1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Expander
; use Expander
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
36 with Itypes
; use Itypes
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Nlists
; use Nlists
;
41 with Namet
; use Namet
;
42 with Nmake
; use Nmake
;
44 with Rident
; use Rident
;
45 with Restrict
; use Restrict
;
46 with Rtsfind
; use Rtsfind
;
48 with Sem_Aux
; use Sem_Aux
;
49 with Sem_Cat
; use Sem_Cat
;
50 with Sem_Ch3
; use Sem_Ch3
;
51 with Sem_Ch6
; use Sem_Ch6
;
52 with Sem_Ch7
; use Sem_Ch7
;
53 with Sem_Ch8
; use Sem_Ch8
;
54 with Sem_Ch10
; use Sem_Ch10
;
55 with Sem_Ch13
; use Sem_Ch13
;
56 with Sem_Disp
; use Sem_Disp
;
57 with Sem_Elab
; use Sem_Elab
;
58 with Sem_Elim
; use Sem_Elim
;
59 with Sem_Eval
; use Sem_Eval
;
60 with Sem_Res
; use Sem_Res
;
61 with Sem_Type
; use Sem_Type
;
62 with Sem_Util
; use Sem_Util
;
63 with Sem_Warn
; use Sem_Warn
;
64 with Stand
; use Stand
;
65 with Sinfo
; use Sinfo
;
66 with Sinfo
.CN
; use Sinfo
.CN
;
67 with Sinput
; use Sinput
;
68 with Sinput
.L
; use Sinput
.L
;
69 with Snames
; use Snames
;
70 with Stringt
; use Stringt
;
71 with Uname
; use Uname
;
73 with Tbuild
; use Tbuild
;
74 with Uintp
; use Uintp
;
75 with Urealp
; use Urealp
;
79 package body Sem_Ch12
is
81 ----------------------------------------------------------
82 -- Implementation of Generic Analysis and Instantiation --
83 ----------------------------------------------------------
85 -- GNAT implements generics by macro expansion. No attempt is made to share
86 -- generic instantiations (for now). Analysis of a generic definition does
87 -- not perform any expansion action, but the expander must be called on the
88 -- tree for each instantiation, because the expansion may of course depend
89 -- on the generic actuals. All of this is best achieved as follows:
91 -- a) Semantic analysis of a generic unit is performed on a copy of the
92 -- tree for the generic unit. All tree modifications that follow analysis
93 -- do not affect the original tree. Links are kept between the original
94 -- tree and the copy, in order to recognize non-local references within
95 -- the generic, and propagate them to each instance (recall that name
96 -- resolution is done on the generic declaration: generics are not really
97 -- macros!). This is summarized in the following diagram:
99 -- .-----------. .----------.
100 -- | semantic |<--------------| generic |
102 -- | |==============>| |
103 -- |___________| global |__________|
114 -- b) Each instantiation copies the original tree, and inserts into it a
115 -- series of declarations that describe the mapping between generic formals
116 -- and actuals. For example, a generic In OUT parameter is an object
117 -- renaming of the corresponding actual, etc. Generic IN parameters are
118 -- constant declarations.
120 -- c) In order to give the right visibility for these renamings, we use
121 -- a different scheme for package and subprogram instantiations. For
122 -- packages, the list of renamings is inserted into the package
123 -- specification, before the visible declarations of the package. The
124 -- renamings are analyzed before any of the text of the instance, and are
125 -- thus visible at the right place. Furthermore, outside of the instance,
126 -- the generic parameters are visible and denote their corresponding
129 -- For subprograms, we create a container package to hold the renamings
130 -- and the subprogram instance itself. Analysis of the package makes the
131 -- renaming declarations visible to the subprogram. After analyzing the
132 -- package, the defining entity for the subprogram is touched-up so that
133 -- it appears declared in the current scope, and not inside the container
136 -- If the instantiation is a compilation unit, the container package is
137 -- given the same name as the subprogram instance. This ensures that
138 -- the elaboration procedure called by the binder, using the compilation
139 -- unit name, calls in fact the elaboration procedure for the package.
141 -- Not surprisingly, private types complicate this approach. By saving in
142 -- the original generic object the non-local references, we guarantee that
143 -- the proper entities are referenced at the point of instantiation.
144 -- However, for private types, this by itself does not insure that the
145 -- proper VIEW of the entity is used (the full type may be visible at the
146 -- point of generic definition, but not at instantiation, or vice-versa).
147 -- In order to reference the proper view, we special-case any reference
148 -- to private types in the generic object, by saving both views, one in
149 -- the generic and one in the semantic copy. At time of instantiation, we
150 -- check whether the two views are consistent, and exchange declarations if
151 -- necessary, in order to restore the correct visibility. Similarly, if
152 -- the instance view is private when the generic view was not, we perform
153 -- the exchange. After completing the instantiation, we restore the
154 -- current visibility. The flag Has_Private_View marks identifiers in the
155 -- the generic unit that require checking.
157 -- Visibility within nested generic units requires special handling.
158 -- Consider the following scheme:
160 -- type Global is ... -- outside of generic unit.
164 -- type Semi_Global is ... -- global to inner.
167 -- procedure inner (X1 : Global; X2 : Semi_Global);
169 -- procedure in2 is new inner (...); -- 4
172 -- package New_Outer is new Outer (...); -- 2
173 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
175 -- The semantic analysis of Outer captures all occurrences of Global.
176 -- The semantic analysis of Inner (at 1) captures both occurrences of
177 -- Global and Semi_Global.
179 -- At point 2 (instantiation of Outer), we also produce a generic copy
180 -- of Inner, even though Inner is, at that point, not being instantiated.
181 -- (This is just part of the semantic analysis of New_Outer).
183 -- Critically, references to Global within Inner must be preserved, while
184 -- references to Semi_Global should not preserved, because they must now
185 -- resolve to an entity within New_Outer. To distinguish between these, we
186 -- use a global variable, Current_Instantiated_Parent, which is set when
187 -- performing a generic copy during instantiation (at 2). This variable is
188 -- used when performing a generic copy that is not an instantiation, but
189 -- that is nested within one, as the occurrence of 1 within 2. The analysis
190 -- of a nested generic only preserves references that are global to the
191 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
192 -- determine whether a reference is external to the given parent.
194 -- The instantiation at point 3 requires no special treatment. The method
195 -- works as well for further nestings of generic units, but of course the
196 -- variable Current_Instantiated_Parent must be stacked because nested
197 -- instantiations can occur, e.g. the occurrence of 4 within 2.
199 -- The instantiation of package and subprogram bodies is handled in a
200 -- similar manner, except that it is delayed until after semantic
201 -- analysis is complete. In this fashion complex cross-dependencies
202 -- between several package declarations and bodies containing generics
203 -- can be compiled which otherwise would diagnose spurious circularities.
205 -- For example, it is possible to compile two packages A and B that
206 -- have the following structure:
208 -- package A is package B is
209 -- generic ... generic ...
210 -- package G_A is package G_B is
213 -- package body A is package body B is
214 -- package N_B is new G_B (..) package N_A is new G_A (..)
216 -- The table Pending_Instantiations in package Inline is used to keep
217 -- track of body instantiations that are delayed in this manner. Inline
218 -- handles the actual calls to do the body instantiations. This activity
219 -- is part of Inline, since the processing occurs at the same point, and
220 -- for essentially the same reason, as the handling of inlined routines.
222 ----------------------------------------------
223 -- Detection of Instantiation Circularities --
224 ----------------------------------------------
226 -- If we have a chain of instantiations that is circular, this is static
227 -- error which must be detected at compile time. The detection of these
228 -- circularities is carried out at the point that we insert a generic
229 -- instance spec or body. If there is a circularity, then the analysis of
230 -- the offending spec or body will eventually result in trying to load the
231 -- same unit again, and we detect this problem as we analyze the package
232 -- instantiation for the second time.
234 -- At least in some cases after we have detected the circularity, we get
235 -- into trouble if we try to keep going. The following flag is set if a
236 -- circularity is detected, and used to abandon compilation after the
237 -- messages have been posted.
239 Circularity_Detected
: Boolean := False;
240 -- This should really be reset on encountering a new main unit, but in
241 -- practice we are not using multiple main units so it is not critical.
243 -------------------------------------------------
244 -- Formal packages and partial parametrization --
245 -------------------------------------------------
247 -- When compiling a generic, a formal package is a local instantiation. If
248 -- declared with a box, its generic formals are visible in the enclosing
249 -- generic. If declared with a partial list of actuals, those actuals that
250 -- are defaulted (covered by an Others clause, or given an explicit box
251 -- initialization) are also visible in the enclosing generic, while those
252 -- that have a corresponding actual are not.
254 -- In our source model of instantiation, the same visibility must be
255 -- present in the spec and body of an instance: the names of the formals
256 -- that are defaulted must be made visible within the instance, and made
257 -- invisible (hidden) after the instantiation is complete, so that they
258 -- are not accessible outside of the instance.
260 -- In a generic, a formal package is treated like a special instantiation.
261 -- Our Ada95 compiler handled formals with and without box in different
262 -- ways. With partial parametrization, we use a single model for both.
263 -- We create a package declaration that consists of the specification of
264 -- the generic package, and a set of declarations that map the actuals
265 -- into local renamings, just as we do for bona fide instantiations. For
266 -- defaulted parameters and formals with a box, we copy directly the
267 -- declarations of the formal into this local package. The result is a
268 -- a package whose visible declarations may include generic formals. This
269 -- package is only used for type checking and visibility analysis, and
270 -- never reaches the back-end, so it can freely violate the placement
271 -- rules for generic formal declarations.
273 -- The list of declarations (renamings and copies of formals) is built
274 -- by Analyze_Associations, just as for regular instantiations.
276 -- At the point of instantiation, conformance checking must be applied only
277 -- to those parameters that were specified in the formal. We perform this
278 -- checking by creating another internal instantiation, this one including
279 -- only the renamings and the formals (the rest of the package spec is not
280 -- relevant to conformance checking). We can then traverse two lists: the
281 -- list of actuals in the instance that corresponds to the formal package,
282 -- and the list of actuals produced for this bogus instantiation. We apply
283 -- the conformance rules to those actuals that are not defaulted (i.e.
284 -- which still appear as generic formals.
286 -- When we compile an instance body we must make the right parameters
287 -- visible again. The predicate Is_Generic_Formal indicates which of the
288 -- formals should have its Is_Hidden flag reset.
290 -----------------------
291 -- Local subprograms --
292 -----------------------
294 procedure Abandon_Instantiation
(N
: Node_Id
);
295 pragma No_Return
(Abandon_Instantiation
);
296 -- Posts an error message "instantiation abandoned" at the indicated node
297 -- and then raises the exception Instantiation_Error to do it.
299 procedure Analyze_Formal_Array_Type
300 (T
: in out Entity_Id
;
302 -- A formal array type is treated like an array type declaration, and
303 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
304 -- in-out, because in the case of an anonymous type the entity is
305 -- actually created in the procedure.
307 -- The following procedures treat other kinds of formal parameters
309 procedure Analyze_Formal_Derived_Interface_Type
314 procedure Analyze_Formal_Derived_Type
319 procedure Analyze_Formal_Interface_Type
324 -- The following subprograms create abbreviated declarations for formal
325 -- scalar types. We introduce an anonymous base of the proper class for
326 -- each of them, and define the formals as constrained first subtypes of
327 -- their bases. The bounds are expressions that are non-static in the
330 procedure Analyze_Formal_Decimal_Fixed_Point_Type
331 (T
: Entity_Id
; Def
: Node_Id
);
332 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
333 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
334 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
335 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
336 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
337 (T
: Entity_Id
; Def
: Node_Id
);
339 procedure Analyze_Formal_Private_Type
343 -- Creates a new private type, which does not require completion
345 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
347 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
348 -- Create a new access type with the given designated type
350 function Analyze_Associations
353 F_Copy
: List_Id
) return List_Id
;
354 -- At instantiation time, build the list of associations between formals
355 -- and actuals. Each association becomes a renaming declaration for the
356 -- formal entity. F_Copy is the analyzed list of formals in the generic
357 -- copy. It is used to apply legality checks to the actuals. I_Node is the
358 -- instantiation node itself.
360 procedure Analyze_Subprogram_Instantiation
364 procedure Build_Instance_Compilation_Unit_Nodes
368 -- This procedure is used in the case where the generic instance of a
369 -- subprogram body or package body is a library unit. In this case, the
370 -- original library unit node for the generic instantiation must be
371 -- replaced by the resulting generic body, and a link made to a new
372 -- compilation unit node for the generic declaration. The argument N is
373 -- the original generic instantiation. Act_Body and Act_Decl are the body
374 -- and declaration of the instance (either package body and declaration
375 -- nodes or subprogram body and declaration nodes depending on the case).
376 -- On return, the node N has been rewritten with the actual body.
378 procedure Check_Access_Definition
(N
: Node_Id
);
379 -- Subsidiary routine to null exclusion processing. Perform an assertion
380 -- check on Ada version and the presence of an access definition in N.
382 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
383 -- Apply the following to all formal packages in generic associations
385 procedure Check_Formal_Package_Instance
386 (Formal_Pack
: Entity_Id
;
387 Actual_Pack
: Entity_Id
);
388 -- Verify that the actuals of the actual instance match the actuals of
389 -- the template for a formal package that is not declared with a box.
391 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
392 -- If the generic is a local entity and the corresponding body has not
393 -- been seen yet, flag enclosing packages to indicate that it will be
394 -- elaborated after the generic body. Subprograms declared in the same
395 -- package cannot be inlined by the front-end because front-end inlining
396 -- requires a strict linear order of elaboration.
398 procedure Check_Hidden_Child_Unit
400 Gen_Unit
: Entity_Id
;
401 Act_Decl_Id
: Entity_Id
);
402 -- If the generic unit is an implicit child instance within a parent
403 -- instance, we need to make an explicit test that it is not hidden by
404 -- a child instance of the same name and parent.
406 procedure Check_Generic_Actuals
407 (Instance
: Entity_Id
;
408 Is_Formal_Box
: Boolean);
409 -- Similar to previous one. Check the actuals in the instantiation,
410 -- whose views can change between the point of instantiation and the point
411 -- of instantiation of the body. In addition, mark the generic renamings
412 -- as generic actuals, so that they are not compatible with other actuals.
413 -- Recurse on an actual that is a formal package whose declaration has
416 function Contains_Instance_Of
419 N
: Node_Id
) return Boolean;
420 -- Inner is instantiated within the generic Outer. Check whether Inner
421 -- directly or indirectly contains an instance of Outer or of one of its
422 -- parents, in the case of a subunit. Each generic unit holds a list of
423 -- the entities instantiated within (at any depth). This procedure
424 -- determines whether the set of such lists contains a cycle, i.e. an
425 -- illegal circular instantiation.
427 function Denotes_Formal_Package
429 On_Exit
: Boolean := False;
430 Instance
: Entity_Id
:= Empty
) return Boolean;
431 -- Returns True if E is a formal package of an enclosing generic, or
432 -- the actual for such a formal in an enclosing instantiation. If such
433 -- a package is used as a formal in an nested generic, or as an actual
434 -- in a nested instantiation, the visibility of ITS formals should not
435 -- be modified. When called from within Restore_Private_Views, the flag
436 -- On_Exit is true, to indicate that the search for a possible enclosing
437 -- instance should ignore the current one. In that case Instance denotes
438 -- the declaration for which this is an actual. This declaration may be
439 -- an instantiation in the source, or the internal instantiation that
440 -- corresponds to the actual for a formal package.
442 function Find_Actual_Type
444 Gen_Type
: Entity_Id
) return Entity_Id
;
445 -- When validating the actual types of a child instance, check whether
446 -- the formal is a formal type of the parent unit, and retrieve the current
447 -- actual for it. Typ is the entity in the analyzed formal type declaration
448 -- (component or index type of an array type, or designated type of an
449 -- access formal) and Gen_Type is the enclosing analyzed formal array
450 -- or access type. The desired actual may be a formal of a parent, or may
451 -- be declared in a formal package of a parent. In both cases it is a
452 -- generic actual type because it appears within a visible instance.
453 -- Finally, it may be declared in a parent unit without being a formal
454 -- of that unit, in which case it must be retrieved by visibility.
455 -- Ambiguities may still arise if two homonyms are declared in two formal
456 -- packages, and the prefix of the formal type may be needed to resolve
457 -- the ambiguity in the instance ???
459 function In_Same_Declarative_Part
461 Inst
: Node_Id
) return Boolean;
462 -- True if the instantiation Inst and the given freeze_node F_Node appear
463 -- within the same declarative part, ignoring subunits, but with no inter-
464 -- vening subprograms or concurrent units. If true, the freeze node
465 -- of the instance can be placed after the freeze node of the parent,
466 -- which it itself an instance.
468 function In_Main_Context
(E
: Entity_Id
) return Boolean;
469 -- Check whether an instantiation is in the context of the main unit.
470 -- Used to determine whether its body should be elaborated to allow
471 -- front-end inlining.
473 procedure Set_Instance_Env
474 (Gen_Unit
: Entity_Id
;
475 Act_Unit
: Entity_Id
);
476 -- Save current instance on saved environment, to be used to determine
477 -- the global status of entities in nested instances. Part of Save_Env.
478 -- called after verifying that the generic unit is legal for the instance,
479 -- The procedure also examines whether the generic unit is a predefined
480 -- unit, in order to set configuration switches accordingly. As a result
481 -- the procedure must be called after analyzing and freezing the actuals.
483 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
484 -- Associate analyzed generic parameter with corresponding
485 -- instance. Used for semantic checks at instantiation time.
487 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
488 -- Traverse the Exchanged_Views list to see if a type was private
489 -- and has already been flipped during this phase of instantiation.
491 procedure Hide_Current_Scope
;
492 -- When instantiating a generic child unit, the parent context must be
493 -- present, but the instance and all entities that may be generated
494 -- must be inserted in the current scope. We leave the current scope
495 -- on the stack, but make its entities invisible to avoid visibility
496 -- problems. This is reversed at the end of the instantiation. This is
497 -- not done for the instantiation of the bodies, which only require the
498 -- instances of the generic parents to be in scope.
500 procedure Install_Body
505 -- If the instantiation happens textually before the body of the generic,
506 -- the instantiation of the body must be analyzed after the generic body,
507 -- and not at the point of instantiation. Such early instantiations can
508 -- happen if the generic and the instance appear in a package declaration
509 -- because the generic body can only appear in the corresponding package
510 -- body. Early instantiations can also appear if generic, instance and
511 -- body are all in the declarative part of a subprogram or entry. Entities
512 -- of packages that are early instantiations are delayed, and their freeze
513 -- node appears after the generic body.
515 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
516 -- Insert freeze node at the end of the declarative part that includes the
517 -- instance node N. If N is in the visible part of an enclosing package
518 -- declaration, the freeze node has to be inserted at the end of the
519 -- private declarations, if any.
521 procedure Freeze_Subprogram_Body
522 (Inst_Node
: Node_Id
;
524 Pack_Id
: Entity_Id
);
525 -- The generic body may appear textually after the instance, including
526 -- in the proper body of a stub, or within a different package instance.
527 -- Given that the instance can only be elaborated after the generic, we
528 -- place freeze_nodes for the instance and/or for packages that may enclose
529 -- the instance and the generic, so that the back-end can establish the
530 -- proper order of elaboration.
533 -- Establish environment for subsequent instantiation. Separated from
534 -- Save_Env because data-structures for visibility handling must be
535 -- initialized before call to Check_Generic_Child_Unit.
537 procedure Install_Formal_Packages
(Par
: Entity_Id
);
538 -- Install the visible part of any formal of the parent that is a formal
539 -- package. Note that for the case of a formal package with a box, this
540 -- includes the formal part of the formal package (12.7(10/2)).
542 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
543 -- When compiling an instance of a child unit the parent (which is
544 -- itself an instance) is an enclosing scope that must be made
545 -- immediately visible. This procedure is also used to install the non-
546 -- generic parent of a generic child unit when compiling its body, so
547 -- that full views of types in the parent are made visible.
549 procedure Remove_Parent
(In_Body
: Boolean := False);
550 -- Reverse effect after instantiation of child is complete
552 procedure Inline_Instance_Body
554 Gen_Unit
: Entity_Id
;
556 -- If front-end inlining is requested, instantiate the package body,
557 -- and preserve the visibility of its compilation unit, to insure
558 -- that successive instantiations succeed.
560 -- The functions Instantiate_XXX perform various legality checks and build
561 -- the declarations for instantiated generic parameters. In all of these
562 -- Formal is the entity in the generic unit, Actual is the entity of
563 -- expression in the generic associations, and Analyzed_Formal is the
564 -- formal in the generic copy, which contains the semantic information to
565 -- be used to validate the actual.
567 function Instantiate_Object
570 Analyzed_Formal
: Node_Id
) return List_Id
;
572 function Instantiate_Type
575 Analyzed_Formal
: Node_Id
;
576 Actual_Decls
: List_Id
) return List_Id
;
578 function Instantiate_Formal_Subprogram
581 Analyzed_Formal
: Node_Id
) return Node_Id
;
583 function Instantiate_Formal_Package
586 Analyzed_Formal
: Node_Id
) return List_Id
;
587 -- If the formal package is declared with a box, special visibility rules
588 -- apply to its formals: they are in the visible part of the package. This
589 -- is true in the declarative region of the formal package, that is to say
590 -- in the enclosing generic or instantiation. For an instantiation, the
591 -- parameters of the formal package are made visible in an explicit step.
592 -- Furthermore, if the actual has a visible USE clause, these formals must
593 -- be made potentially use-visible as well. On exit from the enclosing
594 -- instantiation, the reverse must be done.
596 -- For a formal package declared without a box, there are conformance rules
597 -- that apply to the actuals in the generic declaration and the actuals of
598 -- the actual package in the enclosing instantiation. The simplest way to
599 -- apply these rules is to repeat the instantiation of the formal package
600 -- in the context of the enclosing instance, and compare the generic
601 -- associations of this instantiation with those of the actual package.
602 -- This internal instantiation only needs to contain the renamings of the
603 -- formals: the visible and private declarations themselves need not be
606 -- In Ada 2005, the formal package may be only partially parameterized.
607 -- In that case the visibility step must make visible those actuals whose
608 -- corresponding formals were given with a box. A final complication
609 -- involves inherited operations from formal derived types, which must
610 -- be visible if the type is.
612 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
613 -- Test if given node is in the main unit
615 procedure Load_Parent_Of_Generic
618 Body_Optional
: Boolean := False);
619 -- If the generic appears in a separate non-generic library unit, load the
620 -- corresponding body to retrieve the body of the generic. N is the node
621 -- for the generic instantiation, Spec is the generic package declaration.
623 -- Body_Optional is a flag that indicates that the body is being loaded to
624 -- ensure that temporaries are generated consistently when there are other
625 -- instances in the current declarative part that precede the one being
626 -- loaded. In that case a missing body is acceptable.
628 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
629 -- Add the context clause of the unit containing a generic unit to a
630 -- compilation unit that is, or contains, an instantiation.
632 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
633 -- In order to propagate semantic information back from the analyzed copy
634 -- to the original generic, we maintain links between selected nodes in the
635 -- generic and their corresponding copies. At the end of generic analysis,
636 -- the routine Save_Global_References traverses the generic tree, examines
637 -- the semantic information, and preserves the links to those nodes that
638 -- contain global information. At instantiation, the information from the
639 -- associated node is placed on the new copy, so that name resolution is
642 -- Three kinds of source nodes have associated nodes:
644 -- a) those that can reference (denote) entities, that is identifiers,
645 -- character literals, expanded_names, operator symbols, operators,
646 -- and attribute reference nodes. These nodes have an Entity field
647 -- and are the set of nodes that are in N_Has_Entity.
649 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
651 -- c) selected components (N_Selected_Component)
653 -- For the first class, the associated node preserves the entity if it is
654 -- global. If the generic contains nested instantiations, the associated
655 -- node itself has been recopied, and a chain of them must be followed.
657 -- For aggregates, the associated node allows retrieval of the type, which
658 -- may otherwise not appear in the generic. The view of this type may be
659 -- different between generic and instantiation, and the full view can be
660 -- installed before the instantiation is analyzed. For aggregates of type
661 -- extensions, the same view exchange may have to be performed for some of
662 -- the ancestor types, if their view is private at the point of
665 -- Nodes that are selected components in the parse tree may be rewritten
666 -- as expanded names after resolution, and must be treated as potential
667 -- entity holders, which is why they also have an Associated_Node.
669 -- Nodes that do not come from source, such as freeze nodes, do not appear
670 -- in the generic tree, and need not have an associated node.
672 -- The associated node is stored in the Associated_Node field. Note that
673 -- this field overlaps Entity, which is fine, because the whole point is
674 -- that we don't need or want the normal Entity field in this situation.
676 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
677 -- Within the generic part, entities in the formal package are
678 -- visible. To validate subsequent type declarations, indicate
679 -- the correspondence between the entities in the analyzed formal,
680 -- and the entities in the actual package. There are three packages
681 -- involved in the instantiation of a formal package: the parent
682 -- generic P1 which appears in the generic declaration, the fake
683 -- instantiation P2 which appears in the analyzed generic, and whose
684 -- visible entities may be used in subsequent formals, and the actual
685 -- P3 in the instance. To validate subsequent formals, me indicate
686 -- that the entities in P2 are mapped into those of P3. The mapping of
687 -- entities has to be done recursively for nested packages.
689 procedure Move_Freeze_Nodes
693 -- Freeze nodes can be generated in the analysis of a generic unit, but
694 -- will not be seen by the back-end. It is necessary to move those nodes
695 -- to the enclosing scope if they freeze an outer entity. We place them
696 -- at the end of the enclosing generic package, which is semantically
699 procedure Preanalyze_Actuals
(N
: Node_Id
);
700 -- Analyze actuals to perform name resolution. Full resolution is done
701 -- later, when the expected types are known, but names have to be captured
702 -- before installing parents of generics, that are not visible for the
703 -- actuals themselves.
705 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
706 -- Verify that an attribute that appears as the default for a formal
707 -- subprogram is a function or procedure with the correct profile.
709 -------------------------------------------
710 -- Data Structures for Generic Renamings --
711 -------------------------------------------
713 -- The map Generic_Renamings associates generic entities with their
714 -- corresponding actuals. Currently used to validate type instances. It
715 -- will eventually be used for all generic parameters to eliminate the
716 -- need for overload resolution in the instance.
718 type Assoc_Ptr
is new Int
;
720 Assoc_Null
: constant Assoc_Ptr
:= -1;
725 Next_In_HTable
: Assoc_Ptr
;
728 package Generic_Renamings
is new Table
.Table
729 (Table_Component_Type
=> Assoc
,
730 Table_Index_Type
=> Assoc_Ptr
,
731 Table_Low_Bound
=> 0,
733 Table_Increment
=> 100,
734 Table_Name
=> "Generic_Renamings");
736 -- Variable to hold enclosing instantiation. When the environment is
737 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
739 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
741 -- Hash table for associations
743 HTable_Size
: constant := 37;
744 type HTable_Range
is range 0 .. HTable_Size
- 1;
746 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
747 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
748 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
749 function Hash
(F
: Entity_Id
) return HTable_Range
;
751 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
752 Header_Num
=> HTable_Range
,
754 Elmt_Ptr
=> Assoc_Ptr
,
755 Null_Ptr
=> Assoc_Null
,
756 Set_Next
=> Set_Next_Assoc
,
759 Get_Key
=> Get_Gen_Id
,
763 Exchanged_Views
: Elist_Id
;
764 -- This list holds the private views that have been exchanged during
765 -- instantiation to restore the visibility of the generic declaration.
766 -- (see comments above). After instantiation, the current visibility is
767 -- reestablished by means of a traversal of this list.
769 Hidden_Entities
: Elist_Id
;
770 -- This list holds the entities of the current scope that are removed
771 -- from immediate visibility when instantiating a child unit. Their
772 -- visibility is restored in Remove_Parent.
774 -- Because instantiations can be recursive, the following must be saved
775 -- on entry and restored on exit from an instantiation (spec or body).
776 -- This is done by the two procedures Save_Env and Restore_Env. For
777 -- package and subprogram instantiations (but not for the body instances)
778 -- the action of Save_Env is done in two steps: Init_Env is called before
779 -- Check_Generic_Child_Unit, because setting the parent instances requires
780 -- that the visibility data structures be properly initialized. Once the
781 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
783 Parent_Unit_Visible
: Boolean := False;
784 -- Parent_Unit_Visible is used when the generic is a child unit, and
785 -- indicates whether the ultimate parent of the generic is visible in the
786 -- instantiation environment. It is used to reset the visibility of the
787 -- parent at the end of the instantiation (see Remove_Parent).
789 Instance_Parent_Unit
: Entity_Id
:= Empty
;
790 -- This records the ultimate parent unit of an instance of a generic
791 -- child unit and is used in conjunction with Parent_Unit_Visible to
792 -- indicate the unit to which the Parent_Unit_Visible flag corresponds.
794 type Instance_Env
is record
795 Instantiated_Parent
: Assoc
;
796 Exchanged_Views
: Elist_Id
;
797 Hidden_Entities
: Elist_Id
;
798 Current_Sem_Unit
: Unit_Number_Type
;
799 Parent_Unit_Visible
: Boolean := False;
800 Instance_Parent_Unit
: Entity_Id
:= Empty
;
801 Switches
: Config_Switches_Type
;
804 package Instance_Envs
is new Table
.Table
(
805 Table_Component_Type
=> Instance_Env
,
806 Table_Index_Type
=> Int
,
807 Table_Low_Bound
=> 0,
809 Table_Increment
=> 100,
810 Table_Name
=> "Instance_Envs");
812 procedure Restore_Private_Views
813 (Pack_Id
: Entity_Id
;
814 Is_Package
: Boolean := True);
815 -- Restore the private views of external types, and unmark the generic
816 -- renamings of actuals, so that they become compatible subtypes again.
817 -- For subprograms, Pack_Id is the package constructed to hold the
820 procedure Switch_View
(T
: Entity_Id
);
821 -- Switch the partial and full views of a type and its private
822 -- dependents (i.e. its subtypes and derived types).
824 ------------------------------------
825 -- Structures for Error Reporting --
826 ------------------------------------
828 Instantiation_Node
: Node_Id
;
829 -- Used by subprograms that validate instantiation of formal parameters
830 -- where there might be no actual on which to place the error message.
831 -- Also used to locate the instantiation node for generic subunits.
833 Instantiation_Error
: exception;
834 -- When there is a semantic error in the generic parameter matching,
835 -- there is no point in continuing the instantiation, because the
836 -- number of cascaded errors is unpredictable. This exception aborts
837 -- the instantiation process altogether.
839 S_Adjustment
: Sloc_Adjustment
;
840 -- Offset created for each node in an instantiation, in order to keep
841 -- track of the source position of the instantiation in each of its nodes.
842 -- A subsequent semantic error or warning on a construct of the instance
843 -- points to both places: the original generic node, and the point of
844 -- instantiation. See Sinput and Sinput.L for additional details.
846 ------------------------------------------------------------
847 -- Data structure for keeping track when inside a Generic --
848 ------------------------------------------------------------
850 -- The following table is used to save values of the Inside_A_Generic
851 -- flag (see spec of Sem) when they are saved by Start_Generic.
853 package Generic_Flags
is new Table
.Table
(
854 Table_Component_Type
=> Boolean,
855 Table_Index_Type
=> Int
,
856 Table_Low_Bound
=> 0,
858 Table_Increment
=> 200,
859 Table_Name
=> "Generic_Flags");
861 ---------------------------
862 -- Abandon_Instantiation --
863 ---------------------------
865 procedure Abandon_Instantiation
(N
: Node_Id
) is
867 Error_Msg_N
("\instantiation abandoned!", N
);
868 raise Instantiation_Error
;
869 end Abandon_Instantiation
;
871 --------------------------
872 -- Analyze_Associations --
873 --------------------------
875 function Analyze_Associations
878 F_Copy
: List_Id
) return List_Id
881 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
882 Assoc
: constant List_Id
:= New_List
;
883 Default_Actuals
: constant Elist_Id
:= New_Elmt_List
;
884 Gen_Unit
: constant Entity_Id
:=
885 Defining_Entity
(Parent
(F_Copy
));
890 Next_Formal
: Node_Id
;
891 Temp_Formal
: Node_Id
;
892 Analyzed_Formal
: Node_Id
;
895 First_Named
: Node_Id
:= Empty
;
897 Default_Formals
: constant List_Id
:= New_List
;
898 -- If an Others_Choice is present, some of the formals may be defaulted.
899 -- To simplify the treatment of visibility in an instance, we introduce
900 -- individual defaults for each such formal. These defaults are
901 -- appended to the list of associations and replace the Others_Choice.
903 Found_Assoc
: Node_Id
;
904 -- Association for the current formal being match. Empty if there are
905 -- no remaining actuals, or if there is no named association with the
906 -- name of the formal.
908 Is_Named_Assoc
: Boolean;
909 Num_Matched
: Int
:= 0;
910 Num_Actuals
: Int
:= 0;
912 Others_Present
: Boolean := False;
913 -- In Ada 2005, indicates partial parametrization of a formal
914 -- package. As usual an other association must be last in the list.
916 function Matching_Actual
918 A_F
: Entity_Id
) return Node_Id
;
919 -- Find actual that corresponds to a given a formal parameter. If the
920 -- actuals are positional, return the next one, if any. If the actuals
921 -- are named, scan the parameter associations to find the right one.
922 -- A_F is the corresponding entity in the analyzed generic,which is
923 -- placed on the selector name for ASIS use.
925 -- In Ada 2005, a named association may be given with a box, in which
926 -- case Matching_Actual sets Found_Assoc to the generic association,
927 -- but return Empty for the actual itself. In this case the code below
928 -- creates a corresponding declaration for the formal.
930 function Partial_Parametrization
return Boolean;
931 -- Ada 2005: if no match is found for a given formal, check if the
932 -- association for it includes a box, or whether the associations
933 -- include an Others clause.
935 procedure Process_Default
(F
: Entity_Id
);
936 -- Add a copy of the declaration of generic formal F to the list of
937 -- associations, and add an explicit box association for F if there
938 -- is none yet, and the default comes from an Others_Choice.
940 procedure Set_Analyzed_Formal
;
941 -- Find the node in the generic copy that corresponds to a given formal.
942 -- The semantic information on this node is used to perform legality
943 -- checks on the actuals. Because semantic analysis can introduce some
944 -- anonymous entities or modify the declaration node itself, the
945 -- correspondence between the two lists is not one-one. In addition to
946 -- anonymous types, the presence a formal equality will introduce an
947 -- implicit declaration for the corresponding inequality.
949 ---------------------
950 -- Matching_Actual --
951 ---------------------
953 function Matching_Actual
955 A_F
: Entity_Id
) return Node_Id
961 Is_Named_Assoc
:= False;
963 -- End of list of purely positional parameters
965 if No
(Actual
) or else Nkind
(Actual
) = N_Others_Choice
then
966 Found_Assoc
:= Empty
;
969 -- Case of positional parameter corresponding to current formal
971 elsif No
(Selector_Name
(Actual
)) then
972 Found_Assoc
:= Actual
;
973 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
974 Num_Matched
:= Num_Matched
+ 1;
977 -- Otherwise scan list of named actuals to find the one with the
978 -- desired name. All remaining actuals have explicit names.
981 Is_Named_Assoc
:= True;
982 Found_Assoc
:= Empty
;
986 while Present
(Actual
) loop
987 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
988 Set_Entity
(Selector_Name
(Actual
), A_F
);
989 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
990 Generate_Reference
(A_F
, Selector_Name
(Actual
));
991 Found_Assoc
:= Actual
;
992 Act
:= Explicit_Generic_Actual_Parameter
(Actual
);
993 Num_Matched
:= Num_Matched
+ 1;
1001 -- Reset for subsequent searches. In most cases the named
1002 -- associations are in order. If they are not, we reorder them
1003 -- to avoid scanning twice the same actual. This is not just a
1004 -- question of efficiency: there may be multiple defaults with
1005 -- boxes that have the same name. In a nested instantiation we
1006 -- insert actuals for those defaults, and cannot rely on their
1007 -- names to disambiguate them.
1009 if Actual
= First_Named
then
1012 elsif Present
(Actual
) then
1013 Insert_Before
(First_Named
, Remove_Next
(Prev
));
1016 Actual
:= First_Named
;
1019 if Is_Entity_Name
(Act
) and then Present
(Entity
(Act
)) then
1020 Set_Used_As_Generic_Actual
(Entity
(Act
));
1024 end Matching_Actual
;
1026 -----------------------------
1027 -- Partial_Parametrization --
1028 -----------------------------
1030 function Partial_Parametrization
return Boolean is
1032 return Others_Present
1033 or else (Present
(Found_Assoc
) and then Box_Present
(Found_Assoc
));
1034 end Partial_Parametrization
;
1036 ---------------------
1037 -- Process_Default --
1038 ---------------------
1040 procedure Process_Default
(F
: Entity_Id
) is
1041 Loc
: constant Source_Ptr
:= Sloc
(I_Node
);
1042 F_Id
: constant Entity_Id
:= Defining_Entity
(F
);
1048 -- Append copy of formal declaration to associations, and create new
1049 -- defining identifier for it.
1051 Decl
:= New_Copy_Tree
(F
);
1052 Id
:= Make_Defining_Identifier
(Sloc
(F_Id
), Chars
(F_Id
));
1054 if Nkind
(F
) in N_Formal_Subprogram_Declaration
then
1055 Set_Defining_Unit_Name
(Specification
(Decl
), Id
);
1058 Set_Defining_Identifier
(Decl
, Id
);
1061 Append
(Decl
, Assoc
);
1063 if No
(Found_Assoc
) then
1065 Make_Generic_Association
(Loc
,
1066 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
),
1067 Explicit_Generic_Actual_Parameter
=> Empty
);
1068 Set_Box_Present
(Default
);
1069 Append
(Default
, Default_Formals
);
1071 end Process_Default
;
1073 -------------------------
1074 -- Set_Analyzed_Formal --
1075 -------------------------
1077 procedure Set_Analyzed_Formal
is
1081 while Present
(Analyzed_Formal
) loop
1082 Kind
:= Nkind
(Analyzed_Formal
);
1084 case Nkind
(Formal
) is
1086 when N_Formal_Subprogram_Declaration
=>
1087 exit when Kind
in N_Formal_Subprogram_Declaration
1090 (Defining_Unit_Name
(Specification
(Formal
))) =
1092 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1094 when N_Formal_Package_Declaration
=>
1095 exit when Nkind_In
(Kind
, N_Formal_Package_Declaration
,
1096 N_Generic_Package_Declaration
,
1097 N_Package_Declaration
);
1099 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
1103 -- Skip freeze nodes, and nodes inserted to replace
1104 -- unrecognized pragmas.
1107 Kind
not in N_Formal_Subprogram_Declaration
1108 and then not Nkind_In
(Kind
, N_Subprogram_Declaration
,
1112 and then Chars
(Defining_Identifier
(Formal
)) =
1113 Chars
(Defining_Identifier
(Analyzed_Formal
));
1116 Next
(Analyzed_Formal
);
1118 end Set_Analyzed_Formal
;
1120 -- Start of processing for Analyze_Associations
1123 Actuals
:= Generic_Associations
(I_Node
);
1125 if Present
(Actuals
) then
1127 -- Check for an Others choice, indicating a partial parametrization
1128 -- for a formal package.
1130 Actual
:= First
(Actuals
);
1131 while Present
(Actual
) loop
1132 if Nkind
(Actual
) = N_Others_Choice
then
1133 Others_Present
:= True;
1135 if Present
(Next
(Actual
)) then
1136 Error_Msg_N
("others must be last association", Actual
);
1139 -- This subprogram is used both for formal packages and for
1140 -- instantiations. For the latter, associations must all be
1143 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
1144 and then Comes_From_Source
(I_Node
)
1147 ("others association not allowed in an instance",
1151 -- In any case, nothing to do after the others association
1155 elsif Box_Present
(Actual
)
1156 and then Comes_From_Source
(I_Node
)
1157 and then Nkind
(I_Node
) /= N_Formal_Package_Declaration
1160 ("box association not allowed in an instance", Actual
);
1166 -- If named associations are present, save first named association
1167 -- (it may of course be Empty) to facilitate subsequent name search.
1169 First_Named
:= First
(Actuals
);
1170 while Present
(First_Named
)
1171 and then Nkind
(First_Named
) /= N_Others_Choice
1172 and then No
(Selector_Name
(First_Named
))
1174 Num_Actuals
:= Num_Actuals
+ 1;
1179 Named
:= First_Named
;
1180 while Present
(Named
) loop
1181 if Nkind
(Named
) /= N_Others_Choice
1182 and then No
(Selector_Name
(Named
))
1184 Error_Msg_N
("invalid positional actual after named one", Named
);
1185 Abandon_Instantiation
(Named
);
1188 -- A named association may lack an actual parameter, if it was
1189 -- introduced for a default subprogram that turns out to be local
1190 -- to the outer instantiation.
1192 if Nkind
(Named
) /= N_Others_Choice
1193 and then Present
(Explicit_Generic_Actual_Parameter
(Named
))
1195 Num_Actuals
:= Num_Actuals
+ 1;
1201 if Present
(Formals
) then
1202 Formal
:= First_Non_Pragma
(Formals
);
1203 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
1205 if Present
(Actuals
) then
1206 Actual
:= First
(Actuals
);
1208 -- All formals should have default values
1214 while Present
(Formal
) loop
1215 Set_Analyzed_Formal
;
1216 Next_Formal
:= Next_Non_Pragma
(Formal
);
1218 case Nkind
(Formal
) is
1219 when N_Formal_Object_Declaration
=>
1222 Defining_Identifier
(Formal
),
1223 Defining_Identifier
(Analyzed_Formal
));
1225 if No
(Match
) and then Partial_Parametrization
then
1226 Process_Default
(Formal
);
1229 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
1233 when N_Formal_Type_Declaration
=>
1236 Defining_Identifier
(Formal
),
1237 Defining_Identifier
(Analyzed_Formal
));
1240 if Partial_Parametrization
then
1241 Process_Default
(Formal
);
1244 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1248 Defining_Identifier
(Formal
));
1249 Error_Msg_NE
("\in instantiation of & declared#",
1250 Instantiation_Node
, Gen_Unit
);
1251 Abandon_Instantiation
(Instantiation_Node
);
1258 (Formal
, Match
, Analyzed_Formal
, Assoc
),
1261 -- An instantiation is a freeze point for the actuals,
1262 -- unless this is a rewritten formal package.
1264 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1265 Append_Elmt
(Entity
(Match
), Actual_Types
);
1269 -- A remote access-to-class-wide type must not be an
1270 -- actual parameter for a generic formal of an access
1271 -- type (E.2.2 (17)).
1273 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1275 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1276 N_Access_To_Object_Definition
1278 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1281 when N_Formal_Subprogram_Declaration
=>
1284 Defining_Unit_Name
(Specification
(Formal
)),
1285 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1287 -- If the formal subprogram has the same name as another
1288 -- formal subprogram of the generic, then a named
1289 -- association is illegal (12.3(9)). Exclude named
1290 -- associations that are generated for a nested instance.
