual, starting with
5533 -- binary operators.
5535 if Op_Name not in Any_Operator_Name then
5537 Make_Function_Call (Loc,
5539 New_Occurrence_Of (Actual_Subp, Loc),
5540 Parameter_Associations => New_List (L));
5543 Append_To (Parameter_Associations (Expr), R);
5548 elsif Is_Binary then
5549 if Op_Name = Name_Op_And then
5550 Expr := Make_Op_And (Loc, Left_Opnd => L, Right_Opnd => R);
5551 elsif Op_Name = Name_Op_Or then
5552 Expr := Make_Op_Or (Loc, Left_Opnd => L, Right_Opnd => R);
5553 elsif Op_Name = Name_Op_Xor then
5554 Expr := Make_Op_Xor (Loc, Left_Opnd => L, Right_Opnd => R);
5555 elsif Op_Name = Name_Op_Eq then
5556 Expr := Make_Op_Eq (Loc, Left_Opnd => L, Right_Opnd => R);
5557 elsif Op_Name = Name_Op_Ne then
5558 Expr := Make_Op_Ne (Loc, Left_Opnd => L, Right_Opnd => R);
5559 elsif Op_Name = Name_Op_Le then
5560 Expr := Make_Op_Le (Loc, Left_Opnd => L, Right_Opnd => R);
5561 elsif Op_Name = Name_Op_Gt then
5562 Expr := Make_Op_Gt (Loc, Left_Opnd => L, Right_Opnd => R);
5563 elsif Op_Name = Name_Op_Ge then
5564 Expr := Make_Op_Ge (Loc, Left_Opnd => L, Right_Opnd => R);
5565 elsif Op_Name = Name_Op_Lt then
5566 Expr := Make_Op_Lt (Loc, Left_Opnd => L, Right_Opnd => R);
5567 elsif Op_Name = Name_Op_Add then
5568 Expr := Make_Op_Add (Loc, Left_Opnd => L, Right_Opnd => R);
5569 elsif Op_Name = Name_Op_Subtract then
5570 Expr := Make_Op_Subtract (Loc, Left_Opnd => L, Right_Opnd => R);
5571 elsif Op_Name = Name_Op_Concat then
5572 Expr := Make_Op_Concat (Loc, Left_Opnd => L, Right_Opnd => R);
5573 elsif Op_Name = Name_Op_Multiply then
5574 Expr := Make_Op_Multiply (Loc, Left_Opnd => L, Right_Opnd => R);
5575 elsif Op_Name = Name_Op_Divide then
5576 Expr := Make_Op_Divide (Loc, Left_Opnd => L, Right_Opnd => R);
5577 elsif Op_Name = Name_Op_Mod then
5578 Expr := Make_Op_Mod (Loc, Left_Opnd => L, Right_Opnd => R);
5579 elsif Op_Name = Name_Op_Rem then
5580 Expr := Make_Op_Rem (Loc, Left_Opnd => L, Right_Opnd => R);
5581 elsif Op_Name = Name_Op_Expon then
5582 Expr := Make_Op_Expon (Loc, Left_Opnd => L, Right_Opnd => R);
5588 if Op_Name = Name_Op_Add then
5589 Expr := Make_Op_Plus (Loc, Right_Opnd => L);
5590 elsif Op_Name = Name_Op_Subtract then
5591 Expr := Make_Op_Minus (Loc, Right_Opnd => L);
5592 elsif Op_Name = Name_Op_Abs then
5593 Expr := Make_Op_Abs (Loc, Right_Opnd => L);
5594 elsif Op_Name = Name_Op_Not then
5595 Expr := Make_Op_Not (Loc, Right_Opnd => L);
5600 Make_Expression_Function (Loc,
5601 Specification => Spec,
5602 Expression => Expr);
5605 end Build_Operator_Wrapper;
5607 -------------------------------------------
5608 -- Build_Instance_Compilation_Unit_Nodes --
5609 -------------------------------------------
5611 procedure Build_Instance_Compilation_Unit_Nodes
5616 Decl_Cunit : Node_Id;
5617 Body_Cunit : Node_Id;
5619 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
5620 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
5623 -- A new compilation unit node is built for the instance declaration
5626 Make_Compilation_Unit (Sloc (N),
5627 Context_Items => Empty_List,
5629 Aux_Decls_Node => Make_Compilation_Unit_Aux (Sloc (N)));
5631 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
5633 -- The new compilation unit is linked to its body, but both share the
5634 -- same file, so we do not set Body_Required on the new unit so as not
5635 -- to create a spurious dependency on a non-existent body in the ali.
5636 -- This simplifies CodePeer unit traversal.
5638 -- We use the original instantiation compilation unit as the resulting
5639 -- compilation unit of the instance, since this is the main unit.
5641 Rewrite (N, Act_Body);
5643 -- Propagate the aspect specifications from the package body template to
5644 -- the instantiated version of the package body.
5646 if Has_Aspects (Act_Body) then
5647 Set_Aspect_Specifications
5648 (N, New_Copy_List_Tree (Aspect_Specifications (Act_Body)));
5651 Body_Cunit := Parent (N);
5653 -- The two compilation unit nodes are linked by the Library_Unit field
5655 Set_Library_Unit (Decl_Cunit, Body_Cunit);
5656 Set_Library_Unit (Body_Cunit, Decl_Cunit);
5658 -- Preserve the private nature of the package if needed
5660 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
5662 -- If the instance is not the main unit, its context, categorization
5663 -- and elaboration entity are not relevant to the compilation.
5665 if Body_Cunit /= Cunit (Main_Unit) then
5666 Make_Instance_Unit (Body_Cunit, In_Main => False);
5670 -- The context clause items on the instantiation, which are now attached
5671 -- to the body compilation unit (since the body overwrote the original
5672 -- instantiation node), semantically belong on the spec, so copy them
5673 -- there. It's harmless to leave them on the body as well. In fact one
5674 -- could argue that they belong in both places.
5676 Citem := First (Context_Items (Body_Cunit));
5677 while Present (Citem) loop
5678 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
5682 -- Propagate categorization flags on packages, so that they appear in
5683 -- the ali file for the spec of the unit.
5685 if Ekind (New_Main) = E_Package then
5686 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
5687 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
5688 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
5689 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
5690 Set_Is_Remote_Call_Interface
5691 (Old_Main, Is_Remote_Call_Interface (New_Main));
5694 -- Make entry in Units table, so that binder can generate call to
5695 -- elaboration procedure for body, if any.
5697 Make_Instance_Unit (Body_Cunit, In_Main => True);
5698 Main_Unit_Entity := New_Main;
5699 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
5701 -- Build elaboration entity, since the instance may certainly generate
5702 -- elaboration code requiring a flag for protection.
5704 Build_Elaboration_Entity (Decl_Cunit, New_Main);
5705 end Build_Instance_Compilation_Unit_Nodes;
5707 -----------------------------
5708 -- Check_Access_Definition --
5709 -----------------------------
5711 procedure Check_Access_Definition (N : Node_Id) is
5714 (Ada_Version >= Ada_2005 and then Present (Access_Definition (N)));
5716 end Check_Access_Definition;
5718 -----------------------------------
5719 -- Check_Formal_Package_Instance --
5720 -----------------------------------
5722 -- If the formal has specific parameters, they must match those of the
5723 -- actual. Both of them are instances, and the renaming declarations for
5724 -- their formal parameters appear in the same order in both. The analyzed
5725 -- formal has been analyzed in the context of the current instance.
5727 procedure Check_Formal_Package_Instance
5728 (Formal_Pack : Entity_Id;
5729 Actual_Pack : Entity_Id)
5731 E1 : Entity_Id := First_Entity (Actual_Pack);
5732 E2 : Entity_Id := First_Entity (Formal_Pack);
5737 procedure Check_Mismatch (B : Boolean);
5738 -- Common error routine for mismatch between the parameters of the
5739 -- actual instance and those of the formal package.
5741 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
5742 -- The formal may come from a nested formal package, and the actual may
5743 -- have been constant-folded. To determine whether the two denote the
5744 -- same entity we may have to traverse several definitions to recover
5745 -- the ultimate entity that they refer to.
5747 function Same_Instantiated_Function (E1, E2 : Entity_Id) return Boolean;
5748 -- The formal and the actual must be identical, but if both are
5749 -- given by attributes they end up renaming different generated bodies,
5750 -- and we must verify that the attributes themselves match.
5752 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
5753 -- Similarly, if the formal comes from a nested formal package, the
5754 -- actual may designate the formal through multiple renamings, which
5755 -- have to be followed to determine the original variable in question.
5757 --------------------
5758 -- Check_Mismatch --
5759 --------------------
5761 procedure Check_Mismatch (B : Boolean) is
5762 -- A Formal_Type_Declaration for a derived private type is rewritten
5763 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
5764 -- which is why we examine the original node.
5766 Kind : constant Node_Kind := Nkind (Original_Node (Parent (E2)));
5769 if Kind = N_Formal_Type_Declaration then
5772 elsif Nkind_In (Kind, N_Formal_Object_Declaration,
5773 N_Formal_Package_Declaration)
5774 or else Kind in N_Formal_Subprogram_Declaration
5778 -- Ada 2012: If both formal and actual are incomplete types they
5781 elsif Is_Incomplete_Type (E1) and then Is_Incomplete_Type (E2) then
5786 ("actual for & in actual instance does not match formal",
5787 Parent (Actual_Pack), E1);
5791 --------------------------------
5792 -- Same_Instantiated_Constant --
5793 --------------------------------
5795 function Same_Instantiated_Constant
5796 (E1, E2 : Entity_Id) return Boolean
5802 while Present (Ent) loop
5806 elsif Ekind (Ent) /= E_Constant then
5809 elsif Is_Entity_Name (Constant_Value (Ent)) then
5810 if Entity (Constant_Value (Ent)) = E1 then
5813 Ent := Entity (Constant_Value (Ent));
5816 -- The actual may be a constant that has been folded. Recover
5819 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
5820 Ent := Entity (Original_Node (Constant_Value (Ent)));
5828 end Same_Instantiated_Constant;
5830 --------------------------------
5831 -- Same_Instantiated_Function --
5832 --------------------------------
5834 function Same_Instantiated_Function
5835 (E1, E2 : Entity_Id) return Boolean
5839 if Alias (E1) = Alias (E2) then
5842 elsif Present (Alias (E2)) then
5843 U1 := Original_Node (Unit_Declaration_Node (E1));
5844 U2 := Original_Node (Unit_Declaration_Node (Alias (E2)));
5846 return Nkind (U1) = N_Subprogram_Renaming_Declaration
5847 and then Nkind (Name (U1)) = N_Attribute_Reference
5849 and then Nkind (U2) = N_Subprogram_Renaming_Declaration
5850 and then Nkind (Name (U2)) = N_Attribute_Reference
5853 Attribute_Name (Name (U1)) = Attribute_Name (Name (U2));
5857 end Same_Instantiated_Function;
5859 --------------------------------
5860 -- Same_Instantiated_Variable --
5861 --------------------------------
5863 function Same_Instantiated_Variable
5864 (E1, E2 : Entity_Id) return Boolean
5866 function Original_Entity (E : Entity_Id) return Entity_Id;
5867 -- Follow chain of renamings to the ultimate ancestor
5869 ---------------------
5870 -- Original_Entity --
5871 ---------------------
5873 function Original_Entity (E : Entity_Id) return Entity_Id is
5878 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
5879 and then Present (Renamed_Object (Orig))
5880 and then Is_Entity_Name (Renamed_Object (Orig))
5882 Orig := Entity (Renamed_Object (Orig));
5886 end Original_Entity;
5888 -- Start of processing for Same_Instantiated_Variable
5891 return Ekind (E1) = Ekind (E2)
5892 and then Original_Entity (E1) = Original_Entity (E2);
5893 end Same_Instantiated_Variable;
5895 -- Start of processing for Check_Formal_Package_Instance
5898 while Present (E1) and then Present (E2) loop
5899 exit when Ekind (E1) = E_Package
5900 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
5902 -- If the formal is the renaming of the formal package, this
5903 -- is the end of its formal part, which may occur before the
5904 -- end of the formal part in the actual in the presence of
5905 -- defaulted parameters in the formal package.
5907 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration
5908 and then Renamed_Entity (E2) = Scope (E2);
5910 -- The analysis of the actual may generate additional internal
5911 -- entities. If the formal is defaulted, there is no corresponding
5912 -- analysis and the internal entities must be skipped, until we
5913 -- find corresponding entities again.
5915 if Comes_From_Source (E2)
5916 and then not Comes_From_Source (E1)
5917 and then Chars (E1) /= Chars (E2)
5919 while Present (E1) and then Chars (E1) /= Chars (E2) loop
5927 -- If the formal entity comes from a formal declaration, it was
5928 -- defaulted in the formal package, and no check is needed on it.
5930 elsif Nkind_In (Original_Node (Parent (E2)),
5931 N_Formal_Object_Declaration,
5932 N_Formal_Type_Declaration)
5936 -- Ditto for defaulted formal subprograms.
5938 elsif Is_Overloadable (E1)
5939 and then Nkind (Unit_Declaration_Node (E2)) in
5940 N_Formal_Subprogram_Declaration
5944 elsif Is_Type (E1) then
5946 -- Subtypes must statically match. E1, E2 are the local entities
5947 -- that are subtypes of the actuals. Itypes generated for other
5948 -- parameters need not be checked, the check will be performed
5949 -- on the parameters themselves.
5951 -- If E2 is a formal type declaration, it is a defaulted parameter
5952 -- and needs no checking.
5954 if not Is_Itype (E1) and then not Is_Itype (E2) then
5957 or else Etype (E1) /= Etype (E2)
5958 or else not Subtypes_Statically_Match (E1, E2));
5961 elsif Ekind (E1) = E_Constant then
5963 -- IN parameters must denote the same static value, or the same
5964 -- constant, or the literal null.
5966 Expr1 := Expression (Parent (E1));
5968 if Ekind (E2) /= E_Constant then
5969 Check_Mismatch (True);
5972 Expr2 := Expression (Parent (E2));
5975 if Is_OK_Static_Expression (Expr1) then
5976 if not Is_OK_Static_Expression (Expr2) then
5977 Check_Mismatch (True);
5979 elsif Is_Discrete_Type (Etype (E1)) then
5981 V1 : constant Uint := Expr_Value (Expr1);
5982 V2 : constant Uint := Expr_Value (Expr2);
5984 Check_Mismatch (V1 /= V2);
5987 elsif Is_Real_Type (Etype (E1)) then
5989 V1 : constant Ureal := Expr_Value_R (Expr1);
5990 V2 : constant Ureal := Expr_Value_R (Expr2);
5992 Check_Mismatch (V1 /= V2);
5995 elsif Is_String_Type (Etype (E1))
5996 and then Nkind (Expr1) = N_String_Literal
5998 if Nkind (Expr2) /= N_String_Literal then
5999 Check_Mismatch (True);
6002 (not String_Equal (Strval (Expr1), Strval (Expr2)));
6006 elsif Is_Entity_Name (Expr1) then
6007 if Is_Entity_Name (Expr2) then
6008 if Entity (Expr1) = Entity (Expr2) then
6012 (not Same_Instantiated_Constant
6013 (Entity (Expr1), Entity (Expr2)));
6017 Check_Mismatch (True);
6020 elsif Is_Entity_Name (Original_Node (Expr1))
6021 and then Is_Entity_Name (Expr2)
6022 and then Same_Instantiated_Constant
6023 (Entity (Original_Node (Expr1)), Entity (Expr2))
6027 elsif Nkind (Expr1) = N_Null then
6028 Check_Mismatch (Nkind (Expr1) /= N_Null);
6031 Check_Mismatch (True);
6034 elsif Ekind (E1) = E_Variable then
6035 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
6037 elsif Ekind (E1) = E_Package then
6039 (Ekind (E1) /= Ekind (E2)
6040 or else Renamed_Object (E1) /= Renamed_Object (E2));
6042 elsif Is_Overloadable (E1) then
6044 -- Verify that the actual subprograms match. Note that actuals
6045 -- that are attributes are rewritten as subprograms. If the
6046 -- subprogram in the formal package is defaulted, no check is
6047 -- needed. Note that this can only happen in Ada 2005 when the
6048 -- formal package can be partially parameterized.
6050 if Nkind (Unit_Declaration_Node (E1)) =
6051 N_Subprogram_Renaming_Declaration
6052 and then From_Default (Unit_Declaration_Node (E1))
6056 -- If the formal package has an "others" box association that
6057 -- covers this formal, there is no need for a check either.
6059 elsif Nkind (Unit_Declaration_Node (E2)) in
6060 N_Formal_Subprogram_Declaration
6061 and then Box_Present (Unit_Declaration_Node (E2))
6065 -- No check needed if subprogram is a defaulted null procedure
6067 elsif No (Alias (E2))
6068 and then Ekind (E2) = E_Procedure
6070 Null_Present (Specification (Unit_Declaration_Node (E2)))
6074 -- Otherwise the actual in the formal and the actual in the
6075 -- instantiation of the formal must match, up to renamings.
6079 (Ekind (E2) /= Ekind (E1)
6080 or else not Same_Instantiated_Function (E1, E2));
6084 raise Program_Error;
6091 end Check_Formal_Package_Instance;
6093 ---------------------------
6094 -- Check_Formal_Packages --
6095 ---------------------------
6097 procedure Check_Formal_Packages (P_Id : Entity_Id) is
6099 Formal_P : Entity_Id;
6100 Formal_Decl : Node_Id;
6103 -- Iterate through the declarations in the instance, looking for package
6104 -- renaming declarations that denote instances of formal packages. Stop
6105 -- when we find the renaming of the current package itself. The
6106 -- declaration for a formal package without a box is followed by an
6107 -- internal entity that repeats the instantiation.
6109 E := First_Entity (P_Id);
6110 while Present (E) loop
6111 if Ekind (E) = E_Package then
6112 if Renamed_Object (E) = P_Id then
6115 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
6119 Formal_Decl := Parent (Associated_Formal_Package (E));
6121 -- Nothing to check if the formal has a box or an others_clause
6122 -- (necessarily with a box).
6124 if Box_Present (Formal_Decl) then
6127 elsif Nkind (First (Generic_Associations (Formal_Decl))) =
6130 -- The internal validating package was generated but formal
6131 -- and instance are known to be compatible.
6133 Formal_P := Next_Entity (E);
6134 Remove (Unit_Declaration_Node (Formal_P));
6137 Formal_P := Next_Entity (E);
6138 Check_Formal_Package_Instance (Formal_P, E);
6140 -- After checking, remove the internal validating package.
6141 -- It is only needed for semantic checks, and as it may
6142 -- contain generic formal declarations it should not reach
6145 Remove (Unit_Declaration_Node (Formal_P));
6152 end Check_Formal_Packages;
6154 ---------------------------------
6155 -- Check_Forward_Instantiation --
6156 ---------------------------------
6158 procedure Check_Forward_Instantiation (Decl : Node_Id) is
6160 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
6163 -- The instantiation appears before the generic body if we are in the
6164 -- scope of the unit containing the generic, either in its spec or in
6165 -- the package body, and before the generic body.
6167 if Ekind (Gen_Comp) = E_Package_Body then
6168 Gen_Comp := Spec_Entity (Gen_Comp);
6171 if In_Open_Scopes (Gen_Comp)
6172 and then No (Corresponding_Body (Decl))
6177 and then not Is_Compilation_Unit (S)
6178 and then not Is_Child_Unit (S)
6180 if Ekind (S) = E_Package then
6181 Set_Has_Forward_Instantiation (S);
6187 end Check_Forward_Instantiation;
6189 ---------------------------
6190 -- Check_Generic_Actuals --
6191 ---------------------------
6193 -- The visibility of the actuals may be different between the point of
6194 -- generic instantiation and the instantiation of the body.
6196 procedure Check_Generic_Actuals
6197 (Instance : Entity_Id;
6198 Is_Formal_Box : Boolean)
6203 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
6204 -- For a formal that is an array type, the component type is often a
6205 -- previous formal in the same unit. The privacy status of the component
6206 -- type will have been examined earlier in the traversal of the
6207 -- corresponding actuals, and this status should not be modified for
6208 -- the array (sub)type itself. However, if the base type of the array
6209 -- (sub)type is private, its full view must be restored in the body to
6210 -- be consistent with subsequent index subtypes, etc.
6212 -- To detect this case we have to rescan the list of formals, which is
6213 -- usually short enough to ignore the resulting inefficiency.
6215 -----------------------------
6216 -- Denotes_Previous_Actual --
6217 -----------------------------
6219 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
6223 Prev := First_Entity (Instance);
6224 while Present (Prev) loop
6226 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
6227 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
6228 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
6241 end Denotes_Previous_Actual;
6243 -- Start of processing for Check_Generic_Actuals
6246 E := First_Entity (Instance);
6247 while Present (E) loop
6249 and then Nkind (Parent (E)) = N_Subtype_Declaration
6250 and then Scope (Etype (E)) /= Instance
6251 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
6253 if Is_Array_Type (E)
6254 and then not Is_Private_Type (Etype (E))
6255 and then Denotes_Previous_Actual (Component_Type (E))
6259 Check_Private_View (Subtype_Indication (Parent (E)));
6262 Set_Is_Generic_Actual_Type (E, True);
6263 Set_Is_Hidden (E, False);
6264 Set_Is_Potentially_Use_Visible (E,
6267 -- We constructed the generic actual type as a subtype of the
6268 -- supplied type. This means that it normally would not inherit
6269 -- subtype specific attributes of the actual, which is wrong for
6270 -- the generic case.
6272 Astype := Ancestor_Subtype (E);
6276 -- This can happen when E is an itype that is the full view of
6277 -- a private type completed, e.g. with a constrained array. In
6278 -- that case, use the first subtype, which will carry size
6279 -- information. The base type itself is unconstrained and will
6282 Astype := First_Subtype (E);
6285 Set_Size_Info (E, (Astype));
6286 Set_RM_Size (E, RM_Size (Astype));
6287 Set_First_Rep_Item (E, First_Rep_Item (Astype));
6289 if Is_Discrete_Or_Fixed_Point_Type (E) then
6290 Set_RM_Size (E, RM_Size (Astype));
6292 -- In nested instances, the base type of an access actual may
6293 -- itself be private, and need to be exchanged.
6295 elsif Is_Access_Type (E)
6296 and then Is_Private_Type (Etype (E))
6299 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
6302 elsif Ekind (E) = E_Package then
6304 -- If this is the renaming for the current instance, we're done.
6305 -- Otherwise it is a formal package. If the corresponding formal
6306 -- was declared with a box, the (instantiations of the) generic
6307 -- formal part are also visible. Otherwise, ignore the entity
6308 -- created to validate the actuals.
6310 if Renamed_Object (E) = Instance then
6313 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
6316 -- The visibility of a formal of an enclosing generic is already
6319 elsif Denotes_Formal_Package (E) then
6322 elsif Present (Associated_Formal_Package (E))
6323 and then not Is_Generic_Formal (E)
6325 if Box_Present (Parent (Associated_Formal_Package (E))) then
6326 Check_Generic_Actuals (Renamed_Object (E), True);
6329 Check_Generic_Actuals (Renamed_Object (E), False);
6332 Set_Is_Hidden (E, False);
6335 -- If this is a subprogram instance (in a wrapper package) the
6336 -- actual is fully visible.
6338 elsif Is_Wrapper_Package (Instance) then
6339 Set_Is_Hidden (E, False);
6341 -- If the formal package is declared with a box, or if the formal
6342 -- parameter is defaulted, it is visible in the body.
6344 elsif Is_Formal_Box or else Is_Visible_Formal (E) then
6345 Set_Is_Hidden (E, False);
6348 if Ekind (E) = E_Constant then
6350 -- If the type of the actual is a private type declared in the
6351 -- enclosing scope of the generic unit, the body of the generic
6352 -- sees the full view of the type (because it has to appear in
6353 -- the corresponding package body). If the type is private now,
6354 -- exchange views to restore the proper visiblity in the instance.
6357 Typ : constant Entity_Id := Base_Type (Etype (E));
6358 -- The type of the actual
6363 Parent_Scope : Entity_Id;
6364 -- The enclosing scope of the generic unit
6367 if Is_Wrapper_Package (Instance) then
6371 (Unit_Declaration_Node
6372 (Related_Instance (Instance))));
6375 Generic_Parent (Package_Specification (Instance));
6378 Parent_Scope := Scope (Gen_Id);
6380 -- The exchange is only needed if the generic is defined
6381 -- within a package which is not a common ancestor of the
6382 -- scope of the instance, and is not already in scope.
6384 if Is_Private_Type (Typ)
6385 and then Scope (Typ) = Parent_Scope
6386 and then Scope (Instance) /= Parent_Scope
6387 and then Ekind (Parent_Scope) = E_Package
6388 and then not Is_Child_Unit (Gen_Id)
6392 -- If the type of the entity is a subtype, it may also have
6393 -- to be made visible, together with the base type of its
6394 -- full view, after exchange.
6396 if Is_Private_Type (Etype (E)) then
6397 Switch_View (Etype (E));
6398 Switch_View (Base_Type (Etype (E)));
6406 end Check_Generic_Actuals;
6408 ------------------------------
6409 -- Check_Generic_Child_Unit --
6410 ------------------------------
6412 procedure Check_Generic_Child_Unit
6414 Parent_Installed : in out Boolean)
6416 Loc : constant Source_Ptr := Sloc (Gen_Id);
6417 Gen_Par : Entity_Id := Empty;
6419 Inst_Par : Entity_Id;
6422 function Find_Generic_Child
6424 Id : Node_Id) return Entity_Id;
6425 -- Search generic parent for possible child unit with the given name
6427 function In_Enclosing_Instance return Boolean;
6428 -- Within an instance of the parent, the child unit may be denoted by
6429 -- a simple name, or an abbreviated expanded name. Examine enclosing
6430 -- scopes to locate a possible parent instantiation.
6432 ------------------------
6433 -- Find_Generic_Child --
6434 ------------------------
6436 function Find_Generic_Child
6438 Id : Node_Id) return Entity_Id
6443 -- If entity of name is already set, instance has already been
6444 -- resolved, e.g. in an enclosing instantiation.
6446 if Present (Entity (Id)) then
6447 if Scope (Entity (Id)) = Scop then
6454 E := First_Entity (Scop);
6455 while Present (E) loop
6456 if Chars (E) = Chars (Id)
6457 and then Is_Child_Unit (E)
6459 if Is_Child_Unit (E)
6460 and then not Is_Visible_Lib_Unit (E)
6463 ("generic child unit& is not visible", Gen_Id, E);
6475 end Find_Generic_Child;
6477 ---------------------------
6478 -- In_Enclosing_Instance --
6479 ---------------------------
6481 function In_Enclosing_Instance return Boolean is
6482 Enclosing_Instance : Node_Id;
6483 Instance_Decl : Node_Id;
6486 -- We do not inline any call that contains instantiations, except
6487 -- for instantiations of Unchecked_Conversion, so if we are within
6488 -- an inlined body the current instance does not require parents.
6490 if In_Inlined_Body then
6491 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion);
6495 -- Loop to check enclosing scopes
6497 Enclosing_Instance := Current_Scope;
6498 while Present (Enclosing_Instance) loop
6499 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
6501 if Ekind (Enclosing_Instance) = E_Package
6502 and then Is_Generic_Instance (Enclosing_Instance)
6504 (Generic_Parent (Specification (Instance_Decl)))
6506 -- Check whether the generic we are looking for is a child of
6509 E := Find_Generic_Child
6510 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
6511 exit when Present (E);
6517 Enclosing_Instance := Scope (Enclosing_Instance);
6529 Make_Expanded_Name (Loc,
6531 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
6532 Selector_Name => New_Occurrence_Of (E, Loc)));
6534 Set_Entity (Gen_Id, E);
6535 Set_Etype (Gen_Id, Etype (E));
6536 Parent_Installed := False; -- Already in scope.
6539 end In_Enclosing_Instance;
6541 -- Start of processing for Check_Generic_Child_Unit
6544 -- If the name of the generic is given by a selected component, it may
6545 -- be the name of a generic child unit, and the prefix is the name of an
6546 -- instance of the parent, in which case the child unit must be visible.
6547 -- If this instance is not in scope, it must be placed there and removed
6548 -- after instantiation, because what is being instantiated is not the
6549 -- original child, but the corresponding child present in the instance
6552 -- If the child is instantiated within the parent, it can be given by
6553 -- a simple name. In this case the instance is already in scope, but
6554 -- the child generic must be recovered from the generic parent as well.
6556 if Nkind (Gen_Id) = N_Selected_Component then
6557 S := Selector_Name (Gen_Id);
6558 Analyze (Prefix (Gen_Id));
6559 Inst_Par := Entity (Prefix (Gen_Id));
6561 if Ekind (Inst_Par) = E_Package
6562 and then Present (Renamed_Object (Inst_Par))
6564 Inst_Par := Renamed_Object (Inst_Par);
6567 if Ekind (Inst_Par) = E_Package then
6568 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
6569 Gen_Par := Generic_Parent (Parent (Inst_Par));
6571 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
6573 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
6575 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
6578 elsif Ekind (Inst_Par) = E_Generic_Package
6579 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
6581 -- A formal package may be a real child package, and not the
6582 -- implicit instance within a parent. In this case the child is
6583 -- not visible and has to be retrieved explicitly as well.
6585 Gen_Par := Inst_Par;
6588 if Present (Gen_Par) then
6590 -- The prefix denotes an instantiation. The entity itself may be a
6591 -- nested generic, or a child unit.
6593 E := Find_Generic_Child (Gen_Par, S);
6596 Change_Selected_Component_To_Expanded_Name (Gen_Id);
6597 Set_Entity (Gen_Id, E);
6598 Set_Etype (Gen_Id, Etype (E));
6600 Set_Etype (S, Etype (E));
6602 -- Indicate that this is a reference to the parent
6604 if In_Extended_Main_Source_Unit (Gen_Id) then
6605 Set_Is_Instantiated (Inst_Par);
6608 -- A common mistake is to replicate the naming scheme of a
6609 -- hierarchy by instantiating a generic child directly, rather
6610 -- than the implicit child in a parent instance:
6612 -- generic .. package Gpar is ..
6613 -- generic .. package Gpar.Child is ..
6614 -- package Par is new Gpar ();
6617 -- package Par.Child is new Gpar.Child ();
6618 -- rather than Par.Child
6620 -- In this case the instantiation is within Par, which is an
6621 -- instance, but Gpar does not denote Par because we are not IN
6622 -- the instance of Gpar, so this is illegal. The test below
6623 -- recognizes this particular case.
6625 if Is_Child_Unit (E)
6626 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
6627 and then (not In_Instance
6628 or else Nkind (Parent (Parent (Gen_Id))) =
6632 ("prefix of generic child unit must be instance of parent",
6636 if not In_Open_Scopes (Inst_Par)
6637 and then Nkind (Parent (Gen_Id)) not in
6638 N_Generic_Renaming_Declaration
6640 Install_Parent (Inst_Par);
6641 Parent_Installed := True;
6643 elsif In_Open_Scopes (Inst_Par) then
6645 -- If the parent is already installed, install the actuals
6646 -- for its formal packages. This is necessary when the child
6647 -- instance is a child of the parent instance: in this case,
6648 -- the parent is placed on the scope stack but the formal
6649 -- packages are not made visible.
6651 Install_Formal_Packages (Inst_Par);
6655 -- If the generic parent does not contain an entity that
6656 -- corresponds to the selector, the instance doesn't either.
6657 -- Analyzing the node will yield the appropriate error message.
6658 -- If the entity is not a child unit, then it is an inner
6659 -- generic in the parent.
6667 if Is_Child_Unit (Entity (Gen_Id))
6669 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
6670 and then not In_Open_Scopes (Inst_Par)
6672 Install_Parent (Inst_Par);
6673 Parent_Installed := True;
6675 -- The generic unit may be the renaming of the implicit child
6676 -- present in an instance. In that case the parent instance is
6677 -- obtained from the name of the renamed entity.
6679 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package
6680 and then Present (Renamed_Entity (Entity (Gen_Id)))
6681 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id)))
6684 Renamed_Package : constant Node_Id :=
6685 Name (Parent (Entity (Gen_Id)));
6687 if Nkind (Renamed_Package) = N_Expanded_Name then
6688 Inst_Par := Entity (Prefix (Renamed_Package));
6689 Install_Parent (Inst_Par);
6690 Parent_Installed := True;
6696 elsif Nkind (Gen_Id) = N_Expanded_Name then
6698 -- Entity already present, analyze prefix, whose meaning may be an
6699 -- instance in the current context. If it is an instance of a
6700 -- relative within another, the proper parent may still have to be
6701 -- installed, if they are not of the same generation.
6703 Analyze (Prefix (Gen_Id));
6705 -- Prevent cascaded errors
6707 if Etype (Prefix (Gen_Id)) = Any_Type then
6711 -- In the unlikely case that a local declaration hides the name of
6712 -- the parent package, locate it on the homonym chain. If the context
6713 -- is an instance of the parent, the renaming entity is flagged as
6716 Inst_Par := Entity (Prefix (Gen_Id));
6717 while Present (Inst_Par)
6718 and then not Is_Package_Or_Generic_Package (Inst_Par)
6720 Inst_Par := Homonym (Inst_Par);
6723 pragma Assert (Present (Inst_Par));
6724 Set_Entity (Prefix (Gen_Id), Inst_Par);
6726 if In_Enclosing_Instance then
6729 elsif Present (Entity (Gen_Id))
6730 and then Is_Child_Unit (Entity (Gen_Id))
6731 and then not In_Open_Scopes (Inst_Par)
6733 Install_Parent (Inst_Par);
6734 Parent_Installed := True;
6737 elsif In_Enclosing_Instance then
6739 -- The child unit is found in some enclosing scope
6746 -- If this is the renaming of the implicit child in a parent
6747 -- instance, recover the parent name and install it.
