1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
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 Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Rident
; use Rident
;
44 with Restrict
; use Restrict
;
45 with Rtsfind
; use Rtsfind
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch7
; use Sem_Ch7
;
51 with Sem_Ch8
; use Sem_Ch8
;
52 with Sem_Ch10
; use Sem_Ch10
;
53 with Sem_Ch13
; use Sem_Ch13
;
54 with Sem_Elab
; use Sem_Elab
;
55 with Sem_Elim
; use Sem_Elim
;
56 with Sem_Eval
; use Sem_Eval
;
57 with Sem_Res
; use Sem_Res
;
58 with Sem_Type
; use Sem_Type
;
59 with Sem_Util
; use Sem_Util
;
60 with Sem_Warn
; use Sem_Warn
;
61 with Stand
; use Stand
;
62 with Sinfo
; use Sinfo
;
63 with Sinfo
.CN
; use Sinfo
.CN
;
64 with Sinput
; use Sinput
;
65 with Sinput
.L
; use Sinput
.L
;
66 with Snames
; use Snames
;
67 with Stringt
; use Stringt
;
68 with Uname
; use Uname
;
70 with Tbuild
; use Tbuild
;
71 with Uintp
; use Uintp
;
72 with Urealp
; use Urealp
;
76 package body Sem_Ch12
is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected
: Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation
(N
: Node_Id
);
245 pragma No_Return
(Abandon_Instantiation
);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T
: in out Entity_Id
;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T
: Entity_Id
; Def
: Node_Id
);
268 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
269 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
270 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
271 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T
: Entity_Id
; Def
: Node_Id
);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
283 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
284 -- This needs comments ???
286 function Analyze_Associations
289 F_Copy
: List_Id
) return List_Id
;
290 -- At instantiation time, build the list of associations between formals
291 -- and actuals. Each association becomes a renaming declaration for the
292 -- formal entity. F_Copy is the analyzed list of formals in the generic
293 -- copy. It is used to apply legality checks to the actuals. I_Node is the
294 -- instantiation node itself.
296 procedure Analyze_Subprogram_Instantiation
300 procedure Build_Instance_Compilation_Unit_Nodes
304 -- This procedure is used in the case where the generic instance of a
305 -- subprogram body or package body is a library unit. In this case, the
306 -- original library unit node for the generic instantiation must be
307 -- replaced by the resulting generic body, and a link made to a new
308 -- compilation unit node for the generic declaration. The argument N is
309 -- the original generic instantiation. Act_Body and Act_Decl are the body
310 -- and declaration of the instance (either package body and declaration
311 -- nodes or subprogram body and declaration nodes depending on the case).
312 -- On return, the node N has been rewritten with the actual body.
314 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
315 -- Apply the following to all formal packages in generic associations.
317 procedure Check_Formal_Package_Instance
318 (Formal_Pack
: Entity_Id
;
319 Actual_Pack
: Entity_Id
);
320 -- Verify that the actuals of the actual instance match the actuals of
321 -- the template for a formal package that is not declared with a box.
323 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
324 -- If the generic is a local entity and the corresponding body has not
325 -- been seen yet, flag enclosing packages to indicate that it will be
326 -- elaborated after the generic body. Subprograms declared in the same
327 -- package cannot be inlined by the front-end because front-end inlining
328 -- requires a strict linear order of elaboration.
330 procedure Check_Hidden_Child_Unit
332 Gen_Unit
: Entity_Id
;
333 Act_Decl_Id
: Entity_Id
);
334 -- If the generic unit is an implicit child instance within a parent
335 -- instance, we need to make an explicit test that it is not hidden by
336 -- a child instance of the same name and parent.
338 procedure Check_Private_View
(N
: Node_Id
);
339 -- Check whether the type of a generic entity has a different view between
340 -- the point of generic analysis and the point of instantiation. If the
341 -- view has changed, then at the point of instantiation we restore the
342 -- correct view to perform semantic analysis of the instance, and reset
343 -- the current view after instantiation. The processing is driven by the
344 -- current private status of the type of the node, and Has_Private_View,
345 -- a flag that is set at the point of generic compilation. If view and
346 -- flag are inconsistent then the type is updated appropriately.
348 procedure Check_Generic_Actuals
349 (Instance
: Entity_Id
;
350 Is_Formal_Box
: Boolean);
351 -- Similar to previous one. Check the actuals in the instantiation,
352 -- whose views can change between the point of instantiation and the point
353 -- of instantiation of the body. In addition, mark the generic renamings
354 -- as generic actuals, so that they are not compatible with other actuals.
355 -- Recurse on an actual that is a formal package whose declaration has
358 function Contains_Instance_Of
361 N
: Node_Id
) return Boolean;
362 -- Inner is instantiated within the generic Outer. Check whether Inner
363 -- directly or indirectly contains an instance of Outer or of one of its
364 -- parents, in the case of a subunit. Each generic unit holds a list of
365 -- the entities instantiated within (at any depth). This procedure
366 -- determines whether the set of such lists contains a cycle, i.e. an
367 -- illegal circular instantiation.
369 function Denotes_Formal_Package
371 On_Exit
: Boolean := False) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. If such
374 -- a package is used as a formal in an nested generic, or as an actual
375 -- in a nested instantiation, the visibility of ITS formals should not
376 -- be modified. When called from within Restore_Private_Views, the flag
377 -- On_Exit is true, to indicate that the search for a possible enclosing
378 -- instance should ignore the current one.
380 function Find_Actual_Type
382 Gen_Scope
: Entity_Id
) return Entity_Id
;
383 -- When validating the actual types of a child instance, check whether
384 -- the formal is a formal type of the parent unit, and retrieve the current
385 -- actual for it. Typ is the entity in the analyzed formal type declaration
386 -- (component or index type of an array type) and Gen_Scope is the scope of
387 -- the analyzed formal array type.
389 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
;
390 -- Given the entity of a unit that is an instantiation, retrieve the
391 -- original instance node. This is used when loading the instantiations
392 -- of the ancestors of a child generic that is being instantiated.
394 function In_Same_Declarative_Part
396 Inst
: Node_Id
) return Boolean;
397 -- True if the instantiation Inst and the given freeze_node F_Node appear
398 -- within the same declarative part, ignoring subunits, but with no inter-
399 -- vening suprograms or concurrent units. If true, the freeze node
400 -- of the instance can be placed after the freeze node of the parent,
401 -- which it itself an instance.
403 procedure Set_Instance_Env
404 (Gen_Unit
: Entity_Id
;
405 Act_Unit
: Entity_Id
);
406 -- Save current instance on saved environment, to be used to determine
407 -- the global status of entities in nested instances. Part of Save_Env.
408 -- called after verifying that the generic unit is legal for the instance.
410 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
411 -- Associate analyzed generic parameter with corresponding
412 -- instance. Used for semantic checks at instantiation time.
414 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
415 -- Traverse the Exchanged_Views list to see if a type was private
416 -- and has already been flipped during this phase of instantiation.
418 procedure Hide_Current_Scope
;
419 -- When compiling a generic child unit, the parent context must be
420 -- present, but the instance and all entities that may be generated
421 -- must be inserted in the current scope. We leave the current scope
422 -- on the stack, but make its entities invisible to avoid visibility
423 -- problems. This is reversed at the end of instantiations. This is
424 -- not done for the instantiation of the bodies, which only require the
425 -- instances of the generic parents to be in scope.
427 procedure Install_Body
432 -- If the instantiation happens textually before the body of the generic,
433 -- the instantiation of the body must be analyzed after the generic body,
434 -- and not at the point of instantiation. Such early instantiations can
435 -- happen if the generic and the instance appear in a package declaration
436 -- because the generic body can only appear in the corresponding package
437 -- body. Early instantiations can also appear if generic, instance and
438 -- body are all in the declarative part of a subprogram or entry. Entities
439 -- of packages that are early instantiations are delayed, and their freeze
440 -- node appears after the generic body.
442 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
443 -- Insert freeze node at the end of the declarative part that includes the
444 -- instance node N. If N is in the visible part of an enclosing package
445 -- declaration, the freeze node has to be inserted at the end of the
446 -- private declarations, if any.
