1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, 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. This rather complex machinery is
717 -- needed when nested instantiations are present, because the source does
718 -- not carry any indication of where the corresponding instance bodies must
719 -- be installed and frozen.
721 procedure Install_Formal_Packages
(Par
: Entity_Id
);
722 -- Install the visible part of any formal of the parent that is a formal
723 -- package. Note that for the case of a formal package with a box, this
724 -- includes the formal part of the formal package (12.7(10/2)).
726 procedure Install_Hidden_Primitives
727 (Prims_List
: in out Elist_Id
;
730 -- Remove suffix 'P' from hidden primitives of Act_T to match the
731 -- visibility of primitives of Gen_T. The list of primitives to which
732 -- the suffix is removed is added to Prims_List to restore them later.
734 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
735 -- When compiling an instance of a child unit the parent (which is
736 -- itself an instance) is an enclosing scope that must be made
737 -- immediately visible. This procedure is also used to install the non-
738 -- generic parent of a generic child unit when compiling its body, so
739 -- that full views of types in the parent are made visible.
741 -- The functions Instantiate_XXX perform various legality checks and build
742 -- the declarations for instantiated generic parameters. In all of these
743 -- Formal is the entity in the generic unit, Actual is the entity of
744 -- expression in the generic associations, and Analyzed_Formal is the
745 -- formal in the generic copy, which contains the semantic information to
746 -- be used to validate the actual.
748 function Instantiate_Object
751 Analyzed_Formal
: Node_Id
) return List_Id
;
753 function Instantiate_Type
756 Analyzed_Formal
: Node_Id
;
757 Actual_Decls
: List_Id
) return List_Id
;
759 function Instantiate_Formal_Subprogram
762 Analyzed_Formal
: Node_Id
) return Node_Id
;
764 function Instantiate_Formal_Package
767 Analyzed_Formal
: Node_Id
) return List_Id
;
768 -- If the formal package is declared with a box, special visibility rules
769 -- apply to its formals: they are in the visible part of the package. This
770 -- is true in the declarative region of the formal package, that is to say
771 -- in the enclosing generic or instantiation. For an instantiation, the
772 -- parameters of the formal package are made visible in an explicit step.
773 -- Furthermore, if the actual has a visible USE clause, these formals must
774 -- be made potentially use-visible as well. On exit from the enclosing
775 -- instantiation, the reverse must be done.
777 -- For a formal package declared without a box, there are conformance rules
778 -- that apply to the actuals in the generic declaration and the actuals of
779 -- the actual package in the enclosing instantiation. The simplest way to
780 -- apply these rules is to repeat the instantiation of the formal package
781 -- in the context of the enclosing instance, and compare the generic
782 -- associations of this instantiation with those of the actual package.
783 -- This internal instantiation only needs to contain the renamings of the
784 -- formals: the visible and private declarations themselves need not be
787 -- In Ada 2005, the formal package may be only partially parameterized.
788 -- In that case the visibility step must make visible those actuals whose
789 -- corresponding formals were given with a box. A final complication
790 -- involves inherited operations from formal derived types, which must
791 -- be visible if the type is.
793 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
794 -- Test if given node is in the main unit
796 procedure Load_Parent_Of_Generic
799 Body_Optional
: Boolean := False);
800 -- If the generic appears in a separate non-generic library unit, load the
801 -- corresponding body to retrieve the body of the generic. N is the node
802 -- for the generic instantiation, Spec is the generic package declaration.
804 -- Body_Optional is a flag that indicates that the body is being loaded to
805 -- ensure that temporaries are generated consistently when there are other
806 -- instances in the current declarative part that precede the one being
807 -- loaded. In that case a missing body is acceptable.
809 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
810 -- Within the generic part, entities in the formal package are
811 -- visible. To validate subsequent type declarations, indicate
812 -- the correspondence between the entities in the analyzed formal,
813 -- and the entities in the actual package. There are three packages
814 -- involved in the instantiation of a formal package: the parent
815 -- generic P1 which appears in the generic declaration, the fake
816 -- instantiation P2 which appears in the analyzed generic, and whose
817 -- visible entities may be used in subsequent formals, and the actual
818 -- P3 in the instance. To validate subsequent formals, me indicate
819 -- that the entities in P2 are mapped into those of P3. The mapping of
820 -- entities has to be done recursively for nested packages.
822 procedure Move_Freeze_Nodes
826 -- Freeze nodes can be generated in the analysis of a generic unit, but
827 -- will not be seen by the back-end. It is necessary to move those nodes
828 -- to the enclosing scope if they freeze an outer entity. We place them
829 -- at the end of the enclosing generic package, which is semantically
832 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
);
833 -- Analyze actuals to perform name resolution. Full resolution is done
834 -- later, when the expected types are known, but names have to be captured
835 -- before installing parents of generics, that are not visible for the
836 -- actuals themselves.
838 -- If Inst is present, it is the entity of the package instance. This
839 -- entity is marked as having a limited_view actual when some actual is
840 -- a limited view. This is used to place the instance body properly.
842 procedure Provide_Completing_Bodies
(N
: Node_Id
);
843 -- Generate completing bodies for all subprograms found within package or
844 -- subprogram declaration N.
846 procedure Remove_Parent
(In_Body
: Boolean := False);
847 -- Reverse effect after instantiation of child is complete
849 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
850 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
853 procedure Set_Instance_Env
854 (Gen_Unit
: Entity_Id
;
855 Act_Unit
: Entity_Id
);
856 -- Save current instance on saved environment, to be used to determine
857 -- the global status of entities in nested instances. Part of Save_Env.
858 -- called after verifying that the generic unit is legal for the instance,
859 -- The procedure also examines whether the generic unit is a predefined
860 -- unit, in order to set configuration switches accordingly. As a result
861 -- the procedure must be called after analyzing and freezing the actuals.
863 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
864 -- Associate analyzed generic parameter with corresponding instance. Used
865 -- for semantic checks at instantiation time.
867 function True_Parent
(N
: Node_Id
) return Node_Id
;
868 -- For a subunit, return parent of corresponding stub, else return
871 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
872 -- Verify that an attribute that appears as the default for a formal
873 -- subprogram is a function or procedure with the correct profile.
875 -------------------------------------------
876 -- Data Structures for Generic Renamings --
877 -------------------------------------------
879 -- The map Generic_Renamings associates generic entities with their
880 -- corresponding actuals. Currently used to validate type instances. It
881 -- will eventually be used for all generic parameters to eliminate the
882 -- need for overload resolution in the instance.
884 type Assoc_Ptr
is new Int
;
886 Assoc_Null
: constant Assoc_Ptr
:= -1;
891 Next_In_HTable
: Assoc_Ptr
;
894 package Generic_Renamings
is new Table
.Table
895 (Table_Component_Type
=> Assoc
,
896 Table_Index_Type
=> Assoc_Ptr
,
897 Table_Low_Bound
=> 0,
899 Table_Increment
=> 100,
900 Table_Name
=> "Generic_Renamings");
902 -- Variable to hold enclosing instantiation. When the environment is
903 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
905 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
907 -- Hash table for associations
909 HTable_Size
: constant := 37;
910 type HTable_Range
is range 0 .. HTable_Size
- 1;
912 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
913 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
914 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
915 function Hash
(F
: Entity_Id
) return HTable_Range
;
917 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
918 Header_Num
=> HTable_Range
,
920 Elmt_Ptr
=> Assoc_Ptr
,
921 Null_Ptr
=> Assoc_Null
,
922 Set_Next
=> Set_Next_Assoc
,
925 Get_Key
=> Get_Gen_Id
,
929 Exchanged_Views
: Elist_Id
;
930 -- This list holds the private views that have been exchanged during
931 -- instantiation to restore the visibility of the generic declaration.
932 -- (see comments above). After instantiation, the current visibility is
933 -- reestablished by means of a traversal of this list.
935 Hidden_Entities
: Elist_Id
;
936 -- This list holds the entities of the current scope that are removed
937 -- from immediate visibility when instantiating a child unit. Their
938 -- visibility is restored in Remove_Parent.
940 -- Because instantiations can be recursive, the following must be saved
941 -- on entry and restored on exit from an instantiation (spec or body).
942 -- This is done by the two procedures Save_Env and Restore_Env. For
943 -- package and subprogram instantiations (but not for the body instances)
944 -- the action of Save_Env is done in two steps: Init_Env is called before
945 -- Check_Generic_Child_Unit, because setting the parent instances requires
946 -- that the visibility data structures be properly initialized. Once the
947 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
949 Parent_Unit_Visible
: Boolean := False;
950 -- Parent_Unit_Visible is used when the generic is a child unit, and
951 -- indicates whether the ultimate parent of the generic is visible in the
952 -- instantiation environment. It is used to reset the visibility of the
953 -- parent at the end of the instantiation (see Remove_Parent).
955 Instance_Parent_Unit
: Entity_Id
:= Empty
;
956 -- This records the ultimate parent unit of an instance of a generic
957 -- child unit and is used in conjunction with Parent_Unit_Visible to
958 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
960 type Instance_Env
is record
961 Instantiated_Parent
: Assoc
;
962 Exchanged_Views
: Elist_Id
;
963 Hidden_Entities
: Elist_Id
;
964 Current_Sem_Unit
: Unit_Number_Type
;
965 Parent_Unit_Visible
: Boolean := False;
966 Instance_Parent_Unit
: Entity_Id
:= Empty
;
967 Switches
: Config_Switches_Type
;
970 package Instance_Envs
is new Table
.Table
(
971 Table_Component_Type
=> Instance_Env
,
972 Table_Index_Type
=> Int
,
973 Table_Low_Bound
=> 0,
975 Table_Increment
=> 100,
976 Table_Name
=> "Instance_Envs");
978 procedure Restore_Private_Views
979 (Pack_Id
: Entity_Id
;
980 Is_Package
: Boolean := True);
981 -- Restore the private views of external types, and unmark the generic
982 -- renamings of actuals, so that they become compatible subtypes again.
983 -- For subprograms, Pack_Id is the package constructed to hold the
986 procedure Switch_View
(T
: Entity_Id
);
987 -- Switch the partial and full views of a type and its private
988 -- dependents (i.e. its subtypes and derived types).
990 ------------------------------------
991 -- Structures for Error Reporting --
992 ------------------------------------
994 Instantiation_Node
: Node_Id
;
995 -- Used by subprograms that validate instantiation of formal parameters
996 -- where there might be no actual on which to place the error message.
997 -- Also used to locate the instantiation node for generic subunits.
999 Instantiation_Error
: exception;
1000 -- When there is a semantic error in the generic parameter matching,
1001 -- there is no point in continuing the instantiation, because the
1002 -- number of cascaded errors is unpredictable. This exception aborts
1003 -- the instantiation process altogether.
1005 S_Adjustment
: Sloc_Adjustment
;
1006 -- Offset created for each node in an instantiation, in order to keep
1007 -- track of the source position of the instantiation in each of its nodes.
1008 -- A subsequent semantic error or warning on a construct of the instance
1009 -- points to both places: the original generic node, and the point of
1010 -- instantiation. See Sinput and Sinput.L for additional details.
1012 ------------------------------------------------------------
1013 -- Data structure for keeping track when inside a Generic --
1014 ------------------------------------------------------------
1016 -- The following table is used to save values of the Inside_A_Generic
1017 -- flag (see spec of Sem) when they are saved by Start_Generic.
1019 package Generic_Flags
is new Table
.Table
(
1020 Table_Component_Type
=> Boolean,
1021 Table_Index_Type
=> Int
,
1022 Table_Low_Bound
=> 0,
1023 Table_Initial
=> 32,
1024 Table_Increment
=> 200,
1025 Table_Name
=> "Generic_Flags");
1027 ---------------------------
1028 -- Abandon_Instantiation --
1029 ---------------------------
1031 procedure Abandon_Instantiation
(N
: Node_Id
) is
1033 Error_Msg_N
("\instantiation abandoned!", N
);
1034 raise Instantiation_Error
;
1035 end Abandon_Instantiation
;
1037 --------------------------------
1038 -- Add_Pending_Instantiation --
1039 --------------------------------
1041 procedure Add_Pending_Instantiation
(Inst
: Node_Id
; Act_Decl
: Node_Id
) is
1044 -- Add to the instantiation node and the corresponding unit declaration
1045 -- the current values of global flags to be used when analyzing the
1048 Pending_Instantiations
.Append
1049 ((Inst_Node
=> Inst
,
1050 Act_Decl
=> Act_Decl
,
1051 Expander_Status
=> Expander_Active
,
1052 Current_Sem_Unit
=> Current_Sem_Unit
,
1053 Scope_Suppress
=> Scope_Suppress
,
1054 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
1055 Version
=> Ada_Version
,
1056 Version_Pragma
=> Ada_Version_Pragma
,
1057 Warnings
=> Save_Warnings
,
1058 SPARK_Mode
=> SPARK_Mode
,
1059 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
));
1060 end Add_Pending_Instantiation
;
1062 ----------------------------------
1063 -- Adjust_Inherited_Pragma_Sloc --
1064 ----------------------------------
1066 procedure Adjust_Inherited_Pragma_Sloc
(N
: Node_Id
) is
1068 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1069 end Adjust_Inherited_Pragma_Sloc
;
1071 --------------------------
1072 -- Analyze_Associations --
1073 --------------------------
1075 function Analyze_Associations
1078 F_Copy
: List_Id
) return List_Id
1080 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
1081 Assoc_List
: constant List_Id
:= New_List
;
1082 Default_Actuals
: constant List_Id
:= New_List
;
1083 Gen_Unit
: constant Entity_Id
:=
1084 Defining_Entity
(Parent
(F_Copy
));
1088 Analyzed_Formal
: Node_Id
;
1089 First_Named
: Node_Id
:= Empty
;
1093 Saved_Formal
: Node_Id
;
1095 Default_Formals
: constant List_Id
:= New_List
;
1096 -- If an Others_Choice is present, some of the formals may be defaulted.
1097 -- To simplify the treatment of visibility in an instance, we introduce
1098 -- individual defaults for each such formal. These defaults are
1099 -- appended to the list of associations and replace the Others_Choice.
1101 Found_Assoc
: Node_Id
;
1102 -- Association for the current formal being match. Empty if there are
1103 -- no remaining actuals, or if there is no named association with the
1104 -- name of the formal.
1106 Is_Named_Assoc
: Boolean;
1107 Num_Matched
: Nat
:= 0;
1108 Num_Actuals
: Nat
:= 0;
1110 Others_Present
: Boolean := False;
1111 Others_Choice
: Node_Id
:= Empty
;
1112 -- In Ada 2005, indicates partial parameterization of a formal
1113 -- package. As usual an other association must be last in the list.
1115 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
);
1116 -- Warn if an actual fixed-point type has user-defined arithmetic
1117 -- operations, but there is no corresponding formal in the generic,
1118 -- in which case the predefined operations will be used. This merits
1119 -- a warning because of the special semantics of fixed point ops.
1121 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
);
1122 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1123 -- cannot have a named association for it. AI05-0025 extends this rule
1124 -- to formals of formal packages by AI05-0025, and it also applies to
1125 -- box-initialized formals.
1127 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
1128 -- Determine whether the parameter types and the return type of Subp
1129 -- are fully defined at the point of instantiation.
1131 function Matching_Actual
1133 A_F
: Entity_Id
) return Node_Id
;
1134 -- Find actual that corresponds to a given a formal parameter. If the
1135 -- actuals are positional, return the next one, if any. If the actuals
1136 -- are named, scan the parameter associations to find the right one.
1137 -- A_F is the corresponding entity in the analyzed generic, which is
1138 -- placed on the selector name for ASIS use.
1140 -- In Ada 2005, a named association may be given with a box, in which
1141 -- case Matching_Actual sets Found_Assoc to the generic association,
1142 -- but return Empty for the actual itself. In this case the code below
1143 -- creates a corresponding declaration for the formal.
1145 function Partial_Parameterization
return Boolean;
1146 -- Ada 2005: if no match is found for a given formal, check if the
1147 -- association for it includes a box, or whether the associations
1148 -- include an Others clause.
1150 procedure Process_Default
(F
: Entity_Id
);
1151 -- Add a copy of the declaration of generic formal F to the list of
1152 -- associations, and add an explicit box association for F if there
1153 -- is none yet, and the default comes from an Others_Choice.
1155 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1156 -- Determine whether Subp renames one of the subprograms defined in the
1157 -- generated package Standard.
1159 procedure Set_Analyzed_Formal
;
1160 -- Find the node in the generic copy that corresponds to a given formal.
1161 -- The semantic information on this node is used to perform legality
1162 -- checks on the actuals. Because semantic analysis can introduce some
1163 -- anonymous entities or modify the declaration node itself, the
1164 -- correspondence between the two lists is not one-one. In addition to
1165 -- anonymous types, the presence a formal equality will introduce an
1166 -- implicit declaration for the corresponding inequality.
1168 ----------------------------------------
1169 -- Check_Overloaded_Formal_Subprogram --
1170 ----------------------------------------
1172 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
) is
1173 Temp_Formal
: Entity_Id
;
1176 Temp_Formal
:= First
(Formals
);
1177 while Present
(Temp_Formal
) loop
1178 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1179 and then Temp_Formal
/= Formal
1181 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1182 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1184 if Present
(Found_Assoc
) then
1186 ("named association not allowed for overloaded formal",
1191 ("named association not allowed for overloaded formal",
1195 Abandon_Instantiation
(Instantiation_Node
);
1200 end Check_Overloaded_Formal_Subprogram
;
1202 -------------------------------
1203 -- Check_Fixed_Point_Actual --
1204 -------------------------------
1206 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
) is
1207 Typ
: constant Entity_Id
:= Entity
(Actual
);
1208 Prims
: constant Elist_Id
:= Collect_Primitive_Operations
(Typ
);
1214 -- Locate primitive operations of the type that are arithmetic
1217 Elem
:= First_Elmt
(Prims
);
1218 while Present
(Elem
) loop
1219 if Nkind
(Node
(Elem
)) = N_Defining_Operator_Symbol
then
1221 -- Check whether the generic unit has a formal subprogram of
1222 -- the same name. This does not check types but is good enough
1223 -- to justify a warning.
1225 Formal
:= First_Non_Pragma
(Formals
);
1226 Op
:= Alias
(Node
(Elem
));
1228 while Present
(Formal
) loop
1229 if Nkind
(Formal
) = N_Formal_Concrete_Subprogram_Declaration
1230 and then Chars
(Defining_Entity
(Formal
)) =
1235 elsif Nkind
(Formal
) = N_Formal_Package_Declaration
then
1241 -- Locate corresponding actual, and check whether it
1242 -- includes a fixed-point type.
1244 Assoc
:= First
(Assoc_List
);
1245 while Present
(Assoc
) loop
1247 Nkind
(Assoc
) = N_Package_Renaming_Declaration
1248 and then Chars
(Defining_Unit_Name
(Assoc
)) =
1249 Chars
(Defining_Identifier
(Formal
));
1254 if Present
(Assoc
) then
1256 -- If formal package declares a fixed-point type,
1257 -- and the user-defined operator is derived from
1258 -- a generic instance package, the fixed-point type
1259 -- does not use the corresponding predefined op.
1261 Ent
:= First_Entity
(Entity
(Name
(Assoc
)));
1262 while Present
(Ent
) loop
1263 if Is_Fixed_Point_Type
(Ent
)
1264 and then Present
(Op
)
1265 and then Is_Generic_Instance
(Scope
(Op
))
1280 Error_Msg_Sloc
:= Sloc
(Node
(Elem
));
1282 ("?instance does not use primitive operation&#",
1283 Actual
, Node
(Elem
));
1289 end Check_Fixed_Point_Actual
;
1291 -------------------------------
1292 -- Has_Fully_Defined_Profile --
1293 -------------------------------
1295 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1296 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1297 -- Determine whethet type Typ is fully defined
1299 ---------------------------
1300 -- Is_Fully_Defined_Type --
1301 ---------------------------
1303 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1305 -- A private type without a full view is not fully defined
1307 if Is_Private_Type
(Typ
)
1308 and then No
(Full_View
(Typ
))
1312 -- An incomplete type is never fully defined
1314 elsif Is_Incomplete_Type
(Typ
) then
1317 -- All other types are fully defined
1322 end Is_Fully_Defined_Type
;
1324 -- Local declarations
1328 -- Start of processing for Has_Fully_Defined_Profile
1331 -- Check the parameters
1333 Param
:= First_Formal
(Subp
);
1334 while Present
(Param
) loop
1335 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1339 Next_Formal
(Param
);
1342 -- Check the return type
1344 return Is_Fully_Defined_Type
(Etype
(Subp
));
1345 end Has_Fully_Defined_Profile
;
1347 ---------------------
1348 -- Matching_Actual --
1349 ---------------------
1351 function Matching_Actual
1353 A_F
: Entity_Id
) return Node_Id
1359 Is_Named_Assoc
:= False;
1361 -- End of list of purely positional parameters
1363 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1364 Found_Assoc
:= Empty
;
1367 -- Case of positional parameter corresponding to current formal
1369 elsif No
(Selector_Name
(Actual
)) then
1370 Found_Assoc
:= Actual
;
1371 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1372 Num_Matched
:= Num_Matched
+ 1;
1375 -- Otherwise scan list of named actuals to find the one with the
1376 -- desired name. All remaining actuals have explicit names.
1379 Is_Named_Assoc
:= True;
1380 Found_Assoc
:= Empty
;
1384 while Present
(Actual
) loop
1385 if Nkind
(Actual
) = N_Others_Choice
then
1386 Found_Assoc
:= Empty
;
1389 elsif Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1390 Set_Entity
(Selector_Name
(Actual
), A_F
);
1391 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1392 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1394 Found_Assoc
:= Actual
;
1395 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1396 Num_Matched
:= Num_Matched
+ 1;
1404 -- Reset for subsequent searches. In most cases the named
1405 -- associations are in order. If they are not, we reorder them
1406 -- to avoid scanning twice the same actual. This is not just a
1407 -- question of efficiency: there may be multiple defaults with
1408 -- boxes that have the same name. In a nested instantiation we
1409 -- insert actuals for those defaults, and cannot rely on their
1410 -- names to disambiguate them.
1412 if Actual
= First_Named
then
1415 elsif Present
(Actual
) then
1416 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1419 Actual
:= First_Named
;
1422 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1423 Set_Used_As_Generic_Actual
(Entity
(Act
));
1427 end Matching_Actual
;
1429 ------------------------------
1430 -- Partial_Parameterization --
1431 ------------------------------
1433 function Partial_Parameterization
return Boolean is
1435 return Others_Present
1436 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1437 end Partial_Parameterization
;
1439 ---------------------
1440 -- Process_Default --
1441 ---------------------
1443 procedure Process_Default
(F
: Entity_Id
) is
1444 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1445 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1451 -- Append copy of formal declaration to associations, and create new
1452 -- defining identifier for it.
1454 Decl
:= New_Copy_Tree
(F
);
1455 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1457 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1458 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1461 Set_Defining_Identifier
(Decl
, Id
);
1464 Append
(Decl
, Assoc_List
);
1466 if No
(Found_Assoc
) then
1468 Make_Generic_Association
(Loc
,
1470 New_Occurrence_Of
(Id
, Loc
),
1471 Explicit_Generic_Actual_Parameter
=> Empty
);
1472 Set_Box_Present
(Default
);
1473 Append
(Default
, Default_Formals
);
1475 end Process_Default
;
1477 ---------------------------------
1478 -- Renames_Standard_Subprogram --
1479 ---------------------------------
1481 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1486 while Present
(Id
) loop
1487 if Scope
(Id
) = Standard_Standard
then
1495 end Renames_Standard_Subprogram
;
1497 -------------------------
1498 -- Set_Analyzed_Formal --
1499 -------------------------
1501 procedure Set_Analyzed_Formal
is
1505 while Present
(Analyzed_Formal
) loop
1506 Kind
:= Nkind
(Analyzed_Formal
);
1508 case Nkind
(Formal
) is
1509 when N_Formal_Subprogram_Declaration
=>
1510 exit when Kind
in N_Formal_Subprogram_Declaration
1513 (Defining_Unit_Name
(Specification
(Formal
))) =
1515 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1517 when N_Formal_Package_Declaration
=>
1518 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1519 N_Generic_Package_Declaration
,
1520 N_Package_Declaration
);
1522 when N_Use_Package_Clause
1529 -- Skip freeze nodes, and nodes inserted to replace
1530 -- unrecognized pragmas.
1533 Kind
not in N_Formal_Subprogram_Declaration
1534 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1538 and then Chars
(Defining_Identifier
(Formal
)) =
1539 Chars
(Defining_Identifier
(Analyzed_Formal
));
1542 Next
(Analyzed_Formal
);
1544 end Set_Analyzed_Formal
;
1546 -- Start of processing for Analyze_Associations
1549 Actuals
:= Generic_Associations
(I_Node
);
1551 if Present
(Actuals
) then
1553 -- Check for an Others choice, indicating a partial parameterization
1554 -- for a formal package.
1556 Actual
:= First
(Actuals
);
1557 while Present
(Actual
) loop
1558 if Nkind
(Actual
) = N_Others_Choice
then
1559 Others_Present
:= True;
1560 Others_Choice
:= Actual
;
1562 if Present
(Next
(Actual
)) then
1563 Error_Msg_N
("others must be last association", Actual
);
1566 -- This subprogram is used both for formal packages and for
1567 -- instantiations. For the latter, associations must all be
1570 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1571 and then Comes_From_Source
(I_Node
)
1574 ("others association not allowed in an instance",
1578 -- In any case, nothing to do after the others association
1582 elsif Box_Present
(Actual
)
1583 and then Comes_From_Source
(I_Node
)
1584 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1587 ("box association not allowed in an instance", Actual
);
1593 -- If named associations are present, save first named association
1594 -- (it may of course be Empty) to facilitate subsequent name search.
1596 First_Named
:= First
(Actuals
);
1597 while Present
(First_Named
)
1598 and then Nkind
(First_Named
) /= N_Others_Choice
1599 and then No
(Selector_Name
(First_Named
))
1601 Num_Actuals
:= Num_Actuals
+ 1;
1606 Named
:= First_Named
;
1607 while Present
(Named
) loop
1608 if Nkind
(Named
) /= N_Others_Choice
1609 and then No
(Selector_Name
(Named
))
1611 Error_Msg_N
("invalid positional actual after named one", Named
);
1612 Abandon_Instantiation
(Named
);
1615 -- A named association may lack an actual parameter, if it was
1616 -- introduced for a default subprogram that turns out to be local
1617 -- to the outer instantiation. If it has a box association it must
1618 -- correspond to some formal in the generic.
1620 if Nkind
(Named
) /= N_Others_Choice
1621 and then (Present
(Explicit_Generic_Actual_Parameter
(Named
))
1622 or else Box_Present
(Named
))
1624 Num_Actuals
:= Num_Actuals
+ 1;
1630 if Present
(Formals
) then
1631 Formal
:= First_Non_Pragma
(Formals
);
1632 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1634 if Present
(Actuals
) then
1635 Actual
:= First
(Actuals
);
1637 -- All formals should have default values
1643 while Present
(Formal
) loop
1644 Set_Analyzed_Formal
;
1645 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1647 case Nkind
(Formal
) is
1648 when N_Formal_Object_Declaration
=>
1651 (Defining_Identifier
(Formal
),
1652 Defining_Identifier
(Analyzed_Formal
));
1654 if No
(Match
) and then Partial_Parameterization
then
1655 Process_Default
(Formal
);
1659 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1662 -- For a defaulted in_parameter, create an entry in the
1663 -- the list of defaulted actuals, for GNATProve use. Do
1664 -- not included these defaults for an instance nested
1665 -- within a generic, because the defaults are also used
1666 -- in the analysis of the enclosing generic, and only
1667 -- defaulted subprograms are relevant there.
1669 if No
(Match
) and then not Inside_A_Generic
then
1670 Append_To
(Default_Actuals
,
1671 Make_Generic_Association
(Sloc
(I_Node
),
1674 (Defining_Identifier
(Formal
), Sloc
(I_Node
)),
1675 Explicit_Generic_Actual_Parameter
=>
1676 New_Copy_Tree
(Default_Expression
(Formal
))));
1680 -- If the object is a call to an expression function, this
1681 -- is a freezing point for it.
1683 if Is_Entity_Name
(Match
)
1684 and then Present
(Entity
(Match
))
1686 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1687 = N_Expression_Function
1689 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1692 when N_Formal_Type_Declaration
=>
1695 (Defining_Identifier
(Formal
),
1696 Defining_Identifier
(Analyzed_Formal
));
1699 if Partial_Parameterization
then
1700 Process_Default
(Formal
);
1703 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1706 Instantiation_Node
, Defining_Identifier
(Formal
));
1708 ("\in instantiation of & declared#",
1709 Instantiation_Node
, Gen_Unit
);
1710 Abandon_Instantiation
(Instantiation_Node
);
1717 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1720 if Is_Fixed_Point_Type
(Entity
(Match
)) then
1721 Check_Fixed_Point_Actual
(Match
);
1724 -- An instantiation is a freeze point for the actuals,
1725 -- unless this is a rewritten formal package, or the
1726 -- formal is an Ada 2012 formal incomplete type.
1728 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1730 (Ada_Version
>= Ada_2012
1732 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1738 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1742 -- A remote access-to-class-wide type is not a legal actual
1743 -- for a generic formal of an access type (E.2.2(17/2)).
1744 -- In GNAT an exception to this rule is introduced when
1745 -- the formal is marked as remote using implementation
1746 -- defined aspect/pragma Remote_Access_Type. In that case
1747 -- the actual must be remote as well.
1749 -- If the current instantiation is the construction of a
1750 -- local copy for a formal package the actuals may be
1751 -- defaulted, and there is no matching actual to check.
1753 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1755 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1756 N_Access_To_Object_Definition
1757 and then Present
(Match
)
1760 Formal_Ent
: constant Entity_Id
:=
1761 Defining_Identifier
(Analyzed_Formal
);
1763 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1764 = Is_Remote_Types
(Formal_Ent
)
1766 -- Remoteness of formal and actual match
1770 elsif Is_Remote_Types
(Formal_Ent
) then
1772 -- Remote formal, non-remote actual
1775 ("actual for& must be remote", Match
, Formal_Ent
);
1778 -- Non-remote formal, remote actual
1781 ("actual for& may not be remote",
1787 when N_Formal_Subprogram_Declaration
=>
1790 (Defining_Unit_Name
(Specification
(Formal
)),
1791 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1793 -- If the formal subprogram has the same name as another
1794 -- formal subprogram of the generic, then a named
1795 -- association is illegal (12.3(9)). Exclude named
1796 -- associations that are generated for a nested instance.
1799 and then Is_Named_Assoc
1800 and then Comes_From_Source
(Found_Assoc
)
1802 Check_Overloaded_Formal_Subprogram
(Formal
);
1805 -- If there is no corresponding actual, this may be case
1806 -- of partial parameterization, or else the formal has a
1807 -- default or a box.
1809 if No
(Match
) and then Partial_Parameterization
then
1810 Process_Default
(Formal
);
1812 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1813 Check_Overloaded_Formal_Subprogram
(Formal
);
1817 Append_To
(Assoc_List
,
1818 Instantiate_Formal_Subprogram
1819 (Formal
, Match
, Analyzed_Formal
));
1821 -- An instantiation is a freeze point for the actuals,
1822 -- unless this is a rewritten formal package.
1824 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1825 and then Nkind
(Match
) = N_Identifier
1826 and then Is_Subprogram
(Entity
(Match
))
1828 -- The actual subprogram may rename a routine defined
1829 -- in Standard. Avoid freezing such renamings because
1830 -- subprograms coming from Standard cannot be frozen.
1833 not Renames_Standard_Subprogram
(Entity
(Match
))
1835 -- If the actual subprogram comes from a different
1836 -- unit, it is already frozen, either by a body in
1837 -- that unit or by the end of the declarative part
1838 -- of the unit. This check avoids the freezing of
1839 -- subprograms defined in Standard which are used
1840 -- as generic actuals.
1842 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1843 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1845 -- Mark the subprogram as having a delayed freeze
1846 -- since this may be an out-of-order action.
1848 Set_Has_Delayed_Freeze
(Entity
(Match
));
1849 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1853 -- If this is a nested generic, preserve default for later
1854 -- instantiations. We do this as well for GNATProve use,
1855 -- so that the list of generic associations is complete.
1857 if No
(Match
) and then Box_Present
(Formal
) then
1859 Subp
: constant Entity_Id
:=
1861 (Specification
(Last
(Assoc_List
)));
1864 Append_To
(Default_Actuals
,
1865 Make_Generic_Association
(Sloc
(I_Node
),
1867 New_Occurrence_Of
(Subp
, Sloc
(I_Node
)),
1868 Explicit_Generic_Actual_Parameter
=>
1869 New_Occurrence_Of
(Subp
, Sloc
(I_Node
))));
1873 when N_Formal_Package_Declaration
=>
1876 (Defining_Identifier
(Formal
),
1877 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1880 if Partial_Parameterization
then
1881 Process_Default
(Formal
);
1884 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1887 Instantiation_Node
, Defining_Identifier
(Formal
));
1889 ("\in instantiation of & declared#",
1890 Instantiation_Node
, Gen_Unit
);
1892 Abandon_Instantiation
(Instantiation_Node
);
1898 (Instantiate_Formal_Package
1899 (Formal
, Match
, Analyzed_Formal
),
1902 -- Determine whether the actual package needs an explicit
1903 -- freeze node. This is only the case if the actual is
1904 -- declared in the same unit and has a body. Normally
1905 -- packages do not have explicit freeze nodes, and gigi
1906 -- only uses them to elaborate entities in a package
1909 Explicit_Freeze_Check
: declare
1910 Actual
: constant Entity_Id
:= Entity
(Match
);
1911 Gen_Par
: Entity_Id
;
1913 Needs_Freezing
: Boolean;
1916 procedure Check_Generic_Parent
;
1917 -- The actual may be an instantiation of a unit
1918 -- declared in a previous instantiation. If that
1919 -- one is also in the current compilation, it must
1920 -- itself be frozen before the actual. The actual
1921 -- may be an instantiation of a generic child unit,
1922 -- in which case the same applies to the instance
1923 -- of the parent which must be frozen before the
1925 -- Should this itself be recursive ???
1927 --------------------------
1928 -- Check_Generic_Parent --
1929 --------------------------
1931 procedure Check_Generic_Parent
is
1932 Inst
: constant Node_Id
:=
1933 Next
(Unit_Declaration_Node
(Actual
));
1939 if Nkind
(Parent
(Actual
)) = N_Package_Specification
1941 Par
:= Scope
(Generic_Parent
(Parent
(Actual
)));
1943 if Is_Generic_Instance
(Par
) then
1946 -- If the actual is a child generic unit, check
1947 -- whether the instantiation of the parent is
1948 -- also local and must also be frozen now. We
1949 -- must retrieve the instance node to locate the
1950 -- parent instance if any.
1952 elsif Ekind
(Par
) = E_Generic_Package
1953 and then Is_Child_Unit
(Gen_Par
)
1954 and then Ekind
(Scope
(Gen_Par
)) =
1957 if Nkind
(Inst
) = N_Package_Instantiation
1958 and then Nkind
(Name
(Inst
)) =
1961 -- Retrieve entity of parent instance
1963 Par
:= Entity
(Prefix
(Name
(Inst
)));
1972 and then Is_Generic_Instance
(Par
)
1973 and then Scope
(Par
) = Current_Scope
1975 (No
(Freeze_Node
(Par
))
1977 not Is_List_Member
(Freeze_Node
(Par
)))
1979 Set_Has_Delayed_Freeze
(Par
);
1980 Append_Elmt
(Par
, Actuals_To_Freeze
);
1982 end Check_Generic_Parent
;
1984 -- Start of processing for Explicit_Freeze_Check
1987 if Present
(Renamed_Entity
(Actual
)) then
1989 Generic_Parent
(Specification
1990 (Unit_Declaration_Node
1991 (Renamed_Entity
(Actual
))));
1994 Generic_Parent
(Specification
1995 (Unit_Declaration_Node
(Actual
)));
1998 if not Expander_Active
1999 or else not Has_Completion
(Actual
)
2000 or else not In_Same_Source_Unit
(I_Node
, Actual
)
2001 or else Is_Frozen
(Actual
)
2003 (Present
(Renamed_Entity
(Actual
))
2005 not In_Same_Source_Unit
2006 (I_Node
, (Renamed_Entity
(Actual
))))
2011 -- Finally we want to exclude such freeze nodes
2012 -- from statement sequences, which freeze
2013 -- everything before them.
2014 -- Is this strictly necessary ???
2016 Needs_Freezing
:= True;
2019 while Present
(S
) loop
2020 if Ekind_In
(S
, E_Block
,
2025 Needs_Freezing
:= False;
2032 if Needs_Freezing
then
2033 Check_Generic_Parent
;
2035 -- If the actual is a renaming of a proper
2036 -- instance of the formal package, indicate
2037 -- that it is the instance that must be frozen.
2039 if Nkind
(Parent
(Actual
)) =
2040 N_Package_Renaming_Declaration
2042 Set_Has_Delayed_Freeze
2043 (Renamed_Entity
(Actual
));
2045 (Renamed_Entity
(Actual
),
2048 Set_Has_Delayed_Freeze
(Actual
);
2049 Append_Elmt
(Actual
, Actuals_To_Freeze
);
2053 end Explicit_Freeze_Check
;
2056 -- For use type and use package appearing in the generic part,
2057 -- we have already copied them, so we can just move them where
2058 -- they belong (we mustn't recopy them since this would mess up
2059 -- the Sloc values).
2061 when N_Use_Package_Clause
2064 if Nkind
(Original_Node
(I_Node
)) =
2065 N_Formal_Package_Declaration
2067 Append
(New_Copy_Tree
(Formal
), Assoc_List
);
2070 Append
(Formal
, Assoc_List
);
2074 raise Program_Error
;
2077 Formal
:= Saved_Formal
;
2078 Next_Non_Pragma
(Analyzed_Formal
);
2081 if Num_Actuals
> Num_Matched
then
2082 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2084 if Present
(Selector_Name
(Actual
)) then
2086 ("unmatched actual &", Actual
, Selector_Name
(Actual
));
2088 ("\in instantiation of & declared#", Actual
, Gen_Unit
);
2091 ("unmatched actual in instantiation of & declared#",
2096 elsif Present
(Actuals
) then
2098 ("too many actuals in generic instantiation", Instantiation_Node
);
2101 -- An instantiation freezes all generic actuals. The only exceptions
2102 -- to this are incomplete types and subprograms which are not fully
2103 -- defined at the point of instantiation.
2106 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
2108 while Present
(Elmt
) loop
2109 Freeze_Before
(I_Node
, Node
(Elmt
));
2114 -- If there are default subprograms, normalize the tree by adding
2115 -- explicit associations for them. This is required if the instance
2116 -- appears within a generic.
2118 if not Is_Empty_List
(Default_Actuals
) then
2123 Default
:= First
(Default_Actuals
);
2124 while Present
(Default
) loop
2125 Mark_Rewrite_Insertion
(Default
);
2129 if No
(Actuals
) then
2130 Set_Generic_Associations
(I_Node
, Default_Actuals
);
2132 Append_List_To
(Actuals
, Default_Actuals
);
2137 -- If this is a formal package, normalize the parameter list by adding
2138 -- explicit box associations for the formals that are covered by an
2141 if not Is_Empty_List
(Default_Formals
) then
2142 Append_List
(Default_Formals
, Formals
);
2146 end Analyze_Associations
;
2148 -------------------------------
2149 -- Analyze_Formal_Array_Type --
2150 -------------------------------
2152 procedure Analyze_Formal_Array_Type
2153 (T
: in out Entity_Id
;
2159 -- Treated like a non-generic array declaration, with additional
2164 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2165 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2166 while Present
(DSS
) loop
2167 if Nkind_In
(DSS
, N_Subtype_Indication
,
2169 N_Attribute_Reference
)
2171 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2178 Array_Type_Declaration
(T
, Def
);
2179 Set_Is_Generic_Type
(Base_Type
(T
));
2181 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2182 and then No
(Full_View
(Component_Type
(T
)))
2184 Error_Msg_N
("premature usage of incomplete type", Def
);
2186 -- Check that range constraint is not allowed on the component type
2187 -- of a generic formal array type (AARM 12.5.3(3))
2189 elsif Is_Internal
(Component_Type
(T
))
2190 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2191 and then Nkind
(Original_Node
2192 (Subtype_Indication
(Component_Definition
(Def
)))) =
2193 N_Subtype_Indication
2196 ("in a formal, a subtype indication can only be "
2197 & "a subtype mark (RM 12.5.3(3))",
2198 Subtype_Indication
(Component_Definition
(Def
)));
2201 end Analyze_Formal_Array_Type
;
2203 ---------------------------------------------
2204 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2205 ---------------------------------------------
2207 -- As for other generic types, we create a valid type representation with
2208 -- legal but arbitrary attributes, whose values are never considered
2209 -- static. For all scalar types we introduce an anonymous base type, with
2210 -- the same attributes. We choose the corresponding integer type to be
2211 -- Standard_Integer.
2212 -- Here and in other similar routines, the Sloc of the generated internal
2213 -- type must be the same as the sloc of the defining identifier of the
2214 -- formal type declaration, to provide proper source navigation.
2216 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2220 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2222 Base
: constant Entity_Id
:=
2224 (E_Decimal_Fixed_Point_Type
,
2226 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2228 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2229 Delta_Val
: constant Ureal
:= Ureal_1
;
2230 Digs_Val
: constant Uint
:= Uint_6
;
2232 function Make_Dummy_Bound
return Node_Id
;
2233 -- Return a properly typed universal real literal to use as a bound
2235 ----------------------
2236 -- Make_Dummy_Bound --
2237 ----------------------
2239 function Make_Dummy_Bound
return Node_Id
is
2240 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2242 Set_Etype
(Bound
, Universal_Real
);
2244 end Make_Dummy_Bound
;
2246 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2251 Set_Etype
(Base
, Base
);
2252 Set_Size_Info
(Base
, Int_Base
);
2253 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2254 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2255 Set_Digits_Value
(Base
, Digs_Val
);
2256 Set_Delta_Value
(Base
, Delta_Val
);
2257 Set_Small_Value
(Base
, Delta_Val
);
2258 Set_Scalar_Range
(Base
,
2260 Low_Bound
=> Make_Dummy_Bound
,
2261 High_Bound
=> Make_Dummy_Bound
));
2263 Set_Is_Generic_Type
(Base
);
2264 Set_Parent
(Base
, Parent
(Def
));
2266 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2267 Set_Etype
(T
, Base
);
2268 Set_Size_Info
(T
, Int_Base
);
2269 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2270 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2271 Set_Digits_Value
(T
, Digs_Val
);
2272 Set_Delta_Value
(T
, Delta_Val
);
2273 Set_Small_Value
(T
, Delta_Val
);
2274 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2275 Set_Is_Constrained
(T
);
2277 Check_Restriction
(No_Fixed_Point
, Def
);
2278 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2280 -------------------------------------------
2281 -- Analyze_Formal_Derived_Interface_Type --
2282 -------------------------------------------
2284 procedure Analyze_Formal_Derived_Interface_Type
2289 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2292 -- Rewrite as a type declaration of a derived type. This ensures that
2293 -- the interface list and primitive operations are properly captured.
2296 Make_Full_Type_Declaration
(Loc
,
2297 Defining_Identifier
=> T
,
2298 Type_Definition
=> Def
));
2300 Set_Is_Generic_Type
(T
);
2301 end Analyze_Formal_Derived_Interface_Type
;
2303 ---------------------------------
2304 -- Analyze_Formal_Derived_Type --
2305 ---------------------------------
2307 procedure Analyze_Formal_Derived_Type
2312 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2313 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2317 Set_Is_Generic_Type
(T
);
2319 if Private_Present
(Def
) then
2321 Make_Private_Extension_Declaration
(Loc
,
2322 Defining_Identifier
=> T
,
2323 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2324 Unknown_Discriminants_Present
=> Unk_Disc
,
2325 Subtype_Indication
=> Subtype_Mark
(Def
),
2326 Interface_List
=> Interface_List
(Def
));
2328 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2329 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2330 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2334 Make_Full_Type_Declaration
(Loc
,
2335 Defining_Identifier
=> T
,
2336 Discriminant_Specifications
=>
2337 Discriminant_Specifications
(Parent
(T
)),
2339 Make_Derived_Type_Definition
(Loc
,
2340 Subtype_Indication
=> Subtype_Mark
(Def
)));
2342 Set_Abstract_Present
2343 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2345 (Type_Definition
(New_N
), Limited_Present
(Def
));
2352 if not Is_Composite_Type
(T
) then
2354 ("unknown discriminants not allowed for elementary types", N
);
2356 Set_Has_Unknown_Discriminants
(T
);
2357 Set_Is_Constrained
(T
, False);
2361 -- If the parent type has a known size, so does the formal, which makes
2362 -- legal representation clauses that involve the formal.
2364 Set_Size_Known_At_Compile_Time
2365 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2366 end Analyze_Formal_Derived_Type
;
2368 ----------------------------------
2369 -- Analyze_Formal_Discrete_Type --
2370 ----------------------------------
2372 -- The operations defined for a discrete types are those of an enumeration
2373 -- type. The size is set to an arbitrary value, for use in analyzing the
2376 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2377 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2381 Base
: constant Entity_Id
:=
2383 (E_Floating_Point_Type
, Current_Scope
,
2384 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2388 Set_Ekind
(T
, E_Enumeration_Subtype
);
2389 Set_Etype
(T
, Base
);
2392 Set_Is_Generic_Type
(T
);
2393 Set_Is_Constrained
(T
);
2395 -- For semantic analysis, the bounds of the type must be set to some
2396 -- non-static value. The simplest is to create attribute nodes for those
2397 -- bounds, that refer to the type itself. These bounds are never
2398 -- analyzed but serve as place-holders.
2401 Make_Attribute_Reference
(Loc
,
2402 Attribute_Name
=> Name_First
,
2403 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2407 Make_Attribute_Reference
(Loc
,
2408 Attribute_Name
=> Name_Last
,
2409 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2412 Set_Scalar_Range
(T
,
2417 Set_Ekind
(Base
, E_Enumeration_Type
);
2418 Set_Etype
(Base
, Base
);
2419 Init_Size
(Base
, 8);
2420 Init_Alignment
(Base
);
2421 Set_Is_Generic_Type
(Base
);
2422 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2423 Set_Parent
(Base
, Parent
(Def
));
2424 end Analyze_Formal_Discrete_Type
;
2426 ----------------------------------
2427 -- Analyze_Formal_Floating_Type --
2428 ---------------------------------
2430 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2431 Base
: constant Entity_Id
:=
2433 (E_Floating_Point_Type
, Current_Scope
,
2434 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2437 -- The various semantic attributes are taken from the predefined type
2438 -- Float, just so that all of them are initialized. Their values are
2439 -- never used because no constant folding or expansion takes place in
2440 -- the generic itself.
2443 Set_Ekind
(T
, E_Floating_Point_Subtype
);
2444 Set_Etype
(T
, Base
);
2445 Set_Size_Info
(T
, (Standard_Float
));
2446 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2447 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2448 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2449 Set_Is_Constrained
(T
);
2451 Set_Is_Generic_Type
(Base
);
2452 Set_Etype
(Base
, Base
);
2453 Set_Size_Info
(Base
, (Standard_Float
));
2454 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2455 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2456 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2457 Set_Parent
(Base
, Parent
(Def
));
2459 Check_Restriction
(No_Floating_Point
, Def
);
2460 end Analyze_Formal_Floating_Type
;
2462 -----------------------------------
2463 -- Analyze_Formal_Interface_Type;--
2464 -----------------------------------
2466 procedure Analyze_Formal_Interface_Type
2471 Loc
: constant Source_Ptr
:= Sloc
(N
);
2476 Make_Full_Type_Declaration
(Loc
,
2477 Defining_Identifier
=> T
,
2478 Type_Definition
=> Def
);
2482 Set_Is_Generic_Type
(T
);
2483 end Analyze_Formal_Interface_Type
;
2485 ---------------------------------
2486 -- Analyze_Formal_Modular_Type --
2487 ---------------------------------
2489 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2491 -- Apart from their entity kind, generic modular types are treated like
2492 -- signed integer types, and have the same attributes.
2494 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2495 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
2496 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2498 end Analyze_Formal_Modular_Type
;
2500 ---------------------------------------
2501 -- Analyze_Formal_Object_Declaration --
2502 ---------------------------------------
2504 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2505 E
: constant Node_Id
:= Default_Expression
(N
);
2506 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2513 -- Determine the mode of the formal object
2515 if Out_Present
(N
) then
2516 K
:= E_Generic_In_Out_Parameter
;
2518 if not In_Present
(N
) then
2519 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2523 K
:= E_Generic_In_Parameter
;
2526 if Present
(Subtype_Mark
(N
)) then
2527 Find_Type
(Subtype_Mark
(N
));
2528 T
:= Entity
(Subtype_Mark
(N
));
2530 -- Verify that there is no redundant null exclusion
2532 if Null_Exclusion_Present
(N
) then
2533 if not Is_Access_Type
(T
) then
2535 ("null exclusion can only apply to an access type", N
);
2537 elsif Can_Never_Be_Null
(T
) then
2539 ("`NOT NULL` not allowed (& already excludes null)", N
, T
);
2543 -- Ada 2005 (AI-423): Formal object with an access definition
2546 Check_Access_Definition
(N
);
2547 T
:= Access_Definition
2549 N
=> Access_Definition
(N
));
2552 if Ekind
(T
) = E_Incomplete_Type
then
2554 Error_Node
: Node_Id
;
2557 if Present
(Subtype_Mark
(N
)) then
2558 Error_Node
:= Subtype_Mark
(N
);
2560 Check_Access_Definition
(N
);
2561 Error_Node
:= Access_Definition
(N
);
2564 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2568 if K
= E_Generic_In_Parameter
then
2570 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2572 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2574 ("generic formal of mode IN must not be of limited type", N
);
2575 Explain_Limited_Type
(T
, N
);
2578 if Is_Abstract_Type
(T
) then
2580 ("generic formal of mode IN must not be of abstract type", N
);
2584 Preanalyze_Spec_Expression
(E
, T
);
2586 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2588 ("initialization not allowed for limited types", E
);
2589 Explain_Limited_Type
(T
, E
);
2596 -- Case of generic IN OUT parameter
2599 -- If the formal has an unconstrained type, construct its actual
2600 -- subtype, as is done for subprogram formals. In this fashion, all
2601 -- its uses can refer to specific bounds.