1293 and then Is_Named_Assoc
1294 and then Comes_From_Source
(Found_Assoc
)
1296 Temp_Formal
:= First
(Formals
);
1297 while Present
(Temp_Formal
) loop
1298 if Nkind
(Temp_Formal
) in
1299 N_Formal_Subprogram_Declaration
1300 and then Temp_Formal
/= Formal
1302 Chars
(Selector_Name
(Found_Assoc
)) =
1303 Chars
(Defining_Unit_Name
1304 (Specification
(Temp_Formal
)))
1307 ("name not allowed for overloaded formal",
1309 Abandon_Instantiation
(Instantiation_Node
);
1316 -- If there is no corresponding actual, this may be case of
1317 -- partial parametrization, or else the formal has a default
1321 and then Partial_Parametrization
1323 Process_Default
(Formal
);
1326 Instantiate_Formal_Subprogram
1327 (Formal
, Match
, Analyzed_Formal
));
1330 -- If this is a nested generic, preserve default for later
1334 and then Box_Present
(Formal
)
1337 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1341 when N_Formal_Package_Declaration
=>
1344 Defining_Identifier
(Formal
),
1345 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1348 if Partial_Parametrization
then
1349 Process_Default
(Formal
);
1352 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1355 Instantiation_Node
, Defining_Identifier
(Formal
));
1356 Error_Msg_NE
("\in instantiation of & declared#",
1357 Instantiation_Node
, Gen_Unit
);
1359 Abandon_Instantiation
(Instantiation_Node
);
1365 (Instantiate_Formal_Package
1366 (Formal
, Match
, Analyzed_Formal
),
1370 -- For use type and use package appearing in the generic part,
1371 -- we have already copied them, so we can just move them where
1372 -- they belong (we mustn't recopy them since this would mess up
1373 -- the Sloc values).
1375 when N_Use_Package_Clause |
1376 N_Use_Type_Clause
=>
1377 if Nkind
(Original_Node
(I_Node
)) =
1378 N_Formal_Package_Declaration
1380 Append
(New_Copy_Tree
(Formal
), Assoc
);
1383 Append
(Formal
, Assoc
);
1387 raise Program_Error
;
1391 Formal
:= Next_Formal
;
1392 Next_Non_Pragma
(Analyzed_Formal
);
1395 if Num_Actuals
> Num_Matched
then
1396 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1398 if Present
(Selector_Name
(Actual
)) then
1400 ("unmatched actual&",
1401 Actual
, Selector_Name
(Actual
));
1402 Error_Msg_NE
("\in instantiation of& declared#",
1406 ("unmatched actual in instantiation of& declared#",
1411 elsif Present
(Actuals
) then
1413 ("too many actuals in generic instantiation", Instantiation_Node
);
1417 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1419 while Present
(Elmt
) loop
1420 Freeze_Before
(I_Node
, Node
(Elmt
));
1425 -- If there are default subprograms, normalize the tree by adding
1426 -- explicit associations for them. This is required if the instance
1427 -- appears within a generic.
1435 Elmt
:= First_Elmt
(Default_Actuals
);
1436 while Present
(Elmt
) loop
1437 if No
(Actuals
) then
1438 Actuals
:= New_List
;
1439 Set_Generic_Associations
(I_Node
, Actuals
);
1442 Subp
:= Node
(Elmt
);
1444 Make_Generic_Association
(Sloc
(Subp
),
1445 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1446 Explicit_Generic_Actual_Parameter
=>
1447 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1448 Mark_Rewrite_Insertion
(New_D
);
1449 Append_To
(Actuals
, New_D
);
1454 -- If this is a formal package, normalize the parameter list by adding
1455 -- explicit box associations for the formals that are covered by an
1458 if not Is_Empty_List
(Default_Formals
) then
1459 Append_List
(Default_Formals
, Formals
);
1463 end Analyze_Associations
;
1465 -------------------------------
1466 -- Analyze_Formal_Array_Type --
1467 -------------------------------
1469 procedure Analyze_Formal_Array_Type
1470 (T
: in out Entity_Id
;
1476 -- Treated like a non-generic array declaration, with additional
1481 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1482 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1483 while Present
(DSS
) loop
1484 if Nkind_In
(DSS
, N_Subtype_Indication
,
1486 N_Attribute_Reference
)
1488 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1495 Array_Type_Declaration
(T
, Def
);
1496 Set_Is_Generic_Type
(Base_Type
(T
));
1498 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1499 and then No
(Full_View
(Component_Type
(T
)))
1501 Error_Msg_N
("premature usage of incomplete type", Def
);
1503 -- Check that range constraint is not allowed on the component type
1504 -- of a generic formal array type (AARM 12.5.3(3))
1506 elsif Is_Internal
(Component_Type
(T
))
1507 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1508 and then Nkind
(Original_Node
1509 (Subtype_Indication
(Component_Definition
(Def
)))) =
1510 N_Subtype_Indication
1513 ("in a formal, a subtype indication can only be "
1514 & "a subtype mark (RM 12.5.3(3))",
1515 Subtype_Indication
(Component_Definition
(Def
)));
1518 end Analyze_Formal_Array_Type
;
1520 ---------------------------------------------
1521 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1522 ---------------------------------------------
1524 -- As for other generic types, we create a valid type representation with
1525 -- legal but arbitrary attributes, whose values are never considered
1526 -- static. For all scalar types we introduce an anonymous base type, with
1527 -- the same attributes. We choose the corresponding integer type to be
1528 -- Standard_Integer.
1530 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1534 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1535 Base
: constant Entity_Id
:=
1537 (E_Decimal_Fixed_Point_Type
,
1538 Current_Scope
, Sloc
(Def
), 'G');
1539 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1540 Delta_Val
: constant Ureal
:= Ureal_1
;
1541 Digs_Val
: constant Uint
:= Uint_6
;
1546 Set_Etype
(Base
, Base
);
1547 Set_Size_Info
(Base
, Int_Base
);
1548 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1549 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1550 Set_Digits_Value
(Base
, Digs_Val
);
1551 Set_Delta_Value
(Base
, Delta_Val
);
1552 Set_Small_Value
(Base
, Delta_Val
);
1553 Set_Scalar_Range
(Base
,
1555 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1556 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1558 Set_Is_Generic_Type
(Base
);
1559 Set_Parent
(Base
, Parent
(Def
));
1561 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1562 Set_Etype
(T
, Base
);
1563 Set_Size_Info
(T
, Int_Base
);
1564 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1565 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1566 Set_Digits_Value
(T
, Digs_Val
);
1567 Set_Delta_Value
(T
, Delta_Val
);
1568 Set_Small_Value
(T
, Delta_Val
);
1569 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1570 Set_Is_Constrained
(T
);
1572 Check_Restriction
(No_Fixed_Point
, Def
);
1573 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1575 -------------------------------------------
1576 -- Analyze_Formal_Derived_Interface_Type --
1577 -------------------------------------------
1579 procedure Analyze_Formal_Derived_Interface_Type
1584 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1587 -- Rewrite as a type declaration of a derived type. This ensures that
1588 -- the interface list and primitive operations are properly captured.
1591 Make_Full_Type_Declaration
(Loc
,
1592 Defining_Identifier
=> T
,
1593 Type_Definition
=> Def
));
1595 Set_Is_Generic_Type
(T
);
1596 end Analyze_Formal_Derived_Interface_Type
;
1598 ---------------------------------
1599 -- Analyze_Formal_Derived_Type --
1600 ---------------------------------
1602 procedure Analyze_Formal_Derived_Type
1607 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1608 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1612 Set_Is_Generic_Type
(T
);
1614 if Private_Present
(Def
) then
1616 Make_Private_Extension_Declaration
(Loc
,
1617 Defining_Identifier
=> T
,
1618 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1619 Unknown_Discriminants_Present
=> Unk_Disc
,
1620 Subtype_Indication
=> Subtype_Mark
(Def
),
1621 Interface_List
=> Interface_List
(Def
));
1623 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1624 Set_Limited_Present
(New_N
, Limited_Present
(Def
));
1625 Set_Synchronized_Present
(New_N
, Synchronized_Present
(Def
));
1629 Make_Full_Type_Declaration
(Loc
,
1630 Defining_Identifier
=> T
,
1631 Discriminant_Specifications
=>
1632 Discriminant_Specifications
(Parent
(T
)),
1634 Make_Derived_Type_Definition
(Loc
,
1635 Subtype_Indication
=> Subtype_Mark
(Def
)));
1637 Set_Abstract_Present
1638 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1640 (Type_Definition
(New_N
), Limited_Present
(Def
));
1647 if not Is_Composite_Type
(T
) then
1649 ("unknown discriminants not allowed for elementary types", N
);
1651 Set_Has_Unknown_Discriminants
(T
);
1652 Set_Is_Constrained
(T
, False);
1656 -- If the parent type has a known size, so does the formal, which makes
1657 -- legal representation clauses that involve the formal.
1659 Set_Size_Known_At_Compile_Time
1660 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1661 end Analyze_Formal_Derived_Type
;
1663 ----------------------------------
1664 -- Analyze_Formal_Discrete_Type --
1665 ----------------------------------
1667 -- The operations defined for a discrete types are those of an enumeration
1668 -- type. The size is set to an arbitrary value, for use in analyzing the
1671 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1672 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1676 Base
: constant Entity_Id
:=
1678 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1681 Set_Ekind
(T
, E_Enumeration_Subtype
);
1682 Set_Etype
(T
, Base
);
1685 Set_Is_Generic_Type
(T
);
1686 Set_Is_Constrained
(T
);
1688 -- For semantic analysis, the bounds of the type must be set to some
1689 -- non-static value. The simplest is to create attribute nodes for those
1690 -- bounds, that refer to the type itself. These bounds are never
1691 -- analyzed but serve as place-holders.
1694 Make_Attribute_Reference
(Loc
,
1695 Attribute_Name
=> Name_First
,
1696 Prefix
=> New_Reference_To
(T
, Loc
));
1700 Make_Attribute_Reference
(Loc
,
1701 Attribute_Name
=> Name_Last
,
1702 Prefix
=> New_Reference_To
(T
, Loc
));
1705 Set_Scalar_Range
(T
,
1710 Set_Ekind
(Base
, E_Enumeration_Type
);
1711 Set_Etype
(Base
, Base
);
1712 Init_Size
(Base
, 8);
1713 Init_Alignment
(Base
);
1714 Set_Is_Generic_Type
(Base
);
1715 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1716 Set_Parent
(Base
, Parent
(Def
));
1717 end Analyze_Formal_Discrete_Type
;
1719 ----------------------------------
1720 -- Analyze_Formal_Floating_Type --
1721 ---------------------------------
1723 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1724 Base
: constant Entity_Id
:=
1726 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1729 -- The various semantic attributes are taken from the predefined type
1730 -- Float, just so that all of them are initialized. Their values are
1731 -- never used because no constant folding or expansion takes place in
1732 -- the generic itself.
1735 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1736 Set_Etype
(T
, Base
);
1737 Set_Size_Info
(T
, (Standard_Float
));
1738 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1739 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1740 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1741 Set_Is_Constrained
(T
);
1743 Set_Is_Generic_Type
(Base
);
1744 Set_Etype
(Base
, Base
);
1745 Set_Size_Info
(Base
, (Standard_Float
));
1746 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1747 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1748 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1749 Set_Parent
(Base
, Parent
(Def
));
1751 Check_Restriction
(No_Floating_Point
, Def
);
1752 end Analyze_Formal_Floating_Type
;
1754 -----------------------------------
1755 -- Analyze_Formal_Interface_Type;--
1756 -----------------------------------
1758 procedure Analyze_Formal_Interface_Type
1763 Loc
: constant Source_Ptr
:= Sloc
(N
);
1768 Make_Full_Type_Declaration
(Loc
,
1769 Defining_Identifier
=> T
,
1770 Type_Definition
=> Def
);
1774 Set_Is_Generic_Type
(T
);
1775 end Analyze_Formal_Interface_Type
;
1777 ---------------------------------
1778 -- Analyze_Formal_Modular_Type --
1779 ---------------------------------
1781 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1783 -- Apart from their entity kind, generic modular types are treated like
1784 -- signed integer types, and have the same attributes.
1786 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1787 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1788 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1790 end Analyze_Formal_Modular_Type
;
1792 ---------------------------------------
1793 -- Analyze_Formal_Object_Declaration --
1794 ---------------------------------------
1796 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1797 E
: constant Node_Id
:= Default_Expression
(N
);
1798 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1805 -- Determine the mode of the formal object
1807 if Out_Present
(N
) then
1808 K
:= E_Generic_In_Out_Parameter
;
1810 if not In_Present
(N
) then
1811 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1815 K
:= E_Generic_In_Parameter
;
1818 if Present
(Subtype_Mark
(N
)) then
1819 Find_Type
(Subtype_Mark
(N
));
1820 T
:= Entity
(Subtype_Mark
(N
));
1822 -- Verify that there is no redundant null exclusion
1824 if Null_Exclusion_Present
(N
) then
1825 if not Is_Access_Type
(T
) then
1827 ("null exclusion can only apply to an access type", N
);
1829 elsif Can_Never_Be_Null
(T
) then
1831 ("`NOT NULL` not allowed (& already excludes null)",
1836 -- Ada 2005 (AI-423): Formal object with an access definition
1839 Check_Access_Definition
(N
);
1840 T
:= Access_Definition
1842 N
=> Access_Definition
(N
));
1845 if Ekind
(T
) = E_Incomplete_Type
then
1847 Error_Node
: Node_Id
;
1850 if Present
(Subtype_Mark
(N
)) then
1851 Error_Node
:= Subtype_Mark
(N
);
1853 Check_Access_Definition
(N
);
1854 Error_Node
:= Access_Definition
(N
);
1857 Error_Msg_N
("premature usage of incomplete type", Error_Node
);
1861 if K
= E_Generic_In_Parameter
then
1863 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1865 if Ada_Version
< Ada_2005
and then Is_Limited_Type
(T
) then
1867 ("generic formal of mode IN must not be of limited type", N
);
1868 Explain_Limited_Type
(T
, N
);
1871 if Is_Abstract_Type
(T
) then
1873 ("generic formal of mode IN must not be of abstract type", N
);
1877 Preanalyze_Spec_Expression
(E
, T
);
1879 if Is_Limited_Type
(T
) and then not OK_For_Limited_Init
(T
, E
) then
1881 ("initialization not allowed for limited types", E
);
1882 Explain_Limited_Type
(T
, E
);
1889 -- Case of generic IN OUT parameter
1892 -- If the formal has an unconstrained type, construct its actual
1893 -- subtype, as is done for subprogram formals. In this fashion, all
1894 -- its uses can refer to specific bounds.
1899 if (Is_Array_Type
(T
)
1900 and then not Is_Constrained
(T
))
1902 (Ekind
(T
) = E_Record_Type
1903 and then Has_Discriminants
(T
))
1906 Non_Freezing_Ref
: constant Node_Id
:=
1907 New_Reference_To
(Id
, Sloc
(Id
));
1911 -- Make sure the actual subtype doesn't generate bogus freezing
1913 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1914 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1915 Insert_Before_And_Analyze
(N
, Decl
);
1916 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1919 Set_Actual_Subtype
(Id
, T
);
1924 ("initialization not allowed for `IN OUT` formals", N
);
1928 Analyze_Aspect_Specifications
(N
, Id
, Aspect_Specifications
(N
));
1929 end Analyze_Formal_Object_Declaration
;
1931 ----------------------------------------------
1932 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1933 ----------------------------------------------
1935 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1939 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1940 Base
: constant Entity_Id
:=
1942 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1944 -- The semantic attributes are set for completeness only, their values
1945 -- will never be used, since all properties of the type are non-static.
1948 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1949 Set_Etype
(T
, Base
);
1950 Set_Size_Info
(T
, Standard_Integer
);
1951 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1952 Set_Small_Value
(T
, Ureal_1
);
1953 Set_Delta_Value
(T
, Ureal_1
);
1954 Set_Scalar_Range
(T
,
1956 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1957 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1958 Set_Is_Constrained
(T
);
1960 Set_Is_Generic_Type
(Base
);
1961 Set_Etype
(Base
, Base
);
1962 Set_Size_Info
(Base
, Standard_Integer
);
1963 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1964 Set_Small_Value
(Base
, Ureal_1
);
1965 Set_Delta_Value
(Base
, Ureal_1
);
1966 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1967 Set_Parent
(Base
, Parent
(Def
));
1969 Check_Restriction
(No_Fixed_Point
, Def
);
1970 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1972 ----------------------------------------
1973 -- Analyze_Formal_Package_Declaration --
1974 ----------------------------------------
1976 procedure Analyze_Formal_Package_Declaration
(N
: Node_Id
) is
1977 Loc
: constant Source_Ptr
:= Sloc
(N
);
1978 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1980 Gen_Id
: constant Node_Id
:= Name
(N
);
1982 Gen_Unit
: Entity_Id
;
1984 Parent_Installed
: Boolean := False;
1986 Parent_Instance
: Entity_Id
;
1987 Renaming_In_Par
: Entity_Id
;
1988 No_Associations
: Boolean := False;
1990 function Build_Local_Package
return Node_Id
;
1991 -- The formal package is rewritten so that its parameters are replaced
1992 -- with corresponding declarations. For parameters with bona fide
1993 -- associations these declarations are created by Analyze_Associations
1994 -- as for a regular instantiation. For boxed parameters, we preserve
1995 -- the formal declarations and analyze them, in order to introduce
1996 -- entities of the right kind in the environment of the formal.
1998 -------------------------
1999 -- Build_Local_Package --
2000 -------------------------
2002 function Build_Local_Package
return Node_Id
is
2004 Pack_Decl
: Node_Id
;
2007 -- Within the formal, the name of the generic package is a renaming
2008 -- of the formal (as for a regular instantiation).
2011 Make_Package_Declaration
(Loc
,
2014 (Specification
(Original_Node
(Gen_Decl
)),
2015 Empty
, Instantiating
=> True));
2017 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
2018 Defining_Unit_Name
=>
2019 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2020 Name
=> New_Occurrence_Of
(Formal
, Loc
));
2022 if Nkind
(Gen_Id
) = N_Identifier
2023 and then Chars
(Gen_Id
) = Chars
(Pack_Id
)
2026 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2029 -- If the formal is declared with a box, or with an others choice,
2030 -- create corresponding declarations for all entities in the formal
2031 -- part, so that names with the proper types are available in the
2032 -- specification of the formal package.
2034 -- On the other hand, if there are no associations, then all the
2035 -- formals must have defaults, and this will be checked by the
2036 -- call to Analyze_Associations.
2039 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2042 Formal_Decl
: Node_Id
;
2045 -- TBA : for a formal package, need to recurse ???
2050 (Generic_Formal_Declarations
(Original_Node
(Gen_Decl
)));
2051 while Present
(Formal_Decl
) loop
2053 (Decls
, Copy_Generic_Node
(Formal_Decl
, Empty
, True));
2058 -- If generic associations are present, use Analyze_Associations to
2059 -- create the proper renaming declarations.
2063 Act_Tree
: constant Node_Id
:=
2065 (Original_Node
(Gen_Decl
), Empty
,
2066 Instantiating
=> True);
2069 Generic_Renamings
.Set_Last
(0);
2070 Generic_Renamings_HTable
.Reset
;
2071 Instantiation_Node
:= N
;
2074 Analyze_Associations
2076 Generic_Formal_Declarations
(Act_Tree
),
2077 Generic_Formal_Declarations
(Gen_Decl
));
2081 Append
(Renaming
, To
=> Decls
);
2083 -- Add generated declarations ahead of local declarations in
2086 if No
(Visible_Declarations
(Specification
(Pack_Decl
))) then
2087 Set_Visible_Declarations
(Specification
(Pack_Decl
), Decls
);
2090 (First
(Visible_Declarations
(Specification
(Pack_Decl
))),
2095 end Build_Local_Package
;
2097 -- Start of processing for Analyze_Formal_Package
2100 Text_IO_Kludge
(Gen_Id
);
2103 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2104 Gen_Unit
:= Entity
(Gen_Id
);
2106 -- Check for a formal package that is a package renaming
2108 if Present
(Renamed_Object
(Gen_Unit
)) then
2110 -- Indicate that unit is used, before replacing it with renamed
2111 -- entity for use below.
2113 if In_Extended_Main_Source_Unit
(N
) then
2114 Set_Is_Instantiated
(Gen_Unit
);
2115 Generate_Reference
(Gen_Unit
, N
);
2118 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2121 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
2122 Error_Msg_N
("expect generic package name", Gen_Id
);
2126 elsif Gen_Unit
= Current_Scope
then
2128 ("generic package cannot be used as a formal package of itself",
2133 elsif In_Open_Scopes
(Gen_Unit
) then
2134 if Is_Compilation_Unit
(Gen_Unit
)
2135 and then Is_Child_Unit
(Current_Scope
)
2137 -- Special-case the error when the formal is a parent, and
2138 -- continue analysis to minimize cascaded errors.
2141 ("generic parent cannot be used as formal package "
2142 & "of a child unit",
2147 ("generic package cannot be used as a formal package "
2156 or else No
(Generic_Associations
(N
))
2157 or else Nkind
(First
(Generic_Associations
(N
))) = N_Others_Choice
2159 No_Associations
:= True;
2162 -- If there are no generic associations, the generic parameters appear
2163 -- as local entities and are instantiated like them. We copy the generic
2164 -- package declaration as if it were an instantiation, and analyze it
2165 -- like a regular package, except that we treat the formals as
2166 -- additional visible components.
2168 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2170 if In_Extended_Main_Source_Unit
(N
) then
2171 Set_Is_Instantiated
(Gen_Unit
);
2172 Generate_Reference
(Gen_Unit
, N
);
2175 Formal
:= New_Copy
(Pack_Id
);
2176 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2179 -- Make local generic without formals. The formals will be replaced
2180 -- with internal declarations.
2182 New_N
:= Build_Local_Package
;
2184 -- If there are errors in the parameter list, Analyze_Associations
2185 -- raises Instantiation_Error. Patch the declaration to prevent
2186 -- further exception propagation.
2189 when Instantiation_Error
=>
2191 Enter_Name
(Formal
);
2192 Set_Ekind
(Formal
, E_Variable
);
2193 Set_Etype
(Formal
, Any_Type
);
2195 if Parent_Installed
then
2203 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
2204 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
2205 Set_Instance_Env
(Gen_Unit
, Formal
);
2206 Set_Is_Generic_Instance
(Formal
);
2208 Enter_Name
(Formal
);
2209 Set_Ekind
(Formal
, E_Package
);
2210 Set_Etype
(Formal
, Standard_Void_Type
);
2211 Set_Inner_Instances
(Formal
, New_Elmt_List
);
2212 Push_Scope
(Formal
);
2214 if Is_Child_Unit
(Gen_Unit
)
2215 and then Parent_Installed
2217 -- Similarly, we have to make the name of the formal visible in the
2218 -- parent instance, to resolve properly fully qualified names that
2219 -- may appear in the generic unit. The parent instance has been
2220 -- placed on the scope stack ahead of the current scope.
2222 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
2225 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
2226 Set_Ekind
(Renaming_In_Par
, E_Package
);
2227 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
2228 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
2229 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
2230 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
2231 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
2234 Analyze
(Specification
(N
));
2236 -- The formals for which associations are provided are not visible
2237 -- outside of the formal package. The others are still declared by a
2238 -- formal parameter declaration.
2240 if not No_Associations
then
2245 E
:= First_Entity
(Formal
);
2246 while Present
(E
) loop
2247 exit when Ekind
(E
) = E_Package
2248 and then Renamed_Entity
(E
) = Formal
;
2250 if not Is_Generic_Formal
(E
) then
2259 End_Package_Scope
(Formal
);
2261 if Parent_Installed
then
2267 -- Inside the generic unit, the formal package is a regular package, but
2268 -- no body is needed for it. Note that after instantiation, the defining
2269 -- unit name we need is in the new tree and not in the original (see
2270 -- Package_Instantiation). A generic formal package is an instance, and
2271 -- can be used as an actual for an inner instance.
2273 Set_Has_Completion
(Formal
, True);
2275 -- Add semantic information to the original defining identifier.
2278 Set_Ekind
(Pack_Id
, E_Package
);
2279 Set_Etype
(Pack_Id
, Standard_Void_Type
);
2280 Set_Scope
(Pack_Id
, Scope
(Formal
));
2281 Set_Has_Completion
(Pack_Id
, True);
2284 Analyze_Aspect_Specifications
(N
, Pack_Id
, Aspect_Specifications
(N
));
2285 end Analyze_Formal_Package_Declaration
;
2287 ---------------------------------
2288 -- Analyze_Formal_Private_Type --
2289 ---------------------------------
2291 procedure Analyze_Formal_Private_Type
2297 New_Private_Type
(N
, T
, Def
);
2299 -- Set the size to an arbitrary but legal value
2301 Set_Size_Info
(T
, Standard_Integer
);
2302 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2303 end Analyze_Formal_Private_Type
;
2305 ----------------------------------------
2306 -- Analyze_Formal_Signed_Integer_Type --
2307 ----------------------------------------
2309 procedure Analyze_Formal_Signed_Integer_Type
2313 Base
: constant Entity_Id
:=
2315 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
2320 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
2321 Set_Etype
(T
, Base
);
2322 Set_Size_Info
(T
, Standard_Integer
);
2323 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
2324 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
2325 Set_Is_Constrained
(T
);
2327 Set_Is_Generic_Type
(Base
);
2328 Set_Size_Info
(Base
, Standard_Integer
);
2329 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
2330 Set_Etype
(Base
, Base
);
2331 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
2332 Set_Parent
(Base
, Parent
(Def
));
2333 end Analyze_Formal_Signed_Integer_Type
;
2335 -------------------------------------------
2336 -- Analyze_Formal_Subprogram_Declaration --
2337 -------------------------------------------
2339 procedure Analyze_Formal_Subprogram_Declaration
(N
: Node_Id
) is
2340 Spec
: constant Node_Id
:= Specification
(N
);
2341 Def
: constant Node_Id
:= Default_Name
(N
);
2342 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2350 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
2351 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
2355 Analyze_Subprogram_Declaration
(N
);
2356 Set_Is_Formal_Subprogram
(Nam
);
2357 Set_Has_Completion
(Nam
);
2359 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
2360 Set_Is_Abstract_Subprogram
(Nam
);
2361 Set_Is_Dispatching_Operation
(Nam
);
2364 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
2366 if No
(Ctrl_Type
) then
2368 ("abstract formal subprogram must have a controlling type",
2371 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
2376 -- Default name is resolved at the point of instantiation
2378 if Box_Present
(N
) then
2381 -- Else default is bound at the point of generic declaration
2383 elsif Present
(Def
) then
2384 if Nkind
(Def
) = N_Operator_Symbol
then
2385 Find_Direct_Name
(Def
);
2387 elsif Nkind
(Def
) /= N_Attribute_Reference
then
2391 -- For an attribute reference, analyze the prefix and verify
2392 -- that it has the proper profile for the subprogram.
2394 Analyze
(Prefix
(Def
));
2395 Valid_Default_Attribute
(Nam
, Def
);
2399 -- Default name may be overloaded, in which case the interpretation
2400 -- with the correct profile must be selected, as for a renaming.
2401 -- If the definition is an indexed component, it must denote a
2402 -- member of an entry family. If it is a selected component, it
2403 -- can be a protected operation.
2405 if Etype
(Def
) = Any_Type
then
2408 elsif Nkind
(Def
) = N_Selected_Component
then
2409 if not Is_Overloadable
(Entity
(Selector_Name
(Def
))) then
2410 Error_Msg_N
("expect valid subprogram name as default", Def
);
2413 elsif Nkind
(Def
) = N_Indexed_Component
then
2414 if Is_Entity_Name
(Prefix
(Def
)) then
2415 if Ekind
(Entity
(Prefix
(Def
))) /= E_Entry_Family
then
2416 Error_Msg_N
("expect valid subprogram name as default", Def
);
2419 elsif Nkind
(Prefix
(Def
)) = N_Selected_Component
then
2420 if Ekind
(Entity
(Selector_Name
(Prefix
(Def
)))) /=
2423 Error_Msg_N
("expect valid subprogram name as default", Def
);
2427 Error_Msg_N
("expect valid subprogram name as default", Def
);
2431 elsif Nkind
(Def
) = N_Character_Literal
then
2433 -- Needs some type checks: subprogram should be parameterless???
2435 Resolve
(Def
, (Etype
(Nam
)));
2437 elsif not Is_Entity_Name
(Def
)
2438 or else not Is_Overloadable
(Entity
(Def
))
2440 Error_Msg_N
("expect valid subprogram name as default", Def
);
2443 elsif not Is_Overloaded
(Def
) then
2444 Subp
:= Entity
(Def
);
2447 Error_Msg_N
("premature usage of formal subprogram", Def
);
2449 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
2450 Error_Msg_N
("no visible entity matches specification", Def
);
2453 -- More than one interpretation, so disambiguate as for a renaming
2458 I1
: Interp_Index
:= 0;
2464 Get_First_Interp
(Def
, I
, It
);
2465 while Present
(It
.Nam
) loop
2466 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
2467 if Subp
/= Any_Id
then
2468 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
2470 if It1
= No_Interp
then
2471 Error_Msg_N
("ambiguous default subprogram", Def
);
2484 Get_Next_Interp
(I
, It
);
2488 if Subp
/= Any_Id
then
2489 Set_Entity
(Def
, Subp
);
2492 Error_Msg_N
("premature usage of formal subprogram", Def
);
2494 elsif Ekind
(Subp
) /= E_Operator
then
2495 Check_Mode_Conformant
(Subp
, Nam
);
2499 Error_Msg_N
("no visible subprogram matches specification", N
);
2505 Analyze_Aspect_Specifications
(N
, Nam
, Aspect_Specifications
(N
));
2506 end Analyze_Formal_Subprogram_Declaration
;
2508 -------------------------------------
2509 -- Analyze_Formal_Type_Declaration --
2510 -------------------------------------
2512 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
2513 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
2517 T
:= Defining_Identifier
(N
);
2519 if Present
(Discriminant_Specifications
(N
))
2520 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2523 ("discriminants not allowed for this formal type", T
);
2526 -- Enter the new name, and branch to specific routine
2529 when N_Formal_Private_Type_Definition
=>
2530 Analyze_Formal_Private_Type
(N
, T
, Def
);
2532 when N_Formal_Derived_Type_Definition
=>
2533 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2535 when N_Formal_Discrete_Type_Definition
=>
2536 Analyze_Formal_Discrete_Type
(T
, Def
);
2538 when N_Formal_Signed_Integer_Type_Definition
=>
2539 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2541 when N_Formal_Modular_Type_Definition
=>
2542 Analyze_Formal_Modular_Type
(T
, Def
);
2544 when N_Formal_Floating_Point_Definition
=>
2545 Analyze_Formal_Floating_Type
(T
, Def
);
2547 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2548 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2550 when N_Formal_Decimal_Fixed_Point_Definition
=>
2551 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2553 when N_Array_Type_Definition
=>
2554 Analyze_Formal_Array_Type
(T
, Def
);
2556 when N_Access_To_Object_Definition |
2557 N_Access_Function_Definition |
2558 N_Access_Procedure_Definition
=>
2559 Analyze_Generic_Access_Type
(T
, Def
);
2561 -- Ada 2005: a interface declaration is encoded as an abstract
2562 -- record declaration or a abstract type derivation.
2564 when N_Record_Definition
=>
2565 Analyze_Formal_Interface_Type
(N
, T
, Def
);
2567 when N_Derived_Type_Definition
=>
2568 Analyze_Formal_Derived_Interface_Type
(N
, T
, Def
);
2574 raise Program_Error
;
2578 Set_Is_Generic_Type
(T
);
2579 Analyze_Aspect_Specifications
(N
, T
, Aspect_Specifications
(N
));
2580 end Analyze_Formal_Type_Declaration
;
2582 ------------------------------------
2583 -- Analyze_Function_Instantiation --
2584 ------------------------------------
2586 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2588 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2589 end Analyze_Function_Instantiation
;
2591 ---------------------------------
2592 -- Analyze_Generic_Access_Type --
2593 ---------------------------------
2595 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2599 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2600 Access_Type_Declaration
(T
, Def
);
2602 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2603 and then No
(Full_View
(Designated_Type
(T
)))
2604 and then not Is_Generic_Type
(Designated_Type
(T
))
2606 Error_Msg_N
("premature usage of incomplete type", Def
);
2608 elsif not Is_Entity_Name
(Subtype_Indication
(Def
)) then
2610 ("only a subtype mark is allowed in a formal", Def
);
2614 Access_Subprogram_Declaration
(T
, Def
);
2616 end Analyze_Generic_Access_Type
;
2618 ---------------------------------
2619 -- Analyze_Generic_Formal_Part --
2620 ---------------------------------
2622 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2623 Gen_Parm_Decl
: Node_Id
;
2626 -- The generic formals are processed in the scope of the generic unit,
2627 -- where they are immediately visible. The scope is installed by the
2630 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2632 while Present
(Gen_Parm_Decl
) loop
2633 Analyze
(Gen_Parm_Decl
);
2634 Next
(Gen_Parm_Decl
);
2637 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2638 end Analyze_Generic_Formal_Part
;
2640 ------------------------------------------
2641 -- Analyze_Generic_Package_Declaration --
2642 ------------------------------------------
2644 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2645 Loc
: constant Source_Ptr
:= Sloc
(N
);
2648 Save_Parent
: Node_Id
;
2650 Decls
: constant List_Id
:=
2651 Visible_Declarations
(Specification
(N
));
2655 -- We introduce a renaming of the enclosing package, to have a usable
2656 -- entity as the prefix of an expanded name for a local entity of the
2657 -- form Par.P.Q, where P is the generic package. This is because a local
2658 -- entity named P may hide it, so that the usual visibility rules in
2659 -- the instance will not resolve properly.
2662 Make_Package_Renaming_Declaration
(Loc
,
2663 Defining_Unit_Name
=>
2664 Make_Defining_Identifier
(Loc
,
2665 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2666 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2668 if Present
(Decls
) then
2669 Decl
:= First
(Decls
);
2670 while Present
(Decl
)
2671 and then Nkind
(Decl
) = N_Pragma
2676 if Present
(Decl
) then
2677 Insert_Before
(Decl
, Renaming
);
2679 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2683 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2686 -- Create copy of generic unit, and save for instantiation. If the unit
2687 -- is a child unit, do not copy the specifications for the parent, which
2688 -- are not part of the generic tree.
2690 Save_Parent
:= Parent_Spec
(N
);
2691 Set_Parent_Spec
(N
, Empty
);
2693 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2694 Set_Parent_Spec
(New_N
, Save_Parent
);
2696 Id
:= Defining_Entity
(N
);
2697 Generate_Definition
(Id
);
2699 -- Expansion is not applied to generic units
2704 Set_Ekind
(Id
, E_Generic_Package
);
2705 Set_Etype
(Id
, Standard_Void_Type
);
2707 Enter_Generic_Scope
(Id
);
2708 Set_Inner_Instances
(Id
, New_Elmt_List
);
2710 Set_Categorization_From_Pragmas
(N
);
2711 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2713 -- Link the declaration of the generic homonym in the generic copy to
2714 -- the package it renames, so that it is always resolved properly.
2716 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2717 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2719 -- For a library unit, we have reconstructed the entity for the unit,
2720 -- and must reset it in the library tables.
2722 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2723 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2726 Analyze_Generic_Formal_Part
(N
);
2728 -- After processing the generic formals, analysis proceeds as for a
2729 -- non-generic package.
2731 Analyze
(Specification
(N
));
2733 Validate_Categorization_Dependency
(N
, Id
);
2737 End_Package_Scope
(Id
);
2738 Exit_Generic_Scope
(Id
);
2740 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2741 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2742 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2743 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2746 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2747 Validate_RT_RAT_Component
(N
);
2749 -- If this is a spec without a body, check that generic parameters
2752 if not Body_Required
(Parent
(N
)) then
2753 Check_References
(Id
);
2757 Analyze_Aspect_Specifications
(N
, Id
, Aspect_Specifications
(N
));
2758 end Analyze_Generic_Package_Declaration
;
2760 --------------------------------------------
2761 -- Analyze_Generic_Subprogram_Declaration --
2762 --------------------------------------------
2764 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2769 Result_Type
: Entity_Id
;
2770 Save_Parent
: Node_Id
;
2774 -- Create copy of generic unit, and save for instantiation. If the unit
2775 -- is a child unit, do not copy the specifications for the parent, which
2776 -- are not part of the generic tree.
2778 Save_Parent
:= Parent_Spec
(N
);
2779 Set_Parent_Spec
(N
, Empty
);
2781 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2782 Set_Parent_Spec
(New_N
, Save_Parent
);
2785 Spec
:= Specification
(N
);
2786 Id
:= Defining_Entity
(Spec
);
2787 Generate_Definition
(Id
);
2789 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2791 ("operator symbol not allowed for generic subprogram", Id
);
2798 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2800 Enter_Generic_Scope
(Id
);
2801 Set_Inner_Instances
(Id
, New_Elmt_List
);
2802 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2804 Analyze_Generic_Formal_Part
(N
);
2806 Formals
:= Parameter_Specifications
(Spec
);
2808 if Present
(Formals
) then
2809 Process_Formals
(Formals
, Spec
);
2812 if Nkind
(Spec
) = N_Function_Specification
then
2813 Set_Ekind
(Id
, E_Generic_Function
);
2815 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
2816 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
2817 Set_Etype
(Id
, Result_Type
);
2819 -- Check restriction imposed by AI05-073: a generic function
2820 -- cannot return an abstract type or an access to such.
2822 -- This is a binding interpreration should it apply to earlier
2823 -- versions of Ada as well as Ada 2012???
2825 if Is_Abstract_Type
(Designated_Type
(Result_Type
))
2826 and then Ada_Version
>= Ada_2012
2828 Error_Msg_N
("generic function cannot have an access result"
2829 & " that designates an abstract type", Spec
);
2833 Find_Type
(Result_Definition
(Spec
));
2834 Typ
:= Entity
(Result_Definition
(Spec
));
2836 if Is_Abstract_Type
(Typ
)
2837 and then Ada_Version
>= Ada_2012
2840 ("generic function cannot have abstract result type", Spec
);
2843 -- If a null exclusion is imposed on the result type, then create
2844 -- a null-excluding itype (an access subtype) and use it as the
2845 -- function's Etype.
2847 if Is_Access_Type
(Typ
)
2848 and then Null_Exclusion_Present
(Spec
)
2851 Create_Null_Excluding_Itype
2853 Related_Nod
=> Spec
,
2854 Scope_Id
=> Defining_Unit_Name
(Spec
)));
2856 Set_Etype
(Id
, Typ
);
2861 Set_Ekind
(Id
, E_Generic_Procedure
);
2862 Set_Etype
(Id
, Standard_Void_Type
);
2865 -- For a library unit, we have reconstructed the entity for the unit,
2866 -- and must reset it in the library tables. We also make sure that
2867 -- Body_Required is set properly in the original compilation unit node.
2869 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2870 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2871 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2874 Set_Categorization_From_Pragmas
(N
);
2875 Validate_Categorization_Dependency
(N
, Id
);
2877 Save_Global_References
(Original_Node
(N
));
2881 Exit_Generic_Scope
(Id
);
2882 Generate_Reference_To_Formals
(Id
);
2884 List_Inherited_Pre_Post_Aspects
(Id
);
2885 Analyze_Aspect_Specifications
(N
, Id
, Aspect_Specifications
(N
));
2886 end Analyze_Generic_Subprogram_Declaration
;
2888 -----------------------------------
2889 -- Analyze_Package_Instantiation --
2890 -----------------------------------
2892 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2893 Loc
: constant Source_Ptr
:= Sloc
(N
);
2894 Gen_Id
: constant Node_Id
:= Name
(N
);
2897 Act_Decl_Name
: Node_Id
;
2898 Act_Decl_Id
: Entity_Id
;
2903 Gen_Unit
: Entity_Id
;
2905 Is_Actual_Pack
: constant Boolean :=
2906 Is_Internal
(Defining_Entity
(N
));
2908 Env_Installed
: Boolean := False;
2909 Parent_Installed
: Boolean := False;
2910 Renaming_List
: List_Id
;
2911 Unit_Renaming
: Node_Id
;
2912 Needs_Body
: Boolean;
2913 Inline_Now
: Boolean := False;
2915 procedure Delay_Descriptors
(E
: Entity_Id
);
2916 -- Delay generation of subprogram descriptors for given entity
2918 function Might_Inline_Subp
return Boolean;
2919 -- If inlining is active and the generic contains inlined subprograms,
2920 -- we instantiate the body. This may cause superfluous instantiations,
2921 -- but it is simpler than detecting the need for the body at the point
2922 -- of inlining, when the context of the instance is not available.
2924 -----------------------
2925 -- Delay_Descriptors --
2926 -----------------------
2928 procedure Delay_Descriptors
(E
: Entity_Id
) is
2930 if not Delay_Subprogram_Descriptors
(E
) then
2931 Set_Delay_Subprogram_Descriptors
(E
);
2932 Pending_Descriptor
.Append
(E
);
2934 end Delay_Descriptors
;
2936 -----------------------
2937 -- Might_Inline_Subp --
2938 -----------------------
2940 function Might_Inline_Subp
return Boolean is
2944 if not Inline_Processing_Required
then
2948 E
:= First_Entity
(Gen_Unit
);
2949 while Present
(E
) loop
2950 if Is_Subprogram
(E
)
2951 and then Is_Inlined
(E
)
2961 end Might_Inline_Subp
;
2963 -- Start of processing for Analyze_Package_Instantiation
2966 -- Very first thing: apply the special kludge for Text_IO processing
2967 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2969 Text_IO_Kludge
(Name
(N
));
2971 -- Make node global for error reporting
2973 Instantiation_Node
:= N
;
2975 -- Case of instantiation of a generic package
2977 if Nkind
(N
) = N_Package_Instantiation
then
2978 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2979 Set_Comes_From_Source
(Act_Decl_Id
, True);
2981 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2983 Make_Defining_Program_Unit_Name
(Loc
,
2984 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2985 Defining_Identifier
=> Act_Decl_Id
);
2987 Act_Decl_Name
:= Act_Decl_Id
;
2990 -- Case of instantiation of a formal package
2993 Act_Decl_Id
:= Defining_Identifier
(N
);
2994 Act_Decl_Name
:= Act_Decl_Id
;
2997 Generate_Definition
(Act_Decl_Id
);
2998 Preanalyze_Actuals
(N
);
3001 Env_Installed
:= True;
3003 -- Reset renaming map for formal types. The mapping is established
3004 -- when analyzing the generic associations, but some mappings are
3005 -- inherited from formal packages of parent units, and these are
3006 -- constructed when the parents are installed.
