1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2019, 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 Fname
; use Fname
;
34 with Fname
.UF
; use Fname
.UF
;
35 with Freeze
; use Freeze
;
36 with Ghost
; use Ghost
;
37 with Itypes
; use Itypes
;
39 with Lib
.Load
; use Lib
.Load
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Nlists
; use Nlists
;
42 with Namet
; use Namet
;
43 with Nmake
; use Nmake
;
45 with Rident
; use Rident
;
46 with Restrict
; use Restrict
;
47 with Rtsfind
; use Rtsfind
;
49 with Sem_Aux
; use Sem_Aux
;
50 with Sem_Cat
; use Sem_Cat
;
51 with Sem_Ch3
; use Sem_Ch3
;
52 with Sem_Ch6
; use Sem_Ch6
;
53 with Sem_Ch7
; use Sem_Ch7
;
54 with Sem_Ch8
; use Sem_Ch8
;
55 with Sem_Ch10
; use Sem_Ch10
;
56 with Sem_Ch13
; use Sem_Ch13
;
57 with Sem_Dim
; use Sem_Dim
;
58 with Sem_Disp
; use Sem_Disp
;
59 with Sem_Elab
; use Sem_Elab
;
60 with Sem_Elim
; use Sem_Elim
;
61 with Sem_Eval
; use Sem_Eval
;
62 with Sem_Prag
; use Sem_Prag
;
63 with Sem_Res
; use Sem_Res
;
64 with Sem_Type
; use Sem_Type
;
65 with Sem_Util
; use Sem_Util
;
66 with Sem_Warn
; use Sem_Warn
;
67 with Stand
; use Stand
;
68 with Sinfo
; use Sinfo
;
69 with Sinfo
.CN
; use Sinfo
.CN
;
70 with Sinput
; use Sinput
;
71 with Sinput
.L
; use Sinput
.L
;
72 with Snames
; use Snames
;
73 with Stringt
; use Stringt
;
74 with Uname
; use Uname
;
76 with Tbuild
; use Tbuild
;
77 with Uintp
; use Uintp
;
78 with Urealp
; use Urealp
;
79 with Warnsw
; use Warnsw
;
83 package body Sem_Ch12
is
85 ----------------------------------------------------------
86 -- Implementation of Generic Analysis and Instantiation --
87 ----------------------------------------------------------
89 -- GNAT implements generics by macro expansion. No attempt is made to share
90 -- generic instantiations (for now). Analysis of a generic definition does
91 -- not perform any expansion action, but the expander must be called on the
92 -- tree for each instantiation, because the expansion may of course depend
93 -- on the generic actuals. All of this is best achieved as follows:
95 -- a) Semantic analysis of a generic unit is performed on a copy of the
96 -- tree for the generic unit. All tree modifications that follow analysis
97 -- do not affect the original tree. Links are kept between the original
98 -- tree and the copy, in order to recognize non-local references within
99 -- the generic, and propagate them to each instance (recall that name
100 -- resolution is done on the generic declaration: generics are not really
101 -- macros). This is summarized in the following diagram:
103 -- .-----------. .----------.
104 -- | semantic |<--------------| generic |
106 -- | |==============>| |
107 -- |___________| global |__________|
118 -- b) Each instantiation copies the original tree, and inserts into it a
119 -- series of declarations that describe the mapping between generic formals
120 -- and actuals. For example, a generic In OUT parameter is an object
121 -- renaming of the corresponding actual, etc. Generic IN parameters are
122 -- constant declarations.
124 -- c) In order to give the right visibility for these renamings, we use
125 -- a different scheme for package and subprogram instantiations. For
126 -- packages, the list of renamings is inserted into the package
127 -- specification, before the visible declarations of the package. The
128 -- renamings are analyzed before any of the text of the instance, and are
129 -- thus visible at the right place. Furthermore, outside of the instance,
130 -- the generic parameters are visible and denote their corresponding
133 -- For subprograms, we create a container package to hold the renamings
134 -- and the subprogram instance itself. Analysis of the package makes the
135 -- renaming declarations visible to the subprogram. After analyzing the
136 -- package, the defining entity for the subprogram is touched-up so that
137 -- it appears declared in the current scope, and not inside the container
140 -- If the instantiation is a compilation unit, the container package is
141 -- given the same name as the subprogram instance. This ensures that
142 -- the elaboration procedure called by the binder, using the compilation
143 -- unit name, calls in fact the elaboration procedure for the package.
145 -- Not surprisingly, private types complicate this approach. By saving in
146 -- the original generic object the non-local references, we guarantee that
147 -- the proper entities are referenced at the point of instantiation.
148 -- However, for private types, this by itself does not insure that the
149 -- proper VIEW of the entity is used (the full type may be visible at the
150 -- point of generic definition, but not at instantiation, or vice-versa).
151 -- In order to reference the proper view, we special-case any reference
152 -- to private types in the generic object, by saving both views, one in
153 -- the generic and one in the semantic copy. At time of instantiation, we
154 -- check whether the two views are consistent, and exchange declarations if
155 -- necessary, in order to restore the correct visibility. Similarly, if
156 -- the instance view is private when the generic view was not, we perform
157 -- the exchange. After completing the instantiation, we restore the
158 -- current visibility. The flag Has_Private_View marks identifiers in the
159 -- the generic unit that require checking.
161 -- Visibility within nested generic units requires special handling.
162 -- Consider the following scheme:
164 -- type Global is ... -- outside of generic unit.
168 -- type Semi_Global is ... -- global to inner.
171 -- procedure inner (X1 : Global; X2 : Semi_Global);
173 -- procedure in2 is new inner (...); -- 4
176 -- package New_Outer is new Outer (...); -- 2
177 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
179 -- The semantic analysis of Outer captures all occurrences of Global.
180 -- The semantic analysis of Inner (at 1) captures both occurrences of
181 -- Global and Semi_Global.
183 -- At point 2 (instantiation of Outer), we also produce a generic copy
184 -- of Inner, even though Inner is, at that point, not being instantiated.
185 -- (This is just part of the semantic analysis of New_Outer).
187 -- Critically, references to Global within Inner must be preserved, while
188 -- references to Semi_Global should not preserved, because they must now
189 -- resolve to an entity within New_Outer. To distinguish between these, we
190 -- use a global variable, Current_Instantiated_Parent, which is set when
191 -- performing a generic copy during instantiation (at 2). This variable is
192 -- used when performing a generic copy that is not an instantiation, but
193 -- that is nested within one, as the occurrence of 1 within 2. The analysis
194 -- of a nested generic only preserves references that are global to the
195 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
196 -- determine whether a reference is external to the given parent.
198 -- The instantiation at point 3 requires no special treatment. The method
199 -- works as well for further nestings of generic units, but of course the
200 -- variable Current_Instantiated_Parent must be stacked because nested
201 -- instantiations can occur, e.g. the occurrence of 4 within 2.
203 -- The instantiation of package and subprogram bodies is handled in a
204 -- similar manner, except that it is delayed until after semantic
205 -- analysis is complete. In this fashion complex cross-dependencies
206 -- between several package declarations and bodies containing generics
207 -- can be compiled which otherwise would diagnose spurious circularities.
209 -- For example, it is possible to compile two packages A and B that
210 -- have the following structure:
212 -- package A is package B is
213 -- generic ... generic ...
214 -- package G_A is package G_B is
217 -- package body A is package body B is
218 -- package N_B is new G_B (..) package N_A is new G_A (..)
220 -- The table Pending_Instantiations in package Inline is used to keep
221 -- track of body instantiations that are delayed in this manner. Inline
222 -- handles the actual calls to do the body instantiations. This activity
223 -- is part of Inline, since the processing occurs at the same point, and
224 -- for essentially the same reason, as the handling of inlined routines.
226 ----------------------------------------------
227 -- Detection of Instantiation Circularities --
228 ----------------------------------------------
230 -- If we have a chain of instantiations that is circular, this is static
231 -- error which must be detected at compile time. The detection of these
232 -- circularities is carried out at the point that we insert a generic
233 -- instance spec or body. If there is a circularity, then the analysis of
234 -- the offending spec or body will eventually result in trying to load the
235 -- same unit again, and we detect this problem as we analyze the package
236 -- instantiation for the second time.
238 -- At least in some cases after we have detected the circularity, we get
239 -- into trouble if we try to keep going. The following flag is set if a
240 -- circularity is detected, and used to abandon compilation after the
241 -- messages have been posted.
243 -----------------------------------------
244 -- Implementation of Generic Contracts --
245 -----------------------------------------
247 -- A "contract" is a collection of aspects and pragmas that either verify a
248 -- property of a construct at runtime or classify the data flow to and from
249 -- the construct in some fashion.
251 -- Generic packages, subprograms and their respective bodies may be subject
252 -- to the following contract-related aspects or pragmas collectively known
255 -- package subprogram [body]
256 -- Abstract_State Contract_Cases
257 -- Initial_Condition Depends
258 -- Initializes Extensions_Visible
261 -- Refined_State Post_Class
271 -- Most package contract annotations utilize forward references to classify
272 -- data declared within the package [body]. Subprogram annotations then use
273 -- the classifications to further refine them. These inter dependencies are
274 -- problematic with respect to the implementation of generics because their
275 -- analysis, capture of global references and instantiation does not mesh
276 -- well with the existing mechanism.
278 -- 1) Analysis of generic contracts is carried out the same way non-generic
279 -- contracts are analyzed:
281 -- 1.1) General rule - a contract is analyzed after all related aspects
282 -- and pragmas are analyzed. This is done by routines
284 -- Analyze_Package_Body_Contract
285 -- Analyze_Package_Contract
286 -- Analyze_Subprogram_Body_Contract
287 -- Analyze_Subprogram_Contract
289 -- 1.2) Compilation unit - the contract is analyzed after Pragmas_After
292 -- 1.3) Compilation unit body - the contract is analyzed at the end of
293 -- the body declaration list.
295 -- 1.4) Package - the contract is analyzed at the end of the private or
296 -- visible declarations, prior to analyzing the contracts of any nested
297 -- packages or subprograms.
299 -- 1.5) Package body - the contract is analyzed at the end of the body
300 -- declaration list, prior to analyzing the contracts of any nested
301 -- packages or subprograms.
303 -- 1.6) Subprogram - if the subprogram is declared inside a block, a
304 -- package or a subprogram, then its contract is analyzed at the end of
305 -- the enclosing declarations, otherwise the subprogram is a compilation
308 -- 1.7) Subprogram body - if the subprogram body is declared inside a
309 -- block, a package body or a subprogram body, then its contract is
310 -- analyzed at the end of the enclosing declarations, otherwise the
311 -- subprogram is a compilation unit 1.3).
313 -- 2) Capture of global references within contracts is done after capturing
314 -- global references within the generic template. There are two reasons for
315 -- this delay - pragma annotations are not part of the generic template in
316 -- the case of a generic subprogram declaration, and analysis of contracts
319 -- Contract-related source pragmas within generic templates are prepared
320 -- for delayed capture of global references by routine
322 -- Create_Generic_Contract
324 -- The routine associates these pragmas with the contract of the template.
325 -- In the case of a generic subprogram declaration, the routine creates
326 -- generic templates for the pragmas declared after the subprogram because
327 -- they are not part of the template.
329 -- generic -- template starts
330 -- procedure Gen_Proc (Input : Integer); -- template ends
331 -- pragma Precondition (Input > 0); -- requires own template
333 -- 2.1) The capture of global references with aspect specifications and
334 -- source pragmas that apply to a generic unit must be suppressed when
335 -- the generic template is being processed because the contracts have not
336 -- been analyzed yet. Any attempts to capture global references at that
337 -- point will destroy the Associated_Node linkages and leave the template
338 -- undecorated. This delay is controlled by routine
340 -- Requires_Delayed_Save
342 -- 2.2) The real capture of global references within a contract is done
343 -- after the contract has been analyzed, by routine
345 -- Save_Global_References_In_Contract
347 -- 3) The instantiation of a generic contract occurs as part of the
348 -- instantiation of the contract owner. Generic subprogram declarations
349 -- require additional processing when the contract is specified by pragmas
350 -- because the pragmas are not part of the generic template. This is done
353 -- Instantiate_Subprogram_Contract
355 Circularity_Detected
: Boolean := False;
356 -- This should really be reset on encountering a new main unit, but in
357 -- practice we are not using multiple main units so it is not critical.
359 --------------------------------------------------
360 -- Formal packages and partial parameterization --
361 --------------------------------------------------
363 -- When compiling a generic, a formal package is a local instantiation. If
364 -- declared with a box, its generic formals are visible in the enclosing
365 -- generic. If declared with a partial list of actuals, those actuals that
366 -- are defaulted (covered by an Others clause, or given an explicit box
367 -- initialization) are also visible in the enclosing generic, while those
368 -- that have a corresponding actual are not.
370 -- In our source model of instantiation, the same visibility must be
371 -- present in the spec and body of an instance: the names of the formals
372 -- that are defaulted must be made visible within the instance, and made
373 -- invisible (hidden) after the instantiation is complete, so that they
374 -- are not accessible outside of the instance.
376 -- In a generic, a formal package is treated like a special instantiation.
377 -- Our Ada 95 compiler handled formals with and without box in different
378 -- ways. With partial parameterization, we use a single model for both.
379 -- We create a package declaration that consists of the specification of
380 -- the generic package, and a set of declarations that map the actuals
381 -- into local renamings, just as we do for bona fide instantiations. For
382 -- defaulted parameters and formals with a box, we copy directly the
383 -- declarations of the formal into this local package. The result is a
384 -- a package whose visible declarations may include generic formals. This
385 -- package is only used for type checking and visibility analysis, and
386 -- never reaches the back-end, so it can freely violate the placement
387 -- rules for generic formal declarations.
389 -- The list of declarations (renamings and copies of formals) is built
390 -- by Analyze_Associations, just as for regular instantiations.
392 -- At the point of instantiation, conformance checking must be applied only
393 -- to those parameters that were specified in the formal. We perform this
394 -- checking by creating another internal instantiation, this one including
395 -- only the renamings and the formals (the rest of the package spec is not
396 -- relevant to conformance checking). We can then traverse two lists: the
397 -- list of actuals in the instance that corresponds to the formal package,
398 -- and the list of actuals produced for this bogus instantiation. We apply
399 -- the conformance rules to those actuals that are not defaulted (i.e.
400 -- which still appear as generic formals.
402 -- When we compile an instance body we must make the right parameters
403 -- visible again. The predicate Is_Generic_Formal indicates which of the
404 -- formals should have its Is_Hidden flag reset.
406 -----------------------
407 -- Local subprograms --
408 -----------------------
410 procedure Abandon_Instantiation
(N
: Node_Id
);
411 pragma No_Return
(Abandon_Instantiation
);
412 -- Posts an error message "instantiation abandoned" at the indicated node
413 -- and then raises the exception Instantiation_Error to do it.
415 procedure Analyze_Formal_Array_Type
416 (T
: in out Entity_Id
;
418 -- A formal array type is treated like an array type declaration, and
419 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
420 -- in-out, because in the case of an anonymous type the entity is
421 -- actually created in the procedure.
423 -- The following procedures treat other kinds of formal parameters
425 procedure Analyze_Formal_Derived_Interface_Type
430 procedure Analyze_Formal_Derived_Type
435 procedure Analyze_Formal_Interface_Type
440 -- The following subprograms create abbreviated declarations for formal
441 -- scalar types. We introduce an anonymous base of the proper class for
442 -- each of them, and define the formals as constrained first subtypes of
443 -- their bases. The bounds are expressions that are non-static in the
446 procedure Analyze_Formal_Decimal_Fixed_Point_Type
447 (T
: Entity_Id
; Def
: Node_Id
);
448 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
449 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
450 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
451 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
452 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
453 (T
: Entity_Id
; Def
: Node_Id
);
455 procedure Analyze_Formal_Private_Type
459 -- Creates a new private type, which does not require completion
461 procedure Analyze_Formal_Incomplete_Type
(T
: Entity_Id
; Def
: Node_Id
);
462 -- Ada 2012: Creates a new incomplete type whose actual does not freeze
464 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
465 -- Analyze generic formal part
467 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
468 -- Create a new access type with the given designated type
470 function Analyze_Associations
473 F_Copy
: List_Id
) return List_Id
;
474 -- At instantiation time, build the list of associations between formals
475 -- and actuals. Each association becomes a renaming declaration for the
476 -- formal entity. F_Copy is the analyzed list of formals in the generic
477 -- copy. It is used to apply legality checks to the actuals. I_Node is the
478 -- instantiation node itself.
480 procedure Analyze_Subprogram_Instantiation
484 procedure Build_Instance_Compilation_Unit_Nodes
488 -- This procedure is used in the case where the generic instance of a
489 -- subprogram body or package body is a library unit. In this case, the
490 -- original library unit node for the generic instantiation must be
491 -- replaced by the resulting generic body, and a link made to a new
492 -- compilation unit node for the generic declaration. The argument N is
493 -- the original generic instantiation. Act_Body and Act_Decl are the body
494 -- and declaration of the instance (either package body and declaration
495 -- nodes or subprogram body and declaration nodes depending on the case).
496 -- On return, the node N has been rewritten with the actual body.
498 procedure Check_Access_Definition
(N
: Node_Id
);
499 -- Subsidiary routine to null exclusion processing. Perform an assertion
500 -- check on Ada version and the presence of an access definition in N.
502 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
503 -- Apply the following to all formal packages in generic associations.
504 -- Restore the visibility of the formals of the instance that are not
505 -- defaulted (see RM 12.7 (10)). Remove the anonymous package declaration
506 -- created for formal instances that are not defaulted.
508 procedure Check_Formal_Package_Instance
509 (Formal_Pack
: Entity_Id
;
510 Actual_Pack
: Entity_Id
);
511 -- Verify that the actuals of the actual instance match the actuals of
512 -- the template for a formal package that is not declared with a box.
514 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
515 -- If the generic is a local entity and the corresponding body has not
516 -- been seen yet, flag enclosing packages to indicate that it will be
517 -- elaborated after the generic body. Subprograms declared in the same
518 -- package cannot be inlined by the front end because front-end inlining
519 -- requires a strict linear order of elaboration.
521 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
;
522 -- Check if some association between formals and actuals requires to make
523 -- visible primitives of a tagged type, and make those primitives visible.
524 -- Return the list of primitives whose visibility is modified (to restore
525 -- their visibility later through Restore_Hidden_Primitives). If no
526 -- candidate is found then return No_Elist.
528 procedure Check_Hidden_Child_Unit
530 Gen_Unit
: Entity_Id
;
531 Act_Decl_Id
: Entity_Id
);
532 -- If the generic unit is an implicit child instance within a parent
533 -- instance, we need to make an explicit test that it is not hidden by
534 -- a child instance of the same name and parent.
536 procedure Check_Generic_Actuals
537 (Instance
: Entity_Id
;
538 Is_Formal_Box
: Boolean);
539 -- Similar to previous one. Check the actuals in the instantiation,
540 -- whose views can change between the point of instantiation and the point
541 -- of instantiation of the body. In addition, mark the generic renamings
542 -- as generic actuals, so that they are not compatible with other actuals.
543 -- Recurse on an actual that is a formal package whose declaration has
546 function Contains_Instance_Of
549 N
: Node_Id
) return Boolean;
550 -- Inner is instantiated within the generic Outer. Check whether Inner
551 -- directly or indirectly contains an instance of Outer or of one of its
552 -- parents, in the case of a subunit. Each generic unit holds a list of
553 -- the entities instantiated within (at any depth). This procedure
554 -- determines whether the set of such lists contains a cycle, i.e. an
555 -- illegal circular instantiation.
557 function Denotes_Formal_Package
559 On_Exit
: Boolean := False;
560 Instance
: Entity_Id
:= Empty
) return Boolean;
561 -- Returns True if E is a formal package of an enclosing generic, or
562 -- the actual for such a formal in an enclosing instantiation. If such
563 -- a package is used as a formal in an nested generic, or as an actual
564 -- in a nested instantiation, the visibility of ITS formals should not
565 -- be modified. When called from within Restore_Private_Views, the flag
566 -- On_Exit is true, to indicate that the search for a possible enclosing
567 -- instance should ignore the current one. In that case Instance denotes
568 -- the declaration for which this is an actual. This declaration may be
569 -- an instantiation in the source, or the internal instantiation that
570 -- corresponds to the actual for a formal package.
572 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
573 -- Yields True if N1 and N2 appear in the same compilation unit,
574 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
575 -- traversal of the tree for the unit. Used to determine the placement
576 -- of freeze nodes for instance bodies that may depend on other instances.
578 function Find_Actual_Type
580 Gen_Type
: Entity_Id
) return Entity_Id
;
581 -- When validating the actual types of a child instance, check whether
582 -- the formal is a formal type of the parent unit, and retrieve the current
583 -- actual for it. Typ is the entity in the analyzed formal type declaration
584 -- (component or index type of an array type, or designated type of an
585 -- access formal) and Gen_Type is the enclosing analyzed formal array
586 -- or access type. The desired actual may be a formal of a parent, or may
587 -- be declared in a formal package of a parent. In both cases it is a
588 -- generic actual type because it appears within a visible instance.
589 -- Finally, it may be declared in a parent unit without being a formal
590 -- of that unit, in which case it must be retrieved by visibility.
591 -- Ambiguities may still arise if two homonyms are declared in two formal
592 -- packages, and the prefix of the formal type may be needed to resolve
593 -- the ambiguity in the instance ???
595 procedure Freeze_Subprogram_Body
596 (Inst_Node
: Node_Id
;
598 Pack_Id
: Entity_Id
);
599 -- The generic body may appear textually after the instance, including
600 -- in the proper body of a stub, or within a different package instance.
601 -- Given that the instance can only be elaborated after the generic, we
602 -- place freeze_nodes for the instance and/or for packages that may enclose
603 -- the instance and the generic, so that the back-end can establish the
604 -- proper order of elaboration.
606 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
607 -- In order to propagate semantic information back from the analyzed copy
608 -- to the original generic, we maintain links between selected nodes in the
609 -- generic and their corresponding copies. At the end of generic analysis,
610 -- the routine Save_Global_References traverses the generic tree, examines
611 -- the semantic information, and preserves the links to those nodes that
612 -- contain global information. At instantiation, the information from the
613 -- associated node is placed on the new copy, so that name resolution is
616 -- Three kinds of source nodes have associated nodes:
618 -- a) those that can reference (denote) entities, that is identifiers,
619 -- character literals, expanded_names, operator symbols, operators,
620 -- and attribute reference nodes. These nodes have an Entity field
621 -- and are the set of nodes that are in N_Has_Entity.
623 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
625 -- c) selected components (N_Selected_Component)
627 -- For the first class, the associated node preserves the entity if it is
628 -- global. If the generic contains nested instantiations, the associated
629 -- node itself has been recopied, and a chain of them must be followed.
631 -- For aggregates, the associated node allows retrieval of the type, which
632 -- may otherwise not appear in the generic. The view of this type may be
633 -- different between generic and instantiation, and the full view can be
634 -- installed before the instantiation is analyzed. For aggregates of type
635 -- extensions, the same view exchange may have to be performed for some of
636 -- the ancestor types, if their view is private at the point of
639 -- Nodes that are selected components in the parse tree may be rewritten
640 -- as expanded names after resolution, and must be treated as potential
641 -- entity holders, which is why they also have an Associated_Node.
643 -- Nodes that do not come from source, such as freeze nodes, do not appear
644 -- in the generic tree, and need not have an associated node.
646 -- The associated node is stored in the Associated_Node field. Note that
647 -- this field overlaps Entity, which is fine, because the whole point is
648 -- that we don't need or want the normal Entity field in this situation.
650 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
651 -- Traverse the Exchanged_Views list to see if a type was private
652 -- and has already been flipped during this phase of instantiation.
654 procedure Hide_Current_Scope
;
655 -- When instantiating a generic child unit, the parent context must be
656 -- present, but the instance and all entities that may be generated
657 -- must be inserted in the current scope. We leave the current scope
658 -- on the stack, but make its entities invisible to avoid visibility
659 -- problems. This is reversed at the end of the instantiation. This is
660 -- not done for the instantiation of the bodies, which only require the
661 -- instances of the generic parents to be in scope.
663 function In_Main_Context
(E
: Entity_Id
) return Boolean;
664 -- Check whether an instantiation is in the context of the main unit.
665 -- Used to determine whether its body should be elaborated to allow
666 -- front-end inlining.
668 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
669 -- Add the context clause of the unit containing a generic unit to a
670 -- compilation unit that is, or contains, an instantiation.
673 -- Establish environment for subsequent instantiation. Separated from
674 -- Save_Env because data-structures for visibility handling must be
675 -- initialized before call to Check_Generic_Child_Unit.
677 procedure Inline_Instance_Body
679 Gen_Unit
: Entity_Id
;
681 -- If front-end inlining is requested, instantiate the package body,
682 -- and preserve the visibility of its compilation unit, to insure
683 -- that successive instantiations succeed.
685 procedure Insert_Freeze_Node_For_Instance
688 -- N denotes a package or a subprogram instantiation and F_Node is the
689 -- associated freeze node. Insert the freeze node before the first source
690 -- body which follows immediately after N. If no such body is found, the
691 -- freeze node is inserted at the end of the declarative region which
694 procedure Install_Body
699 -- If the instantiation happens textually before the body of the generic,
700 -- the instantiation of the body must be analyzed after the generic body,
701 -- and not at the point of instantiation. Such early instantiations can
702 -- happen if the generic and the instance appear in a package declaration
703 -- because the generic body can only appear in the corresponding package
704 -- body. Early instantiations can also appear if generic, instance and
705 -- body are all in the declarative part of a subprogram or entry. Entities
706 -- of packages that are early instantiations are delayed, and their freeze
707 -- node appears after the generic body. This rather complex machinery is
708 -- needed when nested instantiations are present, because the source does
709 -- not carry any indication of where the corresponding instance bodies must
710 -- be installed and frozen.
712 procedure Install_Formal_Packages
(Par
: Entity_Id
);
713 -- Install the visible part of any formal of the parent that is a formal
714 -- package. Note that for the case of a formal package with a box, this
715 -- includes the formal part of the formal package (12.7(10/2)).
717 procedure Install_Hidden_Primitives
718 (Prims_List
: in out Elist_Id
;
721 -- Remove suffix 'P' from hidden primitives of Act_T to match the
722 -- visibility of primitives of Gen_T. The list of primitives to which
723 -- the suffix is removed is added to Prims_List to restore them later.
725 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
726 -- When compiling an instance of a child unit the parent (which is
727 -- itself an instance) is an enclosing scope that must be made
728 -- immediately visible. This procedure is also used to install the non-
729 -- generic parent of a generic child unit when compiling its body, so
730 -- that full views of types in the parent are made visible.
732 -- The functions Instantiate_XXX perform various legality checks and build
733 -- the declarations for instantiated generic parameters. In all of these
734 -- Formal is the entity in the generic unit, Actual is the entity of
735 -- expression in the generic associations, and Analyzed_Formal is the
736 -- formal in the generic copy, which contains the semantic information to
737 -- be used to validate the actual.
739 function Instantiate_Object
742 Analyzed_Formal
: Node_Id
) return List_Id
;
744 function Instantiate_Type
747 Analyzed_Formal
: Node_Id
;
748 Actual_Decls
: List_Id
) return List_Id
;
750 function Instantiate_Formal_Subprogram
753 Analyzed_Formal
: Node_Id
) return Node_Id
;
755 function Instantiate_Formal_Package
758 Analyzed_Formal
: Node_Id
) return List_Id
;
759 -- If the formal package is declared with a box, special visibility rules
760 -- apply to its formals: they are in the visible part of the package. This
761 -- is true in the declarative region of the formal package, that is to say
762 -- in the enclosing generic or instantiation. For an instantiation, the
763 -- parameters of the formal package are made visible in an explicit step.
764 -- Furthermore, if the actual has a visible USE clause, these formals must
765 -- be made potentially use-visible as well. On exit from the enclosing
766 -- instantiation, the reverse must be done.
768 -- For a formal package declared without a box, there are conformance rules
769 -- that apply to the actuals in the generic declaration and the actuals of
770 -- the actual package in the enclosing instantiation. The simplest way to
771 -- apply these rules is to repeat the instantiation of the formal package
772 -- in the context of the enclosing instance, and compare the generic
773 -- associations of this instantiation with those of the actual package.
774 -- This internal instantiation only needs to contain the renamings of the
775 -- formals: the visible and private declarations themselves need not be
778 -- In Ada 2005, the formal package may be only partially parameterized.
779 -- In that case the visibility step must make visible those actuals whose
780 -- corresponding formals were given with a box. A final complication
781 -- involves inherited operations from formal derived types, which must
782 -- be visible if the type is.
784 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
785 -- Test if given node is in the main unit
787 procedure Load_Parent_Of_Generic
790 Body_Optional
: Boolean := False);
791 -- If the generic appears in a separate non-generic library unit, load the
792 -- corresponding body to retrieve the body of the generic. N is the node
793 -- for the generic instantiation, Spec is the generic package declaration.
795 -- Body_Optional is a flag that indicates that the body is being loaded to
796 -- ensure that temporaries are generated consistently when there are other
797 -- instances in the current declarative part that precede the one being
798 -- loaded. In that case a missing body is acceptable.
800 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
801 -- Within the generic part, entities in the formal package are
802 -- visible. To validate subsequent type declarations, indicate
803 -- the correspondence between the entities in the analyzed formal,
804 -- and the entities in the actual package. There are three packages
805 -- involved in the instantiation of a formal package: the parent
806 -- generic P1 which appears in the generic declaration, the fake
807 -- instantiation P2 which appears in the analyzed generic, and whose
808 -- visible entities may be used in subsequent formals, and the actual
809 -- P3 in the instance. To validate subsequent formals, me indicate
810 -- that the entities in P2 are mapped into those of P3. The mapping of
811 -- entities has to be done recursively for nested packages.
813 procedure Move_Freeze_Nodes
817 -- Freeze nodes can be generated in the analysis of a generic unit, but
818 -- will not be seen by the back-end. It is necessary to move those nodes
819 -- to the enclosing scope if they freeze an outer entity. We place them
820 -- at the end of the enclosing generic package, which is semantically
823 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
);
824 -- Analyze actuals to perform name resolution. Full resolution is done
825 -- later, when the expected types are known, but names have to be captured
826 -- before installing parents of generics, that are not visible for the
827 -- actuals themselves.
829 -- If Inst is present, it is the entity of the package instance. This
830 -- entity is marked as having a limited_view actual when some actual is
831 -- a limited view. This is used to place the instance body properly.
833 procedure Provide_Completing_Bodies
(N
: Node_Id
);
834 -- Generate completing bodies for all subprograms found within package or
835 -- subprogram declaration N.
837 procedure Remove_Parent
(In_Body
: Boolean := False);
838 -- Reverse effect after instantiation of child is complete
840 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
);
841 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List
844 procedure Set_Instance_Env
845 (Gen_Unit
: Entity_Id
;
846 Act_Unit
: Entity_Id
);
847 -- Save current instance on saved environment, to be used to determine
848 -- the global status of entities in nested instances. Part of Save_Env.
849 -- called after verifying that the generic unit is legal for the instance,
850 -- The procedure also examines whether the generic unit is a predefined
851 -- unit, in order to set configuration switches accordingly. As a result
852 -- the procedure must be called after analyzing and freezing the actuals.
854 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
855 -- Associate analyzed generic parameter with corresponding instance. Used
856 -- for semantic checks at instantiation time.
858 function True_Parent
(N
: Node_Id
) return Node_Id
;
859 -- For a subunit, return parent of corresponding stub, else return
862 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
863 -- Verify that an attribute that appears as the default for a formal
864 -- subprogram is a function or procedure with the correct profile.
866 -------------------------------------------
867 -- Data Structures for Generic Renamings --
868 -------------------------------------------
870 -- The map Generic_Renamings associates generic entities with their
871 -- corresponding actuals. Currently used to validate type instances. It
872 -- will eventually be used for all generic parameters to eliminate the
873 -- need for overload resolution in the instance.
875 type Assoc_Ptr
is new Int
;
877 Assoc_Null
: constant Assoc_Ptr
:= -1;
882 Next_In_HTable
: Assoc_Ptr
;
885 package Generic_Renamings
is new Table
.Table
886 (Table_Component_Type
=> Assoc
,
887 Table_Index_Type
=> Assoc_Ptr
,
888 Table_Low_Bound
=> 0,
890 Table_Increment
=> 100,
891 Table_Name
=> "Generic_Renamings");
893 -- Variable to hold enclosing instantiation. When the environment is
894 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
896 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
898 -- Hash table for associations
900 HTable_Size
: constant := 37;
901 type HTable_Range
is range 0 .. HTable_Size
- 1;
903 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
904 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
905 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
906 function Hash
(F
: Entity_Id
) return HTable_Range
;
908 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
909 Header_Num
=> HTable_Range
,
911 Elmt_Ptr
=> Assoc_Ptr
,
912 Null_Ptr
=> Assoc_Null
,
913 Set_Next
=> Set_Next_Assoc
,
916 Get_Key
=> Get_Gen_Id
,
920 Exchanged_Views
: Elist_Id
;
921 -- This list holds the private views that have been exchanged during
922 -- instantiation to restore the visibility of the generic declaration.
923 -- (see comments above). After instantiation, the current visibility is
924 -- reestablished by means of a traversal of this list.
926 Hidden_Entities
: Elist_Id
;
927 -- This list holds the entities of the current scope that are removed
928 -- from immediate visibility when instantiating a child unit. Their
929 -- visibility is restored in Remove_Parent.
931 -- Because instantiations can be recursive, the following must be saved
932 -- on entry and restored on exit from an instantiation (spec or body).
933 -- This is done by the two procedures Save_Env and Restore_Env. For
934 -- package and subprogram instantiations (but not for the body instances)
935 -- the action of Save_Env is done in two steps: Init_Env is called before
936 -- Check_Generic_Child_Unit, because setting the parent instances requires
937 -- that the visibility data structures be properly initialized. Once the
938 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
940 Parent_Unit_Visible
: Boolean := False;
941 -- Parent_Unit_Visible is used when the generic is a child unit, and
942 -- indicates whether the ultimate parent of the generic is visible in the
943 -- instantiation environment. It is used to reset the visibility of the
944 -- parent at the end of the instantiation (see Remove_Parent).
946 Instance_Parent_Unit
: Entity_Id
:= Empty
;
947 -- This records the ultimate parent unit of an instance of a generic
948 -- child unit and is used in conjunction with Parent_Unit_Visible to
949 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
951 type Instance_Env
is record
952 Instantiated_Parent
: Assoc
;
953 Exchanged_Views
: Elist_Id
;
954 Hidden_Entities
: Elist_Id
;
955 Current_Sem_Unit
: Unit_Number_Type
;
956 Parent_Unit_Visible
: Boolean := False;
957 Instance_Parent_Unit
: Entity_Id
:= Empty
;
958 Switches
: Config_Switches_Type
;
961 package Instance_Envs
is new Table
.Table
(
962 Table_Component_Type
=> Instance_Env
,
963 Table_Index_Type
=> Int
,
964 Table_Low_Bound
=> 0,
966 Table_Increment
=> 100,
967 Table_Name
=> "Instance_Envs");
969 procedure Restore_Private_Views
970 (Pack_Id
: Entity_Id
;
971 Is_Package
: Boolean := True);
972 -- Restore the private views of external types, and unmark the generic
973 -- renamings of actuals, so that they become compatible subtypes again.
974 -- For subprograms, Pack_Id is the package constructed to hold the
977 procedure Switch_View
(T
: Entity_Id
);
978 -- Switch the partial and full views of a type and its private
979 -- dependents (i.e. its subtypes and derived types).
981 ------------------------------------
982 -- Structures for Error Reporting --
983 ------------------------------------
985 Instantiation_Node
: Node_Id
;
986 -- Used by subprograms that validate instantiation of formal parameters
987 -- where there might be no actual on which to place the error message.
988 -- Also used to locate the instantiation node for generic subunits.
990 Instantiation_Error
: exception;
991 -- When there is a semantic error in the generic parameter matching,
992 -- there is no point in continuing the instantiation, because the
993 -- number of cascaded errors is unpredictable. This exception aborts
994 -- the instantiation process altogether.
996 S_Adjustment
: Sloc_Adjustment
;
997 -- Offset created for each node in an instantiation, in order to keep
998 -- track of the source position of the instantiation in each of its nodes.
999 -- A subsequent semantic error or warning on a construct of the instance
1000 -- points to both places: the original generic node, and the point of
1001 -- instantiation. See Sinput and Sinput.L for additional details.
1003 ------------------------------------------------------------
1004 -- Data structure for keeping track when inside a Generic --
1005 ------------------------------------------------------------
1007 -- The following table is used to save values of the Inside_A_Generic
1008 -- flag (see spec of Sem) when they are saved by Start_Generic.
1010 package Generic_Flags
is new Table
.Table
(
1011 Table_Component_Type
=> Boolean,
1012 Table_Index_Type
=> Int
,
1013 Table_Low_Bound
=> 0,
1014 Table_Initial
=> 32,
1015 Table_Increment
=> 200,
1016 Table_Name
=> "Generic_Flags");
1018 ---------------------------
1019 -- Abandon_Instantiation --
1020 ---------------------------
1022 procedure Abandon_Instantiation
(N
: Node_Id
) is
1024 Error_Msg_N
("\instantiation abandoned!", N
);
1025 raise Instantiation_Error
;
1026 end Abandon_Instantiation
;
1028 --------------------------------
1029 -- Add_Pending_Instantiation --
1030 --------------------------------
1032 procedure Add_Pending_Instantiation
(Inst
: Node_Id
; Act_Decl
: Node_Id
) is
1034 -- Capture the body of the generic instantiation along with its context
1035 -- for later processing by Instantiate_Bodies.
1037 Pending_Instantiations
.Append
1038 ((Act_Decl
=> Act_Decl
,
1039 Config_Switches
=> Save_Config_Switches
,
1040 Current_Sem_Unit
=> Current_Sem_Unit
,
1041 Expander_Status
=> Expander_Active
,
1043 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
1044 Scope_Suppress
=> Scope_Suppress
,
1045 Warnings
=> Save_Warnings
));
1046 end Add_Pending_Instantiation
;
1048 ----------------------------------
1049 -- Adjust_Inherited_Pragma_Sloc --
1050 ----------------------------------
1052 procedure Adjust_Inherited_Pragma_Sloc
(N
: Node_Id
) is
1054 Adjust_Instantiation_Sloc
(N
, S_Adjustment
);
1055 end Adjust_Inherited_Pragma_Sloc
;
1057 --------------------------
1058 -- Analyze_Associations --
1059 --------------------------
1061 function Analyze_Associations
1064 F_Copy
: List_Id
) return List_Id
1066 Actuals_To_Freeze
: constant Elist_Id
:= New_Elmt_List
;
1067 Assoc_List
: constant List_Id
:= New_List
;
1068 Default_Actuals
: constant List_Id
:= New_List
;
1069 Gen_Unit
: constant Entity_Id
:=
1070 Defining_Entity
(Parent
(F_Copy
));
1074 Analyzed_Formal
: Node_Id
;
1075 First_Named
: Node_Id
:= Empty
;
1079 Saved_Formal
: Node_Id
;
1081 Default_Formals
: constant List_Id
:= New_List
;
1082 -- If an Others_Choice is present, some of the formals may be defaulted.
1083 -- To simplify the treatment of visibility in an instance, we introduce
1084 -- individual defaults for each such formal. These defaults are
1085 -- appended to the list of associations and replace the Others_Choice.
1087 Found_Assoc
: Node_Id
;
1088 -- Association for the current formal being match. Empty if there are
1089 -- no remaining actuals, or if there is no named association with the
1090 -- name of the formal.
1092 Is_Named_Assoc
: Boolean;
1093 Num_Matched
: Nat
:= 0;
1094 Num_Actuals
: Nat
:= 0;
1096 Others_Present
: Boolean := False;
1097 Others_Choice
: Node_Id
:= Empty
;
1098 -- In Ada 2005, indicates partial parameterization of a formal
1099 -- package. As usual an other association must be last in the list.
1101 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
);
1102 -- Warn if an actual fixed-point type has user-defined arithmetic
1103 -- operations, but there is no corresponding formal in the generic,
1104 -- in which case the predefined operations will be used. This merits
1105 -- a warning because of the special semantics of fixed point ops.
1107 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
);
1108 -- Apply RM 12.3(9): if a formal subprogram is overloaded, the instance
1109 -- cannot have a named association for it. AI05-0025 extends this rule
1110 -- to formals of formal packages by AI05-0025, and it also applies to
1111 -- box-initialized formals.
1113 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean;
1114 -- Determine whether the parameter types and the return type of Subp
1115 -- are fully defined at the point of instantiation.
1117 function Matching_Actual
1119 A_F
: Entity_Id
) return Node_Id
;
1120 -- Find actual that corresponds to a given a formal parameter. If the
1121 -- actuals are positional, return the next one, if any. If the actuals
1122 -- are named, scan the parameter associations to find the right one.
1123 -- A_F is the corresponding entity in the analyzed generic, which is
1124 -- placed on the selector name for ASIS use.
1126 -- In Ada 2005, a named association may be given with a box, in which
1127 -- case Matching_Actual sets Found_Assoc to the generic association,
1128 -- but return Empty for the actual itself. In this case the code below
1129 -- creates a corresponding declaration for the formal.
1131 function Partial_Parameterization
return Boolean;
1132 -- Ada 2005: if no match is found for a given formal, check if the
1133 -- association for it includes a box, or whether the associations
1134 -- include an Others clause.
1136 procedure Process_Default
(F
: Entity_Id
);
1137 -- Add a copy of the declaration of generic formal F to the list of
1138 -- associations, and add an explicit box association for F if there
1139 -- is none yet, and the default comes from an Others_Choice.
1141 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean;
1142 -- Determine whether Subp renames one of the subprograms defined in the
1143 -- generated package Standard.
1145 procedure Set_Analyzed_Formal
;
1146 -- Find the node in the generic copy that corresponds to a given formal.
1147 -- The semantic information on this node is used to perform legality
1148 -- checks on the actuals. Because semantic analysis can introduce some
1149 -- anonymous entities or modify the declaration node itself, the
1150 -- correspondence between the two lists is not one-one. In addition to
1151 -- anonymous types, the presence a formal equality will introduce an
1152 -- implicit declaration for the corresponding inequality.
1154 ----------------------------------------
1155 -- Check_Overloaded_Formal_Subprogram --
1156 ----------------------------------------
1158 procedure Check_Overloaded_Formal_Subprogram
(Formal
: Entity_Id
) is
1159 Temp_Formal
: Entity_Id
;
1162 Temp_Formal
:= First
(Formals
);
1163 while Present
(Temp_Formal
) loop
1164 if Nkind
(Temp_Formal
) in N_Formal_Subprogram_Declaration
1165 and then Temp_Formal
/= Formal
1167 Chars
(Defining_Unit_Name
(Specification
(Formal
))) =
1168 Chars
(Defining_Unit_Name
(Specification
(Temp_Formal
)))
1170 if Present
(Found_Assoc
) then
1172 ("named association not allowed for overloaded formal",
1177 ("named association not allowed for overloaded formal",
1181 Abandon_Instantiation
(Instantiation_Node
);
1186 end Check_Overloaded_Formal_Subprogram
;
1188 -------------------------------
1189 -- Check_Fixed_Point_Actual --
1190 -------------------------------
1192 procedure Check_Fixed_Point_Actual
(Actual
: Node_Id
) is
1193 Typ
: constant Entity_Id
:= Entity
(Actual
);
1194 Prims
: constant Elist_Id
:= Collect_Primitive_Operations
(Typ
);
1200 -- Locate primitive operations of the type that are arithmetic
1203 Elem
:= First_Elmt
(Prims
);
1204 while Present
(Elem
) loop
1205 if Nkind
(Node
(Elem
)) = N_Defining_Operator_Symbol
then
1207 -- Check whether the generic unit has a formal subprogram of
1208 -- the same name. This does not check types but is good enough
1209 -- to justify a warning.
1211 Formal
:= First_Non_Pragma
(Formals
);
1212 Op
:= Alias
(Node
(Elem
));
1214 while Present
(Formal
) loop
1215 if Nkind
(Formal
) = N_Formal_Concrete_Subprogram_Declaration
1216 and then Chars
(Defining_Entity
(Formal
)) =
1221 elsif Nkind
(Formal
) = N_Formal_Package_Declaration
then
1227 -- Locate corresponding actual, and check whether it
1228 -- includes a fixed-point type.
1230 Assoc
:= First
(Assoc_List
);
1231 while Present
(Assoc
) loop
1233 Nkind
(Assoc
) = N_Package_Renaming_Declaration
1234 and then Chars
(Defining_Unit_Name
(Assoc
)) =
1235 Chars
(Defining_Identifier
(Formal
));
1240 if Present
(Assoc
) then
1242 -- If formal package declares a fixed-point type,
1243 -- and the user-defined operator is derived from
1244 -- a generic instance package, the fixed-point type
1245 -- does not use the corresponding predefined op.
1247 Ent
:= First_Entity
(Entity
(Name
(Assoc
)));
1248 while Present
(Ent
) loop
1249 if Is_Fixed_Point_Type
(Ent
)
1250 and then Present
(Op
)
1251 and then Is_Generic_Instance
(Scope
(Op
))
1266 Error_Msg_Sloc
:= Sloc
(Node
(Elem
));
1268 ("?instance uses predefined operation, not primitive "
1269 & "operation&#", Actual
, Node
(Elem
));
1275 end Check_Fixed_Point_Actual
;
1277 -------------------------------
1278 -- Has_Fully_Defined_Profile --
1279 -------------------------------
1281 function Has_Fully_Defined_Profile
(Subp
: Entity_Id
) return Boolean is
1282 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean;
1283 -- Determine whethet type Typ is fully defined
1285 ---------------------------
1286 -- Is_Fully_Defined_Type --
1287 ---------------------------
1289 function Is_Fully_Defined_Type
(Typ
: Entity_Id
) return Boolean is
1291 -- A private type without a full view is not fully defined
1293 if Is_Private_Type
(Typ
)
1294 and then No
(Full_View
(Typ
))
1298 -- An incomplete type is never fully defined
1300 elsif Is_Incomplete_Type
(Typ
) then
1303 -- All other types are fully defined
1308 end Is_Fully_Defined_Type
;
1310 -- Local declarations
1314 -- Start of processing for Has_Fully_Defined_Profile
1317 -- Check the parameters
1319 Param
:= First_Formal
(Subp
);
1320 while Present
(Param
) loop
1321 if not Is_Fully_Defined_Type
(Etype
(Param
)) then
1325 Next_Formal
(Param
);
1328 -- Check the return type
1330 return Is_Fully_Defined_Type
(Etype
(Subp
));
1331 end Has_Fully_Defined_Profile
;
1333 ---------------------
1334 -- Matching_Actual --
1335 ---------------------
1337 function Matching_Actual
1339 A_F
: Entity_Id
) return Node_Id
1345 Is_Named_Assoc
:= False;
1347 -- End of list of purely positional parameters
1349 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
1350 Found_Assoc
:= Empty
;
1353 -- Case of positional parameter corresponding to current formal
1355 elsif No
(Selector_Name
(Actual
)) then
1356 Found_Assoc
:= Actual
;
1357 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1358 Num_Matched
:= Num_Matched
+ 1;
1361 -- Otherwise scan list of named actuals to find the one with the
1362 -- desired name. All remaining actuals have explicit names.
1365 Is_Named_Assoc
:= True;
1366 Found_Assoc
:= Empty
;
1370 while Present
(Actual
) loop
1371 if Nkind
(Actual
) = N_Others_Choice
then
1372 Found_Assoc
:= Empty
;
1375 elsif Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
1376 Set_Entity
(Selector_Name
(Actual
), A_F
);
1377 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
1378 Generate_Reference
(A_F
, Selector_Name
(Actual
));
1380 Found_Assoc
:= Actual
;
1381 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
1382 Num_Matched
:= Num_Matched
+ 1;
1390 -- Reset for subsequent searches. In most cases the named
1391 -- associations are in order. If they are not, we reorder them
1392 -- to avoid scanning twice the same actual. This is not just a
1393 -- question of efficiency: there may be multiple defaults with
1394 -- boxes that have the same name. In a nested instantiation we
1395 -- insert actuals for those defaults, and cannot rely on their
1396 -- names to disambiguate them.
1398 if Actual
= First_Named
then
1401 elsif Present
(Actual
) then
1402 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1405 Actual
:= First_Named
;
1408 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1409 Set_Used_As_Generic_Actual
(Entity
(Act
));
1413 end Matching_Actual
;
1415 ------------------------------
1416 -- Partial_Parameterization --
1417 ------------------------------
1419 function Partial_Parameterization
return Boolean is
1421 return Others_Present
1422 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1423 end Partial_Parameterization
;
1425 ---------------------
1426 -- Process_Default --
1427 ---------------------
1429 procedure Process_Default
(F
: Entity_Id
) is
1430 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1431 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1437 -- Append copy of formal declaration to associations, and create new
1438 -- defining identifier for it.
1440 Decl
:= New_Copy_Tree
(F
);
1441 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1443 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1444 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1447 Set_Defining_Identifier
(Decl
, Id
);
1450 Append
(Decl
, Assoc_List
);
1452 if No
(Found_Assoc
) then
1454 Make_Generic_Association
(Loc
,
1456 New_Occurrence_Of
(Id
, Loc
),
1457 Explicit_Generic_Actual_Parameter
=> Empty
);
1458 Set_Box_Present
(Default
);
1459 Append
(Default
, Default_Formals
);
1461 end Process_Default
;
1463 ---------------------------------
1464 -- Renames_Standard_Subprogram --
1465 ---------------------------------
1467 function Renames_Standard_Subprogram
(Subp
: Entity_Id
) return Boolean is
1472 while Present
(Id
) loop
1473 if Scope
(Id
) = Standard_Standard
then
1481 end Renames_Standard_Subprogram
;
1483 -------------------------
1484 -- Set_Analyzed_Formal --
1485 -------------------------
1487 procedure Set_Analyzed_Formal
is
1491 while Present
(Analyzed_Formal
) loop
1492 Kind
:= Nkind
(Analyzed_Formal
);
1494 case Nkind
(Formal
) is
1495 when N_Formal_Subprogram_Declaration
=>
1496 exit when Kind
in N_Formal_Subprogram_Declaration
1499 (Defining_Unit_Name
(Specification
(Formal
))) =
1501 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1503 when N_Formal_Package_Declaration
=>
1504 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1505 N_Generic_Package_Declaration
,
1506 N_Package_Declaration
);
1508 when N_Use_Package_Clause
1515 -- Skip freeze nodes, and nodes inserted to replace
1516 -- unrecognized pragmas.
1519 Kind
not in N_Formal_Subprogram_Declaration
1520 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1524 and then Chars
(Defining_Identifier
(Formal
)) =
1525 Chars
(Defining_Identifier
(Analyzed_Formal
));
1528 Next
(Analyzed_Formal
);
1530 end Set_Analyzed_Formal
;
1532 -- Start of processing for Analyze_Associations
1535 Actuals
:= Generic_Associations
(I_Node
);
1537 if Present
(Actuals
) then
1539 -- Check for an Others choice, indicating a partial parameterization
1540 -- for a formal package.
1542 Actual
:= First
(Actuals
);
1543 while Present
(Actual
) loop
1544 if Nkind
(Actual
) = N_Others_Choice
then
1545 Others_Present
:= True;
1546 Others_Choice
:= Actual
;
1548 if Present
(Next
(Actual
)) then
1549 Error_Msg_N
("others must be last association", Actual
);
1552 -- This subprogram is used both for formal packages and for
1553 -- instantiations. For the latter, associations must all be
1556 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1557 and then Comes_From_Source
(I_Node
)
1560 ("others association not allowed in an instance",
1564 -- In any case, nothing to do after the others association
1568 elsif Box_Present
(Actual
)
1569 and then Comes_From_Source
(I_Node
)
1570 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1573 ("box association not allowed in an instance", Actual
);
1579 -- If named associations are present, save first named association
1580 -- (it may of course be Empty) to facilitate subsequent name search.
1582 First_Named
:= First
(Actuals
);
1583 while Present
(First_Named
)
1584 and then Nkind
(First_Named
) /= N_Others_Choice
1585 and then No
(Selector_Name
(First_Named
))
1587 Num_Actuals
:= Num_Actuals
+ 1;
1592 Named
:= First_Named
;
1593 while Present
(Named
) loop
1594 if Nkind
(Named
) /= N_Others_Choice
1595 and then No
(Selector_Name
(Named
))
1597 Error_Msg_N
("invalid positional actual after named one", Named
);
1598 Abandon_Instantiation
(Named
);
1601 -- A named association may lack an actual parameter, if it was
1602 -- introduced for a default subprogram that turns out to be local
1603 -- to the outer instantiation. If it has a box association it must
1604 -- correspond to some formal in the generic.
1606 if Nkind
(Named
) /= N_Others_Choice
1607 and then (Present
(Explicit_Generic_Actual_Parameter
(Named
))
1608 or else Box_Present
(Named
))
1610 Num_Actuals
:= Num_Actuals
+ 1;
1616 if Present
(Formals
) then
1617 Formal
:= First_Non_Pragma
(Formals
);
1618 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1620 if Present
(Actuals
) then
1621 Actual
:= First
(Actuals
);
1623 -- All formals should have default values
1629 while Present
(Formal
) loop
1630 Set_Analyzed_Formal
;
1631 Saved_Formal
:= Next_Non_Pragma
(Formal
);
1633 case Nkind
(Formal
) is
1634 when N_Formal_Object_Declaration
=>
1637 (Defining_Identifier
(Formal
),
1638 Defining_Identifier
(Analyzed_Formal
));
1640 if No
(Match
) and then Partial_Parameterization
then
1641 Process_Default
(Formal
);
1645 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1648 -- For a defaulted in_parameter, create an entry in the
1649 -- the list of defaulted actuals, for GNATProve use. Do
1650 -- not included these defaults for an instance nested
1651 -- within a generic, because the defaults are also used
1652 -- in the analysis of the enclosing generic, and only
1653 -- defaulted subprograms are relevant there.
1655 if No
(Match
) and then not Inside_A_Generic
then
1656 Append_To
(Default_Actuals
,
1657 Make_Generic_Association
(Sloc
(I_Node
),
1660 (Defining_Identifier
(Formal
), Sloc
(I_Node
)),
1661 Explicit_Generic_Actual_Parameter
=>
1662 New_Copy_Tree
(Default_Expression
(Formal
))));
1666 -- If the object is a call to an expression function, this
1667 -- is a freezing point for it.
1669 if Is_Entity_Name
(Match
)
1670 and then Present
(Entity
(Match
))
1672 (Original_Node
(Unit_Declaration_Node
(Entity
(Match
))))
1673 = N_Expression_Function
1675 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1678 when N_Formal_Type_Declaration
=>
1681 (Defining_Identifier
(Formal
),
1682 Defining_Identifier
(Analyzed_Formal
));
1685 if Partial_Parameterization
then
1686 Process_Default
(Formal
);
1689 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1692 Instantiation_Node
, Defining_Identifier
(Formal
));
1694 ("\in instantiation of & declared#",
1695 Instantiation_Node
, Gen_Unit
);
1696 Abandon_Instantiation
(Instantiation_Node
);
1703 (Formal
, Match
, Analyzed_Formal
, Assoc_List
),
1706 -- Warn when an actual is a fixed-point with user-
1707 -- defined promitives. The warning is superfluous
1708 -- if the fornal is private, because there can be
1709 -- no arithmetic operations in the generic so there
1710 -- no danger of confusion.
1712 if Is_Fixed_Point_Type
(Entity
(Match
))
1713 and then not Is_Private_Type
1714 (Defining_Identifier
(Analyzed_Formal
))
1716 Check_Fixed_Point_Actual
(Match
);
1719 -- An instantiation is a freeze point for the actuals,
1720 -- unless this is a rewritten formal package, or the
1721 -- formal is an Ada 2012 formal incomplete type.