448 procedure Freeze_Subprogram_Body
449 (Inst_Node
: Node_Id
;
451 Pack_Id
: Entity_Id
);
452 -- The generic body may appear textually after the instance, including
453 -- in the proper body of a stub, or within a different package instance.
454 -- Given that the instance can only be elaborated after the generic, we
455 -- place freeze_nodes for the instance and/or for packages that may enclose
456 -- the instance and the generic, so that the back-end can establish the
457 -- proper order of elaboration.
460 -- Establish environment for subsequent instantiation. Separated from
461 -- Save_Env because data-structures for visibility handling must be
462 -- initialized before call to Check_Generic_Child_Unit.
464 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
465 -- When compiling an instance of a child unit the parent (which is
466 -- itself an instance) is an enclosing scope that must be made
467 -- immediately visible. This procedure is also used to install the non-
468 -- generic parent of a generic child unit when compiling its body, so that
469 -- full views of types in the parent are made visible.
471 procedure Remove_Parent
(In_Body
: Boolean := False);
472 -- Reverse effect after instantiation of child is complete.
474 procedure Inline_Instance_Body
476 Gen_Unit
: Entity_Id
;
478 -- If front-end inlining is requested, instantiate the package body,
479 -- and preserve the visibility of its compilation unit, to insure
480 -- that successive instantiations succeed.
482 -- The functions Instantiate_XXX perform various legality checks and build
483 -- the declarations for instantiated generic parameters.
484 -- Need to describe what the parameters are ???
486 function Instantiate_Object
489 Analyzed_Formal
: Node_Id
) return List_Id
;
491 function Instantiate_Type
494 Analyzed_Formal
: Node_Id
;
495 Actual_Decls
: List_Id
) return Node_Id
;
497 function Instantiate_Formal_Subprogram
500 Analyzed_Formal
: Node_Id
) return Node_Id
;
502 function Instantiate_Formal_Package
505 Analyzed_Formal
: Node_Id
) return List_Id
;
506 -- If the formal package is declared with a box, special visibility rules
507 -- apply to its formals: they are in the visible part of the package. This
508 -- is true in the declarative region of the formal package, that is to say
509 -- in the enclosing generic or instantiation. For an instantiation, the
510 -- parameters of the formal package are made visible in an explicit step.
511 -- Furthermore, if the actual is a visible use_clause, these formals must
512 -- be made potentially use_visible as well. On exit from the enclosing
513 -- instantiation, the reverse must be done.
515 -- For a formal package declared without a box, there are conformance rules
516 -- that apply to the actuals in the generic declaration and the actuals of
517 -- the actual package in the enclosing instantiation. The simplest way to
518 -- apply these rules is to repeat the instantiation of the formal package
519 -- in the context of the enclosing instance, and compare the generic
520 -- associations of this instantiation with those of the actual package.
522 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
523 -- Test if given node is in the main unit
525 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
);
526 -- If the generic appears in a separate non-generic library unit,
527 -- load the corresponding body to retrieve the body of the generic.
528 -- N is the node for the generic instantiation, Spec is the generic
529 -- package declaration.
531 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
532 -- Add the context clause of the unit containing a generic unit to
533 -- an instantiation that is a compilation unit.
535 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
536 -- In order to propagate semantic information back from the analyzed
537 -- copy to the original generic, we maintain links between selected nodes
538 -- in the generic and their corresponding copies. At the end of generic
539 -- analysis, the routine Save_Global_References traverses the generic
540 -- tree, examines the semantic information, and preserves the links to
541 -- those nodes that contain global information. At instantiation, the
542 -- information from the associated node is placed on the new copy, so
543 -- that name resolution is not repeated.
545 -- Three kinds of source nodes have associated nodes:
547 -- a) those that can reference (denote) entities, that is identifiers,
548 -- character literals, expanded_names, operator symbols, operators,
549 -- and attribute reference nodes. These nodes have an Entity field
550 -- and are the set of nodes that are in N_Has_Entity.
552 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
554 -- c) selected components (N_Selected_Component)
556 -- For the first class, the associated node preserves the entity if it is
557 -- global. If the generic contains nested instantiations, the associated
558 -- node itself has been recopied, and a chain of them must be followed.
560 -- For aggregates, the associated node allows retrieval of the type, which
561 -- may otherwise not appear in the generic. The view of this type may be
562 -- different between generic and instantiation, and the full view can be
563 -- installed before the instantiation is analyzed. For aggregates of
564 -- type extensions, the same view exchange may have to be performed for
565 -- some of the ancestor types, if their view is private at the point of
568 -- Nodes that are selected components in the parse tree may be rewritten
569 -- as expanded names after resolution, and must be treated as potential
570 -- entity holders. which is why they also have an Associated_Node.
572 -- Nodes that do not come from source, such as freeze nodes, do not appear
573 -- in the generic tree, and need not have an associated node.
575 -- The associated node is stored in the Associated_Node field. Note that
576 -- this field overlaps Entity, which is fine, because the whole point is
577 -- that we don't need or want the normal Entity field in this situation.
579 procedure Move_Freeze_Nodes
583 -- Freeze nodes can be generated in the analysis of a generic unit, but
584 -- will not be seen by the back-end. It is necessary to move those nodes
585 -- to the enclosing scope if they freeze an outer entity. We place them
586 -- at the end of the enclosing generic package, which is semantically
589 procedure Pre_Analyze_Actuals
(N
: Node_Id
);
590 -- Analyze actuals to perform name resolution. Full resolution is done
591 -- later, when the expected types are known, but names have to be captured
592 -- before installing parents of generics, that are not visible for the
593 -- actuals themselves.
595 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
596 -- Verify that an attribute that appears as the default for a formal
597 -- subprogram is a function or procedure with the correct profile.
599 -------------------------------------------
600 -- Data Structures for Generic Renamings --
601 -------------------------------------------
603 -- The map Generic_Renamings associates generic entities with their
604 -- corresponding actuals. Currently used to validate type instances.
605 -- It will eventually be used for all generic parameters to eliminate
606 -- the need for overload resolution in the instance.
608 type Assoc_Ptr
is new Int
;
610 Assoc_Null
: constant Assoc_Ptr
:= -1;
615 Next_In_HTable
: Assoc_Ptr
;
618 package Generic_Renamings
is new Table
.Table
619 (Table_Component_Type
=> Assoc
,
620 Table_Index_Type
=> Assoc_Ptr
,
621 Table_Low_Bound
=> 0,
623 Table_Increment
=> 100,
624 Table_Name
=> "Generic_Renamings");
626 -- Variable to hold enclosing instantiation. When the environment is
627 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
629 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
631 -- Hash table for associations
633 HTable_Size
: constant := 37;
634 type HTable_Range
is range 0 .. HTable_Size
- 1;
636 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
637 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
638 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
639 function Hash
(F
: Entity_Id
) return HTable_Range
;
641 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
642 Header_Num
=> HTable_Range
,
644 Elmt_Ptr
=> Assoc_Ptr
,
645 Null_Ptr
=> Assoc_Null
,
646 Set_Next
=> Set_Next_Assoc
,
649 Get_Key
=> Get_Gen_Id
,
653 Exchanged_Views
: Elist_Id
;
654 -- This list holds the private views that have been exchanged during
655 -- instantiation to restore the visibility of the generic declaration.
656 -- (see comments above). After instantiation, the current visibility is
657 -- reestablished by means of a traversal of this list.
659 Hidden_Entities
: Elist_Id
;
660 -- This list holds the entities of the current scope that are removed
661 -- from immediate visibility when instantiating a child unit. Their
662 -- visibility is restored in Remove_Parent.
664 -- Because instantiations can be recursive, the following must be saved
665 -- on entry and restored on exit from an instantiation (spec or body).