3008 Generic_Renamings
.Set_Last
(0);
3009 Generic_Renamings_HTable
.Reset
;
3011 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3012 Gen_Unit
:= Entity
(Gen_Id
);
3014 -- Verify that it is the name of a generic package
3016 -- A visibility glitch: if the instance is a child unit and the generic
3017 -- is the generic unit of a parent instance (i.e. both the parent and
3018 -- the child units are instances of the same package) the name now
3019 -- denotes the renaming within the parent, not the intended generic
3020 -- unit. See if there is a homonym that is the desired generic. The
3021 -- renaming declaration must be visible inside the instance of the
3022 -- child, but not when analyzing the name in the instantiation itself.
3024 if Ekind
(Gen_Unit
) = E_Package
3025 and then Present
(Renamed_Entity
(Gen_Unit
))
3026 and then In_Open_Scopes
(Renamed_Entity
(Gen_Unit
))
3027 and then Is_Generic_Instance
(Renamed_Entity
(Gen_Unit
))
3028 and then Present
(Homonym
(Gen_Unit
))
3030 Gen_Unit
:= Homonym
(Gen_Unit
);
3033 if Etype
(Gen_Unit
) = Any_Type
then
3037 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
3039 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
3041 if From_With_Type
(Gen_Unit
) then
3043 ("cannot instantiate a limited withed package", Gen_Id
);
3046 ("expect name of generic package in instantiation", Gen_Id
);
3053 if In_Extended_Main_Source_Unit
(N
) then
3054 Set_Is_Instantiated
(Gen_Unit
);
3055 Generate_Reference
(Gen_Unit
, N
);
3057 if Present
(Renamed_Object
(Gen_Unit
)) then
3058 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
3059 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
3063 if Nkind
(Gen_Id
) = N_Identifier
3064 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3067 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3069 elsif Nkind
(Gen_Id
) = N_Expanded_Name
3070 and then Is_Child_Unit
(Gen_Unit
)
3071 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
3072 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
3075 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
3078 Set_Entity
(Gen_Id
, Gen_Unit
);
3080 -- If generic is a renaming, get original generic unit
3082 if Present
(Renamed_Object
(Gen_Unit
))
3083 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
3085 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3088 -- Verify that there are no circular instantiations
3090 if In_Open_Scopes
(Gen_Unit
) then
3091 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3095 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3096 Error_Msg_Node_2
:= Current_Scope
;
3098 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3099 Circularity_Detected
:= True;
3104 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3106 -- Initialize renamings map, for error checking, and the list that
3107 -- holds private entities whose views have changed between generic
3108 -- definition and instantiation. If this is the instance created to
3109 -- validate an actual package, the instantiation environment is that
3110 -- of the enclosing instance.
3112 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3114 -- Copy original generic tree, to produce text for instantiation
3118 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3120 Act_Spec
:= Specification
(Act_Tree
);
3122 -- If this is the instance created to validate an actual package,
3123 -- only the formals matter, do not examine the package spec itself.
3125 if Is_Actual_Pack
then
3126 Set_Visible_Declarations
(Act_Spec
, New_List
);
3127 Set_Private_Declarations
(Act_Spec
, New_List
);
3131 Analyze_Associations
3133 Generic_Formal_Declarations
(Act_Tree
),
3134 Generic_Formal_Declarations
(Gen_Decl
));
3136 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
3137 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
3138 Set_Is_Generic_Instance
(Act_Decl_Id
);
3140 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3142 -- References to the generic in its own declaration or its body are
3143 -- references to the instance. Add a renaming declaration for the
3144 -- generic unit itself. This declaration, as well as the renaming
3145 -- declarations for the generic formals, must remain private to the
3146 -- unit: the formals, because this is the language semantics, and
3147 -- the unit because its use is an artifact of the implementation.
3150 Make_Package_Renaming_Declaration
(Loc
,
3151 Defining_Unit_Name
=>
3152 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
3153 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
3155 Append
(Unit_Renaming
, Renaming_List
);
3157 -- The renaming declarations are the first local declarations of
3160 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
3162 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
3164 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
3168 Make_Package_Declaration
(Loc
,
3169 Specification
=> Act_Spec
);
3171 -- Save the instantiation node, for subsequent instantiation of the
3172 -- body, if there is one and we are generating code for the current
3173 -- unit. Mark the unit as having a body, to avoid a premature error
3176 -- We instantiate the body if we are generating code, if we are
3177 -- generating cross-reference information, or if we are building
3178 -- trees for ASIS use.
3181 Enclosing_Body_Present
: Boolean := False;
3182 -- If the generic unit is not a compilation unit, then a body may
3183 -- be present in its parent even if none is required. We create a
3184 -- tentative pending instantiation for the body, which will be
3185 -- discarded if none is actually present.
3190 if Scope
(Gen_Unit
) /= Standard_Standard
3191 and then not Is_Child_Unit
(Gen_Unit
)
3193 Scop
:= Scope
(Gen_Unit
);
3195 while Present
(Scop
)
3196 and then Scop
/= Standard_Standard
3198 if Unit_Requires_Body
(Scop
) then
3199 Enclosing_Body_Present
:= True;
3202 elsif In_Open_Scopes
(Scop
)
3203 and then In_Package_Body
(Scop
)
3205 Enclosing_Body_Present
:= True;
3209 exit when Is_Compilation_Unit
(Scop
);
3210 Scop
:= Scope
(Scop
);
3214 -- If front-end inlining is enabled, and this is a unit for which
3215 -- code will be generated, we instantiate the body at once.
3217 -- This is done if the instance is not the main unit, and if the
3218 -- generic is not a child unit of another generic, to avoid scope
3219 -- problems and the reinstallation of parent instances.
3222 and then (not Is_Child_Unit
(Gen_Unit
)
3223 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
3224 and then Might_Inline_Subp
3225 and then not Is_Actual_Pack
3227 if Front_End_Inlining
3228 and then (Is_In_Main_Unit
(N
)
3229 or else In_Main_Context
(Current_Scope
))
3230 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3234 -- In configurable_run_time mode we force the inlining of
3235 -- predefined subprograms marked Inline_Always, to minimize
3236 -- the use of the run-time library.
3238 elsif Is_Predefined_File_Name
3239 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
3240 and then Configurable_Run_Time_Mode
3241 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
3246 -- If the current scope is itself an instance within a child
3247 -- unit, there will be duplications in the scope stack, and the
3248 -- unstacking mechanism in Inline_Instance_Body will fail.
3249 -- This loses some rare cases of optimization, and might be
3250 -- improved some day, if we can find a proper abstraction for
3251 -- "the complete compilation context" that can be saved and
3254 if Is_Generic_Instance
(Current_Scope
) then
3256 Curr_Unit
: constant Entity_Id
:=
3257 Cunit_Entity
(Current_Sem_Unit
);
3259 if Curr_Unit
/= Current_Scope
3260 and then Is_Child_Unit
(Curr_Unit
)
3262 Inline_Now
:= False;
3269 (Unit_Requires_Body
(Gen_Unit
)
3270 or else Enclosing_Body_Present
3271 or else Present
(Corresponding_Body
(Gen_Decl
)))
3272 and then (Is_In_Main_Unit
(N
)
3273 or else Might_Inline_Subp
)
3274 and then not Is_Actual_Pack
3275 and then not Inline_Now
3276 and then (Operating_Mode
= Generate_Code
3277 or else (Operating_Mode
= Check_Semantics
3278 and then ASIS_Mode
));
3280 -- If front_end_inlining is enabled, do not instantiate body if
3281 -- within a generic context.
3283 if (Front_End_Inlining
3284 and then not Expander_Active
)
3285 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
3287 Needs_Body
:= False;
3290 -- If the current context is generic, and the package being
3291 -- instantiated is declared within a formal package, there is no
3292 -- body to instantiate until the enclosing generic is instantiated
3293 -- and there is an actual for the formal package. If the formal
3294 -- package has parameters, we build a regular package instance for
3295 -- it, that precedes the original formal package declaration.
3297 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
3299 Decl
: constant Node_Id
:=
3301 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
3303 if Nkind
(Decl
) = N_Formal_Package_Declaration
3304 or else (Nkind
(Decl
) = N_Package_Declaration
3305 and then Is_List_Member
(Decl
)
3306 and then Present
(Next
(Decl
))
3308 Nkind
(Next
(Decl
)) =
3309 N_Formal_Package_Declaration
)
3311 Needs_Body
:= False;
3317 -- If we are generating calling stubs, we never need a body for an
3318 -- instantiation from source. However normal processing occurs for
3319 -- any generic instantiation appearing in generated code, since we
3320 -- do not generate stubs in that case.
3322 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
3323 and then Comes_From_Source
(N
)
3325 Needs_Body
:= False;
3330 -- Here is a defence against a ludicrous number of instantiations
3331 -- caused by a circular set of instantiation attempts.
3333 if Pending_Instantiations
.Last
>
3334 Hostparm
.Max_Instantiations
3336 Error_Msg_N
("too many instantiations", N
);
3337 raise Unrecoverable_Error
;
3340 -- Indicate that the enclosing scopes contain an instantiation,
3341 -- and that cleanup actions should be delayed until after the
3342 -- instance body is expanded.
3344 Check_Forward_Instantiation
(Gen_Decl
);
3345 if Nkind
(N
) = N_Package_Instantiation
then
3347 Enclosing_Master
: Entity_Id
;
3350 -- Loop to search enclosing masters
3352 Enclosing_Master
:= Current_Scope
;
3353 Scope_Loop
: while Enclosing_Master
/= Standard_Standard
loop
3354 if Ekind
(Enclosing_Master
) = E_Package
then
3355 if Is_Compilation_Unit
(Enclosing_Master
) then
3356 if In_Package_Body
(Enclosing_Master
) then
3358 (Body_Entity
(Enclosing_Master
));
3367 Enclosing_Master
:= Scope
(Enclosing_Master
);
3370 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
3371 Enclosing_Master
:= Scope
(Enclosing_Master
);
3373 elsif Is_Generic_Subprogram
(Enclosing_Master
)
3374 or else Ekind
(Enclosing_Master
) = E_Void
3376 -- Cleanup actions will eventually be performed on the
3377 -- enclosing instance, if any. Enclosing scope is void
3378 -- in the formal part of a generic subprogram.
3383 if Ekind
(Enclosing_Master
) = E_Entry
3385 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
3387 if not Expander_Active
then
3391 Protected_Body_Subprogram
(Enclosing_Master
);
3395 Set_Delay_Cleanups
(Enclosing_Master
);
3397 while Ekind
(Enclosing_Master
) = E_Block
loop
3398 Enclosing_Master
:= Scope
(Enclosing_Master
);
3401 if Is_Subprogram
(Enclosing_Master
) then
3402 Delay_Descriptors
(Enclosing_Master
);
3404 elsif Is_Task_Type
(Enclosing_Master
) then
3406 TBP
: constant Node_Id
:=
3407 Get_Task_Body_Procedure
3410 if Present
(TBP
) then
3411 Delay_Descriptors
(TBP
);
3412 Set_Delay_Cleanups
(TBP
);
3419 end loop Scope_Loop
;
3422 -- Make entry in table
3424 Pending_Instantiations
.Append
3426 Act_Decl
=> Act_Decl
,
3427 Expander_Status
=> Expander_Active
,
3428 Current_Sem_Unit
=> Current_Sem_Unit
,
3429 Scope_Suppress
=> Scope_Suppress
,
3430 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
3431 Version
=> Ada_Version
));
3435 Set_Categorization_From_Pragmas
(Act_Decl
);
3437 if Parent_Installed
then
3441 Set_Instance_Spec
(N
, Act_Decl
);
3443 -- If not a compilation unit, insert the package declaration before
3444 -- the original instantiation node.
3446 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3447 Mark_Rewrite_Insertion
(Act_Decl
);
3448 Insert_Before
(N
, Act_Decl
);
3451 -- For an instantiation that is a compilation unit, place declaration
3452 -- on current node so context is complete for analysis (including
3453 -- nested instantiations). If this is the main unit, the declaration
3454 -- eventually replaces the instantiation node. If the instance body
3455 -- is created later, it replaces the instance node, and the
3456 -- declaration is attached to it (see
3457 -- Build_Instance_Compilation_Unit_Nodes).
3460 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
3462 -- The entity for the current unit is the newly created one,
3463 -- and all semantic information is attached to it.
3465 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
3467 -- If this is the main unit, replace the main entity as well
3469 if Current_Sem_Unit
= Main_Unit
then
3470 Main_Unit_Entity
:= Act_Decl_Id
;
3474 Set_Unit
(Parent
(N
), Act_Decl
);
3475 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3476 Set_Package_Instantiation
(Act_Decl_Id
, N
);
3478 Set_Unit
(Parent
(N
), N
);
3479 Set_Body_Required
(Parent
(N
), False);
3481 -- We never need elaboration checks on instantiations, since by
3482 -- definition, the body instantiation is elaborated at the same
3483 -- time as the spec instantiation.
3485 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3486 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3489 Check_Elab_Instantiation
(N
);
3491 if ABE_Is_Certain
(N
) and then Needs_Body
then
3492 Pending_Instantiations
.Decrement_Last
;
3495 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3497 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
3498 First_Private_Entity
(Act_Decl_Id
));
3500 -- If the instantiation will receive a body, the unit will be
3501 -- transformed into a package body, and receive its own elaboration
3502 -- entity. Otherwise, the nature of the unit is now a package
3505 if Nkind
(Parent
(N
)) = N_Compilation_Unit
3506 and then not Needs_Body
3508 Rewrite
(N
, Act_Decl
);
3511 if Present
(Corresponding_Body
(Gen_Decl
))
3512 or else Unit_Requires_Body
(Gen_Unit
)
3514 Set_Has_Completion
(Act_Decl_Id
);
3517 Check_Formal_Packages
(Act_Decl_Id
);
3519 Restore_Private_Views
(Act_Decl_Id
);
3521 Inherit_Context
(Gen_Decl
, N
);
3523 if Parent_Installed
then
3528 Env_Installed
:= False;
3531 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3533 -- There used to be a check here to prevent instantiations in local
3534 -- contexts if the No_Local_Allocators restriction was active. This
3535 -- check was removed by a binding interpretation in AI-95-00130/07,
3536 -- but we retain the code for documentation purposes.
3538 -- if Ekind (Act_Decl_Id) /= E_Void
3539 -- and then not Is_Library_Level_Entity (Act_Decl_Id)
3541 -- Check_Restriction (No_Local_Allocators, N);
3545 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
3548 -- The following is a tree patch for ASIS: ASIS needs separate nodes to
3549 -- be used as defining identifiers for a formal package and for the
3550 -- corresponding expanded package.
3552 if Nkind
(N
) = N_Formal_Package_Declaration
then
3553 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
3554 Set_Comes_From_Source
(Act_Decl_Id
, True);
3555 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
3556 Set_Defining_Identifier
(N
, Act_Decl_Id
);
3560 Analyze_Aspect_Specifications
3561 (N
, Act_Decl_Id
, Aspect_Specifications
(N
));
3564 when Instantiation_Error
=>
3565 if Parent_Installed
then
3569 if Env_Installed
then
3572 end Analyze_Package_Instantiation
;
3574 --------------------------
3575 -- Inline_Instance_Body --
3576 --------------------------
3578 procedure Inline_Instance_Body
3580 Gen_Unit
: Entity_Id
;
3584 Gen_Comp
: constant Entity_Id
:=
3585 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
3586 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
3587 Curr_Scope
: Entity_Id
:= Empty
;
3588 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
3589 Removed
: Boolean := False;
3590 Num_Scopes
: Int
:= 0;
3592 Scope_Stack_Depth
: constant Int
:=
3593 Scope_Stack
.Last
- Scope_Stack
.First
+ 1;
3595 Use_Clauses
: array (1 .. Scope_Stack_Depth
) of Node_Id
;
3596 Instances
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3597 Inner_Scopes
: array (1 .. Scope_Stack_Depth
) of Entity_Id
;
3598 Num_Inner
: Int
:= 0;
3599 N_Instances
: Int
:= 0;
3603 -- Case of generic unit defined in another unit. We must remove the
3604 -- complete context of the current unit to install that of the generic.
3606 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
3608 -- Add some comments for the following two loops ???
3611 while Present
(S
) and then S
/= Standard_Standard
loop
3613 Num_Scopes
:= Num_Scopes
+ 1;
3615 Use_Clauses
(Num_Scopes
) :=
3617 (Scope_Stack
.Last
- Num_Scopes
+ 1).
3619 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
3621 exit when Scope_Stack
.Last
- Num_Scopes
+ 1 = Scope_Stack
.First
3622 or else Scope_Stack
.Table
3623 (Scope_Stack
.Last
- Num_Scopes
).Entity
3627 exit when Is_Generic_Instance
(S
)
3628 and then (In_Package_Body
(S
)
3629 or else Ekind
(S
) = E_Procedure
3630 or else Ekind
(S
) = E_Function
);
3634 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
3636 -- Find and save all enclosing instances
3641 and then S
/= Standard_Standard
3643 if Is_Generic_Instance
(S
) then
3644 N_Instances
:= N_Instances
+ 1;
3645 Instances
(N_Instances
) := S
;
3647 exit when In_Package_Body
(S
);
3653 -- Remove context of current compilation unit, unless we are within a
3654 -- nested package instantiation, in which case the context has been
3655 -- removed previously.
3657 -- If current scope is the body of a child unit, remove context of
3658 -- spec as well. If an enclosing scope is an instance body, the
3659 -- context has already been removed, but the entities in the body
3660 -- must be made invisible as well.
3665 and then S
/= Standard_Standard
3667 if Is_Generic_Instance
(S
)
3668 and then (In_Package_Body
(S
)
3669 or else Ekind
(S
) = E_Procedure
3670 or else Ekind
(S
) = E_Function
)
3672 -- We still have to remove the entities of the enclosing
3673 -- instance from direct visibility.
3678 E
:= First_Entity
(S
);
3679 while Present
(E
) loop
3680 Set_Is_Immediately_Visible
(E
, False);
3689 or else (Ekind
(Curr_Unit
) = E_Package_Body
3690 and then S
= Spec_Entity
(Curr_Unit
))
3691 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3694 (Unit_Declaration_Node
(Curr_Unit
)))
3698 -- Remove entities in current scopes from visibility, so that
3699 -- instance body is compiled in a clean environment.
3701 Save_Scope_Stack
(Handle_Use
=> False);
3703 if Is_Child_Unit
(S
) then
3705 -- Remove child unit from stack, as well as inner scopes.
3706 -- Removing the context of a child unit removes parent units
3709 while Current_Scope
/= S
loop
3710 Num_Inner
:= Num_Inner
+ 1;
3711 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3716 Remove_Context
(Curr_Comp
);
3720 Remove_Context
(Curr_Comp
);
3723 if Ekind
(Curr_Unit
) = E_Package_Body
then
3724 Remove_Context
(Library_Unit
(Curr_Comp
));
3730 pragma Assert
(Num_Inner
< Num_Scopes
);
3732 Push_Scope
(Standard_Standard
);
3733 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3734 Instantiate_Package_Body
3737 Act_Decl
=> Act_Decl
,
3738 Expander_Status
=> Expander_Active
,
3739 Current_Sem_Unit
=> Current_Sem_Unit
,
3740 Scope_Suppress
=> Scope_Suppress
,
3741 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
3742 Version
=> Ada_Version
)),
3743 Inlined_Body
=> True);
3749 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3751 -- Reset Generic_Instance flag so that use clauses can be installed
3752 -- in the proper order. (See Use_One_Package for effect of enclosing
3753 -- instances on processing of use clauses).
3755 for J
in 1 .. N_Instances
loop
3756 Set_Is_Generic_Instance
(Instances
(J
), False);
3760 Install_Context
(Curr_Comp
);
3762 if Present
(Curr_Scope
)
3763 and then Is_Child_Unit
(Curr_Scope
)
3765 Push_Scope
(Curr_Scope
);
3766 Set_Is_Immediately_Visible
(Curr_Scope
);
3768 -- Finally, restore inner scopes as well
3770 for J
in reverse 1 .. Num_Inner
loop
3771 Push_Scope
(Inner_Scopes
(J
));
3775 Restore_Scope_Stack
(Handle_Use
=> False);
3777 if Present
(Curr_Scope
)
3779 (In_Private_Part
(Curr_Scope
)
3780 or else In_Package_Body
(Curr_Scope
))
3782 -- Install private declaration of ancestor units, which are
3783 -- currently available. Restore_Scope_Stack and Install_Context
3784 -- only install the visible part of parents.
3789 Par
:= Scope
(Curr_Scope
);
3790 while (Present
(Par
))
3791 and then Par
/= Standard_Standard
3793 Install_Private_Declarations
(Par
);
3800 -- Restore use clauses. For a child unit, use clauses in the parents
3801 -- are restored when installing the context, so only those in inner
3802 -- scopes (and those local to the child unit itself) need to be
3803 -- installed explicitly.
3805 if Is_Child_Unit
(Curr_Unit
)
3808 for J
in reverse 1 .. Num_Inner
+ 1 loop
3809 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3811 Install_Use_Clauses
(Use_Clauses
(J
));
3815 for J
in reverse 1 .. Num_Scopes
loop
3816 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3818 Install_Use_Clauses
(Use_Clauses
(J
));
3822 -- Restore status of instances. If one of them is a body, make
3823 -- its local entities visible again.
3830 for J
in 1 .. N_Instances
loop
3831 Inst
:= Instances
(J
);
3832 Set_Is_Generic_Instance
(Inst
, True);
3834 if In_Package_Body
(Inst
)
3835 or else Ekind
(S
) = E_Procedure
3836 or else Ekind
(S
) = E_Function
3838 E
:= First_Entity
(Instances
(J
));
3839 while Present
(E
) loop
3840 Set_Is_Immediately_Visible
(E
);
3847 -- If generic unit is in current unit, current context is correct
3850 Instantiate_Package_Body
3853 Act_Decl
=> Act_Decl
,
3854 Expander_Status
=> Expander_Active
,
3855 Current_Sem_Unit
=> Current_Sem_Unit
,
3856 Scope_Suppress
=> Scope_Suppress
,
3857 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
3858 Version
=> Ada_Version
)),
3859 Inlined_Body
=> True);
3861 end Inline_Instance_Body
;
3863 -------------------------------------
3864 -- Analyze_Procedure_Instantiation --
3865 -------------------------------------
3867 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3869 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3870 end Analyze_Procedure_Instantiation
;
3872 -----------------------------------
3873 -- Need_Subprogram_Instance_Body --
3874 -----------------------------------
3876 function Need_Subprogram_Instance_Body
3878 Subp
: Entity_Id
) return Boolean
3881 if (Is_In_Main_Unit
(N
)
3882 or else Is_Inlined
(Subp
)
3883 or else Is_Inlined
(Alias
(Subp
)))
3884 and then (Operating_Mode
= Generate_Code
3885 or else (Operating_Mode
= Check_Semantics
3886 and then ASIS_Mode
))
3887 and then (Expander_Active
or else ASIS_Mode
)
3888 and then not ABE_Is_Certain
(N
)
3889 and then not Is_Eliminated
(Subp
)
3891 Pending_Instantiations
.Append
3893 Act_Decl
=> Unit_Declaration_Node
(Subp
),
3894 Expander_Status
=> Expander_Active
,
3895 Current_Sem_Unit
=> Current_Sem_Unit
,
3896 Scope_Suppress
=> Scope_Suppress
,
3897 Local_Suppress_Stack_Top
=> Local_Suppress_Stack_Top
,
3898 Version
=> Ada_Version
));
3903 end Need_Subprogram_Instance_Body
;
3905 --------------------------------------
3906 -- Analyze_Subprogram_Instantiation --
3907 --------------------------------------
3909 procedure Analyze_Subprogram_Instantiation
3913 Loc
: constant Source_Ptr
:= Sloc
(N
);
3914 Gen_Id
: constant Node_Id
:= Name
(N
);
3916 Anon_Id
: constant Entity_Id
:=
3917 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3918 Chars
=> New_External_Name
3919 (Chars
(Defining_Entity
(N
)), 'R'));
3921 Act_Decl_Id
: Entity_Id
;
3926 Env_Installed
: Boolean := False;
3927 Gen_Unit
: Entity_Id
;
3929 Pack_Id
: Entity_Id
;
3930 Parent_Installed
: Boolean := False;
3931 Renaming_List
: List_Id
;
3933 procedure Analyze_Instance_And_Renamings
;
3934 -- The instance must be analyzed in a context that includes the mappings
3935 -- of generic parameters into actuals. We create a package declaration
3936 -- for this purpose, and a subprogram with an internal name within the
3937 -- package. The subprogram instance is simply an alias for the internal
3938 -- subprogram, declared in the current scope.
3940 ------------------------------------
3941 -- Analyze_Instance_And_Renamings --
3942 ------------------------------------
3944 procedure Analyze_Instance_And_Renamings
is
3945 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3946 Pack_Decl
: Node_Id
;
3949 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3951 -- For the case of a compilation unit, the container package has
3952 -- the same name as the instantiation, to insure that the binder
3953 -- calls the elaboration procedure with the right name. Copy the
3954 -- entity of the instance, which may have compilation level flags
3955 -- (e.g. Is_Child_Unit) set.
3957 Pack_Id
:= New_Copy
(Def_Ent
);
3960 -- Otherwise we use the name of the instantiation concatenated
3961 -- with its source position to ensure uniqueness if there are
3962 -- several instantiations with the same name.
3965 Make_Defining_Identifier
(Loc
,
3966 Chars
=> New_External_Name
3967 (Related_Id
=> Chars
(Def_Ent
),
3969 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3972 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3973 Specification
=> Make_Package_Specification
(Loc
,
3974 Defining_Unit_Name
=> Pack_Id
,
3975 Visible_Declarations
=> Renaming_List
,
3976 End_Label
=> Empty
));
3978 Set_Instance_Spec
(N
, Pack_Decl
);
3979 Set_Is_Generic_Instance
(Pack_Id
);
3980 Set_Debug_Info_Needed
(Pack_Id
);
3982 -- Case of not a compilation unit
3984 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3985 Mark_Rewrite_Insertion
(Pack_Decl
);
3986 Insert_Before
(N
, Pack_Decl
);
3987 Set_Has_Completion
(Pack_Id
);
3989 -- Case of an instantiation that is a compilation unit
3991 -- Place declaration on current node so context is complete for
3992 -- analysis (including nested instantiations), and for use in a
3993 -- context_clause (see Analyze_With_Clause).
3996 Set_Unit
(Parent
(N
), Pack_Decl
);
3997 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
4000 Analyze
(Pack_Decl
);
4001 Check_Formal_Packages
(Pack_Id
);
4002 Set_Is_Generic_Instance
(Pack_Id
, False);
4004 -- Why do we clear Is_Generic_Instance??? We set it 20 lines
4007 -- Body of the enclosing package is supplied when instantiating the
4008 -- subprogram body, after semantic analysis is completed.
4010 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4012 -- Remove package itself from visibility, so it does not
4013 -- conflict with subprogram.
4015 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
4017 -- Set name and scope of internal subprogram so that the proper
4018 -- external name will be generated. The proper scope is the scope
4019 -- of the wrapper package. We need to generate debugging info for
4020 -- the internal subprogram, so set flag accordingly.
4022 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
4023 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
4025 -- Mark wrapper package as referenced, to avoid spurious warnings
4026 -- if the instantiation appears in various with_ clauses of
4027 -- subunits of the main unit.
4029 Set_Referenced
(Pack_Id
);
4032 Set_Is_Generic_Instance
(Anon_Id
);
4033 Set_Debug_Info_Needed
(Anon_Id
);
4034 Act_Decl_Id
:= New_Copy
(Anon_Id
);
4036 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
4037 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
4038 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
4039 Set_Comes_From_Source
(Act_Decl_Id
, True);
4041 -- The signature may involve types that are not frozen yet, but the
4042 -- subprogram will be frozen at the point the wrapper package is
4043 -- frozen, so it does not need its own freeze node. In fact, if one
4044 -- is created, it might conflict with the freezing actions from the
4047 Set_Has_Delayed_Freeze
(Anon_Id
, False);
4049 -- If the instance is a child unit, mark the Id accordingly. Mark
4050 -- the anonymous entity as well, which is the real subprogram and
4051 -- which is used when the instance appears in a context clause.
4052 -- Similarly, propagate the Is_Eliminated flag to handle properly
4053 -- nested eliminated subprograms.
4055 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
4056 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
4057 New_Overloaded_Entity
(Act_Decl_Id
);
4058 Check_Eliminated
(Act_Decl_Id
);
4059 Set_Is_Eliminated
(Anon_Id
, Is_Eliminated
(Act_Decl_Id
));
4061 -- In compilation unit case, kill elaboration checks on the
4062 -- instantiation, since they are never needed -- the body is
4063 -- instantiated at the same point as the spec.
4065 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4066 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
4067 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
4068 Set_Is_Compilation_Unit
(Anon_Id
);
4070 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
4073 -- The instance is not a freezing point for the new subprogram
4075 Set_Is_Frozen
(Act_Decl_Id
, False);
4077 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
4078 Valid_Operator_Definition
(Act_Decl_Id
);
4081 Set_Alias
(Act_Decl_Id
, Anon_Id
);
4082 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
4083 Set_Has_Completion
(Act_Decl_Id
);
4084 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
4086 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4087 Set_Body_Required
(Parent
(N
), False);
4089 end Analyze_Instance_And_Renamings
;
4091 -- Start of processing for Analyze_Subprogram_Instantiation
4094 -- Very first thing: apply the special kludge for Text_IO processing
4095 -- in case we are instantiating one of the children of [Wide_]Text_IO.
4096 -- Of course such an instantiation is bogus (these are packages, not
4097 -- subprograms), but we get a better error message if we do this.
4099 Text_IO_Kludge
(Gen_Id
);
4101 -- Make node global for error reporting
4103 Instantiation_Node
:= N
;
4104 Preanalyze_Actuals
(N
);
4107 Env_Installed
:= True;
4108 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
4109 Gen_Unit
:= Entity
(Gen_Id
);
4111 Generate_Reference
(Gen_Unit
, Gen_Id
);
4113 if Nkind
(Gen_Id
) = N_Identifier
4114 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
4117 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
4120 if Etype
(Gen_Unit
) = Any_Type
then
4125 -- Verify that it is a generic subprogram of the right kind, and that
4126 -- it does not lead to a circular instantiation.
4128 if not Ekind_In
(Gen_Unit
, E_Generic_Procedure
, E_Generic_Function
) then
4129 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
4131 elsif In_Open_Scopes
(Gen_Unit
) then
4132 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
4134 elsif K
= E_Procedure
4135 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
4137 if Ekind
(Gen_Unit
) = E_Generic_Function
then
4139 ("cannot instantiate generic function as procedure", Gen_Id
);
4142 ("expect name of generic procedure in instantiation", Gen_Id
);
4145 elsif K
= E_Function
4146 and then Ekind
(Gen_Unit
) /= E_Generic_Function
4148 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
4150 ("cannot instantiate generic procedure as function", Gen_Id
);
4153 ("expect name of generic function in instantiation", Gen_Id
);
4157 Set_Entity
(Gen_Id
, Gen_Unit
);
4158 Set_Is_Instantiated
(Gen_Unit
);
4160 if In_Extended_Main_Source_Unit
(N
) then
4161 Generate_Reference
(Gen_Unit
, N
);
4164 -- If renaming, get original unit
4166 if Present
(Renamed_Object
(Gen_Unit
))
4167 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
4169 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
4171 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
4172 Set_Is_Instantiated
(Gen_Unit
);
4173 Generate_Reference
(Gen_Unit
, N
);
4176 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
4177 Error_Msg_Node_2
:= Current_Scope
;
4179 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
4180 Circularity_Detected
:= True;
4184 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
4186 -- Initialize renamings map, for error checking
4188 Generic_Renamings
.Set_Last
(0);
4189 Generic_Renamings_HTable
.Reset
;
4191 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
4193 -- Copy original generic tree, to produce text for instantiation
4197 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
4199 -- Inherit overriding indicator from instance node
4201 Act_Spec
:= Specification
(Act_Tree
);
4202 Set_Must_Override
(Act_Spec
, Must_Override
(N
));
4203 Set_Must_Not_Override
(Act_Spec
, Must_Not_Override
(N
));
4206 Analyze_Associations
4208 Generic_Formal_Declarations
(Act_Tree
),
4209 Generic_Formal_Declarations
(Gen_Decl
));
4211 -- The subprogram itself cannot contain a nested instance, so the
4212 -- current parent is left empty.
4214 Set_Instance_Env
(Gen_Unit
, Empty
);
4216 -- Build the subprogram declaration, which does not appear in the
4217 -- generic template, and give it a sloc consistent with that of the
4220 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
4221 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
4223 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
4224 Specification
=> Act_Spec
);
4226 Set_Categorization_From_Pragmas
(Act_Decl
);
4228 if Parent_Installed
then
4232 Append
(Act_Decl
, Renaming_List
);
4233 Analyze_Instance_And_Renamings
;
4235 -- If the generic is marked Import (Intrinsic), then so is the
4236 -- instance. This indicates that there is no body to instantiate. If
4237 -- generic is marked inline, so it the instance, and the anonymous
4238 -- subprogram it renames. If inlined, or else if inlining is enabled
4239 -- for the compilation, we generate the instance body even if it is
4240 -- not within the main unit.
4242 -- Any other pragmas might also be inherited ???
4244 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
4245 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
4246 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
4248 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
4249 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
4253 Generate_Definition
(Act_Decl_Id
);
4255 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
4256 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
4258 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
4259 Check_Elab_Instantiation
(N
);
4262 if Is_Dispatching_Operation
(Act_Decl_Id
)
4263 and then Ada_Version
>= Ada_2005
4269 Formal
:= First_Formal
(Act_Decl_Id
);
4270 while Present
(Formal
) loop
4271 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
4272 and then Is_Controlling_Formal
(Formal
)
4273 and then not Can_Never_Be_Null
(Formal
)
4275 Error_Msg_NE
("access parameter& is controlling,",
4278 ("\corresponding parameter of & must be"
4279 & " explicitly null-excluding", N
, Gen_Id
);
4282 Next_Formal
(Formal
);
4287 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
4289 -- Subject to change, pending on if other pragmas are inherited ???
4291 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
4293 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
4294 Inherit_Context
(Gen_Decl
, N
);
4296 Restore_Private_Views
(Pack_Id
, False);
4298 -- If the context requires a full instantiation, mark node for
4299 -- subsequent construction of the body.
4301 if Need_Subprogram_Instance_Body
(N
, Act_Decl_Id
) then
4303 Check_Forward_Instantiation
(Gen_Decl
);
4305 -- The wrapper package is always delayed, because it does not
4306 -- constitute a freeze point, but to insure that the freeze
4307 -- node is placed properly, it is created directly when
4308 -- instantiating the body (otherwise the freeze node might
4309 -- appear to early for nested instantiations).
4311 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4313 -- For ASIS purposes, indicate that the wrapper package has
4314 -- replaced the instantiation node.
4316 Rewrite
(N
, Unit
(Parent
(N
)));
4317 Set_Unit
(Parent
(N
), N
);
4320 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
4322 -- Replace instance node for library-level instantiations of
4323 -- intrinsic subprograms, for ASIS use.
4325 Rewrite
(N
, Unit
(Parent
(N
)));
4326 Set_Unit
(Parent
(N
), N
);
4329 if Parent_Installed
then
4334 Env_Installed
:= False;
4335 Generic_Renamings
.Set_Last
(0);
4336 Generic_Renamings_HTable
.Reset
;
4340 Analyze_Aspect_Specifications
4341 (N
, Act_Decl_Id
, Aspect_Specifications
(N
));
4344 when Instantiation_Error
=>
4345 if Parent_Installed
then
4349 if Env_Installed
then
4352 end Analyze_Subprogram_Instantiation
;
4354 -------------------------
4355 -- Get_Associated_Node --
4356 -------------------------
4358 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
4362 Assoc
:= Associated_Node
(N
);
4364 if Nkind
(Assoc
) /= Nkind
(N
) then
4367 elsif Nkind_In
(Assoc
, N_Aggregate
, N_Extension_Aggregate
) then
4371 -- If the node is part of an inner generic, it may itself have been
4372 -- remapped into a further generic copy. Associated_Node is otherwise
4373 -- used for the entity of the node, and will be of a different node
4374 -- kind, or else N has been rewritten as a literal or function call.
4376 while Present
(Associated_Node
(Assoc
))
4377 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
4379 Assoc
:= Associated_Node
(Assoc
);
4382 -- Follow and additional link in case the final node was rewritten.
4383 -- This can only happen with nested generic units.
4385 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
4386 and then Present
(Associated_Node
(Assoc
))
4387 and then (Nkind_In
(Associated_Node
(Assoc
), N_Function_Call
,
4388 N_Explicit_Dereference
,
4393 Assoc
:= Associated_Node
(Assoc
);
4398 end Get_Associated_Node
;
4400 -------------------------------------------
4401 -- Build_Instance_Compilation_Unit_Nodes --
4402 -------------------------------------------
4404 procedure Build_Instance_Compilation_Unit_Nodes
4409 Decl_Cunit
: Node_Id
;
4410 Body_Cunit
: Node_Id
;
4412 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
4413 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
4416 -- A new compilation unit node is built for the instance declaration
4419 Make_Compilation_Unit
(Sloc
(N
),
4420 Context_Items
=> Empty_List
,
4423 Make_Compilation_Unit_Aux
(Sloc
(N
)));
4425 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
4427 -- The new compilation unit is linked to its body, but both share the
4428 -- same file, so we do not set Body_Required on the new unit so as not
4429 -- to create a spurious dependency on a non-existent body in the ali.
4430 -- This simplifies CodePeer unit traversal.
4432 -- We use the original instantiation compilation unit as the resulting
4433 -- compilation unit of the instance, since this is the main unit.
4435 Rewrite
(N
, Act_Body
);
4436 Body_Cunit
:= Parent
(N
);
4438 -- The two compilation unit nodes are linked by the Library_Unit field
4440 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
4441 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
4443 -- Preserve the private nature of the package if needed
4445 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
4447 -- If the instance is not the main unit, its context, categorization
4448 -- and elaboration entity are not relevant to the compilation.
4450 if Body_Cunit
/= Cunit
(Main_Unit
) then
4451 Make_Instance_Unit
(Body_Cunit
, In_Main
=> False);
4455 -- The context clause items on the instantiation, which are now attached
4456 -- to the body compilation unit (since the body overwrote the original
4457 -- instantiation node), semantically belong on the spec, so copy them
4458 -- there. It's harmless to leave them on the body as well. In fact one
4459 -- could argue that they belong in both places.
4461 Citem
:= First
(Context_Items
(Body_Cunit
));
4462 while Present
(Citem
) loop
4463 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
4467 -- Propagate categorization flags on packages, so that they appear in
4468 -- the ali file for the spec of the unit.
4470 if Ekind
(New_Main
) = E_Package
then
4471 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
4472 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
4473 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
4474 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
4475 Set_Is_Remote_Call_Interface
4476 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
4479 -- Make entry in Units table, so that binder can generate call to
4480 -- elaboration procedure for body, if any.
4482 Make_Instance_Unit
(Body_Cunit
, In_Main
=> True);
4483 Main_Unit_Entity
:= New_Main
;
4484 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
4486 -- Build elaboration entity, since the instance may certainly generate
4487 -- elaboration code requiring a flag for protection.
4489 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
4490 end Build_Instance_Compilation_Unit_Nodes
;
4492 -----------------------------
4493 -- Check_Access_Definition --
4494 -----------------------------
4496 procedure Check_Access_Definition
(N
: Node_Id
) is
4499 (Ada_Version
>= Ada_2005
4500 and then Present
(Access_Definition
(N
)));
4502 end Check_Access_Definition
;
4504 -----------------------------------
4505 -- Check_Formal_Package_Instance --
4506 -----------------------------------
4508 -- If the formal has specific parameters, they must match those of the
4509 -- actual. Both of them are instances, and the renaming declarations for
4510 -- their formal parameters appear in the same order in both. The analyzed
4511 -- formal has been analyzed in the context of the current instance.
4513 procedure Check_Formal_Package_Instance
4514 (Formal_Pack
: Entity_Id
;
4515 Actual_Pack
: Entity_Id
)
4517 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
4518 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
4523 procedure Check_Mismatch
(B
: Boolean);
4524 -- Common error routine for mismatch between the parameters of the
4525 -- actual instance and those of the formal package.
4527 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
4528 -- The formal may come from a nested formal package, and the actual may
4529 -- have been constant-folded. To determine whether the two denote the
4530 -- same entity we may have to traverse several definitions to recover
4531 -- the ultimate entity that they refer to.
4533 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
4534 -- Similarly, if the formal comes from a nested formal package, the
4535 -- actual may designate the formal through multiple renamings, which
4536 -- have to be followed to determine the original variable in question.
4538 --------------------
4539 -- Check_Mismatch --
4540 --------------------
4542 procedure Check_Mismatch
(B
: Boolean) is
4543 Kind
: constant Node_Kind
:= Nkind
(Parent
(E2
));
4546 if Kind
= N_Formal_Type_Declaration
then
4549 elsif Nkind_In
(Kind
, N_Formal_Object_Declaration
,
4550 N_Formal_Package_Declaration
)
4551 or else Kind
in N_Formal_Subprogram_Declaration
4557 ("actual for & in actual instance does not match formal",
4558 Parent
(Actual_Pack
), E1
);
4562 --------------------------------
4563 -- Same_Instantiated_Constant --
4564 --------------------------------
4566 function Same_Instantiated_Constant
4567 (E1
, E2
: Entity_Id
) return Boolean
4573 while Present
(Ent
) loop
4577 elsif Ekind
(Ent
) /= E_Constant
then
4580 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
4581 if Entity
(Constant_Value
(Ent
)) = E1
then
4584 Ent
:= Entity
(Constant_Value
(Ent
));
4587 -- The actual may be a constant that has been folded. Recover
4590 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
4591 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
4598 end Same_Instantiated_Constant
;
4600 --------------------------------
4601 -- Same_Instantiated_Variable --
4602 --------------------------------
4604 function Same_Instantiated_Variable
4605 (E1
, E2
: Entity_Id
) return Boolean
4607 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
4608 -- Follow chain of renamings to the ultimate ancestor
4610 ---------------------
4611 -- Original_Entity --
4612 ---------------------
4614 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
4619 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
4620 and then Present
(Renamed_Object
(Orig
))
4621 and then Is_Entity_Name
(Renamed_Object
(Orig
))
4623 Orig
:= Entity
(Renamed_Object
(Orig
));
4627 end Original_Entity
;
4629 -- Start of processing for Same_Instantiated_Variable
4632 return Ekind
(E1
) = Ekind
(E2
)
4633 and then Original_Entity
(E1
) = Original_Entity
(E2
);
4634 end Same_Instantiated_Variable
;
4636 -- Start of processing for Check_Formal_Package_Instance
4640 and then Present
(E2
)
4642 exit when Ekind
(E1
) = E_Package
4643 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
4645 -- If the formal is the renaming of the formal package, this
4646 -- is the end of its formal part, which may occur before the
4647 -- end of the formal part in the actual in the presence of
4648 -- defaulted parameters in the formal package.