2606 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2607 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2610 Non_Freezing_Ref
: constant Node_Id
:=
2611 New_Occurrence_Of
(Id
, Sloc
(Id
));
2615 -- Make sure the actual subtype doesn't generate bogus freezing
2617 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2618 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2619 Insert_Before_And_Analyze
(N
, Decl
);
2620 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2623 Set_Actual_Subtype
(Id
, T
);
2628 ("initialization not allowed for `IN OUT` formals", N
);
2632 if Has_Aspects
(N
) then
2633 Analyze_Aspect_Specifications
(N
, Id
);
2635 end Analyze_Formal_Object_Declaration
;
2637 ----------------------------------------------
2638 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2639 ----------------------------------------------
2641 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2645 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2646 Base
: constant Entity_Id
:=
2648 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2649 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2652 -- The semantic attributes are set for completeness only, their values
2653 -- will never be used, since all properties of the type are non-static.
2656 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2657 Set_Etype
(T
, Base
);
2658 Set_Size_Info
(T
, Standard_Integer
);
2659 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2660 Set_Small_Value
(T
, Ureal_1
);
2661 Set_Delta_Value
(T
, Ureal_1
);
2662 Set_Scalar_Range
(T
,
2664 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2665 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2666 Set_Is_Constrained
(T
);
2668 Set_Is_Generic_Type
(Base
);
2669 Set_Etype
(Base
, Base
);
2670 Set_Size_Info
(Base
, Standard_Integer
);
2671 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2672 Set_Small_Value
(Base
, Ureal_1
);
2673 Set_Delta_Value
(Base
, Ureal_1
);
2674 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2675 Set_Parent
(Base
, Parent
(Def
));
2677 Check_Restriction
(No_Fixed_Point
, Def
);
2678 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2680 ----------------------------------------
2681 -- Analyze_Formal_Package_Declaration --
2682 ----------------------------------------
2684 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2685 Gen_Id
: constant Node_Id
:= Name
(N
);
2686 Loc
: constant Source_Ptr
:= Sloc
(N
);
2687 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2690 Gen_Unit
: Entity_Id
;
2693 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2694 -- List of primitives made temporarily visible in the instantiation
2695 -- to match the visibility of the formal type.
2697 function Build_Local_Package
return Node_Id
;
2698 -- The formal package is rewritten so that its parameters are replaced
2699 -- with corresponding declarations. For parameters with bona fide
2700 -- associations these declarations are created by Analyze_Associations
2701 -- as for a regular instantiation. For boxed parameters, we preserve
2702 -- the formal declarations and analyze them, in order to introduce
2703 -- entities of the right kind in the environment of the formal.
2705 -------------------------
2706 -- Build_Local_Package --
2707 -------------------------
2709 function Build_Local_Package
return Node_Id
is
2711 Pack_Decl
: Node_Id
;
2714 -- Within the formal, the name of the generic package is a renaming
2715 -- of the formal (as for a regular instantiation).
2718 Make_Package_Declaration
(Loc
,
2721 (Specification
(Original_Node
(Gen_Decl
)),
2722 Empty
, Instantiating
=> True));
2725 Make_Package_Renaming_Declaration
(Loc
,
2726 Defining_Unit_Name
=>
2727 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2728 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2730 if Nkind
(Gen_Id
) = N_Identifier
2731 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2734 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2737 -- If the formal is declared with a box, or with an others choice,
2738 -- create corresponding declarations for all entities in the formal
2739 -- part, so that names with the proper types are available in the
2740 -- specification of the formal package.
2742 -- On the other hand, if there are no associations, then all the
2743 -- formals must have defaults, and this will be checked by the
2744 -- call to Analyze_Associations.
2747 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2750 Formal_Decl
: Node_Id
;
2753 -- TBA : for a formal package, need to recurse ???
2758 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2759 while Present
(Formal_Decl
) loop
2763 (Formal_Decl
, Empty
, Instantiating
=> True));
2768 -- If generic associations are present, use Analyze_Associations to
2769 -- create the proper renaming declarations.
2773 Act_Tree
: constant Node_Id
:=
2775 (Original_Node
(Gen_Decl
), Empty
,
2776 Instantiating
=> True);
2779 Generic_Renamings
.Set_Last
(0);
2780 Generic_Renamings_HTable
.Reset
;
2781 Instantiation_Node
:= N
;
2784 Analyze_Associations
2785 (I_Node
=> Original_Node
(N
),
2786 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2787 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2789 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2793 Append
(Renaming
, To
=> Decls
);
2795 -- Add generated declarations ahead of local declarations in
2798 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2799 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2802 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2807 end Build_Local_Package
;
2811 Save_ISMP
: constant Boolean := Ignore_SPARK_Mode_Pragmas_In_Instance
;
2812 -- Save flag Ignore_SPARK_Mode_Pragmas_In_Instance for restore on exit
2814 Associations
: Boolean := True;
2816 Parent_Installed
: Boolean := False;
2817 Parent_Instance
: Entity_Id
;
2818 Renaming_In_Par
: Entity_Id
;
2820 -- Start of processing for Analyze_Formal_Package_Declaration
2823 Check_Text_IO_Special_Unit
(Gen_Id
);
2826 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2827 Gen_Unit
:= Entity
(Gen_Id
);
2829 -- Check for a formal package that is a package renaming
2831 if Present
(Renamed_Object
(Gen_Unit
)) then
2833 -- Indicate that unit is used, before replacing it with renamed
2834 -- entity for use below.
2836 if In_Extended_Main_Source_Unit
(N
) then
2837 Set_Is_Instantiated
(Gen_Unit
);
2838 Generate_Reference
(Gen_Unit
, N
);
2841 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2844 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2845 Error_Msg_N
("expect generic package name", Gen_Id
);
2849 elsif Gen_Unit
= Current_Scope
then
2851 ("generic package cannot be used as a formal package of itself",
2856 elsif In_Open_Scopes
(Gen_Unit
) then
2857 if Is_Compilation_Unit
(Gen_Unit
)
2858 and then Is_Child_Unit
(Current_Scope
)
2860 -- Special-case the error when the formal is a parent, and
2861 -- continue analysis to minimize cascaded errors.
2864 ("generic parent cannot be used as formal package of a child "
2869 ("generic package cannot be used as a formal package within "
2870 & "itself", Gen_Id
);
2876 -- Check that name of formal package does not hide name of generic,
2877 -- or its leading prefix. This check must be done separately because
2878 -- the name of the generic has already been analyzed.
2881 Gen_Name
: Entity_Id
;
2885 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
2886 Gen_Name
:= Prefix
(Gen_Name
);
2889 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
2891 ("& is hidden within declaration of formal package",
2897 or else No
(Generic_Associations
(N
))
2898 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2900 Associations
:= False;
2903 -- If there are no generic associations, the generic parameters appear
2904 -- as local entities and are instantiated like them. We copy the generic
2905 -- package declaration as if it were an instantiation, and analyze it
2906 -- like a regular package, except that we treat the formals as
2907 -- additional visible components.
2909 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2911 if In_Extended_Main_Source_Unit
(N
) then
2912 Set_Is_Instantiated
(Gen_Unit
);
2913 Generate_Reference
(Gen_Unit
, N
);
2916 Formal
:= New_Copy
(Pack_Id
);
2917 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
2919 -- Make local generic without formals. The formals will be replaced with
2920 -- internal declarations.
2923 New_N
:= Build_Local_Package
;
2925 -- If there are errors in the parameter list, Analyze_Associations
2926 -- raises Instantiation_Error. Patch the declaration to prevent further
2927 -- exception propagation.
2930 when Instantiation_Error
=>
2931 Enter_Name
(Formal
);
2932 Set_Ekind
(Formal
, E_Variable
);
2933 Set_Etype
(Formal
, Any_Type
);
2934 Restore_Hidden_Primitives
(Vis_Prims_List
);
2936 if Parent_Installed
then
2944 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2945 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2946 Set_Instance_Env
(Gen_Unit
, Formal
);
2947 Set_Is_Generic_Instance
(Formal
);
2949 Enter_Name
(Formal
);
2950 Set_Ekind
(Formal
, E_Package
);
2951 Set_Etype
(Formal
, Standard_Void_Type
);
2952 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2953 Push_Scope
(Formal
);
2955 -- Manually set the SPARK_Mode from the context because the package
2956 -- declaration is never analyzed.
2958 Set_SPARK_Pragma
(Formal
, SPARK_Mode_Pragma
);
2959 Set_SPARK_Aux_Pragma
(Formal
, SPARK_Mode_Pragma
);
2960 Set_SPARK_Pragma_Inherited
(Formal
);
2961 Set_SPARK_Aux_Pragma_Inherited
(Formal
);
2963 if Is_Child_Unit
(Gen_Unit
) and then Parent_Installed
then
2965 -- Similarly, we have to make the name of the formal visible in the
2966 -- parent instance, to resolve properly fully qualified names that
2967 -- may appear in the generic unit. The parent instance has been
2968 -- placed on the scope stack ahead of the current scope.
2970 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2973 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2974 Set_Ekind
(Renaming_In_Par
, E_Package
);
2975 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2976 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2977 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2978 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2979 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2982 -- A formal package declaration behaves as a package instantiation with
2983 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
2984 -- missing, set the global flag which signals Analyze_Pragma to ingnore
2985 -- all SPARK_Mode pragmas within the generic_package_name.
2987 if SPARK_Mode
/= On
then
2988 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
2990 -- Mark the formal spec in case the body is instantiated at a later
2991 -- pass. This preserves the original context in effect for the body.
2993 Set_Ignore_SPARK_Mode_Pragmas
(Formal
);
2996 Analyze
(Specification
(N
));
2998 -- The formals for which associations are provided are not visible
2999 -- outside of the formal package. The others are still declared by a
3000 -- formal parameter declaration.
3002 -- If there are no associations, the only local entity to hide is the
3003 -- generated package renaming itself.
3009 E
:= First_Entity
(Formal
);
3010 while Present
(E
) loop
3011 if Associations
and then not Is_Generic_Formal
(E
) then
3015 if Ekind
(E
) = E_Package
and then Renamed_Entity
(E
) = Formal
then
3024 End_Package_Scope
(Formal
);
3025 Restore_Hidden_Primitives
(Vis_Prims_List
);
3027 if Parent_Installed
then
3033 -- Inside the generic unit, the formal package is a regular package, but
3034 -- no body is needed for it. Note that after instantiation, the defining
3035 -- unit name we need is in the new tree and not in the original (see
3036 -- Package_Instantiation). A generic formal package is an instance, and
3037 -- can be used as an actual for an inner instance.
3039 Set_Has_Completion
(Formal
, True);
3041 -- Add semantic information to the original defining identifier for ASIS
3044 Set_Ekind
(Pack_Id
, E_Package
);
3045 Set_Etype
(Pack_Id
, Standard_Void_Type
);
3046 Set_Scope
(Pack_Id
, Scope
(Formal
));
3047 Set_Has_Completion
(Pack_Id
, True);
3050 if Has_Aspects
(N
) then
3051 Analyze_Aspect_Specifications
(N
, Pack_Id
);
3054 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Save_ISMP
;
3055 end Analyze_Formal_Package_Declaration
;
3057 ---------------------------------
3058 -- Analyze_Formal_Private_Type --
3059 ---------------------------------
3061 procedure Analyze_Formal_Private_Type
3067 New_Private_Type
(N
, T
, Def
);
3069 -- Set the size to an arbitrary but legal value
3071 Set_Size_Info
(T
, Standard_Integer
);
3072 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3073 end Analyze_Formal_Private_Type
;
3075 ------------------------------------
3076 -- Analyze_Formal_Incomplete_Type --
3077 ------------------------------------
3079 procedure Analyze_Formal_Incomplete_Type
3085 Set_Ekind
(T
, E_Incomplete_Type
);
3087 Set_Private_Dependents
(T
, New_Elmt_List
);
3089 if Tagged_Present
(Def
) then
3090 Set_Is_Tagged_Type
(T
);
3091 Make_Class_Wide_Type
(T
);
3092 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
3094 end Analyze_Formal_Incomplete_Type
;
3096 ----------------------------------------
3097 -- Analyze_Formal_Signed_Integer_Type --
3098 ----------------------------------------
3100 procedure Analyze_Formal_Signed_Integer_Type
3104 Base
: constant Entity_Id
:=
3106 (E_Signed_Integer_Type
,
3108 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
3113 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
3114 Set_Etype
(T
, Base
);
3115 Set_Size_Info
(T
, Standard_Integer
);
3116 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3117 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
3118 Set_Is_Constrained
(T
);
3120 Set_Is_Generic_Type
(Base
);
3121 Set_Size_Info
(Base
, Standard_Integer
);
3122 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
3123 Set_Etype
(Base
, Base
);
3124 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
3125 Set_Parent
(Base
, Parent
(Def
));
3126 end Analyze_Formal_Signed_Integer_Type
;
3128 -------------------------------------------
3129 -- Analyze_Formal_Subprogram_Declaration --
3130 -------------------------------------------
3132 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
3133 Spec
: constant Node_Id
:= Specification
(N
);
3134 Def
: constant Node_Id
:= Default_Name
(N
);
3135 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
3143 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
3144 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3148 Analyze_Subprogram_Declaration
(N
);
3149 Set_Is_Formal_Subprogram
(Nam
);
3150 Set_Has_Completion
(Nam
);
3152 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3153 Set_Is_Abstract_Subprogram
(Nam
);
3155 Set_Is_Dispatching_Operation
(Nam
);
3157 -- A formal abstract procedure cannot have a null default
3158 -- (RM 12.6(4.1/2)).
3160 if Nkind
(Spec
) = N_Procedure_Specification
3161 and then Null_Present
(Spec
)
3164 ("a formal abstract subprogram cannot default to null", Spec
);
3168 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3170 if No
(Ctrl_Type
) then
3172 ("abstract formal subprogram must have a controlling type",
3175 elsif Ada_Version
>= Ada_2012
3176 and then Is_Incomplete_Type
(Ctrl_Type
)
3179 ("controlling type of abstract formal subprogram cannot "
3180 & "be incomplete type", N
, Ctrl_Type
);
3183 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3188 -- Default name is resolved at the point of instantiation
3190 if Box_Present
(N
) then
3193 -- Else default is bound at the point of generic declaration
3195 elsif Present
(Def
) then
3196 if Nkind
(Def
) = N_Operator_Symbol
then
3197 Find_Direct_Name
(Def
);
3199 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3203 -- For an attribute reference, analyze the prefix and verify
3204 -- that it has the proper profile for the subprogram.
3206 Analyze
(Prefix
(Def
));
3207 Valid_Default_Attribute
(Nam
, Def
);
3211 -- Default name may be overloaded, in which case the interpretation
3212 -- with the correct profile must be selected, as for a renaming.
3213 -- If the definition is an indexed component, it must denote a
3214 -- member of an entry family. If it is a selected component, it
3215 -- can be a protected operation.
3217 if Etype
(Def
) = Any_Type
then
3220 elsif Nkind
(Def
) = N_Selected_Component
then
3221 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3222 Error_Msg_N
("expect valid subprogram name as default", Def
);
3225 elsif Nkind
(Def
) = N_Indexed_Component
then
3226 if Is_Entity_Name
(Prefix
(Def
)) then
3227 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3228 Error_Msg_N
("expect valid subprogram name as default", Def
);
3231 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3232 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3235 Error_Msg_N
("expect valid subprogram name as default", Def
);
3239 Error_Msg_N
("expect valid subprogram name as default", Def
);
3243 elsif Nkind
(Def
) = N_Character_Literal
then
3245 -- Needs some type checks: subprogram should be parameterless???
3247 Resolve
(Def
, (Etype
(Nam
)));
3249 elsif not Is_Entity_Name
(Def
)
3250 or else not Is_Overloadable
(Entity
(Def
))
3252 Error_Msg_N
("expect valid subprogram name as default", Def
);
3255 elsif not Is_Overloaded
(Def
) then
3256 Subp
:= Entity
(Def
);
3259 Error_Msg_N
("premature usage of formal subprogram", Def
);
3261 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3262 Error_Msg_N
("no visible entity matches specification", Def
);
3265 -- More than one interpretation, so disambiguate as for a renaming
3270 I1
: Interp_Index
:= 0;
3276 Get_First_Interp
(Def
, I
, It
);
3277 while Present
(It
.Nam
) loop
3278 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3279 if Subp
/= Any_Id
then
3280 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3282 if It1
= No_Interp
then
3283 Error_Msg_N
("ambiguous default subprogram", Def
);
3296 Get_Next_Interp
(I
, It
);
3300 if Subp
/= Any_Id
then
3302 -- Subprogram found, generate reference to it
3304 Set_Entity
(Def
, Subp
);
3305 Generate_Reference
(Subp
, Def
);
3308 Error_Msg_N
("premature usage of formal subprogram", Def
);
3310 elsif Ekind
(Subp
) /= E_Operator
then
3311 Check_Mode_Conformant
(Subp
, Nam
);
3315 Error_Msg_N
("no visible subprogram matches specification", N
);
3321 if Has_Aspects
(N
) then
3322 Analyze_Aspect_Specifications
(N
, Nam
);
3325 end Analyze_Formal_Subprogram_Declaration
;
3327 -------------------------------------
3328 -- Analyze_Formal_Type_Declaration --
3329 -------------------------------------
3331 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3332 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3336 T
:= Defining_Identifier
(N
);
3338 if Present
(Discriminant_Specifications
(N
))
3339 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3342 ("discriminants not allowed for this formal type", T
);
3345 -- Enter the new name, and branch to specific routine
3348 when N_Formal_Private_Type_Definition
=>
3349 Analyze_Formal_Private_Type
(N
, T
, Def
);
3351 when N_Formal_Derived_Type_Definition
=>
3352 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3354 when N_Formal_Incomplete_Type_Definition
=>
3355 Analyze_Formal_Incomplete_Type
(T
, Def
);
3357 when N_Formal_Discrete_Type_Definition
=>
3358 Analyze_Formal_Discrete_Type
(T
, Def
);
3360 when N_Formal_Signed_Integer_Type_Definition
=>
3361 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3363 when N_Formal_Modular_Type_Definition
=>
3364 Analyze_Formal_Modular_Type
(T
, Def
);
3366 when N_Formal_Floating_Point_Definition
=>
3367 Analyze_Formal_Floating_Type
(T
, Def
);
3369 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3370 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3372 when N_Formal_Decimal_Fixed_Point_Definition
=>
3373 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3375 when N_Array_Type_Definition
=>
3376 Analyze_Formal_Array_Type
(T
, Def
);
3378 when N_Access_Function_Definition
3379 | N_Access_Procedure_Definition
3380 | N_Access_To_Object_Definition
3382 Analyze_Generic_Access_Type
(T
, Def
);
3384 -- Ada 2005: a interface declaration is encoded as an abstract
3385 -- record declaration or a abstract type derivation.
3387 when N_Record_Definition
=>
3388 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3390 when N_Derived_Type_Definition
=>
3391 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3397 raise Program_Error
;
3400 Set_Is_Generic_Type
(T
);
3402 if Has_Aspects
(N
) then
3403 Analyze_Aspect_Specifications
(N
, T
);
3405 end Analyze_Formal_Type_Declaration
;
3407 ------------------------------------
3408 -- Analyze_Function_Instantiation --
3409 ------------------------------------
3411 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3413 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3414 end Analyze_Function_Instantiation
;
3416 ---------------------------------
3417 -- Analyze_Generic_Access_Type --
3418 ---------------------------------
3420 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3424 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3425 Access_Type_Declaration
(T
, Def
);
3427 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3428 and then No
(Full_View
(Designated_Type
(T
)))
3429 and then not Is_Generic_Type
(Designated_Type
(T
))
3431 Error_Msg_N
("premature usage of incomplete type", Def
);
3433 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3435 ("only a subtype mark is allowed in a formal", Def
);
3439 Access_Subprogram_Declaration
(T
, Def
);
3441 end Analyze_Generic_Access_Type
;
3443 ---------------------------------
3444 -- Analyze_Generic_Formal_Part --
3445 ---------------------------------
3447 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3448 Gen_Parm_Decl
: Node_Id
;
3451 -- The generic formals are processed in the scope of the generic unit,
3452 -- where they are immediately visible. The scope is installed by the
3455 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3456 while Present
(Gen_Parm_Decl
) loop
3457 Analyze
(Gen_Parm_Decl
);
3458 Next
(Gen_Parm_Decl
);
3461 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3462 end Analyze_Generic_Formal_Part
;
3464 ------------------------------------------
3465 -- Analyze_Generic_Package_Declaration --
3466 ------------------------------------------
3468 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3469 Decls
: constant List_Id
:= Visible_Declarations
(Specification
(N
));
3470 Loc
: constant Source_Ptr
:= Sloc
(N
);
3476 Save_Parent
: Node_Id
;
3479 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3481 -- We introduce a renaming of the enclosing package, to have a usable
3482 -- entity as the prefix of an expanded name for a local entity of the
3483 -- form Par.P.Q, where P is the generic package. This is because a local
3484 -- entity named P may hide it, so that the usual visibility rules in
3485 -- the instance will not resolve properly.
3488 Make_Package_Renaming_Declaration
(Loc
,
3489 Defining_Unit_Name
=>
3490 Make_Defining_Identifier
(Loc
,
3491 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3493 Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3495 -- The declaration is inserted before other declarations, but before
3496 -- pragmas that may be library-unit pragmas and must appear before other
3497 -- declarations. The pragma Compile_Time_Error is not in this class, and
3498 -- may contain an expression that includes such a qualified name, so the
3499 -- renaming declaration must appear before it.
3501 -- Are there other pragmas that require this special handling ???
3503 if Present
(Decls
) then
3504 Decl
:= First
(Decls
);
3505 while Present
(Decl
)
3506 and then Nkind
(Decl
) = N_Pragma
3507 and then Get_Pragma_Id
(Decl
) /= Pragma_Compile_Time_Error
3512 if Present
(Decl
) then
3513 Insert_Before
(Decl
, Renaming
);
3515 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3519 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3522 -- Create copy of generic unit, and save for instantiation. If the unit
3523 -- is a child unit, do not copy the specifications for the parent, which
3524 -- are not part of the generic tree.
3526 Save_Parent
:= Parent_Spec
(N
);
3527 Set_Parent_Spec
(N
, Empty
);
3529 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3530 Set_Parent_Spec
(New_N
, Save_Parent
);
3533 -- Once the contents of the generic copy and the template are swapped,
3534 -- do the same for their respective aspect specifications.
3536 Exchange_Aspects
(N
, New_N
);
3538 -- Collect all contract-related source pragmas found within the template
3539 -- and attach them to the contract of the package spec. This contract is
3540 -- used in the capture of global references within annotations.
3542 Create_Generic_Contract
(N
);
3544 Id
:= Defining_Entity
(N
);
3545 Generate_Definition
(Id
);
3547 -- Expansion is not applied to generic units
3552 Set_Ekind
(Id
, E_Generic_Package
);
3553 Set_Etype
(Id
, Standard_Void_Type
);
3555 -- Set SPARK_Mode from context
3557 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3558 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
3559 Set_SPARK_Pragma_Inherited
(Id
);
3560 Set_SPARK_Aux_Pragma_Inherited
(Id
);
3562 -- Preserve relevant elaboration-related attributes of the context which
3563 -- are no longer available or very expensive to recompute once analysis,
3564 -- resolution, and expansion are over.
3566 Mark_Elaboration_Attributes
3570 -- Analyze aspects now, so that generated pragmas appear in the
3571 -- declarations before building and analyzing the generic copy.
3573 if Has_Aspects
(N
) then
3574 Analyze_Aspect_Specifications
(N
, Id
);
3578 Enter_Generic_Scope
(Id
);
3579 Set_Inner_Instances
(Id
, New_Elmt_List
);
3581 Set_Categorization_From_Pragmas
(N
);
3582 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3584 -- Link the declaration of the generic homonym in the generic copy to
3585 -- the package it renames, so that it is always resolved properly.
3587 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3588 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3590 -- For a library unit, we have reconstructed the entity for the unit,
3591 -- and must reset it in the library tables.
3593 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3594 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3597 Analyze_Generic_Formal_Part
(N
);
3599 -- After processing the generic formals, analysis proceeds as for a
3600 -- non-generic package.
3602 Analyze
(Specification
(N
));
3604 Validate_Categorization_Dependency
(N
, Id
);
3608 End_Package_Scope
(Id
);
3609 Exit_Generic_Scope
(Id
);
3611 -- If the generic appears within a package unit, the body of that unit
3612 -- has to be present for instantiation and inlining.
3614 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
then
3615 Set_Body_Needed_For_Inlining
3616 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3619 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3620 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3621 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3622 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3625 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3626 Validate_RT_RAT_Component
(N
);
3628 -- If this is a spec without a body, check that generic parameters
3631 if not Body_Required
(Parent
(N
)) then
3632 Check_References
(Id
);
3636 -- If there is a specified storage pool in the context, create an
3637 -- aspect on the package declaration, so that it is used in any
3638 -- instance that does not override it.
3640 if Present
(Default_Pool
) then
3646 Make_Aspect_Specification
(Loc
,
3647 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3648 Expression
=> New_Copy
(Default_Pool
));
3650 if No
(Aspect_Specifications
(Specification
(N
))) then
3651 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3653 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3657 end Analyze_Generic_Package_Declaration
;
3659 --------------------------------------------
3660 -- Analyze_Generic_Subprogram_Declaration --
3661 --------------------------------------------
3663 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3667 Result_Type
: Entity_Id
;
3668 Save_Parent
: Node_Id
;
3673 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3675 -- Create copy of generic unit, and save for instantiation. If the unit
3676 -- is a child unit, do not copy the specifications for the parent, which
3677 -- are not part of the generic tree.
3679 Save_Parent
:= Parent_Spec
(N
);
3680 Set_Parent_Spec
(N
, Empty
);
3682 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3683 Set_Parent_Spec
(New_N
, Save_Parent
);
3686 -- Once the contents of the generic copy and the template are swapped,
3687 -- do the same for their respective aspect specifications.
3689 Exchange_Aspects
(N
, New_N
);
3691 -- Collect all contract-related source pragmas found within the template
3692 -- and attach them to the contract of the subprogram spec. This contract
3693 -- is used in the capture of global references within annotations.
3695 Create_Generic_Contract
(N
);
3697 Spec
:= Specification
(N
);
3698 Id
:= Defining_Entity
(Spec
);
3699 Generate_Definition
(Id
);
3701 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3703 ("operator symbol not allowed for generic subprogram", Id
);
3709 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3711 -- Analyze the aspects of the generic copy to ensure that all generated
3712 -- pragmas (if any) perform their semantic effects.
3714 if Has_Aspects
(N
) then
3715 Analyze_Aspect_Specifications
(N
, Id
);
3719 Enter_Generic_Scope
(Id
);
3720 Set_Inner_Instances
(Id
, New_Elmt_List
);
3721 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3723 Analyze_Generic_Formal_Part
(N
);
3725 if Nkind
(Spec
) = N_Function_Specification
then
3726 Set_Ekind
(Id
, E_Generic_Function
);
3728 Set_Ekind
(Id
, E_Generic_Procedure
);
3731 -- Set SPARK_Mode from context
3733 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3734 Set_SPARK_Pragma_Inherited
(Id
);
3736 -- Preserve relevant elaboration-related attributes of the context which
3737 -- are no longer available or very expensive to recompute once analysis,
3738 -- resolution, and expansion are over.
3740 Mark_Elaboration_Attributes
3744 Formals
:= Parameter_Specifications
(Spec
);
3746 if Present
(Formals
) then
3747 Process_Formals
(Formals
, Spec
);
3750 if Nkind
(Spec
) = N_Function_Specification
then
3751 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3752 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3753 Set_Etype
(Id
, Result_Type
);
3755 -- Check restriction imposed by AI05-073: a generic function
3756 -- cannot return an abstract type or an access to such.
3758 -- This is a binding interpretation should it apply to earlier
3759 -- versions of Ada as well as Ada 2012???
3761 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
3762 and then Ada_Version
>= Ada_2012
3765 ("generic function cannot have an access result "
3766 & "that designates an abstract type", Spec
);
3770 Find_Type
(Result_Definition
(Spec
));
3771 Typ
:= Entity
(Result_Definition
(Spec
));
3773 if Is_Abstract_Type
(Typ
)
3774 and then Ada_Version
>= Ada_2012
3777 ("generic function cannot have abstract result type", Spec
);
3780 -- If a null exclusion is imposed on the result type, then create
3781 -- a null-excluding itype (an access subtype) and use it as the
3782 -- function's Etype.
3784 if Is_Access_Type
(Typ
)
3785 and then Null_Exclusion_Present
(Spec
)
3788 Create_Null_Excluding_Itype
3790 Related_Nod
=> Spec
,
3791 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3793 Set_Etype
(Id
, Typ
);
3798 Set_Etype
(Id
, Standard_Void_Type
);
3801 -- For a library unit, we have reconstructed the entity for the unit,
3802 -- and must reset it in the library tables. We also make sure that
3803 -- Body_Required is set properly in the original compilation unit node.
3805 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3806 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3807 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3810 -- If the generic appears within a package unit, the body of that unit
3811 -- has to be present for instantiation and inlining.
3813 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
3814 and then Unit_Requires_Body
(Id
)
3816 Set_Body_Needed_For_Inlining
3817 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3820 Set_Categorization_From_Pragmas
(N
);
3821 Validate_Categorization_Dependency
(N
, Id
);
3823 -- Capture all global references that occur within the profile of the
3824 -- generic subprogram. Aspects are not part of this processing because
3825 -- they must be delayed. If processed now, Save_Global_References will
3826 -- destroy the Associated_Node links and prevent the capture of global
3827 -- references when the contract of the generic subprogram is analyzed.
3829 Save_Global_References
(Original_Node
(N
));
3833 Exit_Generic_Scope
(Id
);
3834 Generate_Reference_To_Formals
(Id
);
3836 List_Inherited_Pre_Post_Aspects
(Id
);
3837 end Analyze_Generic_Subprogram_Declaration
;
3839 -----------------------------------
3840 -- Analyze_Package_Instantiation --
3841 -----------------------------------
3843 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
3844 -- must be replaced by gotos which jump to the end of the routine in order
3845 -- to restore the Ghost and SPARK modes.
3847 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
3848 Has_Inline_Always
: Boolean := False;
3850 procedure Delay_Descriptors
(E
: Entity_Id
);
3851 -- Delay generation of subprogram descriptors for given entity
3853 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean;
3854 -- If inlining is active and the generic contains inlined subprograms,
3855 -- we instantiate the body. This may cause superfluous instantiations,
3856 -- but it is simpler than detecting the need for the body at the point
3857 -- of inlining, when the context of the instance is not available.
3859 -----------------------
3860 -- Delay_Descriptors --
3861 -----------------------
3863 procedure Delay_Descriptors
(E
: Entity_Id
) is
3865 if not Delay_Subprogram_Descriptors
(E
) then
3866 Set_Delay_Subprogram_Descriptors
(E
);
3867 Pending_Descriptor
.Append
(E
);
3869 end Delay_Descriptors
;
3871 -----------------------
3872 -- Might_Inline_Subp --
3873 -----------------------
3875 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean is
3879 if not Inline_Processing_Required
then
3883 E
:= First_Entity
(Gen_Unit
);
3884 while Present
(E
) loop
3885 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
3886 -- Remember if there are any subprograms with Inline_Always
3888 if Has_Pragma_Inline_Always
(E
) then
3889 Has_Inline_Always
:= True;
3900 end Might_Inline_Subp
;
3902 -- Local declarations
3904 Gen_Id
: constant Node_Id
:= Name
(N
);
3905 Is_Actual_Pack
: constant Boolean :=
3906 Is_Internal
(Defining_Entity
(N
));
3907 Loc
: constant Source_Ptr
:= Sloc
(N
);
3909 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3910 Saved_ISMP
: constant Boolean :=
3911 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3912 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
3913 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
3914 -- Save the Ghost and SPARK mode-related data to restore on exit
3916 Saved_Style_Check
: constant Boolean := Style_Check
;
3917 -- Save style check mode for restore on exit
3920 Act_Decl_Name
: Node_Id
;
3921 Act_Decl_Id
: Entity_Id
;
3924 Env_Installed
: Boolean := False;
3927 Gen_Unit
: Entity_Id
;
3928 Inline_Now
: Boolean := False;
3929 Needs_Body
: Boolean;
3930 Parent_Installed
: Boolean := False;
3931 Renaming_List
: List_Id
;
3932 Unit_Renaming
: Node_Id
;
3934 Vis_Prims_List
: Elist_Id
:= No_Elist
;
3935 -- List of primitives made temporarily visible in the instantiation
3936 -- to match the visibility of the formal type
3938 -- Start of processing for Analyze_Package_Instantiation
3941 -- Preserve relevant elaboration-related attributes of the context which
3942 -- are no longer available or very expensive to recompute once analysis,
3943 -- resolution, and expansion are over.
3945 Mark_Elaboration_Attributes
3951 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3953 -- Very first thing: check for Text_IO special unit in case we are
3954 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
3956 Check_Text_IO_Special_Unit
(Name
(N
));
3958 -- Make node global for error reporting
3960 Instantiation_Node
:= N
;
3962 -- Case of instantiation of a generic package
3964 if Nkind
(N
) = N_Package_Instantiation
then
3965 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3966 Set_Comes_From_Source
(Act_Decl_Id
, True);
3968 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
3970 Make_Defining_Program_Unit_Name
(Loc
,
3972 New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
3973 Defining_Identifier
=> Act_Decl_Id
);
3975 Act_Decl_Name
:= Act_Decl_Id
;
3978 -- Case of instantiation of a formal package
3981 Act_Decl_Id
:= Defining_Identifier
(N
);
3982 Act_Decl_Name
:= Act_Decl_Id
;
3985 Generate_Definition
(Act_Decl_Id
);
3986 Set_Ekind
(Act_Decl_Id
, E_Package
);
3988 -- Initialize list of incomplete actuals before analysis
3990 Set_Incomplete_Actuals
(Act_Decl_Id
, New_Elmt_List
);
3992 Preanalyze_Actuals
(N
, Act_Decl_Id
);
3994 -- Turn off style checking in instances. If the check is enabled on the
3995 -- generic unit, a warning in an instance would just be noise. If not
3996 -- enabled on the generic, then a warning in an instance is just wrong.
3997 -- This must be done after analyzing the actuals, which do come from
3998 -- source and are subject to style checking.
4000 Style_Check
:= False;
4003 Env_Installed
:= True;
4005 -- Reset renaming map for formal types. The mapping is established
4006 -- when analyzing the generic associations, but some mappings are
4007 -- inherited from formal packages of parent units, and these are
4008 -- constructed when the parents are installed.
4010 Generic_Renamings
.Set_Last
(0);
4011 Generic_Renamings_HTable
.Reset
;
4013 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4014 Gen_Unit
:= Entity
(Gen_Id
);
4016 -- A package instantiation is Ghost when it is subject to pragma Ghost
4017 -- or the generic template is Ghost. Set the mode now to ensure that
4018 -- any nodes generated during analysis and expansion are marked as
4021 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
4023 -- Verify that it is the name of a generic package
4025 -- A visibility glitch: if the instance is a child unit and the generic
4026 -- is the generic unit of a parent instance (i.e. both the parent and
4027 -- the child units are instances of the same package) the name now
4028 -- denotes the renaming within the parent, not the intended generic
4029 -- unit. See if there is a homonym that is the desired generic. The
4030 -- renaming declaration must be visible inside the instance of the
4031 -- child, but not when analyzing the name in the instantiation itself.
4033 if Ekind
(Gen_Unit
) = E_Package
4034 and then Present
(Renamed_Entity
(Gen_Unit
))
4035 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
4036 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
4037 and then Present
(Homonym
(Gen_Unit
))
4039 Gen_Unit
:= Homonym
(Gen_Unit
);
4042 if Etype
(Gen_Unit
) = Any_Type
then
4046 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
4048 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
4050 if From_Limited_With
(Gen_Unit
) then
4052 ("cannot instantiate a limited withed package", Gen_Id
);
4055 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
4062 if In_Extended_Main_Source_Unit
(N
) then
4063 Set_Is_Instantiated
(Gen_Unit
);
4064 Generate_Reference
(Gen_Unit
, N
);
4066 if Present
(Renamed_Object
(Gen_Unit
)) then
4067 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
4068 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
4072 if Nkind
(Gen_Id
) = N_Identifier
4073 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4076 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4078 elsif Nkind
(Gen_Id
) = N_Expanded_Name
4079 and then Is_Child_Unit
(Gen_Unit
)
4080 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
4081 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
4084 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
4087 Set_Entity
(Gen_Id
, Gen_Unit
);
4089 -- If generic is a renaming, get original generic unit
4091 if Present
(Renamed_Object
(Gen_Unit
))
4092 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
4094 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4097 -- Verify that there are no circular instantiations
4099 if In_Open_Scopes
(Gen_Unit
) then
4100 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4104 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4105 Error_Msg_Node_2
:= Current_Scope
;
4107 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4108 Circularity_Detected
:= True;
4113 -- If the context of the instance is subject to SPARK_Mode "off" or
4114 -- the annotation is altogether missing, set the global flag which
4115 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
4118 if SPARK_Mode
/= On
then
4119 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4121 -- Mark the instance spec in case the body is instantiated at a
4122 -- later pass. This preserves the original context in effect for
4125 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
4128 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4129 Gen_Spec
:= Specification
(Gen_Decl
);
4131 -- Initialize renamings map, for error checking, and the list that
4132 -- holds private entities whose views have changed between generic
4133 -- definition and instantiation. If this is the instance created to
4134 -- validate an actual package, the instantiation environment is that
4135 -- of the enclosing instance.
4137 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
4139 -- Copy original generic tree, to produce text for instantiation
4143 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4145 Act_Spec
:= Specification
(Act_Tree
);
4147 -- If this is the instance created to validate an actual package,
4148 -- only the formals matter, do not examine the package spec itself.
4150 if Is_Actual_Pack
then
4151 Set_Visible_Declarations
(Act_Spec
, New_List
);
4152 Set_Private_Declarations
(Act_Spec
, New_List
);
4156 Analyze_Associations
4158 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4159 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4161 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4163 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
4164 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
4165 Set_Is_Generic_Instance
(Act_Decl_Id
);
4166 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4168 -- References to the generic in its own declaration or its body are
4169 -- references to the instance. Add a renaming declaration for the
4170 -- generic unit itself. This declaration, as well as the renaming
4171 -- declarations for the generic formals, must remain private to the
4172 -- unit: the formals, because this is the language semantics, and
4173 -- the unit because its use is an artifact of the implementation.
4176 Make_Package_Renaming_Declaration
(Loc
,
4177 Defining_Unit_Name
=>
4178 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
4179 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
4181 Append
(Unit_Renaming
, Renaming_List
);
4183 -- The renaming declarations are the first local declarations of the
4186 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
4188 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
4190 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
4193 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
4195 -- Propagate the aspect specifications from the package declaration
4196 -- template to the instantiated version of the package declaration.
4198 if Has_Aspects
(Act_Tree
) then
4199 Set_Aspect_Specifications
(Act_Decl
,
4200 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
4203 -- The generic may have a generated Default_Storage_Pool aspect,
4204 -- set at the point of generic declaration. If the instance has
4205 -- that aspect, it overrides the one inherited from the generic.
4207 if Has_Aspects
(Gen_Spec
) then
4208 if No
(Aspect_Specifications
(N
)) then
4209 Set_Aspect_Specifications
(N
,
4211 (Aspect_Specifications
(Gen_Spec
))));
4215 ASN1
, ASN2
: Node_Id
;
4218 ASN1
:= First
(Aspect_Specifications
(N
));
4219 while Present
(ASN1
) loop
4220 if Chars
(Identifier
(ASN1
)) = Name_Default_Storage_Pool
4222 -- If generic carries a default storage pool, remove
4223 -- it in favor of the instance one.
4225 ASN2
:= First
(Aspect_Specifications
(Gen_Spec
));
4226 while Present
(ASN2
) loop
4227 if Chars
(Identifier
(ASN2
)) =
4228 Name_Default_Storage_Pool
4241 Prepend_List_To
(Aspect_Specifications
(N
),
4243 (Aspect_Specifications
(Gen_Spec
))));
4248 -- Save the instantiation node, for subsequent instantiation of the
4249 -- body, if there is one and we are generating code for the current
4250 -- unit. Mark unit as having a body (avoids premature error message).
4252 -- We instantiate the body if we are generating code, if we are
4253 -- generating cross-reference information, or if we are building
4254 -- trees for ASIS use or GNATprove use.
4257 Enclosing_Body_Present
: Boolean := False;
4258 -- If the generic unit is not a compilation unit, then a body may
4259 -- be present in its parent even if none is required. We create a
4260 -- tentative pending instantiation for the body, which will be
4261 -- discarded if none is actually present.
4266 if Scope
(Gen_Unit
) /= Standard_Standard
4267 and then not Is_Child_Unit
(Gen_Unit
)
4269 Scop
:= Scope
(Gen_Unit
);
4270 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
4271 if Unit_Requires_Body
(Scop
) then
4272 Enclosing_Body_Present
:= True;
4275 elsif In_Open_Scopes
(Scop
)
4276 and then In_Package_Body
(Scop
)
4278 Enclosing_Body_Present
:= True;
4282 exit when Is_Compilation_Unit
(Scop
);
4283 Scop
:= Scope
(Scop
);
4287 -- If front-end inlining is enabled or there are any subprograms
4288 -- marked with Inline_Always, and this is a unit for which code
4289 -- will be generated, we instantiate the body at once.
4291 -- This is done if the instance is not the main unit, and if the
4292 -- generic is not a child unit of another generic, to avoid scope
4293 -- problems and the reinstallation of parent instances.
4296 and then (not Is_Child_Unit
(Gen_Unit
)
4297 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4298 and then Might_Inline_Subp
(Gen_Unit
)
4299 and then not Is_Actual_Pack
4301 if not Back_End_Inlining
4302 and then (Front_End_Inlining
or else Has_Inline_Always
)
4303 and then (Is_In_Main_Unit
(N
)
4304 or else In_Main_Context
(Current_Scope
))
4305 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4309 -- In configurable_run_time mode we force the inlining of
4310 -- predefined subprograms marked Inline_Always, to minimize
4311 -- the use of the run-time library.
4313 elsif In_Predefined_Unit
(Gen_Decl
)
4314 and then Configurable_Run_Time_Mode
4315 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4320 -- If the current scope is itself an instance within a child
4321 -- unit, there will be duplications in the scope stack, and the
4322 -- unstacking mechanism in Inline_Instance_Body will fail.
4323 -- This loses some rare cases of optimization, and might be
4324 -- improved some day, if we can find a proper abstraction for
4325 -- "the complete compilation context" that can be saved and
4328 if Is_Generic_Instance
(Current_Scope
) then
4330 Curr_Unit
: constant Entity_Id
:=
4331 Cunit_Entity
(Current_Sem_Unit
);
4333 if Curr_Unit
/= Current_Scope
4334 and then Is_Child_Unit
(Curr_Unit
)
4336 Inline_Now
:= False;
4343 (Unit_Requires_Body
(Gen_Unit
)
4344 or else Enclosing_Body_Present
4345 or else Present
(Corresponding_Body
(Gen_Decl
)))
4346 and then (Is_In_Main_Unit
(N
)
4347 or else Might_Inline_Subp
(Gen_Unit
))
4348 and then not Is_Actual_Pack
4349 and then not Inline_Now
4350 and then (Operating_Mode
= Generate_Code
4352 -- Need comment for this check ???
4354 or else (Operating_Mode
= Check_Semantics
4355 and then (ASIS_Mode
or GNATprove_Mode
)));
4357 -- If front-end inlining is enabled or there are any subprograms
4358 -- marked with Inline_Always, do not instantiate body when within
4359 -- a generic context.
4361 if ((Front_End_Inlining
or else Has_Inline_Always
)
4362 and then not Expander_Active
)
4363 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
4365 Needs_Body
:= False;
4368 -- If the current context is generic, and the package being
4369 -- instantiated is declared within a formal package, there is no
4370 -- body to instantiate until the enclosing generic is instantiated
4371 -- and there is an actual for the formal package. If the formal
4372 -- package has parameters, we build a regular package instance for
4373 -- it, that precedes the original formal package declaration.
4375 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4377 Decl
: constant Node_Id
:=
4379 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4381 if Nkind
(Decl
) = N_Formal_Package_Declaration
4382 or else (Nkind
(Decl
) = N_Package_Declaration
4383 and then Is_List_Member
(Decl
)
4384 and then Present
(Next
(Decl
))
4386 Nkind
(Next
(Decl
)) =
4387 N_Formal_Package_Declaration
)
4389 Needs_Body
:= False;
4395 -- For RCI unit calling stubs, we omit the instance body if the
4396 -- instance is the RCI library unit itself.
4398 -- However there is a special case for nested instances: in this case
4399 -- we do generate the instance body, as it might be required, e.g.
4400 -- because it provides stream attributes for some type used in the
4401 -- profile of a remote subprogram. This is consistent with 12.3(12),
4402 -- which indicates that the instance body occurs at the place of the
4403 -- instantiation, and thus is part of the RCI declaration, which is
4404 -- present on all client partitions (this is E.2.3(18)).
4406 -- Note that AI12-0002 may make it illegal at some point to have
4407 -- stream attributes defined in an RCI unit, in which case this
4408 -- special case will become unnecessary. In the meantime, there
4409 -- is known application code in production that depends on this
4410 -- being possible, so we definitely cannot eliminate the body in
4411 -- the case of nested instances for the time being.
4413 -- When we generate a nested instance body, calling stubs for any
4414 -- relevant subprogram will be be inserted immediately after the
4415 -- subprogram declarations, and will take precedence over the
4416 -- subsequent (original) body. (The stub and original body will be
4417 -- complete homographs, but this is permitted in an instance).
4418 -- (Could we do better and remove the original body???)
4420 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4421 and then Comes_From_Source
(N
)
4422 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4424 Needs_Body
:= False;
4429 -- Here is a defence against a ludicrous number of instantiations
4430 -- caused by a circular set of instantiation attempts.
4432 if Pending_Instantiations
.Last
> Maximum_Instantiations
then
4433 Error_Msg_Uint_1
:= UI_From_Int
(Maximum_Instantiations
);
4434 Error_Msg_N
("too many instantiations, exceeds max of^", N
);
4435 Error_Msg_N
("\limit can be changed using -gnateinn switch", N
);
4436 raise Unrecoverable_Error
;
4439 -- Indicate that the enclosing scopes contain an instantiation,
4440 -- and that cleanup actions should be delayed until after the
4441 -- instance body is expanded.
4443 Check_Forward_Instantiation
(Gen_Decl
);
4444 if Nkind
(N
) = N_Package_Instantiation
then
4446 Enclosing_Master
: Entity_Id
;
4449 -- Loop to search enclosing masters
4451 Enclosing_Master
:= Current_Scope
;
4452 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
4453 if Ekind
(Enclosing_Master
) = E_Package
then
4454 if Is_Compilation_Unit
(Enclosing_Master
) then
4455 if In_Package_Body
(Enclosing_Master
) then
4457 (Body_Entity
(Enclosing_Master
));
4466 Enclosing_Master
:= Scope
(Enclosing_Master
);
4469 elsif Is_Generic_Unit
(Enclosing_Master
)
4470 or else Ekind
(Enclosing_Master
) = E_Void
4472 -- Cleanup actions will eventually be performed on the
4473 -- enclosing subprogram or package instance, if any.
4474 -- Enclosing scope is void in the formal part of a
4475 -- generic subprogram.
4480 if Ekind
(Enclosing_Master
) = E_Entry
4482 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
4484 if not Expander_Active
then
4488 Protected_Body_Subprogram
(Enclosing_Master
);
4492 Set_Delay_Cleanups
(Enclosing_Master
);
4494 while Ekind
(Enclosing_Master
) = E_Block
loop
4495 Enclosing_Master
:= Scope
(Enclosing_Master
);
4498 if Is_Subprogram
(Enclosing_Master
) then
4499 Delay_Descriptors
(Enclosing_Master
);
4501 elsif Is_Task_Type
(Enclosing_Master
) then
4503 TBP
: constant Node_Id
:=
4504 Get_Task_Body_Procedure
4507 if Present
(TBP
) then
4508 Delay_Descriptors
(TBP
);
4509 Set_Delay_Cleanups
(TBP
);
4516 end loop Scope_Loop
;
4519 -- Make entry in table
4521 Add_Pending_Instantiation
(N
, Act_Decl
);
4525 Set_Categorization_From_Pragmas
(Act_Decl
);
4527 if Parent_Installed
then
4531 Set_Instance_Spec
(N
, Act_Decl
);
4533 -- If not a compilation unit, insert the package declaration before
4534 -- the original instantiation node.
4536 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4537 Mark_Rewrite_Insertion
(Act_Decl
);
4538 Insert_Before
(N
, Act_Decl
);
4540 if Has_Aspects
(N
) then
4541 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4543 -- The pragma created for a Default_Storage_Pool aspect must
4544 -- appear ahead of the declarations in the instance spec.
4545 -- Analysis has placed it after the instance node, so remove
4546 -- it and reinsert it properly now.
4549 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4550 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4554 if A_Name
= Name_Default_Storage_Pool
then
4555 if No
(Visible_Declarations
(Act_Spec
)) then
4556 Set_Visible_Declarations
(Act_Spec
, New_List
);
4560 while Present
(Decl
) loop
4561 if Nkind
(Decl
) = N_Pragma
then
4563 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4575 -- For an instantiation that is a compilation unit, place
4576 -- declaration on current node so context is complete for analysis
4577 -- (including nested instantiations). If this is the main unit,
4578 -- the declaration eventually replaces the instantiation node.