6749 if Is_Entity_Name (Gen_Id) then
6750 E := Entity (Gen_Id);
6752 if Is_Generic_Unit (E)
6753 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
6754 and then Is_Child_Unit (Renamed_Object (E))
6755 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
6756 and then Nkind (Name (Parent (E))) = N_Expanded_Name
6758 Rewrite (Gen_Id, New_Copy_Tree (Name (Parent (E))));
6759 Inst_Par := Entity (Prefix (Gen_Id));
6761 if not In_Open_Scopes (Inst_Par) then
6762 Install_Parent (Inst_Par);
6763 Parent_Installed := True;
6766 -- If it is a child unit of a non-generic parent, it may be
6767 -- use-visible and given by a direct name. Install parent as
6770 elsif Is_Generic_Unit (E)
6771 and then Is_Child_Unit (E)
6773 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
6774 and then not Is_Generic_Unit (Scope (E))
6776 if not In_Open_Scopes (Scope (E)) then
6777 Install_Parent (Scope (E));
6778 Parent_Installed := True;
6783 end Check_Generic_Child_Unit;
6785 -----------------------------
6786 -- Check_Hidden_Child_Unit --
6787 -----------------------------
6789 procedure Check_Hidden_Child_Unit
6791 Gen_Unit : Entity_Id;
6792 Act_Decl_Id : Entity_Id)
6794 Gen_Id : constant Node_Id := Name (N);
6797 if Is_Child_Unit (Gen_Unit)
6798 and then Is_Child_Unit (Act_Decl_Id)
6799 and then Nkind (Gen_Id) = N_Expanded_Name
6800 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
6801 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
6803 Error_Msg_Node_2 := Scope (Act_Decl_Id);
6805 ("generic unit & is implicitly declared in &",
6806 Defining_Unit_Name (N), Gen_Unit);
6807 Error_Msg_N ("\instance must have different name",
6808 Defining_Unit_Name (N));
6810 end Check_Hidden_Child_Unit;
6812 ------------------------
6813 -- Check_Private_View --
6814 ------------------------
6816 procedure Check_Private_View (N : Node_Id) is
6817 T : constant Entity_Id := Etype (N);
6821 -- Exchange views if the type was not private in the generic but is
6822 -- private at the point of instantiation. Do not exchange views if
6823 -- the scope of the type is in scope. This can happen if both generic
6824 -- and instance are sibling units, or if type is defined in a parent.
6825 -- In this case the visibility of the type will be correct for all
6829 BT := Base_Type (T);
6831 if Is_Private_Type (T)
6832 and then not Has_Private_View (N)
6833 and then Present (Full_View (T))
6834 and then not In_Open_Scopes (Scope (T))
6836 -- In the generic, the full type was visible. Save the private
6837 -- entity, for subsequent exchange.
6841 elsif Has_Private_View (N)
6842 and then not Is_Private_Type (T)
6843 and then not Has_Been_Exchanged (T)
6844 and then Etype (Get_Associated_Node (N)) /= T
6846 -- Only the private declaration was visible in the generic. If
6847 -- the type appears in a subtype declaration, the subtype in the
6848 -- instance must have a view compatible with that of its parent,
6849 -- which must be exchanged (see corresponding code in Restore_
6850 -- Private_Views). Otherwise, if the type is defined in a parent
6851 -- unit, leave full visibility within instance, which is safe.
6853 if In_Open_Scopes (Scope (Base_Type (T)))
6854 and then not Is_Private_Type (Base_Type (T))
6855 and then Comes_From_Source (Base_Type (T))
6859 elsif Nkind (Parent (N)) = N_Subtype_Declaration
6860 or else not In_Private_Part (Scope (Base_Type (T)))
6862 Prepend_Elmt (T, Exchanged_Views);
6863 Exchange_Declarations (Etype (Get_Associated_Node (N)));
6866 -- For composite types with inconsistent representation exchange
6867 -- component types accordingly.
6869 elsif Is_Access_Type (T)
6870 and then Is_Private_Type (Designated_Type (T))
6871 and then not Has_Private_View (N)
6872 and then Present (Full_View (Designated_Type (T)))
6874 Switch_View (Designated_Type (T));
6876 elsif Is_Array_Type (T) then
6877 if Is_Private_Type (Component_Type (T))
6878 and then not Has_Private_View (N)
6879 and then Present (Full_View (Component_Type (T)))
6881 Switch_View (Component_Type (T));
6884 -- The normal exchange mechanism relies on the setting of a
6885 -- flag on the reference in the generic. However, an additional
6886 -- mechanism is needed for types that are not explicitly
6887 -- mentioned in the generic, but may be needed in expanded code
6888 -- in the instance. This includes component types of arrays and
6889 -- designated types of access types. This processing must also
6890 -- include the index types of arrays which we take care of here.
6897 Indx := First_Index (T);
6898 while Present (Indx) loop
6899 Typ := Base_Type (Etype (Indx));
6901 if Is_Private_Type (Typ)
6902 and then Present (Full_View (Typ))
6911 elsif Is_Private_Type (T)
6912 and then Present (Full_View (T))
6913 and then Is_Array_Type (Full_View (T))
6914 and then Is_Private_Type (Component_Type (Full_View (T)))
6918 -- Finally, a non-private subtype may have a private base type, which
6919 -- must be exchanged for consistency. This can happen when a package
6920 -- body is instantiated, when the scope stack is empty but in fact
6921 -- the subtype and the base type are declared in an enclosing scope.
6923 -- Note that in this case we introduce an inconsistency in the view
6924 -- set, because we switch the base type BT, but there could be some
6925 -- private dependent subtypes of BT which remain unswitched. Such
6926 -- subtypes might need to be switched at a later point (see specific
6927 -- provision for that case in Switch_View).
6929 elsif not Is_Private_Type (T)
6930 and then not Has_Private_View (N)
6931 and then Is_Private_Type (BT)
6932 and then Present (Full_View (BT))
6933 and then not Is_Generic_Type (BT)
6934 and then not In_Open_Scopes (BT)
6936 Prepend_Elmt (Full_View (BT), Exchanged_Views);
6937 Exchange_Declarations (BT);
6940 end Check_Private_View;
6942 -----------------------------
6943 -- Check_Hidden_Primitives --
6944 -----------------------------
6946 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is
6949 Result : Elist_Id := No_Elist;
6952 if No (Assoc_List) then
6956 -- Traverse the list of associations between formals and actuals
6957 -- searching for renamings of tagged types
6959 Actual := First (Assoc_List);
6960 while Present (Actual) loop
6961 if Nkind (Actual) = N_Subtype_Declaration then
6962 Gen_T := Generic_Parent_Type (Actual);
6964 if Present (Gen_T) and then Is_Tagged_Type (Gen_T) then
6966 -- Traverse the list of primitives of the actual types
6967 -- searching for hidden primitives that are visible in the
6968 -- corresponding generic formal; leave them visible and
6969 -- append them to Result to restore their decoration later.
6971 Install_Hidden_Primitives
6972 (Prims_List => Result,
6974 Act_T => Entity (Subtype_Indication (Actual)));
6982 end Check_Hidden_Primitives;
6984 --------------------------
6985 -- Contains_Instance_Of --
6986 --------------------------
6988 function Contains_Instance_Of
6991 N : Node_Id) return Boolean
6999 -- Verify that there are no circular instantiations. We check whether
7000 -- the unit contains an instance of the current scope or some enclosing
7001 -- scope (in case one of the instances appears in a subunit). Longer
7002 -- circularities involving subunits might seem too pathological to
7003 -- consider, but they were not too pathological for the authors of
7004 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7005 -- enclosing generic scopes as containing an instance.
7008 -- Within a generic subprogram body, the scope is not generic, to
7009 -- allow for recursive subprograms. Use the declaration to determine
7010 -- whether this is a generic unit.
7012 if Ekind (Scop) = E_Generic_Package
7013 or else (Is_Subprogram (Scop)
7014 and then Nkind (Unit_Declaration_Node (Scop)) =
7015 N_Generic_Subprogram_Declaration)
7017 Elmt := First_Elmt (Inner_Instances (Inner));
7019 while Present (Elmt) loop
7020 if Node (Elmt) = Scop then
7021 Error_Msg_Node_2 := Inner;
7023 ("circular Instantiation: & instantiated within &!",
7027 elsif Node (Elmt) = Inner then
7030 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
7031 Error_Msg_Node_2 := Inner;
7033 ("circular Instantiation: & instantiated within &!",
7041 -- Indicate that Inner is being instantiated within Scop
7043 Append_Elmt (Inner, Inner_Instances (Scop));
7046 if Scop = Standard_Standard then
7049 Scop := Scope (Scop);
7054 end Contains_Instance_Of;
7056 -----------------------
7057 -- Copy_Generic_Node --
7058 -----------------------
7060 function Copy_Generic_Node
7062 Parent_Id : Node_Id;
7063 Instantiating : Boolean) return Node_Id
7068 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
7069 -- Check the given value of one of the Fields referenced by the current
7070 -- node to determine whether to copy it recursively. The field may hold
7071 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
7072 -- Char) in which case it need not be copied.
7074 procedure Copy_Descendants;
7075 -- Common utility for various nodes
7077 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
7078 -- Make copy of element list
7080 function Copy_Generic_List
7082 Parent_Id : Node_Id) return List_Id;
7083 -- Apply Copy_Node recursively to the members of a node list
7085 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
7086 -- True if an identifier is part of the defining program unit name of
7087 -- a child unit. The entity of such an identifier must be kept (for
7088 -- ASIS use) even though as the name of an enclosing generic it would
7089 -- otherwise not be preserved in the generic tree.
7091 ----------------------
7092 -- Copy_Descendants --
7093 ----------------------
7095 procedure Copy_Descendants is
7096 use Atree.Unchecked_Access;
7097 -- This code section is part of the implementation of an untyped
7098 -- tree traversal, so it needs direct access to node fields.
7101 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
7102 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
7103 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
7104 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
7105 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
7106 end Copy_Descendants;
7108 -----------------------------
7109 -- Copy_Generic_Descendant --
7110 -----------------------------
7112 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
7114 if D = Union_Id (Empty) then
7117 elsif D in Node_Range then
7119 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
7121 elsif D in List_Range then
7122 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
7124 elsif D in Elist_Range then
7125 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
7127 -- Nothing else is copyable (e.g. Uint values), return as is
7132 end Copy_Generic_Descendant;
7134 ------------------------
7135 -- Copy_Generic_Elist --
7136 ------------------------
7138 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
7145 M := First_Elmt (E);
7146 while Present (M) loop
7148 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
7157 end Copy_Generic_Elist;
7159 -----------------------
7160 -- Copy_Generic_List --
7161 -----------------------
7163 function Copy_Generic_List
7165 Parent_Id : Node_Id) return List_Id
7173 Set_Parent (New_L, Parent_Id);
7176 while Present (N) loop
7177 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
7186 end Copy_Generic_List;
7188 ---------------------------
7189 -- In_Defining_Unit_Name --
7190 ---------------------------
7192 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
7195 Present (Parent (Nam))
7196 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
7198 (Nkind (Parent (Nam)) = N_Expanded_Name
7199 and then In_Defining_Unit_Name (Parent (Nam))));
7200 end In_Defining_Unit_Name;
7202 -- Start of processing for Copy_Generic_Node
7209 New_N := New_Copy (N);
7211 -- Copy aspects if present
7213 if Has_Aspects (N) then
7214 Set_Has_Aspects (New_N, False);
7215 Set_Aspect_Specifications
7216 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id));
7219 if Instantiating then
7220 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
7223 if not Is_List_Member (N) then
7224 Set_Parent (New_N, Parent_Id);
7227 -- Special casing for identifiers and other entity names and operators
7229 if Nkind_In (New_N, N_Character_Literal,
7233 or else Nkind (New_N) in N_Op
7235 if not Instantiating then
7237 -- Link both nodes in order to assign subsequently the entity of
7238 -- the copy to the original node, in case this is a global
7241 Set_Associated_Node (N, New_N);
7243 -- If we are within an instantiation, this is a nested generic
7244 -- that has already been analyzed at the point of definition.
7245 -- We must preserve references that were global to the enclosing
7246 -- parent at that point. Other occurrences, whether global or
7247 -- local to the current generic, must be resolved anew, so we
7248 -- reset the entity in the generic copy. A global reference has a
7249 -- smaller depth than the parent, or else the same depth in case
7250 -- both are distinct compilation units.
7252 -- A child unit is implicitly declared within the enclosing parent
7253 -- but is in fact global to it, and must be preserved.
7255 -- It is also possible for Current_Instantiated_Parent to be
7256 -- defined, and for this not to be a nested generic, namely if
7257 -- the unit is loaded through Rtsfind. In that case, the entity of
7258 -- New_N is only a link to the associated node, and not a defining
7261 -- The entities for parent units in the defining_program_unit of a
7262 -- generic child unit are established when the context of the unit
7263 -- is first analyzed, before the generic copy is made. They are
7264 -- preserved in the copy for use in ASIS queries.
7266 Ent := Entity (New_N);
7268 if No (Current_Instantiated_Parent.Gen_Id) then
7270 or else Nkind (Ent) /= N_Defining_Identifier
7271 or else not In_Defining_Unit_Name (N)
7273 Set_Associated_Node (New_N, Empty);
7278 not Nkind_In (Ent, N_Defining_Identifier,
7279 N_Defining_Character_Literal,
7280 N_Defining_Operator_Symbol)
7281 or else No (Scope (Ent))
7283 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id
7284 and then not Is_Child_Unit (Ent))
7286 (Scope_Depth (Scope (Ent)) >
7287 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
7289 Get_Source_Unit (Ent) =
7290 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
7292 Set_Associated_Node (New_N, Empty);
7295 -- Case of instantiating identifier or some other name or operator
7298 -- If the associated node is still defined, the entity in it
7299 -- is global, and must be copied to the instance. If this copy
7300 -- is being made for a body to inline, it is applied to an
7301 -- instantiated tree, and the entity is already present and
7302 -- must be also preserved.
7305 Assoc : constant Node_Id := Get_Associated_Node (N);
7308 if Present (Assoc) then
7309 if Nkind (Assoc) = Nkind (N) then
7310 Set_Entity (New_N, Entity (Assoc));
7311 Check_Private_View (N);
7313 -- The node is a reference to a global type and acts as the
7314 -- subtype mark of a qualified expression created in order
7315 -- to aid resolution of accidental overloading in instances.
7316 -- Since N is a reference to a type, the Associated_Node of
7317 -- N denotes an entity rather than another identifier. See
7318 -- Qualify_Universal_Operands for details.
7320 elsif Nkind (N) = N_Identifier
7321 and then Nkind (Parent (N)) = N_Qualified_Expression
7322 and then Subtype_Mark (Parent (N)) = N
7323 and then Is_Qualified_Universal_Literal (Parent (N))
7325 Set_Entity (New_N, Assoc);
7327 -- The name in the call may be a selected component if the
7328 -- call has not been analyzed yet, as may be the case for
7329 -- pre/post conditions in a generic unit.
7331 elsif Nkind (Assoc) = N_Function_Call
7332 and then Is_Entity_Name (Name (Assoc))
7334 Set_Entity (New_N, Entity (Name (Assoc)));
7336 elsif Nkind_In (Assoc, N_Defining_Identifier,
7337 N_Defining_Character_Literal,
7338 N_Defining_Operator_Symbol)
7339 and then Expander_Active
7341 -- Inlining case: we are copying a tree that contains
7342 -- global entities, which are preserved in the copy to be
7343 -- used for subsequent inlining.
7348 Set_Entity (New_N, Empty);
7354 -- For expanded name, we must copy the Prefix and Selector_Name
7356 if Nkind (N) = N_Expanded_Name then
7358 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
7360 Set_Selector_Name (New_N,
7361 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
7363 -- For operators, we must copy the right operand
7365 elsif Nkind (N) in N_Op then
7366 Set_Right_Opnd (New_N,
7367 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
7369 -- And for binary operators, the left operand as well
7371 if Nkind (N) in N_Binary_Op then
7372 Set_Left_Opnd (New_N,
7373 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
7377 -- Establish a link between an entity from the generic template and the
7378 -- corresponding entity in the generic copy to be analyzed.
7380 elsif Nkind (N) in N_Entity then
7381 if not Instantiating then
7382 Set_Associated_Entity (N, New_N);
7385 -- Clear any existing link the copy may inherit from the replicated
7386 -- generic template entity.
7388 Set_Associated_Entity (New_N, Empty);
7390 -- Special casing for stubs
7392 elsif Nkind (N) in N_Body_Stub then
7394 -- In any case, we must copy the specification or defining
7395 -- identifier as appropriate.
7397 if Nkind (N) = N_Subprogram_Body_Stub then
7398 Set_Specification (New_N,
7399 Copy_Generic_Node (Specification (N), New_N, Instantiating));
7402 Set_Defining_Identifier (New_N,
7404 (Defining_Identifier (N), New_N, Instantiating));
7407 -- If we are not instantiating, then this is where we load and
7408 -- analyze subunits, i.e. at the point where the stub occurs. A
7409 -- more permissive system might defer this analysis to the point
7410 -- of instantiation, but this seems too complicated for now.
7412 if not Instantiating then
7414 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
7416 Unum : Unit_Number_Type;
7420 -- Make sure that, if it is a subunit of the main unit that is
7421 -- preprocessed and if -gnateG is specified, the preprocessed
7422 -- file will be written.
7424 Lib.Analysing_Subunit_Of_Main :=
7425 Lib.In_Extended_Main_Source_Unit (N);
7428 (Load_Name => Subunit_Name,
7432 Lib.Analysing_Subunit_Of_Main := False;
7434 -- If the proper body is not found, a warning message will be
7435 -- emitted when analyzing the stub, or later at the point of
7436 -- instantiation. Here we just leave the stub as is.
7438 if Unum = No_Unit then
7439 Subunits_Missing := True;
7440 goto Subunit_Not_Found;
7443 Subunit := Cunit (Unum);
7445 if Nkind (Unit (Subunit)) /= N_Subunit then
7447 ("found child unit instead of expected SEPARATE subunit",
7449 Error_Msg_Sloc := Sloc (N);
7450 Error_Msg_N ("\to complete stub #", Subunit);
7451 goto Subunit_Not_Found;
7454 -- We must create a generic copy of the subunit, in order to
7455 -- perform semantic analysis on it, and we must replace the
7456 -- stub in the original generic unit with the subunit, in order
7457 -- to preserve non-local references within.
7459 -- Only the proper body needs to be copied. Library_Unit and
7460 -- context clause are simply inherited by the generic copy.
7461 -- Note that the copy (which may be recursive if there are
7462 -- nested subunits) must be done first, before attaching it to
7463 -- the enclosing generic.
7467 (Proper_Body (Unit (Subunit)),
7468 Empty, Instantiating => False);
7470 -- Now place the original proper body in the original generic
7471 -- unit. This is a body, not a compilation unit.
7473 Rewrite (N, Proper_Body (Unit (Subunit)));
7474 Set_Is_Compilation_Unit (Defining_Entity (N), False);
7475 Set_Was_Originally_Stub (N);
7477 -- Finally replace the body of the subunit with its copy, and
7478 -- make this new subunit into the library unit of the generic
7479 -- copy, which does not have stubs any longer.
7481 Set_Proper_Body (Unit (Subunit), New_Body);
7482 Set_Library_Unit (New_N, Subunit);
7483 Inherit_Context (Unit (Subunit), N);
7486 -- If we are instantiating, this must be an error case, since
7487 -- otherwise we would have replaced the stub node by the proper body
7488 -- that corresponds. So just ignore it in the copy (i.e. we have
7489 -- copied it, and that is good enough).
7495 <<Subunit_Not_Found>> null;
7497 -- If the node is a compilation unit, it is the subunit of a stub, which
7498 -- has been loaded already (see code below). In this case, the library
7499 -- unit field of N points to the parent unit (which is a compilation
7500 -- unit) and need not (and cannot) be copied.
7502 -- When the proper body of the stub is analyzed, the library_unit link
7503 -- is used to establish the proper context (see sem_ch10).
7505 -- The other fields of a compilation unit are copied as usual
7507 elsif Nkind (N) = N_Compilation_Unit then
7509 -- This code can only be executed when not instantiating, because in
7510 -- the copy made for an instantiation, the compilation unit node has
7511 -- disappeared at the point that a stub is replaced by its proper
7514 pragma Assert (not Instantiating);
7516 Set_Context_Items (New_N,
7517 Copy_Generic_List (Context_Items (N), New_N));
7520 Copy_Generic_Node (Unit (N), New_N, False));
7522 Set_First_Inlined_Subprogram (New_N,
7524 (First_Inlined_Subprogram (N), New_N, False));
7526 Set_Aux_Decls_Node (New_N,
7527 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
7529 -- For an assignment node, the assignment is known to be semantically
7530 -- legal if we are instantiating the template. This avoids incorrect
7531 -- diagnostics in generated code.
7533 elsif Nkind (N) = N_Assignment_Statement then
7535 -- Copy name and expression fields in usual manner
7538 Copy_Generic_Node (Name (N), New_N, Instantiating));
7540 Set_Expression (New_N,
7541 Copy_Generic_Node (Expression (N), New_N, Instantiating));
7543 if Instantiating then
7544 Set_Assignment_OK (Name (New_N), True);
7547 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
7548 if not Instantiating then
7549 Set_Associated_Node (N, New_N);
7552 if Present (Get_Associated_Node (N))
7553 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
7555 -- In the generic the aggregate has some composite type. If at
7556 -- the point of instantiation the type has a private view,
7557 -- install the full view (and that of its ancestors, if any).
7560 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
7564 if Present (T) and then Is_Private_Type (T) then
7569 and then Is_Tagged_Type (T)
7570 and then Is_Derived_Type (T)
7572 Rt := Root_Type (T);
7577 if Is_Private_Type (T) then
7588 -- Do not copy the associated node, which points to the generic copy
7589 -- of the aggregate.
7592 use Atree.Unchecked_Access;
7593 -- This code section is part of the implementation of an untyped
7594 -- tree traversal, so it needs direct access to node fields.
7597 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
7598 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
7599 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
7600 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
7603 -- Allocators do not have an identifier denoting the access type, so we
7604 -- must locate it through the expression to check whether the views are
7607 elsif Nkind (N) = N_Allocator
7608 and then Nkind (Expression (N)) = N_Qualified_Expression
7609 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
7610 and then Instantiating
7613 T : constant Node_Id :=
7614 Get_Associated_Node (Subtype_Mark (Expression (N)));
7620 -- Retrieve the allocator node in the generic copy
7622 Acc_T := Etype (Parent (Parent (T)));
7624 if Present (Acc_T) and then Is_Private_Type (Acc_T) then
7625 Switch_View (Acc_T);
7632 -- For a proper body, we must catch the case of a proper body that
7633 -- replaces a stub. This represents the point at which a separate
7634 -- compilation unit, and hence template file, may be referenced, so we
7635 -- must make a new source instantiation entry for the template of the
7636 -- subunit, and ensure that all nodes in the subunit are adjusted using
7637 -- this new source instantiation entry.
7639 elsif Nkind (N) in N_Proper_Body then
7641 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
7644 if Instantiating and then Was_Originally_Stub (N) then
7645 Create_Instantiation_Source
7646 (Instantiation_Node,
7647 Defining_Entity (N),
7651 -- Now copy the fields of the proper body, using the new
7652 -- adjustment factor if one was needed as per test above.
7656 -- Restore the original adjustment factor in case changed
7658 S_Adjustment := Save_Adjustment;
7661 elsif Nkind (N) = N_Pragma and then Instantiating then
7663 -- Do not copy Comment or Ident pragmas their content is relevant to
7664 -- the generic unit, not to the instantiating unit.
7666 if Nam_In (Pragma_Name (N), Name_Comment, Name_Ident) then
7667 New_N := Make_Null_Statement (Sloc (N));
7669 -- Do not copy pragmas generated from aspects because the pragmas do
7670 -- not carry any semantic information, plus they will be regenerated
7673 -- However, generating C we need to copy them since postconditions
7674 -- are inlined by the front end, and the front-end inlining machinery
7675 -- relies on this routine to perform inlining.
7677 elsif From_Aspect_Specification (N)
7678 and then not Modify_Tree_For_C
7680 New_N := Make_Null_Statement (Sloc (N));
7686 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then
7688 -- No descendant fields need traversing
7692 elsif Nkind (N) = N_String_Literal
7693 and then Present (Etype (N))
7694 and then Instantiating
7696 -- If the string is declared in an outer scope, the string_literal
7697 -- subtype created for it may have the wrong scope. Force reanalysis
7698 -- of the constant to generate a new itype in the proper context.
7700 Set_Etype (New_N, Empty);
7701 Set_Analyzed (New_N, False);
7703 -- For the remaining nodes, copy their descendants recursively
7708 if Instantiating and then Nkind (N) = N_Subprogram_Body then
7709 Set_Generic_Parent (Specification (New_N), N);
7711 -- Should preserve Corresponding_Spec??? (12.3(14))
7715 -- Propagate dimensions if present, so that they are reflected in the
7718 if Nkind (N) in N_Has_Etype
7719 and then (Nkind (N) in N_Op or else Is_Entity_Name (N))
7720 and then Present (Etype (N))
7721 and then Is_Floating_Point_Type (Etype (N))
7722 and then Has_Dimension_System (Etype (N))
7724 Copy_Dimensions (N, New_N);
7728 end Copy_Generic_Node;
7730 ----------------------------
7731 -- Denotes_Formal_Package --
7732 ----------------------------
7734 function Denotes_Formal_Package
7736 On_Exit : Boolean := False;
7737 Instance : Entity_Id := Empty) return Boolean
7740 Scop : constant Entity_Id := Scope (Pack);
7743 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean;
7744 -- The package in question may be an actual for a previous formal
7745 -- package P of the current instance, so examine its actuals as well.
7746 -- This must be recursive over other formal packages.
7748 ----------------------------------
7749 -- Is_Actual_Of_Previous_Formal --
7750 ----------------------------------
7752 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is
7756 E1 := First_Entity (P);
7757 while Present (E1) and then E1 /= Instance loop
7758 if Ekind (E1) = E_Package
7759 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration
7761 if Renamed_Object (E1) = Pack then
7764 elsif E1 = P or else Renamed_Object (E1) = P then
7767 elsif Is_Actual_Of_Previous_Formal (E1) then
7776 end Is_Actual_Of_Previous_Formal;
7778 -- Start of processing for Denotes_Formal_Package
7784 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
7786 Par := Current_Instantiated_Parent.Act_Id;
7789 if Ekind (Scop) = E_Generic_Package
7790 or else Nkind (Unit_Declaration_Node (Scop)) =
7791 N_Generic_Subprogram_Declaration
7795 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) =
7796 N_Formal_Package_Declaration
7804 -- Check whether this package is associated with a formal package of
7805 -- the enclosing instantiation. Iterate over the list of renamings.
7807 E := First_Entity (Par);
7808 while Present (E) loop
7809 if Ekind (E) /= E_Package
7810 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
7814 elsif Renamed_Object (E) = Par then
7817 elsif Renamed_Object (E) = Pack then
7820 elsif Is_Actual_Of_Previous_Formal (E) then
7830 end Denotes_Formal_Package;
7836 procedure End_Generic is
7838 -- ??? More things could be factored out in this routine. Should
7839 -- probably be done at a later stage.
7841 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
7842 Generic_Flags.Decrement_Last;
7844 Expander_Mode_Restore;
7851 function Earlier (N1, N2 : Node_Id) return Boolean is
7852 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
7853 -- Find distance from given node to enclosing compilation unit
7859 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
7862 and then Nkind (P) /= N_Compilation_Unit
7864 P := True_Parent (P);
7869 -- Local declarations
7878 -- Start of processing for Earlier
7881 Find_Depth (P1, D1);
7882 Find_Depth (P2, D2);
7892 P1 := True_Parent (P1);
7897 P2 := True_Parent (P2);
7901 -- At this point P1 and P2 are at the same distance from the root.
7902 -- We examine their parents until we find a common declarative list.
7903 -- If we reach the root, N1 and N2 do not descend from the same
7904 -- declarative list (e.g. one is nested in the declarative part and
7905 -- the other is in a block in the statement part) and the earlier
7906 -- one is already frozen.
7908 while not Is_List_Member (P1)
7909 or else not Is_List_Member (P2)
7910 or else List_Containing (P1) /= List_Containing (P2)
7912 P1 := True_Parent (P1);
7913 P2 := True_Parent (P2);
7915 if Nkind (Parent (P1)) = N_Subunit then
7916 P1 := Corresponding_Stub (Parent (P1));
7919 if Nkind (Parent (P2)) = N_Subunit then
7920 P2 := Corresponding_Stub (Parent (P2));
7928 -- Expanded code usually shares the source location of the original
7929 -- construct it was generated for. This however may not necessarily
7930 -- reflect the true location of the code within the tree.
7932 -- Before comparing the slocs of the two nodes, make sure that we are
7933 -- working with correct source locations. Assume that P1 is to the left
7934 -- of P2. If either one does not come from source, traverse the common
7935 -- list heading towards the other node and locate the first source
7939 -- ----+===+===+--------------+===+===+----
7940 -- expanded code expanded code
7942 if not Comes_From_Source (P1) then
7943 while Present (P1) loop
7945 -- Neither P2 nor a source statement were located during the
7946 -- search. If we reach the end of the list, then P1 does not
7947 -- occur earlier than P2.
7950 -- start --- P2 ----- P1 --- end
7952 if No (Next (P1)) then
7955 -- We encounter P2 while going to the right of the list. This
7956 -- means that P1 does indeed appear earlier.
7959 -- start --- P1 ===== P2 --- end
7960 -- expanded code in between
7965 -- No need to look any further since we have located a source
7968 elsif Comes_From_Source (P1) then
7978 if not Comes_From_Source (P2) then
7979 while Present (P2) loop
7981 -- Neither P1 nor a source statement were located during the
7982 -- search. If we reach the start of the list, then P1 does not
7983 -- occur earlier than P2.
7986 -- start --- P2 --- P1 --- end
7988 if No (Prev (P2)) then
7991 -- We encounter P1 while going to the left of the list. This
7992 -- means that P1 does indeed appear earlier.
7995 -- start --- P1 ===== P2 --- end
7996 -- expanded code in between
8001 -- No need to look any further since we have located a source
8004 elsif Comes_From_Source (P2) then
8014 -- At this point either both nodes came from source or we approximated
8015 -- their source locations through neighboring source statements.
8017 T1 := Top_Level_Location (Sloc (P1));
8018 T2 := Top_Level_Location (Sloc (P2));
8020 -- When two nodes come from the same instance, they have identical top
8021 -- level locations. To determine proper relation within the tree, check
8022 -- their locations within the template.
8025 return Sloc (P1) < Sloc (P2);
8027 -- The two nodes either come from unrelated instances or do not come
8028 -- from instantiated code at all.
8035 ----------------------
8036 -- Find_Actual_Type --
8037 ----------------------
8039 function Find_Actual_Type
8041 Gen_Type : Entity_Id) return Entity_Id
8043 Gen_Scope : constant Entity_Id := Scope (Gen_Type);
8047 -- Special processing only applies to child units
8049 if not Is_Child_Unit (Gen_Scope) then
8050 return Get_Instance_Of (Typ);
8052 -- If designated or component type is itself a formal of the child unit,
8053 -- its instance is available.
8055 elsif Scope (Typ) = Gen_Scope then
8056 return Get_Instance_Of (Typ);
8058 -- If the array or access type is not declared in the parent unit,
8059 -- no special processing needed.
8061 elsif not Is_Generic_Type (Typ)
8062 and then Scope (Gen_Scope) /= Scope (Typ)
8064 return Get_Instance_Of (Typ);
8066 -- Otherwise, retrieve designated or component type by visibility
8069 T := Current_Entity (Typ);
8070 while Present (T) loop
8071 if In_Open_Scopes (Scope (T)) then
8073 elsif Is_Generic_Actual_Type (T) then
8082 end Find_Actual_Type;
8084 ----------------------------
8085 -- Freeze_Subprogram_Body --
8086 ----------------------------
8088 procedure Freeze_Subprogram_Body
8089 (Inst_Node : Node_Id;
8091 Pack_Id : Entity_Id)
8093 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
8094 Par : constant Entity_Id := Scope (Gen_Unit);
8100 function Enclosing_Package_Body (N : Node_Id) return Node_Id;
8101 -- Find innermost package body that encloses the given node, and which
8102 -- is not a compilation unit. Freeze nodes for the instance, or for its
8103 -- enclosing body, may be inserted after the enclosing_body of the
8104 -- generic unit. Used to determine proper placement of freeze node for
8105 -- both package and subprogram instances.