1723 if Nkind
(I_Node
) = N_Formal_Package_Declaration
1725 (Ada_Version
>= Ada_2012
1727 Ekind
(Defining_Identifier
(Analyzed_Formal
)) =
1733 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1737 -- A remote access-to-class-wide type is not a legal actual
1738 -- for a generic formal of an access type (E.2.2(17/2)).
1739 -- In GNAT an exception to this rule is introduced when
1740 -- the formal is marked as remote using implementation
1741 -- defined aspect/pragma Remote_Access_Type. In that case
1742 -- the actual must be remote as well.
1744 -- If the current instantiation is the construction of a
1745 -- local copy for a formal package the actuals may be
1746 -- defaulted, and there is no matching actual to check.
1748 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1750 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1751 N_Access_To_Object_Definition
1752 and then Present
(Match
)
1755 Formal_Ent
: constant Entity_Id
:=
1756 Defining_Identifier
(Analyzed_Formal
);
1758 if Is_Remote_Access_To_Class_Wide_Type
(Entity
(Match
))
1759 = Is_Remote_Types
(Formal_Ent
)
1761 -- Remoteness of formal and actual match
1765 elsif Is_Remote_Types
(Formal_Ent
) then
1767 -- Remote formal, non-remote actual
1770 ("actual for& must be remote", Match
, Formal_Ent
);
1773 -- Non-remote formal, remote actual
1776 ("actual for& may not be remote",
1782 when N_Formal_Subprogram_Declaration
=>
1785 (Defining_Unit_Name
(Specification
(Formal
)),
1786 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1788 -- If the formal subprogram has the same name as another
1789 -- formal subprogram of the generic, then a named
1790 -- association is illegal (12.3(9)). Exclude named
1791 -- associations that are generated for a nested instance.
1794 and then Is_Named_Assoc
1795 and then Comes_From_Source
(Found_Assoc
)
1797 Check_Overloaded_Formal_Subprogram
(Formal
);
1800 -- If there is no corresponding actual, this may be case
1801 -- of partial parameterization, or else the formal has a
1802 -- default or a box.
1804 if No
(Match
) and then Partial_Parameterization
then
1805 Process_Default
(Formal
);
1807 if Nkind
(I_Node
) = N_Formal_Package_Declaration
then
1808 Check_Overloaded_Formal_Subprogram
(Formal
);
1812 Append_To
(Assoc_List
,
1813 Instantiate_Formal_Subprogram
1814 (Formal
, Match
, Analyzed_Formal
));
1816 -- An instantiation is a freeze point for the actuals,
1817 -- unless this is a rewritten formal package.
1819 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1820 and then Nkind
(Match
) = N_Identifier
1821 and then Is_Subprogram
(Entity
(Match
))
1823 -- The actual subprogram may rename a routine defined
1824 -- in Standard. Avoid freezing such renamings because
1825 -- subprograms coming from Standard cannot be frozen.
1828 not Renames_Standard_Subprogram
(Entity
(Match
))
1830 -- If the actual subprogram comes from a different
1831 -- unit, it is already frozen, either by a body in
1832 -- that unit or by the end of the declarative part
1833 -- of the unit. This check avoids the freezing of
1834 -- subprograms defined in Standard which are used
1835 -- as generic actuals.
1837 and then In_Same_Code_Unit
(Entity
(Match
), I_Node
)
1838 and then Has_Fully_Defined_Profile
(Entity
(Match
))
1840 -- Mark the subprogram as having a delayed freeze
1841 -- since this may be an out-of-order action.
1843 Set_Has_Delayed_Freeze
(Entity
(Match
));
1844 Append_Elmt
(Entity
(Match
), Actuals_To_Freeze
);
1848 -- If this is a nested generic, preserve default for later
1849 -- instantiations. We do this as well for GNATProve use,
1850 -- so that the list of generic associations is complete.
1852 if No
(Match
) and then Box_Present
(Formal
) then
1854 Subp
: constant Entity_Id
:=
1856 (Specification
(Last
(Assoc_List
)));
1859 Append_To
(Default_Actuals
,
1860 Make_Generic_Association
(Sloc
(I_Node
),
1862 New_Occurrence_Of
(Subp
, Sloc
(I_Node
)),
1863 Explicit_Generic_Actual_Parameter
=>
1864 New_Occurrence_Of
(Subp
, Sloc
(I_Node
))));
1868 when N_Formal_Package_Declaration
=>
1871 (Defining_Identifier
(Formal
),
1872 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1875 if Partial_Parameterization
then
1876 Process_Default
(Formal
);
1879 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1882 Instantiation_Node
, Defining_Identifier
(Formal
));
1884 ("\in instantiation of & declared#",
1885 Instantiation_Node
, Gen_Unit
);
1887 Abandon_Instantiation
(Instantiation_Node
);
1893 (Instantiate_Formal_Package
1894 (Formal
, Match
, Analyzed_Formal
),
1897 -- Determine whether the actual package needs an explicit
1898 -- freeze node. This is only the case if the actual is
1899 -- declared in the same unit and has a body. Normally
1900 -- packages do not have explicit freeze nodes, and gigi
1901 -- only uses them to elaborate entities in a package
1904 Explicit_Freeze_Check
: declare
1905 Actual
: constant Entity_Id
:= Entity
(Match
);
1906 Gen_Par
: Entity_Id
;
1908 Needs_Freezing
: Boolean;
1911 procedure Check_Generic_Parent
;
1912 -- The actual may be an instantiation of a unit
1913 -- declared in a previous instantiation. If that
1914 -- one is also in the current compilation, it must
1915 -- itself be frozen before the actual. The actual
1916 -- may be an instantiation of a generic child unit,
1917 -- in which case the same applies to the instance
1918 -- of the parent which must be frozen before the
1920 -- Should this itself be recursive ???
1922 --------------------------
1923 -- Check_Generic_Parent --
1924 --------------------------
1926 procedure Check_Generic_Parent
is
1927 Inst
: constant Node_Id
:=
1928 Next
(Unit_Declaration_Node
(Actual
));
1934 if Nkind
(Parent
(Actual
)) = N_Package_Specification
1936 Par
:= Scope
(Generic_Parent
(Parent
(Actual
)));
1938 if Is_Generic_Instance
(Par
) then
1941 -- If the actual is a child generic unit, check
1942 -- whether the instantiation of the parent is
1943 -- also local and must also be frozen now. We
1944 -- must retrieve the instance node to locate the
1945 -- parent instance if any.
1947 elsif Ekind
(Par
) = E_Generic_Package
1948 and then Is_Child_Unit
(Gen_Par
)
1949 and then Ekind
(Scope
(Gen_Par
)) =
1952 if Nkind
(Inst
) = N_Package_Instantiation
1953 and then Nkind
(Name
(Inst
)) =
1956 -- Retrieve entity of parent instance
1958 Par
:= Entity
(Prefix
(Name
(Inst
)));
1967 and then Is_Generic_Instance
(Par
)
1968 and then Scope
(Par
) = Current_Scope
1970 (No
(Freeze_Node
(Par
))
1972 not Is_List_Member
(Freeze_Node
(Par
)))
1974 Set_Has_Delayed_Freeze
(Par
);
1975 Append_Elmt
(Par
, Actuals_To_Freeze
);
1977 end Check_Generic_Parent
;
1979 -- Start of processing for Explicit_Freeze_Check
1982 if Present
(Renamed_Entity
(Actual
)) then
1984 Generic_Parent
(Specification
1985 (Unit_Declaration_Node
1986 (Renamed_Entity
(Actual
))));
1989 Generic_Parent
(Specification
1990 (Unit_Declaration_Node
(Actual
)));
1993 if not Expander_Active
1994 or else not Has_Completion
(Actual
)
1995 or else not In_Same_Source_Unit
(I_Node
, Actual
)
1996 or else Is_Frozen
(Actual
)
1998 (Present
(Renamed_Entity
(Actual
))
2000 not In_Same_Source_Unit
2001 (I_Node
, (Renamed_Entity
(Actual
))))
2006 -- Finally we want to exclude such freeze nodes
2007 -- from statement sequences, which freeze
2008 -- everything before them.
2009 -- Is this strictly necessary ???
2011 Needs_Freezing
:= True;
2014 while Present
(S
) loop
2015 if Ekind_In
(S
, E_Block
,
2020 Needs_Freezing
:= False;
2027 if Needs_Freezing
then
2028 Check_Generic_Parent
;
2030 -- If the actual is a renaming of a proper
2031 -- instance of the formal package, indicate
2032 -- that it is the instance that must be frozen.
2034 if Nkind
(Parent
(Actual
)) =
2035 N_Package_Renaming_Declaration
2037 Set_Has_Delayed_Freeze
2038 (Renamed_Entity
(Actual
));
2040 (Renamed_Entity
(Actual
),
2043 Set_Has_Delayed_Freeze
(Actual
);
2044 Append_Elmt
(Actual
, Actuals_To_Freeze
);
2048 end Explicit_Freeze_Check
;
2051 -- For use type and use package appearing in the generic part,
2052 -- we have already copied them, so we can just move them where
2053 -- they belong (we mustn't recopy them since this would mess up
2054 -- the Sloc values).
2056 when N_Use_Package_Clause
2059 if Nkind
(Original_Node
(I_Node
)) =
2060 N_Formal_Package_Declaration
2062 Append
(New_Copy_Tree
(Formal
), Assoc_List
);
2065 Append
(Formal
, Assoc_List
);
2069 raise Program_Error
;
2072 Formal
:= Saved_Formal
;
2073 Next_Non_Pragma
(Analyzed_Formal
);
2076 if Num_Actuals
> Num_Matched
then
2077 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
2079 if Present
(Selector_Name
(Actual
)) then
2081 ("unmatched actual &", Actual
, Selector_Name
(Actual
));
2083 ("\in instantiation of & declared#", Actual
, Gen_Unit
);
2086 ("unmatched actual in instantiation of & declared#",
2091 elsif Present
(Actuals
) then
2093 ("too many actuals in generic instantiation", Instantiation_Node
);
2096 -- An instantiation freezes all generic actuals. The only exceptions
2097 -- to this are incomplete types and subprograms which are not fully
2098 -- defined at the point of instantiation.
2101 Elmt
: Elmt_Id
:= First_Elmt
(Actuals_To_Freeze
);
2103 while Present
(Elmt
) loop
2104 Freeze_Before
(I_Node
, Node
(Elmt
));
2109 -- If there are default subprograms, normalize the tree by adding
2110 -- explicit associations for them. This is required if the instance
2111 -- appears within a generic.
2113 if not Is_Empty_List
(Default_Actuals
) then
2118 Default
:= First
(Default_Actuals
);
2119 while Present
(Default
) loop
2120 Mark_Rewrite_Insertion
(Default
);
2124 if No
(Actuals
) then
2125 Set_Generic_Associations
(I_Node
, Default_Actuals
);
2127 Append_List_To
(Actuals
, Default_Actuals
);
2132 -- If this is a formal package, normalize the parameter list by adding
2133 -- explicit box associations for the formals that are covered by an
2136 if not Is_Empty_List
(Default_Formals
) then
2137 Append_List
(Default_Formals
, Formals
);
2141 end Analyze_Associations
;
2143 -------------------------------
2144 -- Analyze_Formal_Array_Type --
2145 -------------------------------
2147 procedure Analyze_Formal_Array_Type
2148 (T
: in out Entity_Id
;
2154 -- Treated like a non-generic array declaration, with additional
2159 if Nkind
(Def
) = N_Constrained_Array_Definition
then
2160 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
2161 while Present
(DSS
) loop
2162 if Nkind_In
(DSS
, N_Subtype_Indication
,
2164 N_Attribute_Reference
)
2166 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
2173 Array_Type_Declaration
(T
, Def
);
2174 Set_Is_Generic_Type
(Base_Type
(T
));
2176 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
2177 and then No
(Full_View
(Component_Type
(T
)))
2179 Error_Msg_N
("premature usage of incomplete type", Def
);
2181 -- Check that range constraint is not allowed on the component type
2182 -- of a generic formal array type (AARM 12.5.3(3))
2184 elsif Is_Internal
(Component_Type
(T
))
2185 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
2186 and then Nkind
(Original_Node
2187 (Subtype_Indication
(Component_Definition
(Def
)))) =
2188 N_Subtype_Indication
2191 ("in a formal, a subtype indication can only be "
2192 & "a subtype mark (RM 12.5.3(3))",
2193 Subtype_Indication
(Component_Definition
(Def
)));
2196 end Analyze_Formal_Array_Type
;
2198 ---------------------------------------------
2199 -- Analyze_Formal_Decimal_Fixed_Point_Type --
2200 ---------------------------------------------
2202 -- As for other generic types, we create a valid type representation with
2203 -- legal but arbitrary attributes, whose values are never considered
2204 -- static. For all scalar types we introduce an anonymous base type, with
2205 -- the same attributes. We choose the corresponding integer type to be
2206 -- Standard_Integer.
2207 -- Here and in other similar routines, the Sloc of the generated internal
2208 -- type must be the same as the sloc of the defining identifier of the
2209 -- formal type declaration, to provide proper source navigation.
2211 procedure Analyze_Formal_Decimal_Fixed_Point_Type
2215 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2217 Base
: constant Entity_Id
:=
2219 (E_Decimal_Fixed_Point_Type
,
2221 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2223 Int_Base
: constant Entity_Id
:= Standard_Integer
;
2224 Delta_Val
: constant Ureal
:= Ureal_1
;
2225 Digs_Val
: constant Uint
:= Uint_6
;
2227 function Make_Dummy_Bound
return Node_Id
;
2228 -- Return a properly typed universal real literal to use as a bound
2230 ----------------------
2231 -- Make_Dummy_Bound --
2232 ----------------------
2234 function Make_Dummy_Bound
return Node_Id
is
2235 Bound
: constant Node_Id
:= Make_Real_Literal
(Loc
, Ureal_1
);
2237 Set_Etype
(Bound
, Universal_Real
);
2239 end Make_Dummy_Bound
;
2241 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type
2246 Set_Etype
(Base
, Base
);
2247 Set_Size_Info
(Base
, Int_Base
);
2248 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
2249 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
2250 Set_Digits_Value
(Base
, Digs_Val
);
2251 Set_Delta_Value
(Base
, Delta_Val
);
2252 Set_Small_Value
(Base
, Delta_Val
);
2253 Set_Scalar_Range
(Base
,
2255 Low_Bound
=> Make_Dummy_Bound
,
2256 High_Bound
=> Make_Dummy_Bound
));
2258 Set_Is_Generic_Type
(Base
);
2259 Set_Parent
(Base
, Parent
(Def
));
2261 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
2262 Set_Etype
(T
, Base
);
2263 Set_Size_Info
(T
, Int_Base
);
2264 Set_RM_Size
(T
, RM_Size
(Int_Base
));
2265 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
2266 Set_Digits_Value
(T
, Digs_Val
);
2267 Set_Delta_Value
(T
, Delta_Val
);
2268 Set_Small_Value
(T
, Delta_Val
);
2269 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
2270 Set_Is_Constrained
(T
);
2272 Check_Restriction
(No_Fixed_Point
, Def
);
2273 end Analyze_Formal_Decimal_Fixed_Point_Type
;
2275 -------------------------------------------
2276 -- Analyze_Formal_Derived_Interface_Type --
2277 -------------------------------------------
2279 procedure Analyze_Formal_Derived_Interface_Type
2284 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2287 -- Rewrite as a type declaration of a derived type. This ensures that
2288 -- the interface list and primitive operations are properly captured.
2291 Make_Full_Type_Declaration
(Loc
,
2292 Defining_Identifier
=> T
,
2293 Type_Definition
=> Def
));
2295 Set_Is_Generic_Type
(T
);
2296 end Analyze_Formal_Derived_Interface_Type
;
2298 ---------------------------------
2299 -- Analyze_Formal_Derived_Type --
2300 ---------------------------------
2302 procedure Analyze_Formal_Derived_Type
2307 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2308 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
2312 Set_Is_Generic_Type
(T
);
2314 if Private_Present
(Def
) then
2316 Make_Private_Extension_Declaration
(Loc
,
2317 Defining_Identifier
=> T
,
2318 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
2319 Unknown_Discriminants_Present
=> Unk_Disc
,
2320 Subtype_Indication
=> Subtype_Mark
(Def
),
2321 Interface_List
=> Interface_List
(Def
));
2323 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
2324 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
2325 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
2329 Make_Full_Type_Declaration
(Loc
,
2330 Defining_Identifier
=> T
,
2331 Discriminant_Specifications
=>
2332 Discriminant_Specifications
(Parent
(T
)),
2334 Make_Derived_Type_Definition
(Loc
,
2335 Subtype_Indication
=> Subtype_Mark
(Def
)));
2337 Set_Abstract_Present
2338 (Type_Definition
(New_N
), Abstract_Present
(Def
));
2340 (Type_Definition
(New_N
), Limited_Present
(Def
));
2347 if not Is_Composite_Type
(T
) then
2349 ("unknown discriminants not allowed for elementary types", N
);
2351 Set_Has_Unknown_Discriminants
(T
);
2352 Set_Is_Constrained
(T
, False);
2356 -- If the parent type has a known size, so does the formal, which makes
2357 -- legal representation clauses that involve the formal.
2359 Set_Size_Known_At_Compile_Time
2360 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
2361 end Analyze_Formal_Derived_Type
;
2363 ----------------------------------
2364 -- Analyze_Formal_Discrete_Type --
2365 ----------------------------------
2367 -- The operations defined for a discrete types are those of an enumeration
2368 -- type. The size is set to an arbitrary value, for use in analyzing the
2371 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2372 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2376 Base
: constant Entity_Id
:=
2378 (E_Floating_Point_Type
, Current_Scope
,
2379 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2383 Set_Ekind
(T
, E_Enumeration_Subtype
);
2384 Set_Etype
(T
, Base
);
2387 Set_Is_Generic_Type
(T
);
2388 Set_Is_Constrained
(T
);
2390 -- For semantic analysis, the bounds of the type must be set to some
2391 -- non-static value. The simplest is to create attribute nodes for those
2392 -- bounds, that refer to the type itself. These bounds are never
2393 -- analyzed but serve as place-holders.
2396 Make_Attribute_Reference
(Loc
,
2397 Attribute_Name
=> Name_First
,
2398 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2402 Make_Attribute_Reference
(Loc
,
2403 Attribute_Name
=> Name_Last
,
2404 Prefix
=> New_Occurrence_Of
(T
, Loc
));
2407 Set_Scalar_Range
(T
,
2412 Set_Ekind
(Base
, E_Enumeration_Type
);
2413 Set_Etype
(Base
, Base
);
2414 Init_Size
(Base
, 8);
2415 Init_Alignment
(Base
);
2416 Set_Is_Generic_Type
(Base
);
2417 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2418 Set_Parent
(Base
, Parent
(Def
));
2419 end Analyze_Formal_Discrete_Type
;
2421 ----------------------------------
2422 -- Analyze_Formal_Floating_Type --
2423 ---------------------------------
2425 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2426 Base
: constant Entity_Id
:=
2428 (E_Floating_Point_Type
, Current_Scope
,
2429 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2432 -- The various semantic attributes are taken from the predefined type
2433 -- Float, just so that all of them are initialized. Their values are
2434 -- never used because no constant folding or expansion takes place in
2435 -- the generic itself.
2438 Set_Ekind
(T
, E_Floating_Point_Subtype
);
2439 Set_Etype
(T
, Base
);
2440 Set_Size_Info
(T
, (Standard_Float
));
2441 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
2442 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
2443 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
2444 Set_Is_Constrained
(T
);
2446 Set_Is_Generic_Type
(Base
);
2447 Set_Etype
(Base
, Base
);
2448 Set_Size_Info
(Base
, (Standard_Float
));
2449 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
2450 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
2451 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
2452 Set_Parent
(Base
, Parent
(Def
));
2454 Check_Restriction
(No_Floating_Point
, Def
);
2455 end Analyze_Formal_Floating_Type
;
2457 -----------------------------------
2458 -- Analyze_Formal_Interface_Type;--
2459 -----------------------------------
2461 procedure Analyze_Formal_Interface_Type
2466 Loc
: constant Source_Ptr
:= Sloc
(N
);
2471 Make_Full_Type_Declaration
(Loc
,
2472 Defining_Identifier
=> T
,
2473 Type_Definition
=> Def
);
2477 Set_Is_Generic_Type
(T
);
2478 end Analyze_Formal_Interface_Type
;
2480 ---------------------------------
2481 -- Analyze_Formal_Modular_Type --
2482 ---------------------------------
2484 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2486 -- Apart from their entity kind, generic modular types are treated like
2487 -- signed integer types, and have the same attributes.
2489 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2490 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
2491 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
2493 end Analyze_Formal_Modular_Type
;
2495 ---------------------------------------
2496 -- Analyze_Formal_Object_Declaration --
2497 ---------------------------------------
2499 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
2500 E
: constant Node_Id
:= Default_Expression
(N
);
2501 Id
: constant Node_Id
:= Defining_Identifier
(N
);
2508 -- Determine the mode of the formal object
2510 if Out_Present
(N
) then
2511 K
:= E_Generic_In_Out_Parameter
;
2513 if not In_Present
(N
) then
2514 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
2518 K
:= E_Generic_In_Parameter
;
2521 if Present
(Subtype_Mark
(N
)) then
2522 Find_Type
(Subtype_Mark
(N
));
2523 T
:= Entity
(Subtype_Mark
(N
));
2525 -- Verify that there is no redundant null exclusion
2527 if Null_Exclusion_Present
(N
) then
2528 if not Is_Access_Type
(T
) then
2530 ("null exclusion can only apply to an access type", N
);
2532 elsif Can_Never_Be_Null
(T
) then
2534 ("`NOT NULL` not allowed (& already excludes null)", N
, T
);
2538 -- Ada 2005 (AI-423): Formal object with an access definition
2541 Check_Access_Definition
(N
);
2542 T
:= Access_Definition
2544 N
=> Access_Definition
(N
));
2547 if Ekind
(T
) = E_Incomplete_Type
then
2549 Error_Node
: Node_Id
;
2552 if Present
(Subtype_Mark
(N
)) then
2553 Error_Node
:= Subtype_Mark
(N
);
2555 Check_Access_Definition
(N
);
2556 Error_Node
:= Access_Definition
(N
);
2559 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
2563 if K
= E_Generic_In_Parameter
then
2565 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
2567 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
2569 ("generic formal of mode IN must not be of limited type", N
);
2570 Explain_Limited_Type
(T
, N
);
2573 if Is_Abstract_Type
(T
) then
2575 ("generic formal of mode IN must not be of abstract type", N
);
2579 Preanalyze_Spec_Expression
(E
, T
);
2581 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
2583 ("initialization not allowed for limited types", E
);
2584 Explain_Limited_Type
(T
, E
);
2591 -- Case of generic IN OUT parameter
2594 -- If the formal has an unconstrained type, construct its actual
2595 -- subtype, as is done for subprogram formals. In this fashion, all
2596 -- its uses can refer to specific bounds.
2601 if (Is_Array_Type
(T
) and then not Is_Constrained
(T
))
2602 or else (Ekind
(T
) = E_Record_Type
and then Has_Discriminants
(T
))
2605 Non_Freezing_Ref
: constant Node_Id
:=
2606 New_Occurrence_Of
(Id
, Sloc
(Id
));
2610 -- Make sure the actual subtype doesn't generate bogus freezing
2612 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
2613 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
2614 Insert_Before_And_Analyze
(N
, Decl
);
2615 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
2618 Set_Actual_Subtype
(Id
, T
);
2623 ("initialization not allowed for `IN OUT` formals", N
);
2627 if Has_Aspects
(N
) then
2628 Analyze_Aspect_Specifications
(N
, Id
);
2630 end Analyze_Formal_Object_Declaration
;
2632 ----------------------------------------------
2633 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
2634 ----------------------------------------------
2636 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
2640 Loc
: constant Source_Ptr
:= Sloc
(Def
);
2641 Base
: constant Entity_Id
:=
2643 (E_Ordinary_Fixed_Point_Type
, Current_Scope
,
2644 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
2647 -- The semantic attributes are set for completeness only, their values
2648 -- will never be used, since all properties of the type are non-static.
2651 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
2652 Set_Etype
(T
, Base
);
2653 Set_Size_Info
(T
, Standard_Integer
);
2654 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2655 Set_Small_Value
(T
, Ureal_1
);
2656 Set_Delta_Value
(T
, Ureal_1
);
2657 Set_Scalar_Range
(T
,
2659 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
2660 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
2661 Set_Is_Constrained
(T
);
2663 Set_Is_Generic_Type
(Base
);
2664 Set_Etype
(Base
, Base
);
2665 Set_Size_Info
(Base
, Standard_Integer
);
2666 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2667 Set_Small_Value
(Base
, Ureal_1
);
2668 Set_Delta_Value
(Base
, Ureal_1
);
2669 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
2670 Set_Parent
(Base
, Parent
(Def
));
2672 Check_Restriction
(No_Fixed_Point
, Def
);
2673 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
2675 ----------------------------------------
2676 -- Analyze_Formal_Package_Declaration --
2677 ----------------------------------------
2679 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
2680 Gen_Id
: constant Node_Id
:= Name
(N
);
2681 Loc
: constant Source_Ptr
:= Sloc
(N
);
2682 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
2685 Gen_Unit
: Entity_Id
;
2688 Vis_Prims_List
: Elist_Id
:= No_Elist
;
2689 -- List of primitives made temporarily visible in the instantiation
2690 -- to match the visibility of the formal type.
2692 function Build_Local_Package
return Node_Id
;
2693 -- The formal package is rewritten so that its parameters are replaced
2694 -- with corresponding declarations. For parameters with bona fide
2695 -- associations these declarations are created by Analyze_Associations
2696 -- as for a regular instantiation. For boxed parameters, we preserve
2697 -- the formal declarations and analyze them, in order to introduce
2698 -- entities of the right kind in the environment of the formal.
2700 -------------------------
2701 -- Build_Local_Package --
2702 -------------------------
2704 function Build_Local_Package
return Node_Id
is
2706 Pack_Decl
: Node_Id
;
2709 -- Within the formal, the name of the generic package is a renaming
2710 -- of the formal (as for a regular instantiation).
2713 Make_Package_Declaration
(Loc
,
2716 (Specification
(Original_Node
(Gen_Decl
)),
2717 Empty
, Instantiating
=> True));
2720 Make_Package_Renaming_Declaration
(Loc
,
2721 Defining_Unit_Name
=>
2722 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2723 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2725 if Nkind
(Gen_Id
) = N_Identifier
2726 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2729 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2732 -- If the formal is declared with a box, or with an others choice,
2733 -- create corresponding declarations for all entities in the formal
2734 -- part, so that names with the proper types are available in the
2735 -- specification of the formal package.
2737 -- On the other hand, if there are no associations, then all the
2738 -- formals must have defaults, and this will be checked by the
2739 -- call to Analyze_Associations.
2742 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2745 Formal_Decl
: Node_Id
;
2748 -- TBA : for a formal package, need to recurse ???
2753 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2754 while Present
(Formal_Decl
) loop
2758 (Formal_Decl
, Empty
, Instantiating
=> True));
2763 -- If generic associations are present, use Analyze_Associations to
2764 -- create the proper renaming declarations.
2768 Act_Tree
: constant Node_Id
:=
2770 (Original_Node
(Gen_Decl
), Empty
,
2771 Instantiating
=> True);
2774 Generic_Renamings
.Set_Last
(0);
2775 Generic_Renamings_HTable
.Reset
;
2776 Instantiation_Node
:= N
;
2779 Analyze_Associations
2780 (I_Node
=> Original_Node
(N
),
2781 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
2782 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
2784 Vis_Prims_List
:= Check_Hidden_Primitives
(Decls
);
2788 Append
(Renaming
, To
=> Decls
);
2790 -- Add generated declarations ahead of local declarations in
2793 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2794 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2797 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2802 end Build_Local_Package
;
2806 Save_ISMP
: constant Boolean := Ignore_SPARK_Mode_Pragmas_In_Instance
;
2807 -- Save flag Ignore_SPARK_Mode_Pragmas_In_Instance for restore on exit
2809 Associations
: Boolean := True;
2811 Parent_Installed
: Boolean := False;
2812 Parent_Instance
: Entity_Id
;
2813 Renaming_In_Par
: Entity_Id
;
2815 -- Start of processing for Analyze_Formal_Package_Declaration
2818 Check_Text_IO_Special_Unit
(Gen_Id
);
2821 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2822 Gen_Unit
:= Entity
(Gen_Id
);
2824 -- Check for a formal package that is a package renaming
2826 if Present
(Renamed_Object
(Gen_Unit
)) then
2828 -- Indicate that unit is used, before replacing it with renamed
2829 -- entity for use below.
2831 if In_Extended_Main_Source_Unit
(N
) then
2832 Set_Is_Instantiated
(Gen_Unit
);
2833 Generate_Reference
(Gen_Unit
, N
);
2836 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2839 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2840 Error_Msg_N
("expect generic package name", Gen_Id
);
2844 elsif Gen_Unit
= Current_Scope
then
2846 ("generic package cannot be used as a formal package of itself",
2851 elsif In_Open_Scopes
(Gen_Unit
) then
2852 if Is_Compilation_Unit
(Gen_Unit
)
2853 and then Is_Child_Unit
(Current_Scope
)
2855 -- Special-case the error when the formal is a parent, and
2856 -- continue analysis to minimize cascaded errors.
2859 ("generic parent cannot be used as formal package of a child "
2864 ("generic package cannot be used as a formal package within "
2865 & "itself", Gen_Id
);
2871 -- Check that name of formal package does not hide name of generic,
2872 -- or its leading prefix. This check must be done separately because
2873 -- the name of the generic has already been analyzed.
2876 Gen_Name
: Entity_Id
;
2880 while Nkind
(Gen_Name
) = N_Expanded_Name
loop
2881 Gen_Name
:= Prefix
(Gen_Name
);
2884 if Chars
(Gen_Name
) = Chars
(Pack_Id
) then
2886 ("& is hidden within declaration of formal package",
2892 or else No
(Generic_Associations
(N
))
2893 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2895 Associations
:= False;
2898 -- If there are no generic associations, the generic parameters appear
2899 -- as local entities and are instantiated like them. We copy the generic
2900 -- package declaration as if it were an instantiation, and analyze it
2901 -- like a regular package, except that we treat the formals as
2902 -- additional visible components.
2904 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2906 if In_Extended_Main_Source_Unit
(N
) then
2907 Set_Is_Instantiated
(Gen_Unit
);
2908 Generate_Reference
(Gen_Unit
, N
);
2911 Formal
:= New_Copy
(Pack_Id
);
2912 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
2914 -- Make local generic without formals. The formals will be replaced with
2915 -- internal declarations.
2918 New_N
:= Build_Local_Package
;
2920 -- If there are errors in the parameter list, Analyze_Associations
2921 -- raises Instantiation_Error. Patch the declaration to prevent further
2922 -- exception propagation.
2925 when Instantiation_Error
=>
2926 Enter_Name
(Formal
);
2927 Set_Ekind
(Formal
, E_Variable
);
2928 Set_Etype
(Formal
, Any_Type
);
2929 Restore_Hidden_Primitives
(Vis_Prims_List
);
2931 if Parent_Installed
then
2939 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2940 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2941 Set_Instance_Env
(Gen_Unit
, Formal
);
2942 Set_Is_Generic_Instance
(Formal
);
2944 Enter_Name
(Formal
);
2945 Set_Ekind
(Formal
, E_Package
);
2946 Set_Etype
(Formal
, Standard_Void_Type
);
2947 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2948 Push_Scope
(Formal
);
2950 -- Manually set the SPARK_Mode from the context because the package
2951 -- declaration is never analyzed.
2953 Set_SPARK_Pragma
(Formal
, SPARK_Mode_Pragma
);
2954 Set_SPARK_Aux_Pragma
(Formal
, SPARK_Mode_Pragma
);
2955 Set_SPARK_Pragma_Inherited
(Formal
);
2956 Set_SPARK_Aux_Pragma_Inherited
(Formal
);
2958 if Is_Child_Unit
(Gen_Unit
) and then Parent_Installed
then
2960 -- Similarly, we have to make the name of the formal visible in the
2961 -- parent instance, to resolve properly fully qualified names that
2962 -- may appear in the generic unit. The parent instance has been
2963 -- placed on the scope stack ahead of the current scope.
2965 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2968 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2969 Set_Ekind
(Renaming_In_Par
, E_Package
);
2970 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2971 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2972 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2973 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2974 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2977 -- A formal package declaration behaves as a package instantiation with
2978 -- respect to SPARK_Mode "off". If the annotation is "off" or altogether
2979 -- missing, set the global flag which signals Analyze_Pragma to ingnore
2980 -- all SPARK_Mode pragmas within the generic_package_name.
2982 if SPARK_Mode
/= On
then
2983 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
2985 -- Mark the formal spec in case the body is instantiated at a later
2986 -- pass. This preserves the original context in effect for the body.
2988 Set_Ignore_SPARK_Mode_Pragmas
(Formal
);
2991 Analyze
(Specification
(N
));
2993 -- The formals for which associations are provided are not visible
2994 -- outside of the formal package. The others are still declared by a
2995 -- formal parameter declaration.
2997 -- If there are no associations, the only local entity to hide is the
2998 -- generated package renaming itself.
3004 E
:= First_Entity
(Formal
);
3005 while Present
(E
) loop
3006 if Associations
and then not Is_Generic_Formal
(E
) then
3010 if Ekind
(E
) = E_Package
and then Renamed_Entity
(E
) = Formal
then
3019 End_Package_Scope
(Formal
);
3020 Restore_Hidden_Primitives
(Vis_Prims_List
);
3022 if Parent_Installed
then
3028 -- Inside the generic unit, the formal package is a regular package, but
3029 -- no body is needed for it. Note that after instantiation, the defining
3030 -- unit name we need is in the new tree and not in the original (see
3031 -- Package_Instantiation). A generic formal package is an instance, and
3032 -- can be used as an actual for an inner instance.
3034 Set_Has_Completion
(Formal
, True);
3036 -- Add semantic information to the original defining identifier for ASIS
3039 Set_Ekind
(Pack_Id
, E_Package
);
3040 Set_Etype
(Pack_Id
, Standard_Void_Type
);
3041 Set_Scope
(Pack_Id
, Scope
(Formal
));
3042 Set_Has_Completion
(Pack_Id
, True);
3045 if Has_Aspects
(N
) then
3046 Analyze_Aspect_Specifications
(N
, Pack_Id
);
3049 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Save_ISMP
;
3050 end Analyze_Formal_Package_Declaration
;
3052 ---------------------------------
3053 -- Analyze_Formal_Private_Type --
3054 ---------------------------------
3056 procedure Analyze_Formal_Private_Type
3062 New_Private_Type
(N
, T
, Def
);
3064 -- Set the size to an arbitrary but legal value
3066 Set_Size_Info
(T
, Standard_Integer
);
3067 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3068 end Analyze_Formal_Private_Type
;
3070 ------------------------------------
3071 -- Analyze_Formal_Incomplete_Type --
3072 ------------------------------------
3074 procedure Analyze_Formal_Incomplete_Type
3080 Set_Ekind
(T
, E_Incomplete_Type
);
3082 Set_Private_Dependents
(T
, New_Elmt_List
);
3084 if Tagged_Present
(Def
) then
3085 Set_Is_Tagged_Type
(T
);
3086 Make_Class_Wide_Type
(T
);
3087 Set_Direct_Primitive_Operations
(T
, New_Elmt_List
);
3089 end Analyze_Formal_Incomplete_Type
;
3091 ----------------------------------------
3092 -- Analyze_Formal_Signed_Integer_Type --
3093 ----------------------------------------
3095 procedure Analyze_Formal_Signed_Integer_Type
3099 Base
: constant Entity_Id
:=
3101 (E_Signed_Integer_Type
,
3103 Sloc
(Defining_Identifier
(Parent
(Def
))), 'G');
3108 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
3109 Set_Etype
(T
, Base
);
3110 Set_Size_Info
(T
, Standard_Integer
);
3111 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
3112 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
3113 Set_Is_Constrained
(T
);
3115 Set_Is_Generic_Type
(Base
);
3116 Set_Size_Info
(Base
, Standard_Integer
);
3117 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
3118 Set_Etype
(Base
, Base
);
3119 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
3120 Set_Parent
(Base
, Parent
(Def
));
3121 end Analyze_Formal_Signed_Integer_Type
;
3123 -------------------------------------------
3124 -- Analyze_Formal_Subprogram_Declaration --
3125 -------------------------------------------
3127 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
3128 Spec
: constant Node_Id
:= Specification
(N
);
3129 Def
: constant Node_Id
:= Default_Name
(N
);
3130 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
3138 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
3139 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
3143 Analyze_Subprogram_Declaration
(N
);
3144 Set_Is_Formal_Subprogram
(Nam
);
3145 Set_Has_Completion
(Nam
);
3147 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
3148 Set_Is_Abstract_Subprogram
(Nam
);
3150 Set_Is_Dispatching_Operation
(Nam
);
3152 -- A formal abstract procedure cannot have a null default
3153 -- (RM 12.6(4.1/2)).
3155 if Nkind
(Spec
) = N_Procedure_Specification
3156 and then Null_Present
(Spec
)
3159 ("a formal abstract subprogram cannot default to null", Spec
);
3163 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
3165 if No
(Ctrl_Type
) then
3167 ("abstract formal subprogram must have a controlling type",
3170 elsif Ada_Version
>= Ada_2012
3171 and then Is_Incomplete_Type
(Ctrl_Type
)
3174 ("controlling type of abstract formal subprogram cannot "
3175 & "be incomplete type", N
, Ctrl_Type
);
3178 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
3183 -- Default name is resolved at the point of instantiation
3185 if Box_Present
(N
) then
3188 -- Else default is bound at the point of generic declaration
3190 elsif Present
(Def
) then
3191 if Nkind
(Def
) = N_Operator_Symbol
then
3192 Find_Direct_Name
(Def
);
3194 elsif Nkind
(Def
) /= N_Attribute_Reference
then
3198 -- For an attribute reference, analyze the prefix and verify
3199 -- that it has the proper profile for the subprogram.
3201 Analyze
(Prefix
(Def
));
3202 Valid_Default_Attribute
(Nam
, Def
);
3206 -- Default name may be overloaded, in which case the interpretation
3207 -- with the correct profile must be selected, as for a renaming.
3208 -- If the definition is an indexed component, it must denote a
3209 -- member of an entry family. If it is a selected component, it
3210 -- can be a protected operation.
3212 if Etype
(Def
) = Any_Type
then
3215 elsif Nkind
(Def
) = N_Selected_Component
then
3216 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
3217 Error_Msg_N
("expect valid subprogram name as default", Def
);
3220 elsif Nkind
(Def
) = N_Indexed_Component
then
3221 if Is_Entity_Name
(Prefix
(Def
)) then
3222 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
3223 Error_Msg_N
("expect valid subprogram name as default", Def
);
3226 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
3227 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
3230 Error_Msg_N
("expect valid subprogram name as default", Def
);
3234 Error_Msg_N
("expect valid subprogram name as default", Def
);
3238 elsif Nkind
(Def
) = N_Character_Literal
then
3240 -- Needs some type checks: subprogram should be parameterless???
3242 Resolve
(Def
, (Etype
(Nam
)));
3244 elsif not Is_Entity_Name
(Def
)
3245 or else not Is_Overloadable
(Entity
(Def
))
3247 Error_Msg_N
("expect valid subprogram name as default", Def
);
3250 elsif not Is_Overloaded
(Def
) then
3251 Subp
:= Entity
(Def
);
3254 Error_Msg_N
("premature usage of formal subprogram", Def
);
3256 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
3257 Error_Msg_N
("no visible entity matches specification", Def
);
3260 -- More than one interpretation, so disambiguate as for a renaming
3265 I1
: Interp_Index
:= 0;
3271 Get_First_Interp
(Def
, I
, It
);
3272 while Present
(It
.Nam
) loop
3273 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
3274 if Subp
/= Any_Id
then
3275 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
3277 if It1
= No_Interp
then
3278 Error_Msg_N
("ambiguous default subprogram", Def
);
3291 Get_Next_Interp
(I
, It
);
3295 if Subp
/= Any_Id
then
3297 -- Subprogram found, generate reference to it
3299 Set_Entity
(Def
, Subp
);
3300 Generate_Reference
(Subp
, Def
);
3303 Error_Msg_N
("premature usage of formal subprogram", Def
);
3305 elsif Ekind
(Subp
) /= E_Operator
then
3306 Check_Mode_Conformant
(Subp
, Nam
);
3310 Error_Msg_N
("no visible subprogram matches specification", N
);
3316 if Has_Aspects
(N
) then
3317 Analyze_Aspect_Specifications
(N
, Nam
);
3320 end Analyze_Formal_Subprogram_Declaration
;
3322 -------------------------------------
3323 -- Analyze_Formal_Type_Declaration --
3324 -------------------------------------
3326 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
3327 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
3331 T
:= Defining_Identifier
(N
);
3333 if Present
(Discriminant_Specifications
(N
))
3334 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
3337 ("discriminants not allowed for this formal type", T
);
3340 -- Enter the new name, and branch to specific routine
3343 when N_Formal_Private_Type_Definition
=>
3344 Analyze_Formal_Private_Type
(N
, T
, Def
);
3346 when N_Formal_Derived_Type_Definition
=>
3347 Analyze_Formal_Derived_Type
(N
, T
, Def
);
3349 when N_Formal_Incomplete_Type_Definition
=>
3350 Analyze_Formal_Incomplete_Type
(T
, Def
);
3352 when N_Formal_Discrete_Type_Definition
=>
3353 Analyze_Formal_Discrete_Type
(T
, Def
);
3355 when N_Formal_Signed_Integer_Type_Definition
=>
3356 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
3358 when N_Formal_Modular_Type_Definition
=>
3359 Analyze_Formal_Modular_Type
(T
, Def
);
3361 when N_Formal_Floating_Point_Definition
=>
3362 Analyze_Formal_Floating_Type
(T
, Def
);
3364 when N_Formal_Ordinary_Fixed_Point_Definition
=>
3365 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
3367 when N_Formal_Decimal_Fixed_Point_Definition
=>
3368 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
3370 when N_Array_Type_Definition
=>
3371 Analyze_Formal_Array_Type
(T
, Def
);
3373 when N_Access_Function_Definition
3374 | N_Access_Procedure_Definition
3375 | N_Access_To_Object_Definition
3377 Analyze_Generic_Access_Type
(T
, Def
);
3379 -- Ada 2005: a interface declaration is encoded as an abstract
3380 -- record declaration or a abstract type derivation.
3382 when N_Record_Definition
=>
3383 Analyze_Formal_Interface_Type
(N
, T
, Def
);
3385 when N_Derived_Type_Definition
=>
3386 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
3392 raise Program_Error
;
3395 Set_Is_Generic_Type
(T
);
3397 if Has_Aspects
(N
) then
3398 Analyze_Aspect_Specifications
(N
, T
);
3400 end Analyze_Formal_Type_Declaration
;
3402 ------------------------------------
3403 -- Analyze_Function_Instantiation --
3404 ------------------------------------
3406 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
3408 Analyze_Subprogram_Instantiation
(N
, E_Function
);
3409 end Analyze_Function_Instantiation
;
3411 ---------------------------------
3412 -- Analyze_Generic_Access_Type --
3413 ---------------------------------
3415 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
3419 if Nkind
(Def
) = N_Access_To_Object_Definition
then
3420 Access_Type_Declaration
(T
, Def
);
3422 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
3423 and then No
(Full_View
(Designated_Type
(T
)))
3424 and then not Is_Generic_Type
(Designated_Type
(T
))
3426 Error_Msg_N
("premature usage of incomplete type", Def
);
3428 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
3430 ("only a subtype mark is allowed in a formal", Def
);
3434 Access_Subprogram_Declaration
(T
, Def
);
3436 end Analyze_Generic_Access_Type
;
3438 ---------------------------------
3439 -- Analyze_Generic_Formal_Part --
3440 ---------------------------------
3442 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
3443 Gen_Parm_Decl
: Node_Id
;
3446 -- The generic formals are processed in the scope of the generic unit,
3447 -- where they are immediately visible. The scope is installed by the
3450 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
3451 while Present
(Gen_Parm_Decl
) loop
3452 Analyze
(Gen_Parm_Decl
);
3453 Next
(Gen_Parm_Decl
);
3456 Generate_Reference_To_Generic_Formals
(Current_Scope
);
3457 end Analyze_Generic_Formal_Part
;
3459 ------------------------------------------
3460 -- Analyze_Generic_Package_Declaration --
3461 ------------------------------------------
3463 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
3464 Decls
: constant List_Id
:= Visible_Declarations
(Specification
(N
));
3465 Loc
: constant Source_Ptr
:= Sloc
(N
);
3471 Save_Parent
: Node_Id
;
3474 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3476 -- A generic may grant access to its private enclosing context depending
3477 -- on the placement of its corresponding body. From elaboration point of
3478 -- view, the flow of execution may enter this private context, and then
3479 -- reach an external unit, thus producing a dependency on that external
3480 -- unit. For such a path to be properly discovered and encoded in the
3481 -- ALI file of the main unit, let the ABE mechanism process the body of
3482 -- the main unit, and encode all relevant invocation constructs and the
3483 -- relations between them.
3485 Mark_Save_Invocation_Graph_Of_Body
;
3487 -- We introduce a renaming of the enclosing package, to have a usable
3488 -- entity as the prefix of an expanded name for a local entity of the
3489 -- form Par.P.Q, where P is the generic package. This is because a local
3490 -- entity named P may hide it, so that the usual visibility rules in
3491 -- the instance will not resolve properly.
3494 Make_Package_Renaming_Declaration
(Loc
,
3495 Defining_Unit_Name
=>
3496 Make_Defining_Identifier
(Loc
,
3497 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
3499 Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
3501 -- The declaration is inserted before other declarations, but before
3502 -- pragmas that may be library-unit pragmas and must appear before other
3503 -- declarations. The pragma Compile_Time_Error is not in this class, and
3504 -- may contain an expression that includes such a qualified name, so the
3505 -- renaming declaration must appear before it.
3507 -- Are there other pragmas that require this special handling ???
3509 if Present
(Decls
) then
3510 Decl
:= First
(Decls
);
3511 while Present
(Decl
)
3512 and then Nkind
(Decl
) = N_Pragma
3513 and then Get_Pragma_Id
(Decl
) /= Pragma_Compile_Time_Error
3518 if Present
(Decl
) then
3519 Insert_Before
(Decl
, Renaming
);
3521 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
3525 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
3528 -- Create copy of generic unit, and save for instantiation. If the unit
3529 -- is a child unit, do not copy the specifications for the parent, which
3530 -- are not part of the generic tree.
3532 Save_Parent
:= Parent_Spec
(N
);
3533 Set_Parent_Spec
(N
, Empty
);
3535 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3536 Set_Parent_Spec
(New_N
, Save_Parent
);
3539 -- Once the contents of the generic copy and the template are swapped,
3540 -- do the same for their respective aspect specifications.
3542 Exchange_Aspects
(N
, New_N
);
3544 -- Collect all contract-related source pragmas found within the template
3545 -- and attach them to the contract of the package spec. This contract is
3546 -- used in the capture of global references within annotations.
3548 Create_Generic_Contract
(N
);
3550 Id
:= Defining_Entity
(N
);
3551 Generate_Definition
(Id
);
3553 -- Expansion is not applied to generic units
3558 Set_Ekind
(Id
, E_Generic_Package
);
3559 Set_Etype
(Id
, Standard_Void_Type
);
3561 -- Set SPARK_Mode from context
3563 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3564 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
3565 Set_SPARK_Pragma_Inherited
(Id
);
3566 Set_SPARK_Aux_Pragma_Inherited
(Id
);
3568 -- Preserve relevant elaboration-related attributes of the context which
3569 -- are no longer available or very expensive to recompute once analysis,
3570 -- resolution, and expansion are over.
3572 Mark_Elaboration_Attributes
3577 -- Analyze aspects now, so that generated pragmas appear in the
3578 -- declarations before building and analyzing the generic copy.
3580 if Has_Aspects
(N
) then
3581 Analyze_Aspect_Specifications
(N
, Id
);
3585 Enter_Generic_Scope
(Id
);
3586 Set_Inner_Instances
(Id
, New_Elmt_List
);
3588 Set_Categorization_From_Pragmas
(N
);
3589 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3591 -- Link the declaration of the generic homonym in the generic copy to
3592 -- the package it renames, so that it is always resolved properly.
3594 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
3595 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
3597 -- For a library unit, we have reconstructed the entity for the unit,
3598 -- and must reset it in the library tables.
3600 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3601 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3604 Analyze_Generic_Formal_Part
(N
);
3606 -- After processing the generic formals, analysis proceeds as for a
3607 -- non-generic package.
3609 Analyze
(Specification
(N
));
3611 Validate_Categorization_Dependency
(N
, Id
);
3615 End_Package_Scope
(Id
);
3616 Exit_Generic_Scope
(Id
);
3618 -- If the generic appears within a package unit, the body of that unit
3619 -- has to be present for instantiation and inlining.
3621 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
then
3622 Set_Body_Needed_For_Inlining
3623 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3626 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3627 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
3628 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
3629 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
3632 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3633 Validate_RT_RAT_Component
(N
);
3635 -- If this is a spec without a body, check that generic parameters
3638 if not Body_Required
(Parent
(N
)) then
3639 Check_References
(Id
);
3643 -- If there is a specified storage pool in the context, create an
3644 -- aspect on the package declaration, so that it is used in any
3645 -- instance that does not override it.
3647 if Present
(Default_Pool
) then
3653 Make_Aspect_Specification
(Loc
,
3654 Identifier
=> Make_Identifier
(Loc
, Name_Default_Storage_Pool
),
3655 Expression
=> New_Copy
(Default_Pool
));
3657 if No
(Aspect_Specifications
(Specification
(N
))) then
3658 Set_Aspect_Specifications
(Specification
(N
), New_List
(ASN
));
3660 Append
(ASN
, Aspect_Specifications
(Specification
(N
)));
3664 end Analyze_Generic_Package_Declaration
;
3666 --------------------------------------------
3667 -- Analyze_Generic_Subprogram_Declaration --
3668 --------------------------------------------
3670 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
3674 Result_Type
: Entity_Id
;
3675 Save_Parent
: Node_Id
;
3680 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3682 -- A generic may grant access to its private enclosing context depending
3683 -- on the placement of its corresponding body. From elaboration point of
3684 -- view, the flow of execution may enter this private context, and then
3685 -- reach an external unit, thus producing a dependency on that external
3686 -- unit. For such a path to be properly discovered and encoded in the
3687 -- ALI file of the main unit, let the ABE mechanism process the body of
3688 -- the main unit, and encode all relevant invocation constructs and the
3689 -- relations between them.
3691 Mark_Save_Invocation_Graph_Of_Body
;
3693 -- Create copy of generic unit, and save for instantiation. If the unit
3694 -- is a child unit, do not copy the specifications for the parent, which
3695 -- are not part of the generic tree.
3697 Save_Parent
:= Parent_Spec
(N
);
3698 Set_Parent_Spec
(N
, Empty
);
3700 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
3701 Set_Parent_Spec
(New_N
, Save_Parent
);
3704 -- Once the contents of the generic copy and the template are swapped,
3705 -- do the same for their respective aspect specifications.
3707 Exchange_Aspects
(N
, New_N
);
3709 -- Collect all contract-related source pragmas found within the template
3710 -- and attach them to the contract of the subprogram spec. This contract
3711 -- is used in the capture of global references within annotations.
3713 Create_Generic_Contract
(N
);
3715 Spec
:= Specification
(N
);
3716 Id
:= Defining_Entity
(Spec
);
3717 Generate_Definition
(Id
);
3719 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
3721 ("operator symbol not allowed for generic subprogram", Id
);
3727 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
3729 -- Analyze the aspects of the generic copy to ensure that all generated
3730 -- pragmas (if any) perform their semantic effects.
3732 if Has_Aspects
(N
) then
3733 Analyze_Aspect_Specifications
(N
, Id
);
3737 Enter_Generic_Scope
(Id
);
3738 Set_Inner_Instances
(Id
, New_Elmt_List
);
3739 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
3741 Analyze_Generic_Formal_Part
(N
);
3743 if Nkind
(Spec
) = N_Function_Specification
then
3744 Set_Ekind
(Id
, E_Generic_Function
);
3746 Set_Ekind
(Id
, E_Generic_Procedure
);
3749 -- Set SPARK_Mode from context
3751 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
3752 Set_SPARK_Pragma_Inherited
(Id
);
3754 -- Preserve relevant elaboration-related attributes of the context which
3755 -- are no longer available or very expensive to recompute once analysis,
3756 -- resolution, and expansion are over.
3758 Mark_Elaboration_Attributes
3763 Formals
:= Parameter_Specifications
(Spec
);
3765 if Present
(Formals
) then
3766 Process_Formals
(Formals
, Spec
);
3769 if Nkind
(Spec
) = N_Function_Specification
then
3770 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
3771 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
3772 Set_Etype
(Id
, Result_Type
);
3774 -- Check restriction imposed by AI05-073: a generic function
3775 -- cannot return an abstract type or an access to such.
3777 -- This is a binding interpretation should it apply to earlier
3778 -- versions of Ada as well as Ada 2012???
3780 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
3781 and then Ada_Version
>= Ada_2012
3784 ("generic function cannot have an access result "
3785 & "that designates an abstract type", Spec
);
3789 Find_Type
(Result_Definition
(Spec
));
3790 Typ
:= Entity
(Result_Definition
(Spec
));
3792 if Is_Abstract_Type
(Typ
)
3793 and then Ada_Version
>= Ada_2012
3796 ("generic function cannot have abstract result type", Spec
);
3799 -- If a null exclusion is imposed on the result type, then create
3800 -- a null-excluding itype (an access subtype) and use it as the
3801 -- function's Etype.
3803 if Is_Access_Type
(Typ
)
3804 and then Null_Exclusion_Present
(Spec
)
3807 Create_Null_Excluding_Itype
3809 Related_Nod
=> Spec
,
3810 Scope_Id
=> Defining_Unit_Name
(Spec
)));
3812 Set_Etype
(Id
, Typ
);
3817 Set_Etype
(Id
, Standard_Void_Type
);
3820 -- For a library unit, we have reconstructed the entity for the unit,
3821 -- and must reset it in the library tables. We also make sure that
3822 -- Body_Required is set properly in the original compilation unit node.
3824 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3825 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
3826 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
3829 -- If the generic appears within a package unit, the body of that unit
3830 -- has to be present for instantiation and inlining.
3832 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
3833 and then Unit_Requires_Body
(Id
)
3835 Set_Body_Needed_For_Inlining
3836 (Defining_Entity
(Unit
(Cunit
(Current_Sem_Unit
))));
3839 Set_Categorization_From_Pragmas
(N
);
3840 Validate_Categorization_Dependency
(N
, Id
);
3842 -- Capture all global references that occur within the profile of the
3843 -- generic subprogram. Aspects are not part of this processing because
3844 -- they must be delayed. If processed now, Save_Global_References will
3845 -- destroy the Associated_Node links and prevent the capture of global
3846 -- references when the contract of the generic subprogram is analyzed.
3848 Save_Global_References
(Original_Node
(N
));
3852 Exit_Generic_Scope
(Id
);
3853 Generate_Reference_To_Formals
(Id
);
3855 List_Inherited_Pre_Post_Aspects
(Id
);
3856 end Analyze_Generic_Subprogram_Declaration
;
3858 -----------------------------------
3859 -- Analyze_Package_Instantiation --
3860 -----------------------------------
3862 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
3863 -- must be replaced by gotos which jump to the end of the routine in order
3864 -- to restore the Ghost and SPARK modes.
3866 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
3867 Has_Inline_Always
: Boolean := False;
3869 procedure Delay_Descriptors
(E
: Entity_Id
);
3870 -- Delay generation of subprogram descriptors for given entity
3872 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean;
3873 -- If inlining is active and the generic contains inlined subprograms,
3874 -- we instantiate the body. This may cause superfluous instantiations,
3875 -- but it is simpler than detecting the need for the body at the point
3876 -- of inlining, when the context of the instance is not available.