4579 -- If the instance body is created later, it replaces the
4580 -- instance node, and the declaration is attached to it
4581 -- (see Build_Instance_Compilation_Unit_Nodes).
4584 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4586 -- The entity for the current unit is the newly created one,
4587 -- and all semantic information is attached to it.
4589 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4591 -- If this is the main unit, replace the main entity as well
4593 if Current_Sem_Unit
= Main_Unit
then
4594 Main_Unit_Entity
:= Act_Decl_Id
;
4598 Set_Unit
(Parent
(N
), Act_Decl
);
4599 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4600 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4602 -- Process aspect specifications of the instance node, if any, to
4603 -- take into account categorization pragmas before analyzing the
4606 if Has_Aspects
(N
) then
4607 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4611 Set_Unit
(Parent
(N
), N
);
4612 Set_Body_Required
(Parent
(N
), False);
4615 -- Save the scenario for later examination by the ABE Processing
4618 Record_Elaboration_Scenario
(N
);
4620 -- The instantiation results in a guaranteed ABE
4622 if Is_Known_Guaranteed_ABE
(N
) and then Needs_Body
then
4624 -- Do not instantiate the corresponding body because gigi cannot
4625 -- handle certain types of premature instantiations.
4627 Pending_Instantiations
.Decrement_Last
;
4629 -- Create completing bodies for all subprogram declarations since
4630 -- their real bodies will not be instantiated.
4632 Provide_Completing_Bodies
(Instance_Spec
(N
));
4635 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4637 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4638 First_Private_Entity
(Act_Decl_Id
));
4640 -- If the instantiation will receive a body, the unit will be
4641 -- transformed into a package body, and receive its own elaboration
4642 -- entity. Otherwise, the nature of the unit is now a package
4645 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4646 and then not Needs_Body
4648 Rewrite
(N
, Act_Decl
);
4651 if Present
(Corresponding_Body
(Gen_Decl
))
4652 or else Unit_Requires_Body
(Gen_Unit
)
4654 Set_Has_Completion
(Act_Decl_Id
);
4657 Check_Formal_Packages
(Act_Decl_Id
);
4659 Restore_Hidden_Primitives
(Vis_Prims_List
);
4660 Restore_Private_Views
(Act_Decl_Id
);
4662 Inherit_Context
(Gen_Decl
, N
);
4664 if Parent_Installed
then
4669 Env_Installed
:= False;
4672 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4674 -- There used to be a check here to prevent instantiations in local
4675 -- contexts if the No_Local_Allocators restriction was active. This
4676 -- check was removed by a binding interpretation in AI-95-00130/07,
4677 -- but we retain the code for documentation purposes.
4679 -- if Ekind (Act_Decl_Id) /= E_Void
4680 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4682 -- Check_Restriction (No_Local_Allocators, N);
4686 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4689 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4690 -- be used as defining identifiers for a formal package and for the
4691 -- corresponding expanded package.
4693 if Nkind
(N
) = N_Formal_Package_Declaration
then
4694 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4695 Set_Comes_From_Source
(Act_Decl_Id
, True);
4696 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
4697 Set_Defining_Identifier
(N
, Act_Decl_Id
);
4700 -- Check that if N is an instantiation of System.Dim_Float_IO or
4701 -- System.Dim_Integer_IO, the formal type has a dimension system.
4703 if Nkind
(N
) = N_Package_Instantiation
4704 and then Is_Dim_IO_Package_Instantiation
(N
)
4707 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4709 if not Has_Dimension_System
4710 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4712 Error_Msg_N
("type with a dimension system expected", Assoc
);
4718 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4719 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4722 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4723 Restore_Ghost_Mode
(Saved_GM
);
4724 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4725 Style_Check
:= Saved_Style_Check
;
4728 when Instantiation_Error
=>
4729 if Parent_Installed
then
4733 if Env_Installed
then
4737 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4738 Restore_Ghost_Mode
(Saved_GM
);
4739 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4740 Style_Check
:= Saved_Style_Check
;
4741 end Analyze_Package_Instantiation
;
4743 --------------------------
4744 -- Inline_Instance_Body --
4745 --------------------------
4747 -- WARNING: This routine manages SPARK regions. Return statements must be
4748 -- replaced by gotos which jump to the end of the routine and restore the
4751 procedure Inline_Instance_Body
4753 Gen_Unit
: Entity_Id
;
4756 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
4757 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
4758 Gen_Comp
: constant Entity_Id
:=
4759 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
4761 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
4762 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
4763 -- Save the SPARK mode-related data to restore on exit. Removing
4764 -- enclosing scopes to provide a clean environment for analysis of
4765 -- the inlined body will eliminate any previously set SPARK_Mode.
4767 Scope_Stack_Depth
: constant Pos
:=
4768 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
4770 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4771 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4772 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
4774 Curr_Scope
: Entity_Id
:= Empty
;
4775 List
: Elist_Id
:= No_Elist
; -- init to avoid warning
4776 N_Instances
: Nat
:= 0;
4777 Num_Inner
: Nat
:= 0;
4778 Num_Scopes
: Nat
:= 0;
4779 Removed
: Boolean := False;
4784 -- Case of generic unit defined in another unit. We must remove the
4785 -- complete context of the current unit to install that of the generic.
4787 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
4789 -- Add some comments for the following two loops ???
4792 while Present
(S
) and then S
/= Standard_Standard
loop
4794 Num_Scopes
:= Num_Scopes
+ 1;
4796 Use_Clauses
(Num_Scopes
) :=
4798 (Scope_Stack
.Last
- Num_Scopes
+ 1).
4800 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
4802 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
4803 or else Scope_Stack
.Table
4804 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
4807 exit when Is_Generic_Instance
(S
)
4808 and then (In_Package_Body
(S
)
4809 or else Ekind
(S
) = E_Procedure
4810 or else Ekind
(S
) = E_Function
);
4814 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
4816 -- Find and save all enclosing instances
4821 and then S
/= Standard_Standard
4823 if Is_Generic_Instance
(S
) then
4824 N_Instances
:= N_Instances
+ 1;
4825 Instances
(N_Instances
) := S
;
4827 exit when In_Package_Body
(S
);
4833 -- Remove context of current compilation unit, unless we are within a
4834 -- nested package instantiation, in which case the context has been
4835 -- removed previously.
4837 -- If current scope is the body of a child unit, remove context of
4838 -- spec as well. If an enclosing scope is an instance body, the
4839 -- context has already been removed, but the entities in the body
4840 -- must be made invisible as well.
4843 while Present
(S
) and then S
/= Standard_Standard
loop
4844 if Is_Generic_Instance
(S
)
4845 and then (In_Package_Body
(S
)
4846 or else Ekind_In
(S
, E_Procedure
, E_Function
))
4848 -- We still have to remove the entities of the enclosing
4849 -- instance from direct visibility.
4854 E
:= First_Entity
(S
);
4855 while Present
(E
) loop
4856 Set_Is_Immediately_Visible
(E
, False);
4865 or else (Ekind
(Curr_Unit
) = E_Package_Body
4866 and then S
= Spec_Entity
(Curr_Unit
))
4867 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
4868 and then S
= Corresponding_Spec
4869 (Unit_Declaration_Node
(Curr_Unit
)))
4873 -- Remove entities in current scopes from visibility, so that
4874 -- instance body is compiled in a clean environment.
4876 List
:= Save_Scope_Stack
(Handle_Use
=> False);
4878 if Is_Child_Unit
(S
) then
4880 -- Remove child unit from stack, as well as inner scopes.
4881 -- Removing the context of a child unit removes parent units
4884 while Current_Scope
/= S
loop
4885 Num_Inner
:= Num_Inner
+ 1;
4886 Inner_Scopes
(Num_Inner
) := Current_Scope
;
4891 Remove_Context
(Curr_Comp
);
4895 Remove_Context
(Curr_Comp
);
4898 if Ekind
(Curr_Unit
) = E_Package_Body
then
4899 Remove_Context
(Library_Unit
(Curr_Comp
));
4906 pragma Assert
(Num_Inner
< Num_Scopes
);
4908 -- The inlined package body must be analyzed with the SPARK_Mode of
4909 -- the enclosing context, otherwise the body may cause bogus errors
4910 -- if a configuration SPARK_Mode pragma in in effect.
4912 Push_Scope
(Standard_Standard
);
4913 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
4914 Instantiate_Package_Body
4917 Act_Decl
=> Act_Decl
,
4918 Expander_Status
=> Expander_Active
,
4919 Current_Sem_Unit
=> Current_Sem_Unit
,
4920 Scope_Suppress
=> Scope_Suppress
,
4921 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4922 Version
=> Ada_Version
,
4923 Version_Pragma
=> Ada_Version_Pragma
,
4924 Warnings
=> Save_Warnings
,
4925 SPARK_Mode
=> Saved_SM
,
4926 SPARK_Mode_Pragma
=> Saved_SMP
)),
4927 Inlined_Body
=> True);
4933 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
4935 -- Reset Generic_Instance flag so that use clauses can be installed
4936 -- in the proper order. (See Use_One_Package for effect of enclosing
4937 -- instances on processing of use clauses).
4939 for J
in 1 .. N_Instances
loop
4940 Set_Is_Generic_Instance
(Instances
(J
), False);
4944 Install_Context
(Curr_Comp
, Chain
=> False);
4946 if Present
(Curr_Scope
)
4947 and then Is_Child_Unit
(Curr_Scope
)
4949 Push_Scope
(Curr_Scope
);
4950 Set_Is_Immediately_Visible
(Curr_Scope
);
4952 -- Finally, restore inner scopes as well
4954 for J
in reverse 1 .. Num_Inner
loop
4955 Push_Scope
(Inner_Scopes
(J
));
4959 Restore_Scope_Stack
(List
, Handle_Use
=> False);
4961 if Present
(Curr_Scope
)
4963 (In_Private_Part
(Curr_Scope
)
4964 or else In_Package_Body
(Curr_Scope
))
4966 -- Install private declaration of ancestor units, which are
4967 -- currently available. Restore_Scope_Stack and Install_Context
4968 -- only install the visible part of parents.
4973 Par
:= Scope
(Curr_Scope
);
4974 while (Present
(Par
)) and then Par
/= Standard_Standard
loop
4975 Install_Private_Declarations
(Par
);
4982 -- Restore use clauses. For a child unit, use clauses in the parents
4983 -- are restored when installing the context, so only those in inner
4984 -- scopes (and those local to the child unit itself) need to be
4985 -- installed explicitly.
4987 if Is_Child_Unit
(Curr_Unit
) and then Removed
then
4988 for J
in reverse 1 .. Num_Inner
+ 1 loop
4989 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4991 Install_Use_Clauses
(Use_Clauses
(J
));
4995 for J
in reverse 1 .. Num_Scopes
loop
4996 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
4998 Install_Use_Clauses
(Use_Clauses
(J
));
5002 -- Restore status of instances. If one of them is a body, make its
5003 -- local entities visible again.
5010 for J
in 1 .. N_Instances
loop
5011 Inst
:= Instances
(J
);
5012 Set_Is_Generic_Instance
(Inst
, True);
5014 if In_Package_Body
(Inst
)
5015 or else Ekind_In
(S
, E_Procedure
, E_Function
)
5017 E
:= First_Entity
(Instances
(J
));
5018 while Present
(E
) loop
5019 Set_Is_Immediately_Visible
(E
);
5026 -- If generic unit is in current unit, current context is correct. Note
5027 -- that the context is guaranteed to carry the correct SPARK_Mode as no
5028 -- enclosing scopes were removed.
5031 Instantiate_Package_Body
5034 Act_Decl
=> Act_Decl
,
5035 Expander_Status
=> Expander_Active
,
5036 Current_Sem_Unit
=> Current_Sem_Unit
,
5037 Scope_Suppress
=> Scope_Suppress
,
5038 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5039 Version
=> Ada_Version
,
5040 Version_Pragma
=> Ada_Version_Pragma
,
5041 Warnings
=> Save_Warnings
,
5042 SPARK_Mode
=> SPARK_Mode
,
5043 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
5044 Inlined_Body
=> True);
5046 end Inline_Instance_Body
;
5048 -------------------------------------
5049 -- Analyze_Procedure_Instantiation --
5050 -------------------------------------
5052 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
5054 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
5055 end Analyze_Procedure_Instantiation
;
5057 -----------------------------------
5058 -- Need_Subprogram_Instance_Body --
5059 -----------------------------------
5061 function Need_Subprogram_Instance_Body
5063 Subp
: Entity_Id
) return Boolean
5065 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean;
5066 -- Return True if E is an inlined subprogram, an inlined renaming or a
5067 -- subprogram nested in an inlined subprogram. The inlining machinery
5068 -- totally disregards nested subprograms since it considers that they
5069 -- will always be compiled if the parent is (see Inline.Is_Nested).
5071 ------------------------------------
5072 -- Is_Inlined_Or_Child_Of_Inlined --
5073 ------------------------------------
5075 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean is
5079 if Is_Inlined
(E
) or else Is_Inlined
(Alias
(E
)) then
5084 while Scop
/= Standard_Standard
loop
5085 if Ekind
(Scop
) in Subprogram_Kind
and then Is_Inlined
(Scop
) then
5089 Scop
:= Scope
(Scop
);
5093 end Is_Inlined_Or_Child_Of_Inlined
;
5096 -- Must be in the main unit or inlined (or child of inlined)
5098 if (Is_In_Main_Unit
(N
) or else Is_Inlined_Or_Child_Of_Inlined
(Subp
))
5100 -- Must be generating code or analyzing code in ASIS/GNATprove mode
5102 and then (Operating_Mode
= Generate_Code
5103 or else (Operating_Mode
= Check_Semantics
5104 and then (ASIS_Mode
or GNATprove_Mode
)))
5106 -- The body is needed when generating code (full expansion), in ASIS
5107 -- mode for other tools, and in GNATprove mode (special expansion) for
5108 -- formal verification of the body itself.
5110 and then (Expander_Active
or ASIS_Mode
or GNATprove_Mode
)
5112 -- No point in inlining if ABE is inevitable
5114 and then not Is_Known_Guaranteed_ABE
(N
)
5116 -- Or if subprogram is eliminated
5118 and then not Is_Eliminated
(Subp
)
5120 Add_Pending_Instantiation
(N
, Unit_Declaration_Node
(Subp
));
5123 -- Here if not inlined, or we ignore the inlining
5128 end Need_Subprogram_Instance_Body
;
5130 --------------------------------------
5131 -- Analyze_Subprogram_Instantiation --
5132 --------------------------------------
5134 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
5135 -- must be replaced by gotos which jump to the end of the routine in order
5136 -- to restore the Ghost and SPARK modes.
5138 procedure Analyze_Subprogram_Instantiation
5142 Loc
: constant Source_Ptr
:= Sloc
(N
);
5143 Gen_Id
: constant Node_Id
:= Name
(N
);
5144 Errs
: constant Nat
:= Serious_Errors_Detected
;
5146 Anon_Id
: constant Entity_Id
:=
5147 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
5148 Chars
=> New_External_Name
5149 (Chars
(Defining_Entity
(N
)), 'R'));
5151 Act_Decl_Id
: Entity_Id
:= Empty
; -- init to avoid warning
5156 Env_Installed
: Boolean := False;
5157 Gen_Unit
: Entity_Id
;
5159 Pack_Id
: Entity_Id
;
5160 Parent_Installed
: Boolean := False;
5162 Renaming_List
: List_Id
;
5163 -- The list of declarations that link formals and actuals of the
5164 -- instance. These are subtype declarations for formal types, and
5165 -- renaming declarations for other formals. The subprogram declaration
5166 -- for the instance is then appended to the list, and the last item on
5167 -- the list is the renaming declaration for the instance.
5169 procedure Analyze_Instance_And_Renamings
;
5170 -- The instance must be analyzed in a context that includes the mappings
5171 -- of generic parameters into actuals. We create a package declaration
5172 -- for this purpose, and a subprogram with an internal name within the
5173 -- package. The subprogram instance is simply an alias for the internal
5174 -- subprogram, declared in the current scope.
5176 procedure Build_Subprogram_Renaming
;
5177 -- If the subprogram is recursive, there are occurrences of the name of
5178 -- the generic within the body, which must resolve to the current
5179 -- instance. We add a renaming declaration after the declaration, which
5180 -- is available in the instance body, as well as in the analysis of
5181 -- aspects that appear in the generic. This renaming declaration is
5182 -- inserted after the instance declaration which it renames.
5184 ------------------------------------
5185 -- Analyze_Instance_And_Renamings --
5186 ------------------------------------
5188 procedure Analyze_Instance_And_Renamings
is
5189 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
5190 Pack_Decl
: Node_Id
;
5193 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5195 -- For the case of a compilation unit, the container package has
5196 -- the same name as the instantiation, to insure that the binder
5197 -- calls the elaboration procedure with the right name. Copy the
5198 -- entity of the instance, which may have compilation level flags
5199 -- (e.g. Is_Child_Unit) set.
5201 Pack_Id
:= New_Copy
(Def_Ent
);
5204 -- Otherwise we use the name of the instantiation concatenated
5205 -- with its source position to ensure uniqueness if there are
5206 -- several instantiations with the same name.
5209 Make_Defining_Identifier
(Loc
,
5210 Chars
=> New_External_Name
5211 (Related_Id
=> Chars
(Def_Ent
),
5213 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
5217 Make_Package_Declaration
(Loc
,
5218 Specification
=> Make_Package_Specification
(Loc
,
5219 Defining_Unit_Name
=> Pack_Id
,
5220 Visible_Declarations
=> Renaming_List
,
5221 End_Label
=> Empty
));
5223 Set_Instance_Spec
(N
, Pack_Decl
);
5224 Set_Is_Generic_Instance
(Pack_Id
);
5225 Set_Debug_Info_Needed
(Pack_Id
);
5227 -- Case of not a compilation unit
5229 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5230 Mark_Rewrite_Insertion
(Pack_Decl
);
5231 Insert_Before
(N
, Pack_Decl
);
5232 Set_Has_Completion
(Pack_Id
);
5234 -- Case of an instantiation that is a compilation unit
5236 -- Place declaration on current node so context is complete for
5237 -- analysis (including nested instantiations), and for use in a
5238 -- context_clause (see Analyze_With_Clause).
5241 Set_Unit
(Parent
(N
), Pack_Decl
);
5242 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
5245 Analyze
(Pack_Decl
);
5246 Check_Formal_Packages
(Pack_Id
);
5247 Set_Is_Generic_Instance
(Pack_Id
, False);
5249 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
5252 -- Body of the enclosing package is supplied when instantiating the
5253 -- subprogram body, after semantic analysis is completed.
5255 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5257 -- Remove package itself from visibility, so it does not
5258 -- conflict with subprogram.
5260 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
5262 -- Set name and scope of internal subprogram so that the proper
5263 -- external name will be generated. The proper scope is the scope
5264 -- of the wrapper package. We need to generate debugging info for
5265 -- the internal subprogram, so set flag accordingly.
5267 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
5268 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
5270 -- Mark wrapper package as referenced, to avoid spurious warnings
5271 -- if the instantiation appears in various with_ clauses of
5272 -- subunits of the main unit.
5274 Set_Referenced
(Pack_Id
);
5277 Set_Is_Generic_Instance
(Anon_Id
);
5278 Set_Debug_Info_Needed
(Anon_Id
);
5279 Act_Decl_Id
:= New_Copy
(Anon_Id
);
5281 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5282 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5283 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5285 -- Subprogram instance comes from source only if generic does
5287 Set_Comes_From_Source
(Act_Decl_Id
, Comes_From_Source
(Gen_Unit
));
5289 -- If the instance is a child unit, mark the Id accordingly. Mark
5290 -- the anonymous entity as well, which is the real subprogram and
5291 -- which is used when the instance appears in a context clause.
5292 -- Similarly, propagate the Is_Eliminated flag to handle properly
5293 -- nested eliminated subprograms.
5295 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5296 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5297 New_Overloaded_Entity
(Act_Decl_Id
);
5298 Check_Eliminated
(Act_Decl_Id
);
5299 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5301 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5302 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5303 Set_Is_Compilation_Unit
(Anon_Id
);
5305 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5308 -- The instance is not a freezing point for the new subprogram.
5309 -- The anonymous subprogram may have a freeze node, created for
5310 -- some delayed aspects. This freeze node must not be inherited
5311 -- by the visible subprogram entity.
5313 Set_Is_Frozen
(Act_Decl_Id
, False);
5314 Set_Freeze_Node
(Act_Decl_Id
, Empty
);
5316 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5317 Valid_Operator_Definition
(Act_Decl_Id
);
5320 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5321 Set_Has_Completion
(Act_Decl_Id
);
5322 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5324 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5325 Set_Body_Required
(Parent
(N
), False);
5327 end Analyze_Instance_And_Renamings
;
5329 -------------------------------
5330 -- Build_Subprogram_Renaming --
5331 -------------------------------
5333 procedure Build_Subprogram_Renaming
is
5334 Renaming_Decl
: Node_Id
;
5335 Unit_Renaming
: Node_Id
;
5339 Make_Subprogram_Renaming_Declaration
(Loc
,
5342 (Specification
(Original_Node
(Gen_Decl
)),
5344 Instantiating
=> True),
5345 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
5347 -- The generic may be a a child unit. The renaming needs an
5348 -- identifier with the proper name.
5350 Set_Defining_Unit_Name
(Specification
(Unit_Renaming
),
5351 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)));
5353 -- If there is a formal subprogram with the same name as the unit
5354 -- itself, do not add this renaming declaration, to prevent
5355 -- ambiguities when there is a call with that name in the body.
5356 -- This is a partial and ugly fix for one ACATS test. ???
5358 Renaming_Decl
:= First
(Renaming_List
);
5359 while Present
(Renaming_Decl
) loop
5360 if Nkind
(Renaming_Decl
) = N_Subprogram_Renaming_Declaration
5362 Chars
(Defining_Entity
(Renaming_Decl
)) = Chars
(Gen_Unit
)
5367 Next
(Renaming_Decl
);
5370 if No
(Renaming_Decl
) then
5371 Append
(Unit_Renaming
, Renaming_List
);
5373 end Build_Subprogram_Renaming
;
5377 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5378 Saved_ISMP
: constant Boolean :=
5379 Ignore_SPARK_Mode_Pragmas_In_Instance
;
5380 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5381 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5382 -- Save the Ghost and SPARK mode-related data to restore on exit
5384 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5385 -- List of primitives made temporarily visible in the instantiation
5386 -- to match the visibility of the formal type
5388 -- Start of processing for Analyze_Subprogram_Instantiation
5391 -- Preserve relevant elaboration-related attributes of the context which
5392 -- are no longer available or very expensive to recompute once analysis,
5393 -- resolution, and expansion are over.
5395 Mark_Elaboration_Attributes
5401 Check_SPARK_05_Restriction
("generic is not allowed", N
);
5403 -- Very first thing: check for special Text_IO unit in case we are
5404 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5405 -- such an instantiation is bogus (these are packages, not subprograms),
5406 -- but we get a better error message if we do this.
5408 Check_Text_IO_Special_Unit
(Gen_Id
);
5410 -- Make node global for error reporting
5412 Instantiation_Node
:= N
;
5414 -- For package instantiations we turn off style checks, because they
5415 -- will have been emitted in the generic. For subprogram instantiations
5416 -- we want to apply at least the check on overriding indicators so we
5417 -- do not modify the style check status.
5419 -- The renaming declarations for the actuals do not come from source and
5420 -- will not generate spurious warnings.
5422 Preanalyze_Actuals
(N
);
5425 Env_Installed
:= True;
5426 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5427 Gen_Unit
:= Entity
(Gen_Id
);
5429 -- A subprogram instantiation is Ghost when it is subject to pragma
5430 -- Ghost or the generic template is Ghost. Set the mode now to ensure
5431 -- that any nodes generated during analysis and expansion are marked as
5434 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
5436 Generate_Reference
(Gen_Unit
, Gen_Id
);
5438 if Nkind
(Gen_Id
) = N_Identifier
5439 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5442 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5445 if Etype
(Gen_Unit
) = Any_Type
then
5450 -- Verify that it is a generic subprogram of the right kind, and that
5451 -- it does not lead to a circular instantiation.
5453 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5455 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5457 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5459 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5461 elsif In_Open_Scopes
(Gen_Unit
) then
5462 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5465 Set_Entity
(Gen_Id
, Gen_Unit
);
5466 Set_Is_Instantiated
(Gen_Unit
);
5468 if In_Extended_Main_Source_Unit
(N
) then
5469 Generate_Reference
(Gen_Unit
, N
);
5472 -- If renaming, get original unit
5474 if Present
(Renamed_Object
(Gen_Unit
))
5475 and then Ekind_In
(Renamed_Object
(Gen_Unit
), E_Generic_Procedure
,
5478 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
5479 Set_Is_Instantiated
(Gen_Unit
);
5480 Generate_Reference
(Gen_Unit
, N
);
5483 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5484 Error_Msg_Node_2
:= Current_Scope
;
5486 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
5487 Circularity_Detected
:= True;
5488 Restore_Hidden_Primitives
(Vis_Prims_List
);
5492 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5494 -- Initialize renamings map, for error checking
5496 Generic_Renamings
.Set_Last
(0);
5497 Generic_Renamings_HTable
.Reset
;
5499 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
5501 -- Copy original generic tree, to produce text for instantiation
5505 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5507 -- Inherit overriding indicator from instance node
5509 Act_Spec
:= Specification
(Act_Tree
);
5510 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5511 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5514 Analyze_Associations
5516 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5517 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5519 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5521 -- The subprogram itself cannot contain a nested instance, so the
5522 -- current parent is left empty.
5524 Set_Instance_Env
(Gen_Unit
, Empty
);
5526 -- Build the subprogram declaration, which does not appear in the
5527 -- generic template, and give it a sloc consistent with that of the
5530 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5531 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5533 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5534 Specification
=> Act_Spec
);
5536 -- The aspects have been copied previously, but they have to be
5537 -- linked explicitly to the new subprogram declaration. Explicit
5538 -- pre/postconditions on the instance are analyzed below, in a
5541 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5542 Set_Categorization_From_Pragmas
(Act_Decl
);
5544 if Parent_Installed
then
5548 Append
(Act_Decl
, Renaming_List
);
5550 -- Contract-related source pragmas that follow a generic subprogram
5551 -- must be instantiated explicitly because they are not part of the
5552 -- subprogram template.
5554 Instantiate_Subprogram_Contract
5555 (Original_Node
(Gen_Decl
), Renaming_List
);
5557 Build_Subprogram_Renaming
;
5559 -- If the context of the instance is subject to SPARK_Mode "off" or
5560 -- the annotation is altogether missing, set the global flag which
5561 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5562 -- the instance. This should be done prior to analyzing the instance.
5564 if SPARK_Mode
/= On
then
5565 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
5568 -- If the context of an instance is not subject to SPARK_Mode "off",
5569 -- and the generic spec is subject to an explicit SPARK_Mode pragma,
5570 -- the latter should be the one applicable to the instance.
5572 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5573 and then Saved_SM
/= Off
5574 and then Present
(SPARK_Pragma
(Gen_Unit
))
5576 Set_SPARK_Mode
(Gen_Unit
);
5579 Analyze_Instance_And_Renamings
;
5581 -- Restore SPARK_Mode from the context after analysis of the package
5582 -- declaration, so that the SPARK_Mode on the generic spec does not
5583 -- apply to the pending instance for the instance body.
5585 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5586 and then Saved_SM
/= Off
5587 and then Present
(SPARK_Pragma
(Gen_Unit
))
5589 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5592 -- If the generic is marked Import (Intrinsic), then so is the
5593 -- instance. This indicates that there is no body to instantiate. If
5594 -- generic is marked inline, so it the instance, and the anonymous
5595 -- subprogram it renames. If inlined, or else if inlining is enabled
5596 -- for the compilation, we generate the instance body even if it is
5597 -- not within the main unit.
5599 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5600 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5601 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5603 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5604 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5608 -- Inherit convention from generic unit. Intrinsic convention, as for
5609 -- an instance of unchecked conversion, is not inherited because an
5610 -- explicit Ada instance has been created.
5612 if Has_Convention_Pragma
(Gen_Unit
)
5613 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5615 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5616 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5619 Generate_Definition
(Act_Decl_Id
);
5621 -- Inherit all inlining-related flags which apply to the generic in
5622 -- the subprogram and its declaration.
5624 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5625 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5627 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5628 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5630 -- Propagate No_Return if pragma applied to generic unit. This must
5631 -- be done explicitly because pragma does not appear in generic
5632 -- declaration (unlike the aspect case).
5634 if No_Return
(Gen_Unit
) then
5635 Set_No_Return
(Act_Decl_Id
);
5636 Set_No_Return
(Anon_Id
);
5639 Set_Has_Pragma_Inline_Always
5640 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5641 Set_Has_Pragma_Inline_Always
5642 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5644 -- Mark both the instance spec and the anonymous package in case the
5645 -- body is instantiated at a later pass. This preserves the original
5646 -- context in effect for the body.
5648 if SPARK_Mode
/= On
then
5649 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
5650 Set_Ignore_SPARK_Mode_Pragmas
(Anon_Id
);
5653 -- Save the scenario for later examination by the ABE Processing
5656 Record_Elaboration_Scenario
(N
);
5658 -- The instantiation results in a guaranteed ABE. Create a completing
5659 -- body for the subprogram declaration because the real body will not
5662 if Is_Known_Guaranteed_ABE
(N
) then
5663 Provide_Completing_Bodies
(Instance_Spec
(N
));
5666 if Is_Dispatching_Operation
(Act_Decl_Id
)
5667 and then Ada_Version
>= Ada_2005
5673 Formal
:= First_Formal
(Act_Decl_Id
);
5674 while Present
(Formal
) loop
5675 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
5676 and then Is_Controlling_Formal
(Formal
)
5677 and then not Can_Never_Be_Null
(Formal
)
5680 ("access parameter& is controlling,", N
, Formal
);
5682 ("\corresponding parameter of & must be explicitly "
5683 & "null-excluding", N
, Gen_Id
);
5686 Next_Formal
(Formal
);
5691 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
5693 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5695 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
5696 Inherit_Context
(Gen_Decl
, N
);
5698 Restore_Private_Views
(Pack_Id
, False);
5700 -- If the context requires a full instantiation, mark node for
5701 -- subsequent construction of the body.
5703 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
5704 Check_Forward_Instantiation
(Gen_Decl
);
5706 -- The wrapper package is always delayed, because it does not
5707 -- constitute a freeze point, but to insure that the freeze node
5708 -- is placed properly, it is created directly when instantiating
5709 -- the body (otherwise the freeze node might appear to early for
5710 -- nested instantiations). For ASIS purposes, indicate that the
5711 -- wrapper package has replaced the instantiation node.
5713 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5714 Rewrite
(N
, Unit
(Parent
(N
)));
5715 Set_Unit
(Parent
(N
), N
);
5718 -- Replace instance node for library-level instantiations of
5719 -- intrinsic subprograms, for ASIS use.
5721 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5722 Rewrite
(N
, Unit
(Parent
(N
)));
5723 Set_Unit
(Parent
(N
), N
);
5726 if Parent_Installed
then
5730 Restore_Hidden_Primitives
(Vis_Prims_List
);
5732 Env_Installed
:= False;
5733 Generic_Renamings
.Set_Last
(0);
5734 Generic_Renamings_HTable
.Reset
;
5738 -- Analyze aspects in declaration if no errors appear in the instance.
5740 if Has_Aspects
(N
) and then Serious_Errors_Detected
= Errs
then
5741 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5744 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5745 Restore_Ghost_Mode
(Saved_GM
);
5746 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5749 when Instantiation_Error
=>
5750 if Parent_Installed
then
5754 if Env_Installed
then
5758 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5759 Restore_Ghost_Mode
(Saved_GM
);
5760 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5761 end Analyze_Subprogram_Instantiation
;
5763 -------------------------
5764 -- Get_Associated_Node --
5765 -------------------------
5767 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
5771 Assoc
:= Associated_Node
(N
);
5773 if Nkind
(Assoc
) /= Nkind
(N
) then
5776 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
5780 -- If the node is part of an inner generic, it may itself have been
5781 -- remapped into a further generic copy. Associated_Node is otherwise
5782 -- used for the entity of the node, and will be of a different node
5783 -- kind, or else N has been rewritten as a literal or function call.
5785 while Present
(Associated_Node
(Assoc
))
5786 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
5788 Assoc
:= Associated_Node
(Assoc
);
5791 -- Follow an additional link in case the final node was rewritten.
5792 -- This can only happen with nested generic units.
5794 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
5795 and then Present
(Associated_Node
(Assoc
))
5796 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
5797 N_Explicit_Dereference
,
5802 Assoc
:= Associated_Node
(Assoc
);
5805 -- An additional special case: an unconstrained type in an object
5806 -- declaration may have been rewritten as a local subtype constrained
5807 -- by the expression in the declaration. We need to recover the
5808 -- original entity, which may be global.
5810 if Present
(Original_Node
(Assoc
))
5811 and then Nkind
(Parent
(N
)) = N_Object_Declaration
5813 Assoc
:= Original_Node
(Assoc
);
5818 end Get_Associated_Node
;
5820 ----------------------------
5821 -- Build_Function_Wrapper --
5822 ----------------------------
5824 function Build_Function_Wrapper
5825 (Formal_Subp
: Entity_Id
;
5826 Actual_Subp
: Entity_Id
) return Node_Id
5828 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
5829 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
5832 Func_Name
: Node_Id
;
5834 Parm_Type
: Node_Id
;
5835 Profile
: List_Id
:= New_List
;
5842 Func_Name
:= New_Occurrence_Of
(Actual_Subp
, Loc
);
5844 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
5845 Set_Ekind
(Func
, E_Function
);
5846 Set_Is_Generic_Actual_Subprogram
(Func
);
5848 Actuals
:= New_List
;
5849 Profile
:= New_List
;
5851 Act_F
:= First_Formal
(Actual_Subp
);
5852 Form_F
:= First_Formal
(Formal_Subp
);
5853 while Present
(Form_F
) loop
5855 -- Create new formal for profile of wrapper, and add a reference
5856 -- to it in the list of actuals for the enclosing call. The name
5857 -- must be that of the formal in the formal subprogram, because
5858 -- calls to it in the generic body may use named associations.
5860 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
5863 New_Occurrence_Of
(Get_Instance_Of
(Etype
(Form_F
)), Loc
);
5866 Make_Parameter_Specification
(Loc
,
5867 Defining_Identifier
=> New_F
,
5868 Parameter_Type
=> Parm_Type
));
5870 Append_To
(Actuals
, New_Occurrence_Of
(New_F
, Loc
));
5871 Next_Formal
(Form_F
);
5873 if Present
(Act_F
) then
5874 Next_Formal
(Act_F
);
5879 Make_Function_Specification
(Loc
,
5880 Defining_Unit_Name
=> Func
,
5881 Parameter_Specifications
=> Profile
,
5882 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
5885 Make_Expression_Function
(Loc
,
5886 Specification
=> Spec
,
5888 Make_Function_Call
(Loc
,
5890 Parameter_Associations
=> Actuals
));
5893 end Build_Function_Wrapper
;
5895 ----------------------------
5896 -- Build_Operator_Wrapper --
5897 ----------------------------
5899 function Build_Operator_Wrapper
5900 (Formal_Subp
: Entity_Id
;
5901 Actual_Subp
: Entity_Id
) return Node_Id
5903 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
5904 Ret_Type
: constant Entity_Id
:=
5905 Get_Instance_Of
(Etype
(Formal_Subp
));
5906 Op_Type
: constant Entity_Id
:=
5907 Get_Instance_Of
(Etype
(First_Formal
(Formal_Subp
)));
5908 Is_Binary
: constant Boolean :=
5909 Present
(Next_Formal
(First_Formal
(Formal_Subp
)));
5912 Expr
: Node_Id
:= Empty
;
5920 Op_Name
:= Chars
(Actual_Subp
);
5922 -- Create entities for wrapper function and its formals
5924 F1
:= Make_Temporary
(Loc
, 'A');
5925 F2
:= Make_Temporary
(Loc
, 'B');
5926 L
:= New_Occurrence_Of
(F1
, Loc
);
5927 R
:= New_Occurrence_Of
(F2
, Loc
);
5929 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
5930 Set_Ekind
(Func
, E_Function
);
5931 Set_Is_Generic_Actual_Subprogram
(Func
);
5934 Make_Function_Specification
(Loc
,
5935 Defining_Unit_Name
=> Func
,
5936 Parameter_Specifications
=> New_List
(
5937 Make_Parameter_Specification
(Loc
,
5938 Defining_Identifier
=> F1
,
5939 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
))),
5940 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
5943 Append_To
(Parameter_Specifications
(Spec
),
5944 Make_Parameter_Specification
(Loc
,
5945 Defining_Identifier
=> F2
,
5946 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
)));
5949 -- Build expression as a function call, or as an operator node
5950 -- that corresponds to the name of the actual, starting with
5951 -- binary operators.
5953 if Op_Name
not in Any_Operator_Name
then
5955 Make_Function_Call
(Loc
,
5957 New_Occurrence_Of
(Actual_Subp
, Loc
),
5958 Parameter_Associations
=> New_List
(L
));
5961 Append_To
(Parameter_Associations
(Expr
), R
);
5966 elsif Is_Binary
then
5967 if Op_Name
= Name_Op_And
then
5968 Expr
:= Make_Op_And
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5969 elsif Op_Name
= Name_Op_Or
then
5970 Expr
:= Make_Op_Or
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5971 elsif Op_Name
= Name_Op_Xor
then
5972 Expr
:= Make_Op_Xor
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5973 elsif Op_Name
= Name_Op_Eq
then
5974 Expr
:= Make_Op_Eq
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5975 elsif Op_Name
= Name_Op_Ne
then
5976 Expr
:= Make_Op_Ne
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5977 elsif Op_Name
= Name_Op_Le
then
5978 Expr
:= Make_Op_Le
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5979 elsif Op_Name
= Name_Op_Gt
then
5980 Expr
:= Make_Op_Gt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5981 elsif Op_Name
= Name_Op_Ge
then
5982 Expr
:= Make_Op_Ge
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5983 elsif Op_Name
= Name_Op_Lt
then
5984 Expr
:= Make_Op_Lt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5985 elsif Op_Name
= Name_Op_Add
then
5986 Expr
:= Make_Op_Add
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5987 elsif Op_Name
= Name_Op_Subtract
then
5988 Expr
:= Make_Op_Subtract
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5989 elsif Op_Name
= Name_Op_Concat
then
5990 Expr
:= Make_Op_Concat
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5991 elsif Op_Name
= Name_Op_Multiply
then
5992 Expr
:= Make_Op_Multiply
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5993 elsif Op_Name
= Name_Op_Divide
then
5994 Expr
:= Make_Op_Divide
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5995 elsif Op_Name
= Name_Op_Mod
then
5996 Expr
:= Make_Op_Mod
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5997 elsif Op_Name
= Name_Op_Rem
then
5998 Expr
:= Make_Op_Rem
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
5999 elsif Op_Name
= Name_Op_Expon
then
6000 Expr
:= Make_Op_Expon
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6006 if Op_Name
= Name_Op_Add
then
6007 Expr
:= Make_Op_Plus
(Loc
, Right_Opnd
=> L
);
6008 elsif Op_Name
= Name_Op_Subtract
then
6009 Expr
:= Make_Op_Minus
(Loc
, Right_Opnd
=> L
);
6010 elsif Op_Name
= Name_Op_Abs
then
6011 Expr
:= Make_Op_Abs
(Loc
, Right_Opnd
=> L
);
6012 elsif Op_Name
= Name_Op_Not
then
6013 Expr
:= Make_Op_Not
(Loc
, Right_Opnd
=> L
);
6018 Make_Expression_Function
(Loc
,
6019 Specification
=> Spec
,
6020 Expression
=> Expr
);
6023 end Build_Operator_Wrapper
;
6025 -------------------------------------------
6026 -- Build_Instance_Compilation_Unit_Nodes --
6027 -------------------------------------------
6029 procedure Build_Instance_Compilation_Unit_Nodes
6034 Decl_Cunit
: Node_Id
;
6035 Body_Cunit
: Node_Id
;
6037 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
6038 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
6041 -- A new compilation unit node is built for the instance declaration
6044 Make_Compilation_Unit
(Sloc
(N
),
6045 Context_Items
=> Empty_List
,
6047 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
6049 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
6051 -- The new compilation unit is linked to its body, but both share the
6052 -- same file, so we do not set Body_Required on the new unit so as not
6053 -- to create a spurious dependency on a non-existent body in the ali.
6054 -- This simplifies CodePeer unit traversal.
6056 -- We use the original instantiation compilation unit as the resulting
6057 -- compilation unit of the instance, since this is the main unit.
6059 Rewrite
(N
, Act_Body
);
6061 -- Propagate the aspect specifications from the package body template to
6062 -- the instantiated version of the package body.
6064 if Has_Aspects
(Act_Body
) then
6065 Set_Aspect_Specifications
6066 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
6069 Body_Cunit
:= Parent
(N
);
6071 -- The two compilation unit nodes are linked by the Library_Unit field
6073 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
6074 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
6076 -- Preserve the private nature of the package if needed
6078 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
6080 -- If the instance is not the main unit, its context, categorization
6081 -- and elaboration entity are not relevant to the compilation.
6083 if Body_Cunit
/= Cunit
(Main_Unit
) then
6084 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
6088 -- The context clause items on the instantiation, which are now attached
6089 -- to the body compilation unit (since the body overwrote the original
6090 -- instantiation node), semantically belong on the spec, so copy them
6091 -- there. It's harmless to leave them on the body as well. In fact one
6092 -- could argue that they belong in both places.
6094 Citem
:= First
(Context_Items
(Body_Cunit
));
6095 while Present
(Citem
) loop
6096 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
6100 -- Propagate categorization flags on packages, so that they appear in
6101 -- the ali file for the spec of the unit.
6103 if Ekind
(New_Main
) = E_Package
then
6104 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
6105 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
6106 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
6107 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
6108 Set_Is_Remote_Call_Interface
6109 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
6112 -- Make entry in Units table, so that binder can generate call to
6113 -- elaboration procedure for body, if any.
6115 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
6116 Main_Unit_Entity
:= New_Main
;
6117 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
6119 -- Build elaboration entity, since the instance may certainly generate
6120 -- elaboration code requiring a flag for protection.
6122 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
6123 end Build_Instance_Compilation_Unit_Nodes
;
6125 -----------------------------
6126 -- Check_Access_Definition --
6127 -----------------------------
6129 procedure Check_Access_Definition
(N
: Node_Id
) is
6132 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
6134 end Check_Access_Definition
;
6136 -----------------------------------
6137 -- Check_Formal_Package_Instance --
6138 -----------------------------------
6140 -- If the formal has specific parameters, they must match those of the
6141 -- actual. Both of them are instances, and the renaming declarations for
6142 -- their formal parameters appear in the same order in both. The analyzed
6143 -- formal has been analyzed in the context of the current instance.
6145 procedure Check_Formal_Package_Instance
6146 (Formal_Pack
: Entity_Id
;
6147 Actual_Pack
: Entity_Id
)
6149 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
6150 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
6151 Prev_E1
: Entity_Id
;
6156 procedure Check_Mismatch
(B
: Boolean);
6157 -- Common error routine for mismatch between the parameters of the
6158 -- actual instance and those of the formal package.
6160 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
6161 -- The formal may come from a nested formal package, and the actual may
6162 -- have been constant-folded. To determine whether the two denote the
6163 -- same entity we may have to traverse several definitions to recover
6164 -- the ultimate entity that they refer to.
6166 function Same_Instantiated_Function
(E1
, E2
: Entity_Id
) return Boolean;
6167 -- The formal and the actual must be identical, but if both are
6168 -- given by attributes they end up renaming different generated bodies,
6169 -- and we must verify that the attributes themselves match.
6171 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
6172 -- Similarly, if the formal comes from a nested formal package, the
6173 -- actual may designate the formal through multiple renamings, which
6174 -- have to be followed to determine the original variable in question.
6176 --------------------
6177 -- Check_Mismatch --
6178 --------------------
6180 procedure Check_Mismatch
(B
: Boolean) is
6181 -- A Formal_Type_Declaration for a derived private type is rewritten
6182 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
6183 -- which is why we examine the original node.
6185 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(Parent
(E2
)));
6188 if Kind
= N_Formal_Type_Declaration
then
6191 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
6192 N_Formal_Package_Declaration
)
6193 or else Kind
in N_Formal_Subprogram_Declaration
6197 -- Ada 2012: If both formal and actual are incomplete types they
6200 elsif Is_Incomplete_Type
(E1
) and then Is_Incomplete_Type
(E2
) then
6205 ("actual for & in actual instance does not match formal",
6206 Parent
(Actual_Pack
), E1
);
6210 --------------------------------
6211 -- Same_Instantiated_Constant --
6212 --------------------------------
6214 function Same_Instantiated_Constant
6215 (E1
, E2
: Entity_Id
) return Boolean
6221 while Present
(Ent
) loop
6225 elsif Ekind
(Ent
) /= E_Constant
then
6228 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
6229 if Entity
(Constant_Value
(Ent
)) = E1
then
6232 Ent
:= Entity
(Constant_Value
(Ent
));
6235 -- The actual may be a constant that has been folded. Recover
6238 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
6239 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
6247 end Same_Instantiated_Constant
;
6249 --------------------------------
6250 -- Same_Instantiated_Function --
6251 --------------------------------
6253 function Same_Instantiated_Function
6254 (E1
, E2
: Entity_Id
) return Boolean
6258 if Alias
(E1
) = Alias
(E2
) then
6261 elsif Present
(Alias
(E2
)) then
6262 U1
:= Original_Node
(Unit_Declaration_Node
(E1
));
6263 U2
:= Original_Node
(Unit_Declaration_Node
(Alias
(E2
)));
6265 return Nkind
(U1
) = N_Subprogram_Renaming_Declaration
6266 and then Nkind
(Name
(U1
)) = N_Attribute_Reference
6268 and then Nkind
(U2
) = N_Subprogram_Renaming_Declaration
6269 and then Nkind
(Name
(U2
)) = N_Attribute_Reference
6272 Attribute_Name
(Name
(U1
)) = Attribute_Name
(Name
(U2
));
6276 end Same_Instantiated_Function
;
6278 --------------------------------
6279 -- Same_Instantiated_Variable --
6280 --------------------------------
6282 function Same_Instantiated_Variable
6283 (E1
, E2
: Entity_Id
) return Boolean
6285 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
6286 -- Follow chain of renamings to the ultimate ancestor
6288 ---------------------
6289 -- Original_Entity --
6290 ---------------------
6292 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
6297 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
6298 and then Present
(Renamed_Object
(Orig
))
6299 and then Is_Entity_Name
(Renamed_Object
(Orig
))
6301 Orig
:= Entity
(Renamed_Object
(Orig
));
6305 end Original_Entity
;
6307 -- Start of processing for Same_Instantiated_Variable
6310 return Ekind
(E1
) = Ekind
(E2
)
6311 and then Original_Entity
(E1
) = Original_Entity
(E2
);
6312 end Same_Instantiated_Variable
;
6314 -- Start of processing for Check_Formal_Package_Instance
6318 while Present
(E1
) and then Present
(E2
) loop
6319 exit when Ekind
(E1
) = E_Package
6320 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
6322 -- If the formal is the renaming of the formal package, this
6323 -- is the end of its formal part, which may occur before the
6324 -- end of the formal part in the actual in the presence of
6325 -- defaulted parameters in the formal package.
6327 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
6328 and then Renamed_Entity
(E2
) = Scope
(E2
);
6330 -- The analysis of the actual may generate additional internal
6331 -- entities. If the formal is defaulted, there is no corresponding
6332 -- analysis and the internal entities must be skipped, until we
6333 -- find corresponding entities again.
6335 if Comes_From_Source
(E2
)
6336 and then not Comes_From_Source
(E1
)
6337 and then Chars
(E1
) /= Chars
(E2
)
6339 while Present
(E1
) and then Chars
(E1
) /= Chars
(E2
) loop
6347 -- Entities may be declared without full declaration, such as
6348 -- itypes and predefined operators (concatenation for arrays, eg).
6349 -- Skip it and keep the formal entity to find a later match for it.
6351 elsif No
(Parent
(E2
)) and then Ekind
(E1
) /= Ekind
(E2
) then
6355 -- If the formal entity comes from a formal declaration, it was
6356 -- defaulted in the formal package, and no check is needed on it.
6358 elsif Nkind_In
(Original_Node
(Parent
(E2
)),
6359 N_Formal_Object_Declaration
,
6360 N_Formal_Type_Declaration
)
6362 -- If the formal is a tagged type the corresponding class-wide
6363 -- type has been generated as well, and it must be skipped.
6365 if Is_Type
(E2
) and then Is_Tagged_Type
(E2
) then
6371 -- Ditto for defaulted formal subprograms.
6373 elsif Is_Overloadable
(E1
)
6374 and then Nkind
(Unit_Declaration_Node
(E2
)) in
6375 N_Formal_Subprogram_Declaration
6379 elsif Is_Type
(E1
) then
6381 -- Subtypes must statically match. E1, E2 are the local entities
6382 -- that are subtypes of the actuals. Itypes generated for other
6383 -- parameters need not be checked, the check will be performed
6384 -- on the parameters themselves.
6386 -- If E2 is a formal type declaration, it is a defaulted parameter
6387 -- and needs no checking.
6389 if not Is_Itype
(E1
) and then not Is_Itype
(E2
) then
6392 or else Etype
(E1
) /= Etype
(E2
)
6393 or else not Subtypes_Statically_Match
(E1
, E2
));
6396 elsif Ekind
(E1
) = E_Constant
then
6398 -- IN parameters must denote the same static value, or the same
6399 -- constant, or the literal null.