8107 function Package_Freeze_Node (B : Node_Id) return Node_Id;
8108 -- Find entity for given package body, and locate or create a freeze
8111 ----------------------------
8112 -- Enclosing_Package_Body --
8113 ----------------------------
8115 function Enclosing_Package_Body (N : Node_Id) return Node_Id is
8121 and then Nkind (Parent (P)) /= N_Compilation_Unit
8123 if Nkind (P) = N_Package_Body then
8124 if Nkind (Parent (P)) = N_Subunit then
8125 return Corresponding_Stub (Parent (P));
8131 P := True_Parent (P);
8135 end Enclosing_Package_Body;
8137 -------------------------
8138 -- Package_Freeze_Node --
8139 -------------------------
8141 function Package_Freeze_Node (B : Node_Id) return Node_Id is
8145 if Nkind (B) = N_Package_Body then
8146 Id := Corresponding_Spec (B);
8147 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
8148 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
8151 Ensure_Freeze_Node (Id);
8152 return Freeze_Node (Id);
8153 end Package_Freeze_Node;
8155 -- Start of processing for Freeze_Subprogram_Body
8158 -- If the instance and the generic body appear within the same unit, and
8159 -- the instance precedes the generic, the freeze node for the instance
8160 -- must appear after that of the generic. If the generic is nested
8161 -- within another instance I2, then current instance must be frozen
8162 -- after I2. In both cases, the freeze nodes are those of enclosing
8163 -- packages. Otherwise, the freeze node is placed at the end of the
8164 -- current declarative part.
8166 Enc_G := Enclosing_Package_Body (Gen_Body);
8167 Enc_I := Enclosing_Package_Body (Inst_Node);
8168 Ensure_Freeze_Node (Pack_Id);
8169 F_Node := Freeze_Node (Pack_Id);
8171 if Is_Generic_Instance (Par)
8172 and then Present (Freeze_Node (Par))
8173 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
8175 -- The parent was a premature instantiation. Insert freeze node at
8176 -- the end the current declarative part.
8178 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
8179 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
8181 -- Handle the following case:
8183 -- package Parent_Inst is new ...
8186 -- procedure P ... -- this body freezes Parent_Inst
8188 -- package Inst is new ...
8190 -- In this particular scenario, the freeze node for Inst must be
8191 -- inserted in the same manner as that of Parent_Inst - before the
8192 -- next source body or at the end of the declarative list (body not
8193 -- available). If body P did not exist and Parent_Inst was frozen
8194 -- after Inst, either by a body following Inst or at the end of the
8195 -- declarative region, the freeze node for Inst must be inserted
8196 -- after that of Parent_Inst. This relation is established by
8197 -- comparing the Slocs of Parent_Inst freeze node and Inst.
8199 elsif List_Containing (Get_Package_Instantiation_Node (Par)) =
8200 List_Containing (Inst_Node)
8201 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node)
8203 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
8206 Insert_After (Freeze_Node (Par), F_Node);
8209 -- The body enclosing the instance should be frozen after the body that
8210 -- includes the generic, because the body of the instance may make
8211 -- references to entities therein. If the two are not in the same
8212 -- declarative part, or if the one enclosing the instance is frozen
8213 -- already, freeze the instance at the end of the current declarative
8216 elsif Is_Generic_Instance (Par)
8217 and then Present (Freeze_Node (Par))
8218 and then Present (Enc_I)
8220 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
8222 (Nkind (Enc_I) = N_Package_Body
8224 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
8226 -- The enclosing package may contain several instances. Rather
8227 -- than computing the earliest point at which to insert its freeze
8228 -- node, we place it at the end of the declarative part of the
8229 -- parent of the generic.
8231 Insert_Freeze_Node_For_Instance
8232 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
8235 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
8237 elsif Present (Enc_G)
8238 and then Present (Enc_I)
8239 and then Enc_G /= Enc_I
8240 and then Earlier (Inst_Node, Gen_Body)
8242 if Nkind (Enc_G) = N_Package_Body then
8244 Corresponding_Spec (Enc_G);
8245 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
8247 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
8250 -- Freeze package that encloses instance, and place node after the
8251 -- package that encloses generic. If enclosing package is already
8252 -- frozen we have to assume it is at the proper place. This may be a
8253 -- potential ABE that requires dynamic checking. Do not add a freeze
8254 -- node if the package that encloses the generic is inside the body
8255 -- that encloses the instance, because the freeze node would be in
8256 -- the wrong scope. Additional contortions needed if the bodies are
8257 -- within a subunit.
8260 Enclosing_Body : Node_Id;
8263 if Nkind (Enc_I) = N_Package_Body_Stub then
8264 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I)));
8266 Enclosing_Body := Enc_I;
8269 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then
8270 Insert_Freeze_Node_For_Instance
8271 (Enc_G, Package_Freeze_Node (Enc_I));
8275 -- Freeze enclosing subunit before instance
8277 Ensure_Freeze_Node (E_G_Id);
8279 if not Is_List_Member (Freeze_Node (E_G_Id)) then
8280 Insert_After (Enc_G, Freeze_Node (E_G_Id));
8283 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
8286 -- If none of the above, insert freeze node at the end of the current
8287 -- declarative part.
8289 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node);
8291 end Freeze_Subprogram_Body;
8297 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
8299 return Generic_Renamings.Table (E).Gen_Id;
8302 ---------------------
8303 -- Get_Instance_Of --
8304 ---------------------
8306 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
8307 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
8310 if Res /= Assoc_Null then
8311 return Generic_Renamings.Table (Res).Act_Id;
8314 -- On exit, entity is not instantiated: not a generic parameter, or
8315 -- else parameter of an inner generic unit.
8319 end Get_Instance_Of;
8321 ------------------------------------
8322 -- Get_Package_Instantiation_Node --
8323 ------------------------------------
8325 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
8326 Decl : Node_Id := Unit_Declaration_Node (A);
8330 -- If the Package_Instantiation attribute has been set on the package
8331 -- entity, then use it directly when it (or its Original_Node) refers
8332 -- to an N_Package_Instantiation node. In principle it should be
8333 -- possible to have this field set in all cases, which should be
8334 -- investigated, and would allow this function to be significantly
8337 Inst := Package_Instantiation (A);
8339 if Present (Inst) then
8340 if Nkind (Inst) = N_Package_Instantiation then
8343 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then
8344 return Original_Node (Inst);
8348 -- If the instantiation is a compilation unit that does not need body
8349 -- then the instantiation node has been rewritten as a package
8350 -- declaration for the instance, and we return the original node.
8352 -- If it is a compilation unit and the instance node has not been
8353 -- rewritten, then it is still the unit of the compilation. Finally, if
8354 -- a body is present, this is a parent of the main unit whose body has
8355 -- been compiled for inlining purposes, and the instantiation node has
8356 -- been rewritten with the instance body.
8358 -- Otherwise the instantiation node appears after the declaration. If
8359 -- the entity is a formal package, the declaration may have been
8360 -- rewritten as a generic declaration (in the case of a formal with box)
8361 -- or left as a formal package declaration if it has actuals, and is
8362 -- found with a forward search.
8364 if Nkind (Parent (Decl)) = N_Compilation_Unit then
8365 if Nkind (Decl) = N_Package_Declaration
8366 and then Present (Corresponding_Body (Decl))
8368 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
8371 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
8372 return Original_Node (Decl);
8374 return Unit (Parent (Decl));
8377 elsif Nkind (Decl) = N_Package_Declaration
8378 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
8380 return Original_Node (Decl);
8383 Inst := Next (Decl);
8384 while not Nkind_In (Inst, N_Package_Instantiation,
8385 N_Formal_Package_Declaration)
8392 end Get_Package_Instantiation_Node;
8394 ------------------------
8395 -- Has_Been_Exchanged --
8396 ------------------------
8398 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
8402 Next := First_Elmt (Exchanged_Views);
8403 while Present (Next) loop
8404 if Full_View (Node (Next)) = E then
8412 end Has_Been_Exchanged;
8418 function Hash (F : Entity_Id) return HTable_Range is
8420 return HTable_Range (F mod HTable_Size);
8423 ------------------------
8424 -- Hide_Current_Scope --
8425 ------------------------
8427 procedure Hide_Current_Scope is
8428 C : constant Entity_Id := Current_Scope;
8432 Set_Is_Hidden_Open_Scope (C);
8434 E := First_Entity (C);
8435 while Present (E) loop
8436 if Is_Immediately_Visible (E) then
8437 Set_Is_Immediately_Visible (E, False);
8438 Append_Elmt (E, Hidden_Entities);
8444 -- Make the scope name invisible as well. This is necessary, but might
8445 -- conflict with calls to Rtsfind later on, in case the scope is a
8446 -- predefined one. There is no clean solution to this problem, so for
8447 -- now we depend on the user not redefining Standard itself in one of
8448 -- the parent units.
8450 if Is_Immediately_Visible (C) and then C /= Standard_Standard then
8451 Set_Is_Immediately_Visible (C, False);
8452 Append_Elmt (C, Hidden_Entities);
8455 end Hide_Current_Scope;
8461 procedure Init_Env is
8462 Saved : Instance_Env;
8465 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8466 Saved.Exchanged_Views := Exchanged_Views;
8467 Saved.Hidden_Entities := Hidden_Entities;
8468 Saved.Current_Sem_Unit := Current_Sem_Unit;
8469 Saved.Parent_Unit_Visible := Parent_Unit_Visible;
8470 Saved.Instance_Parent_Unit := Instance_Parent_Unit;
8472 -- Save configuration switches. These may be reset if the unit is a
8473 -- predefined unit, and the current mode is not Ada 2005.
8475 Save_Opt_Config_Switches (Saved.Switches);
8477 Instance_Envs.Append (Saved);
8479 Exchanged_Views := New_Elmt_List;
8480 Hidden_Entities := New_Elmt_List;
8482 -- Make dummy entry for Instantiated parent. If generic unit is legal,
8483 -- this is set properly in Set_Instance_Env.
8485 Current_Instantiated_Parent :=
8486 (Current_Scope, Current_Scope, Assoc_Null);
8489 ------------------------------
8490 -- In_Same_Declarative_Part --
8491 ------------------------------
8493 function In_Same_Declarative_Part
8495 Inst : Node_Id) return Boolean
8497 Decls : constant Node_Id := Parent (F_Node);
8501 Nod := Parent (Inst);
8502 while Present (Nod) loop
8506 elsif Nkind_In (Nod, N_Subprogram_Body,
8508 N_Package_Declaration,
8515 elsif Nkind (Nod) = N_Subunit then
8516 Nod := Corresponding_Stub (Nod);
8518 elsif Nkind (Nod) = N_Compilation_Unit then
8522 Nod := Parent (Nod);
8527 end In_Same_Declarative_Part;
8529 ---------------------
8530 -- In_Main_Context --
8531 ---------------------
8533 function In_Main_Context (E : Entity_Id) return Boolean is
8539 if not Is_Compilation_Unit (E)
8540 or else Ekind (E) /= E_Package
8541 or else In_Private_Part (E)
8546 Context := Context_Items (Cunit (Main_Unit));
8548 Clause := First (Context);
8549 while Present (Clause) loop
8550 if Nkind (Clause) = N_With_Clause then
8551 Nam := Name (Clause);
8553 -- If the current scope is part of the context of the main unit,
8554 -- analysis of the corresponding with_clause is not complete, and
8555 -- the entity is not set. We use the Chars field directly, which
8556 -- might produce false positives in rare cases, but guarantees
8557 -- that we produce all the instance bodies we will need.
8559 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E))
8560 or else (Nkind (Nam) = N_Selected_Component
8561 and then Chars (Selector_Name (Nam)) = Chars (E))
8571 end In_Main_Context;
8573 ---------------------
8574 -- Inherit_Context --
8575 ---------------------
8577 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
8578 Current_Context : List_Id;
8579 Current_Unit : Node_Id;
8588 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
8590 -- The inherited context is attached to the enclosing compilation
8591 -- unit. This is either the main unit, or the declaration for the
8592 -- main unit (in case the instantiation appears within the package
8593 -- declaration and the main unit is its body).
8595 Current_Unit := Parent (Inst);
8596 while Present (Current_Unit)
8597 and then Nkind (Current_Unit) /= N_Compilation_Unit
8599 Current_Unit := Parent (Current_Unit);
8602 Current_Context := Context_Items (Current_Unit);
8604 Item := First (Context_Items (Parent (Gen_Decl)));
8605 while Present (Item) loop
8606 if Nkind (Item) = N_With_Clause then
8607 Lib_Unit := Library_Unit (Item);
8609 -- Take care to prevent direct cyclic with's
8611 if Lib_Unit /= Current_Unit then
8613 -- Do not add a unit if it is already in the context
8615 Clause := First (Current_Context);
8617 while Present (Clause) loop
8618 if Nkind (Clause) = N_With_Clause and then
8619 Library_Unit (Clause) = Lib_Unit
8629 New_I := New_Copy (Item);
8630 Set_Implicit_With (New_I, True);
8631 Set_Implicit_With_From_Instantiation (New_I, True);
8632 Append (New_I, Current_Context);
8640 end Inherit_Context;
8646 procedure Initialize is
8648 Generic_Renamings.Init;
8651 Generic_Renamings_HTable.Reset;
8652 Circularity_Detected := False;
8653 Exchanged_Views := No_Elist;
8654 Hidden_Entities := No_Elist;
8657 -------------------------------------
8658 -- Insert_Freeze_Node_For_Instance --
8659 -------------------------------------
8661 procedure Insert_Freeze_Node_For_Instance
8670 function Enclosing_Body (N : Node_Id) return Node_Id;
8671 -- Find enclosing package or subprogram body, if any. Freeze node may
8672 -- be placed at end of current declarative list if previous instance
8673 -- and current one have different enclosing bodies.
8675 function Previous_Instance (Gen : Entity_Id) return Entity_Id;
8676 -- Find the local instance, if any, that declares the generic that is
8677 -- being instantiated. If present, the freeze node for this instance
8678 -- must follow the freeze node for the previous instance.
8680 --------------------
8681 -- Enclosing_Body --
8682 --------------------
8684 function Enclosing_Body (N : Node_Id) return Node_Id is
8690 and then Nkind (Parent (P)) /= N_Compilation_Unit
8692 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then
8693 if Nkind (Parent (P)) = N_Subunit then
8694 return Corresponding_Stub (Parent (P));
8700 P := True_Parent (P);
8706 -----------------------
8707 -- Previous_Instance --
8708 -----------------------
8710 function Previous_Instance (Gen : Entity_Id) return Entity_Id is
8715 while Present (S) and then S /= Standard_Standard loop
8716 if Is_Generic_Instance (S)
8717 and then In_Same_Source_Unit (S, N)
8726 end Previous_Instance;
8728 -- Start of processing for Insert_Freeze_Node_For_Instance
8731 if not Is_List_Member (F_Node) then
8733 Decls := List_Containing (N);
8734 Inst := Entity (F_Node);
8735 Par_N := Parent (Decls);
8737 -- When processing a subprogram instantiation, utilize the actual
8738 -- subprogram instantiation rather than its package wrapper as it
8739 -- carries all the context information.
8741 if Is_Wrapper_Package (Inst) then
8742 Inst := Related_Instance (Inst);
8745 -- If this is a package instance, check whether the generic is
8746 -- declared in a previous instance and the current instance is
8747 -- not within the previous one.
8749 if Present (Generic_Parent (Parent (Inst)))
8750 and then Is_In_Main_Unit (N)
8753 Enclosing_N : constant Node_Id := Enclosing_Body (N);
8754 Par_I : constant Entity_Id :=
8756 (Generic_Parent (Parent (Inst)));
8761 and then Earlier (N, Freeze_Node (Par_I))
8763 Scop := Scope (Inst);
8765 -- If the current instance is within the one that contains
8766 -- the generic, the freeze node for the current one must
8767 -- appear in the current declarative part. Ditto, if the
8768 -- current instance is within another package instance or
8769 -- within a body that does not enclose the current instance.
8770 -- In these three cases the freeze node of the previous
8771 -- instance is not relevant.
8773 while Present (Scop) and then Scop /= Standard_Standard loop
8774 exit when Scop = Par_I
8776 (Is_Generic_Instance (Scop)
8777 and then Scope_Depth (Scop) > Scope_Depth (Par_I));
8778 Scop := Scope (Scop);
8781 -- Previous instance encloses current instance
8783 if Scop = Par_I then
8786 -- If the next node is a source body we must freeze in
8787 -- the current scope as well.
8789 elsif Present (Next (N))
8790 and then Nkind_In (Next (N), N_Subprogram_Body,
8792 and then Comes_From_Source (Next (N))
8796 -- Current instance is within an unrelated instance
8798 elsif Is_Generic_Instance (Scop) then
8801 -- Current instance is within an unrelated body
8803 elsif Present (Enclosing_N)
8804 and then Enclosing_N /= Enclosing_Body (Par_I)
8809 Insert_After (Freeze_Node (Par_I), F_Node);
8816 -- When the instantiation occurs in a package declaration, append the
8817 -- freeze node to the private declarations (if any).
8819 if Nkind (Par_N) = N_Package_Specification
8820 and then Decls = Visible_Declarations (Par_N)
8821 and then Present (Private_Declarations (Par_N))
8822 and then not Is_Empty_List (Private_Declarations (Par_N))
8824 Decls := Private_Declarations (Par_N);
8825 Decl := First (Decls);
8828 -- Determine the proper freeze point of a package instantiation. We
8829 -- adhere to the general rule of a package or subprogram body causing
8830 -- freezing of anything before it in the same declarative region. In
8831 -- this case, the proper freeze point of a package instantiation is
8832 -- before the first source body which follows, or before a stub. This
8833 -- ensures that entities coming from the instance are already frozen
8834 -- and usable in source bodies.
8836 if Nkind (Par_N) /= N_Package_Declaration
8837 and then Ekind (Inst) = E_Package
8838 and then Is_Generic_Instance (Inst)
8840 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst)
8842 while Present (Decl) loop
8843 if (Nkind (Decl) in N_Unit_Body
8845 Nkind (Decl) in N_Body_Stub)
8846 and then Comes_From_Source (Decl)
8848 Insert_Before (Decl, F_Node);
8856 -- In a package declaration, or if no previous body, insert at end
8859 Set_Sloc (F_Node, Sloc (Last (Decls)));
8860 Insert_After (Last (Decls), F_Node);
8862 end Insert_Freeze_Node_For_Instance;
8868 procedure Install_Body
8869 (Act_Body : Node_Id;
8874 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
8875 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
8876 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
8877 Par : constant Entity_Id := Scope (Gen_Id);
8878 Gen_Unit : constant Node_Id :=
8879 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
8880 Orig_Body : Node_Id := Gen_Body;
8882 Body_Unit : Node_Id;
8884 Must_Delay : Boolean;
8886 function In_Same_Enclosing_Subp return Boolean;
8887 -- Check whether instance and generic body are within same subprogram.
8889 function True_Sloc (N : Node_Id) return Source_Ptr;
8890 -- If the instance is nested inside a generic unit, the Sloc of the
8891 -- instance indicates the place of the original definition, not the
8892 -- point of the current enclosing instance. Pending a better usage of
8893 -- Slocs to indicate instantiation places, we determine the place of
8894 -- origin of a node by finding the maximum sloc of any ancestor node.
8895 -- Why is this not equivalent to Top_Level_Location ???
8897 ----------------------------
8898 -- In_Same_Enclosing_Subp --
8899 ----------------------------
8901 function In_Same_Enclosing_Subp return Boolean is
8906 Scop := Scope (Act_Id);
8907 while Scop /= Standard_Standard
8908 and then not Is_Overloadable (Scop)
8910 Scop := Scope (Scop);
8913 if Scop = Standard_Standard then
8919 Scop := Scope (Gen_Id);
8920 while Scop /= Standard_Standard loop
8924 Scop := Scope (Scop);
8929 end In_Same_Enclosing_Subp;
8935 function True_Sloc (N : Node_Id) return Source_Ptr is
8942 while Present (N1) and then N1 /= Act_Unit loop
8943 if Sloc (N1) > Res then
8953 -- Start of processing for Install_Body
8956 -- Handle first the case of an instance with incomplete actual types.
8957 -- The instance body cannot be placed after the declaration because
8958 -- full views have not been seen yet. Any use of the non-limited views
8959 -- in the instance body requires the presence of a regular with_clause
8960 -- in the enclosing unit, and will fail if this with_clause is missing.
8961 -- We place the instance body at the beginning of the enclosing body,
8962 -- which is the unit being compiled. The freeze node for the instance
8963 -- is then placed after the instance body.
8965 if not Is_Empty_Elmt_List (Incomplete_Actuals (Act_Id))
8966 and then Expander_Active
8967 and then Ekind (Scope (Act_Id)) = E_Package
8970 Scop : constant Entity_Id := Scope (Act_Id);
8971 Body_Id : constant Node_Id :=
8972 Corresponding_Body (Unit_Declaration_Node (Scop));
8975 Ensure_Freeze_Node (Act_Id);
8976 F_Node := Freeze_Node (Act_Id);
8977 if Present (Body_Id) then
8978 Set_Is_Frozen (Act_Id, False);
8979 Prepend (Act_Body, Declarations (Parent (Body_Id)));
8980 if Is_List_Member (F_Node) then
8984 Insert_After (Act_Body, F_Node);
8990 -- If the body is a subunit, the freeze point is the corresponding stub
8991 -- in the current compilation, not the subunit itself.
8993 if Nkind (Parent (Gen_Body)) = N_Subunit then
8994 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
8996 Orig_Body := Gen_Body;
8999 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
9001 -- If the instantiation and the generic definition appear in the same
9002 -- package declaration, this is an early instantiation. If they appear
9003 -- in the same declarative part, it is an early instantiation only if
9004 -- the generic body appears textually later, and the generic body is
9005 -- also in the main unit.
9007 -- If instance is nested within a subprogram, and the generic body
9008 -- is not, the instance is delayed because the enclosing body is. If
9009 -- instance and body are within the same scope, or the same subprogram
9010 -- body, indicate explicitly that the instance is delayed.
9013 (Gen_Unit = Act_Unit
9014 and then (Nkind_In (Gen_Unit, N_Package_Declaration,
9015 N_Generic_Package_Declaration)
9016 or else (Gen_Unit = Body_Unit
9017 and then True_Sloc (N) < Sloc (Orig_Body)))
9018 and then Is_In_Main_Unit (Gen_Unit)
9019 and then (Scope (Act_Id) = Scope (Gen_Id)
9020 or else In_Same_Enclosing_Subp));
9022 -- If this is an early instantiation, the freeze node is placed after
9023 -- the generic body. Otherwise, if the generic appears in an instance,
9024 -- we cannot freeze the current instance until the outer one is frozen.
9025 -- This is only relevant if the current instance is nested within some
9026 -- inner scope not itself within the outer instance. If this scope is
9027 -- a package body in the same declarative part as the outer instance,
9028 -- then that body needs to be frozen after the outer instance. Finally,
9029 -- if no delay is needed, we place the freeze node at the end of the
9030 -- current declarative part.
9032 if Expander_Active then
9033 Ensure_Freeze_Node (Act_Id);
9034 F_Node := Freeze_Node (Act_Id);
9037 Insert_After (Orig_Body, F_Node);
9039 elsif Is_Generic_Instance (Par)
9040 and then Present (Freeze_Node (Par))
9041 and then Scope (Act_Id) /= Par
9043 -- Freeze instance of inner generic after instance of enclosing
9046 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
9048 -- Handle the following case:
9050 -- package Parent_Inst is new ...
9053 -- procedure P ... -- this body freezes Parent_Inst
9055 -- package Inst is new ...
9057 -- In this particular scenario, the freeze node for Inst must
9058 -- be inserted in the same manner as that of Parent_Inst,
9059 -- before the next source body or at the end of the declarative
9060 -- list (body not available). If body P did not exist and
9061 -- Parent_Inst was frozen after Inst, either by a body
9062 -- following Inst or at the end of the declarative region,
9063 -- the freeze node for Inst must be inserted after that of
9064 -- Parent_Inst. This relation is established by comparing
9065 -- the Slocs of Parent_Inst freeze node and Inst.
9067 if List_Containing (Get_Package_Instantiation_Node (Par)) =
9069 and then Sloc (Freeze_Node (Par)) < Sloc (N)
9071 Insert_Freeze_Node_For_Instance (N, F_Node);
9073 Insert_After (Freeze_Node (Par), F_Node);
9076 -- Freeze package enclosing instance of inner generic after
9077 -- instance of enclosing generic.
9079 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body)
9080 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
9083 Enclosing : Entity_Id;
9086 Enclosing := Corresponding_Spec (Parent (N));
9088 if No (Enclosing) then
9089 Enclosing := Defining_Entity (Parent (N));
9092 Insert_Freeze_Node_For_Instance (N, F_Node);
9093 Ensure_Freeze_Node (Enclosing);
9095 if not Is_List_Member (Freeze_Node (Enclosing)) then
9097 -- The enclosing context is a subunit, insert the freeze
9098 -- node after the stub.
9100 if Nkind (Parent (Parent (N))) = N_Subunit then
9101 Insert_Freeze_Node_For_Instance
9102 (Corresponding_Stub (Parent (Parent (N))),
9103 Freeze_Node (Enclosing));
9105 -- The enclosing context is a package with a stub body
9106 -- which has already been replaced by the real body.
9107 -- Insert the freeze node after the actual body.
9109 elsif Ekind (Enclosing) = E_Package
9110 and then Present (Body_Entity (Enclosing))
9111 and then Was_Originally_Stub
9112 (Parent (Body_Entity (Enclosing)))
9114 Insert_Freeze_Node_For_Instance
9115 (Parent (Body_Entity (Enclosing)),
9116 Freeze_Node (Enclosing));
9118 -- The parent instance has been frozen before the body of
9119 -- the enclosing package, insert the freeze node after
9122 elsif List_Containing (Freeze_Node (Par)) =
9123 List_Containing (Parent (N))
9124 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N))
9126 Insert_Freeze_Node_For_Instance
9127 (Parent (N), Freeze_Node (Enclosing));
9131 (Freeze_Node (Par), Freeze_Node (Enclosing));
9137 Insert_Freeze_Node_For_Instance (N, F_Node);
9141 Insert_Freeze_Node_For_Instance (N, F_Node);
9145 Set_Is_Frozen (Act_Id);
9146 Insert_Before (N, Act_Body);
9147 Mark_Rewrite_Insertion (Act_Body);
9150 -----------------------------
9151 -- Install_Formal_Packages --
9152 -----------------------------
9154 procedure Install_Formal_Packages (Par : Entity_Id) is
9157 Gen_E : Entity_Id := Empty;
9160 E := First_Entity (Par);
9162 -- If we are installing an instance parent, locate the formal packages
9163 -- of its generic parent.
9165 if Is_Generic_Instance (Par) then
9166 Gen := Generic_Parent (Package_Specification (Par));
9167 Gen_E := First_Entity (Gen);
9170 while Present (E) loop
9171 if Ekind (E) = E_Package
9172 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
9174 -- If this is the renaming for the parent instance, done
9176 if Renamed_Object (E) = Par then
9179 -- The visibility of a formal of an enclosing generic is already
9182 elsif Denotes_Formal_Package (E) then
9185 elsif Present (Associated_Formal_Package (E)) then
9186 Check_Generic_Actuals (Renamed_Object (E), True);
9187 Set_Is_Hidden (E, False);
9189 -- Find formal package in generic unit that corresponds to
9190 -- (instance of) formal package in instance.
9192 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop
9193 Next_Entity (Gen_E);
9196 if Present (Gen_E) then
9197 Map_Formal_Package_Entities (Gen_E, E);
9204 if Present (Gen_E) then
9205 Next_Entity (Gen_E);
9208 end Install_Formal_Packages;
9210 --------------------
9211 -- Install_Parent --
9212 --------------------
9214 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
9215 Ancestors : constant Elist_Id := New_Elmt_List;
9216 S : constant Entity_Id := Current_Scope;
9217 Inst_Par : Entity_Id;
9218 First_Par : Entity_Id;
9219 Inst_Node : Node_Id;
9220 Gen_Par : Entity_Id;
9221 First_Gen : Entity_Id;
9224 procedure Install_Noninstance_Specs (Par : Entity_Id);
9225 -- Install the scopes of noninstance parent units ending with Par
9227 procedure Install_Spec (Par : Entity_Id);
9228 -- The child unit is within the declarative part of the parent, so the
9229 -- declarations within the parent are immediately visible.
9231 -------------------------------
9232 -- Install_Noninstance_Specs --
9233 -------------------------------
9235 procedure Install_Noninstance_Specs (Par : Entity_Id) is
9238 and then Par /= Standard_Standard
9239 and then not In_Open_Scopes (Par)
9241 Install_Noninstance_Specs (Scope (Par));
9244 end Install_Noninstance_Specs;
9250 procedure Install_Spec (Par : Entity_Id) is
9251 Spec : constant Node_Id := Package_Specification (Par);
9254 -- If this parent of the child instance is a top-level unit,
9255 -- then record the unit and its visibility for later resetting in
9256 -- Remove_Parent. We exclude units that are generic instances, as we
9257 -- only want to record this information for the ultimate top-level
9258 -- noninstance parent (is that always correct???).
9260 if Scope (Par) = Standard_Standard
9261 and then not Is_Generic_Instance (Par)
9263 Parent_Unit_Visible := Is_Immediately_Visible (Par);
9264 Instance_Parent_Unit := Par;
9267 -- Open the parent scope and make it and its declarations visible.
9268 -- If this point is not within a body, then only the visible
9269 -- declarations should be made visible, and installation of the
9270 -- private declarations is deferred until the appropriate point
9271 -- within analysis of the spec being instantiated (see the handling
9272 -- of parent visibility in Analyze_Package_Specification). This is
9273 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
9274 -- private view problems that occur when compiling instantiations of
9275 -- a generic child of that package (Generic_Dispatching_Constructor).
9276 -- If the instance freezes a tagged type, inlinings of operations
9277 -- from Ada.Tags may need the full view of type Tag. If inlining took
9278 -- proper account of establishing visibility of inlined subprograms'
9279 -- parents then it should be possible to remove this
9280 -- special check. ???
9283 Set_Is_Immediately_Visible (Par);
9284 Install_Visible_Declarations (Par);
9285 Set_Use (Visible_Declarations (Spec));
9287 if In_Body or else Is_RTU (Par, Ada_Tags) then
9288 Install_Private_Declarations (Par);
9289 Set_Use (Private_Declarations (Spec));
9293 -- Start of processing for Install_Parent
9296 -- We need to install the parent instance to compile the instantiation
9297 -- of the child, but the child instance must appear in the current
9298 -- scope. Given that we cannot place the parent above the current scope
9299 -- in the scope stack, we duplicate the current scope and unstack both
9300 -- after the instantiation is complete.
9302 -- If the parent is itself the instantiation of a child unit, we must
9303 -- also stack the instantiation of its parent, and so on. Each such
9304 -- ancestor is the prefix of the name in a prior instantiation.
9306 -- If this is a nested instance, the parent unit itself resolves to
9307 -- a renaming of the parent instance, whose declaration we need.
9309 -- Finally, the parent may be a generic (not an instance) when the
9310 -- child unit appears as a formal package.
9314 if Present (Renamed_Entity (Inst_Par)) then
9315 Inst_Par := Renamed_Entity (Inst_Par);
9318 First_Par := Inst_Par;
9320 Gen_Par := Generic_Parent (Package_Specification (Inst_Par));
9322 First_Gen := Gen_Par;
9324 while Present (Gen_Par) and then Is_Child_Unit (Gen_Par) loop
9326 -- Load grandparent instance as well
9328 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
9330 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
9331 Inst_Par := Entity (Prefix (Name (Inst_Node)));
9333 if Present (Renamed_Entity (Inst_Par)) then
9334 Inst_Par := Renamed_Entity (Inst_Par);
9337 Gen_Par := Generic_Parent (Package_Specification (Inst_Par));
9339 if Present (Gen_Par) then
9340 Prepend_Elmt (Inst_Par, Ancestors);
9343 -- Parent is not the name of an instantiation
9345 Install_Noninstance_Specs (Inst_Par);
9356 if Present (First_Gen) then
9357 Append_Elmt (First_Par, Ancestors);
9359 Install_Noninstance_Specs (First_Par);
9362 if not Is_Empty_Elmt_List (Ancestors) then
9363 Elmt := First_Elmt (Ancestors);
9364 while Present (Elmt) loop
9365 Install_Spec (Node (Elmt));
9366 Install_Formal_Packages (Node (Elmt));
9376 -------------------------------
9377 -- Install_Hidden_Primitives --
9378 -------------------------------
9380 procedure Install_Hidden_Primitives
9381 (Prims_List : in out Elist_Id;
9386 List : Elist_Id := No_Elist;
9387 Prim_G_Elmt : Elmt_Id;
9388 Prim_A_Elmt : Elmt_Id;
9393 -- No action needed in case of serious errors because we cannot trust
9394 -- in the order of primitives
9396 if Serious_Errors_Detected > 0 then
9399 -- No action possible if we don't have available the list of primitive
9403 or else not Is_Record_Type (Gen_T)
9404 or else not Is_Tagged_Type (Gen_T)
9405 or else not Is_Record_Type (Act_T)
9406 or else not Is_Tagged_Type (Act_T)
9410 -- There is no need to handle interface types since their primitives
9413 elsif Is_Interface (Gen_T) then
9417 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T));
9419 if not Is_Class_Wide_Type (Act_T) then
9420 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T));
9422 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T)));
9426 -- Skip predefined primitives in the generic formal
9428 while Present (Prim_G_Elmt)
9429 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt))
9431 Next_Elmt (Prim_G_Elmt);
9434 -- Skip predefined primitives in the generic actual
9436 while Present (Prim_A_Elmt)
9437 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt))
9439 Next_Elmt (Prim_A_Elmt);
9442 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt);
9444 Prim_G := Node (Prim_G_Elmt);
9445 Prim_A := Node (Prim_A_Elmt);
9447 -- There is no need to handle interface primitives because their
9448 -- primitives are not hidden
9450 exit when Present (Interface_Alias (Prim_G));
9452 -- Here we install one hidden primitive
9454 if Chars (Prim_G) /= Chars (Prim_A)
9455 and then Has_Suffix (Prim_A, 'P')
9456 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G)
9458 Set_Chars (Prim_A, Chars (Prim_G));
9459 Append_New_Elmt (Prim_A, To => List);
9462 Next_Elmt (Prim_A_Elmt);
9463 Next_Elmt (Prim_G_Elmt);
9466 -- Append the elements to the list of temporarily visible primitives
9467 -- avoiding duplicates.