3878 -----------------------
3879 -- Delay_Descriptors --
3880 -----------------------
3882 procedure Delay_Descriptors
(E
: Entity_Id
) is
3884 if not Delay_Subprogram_Descriptors
(E
) then
3885 Set_Delay_Subprogram_Descriptors
(E
);
3886 Pending_Descriptor
.Append
(E
);
3888 end Delay_Descriptors
;
3890 -----------------------
3891 -- Might_Inline_Subp --
3892 -----------------------
3894 function Might_Inline_Subp
(Gen_Unit
: Entity_Id
) return Boolean is
3898 if not Inline_Processing_Required
then
3902 E
:= First_Entity
(Gen_Unit
);
3903 while Present
(E
) loop
3904 if Is_Subprogram
(E
) and then Is_Inlined
(E
) then
3905 -- Remember if there are any subprograms with Inline_Always
3907 if Has_Pragma_Inline_Always
(E
) then
3908 Has_Inline_Always
:= True;
3919 end Might_Inline_Subp
;
3921 -- Local declarations
3923 Gen_Id
: constant Node_Id
:= Name
(N
);
3924 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
3925 Is_Actual_Pack
: constant Boolean := Is_Internal
(Inst_Id
);
3926 Loc
: constant Source_Ptr
:= Sloc
(N
);
3928 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
3929 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
3930 Saved_ISMP
: constant Boolean :=
3931 Ignore_SPARK_Mode_Pragmas_In_Instance
;
3932 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
3933 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
3934 -- Save the Ghost and SPARK mode-related data to restore on exit
3936 Saved_Style_Check
: constant Boolean := Style_Check
;
3937 -- Save style check mode for restore on exit
3940 Act_Decl_Name
: Node_Id
;
3941 Act_Decl_Id
: Entity_Id
;
3944 Env_Installed
: Boolean := False;
3947 Gen_Unit
: Entity_Id
;
3948 Inline_Now
: Boolean := False;
3949 Needs_Body
: Boolean;
3950 Parent_Installed
: Boolean := False;
3951 Renaming_List
: List_Id
;
3952 Unit_Renaming
: Node_Id
;
3954 Vis_Prims_List
: Elist_Id
:= No_Elist
;
3955 -- List of primitives made temporarily visible in the instantiation
3956 -- to match the visibility of the formal type
3958 -- Start of processing for Analyze_Package_Instantiation
3961 -- Preserve relevant elaboration-related attributes of the context which
3962 -- are no longer available or very expensive to recompute once analysis,
3963 -- resolution, and expansion are over.
3965 Mark_Elaboration_Attributes
3972 Check_SPARK_05_Restriction
("generic is not allowed", N
);
3974 -- Very first thing: check for Text_IO special unit in case we are
3975 -- instantiating one of the children of [[Wide_]Wide_]Text_IO.
3977 Check_Text_IO_Special_Unit
(Name
(N
));
3979 -- Make node global for error reporting
3981 Instantiation_Node
:= N
;
3983 -- Case of instantiation of a generic package
3985 if Nkind
(N
) = N_Package_Instantiation
then
3986 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3987 Set_Comes_From_Source
(Act_Decl_Id
, True);
3989 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
3991 Make_Defining_Program_Unit_Name
(Loc
,
3993 New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
3994 Defining_Identifier
=> Act_Decl_Id
);
3996 Act_Decl_Name
:= Act_Decl_Id
;
3999 -- Case of instantiation of a formal package
4002 Act_Decl_Id
:= Defining_Identifier
(N
);
4003 Act_Decl_Name
:= Act_Decl_Id
;
4006 Generate_Definition
(Act_Decl_Id
);
4007 Set_Ekind
(Act_Decl_Id
, E_Package
);
4009 -- Initialize list of incomplete actuals before analysis
4011 Set_Incomplete_Actuals
(Act_Decl_Id
, New_Elmt_List
);
4013 Preanalyze_Actuals
(N
, Act_Decl_Id
);
4015 -- Turn off style checking in instances. If the check is enabled on the
4016 -- generic unit, a warning in an instance would just be noise. If not
4017 -- enabled on the generic, then a warning in an instance is just wrong.
4018 -- This must be done after analyzing the actuals, which do come from
4019 -- source and are subject to style checking.
4021 Style_Check
:= False;
4024 Env_Installed
:= True;
4026 -- Reset renaming map for formal types. The mapping is established
4027 -- when analyzing the generic associations, but some mappings are
4028 -- inherited from formal packages of parent units, and these are
4029 -- constructed when the parents are installed.
4031 Generic_Renamings
.Set_Last
(0);
4032 Generic_Renamings_HTable
.Reset
;
4034 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4035 Gen_Unit
:= Entity
(Gen_Id
);
4037 -- A package instantiation is Ghost when it is subject to pragma Ghost
4038 -- or the generic template is Ghost. Set the mode now to ensure that
4039 -- any nodes generated during analysis and expansion are marked as
4042 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
4044 -- Verify that it is the name of a generic package
4046 -- A visibility glitch: if the instance is a child unit and the generic
4047 -- is the generic unit of a parent instance (i.e. both the parent and
4048 -- the child units are instances of the same package) the name now
4049 -- denotes the renaming within the parent, not the intended generic
4050 -- unit. See if there is a homonym that is the desired generic. The
4051 -- renaming declaration must be visible inside the instance of the
4052 -- child, but not when analyzing the name in the instantiation itself.
4054 if Ekind
(Gen_Unit
) = E_Package
4055 and then Present
(Renamed_Entity
(Gen_Unit
))
4056 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
4057 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
4058 and then Present
(Homonym
(Gen_Unit
))
4060 Gen_Unit
:= Homonym
(Gen_Unit
);
4063 if Etype
(Gen_Unit
) = Any_Type
then
4067 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
4069 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
4071 if From_Limited_With
(Gen_Unit
) then
4073 ("cannot instantiate a limited withed package", Gen_Id
);
4076 ("& is not the name of a generic package", Gen_Id
, Gen_Unit
);
4083 if In_Extended_Main_Source_Unit
(N
) then
4084 Set_Is_Instantiated
(Gen_Unit
);
4085 Generate_Reference
(Gen_Unit
, N
);
4087 if Present
(Renamed_Object
(Gen_Unit
)) then
4088 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
4089 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
4093 if Nkind
(Gen_Id
) = N_Identifier
4094 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4097 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4099 elsif Nkind
(Gen_Id
) = N_Expanded_Name
4100 and then Is_Child_Unit
(Gen_Unit
)
4101 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
4102 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
4105 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
4108 Set_Entity
(Gen_Id
, Gen_Unit
);
4110 -- If generic is a renaming, get original generic unit
4112 if Present
(Renamed_Object
(Gen_Unit
))
4113 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
4115 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4118 -- Verify that there are no circular instantiations
4120 if In_Open_Scopes
(Gen_Unit
) then
4121 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4125 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4126 Error_Msg_Node_2
:= Current_Scope
;
4128 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4129 Circularity_Detected
:= True;
4134 Set_Ekind
(Inst_Id
, E_Package
);
4135 Set_Scope
(Inst_Id
, Current_Scope
);
4137 -- If the context of the instance is subject to SPARK_Mode "off" or
4138 -- the annotation is altogether missing, set the global flag which
4139 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
4142 if SPARK_Mode
/= On
then
4143 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
4145 -- Mark the instance spec in case the body is instantiated at a
4146 -- later pass. This preserves the original context in effect for
4149 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
4152 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4153 Gen_Spec
:= Specification
(Gen_Decl
);
4155 -- Initialize renamings map, for error checking, and the list that
4156 -- holds private entities whose views have changed between generic
4157 -- definition and instantiation. If this is the instance created to
4158 -- validate an actual package, the instantiation environment is that
4159 -- of the enclosing instance.
4161 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
4163 -- Copy original generic tree, to produce text for instantiation
4167 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4169 Act_Spec
:= Specification
(Act_Tree
);
4171 -- If this is the instance created to validate an actual package,
4172 -- only the formals matter, do not examine the package spec itself.
4174 if Is_Actual_Pack
then
4175 Set_Visible_Declarations
(Act_Spec
, New_List
);
4176 Set_Private_Declarations
(Act_Spec
, New_List
);
4180 Analyze_Associations
4182 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
4183 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
4185 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
4187 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
4188 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
4189 Set_Is_Generic_Instance
(Act_Decl_Id
);
4190 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4192 -- References to the generic in its own declaration or its body are
4193 -- references to the instance. Add a renaming declaration for the
4194 -- generic unit itself. This declaration, as well as the renaming
4195 -- declarations for the generic formals, must remain private to the
4196 -- unit: the formals, because this is the language semantics, and
4197 -- the unit because its use is an artifact of the implementation.
4200 Make_Package_Renaming_Declaration
(Loc
,
4201 Defining_Unit_Name
=>
4202 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
4203 Name
=> New_Occurrence_Of
(Act_Decl_Id
, Loc
));
4205 Append
(Unit_Renaming
, Renaming_List
);
4207 -- The renaming declarations are the first local declarations of the
4210 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
4212 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
4214 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
4217 Act_Decl
:= Make_Package_Declaration
(Loc
, Specification
=> Act_Spec
);
4219 -- Propagate the aspect specifications from the package declaration
4220 -- template to the instantiated version of the package declaration.
4222 if Has_Aspects
(Act_Tree
) then
4223 Set_Aspect_Specifications
(Act_Decl
,
4224 New_Copy_List_Tree
(Aspect_Specifications
(Act_Tree
)));
4227 -- The generic may have a generated Default_Storage_Pool aspect,
4228 -- set at the point of generic declaration. If the instance has
4229 -- that aspect, it overrides the one inherited from the generic.
4231 if Has_Aspects
(Gen_Spec
) then
4232 if No
(Aspect_Specifications
(N
)) then
4233 Set_Aspect_Specifications
(N
,
4235 (Aspect_Specifications
(Gen_Spec
))));
4239 Inherited_Aspects
: constant List_Id
:=
4241 (Aspect_Specifications
(Gen_Spec
));
4245 Pool_Present
: Boolean := False;
4248 ASN1
:= First
(Aspect_Specifications
(N
));
4249 while Present
(ASN1
) loop
4250 if Chars
(Identifier
(ASN1
)) =
4251 Name_Default_Storage_Pool
4253 Pool_Present
:= True;
4260 if Pool_Present
then
4262 -- If generic carries a default storage pool, remove it
4263 -- in favor of the instance one.
4265 ASN2
:= First
(Inherited_Aspects
);
4266 while Present
(ASN2
) loop
4267 if Chars
(Identifier
(ASN2
)) =
4268 Name_Default_Storage_Pool
4279 (Aspect_Specifications
(N
), Inherited_Aspects
);
4284 -- Save the instantiation node, for subsequent instantiation of the
4285 -- body, if there is one and we are generating code for the current
4286 -- unit. Mark unit as having a body (avoids premature error message).
4288 -- We instantiate the body if we are generating code, if we are
4289 -- generating cross-reference information, or if we are building
4290 -- trees for ASIS use or GNATprove use.
4293 Enclosing_Body_Present
: Boolean := False;
4294 -- If the generic unit is not a compilation unit, then a body may
4295 -- be present in its parent even if none is required. We create a
4296 -- tentative pending instantiation for the body, which will be
4297 -- discarded if none is actually present.
4302 if Scope
(Gen_Unit
) /= Standard_Standard
4303 and then not Is_Child_Unit
(Gen_Unit
)
4305 Scop
:= Scope
(Gen_Unit
);
4306 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
4307 if Unit_Requires_Body
(Scop
) then
4308 Enclosing_Body_Present
:= True;
4311 elsif In_Open_Scopes
(Scop
)
4312 and then In_Package_Body
(Scop
)
4314 Enclosing_Body_Present
:= True;
4318 exit when Is_Compilation_Unit
(Scop
);
4319 Scop
:= Scope
(Scop
);
4323 -- If front-end inlining is enabled or there are any subprograms
4324 -- marked with Inline_Always, and this is a unit for which code
4325 -- will be generated, we instantiate the body at once.
4327 -- This is done if the instance is not the main unit, and if the
4328 -- generic is not a child unit of another generic, to avoid scope
4329 -- problems and the reinstallation of parent instances.
4332 and then (not Is_Child_Unit
(Gen_Unit
)
4333 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
4334 and then Might_Inline_Subp
(Gen_Unit
)
4335 and then not Is_Actual_Pack
4337 if not Back_End_Inlining
4338 and then (Front_End_Inlining
or else Has_Inline_Always
)
4339 and then (Is_In_Main_Unit
(N
)
4340 or else In_Main_Context
(Current_Scope
))
4341 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4345 -- In configurable_run_time mode we force the inlining of
4346 -- predefined subprograms marked Inline_Always, to minimize
4347 -- the use of the run-time library.
4349 elsif In_Predefined_Unit
(Gen_Decl
)
4350 and then Configurable_Run_Time_Mode
4351 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
4356 -- If the current scope is itself an instance within a child
4357 -- unit, there will be duplications in the scope stack, and the
4358 -- unstacking mechanism in Inline_Instance_Body will fail.
4359 -- This loses some rare cases of optimization, and might be
4360 -- improved some day, if we can find a proper abstraction for
4361 -- "the complete compilation context" that can be saved and
4364 if Is_Generic_Instance
(Current_Scope
) then
4366 Curr_Unit
: constant Entity_Id
:=
4367 Cunit_Entity
(Current_Sem_Unit
);
4369 if Curr_Unit
/= Current_Scope
4370 and then Is_Child_Unit
(Curr_Unit
)
4372 Inline_Now
:= False;
4379 (Unit_Requires_Body
(Gen_Unit
)
4380 or else Enclosing_Body_Present
4381 or else Present
(Corresponding_Body
(Gen_Decl
)))
4382 and then (Is_In_Main_Unit
(N
)
4383 or else Might_Inline_Subp
(Gen_Unit
))
4384 and then not Is_Actual_Pack
4385 and then not Inline_Now
4386 and then (Operating_Mode
= Generate_Code
4388 -- Need comment for this check ???
4390 or else (Operating_Mode
= Check_Semantics
4391 and then (ASIS_Mode
or GNATprove_Mode
)));
4393 -- If front-end inlining is enabled or there are any subprograms
4394 -- marked with Inline_Always, do not instantiate body when within
4395 -- a generic context.
4397 if ((Front_End_Inlining
or else Has_Inline_Always
)
4398 and then not Expander_Active
)
4399 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
4401 Needs_Body
:= False;
4404 -- If the current context is generic, and the package being
4405 -- instantiated is declared within a formal package, there is no
4406 -- body to instantiate until the enclosing generic is instantiated
4407 -- and there is an actual for the formal package. If the formal
4408 -- package has parameters, we build a regular package instance for
4409 -- it, that precedes the original formal package declaration.
4411 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
4413 Decl
: constant Node_Id
:=
4415 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
4417 if Nkind
(Decl
) = N_Formal_Package_Declaration
4418 or else (Nkind
(Decl
) = N_Package_Declaration
4419 and then Is_List_Member
(Decl
)
4420 and then Present
(Next
(Decl
))
4422 Nkind
(Next
(Decl
)) =
4423 N_Formal_Package_Declaration
)
4425 Needs_Body
:= False;
4431 -- For RCI unit calling stubs, we omit the instance body if the
4432 -- instance is the RCI library unit itself.
4434 -- However there is a special case for nested instances: in this case
4435 -- we do generate the instance body, as it might be required, e.g.
4436 -- because it provides stream attributes for some type used in the
4437 -- profile of a remote subprogram. This is consistent with 12.3(12),
4438 -- which indicates that the instance body occurs at the place of the
4439 -- instantiation, and thus is part of the RCI declaration, which is
4440 -- present on all client partitions (this is E.2.3(18)).
4442 -- Note that AI12-0002 may make it illegal at some point to have
4443 -- stream attributes defined in an RCI unit, in which case this
4444 -- special case will become unnecessary. In the meantime, there
4445 -- is known application code in production that depends on this
4446 -- being possible, so we definitely cannot eliminate the body in
4447 -- the case of nested instances for the time being.
4449 -- When we generate a nested instance body, calling stubs for any
4450 -- relevant subprogram will be be inserted immediately after the
4451 -- subprogram declarations, and will take precedence over the
4452 -- subsequent (original) body. (The stub and original body will be
4453 -- complete homographs, but this is permitted in an instance).
4454 -- (Could we do better and remove the original body???)
4456 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
4457 and then Comes_From_Source
(N
)
4458 and then Nkind
(Parent
(N
)) = N_Compilation_Unit
4460 Needs_Body
:= False;
4465 -- Here is a defence against a ludicrous number of instantiations
4466 -- caused by a circular set of instantiation attempts.
4468 if Pending_Instantiations
.Last
> Maximum_Instantiations
then
4469 Error_Msg_Uint_1
:= UI_From_Int
(Maximum_Instantiations
);
4470 Error_Msg_N
("too many instantiations, exceeds max of^", N
);
4471 Error_Msg_N
("\limit can be changed using -gnateinn switch", N
);
4472 raise Unrecoverable_Error
;
4475 -- Indicate that the enclosing scopes contain an instantiation,
4476 -- and that cleanup actions should be delayed until after the
4477 -- instance body is expanded.
4479 Check_Forward_Instantiation
(Gen_Decl
);
4480 if Nkind
(N
) = N_Package_Instantiation
then
4482 Enclosing_Master
: Entity_Id
;
4485 -- Loop to search enclosing masters
4487 Enclosing_Master
:= Current_Scope
;
4488 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
4489 if Ekind
(Enclosing_Master
) = E_Package
then
4490 if Is_Compilation_Unit
(Enclosing_Master
) then
4491 if In_Package_Body
(Enclosing_Master
) then
4493 (Body_Entity
(Enclosing_Master
));
4502 Enclosing_Master
:= Scope
(Enclosing_Master
);
4505 elsif Is_Generic_Unit
(Enclosing_Master
)
4506 or else Ekind
(Enclosing_Master
) = E_Void
4508 -- Cleanup actions will eventually be performed on the
4509 -- enclosing subprogram or package instance, if any.
4510 -- Enclosing scope is void in the formal part of a
4511 -- generic subprogram.
4516 if Ekind
(Enclosing_Master
) = E_Entry
4518 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
4520 if not Expander_Active
then
4524 Protected_Body_Subprogram
(Enclosing_Master
);
4528 Set_Delay_Cleanups
(Enclosing_Master
);
4530 while Ekind
(Enclosing_Master
) = E_Block
loop
4531 Enclosing_Master
:= Scope
(Enclosing_Master
);
4534 if Is_Subprogram
(Enclosing_Master
) then
4535 Delay_Descriptors
(Enclosing_Master
);
4537 elsif Is_Task_Type
(Enclosing_Master
) then
4539 TBP
: constant Node_Id
:=
4540 Get_Task_Body_Procedure
4543 if Present
(TBP
) then
4544 Delay_Descriptors
(TBP
);
4545 Set_Delay_Cleanups
(TBP
);
4552 end loop Scope_Loop
;
4555 -- Make entry in table
4557 Add_Pending_Instantiation
(N
, Act_Decl
);
4561 Set_Categorization_From_Pragmas
(Act_Decl
);
4563 if Parent_Installed
then
4567 Set_Instance_Spec
(N
, Act_Decl
);
4569 -- If not a compilation unit, insert the package declaration before
4570 -- the original instantiation node.
4572 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4573 Mark_Rewrite_Insertion
(Act_Decl
);
4574 Insert_Before
(N
, Act_Decl
);
4576 if Has_Aspects
(N
) then
4577 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4579 -- The pragma created for a Default_Storage_Pool aspect must
4580 -- appear ahead of the declarations in the instance spec.
4581 -- Analysis has placed it after the instance node, so remove
4582 -- it and reinsert it properly now.
4585 ASN
: constant Node_Id
:= First
(Aspect_Specifications
(N
));
4586 A_Name
: constant Name_Id
:= Chars
(Identifier
(ASN
));
4590 if A_Name
= Name_Default_Storage_Pool
then
4591 if No
(Visible_Declarations
(Act_Spec
)) then
4592 Set_Visible_Declarations
(Act_Spec
, New_List
);
4596 while Present
(Decl
) loop
4597 if Nkind
(Decl
) = N_Pragma
then
4599 Prepend
(Decl
, Visible_Declarations
(Act_Spec
));
4611 -- For an instantiation that is a compilation unit, place
4612 -- declaration on current node so context is complete for analysis
4613 -- (including nested instantiations). If this is the main unit,
4614 -- the declaration eventually replaces the instantiation node.
4615 -- If the instance body is created later, it replaces the
4616 -- instance node, and the declaration is attached to it
4617 -- (see Build_Instance_Compilation_Unit_Nodes).
4620 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
4622 -- The entity for the current unit is the newly created one,
4623 -- and all semantic information is attached to it.
4625 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
4627 -- If this is the main unit, replace the main entity as well
4629 if Current_Sem_Unit
= Main_Unit
then
4630 Main_Unit_Entity
:= Act_Decl_Id
;
4634 Set_Unit
(Parent
(N
), Act_Decl
);
4635 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4636 Set_Package_Instantiation
(Act_Decl_Id
, N
);
4638 -- Process aspect specifications of the instance node, if any, to
4639 -- take into account categorization pragmas before analyzing the
4642 if Has_Aspects
(N
) then
4643 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4647 Set_Unit
(Parent
(N
), N
);
4648 Set_Body_Required
(Parent
(N
), False);
4650 -- We never need elaboration checks on instantiations, since by
4651 -- definition, the body instantiation is elaborated at the same
4652 -- time as the spec instantiation.
4654 if Legacy_Elaboration_Checks
then
4655 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4656 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4660 if Legacy_Elaboration_Checks
then
4661 Check_Elab_Instantiation
(N
);
4664 -- Save the scenario for later examination by the ABE Processing
4667 Record_Elaboration_Scenario
(N
);
4669 -- The instantiation results in a guaranteed ABE
4671 if Is_Known_Guaranteed_ABE
(N
) and then Needs_Body
then
4673 -- Do not instantiate the corresponding body because gigi cannot
4674 -- handle certain types of premature instantiations.
4676 Pending_Instantiations
.Decrement_Last
;
4678 -- Create completing bodies for all subprogram declarations since
4679 -- their real bodies will not be instantiated.
4681 Provide_Completing_Bodies
(Instance_Spec
(N
));
4684 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4686 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
4687 First_Private_Entity
(Act_Decl_Id
));
4689 -- If the instantiation will receive a body, the unit will be
4690 -- transformed into a package body, and receive its own elaboration
4691 -- entity. Otherwise, the nature of the unit is now a package
4694 if Nkind
(Parent
(N
)) = N_Compilation_Unit
4695 and then not Needs_Body
4697 Rewrite
(N
, Act_Decl
);
4700 if Present
(Corresponding_Body
(Gen_Decl
))
4701 or else Unit_Requires_Body
(Gen_Unit
)
4703 Set_Has_Completion
(Act_Decl_Id
);
4706 Check_Formal_Packages
(Act_Decl_Id
);
4708 Restore_Hidden_Primitives
(Vis_Prims_List
);
4709 Restore_Private_Views
(Act_Decl_Id
);
4711 Inherit_Context
(Gen_Decl
, N
);
4713 if Parent_Installed
then
4718 Env_Installed
:= False;
4721 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4723 -- There used to be a check here to prevent instantiations in local
4724 -- contexts if the No_Local_Allocators restriction was active. This
4725 -- check was removed by a binding interpretation in AI-95-00130/07,
4726 -- but we retain the code for documentation purposes.
4728 -- if Ekind (Act_Decl_Id) /= E_Void
4729 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
4731 -- Check_Restriction (No_Local_Allocators, N);
4735 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
4738 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
4739 -- be used as defining identifiers for a formal package and for the
4740 -- corresponding expanded package.
4742 if Nkind
(N
) = N_Formal_Package_Declaration
then
4743 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
4744 Set_Comes_From_Source
(Act_Decl_Id
, True);
4745 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
4746 Set_Defining_Identifier
(N
, Act_Decl_Id
);
4749 -- Check that if N is an instantiation of System.Dim_Float_IO or
4750 -- System.Dim_Integer_IO, the formal type has a dimension system.
4752 if Nkind
(N
) = N_Package_Instantiation
4753 and then Is_Dim_IO_Package_Instantiation
(N
)
4756 Assoc
: constant Node_Id
:= First
(Generic_Associations
(N
));
4758 if not Has_Dimension_System
4759 (Etype
(Explicit_Generic_Actual_Parameter
(Assoc
)))
4761 Error_Msg_N
("type with a dimension system expected", Assoc
);
4767 if Has_Aspects
(N
) and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
4768 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
4771 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4772 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
4773 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4774 Style_Check
:= Saved_Style_Check
;
4777 when Instantiation_Error
=>
4778 if Parent_Installed
then
4782 if Env_Installed
then
4786 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
4787 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
4788 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
4789 Style_Check
:= Saved_Style_Check
;
4790 end Analyze_Package_Instantiation
;
4792 --------------------------
4793 -- Inline_Instance_Body --
4794 --------------------------
4796 -- WARNING: This routine manages SPARK regions. Return statements must be
4797 -- replaced by gotos which jump to the end of the routine and restore the
4800 procedure Inline_Instance_Body
4802 Gen_Unit
: Entity_Id
;
4805 Config_Attrs
: constant Config_Switches_Type
:= Save_Config_Switches
;
4807 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
4808 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
4809 Gen_Comp
: constant Entity_Id
:=
4810 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
4812 Scope_Stack_Depth
: constant Pos
:=
4813 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
4815 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4816 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
4817 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
4819 Curr_Scope
: Entity_Id
:= Empty
;
4820 List
: Elist_Id
:= No_Elist
; -- init to avoid warning
4821 N_Instances
: Nat
:= 0;
4822 Num_Inner
: Nat
:= 0;
4823 Num_Scopes
: Nat
:= 0;
4824 Removed
: Boolean := False;
4829 -- Case of generic unit defined in another unit. We must remove the
4830 -- complete context of the current unit to install that of the generic.
4832 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
4834 -- Add some comments for the following two loops ???
4837 while Present
(S
) and then S
/= Standard_Standard
loop
4839 Num_Scopes
:= Num_Scopes
+ 1;
4841 Use_Clauses
(Num_Scopes
) :=
4843 (Scope_Stack
.Last
- Num_Scopes
+ 1).
4845 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
4847 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
4848 or else Scope_Stack
.Table
4849 (Scope_Stack
.Last
- Num_Scopes
).Entity
= Scope
(S
);
4852 exit when Is_Generic_Instance
(S
)
4853 and then (In_Package_Body
(S
)
4854 or else Ekind
(S
) = E_Procedure
4855 or else Ekind
(S
) = E_Function
);
4859 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
4861 -- Find and save all enclosing instances
4866 and then S
/= Standard_Standard
4868 if Is_Generic_Instance
(S
) then
4869 N_Instances
:= N_Instances
+ 1;
4870 Instances
(N_Instances
) := S
;
4872 exit when In_Package_Body
(S
);
4878 -- Remove context of current compilation unit, unless we are within a
4879 -- nested package instantiation, in which case the context has been
4880 -- removed previously.
4882 -- If current scope is the body of a child unit, remove context of
4883 -- spec as well. If an enclosing scope is an instance body, the
4884 -- context has already been removed, but the entities in the body
4885 -- must be made invisible as well.
4888 while Present
(S
) and then S
/= Standard_Standard
loop
4889 if Is_Generic_Instance
(S
)
4890 and then (In_Package_Body
(S
)
4891 or else Ekind_In
(S
, E_Procedure
, E_Function
))
4893 -- We still have to remove the entities of the enclosing
4894 -- instance from direct visibility.
4899 E
:= First_Entity
(S
);
4900 while Present
(E
) loop
4901 Set_Is_Immediately_Visible
(E
, False);
4910 or else (Ekind
(Curr_Unit
) = E_Package_Body
4911 and then S
= Spec_Entity
(Curr_Unit
))
4912 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
4913 and then S
= Corresponding_Spec
4914 (Unit_Declaration_Node
(Curr_Unit
)))
4918 -- Remove entities in current scopes from visibility, so that
4919 -- instance body is compiled in a clean environment.
4921 List
:= Save_Scope_Stack
(Handle_Use
=> False);
4923 if Is_Child_Unit
(S
) then
4925 -- Remove child unit from stack, as well as inner scopes.
4926 -- Removing the context of a child unit removes parent units
4929 while Current_Scope
/= S
loop
4930 Num_Inner
:= Num_Inner
+ 1;
4931 Inner_Scopes
(Num_Inner
) := Current_Scope
;
4936 Remove_Context
(Curr_Comp
);
4940 Remove_Context
(Curr_Comp
);
4943 if Ekind
(Curr_Unit
) = E_Package_Body
then
4944 Remove_Context
(Library_Unit
(Curr_Comp
));
4951 pragma Assert
(Num_Inner
< Num_Scopes
);
4953 Push_Scope
(Standard_Standard
);
4954 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
4956 -- The inlined package body is analyzed with the configuration state
4957 -- of the context prior to the scope manipulations performed above.
4959 -- ??? shouldn't this also use the warning state of the context prior
4960 -- to the scope manipulations?
4962 Instantiate_Package_Body
4964 ((Act_Decl
=> Act_Decl
,
4965 Config_Switches
=> Config_Attrs
,
4966 Current_Sem_Unit
=> Current_Sem_Unit
,
4967 Expander_Status
=> Expander_Active
,
4969 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
4970 Scope_Suppress
=> Scope_Suppress
,
4971 Warnings
=> Save_Warnings
)),
4972 Inlined_Body
=> True);
4978 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
4980 -- Reset Generic_Instance flag so that use clauses can be installed
4981 -- in the proper order. (See Use_One_Package for effect of enclosing
4982 -- instances on processing of use clauses).
4984 for J
in 1 .. N_Instances
loop
4985 Set_Is_Generic_Instance
(Instances
(J
), False);
4989 Install_Context
(Curr_Comp
, Chain
=> False);
4991 if Present
(Curr_Scope
)
4992 and then Is_Child_Unit
(Curr_Scope
)
4994 Push_Scope
(Curr_Scope
);
4995 Set_Is_Immediately_Visible
(Curr_Scope
);
4997 -- Finally, restore inner scopes as well
4999 for J
in reverse 1 .. Num_Inner
loop
5000 Push_Scope
(Inner_Scopes
(J
));
5004 Restore_Scope_Stack
(List
, Handle_Use
=> False);
5006 if Present
(Curr_Scope
)
5008 (In_Private_Part
(Curr_Scope
)
5009 or else In_Package_Body
(Curr_Scope
))
5011 -- Install private declaration of ancestor units, which are
5012 -- currently available. Restore_Scope_Stack and Install_Context
5013 -- only install the visible part of parents.
5018 Par
:= Scope
(Curr_Scope
);
5019 while (Present
(Par
)) and then Par
/= Standard_Standard
loop
5020 Install_Private_Declarations
(Par
);
5027 -- Restore use clauses. For a child unit, use clauses in the parents
5028 -- are restored when installing the context, so only those in inner
5029 -- scopes (and those local to the child unit itself) need to be
5030 -- installed explicitly.
5032 if Is_Child_Unit
(Curr_Unit
) and then Removed
then
5033 for J
in reverse 1 .. Num_Inner
+ 1 loop
5034 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5036 Install_Use_Clauses
(Use_Clauses
(J
));
5040 for J
in reverse 1 .. Num_Scopes
loop
5041 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
5043 Install_Use_Clauses
(Use_Clauses
(J
));
5047 -- Restore status of instances. If one of them is a body, make its
5048 -- local entities visible again.
5055 for J
in 1 .. N_Instances
loop
5056 Inst
:= Instances
(J
);
5057 Set_Is_Generic_Instance
(Inst
, True);
5059 if In_Package_Body
(Inst
)
5060 or else Ekind_In
(S
, E_Procedure
, E_Function
)
5062 E
:= First_Entity
(Instances
(J
));
5063 while Present
(E
) loop
5064 Set_Is_Immediately_Visible
(E
);
5071 -- If generic unit is in current unit, current context is correct. Note
5072 -- that the context is guaranteed to carry the correct SPARK_Mode as no
5073 -- enclosing scopes were removed.
5076 Instantiate_Package_Body
5078 ((Act_Decl
=> Act_Decl
,
5079 Config_Switches
=> Save_Config_Switches
,
5080 Current_Sem_Unit
=> Current_Sem_Unit
,
5081 Expander_Status
=> Expander_Active
,
5083 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
5084 Scope_Suppress
=> Scope_Suppress
,
5085 Warnings
=> Save_Warnings
)),
5086 Inlined_Body
=> True);
5088 end Inline_Instance_Body
;
5090 -------------------------------------
5091 -- Analyze_Procedure_Instantiation --
5092 -------------------------------------
5094 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
5096 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
5097 end Analyze_Procedure_Instantiation
;
5099 -----------------------------------
5100 -- Need_Subprogram_Instance_Body --
5101 -----------------------------------
5103 function Need_Subprogram_Instance_Body
5105 Subp
: Entity_Id
) return Boolean
5107 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean;
5108 -- Return True if E is an inlined subprogram, an inlined renaming or a
5109 -- subprogram nested in an inlined subprogram. The inlining machinery
5110 -- totally disregards nested subprograms since it considers that they
5111 -- will always be compiled if the parent is (see Inline.Is_Nested).
5113 ------------------------------------
5114 -- Is_Inlined_Or_Child_Of_Inlined --
5115 ------------------------------------
5117 function Is_Inlined_Or_Child_Of_Inlined
(E
: Entity_Id
) return Boolean is
5121 if Is_Inlined
(E
) or else Is_Inlined
(Alias
(E
)) then
5126 while Scop
/= Standard_Standard
loop
5127 if Ekind
(Scop
) in Subprogram_Kind
and then Is_Inlined
(Scop
) then
5131 Scop
:= Scope
(Scop
);
5135 end Is_Inlined_Or_Child_Of_Inlined
;
5138 -- Must be in the main unit or inlined (or child of inlined)
5140 if (Is_In_Main_Unit
(N
) or else Is_Inlined_Or_Child_Of_Inlined
(Subp
))
5142 -- Must be generating code or analyzing code in ASIS/GNATprove mode
5144 and then (Operating_Mode
= Generate_Code
5145 or else (Operating_Mode
= Check_Semantics
5146 and then (ASIS_Mode
or GNATprove_Mode
)))
5148 -- The body is needed when generating code (full expansion), in ASIS
5149 -- mode for other tools, and in GNATprove mode (special expansion) for
5150 -- formal verification of the body itself.
5152 and then (Expander_Active
or ASIS_Mode
or GNATprove_Mode
)
5154 -- No point in inlining if ABE is inevitable
5156 and then not Is_Known_Guaranteed_ABE
(N
)
5158 -- Or if subprogram is eliminated
5160 and then not Is_Eliminated
(Subp
)
5162 Add_Pending_Instantiation
(N
, Unit_Declaration_Node
(Subp
));
5165 -- Here if not inlined, or we ignore the inlining
5170 end Need_Subprogram_Instance_Body
;
5172 --------------------------------------
5173 -- Analyze_Subprogram_Instantiation --
5174 --------------------------------------
5176 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
5177 -- must be replaced by gotos which jump to the end of the routine in order
5178 -- to restore the Ghost and SPARK modes.
5180 procedure Analyze_Subprogram_Instantiation
5184 Errs
: constant Nat
:= Serious_Errors_Detected
;
5185 Gen_Id
: constant Node_Id
:= Name
(N
);
5186 Inst_Id
: constant Entity_Id
:= Defining_Entity
(N
);
5187 Anon_Id
: constant Entity_Id
:=
5188 Make_Defining_Identifier
(Sloc
(Inst_Id
),
5189 Chars
=> New_External_Name
(Chars
(Inst_Id
), 'R'));
5190 Loc
: constant Source_Ptr
:= Sloc
(N
);
5192 Act_Decl_Id
: Entity_Id
:= Empty
; -- init to avoid warning
5197 Env_Installed
: Boolean := False;
5198 Gen_Unit
: Entity_Id
;
5200 Pack_Id
: Entity_Id
;
5201 Parent_Installed
: Boolean := False;
5203 Renaming_List
: List_Id
;
5204 -- The list of declarations that link formals and actuals of the
5205 -- instance. These are subtype declarations for formal types, and
5206 -- renaming declarations for other formals. The subprogram declaration
5207 -- for the instance is then appended to the list, and the last item on
5208 -- the list is the renaming declaration for the instance.
5210 procedure Analyze_Instance_And_Renamings
;
5211 -- The instance must be analyzed in a context that includes the mappings
5212 -- of generic parameters into actuals. We create a package declaration
5213 -- for this purpose, and a subprogram with an internal name within the
5214 -- package. The subprogram instance is simply an alias for the internal
5215 -- subprogram, declared in the current scope.
5217 procedure Build_Subprogram_Renaming
;
5218 -- If the subprogram is recursive, there are occurrences of the name of
5219 -- the generic within the body, which must resolve to the current
5220 -- instance. We add a renaming declaration after the declaration, which
5221 -- is available in the instance body, as well as in the analysis of
5222 -- aspects that appear in the generic. This renaming declaration is
5223 -- inserted after the instance declaration which it renames.
5225 ------------------------------------
5226 -- Analyze_Instance_And_Renamings --
5227 ------------------------------------
5229 procedure Analyze_Instance_And_Renamings
is
5230 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
5231 Pack_Decl
: Node_Id
;
5234 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5236 -- For the case of a compilation unit, the container package has
5237 -- the same name as the instantiation, to insure that the binder
5238 -- calls the elaboration procedure with the right name. Copy the
5239 -- entity of the instance, which may have compilation level flags
5240 -- (e.g. Is_Child_Unit) set.
5242 Pack_Id
:= New_Copy
(Def_Ent
);
5245 -- Otherwise we use the name of the instantiation concatenated
5246 -- with its source position to ensure uniqueness if there are
5247 -- several instantiations with the same name.
5250 Make_Defining_Identifier
(Loc
,
5251 Chars
=> New_External_Name
5252 (Related_Id
=> Chars
(Def_Ent
),
5254 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
5258 Make_Package_Declaration
(Loc
,
5259 Specification
=> Make_Package_Specification
(Loc
,
5260 Defining_Unit_Name
=> Pack_Id
,
5261 Visible_Declarations
=> Renaming_List
,
5262 End_Label
=> Empty
));
5264 Set_Instance_Spec
(N
, Pack_Decl
);
5265 Set_Is_Generic_Instance
(Pack_Id
);
5266 Set_Debug_Info_Needed
(Pack_Id
);
5268 -- Case of not a compilation unit
5270 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
5271 Mark_Rewrite_Insertion
(Pack_Decl
);
5272 Insert_Before
(N
, Pack_Decl
);
5273 Set_Has_Completion
(Pack_Id
);
5275 -- Case of an instantiation that is a compilation unit
5277 -- Place declaration on current node so context is complete for
5278 -- analysis (including nested instantiations), and for use in a
5279 -- context_clause (see Analyze_With_Clause).
5282 Set_Unit
(Parent
(N
), Pack_Decl
);
5283 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
5286 Analyze
(Pack_Decl
);
5287 Check_Formal_Packages
(Pack_Id
);
5288 Set_Is_Generic_Instance
(Pack_Id
, False);
5290 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
5293 -- Body of the enclosing package is supplied when instantiating the
5294 -- subprogram body, after semantic analysis is completed.
5296 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5298 -- Remove package itself from visibility, so it does not
5299 -- conflict with subprogram.
5301 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
5303 -- Set name and scope of internal subprogram so that the proper
5304 -- external name will be generated. The proper scope is the scope
5305 -- of the wrapper package. We need to generate debugging info for
5306 -- the internal subprogram, so set flag accordingly.
5308 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
5309 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
5311 -- Mark wrapper package as referenced, to avoid spurious warnings
5312 -- if the instantiation appears in various with_ clauses of
5313 -- subunits of the main unit.
5315 Set_Referenced
(Pack_Id
);
5318 Set_Is_Generic_Instance
(Anon_Id
);
5319 Set_Debug_Info_Needed
(Anon_Id
);
5320 Act_Decl_Id
:= New_Copy
(Anon_Id
);
5322 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
5323 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
5324 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
5326 -- Subprogram instance comes from source only if generic does
5328 Set_Comes_From_Source
(Act_Decl_Id
, Comes_From_Source
(Gen_Unit
));
5330 -- If the instance is a child unit, mark the Id accordingly. Mark
5331 -- the anonymous entity as well, which is the real subprogram and
5332 -- which is used when the instance appears in a context clause.
5333 -- Similarly, propagate the Is_Eliminated flag to handle properly
5334 -- nested eliminated subprograms.
5336 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5337 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
5338 New_Overloaded_Entity
(Act_Decl_Id
);
5339 Check_Eliminated
(Act_Decl_Id
);
5340 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
5342 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5344 -- In compilation unit case, kill elaboration checks on the
5345 -- instantiation, since they are never needed - the body is
5346 -- instantiated at the same point as the spec.
5348 if Legacy_Elaboration_Checks
then
5349 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
5350 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
5353 Set_Is_Compilation_Unit
(Anon_Id
);
5354 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
5357 -- The instance is not a freezing point for the new subprogram.
5358 -- The anonymous subprogram may have a freeze node, created for
5359 -- some delayed aspects. This freeze node must not be inherited
5360 -- by the visible subprogram entity.
5362 Set_Is_Frozen
(Act_Decl_Id
, False);
5363 Set_Freeze_Node
(Act_Decl_Id
, Empty
);
5365 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
5366 Valid_Operator_Definition
(Act_Decl_Id
);
5369 Set_Alias
(Act_Decl_Id
, Anon_Id
);
5370 Set_Has_Completion
(Act_Decl_Id
);
5371 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
5373 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5374 Set_Body_Required
(Parent
(N
), False);
5376 end Analyze_Instance_And_Renamings
;
5378 -------------------------------
5379 -- Build_Subprogram_Renaming --
5380 -------------------------------
5382 procedure Build_Subprogram_Renaming
is
5383 Renaming_Decl
: Node_Id
;
5384 Unit_Renaming
: Node_Id
;
5388 Make_Subprogram_Renaming_Declaration
(Loc
,
5391 (Specification
(Original_Node
(Gen_Decl
)),
5393 Instantiating
=> True),
5394 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
5396 -- The generic may be a a child unit. The renaming needs an
5397 -- identifier with the proper name.
5399 Set_Defining_Unit_Name
(Specification
(Unit_Renaming
),
5400 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)));
5402 -- If there is a formal subprogram with the same name as the unit
5403 -- itself, do not add this renaming declaration, to prevent
5404 -- ambiguities when there is a call with that name in the body.
5405 -- This is a partial and ugly fix for one ACATS test. ???
5407 Renaming_Decl
:= First
(Renaming_List
);
5408 while Present
(Renaming_Decl
) loop
5409 if Nkind
(Renaming_Decl
) = N_Subprogram_Renaming_Declaration
5411 Chars
(Defining_Entity
(Renaming_Decl
)) = Chars
(Gen_Unit
)
5416 Next
(Renaming_Decl
);
5419 if No
(Renaming_Decl
) then
5420 Append
(Unit_Renaming
, Renaming_List
);
5422 end Build_Subprogram_Renaming
;
5426 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5427 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
5428 Saved_ISMP
: constant Boolean :=
5429 Ignore_SPARK_Mode_Pragmas_In_Instance
;
5430 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
5431 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
5432 -- Save the Ghost and SPARK mode-related data to restore on exit
5434 Vis_Prims_List
: Elist_Id
:= No_Elist
;
5435 -- List of primitives made temporarily visible in the instantiation
5436 -- to match the visibility of the formal type
5438 -- Start of processing for Analyze_Subprogram_Instantiation
5441 -- Preserve relevant elaboration-related attributes of the context which
5442 -- are no longer available or very expensive to recompute once analysis,
5443 -- resolution, and expansion are over.
5445 Mark_Elaboration_Attributes
5452 Check_SPARK_05_Restriction
("generic is not allowed", N
);
5454 -- Very first thing: check for special Text_IO unit in case we are
5455 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course
5456 -- such an instantiation is bogus (these are packages, not subprograms),
5457 -- but we get a better error message if we do this.
5459 Check_Text_IO_Special_Unit
(Gen_Id
);
5461 -- Make node global for error reporting
5463 Instantiation_Node
:= N
;
5465 -- For package instantiations we turn off style checks, because they
5466 -- will have been emitted in the generic. For subprogram instantiations
5467 -- we want to apply at least the check on overriding indicators so we
5468 -- do not modify the style check status.
5470 -- The renaming declarations for the actuals do not come from source and
5471 -- will not generate spurious warnings.
5473 Preanalyze_Actuals
(N
);
5476 Env_Installed
:= True;
5477 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
5478 Gen_Unit
:= Entity
(Gen_Id
);
5480 -- A subprogram instantiation is Ghost when it is subject to pragma
5481 -- Ghost or the generic template is Ghost. Set the mode now to ensure
5482 -- that any nodes generated during analysis and expansion are marked as
5485 Mark_And_Set_Ghost_Instantiation
(N
, Gen_Unit
);
5487 Generate_Reference
(Gen_Unit
, Gen_Id
);
5489 if Nkind
(Gen_Id
) = N_Identifier
5490 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
5493 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
5496 if Etype
(Gen_Unit
) = Any_Type
then
5501 -- Verify that it is a generic subprogram of the right kind, and that
5502 -- it does not lead to a circular instantiation.
5504 if K
= E_Procedure
and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
then
5506 ("& is not the name of a generic procedure", Gen_Id
, Gen_Unit
);
5508 elsif K
= E_Function
and then Ekind
(Gen_Unit
) /= E_Generic_Function
then
5510 ("& is not the name of a generic function", Gen_Id
, Gen_Unit
);
5512 elsif In_Open_Scopes
(Gen_Unit
) then
5513 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
5516 Set_Ekind
(Inst_Id
, K
);
5517 Set_Scope
(Inst_Id
, Current_Scope
);
5519 Set_Entity
(Gen_Id
, Gen_Unit
);
5520 Set_Is_Instantiated
(Gen_Unit
);
5522 if In_Extended_Main_Source_Unit
(N
) then
5523 Generate_Reference
(Gen_Unit
, N
);
5526 -- If renaming, get original unit
5528 if Present
(Renamed_Object
(Gen_Unit
))
5529 and then Ekind_In
(Renamed_Object
(Gen_Unit
), E_Generic_Procedure
,
5532 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
5533 Set_Is_Instantiated
(Gen_Unit
);
5534 Generate_Reference
(Gen_Unit
, N
);
5537 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
5538 Error_Msg_Node_2
:= Current_Scope
;
5540 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
5541 Circularity_Detected
:= True;
5542 Restore_Hidden_Primitives
(Vis_Prims_List
);
5546 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
5548 -- Initialize renamings map, for error checking
5550 Generic_Renamings
.Set_Last
(0);
5551 Generic_Renamings_HTable
.Reset
;
5553 Create_Instantiation_Source
(N
, Gen_Unit
, S_Adjustment
);
5555 -- Copy original generic tree, to produce text for instantiation
5559 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
5561 -- Inherit overriding indicator from instance node
5563 Act_Spec
:= Specification
(Act_Tree
);
5564 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
5565 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
5568 Analyze_Associations
5570 Formals
=> Generic_Formal_Declarations
(Act_Tree
),
5571 F_Copy
=> Generic_Formal_Declarations
(Gen_Decl
));
5573 Vis_Prims_List
:= Check_Hidden_Primitives
(Renaming_List
);
5575 -- The subprogram itself cannot contain a nested instance, so the
5576 -- current parent is left empty.
5578 Set_Instance_Env
(Gen_Unit
, Empty
);
5580 -- Build the subprogram declaration, which does not appear in the
5581 -- generic template, and give it a sloc consistent with that of the
5584 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
5585 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
5587 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
5588 Specification
=> Act_Spec
);
5590 -- The aspects have been copied previously, but they have to be
5591 -- linked explicitly to the new subprogram declaration. Explicit
5592 -- pre/postconditions on the instance are analyzed below, in a
5595 Move_Aspects
(Act_Tree
, To
=> Act_Decl
);
5596 Set_Categorization_From_Pragmas
(Act_Decl
);
5598 if Parent_Installed
then
5602 Append
(Act_Decl
, Renaming_List
);
5604 -- Contract-related source pragmas that follow a generic subprogram
5605 -- must be instantiated explicitly because they are not part of the
5606 -- subprogram template.
5608 Instantiate_Subprogram_Contract
5609 (Original_Node
(Gen_Decl
), Renaming_List
);
5611 Build_Subprogram_Renaming
;
5613 -- If the context of the instance is subject to SPARK_Mode "off" or
5614 -- the annotation is altogether missing, set the global flag which
5615 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within
5616 -- the instance. This should be done prior to analyzing the instance.
5618 if SPARK_Mode
/= On
then
5619 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
5622 -- If the context of an instance is not subject to SPARK_Mode "off",
5623 -- and the generic spec is subject to an explicit SPARK_Mode pragma,
5624 -- the latter should be the one applicable to the instance.
5626 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5627 and then Saved_SM
/= Off
5628 and then Present
(SPARK_Pragma
(Gen_Unit
))
5630 Set_SPARK_Mode
(Gen_Unit
);
5633 Analyze_Instance_And_Renamings
;
5635 -- Restore SPARK_Mode from the context after analysis of the package
5636 -- declaration, so that the SPARK_Mode on the generic spec does not
5637 -- apply to the pending instance for the instance body.
5639 if not Ignore_SPARK_Mode_Pragmas_In_Instance
5640 and then Saved_SM
/= Off
5641 and then Present
(SPARK_Pragma
(Gen_Unit
))
5643 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5646 -- If the generic is marked Import (Intrinsic), then so is the
5647 -- instance. This indicates that there is no body to instantiate. If
5648 -- generic is marked inline, so it the instance, and the anonymous
5649 -- subprogram it renames. If inlined, or else if inlining is enabled
5650 -- for the compilation, we generate the instance body even if it is
5651 -- not within the main unit.
5653 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
5654 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
5655 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
5657 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
5658 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
5662 -- Inherit convention from generic unit. Intrinsic convention, as for
5663 -- an instance of unchecked conversion, is not inherited because an
5664 -- explicit Ada instance has been created.
5666 if Has_Convention_Pragma
(Gen_Unit
)
5667 and then Convention
(Gen_Unit
) /= Convention_Intrinsic
5669 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
5670 Set_Is_Exported
(Act_Decl_Id
, Is_Exported
(Gen_Unit
));
5673 Generate_Definition
(Act_Decl_Id
);
5675 -- Inherit all inlining-related flags which apply to the generic in
5676 -- the subprogram and its declaration.
5678 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
5679 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
5681 Set_Has_Pragma_Inline
(Act_Decl_Id
, Has_Pragma_Inline
(Gen_Unit
));
5682 Set_Has_Pragma_Inline
(Anon_Id
, Has_Pragma_Inline
(Gen_Unit
));
5684 Set_Has_Pragma_Inline_Always
5685 (Act_Decl_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5686 Set_Has_Pragma_Inline_Always
5687 (Anon_Id
, Has_Pragma_Inline_Always
(Gen_Unit
));
5689 Set_Has_Pragma_No_Inline
5690 (Act_Decl_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5691 Set_Has_Pragma_No_Inline
5692 (Anon_Id
, Has_Pragma_No_Inline
(Gen_Unit
));
5694 -- Propagate No_Return if pragma applied to generic unit. This must
5695 -- be done explicitly because pragma does not appear in generic
5696 -- declaration (unlike the aspect case).
5698 if No_Return
(Gen_Unit
) then
5699 Set_No_Return
(Act_Decl_Id
);
5700 Set_No_Return
(Anon_Id
);
5703 -- Mark both the instance spec and the anonymous package in case the
5704 -- body is instantiated at a later pass. This preserves the original
5705 -- context in effect for the body.
5707 if SPARK_Mode
/= On
then
5708 Set_Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
);
5709 Set_Ignore_SPARK_Mode_Pragmas
(Anon_Id
);
5712 if Legacy_Elaboration_Checks
5713 and then not Is_Intrinsic_Subprogram
(Gen_Unit
)
5715 Check_Elab_Instantiation
(N
);
5718 -- Save the scenario for later examination by the ABE Processing
5721 Record_Elaboration_Scenario
(N
);
5723 -- The instantiation results in a guaranteed ABE. Create a completing
5724 -- body for the subprogram declaration because the real body will not
5727 if Is_Known_Guaranteed_ABE
(N
) then
5728 Provide_Completing_Bodies
(Instance_Spec
(N
));
5731 if Is_Dispatching_Operation
(Act_Decl_Id
)
5732 and then Ada_Version
>= Ada_2005
5738 Formal
:= First_Formal
(Act_Decl_Id
);
5739 while Present
(Formal
) loop
5740 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
5741 and then Is_Controlling_Formal
(Formal
)
5742 and then not Can_Never_Be_Null
(Formal
)
5745 ("access parameter& is controlling,", N
, Formal
);
5747 ("\corresponding parameter of & must be explicitly "
5748 & "null-excluding", N
, Gen_Id
);
5751 Next_Formal
(Formal
);
5756 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
5758 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
5760 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
5761 Inherit_Context
(Gen_Decl
, N
);
5763 Restore_Private_Views
(Pack_Id
, False);
5765 -- If the context requires a full instantiation, mark node for
5766 -- subsequent construction of the body.
5768 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
5769 Check_Forward_Instantiation
(Gen_Decl
);
5771 -- The wrapper package is always delayed, because it does not
5772 -- constitute a freeze point, but to insure that the freeze node
5773 -- is placed properly, it is created directly when instantiating
5774 -- the body (otherwise the freeze node might appear to early for
5775 -- nested instantiations). For ASIS purposes, indicate that the
5776 -- wrapper package has replaced the instantiation node.
5778 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5779 Rewrite
(N
, Unit
(Parent
(N
)));
5780 Set_Unit
(Parent
(N
), N
);
5783 -- Replace instance node for library-level instantiations of
5784 -- intrinsic subprograms, for ASIS use.
5786 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
5787 Rewrite
(N
, Unit
(Parent
(N
)));
5788 Set_Unit
(Parent
(N
), N
);
5791 if Parent_Installed
then
5795 Restore_Hidden_Primitives
(Vis_Prims_List
);
5797 Env_Installed
:= False;
5798 Generic_Renamings
.Set_Last
(0);
5799 Generic_Renamings_HTable
.Reset
;
5803 -- Analyze aspects in declaration if no errors appear in the instance.
5805 if Has_Aspects
(N
) and then Serious_Errors_Detected
= Errs
then
5806 Analyze_Aspect_Specifications
(N
, Act_Decl_Id
);
5809 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5810 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5811 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5814 when Instantiation_Error
=>
5815 if Parent_Installed
then
5819 if Env_Installed
then
5823 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
5824 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
5825 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
5826 end Analyze_Subprogram_Instantiation
;
5828 -------------------------
5829 -- Get_Associated_Node --
5830 -------------------------
5832 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
5836 Assoc
:= Associated_Node
(N
);
5838 if Nkind
(Assoc
) /= Nkind
(N
) then
5841 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
5845 -- If the node is part of an inner generic, it may itself have been
5846 -- remapped into a further generic copy. Associated_Node is otherwise
5847 -- used for the entity of the node, and will be of a different node
5848 -- kind, or else N has been rewritten as a literal or function call.
5850 while Present
(Associated_Node
(Assoc
))
5851 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
5853 Assoc
:= Associated_Node
(Assoc
);
5856 -- Follow an additional link in case the final node was rewritten.
5857 -- This can only happen with nested generic units.
5859 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
5860 and then Present
(Associated_Node
(Assoc
))
5861 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
5862 N_Explicit_Dereference
,
5867 Assoc
:= Associated_Node
(Assoc
);
5870 -- An additional special case: an unconstrained type in an object
5871 -- declaration may have been rewritten as a local subtype constrained
5872 -- by the expression in the declaration. We need to recover the
5873 -- original entity, which may be global.