6401 Expr1
:= Expression
(Parent
(E1
));
6403 if Ekind
(E2
) /= E_Constant
then
6404 Check_Mismatch
(True);
6407 Expr2
:= Expression
(Parent
(E2
));
6410 if Is_OK_Static_Expression
(Expr1
) then
6411 if not Is_OK_Static_Expression
(Expr2
) then
6412 Check_Mismatch
(True);
6414 elsif Is_Discrete_Type
(Etype
(E1
)) then
6416 V1
: constant Uint
:= Expr_Value
(Expr1
);
6417 V2
: constant Uint
:= Expr_Value
(Expr2
);
6419 Check_Mismatch
(V1
/= V2
);
6422 elsif Is_Real_Type
(Etype
(E1
)) then
6424 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
6425 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
6427 Check_Mismatch
(V1
/= V2
);
6430 elsif Is_String_Type
(Etype
(E1
))
6431 and then Nkind
(Expr1
) = N_String_Literal
6433 if Nkind
(Expr2
) /= N_String_Literal
then
6434 Check_Mismatch
(True);
6437 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
6441 elsif Is_Entity_Name
(Expr1
) then
6442 if Is_Entity_Name
(Expr2
) then
6443 if Entity
(Expr1
) = Entity
(Expr2
) then
6447 (not Same_Instantiated_Constant
6448 (Entity
(Expr1
), Entity
(Expr2
)));
6452 Check_Mismatch
(True);
6455 elsif Is_Entity_Name
(Original_Node
(Expr1
))
6456 and then Is_Entity_Name
(Expr2
)
6457 and then Same_Instantiated_Constant
6458 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
6462 elsif Nkind
(Expr1
) = N_Null
then
6463 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
6466 Check_Mismatch
(True);
6469 elsif Ekind
(E1
) = E_Variable
then
6470 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
6472 elsif Ekind
(E1
) = E_Package
then
6474 (Ekind
(E1
) /= Ekind
(E2
)
6475 or else (Present
(Renamed_Object
(E2
))
6476 and then Renamed_Object
(E1
) /=
6477 Renamed_Object
(E2
)));
6479 elsif Is_Overloadable
(E1
) then
6480 -- Verify that the actual subprograms match. Note that actuals
6481 -- that are attributes are rewritten as subprograms. If the
6482 -- subprogram in the formal package is defaulted, no check is
6483 -- needed. Note that this can only happen in Ada 2005 when the
6484 -- formal package can be partially parameterized.
6486 if Nkind
(Unit_Declaration_Node
(E1
)) =
6487 N_Subprogram_Renaming_Declaration
6488 and then From_Default
(Unit_Declaration_Node
(E1
))
6492 -- If the formal package has an "others" box association that
6493 -- covers this formal, there is no need for a check either.
6495 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
6496 N_Formal_Subprogram_Declaration
6497 and then Box_Present
(Unit_Declaration_Node
(E2
))
6501 -- No check needed if subprogram is a defaulted null procedure
6503 elsif No
(Alias
(E2
))
6504 and then Ekind
(E2
) = E_Procedure
6506 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
6510 -- Otherwise the actual in the formal and the actual in the
6511 -- instantiation of the formal must match, up to renamings.
6515 (Ekind
(E2
) /= Ekind
(E1
)
6516 or else not Same_Instantiated_Function
(E1
, E2
));
6520 raise Program_Error
;
6528 end Check_Formal_Package_Instance
;
6530 ---------------------------
6531 -- Check_Formal_Packages --
6532 ---------------------------
6534 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
6536 Formal_P
: Entity_Id
;
6537 Formal_Decl
: Node_Id
;
6540 -- Iterate through the declarations in the instance, looking for package
6541 -- renaming declarations that denote instances of formal packages. Stop
6542 -- when we find the renaming of the current package itself. The
6543 -- declaration for a formal package without a box is followed by an
6544 -- internal entity that repeats the instantiation.
6546 E
:= First_Entity
(P_Id
);
6547 while Present
(E
) loop
6548 if Ekind
(E
) = E_Package
then
6549 if Renamed_Object
(E
) = P_Id
then
6552 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6556 Formal_Decl
:= Parent
(Associated_Formal_Package
(E
));
6558 -- Nothing to check if the formal has a box or an others_clause
6559 -- (necessarily with a box).
6561 if Box_Present
(Formal_Decl
) then
6564 elsif Nkind
(First
(Generic_Associations
(Formal_Decl
))) =
6567 -- The internal validating package was generated but formal
6568 -- and instance are known to be compatible.
6570 Formal_P
:= Next_Entity
(E
);
6571 Remove
(Unit_Declaration_Node
(Formal_P
));
6574 Formal_P
:= Next_Entity
(E
);
6576 -- If the instance is within an enclosing instance body
6577 -- there is no need to verify the legality of current formal
6578 -- packages because they were legal in the generic body.
6579 -- This optimization may be applicable elsewhere, and it
6580 -- also removes spurious errors that may arise with
6581 -- on-the-fly inlining and confusion between private and
6584 if not In_Instance_Body
then
6585 Check_Formal_Package_Instance
(Formal_P
, E
);
6588 -- After checking, remove the internal validating package.
6589 -- It is only needed for semantic checks, and as it may
6590 -- contain generic formal declarations it should not reach
6593 Remove
(Unit_Declaration_Node
(Formal_P
));
6600 end Check_Formal_Packages
;
6602 ---------------------------------
6603 -- Check_Forward_Instantiation --
6604 ---------------------------------
6606 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
6608 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
6611 -- The instantiation appears before the generic body if we are in the
6612 -- scope of the unit containing the generic, either in its spec or in
6613 -- the package body, and before the generic body.
6615 if Ekind
(Gen_Comp
) = E_Package_Body
then
6616 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
6619 if In_Open_Scopes
(Gen_Comp
)
6620 and then No
(Corresponding_Body
(Decl
))
6625 and then not Is_Compilation_Unit
(S
)
6626 and then not Is_Child_Unit
(S
)
6628 if Ekind
(S
) = E_Package
then
6629 Set_Has_Forward_Instantiation
(S
);
6635 end Check_Forward_Instantiation
;
6637 ---------------------------
6638 -- Check_Generic_Actuals --
6639 ---------------------------
6641 -- The visibility of the actuals may be different between the point of
6642 -- generic instantiation and the instantiation of the body.
6644 procedure Check_Generic_Actuals
6645 (Instance
: Entity_Id
;
6646 Is_Formal_Box
: Boolean)
6651 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
6652 -- For a formal that is an array type, the component type is often a
6653 -- previous formal in the same unit. The privacy status of the component
6654 -- type will have been examined earlier in the traversal of the
6655 -- corresponding actuals, and this status should not be modified for
6656 -- the array (sub)type itself. However, if the base type of the array
6657 -- (sub)type is private, its full view must be restored in the body to
6658 -- be consistent with subsequent index subtypes, etc.
6660 -- To detect this case we have to rescan the list of formals, which is
6661 -- usually short enough to ignore the resulting inefficiency.
6663 -----------------------------
6664 -- Denotes_Previous_Actual --
6665 -----------------------------
6667 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
6671 Prev
:= First_Entity
(Instance
);
6672 while Present
(Prev
) loop
6674 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
6675 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
6676 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
6689 end Denotes_Previous_Actual
;
6691 -- Start of processing for Check_Generic_Actuals
6694 E
:= First_Entity
(Instance
);
6695 while Present
(E
) loop
6697 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
6698 and then Scope
(Etype
(E
)) /= Instance
6699 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
6701 if Is_Array_Type
(E
)
6702 and then not Is_Private_Type
(Etype
(E
))
6703 and then Denotes_Previous_Actual
(Component_Type
(E
))
6707 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
6710 Set_Is_Generic_Actual_Type
(E
, True);
6711 Set_Is_Hidden
(E
, False);
6712 Set_Is_Potentially_Use_Visible
(E
, In_Use
(Instance
));
6714 -- We constructed the generic actual type as a subtype of the
6715 -- supplied type. This means that it normally would not inherit
6716 -- subtype specific attributes of the actual, which is wrong for
6717 -- the generic case.
6719 Astype
:= Ancestor_Subtype
(E
);
6723 -- This can happen when E is an itype that is the full view of
6724 -- a private type completed, e.g. with a constrained array. In
6725 -- that case, use the first subtype, which will carry size
6726 -- information. The base type itself is unconstrained and will
6729 Astype
:= First_Subtype
(E
);
6732 Set_Size_Info
(E
, (Astype
));
6733 Set_RM_Size
(E
, RM_Size
(Astype
));
6734 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
6736 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
6737 Set_RM_Size
(E
, RM_Size
(Astype
));
6739 -- In nested instances, the base type of an access actual may
6740 -- itself be private, and need to be exchanged.
6742 elsif Is_Access_Type
(E
)
6743 and then Is_Private_Type
(Etype
(E
))
6746 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
6749 elsif Ekind
(E
) = E_Package
then
6751 -- If this is the renaming for the current instance, we're done.
6752 -- Otherwise it is a formal package. If the corresponding formal
6753 -- was declared with a box, the (instantiations of the) generic
6754 -- formal part are also visible. Otherwise, ignore the entity
6755 -- created to validate the actuals.
6757 if Renamed_Object
(E
) = Instance
then
6760 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6763 -- The visibility of a formal of an enclosing generic is already
6766 elsif Denotes_Formal_Package
(E
) then
6769 elsif Present
(Associated_Formal_Package
(E
))
6770 and then not Is_Generic_Formal
(E
)
6772 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
6773 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6776 Check_Generic_Actuals
(Renamed_Object
(E
), False);
6779 Set_Is_Hidden
(E
, False);
6782 -- If this is a subprogram instance (in a wrapper package) the
6783 -- actual is fully visible.
6785 elsif Is_Wrapper_Package
(Instance
) then
6786 Set_Is_Hidden
(E
, False);
6788 -- If the formal package is declared with a box, or if the formal
6789 -- parameter is defaulted, it is visible in the body.
6791 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
6792 Set_Is_Hidden
(E
, False);
6795 if Ekind
(E
) = E_Constant
then
6797 -- If the type of the actual is a private type declared in the
6798 -- enclosing scope of the generic unit, the body of the generic
6799 -- sees the full view of the type (because it has to appear in
6800 -- the corresponding package body). If the type is private now,
6801 -- exchange views to restore the proper visiblity in the instance.
6804 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
6805 -- The type of the actual
6810 Parent_Scope
: Entity_Id
;
6811 -- The enclosing scope of the generic unit
6814 if Is_Wrapper_Package
(Instance
) then
6818 (Unit_Declaration_Node
6819 (Related_Instance
(Instance
))));
6822 Generic_Parent
(Package_Specification
(Instance
));
6825 Parent_Scope
:= Scope
(Gen_Id
);
6827 -- The exchange is only needed if the generic is defined
6828 -- within a package which is not a common ancestor of the
6829 -- scope of the instance, and is not already in scope.
6831 if Is_Private_Type
(Typ
)
6832 and then Scope
(Typ
) = Parent_Scope
6833 and then Scope
(Instance
) /= Parent_Scope
6834 and then Ekind
(Parent_Scope
) = E_Package
6835 and then not Is_Child_Unit
(Gen_Id
)
6839 -- If the type of the entity is a subtype, it may also have
6840 -- to be made visible, together with the base type of its
6841 -- full view, after exchange.
6843 if Is_Private_Type
(Etype
(E
)) then
6844 Switch_View
(Etype
(E
));
6845 Switch_View
(Base_Type
(Etype
(E
)));
6853 end Check_Generic_Actuals
;
6855 ------------------------------
6856 -- Check_Generic_Child_Unit --
6857 ------------------------------
6859 procedure Check_Generic_Child_Unit
6861 Parent_Installed
: in out Boolean)
6863 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
6864 Gen_Par
: Entity_Id
:= Empty
;
6866 Inst_Par
: Entity_Id
;
6869 function Find_Generic_Child
6871 Id
: Node_Id
) return Entity_Id
;
6872 -- Search generic parent for possible child unit with the given name
6874 function In_Enclosing_Instance
return Boolean;
6875 -- Within an instance of the parent, the child unit may be denoted by
6876 -- a simple name, or an abbreviated expanded name. Examine enclosing
6877 -- scopes to locate a possible parent instantiation.
6879 ------------------------
6880 -- Find_Generic_Child --
6881 ------------------------
6883 function Find_Generic_Child
6885 Id
: Node_Id
) return Entity_Id
6890 -- If entity of name is already set, instance has already been
6891 -- resolved, e.g. in an enclosing instantiation.
6893 if Present
(Entity
(Id
)) then
6894 if Scope
(Entity
(Id
)) = Scop
then
6901 E
:= First_Entity
(Scop
);
6902 while Present
(E
) loop
6903 if Chars
(E
) = Chars
(Id
)
6904 and then Is_Child_Unit
(E
)
6906 if Is_Child_Unit
(E
)
6907 and then not Is_Visible_Lib_Unit
(E
)
6910 ("generic child unit& is not visible", Gen_Id
, E
);
6922 end Find_Generic_Child
;
6924 ---------------------------
6925 -- In_Enclosing_Instance --
6926 ---------------------------
6928 function In_Enclosing_Instance
return Boolean is
6929 Enclosing_Instance
: Node_Id
;
6930 Instance_Decl
: Node_Id
;
6933 -- We do not inline any call that contains instantiations, except
6934 -- for instantiations of Unchecked_Conversion, so if we are within
6935 -- an inlined body the current instance does not require parents.
6937 if In_Inlined_Body
then
6938 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
6942 -- Loop to check enclosing scopes
6944 Enclosing_Instance
:= Current_Scope
;
6945 while Present
(Enclosing_Instance
) loop
6946 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
6948 if Ekind
(Enclosing_Instance
) = E_Package
6949 and then Is_Generic_Instance
(Enclosing_Instance
)
6951 (Generic_Parent
(Specification
(Instance_Decl
)))
6953 -- Check whether the generic we are looking for is a child of
6956 E
:= Find_Generic_Child
6957 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
6958 exit when Present
(E
);
6964 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
6976 Make_Expanded_Name
(Loc
,
6978 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
6979 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
6981 Set_Entity
(Gen_Id
, E
);
6982 Set_Etype
(Gen_Id
, Etype
(E
));
6983 Parent_Installed
:= False; -- Already in scope.
6986 end In_Enclosing_Instance
;
6988 -- Start of processing for Check_Generic_Child_Unit
6991 -- If the name of the generic is given by a selected component, it may
6992 -- be the name of a generic child unit, and the prefix is the name of an
6993 -- instance of the parent, in which case the child unit must be visible.
6994 -- If this instance is not in scope, it must be placed there and removed
6995 -- after instantiation, because what is being instantiated is not the
6996 -- original child, but the corresponding child present in the instance
6999 -- If the child is instantiated within the parent, it can be given by
7000 -- a simple name. In this case the instance is already in scope, but
7001 -- the child generic must be recovered from the generic parent as well.
7003 if Nkind
(Gen_Id
) = N_Selected_Component
then
7004 S
:= Selector_Name
(Gen_Id
);
7005 Analyze
(Prefix
(Gen_Id
));
7006 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7008 if Ekind
(Inst_Par
) = E_Package
7009 and then Present
(Renamed_Object
(Inst_Par
))
7011 Inst_Par
:= Renamed_Object
(Inst_Par
);
7014 if Ekind
(Inst_Par
) = E_Package
then
7015 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
7016 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
7018 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
7020 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
7022 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
7025 elsif Ekind
(Inst_Par
) = E_Generic_Package
7026 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
7028 -- A formal package may be a real child package, and not the
7029 -- implicit instance within a parent. In this case the child is
7030 -- not visible and has to be retrieved explicitly as well.
7032 Gen_Par
:= Inst_Par
;
7035 if Present
(Gen_Par
) then
7037 -- The prefix denotes an instantiation. The entity itself may be a
7038 -- nested generic, or a child unit.
7040 E
:= Find_Generic_Child
(Gen_Par
, S
);
7043 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
7044 Set_Entity
(Gen_Id
, E
);
7045 Set_Etype
(Gen_Id
, Etype
(E
));
7047 Set_Etype
(S
, Etype
(E
));
7049 -- Indicate that this is a reference to the parent
7051 if In_Extended_Main_Source_Unit
(Gen_Id
) then
7052 Set_Is_Instantiated
(Inst_Par
);
7055 -- A common mistake is to replicate the naming scheme of a
7056 -- hierarchy by instantiating a generic child directly, rather
7057 -- than the implicit child in a parent instance:
7059 -- generic .. package Gpar is ..
7060 -- generic .. package Gpar.Child is ..
7061 -- package Par is new Gpar ();
7064 -- package Par.Child is new Gpar.Child ();
7065 -- rather than Par.Child
7067 -- In this case the instantiation is within Par, which is an
7068 -- instance, but Gpar does not denote Par because we are not IN
7069 -- the instance of Gpar, so this is illegal. The test below
7070 -- recognizes this particular case.
7072 if Is_Child_Unit
(E
)
7073 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
7074 and then (not In_Instance
7075 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
7079 ("prefix of generic child unit must be instance of parent",
7083 if not In_Open_Scopes
(Inst_Par
)
7084 and then Nkind
(Parent
(Gen_Id
)) not in
7085 N_Generic_Renaming_Declaration
7087 Install_Parent
(Inst_Par
);
7088 Parent_Installed
:= True;
7090 elsif In_Open_Scopes
(Inst_Par
) then
7092 -- If the parent is already installed, install the actuals
7093 -- for its formal packages. This is necessary when the child
7094 -- instance is a child of the parent instance: in this case,
7095 -- the parent is placed on the scope stack but the formal
7096 -- packages are not made visible.
7098 Install_Formal_Packages
(Inst_Par
);
7102 -- If the generic parent does not contain an entity that
7103 -- corresponds to the selector, the instance doesn't either.
7104 -- Analyzing the node will yield the appropriate error message.
7105 -- If the entity is not a child unit, then it is an inner
7106 -- generic in the parent.
7114 if Is_Child_Unit
(Entity
(Gen_Id
))
7116 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7117 and then not In_Open_Scopes
(Inst_Par
)
7119 Install_Parent
(Inst_Par
);
7120 Parent_Installed
:= True;
7122 -- The generic unit may be the renaming of the implicit child
7123 -- present in an instance. In that case the parent instance is
7124 -- obtained from the name of the renamed entity.
7126 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
7127 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7128 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7131 Renamed_Package
: constant Node_Id
:=
7132 Name
(Parent
(Entity
(Gen_Id
)));
7134 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
7135 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
7136 Install_Parent
(Inst_Par
);
7137 Parent_Installed
:= True;
7143 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
7145 -- Entity already present, analyze prefix, whose meaning may be an
7146 -- instance in the current context. If it is an instance of a
7147 -- relative within another, the proper parent may still have to be
7148 -- installed, if they are not of the same generation.
7150 Analyze
(Prefix
(Gen_Id
));
7152 -- Prevent cascaded errors
7154 if Etype
(Prefix
(Gen_Id
)) = Any_Type
then
7158 -- In the unlikely case that a local declaration hides the name of
7159 -- the parent package, locate it on the homonym chain. If the context
7160 -- is an instance of the parent, the renaming entity is flagged as
7163 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7164 while Present
(Inst_Par
)
7165 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
7167 Inst_Par
:= Homonym
(Inst_Par
);
7170 pragma Assert
(Present
(Inst_Par
));
7171 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
7173 if In_Enclosing_Instance
then
7176 elsif Present
(Entity
(Gen_Id
))
7177 and then Is_Child_Unit
(Entity
(Gen_Id
))
7178 and then not In_Open_Scopes
(Inst_Par
)
7180 Install_Parent
(Inst_Par
);
7181 Parent_Installed
:= True;
7184 elsif In_Enclosing_Instance
then
7186 -- The child unit is found in some enclosing scope
7193 -- If this is the renaming of the implicit child in a parent
7194 -- instance, recover the parent name and install it.
7196 if Is_Entity_Name
(Gen_Id
) then
7197 E
:= Entity
(Gen_Id
);
7199 if Is_Generic_Unit
(E
)
7200 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
7201 and then Is_Child_Unit
(Renamed_Object
(E
))
7202 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
7203 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
7205 Rewrite
(Gen_Id
, New_Copy_Tree
(Name
(Parent
(E
))));
7206 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7208 if not In_Open_Scopes
(Inst_Par
) then
7209 Install_Parent
(Inst_Par
);
7210 Parent_Installed
:= True;
7213 -- If it is a child unit of a non-generic parent, it may be
7214 -- use-visible and given by a direct name. Install parent as
7217 elsif Is_Generic_Unit
(E
)
7218 and then Is_Child_Unit
(E
)
7220 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7221 and then not Is_Generic_Unit
(Scope
(E
))
7223 if not In_Open_Scopes
(Scope
(E
)) then
7224 Install_Parent
(Scope
(E
));
7225 Parent_Installed
:= True;
7230 end Check_Generic_Child_Unit
;
7232 -----------------------------
7233 -- Check_Hidden_Child_Unit --
7234 -----------------------------
7236 procedure Check_Hidden_Child_Unit
7238 Gen_Unit
: Entity_Id
;
7239 Act_Decl_Id
: Entity_Id
)
7241 Gen_Id
: constant Node_Id
:= Name
(N
);
7244 if Is_Child_Unit
(Gen_Unit
)
7245 and then Is_Child_Unit
(Act_Decl_Id
)
7246 and then Nkind
(Gen_Id
) = N_Expanded_Name
7247 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
7248 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
7250 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
7252 ("generic unit & is implicitly declared in &",
7253 Defining_Unit_Name
(N
), Gen_Unit
);
7254 Error_Msg_N
("\instance must have different name",
7255 Defining_Unit_Name
(N
));
7257 end Check_Hidden_Child_Unit
;
7259 ------------------------
7260 -- Check_Private_View --
7261 ------------------------
7263 procedure Check_Private_View
(N
: Node_Id
) is
7264 T
: constant Entity_Id
:= Etype
(N
);
7268 -- Exchange views if the type was not private in the generic but is
7269 -- private at the point of instantiation. Do not exchange views if
7270 -- the scope of the type is in scope. This can happen if both generic
7271 -- and instance are sibling units, or if type is defined in a parent.
7272 -- In this case the visibility of the type will be correct for all
7276 BT
:= Base_Type
(T
);
7278 if Is_Private_Type
(T
)
7279 and then not Has_Private_View
(N
)
7280 and then Present
(Full_View
(T
))
7281 and then not In_Open_Scopes
(Scope
(T
))
7283 -- In the generic, the full type was visible. Save the private
7284 -- entity, for subsequent exchange.
7288 elsif Has_Private_View
(N
)
7289 and then not Is_Private_Type
(T
)
7290 and then not Has_Been_Exchanged
(T
)
7291 and then Etype
(Get_Associated_Node
(N
)) /= T
7293 -- Only the private declaration was visible in the generic. If
7294 -- the type appears in a subtype declaration, the subtype in the
7295 -- instance must have a view compatible with that of its parent,
7296 -- which must be exchanged (see corresponding code in Restore_
7297 -- Private_Views). Otherwise, if the type is defined in a parent
7298 -- unit, leave full visibility within instance, which is safe.
7300 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
7301 and then not Is_Private_Type
(Base_Type
(T
))
7302 and then Comes_From_Source
(Base_Type
(T
))
7306 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
7307 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
7309 Prepend_Elmt
(T
, Exchanged_Views
);
7310 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
7313 -- For composite types with inconsistent representation exchange
7314 -- component types accordingly.
7316 elsif Is_Access_Type
(T
)
7317 and then Is_Private_Type
(Designated_Type
(T
))
7318 and then not Has_Private_View
(N
)
7319 and then Present
(Full_View
(Designated_Type
(T
)))
7321 Switch_View
(Designated_Type
(T
));
7323 elsif Is_Array_Type
(T
) then
7324 if Is_Private_Type
(Component_Type
(T
))
7325 and then not Has_Private_View
(N
)
7326 and then Present
(Full_View
(Component_Type
(T
)))
7328 Switch_View
(Component_Type
(T
));
7331 -- The normal exchange mechanism relies on the setting of a
7332 -- flag on the reference in the generic. However, an additional
7333 -- mechanism is needed for types that are not explicitly
7334 -- mentioned in the generic, but may be needed in expanded code
7335 -- in the instance. This includes component types of arrays and
7336 -- designated types of access types. This processing must also
7337 -- include the index types of arrays which we take care of here.
7344 Indx
:= First_Index
(T
);
7345 while Present
(Indx
) loop
7346 Typ
:= Base_Type
(Etype
(Indx
));
7348 if Is_Private_Type
(Typ
)
7349 and then Present
(Full_View
(Typ
))
7358 elsif Is_Private_Type
(T
)
7359 and then Present
(Full_View
(T
))
7360 and then Is_Array_Type
(Full_View
(T
))
7361 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
7365 -- Finally, a non-private subtype may have a private base type, which
7366 -- must be exchanged for consistency. This can happen when a package
7367 -- body is instantiated, when the scope stack is empty but in fact
7368 -- the subtype and the base type are declared in an enclosing scope.
7370 -- Note that in this case we introduce an inconsistency in the view
7371 -- set, because we switch the base type BT, but there could be some
7372 -- private dependent subtypes of BT which remain unswitched. Such
7373 -- subtypes might need to be switched at a later point (see specific
7374 -- provision for that case in Switch_View).
7376 elsif not Is_Private_Type
(T
)
7377 and then not Has_Private_View
(N
)
7378 and then Is_Private_Type
(BT
)
7379 and then Present
(Full_View
(BT
))
7380 and then not Is_Generic_Type
(BT
)
7381 and then not In_Open_Scopes
(BT
)
7383 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
7384 Exchange_Declarations
(BT
);
7387 end Check_Private_View
;
7389 -----------------------------
7390 -- Check_Hidden_Primitives --
7391 -----------------------------
7393 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
7396 Result
: Elist_Id
:= No_Elist
;
7399 if No
(Assoc_List
) then
7403 -- Traverse the list of associations between formals and actuals
7404 -- searching for renamings of tagged types
7406 Actual
:= First
(Assoc_List
);
7407 while Present
(Actual
) loop
7408 if Nkind
(Actual
) = N_Subtype_Declaration
then
7409 Gen_T
:= Generic_Parent_Type
(Actual
);
7411 if Present
(Gen_T
) and then Is_Tagged_Type
(Gen_T
) then
7413 -- Traverse the list of primitives of the actual types
7414 -- searching for hidden primitives that are visible in the
7415 -- corresponding generic formal; leave them visible and
7416 -- append them to Result to restore their decoration later.
7418 Install_Hidden_Primitives
7419 (Prims_List
=> Result
,
7421 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
7429 end Check_Hidden_Primitives
;
7431 --------------------------
7432 -- Contains_Instance_Of --
7433 --------------------------
7435 function Contains_Instance_Of
7438 N
: Node_Id
) return Boolean
7446 -- Verify that there are no circular instantiations. We check whether
7447 -- the unit contains an instance of the current scope or some enclosing
7448 -- scope (in case one of the instances appears in a subunit). Longer
7449 -- circularities involving subunits might seem too pathological to
7450 -- consider, but they were not too pathological for the authors of
7451 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7452 -- enclosing generic scopes as containing an instance.
7455 -- Within a generic subprogram body, the scope is not generic, to
7456 -- allow for recursive subprograms. Use the declaration to determine
7457 -- whether this is a generic unit.
7459 if Ekind
(Scop
) = E_Generic_Package
7460 or else (Is_Subprogram
(Scop
)
7461 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
7462 N_Generic_Subprogram_Declaration
)
7464 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
7466 while Present
(Elmt
) loop
7467 if Node
(Elmt
) = Scop
then
7468 Error_Msg_Node_2
:= Inner
;
7470 ("circular Instantiation: & instantiated within &!",
7474 elsif Node
(Elmt
) = Inner
then
7477 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
7478 Error_Msg_Node_2
:= Inner
;
7480 ("circular Instantiation: & instantiated within &!",
7488 -- Indicate that Inner is being instantiated within Scop
7490 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
7493 if Scop
= Standard_Standard
then
7496 Scop
:= Scope
(Scop
);
7501 end Contains_Instance_Of
;
7503 -----------------------
7504 -- Copy_Generic_Node --
7505 -----------------------
7507 function Copy_Generic_Node
7509 Parent_Id
: Node_Id
;
7510 Instantiating
: Boolean) return Node_Id
7515 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
7516 -- Check the given value of one of the Fields referenced by the current
7517 -- node to determine whether to copy it recursively. The field may hold
7518 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
7519 -- Char) in which case it need not be copied.
7521 procedure Copy_Descendants
;
7522 -- Common utility for various nodes
7524 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
7525 -- Make copy of element list
7527 function Copy_Generic_List
7529 Parent_Id
: Node_Id
) return List_Id
;
7530 -- Apply Copy_Node recursively to the members of a node list
7532 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
7533 -- True if an identifier is part of the defining program unit name of
7534 -- a child unit. The entity of such an identifier must be kept (for
7535 -- ASIS use) even though as the name of an enclosing generic it would
7536 -- otherwise not be preserved in the generic tree.
7538 ----------------------
7539 -- Copy_Descendants --
7540 ----------------------
7542 procedure Copy_Descendants
is
7543 use Atree
.Unchecked_Access
;
7544 -- This code section is part of the implementation of an untyped
7545 -- tree traversal, so it needs direct access to node fields.
7548 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
7549 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
7550 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
7551 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
7552 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
7553 end Copy_Descendants
;
7555 -----------------------------
7556 -- Copy_Generic_Descendant --
7557 -----------------------------
7559 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
7561 if D
= Union_Id
(Empty
) then
7564 elsif D
in Node_Range
then
7566 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
7568 elsif D
in List_Range
then
7569 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
7571 elsif D
in Elist_Range
then
7572 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
7574 -- Nothing else is copyable (e.g. Uint values), return as is
7579 end Copy_Generic_Descendant
;
7581 ------------------------
7582 -- Copy_Generic_Elist --
7583 ------------------------
7585 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
7592 M
:= First_Elmt
(E
);
7593 while Present
(M
) loop
7595 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
7604 end Copy_Generic_Elist
;
7606 -----------------------
7607 -- Copy_Generic_List --
7608 -----------------------
7610 function Copy_Generic_List
7612 Parent_Id
: Node_Id
) return List_Id
7620 Set_Parent
(New_L
, Parent_Id
);
7623 while Present
(N
) loop
7624 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
7633 end Copy_Generic_List
;
7635 ---------------------------
7636 -- In_Defining_Unit_Name --
7637 ---------------------------
7639 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
7642 Present
(Parent
(Nam
))
7643 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
7645 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
7646 and then In_Defining_Unit_Name
(Parent
(Nam
))));
7647 end In_Defining_Unit_Name
;
7649 -- Start of processing for Copy_Generic_Node
7656 New_N
:= New_Copy
(N
);
7658 -- Copy aspects if present
7660 if Has_Aspects
(N
) then
7661 Set_Has_Aspects
(New_N
, False);
7662 Set_Aspect_Specifications
7663 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
7666 -- If we are instantiating, we want to adjust the sloc based on the
7667 -- current S_Adjustment. However, if this is the root node of a subunit,
7668 -- we need to defer that adjustment to below (see "elsif Instantiating
7669 -- and Was_Stub"), so it comes after Create_Instantiation_Source has
7670 -- computed the adjustment.
7673 and then not (Nkind
(N
) in N_Proper_Body
7674 and then Was_Originally_Stub
(N
))
7676 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
7679 if not Is_List_Member
(N
) then
7680 Set_Parent
(New_N
, Parent_Id
);
7683 -- Special casing for identifiers and other entity names and operators
7685 if Nkind_In
(New_N
, N_Character_Literal
,
7689 or else Nkind
(New_N
) in N_Op
7691 if not Instantiating
then
7693 -- Link both nodes in order to assign subsequently the entity of
7694 -- the copy to the original node, in case this is a global
7697 Set_Associated_Node
(N
, New_N
);
7699 -- If we are within an instantiation, this is a nested generic
7700 -- that has already been analyzed at the point of definition.
7701 -- We must preserve references that were global to the enclosing
7702 -- parent at that point. Other occurrences, whether global or
7703 -- local to the current generic, must be resolved anew, so we
7704 -- reset the entity in the generic copy. A global reference has a
7705 -- smaller depth than the parent, or else the same depth in case
7706 -- both are distinct compilation units.
7708 -- A child unit is implicitly declared within the enclosing parent
7709 -- but is in fact global to it, and must be preserved.
7711 -- It is also possible for Current_Instantiated_Parent to be
7712 -- defined, and for this not to be a nested generic, namely if
7713 -- the unit is loaded through Rtsfind. In that case, the entity of
7714 -- New_N is only a link to the associated node, and not a defining
7717 -- The entities for parent units in the defining_program_unit of a
7718 -- generic child unit are established when the context of the unit
7719 -- is first analyzed, before the generic copy is made. They are
7720 -- preserved in the copy for use in ASIS queries.
7722 Ent
:= Entity
(New_N
);
7724 if No
(Current_Instantiated_Parent
.Gen_Id
) then
7726 or else Nkind
(Ent
) /= N_Defining_Identifier
7727 or else not In_Defining_Unit_Name
(N
)
7729 Set_Associated_Node
(New_N
, Empty
);
7734 not Nkind_In
(Ent
, N_Defining_Identifier
,
7735 N_Defining_Character_Literal
,
7736 N_Defining_Operator_Symbol
)
7737 or else No
(Scope
(Ent
))
7739 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
7740 and then not Is_Child_Unit
(Ent
))
7742 (Scope_Depth
(Scope
(Ent
)) >
7743 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
7745 Get_Source_Unit
(Ent
) =
7746 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
7748 Set_Associated_Node
(New_N
, Empty
);
7751 -- Case of instantiating identifier or some other name or operator
7754 -- If the associated node is still defined, the entity in it
7755 -- is global, and must be copied to the instance. If this copy
7756 -- is being made for a body to inline, it is applied to an
7757 -- instantiated tree, and the entity is already present and
7758 -- must be also preserved.
7761 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
7764 if Present
(Assoc
) then
7765 if Nkind
(Assoc
) = Nkind
(N
) then
7766 Set_Entity
(New_N
, Entity
(Assoc
));
7767 Check_Private_View
(N
);
7769 -- The node is a reference to a global type and acts as the
7770 -- subtype mark of a qualified expression created in order
7771 -- to aid resolution of accidental overloading in instances.
7772 -- Since N is a reference to a type, the Associated_Node of
7773 -- N denotes an entity rather than another identifier. See
7774 -- Qualify_Universal_Operands for details.
7776 elsif Nkind
(N
) = N_Identifier
7777 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
7778 and then Subtype_Mark
(Parent
(N
)) = N
7779 and then Is_Qualified_Universal_Literal
(Parent
(N
))
7781 Set_Entity
(New_N
, Assoc
);
7783 -- The name in the call may be a selected component if the
7784 -- call has not been analyzed yet, as may be the case for
7785 -- pre/post conditions in a generic unit.
7787 elsif Nkind
(Assoc
) = N_Function_Call
7788 and then Is_Entity_Name
(Name
(Assoc
))
7790 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
7792 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
7793 N_Defining_Character_Literal
,
7794 N_Defining_Operator_Symbol
)
7795 and then Expander_Active
7797 -- Inlining case: we are copying a tree that contains
7798 -- global entities, which are preserved in the copy to be
7799 -- used for subsequent inlining.
7804 Set_Entity
(New_N
, Empty
);
7810 -- For expanded name, we must copy the Prefix and Selector_Name
7812 if Nkind
(N
) = N_Expanded_Name
then
7814 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
7816 Set_Selector_Name
(New_N
,
7817 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
7819 -- For operators, copy the operands
7821 elsif Nkind
(N
) in N_Op
then
7822 if Nkind
(N
) in N_Binary_Op
then
7823 Set_Left_Opnd
(New_N
,
7824 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
7827 Set_Right_Opnd
(New_N
,
7828 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
7831 -- Establish a link between an entity from the generic template and the
7832 -- corresponding entity in the generic copy to be analyzed.
7834 elsif Nkind
(N
) in N_Entity
then
7835 if not Instantiating
then
7836 Set_Associated_Entity
(N
, New_N
);
7839 -- Clear any existing link the copy may inherit from the replicated
7840 -- generic template entity.
7842 Set_Associated_Entity
(New_N
, Empty
);
7844 -- Special casing for stubs
7846 elsif Nkind
(N
) in N_Body_Stub
then
7848 -- In any case, we must copy the specification or defining
7849 -- identifier as appropriate.
7851 if Nkind
(N
) = N_Subprogram_Body_Stub
then
7852 Set_Specification
(New_N
,
7853 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
7856 Set_Defining_Identifier
(New_N
,
7858 (Defining_Identifier
(N
), New_N
, Instantiating
));
7861 -- If we are not instantiating, then this is where we load and
7862 -- analyze subunits, i.e. at the point where the stub occurs. A
7863 -- more permissive system might defer this analysis to the point
7864 -- of instantiation, but this seems too complicated for now.
7866 if not Instantiating
then
7868 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
7870 Unum
: Unit_Number_Type
;
7874 -- Make sure that, if it is a subunit of the main unit that is
7875 -- preprocessed and if -gnateG is specified, the preprocessed
7876 -- file will be written.
7878 Lib
.Analysing_Subunit_Of_Main
:=
7879 Lib
.In_Extended_Main_Source_Unit
(N
);
7882 (Load_Name
=> Subunit_Name
,
7886 Lib
.Analysing_Subunit_Of_Main
:= False;
7888 -- If the proper body is not found, a warning message will be
7889 -- emitted when analyzing the stub, or later at the point of
7890 -- instantiation. Here we just leave the stub as is.
7892 if Unum
= No_Unit
then
7893 Subunits_Missing
:= True;
7894 goto Subunit_Not_Found
;
7897 Subunit
:= Cunit
(Unum
);
7899 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
7901 ("found child unit instead of expected SEPARATE subunit",
7903 Error_Msg_Sloc
:= Sloc
(N
);
7904 Error_Msg_N
("\to complete stub #", Subunit
);
7905 goto Subunit_Not_Found
;
7908 -- We must create a generic copy of the subunit, in order to
7909 -- perform semantic analysis on it, and we must replace the
7910 -- stub in the original generic unit with the subunit, in order
7911 -- to preserve non-local references within.
7913 -- Only the proper body needs to be copied. Library_Unit and
7914 -- context clause are simply inherited by the generic copy.
7915 -- Note that the copy (which may be recursive if there are
7916 -- nested subunits) must be done first, before attaching it to
7917 -- the enclosing generic.
7921 (Proper_Body
(Unit
(Subunit
)),
7922 Empty
, Instantiating
=> False);
7924 -- Now place the original proper body in the original generic
7925 -- unit. This is a body, not a compilation unit.
7927 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
7928 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
7929 Set_Was_Originally_Stub
(N
);
7931 -- Finally replace the body of the subunit with its copy, and
7932 -- make this new subunit into the library unit of the generic
7933 -- copy, which does not have stubs any longer.
7935 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
7936 Set_Library_Unit
(New_N
, Subunit
);
7937 Inherit_Context
(Unit
(Subunit
), N
);
7940 -- If we are instantiating, this must be an error case, since
7941 -- otherwise we would have replaced the stub node by the proper body
7942 -- that corresponds. So just ignore it in the copy (i.e. we have
7943 -- copied it, and that is good enough).
7949 <<Subunit_Not_Found
>> null;
7951 -- If the node is a compilation unit, it is the subunit of a stub, which
7952 -- has been loaded already (see code below). In this case, the library
7953 -- unit field of N points to the parent unit (which is a compilation
7954 -- unit) and need not (and cannot) be copied.
7956 -- When the proper body of the stub is analyzed, the library_unit link
7957 -- is used to establish the proper context (see sem_ch10).
7959 -- The other fields of a compilation unit are copied as usual
7961 elsif Nkind
(N
) = N_Compilation_Unit
then
7963 -- This code can only be executed when not instantiating, because in
7964 -- the copy made for an instantiation, the compilation unit node has
7965 -- disappeared at the point that a stub is replaced by its proper
7968 pragma Assert
(not Instantiating
);
7970 Set_Context_Items
(New_N
,
7971 Copy_Generic_List
(Context_Items
(N
), New_N
));
7974 Copy_Generic_Node
(Unit
(N
), New_N
, Instantiating
=> False));
7976 Set_First_Inlined_Subprogram
(New_N
,
7978 (First_Inlined_Subprogram
(N
), New_N
, Instantiating
=> False));
7983 (Aux_Decls_Node
(N
), New_N
, Instantiating
=> False));
7985 -- For an assignment node, the assignment is known to be semantically
7986 -- legal if we are instantiating the template. This avoids incorrect
7987 -- diagnostics in generated code.
7989 elsif Nkind
(N
) = N_Assignment_Statement
then
7991 -- Copy name and expression fields in usual manner
7994 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
7996 Set_Expression
(New_N
,
7997 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
7999 if Instantiating
then
8000 Set_Assignment_OK
(Name
(New_N
), True);
8003 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
8004 if not Instantiating
then
8005 Set_Associated_Node
(N
, New_N
);
8008 if Present
(Get_Associated_Node
(N
))
8009 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
8011 -- In the generic the aggregate has some composite type. If at
8012 -- the point of instantiation the type has a private view,
8013 -- install the full view (and that of its ancestors, if any).
8016 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
8020 if Present
(T
) and then Is_Private_Type
(T
) then
8025 and then Is_Tagged_Type
(T
)
8026 and then Is_Derived_Type
(T
)
8028 Rt
:= Root_Type
(T
);
8033 if Is_Private_Type
(T
) then
8044 -- Do not copy the associated node, which points to the generic copy
8045 -- of the aggregate.
8048 use Atree
.Unchecked_Access
;
8049 -- This code section is part of the implementation of an untyped
8050 -- tree traversal, so it needs direct access to node fields.
8053 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
8054 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
8055 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
8056 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
8059 -- Allocators do not have an identifier denoting the access type, so we
8060 -- must locate it through the expression to check whether the views are
8063 elsif Nkind
(N
) = N_Allocator
8064 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
8065 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
8066 and then Instantiating
8069 T
: constant Node_Id
:=
8070 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
8076 -- Retrieve the allocator node in the generic copy
8078 Acc_T
:= Etype
(Parent
(Parent
(T
)));
8080 if Present
(Acc_T
) and then Is_Private_Type
(Acc_T
) then
8081 Switch_View
(Acc_T
);
8088 -- For a proper body, we must catch the case of a proper body that
8089 -- replaces a stub. This represents the point at which a separate
8090 -- compilation unit, and hence template file, may be referenced, so we
8091 -- must make a new source instantiation entry for the template of the
8092 -- subunit, and ensure that all nodes in the subunit are adjusted using
8093 -- this new source instantiation entry.
8095 elsif Nkind
(N
) in N_Proper_Body
then
8097 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
8099 if Instantiating
and then Was_Originally_Stub
(N
) then
8100 Create_Instantiation_Source
8101 (Instantiation_Node
,
8102 Defining_Entity
(N
),
8105 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8108 -- Now copy the fields of the proper body, using the new
8109 -- adjustment factor if one was needed as per test above.
8113 -- Restore the original adjustment factor
8115 S_Adjustment
:= Save_Adjustment
;
8118 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
8120 -- Do not copy Comment or Ident pragmas their content is relevant to
8121 -- the generic unit, not to the instantiating unit.
8123 if Nam_In
(Pragma_Name_Unmapped
(N
), Name_Comment
, Name_Ident
) then
8124 New_N
:= Make_Null_Statement
(Sloc
(N
));
8126 -- Do not copy pragmas generated from aspects because the pragmas do
8127 -- not carry any semantic information, plus they will be regenerated
8130 -- However, generating C we need to copy them since postconditions
8131 -- are inlined by the front end, and the front-end inlining machinery
8132 -- relies on this routine to perform inlining.
8134 elsif From_Aspect_Specification
(N
)
8135 and then not Modify_Tree_For_C
8137 New_N
:= Make_Null_Statement
(Sloc
(N
));
8143 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
8145 -- No descendant fields need traversing
8149 elsif Nkind
(N
) = N_String_Literal
8150 and then Present
(Etype
(N
))
8151 and then Instantiating
8153 -- If the string is declared in an outer scope, the string_literal
8154 -- subtype created for it may have the wrong scope. Force reanalysis
8155 -- of the constant to generate a new itype in the proper context.
8157 Set_Etype
(New_N
, Empty
);
8158 Set_Analyzed
(New_N
, False);
8160 -- For the remaining nodes, copy their descendants recursively
8165 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
8166 Set_Generic_Parent
(Specification
(New_N
), N
);
8168 -- Should preserve Corresponding_Spec??? (12.3(14))
8172 -- Propagate dimensions if present, so that they are reflected in the
8175 if Nkind
(N
) in N_Has_Etype
8176 and then (Nkind
(N
) in N_Op
or else Is_Entity_Name
(N
))
8177 and then Present
(Etype
(N
))
8178 and then Is_Floating_Point_Type
(Etype
(N
))
8179 and then Has_Dimension_System
(Etype
(N
))
8181 Copy_Dimensions
(N
, New_N
);
8185 end Copy_Generic_Node
;
8187 ----------------------------
8188 -- Denotes_Formal_Package --
8189 ----------------------------
8191 function Denotes_Formal_Package
8193 On_Exit
: Boolean := False;
8194 Instance
: Entity_Id
:= Empty
) return Boolean
8197 Scop
: constant Entity_Id
:= Scope
(Pack
);
8200 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
8201 -- The package in question may be an actual for a previous formal
8202 -- package P of the current instance, so examine its actuals as well.
8203 -- This must be recursive over other formal packages.
8205 ----------------------------------
8206 -- Is_Actual_Of_Previous_Formal --
8207 ----------------------------------
8209 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
8213 E1
:= First_Entity
(P
);
8214 while Present
(E1
) and then E1
/= Instance
loop
8215 if Ekind
(E1
) = E_Package
8216 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
8218 if Renamed_Object
(E1
) = Pack
then
8221 elsif E1
= P
or else Renamed_Object
(E1
) = P
then
8224 elsif Is_Actual_Of_Previous_Formal
(E1
) then
8233 end Is_Actual_Of_Previous_Formal
;
8235 -- Start of processing for Denotes_Formal_Package
8241 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
8243 Par
:= Current_Instantiated_Parent
.Act_Id
;
8246 if Ekind
(Scop
) = E_Generic_Package
8247 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
8248 N_Generic_Subprogram_Declaration
8252 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
8253 N_Formal_Package_Declaration
8261 -- Check whether this package is associated with a formal package of
8262 -- the enclosing instantiation. Iterate over the list of renamings.
8264 E
:= First_Entity
(Par
);
8265 while Present
(E
) loop
8266 if Ekind
(E
) /= E_Package
8267 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
8271 elsif Renamed_Object
(E
) = Par
then
8274 elsif Renamed_Object
(E
) = Pack
then
8277 elsif Is_Actual_Of_Previous_Formal
(E
) then
8287 end Denotes_Formal_Package
;
8293 procedure End_Generic
is
8295 -- ??? More things could be factored out in this routine. Should
8296 -- probably be done at a later stage.
8298 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
8299 Generic_Flags
.Decrement_Last
;
8301 Expander_Mode_Restore
;
8308 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
8309 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
8310 -- Find distance from given node to enclosing compilation unit
8316 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
8319 and then Nkind
(P
) /= N_Compilation_Unit
8321 P
:= True_Parent
(P
);
8326 -- Local declarations
8335 -- Start of processing for Earlier
8338 Find_Depth
(P1
, D1
);
8339 Find_Depth
(P2
, D2
);
8349 P1
:= True_Parent
(P1
);
8354 P2
:= True_Parent
(P2
);
8358 -- At this point P1 and P2 are at the same distance from the root.
8359 -- We examine their parents until we find a common declarative list.
8360 -- If we reach the root, N1 and N2 do not descend from the same
8361 -- declarative list (e.g. one is nested in the declarative part and
8362 -- the other is in a block in the statement part) and the earlier
8363 -- one is already frozen.
8365 while not Is_List_Member
(P1
)
8366 or else not Is_List_Member
(P2
)
8367 or else List_Containing
(P1
) /= List_Containing
(P2
)
8369 P1
:= True_Parent
(P1
);
8370 P2
:= True_Parent
(P2
);
8372 if Nkind
(Parent
(P1
)) = N_Subunit
then
8373 P1
:= Corresponding_Stub
(Parent
(P1
));
8376 if Nkind
(Parent
(P2
)) = N_Subunit
then
8377 P2
:= Corresponding_Stub
(Parent
(P2
));
8385 -- Expanded code usually shares the source location of the original
8386 -- construct it was generated for. This however may not necessarily
8387 -- reflect the true location of the code within the tree.
8389 -- Before comparing the slocs of the two nodes, make sure that we are
8390 -- working with correct source locations. Assume that P1 is to the left
8391 -- of P2. If either one does not come from source, traverse the common
8392 -- list heading towards the other node and locate the first source
8396 -- ----+===+===+--------------+===+===+----
8397 -- expanded code expanded code
8399 if not Comes_From_Source
(P1
) then
8400 while Present
(P1
) loop
8402 -- Neither P2 nor a source statement were located during the
8403 -- search. If we reach the end of the list, then P1 does not
8404 -- occur earlier than P2.
8407 -- start --- P2 ----- P1 --- end
8409 if No
(Next
(P1
)) then
8412 -- We encounter P2 while going to the right of the list. This
8413 -- means that P1 does indeed appear earlier.
8416 -- start --- P1 ===== P2 --- end
8417 -- expanded code in between
8422 -- No need to look any further since we have located a source
8425 elsif Comes_From_Source
(P1
) then
8435 if not Comes_From_Source
(P2
) then
8436 while Present
(P2
) loop
8438 -- Neither P1 nor a source statement were located during the
8439 -- search. If we reach the start of the list, then P1 does not
8440 -- occur earlier than P2.
8443 -- start --- P2 --- P1 --- end
8445 if No
(Prev
(P2
)) then
8448 -- We encounter P1 while going to the left of the list. This
8449 -- means that P1 does indeed appear earlier.
8452 -- start --- P1 ===== P2 --- end
8453 -- expanded code in between
8458 -- No need to look any further since we have located a source
8461 elsif Comes_From_Source
(P2
) then
8471 -- At this point either both nodes came from source or we approximated
8472 -- their source locations through neighboring source statements.
8474 T1
:= Top_Level_Location
(Sloc
(P1
));
8475 T2
:= Top_Level_Location
(Sloc
(P2
));
8477 -- When two nodes come from the same instance, they have identical top
8478 -- level locations. To determine proper relation within the tree, check
8479 -- their locations within the template.