9469 if Present (List) then
9470 if No (Prims_List) then
9471 Prims_List := New_Elmt_List;
9474 Elmt := First_Elmt (List);
9475 while Present (Elmt) loop
9476 Append_Unique_Elmt (Node (Elmt), Prims_List);
9480 end Install_Hidden_Primitives;
9482 -------------------------------
9483 -- Restore_Hidden_Primitives --
9484 -------------------------------
9486 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is
9487 Prim_Elmt : Elmt_Id;
9491 if Prims_List /= No_Elist then
9492 Prim_Elmt := First_Elmt (Prims_List);
9493 while Present (Prim_Elmt) loop
9494 Prim := Node (Prim_Elmt);
9495 Set_Chars (Prim, Add_Suffix (Prim, 'P'));
9496 Next_Elmt (Prim_Elmt);
9499 Prims_List := No_Elist;
9501 end Restore_Hidden_Primitives;
9503 --------------------------------
9504 -- Instantiate_Formal_Package --
9505 --------------------------------
9507 function Instantiate_Formal_Package
9510 Analyzed_Formal : Node_Id) return List_Id
9512 Loc : constant Source_Ptr := Sloc (Actual);
9513 Actual_Pack : Entity_Id;
9514 Formal_Pack : Entity_Id;
9515 Gen_Parent : Entity_Id;
9518 Parent_Spec : Node_Id;
9520 procedure Find_Matching_Actual
9522 Act : in out Entity_Id);
9523 -- We need to associate each formal entity in the formal package with
9524 -- the corresponding entity in the actual package. The actual package
9525 -- has been analyzed and possibly expanded, and as a result there is
9526 -- no one-to-one correspondence between the two lists (for example,
9527 -- the actual may include subtypes, itypes, and inherited primitive
9528 -- operations, interspersed among the renaming declarations for the
9529 -- actuals). We retrieve the corresponding actual by name because each
9530 -- actual has the same name as the formal, and they do appear in the
9533 function Get_Formal_Entity (N : Node_Id) return Entity_Id;
9534 -- Retrieve entity of defining entity of generic formal parameter.
9535 -- Only the declarations of formals need to be considered when
9536 -- linking them to actuals, but the declarative list may include
9537 -- internal entities generated during analysis, and those are ignored.
9539 procedure Match_Formal_Entity
9540 (Formal_Node : Node_Id;
9541 Formal_Ent : Entity_Id;
9542 Actual_Ent : Entity_Id);
9543 -- Associates the formal entity with the actual. In the case where
9544 -- Formal_Ent is a formal package, this procedure iterates through all
9545 -- of its formals and enters associations between the actuals occurring
9546 -- in the formal package's corresponding actual package (given by
9547 -- Actual_Ent) and the formal package's formal parameters. This
9548 -- procedure recurses if any of the parameters is itself a package.
9550 function Is_Instance_Of
9551 (Act_Spec : Entity_Id;
9552 Gen_Anc : Entity_Id) return Boolean;
9553 -- The actual can be an instantiation of a generic within another
9554 -- instance, in which case there is no direct link from it to the
9555 -- original generic ancestor. In that case, we recognize that the
9556 -- ultimate ancestor is the same by examining names and scopes.
9558 procedure Process_Nested_Formal (Formal : Entity_Id);
9559 -- If the current formal is declared with a box, its own formals are
9560 -- visible in the instance, as they were in the generic, and their
9561 -- Hidden flag must be reset. If some of these formals are themselves
9562 -- packages declared with a box, the processing must be recursive.
9564 --------------------------
9565 -- Find_Matching_Actual --
9566 --------------------------
9568 procedure Find_Matching_Actual
9570 Act : in out Entity_Id)
9572 Formal_Ent : Entity_Id;
9575 case Nkind (Original_Node (F)) is
9576 when N_Formal_Object_Declaration |
9577 N_Formal_Type_Declaration =>
9578 Formal_Ent := Defining_Identifier (F);
9580 while Chars (Act) /= Chars (Formal_Ent) loop
9584 when N_Formal_Subprogram_Declaration |
9585 N_Formal_Package_Declaration |
9586 N_Package_Declaration |
9587 N_Generic_Package_Declaration =>
9588 Formal_Ent := Defining_Entity (F);
9590 while Chars (Act) /= Chars (Formal_Ent) loop
9595 raise Program_Error;
9597 end Find_Matching_Actual;
9599 -------------------------
9600 -- Match_Formal_Entity --
9601 -------------------------
9603 procedure Match_Formal_Entity
9604 (Formal_Node : Node_Id;
9605 Formal_Ent : Entity_Id;
9606 Actual_Ent : Entity_Id)
9608 Act_Pkg : Entity_Id;
9611 Set_Instance_Of (Formal_Ent, Actual_Ent);
9613 if Ekind (Actual_Ent) = E_Package then
9615 -- Record associations for each parameter
9617 Act_Pkg := Actual_Ent;
9620 A_Ent : Entity_Id := First_Entity (Act_Pkg);
9629 -- Retrieve the actual given in the formal package declaration
9631 Actual := Entity (Name (Original_Node (Formal_Node)));
9633 -- The actual in the formal package declaration may be a
9634 -- renamed generic package, in which case we want to retrieve
9635 -- the original generic in order to traverse its formal part.
9637 if Present (Renamed_Entity (Actual)) then
9638 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual));
9640 Gen_Decl := Unit_Declaration_Node (Actual);
9643 Formals := Generic_Formal_Declarations (Gen_Decl);
9645 if Present (Formals) then
9646 F_Node := First_Non_Pragma (Formals);
9651 while Present (A_Ent)
9652 and then Present (F_Node)
9653 and then A_Ent /= First_Private_Entity (Act_Pkg)
9655 F_Ent := Get_Formal_Entity (F_Node);
9657 if Present (F_Ent) then
9659 -- This is a formal of the original package. Record
9660 -- association and recurse.
9662 Find_Matching_Actual (F_Node, A_Ent);
9663 Match_Formal_Entity (F_Node, F_Ent, A_Ent);
9664 Next_Entity (A_Ent);
9667 Next_Non_Pragma (F_Node);
9671 end Match_Formal_Entity;
9673 -----------------------
9674 -- Get_Formal_Entity --
9675 -----------------------
9677 function Get_Formal_Entity (N : Node_Id) return Entity_Id is
9678 Kind : constant Node_Kind := Nkind (Original_Node (N));
9681 when N_Formal_Object_Declaration =>
9682 return Defining_Identifier (N);
9684 when N_Formal_Type_Declaration =>
9685 return Defining_Identifier (N);
9687 when N_Formal_Subprogram_Declaration =>
9688 return Defining_Unit_Name (Specification (N));
9690 when N_Formal_Package_Declaration =>
9691 return Defining_Identifier (Original_Node (N));
9693 when N_Generic_Package_Declaration =>
9694 return Defining_Identifier (Original_Node (N));
9696 -- All other declarations are introduced by semantic analysis and
9697 -- have no match in the actual.
9702 end Get_Formal_Entity;
9704 --------------------
9705 -- Is_Instance_Of --
9706 --------------------
9708 function Is_Instance_Of
9709 (Act_Spec : Entity_Id;
9710 Gen_Anc : Entity_Id) return Boolean
9712 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
9715 if No (Gen_Par) then
9718 -- Simplest case: the generic parent of the actual is the formal
9720 elsif Gen_Par = Gen_Anc then
9723 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
9726 -- The actual may be obtained through several instantiations. Its
9727 -- scope must itself be an instance of a generic declared in the
9728 -- same scope as the formal. Any other case is detected above.
9730 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
9734 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
9738 ---------------------------
9739 -- Process_Nested_Formal --
9740 ---------------------------
9742 procedure Process_Nested_Formal (Formal : Entity_Id) is
9746 if Present (Associated_Formal_Package (Formal))
9747 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9749 Ent := First_Entity (Formal);
9750 while Present (Ent) loop
9751 Set_Is_Hidden (Ent, False);
9752 Set_Is_Visible_Formal (Ent);
9753 Set_Is_Potentially_Use_Visible
9754 (Ent, Is_Potentially_Use_Visible (Formal));
9756 if Ekind (Ent) = E_Package then
9757 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
9758 Process_Nested_Formal (Ent);
9764 end Process_Nested_Formal;
9766 -- Start of processing for Instantiate_Formal_Package
9771 if not Is_Entity_Name (Actual)
9772 or else Ekind (Entity (Actual)) /= E_Package
9775 ("expect package instance to instantiate formal", Actual);
9776 Abandon_Instantiation (Actual);
9777 raise Program_Error;
9780 Actual_Pack := Entity (Actual);
9781 Set_Is_Instantiated (Actual_Pack);
9783 -- The actual may be a renamed package, or an outer generic formal
9784 -- package whose instantiation is converted into a renaming.
9786 if Present (Renamed_Object (Actual_Pack)) then
9787 Actual_Pack := Renamed_Object (Actual_Pack);
9790 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
9791 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
9792 Formal_Pack := Defining_Identifier (Analyzed_Formal);
9795 Generic_Parent (Specification (Analyzed_Formal));
9797 Defining_Unit_Name (Specification (Analyzed_Formal));
9800 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
9801 Parent_Spec := Package_Specification (Actual_Pack);
9803 Parent_Spec := Parent (Actual_Pack);
9806 if Gen_Parent = Any_Id then
9808 ("previous error in declaration of formal package", Actual);
9809 Abandon_Instantiation (Actual);
9812 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
9818 ("actual parameter must be instance of&", Actual, Gen_Parent);
9819 Abandon_Instantiation (Actual);
9822 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
9823 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack);
9826 Make_Package_Renaming_Declaration (Loc,
9827 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
9828 Name => New_Occurrence_Of (Actual_Pack, Loc));
9830 Set_Associated_Formal_Package
9831 (Defining_Unit_Name (Nod), Defining_Identifier (Formal));
9832 Decls := New_List (Nod);
9834 -- If the formal F has a box, then the generic declarations are
9835 -- visible in the generic G. In an instance of G, the corresponding
9836 -- entities in the actual for F (which are the actuals for the
9837 -- instantiation of the generic that F denotes) must also be made
9838 -- visible for analysis of the current instance. On exit from the
9839 -- current instance, those entities are made private again. If the
9840 -- actual is currently in use, these entities are also use-visible.
9842 -- The loop through the actual entities also steps through the formal
9843 -- entities and enters associations from formals to actuals into the
9844 -- renaming map. This is necessary to properly handle checking of
9845 -- actual parameter associations for later formals that depend on
9846 -- actuals declared in the formal package.
9848 -- In Ada 2005, partial parameterization requires that we make
9849 -- visible the actuals corresponding to formals that were defaulted
9850 -- in the formal package. There formals are identified because they
9851 -- remain formal generics within the formal package, rather than
9852 -- being renamings of the actuals supplied.
9855 Gen_Decl : constant Node_Id :=
9856 Unit_Declaration_Node (Gen_Parent);
9857 Formals : constant List_Id :=
9858 Generic_Formal_Declarations (Gen_Decl);
9860 Actual_Ent : Entity_Id;
9861 Actual_Of_Formal : Node_Id;
9862 Formal_Node : Node_Id;
9863 Formal_Ent : Entity_Id;
9866 if Present (Formals) then
9867 Formal_Node := First_Non_Pragma (Formals);
9869 Formal_Node := Empty;
9872 Actual_Ent := First_Entity (Actual_Pack);
9874 First (Visible_Declarations (Specification (Analyzed_Formal)));
9875 while Present (Actual_Ent)
9876 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9878 if Present (Formal_Node) then
9879 Formal_Ent := Get_Formal_Entity (Formal_Node);
9881 if Present (Formal_Ent) then
9882 Find_Matching_Actual (Formal_Node, Actual_Ent);
9883 Match_Formal_Entity (Formal_Node, Formal_Ent, Actual_Ent);
9885 -- We iterate at the same time over the actuals of the
9886 -- local package created for the formal, to determine
9887 -- which one of the formals of the original generic were
9888 -- defaulted in the formal. The corresponding actual
9889 -- entities are visible in the enclosing instance.
9891 if Box_Present (Formal)
9893 (Present (Actual_Of_Formal)
9896 (Get_Formal_Entity (Actual_Of_Formal)))
9898 Set_Is_Hidden (Actual_Ent, False);
9899 Set_Is_Visible_Formal (Actual_Ent);
9900 Set_Is_Potentially_Use_Visible
9901 (Actual_Ent, In_Use (Actual_Pack));
9903 if Ekind (Actual_Ent) = E_Package then
9904 Process_Nested_Formal (Actual_Ent);
9908 Set_Is_Hidden (Actual_Ent);
9909 Set_Is_Potentially_Use_Visible (Actual_Ent, False);
9913 Next_Non_Pragma (Formal_Node);
9914 Next (Actual_Of_Formal);
9917 -- No further formals to match, but the generic part may
9918 -- contain inherited operation that are not hidden in the
9919 -- enclosing instance.
9921 Next_Entity (Actual_Ent);
9925 -- Inherited subprograms generated by formal derived types are
9926 -- also visible if the types are.
9928 Actual_Ent := First_Entity (Actual_Pack);
9929 while Present (Actual_Ent)
9930 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
9932 if Is_Overloadable (Actual_Ent)
9934 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration
9936 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent)))
9938 Set_Is_Hidden (Actual_Ent, False);
9939 Set_Is_Potentially_Use_Visible
9940 (Actual_Ent, In_Use (Actual_Pack));
9943 Next_Entity (Actual_Ent);
9947 -- If the formal is not declared with a box, reanalyze it as an
9948 -- abbreviated instantiation, to verify the matching rules of 12.7.
9949 -- The actual checks are performed after the generic associations
9950 -- have been analyzed, to guarantee the same visibility for this
9951 -- instantiation and for the actuals.
9953 -- In Ada 2005, the generic associations for the formal can include
9954 -- defaulted parameters. These are ignored during check. This
9955 -- internal instantiation is removed from the tree after conformance
9956 -- checking, because it contains formal declarations for those
9957 -- defaulted parameters, and those should not reach the back-end.
9959 if not Box_Present (Formal) then
9961 I_Pack : constant Entity_Id :=
9962 Make_Temporary (Sloc (Actual), 'P');
9965 Set_Is_Internal (I_Pack);
9968 Make_Package_Instantiation (Sloc (Actual),
9969 Defining_Unit_Name => I_Pack,
9972 (Get_Instance_Of (Gen_Parent), Sloc (Actual)),
9973 Generic_Associations => Generic_Associations (Formal)));
9979 end Instantiate_Formal_Package;
9981 -----------------------------------
9982 -- Instantiate_Formal_Subprogram --
9983 -----------------------------------
9985 function Instantiate_Formal_Subprogram
9988 Analyzed_Formal : Node_Id) return Node_Id
9990 Analyzed_S : constant Entity_Id :=
9991 Defining_Unit_Name (Specification (Analyzed_Formal));
9992 Formal_Sub : constant Entity_Id :=
9993 Defining_Unit_Name (Specification (Formal));
9995 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
9996 -- If the generic is a child unit, the parent has been installed on the
9997 -- scope stack, but a default subprogram cannot resolve to something
9998 -- on the parent because that parent is not really part of the visible
9999 -- context (it is there to resolve explicit local entities). If the
10000 -- default has resolved in this way, we remove the entity from immediate
10001 -- visibility and analyze the node again to emit an error message or
10002 -- find another visible candidate.
10004 procedure Valid_Actual_Subprogram (Act : Node_Id);
10005 -- Perform legality check and raise exception on failure
10007 -----------------------
10008 -- From_Parent_Scope --
10009 -----------------------
10011 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
10012 Gen_Scope : Node_Id;
10015 Gen_Scope := Scope (Analyzed_S);
10016 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop
10017 if Scope (Subp) = Scope (Gen_Scope) then
10021 Gen_Scope := Scope (Gen_Scope);
10025 end From_Parent_Scope;
10027 -----------------------------
10028 -- Valid_Actual_Subprogram --
10029 -----------------------------
10031 procedure Valid_Actual_Subprogram (Act : Node_Id) is
10035 if Is_Entity_Name (Act) then
10036 Act_E := Entity (Act);
10038 elsif Nkind (Act) = N_Selected_Component
10039 and then Is_Entity_Name (Selector_Name (Act))
10041 Act_E := Entity (Selector_Name (Act));
10047 if (Present (Act_E) and then Is_Overloadable (Act_E))
10048 or else Nkind_In (Act, N_Attribute_Reference,
10049 N_Indexed_Component,
10050 N_Character_Literal,
10051 N_Explicit_Dereference)
10057 ("expect subprogram or entry name in instantiation of &",
10058 Instantiation_Node, Formal_Sub);
10059 Abandon_Instantiation (Instantiation_Node);
10060 end Valid_Actual_Subprogram;
10064 Decl_Node : Node_Id;
10067 New_Spec : Node_Id;
10068 New_Subp : Entity_Id;
10070 -- Start of processing for Instantiate_Formal_Subprogram
10073 New_Spec := New_Copy_Tree (Specification (Formal));
10075 -- The tree copy has created the proper instantiation sloc for the
10076 -- new specification. Use this location for all other constructed
10079 Loc := Sloc (Defining_Unit_Name (New_Spec));
10081 -- Create new entity for the actual (New_Copy_Tree does not), and
10082 -- indicate that it is an actual.
10084 New_Subp := Make_Defining_Identifier (Loc, Chars (Formal_Sub));
10085 Set_Ekind (New_Subp, Ekind (Analyzed_S));
10086 Set_Is_Generic_Actual_Subprogram (New_Subp);
10087 Set_Defining_Unit_Name (New_Spec, New_Subp);
10089 -- Create new entities for the each of the formals in the specification
10090 -- of the renaming declaration built for the actual.
10092 if Present (Parameter_Specifications (New_Spec)) then
10098 F := First (Parameter_Specifications (New_Spec));
10099 while Present (F) loop
10100 F_Id := Defining_Identifier (F);
10102 Set_Defining_Identifier (F,
10103 Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id)));
10109 -- Find entity of actual. If the actual is an attribute reference, it
10110 -- cannot be resolved here (its formal is missing) but is handled
10111 -- instead in Attribute_Renaming. If the actual is overloaded, it is
10112 -- fully resolved subsequently, when the renaming declaration for the
10113 -- formal is analyzed. If it is an explicit dereference, resolve the
10114 -- prefix but not the actual itself, to prevent interpretation as call.
10116 if Present (Actual) then
10117 Loc := Sloc (Actual);
10118 Set_Sloc (New_Spec, Loc);
10120 if Nkind (Actual) = N_Operator_Symbol then
10121 Find_Direct_Name (Actual);
10123 elsif Nkind (Actual) = N_Explicit_Dereference then
10124 Analyze (Prefix (Actual));
10126 elsif Nkind (Actual) /= N_Attribute_Reference then
10130 Valid_Actual_Subprogram (Actual);
10133 elsif Present (Default_Name (Formal)) then
10134 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference,
10135 N_Selected_Component,
10136 N_Indexed_Component,
10137 N_Character_Literal)
10138 and then Present (Entity (Default_Name (Formal)))
10140 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
10142 Nam := New_Copy (Default_Name (Formal));
10143 Set_Sloc (Nam, Loc);
10146 elsif Box_Present (Formal) then
10148 -- Actual is resolved at the point of instantiation. Create an
10149 -- identifier or operator with the same name as the formal.
10151 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
10153 Make_Operator_Symbol (Loc,
10154 Chars => Chars (Formal_Sub),
10155 Strval => No_String);
10157 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
10160 elsif Nkind (Specification (Formal)) = N_Procedure_Specification
10161 and then Null_Present (Specification (Formal))
10163 -- Generate null body for procedure, for use in the instance
10166 Make_Subprogram_Body (Loc,
10167 Specification => New_Spec,
10168 Declarations => New_List,
10169 Handled_Statement_Sequence =>
10170 Make_Handled_Sequence_Of_Statements (Loc,
10171 Statements => New_List (Make_Null_Statement (Loc))));
10173 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec));
10177 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
10179 ("missing actual&", Instantiation_Node, Formal_Sub);
10181 ("\in instantiation of & declared#",
10182 Instantiation_Node, Scope (Analyzed_S));
10183 Abandon_Instantiation (Instantiation_Node);
10187 Make_Subprogram_Renaming_Declaration (Loc,
10188 Specification => New_Spec,
10191 -- If we do not have an actual and the formal specified <> then set to
10192 -- get proper default.
10194 if No (Actual) and then Box_Present (Formal) then
10195 Set_From_Default (Decl_Node);
10198 -- Gather possible interpretations for the actual before analyzing the
10199 -- instance. If overloaded, it will be resolved when analyzing the
10200 -- renaming declaration.
10202 if Box_Present (Formal) and then No (Actual) then
10205 if Is_Child_Unit (Scope (Analyzed_S))
10206 and then Present (Entity (Nam))
10208 if not Is_Overloaded (Nam) then
10209 if From_Parent_Scope (Entity (Nam)) then
10210 Set_Is_Immediately_Visible (Entity (Nam), False);
10211 Set_Entity (Nam, Empty);
10212 Set_Etype (Nam, Empty);
10215 Set_Is_Immediately_Visible (Entity (Nam));
10224 Get_First_Interp (Nam, I, It);
10225 while Present (It.Nam) loop
10226 if From_Parent_Scope (It.Nam) then
10230 Get_Next_Interp (I, It);
10237 -- The generic instantiation freezes the actual. This can only be done
10238 -- once the actual is resolved, in the analysis of the renaming
10239 -- declaration. To make the formal subprogram entity available, we set
10240 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
10241 -- This is also needed in Analyze_Subprogram_Renaming for the processing
10242 -- of formal abstract subprograms.
10244 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
10246 -- We cannot analyze the renaming declaration, and thus find the actual,
10247 -- until all the actuals are assembled in the instance. For subsequent
10248 -- checks of other actuals, indicate the node that will hold the
10249 -- instance of this formal.
10251 Set_Instance_Of (Analyzed_S, Nam);
10253 if Nkind (Actual) = N_Selected_Component
10254 and then Is_Task_Type (Etype (Prefix (Actual)))
10255 and then not Is_Frozen (Etype (Prefix (Actual)))
10257 -- The renaming declaration will create a body, which must appear
10258 -- outside of the instantiation, We move the renaming declaration
10259 -- out of the instance, and create an additional renaming inside,
10260 -- to prevent freezing anomalies.
10263 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E');
10266 Set_Defining_Unit_Name (New_Spec, Anon_Id);
10267 Insert_Before (Instantiation_Node, Decl_Node);
10268 Analyze (Decl_Node);
10270 -- Now create renaming within the instance
10273 Make_Subprogram_Renaming_Declaration (Loc,
10274 Specification => New_Copy_Tree (New_Spec),
10275 Name => New_Occurrence_Of (Anon_Id, Loc));
10277 Set_Defining_Unit_Name (Specification (Decl_Node),
10278 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
10283 end Instantiate_Formal_Subprogram;
10285 ------------------------
10286 -- Instantiate_Object --
10287 ------------------------
10289 function Instantiate_Object
10292 Analyzed_Formal : Node_Id) return List_Id
10294 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal);
10295 A_Gen_Obj : constant Entity_Id :=
10296 Defining_Identifier (Analyzed_Formal);
10297 Acc_Def : Node_Id := Empty;
10298 Act_Assoc : constant Node_Id := Parent (Actual);
10299 Actual_Decl : Node_Id := Empty;
10300 Decl_Node : Node_Id;
10303 List : constant List_Id := New_List;
10304 Loc : constant Source_Ptr := Sloc (Actual);
10305 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj);
10306 Subt_Decl : Node_Id := Empty;
10307 Subt_Mark : Node_Id := Empty;
10309 function Copy_Access_Def return Node_Id;
10310 -- If formal is an anonymous access, copy access definition of formal
10311 -- for generated object declaration.
10313 ---------------------
10314 -- Copy_Access_Def --
10315 ---------------------
10317 function Copy_Access_Def return Node_Id is
10319 Def := New_Copy_Tree (Acc_Def);
10321 -- In addition, if formal is an access to subprogram we need to
10322 -- generate new formals for the signature of the default, so that
10323 -- the tree is properly formatted for ASIS use.
10325 if Present (Access_To_Subprogram_Definition (Acc_Def)) then
10327 Par_Spec : Node_Id;
10330 First (Parameter_Specifications
10331 (Access_To_Subprogram_Definition (Def)));
10332 while Present (Par_Spec) loop
10333 Set_Defining_Identifier (Par_Spec,
10334 Make_Defining_Identifier (Sloc (Acc_Def),
10335 Chars => Chars (Defining_Identifier (Par_Spec))));
10342 end Copy_Access_Def;
10344 -- Start of processing for Instantiate_Object
10347 -- Formal may be an anonymous access
10349 if Present (Subtype_Mark (Formal)) then
10350 Subt_Mark := Subtype_Mark (Formal);
10352 Check_Access_Definition (Formal);
10353 Acc_Def := Access_Definition (Formal);
10356 -- Sloc for error message on missing actual
10358 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj));
10360 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then
10361 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
10364 Set_Parent (List, Parent (Actual));
10368 if Out_Present (Formal) then
10370 -- An IN OUT generic actual must be a name. The instantiation is a
10371 -- renaming declaration. The actual is the name being renamed. We
10372 -- use the actual directly, rather than a copy, because it is not
10373 -- used further in the list of actuals, and because a copy or a use
10374 -- of relocate_node is incorrect if the instance is nested within a
10375 -- generic. In order to simplify ASIS searches, the Generic_Parent
10376 -- field links the declaration to the generic association.
10378 if No (Actual) then
10380 ("missing actual &",
10381 Instantiation_Node, Gen_Obj);
10383 ("\in instantiation of & declared#",
10384 Instantiation_Node, Scope (A_Gen_Obj));
10385 Abandon_Instantiation (Instantiation_Node);
10388 if Present (Subt_Mark) then
10390 Make_Object_Renaming_Declaration (Loc,
10391 Defining_Identifier => New_Copy (Gen_Obj),
10392 Subtype_Mark => New_Copy_Tree (Subt_Mark),
10395 else pragma Assert (Present (Acc_Def));
10397 Make_Object_Renaming_Declaration (Loc,
10398 Defining_Identifier => New_Copy (Gen_Obj),
10399 Access_Definition => New_Copy_Tree (Acc_Def),
10403 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
10405 -- The analysis of the actual may produce Insert_Action nodes, so
10406 -- the declaration must have a context in which to attach them.
10408 Append (Decl_Node, List);
10411 -- Return if the analysis of the actual reported some error
10413 if Etype (Actual) = Any_Type then
10417 -- This check is performed here because Analyze_Object_Renaming will
10418 -- not check it when Comes_From_Source is False. Note though that the
10419 -- check for the actual being the name of an object will be performed
10420 -- in Analyze_Object_Renaming.
10422 if Is_Object_Reference (Actual)
10423 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
10426 ("illegal discriminant-dependent component for in out parameter",
10430 -- The actual has to be resolved in order to check that it is a
10431 -- variable (due to cases such as F (1), where F returns access to
10432 -- an array, and for overloaded prefixes).
10434 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj));
10436 -- If the type of the formal is not itself a formal, and the current
10437 -- unit is a child unit, the formal type must be declared in a
10438 -- parent, and must be retrieved by visibility.
10440 if Ftyp = Orig_Ftyp
10441 and then Is_Generic_Unit (Scope (Ftyp))
10442 and then Is_Child_Unit (Scope (A_Gen_Obj))
10445 Temp : constant Node_Id :=
10446 New_Copy_Tree (Subtype_Mark (Analyzed_Formal));
10448 Set_Entity (Temp, Empty);
10450 Ftyp := Entity (Temp);
10454 if Is_Private_Type (Ftyp)
10455 and then not Is_Private_Type (Etype (Actual))
10456 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
10457 or else Base_Type (Etype (Actual)) = Ftyp)
10459 -- If the actual has the type of the full view of the formal, or
10460 -- else a non-private subtype of the formal, then the visibility
10461 -- of the formal type has changed. Add to the actuals a subtype
10462 -- declaration that will force the exchange of views in the body
10463 -- of the instance as well.
10466 Make_Subtype_Declaration (Loc,
10467 Defining_Identifier => Make_Temporary (Loc, 'P'),
10468 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
10470 Prepend (Subt_Decl, List);
10472 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views);
10473 Exchange_Declarations (Ftyp);
10476 Resolve (Actual, Ftyp);
10478 if not Denotes_Variable (Actual) then
10479 Error_Msg_NE ("actual for& must be a variable", Actual, Gen_Obj);
10481 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
10483 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
10484 -- the type of the actual shall resolve to a specific anonymous
10487 if Ada_Version < Ada_2005
10488 or else Ekind (Base_Type (Ftyp)) /=
10489 E_Anonymous_Access_Type
10490 or else Ekind (Base_Type (Etype (Actual))) /=
10491 E_Anonymous_Access_Type
10494 ("type of actual does not match type of&", Actual, Gen_Obj);
10498 Note_Possible_Modification (Actual, Sure => True);
10500 -- Check for instantiation of atomic/volatile actual for
10501 -- non-atomic/volatile formal (RM C.6 (12)).
10503 if Is_Atomic_Object (Actual) and then not Is_Atomic (Orig_Ftyp) then
10505 ("cannot instantiate non-atomic formal object "
10506 & "with atomic actual", Actual);
10508 elsif Is_Volatile_Object (Actual) and then not Is_Volatile (Orig_Ftyp)
10511 ("cannot instantiate non-volatile formal object "
10512 & "with volatile actual", Actual);
10515 -- Formal in-parameter
10518 -- The instantiation of a generic formal in-parameter is constant
10519 -- declaration. The actual is the expression for that declaration.
10520 -- Its type is a full copy of the type of the formal. This may be
10521 -- an access to subprogram, for which we need to generate entities
10522 -- for the formals in the new signature.
10524 if Present (Actual) then
10525 if Present (Subt_Mark) then
10526 Def := New_Copy_Tree (Subt_Mark);
10527 else pragma Assert (Present (Acc_Def));
10528 Def := Copy_Access_Def;
10532 Make_Object_Declaration (Loc,
10533 Defining_Identifier => New_Copy (Gen_Obj),
10534 Constant_Present => True,
10535 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
10536 Object_Definition => Def,
10537 Expression => Actual);
10539 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
10541 -- A generic formal object of a tagged type is defined to be
10542 -- aliased so the new constant must also be treated as aliased.
10544 if Is_Tagged_Type (Etype (A_Gen_Obj)) then
10545 Set_Aliased_Present (Decl_Node);
10548 Append (Decl_Node, List);
10550 -- No need to repeat (pre-)analysis of some expression nodes
10551 -- already handled in Preanalyze_Actuals.
10553 if Nkind (Actual) /= N_Allocator then
10556 -- Return if the analysis of the actual reported some error
10558 if Etype (Actual) = Any_Type then
10564 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj);
10568 Typ := Get_Instance_Of (Formal_Type);
10570 -- If the actual appears in the current or an enclosing scope,
10571 -- use its type directly. This is relevant if it has an actual
10572 -- subtype that is distinct from its nominal one. This cannot
10573 -- be done in general because the type of the actual may
10574 -- depend on other actuals, and only be fully determined when
10575 -- the enclosing instance is analyzed.
10577 if Present (Etype (Actual))
10578 and then Is_Constr_Subt_For_U_Nominal (Etype (Actual))
10580 Freeze_Before (Instantiation_Node, Etype (Actual));
10582 Freeze_Before (Instantiation_Node, Typ);
10585 -- If the actual is an aggregate, perform name resolution on
10586 -- its components (the analysis of an aggregate does not do it)
10587 -- to capture local names that may be hidden if the generic is
10590 if Nkind (Actual) = N_Aggregate then
10591 Preanalyze_And_Resolve (Actual, Typ);
10594 if Is_Limited_Type (Typ)
10595 and then not OK_For_Limited_Init (Typ, Actual)
10598 ("initialization not allowed for limited types", Actual);
10599 Explain_Limited_Type (Typ, Actual);
10603 elsif Present (Default_Expression (Formal)) then
10605 -- Use default to construct declaration
10607 if Present (Subt_Mark) then
10608 Def := New_Copy (Subt_Mark);
10609 else pragma Assert (Present (Acc_Def));
10610 Def := Copy_Access_Def;
10614 Make_Object_Declaration (Sloc (Formal),
10615 Defining_Identifier => New_Copy (Gen_Obj),
10616 Constant_Present => True,
10617 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
10618 Object_Definition => Def,
10619 Expression => New_Copy_Tree
10620 (Default_Expression (Formal)));
10622 Append (Decl_Node, List);
10623 Set_Analyzed (Expression (Decl_Node), False);
10626 Error_Msg_NE ("missing actual&", Instantiation_Node, Gen_Obj);
10627 Error_Msg_NE ("\in instantiation of & declared#",
10628 Instantiation_Node, Scope (A_Gen_Obj));
10630 if Is_Scalar_Type (Etype (A_Gen_Obj)) then
10632 -- Create dummy constant declaration so that instance can be
10633 -- analyzed, to minimize cascaded visibility errors.