5875 if Present
(Original_Node
(Assoc
))
5876 and then Nkind
(Parent
(N
)) = N_Object_Declaration
5878 Assoc
:= Original_Node
(Assoc
);
5883 end Get_Associated_Node
;
5885 ----------------------------
5886 -- Build_Function_Wrapper --
5887 ----------------------------
5889 function Build_Function_Wrapper
5890 (Formal_Subp
: Entity_Id
;
5891 Actual_Subp
: Entity_Id
) return Node_Id
5893 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
5894 Ret_Type
: constant Entity_Id
:= Get_Instance_Of
(Etype
(Formal_Subp
));
5897 Func_Name
: Node_Id
;
5899 Parm_Type
: Node_Id
;
5900 Profile
: List_Id
:= New_List
;
5907 Func_Name
:= New_Occurrence_Of
(Actual_Subp
, Loc
);
5909 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
5910 Set_Ekind
(Func
, E_Function
);
5911 Set_Is_Generic_Actual_Subprogram
(Func
);
5913 Actuals
:= New_List
;
5914 Profile
:= New_List
;
5916 Act_F
:= First_Formal
(Actual_Subp
);
5917 Form_F
:= First_Formal
(Formal_Subp
);
5918 while Present
(Form_F
) loop
5920 -- Create new formal for profile of wrapper, and add a reference
5921 -- to it in the list of actuals for the enclosing call. The name
5922 -- must be that of the formal in the formal subprogram, because
5923 -- calls to it in the generic body may use named associations.
5925 New_F
:= Make_Defining_Identifier
(Loc
, Chars
(Form_F
));
5928 New_Occurrence_Of
(Get_Instance_Of
(Etype
(Form_F
)), Loc
);
5931 Make_Parameter_Specification
(Loc
,
5932 Defining_Identifier
=> New_F
,
5933 Parameter_Type
=> Parm_Type
));
5935 Append_To
(Actuals
, New_Occurrence_Of
(New_F
, Loc
));
5936 Next_Formal
(Form_F
);
5938 if Present
(Act_F
) then
5939 Next_Formal
(Act_F
);
5944 Make_Function_Specification
(Loc
,
5945 Defining_Unit_Name
=> Func
,
5946 Parameter_Specifications
=> Profile
,
5947 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
5950 Make_Expression_Function
(Loc
,
5951 Specification
=> Spec
,
5953 Make_Function_Call
(Loc
,
5955 Parameter_Associations
=> Actuals
));
5958 end Build_Function_Wrapper
;
5960 ----------------------------
5961 -- Build_Operator_Wrapper --
5962 ----------------------------
5964 function Build_Operator_Wrapper
5965 (Formal_Subp
: Entity_Id
;
5966 Actual_Subp
: Entity_Id
) return Node_Id
5968 Loc
: constant Source_Ptr
:= Sloc
(Current_Scope
);
5969 Ret_Type
: constant Entity_Id
:=
5970 Get_Instance_Of
(Etype
(Formal_Subp
));
5971 Op_Type
: constant Entity_Id
:=
5972 Get_Instance_Of
(Etype
(First_Formal
(Formal_Subp
)));
5973 Is_Binary
: constant Boolean :=
5974 Present
(Next_Formal
(First_Formal
(Formal_Subp
)));
5977 Expr
: Node_Id
:= Empty
;
5985 Op_Name
:= Chars
(Actual_Subp
);
5987 -- Create entities for wrapper function and its formals
5989 F1
:= Make_Temporary
(Loc
, 'A');
5990 F2
:= Make_Temporary
(Loc
, 'B');
5991 L
:= New_Occurrence_Of
(F1
, Loc
);
5992 R
:= New_Occurrence_Of
(F2
, Loc
);
5994 Func
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Subp
));
5995 Set_Ekind
(Func
, E_Function
);
5996 Set_Is_Generic_Actual_Subprogram
(Func
);
5999 Make_Function_Specification
(Loc
,
6000 Defining_Unit_Name
=> Func
,
6001 Parameter_Specifications
=> New_List
(
6002 Make_Parameter_Specification
(Loc
,
6003 Defining_Identifier
=> F1
,
6004 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
))),
6005 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
6008 Append_To
(Parameter_Specifications
(Spec
),
6009 Make_Parameter_Specification
(Loc
,
6010 Defining_Identifier
=> F2
,
6011 Parameter_Type
=> New_Occurrence_Of
(Op_Type
, Loc
)));
6014 -- Build expression as a function call, or as an operator node
6015 -- that corresponds to the name of the actual, starting with
6016 -- binary operators.
6018 if Op_Name
not in Any_Operator_Name
then
6020 Make_Function_Call
(Loc
,
6022 New_Occurrence_Of
(Actual_Subp
, Loc
),
6023 Parameter_Associations
=> New_List
(L
));
6026 Append_To
(Parameter_Associations
(Expr
), R
);
6031 elsif Is_Binary
then
6032 if Op_Name
= Name_Op_And
then
6033 Expr
:= Make_Op_And
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6034 elsif Op_Name
= Name_Op_Or
then
6035 Expr
:= Make_Op_Or
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6036 elsif Op_Name
= Name_Op_Xor
then
6037 Expr
:= Make_Op_Xor
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6038 elsif Op_Name
= Name_Op_Eq
then
6039 Expr
:= Make_Op_Eq
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6040 elsif Op_Name
= Name_Op_Ne
then
6041 Expr
:= Make_Op_Ne
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6042 elsif Op_Name
= Name_Op_Le
then
6043 Expr
:= Make_Op_Le
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6044 elsif Op_Name
= Name_Op_Gt
then
6045 Expr
:= Make_Op_Gt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6046 elsif Op_Name
= Name_Op_Ge
then
6047 Expr
:= Make_Op_Ge
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6048 elsif Op_Name
= Name_Op_Lt
then
6049 Expr
:= Make_Op_Lt
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6050 elsif Op_Name
= Name_Op_Add
then
6051 Expr
:= Make_Op_Add
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6052 elsif Op_Name
= Name_Op_Subtract
then
6053 Expr
:= Make_Op_Subtract
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6054 elsif Op_Name
= Name_Op_Concat
then
6055 Expr
:= Make_Op_Concat
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6056 elsif Op_Name
= Name_Op_Multiply
then
6057 Expr
:= Make_Op_Multiply
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6058 elsif Op_Name
= Name_Op_Divide
then
6059 Expr
:= Make_Op_Divide
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6060 elsif Op_Name
= Name_Op_Mod
then
6061 Expr
:= Make_Op_Mod
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6062 elsif Op_Name
= Name_Op_Rem
then
6063 Expr
:= Make_Op_Rem
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6064 elsif Op_Name
= Name_Op_Expon
then
6065 Expr
:= Make_Op_Expon
(Loc
, Left_Opnd
=> L
, Right_Opnd
=> R
);
6071 if Op_Name
= Name_Op_Add
then
6072 Expr
:= Make_Op_Plus
(Loc
, Right_Opnd
=> L
);
6073 elsif Op_Name
= Name_Op_Subtract
then
6074 Expr
:= Make_Op_Minus
(Loc
, Right_Opnd
=> L
);
6075 elsif Op_Name
= Name_Op_Abs
then
6076 Expr
:= Make_Op_Abs
(Loc
, Right_Opnd
=> L
);
6077 elsif Op_Name
= Name_Op_Not
then
6078 Expr
:= Make_Op_Not
(Loc
, Right_Opnd
=> L
);
6083 Make_Expression_Function
(Loc
,
6084 Specification
=> Spec
,
6085 Expression
=> Expr
);
6088 end Build_Operator_Wrapper
;
6090 -------------------------------------------
6091 -- Build_Instance_Compilation_Unit_Nodes --
6092 -------------------------------------------
6094 procedure Build_Instance_Compilation_Unit_Nodes
6099 Decl_Cunit
: Node_Id
;
6100 Body_Cunit
: Node_Id
;
6102 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
6103 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
6106 -- A new compilation unit node is built for the instance declaration
6109 Make_Compilation_Unit
(Sloc
(N
),
6110 Context_Items
=> Empty_List
,
6112 Aux_Decls_Node
=> Make_Compilation_Unit_Aux
(Sloc
(N
)));
6114 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
6116 -- The new compilation unit is linked to its body, but both share the
6117 -- same file, so we do not set Body_Required on the new unit so as not
6118 -- to create a spurious dependency on a non-existent body in the ali.
6119 -- This simplifies CodePeer unit traversal.
6121 -- We use the original instantiation compilation unit as the resulting
6122 -- compilation unit of the instance, since this is the main unit.
6124 Rewrite
(N
, Act_Body
);
6126 -- Propagate the aspect specifications from the package body template to
6127 -- the instantiated version of the package body.
6129 if Has_Aspects
(Act_Body
) then
6130 Set_Aspect_Specifications
6131 (N
, New_Copy_List_Tree
(Aspect_Specifications
(Act_Body
)));
6134 Body_Cunit
:= Parent
(N
);
6136 -- The two compilation unit nodes are linked by the Library_Unit field
6138 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
6139 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
6141 -- Preserve the private nature of the package if needed
6143 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
6145 -- If the instance is not the main unit, its context, categorization
6146 -- and elaboration entity are not relevant to the compilation.
6148 if Body_Cunit
/= Cunit
(Main_Unit
) then
6149 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
6153 -- The context clause items on the instantiation, which are now attached
6154 -- to the body compilation unit (since the body overwrote the original
6155 -- instantiation node), semantically belong on the spec, so copy them
6156 -- there. It's harmless to leave them on the body as well. In fact one
6157 -- could argue that they belong in both places.
6159 Citem
:= First
(Context_Items
(Body_Cunit
));
6160 while Present
(Citem
) loop
6161 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
6165 -- Propagate categorization flags on packages, so that they appear in
6166 -- the ali file for the spec of the unit.
6168 if Ekind
(New_Main
) = E_Package
then
6169 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
6170 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
6171 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
6172 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
6173 Set_Is_Remote_Call_Interface
6174 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
6177 -- Make entry in Units table, so that binder can generate call to
6178 -- elaboration procedure for body, if any.
6180 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
6181 Main_Unit_Entity
:= New_Main
;
6182 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
6184 -- Build elaboration entity, since the instance may certainly generate
6185 -- elaboration code requiring a flag for protection.
6187 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
6188 end Build_Instance_Compilation_Unit_Nodes
;
6190 -----------------------------
6191 -- Check_Access_Definition --
6192 -----------------------------
6194 procedure Check_Access_Definition
(N
: Node_Id
) is
6197 (Ada_Version
>= Ada_2005
and then Present
(Access_Definition
(N
)));
6199 end Check_Access_Definition
;
6201 -----------------------------------
6202 -- Check_Formal_Package_Instance --
6203 -----------------------------------
6205 -- If the formal has specific parameters, they must match those of the
6206 -- actual. Both of them are instances, and the renaming declarations for
6207 -- their formal parameters appear in the same order in both. The analyzed
6208 -- formal has been analyzed in the context of the current instance.
6210 procedure Check_Formal_Package_Instance
6211 (Formal_Pack
: Entity_Id
;
6212 Actual_Pack
: Entity_Id
)
6214 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
6215 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
6216 Prev_E1
: Entity_Id
;
6221 procedure Check_Mismatch
(B
: Boolean);
6222 -- Common error routine for mismatch between the parameters of the
6223 -- actual instance and those of the formal package.
6225 function Is_Defaulted
(Param
: Entity_Id
) return Boolean;
6226 -- If the formal package has partly box-initialized formals, skip
6227 -- conformance check for these formals. Previously the code assumed
6228 -- that box initialization for a formal package applied to all its
6229 -- formal parameters.
6231 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
6232 -- The formal may come from a nested formal package, and the actual may
6233 -- have been constant-folded. To determine whether the two denote the
6234 -- same entity we may have to traverse several definitions to recover
6235 -- the ultimate entity that they refer to.
6237 function Same_Instantiated_Function
(E1
, E2
: Entity_Id
) return Boolean;
6238 -- The formal and the actual must be identical, but if both are
6239 -- given by attributes they end up renaming different generated bodies,
6240 -- and we must verify that the attributes themselves match.
6242 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
6243 -- Similarly, if the formal comes from a nested formal package, the
6244 -- actual may designate the formal through multiple renamings, which
6245 -- have to be followed to determine the original variable in question.
6247 --------------------
6248 -- Check_Mismatch --
6249 --------------------
6251 procedure Check_Mismatch
(B
: Boolean) is
6252 -- A Formal_Type_Declaration for a derived private type is rewritten
6253 -- as a private extension decl. (see Analyze_Formal_Derived_Type),
6254 -- which is why we examine the original node.
6256 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(Parent
(E2
)));
6259 if Kind
= N_Formal_Type_Declaration
then
6262 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
6263 N_Formal_Package_Declaration
)
6264 or else Kind
in N_Formal_Subprogram_Declaration
6268 -- Ada 2012: If both formal and actual are incomplete types they
6271 elsif Is_Incomplete_Type
(E1
) and then Is_Incomplete_Type
(E2
) then
6276 ("actual for & in actual instance does not match formal",
6277 Parent
(Actual_Pack
), E1
);
6285 function Is_Defaulted
(Param
: Entity_Id
) return Boolean is
6290 First
(Generic_Associations
(Parent
6291 (Associated_Formal_Package
(Actual_Pack
))));
6293 while Present
(Assoc
) loop
6294 if Nkind
(Assoc
) = N_Others_Choice
then
6297 elsif Nkind
(Assoc
) = N_Generic_Association
6298 and then Chars
(Selector_Name
(Assoc
)) = Chars
(Param
)
6300 return Box_Present
(Assoc
);
6309 --------------------------------
6310 -- Same_Instantiated_Constant --
6311 --------------------------------
6313 function Same_Instantiated_Constant
6314 (E1
, E2
: Entity_Id
) return Boolean
6320 while Present
(Ent
) loop
6324 elsif Ekind
(Ent
) /= E_Constant
then
6327 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
6328 if Entity
(Constant_Value
(Ent
)) = E1
then
6331 Ent
:= Entity
(Constant_Value
(Ent
));
6334 -- The actual may be a constant that has been folded. Recover
6337 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
6338 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
6346 end Same_Instantiated_Constant
;
6348 --------------------------------
6349 -- Same_Instantiated_Function --
6350 --------------------------------
6352 function Same_Instantiated_Function
6353 (E1
, E2
: Entity_Id
) return Boolean
6357 if Alias
(E1
) = Alias
(E2
) then
6360 elsif Present
(Alias
(E2
)) then
6361 U1
:= Original_Node
(Unit_Declaration_Node
(E1
));
6362 U2
:= Original_Node
(Unit_Declaration_Node
(Alias
(E2
)));
6364 return Nkind
(U1
) = N_Subprogram_Renaming_Declaration
6365 and then Nkind
(Name
(U1
)) = N_Attribute_Reference
6367 and then Nkind
(U2
) = N_Subprogram_Renaming_Declaration
6368 and then Nkind
(Name
(U2
)) = N_Attribute_Reference
6371 Attribute_Name
(Name
(U1
)) = Attribute_Name
(Name
(U2
));
6375 end Same_Instantiated_Function
;
6377 --------------------------------
6378 -- Same_Instantiated_Variable --
6379 --------------------------------
6381 function Same_Instantiated_Variable
6382 (E1
, E2
: Entity_Id
) return Boolean
6384 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
6385 -- Follow chain of renamings to the ultimate ancestor
6387 ---------------------
6388 -- Original_Entity --
6389 ---------------------
6391 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
6396 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
6397 and then Present
(Renamed_Object
(Orig
))
6398 and then Is_Entity_Name
(Renamed_Object
(Orig
))
6400 Orig
:= Entity
(Renamed_Object
(Orig
));
6404 end Original_Entity
;
6406 -- Start of processing for Same_Instantiated_Variable
6409 return Ekind
(E1
) = Ekind
(E2
)
6410 and then Original_Entity
(E1
) = Original_Entity
(E2
);
6411 end Same_Instantiated_Variable
;
6413 -- Start of processing for Check_Formal_Package_Instance
6417 while Present
(E1
) and then Present
(E2
) loop
6418 exit when Ekind
(E1
) = E_Package
6419 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
6421 -- If the formal is the renaming of the formal package, this
6422 -- is the end of its formal part, which may occur before the
6423 -- end of the formal part in the actual in the presence of
6424 -- defaulted parameters in the formal package.
6426 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
6427 and then Renamed_Entity
(E2
) = Scope
(E2
);
6429 -- The analysis of the actual may generate additional internal
6430 -- entities. If the formal is defaulted, there is no corresponding
6431 -- analysis and the internal entities must be skipped, until we
6432 -- find corresponding entities again.
6434 if Comes_From_Source
(E2
)
6435 and then not Comes_From_Source
(E1
)
6436 and then Chars
(E1
) /= Chars
(E2
)
6438 while Present
(E1
) and then Chars
(E1
) /= Chars
(E2
) loop
6446 -- Entities may be declared without full declaration, such as
6447 -- itypes and predefined operators (concatenation for arrays, eg).
6448 -- Skip it and keep the formal entity to find a later match for it.
6450 elsif No
(Parent
(E2
)) and then Ekind
(E1
) /= Ekind
(E2
) then
6454 -- If the formal entity comes from a formal declaration, it was
6455 -- defaulted in the formal package, and no check is needed on it.
6457 elsif Nkind_In
(Original_Node
(Parent
(E2
)),
6458 N_Formal_Object_Declaration
,
6459 N_Formal_Type_Declaration
)
6461 -- If the formal is a tagged type the corresponding class-wide
6462 -- type has been generated as well, and it must be skipped.
6464 if Is_Type
(E2
) and then Is_Tagged_Type
(E2
) then
6470 -- Ditto for defaulted formal subprograms.
6472 elsif Is_Overloadable
(E1
)
6473 and then Nkind
(Unit_Declaration_Node
(E2
)) in
6474 N_Formal_Subprogram_Declaration
6478 elsif Is_Defaulted
(E1
) then
6481 elsif Is_Type
(E1
) then
6483 -- Subtypes must statically match. E1, E2 are the local entities
6484 -- that are subtypes of the actuals. Itypes generated for other
6485 -- parameters need not be checked, the check will be performed
6486 -- on the parameters themselves.
6488 -- If E2 is a formal type declaration, it is a defaulted parameter
6489 -- and needs no checking.
6491 if not Is_Itype
(E1
) and then not Is_Itype
(E2
) then
6494 or else Etype
(E1
) /= Etype
(E2
)
6495 or else not Subtypes_Statically_Match
(E1
, E2
));
6498 elsif Ekind
(E1
) = E_Constant
then
6500 -- IN parameters must denote the same static value, or the same
6501 -- constant, or the literal null.
6503 Expr1
:= Expression
(Parent
(E1
));
6505 if Ekind
(E2
) /= E_Constant
then
6506 Check_Mismatch
(True);
6509 Expr2
:= Expression
(Parent
(E2
));
6512 if Is_OK_Static_Expression
(Expr1
) then
6513 if not Is_OK_Static_Expression
(Expr2
) then
6514 Check_Mismatch
(True);
6516 elsif Is_Discrete_Type
(Etype
(E1
)) then
6518 V1
: constant Uint
:= Expr_Value
(Expr1
);
6519 V2
: constant Uint
:= Expr_Value
(Expr2
);
6521 Check_Mismatch
(V1
/= V2
);
6524 elsif Is_Real_Type
(Etype
(E1
)) then
6526 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
6527 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
6529 Check_Mismatch
(V1
/= V2
);
6532 elsif Is_String_Type
(Etype
(E1
))
6533 and then Nkind
(Expr1
) = N_String_Literal
6535 if Nkind
(Expr2
) /= N_String_Literal
then
6536 Check_Mismatch
(True);
6539 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
6543 elsif Is_Entity_Name
(Expr1
) then
6544 if Is_Entity_Name
(Expr2
) then
6545 if Entity
(Expr1
) = Entity
(Expr2
) then
6549 (not Same_Instantiated_Constant
6550 (Entity
(Expr1
), Entity
(Expr2
)));
6554 Check_Mismatch
(True);
6557 elsif Is_Entity_Name
(Original_Node
(Expr1
))
6558 and then Is_Entity_Name
(Expr2
)
6559 and then Same_Instantiated_Constant
6560 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
6564 elsif Nkind
(Expr1
) = N_Null
then
6565 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
6568 Check_Mismatch
(True);
6571 elsif Ekind
(E1
) = E_Variable
then
6572 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
6574 elsif Ekind
(E1
) = E_Package
then
6576 (Ekind
(E1
) /= Ekind
(E2
)
6577 or else (Present
(Renamed_Object
(E2
))
6578 and then Renamed_Object
(E1
) /=
6579 Renamed_Object
(E2
)));
6581 elsif Is_Overloadable
(E1
) then
6582 -- Verify that the actual subprograms match. Note that actuals
6583 -- that are attributes are rewritten as subprograms. If the
6584 -- subprogram in the formal package is defaulted, no check is
6585 -- needed. Note that this can only happen in Ada 2005 when the
6586 -- formal package can be partially parameterized.
6588 if Nkind
(Unit_Declaration_Node
(E1
)) =
6589 N_Subprogram_Renaming_Declaration
6590 and then From_Default
(Unit_Declaration_Node
(E1
))
6594 -- If the formal package has an "others" box association that
6595 -- covers this formal, there is no need for a check either.
6597 elsif Nkind
(Unit_Declaration_Node
(E2
)) in
6598 N_Formal_Subprogram_Declaration
6599 and then Box_Present
(Unit_Declaration_Node
(E2
))
6603 -- No check needed if subprogram is a defaulted null procedure
6605 elsif No
(Alias
(E2
))
6606 and then Ekind
(E2
) = E_Procedure
6608 Null_Present
(Specification
(Unit_Declaration_Node
(E2
)))
6612 -- Otherwise the actual in the formal and the actual in the
6613 -- instantiation of the formal must match, up to renamings.
6617 (Ekind
(E2
) /= Ekind
(E1
)
6618 or else not Same_Instantiated_Function
(E1
, E2
));
6622 raise Program_Error
;
6630 end Check_Formal_Package_Instance
;
6632 ---------------------------
6633 -- Check_Formal_Packages --
6634 ---------------------------
6636 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
6638 Formal_P
: Entity_Id
;
6639 Formal_Decl
: Node_Id
;
6641 -- Iterate through the declarations in the instance, looking for package
6642 -- renaming declarations that denote instances of formal packages. Stop
6643 -- when we find the renaming of the current package itself. The
6644 -- declaration for a formal package without a box is followed by an
6645 -- internal entity that repeats the instantiation.
6647 E
:= First_Entity
(P_Id
);
6648 while Present
(E
) loop
6649 if Ekind
(E
) = E_Package
then
6650 if Renamed_Object
(E
) = P_Id
then
6653 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6657 Formal_Decl
:= Parent
(Associated_Formal_Package
(E
));
6659 -- Nothing to check if the formal has a box or an others_clause
6660 -- (necessarily with a box), or no associations altogether
6662 if Box_Present
(Formal_Decl
)
6663 or else No
(Generic_Associations
(Formal_Decl
))
6667 elsif Nkind
(First
(Generic_Associations
(Formal_Decl
))) =
6670 -- The internal validating package was generated but formal
6671 -- and instance are known to be compatible.
6673 Formal_P
:= Next_Entity
(E
);
6674 Remove
(Unit_Declaration_Node
(Formal_P
));
6677 Formal_P
:= Next_Entity
(E
);
6679 -- If the instance is within an enclosing instance body
6680 -- there is no need to verify the legality of current formal
6681 -- packages because they were legal in the generic body.
6682 -- This optimization may be applicable elsewhere, and it
6683 -- also removes spurious errors that may arise with
6684 -- on-the-fly inlining and confusion between private and
6687 if not In_Instance_Body
then
6688 Check_Formal_Package_Instance
(Formal_P
, E
);
6691 -- Restore the visibility of formals of the formal instance
6692 -- that are not defaulted, and are hidden within the current
6693 -- generic. These formals may be visible within an enclosing
6699 Elmt
:= First_Elmt
(Hidden_In_Formal_Instance
(Formal_P
));
6700 while Present
(Elmt
) loop
6701 Set_Is_Hidden
(Node
(Elmt
), False);
6706 -- After checking, remove the internal validating package.
6707 -- It is only needed for semantic checks, and as it may
6708 -- contain generic formal declarations it should not reach
6711 Remove
(Unit_Declaration_Node
(Formal_P
));
6718 end Check_Formal_Packages
;
6720 ---------------------------------
6721 -- Check_Forward_Instantiation --
6722 ---------------------------------
6724 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
6726 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
6729 -- The instantiation appears before the generic body if we are in the
6730 -- scope of the unit containing the generic, either in its spec or in
6731 -- the package body, and before the generic body.
6733 if Ekind
(Gen_Comp
) = E_Package_Body
then
6734 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
6737 if In_Open_Scopes
(Gen_Comp
)
6738 and then No
(Corresponding_Body
(Decl
))
6743 and then not Is_Compilation_Unit
(S
)
6744 and then not Is_Child_Unit
(S
)
6746 if Ekind
(S
) = E_Package
then
6747 Set_Has_Forward_Instantiation
(S
);
6753 end Check_Forward_Instantiation
;
6755 ---------------------------
6756 -- Check_Generic_Actuals --
6757 ---------------------------
6759 -- The visibility of the actuals may be different between the point of
6760 -- generic instantiation and the instantiation of the body.
6762 procedure Check_Generic_Actuals
6763 (Instance
: Entity_Id
;
6764 Is_Formal_Box
: Boolean)
6769 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
6770 -- For a formal that is an array type, the component type is often a
6771 -- previous formal in the same unit. The privacy status of the component
6772 -- type will have been examined earlier in the traversal of the
6773 -- corresponding actuals, and this status should not be modified for
6774 -- the array (sub)type itself. However, if the base type of the array
6775 -- (sub)type is private, its full view must be restored in the body to
6776 -- be consistent with subsequent index subtypes, etc.
6778 -- To detect this case we have to rescan the list of formals, which is
6779 -- usually short enough to ignore the resulting inefficiency.
6781 -----------------------------
6782 -- Denotes_Previous_Actual --
6783 -----------------------------
6785 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
6789 Prev
:= First_Entity
(Instance
);
6790 while Present
(Prev
) loop
6792 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
6793 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
6794 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
6807 end Denotes_Previous_Actual
;
6809 -- Start of processing for Check_Generic_Actuals
6812 E
:= First_Entity
(Instance
);
6813 while Present
(E
) loop
6815 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
6816 and then Scope
(Etype
(E
)) /= Instance
6817 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
6819 if Is_Array_Type
(E
)
6820 and then not Is_Private_Type
(Etype
(E
))
6821 and then Denotes_Previous_Actual
(Component_Type
(E
))
6825 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
6828 Set_Is_Generic_Actual_Type
(E
, True);
6829 Set_Is_Hidden
(E
, False);
6830 Set_Is_Potentially_Use_Visible
(E
, In_Use
(Instance
));
6832 -- We constructed the generic actual type as a subtype of the
6833 -- supplied type. This means that it normally would not inherit
6834 -- subtype specific attributes of the actual, which is wrong for
6835 -- the generic case.
6837 Astype
:= Ancestor_Subtype
(E
);
6841 -- This can happen when E is an itype that is the full view of
6842 -- a private type completed, e.g. with a constrained array. In
6843 -- that case, use the first subtype, which will carry size
6844 -- information. The base type itself is unconstrained and will
6847 Astype
:= First_Subtype
(E
);
6850 Set_Size_Info
(E
, (Astype
));
6851 Set_RM_Size
(E
, RM_Size
(Astype
));
6852 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
6854 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
6855 Set_RM_Size
(E
, RM_Size
(Astype
));
6857 -- In nested instances, the base type of an access actual may
6858 -- itself be private, and need to be exchanged.
6860 elsif Is_Access_Type
(E
)
6861 and then Is_Private_Type
(Etype
(E
))
6864 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
6867 elsif Ekind
(E
) = E_Package
then
6869 -- If this is the renaming for the current instance, we're done.
6870 -- Otherwise it is a formal package. If the corresponding formal
6871 -- was declared with a box, the (instantiations of the) generic
6872 -- formal part are also visible. Otherwise, ignore the entity
6873 -- created to validate the actuals.
6875 if Renamed_Object
(E
) = Instance
then
6878 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
6881 -- The visibility of a formal of an enclosing generic is already
6884 elsif Denotes_Formal_Package
(E
) then
6887 elsif Present
(Associated_Formal_Package
(E
))
6888 and then not Is_Generic_Formal
(E
)
6890 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
6891 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6894 Check_Generic_Actuals
(Renamed_Object
(E
), False);
6897 Set_Is_Hidden
(E
, False);
6900 -- If this is a subprogram instance (in a wrapper package) the
6901 -- actual is fully visible.
6903 elsif Is_Wrapper_Package
(Instance
) then
6904 Set_Is_Hidden
(E
, False);
6906 -- If the formal package is declared with a box, or if the formal
6907 -- parameter is defaulted, it is visible in the body.
6909 elsif Is_Formal_Box
or else Is_Visible_Formal
(E
) then
6910 Set_Is_Hidden
(E
, False);
6913 if Ekind
(E
) = E_Constant
then
6915 -- If the type of the actual is a private type declared in the
6916 -- enclosing scope of the generic unit, the body of the generic
6917 -- sees the full view of the type (because it has to appear in
6918 -- the corresponding package body). If the type is private now,
6919 -- exchange views to restore the proper visiblity in the instance.
6922 Typ
: constant Entity_Id
:= Base_Type
(Etype
(E
));
6923 -- The type of the actual
6928 Parent_Scope
: Entity_Id
;
6929 -- The enclosing scope of the generic unit
6932 if Is_Wrapper_Package
(Instance
) then
6936 (Unit_Declaration_Node
6937 (Related_Instance
(Instance
))));
6940 Generic_Parent
(Package_Specification
(Instance
));
6943 Parent_Scope
:= Scope
(Gen_Id
);
6945 -- The exchange is only needed if the generic is defined
6946 -- within a package which is not a common ancestor of the
6947 -- scope of the instance, and is not already in scope.
6949 if Is_Private_Type
(Typ
)
6950 and then Scope
(Typ
) = Parent_Scope
6951 and then Scope
(Instance
) /= Parent_Scope
6952 and then Ekind
(Parent_Scope
) = E_Package
6953 and then not Is_Child_Unit
(Gen_Id
)
6957 -- If the type of the entity is a subtype, it may also have
6958 -- to be made visible, together with the base type of its
6959 -- full view, after exchange.
6961 if Is_Private_Type
(Etype
(E
)) then
6962 Switch_View
(Etype
(E
));
6963 Switch_View
(Base_Type
(Etype
(E
)));
6971 end Check_Generic_Actuals
;
6973 ------------------------------
6974 -- Check_Generic_Child_Unit --
6975 ------------------------------
6977 procedure Check_Generic_Child_Unit
6979 Parent_Installed
: in out Boolean)
6981 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
6982 Gen_Par
: Entity_Id
:= Empty
;
6984 Inst_Par
: Entity_Id
;
6987 function Find_Generic_Child
6989 Id
: Node_Id
) return Entity_Id
;
6990 -- Search generic parent for possible child unit with the given name
6992 function In_Enclosing_Instance
return Boolean;
6993 -- Within an instance of the parent, the child unit may be denoted by
6994 -- a simple name, or an abbreviated expanded name. Examine enclosing
6995 -- scopes to locate a possible parent instantiation.
6997 ------------------------
6998 -- Find_Generic_Child --
6999 ------------------------
7001 function Find_Generic_Child
7003 Id
: Node_Id
) return Entity_Id
7008 -- If entity of name is already set, instance has already been
7009 -- resolved, e.g. in an enclosing instantiation.
7011 if Present
(Entity
(Id
)) then
7012 if Scope
(Entity
(Id
)) = Scop
then
7019 E
:= First_Entity
(Scop
);
7020 while Present
(E
) loop
7021 if Chars
(E
) = Chars
(Id
)
7022 and then Is_Child_Unit
(E
)
7024 if Is_Child_Unit
(E
)
7025 and then not Is_Visible_Lib_Unit
(E
)
7028 ("generic child unit& is not visible", Gen_Id
, E
);
7040 end Find_Generic_Child
;
7042 ---------------------------
7043 -- In_Enclosing_Instance --
7044 ---------------------------
7046 function In_Enclosing_Instance
return Boolean is
7047 Enclosing_Instance
: Node_Id
;
7048 Instance_Decl
: Node_Id
;
7051 -- We do not inline any call that contains instantiations, except
7052 -- for instantiations of Unchecked_Conversion, so if we are within
7053 -- an inlined body the current instance does not require parents.
7055 if In_Inlined_Body
then
7056 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
7060 -- Loop to check enclosing scopes
7062 Enclosing_Instance
:= Current_Scope
;
7063 while Present
(Enclosing_Instance
) loop
7064 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
7066 if Ekind
(Enclosing_Instance
) = E_Package
7067 and then Is_Generic_Instance
(Enclosing_Instance
)
7069 (Generic_Parent
(Specification
(Instance_Decl
)))
7071 -- Check whether the generic we are looking for is a child of
7074 E
:= Find_Generic_Child
7075 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
7076 exit when Present
(E
);
7082 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
7094 Make_Expanded_Name
(Loc
,
7096 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
7097 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
7099 Set_Entity
(Gen_Id
, E
);
7100 Set_Etype
(Gen_Id
, Etype
(E
));
7101 Parent_Installed
:= False; -- Already in scope.
7104 end In_Enclosing_Instance
;
7106 -- Start of processing for Check_Generic_Child_Unit
7109 -- If the name of the generic is given by a selected component, it may
7110 -- be the name of a generic child unit, and the prefix is the name of an
7111 -- instance of the parent, in which case the child unit must be visible.
7112 -- If this instance is not in scope, it must be placed there and removed
7113 -- after instantiation, because what is being instantiated is not the
7114 -- original child, but the corresponding child present in the instance
7117 -- If the child is instantiated within the parent, it can be given by
7118 -- a simple name. In this case the instance is already in scope, but
7119 -- the child generic must be recovered from the generic parent as well.
7121 if Nkind
(Gen_Id
) = N_Selected_Component
then
7122 S
:= Selector_Name
(Gen_Id
);
7123 Analyze
(Prefix
(Gen_Id
));
7124 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7126 if Ekind
(Inst_Par
) = E_Package
7127 and then Present
(Renamed_Object
(Inst_Par
))
7129 Inst_Par
:= Renamed_Object
(Inst_Par
);
7132 if Ekind
(Inst_Par
) = E_Package
then
7133 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
7134 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
7136 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
7138 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
7140 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
7143 elsif Ekind
(Inst_Par
) = E_Generic_Package
7144 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
7146 -- A formal package may be a real child package, and not the
7147 -- implicit instance within a parent. In this case the child is
7148 -- not visible and has to be retrieved explicitly as well.
7150 Gen_Par
:= Inst_Par
;
7153 if Present
(Gen_Par
) then
7155 -- The prefix denotes an instantiation. The entity itself may be a
7156 -- nested generic, or a child unit.
7158 E
:= Find_Generic_Child
(Gen_Par
, S
);
7161 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
7162 Set_Entity
(Gen_Id
, E
);
7163 Set_Etype
(Gen_Id
, Etype
(E
));
7165 Set_Etype
(S
, Etype
(E
));
7167 -- Indicate that this is a reference to the parent
7169 if In_Extended_Main_Source_Unit
(Gen_Id
) then
7170 Set_Is_Instantiated
(Inst_Par
);
7173 -- A common mistake is to replicate the naming scheme of a
7174 -- hierarchy by instantiating a generic child directly, rather
7175 -- than the implicit child in a parent instance:
7177 -- generic .. package Gpar is ..
7178 -- generic .. package Gpar.Child is ..
7179 -- package Par is new Gpar ();
7182 -- package Par.Child is new Gpar.Child ();
7183 -- rather than Par.Child
7185 -- In this case the instantiation is within Par, which is an
7186 -- instance, but Gpar does not denote Par because we are not IN
7187 -- the instance of Gpar, so this is illegal. The test below
7188 -- recognizes this particular case.
7190 if Is_Child_Unit
(E
)
7191 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
7192 and then (not In_Instance
7193 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
7197 ("prefix of generic child unit must be instance of parent",
7201 if not In_Open_Scopes
(Inst_Par
)
7202 and then Nkind
(Parent
(Gen_Id
)) not in
7203 N_Generic_Renaming_Declaration
7205 Install_Parent
(Inst_Par
);
7206 Parent_Installed
:= True;
7208 elsif In_Open_Scopes
(Inst_Par
) then
7210 -- If the parent is already installed, install the actuals
7211 -- for its formal packages. This is necessary when the child
7212 -- instance is a child of the parent instance: in this case,
7213 -- the parent is placed on the scope stack but the formal
7214 -- packages are not made visible.
7216 Install_Formal_Packages
(Inst_Par
);
7220 -- If the generic parent does not contain an entity that
7221 -- corresponds to the selector, the instance doesn't either.
7222 -- Analyzing the node will yield the appropriate error message.
7223 -- If the entity is not a child unit, then it is an inner
7224 -- generic in the parent.
7232 if Is_Child_Unit
(Entity
(Gen_Id
))
7234 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7235 and then not In_Open_Scopes
(Inst_Par
)
7237 Install_Parent
(Inst_Par
);
7238 Parent_Installed
:= True;
7240 -- The generic unit may be the renaming of the implicit child
7241 -- present in an instance. In that case the parent instance is
7242 -- obtained from the name of the renamed entity.
7244 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
7245 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
7246 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
7249 Renamed_Package
: constant Node_Id
:=
7250 Name
(Parent
(Entity
(Gen_Id
)));
7252 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
7253 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
7254 Install_Parent
(Inst_Par
);
7255 Parent_Installed
:= True;
7261 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
7263 -- Entity already present, analyze prefix, whose meaning may be an
7264 -- instance in the current context. If it is an instance of a
7265 -- relative within another, the proper parent may still have to be
7266 -- installed, if they are not of the same generation.
7268 Analyze
(Prefix
(Gen_Id
));
7270 -- Prevent cascaded errors
7272 if Etype
(Prefix
(Gen_Id
)) = Any_Type
then
7276 -- In the unlikely case that a local declaration hides the name of
7277 -- the parent package, locate it on the homonym chain. If the context
7278 -- is an instance of the parent, the renaming entity is flagged as
7281 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7282 while Present
(Inst_Par
)
7283 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
7285 Inst_Par
:= Homonym
(Inst_Par
);
7288 pragma Assert
(Present
(Inst_Par
));
7289 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
7291 if In_Enclosing_Instance
then
7294 elsif Present
(Entity
(Gen_Id
))
7295 and then Is_Child_Unit
(Entity
(Gen_Id
))
7296 and then not In_Open_Scopes
(Inst_Par
)
7298 Install_Parent
(Inst_Par
);
7299 Parent_Installed
:= True;
7302 elsif In_Enclosing_Instance
then
7304 -- The child unit is found in some enclosing scope
7311 -- If this is the renaming of the implicit child in a parent
7312 -- instance, recover the parent name and install it.
7314 if Is_Entity_Name
(Gen_Id
) then
7315 E
:= Entity
(Gen_Id
);
7317 if Is_Generic_Unit
(E
)
7318 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
7319 and then Is_Child_Unit
(Renamed_Object
(E
))
7320 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
7321 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
7323 Rewrite
(Gen_Id
, New_Copy_Tree
(Name
(Parent
(E
))));
7324 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
7326 if not In_Open_Scopes
(Inst_Par
) then
7327 Install_Parent
(Inst_Par
);
7328 Parent_Installed
:= True;
7331 -- If it is a child unit of a non-generic parent, it may be
7332 -- use-visible and given by a direct name. Install parent as
7335 elsif Is_Generic_Unit
(E
)
7336 and then Is_Child_Unit
(E
)
7338 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
7339 and then not Is_Generic_Unit
(Scope
(E
))
7341 if not In_Open_Scopes
(Scope
(E
)) then
7342 Install_Parent
(Scope
(E
));
7343 Parent_Installed
:= True;
7348 end Check_Generic_Child_Unit
;
7350 -----------------------------
7351 -- Check_Hidden_Child_Unit --
7352 -----------------------------
7354 procedure Check_Hidden_Child_Unit
7356 Gen_Unit
: Entity_Id
;
7357 Act_Decl_Id
: Entity_Id
)
7359 Gen_Id
: constant Node_Id
:= Name
(N
);
7362 if Is_Child_Unit
(Gen_Unit
)
7363 and then Is_Child_Unit
(Act_Decl_Id
)
7364 and then Nkind
(Gen_Id
) = N_Expanded_Name
7365 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
7366 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
7368 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
7370 ("generic unit & is implicitly declared in &",
7371 Defining_Unit_Name
(N
), Gen_Unit
);
7372 Error_Msg_N
("\instance must have different name",
7373 Defining_Unit_Name
(N
));
7375 end Check_Hidden_Child_Unit
;
7377 ------------------------
7378 -- Check_Private_View --
7379 ------------------------
7381 procedure Check_Private_View
(N
: Node_Id
) is
7382 T
: constant Entity_Id
:= Etype
(N
);
7386 -- Exchange views if the type was not private in the generic but is
7387 -- private at the point of instantiation. Do not exchange views if
7388 -- the scope of the type is in scope. This can happen if both generic
7389 -- and instance are sibling units, or if type is defined in a parent.
7390 -- In this case the visibility of the type will be correct for all
7394 BT
:= Base_Type
(T
);
7396 if Is_Private_Type
(T
)
7397 and then not Has_Private_View
(N
)
7398 and then Present
(Full_View
(T
))
7399 and then not In_Open_Scopes
(Scope
(T
))
7401 -- In the generic, the full type was visible. Save the private
7402 -- entity, for subsequent exchange.
7406 elsif Has_Private_View
(N
)
7407 and then not Is_Private_Type
(T
)
7408 and then not Has_Been_Exchanged
(T
)
7409 and then Etype
(Get_Associated_Node
(N
)) /= T
7411 -- Only the private declaration was visible in the generic. If
7412 -- the type appears in a subtype declaration, the subtype in the
7413 -- instance must have a view compatible with that of its parent,
7414 -- which must be exchanged (see corresponding code in Restore_
7415 -- Private_Views). Otherwise, if the type is defined in a parent
7416 -- unit, leave full visibility within instance, which is safe.
7418 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
7419 and then not Is_Private_Type
(Base_Type
(T
))
7420 and then Comes_From_Source
(Base_Type
(T
))
7424 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
7425 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
7427 Prepend_Elmt
(T
, Exchanged_Views
);
7428 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
7431 -- For composite types with inconsistent representation exchange
7432 -- component types accordingly.
7434 elsif Is_Access_Type
(T
)
7435 and then Is_Private_Type
(Designated_Type
(T
))
7436 and then not Has_Private_View
(N
)
7437 and then Present
(Full_View
(Designated_Type
(T
)))
7439 Switch_View
(Designated_Type
(T
));
7441 elsif Is_Array_Type
(T
) then
7442 if Is_Private_Type
(Component_Type
(T
))
7443 and then not Has_Private_View
(N
)
7444 and then Present
(Full_View
(Component_Type
(T
)))
7446 Switch_View
(Component_Type
(T
));
7449 -- The normal exchange mechanism relies on the setting of a
7450 -- flag on the reference in the generic. However, an additional
7451 -- mechanism is needed for types that are not explicitly
7452 -- mentioned in the generic, but may be needed in expanded code
7453 -- in the instance. This includes component types of arrays and
7454 -- designated types of access types. This processing must also
7455 -- include the index types of arrays which we take care of here.
7462 Indx
:= First_Index
(T
);
7463 while Present
(Indx
) loop
7464 Typ
:= Base_Type
(Etype
(Indx
));
7466 if Is_Private_Type
(Typ
)
7467 and then Present
(Full_View
(Typ
))
7476 elsif Is_Private_Type
(T
)
7477 and then Present
(Full_View
(T
))
7478 and then Is_Array_Type
(Full_View
(T
))
7479 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
7483 -- Finally, a non-private subtype may have a private base type, which
7484 -- must be exchanged for consistency. This can happen when a package
7485 -- body is instantiated, when the scope stack is empty but in fact
7486 -- the subtype and the base type are declared in an enclosing scope.
7488 -- Note that in this case we introduce an inconsistency in the view
7489 -- set, because we switch the base type BT, but there could be some
7490 -- private dependent subtypes of BT which remain unswitched. Such
7491 -- subtypes might need to be switched at a later point (see specific
7492 -- provision for that case in Switch_View).
7494 elsif not Is_Private_Type
(T
)
7495 and then not Has_Private_View
(N
)
7496 and then Is_Private_Type
(BT
)
7497 and then Present
(Full_View
(BT
))
7498 and then not Is_Generic_Type
(BT
)
7499 and then not In_Open_Scopes
(BT
)
7501 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
7502 Exchange_Declarations
(BT
);
7505 end Check_Private_View
;
7507 -----------------------------
7508 -- Check_Hidden_Primitives --
7509 -----------------------------
7511 function Check_Hidden_Primitives
(Assoc_List
: List_Id
) return Elist_Id
is
7514 Result
: Elist_Id
:= No_Elist
;
7517 if No
(Assoc_List
) then
7521 -- Traverse the list of associations between formals and actuals
7522 -- searching for renamings of tagged types
7524 Actual
:= First
(Assoc_List
);
7525 while Present
(Actual
) loop
7526 if Nkind
(Actual
) = N_Subtype_Declaration
then
7527 Gen_T
:= Generic_Parent_Type
(Actual
);
7529 if Present
(Gen_T
) and then Is_Tagged_Type
(Gen_T
) then
7531 -- Traverse the list of primitives of the actual types
7532 -- searching for hidden primitives that are visible in the
7533 -- corresponding generic formal; leave them visible and
7534 -- append them to Result to restore their decoration later.
7536 Install_Hidden_Primitives
7537 (Prims_List
=> Result
,
7539 Act_T
=> Entity
(Subtype_Indication
(Actual
)));
7547 end Check_Hidden_Primitives
;
7549 --------------------------
7550 -- Contains_Instance_Of --
7551 --------------------------
7553 function Contains_Instance_Of
7556 N
: Node_Id
) return Boolean
7564 -- Verify that there are no circular instantiations. We check whether
7565 -- the unit contains an instance of the current scope or some enclosing
7566 -- scope (in case one of the instances appears in a subunit). Longer
7567 -- circularities involving subunits might seem too pathological to
7568 -- consider, but they were not too pathological for the authors of
7569 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
7570 -- enclosing generic scopes as containing an instance.
7573 -- Within a generic subprogram body, the scope is not generic, to
7574 -- allow for recursive subprograms. Use the declaration to determine
7575 -- whether this is a generic unit.
7577 if Ekind
(Scop
) = E_Generic_Package
7578 or else (Is_Subprogram
(Scop
)
7579 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
7580 N_Generic_Subprogram_Declaration
)
7582 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
7584 while Present
(Elmt
) loop
7585 if Node
(Elmt
) = Scop
then
7586 Error_Msg_Node_2
:= Inner
;
7588 ("circular Instantiation: & instantiated within &!",
7592 elsif Node
(Elmt
) = Inner
then
7595 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
7596 Error_Msg_Node_2
:= Inner
;
7598 ("circular Instantiation: & instantiated within &!",
7606 -- Indicate that Inner is being instantiated within Scop
7608 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
7611 if Scop
= Standard_Standard
then
7614 Scop
:= Scope
(Scop
);
7619 end Contains_Instance_Of
;
7621 -----------------------
7622 -- Copy_Generic_Node --
7623 -----------------------
7625 function Copy_Generic_Node
7627 Parent_Id
: Node_Id
;
7628 Instantiating
: Boolean) return Node_Id
7633 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
7634 -- Check the given value of one of the Fields referenced by the current
7635 -- node to determine whether to copy it recursively. The field may hold
7636 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint,
7637 -- Char) in which case it need not be copied.
7639 procedure Copy_Descendants
;
7640 -- Common utility for various nodes
7642 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
7643 -- Make copy of element list
7645 function Copy_Generic_List
7647 Parent_Id
: Node_Id
) return List_Id
;
7648 -- Apply Copy_Node recursively to the members of a node list
7650 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
7651 -- True if an identifier is part of the defining program unit name of
7652 -- a child unit. The entity of such an identifier must be kept (for
7653 -- ASIS use) even though as the name of an enclosing generic it would
7654 -- otherwise not be preserved in the generic tree.
7656 ----------------------
7657 -- Copy_Descendants --
7658 ----------------------
7660 procedure Copy_Descendants
is
7661 use Atree
.Unchecked_Access
;
7662 -- This code section is part of the implementation of an untyped
7663 -- tree traversal, so it needs direct access to node fields.
7666 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
7667 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
7668 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
7669 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
7670 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
7671 end Copy_Descendants
;
7673 -----------------------------
7674 -- Copy_Generic_Descendant --
7675 -----------------------------
7677 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
7679 if D
= Union_Id
(Empty
) then
7682 elsif D
in Node_Range
then
7684 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
7686 elsif D
in List_Range
then
7687 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
7689 elsif D
in Elist_Range
then
7690 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
7692 -- Nothing else is copyable (e.g. Uint values), return as is
7697 end Copy_Generic_Descendant
;
7699 ------------------------
7700 -- Copy_Generic_Elist --
7701 ------------------------
7703 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
7710 M
:= First_Elmt
(E
);
7711 while Present
(M
) loop
7713 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
7722 end Copy_Generic_Elist
;
7724 -----------------------
7725 -- Copy_Generic_List --
7726 -----------------------
7728 function Copy_Generic_List
7730 Parent_Id
: Node_Id
) return List_Id
7738 Set_Parent
(New_L
, Parent_Id
);
7741 while Present
(N
) loop
7742 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
7751 end Copy_Generic_List
;
7753 ---------------------------
7754 -- In_Defining_Unit_Name --
7755 ---------------------------
7757 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
7760 Present
(Parent
(Nam
))
7761 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
7763 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
7764 and then In_Defining_Unit_Name
(Parent
(Nam
))));
7765 end In_Defining_Unit_Name
;
7767 -- Start of processing for Copy_Generic_Node
7774 New_N
:= New_Copy
(N
);
7776 -- Copy aspects if present
7778 if Has_Aspects
(N
) then
7779 Set_Has_Aspects
(New_N
, False);
7780 Set_Aspect_Specifications
7781 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
7784 -- If we are instantiating, we want to adjust the sloc based on the
7785 -- current S_Adjustment. However, if this is the root node of a subunit,
7786 -- we need to defer that adjustment to below (see "elsif Instantiating
7787 -- and Was_Stub"), so it comes after Create_Instantiation_Source has
7788 -- computed the adjustment.
7791 and then not (Nkind
(N
) in N_Proper_Body
7792 and then Was_Originally_Stub
(N
))
7794 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
7797 if not Is_List_Member
(N
) then
7798 Set_Parent
(New_N
, Parent_Id
);
7801 -- Special casing for identifiers and other entity names and operators
7803 if Nkind_In
(New_N
, N_Character_Literal
,
7807 or else Nkind
(New_N
) in N_Op
7809 if not Instantiating
then
7811 -- Link both nodes in order to assign subsequently the entity of
7812 -- the copy to the original node, in case this is a global
7815 Set_Associated_Node
(N
, New_N
);
7817 -- If we are within an instantiation, this is a nested generic
7818 -- that has already been analyzed at the point of definition.
7819 -- We must preserve references that were global to the enclosing
7820 -- parent at that point. Other occurrences, whether global or
7821 -- local to the current generic, must be resolved anew, so we
7822 -- reset the entity in the generic copy. A global reference has a
7823 -- smaller depth than the parent, or else the same depth in case
7824 -- both are distinct compilation units.
7826 -- A child unit is implicitly declared within the enclosing parent
7827 -- but is in fact global to it, and must be preserved.
7829 -- It is also possible for Current_Instantiated_Parent to be
7830 -- defined, and for this not to be a nested generic, namely if
7831 -- the unit is loaded through Rtsfind. In that case, the entity of
7832 -- New_N is only a link to the associated node, and not a defining
7835 -- The entities for parent units in the defining_program_unit of a
7836 -- generic child unit are established when the context of the unit
7837 -- is first analyzed, before the generic copy is made. They are
7838 -- preserved in the copy for use in ASIS queries.
7840 Ent
:= Entity
(New_N
);
7842 if No
(Current_Instantiated_Parent
.Gen_Id
) then
7844 or else Nkind
(Ent
) /= N_Defining_Identifier
7845 or else not In_Defining_Unit_Name
(N
)
7847 Set_Associated_Node
(New_N
, Empty
);
7852 not Nkind_In
(Ent
, N_Defining_Identifier
,
7853 N_Defining_Character_Literal
,
7854 N_Defining_Operator_Symbol
)
7855 or else No
(Scope
(Ent
))
7857 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
7858 and then not Is_Child_Unit
(Ent
))
7860 (Scope_Depth
(Scope
(Ent
)) >
7861 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
7863 Get_Source_Unit
(Ent
) =
7864 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
7866 Set_Associated_Node
(New_N
, Empty
);
7869 -- Case of instantiating identifier or some other name or operator
7872 -- If the associated node is still defined, the entity in it
7873 -- is global, and must be copied to the instance. If this copy
7874 -- is being made for a body to inline, it is applied to an
7875 -- instantiated tree, and the entity is already present and
7876 -- must be also preserved.
7879 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
7882 if Present
(Assoc
) then
7883 if Nkind
(Assoc
) = Nkind
(N
) then
7884 Set_Entity
(New_N
, Entity
(Assoc
));
7885 Check_Private_View
(N
);
7887 -- The node is a reference to a global type and acts as the
7888 -- subtype mark of a qualified expression created in order
7889 -- to aid resolution of accidental overloading in instances.
7890 -- Since N is a reference to a type, the Associated_Node of
7891 -- N denotes an entity rather than another identifier. See
7892 -- Qualify_Universal_Operands for details.
7894 elsif Nkind
(N
) = N_Identifier
7895 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
7896 and then Subtype_Mark
(Parent
(N
)) = N
7897 and then Is_Qualified_Universal_Literal
(Parent
(N
))
7899 Set_Entity
(New_N
, Assoc
);
7901 -- The name in the call may be a selected component if the
7902 -- call has not been analyzed yet, as may be the case for
7903 -- pre/post conditions in a generic unit.
7905 elsif Nkind
(Assoc
) = N_Function_Call
7906 and then Is_Entity_Name
(Name
(Assoc
))
7908 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
7910 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
7911 N_Defining_Character_Literal
,
7912 N_Defining_Operator_Symbol
)
7913 and then Expander_Active
7915 -- Inlining case: we are copying a tree that contains
7916 -- global entities, which are preserved in the copy to be
7917 -- used for subsequent inlining.
7922 Set_Entity
(New_N
, Empty
);
7928 -- For expanded name, we must copy the Prefix and Selector_Name
7930 if Nkind
(N
) = N_Expanded_Name
then
7932 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
7934 Set_Selector_Name
(New_N
,
7935 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
7937 -- For operators, copy the operands
7939 elsif Nkind
(N
) in N_Op
then
7940 if Nkind
(N
) in N_Binary_Op
then
7941 Set_Left_Opnd
(New_N
,
7942 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
7945 Set_Right_Opnd
(New_N
,
7946 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
7949 -- Establish a link between an entity from the generic template and the
7950 -- corresponding entity in the generic copy to be analyzed.
7952 elsif Nkind
(N
) in N_Entity
then
7953 if not Instantiating
then
7954 Set_Associated_Entity
(N
, New_N
);
7957 -- Clear any existing link the copy may inherit from the replicated
7958 -- generic template entity.
7960 Set_Associated_Entity
(New_N
, Empty
);
7962 -- Special casing for stubs
7964 elsif Nkind
(N
) in N_Body_Stub
then
7966 -- In any case, we must copy the specification or defining
7967 -- identifier as appropriate.
7969 if Nkind
(N
) = N_Subprogram_Body_Stub
then
7970 Set_Specification
(New_N
,
7971 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
7974 Set_Defining_Identifier
(New_N
,
7976 (Defining_Identifier
(N
), New_N
, Instantiating
));
7979 -- If we are not instantiating, then this is where we load and
7980 -- analyze subunits, i.e. at the point where the stub occurs. A
7981 -- more permissive system might defer this analysis to the point
7982 -- of instantiation, but this seems too complicated for now.
7984 if not Instantiating
then
7986 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
7988 Unum
: Unit_Number_Type
;
7992 -- Make sure that, if it is a subunit of the main unit that is
7993 -- preprocessed and if -gnateG is specified, the preprocessed
7994 -- file will be written.