666 -- This is done by the two procedures Save_Env and Restore_Env. For
667 -- package and subprogram instantiations (but not for the body instances)
668 -- the action of Save_Env is done in two steps: Init_Env is called before
669 -- Check_Generic_Child_Unit, because setting the parent instances requires
670 -- that the visibility data structures be properly initialized. Once the
671 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
673 type Instance_Env
is record
674 Ada_Version
: Ada_Version_Type
;
675 Instantiated_Parent
: Assoc
;
676 Exchanged_Views
: Elist_Id
;
677 Hidden_Entities
: Elist_Id
;
678 Current_Sem_Unit
: Unit_Number_Type
;
681 package Instance_Envs
is new Table
.Table
(
682 Table_Component_Type
=> Instance_Env
,
683 Table_Index_Type
=> Int
,
684 Table_Low_Bound
=> 0,
686 Table_Increment
=> 100,
687 Table_Name
=> "Instance_Envs");
689 procedure Restore_Private_Views
690 (Pack_Id
: Entity_Id
;
691 Is_Package
: Boolean := True);
692 -- Restore the private views of external types, and unmark the generic
693 -- renamings of actuals, so that they become comptible subtypes again.
694 -- For subprograms, Pack_Id is the package constructed to hold the
697 procedure Switch_View
(T
: Entity_Id
);
698 -- Switch the partial and full views of a type and its private
699 -- dependents (i.e. its subtypes and derived types).
701 ------------------------------------
702 -- Structures for Error Reporting --
703 ------------------------------------
705 Instantiation_Node
: Node_Id
;
706 -- Used by subprograms that validate instantiation of formal parameters
707 -- where there might be no actual on which to place the error message.
708 -- Also used to locate the instantiation node for generic subunits.
710 Instantiation_Error
: exception;
711 -- When there is a semantic error in the generic parameter matching,
712 -- there is no point in continuing the instantiation, because the
713 -- number of cascaded errors is unpredictable. This exception aborts
714 -- the instantiation process altogether.
716 S_Adjustment
: Sloc_Adjustment
;
717 -- Offset created for each node in an instantiation, in order to keep
718 -- track of the source position of the instantiation in each of its nodes.
719 -- A subsequent semantic error or warning on a construct of the instance
720 -- points to both places: the original generic node, and the point of
721 -- instantiation. See Sinput and Sinput.L for additional details.
723 ------------------------------------------------------------
724 -- Data structure for keeping track when inside a Generic --
725 ------------------------------------------------------------
727 -- The following table is used to save values of the Inside_A_Generic
728 -- flag (see spec of Sem) when they are saved by Start_Generic.
730 package Generic_Flags
is new Table
.Table
(
731 Table_Component_Type
=> Boolean,
732 Table_Index_Type
=> Int
,
733 Table_Low_Bound
=> 0,
735 Table_Increment
=> 200,
736 Table_Name
=> "Generic_Flags");
738 ---------------------------
739 -- Abandon_Instantiation --
740 ---------------------------
742 procedure Abandon_Instantiation
(N
: Node_Id
) is
744 Error_Msg_N
("instantiation abandoned!", N
);
745 raise Instantiation_Error
;
746 end Abandon_Instantiation
;
748 --------------------------
749 -- Analyze_Associations --
750 --------------------------
752 function Analyze_Associations
755 F_Copy
: List_Id
) return List_Id
757 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
758 Assoc
: constant List_Id
:= New_List
;
759 Defaults
: constant Elist_Id
:= New_Elmt_List
;
760 Gen_Unit
: constant Entity_Id
:= Defining_Entity
(Parent
(F_Copy
));
764 Next_Formal
: Node_Id
;
765 Temp_Formal
: Node_Id
;
766 Analyzed_Formal
: Node_Id
;
769 First_Named
: Node_Id
:= Empty
;
770 Found_Assoc
: Node_Id
;
771 Is_Named_Assoc
: Boolean;
772 Num_Matched
: Int
:= 0;
773 Num_Actuals
: Int
:= 0;
775 function Matching_Actual
777 A_F
: Entity_Id
) return Node_Id
;
778 -- Find actual that corresponds to a given a formal parameter. If the
779 -- actuals are positional, return the next one, if any. If the actuals
780 -- are named, scan the parameter associations to find the right one.
781 -- A_F is the corresponding entity in the analyzed generic,which is
782 -- placed on the selector name for ASIS use.
784 procedure Set_Analyzed_Formal
;
785 -- Find the node in the generic copy that corresponds to a given formal.
786 -- The semantic information on this node is used to perform legality
787 -- checks on the actuals. Because semantic analysis can introduce some
788 -- anonymous entities or modify the declaration node itself, the
789 -- correspondence between the two lists is not one-one. In addition to
790 -- anonymous types, the presence a formal equality will introduce an
791 -- implicit declaration for the corresponding inequality.
793 ---------------------
794 -- Matching_Actual --
795 ---------------------
797 function Matching_Actual
799 A_F
: Entity_Id
) return Node_Id
805 Is_Named_Assoc
:= False;
807 -- End of list of purely positional parameters
812 -- Case of positional parameter corresponding to current formal
814 elsif No
(Selector_Name
(Actual
)) then
815 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
816 Found_Assoc
:= Actual
;
817 Num_Matched
:= Num_Matched
+ 1;
820 -- Otherwise scan list of named actuals to find the one with the
821 -- desired name. All remaining actuals have explicit names.
824 Is_Named_Assoc
:= True;
828 while Present
(Actual
) loop
829 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
830 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
831 Set_Entity
(Selector_Name
(Actual
), A_F
);
832 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
833 Generate_Reference
(A_F
, Selector_Name
(Actual
));
834 Found_Assoc
:= Actual
;
835 Num_Matched
:= Num_Matched
+ 1;
843 -- Reset for subsequent searches. In most cases the named
844 -- associations are in order. If they are not, we reorder them
845 -- to avoid scanning twice the same actual. This is not just a
846 -- question of efficiency: there may be multiple defaults with
847 -- boxes that have the same name. In a nested instantiation we
848 -- insert actuals for those defaults, and cannot rely on their
849 -- names to disambiguate them.
851 if Actual
= First_Named
then
854 elsif Present
(Actual
) then
855 Insert_Before
(First_Named
, Remove_Next
(Prev
));
858 Actual
:= First_Named
;
864 -------------------------
865 -- Set_Analyzed_Formal --
866 -------------------------
868 procedure Set_Analyzed_Formal
is
871 while Present
(Analyzed_Formal
) loop
872 Kind
:= Nkind
(Analyzed_Formal
);
874 case Nkind
(Formal
) is
876 when N_Formal_Subprogram_Declaration
=>
877 exit when Kind
= N_Formal_Subprogram_Declaration
880 (Defining_Unit_Name
(Specification
(Formal
))) =
882 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
884 when N_Formal_Package_Declaration
=>
886 Kind
= N_Formal_Package_Declaration
888 Kind
= N_Generic_Package_Declaration
;
890 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
894 -- Skip freeze nodes, and nodes inserted to replace
895 -- unrecognized pragmas.
898 Kind
/= N_Formal_Subprogram_Declaration
899 and then Kind
/= N_Subprogram_Declaration
900 and then Kind
/= N_Freeze_Entity
901 and then Kind
/= N_Null_Statement
902 and then Kind
/= N_Itype_Reference
903 and then Chars
(Defining_Identifier
(Formal
)) =
904 Chars
(Defining_Identifier
(Analyzed_Formal
));
907 Next
(Analyzed_Formal
);
910 end Set_Analyzed_Formal
;
912 -- Start of processing for Analyze_Associations
915 -- If named associations are present, save the first named association
916 -- (it may of course be Empty) to facilitate subsequent name search.
918 Actuals
:= Generic_Associations
(I_Node
);
920 if Present
(Actuals
) then
921 First_Named
:= First
(Actuals
);
923 while Present
(First_Named
)
924 and then No
(Selector_Name
(First_Named
))
926 Num_Actuals
:= Num_Actuals
+ 1;
931 Named
:= First_Named
;
932 while Present
(Named
) loop
933 if No
(Selector_Name
(Named
)) then
934 Error_Msg_N
("invalid positional actual after named one", Named
);
935 Abandon_Instantiation
(Named
);
938 -- A named association may lack an actual parameter, if it was
939 -- introduced for a default subprogram that turns out to be local
940 -- to the outer instantiation.