10635 if Present (Subt_Mark) then
10637 else pragma Assert (Present (Acc_Def));
10642 Make_Object_Declaration (Loc,
10643 Defining_Identifier => New_Copy (Gen_Obj),
10644 Constant_Present => True,
10645 Null_Exclusion_Present => Null_Exclusion_Present (Formal),
10646 Object_Definition => New_Copy (Def),
10648 Make_Attribute_Reference (Sloc (Gen_Obj),
10649 Attribute_Name => Name_First,
10650 Prefix => New_Copy (Def)));
10652 Append (Decl_Node, List);
10655 Abandon_Instantiation (Instantiation_Node);
10660 if Nkind (Actual) in N_Has_Entity then
10661 Actual_Decl := Parent (Entity (Actual));
10664 -- Ada 2005 (AI-423): For a formal object declaration with a null
10665 -- exclusion or an access definition that has a null exclusion: If the
10666 -- actual matching the formal object declaration denotes a generic
10667 -- formal object of another generic unit G, and the instantiation
10668 -- containing the actual occurs within the body of G or within the body
10669 -- of a generic unit declared within the declarative region of G, then
10670 -- the declaration of the formal object of G must have a null exclusion.
10671 -- Otherwise, the subtype of the actual matching the formal object
10672 -- declaration shall exclude null.
10674 if Ada_Version >= Ada_2005
10675 and then Present (Actual_Decl)
10676 and then Nkind_In (Actual_Decl, N_Formal_Object_Declaration,
10677 N_Object_Declaration)
10678 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration
10679 and then not Has_Null_Exclusion (Actual_Decl)
10680 and then Has_Null_Exclusion (Analyzed_Formal)
10682 Error_Msg_Sloc := Sloc (Analyzed_Formal);
10684 ("actual must exclude null to match generic formal#", Actual);
10687 -- An effectively volatile object cannot be used as an actual in a
10688 -- generic instantiation (SPARK RM 7.1.3(7)). The following check is
10689 -- relevant only when SPARK_Mode is on as it is not a standard Ada
10690 -- legality rule, and also verifies that the actual is an object.
10693 and then Present (Actual)
10694 and then Is_Object_Reference (Actual)
10695 and then Is_Effectively_Volatile_Object (Actual)
10698 ("volatile object cannot act as actual in generic instantiation",
10703 end Instantiate_Object;
10705 ------------------------------
10706 -- Instantiate_Package_Body --
10707 ------------------------------
10709 procedure Instantiate_Package_Body
10710 (Body_Info : Pending_Body_Info;
10711 Inlined_Body : Boolean := False;
10712 Body_Optional : Boolean := False)
10714 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
10715 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
10716 Loc : constant Source_Ptr := Sloc (Inst_Node);
10718 Gen_Id : constant Node_Id := Name (Inst_Node);
10719 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
10720 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
10721 Act_Spec : constant Node_Id := Specification (Act_Decl);
10722 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
10724 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode;
10725 Save_Style_Check : constant Boolean := Style_Check;
10727 Act_Body : Node_Id;
10728 Act_Body_Id : Entity_Id;
10729 Act_Body_Name : Node_Id;
10730 Gen_Body : Node_Id;
10731 Gen_Body_Id : Node_Id;
10732 Par_Ent : Entity_Id := Empty;
10733 Par_Vis : Boolean := False;
10735 Parent_Installed : Boolean := False;
10737 Vis_Prims_List : Elist_Id := No_Elist;
10738 -- List of primitives made temporarily visible in the instantiation
10739 -- to match the visibility of the formal type
10741 procedure Check_Initialized_Types;
10742 -- In a generic package body, an entity of a generic private type may
10743 -- appear uninitialized. This is suspicious, unless the actual is a
10744 -- fully initialized type.
10746 -----------------------------
10747 -- Check_Initialized_Types --
10748 -----------------------------
10750 procedure Check_Initialized_Types is
10752 Formal : Entity_Id;
10753 Actual : Entity_Id;
10754 Uninit_Var : Entity_Id;
10757 Decl := First (Generic_Formal_Declarations (Gen_Decl));
10758 while Present (Decl) loop
10759 Uninit_Var := Empty;
10761 if Nkind (Decl) = N_Private_Extension_Declaration then
10762 Uninit_Var := Uninitialized_Variable (Decl);
10764 elsif Nkind (Decl) = N_Formal_Type_Declaration
10765 and then Nkind (Formal_Type_Definition (Decl)) =
10766 N_Formal_Private_Type_Definition
10769 Uninitialized_Variable (Formal_Type_Definition (Decl));
10772 if Present (Uninit_Var) then
10773 Formal := Defining_Identifier (Decl);
10774 Actual := First_Entity (Act_Decl_Id);
10776 -- For each formal there is a subtype declaration that renames
10777 -- the actual and has the same name as the formal. Locate the
10778 -- formal for warning message about uninitialized variables
10779 -- in the generic, for which the actual type should be a fully
10780 -- initialized type.
10782 while Present (Actual) loop
10783 exit when Ekind (Actual) = E_Package
10784 and then Present (Renamed_Object (Actual));
10786 if Chars (Actual) = Chars (Formal)
10787 and then not Is_Scalar_Type (Actual)
10788 and then not Is_Fully_Initialized_Type (Actual)
10789 and then Warn_On_No_Value_Assigned
10791 Error_Msg_Node_2 := Formal;
10793 ("generic unit has uninitialized variable& of "
10794 & "formal private type &?v?", Actual, Uninit_Var);
10796 ("actual type for& should be fully initialized type?v?",
10801 Next_Entity (Actual);
10807 end Check_Initialized_Types;
10809 -- Start of processing for Instantiate_Package_Body
10812 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10814 -- The instance body may already have been processed, as the parent of
10815 -- another instance that is inlined (Load_Parent_Of_Generic).
10817 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
10821 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
10823 -- Re-establish the state of information on which checks are suppressed.
10824 -- This information was set in Body_Info at the point of instantiation,
10825 -- and now we restore it so that the instance is compiled using the
10826 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
10828 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
10829 Scope_Suppress := Body_Info.Scope_Suppress;
10830 Opt.Ada_Version := Body_Info.Version;
10831 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma;
10832 Restore_Warnings (Body_Info.Warnings);
10833 Opt.SPARK_Mode := Body_Info.SPARK_Mode;
10834 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma;
10836 if No (Gen_Body_Id) then
10838 -- Do not look for parent of generic body if none is required.
10839 -- This may happen when the routine is called as part of the
10840 -- Pending_Instantiations processing, when nested instances
10841 -- may precede the one generated from the main unit.
10843 if not Unit_Requires_Body (Defining_Entity (Gen_Decl))
10844 and then Body_Optional
10848 Load_Parent_Of_Generic
10849 (Inst_Node, Specification (Gen_Decl), Body_Optional);
10850 Gen_Body_Id := Corresponding_Body (Gen_Decl);
10854 -- Establish global variable for sloc adjustment and for error recovery
10855 -- In the case of an instance body for an instantiation with actuals
10856 -- from a limited view, the instance body is placed at the beginning
10857 -- of the enclosing package body: use the body entity as the source
10858 -- location for nodes of the instance body.
10860 if not Is_Empty_Elmt_List (Incomplete_Actuals (Act_Decl_Id)) then
10862 Scop : constant Entity_Id := Scope (Act_Decl_Id);
10863 Body_Id : constant Node_Id :=
10864 Corresponding_Body (Unit_Declaration_Node (Scop));
10867 Instantiation_Node := Body_Id;
10870 Instantiation_Node := Inst_Node;
10873 if Present (Gen_Body_Id) then
10874 Save_Env (Gen_Unit, Act_Decl_Id);
10875 Style_Check := False;
10877 -- If the context of the instance is subject to SPARK_Mode "off" or
10878 -- the annotation is altogether missing, set the global flag which
10879 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
10882 if SPARK_Mode /= On then
10883 Ignore_Pragma_SPARK_Mode := True;
10886 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
10887 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
10889 Create_Instantiation_Source
10890 (Inst_Node, Gen_Body_Id, S_Adjustment);
10894 (Original_Node (Gen_Body), Empty, Instantiating => True);
10896 -- Create proper (possibly qualified) defining name for the body, to
10897 -- correspond to the one in the spec.
10900 Make_Defining_Identifier (Sloc (Act_Decl_Id), Chars (Act_Decl_Id));
10901 Set_Comes_From_Source (Act_Body_Id, Comes_From_Source (Act_Decl_Id));
10903 -- Some attributes of spec entity are not inherited by body entity
10905 Set_Handler_Records (Act_Body_Id, No_List);
10907 if Nkind (Defining_Unit_Name (Act_Spec)) =
10908 N_Defining_Program_Unit_Name
10911 Make_Defining_Program_Unit_Name (Loc,
10913 New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
10914 Defining_Identifier => Act_Body_Id);
10916 Act_Body_Name := Act_Body_Id;
10919 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
10921 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
10922 Check_Generic_Actuals (Act_Decl_Id, False);
10923 Check_Initialized_Types;
10925 -- Install primitives hidden at the point of the instantiation but
10926 -- visible when processing the generic formals
10932 E := First_Entity (Act_Decl_Id);
10933 while Present (E) loop
10935 and then Is_Generic_Actual_Type (E)
10936 and then Is_Tagged_Type (E)
10938 Install_Hidden_Primitives
10939 (Prims_List => Vis_Prims_List,
10940 Gen_T => Generic_Parent_Type (Parent (E)),
10948 -- If it is a child unit, make the parent instance (which is an
10949 -- instance of the parent of the generic) visible. The parent
10950 -- instance is the prefix of the name of the generic unit.
10952 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
10953 and then Nkind (Gen_Id) = N_Expanded_Name
10955 Par_Ent := Entity (Prefix (Gen_Id));
10956 Par_Vis := Is_Immediately_Visible (Par_Ent);
10957 Install_Parent (Par_Ent, In_Body => True);
10958 Parent_Installed := True;
10960 elsif Is_Child_Unit (Gen_Unit) then
10961 Par_Ent := Scope (Gen_Unit);
10962 Par_Vis := Is_Immediately_Visible (Par_Ent);
10963 Install_Parent (Par_Ent, In_Body => True);
10964 Parent_Installed := True;
10967 -- If the instantiation is a library unit, and this is the main unit,
10968 -- then build the resulting compilation unit nodes for the instance.
10969 -- If this is a compilation unit but it is not the main unit, then it
10970 -- is the body of a unit in the context, that is being compiled
10971 -- because it is encloses some inlined unit or another generic unit
10972 -- being instantiated. In that case, this body is not part of the
10973 -- current compilation, and is not attached to the tree, but its
10974 -- parent must be set for analysis.
10976 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
10978 -- Replace instance node with body of instance, and create new
10979 -- node for corresponding instance declaration.
10981 Build_Instance_Compilation_Unit_Nodes
10982 (Inst_Node, Act_Body, Act_Decl);
10983 Analyze (Inst_Node);
10985 if Parent (Inst_Node) = Cunit (Main_Unit) then
10987 -- If the instance is a child unit itself, then set the scope
10988 -- of the expanded body to be the parent of the instantiation
10989 -- (ensuring that the fully qualified name will be generated
10990 -- for the elaboration subprogram).
10992 if Nkind (Defining_Unit_Name (Act_Spec)) =
10993 N_Defining_Program_Unit_Name
10995 Set_Scope (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
10999 -- Case where instantiation is not a library unit
11002 -- If this is an early instantiation, i.e. appears textually
11003 -- before the corresponding body and must be elaborated first,
11004 -- indicate that the body instance is to be delayed.
11006 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
11008 -- Now analyze the body. We turn off all checks if this is an
11009 -- internal unit, since there is no reason to have checks on for
11010 -- any predefined run-time library code. All such code is designed
11011 -- to be compiled with checks off.
11013 -- Note that we do NOT apply this criterion to children of GNAT
11014 -- The latter units must suppress checks explicitly if needed.
11016 -- We also do not suppress checks in CodePeer mode where we are
11017 -- interested in finding possible runtime errors.
11019 if not CodePeer_Mode
11020 and then Is_Predefined_File_Name
11021 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
11023 Analyze (Act_Body, Suppress => All_Checks);
11025 Analyze (Act_Body);
11029 Inherit_Context (Gen_Body, Inst_Node);
11031 -- Remove the parent instances if they have been placed on the scope
11032 -- stack to compile the body.
11034 if Parent_Installed then
11035 Remove_Parent (In_Body => True);
11037 -- Restore the previous visibility of the parent
11039 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
11042 Restore_Hidden_Primitives (Vis_Prims_List);
11043 Restore_Private_Views (Act_Decl_Id);
11045 -- Remove the current unit from visibility if this is an instance
11046 -- that is not elaborated on the fly for inlining purposes.
11048 if not Inlined_Body then
11049 Set_Is_Immediately_Visible (Act_Decl_Id, False);
11053 Ignore_Pragma_SPARK_Mode := Save_IPSM;
11054 Style_Check := Save_Style_Check;
11056 -- If we have no body, and the unit requires a body, then complain. This
11057 -- complaint is suppressed if we have detected other errors (since a
11058 -- common reason for missing the body is that it had errors).
11059 -- In CodePeer mode, a warning has been emitted already, no need for
11060 -- further messages.
11062 elsif Unit_Requires_Body (Gen_Unit)
11063 and then not Body_Optional
11065 if CodePeer_Mode then
11068 elsif Serious_Errors_Detected = 0 then
11070 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
11072 -- Don't attempt to perform any cleanup actions if some other error
11073 -- was already detected, since this can cause blowups.
11079 -- Case of package that does not need a body
11082 -- If the instantiation of the declaration is a library unit, rewrite
11083 -- the original package instantiation as a package declaration in the
11084 -- compilation unit node.
11086 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
11087 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
11088 Rewrite (Inst_Node, Act_Decl);
11090 -- Generate elaboration entity, in case spec has elaboration code.
11091 -- This cannot be done when the instance is analyzed, because it
11092 -- is not known yet whether the body exists.
11094 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
11095 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
11097 -- If the instantiation is not a library unit, then append the
11098 -- declaration to the list of implicitly generated entities, unless
11099 -- it is already a list member which means that it was already
11102 elsif not Is_List_Member (Act_Decl) then
11103 Mark_Rewrite_Insertion (Act_Decl);
11104 Insert_Before (Inst_Node, Act_Decl);
11108 Expander_Mode_Restore;
11109 end Instantiate_Package_Body;
11111 ---------------------------------
11112 -- Instantiate_Subprogram_Body --
11113 ---------------------------------
11115 procedure Instantiate_Subprogram_Body
11116 (Body_Info : Pending_Body_Info;
11117 Body_Optional : Boolean := False)
11119 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
11120 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
11121 Loc : constant Source_Ptr := Sloc (Inst_Node);
11122 Gen_Id : constant Node_Id := Name (Inst_Node);
11123 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
11124 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
11125 Act_Decl_Id : constant Entity_Id :=
11126 Defining_Unit_Name (Specification (Act_Decl));
11127 Pack_Id : constant Entity_Id :=
11128 Defining_Unit_Name (Parent (Act_Decl));
11130 Saved_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode;
11131 Saved_Style_Check : constant Boolean := Style_Check;
11132 Saved_Warnings : constant Warning_Record := Save_Warnings;
11134 Act_Body : Node_Id;
11135 Act_Body_Id : Entity_Id;
11136 Gen_Body : Node_Id;
11137 Gen_Body_Id : Node_Id;
11138 Pack_Body : Node_Id;
11139 Par_Ent : Entity_Id := Empty;
11140 Par_Vis : Boolean := False;
11141 Ret_Expr : Node_Id;
11143 Parent_Installed : Boolean := False;
11146 Gen_Body_Id := Corresponding_Body (Gen_Decl);
11148 -- Subprogram body may have been created already because of an inline
11149 -- pragma, or because of multiple elaborations of the enclosing package
11150 -- when several instances of the subprogram appear in the main unit.
11152 if Present (Corresponding_Body (Act_Decl)) then
11156 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
11158 -- Re-establish the state of information on which checks are suppressed.
11159 -- This information was set in Body_Info at the point of instantiation,
11160 -- and now we restore it so that the instance is compiled using the
11161 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11163 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top;
11164 Scope_Suppress := Body_Info.Scope_Suppress;
11165 Opt.Ada_Version := Body_Info.Version;
11166 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma;
11167 Restore_Warnings (Body_Info.Warnings);
11168 Opt.SPARK_Mode := Body_Info.SPARK_Mode;
11169 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma;
11171 if No (Gen_Body_Id) then
11173 -- For imported generic subprogram, no body to compile, complete
11174 -- the spec entity appropriately.
11176 if Is_Imported (Gen_Unit) then
11177 Set_Is_Imported (Act_Decl_Id);
11178 Set_First_Rep_Item (Act_Decl_Id, First_Rep_Item (Gen_Unit));
11179 Set_Interface_Name (Act_Decl_Id, Interface_Name (Gen_Unit));
11180 Set_Convention (Act_Decl_Id, Convention (Gen_Unit));
11181 Set_Has_Completion (Act_Decl_Id);
11184 -- For other cases, compile the body
11187 Load_Parent_Of_Generic
11188 (Inst_Node, Specification (Gen_Decl), Body_Optional);
11189 Gen_Body_Id := Corresponding_Body (Gen_Decl);
11193 Instantiation_Node := Inst_Node;
11195 if Present (Gen_Body_Id) then
11196 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
11198 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
11200 -- Either body is not present, or context is non-expanding, as
11201 -- when compiling a subunit. Mark the instance as completed, and
11202 -- diagnose a missing body when needed.
11205 and then Operating_Mode = Generate_Code
11208 ("missing proper body for instantiation", Gen_Body);
11211 Set_Has_Completion (Act_Decl_Id);
11215 Save_Env (Gen_Unit, Act_Decl_Id);
11216 Style_Check := False;
11218 -- If the context of the instance is subject to SPARK_Mode "off" or
11219 -- the annotation is altogether missing, set the global flag which
11220 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
11223 if SPARK_Mode /= On then
11224 Ignore_Pragma_SPARK_Mode := True;
11227 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
11228 Create_Instantiation_Source
11235 (Original_Node (Gen_Body), Empty, Instantiating => True);
11237 -- Create proper defining name for the body, to correspond to the one
11241 Make_Defining_Identifier (Sloc (Act_Decl_Id), Chars (Act_Decl_Id));
11243 Set_Comes_From_Source (Act_Body_Id, Comes_From_Source (Act_Decl_Id));
11244 Set_Defining_Unit_Name (Specification (Act_Body), Act_Body_Id);
11246 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
11247 Set_Has_Completion (Act_Decl_Id);
11248 Check_Generic_Actuals (Pack_Id, False);
11250 -- Generate a reference to link the visible subprogram instance to
11251 -- the generic body, which for navigation purposes is the only
11252 -- available source for the instance.
11255 (Related_Instance (Pack_Id),
11256 Gen_Body_Id, 'b', Set_Ref => False, Force => True);
11258 -- If it is a child unit, make the parent instance (which is an
11259 -- instance of the parent of the generic) visible. The parent
11260 -- instance is the prefix of the name of the generic unit.
11262 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
11263 and then Nkind (Gen_Id) = N_Expanded_Name
11265 Par_Ent := Entity (Prefix (Gen_Id));
11266 Par_Vis := Is_Immediately_Visible (Par_Ent);
11267 Install_Parent (Par_Ent, In_Body => True);
11268 Parent_Installed := True;
11270 elsif Is_Child_Unit (Gen_Unit) then
11271 Par_Ent := Scope (Gen_Unit);
11272 Par_Vis := Is_Immediately_Visible (Par_Ent);
11273 Install_Parent (Par_Ent, In_Body => True);
11274 Parent_Installed := True;
11277 -- Subprogram body is placed in the body of wrapper package,
11278 -- whose spec contains the subprogram declaration as well as
11279 -- the renaming declarations for the generic parameters.
11282 Make_Package_Body (Loc,
11283 Defining_Unit_Name => New_Copy (Pack_Id),
11284 Declarations => New_List (Act_Body));
11286 Set_Corresponding_Spec (Pack_Body, Pack_Id);
11288 -- If the instantiation is a library unit, then build resulting
11289 -- compilation unit nodes for the instance. The declaration of
11290 -- the enclosing package is the grandparent of the subprogram
11291 -- declaration. First replace the instantiation node as the unit
11292 -- of the corresponding compilation.
11294 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
11295 if Parent (Inst_Node) = Cunit (Main_Unit) then
11296 Set_Unit (Parent (Inst_Node), Inst_Node);
11297 Build_Instance_Compilation_Unit_Nodes
11298 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
11299 Analyze (Inst_Node);
11301 Set_Parent (Pack_Body, Parent (Inst_Node));
11302 Analyze (Pack_Body);
11306 Insert_Before (Inst_Node, Pack_Body);
11307 Mark_Rewrite_Insertion (Pack_Body);
11308 Analyze (Pack_Body);
11310 if Expander_Active then
11311 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
11315 Inherit_Context (Gen_Body, Inst_Node);
11317 Restore_Private_Views (Pack_Id, False);
11319 if Parent_Installed then
11320 Remove_Parent (In_Body => True);
11322 -- Restore the previous visibility of the parent
11324 Set_Is_Immediately_Visible (Par_Ent, Par_Vis);
11328 Ignore_Pragma_SPARK_Mode := Saved_IPSM;
11329 Style_Check := Saved_Style_Check;
11330 Restore_Warnings (Saved_Warnings);
11332 -- Body not found. Error was emitted already. If there were no previous
11333 -- errors, this may be an instance whose scope is a premature instance.
11334 -- In that case we must insure that the (legal) program does raise
11335 -- program error if executed. We generate a subprogram body for this
11336 -- purpose. See DEC ac30vso.
11338 -- Should not reference proprietary DEC tests in comments ???
11340 elsif Serious_Errors_Detected = 0
11341 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
11343 if Body_Optional then
11346 elsif Ekind (Act_Decl_Id) = E_Procedure then
11348 Make_Subprogram_Body (Loc,
11350 Make_Procedure_Specification (Loc,
11351 Defining_Unit_Name =>
11352 Make_Defining_Identifier (Loc, Chars (Act_Decl_Id)),
11353 Parameter_Specifications =>
11355 (Parameter_Specifications (Parent (Act_Decl_Id)))),
11357 Declarations => Empty_List,
11358 Handled_Statement_Sequence =>
11359 Make_Handled_Sequence_Of_Statements (Loc,
11362 Make_Raise_Program_Error (Loc,
11364 PE_Access_Before_Elaboration))));
11368 Make_Raise_Program_Error (Loc,
11369 Reason => PE_Access_Before_Elaboration);
11371 Set_Etype (Ret_Expr, (Etype (Act_Decl_Id)));
11372 Set_Analyzed (Ret_Expr);
11375 Make_Subprogram_Body (Loc,
11377 Make_Function_Specification (Loc,
11378 Defining_Unit_Name =>
11379 Make_Defining_Identifier (Loc, Chars (Act_Decl_Id)),
11380 Parameter_Specifications =>
11382 (Parameter_Specifications (Parent (Act_Decl_Id))),
11383 Result_Definition =>
11384 New_Occurrence_Of (Etype (Act_Decl_Id), Loc)),
11386 Declarations => Empty_List,
11387 Handled_Statement_Sequence =>
11388 Make_Handled_Sequence_Of_Statements (Loc,
11391 (Make_Simple_Return_Statement (Loc, Ret_Expr))));
11395 Make_Package_Body (Loc,
11396 Defining_Unit_Name => New_Copy (Pack_Id),
11397 Declarations => New_List (Act_Body));
11399 Insert_After (Inst_Node, Pack_Body);
11400 Set_Corresponding_Spec (Pack_Body, Pack_Id);
11401 Analyze (Pack_Body);
11404 Expander_Mode_Restore;
11405 end Instantiate_Subprogram_Body;
11407 ----------------------
11408 -- Instantiate_Type --
11409 ----------------------
11411 function Instantiate_Type
11414 Analyzed_Formal : Node_Id;
11415 Actual_Decls : List_Id) return List_Id
11417 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
11418 A_Gen_T : constant Entity_Id :=
11419 Defining_Identifier (Analyzed_Formal);
11420 Ancestor : Entity_Id := Empty;
11421 Def : constant Node_Id := Formal_Type_Definition (Formal);
11423 Decl_Node : Node_Id;
11424 Decl_Nodes : List_Id;
11428 procedure Diagnose_Predicated_Actual;
11429 -- There are a number of constructs in which a discrete type with
11430 -- predicates is illegal, e.g. as an index in an array type declaration.
11431 -- If a generic type is used is such a construct in a generic package
11432 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
11433 -- of the generic contract that the actual cannot have predicates.
11435 procedure Validate_Array_Type_Instance;
11436 procedure Validate_Access_Subprogram_Instance;
11437 procedure Validate_Access_Type_Instance;
11438 procedure Validate_Derived_Type_Instance;
11439 procedure Validate_Derived_Interface_Type_Instance;
11440 procedure Validate_Discriminated_Formal_Type;
11441 procedure Validate_Interface_Type_Instance;
11442 procedure Validate_Private_Type_Instance;
11443 procedure Validate_Incomplete_Type_Instance;
11444 -- These procedures perform validation tests for the named case.
11445 -- Validate_Discriminated_Formal_Type is shared by formal private
11446 -- types and Ada 2012 formal incomplete types.
11448 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
11449 -- Check that base types are the same and that the subtypes match
11450 -- statically. Used in several of the above.
11452 ---------------------------------
11453 -- Diagnose_Predicated_Actual --
11454 ---------------------------------
11456 procedure Diagnose_Predicated_Actual is
11458 if No_Predicate_On_Actual (A_Gen_T)
11459 and then Has_Predicates (Act_T)
11462 ("actual for& cannot be a type with predicate",
11463 Instantiation_Node, A_Gen_T);
11465 elsif No_Dynamic_Predicate_On_Actual (A_Gen_T)
11466 and then Has_Predicates (Act_T)
11467 and then not Has_Static_Predicate_Aspect (Act_T)
11470 ("actual for& cannot be a type with a dynamic predicate",
11471 Instantiation_Node, A_Gen_T);
11473 end Diagnose_Predicated_Actual;
11475 --------------------
11476 -- Subtypes_Match --
11477 --------------------
11479 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
11480 T : constant Entity_Id := Get_Instance_Of (Gen_T);
11483 -- Some detailed comments would be useful here ???
11485 return ((Base_Type (T) = Act_T
11486 or else Base_Type (T) = Base_Type (Act_T))
11487 and then Subtypes_Statically_Match (T, Act_T))
11489 or else (Is_Class_Wide_Type (Gen_T)
11490 and then Is_Class_Wide_Type (Act_T)
11491 and then Subtypes_Match
11492 (Get_Instance_Of (Root_Type (Gen_T)),
11493 Root_Type (Act_T)))
11496 (Ekind_In (Gen_T, E_Anonymous_Access_Subprogram_Type,
11497 E_Anonymous_Access_Type)
11498 and then Ekind (Act_T) = Ekind (Gen_T)
11499 and then Subtypes_Statically_Match
11500 (Designated_Type (Gen_T), Designated_Type (Act_T)));
11501 end Subtypes_Match;
11503 -----------------------------------------
11504 -- Validate_Access_Subprogram_Instance --
11505 -----------------------------------------
11507 procedure Validate_Access_Subprogram_Instance is
11509 if not Is_Access_Type (Act_T)
11510 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
11513 ("expect access type in instantiation of &", Actual, Gen_T);
11514 Abandon_Instantiation (Actual);
11517 -- According to AI05-288, actuals for access_to_subprograms must be
11518 -- subtype conformant with the generic formal. Previous to AI05-288
11519 -- only mode conformance was required.
11521 -- This is a binding interpretation that applies to previous versions
11522 -- of the language, no need to maintain previous weaker checks.
11524 Check_Subtype_Conformant
11525 (Designated_Type (Act_T),
11526 Designated_Type (A_Gen_T),
11530 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
11531 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
11533 ("protected access type not allowed for formal &",
11537 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
11539 ("expect protected access type for formal &",
11543 -- If the formal has a specified convention (which in most cases
11544 -- will be StdCall) verify that the actual has the same convention.
11546 if Has_Convention_Pragma (A_Gen_T)
11547 and then Convention (A_Gen_T) /= Convention (Act_T)
11549 Error_Msg_Name_1 := Get_Convention_Name (Convention (A_Gen_T));
11551 ("actual for formal & must have convention %", Actual, Gen_T);
11553 end Validate_Access_Subprogram_Instance;
11555 -----------------------------------
11556 -- Validate_Access_Type_Instance --
11557 -----------------------------------
11559 procedure Validate_Access_Type_Instance is
11560 Desig_Type : constant Entity_Id :=
11561 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T);
11562 Desig_Act : Entity_Id;
11565 if not Is_Access_Type (Act_T) then
11567 ("expect access type in instantiation of &", Actual, Gen_T);
11568 Abandon_Instantiation (Actual);
11571 if Is_Access_Constant (A_Gen_T) then
11572 if not Is_Access_Constant (Act_T) then
11574 ("actual type must be access-to-constant type", Actual);
11575 Abandon_Instantiation (Actual);
11578 if Is_Access_Constant (Act_T) then
11580 ("actual type must be access-to-variable type", Actual);
11581 Abandon_Instantiation (Actual);
11583 elsif Ekind (A_Gen_T) = E_General_Access_Type
11584 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
11586 Error_Msg_N -- CODEFIX
11587 ("actual must be general access type!", Actual);
11588 Error_Msg_NE -- CODEFIX
11589 ("add ALL to }!", Actual, Act_T);
11590 Abandon_Instantiation (Actual);
11594 -- The designated subtypes, that is to say the subtypes introduced
11595 -- by an access type declaration (and not by a subtype declaration)
11598 Desig_Act := Designated_Type (Base_Type (Act_T));
11600 -- The designated type may have been introduced through a limited_
11601 -- with clause, in which case retrieve the non-limited view. This
11602 -- applies to incomplete types as well as to class-wide types.
11604 if From_Limited_With (Desig_Act) then
11605 Desig_Act := Available_View (Desig_Act);
11608 if not Subtypes_Match (Desig_Type, Desig_Act) then
11610 ("designated type of actual does not match that of formal &",
11613 if not Predicates_Match (Desig_Type, Desig_Act) then
11614 Error_Msg_N ("\predicates do not match", Actual);
11617 Abandon_Instantiation (Actual);
11619 elsif Is_Access_Type (Designated_Type (Act_T))
11620 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
11622 Is_Constrained (Designated_Type (Desig_Type))
11625 ("designated type of actual does not match that of formal &",
11628 if not Predicates_Match (Desig_Type, Desig_Act) then
11629 Error_Msg_N ("\predicates do not match", Actual);
11632 Abandon_Instantiation (Actual);
11635 -- Ada 2005: null-exclusion indicators of the two types must agree
11637 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then
11639 ("non null exclusion of actual and formal & do not match",
11642 end Validate_Access_Type_Instance;
11644 ----------------------------------
11645 -- Validate_Array_Type_Instance --
11646 ----------------------------------
11648 procedure Validate_Array_Type_Instance is
11653 function Formal_Dimensions return Nat;
11654 -- Count number of dimensions in array type formal
11656 -----------------------
11657 -- Formal_Dimensions --
11658 -----------------------
11660 function Formal_Dimensions return Nat is
11665 if Nkind (Def) = N_Constrained_Array_Definition then
11666 Index := First (Discrete_Subtype_Definitions (Def));
11668 Index := First (Subtype_Marks (Def));
11671 while Present (Index) loop
11673 Next_Index (Index);
11677 end Formal_Dimensions;
11679 -- Start of processing for Validate_Array_Type_Instance
11682 if not Is_Array_Type (Act_T) then
11684 ("expect array type in instantiation of &", Actual, Gen_T);
11685 Abandon_Instantiation (Actual);
11687 elsif Nkind (Def) = N_Constrained_Array_Definition then
11688 if not (Is_Constrained (Act_T)) then
11690 ("expect constrained array in instantiation of &",
11692 Abandon_Instantiation (Actual);
11696 if Is_Constrained (Act_T) then
11698 ("expect unconstrained array in instantiation of &",
11700 Abandon_Instantiation (Actual);
11704 if Formal_Dimensions /= Number_Dimensions (Act_T) then
11706 ("dimensions of actual do not match formal &", Actual, Gen_T);
11707 Abandon_Instantiation (Actual);
11710 I1 := First_Index (A_Gen_T);
11711 I2 := First_Index (Act_T);
11712 for J in 1 .. Formal_Dimensions loop
11714 -- If the indexes of the actual were given by a subtype_mark,
11715 -- the index was transformed into a range attribute. Retrieve
11716 -- the original type mark for checking.