7996 Lib
.Analysing_Subunit_Of_Main
:=
7997 Lib
.In_Extended_Main_Source_Unit
(N
);
8000 (Load_Name
=> Subunit_Name
,
8004 Lib
.Analysing_Subunit_Of_Main
:= False;
8006 -- If the proper body is not found, a warning message will be
8007 -- emitted when analyzing the stub, or later at the point of
8008 -- instantiation. Here we just leave the stub as is.
8010 if Unum
= No_Unit
then
8011 Subunits_Missing
:= True;
8012 goto Subunit_Not_Found
;
8015 Subunit
:= Cunit
(Unum
);
8017 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
8019 ("found child unit instead of expected SEPARATE subunit",
8021 Error_Msg_Sloc
:= Sloc
(N
);
8022 Error_Msg_N
("\to complete stub #", Subunit
);
8023 goto Subunit_Not_Found
;
8026 -- We must create a generic copy of the subunit, in order to
8027 -- perform semantic analysis on it, and we must replace the
8028 -- stub in the original generic unit with the subunit, in order
8029 -- to preserve non-local references within.
8031 -- Only the proper body needs to be copied. Library_Unit and
8032 -- context clause are simply inherited by the generic copy.
8033 -- Note that the copy (which may be recursive if there are
8034 -- nested subunits) must be done first, before attaching it to
8035 -- the enclosing generic.
8039 (Proper_Body
(Unit
(Subunit
)),
8040 Empty
, Instantiating
=> False);
8042 -- Now place the original proper body in the original generic
8043 -- unit. This is a body, not a compilation unit.
8045 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
8046 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
8047 Set_Was_Originally_Stub
(N
);
8049 -- Finally replace the body of the subunit with its copy, and
8050 -- make this new subunit into the library unit of the generic
8051 -- copy, which does not have stubs any longer.
8053 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
8054 Set_Library_Unit
(New_N
, Subunit
);
8055 Inherit_Context
(Unit
(Subunit
), N
);
8058 -- If we are instantiating, this must be an error case, since
8059 -- otherwise we would have replaced the stub node by the proper body
8060 -- that corresponds. So just ignore it in the copy (i.e. we have
8061 -- copied it, and that is good enough).
8067 <<Subunit_Not_Found
>> null;
8069 -- If the node is a compilation unit, it is the subunit of a stub, which
8070 -- has been loaded already (see code below). In this case, the library
8071 -- unit field of N points to the parent unit (which is a compilation
8072 -- unit) and need not (and cannot) be copied.
8074 -- When the proper body of the stub is analyzed, the library_unit link
8075 -- is used to establish the proper context (see sem_ch10).
8077 -- The other fields of a compilation unit are copied as usual
8079 elsif Nkind
(N
) = N_Compilation_Unit
then
8081 -- This code can only be executed when not instantiating, because in
8082 -- the copy made for an instantiation, the compilation unit node has
8083 -- disappeared at the point that a stub is replaced by its proper
8086 pragma Assert
(not Instantiating
);
8088 Set_Context_Items
(New_N
,
8089 Copy_Generic_List
(Context_Items
(N
), New_N
));
8092 Copy_Generic_Node
(Unit
(N
), New_N
, Instantiating
=> False));
8094 Set_First_Inlined_Subprogram
(New_N
,
8096 (First_Inlined_Subprogram
(N
), New_N
, Instantiating
=> False));
8101 (Aux_Decls_Node
(N
), New_N
, Instantiating
=> False));
8103 -- For an assignment node, the assignment is known to be semantically
8104 -- legal if we are instantiating the template. This avoids incorrect
8105 -- diagnostics in generated code.
8107 elsif Nkind
(N
) = N_Assignment_Statement
then
8109 -- Copy name and expression fields in usual manner
8112 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
8114 Set_Expression
(New_N
,
8115 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
8117 if Instantiating
then
8118 Set_Assignment_OK
(Name
(New_N
), True);
8121 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
8122 if not Instantiating
then
8123 Set_Associated_Node
(N
, New_N
);
8126 if Present
(Get_Associated_Node
(N
))
8127 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
8129 -- In the generic the aggregate has some composite type. If at
8130 -- the point of instantiation the type has a private view,
8131 -- install the full view (and that of its ancestors, if any).
8134 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
8138 if Present
(T
) and then Is_Private_Type
(T
) then
8143 and then Is_Tagged_Type
(T
)
8144 and then Is_Derived_Type
(T
)
8146 Rt
:= Root_Type
(T
);
8151 if Is_Private_Type
(T
) then
8162 -- Do not copy the associated node, which points to the generic copy
8163 -- of the aggregate.
8166 use Atree
.Unchecked_Access
;
8167 -- This code section is part of the implementation of an untyped
8168 -- tree traversal, so it needs direct access to node fields.
8171 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
8172 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
8173 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
8174 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
8177 -- Allocators do not have an identifier denoting the access type, so we
8178 -- must locate it through the expression to check whether the views are
8181 elsif Nkind
(N
) = N_Allocator
8182 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
8183 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
8184 and then Instantiating
8187 T
: constant Node_Id
:=
8188 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
8194 -- Retrieve the allocator node in the generic copy
8196 Acc_T
:= Etype
(Parent
(Parent
(T
)));
8198 if Present
(Acc_T
) and then Is_Private_Type
(Acc_T
) then
8199 Switch_View
(Acc_T
);
8206 -- For a proper body, we must catch the case of a proper body that
8207 -- replaces a stub. This represents the point at which a separate
8208 -- compilation unit, and hence template file, may be referenced, so we
8209 -- must make a new source instantiation entry for the template of the
8210 -- subunit, and ensure that all nodes in the subunit are adjusted using
8211 -- this new source instantiation entry.
8213 elsif Nkind
(N
) in N_Proper_Body
then
8215 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
8217 if Instantiating
and then Was_Originally_Stub
(N
) then
8218 Create_Instantiation_Source
8219 (Instantiation_Node
,
8220 Defining_Entity
(N
),
8223 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
8226 -- Now copy the fields of the proper body, using the new
8227 -- adjustment factor if one was needed as per test above.
8231 -- Restore the original adjustment factor
8233 S_Adjustment
:= Save_Adjustment
;
8236 elsif Nkind
(N
) = N_Pragma
and then Instantiating
then
8238 -- Do not copy Comment or Ident pragmas their content is relevant to
8239 -- the generic unit, not to the instantiating unit.
8241 if Nam_In
(Pragma_Name_Unmapped
(N
), Name_Comment
, Name_Ident
) then
8242 New_N
:= Make_Null_Statement
(Sloc
(N
));
8244 -- Do not copy pragmas generated from aspects because the pragmas do
8245 -- not carry any semantic information, plus they will be regenerated
8248 -- However, generating C we need to copy them since postconditions
8249 -- are inlined by the front end, and the front-end inlining machinery
8250 -- relies on this routine to perform inlining.
8252 elsif From_Aspect_Specification
(N
)
8253 and then not Modify_Tree_For_C
8255 New_N
:= Make_Null_Statement
(Sloc
(N
));
8261 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
8263 -- No descendant fields need traversing
8267 elsif Nkind
(N
) = N_String_Literal
8268 and then Present
(Etype
(N
))
8269 and then Instantiating
8271 -- If the string is declared in an outer scope, the string_literal
8272 -- subtype created for it may have the wrong scope. Force reanalysis
8273 -- of the constant to generate a new itype in the proper context.
8275 Set_Etype
(New_N
, Empty
);
8276 Set_Analyzed
(New_N
, False);
8278 -- For the remaining nodes, copy their descendants recursively
8283 if Instantiating
and then Nkind
(N
) = N_Subprogram_Body
then
8284 Set_Generic_Parent
(Specification
(New_N
), N
);
8286 -- Should preserve Corresponding_Spec??? (12.3(14))
8290 -- Propagate dimensions if present, so that they are reflected in the
8293 if Nkind
(N
) in N_Has_Etype
8294 and then (Nkind
(N
) in N_Op
or else Is_Entity_Name
(N
))
8295 and then Present
(Etype
(N
))
8296 and then Is_Floating_Point_Type
(Etype
(N
))
8297 and then Has_Dimension_System
(Etype
(N
))
8299 Copy_Dimensions
(N
, New_N
);
8303 end Copy_Generic_Node
;
8305 ----------------------------
8306 -- Denotes_Formal_Package --
8307 ----------------------------
8309 function Denotes_Formal_Package
8311 On_Exit
: Boolean := False;
8312 Instance
: Entity_Id
:= Empty
) return Boolean
8315 Scop
: constant Entity_Id
:= Scope
(Pack
);
8318 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
8319 -- The package in question may be an actual for a previous formal
8320 -- package P of the current instance, so examine its actuals as well.
8321 -- This must be recursive over other formal packages.
8323 ----------------------------------
8324 -- Is_Actual_Of_Previous_Formal --
8325 ----------------------------------
8327 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
8331 E1
:= First_Entity
(P
);
8332 while Present
(E1
) and then E1
/= Instance
loop
8333 if Ekind
(E1
) = E_Package
8334 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
8336 if Renamed_Object
(E1
) = Pack
then
8339 elsif E1
= P
or else Renamed_Object
(E1
) = P
then
8342 elsif Is_Actual_Of_Previous_Formal
(E1
) then
8351 end Is_Actual_Of_Previous_Formal
;
8353 -- Start of processing for Denotes_Formal_Package
8359 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
8361 Par
:= Current_Instantiated_Parent
.Act_Id
;
8364 if Ekind
(Scop
) = E_Generic_Package
8365 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
8366 N_Generic_Subprogram_Declaration
8370 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
8371 N_Formal_Package_Declaration
8379 -- Check whether this package is associated with a formal package of
8380 -- the enclosing instantiation. Iterate over the list of renamings.
8382 E
:= First_Entity
(Par
);
8383 while Present
(E
) loop
8384 if Ekind
(E
) /= E_Package
8385 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
8389 elsif Renamed_Object
(E
) = Par
then
8392 elsif Renamed_Object
(E
) = Pack
then
8395 elsif Is_Actual_Of_Previous_Formal
(E
) then
8405 end Denotes_Formal_Package
;
8411 procedure End_Generic
is
8413 -- ??? More things could be factored out in this routine. Should
8414 -- probably be done at a later stage.
8416 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
8417 Generic_Flags
.Decrement_Last
;
8419 Expander_Mode_Restore
;
8426 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
8427 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
8428 -- Find distance from given node to enclosing compilation unit
8434 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
8437 and then Nkind
(P
) /= N_Compilation_Unit
8439 P
:= True_Parent
(P
);
8444 -- Local declarations
8453 -- Start of processing for Earlier
8456 Find_Depth
(P1
, D1
);
8457 Find_Depth
(P2
, D2
);
8467 P1
:= True_Parent
(P1
);
8472 P2
:= True_Parent
(P2
);
8476 -- At this point P1 and P2 are at the same distance from the root.
8477 -- We examine their parents until we find a common declarative list.
8478 -- If we reach the root, N1 and N2 do not descend from the same
8479 -- declarative list (e.g. one is nested in the declarative part and
8480 -- the other is in a block in the statement part) and the earlier
8481 -- one is already frozen.
8483 while not Is_List_Member
(P1
)
8484 or else not Is_List_Member
(P2
)
8485 or else List_Containing
(P1
) /= List_Containing
(P2
)
8487 P1
:= True_Parent
(P1
);
8488 P2
:= True_Parent
(P2
);
8490 if Nkind
(Parent
(P1
)) = N_Subunit
then
8491 P1
:= Corresponding_Stub
(Parent
(P1
));
8494 if Nkind
(Parent
(P2
)) = N_Subunit
then
8495 P2
:= Corresponding_Stub
(Parent
(P2
));
8503 -- Expanded code usually shares the source location of the original
8504 -- construct it was generated for. This however may not necessarily
8505 -- reflect the true location of the code within the tree.
8507 -- Before comparing the slocs of the two nodes, make sure that we are
8508 -- working with correct source locations. Assume that P1 is to the left
8509 -- of P2. If either one does not come from source, traverse the common
8510 -- list heading towards the other node and locate the first source
8514 -- ----+===+===+--------------+===+===+----
8515 -- expanded code expanded code
8517 if not Comes_From_Source
(P1
) then
8518 while Present
(P1
) loop
8520 -- Neither P2 nor a source statement were located during the
8521 -- search. If we reach the end of the list, then P1 does not
8522 -- occur earlier than P2.
8525 -- start --- P2 ----- P1 --- end
8527 if No
(Next
(P1
)) then
8530 -- We encounter P2 while going to the right of the list. This
8531 -- means that P1 does indeed appear earlier.
8534 -- start --- P1 ===== P2 --- end
8535 -- expanded code in between
8540 -- No need to look any further since we have located a source
8543 elsif Comes_From_Source
(P1
) then
8553 if not Comes_From_Source
(P2
) then
8554 while Present
(P2
) loop
8556 -- Neither P1 nor a source statement were located during the
8557 -- search. If we reach the start of the list, then P1 does not
8558 -- occur earlier than P2.
8561 -- start --- P2 --- P1 --- end
8563 if No
(Prev
(P2
)) then
8566 -- We encounter P1 while going to the left of the list. This
8567 -- means that P1 does indeed appear earlier.
8570 -- start --- P1 ===== P2 --- end
8571 -- expanded code in between
8576 -- No need to look any further since we have located a source
8579 elsif Comes_From_Source
(P2
) then
8589 -- At this point either both nodes came from source or we approximated
8590 -- their source locations through neighboring source statements.
8592 T1
:= Top_Level_Location
(Sloc
(P1
));
8593 T2
:= Top_Level_Location
(Sloc
(P2
));
8595 -- When two nodes come from the same instance, they have identical top
8596 -- level locations. To determine proper relation within the tree, check
8597 -- their locations within the template.
8600 return Sloc
(P1
) < Sloc
(P2
);
8602 -- The two nodes either come from unrelated instances or do not come
8603 -- from instantiated code at all.
8610 ----------------------
8611 -- Find_Actual_Type --
8612 ----------------------
8614 function Find_Actual_Type
8616 Gen_Type
: Entity_Id
) return Entity_Id
8618 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
8622 -- Special processing only applies to child units
8624 if not Is_Child_Unit
(Gen_Scope
) then
8625 return Get_Instance_Of
(Typ
);
8627 -- If designated or component type is itself a formal of the child unit,
8628 -- its instance is available.
8630 elsif Scope
(Typ
) = Gen_Scope
then
8631 return Get_Instance_Of
(Typ
);
8633 -- If the array or access type is not declared in the parent unit,
8634 -- no special processing needed.
8636 elsif not Is_Generic_Type
(Typ
)
8637 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
8639 return Get_Instance_Of
(Typ
);
8641 -- Otherwise, retrieve designated or component type by visibility
8644 T
:= Current_Entity
(Typ
);
8645 while Present
(T
) loop
8646 if In_Open_Scopes
(Scope
(T
)) then
8648 elsif Is_Generic_Actual_Type
(T
) then
8657 end Find_Actual_Type
;
8659 ----------------------------
8660 -- Freeze_Subprogram_Body --
8661 ----------------------------
8663 procedure Freeze_Subprogram_Body
8664 (Inst_Node
: Node_Id
;
8666 Pack_Id
: Entity_Id
)
8668 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8669 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
8675 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
;
8676 -- Find innermost package body that encloses the given node, and which
8677 -- is not a compilation unit. Freeze nodes for the instance, or for its
8678 -- enclosing body, may be inserted after the enclosing_body of the
8679 -- generic unit. Used to determine proper placement of freeze node for
8680 -- both package and subprogram instances.
8682 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
8683 -- Find entity for given package body, and locate or create a freeze
8686 ----------------------------
8687 -- Enclosing_Package_Body --
8688 ----------------------------
8690 function Enclosing_Package_Body
(N
: Node_Id
) return Node_Id
is
8696 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
8698 if Nkind
(P
) = N_Package_Body
then
8699 if Nkind
(Parent
(P
)) = N_Subunit
then
8700 return Corresponding_Stub
(Parent
(P
));
8706 P
:= True_Parent
(P
);
8710 end Enclosing_Package_Body
;
8712 -------------------------
8713 -- Package_Freeze_Node --
8714 -------------------------
8716 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
8720 if Nkind
(B
) = N_Package_Body
then
8721 Id
:= Corresponding_Spec
(B
);
8722 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
8723 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
8726 Ensure_Freeze_Node
(Id
);
8727 return Freeze_Node
(Id
);
8728 end Package_Freeze_Node
;
8730 -- Start of processing for Freeze_Subprogram_Body
8733 -- If the instance and the generic body appear within the same unit, and
8734 -- the instance precedes the generic, the freeze node for the instance
8735 -- must appear after that of the generic. If the generic is nested
8736 -- within another instance I2, then current instance must be frozen
8737 -- after I2. In both cases, the freeze nodes are those of enclosing
8738 -- packages. Otherwise, the freeze node is placed at the end of the
8739 -- current declarative part.
8741 Enc_G
:= Enclosing_Package_Body
(Gen_Body
);
8742 Enc_I
:= Enclosing_Package_Body
(Inst_Node
);
8743 Ensure_Freeze_Node
(Pack_Id
);
8744 F_Node
:= Freeze_Node
(Pack_Id
);
8746 if Is_Generic_Instance
(Par
)
8747 and then Present
(Freeze_Node
(Par
))
8748 and then In_Same_Declarative_Part
8749 (Parent
(Freeze_Node
(Par
)), Inst_Node
)
8751 -- The parent was a premature instantiation. Insert freeze node at
8752 -- the end the current declarative part.
8754 if Is_Known_Guaranteed_ABE
(Get_Unit_Instantiation_Node
(Par
)) then
8755 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8757 -- Handle the following case:
8759 -- package Parent_Inst is new ...
8762 -- procedure P ... -- this body freezes Parent_Inst
8764 -- package Inst is new ...
8766 -- In this particular scenario, the freeze node for Inst must be
8767 -- inserted in the same manner as that of Parent_Inst - before the
8768 -- next source body or at the end of the declarative list (body not
8769 -- available). If body P did not exist and Parent_Inst was frozen
8770 -- after Inst, either by a body following Inst or at the end of the
8771 -- declarative region, the freeze node for Inst must be inserted
8772 -- after that of Parent_Inst. This relation is established by
8773 -- comparing the Slocs of Parent_Inst freeze node and Inst.
8775 elsif List_Containing
(Get_Unit_Instantiation_Node
(Par
)) =
8776 List_Containing
(Inst_Node
)
8777 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Inst_Node
)
8779 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8782 Insert_After
(Freeze_Node
(Par
), F_Node
);
8785 -- The body enclosing the instance should be frozen after the body that
8786 -- includes the generic, because the body of the instance may make
8787 -- references to entities therein. If the two are not in the same
8788 -- declarative part, or if the one enclosing the instance is frozen
8789 -- already, freeze the instance at the end of the current declarative
8792 elsif Is_Generic_Instance
(Par
)
8793 and then Present
(Freeze_Node
(Par
))
8794 and then Present
(Enc_I
)
8796 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par
)), Enc_I
)
8798 (Nkind
(Enc_I
) = N_Package_Body
8799 and then In_Same_Declarative_Part
8800 (Parent
(Freeze_Node
(Par
)), Parent
(Enc_I
)))
8802 -- The enclosing package may contain several instances. Rather
8803 -- than computing the earliest point at which to insert its freeze
8804 -- node, we place it at the end of the declarative part of the
8805 -- parent of the generic.
8807 Insert_Freeze_Node_For_Instance
8808 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
8811 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8813 elsif Present
(Enc_G
)
8814 and then Present
(Enc_I
)
8815 and then Enc_G
/= Enc_I
8816 and then Earlier
(Inst_Node
, Gen_Body
)
8818 if Nkind
(Enc_G
) = N_Package_Body
then
8820 Corresponding_Spec
(Enc_G
);
8821 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
8823 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
8826 -- Freeze package that encloses instance, and place node after the
8827 -- package that encloses generic. If enclosing package is already
8828 -- frozen we have to assume it is at the proper place. This may be a
8829 -- potential ABE that requires dynamic checking. Do not add a freeze
8830 -- node if the package that encloses the generic is inside the body
8831 -- that encloses the instance, because the freeze node would be in
8832 -- the wrong scope. Additional contortions needed if the bodies are
8833 -- within a subunit.
8836 Enclosing_Body
: Node_Id
;
8839 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
8840 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
8842 Enclosing_Body
:= Enc_I
;
8845 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
8846 Insert_Freeze_Node_For_Instance
8847 (Enc_G
, Package_Freeze_Node
(Enc_I
));
8851 -- Freeze enclosing subunit before instance
8853 Ensure_Freeze_Node
(E_G_Id
);
8855 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
8856 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
8859 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8862 -- If none of the above, insert freeze node at the end of the current
8863 -- declarative part.
8865 Insert_Freeze_Node_For_Instance
(Inst_Node
, F_Node
);
8867 end Freeze_Subprogram_Body
;
8873 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
8875 return Generic_Renamings
.Table
(E
).Gen_Id
;
8878 ---------------------
8879 -- Get_Instance_Of --
8880 ---------------------
8882 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
8883 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
8886 if Res
/= Assoc_Null
then
8887 return Generic_Renamings
.Table
(Res
).Act_Id
;
8890 -- On exit, entity is not instantiated: not a generic parameter, or
8891 -- else parameter of an inner generic unit.
8895 end Get_Instance_Of
;
8897 ---------------------------------
8898 -- Get_Unit_Instantiation_Node --
8899 ---------------------------------
8901 function Get_Unit_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
8902 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
8906 -- If the Package_Instantiation attribute has been set on the package
8907 -- entity, then use it directly when it (or its Original_Node) refers
8908 -- to an N_Package_Instantiation node. In principle it should be
8909 -- possible to have this field set in all cases, which should be
8910 -- investigated, and would allow this function to be significantly
8913 Inst
:= Package_Instantiation
(A
);
8915 if Present
(Inst
) then
8916 if Nkind
(Inst
) = N_Package_Instantiation
then
8919 elsif Nkind
(Original_Node
(Inst
)) = N_Package_Instantiation
then
8920 return Original_Node
(Inst
);
8924 -- If the instantiation is a compilation unit that does not need body
8925 -- then the instantiation node has been rewritten as a package
8926 -- declaration for the instance, and we return the original node.
8928 -- If it is a compilation unit and the instance node has not been
8929 -- rewritten, then it is still the unit of the compilation. Finally, if
8930 -- a body is present, this is a parent of the main unit whose body has
8931 -- been compiled for inlining purposes, and the instantiation node has
8932 -- been rewritten with the instance body.
8934 -- Otherwise the instantiation node appears after the declaration. If
8935 -- the entity is a formal package, the declaration may have been
8936 -- rewritten as a generic declaration (in the case of a formal with box)
8937 -- or left as a formal package declaration if it has actuals, and is
8938 -- found with a forward search.
8940 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
8941 if Nkind
(Decl
) = N_Package_Declaration
8942 and then Present
(Corresponding_Body
(Decl
))
8944 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
8947 if Nkind_In
(Original_Node
(Decl
), N_Function_Instantiation
,
8948 N_Package_Instantiation
,
8949 N_Procedure_Instantiation
)
8951 return Original_Node
(Decl
);
8953 return Unit
(Parent
(Decl
));
8956 elsif Nkind
(Decl
) = N_Package_Declaration
8957 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
8959 return Original_Node
(Decl
);
8962 Inst
:= Next
(Decl
);
8963 while not Nkind_In
(Inst
, N_Formal_Package_Declaration
,
8964 N_Function_Instantiation
,
8965 N_Package_Instantiation
,
8966 N_Procedure_Instantiation
)
8973 end Get_Unit_Instantiation_Node
;
8975 ------------------------
8976 -- Has_Been_Exchanged --
8977 ------------------------
8979 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
8983 Next
:= First_Elmt
(Exchanged_Views
);
8984 while Present
(Next
) loop
8985 if Full_View
(Node
(Next
)) = E
then
8993 end Has_Been_Exchanged
;
8999 function Hash
(F
: Entity_Id
) return HTable_Range
is
9001 return HTable_Range
(F
mod HTable_Size
);
9004 ------------------------
9005 -- Hide_Current_Scope --
9006 ------------------------
9008 procedure Hide_Current_Scope
is
9009 C
: constant Entity_Id
:= Current_Scope
;
9013 Set_Is_Hidden_Open_Scope
(C
);
9015 E
:= First_Entity
(C
);
9016 while Present
(E
) loop
9017 if Is_Immediately_Visible
(E
) then
9018 Set_Is_Immediately_Visible
(E
, False);
9019 Append_Elmt
(E
, Hidden_Entities
);
9025 -- Make the scope name invisible as well. This is necessary, but might
9026 -- conflict with calls to Rtsfind later on, in case the scope is a
9027 -- predefined one. There is no clean solution to this problem, so for
9028 -- now we depend on the user not redefining Standard itself in one of
9029 -- the parent units.
9031 if Is_Immediately_Visible
(C
) and then C
/= Standard_Standard
then
9032 Set_Is_Immediately_Visible
(C
, False);
9033 Append_Elmt
(C
, Hidden_Entities
);
9036 end Hide_Current_Scope
;
9042 procedure Init_Env
is
9043 Saved
: Instance_Env
;
9046 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
9047 Saved
.Exchanged_Views
:= Exchanged_Views
;
9048 Saved
.Hidden_Entities
:= Hidden_Entities
;
9049 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
9050 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
9051 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
9053 -- Save configuration switches. These may be reset if the unit is a
9054 -- predefined unit, and the current mode is not Ada 2005.
9056 Saved
.Switches
:= Save_Config_Switches
;
9058 Instance_Envs
.Append
(Saved
);
9060 Exchanged_Views
:= New_Elmt_List
;
9061 Hidden_Entities
:= New_Elmt_List
;
9063 -- Make dummy entry for Instantiated parent. If generic unit is legal,
9064 -- this is set properly in Set_Instance_Env.
9066 Current_Instantiated_Parent
:=
9067 (Current_Scope
, Current_Scope
, Assoc_Null
);
9070 ---------------------
9071 -- In_Main_Context --
9072 ---------------------
9074 function In_Main_Context
(E
: Entity_Id
) return Boolean is
9080 if not Is_Compilation_Unit
(E
)
9081 or else Ekind
(E
) /= E_Package
9082 or else In_Private_Part
(E
)
9087 Context
:= Context_Items
(Cunit
(Main_Unit
));
9089 Clause
:= First
(Context
);
9090 while Present
(Clause
) loop
9091 if Nkind
(Clause
) = N_With_Clause
then
9092 Nam
:= Name
(Clause
);
9094 -- If the current scope is part of the context of the main unit,
9095 -- analysis of the corresponding with_clause is not complete, and
9096 -- the entity is not set. We use the Chars field directly, which
9097 -- might produce false positives in rare cases, but guarantees
9098 -- that we produce all the instance bodies we will need.
9100 if (Is_Entity_Name
(Nam
) and then Chars
(Nam
) = Chars
(E
))
9101 or else (Nkind
(Nam
) = N_Selected_Component
9102 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
9112 end In_Main_Context
;
9114 ---------------------
9115 -- Inherit_Context --
9116 ---------------------
9118 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
9119 Current_Context
: List_Id
;
9120 Current_Unit
: Node_Id
;
9129 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
9131 -- The inherited context is attached to the enclosing compilation
9132 -- unit. This is either the main unit, or the declaration for the
9133 -- main unit (in case the instantiation appears within the package
9134 -- declaration and the main unit is its body).
9136 Current_Unit
:= Parent
(Inst
);
9137 while Present
(Current_Unit
)
9138 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
9140 Current_Unit
:= Parent
(Current_Unit
);
9143 Current_Context
:= Context_Items
(Current_Unit
);
9145 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
9146 while Present
(Item
) loop
9147 if Nkind
(Item
) = N_With_Clause
then
9148 Lib_Unit
:= Library_Unit
(Item
);
9150 -- Take care to prevent direct cyclic with's
9152 if Lib_Unit
/= Current_Unit
then
9154 -- Do not add a unit if it is already in the context
9156 Clause
:= First
(Current_Context
);
9158 while Present
(Clause
) loop
9159 if Nkind
(Clause
) = N_With_Clause
9160 and then Library_Unit
(Clause
) = Lib_Unit
9170 New_I
:= New_Copy
(Item
);
9171 Set_Implicit_With
(New_I
);
9173 Append
(New_I
, Current_Context
);
9181 end Inherit_Context
;
9187 procedure Initialize
is
9189 Generic_Renamings
.Init
;
9192 Generic_Renamings_HTable
.Reset
;
9193 Circularity_Detected
:= False;
9194 Exchanged_Views
:= No_Elist
;
9195 Hidden_Entities
:= No_Elist
;
9198 -------------------------------------
9199 -- Insert_Freeze_Node_For_Instance --
9200 -------------------------------------
9202 procedure Insert_Freeze_Node_For_Instance
9211 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
9212 -- Find enclosing package or subprogram body, if any. Freeze node may
9213 -- be placed at end of current declarative list if previous instance
9214 -- and current one have different enclosing bodies.
9216 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
;
9217 -- Find the local instance, if any, that declares the generic that is
9218 -- being instantiated. If present, the freeze node for this instance
9219 -- must follow the freeze node for the previous instance.
9221 --------------------
9222 -- Enclosing_Body --
9223 --------------------
9225 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
9231 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
9233 if Nkind_In
(P
, N_Package_Body
, N_Subprogram_Body
) then
9234 if Nkind
(Parent
(P
)) = N_Subunit
then
9235 return Corresponding_Stub
(Parent
(P
));
9241 P
:= True_Parent
(P
);
9247 -----------------------
9248 -- Previous_Instance --
9249 -----------------------
9251 function Previous_Instance
(Gen
: Entity_Id
) return Entity_Id
is
9256 while Present
(S
) and then S
/= Standard_Standard
loop
9257 if Is_Generic_Instance
(S
)
9258 and then In_Same_Source_Unit
(S
, N
)
9267 end Previous_Instance
;
9269 -- Start of processing for Insert_Freeze_Node_For_Instance
9272 if not Is_List_Member
(F_Node
) then
9274 Decls
:= List_Containing
(N
);
9275 Inst
:= Entity
(F_Node
);
9276 Par_N
:= Parent
(Decls
);
9278 -- When processing a subprogram instantiation, utilize the actual
9279 -- subprogram instantiation rather than its package wrapper as it
9280 -- carries all the context information.
9282 if Is_Wrapper_Package
(Inst
) then
9283 Inst
:= Related_Instance
(Inst
);
9286 -- If this is a package instance, check whether the generic is
9287 -- declared in a previous instance and the current instance is
9288 -- not within the previous one.
9290 if Present
(Generic_Parent
(Parent
(Inst
)))
9291 and then Is_In_Main_Unit
(N
)
9294 Enclosing_N
: constant Node_Id
:= Enclosing_Body
(N
);
9295 Par_I
: constant Entity_Id
:=
9297 (Generic_Parent
(Parent
(Inst
)));
9302 and then Earlier
(N
, Freeze_Node
(Par_I
))
9304 Scop
:= Scope
(Inst
);
9306 -- If the current instance is within the one that contains
9307 -- the generic, the freeze node for the current one must
9308 -- appear in the current declarative part. Ditto, if the
9309 -- current instance is within another package instance or
9310 -- within a body that does not enclose the current instance.
9311 -- In these three cases the freeze node of the previous
9312 -- instance is not relevant.
9314 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
9315 exit when Scop
= Par_I
9317 (Is_Generic_Instance
(Scop
)
9318 and then Scope_Depth
(Scop
) > Scope_Depth
(Par_I
));
9319 Scop
:= Scope
(Scop
);
9322 -- Previous instance encloses current instance
9324 if Scop
= Par_I
then
9327 -- If the next node is a source body we must freeze in
9328 -- the current scope as well.
9330 elsif Present
(Next
(N
))
9331 and then Nkind_In
(Next
(N
), N_Subprogram_Body
,
9333 and then Comes_From_Source
(Next
(N
))
9337 -- Current instance is within an unrelated instance
9339 elsif Is_Generic_Instance
(Scop
) then
9342 -- Current instance is within an unrelated body
9344 elsif Present
(Enclosing_N
)
9345 and then Enclosing_N
/= Enclosing_Body
(Par_I
)
9350 Insert_After
(Freeze_Node
(Par_I
), F_Node
);
9357 -- When the instantiation occurs in a package declaration, append the
9358 -- freeze node to the private declarations (if any).
9360 if Nkind
(Par_N
) = N_Package_Specification
9361 and then Decls
= Visible_Declarations
(Par_N
)
9362 and then Present
(Private_Declarations
(Par_N
))
9363 and then not Is_Empty_List
(Private_Declarations
(Par_N
))
9365 Decls
:= Private_Declarations
(Par_N
);
9366 Decl
:= First
(Decls
);
9369 -- Determine the proper freeze point of a package instantiation. We
9370 -- adhere to the general rule of a package or subprogram body causing
9371 -- freezing of anything before it in the same declarative region. In
9372 -- this case, the proper freeze point of a package instantiation is
9373 -- before the first source body which follows, or before a stub. This
9374 -- ensures that entities coming from the instance are already frozen
9375 -- and usable in source bodies.
9377 if Nkind
(Par_N
) /= N_Package_Declaration
9378 and then Ekind
(Inst
) = E_Package
9379 and then Is_Generic_Instance
(Inst
)
9381 not In_Same_Source_Unit
(Generic_Parent
(Parent
(Inst
)), Inst
)
9383 while Present
(Decl
) loop
9384 if (Nkind
(Decl
) in N_Unit_Body
9386 Nkind
(Decl
) in N_Body_Stub
)
9387 and then Comes_From_Source
(Decl
)
9389 Insert_Before
(Decl
, F_Node
);
9397 -- In a package declaration, or if no previous body, insert at end
9400 Set_Sloc
(F_Node
, Sloc
(Last
(Decls
)));
9401 Insert_After
(Last
(Decls
), F_Node
);
9403 end Insert_Freeze_Node_For_Instance
;
9409 procedure Install_Body
9410 (Act_Body
: Node_Id
;
9415 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean;
9416 -- Check if the generic definition and the instantiation come from
9417 -- a common scope, in which case the instance must be frozen after
9418 -- the generic body.
9420 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
;
9421 -- If the instance is nested inside a generic unit, the Sloc of the
9422 -- instance indicates the place of the original definition, not the
9423 -- point of the current enclosing instance. Pending a better usage of
9424 -- Slocs to indicate instantiation places, we determine the place of
9425 -- origin of a node by finding the maximum sloc of any ancestor node.
9426 -- Why is this not equivalent to Top_Level_Location ???
9432 function In_Same_Scope
(Gen_Id
, Act_Id
: Node_Id
) return Boolean is
9433 Act_Scop
: Entity_Id
:= Scope
(Act_Id
);
9434 Gen_Scop
: Entity_Id
:= Scope
(Gen_Id
);
9437 while Act_Scop
/= Standard_Standard
9438 and then Gen_Scop
/= Standard_Standard
9440 if Act_Scop
= Gen_Scop
then
9444 Act_Scop
:= Scope
(Act_Scop
);
9445 Gen_Scop
:= Scope
(Gen_Scop
);
9455 function True_Sloc
(N
, Act_Unit
: Node_Id
) return Source_Ptr
is
9462 while Present
(N1
) and then N1
/= Act_Unit
loop
9463 if Sloc
(N1
) > Res
then
9473 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
9474 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
9475 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
9476 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
9477 Gen_Unit
: constant Node_Id
:=
9478 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
9480 Body_Unit
: Node_Id
;
9482 Must_Delay
: Boolean;
9483 Orig_Body
: Node_Id
:= Gen_Body
;
9485 -- Start of processing for Install_Body
9488 -- Handle first the case of an instance with incomplete actual types.
9489 -- The instance body cannot be placed after the declaration because
9490 -- full views have not been seen yet. Any use of the non-limited views
9491 -- in the instance body requires the presence of a regular with_clause
9492 -- in the enclosing unit, and will fail if this with_clause is missing.
9493 -- We place the instance body at the beginning of the enclosing body,
9494 -- which is the unit being compiled. The freeze node for the instance
9495 -- is then placed after the instance body.
9497 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Id
))
9498 and then Expander_Active
9499 and then Ekind
(Scope
(Act_Id
)) = E_Package
9502 Scop
: constant Entity_Id
:= Scope
(Act_Id
);
9503 Body_Id
: constant Node_Id
:=
9504 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
9507 Ensure_Freeze_Node
(Act_Id
);
9508 F_Node
:= Freeze_Node
(Act_Id
);
9509 if Present
(Body_Id
) then
9510 Set_Is_Frozen
(Act_Id
, False);
9511 Prepend
(Act_Body
, Declarations
(Parent
(Body_Id
)));
9512 if Is_List_Member
(F_Node
) then
9516 Insert_After
(Act_Body
, F_Node
);
9522 -- If the body is a subunit, the freeze point is the corresponding stub
9523 -- in the current compilation, not the subunit itself.
9525 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
9526 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
9528 Orig_Body
:= Gen_Body
;
9531 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
9533 -- If the instantiation and the generic definition appear in the same
9534 -- package declaration, this is an early instantiation. If they appear
9535 -- in the same declarative part, it is an early instantiation only if
9536 -- the generic body appears textually later, and the generic body is
9537 -- also in the main unit.
9539 -- If instance is nested within a subprogram, and the generic body
9540 -- is not, the instance is delayed because the enclosing body is. If
9541 -- instance and body are within the same scope, or the same subprogram
9542 -- body, indicate explicitly that the instance is delayed.
9545 (Gen_Unit
= Act_Unit
9546 and then (Nkind_In
(Gen_Unit
, N_Generic_Package_Declaration
,
9547 N_Package_Declaration
)
9548 or else (Gen_Unit
= Body_Unit
9549 and then True_Sloc
(N
, Act_Unit
) <
9551 and then Is_In_Main_Unit
(Original_Node
(Gen_Unit
))
9552 and then In_Same_Scope
(Gen_Id
, Act_Id
));
9554 -- If this is an early instantiation, the freeze node is placed after
9555 -- the generic body. Otherwise, if the generic appears in an instance,
9556 -- we cannot freeze the current instance until the outer one is frozen.
9557 -- This is only relevant if the current instance is nested within some
9558 -- inner scope not itself within the outer instance. If this scope is
9559 -- a package body in the same declarative part as the outer instance,
9560 -- then that body needs to be frozen after the outer instance. Finally,
9561 -- if no delay is needed, we place the freeze node at the end of the
9562 -- current declarative part.
9565 and then (No
(Freeze_Node
(Act_Id
))
9566 or else not Is_List_Member
(Freeze_Node
(Act_Id
)))
9568 Ensure_Freeze_Node
(Act_Id
);
9569 F_Node
:= Freeze_Node
(Act_Id
);
9572 Insert_After
(Orig_Body
, F_Node
);
9574 elsif Is_Generic_Instance
(Par
)
9575 and then Present
(Freeze_Node
(Par
))
9576 and then Scope
(Act_Id
) /= Par
9578 -- Freeze instance of inner generic after instance of enclosing
9581 if In_Same_Declarative_Part
(Parent
(Freeze_Node
(Par
)), N
) then
9583 -- Handle the following case:
9585 -- package Parent_Inst is new ...
9588 -- procedure P ... -- this body freezes Parent_Inst
9590 -- package Inst is new ...
9592 -- In this particular scenario, the freeze node for Inst must
9593 -- be inserted in the same manner as that of Parent_Inst,
9594 -- before the next source body or at the end of the declarative
9595 -- list (body not available). If body P did not exist and
9596 -- Parent_Inst was frozen after Inst, either by a body
9597 -- following Inst or at the end of the declarative region,
9598 -- the freeze node for Inst must be inserted after that of
9599 -- Parent_Inst. This relation is established by comparing
9600 -- the Slocs of Parent_Inst freeze node and Inst.
9601 -- We examine the parents of the enclosing lists to handle
9602 -- the case where the parent instance is in the visible part
9603 -- of a package declaration, and the inner instance is in
9604 -- the corresponding private part.
9606 if Parent
(List_Containing
(Get_Unit_Instantiation_Node
(Par
)))
9607 = Parent
(List_Containing
(N
))
9608 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(N
)
9610 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9612 Insert_After
(Freeze_Node
(Par
), F_Node
);
9615 -- Freeze package enclosing instance of inner generic after
9616 -- instance of enclosing generic.
9618 elsif Nkind_In
(Parent
(N
), N_Package_Body
, N_Subprogram_Body
)
9619 and then In_Same_Declarative_Part
9620 (Parent
(Freeze_Node
(Par
)), Parent
(N
))
9623 Enclosing
: Entity_Id
;
9626 Enclosing
:= Corresponding_Spec
(Parent
(N
));
9628 if No
(Enclosing
) then
9629 Enclosing
:= Defining_Entity
(Parent
(N
));
9632 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9633 Ensure_Freeze_Node
(Enclosing
);
9635 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
9637 -- The enclosing context is a subunit, insert the freeze
9638 -- node after the stub.
9640 if Nkind
(Parent
(Parent
(N
))) = N_Subunit
then
9641 Insert_Freeze_Node_For_Instance
9642 (Corresponding_Stub
(Parent
(Parent
(N
))),
9643 Freeze_Node
(Enclosing
));
9645 -- The enclosing context is a package with a stub body
9646 -- which has already been replaced by the real body.
9647 -- Insert the freeze node after the actual body.
9649 elsif Ekind
(Enclosing
) = E_Package
9650 and then Present
(Body_Entity
(Enclosing
))
9651 and then Was_Originally_Stub
9652 (Parent
(Body_Entity
(Enclosing
)))
9654 Insert_Freeze_Node_For_Instance
9655 (Parent
(Body_Entity
(Enclosing
)),
9656 Freeze_Node
(Enclosing
));
9658 -- The parent instance has been frozen before the body of
9659 -- the enclosing package, insert the freeze node after
9662 elsif List_Containing
(Freeze_Node
(Par
)) =
9663 List_Containing
(Parent
(N
))
9664 and then Sloc
(Freeze_Node
(Par
)) < Sloc
(Parent
(N
))
9666 Insert_Freeze_Node_For_Instance
9667 (Parent
(N
), Freeze_Node
(Enclosing
));
9671 (Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
9677 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9681 Insert_Freeze_Node_For_Instance
(N
, F_Node
);
9685 Set_Is_Frozen
(Act_Id
);
9686 Insert_Before
(N
, Act_Body
);
9687 Mark_Rewrite_Insertion
(Act_Body
);
9690 -----------------------------
9691 -- Install_Formal_Packages --
9692 -----------------------------
9694 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
9697 Gen_E
: Entity_Id
:= Empty
;
9700 E
:= First_Entity
(Par
);
9702 -- If we are installing an instance parent, locate the formal packages
9703 -- of its generic parent.
9705 if Is_Generic_Instance
(Par
) then
9706 Gen
:= Generic_Parent
(Package_Specification
(Par
));
9707 Gen_E
:= First_Entity
(Gen
);
9710 while Present
(E
) loop
9711 if Ekind
(E
) = E_Package
9712 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
9714 -- If this is the renaming for the parent instance, done
9716 if Renamed_Object
(E
) = Par
then
9719 -- The visibility of a formal of an enclosing generic is already
9722 elsif Denotes_Formal_Package
(E
) then
9725 elsif Present
(Associated_Formal_Package
(E
)) then
9726 Check_Generic_Actuals
(Renamed_Object
(E
), True);
9727 Set_Is_Hidden
(E
, False);
9729 -- Find formal package in generic unit that corresponds to
9730 -- (instance of) formal package in instance.
9732 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
9733 Next_Entity
(Gen_E
);
9736 if Present
(Gen_E
) then
9737 Map_Formal_Package_Entities
(Gen_E
, E
);
9744 if Present
(Gen_E
) then
9745 Next_Entity
(Gen_E
);
9748 end Install_Formal_Packages
;
9750 --------------------
9751 -- Install_Parent --
9752 --------------------
9754 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
9755 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
9756 S
: constant Entity_Id
:= Current_Scope
;
9757 Inst_Par
: Entity_Id
;
9758 First_Par
: Entity_Id
;
9759 Inst_Node
: Node_Id
;
9760 Gen_Par
: Entity_Id
;
9761 First_Gen
: Entity_Id
;
9764 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
9765 -- Install the scopes of noninstance parent units ending with Par
9767 procedure Install_Spec
(Par
: Entity_Id
);
9768 -- The child unit is within the declarative part of the parent, so the
9769 -- declarations within the parent are immediately visible.
9771 -------------------------------
9772 -- Install_Noninstance_Specs --
9773 -------------------------------
9775 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
9778 and then Par
/= Standard_Standard
9779 and then not In_Open_Scopes
(Par
)
9781 Install_Noninstance_Specs
(Scope
(Par
));
9784 end Install_Noninstance_Specs
;
9790 procedure Install_Spec
(Par
: Entity_Id
) is
9791 Spec
: constant Node_Id
:= Package_Specification
(Par
);
9794 -- If this parent of the child instance is a top-level unit,
9795 -- then record the unit and its visibility for later resetting in
9796 -- Remove_Parent. We exclude units that are generic instances, as we
9797 -- only want to record this information for the ultimate top-level
9798 -- noninstance parent (is that always correct???).
9800 if Scope
(Par
) = Standard_Standard
9801 and then not Is_Generic_Instance
(Par
)
9803 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
9804 Instance_Parent_Unit
:= Par
;
9807 -- Open the parent scope and make it and its declarations visible.
9808 -- If this point is not within a body, then only the visible
9809 -- declarations should be made visible, and installation of the
9810 -- private declarations is deferred until the appropriate point
9811 -- within analysis of the spec being instantiated (see the handling
9812 -- of parent visibility in Analyze_Package_Specification). This is
9813 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
9814 -- private view problems that occur when compiling instantiations of
9815 -- a generic child of that package (Generic_Dispatching_Constructor).
9816 -- If the instance freezes a tagged type, inlinings of operations
9817 -- from Ada.Tags may need the full view of type Tag. If inlining took
9818 -- proper account of establishing visibility of inlined subprograms'
9819 -- parents then it should be possible to remove this
9820 -- special check. ???
9823 Set_Is_Immediately_Visible
(Par
);
9824 Install_Visible_Declarations
(Par
);
9825 Set_Use
(Visible_Declarations
(Spec
));
9827 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
9828 Install_Private_Declarations
(Par
);
9829 Set_Use
(Private_Declarations
(Spec
));
9833 -- Start of processing for Install_Parent
9836 -- We need to install the parent instance to compile the instantiation
9837 -- of the child, but the child instance must appear in the current
9838 -- scope. Given that we cannot place the parent above the current scope
9839 -- in the scope stack, we duplicate the current scope and unstack both
9840 -- after the instantiation is complete.
9842 -- If the parent is itself the instantiation of a child unit, we must
9843 -- also stack the instantiation of its parent, and so on. Each such
9844 -- ancestor is the prefix of the name in a prior instantiation.
9846 -- If this is a nested instance, the parent unit itself resolves to
9847 -- a renaming of the parent instance, whose declaration we need.
9849 -- Finally, the parent may be a generic (not an instance) when the
9850 -- child unit appears as a formal package.
9854 if Present
(Renamed_Entity
(Inst_Par
)) then
9855 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9858 First_Par
:= Inst_Par
;
9860 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9862 First_Gen
:= Gen_Par
;
9864 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
9866 -- Load grandparent instance as well
9868 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
9870 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
9871 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
9873 if Present
(Renamed_Entity
(Inst_Par
)) then
9874 Inst_Par
:= Renamed_Entity
(Inst_Par
);
9877 Gen_Par
:= Generic_Parent
(Package_Specification
(Inst_Par
));
9879 if Present
(Gen_Par
) then
9880 Prepend_Elmt
(Inst_Par
, Ancestors
);
9883 -- Parent is not the name of an instantiation
9885 Install_Noninstance_Specs
(Inst_Par
);
9896 if Present
(First_Gen
) then
9897 Append_Elmt
(First_Par
, Ancestors
);
9899 Install_Noninstance_Specs
(First_Par
);
9902 if not Is_Empty_Elmt_List
(Ancestors
) then
9903 Elmt
:= First_Elmt
(Ancestors
);
9904 while Present
(Elmt
) loop
9905 Install_Spec
(Node
(Elmt
));
9906 Install_Formal_Packages
(Node
(Elmt
));
9916 -------------------------------
9917 -- Install_Hidden_Primitives --
9918 -------------------------------
9920 procedure Install_Hidden_Primitives
9921 (Prims_List
: in out Elist_Id
;
9926 List
: Elist_Id
:= No_Elist
;
9927 Prim_G_Elmt
: Elmt_Id
;
9928 Prim_A_Elmt
: Elmt_Id
;
9933 -- No action needed in case of serious errors because we cannot trust
9934 -- in the order of primitives
9936 if Serious_Errors_Detected
> 0 then
9939 -- No action possible if we don't have available the list of primitive
9943 or else not Is_Record_Type
(Gen_T
)
9944 or else not Is_Tagged_Type
(Gen_T
)
9945 or else not Is_Record_Type
(Act_T
)
9946 or else not Is_Tagged_Type
(Act_T
)
9950 -- There is no need to handle interface types since their primitives
9953 elsif Is_Interface
(Gen_T
) then
9957 Prim_G_Elmt
:= First_Elmt
(Primitive_Operations
(Gen_T
));
9959 if not Is_Class_Wide_Type
(Act_T
) then
9960 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Act_T
));
9962 Prim_A_Elmt
:= First_Elmt
(Primitive_Operations
(Root_Type
(Act_T
)));
9966 -- Skip predefined primitives in the generic formal
9968 while Present
(Prim_G_Elmt
)
9969 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_G_Elmt
))
9971 Next_Elmt
(Prim_G_Elmt
);
9974 -- Skip predefined primitives in the generic actual
9976 while Present
(Prim_A_Elmt
)
9977 and then Is_Predefined_Dispatching_Operation
(Node
(Prim_A_Elmt
))
9979 Next_Elmt
(Prim_A_Elmt
);
9982 exit when No
(Prim_G_Elmt
) or else No
(Prim_A_Elmt
);
9984 Prim_G
:= Node
(Prim_G_Elmt
);
9985 Prim_A
:= Node
(Prim_A_Elmt
);
9987 -- There is no need to handle interface primitives because their
9988 -- primitives are not hidden
9990 exit when Present
(Interface_Alias
(Prim_G
));
9992 -- Here we install one hidden primitive
9994 if Chars
(Prim_G
) /= Chars
(Prim_A
)
9995 and then Has_Suffix
(Prim_A
, 'P')
9996 and then Remove_Suffix
(Prim_A
, 'P') = Chars
(Prim_G
)
9998 Set_Chars
(Prim_A
, Chars
(Prim_G
));
9999 Append_New_Elmt
(Prim_A
, To
=> List
);
10002 Next_Elmt
(Prim_A_Elmt
);
10003 Next_Elmt
(Prim_G_Elmt
);
10006 -- Append the elements to the list of temporarily visible primitives
10007 -- avoiding duplicates.
10009 if Present
(List
) then
10010 if No
(Prims_List
) then
10011 Prims_List
:= New_Elmt_List
;
10014 Elmt
:= First_Elmt
(List
);
10015 while Present
(Elmt
) loop
10016 Append_Unique_Elmt
(Node
(Elmt
), Prims_List
);
10020 end Install_Hidden_Primitives
;
10022 -------------------------------
10023 -- Restore_Hidden_Primitives --
10024 -------------------------------
10026 procedure Restore_Hidden_Primitives
(Prims_List
: in out Elist_Id
) is
10027 Prim_Elmt
: Elmt_Id
;
10031 if Prims_List
/= No_Elist
then
10032 Prim_Elmt
:= First_Elmt
(Prims_List
);
10033 while Present
(Prim_Elmt
) loop
10034 Prim
:= Node
(Prim_Elmt
);
10035 Set_Chars
(Prim
, Add_Suffix
(Prim
, 'P'));
10036 Next_Elmt
(Prim_Elmt
);
10039 Prims_List
:= No_Elist
;
10041 end Restore_Hidden_Primitives
;
10043 --------------------------------
10044 -- Instantiate_Formal_Package --
10045 --------------------------------
10047 function Instantiate_Formal_Package
10050 Analyzed_Formal
: Node_Id
) return List_Id
10052 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10053 Hidden_Formals
: constant Elist_Id
:= New_Elmt_List
;
10054 Actual_Pack
: Entity_Id
;
10055 Formal_Pack
: Entity_Id
;
10056 Gen_Parent
: Entity_Id
;
10059 Parent_Spec
: Node_Id
;
10061 procedure Find_Matching_Actual
10063 Act
: in out Entity_Id
);
10064 -- We need to associate each formal entity in the formal package with
10065 -- the corresponding entity in the actual package. The actual package
10066 -- has been analyzed and possibly expanded, and as a result there is
10067 -- no one-to-one correspondence between the two lists (for example,
10068 -- the actual may include subtypes, itypes, and inherited primitive
10069 -- operations, interspersed among the renaming declarations for the
10070 -- actuals). We retrieve the corresponding actual by name because each
10071 -- actual has the same name as the formal, and they do appear in the
10074 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
10075 -- Retrieve entity of defining entity of generic formal parameter.
10076 -- Only the declarations of formals need to be considered when
10077 -- linking them to actuals, but the declarative list may include
10078 -- internal entities generated during analysis, and those are ignored.
10080 procedure Match_Formal_Entity
10081 (Formal_Node
: Node_Id
;
10082 Formal_Ent
: Entity_Id
;
10083 Actual_Ent
: Entity_Id
);
10084 -- Associates the formal entity with the actual. In the case where
10085 -- Formal_Ent is a formal package, this procedure iterates through all
10086 -- of its formals and enters associations between the actuals occurring
10087 -- in the formal package's corresponding actual package (given by
10088 -- Actual_Ent) and the formal package's formal parameters. This
10089 -- procedure recurses if any of the parameters is itself a package.
10091 function Is_Instance_Of
10092 (Act_Spec
: Entity_Id
;
10093 Gen_Anc
: Entity_Id
) return Boolean;
10094 -- The actual can be an instantiation of a generic within another
10095 -- instance, in which case there is no direct link from it to the
10096 -- original generic ancestor. In that case, we recognize that the
10097 -- ultimate ancestor is the same by examining names and scopes.
10099 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
10100 -- If the current formal is declared with a box, its own formals are
10101 -- visible in the instance, as they were in the generic, and their
10102 -- Hidden flag must be reset. If some of these formals are themselves
10103 -- packages declared with a box, the processing must be recursive.
10105 --------------------------
10106 -- Find_Matching_Actual --
10107 --------------------------
10109 procedure Find_Matching_Actual
10111 Act
: in out Entity_Id
)
10113 Formal_Ent
: Entity_Id
;
10116 case Nkind
(Original_Node
(F
)) is
10117 when N_Formal_Object_Declaration
10118 | N_Formal_Type_Declaration
10120 Formal_Ent
:= Defining_Identifier
(F
);
10122 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
10126 when N_Formal_Package_Declaration
10127 | N_Formal_Subprogram_Declaration
10128 | N_Generic_Package_Declaration
10129 | N_Package_Declaration
10131 Formal_Ent
:= Defining_Entity
(F
);
10133 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
10138 raise Program_Error
;
10140 end Find_Matching_Actual
;
10142 -------------------------
10143 -- Match_Formal_Entity --
10144 -------------------------
10146 procedure Match_Formal_Entity
10147 (Formal_Node
: Node_Id
;
10148 Formal_Ent
: Entity_Id
;
10149 Actual_Ent
: Entity_Id
)
10151 Act_Pkg
: Entity_Id
;
10154 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
10156 if Ekind
(Actual_Ent
) = E_Package
then
10158 -- Record associations for each parameter
10160 Act_Pkg
:= Actual_Ent
;
10163 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
10167 Gen_Decl
: Node_Id
;
10169 Actual
: Entity_Id
;
10172 -- Retrieve the actual given in the formal package declaration
10174 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
10176 -- The actual in the formal package declaration may be a
10177 -- renamed generic package, in which case we want to retrieve
10178 -- the original generic in order to traverse its formal part.