8482 return Sloc
(P1
) < Sloc
(P2
);
8484 -- The two nodes either come from unrelated instances or do not come
8485 -- from instantiated code at all.
8492 ----------------------
8493 -- Find_Actual_Type --
8494 ----------------------
8496 function Find_Actual_Type
8498 Gen_Type
: Entity_Id
) return Entity_Id
8500 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
8504 -- Special processing only applies to child units
8506 if not Is_Child_Unit
(Gen_Scope
) then
8507 return Get_Instance_Of
(Typ
);
8509 -- If designated or component type is itself a formal of the child unit,
8510 -- its instance is available.
8512 elsif Scope
(Typ
) = Gen_Scope
then
8513 return Get_Instance_Of
(Typ
);
8515 -- If the array or access type is not declared in the parent unit,
8516 -- no special processing needed.
8518 elsif not Is_Generic_Type
(Typ
)
8519 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
8521 return Get_Instance_Of
(Typ
);
8523 -- Otherwise, retrieve designated or component type by visibility
8526 T
:= Current_Entity
(Typ
);
8527 while Present
(T
) loop
8528 if In_Open_Scopes
(Scope
(T
)) then
8530 elsif Is_Generic_Actual_Type
(T
) then
8539 end Find_Actual_Type
;
8541 ----------------------------
8542 -- Freeze_Subprogram_Body --
8543 ----------------------------
8545 procedure Freeze_Subprogram_Body
8546 (Inst_Node
: Node_Id
;
8548 Pack_Id
: Entity_Id
)
8550 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8551 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
8557 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
8558 -- Find innermost package body that encloses the given node, and which
8559 -- is not a compilation unit. Freeze nodes for the instance, or for its
8560 -- enclosing body, may be inserted after the enclosing_body of the
8561 -- generic unit. Used to determine proper placement of freeze node for
8562 -- both package and subprogram instances.
8564 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
8565 -- Find entity for given package body, and locate or create a freeze
8568 ----------------------------
8569 -- Enclosing_Package_Body --
8570 ----------------------------
8572 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
8578 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
8580 if Nkind
(P
) = N_Package_Body
then
8581 if Nkind
(Parent
(P
)) = N_Subunit
then
8582 return Corresponding_Stub
(Parent
(P
));
8588 P
:= True_Parent
(P
);
8592 end Enclosing_Package_Body
;
8594 -------------------------
8595 -- Package_Freeze_Node --
8596 -------------------------
8598 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
8602 if Nkind
(B
) = N_Package_Body
then
8603 Id
:= Corresponding_Spec
(B
);
8604 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
8605 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
8608 Ensure_Freeze_Node
(Id
);
8609 return Freeze_Node
(Id
);
8610 end Package_Freeze_Node
;
8612 -- Start of processing for Freeze_Subprogram_Body
8615 -- If the instance and the generic body appear within the same unit, and
8616 -- the instance precedes the generic, the freeze node for the instance
8617 -- must appear after that of the generic. If the generic is nested
8618 -- within another instance I2, then current instance must be frozen
8619 -- after I2. In both cases, the freeze nodes are those of enclosing
8620 -- packages. Otherwise, the freeze node is placed at the end of the
8621 -- current declarative part.
8623 Enc_G
:= Enclosing_Package_Body
(Gen_Body
);
8624 Enc_I
:= Enclosing_Package_Body
(Inst_Node
);
8625 Ensure_Freeze_Node
(Pack_Id
);
8626 F_Node
:= Freeze_Node
(Pack_Id
);
8628 if Is_Generic_Instance
(Par
)
8629 and then Present
(Freeze_Node
(Par
))
8630 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
8632 -- The parent was a premature instantiation. Insert freeze node at
8633 -- the end the current declarative part.
8635 if Is_Known_Guaranteed_ABE
(Get_Unit_Instantiation_Node
(Par
)) then
8636 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8638 -- Handle the following case:
8640 -- package Parent_Inst is new ...
8643 -- procedure P ... -- this body freezes Parent_Inst
8645 -- package Inst is new ...
8647 -- In this particular scenario, the freeze node for Inst must be
8648 -- inserted in the same manner as that of Parent_Inst - before the
8649 -- next source body or at the end of the declarative list (body not
8650 -- available). If body P did not exist and Parent_Inst was frozen
8651 -- after Inst, either by a body following Inst or at the end of the
8652 -- declarative region, the freeze node for Inst must be inserted
8653 -- after that of Parent_Inst. This relation is established by
8654 -- comparing the Slocs of Parent_Inst freeze node and Inst.
8656 elsif List_Containing
(Get_Unit_Instantiation_Node
(Par
)) =
8657 List_Containing
(Inst_Node
)
8658 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Inst_Node
)
8660 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8663 Insert_After
(Freeze_Node
(Par
), F_Node
);
8666 -- The body enclosing the instance should be frozen after the body that
8667 -- includes the generic, because the body of the instance may make
8668 -- references to entities therein. If the two are not in the same
8669 -- declarative part, or if the one enclosing the instance is frozen
8670 -- already, freeze the instance at the end of the current declarative
8673 elsif Is_Generic_Instance
(Par
)
8674 and then Present
(Freeze_Node
(Par
))
8675 and then Present
(Enc_I
)
8677 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
8679 (Nkind
(Enc_I
) = N_Package_Body
8681 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
8683 -- The enclosing package may contain several instances. Rather
8684 -- than computing the earliest point at which to insert its freeze
8685 -- node, we place it at the end of the declarative part of the
8686 -- parent of the generic.
8688 Insert_Freeze_Node_For_Instance
8689 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
8692 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8694 elsif Present
(Enc_G
)
8695 and then Present
(Enc_I
)
8696 and then Enc_G
/= Enc_I
8697 and then Earlier
(Inst_Node
, Gen_Body
)
8699 if Nkind
(Enc_G
) = N_Package_Body
then
8701 Corresponding_Spec
(Enc_G
);
8702 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
8704 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
8707 -- Freeze package that encloses instance, and place node after the
8708 -- package that encloses generic. If enclosing package is already
8709 -- frozen we have to assume it is at the proper place. This may be a
8710 -- potential ABE that requires dynamic checking. Do not add a freeze
8711 -- node if the package that encloses the generic is inside the body
8712 -- that encloses the instance, because the freeze node would be in
8713 -- the wrong scope. Additional contortions needed if the bodies are
8714 -- within a subunit.
8717 Enclosing_Body
: Node_Id
;
8720 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
8721 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
8723 Enclosing_Body
:= Enc_I
;
8726 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
8727 Insert_Freeze_Node_For_Instance
8728 (Enc_G
, Package_Freeze_Node
(Enc_I
));
8732 -- Freeze enclosing subunit before instance
8734 Ensure_Freeze_Node
(E_G_Id
);
8736 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
8737 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
8740 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8743 -- If none of the above, insert freeze node at the end of the current
8744 -- declarative part.
8746 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8748 end Freeze_Subprogram_Body
;
8754 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
8756 return Generic_Renamings
.Table
(E
).Gen_Id
;
8759 ---------------------
8760 -- Get_Instance_Of --
8761 ---------------------
8763 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
8764 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
8767 if Res
/= Assoc_Null
then
8768 return Generic_Renamings
.Table
(Res
).Act_Id
;
8771 -- On exit, entity is not instantiated: not a generic parameter, or
8772 -- else parameter of an inner generic unit.
8776 end Get_Instance_Of
;
8778 ---------------------------------
8779 -- Get_Unit_Instantiation_Node --
8780 ---------------------------------
8782 function Get_Unit_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
8783 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
8787 -- If the Package_Instantiation attribute has been set on the package
8788 -- entity, then use it directly when it (or its Original_Node) refers
8789 -- to an N_Package_Instantiation node. In principle it should be
8790 -- possible to have this field set in all cases, which should be
8791 -- investigated, and would allow this function to be significantly
8794 Inst
:= Package_Instantiation
(A
);
8796 if Present
(Inst
) then
8797 if Nkind
(Inst
) = N_Package_Instantiation
then
8800 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
8801 return Original_Node
(Inst
);
8805 -- If the instantiation is a compilation unit that does not need body
8806 -- then the instantiation node has been rewritten as a package
8807 -- declaration for the instance, and we return the original node.
8809 -- If it is a compilation unit and the instance node has not been
8810 -- rewritten, then it is still the unit of the compilation. Finally, if
8811 -- a body is present, this is a parent of the main unit whose body has
8812 -- been compiled for inlining purposes, and the instantiation node has
8813 -- been rewritten with the instance body.
8815 -- Otherwise the instantiation node appears after the declaration. If
8816 -- the entity is a formal package, the declaration may have been
8817 -- rewritten as a generic declaration (in the case of a formal with box)
8818 -- or left as a formal package declaration if it has actuals, and is
8819 -- found with a forward search.
8821 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
8822 if Nkind
(Decl
) = N_Package_Declaration
8823 and then Present
(Corresponding_Body
(Decl
))
8825 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
8828 if Nkind_In
(Original_Node
(Decl
), N_Function_Instantiation
,
8829 N_Package_Instantiation
,
8830 N_Procedure_Instantiation
)
8832 return Original_Node
(Decl
);
8834 return Unit
(Parent
(Decl
));
8837 elsif Nkind
(Decl
) = N_Package_Declaration
8838 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
8840 return Original_Node
(Decl
);
8843 Inst
:= Next
(Decl
);
8844 while not Nkind_In
(Inst
, N_Formal_Package_Declaration
,
8845 N_Function_Instantiation
,
8846 N_Package_Instantiation
,
8847 N_Procedure_Instantiation
)
8854 end Get_Unit_Instantiation_Node
;
8856 ------------------------
8857 -- Has_Been_Exchanged --
8858 ------------------------
8860 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
8864 Next
:= First_Elmt
(Exchanged_Views
);
8865 while Present
(Next
) loop
8866 if Full_View
(Node
(Next
)) = E
then
8874 end Has_Been_Exchanged
;
8880 function Hash
(F
: Entity_Id
) return HTable_Range
is
8882 return HTable_Range
(F
mod HTable_Size
);
8885 ------------------------
8886 -- Hide_Current_Scope --
8887 ------------------------
8889 procedure Hide_Current_Scope
is
8890 C
: constant Entity_Id
:= Current_Scope
;
8894 Set_Is_Hidden_Open_Scope
(C
);
8896 E
:= First_Entity
(C
);
8897 while Present
(E
) loop
8898 if Is_Immediately_Visible
(E
) then
8899 Set_Is_Immediately_Visible
(E
, False);
8900 Append_Elmt
(E
, Hidden_Entities
);
8906 -- Make the scope name invisible as well. This is necessary, but might
8907 -- conflict with calls to Rtsfind later on, in case the scope is a
8908 -- predefined one. There is no clean solution to this problem, so for
8909 -- now we depend on the user not redefining Standard itself in one of
8910 -- the parent units.
8912 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
8913 Set_Is_Immediately_Visible
(C
, False);
8914 Append_Elmt
(C
, Hidden_Entities
);
8917 end Hide_Current_Scope
;
8923 procedure Init_Env
is
8924 Saved
: Instance_Env
;
8927 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
8928 Saved
.Exchanged_Views
:= Exchanged_Views
;
8929 Saved
.Hidden_Entities
:= Hidden_Entities
;
8930 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
8931 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
8932 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
8934 -- Save configuration switches. These may be reset if the unit is a
8935 -- predefined unit, and the current mode is not Ada 2005.
8937 Save_Opt_Config_Switches
(Saved
.Switches
);
8939 Instance_Envs
.Append
(Saved
);
8941 Exchanged_Views
:= New_Elmt_List
;
8942 Hidden_Entities
:= New_Elmt_List
;
8944 -- Make dummy entry for Instantiated parent. If generic unit is legal,
8945 -- this is set properly in Set_Instance_Env.
8947 Current_Instantiated_Parent
:=
8948 (Current_Scope
, Current_Scope
, Assoc_Null
);
8951 ------------------------------
8952 -- In_Same_Declarative_Part --
8953 ------------------------------
8955 function In_Same_Declarative_Part
8957 Inst
: Node_Id
) return Boolean
8959 Decls
: constant Node_Id
:= Parent
(F_Node
);
8963 Nod
:= Parent
(Inst
);
8964 while Present
(Nod
) loop
8968 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
8970 N_Package_Declaration
,
8977 elsif Nkind
(Nod
) = N_Subunit
then
8978 Nod
:= Corresponding_Stub
(Nod
);
8980 elsif Nkind
(Nod
) = N_Compilation_Unit
then
8984 Nod
:= Parent
(Nod
);
8989 end In_Same_Declarative_Part
;
8991 ---------------------
8992 -- In_Main_Context --
8993 ---------------------
8995 function In_Main_Context
(E
: Entity_Id
) return Boolean is
9001 if not Is_Compilation_Unit
(E
)
9002 or else Ekind
(E
) /= E_Package
9003 or else In_Private_Part
(E
)
9008 Context
:= Context_Items
(Cunit
(Main_Unit
));
9010 Clause
:= First
(Context
);
9011 while Present
(Clause
) loop
9012 if Nkind
(Clause
) = N_With_Clause
then
9013 Nam
:= Name
(Clause
);
9015 -- If the current scope is part of the context of the main unit,
9016 -- analysis of the corresponding with_clause is not complete, and
9017 -- the entity is not set. We use the Chars field directly, which
9018 -- might produce false positives in rare cases, but guarantees
9019 -- that we produce all the instance bodies we will need.
9021 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
9022 or else (Nkind
(Nam
) = N_Selected_Component
9023 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
9033 end In_Main_Context
;
9035 ---------------------
9036 -- Inherit_Context --
9037 ---------------------
9039 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
9040 Current_Context
: List_Id
;
9041 Current_Unit
: Node_Id
;
9050 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
9052 -- The inherited context is attached to the enclosing compilation
9053 -- unit. This is either the main unit, or the declaration for the
9054 -- main unit (in case the instantiation appears within the package
9055 -- declaration and the main unit is its body).
9057 Current_Unit
:= Parent
(Inst
);
9058 while Present
(Current_Unit
)
9059 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
9061 Current_Unit
:= Parent
(Current_Unit
);
9064 Current_Context
:= Context_Items
(Current_Unit
);
9066 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
9067 while Present
(Item
) loop
9068 if Nkind
(Item
) = N_With_Clause
then
9069 Lib_Unit
:= Library_Unit
(Item
);
9071 -- Take care to prevent direct cyclic with's
9073 if Lib_Unit
/= Current_Unit
then
9075 -- Do not add a unit if it is already in the context
9077 Clause
:= First
(Current_Context
);
9079 while Present
(Clause
) loop
9080 if Nkind
(Clause
) = N_With_Clause
and then
9081 Library_Unit
(Clause
) = Lib_Unit
9091 New_I
:= New_Copy
(Item
);
9092 Set_Implicit_With
(New_I
, True);
9093 Set_Implicit_With_From_Instantiation
(New_I
, True);
9094 Append
(New_I
, Current_Context
);
9102 end Inherit_Context
;
9108 procedure Initialize
is
9110 Generic_Renamings
.Init
;
9113 Generic_Renamings_HTable
.Reset
;
9114 Circularity_Detected
:= False;
9115 Exchanged_Views
:= No_Elist
;
9116 Hidden_Entities
:= No_Elist
;
9119 -------------------------------------
9120 -- Insert_Freeze_Node_For_Instance --
9121 -------------------------------------
9123 procedure Insert_Freeze_Node_For_Instance
9132 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
9133 -- Find enclosing package or subprogram body, if any. Freeze node may
9134 -- be placed at end of current declarative list if previous instance
9135 -- and current one have different enclosing bodies.
9137 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
9138 -- Find the local instance, if any, that declares the generic that is
9139 -- being instantiated. If present, the freeze node for this instance
9140 -- must follow the freeze node for the previous instance.
9142 --------------------
9143 -- Enclosing_Body --
9144 --------------------
9146 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
9152 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9154 if Nkind_In
(P
, N_Package_Body
, N_Subprogram_Body
) then
9155 if Nkind
(Parent
(P
)) = N_Subunit
then
9156 return Corresponding_Stub
(Parent
(P
));
9162 P
:= True_Parent
(P
);
9168 -----------------------
9169 -- Previous_Instance --
9170 -----------------------
9172 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
9177 while Present
(S
) and then S
/= Standard_Standard
loop
9178 if Is_Generic_Instance
(S
)
9179 and then In_Same_Source_Unit
(S
, N
)
9188 end Previous_Instance
;
9190 -- Start of processing for Insert_Freeze_Node_For_Instance
9193 if not Is_List_Member
(F_Node
) then
9195 Decls
:= List_Containing
(N
);
9196 Inst
:= Entity
(F_Node
);
9197 Par_N
:= Parent
(Decls
);
9199 -- When processing a subprogram instantiation, utilize the actual
9200 -- subprogram instantiation rather than its package wrapper as it
9201 -- carries all the context information.
9203 if Is_Wrapper_Package
(Inst
) then
9204 Inst
:= Related_Instance
(Inst
);
9207 -- If this is a package instance, check whether the generic is
9208 -- declared in a previous instance and the current instance is
9209 -- not within the previous one.
9211 if Present
(Generic_Parent
(Parent
(Inst
)))
9212 and then Is_In_Main_Unit
(N
)
9215 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
9216 Par_I
: constant Entity_Id
:=
9218 (Generic_Parent
(Parent
(Inst
)));
9223 and then Earlier
(N
, Freeze_Node
(Par_I
))
9225 Scop
:= Scope
(Inst
);
9227 -- If the current instance is within the one that contains
9228 -- the generic, the freeze node for the current one must
9229 -- appear in the current declarative part. Ditto, if the
9230 -- current instance is within another package instance or
9231 -- within a body that does not enclose the current instance.
9232 -- In these three cases the freeze node of the previous
9233 -- instance is not relevant.
9235 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
9236 exit when Scop
= Par_I
9238 (Is_Generic_Instance
(Scop
)
9239 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
9240 Scop
:= Scope
(Scop
);
9243 -- Previous instance encloses current instance
9245 if Scop
= Par_I
then
9248 -- If the next node is a source body we must freeze in
9249 -- the current scope as well.
9251 elsif Present
(Next
(N
))
9252 and then Nkind_In
(Next
(N
), N_Subprogram_Body
,
9254 and then Comes_From_Source
(Next
(N
))
9258 -- Current instance is within an unrelated instance
9260 elsif Is_Generic_Instance
(Scop
) then
9263 -- Current instance is within an unrelated body
9265 elsif Present
(Enclosing_N
)
9266 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
9271 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
9278 -- When the instantiation occurs in a package declaration, append the
9279 -- freeze node to the private declarations (if any).
9281 if Nkind
(Par_N
) = N_Package_Specification
9282 and then Decls
= Visible_Declarations
(Par_N
)
9283 and then Present
(Private_Declarations
(Par_N
))
9284 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
9286 Decls
:= Private_Declarations
(Par_N
);
9287 Decl
:= First
(Decls
);
9290 -- Determine the proper freeze point of a package instantiation. We
9291 -- adhere to the general rule of a package or subprogram body causing
9292 -- freezing of anything before it in the same declarative region. In
9293 -- this case, the proper freeze point of a package instantiation is
9294 -- before the first source body which follows, or before a stub. This
9295 -- ensures that entities coming from the instance are already frozen
9296 -- and usable in source bodies.
9298 if Nkind
(Par_N
) /= N_Package_Declaration
9299 and then Ekind
(Inst
) = E_Package
9300 and then Is_Generic_Instance
(Inst
)
9302 not In_Same_Source_Unit
(Generic_Parent
(Parent
(Inst
)), Inst
)
9304 while Present
(Decl
) loop
9305 if (Nkind
(Decl
) in N_Unit_Body
9307 Nkind
(Decl
) in N_Body_Stub
)
9308 and then Comes_From_Source
(Decl
)
9310 Insert_Before
(Decl
, F_Node
);
9318 -- In a package declaration, or if no previous body, insert at end
9321 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
9322 Insert_After
(Last
(Decls
), F_Node
);
9324 end Insert_Freeze_Node_For_Instance
;
9330 procedure Install_Body
9331 (Act_Body
: Node_Id
;
9336 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean;
9337 -- Check if the generic definition and the instantiation come from
9338 -- a common scope, in which case the instance must be frozen after
9339 -- the generic body.
9341 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
;
9342 -- If the instance is nested inside a generic unit, the Sloc of the
9343 -- instance indicates the place of the original definition, not the
9344 -- point of the current enclosing instance. Pending a better usage of
9345 -- Slocs to indicate instantiation places, we determine the place of
9346 -- origin of a node by finding the maximum sloc of any ancestor node.
9347 -- Why is this not equivalent to Top_Level_Location ???
9353 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean is
9354 Act_Scop
: Entity_Id
:= Scope
(Act_Id
);
9355 Gen_Scop
: Entity_Id
:= Scope
(Gen_Id
);
9358 while Act_Scop
/= Standard_Standard
9359 and then Gen_Scop
/= Standard_Standard
9361 if Act_Scop
= Gen_Scop
then
9365 Act_Scop
:= Scope
(Act_Scop
);
9366 Gen_Scop
:= Scope
(Gen_Scop
);
9376 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
is
9383 while Present
(N1
) and then N1
/= Act_Unit
loop
9384 if Sloc
(N1
) > Res
then
9394 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
9395 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
9396 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
9397 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
9398 Gen_Unit
: constant Node_Id
:=
9399 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
9401 Body_Unit
: Node_Id
;
9403 Must_Delay
: Boolean;
9404 Orig_Body
: Node_Id
:= Gen_Body
;
9406 -- Start of processing for Install_Body
9409 -- Handle first the case of an instance with incomplete actual types.
9410 -- The instance body cannot be placed after the declaration because
9411 -- full views have not been seen yet. Any use of the non-limited views
9412 -- in the instance body requires the presence of a regular with_clause
9413 -- in the enclosing unit, and will fail if this with_clause is missing.
9414 -- We place the instance body at the beginning of the enclosing body,
9415 -- which is the unit being compiled. The freeze node for the instance
9416 -- is then placed after the instance body.
9418 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Id
))
9419 and then Expander_Active
9420 and then Ekind
(Scope
(Act_Id
)) = E_Package
9423 Scop
: constant Entity_Id
:= Scope
(Act_Id
);
9424 Body_Id
: constant Node_Id
:=
9425 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
9428 Ensure_Freeze_Node
(Act_Id
);
9429 F_Node
:= Freeze_Node
(Act_Id
);
9430 if Present
(Body_Id
) then
9431 Set_Is_Frozen
(Act_Id
, False);
9432 Prepend
(Act_Body
, Declarations
(Parent
(Body_Id
)));
9433 if Is_List_Member
(F_Node
) then
9437 Insert_After
(Act_Body
, F_Node
);
9443 -- If the body is a subunit, the freeze point is the corresponding stub
9444 -- in the current compilation, not the subunit itself.
9446 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
9447 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
9449 Orig_Body
:= Gen_Body
;
9452 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
9454 -- If the instantiation and the generic definition appear in the same
9455 -- package declaration, this is an early instantiation. If they appear
9456 -- in the same declarative part, it is an early instantiation only if
9457 -- the generic body appears textually later, and the generic body is
9458 -- also in the main unit.
9460 -- If instance is nested within a subprogram, and the generic body
9461 -- is not, the instance is delayed because the enclosing body is. If
9462 -- instance and body are within the same scope, or the same subprogram
9463 -- body, indicate explicitly that the instance is delayed.
9466 (Gen_Unit
= Act_Unit
9467 and then (Nkind_In
(Gen_Unit
, N_Generic_Package_Declaration
,
9468 N_Package_Declaration
)
9469 or else (Gen_Unit
= Body_Unit
9470 and then True_Sloc
(N
, Act_Unit
) <
9472 and then Is_In_Main_Unit
(Original_Node
(Gen_Unit
))
9473 and then In_Same_Scope
(Gen_Id
, Act_Id
));
9475 -- If this is an early instantiation, the freeze node is placed after
9476 -- the generic body. Otherwise, if the generic appears in an instance,
9477 -- we cannot freeze the current instance until the outer one is frozen.
9478 -- This is only relevant if the current instance is nested within some
9479 -- inner scope not itself within the outer instance. If this scope is
9480 -- a package body in the same declarative part as the outer instance,
9481 -- then that body needs to be frozen after the outer instance. Finally,
9482 -- if no delay is needed, we place the freeze node at the end of the
9483 -- current declarative part.
9486 and then (No
(Freeze_Node
(Act_Id
))
9487 or else not Is_List_Member
(Freeze_Node
(Act_Id
)))
9489 Ensure_Freeze_Node
(Act_Id
);
9490 F_Node
:= Freeze_Node
(Act_Id
);
9493 Insert_After
(Orig_Body
, F_Node
);
9495 elsif Is_Generic_Instance
(Par
)
9496 and then Present
(Freeze_Node
(Par
))
9497 and then Scope
(Act_Id
) /= Par
9499 -- Freeze instance of inner generic after instance of enclosing
9502 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
9504 -- Handle the following case:
9506 -- package Parent_Inst is new ...
9509 -- procedure P ... -- this body freezes Parent_Inst
9511 -- package Inst is new ...
9513 -- In this particular scenario, the freeze node for Inst must
9514 -- be inserted in the same manner as that of Parent_Inst,
9515 -- before the next source body or at the end of the declarative
9516 -- list (body not available). If body P did not exist and
9517 -- Parent_Inst was frozen after Inst, either by a body
9518 -- following Inst or at the end of the declarative region,
9519 -- the freeze node for Inst must be inserted after that of
9520 -- Parent_Inst. This relation is established by comparing
9521 -- the Slocs of Parent_Inst freeze node and Inst.
9523 if List_Containing
(Get_Unit_Instantiation_Node
(Par
)) =
9525 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(N
)
9527 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9529 Insert_After
(Freeze_Node
(Par
), F_Node
);
9532 -- Freeze package enclosing instance of inner generic after
9533 -- instance of enclosing generic.
9535 elsif Nkind_In
(Parent
(N
), N_Package_Body
, N_Subprogram_Body
)
9536 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
9539 Enclosing
: Entity_Id
;
9542 Enclosing
:= Corresponding_Spec
(Parent
(N
));
9544 if No
(Enclosing
) then
9545 Enclosing
:= Defining_Entity
(Parent
(N
));
9548 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9549 Ensure_Freeze_Node
(Enclosing
);
9551 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
9553 -- The enclosing context is a subunit, insert the freeze
9554 -- node after the stub.
9556 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
9557 Insert_Freeze_Node_For_Instance
9558 (Corresponding_Stub
(Parent
(Parent
(N
))),
9559 Freeze_Node
(Enclosing
));
9561 -- The enclosing context is a package with a stub body
9562 -- which has already been replaced by the real body.
9563 -- Insert the freeze node after the actual body.
9565 elsif Ekind
(Enclosing
) = E_Package
9566 and then Present
(Body_Entity
(Enclosing
))
9567 and then Was_Originally_Stub
9568 (Parent
(Body_Entity
(Enclosing
)))
9570 Insert_Freeze_Node_For_Instance
9571 (Parent
(Body_Entity
(Enclosing
)),
9572 Freeze_Node
(Enclosing
));
9574 -- The parent instance has been frozen before the body of
9575 -- the enclosing package, insert the freeze node after
9578 elsif List_Containing
(Freeze_Node
(Par
)) =
9579 List_Containing
(Parent
(N
))
9580 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Parent
(N
))
9582 Insert_Freeze_Node_For_Instance
9583 (Parent
(N
), Freeze_Node
(Enclosing
));
9587 (Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
9593 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9597 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9601 Set_Is_Frozen
(Act_Id
);
9602 Insert_Before
(N
, Act_Body
);
9603 Mark_Rewrite_Insertion
(Act_Body
);
9606 -----------------------------
9607 -- Install_Formal_Packages --
9608 -----------------------------
9610 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
9613 Gen_E
: Entity_Id
:= Empty
;
9616 E
:= First_Entity
(Par
);
9618 -- If we are installing an instance parent, locate the formal packages
9619 -- of its generic parent.
9621 if Is_Generic_Instance
(Par
) then
9622 Gen
:= Generic_Parent
(Package_Specification
(Par
));
9623 Gen_E
:= First_Entity
(Gen
);
9626 while Present
(E
) loop
9627 if Ekind
(E
) = E_Package
9628 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
9630 -- If this is the renaming for the parent instance, done
9632 if Renamed_Object
(E
) = Par
then
9635 -- The visibility of a formal of an enclosing generic is already
9638 elsif Denotes_Formal_Package
(E
) then
9641 elsif Present
(Associated_Formal_Package
(E
)) then
9642 Check_Generic_Actuals
(Renamed_Object
(E
), True);
9643 Set_Is_Hidden
(E
, False);
9645 -- Find formal package in generic unit that corresponds to
9646 -- (instance of) formal package in instance.
9648 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
9649 Next_Entity
(Gen_E
);
9652 if Present
(Gen_E
) then
9653 Map_Formal_Package_Entities
(Gen_E
, E
);
9660 if Present
(Gen_E
) then
9661 Next_Entity
(Gen_E
);
9664 end Install_Formal_Packages
;
9666 --------------------
9667 -- Install_Parent --
9668 --------------------
9670 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
9671 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
9672 S
: constant Entity_Id
:= Current_Scope
;
9673 Inst_Par
: Entity_Id
;
9674 First_Par
: Entity_Id
;
9675 Inst_Node
: Node_Id
;
9676 Gen_Par
: Entity_Id
;
9677 First_Gen
: Entity_Id
;
9680 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
9681 -- Install the scopes of noninstance parent units ending with Par
9683 procedure Install_Spec
(Par
: Entity_Id
);
9684 -- The child unit is within the declarative part of the parent, so the
9685 -- declarations within the parent are immediately visible.
9687 -------------------------------
9688 -- Install_Noninstance_Specs --
9689 -------------------------------
9691 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
9694 and then Par
/= Standard_Standard
9695 and then not In_Open_Scopes
(Par
)
9697 Install_Noninstance_Specs
(Scope
(Par
));
9700 end Install_Noninstance_Specs
;
9706 procedure Install_Spec
(Par
: Entity_Id
) is
9707 Spec
: constant Node_Id
:= Package_Specification
(Par
);
9710 -- If this parent of the child instance is a top-level unit,
9711 -- then record the unit and its visibility for later resetting in
9712 -- Remove_Parent. We exclude units that are generic instances, as we
9713 -- only want to record this information for the ultimate top-level
9714 -- noninstance parent (is that always correct???).
9716 if Scope
(Par
) = Standard_Standard
9717 and then not Is_Generic_Instance
(Par
)
9719 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
9720 Instance_Parent_Unit
:= Par
;
9723 -- Open the parent scope and make it and its declarations visible.
9724 -- If this point is not within a body, then only the visible
9725 -- declarations should be made visible, and installation of the
9726 -- private declarations is deferred until the appropriate point
9727 -- within analysis of the spec being instantiated (see the handling
9728 -- of parent visibility in Analyze_Package_Specification). This is
9729 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
9730 -- private view problems that occur when compiling instantiations of
9731 -- a generic child of that package (Generic_Dispatching_Constructor).
9732 -- If the instance freezes a tagged type, inlinings of operations
9733 -- from Ada.Tags may need the full view of type Tag. If inlining took
9734 -- proper account of establishing visibility of inlined subprograms'
9735 -- parents then it should be possible to remove this
9736 -- special check. ???
9739 Set_Is_Immediately_Visible
(Par
);
9740 Install_Visible_Declarations
(Par
);
9741 Set_Use
(Visible_Declarations
(Spec
));
9743 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
9744 Install_Private_Declarations
(Par
);
9745 Set_Use
(Private_Declarations
(Spec
));
9749 -- Start of processing for Install_Parent
9752 -- We need to install the parent instance to compile the instantiation
9753 -- of the child, but the child instance must appear in the current
9754 -- scope. Given that we cannot place the parent above the current scope
9755 -- in the scope stack, we duplicate the current scope and unstack both
9756 -- after the instantiation is complete.
9758 -- If the parent is itself the instantiation of a child unit, we must
9759 -- also stack the instantiation of its parent, and so on. Each such
9760 -- ancestor is the prefix of the name in a prior instantiation.
9762 -- If this is a nested instance, the parent unit itself resolves to
9763 -- a renaming of the parent instance, whose declaration we need.
9765 -- Finally, the parent may be a generic (not an instance) when the
9766 -- child unit appears as a formal package.
9770 if Present
(Renamed_Entity
(Inst_Par
)) then
9771 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9774 First_Par
:= Inst_Par
;
9776 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9778 First_Gen
:= Gen_Par
;
9780 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
9782 -- Load grandparent instance as well
9784 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
9786 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
9787 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
9789 if Present
(Renamed_Entity
(Inst_Par
)) then
9790 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9793 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9795 if Present
(Gen_Par
) then
9796 Prepend_Elmt
(Inst_Par
, Ancestors
);
9799 -- Parent is not the name of an instantiation
9801 Install_Noninstance_Specs
(Inst_Par
);
9812 if Present
(First_Gen
) then
9813 Append_Elmt
(First_Par
, Ancestors
);
9815 Install_Noninstance_Specs
(First_Par
);
9818 if not Is_Empty_Elmt_List
(Ancestors
) then
9819 Elmt
:= First_Elmt
(Ancestors
);
9820 while Present
(Elmt
) loop
9821 Install_Spec
(Node
(Elmt
));
9822 Install_Formal_Packages
(Node
(Elmt
));
9832 -------------------------------
9833 -- Install_Hidden_Primitives --
9834 -------------------------------
9836 procedure Install_Hidden_Primitives
9837 (Prims_List
: in out Elist_Id
;
9842 List
: Elist_Id
:= No_Elist
;
9843 Prim_G_Elmt
: Elmt_Id
;
9844 Prim_A_Elmt
: Elmt_Id
;
9849 -- No action needed in case of serious errors because we cannot trust
9850 -- in the order of primitives
9852 if Serious_Errors_Detected
> 0 then
9855 -- No action possible if we don't have available the list of primitive
9859 or else not Is_Record_Type
(Gen_T
)
9860 or else not Is_Tagged_Type
(Gen_T
)
9861 or else not Is_Record_Type
(Act_T
)
9862 or else not Is_Tagged_Type
(Act_T
)
9866 -- There is no need to handle interface types since their primitives
9869 elsif Is_Interface
(Gen_T
) then
9873 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
9875 if not Is_Class_Wide_Type
(Act_T
) then
9876 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
9878 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
9882 -- Skip predefined primitives in the generic formal
9884 while Present
(Prim_G_Elmt
)
9885 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
9887 Next_Elmt
(Prim_G_Elmt
);
9890 -- Skip predefined primitives in the generic actual
9892 while Present
(Prim_A_Elmt
)
9893 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
9895 Next_Elmt
(Prim_A_Elmt
);
9898 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
9900 Prim_G
:= Node
(Prim_G_Elmt
);
9901 Prim_A
:= Node
(Prim_A_Elmt
);
9903 -- There is no need to handle interface primitives because their
9904 -- primitives are not hidden
9906 exit when Present
(Interface_Alias
(Prim_G
));
9908 -- Here we install one hidden primitive
9910 if Chars
(Prim_G
) /= Chars
(Prim_A
)
9911 and then Has_Suffix
(Prim_A
, 'P')
9912 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
9914 Set_Chars
(Prim_A
, Chars
(Prim_G
));
9915 Append_New_Elmt
(Prim_A
, To
=> List
);
9918 Next_Elmt
(Prim_A_Elmt
);
9919 Next_Elmt
(Prim_G_Elmt
);
9922 -- Append the elements to the list of temporarily visible primitives
9923 -- avoiding duplicates.
9925 if Present
(List
) then
9926 if No
(Prims_List
) then
9927 Prims_List
:= New_Elmt_List
;
9930 Elmt
:= First_Elmt
(List
);
9931 while Present
(Elmt
) loop
9932 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
9936 end Install_Hidden_Primitives
;
9938 -------------------------------
9939 -- Restore_Hidden_Primitives --
9940 -------------------------------
9942 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
9943 Prim_Elmt
: Elmt_Id
;
9947 if Prims_List
/= No_Elist
then
9948 Prim_Elmt
:= First_Elmt
(Prims_List
);
9949 while Present
(Prim_Elmt
) loop
9950 Prim
:= Node
(Prim_Elmt
);
9951 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
9952 Next_Elmt
(Prim_Elmt
);
9955 Prims_List
:= No_Elist
;
9957 end Restore_Hidden_Primitives
;
9959 --------------------------------
9960 -- Instantiate_Formal_Package --
9961 --------------------------------
9963 function Instantiate_Formal_Package
9966 Analyzed_Formal
: Node_Id
) return List_Id
9968 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
9969 Actual_Pack
: Entity_Id
;
9970 Formal_Pack
: Entity_Id
;
9971 Gen_Parent
: Entity_Id
;
9974 Parent_Spec
: Node_Id
;
9976 procedure Find_Matching_Actual
9978 Act
: in out Entity_Id
);
9979 -- We need to associate each formal entity in the formal package with
9980 -- the corresponding entity in the actual package. The actual package
9981 -- has been analyzed and possibly expanded, and as a result there is
9982 -- no one-to-one correspondence between the two lists (for example,
9983 -- the actual may include subtypes, itypes, and inherited primitive
9984 -- operations, interspersed among the renaming declarations for the
9985 -- actuals). We retrieve the corresponding actual by name because each
9986 -- actual has the same name as the formal, and they do appear in the
9989 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
9990 -- Retrieve entity of defining entity of generic formal parameter.
9991 -- Only the declarations of formals need to be considered when
9992 -- linking them to actuals, but the declarative list may include
9993 -- internal entities generated during analysis, and those are ignored.
9995 procedure Match_Formal_Entity
9996 (Formal_Node
: Node_Id
;
9997 Formal_Ent
: Entity_Id
;
9998 Actual_Ent
: Entity_Id
);
9999 -- Associates the formal entity with the actual. In the case where
10000 -- Formal_Ent is a formal package, this procedure iterates through all
10001 -- of its formals and enters associations between the actuals occurring
10002 -- in the formal package's corresponding actual package (given by
10003 -- Actual_Ent) and the formal package's formal parameters. This
10004 -- procedure recurses if any of the parameters is itself a package.
10006 function Is_Instance_Of
10007 (Act_Spec
: Entity_Id
;
10008 Gen_Anc
: Entity_Id
) return Boolean;
10009 -- The actual can be an instantiation of a generic within another
10010 -- instance, in which case there is no direct link from it to the
10011 -- original generic ancestor. In that case, we recognize that the
10012 -- ultimate ancestor is the same by examining names and scopes.
10014 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
10015 -- If the current formal is declared with a box, its own formals are
10016 -- visible in the instance, as they were in the generic, and their
10017 -- Hidden flag must be reset. If some of these formals are themselves
10018 -- packages declared with a box, the processing must be recursive.
10020 --------------------------
10021 -- Find_Matching_Actual --
10022 --------------------------
10024 procedure Find_Matching_Actual
10026 Act
: in out Entity_Id
)
10028 Formal_Ent
: Entity_Id
;
10031 case Nkind
(Original_Node
(F
)) is
10032 when N_Formal_Object_Declaration
10033 | N_Formal_Type_Declaration
10035 Formal_Ent
:= Defining_Identifier
(F
);
10037 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
10041 when N_Formal_Package_Declaration
10042 | N_Formal_Subprogram_Declaration
10043 | N_Generic_Package_Declaration
10044 | N_Package_Declaration
10046 Formal_Ent
:= Defining_Entity
(F
);
10048 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
10053 raise Program_Error
;
10055 end Find_Matching_Actual
;
10057 -------------------------
10058 -- Match_Formal_Entity --
10059 -------------------------
10061 procedure Match_Formal_Entity
10062 (Formal_Node
: Node_Id
;
10063 Formal_Ent
: Entity_Id
;
10064 Actual_Ent
: Entity_Id
)
10066 Act_Pkg
: Entity_Id
;
10069 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
10071 if Ekind
(Actual_Ent
) = E_Package
then
10073 -- Record associations for each parameter
10075 Act_Pkg
:= Actual_Ent
;
10078 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
10082 Gen_Decl
: Node_Id
;
10084 Actual
: Entity_Id
;
10087 -- Retrieve the actual given in the formal package declaration
10089 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
10091 -- The actual in the formal package declaration may be a
10092 -- renamed generic package, in which case we want to retrieve
10093 -- the original generic in order to traverse its formal part.
10095 if Present
(Renamed_Entity
(Actual
)) then
10096 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
10098 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
10101 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
10103 if Present
(Formals
) then
10104 F_Node
:= First_Non_Pragma
(Formals
);
10109 while Present
(A_Ent
)
10110 and then Present
(F_Node
)
10111 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
10113 F_Ent
:= Get_Formal_Entity
(F_Node
);
10115 if Present
(F_Ent
) then
10117 -- This is a formal of the original package. Record
10118 -- association and recurse.
10120 Find_Matching_Actual
(F_Node
, A_Ent
);
10121 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
10122 Next_Entity
(A_Ent
);
10125 Next_Non_Pragma
(F_Node
);
10129 end Match_Formal_Entity
;
10131 -----------------------
10132 -- Get_Formal_Entity --
10133 -----------------------
10135 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
10136 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
10139 when N_Formal_Object_Declaration
=>
10140 return Defining_Identifier
(N
);
10142 when N_Formal_Type_Declaration
=>
10143 return Defining_Identifier
(N
);
10145 when N_Formal_Subprogram_Declaration
=>
10146 return Defining_Unit_Name
(Specification
(N
));
10148 when N_Formal_Package_Declaration
=>
10149 return Defining_Identifier
(Original_Node
(N
));
10151 when N_Generic_Package_Declaration
=>
10152 return Defining_Identifier
(Original_Node
(N
));
10154 -- All other declarations are introduced by semantic analysis and
10155 -- have no match in the actual.
10160 end Get_Formal_Entity
;
10162 --------------------
10163 -- Is_Instance_Of --
10164 --------------------
10166 function Is_Instance_Of
10167 (Act_Spec
: Entity_Id
;
10168 Gen_Anc
: Entity_Id
) return Boolean
10170 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
10173 if No
(Gen_Par
) then
10176 -- Simplest case: the generic parent of the actual is the formal
10178 elsif Gen_Par
= Gen_Anc
then
10181 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
10184 -- The actual may be obtained through several instantiations. Its
10185 -- scope must itself be an instance of a generic declared in the
10186 -- same scope as the formal. Any other case is detected above.
10188 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
10192 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
10194 end Is_Instance_Of
;
10196 ---------------------------
10197 -- Process_Nested_Formal --
10198 ---------------------------
10200 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
10204 if Present
(Associated_Formal_Package
(Formal
))
10205 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
10207 Ent
:= First_Entity
(Formal
);
10208 while Present
(Ent
) loop
10209 Set_Is_Hidden
(Ent
, False);
10210 Set_Is_Visible_Formal
(Ent
);
10211 Set_Is_Potentially_Use_Visible
10212 (Ent
, Is_Potentially_Use_Visible
(Formal
));
10214 if Ekind
(Ent
) = E_Package
then
10215 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10216 Process_Nested_Formal
(Ent
);
10222 end Process_Nested_Formal
;
10224 -- Start of processing for Instantiate_Formal_Package
10229 if not Is_Entity_Name
(Actual
)
10230 or else Ekind
(Entity
(Actual
)) /= E_Package
10233 ("expect package instance to instantiate formal", Actual
);
10234 Abandon_Instantiation
(Actual
);
10235 raise Program_Error
;
10238 Actual_Pack
:= Entity
(Actual
);
10239 Set_Is_Instantiated
(Actual_Pack
);
10241 -- The actual may be a renamed package, or an outer generic formal
10242 -- package whose instantiation is converted into a renaming.
10244 if Present
(Renamed_Object
(Actual_Pack
)) then
10245 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
10248 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
10249 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
10250 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
10253 Generic_Parent
(Specification
(Analyzed_Formal
));
10255 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10258 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
10259 Parent_Spec
:= Package_Specification
(Actual_Pack
);
10261 Parent_Spec
:= Parent
(Actual_Pack
);
10264 if Gen_Parent
= Any_Id
then
10266 ("previous error in declaration of formal package", Actual
);
10267 Abandon_Instantiation
(Actual
);
10270 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
10276 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
10277 Abandon_Instantiation
(Actual
);
10280 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
10281 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
10284 Make_Package_Renaming_Declaration
(Loc
,
10285 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
10286 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
10288 Set_Associated_Formal_Package
10289 (Defining_Unit_Name
(Nod
), Defining_Identifier
(Formal
));
10290 Decls
:= New_List
(Nod
);
10292 -- If the formal F has a box, then the generic declarations are
10293 -- visible in the generic G. In an instance of G, the corresponding
10294 -- entities in the actual for F (which are the actuals for the
10295 -- instantiation of the generic that F denotes) must also be made
10296 -- visible for analysis of the current instance. On exit from the
10297 -- current instance, those entities are made private again. If the
10298 -- actual is currently in use, these entities are also use-visible.
10300 -- The loop through the actual entities also steps through the formal
10301 -- entities and enters associations from formals to actuals into the
10302 -- renaming map. This is necessary to properly handle checking of
10303 -- actual parameter associations for later formals that depend on
10304 -- actuals declared in the formal package.
10306 -- In Ada 2005, partial parameterization requires that we make
10307 -- visible the actuals corresponding to formals that were defaulted
10308 -- in the formal package. There formals are identified because they
10309 -- remain formal generics within the formal package, rather than
10310 -- being renamings of the actuals supplied.
10313 Gen_Decl
: constant Node_Id
:=
10314 Unit_Declaration_Node
(Gen_Parent
);
10315 Formals
: constant List_Id
:=
10316 Generic_Formal_Declarations
(Gen_Decl
);
10318 Actual_Ent
: Entity_Id
;
10319 Actual_Of_Formal
: Node_Id
;
10320 Formal_Node
: Node_Id
;
10321 Formal_Ent
: Entity_Id
;
10324 if Present
(Formals
) then
10325 Formal_Node
:= First_Non_Pragma
(Formals
);
10327 Formal_Node
:= Empty
;
10330 Actual_Ent
:= First_Entity
(Actual_Pack
);
10331 Actual_Of_Formal
:=
10332 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
10333 while Present
(Actual_Ent
)
10334 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10336 if Present
(Formal_Node
) then
10337 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
10339 if Present
(Formal_Ent
) then
10340 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
10341 Match_Formal_Entity
(Formal_Node
, Formal_Ent
, Actual_Ent
);
10343 -- We iterate at the same time over the actuals of the
10344 -- local package created for the formal, to determine
10345 -- which one of the formals of the original generic were
10346 -- defaulted in the formal. The corresponding actual
10347 -- entities are visible in the enclosing instance.
10349 if Box_Present
(Formal
)
10351 (Present
(Actual_Of_Formal
)
10354 (Get_Formal_Entity
(Actual_Of_Formal
)))
10356 Set_Is_Hidden
(Actual_Ent
, False);
10357 Set_Is_Visible_Formal
(Actual_Ent
);
10358 Set_Is_Potentially_Use_Visible
10359 (Actual_Ent
, In_Use
(Actual_Pack
));
10361 if Ekind
(Actual_Ent
) = E_Package
then
10362 Process_Nested_Formal
(Actual_Ent
);
10366 Set_Is_Hidden
(Actual_Ent
);
10367 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
10371 Next_Non_Pragma
(Formal_Node
);
10372 Next
(Actual_Of_Formal
);
10375 -- No further formals to match, but the generic part may
10376 -- contain inherited operation that are not hidden in the
10377 -- enclosing instance.
10379 Next_Entity
(Actual_Ent
);
10383 -- Inherited subprograms generated by formal derived types are
10384 -- also visible if the types are.
10386 Actual_Ent
:= First_Entity
(Actual_Pack
);
10387 while Present
(Actual_Ent
)
10388 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10390 if Is_Overloadable
(Actual_Ent
)
10392 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
10394 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
10396 Set_Is_Hidden
(Actual_Ent
, False);
10397 Set_Is_Potentially_Use_Visible
10398 (Actual_Ent
, In_Use
(Actual_Pack
));
10401 Next_Entity
(Actual_Ent
);
10405 -- If the formal is not declared with a box, reanalyze it as an
10406 -- abbreviated instantiation, to verify the matching rules of 12.7.
10407 -- The actual checks are performed after the generic associations
10408 -- have been analyzed, to guarantee the same visibility for this
10409 -- instantiation and for the actuals.
10411 -- In Ada 2005, the generic associations for the formal can include
10412 -- defaulted parameters. These are ignored during check. This
10413 -- internal instantiation is removed from the tree after conformance
10414 -- checking, because it contains formal declarations for those
10415 -- defaulted parameters, and those should not reach the back-end.
10417 if not Box_Present
(Formal
) then
10419 I_Pack
: constant Entity_Id
:=
10420 Make_Temporary
(Sloc
(Actual
), 'P');
10423 Set_Is_Internal
(I_Pack
);
10426 Make_Package_Instantiation
(Sloc
(Actual
),
10427 Defining_Unit_Name
=> I_Pack
,
10430 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
10431 Generic_Associations
=> Generic_Associations
(Formal
)));
10437 end Instantiate_Formal_Package
;
10439 -----------------------------------
10440 -- Instantiate_Formal_Subprogram --
10441 -----------------------------------
10443 function Instantiate_Formal_Subprogram
10446 Analyzed_Formal
: Node_Id
) return Node_Id
10448 Analyzed_S
: constant Entity_Id
:=
10449 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10450 Formal_Sub
: constant Entity_Id
:=
10451 Defining_Unit_Name
(Specification
(Formal
));
10453 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
10454 -- If the generic is a child unit, the parent has been installed on the
10455 -- scope stack, but a default subprogram cannot resolve to something
10456 -- on the parent because that parent is not really part of the visible
10457 -- context (it is there to resolve explicit local entities). If the
10458 -- default has resolved in this way, we remove the entity from immediate
10459 -- visibility and analyze the node again to emit an error message or
10460 -- find another visible candidate.