942 if Present
(Explicit_Generic_Actual_Parameter
(Named
)) then
943 Num_Actuals
:= Num_Actuals
+ 1;
949 if Present
(Formals
) then
950 Formal
:= First_Non_Pragma
(Formals
);
951 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
953 if Present
(Actuals
) then
954 Actual
:= First
(Actuals
);
956 -- All formals should have default values
962 while Present
(Formal
) loop
964 Next_Formal
:= Next_Non_Pragma
(Formal
);
966 case Nkind
(Formal
) is
967 when N_Formal_Object_Declaration
=>
970 Defining_Identifier
(Formal
),
971 Defining_Identifier
(Analyzed_Formal
));
974 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
977 when N_Formal_Type_Declaration
=>
980 Defining_Identifier
(Formal
),
981 Defining_Identifier
(Analyzed_Formal
));
984 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
987 Instantiation_Node
, Defining_Identifier
(Formal
));
988 Error_Msg_NE
("\in instantiation of & declared#",
989 Instantiation_Node
, Gen_Unit
);
990 Abandon_Instantiation
(Instantiation_Node
);
996 (Formal
, Match
, Analyzed_Formal
, Assoc
));
998 -- an instantiation is a freeze point for the actuals,
999 -- unless this is a rewritten formal package.
1001 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1002 Append_Elmt
(Entity
(Match
), Actual_Types
);
1006 -- A remote access-to-class-wide type must not be an
1007 -- actual parameter for a generic formal of an access
1008 -- type (E.2.2 (17)).
1010 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1012 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1013 N_Access_To_Object_Definition
1015 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1018 when N_Formal_Subprogram_Declaration
=>
1021 Defining_Unit_Name
(Specification
(Formal
)),
1022 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1024 -- If the formal subprogram has the same name as
1025 -- another formal subprogram of the generic, then
1026 -- a named association is illegal (12.3(9)). Exclude
1027 -- named associations that are generated for a nested
1031 and then Is_Named_Assoc
1032 and then Comes_From_Source
(Found_Assoc
)
1034 Temp_Formal
:= First
(Formals
);
1035 while Present
(Temp_Formal
) loop
1036 if Nkind
(Temp_Formal
) =
1037 N_Formal_Subprogram_Declaration
1038 and then Temp_Formal
/= Formal
1040 Chars
(Selector_Name
(Found_Assoc
)) =
1041 Chars
(Defining_Unit_Name
1042 (Specification
(Temp_Formal
)))
1045 ("name not allowed for overloaded formal",
1047 Abandon_Instantiation
(Instantiation_Node
);
1055 Instantiate_Formal_Subprogram
1056 (Formal
, Match
, Analyzed_Formal
));
1059 and then Box_Present
(Formal
)
1062 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1066 when N_Formal_Package_Declaration
=>
1069 Defining_Identifier
(Formal
),
1070 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1073 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1076 Instantiation_Node
, Defining_Identifier
(Formal
));
1077 Error_Msg_NE
("\in instantiation of & declared#",
1078 Instantiation_Node
, Gen_Unit
);
1080 Abandon_Instantiation
(Instantiation_Node
);
1085 (Instantiate_Formal_Package
1086 (Formal
, Match
, Analyzed_Formal
),
1090 -- For use type and use package appearing in the context
1091 -- clause, we have already copied them, so we can just
1092 -- move them where they belong (we mustn't recopy them
1093 -- since this would mess up the Sloc values).
1095 when N_Use_Package_Clause |
1096 N_Use_Type_Clause
=>
1098 Append
(Formal
, Assoc
);
1101 raise Program_Error
;
1105 Formal
:= Next_Formal
;
1106 Next_Non_Pragma
(Analyzed_Formal
);
1109 if Num_Actuals
> Num_Matched
then
1110 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1112 if Present
(Selector_Name
(Actual
)) then
1114 ("unmatched actual&",
1115 Actual
, Selector_Name
(Actual
));
1116 Error_Msg_NE
("\in instantiation of& declared#",
1120 ("unmatched actual in instantiation of& declared#",
1125 elsif Present
(Actuals
) then
1127 ("too many actuals in generic instantiation", Instantiation_Node
);
1131 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1134 while Present
(Elmt
) loop
1135 Freeze_Before
(I_Node
, Node
(Elmt
));
1140 -- If there are default subprograms, normalize the tree by adding
1141 -- explicit associations for them. This is required if the instance
1142 -- appears within a generic.
1150 Elmt
:= First_Elmt
(Defaults
);
1151 while Present
(Elmt
) loop
1152 if No
(Actuals
) then
1153 Actuals
:= New_List
;
1154 Set_Generic_Associations
(I_Node
, Actuals
);
1157 Subp
:= Node
(Elmt
);
1159 Make_Generic_Association
(Sloc
(Subp
),
1160 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1161 Explicit_Generic_Actual_Parameter
=>
1162 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1163 Mark_Rewrite_Insertion
(New_D
);
1164 Append_To
(Actuals
, New_D
);
1170 end Analyze_Associations
;
1172 -------------------------------
1173 -- Analyze_Formal_Array_Type --
1174 -------------------------------
1176 procedure Analyze_Formal_Array_Type
1177 (T
: in out Entity_Id
;
1183 -- Treated like a non-generic array declaration, with
1184 -- additional semantic checks.
1188 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1189 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1190 while Present
(DSS
) loop
1191 if Nkind
(DSS
) = N_Subtype_Indication
1192 or else Nkind
(DSS
) = N_Range
1193 or else Nkind
(DSS
) = N_Attribute_Reference
1195 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1202 Array_Type_Declaration
(T
, Def
);
1203 Set_Is_Generic_Type
(Base_Type
(T
));
1205 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1206 and then No
(Full_View
(Component_Type
(T
)))
1208 Error_Msg_N
("premature usage of incomplete type", Def
);
1210 elsif Is_Internal
(Component_Type
(T
))
1211 and then Nkind
(Original_Node
1212 (Subtype_Indication
(Component_Definition
(Def
))))
1213 /= N_Attribute_Reference
1216 ("only a subtype mark is allowed in a formal",
1217 Subtype_Indication
(Component_Definition
(Def
)));
1220 end Analyze_Formal_Array_Type
;
1222 ---------------------------------------------
1223 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1224 ---------------------------------------------
1226 -- As for other generic types, we create a valid type representation
1227 -- with legal but arbitrary attributes, whose values are never considered
1228 -- static. For all scalar types we introduce an anonymous base type, with
1229 -- the same attributes. We choose the corresponding integer type to be
1230 -- Standard_Integer.
1232 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1236 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1237 Base
: constant Entity_Id
:=
1239 (E_Decimal_Fixed_Point_Type
,
1240 Current_Scope
, Sloc
(Def
), 'G');
1241 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1242 Delta_Val
: constant Ureal
:= Ureal_1
;
1243 Digs_Val
: constant Uint
:= Uint_6
;
1248 Set_Etype
(Base
, Base
);
1249 Set_Size_Info
(Base
, Int_Base
);
1250 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1251 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1252 Set_Digits_Value
(Base
, Digs_Val
);
1253 Set_Delta_Value
(Base
, Delta_Val
);
1254 Set_Small_Value
(Base
, Delta_Val
);
1255 Set_Scalar_Range
(Base
,
1257 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1258 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1260 Set_Is_Generic_Type
(Base
);
1261 Set_Parent
(Base
, Parent
(Def
));
1263 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1264 Set_Etype
(T
, Base
);
1265 Set_Size_Info
(T
, Int_Base
);
1266 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1267 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1268 Set_Digits_Value
(T
, Digs_Val
);
1269 Set_Delta_Value
(T
, Delta_Val
);
1270 Set_Small_Value
(T
, Delta_Val
);
1271 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1273 Check_Restriction
(No_Fixed_Point
, Def
);
1274 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1276 ---------------------------------
1277 -- Analyze_Formal_Derived_Type --
1278 ---------------------------------
1280 procedure Analyze_Formal_Derived_Type
1285 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1286 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1290 Set_Is_Generic_Type
(T
);
1292 if Private_Present
(Def
) then
1294 Make_Private_Extension_Declaration
(Loc
,
1295 Defining_Identifier
=> T
,
1296 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1297 Unknown_Discriminants_Present
=> Unk_Disc
,
1298 Subtype_Indication
=> Subtype_Mark
(Def
));
1300 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1304 Make_Full_Type_Declaration
(Loc
,
1305 Defining_Identifier
=> T
,
1306 Discriminant_Specifications
=>
1307 Discriminant_Specifications
(Parent
(T
)),
1309 Make_Derived_Type_Definition
(Loc
,
1310 Subtype_Indication
=> Subtype_Mark
(Def
)));
1312 Set_Abstract_Present
1313 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1320 if not Is_Composite_Type
(T
) then
1322 ("unknown discriminants not allowed for elementary types", N
);
1324 Set_Has_Unknown_Discriminants
(T
);
1325 Set_Is_Constrained
(T
, False);
1329 -- If the parent type has a known size, so does the formal, which
1330 -- makes legal representation clauses that involve the formal.