11718 if Is_Entity_Name (Original_Node (I2)) then
11719 T2 := Entity (Original_Node (I2));
11724 if not Subtypes_Match
11725 (Find_Actual_Type (Etype (I1), A_Gen_T), T2)
11728 ("index types of actual do not match those of formal &",
11730 Abandon_Instantiation (Actual);
11737 -- Check matching subtypes. Note that there are complex visibility
11738 -- issues when the generic is a child unit and some aspect of the
11739 -- generic type is declared in a parent unit of the generic. We do
11740 -- the test to handle this special case only after a direct check
11741 -- for static matching has failed. The case where both the component
11742 -- type and the array type are separate formals, and the component
11743 -- type is a private view may also require special checking in
11747 (Component_Type (A_Gen_T), Component_Type (Act_T))
11750 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T),
11751 Component_Type (Act_T))
11756 ("component subtype of actual does not match that of formal &",
11758 Abandon_Instantiation (Actual);
11761 if Has_Aliased_Components (A_Gen_T)
11762 and then not Has_Aliased_Components (Act_T)
11765 ("actual must have aliased components to match formal type &",
11768 end Validate_Array_Type_Instance;
11770 -----------------------------------------------
11771 -- Validate_Derived_Interface_Type_Instance --
11772 -----------------------------------------------
11774 procedure Validate_Derived_Interface_Type_Instance is
11775 Par : constant Entity_Id := Entity (Subtype_Indication (Def));
11779 -- First apply interface instance checks
11781 Validate_Interface_Type_Instance;
11783 -- Verify that immediate parent interface is an ancestor of
11787 and then not Interface_Present_In_Ancestor (Act_T, Par)
11790 ("interface actual must include progenitor&", Actual, Par);
11793 -- Now verify that the actual includes all other ancestors of
11796 Elmt := First_Elmt (Interfaces (A_Gen_T));
11797 while Present (Elmt) loop
11798 if not Interface_Present_In_Ancestor
11799 (Act_T, Get_Instance_Of (Node (Elmt)))
11802 ("interface actual must include progenitor&",
11803 Actual, Node (Elmt));
11808 end Validate_Derived_Interface_Type_Instance;
11810 ------------------------------------
11811 -- Validate_Derived_Type_Instance --
11812 ------------------------------------
11814 procedure Validate_Derived_Type_Instance is
11815 Actual_Discr : Entity_Id;
11816 Ancestor_Discr : Entity_Id;
11819 -- If the parent type in the generic declaration is itself a previous
11820 -- formal type, then it is local to the generic and absent from the
11821 -- analyzed generic definition. In that case the ancestor is the
11822 -- instance of the formal (which must have been instantiated
11823 -- previously), unless the ancestor is itself a formal derived type.
11824 -- In this latter case (which is the subject of Corrigendum 8652/0038
11825 -- (AI-202) the ancestor of the formals is the ancestor of its
11826 -- parent. Otherwise, the analyzed generic carries the parent type.
11827 -- If the parent type is defined in a previous formal package, then
11828 -- the scope of that formal package is that of the generic type
11829 -- itself, and it has already been mapped into the corresponding type
11830 -- in the actual package.
11832 -- Common case: parent type defined outside of the generic
11834 if Is_Entity_Name (Subtype_Mark (Def))
11835 and then Present (Entity (Subtype_Mark (Def)))
11837 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
11839 -- Check whether parent is defined in a previous formal package
11842 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
11845 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
11847 -- The type may be a local derivation, or a type extension of a
11848 -- previous formal, or of a formal of a parent package.
11850 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
11852 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
11854 -- Check whether the parent is another derived formal type in the
11855 -- same generic unit.
11857 if Etype (A_Gen_T) /= A_Gen_T
11858 and then Is_Generic_Type (Etype (A_Gen_T))
11859 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
11860 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
11862 -- Locate ancestor of parent from the subtype declaration
11863 -- created for the actual.
11869 Decl := First (Actual_Decls);
11870 while Present (Decl) loop
11871 if Nkind (Decl) = N_Subtype_Declaration
11872 and then Chars (Defining_Identifier (Decl)) =
11873 Chars (Etype (A_Gen_T))
11875 Ancestor := Generic_Parent_Type (Decl);
11883 pragma Assert (Present (Ancestor));
11885 -- The ancestor itself may be a previous formal that has been
11888 Ancestor := Get_Instance_Of (Ancestor);
11892 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
11895 -- Check whether parent is a previous formal of the current generic
11897 elsif Is_Derived_Type (A_Gen_T)
11898 and then Is_Generic_Type (Etype (A_Gen_T))
11899 and then Scope (A_Gen_T) = Scope (Etype (A_Gen_T))
11901 Ancestor := Get_Instance_Of (First_Subtype (Etype (A_Gen_T)));
11903 -- An unusual case: the actual is a type declared in a parent unit,
11904 -- but is not a formal type so there is no instance_of for it.
11905 -- Retrieve it by analyzing the record extension.
11907 elsif Is_Child_Unit (Scope (A_Gen_T))
11908 and then In_Open_Scopes (Scope (Act_T))
11909 and then Is_Generic_Instance (Scope (Act_T))
11911 Analyze (Subtype_Mark (Def));
11912 Ancestor := Entity (Subtype_Mark (Def));
11915 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
11918 -- If the formal derived type has pragma Preelaborable_Initialization
11919 -- then the actual type must have preelaborable initialization.
11921 if Known_To_Have_Preelab_Init (A_Gen_T)
11922 and then not Has_Preelaborable_Initialization (Act_T)
11925 ("actual for & must have preelaborable initialization",
11929 -- Ada 2005 (AI-251)
11931 if Ada_Version >= Ada_2005 and then Is_Interface (Ancestor) then
11932 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then
11934 ("(Ada 2005) expected type implementing & in instantiation",
11938 -- Finally verify that the (instance of) the ancestor is an ancestor
11941 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then
11943 ("expect type derived from & in instantiation",
11944 Actual, First_Subtype (Ancestor));
11945 Abandon_Instantiation (Actual);
11948 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
11949 -- that the formal type declaration has been rewritten as a private
11952 if Ada_Version >= Ada_2005
11953 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration
11954 and then Synchronized_Present (Parent (A_Gen_T))
11956 -- The actual must be a synchronized tagged type
11958 if not Is_Tagged_Type (Act_T) then
11960 ("actual of synchronized type must be tagged", Actual);
11961 Abandon_Instantiation (Actual);
11963 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration
11964 and then Nkind (Type_Definition (Parent (Act_T))) =
11965 N_Derived_Type_Definition
11966 and then not Synchronized_Present
11967 (Type_Definition (Parent (Act_T)))
11970 ("actual of synchronized type must be synchronized", Actual);
11971 Abandon_Instantiation (Actual);
11975 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
11976 -- removes the second instance of the phrase "or allow pass by copy".
11978 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
11980 ("cannot have atomic actual type for non-atomic formal type",
11983 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then
11985 ("cannot have volatile actual type for non-volatile formal type",
11989 -- It should not be necessary to check for unknown discriminants on
11990 -- Formal, but for some reason Has_Unknown_Discriminants is false for
11991 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
11992 -- needs fixing. ???
11994 if Is_Definite_Subtype (A_Gen_T)
11995 and then not Unknown_Discriminants_Present (Formal)
11996 and then not Is_Definite_Subtype (Act_T)
11998 Error_Msg_N ("actual subtype must be constrained", Actual);
11999 Abandon_Instantiation (Actual);
12002 if not Unknown_Discriminants_Present (Formal) then
12003 if Is_Constrained (Ancestor) then
12004 if not Is_Constrained (Act_T) then
12005 Error_Msg_N ("actual subtype must be constrained", Actual);
12006 Abandon_Instantiation (Actual);
12009 -- Ancestor is unconstrained, Check if generic formal and actual
12010 -- agree on constrainedness. The check only applies to array types
12011 -- and discriminated types.
12013 elsif Is_Constrained (Act_T) then
12014 if Ekind (Ancestor) = E_Access_Type
12015 or else (not Is_Constrained (A_Gen_T)
12016 and then Is_Composite_Type (A_Gen_T))
12018 Error_Msg_N ("actual subtype must be unconstrained", Actual);
12019 Abandon_Instantiation (Actual);
12022 -- A class-wide type is only allowed if the formal has unknown
12025 elsif Is_Class_Wide_Type (Act_T)
12026 and then not Has_Unknown_Discriminants (Ancestor)
12029 ("actual for & cannot be a class-wide type", Actual, Gen_T);
12030 Abandon_Instantiation (Actual);
12032 -- Otherwise, the formal and actual must have the same number
12033 -- of discriminants and each discriminant of the actual must
12034 -- correspond to a discriminant of the formal.
12036 elsif Has_Discriminants (Act_T)
12037 and then not Has_Unknown_Discriminants (Act_T)
12038 and then Has_Discriminants (Ancestor)
12040 Actual_Discr := First_Discriminant (Act_T);
12041 Ancestor_Discr := First_Discriminant (Ancestor);
12042 while Present (Actual_Discr)
12043 and then Present (Ancestor_Discr)
12045 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
12046 No (Corresponding_Discriminant (Actual_Discr))
12049 ("discriminant & does not correspond "
12050 & "to ancestor discriminant", Actual, Actual_Discr);
12051 Abandon_Instantiation (Actual);
12054 Next_Discriminant (Actual_Discr);
12055 Next_Discriminant (Ancestor_Discr);
12058 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
12060 ("actual for & must have same number of discriminants",
12062 Abandon_Instantiation (Actual);
12065 -- This case should be caught by the earlier check for
12066 -- constrainedness, but the check here is added for completeness.
12068 elsif Has_Discriminants (Act_T)
12069 and then not Has_Unknown_Discriminants (Act_T)
12072 ("actual for & must not have discriminants", Actual, Gen_T);
12073 Abandon_Instantiation (Actual);
12075 elsif Has_Discriminants (Ancestor) then
12077 ("actual for & must have known discriminants", Actual, Gen_T);
12078 Abandon_Instantiation (Actual);
12081 if not Subtypes_Statically_Compatible
12082 (Act_T, Ancestor, Formal_Derived_Matching => True)
12085 ("constraint on actual is incompatible with formal", Actual);
12086 Abandon_Instantiation (Actual);
12090 -- If the formal and actual types are abstract, check that there
12091 -- are no abstract primitives of the actual type that correspond to
12092 -- nonabstract primitives of the formal type (second sentence of
12095 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then
12096 Check_Abstract_Primitives : declare
12097 Gen_Prims : constant Elist_Id :=
12098 Primitive_Operations (A_Gen_T);
12099 Gen_Elmt : Elmt_Id;
12100 Gen_Subp : Entity_Id;
12101 Anc_Subp : Entity_Id;
12102 Anc_Formal : Entity_Id;
12103 Anc_F_Type : Entity_Id;
12105 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T);
12106 Act_Elmt : Elmt_Id;
12107 Act_Subp : Entity_Id;
12108 Act_Formal : Entity_Id;
12109 Act_F_Type : Entity_Id;
12111 Subprograms_Correspond : Boolean;
12113 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean;
12114 -- Returns true if T2 is derived directly or indirectly from
12115 -- T1, including derivations from interfaces. T1 and T2 are
12116 -- required to be specific tagged base types.
12118 ------------------------
12119 -- Is_Tagged_Ancestor --
12120 ------------------------
12122 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean
12124 Intfc_Elmt : Elmt_Id;
12127 -- The predicate is satisfied if the types are the same
12132 -- If we've reached the top of the derivation chain then
12133 -- we know that T1 is not an ancestor of T2.
12135 elsif Etype (T2) = T2 then
12138 -- Proceed to check T2's immediate parent
12140 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then
12143 -- Finally, check to see if T1 is an ancestor of any of T2's
12147 Intfc_Elmt := First_Elmt (Interfaces (T2));
12148 while Present (Intfc_Elmt) loop
12149 if Is_Ancestor (T1, Node (Intfc_Elmt)) then
12153 Next_Elmt (Intfc_Elmt);
12158 end Is_Tagged_Ancestor;
12160 -- Start of processing for Check_Abstract_Primitives
12163 -- Loop over all of the formal derived type's primitives
12165 Gen_Elmt := First_Elmt (Gen_Prims);
12166 while Present (Gen_Elmt) loop
12167 Gen_Subp := Node (Gen_Elmt);
12169 -- If the primitive of the formal is not abstract, then
12170 -- determine whether there is a corresponding primitive of
12171 -- the actual type that's abstract.
12173 if not Is_Abstract_Subprogram (Gen_Subp) then
12174 Act_Elmt := First_Elmt (Act_Prims);
12175 while Present (Act_Elmt) loop
12176 Act_Subp := Node (Act_Elmt);
12178 -- If we find an abstract primitive of the actual,
12179 -- then we need to test whether it corresponds to the
12180 -- subprogram from which the generic formal primitive
12183 if Is_Abstract_Subprogram (Act_Subp) then
12184 Anc_Subp := Alias (Gen_Subp);
12186 -- Test whether we have a corresponding primitive
12187 -- by comparing names, kinds, formal types, and
12190 if Chars (Anc_Subp) = Chars (Act_Subp)
12191 and then Ekind (Anc_Subp) = Ekind (Act_Subp)
12193 Anc_Formal := First_Formal (Anc_Subp);
12194 Act_Formal := First_Formal (Act_Subp);
12195 while Present (Anc_Formal)
12196 and then Present (Act_Formal)
12198 Anc_F_Type := Etype (Anc_Formal);
12199 Act_F_Type := Etype (Act_Formal);
12201 if Ekind (Anc_F_Type) =
12202 E_Anonymous_Access_Type
12204 Anc_F_Type := Designated_Type (Anc_F_Type);
12206 if Ekind (Act_F_Type) =
12207 E_Anonymous_Access_Type
12210 Designated_Type (Act_F_Type);
12216 Ekind (Act_F_Type) = E_Anonymous_Access_Type
12221 Anc_F_Type := Base_Type (Anc_F_Type);
12222 Act_F_Type := Base_Type (Act_F_Type);
12224 -- If the formal is controlling, then the
12225 -- the type of the actual primitive's formal
12226 -- must be derived directly or indirectly
12227 -- from the type of the ancestor primitive's
12230 if Is_Controlling_Formal (Anc_Formal) then
12231 if not Is_Tagged_Ancestor
12232 (Anc_F_Type, Act_F_Type)
12237 -- Otherwise the types of the formals must
12240 elsif Anc_F_Type /= Act_F_Type then
12244 Next_Entity (Anc_Formal);
12245 Next_Entity (Act_Formal);
12248 -- If we traversed through all of the formals
12249 -- then so far the subprograms correspond, so
12250 -- now check that any result types correspond.
12252 if No (Anc_Formal) and then No (Act_Formal) then
12253 Subprograms_Correspond := True;
12255 if Ekind (Act_Subp) = E_Function then
12256 Anc_F_Type := Etype (Anc_Subp);
12257 Act_F_Type := Etype (Act_Subp);
12259 if Ekind (Anc_F_Type) =
12260 E_Anonymous_Access_Type
12263 Designated_Type (Anc_F_Type);
12265 if Ekind (Act_F_Type) =
12266 E_Anonymous_Access_Type
12269 Designated_Type (Act_F_Type);
12271 Subprograms_Correspond := False;
12276 = E_Anonymous_Access_Type
12278 Subprograms_Correspond := False;
12281 Anc_F_Type := Base_Type (Anc_F_Type);
12282 Act_F_Type := Base_Type (Act_F_Type);
12284 -- Now either the result types must be
12285 -- the same or, if the result type is
12286 -- controlling, the result type of the
12287 -- actual primitive must descend from the
12288 -- result type of the ancestor primitive.
12290 if Subprograms_Correspond
12291 and then Anc_F_Type /= Act_F_Type
12293 Has_Controlling_Result (Anc_Subp)
12294 and then not Is_Tagged_Ancestor
12295 (Anc_F_Type, Act_F_Type)
12297 Subprograms_Correspond := False;
12301 -- Found a matching subprogram belonging to
12302 -- formal ancestor type, so actual subprogram
12303 -- corresponds and this violates 3.9.3(9).
12305 if Subprograms_Correspond then
12307 ("abstract subprogram & overrides "
12308 & "nonabstract subprogram of ancestor",
12315 Next_Elmt (Act_Elmt);
12319 Next_Elmt (Gen_Elmt);
12321 end Check_Abstract_Primitives;
12324 -- Verify that limitedness matches. If parent is a limited
12325 -- interface then the generic formal is not unless declared
12326 -- explicitly so. If not declared limited, the actual cannot be
12327 -- limited (see AI05-0087).
12329 -- Even though this AI is a binding interpretation, we enable the
12330 -- check only in Ada 2012 mode, because this improper construct
12331 -- shows up in user code and in existing B-tests.
12333 if Is_Limited_Type (Act_T)
12334 and then not Is_Limited_Type (A_Gen_T)
12335 and then Ada_Version >= Ada_2012
12337 if In_Instance then
12341 ("actual for non-limited & cannot be a limited type",
12343 Explain_Limited_Type (Act_T, Actual);
12344 Abandon_Instantiation (Actual);
12347 end Validate_Derived_Type_Instance;
12349 ----------------------------------------
12350 -- Validate_Discriminated_Formal_Type --
12351 ----------------------------------------
12353 procedure Validate_Discriminated_Formal_Type is
12354 Formal_Discr : Entity_Id;
12355 Actual_Discr : Entity_Id;
12356 Formal_Subt : Entity_Id;
12359 if Has_Discriminants (A_Gen_T) then
12360 if not Has_Discriminants (Act_T) then
12362 ("actual for & must have discriminants", Actual, Gen_T);
12363 Abandon_Instantiation (Actual);
12365 elsif Is_Constrained (Act_T) then
12367 ("actual for & must be unconstrained", Actual, Gen_T);
12368 Abandon_Instantiation (Actual);
12371 Formal_Discr := First_Discriminant (A_Gen_T);
12372 Actual_Discr := First_Discriminant (Act_T);
12373 while Formal_Discr /= Empty loop
12374 if Actual_Discr = Empty then
12376 ("discriminants on actual do not match formal",
12378 Abandon_Instantiation (Actual);
12381 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
12383 -- Access discriminants match if designated types do
12385 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
12386 and then (Ekind (Base_Type (Etype (Actual_Discr)))) =
12387 E_Anonymous_Access_Type
12390 (Designated_Type (Base_Type (Formal_Subt))) =
12391 Designated_Type (Base_Type (Etype (Actual_Discr)))
12395 elsif Base_Type (Formal_Subt) /=
12396 Base_Type (Etype (Actual_Discr))
12399 ("types of actual discriminants must match formal",
12401 Abandon_Instantiation (Actual);
12403 elsif not Subtypes_Statically_Match
12404 (Formal_Subt, Etype (Actual_Discr))
12405 and then Ada_Version >= Ada_95
12408 ("subtypes of actual discriminants must match formal",
12410 Abandon_Instantiation (Actual);
12413 Next_Discriminant (Formal_Discr);
12414 Next_Discriminant (Actual_Discr);
12417 if Actual_Discr /= Empty then
12419 ("discriminants on actual do not match formal",
12421 Abandon_Instantiation (Actual);
12425 end Validate_Discriminated_Formal_Type;
12427 ---------------------------------------
12428 -- Validate_Incomplete_Type_Instance --
12429 ---------------------------------------
12431 procedure Validate_Incomplete_Type_Instance is
12433 if not Is_Tagged_Type (Act_T)
12434 and then Is_Tagged_Type (A_Gen_T)
12437 ("actual for & must be a tagged type", Actual, Gen_T);
12440 Validate_Discriminated_Formal_Type;
12441 end Validate_Incomplete_Type_Instance;
12443 --------------------------------------
12444 -- Validate_Interface_Type_Instance --
12445 --------------------------------------
12447 procedure Validate_Interface_Type_Instance is
12449 if not Is_Interface (Act_T) then
12451 ("actual for formal interface type must be an interface",
12454 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T)
12455 or else Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T)
12456 or else Is_Protected_Interface (A_Gen_T) /=
12457 Is_Protected_Interface (Act_T)
12458 or else Is_Synchronized_Interface (A_Gen_T) /=
12459 Is_Synchronized_Interface (Act_T)
12462 ("actual for interface& does not match (RM 12.5.5(4))",
12465 end Validate_Interface_Type_Instance;
12467 ------------------------------------
12468 -- Validate_Private_Type_Instance --
12469 ------------------------------------
12471 procedure Validate_Private_Type_Instance is
12473 if Is_Limited_Type (Act_T)
12474 and then not Is_Limited_Type (A_Gen_T)
12476 if In_Instance then
12480 ("actual for non-limited & cannot be a limited type", Actual,
12482 Explain_Limited_Type (Act_T, Actual);
12483 Abandon_Instantiation (Actual);
12486 elsif Known_To_Have_Preelab_Init (A_Gen_T)
12487 and then not Has_Preelaborable_Initialization (Act_T)
12490 ("actual for & must have preelaborable initialization", Actual,
12493 elsif not Is_Definite_Subtype (Act_T)
12494 and then Is_Definite_Subtype (A_Gen_T)
12495 and then Ada_Version >= Ada_95
12498 ("actual for & must be a definite subtype", Actual, Gen_T);
12500 elsif not Is_Tagged_Type (Act_T)
12501 and then Is_Tagged_Type (A_Gen_T)
12504 ("actual for & must be a tagged type", Actual, Gen_T);
12507 Validate_Discriminated_Formal_Type;
12509 end Validate_Private_Type_Instance;
12511 -- Start of processing for Instantiate_Type
12514 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
12515 Error_Msg_N ("duplicate instantiation of generic type", Actual);
12516 return New_List (Error);
12518 elsif not Is_Entity_Name (Actual)
12519 or else not Is_Type (Entity (Actual))
12522 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
12523 Abandon_Instantiation (Actual);
12526 Act_T := Entity (Actual);
12528 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
12529 -- as a generic actual parameter if the corresponding formal type
12530 -- does not have a known_discriminant_part, or is a formal derived
12531 -- type that is an Unchecked_Union type.
12533 if Is_Unchecked_Union (Base_Type (Act_T)) then
12534 if not Has_Discriminants (A_Gen_T)
12535 or else (Is_Derived_Type (A_Gen_T)
12536 and then Is_Unchecked_Union (A_Gen_T))
12540 Error_Msg_N ("unchecked union cannot be the actual for a "
12541 & "discriminated formal type", Act_T);
12546 -- Deal with fixed/floating restrictions
12548 if Is_Floating_Point_Type (Act_T) then
12549 Check_Restriction (No_Floating_Point, Actual);
12550 elsif Is_Fixed_Point_Type (Act_T) then
12551 Check_Restriction (No_Fixed_Point, Actual);
12554 -- Deal with error of using incomplete type as generic actual.
12555 -- This includes limited views of a type, even if the non-limited
12556 -- view may be available.
12558 if Ekind (Act_T) = E_Incomplete_Type
12559 or else (Is_Class_Wide_Type (Act_T)
12560 and then Ekind (Root_Type (Act_T)) = E_Incomplete_Type)
12562 -- If the formal is an incomplete type, the actual can be
12563 -- incomplete as well.
12565 if Ekind (A_Gen_T) = E_Incomplete_Type then
12568 elsif Is_Class_Wide_Type (Act_T)
12569 or else No (Full_View (Act_T))
12571 Error_Msg_N ("premature use of incomplete type", Actual);
12572 Abandon_Instantiation (Actual);
12574 Act_T := Full_View (Act_T);
12575 Set_Entity (Actual, Act_T);
12577 if Has_Private_Component (Act_T) then
12579 ("premature use of type with private component", Actual);
12583 -- Deal with error of premature use of private type as generic actual
12585 elsif Is_Private_Type (Act_T)
12586 and then Is_Private_Type (Base_Type (Act_T))
12587 and then not Is_Generic_Type (Act_T)
12588 and then not Is_Derived_Type (Act_T)
12589 and then No (Full_View (Root_Type (Act_T)))
12591 -- If the formal is an incomplete type, the actual can be
12592 -- private or incomplete as well.
12594 if Ekind (A_Gen_T) = E_Incomplete_Type then
12597 Error_Msg_N ("premature use of private type", Actual);
12600 elsif Has_Private_Component (Act_T) then
12602 ("premature use of type with private component", Actual);
12605 Set_Instance_Of (A_Gen_T, Act_T);
12607 -- If the type is generic, the class-wide type may also be used
12609 if Is_Tagged_Type (A_Gen_T)
12610 and then Is_Tagged_Type (Act_T)
12611 and then not Is_Class_Wide_Type (A_Gen_T)
12613 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
12614 Class_Wide_Type (Act_T));
12617 if not Is_Abstract_Type (A_Gen_T)
12618 and then Is_Abstract_Type (Act_T)
12621 ("actual of non-abstract formal cannot be abstract", Actual);
12624 -- A generic scalar type is a first subtype for which we generate
12625 -- an anonymous base type. Indicate that the instance of this base
12626 -- is the base type of the actual.
12628 if Is_Scalar_Type (A_Gen_T) then
12629 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
12633 if Error_Posted (Act_T) then
12636 case Nkind (Def) is
12637 when N_Formal_Private_Type_Definition =>
12638 Validate_Private_Type_Instance;
12640 when N_Formal_Incomplete_Type_Definition =>
12641 Validate_Incomplete_Type_Instance;
12643 when N_Formal_Derived_Type_Definition =>
12644 Validate_Derived_Type_Instance;
12646 when N_Formal_Discrete_Type_Definition =>
12647 if not Is_Discrete_Type (Act_T) then
12649 ("expect discrete type in instantiation of&",
12651 Abandon_Instantiation (Actual);
12654 Diagnose_Predicated_Actual;
12656 when N_Formal_Signed_Integer_Type_Definition =>
12657 if not Is_Signed_Integer_Type (Act_T) then
12659 ("expect signed integer type in instantiation of&",
12661 Abandon_Instantiation (Actual);
12664 Diagnose_Predicated_Actual;
12666 when N_Formal_Modular_Type_Definition =>
12667 if not Is_Modular_Integer_Type (Act_T) then
12669 ("expect modular type in instantiation of &",
12671 Abandon_Instantiation (Actual);
12674 Diagnose_Predicated_Actual;
12676 when N_Formal_Floating_Point_Definition =>
12677 if not Is_Floating_Point_Type (Act_T) then
12679 ("expect float type in instantiation of &", Actual, Gen_T);
12680 Abandon_Instantiation (Actual);
12683 when N_Formal_Ordinary_Fixed_Point_Definition =>
12684 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
12686 ("expect ordinary fixed point type in instantiation of &",
12688 Abandon_Instantiation (Actual);
12691 when N_Formal_Decimal_Fixed_Point_Definition =>
12692 if not Is_Decimal_Fixed_Point_Type (Act_T) then
12694 ("expect decimal type in instantiation of &",
12696 Abandon_Instantiation (Actual);
12699 when N_Array_Type_Definition =>
12700 Validate_Array_Type_Instance;
12702 when N_Access_To_Object_Definition =>
12703 Validate_Access_Type_Instance;
12705 when N_Access_Function_Definition |
12706 N_Access_Procedure_Definition =>
12707 Validate_Access_Subprogram_Instance;
12709 when N_Record_Definition =>
12710 Validate_Interface_Type_Instance;
12712 when N_Derived_Type_Definition =>
12713 Validate_Derived_Interface_Type_Instance;
12716 raise Program_Error;
12721 Subt := New_Copy (Gen_T);
12723 -- Use adjusted sloc of subtype name as the location for other nodes in
12724 -- the subtype declaration.
12726 Loc := Sloc (Subt);
12729 Make_Subtype_Declaration (Loc,
12730 Defining_Identifier => Subt,
12731 Subtype_Indication => New_Occurrence_Of (Act_T, Loc));
12733 if Is_Private_Type (Act_T) then
12734 Set_Has_Private_View (Subtype_Indication (Decl_Node));
12736 elsif Is_Access_Type (Act_T)
12737 and then Is_Private_Type (Designated_Type (Act_T))
12739 Set_Has_Private_View (Subtype_Indication (Decl_Node));
12742 -- In Ada 2012 the actual may be a limited view. Indicate that
12743 -- the local subtype must be treated as such.
12745 if From_Limited_With (Act_T) then
12746 Set_Ekind (Subt, E_Incomplete_Subtype);
12747 Set_From_Limited_With (Subt);
12750 Decl_Nodes := New_List (Decl_Node);
12752 -- Flag actual derived types so their elaboration produces the
12753 -- appropriate renamings for the primitive operations of the ancestor.
12754 -- Flag actual for formal private types as well, to determine whether
12755 -- operations in the private part may override inherited operations.
12756 -- If the formal has an interface list, the ancestor is not the
12757 -- parent, but the analyzed formal that includes the interface
12758 -- operations of all its progenitors.
12760 -- Same treatment for formal private types, so we can check whether the
12761 -- type is tagged limited when validating derivations in the private
12762 -- part. (See AI05-096).
12764 if Nkind (Def) = N_Formal_Derived_Type_Definition then
12765 if Present (Interface_List (Def)) then
12766 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
12768 Set_Generic_Parent_Type (Decl_Node, Ancestor);
12771 elsif Nkind_In (Def, N_Formal_Private_Type_Definition,
12772 N_Formal_Incomplete_Type_Definition)
12774 Set_Generic_Parent_Type (Decl_Node, A_Gen_T);
12777 -- If the actual is a synchronized type that implements an interface,
12778 -- the primitive operations are attached to the corresponding record,
12779 -- and we have to treat it as an additional generic actual, so that its
12780 -- primitive operations become visible in the instance. The task or
12781 -- protected type itself does not carry primitive operations.
12783 if Is_Concurrent_Type (Act_T)
12784 and then Is_Tagged_Type (Act_T)
12785 and then Present (Corresponding_Record_Type (Act_T))
12786 and then Present (Ancestor)
12787 and then Is_Interface (Ancestor)
12790 Corr_Rec : constant Entity_Id :=
12791 Corresponding_Record_Type (Act_T);
12792 New_Corr : Entity_Id;
12793 Corr_Decl : Node_Id;
12796 New_Corr := Make_Temporary (Loc, 'S');
12798 Make_Subtype_Declaration (Loc,
12799 Defining_Identifier => New_Corr,
12800 Subtype_Indication =>
12801 New_Occurrence_Of (Corr_Rec, Loc));
12802 Append_To (Decl_Nodes, Corr_Decl);
12804 if Ekind (Act_T) = E_Task_Type then
12805 Set_Ekind (Subt, E_Task_Subtype);
12807 Set_Ekind (Subt, E_Protected_Subtype);
12810 Set_Corresponding_Record_Type (Subt, Corr_Rec);
12811 Set_Generic_Parent_Type (Corr_Decl, Ancestor);
12812 Set_Generic_Parent_Type (Decl_Node, Empty);
12816 -- For a floating-point type, capture dimension info if any, because
12817 -- the generated subtype declaration does not come from source and
12818 -- will not process dimensions.
12820 if Is_Floating_Point_Type (Act_T) then
12821 Copy_Dimensions (Act_T, Subt);
12825 end Instantiate_Type;
12827 ---------------------
12828 -- Is_In_Main_Unit --
12829 ---------------------
12831 function Is_In_Main_Unit (N : Node_Id) return Boolean is
12832 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
12833 Current_Unit : Node_Id;
12836 if Unum = Main_Unit then
12839 -- If the current unit is a subunit then it is either the main unit or
12840 -- is being compiled as part of the main unit.
12842 elsif Nkind (N) = N_Compilation_Unit then
12843 return Nkind (Unit (N)) = N_Subunit;
12846 Current_Unit := Parent (N);
12847 while Present (Current_Unit)
12848 and then Nkind (Current_Unit) /= N_Compilation_Unit
12850 Current_Unit := Parent (Current_Unit);
12853 -- The instantiation node is in the main unit, or else the current node
12854 -- (perhaps as the result of nested instantiations) is in the main unit,
12855 -- or in the declaration of the main unit, which in this last case must
12858 return Current_Unit = Cunit (Main_Unit)
12859 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
12860 or else (Present (Library_Unit (Current_Unit))
12861 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
12862 end Is_In_Main_Unit;
12864 ----------------------------
12865 -- Load_Parent_Of_Generic --
12866 ----------------------------
12868 procedure Load_Parent_Of_Generic
12871 Body_Optional : Boolean := False)
12873 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
12874 Saved_Style_Check : constant Boolean := Style_Check;
12875 Saved_Warnings : constant Warning_Record := Save_Warnings;
12876 True_Parent : Node_Id;
12877 Inst_Node : Node_Id;
12879 Previous_Instances : constant Elist_Id := New_Elmt_List;
12881 procedure Collect_Previous_Instances (Decls : List_Id);
12882 -- Collect all instantiations in the given list of declarations, that
12883 -- precede the generic that we need to load. If the bodies of these
12884 -- instantiations are available, we must analyze them, to ensure that
12885 -- the public symbols generated are the same when the unit is compiled
12886 -- to generate code, and when it is compiled in the context of a unit
12887 -- that needs a particular nested instance. This process is applied to
12888 -- both package and subprogram instances.
12890 --------------------------------
12891 -- Collect_Previous_Instances --
12892 --------------------------------
12894 procedure Collect_Previous_Instances (Decls : List_Id) is
12898 Decl := First (Decls);
12899 while Present (Decl) loop
12900 if Sloc (Decl) >= Sloc (Inst_Node) then
12903 -- If Decl is an instantiation, then record it as requiring
12904 -- instantiation of the corresponding body, except if it is an
12905 -- abbreviated instantiation generated internally for conformance
12906 -- checking purposes only for the case of a formal package
12907 -- declared without a box (see Instantiate_Formal_Package). Such
12908 -- an instantiation does not generate any code (the actual code
12909 -- comes from actual) and thus does not need to be analyzed here.
12910 -- If the instantiation appears with a generic package body it is
12911 -- not analyzed here either.