4650 exit when Nkind
(Parent
(E2
)) = N_Package_Renaming_Declaration
4651 and then Renamed_Entity
(E2
) = Scope
(E2
);
4653 -- The analysis of the actual may generate additional internal
4654 -- entities. If the formal is defaulted, there is no corresponding
4655 -- analysis and the internal entities must be skipped, until we
4656 -- find corresponding entities again.
4658 if Comes_From_Source
(E2
)
4659 and then not Comes_From_Source
(E1
)
4660 and then Chars
(E1
) /= Chars
(E2
)
4663 and then Chars
(E1
) /= Chars
(E2
)
4672 -- If the formal entity comes from a formal declaration, it was
4673 -- defaulted in the formal package, and no check is needed on it.
4675 elsif Nkind
(Parent
(E2
)) = N_Formal_Object_Declaration
then
4678 elsif Is_Type
(E1
) then
4680 -- Subtypes must statically match. E1, E2 are the local entities
4681 -- that are subtypes of the actuals. Itypes generated for other
4682 -- parameters need not be checked, the check will be performed
4683 -- on the parameters themselves.
4685 -- If E2 is a formal type declaration, it is a defaulted parameter
4686 -- and needs no checking.
4688 if not Is_Itype
(E1
)
4689 and then not Is_Itype
(E2
)
4693 or else Etype
(E1
) /= Etype
(E2
)
4694 or else not Subtypes_Statically_Match
(E1
, E2
));
4697 elsif Ekind
(E1
) = E_Constant
then
4699 -- IN parameters must denote the same static value, or the same
4700 -- constant, or the literal null.
4702 Expr1
:= Expression
(Parent
(E1
));
4704 if Ekind
(E2
) /= E_Constant
then
4705 Check_Mismatch
(True);
4708 Expr2
:= Expression
(Parent
(E2
));
4711 if Is_Static_Expression
(Expr1
) then
4713 if not Is_Static_Expression
(Expr2
) then
4714 Check_Mismatch
(True);
4716 elsif Is_Discrete_Type
(Etype
(E1
)) then
4718 V1
: constant Uint
:= Expr_Value
(Expr1
);
4719 V2
: constant Uint
:= Expr_Value
(Expr2
);
4721 Check_Mismatch
(V1
/= V2
);
4724 elsif Is_Real_Type
(Etype
(E1
)) then
4726 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
4727 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
4729 Check_Mismatch
(V1
/= V2
);
4732 elsif Is_String_Type
(Etype
(E1
))
4733 and then Nkind
(Expr1
) = N_String_Literal
4735 if Nkind
(Expr2
) /= N_String_Literal
then
4736 Check_Mismatch
(True);
4739 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
4743 elsif Is_Entity_Name
(Expr1
) then
4744 if Is_Entity_Name
(Expr2
) then
4745 if Entity
(Expr1
) = Entity
(Expr2
) then
4749 (not Same_Instantiated_Constant
4750 (Entity
(Expr1
), Entity
(Expr2
)));
4753 Check_Mismatch
(True);
4756 elsif Is_Entity_Name
(Original_Node
(Expr1
))
4757 and then Is_Entity_Name
(Expr2
)
4759 Same_Instantiated_Constant
4760 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
4764 elsif Nkind
(Expr1
) = N_Null
then
4765 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
4768 Check_Mismatch
(True);
4771 elsif Ekind
(E1
) = E_Variable
then
4772 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
4774 elsif Ekind
(E1
) = E_Package
then
4776 (Ekind
(E1
) /= Ekind
(E2
)
4777 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
4779 elsif Is_Overloadable
(E1
) then
4781 -- Verify that the actual subprograms match. Note that actuals
4782 -- that are attributes are rewritten as subprograms. If the
4783 -- subprogram in the formal package is defaulted, no check is
4784 -- needed. Note that this can only happen in Ada 2005 when the
4785 -- formal package can be partially parameterized.
4787 if Nkind
(Unit_Declaration_Node
(E1
)) =
4788 N_Subprogram_Renaming_Declaration
4789 and then From_Default
(Unit_Declaration_Node
(E1
))
4795 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
4799 raise Program_Error
;
4806 end Check_Formal_Package_Instance
;
4808 ---------------------------
4809 -- Check_Formal_Packages --
4810 ---------------------------
4812 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
4814 Formal_P
: Entity_Id
;
4817 -- Iterate through the declarations in the instance, looking for package
4818 -- renaming declarations that denote instances of formal packages. Stop
4819 -- when we find the renaming of the current package itself. The
4820 -- declaration for a formal package without a box is followed by an
4821 -- internal entity that repeats the instantiation.
4823 E
:= First_Entity
(P_Id
);
4824 while Present
(E
) loop
4825 if Ekind
(E
) = E_Package
then
4826 if Renamed_Object
(E
) = P_Id
then
4829 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4832 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4833 Formal_P
:= Next_Entity
(E
);
4834 Check_Formal_Package_Instance
(Formal_P
, E
);
4836 -- After checking, remove the internal validating package. It
4837 -- is only needed for semantic checks, and as it may contain
4838 -- generic formal declarations it should not reach gigi.
4840 Remove
(Unit_Declaration_Node
(Formal_P
));
4846 end Check_Formal_Packages
;
4848 ---------------------------------
4849 -- Check_Forward_Instantiation --
4850 ---------------------------------
4852 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
4854 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
4857 -- The instantiation appears before the generic body if we are in the
4858 -- scope of the unit containing the generic, either in its spec or in
4859 -- the package body, and before the generic body.
4861 if Ekind
(Gen_Comp
) = E_Package_Body
then
4862 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
4865 if In_Open_Scopes
(Gen_Comp
)
4866 and then No
(Corresponding_Body
(Decl
))
4871 and then not Is_Compilation_Unit
(S
)
4872 and then not Is_Child_Unit
(S
)
4874 if Ekind
(S
) = E_Package
then
4875 Set_Has_Forward_Instantiation
(S
);
4881 end Check_Forward_Instantiation
;
4883 ---------------------------
4884 -- Check_Generic_Actuals --
4885 ---------------------------
4887 -- The visibility of the actuals may be different between the point of
4888 -- generic instantiation and the instantiation of the body.
4890 procedure Check_Generic_Actuals
4891 (Instance
: Entity_Id
;
4892 Is_Formal_Box
: Boolean)
4897 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4898 -- For a formal that is an array type, the component type is often a
4899 -- previous formal in the same unit. The privacy status of the component
4900 -- type will have been examined earlier in the traversal of the
4901 -- corresponding actuals, and this status should not be modified for the
4902 -- array type itself.
4904 -- To detect this case we have to rescan the list of formals, which
4905 -- is usually short enough to ignore the resulting inefficiency.
4907 -----------------------------
4908 -- Denotes_Previous_Actual --
4909 -----------------------------
4911 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4915 Prev
:= First_Entity
(Instance
);
4916 while Present
(Prev
) loop
4918 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4919 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4920 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4933 end Denotes_Previous_Actual
;
4935 -- Start of processing for Check_Generic_Actuals
4938 E
:= First_Entity
(Instance
);
4939 while Present
(E
) loop
4941 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4942 and then Scope
(Etype
(E
)) /= Instance
4943 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4945 if Is_Array_Type
(E
)
4946 and then Denotes_Previous_Actual
(Component_Type
(E
))
4950 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4952 Set_Is_Generic_Actual_Type
(E
, True);
4953 Set_Is_Hidden
(E
, False);
4954 Set_Is_Potentially_Use_Visible
(E
,
4957 -- We constructed the generic actual type as a subtype of the
4958 -- supplied type. This means that it normally would not inherit
4959 -- subtype specific attributes of the actual, which is wrong for
4960 -- the generic case.
4962 Astype
:= Ancestor_Subtype
(E
);
4966 -- This can happen when E is an itype that is the full view of
4967 -- a private type completed, e.g. with a constrained array. In
4968 -- that case, use the first subtype, which will carry size
4969 -- information. The base type itself is unconstrained and will
4972 Astype
:= First_Subtype
(E
);
4975 Set_Size_Info
(E
, (Astype
));
4976 Set_RM_Size
(E
, RM_Size
(Astype
));
4977 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4979 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4980 Set_RM_Size
(E
, RM_Size
(Astype
));
4982 -- In nested instances, the base type of an access actual
4983 -- may itself be private, and need to be exchanged.
4985 elsif Is_Access_Type
(E
)
4986 and then Is_Private_Type
(Etype
(E
))
4989 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4992 elsif Ekind
(E
) = E_Package
then
4994 -- If this is the renaming for the current instance, we're done.
4995 -- Otherwise it is a formal package. If the corresponding formal
4996 -- was declared with a box, the (instantiations of the) generic
4997 -- formal part are also visible. Otherwise, ignore the entity
4998 -- created to validate the actuals.
5000 if Renamed_Object
(E
) = Instance
then
5003 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
5006 -- The visibility of a formal of an enclosing generic is already
5009 elsif Denotes_Formal_Package
(E
) then
5012 elsif Present
(Associated_Formal_Package
(E
))
5013 and then not Is_Generic_Formal
(E
)
5015 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
5016 Check_Generic_Actuals
(Renamed_Object
(E
), True);
5019 Check_Generic_Actuals
(Renamed_Object
(E
), False);
5022 Set_Is_Hidden
(E
, False);
5025 -- If this is a subprogram instance (in a wrapper package) the
5026 -- actual is fully visible.
5028 elsif Is_Wrapper_Package
(Instance
) then
5029 Set_Is_Hidden
(E
, False);
5031 -- If the formal package is declared with a box, or if the formal
5032 -- parameter is defaulted, it is visible in the body.
5035 or else Is_Visible_Formal
(E
)
5037 Set_Is_Hidden
(E
, False);
5042 end Check_Generic_Actuals
;
5044 ------------------------------
5045 -- Check_Generic_Child_Unit --
5046 ------------------------------
5048 procedure Check_Generic_Child_Unit
5050 Parent_Installed
: in out Boolean)
5052 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
5053 Gen_Par
: Entity_Id
:= Empty
;
5055 Inst_Par
: Entity_Id
;
5058 function Find_Generic_Child
5060 Id
: Node_Id
) return Entity_Id
;
5061 -- Search generic parent for possible child unit with the given name
5063 function In_Enclosing_Instance
return Boolean;
5064 -- Within an instance of the parent, the child unit may be denoted
5065 -- by a simple name, or an abbreviated expanded name. Examine enclosing
5066 -- scopes to locate a possible parent instantiation.
5068 ------------------------
5069 -- Find_Generic_Child --
5070 ------------------------
5072 function Find_Generic_Child
5074 Id
: Node_Id
) return Entity_Id
5079 -- If entity of name is already set, instance has already been
5080 -- resolved, e.g. in an enclosing instantiation.
5082 if Present
(Entity
(Id
)) then
5083 if Scope
(Entity
(Id
)) = Scop
then
5090 E
:= First_Entity
(Scop
);
5091 while Present
(E
) loop
5092 if Chars
(E
) = Chars
(Id
)
5093 and then Is_Child_Unit
(E
)
5095 if Is_Child_Unit
(E
)
5096 and then not Is_Visible_Child_Unit
(E
)
5099 ("generic child unit& is not visible", Gen_Id
, E
);
5111 end Find_Generic_Child
;
5113 ---------------------------
5114 -- In_Enclosing_Instance --
5115 ---------------------------
5117 function In_Enclosing_Instance
return Boolean is
5118 Enclosing_Instance
: Node_Id
;
5119 Instance_Decl
: Node_Id
;
5122 -- We do not inline any call that contains instantiations, except
5123 -- for instantiations of Unchecked_Conversion, so if we are within
5124 -- an inlined body the current instance does not require parents.
5126 if In_Inlined_Body
then
5127 pragma Assert
(Chars
(Gen_Id
) = Name_Unchecked_Conversion
);
5131 -- Loop to check enclosing scopes
5133 Enclosing_Instance
:= Current_Scope
;
5134 while Present
(Enclosing_Instance
) loop
5135 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
5137 if Ekind
(Enclosing_Instance
) = E_Package
5138 and then Is_Generic_Instance
(Enclosing_Instance
)
5140 (Generic_Parent
(Specification
(Instance_Decl
)))
5142 -- Check whether the generic we are looking for is a child of
5145 E
:= Find_Generic_Child
5146 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
5147 exit when Present
(E
);
5153 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
5165 Make_Expanded_Name
(Loc
,
5167 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
5168 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
5170 Set_Entity
(Gen_Id
, E
);
5171 Set_Etype
(Gen_Id
, Etype
(E
));
5172 Parent_Installed
:= False; -- Already in scope.
5175 end In_Enclosing_Instance
;
5177 -- Start of processing for Check_Generic_Child_Unit
5180 -- If the name of the generic is given by a selected component, it may
5181 -- be the name of a generic child unit, and the prefix is the name of an
5182 -- instance of the parent, in which case the child unit must be visible.
5183 -- If this instance is not in scope, it must be placed there and removed
5184 -- after instantiation, because what is being instantiated is not the
5185 -- original child, but the corresponding child present in the instance
5188 -- If the child is instantiated within the parent, it can be given by
5189 -- a simple name. In this case the instance is already in scope, but
5190 -- the child generic must be recovered from the generic parent as well.
5192 if Nkind
(Gen_Id
) = N_Selected_Component
then
5193 S
:= Selector_Name
(Gen_Id
);
5194 Analyze
(Prefix
(Gen_Id
));
5195 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5197 if Ekind
(Inst_Par
) = E_Package
5198 and then Present
(Renamed_Object
(Inst_Par
))
5200 Inst_Par
:= Renamed_Object
(Inst_Par
);
5203 if Ekind
(Inst_Par
) = E_Package
then
5204 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
5205 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
5207 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
5209 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
5211 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
5214 elsif Ekind
(Inst_Par
) = E_Generic_Package
5215 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
5217 -- A formal package may be a real child package, and not the
5218 -- implicit instance within a parent. In this case the child is
5219 -- not visible and has to be retrieved explicitly as well.
5221 Gen_Par
:= Inst_Par
;
5224 if Present
(Gen_Par
) then
5226 -- The prefix denotes an instantiation. The entity itself may be a
5227 -- nested generic, or a child unit.
5229 E
:= Find_Generic_Child
(Gen_Par
, S
);
5232 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
5233 Set_Entity
(Gen_Id
, E
);
5234 Set_Etype
(Gen_Id
, Etype
(E
));
5236 Set_Etype
(S
, Etype
(E
));
5238 -- Indicate that this is a reference to the parent
5240 if In_Extended_Main_Source_Unit
(Gen_Id
) then
5241 Set_Is_Instantiated
(Inst_Par
);
5244 -- A common mistake is to replicate the naming scheme of a
5245 -- hierarchy by instantiating a generic child directly, rather
5246 -- than the implicit child in a parent instance:
5248 -- generic .. package Gpar is ..
5249 -- generic .. package Gpar.Child is ..
5250 -- package Par is new Gpar ();
5253 -- package Par.Child is new Gpar.Child ();
5254 -- rather than Par.Child
5256 -- In this case the instantiation is within Par, which is an
5257 -- instance, but Gpar does not denote Par because we are not IN
5258 -- the instance of Gpar, so this is illegal. The test below
5259 -- recognizes this particular case.
5261 if Is_Child_Unit
(E
)
5262 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
5263 and then (not In_Instance
5264 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
5268 ("prefix of generic child unit must be instance of parent",
5272 if not In_Open_Scopes
(Inst_Par
)
5273 and then Nkind
(Parent
(Gen_Id
)) not in
5274 N_Generic_Renaming_Declaration
5276 Install_Parent
(Inst_Par
);
5277 Parent_Installed
:= True;
5279 elsif In_Open_Scopes
(Inst_Par
) then
5281 -- If the parent is already installed, install the actuals
5282 -- for its formal packages. This is necessary when the
5283 -- child instance is a child of the parent instance:
5284 -- in this case, the parent is placed on the scope stack
5285 -- but the formal packages are not made visible.
5287 Install_Formal_Packages
(Inst_Par
);
5291 -- If the generic parent does not contain an entity that
5292 -- corresponds to the selector, the instance doesn't either.
5293 -- Analyzing the node will yield the appropriate error message.
5294 -- If the entity is not a child unit, then it is an inner
5295 -- generic in the parent.
5303 if Is_Child_Unit
(Entity
(Gen_Id
))
5305 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5306 and then not In_Open_Scopes
(Inst_Par
)
5308 Install_Parent
(Inst_Par
);
5309 Parent_Installed
:= True;
5311 -- The generic unit may be the renaming of the implicit child
5312 -- present in an instance. In that case the parent instance is
5313 -- obtained from the name of the renamed entity.
5315 elsif Ekind
(Entity
(Gen_Id
)) = E_Generic_Package
5316 and then Present
(Renamed_Entity
(Entity
(Gen_Id
)))
5317 and then Is_Child_Unit
(Renamed_Entity
(Entity
(Gen_Id
)))
5320 Renamed_Package
: constant Node_Id
:=
5321 Name
(Parent
(Entity
(Gen_Id
)));
5323 if Nkind
(Renamed_Package
) = N_Expanded_Name
then
5324 Inst_Par
:= Entity
(Prefix
(Renamed_Package
));
5325 Install_Parent
(Inst_Par
);
5326 Parent_Installed
:= True;
5332 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
5334 -- Entity already present, analyze prefix, whose meaning may be
5335 -- an instance in the current context. If it is an instance of
5336 -- a relative within another, the proper parent may still have
5337 -- to be installed, if they are not of the same generation.
5339 Analyze
(Prefix
(Gen_Id
));
5341 -- In the unlikely case that a local declaration hides the name
5342 -- of the parent package, locate it on the homonym chain. If the
5343 -- context is an instance of the parent, the renaming entity is
5346 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5347 while Present
(Inst_Par
)
5348 and then not Is_Package_Or_Generic_Package
(Inst_Par
)
5350 Inst_Par
:= Homonym
(Inst_Par
);
5353 pragma Assert
(Present
(Inst_Par
));
5354 Set_Entity
(Prefix
(Gen_Id
), Inst_Par
);
5356 if In_Enclosing_Instance
then
5359 elsif Present
(Entity
(Gen_Id
))
5360 and then Is_Child_Unit
(Entity
(Gen_Id
))
5361 and then not In_Open_Scopes
(Inst_Par
)
5363 Install_Parent
(Inst_Par
);
5364 Parent_Installed
:= True;
5367 elsif In_Enclosing_Instance
then
5369 -- The child unit is found in some enclosing scope
5376 -- If this is the renaming of the implicit child in a parent
5377 -- instance, recover the parent name and install it.
5379 if Is_Entity_Name
(Gen_Id
) then
5380 E
:= Entity
(Gen_Id
);
5382 if Is_Generic_Unit
(E
)
5383 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
5384 and then Is_Child_Unit
(Renamed_Object
(E
))
5385 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
5386 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
5389 New_Copy_Tree
(Name
(Parent
(E
))));
5390 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
5392 if not In_Open_Scopes
(Inst_Par
) then
5393 Install_Parent
(Inst_Par
);
5394 Parent_Installed
:= True;
5397 -- If it is a child unit of a non-generic parent, it may be
5398 -- use-visible and given by a direct name. Install parent as
5401 elsif Is_Generic_Unit
(E
)
5402 and then Is_Child_Unit
(E
)
5404 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
5405 and then not Is_Generic_Unit
(Scope
(E
))
5407 if not In_Open_Scopes
(Scope
(E
)) then
5408 Install_Parent
(Scope
(E
));
5409 Parent_Installed
:= True;
5414 end Check_Generic_Child_Unit
;
5416 -----------------------------
5417 -- Check_Hidden_Child_Unit --
5418 -----------------------------
5420 procedure Check_Hidden_Child_Unit
5422 Gen_Unit
: Entity_Id
;
5423 Act_Decl_Id
: Entity_Id
)
5425 Gen_Id
: constant Node_Id
:= Name
(N
);
5428 if Is_Child_Unit
(Gen_Unit
)
5429 and then Is_Child_Unit
(Act_Decl_Id
)
5430 and then Nkind
(Gen_Id
) = N_Expanded_Name
5431 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
5432 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
5434 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
5436 ("generic unit & is implicitly declared in &",
5437 Defining_Unit_Name
(N
), Gen_Unit
);
5438 Error_Msg_N
("\instance must have different name",
5439 Defining_Unit_Name
(N
));
5441 end Check_Hidden_Child_Unit
;
5443 ------------------------
5444 -- Check_Private_View --
5445 ------------------------
5447 procedure Check_Private_View
(N
: Node_Id
) is
5448 T
: constant Entity_Id
:= Etype
(N
);
5452 -- Exchange views if the type was not private in the generic but is
5453 -- private at the point of instantiation. Do not exchange views if
5454 -- the scope of the type is in scope. This can happen if both generic
5455 -- and instance are sibling units, or if type is defined in a parent.
5456 -- In this case the visibility of the type will be correct for all
5460 BT
:= Base_Type
(T
);
5462 if Is_Private_Type
(T
)
5463 and then not Has_Private_View
(N
)
5464 and then Present
(Full_View
(T
))
5465 and then not In_Open_Scopes
(Scope
(T
))
5467 -- In the generic, the full type was visible. Save the private
5468 -- entity, for subsequent exchange.
5472 elsif Has_Private_View
(N
)
5473 and then not Is_Private_Type
(T
)
5474 and then not Has_Been_Exchanged
(T
)
5475 and then Etype
(Get_Associated_Node
(N
)) /= T
5477 -- Only the private declaration was visible in the generic. If
5478 -- the type appears in a subtype declaration, the subtype in the
5479 -- instance must have a view compatible with that of its parent,
5480 -- which must be exchanged (see corresponding code in Restore_
5481 -- Private_Views). Otherwise, if the type is defined in a parent
5482 -- unit, leave full visibility within instance, which is safe.
5484 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
5485 and then not Is_Private_Type
(Base_Type
(T
))
5486 and then Comes_From_Source
(Base_Type
(T
))
5490 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
5491 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
5493 Prepend_Elmt
(T
, Exchanged_Views
);
5494 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
5497 -- For composite types with inconsistent representation exchange
5498 -- component types accordingly.
5500 elsif Is_Access_Type
(T
)
5501 and then Is_Private_Type
(Designated_Type
(T
))
5502 and then not Has_Private_View
(N
)
5503 and then Present
(Full_View
(Designated_Type
(T
)))
5504 and then Used_As_Generic_Actual
(T
)
5506 Switch_View
(Designated_Type
(T
));
5508 elsif Is_Array_Type
(T
) then
5509 if Is_Private_Type
(Component_Type
(T
))
5510 and then not Has_Private_View
(N
)
5511 and then Present
(Full_View
(Component_Type
(T
)))
5513 Switch_View
(Component_Type
(T
));
5516 -- The normal exchange mechanism relies on the setting of a
5517 -- flag on the reference in the generic. However, an additional
5518 -- mechanism is needed for types that are not explicitly mentioned
5519 -- in the generic, but may be needed in expanded code in the
5520 -- instance. This includes component types of arrays and
5521 -- designated types of access types. This processing must also
5522 -- include the index types of arrays which we take care of here.
5529 Indx
:= First_Index
(T
);
5530 Typ
:= Base_Type
(Etype
(Indx
));
5531 while Present
(Indx
) loop
5532 if Is_Private_Type
(Typ
)
5533 and then Present
(Full_View
(Typ
))
5542 elsif Is_Private_Type
(T
)
5543 and then Present
(Full_View
(T
))
5544 and then Is_Array_Type
(Full_View
(T
))
5545 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
5549 -- Finally, a non-private subtype may have a private base type, which
5550 -- must be exchanged for consistency. This can happen when a package
5551 -- body is instantiated, when the scope stack is empty but in fact
5552 -- the subtype and the base type are declared in an enclosing scope.
5554 -- Note that in this case we introduce an inconsistency in the view
5555 -- set, because we switch the base type BT, but there could be some
5556 -- private dependent subtypes of BT which remain unswitched. Such
5557 -- subtypes might need to be switched at a later point (see specific
5558 -- provision for that case in Switch_View).
5560 elsif not Is_Private_Type
(T
)
5561 and then not Has_Private_View
(N
)
5562 and then Is_Private_Type
(BT
)
5563 and then Present
(Full_View
(BT
))
5564 and then not Is_Generic_Type
(BT
)
5565 and then not In_Open_Scopes
(BT
)
5567 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
5568 Exchange_Declarations
(BT
);
5571 end Check_Private_View
;
5573 --------------------------
5574 -- Contains_Instance_Of --
5575 --------------------------
5577 function Contains_Instance_Of
5580 N
: Node_Id
) return Boolean
5588 -- Verify that there are no circular instantiations. We check whether
5589 -- the unit contains an instance of the current scope or some enclosing
5590 -- scope (in case one of the instances appears in a subunit). Longer
5591 -- circularities involving subunits might seem too pathological to
5592 -- consider, but they were not too pathological for the authors of
5593 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
5594 -- enclosing generic scopes as containing an instance.
5597 -- Within a generic subprogram body, the scope is not generic, to
5598 -- allow for recursive subprograms. Use the declaration to determine
5599 -- whether this is a generic unit.
5601 if Ekind
(Scop
) = E_Generic_Package
5602 or else (Is_Subprogram
(Scop
)
5603 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
5604 N_Generic_Subprogram_Declaration
)
5606 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
5608 while Present
(Elmt
) loop
5609 if Node
(Elmt
) = Scop
then
5610 Error_Msg_Node_2
:= Inner
;
5612 ("circular Instantiation: & instantiated within &!",
5616 elsif Node
(Elmt
) = Inner
then
5619 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
5620 Error_Msg_Node_2
:= Inner
;
5622 ("circular Instantiation: & instantiated within &!",
5630 -- Indicate that Inner is being instantiated within Scop
5632 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
5635 if Scop
= Standard_Standard
then
5638 Scop
:= Scope
(Scop
);
5643 end Contains_Instance_Of
;
5645 -----------------------
5646 -- Copy_Generic_Node --
5647 -----------------------
5649 function Copy_Generic_Node
5651 Parent_Id
: Node_Id
;
5652 Instantiating
: Boolean) return Node_Id
5657 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
5658 -- Check the given value of one of the Fields referenced by the
5659 -- current node to determine whether to copy it recursively. The
5660 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
5661 -- value (Sloc, Uint, Char) in which case it need not be copied.
5663 procedure Copy_Descendants
;
5664 -- Common utility for various nodes
5666 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
5667 -- Make copy of element list
5669 function Copy_Generic_List
5671 Parent_Id
: Node_Id
) return List_Id
;
5672 -- Apply Copy_Node recursively to the members of a node list
5674 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
5675 -- True if an identifier is part of the defining program unit name
5676 -- of a child unit. The entity of such an identifier must be kept
5677 -- (for ASIS use) even though as the name of an enclosing generic
5678 -- it would otherwise not be preserved in the generic tree.
5680 ----------------------
5681 -- Copy_Descendants --
5682 ----------------------
5684 procedure Copy_Descendants
is
5686 use Atree
.Unchecked_Access
;
5687 -- This code section is part of the implementation of an untyped
5688 -- tree traversal, so it needs direct access to node fields.
5691 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5692 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5693 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5694 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
5695 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5696 end Copy_Descendants
;
5698 -----------------------------
5699 -- Copy_Generic_Descendant --
5700 -----------------------------
5702 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
5704 if D
= Union_Id
(Empty
) then
5707 elsif D
in Node_Range
then
5709 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
5711 elsif D
in List_Range
then
5712 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
5714 elsif D
in Elist_Range
then
5715 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
5717 -- Nothing else is copyable (e.g. Uint values), return as is
5722 end Copy_Generic_Descendant
;
5724 ------------------------
5725 -- Copy_Generic_Elist --
5726 ------------------------
5728 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
5735 M
:= First_Elmt
(E
);
5736 while Present
(M
) loop
5738 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
5747 end Copy_Generic_Elist
;
5749 -----------------------
5750 -- Copy_Generic_List --
5751 -----------------------
5753 function Copy_Generic_List
5755 Parent_Id
: Node_Id
) return List_Id
5763 Set_Parent
(New_L
, Parent_Id
);
5766 while Present
(N
) loop
5767 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
5776 end Copy_Generic_List
;
5778 ---------------------------
5779 -- In_Defining_Unit_Name --
5780 ---------------------------
5782 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
5784 return Present
(Parent
(Nam
))
5785 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
5787 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
5788 and then In_Defining_Unit_Name
(Parent
(Nam
))));
5789 end In_Defining_Unit_Name
;
5791 -- Start of processing for Copy_Generic_Node
5798 New_N
:= New_Copy
(N
);
5800 -- Copy aspects if present
5802 if Has_Aspects
(N
) then
5803 Set_Has_Aspects
(New_N
, False);
5804 Set_Aspect_Specifications
5805 (New_N
, Copy_Generic_List
(Aspect_Specifications
(N
), Parent_Id
));
5808 if Instantiating
then
5809 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
5812 if not Is_List_Member
(N
) then
5813 Set_Parent
(New_N
, Parent_Id
);
5816 -- If defining identifier, then all fields have been copied already
5818 if Nkind
(New_N
) in N_Entity
then
5821 -- Special casing for identifiers and other entity names and operators
5823 elsif Nkind_In
(New_N
, N_Identifier
,
5824 N_Character_Literal
,
5827 or else Nkind
(New_N
) in N_Op
5829 if not Instantiating
then
5831 -- Link both nodes in order to assign subsequently the entity of
5832 -- the copy to the original node, in case this is a global
5835 Set_Associated_Node
(N
, New_N
);
5837 -- If we are within an instantiation, this is a nested generic
5838 -- that has already been analyzed at the point of definition. We
5839 -- must preserve references that were global to the enclosing
5840 -- parent at that point. Other occurrences, whether global or
5841 -- local to the current generic, must be resolved anew, so we
5842 -- reset the entity in the generic copy. A global reference has a
5843 -- smaller depth than the parent, or else the same depth in case
5844 -- both are distinct compilation units.
5845 -- A child unit is implicitly declared within the enclosing parent
5846 -- but is in fact global to it, and must be preserved.
5848 -- It is also possible for Current_Instantiated_Parent to be
5849 -- defined, and for this not to be a nested generic, namely if the
5850 -- unit is loaded through Rtsfind. In that case, the entity of
5851 -- New_N is only a link to the associated node, and not a defining
5854 -- The entities for parent units in the defining_program_unit of a
5855 -- generic child unit are established when the context of the unit
5856 -- is first analyzed, before the generic copy is made. They are
5857 -- preserved in the copy for use in ASIS queries.
5859 Ent
:= Entity
(New_N
);
5861 if No
(Current_Instantiated_Parent
.Gen_Id
) then
5863 or else Nkind
(Ent
) /= N_Defining_Identifier
5864 or else not In_Defining_Unit_Name
(N
)
5866 Set_Associated_Node
(New_N
, Empty
);
5871 not Nkind_In
(Ent
, N_Defining_Identifier
,
5872 N_Defining_Character_Literal
,
5873 N_Defining_Operator_Symbol
)
5874 or else No
(Scope
(Ent
))
5876 (Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
5877 and then not Is_Child_Unit
(Ent
))
5879 (Scope_Depth
(Scope
(Ent
)) >
5880 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
5882 Get_Source_Unit
(Ent
) =
5883 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
5885 Set_Associated_Node
(New_N
, Empty
);
5888 -- Case of instantiating identifier or some other name or operator
5891 -- If the associated node is still defined, the entity in it is
5892 -- global, and must be copied to the instance. If this copy is
5893 -- being made for a body to inline, it is applied to an
5894 -- instantiated tree, and the entity is already present and must
5895 -- be also preserved.
5898 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
5901 if Present
(Assoc
) then
5902 if Nkind
(Assoc
) = Nkind
(N
) then
5903 Set_Entity
(New_N
, Entity
(Assoc
));
5904 Check_Private_View
(N
);
5906 elsif Nkind
(Assoc
) = N_Function_Call
then
5907 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
5909 elsif Nkind_In
(Assoc
, N_Defining_Identifier
,
5910 N_Defining_Character_Literal
,
5911 N_Defining_Operator_Symbol
)
5912 and then Expander_Active
5914 -- Inlining case: we are copying a tree that contains
5915 -- global entities, which are preserved in the copy to be
5916 -- used for subsequent inlining.
5921 Set_Entity
(New_N
, Empty
);
5927 -- For expanded name, we must copy the Prefix and Selector_Name
5929 if Nkind
(N
) = N_Expanded_Name
then
5931 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
5933 Set_Selector_Name
(New_N
,
5934 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
5936 -- For operators, we must copy the right operand
5938 elsif Nkind
(N
) in N_Op
then
5939 Set_Right_Opnd
(New_N
,
5940 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
5942 -- And for binary operators, the left operand as well
5944 if Nkind
(N
) in N_Binary_Op
then
5945 Set_Left_Opnd
(New_N
,
5946 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
5950 -- Special casing for stubs
5952 elsif Nkind
(N
) in N_Body_Stub
then
5954 -- In any case, we must copy the specification or defining
5955 -- identifier as appropriate.
5957 if Nkind
(N
) = N_Subprogram_Body_Stub
then
5958 Set_Specification
(New_N
,
5959 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
5962 Set_Defining_Identifier
(New_N
,
5964 (Defining_Identifier
(N
), New_N
, Instantiating
));
5967 -- If we are not instantiating, then this is where we load and
5968 -- analyze subunits, i.e. at the point where the stub occurs. A
5969 -- more permissive system might defer this analysis to the point
5970 -- of instantiation, but this seems to complicated for now.
5972 if not Instantiating
then
5974 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
5976 Unum
: Unit_Number_Type
;
5980 -- Make sure that, if it is a subunit of the main unit that is
5981 -- preprocessed and if -gnateG is specified, the preprocessed
5982 -- file will be written.
5984 Lib
.Analysing_Subunit_Of_Main
:=
5985 Lib
.In_Extended_Main_Source_Unit
(N
);
5988 (Load_Name
=> Subunit_Name
,
5992 Lib
.Analysing_Subunit_Of_Main
:= False;
5994 -- If the proper body is not found, a warning message will be
5995 -- emitted when analyzing the stub, or later at the point
5996 -- of instantiation. Here we just leave the stub as is.
5998 if Unum
= No_Unit
then
5999 Subunits_Missing
:= True;
6000 goto Subunit_Not_Found
;
6003 Subunit
:= Cunit
(Unum
);
6005 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
6007 ("found child unit instead of expected SEPARATE subunit",
6009 Error_Msg_Sloc
:= Sloc
(N
);
6010 Error_Msg_N
("\to complete stub #", Subunit
);
6011 goto Subunit_Not_Found
;
6014 -- We must create a generic copy of the subunit, in order to
6015 -- perform semantic analysis on it, and we must replace the
6016 -- stub in the original generic unit with the subunit, in order
6017 -- to preserve non-local references within.
6019 -- Only the proper body needs to be copied. Library_Unit and
6020 -- context clause are simply inherited by the generic copy.
6021 -- Note that the copy (which may be recursive if there are
6022 -- nested subunits) must be done first, before attaching it to
6023 -- the enclosing generic.
6027 (Proper_Body
(Unit
(Subunit
)),
6028 Empty
, Instantiating
=> False);
6030 -- Now place the original proper body in the original generic
6031 -- unit. This is a body, not a compilation unit.
6033 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
6034 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
6035 Set_Was_Originally_Stub
(N
);
6037 -- Finally replace the body of the subunit with its copy, and
6038 -- make this new subunit into the library unit of the generic
6039 -- copy, which does not have stubs any longer.
6041 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
6042 Set_Library_Unit
(New_N
, Subunit
);
6043 Inherit_Context
(Unit
(Subunit
), N
);
6046 -- If we are instantiating, this must be an error case, since
6047 -- otherwise we would have replaced the stub node by the proper body
6048 -- that corresponds. So just ignore it in the copy (i.e. we have
6049 -- copied it, and that is good enough).
6055 <<Subunit_Not_Found
>> null;
6057 -- If the node is a compilation unit, it is the subunit of a stub, which
6058 -- has been loaded already (see code below). In this case, the library
6059 -- unit field of N points to the parent unit (which is a compilation
6060 -- unit) and need not (and cannot!) be copied.
6062 -- When the proper body of the stub is analyzed, the library_unit link
6063 -- is used to establish the proper context (see sem_ch10).
6065 -- The other fields of a compilation unit are copied as usual
6067 elsif Nkind
(N
) = N_Compilation_Unit
then
6069 -- This code can only be executed when not instantiating, because in
6070 -- the copy made for an instantiation, the compilation unit node has
6071 -- disappeared at the point that a stub is replaced by its proper
6074 pragma Assert
(not Instantiating
);
6076 Set_Context_Items
(New_N
,
6077 Copy_Generic_List
(Context_Items
(N
), New_N
));
6080 Copy_Generic_Node
(Unit
(N
), New_N
, False));
6082 Set_First_Inlined_Subprogram
(New_N
,
6084 (First_Inlined_Subprogram
(N
), New_N
, False));
6086 Set_Aux_Decls_Node
(New_N
,
6087 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
6089 -- For an assignment node, the assignment is known to be semantically
6090 -- legal if we are instantiating the template. This avoids incorrect
6091 -- diagnostics in generated code.
6093 elsif Nkind
(N
) = N_Assignment_Statement
then
6095 -- Copy name and expression fields in usual manner
6098 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
6100 Set_Expression
(New_N
,
6101 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
6103 if Instantiating
then
6104 Set_Assignment_OK
(Name
(New_N
), True);
6107 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
6108 if not Instantiating
then
6109 Set_Associated_Node
(N
, New_N
);
6112 if Present
(Get_Associated_Node
(N
))
6113 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
6115 -- In the generic the aggregate has some composite type. If at
6116 -- the point of instantiation the type has a private view,
6117 -- install the full view (and that of its ancestors, if any).
6120 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
6125 and then Is_Private_Type
(T
)
6131 and then Is_Tagged_Type
(T
)
6132 and then Is_Derived_Type
(T
)
6134 Rt
:= Root_Type
(T
);
6139 if Is_Private_Type
(T
) then
6150 -- Do not copy the associated node, which points to
6151 -- the generic copy of the aggregate.
6154 use Atree
.Unchecked_Access
;
6155 -- This code section is part of the implementation of an untyped
6156 -- tree traversal, so it needs direct access to node fields.
6159 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
6160 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
6161 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
6162 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
6165 -- Allocators do not have an identifier denoting the access type,
6166 -- so we must locate it through the expression to check whether
6167 -- the views are consistent.
6169 elsif Nkind
(N
) = N_Allocator
6170 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
6171 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
6172 and then Instantiating
6175 T
: constant Node_Id
:=
6176 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
6182 -- Retrieve the allocator node in the generic copy
6184 Acc_T
:= Etype
(Parent
(Parent
(T
)));
6186 and then Is_Private_Type
(Acc_T
)
6188 Switch_View
(Acc_T
);
6195 -- For a proper body, we must catch the case of a proper body that
6196 -- replaces a stub. This represents the point at which a separate
6197 -- compilation unit, and hence template file, may be referenced, so we
6198 -- must make a new source instantiation entry for the template of the
6199 -- subunit, and ensure that all nodes in the subunit are adjusted using
6200 -- this new source instantiation entry.
6202 elsif Nkind
(N
) in N_Proper_Body
then
6204 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
6207 if Instantiating
and then Was_Originally_Stub
(N
) then
6208 Create_Instantiation_Source
6209 (Instantiation_Node
,
6210 Defining_Entity
(N
),
6215 -- Now copy the fields of the proper body, using the new
6216 -- adjustment factor if one was needed as per test above.
6220 -- Restore the original adjustment factor in case changed
6222 S_Adjustment
:= Save_Adjustment
;
6225 -- Don't copy Ident or Comment pragmas, since the comment belongs to the
6226 -- generic unit, not to the instantiating unit.
6228 elsif Nkind
(N
) = N_Pragma
6229 and then Instantiating
6232 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(N
);
6234 if Prag_Id
= Pragma_Ident
6235 or else Prag_Id
= Pragma_Comment
6237 New_N
:= Make_Null_Statement
(Sloc
(N
));
6243 elsif Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
6245 -- No descendant fields need traversing
6249 elsif Nkind
(N
) = N_String_Literal
6250 and then Present
(Etype
(N
))
6251 and then Instantiating
6253 -- If the string is declared in an outer scope, the string_literal
6254 -- subtype created for it may have the wrong scope. We force the
6255 -- reanalysis of the constant to generate a new itype in the proper
6258 Set_Etype
(New_N
, Empty
);
6259 Set_Analyzed
(New_N
, False);
6261 -- For the remaining nodes, copy their descendants recursively
6267 and then Nkind
(N
) = N_Subprogram_Body
6269 Set_Generic_Parent
(Specification
(New_N
), N
);
6274 end Copy_Generic_Node
;
6276 ----------------------------
6277 -- Denotes_Formal_Package --
6278 ----------------------------
6280 function Denotes_Formal_Package
6282 On_Exit
: Boolean := False;
6283 Instance
: Entity_Id
:= Empty
) return Boolean
6286 Scop
: constant Entity_Id
:= Scope
(Pack
);
6289 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean;
6290 -- The package in question may be an actual for a previous formal
6291 -- package P of the current instance, so examine its actuals as well.
6292 -- This must be recursive over other formal packages.
6294 ----------------------------------
6295 -- Is_Actual_Of_Previous_Formal --
6296 ----------------------------------
6298 function Is_Actual_Of_Previous_Formal
(P
: Entity_Id
) return Boolean is
6302 E1
:= First_Entity
(P
);
6303 while Present
(E1
) and then E1
/= Instance
loop
6304 if Ekind
(E1
) = E_Package
6305 and then Nkind
(Parent
(E1
)) = N_Package_Renaming_Declaration
6307 if Renamed_Object
(E1
) = Pack
then
6311 or else Renamed_Object
(E1
) = P
6315 elsif Is_Actual_Of_Previous_Formal
(E1
) then
6324 end Is_Actual_Of_Previous_Formal
;
6326 -- Start of processing for Denotes_Formal_Package
6332 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
6334 Par
:= Current_Instantiated_Parent
.Act_Id
;
6337 if Ekind
(Scop
) = E_Generic_Package
6338 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
6339 N_Generic_Subprogram_Declaration
6343 elsif Nkind
(Original_Node
(Unit_Declaration_Node
(Pack
))) =
6344 N_Formal_Package_Declaration
6352 -- Check whether this package is associated with a formal package of
6353 -- the enclosing instantiation. Iterate over the list of renamings.
6355 E
:= First_Entity
(Par
);
6356 while Present
(E
) loop
6357 if Ekind
(E
) /= E_Package
6358 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
6362 elsif Renamed_Object
(E
) = Par
then
6365 elsif Renamed_Object
(E
) = Pack
then
6368 elsif Is_Actual_Of_Previous_Formal
(E
) then
6378 end Denotes_Formal_Package
;
6384 procedure End_Generic
is
6386 -- ??? More things could be factored out in this routine. Should
6387 -- probably be done at a later stage.