10462 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
10463 -- Perform legality check and raise exception on failure
10465 -----------------------
10466 -- From_Parent_Scope --
10467 -----------------------
10469 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
10470 Gen_Scope
: Node_Id
;
10473 Gen_Scope
:= Scope
(Analyzed_S
);
10474 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
10475 if Scope
(Subp
) = Scope
(Gen_Scope
) then
10479 Gen_Scope
:= Scope
(Gen_Scope
);
10483 end From_Parent_Scope
;
10485 -----------------------------
10486 -- Valid_Actual_Subprogram --
10487 -----------------------------
10489 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
10493 if Is_Entity_Name
(Act
) then
10494 Act_E
:= Entity
(Act
);
10496 elsif Nkind
(Act
) = N_Selected_Component
10497 and then Is_Entity_Name
(Selector_Name
(Act
))
10499 Act_E
:= Entity
(Selector_Name
(Act
));
10505 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
10506 or else Nkind_In
(Act
, N_Attribute_Reference
,
10507 N_Indexed_Component
,
10508 N_Character_Literal
,
10509 N_Explicit_Dereference
)
10515 ("expect subprogram or entry name in instantiation of &",
10516 Instantiation_Node
, Formal_Sub
);
10517 Abandon_Instantiation
(Instantiation_Node
);
10518 end Valid_Actual_Subprogram
;
10522 Decl_Node
: Node_Id
;
10525 New_Spec
: Node_Id
;
10526 New_Subp
: Entity_Id
;
10528 -- Start of processing for Instantiate_Formal_Subprogram
10531 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
10533 -- The tree copy has created the proper instantiation sloc for the
10534 -- new specification. Use this location for all other constructed
10537 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
10539 -- Create new entity for the actual (New_Copy_Tree does not), and
10540 -- indicate that it is an actual.
10542 New_Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
));
10543 Set_Ekind
(New_Subp
, Ekind
(Analyzed_S
));
10544 Set_Is_Generic_Actual_Subprogram
(New_Subp
);
10545 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
10547 -- Create new entities for the each of the formals in the specification
10548 -- of the renaming declaration built for the actual.
10550 if Present
(Parameter_Specifications
(New_Spec
)) then
10556 F
:= First
(Parameter_Specifications
(New_Spec
));
10557 while Present
(F
) loop
10558 F_Id
:= Defining_Identifier
(F
);
10560 Set_Defining_Identifier
(F
,
10561 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
10567 -- Find entity of actual. If the actual is an attribute reference, it
10568 -- cannot be resolved here (its formal is missing) but is handled
10569 -- instead in Attribute_Renaming. If the actual is overloaded, it is
10570 -- fully resolved subsequently, when the renaming declaration for the
10571 -- formal is analyzed. If it is an explicit dereference, resolve the
10572 -- prefix but not the actual itself, to prevent interpretation as call.
10574 if Present
(Actual
) then
10575 Loc
:= Sloc
(Actual
);
10576 Set_Sloc
(New_Spec
, Loc
);
10578 if Nkind
(Actual
) = N_Operator_Symbol
then
10579 Find_Direct_Name
(Actual
);
10581 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
10582 Analyze
(Prefix
(Actual
));
10584 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
10588 Valid_Actual_Subprogram
(Actual
);
10591 elsif Present
(Default_Name
(Formal
)) then
10592 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
10593 N_Selected_Component
,
10594 N_Indexed_Component
,
10595 N_Character_Literal
)
10596 and then Present
(Entity
(Default_Name
(Formal
)))
10598 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
10600 Nam
:= New_Copy
(Default_Name
(Formal
));
10601 Set_Sloc
(Nam
, Loc
);
10604 elsif Box_Present
(Formal
) then
10606 -- Actual is resolved at the point of instantiation. Create an
10607 -- identifier or operator with the same name as the formal.
10609 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
10611 Make_Operator_Symbol
(Loc
,
10612 Chars
=> Chars
(Formal_Sub
),
10613 Strval
=> No_String
);
10615 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
10618 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
10619 and then Null_Present
(Specification
(Formal
))
10621 -- Generate null body for procedure, for use in the instance
10624 Make_Subprogram_Body
(Loc
,
10625 Specification
=> New_Spec
,
10626 Declarations
=> New_List
,
10627 Handled_Statement_Sequence
=>
10628 Make_Handled_Sequence_Of_Statements
(Loc
,
10629 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
10631 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
10635 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
10637 ("missing actual&", Instantiation_Node
, Formal_Sub
);
10639 ("\in instantiation of & declared#",
10640 Instantiation_Node
, Scope
(Analyzed_S
));
10641 Abandon_Instantiation
(Instantiation_Node
);
10645 Make_Subprogram_Renaming_Declaration
(Loc
,
10646 Specification
=> New_Spec
,
10649 -- If we do not have an actual and the formal specified <> then set to
10650 -- get proper default.
10652 if No
(Actual
) and then Box_Present
(Formal
) then
10653 Set_From_Default
(Decl_Node
);
10656 -- Gather possible interpretations for the actual before analyzing the
10657 -- instance. If overloaded, it will be resolved when analyzing the
10658 -- renaming declaration.
10660 if Box_Present
(Formal
) and then No
(Actual
) then
10663 if Is_Child_Unit
(Scope
(Analyzed_S
))
10664 and then Present
(Entity
(Nam
))
10666 if not Is_Overloaded
(Nam
) then
10667 if From_Parent_Scope
(Entity
(Nam
)) then
10668 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
10669 Set_Entity
(Nam
, Empty
);
10670 Set_Etype
(Nam
, Empty
);
10673 Set_Is_Immediately_Visible
(Entity
(Nam
));
10682 Get_First_Interp
(Nam
, I
, It
);
10683 while Present
(It
.Nam
) loop
10684 if From_Parent_Scope
(It
.Nam
) then
10688 Get_Next_Interp
(I
, It
);
10695 -- The generic instantiation freezes the actual. This can only be done
10696 -- once the actual is resolved, in the analysis of the renaming
10697 -- declaration. To make the formal subprogram entity available, we set
10698 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
10699 -- This is also needed in Analyze_Subprogram_Renaming for the processing
10700 -- of formal abstract subprograms.
10702 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
10704 -- We cannot analyze the renaming declaration, and thus find the actual,
10705 -- until all the actuals are assembled in the instance. For subsequent
10706 -- checks of other actuals, indicate the node that will hold the
10707 -- instance of this formal.
10709 Set_Instance_Of
(Analyzed_S
, Nam
);
10711 if Nkind
(Actual
) = N_Selected_Component
10712 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
10713 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
10715 -- The renaming declaration will create a body, which must appear
10716 -- outside of the instantiation, We move the renaming declaration
10717 -- out of the instance, and create an additional renaming inside,
10718 -- to prevent freezing anomalies.
10721 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
10724 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
10725 Insert_Before
(Instantiation_Node
, Decl_Node
);
10726 Analyze
(Decl_Node
);
10728 -- Now create renaming within the instance
10731 Make_Subprogram_Renaming_Declaration
(Loc
,
10732 Specification
=> New_Copy_Tree
(New_Spec
),
10733 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
10735 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
10736 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
10741 end Instantiate_Formal_Subprogram
;
10743 ------------------------
10744 -- Instantiate_Object --
10745 ------------------------
10747 function Instantiate_Object
10750 Analyzed_Formal
: Node_Id
) return List_Id
10752 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
10753 A_Gen_Obj
: constant Entity_Id
:=
10754 Defining_Identifier
(Analyzed_Formal
);
10755 Acc_Def
: Node_Id
:= Empty
;
10756 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
10757 Actual_Decl
: Node_Id
:= Empty
;
10758 Decl_Node
: Node_Id
;
10761 List
: constant List_Id
:= New_List
;
10762 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10763 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
10764 Subt_Decl
: Node_Id
:= Empty
;
10765 Subt_Mark
: Node_Id
:= Empty
;
10767 function Copy_Access_Def
return Node_Id
;
10768 -- If formal is an anonymous access, copy access definition of formal
10769 -- for generated object declaration.
10771 ---------------------
10772 -- Copy_Access_Def --
10773 ---------------------
10775 function Copy_Access_Def
return Node_Id
is
10777 Def
:= New_Copy_Tree
(Acc_Def
);
10779 -- In addition, if formal is an access to subprogram we need to
10780 -- generate new formals for the signature of the default, so that
10781 -- the tree is properly formatted for ASIS use.
10783 if Present
(Access_To_Subprogram_Definition
(Acc_Def
)) then
10785 Par_Spec
: Node_Id
;
10788 First
(Parameter_Specifications
10789 (Access_To_Subprogram_Definition
(Def
)));
10790 while Present
(Par_Spec
) loop
10791 Set_Defining_Identifier
(Par_Spec
,
10792 Make_Defining_Identifier
(Sloc
(Acc_Def
),
10793 Chars
=> Chars
(Defining_Identifier
(Par_Spec
))));
10800 end Copy_Access_Def
;
10802 -- Start of processing for Instantiate_Object
10805 -- Formal may be an anonymous access
10807 if Present
(Subtype_Mark
(Formal
)) then
10808 Subt_Mark
:= Subtype_Mark
(Formal
);
10810 Check_Access_Definition
(Formal
);
10811 Acc_Def
:= Access_Definition
(Formal
);
10814 -- Sloc for error message on missing actual
10816 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
10818 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
10819 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
10822 Set_Parent
(List
, Parent
(Actual
));
10826 if Out_Present
(Formal
) then
10828 -- An IN OUT generic actual must be a name. The instantiation is a
10829 -- renaming declaration. The actual is the name being renamed. We
10830 -- use the actual directly, rather than a copy, because it is not
10831 -- used further in the list of actuals, and because a copy or a use
10832 -- of relocate_node is incorrect if the instance is nested within a
10833 -- generic. In order to simplify ASIS searches, the Generic_Parent
10834 -- field links the declaration to the generic association.
10836 if No
(Actual
) then
10838 ("missing actual &",
10839 Instantiation_Node
, Gen_Obj
);
10841 ("\in instantiation of & declared#",
10842 Instantiation_Node
, Scope
(A_Gen_Obj
));
10843 Abandon_Instantiation
(Instantiation_Node
);
10846 if Present
(Subt_Mark
) then
10848 Make_Object_Renaming_Declaration
(Loc
,
10849 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10850 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
10853 else pragma Assert
(Present
(Acc_Def
));
10855 Make_Object_Renaming_Declaration
(Loc
,
10856 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10857 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
10861 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10863 -- The analysis of the actual may produce Insert_Action nodes, so
10864 -- the declaration must have a context in which to attach them.
10866 Append
(Decl_Node
, List
);
10869 -- Return if the analysis of the actual reported some error
10871 if Etype
(Actual
) = Any_Type
then
10875 -- This check is performed here because Analyze_Object_Renaming will
10876 -- not check it when Comes_From_Source is False. Note though that the
10877 -- check for the actual being the name of an object will be performed
10878 -- in Analyze_Object_Renaming.
10880 if Is_Object_Reference
(Actual
)
10881 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
10884 ("illegal discriminant-dependent component for in out parameter",
10888 -- The actual has to be resolved in order to check that it is a
10889 -- variable (due to cases such as F (1), where F returns access to
10890 -- an array, and for overloaded prefixes).
10892 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
10894 -- If the type of the formal is not itself a formal, and the current
10895 -- unit is a child unit, the formal type must be declared in a
10896 -- parent, and must be retrieved by visibility.
10898 if Ftyp
= Orig_Ftyp
10899 and then Is_Generic_Unit
(Scope
(Ftyp
))
10900 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
10903 Temp
: constant Node_Id
:=
10904 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
10906 Set_Entity
(Temp
, Empty
);
10908 Ftyp
:= Entity
(Temp
);
10912 if Is_Private_Type
(Ftyp
)
10913 and then not Is_Private_Type
(Etype
(Actual
))
10914 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
10915 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
10917 -- If the actual has the type of the full view of the formal, or
10918 -- else a non-private subtype of the formal, then the visibility
10919 -- of the formal type has changed. Add to the actuals a subtype
10920 -- declaration that will force the exchange of views in the body
10921 -- of the instance as well.
10924 Make_Subtype_Declaration
(Loc
,
10925 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
10926 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
10928 Prepend
(Subt_Decl
, List
);
10930 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
10931 Exchange_Declarations
(Ftyp
);
10934 Resolve
(Actual
, Ftyp
);
10936 if not Denotes_Variable
(Actual
) then
10937 Error_Msg_NE
("actual for& must be a variable", Actual
, Gen_Obj
);
10939 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
10941 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
10942 -- the type of the actual shall resolve to a specific anonymous
10945 if Ada_Version
< Ada_2005
10946 or else Ekind
(Base_Type
(Ftyp
)) /=
10947 E_Anonymous_Access_Type
10948 or else Ekind
(Base_Type
(Etype
(Actual
))) /=
10949 E_Anonymous_Access_Type
10952 ("type of actual does not match type of&", Actual
, Gen_Obj
);
10956 Note_Possible_Modification
(Actual
, Sure
=> True);
10958 -- Check for instantiation of atomic/volatile actual for
10959 -- non-atomic/volatile formal (RM C.6 (12)).
10961 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
10963 ("cannot instantiate non-atomic formal object "
10964 & "with atomic actual", Actual
);
10966 elsif Is_Volatile_Object
(Actual
) and then not Is_Volatile
(Orig_Ftyp
)
10969 ("cannot instantiate non-volatile formal object "
10970 & "with volatile actual", Actual
);
10973 -- Formal in-parameter
10976 -- The instantiation of a generic formal in-parameter is constant
10977 -- declaration. The actual is the expression for that declaration.
10978 -- Its type is a full copy of the type of the formal. This may be
10979 -- an access to subprogram, for which we need to generate entities
10980 -- for the formals in the new signature.
10982 if Present
(Actual
) then
10983 if Present
(Subt_Mark
) then
10984 Def
:= New_Copy_Tree
(Subt_Mark
);
10985 else pragma Assert
(Present
(Acc_Def
));
10986 Def
:= Copy_Access_Def
;
10990 Make_Object_Declaration
(Loc
,
10991 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10992 Constant_Present
=> True,
10993 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
10994 Object_Definition
=> Def
,
10995 Expression
=> Actual
);
10997 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10999 -- A generic formal object of a tagged type is defined to be
11000 -- aliased so the new constant must also be treated as aliased.
11002 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
11003 Set_Aliased_Present
(Decl_Node
);
11006 Append
(Decl_Node
, List
);
11008 -- No need to repeat (pre-)analysis of some expression nodes
11009 -- already handled in Preanalyze_Actuals.
11011 if Nkind
(Actual
) /= N_Allocator
then
11014 -- Return if the analysis of the actual reported some error
11016 if Etype
(Actual
) = Any_Type
then
11022 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11026 Typ
:= Get_Instance_Of
(Formal_Type
);
11028 -- If the actual appears in the current or an enclosing scope,
11029 -- use its type directly. This is relevant if it has an actual
11030 -- subtype that is distinct from its nominal one. This cannot
11031 -- be done in general because the type of the actual may
11032 -- depend on other actuals, and only be fully determined when
11033 -- the enclosing instance is analyzed.
11035 if Present
(Etype
(Actual
))
11036 and then Is_Constr_Subt_For_U_Nominal
(Etype
(Actual
))
11038 Freeze_Before
(Instantiation_Node
, Etype
(Actual
));
11040 Freeze_Before
(Instantiation_Node
, Typ
);
11043 -- If the actual is an aggregate, perform name resolution on
11044 -- its components (the analysis of an aggregate does not do it)
11045 -- to capture local names that may be hidden if the generic is
11048 if Nkind
(Actual
) = N_Aggregate
then
11049 Preanalyze_And_Resolve
(Actual
, Typ
);
11052 if Is_Limited_Type
(Typ
)
11053 and then not OK_For_Limited_Init
(Typ
, Actual
)
11056 ("initialization not allowed for limited types", Actual
);
11057 Explain_Limited_Type
(Typ
, Actual
);
11061 elsif Present
(Default_Expression
(Formal
)) then
11063 -- Use default to construct declaration
11065 if Present
(Subt_Mark
) then
11066 Def
:= New_Copy
(Subt_Mark
);
11067 else pragma Assert
(Present
(Acc_Def
));
11068 Def
:= Copy_Access_Def
;
11072 Make_Object_Declaration
(Sloc
(Formal
),
11073 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11074 Constant_Present
=> True,
11075 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11076 Object_Definition
=> Def
,
11077 Expression
=> New_Copy_Tree
11078 (Default_Expression
(Formal
)));
11080 Append
(Decl_Node
, List
);
11081 Set_Analyzed
(Expression
(Decl_Node
), False);
11084 Error_Msg_NE
("missing actual&", Instantiation_Node
, Gen_Obj
);
11085 Error_Msg_NE
("\in instantiation of & declared#",
11086 Instantiation_Node
, Scope
(A_Gen_Obj
));
11088 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
11090 -- Create dummy constant declaration so that instance can be
11091 -- analyzed, to minimize cascaded visibility errors.
11093 if Present
(Subt_Mark
) then
11095 else pragma Assert
(Present
(Acc_Def
));
11100 Make_Object_Declaration
(Loc
,
11101 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11102 Constant_Present
=> True,
11103 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11104 Object_Definition
=> New_Copy
(Def
),
11106 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
11107 Attribute_Name
=> Name_First
,
11108 Prefix
=> New_Copy
(Def
)));
11110 Append
(Decl_Node
, List
);
11113 Abandon_Instantiation
(Instantiation_Node
);
11118 if Nkind
(Actual
) in N_Has_Entity
then
11119 Actual_Decl
:= Parent
(Entity
(Actual
));
11122 -- Ada 2005 (AI-423): For a formal object declaration with a null
11123 -- exclusion or an access definition that has a null exclusion: If the
11124 -- actual matching the formal object declaration denotes a generic
11125 -- formal object of another generic unit G, and the instantiation
11126 -- containing the actual occurs within the body of G or within the body
11127 -- of a generic unit declared within the declarative region of G, then
11128 -- the declaration of the formal object of G must have a null exclusion.
11129 -- Otherwise, the subtype of the actual matching the formal object
11130 -- declaration shall exclude null.
11132 if Ada_Version
>= Ada_2005
11133 and then Present
(Actual_Decl
)
11134 and then Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
11135 N_Object_Declaration
)
11136 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
11137 and then not Has_Null_Exclusion
(Actual_Decl
)
11138 and then Has_Null_Exclusion
(Analyzed_Formal
)
11140 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
11142 ("actual must exclude null to match generic formal#", Actual
);
11145 -- An effectively volatile object cannot be used as an actual in a
11146 -- generic instantiation (SPARK RM 7.1.3(7)). The following check is
11147 -- relevant only when SPARK_Mode is on as it is not a standard Ada
11148 -- legality rule, and also verifies that the actual is an object.
11151 and then Present
(Actual
)
11152 and then Is_Object_Reference
(Actual
)
11153 and then Is_Effectively_Volatile_Object
(Actual
)
11156 ("volatile object cannot act as actual in generic instantiation",
11161 end Instantiate_Object
;
11163 ------------------------------
11164 -- Instantiate_Package_Body --
11165 ------------------------------
11167 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11168 -- must be replaced by gotos which jump to the end of the routine in order
11169 -- to restore the Ghost and SPARK modes.
11171 procedure Instantiate_Package_Body
11172 (Body_Info
: Pending_Body_Info
;
11173 Inlined_Body
: Boolean := False;
11174 Body_Optional
: Boolean := False)
11176 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11177 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11178 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
11179 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11180 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11181 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11182 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11183 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11185 Saved_ISMP
: constant Boolean :=
11186 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11187 Saved_Style_Check
: constant Boolean := Style_Check
;
11189 procedure Check_Initialized_Types
;
11190 -- In a generic package body, an entity of a generic private type may
11191 -- appear uninitialized. This is suspicious, unless the actual is a
11192 -- fully initialized type.
11194 -----------------------------
11195 -- Check_Initialized_Types --
11196 -----------------------------
11198 procedure Check_Initialized_Types
is
11200 Formal
: Entity_Id
;
11201 Actual
: Entity_Id
;
11202 Uninit_Var
: Entity_Id
;
11205 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
11206 while Present
(Decl
) loop
11207 Uninit_Var
:= Empty
;
11209 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
11210 Uninit_Var
:= Uninitialized_Variable
(Decl
);
11212 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
11213 and then Nkind
(Formal_Type_Definition
(Decl
)) =
11214 N_Formal_Private_Type_Definition
11217 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
11220 if Present
(Uninit_Var
) then
11221 Formal
:= Defining_Identifier
(Decl
);
11222 Actual
:= First_Entity
(Act_Decl_Id
);
11224 -- For each formal there is a subtype declaration that renames
11225 -- the actual and has the same name as the formal. Locate the
11226 -- formal for warning message about uninitialized variables
11227 -- in the generic, for which the actual type should be a fully
11228 -- initialized type.
11230 while Present
(Actual
) loop
11231 exit when Ekind
(Actual
) = E_Package
11232 and then Present
(Renamed_Object
(Actual
));
11234 if Chars
(Actual
) = Chars
(Formal
)
11235 and then not Is_Scalar_Type
(Actual
)
11236 and then not Is_Fully_Initialized_Type
(Actual
)
11237 and then Warn_On_No_Value_Assigned
11239 Error_Msg_Node_2
:= Formal
;
11241 ("generic unit has uninitialized variable& of "
11242 & "formal private type &?v?", Actual
, Uninit_Var
);
11244 ("actual type for& should be fully initialized type?v?",
11249 Next_Entity
(Actual
);
11255 end Check_Initialized_Types
;
11259 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11260 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11261 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11262 -- Save the Ghost and SPARK mode-related data to restore on exit
11264 Act_Body
: Node_Id
;
11265 Act_Body_Id
: Entity_Id
;
11266 Act_Body_Name
: Node_Id
;
11267 Gen_Body
: Node_Id
;
11268 Gen_Body_Id
: Node_Id
;
11269 Par_Ent
: Entity_Id
:= Empty
;
11270 Par_Vis
: Boolean := False;
11271 Parent_Installed
: Boolean := False;
11273 Vis_Prims_List
: Elist_Id
:= No_Elist
;
11274 -- List of primitives made temporarily visible in the instantiation
11275 -- to match the visibility of the formal type.
11277 -- Start of processing for Instantiate_Package_Body
11280 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11282 -- The instance body may already have been processed, as the parent of
11283 -- another instance that is inlined (Load_Parent_Of_Generic).
11285 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
11289 -- The package being instantiated may be subject to pragma Ghost. Set
11290 -- the mode now to ensure that any nodes generated during instantiation
11291 -- are properly marked as Ghost.
11293 Set_Ghost_Mode
(Act_Decl_Id
);
11295 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11297 -- Re-establish the state of information on which checks are suppressed.
11298 -- This information was set in Body_Info at the point of instantiation,
11299 -- and now we restore it so that the instance is compiled using the
11300 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11302 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
11303 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
11304 Opt
.Ada_Version
:= Body_Info
.Version
;
11305 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
11306 Restore_Warnings
(Body_Info
.Warnings
);
11308 -- Install the SPARK mode which applies to the package body
11310 Install_SPARK_Mode
(Body_Info
.SPARK_Mode
, Body_Info
.SPARK_Mode_Pragma
);
11312 if No
(Gen_Body_Id
) then
11314 -- Do not look for parent of generic body if none is required.
11315 -- This may happen when the routine is called as part of the
11316 -- Pending_Instantiations processing, when nested instances
11317 -- may precede the one generated from the main unit.
11319 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
11320 and then Body_Optional
11324 Load_Parent_Of_Generic
11325 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
11326 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11330 -- Establish global variable for sloc adjustment and for error recovery
11331 -- In the case of an instance body for an instantiation with actuals
11332 -- from a limited view, the instance body is placed at the beginning
11333 -- of the enclosing package body: use the body entity as the source
11334 -- location for nodes of the instance body.
11336 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
)) then
11338 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
11339 Body_Id
: constant Node_Id
:=
11340 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
11343 Instantiation_Node
:= Body_Id
;
11346 Instantiation_Node
:= Inst_Node
;
11349 if Present
(Gen_Body_Id
) then
11350 Save_Env
(Gen_Unit
, Act_Decl_Id
);
11351 Style_Check
:= False;
11353 -- If the context of the instance is subject to SPARK_Mode "off", the
11354 -- annotation is missing, or the body is instantiated at a later pass
11355 -- and its spec ignored SPARK_Mode pragma, set the global flag which
11356 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
11359 if SPARK_Mode
/= On
11360 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
11362 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
11365 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
11366 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
11368 Create_Instantiation_Source
11369 (Inst_Node
, Gen_Body_Id
, S_Adjustment
);
11373 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
11375 -- Create proper (possibly qualified) defining name for the body, to
11376 -- correspond to the one in the spec.
11379 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
11380 Set_Comes_From_Source
(Act_Body_Id
, Comes_From_Source
(Act_Decl_Id
));
11382 -- Some attributes of spec entity are not inherited by body entity
11384 Set_Handler_Records
(Act_Body_Id
, No_List
);
11386 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
11387 N_Defining_Program_Unit_Name
11390 Make_Defining_Program_Unit_Name
(Loc
,
11392 New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
11393 Defining_Identifier
=> Act_Body_Id
);
11395 Act_Body_Name
:= Act_Body_Id
;
11398 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
11400 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
11401 Check_Generic_Actuals
(Act_Decl_Id
, False);
11402 Check_Initialized_Types
;
11404 -- Install primitives hidden at the point of the instantiation but
11405 -- visible when processing the generic formals
11411 E
:= First_Entity
(Act_Decl_Id
);
11412 while Present
(E
) loop
11414 and then not Is_Itype
(E
)
11415 and then Is_Generic_Actual_Type
(E
)
11416 and then Is_Tagged_Type
(E
)
11418 Install_Hidden_Primitives
11419 (Prims_List
=> Vis_Prims_List
,
11420 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
11428 -- If it is a child unit, make the parent instance (which is an
11429 -- instance of the parent of the generic) visible. The parent
11430 -- instance is the prefix of the name of the generic unit.
11432 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
11433 and then Nkind
(Gen_Id
) = N_Expanded_Name
11435 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
11436 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11437 Install_Parent
(Par_Ent
, In_Body
=> True);
11438 Parent_Installed
:= True;
11440 elsif Is_Child_Unit
(Gen_Unit
) then
11441 Par_Ent
:= Scope
(Gen_Unit
);
11442 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11443 Install_Parent
(Par_Ent
, In_Body
=> True);
11444 Parent_Installed
:= True;
11447 -- If the instantiation is a library unit, and this is the main unit,
11448 -- then build the resulting compilation unit nodes for the instance.
11449 -- If this is a compilation unit but it is not the main unit, then it
11450 -- is the body of a unit in the context, that is being compiled
11451 -- because it is encloses some inlined unit or another generic unit
11452 -- being instantiated. In that case, this body is not part of the
11453 -- current compilation, and is not attached to the tree, but its
11454 -- parent must be set for analysis.
11456 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11458 -- Replace instance node with body of instance, and create new
11459 -- node for corresponding instance declaration.
11461 Build_Instance_Compilation_Unit_Nodes
11462 (Inst_Node
, Act_Body
, Act_Decl
);
11463 Analyze
(Inst_Node
);
11465 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
11467 -- If the instance is a child unit itself, then set the scope
11468 -- of the expanded body to be the parent of the instantiation
11469 -- (ensuring that the fully qualified name will be generated
11470 -- for the elaboration subprogram).
11472 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
11473 N_Defining_Program_Unit_Name
11475 Set_Scope
(Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
11479 -- Case where instantiation is not a library unit
11482 -- If this is an early instantiation, i.e. appears textually
11483 -- before the corresponding body and must be elaborated first,
11484 -- indicate that the body instance is to be delayed.
11486 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
11488 -- Now analyze the body. We turn off all checks if this is an
11489 -- internal unit, since there is no reason to have checks on for
11490 -- any predefined run-time library code. All such code is designed
11491 -- to be compiled with checks off.
11493 -- Note that we do NOT apply this criterion to children of GNAT
11494 -- The latter units must suppress checks explicitly if needed.
11496 -- We also do not suppress checks in CodePeer mode where we are
11497 -- interested in finding possible runtime errors.
11499 if not CodePeer_Mode
11500 and then In_Predefined_Unit
(Gen_Decl
)
11502 Analyze
(Act_Body
, Suppress
=> All_Checks
);
11504 Analyze
(Act_Body
);
11508 Inherit_Context
(Gen_Body
, Inst_Node
);
11510 -- Remove the parent instances if they have been placed on the scope
11511 -- stack to compile the body.
11513 if Parent_Installed
then
11514 Remove_Parent
(In_Body
=> True);
11516 -- Restore the previous visibility of the parent
11518 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
11521 Restore_Hidden_Primitives
(Vis_Prims_List
);
11522 Restore_Private_Views
(Act_Decl_Id
);
11524 -- Remove the current unit from visibility if this is an instance
11525 -- that is not elaborated on the fly for inlining purposes.
11527 if not Inlined_Body
then
11528 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
11533 -- If we have no body, and the unit requires a body, then complain. This
11534 -- complaint is suppressed if we have detected other errors (since a
11535 -- common reason for missing the body is that it had errors).
11536 -- In CodePeer mode, a warning has been emitted already, no need for
11537 -- further messages.
11539 elsif Unit_Requires_Body
(Gen_Unit
)
11540 and then not Body_Optional
11542 if CodePeer_Mode
then
11545 elsif Serious_Errors_Detected
= 0 then
11547 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
11549 -- Don't attempt to perform any cleanup actions if some other error
11550 -- was already detected, since this can cause blowups.
11556 -- Case of package that does not need a body
11559 -- If the instantiation of the declaration is a library unit, rewrite
11560 -- the original package instantiation as a package declaration in the
11561 -- compilation unit node.
11563 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11564 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
11565 Rewrite
(Inst_Node
, Act_Decl
);
11567 -- Generate elaboration entity, in case spec has elaboration code.
11568 -- This cannot be done when the instance is analyzed, because it
11569 -- is not known yet whether the body exists.
11571 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
11572 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
11574 -- If the instantiation is not a library unit, then append the
11575 -- declaration to the list of implicitly generated entities, unless
11576 -- it is already a list member which means that it was already
11579 elsif not Is_List_Member
(Act_Decl
) then
11580 Mark_Rewrite_Insertion
(Act_Decl
);
11581 Insert_Before
(Inst_Node
, Act_Decl
);
11585 Expander_Mode_Restore
;
11588 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
11589 Restore_Ghost_Mode
(Saved_GM
);
11590 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
11591 Style_Check
:= Saved_Style_Check
;
11592 end Instantiate_Package_Body
;
11594 ---------------------------------
11595 -- Instantiate_Subprogram_Body --
11596 ---------------------------------
11598 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11599 -- must be replaced by gotos which jump to the end of the routine in order
11600 -- to restore the Ghost and SPARK modes.
11602 procedure Instantiate_Subprogram_Body
11603 (Body_Info
: Pending_Body_Info
;
11604 Body_Optional
: Boolean := False)
11606 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11607 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11608 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11609 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11610 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11611 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11612 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11613 Pack_Id
: constant Entity_Id
:=
11614 Defining_Unit_Name
(Parent
(Act_Decl
));
11616 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11617 Saved_ISMP
: constant Boolean :=
11618 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11619 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11620 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11621 -- Save the Ghost and SPARK mode-related data to restore on exit
11623 Saved_Style_Check
: constant Boolean := Style_Check
;
11624 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
11626 Act_Body
: Node_Id
;
11627 Act_Body_Id
: Entity_Id
;
11628 Gen_Body
: Node_Id
;
11629 Gen_Body_Id
: Node_Id
;
11630 Pack_Body
: Node_Id
;
11631 Par_Ent
: Entity_Id
:= Empty
;
11632 Par_Vis
: Boolean := False;
11633 Ret_Expr
: Node_Id
;
11635 Parent_Installed
: Boolean := False;
11638 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11640 -- Subprogram body may have been created already because of an inline
11641 -- pragma, or because of multiple elaborations of the enclosing package
11642 -- when several instances of the subprogram appear in the main unit.
11644 if Present
(Corresponding_Body
(Act_Decl
)) then
11648 -- The subprogram being instantiated may be subject to pragma Ghost. Set
11649 -- the mode now to ensure that any nodes generated during instantiation
11650 -- are properly marked as Ghost.
11652 Set_Ghost_Mode
(Act_Decl_Id
);
11654 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11656 -- Re-establish the state of information on which checks are suppressed.
11657 -- This information was set in Body_Info at the point of instantiation,
11658 -- and now we restore it so that the instance is compiled using the
11659 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11661 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
11662 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
11663 Opt
.Ada_Version
:= Body_Info
.Version
;
11664 Opt
.Ada_Version_Pragma
:= Body_Info
.Version_Pragma
;
11665 Restore_Warnings
(Body_Info
.Warnings
);
11667 -- Install the SPARK mode which applies to the subprogram body from the
11668 -- instantiation context. This may be refined further if an explicit
11669 -- SPARK_Mode pragma applies to the generic body.
11671 Install_SPARK_Mode
(Body_Info
.SPARK_Mode
, Body_Info
.SPARK_Mode_Pragma
);
11673 if No
(Gen_Body_Id
) then
11675 -- For imported generic subprogram, no body to compile, complete
11676 -- the spec entity appropriately.
11678 if Is_Imported
(Gen_Unit
) then
11679 Set_Is_Imported
(Act_Decl_Id
);
11680 Set_First_Rep_Item
(Act_Decl_Id
, First_Rep_Item
(Gen_Unit
));
11681 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
11682 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
11683 Set_Has_Completion
(Act_Decl_Id
);
11686 -- For other cases, compile the body
11689 Load_Parent_Of_Generic
11690 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
11691 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11695 Instantiation_Node
:= Inst_Node
;
11697 if Present
(Gen_Body_Id
) then
11698 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
11700 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
11702 -- Either body is not present, or context is non-expanding, as
11703 -- when compiling a subunit. Mark the instance as completed, and
11704 -- diagnose a missing body when needed.
11707 and then Operating_Mode
= Generate_Code
11709 Error_Msg_N
("missing proper body for instantiation", Gen_Body
);
11712 Set_Has_Completion
(Act_Decl_Id
);
11716 Save_Env
(Gen_Unit
, Act_Decl_Id
);
11717 Style_Check
:= False;
11719 -- If the context of the instance is subject to SPARK_Mode "off", the
11720 -- annotation is missing, or the body is instantiated at a later pass
11721 -- and its spec ignored SPARK_Mode pragma, set the global flag which
11722 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
11725 if SPARK_Mode
/= On
11726 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
11728 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
11731 -- If the context of an instance is not subject to SPARK_Mode "off",
11732 -- and the generic body is subject to an explicit SPARK_Mode pragma,
11733 -- the latter should be the one applicable to the instance.
11735 if not Ignore_SPARK_Mode_Pragmas_In_Instance
11736 and then SPARK_Mode
/= Off
11737 and then Present
(SPARK_Pragma
(Gen_Body_Id
))
11739 Set_SPARK_Mode
(Gen_Body_Id
);
11742 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
11743 Create_Instantiation_Source
11750 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
11752 -- Create proper defining name for the body, to correspond to the one
11756 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
11758 Set_Comes_From_Source
(Act_Body_Id
, Comes_From_Source
(Act_Decl_Id
));
11759 Set_Defining_Unit_Name
(Specification
(Act_Body
), Act_Body_Id
);
11761 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
11762 Set_Has_Completion
(Act_Decl_Id
);
11763 Check_Generic_Actuals
(Pack_Id
, False);
11765 -- Generate a reference to link the visible subprogram instance to
11766 -- the generic body, which for navigation purposes is the only
11767 -- available source for the instance.
11770 (Related_Instance
(Pack_Id
),
11771 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
11773 -- If it is a child unit, make the parent instance (which is an
11774 -- instance of the parent of the generic) visible. The parent
11775 -- instance is the prefix of the name of the generic unit.
11777 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
11778 and then Nkind
(Gen_Id
) = N_Expanded_Name
11780 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
11781 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11782 Install_Parent
(Par_Ent
, In_Body
=> True);
11783 Parent_Installed
:= True;
11785 elsif Is_Child_Unit
(Gen_Unit
) then
11786 Par_Ent
:= Scope
(Gen_Unit
);
11787 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11788 Install_Parent
(Par_Ent
, In_Body
=> True);
11789 Parent_Installed
:= True;
11792 -- Subprogram body is placed in the body of wrapper package,
11793 -- whose spec contains the subprogram declaration as well as
11794 -- the renaming declarations for the generic parameters.
11797 Make_Package_Body
(Loc
,
11798 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
11799 Declarations
=> New_List
(Act_Body
));
11801 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
11803 -- If the instantiation is a library unit, then build resulting
11804 -- compilation unit nodes for the instance. The declaration of
11805 -- the enclosing package is the grandparent of the subprogram
11806 -- declaration. First replace the instantiation node as the unit
11807 -- of the corresponding compilation.
11809 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11810 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
11811 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
11812 Build_Instance_Compilation_Unit_Nodes
11813 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
11814 Analyze
(Inst_Node
);
11816 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
11817 Analyze
(Pack_Body
);
11821 Insert_Before
(Inst_Node
, Pack_Body
);
11822 Mark_Rewrite_Insertion
(Pack_Body
);
11823 Analyze
(Pack_Body
);
11825 if Expander_Active
then
11826 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
11830 Inherit_Context
(Gen_Body
, Inst_Node
);
11832 Restore_Private_Views
(Pack_Id
, False);
11834 if Parent_Installed
then
11835 Remove_Parent
(In_Body
=> True);
11837 -- Restore the previous visibility of the parent
11839 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
11843 Restore_Warnings
(Saved_Warnings
);
11845 -- Body not found. Error was emitted already. If there were no previous
11846 -- errors, this may be an instance whose scope is a premature instance.
11847 -- In that case we must insure that the (legal) program does raise
11848 -- program error if executed. We generate a subprogram body for this
11849 -- purpose. See DEC ac30vso.
11851 -- Should not reference proprietary DEC tests in comments ???
11853 elsif Serious_Errors_Detected
= 0
11854 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
11856 if Body_Optional
then
11859 elsif Ekind
(Act_Decl_Id
) = E_Procedure
then
11861 Make_Subprogram_Body
(Loc
,
11863 Make_Procedure_Specification
(Loc
,
11864 Defining_Unit_Name
=>
11865 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
11866 Parameter_Specifications
=>
11868 (Parameter_Specifications
(Parent
(Act_Decl_Id
)))),
11870 Declarations
=> Empty_List
,
11871 Handled_Statement_Sequence
=>
11872 Make_Handled_Sequence_Of_Statements
(Loc
,
11873 Statements
=> New_List
(
11874 Make_Raise_Program_Error
(Loc
,
11875 Reason
=> PE_Access_Before_Elaboration
))));
11879 Make_Raise_Program_Error
(Loc
,
11880 Reason
=> PE_Access_Before_Elaboration
);
11882 Set_Etype
(Ret_Expr
, (Etype
(Act_Decl_Id
)));
11883 Set_Analyzed
(Ret_Expr
);
11886 Make_Subprogram_Body
(Loc
,
11888 Make_Function_Specification
(Loc
,
11889 Defining_Unit_Name
=>
11890 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
11891 Parameter_Specifications
=>
11893 (Parameter_Specifications
(Parent
(Act_Decl_Id
))),
11894 Result_Definition
=>
11895 New_Occurrence_Of
(Etype
(Act_Decl_Id
), Loc
)),
11897 Declarations
=> Empty_List
,
11898 Handled_Statement_Sequence
=>
11899 Make_Handled_Sequence_Of_Statements
(Loc
,
11900 Statements
=> New_List
(
11901 Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
11905 Make_Package_Body
(Loc
,
11906 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
11907 Declarations
=> New_List
(Act_Body
));
11909 Insert_After
(Inst_Node
, Pack_Body
);
11910 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
11911 Analyze
(Pack_Body
);
11914 Expander_Mode_Restore
;
11917 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
11918 Restore_Ghost_Mode
(Saved_GM
);
11919 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
11920 Style_Check
:= Saved_Style_Check
;
11921 end Instantiate_Subprogram_Body
;
11923 ----------------------
11924 -- Instantiate_Type --
11925 ----------------------
11927 function Instantiate_Type
11930 Analyzed_Formal
: Node_Id
;
11931 Actual_Decls
: List_Id
) return List_Id
11933 A_Gen_T
: constant Entity_Id
:=
11934 Defining_Identifier
(Analyzed_Formal
);
11935 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
11936 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
11938 Ancestor
: Entity_Id
:= Empty
;
11939 Decl_Node
: Node_Id
;
11940 Decl_Nodes
: List_Id
;
11944 procedure Diagnose_Predicated_Actual
;
11945 -- There are a number of constructs in which a discrete type with
11946 -- predicates is illegal, e.g. as an index in an array type declaration.
11947 -- If a generic type is used is such a construct in a generic package
11948 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
11949 -- of the generic contract that the actual cannot have predicates.
11951 procedure Validate_Array_Type_Instance
;
11952 procedure Validate_Access_Subprogram_Instance
;
11953 procedure Validate_Access_Type_Instance
;
11954 procedure Validate_Derived_Type_Instance
;
11955 procedure Validate_Derived_Interface_Type_Instance
;
11956 procedure Validate_Discriminated_Formal_Type
;
11957 procedure Validate_Interface_Type_Instance
;
11958 procedure Validate_Private_Type_Instance
;
11959 procedure Validate_Incomplete_Type_Instance
;
11960 -- These procedures perform validation tests for the named case.
11961 -- Validate_Discriminated_Formal_Type is shared by formal private
11962 -- types and Ada 2012 formal incomplete types.
11964 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
11965 -- Check that base types are the same and that the subtypes match
11966 -- statically. Used in several of the above.
11968 ---------------------------------
11969 -- Diagnose_Predicated_Actual --
11970 ---------------------------------
11972 procedure Diagnose_Predicated_Actual
is
11974 if No_Predicate_On_Actual
(A_Gen_T
)
11975 and then Has_Predicates
(Act_T
)
11978 ("actual for& cannot be a type with predicate",
11979 Instantiation_Node
, A_Gen_T
);
11981 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
11982 and then Has_Predicates
(Act_T
)
11983 and then not Has_Static_Predicate_Aspect
(Act_T
)
11986 ("actual for& cannot be a type with a dynamic predicate",
11987 Instantiation_Node
, A_Gen_T
);
11989 end Diagnose_Predicated_Actual
;
11991 --------------------
11992 -- Subtypes_Match --
11993 --------------------
11995 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
11996 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
11999 -- Some detailed comments would be useful here ???
12001 return ((Base_Type
(T
) = Act_T
12002 or else Base_Type
(T
) = Base_Type
(Act_T
))
12003 and then Subtypes_Statically_Match
(T
, Act_T
))
12005 or else (Is_Class_Wide_Type
(Gen_T
)
12006 and then Is_Class_Wide_Type
(Act_T
)
12007 and then Subtypes_Match
12008 (Get_Instance_Of
(Root_Type
(Gen_T
)),
12009 Root_Type
(Act_T
)))
12012 (Ekind_In
(Gen_T
, E_Anonymous_Access_Subprogram_Type
,
12013 E_Anonymous_Access_Type
)
12014 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
12015 and then Subtypes_Statically_Match
12016 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
12017 end Subtypes_Match
;
12019 -----------------------------------------
12020 -- Validate_Access_Subprogram_Instance --
12021 -----------------------------------------
12023 procedure Validate_Access_Subprogram_Instance
is
12025 if not Is_Access_Type
(Act_T
)
12026 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
12029 ("expect access type in instantiation of &", Actual
, Gen_T
);
12030 Abandon_Instantiation
(Actual
);
12033 -- According to AI05-288, actuals for access_to_subprograms must be
12034 -- subtype conformant with the generic formal. Previous to AI05-288
12035 -- only mode conformance was required.
12037 -- This is a binding interpretation that applies to previous versions
12038 -- of the language, no need to maintain previous weaker checks.
12040 Check_Subtype_Conformant
12041 (Designated_Type
(Act_T
),
12042 Designated_Type
(A_Gen_T
),
12046 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
12047 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
12049 ("protected access type not allowed for formal &",
12053 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
12055 ("expect protected access type for formal &",
12059 -- If the formal has a specified convention (which in most cases
12060 -- will be StdCall) verify that the actual has the same convention.
12062 if Has_Convention_Pragma
(A_Gen_T
)
12063 and then Convention
(A_Gen_T
) /= Convention
(Act_T
)
12065 Error_Msg_Name_1
:= Get_Convention_Name
(Convention
(A_Gen_T
));
12067 ("actual for formal & must have convention %", Actual
, Gen_T
);
12069 end Validate_Access_Subprogram_Instance
;
12071 -----------------------------------
12072 -- Validate_Access_Type_Instance --
12073 -----------------------------------
12075 procedure Validate_Access_Type_Instance
is
12076 Desig_Type
: constant Entity_Id
:=
12077 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
12078 Desig_Act
: Entity_Id
;
12081 if not Is_Access_Type
(Act_T
) then
12083 ("expect access type in instantiation of &", Actual
, Gen_T
);
12084 Abandon_Instantiation
(Actual
);
12087 if Is_Access_Constant
(A_Gen_T
) then
12088 if not Is_Access_Constant
(Act_T
) then
12090 ("actual type must be access-to-constant type", Actual
);
12091 Abandon_Instantiation
(Actual
);
12094 if Is_Access_Constant
(Act_T
) then
12096 ("actual type must be access-to-variable type", Actual
);
12097 Abandon_Instantiation
(Actual
);
12099 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
12100 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
12102 Error_Msg_N
-- CODEFIX
12103 ("actual must be general access type!", Actual
);
12104 Error_Msg_NE
-- CODEFIX
12105 ("add ALL to }!", Actual
, Act_T
);
12106 Abandon_Instantiation
(Actual
);
12110 -- The designated subtypes, that is to say the subtypes introduced
12111 -- by an access type declaration (and not by a subtype declaration)
12114 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
12116 -- The designated type may have been introduced through a limited_
12117 -- with clause, in which case retrieve the non-limited view. This
12118 -- applies to incomplete types as well as to class-wide types.
12120 if From_Limited_With
(Desig_Act
) then
12121 Desig_Act
:= Available_View
(Desig_Act
);
12124 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
12126 ("designated type of actual does not match that of formal &",
12129 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
12130 Error_Msg_N
("\predicates do not match", Actual
);
12133 Abandon_Instantiation
(Actual
);
12135 elsif Is_Access_Type
(Designated_Type
(Act_T
))
12136 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
12138 Is_Constrained
(Designated_Type
(Desig_Type
))
12141 ("designated type of actual does not match that of formal &",
12144 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
12145 Error_Msg_N
("\predicates do not match", Actual
);
12148 Abandon_Instantiation
(Actual
);
12151 -- Ada 2005: null-exclusion indicators of the two types must agree
12153 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
12155 ("non null exclusion of actual and formal & do not match",
12158 end Validate_Access_Type_Instance
;
12160 ----------------------------------
12161 -- Validate_Array_Type_Instance --
12162 ----------------------------------
12164 procedure Validate_Array_Type_Instance
is
12169 function Formal_Dimensions
return Nat
;
12170 -- Count number of dimensions in array type formal
12172 -----------------------
12173 -- Formal_Dimensions --
12174 -----------------------
12176 function Formal_Dimensions
return Nat
is
12181 if Nkind
(Def
) = N_Constrained_Array_Definition
then
12182 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
12184 Index
:= First
(Subtype_Marks
(Def
));
12187 while Present
(Index
) loop
12189 Next_Index
(Index
);
12193 end Formal_Dimensions
;
12195 -- Start of processing for Validate_Array_Type_Instance
12198 if not Is_Array_Type
(Act_T
) then
12200 ("expect array type in instantiation of &", Actual
, Gen_T
);
12201 Abandon_Instantiation
(Actual
);
12203 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
12204 if not (Is_Constrained
(Act_T
)) then
12206 ("expect constrained array in instantiation of &",
12208 Abandon_Instantiation
(Actual
);
12212 if Is_Constrained
(Act_T
) then
12214 ("expect unconstrained array in instantiation of &",
12216 Abandon_Instantiation
(Actual
);
12220 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
12222 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
12223 Abandon_Instantiation
(Actual
);
12226 I1
:= First_Index
(A_Gen_T
);
12227 I2
:= First_Index
(Act_T
);
12228 for J
in 1 .. Formal_Dimensions
loop
12230 -- If the indexes of the actual were given by a subtype_mark,
12231 -- the index was transformed into a range attribute. Retrieve
12232 -- the original type mark for checking.
12234 if Is_Entity_Name
(Original_Node
(I2
)) then
12235 T2
:= Entity
(Original_Node
(I2
));
12240 if not Subtypes_Match
12241 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
12244 ("index types of actual do not match those of formal &",
12246 Abandon_Instantiation
(Actual
);
12253 -- Check matching subtypes. Note that there are complex visibility
12254 -- issues when the generic is a child unit and some aspect of the
12255 -- generic type is declared in a parent unit of the generic. We do
12256 -- the test to handle this special case only after a direct check
12257 -- for static matching has failed. The case where both the component
12258 -- type and the array type are separate formals, and the component
12259 -- type is a private view may also require special checking in
12260 -- Subtypes_Match. Finally, we assume that a child instance where
12261 -- the component type comes from a formal of a parent instance is
12262 -- correct because the generic was correct. A more precise check
12263 -- seems too complex to install???
12266 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
12269 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
12270 Component_Type
(Act_T
))
12272 (not Inside_A_Generic
12273 and then Is_Child_Unit
(Scope
(Component_Type
(A_Gen_T
))))
12278 ("component subtype of actual does not match that of formal &",
12280 Abandon_Instantiation
(Actual
);
12283 if Has_Aliased_Components
(A_Gen_T
)
12284 and then not Has_Aliased_Components
(Act_T
)
12287 ("actual must have aliased components to match formal type &",
12290 end Validate_Array_Type_Instance
;
12292 -----------------------------------------------
12293 -- Validate_Derived_Interface_Type_Instance --
12294 -----------------------------------------------
12296 procedure Validate_Derived_Interface_Type_Instance
is
12297 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
12301 -- First apply interface instance checks
12303 Validate_Interface_Type_Instance
;
12305 -- Verify that immediate parent interface is an ancestor of
12309 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
12312 ("interface actual must include progenitor&", Actual
, Par
);
12315 -- Now verify that the actual includes all other ancestors of
12318 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
12319 while Present
(Elmt
) loop
12320 if not Interface_Present_In_Ancestor
12321 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
12324 ("interface actual must include progenitor&",
12325 Actual
, Node
(Elmt
));
12330 end Validate_Derived_Interface_Type_Instance
;
12332 ------------------------------------
12333 -- Validate_Derived_Type_Instance --
12334 ------------------------------------
12336 procedure Validate_Derived_Type_Instance
is
12337 Actual_Discr
: Entity_Id
;
12338 Ancestor_Discr
: Entity_Id
;
12341 -- If the parent type in the generic declaration is itself a previous
12342 -- formal type, then it is local to the generic and absent from the
12343 -- analyzed generic definition. In that case the ancestor is the
12344 -- instance of the formal (which must have been instantiated
12345 -- previously), unless the ancestor is itself a formal derived type.