10180 if Present
(Renamed_Entity
(Actual
)) then
10181 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
10183 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
10186 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
10188 if Present
(Formals
) then
10189 F_Node
:= First_Non_Pragma
(Formals
);
10194 while Present
(A_Ent
)
10195 and then Present
(F_Node
)
10196 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
10198 F_Ent
:= Get_Formal_Entity
(F_Node
);
10200 if Present
(F_Ent
) then
10202 -- This is a formal of the original package. Record
10203 -- association and recurse.
10205 Find_Matching_Actual
(F_Node
, A_Ent
);
10206 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
10207 Next_Entity
(A_Ent
);
10210 Next_Non_Pragma
(F_Node
);
10214 end Match_Formal_Entity
;
10216 -----------------------
10217 -- Get_Formal_Entity --
10218 -----------------------
10220 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
10221 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
10224 when N_Formal_Object_Declaration
=>
10225 return Defining_Identifier
(N
);
10227 when N_Formal_Type_Declaration
=>
10228 return Defining_Identifier
(N
);
10230 when N_Formal_Subprogram_Declaration
=>
10231 return Defining_Unit_Name
(Specification
(N
));
10233 when N_Formal_Package_Declaration
=>
10234 return Defining_Identifier
(Original_Node
(N
));
10236 when N_Generic_Package_Declaration
=>
10237 return Defining_Identifier
(Original_Node
(N
));
10239 -- All other declarations are introduced by semantic analysis and
10240 -- have no match in the actual.
10245 end Get_Formal_Entity
;
10247 --------------------
10248 -- Is_Instance_Of --
10249 --------------------
10251 function Is_Instance_Of
10252 (Act_Spec
: Entity_Id
;
10253 Gen_Anc
: Entity_Id
) return Boolean
10255 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
10258 if No
(Gen_Par
) then
10261 -- Simplest case: the generic parent of the actual is the formal
10263 elsif Gen_Par
= Gen_Anc
then
10266 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
10269 -- The actual may be obtained through several instantiations. Its
10270 -- scope must itself be an instance of a generic declared in the
10271 -- same scope as the formal. Any other case is detected above.
10273 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
10277 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
10279 end Is_Instance_Of
;
10281 ---------------------------
10282 -- Process_Nested_Formal --
10283 ---------------------------
10285 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
10289 if Present
(Associated_Formal_Package
(Formal
))
10290 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
10292 Ent
:= First_Entity
(Formal
);
10293 while Present
(Ent
) loop
10294 Set_Is_Hidden
(Ent
, False);
10295 Set_Is_Visible_Formal
(Ent
);
10296 Set_Is_Potentially_Use_Visible
10297 (Ent
, Is_Potentially_Use_Visible
(Formal
));
10299 if Ekind
(Ent
) = E_Package
then
10300 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
10301 Process_Nested_Formal
(Ent
);
10307 end Process_Nested_Formal
;
10309 -- Start of processing for Instantiate_Formal_Package
10314 -- The actual must be a package instance, or else a current instance
10315 -- such as a parent generic within the body of a generic child.
10317 if not Is_Entity_Name
(Actual
)
10318 or else not Ekind_In
(Entity
(Actual
), E_Generic_Package
, E_Package
)
10321 ("expect package instance to instantiate formal", Actual
);
10322 Abandon_Instantiation
(Actual
);
10323 raise Program_Error
;
10326 Actual_Pack
:= Entity
(Actual
);
10327 Set_Is_Instantiated
(Actual_Pack
);
10329 -- The actual may be a renamed package, or an outer generic formal
10330 -- package whose instantiation is converted into a renaming.
10332 if Present
(Renamed_Object
(Actual_Pack
)) then
10333 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
10336 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
10337 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
10338 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
10341 Generic_Parent
(Specification
(Analyzed_Formal
));
10343 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10346 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
10347 Parent_Spec
:= Package_Specification
(Actual_Pack
);
10349 Parent_Spec
:= Parent
(Actual_Pack
);
10352 if Gen_Parent
= Any_Id
then
10354 ("previous error in declaration of formal package", Actual
);
10355 Abandon_Instantiation
(Actual
);
10357 elsif Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
)) then
10360 -- If this is the current instance of an enclosing generic, that unit
10361 -- is the generic package we need.
10363 elsif In_Open_Scopes
(Actual_Pack
)
10364 and then Ekind
(Actual_Pack
) = E_Generic_Package
10370 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
10371 Abandon_Instantiation
(Actual
);
10374 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
10375 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
10378 Make_Package_Renaming_Declaration
(Loc
,
10379 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
10380 Name
=> New_Occurrence_Of
(Actual_Pack
, Loc
));
10382 Set_Associated_Formal_Package
10383 (Defining_Unit_Name
(Nod
), Defining_Identifier
(Formal
));
10384 Decls
:= New_List
(Nod
);
10386 -- If the formal F has a box, then the generic declarations are
10387 -- visible in the generic G. In an instance of G, the corresponding
10388 -- entities in the actual for F (which are the actuals for the
10389 -- instantiation of the generic that F denotes) must also be made
10390 -- visible for analysis of the current instance. On exit from the
10391 -- current instance, those entities are made private again. If the
10392 -- actual is currently in use, these entities are also use-visible.
10394 -- The loop through the actual entities also steps through the formal
10395 -- entities and enters associations from formals to actuals into the
10396 -- renaming map. This is necessary to properly handle checking of
10397 -- actual parameter associations for later formals that depend on
10398 -- actuals declared in the formal package.
10400 -- In Ada 2005, partial parameterization requires that we make
10401 -- visible the actuals corresponding to formals that were defaulted
10402 -- in the formal package. There formals are identified because they
10403 -- remain formal generics within the formal package, rather than
10404 -- being renamings of the actuals supplied.
10407 Gen_Decl
: constant Node_Id
:=
10408 Unit_Declaration_Node
(Gen_Parent
);
10409 Formals
: constant List_Id
:=
10410 Generic_Formal_Declarations
(Gen_Decl
);
10412 Actual_Ent
: Entity_Id
;
10413 Actual_Of_Formal
: Node_Id
;
10414 Formal_Node
: Node_Id
;
10415 Formal_Ent
: Entity_Id
;
10418 if Present
(Formals
) then
10419 Formal_Node
:= First_Non_Pragma
(Formals
);
10421 Formal_Node
:= Empty
;
10424 Actual_Ent
:= First_Entity
(Actual_Pack
);
10425 Actual_Of_Formal
:=
10426 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
10427 while Present
(Actual_Ent
)
10428 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10430 if Present
(Formal_Node
) then
10431 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
10433 if Present
(Formal_Ent
) then
10434 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
10435 Match_Formal_Entity
(Formal_Node
, Formal_Ent
, Actual_Ent
);
10437 -- We iterate at the same time over the actuals of the
10438 -- local package created for the formal, to determine
10439 -- which one of the formals of the original generic were
10440 -- defaulted in the formal. The corresponding actual
10441 -- entities are visible in the enclosing instance.
10443 if Box_Present
(Formal
)
10445 (Present
(Actual_Of_Formal
)
10448 (Get_Formal_Entity
(Actual_Of_Formal
)))
10450 Set_Is_Hidden
(Actual_Ent
, False);
10451 Set_Is_Visible_Formal
(Actual_Ent
);
10452 Set_Is_Potentially_Use_Visible
10453 (Actual_Ent
, In_Use
(Actual_Pack
));
10455 if Ekind
(Actual_Ent
) = E_Package
then
10456 Process_Nested_Formal
(Actual_Ent
);
10460 if not Is_Hidden
(Actual_Ent
) then
10461 Append_Elmt
(Actual_Ent
, Hidden_Formals
);
10464 Set_Is_Hidden
(Actual_Ent
);
10465 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
10469 Next_Non_Pragma
(Formal_Node
);
10470 Next
(Actual_Of_Formal
);
10473 -- No further formals to match, but the generic part may
10474 -- contain inherited operation that are not hidden in the
10475 -- enclosing instance.
10477 Next_Entity
(Actual_Ent
);
10481 -- Inherited subprograms generated by formal derived types are
10482 -- also visible if the types are.
10484 Actual_Ent
:= First_Entity
(Actual_Pack
);
10485 while Present
(Actual_Ent
)
10486 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
10488 if Is_Overloadable
(Actual_Ent
)
10490 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
10492 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
10494 Set_Is_Hidden
(Actual_Ent
, False);
10495 Set_Is_Potentially_Use_Visible
10496 (Actual_Ent
, In_Use
(Actual_Pack
));
10499 Next_Entity
(Actual_Ent
);
10502 -- No conformance to check if the generic has no formal parameters
10503 -- and the formal package has no generic associations.
10505 if Is_Empty_List
(Formals
)
10507 (Box_Present
(Formal
)
10508 or else No
(Generic_Associations
(Formal
)))
10514 -- If the formal is not declared with a box, reanalyze it as an
10515 -- abbreviated instantiation, to verify the matching rules of 12.7.
10516 -- The actual checks are performed after the generic associations
10517 -- have been analyzed, to guarantee the same visibility for this
10518 -- instantiation and for the actuals.
10520 -- In Ada 2005, the generic associations for the formal can include
10521 -- defaulted parameters. These are ignored during check. This
10522 -- internal instantiation is removed from the tree after conformance
10523 -- checking, because it contains formal declarations for those
10524 -- defaulted parameters, and those should not reach the back-end.
10526 if not Box_Present
(Formal
) then
10528 I_Pack
: constant Entity_Id
:=
10529 Make_Temporary
(Sloc
(Actual
), 'P');
10532 Set_Is_Internal
(I_Pack
);
10533 Set_Ekind
(I_Pack
, E_Package
);
10534 Set_Hidden_In_Formal_Instance
(I_Pack
, Hidden_Formals
);
10537 Make_Package_Instantiation
(Sloc
(Actual
),
10538 Defining_Unit_Name
=> I_Pack
,
10541 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
10542 Generic_Associations
=> Generic_Associations
(Formal
)));
10548 end Instantiate_Formal_Package
;
10550 -----------------------------------
10551 -- Instantiate_Formal_Subprogram --
10552 -----------------------------------
10554 function Instantiate_Formal_Subprogram
10557 Analyzed_Formal
: Node_Id
) return Node_Id
10559 Analyzed_S
: constant Entity_Id
:=
10560 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
10561 Formal_Sub
: constant Entity_Id
:=
10562 Defining_Unit_Name
(Specification
(Formal
));
10564 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
10565 -- If the generic is a child unit, the parent has been installed on the
10566 -- scope stack, but a default subprogram cannot resolve to something
10567 -- on the parent because that parent is not really part of the visible
10568 -- context (it is there to resolve explicit local entities). If the
10569 -- default has resolved in this way, we remove the entity from immediate
10570 -- visibility and analyze the node again to emit an error message or
10571 -- find another visible candidate.
10573 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
10574 -- Perform legality check and raise exception on failure
10576 -----------------------
10577 -- From_Parent_Scope --
10578 -----------------------
10580 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
10581 Gen_Scope
: Node_Id
;
10584 Gen_Scope
:= Scope
(Analyzed_S
);
10585 while Present
(Gen_Scope
) and then Is_Child_Unit
(Gen_Scope
) loop
10586 if Scope
(Subp
) = Scope
(Gen_Scope
) then
10590 Gen_Scope
:= Scope
(Gen_Scope
);
10594 end From_Parent_Scope
;
10596 -----------------------------
10597 -- Valid_Actual_Subprogram --
10598 -----------------------------
10600 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
10604 if Is_Entity_Name
(Act
) then
10605 Act_E
:= Entity
(Act
);
10607 elsif Nkind
(Act
) = N_Selected_Component
10608 and then Is_Entity_Name
(Selector_Name
(Act
))
10610 Act_E
:= Entity
(Selector_Name
(Act
));
10616 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
10617 or else Nkind_In
(Act
, N_Attribute_Reference
,
10618 N_Indexed_Component
,
10619 N_Character_Literal
,
10620 N_Explicit_Dereference
)
10626 ("expect subprogram or entry name in instantiation of &",
10627 Instantiation_Node
, Formal_Sub
);
10628 Abandon_Instantiation
(Instantiation_Node
);
10629 end Valid_Actual_Subprogram
;
10633 Decl_Node
: Node_Id
;
10636 New_Spec
: Node_Id
;
10637 New_Subp
: Entity_Id
;
10639 -- Start of processing for Instantiate_Formal_Subprogram
10642 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
10644 -- The tree copy has created the proper instantiation sloc for the
10645 -- new specification. Use this location for all other constructed
10648 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
10650 -- Create new entity for the actual (New_Copy_Tree does not), and
10651 -- indicate that it is an actual.
10653 New_Subp
:= Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
));
10654 Set_Ekind
(New_Subp
, Ekind
(Analyzed_S
));
10655 Set_Is_Generic_Actual_Subprogram
(New_Subp
);
10656 Set_Defining_Unit_Name
(New_Spec
, New_Subp
);
10658 -- Create new entities for the each of the formals in the specification
10659 -- of the renaming declaration built for the actual.
10661 if Present
(Parameter_Specifications
(New_Spec
)) then
10667 F
:= First
(Parameter_Specifications
(New_Spec
));
10668 while Present
(F
) loop
10669 F_Id
:= Defining_Identifier
(F
);
10671 Set_Defining_Identifier
(F
,
10672 Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
)));
10678 -- Find entity of actual. If the actual is an attribute reference, it
10679 -- cannot be resolved here (its formal is missing) but is handled
10680 -- instead in Attribute_Renaming. If the actual is overloaded, it is
10681 -- fully resolved subsequently, when the renaming declaration for the
10682 -- formal is analyzed. If it is an explicit dereference, resolve the
10683 -- prefix but not the actual itself, to prevent interpretation as call.
10685 if Present
(Actual
) then
10686 Loc
:= Sloc
(Actual
);
10687 Set_Sloc
(New_Spec
, Loc
);
10689 if Nkind
(Actual
) = N_Operator_Symbol
then
10690 Find_Direct_Name
(Actual
);
10692 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
10693 Analyze
(Prefix
(Actual
));
10695 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
10699 Valid_Actual_Subprogram
(Actual
);
10702 elsif Present
(Default_Name
(Formal
)) then
10703 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
10704 N_Selected_Component
,
10705 N_Indexed_Component
,
10706 N_Character_Literal
)
10707 and then Present
(Entity
(Default_Name
(Formal
)))
10709 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
10711 Nam
:= New_Copy
(Default_Name
(Formal
));
10712 Set_Sloc
(Nam
, Loc
);
10715 elsif Box_Present
(Formal
) then
10717 -- Actual is resolved at the point of instantiation. Create an
10718 -- identifier or operator with the same name as the formal.
10720 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
10722 Make_Operator_Symbol
(Loc
,
10723 Chars
=> Chars
(Formal_Sub
),
10724 Strval
=> No_String
);
10726 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
10729 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
10730 and then Null_Present
(Specification
(Formal
))
10732 -- Generate null body for procedure, for use in the instance
10735 Make_Subprogram_Body
(Loc
,
10736 Specification
=> New_Spec
,
10737 Declarations
=> New_List
,
10738 Handled_Statement_Sequence
=>
10739 Make_Handled_Sequence_Of_Statements
(Loc
,
10740 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
10742 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
10746 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
10748 ("missing actual&", Instantiation_Node
, Formal_Sub
);
10750 ("\in instantiation of & declared#",
10751 Instantiation_Node
, Scope
(Analyzed_S
));
10752 Abandon_Instantiation
(Instantiation_Node
);
10756 Make_Subprogram_Renaming_Declaration
(Loc
,
10757 Specification
=> New_Spec
,
10760 -- If we do not have an actual and the formal specified <> then set to
10761 -- get proper default.
10763 if No
(Actual
) and then Box_Present
(Formal
) then
10764 Set_From_Default
(Decl_Node
);
10767 -- Gather possible interpretations for the actual before analyzing the
10768 -- instance. If overloaded, it will be resolved when analyzing the
10769 -- renaming declaration.
10771 if Box_Present
(Formal
) and then No
(Actual
) then
10774 if Is_Child_Unit
(Scope
(Analyzed_S
))
10775 and then Present
(Entity
(Nam
))
10777 if not Is_Overloaded
(Nam
) then
10778 if From_Parent_Scope
(Entity
(Nam
)) then
10779 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
10780 Set_Entity
(Nam
, Empty
);
10781 Set_Etype
(Nam
, Empty
);
10784 Set_Is_Immediately_Visible
(Entity
(Nam
));
10793 Get_First_Interp
(Nam
, I
, It
);
10794 while Present
(It
.Nam
) loop
10795 if From_Parent_Scope
(It
.Nam
) then
10799 Get_Next_Interp
(I
, It
);
10806 -- The generic instantiation freezes the actual. This can only be done
10807 -- once the actual is resolved, in the analysis of the renaming
10808 -- declaration. To make the formal subprogram entity available, we set
10809 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
10810 -- This is also needed in Analyze_Subprogram_Renaming for the processing
10811 -- of formal abstract subprograms.
10813 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
10815 -- We cannot analyze the renaming declaration, and thus find the actual,
10816 -- until all the actuals are assembled in the instance. For subsequent
10817 -- checks of other actuals, indicate the node that will hold the
10818 -- instance of this formal.
10820 Set_Instance_Of
(Analyzed_S
, Nam
);
10822 if Nkind
(Actual
) = N_Selected_Component
10823 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
10824 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
10826 -- The renaming declaration will create a body, which must appear
10827 -- outside of the instantiation, We move the renaming declaration
10828 -- out of the instance, and create an additional renaming inside,
10829 -- to prevent freezing anomalies.
10832 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
10835 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
10836 Insert_Before
(Instantiation_Node
, Decl_Node
);
10837 Analyze
(Decl_Node
);
10839 -- Now create renaming within the instance
10842 Make_Subprogram_Renaming_Declaration
(Loc
,
10843 Specification
=> New_Copy_Tree
(New_Spec
),
10844 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
10846 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
10847 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
10852 end Instantiate_Formal_Subprogram
;
10854 ------------------------
10855 -- Instantiate_Object --
10856 ------------------------
10858 function Instantiate_Object
10861 Analyzed_Formal
: Node_Id
) return List_Id
10863 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
10864 A_Gen_Obj
: constant Entity_Id
:=
10865 Defining_Identifier
(Analyzed_Formal
);
10866 Acc_Def
: Node_Id
:= Empty
;
10867 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
10868 Actual_Decl
: Node_Id
:= Empty
;
10869 Decl_Node
: Node_Id
;
10872 List
: constant List_Id
:= New_List
;
10873 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
10874 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
10875 Subt_Decl
: Node_Id
:= Empty
;
10876 Subt_Mark
: Node_Id
:= Empty
;
10878 function Copy_Access_Def
return Node_Id
;
10879 -- If formal is an anonymous access, copy access definition of formal
10880 -- for generated object declaration.
10882 ---------------------
10883 -- Copy_Access_Def --
10884 ---------------------
10886 function Copy_Access_Def
return Node_Id
is
10888 Def
:= New_Copy_Tree
(Acc_Def
);
10890 -- In addition, if formal is an access to subprogram we need to
10891 -- generate new formals for the signature of the default, so that
10892 -- the tree is properly formatted for ASIS use.
10894 if Present
(Access_To_Subprogram_Definition
(Acc_Def
)) then
10896 Par_Spec
: Node_Id
;
10899 First
(Parameter_Specifications
10900 (Access_To_Subprogram_Definition
(Def
)));
10901 while Present
(Par_Spec
) loop
10902 Set_Defining_Identifier
(Par_Spec
,
10903 Make_Defining_Identifier
(Sloc
(Acc_Def
),
10904 Chars
=> Chars
(Defining_Identifier
(Par_Spec
))));
10911 end Copy_Access_Def
;
10913 -- Start of processing for Instantiate_Object
10916 -- Formal may be an anonymous access
10918 if Present
(Subtype_Mark
(Formal
)) then
10919 Subt_Mark
:= Subtype_Mark
(Formal
);
10921 Check_Access_Definition
(Formal
);
10922 Acc_Def
:= Access_Definition
(Formal
);
10925 -- Sloc for error message on missing actual
10927 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
10929 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
10930 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
10933 Set_Parent
(List
, Parent
(Actual
));
10937 if Out_Present
(Formal
) then
10939 -- An IN OUT generic actual must be a name. The instantiation is a
10940 -- renaming declaration. The actual is the name being renamed. We
10941 -- use the actual directly, rather than a copy, because it is not
10942 -- used further in the list of actuals, and because a copy or a use
10943 -- of relocate_node is incorrect if the instance is nested within a
10944 -- generic. In order to simplify ASIS searches, the Generic_Parent
10945 -- field links the declaration to the generic association.
10947 if No
(Actual
) then
10949 ("missing actual &",
10950 Instantiation_Node
, Gen_Obj
);
10952 ("\in instantiation of & declared#",
10953 Instantiation_Node
, Scope
(A_Gen_Obj
));
10954 Abandon_Instantiation
(Instantiation_Node
);
10957 if Present
(Subt_Mark
) then
10959 Make_Object_Renaming_Declaration
(Loc
,
10960 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10961 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
10964 else pragma Assert
(Present
(Acc_Def
));
10966 Make_Object_Renaming_Declaration
(Loc
,
10967 Defining_Identifier
=> New_Copy
(Gen_Obj
),
10968 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
10972 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
10974 -- The analysis of the actual may produce Insert_Action nodes, so
10975 -- the declaration must have a context in which to attach them.
10977 Append
(Decl_Node
, List
);
10980 -- Return if the analysis of the actual reported some error
10982 if Etype
(Actual
) = Any_Type
then
10986 -- This check is performed here because Analyze_Object_Renaming will
10987 -- not check it when Comes_From_Source is False. Note though that the
10988 -- check for the actual being the name of an object will be performed
10989 -- in Analyze_Object_Renaming.
10991 if Is_Object_Reference
(Actual
)
10992 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
10995 ("illegal discriminant-dependent component for in out parameter",
10999 -- The actual has to be resolved in order to check that it is a
11000 -- variable (due to cases such as F (1), where F returns access to
11001 -- an array, and for overloaded prefixes).
11003 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
11005 -- If the type of the formal is not itself a formal, and the current
11006 -- unit is a child unit, the formal type must be declared in a
11007 -- parent, and must be retrieved by visibility.
11009 if Ftyp
= Orig_Ftyp
11010 and then Is_Generic_Unit
(Scope
(Ftyp
))
11011 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
11014 Temp
: constant Node_Id
:=
11015 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
11017 Set_Entity
(Temp
, Empty
);
11019 Ftyp
:= Entity
(Temp
);
11023 if Is_Private_Type
(Ftyp
)
11024 and then not Is_Private_Type
(Etype
(Actual
))
11025 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
11026 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
11028 -- If the actual has the type of the full view of the formal, or
11029 -- else a non-private subtype of the formal, then the visibility
11030 -- of the formal type has changed. Add to the actuals a subtype
11031 -- declaration that will force the exchange of views in the body
11032 -- of the instance as well.
11035 Make_Subtype_Declaration
(Loc
,
11036 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
11037 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
11039 Prepend
(Subt_Decl
, List
);
11041 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
11042 Exchange_Declarations
(Ftyp
);
11045 Resolve
(Actual
, Ftyp
);
11047 if not Denotes_Variable
(Actual
) then
11048 Error_Msg_NE
("actual for& must be a variable", Actual
, Gen_Obj
);
11050 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
11052 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
11053 -- the type of the actual shall resolve to a specific anonymous
11056 if Ada_Version
< Ada_2005
11057 or else Ekind
(Base_Type
(Ftyp
)) /=
11058 E_Anonymous_Access_Type
11059 or else Ekind
(Base_Type
(Etype
(Actual
))) /=
11060 E_Anonymous_Access_Type
11063 ("type of actual does not match type of&", Actual
, Gen_Obj
);
11067 Note_Possible_Modification
(Actual
, Sure
=> True);
11069 -- Check for instantiation of atomic/volatile actual for
11070 -- non-atomic/volatile formal (RM C.6 (12)).
11072 if Is_Atomic_Object
(Actual
) and then not Is_Atomic
(Orig_Ftyp
) then
11074 ("cannot instantiate non-atomic formal object "
11075 & "with atomic actual", Actual
);
11077 elsif Is_Volatile_Object
(Actual
) and then not Is_Volatile
(Orig_Ftyp
)
11080 ("cannot instantiate non-volatile formal object "
11081 & "with volatile actual", Actual
);
11084 -- Formal in-parameter
11087 -- The instantiation of a generic formal in-parameter is constant
11088 -- declaration. The actual is the expression for that declaration.
11089 -- Its type is a full copy of the type of the formal. This may be
11090 -- an access to subprogram, for which we need to generate entities
11091 -- for the formals in the new signature.
11093 if Present
(Actual
) then
11094 if Present
(Subt_Mark
) then
11095 Def
:= New_Copy_Tree
(Subt_Mark
);
11096 else pragma Assert
(Present
(Acc_Def
));
11097 Def
:= Copy_Access_Def
;
11101 Make_Object_Declaration
(Loc
,
11102 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11103 Constant_Present
=> True,
11104 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11105 Object_Definition
=> Def
,
11106 Expression
=> Actual
);
11108 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
11110 -- A generic formal object of a tagged type is defined to be
11111 -- aliased so the new constant must also be treated as aliased.
11113 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
11114 Set_Aliased_Present
(Decl_Node
);
11117 Append
(Decl_Node
, List
);
11119 -- No need to repeat (pre-)analysis of some expression nodes
11120 -- already handled in Preanalyze_Actuals.
11122 if Nkind
(Actual
) /= N_Allocator
then
11125 -- Return if the analysis of the actual reported some error
11127 if Etype
(Actual
) = Any_Type
then
11133 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
11137 Typ
:= Get_Instance_Of
(Formal_Type
);
11139 -- If the actual appears in the current or an enclosing scope,
11140 -- use its type directly. This is relevant if it has an actual
11141 -- subtype that is distinct from its nominal one. This cannot
11142 -- be done in general because the type of the actual may
11143 -- depend on other actuals, and only be fully determined when
11144 -- the enclosing instance is analyzed.
11146 if Present
(Etype
(Actual
))
11147 and then Is_Constr_Subt_For_U_Nominal
(Etype
(Actual
))
11149 Freeze_Before
(Instantiation_Node
, Etype
(Actual
));
11151 Freeze_Before
(Instantiation_Node
, Typ
);
11154 -- If the actual is an aggregate, perform name resolution on
11155 -- its components (the analysis of an aggregate does not do it)
11156 -- to capture local names that may be hidden if the generic is
11159 if Nkind
(Actual
) = N_Aggregate
then
11160 Preanalyze_And_Resolve
(Actual
, Typ
);
11163 if Is_Limited_Type
(Typ
)
11164 and then not OK_For_Limited_Init
(Typ
, Actual
)
11167 ("initialization not allowed for limited types", Actual
);
11168 Explain_Limited_Type
(Typ
, Actual
);
11172 elsif Present
(Default_Expression
(Formal
)) then
11174 -- Use default to construct declaration
11176 if Present
(Subt_Mark
) then
11177 Def
:= New_Copy
(Subt_Mark
);
11178 else pragma Assert
(Present
(Acc_Def
));
11179 Def
:= Copy_Access_Def
;
11183 Make_Object_Declaration
(Sloc
(Formal
),
11184 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11185 Constant_Present
=> True,
11186 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11187 Object_Definition
=> Def
,
11188 Expression
=> New_Copy_Tree
11189 (Default_Expression
(Formal
)));
11191 Set_Corresponding_Generic_Association
11192 (Decl_Node
, Expression
(Decl_Node
));
11194 Append
(Decl_Node
, List
);
11195 Set_Analyzed
(Expression
(Decl_Node
), False);
11198 Error_Msg_NE
("missing actual&", Instantiation_Node
, Gen_Obj
);
11199 Error_Msg_NE
("\in instantiation of & declared#",
11200 Instantiation_Node
, Scope
(A_Gen_Obj
));
11202 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
11204 -- Create dummy constant declaration so that instance can be
11205 -- analyzed, to minimize cascaded visibility errors.
11207 if Present
(Subt_Mark
) then
11209 else pragma Assert
(Present
(Acc_Def
));
11214 Make_Object_Declaration
(Loc
,
11215 Defining_Identifier
=> New_Copy
(Gen_Obj
),
11216 Constant_Present
=> True,
11217 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
11218 Object_Definition
=> New_Copy
(Def
),
11220 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
11221 Attribute_Name
=> Name_First
,
11222 Prefix
=> New_Copy
(Def
)));
11224 Append
(Decl_Node
, List
);
11227 Abandon_Instantiation
(Instantiation_Node
);
11232 if Nkind
(Actual
) in N_Has_Entity
then
11233 Actual_Decl
:= Parent
(Entity
(Actual
));
11236 -- Ada 2005 (AI-423): For a formal object declaration with a null
11237 -- exclusion or an access definition that has a null exclusion: If the
11238 -- actual matching the formal object declaration denotes a generic
11239 -- formal object of another generic unit G, and the instantiation
11240 -- containing the actual occurs within the body of G or within the body
11241 -- of a generic unit declared within the declarative region of G, then
11242 -- the declaration of the formal object of G must have a null exclusion.
11243 -- Otherwise, the subtype of the actual matching the formal object
11244 -- declaration shall exclude null.
11246 if Ada_Version
>= Ada_2005
11247 and then Present
(Actual_Decl
)
11248 and then Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
11249 N_Object_Declaration
)
11250 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
11251 and then not Has_Null_Exclusion
(Actual_Decl
)
11252 and then Has_Null_Exclusion
(Analyzed_Formal
)
11254 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
11256 ("actual must exclude null to match generic formal#", Actual
);
11259 -- An effectively volatile object cannot be used as an actual in a
11260 -- generic instantiation (SPARK RM 7.1.3(7)). The following check is
11261 -- relevant only when SPARK_Mode is on as it is not a standard Ada
11262 -- legality rule, and also verifies that the actual is an object.
11265 and then Present
(Actual
)
11266 and then Is_Object_Reference
(Actual
)
11267 and then Is_Effectively_Volatile_Object
(Actual
)
11270 ("volatile object cannot act as actual in generic instantiation",
11275 end Instantiate_Object
;
11277 ------------------------------
11278 -- Instantiate_Package_Body --
11279 ------------------------------
11281 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11282 -- must be replaced by gotos which jump to the end of the routine in order
11283 -- to restore the Ghost and SPARK modes.
11285 procedure Instantiate_Package_Body
11286 (Body_Info
: Pending_Body_Info
;
11287 Inlined_Body
: Boolean := False;
11288 Body_Optional
: Boolean := False)
11290 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11291 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11292 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
11293 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11294 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11295 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11296 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11297 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11299 procedure Check_Initialized_Types
;
11300 -- In a generic package body, an entity of a generic private type may
11301 -- appear uninitialized. This is suspicious, unless the actual is a
11302 -- fully initialized type.
11304 -----------------------------
11305 -- Check_Initialized_Types --
11306 -----------------------------
11308 procedure Check_Initialized_Types
is
11310 Formal
: Entity_Id
;
11311 Actual
: Entity_Id
;
11312 Uninit_Var
: Entity_Id
;
11315 Decl
:= First
(Generic_Formal_Declarations
(Gen_Decl
));
11316 while Present
(Decl
) loop
11317 Uninit_Var
:= Empty
;
11319 if Nkind
(Decl
) = N_Private_Extension_Declaration
then
11320 Uninit_Var
:= Uninitialized_Variable
(Decl
);
11322 elsif Nkind
(Decl
) = N_Formal_Type_Declaration
11323 and then Nkind
(Formal_Type_Definition
(Decl
)) =
11324 N_Formal_Private_Type_Definition
11327 Uninitialized_Variable
(Formal_Type_Definition
(Decl
));
11330 if Present
(Uninit_Var
) then
11331 Formal
:= Defining_Identifier
(Decl
);
11332 Actual
:= First_Entity
(Act_Decl_Id
);
11334 -- For each formal there is a subtype declaration that renames
11335 -- the actual and has the same name as the formal. Locate the
11336 -- formal for warning message about uninitialized variables
11337 -- in the generic, for which the actual type should be a fully
11338 -- initialized type.
11340 while Present
(Actual
) loop
11341 exit when Ekind
(Actual
) = E_Package
11342 and then Present
(Renamed_Object
(Actual
));
11344 if Chars
(Actual
) = Chars
(Formal
)
11345 and then not Is_Scalar_Type
(Actual
)
11346 and then not Is_Fully_Initialized_Type
(Actual
)
11347 and then Warn_On_No_Value_Assigned
11349 Error_Msg_Node_2
:= Formal
;
11351 ("generic unit has uninitialized variable& of "
11352 & "formal private type &?v?", Actual
, Uninit_Var
);
11354 ("actual type for& should be fully initialized type?v?",
11359 Next_Entity
(Actual
);
11365 end Check_Initialized_Types
;
11369 -- The following constants capture the context prior to instantiating
11370 -- the package body.
11372 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
11373 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11374 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
11375 Saved_ISMP
: constant Boolean :=
11376 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11377 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
11378 Local_Suppress_Stack_Top
;
11379 Saved_SC
: constant Boolean := Style_Check
;
11380 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11381 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11382 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
11383 Saved_Warn
: constant Warning_Record
:= Save_Warnings
;
11385 Act_Body
: Node_Id
;
11386 Act_Body_Id
: Entity_Id
;
11387 Act_Body_Name
: Node_Id
;
11388 Gen_Body
: Node_Id
;
11389 Gen_Body_Id
: Node_Id
;
11390 Par_Ent
: Entity_Id
:= Empty
;
11391 Par_Installed
: Boolean := False;
11392 Par_Vis
: Boolean := False;
11394 Vis_Prims_List
: Elist_Id
:= No_Elist
;
11395 -- List of primitives made temporarily visible in the instantiation
11396 -- to match the visibility of the formal type.
11398 -- Start of processing for Instantiate_Package_Body
11401 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11403 -- The instance body may already have been processed, as the parent of
11404 -- another instance that is inlined (Load_Parent_Of_Generic).
11406 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
11410 -- The package being instantiated may be subject to pragma Ghost. Set
11411 -- the mode now to ensure that any nodes generated during instantiation
11412 -- are properly marked as Ghost.
11414 Set_Ghost_Mode
(Act_Decl_Id
);
11416 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11418 -- Re-establish the state of information on which checks are suppressed.
11419 -- This information was set in Body_Info at the point of instantiation,
11420 -- and now we restore it so that the instance is compiled using the
11421 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11423 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
11424 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
11426 Restore_Config_Switches
(Body_Info
.Config_Switches
);
11427 Restore_Warnings
(Body_Info
.Warnings
);
11429 if No
(Gen_Body_Id
) then
11431 -- Do not look for parent of generic body if none is required.
11432 -- This may happen when the routine is called as part of the
11433 -- Pending_Instantiations processing, when nested instances
11434 -- may precede the one generated from the main unit.
11436 if not Unit_Requires_Body
(Defining_Entity
(Gen_Decl
))
11437 and then Body_Optional
11441 Load_Parent_Of_Generic
11442 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
11443 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11447 -- Establish global variable for sloc adjustment and for error recovery
11448 -- In the case of an instance body for an instantiation with actuals
11449 -- from a limited view, the instance body is placed at the beginning
11450 -- of the enclosing package body: use the body entity as the source
11451 -- location for nodes of the instance body.
11453 if not Is_Empty_Elmt_List
(Incomplete_Actuals
(Act_Decl_Id
)) then
11455 Scop
: constant Entity_Id
:= Scope
(Act_Decl_Id
);
11456 Body_Id
: constant Node_Id
:=
11457 Corresponding_Body
(Unit_Declaration_Node
(Scop
));
11460 Instantiation_Node
:= Body_Id
;
11463 Instantiation_Node
:= Inst_Node
;
11466 if Present
(Gen_Body_Id
) then
11467 Save_Env
(Gen_Unit
, Act_Decl_Id
);
11468 Style_Check
:= False;
11470 -- If the context of the instance is subject to SPARK_Mode "off", the
11471 -- annotation is missing, or the body is instantiated at a later pass
11472 -- and its spec ignored SPARK_Mode pragma, set the global flag which
11473 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
11476 if SPARK_Mode
/= On
11477 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
11479 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
11482 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
11483 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
11485 Create_Instantiation_Source
11486 (Inst_Node
, Gen_Body_Id
, S_Adjustment
);
11490 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
11492 -- Create proper (possibly qualified) defining name for the body, to
11493 -- correspond to the one in the spec.
11496 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
11497 Set_Comes_From_Source
(Act_Body_Id
, Comes_From_Source
(Act_Decl_Id
));
11499 -- Some attributes of spec entity are not inherited by body entity
11501 Set_Handler_Records
(Act_Body_Id
, No_List
);
11503 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
11504 N_Defining_Program_Unit_Name
11507 Make_Defining_Program_Unit_Name
(Loc
,
11509 New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
11510 Defining_Identifier
=> Act_Body_Id
);
11512 Act_Body_Name
:= Act_Body_Id
;
11515 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
11517 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
11518 Check_Generic_Actuals
(Act_Decl_Id
, False);
11519 Check_Initialized_Types
;
11521 -- Install primitives hidden at the point of the instantiation but
11522 -- visible when processing the generic formals
11528 E
:= First_Entity
(Act_Decl_Id
);
11529 while Present
(E
) loop
11531 and then not Is_Itype
(E
)
11532 and then Is_Generic_Actual_Type
(E
)
11533 and then Is_Tagged_Type
(E
)
11535 Install_Hidden_Primitives
11536 (Prims_List
=> Vis_Prims_List
,
11537 Gen_T
=> Generic_Parent_Type
(Parent
(E
)),
11545 -- If it is a child unit, make the parent instance (which is an
11546 -- instance of the parent of the generic) visible. The parent
11547 -- instance is the prefix of the name of the generic unit.
11549 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
11550 and then Nkind
(Gen_Id
) = N_Expanded_Name
11552 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
11553 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11554 Install_Parent
(Par_Ent
, In_Body
=> True);
11555 Par_Installed
:= True;
11557 elsif Is_Child_Unit
(Gen_Unit
) then
11558 Par_Ent
:= Scope
(Gen_Unit
);
11559 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11560 Install_Parent
(Par_Ent
, In_Body
=> True);
11561 Par_Installed
:= True;
11564 -- If the instantiation is a library unit, and this is the main unit,
11565 -- then build the resulting compilation unit nodes for the instance.
11566 -- If this is a compilation unit but it is not the main unit, then it
11567 -- is the body of a unit in the context, that is being compiled
11568 -- because it is encloses some inlined unit or another generic unit
11569 -- being instantiated. In that case, this body is not part of the
11570 -- current compilation, and is not attached to the tree, but its
11571 -- parent must be set for analysis.
11573 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11575 -- Replace instance node with body of instance, and create new
11576 -- node for corresponding instance declaration.
11578 Build_Instance_Compilation_Unit_Nodes
11579 (Inst_Node
, Act_Body
, Act_Decl
);
11580 Analyze
(Inst_Node
);
11582 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
11584 -- If the instance is a child unit itself, then set the scope
11585 -- of the expanded body to be the parent of the instantiation
11586 -- (ensuring that the fully qualified name will be generated
11587 -- for the elaboration subprogram).
11589 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
11590 N_Defining_Program_Unit_Name
11592 Set_Scope
(Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
11596 -- Case where instantiation is not a library unit
11599 -- If this is an early instantiation, i.e. appears textually
11600 -- before the corresponding body and must be elaborated first,
11601 -- indicate that the body instance is to be delayed.
11603 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
11605 -- Now analyze the body. We turn off all checks if this is an
11606 -- internal unit, since there is no reason to have checks on for
11607 -- any predefined run-time library code. All such code is designed
11608 -- to be compiled with checks off.
11610 -- Note that we do NOT apply this criterion to children of GNAT
11611 -- The latter units must suppress checks explicitly if needed.
11613 -- We also do not suppress checks in CodePeer mode where we are
11614 -- interested in finding possible runtime errors.
11616 if not CodePeer_Mode
11617 and then In_Predefined_Unit
(Gen_Decl
)
11619 Analyze
(Act_Body
, Suppress
=> All_Checks
);
11621 Analyze
(Act_Body
);
11625 Inherit_Context
(Gen_Body
, Inst_Node
);
11627 -- Remove the parent instances if they have been placed on the scope
11628 -- stack to compile the body.
11630 if Par_Installed
then
11631 Remove_Parent
(In_Body
=> True);
11633 -- Restore the previous visibility of the parent
11635 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
11638 Restore_Hidden_Primitives
(Vis_Prims_List
);
11639 Restore_Private_Views
(Act_Decl_Id
);
11641 -- Remove the current unit from visibility if this is an instance
11642 -- that is not elaborated on the fly for inlining purposes.
11644 if not Inlined_Body
then
11645 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
11650 -- If we have no body, and the unit requires a body, then complain. This
11651 -- complaint is suppressed if we have detected other errors (since a
11652 -- common reason for missing the body is that it had errors).
11653 -- In CodePeer mode, a warning has been emitted already, no need for
11654 -- further messages.
11656 elsif Unit_Requires_Body
(Gen_Unit
)
11657 and then not Body_Optional
11659 if CodePeer_Mode
then
11662 elsif Serious_Errors_Detected
= 0 then
11664 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
11666 -- Don't attempt to perform any cleanup actions if some other error
11667 -- was already detected, since this can cause blowups.
11673 -- Case of package that does not need a body
11676 -- If the instantiation of the declaration is a library unit, rewrite
11677 -- the original package instantiation as a package declaration in the
11678 -- compilation unit node.
11680 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11681 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
11682 Rewrite
(Inst_Node
, Act_Decl
);
11684 -- Generate elaboration entity, in case spec has elaboration code.
11685 -- This cannot be done when the instance is analyzed, because it
11686 -- is not known yet whether the body exists.
11688 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
11689 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
11691 -- If the instantiation is not a library unit, then append the
11692 -- declaration to the list of implicitly generated entities, unless
11693 -- it is already a list member which means that it was already
11696 elsif not Is_List_Member
(Act_Decl
) then
11697 Mark_Rewrite_Insertion
(Act_Decl
);
11698 Insert_Before
(Inst_Node
, Act_Decl
);
11704 -- Restore the context that was in effect prior to instantiating the
11707 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
11708 Local_Suppress_Stack_Top
:= Saved_LSST
;
11709 Scope_Suppress
:= Saved_SS
;
11710 Style_Check
:= Saved_SC
;
11712 Expander_Mode_Restore
;
11713 Restore_Config_Switches
(Saved_CS
);
11714 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
11715 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
11716 Restore_Warnings
(Saved_Warn
);
11717 end Instantiate_Package_Body
;
11719 ---------------------------------
11720 -- Instantiate_Subprogram_Body --
11721 ---------------------------------
11723 -- WARNING: This routine manages Ghost and SPARK regions. Return statements
11724 -- must be replaced by gotos which jump to the end of the routine in order
11725 -- to restore the Ghost and SPARK modes.
11727 procedure Instantiate_Subprogram_Body
11728 (Body_Info
: Pending_Body_Info
;
11729 Body_Optional
: Boolean := False)
11731 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
11732 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
11733 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
11734 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
11735 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
11736 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
11737 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
11738 Pack_Id
: constant Entity_Id
:=
11739 Defining_Unit_Name
(Parent
(Act_Decl
));
11741 -- The following constants capture the context prior to instantiating
11742 -- the subprogram body.
11744 Saved_CS
: constant Config_Switches_Type
:= Save_Config_Switches
;
11745 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
11746 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
11747 Saved_ISMP
: constant Boolean :=
11748 Ignore_SPARK_Mode_Pragmas_In_Instance
;
11749 Saved_LSST
: constant Suppress_Stack_Entry_Ptr
:=
11750 Local_Suppress_Stack_Top
;
11751 Saved_SC
: constant Boolean := Style_Check
;
11752 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
11753 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
11754 Saved_SS
: constant Suppress_Record
:= Scope_Suppress
;
11755 Saved_Warn
: constant Warning_Record
:= Save_Warnings
;
11757 Act_Body
: Node_Id
;
11758 Act_Body_Id
: Entity_Id
;
11759 Gen_Body
: Node_Id
;
11760 Gen_Body_Id
: Node_Id
;
11761 Pack_Body
: Node_Id
;
11762 Par_Ent
: Entity_Id
:= Empty
;
11763 Par_Installed
: Boolean := False;
11764 Par_Vis
: Boolean := False;
11765 Ret_Expr
: Node_Id
;
11768 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11770 -- Subprogram body may have been created already because of an inline
11771 -- pragma, or because of multiple elaborations of the enclosing package
11772 -- when several instances of the subprogram appear in the main unit.
11774 if Present
(Corresponding_Body
(Act_Decl
)) then
11778 -- The subprogram being instantiated may be subject to pragma Ghost. Set
11779 -- the mode now to ensure that any nodes generated during instantiation
11780 -- are properly marked as Ghost.
11782 Set_Ghost_Mode
(Act_Decl_Id
);
11784 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
11786 -- Re-establish the state of information on which checks are suppressed.
11787 -- This information was set in Body_Info at the point of instantiation,
11788 -- and now we restore it so that the instance is compiled using the
11789 -- check status at the instantiation (RM 11.5(7.2/2), AI95-00224-01).
11791 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
11792 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
11794 Restore_Config_Switches
(Body_Info
.Config_Switches
);
11795 Restore_Warnings
(Body_Info
.Warnings
);
11797 if No
(Gen_Body_Id
) then
11799 -- For imported generic subprogram, no body to compile, complete
11800 -- the spec entity appropriately.
11802 if Is_Imported
(Gen_Unit
) then
11803 Set_Is_Imported
(Act_Decl_Id
);
11804 Set_First_Rep_Item
(Act_Decl_Id
, First_Rep_Item
(Gen_Unit
));
11805 Set_Interface_Name
(Act_Decl_Id
, Interface_Name
(Gen_Unit
));
11806 Set_Convention
(Act_Decl_Id
, Convention
(Gen_Unit
));
11807 Set_Has_Completion
(Act_Decl_Id
);
11810 -- For other cases, compile the body
11813 Load_Parent_Of_Generic
11814 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
11815 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
11819 Instantiation_Node
:= Inst_Node
;
11821 if Present
(Gen_Body_Id
) then
11822 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
11824 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
11826 -- Either body is not present, or context is non-expanding, as
11827 -- when compiling a subunit. Mark the instance as completed, and
11828 -- diagnose a missing body when needed.
11831 and then Operating_Mode
= Generate_Code
11833 Error_Msg_N
("missing proper body for instantiation", Gen_Body
);
11836 Set_Has_Completion
(Act_Decl_Id
);
11840 Save_Env
(Gen_Unit
, Act_Decl_Id
);
11841 Style_Check
:= False;
11843 -- If the context of the instance is subject to SPARK_Mode "off", the
11844 -- annotation is missing, or the body is instantiated at a later pass
11845 -- and its spec ignored SPARK_Mode pragma, set the global flag which
11846 -- signals Analyze_Pragma to ignore all SPARK_Mode pragmas within the
11849 if SPARK_Mode
/= On
11850 or else Ignore_SPARK_Mode_Pragmas
(Act_Decl_Id
)
11852 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
11855 -- If the context of an instance is not subject to SPARK_Mode "off",
11856 -- and the generic body is subject to an explicit SPARK_Mode pragma,
11857 -- the latter should be the one applicable to the instance.
11859 if not Ignore_SPARK_Mode_Pragmas_In_Instance
11860 and then SPARK_Mode
/= Off
11861 and then Present
(SPARK_Pragma
(Gen_Body_Id
))
11863 Set_SPARK_Mode
(Gen_Body_Id
);
11866 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
11867 Create_Instantiation_Source
11874 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
11876 -- Create proper defining name for the body, to correspond to the one
11880 Make_Defining_Identifier
(Sloc
(Act_Decl_Id
), Chars
(Act_Decl_Id
));
11882 Set_Comes_From_Source
(Act_Body_Id
, Comes_From_Source
(Act_Decl_Id
));
11883 Set_Defining_Unit_Name
(Specification
(Act_Body
), Act_Body_Id
);
11885 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
11886 Set_Has_Completion
(Act_Decl_Id
);
11887 Check_Generic_Actuals
(Pack_Id
, False);
11889 -- Generate a reference to link the visible subprogram instance to
11890 -- the generic body, which for navigation purposes is the only
11891 -- available source for the instance.
11894 (Related_Instance
(Pack_Id
),
11895 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
11897 -- If it is a child unit, make the parent instance (which is an
11898 -- instance of the parent of the generic) visible. The parent
11899 -- instance is the prefix of the name of the generic unit.
11901 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
11902 and then Nkind
(Gen_Id
) = N_Expanded_Name
11904 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
11905 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11906 Install_Parent
(Par_Ent
, In_Body
=> True);
11907 Par_Installed
:= True;
11909 elsif Is_Child_Unit
(Gen_Unit
) then
11910 Par_Ent
:= Scope
(Gen_Unit
);
11911 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
11912 Install_Parent
(Par_Ent
, In_Body
=> True);
11913 Par_Installed
:= True;
11916 -- Subprogram body is placed in the body of wrapper package,
11917 -- whose spec contains the subprogram declaration as well as
11918 -- the renaming declarations for the generic parameters.
11921 Make_Package_Body
(Loc
,
11922 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
11923 Declarations
=> New_List
(Act_Body
));
11925 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
11927 -- If the instantiation is a library unit, then build resulting
11928 -- compilation unit nodes for the instance. The declaration of
11929 -- the enclosing package is the grandparent of the subprogram
11930 -- declaration. First replace the instantiation node as the unit
11931 -- of the corresponding compilation.
11933 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
11934 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
11935 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
11936 Build_Instance_Compilation_Unit_Nodes
11937 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
11938 Analyze
(Inst_Node
);
11940 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
11941 Analyze
(Pack_Body
);
11945 Insert_Before
(Inst_Node
, Pack_Body
);
11946 Mark_Rewrite_Insertion
(Pack_Body
);
11947 Analyze
(Pack_Body
);
11949 if Expander_Active
then
11950 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
11954 Inherit_Context
(Gen_Body
, Inst_Node
);
11956 Restore_Private_Views
(Pack_Id
, False);
11958 if Par_Installed
then
11959 Remove_Parent
(In_Body
=> True);
11961 -- Restore the previous visibility of the parent
11963 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
11968 -- Body not found. Error was emitted already. If there were no previous
11969 -- errors, this may be an instance whose scope is a premature instance.
11970 -- In that case we must insure that the (legal) program does raise
11971 -- program error if executed. We generate a subprogram body for this
11972 -- purpose. See DEC ac30vso.
11974 -- Should not reference proprietary DEC tests in comments ???
11976 elsif Serious_Errors_Detected
= 0
11977 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
11979 if Body_Optional
then
11982 elsif Ekind
(Act_Decl_Id
) = E_Procedure
then
11984 Make_Subprogram_Body
(Loc
,
11986 Make_Procedure_Specification
(Loc
,
11987 Defining_Unit_Name
=>
11988 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
11989 Parameter_Specifications
=>
11991 (Parameter_Specifications
(Parent
(Act_Decl_Id
)))),
11993 Declarations
=> Empty_List
,
11994 Handled_Statement_Sequence
=>
11995 Make_Handled_Sequence_Of_Statements
(Loc
,
11996 Statements
=> New_List
(
11997 Make_Raise_Program_Error
(Loc
,
11998 Reason
=> PE_Access_Before_Elaboration
))));
12002 Make_Raise_Program_Error
(Loc
,
12003 Reason
=> PE_Access_Before_Elaboration
);
12005 Set_Etype
(Ret_Expr
, (Etype
(Act_Decl_Id
)));
12006 Set_Analyzed
(Ret_Expr
);
12009 Make_Subprogram_Body
(Loc
,
12011 Make_Function_Specification
(Loc
,
12012 Defining_Unit_Name
=>
12013 Make_Defining_Identifier
(Loc
, Chars
(Act_Decl_Id
)),
12014 Parameter_Specifications
=>
12016 (Parameter_Specifications
(Parent
(Act_Decl_Id
))),
12017 Result_Definition
=>
12018 New_Occurrence_Of
(Etype
(Act_Decl_Id
), Loc
)),
12020 Declarations
=> Empty_List
,
12021 Handled_Statement_Sequence
=>
12022 Make_Handled_Sequence_Of_Statements
(Loc
,
12023 Statements
=> New_List
(
12024 Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
12028 Make_Package_Body
(Loc
,
12029 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
12030 Declarations
=> New_List
(Act_Body
));
12032 Insert_After
(Inst_Node
, Pack_Body
);
12033 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
12034 Analyze
(Pack_Body
);
12039 -- Restore the context that was in effect prior to instantiating the
12040 -- subprogram body.
12042 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
12043 Local_Suppress_Stack_Top
:= Saved_LSST
;
12044 Scope_Suppress
:= Saved_SS
;
12045 Style_Check
:= Saved_SC
;
12047 Expander_Mode_Restore
;
12048 Restore_Config_Switches
(Saved_CS
);
12049 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
12050 Restore_SPARK_Mode
(Saved_SM
, Saved_SMP
);
12051 Restore_Warnings
(Saved_Warn
);
12052 end Instantiate_Subprogram_Body
;
12054 ----------------------
12055 -- Instantiate_Type --
12056 ----------------------
12058 function Instantiate_Type
12061 Analyzed_Formal
: Node_Id
;
12062 Actual_Decls
: List_Id
) return List_Id
12064 A_Gen_T
: constant Entity_Id
:=
12065 Defining_Identifier
(Analyzed_Formal
);
12066 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
12067 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
12069 Ancestor
: Entity_Id
:= Empty
;
12070 Decl_Node
: Node_Id
;
12071 Decl_Nodes
: List_Id
;
12075 procedure Diagnose_Predicated_Actual
;
12076 -- There are a number of constructs in which a discrete type with
12077 -- predicates is illegal, e.g. as an index in an array type declaration.
12078 -- If a generic type is used is such a construct in a generic package
12079 -- declaration, it carries the flag No_Predicate_On_Actual. it is part
12080 -- of the generic contract that the actual cannot have predicates.
12082 procedure Validate_Array_Type_Instance
;
12083 procedure Validate_Access_Subprogram_Instance
;
12084 procedure Validate_Access_Type_Instance
;
12085 procedure Validate_Derived_Type_Instance
;
12086 procedure Validate_Derived_Interface_Type_Instance
;
12087 procedure Validate_Discriminated_Formal_Type
;
12088 procedure Validate_Interface_Type_Instance
;
12089 procedure Validate_Private_Type_Instance
;
12090 procedure Validate_Incomplete_Type_Instance
;
12091 -- These procedures perform validation tests for the named case.
12092 -- Validate_Discriminated_Formal_Type is shared by formal private
12093 -- types and Ada 2012 formal incomplete types.
12095 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
12096 -- Check that base types are the same and that the subtypes match
12097 -- statically. Used in several of the above.
12099 ---------------------------------
12100 -- Diagnose_Predicated_Actual --
12101 ---------------------------------
12103 procedure Diagnose_Predicated_Actual
is
12105 if No_Predicate_On_Actual
(A_Gen_T
)
12106 and then Has_Predicates
(Act_T
)
12109 ("actual for& cannot be a type with predicate",
12110 Instantiation_Node
, A_Gen_T
);
12112 elsif No_Dynamic_Predicate_On_Actual
(A_Gen_T
)
12113 and then Has_Predicates
(Act_T
)
12114 and then not Has_Static_Predicate_Aspect
(Act_T
)
12117 ("actual for& cannot be a type with a dynamic predicate",
12118 Instantiation_Node
, A_Gen_T
);
12120 end Diagnose_Predicated_Actual
;
12122 --------------------
12123 -- Subtypes_Match --
12124 --------------------
12126 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
12127 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
12130 -- Some detailed comments would be useful here ???