6389 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
6390 Generic_Flags
.Decrement_Last
;
6392 Expander_Mode_Restore
;
6395 ----------------------
6396 -- Find_Actual_Type --
6397 ----------------------
6399 function Find_Actual_Type
6401 Gen_Type
: Entity_Id
) return Entity_Id
6403 Gen_Scope
: constant Entity_Id
:= Scope
(Gen_Type
);
6407 -- Special processing only applies to child units
6409 if not Is_Child_Unit
(Gen_Scope
) then
6410 return Get_Instance_Of
(Typ
);
6412 -- If designated or component type is itself a formal of the child unit,
6413 -- its instance is available.
6415 elsif Scope
(Typ
) = Gen_Scope
then
6416 return Get_Instance_Of
(Typ
);
6418 -- If the array or access type is not declared in the parent unit,
6419 -- no special processing needed.
6421 elsif not Is_Generic_Type
(Typ
)
6422 and then Scope
(Gen_Scope
) /= Scope
(Typ
)
6424 return Get_Instance_Of
(Typ
);
6426 -- Otherwise, retrieve designated or component type by visibility
6429 T
:= Current_Entity
(Typ
);
6430 while Present
(T
) loop
6431 if In_Open_Scopes
(Scope
(T
)) then
6434 elsif Is_Generic_Actual_Type
(T
) then
6443 end Find_Actual_Type
;
6445 ----------------------------
6446 -- Freeze_Subprogram_Body --
6447 ----------------------------
6449 procedure Freeze_Subprogram_Body
6450 (Inst_Node
: Node_Id
;
6452 Pack_Id
: Entity_Id
)
6455 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
6456 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
6461 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
6462 -- Yields True if N1 and N2 appear in the same compilation unit,
6463 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
6464 -- traversal of the tree for the unit.
6466 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
6467 -- Find innermost package body that encloses the given node, and which
6468 -- is not a compilation unit. Freeze nodes for the instance, or for its
6469 -- enclosing body, may be inserted after the enclosing_body of the
6472 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
6473 -- Find entity for given package body, and locate or create a freeze
6476 function True_Parent
(N
: Node_Id
) return Node_Id
;
6477 -- For a subunit, return parent of corresponding stub
6483 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
6489 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
6490 -- Find distance from given node to enclosing compilation unit
6496 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
6499 and then Nkind
(P
) /= N_Compilation_Unit
6501 P
:= True_Parent
(P
);
6506 -- Start of processing for Earlier
6509 Find_Depth
(P1
, D1
);
6510 Find_Depth
(P2
, D2
);
6520 P1
:= True_Parent
(P1
);
6525 P2
:= True_Parent
(P2
);
6529 -- At this point P1 and P2 are at the same distance from the root.
6530 -- We examine their parents until we find a common declarative
6531 -- list, at which point we can establish their relative placement
6532 -- by comparing their ultimate slocs. If we reach the root,
6533 -- N1 and N2 do not descend from the same declarative list (e.g.
6534 -- one is nested in the declarative part and the other is in a block
6535 -- in the statement part) and the earlier one is already frozen.
6537 while not Is_List_Member
(P1
)
6538 or else not Is_List_Member
(P2
)
6539 or else List_Containing
(P1
) /= List_Containing
(P2
)
6541 P1
:= True_Parent
(P1
);
6542 P2
:= True_Parent
(P2
);
6544 if Nkind
(Parent
(P1
)) = N_Subunit
then
6545 P1
:= Corresponding_Stub
(Parent
(P1
));
6548 if Nkind
(Parent
(P2
)) = N_Subunit
then
6549 P2
:= Corresponding_Stub
(Parent
(P2
));
6558 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
6561 --------------------
6562 -- Enclosing_Body --
6563 --------------------
6565 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
6566 P
: Node_Id
:= Parent
(N
);
6570 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
6572 if Nkind
(P
) = N_Package_Body
then
6574 if Nkind
(Parent
(P
)) = N_Subunit
then
6575 return Corresponding_Stub
(Parent
(P
));
6581 P
:= True_Parent
(P
);
6587 -------------------------
6588 -- Package_Freeze_Node --
6589 -------------------------
6591 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
6595 if Nkind
(B
) = N_Package_Body
then
6596 Id
:= Corresponding_Spec
(B
);
6598 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
6599 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
6602 Ensure_Freeze_Node
(Id
);
6603 return Freeze_Node
(Id
);
6604 end Package_Freeze_Node
;
6610 function True_Parent
(N
: Node_Id
) return Node_Id
is
6612 if Nkind
(Parent
(N
)) = N_Subunit
then
6613 return Parent
(Corresponding_Stub
(Parent
(N
)));
6619 -- Start of processing of Freeze_Subprogram_Body
6622 -- If the instance and the generic body appear within the same unit, and
6623 -- the instance precedes the generic, the freeze node for the instance
6624 -- must appear after that of the generic. If the generic is nested
6625 -- within another instance I2, then current instance must be frozen
6626 -- after I2. In both cases, the freeze nodes are those of enclosing
6627 -- packages. Otherwise, the freeze node is placed at the end of the
6628 -- current declarative part.
6630 Enc_G
:= Enclosing_Body
(Gen_Body
);
6631 Enc_I
:= Enclosing_Body
(Inst_Node
);
6632 Ensure_Freeze_Node
(Pack_Id
);
6633 F_Node
:= Freeze_Node
(Pack_Id
);
6635 if Is_Generic_Instance
(Par
)
6636 and then Present
(Freeze_Node
(Par
))
6638 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
6640 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
6642 -- The parent was a premature instantiation. Insert freeze node at
6643 -- the end the current declarative part.
6645 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6648 Insert_After
(Freeze_Node
(Par
), F_Node
);
6651 -- The body enclosing the instance should be frozen after the body that
6652 -- includes the generic, because the body of the instance may make
6653 -- references to entities therein. If the two are not in the same
6654 -- declarative part, or if the one enclosing the instance is frozen
6655 -- already, freeze the instance at the end of the current declarative
6658 elsif Is_Generic_Instance
(Par
)
6659 and then Present
(Freeze_Node
(Par
))
6660 and then Present
(Enc_I
)
6662 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
6664 (Nkind
(Enc_I
) = N_Package_Body
6666 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
6668 -- The enclosing package may contain several instances. Rather
6669 -- than computing the earliest point at which to insert its
6670 -- freeze node, we place it at the end of the declarative part
6671 -- of the parent of the generic.
6673 Insert_After_Last_Decl
6674 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
6677 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6679 elsif Present
(Enc_G
)
6680 and then Present
(Enc_I
)
6681 and then Enc_G
/= Enc_I
6682 and then Earlier
(Inst_Node
, Gen_Body
)
6684 if Nkind
(Enc_G
) = N_Package_Body
then
6685 E_G_Id
:= Corresponding_Spec
(Enc_G
);
6686 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
6688 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
6691 -- Freeze package that encloses instance, and place node after
6692 -- package that encloses generic. If enclosing package is already
6693 -- frozen we have to assume it is at the proper place. This may be
6694 -- a potential ABE that requires dynamic checking. Do not add a
6695 -- freeze node if the package that encloses the generic is inside
6696 -- the body that encloses the instance, because the freeze node
6697 -- would be in the wrong scope. Additional contortions needed if
6698 -- the bodies are within a subunit.
6701 Enclosing_Body
: Node_Id
;
6704 if Nkind
(Enc_I
) = N_Package_Body_Stub
then
6705 Enclosing_Body
:= Proper_Body
(Unit
(Library_Unit
(Enc_I
)));
6707 Enclosing_Body
:= Enc_I
;
6710 if Parent
(List_Containing
(Enc_G
)) /= Enclosing_Body
then
6711 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
6715 -- Freeze enclosing subunit before instance
6717 Ensure_Freeze_Node
(E_G_Id
);
6719 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
6720 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
6723 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6726 -- If none of the above, insert freeze node at the end of the current
6727 -- declarative part.
6729 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
6731 end Freeze_Subprogram_Body
;
6737 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
6739 return Generic_Renamings
.Table
(E
).Gen_Id
;
6742 ---------------------
6743 -- Get_Instance_Of --
6744 ---------------------
6746 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
6747 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
6750 if Res
/= Assoc_Null
then
6751 return Generic_Renamings
.Table
(Res
).Act_Id
;
6753 -- On exit, entity is not instantiated: not a generic parameter, or
6754 -- else parameter of an inner generic unit.
6758 end Get_Instance_Of
;
6760 ------------------------------------
6761 -- Get_Package_Instantiation_Node --
6762 ------------------------------------
6764 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
6765 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
6769 -- If the Package_Instantiation attribute has been set on the package
6770 -- entity, then use it directly when it (or its Original_Node) refers
6771 -- to an N_Package_Instantiation node. In principle it should be
6772 -- possible to have this field set in all cases, which should be
6773 -- investigated, and would allow this function to be significantly
6776 if Present
(Package_Instantiation
(A
)) then
6777 if Nkind
(Package_Instantiation
(A
)) = N_Package_Instantiation
then
6778 return Package_Instantiation
(A
);
6780 elsif Nkind
(Original_Node
(Package_Instantiation
(A
))) =
6781 N_Package_Instantiation
6783 return Original_Node
(Package_Instantiation
(A
));
6787 -- If the instantiation is a compilation unit that does not need body
6788 -- then the instantiation node has been rewritten as a package
6789 -- declaration for the instance, and we return the original node.
6791 -- If it is a compilation unit and the instance node has not been
6792 -- rewritten, then it is still the unit of the compilation. Finally, if
6793 -- a body is present, this is a parent of the main unit whose body has
6794 -- been compiled for inlining purposes, and the instantiation node has
6795 -- been rewritten with the instance body.
6797 -- Otherwise the instantiation node appears after the declaration. If
6798 -- the entity is a formal package, the declaration may have been
6799 -- rewritten as a generic declaration (in the case of a formal with box)
6800 -- or left as a formal package declaration if it has actuals, and is
6801 -- found with a forward search.
6803 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
6804 if Nkind
(Decl
) = N_Package_Declaration
6805 and then Present
(Corresponding_Body
(Decl
))
6807 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
6810 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
6811 return Original_Node
(Decl
);
6813 return Unit
(Parent
(Decl
));
6816 elsif Nkind
(Decl
) = N_Package_Declaration
6817 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
6819 return Original_Node
(Decl
);
6822 Inst
:= Next
(Decl
);
6823 while not Nkind_In
(Inst
, N_Package_Instantiation
,
6824 N_Formal_Package_Declaration
)
6831 end Get_Package_Instantiation_Node
;
6833 ------------------------
6834 -- Has_Been_Exchanged --
6835 ------------------------
6837 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
6841 Next
:= First_Elmt
(Exchanged_Views
);
6842 while Present
(Next
) loop
6843 if Full_View
(Node
(Next
)) = E
then
6851 end Has_Been_Exchanged
;
6857 function Hash
(F
: Entity_Id
) return HTable_Range
is
6859 return HTable_Range
(F
mod HTable_Size
);
6862 ------------------------
6863 -- Hide_Current_Scope --
6864 ------------------------
6866 procedure Hide_Current_Scope
is
6867 C
: constant Entity_Id
:= Current_Scope
;
6871 Set_Is_Hidden_Open_Scope
(C
);
6873 E
:= First_Entity
(C
);
6874 while Present
(E
) loop
6875 if Is_Immediately_Visible
(E
) then
6876 Set_Is_Immediately_Visible
(E
, False);
6877 Append_Elmt
(E
, Hidden_Entities
);
6883 -- Make the scope name invisible as well. This is necessary, but might
6884 -- conflict with calls to Rtsfind later on, in case the scope is a
6885 -- predefined one. There is no clean solution to this problem, so for
6886 -- now we depend on the user not redefining Standard itself in one of
6887 -- the parent units.
6889 if Is_Immediately_Visible
(C
)
6890 and then C
/= Standard_Standard
6892 Set_Is_Immediately_Visible
(C
, False);
6893 Append_Elmt
(C
, Hidden_Entities
);
6896 end Hide_Current_Scope
;
6902 procedure Init_Env
is
6903 Saved
: Instance_Env
;
6906 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
6907 Saved
.Exchanged_Views
:= Exchanged_Views
;
6908 Saved
.Hidden_Entities
:= Hidden_Entities
;
6909 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
6910 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
6911 Saved
.Instance_Parent_Unit
:= Instance_Parent_Unit
;
6913 -- Save configuration switches. These may be reset if the unit is a
6914 -- predefined unit, and the current mode is not Ada 2005.
6916 Save_Opt_Config_Switches
(Saved
.Switches
);
6918 Instance_Envs
.Append
(Saved
);
6920 Exchanged_Views
:= New_Elmt_List
;
6921 Hidden_Entities
:= New_Elmt_List
;
6923 -- Make dummy entry for Instantiated parent. If generic unit is legal,
6924 -- this is set properly in Set_Instance_Env.
6926 Current_Instantiated_Parent
:=
6927 (Current_Scope
, Current_Scope
, Assoc_Null
);
6930 ------------------------------
6931 -- In_Same_Declarative_Part --
6932 ------------------------------
6934 function In_Same_Declarative_Part
6936 Inst
: Node_Id
) return Boolean
6938 Decls
: constant Node_Id
:= Parent
(F_Node
);
6939 Nod
: Node_Id
:= Parent
(Inst
);
6942 while Present
(Nod
) loop
6946 elsif Nkind_In
(Nod
, N_Subprogram_Body
,
6954 elsif Nkind
(Nod
) = N_Subunit
then
6955 Nod
:= Corresponding_Stub
(Nod
);
6957 elsif Nkind
(Nod
) = N_Compilation_Unit
then
6961 Nod
:= Parent
(Nod
);
6966 end In_Same_Declarative_Part
;
6968 ---------------------
6969 -- In_Main_Context --
6970 ---------------------
6972 function In_Main_Context
(E
: Entity_Id
) return Boolean is
6978 if not Is_Compilation_Unit
(E
)
6979 or else Ekind
(E
) /= E_Package
6980 or else In_Private_Part
(E
)
6985 Context
:= Context_Items
(Cunit
(Main_Unit
));
6987 Clause
:= First
(Context
);
6988 while Present
(Clause
) loop
6989 if Nkind
(Clause
) = N_With_Clause
then
6990 Nam
:= Name
(Clause
);
6992 -- If the current scope is part of the context of the main unit,
6993 -- analysis of the corresponding with_clause is not complete, and
6994 -- the entity is not set. We use the Chars field directly, which
6995 -- might produce false positives in rare cases, but guarantees
6996 -- that we produce all the instance bodies we will need.
6998 if (Is_Entity_Name
(Nam
)
6999 and then Chars
(Nam
) = Chars
(E
))
7000 or else (Nkind
(Nam
) = N_Selected_Component
7001 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
7011 end In_Main_Context
;
7013 ---------------------
7014 -- Inherit_Context --
7015 ---------------------
7017 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
7018 Current_Context
: List_Id
;
7019 Current_Unit
: Node_Id
;
7024 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
7026 -- The inherited context is attached to the enclosing compilation
7027 -- unit. This is either the main unit, or the declaration for the
7028 -- main unit (in case the instantiation appears within the package
7029 -- declaration and the main unit is its body).
7031 Current_Unit
:= Parent
(Inst
);
7032 while Present
(Current_Unit
)
7033 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
7035 Current_Unit
:= Parent
(Current_Unit
);
7038 Current_Context
:= Context_Items
(Current_Unit
);
7040 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
7041 while Present
(Item
) loop
7042 if Nkind
(Item
) = N_With_Clause
then
7044 -- Take care to prevent direct cyclic with's, which can happen
7045 -- if the generic body with's the current unit. Such a case
7046 -- would result in binder errors (or run-time errors if the
7047 -- -gnatE switch is in effect), but we want to prevent it here,
7048 -- because Sem.Walk_Library_Items doesn't like cycles. Note
7049 -- that we don't bother to detect indirect cycles.
7051 if Library_Unit
(Item
) /= Current_Unit
then
7052 New_I
:= New_Copy
(Item
);
7053 Set_Implicit_With
(New_I
, True);
7054 Append
(New_I
, Current_Context
);
7061 end Inherit_Context
;
7067 procedure Initialize
is
7069 Generic_Renamings
.Init
;
7072 Generic_Renamings_HTable
.Reset
;
7073 Circularity_Detected
:= False;
7074 Exchanged_Views
:= No_Elist
;
7075 Hidden_Entities
:= No_Elist
;
7078 ----------------------------
7079 -- Insert_After_Last_Decl --
7080 ----------------------------
7082 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
7083 L
: List_Id
:= List_Containing
(N
);
7084 P
: constant Node_Id
:= Parent
(L
);
7087 if not Is_List_Member
(F_Node
) then
7088 if Nkind
(P
) = N_Package_Specification
7089 and then L
= Visible_Declarations
(P
)
7090 and then Present
(Private_Declarations
(P
))
7091 and then not Is_Empty_List
(Private_Declarations
(P
))
7093 L
:= Private_Declarations
(P
);
7096 Insert_After
(Last
(L
), F_Node
);
7098 end Insert_After_Last_Decl
;
7104 procedure Install_Body
7105 (Act_Body
: Node_Id
;
7110 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
7111 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
7112 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
7113 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
7114 Gen_Unit
: constant Node_Id
:=
7115 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
7116 Orig_Body
: Node_Id
:= Gen_Body
;
7118 Body_Unit
: Node_Id
;
7120 Must_Delay
: Boolean;
7122 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
7123 -- Find subprogram (if any) that encloses instance and/or generic body
7125 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
7126 -- If the instance is nested inside a generic unit, the Sloc of the
7127 -- instance indicates the place of the original definition, not the
7128 -- point of the current enclosing instance. Pending a better usage of
7129 -- Slocs to indicate instantiation places, we determine the place of
7130 -- origin of a node by finding the maximum sloc of any ancestor node.
7131 -- Why is this not equivalent to Top_Level_Location ???
7133 --------------------
7134 -- Enclosing_Subp --
7135 --------------------
7137 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
7138 Scop
: Entity_Id
:= Scope
(Id
);
7141 while Scop
/= Standard_Standard
7142 and then not Is_Overloadable
(Scop
)
7144 Scop
:= Scope
(Scop
);
7154 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
7161 while Present
(N1
) and then N1
/= Act_Unit
loop
7162 if Sloc
(N1
) > Res
then
7172 -- Start of processing for Install_Body
7176 -- If the body is a subunit, the freeze point is the corresponding
7177 -- stub in the current compilation, not the subunit itself.
7179 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
7180 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
7182 Orig_Body
:= Gen_Body
;
7185 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
7187 -- If the instantiation and the generic definition appear in the same
7188 -- package declaration, this is an early instantiation. If they appear
7189 -- in the same declarative part, it is an early instantiation only if
7190 -- the generic body appears textually later, and the generic body is
7191 -- also in the main unit.
7193 -- If instance is nested within a subprogram, and the generic body is
7194 -- not, the instance is delayed because the enclosing body is. If
7195 -- instance and body are within the same scope, or the same sub-
7196 -- program body, indicate explicitly that the instance is delayed.
7199 (Gen_Unit
= Act_Unit
7200 and then (Nkind_In
(Gen_Unit
, N_Package_Declaration
,
7201 N_Generic_Package_Declaration
)
7202 or else (Gen_Unit
= Body_Unit
7203 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
7204 and then Is_In_Main_Unit
(Gen_Unit
)
7205 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
7207 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
7209 -- If this is an early instantiation, the freeze node is placed after
7210 -- the generic body. Otherwise, if the generic appears in an instance,
7211 -- we cannot freeze the current instance until the outer one is frozen.
7212 -- This is only relevant if the current instance is nested within some
7213 -- inner scope not itself within the outer instance. If this scope is
7214 -- a package body in the same declarative part as the outer instance,
7215 -- then that body needs to be frozen after the outer instance. Finally,
7216 -- if no delay is needed, we place the freeze node at the end of the
7217 -- current declarative part.
7219 if Expander_Active
then
7220 Ensure_Freeze_Node
(Act_Id
);
7221 F_Node
:= Freeze_Node
(Act_Id
);
7224 Insert_After
(Orig_Body
, F_Node
);
7226 elsif Is_Generic_Instance
(Par
)
7227 and then Present
(Freeze_Node
(Par
))
7228 and then Scope
(Act_Id
) /= Par
7230 -- Freeze instance of inner generic after instance of enclosing
7233 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
7234 Insert_After
(Freeze_Node
(Par
), F_Node
);
7236 -- Freeze package enclosing instance of inner generic after
7237 -- instance of enclosing generic.
7239 elsif Nkind
(Parent
(N
)) = N_Package_Body
7240 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
7244 Enclosing
: constant Entity_Id
:=
7245 Corresponding_Spec
(Parent
(N
));
7248 Insert_After_Last_Decl
(N
, F_Node
);
7249 Ensure_Freeze_Node
(Enclosing
);
7251 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
7252 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
7257 Insert_After_Last_Decl
(N
, F_Node
);
7261 Insert_After_Last_Decl
(N
, F_Node
);
7265 Set_Is_Frozen
(Act_Id
);
7266 Insert_Before
(N
, Act_Body
);
7267 Mark_Rewrite_Insertion
(Act_Body
);
7270 -----------------------------
7271 -- Install_Formal_Packages --
7272 -----------------------------
7274 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
7277 Gen_E
: Entity_Id
:= Empty
;
7280 E
:= First_Entity
(Par
);
7282 -- In we are installing an instance parent, locate the formal packages
7283 -- of its generic parent.
7285 if Is_Generic_Instance
(Par
) then
7286 Gen
:= Generic_Parent
(Specification
(Unit_Declaration_Node
(Par
)));
7287 Gen_E
:= First_Entity
(Gen
);
7290 while Present
(E
) loop
7291 if Ekind
(E
) = E_Package
7292 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
7294 -- If this is the renaming for the parent instance, done
7296 if Renamed_Object
(E
) = Par
then
7299 -- The visibility of a formal of an enclosing generic is already
7302 elsif Denotes_Formal_Package
(E
) then
7305 elsif Present
(Associated_Formal_Package
(E
)) then
7306 Check_Generic_Actuals
(Renamed_Object
(E
), True);
7307 Set_Is_Hidden
(E
, False);
7309 -- Find formal package in generic unit that corresponds to
7310 -- (instance of) formal package in instance.
7312 while Present
(Gen_E
) and then Chars
(Gen_E
) /= Chars
(E
) loop
7313 Next_Entity
(Gen_E
);
7316 if Present
(Gen_E
) then
7317 Map_Formal_Package_Entities
(Gen_E
, E
);
7323 if Present
(Gen_E
) then
7324 Next_Entity
(Gen_E
);
7327 end Install_Formal_Packages
;
7329 --------------------
7330 -- Install_Parent --
7331 --------------------
7333 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
7334 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
7335 S
: constant Entity_Id
:= Current_Scope
;
7336 Inst_Par
: Entity_Id
;
7337 First_Par
: Entity_Id
;
7338 Inst_Node
: Node_Id
;
7339 Gen_Par
: Entity_Id
;
7340 First_Gen
: Entity_Id
;
7343 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
7344 -- Install the scopes of noninstance parent units ending with Par
7346 procedure Install_Spec
(Par
: Entity_Id
);
7347 -- The child unit is within the declarative part of the parent, so
7348 -- the declarations within the parent are immediately visible.
7350 -------------------------------
7351 -- Install_Noninstance_Specs --
7352 -------------------------------
7354 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
7357 and then Par
/= Standard_Standard
7358 and then not In_Open_Scopes
(Par
)
7360 Install_Noninstance_Specs
(Scope
(Par
));
7363 end Install_Noninstance_Specs
;
7369 procedure Install_Spec
(Par
: Entity_Id
) is
7370 Spec
: constant Node_Id
:=
7371 Specification
(Unit_Declaration_Node
(Par
));
7374 -- If this parent of the child instance is a top-level unit,
7375 -- then record the unit and its visibility for later resetting
7376 -- in Remove_Parent. We exclude units that are generic instances,
7377 -- as we only want to record this information for the ultimate
7378 -- top-level noninstance parent (is that always correct???).
7380 if Scope
(Par
) = Standard_Standard
7381 and then not Is_Generic_Instance
(Par
)
7383 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
7384 Instance_Parent_Unit
:= Par
;
7387 -- Open the parent scope and make it and its declarations visible.
7388 -- If this point is not within a body, then only the visible
7389 -- declarations should be made visible, and installation of the
7390 -- private declarations is deferred until the appropriate point
7391 -- within analysis of the spec being instantiated (see the handling
7392 -- of parent visibility in Analyze_Package_Specification). This is
7393 -- relaxed in the case where the parent unit is Ada.Tags, to avoid
7394 -- private view problems that occur when compiling instantiations of
7395 -- a generic child of that package (Generic_Dispatching_Constructor).
7396 -- If the instance freezes a tagged type, inlinings of operations
7397 -- from Ada.Tags may need the full view of type Tag. If inlining took
7398 -- proper account of establishing visibility of inlined subprograms'
7399 -- parents then it should be possible to remove this
7400 -- special check. ???
7403 Set_Is_Immediately_Visible
(Par
);
7404 Install_Visible_Declarations
(Par
);
7405 Set_Use
(Visible_Declarations
(Spec
));
7407 if In_Body
or else Is_RTU
(Par
, Ada_Tags
) then
7408 Install_Private_Declarations
(Par
);
7409 Set_Use
(Private_Declarations
(Spec
));
7413 -- Start of processing for Install_Parent
7416 -- We need to install the parent instance to compile the instantiation
7417 -- of the child, but the child instance must appear in the current
7418 -- scope. Given that we cannot place the parent above the current scope
7419 -- in the scope stack, we duplicate the current scope and unstack both
7420 -- after the instantiation is complete.
7422 -- If the parent is itself the instantiation of a child unit, we must
7423 -- also stack the instantiation of its parent, and so on. Each such
7424 -- ancestor is the prefix of the name in a prior instantiation.
7426 -- If this is a nested instance, the parent unit itself resolves to
7427 -- a renaming of the parent instance, whose declaration we need.
7429 -- Finally, the parent may be a generic (not an instance) when the
7430 -- child unit appears as a formal package.
7434 if Present
(Renamed_Entity
(Inst_Par
)) then
7435 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7438 First_Par
:= Inst_Par
;
7441 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
7443 First_Gen
:= Gen_Par
;
7445 while Present
(Gen_Par
)
7446 and then Is_Child_Unit
(Gen_Par
)
7448 -- Load grandparent instance as well
7450 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
7452 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
7453 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
7455 if Present
(Renamed_Entity
(Inst_Par
)) then
7456 Inst_Par
:= Renamed_Entity
(Inst_Par
);
7461 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
7463 if Present
(Gen_Par
) then
7464 Prepend_Elmt
(Inst_Par
, Ancestors
);
7467 -- Parent is not the name of an instantiation
7469 Install_Noninstance_Specs
(Inst_Par
);
7481 if Present
(First_Gen
) then
7482 Append_Elmt
(First_Par
, Ancestors
);
7485 Install_Noninstance_Specs
(First_Par
);
7488 if not Is_Empty_Elmt_List
(Ancestors
) then
7489 Elmt
:= First_Elmt
(Ancestors
);
7491 while Present
(Elmt
) loop
7492 Install_Spec
(Node
(Elmt
));
7493 Install_Formal_Packages
(Node
(Elmt
));
7504 --------------------------------
7505 -- Instantiate_Formal_Package --
7506 --------------------------------
7508 function Instantiate_Formal_Package
7511 Analyzed_Formal
: Node_Id
) return List_Id
7513 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7514 Actual_Pack
: Entity_Id
;
7515 Formal_Pack
: Entity_Id
;
7516 Gen_Parent
: Entity_Id
;
7519 Parent_Spec
: Node_Id
;
7521 procedure Find_Matching_Actual
7523 Act
: in out Entity_Id
);
7524 -- We need to associate each formal entity in the formal package
7525 -- with the corresponding entity in the actual package. The actual
7526 -- package has been analyzed and possibly expanded, and as a result
7527 -- there is no one-to-one correspondence between the two lists (for
7528 -- example, the actual may include subtypes, itypes, and inherited
7529 -- primitive operations, interspersed among the renaming declarations
7530 -- for the actuals) . We retrieve the corresponding actual by name
7531 -- because each actual has the same name as the formal, and they do
7532 -- appear in the same order.
7534 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
;
7535 -- Retrieve entity of defining entity of generic formal parameter.
7536 -- Only the declarations of formals need to be considered when
7537 -- linking them to actuals, but the declarative list may include
7538 -- internal entities generated during analysis, and those are ignored.
7540 procedure Match_Formal_Entity
7541 (Formal_Node
: Node_Id
;
7542 Formal_Ent
: Entity_Id
;
7543 Actual_Ent
: Entity_Id
);
7544 -- Associates the formal entity with the actual. In the case
7545 -- where Formal_Ent is a formal package, this procedure iterates
7546 -- through all of its formals and enters associations between the
7547 -- actuals occurring in the formal package's corresponding actual
7548 -- package (given by Actual_Ent) and the formal package's formal
7549 -- parameters. This procedure recurses if any of the parameters is
7550 -- itself a package.
7552 function Is_Instance_Of
7553 (Act_Spec
: Entity_Id
;
7554 Gen_Anc
: Entity_Id
) return Boolean;
7555 -- The actual can be an instantiation of a generic within another
7556 -- instance, in which case there is no direct link from it to the
7557 -- original generic ancestor. In that case, we recognize that the
7558 -- ultimate ancestor is the same by examining names and scopes.
7560 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
7561 -- If the current formal is declared with a box, its own formals are
7562 -- visible in the instance, as they were in the generic, and their
7563 -- Hidden flag must be reset. If some of these formals are themselves
7564 -- packages declared with a box, the processing must be recursive.
7566 --------------------------
7567 -- Find_Matching_Actual --
7568 --------------------------
7570 procedure Find_Matching_Actual
7572 Act
: in out Entity_Id
)
7574 Formal_Ent
: Entity_Id
;
7577 case Nkind
(Original_Node
(F
)) is
7578 when N_Formal_Object_Declaration |
7579 N_Formal_Type_Declaration
=>
7580 Formal_Ent
:= Defining_Identifier
(F
);
7582 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7586 when N_Formal_Subprogram_Declaration |
7587 N_Formal_Package_Declaration |
7588 N_Package_Declaration |
7589 N_Generic_Package_Declaration
=>
7590 Formal_Ent
:= Defining_Entity
(F
);
7592 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
7597 raise Program_Error
;
7599 end Find_Matching_Actual
;
7601 -------------------------
7602 -- Match_Formal_Entity --
7603 -------------------------
7605 procedure Match_Formal_Entity
7606 (Formal_Node
: Node_Id
;
7607 Formal_Ent
: Entity_Id
;
7608 Actual_Ent
: Entity_Id
)
7610 Act_Pkg
: Entity_Id
;
7613 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
7615 if Ekind
(Actual_Ent
) = E_Package
then
7617 -- Record associations for each parameter
7619 Act_Pkg
:= Actual_Ent
;
7622 A_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
7631 -- Retrieve the actual given in the formal package declaration
7633 Actual
:= Entity
(Name
(Original_Node
(Formal_Node
)));
7635 -- The actual in the formal package declaration may be a
7636 -- renamed generic package, in which case we want to retrieve
7637 -- the original generic in order to traverse its formal part.
7639 if Present
(Renamed_Entity
(Actual
)) then
7640 Gen_Decl
:= Unit_Declaration_Node
(Renamed_Entity
(Actual
));
7642 Gen_Decl
:= Unit_Declaration_Node
(Actual
);
7645 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
7647 if Present
(Formals
) then
7648 F_Node
:= First_Non_Pragma
(Formals
);
7653 while Present
(A_Ent
)
7654 and then Present
(F_Node
)
7655 and then A_Ent
/= First_Private_Entity
(Act_Pkg
)
7657 F_Ent
:= Get_Formal_Entity
(F_Node
);
7659 if Present
(F_Ent
) then
7661 -- This is a formal of the original package. Record
7662 -- association and recurse.
7664 Find_Matching_Actual
(F_Node
, A_Ent
);
7665 Match_Formal_Entity
(F_Node
, F_Ent
, A_Ent
);
7666 Next_Entity
(A_Ent
);
7669 Next_Non_Pragma
(F_Node
);
7673 end Match_Formal_Entity
;
7675 -----------------------
7676 -- Get_Formal_Entity --
7677 -----------------------
7679 function Get_Formal_Entity
(N
: Node_Id
) return Entity_Id
is
7680 Kind
: constant Node_Kind
:= Nkind
(Original_Node
(N
));
7683 when N_Formal_Object_Declaration
=>
7684 return Defining_Identifier
(N
);
7686 when N_Formal_Type_Declaration
=>
7687 return Defining_Identifier
(N
);
7689 when N_Formal_Subprogram_Declaration
=>
7690 return Defining_Unit_Name
(Specification
(N
));
7692 when N_Formal_Package_Declaration
=>
7693 return Defining_Identifier
(Original_Node
(N
));
7695 when N_Generic_Package_Declaration
=>
7696 return Defining_Identifier
(Original_Node
(N
));
7698 -- All other declarations are introduced by semantic analysis and
7699 -- have no match in the actual.
7704 end Get_Formal_Entity
;
7706 --------------------
7707 -- Is_Instance_Of --
7708 --------------------
7710 function Is_Instance_Of
7711 (Act_Spec
: Entity_Id
;
7712 Gen_Anc
: Entity_Id
) return Boolean
7714 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
7717 if No
(Gen_Par
) then
7720 -- Simplest case: the generic parent of the actual is the formal
7722 elsif Gen_Par
= Gen_Anc
then
7725 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
7728 -- The actual may be obtained through several instantiations. Its
7729 -- scope must itself be an instance of a generic declared in the
7730 -- same scope as the formal. Any other case is detected above.
7732 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
7736 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
7740 ---------------------------
7741 -- Process_Nested_Formal --
7742 ---------------------------
7744 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
7748 if Present
(Associated_Formal_Package
(Formal
))
7749 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
7751 Ent
:= First_Entity
(Formal
);
7752 while Present
(Ent
) loop
7753 Set_Is_Hidden
(Ent
, False);
7754 Set_Is_Visible_Formal
(Ent
);
7755 Set_Is_Potentially_Use_Visible
7756 (Ent
, Is_Potentially_Use_Visible
(Formal
));
7758 if Ekind
(Ent
) = E_Package
then
7759 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
7760 Process_Nested_Formal
(Ent
);
7766 end Process_Nested_Formal
;
7768 -- Start of processing for Instantiate_Formal_Package
7773 if not Is_Entity_Name
(Actual
)
7774 or else Ekind
(Entity
(Actual
)) /= E_Package
7777 ("expect package instance to instantiate formal", Actual
);
7778 Abandon_Instantiation
(Actual
);
7779 raise Program_Error
;
7782 Actual_Pack
:= Entity
(Actual
);
7783 Set_Is_Instantiated
(Actual_Pack
);
7785 -- The actual may be a renamed package, or an outer generic formal
7786 -- package whose instantiation is converted into a renaming.
7788 if Present
(Renamed_Object
(Actual_Pack
)) then
7789 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
7792 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
7793 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
7794 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
7797 Generic_Parent
(Specification
(Analyzed_Formal
));
7799 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7802 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
7803 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
7805 Parent_Spec
:= Parent
(Actual_Pack
);
7808 if Gen_Parent
= Any_Id
then
7810 ("previous error in declaration of formal package", Actual
);
7811 Abandon_Instantiation
(Actual
);
7814 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
7820 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
7821 Abandon_Instantiation
(Actual
);
7824 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
7825 Map_Formal_Package_Entities
(Formal_Pack
, Actual_Pack
);
7828 Make_Package_Renaming_Declaration
(Loc
,
7829 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
7830 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
7832 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
7833 Defining_Identifier
(Formal
));
7834 Decls
:= New_List
(Nod
);
7836 -- If the formal F has a box, then the generic declarations are
7837 -- visible in the generic G. In an instance of G, the corresponding
7838 -- entities in the actual for F (which are the actuals for the
7839 -- instantiation of the generic that F denotes) must also be made
7840 -- visible for analysis of the current instance. On exit from the
7841 -- current instance, those entities are made private again. If the
7842 -- actual is currently in use, these entities are also use-visible.
7844 -- The loop through the actual entities also steps through the formal
7845 -- entities and enters associations from formals to actuals into the
7846 -- renaming map. This is necessary to properly handle checking of
7847 -- actual parameter associations for later formals that depend on
7848 -- actuals declared in the formal package.
7850 -- In Ada 2005, partial parametrization requires that we make visible
7851 -- the actuals corresponding to formals that were defaulted in the
7852 -- formal package. There formals are identified because they remain
7853 -- formal generics within the formal package, rather than being
7854 -- renamings of the actuals supplied.
7857 Gen_Decl
: constant Node_Id
:=
7858 Unit_Declaration_Node
(Gen_Parent
);
7859 Formals
: constant List_Id
:=
7860 Generic_Formal_Declarations
(Gen_Decl
);
7862 Actual_Ent
: Entity_Id
;
7863 Actual_Of_Formal
: Node_Id
;
7864 Formal_Node
: Node_Id
;
7865 Formal_Ent
: Entity_Id
;
7868 if Present
(Formals
) then
7869 Formal_Node
:= First_Non_Pragma
(Formals
);
7871 Formal_Node
:= Empty
;
7874 Actual_Ent
:= First_Entity
(Actual_Pack
);
7876 First
(Visible_Declarations
(Specification
(Analyzed_Formal
)));
7877 while Present
(Actual_Ent
)
7878 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7880 if Present
(Formal_Node
) then
7881 Formal_Ent
:= Get_Formal_Entity
(Formal_Node
);
7883 if Present
(Formal_Ent
) then
7884 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
7886 (Formal_Node
, Formal_Ent
, Actual_Ent
);
7888 -- We iterate at the same time over the actuals of the
7889 -- local package created for the formal, to determine
7890 -- which one of the formals of the original generic were
7891 -- defaulted in the formal. The corresponding actual
7892 -- entities are visible in the enclosing instance.
7894 if Box_Present
(Formal
)
7896 (Present
(Actual_Of_Formal
)
7899 (Get_Formal_Entity
(Actual_Of_Formal
)))
7901 Set_Is_Hidden
(Actual_Ent
, False);
7902 Set_Is_Visible_Formal
(Actual_Ent
);
7903 Set_Is_Potentially_Use_Visible
7904 (Actual_Ent
, In_Use
(Actual_Pack
));
7906 if Ekind
(Actual_Ent
) = E_Package
then
7907 Process_Nested_Formal
(Actual_Ent
);
7911 Set_Is_Hidden
(Actual_Ent
);
7912 Set_Is_Potentially_Use_Visible
(Actual_Ent
, False);
7916 Next_Non_Pragma
(Formal_Node
);
7917 Next
(Actual_Of_Formal
);
7920 -- No further formals to match, but the generic part may
7921 -- contain inherited operation that are not hidden in the
7922 -- enclosing instance.
7924 Next_Entity
(Actual_Ent
);
7928 -- Inherited subprograms generated by formal derived types are
7929 -- also visible if the types are.
7931 Actual_Ent
:= First_Entity
(Actual_Pack
);
7932 while Present
(Actual_Ent
)
7933 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
7935 if Is_Overloadable
(Actual_Ent
)
7937 Nkind
(Parent
(Actual_Ent
)) = N_Subtype_Declaration
7939 not Is_Hidden
(Defining_Identifier
(Parent
(Actual_Ent
)))
7941 Set_Is_Hidden
(Actual_Ent
, False);
7942 Set_Is_Potentially_Use_Visible
7943 (Actual_Ent
, In_Use
(Actual_Pack
));
7946 Next_Entity
(Actual_Ent
);
7950 -- If the formal is not declared with a box, reanalyze it as an
7951 -- abbreviated instantiation, to verify the matching rules of 12.7.
7952 -- The actual checks are performed after the generic associations
7953 -- have been analyzed, to guarantee the same visibility for this
7954 -- instantiation and for the actuals.
7956 -- In Ada 2005, the generic associations for the formal can include
7957 -- defaulted parameters. These are ignored during check. This
7958 -- internal instantiation is removed from the tree after conformance
7959 -- checking, because it contains formal declarations for those
7960 -- defaulted parameters, and those should not reach the back-end.
7962 if not Box_Present
(Formal
) then
7964 I_Pack
: constant Entity_Id
:=
7965 Make_Temporary
(Sloc
(Actual
), 'P');
7968 Set_Is_Internal
(I_Pack
);
7971 Make_Package_Instantiation
(Sloc
(Actual
),
7972 Defining_Unit_Name
=> I_Pack
,
7975 (Get_Instance_Of
(Gen_Parent
), Sloc
(Actual
)),
7976 Generic_Associations
=>
7977 Generic_Associations
(Formal
)));
7983 end Instantiate_Formal_Package
;
7985 -----------------------------------
7986 -- Instantiate_Formal_Subprogram --
7987 -----------------------------------
7989 function Instantiate_Formal_Subprogram
7992 Analyzed_Formal
: Node_Id
) return Node_Id
7995 Formal_Sub
: constant Entity_Id
:=
7996 Defining_Unit_Name
(Specification
(Formal
));
7997 Analyzed_S
: constant Entity_Id
:=
7998 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
7999 Decl_Node
: Node_Id
;
8003 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
8004 -- If the generic is a child unit, the parent has been installed on the
8005 -- scope stack, but a default subprogram cannot resolve to something on
8006 -- the parent because that parent is not really part of the visible
8007 -- context (it is there to resolve explicit local entities). If the
8008 -- default has resolved in this way, we remove the entity from
8009 -- immediate visibility and analyze the node again to emit an error
8010 -- message or find another visible candidate.
8012 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
8013 -- Perform legality check and raise exception on failure
8015 -----------------------
8016 -- From_Parent_Scope --
8017 -----------------------
8019 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
8020 Gen_Scope
: Node_Id
;
8023 Gen_Scope
:= Scope
(Analyzed_S
);
8024 while Present
(Gen_Scope
)
8025 and then Is_Child_Unit
(Gen_Scope
)
8027 if Scope
(Subp
) = Scope
(Gen_Scope
) then
8031 Gen_Scope
:= Scope
(Gen_Scope
);
8035 end From_Parent_Scope
;
8037 -----------------------------
8038 -- Valid_Actual_Subprogram --
8039 -----------------------------
8041 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
8045 if Is_Entity_Name
(Act
) then
8046 Act_E
:= Entity
(Act
);
8048 elsif Nkind
(Act
) = N_Selected_Component
8049 and then Is_Entity_Name
(Selector_Name
(Act
))
8051 Act_E
:= Entity
(Selector_Name
(Act
));
8057 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
8058 or else Nkind_In
(Act
, N_Attribute_Reference
,
8059 N_Indexed_Component
,
8060 N_Character_Literal
,
8061 N_Explicit_Dereference
)
8067 ("expect subprogram or entry name in instantiation of&",
8068 Instantiation_Node
, Formal_Sub
);
8069 Abandon_Instantiation
(Instantiation_Node
);
8071 end Valid_Actual_Subprogram
;
8073 -- Start of processing for Instantiate_Formal_Subprogram
8076 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
8078 -- The tree copy has created the proper instantiation sloc for the
8079 -- new specification. Use this location for all other constructed
8082 Loc
:= Sloc
(Defining_Unit_Name
(New_Spec
));
8084 -- Create new entity for the actual (New_Copy_Tree does not)
8086 Set_Defining_Unit_Name
8087 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
8089 -- Create new entities for the each of the formals in the
8090 -- specification of the renaming declaration built for the actual.