12346 -- In this latter case (which is the subject of Corrigendum 8652/0038
12347 -- (AI-202) the ancestor of the formals is the ancestor of its
12348 -- parent. Otherwise, the analyzed generic carries the parent type.
12349 -- If the parent type is defined in a previous formal package, then
12350 -- the scope of that formal package is that of the generic type
12351 -- itself, and it has already been mapped into the corresponding type
12352 -- in the actual package.
12354 -- Common case: parent type defined outside of the generic
12356 if Is_Entity_Name
(Subtype_Mark
(Def
))
12357 and then Present
(Entity
(Subtype_Mark
(Def
)))
12359 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
12361 -- Check whether parent is defined in a previous formal package
12364 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
12367 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
12369 -- The type may be a local derivation, or a type extension of a
12370 -- previous formal, or of a formal of a parent package.
12372 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
12374 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
12376 -- Check whether the parent is another derived formal type in the
12377 -- same generic unit.
12379 if Etype
(A_Gen_T
) /= A_Gen_T
12380 and then Is_Generic_Type
(Etype
(A_Gen_T
))
12381 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
12382 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
12384 -- Locate ancestor of parent from the subtype declaration
12385 -- created for the actual.
12391 Decl
:= First
(Actual_Decls
);
12392 while Present
(Decl
) loop
12393 if Nkind
(Decl
) = N_Subtype_Declaration
12394 and then Chars
(Defining_Identifier
(Decl
)) =
12395 Chars
(Etype
(A_Gen_T
))
12397 Ancestor
:= Generic_Parent_Type
(Decl
);
12405 pragma Assert
(Present
(Ancestor
));
12407 -- The ancestor itself may be a previous formal that has been
12410 Ancestor
:= Get_Instance_Of
(Ancestor
);
12414 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
12417 -- Check whether parent is a previous formal of the current generic
12419 elsif Is_Derived_Type
(A_Gen_T
)
12420 and then Is_Generic_Type
(Etype
(A_Gen_T
))
12421 and then Scope
(A_Gen_T
) = Scope
(Etype
(A_Gen_T
))
12423 Ancestor
:= Get_Instance_Of
(First_Subtype
(Etype
(A_Gen_T
)));
12425 -- An unusual case: the actual is a type declared in a parent unit,
12426 -- but is not a formal type so there is no instance_of for it.
12427 -- Retrieve it by analyzing the record extension.
12429 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
12430 and then In_Open_Scopes
(Scope
(Act_T
))
12431 and then Is_Generic_Instance
(Scope
(Act_T
))
12433 Analyze
(Subtype_Mark
(Def
));
12434 Ancestor
:= Entity
(Subtype_Mark
(Def
));
12437 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
12440 -- If the formal derived type has pragma Preelaborable_Initialization
12441 -- then the actual type must have preelaborable initialization.
12443 if Known_To_Have_Preelab_Init
(A_Gen_T
)
12444 and then not Has_Preelaborable_Initialization
(Act_T
)
12447 ("actual for & must have preelaborable initialization",
12451 -- Ada 2005 (AI-251)
12453 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
12454 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
12456 ("(Ada 2005) expected type implementing & in instantiation",
12460 -- Finally verify that the (instance of) the ancestor is an ancestor
12463 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
12465 ("expect type derived from & in instantiation",
12466 Actual
, First_Subtype
(Ancestor
));
12467 Abandon_Instantiation
(Actual
);
12470 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
12471 -- that the formal type declaration has been rewritten as a private
12474 if Ada_Version
>= Ada_2005
12475 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
12476 and then Synchronized_Present
(Parent
(A_Gen_T
))
12478 -- The actual must be a synchronized tagged type
12480 if not Is_Tagged_Type
(Act_T
) then
12482 ("actual of synchronized type must be tagged", Actual
);
12483 Abandon_Instantiation
(Actual
);
12485 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
12486 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
12487 N_Derived_Type_Definition
12488 and then not Synchronized_Present
12489 (Type_Definition
(Parent
(Act_T
)))
12492 ("actual of synchronized type must be synchronized", Actual
);
12493 Abandon_Instantiation
(Actual
);
12497 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
12498 -- removes the second instance of the phrase "or allow pass by copy".
12500 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
12502 ("cannot have atomic actual type for non-atomic formal type",
12505 elsif Is_Volatile
(Act_T
) and then not Is_Volatile
(Ancestor
) then
12507 ("cannot have volatile actual type for non-volatile formal type",
12511 -- It should not be necessary to check for unknown discriminants on
12512 -- Formal, but for some reason Has_Unknown_Discriminants is false for
12513 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
12514 -- needs fixing. ???
12516 if Is_Definite_Subtype
(A_Gen_T
)
12517 and then not Unknown_Discriminants_Present
(Formal
)
12518 and then not Is_Definite_Subtype
(Act_T
)
12520 Error_Msg_N
("actual subtype must be constrained", Actual
);
12521 Abandon_Instantiation
(Actual
);
12524 if not Unknown_Discriminants_Present
(Formal
) then
12525 if Is_Constrained
(Ancestor
) then
12526 if not Is_Constrained
(Act_T
) then
12527 Error_Msg_N
("actual subtype must be constrained", Actual
);
12528 Abandon_Instantiation
(Actual
);
12531 -- Ancestor is unconstrained, Check if generic formal and actual
12532 -- agree on constrainedness. The check only applies to array types
12533 -- and discriminated types.
12535 elsif Is_Constrained
(Act_T
) then
12536 if Ekind
(Ancestor
) = E_Access_Type
12537 or else (not Is_Constrained
(A_Gen_T
)
12538 and then Is_Composite_Type
(A_Gen_T
))
12540 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
12541 Abandon_Instantiation
(Actual
);
12544 -- A class-wide type is only allowed if the formal has unknown
12547 elsif Is_Class_Wide_Type
(Act_T
)
12548 and then not Has_Unknown_Discriminants
(Ancestor
)
12551 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
12552 Abandon_Instantiation
(Actual
);
12554 -- Otherwise, the formal and actual must have the same number
12555 -- of discriminants and each discriminant of the actual must
12556 -- correspond to a discriminant of the formal.
12558 elsif Has_Discriminants
(Act_T
)
12559 and then not Has_Unknown_Discriminants
(Act_T
)
12560 and then Has_Discriminants
(Ancestor
)
12562 Actual_Discr
:= First_Discriminant
(Act_T
);
12563 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
12564 while Present
(Actual_Discr
)
12565 and then Present
(Ancestor_Discr
)
12567 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
12568 No
(Corresponding_Discriminant
(Actual_Discr
))
12571 ("discriminant & does not correspond "
12572 & "to ancestor discriminant", Actual
, Actual_Discr
);
12573 Abandon_Instantiation
(Actual
);
12576 Next_Discriminant
(Actual_Discr
);
12577 Next_Discriminant
(Ancestor_Discr
);
12580 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
12582 ("actual for & must have same number of discriminants",
12584 Abandon_Instantiation
(Actual
);
12587 -- This case should be caught by the earlier check for
12588 -- constrainedness, but the check here is added for completeness.
12590 elsif Has_Discriminants
(Act_T
)
12591 and then not Has_Unknown_Discriminants
(Act_T
)
12594 ("actual for & must not have discriminants", Actual
, Gen_T
);
12595 Abandon_Instantiation
(Actual
);
12597 elsif Has_Discriminants
(Ancestor
) then
12599 ("actual for & must have known discriminants", Actual
, Gen_T
);
12600 Abandon_Instantiation
(Actual
);
12603 if not Subtypes_Statically_Compatible
12604 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
12607 ("constraint on actual is incompatible with formal", Actual
);
12608 Abandon_Instantiation
(Actual
);
12612 -- If the formal and actual types are abstract, check that there
12613 -- are no abstract primitives of the actual type that correspond to
12614 -- nonabstract primitives of the formal type (second sentence of
12617 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
12618 Check_Abstract_Primitives
: declare
12619 Gen_Prims
: constant Elist_Id
:=
12620 Primitive_Operations
(A_Gen_T
);
12621 Gen_Elmt
: Elmt_Id
;
12622 Gen_Subp
: Entity_Id
;
12623 Anc_Subp
: Entity_Id
;
12624 Anc_Formal
: Entity_Id
;
12625 Anc_F_Type
: Entity_Id
;
12627 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
12628 Act_Elmt
: Elmt_Id
;
12629 Act_Subp
: Entity_Id
;
12630 Act_Formal
: Entity_Id
;
12631 Act_F_Type
: Entity_Id
;
12633 Subprograms_Correspond
: Boolean;
12635 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
12636 -- Returns true if T2 is derived directly or indirectly from
12637 -- T1, including derivations from interfaces. T1 and T2 are
12638 -- required to be specific tagged base types.
12640 ------------------------
12641 -- Is_Tagged_Ancestor --
12642 ------------------------
12644 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
12646 Intfc_Elmt
: Elmt_Id
;
12649 -- The predicate is satisfied if the types are the same
12654 -- If we've reached the top of the derivation chain then
12655 -- we know that T1 is not an ancestor of T2.
12657 elsif Etype
(T2
) = T2
then
12660 -- Proceed to check T2's immediate parent
12662 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
12665 -- Finally, check to see if T1 is an ancestor of any of T2's
12669 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
12670 while Present
(Intfc_Elmt
) loop
12671 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
12675 Next_Elmt
(Intfc_Elmt
);
12680 end Is_Tagged_Ancestor
;
12682 -- Start of processing for Check_Abstract_Primitives
12685 -- Loop over all of the formal derived type's primitives
12687 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
12688 while Present
(Gen_Elmt
) loop
12689 Gen_Subp
:= Node
(Gen_Elmt
);
12691 -- If the primitive of the formal is not abstract, then
12692 -- determine whether there is a corresponding primitive of
12693 -- the actual type that's abstract.
12695 if not Is_Abstract_Subprogram
(Gen_Subp
) then
12696 Act_Elmt
:= First_Elmt
(Act_Prims
);
12697 while Present
(Act_Elmt
) loop
12698 Act_Subp
:= Node
(Act_Elmt
);
12700 -- If we find an abstract primitive of the actual,
12701 -- then we need to test whether it corresponds to the
12702 -- subprogram from which the generic formal primitive
12705 if Is_Abstract_Subprogram
(Act_Subp
) then
12706 Anc_Subp
:= Alias
(Gen_Subp
);
12708 -- Test whether we have a corresponding primitive
12709 -- by comparing names, kinds, formal types, and
12712 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
12713 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
12715 Anc_Formal
:= First_Formal
(Anc_Subp
);
12716 Act_Formal
:= First_Formal
(Act_Subp
);
12717 while Present
(Anc_Formal
)
12718 and then Present
(Act_Formal
)
12720 Anc_F_Type
:= Etype
(Anc_Formal
);
12721 Act_F_Type
:= Etype
(Act_Formal
);
12723 if Ekind
(Anc_F_Type
) =
12724 E_Anonymous_Access_Type
12726 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
12728 if Ekind
(Act_F_Type
) =
12729 E_Anonymous_Access_Type
12732 Designated_Type
(Act_F_Type
);
12738 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
12743 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
12744 Act_F_Type
:= Base_Type
(Act_F_Type
);
12746 -- If the formal is controlling, then the
12747 -- the type of the actual primitive's formal
12748 -- must be derived directly or indirectly
12749 -- from the type of the ancestor primitive's
12752 if Is_Controlling_Formal
(Anc_Formal
) then
12753 if not Is_Tagged_Ancestor
12754 (Anc_F_Type
, Act_F_Type
)
12759 -- Otherwise the types of the formals must
12762 elsif Anc_F_Type
/= Act_F_Type
then
12766 Next_Entity
(Anc_Formal
);
12767 Next_Entity
(Act_Formal
);
12770 -- If we traversed through all of the formals
12771 -- then so far the subprograms correspond, so
12772 -- now check that any result types correspond.
12774 if No
(Anc_Formal
) and then No
(Act_Formal
) then
12775 Subprograms_Correspond
:= True;
12777 if Ekind
(Act_Subp
) = E_Function
then
12778 Anc_F_Type
:= Etype
(Anc_Subp
);
12779 Act_F_Type
:= Etype
(Act_Subp
);
12781 if Ekind
(Anc_F_Type
) =
12782 E_Anonymous_Access_Type
12785 Designated_Type
(Anc_F_Type
);
12787 if Ekind
(Act_F_Type
) =
12788 E_Anonymous_Access_Type
12791 Designated_Type
(Act_F_Type
);
12793 Subprograms_Correspond
:= False;
12798 = E_Anonymous_Access_Type
12800 Subprograms_Correspond
:= False;
12803 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
12804 Act_F_Type
:= Base_Type
(Act_F_Type
);
12806 -- Now either the result types must be
12807 -- the same or, if the result type is
12808 -- controlling, the result type of the
12809 -- actual primitive must descend from the
12810 -- result type of the ancestor primitive.
12812 if Subprograms_Correspond
12813 and then Anc_F_Type
/= Act_F_Type
12815 Has_Controlling_Result
(Anc_Subp
)
12816 and then not Is_Tagged_Ancestor
12817 (Anc_F_Type
, Act_F_Type
)
12819 Subprograms_Correspond
:= False;
12823 -- Found a matching subprogram belonging to
12824 -- formal ancestor type, so actual subprogram
12825 -- corresponds and this violates 3.9.3(9).
12827 if Subprograms_Correspond
then
12829 ("abstract subprogram & overrides "
12830 & "nonabstract subprogram of ancestor",
12837 Next_Elmt
(Act_Elmt
);
12841 Next_Elmt
(Gen_Elmt
);
12843 end Check_Abstract_Primitives
;
12846 -- Verify that limitedness matches. If parent is a limited
12847 -- interface then the generic formal is not unless declared
12848 -- explicitly so. If not declared limited, the actual cannot be
12849 -- limited (see AI05-0087).
12851 -- Even though this AI is a binding interpretation, we enable the
12852 -- check only in Ada 2012 mode, because this improper construct
12853 -- shows up in user code and in existing B-tests.
12855 if Is_Limited_Type
(Act_T
)
12856 and then not Is_Limited_Type
(A_Gen_T
)
12857 and then Ada_Version
>= Ada_2012
12859 if In_Instance
then
12863 ("actual for non-limited & cannot be a limited type",
12865 Explain_Limited_Type
(Act_T
, Actual
);
12866 Abandon_Instantiation
(Actual
);
12869 end Validate_Derived_Type_Instance
;
12871 ----------------------------------------
12872 -- Validate_Discriminated_Formal_Type --
12873 ----------------------------------------
12875 procedure Validate_Discriminated_Formal_Type
is
12876 Formal_Discr
: Entity_Id
;
12877 Actual_Discr
: Entity_Id
;
12878 Formal_Subt
: Entity_Id
;
12881 if Has_Discriminants
(A_Gen_T
) then
12882 if not Has_Discriminants
(Act_T
) then
12884 ("actual for & must have discriminants", Actual
, Gen_T
);
12885 Abandon_Instantiation
(Actual
);
12887 elsif Is_Constrained
(Act_T
) then
12889 ("actual for & must be unconstrained", Actual
, Gen_T
);
12890 Abandon_Instantiation
(Actual
);
12893 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
12894 Actual_Discr
:= First_Discriminant
(Act_T
);
12895 while Formal_Discr
/= Empty
loop
12896 if Actual_Discr
= Empty
then
12898 ("discriminants on actual do not match formal",
12900 Abandon_Instantiation
(Actual
);
12903 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
12905 -- Access discriminants match if designated types do
12907 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
12908 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
12909 E_Anonymous_Access_Type
12912 (Designated_Type
(Base_Type
(Formal_Subt
))) =
12913 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
12917 elsif Base_Type
(Formal_Subt
) /=
12918 Base_Type
(Etype
(Actual_Discr
))
12921 ("types of actual discriminants must match formal",
12923 Abandon_Instantiation
(Actual
);
12925 elsif not Subtypes_Statically_Match
12926 (Formal_Subt
, Etype
(Actual_Discr
))
12927 and then Ada_Version
>= Ada_95
12930 ("subtypes of actual discriminants must match formal",
12932 Abandon_Instantiation
(Actual
);
12935 Next_Discriminant
(Formal_Discr
);
12936 Next_Discriminant
(Actual_Discr
);
12939 if Actual_Discr
/= Empty
then
12941 ("discriminants on actual do not match formal",
12943 Abandon_Instantiation
(Actual
);
12947 end Validate_Discriminated_Formal_Type
;
12949 ---------------------------------------
12950 -- Validate_Incomplete_Type_Instance --
12951 ---------------------------------------
12953 procedure Validate_Incomplete_Type_Instance
is
12955 if not Is_Tagged_Type
(Act_T
)
12956 and then Is_Tagged_Type
(A_Gen_T
)
12959 ("actual for & must be a tagged type", Actual
, Gen_T
);
12962 Validate_Discriminated_Formal_Type
;
12963 end Validate_Incomplete_Type_Instance
;
12965 --------------------------------------
12966 -- Validate_Interface_Type_Instance --
12967 --------------------------------------
12969 procedure Validate_Interface_Type_Instance
is
12971 if not Is_Interface
(Act_T
) then
12973 ("actual for formal interface type must be an interface",
12976 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
12977 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
12978 or else Is_Protected_Interface
(A_Gen_T
) /=
12979 Is_Protected_Interface
(Act_T
)
12980 or else Is_Synchronized_Interface
(A_Gen_T
) /=
12981 Is_Synchronized_Interface
(Act_T
)
12984 ("actual for interface& does not match (RM 12.5.5(4))",
12987 end Validate_Interface_Type_Instance
;
12989 ------------------------------------
12990 -- Validate_Private_Type_Instance --
12991 ------------------------------------
12993 procedure Validate_Private_Type_Instance
is
12995 if Is_Limited_Type
(Act_T
)
12996 and then not Is_Limited_Type
(A_Gen_T
)
12998 if In_Instance
then
13002 ("actual for non-limited & cannot be a limited type", Actual
,
13004 Explain_Limited_Type
(Act_T
, Actual
);
13005 Abandon_Instantiation
(Actual
);
13008 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
13009 and then not Has_Preelaborable_Initialization
(Act_T
)
13012 ("actual for & must have preelaborable initialization", Actual
,
13015 elsif not Is_Definite_Subtype
(Act_T
)
13016 and then Is_Definite_Subtype
(A_Gen_T
)
13017 and then Ada_Version
>= Ada_95
13020 ("actual for & must be a definite subtype", Actual
, Gen_T
);
13022 elsif not Is_Tagged_Type
(Act_T
)
13023 and then Is_Tagged_Type
(A_Gen_T
)
13026 ("actual for & must be a tagged type", Actual
, Gen_T
);
13029 Validate_Discriminated_Formal_Type
;
13031 end Validate_Private_Type_Instance
;
13033 -- Start of processing for Instantiate_Type
13036 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
13037 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
13038 return New_List
(Error
);
13040 elsif not Is_Entity_Name
(Actual
)
13041 or else not Is_Type
(Entity
(Actual
))
13044 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
13045 Abandon_Instantiation
(Actual
);
13048 Act_T
:= Entity
(Actual
);
13050 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
13051 -- as a generic actual parameter if the corresponding formal type
13052 -- does not have a known_discriminant_part, or is a formal derived
13053 -- type that is an Unchecked_Union type.
13055 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
13056 if not Has_Discriminants
(A_Gen_T
)
13057 or else (Is_Derived_Type
(A_Gen_T
)
13058 and then Is_Unchecked_Union
(A_Gen_T
))
13062 Error_Msg_N
("unchecked union cannot be the actual for a "
13063 & "discriminated formal type", Act_T
);
13068 -- Deal with fixed/floating restrictions
13070 if Is_Floating_Point_Type
(Act_T
) then
13071 Check_Restriction
(No_Floating_Point
, Actual
);
13072 elsif Is_Fixed_Point_Type
(Act_T
) then
13073 Check_Restriction
(No_Fixed_Point
, Actual
);
13076 -- Deal with error of using incomplete type as generic actual.
13077 -- This includes limited views of a type, even if the non-limited
13078 -- view may be available.
13080 if Ekind
(Act_T
) = E_Incomplete_Type
13081 or else (Is_Class_Wide_Type
(Act_T
)
13082 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
13084 -- If the formal is an incomplete type, the actual can be
13085 -- incomplete as well.
13087 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
13090 elsif Is_Class_Wide_Type
(Act_T
)
13091 or else No
(Full_View
(Act_T
))
13093 Error_Msg_N
("premature use of incomplete type", Actual
);
13094 Abandon_Instantiation
(Actual
);
13096 Act_T
:= Full_View
(Act_T
);
13097 Set_Entity
(Actual
, Act_T
);
13099 if Has_Private_Component
(Act_T
) then
13101 ("premature use of type with private component", Actual
);
13105 -- Deal with error of premature use of private type as generic actual
13107 elsif Is_Private_Type
(Act_T
)
13108 and then Is_Private_Type
(Base_Type
(Act_T
))
13109 and then not Is_Generic_Type
(Act_T
)
13110 and then not Is_Derived_Type
(Act_T
)
13111 and then No
(Full_View
(Root_Type
(Act_T
)))
13113 -- If the formal is an incomplete type, the actual can be
13114 -- private or incomplete as well.
13116 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
13119 Error_Msg_N
("premature use of private type", Actual
);
13122 elsif Has_Private_Component
(Act_T
) then
13124 ("premature use of type with private component", Actual
);
13127 Set_Instance_Of
(A_Gen_T
, Act_T
);
13129 -- If the type is generic, the class-wide type may also be used
13131 if Is_Tagged_Type
(A_Gen_T
)
13132 and then Is_Tagged_Type
(Act_T
)
13133 and then not Is_Class_Wide_Type
(A_Gen_T
)
13135 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
13136 Class_Wide_Type
(Act_T
));
13139 if not Is_Abstract_Type
(A_Gen_T
)
13140 and then Is_Abstract_Type
(Act_T
)
13143 ("actual of non-abstract formal cannot be abstract", Actual
);
13146 -- A generic scalar type is a first subtype for which we generate
13147 -- an anonymous base type. Indicate that the instance of this base
13148 -- is the base type of the actual.
13150 if Is_Scalar_Type
(A_Gen_T
) then
13151 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
13155 if Error_Posted
(Act_T
) then
13158 case Nkind
(Def
) is
13159 when N_Formal_Private_Type_Definition
=>
13160 Validate_Private_Type_Instance
;
13162 when N_Formal_Incomplete_Type_Definition
=>
13163 Validate_Incomplete_Type_Instance
;
13165 when N_Formal_Derived_Type_Definition
=>
13166 Validate_Derived_Type_Instance
;
13168 when N_Formal_Discrete_Type_Definition
=>
13169 if not Is_Discrete_Type
(Act_T
) then
13171 ("expect discrete type in instantiation of&",
13173 Abandon_Instantiation
(Actual
);
13176 Diagnose_Predicated_Actual
;
13178 when N_Formal_Signed_Integer_Type_Definition
=>
13179 if not Is_Signed_Integer_Type
(Act_T
) then
13181 ("expect signed integer type in instantiation of&",
13183 Abandon_Instantiation
(Actual
);
13186 Diagnose_Predicated_Actual
;
13188 when N_Formal_Modular_Type_Definition
=>
13189 if not Is_Modular_Integer_Type
(Act_T
) then
13191 ("expect modular type in instantiation of &",
13193 Abandon_Instantiation
(Actual
);
13196 Diagnose_Predicated_Actual
;
13198 when N_Formal_Floating_Point_Definition
=>
13199 if not Is_Floating_Point_Type
(Act_T
) then
13201 ("expect float type in instantiation of &", Actual
, Gen_T
);
13202 Abandon_Instantiation
(Actual
);
13205 when N_Formal_Ordinary_Fixed_Point_Definition
=>
13206 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
13208 ("expect ordinary fixed point type in instantiation of &",
13210 Abandon_Instantiation
(Actual
);
13213 when N_Formal_Decimal_Fixed_Point_Definition
=>
13214 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
13216 ("expect decimal type in instantiation of &",
13218 Abandon_Instantiation
(Actual
);
13221 when N_Array_Type_Definition
=>
13222 Validate_Array_Type_Instance
;
13224 when N_Access_To_Object_Definition
=>
13225 Validate_Access_Type_Instance
;
13227 when N_Access_Function_Definition
13228 | N_Access_Procedure_Definition
13230 Validate_Access_Subprogram_Instance
;
13232 when N_Record_Definition
=>
13233 Validate_Interface_Type_Instance
;
13235 when N_Derived_Type_Definition
=>
13236 Validate_Derived_Interface_Type_Instance
;
13239 raise Program_Error
;
13243 Subt
:= New_Copy
(Gen_T
);
13245 -- Use adjusted sloc of subtype name as the location for other nodes in
13246 -- the subtype declaration.
13248 Loc
:= Sloc
(Subt
);
13251 Make_Subtype_Declaration
(Loc
,
13252 Defining_Identifier
=> Subt
,
13253 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
13255 if Is_Private_Type
(Act_T
) then
13256 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
13258 elsif Is_Access_Type
(Act_T
)
13259 and then Is_Private_Type
(Designated_Type
(Act_T
))
13261 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
13264 -- In Ada 2012 the actual may be a limited view. Indicate that
13265 -- the local subtype must be treated as such.
13267 if From_Limited_With
(Act_T
) then
13268 Set_Ekind
(Subt
, E_Incomplete_Subtype
);
13269 Set_From_Limited_With
(Subt
);
13272 Decl_Nodes
:= New_List
(Decl_Node
);
13274 -- Flag actual derived types so their elaboration produces the
13275 -- appropriate renamings for the primitive operations of the ancestor.
13276 -- Flag actual for formal private types as well, to determine whether
13277 -- operations in the private part may override inherited operations.
13278 -- If the formal has an interface list, the ancestor is not the
13279 -- parent, but the analyzed formal that includes the interface
13280 -- operations of all its progenitors.
13282 -- Same treatment for formal private types, so we can check whether the
13283 -- type is tagged limited when validating derivations in the private
13284 -- part. (See AI05-096).
13286 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
13287 if Present
(Interface_List
(Def
)) then
13288 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
13290 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
13293 elsif Nkind_In
(Def
, N_Formal_Private_Type_Definition
,
13294 N_Formal_Incomplete_Type_Definition
)
13296 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
13299 -- If the actual is a synchronized type that implements an interface,
13300 -- the primitive operations are attached to the corresponding record,
13301 -- and we have to treat it as an additional generic actual, so that its
13302 -- primitive operations become visible in the instance. The task or
13303 -- protected type itself does not carry primitive operations.
13305 if Is_Concurrent_Type
(Act_T
)
13306 and then Is_Tagged_Type
(Act_T
)
13307 and then Present
(Corresponding_Record_Type
(Act_T
))
13308 and then Present
(Ancestor
)
13309 and then Is_Interface
(Ancestor
)
13312 Corr_Rec
: constant Entity_Id
:=
13313 Corresponding_Record_Type
(Act_T
);
13314 New_Corr
: Entity_Id
;
13315 Corr_Decl
: Node_Id
;
13318 New_Corr
:= Make_Temporary
(Loc
, 'S');
13320 Make_Subtype_Declaration
(Loc
,
13321 Defining_Identifier
=> New_Corr
,
13322 Subtype_Indication
=>
13323 New_Occurrence_Of
(Corr_Rec
, Loc
));
13324 Append_To
(Decl_Nodes
, Corr_Decl
);
13326 if Ekind
(Act_T
) = E_Task_Type
then
13327 Set_Ekind
(Subt
, E_Task_Subtype
);
13329 Set_Ekind
(Subt
, E_Protected_Subtype
);
13332 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
13333 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
13334 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
13338 -- For a floating-point type, capture dimension info if any, because
13339 -- the generated subtype declaration does not come from source and
13340 -- will not process dimensions.
13342 if Is_Floating_Point_Type
(Act_T
) then
13343 Copy_Dimensions
(Act_T
, Subt
);
13347 end Instantiate_Type
;
13349 ---------------------
13350 -- Is_In_Main_Unit --
13351 ---------------------
13353 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
13354 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
13355 Current_Unit
: Node_Id
;
13358 if Unum
= Main_Unit
then
13361 -- If the current unit is a subunit then it is either the main unit or
13362 -- is being compiled as part of the main unit.
13364 elsif Nkind
(N
) = N_Compilation_Unit
then
13365 return Nkind
(Unit
(N
)) = N_Subunit
;
13368 Current_Unit
:= Parent
(N
);
13369 while Present
(Current_Unit
)
13370 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
13372 Current_Unit
:= Parent
(Current_Unit
);
13375 -- The instantiation node is in the main unit, or else the current node
13376 -- (perhaps as the result of nested instantiations) is in the main unit,
13377 -- or in the declaration of the main unit, which in this last case must
13381 Current_Unit
= Cunit
(Main_Unit
)
13382 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
13383 or else (Present
(Current_Unit
)
13384 and then Present
(Library_Unit
(Current_Unit
))
13385 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
13386 end Is_In_Main_Unit
;
13388 ----------------------------
13389 -- Load_Parent_Of_Generic --
13390 ----------------------------
13392 procedure Load_Parent_Of_Generic
13395 Body_Optional
: Boolean := False)
13397 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
13398 Saved_Style_Check
: constant Boolean := Style_Check
;
13399 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
13400 True_Parent
: Node_Id
;
13401 Inst_Node
: Node_Id
;
13403 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
13405 procedure Collect_Previous_Instances
(Decls
: List_Id
);
13406 -- Collect all instantiations in the given list of declarations, that
13407 -- precede the generic that we need to load. If the bodies of these
13408 -- instantiations are available, we must analyze them, to ensure that
13409 -- the public symbols generated are the same when the unit is compiled
13410 -- to generate code, and when it is compiled in the context of a unit
13411 -- that needs a particular nested instance. This process is applied to
13412 -- both package and subprogram instances.
13414 --------------------------------
13415 -- Collect_Previous_Instances --
13416 --------------------------------
13418 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
13422 Decl
:= First
(Decls
);
13423 while Present
(Decl
) loop
13424 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
13427 -- If Decl is an instantiation, then record it as requiring
13428 -- instantiation of the corresponding body, except if it is an
13429 -- abbreviated instantiation generated internally for conformance
13430 -- checking purposes only for the case of a formal package
13431 -- declared without a box (see Instantiate_Formal_Package). Such
13432 -- an instantiation does not generate any code (the actual code
13433 -- comes from actual) and thus does not need to be analyzed here.
13434 -- If the instantiation appears with a generic package body it is
13435 -- not analyzed here either.
13437 elsif Nkind
(Decl
) = N_Package_Instantiation
13438 and then not Is_Internal
(Defining_Entity
(Decl
))
13440 Append_Elmt
(Decl
, Previous_Instances
);
13442 -- For a subprogram instantiation, omit instantiations intrinsic
13443 -- operations (Unchecked_Conversions, etc.) that have no bodies.
13445 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
13446 N_Procedure_Instantiation
)
13447 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
13449 Append_Elmt
(Decl
, Previous_Instances
);
13451 elsif Nkind
(Decl
) = N_Package_Declaration
then
13452 Collect_Previous_Instances
13453 (Visible_Declarations
(Specification
(Decl
)));
13454 Collect_Previous_Instances
13455 (Private_Declarations
(Specification
(Decl
)));
13457 -- Previous non-generic bodies may contain instances as well
13459 elsif Nkind
(Decl
) = N_Package_Body
13460 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
13462 Collect_Previous_Instances
(Declarations
(Decl
));
13464 elsif Nkind
(Decl
) = N_Subprogram_Body
13465 and then not Acts_As_Spec
(Decl
)
13466 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
13468 Collect_Previous_Instances
(Declarations
(Decl
));
13473 end Collect_Previous_Instances
;
13475 -- Start of processing for Load_Parent_Of_Generic
13478 if not In_Same_Source_Unit
(N
, Spec
)
13479 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
13480 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
13481 and then not Is_In_Main_Unit
(Spec
))
13483 -- Find body of parent of spec, and analyze it. A special case arises
13484 -- when the parent is an instantiation, that is to say when we are
13485 -- currently instantiating a nested generic. In that case, there is
13486 -- no separate file for the body of the enclosing instance. Instead,
13487 -- the enclosing body must be instantiated as if it were a pending
13488 -- instantiation, in order to produce the body for the nested generic
13489 -- we require now. Note that in that case the generic may be defined
13490 -- in a package body, the instance defined in the same package body,
13491 -- and the original enclosing body may not be in the main unit.
13493 Inst_Node
:= Empty
;
13495 True_Parent
:= Parent
(Spec
);
13496 while Present
(True_Parent
)
13497 and then Nkind
(True_Parent
) /= N_Compilation_Unit
13499 if Nkind
(True_Parent
) = N_Package_Declaration
13501 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
13503 -- Parent is a compilation unit that is an instantiation.
13504 -- Instantiation node has been replaced with package decl.
13506 Inst_Node
:= Original_Node
(True_Parent
);
13509 elsif Nkind
(True_Parent
) = N_Package_Declaration
13510 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
13511 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
13513 -- Parent is an instantiation within another specification.
13514 -- Declaration for instance has been inserted before original
13515 -- instantiation node. A direct link would be preferable?
13517 Inst_Node
:= Next
(True_Parent
);
13518 while Present
(Inst_Node
)
13519 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
13524 -- If the instance appears within a generic, and the generic
13525 -- unit is defined within a formal package of the enclosing
13526 -- generic, there is no generic body available, and none
13527 -- needed. A more precise test should be used ???
13529 if No
(Inst_Node
) then
13536 True_Parent
:= Parent
(True_Parent
);
13540 -- Case where we are currently instantiating a nested generic
13542 if Present
(Inst_Node
) then
13543 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
13545 -- Instantiation node and declaration of instantiated package
13546 -- were exchanged when only the declaration was needed.
13547 -- Restore instantiation node before proceeding with body.
13549 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
13552 -- Now complete instantiation of enclosing body, if it appears in
13553 -- some other unit. If it appears in the current unit, the body
13554 -- will have been instantiated already.
13556 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
13558 -- We need to determine the expander mode to instantiate the
13559 -- enclosing body. Because the generic body we need may use
13560 -- global entities declared in the enclosing package (including
13561 -- aggregates) it is in general necessary to compile this body
13562 -- with expansion enabled, except if we are within a generic
13563 -- package, in which case the usual generic rule applies.
13566 Exp_Status
: Boolean := True;
13570 -- Loop through scopes looking for generic package
13572 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
13573 while Present
(Scop
)
13574 and then Scop
/= Standard_Standard
13576 if Ekind
(Scop
) = E_Generic_Package
then
13577 Exp_Status
:= False;
13581 Scop
:= Scope
(Scop
);
13584 -- Collect previous instantiations in the unit that contains
13585 -- the desired generic.
13587 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
13588 and then not Body_Optional
13592 Info
: Pending_Body_Info
;
13596 Par
:= Parent
(Inst_Node
);
13597 while Present
(Par
) loop
13598 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
13599 Par
:= Parent
(Par
);
13602 pragma Assert
(Present
(Par
));
13604 if Nkind
(Par
) = N_Package_Body
then
13605 Collect_Previous_Instances
(Declarations
(Par
));
13607 elsif Nkind
(Par
) = N_Package_Declaration
then
13608 Collect_Previous_Instances
13609 (Visible_Declarations
(Specification
(Par
)));
13610 Collect_Previous_Instances
13611 (Private_Declarations
(Specification
(Par
)));
13614 -- Enclosing unit is a subprogram body. In this
13615 -- case all instance bodies are processed in order
13616 -- and there is no need to collect them separately.
13621 Decl
:= First_Elmt
(Previous_Instances
);
13622 while Present
(Decl
) loop
13624 (Inst_Node
=> Node
(Decl
),
13626 Instance_Spec
(Node
(Decl
)),
13627 Expander_Status
=> Exp_Status
,
13628 Current_Sem_Unit
=>
13629 Get_Code_Unit
(Sloc
(Node
(Decl
))),
13630 Scope_Suppress
=> Scope_Suppress
,
13631 Local_Suppress_Stack_Top
=>
13632 Local_Suppress_Stack_Top
,
13633 Version
=> Ada_Version
,
13634 Version_Pragma
=> Ada_Version_Pragma
,
13635 Warnings
=> Save_Warnings
,
13636 SPARK_Mode
=> SPARK_Mode
,
13637 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
);
13639 -- Package instance
13641 if Nkind
(Node
(Decl
)) = N_Package_Instantiation
13643 Instantiate_Package_Body
13644 (Info
, Body_Optional
=> True);
13646 -- Subprogram instance
13649 -- The instance_spec is in the wrapper package,
13650 -- usually followed by its local renaming
13651 -- declaration. See Build_Subprogram_Renaming
13652 -- for details. If the instance carries aspects,
13653 -- these result in the corresponding pragmas,
13654 -- inserted after the subprogram declaration.
13655 -- They must be skipped as well when retrieving
13656 -- the desired spec. Some of them may have been
13657 -- rewritten as null statements.
13658 -- A direct link would be more robust ???
13662 (Last
(Visible_Declarations
13663 (Specification
(Info
.Act_Decl
))));
13665 while Nkind_In
(Decl
,
13668 N_Subprogram_Renaming_Declaration
)
13670 Decl
:= Prev
(Decl
);
13673 Info
.Act_Decl
:= Decl
;
13676 Instantiate_Subprogram_Body
13677 (Info
, Body_Optional
=> True);
13685 Instantiate_Package_Body
13687 ((Inst_Node
=> Inst_Node
,
13688 Act_Decl
=> True_Parent
,
13689 Expander_Status
=> Exp_Status
,
13690 Current_Sem_Unit
=> Get_Code_Unit
13691 (Sloc
(Inst_Node
)),
13692 Scope_Suppress
=> Scope_Suppress
,
13693 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
13694 Version
=> Ada_Version
,
13695 Version_Pragma
=> Ada_Version_Pragma
,
13696 Warnings
=> Save_Warnings
,
13697 SPARK_Mode
=> SPARK_Mode
,
13698 SPARK_Mode_Pragma
=> SPARK_Mode_Pragma
)),
13699 Body_Optional
=> Body_Optional
);
13703 -- Case where we are not instantiating a nested generic
13706 Opt
.Style_Check
:= False;
13707 Expander_Mode_Save_And_Set
(True);
13708 Load_Needed_Body
(Comp_Unit
, OK
);
13709 Opt
.Style_Check
:= Saved_Style_Check
;
13710 Restore_Warnings
(Saved_Warnings
);
13711 Expander_Mode_Restore
;
13714 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
13715 and then not Body_Optional
13718 Bname
: constant Unit_Name_Type
:=
13719 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
13722 -- In CodePeer mode, the missing body may make the analysis
13723 -- incomplete, but we do not treat it as fatal.
13725 if CodePeer_Mode
then
13729 Error_Msg_Unit_1
:= Bname
;
13730 Error_Msg_N
("this instantiation requires$!", N
);
13731 Error_Msg_File_1
:=
13732 Get_File_Name
(Bname
, Subunit
=> False);
13733 Error_Msg_N
("\but file{ was not found!", N
);
13734 raise Unrecoverable_Error
;
13741 -- If loading parent of the generic caused an instantiation circularity,
13742 -- we abandon compilation at this point, because otherwise in some cases
13743 -- we get into trouble with infinite recursions after this point.
13745 if Circularity_Detected
then
13746 raise Unrecoverable_Error
;
13748 end Load_Parent_Of_Generic
;
13750 ---------------------------------
13751 -- Map_Formal_Package_Entities --
13752 ---------------------------------
13754 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
13759 Set_Instance_Of
(Form
, Act
);
13761 -- Traverse formal and actual package to map the corresponding entities.
13762 -- We skip over internal entities that may be generated during semantic
13763 -- analysis, and find the matching entities by name, given that they
13764 -- must appear in the same order.
13766 E1
:= First_Entity
(Form
);
13767 E2
:= First_Entity
(Act
);
13768 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
13769 -- Could this test be a single condition??? Seems like it could, and
13770 -- isn't FPE (Form) a constant anyway???
13772 if not Is_Internal
(E1
)
13773 and then Present
(Parent
(E1
))
13774 and then not Is_Class_Wide_Type
(E1
)
13775 and then not Is_Internal_Name
(Chars
(E1
))
13777 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
13784 Set_Instance_Of
(E1
, E2
);
13786 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
13787 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
13790 if Is_Constrained
(E1
) then
13791 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
13794 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
13795 Map_Formal_Package_Entities
(E1
, E2
);
13802 end Map_Formal_Package_Entities
;
13804 -----------------------
13805 -- Move_Freeze_Nodes --
13806 -----------------------
13808 procedure Move_Freeze_Nodes
13809 (Out_Of
: Entity_Id
;
13814 Next_Decl
: Node_Id
;
13815 Next_Node
: Node_Id
:= After
;
13818 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
13819 -- Check whether entity is declared in a scope external to that of the
13822 -------------------
13823 -- Is_Outer_Type --
13824 -------------------
13826 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
13827 Scop
: Entity_Id
:= Scope
(T
);
13830 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
13834 while Scop
/= Standard_Standard
loop
13835 if Scop
= Out_Of
then
13838 Scop
:= Scope
(Scop
);
13846 -- Start of processing for Move_Freeze_Nodes
13853 -- First remove the freeze nodes that may appear before all other
13857 while Present
(Decl
)
13858 and then Nkind
(Decl
) = N_Freeze_Entity
13859 and then Is_Outer_Type
(Entity
(Decl
))
13861 Decl
:= Remove_Head
(L
);
13862 Insert_After
(Next_Node
, Decl
);
13863 Set_Analyzed
(Decl
, False);
13868 -- Next scan the list of declarations and remove each freeze node that
13869 -- appears ahead of the current node.
13871 while Present
(Decl
) loop
13872 while Present
(Next
(Decl
))
13873 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
13874 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
13876 Next_Decl
:= Remove_Next
(Decl
);
13877 Insert_After
(Next_Node
, Next_Decl
);
13878 Set_Analyzed
(Next_Decl
, False);
13879 Next_Node
:= Next_Decl
;
13882 -- If the declaration is a nested package or concurrent type, then
13883 -- recurse. Nested generic packages will have been processed from the
13886 case Nkind
(Decl
) is
13887 when N_Package_Declaration
=>
13888 Spec
:= Specification
(Decl
);
13890 when N_Task_Type_Declaration
=>
13891 Spec
:= Task_Definition
(Decl
);
13893 when N_Protected_Type_Declaration
=>
13894 Spec
:= Protected_Definition
(Decl
);
13900 if Present
(Spec
) then
13901 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
13902 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
13907 end Move_Freeze_Nodes
;
13913 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
13915 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
13918 ------------------------
13919 -- Preanalyze_Actuals --
13920 ------------------------
13922 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
) is
13925 Errs
: constant Nat
:= Serious_Errors_Detected
;
13927 Cur
: Entity_Id
:= Empty
;
13928 -- Current homograph of the instance name
13930 Vis
: Boolean := False;
13931 -- Saved visibility status of the current homograph
13934 Assoc
:= First
(Generic_Associations
(N
));
13936 -- If the instance is a child unit, its name may hide an outer homonym,
13937 -- so make it invisible to perform name resolution on the actuals.
13939 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
13941 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
13943 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
13945 if Is_Compilation_Unit
(Cur
) then
13946 Vis
:= Is_Immediately_Visible
(Cur
);
13947 Set_Is_Immediately_Visible
(Cur
, False);
13953 while Present
(Assoc
) loop
13954 if Nkind
(Assoc
) /= N_Others_Choice
then
13955 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
13957 -- Within a nested instantiation, a defaulted actual is an empty
13958 -- association, so nothing to analyze. If the subprogram actual
13959 -- is an attribute, analyze prefix only, because actual is not a
13960 -- complete attribute reference.
13962 -- If actual is an allocator, analyze expression only. The full
13963 -- analysis can generate code, and if instance is a compilation
13964 -- unit we have to wait until the package instance is installed
13965 -- to have a proper place to insert this code.
13967 -- String literals may be operators, but at this point we do not
13968 -- know whether the actual is a formal subprogram or a string.
13973 elsif Nkind
(Act
) = N_Attribute_Reference
then
13974 Analyze
(Prefix
(Act
));
13976 elsif Nkind
(Act
) = N_Explicit_Dereference
then
13977 Analyze
(Prefix
(Act
));
13979 elsif Nkind
(Act
) = N_Allocator
then
13981 Expr
: constant Node_Id
:= Expression
(Act
);
13984 if Nkind
(Expr
) = N_Subtype_Indication
then
13985 Analyze
(Subtype_Mark
(Expr
));
13987 -- Analyze separately each discriminant constraint, when
13988 -- given with a named association.
13994 Constr
:= First
(Constraints
(Constraint
(Expr
)));
13995 while Present
(Constr
) loop
13996 if Nkind
(Constr
) = N_Discriminant_Association
then
13997 Analyze
(Expression
(Constr
));
14011 elsif Nkind
(Act
) /= N_Operator_Symbol
then
14014 -- Within a package instance, mark actuals that are limited
14015 -- views, so their use can be moved to the body of the
14018 if Is_Entity_Name
(Act
)
14019 and then Is_Type
(Entity
(Act
))
14020 and then From_Limited_With
(Entity
(Act
))
14021 and then Present
(Inst
)
14023 Append_Elmt
(Entity
(Act
), Incomplete_Actuals
(Inst
));
14027 if Errs
/= Serious_Errors_Detected
then
14029 -- Do a minimal analysis of the generic, to prevent spurious
14030 -- warnings complaining about the generic being unreferenced,
14031 -- before abandoning the instantiation.
14033 Analyze
(Name
(N
));
14035 if Is_Entity_Name
(Name
(N
))
14036 and then Etype
(Name
(N
)) /= Any_Type
14038 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
14039 Set_Is_Instantiated
(Entity
(Name
(N
)));
14042 if Present
(Cur
) then
14044 -- For the case of a child instance hiding an outer homonym,
14045 -- provide additional warning which might explain the error.
14047 Set_Is_Immediately_Visible
(Cur
, Vis
);
14049 ("& hides outer unit with the same name??",
14050 N
, Defining_Unit_Name
(N
));
14053 Abandon_Instantiation
(Act
);
14060 if Present
(Cur
) then
14061 Set_Is_Immediately_Visible
(Cur
, Vis
);
14063 end Preanalyze_Actuals
;
14065 -------------------------------
14066 -- Provide_Completing_Bodies --
14067 -------------------------------
14069 procedure Provide_Completing_Bodies
(N
: Node_Id
) is
14070 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
);
14071 -- Generate the completing body for subprogram declaration Subp_Decl
14073 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
);
14074 -- Generating completing bodies for all subprograms found in declarative
14077 ---------------------------
14078 -- Build_Completing_Body --
14079 ---------------------------
14081 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
) is
14082 Loc
: constant Source_Ptr
:= Sloc
(Subp_Decl
);
14083 Subp_Id
: constant Entity_Id
:= Defining_Entity
(Subp_Decl
);
14087 -- Nothing to do if the subprogram already has a completing body
14089 if Present
(Corresponding_Body
(Subp_Decl
)) then
14092 -- Mark the function as having a valid return statement even though
14093 -- the body contains a single raise statement.
14095 elsif Ekind
(Subp_Id
) = E_Function
then
14096 Set_Return_Present
(Subp_Id
);
14099 -- Clone the specification to obtain new entities and reset the only
14102 Spec
:= Copy_Subprogram_Spec
(Specification
(Subp_Decl
));
14103 Set_Generic_Parent
(Spec
, Empty
);
14106 -- function Func ... return ... is
14108 -- procedure Proc ... is
14110 -- raise Program_Error with "access before elaboration";
14113 Insert_After_And_Analyze
(Subp_Decl
,
14114 Make_Subprogram_Body
(Loc
,
14115 Specification
=> Spec
,
14116 Declarations
=> New_List
,
14117 Handled_Statement_Sequence
=>
14118 Make_Handled_Sequence_Of_Statements
(Loc
,
14119 Statements
=> New_List
(
14120 Make_Raise_Program_Error
(Loc
,
14121 Reason
=> PE_Access_Before_Elaboration
)))));
14122 end Build_Completing_Body
;
14124 ----------------------------------
14125 -- Provide_Completing_Bodies_In --
14126 ----------------------------------
14128 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
) is
14132 if Present
(Decls
) then
14133 Decl
:= First
(Decls
);
14134 while Present
(Decl
) loop
14135 Provide_Completing_Bodies
(Decl
);
14139 end Provide_Completing_Bodies_In
;
14145 -- Start of processing for Provide_Completing_Bodies
14148 if Nkind
(N
) = N_Package_Declaration
then
14149 Spec
:= Specification
(N
);
14151 Push_Scope
(Defining_Entity
(N
));
14152 Provide_Completing_Bodies_In
(Visible_Declarations
(Spec
));
14153 Provide_Completing_Bodies_In
(Private_Declarations
(Spec
));
14156 elsif Nkind
(N
) = N_Subprogram_Declaration
then
14157 Build_Completing_Body
(N
);
14159 end Provide_Completing_Bodies
;
14161 -------------------
14162 -- Remove_Parent --
14163 -------------------
14165 procedure Remove_Parent
(In_Body
: Boolean := False) is
14166 S
: Entity_Id
:= Current_Scope
;
14167 -- S is the scope containing the instantiation just completed. The scope
14168 -- stack contains the parent instances of the instantiation, followed by
14177 -- After child instantiation is complete, remove from scope stack the
14178 -- extra copy of the current scope, and then remove parent instances.