1332 Set_Size_Known_At_Compile_Time
1333 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1335 end Analyze_Formal_Derived_Type
;
1337 ----------------------------------
1338 -- Analyze_Formal_Discrete_Type --
1339 ----------------------------------
1341 -- The operations defined for a discrete types are those of an
1342 -- enumeration type. The size is set to an arbitrary value, for use
1343 -- in analyzing the generic unit.
1345 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1346 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1352 Set_Ekind
(T
, E_Enumeration_Type
);
1357 -- For semantic analysis, the bounds of the type must be set to some
1358 -- non-static value. The simplest is to create attribute nodes for
1359 -- those bounds, that refer to the type itself. These bounds are never
1360 -- analyzed but serve as place-holders.
1363 Make_Attribute_Reference
(Loc
,
1364 Attribute_Name
=> Name_First
,
1365 Prefix
=> New_Reference_To
(T
, Loc
));
1369 Make_Attribute_Reference
(Loc
,
1370 Attribute_Name
=> Name_Last
,
1371 Prefix
=> New_Reference_To
(T
, Loc
));
1374 Set_Scalar_Range
(T
,
1379 end Analyze_Formal_Discrete_Type
;
1381 ----------------------------------
1382 -- Analyze_Formal_Floating_Type --
1383 ---------------------------------
1385 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1386 Base
: constant Entity_Id
:=
1388 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1391 -- The various semantic attributes are taken from the predefined type
1392 -- Float, just so that all of them are initialized. Their values are
1393 -- never used because no constant folding or expansion takes place in
1394 -- the generic itself.
1397 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1398 Set_Etype
(T
, Base
);
1399 Set_Size_Info
(T
, (Standard_Float
));
1400 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1401 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1402 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1404 Set_Is_Generic_Type
(Base
);
1405 Set_Etype
(Base
, Base
);
1406 Set_Size_Info
(Base
, (Standard_Float
));
1407 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1408 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1409 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1410 Set_Parent
(Base
, Parent
(Def
));
1412 Check_Restriction
(No_Floating_Point
, Def
);
1413 end Analyze_Formal_Floating_Type
;
1415 ---------------------------------
1416 -- Analyze_Formal_Modular_Type --
1417 ---------------------------------
1419 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1421 -- Apart from their entity kind, generic modular types are treated
1422 -- like signed integer types, and have the same attributes.
1424 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1425 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1426 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1428 end Analyze_Formal_Modular_Type
;
1430 ---------------------------------------
1431 -- Analyze_Formal_Object_Declaration --
1432 ---------------------------------------
1434 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1435 E
: constant Node_Id
:= Expression
(N
);
1436 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1443 -- Determine the mode of the formal object
1445 if Out_Present
(N
) then
1446 K
:= E_Generic_In_Out_Parameter
;
1448 if not In_Present
(N
) then
1449 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1453 K
:= E_Generic_In_Parameter
;
1456 Find_Type
(Subtype_Mark
(N
));
1457 T
:= Entity
(Subtype_Mark
(N
));
1459 if Ekind
(T
) = E_Incomplete_Type
then
1460 Error_Msg_N
("premature usage of incomplete type", Subtype_Mark
(N
));
1463 if K
= E_Generic_In_Parameter
then
1465 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1467 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1469 ("generic formal of mode IN must not be of limited type", N
);
1470 Explain_Limited_Type
(T
, N
);
1473 if Is_Abstract
(T
) then
1475 ("generic formal of mode IN must not be of abstract type", N
);
1479 Analyze_Per_Use_Expression
(E
, T
);
1485 -- Case of generic IN OUT parameter.
1488 -- If the formal has an unconstrained type, construct its
1489 -- actual subtype, as is done for subprogram formals. In this
1490 -- fashion, all its uses can refer to specific bounds.
1495 if (Is_Array_Type
(T
)
1496 and then not Is_Constrained
(T
))
1498 (Ekind
(T
) = E_Record_Type
1499 and then Has_Discriminants
(T
))
1502 Non_Freezing_Ref
: constant Node_Id
:=
1503 New_Reference_To
(Id
, Sloc
(Id
));
1507 -- Make sure that the actual subtype doesn't generate
1510 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1511 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1512 Insert_Before_And_Analyze
(N
, Decl
);
1513 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1516 Set_Actual_Subtype
(Id
, T
);
1521 ("initialization not allowed for `IN OUT` formals", N
);
1525 end Analyze_Formal_Object_Declaration
;
1527 ----------------------------------------------
1528 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1529 ----------------------------------------------
1531 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1535 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1536 Base
: constant Entity_Id
:=
1538 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1540 -- The semantic attributes are set for completeness only, their
1541 -- values will never be used, because all properties of the type
1545 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1546 Set_Etype
(T
, Base
);
1547 Set_Size_Info
(T
, Standard_Integer
);
1548 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1549 Set_Small_Value
(T
, Ureal_1
);
1550 Set_Delta_Value
(T
, Ureal_1
);
1551 Set_Scalar_Range
(T
,
1553 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1554 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1556 Set_Is_Generic_Type
(Base
);
1557 Set_Etype
(Base
, Base
);
1558 Set_Size_Info
(Base
, Standard_Integer
);
1559 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1560 Set_Small_Value
(Base
, Ureal_1
);
1561 Set_Delta_Value
(Base
, Ureal_1
);
1562 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1563 Set_Parent
(Base
, Parent
(Def
));
1565 Check_Restriction
(No_Fixed_Point
, Def
);
1566 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1568 ----------------------------
1569 -- Analyze_Formal_Package --
1570 ----------------------------
1572 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1573 Loc
: constant Source_Ptr
:= Sloc
(N
);
1574 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1576 Gen_Id
: constant Node_Id
:= Name
(N
);
1578 Gen_Unit
: Entity_Id
;
1580 Parent_Installed
: Boolean := False;
1582 Parent_Instance
: Entity_Id
;
1583 Renaming_In_Par
: Entity_Id
;
1586 Text_IO_Kludge
(Gen_Id
);
1589 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
1590 Gen_Unit
:= Entity
(Gen_Id
);
1592 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
1593 Error_Msg_N
("expect generic package name", Gen_Id
);
1597 elsif Gen_Unit
= Current_Scope
then
1599 ("generic package cannot be used as a formal package of itself",
1604 elsif In_Open_Scopes
(Gen_Unit
) then
1605 if Is_Compilation_Unit
(Gen_Unit
)
1606 and then Is_Child_Unit
(Current_Scope
)
1608 -- Special-case the error when the formal is a parent, and
1609 -- continue analysis to minimize cascaded errors.
1612 ("generic parent cannot be used as formal package "
1613 & "of a child unit",
1618 ("generic package cannot be used as a formal package "
1626 -- Check for a formal package that is a package renaming.
1628 if Present
(Renamed_Object
(Gen_Unit
)) then
1629 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
1632 -- The formal package is treated like a regular instance, but only
1633 -- the specification needs to be instantiated, to make entities visible.