8092 if Present
(Parameter_Specifications
(New_Spec
)) then
8096 F
:= First
(Parameter_Specifications
(New_Spec
));
8097 while Present
(F
) loop
8098 Set_Defining_Identifier
(F
,
8099 Make_Defining_Identifier
(Sloc
(F
),
8100 Chars
=> Chars
(Defining_Identifier
(F
))));
8106 -- Find entity of actual. If the actual is an attribute reference, it
8107 -- cannot be resolved here (its formal is missing) but is handled
8108 -- instead in Attribute_Renaming. If the actual is overloaded, it is
8109 -- fully resolved subsequently, when the renaming declaration for the
8110 -- formal is analyzed. If it is an explicit dereference, resolve the
8111 -- prefix but not the actual itself, to prevent interpretation as call.
8113 if Present
(Actual
) then
8114 Loc
:= Sloc
(Actual
);
8115 Set_Sloc
(New_Spec
, Loc
);
8117 if Nkind
(Actual
) = N_Operator_Symbol
then
8118 Find_Direct_Name
(Actual
);
8120 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
8121 Analyze
(Prefix
(Actual
));
8123 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
8127 Valid_Actual_Subprogram
(Actual
);
8130 elsif Present
(Default_Name
(Formal
)) then
8131 if not Nkind_In
(Default_Name
(Formal
), N_Attribute_Reference
,
8132 N_Selected_Component
,
8133 N_Indexed_Component
,
8134 N_Character_Literal
)
8135 and then Present
(Entity
(Default_Name
(Formal
)))
8137 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
8139 Nam
:= New_Copy
(Default_Name
(Formal
));
8140 Set_Sloc
(Nam
, Loc
);
8143 elsif Box_Present
(Formal
) then
8145 -- Actual is resolved at the point of instantiation. Create an
8146 -- identifier or operator with the same name as the formal.
8148 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
8149 Nam
:= Make_Operator_Symbol
(Loc
,
8150 Chars
=> Chars
(Formal_Sub
),
8151 Strval
=> No_String
);
8153 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
8156 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
8157 and then Null_Present
(Specification
(Formal
))
8159 -- Generate null body for procedure, for use in the instance
8162 Make_Subprogram_Body
(Loc
,
8163 Specification
=> New_Spec
,
8164 Declarations
=> New_List
,
8165 Handled_Statement_Sequence
=>
8166 Make_Handled_Sequence_Of_Statements
(Loc
,
8167 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
8169 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
8173 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
8175 ("missing actual&", Instantiation_Node
, Formal_Sub
);
8177 ("\in instantiation of & declared#",
8178 Instantiation_Node
, Scope
(Analyzed_S
));
8179 Abandon_Instantiation
(Instantiation_Node
);
8183 Make_Subprogram_Renaming_Declaration
(Loc
,
8184 Specification
=> New_Spec
,
8187 -- If we do not have an actual and the formal specified <> then set to
8188 -- get proper default.
8190 if No
(Actual
) and then Box_Present
(Formal
) then
8191 Set_From_Default
(Decl_Node
);
8194 -- Gather possible interpretations for the actual before analyzing the
8195 -- instance. If overloaded, it will be resolved when analyzing the
8196 -- renaming declaration.
8198 if Box_Present
(Formal
)
8199 and then No
(Actual
)
8203 if Is_Child_Unit
(Scope
(Analyzed_S
))
8204 and then Present
(Entity
(Nam
))
8206 if not Is_Overloaded
(Nam
) then
8208 if From_Parent_Scope
(Entity
(Nam
)) then
8209 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
8210 Set_Entity
(Nam
, Empty
);
8211 Set_Etype
(Nam
, Empty
);
8215 Set_Is_Immediately_Visible
(Entity
(Nam
));
8224 Get_First_Interp
(Nam
, I
, It
);
8226 while Present
(It
.Nam
) loop
8227 if From_Parent_Scope
(It
.Nam
) then
8231 Get_Next_Interp
(I
, It
);
8238 -- The generic instantiation freezes the actual. This can only be done
8239 -- once the actual is resolved, in the analysis of the renaming
8240 -- declaration. To make the formal subprogram entity available, we set
8241 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
8242 -- This is also needed in Analyze_Subprogram_Renaming for the processing
8243 -- of formal abstract subprograms.
8245 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
8247 -- We cannot analyze the renaming declaration, and thus find the actual,
8248 -- until all the actuals are assembled in the instance. For subsequent
8249 -- checks of other actuals, indicate the node that will hold the
8250 -- instance of this formal.
8252 Set_Instance_Of
(Analyzed_S
, Nam
);
8254 if Nkind
(Actual
) = N_Selected_Component
8255 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
8256 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
8258 -- The renaming declaration will create a body, which must appear
8259 -- outside of the instantiation, We move the renaming declaration
8260 -- out of the instance, and create an additional renaming inside,
8261 -- to prevent freezing anomalies.
8264 Anon_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
8267 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
8268 Insert_Before
(Instantiation_Node
, Decl_Node
);
8269 Analyze
(Decl_Node
);
8271 -- Now create renaming within the instance
8274 Make_Subprogram_Renaming_Declaration
(Loc
,
8275 Specification
=> New_Copy_Tree
(New_Spec
),
8276 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
8278 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
8279 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
8284 end Instantiate_Formal_Subprogram
;
8286 ------------------------
8287 -- Instantiate_Object --
8288 ------------------------
8290 function Instantiate_Object
8293 Analyzed_Formal
: Node_Id
) return List_Id
8295 Gen_Obj
: constant Entity_Id
:= Defining_Identifier
(Formal
);
8296 A_Gen_Obj
: constant Entity_Id
:=
8297 Defining_Identifier
(Analyzed_Formal
);
8298 Acc_Def
: Node_Id
:= Empty
;
8299 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
8300 Actual_Decl
: Node_Id
:= Empty
;
8301 Decl_Node
: Node_Id
;
8304 List
: constant List_Id
:= New_List
;
8305 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
8306 Orig_Ftyp
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
8307 Subt_Decl
: Node_Id
:= Empty
;
8308 Subt_Mark
: Node_Id
:= Empty
;
8311 if Present
(Subtype_Mark
(Formal
)) then
8312 Subt_Mark
:= Subtype_Mark
(Formal
);
8314 Check_Access_Definition
(Formal
);
8315 Acc_Def
:= Access_Definition
(Formal
);
8318 -- Sloc for error message on missing actual
8320 Error_Msg_Sloc
:= Sloc
(Scope
(A_Gen_Obj
));
8322 if Get_Instance_Of
(Gen_Obj
) /= Gen_Obj
then
8323 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
8326 Set_Parent
(List
, Parent
(Actual
));
8330 if Out_Present
(Formal
) then
8332 -- An IN OUT generic actual must be a name. The instantiation is a
8333 -- renaming declaration. The actual is the name being renamed. We
8334 -- use the actual directly, rather than a copy, because it is not
8335 -- used further in the list of actuals, and because a copy or a use
8336 -- of relocate_node is incorrect if the instance is nested within a
8337 -- generic. In order to simplify ASIS searches, the Generic_Parent
8338 -- field links the declaration to the generic association.
8343 Instantiation_Node
, Gen_Obj
);
8345 ("\in instantiation of & declared#",
8346 Instantiation_Node
, Scope
(A_Gen_Obj
));
8347 Abandon_Instantiation
(Instantiation_Node
);
8350 if Present
(Subt_Mark
) then
8352 Make_Object_Renaming_Declaration
(Loc
,
8353 Defining_Identifier
=> New_Copy
(Gen_Obj
),
8354 Subtype_Mark
=> New_Copy_Tree
(Subt_Mark
),
8357 else pragma Assert
(Present
(Acc_Def
));
8359 Make_Object_Renaming_Declaration
(Loc
,
8360 Defining_Identifier
=> New_Copy
(Gen_Obj
),
8361 Access_Definition
=> New_Copy_Tree
(Acc_Def
),
8365 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8367 -- The analysis of the actual may produce insert_action nodes, so
8368 -- the declaration must have a context in which to attach them.
8370 Append
(Decl_Node
, List
);
8373 -- Return if the analysis of the actual reported some error
8375 if Etype
(Actual
) = Any_Type
then
8379 -- This check is performed here because Analyze_Object_Renaming will
8380 -- not check it when Comes_From_Source is False. Note though that the
8381 -- check for the actual being the name of an object will be performed
8382 -- in Analyze_Object_Renaming.
8384 if Is_Object_Reference
(Actual
)
8385 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
8388 ("illegal discriminant-dependent component for in out parameter",
8392 -- The actual has to be resolved in order to check that it is a
8393 -- variable (due to cases such as F (1), where F returns access to an
8394 -- array, and for overloaded prefixes).
8396 Ftyp
:= Get_Instance_Of
(Etype
(A_Gen_Obj
));
8398 -- If the type of the formal is not itself a formal, and the
8399 -- current unit is a child unit, the formal type must be declared
8400 -- in a parent, and must be retrieved by visibility.
8403 and then Is_Generic_Unit
(Scope
(Ftyp
))
8404 and then Is_Child_Unit
(Scope
(A_Gen_Obj
))
8407 Temp
: constant Node_Id
:=
8408 New_Copy_Tree
(Subtype_Mark
(Analyzed_Formal
));
8410 Set_Entity
(Temp
, Empty
);
8412 Ftyp
:= Entity
(Temp
);
8416 if Is_Private_Type
(Ftyp
)
8417 and then not Is_Private_Type
(Etype
(Actual
))
8418 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
8419 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
8421 -- If the actual has the type of the full view of the formal, or
8422 -- else a non-private subtype of the formal, then the visibility
8423 -- of the formal type has changed. Add to the actuals a subtype
8424 -- declaration that will force the exchange of views in the body
8425 -- of the instance as well.
8428 Make_Subtype_Declaration
(Loc
,
8429 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
8430 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
8432 Prepend
(Subt_Decl
, List
);
8434 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
8435 Exchange_Declarations
(Ftyp
);
8438 Resolve
(Actual
, Ftyp
);
8440 if not Denotes_Variable
(Actual
) then
8442 ("actual for& must be a variable", Actual
, Gen_Obj
);
8444 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
8446 -- Ada 2005 (AI-423): For a generic formal object of mode in out,
8447 -- the type of the actual shall resolve to a specific anonymous
8450 if Ada_Version
< Ada_2005
8452 Ekind
(Base_Type
(Ftyp
)) /=
8453 E_Anonymous_Access_Type
8455 Ekind
(Base_Type
(Etype
(Actual
))) /=
8456 E_Anonymous_Access_Type
8458 Error_Msg_NE
("type of actual does not match type of&",
8463 Note_Possible_Modification
(Actual
, Sure
=> True);
8465 -- Check for instantiation of atomic/volatile actual for
8466 -- non-atomic/volatile formal (RM C.6 (12)).
8468 if Is_Atomic_Object
(Actual
)
8469 and then not Is_Atomic
(Orig_Ftyp
)
8472 ("cannot instantiate non-atomic formal object " &
8473 "with atomic actual", Actual
);
8475 elsif Is_Volatile_Object
(Actual
)
8476 and then not Is_Volatile
(Orig_Ftyp
)
8479 ("cannot instantiate non-volatile formal object " &
8480 "with volatile actual", Actual
);
8483 -- Formal in-parameter
8486 -- The instantiation of a generic formal in-parameter is constant
8487 -- declaration. The actual is the expression for that declaration.
8489 if Present
(Actual
) then
8490 if Present
(Subt_Mark
) then
8492 else pragma Assert
(Present
(Acc_Def
));
8497 Make_Object_Declaration
(Loc
,
8498 Defining_Identifier
=> New_Copy
(Gen_Obj
),
8499 Constant_Present
=> True,
8500 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
8501 Object_Definition
=> New_Copy_Tree
(Def
),
8502 Expression
=> Actual
);
8504 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
8506 -- A generic formal object of a tagged type is defined to be
8507 -- aliased so the new constant must also be treated as aliased.
8509 if Is_Tagged_Type
(Etype
(A_Gen_Obj
)) then
8510 Set_Aliased_Present
(Decl_Node
);
8513 Append
(Decl_Node
, List
);
8515 -- No need to repeat (pre-)analysis of some expression nodes
8516 -- already handled in Preanalyze_Actuals.
8518 if Nkind
(Actual
) /= N_Allocator
then
8521 -- Return if the analysis of the actual reported some error
8523 if Etype
(Actual
) = Any_Type
then
8529 Formal_Type
: constant Entity_Id
:= Etype
(A_Gen_Obj
);
8533 Typ
:= Get_Instance_Of
(Formal_Type
);
8535 Freeze_Before
(Instantiation_Node
, Typ
);
8537 -- If the actual is an aggregate, perform name resolution on
8538 -- its components (the analysis of an aggregate does not do it)
8539 -- to capture local names that may be hidden if the generic is
8542 if Nkind
(Actual
) = N_Aggregate
then
8543 Preanalyze_And_Resolve
(Actual
, Typ
);
8546 if Is_Limited_Type
(Typ
)
8547 and then not OK_For_Limited_Init
(Typ
, Actual
)
8550 ("initialization not allowed for limited types", Actual
);
8551 Explain_Limited_Type
(Typ
, Actual
);
8555 elsif Present
(Default_Expression
(Formal
)) then
8557 -- Use default to construct declaration
8559 if Present
(Subt_Mark
) then
8561 else pragma Assert
(Present
(Acc_Def
));
8566 Make_Object_Declaration
(Sloc
(Formal
),
8567 Defining_Identifier
=> New_Copy
(Gen_Obj
),
8568 Constant_Present
=> True,
8569 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
8570 Object_Definition
=> New_Copy
(Def
),
8571 Expression
=> New_Copy_Tree
8572 (Default_Expression
(Formal
)));
8574 Append
(Decl_Node
, List
);
8575 Set_Analyzed
(Expression
(Decl_Node
), False);
8580 Instantiation_Node
, Gen_Obj
);
8581 Error_Msg_NE
("\in instantiation of & declared#",
8582 Instantiation_Node
, Scope
(A_Gen_Obj
));
8584 if Is_Scalar_Type
(Etype
(A_Gen_Obj
)) then
8586 -- Create dummy constant declaration so that instance can be
8587 -- analyzed, to minimize cascaded visibility errors.
8589 if Present
(Subt_Mark
) then
8591 else pragma Assert
(Present
(Acc_Def
));
8596 Make_Object_Declaration
(Loc
,
8597 Defining_Identifier
=> New_Copy
(Gen_Obj
),
8598 Constant_Present
=> True,
8599 Null_Exclusion_Present
=> Null_Exclusion_Present
(Formal
),
8600 Object_Definition
=> New_Copy
(Def
),
8602 Make_Attribute_Reference
(Sloc
(Gen_Obj
),
8603 Attribute_Name
=> Name_First
,
8604 Prefix
=> New_Copy
(Def
)));
8606 Append
(Decl_Node
, List
);
8609 Abandon_Instantiation
(Instantiation_Node
);
8614 if Nkind
(Actual
) in N_Has_Entity
then
8615 Actual_Decl
:= Parent
(Entity
(Actual
));
8618 -- Ada 2005 (AI-423): For a formal object declaration with a null
8619 -- exclusion or an access definition that has a null exclusion: If the
8620 -- actual matching the formal object declaration denotes a generic
8621 -- formal object of another generic unit G, and the instantiation
8622 -- containing the actual occurs within the body of G or within the body
8623 -- of a generic unit declared within the declarative region of G, then
8624 -- the declaration of the formal object of G must have a null exclusion.
8625 -- Otherwise, the subtype of the actual matching the formal object
8626 -- declaration shall exclude null.
8628 if Ada_Version
>= Ada_2005
8629 and then Present
(Actual_Decl
)
8631 Nkind_In
(Actual_Decl
, N_Formal_Object_Declaration
,
8632 N_Object_Declaration
)
8633 and then Nkind
(Analyzed_Formal
) = N_Formal_Object_Declaration
8634 and then not Has_Null_Exclusion
(Actual_Decl
)
8635 and then Has_Null_Exclusion
(Analyzed_Formal
)
8637 Error_Msg_Sloc
:= Sloc
(Analyzed_Formal
);
8639 ("actual must exclude null to match generic formal#", Actual
);
8643 end Instantiate_Object
;
8645 ------------------------------
8646 -- Instantiate_Package_Body --
8647 ------------------------------
8649 procedure Instantiate_Package_Body
8650 (Body_Info
: Pending_Body_Info
;
8651 Inlined_Body
: Boolean := False;
8652 Body_Optional
: Boolean := False)
8654 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8655 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8656 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8658 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8659 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8660 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8661 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
8662 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
8664 Act_Body_Name
: Node_Id
;
8666 Gen_Body_Id
: Node_Id
;
8668 Act_Body_Id
: Entity_Id
;
8670 Parent_Installed
: Boolean := False;
8671 Save_Style_Check
: constant Boolean := Style_Check
;
8673 Par_Ent
: Entity_Id
:= Empty
;
8674 Par_Vis
: Boolean := False;
8677 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8679 -- The instance body may already have been processed, as the parent of
8680 -- another instance that is inlined (Load_Parent_Of_Generic).
8682 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8686 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8688 -- Re-establish the state of information on which checks are suppressed.
8689 -- This information was set in Body_Info at the point of instantiation,
8690 -- and now we restore it so that the instance is compiled using the
8691 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8693 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8694 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8695 Opt
.Ada_Version
:= Body_Info
.Version
;
8697 if No
(Gen_Body_Id
) then
8698 Load_Parent_Of_Generic
8699 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8700 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8703 -- Establish global variable for sloc adjustment and for error recovery
8705 Instantiation_Node
:= Inst_Node
;
8707 if Present
(Gen_Body_Id
) then
8708 Save_Env
(Gen_Unit
, Act_Decl_Id
);
8709 Style_Check
:= False;
8710 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
8712 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8714 Create_Instantiation_Source
8715 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
8719 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
8721 -- Build new name (possibly qualified) for body declaration
8723 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
8725 -- Some attributes of spec entity are not inherited by body entity
8727 Set_Handler_Records
(Act_Body_Id
, No_List
);
8729 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8730 N_Defining_Program_Unit_Name
8733 Make_Defining_Program_Unit_Name
(Loc
,
8734 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
8735 Defining_Identifier
=> Act_Body_Id
);
8737 Act_Body_Name
:= Act_Body_Id
;
8740 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
8742 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
8743 Check_Generic_Actuals
(Act_Decl_Id
, False);
8745 -- If it is a child unit, make the parent instance (which is an
8746 -- instance of the parent of the generic) visible. The parent
8747 -- instance is the prefix of the name of the generic unit.
8749 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
8750 and then Nkind
(Gen_Id
) = N_Expanded_Name
8752 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
8753 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
8754 Install_Parent
(Par_Ent
, In_Body
=> True);
8755 Parent_Installed
:= True;
8757 elsif Is_Child_Unit
(Gen_Unit
) then
8758 Par_Ent
:= Scope
(Gen_Unit
);
8759 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
8760 Install_Parent
(Par_Ent
, In_Body
=> True);
8761 Parent_Installed
:= True;
8764 -- If the instantiation is a library unit, and this is the main unit,
8765 -- then build the resulting compilation unit nodes for the instance.
8766 -- If this is a compilation unit but it is not the main unit, then it
8767 -- is the body of a unit in the context, that is being compiled
8768 -- because it is encloses some inlined unit or another generic unit
8769 -- being instantiated. In that case, this body is not part of the
8770 -- current compilation, and is not attached to the tree, but its
8771 -- parent must be set for analysis.
8773 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8775 -- Replace instance node with body of instance, and create new
8776 -- node for corresponding instance declaration.
8778 Build_Instance_Compilation_Unit_Nodes
8779 (Inst_Node
, Act_Body
, Act_Decl
);
8780 Analyze
(Inst_Node
);
8782 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
8784 -- If the instance is a child unit itself, then set the scope
8785 -- of the expanded body to be the parent of the instantiation
8786 -- (ensuring that the fully qualified name will be generated
8787 -- for the elaboration subprogram).
8789 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
8790 N_Defining_Program_Unit_Name
8793 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
8797 -- Case where instantiation is not a library unit
8800 -- If this is an early instantiation, i.e. appears textually
8801 -- before the corresponding body and must be elaborated first,
8802 -- indicate that the body instance is to be delayed.
8804 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
8806 -- Now analyze the body. We turn off all checks if this is an
8807 -- internal unit, since there is no reason to have checks on for
8808 -- any predefined run-time library code. All such code is designed
8809 -- to be compiled with checks off.
8811 -- Note that we do NOT apply this criterion to children of GNAT
8812 -- (or on VMS, children of DEC). The latter units must suppress
8813 -- checks explicitly if this is needed.
8815 if Is_Predefined_File_Name
8816 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
8818 Analyze
(Act_Body
, Suppress
=> All_Checks
);
8824 Inherit_Context
(Gen_Body
, Inst_Node
);
8826 -- Remove the parent instances if they have been placed on the scope
8827 -- stack to compile the body.
8829 if Parent_Installed
then
8830 Remove_Parent
(In_Body
=> True);
8832 -- Restore the previous visibility of the parent
8834 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
8837 Restore_Private_Views
(Act_Decl_Id
);
8839 -- Remove the current unit from visibility if this is an instance
8840 -- that is not elaborated on the fly for inlining purposes.
8842 if not Inlined_Body
then
8843 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
8847 Style_Check
:= Save_Style_Check
;
8849 -- If we have no body, and the unit requires a body, then complain. This
8850 -- complaint is suppressed if we have detected other errors (since a
8851 -- common reason for missing the body is that it had errors).
8852 -- In CodePeer mode, a warning has been emitted already, no need for
8853 -- further messages.
8855 elsif Unit_Requires_Body
(Gen_Unit
)
8856 and then not Body_Optional
8858 if CodePeer_Mode
then
8861 elsif Serious_Errors_Detected
= 0 then
8863 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
8865 -- Don't attempt to perform any cleanup actions if some other error
8866 -- was already detected, since this can cause blowups.
8872 -- Case of package that does not need a body
8875 -- If the instantiation of the declaration is a library unit, rewrite
8876 -- the original package instantiation as a package declaration in the
8877 -- compilation unit node.
8879 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
8880 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
8881 Rewrite
(Inst_Node
, Act_Decl
);
8883 -- Generate elaboration entity, in case spec has elaboration code.
8884 -- This cannot be done when the instance is analyzed, because it
8885 -- is not known yet whether the body exists.
8887 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
8888 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
8890 -- If the instantiation is not a library unit, then append the
8891 -- declaration to the list of implicitly generated entities, unless
8892 -- it is already a list member which means that it was already
8895 elsif not Is_List_Member
(Act_Decl
) then
8896 Mark_Rewrite_Insertion
(Act_Decl
);
8897 Insert_Before
(Inst_Node
, Act_Decl
);
8901 Expander_Mode_Restore
;
8902 end Instantiate_Package_Body
;
8904 ---------------------------------
8905 -- Instantiate_Subprogram_Body --
8906 ---------------------------------
8908 procedure Instantiate_Subprogram_Body
8909 (Body_Info
: Pending_Body_Info
;
8910 Body_Optional
: Boolean := False)
8912 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
8913 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
8914 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
8915 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
8916 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
8917 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
8918 Anon_Id
: constant Entity_Id
:=
8919 Defining_Unit_Name
(Specification
(Act_Decl
));
8920 Pack_Id
: constant Entity_Id
:=
8921 Defining_Unit_Name
(Parent
(Act_Decl
));
8924 Gen_Body_Id
: Node_Id
;
8926 Pack_Body
: Node_Id
;
8927 Prev_Formal
: Entity_Id
;
8929 Unit_Renaming
: Node_Id
;
8931 Parent_Installed
: Boolean := False;
8932 Save_Style_Check
: constant Boolean := Style_Check
;
8934 Par_Ent
: Entity_Id
:= Empty
;
8935 Par_Vis
: Boolean := False;
8938 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8940 -- Subprogram body may have been created already because of an inline
8941 -- pragma, or because of multiple elaborations of the enclosing package
8942 -- when several instances of the subprogram appear in the main unit.
8944 if Present
(Corresponding_Body
(Act_Decl
)) then
8948 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
8950 -- Re-establish the state of information on which checks are suppressed.
8951 -- This information was set in Body_Info at the point of instantiation,
8952 -- and now we restore it so that the instance is compiled using the
8953 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01).
8955 Local_Suppress_Stack_Top
:= Body_Info
.Local_Suppress_Stack_Top
;
8956 Scope_Suppress
:= Body_Info
.Scope_Suppress
;
8957 Opt
.Ada_Version
:= Body_Info
.Version
;
8959 if No
(Gen_Body_Id
) then
8961 -- For imported generic subprogram, no body to compile, complete
8962 -- the spec entity appropriately.
8964 if Is_Imported
(Gen_Unit
) then
8965 Set_Is_Imported
(Anon_Id
);
8966 Set_First_Rep_Item
(Anon_Id
, First_Rep_Item
(Gen_Unit
));
8967 Set_Interface_Name
(Anon_Id
, Interface_Name
(Gen_Unit
));
8968 Set_Convention
(Anon_Id
, Convention
(Gen_Unit
));
8969 Set_Has_Completion
(Anon_Id
);
8972 -- For other cases, compile the body
8975 Load_Parent_Of_Generic
8976 (Inst_Node
, Specification
(Gen_Decl
), Body_Optional
);
8977 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
8981 Instantiation_Node
:= Inst_Node
;
8983 if Present
(Gen_Body_Id
) then
8984 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
8986 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
8988 -- Either body is not present, or context is non-expanding, as
8989 -- when compiling a subunit. Mark the instance as completed, and
8990 -- diagnose a missing body when needed.
8993 and then Operating_Mode
= Generate_Code
8996 ("missing proper body for instantiation", Gen_Body
);
8999 Set_Has_Completion
(Anon_Id
);
9003 Save_Env
(Gen_Unit
, Anon_Id
);
9004 Style_Check
:= False;
9005 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
9006 Create_Instantiation_Source
9014 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
9016 -- Create proper defining name for the body, to correspond to
9017 -- the one in the spec.
9019 Set_Defining_Unit_Name
(Specification
(Act_Body
),
9020 Make_Defining_Identifier
9021 (Sloc
(Defining_Entity
(Inst_Node
)), Chars
(Anon_Id
)));
9022 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
9023 Set_Has_Completion
(Anon_Id
);
9024 Check_Generic_Actuals
(Pack_Id
, False);
9026 -- Generate a reference to link the visible subprogram instance to
9027 -- the generic body, which for navigation purposes is the only
9028 -- available source for the instance.
9031 (Related_Instance
(Pack_Id
),
9032 Gen_Body_Id
, 'b', Set_Ref
=> False, Force
=> True);
9034 -- If it is a child unit, make the parent instance (which is an
9035 -- instance of the parent of the generic) visible. The parent
9036 -- instance is the prefix of the name of the generic unit.
9038 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
9039 and then Nkind
(Gen_Id
) = N_Expanded_Name
9041 Par_Ent
:= Entity
(Prefix
(Gen_Id
));
9042 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
9043 Install_Parent
(Par_Ent
, In_Body
=> True);
9044 Parent_Installed
:= True;
9046 elsif Is_Child_Unit
(Gen_Unit
) then
9047 Par_Ent
:= Scope
(Gen_Unit
);
9048 Par_Vis
:= Is_Immediately_Visible
(Par_Ent
);
9049 Install_Parent
(Par_Ent
, In_Body
=> True);
9050 Parent_Installed
:= True;
9053 -- Inside its body, a reference to the generic unit is a reference
9054 -- to the instance. The corresponding renaming is the first
9055 -- declaration in the body.
9058 Make_Subprogram_Renaming_Declaration
(Loc
,
9061 Specification
(Original_Node
(Gen_Body
)),
9063 Instantiating
=> True),
9064 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
9066 -- If there is a formal subprogram with the same name as the unit
9067 -- itself, do not add this renaming declaration. This is a temporary
9068 -- fix for one ACVC test. ???
9070 Prev_Formal
:= First_Entity
(Pack_Id
);
9071 while Present
(Prev_Formal
) loop
9072 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
9073 and then Is_Overloadable
(Prev_Formal
)
9078 Next_Entity
(Prev_Formal
);
9081 if Present
(Prev_Formal
) then
9082 Decls
:= New_List
(Act_Body
);
9084 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
9087 -- The subprogram body is placed in the body of a dummy package body,
9088 -- whose spec contains the subprogram declaration as well as the
9089 -- renaming declarations for the generic parameters.
9091 Pack_Body
:= Make_Package_Body
(Loc
,
9092 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
9093 Declarations
=> Decls
);
9095 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
9097 -- If the instantiation is a library unit, then build resulting
9098 -- compilation unit nodes for the instance. The declaration of
9099 -- the enclosing package is the grandparent of the subprogram
9100 -- declaration. First replace the instantiation node as the unit
9101 -- of the corresponding compilation.
9103 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
9104 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
9105 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
9106 Build_Instance_Compilation_Unit_Nodes
9107 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
9108 Analyze
(Inst_Node
);
9110 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
9111 Analyze
(Pack_Body
);
9115 Insert_Before
(Inst_Node
, Pack_Body
);
9116 Mark_Rewrite_Insertion
(Pack_Body
);
9117 Analyze
(Pack_Body
);
9119 if Expander_Active
then
9120 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
9124 Inherit_Context
(Gen_Body
, Inst_Node
);
9126 Restore_Private_Views
(Pack_Id
, False);
9128 if Parent_Installed
then
9129 Remove_Parent
(In_Body
=> True);
9131 -- Restore the previous visibility of the parent
9133 Set_Is_Immediately_Visible
(Par_Ent
, Par_Vis
);
9137 Style_Check
:= Save_Style_Check
;
9139 -- Body not found. Error was emitted already. If there were no previous
9140 -- errors, this may be an instance whose scope is a premature instance.
9141 -- In that case we must insure that the (legal) program does raise
9142 -- program error if executed. We generate a subprogram body for this
9143 -- purpose. See DEC ac30vso.
9145 -- Should not reference proprietary DEC tests in comments ???
9147 elsif Serious_Errors_Detected
= 0
9148 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
9150 if Body_Optional
then
9153 elsif Ekind
(Anon_Id
) = E_Procedure
then
9155 Make_Subprogram_Body
(Loc
,
9157 Make_Procedure_Specification
(Loc
,
9158 Defining_Unit_Name
=>
9159 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
9160 Parameter_Specifications
=>
9162 (Parameter_Specifications
(Parent
(Anon_Id
)))),
9164 Declarations
=> Empty_List
,
9165 Handled_Statement_Sequence
=>
9166 Make_Handled_Sequence_Of_Statements
(Loc
,
9169 Make_Raise_Program_Error
(Loc
,
9171 PE_Access_Before_Elaboration
))));
9175 Make_Raise_Program_Error
(Loc
,
9176 Reason
=> PE_Access_Before_Elaboration
);
9178 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
9179 Set_Analyzed
(Ret_Expr
);
9182 Make_Subprogram_Body
(Loc
,
9184 Make_Function_Specification
(Loc
,
9185 Defining_Unit_Name
=>
9186 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
9187 Parameter_Specifications
=>
9189 (Parameter_Specifications
(Parent
(Anon_Id
))),
9190 Result_Definition
=>
9191 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
9193 Declarations
=> Empty_List
,
9194 Handled_Statement_Sequence
=>
9195 Make_Handled_Sequence_Of_Statements
(Loc
,
9198 (Make_Simple_Return_Statement
(Loc
, Ret_Expr
))));
9201 Pack_Body
:= Make_Package_Body
(Loc
,
9202 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
9203 Declarations
=> New_List
(Act_Body
));
9205 Insert_After
(Inst_Node
, Pack_Body
);
9206 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
9207 Analyze
(Pack_Body
);
9210 Expander_Mode_Restore
;
9211 end Instantiate_Subprogram_Body
;
9213 ----------------------
9214 -- Instantiate_Type --
9215 ----------------------
9217 function Instantiate_Type
9220 Analyzed_Formal
: Node_Id
;
9221 Actual_Decls
: List_Id
) return List_Id
9223 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
9224 A_Gen_T
: constant Entity_Id
:=
9225 Defining_Identifier
(Analyzed_Formal
);
9226 Ancestor
: Entity_Id
:= Empty
;
9227 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
9229 Decl_Node
: Node_Id
;
9230 Decl_Nodes
: List_Id
;
9234 procedure Validate_Array_Type_Instance
;
9235 procedure Validate_Access_Subprogram_Instance
;
9236 procedure Validate_Access_Type_Instance
;
9237 procedure Validate_Derived_Type_Instance
;
9238 procedure Validate_Derived_Interface_Type_Instance
;
9239 procedure Validate_Interface_Type_Instance
;
9240 procedure Validate_Private_Type_Instance
;
9241 -- These procedures perform validation tests for the named case
9243 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
9244 -- Check that base types are the same and that the subtypes match
9245 -- statically. Used in several of the above.
9247 --------------------
9248 -- Subtypes_Match --
9249 --------------------
9251 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
9252 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
9255 return (Base_Type
(T
) = Base_Type
(Act_T
)
9256 and then Subtypes_Statically_Match
(T
, Act_T
))
9258 or else (Is_Class_Wide_Type
(Gen_T
)
9259 and then Is_Class_Wide_Type
(Act_T
)
9262 (Get_Instance_Of
(Root_Type
(Gen_T
)),
9266 ((Ekind
(Gen_T
) = E_Anonymous_Access_Subprogram_Type
9267 or else Ekind
(Gen_T
) = E_Anonymous_Access_Type
)
9268 and then Ekind
(Act_T
) = Ekind
(Gen_T
)
9270 Subtypes_Statically_Match
9271 (Designated_Type
(Gen_T
), Designated_Type
(Act_T
)));
9274 -----------------------------------------
9275 -- Validate_Access_Subprogram_Instance --
9276 -----------------------------------------
9278 procedure Validate_Access_Subprogram_Instance
is
9280 if not Is_Access_Type
(Act_T
)
9281 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
9284 ("expect access type in instantiation of &", Actual
, Gen_T
);
9285 Abandon_Instantiation
(Actual
);
9288 Check_Mode_Conformant
9289 (Designated_Type
(Act_T
),
9290 Designated_Type
(A_Gen_T
),
9294 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
9295 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
9297 ("protected access type not allowed for formal &",
9301 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
9303 ("expect protected access type for formal &",
9306 end Validate_Access_Subprogram_Instance
;
9308 -----------------------------------
9309 -- Validate_Access_Type_Instance --
9310 -----------------------------------
9312 procedure Validate_Access_Type_Instance
is
9313 Desig_Type
: constant Entity_Id
:=
9314 Find_Actual_Type
(Designated_Type
(A_Gen_T
), A_Gen_T
);
9315 Desig_Act
: Entity_Id
;
9318 if not Is_Access_Type
(Act_T
) then
9320 ("expect access type in instantiation of &", Actual
, Gen_T
);
9321 Abandon_Instantiation
(Actual
);
9324 if Is_Access_Constant
(A_Gen_T
) then
9325 if not Is_Access_Constant
(Act_T
) then
9327 ("actual type must be access-to-constant type", Actual
);
9328 Abandon_Instantiation
(Actual
);
9331 if Is_Access_Constant
(Act_T
) then
9333 ("actual type must be access-to-variable type", Actual
);
9334 Abandon_Instantiation
(Actual
);
9336 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
9337 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
9339 Error_Msg_N
-- CODEFIX
9340 ("actual must be general access type!", Actual
);
9341 Error_Msg_NE
-- CODEFIX
9342 ("add ALL to }!", Actual
, Act_T
);
9343 Abandon_Instantiation
(Actual
);
9347 -- The designated subtypes, that is to say the subtypes introduced
9348 -- by an access type declaration (and not by a subtype declaration)
9351 Desig_Act
:= Designated_Type
(Base_Type
(Act_T
));
9353 -- The designated type may have been introduced through a limited_
9354 -- with clause, in which case retrieve the non-limited view. This
9355 -- applies to incomplete types as well as to class-wide types.
9357 if From_With_Type
(Desig_Act
) then
9358 Desig_Act
:= Available_View
(Desig_Act
);
9361 if not Subtypes_Match
9362 (Desig_Type
, Desig_Act
) then
9364 ("designated type of actual does not match that of formal &",
9366 Abandon_Instantiation
(Actual
);
9368 elsif Is_Access_Type
(Designated_Type
(Act_T
))
9369 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
9371 Is_Constrained
(Designated_Type
(Desig_Type
))
9374 ("designated type of actual does not match that of formal &",
9376 Abandon_Instantiation
(Actual
);
9379 -- Ada 2005: null-exclusion indicators of the two types must agree
9381 if Can_Never_Be_Null
(A_Gen_T
) /= Can_Never_Be_Null
(Act_T
) then
9383 ("non null exclusion of actual and formal & do not match",
9386 end Validate_Access_Type_Instance
;
9388 ----------------------------------
9389 -- Validate_Array_Type_Instance --
9390 ----------------------------------
9392 procedure Validate_Array_Type_Instance
is
9397 function Formal_Dimensions
return Int
;
9398 -- Count number of dimensions in array type formal
9400 -----------------------
9401 -- Formal_Dimensions --
9402 -----------------------
9404 function Formal_Dimensions
return Int
is
9409 if Nkind
(Def
) = N_Constrained_Array_Definition
then
9410 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
9412 Index
:= First
(Subtype_Marks
(Def
));
9415 while Present
(Index
) loop
9421 end Formal_Dimensions
;
9423 -- Start of processing for Validate_Array_Type_Instance
9426 if not Is_Array_Type
(Act_T
) then
9428 ("expect array type in instantiation of &", Actual
, Gen_T
);
9429 Abandon_Instantiation
(Actual
);
9431 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
9432 if not (Is_Constrained
(Act_T
)) then
9434 ("expect constrained array in instantiation of &",
9436 Abandon_Instantiation
(Actual
);
9440 if Is_Constrained
(Act_T
) then
9442 ("expect unconstrained array in instantiation of &",
9444 Abandon_Instantiation
(Actual
);
9448 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
9450 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
9451 Abandon_Instantiation
(Actual
);
9454 I1
:= First_Index
(A_Gen_T
);
9455 I2
:= First_Index
(Act_T
);
9456 for J
in 1 .. Formal_Dimensions
loop
9458 -- If the indexes of the actual were given by a subtype_mark,
9459 -- the index was transformed into a range attribute. Retrieve
9460 -- the original type mark for checking.
9462 if Is_Entity_Name
(Original_Node
(I2
)) then
9463 T2
:= Entity
(Original_Node
(I2
));
9468 if not Subtypes_Match
9469 (Find_Actual_Type
(Etype
(I1
), A_Gen_T
), T2
)
9472 ("index types of actual do not match those of formal &",
9474 Abandon_Instantiation
(Actual
);
9481 -- Check matching subtypes. Note that there are complex visibility
9482 -- issues when the generic is a child unit and some aspect of the
9483 -- generic type is declared in a parent unit of the generic. We do
9484 -- the test to handle this special case only after a direct check
9485 -- for static matching has failed.
9488 (Component_Type
(A_Gen_T
), Component_Type
(Act_T
))
9489 or else Subtypes_Match
9490 (Find_Actual_Type
(Component_Type
(A_Gen_T
), A_Gen_T
),
9491 Component_Type
(Act_T
))
9496 ("component subtype of actual does not match that of formal &",
9498 Abandon_Instantiation
(Actual
);
9501 if Has_Aliased_Components
(A_Gen_T
)
9502 and then not Has_Aliased_Components
(Act_T
)
9505 ("actual must have aliased components to match formal type &",
9508 end Validate_Array_Type_Instance
;
9510 -----------------------------------------------
9511 -- Validate_Derived_Interface_Type_Instance --
9512 -----------------------------------------------
9514 procedure Validate_Derived_Interface_Type_Instance
is
9515 Par
: constant Entity_Id
:= Entity
(Subtype_Indication
(Def
));
9519 -- First apply interface instance checks
9521 Validate_Interface_Type_Instance
;
9523 -- Verify that immediate parent interface is an ancestor of
9527 and then not Interface_Present_In_Ancestor
(Act_T
, Par
)
9530 ("interface actual must include progenitor&", Actual
, Par
);
9533 -- Now verify that the actual includes all other ancestors of
9536 Elmt
:= First_Elmt
(Interfaces
(A_Gen_T
));
9537 while Present
(Elmt
) loop
9538 if not Interface_Present_In_Ancestor
9539 (Act_T
, Get_Instance_Of
(Node
(Elmt
)))
9542 ("interface actual must include progenitor&",
9543 Actual
, Node
(Elmt
));
9548 end Validate_Derived_Interface_Type_Instance
;
9550 ------------------------------------
9551 -- Validate_Derived_Type_Instance --
9552 ------------------------------------
9554 procedure Validate_Derived_Type_Instance
is
9555 Actual_Discr
: Entity_Id
;
9556 Ancestor_Discr
: Entity_Id
;
9559 -- If the parent type in the generic declaration is itself a previous
9560 -- formal type, then it is local to the generic and absent from the
9561 -- analyzed generic definition. In that case the ancestor is the
9562 -- instance of the formal (which must have been instantiated
9563 -- previously), unless the ancestor is itself a formal derived type.
9564 -- In this latter case (which is the subject of Corrigendum 8652/0038
9565 -- (AI-202) the ancestor of the formals is the ancestor of its
9566 -- parent. Otherwise, the analyzed generic carries the parent type.
9567 -- If the parent type is defined in a previous formal package, then
9568 -- the scope of that formal package is that of the generic type
9569 -- itself, and it has already been mapped into the corresponding type
9570 -- in the actual package.
9572 -- Common case: parent type defined outside of the generic
9574 if Is_Entity_Name
(Subtype_Mark
(Def
))
9575 and then Present
(Entity
(Subtype_Mark
(Def
)))
9577 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
9579 -- Check whether parent is defined in a previous formal package
9582 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
9585 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
9587 -- The type may be a local derivation, or a type extension of a
9588 -- previous formal, or of a formal of a parent package.
9590 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
9592 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
9594 -- Check whether the parent is another derived formal type in the
9595 -- same generic unit.
9597 if Etype
(A_Gen_T
) /= A_Gen_T
9598 and then Is_Generic_Type
(Etype
(A_Gen_T
))
9599 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
9600 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
9602 -- Locate ancestor of parent from the subtype declaration
9603 -- created for the actual.
9609 Decl
:= First
(Actual_Decls
);
9610 while Present
(Decl
) loop
9611 if Nkind
(Decl
) = N_Subtype_Declaration
9612 and then Chars
(Defining_Identifier
(Decl
)) =
9613 Chars
(Etype
(A_Gen_T
))
9615 Ancestor
:= Generic_Parent_Type
(Decl
);
9623 pragma Assert
(Present
(Ancestor
));
9627 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
9631 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
9634 -- If the formal derived type has pragma Preelaborable_Initialization
9635 -- then the actual type must have preelaborable initialization.