14180 if not In_Body
then
14183 while Current_Scope
/= S
loop
14184 P
:= Current_Scope
;
14185 End_Package_Scope
(Current_Scope
);
14187 if In_Open_Scopes
(P
) then
14188 E
:= First_Entity
(P
);
14189 while Present
(E
) loop
14190 Set_Is_Immediately_Visible
(E
, True);
14194 -- If instantiation is declared in a block, it is the enclosing
14195 -- scope that might be a parent instance. Note that only one
14196 -- block can be involved, because the parent instances have
14197 -- been installed within it.
14199 if Ekind
(P
) = E_Block
then
14200 Cur_P
:= Scope
(P
);
14205 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
14206 -- We are within an instance of some sibling. Retain
14207 -- visibility of parent, for proper subsequent cleanup, and
14208 -- reinstall private declarations as well.
14210 Set_In_Private_Part
(P
);
14211 Install_Private_Declarations
(P
);
14214 -- If the ultimate parent is a top-level unit recorded in
14215 -- Instance_Parent_Unit, then reset its visibility to what it was
14216 -- before instantiation. (It's not clear what the purpose is of
14217 -- testing whether Scope (P) is In_Open_Scopes, but that test was
14218 -- present before the ultimate parent test was added.???)
14220 elsif not In_Open_Scopes
(Scope
(P
))
14221 or else (P
= Instance_Parent_Unit
14222 and then not Parent_Unit_Visible
)
14224 Set_Is_Immediately_Visible
(P
, False);
14226 -- If the current scope is itself an instantiation of a generic
14227 -- nested within P, and we are in the private part of body of this
14228 -- instantiation, restore the full views of P, that were removed
14229 -- in End_Package_Scope above. This obscure case can occur when a
14230 -- subunit of a generic contains an instance of a child unit of
14231 -- its generic parent unit.
14233 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
14235 Par
: constant Entity_Id
:=
14236 Generic_Parent
(Package_Specification
(S
));
14239 and then P
= Scope
(Par
)
14240 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
14242 Set_In_Private_Part
(P
);
14243 Install_Private_Declarations
(P
);
14249 -- Reset visibility of entities in the enclosing scope
14251 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
14253 Hidden
:= First_Elmt
(Hidden_Entities
);
14254 while Present
(Hidden
) loop
14255 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
14256 Next_Elmt
(Hidden
);
14260 -- Each body is analyzed separately, and there is no context that
14261 -- needs preserving from one body instance to the next, so remove all
14262 -- parent scopes that have been installed.
14264 while Present
(S
) loop
14265 End_Package_Scope
(S
);
14266 Set_Is_Immediately_Visible
(S
, False);
14267 S
:= Current_Scope
;
14268 exit when S
= Standard_Standard
;
14277 procedure Restore_Env
is
14278 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
14281 if No
(Current_Instantiated_Parent
.Act_Id
) then
14282 -- Restore environment after subprogram inlining
14284 Restore_Private_Views
(Empty
);
14287 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
14288 Exchanged_Views
:= Saved
.Exchanged_Views
;
14289 Hidden_Entities
:= Saved
.Hidden_Entities
;
14290 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
14291 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
14292 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
14294 Restore_Opt_Config_Switches
(Saved
.Switches
);
14296 Instance_Envs
.Decrement_Last
;
14299 ---------------------------
14300 -- Restore_Private_Views --
14301 ---------------------------
14303 procedure Restore_Private_Views
14304 (Pack_Id
: Entity_Id
;
14305 Is_Package
: Boolean := True)
14310 Dep_Elmt
: Elmt_Id
;
14313 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
14314 -- Hide the generic formals of formal packages declared with box which
14315 -- were reachable in the current instantiation.
14317 ---------------------------
14318 -- Restore_Nested_Formal --
14319 ---------------------------
14321 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
14325 if Present
(Renamed_Object
(Formal
))
14326 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
14330 elsif Present
(Associated_Formal_Package
(Formal
)) then
14331 Ent
:= First_Entity
(Formal
);
14332 while Present
(Ent
) loop
14333 exit when Ekind
(Ent
) = E_Package
14334 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
14336 Set_Is_Hidden
(Ent
);
14337 Set_Is_Potentially_Use_Visible
(Ent
, False);
14339 -- If package, then recurse
14341 if Ekind
(Ent
) = E_Package
then
14342 Restore_Nested_Formal
(Ent
);
14348 end Restore_Nested_Formal
;
14350 -- Start of processing for Restore_Private_Views
14353 M
:= First_Elmt
(Exchanged_Views
);
14354 while Present
(M
) loop
14357 -- Subtypes of types whose views have been exchanged, and that are
14358 -- defined within the instance, were not on the Private_Dependents
14359 -- list on entry to the instance, so they have to be exchanged
14360 -- explicitly now, in order to remain consistent with the view of the
14363 if Ekind_In
(Typ
, E_Private_Type
,
14364 E_Limited_Private_Type
,
14365 E_Record_Type_With_Private
)
14367 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
14368 while Present
(Dep_Elmt
) loop
14369 Dep_Typ
:= Node
(Dep_Elmt
);
14371 if Scope
(Dep_Typ
) = Pack_Id
14372 and then Present
(Full_View
(Dep_Typ
))
14374 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
14375 Exchange_Declarations
(Dep_Typ
);
14378 Next_Elmt
(Dep_Elmt
);
14382 Exchange_Declarations
(Node
(M
));
14386 if No
(Pack_Id
) then
14390 -- Make the generic formal parameters private, and make the formal types
14391 -- into subtypes of the actuals again.
14393 E
:= First_Entity
(Pack_Id
);
14394 while Present
(E
) loop
14395 Set_Is_Hidden
(E
, True);
14398 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
14400 -- If the actual for E is itself a generic actual type from
14401 -- an enclosing instance, E is still a generic actual type
14402 -- outside of the current instance. This matter when resolving
14403 -- an overloaded call that may be ambiguous in the enclosing
14404 -- instance, when two of its actuals coincide.
14406 if Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
14407 and then Is_Generic_Actual_Type
14408 (Entity
(Subtype_Indication
(Parent
(E
))))
14412 Set_Is_Generic_Actual_Type
(E
, False);
14415 -- An unusual case of aliasing: the actual may also be directly
14416 -- visible in the generic, and be private there, while it is fully
14417 -- visible in the context of the instance. The internal subtype
14418 -- is private in the instance but has full visibility like its
14419 -- parent in the enclosing scope. This enforces the invariant that
14420 -- the privacy status of all private dependents of a type coincide
14421 -- with that of the parent type. This can only happen when a
14422 -- generic child unit is instantiated within a sibling.
14424 if Is_Private_Type
(E
)
14425 and then not Is_Private_Type
(Etype
(E
))
14427 Exchange_Declarations
(E
);
14430 elsif Ekind
(E
) = E_Package
then
14432 -- The end of the renaming list is the renaming of the generic
14433 -- package itself. If the instance is a subprogram, all entities
14434 -- in the corresponding package are renamings. If this entity is
14435 -- a formal package, make its own formals private as well. The
14436 -- actual in this case is itself the renaming of an instantiation.
14437 -- If the entity is not a package renaming, it is the entity
14438 -- created to validate formal package actuals: ignore it.
14440 -- If the actual is itself a formal package for the enclosing
14441 -- generic, or the actual for such a formal package, it remains
14442 -- visible on exit from the instance, and therefore nothing needs
14443 -- to be done either, except to keep it accessible.
14445 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
14448 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
14452 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
14454 Set_Is_Hidden
(E
, False);
14458 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
14462 Id
:= First_Entity
(Act_P
);
14464 and then Id
/= First_Private_Entity
(Act_P
)
14466 exit when Ekind
(Id
) = E_Package
14467 and then Renamed_Object
(Id
) = Act_P
;
14469 Set_Is_Hidden
(Id
, True);
14470 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
14472 if Ekind
(Id
) = E_Package
then
14473 Restore_Nested_Formal
(Id
);
14484 end Restore_Private_Views
;
14491 (Gen_Unit
: Entity_Id
;
14492 Act_Unit
: Entity_Id
)
14496 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
14499 ----------------------------
14500 -- Save_Global_References --
14501 ----------------------------
14503 procedure Save_Global_References
(Templ
: Node_Id
) is
14505 -- ??? it is horrible to use global variables in highly recursive code
14508 -- The entity of the current associated node
14510 Gen_Scope
: Entity_Id
;
14511 -- The scope of the generic for which references are being saved
14514 -- The current associated node
14516 function Is_Global
(E
: Entity_Id
) return Boolean;
14517 -- Check whether entity is defined outside of generic unit. Examine the
14518 -- scope of an entity, and the scope of the scope, etc, until we find
14519 -- either Standard, in which case the entity is global, or the generic
14520 -- unit itself, which indicates that the entity is local. If the entity
14521 -- is the generic unit itself, as in the case of a recursive call, or
14522 -- the enclosing generic unit, if different from the current scope, then
14523 -- it is local as well, because it will be replaced at the point of
14524 -- instantiation. On the other hand, if it is a reference to a child
14525 -- unit of a common ancestor, which appears in an instantiation, it is
14526 -- global because it is used to denote a specific compilation unit at
14527 -- the time the instantiations will be analyzed.
14529 procedure Qualify_Universal_Operands
14531 Func_Call
: Node_Id
);
14532 -- Op denotes a binary or unary operator in generic template Templ. Node
14533 -- Func_Call is the function call alternative of the operator within the
14534 -- the analyzed copy of the template. Change each operand which yields a
14535 -- universal type by wrapping it into a qualified expression
14537 -- Actual_Typ'(Operand)
14539 -- where Actual_Typ is the type of corresponding actual parameter of
14540 -- Operand in Func_Call.
14542 procedure Reset_Entity
(N
: Node_Id
);
14543 -- Save semantic information on global entity so that it is not resolved
14544 -- again at instantiation time.
14546 procedure Save_Entity_Descendants
(N
: Node_Id
);
14547 -- Apply Save_Global_References to the two syntactic descendants of
14548 -- non-terminal nodes that carry an Associated_Node and are processed
14549 -- through Reset_Entity. Once the global entity (if any) has been
14550 -- captured together with its type, only two syntactic descendants need
14551 -- to be traversed to complete the processing of the tree rooted at N.
14552 -- This applies to Selected_Components, Expanded_Names, and to Operator
14553 -- nodes. N can also be a character literal, identifier, or operator
14554 -- symbol node, but the call has no effect in these cases.
14556 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
);
14557 -- Default actuals in nested instances must be handled specially
14558 -- because there is no link to them from the original tree. When an
14559 -- actual subprogram is given by a default, we add an explicit generic
14560 -- association for it in the instantiation node. When we save the
14561 -- global references on the name of the instance, we recover the list
14562 -- of generic associations, and add an explicit one to the original
14563 -- generic tree, through which a global actual can be preserved.
14564 -- Similarly, if a child unit is instantiated within a sibling, in the
14565 -- context of the parent, we must preserve the identifier of the parent
14566 -- so that it can be properly resolved in a subsequent instantiation.
14568 procedure Save_Global_Descendant
(D
: Union_Id
);
14569 -- Apply Save_References recursively to the descendants of node D
14571 procedure Save_References
(N
: Node_Id
);
14572 -- This is the recursive procedure that does the work, once the
14573 -- enclosing generic scope has been established.
14579 function Is_Global
(E
: Entity_Id
) return Boolean is
14582 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
14583 -- Determine whether the parent node of a reference to a child unit
14584 -- denotes an instantiation or a formal package, in which case the
14585 -- reference to the child unit is global, even if it appears within
14586 -- the current scope (e.g. when the instance appears within the body
14587 -- of an ancestor).
14589 ----------------------
14590 -- Is_Instance_Node --
14591 ----------------------
14593 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
14595 return Nkind
(Decl
) in N_Generic_Instantiation
14597 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
14598 end Is_Instance_Node
;
14600 -- Start of processing for Is_Global
14603 if E
= Gen_Scope
then
14606 elsif E
= Standard_Standard
then
14609 elsif Is_Child_Unit
(E
)
14610 and then (Is_Instance_Node
(Parent
(N2
))
14611 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
14612 and then N2
= Selector_Name
(Parent
(N2
))
14614 Is_Instance_Node
(Parent
(Parent
(N2
)))))
14620 while Se
/= Gen_Scope
loop
14621 if Se
= Standard_Standard
then
14632 --------------------------------
14633 -- Qualify_Universal_Operands --
14634 --------------------------------
14636 procedure Qualify_Universal_Operands
14638 Func_Call
: Node_Id
)
14640 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
);
14641 -- Rewrite operand Opnd as a qualified expression of the form
14643 -- Actual_Typ'(Opnd)
14645 -- where Actual is the corresponding actual parameter of Opnd in
14646 -- function call Func_Call.
14648 function Qualify_Type
14650 Typ
: Entity_Id
) return Node_Id
;
14651 -- Qualify type Typ by creating a selected component of the form
14653 -- Scope_Of_Typ.Typ
14655 ---------------------
14656 -- Qualify_Operand --
14657 ---------------------
14659 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
) is
14660 Loc
: constant Source_Ptr
:= Sloc
(Opnd
);
14661 Typ
: constant Entity_Id
:= Etype
(Actual
);
14666 -- Qualify the operand when it is of a universal type. Note that
14667 -- the template is unanalyzed and it is not possible to directly
14668 -- query the type. This transformation is not done when the type
14669 -- of the actual is internally generated because the type will be
14670 -- regenerated in the instance.
14672 if Yields_Universal_Type
(Opnd
)
14673 and then Comes_From_Source
(Typ
)
14674 and then not Is_Hidden
(Typ
)
14676 -- The type of the actual may be a global reference. Save this
14677 -- information by creating a reference to it.
14679 if Is_Global
(Typ
) then
14680 Mark
:= New_Occurrence_Of
(Typ
, Loc
);
14682 -- Otherwise rely on resolution to find the proper type within
14686 Mark
:= Qualify_Type
(Loc
, Typ
);
14690 Make_Qualified_Expression
(Loc
,
14691 Subtype_Mark
=> Mark
,
14692 Expression
=> Relocate_Node
(Opnd
));
14694 -- Mark the qualification to distinguish it from other source
14695 -- constructs and signal the instantiation mechanism that this
14696 -- node requires special processing. See Copy_Generic_Node for
14699 Set_Is_Qualified_Universal_Literal
(Qual
);
14701 Rewrite
(Opnd
, Qual
);
14703 end Qualify_Operand
;
14709 function Qualify_Type
14711 Typ
: Entity_Id
) return Node_Id
14713 Scop
: constant Entity_Id
:= Scope
(Typ
);
14717 Result
:= Make_Identifier
(Loc
, Chars
(Typ
));
14719 if Present
(Scop
) and then not Is_Generic_Unit
(Scop
) then
14721 Make_Selected_Component
(Loc
,
14722 Prefix
=> Make_Identifier
(Loc
, Chars
(Scop
)),
14723 Selector_Name
=> Result
);
14731 Actuals
: constant List_Id
:= Parameter_Associations
(Func_Call
);
14733 -- Start of processing for Qualify_Universal_Operands
14736 if Nkind
(Op
) in N_Binary_Op
then
14737 Qualify_Operand
(Left_Opnd
(Op
), First
(Actuals
));
14738 Qualify_Operand
(Right_Opnd
(Op
), Next
(First
(Actuals
)));
14740 elsif Nkind
(Op
) in N_Unary_Op
then
14741 Qualify_Operand
(Right_Opnd
(Op
), First
(Actuals
));
14743 end Qualify_Universal_Operands
;
14749 procedure Reset_Entity
(N
: Node_Id
) is
14750 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
14751 -- If the type of N2 is global to the generic unit, save the type in
14752 -- the generic node. Just as we perform name capture for explicit
14753 -- references within the generic, we must capture the global types
14754 -- of local entities because they may participate in resolution in
14757 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
14758 -- Find the ultimate ancestor of the current unit. If it is not a
14759 -- generic unit, then the name of the current unit in the prefix of
14760 -- an expanded name must be replaced with its generic homonym to
14761 -- ensure that it will be properly resolved in an instance.
14763 ---------------------
14764 -- Set_Global_Type --
14765 ---------------------
14767 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
14768 Typ
: constant Entity_Id
:= Etype
(N2
);
14771 Set_Etype
(N
, Typ
);
14773 -- If the entity of N is not the associated node, this is a
14774 -- nested generic and it has an associated node as well, whose
14775 -- type is already the full view (see below). Indicate that the
14776 -- original node has a private view.
14778 if Entity
(N
) /= N2
and then Has_Private_View
(Entity
(N
)) then
14779 Set_Has_Private_View
(N
);
14782 -- If not a private type, nothing else to do
14784 if not Is_Private_Type
(Typ
) then
14785 if Is_Array_Type
(Typ
)
14786 and then Is_Private_Type
(Component_Type
(Typ
))
14788 Set_Has_Private_View
(N
);
14791 -- If it is a derivation of a private type in a context where no
14792 -- full view is needed, nothing to do either.
14794 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
14797 -- Otherwise mark the type for flipping and use the full view when
14801 Set_Has_Private_View
(N
);
14803 if Present
(Full_View
(Typ
)) then
14804 Set_Etype
(N2
, Full_View
(Typ
));
14808 if Is_Floating_Point_Type
(Typ
)
14809 and then Has_Dimension_System
(Typ
)
14811 Copy_Dimensions
(N2
, N
);
14813 end Set_Global_Type
;
14819 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
14824 while Is_Child_Unit
(Par
) loop
14825 Par
:= Scope
(Par
);
14831 -- Start of processing for Reset_Entity
14834 N2
:= Get_Associated_Node
(N
);
14837 if Present
(E
) then
14839 -- If the node is an entry call to an entry in an enclosing task,
14840 -- it is rewritten as a selected component. No global entity to
14841 -- preserve in this case, since the expansion will be redone in
14844 if not Nkind_In
(E
, N_Defining_Character_Literal
,
14845 N_Defining_Identifier
,
14846 N_Defining_Operator_Symbol
)
14848 Set_Associated_Node
(N
, Empty
);
14849 Set_Etype
(N
, Empty
);
14853 -- If the entity is an itype created as a subtype of an access
14854 -- type with a null exclusion restore source entity for proper
14855 -- visibility. The itype will be created anew in the instance.
14858 and then Ekind
(E
) = E_Access_Subtype
14859 and then Is_Entity_Name
(N
)
14860 and then Chars
(Etype
(E
)) = Chars
(N
)
14863 Set_Entity
(N2
, E
);
14867 if Is_Global
(E
) then
14869 -- If the entity is a package renaming that is the prefix of
14870 -- an expanded name, it has been rewritten as the renamed
14871 -- package, which is necessary semantically but complicates
14872 -- ASIS tree traversal, so we recover the original entity to
14873 -- expose the renaming. Take into account that the context may
14874 -- be a nested generic, that the original node may itself have
14875 -- an associated node that had better be an entity, and that
14876 -- the current node is still a selected component.
14878 if Ekind
(E
) = E_Package
14879 and then Nkind
(N
) = N_Selected_Component
14880 and then Nkind
(Parent
(N
)) = N_Expanded_Name
14881 and then Present
(Original_Node
(N2
))
14882 and then Is_Entity_Name
(Original_Node
(N2
))
14883 and then Present
(Entity
(Original_Node
(N2
)))
14885 if Is_Global
(Entity
(Original_Node
(N2
))) then
14886 N2
:= Original_Node
(N2
);
14887 Set_Associated_Node
(N
, N2
);
14888 Set_Global_Type
(N
, N2
);
14890 -- Renaming is local, and will be resolved in instance
14893 Set_Associated_Node
(N
, Empty
);
14894 Set_Etype
(N
, Empty
);
14898 Set_Global_Type
(N
, N2
);
14901 elsif Nkind
(N
) = N_Op_Concat
14902 and then Is_Generic_Type
(Etype
(N2
))
14903 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
14905 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
14906 and then Is_Intrinsic_Subprogram
(E
)
14910 -- Entity is local. Mark generic node as unresolved. Note that now
14911 -- it does not have an entity.
14914 Set_Associated_Node
(N
, Empty
);
14915 Set_Etype
(N
, Empty
);
14918 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
14919 and then N
= Name
(Parent
(N
))
14921 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
14924 elsif Nkind
(Parent
(N
)) = N_Selected_Component
14925 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
14927 if Is_Global
(Entity
(Parent
(N2
))) then
14928 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
14929 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
14930 Set_Global_Type
(Parent
(N
), Parent
(N2
));
14931 Save_Entity_Descendants
(N
);
14933 -- If this is a reference to the current generic entity, replace
14934 -- by the name of the generic homonym of the current package. This
14935 -- is because in an instantiation Par.P.Q will not resolve to the
14936 -- name of the instance, whose enclosing scope is not necessarily
14937 -- Par. We use the generic homonym rather that the name of the
14938 -- generic itself because it may be hidden by a local declaration.
14940 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
14942 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
14944 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
14945 Rewrite
(Parent
(N
),
14946 Make_Identifier
(Sloc
(N
),
14948 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
14950 Rewrite
(Parent
(N
),
14951 Make_Identifier
(Sloc
(N
),
14952 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
14956 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
14957 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
14959 Save_Global_Defaults
14960 (Parent
(Parent
(N
)), Parent
(Parent
(N2
)));
14963 -- A selected component may denote a static constant that has been
14964 -- folded. If the static constant is global to the generic, capture
14965 -- its value. Otherwise the folding will happen in any instantiation.
14967 elsif Nkind
(Parent
(N
)) = N_Selected_Component
14968 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
14970 if Present
(Entity
(Original_Node
(Parent
(N2
))))
14971 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
14973 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
14974 Set_Analyzed
(Parent
(N
), False);
14977 -- A selected component may be transformed into a parameterless
14978 -- function call. If the called entity is global, rewrite the node
14979 -- appropriately, i.e. as an extended name for the global entity.
14981 elsif Nkind
(Parent
(N
)) = N_Selected_Component
14982 and then Nkind
(Parent
(N2
)) = N_Function_Call
14983 and then N
= Selector_Name
(Parent
(N
))
14985 if No
(Parameter_Associations
(Parent
(N2
))) then
14986 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
14987 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
14988 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
14989 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
14990 Save_Entity_Descendants
(N
);
14993 Set_Is_Prefixed_Call
(Parent
(N
));
14994 Set_Associated_Node
(N
, Empty
);
14995 Set_Etype
(N
, Empty
);
14998 -- In Ada 2005, X.F may be a call to a primitive operation,
14999 -- rewritten as F (X). This rewriting will be done again in an
15000 -- instance, so keep the original node. Global entities will be
15001 -- captured as for other constructs. Indicate that this must
15002 -- resolve as a call, to prevent accidental overloading in the
15003 -- instance, if both a component and a primitive operation appear
15007 Set_Is_Prefixed_Call
(Parent
(N
));
15010 -- Entity is local. Reset in generic unit, so that node is resolved
15011 -- anew at the point of instantiation.
15014 Set_Associated_Node
(N
, Empty
);
15015 Set_Etype
(N
, Empty
);
15019 -----------------------------
15020 -- Save_Entity_Descendants --
15021 -----------------------------
15023 procedure Save_Entity_Descendants
(N
: Node_Id
) is
15026 when N_Binary_Op
=>
15027 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
15028 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
15031 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
15033 when N_Expanded_Name
15034 | N_Selected_Component
15036 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
15037 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
15039 when N_Character_Literal
15041 | N_Operator_Symbol
15046 raise Program_Error
;
15048 end Save_Entity_Descendants
;
15050 --------------------------
15051 -- Save_Global_Defaults --
15052 --------------------------
15054 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
) is
15055 Loc
: constant Source_Ptr
:= Sloc
(N1
);
15056 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
15057 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
15064 Actual
: Entity_Id
;
15067 Assoc1
:= Generic_Associations
(N1
);
15069 if Present
(Assoc1
) then
15070 Act1
:= First
(Assoc1
);
15073 Set_Generic_Associations
(N1
, New_List
);
15074 Assoc1
:= Generic_Associations
(N1
);
15077 if Present
(Assoc2
) then
15078 Act2
:= First
(Assoc2
);
15083 while Present
(Act1
) and then Present
(Act2
) loop
15088 -- Find the associations added for default subprograms
15090 if Present
(Act2
) then
15091 while Nkind
(Act2
) /= N_Generic_Association
15092 or else No
(Entity
(Selector_Name
(Act2
)))
15093 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
15098 -- Add a similar association if the default is global. The
15099 -- renaming declaration for the actual has been analyzed, and
15100 -- its alias is the program it renames. Link the actual in the
15101 -- original generic tree with the node in the analyzed tree.
15103 while Present
(Act2
) loop
15104 Subp
:= Entity
(Selector_Name
(Act2
));
15105 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
15107 -- Following test is defence against rubbish errors
15109 if No
(Alias
(Subp
)) then
15113 -- Retrieve the resolved actual from the renaming declaration
15114 -- created for the instantiated formal.
15116 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
15117 Set_Entity
(Def
, Actual
);
15118 Set_Etype
(Def
, Etype
(Actual
));
15120 if Is_Global
(Actual
) then
15122 Make_Generic_Association
(Loc
,
15124 New_Occurrence_Of
(Subp
, Loc
),
15125 Explicit_Generic_Actual_Parameter
=>
15126 New_Occurrence_Of
(Actual
, Loc
));
15128 Set_Associated_Node
15129 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
15131 Append
(Ndec
, Assoc1
);
15133 -- If there are other defaults, add a dummy association in case
15134 -- there are other defaulted formals with the same name.
15136 elsif Present
(Next
(Act2
)) then
15138 Make_Generic_Association
(Loc
,
15140 New_Occurrence_Of
(Subp
, Loc
),
15141 Explicit_Generic_Actual_Parameter
=> Empty
);
15143 Append
(Ndec
, Assoc1
);
15150 if Nkind
(Name
(N1
)) = N_Identifier
15151 and then Is_Child_Unit
(Gen_Id
)
15152 and then Is_Global
(Gen_Id
)
15153 and then Is_Generic_Unit
(Scope
(Gen_Id
))
15154 and then In_Open_Scopes
(Scope
(Gen_Id
))
15156 -- This is an instantiation of a child unit within a sibling, so
15157 -- that the generic parent is in scope. An eventual instance must
15158 -- occur within the scope of an instance of the parent. Make name
15159 -- in instance into an expanded name, to preserve the identifier
15160 -- of the parent, so it can be resolved subsequently.
15162 Rewrite
(Name
(N2
),
15163 Make_Expanded_Name
(Loc
,
15164 Chars
=> Chars
(Gen_Id
),
15165 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
15166 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
15167 Set_Entity
(Name
(N2
), Gen_Id
);
15169 Rewrite
(Name
(N1
),
15170 Make_Expanded_Name
(Loc
,
15171 Chars
=> Chars
(Gen_Id
),
15172 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
15173 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
15175 Set_Associated_Node
(Name
(N1
), Name
(N2
));
15176 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
15177 Set_Associated_Node
15178 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
15179 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
15181 end Save_Global_Defaults
;
15183 ----------------------------
15184 -- Save_Global_Descendant --
15185 ----------------------------
15187 procedure Save_Global_Descendant
(D
: Union_Id
) is
15191 if D
in Node_Range
then
15192 if D
= Union_Id
(Empty
) then
15195 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
15196 Save_References
(Node_Id
(D
));
15199 elsif D
in List_Range
then
15200 pragma Assert
(D
/= Union_Id
(No_List
));
15201 -- Because No_List = Empty, which is in Node_Range above
15203 if Is_Empty_List
(List_Id
(D
)) then
15207 N1
:= First
(List_Id
(D
));
15208 while Present
(N1
) loop
15209 Save_References
(N1
);
15214 -- Element list or other non-node field, nothing to do
15219 end Save_Global_Descendant
;
15221 ---------------------
15222 -- Save_References --
15223 ---------------------
15225 -- This is the recursive procedure that does the work once the enclosing
15226 -- generic scope has been established. We have to treat specially a
15227 -- number of node rewritings that are required by semantic processing
15228 -- and which change the kind of nodes in the generic copy: typically
15229 -- constant-folding, replacing an operator node by a string literal, or
15230 -- a selected component by an expanded name. In each of those cases, the
15231 -- transformation is propagated to the generic unit.
15233 procedure Save_References
(N
: Node_Id
) is
15234 Loc
: constant Source_Ptr
:= Sloc
(N
);
15236 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean;
15237 -- Determine whether arbitrary node Nod requires delayed capture of
15238 -- global references within its aspect specifications.
15240 procedure Save_References_In_Aggregate
(N
: Node_Id
);
15241 -- Save all global references in [extension] aggregate node N
15243 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
);
15244 -- Save all global references in a character literal or operator
15245 -- symbol denoted by N.
15247 procedure Save_References_In_Descendants
(N
: Node_Id
);
15248 -- Save all global references in all descendants of node N
15250 procedure Save_References_In_Identifier
(N
: Node_Id
);
15251 -- Save all global references in identifier node N
15253 procedure Save_References_In_Operator
(N
: Node_Id
);
15254 -- Save all global references in operator node N
15256 procedure Save_References_In_Pragma
(Prag
: Node_Id
);
15257 -- Save all global references found within the expression of pragma
15260 ---------------------------
15261 -- Requires_Delayed_Save --
15262 ---------------------------
15264 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean is
15266 -- Generic packages and subprograms require delayed capture of
15267 -- global references within their aspects due to the timing of
15268 -- annotation analysis.
15270 if Nkind_In
(Nod
, N_Generic_Package_Declaration
,
15271 N_Generic_Subprogram_Declaration
,
15273 N_Package_Body_Stub
,
15275 N_Subprogram_Body_Stub
)
15277 -- Since the capture of global references is done on the
15278 -- unanalyzed generic template, there is no information around
15279 -- to infer the context. Use the Associated_Entity linkages to
15280 -- peek into the analyzed generic copy and determine what the
15281 -- template corresponds to.
15283 if Nod
= Templ
then
15285 Is_Generic_Declaration_Or_Body
15286 (Unit_Declaration_Node
15287 (Associated_Entity
(Defining_Entity
(Nod
))));
15289 -- Otherwise the generic unit being processed is not the top
15290 -- level template. It is safe to capture of global references
15291 -- within the generic unit because at this point the top level
15292 -- copy is fully analyzed.
15298 -- Otherwise capture the global references without interference
15303 end Requires_Delayed_Save
;
15305 ----------------------------------
15306 -- Save_References_In_Aggregate --
15307 ----------------------------------
15309 procedure Save_References_In_Aggregate
(N
: Node_Id
) is
15311 Qual
: Node_Id
:= Empty
;
15312 Typ
: Entity_Id
:= Empty
;
15314 use Atree
.Unchecked_Access
;
15315 -- This code section is part of implementing an untyped tree
15316 -- traversal, so it needs direct access to node fields.
15319 N2
:= Get_Associated_Node
(N
);
15321 if Present
(N2
) then
15324 -- In an instance within a generic, use the name of the actual
15325 -- and not the original generic parameter. If the actual is
15326 -- global in the current generic it must be preserved for its
15329 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
15330 and then Present
(Generic_Parent_Type
(Parent
(Typ
)))
15332 Typ
:= Base_Type
(Typ
);
15333 Set_Etype
(N2
, Typ
);
15337 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
15338 Set_Associated_Node
(N
, Empty
);
15340 -- If the aggregate is an actual in a call, it has been
15341 -- resolved in the current context, to some local type. The
15342 -- enclosing call may have been disambiguated by the aggregate,
15343 -- and this disambiguation might fail at instantiation time
15344 -- because the type to which the aggregate did resolve is not
15345 -- preserved. In order to preserve some of this information,
15346 -- wrap the aggregate in a qualified expression, using the id
15347 -- of its type. For further disambiguation we qualify the type
15348 -- name with its scope (if visible and not hidden by a local
15349 -- homograph) because both id's will have corresponding
15350 -- entities in an instance. This resolves most of the problems
15351 -- with missing type information on aggregates in instances.
15354 and then Nkind
(N2
) = Nkind
(N
)
15355 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
15356 and then Present
(Typ
)
15357 and then Comes_From_Source
(Typ
)
15359 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
15361 if Is_Immediately_Visible
(Scope
(Typ
))
15363 (not In_Open_Scopes
(Scope
(Typ
))
15364 or else Current_Entity
(Scope
(Typ
)) = Scope
(Typ
))
15367 Make_Selected_Component
(Loc
,
15369 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
15370 Selector_Name
=> Nam
);
15374 Make_Qualified_Expression
(Loc
,
15375 Subtype_Mark
=> Nam
,
15376 Expression
=> Relocate_Node
(N
));
15380 Save_Global_Descendant
(Field1
(N
));
15381 Save_Global_Descendant
(Field2
(N
));
15382 Save_Global_Descendant
(Field3
(N
));
15383 Save_Global_Descendant
(Field5
(N
));
15385 if Present
(Qual
) then
15388 end Save_References_In_Aggregate
;
15390 ----------------------------------------------
15391 -- Save_References_In_Char_Lit_Or_Op_Symbol --
15392 ----------------------------------------------
15394 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
) is
15396 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15399 elsif Nkind
(N
) = N_Operator_Symbol
15400 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
15402 Change_Operator_Symbol_To_String_Literal
(N
);
15404 end Save_References_In_Char_Lit_Or_Op_Symbol
;
15406 ------------------------------------
15407 -- Save_References_In_Descendants --
15408 ------------------------------------
15410 procedure Save_References_In_Descendants
(N
: Node_Id
) is
15411 use Atree
.Unchecked_Access
;
15412 -- This code section is part of implementing an untyped tree
15413 -- traversal, so it needs direct access to node fields.
15416 Save_Global_Descendant
(Field1
(N
));
15417 Save_Global_Descendant
(Field2
(N
));
15418 Save_Global_Descendant
(Field3
(N
));
15419 Save_Global_Descendant
(Field4
(N
));
15420 Save_Global_Descendant
(Field5
(N
));
15421 end Save_References_In_Descendants
;
15423 -----------------------------------
15424 -- Save_References_In_Identifier --
15425 -----------------------------------
15427 procedure Save_References_In_Identifier
(N
: Node_Id
) is
15429 -- The node did not undergo a transformation
15431 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15433 Aux_N2
: constant Node_Id
:= Get_Associated_Node
(N
);
15434 Orig_N2_Parent
: constant Node_Id
:=
15435 Original_Node
(Parent
(Aux_N2
));
15437 -- The parent of this identifier is a selected component
15438 -- which denotes a named number that was constant folded.
15439 -- Preserve the original name for ASIS and link the parent
15440 -- with its expanded name. The constant folding will be
15441 -- repeated in the instance.
15443 if Nkind
(Parent
(N
)) = N_Selected_Component
15444 and then Nkind_In
(Parent
(Aux_N2
), N_Integer_Literal
,
15446 and then Is_Entity_Name
(Orig_N2_Parent
)
15447 and then Ekind
(Entity
(Orig_N2_Parent
)) in Named_Kind
15448 and then Is_Global
(Entity
(Orig_N2_Parent
))
15451 Set_Associated_Node
15452 (Parent
(N
), Original_Node
(Parent
(N2
)));
15457 -- If this is a discriminant reference, always save it.
15458 -- It is used in the instance to find the corresponding
15459 -- discriminant positionally rather than by name.
15461 Set_Original_Discriminant
15462 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
15468 -- The analysis of the generic copy transformed the identifier
15469 -- into another construct. Propagate the changes to the template.
15472 N2
:= Get_Associated_Node
(N
);
15474 -- The identifier denotes a call to a parameterless function.
15475 -- Mark the node as resolved when the function is external.
15477 if Nkind
(N2
) = N_Function_Call
then
15478 E
:= Entity
(Name
(N2
));
15480 if Present
(E
) and then Is_Global
(E
) then
15481 Set_Etype
(N
, Etype
(N2
));
15483 Set_Associated_Node
(N
, Empty
);
15484 Set_Etype
(N
, Empty
);
15487 -- The identifier denotes a named number that was constant
15488 -- folded. Preserve the original name for ASIS and undo the
15489 -- constant folding which will be repeated in the instance.
15491 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
15492 and then Is_Entity_Name
(Original_Node
(N2
))
15494 Set_Associated_Node
(N
, Original_Node
(N2
));
15497 -- The identifier resolved to a string literal. Propagate this
15498 -- information to the generic template.
15500 elsif Nkind
(N2
) = N_String_Literal
then
15501 Rewrite
(N
, New_Copy
(N2
));
15503 -- The identifier is rewritten as a dereference if it is the
15504 -- prefix of an implicit dereference. Preserve the original
15505 -- tree as the analysis of the instance will expand the node
15506 -- again, but preserve the resolved entity if it is global.
15508 elsif Nkind
(N2
) = N_Explicit_Dereference
then
15509 if Is_Entity_Name
(Prefix
(N2
))
15510 and then Present
(Entity
(Prefix
(N2
)))
15511 and then Is_Global
(Entity
(Prefix
(N2
)))
15513 Set_Associated_Node
(N
, Prefix
(N2
));
15515 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
15516 and then Present
(Entity
(Name
(Prefix
(N2
))))
15517 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
15520 Make_Explicit_Dereference
(Loc
,
15522 Make_Function_Call
(Loc
,
15525 (Entity
(Name
(Prefix
(N2
))), Loc
))));
15528 Set_Associated_Node
(N
, Empty
);
15529 Set_Etype
(N
, Empty
);
15532 -- The subtype mark of a nominally unconstrained object is
15533 -- rewritten as a subtype indication using the bounds of the
15534 -- expression. Recover the original subtype mark.
15536 elsif Nkind
(N2
) = N_Subtype_Indication
15537 and then Is_Entity_Name
(Original_Node
(N2
))
15539 Set_Associated_Node
(N
, Original_Node
(N2
));
15543 end Save_References_In_Identifier
;
15545 ---------------------------------
15546 -- Save_References_In_Operator --
15547 ---------------------------------
15549 procedure Save_References_In_Operator
(N
: Node_Id
) is
15551 -- The node did not undergo a transformation
15553 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15554 if Nkind
(N
) = N_Op_Concat
then
15555 Set_Is_Component_Left_Opnd
(N
,
15556 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
15558 Set_Is_Component_Right_Opnd
(N
,
15559 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
15564 -- The analysis of the generic copy transformed the operator into
15565 -- some other construct. Propagate the changes to the template if
15569 N2
:= Get_Associated_Node
(N
);
15571 -- The operator resoved to a function call
15573 if Nkind
(N2
) = N_Function_Call
then
15575 -- Add explicit qualifications in the generic template for
15576 -- all operands of universal type. This aids resolution by
15577 -- preserving the actual type of a literal or an attribute
15578 -- that yields a universal result.
15580 Qualify_Universal_Operands
(N
, N2
);
15582 E
:= Entity
(Name
(N2
));
15584 if Present
(E
) and then Is_Global
(E
) then
15585 Set_Etype
(N
, Etype
(N2
));
15587 Set_Associated_Node
(N
, Empty
);
15588 Set_Etype
(N
, Empty
);
15591 -- The operator was folded into a literal
15593 elsif Nkind_In
(N2
, N_Integer_Literal
,
15597 if Present
(Original_Node
(N2
))
15598 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
15600 -- Operation was constant-folded. Whenever possible,
15601 -- recover semantic information from unfolded node,
15604 Set_Associated_Node
(N
, Original_Node
(N2
));
15606 if Nkind
(N
) = N_Op_Concat
then
15607 Set_Is_Component_Left_Opnd
(N
,
15608 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
15609 Set_Is_Component_Right_Opnd
(N
,
15610 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
15615 -- Propagate the constant folding back to the template
15618 Rewrite
(N
, New_Copy
(N2
));
15619 Set_Analyzed
(N
, False);
15622 -- The operator was folded into an enumeration literal. Retain
15623 -- the entity to avoid spurious ambiguities if it is overloaded
15624 -- at the point of instantiation or inlining.
15626 elsif Nkind
(N2
) = N_Identifier
15627 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
15629 Rewrite
(N
, New_Copy
(N2
));
15630 Set_Analyzed
(N
, False);
15634 -- Complete the operands check if node has not been constant
15637 if Nkind
(N
) in N_Op
then
15638 Save_Entity_Descendants
(N
);
15640 end Save_References_In_Operator
;
15642 -------------------------------
15643 -- Save_References_In_Pragma --
15644 -------------------------------
15646 procedure Save_References_In_Pragma
(Prag
: Node_Id
) is
15648 Do_Save
: Boolean := True;
15650 use Atree
.Unchecked_Access
;
15651 -- This code section is part of implementing an untyped tree
15652 -- traversal, so it needs direct access to node fields.
15655 -- Do not save global references in pragmas generated from aspects
15656 -- because the pragmas will be regenerated at instantiation time.
15658 if From_Aspect_Specification
(Prag
) then
15661 -- The capture of global references within contract-related source
15662 -- pragmas associated with generic packages, subprograms or their
15663 -- respective bodies must be delayed due to timing of annotation
15664 -- analysis. Global references are still captured in routine
15665 -- Save_Global_References_In_Contract.
15667 elsif Is_Generic_Contract_Pragma
(Prag
) and then Prag
/= Templ
then
15668 if Is_Package_Contract_Annotation
(Prag
) then
15669 Context
:= Find_Related_Package_Or_Body
(Prag
);
15671 pragma Assert
(Is_Subprogram_Contract_Annotation
(Prag
));
15672 Context
:= Find_Related_Declaration_Or_Body
(Prag
);
15675 -- The use of Original_Node accounts for the case when the
15676 -- related context is generic template.
15678 if Requires_Delayed_Save
(Original_Node
(Context
)) then
15683 -- For all other cases, save all global references within the
15684 -- descendants, but skip the following semantic fields:
15686 -- Field1 - Next_Pragma
15687 -- Field3 - Corresponding_Aspect
15688 -- Field5 - Next_Rep_Item
15691 Save_Global_Descendant
(Field2
(Prag
));
15692 Save_Global_Descendant
(Field4
(Prag
));
15694 end Save_References_In_Pragma
;
15696 -- Start of processing for Save_References
15704 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
15705 Save_References_In_Aggregate
(N
);
15707 -- Character literals, operator symbols
15709 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
15710 Save_References_In_Char_Lit_Or_Op_Symbol
(N
);
15712 -- Defining identifiers
15714 elsif Nkind
(N
) in N_Entity
then
15719 elsif Nkind
(N
) = N_Identifier
then
15720 Save_References_In_Identifier
(N
);
15724 elsif Nkind
(N
) in N_Op
then
15725 Save_References_In_Operator
(N
);
15729 elsif Nkind
(N
) = N_Pragma
then
15730 Save_References_In_Pragma
(N
);
15733 Save_References_In_Descendants
(N
);
15736 -- Save all global references found within the aspect specifications
15737 -- of the related node.
15739 if Permits_Aspect_Specifications
(N
) and then Has_Aspects
(N
) then
15741 -- The capture of global references within aspects associated with
15742 -- generic packages, subprograms or their bodies must be delayed
15743 -- due to timing of annotation analysis. Global references are
15744 -- still captured in routine Save_Global_References_In_Contract.
15746 if Requires_Delayed_Save
(N
) then
15749 -- Otherwise save all global references within the aspects
15752 Save_Global_References_In_Aspects
(N
);
15755 end Save_References
;
15757 -- Start of processing for Save_Global_References
15760 Gen_Scope
:= Current_Scope
;
15762 -- If the generic unit is a child unit, references to entities in the
15763 -- parent are treated as local, because they will be resolved anew in
15764 -- the context of the instance of the parent.
15766 while Is_Child_Unit
(Gen_Scope
)
15767 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
15769 Gen_Scope
:= Scope
(Gen_Scope
);
15772 Save_References
(Templ
);
15773 end Save_Global_References
;
15775 ---------------------------------------
15776 -- Save_Global_References_In_Aspects --
15777 ---------------------------------------
15779 procedure Save_Global_References_In_Aspects
(N
: Node_Id
) is
15784 Asp
:= First
(Aspect_Specifications
(N
));
15785 while Present
(Asp
) loop
15786 Expr
:= Expression
(Asp
);
15788 if Present
(Expr
) then
15789 Save_Global_References
(Expr
);
15794 end Save_Global_References_In_Aspects
;
15796 ------------------------------------------
15797 -- Set_Copied_Sloc_For_Inherited_Pragma --
15798 ------------------------------------------
15800 procedure Set_Copied_Sloc_For_Inherited_Pragma
15805 Create_Instantiation_Source
(N
, E
,
15806 Inlined_Body
=> False,
15807 Inherited_Pragma
=> True,
15808 Factor
=> S_Adjustment
);
15809 end Set_Copied_Sloc_For_Inherited_Pragma
;
15811 --------------------------------------
15812 -- Set_Copied_Sloc_For_Inlined_Body --
15813 --------------------------------------
15815 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
15817 Create_Instantiation_Source
(N
, E
,
15818 Inlined_Body
=> True,
15819 Inherited_Pragma
=> False,
15820 Factor
=> S_Adjustment
);
15821 end Set_Copied_Sloc_For_Inlined_Body
;
15823 ---------------------
15824 -- Set_Instance_Of --
15825 ---------------------
15827 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
15829 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
15830 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
15831 Generic_Renamings
.Increment_Last
;
15832 end Set_Instance_Of
;
15834 --------------------
15835 -- Set_Next_Assoc --
15836 --------------------
15838 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
15840 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
15841 end Set_Next_Assoc
;
15843 -------------------
15844 -- Start_Generic --
15845 -------------------
15847 procedure Start_Generic
is
15849 -- ??? More things could be factored out in this routine.
15850 -- Should probably be done at a later stage.
15852 Generic_Flags
.Append
(Inside_A_Generic
);
15853 Inside_A_Generic
:= True;
15855 Expander_Mode_Save_And_Set
(False);
15858 ----------------------
15859 -- Set_Instance_Env --
15860 ----------------------
15862 -- WARNING: This routine manages SPARK regions
15864 procedure Set_Instance_Env
15865 (Gen_Unit
: Entity_Id
;
15866 Act_Unit
: Entity_Id
)
15868 Saved_AE
: constant Boolean := Assertions_Enabled
;
15869 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
15870 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
15871 -- Save the SPARK mode-related data because utilizing the configuration
15872 -- values of pragmas and switches will eliminate any previously set
15876 -- Regardless of the current mode, predefined units are analyzed in the
15877 -- most current Ada mode, and earlier version Ada checks do not apply
15878 -- to predefined units. Nothing needs to be done for non-internal units.
15879 -- These are always analyzed in the current mode.
15881 if In_Internal_Unit
(Gen_Unit
) then
15882 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
15884 -- In Ada2012 we may want to enable assertions in an instance of a
15885 -- predefined unit, in which case we need to preserve the current
15886 -- setting for the Assertions_Enabled flag. This will become more
15887 -- critical when pre/postconditions are added to predefined units,
15888 -- as is already the case for some numeric libraries.
15890 if Ada_Version
>= Ada_2012
then
15891 Assertions_Enabled
:= Saved_AE
;
15894 -- Reinstall the SPARK_Mode which was in effect at the point of
15897 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
15900 Current_Instantiated_Parent
:=
15901 (Gen_Id
=> Gen_Unit
,
15902 Act_Id
=> Act_Unit
,
15903 Next_In_HTable
=> Assoc_Null
);
15904 end Set_Instance_Env
;
15910 procedure Switch_View
(T
: Entity_Id
) is
15911 BT
: constant Entity_Id
:= Base_Type
(T
);
15912 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
15913 Priv_Sub
: Entity_Id
;
15916 -- T may be private but its base type may have been exchanged through
15917 -- some other occurrence, in which case there is nothing to switch
15918 -- besides T itself. Note that a private dependent subtype of a private
15919 -- type might not have been switched even if the base type has been,
15920 -- because of the last branch of Check_Private_View (see comment there).
15922 if not Is_Private_Type
(BT
) then
15923 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
15924 Exchange_Declarations
(T
);
15928 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
15930 if Present
(Full_View
(BT
)) then
15931 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
15932 Exchange_Declarations
(BT
);
15935 while Present
(Priv_Elmt
) loop
15936 Priv_Sub
:= (Node
(Priv_Elmt
));
15938 -- We avoid flipping the subtype if the Etype of its full view is
15939 -- private because this would result in a malformed subtype. This
15940 -- occurs when the Etype of the subtype full view is the full view of
15941 -- the base type (and since the base types were just switched, the
15942 -- subtype is pointing to the wrong view). This is currently the case
15943 -- for tagged record types, access types (maybe more?) and needs to
15944 -- be resolved. ???
15946 if Present
(Full_View
(Priv_Sub
))
15947 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
15949 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
15950 Exchange_Declarations
(Priv_Sub
);
15953 Next_Elmt
(Priv_Elmt
);
15961 function True_Parent
(N
: Node_Id
) return Node_Id
is
15963 if Nkind
(Parent
(N
)) = N_Subunit
then
15964 return Parent
(Corresponding_Stub
(Parent
(N
)));
15970 -----------------------------
15971 -- Valid_Default_Attribute --
15972 -----------------------------
15974 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
15975 Attr_Id
: constant Attribute_Id
:=
15976 Get_Attribute_Id
(Attribute_Name
(Def
));
15977 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
15978 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
15984 if No
(T
) or else T
= Any_Id
then
15989 F
:= First_Formal
(Nam
);
15990 while Present
(F
) loop
15991 Num_F
:= Num_F
+ 1;
15996 when Attribute_Adjacent
15997 | Attribute_Ceiling
15998 | Attribute_Copy_Sign
16000 | Attribute_Fraction
16001 | Attribute_Machine
16003 | Attribute_Remainder
16004 | Attribute_Rounding
16005 | Attribute_Unbiased_Rounding
16009 and then Is_Floating_Point_Type
(T
);
16011 when Attribute_Image
16015 | Attribute_Wide_Image
16016 | Attribute_Wide_Value
16018 OK
:= Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
);
16023 OK
:= Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
);
16025 when Attribute_Input
=>
16026 OK
:= (Is_Fun
and then Num_F
= 1);
16028 when Attribute_Output
16032 OK
:= not Is_Fun
and then Num_F
= 2;
16040 ("attribute reference has wrong profile for subprogram", Def
);
16042 end Valid_Default_Attribute
;