12132 return ((Base_Type
(T
) = Act_T
12133 or else Base_Type
(T
) = Base_Type
(Act_T
))
12134 and then Subtypes_Statically_Match
(T
, Act_T
))
12136 or else (Is_Class_Wide_Type
(Gen_T
)
12137 and then Is_Class_Wide_Type
(Act_T
)
12138 and then Subtypes_Match
12139 (Get_Instance_Of
(Root_Type
(Gen_T
)),
12140 Root_Type
(Act_T
)))
12143 (Ekind_In
(Gen_T
, E_Anonymous_Access_Subprogram_Type
,
12144 E_Anonymous_Access_Type
)
12145 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
12146 and then Subtypes_Statically_Match
12147 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
12148 end Subtypes_Match
;
12150 -----------------------------------------
12151 -- Validate_Access_Subprogram_Instance --
12152 -----------------------------------------
12154 procedure Validate_Access_Subprogram_Instance
is
12156 if not Is_Access_Type
(Act_T
)
12157 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
12160 ("expect access type in instantiation of &", Actual
, Gen_T
);
12161 Abandon_Instantiation
(Actual
);
12164 -- According to AI05-288, actuals for access_to_subprograms must be
12165 -- subtype conformant with the generic formal. Previous to AI05-288
12166 -- only mode conformance was required.
12168 -- This is a binding interpretation that applies to previous versions
12169 -- of the language, no need to maintain previous weaker checks.
12171 Check_Subtype_Conformant
12172 (Designated_Type
(Act_T
),
12173 Designated_Type
(A_Gen_T
),
12177 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
12178 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
12180 ("protected access type not allowed for formal &",
12184 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
12186 ("expect protected access type for formal &",
12190 -- If the formal has a specified convention (which in most cases
12191 -- will be StdCall) verify that the actual has the same convention.
12193 if Has_Convention_Pragma
(A_Gen_T
)
12194 and then Convention
(A_Gen_T
) /= Convention
(Act_T
)
12196 Error_Msg_Name_1
:= Get_Convention_Name
(Convention
(A_Gen_T
));
12198 ("actual for formal & must have convention %", Actual
, Gen_T
);
12200 end Validate_Access_Subprogram_Instance
;
12202 -----------------------------------
12203 -- Validate_Access_Type_Instance --
12204 -----------------------------------
12206 procedure Validate_Access_Type_Instance
is
12207 Desig_Type
: constant Entity_Id
:=
12208 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
12209 Desig_Act
: Entity_Id
;
12212 if not Is_Access_Type
(Act_T
) then
12214 ("expect access type in instantiation of &", Actual
, Gen_T
);
12215 Abandon_Instantiation
(Actual
);
12218 if Is_Access_Constant
(A_Gen_T
) then
12219 if not Is_Access_Constant
(Act_T
) then
12221 ("actual type must be access-to-constant type", Actual
);
12222 Abandon_Instantiation
(Actual
);
12225 if Is_Access_Constant
(Act_T
) then
12227 ("actual type must be access-to-variable type", Actual
);
12228 Abandon_Instantiation
(Actual
);
12230 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
12231 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
12233 Error_Msg_N
-- CODEFIX
12234 ("actual must be general access type!", Actual
);
12235 Error_Msg_NE
-- CODEFIX
12236 ("add ALL to }!", Actual
, Act_T
);
12237 Abandon_Instantiation
(Actual
);
12241 -- The designated subtypes, that is to say the subtypes introduced
12242 -- by an access type declaration (and not by a subtype declaration)
12245 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
12247 -- The designated type may have been introduced through a limited_
12248 -- with clause, in which case retrieve the non-limited view. This
12249 -- applies to incomplete types as well as to class-wide types.
12251 if From_Limited_With
(Desig_Act
) then
12252 Desig_Act
:= Available_View
(Desig_Act
);
12255 if not Subtypes_Match
(Desig_Type
, Desig_Act
) then
12257 ("designated type of actual does not match that of formal &",
12260 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
12261 Error_Msg_N
("\predicates do not match", Actual
);
12264 Abandon_Instantiation
(Actual
);
12266 elsif Is_Access_Type
(Designated_Type
(Act_T
))
12267 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
12269 Is_Constrained
(Designated_Type
(Desig_Type
))
12272 ("designated type of actual does not match that of formal &",
12275 if not Predicates_Match
(Desig_Type
, Desig_Act
) then
12276 Error_Msg_N
("\predicates do not match", Actual
);
12279 Abandon_Instantiation
(Actual
);
12282 -- Ada 2005: null-exclusion indicators of the two types must agree
12284 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
12286 ("non null exclusion of actual and formal & do not match",
12289 end Validate_Access_Type_Instance
;
12291 ----------------------------------
12292 -- Validate_Array_Type_Instance --
12293 ----------------------------------
12295 procedure Validate_Array_Type_Instance
is
12300 function Formal_Dimensions
return Nat
;
12301 -- Count number of dimensions in array type formal
12303 -----------------------
12304 -- Formal_Dimensions --
12305 -----------------------
12307 function Formal_Dimensions
return Nat
is
12312 if Nkind
(Def
) = N_Constrained_Array_Definition
then
12313 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
12315 Index
:= First
(Subtype_Marks
(Def
));
12318 while Present
(Index
) loop
12320 Next_Index
(Index
);
12324 end Formal_Dimensions
;
12326 -- Start of processing for Validate_Array_Type_Instance
12329 if not Is_Array_Type
(Act_T
) then
12331 ("expect array type in instantiation of &", Actual
, Gen_T
);
12332 Abandon_Instantiation
(Actual
);
12334 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
12335 if not (Is_Constrained
(Act_T
)) then
12337 ("expect constrained array in instantiation of &",
12339 Abandon_Instantiation
(Actual
);
12343 if Is_Constrained
(Act_T
) then
12345 ("expect unconstrained array in instantiation of &",
12347 Abandon_Instantiation
(Actual
);
12351 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
12353 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
12354 Abandon_Instantiation
(Actual
);
12357 I1
:= First_Index
(A_Gen_T
);
12358 I2
:= First_Index
(Act_T
);
12359 for J
in 1 .. Formal_Dimensions
loop
12361 -- If the indexes of the actual were given by a subtype_mark,
12362 -- the index was transformed into a range attribute. Retrieve
12363 -- the original type mark for checking.
12365 if Is_Entity_Name
(Original_Node
(I2
)) then
12366 T2
:= Entity
(Original_Node
(I2
));
12371 if not Subtypes_Match
12372 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
12375 ("index types of actual do not match those of formal &",
12377 Abandon_Instantiation
(Actual
);
12384 -- Check matching subtypes. Note that there are complex visibility
12385 -- issues when the generic is a child unit and some aspect of the
12386 -- generic type is declared in a parent unit of the generic. We do
12387 -- the test to handle this special case only after a direct check
12388 -- for static matching has failed. The case where both the component
12389 -- type and the array type are separate formals, and the component
12390 -- type is a private view may also require special checking in
12391 -- Subtypes_Match. Finally, we assume that a child instance where
12392 -- the component type comes from a formal of a parent instance is
12393 -- correct because the generic was correct. A more precise check
12394 -- seems too complex to install???
12397 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
12400 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
12401 Component_Type
(Act_T
))
12403 (not Inside_A_Generic
12404 and then Is_Child_Unit
(Scope
(Component_Type
(A_Gen_T
))))
12409 ("component subtype of actual does not match that of formal &",
12411 Abandon_Instantiation
(Actual
);
12414 if Has_Aliased_Components
(A_Gen_T
)
12415 and then not Has_Aliased_Components
(Act_T
)
12418 ("actual must have aliased components to match formal type &",
12421 end Validate_Array_Type_Instance
;
12423 -----------------------------------------------
12424 -- Validate_Derived_Interface_Type_Instance --
12425 -----------------------------------------------
12427 procedure Validate_Derived_Interface_Type_Instance
is
12428 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
12432 -- First apply interface instance checks
12434 Validate_Interface_Type_Instance
;
12436 -- Verify that immediate parent interface is an ancestor of
12440 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
12443 ("interface actual must include progenitor&", Actual
, Par
);
12446 -- Now verify that the actual includes all other ancestors of
12449 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
12450 while Present
(Elmt
) loop
12451 if not Interface_Present_In_Ancestor
12452 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
12455 ("interface actual must include progenitor&",
12456 Actual
, Node
(Elmt
));
12461 end Validate_Derived_Interface_Type_Instance
;
12463 ------------------------------------
12464 -- Validate_Derived_Type_Instance --
12465 ------------------------------------
12467 procedure Validate_Derived_Type_Instance
is
12468 Actual_Discr
: Entity_Id
;
12469 Ancestor_Discr
: Entity_Id
;
12472 -- Verify that the actual includes the progenitors of the formal,
12473 -- if any. The formal may depend on previous formals and their
12474 -- instance, so we must examine instance of interfaces if present.
12475 -- The actual may be an extension of an interface, in which case
12476 -- it does not appear in the interface list, so this must be
12477 -- checked separately.
12479 if Present
(Interface_List
(Def
)) then
12480 if not Has_Interfaces
(Act_T
) then
12482 ("actual must implement all interfaces of formal&",
12487 Act_Iface_List
: Elist_Id
;
12489 Iface_Ent
: Entity_Id
;
12491 function Instance_Exists
(I
: Entity_Id
) return Boolean;
12492 -- If the interface entity is declared in a generic unit,
12493 -- this can only be legal if we are within an instantiation
12494 -- of a child of that generic. There is currently no
12495 -- mechanism to relate an interface declared within a
12496 -- generic to the corresponding interface in an instance,
12497 -- so we traverse the list of interfaces of the actual,
12498 -- looking for a name match.
12500 ---------------------
12501 -- Instance_Exists --
12502 ---------------------
12504 function Instance_Exists
(I
: Entity_Id
) return Boolean is
12505 Iface_Elmt
: Elmt_Id
;
12508 Iface_Elmt
:= First_Elmt
(Act_Iface_List
);
12509 while Present
(Iface_Elmt
) loop
12510 if Is_Generic_Instance
(Scope
(Node
(Iface_Elmt
)))
12511 and then Chars
(Node
(Iface_Elmt
)) = Chars
(I
)
12516 Next_Elmt
(Iface_Elmt
);
12520 end Instance_Exists
;
12523 Iface
:= First
(Abstract_Interface_List
(A_Gen_T
));
12524 Collect_Interfaces
(Act_T
, Act_Iface_List
);
12526 while Present
(Iface
) loop
12527 Iface_Ent
:= Get_Instance_Of
(Entity
(Iface
));
12529 if Is_Ancestor
(Iface_Ent
, Act_T
)
12530 or else Is_Progenitor
(Iface_Ent
, Act_T
)
12534 elsif Ekind
(Scope
(Iface_Ent
)) = E_Generic_Package
12535 and then Instance_Exists
(Iface_Ent
)
12540 Error_Msg_Name_1
:= Chars
(Act_T
);
12542 ("Actual% must implement interface&",
12543 Actual
, Etype
(Iface
));
12552 -- If the parent type in the generic declaration is itself a previous
12553 -- formal type, then it is local to the generic and absent from the
12554 -- analyzed generic definition. In that case the ancestor is the
12555 -- instance of the formal (which must have been instantiated
12556 -- previously), unless the ancestor is itself a formal derived type.
12557 -- In this latter case (which is the subject of Corrigendum 8652/0038
12558 -- (AI-202) the ancestor of the formals is the ancestor of its
12559 -- parent. Otherwise, the analyzed generic carries the parent type.
12560 -- If the parent type is defined in a previous formal package, then
12561 -- the scope of that formal package is that of the generic type
12562 -- itself, and it has already been mapped into the corresponding type
12563 -- in the actual package.
12565 -- Common case: parent type defined outside of the generic
12567 if Is_Entity_Name
(Subtype_Mark
(Def
))
12568 and then Present
(Entity
(Subtype_Mark
(Def
)))
12570 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
12572 -- Check whether parent is defined in a previous formal package
12575 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
12578 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
12580 -- The type may be a local derivation, or a type extension of a
12581 -- previous formal, or of a formal of a parent package.
12583 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
12585 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
12587 -- Check whether the parent is another derived formal type in the
12588 -- same generic unit.
12590 if Etype
(A_Gen_T
) /= A_Gen_T
12591 and then Is_Generic_Type
(Etype
(A_Gen_T
))
12592 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
12593 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
12595 -- Locate ancestor of parent from the subtype declaration
12596 -- created for the actual.
12602 Decl
:= First
(Actual_Decls
);
12603 while Present
(Decl
) loop
12604 if Nkind
(Decl
) = N_Subtype_Declaration
12605 and then Chars
(Defining_Identifier
(Decl
)) =
12606 Chars
(Etype
(A_Gen_T
))
12608 Ancestor
:= Generic_Parent_Type
(Decl
);
12616 pragma Assert
(Present
(Ancestor
));
12618 -- The ancestor itself may be a previous formal that has been
12621 Ancestor
:= Get_Instance_Of
(Ancestor
);
12625 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
12628 -- Check whether parent is a previous formal of the current generic
12630 elsif Is_Derived_Type
(A_Gen_T
)
12631 and then Is_Generic_Type
(Etype
(A_Gen_T
))
12632 and then Scope
(A_Gen_T
) = Scope
(Etype
(A_Gen_T
))
12634 Ancestor
:= Get_Instance_Of
(First_Subtype
(Etype
(A_Gen_T
)));
12636 -- An unusual case: the actual is a type declared in a parent unit,
12637 -- but is not a formal type so there is no instance_of for it.
12638 -- Retrieve it by analyzing the record extension.
12640 elsif Is_Child_Unit
(Scope
(A_Gen_T
))
12641 and then In_Open_Scopes
(Scope
(Act_T
))
12642 and then Is_Generic_Instance
(Scope
(Act_T
))
12644 Analyze
(Subtype_Mark
(Def
));
12645 Ancestor
:= Entity
(Subtype_Mark
(Def
));
12648 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
12651 -- If the formal derived type has pragma Preelaborable_Initialization
12652 -- then the actual type must have preelaborable initialization.
12654 if Known_To_Have_Preelab_Init
(A_Gen_T
)
12655 and then not Has_Preelaborable_Initialization
(Act_T
)
12658 ("actual for & must have preelaborable initialization",
12662 -- Ada 2005 (AI-251)
12664 if Ada_Version
>= Ada_2005
and then Is_Interface
(Ancestor
) then
12665 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
12667 ("(Ada 2005) expected type implementing & in instantiation",
12671 -- Finally verify that the (instance of) the ancestor is an ancestor
12674 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
12676 ("expect type derived from & in instantiation",
12677 Actual
, First_Subtype
(Ancestor
));
12678 Abandon_Instantiation
(Actual
);
12681 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
12682 -- that the formal type declaration has been rewritten as a private
12685 if Ada_Version
>= Ada_2005
12686 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
12687 and then Synchronized_Present
(Parent
(A_Gen_T
))
12689 -- The actual must be a synchronized tagged type
12691 if not Is_Tagged_Type
(Act_T
) then
12693 ("actual of synchronized type must be tagged", Actual
);
12694 Abandon_Instantiation
(Actual
);
12696 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
12697 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
12698 N_Derived_Type_Definition
12699 and then not Synchronized_Present
12700 (Type_Definition
(Parent
(Act_T
)))
12703 ("actual of synchronized type must be synchronized", Actual
);
12704 Abandon_Instantiation
(Actual
);
12708 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1
12709 -- removes the second instance of the phrase "or allow pass by copy".
12711 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
12713 ("cannot have atomic actual type for non-atomic formal type",
12716 elsif Is_Volatile
(Act_T
) and then not Is_Volatile
(Ancestor
) then
12718 ("cannot have volatile actual type for non-volatile formal type",
12722 -- It should not be necessary to check for unknown discriminants on
12723 -- Formal, but for some reason Has_Unknown_Discriminants is false for
12724 -- A_Gen_T, so Is_Definite_Subtype incorrectly returns True. This
12725 -- needs fixing. ???
12727 if Is_Definite_Subtype
(A_Gen_T
)
12728 and then not Unknown_Discriminants_Present
(Formal
)
12729 and then not Is_Definite_Subtype
(Act_T
)
12731 Error_Msg_N
("actual subtype must be constrained", Actual
);
12732 Abandon_Instantiation
(Actual
);
12735 if not Unknown_Discriminants_Present
(Formal
) then
12736 if Is_Constrained
(Ancestor
) then
12737 if not Is_Constrained
(Act_T
) then
12738 Error_Msg_N
("actual subtype must be constrained", Actual
);
12739 Abandon_Instantiation
(Actual
);
12742 -- Ancestor is unconstrained, Check if generic formal and actual
12743 -- agree on constrainedness. The check only applies to array types
12744 -- and discriminated types.
12746 elsif Is_Constrained
(Act_T
) then
12747 if Ekind
(Ancestor
) = E_Access_Type
12748 or else (not Is_Constrained
(A_Gen_T
)
12749 and then Is_Composite_Type
(A_Gen_T
))
12751 Error_Msg_N
("actual subtype must be unconstrained", Actual
);
12752 Abandon_Instantiation
(Actual
);
12755 -- A class-wide type is only allowed if the formal has unknown
12758 elsif Is_Class_Wide_Type
(Act_T
)
12759 and then not Has_Unknown_Discriminants
(Ancestor
)
12762 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
12763 Abandon_Instantiation
(Actual
);
12765 -- Otherwise, the formal and actual must have the same number
12766 -- of discriminants and each discriminant of the actual must
12767 -- correspond to a discriminant of the formal.
12769 elsif Has_Discriminants
(Act_T
)
12770 and then not Has_Unknown_Discriminants
(Act_T
)
12771 and then Has_Discriminants
(Ancestor
)
12773 Actual_Discr
:= First_Discriminant
(Act_T
);
12774 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
12775 while Present
(Actual_Discr
)
12776 and then Present
(Ancestor_Discr
)
12778 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
12779 No
(Corresponding_Discriminant
(Actual_Discr
))
12782 ("discriminant & does not correspond "
12783 & "to ancestor discriminant", Actual
, Actual_Discr
);
12784 Abandon_Instantiation
(Actual
);
12787 Next_Discriminant
(Actual_Discr
);
12788 Next_Discriminant
(Ancestor_Discr
);
12791 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
12793 ("actual for & must have same number of discriminants",
12795 Abandon_Instantiation
(Actual
);
12798 -- This case should be caught by the earlier check for
12799 -- constrainedness, but the check here is added for completeness.
12801 elsif Has_Discriminants
(Act_T
)
12802 and then not Has_Unknown_Discriminants
(Act_T
)
12805 ("actual for & must not have discriminants", Actual
, Gen_T
);
12806 Abandon_Instantiation
(Actual
);
12808 elsif Has_Discriminants
(Ancestor
) then
12810 ("actual for & must have known discriminants", Actual
, Gen_T
);
12811 Abandon_Instantiation
(Actual
);
12814 if not Subtypes_Statically_Compatible
12815 (Act_T
, Ancestor
, Formal_Derived_Matching
=> True)
12818 ("constraint on actual is incompatible with formal", Actual
);
12819 Abandon_Instantiation
(Actual
);
12823 -- If the formal and actual types are abstract, check that there
12824 -- are no abstract primitives of the actual type that correspond to
12825 -- nonabstract primitives of the formal type (second sentence of
12828 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
12829 Check_Abstract_Primitives
: declare
12830 Gen_Prims
: constant Elist_Id
:=
12831 Primitive_Operations
(A_Gen_T
);
12832 Gen_Elmt
: Elmt_Id
;
12833 Gen_Subp
: Entity_Id
;
12834 Anc_Subp
: Entity_Id
;
12835 Anc_Formal
: Entity_Id
;
12836 Anc_F_Type
: Entity_Id
;
12838 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
12839 Act_Elmt
: Elmt_Id
;
12840 Act_Subp
: Entity_Id
;
12841 Act_Formal
: Entity_Id
;
12842 Act_F_Type
: Entity_Id
;
12844 Subprograms_Correspond
: Boolean;
12846 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
12847 -- Returns true if T2 is derived directly or indirectly from
12848 -- T1, including derivations from interfaces. T1 and T2 are
12849 -- required to be specific tagged base types.
12851 ------------------------
12852 -- Is_Tagged_Ancestor --
12853 ------------------------
12855 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
12857 Intfc_Elmt
: Elmt_Id
;
12860 -- The predicate is satisfied if the types are the same
12865 -- If we've reached the top of the derivation chain then
12866 -- we know that T1 is not an ancestor of T2.
12868 elsif Etype
(T2
) = T2
then
12871 -- Proceed to check T2's immediate parent
12873 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
12876 -- Finally, check to see if T1 is an ancestor of any of T2's
12880 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
12881 while Present
(Intfc_Elmt
) loop
12882 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
12886 Next_Elmt
(Intfc_Elmt
);
12891 end Is_Tagged_Ancestor
;
12893 -- Start of processing for Check_Abstract_Primitives
12896 -- Loop over all of the formal derived type's primitives
12898 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
12899 while Present
(Gen_Elmt
) loop
12900 Gen_Subp
:= Node
(Gen_Elmt
);
12902 -- If the primitive of the formal is not abstract, then
12903 -- determine whether there is a corresponding primitive of
12904 -- the actual type that's abstract.
12906 if not Is_Abstract_Subprogram
(Gen_Subp
) then
12907 Act_Elmt
:= First_Elmt
(Act_Prims
);
12908 while Present
(Act_Elmt
) loop
12909 Act_Subp
:= Node
(Act_Elmt
);
12911 -- If we find an abstract primitive of the actual,
12912 -- then we need to test whether it corresponds to the
12913 -- subprogram from which the generic formal primitive
12916 if Is_Abstract_Subprogram
(Act_Subp
) then
12917 Anc_Subp
:= Alias
(Gen_Subp
);
12919 -- Test whether we have a corresponding primitive
12920 -- by comparing names, kinds, formal types, and
12923 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
12924 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
12926 Anc_Formal
:= First_Formal
(Anc_Subp
);
12927 Act_Formal
:= First_Formal
(Act_Subp
);
12928 while Present
(Anc_Formal
)
12929 and then Present
(Act_Formal
)
12931 Anc_F_Type
:= Etype
(Anc_Formal
);
12932 Act_F_Type
:= Etype
(Act_Formal
);
12934 if Ekind
(Anc_F_Type
) =
12935 E_Anonymous_Access_Type
12937 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
12939 if Ekind
(Act_F_Type
) =
12940 E_Anonymous_Access_Type
12943 Designated_Type
(Act_F_Type
);
12949 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
12954 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
12955 Act_F_Type
:= Base_Type
(Act_F_Type
);
12957 -- If the formal is controlling, then the
12958 -- the type of the actual primitive's formal
12959 -- must be derived directly or indirectly
12960 -- from the type of the ancestor primitive's
12963 if Is_Controlling_Formal
(Anc_Formal
) then
12964 if not Is_Tagged_Ancestor
12965 (Anc_F_Type
, Act_F_Type
)
12970 -- Otherwise the types of the formals must
12973 elsif Anc_F_Type
/= Act_F_Type
then
12977 Next_Entity
(Anc_Formal
);
12978 Next_Entity
(Act_Formal
);
12981 -- If we traversed through all of the formals
12982 -- then so far the subprograms correspond, so
12983 -- now check that any result types correspond.
12985 if No
(Anc_Formal
) and then No
(Act_Formal
) then
12986 Subprograms_Correspond
:= True;
12988 if Ekind
(Act_Subp
) = E_Function
then
12989 Anc_F_Type
:= Etype
(Anc_Subp
);
12990 Act_F_Type
:= Etype
(Act_Subp
);
12992 if Ekind
(Anc_F_Type
) =
12993 E_Anonymous_Access_Type
12996 Designated_Type
(Anc_F_Type
);
12998 if Ekind
(Act_F_Type
) =
12999 E_Anonymous_Access_Type
13002 Designated_Type
(Act_F_Type
);
13004 Subprograms_Correspond
:= False;
13009 = E_Anonymous_Access_Type
13011 Subprograms_Correspond
:= False;
13014 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
13015 Act_F_Type
:= Base_Type
(Act_F_Type
);
13017 -- Now either the result types must be
13018 -- the same or, if the result type is
13019 -- controlling, the result type of the
13020 -- actual primitive must descend from the
13021 -- result type of the ancestor primitive.
13023 if Subprograms_Correspond
13024 and then Anc_F_Type
/= Act_F_Type
13026 Has_Controlling_Result
(Anc_Subp
)
13027 and then not Is_Tagged_Ancestor
13028 (Anc_F_Type
, Act_F_Type
)
13030 Subprograms_Correspond
:= False;
13034 -- Found a matching subprogram belonging to
13035 -- formal ancestor type, so actual subprogram
13036 -- corresponds and this violates 3.9.3(9).
13038 if Subprograms_Correspond
then
13040 ("abstract subprogram & overrides "
13041 & "nonabstract subprogram of ancestor",
13048 Next_Elmt
(Act_Elmt
);
13052 Next_Elmt
(Gen_Elmt
);
13054 end Check_Abstract_Primitives
;
13057 -- Verify that limitedness matches. If parent is a limited
13058 -- interface then the generic formal is not unless declared
13059 -- explicitly so. If not declared limited, the actual cannot be
13060 -- limited (see AI05-0087).
13062 -- Even though this AI is a binding interpretation, we enable the
13063 -- check only in Ada 2012 mode, because this improper construct
13064 -- shows up in user code and in existing B-tests.
13066 if Is_Limited_Type
(Act_T
)
13067 and then not Is_Limited_Type
(A_Gen_T
)
13068 and then Ada_Version
>= Ada_2012
13070 if In_Instance
then
13074 ("actual for non-limited & cannot be a limited type",
13076 Explain_Limited_Type
(Act_T
, Actual
);
13077 Abandon_Instantiation
(Actual
);
13080 end Validate_Derived_Type_Instance
;
13082 ----------------------------------------
13083 -- Validate_Discriminated_Formal_Type --
13084 ----------------------------------------
13086 procedure Validate_Discriminated_Formal_Type
is
13087 Formal_Discr
: Entity_Id
;
13088 Actual_Discr
: Entity_Id
;
13089 Formal_Subt
: Entity_Id
;
13092 if Has_Discriminants
(A_Gen_T
) then
13093 if not Has_Discriminants
(Act_T
) then
13095 ("actual for & must have discriminants", Actual
, Gen_T
);
13096 Abandon_Instantiation
(Actual
);
13098 elsif Is_Constrained
(Act_T
) then
13100 ("actual for & must be unconstrained", Actual
, Gen_T
);
13101 Abandon_Instantiation
(Actual
);
13104 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
13105 Actual_Discr
:= First_Discriminant
(Act_T
);
13106 while Formal_Discr
/= Empty
loop
13107 if Actual_Discr
= Empty
then
13109 ("discriminants on actual do not match formal",
13111 Abandon_Instantiation
(Actual
);
13114 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
13116 -- Access discriminants match if designated types do
13118 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
13119 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
13120 E_Anonymous_Access_Type
13123 (Designated_Type
(Base_Type
(Formal_Subt
))) =
13124 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
13128 elsif Base_Type
(Formal_Subt
) /=
13129 Base_Type
(Etype
(Actual_Discr
))
13132 ("types of actual discriminants must match formal",
13134 Abandon_Instantiation
(Actual
);
13136 elsif not Subtypes_Statically_Match
13137 (Formal_Subt
, Etype
(Actual_Discr
))
13138 and then Ada_Version
>= Ada_95
13141 ("subtypes of actual discriminants must match formal",
13143 Abandon_Instantiation
(Actual
);
13146 Next_Discriminant
(Formal_Discr
);
13147 Next_Discriminant
(Actual_Discr
);
13150 if Actual_Discr
/= Empty
then
13152 ("discriminants on actual do not match formal",
13154 Abandon_Instantiation
(Actual
);
13158 end Validate_Discriminated_Formal_Type
;
13160 ---------------------------------------
13161 -- Validate_Incomplete_Type_Instance --
13162 ---------------------------------------
13164 procedure Validate_Incomplete_Type_Instance
is
13166 if not Is_Tagged_Type
(Act_T
)
13167 and then Is_Tagged_Type
(A_Gen_T
)
13170 ("actual for & must be a tagged type", Actual
, Gen_T
);
13173 Validate_Discriminated_Formal_Type
;
13174 end Validate_Incomplete_Type_Instance
;
13176 --------------------------------------
13177 -- Validate_Interface_Type_Instance --
13178 --------------------------------------
13180 procedure Validate_Interface_Type_Instance
is
13182 if not Is_Interface
(Act_T
) then
13184 ("actual for formal interface type must be an interface",
13187 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
13188 or else Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
13189 or else Is_Protected_Interface
(A_Gen_T
) /=
13190 Is_Protected_Interface
(Act_T
)
13191 or else Is_Synchronized_Interface
(A_Gen_T
) /=
13192 Is_Synchronized_Interface
(Act_T
)
13195 ("actual for interface& does not match (RM 12.5.5(4))",
13198 end Validate_Interface_Type_Instance
;
13200 ------------------------------------
13201 -- Validate_Private_Type_Instance --
13202 ------------------------------------
13204 procedure Validate_Private_Type_Instance
is
13206 if Is_Limited_Type
(Act_T
)
13207 and then not Is_Limited_Type
(A_Gen_T
)
13209 if In_Instance
then
13213 ("actual for non-limited & cannot be a limited type", Actual
,
13215 Explain_Limited_Type
(Act_T
, Actual
);
13216 Abandon_Instantiation
(Actual
);
13219 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
13220 and then not Has_Preelaborable_Initialization
(Act_T
)
13223 ("actual for & must have preelaborable initialization", Actual
,
13226 elsif not Is_Definite_Subtype
(Act_T
)
13227 and then Is_Definite_Subtype
(A_Gen_T
)
13228 and then Ada_Version
>= Ada_95
13231 ("actual for & must be a definite subtype", Actual
, Gen_T
);
13233 elsif not Is_Tagged_Type
(Act_T
)
13234 and then Is_Tagged_Type
(A_Gen_T
)
13237 ("actual for & must be a tagged type", Actual
, Gen_T
);
13240 Validate_Discriminated_Formal_Type
;
13242 end Validate_Private_Type_Instance
;
13244 -- Start of processing for Instantiate_Type
13247 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
13248 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
13249 return New_List
(Error
);
13251 elsif not Is_Entity_Name
(Actual
)
13252 or else not Is_Type
(Entity
(Actual
))
13255 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
13256 Abandon_Instantiation
(Actual
);
13259 Act_T
:= Entity
(Actual
);
13261 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
13262 -- as a generic actual parameter if the corresponding formal type
13263 -- does not have a known_discriminant_part, or is a formal derived
13264 -- type that is an Unchecked_Union type.
13266 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
13267 if not Has_Discriminants
(A_Gen_T
)
13268 or else (Is_Derived_Type
(A_Gen_T
)
13269 and then Is_Unchecked_Union
(A_Gen_T
))
13273 Error_Msg_N
("unchecked union cannot be the actual for a "
13274 & "discriminated formal type", Act_T
);
13279 -- Deal with fixed/floating restrictions
13281 if Is_Floating_Point_Type
(Act_T
) then
13282 Check_Restriction
(No_Floating_Point
, Actual
);
13283 elsif Is_Fixed_Point_Type
(Act_T
) then
13284 Check_Restriction
(No_Fixed_Point
, Actual
);
13287 -- Deal with error of using incomplete type as generic actual.
13288 -- This includes limited views of a type, even if the non-limited
13289 -- view may be available.
13291 if Ekind
(Act_T
) = E_Incomplete_Type
13292 or else (Is_Class_Wide_Type
(Act_T
)
13293 and then Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
13295 -- If the formal is an incomplete type, the actual can be
13296 -- incomplete as well.
13298 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
13301 elsif Is_Class_Wide_Type
(Act_T
)
13302 or else No
(Full_View
(Act_T
))
13304 Error_Msg_N
("premature use of incomplete type", Actual
);
13305 Abandon_Instantiation
(Actual
);
13307 Act_T
:= Full_View
(Act_T
);
13308 Set_Entity
(Actual
, Act_T
);
13310 if Has_Private_Component
(Act_T
) then
13312 ("premature use of type with private component", Actual
);
13316 -- Deal with error of premature use of private type as generic actual
13318 elsif Is_Private_Type
(Act_T
)
13319 and then Is_Private_Type
(Base_Type
(Act_T
))
13320 and then not Is_Generic_Type
(Act_T
)
13321 and then not Is_Derived_Type
(Act_T
)
13322 and then No
(Full_View
(Root_Type
(Act_T
)))
13324 -- If the formal is an incomplete type, the actual can be
13325 -- private or incomplete as well.
13327 if Ekind
(A_Gen_T
) = E_Incomplete_Type
then
13330 Error_Msg_N
("premature use of private type", Actual
);
13333 elsif Has_Private_Component
(Act_T
) then
13335 ("premature use of type with private component", Actual
);
13338 Set_Instance_Of
(A_Gen_T
, Act_T
);
13340 -- If the type is generic, the class-wide type may also be used
13342 if Is_Tagged_Type
(A_Gen_T
)
13343 and then Is_Tagged_Type
(Act_T
)
13344 and then not Is_Class_Wide_Type
(A_Gen_T
)
13346 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
13347 Class_Wide_Type
(Act_T
));
13350 if not Is_Abstract_Type
(A_Gen_T
)
13351 and then Is_Abstract_Type
(Act_T
)
13354 ("actual of non-abstract formal cannot be abstract", Actual
);
13357 -- A generic scalar type is a first subtype for which we generate
13358 -- an anonymous base type. Indicate that the instance of this base
13359 -- is the base type of the actual.
13361 if Is_Scalar_Type
(A_Gen_T
) then
13362 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
13366 if Error_Posted
(Act_T
) then
13369 case Nkind
(Def
) is
13370 when N_Formal_Private_Type_Definition
=>
13371 Validate_Private_Type_Instance
;
13373 when N_Formal_Incomplete_Type_Definition
=>
13374 Validate_Incomplete_Type_Instance
;
13376 when N_Formal_Derived_Type_Definition
=>
13377 Validate_Derived_Type_Instance
;
13379 when N_Formal_Discrete_Type_Definition
=>
13380 if not Is_Discrete_Type
(Act_T
) then
13382 ("expect discrete type in instantiation of&",
13384 Abandon_Instantiation
(Actual
);
13387 Diagnose_Predicated_Actual
;
13389 when N_Formal_Signed_Integer_Type_Definition
=>
13390 if not Is_Signed_Integer_Type
(Act_T
) then
13392 ("expect signed integer type in instantiation of&",
13394 Abandon_Instantiation
(Actual
);
13397 Diagnose_Predicated_Actual
;
13399 when N_Formal_Modular_Type_Definition
=>
13400 if not Is_Modular_Integer_Type
(Act_T
) then
13402 ("expect modular type in instantiation of &",
13404 Abandon_Instantiation
(Actual
);
13407 Diagnose_Predicated_Actual
;
13409 when N_Formal_Floating_Point_Definition
=>
13410 if not Is_Floating_Point_Type
(Act_T
) then
13412 ("expect float type in instantiation of &", Actual
, Gen_T
);
13413 Abandon_Instantiation
(Actual
);
13416 when N_Formal_Ordinary_Fixed_Point_Definition
=>
13417 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
13419 ("expect ordinary fixed point type in instantiation of &",
13421 Abandon_Instantiation
(Actual
);
13424 when N_Formal_Decimal_Fixed_Point_Definition
=>
13425 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
13427 ("expect decimal type in instantiation of &",
13429 Abandon_Instantiation
(Actual
);
13432 when N_Array_Type_Definition
=>
13433 Validate_Array_Type_Instance
;
13435 when N_Access_To_Object_Definition
=>
13436 Validate_Access_Type_Instance
;
13438 when N_Access_Function_Definition
13439 | N_Access_Procedure_Definition
13441 Validate_Access_Subprogram_Instance
;
13443 when N_Record_Definition
=>
13444 Validate_Interface_Type_Instance
;
13446 when N_Derived_Type_Definition
=>
13447 Validate_Derived_Interface_Type_Instance
;
13450 raise Program_Error
;
13454 Subt
:= New_Copy
(Gen_T
);
13456 -- Use adjusted sloc of subtype name as the location for other nodes in
13457 -- the subtype declaration.
13459 Loc
:= Sloc
(Subt
);
13462 Make_Subtype_Declaration
(Loc
,
13463 Defining_Identifier
=> Subt
,
13464 Subtype_Indication
=> New_Occurrence_Of
(Act_T
, Loc
));
13466 if Is_Private_Type
(Act_T
) then
13467 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
13469 elsif Is_Access_Type
(Act_T
)
13470 and then Is_Private_Type
(Designated_Type
(Act_T
))
13472 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
13475 -- In Ada 2012 the actual may be a limited view. Indicate that
13476 -- the local subtype must be treated as such.
13478 if From_Limited_With
(Act_T
) then
13479 Set_Ekind
(Subt
, E_Incomplete_Subtype
);
13480 Set_From_Limited_With
(Subt
);
13483 Decl_Nodes
:= New_List
(Decl_Node
);
13485 -- Flag actual derived types so their elaboration produces the
13486 -- appropriate renamings for the primitive operations of the ancestor.
13487 -- Flag actual for formal private types as well, to determine whether
13488 -- operations in the private part may override inherited operations.
13489 -- If the formal has an interface list, the ancestor is not the
13490 -- parent, but the analyzed formal that includes the interface
13491 -- operations of all its progenitors.
13493 -- Same treatment for formal private types, so we can check whether the
13494 -- type is tagged limited when validating derivations in the private
13495 -- part. (See AI05-096).
13497 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
13498 if Present
(Interface_List
(Def
)) then
13499 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
13501 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
13504 elsif Nkind_In
(Def
, N_Formal_Private_Type_Definition
,
13505 N_Formal_Incomplete_Type_Definition
)
13507 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
13510 -- If the actual is a synchronized type that implements an interface,
13511 -- the primitive operations are attached to the corresponding record,
13512 -- and we have to treat it as an additional generic actual, so that its
13513 -- primitive operations become visible in the instance. The task or
13514 -- protected type itself does not carry primitive operations.
13516 if Is_Concurrent_Type
(Act_T
)
13517 and then Is_Tagged_Type
(Act_T
)
13518 and then Present
(Corresponding_Record_Type
(Act_T
))
13519 and then Present
(Ancestor
)
13520 and then Is_Interface
(Ancestor
)
13523 Corr_Rec
: constant Entity_Id
:=
13524 Corresponding_Record_Type
(Act_T
);
13525 New_Corr
: Entity_Id
;
13526 Corr_Decl
: Node_Id
;
13529 New_Corr
:= Make_Temporary
(Loc
, 'S');
13531 Make_Subtype_Declaration
(Loc
,
13532 Defining_Identifier
=> New_Corr
,
13533 Subtype_Indication
=>
13534 New_Occurrence_Of
(Corr_Rec
, Loc
));
13535 Append_To
(Decl_Nodes
, Corr_Decl
);
13537 if Ekind
(Act_T
) = E_Task_Type
then
13538 Set_Ekind
(Subt
, E_Task_Subtype
);
13540 Set_Ekind
(Subt
, E_Protected_Subtype
);
13543 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
13544 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
13545 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
13549 -- For a floating-point type, capture dimension info if any, because
13550 -- the generated subtype declaration does not come from source and
13551 -- will not process dimensions.
13553 if Is_Floating_Point_Type
(Act_T
) then
13554 Copy_Dimensions
(Act_T
, Subt
);
13558 end Instantiate_Type
;
13560 ---------------------
13561 -- Is_In_Main_Unit --
13562 ---------------------
13564 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
13565 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
13566 Current_Unit
: Node_Id
;
13569 if Unum
= Main_Unit
then
13572 -- If the current unit is a subunit then it is either the main unit or
13573 -- is being compiled as part of the main unit.
13575 elsif Nkind
(N
) = N_Compilation_Unit
then
13576 return Nkind
(Unit
(N
)) = N_Subunit
;
13579 Current_Unit
:= Parent
(N
);
13580 while Present
(Current_Unit
)
13581 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
13583 Current_Unit
:= Parent
(Current_Unit
);
13586 -- The instantiation node is in the main unit, or else the current node
13587 -- (perhaps as the result of nested instantiations) is in the main unit,
13588 -- or in the declaration of the main unit, which in this last case must
13592 Current_Unit
= Cunit
(Main_Unit
)
13593 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
13594 or else (Present
(Current_Unit
)
13595 and then Present
(Library_Unit
(Current_Unit
))
13596 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
13597 end Is_In_Main_Unit
;
13599 ----------------------------
13600 -- Load_Parent_Of_Generic --
13601 ----------------------------
13603 procedure Load_Parent_Of_Generic
13606 Body_Optional
: Boolean := False)
13608 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
13609 Saved_Style_Check
: constant Boolean := Style_Check
;
13610 Saved_Warnings
: constant Warning_Record
:= Save_Warnings
;
13611 True_Parent
: Node_Id
;
13612 Inst_Node
: Node_Id
;
13614 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
13616 procedure Collect_Previous_Instances
(Decls
: List_Id
);
13617 -- Collect all instantiations in the given list of declarations, that
13618 -- precede the generic that we need to load. If the bodies of these
13619 -- instantiations are available, we must analyze them, to ensure that
13620 -- the public symbols generated are the same when the unit is compiled
13621 -- to generate code, and when it is compiled in the context of a unit
13622 -- that needs a particular nested instance. This process is applied to
13623 -- both package and subprogram instances.
13625 --------------------------------
13626 -- Collect_Previous_Instances --
13627 --------------------------------
13629 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
13633 Decl
:= First
(Decls
);
13634 while Present
(Decl
) loop
13635 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
13638 -- If Decl is an instantiation, then record it as requiring
13639 -- instantiation of the corresponding body, except if it is an
13640 -- abbreviated instantiation generated internally for conformance
13641 -- checking purposes only for the case of a formal package
13642 -- declared without a box (see Instantiate_Formal_Package). Such
13643 -- an instantiation does not generate any code (the actual code
13644 -- comes from actual) and thus does not need to be analyzed here.
13645 -- If the instantiation appears with a generic package body it is
13646 -- not analyzed here either.
13648 elsif Nkind
(Decl
) = N_Package_Instantiation
13649 and then not Is_Internal
(Defining_Entity
(Decl
))
13651 Append_Elmt
(Decl
, Previous_Instances
);
13653 -- For a subprogram instantiation, omit instantiations intrinsic
13654 -- operations (Unchecked_Conversions, etc.) that have no bodies.
13656 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
13657 N_Procedure_Instantiation
)
13658 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
13660 Append_Elmt
(Decl
, Previous_Instances
);
13662 elsif Nkind
(Decl
) = N_Package_Declaration
then
13663 Collect_Previous_Instances
13664 (Visible_Declarations
(Specification
(Decl
)));
13665 Collect_Previous_Instances
13666 (Private_Declarations
(Specification
(Decl
)));
13668 -- Previous non-generic bodies may contain instances as well
13670 elsif Nkind
(Decl
) = N_Package_Body
13671 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
13673 Collect_Previous_Instances
(Declarations
(Decl
));
13675 elsif Nkind
(Decl
) = N_Subprogram_Body
13676 and then not Acts_As_Spec
(Decl
)
13677 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
13679 Collect_Previous_Instances
(Declarations
(Decl
));
13684 end Collect_Previous_Instances
;
13686 -- Start of processing for Load_Parent_Of_Generic
13689 if not In_Same_Source_Unit
(N
, Spec
)
13690 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
13691 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
13692 and then not Is_In_Main_Unit
(Spec
))
13694 -- Find body of parent of spec, and analyze it. A special case arises
13695 -- when the parent is an instantiation, that is to say when we are
13696 -- currently instantiating a nested generic. In that case, there is
13697 -- no separate file for the body of the enclosing instance. Instead,
13698 -- the enclosing body must be instantiated as if it were a pending
13699 -- instantiation, in order to produce the body for the nested generic
13700 -- we require now. Note that in that case the generic may be defined
13701 -- in a package body, the instance defined in the same package body,
13702 -- and the original enclosing body may not be in the main unit.
13704 Inst_Node
:= Empty
;
13706 True_Parent
:= Parent
(Spec
);
13707 while Present
(True_Parent
)
13708 and then Nkind
(True_Parent
) /= N_Compilation_Unit
13710 if Nkind
(True_Parent
) = N_Package_Declaration
13712 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
13714 -- Parent is a compilation unit that is an instantiation.
13715 -- Instantiation node has been replaced with package decl.
13717 Inst_Node
:= Original_Node
(True_Parent
);
13720 elsif Nkind
(True_Parent
) = N_Package_Declaration
13721 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
13722 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
13724 -- Parent is an instantiation within another specification.
13725 -- Declaration for instance has been inserted before original
13726 -- instantiation node. A direct link would be preferable?
13728 Inst_Node
:= Next
(True_Parent
);
13729 while Present
(Inst_Node
)
13730 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
13735 -- If the instance appears within a generic, and the generic
13736 -- unit is defined within a formal package of the enclosing
13737 -- generic, there is no generic body available, and none
13738 -- needed. A more precise test should be used ???
13740 if No
(Inst_Node
) then
13747 True_Parent
:= Parent
(True_Parent
);
13751 -- Case where we are currently instantiating a nested generic
13753 if Present
(Inst_Node
) then
13754 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
13756 -- Instantiation node and declaration of instantiated package
13757 -- were exchanged when only the declaration was needed.
13758 -- Restore instantiation node before proceeding with body.
13760 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
13763 -- Now complete instantiation of enclosing body, if it appears in
13764 -- some other unit. If it appears in the current unit, the body
13765 -- will have been instantiated already.
13767 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
13769 -- We need to determine the expander mode to instantiate the
13770 -- enclosing body. Because the generic body we need may use
13771 -- global entities declared in the enclosing package (including
13772 -- aggregates) it is in general necessary to compile this body
13773 -- with expansion enabled, except if we are within a generic
13774 -- package, in which case the usual generic rule applies.
13777 Exp_Status
: Boolean := True;
13781 -- Loop through scopes looking for generic package
13783 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
13784 while Present
(Scop
)
13785 and then Scop
/= Standard_Standard
13787 if Ekind
(Scop
) = E_Generic_Package
then
13788 Exp_Status
:= False;
13792 Scop
:= Scope
(Scop
);
13795 -- Collect previous instantiations in the unit that contains
13796 -- the desired generic.
13798 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
13799 and then not Body_Optional
13803 Info
: Pending_Body_Info
;
13807 Par
:= Parent
(Inst_Node
);
13808 while Present
(Par
) loop
13809 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
13810 Par
:= Parent
(Par
);
13813 pragma Assert
(Present
(Par
));
13815 if Nkind
(Par
) = N_Package_Body
then
13816 Collect_Previous_Instances
(Declarations
(Par
));
13818 elsif Nkind
(Par
) = N_Package_Declaration
then
13819 Collect_Previous_Instances
13820 (Visible_Declarations
(Specification
(Par
)));
13821 Collect_Previous_Instances
13822 (Private_Declarations
(Specification
(Par
)));
13825 -- Enclosing unit is a subprogram body. In this
13826 -- case all instance bodies are processed in order
13827 -- and there is no need to collect them separately.
13832 Decl
:= First_Elmt
(Previous_Instances
);
13833 while Present
(Decl
) loop
13836 Instance_Spec
(Node
(Decl
)),
13837 Config_Switches
=> Save_Config_Switches
,
13838 Current_Sem_Unit
=>
13839 Get_Code_Unit
(Sloc
(Node
(Decl
))),
13840 Expander_Status
=> Exp_Status
,
13841 Inst_Node
=> Node
(Decl
),
13842 Local_Suppress_Stack_Top
=>
13843 Local_Suppress_Stack_Top
,
13844 Scope_Suppress
=> Scope_Suppress
,
13845 Warnings
=> Save_Warnings
);
13847 -- Package instance
13849 if Nkind
(Node
(Decl
)) = N_Package_Instantiation
13851 Instantiate_Package_Body
13852 (Info
, Body_Optional
=> True);
13854 -- Subprogram instance
13857 -- The instance_spec is in the wrapper package,
13858 -- usually followed by its local renaming
13859 -- declaration. See Build_Subprogram_Renaming
13860 -- for details. If the instance carries aspects,
13861 -- these result in the corresponding pragmas,
13862 -- inserted after the subprogram declaration.
13863 -- They must be skipped as well when retrieving
13864 -- the desired spec. Some of them may have been
13865 -- rewritten as null statements.
13866 -- A direct link would be more robust ???
13870 (Last
(Visible_Declarations
13871 (Specification
(Info
.Act_Decl
))));
13873 while Nkind_In
(Decl
,
13876 N_Subprogram_Renaming_Declaration
)
13878 Decl
:= Prev
(Decl
);
13881 Info
.Act_Decl
:= Decl
;
13884 Instantiate_Subprogram_Body
13885 (Info
, Body_Optional
=> True);
13893 Instantiate_Package_Body
13895 ((Act_Decl
=> True_Parent
,
13896 Config_Switches
=> Save_Config_Switches
,
13897 Current_Sem_Unit
=>
13898 Get_Code_Unit
(Sloc
(Inst_Node
)),
13899 Expander_Status
=> Exp_Status
,
13900 Inst_Node
=> Inst_Node
,
13901 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
13902 Scope_Suppress
=> Scope_Suppress
,
13903 Warnings
=> Save_Warnings
)),
13904 Body_Optional
=> Body_Optional
);
13908 -- Case where we are not instantiating a nested generic
13911 Opt
.Style_Check
:= False;
13912 Expander_Mode_Save_And_Set
(True);
13913 Load_Needed_Body
(Comp_Unit
, OK
);
13914 Opt
.Style_Check
:= Saved_Style_Check
;
13915 Restore_Warnings
(Saved_Warnings
);
13916 Expander_Mode_Restore
;
13919 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
13920 and then not Body_Optional
13923 Bname
: constant Unit_Name_Type
:=
13924 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
13927 -- In CodePeer mode, the missing body may make the analysis
13928 -- incomplete, but we do not treat it as fatal.
13930 if CodePeer_Mode
then
13934 Error_Msg_Unit_1
:= Bname
;
13935 Error_Msg_N
("this instantiation requires$!", N
);
13936 Error_Msg_File_1
:=
13937 Get_File_Name
(Bname
, Subunit
=> False);
13938 Error_Msg_N
("\but file{ was not found!", N
);
13939 raise Unrecoverable_Error
;
13946 -- If loading parent of the generic caused an instantiation circularity,
13947 -- we abandon compilation at this point, because otherwise in some cases
13948 -- we get into trouble with infinite recursions after this point.
13950 if Circularity_Detected
then
13951 raise Unrecoverable_Error
;
13953 end Load_Parent_Of_Generic
;
13955 ---------------------------------
13956 -- Map_Formal_Package_Entities --
13957 ---------------------------------
13959 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
13964 Set_Instance_Of
(Form
, Act
);
13966 -- Traverse formal and actual package to map the corresponding entities.
13967 -- We skip over internal entities that may be generated during semantic
13968 -- analysis, and find the matching entities by name, given that they
13969 -- must appear in the same order.
13971 E1
:= First_Entity
(Form
);
13972 E2
:= First_Entity
(Act
);
13973 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
13974 -- Could this test be a single condition??? Seems like it could, and
13975 -- isn't FPE (Form) a constant anyway???
13977 if not Is_Internal
(E1
)
13978 and then Present
(Parent
(E1
))
13979 and then not Is_Class_Wide_Type
(E1
)
13980 and then not Is_Internal_Name
(Chars
(E1
))
13982 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
13989 Set_Instance_Of
(E1
, E2
);
13991 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
13992 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
13995 if Is_Constrained
(E1
) then
13996 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
13999 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
14000 Map_Formal_Package_Entities
(E1
, E2
);
14007 end Map_Formal_Package_Entities
;
14009 -----------------------
14010 -- Move_Freeze_Nodes --
14011 -----------------------
14013 procedure Move_Freeze_Nodes
14014 (Out_Of
: Entity_Id
;
14019 Next_Decl
: Node_Id
;
14020 Next_Node
: Node_Id
:= After
;
14023 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
14024 -- Check whether entity is declared in a scope external to that of the
14027 -------------------
14028 -- Is_Outer_Type --
14029 -------------------
14031 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
14032 Scop
: Entity_Id
:= Scope
(T
);
14035 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
14039 while Scop
/= Standard_Standard
loop
14040 if Scop
= Out_Of
then
14043 Scop
:= Scope
(Scop
);
14051 -- Start of processing for Move_Freeze_Nodes
14058 -- First remove the freeze nodes that may appear before all other
14062 while Present
(Decl
)
14063 and then Nkind
(Decl
) = N_Freeze_Entity
14064 and then Is_Outer_Type
(Entity
(Decl
))
14066 Decl
:= Remove_Head
(L
);
14067 Insert_After
(Next_Node
, Decl
);
14068 Set_Analyzed
(Decl
, False);
14073 -- Next scan the list of declarations and remove each freeze node that
14074 -- appears ahead of the current node.
14076 while Present
(Decl
) loop
14077 while Present
(Next
(Decl
))
14078 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
14079 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
14081 Next_Decl
:= Remove_Next
(Decl
);
14082 Insert_After
(Next_Node
, Next_Decl
);
14083 Set_Analyzed
(Next_Decl
, False);
14084 Next_Node
:= Next_Decl
;
14087 -- If the declaration is a nested package or concurrent type, then
14088 -- recurse. Nested generic packages will have been processed from the
14091 case Nkind
(Decl
) is
14092 when N_Package_Declaration
=>
14093 Spec
:= Specification
(Decl
);
14095 when N_Task_Type_Declaration
=>
14096 Spec
:= Task_Definition
(Decl
);
14098 when N_Protected_Type_Declaration
=>
14099 Spec
:= Protected_Definition
(Decl
);
14105 if Present
(Spec
) then
14106 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
14107 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
14112 end Move_Freeze_Nodes
;
14118 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
14120 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
14123 ------------------------
14124 -- Preanalyze_Actuals --
14125 ------------------------
14127 procedure Preanalyze_Actuals
(N
: Node_Id
; Inst
: Entity_Id
:= Empty
) is
14128 procedure Perform_Appropriate_Analysis
(N
: Node_Id
);
14129 -- Determine if the actuals we are analyzing come from a generic
14130 -- instantiation that is a library unit and dispatch accordingly.
14132 ----------------------------------
14133 -- Perform_Appropriate_Analysis --
14134 ----------------------------------
14136 procedure Perform_Appropriate_Analysis
(N
: Node_Id
) is
14138 -- When we have a library instantiation we cannot allow any expansion
14139 -- to occur, since there may be no place to put it. Instead, in that
14140 -- case we perform a preanalysis of the actual.
14142 if Present
(Inst
) and then Is_Compilation_Unit
(Inst
) then
14147 end Perform_Appropriate_Analysis
;
14151 Errs
: constant Nat
:= Serious_Errors_Detected
;
14156 Cur
: Entity_Id
:= Empty
;
14157 -- Current homograph of the instance name
14159 Vis
: Boolean := False;
14160 -- Saved visibility status of the current homograph
14162 -- Start of processing for Preanalyze_Actuals
14165 Assoc
:= First
(Generic_Associations
(N
));
14167 -- If the instance is a child unit, its name may hide an outer homonym,
14168 -- so make it invisible to perform name resolution on the actuals.
14170 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
14172 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
14174 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
14176 if Is_Compilation_Unit
(Cur
) then
14177 Vis
:= Is_Immediately_Visible
(Cur
);
14178 Set_Is_Immediately_Visible
(Cur
, False);
14184 while Present
(Assoc
) loop
14185 if Nkind
(Assoc
) /= N_Others_Choice
then
14186 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
14188 -- Within a nested instantiation, a defaulted actual is an empty
14189 -- association, so nothing to analyze. If the subprogram actual
14190 -- is an attribute, analyze prefix only, because actual is not a
14191 -- complete attribute reference.
14193 -- If actual is an allocator, analyze expression only. The full
14194 -- analysis can generate code, and if instance is a compilation
14195 -- unit we have to wait until the package instance is installed
14196 -- to have a proper place to insert this code.
14198 -- String literals may be operators, but at this point we do not
14199 -- know whether the actual is a formal subprogram or a string.
14204 elsif Nkind
(Act
) = N_Attribute_Reference
then
14205 Perform_Appropriate_Analysis
(Prefix
(Act
));
14207 elsif Nkind
(Act
) = N_Explicit_Dereference
then
14208 Perform_Appropriate_Analysis
(Prefix
(Act
));
14210 elsif Nkind
(Act
) = N_Allocator
then
14212 Expr
: constant Node_Id
:= Expression
(Act
);
14215 if Nkind
(Expr
) = N_Subtype_Indication
then
14216 Perform_Appropriate_Analysis
(Subtype_Mark
(Expr
));
14218 -- Analyze separately each discriminant constraint, when
14219 -- given with a named association.