12913 elsif Nkind (Decl) = N_Package_Instantiation
12914 and then not Is_Internal (Defining_Entity (Decl))
12916 Append_Elmt (Decl, Previous_Instances);
12918 -- For a subprogram instantiation, omit instantiations intrinsic
12919 -- operations (Unchecked_Conversions, etc.) that have no bodies.
12921 elsif Nkind_In (Decl, N_Function_Instantiation,
12922 N_Procedure_Instantiation)
12923 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl)))
12925 Append_Elmt (Decl, Previous_Instances);
12927 elsif Nkind (Decl) = N_Package_Declaration then
12928 Collect_Previous_Instances
12929 (Visible_Declarations (Specification (Decl)));
12930 Collect_Previous_Instances
12931 (Private_Declarations (Specification (Decl)));
12933 -- Previous non-generic bodies may contain instances as well
12935 elsif Nkind (Decl) = N_Package_Body
12936 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package
12938 Collect_Previous_Instances (Declarations (Decl));
12940 elsif Nkind (Decl) = N_Subprogram_Body
12941 and then not Acts_As_Spec (Decl)
12942 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl))
12944 Collect_Previous_Instances (Declarations (Decl));
12949 end Collect_Previous_Instances;
12951 -- Start of processing for Load_Parent_Of_Generic
12954 if not In_Same_Source_Unit (N, Spec)
12955 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
12956 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
12957 and then not Is_In_Main_Unit (Spec))
12959 -- Find body of parent of spec, and analyze it. A special case arises
12960 -- when the parent is an instantiation, that is to say when we are
12961 -- currently instantiating a nested generic. In that case, there is
12962 -- no separate file for the body of the enclosing instance. Instead,
12963 -- the enclosing body must be instantiated as if it were a pending
12964 -- instantiation, in order to produce the body for the nested generic
12965 -- we require now. Note that in that case the generic may be defined
12966 -- in a package body, the instance defined in the same package body,
12967 -- and the original enclosing body may not be in the main unit.
12969 Inst_Node := Empty;
12971 True_Parent := Parent (Spec);
12972 while Present (True_Parent)
12973 and then Nkind (True_Parent) /= N_Compilation_Unit
12975 if Nkind (True_Parent) = N_Package_Declaration
12977 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
12979 -- Parent is a compilation unit that is an instantiation.
12980 -- Instantiation node has been replaced with package decl.
12982 Inst_Node := Original_Node (True_Parent);
12985 elsif Nkind (True_Parent) = N_Package_Declaration
12986 and then Present (Generic_Parent (Specification (True_Parent)))
12987 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
12989 -- Parent is an instantiation within another specification.
12990 -- Declaration for instance has been inserted before original
12991 -- instantiation node. A direct link would be preferable?
12993 Inst_Node := Next (True_Parent);
12994 while Present (Inst_Node)
12995 and then Nkind (Inst_Node) /= N_Package_Instantiation
13000 -- If the instance appears within a generic, and the generic
13001 -- unit is defined within a formal package of the enclosing
13002 -- generic, there is no generic body available, and none
13003 -- needed. A more precise test should be used ???
13005 if No (Inst_Node) then
13012 True_Parent := Parent (True_Parent);
13016 -- Case where we are currently instantiating a nested generic
13018 if Present (Inst_Node) then
13019 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
13021 -- Instantiation node and declaration of instantiated package
13022 -- were exchanged when only the declaration was needed.
13023 -- Restore instantiation node before proceeding with body.
13025 Set_Unit (Parent (True_Parent), Inst_Node);
13028 -- Now complete instantiation of enclosing body, if it appears in
13029 -- some other unit. If it appears in the current unit, the body
13030 -- will have been instantiated already.
13032 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
13034 -- We need to determine the expander mode to instantiate the
13035 -- enclosing body. Because the generic body we need may use
13036 -- global entities declared in the enclosing package (including
13037 -- aggregates) it is in general necessary to compile this body
13038 -- with expansion enabled, except if we are within a generic
13039 -- package, in which case the usual generic rule applies.
13042 Exp_Status : Boolean := True;
13046 -- Loop through scopes looking for generic package
13048 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
13049 while Present (Scop)
13050 and then Scop /= Standard_Standard
13052 if Ekind (Scop) = E_Generic_Package then
13053 Exp_Status := False;
13057 Scop := Scope (Scop);
13060 -- Collect previous instantiations in the unit that contains
13061 -- the desired generic.
13063 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit
13064 and then not Body_Optional
13068 Info : Pending_Body_Info;
13072 Par := Parent (Inst_Node);
13073 while Present (Par) loop
13074 exit when Nkind (Parent (Par)) = N_Compilation_Unit;
13075 Par := Parent (Par);
13078 pragma Assert (Present (Par));
13080 if Nkind (Par) = N_Package_Body then
13081 Collect_Previous_Instances (Declarations (Par));
13083 elsif Nkind (Par) = N_Package_Declaration then
13084 Collect_Previous_Instances
13085 (Visible_Declarations (Specification (Par)));
13086 Collect_Previous_Instances
13087 (Private_Declarations (Specification (Par)));
13090 -- Enclosing unit is a subprogram body. In this
13091 -- case all instance bodies are processed in order
13092 -- and there is no need to collect them separately.
13097 Decl := First_Elmt (Previous_Instances);
13098 while Present (Decl) loop
13100 (Inst_Node => Node (Decl),
13102 Instance_Spec (Node (Decl)),
13103 Expander_Status => Exp_Status,
13104 Current_Sem_Unit =>
13105 Get_Code_Unit (Sloc (Node (Decl))),
13106 Scope_Suppress => Scope_Suppress,
13107 Local_Suppress_Stack_Top =>
13108 Local_Suppress_Stack_Top,
13109 Version => Ada_Version,
13110 Version_Pragma => Ada_Version_Pragma,
13111 Warnings => Save_Warnings,
13112 SPARK_Mode => SPARK_Mode,
13113 SPARK_Mode_Pragma => SPARK_Mode_Pragma);
13115 -- Package instance
13118 Nkind (Node (Decl)) = N_Package_Instantiation
13120 Instantiate_Package_Body
13121 (Info, Body_Optional => True);
13123 -- Subprogram instance
13126 -- The instance_spec is in the wrapper package,
13127 -- usually followed by its local renaming
13128 -- declaration. See Build_Subprogram_Renaming
13129 -- for details. If the instance carries aspects,
13130 -- these result in the corresponding pragmas,
13131 -- inserted after the subprogram declaration.
13132 -- They must be skipped as well when retrieving
13133 -- the desired spec. A direct link would be
13138 (Last (Visible_Declarations
13139 (Specification (Info.Act_Decl))));
13141 while Nkind_In (Decl,
13142 N_Subprogram_Renaming_Declaration, N_Pragma)
13144 Decl := Prev (Decl);
13147 Info.Act_Decl := Decl;
13150 Instantiate_Subprogram_Body
13151 (Info, Body_Optional => True);
13159 Instantiate_Package_Body
13161 ((Inst_Node => Inst_Node,
13162 Act_Decl => True_Parent,
13163 Expander_Status => Exp_Status,
13164 Current_Sem_Unit => Get_Code_Unit
13165 (Sloc (Inst_Node)),
13166 Scope_Suppress => Scope_Suppress,
13167 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top,
13168 Version => Ada_Version,
13169 Version_Pragma => Ada_Version_Pragma,
13170 Warnings => Save_Warnings,
13171 SPARK_Mode => SPARK_Mode,
13172 SPARK_Mode_Pragma => SPARK_Mode_Pragma)),
13173 Body_Optional => Body_Optional);
13177 -- Case where we are not instantiating a nested generic
13180 Opt.Style_Check := False;
13181 Expander_Mode_Save_And_Set (True);
13182 Load_Needed_Body (Comp_Unit, OK);
13183 Opt.Style_Check := Saved_Style_Check;
13184 Restore_Warnings (Saved_Warnings);
13185 Expander_Mode_Restore;
13188 and then Unit_Requires_Body (Defining_Entity (Spec))
13189 and then not Body_Optional
13192 Bname : constant Unit_Name_Type :=
13193 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
13196 -- In CodePeer mode, the missing body may make the analysis
13197 -- incomplete, but we do not treat it as fatal.
13199 if CodePeer_Mode then
13203 Error_Msg_Unit_1 := Bname;
13204 Error_Msg_N ("this instantiation requires$!", N);
13205 Error_Msg_File_1 :=
13206 Get_File_Name (Bname, Subunit => False);
13207 Error_Msg_N ("\but file{ was not found!", N);
13208 raise Unrecoverable_Error;
13215 -- If loading parent of the generic caused an instantiation circularity,
13216 -- we abandon compilation at this point, because otherwise in some cases
13217 -- we get into trouble with infinite recursions after this point.
13219 if Circularity_Detected then
13220 raise Unrecoverable_Error;
13222 end Load_Parent_Of_Generic;
13224 ---------------------------------
13225 -- Map_Formal_Package_Entities --
13226 ---------------------------------
13228 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is
13233 Set_Instance_Of (Form, Act);
13235 -- Traverse formal and actual package to map the corresponding entities.
13236 -- We skip over internal entities that may be generated during semantic
13237 -- analysis, and find the matching entities by name, given that they
13238 -- must appear in the same order.
13240 E1 := First_Entity (Form);
13241 E2 := First_Entity (Act);
13242 while Present (E1) and then E1 /= First_Private_Entity (Form) loop
13243 -- Could this test be a single condition??? Seems like it could, and
13244 -- isn't FPE (Form) a constant anyway???
13246 if not Is_Internal (E1)
13247 and then Present (Parent (E1))
13248 and then not Is_Class_Wide_Type (E1)
13249 and then not Is_Internal_Name (Chars (E1))
13251 while Present (E2) and then Chars (E2) /= Chars (E1) loop
13258 Set_Instance_Of (E1, E2);
13260 if Is_Type (E1) and then Is_Tagged_Type (E2) then
13261 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2));
13264 if Is_Constrained (E1) then
13265 Set_Instance_Of (Base_Type (E1), Base_Type (E2));
13268 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then
13269 Map_Formal_Package_Entities (E1, E2);
13276 end Map_Formal_Package_Entities;
13278 -----------------------
13279 -- Move_Freeze_Nodes --
13280 -----------------------
13282 procedure Move_Freeze_Nodes
13283 (Out_Of : Entity_Id;
13288 Next_Decl : Node_Id;
13289 Next_Node : Node_Id := After;
13292 function Is_Outer_Type (T : Entity_Id) return Boolean;
13293 -- Check whether entity is declared in a scope external to that of the
13296 -------------------
13297 -- Is_Outer_Type --
13298 -------------------
13300 function Is_Outer_Type (T : Entity_Id) return Boolean is
13301 Scop : Entity_Id := Scope (T);
13304 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
13308 while Scop /= Standard_Standard loop
13309 if Scop = Out_Of then
13312 Scop := Scope (Scop);
13320 -- Start of processing for Move_Freeze_Nodes
13327 -- First remove the freeze nodes that may appear before all other
13331 while Present (Decl)
13332 and then Nkind (Decl) = N_Freeze_Entity
13333 and then Is_Outer_Type (Entity (Decl))
13335 Decl := Remove_Head (L);
13336 Insert_After (Next_Node, Decl);
13337 Set_Analyzed (Decl, False);
13342 -- Next scan the list of declarations and remove each freeze node that
13343 -- appears ahead of the current node.
13345 while Present (Decl) loop
13346 while Present (Next (Decl))
13347 and then Nkind (Next (Decl)) = N_Freeze_Entity
13348 and then Is_Outer_Type (Entity (Next (Decl)))
13350 Next_Decl := Remove_Next (Decl);
13351 Insert_After (Next_Node, Next_Decl);
13352 Set_Analyzed (Next_Decl, False);
13353 Next_Node := Next_Decl;
13356 -- If the declaration is a nested package or concurrent type, then
13357 -- recurse. Nested generic packages will have been processed from the
13360 case Nkind (Decl) is
13361 when N_Package_Declaration =>
13362 Spec := Specification (Decl);
13364 when N_Task_Type_Declaration =>
13365 Spec := Task_Definition (Decl);
13367 when N_Protected_Type_Declaration =>
13368 Spec := Protected_Definition (Decl);
13374 if Present (Spec) then
13375 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec));
13376 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec));
13381 end Move_Freeze_Nodes;
13387 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
13389 return Generic_Renamings.Table (E).Next_In_HTable;
13392 ------------------------
13393 -- Preanalyze_Actuals --
13394 ------------------------
13396 procedure Preanalyze_Actuals (N : Node_Id; Inst : Entity_Id := Empty) is
13399 Errs : constant Nat := Serious_Errors_Detected;
13401 Cur : Entity_Id := Empty;
13402 -- Current homograph of the instance name
13405 -- Saved visibility status of the current homograph
13408 Assoc := First (Generic_Associations (N));
13410 -- If the instance is a child unit, its name may hide an outer homonym,
13411 -- so make it invisible to perform name resolution on the actuals.
13413 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name
13415 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N))))
13417 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N)));
13419 if Is_Compilation_Unit (Cur) then
13420 Vis := Is_Immediately_Visible (Cur);
13421 Set_Is_Immediately_Visible (Cur, False);
13427 while Present (Assoc) loop
13428 if Nkind (Assoc) /= N_Others_Choice then
13429 Act := Explicit_Generic_Actual_Parameter (Assoc);
13431 -- Within a nested instantiation, a defaulted actual is an empty
13432 -- association, so nothing to analyze. If the subprogram actual
13433 -- is an attribute, analyze prefix only, because actual is not a
13434 -- complete attribute reference.
13436 -- If actual is an allocator, analyze expression only. The full
13437 -- analysis can generate code, and if instance is a compilation
13438 -- unit we have to wait until the package instance is installed
13439 -- to have a proper place to insert this code.
13441 -- String literals may be operators, but at this point we do not
13442 -- know whether the actual is a formal subprogram or a string.
13447 elsif Nkind (Act) = N_Attribute_Reference then
13448 Analyze (Prefix (Act));
13450 elsif Nkind (Act) = N_Explicit_Dereference then
13451 Analyze (Prefix (Act));
13453 elsif Nkind (Act) = N_Allocator then
13455 Expr : constant Node_Id := Expression (Act);
13458 if Nkind (Expr) = N_Subtype_Indication then
13459 Analyze (Subtype_Mark (Expr));
13461 -- Analyze separately each discriminant constraint, when
13462 -- given with a named association.
13468 Constr := First (Constraints (Constraint (Expr)));
13469 while Present (Constr) loop
13470 if Nkind (Constr) = N_Discriminant_Association then
13471 Analyze (Expression (Constr));
13485 elsif Nkind (Act) /= N_Operator_Symbol then
13488 -- Within a package instance, mark actuals that are limited
13489 -- views, so their use can be moved to the body of the
13492 if Is_Entity_Name (Act)
13493 and then Is_Type (Entity (Act))
13494 and then From_Limited_With (Entity (Act))
13495 and then Present (Inst)
13497 Append_Elmt (Entity (Act), Incomplete_Actuals (Inst));
13501 if Errs /= Serious_Errors_Detected then
13503 -- Do a minimal analysis of the generic, to prevent spurious
13504 -- warnings complaining about the generic being unreferenced,
13505 -- before abandoning the instantiation.
13507 Analyze (Name (N));
13509 if Is_Entity_Name (Name (N))
13510 and then Etype (Name (N)) /= Any_Type
13512 Generate_Reference (Entity (Name (N)), Name (N));
13513 Set_Is_Instantiated (Entity (Name (N)));
13516 if Present (Cur) then
13518 -- For the case of a child instance hiding an outer homonym,
13519 -- provide additional warning which might explain the error.
13521 Set_Is_Immediately_Visible (Cur, Vis);
13523 ("& hides outer unit with the same name??",
13524 N, Defining_Unit_Name (N));
13527 Abandon_Instantiation (Act);
13534 if Present (Cur) then
13535 Set_Is_Immediately_Visible (Cur, Vis);
13537 end Preanalyze_Actuals;
13539 -------------------
13540 -- Remove_Parent --
13541 -------------------
13543 procedure Remove_Parent (In_Body : Boolean := False) is
13544 S : Entity_Id := Current_Scope;
13545 -- S is the scope containing the instantiation just completed. The scope
13546 -- stack contains the parent instances of the instantiation, followed by
13555 -- After child instantiation is complete, remove from scope stack the
13556 -- extra copy of the current scope, and then remove parent instances.
13558 if not In_Body then
13561 while Current_Scope /= S loop
13562 P := Current_Scope;
13563 End_Package_Scope (Current_Scope);
13565 if In_Open_Scopes (P) then
13566 E := First_Entity (P);
13567 while Present (E) loop
13568 Set_Is_Immediately_Visible (E, True);
13572 -- If instantiation is declared in a block, it is the enclosing
13573 -- scope that might be a parent instance. Note that only one
13574 -- block can be involved, because the parent instances have
13575 -- been installed within it.
13577 if Ekind (P) = E_Block then
13578 Cur_P := Scope (P);
13583 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then
13584 -- We are within an instance of some sibling. Retain
13585 -- visibility of parent, for proper subsequent cleanup, and
13586 -- reinstall private declarations as well.
13588 Set_In_Private_Part (P);
13589 Install_Private_Declarations (P);
13592 -- If the ultimate parent is a top-level unit recorded in
13593 -- Instance_Parent_Unit, then reset its visibility to what it was
13594 -- before instantiation. (It's not clear what the purpose is of
13595 -- testing whether Scope (P) is In_Open_Scopes, but that test was
13596 -- present before the ultimate parent test was added.???)
13598 elsif not In_Open_Scopes (Scope (P))
13599 or else (P = Instance_Parent_Unit
13600 and then not Parent_Unit_Visible)
13602 Set_Is_Immediately_Visible (P, False);
13604 -- If the current scope is itself an instantiation of a generic
13605 -- nested within P, and we are in the private part of body of this
13606 -- instantiation, restore the full views of P, that were removed
13607 -- in End_Package_Scope above. This obscure case can occur when a
13608 -- subunit of a generic contains an instance of a child unit of
13609 -- its generic parent unit.
13611 elsif S = Current_Scope and then Is_Generic_Instance (S) then
13613 Par : constant Entity_Id :=
13614 Generic_Parent (Package_Specification (S));
13617 and then P = Scope (Par)
13618 and then (In_Package_Body (S) or else In_Private_Part (S))
13620 Set_In_Private_Part (P);
13621 Install_Private_Declarations (P);
13627 -- Reset visibility of entities in the enclosing scope
13629 Set_Is_Hidden_Open_Scope (Current_Scope, False);
13631 Hidden := First_Elmt (Hidden_Entities);
13632 while Present (Hidden) loop
13633 Set_Is_Immediately_Visible (Node (Hidden), True);
13634 Next_Elmt (Hidden);
13638 -- Each body is analyzed separately, and there is no context that
13639 -- needs preserving from one body instance to the next, so remove all
13640 -- parent scopes that have been installed.
13642 while Present (S) loop
13643 End_Package_Scope (S);
13644 Set_Is_Immediately_Visible (S, False);
13645 S := Current_Scope;
13646 exit when S = Standard_Standard;
13655 procedure Restore_Env is
13656 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
13659 if No (Current_Instantiated_Parent.Act_Id) then
13660 -- Restore environment after subprogram inlining
13662 Restore_Private_Views (Empty);
13665 Current_Instantiated_Parent := Saved.Instantiated_Parent;
13666 Exchanged_Views := Saved.Exchanged_Views;
13667 Hidden_Entities := Saved.Hidden_Entities;
13668 Current_Sem_Unit := Saved.Current_Sem_Unit;
13669 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
13670 Instance_Parent_Unit := Saved.Instance_Parent_Unit;
13672 Restore_Opt_Config_Switches (Saved.Switches);
13674 Instance_Envs.Decrement_Last;
13677 ---------------------------
13678 -- Restore_Private_Views --
13679 ---------------------------
13681 procedure Restore_Private_Views
13682 (Pack_Id : Entity_Id;
13683 Is_Package : Boolean := True)
13688 Dep_Elmt : Elmt_Id;
13691 procedure Restore_Nested_Formal (Formal : Entity_Id);
13692 -- Hide the generic formals of formal packages declared with box which
13693 -- were reachable in the current instantiation.
13695 ---------------------------
13696 -- Restore_Nested_Formal --
13697 ---------------------------
13699 procedure Restore_Nested_Formal (Formal : Entity_Id) is
13703 if Present (Renamed_Object (Formal))
13704 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
13708 elsif Present (Associated_Formal_Package (Formal)) then
13709 Ent := First_Entity (Formal);
13710 while Present (Ent) loop
13711 exit when Ekind (Ent) = E_Package
13712 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
13714 Set_Is_Hidden (Ent);
13715 Set_Is_Potentially_Use_Visible (Ent, False);
13717 -- If package, then recurse
13719 if Ekind (Ent) = E_Package then
13720 Restore_Nested_Formal (Ent);
13726 end Restore_Nested_Formal;
13728 -- Start of processing for Restore_Private_Views
13731 M := First_Elmt (Exchanged_Views);
13732 while Present (M) loop
13735 -- Subtypes of types whose views have been exchanged, and that are
13736 -- defined within the instance, were not on the Private_Dependents
13737 -- list on entry to the instance, so they have to be exchanged
13738 -- explicitly now, in order to remain consistent with the view of the
13741 if Ekind_In (Typ, E_Private_Type,
13742 E_Limited_Private_Type,
13743 E_Record_Type_With_Private)
13745 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
13746 while Present (Dep_Elmt) loop
13747 Dep_Typ := Node (Dep_Elmt);
13749 if Scope (Dep_Typ) = Pack_Id
13750 and then Present (Full_View (Dep_Typ))
13752 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
13753 Exchange_Declarations (Dep_Typ);
13756 Next_Elmt (Dep_Elmt);
13760 Exchange_Declarations (Node (M));
13764 if No (Pack_Id) then
13768 -- Make the generic formal parameters private, and make the formal types
13769 -- into subtypes of the actuals again.
13771 E := First_Entity (Pack_Id);
13772 while Present (E) loop
13773 Set_Is_Hidden (E, True);
13776 and then Nkind (Parent (E)) = N_Subtype_Declaration
13778 -- If the actual for E is itself a generic actual type from
13779 -- an enclosing instance, E is still a generic actual type
13780 -- outside of the current instance. This matter when resolving
13781 -- an overloaded call that may be ambiguous in the enclosing
13782 -- instance, when two of its actuals coincide.
13784 if Is_Entity_Name (Subtype_Indication (Parent (E)))
13785 and then Is_Generic_Actual_Type
13786 (Entity (Subtype_Indication (Parent (E))))
13790 Set_Is_Generic_Actual_Type (E, False);
13793 -- An unusual case of aliasing: the actual may also be directly
13794 -- visible in the generic, and be private there, while it is fully
13795 -- visible in the context of the instance. The internal subtype
13796 -- is private in the instance but has full visibility like its
13797 -- parent in the enclosing scope. This enforces the invariant that
13798 -- the privacy status of all private dependents of a type coincide
13799 -- with that of the parent type. This can only happen when a
13800 -- generic child unit is instantiated within a sibling.
13802 if Is_Private_Type (E)
13803 and then not Is_Private_Type (Etype (E))
13805 Exchange_Declarations (E);
13808 elsif Ekind (E) = E_Package then
13810 -- The end of the renaming list is the renaming of the generic
13811 -- package itself. If the instance is a subprogram, all entities
13812 -- in the corresponding package are renamings. If this entity is
13813 -- a formal package, make its own formals private as well. The
13814 -- actual in this case is itself the renaming of an instantiation.
13815 -- If the entity is not a package renaming, it is the entity
13816 -- created to validate formal package actuals: ignore it.
13818 -- If the actual is itself a formal package for the enclosing
13819 -- generic, or the actual for such a formal package, it remains
13820 -- visible on exit from the instance, and therefore nothing needs
13821 -- to be done either, except to keep it accessible.
13823 if Is_Package and then Renamed_Object (E) = Pack_Id then
13826 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
13830 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id)
13832 Set_Is_Hidden (E, False);
13836 Act_P : constant Entity_Id := Renamed_Object (E);
13840 Id := First_Entity (Act_P);
13842 and then Id /= First_Private_Entity (Act_P)
13844 exit when Ekind (Id) = E_Package
13845 and then Renamed_Object (Id) = Act_P;
13847 Set_Is_Hidden (Id, True);
13848 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
13850 if Ekind (Id) = E_Package then
13851 Restore_Nested_Formal (Id);
13862 end Restore_Private_Views;
13869 (Gen_Unit : Entity_Id;
13870 Act_Unit : Entity_Id)
13874 Set_Instance_Env (Gen_Unit, Act_Unit);
13877 ----------------------------
13878 -- Save_Global_References --
13879 ----------------------------
13881 procedure Save_Global_References (Templ : Node_Id) is
13883 -- ??? it is horrible to use global variables in highly recursive code
13886 -- The entity of the current associated node
13888 Gen_Scope : Entity_Id;
13889 -- The scope of the generic for which references are being saved
13892 -- The current associated node
13894 function Is_Global (E : Entity_Id) return Boolean;
13895 -- Check whether entity is defined outside of generic unit. Examine the
13896 -- scope of an entity, and the scope of the scope, etc, until we find
13897 -- either Standard, in which case the entity is global, or the generic
13898 -- unit itself, which indicates that the entity is local. If the entity
13899 -- is the generic unit itself, as in the case of a recursive call, or
13900 -- the enclosing generic unit, if different from the current scope, then
13901 -- it is local as well, because it will be replaced at the point of
13902 -- instantiation. On the other hand, if it is a reference to a child
13903 -- unit of a common ancestor, which appears in an instantiation, it is
13904 -- global because it is used to denote a specific compilation unit at
13905 -- the time the instantiations will be analyzed.
13907 procedure Qualify_Universal_Operands
13909 Func_Call : Node_Id);
13910 -- Op denotes a binary or unary operator in generic template Templ. Node
13911 -- Func_Call is the function call alternative of the operator within the
13912 -- the analyzed copy of the template. Change each operand which yields a
13913 -- universal type by wrapping it into a qualified expression
13915 -- Actual_Typ'(Operand)
13917 -- where Actual_Typ is the type of corresponding actual parameter of
13918 -- Operand in Func_Call.
13920 procedure Reset_Entity (N : Node_Id);
13921 -- Save semantic information on global entity so that it is not resolved
13922 -- again at instantiation time.
13924 procedure Save_Entity_Descendants (N : Node_Id);
13925 -- Apply Save_Global_References to the two syntactic descendants of
13926 -- non-terminal nodes that carry an Associated_Node and are processed
13927 -- through Reset_Entity. Once the global entity (if any) has been
13928 -- captured together with its type, only two syntactic descendants need
13929 -- to be traversed to complete the processing of the tree rooted at N.
13930 -- This applies to Selected_Components, Expanded_Names, and to Operator
13931 -- nodes. N can also be a character literal, identifier, or operator
13932 -- symbol node, but the call has no effect in these cases.
13934 procedure Save_Global_Defaults (N1 : Node_Id; N2 : Node_Id);
13935 -- Default actuals in nested instances must be handled specially
13936 -- because there is no link to them from the original tree. When an
13937 -- actual subprogram is given by a default, we add an explicit generic
13938 -- association for it in the instantiation node. When we save the
13939 -- global references on the name of the instance, we recover the list
13940 -- of generic associations, and add an explicit one to the original
13941 -- generic tree, through which a global actual can be preserved.
13942 -- Similarly, if a child unit is instantiated within a sibling, in the
13943 -- context of the parent, we must preserve the identifier of the parent
13944 -- so that it can be properly resolved in a subsequent instantiation.
13946 procedure Save_Global_Descendant (D : Union_Id);
13947 -- Apply Save_References recursively to the descendants of node D
13949 procedure Save_References (N : Node_Id);
13950 -- This is the recursive procedure that does the work, once the
13951 -- enclosing generic scope has been established.
13957 function Is_Global (E : Entity_Id) return Boolean is
13960 function Is_Instance_Node (Decl : Node_Id) return Boolean;
13961 -- Determine whether the parent node of a reference to a child unit
13962 -- denotes an instantiation or a formal package, in which case the
13963 -- reference to the child unit is global, even if it appears within
13964 -- the current scope (e.g. when the instance appears within the body
13965 -- of an ancestor).
13967 ----------------------
13968 -- Is_Instance_Node --
13969 ----------------------
13971 function Is_Instance_Node (Decl : Node_Id) return Boolean is
13973 return Nkind (Decl) in N_Generic_Instantiation
13975 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration;
13976 end Is_Instance_Node;
13978 -- Start of processing for Is_Global
13981 if E = Gen_Scope then
13984 elsif E = Standard_Standard then
13987 elsif Is_Child_Unit (E)
13988 and then (Is_Instance_Node (Parent (N2))
13989 or else (Nkind (Parent (N2)) = N_Expanded_Name
13990 and then N2 = Selector_Name (Parent (N2))
13992 Is_Instance_Node (Parent (Parent (N2)))))
13998 while Se /= Gen_Scope loop
13999 if Se = Standard_Standard then
14010 --------------------------------
14011 -- Qualify_Universal_Operands --
14012 --------------------------------
14014 procedure Qualify_Universal_Operands
14016 Func_Call : Node_Id)
14018 procedure Qualify_Operand (Opnd : Node_Id; Actual : Node_Id);
14019 -- Rewrite operand Opnd as a qualified expression of the form
14021 -- Actual_Typ'(Opnd)
14023 -- where Actual is the corresponding actual parameter of Opnd in
14024 -- function call Func_Call.
14026 function Qualify_Type
14028 Typ : Entity_Id) return Node_Id;
14029 -- Qualify type Typ by creating a selected component of the form
14031 -- Scope_Of_Typ.Typ
14033 ---------------------
14034 -- Qualify_Operand --
14035 ---------------------
14037 procedure Qualify_Operand (Opnd : Node_Id; Actual : Node_Id) is
14038 Loc : constant Source_Ptr := Sloc (Opnd);
14039 Typ : constant Entity_Id := Etype (Actual);
14044 -- Qualify the operand when it is of a universal type. Note that
14045 -- the template is unanalyzed and it is not possible to directly
14046 -- query the type. This transformation is not done when the type
14047 -- of the actual is internally generated because the type will be
14048 -- regenerated in the instance.
14050 if Yields_Universal_Type (Opnd)
14051 and then Comes_From_Source (Typ)
14052 and then not Is_Hidden (Typ)
14054 -- The type of the actual may be a global reference. Save this
14055 -- information by creating a reference to it.
14057 if Is_Global (Typ) then
14058 Mark := New_Occurrence_Of (Typ, Loc);
14060 -- Otherwise rely on resolution to find the proper type within
14064 Mark := Qualify_Type (Loc, Typ);
14068 Make_Qualified_Expression (Loc,
14069 Subtype_Mark => Mark,
14070 Expression => Relocate_Node (Opnd));
14072 -- Mark the qualification to distinguish it from other source
14073 -- constructs and signal the instantiation mechanism that this
14074 -- node requires special processing. See Copy_Generic_Node for
14077 Set_Is_Qualified_Universal_Literal (Qual);
14079 Rewrite (Opnd, Qual);
14081 end Qualify_Operand;
14087 function Qualify_Type
14089 Typ : Entity_Id) return Node_Id
14091 Scop : constant Entity_Id := Scope (Typ);
14095 Result := Make_Identifier (Loc, Chars (Typ));
14097 if Present (Scop) and then not Is_Generic_Unit (Scop) then
14099 Make_Selected_Component (Loc,
14100 Prefix => Make_Identifier (Loc, Chars (Scop)),
14101 Selector_Name => Result);
14109 Actuals : constant List_Id := Parameter_Associations (Func_Call);
14111 -- Start of processing for Qualify_Universal_Operands
14114 if Nkind (Op) in N_Binary_Op then
14115 Qualify_Operand (Left_Opnd (Op), First (Actuals));
14116 Qualify_Operand (Right_Opnd (Op), Next (First (Actuals)));
14118 elsif Nkind (Op) in N_Unary_Op then
14119 Qualify_Operand (Right_Opnd (Op), First (Actuals));
14121 end Qualify_Universal_Operands;
14127 procedure Reset_Entity (N : Node_Id) is
14128 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
14129 -- If the type of N2 is global to the generic unit, save the type in
14130 -- the generic node. Just as we perform name capture for explicit
14131 -- references within the generic, we must capture the global types
14132 -- of local entities because they may participate in resolution in
14135 function Top_Ancestor (E : Entity_Id) return Entity_Id;
14136 -- Find the ultimate ancestor of the current unit. If it is not a
14137 -- generic unit, then the name of the current unit in the prefix of
14138 -- an expanded name must be replaced with its generic homonym to
14139 -- ensure that it will be properly resolved in an instance.
14141 ---------------------
14142 -- Set_Global_Type --
14143 ---------------------
14145 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
14146 Typ : constant Entity_Id := Etype (N2);
14149 Set_Etype (N, Typ);
14151 -- If the entity of N is not the associated node, this is a
14152 -- nested generic and it has an associated node as well, whose
14153 -- type is already the full view (see below). Indicate that the
14154 -- original node has a private view.
14156 if Entity (N) /= N2 and then Has_Private_View (Entity (N)) then
14157 Set_Has_Private_View (N);
14160 -- If not a private type, nothing else to do
14162 if not Is_Private_Type (Typ) then
14163 if Is_Array_Type (Typ)
14164 and then Is_Private_Type (Component_Type (Typ))
14166 Set_Has_Private_View (N);
14169 -- If it is a derivation of a private type in a context where no
14170 -- full view is needed, nothing to do either.