1635 if not Box_Present
(N
) then
1636 Hidden_Entities
:= New_Elmt_List
;
1637 Analyze_Package_Instantiation
(N
);
1639 if Parent_Installed
then
1644 -- If there are no generic associations, the generic parameters
1645 -- appear as local entities and are instantiated like them. We copy
1646 -- the generic package declaration as if it were an instantiation,
1647 -- and analyze it like a regular package, except that we treat the
1648 -- formals as additional visible components.
1650 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
1652 if In_Extended_Main_Source_Unit
(N
) then
1653 Set_Is_Instantiated
(Gen_Unit
);
1654 Generate_Reference
(Gen_Unit
, N
);
1657 Formal
:= New_Copy
(Pack_Id
);
1660 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
1662 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
1663 Set_Instance_Env
(Gen_Unit
, Formal
);
1665 Enter_Name
(Formal
);
1666 Set_Ekind
(Formal
, E_Generic_Package
);
1667 Set_Etype
(Formal
, Standard_Void_Type
);
1668 Set_Inner_Instances
(Formal
, New_Elmt_List
);
1671 -- Within the formal, the name of the generic package is a renaming
1672 -- of the formal (as for a regular instantiation).
1674 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1675 Defining_Unit_Name
=>
1676 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1677 Name
=> New_Reference_To
(Formal
, Loc
));
1679 if Present
(Visible_Declarations
(Specification
(N
))) then
1680 Prepend
(Renaming
, To
=> Visible_Declarations
(Specification
(N
)));
1681 elsif Present
(Private_Declarations
(Specification
(N
))) then
1682 Prepend
(Renaming
, To
=> Private_Declarations
(Specification
(N
)));
1685 if Is_Child_Unit
(Gen_Unit
)
1686 and then Parent_Installed
1688 -- Similarly, we have to make the name of the formal visible in
1689 -- the parent instance, to resolve properly fully qualified names
1690 -- that may appear in the generic unit. The parent instance has
1691 -- been placed on the scope stack ahead of the current scope.
1693 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
1696 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
1697 Set_Ekind
(Renaming_In_Par
, E_Package
);
1698 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
1699 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
1700 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
1701 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
1702 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
1705 Analyze_Generic_Formal_Part
(N
);
1706 Analyze
(Specification
(N
));
1707 End_Package_Scope
(Formal
);
1709 if Parent_Installed
then
1715 -- Inside the generic unit, the formal package is a regular
1716 -- package, but no body is needed for it. Note that after
1717 -- instantiation, the defining_unit_name we need is in the
1718 -- new tree and not in the original. (see Package_Instantiation).
1719 -- A generic formal package is an instance, and can be used as
1720 -- an actual for an inner instance. Mark its generic parent.
1722 Set_Ekind
(Formal
, E_Package
);
1723 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
1724 Set_Has_Completion
(Formal
, True);
1726 Set_Ekind
(Pack_Id
, E_Package
);
1727 Set_Etype
(Pack_Id
, Standard_Void_Type
);
1728 Set_Scope
(Pack_Id
, Scope
(Formal
));
1729 Set_Has_Completion
(Pack_Id
, True);
1731 end Analyze_Formal_Package
;
1733 ---------------------------------
1734 -- Analyze_Formal_Private_Type --
1735 ---------------------------------
1737 procedure Analyze_Formal_Private_Type
1743 New_Private_Type
(N
, T
, Def
);
1745 -- Set the size to an arbitrary but legal value.
1747 Set_Size_Info
(T
, Standard_Integer
);
1748 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1749 end Analyze_Formal_Private_Type
;
1751 ----------------------------------------
1752 -- Analyze_Formal_Signed_Integer_Type --
1753 ----------------------------------------
1755 procedure Analyze_Formal_Signed_Integer_Type
1759 Base
: constant Entity_Id
:=
1761 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
1766 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
1767 Set_Etype
(T
, Base
);
1768 Set_Size_Info
(T
, Standard_Integer
);
1769 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1770 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
1772 Set_Is_Generic_Type
(Base
);
1773 Set_Size_Info
(Base
, Standard_Integer
);
1774 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1775 Set_Etype
(Base
, Base
);
1776 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
1777 Set_Parent
(Base
, Parent
(Def
));
1778 end Analyze_Formal_Signed_Integer_Type
;
1780 -------------------------------
1781 -- Analyze_Formal_Subprogram --
1782 -------------------------------
1784 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
1785 Spec
: constant Node_Id
:= Specification
(N
);
1786 Def
: constant Node_Id
:= Default_Name
(N
);
1787 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
1795 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
1796 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
1800 Analyze_Subprogram_Declaration
(N
);
1801 Set_Is_Formal_Subprogram
(Nam
);
1802 Set_Has_Completion
(Nam
);
1804 -- Default name is resolved at the point of instantiation
1806 if Box_Present
(N
) then
1809 -- Else default is bound at the point of generic declaration
1811 elsif Present
(Def
) then
1812 if Nkind
(Def
) = N_Operator_Symbol
then
1813 Find_Direct_Name
(Def
);
1815 elsif Nkind
(Def
) /= N_Attribute_Reference
then
1819 -- For an attribute reference, analyze the prefix and verify
1820 -- that it has the proper profile for the subprogram.
1822 Analyze
(Prefix
(Def
));
1823 Valid_Default_Attribute
(Nam
, Def
);
1827 -- Default name may be overloaded, in which case the interpretation
1828 -- with the correct profile must be selected, as for a renaming.
1830 if Etype
(Def
) = Any_Type
then
1833 elsif Nkind
(Def
) = N_Selected_Component
then
1834 Subp
:= Entity
(Selector_Name
(Def
));
1836 if Ekind
(Subp
) /= E_Entry
then
1837 Error_Msg_N
("expect valid subprogram name as default", Def
);
1841 elsif Nkind
(Def
) = N_Indexed_Component
then
1843 if Nkind
(Prefix
(Def
)) /= N_Selected_Component
then
1844 Error_Msg_N
("expect valid subprogram name as default", Def
);
1848 Subp
:= Entity
(Selector_Name
(Prefix
(Def
)));
1850 if Ekind
(Subp
) /= E_Entry_Family
then
1851 Error_Msg_N
("expect valid subprogram name as default", Def
);
1856 elsif Nkind
(Def
) = N_Character_Literal
then
1858 -- Needs some type checks: subprogram should be parameterless???
1860 Resolve
(Def
, (Etype
(Nam
)));
1862 elsif not Is_Entity_Name
(Def
)
1863 or else not Is_Overloadable
(Entity
(Def
))
1865 Error_Msg_N
("expect valid subprogram name as default", Def
);
1868 elsif not Is_Overloaded
(Def
) then
1869 Subp
:= Entity
(Def
);
1872 Error_Msg_N
("premature usage of formal subprogram", Def
);
1874 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
1875 Error_Msg_N
("no visible entity matches specification", Def
);
1881 I1
: Interp_Index
:= 0;
1887 Get_First_Interp
(Def
, I
, It
);
1888 while Present
(It
.Nam
) loop
1890 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
1891 if Subp
/= Any_Id
then
1892 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
1894 if It1
= No_Interp
then
1895 Error_Msg_N
("ambiguous default subprogram", Def
);
1908 Get_Next_Interp
(I
, It
);
1912 if Subp
/= Any_Id
then
1913 Set_Entity
(Def
, Subp
);
1916 Error_Msg_N
("premature usage of formal subprogram", Def
);
1918 elsif Ekind
(Subp
) /= E_Operator
then
1919 Check_Mode_Conformant
(Subp
, Nam
);
1923 Error_Msg_N
("no visible subprogram matches specification", N
);
1927 end Analyze_Formal_Subprogram
;
1929 -------------------------------------
1930 -- Analyze_Formal_Type_Declaration --
1931 -------------------------------------
1933 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
1934 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
1938 T
:= Defining_Identifier
(N
);
1940 if Present
(Discriminant_Specifications
(N
))
1941 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
1944 ("discriminants not allowed for this formal type",
1945 Defining_Identifier
(First
(Discriminant_Specifications
(N
))));
1948 -- Enter the new name, and branch to specific routine.