14225 Constr
:= First
(Constraints
(Constraint
(Expr
)));
14226 while Present
(Constr
) loop
14227 if Nkind
(Constr
) = N_Discriminant_Association
then
14228 Perform_Appropriate_Analysis
14229 (Expression
(Constr
));
14231 Perform_Appropriate_Analysis
(Constr
);
14239 Perform_Appropriate_Analysis
(Expr
);
14243 elsif Nkind
(Act
) /= N_Operator_Symbol
then
14244 Perform_Appropriate_Analysis
(Act
);
14246 -- Within a package instance, mark actuals that are limited
14247 -- views, so their use can be moved to the body of the
14250 if Is_Entity_Name
(Act
)
14251 and then Is_Type
(Entity
(Act
))
14252 and then From_Limited_With
(Entity
(Act
))
14253 and then Present
(Inst
)
14255 Append_Elmt
(Entity
(Act
), Incomplete_Actuals
(Inst
));
14259 if Errs
/= Serious_Errors_Detected
then
14261 -- Do a minimal analysis of the generic, to prevent spurious
14262 -- warnings complaining about the generic being unreferenced,
14263 -- before abandoning the instantiation.
14265 Perform_Appropriate_Analysis
(Name
(N
));
14267 if Is_Entity_Name
(Name
(N
))
14268 and then Etype
(Name
(N
)) /= Any_Type
14270 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
14271 Set_Is_Instantiated
(Entity
(Name
(N
)));
14274 if Present
(Cur
) then
14276 -- For the case of a child instance hiding an outer homonym,
14277 -- provide additional warning which might explain the error.
14279 Set_Is_Immediately_Visible
(Cur
, Vis
);
14281 ("& hides outer unit with the same name??",
14282 N
, Defining_Unit_Name
(N
));
14285 Abandon_Instantiation
(Act
);
14292 if Present
(Cur
) then
14293 Set_Is_Immediately_Visible
(Cur
, Vis
);
14295 end Preanalyze_Actuals
;
14297 -------------------------------
14298 -- Provide_Completing_Bodies --
14299 -------------------------------
14301 procedure Provide_Completing_Bodies
(N
: Node_Id
) is
14302 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
);
14303 -- Generate the completing body for subprogram declaration Subp_Decl
14305 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
);
14306 -- Generating completing bodies for all subprograms found in declarative
14309 ---------------------------
14310 -- Build_Completing_Body --
14311 ---------------------------
14313 procedure Build_Completing_Body
(Subp_Decl
: Node_Id
) is
14314 Loc
: constant Source_Ptr
:= Sloc
(Subp_Decl
);
14315 Subp_Id
: constant Entity_Id
:= Defining_Entity
(Subp_Decl
);
14319 -- Nothing to do if the subprogram already has a completing body
14321 if Present
(Corresponding_Body
(Subp_Decl
)) then
14324 -- Mark the function as having a valid return statement even though
14325 -- the body contains a single raise statement.
14327 elsif Ekind
(Subp_Id
) = E_Function
then
14328 Set_Return_Present
(Subp_Id
);
14331 -- Clone the specification to obtain new entities and reset the only
14334 Spec
:= Copy_Subprogram_Spec
(Specification
(Subp_Decl
));
14335 Set_Generic_Parent
(Spec
, Empty
);
14338 -- function Func ... return ... is
14340 -- procedure Proc ... is
14342 -- raise Program_Error with "access before elaboration";
14345 Insert_After_And_Analyze
(Subp_Decl
,
14346 Make_Subprogram_Body
(Loc
,
14347 Specification
=> Spec
,
14348 Declarations
=> New_List
,
14349 Handled_Statement_Sequence
=>
14350 Make_Handled_Sequence_Of_Statements
(Loc
,
14351 Statements
=> New_List
(
14352 Make_Raise_Program_Error
(Loc
,
14353 Reason
=> PE_Access_Before_Elaboration
)))));
14354 end Build_Completing_Body
;
14356 ----------------------------------
14357 -- Provide_Completing_Bodies_In --
14358 ----------------------------------
14360 procedure Provide_Completing_Bodies_In
(Decls
: List_Id
) is
14364 if Present
(Decls
) then
14365 Decl
:= First
(Decls
);
14366 while Present
(Decl
) loop
14367 Provide_Completing_Bodies
(Decl
);
14371 end Provide_Completing_Bodies_In
;
14377 -- Start of processing for Provide_Completing_Bodies
14380 if Nkind
(N
) = N_Package_Declaration
then
14381 Spec
:= Specification
(N
);
14383 Push_Scope
(Defining_Entity
(N
));
14384 Provide_Completing_Bodies_In
(Visible_Declarations
(Spec
));
14385 Provide_Completing_Bodies_In
(Private_Declarations
(Spec
));
14388 elsif Nkind
(N
) = N_Subprogram_Declaration
then
14389 Build_Completing_Body
(N
);
14391 end Provide_Completing_Bodies
;
14393 -------------------
14394 -- Remove_Parent --
14395 -------------------
14397 procedure Remove_Parent
(In_Body
: Boolean := False) is
14398 S
: Entity_Id
:= Current_Scope
;
14399 -- S is the scope containing the instantiation just completed. The scope
14400 -- stack contains the parent instances of the instantiation, followed by
14409 -- After child instantiation is complete, remove from scope stack the
14410 -- extra copy of the current scope, and then remove parent instances.
14412 if not In_Body
then
14415 while Current_Scope
/= S
loop
14416 P
:= Current_Scope
;
14417 End_Package_Scope
(Current_Scope
);
14419 if In_Open_Scopes
(P
) then
14420 E
:= First_Entity
(P
);
14421 while Present
(E
) loop
14422 Set_Is_Immediately_Visible
(E
, True);
14426 -- If instantiation is declared in a block, it is the enclosing
14427 -- scope that might be a parent instance. Note that only one
14428 -- block can be involved, because the parent instances have
14429 -- been installed within it.
14431 if Ekind
(P
) = E_Block
then
14432 Cur_P
:= Scope
(P
);
14437 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
14438 -- We are within an instance of some sibling. Retain
14439 -- visibility of parent, for proper subsequent cleanup, and
14440 -- reinstall private declarations as well.
14442 Set_In_Private_Part
(P
);
14443 Install_Private_Declarations
(P
);
14446 -- If the ultimate parent is a top-level unit recorded in
14447 -- Instance_Parent_Unit, then reset its visibility to what it was
14448 -- before instantiation. (It's not clear what the purpose is of
14449 -- testing whether Scope (P) is In_Open_Scopes, but that test was
14450 -- present before the ultimate parent test was added.???)
14452 elsif not In_Open_Scopes
(Scope
(P
))
14453 or else (P
= Instance_Parent_Unit
14454 and then not Parent_Unit_Visible
)
14456 Set_Is_Immediately_Visible
(P
, False);
14458 -- If the current scope is itself an instantiation of a generic
14459 -- nested within P, and we are in the private part of body of this
14460 -- instantiation, restore the full views of P, that were removed
14461 -- in End_Package_Scope above. This obscure case can occur when a
14462 -- subunit of a generic contains an instance of a child unit of
14463 -- its generic parent unit.
14465 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
14467 Par
: constant Entity_Id
:=
14468 Generic_Parent
(Package_Specification
(S
));
14471 and then P
= Scope
(Par
)
14472 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
14474 Set_In_Private_Part
(P
);
14475 Install_Private_Declarations
(P
);
14481 -- Reset visibility of entities in the enclosing scope
14483 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
14485 Hidden
:= First_Elmt
(Hidden_Entities
);
14486 while Present
(Hidden
) loop
14487 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
14488 Next_Elmt
(Hidden
);
14492 -- Each body is analyzed separately, and there is no context that
14493 -- needs preserving from one body instance to the next, so remove all
14494 -- parent scopes that have been installed.
14496 while Present
(S
) loop
14497 End_Package_Scope
(S
);
14498 Set_Is_Immediately_Visible
(S
, False);
14499 S
:= Current_Scope
;
14500 exit when S
= Standard_Standard
;
14509 procedure Restore_Env
is
14510 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
14513 if No
(Current_Instantiated_Parent
.Act_Id
) then
14514 -- Restore environment after subprogram inlining
14516 Restore_Private_Views
(Empty
);
14519 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
14520 Exchanged_Views
:= Saved
.Exchanged_Views
;
14521 Hidden_Entities
:= Saved
.Hidden_Entities
;
14522 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
14523 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
14524 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
14526 Restore_Config_Switches
(Saved
.Switches
);
14528 Instance_Envs
.Decrement_Last
;
14531 ---------------------------
14532 -- Restore_Private_Views --
14533 ---------------------------
14535 procedure Restore_Private_Views
14536 (Pack_Id
: Entity_Id
;
14537 Is_Package
: Boolean := True)
14542 Dep_Elmt
: Elmt_Id
;
14545 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
14546 -- Hide the generic formals of formal packages declared with box which
14547 -- were reachable in the current instantiation.
14549 ---------------------------
14550 -- Restore_Nested_Formal --
14551 ---------------------------
14553 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
14557 if Present
(Renamed_Object
(Formal
))
14558 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
14562 elsif Present
(Associated_Formal_Package
(Formal
)) then
14563 Ent
:= First_Entity
(Formal
);
14564 while Present
(Ent
) loop
14565 exit when Ekind
(Ent
) = E_Package
14566 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
14568 Set_Is_Hidden
(Ent
);
14569 Set_Is_Potentially_Use_Visible
(Ent
, False);
14571 -- If package, then recurse
14573 if Ekind
(Ent
) = E_Package
then
14574 Restore_Nested_Formal
(Ent
);
14580 end Restore_Nested_Formal
;
14582 -- Start of processing for Restore_Private_Views
14585 M
:= First_Elmt
(Exchanged_Views
);
14586 while Present
(M
) loop
14589 -- Subtypes of types whose views have been exchanged, and that are
14590 -- defined within the instance, were not on the Private_Dependents
14591 -- list on entry to the instance, so they have to be exchanged
14592 -- explicitly now, in order to remain consistent with the view of the
14595 if Ekind_In
(Typ
, E_Private_Type
,
14596 E_Limited_Private_Type
,
14597 E_Record_Type_With_Private
)
14599 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
14600 while Present
(Dep_Elmt
) loop
14601 Dep_Typ
:= Node
(Dep_Elmt
);
14603 if Scope
(Dep_Typ
) = Pack_Id
14604 and then Present
(Full_View
(Dep_Typ
))
14606 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
14607 Exchange_Declarations
(Dep_Typ
);
14610 Next_Elmt
(Dep_Elmt
);
14614 Exchange_Declarations
(Node
(M
));
14618 if No
(Pack_Id
) then
14622 -- Make the generic formal parameters private, and make the formal types
14623 -- into subtypes of the actuals again.
14625 E
:= First_Entity
(Pack_Id
);
14626 while Present
(E
) loop
14627 Set_Is_Hidden
(E
, True);
14630 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
14632 -- If the actual for E is itself a generic actual type from
14633 -- an enclosing instance, E is still a generic actual type
14634 -- outside of the current instance. This matter when resolving
14635 -- an overloaded call that may be ambiguous in the enclosing
14636 -- instance, when two of its actuals coincide.
14638 if Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
14639 and then Is_Generic_Actual_Type
14640 (Entity
(Subtype_Indication
(Parent
(E
))))
14644 Set_Is_Generic_Actual_Type
(E
, False);
14647 -- An unusual case of aliasing: the actual may also be directly
14648 -- visible in the generic, and be private there, while it is fully
14649 -- visible in the context of the instance. The internal subtype
14650 -- is private in the instance but has full visibility like its
14651 -- parent in the enclosing scope. This enforces the invariant that
14652 -- the privacy status of all private dependents of a type coincide
14653 -- with that of the parent type. This can only happen when a
14654 -- generic child unit is instantiated within a sibling.
14656 if Is_Private_Type
(E
)
14657 and then not Is_Private_Type
(Etype
(E
))
14659 Exchange_Declarations
(E
);
14662 elsif Ekind
(E
) = E_Package
then
14664 -- The end of the renaming list is the renaming of the generic
14665 -- package itself. If the instance is a subprogram, all entities
14666 -- in the corresponding package are renamings. If this entity is
14667 -- a formal package, make its own formals private as well. The
14668 -- actual in this case is itself the renaming of an instantiation.
14669 -- If the entity is not a package renaming, it is the entity
14670 -- created to validate formal package actuals: ignore it.
14672 -- If the actual is itself a formal package for the enclosing
14673 -- generic, or the actual for such a formal package, it remains
14674 -- visible on exit from the instance, and therefore nothing needs
14675 -- to be done either, except to keep it accessible.
14677 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
14680 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
14684 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
14686 Set_Is_Hidden
(E
, False);
14690 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
14694 Id
:= First_Entity
(Act_P
);
14696 and then Id
/= First_Private_Entity
(Act_P
)
14698 exit when Ekind
(Id
) = E_Package
14699 and then Renamed_Object
(Id
) = Act_P
;
14701 Set_Is_Hidden
(Id
, True);
14702 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
14704 if Ekind
(Id
) = E_Package
then
14705 Restore_Nested_Formal
(Id
);
14716 end Restore_Private_Views
;
14723 (Gen_Unit
: Entity_Id
;
14724 Act_Unit
: Entity_Id
)
14728 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
14731 ----------------------------
14732 -- Save_Global_References --
14733 ----------------------------
14735 procedure Save_Global_References
(Templ
: Node_Id
) is
14737 -- ??? it is horrible to use global variables in highly recursive code
14740 -- The entity of the current associated node
14742 Gen_Scope
: Entity_Id
;
14743 -- The scope of the generic for which references are being saved
14746 -- The current associated node
14748 function Is_Global
(E
: Entity_Id
) return Boolean;
14749 -- Check whether entity is defined outside of generic unit. Examine the
14750 -- scope of an entity, and the scope of the scope, etc, until we find
14751 -- either Standard, in which case the entity is global, or the generic
14752 -- unit itself, which indicates that the entity is local. If the entity
14753 -- is the generic unit itself, as in the case of a recursive call, or
14754 -- the enclosing generic unit, if different from the current scope, then
14755 -- it is local as well, because it will be replaced at the point of
14756 -- instantiation. On the other hand, if it is a reference to a child
14757 -- unit of a common ancestor, which appears in an instantiation, it is
14758 -- global because it is used to denote a specific compilation unit at
14759 -- the time the instantiations will be analyzed.
14761 procedure Qualify_Universal_Operands
14763 Func_Call
: Node_Id
);
14764 -- Op denotes a binary or unary operator in generic template Templ. Node
14765 -- Func_Call is the function call alternative of the operator within the
14766 -- the analyzed copy of the template. Change each operand which yields a
14767 -- universal type by wrapping it into a qualified expression
14769 -- Actual_Typ'(Operand)
14771 -- where Actual_Typ is the type of corresponding actual parameter of
14772 -- Operand in Func_Call.
14774 procedure Reset_Entity
(N
: Node_Id
);
14775 -- Save semantic information on global entity so that it is not resolved
14776 -- again at instantiation time.
14778 procedure Save_Entity_Descendants
(N
: Node_Id
);
14779 -- Apply Save_Global_References to the two syntactic descendants of
14780 -- non-terminal nodes that carry an Associated_Node and are processed
14781 -- through Reset_Entity. Once the global entity (if any) has been
14782 -- captured together with its type, only two syntactic descendants need
14783 -- to be traversed to complete the processing of the tree rooted at N.
14784 -- This applies to Selected_Components, Expanded_Names, and to Operator
14785 -- nodes. N can also be a character literal, identifier, or operator
14786 -- symbol node, but the call has no effect in these cases.
14788 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
);
14789 -- Default actuals in nested instances must be handled specially
14790 -- because there is no link to them from the original tree. When an
14791 -- actual subprogram is given by a default, we add an explicit generic
14792 -- association for it in the instantiation node. When we save the
14793 -- global references on the name of the instance, we recover the list
14794 -- of generic associations, and add an explicit one to the original
14795 -- generic tree, through which a global actual can be preserved.
14796 -- Similarly, if a child unit is instantiated within a sibling, in the
14797 -- context of the parent, we must preserve the identifier of the parent
14798 -- so that it can be properly resolved in a subsequent instantiation.
14800 procedure Save_Global_Descendant
(D
: Union_Id
);
14801 -- Apply Save_References recursively to the descendants of node D
14803 procedure Save_References
(N
: Node_Id
);
14804 -- This is the recursive procedure that does the work, once the
14805 -- enclosing generic scope has been established.
14811 function Is_Global
(E
: Entity_Id
) return Boolean is
14814 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
14815 -- Determine whether the parent node of a reference to a child unit
14816 -- denotes an instantiation or a formal package, in which case the
14817 -- reference to the child unit is global, even if it appears within
14818 -- the current scope (e.g. when the instance appears within the body
14819 -- of an ancestor).
14821 ----------------------
14822 -- Is_Instance_Node --
14823 ----------------------
14825 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
14827 return Nkind
(Decl
) in N_Generic_Instantiation
14829 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
14830 end Is_Instance_Node
;
14832 -- Start of processing for Is_Global
14835 if E
= Gen_Scope
then
14838 elsif E
= Standard_Standard
then
14841 elsif Is_Child_Unit
(E
)
14842 and then (Is_Instance_Node
(Parent
(N2
))
14843 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
14844 and then N2
= Selector_Name
(Parent
(N2
))
14846 Is_Instance_Node
(Parent
(Parent
(N2
)))))
14852 while Se
/= Gen_Scope
loop
14853 if Se
= Standard_Standard
then
14864 --------------------------------
14865 -- Qualify_Universal_Operands --
14866 --------------------------------
14868 procedure Qualify_Universal_Operands
14870 Func_Call
: Node_Id
)
14872 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
);
14873 -- Rewrite operand Opnd as a qualified expression of the form
14875 -- Actual_Typ'(Opnd)
14877 -- where Actual is the corresponding actual parameter of Opnd in
14878 -- function call Func_Call.
14880 function Qualify_Type
14882 Typ
: Entity_Id
) return Node_Id
;
14883 -- Qualify type Typ by creating a selected component of the form
14885 -- Scope_Of_Typ.Typ
14887 ---------------------
14888 -- Qualify_Operand --
14889 ---------------------
14891 procedure Qualify_Operand
(Opnd
: Node_Id
; Actual
: Node_Id
) is
14892 Loc
: constant Source_Ptr
:= Sloc
(Opnd
);
14893 Typ
: constant Entity_Id
:= Etype
(Actual
);
14898 -- Qualify the operand when it is of a universal type. Note that
14899 -- the template is unanalyzed and it is not possible to directly
14900 -- query the type. This transformation is not done when the type
14901 -- of the actual is internally generated because the type will be
14902 -- regenerated in the instance.
14904 if Yields_Universal_Type
(Opnd
)
14905 and then Comes_From_Source
(Typ
)
14906 and then not Is_Hidden
(Typ
)
14908 -- The type of the actual may be a global reference. Save this
14909 -- information by creating a reference to it.
14911 if Is_Global
(Typ
) then
14912 Mark
:= New_Occurrence_Of
(Typ
, Loc
);
14914 -- Otherwise rely on resolution to find the proper type within
14918 Mark
:= Qualify_Type
(Loc
, Typ
);
14922 Make_Qualified_Expression
(Loc
,
14923 Subtype_Mark
=> Mark
,
14924 Expression
=> Relocate_Node
(Opnd
));
14926 -- Mark the qualification to distinguish it from other source
14927 -- constructs and signal the instantiation mechanism that this
14928 -- node requires special processing. See Copy_Generic_Node for
14931 Set_Is_Qualified_Universal_Literal
(Qual
);
14933 Rewrite
(Opnd
, Qual
);
14935 end Qualify_Operand
;
14941 function Qualify_Type
14943 Typ
: Entity_Id
) return Node_Id
14945 Scop
: constant Entity_Id
:= Scope
(Typ
);
14949 Result
:= Make_Identifier
(Loc
, Chars
(Typ
));
14951 if Present
(Scop
) and then not Is_Generic_Unit
(Scop
) then
14953 Make_Selected_Component
(Loc
,
14954 Prefix
=> Make_Identifier
(Loc
, Chars
(Scop
)),
14955 Selector_Name
=> Result
);
14963 Actuals
: constant List_Id
:= Parameter_Associations
(Func_Call
);
14965 -- Start of processing for Qualify_Universal_Operands
14968 if Nkind
(Op
) in N_Binary_Op
then
14969 Qualify_Operand
(Left_Opnd
(Op
), First
(Actuals
));
14970 Qualify_Operand
(Right_Opnd
(Op
), Next
(First
(Actuals
)));
14972 elsif Nkind
(Op
) in N_Unary_Op
then
14973 Qualify_Operand
(Right_Opnd
(Op
), First
(Actuals
));
14975 end Qualify_Universal_Operands
;
14981 procedure Reset_Entity
(N
: Node_Id
) is
14982 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
14983 -- If the type of N2 is global to the generic unit, save the type in
14984 -- the generic node. Just as we perform name capture for explicit
14985 -- references within the generic, we must capture the global types
14986 -- of local entities because they may participate in resolution in
14989 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
14990 -- Find the ultimate ancestor of the current unit. If it is not a
14991 -- generic unit, then the name of the current unit in the prefix of
14992 -- an expanded name must be replaced with its generic homonym to
14993 -- ensure that it will be properly resolved in an instance.
14995 ---------------------
14996 -- Set_Global_Type --
14997 ---------------------
14999 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
15000 Typ
: constant Entity_Id
:= Etype
(N2
);
15003 Set_Etype
(N
, Typ
);
15005 -- If the entity of N is not the associated node, this is a
15006 -- nested generic and it has an associated node as well, whose
15007 -- type is already the full view (see below). Indicate that the
15008 -- original node has a private view.
15010 if Entity
(N
) /= N2
and then Has_Private_View
(Entity
(N
)) then
15011 Set_Has_Private_View
(N
);
15014 -- If not a private type, nothing else to do
15016 if not Is_Private_Type
(Typ
) then
15017 if Is_Array_Type
(Typ
)
15018 and then Is_Private_Type
(Component_Type
(Typ
))
15020 Set_Has_Private_View
(N
);
15023 -- If it is a derivation of a private type in a context where no
15024 -- full view is needed, nothing to do either.
15026 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
15029 -- Otherwise mark the type for flipping and use the full view when
15033 Set_Has_Private_View
(N
);
15035 if Present
(Full_View
(Typ
)) then
15036 Set_Etype
(N2
, Full_View
(Typ
));
15040 if Is_Floating_Point_Type
(Typ
)
15041 and then Has_Dimension_System
(Typ
)
15043 Copy_Dimensions
(N2
, N
);
15045 end Set_Global_Type
;
15051 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
15056 while Is_Child_Unit
(Par
) loop
15057 Par
:= Scope
(Par
);
15063 -- Start of processing for Reset_Entity
15066 N2
:= Get_Associated_Node
(N
);
15069 if Present
(E
) then
15071 -- If the node is an entry call to an entry in an enclosing task,
15072 -- it is rewritten as a selected component. No global entity to
15073 -- preserve in this case, since the expansion will be redone in
15076 if not Nkind_In
(E
, N_Defining_Character_Literal
,
15077 N_Defining_Identifier
,
15078 N_Defining_Operator_Symbol
)
15080 Set_Associated_Node
(N
, Empty
);
15081 Set_Etype
(N
, Empty
);
15085 -- If the entity is an itype created as a subtype of an access
15086 -- type with a null exclusion restore source entity for proper
15087 -- visibility. The itype will be created anew in the instance.
15090 and then Ekind
(E
) = E_Access_Subtype
15091 and then Is_Entity_Name
(N
)
15092 and then Chars
(Etype
(E
)) = Chars
(N
)
15095 Set_Entity
(N2
, E
);
15099 if Is_Global
(E
) then
15101 -- If the entity is a package renaming that is the prefix of
15102 -- an expanded name, it has been rewritten as the renamed
15103 -- package, which is necessary semantically but complicates
15104 -- ASIS tree traversal, so we recover the original entity to
15105 -- expose the renaming. Take into account that the context may
15106 -- be a nested generic, that the original node may itself have
15107 -- an associated node that had better be an entity, and that
15108 -- the current node is still a selected component.
15110 if Ekind
(E
) = E_Package
15111 and then Nkind
(N
) = N_Selected_Component
15112 and then Nkind
(Parent
(N
)) = N_Expanded_Name
15113 and then Present
(Original_Node
(N2
))
15114 and then Is_Entity_Name
(Original_Node
(N2
))
15115 and then Present
(Entity
(Original_Node
(N2
)))
15117 if Is_Global
(Entity
(Original_Node
(N2
))) then
15118 N2
:= Original_Node
(N2
);
15119 Set_Associated_Node
(N
, N2
);
15120 Set_Global_Type
(N
, N2
);
15122 -- Renaming is local, and will be resolved in instance
15125 Set_Associated_Node
(N
, Empty
);
15126 Set_Etype
(N
, Empty
);
15130 Set_Global_Type
(N
, N2
);
15133 elsif Nkind
(N
) = N_Op_Concat
15134 and then Is_Generic_Type
(Etype
(N2
))
15135 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
15137 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
15138 and then Is_Intrinsic_Subprogram
(E
)
15142 -- Entity is local. Mark generic node as unresolved. Note that now
15143 -- it does not have an entity.
15146 Set_Associated_Node
(N
, Empty
);
15147 Set_Etype
(N
, Empty
);
15150 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
15151 and then N
= Name
(Parent
(N
))
15153 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
15156 elsif Nkind
(Parent
(N
)) = N_Selected_Component
15157 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
15159 if Is_Global
(Entity
(Parent
(N2
))) then
15160 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
15161 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
15162 Set_Global_Type
(Parent
(N
), Parent
(N2
));
15163 Save_Entity_Descendants
(N
);
15165 -- If this is a reference to the current generic entity, replace
15166 -- by the name of the generic homonym of the current package. This
15167 -- is because in an instantiation Par.P.Q will not resolve to the
15168 -- name of the instance, whose enclosing scope is not necessarily
15169 -- Par. We use the generic homonym rather that the name of the
15170 -- generic itself because it may be hidden by a local declaration.
15172 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
15174 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
15176 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
15177 Rewrite
(Parent
(N
),
15178 Make_Identifier
(Sloc
(N
),
15180 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
15182 Rewrite
(Parent
(N
),
15183 Make_Identifier
(Sloc
(N
),
15184 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
15188 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
15189 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
15191 Save_Global_Defaults
15192 (Parent
(Parent
(N
)), Parent
(Parent
(N2
)));
15195 -- A selected component may denote a static constant that has been
15196 -- folded. If the static constant is global to the generic, capture
15197 -- its value. Otherwise the folding will happen in any instantiation.
15199 elsif Nkind
(Parent
(N
)) = N_Selected_Component
15200 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
15202 if Present
(Entity
(Original_Node
(Parent
(N2
))))
15203 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
15205 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
15206 Set_Analyzed
(Parent
(N
), False);
15209 -- A selected component may be transformed into a parameterless
15210 -- function call. If the called entity is global, rewrite the node
15211 -- appropriately, i.e. as an extended name for the global entity.
15213 elsif Nkind
(Parent
(N
)) = N_Selected_Component
15214 and then Nkind
(Parent
(N2
)) = N_Function_Call
15215 and then N
= Selector_Name
(Parent
(N
))
15217 if No
(Parameter_Associations
(Parent
(N2
))) then
15218 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
15219 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
15220 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
15221 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
15222 Save_Entity_Descendants
(N
);
15225 Set_Is_Prefixed_Call
(Parent
(N
));
15226 Set_Associated_Node
(N
, Empty
);
15227 Set_Etype
(N
, Empty
);
15230 -- In Ada 2005, X.F may be a call to a primitive operation,
15231 -- rewritten as F (X). This rewriting will be done again in an
15232 -- instance, so keep the original node. Global entities will be
15233 -- captured as for other constructs. Indicate that this must
15234 -- resolve as a call, to prevent accidental overloading in the
15235 -- instance, if both a component and a primitive operation appear
15239 Set_Is_Prefixed_Call
(Parent
(N
));
15242 -- Entity is local. Reset in generic unit, so that node is resolved
15243 -- anew at the point of instantiation.
15246 Set_Associated_Node
(N
, Empty
);
15247 Set_Etype
(N
, Empty
);
15251 -----------------------------
15252 -- Save_Entity_Descendants --
15253 -----------------------------
15255 procedure Save_Entity_Descendants
(N
: Node_Id
) is
15258 when N_Binary_Op
=>
15259 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
15260 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
15263 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
15265 when N_Expanded_Name
15266 | N_Selected_Component
15268 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
15269 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
15271 when N_Character_Literal
15273 | N_Operator_Symbol
15278 raise Program_Error
;
15280 end Save_Entity_Descendants
;
15282 --------------------------
15283 -- Save_Global_Defaults --
15284 --------------------------
15286 procedure Save_Global_Defaults
(N1
: Node_Id
; N2
: Node_Id
) is
15287 Loc
: constant Source_Ptr
:= Sloc
(N1
);
15288 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
15289 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
15296 Actual
: Entity_Id
;
15299 Assoc1
:= Generic_Associations
(N1
);
15301 if Present
(Assoc1
) then
15302 Act1
:= First
(Assoc1
);
15305 Set_Generic_Associations
(N1
, New_List
);
15306 Assoc1
:= Generic_Associations
(N1
);
15309 if Present
(Assoc2
) then
15310 Act2
:= First
(Assoc2
);
15315 while Present
(Act1
) and then Present
(Act2
) loop
15320 -- Find the associations added for default subprograms
15322 if Present
(Act2
) then
15323 while Nkind
(Act2
) /= N_Generic_Association
15324 or else No
(Entity
(Selector_Name
(Act2
)))
15325 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
15330 -- Add a similar association if the default is global. The
15331 -- renaming declaration for the actual has been analyzed, and
15332 -- its alias is the program it renames. Link the actual in the
15333 -- original generic tree with the node in the analyzed tree.
15335 while Present
(Act2
) loop
15336 Subp
:= Entity
(Selector_Name
(Act2
));
15337 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
15339 -- Following test is defence against rubbish errors
15341 if No
(Alias
(Subp
)) then
15345 -- Retrieve the resolved actual from the renaming declaration
15346 -- created for the instantiated formal.
15348 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
15349 Set_Entity
(Def
, Actual
);
15350 Set_Etype
(Def
, Etype
(Actual
));
15352 if Is_Global
(Actual
) then
15354 Make_Generic_Association
(Loc
,
15356 New_Occurrence_Of
(Subp
, Loc
),
15357 Explicit_Generic_Actual_Parameter
=>
15358 New_Occurrence_Of
(Actual
, Loc
));
15360 Set_Associated_Node
15361 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
15363 Append
(Ndec
, Assoc1
);
15365 -- If there are other defaults, add a dummy association in case
15366 -- there are other defaulted formals with the same name.
15368 elsif Present
(Next
(Act2
)) then
15370 Make_Generic_Association
(Loc
,
15372 New_Occurrence_Of
(Subp
, Loc
),
15373 Explicit_Generic_Actual_Parameter
=> Empty
);
15375 Append
(Ndec
, Assoc1
);
15382 if Nkind
(Name
(N1
)) = N_Identifier
15383 and then Is_Child_Unit
(Gen_Id
)
15384 and then Is_Global
(Gen_Id
)
15385 and then Is_Generic_Unit
(Scope
(Gen_Id
))
15386 and then In_Open_Scopes
(Scope
(Gen_Id
))
15388 -- This is an instantiation of a child unit within a sibling, so
15389 -- that the generic parent is in scope. An eventual instance must
15390 -- occur within the scope of an instance of the parent. Make name
15391 -- in instance into an expanded name, to preserve the identifier
15392 -- of the parent, so it can be resolved subsequently.
15394 Rewrite
(Name
(N2
),
15395 Make_Expanded_Name
(Loc
,
15396 Chars
=> Chars
(Gen_Id
),
15397 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
15398 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
15399 Set_Entity
(Name
(N2
), Gen_Id
);
15401 Rewrite
(Name
(N1
),
15402 Make_Expanded_Name
(Loc
,
15403 Chars
=> Chars
(Gen_Id
),
15404 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
15405 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
15407 Set_Associated_Node
(Name
(N1
), Name
(N2
));
15408 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
15409 Set_Associated_Node
15410 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
15411 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
15413 end Save_Global_Defaults
;
15415 ----------------------------
15416 -- Save_Global_Descendant --
15417 ----------------------------
15419 procedure Save_Global_Descendant
(D
: Union_Id
) is
15423 if D
in Node_Range
then
15424 if D
= Union_Id
(Empty
) then
15427 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
15428 Save_References
(Node_Id
(D
));
15431 elsif D
in List_Range
then
15432 pragma Assert
(D
/= Union_Id
(No_List
));
15433 -- Because No_List = Empty, which is in Node_Range above
15435 if Is_Empty_List
(List_Id
(D
)) then
15439 N1
:= First
(List_Id
(D
));
15440 while Present
(N1
) loop
15441 Save_References
(N1
);
15446 -- Element list or other non-node field, nothing to do
15451 end Save_Global_Descendant
;
15453 ---------------------
15454 -- Save_References --
15455 ---------------------
15457 -- This is the recursive procedure that does the work once the enclosing
15458 -- generic scope has been established. We have to treat specially a
15459 -- number of node rewritings that are required by semantic processing
15460 -- and which change the kind of nodes in the generic copy: typically
15461 -- constant-folding, replacing an operator node by a string literal, or
15462 -- a selected component by an expanded name. In each of those cases, the
15463 -- transformation is propagated to the generic unit.
15465 procedure Save_References
(N
: Node_Id
) is
15466 Loc
: constant Source_Ptr
:= Sloc
(N
);
15468 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean;
15469 -- Determine whether arbitrary node Nod requires delayed capture of
15470 -- global references within its aspect specifications.
15472 procedure Save_References_In_Aggregate
(N
: Node_Id
);
15473 -- Save all global references in [extension] aggregate node N
15475 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
);
15476 -- Save all global references in a character literal or operator
15477 -- symbol denoted by N.
15479 procedure Save_References_In_Descendants
(N
: Node_Id
);
15480 -- Save all global references in all descendants of node N
15482 procedure Save_References_In_Identifier
(N
: Node_Id
);
15483 -- Save all global references in identifier node N
15485 procedure Save_References_In_Operator
(N
: Node_Id
);
15486 -- Save all global references in operator node N
15488 procedure Save_References_In_Pragma
(Prag
: Node_Id
);
15489 -- Save all global references found within the expression of pragma
15492 ---------------------------
15493 -- Requires_Delayed_Save --
15494 ---------------------------
15496 function Requires_Delayed_Save
(Nod
: Node_Id
) return Boolean is
15498 -- Generic packages and subprograms require delayed capture of
15499 -- global references within their aspects due to the timing of
15500 -- annotation analysis.
15502 if Nkind_In
(Nod
, N_Generic_Package_Declaration
,
15503 N_Generic_Subprogram_Declaration
,
15505 N_Package_Body_Stub
,
15507 N_Subprogram_Body_Stub
)
15509 -- Since the capture of global references is done on the
15510 -- unanalyzed generic template, there is no information around
15511 -- to infer the context. Use the Associated_Entity linkages to
15512 -- peek into the analyzed generic copy and determine what the
15513 -- template corresponds to.
15515 if Nod
= Templ
then
15517 Is_Generic_Declaration_Or_Body
15518 (Unit_Declaration_Node
15519 (Associated_Entity
(Defining_Entity
(Nod
))));
15521 -- Otherwise the generic unit being processed is not the top
15522 -- level template. It is safe to capture of global references
15523 -- within the generic unit because at this point the top level
15524 -- copy is fully analyzed.
15530 -- Otherwise capture the global references without interference
15535 end Requires_Delayed_Save
;
15537 ----------------------------------
15538 -- Save_References_In_Aggregate --
15539 ----------------------------------
15541 procedure Save_References_In_Aggregate
(N
: Node_Id
) is
15543 Qual
: Node_Id
:= Empty
;
15544 Typ
: Entity_Id
:= Empty
;
15546 use Atree
.Unchecked_Access
;
15547 -- This code section is part of implementing an untyped tree
15548 -- traversal, so it needs direct access to node fields.
15551 N2
:= Get_Associated_Node
(N
);
15553 if Present
(N2
) then
15556 -- In an instance within a generic, use the name of the actual
15557 -- and not the original generic parameter. If the actual is
15558 -- global in the current generic it must be preserved for its
15561 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
15562 and then Present
(Generic_Parent_Type
(Parent
(Typ
)))
15564 Typ
:= Base_Type
(Typ
);
15565 Set_Etype
(N2
, Typ
);
15569 if No
(N2
) or else No
(Typ
) or else not Is_Global
(Typ
) then
15570 Set_Associated_Node
(N
, Empty
);
15572 -- If the aggregate is an actual in a call, it has been
15573 -- resolved in the current context, to some local type. The
15574 -- enclosing call may have been disambiguated by the aggregate,
15575 -- and this disambiguation might fail at instantiation time
15576 -- because the type to which the aggregate did resolve is not
15577 -- preserved. In order to preserve some of this information,
15578 -- wrap the aggregate in a qualified expression, using the id
15579 -- of its type. For further disambiguation we qualify the type
15580 -- name with its scope (if visible and not hidden by a local
15581 -- homograph) because both id's will have corresponding
15582 -- entities in an instance. This resolves most of the problems
15583 -- with missing type information on aggregates in instances.
15586 and then Nkind
(N2
) = Nkind
(N
)
15587 and then Nkind
(Parent
(N2
)) in N_Subprogram_Call
15588 and then Present
(Typ
)
15589 and then Comes_From_Source
(Typ
)
15591 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
15593 if Is_Immediately_Visible
(Scope
(Typ
))
15595 (not In_Open_Scopes
(Scope
(Typ
))
15596 or else Current_Entity
(Scope
(Typ
)) = Scope
(Typ
))
15599 Make_Selected_Component
(Loc
,
15601 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
15602 Selector_Name
=> Nam
);
15606 Make_Qualified_Expression
(Loc
,
15607 Subtype_Mark
=> Nam
,
15608 Expression
=> Relocate_Node
(N
));
15612 Save_Global_Descendant
(Field1
(N
));
15613 Save_Global_Descendant
(Field2
(N
));
15614 Save_Global_Descendant
(Field3
(N
));
15615 Save_Global_Descendant
(Field5
(N
));
15617 if Present
(Qual
) then
15620 end Save_References_In_Aggregate
;
15622 ----------------------------------------------
15623 -- Save_References_In_Char_Lit_Or_Op_Symbol --
15624 ----------------------------------------------
15626 procedure Save_References_In_Char_Lit_Or_Op_Symbol
(N
: Node_Id
) is
15628 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15631 elsif Nkind
(N
) = N_Operator_Symbol
15632 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
15634 Change_Operator_Symbol_To_String_Literal
(N
);
15636 end Save_References_In_Char_Lit_Or_Op_Symbol
;
15638 ------------------------------------
15639 -- Save_References_In_Descendants --
15640 ------------------------------------
15642 procedure Save_References_In_Descendants
(N
: Node_Id
) is
15643 use Atree
.Unchecked_Access
;
15644 -- This code section is part of implementing an untyped tree
15645 -- traversal, so it needs direct access to node fields.
15648 Save_Global_Descendant
(Field1
(N
));
15649 Save_Global_Descendant
(Field2
(N
));
15650 Save_Global_Descendant
(Field3
(N
));
15651 Save_Global_Descendant
(Field4
(N
));
15652 Save_Global_Descendant
(Field5
(N
));
15653 end Save_References_In_Descendants
;
15655 -----------------------------------
15656 -- Save_References_In_Identifier --
15657 -----------------------------------
15659 procedure Save_References_In_Identifier
(N
: Node_Id
) is
15661 -- The node did not undergo a transformation
15663 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15665 Aux_N2
: constant Node_Id
:= Get_Associated_Node
(N
);
15666 Orig_N2_Parent
: constant Node_Id
:=
15667 Original_Node
(Parent
(Aux_N2
));
15669 -- The parent of this identifier is a selected component
15670 -- which denotes a named number that was constant folded.
15671 -- Preserve the original name for ASIS and link the parent
15672 -- with its expanded name. The constant folding will be
15673 -- repeated in the instance.
15675 if Nkind
(Parent
(N
)) = N_Selected_Component
15676 and then Nkind_In
(Parent
(Aux_N2
), N_Integer_Literal
,
15678 and then Is_Entity_Name
(Orig_N2_Parent
)
15679 and then Ekind
(Entity
(Orig_N2_Parent
)) in Named_Kind
15680 and then Is_Global
(Entity
(Orig_N2_Parent
))
15683 Set_Associated_Node
15684 (Parent
(N
), Original_Node
(Parent
(N2
)));
15689 -- If this is a discriminant reference, always save it.
15690 -- It is used in the instance to find the corresponding
15691 -- discriminant positionally rather than by name.
15693 Set_Original_Discriminant
15694 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
15700 -- The analysis of the generic copy transformed the identifier
15701 -- into another construct. Propagate the changes to the template.
15704 N2
:= Get_Associated_Node
(N
);
15706 -- The identifier denotes a call to a parameterless function.
15707 -- Mark the node as resolved when the function is external.
15709 if Nkind
(N2
) = N_Function_Call
then
15710 E
:= Entity
(Name
(N2
));
15712 if Present
(E
) and then Is_Global
(E
) then
15713 Set_Etype
(N
, Etype
(N2
));
15715 Set_Associated_Node
(N
, Empty
);
15716 Set_Etype
(N
, Empty
);
15719 -- The identifier denotes a named number that was constant
15720 -- folded. Preserve the original name for ASIS and undo the
15721 -- constant folding which will be repeated in the instance.
15723 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
15724 and then Is_Entity_Name
(Original_Node
(N2
))
15726 Set_Associated_Node
(N
, Original_Node
(N2
));
15729 -- The identifier resolved to a string literal. Propagate this
15730 -- information to the generic template.
15732 elsif Nkind
(N2
) = N_String_Literal
then
15733 Rewrite
(N
, New_Copy
(N2
));
15735 -- The identifier is rewritten as a dereference if it is the
15736 -- prefix of an implicit dereference. Preserve the original
15737 -- tree as the analysis of the instance will expand the node
15738 -- again, but preserve the resolved entity if it is global.
15740 elsif Nkind
(N2
) = N_Explicit_Dereference
then
15741 if Is_Entity_Name
(Prefix
(N2
))
15742 and then Present
(Entity
(Prefix
(N2
)))
15743 and then Is_Global
(Entity
(Prefix
(N2
)))
15745 Set_Associated_Node
(N
, Prefix
(N2
));
15747 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
15748 and then Present
(Entity
(Name
(Prefix
(N2
))))
15749 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
15752 Make_Explicit_Dereference
(Loc
,
15754 Make_Function_Call
(Loc
,
15757 (Entity
(Name
(Prefix
(N2
))), Loc
))));
15760 Set_Associated_Node
(N
, Empty
);
15761 Set_Etype
(N
, Empty
);
15764 -- The subtype mark of a nominally unconstrained object is
15765 -- rewritten as a subtype indication using the bounds of the
15766 -- expression. Recover the original subtype mark.
15768 elsif Nkind
(N2
) = N_Subtype_Indication
15769 and then Is_Entity_Name
(Original_Node
(N2
))
15771 Set_Associated_Node
(N
, Original_Node
(N2
));
15775 end Save_References_In_Identifier
;
15777 ---------------------------------
15778 -- Save_References_In_Operator --
15779 ---------------------------------
15781 procedure Save_References_In_Operator
(N
: Node_Id
) is
15783 -- The node did not undergo a transformation
15785 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
15786 if Nkind
(N
) = N_Op_Concat
then
15787 Set_Is_Component_Left_Opnd
(N
,
15788 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
15790 Set_Is_Component_Right_Opnd
(N
,
15791 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
15796 -- The analysis of the generic copy transformed the operator into
15797 -- some other construct. Propagate the changes to the template if
15801 N2
:= Get_Associated_Node
(N
);
15803 -- The operator resoved to a function call
15805 if Nkind
(N2
) = N_Function_Call
then
15807 -- Add explicit qualifications in the generic template for
15808 -- all operands of universal type. This aids resolution by
15809 -- preserving the actual type of a literal or an attribute
15810 -- that yields a universal result.
15812 Qualify_Universal_Operands
(N
, N2
);
15814 E
:= Entity
(Name
(N2
));
15816 if Present
(E
) and then Is_Global
(E
) then
15817 Set_Etype
(N
, Etype
(N2
));
15819 Set_Associated_Node
(N
, Empty
);
15820 Set_Etype
(N
, Empty
);
15823 -- The operator was folded into a literal
15825 elsif Nkind_In
(N2
, N_Integer_Literal
,
15829 if Present
(Original_Node
(N2
))
15830 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
15832 -- Operation was constant-folded. Whenever possible,
15833 -- recover semantic information from unfolded node,
15836 Set_Associated_Node
(N
, Original_Node
(N2
));
15838 if Nkind
(N
) = N_Op_Concat
then
15839 Set_Is_Component_Left_Opnd
(N
,
15840 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
15841 Set_Is_Component_Right_Opnd
(N
,
15842 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
15847 -- Propagate the constant folding back to the template
15850 Rewrite
(N
, New_Copy
(N2
));
15851 Set_Analyzed
(N
, False);
15854 -- The operator was folded into an enumeration literal. Retain
15855 -- the entity to avoid spurious ambiguities if it is overloaded
15856 -- at the point of instantiation or inlining.
15858 elsif Nkind
(N2
) = N_Identifier
15859 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
15861 Rewrite
(N
, New_Copy
(N2
));
15862 Set_Analyzed
(N
, False);
15866 -- Complete the operands check if node has not been constant
15869 if Nkind
(N
) in N_Op
then
15870 Save_Entity_Descendants
(N
);
15872 end Save_References_In_Operator
;
15874 -------------------------------
15875 -- Save_References_In_Pragma --
15876 -------------------------------
15878 procedure Save_References_In_Pragma
(Prag
: Node_Id
) is
15880 Do_Save
: Boolean := True;
15882 use Atree
.Unchecked_Access
;
15883 -- This code section is part of implementing an untyped tree
15884 -- traversal, so it needs direct access to node fields.
15887 -- Do not save global references in pragmas generated from aspects
15888 -- because the pragmas will be regenerated at instantiation time.
15890 if From_Aspect_Specification
(Prag
) then
15893 -- The capture of global references within contract-related source
15894 -- pragmas associated with generic packages, subprograms or their
15895 -- respective bodies must be delayed due to timing of annotation
15896 -- analysis. Global references are still captured in routine
15897 -- Save_Global_References_In_Contract.
15899 elsif Is_Generic_Contract_Pragma
(Prag
) and then Prag
/= Templ
then
15900 if Is_Package_Contract_Annotation
(Prag
) then
15901 Context
:= Find_Related_Package_Or_Body
(Prag
);
15903 pragma Assert
(Is_Subprogram_Contract_Annotation
(Prag
));
15904 Context
:= Find_Related_Declaration_Or_Body
(Prag
);
15907 -- The use of Original_Node accounts for the case when the
15908 -- related context is generic template.
15910 if Requires_Delayed_Save
(Original_Node
(Context
)) then
15915 -- For all other cases, save all global references within the
15916 -- descendants, but skip the following semantic fields:
15918 -- Field1 - Next_Pragma
15919 -- Field3 - Corresponding_Aspect
15920 -- Field5 - Next_Rep_Item
15923 Save_Global_Descendant
(Field2
(Prag
));
15924 Save_Global_Descendant
(Field4
(Prag
));
15926 end Save_References_In_Pragma
;
15928 -- Start of processing for Save_References
15936 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
15937 Save_References_In_Aggregate
(N
);
15939 -- Character literals, operator symbols
15941 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
15942 Save_References_In_Char_Lit_Or_Op_Symbol
(N
);
15944 -- Defining identifiers
15946 elsif Nkind
(N
) in N_Entity
then
15951 elsif Nkind
(N
) = N_Identifier
then
15952 Save_References_In_Identifier
(N
);
15956 elsif Nkind
(N
) in N_Op
then
15957 Save_References_In_Operator
(N
);
15961 elsif Nkind
(N
) = N_Pragma
then
15962 Save_References_In_Pragma
(N
);
15965 Save_References_In_Descendants
(N
);
15968 -- Save all global references found within the aspect specifications
15969 -- of the related node.
15971 if Permits_Aspect_Specifications
(N
) and then Has_Aspects
(N
) then
15973 -- The capture of global references within aspects associated with
15974 -- generic packages, subprograms or their bodies must be delayed
15975 -- due to timing of annotation analysis. Global references are
15976 -- still captured in routine Save_Global_References_In_Contract.
15978 if Requires_Delayed_Save
(N
) then
15981 -- Otherwise save all global references within the aspects
15984 Save_Global_References_In_Aspects
(N
);
15987 end Save_References
;
15989 -- Start of processing for Save_Global_References
15992 Gen_Scope
:= Current_Scope
;
15994 -- If the generic unit is a child unit, references to entities in the
15995 -- parent are treated as local, because they will be resolved anew in
15996 -- the context of the instance of the parent.
15998 while Is_Child_Unit
(Gen_Scope
)
15999 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
16001 Gen_Scope
:= Scope
(Gen_Scope
);
16004 Save_References
(Templ
);
16005 end Save_Global_References
;
16007 ---------------------------------------
16008 -- Save_Global_References_In_Aspects --
16009 ---------------------------------------
16011 procedure Save_Global_References_In_Aspects
(N
: Node_Id
) is
16016 Asp
:= First
(Aspect_Specifications
(N
));
16017 while Present
(Asp
) loop
16018 Expr
:= Expression
(Asp
);
16020 if Present
(Expr
) then
16021 Save_Global_References
(Expr
);
16026 end Save_Global_References_In_Aspects
;
16028 ------------------------------------------
16029 -- Set_Copied_Sloc_For_Inherited_Pragma --
16030 ------------------------------------------
16032 procedure Set_Copied_Sloc_For_Inherited_Pragma
16037 Create_Instantiation_Source
(N
, E
,
16038 Inlined_Body
=> False,
16039 Inherited_Pragma
=> True,
16040 Factor
=> S_Adjustment
);
16041 end Set_Copied_Sloc_For_Inherited_Pragma
;
16043 --------------------------------------
16044 -- Set_Copied_Sloc_For_Inlined_Body --
16045 --------------------------------------
16047 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
16049 Create_Instantiation_Source
(N
, E
,
16050 Inlined_Body
=> True,
16051 Inherited_Pragma
=> False,
16052 Factor
=> S_Adjustment
);
16053 end Set_Copied_Sloc_For_Inlined_Body
;
16055 ---------------------
16056 -- Set_Instance_Of --
16057 ---------------------
16059 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
16061 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
16062 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
16063 Generic_Renamings
.Increment_Last
;
16064 end Set_Instance_Of
;
16066 --------------------
16067 -- Set_Next_Assoc --
16068 --------------------
16070 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
16072 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
16073 end Set_Next_Assoc
;
16075 -------------------
16076 -- Start_Generic --
16077 -------------------
16079 procedure Start_Generic
is
16081 -- ??? More things could be factored out in this routine.
16082 -- Should probably be done at a later stage.
16084 Generic_Flags
.Append
(Inside_A_Generic
);
16085 Inside_A_Generic
:= True;
16087 Expander_Mode_Save_And_Set
(False);
16090 ----------------------
16091 -- Set_Instance_Env --
16092 ----------------------
16094 -- WARNING: This routine manages SPARK regions
16096 procedure Set_Instance_Env
16097 (Gen_Unit
: Entity_Id
;
16098 Act_Unit
: Entity_Id
)
16100 Saved_AE
: constant Boolean := Assertions_Enabled
;
16101 Saved_CPL
: constant Node_Id
:= Check_Policy_List
;
16102 Saved_DEC
: constant Boolean := Dynamic_Elaboration_Checks
;
16103 Saved_SM
: constant SPARK_Mode_Type
:= SPARK_Mode
;
16104 Saved_SMP
: constant Node_Id
:= SPARK_Mode_Pragma
;
16107 -- Regardless of the current mode, predefined units are analyzed in the
16108 -- most current Ada mode, and earlier version Ada checks do not apply
16109 -- to predefined units. Nothing needs to be done for non-internal units.
16110 -- These are always analyzed in the current mode.
16112 if In_Internal_Unit
(Gen_Unit
) then
16114 -- The following call resets all configuration attributes to default
16115 -- or the xxx_Config versions of the attributes when the current sem
16116 -- unit is the main unit. At the same time, internal units must also
16117 -- inherit certain configuration attributes from their context. It
16118 -- is unclear what these two sets are.
16120 Set_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
16122 -- Reinstall relevant configuration attributes of the context
16124 Assertions_Enabled
:= Saved_AE
;
16125 Check_Policy_List
:= Saved_CPL
;
16126 Dynamic_Elaboration_Checks
:= Saved_DEC
;
16128 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
16131 Current_Instantiated_Parent
:=
16132 (Gen_Id
=> Gen_Unit
,
16133 Act_Id
=> Act_Unit
,
16134 Next_In_HTable
=> Assoc_Null
);
16135 end Set_Instance_Env
;
16141 procedure Switch_View
(T
: Entity_Id
) is
16142 BT
: constant Entity_Id
:= Base_Type
(T
);
16143 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
16144 Priv_Sub
: Entity_Id
;
16147 -- T may be private but its base type may have been exchanged through
16148 -- some other occurrence, in which case there is nothing to switch
16149 -- besides T itself. Note that a private dependent subtype of a private
16150 -- type might not have been switched even if the base type has been,
16151 -- because of the last branch of Check_Private_View (see comment there).
16153 if not Is_Private_Type
(BT
) then
16154 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
16155 Exchange_Declarations
(T
);
16159 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
16161 if Present
(Full_View
(BT
)) then
16162 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
16163 Exchange_Declarations
(BT
);
16166 while Present
(Priv_Elmt
) loop
16167 Priv_Sub
:= (Node
(Priv_Elmt
));
16169 -- We avoid flipping the subtype if the Etype of its full view is
16170 -- private because this would result in a malformed subtype. This
16171 -- occurs when the Etype of the subtype full view is the full view of
16172 -- the base type (and since the base types were just switched, the
16173 -- subtype is pointing to the wrong view). This is currently the case
16174 -- for tagged record types, access types (maybe more?) and needs to
16175 -- be resolved. ???
16177 if Present
(Full_View
(Priv_Sub
))
16178 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
16180 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
16181 Exchange_Declarations
(Priv_Sub
);
16184 Next_Elmt
(Priv_Elmt
);
16192 function True_Parent
(N
: Node_Id
) return Node_Id
is
16194 if Nkind
(Parent
(N
)) = N_Subunit
then
16195 return Parent
(Corresponding_Stub
(Parent
(N
)));
16201 -----------------------------
16202 -- Valid_Default_Attribute --
16203 -----------------------------
16205 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
16206 Attr_Id
: constant Attribute_Id
:=
16207 Get_Attribute_Id
(Attribute_Name
(Def
));
16208 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
16209 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
16215 if No
(T
) or else T
= Any_Id
then
16220 F
:= First_Formal
(Nam
);
16221 while Present
(F
) loop
16222 Num_F
:= Num_F
+ 1;
16227 when Attribute_Adjacent
16228 | Attribute_Ceiling
16229 | Attribute_Copy_Sign
16231 | Attribute_Fraction
16232 | Attribute_Machine
16234 | Attribute_Remainder
16235 | Attribute_Rounding
16236 | Attribute_Unbiased_Rounding
16240 and then Is_Floating_Point_Type
(T
);
16242 when Attribute_Image
16246 | Attribute_Wide_Image
16247 | Attribute_Wide_Value
16249 OK
:= Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
);
16254 OK
:= Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
);
16256 when Attribute_Input
=>
16257 OK
:= (Is_Fun
and then Num_F
= 1);
16259 when Attribute_Output
16263 OK
:= not Is_Fun
and then Num_F
= 2;
16271 ("attribute reference has wrong profile for subprogram", Def
);
16273 end Valid_Default_Attribute
;