9637 if Known_To_Have_Preelab_Init
(A_Gen_T
)
9638 and then not Has_Preelaborable_Initialization
(Act_T
)
9641 ("actual for & must have preelaborable initialization",
9645 -- Ada 2005 (AI-251)
9647 if Ada_Version
>= Ada_2005
9648 and then Is_Interface
(Ancestor
)
9650 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
9652 ("(Ada 2005) expected type implementing & in instantiation",
9656 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
9658 ("expect type derived from & in instantiation",
9659 Actual
, First_Subtype
(Ancestor
));
9660 Abandon_Instantiation
(Actual
);
9663 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note
9664 -- that the formal type declaration has been rewritten as a private
9667 if Ada_Version
>= Ada_2005
9668 and then Nkind
(Parent
(A_Gen_T
)) = N_Private_Extension_Declaration
9669 and then Synchronized_Present
(Parent
(A_Gen_T
))
9671 -- The actual must be a synchronized tagged type
9673 if not Is_Tagged_Type
(Act_T
) then
9675 ("actual of synchronized type must be tagged", Actual
);
9676 Abandon_Instantiation
(Actual
);
9678 elsif Nkind
(Parent
(Act_T
)) = N_Full_Type_Declaration
9679 and then Nkind
(Type_Definition
(Parent
(Act_T
))) =
9680 N_Derived_Type_Definition
9681 and then not Synchronized_Present
(Type_Definition
9685 ("actual of synchronized type must be synchronized", Actual
);
9686 Abandon_Instantiation
(Actual
);
9690 -- Perform atomic/volatile checks (RM C.6(12))
9692 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
9694 ("cannot have atomic actual type for non-atomic formal type",
9697 elsif Is_Volatile
(Act_T
)
9698 and then not Is_Volatile
(Ancestor
)
9699 and then Is_By_Reference_Type
(Ancestor
)
9702 ("cannot have volatile actual type for non-volatile formal type",
9706 -- It should not be necessary to check for unknown discriminants on
9707 -- Formal, but for some reason Has_Unknown_Discriminants is false for
9708 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This
9709 -- needs fixing. ???
9711 if not Is_Indefinite_Subtype
(A_Gen_T
)
9712 and then not Unknown_Discriminants_Present
(Formal
)
9713 and then Is_Indefinite_Subtype
(Act_T
)
9716 ("actual subtype must be constrained", Actual
);
9717 Abandon_Instantiation
(Actual
);
9720 if not Unknown_Discriminants_Present
(Formal
) then
9721 if Is_Constrained
(Ancestor
) then
9722 if not Is_Constrained
(Act_T
) then
9724 ("actual subtype must be constrained", Actual
);
9725 Abandon_Instantiation
(Actual
);
9728 -- Ancestor is unconstrained, Check if generic formal and actual
9729 -- agree on constrainedness. The check only applies to array types
9730 -- and discriminated types.
9732 elsif Is_Constrained
(Act_T
) then
9733 if Ekind
(Ancestor
) = E_Access_Type
9735 (not Is_Constrained
(A_Gen_T
)
9736 and then Is_Composite_Type
(A_Gen_T
))
9739 ("actual subtype must be unconstrained", Actual
);
9740 Abandon_Instantiation
(Actual
);
9743 -- A class-wide type is only allowed if the formal has unknown
9746 elsif Is_Class_Wide_Type
(Act_T
)
9747 and then not Has_Unknown_Discriminants
(Ancestor
)
9750 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
9751 Abandon_Instantiation
(Actual
);
9753 -- Otherwise, the formal and actual shall have the same number
9754 -- of discriminants and each discriminant of the actual must
9755 -- correspond to a discriminant of the formal.
9757 elsif Has_Discriminants
(Act_T
)
9758 and then not Has_Unknown_Discriminants
(Act_T
)
9759 and then Has_Discriminants
(Ancestor
)
9761 Actual_Discr
:= First_Discriminant
(Act_T
);
9762 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
9763 while Present
(Actual_Discr
)
9764 and then Present
(Ancestor_Discr
)
9766 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
9767 No
(Corresponding_Discriminant
(Actual_Discr
))
9770 ("discriminant & does not correspond " &
9771 "to ancestor discriminant", Actual
, Actual_Discr
);
9772 Abandon_Instantiation
(Actual
);
9775 Next_Discriminant
(Actual_Discr
);
9776 Next_Discriminant
(Ancestor_Discr
);
9779 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
9781 ("actual for & must have same number of discriminants",
9783 Abandon_Instantiation
(Actual
);
9786 -- This case should be caught by the earlier check for
9787 -- constrainedness, but the check here is added for completeness.
9789 elsif Has_Discriminants
(Act_T
)
9790 and then not Has_Unknown_Discriminants
(Act_T
)
9793 ("actual for & must not have discriminants", Actual
, Gen_T
);
9794 Abandon_Instantiation
(Actual
);
9796 elsif Has_Discriminants
(Ancestor
) then
9798 ("actual for & must have known discriminants", Actual
, Gen_T
);
9799 Abandon_Instantiation
(Actual
);
9802 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
9804 ("constraint on actual is incompatible with formal", Actual
);
9805 Abandon_Instantiation
(Actual
);
9809 -- If the formal and actual types are abstract, check that there
9810 -- are no abstract primitives of the actual type that correspond to
9811 -- nonabstract primitives of the formal type (second sentence of
9814 if Is_Abstract_Type
(A_Gen_T
) and then Is_Abstract_Type
(Act_T
) then
9815 Check_Abstract_Primitives
: declare
9816 Gen_Prims
: constant Elist_Id
:=
9817 Primitive_Operations
(A_Gen_T
);
9819 Gen_Subp
: Entity_Id
;
9820 Anc_Subp
: Entity_Id
;
9821 Anc_Formal
: Entity_Id
;
9822 Anc_F_Type
: Entity_Id
;
9824 Act_Prims
: constant Elist_Id
:= Primitive_Operations
(Act_T
);
9826 Act_Subp
: Entity_Id
;
9827 Act_Formal
: Entity_Id
;
9828 Act_F_Type
: Entity_Id
;
9830 Subprograms_Correspond
: Boolean;
9832 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean;
9833 -- Returns true if T2 is derived directly or indirectly from
9834 -- T1, including derivations from interfaces. T1 and T2 are
9835 -- required to be specific tagged base types.
9837 ------------------------
9838 -- Is_Tagged_Ancestor --
9839 ------------------------
9841 function Is_Tagged_Ancestor
(T1
, T2
: Entity_Id
) return Boolean
9843 Intfc_Elmt
: Elmt_Id
;
9846 -- The predicate is satisfied if the types are the same
9851 -- If we've reached the top of the derivation chain then
9852 -- we know that T1 is not an ancestor of T2.
9854 elsif Etype
(T2
) = T2
then
9857 -- Proceed to check T2's immediate parent
9859 elsif Is_Ancestor
(T1
, Base_Type
(Etype
(T2
))) then
9862 -- Finally, check to see if T1 is an ancestor of any of T2's
9866 Intfc_Elmt
:= First_Elmt
(Interfaces
(T2
));
9867 while Present
(Intfc_Elmt
) loop
9868 if Is_Ancestor
(T1
, Node
(Intfc_Elmt
)) then
9872 Next_Elmt
(Intfc_Elmt
);
9877 end Is_Tagged_Ancestor
;
9879 -- Start of processing for Check_Abstract_Primitives
9882 -- Loop over all of the formal derived type's primitives
9884 Gen_Elmt
:= First_Elmt
(Gen_Prims
);
9885 while Present
(Gen_Elmt
) loop
9886 Gen_Subp
:= Node
(Gen_Elmt
);
9888 -- If the primitive of the formal is not abstract, then
9889 -- determine whether there is a corresponding primitive of
9890 -- the actual type that's abstract.
9892 if not Is_Abstract_Subprogram
(Gen_Subp
) then
9893 Act_Elmt
:= First_Elmt
(Act_Prims
);
9894 while Present
(Act_Elmt
) loop
9895 Act_Subp
:= Node
(Act_Elmt
);
9897 -- If we find an abstract primitive of the actual,
9898 -- then we need to test whether it corresponds to the
9899 -- subprogram from which the generic formal primitive
9902 if Is_Abstract_Subprogram
(Act_Subp
) then
9903 Anc_Subp
:= Alias
(Gen_Subp
);
9905 -- Test whether we have a corresponding primitive
9906 -- by comparing names, kinds, formal types, and
9909 if Chars
(Anc_Subp
) = Chars
(Act_Subp
)
9910 and then Ekind
(Anc_Subp
) = Ekind
(Act_Subp
)
9912 Anc_Formal
:= First_Formal
(Anc_Subp
);
9913 Act_Formal
:= First_Formal
(Act_Subp
);
9914 while Present
(Anc_Formal
)
9915 and then Present
(Act_Formal
)
9917 Anc_F_Type
:= Etype
(Anc_Formal
);
9918 Act_F_Type
:= Etype
(Act_Formal
);
9920 if Ekind
(Anc_F_Type
)
9921 = E_Anonymous_Access_Type
9923 Anc_F_Type
:= Designated_Type
(Anc_F_Type
);
9925 if Ekind
(Act_F_Type
)
9926 = E_Anonymous_Access_Type
9929 Designated_Type
(Act_F_Type
);
9935 Ekind
(Act_F_Type
) = E_Anonymous_Access_Type
9940 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
9941 Act_F_Type
:= Base_Type
(Act_F_Type
);
9943 -- If the formal is controlling, then the
9944 -- the type of the actual primitive's formal
9945 -- must be derived directly or indirectly
9946 -- from the type of the ancestor primitive's
9949 if Is_Controlling_Formal
(Anc_Formal
) then
9950 if not Is_Tagged_Ancestor
9951 (Anc_F_Type
, Act_F_Type
)
9956 -- Otherwise the types of the formals must
9959 elsif Anc_F_Type
/= Act_F_Type
then
9963 Next_Entity
(Anc_Formal
);
9964 Next_Entity
(Act_Formal
);
9967 -- If we traversed through all of the formals
9968 -- then so far the subprograms correspond, so
9969 -- now check that any result types correspond.
9971 if No
(Anc_Formal
) and then No
(Act_Formal
) then
9972 Subprograms_Correspond
:= True;
9974 if Ekind
(Act_Subp
) = E_Function
then
9975 Anc_F_Type
:= Etype
(Anc_Subp
);
9976 Act_F_Type
:= Etype
(Act_Subp
);
9978 if Ekind
(Anc_F_Type
)
9979 = E_Anonymous_Access_Type
9982 Designated_Type
(Anc_F_Type
);
9984 if Ekind
(Act_F_Type
)
9985 = E_Anonymous_Access_Type
9988 Designated_Type
(Act_F_Type
);
9990 Subprograms_Correspond
:= False;
9995 = E_Anonymous_Access_Type
9997 Subprograms_Correspond
:= False;
10000 Anc_F_Type
:= Base_Type
(Anc_F_Type
);
10001 Act_F_Type
:= Base_Type
(Act_F_Type
);
10003 -- Now either the result types must be
10004 -- the same or, if the result type is
10005 -- controlling, the result type of the
10006 -- actual primitive must descend from the
10007 -- result type of the ancestor primitive.
10009 if Subprograms_Correspond
10010 and then Anc_F_Type
/= Act_F_Type
10012 Has_Controlling_Result
(Anc_Subp
)
10014 not Is_Tagged_Ancestor
10015 (Anc_F_Type
, Act_F_Type
)
10017 Subprograms_Correspond
:= False;
10021 -- Found a matching subprogram belonging to
10022 -- formal ancestor type, so actual subprogram
10023 -- corresponds and this violates 3.9.3(9).
10025 if Subprograms_Correspond
then
10027 ("abstract subprogram & overrides " &
10028 "nonabstract subprogram of ancestor",
10036 Next_Elmt
(Act_Elmt
);
10040 Next_Elmt
(Gen_Elmt
);
10042 end Check_Abstract_Primitives
;
10045 -- Verify that limitedness matches. If parent is a limited
10046 -- interface then the generic formal is not unless declared
10047 -- explicitly so. If not declared limited, the actual cannot be
10048 -- limited (see AI05-0087).
10050 -- Even though this AI is a binding interpretation, we enable the
10051 -- check only in Ada 2012 mode, because this improper construct
10052 -- shows up in user code and in existing B-tests.
10054 if Is_Limited_Type
(Act_T
)
10055 and then not Is_Limited_Type
(A_Gen_T
)
10056 and then Ada_Version
>= Ada_2012
10059 ("actual for non-limited & cannot be a limited type", Actual
,
10061 Explain_Limited_Type
(Act_T
, Actual
);
10062 Abandon_Instantiation
(Actual
);
10064 end Validate_Derived_Type_Instance
;
10066 --------------------------------------
10067 -- Validate_Interface_Type_Instance --
10068 --------------------------------------
10070 procedure Validate_Interface_Type_Instance
is
10072 if not Is_Interface
(Act_T
) then
10074 ("actual for formal interface type must be an interface",
10077 elsif Is_Limited_Type
(Act_T
) /= Is_Limited_Type
(A_Gen_T
)
10079 Is_Task_Interface
(A_Gen_T
) /= Is_Task_Interface
(Act_T
)
10081 Is_Protected_Interface
(A_Gen_T
) /=
10082 Is_Protected_Interface
(Act_T
)
10084 Is_Synchronized_Interface
(A_Gen_T
) /=
10085 Is_Synchronized_Interface
(Act_T
)
10088 ("actual for interface& does not match (RM 12.5.5(4))",
10091 end Validate_Interface_Type_Instance
;
10093 ------------------------------------
10094 -- Validate_Private_Type_Instance --
10095 ------------------------------------
10097 procedure Validate_Private_Type_Instance
is
10098 Formal_Discr
: Entity_Id
;
10099 Actual_Discr
: Entity_Id
;
10100 Formal_Subt
: Entity_Id
;
10103 if Is_Limited_Type
(Act_T
)
10104 and then not Is_Limited_Type
(A_Gen_T
)
10107 ("actual for non-limited & cannot be a limited type", Actual
,
10109 Explain_Limited_Type
(Act_T
, Actual
);
10110 Abandon_Instantiation
(Actual
);
10112 elsif Known_To_Have_Preelab_Init
(A_Gen_T
)
10113 and then not Has_Preelaborable_Initialization
(Act_T
)
10116 ("actual for & must have preelaborable initialization", Actual
,
10119 elsif Is_Indefinite_Subtype
(Act_T
)
10120 and then not Is_Indefinite_Subtype
(A_Gen_T
)
10121 and then Ada_Version
>= Ada_95
10124 ("actual for & must be a definite subtype", Actual
, Gen_T
);
10126 elsif not Is_Tagged_Type
(Act_T
)
10127 and then Is_Tagged_Type
(A_Gen_T
)
10130 ("actual for & must be a tagged type", Actual
, Gen_T
);
10132 elsif Has_Discriminants
(A_Gen_T
) then
10133 if not Has_Discriminants
(Act_T
) then
10135 ("actual for & must have discriminants", Actual
, Gen_T
);
10136 Abandon_Instantiation
(Actual
);
10138 elsif Is_Constrained
(Act_T
) then
10140 ("actual for & must be unconstrained", Actual
, Gen_T
);
10141 Abandon_Instantiation
(Actual
);
10144 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
10145 Actual_Discr
:= First_Discriminant
(Act_T
);
10146 while Formal_Discr
/= Empty
loop
10147 if Actual_Discr
= Empty
then
10149 ("discriminants on actual do not match formal",
10151 Abandon_Instantiation
(Actual
);
10154 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
10156 -- Access discriminants match if designated types do
10158 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
10159 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
10160 E_Anonymous_Access_Type
10163 (Designated_Type
(Base_Type
(Formal_Subt
))) =
10164 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
10168 elsif Base_Type
(Formal_Subt
) /=
10169 Base_Type
(Etype
(Actual_Discr
))
10172 ("types of actual discriminants must match formal",
10174 Abandon_Instantiation
(Actual
);
10176 elsif not Subtypes_Statically_Match
10177 (Formal_Subt
, Etype
(Actual_Discr
))
10178 and then Ada_Version
>= Ada_95
10181 ("subtypes of actual discriminants must match formal",
10183 Abandon_Instantiation
(Actual
);
10186 Next_Discriminant
(Formal_Discr
);
10187 Next_Discriminant
(Actual_Discr
);
10190 if Actual_Discr
/= Empty
then
10192 ("discriminants on actual do not match formal",
10194 Abandon_Instantiation
(Actual
);
10201 end Validate_Private_Type_Instance
;
10203 -- Start of processing for Instantiate_Type
10206 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
10207 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
10208 return New_List
(Error
);
10210 elsif not Is_Entity_Name
(Actual
)
10211 or else not Is_Type
(Entity
(Actual
))
10214 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
10215 Abandon_Instantiation
(Actual
);
10218 Act_T
:= Entity
(Actual
);
10220 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
10221 -- as a generic actual parameter if the corresponding formal type
10222 -- does not have a known_discriminant_part, or is a formal derived
10223 -- type that is an Unchecked_Union type.
10225 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
10226 if not Has_Discriminants
(A_Gen_T
)
10228 (Is_Derived_Type
(A_Gen_T
)
10230 Is_Unchecked_Union
(A_Gen_T
))
10234 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
10235 " discriminated formal type", Act_T
);
10240 -- Deal with fixed/floating restrictions
10242 if Is_Floating_Point_Type
(Act_T
) then
10243 Check_Restriction
(No_Floating_Point
, Actual
);
10244 elsif Is_Fixed_Point_Type
(Act_T
) then
10245 Check_Restriction
(No_Fixed_Point
, Actual
);
10248 -- Deal with error of using incomplete type as generic actual.
10249 -- This includes limited views of a type, even if the non-limited
10250 -- view may be available.
10252 if Ekind
(Act_T
) = E_Incomplete_Type
10253 or else (Is_Class_Wide_Type
(Act_T
)
10255 Ekind
(Root_Type
(Act_T
)) = E_Incomplete_Type
)
10257 if Is_Class_Wide_Type
(Act_T
)
10258 or else No
(Full_View
(Act_T
))
10260 Error_Msg_N
("premature use of incomplete type", Actual
);
10261 Abandon_Instantiation
(Actual
);
10263 Act_T
:= Full_View
(Act_T
);
10264 Set_Entity
(Actual
, Act_T
);
10266 if Has_Private_Component
(Act_T
) then
10268 ("premature use of type with private component", Actual
);
10272 -- Deal with error of premature use of private type as generic actual
10274 elsif Is_Private_Type
(Act_T
)
10275 and then Is_Private_Type
(Base_Type
(Act_T
))
10276 and then not Is_Generic_Type
(Act_T
)
10277 and then not Is_Derived_Type
(Act_T
)
10278 and then No
(Full_View
(Root_Type
(Act_T
)))
10280 Error_Msg_N
("premature use of private type", Actual
);
10282 elsif Has_Private_Component
(Act_T
) then
10284 ("premature use of type with private component", Actual
);
10287 Set_Instance_Of
(A_Gen_T
, Act_T
);
10289 -- If the type is generic, the class-wide type may also be used
10291 if Is_Tagged_Type
(A_Gen_T
)
10292 and then Is_Tagged_Type
(Act_T
)
10293 and then not Is_Class_Wide_Type
(A_Gen_T
)
10295 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
10296 Class_Wide_Type
(Act_T
));
10299 if not Is_Abstract_Type
(A_Gen_T
)
10300 and then Is_Abstract_Type
(Act_T
)
10303 ("actual of non-abstract formal cannot be abstract", Actual
);
10306 -- A generic scalar type is a first subtype for which we generate
10307 -- an anonymous base type. Indicate that the instance of this base
10308 -- is the base type of the actual.
10310 if Is_Scalar_Type
(A_Gen_T
) then
10311 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
10315 if Error_Posted
(Act_T
) then
10318 case Nkind
(Def
) is
10319 when N_Formal_Private_Type_Definition
=>
10320 Validate_Private_Type_Instance
;
10322 when N_Formal_Derived_Type_Definition
=>
10323 Validate_Derived_Type_Instance
;
10325 when N_Formal_Discrete_Type_Definition
=>
10326 if not Is_Discrete_Type
(Act_T
) then
10328 ("expect discrete type in instantiation of&",
10330 Abandon_Instantiation
(Actual
);
10333 when N_Formal_Signed_Integer_Type_Definition
=>
10334 if not Is_Signed_Integer_Type
(Act_T
) then
10336 ("expect signed integer type in instantiation of&",
10338 Abandon_Instantiation
(Actual
);
10341 when N_Formal_Modular_Type_Definition
=>
10342 if not Is_Modular_Integer_Type
(Act_T
) then
10344 ("expect modular type in instantiation of &",
10346 Abandon_Instantiation
(Actual
);
10349 when N_Formal_Floating_Point_Definition
=>
10350 if not Is_Floating_Point_Type
(Act_T
) then
10352 ("expect float type in instantiation of &", Actual
, Gen_T
);
10353 Abandon_Instantiation
(Actual
);
10356 when N_Formal_Ordinary_Fixed_Point_Definition
=>
10357 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
10359 ("expect ordinary fixed point type in instantiation of &",
10361 Abandon_Instantiation
(Actual
);
10364 when N_Formal_Decimal_Fixed_Point_Definition
=>
10365 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
10367 ("expect decimal type in instantiation of &",
10369 Abandon_Instantiation
(Actual
);
10372 when N_Array_Type_Definition
=>
10373 Validate_Array_Type_Instance
;
10375 when N_Access_To_Object_Definition
=>
10376 Validate_Access_Type_Instance
;
10378 when N_Access_Function_Definition |
10379 N_Access_Procedure_Definition
=>
10380 Validate_Access_Subprogram_Instance
;
10382 when N_Record_Definition
=>
10383 Validate_Interface_Type_Instance
;
10385 when N_Derived_Type_Definition
=>
10386 Validate_Derived_Interface_Type_Instance
;
10389 raise Program_Error
;
10394 Subt
:= New_Copy
(Gen_T
);
10396 -- Use adjusted sloc of subtype name as the location for other nodes in
10397 -- the subtype declaration.
10399 Loc
:= Sloc
(Subt
);
10402 Make_Subtype_Declaration
(Loc
,
10403 Defining_Identifier
=> Subt
,
10404 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
10406 if Is_Private_Type
(Act_T
) then
10407 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10409 elsif Is_Access_Type
(Act_T
)
10410 and then Is_Private_Type
(Designated_Type
(Act_T
))
10412 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
10415 Decl_Nodes
:= New_List
(Decl_Node
);
10417 -- Flag actual derived types so their elaboration produces the
10418 -- appropriate renamings for the primitive operations of the ancestor.
10419 -- Flag actual for formal private types as well, to determine whether
10420 -- operations in the private part may override inherited operations.
10421 -- If the formal has an interface list, the ancestor is not the
10422 -- parent, but the analyzed formal that includes the interface
10423 -- operations of all its progenitors.
10425 -- Same treatment for formal private types, so we can check whether the
10426 -- type is tagged limited when validating derivations in the private
10427 -- part. (See AI05-096).
10429 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
then
10430 if Present
(Interface_List
(Def
)) then
10431 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
10433 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
10436 elsif Nkind
(Def
) = N_Formal_Private_Type_Definition
then
10437 Set_Generic_Parent_Type
(Decl_Node
, A_Gen_T
);
10440 -- If the actual is a synchronized type that implements an interface,
10441 -- the primitive operations are attached to the corresponding record,
10442 -- and we have to treat it as an additional generic actual, so that its
10443 -- primitive operations become visible in the instance. The task or
10444 -- protected type itself does not carry primitive operations.
10446 if Is_Concurrent_Type
(Act_T
)
10447 and then Is_Tagged_Type
(Act_T
)
10448 and then Present
(Corresponding_Record_Type
(Act_T
))
10449 and then Present
(Ancestor
)
10450 and then Is_Interface
(Ancestor
)
10453 Corr_Rec
: constant Entity_Id
:=
10454 Corresponding_Record_Type
(Act_T
);
10455 New_Corr
: Entity_Id
;
10456 Corr_Decl
: Node_Id
;
10459 New_Corr
:= Make_Temporary
(Loc
, 'S');
10461 Make_Subtype_Declaration
(Loc
,
10462 Defining_Identifier
=> New_Corr
,
10463 Subtype_Indication
=>
10464 New_Reference_To
(Corr_Rec
, Loc
));
10465 Append_To
(Decl_Nodes
, Corr_Decl
);
10467 if Ekind
(Act_T
) = E_Task_Type
then
10468 Set_Ekind
(Subt
, E_Task_Subtype
);
10470 Set_Ekind
(Subt
, E_Protected_Subtype
);
10473 Set_Corresponding_Record_Type
(Subt
, Corr_Rec
);
10474 Set_Generic_Parent_Type
(Corr_Decl
, Ancestor
);
10475 Set_Generic_Parent_Type
(Decl_Node
, Empty
);
10480 end Instantiate_Type
;
10482 ---------------------
10483 -- Is_In_Main_Unit --
10484 ---------------------
10486 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
10487 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
10488 Current_Unit
: Node_Id
;
10491 if Unum
= Main_Unit
then
10494 -- If the current unit is a subunit then it is either the main unit or
10495 -- is being compiled as part of the main unit.
10497 elsif Nkind
(N
) = N_Compilation_Unit
then
10498 return Nkind
(Unit
(N
)) = N_Subunit
;
10501 Current_Unit
:= Parent
(N
);
10502 while Present
(Current_Unit
)
10503 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
10505 Current_Unit
:= Parent
(Current_Unit
);
10508 -- The instantiation node is in the main unit, or else the current node
10509 -- (perhaps as the result of nested instantiations) is in the main unit,
10510 -- or in the declaration of the main unit, which in this last case must
10513 return Unum
= Main_Unit
10514 or else Current_Unit
= Cunit
(Main_Unit
)
10515 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
10516 or else (Present
(Library_Unit
(Current_Unit
))
10517 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
10518 end Is_In_Main_Unit
;
10520 ----------------------------
10521 -- Load_Parent_Of_Generic --
10522 ----------------------------
10524 procedure Load_Parent_Of_Generic
10527 Body_Optional
: Boolean := False)
10529 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
10530 Save_Style_Check
: constant Boolean := Style_Check
;
10531 True_Parent
: Node_Id
;
10532 Inst_Node
: Node_Id
;
10534 Previous_Instances
: constant Elist_Id
:= New_Elmt_List
;
10536 procedure Collect_Previous_Instances
(Decls
: List_Id
);
10537 -- Collect all instantiations in the given list of declarations, that
10538 -- precede the generic that we need to load. If the bodies of these
10539 -- instantiations are available, we must analyze them, to ensure that
10540 -- the public symbols generated are the same when the unit is compiled
10541 -- to generate code, and when it is compiled in the context of a unit
10542 -- that needs a particular nested instance. This process is applied to
10543 -- both package and subprogram instances.
10545 --------------------------------
10546 -- Collect_Previous_Instances --
10547 --------------------------------
10549 procedure Collect_Previous_Instances
(Decls
: List_Id
) is
10553 Decl
:= First
(Decls
);
10554 while Present
(Decl
) loop
10555 if Sloc
(Decl
) >= Sloc
(Inst_Node
) then
10558 -- If Decl is an instantiation, then record it as requiring
10559 -- instantiation of the corresponding body, except if it is an
10560 -- abbreviated instantiation generated internally for conformance
10561 -- checking purposes only for the case of a formal package
10562 -- declared without a box (see Instantiate_Formal_Package). Such
10563 -- an instantiation does not generate any code (the actual code
10564 -- comes from actual) and thus does not need to be analyzed here.
10565 -- If the instantiation appears with a generic package body it is
10566 -- not analyzed here either.
10568 elsif Nkind
(Decl
) = N_Package_Instantiation
10569 and then not Is_Internal
(Defining_Entity
(Decl
))
10571 Append_Elmt
(Decl
, Previous_Instances
);
10573 -- For a subprogram instantiation, omit instantiations intrinsic
10574 -- operations (Unchecked_Conversions, etc.) that have no bodies.
10576 elsif Nkind_In
(Decl
, N_Function_Instantiation
,
10577 N_Procedure_Instantiation
)
10578 and then not Is_Intrinsic_Subprogram
(Entity
(Name
(Decl
)))
10580 Append_Elmt
(Decl
, Previous_Instances
);
10582 elsif Nkind
(Decl
) = N_Package_Declaration
then
10583 Collect_Previous_Instances
10584 (Visible_Declarations
(Specification
(Decl
)));
10585 Collect_Previous_Instances
10586 (Private_Declarations
(Specification
(Decl
)));
10588 -- Previous non-generic bodies may contain instances as well
10590 elsif Nkind
(Decl
) = N_Package_Body
10591 and then Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
10593 Collect_Previous_Instances
(Declarations
(Decl
));
10595 elsif Nkind
(Decl
) = N_Subprogram_Body
10596 and then not Acts_As_Spec
(Decl
)
10597 and then not Is_Generic_Subprogram
(Corresponding_Spec
(Decl
))
10599 Collect_Previous_Instances
(Declarations
(Decl
));
10604 end Collect_Previous_Instances
;
10606 -- Start of processing for Load_Parent_Of_Generic
10609 if not In_Same_Source_Unit
(N
, Spec
)
10610 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
10611 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
10612 and then not Is_In_Main_Unit
(Spec
))
10614 -- Find body of parent of spec, and analyze it. A special case arises
10615 -- when the parent is an instantiation, that is to say when we are
10616 -- currently instantiating a nested generic. In that case, there is
10617 -- no separate file for the body of the enclosing instance. Instead,
10618 -- the enclosing body must be instantiated as if it were a pending
10619 -- instantiation, in order to produce the body for the nested generic
10620 -- we require now. Note that in that case the generic may be defined
10621 -- in a package body, the instance defined in the same package body,
10622 -- and the original enclosing body may not be in the main unit.
10624 Inst_Node
:= Empty
;
10626 True_Parent
:= Parent
(Spec
);
10627 while Present
(True_Parent
)
10628 and then Nkind
(True_Parent
) /= N_Compilation_Unit
10630 if Nkind
(True_Parent
) = N_Package_Declaration
10632 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
10634 -- Parent is a compilation unit that is an instantiation.
10635 -- Instantiation node has been replaced with package decl.
10637 Inst_Node
:= Original_Node
(True_Parent
);
10640 elsif Nkind
(True_Parent
) = N_Package_Declaration
10641 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
10642 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10644 -- Parent is an instantiation within another specification.
10645 -- Declaration for instance has been inserted before original
10646 -- instantiation node. A direct link would be preferable?
10648 Inst_Node
:= Next
(True_Parent
);
10649 while Present
(Inst_Node
)
10650 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
10655 -- If the instance appears within a generic, and the generic
10656 -- unit is defined within a formal package of the enclosing
10657 -- generic, there is no generic body available, and none
10658 -- needed. A more precise test should be used ???
10660 if No
(Inst_Node
) then
10667 True_Parent
:= Parent
(True_Parent
);
10671 -- Case where we are currently instantiating a nested generic
10673 if Present
(Inst_Node
) then
10674 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
10676 -- Instantiation node and declaration of instantiated package
10677 -- were exchanged when only the declaration was needed.
10678 -- Restore instantiation node before proceeding with body.
10680 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
10683 -- Now complete instantiation of enclosing body, if it appears in
10684 -- some other unit. If it appears in the current unit, the body
10685 -- will have been instantiated already.
10687 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
10689 -- We need to determine the expander mode to instantiate the
10690 -- enclosing body. Because the generic body we need may use
10691 -- global entities declared in the enclosing package (including
10692 -- aggregates) it is in general necessary to compile this body
10693 -- with expansion enabled, except if we are within a generic
10694 -- package, in which case the usual generic rule applies.
10697 Exp_Status
: Boolean := True;
10701 -- Loop through scopes looking for generic package
10703 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
10704 while Present
(Scop
)
10705 and then Scop
/= Standard_Standard
10707 if Ekind
(Scop
) = E_Generic_Package
then
10708 Exp_Status
:= False;
10712 Scop
:= Scope
(Scop
);
10715 -- Collect previous instantiations in the unit that contains
10716 -- the desired generic.
10718 if Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
10719 and then not Body_Optional
10723 Info
: Pending_Body_Info
;
10727 Par
:= Parent
(Inst_Node
);
10728 while Present
(Par
) loop
10729 exit when Nkind
(Parent
(Par
)) = N_Compilation_Unit
;
10730 Par
:= Parent
(Par
);
10733 pragma Assert
(Present
(Par
));
10735 if Nkind
(Par
) = N_Package_Body
then
10736 Collect_Previous_Instances
(Declarations
(Par
));
10738 elsif Nkind
(Par
) = N_Package_Declaration
then
10739 Collect_Previous_Instances
10740 (Visible_Declarations
(Specification
(Par
)));
10741 Collect_Previous_Instances
10742 (Private_Declarations
(Specification
(Par
)));
10745 -- Enclosing unit is a subprogram body. In this
10746 -- case all instance bodies are processed in order
10747 -- and there is no need to collect them separately.
10752 Decl
:= First_Elmt
(Previous_Instances
);
10753 while Present
(Decl
) loop
10755 (Inst_Node
=> Node
(Decl
),
10757 Instance_Spec
(Node
(Decl
)),
10758 Expander_Status
=> Exp_Status
,
10759 Current_Sem_Unit
=>
10760 Get_Code_Unit
(Sloc
(Node
(Decl
))),
10761 Scope_Suppress
=> Scope_Suppress
,
10762 Local_Suppress_Stack_Top
=>
10763 Local_Suppress_Stack_Top
,
10764 Version
=> Ada_Version
);
10766 -- Package instance
10769 Nkind
(Node
(Decl
)) = N_Package_Instantiation
10771 Instantiate_Package_Body
10772 (Info
, Body_Optional
=> True);
10774 -- Subprogram instance
10777 -- The instance_spec is the wrapper package,
10778 -- and the subprogram declaration is the last
10779 -- declaration in the wrapper.
10783 (Visible_Declarations
10784 (Specification
(Info
.Act_Decl
)));
10786 Instantiate_Subprogram_Body
10787 (Info
, Body_Optional
=> True);
10795 Instantiate_Package_Body
10797 ((Inst_Node
=> Inst_Node
,
10798 Act_Decl
=> True_Parent
,
10799 Expander_Status
=> Exp_Status
,
10800 Current_Sem_Unit
=>
10801 Get_Code_Unit
(Sloc
(Inst_Node
)),
10802 Scope_Suppress
=> Scope_Suppress
,
10803 Local_Suppress_Stack_Top
=>
10804 Local_Suppress_Stack_Top
,
10805 Version
=> Ada_Version
)),
10806 Body_Optional
=> Body_Optional
);
10810 -- Case where we are not instantiating a nested generic
10813 Opt
.Style_Check
:= False;
10814 Expander_Mode_Save_And_Set
(True);
10815 Load_Needed_Body
(Comp_Unit
, OK
);
10816 Opt
.Style_Check
:= Save_Style_Check
;
10817 Expander_Mode_Restore
;
10820 and then Unit_Requires_Body
(Defining_Entity
(Spec
))
10821 and then not Body_Optional
10824 Bname
: constant Unit_Name_Type
:=
10825 Get_Body_Name
(Get_Unit_Name
(Unit
(Comp_Unit
)));
10828 -- In CodePeer mode, the missing body may make the analysis
10829 -- incomplete, but we do not treat it as fatal.
10831 if CodePeer_Mode
then
10835 Error_Msg_Unit_1
:= Bname
;
10836 Error_Msg_N
("this instantiation requires$!", N
);
10837 Error_Msg_File_1
:=
10838 Get_File_Name
(Bname
, Subunit
=> False);
10839 Error_Msg_N
("\but file{ was not found!", N
);
10840 raise Unrecoverable_Error
;
10847 -- If loading parent of the generic caused an instantiation circularity,
10848 -- we abandon compilation at this point, because otherwise in some cases
10849 -- we get into trouble with infinite recursions after this point.
10851 if Circularity_Detected
then
10852 raise Unrecoverable_Error
;
10854 end Load_Parent_Of_Generic
;
10856 ---------------------------------
10857 -- Map_Formal_Package_Entities --
10858 ---------------------------------
10860 procedure Map_Formal_Package_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
10865 Set_Instance_Of
(Form
, Act
);
10867 -- Traverse formal and actual package to map the corresponding entities.
10868 -- We skip over internal entities that may be generated during semantic
10869 -- analysis, and find the matching entities by name, given that they
10870 -- must appear in the same order.
10872 E1
:= First_Entity
(Form
);
10873 E2
:= First_Entity
(Act
);
10874 while Present
(E1
) and then E1
/= First_Private_Entity
(Form
) loop
10875 -- Could this test be a single condition???
10876 -- Seems like it could, and isn't FPE (Form) a constant anyway???
10878 if not Is_Internal
(E1
)
10879 and then Present
(Parent
(E1
))
10880 and then not Is_Class_Wide_Type
(E1
)
10881 and then not Is_Internal_Name
(Chars
(E1
))
10883 while Present
(E2
) and then Chars
(E2
) /= Chars
(E1
) loop
10890 Set_Instance_Of
(E1
, E2
);
10892 if Is_Type
(E1
) and then Is_Tagged_Type
(E2
) then
10893 Set_Instance_Of
(Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
10896 if Is_Constrained
(E1
) then
10897 Set_Instance_Of
(Base_Type
(E1
), Base_Type
(E2
));
10900 if Ekind
(E1
) = E_Package
and then No
(Renamed_Object
(E1
)) then
10901 Map_Formal_Package_Entities
(E1
, E2
);
10908 end Map_Formal_Package_Entities
;
10910 -----------------------
10911 -- Move_Freeze_Nodes --
10912 -----------------------
10914 procedure Move_Freeze_Nodes
10915 (Out_Of
: Entity_Id
;
10920 Next_Decl
: Node_Id
;
10921 Next_Node
: Node_Id
:= After
;
10924 function Is_Outer_Type
(T
: Entity_Id
) return Boolean;
10925 -- Check whether entity is declared in a scope external to that of the
10928 -------------------
10929 -- Is_Outer_Type --
10930 -------------------
10932 function Is_Outer_Type
(T
: Entity_Id
) return Boolean is
10933 Scop
: Entity_Id
:= Scope
(T
);
10936 if Scope_Depth
(Scop
) < Scope_Depth
(Out_Of
) then
10940 while Scop
/= Standard_Standard
loop
10941 if Scop
= Out_Of
then
10944 Scop
:= Scope
(Scop
);
10952 -- Start of processing for Move_Freeze_Nodes
10959 -- First remove the freeze nodes that may appear before all other
10963 while Present
(Decl
)
10964 and then Nkind
(Decl
) = N_Freeze_Entity
10965 and then Is_Outer_Type
(Entity
(Decl
))
10967 Decl
:= Remove_Head
(L
);
10968 Insert_After
(Next_Node
, Decl
);
10969 Set_Analyzed
(Decl
, False);
10974 -- Next scan the list of declarations and remove each freeze node that
10975 -- appears ahead of the current node.
10977 while Present
(Decl
) loop
10978 while Present
(Next
(Decl
))
10979 and then Nkind
(Next
(Decl
)) = N_Freeze_Entity
10980 and then Is_Outer_Type
(Entity
(Next
(Decl
)))
10982 Next_Decl
:= Remove_Next
(Decl
);
10983 Insert_After
(Next_Node
, Next_Decl
);
10984 Set_Analyzed
(Next_Decl
, False);
10985 Next_Node
:= Next_Decl
;
10988 -- If the declaration is a nested package or concurrent type, then
10989 -- recurse. Nested generic packages will have been processed from the
10992 case Nkind
(Decl
) is
10993 when N_Package_Declaration
=>
10994 Spec
:= Specification
(Decl
);
10996 when N_Task_Type_Declaration
=>
10997 Spec
:= Task_Definition
(Decl
);
10999 when N_Protected_Type_Declaration
=>
11000 Spec
:= Protected_Definition
(Decl
);
11006 if Present
(Spec
) then
11007 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Visible_Declarations
(Spec
));
11008 Move_Freeze_Nodes
(Out_Of
, Next_Node
, Private_Declarations
(Spec
));
11013 end Move_Freeze_Nodes
;
11019 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
is
11021 return Generic_Renamings
.Table
(E
).Next_In_HTable
;
11024 ------------------------
11025 -- Preanalyze_Actuals --
11026 ------------------------
11028 procedure Preanalyze_Actuals
(N
: Node_Id
) is
11031 Errs
: constant Int
:= Serious_Errors_Detected
;
11033 Cur
: Entity_Id
:= Empty
;
11034 -- Current homograph of the instance name
11037 -- Saved visibility status of the current homograph
11040 Assoc
:= First
(Generic_Associations
(N
));
11042 -- If the instance is a child unit, its name may hide an outer homonym,
11043 -- so make it invisible to perform name resolution on the actuals.
11045 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
11047 (Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
))))
11049 Cur
:= Current_Entity
(Defining_Identifier
(Defining_Unit_Name
(N
)));
11051 if Is_Compilation_Unit
(Cur
) then
11052 Vis
:= Is_Immediately_Visible
(Cur
);
11053 Set_Is_Immediately_Visible
(Cur
, False);
11059 while Present
(Assoc
) loop
11060 if Nkind
(Assoc
) /= N_Others_Choice
then
11061 Act
:= Explicit_Generic_Actual_Parameter
(Assoc
);
11063 -- Within a nested instantiation, a defaulted actual is an empty
11064 -- association, so nothing to analyze. If the subprogram actual
11065 -- is an attribute, analyze prefix only, because actual is not a
11066 -- complete attribute reference.
11068 -- If actual is an allocator, analyze expression only. The full
11069 -- analysis can generate code, and if instance is a compilation
11070 -- unit we have to wait until the package instance is installed
11071 -- to have a proper place to insert this code.
11073 -- String literals may be operators, but at this point we do not
11074 -- know whether the actual is a formal subprogram or a string.
11079 elsif Nkind
(Act
) = N_Attribute_Reference
then
11080 Analyze
(Prefix
(Act
));
11082 elsif Nkind
(Act
) = N_Explicit_Dereference
then
11083 Analyze
(Prefix
(Act
));
11085 elsif Nkind
(Act
) = N_Allocator
then
11087 Expr
: constant Node_Id
:= Expression
(Act
);
11090 if Nkind
(Expr
) = N_Subtype_Indication
then
11091 Analyze
(Subtype_Mark
(Expr
));
11093 -- Analyze separately each discriminant constraint, when
11094 -- given with a named association.
11100 Constr
:= First
(Constraints
(Constraint
(Expr
)));
11101 while Present
(Constr
) loop
11102 if Nkind
(Constr
) = N_Discriminant_Association
then
11103 Analyze
(Expression
(Constr
));
11117 elsif Nkind
(Act
) /= N_Operator_Symbol
then
11121 if Errs
/= Serious_Errors_Detected
then
11123 -- Do a minimal analysis of the generic, to prevent spurious
11124 -- warnings complaining about the generic being unreferenced,
11125 -- before abandoning the instantiation.