1951 when N_Formal_Private_Type_Definition
=>
1952 Analyze_Formal_Private_Type
(N
, T
, Def
);
1954 when N_Formal_Derived_Type_Definition
=>
1955 Analyze_Formal_Derived_Type
(N
, T
, Def
);
1957 when N_Formal_Discrete_Type_Definition
=>
1958 Analyze_Formal_Discrete_Type
(T
, Def
);
1960 when N_Formal_Signed_Integer_Type_Definition
=>
1961 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1963 when N_Formal_Modular_Type_Definition
=>
1964 Analyze_Formal_Modular_Type
(T
, Def
);
1966 when N_Formal_Floating_Point_Definition
=>
1967 Analyze_Formal_Floating_Type
(T
, Def
);
1969 when N_Formal_Ordinary_Fixed_Point_Definition
=>
1970 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
1972 when N_Formal_Decimal_Fixed_Point_Definition
=>
1973 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
1975 when N_Array_Type_Definition
=>
1976 Analyze_Formal_Array_Type
(T
, Def
);
1978 when N_Access_To_Object_Definition |
1979 N_Access_Function_Definition |
1980 N_Access_Procedure_Definition
=>
1981 Analyze_Generic_Access_Type
(T
, Def
);
1987 raise Program_Error
;
1991 Set_Is_Generic_Type
(T
);
1992 end Analyze_Formal_Type_Declaration
;
1994 ------------------------------------
1995 -- Analyze_Function_Instantiation --
1996 ------------------------------------
1998 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2000 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2001 end Analyze_Function_Instantiation
;
2003 ---------------------------------
2004 -- Analyze_Generic_Access_Type --
2005 ---------------------------------
2007 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2011 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2012 Access_Type_Declaration
(T
, Def
);
2014 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2015 and then No
(Full_View
(Designated_Type
(T
)))
2016 and then not Is_Generic_Type
(Designated_Type
(T
))
2018 Error_Msg_N
("premature usage of incomplete type", Def
);
2020 elsif Is_Internal
(Designated_Type
(T
)) then
2022 ("only a subtype mark is allowed in a formal", Def
);
2026 Access_Subprogram_Declaration
(T
, Def
);
2028 end Analyze_Generic_Access_Type
;
2030 ---------------------------------
2031 -- Analyze_Generic_Formal_Part --
2032 ---------------------------------
2034 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2035 Gen_Parm_Decl
: Node_Id
;
2038 -- The generic formals are processed in the scope of the generic
2039 -- unit, where they are immediately visible. The scope is installed
2042 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2044 while Present
(Gen_Parm_Decl
) loop
2045 Analyze
(Gen_Parm_Decl
);
2046 Next
(Gen_Parm_Decl
);
2049 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2050 end Analyze_Generic_Formal_Part
;
2052 ------------------------------------------
2053 -- Analyze_Generic_Package_Declaration --
2054 ------------------------------------------
2056 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2057 Loc
: constant Source_Ptr
:= Sloc
(N
);
2060 Save_Parent
: Node_Id
;
2062 Decls
: constant List_Id
:=
2063 Visible_Declarations
(Specification
(N
));
2067 -- We introduce a renaming of the enclosing package, to have a usable
2068 -- entity as the prefix of an expanded name for a local entity of the
2069 -- form Par.P.Q, where P is the generic package. This is because a local
2070 -- entity named P may hide it, so that the usual visibility rules in
2071 -- the instance will not resolve properly.
2074 Make_Package_Renaming_Declaration
(Loc
,
2075 Defining_Unit_Name
=>
2076 Make_Defining_Identifier
(Loc
,
2077 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2078 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2080 if Present
(Decls
) then
2081 Decl
:= First
(Decls
);
2082 while Present
(Decl
)
2083 and then Nkind
(Decl
) = N_Pragma
2088 if Present
(Decl
) then
2089 Insert_Before
(Decl
, Renaming
);
2091 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2095 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2098 -- Create copy of generic unit, and save for instantiation.
2099 -- If the unit is a child unit, do not copy the specifications
2100 -- for the parent, which are not part of the generic tree.
2102 Save_Parent
:= Parent_Spec
(N
);
2103 Set_Parent_Spec
(N
, Empty
);
2105 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2106 Set_Parent_Spec
(New_N
, Save_Parent
);
2108 Id
:= Defining_Entity
(N
);
2109 Generate_Definition
(Id
);
2111 -- Expansion is not applied to generic units.
2116 Set_Ekind
(Id
, E_Generic_Package
);
2117 Set_Etype
(Id
, Standard_Void_Type
);
2119 Enter_Generic_Scope
(Id
);
2120 Set_Inner_Instances
(Id
, New_Elmt_List
);
2122 Set_Categorization_From_Pragmas
(N
);
2123 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2125 -- Link the declaration of the generic homonym in the generic copy
2126 -- to the package it renames, so that it is always resolved properly.
2128 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2129 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2131 -- For a library unit, we have reconstructed the entity for the
2132 -- unit, and must reset it in the library tables.
2134 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2135 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2138 Analyze_Generic_Formal_Part
(N
);
2140 -- After processing the generic formals, analysis proceeds
2141 -- as for a non-generic package.
2143 Analyze
(Specification
(N
));
2145 Validate_Categorization_Dependency
(N
, Id
);
2149 End_Package_Scope
(Id
);
2150 Exit_Generic_Scope
(Id
);
2152 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2153 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2154 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2155 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2158 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2159 Validate_RT_RAT_Component
(N
);
2161 -- If this is a spec without a body, check that generic parameters
2164 if not Body_Required
(Parent
(N
)) then
2165 Check_References
(Id
);
2168 end Analyze_Generic_Package_Declaration
;
2170 --------------------------------------------
2171 -- Analyze_Generic_Subprogram_Declaration --
2172 --------------------------------------------
2174 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2179 Save_Parent
: Node_Id
;
2182 -- Create copy of generic unit,and save for instantiation.
2183 -- If the unit is a child unit, do not copy the specifications
2184 -- for the parent, which are not part of the generic tree.
2186 Save_Parent
:= Parent_Spec
(N
);
2187 Set_Parent_Spec
(N
, Empty
);
2189 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2190 Set_Parent_Spec
(New_N
, Save_Parent
);
2193 Spec
:= Specification
(N
);
2194 Id
:= Defining_Entity
(Spec
);
2195 Generate_Definition
(Id
);
2197 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2199 ("operator symbol not allowed for generic subprogram", Id
);
2206 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2208 Enter_Generic_Scope
(Id
);
2209 Set_Inner_Instances
(Id
, New_Elmt_List
);
2210 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2212 Analyze_Generic_Formal_Part
(N
);
2214 Formals
:= Parameter_Specifications
(Spec
);
2216 if Present
(Formals
) then
2217 Process_Formals
(Formals
, Spec
);
2220 if Nkind
(Spec
) = N_Function_Specification
then
2221 Set_Ekind
(Id
, E_Generic_Function
);
2222 Find_Type
(Subtype_Mark
(Spec
));
2223 Set_Etype
(Id
, Entity
(Subtype_Mark
(Spec
)));
2225 Set_Ekind
(Id
, E_Generic_Procedure
);
2226 Set_Etype
(Id
, Standard_Void_Type
);
2229 -- For a library unit, we have reconstructed the entity for the
2230 -- unit, and must reset it in the library tables. We also need
2231 -- to make sure that Body_Required is set properly in the original
2232 -- compilation unit node.
2234 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2235 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2236 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2239 Set_Categorization_From_Pragmas
(N
);
2240 Validate_Categorization_Dependency
(N
, Id
);
2242 Save_Global_References
(Original_Node
(N
));
2246 Exit_Generic_Scope
(Id
);
2247 Generate_Reference_To_Formals
(Id
);
2248 end Analyze_Generic_Subprogram_Declaration
;
2250 -----------------------------------
2251 -- Analyze_Package_Instantiation --
2252 -----------------------------------
2254 -- Note: this procedure is also used for formal package declarations,
2255 -- in which case the argument N is an N_Formal_Package_Declaration
2256 -- node. This should really be noted in the spec! ???