14172 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
14175 -- Otherwise mark the type for flipping and use the full view when
14179 Set_Has_Private_View (N);
14181 if Present (Full_View (Typ)) then
14182 Set_Etype (N2, Full_View (Typ));
14186 if Is_Floating_Point_Type (Typ)
14187 and then Has_Dimension_System (Typ)
14189 Copy_Dimensions (N2, N);
14192 end Set_Global_Type;
14198 function Top_Ancestor (E : Entity_Id) return Entity_Id is
14203 while Is_Child_Unit (Par) loop
14204 Par := Scope (Par);
14210 -- Start of processing for Reset_Entity
14213 N2 := Get_Associated_Node (N);
14216 if Present (E) then
14218 -- If the node is an entry call to an entry in an enclosing task,
14219 -- it is rewritten as a selected component. No global entity to
14220 -- preserve in this case, since the expansion will be redone in
14223 if not Nkind_In (E, N_Defining_Character_Literal,
14224 N_Defining_Identifier,
14225 N_Defining_Operator_Symbol)
14227 Set_Associated_Node (N, Empty);
14228 Set_Etype (N, Empty);
14232 -- If the entity is an itype created as a subtype of an access
14233 -- type with a null exclusion restore source entity for proper
14234 -- visibility. The itype will be created anew in the instance.
14237 and then Ekind (E) = E_Access_Subtype
14238 and then Is_Entity_Name (N)
14239 and then Chars (Etype (E)) = Chars (N)
14242 Set_Entity (N2, E);
14246 if Is_Global (E) then
14248 -- If the entity is a package renaming that is the prefix of
14249 -- an expanded name, it has been rewritten as the renamed
14250 -- package, which is necessary semantically but complicates
14251 -- ASIS tree traversal, so we recover the original entity to
14252 -- expose the renaming. Take into account that the context may
14253 -- be a nested generic, that the original node may itself have
14254 -- an associated node that had better be an entity, and that
14255 -- the current node is still a selected component.
14257 if Ekind (E) = E_Package
14258 and then Nkind (N) = N_Selected_Component
14259 and then Nkind (Parent (N)) = N_Expanded_Name
14260 and then Present (Original_Node (N2))
14261 and then Is_Entity_Name (Original_Node (N2))
14262 and then Present (Entity (Original_Node (N2)))
14264 if Is_Global (Entity (Original_Node (N2))) then
14265 N2 := Original_Node (N2);
14266 Set_Associated_Node (N, N2);
14267 Set_Global_Type (N, N2);
14269 -- Renaming is local, and will be resolved in instance
14272 Set_Associated_Node (N, Empty);
14273 Set_Etype (N, Empty);
14277 Set_Global_Type (N, N2);
14280 elsif Nkind (N) = N_Op_Concat
14281 and then Is_Generic_Type (Etype (N2))
14282 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
14284 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
14285 and then Is_Intrinsic_Subprogram (E)
14289 -- Entity is local. Mark generic node as unresolved. Note that now
14290 -- it does not have an entity.
14293 Set_Associated_Node (N, Empty);
14294 Set_Etype (N, Empty);
14297 if Nkind (Parent (N)) in N_Generic_Instantiation
14298 and then N = Name (Parent (N))
14300 Save_Global_Defaults (Parent (N), Parent (N2));
14303 elsif Nkind (Parent (N)) = N_Selected_Component
14304 and then Nkind (Parent (N2)) = N_Expanded_Name
14306 if Is_Global (Entity (Parent (N2))) then
14307 Change_Selected_Component_To_Expanded_Name (Parent (N));
14308 Set_Associated_Node (Parent (N), Parent (N2));
14309 Set_Global_Type (Parent (N), Parent (N2));
14310 Save_Entity_Descendants (N);
14312 -- If this is a reference to the current generic entity, replace
14313 -- by the name of the generic homonym of the current package. This
14314 -- is because in an instantiation Par.P.Q will not resolve to the
14315 -- name of the instance, whose enclosing scope is not necessarily
14316 -- Par. We use the generic homonym rather that the name of the
14317 -- generic itself because it may be hidden by a local declaration.
14319 elsif In_Open_Scopes (Entity (Parent (N2)))
14321 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
14323 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
14324 Rewrite (Parent (N),
14325 Make_Identifier (Sloc (N),
14327 Chars (Generic_Homonym (Entity (Parent (N2))))));
14329 Rewrite (Parent (N),
14330 Make_Identifier (Sloc (N),
14331 Chars => Chars (Selector_Name (Parent (N2)))));
14335 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation
14336 and then Parent (N) = Name (Parent (Parent (N)))
14338 Save_Global_Defaults
14339 (Parent (Parent (N)), Parent (Parent (N2)));
14342 -- A selected component may denote a static constant that has been
14343 -- folded. If the static constant is global to the generic, capture
14344 -- its value. Otherwise the folding will happen in any instantiation.
14346 elsif Nkind (Parent (N)) = N_Selected_Component
14347 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal)
14349 if Present (Entity (Original_Node (Parent (N2))))
14350 and then Is_Global (Entity (Original_Node (Parent (N2))))
14352 Rewrite (Parent (N), New_Copy (Parent (N2)));
14353 Set_Analyzed (Parent (N), False);
14356 -- A selected component may be transformed into a parameterless
14357 -- function call. If the called entity is global, rewrite the node
14358 -- appropriately, i.e. as an extended name for the global entity.
14360 elsif Nkind (Parent (N)) = N_Selected_Component
14361 and then Nkind (Parent (N2)) = N_Function_Call
14362 and then N = Selector_Name (Parent (N))
14364 if No (Parameter_Associations (Parent (N2))) then
14365 if Is_Global (Entity (Name (Parent (N2)))) then
14366 Change_Selected_Component_To_Expanded_Name (Parent (N));
14367 Set_Associated_Node (Parent (N), Name (Parent (N2)));
14368 Set_Global_Type (Parent (N), Name (Parent (N2)));
14369 Save_Entity_Descendants (N);
14372 Set_Is_Prefixed_Call (Parent (N));
14373 Set_Associated_Node (N, Empty);
14374 Set_Etype (N, Empty);
14377 -- In Ada 2005, X.F may be a call to a primitive operation,
14378 -- rewritten as F (X). This rewriting will be done again in an
14379 -- instance, so keep the original node. Global entities will be
14380 -- captured as for other constructs. Indicate that this must
14381 -- resolve as a call, to prevent accidental overloading in the
14382 -- instance, if both a component and a primitive operation appear
14386 Set_Is_Prefixed_Call (Parent (N));
14389 -- Entity is local. Reset in generic unit, so that node is resolved
14390 -- anew at the point of instantiation.
14393 Set_Associated_Node (N, Empty);
14394 Set_Etype (N, Empty);
14398 -----------------------------
14399 -- Save_Entity_Descendants --
14400 -----------------------------
14402 procedure Save_Entity_Descendants (N : Node_Id) is
14405 when N_Binary_Op =>
14406 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
14407 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
14410 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
14412 when N_Expanded_Name |
14413 N_Selected_Component =>
14414 Save_Global_Descendant (Union_Id (Prefix (N)));
14415 Save_Global_Descendant (Union_Id (Selector_Name (N)));
14417 when N_Identifier |
14418 N_Character_Literal |
14419 N_Operator_Symbol =>
14423 raise Program_Error;
14425 end Save_Entity_Descendants;
14427 --------------------------
14428 -- Save_Global_Defaults --
14429 --------------------------
14431 procedure Save_Global_Defaults (N1 : Node_Id; N2 : Node_Id) is
14432 Loc : constant Source_Ptr := Sloc (N1);
14433 Assoc2 : constant List_Id := Generic_Associations (N2);
14434 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
14441 Actual : Entity_Id;
14444 Assoc1 := Generic_Associations (N1);
14446 if Present (Assoc1) then
14447 Act1 := First (Assoc1);
14450 Set_Generic_Associations (N1, New_List);
14451 Assoc1 := Generic_Associations (N1);
14454 if Present (Assoc2) then
14455 Act2 := First (Assoc2);
14460 while Present (Act1) and then Present (Act2) loop
14465 -- Find the associations added for default subprograms
14467 if Present (Act2) then
14468 while Nkind (Act2) /= N_Generic_Association
14469 or else No (Entity (Selector_Name (Act2)))
14470 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
14475 -- Add a similar association if the default is global. The
14476 -- renaming declaration for the actual has been analyzed, and
14477 -- its alias is the program it renames. Link the actual in the
14478 -- original generic tree with the node in the analyzed tree.
14480 while Present (Act2) loop
14481 Subp := Entity (Selector_Name (Act2));
14482 Def := Explicit_Generic_Actual_Parameter (Act2);
14484 -- Following test is defence against rubbish errors
14486 if No (Alias (Subp)) then
14490 -- Retrieve the resolved actual from the renaming declaration
14491 -- created for the instantiated formal.
14493 Actual := Entity (Name (Parent (Parent (Subp))));
14494 Set_Entity (Def, Actual);
14495 Set_Etype (Def, Etype (Actual));
14497 if Is_Global (Actual) then
14499 Make_Generic_Association (Loc,
14501 New_Occurrence_Of (Subp, Loc),
14502 Explicit_Generic_Actual_Parameter =>
14503 New_Occurrence_Of (Actual, Loc));
14505 Set_Associated_Node
14506 (Explicit_Generic_Actual_Parameter (Ndec), Def);
14508 Append (Ndec, Assoc1);
14510 -- If there are other defaults, add a dummy association in case
14511 -- there are other defaulted formals with the same name.
14513 elsif Present (Next (Act2)) then
14515 Make_Generic_Association (Loc,
14517 New_Occurrence_Of (Subp, Loc),
14518 Explicit_Generic_Actual_Parameter => Empty);
14520 Append (Ndec, Assoc1);
14527 if Nkind (Name (N1)) = N_Identifier
14528 and then Is_Child_Unit (Gen_Id)
14529 and then Is_Global (Gen_Id)
14530 and then Is_Generic_Unit (Scope (Gen_Id))
14531 and then In_Open_Scopes (Scope (Gen_Id))
14533 -- This is an instantiation of a child unit within a sibling, so
14534 -- that the generic parent is in scope. An eventual instance must
14535 -- occur within the scope of an instance of the parent. Make name
14536 -- in instance into an expanded name, to preserve the identifier
14537 -- of the parent, so it can be resolved subsequently.
14539 Rewrite (Name (N2),
14540 Make_Expanded_Name (Loc,
14541 Chars => Chars (Gen_Id),
14542 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
14543 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
14544 Set_Entity (Name (N2), Gen_Id);
14546 Rewrite (Name (N1),
14547 Make_Expanded_Name (Loc,
14548 Chars => Chars (Gen_Id),
14549 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
14550 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
14552 Set_Associated_Node (Name (N1), Name (N2));
14553 Set_Associated_Node (Prefix (Name (N1)), Empty);
14554 Set_Associated_Node
14555 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
14556 Set_Etype (Name (N1), Etype (Gen_Id));
14558 end Save_Global_Defaults;
14560 ----------------------------
14561 -- Save_Global_Descendant --
14562 ----------------------------
14564 procedure Save_Global_Descendant (D : Union_Id) is
14568 if D in Node_Range then
14569 if D = Union_Id (Empty) then
14572 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
14573 Save_References (Node_Id (D));
14576 elsif D in List_Range then
14577 pragma Assert (D /= Union_Id (No_List));
14578 -- Because No_List = Empty, which is in Node_Range above
14580 if Is_Empty_List (List_Id (D)) then
14584 N1 := First (List_Id (D));
14585 while Present (N1) loop
14586 Save_References (N1);
14591 -- Element list or other non-node field, nothing to do
14596 end Save_Global_Descendant;
14598 ---------------------
14599 -- Save_References --
14600 ---------------------
14602 -- This is the recursive procedure that does the work once the enclosing
14603 -- generic scope has been established. We have to treat specially a
14604 -- number of node rewritings that are required by semantic processing
14605 -- and which change the kind of nodes in the generic copy: typically
14606 -- constant-folding, replacing an operator node by a string literal, or
14607 -- a selected component by an expanded name. In each of those cases, the
14608 -- transformation is propagated to the generic unit.
14610 procedure Save_References (N : Node_Id) is
14611 Loc : constant Source_Ptr := Sloc (N);
14613 function Requires_Delayed_Save (Nod : Node_Id) return Boolean;
14614 -- Determine whether arbitrary node Nod requires delayed capture of
14615 -- global references within its aspect specifications.
14617 procedure Save_References_In_Aggregate (N : Node_Id);
14618 -- Save all global references in [extension] aggregate node N
14620 procedure Save_References_In_Char_Lit_Or_Op_Symbol (N : Node_Id);
14621 -- Save all global references in a character literal or operator
14622 -- symbol denoted by N.
14624 procedure Save_References_In_Descendants (N : Node_Id);
14625 -- Save all global references in all descendants of node N
14627 procedure Save_References_In_Identifier (N : Node_Id);
14628 -- Save all global references in identifier node N
14630 procedure Save_References_In_Operator (N : Node_Id);
14631 -- Save all global references in operator node N
14633 procedure Save_References_In_Pragma (Prag : Node_Id);
14634 -- Save all global references found within the expression of pragma
14637 ---------------------------
14638 -- Requires_Delayed_Save --
14639 ---------------------------
14641 function Requires_Delayed_Save (Nod : Node_Id) return Boolean is
14643 -- Generic packages and subprograms require delayed capture of
14644 -- global references within their aspects due to the timing of
14645 -- annotation analysis.
14647 if Nkind_In (Nod, N_Generic_Package_Declaration,
14648 N_Generic_Subprogram_Declaration,
14650 N_Package_Body_Stub,
14652 N_Subprogram_Body_Stub)
14654 -- Since the capture of global references is done on the
14655 -- unanalyzed generic template, there is no information around
14656 -- to infer the context. Use the Associated_Entity linkages to
14657 -- peek into the analyzed generic copy and determine what the
14658 -- template corresponds to.
14660 if Nod = Templ then
14662 Is_Generic_Declaration_Or_Body
14663 (Unit_Declaration_Node
14664 (Associated_Entity (Defining_Entity (Nod))));
14666 -- Otherwise the generic unit being processed is not the top
14667 -- level template. It is safe to capture of global references
14668 -- within the generic unit because at this point the top level
14669 -- copy is fully analyzed.
14675 -- Otherwise capture the global references without interference
14680 end Requires_Delayed_Save;
14682 ----------------------------------
14683 -- Save_References_In_Aggregate --
14684 ----------------------------------
14686 procedure Save_References_In_Aggregate (N : Node_Id) is
14688 Qual : Node_Id := Empty;
14689 Typ : Entity_Id := Empty;
14691 use Atree.Unchecked_Access;
14692 -- This code section is part of implementing an untyped tree
14693 -- traversal, so it needs direct access to node fields.
14696 N2 := Get_Associated_Node (N);
14698 if Present (N2) then
14701 -- In an instance within a generic, use the name of the actual
14702 -- and not the original generic parameter. If the actual is
14703 -- global in the current generic it must be preserved for its
14706 if Nkind (Parent (Typ)) = N_Subtype_Declaration
14707 and then Present (Generic_Parent_Type (Parent (Typ)))
14709 Typ := Base_Type (Typ);
14710 Set_Etype (N2, Typ);
14714 if No (N2) or else No (Typ) or else not Is_Global (Typ) then
14715 Set_Associated_Node (N, Empty);
14717 -- If the aggregate is an actual in a call, it has been
14718 -- resolved in the current context, to some local type. The
14719 -- enclosing call may have been disambiguated by the aggregate,
14720 -- and this disambiguation might fail at instantiation time
14721 -- because the type to which the aggregate did resolve is not
14722 -- preserved. In order to preserve some of this information,
14723 -- wrap the aggregate in a qualified expression, using the id
14724 -- of its type. For further disambiguation we qualify the type
14725 -- name with its scope (if visible) because both id's will have
14726 -- corresponding entities in an instance. This resolves most of
14727 -- the problems with missing type information on aggregates in
14731 and then Nkind (N2) = Nkind (N)
14732 and then Nkind (Parent (N2)) in N_Subprogram_Call
14733 and then Present (Typ)
14734 and then Comes_From_Source (Typ)
14736 Nam := Make_Identifier (Loc, Chars (Typ));
14738 if Is_Immediately_Visible (Scope (Typ)) then
14740 Make_Selected_Component (Loc,
14742 Make_Identifier (Loc, Chars (Scope (Typ))),
14743 Selector_Name => Nam);
14747 Make_Qualified_Expression (Loc,
14748 Subtype_Mark => Nam,
14749 Expression => Relocate_Node (N));
14753 Save_Global_Descendant (Field1 (N));
14754 Save_Global_Descendant (Field2 (N));
14755 Save_Global_Descendant (Field3 (N));
14756 Save_Global_Descendant (Field5 (N));
14758 if Present (Qual) then
14761 end Save_References_In_Aggregate;
14763 ----------------------------------------------
14764 -- Save_References_In_Char_Lit_Or_Op_Symbol --
14765 ----------------------------------------------
14767 procedure Save_References_In_Char_Lit_Or_Op_Symbol (N : Node_Id) is
14769 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
14772 elsif Nkind (N) = N_Operator_Symbol
14773 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
14775 Change_Operator_Symbol_To_String_Literal (N);
14777 end Save_References_In_Char_Lit_Or_Op_Symbol;
14779 ------------------------------------
14780 -- Save_References_In_Descendants --
14781 ------------------------------------
14783 procedure Save_References_In_Descendants (N : Node_Id) is
14784 use Atree.Unchecked_Access;
14785 -- This code section is part of implementing an untyped tree
14786 -- traversal, so it needs direct access to node fields.
14789 Save_Global_Descendant (Field1 (N));
14790 Save_Global_Descendant (Field2 (N));
14791 Save_Global_Descendant (Field3 (N));
14792 Save_Global_Descendant (Field4 (N));
14793 Save_Global_Descendant (Field5 (N));
14794 end Save_References_In_Descendants;
14796 -----------------------------------
14797 -- Save_References_In_Identifier --
14798 -----------------------------------
14800 procedure Save_References_In_Identifier (N : Node_Id) is
14802 -- The node did not undergo a transformation
14804 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
14806 -- If this is a discriminant reference, always save it. It is
14807 -- used in the instance to find the corresponding discriminant
14808 -- positionally rather than by name.
14810 Set_Original_Discriminant
14811 (N, Original_Discriminant (Get_Associated_Node (N)));
14814 -- The analysis of the generic copy transformed the identifier
14815 -- into another construct. Propagate the changes to the template.
14818 N2 := Get_Associated_Node (N);
14820 -- The identifier denotes a call to a parameterless function.
14821 -- Mark the node as resolved when the function is external.
14823 if Nkind (N2) = N_Function_Call then
14824 E := Entity (Name (N2));
14826 if Present (E) and then Is_Global (E) then
14827 Set_Etype (N, Etype (N2));
14829 Set_Associated_Node (N, Empty);
14830 Set_Etype (N, Empty);
14833 -- The identifier denotes a named number that was constant
14834 -- folded. Preserve the original name for ASIS and undo the
14835 -- constant folding which will be repeated in the instance.
14837 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal)
14838 and then Is_Entity_Name (Original_Node (N2))
14840 Set_Associated_Node (N, Original_Node (N2));
14843 -- The identifier resolved to a string literal. Propagate this
14844 -- information to the generic template.
14846 elsif Nkind (N2) = N_String_Literal then
14847 Rewrite (N, New_Copy (N2));
14849 -- The identifier is rewritten as a dereference if it is the
14850 -- prefix of an implicit dereference. Preserve the original
14851 -- tree as the analysis of the instance will expand the node
14852 -- again, but preserve the resolved entity if it is global.
14854 elsif Nkind (N2) = N_Explicit_Dereference then
14855 if Is_Entity_Name (Prefix (N2))
14856 and then Present (Entity (Prefix (N2)))
14857 and then Is_Global (Entity (Prefix (N2)))
14859 Set_Associated_Node (N, Prefix (N2));
14861 elsif Nkind (Prefix (N2)) = N_Function_Call
14862 and then Present (Entity (Name (Prefix (N2))))
14863 and then Is_Global (Entity (Name (Prefix (N2))))
14866 Make_Explicit_Dereference (Loc,
14868 Make_Function_Call (Loc,
14871 (Entity (Name (Prefix (N2))), Loc))));
14874 Set_Associated_Node (N, Empty);
14875 Set_Etype (N, Empty);
14878 -- The subtype mark of a nominally unconstrained object is
14879 -- rewritten as a subtype indication using the bounds of the
14880 -- expression. Recover the original subtype mark.
14882 elsif Nkind (N2) = N_Subtype_Indication
14883 and then Is_Entity_Name (Original_Node (N2))
14885 Set_Associated_Node (N, Original_Node (N2));
14889 end Save_References_In_Identifier;
14891 ---------------------------------
14892 -- Save_References_In_Operator --
14893 ---------------------------------
14895 procedure Save_References_In_Operator (N : Node_Id) is
14897 -- The node did not undergo a transformation
14899 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
14900 if Nkind (N) = N_Op_Concat then
14901 Set_Is_Component_Left_Opnd (N,
14902 Is_Component_Left_Opnd (Get_Associated_Node (N)));
14904 Set_Is_Component_Right_Opnd (N,
14905 Is_Component_Right_Opnd (Get_Associated_Node (N)));
14910 -- The analysis of the generic copy transformed the operator into
14911 -- some other construct. Propagate the changes to the template if
14915 N2 := Get_Associated_Node (N);
14917 -- The operator resoved to a function call
14919 if Nkind (N2) = N_Function_Call then
14921 -- Add explicit qualifications in the generic template for
14922 -- all operands of universal type. This aids resolution by
14923 -- preserving the actual type of a literal or an attribute
14924 -- that yields a universal result.
14926 Qualify_Universal_Operands (N, N2);
14928 E := Entity (Name (N2));
14930 if Present (E) and then Is_Global (E) then
14931 Set_Etype (N, Etype (N2));
14933 Set_Associated_Node (N, Empty);
14934 Set_Etype (N, Empty);
14937 -- The operator was folded into a literal
14939 elsif Nkind_In (N2, N_Integer_Literal,
14943 if Present (Original_Node (N2))
14944 and then Nkind (Original_Node (N2)) = Nkind (N)
14946 -- Operation was constant-folded. Whenever possible,
14947 -- recover semantic information from unfolded node,
14950 Set_Associated_Node (N, Original_Node (N2));
14952 if Nkind (N) = N_Op_Concat then
14953 Set_Is_Component_Left_Opnd (N,
14954 Is_Component_Left_Opnd (Get_Associated_Node (N)));
14955 Set_Is_Component_Right_Opnd (N,
14956 Is_Component_Right_Opnd (Get_Associated_Node (N)));
14961 -- Propagate the constant folding back to the template
14964 Rewrite (N, New_Copy (N2));
14965 Set_Analyzed (N, False);
14968 -- The operator was folded into an enumeration literal. Retain
14969 -- the entity to avoid spurious ambiguities if it is overloaded
14970 -- at the point of instantiation or inlining.
14972 elsif Nkind (N2) = N_Identifier
14973 and then Ekind (Entity (N2)) = E_Enumeration_Literal
14975 Rewrite (N, New_Copy (N2));
14976 Set_Analyzed (N, False);
14980 -- Complete the operands check if node has not been constant
14983 if Nkind (N) in N_Op then
14984 Save_Entity_Descendants (N);
14986 end Save_References_In_Operator;
14988 -------------------------------
14989 -- Save_References_In_Pragma --
14990 -------------------------------
14992 procedure Save_References_In_Pragma (Prag : Node_Id) is
14994 Do_Save : Boolean := True;
14996 use Atree.Unchecked_Access;
14997 -- This code section is part of implementing an untyped tree
14998 -- traversal, so it needs direct access to node fields.
15001 -- Do not save global references in pragmas generated from aspects
15002 -- because the pragmas will be regenerated at instantiation time.
15004 if From_Aspect_Specification (Prag) then
15007 -- The capture of global references within contract-related source
15008 -- pragmas associated with generic packages, subprograms or their
15009 -- respective bodies must be delayed due to timing of annotation
15010 -- analysis. Global references are still captured in routine
15011 -- Save_Global_References_In_Contract.
15013 elsif Is_Generic_Contract_Pragma (Prag) and then Prag /= Templ then
15014 if Is_Package_Contract_Annotation (Prag) then
15015 Context := Find_Related_Package_Or_Body (Prag);
15017 pragma Assert (Is_Subprogram_Contract_Annotation (Prag));
15018 Context := Find_Related_Declaration_Or_Body (Prag);
15021 -- The use of Original_Node accounts for the case when the
15022 -- related context is generic template.
15024 if Requires_Delayed_Save (Original_Node (Context)) then
15029 -- For all other cases, save all global references within the
15030 -- descendants, but skip the following semantic fields:
15032 -- Field1 - Next_Pragma
15033 -- Field3 - Corresponding_Aspect
15034 -- Field5 - Next_Rep_Item
15037 Save_Global_Descendant (Field2 (Prag));
15038 Save_Global_Descendant (Field4 (Prag));
15040 end Save_References_In_Pragma;
15042 -- Start of processing for Save_References
15050 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then
15051 Save_References_In_Aggregate (N);
15053 -- Character literals, operator symbols
15055 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then
15056 Save_References_In_Char_Lit_Or_Op_Symbol (N);
15058 -- Defining identifiers
15060 elsif Nkind (N) in N_Entity then
15065 elsif Nkind (N) = N_Identifier then
15066 Save_References_In_Identifier (N);
15070 elsif Nkind (N) in N_Op then
15071 Save_References_In_Operator (N);
15075 elsif Nkind (N) = N_Pragma then
15076 Save_References_In_Pragma (N);
15079 Save_References_In_Descendants (N);
15082 -- Save all global references found within the aspect specifications
15083 -- of the related node.
15085 if Permits_Aspect_Specifications (N) and then Has_Aspects (N) then
15087 -- The capture of global references within aspects associated with
15088 -- generic packages, subprograms or their bodies must be delayed
15089 -- due to timing of annotation analysis. Global references are
15090 -- still captured in routine Save_Global_References_In_Contract.
15092 if Requires_Delayed_Save (N) then
15095 -- Otherwise save all global references within the aspects
15098 Save_Global_References_In_Aspects (N);
15101 end Save_References;
15103 -- Start of processing for Save_Global_References
15106 Gen_Scope := Current_Scope;
15108 -- If the generic unit is a child unit, references to entities in the
15109 -- parent are treated as local, because they will be resolved anew in
15110 -- the context of the instance of the parent.
15112 while Is_Child_Unit (Gen_Scope)
15113 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
15115 Gen_Scope := Scope (Gen_Scope);
15118 Save_References (Templ);
15119 end Save_Global_References;
15121 ---------------------------------------
15122 -- Save_Global_References_In_Aspects --
15123 ---------------------------------------
15125 procedure Save_Global_References_In_Aspects (N : Node_Id) is
15130 Asp := First (Aspect_Specifications (N));
15131 while Present (Asp) loop
15132 Expr := Expression (Asp);
15134 if Present (Expr) then
15135 Save_Global_References (Expr);
15140 end Save_Global_References_In_Aspects;
15142 ------------------------------------------
15143 -- Set_Copied_Sloc_For_Inherited_Pragma --
15144 ------------------------------------------
15146 procedure Set_Copied_Sloc_For_Inherited_Pragma
15151 Create_Instantiation_Source (N, E,
15152 Inlined_Body => False,
15153 Inherited_Pragma => True,
15154 Factor => S_Adjustment);
15155 end Set_Copied_Sloc_For_Inherited_Pragma;
15157 --------------------------------------
15158 -- Set_Copied_Sloc_For_Inlined_Body --
15159 --------------------------------------
15161 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
15163 Create_Instantiation_Source (N, E,
15164 Inlined_Body => True,
15165 Inherited_Pragma => False,
15166 Factor => S_Adjustment);
15167 end Set_Copied_Sloc_For_Inlined_Body;
15169 ---------------------
15170 -- Set_Instance_Of --
15171 ---------------------
15173 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
15175 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
15176 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
15177 Generic_Renamings.Increment_Last;
15178 end Set_Instance_Of;
15180 --------------------
15181 -- Set_Next_Assoc --
15182 --------------------
15184 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
15186 Generic_Renamings.Table (E).Next_In_HTable := Next;
15187 end Set_Next_Assoc;
15189 -------------------
15190 -- Start_Generic --
15191 -------------------
15193 procedure Start_Generic is
15195 -- ??? More things could be factored out in this routine.
15196 -- Should probably be done at a later stage.
15198 Generic_Flags.Append (Inside_A_Generic);
15199 Inside_A_Generic := True;
15201 Expander_Mode_Save_And_Set (False);
15204 ----------------------
15205 -- Set_Instance_Env --
15206 ----------------------
15208 procedure Set_Instance_Env
15209 (Gen_Unit : Entity_Id;
15210 Act_Unit : Entity_Id)
15212 Assertion_Status : constant Boolean := Assertions_Enabled;
15213 Save_SPARK_Mode : constant SPARK_Mode_Type := SPARK_Mode;
15214 Save_SPARK_Mode_Pragma : constant Node_Id := SPARK_Mode_Pragma;
15217 -- Regardless of the current mode, predefined units are analyzed in the
15218 -- most current Ada mode, and earlier version Ada checks do not apply
15219 -- to predefined units. Nothing needs to be done for non-internal units.
15220 -- These are always analyzed in the current mode.
15222 if Is_Internal_File_Name
15223 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
15224 Renamings_Included => True)
15226 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit);
15228 -- In Ada2012 we may want to enable assertions in an instance of a
15229 -- predefined unit, in which case we need to preserve the current
15230 -- setting for the Assertions_Enabled flag. This will become more
15231 -- critical when pre/postconditions are added to predefined units,
15232 -- as is already the case for some numeric libraries.
15234 if Ada_Version >= Ada_2012 then
15235 Assertions_Enabled := Assertion_Status;
15238 -- SPARK_Mode for an instance is the one applicable at the point of
15241 SPARK_Mode := Save_SPARK_Mode;
15242 SPARK_Mode_Pragma := Save_SPARK_Mode_Pragma;
15245 Current_Instantiated_Parent :=
15246 (Gen_Id => Gen_Unit,
15247 Act_Id => Act_Unit,
15248 Next_In_HTable => Assoc_Null);
15249 end Set_Instance_Env;
15255 procedure Switch_View (T : Entity_Id) is
15256 BT : constant Entity_Id := Base_Type (T);
15257 Priv_Elmt : Elmt_Id := No_Elmt;
15258 Priv_Sub : Entity_Id;
15261 -- T may be private but its base type may have been exchanged through
15262 -- some other occurrence, in which case there is nothing to switch
15263 -- besides T itself. Note that a private dependent subtype of a private
15264 -- type might not have been switched even if the base type has been,
15265 -- because of the last branch of Check_Private_View (see comment there).
15267 if not Is_Private_Type (BT) then
15268 Prepend_Elmt (Full_View (T), Exchanged_Views);
15269 Exchange_Declarations (T);
15273 Priv_Elmt := First_Elmt (Private_Dependents (BT));
15275 if Present (Full_View (BT)) then
15276 Prepend_Elmt (Full_View (BT), Exchanged_Views);
15277 Exchange_Declarations (BT);
15280 while Present (Priv_Elmt) loop
15281 Priv_Sub := (Node (Priv_Elmt));
15283 -- We avoid flipping the subtype if the Etype of its full view is
15284 -- private because this would result in a malformed subtype. This
15285 -- occurs when the Etype of the subtype full view is the full view of
15286 -- the base type (and since the base types were just switched, the
15287 -- subtype is pointing to the wrong view). This is currently the case
15288 -- for tagged record types, access types (maybe more?) and needs to
15289 -- be resolved. ???
15291 if Present (Full_View (Priv_Sub))
15292 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
15294 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
15295 Exchange_Declarations (Priv_Sub);
15298 Next_Elmt (Priv_Elmt);
15306 function True_Parent (N : Node_Id) return Node_Id is
15308 if Nkind (Parent (N)) = N_Subunit then
15309 return Parent (Corresponding_Stub (Parent (N)));
15315 -----------------------------
15316 -- Valid_Default_Attribute --
15317 -----------------------------
15319 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
15320 Attr_Id : constant Attribute_Id :=
15321 Get_Attribute_Id (Attribute_Name (Def));
15322 T : constant Entity_Id := Entity (Prefix (Def));
15323 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
15329 if No (T) or else T = Any_Id then
15334 F := First_Formal (Nam);
15335 while Present (F) loop
15336 Num_F := Num_F + 1;
15341 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
15342 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
15343 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
15344 Attribute_Unbiased_Rounding =>
15347 and then Is_Floating_Point_Type (T);
15349 when Attribute_Image | Attribute_Pred | Attribute_Succ |
15350 Attribute_Value | Attribute_Wide_Image |
15351 Attribute_Wide_Value =>
15352 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
15354 when Attribute_Max | Attribute_Min =>
15355 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
15357 when Attribute_Input =>
15358 OK := (Is_Fun and then Num_F = 1);
15360 when Attribute_Output | Attribute_Read | Attribute_Write =>
15361 OK := (not Is_Fun and then Num_F = 2);
15369 ("attribute reference has wrong profile for subprogram", Def);
15371 end Valid_Default_Attribute;