11127 Analyze
(Name
(N
));
11129 if Is_Entity_Name
(Name
(N
))
11130 and then Etype
(Name
(N
)) /= Any_Type
11132 Generate_Reference
(Entity
(Name
(N
)), Name
(N
));
11133 Set_Is_Instantiated
(Entity
(Name
(N
)));
11136 if Present
(Cur
) then
11138 -- For the case of a child instance hiding an outer homonym,
11139 -- provide additional warning which might explain the error.
11141 Set_Is_Immediately_Visible
(Cur
, Vis
);
11142 Error_Msg_NE
("& hides outer unit with the same name?",
11143 N
, Defining_Unit_Name
(N
));
11146 Abandon_Instantiation
(Act
);
11153 if Present
(Cur
) then
11154 Set_Is_Immediately_Visible
(Cur
, Vis
);
11156 end Preanalyze_Actuals
;
11158 -------------------
11159 -- Remove_Parent --
11160 -------------------
11162 procedure Remove_Parent
(In_Body
: Boolean := False) is
11163 S
: Entity_Id
:= Current_Scope
;
11164 -- S is the scope containing the instantiation just completed. The scope
11165 -- stack contains the parent instances of the instantiation, followed by
11174 -- After child instantiation is complete, remove from scope stack the
11175 -- extra copy of the current scope, and then remove parent instances.
11177 if not In_Body
then
11180 while Current_Scope
/= S
loop
11181 P
:= Current_Scope
;
11182 End_Package_Scope
(Current_Scope
);
11184 if In_Open_Scopes
(P
) then
11185 E
:= First_Entity
(P
);
11186 while Present
(E
) loop
11187 Set_Is_Immediately_Visible
(E
, True);
11191 -- If instantiation is declared in a block, it is the enclosing
11192 -- scope that might be a parent instance. Note that only one
11193 -- block can be involved, because the parent instances have
11194 -- been installed within it.
11196 if Ekind
(P
) = E_Block
then
11197 Cur_P
:= Scope
(P
);
11202 if Is_Generic_Instance
(Cur_P
) and then P
/= Current_Scope
then
11203 -- We are within an instance of some sibling. Retain
11204 -- visibility of parent, for proper subsequent cleanup, and
11205 -- reinstall private declarations as well.
11207 Set_In_Private_Part
(P
);
11208 Install_Private_Declarations
(P
);
11211 -- If the ultimate parent is a top-level unit recorded in
11212 -- Instance_Parent_Unit, then reset its visibility to what it was
11213 -- before instantiation. (It's not clear what the purpose is of
11214 -- testing whether Scope (P) is In_Open_Scopes, but that test was
11215 -- present before the ultimate parent test was added.???)
11217 elsif not In_Open_Scopes
(Scope
(P
))
11218 or else (P
= Instance_Parent_Unit
11219 and then not Parent_Unit_Visible
)
11221 Set_Is_Immediately_Visible
(P
, False);
11223 -- If the current scope is itself an instantiation of a generic
11224 -- nested within P, and we are in the private part of body of this
11225 -- instantiation, restore the full views of P, that were removed
11226 -- in End_Package_Scope above. This obscure case can occur when a
11227 -- subunit of a generic contains an instance of a child unit of
11228 -- its generic parent unit.
11230 elsif S
= Current_Scope
and then Is_Generic_Instance
(S
) then
11232 Par
: constant Entity_Id
:=
11234 (Specification
(Unit_Declaration_Node
(S
)));
11237 and then P
= Scope
(Par
)
11238 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
11240 Set_In_Private_Part
(P
);
11241 Install_Private_Declarations
(P
);
11247 -- Reset visibility of entities in the enclosing scope
11249 Set_Is_Hidden_Open_Scope
(Current_Scope
, False);
11251 Hidden
:= First_Elmt
(Hidden_Entities
);
11252 while Present
(Hidden
) loop
11253 Set_Is_Immediately_Visible
(Node
(Hidden
), True);
11254 Next_Elmt
(Hidden
);
11258 -- Each body is analyzed separately, and there is no context that
11259 -- needs preserving from one body instance to the next, so remove all
11260 -- parent scopes that have been installed.
11262 while Present
(S
) loop
11263 End_Package_Scope
(S
);
11264 Set_Is_Immediately_Visible
(S
, False);
11265 S
:= Current_Scope
;
11266 exit when S
= Standard_Standard
;
11275 procedure Restore_Env
is
11276 Saved
: Instance_Env
renames Instance_Envs
.Table
(Instance_Envs
.Last
);
11279 if No
(Current_Instantiated_Parent
.Act_Id
) then
11280 -- Restore environment after subprogram inlining
11282 Restore_Private_Views
(Empty
);
11285 Current_Instantiated_Parent
:= Saved
.Instantiated_Parent
;
11286 Exchanged_Views
:= Saved
.Exchanged_Views
;
11287 Hidden_Entities
:= Saved
.Hidden_Entities
;
11288 Current_Sem_Unit
:= Saved
.Current_Sem_Unit
;
11289 Parent_Unit_Visible
:= Saved
.Parent_Unit_Visible
;
11290 Instance_Parent_Unit
:= Saved
.Instance_Parent_Unit
;
11292 Restore_Opt_Config_Switches
(Saved
.Switches
);
11294 Instance_Envs
.Decrement_Last
;
11297 ---------------------------
11298 -- Restore_Private_Views --
11299 ---------------------------
11301 procedure Restore_Private_Views
11302 (Pack_Id
: Entity_Id
;
11303 Is_Package
: Boolean := True)
11308 Dep_Elmt
: Elmt_Id
;
11311 procedure Restore_Nested_Formal
(Formal
: Entity_Id
);
11312 -- Hide the generic formals of formal packages declared with box which
11313 -- were reachable in the current instantiation.
11315 ---------------------------
11316 -- Restore_Nested_Formal --
11317 ---------------------------
11319 procedure Restore_Nested_Formal
(Formal
: Entity_Id
) is
11323 if Present
(Renamed_Object
(Formal
))
11324 and then Denotes_Formal_Package
(Renamed_Object
(Formal
), True)
11328 elsif Present
(Associated_Formal_Package
(Formal
)) then
11329 Ent
:= First_Entity
(Formal
);
11330 while Present
(Ent
) loop
11331 exit when Ekind
(Ent
) = E_Package
11332 and then Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
11334 Set_Is_Hidden
(Ent
);
11335 Set_Is_Potentially_Use_Visible
(Ent
, False);
11337 -- If package, then recurse
11339 if Ekind
(Ent
) = E_Package
then
11340 Restore_Nested_Formal
(Ent
);
11346 end Restore_Nested_Formal
;
11348 -- Start of processing for Restore_Private_Views
11351 M
:= First_Elmt
(Exchanged_Views
);
11352 while Present
(M
) loop
11355 -- Subtypes of types whose views have been exchanged, and that are
11356 -- defined within the instance, were not on the Private_Dependents
11357 -- list on entry to the instance, so they have to be exchanged
11358 -- explicitly now, in order to remain consistent with the view of the
11361 if Ekind_In
(Typ
, E_Private_Type
,
11362 E_Limited_Private_Type
,
11363 E_Record_Type_With_Private
)
11365 Dep_Elmt
:= First_Elmt
(Private_Dependents
(Typ
));
11366 while Present
(Dep_Elmt
) loop
11367 Dep_Typ
:= Node
(Dep_Elmt
);
11369 if Scope
(Dep_Typ
) = Pack_Id
11370 and then Present
(Full_View
(Dep_Typ
))
11372 Replace_Elmt
(Dep_Elmt
, Full_View
(Dep_Typ
));
11373 Exchange_Declarations
(Dep_Typ
);
11376 Next_Elmt
(Dep_Elmt
);
11380 Exchange_Declarations
(Node
(M
));
11384 if No
(Pack_Id
) then
11388 -- Make the generic formal parameters private, and make the formal types
11389 -- into subtypes of the actuals again.
11391 E
:= First_Entity
(Pack_Id
);
11392 while Present
(E
) loop
11393 Set_Is_Hidden
(E
, True);
11396 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
11398 Set_Is_Generic_Actual_Type
(E
, False);
11400 -- An unusual case of aliasing: the actual may also be directly
11401 -- visible in the generic, and be private there, while it is fully
11402 -- visible in the context of the instance. The internal subtype
11403 -- is private in the instance but has full visibility like its
11404 -- parent in the enclosing scope. This enforces the invariant that
11405 -- the privacy status of all private dependents of a type coincide
11406 -- with that of the parent type. This can only happen when a
11407 -- generic child unit is instantiated within a sibling.
11409 if Is_Private_Type
(E
)
11410 and then not Is_Private_Type
(Etype
(E
))
11412 Exchange_Declarations
(E
);
11415 elsif Ekind
(E
) = E_Package
then
11417 -- The end of the renaming list is the renaming of the generic
11418 -- package itself. If the instance is a subprogram, all entities
11419 -- in the corresponding package are renamings. If this entity is
11420 -- a formal package, make its own formals private as well. The
11421 -- actual in this case is itself the renaming of an instantiation.
11422 -- If the entity is not a package renaming, it is the entity
11423 -- created to validate formal package actuals: ignore it.
11425 -- If the actual is itself a formal package for the enclosing
11426 -- generic, or the actual for such a formal package, it remains
11427 -- visible on exit from the instance, and therefore nothing needs
11428 -- to be done either, except to keep it accessible.
11430 if Is_Package
and then Renamed_Object
(E
) = Pack_Id
then
11433 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
11437 Denotes_Formal_Package
(Renamed_Object
(E
), True, Pack_Id
)
11439 Set_Is_Hidden
(E
, False);
11443 Act_P
: constant Entity_Id
:= Renamed_Object
(E
);
11447 Id
:= First_Entity
(Act_P
);
11449 and then Id
/= First_Private_Entity
(Act_P
)
11451 exit when Ekind
(Id
) = E_Package
11452 and then Renamed_Object
(Id
) = Act_P
;
11454 Set_Is_Hidden
(Id
, True);
11455 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(Act_P
));
11457 if Ekind
(Id
) = E_Package
then
11458 Restore_Nested_Formal
(Id
);
11469 end Restore_Private_Views
;
11476 (Gen_Unit
: Entity_Id
;
11477 Act_Unit
: Entity_Id
)
11481 Set_Instance_Env
(Gen_Unit
, Act_Unit
);
11484 ----------------------------
11485 -- Save_Global_References --
11486 ----------------------------
11488 procedure Save_Global_References
(N
: Node_Id
) is
11489 Gen_Scope
: Entity_Id
;
11493 function Is_Global
(E
: Entity_Id
) return Boolean;
11494 -- Check whether entity is defined outside of generic unit. Examine the
11495 -- scope of an entity, and the scope of the scope, etc, until we find
11496 -- either Standard, in which case the entity is global, or the generic
11497 -- unit itself, which indicates that the entity is local. If the entity
11498 -- is the generic unit itself, as in the case of a recursive call, or
11499 -- the enclosing generic unit, if different from the current scope, then
11500 -- it is local as well, because it will be replaced at the point of
11501 -- instantiation. On the other hand, if it is a reference to a child
11502 -- unit of a common ancestor, which appears in an instantiation, it is
11503 -- global because it is used to denote a specific compilation unit at
11504 -- the time the instantiations will be analyzed.
11506 procedure Reset_Entity
(N
: Node_Id
);
11507 -- Save semantic information on global entity so that it is not resolved
11508 -- again at instantiation time.
11510 procedure Save_Entity_Descendants
(N
: Node_Id
);
11511 -- Apply Save_Global_References to the two syntactic descendants of
11512 -- non-terminal nodes that carry an Associated_Node and are processed
11513 -- through Reset_Entity. Once the global entity (if any) has been
11514 -- captured together with its type, only two syntactic descendants need
11515 -- to be traversed to complete the processing of the tree rooted at N.
11516 -- This applies to Selected_Components, Expanded_Names, and to Operator
11517 -- nodes. N can also be a character literal, identifier, or operator
11518 -- symbol node, but the call has no effect in these cases.
11520 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
);
11521 -- Default actuals in nested instances must be handled specially
11522 -- because there is no link to them from the original tree. When an
11523 -- actual subprogram is given by a default, we add an explicit generic
11524 -- association for it in the instantiation node. When we save the
11525 -- global references on the name of the instance, we recover the list
11526 -- of generic associations, and add an explicit one to the original
11527 -- generic tree, through which a global actual can be preserved.
11528 -- Similarly, if a child unit is instantiated within a sibling, in the
11529 -- context of the parent, we must preserve the identifier of the parent
11530 -- so that it can be properly resolved in a subsequent instantiation.
11532 procedure Save_Global_Descendant
(D
: Union_Id
);
11533 -- Apply Save_Global_References recursively to the descendents of the
11536 procedure Save_References
(N
: Node_Id
);
11537 -- This is the recursive procedure that does the work, once the
11538 -- enclosing generic scope has been established.
11544 function Is_Global
(E
: Entity_Id
) return Boolean is
11547 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean;
11548 -- Determine whether the parent node of a reference to a child unit
11549 -- denotes an instantiation or a formal package, in which case the
11550 -- reference to the child unit is global, even if it appears within
11551 -- the current scope (e.g. when the instance appears within the body
11552 -- of an ancestor).
11554 ----------------------
11555 -- Is_Instance_Node --
11556 ----------------------
11558 function Is_Instance_Node
(Decl
: Node_Id
) return Boolean is
11560 return Nkind
(Decl
) in N_Generic_Instantiation
11562 Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
;
11563 end Is_Instance_Node
;
11565 -- Start of processing for Is_Global
11568 if E
= Gen_Scope
then
11571 elsif E
= Standard_Standard
then
11574 elsif Is_Child_Unit
(E
)
11575 and then (Is_Instance_Node
(Parent
(N2
))
11576 or else (Nkind
(Parent
(N2
)) = N_Expanded_Name
11577 and then N2
= Selector_Name
(Parent
(N2
))
11579 Is_Instance_Node
(Parent
(Parent
(N2
)))))
11585 while Se
/= Gen_Scope
loop
11586 if Se
= Standard_Standard
then
11601 procedure Reset_Entity
(N
: Node_Id
) is
11603 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
);
11604 -- If the type of N2 is global to the generic unit. Save the type in
11605 -- the generic node.
11606 -- What does this comment mean???
11608 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
;
11609 -- Find the ultimate ancestor of the current unit. If it is not a
11610 -- generic unit, then the name of the current unit in the prefix of
11611 -- an expanded name must be replaced with its generic homonym to
11612 -- ensure that it will be properly resolved in an instance.
11614 ---------------------
11615 -- Set_Global_Type --
11616 ---------------------
11618 procedure Set_Global_Type
(N
: Node_Id
; N2
: Node_Id
) is
11619 Typ
: constant Entity_Id
:= Etype
(N2
);
11622 Set_Etype
(N
, Typ
);
11624 if Entity
(N
) /= N2
11625 and then Has_Private_View
(Entity
(N
))
11627 -- If the entity of N is not the associated node, this is a
11628 -- nested generic and it has an associated node as well, whose
11629 -- type is already the full view (see below). Indicate that the
11630 -- original node has a private view.
11632 Set_Has_Private_View
(N
);
11635 -- If not a private type, nothing else to do
11637 if not Is_Private_Type
(Typ
) then
11638 if Is_Array_Type
(Typ
)
11639 and then Is_Private_Type
(Component_Type
(Typ
))
11641 Set_Has_Private_View
(N
);
11644 -- If it is a derivation of a private type in a context where no
11645 -- full view is needed, nothing to do either.
11647 elsif No
(Full_View
(Typ
)) and then Typ
/= Etype
(Typ
) then
11650 -- Otherwise mark the type for flipping and use the full view when
11654 Set_Has_Private_View
(N
);
11656 if Present
(Full_View
(Typ
)) then
11657 Set_Etype
(N2
, Full_View
(Typ
));
11660 end Set_Global_Type
;
11666 function Top_Ancestor
(E
: Entity_Id
) return Entity_Id
is
11671 while Is_Child_Unit
(Par
) loop
11672 Par
:= Scope
(Par
);
11678 -- Start of processing for Reset_Entity
11681 N2
:= Get_Associated_Node
(N
);
11684 -- If the entity is an itype created as a subtype of an access type
11685 -- with a null exclusion restore source entity for proper visibility.
11686 -- The itype will be created anew in the instance.
11688 if Present
(E
) then
11690 and then Ekind
(E
) = E_Access_Subtype
11691 and then Is_Entity_Name
(N
)
11692 and then Chars
(Etype
(E
)) = Chars
(N
)
11695 Set_Entity
(N2
, E
);
11699 if Is_Global
(E
) then
11700 Set_Global_Type
(N
, N2
);
11702 elsif Nkind
(N
) = N_Op_Concat
11703 and then Is_Generic_Type
(Etype
(N2
))
11704 and then (Base_Type
(Etype
(Right_Opnd
(N2
))) = Etype
(N2
)
11706 Base_Type
(Etype
(Left_Opnd
(N2
))) = Etype
(N2
))
11707 and then Is_Intrinsic_Subprogram
(E
)
11712 -- Entity is local. Mark generic node as unresolved.
11713 -- Note that now it does not have an entity.
11715 Set_Associated_Node
(N
, Empty
);
11716 Set_Etype
(N
, Empty
);
11719 if Nkind
(Parent
(N
)) in N_Generic_Instantiation
11720 and then N
= Name
(Parent
(N
))
11722 Save_Global_Defaults
(Parent
(N
), Parent
(N2
));
11725 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11726 and then Nkind
(Parent
(N2
)) = N_Expanded_Name
11728 if Is_Global
(Entity
(Parent
(N2
))) then
11729 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11730 Set_Associated_Node
(Parent
(N
), Parent
(N2
));
11731 Set_Global_Type
(Parent
(N
), Parent
(N2
));
11732 Save_Entity_Descendants
(N
);
11734 -- If this is a reference to the current generic entity, replace
11735 -- by the name of the generic homonym of the current package. This
11736 -- is because in an instantiation Par.P.Q will not resolve to the
11737 -- name of the instance, whose enclosing scope is not necessarily
11738 -- Par. We use the generic homonym rather that the name of the
11739 -- generic itself because it may be hidden by a local declaration.
11741 elsif In_Open_Scopes
(Entity
(Parent
(N2
)))
11743 Is_Generic_Unit
(Top_Ancestor
(Entity
(Prefix
(Parent
(N2
)))))
11745 if Ekind
(Entity
(Parent
(N2
))) = E_Generic_Package
then
11746 Rewrite
(Parent
(N
),
11747 Make_Identifier
(Sloc
(N
),
11749 Chars
(Generic_Homonym
(Entity
(Parent
(N2
))))));
11751 Rewrite
(Parent
(N
),
11752 Make_Identifier
(Sloc
(N
),
11753 Chars
=> Chars
(Selector_Name
(Parent
(N2
)))));
11757 if Nkind
(Parent
(Parent
(N
))) in N_Generic_Instantiation
11758 and then Parent
(N
) = Name
(Parent
(Parent
(N
)))
11760 Save_Global_Defaults
11761 (Parent
(Parent
(N
)), Parent
(Parent
((N2
))));
11764 -- A selected component may denote a static constant that has been
11765 -- folded. If the static constant is global to the generic, capture
11766 -- its value. Otherwise the folding will happen in any instantiation.
11768 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11769 and then Nkind_In
(Parent
(N2
), N_Integer_Literal
, N_Real_Literal
)
11771 if Present
(Entity
(Original_Node
(Parent
(N2
))))
11772 and then Is_Global
(Entity
(Original_Node
(Parent
(N2
))))
11774 Rewrite
(Parent
(N
), New_Copy
(Parent
(N2
)));
11775 Set_Analyzed
(Parent
(N
), False);
11781 -- A selected component may be transformed into a parameterless
11782 -- function call. If the called entity is global, rewrite the node
11783 -- appropriately, i.e. as an extended name for the global entity.
11785 elsif Nkind
(Parent
(N
)) = N_Selected_Component
11786 and then Nkind
(Parent
(N2
)) = N_Function_Call
11787 and then N
= Selector_Name
(Parent
(N
))
11789 if No
(Parameter_Associations
(Parent
(N2
))) then
11790 if Is_Global
(Entity
(Name
(Parent
(N2
)))) then
11791 Change_Selected_Component_To_Expanded_Name
(Parent
(N
));
11792 Set_Associated_Node
(Parent
(N
), Name
(Parent
(N2
)));
11793 Set_Global_Type
(Parent
(N
), Name
(Parent
(N2
)));
11794 Save_Entity_Descendants
(N
);
11797 Set_Associated_Node
(N
, Empty
);
11798 Set_Etype
(N
, Empty
);
11801 -- In Ada 2005, X.F may be a call to a primitive operation,
11802 -- rewritten as F (X). This rewriting will be done again in an
11803 -- instance, so keep the original node. Global entities will be
11804 -- captured as for other constructs.
11810 -- Entity is local. Reset in generic unit, so that node is resolved
11811 -- anew at the point of instantiation.
11814 Set_Associated_Node
(N
, Empty
);
11815 Set_Etype
(N
, Empty
);
11819 -----------------------------
11820 -- Save_Entity_Descendants --
11821 -----------------------------
11823 procedure Save_Entity_Descendants
(N
: Node_Id
) is
11826 when N_Binary_Op
=>
11827 Save_Global_Descendant
(Union_Id
(Left_Opnd
(N
)));
11828 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11831 Save_Global_Descendant
(Union_Id
(Right_Opnd
(N
)));
11833 when N_Expanded_Name | N_Selected_Component
=>
11834 Save_Global_Descendant
(Union_Id
(Prefix
(N
)));
11835 Save_Global_Descendant
(Union_Id
(Selector_Name
(N
)));
11837 when N_Identifier | N_Character_Literal | N_Operator_Symbol
=>
11841 raise Program_Error
;
11843 end Save_Entity_Descendants
;
11845 --------------------------
11846 -- Save_Global_Defaults --
11847 --------------------------
11849 procedure Save_Global_Defaults
(N1
, N2
: Node_Id
) is
11850 Loc
: constant Source_Ptr
:= Sloc
(N1
);
11851 Assoc2
: constant List_Id
:= Generic_Associations
(N2
);
11852 Gen_Id
: constant Entity_Id
:= Get_Generic_Entity
(N2
);
11859 Actual
: Entity_Id
;
11862 Assoc1
:= Generic_Associations
(N1
);
11864 if Present
(Assoc1
) then
11865 Act1
:= First
(Assoc1
);
11868 Set_Generic_Associations
(N1
, New_List
);
11869 Assoc1
:= Generic_Associations
(N1
);
11872 if Present
(Assoc2
) then
11873 Act2
:= First
(Assoc2
);
11878 while Present
(Act1
) and then Present
(Act2
) loop
11883 -- Find the associations added for default subprograms
11885 if Present
(Act2
) then
11886 while Nkind
(Act2
) /= N_Generic_Association
11887 or else No
(Entity
(Selector_Name
(Act2
)))
11888 or else not Is_Overloadable
(Entity
(Selector_Name
(Act2
)))
11893 -- Add a similar association if the default is global. The
11894 -- renaming declaration for the actual has been analyzed, and
11895 -- its alias is the program it renames. Link the actual in the
11896 -- original generic tree with the node in the analyzed tree.
11898 while Present
(Act2
) loop
11899 Subp
:= Entity
(Selector_Name
(Act2
));
11900 Def
:= Explicit_Generic_Actual_Parameter
(Act2
);
11902 -- Following test is defence against rubbish errors
11904 if No
(Alias
(Subp
)) then
11908 -- Retrieve the resolved actual from the renaming declaration
11909 -- created for the instantiated formal.
11911 Actual
:= Entity
(Name
(Parent
(Parent
(Subp
))));
11912 Set_Entity
(Def
, Actual
);
11913 Set_Etype
(Def
, Etype
(Actual
));
11915 if Is_Global
(Actual
) then
11917 Make_Generic_Association
(Loc
,
11918 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11919 Explicit_Generic_Actual_Parameter
=>
11920 New_Occurrence_Of
(Actual
, Loc
));
11922 Set_Associated_Node
11923 (Explicit_Generic_Actual_Parameter
(Ndec
), Def
);
11925 Append
(Ndec
, Assoc1
);
11927 -- If there are other defaults, add a dummy association in case
11928 -- there are other defaulted formals with the same name.
11930 elsif Present
(Next
(Act2
)) then
11932 Make_Generic_Association
(Loc
,
11933 Selector_Name
=> New_Occurrence_Of
(Subp
, Loc
),
11934 Explicit_Generic_Actual_Parameter
=> Empty
);
11936 Append
(Ndec
, Assoc1
);
11943 if Nkind
(Name
(N1
)) = N_Identifier
11944 and then Is_Child_Unit
(Gen_Id
)
11945 and then Is_Global
(Gen_Id
)
11946 and then Is_Generic_Unit
(Scope
(Gen_Id
))
11947 and then In_Open_Scopes
(Scope
(Gen_Id
))
11949 -- This is an instantiation of a child unit within a sibling, so
11950 -- that the generic parent is in scope. An eventual instance must
11951 -- occur within the scope of an instance of the parent. Make name
11952 -- in instance into an expanded name, to preserve the identifier
11953 -- of the parent, so it can be resolved subsequently.
11955 Rewrite
(Name
(N2
),
11956 Make_Expanded_Name
(Loc
,
11957 Chars
=> Chars
(Gen_Id
),
11958 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11959 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11960 Set_Entity
(Name
(N2
), Gen_Id
);
11962 Rewrite
(Name
(N1
),
11963 Make_Expanded_Name
(Loc
,
11964 Chars
=> Chars
(Gen_Id
),
11965 Prefix
=> New_Occurrence_Of
(Scope
(Gen_Id
), Loc
),
11966 Selector_Name
=> New_Occurrence_Of
(Gen_Id
, Loc
)));
11968 Set_Associated_Node
(Name
(N1
), Name
(N2
));
11969 Set_Associated_Node
(Prefix
(Name
(N1
)), Empty
);
11970 Set_Associated_Node
11971 (Selector_Name
(Name
(N1
)), Selector_Name
(Name
(N2
)));
11972 Set_Etype
(Name
(N1
), Etype
(Gen_Id
));
11975 end Save_Global_Defaults
;
11977 ----------------------------
11978 -- Save_Global_Descendant --
11979 ----------------------------
11981 procedure Save_Global_Descendant
(D
: Union_Id
) is
11985 if D
in Node_Range
then
11986 if D
= Union_Id
(Empty
) then
11989 elsif Nkind
(Node_Id
(D
)) /= N_Compilation_Unit
then
11990 Save_References
(Node_Id
(D
));
11993 elsif D
in List_Range
then
11994 if D
= Union_Id
(No_List
)
11995 or else Is_Empty_List
(List_Id
(D
))
12000 N1
:= First
(List_Id
(D
));
12001 while Present
(N1
) loop
12002 Save_References
(N1
);
12007 -- Element list or other non-node field, nothing to do
12012 end Save_Global_Descendant
;
12014 ---------------------
12015 -- Save_References --
12016 ---------------------
12018 -- This is the recursive procedure that does the work once the enclosing
12019 -- generic scope has been established. We have to treat specially a
12020 -- number of node rewritings that are required by semantic processing
12021 -- and which change the kind of nodes in the generic copy: typically
12022 -- constant-folding, replacing an operator node by a string literal, or
12023 -- a selected component by an expanded name. In each of those cases, the
12024 -- transformation is propagated to the generic unit.
12026 procedure Save_References
(N
: Node_Id
) is
12027 Loc
: constant Source_Ptr
:= Sloc
(N
);
12033 elsif Nkind_In
(N
, N_Character_Literal
, N_Operator_Symbol
) then
12034 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
12037 elsif Nkind
(N
) = N_Operator_Symbol
12038 and then Nkind
(Get_Associated_Node
(N
)) = N_String_Literal
12040 Change_Operator_Symbol_To_String_Literal
(N
);
12043 elsif Nkind
(N
) in N_Op
then
12044 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
12045 if Nkind
(N
) = N_Op_Concat
then
12046 Set_Is_Component_Left_Opnd
(N
,
12047 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
12049 Set_Is_Component_Right_Opnd
(N
,
12050 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
12056 -- Node may be transformed into call to a user-defined operator
12058 N2
:= Get_Associated_Node
(N
);
12060 if Nkind
(N2
) = N_Function_Call
then
12061 E
:= Entity
(Name
(N2
));
12064 and then Is_Global
(E
)
12066 Set_Etype
(N
, Etype
(N2
));
12068 Set_Associated_Node
(N
, Empty
);
12069 Set_Etype
(N
, Empty
);
12072 elsif Nkind_In
(N2
, N_Integer_Literal
,
12076 if Present
(Original_Node
(N2
))
12077 and then Nkind
(Original_Node
(N2
)) = Nkind
(N
)
12080 -- Operation was constant-folded. Whenever possible,
12081 -- recover semantic information from unfolded node,
12084 Set_Associated_Node
(N
, Original_Node
(N2
));
12086 if Nkind
(N
) = N_Op_Concat
then
12087 Set_Is_Component_Left_Opnd
(N
,
12088 Is_Component_Left_Opnd
(Get_Associated_Node
(N
)));
12089 Set_Is_Component_Right_Opnd
(N
,
12090 Is_Component_Right_Opnd
(Get_Associated_Node
(N
)));
12096 -- If original node is already modified, propagate
12097 -- constant-folding to template.
12099 Rewrite
(N
, New_Copy
(N2
));
12100 Set_Analyzed
(N
, False);
12103 elsif Nkind
(N2
) = N_Identifier
12104 and then Ekind
(Entity
(N2
)) = E_Enumeration_Literal
12106 -- Same if call was folded into a literal, but in this case
12107 -- retain the entity to avoid spurious ambiguities if it is
12108 -- overloaded at the point of instantiation or inlining.
12110 Rewrite
(N
, New_Copy
(N2
));
12111 Set_Analyzed
(N
, False);
12115 -- Complete operands check if node has not been constant-folded
12117 if Nkind
(N
) in N_Op
then
12118 Save_Entity_Descendants
(N
);
12121 elsif Nkind
(N
) = N_Identifier
then
12122 if Nkind
(N
) = Nkind
(Get_Associated_Node
(N
)) then
12124 -- If this is a discriminant reference, always save it. It is
12125 -- used in the instance to find the corresponding discriminant
12126 -- positionally rather than by name.
12128 Set_Original_Discriminant
12129 (N
, Original_Discriminant
(Get_Associated_Node
(N
)));
12133 N2
:= Get_Associated_Node
(N
);
12135 if Nkind
(N2
) = N_Function_Call
then
12136 E
:= Entity
(Name
(N2
));
12138 -- Name resolves to a call to parameterless function. If
12139 -- original entity is global, mark node as resolved.
12142 and then Is_Global
(E
)
12144 Set_Etype
(N
, Etype
(N2
));
12146 Set_Associated_Node
(N
, Empty
);
12147 Set_Etype
(N
, Empty
);
12150 elsif Nkind_In
(N2
, N_Integer_Literal
, N_Real_Literal
)
12151 and then Is_Entity_Name
(Original_Node
(N2
))
12153 -- Name resolves to named number that is constant-folded,
12154 -- We must preserve the original name for ASIS use, and
12155 -- undo the constant-folding, which will be repeated in
12158 Set_Associated_Node
(N
, Original_Node
(N2
));
12161 elsif Nkind
(N2
) = N_String_Literal
then
12163 -- Name resolves to string literal. Perform the same
12164 -- replacement in generic.
12166 Rewrite
(N
, New_Copy
(N2
));
12168 elsif Nkind
(N2
) = N_Explicit_Dereference
then
12170 -- An identifier is rewritten as a dereference if it is the
12171 -- prefix in an implicit dereference (call or attribute).
12172 -- The analysis of an instantiation will expand the node
12173 -- again, so we preserve the original tree but link it to
12174 -- the resolved entity in case it is global.
12176 if Is_Entity_Name
(Prefix
(N2
))
12177 and then Present
(Entity
(Prefix
(N2
)))
12178 and then Is_Global
(Entity
(Prefix
(N2
)))
12180 Set_Associated_Node
(N
, Prefix
(N2
));
12182 elsif Nkind
(Prefix
(N2
)) = N_Function_Call
12183 and then Is_Global
(Entity
(Name
(Prefix
(N2
))))
12186 Make_Explicit_Dereference
(Loc
,
12187 Prefix
=> Make_Function_Call
(Loc
,
12189 New_Occurrence_Of
(Entity
(Name
(Prefix
(N2
))),
12193 Set_Associated_Node
(N
, Empty
);
12194 Set_Etype
(N
, Empty
);
12197 -- The subtype mark of a nominally unconstrained object is
12198 -- rewritten as a subtype indication using the bounds of the
12199 -- expression. Recover the original subtype mark.
12201 elsif Nkind
(N2
) = N_Subtype_Indication
12202 and then Is_Entity_Name
(Original_Node
(N2
))
12204 Set_Associated_Node
(N
, Original_Node
(N2
));
12212 elsif Nkind
(N
) in N_Entity
then
12217 Qual
: Node_Id
:= Empty
;
12218 Typ
: Entity_Id
:= Empty
;
12221 use Atree
.Unchecked_Access
;
12222 -- This code section is part of implementing an untyped tree
12223 -- traversal, so it needs direct access to node fields.
12226 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
12227 N2
:= Get_Associated_Node
(N
);
12234 -- In an instance within a generic, use the name of the
12235 -- actual and not the original generic parameter. If the
12236 -- actual is global in the current generic it must be
12237 -- preserved for its instantiation.
12239 if Nkind
(Parent
(Typ
)) = N_Subtype_Declaration
12241 Present
(Generic_Parent_Type
(Parent
(Typ
)))
12243 Typ
:= Base_Type
(Typ
);
12244 Set_Etype
(N2
, Typ
);
12250 or else not Is_Global
(Typ
)
12252 Set_Associated_Node
(N
, Empty
);
12254 -- If the aggregate is an actual in a call, it has been
12255 -- resolved in the current context, to some local type.
12256 -- The enclosing call may have been disambiguated by the
12257 -- aggregate, and this disambiguation might fail at
12258 -- instantiation time because the type to which the
12259 -- aggregate did resolve is not preserved. In order to
12260 -- preserve some of this information, we wrap the
12261 -- aggregate in a qualified expression, using the id of
12262 -- its type. For further disambiguation we qualify the
12263 -- type name with its scope (if visible) because both
12264 -- id's will have corresponding entities in an instance.
12265 -- This resolves most of the problems with missing type
12266 -- information on aggregates in instances.
12268 if Nkind
(N2
) = Nkind
(N
)
12270 Nkind_In
(Parent
(N2
), N_Procedure_Call_Statement
,
12272 and then Comes_From_Source
(Typ
)
12274 if Is_Immediately_Visible
(Scope
(Typ
)) then
12275 Nam
:= Make_Selected_Component
(Loc
,
12277 Make_Identifier
(Loc
, Chars
(Scope
(Typ
))),
12279 Make_Identifier
(Loc
, Chars
(Typ
)));
12281 Nam
:= Make_Identifier
(Loc
, Chars
(Typ
));
12285 Make_Qualified_Expression
(Loc
,
12286 Subtype_Mark
=> Nam
,
12287 Expression
=> Relocate_Node
(N
));
12291 Save_Global_Descendant
(Field1
(N
));
12292 Save_Global_Descendant
(Field2
(N
));
12293 Save_Global_Descendant
(Field3
(N
));
12294 Save_Global_Descendant
(Field5
(N
));
12296 if Present
(Qual
) then
12300 -- All other cases than aggregates
12303 -- For pragmas, we propagate the Enabled status for the
12304 -- relevant pragmas to the original generic tree. This was
12305 -- originally needed for SCO generation. It is no longer
12306 -- needed there (since we use the Sloc value in calls to
12307 -- Set_SCO_Pragma_Enabled), but it seems a generally good
12308 -- idea to have this flag set properly.
12310 if Nkind
(N
) = N_Pragma
12312 (Pragma_Name
(N
) = Name_Assert
or else
12313 Pragma_Name
(N
) = Name_Check
or else
12314 Pragma_Name
(N
) = Name_Precondition
or else
12315 Pragma_Name
(N
) = Name_Postcondition
)
12316 and then Present
(Associated_Node
(Pragma_Identifier
(N
)))
12318 Set_Pragma_Enabled
(N
,
12320 (Parent
(Associated_Node
(Pragma_Identifier
(N
)))));
12323 Save_Global_Descendant
(Field1
(N
));
12324 Save_Global_Descendant
(Field2
(N
));
12325 Save_Global_Descendant
(Field3
(N
));
12326 Save_Global_Descendant
(Field4
(N
));
12327 Save_Global_Descendant
(Field5
(N
));
12331 end Save_References
;
12333 -- Start of processing for Save_Global_References
12336 Gen_Scope
:= Current_Scope
;
12338 -- If the generic unit is a child unit, references to entities in the
12339 -- parent are treated as local, because they will be resolved anew in
12340 -- the context of the instance of the parent.
12342 while Is_Child_Unit
(Gen_Scope
)
12343 and then Ekind
(Scope
(Gen_Scope
)) = E_Generic_Package
12345 Gen_Scope
:= Scope
(Gen_Scope
);
12348 Save_References
(N
);
12349 end Save_Global_References
;
12351 --------------------------------------
12352 -- Set_Copied_Sloc_For_Inlined_Body --
12353 --------------------------------------
12355 procedure Set_Copied_Sloc_For_Inlined_Body
(N
: Node_Id
; E
: Entity_Id
) is
12357 Create_Instantiation_Source
(N
, E
, True, S_Adjustment
);
12358 end Set_Copied_Sloc_For_Inlined_Body
;
12360 ---------------------
12361 -- Set_Instance_Of --
12362 ---------------------
12364 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
) is
12366 Generic_Renamings
.Table
(Generic_Renamings
.Last
) := (A
, B
, Assoc_Null
);
12367 Generic_Renamings_HTable
.Set
(Generic_Renamings
.Last
);
12368 Generic_Renamings
.Increment_Last
;
12369 end Set_Instance_Of
;
12371 --------------------
12372 -- Set_Next_Assoc --
12373 --------------------
12375 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
) is
12377 Generic_Renamings
.Table
(E
).Next_In_HTable
:= Next
;
12378 end Set_Next_Assoc
;
12380 -------------------
12381 -- Start_Generic --
12382 -------------------
12384 procedure Start_Generic
is
12386 -- ??? More things could be factored out in this routine.
12387 -- Should probably be done at a later stage.
12389 Generic_Flags
.Append
(Inside_A_Generic
);
12390 Inside_A_Generic
:= True;
12392 Expander_Mode_Save_And_Set
(False);
12395 ----------------------
12396 -- Set_Instance_Env --
12397 ----------------------
12399 procedure Set_Instance_Env
12400 (Gen_Unit
: Entity_Id
;
12401 Act_Unit
: Entity_Id
)
12404 -- Regardless of the current mode, predefined units are analyzed in the
12405 -- most current Ada mode, and earlier version Ada checks do not apply
12406 -- to predefined units. Nothing needs to be done for non-internal units.
12407 -- These are always analyzed in the current mode.
12409 if Is_Internal_File_Name
12410 (Fname
=> Unit_File_Name
(Get_Source_Unit
(Gen_Unit
)),
12411 Renamings_Included
=> True)
12413 Set_Opt_Config_Switches
(True, Current_Sem_Unit
= Main_Unit
);
12416 Current_Instantiated_Parent
:=
12417 (Gen_Id
=> Gen_Unit
,
12418 Act_Id
=> Act_Unit
,
12419 Next_In_HTable
=> Assoc_Null
);
12420 end Set_Instance_Env
;
12426 procedure Switch_View
(T
: Entity_Id
) is
12427 BT
: constant Entity_Id
:= Base_Type
(T
);
12428 Priv_Elmt
: Elmt_Id
:= No_Elmt
;
12429 Priv_Sub
: Entity_Id
;
12432 -- T may be private but its base type may have been exchanged through
12433 -- some other occurrence, in which case there is nothing to switch
12434 -- besides T itself. Note that a private dependent subtype of a private
12435 -- type might not have been switched even if the base type has been,
12436 -- because of the last branch of Check_Private_View (see comment there).
12438 if not Is_Private_Type
(BT
) then
12439 Prepend_Elmt
(Full_View
(T
), Exchanged_Views
);
12440 Exchange_Declarations
(T
);
12444 Priv_Elmt
:= First_Elmt
(Private_Dependents
(BT
));
12446 if Present
(Full_View
(BT
)) then
12447 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
12448 Exchange_Declarations
(BT
);
12451 while Present
(Priv_Elmt
) loop
12452 Priv_Sub
:= (Node
(Priv_Elmt
));
12454 -- We avoid flipping the subtype if the Etype of its full view is
12455 -- private because this would result in a malformed subtype. This
12456 -- occurs when the Etype of the subtype full view is the full view of
12457 -- the base type (and since the base types were just switched, the
12458 -- subtype is pointing to the wrong view). This is currently the case
12459 -- for tagged record types, access types (maybe more?) and needs to
12460 -- be resolved. ???
12462 if Present
(Full_View
(Priv_Sub
))
12463 and then not Is_Private_Type
(Etype
(Full_View
(Priv_Sub
)))
12465 Prepend_Elmt
(Full_View
(Priv_Sub
), Exchanged_Views
);
12466 Exchange_Declarations
(Priv_Sub
);
12469 Next_Elmt
(Priv_Elmt
);
12473 -----------------------------
12474 -- Valid_Default_Attribute --
12475 -----------------------------
12477 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
) is
12478 Attr_Id
: constant Attribute_Id
:=
12479 Get_Attribute_Id
(Attribute_Name
(Def
));
12480 T
: constant Entity_Id
:= Entity
(Prefix
(Def
));
12481 Is_Fun
: constant Boolean := (Ekind
(Nam
) = E_Function
);
12494 F
:= First_Formal
(Nam
);
12495 while Present
(F
) loop
12496 Num_F
:= Num_F
+ 1;
12501 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
12502 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
12503 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
12504 Attribute_Unbiased_Rounding
=>
12507 and then Is_Floating_Point_Type
(T
);
12509 when Attribute_Image | Attribute_Pred | Attribute_Succ |
12510 Attribute_Value | Attribute_Wide_Image |
12511 Attribute_Wide_Value
=>
12512 OK
:= (Is_Fun
and then Num_F
= 1 and then Is_Scalar_Type
(T
));
12514 when Attribute_Max | Attribute_Min
=>
12515 OK
:= (Is_Fun
and then Num_F
= 2 and then Is_Scalar_Type
(T
));
12517 when Attribute_Input
=>
12518 OK
:= (Is_Fun
and then Num_F
= 1);
12520 when Attribute_Output | Attribute_Read | Attribute_Write
=>
12521 OK
:= (not Is_Fun
and then Num_F
= 2);
12528 Error_Msg_N
("attribute reference has wrong profile for subprogram",
12531 end Valid_Default_Attribute
;