2258 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2259 Loc
: constant Source_Ptr
:= Sloc
(N
);
2260 Gen_Id
: constant Node_Id
:= Name
(N
);
2263 Act_Decl_Name
: Node_Id
;
2264 Act_Decl_Id
: Entity_Id
;
2269 Gen_Unit
: Entity_Id
;
2271 Is_Actual_Pack
: constant Boolean :=
2272 Is_Internal
(Defining_Entity
(N
));
2274 Parent_Installed
: Boolean := False;
2275 Renaming_List
: List_Id
;
2276 Unit_Renaming
: Node_Id
;
2277 Needs_Body
: Boolean;
2278 Inline_Now
: Boolean := False;
2280 procedure Delay_Descriptors
(E
: Entity_Id
);
2281 -- Delay generation of subprogram descriptors for given entity
2283 function Might_Inline_Subp
return Boolean;
2284 -- If inlining is active and the generic contains inlined subprograms,
2285 -- we instantiate the body. This may cause superfluous instantiations,
2286 -- but it is simpler than detecting the need for the body at the point
2287 -- of inlining, when the context of the instance is not available.
2289 -----------------------
2290 -- Delay_Descriptors --
2291 -----------------------
2293 procedure Delay_Descriptors
(E
: Entity_Id
) is
2295 if not Delay_Subprogram_Descriptors
(E
) then
2296 Set_Delay_Subprogram_Descriptors
(E
);
2297 Pending_Descriptor
.Increment_Last
;
2298 Pending_Descriptor
.Table
(Pending_Descriptor
.Last
) := E
;
2300 end Delay_Descriptors
;
2302 -----------------------
2303 -- Might_Inline_Subp --
2304 -----------------------
2306 function Might_Inline_Subp
return Boolean is
2310 if not Inline_Processing_Required
then
2314 E
:= First_Entity
(Gen_Unit
);
2315 while Present
(E
) loop
2316 if Is_Subprogram
(E
)
2317 and then Is_Inlined
(E
)
2327 end Might_Inline_Subp
;
2329 -- Start of processing for Analyze_Package_Instantiation
2332 -- Very first thing: apply the special kludge for Text_IO processing
2333 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2335 Text_IO_Kludge
(Name
(N
));
2337 -- Make node global for error reporting.
2339 Instantiation_Node
:= N
;
2341 -- Case of instantiation of a generic package
2343 if Nkind
(N
) = N_Package_Instantiation
then
2344 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2345 Set_Comes_From_Source
(Act_Decl_Id
, True);
2347 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2349 Make_Defining_Program_Unit_Name
(Loc
,
2350 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2351 Defining_Identifier
=> Act_Decl_Id
);
2353 Act_Decl_Name
:= Act_Decl_Id
;
2356 -- Case of instantiation of a formal package
2359 Act_Decl_Id
:= Defining_Identifier
(N
);
2360 Act_Decl_Name
:= Act_Decl_Id
;
2363 Generate_Definition
(Act_Decl_Id
);
2364 Pre_Analyze_Actuals
(N
);
2367 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2368 Gen_Unit
:= Entity
(Gen_Id
);
2370 -- Verify that it is the name of a generic package
2372 if Etype
(Gen_Unit
) = Any_Type
then
2376 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2378 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2380 if From_With_Type
(Gen_Unit
) then
2382 ("cannot instantiate a limited withed package", Gen_Id
);
2385 ("expect name of generic package in instantiation", Gen_Id
);
2392 if In_Extended_Main_Source_Unit
(N
) then
2393 Set_Is_Instantiated
(Gen_Unit
);
2394 Generate_Reference
(Gen_Unit
, N
);
2396 if Present
(Renamed_Object
(Gen_Unit
)) then
2397 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2398 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2402 if Nkind
(Gen_Id
) = N_Identifier
2403 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2406 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2408 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2409 and then Is_Child_Unit
(Gen_Unit
)
2410 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2411 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2414 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2417 Set_Entity
(Gen_Id
, Gen_Unit
);
2419 -- If generic is a renaming, get original generic unit.
2421 if Present
(Renamed_Object
(Gen_Unit
))
2422 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2424 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2427 -- Verify that there are no circular instantiations.
2429 if In_Open_Scopes
(Gen_Unit
) then
2430 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2434 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2435 Error_Msg_Node_2
:= Current_Scope
;
2437 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2438 Circularity_Detected
:= True;
2443 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
2444 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2446 -- Initialize renamings map, for error checking, and the list
2447 -- that holds private entities whose views have changed between
2448 -- generic definition and instantiation. If this is the instance
2449 -- created to validate an actual package, the instantiation
2450 -- environment is that of the enclosing instance.
2452 Generic_Renamings
.Set_Last
(0);
2453 Generic_Renamings_HTable
.Reset
;
2455 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2457 -- Copy original generic tree, to produce text for instantiation.
2461 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
2463 Act_Spec
:= Specification
(Act_Tree
);
2465 -- If this is the instance created to validate an actual package,
2466 -- only the formals matter, do not examine the package spec itself.
2468 if Is_Actual_Pack
then
2469 Set_Visible_Declarations
(Act_Spec
, New_List
);
2470 Set_Private_Declarations
(Act_Spec
, New_List
);
2474 Analyze_Associations
2476 Generic_Formal_Declarations
(Act_Tree
),
2477 Generic_Formal_Declarations
(Gen_Decl
));
2479 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
2480 Set_Is_Generic_Instance
(Act_Decl_Id
);
2482 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
2484 -- References to the generic in its own declaration or its body
2485 -- are references to the instance. Add a renaming declaration for
2486 -- the generic unit itself. This declaration, as well as the renaming
2487 -- declarations for the generic formals, must remain private to the
2488 -- unit: the formals, because this is the language semantics, and
2489 -- the unit because its use is an artifact of the implementation.
2492 Make_Package_Renaming_Declaration
(Loc
,
2493 Defining_Unit_Name
=>
2494 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2495 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
2497 Append
(Unit_Renaming
, Renaming_List
);
2499 -- The renaming declarations are the first local declarations of
2502 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
2504 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
2506 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
2510 Make_Package_Declaration
(Loc
,
2511 Specification
=> Act_Spec
);
2513 -- Save the instantiation node, for subsequent instantiation
2514 -- of the body, if there is one and we are generating code for
2515 -- the current unit. Mark the unit as having a body, to avoid
2516 -- a premature error message.
2518 -- We instantiate the body if we are generating code, if we are
2519 -- generating cross-reference information, or if we are building
2520 -- trees for ASIS use.
2523 Enclosing_Body_Present
: Boolean := False;
2524 -- If the generic unit is not a compilation unit, then a body
2525 -- may be present in its parent even if none is required. We
2526 -- create a tentative pending instantiation for the body, which
2527 -- will be discarded if none is actually present.
2532 if Scope
(Gen_Unit
) /= Standard_Standard
2533 and then not Is_Child_Unit
(Gen_Unit
)
2535 Scop
:= Scope
(Gen_Unit
);
2537 while Present
(Scop
)
2538 and then Scop
/= Standard_Standard
2540 if Unit_Requires_Body
(Scop
) then
2541 Enclosing_Body_Present
:= True;
2544 elsif In_Open_Scopes
(Scop
)
2545 and then In_Package_Body
(Scop
)
2547 Enclosing_Body_Present
:= True;
2551 exit when Is_Compilation_Unit
(Scop
);
2552 Scop
:= Scope
(Scop
);
2556 -- If front-end inlining is enabled, and this is a unit for which
2557 -- code will be generated, we instantiate the body at once.
2558 -- This is done if the instance is not the main unit, and if the
2559 -- generic is not a child unit of another generic, to avoid scope
2560 -- problems and the reinstallation of parent instances.
2562 if Front_End_Inlining
2563 and then Expander_Active
2564 and then (not Is_Child_Unit
(Gen_Unit
)
2565 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
2566 and then Is_In_Main_Unit
(N
)
2567 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2568 and then Might_Inline_Subp
2569 and then not Is_Actual_Pack
2575 (Unit_Requires_Body
(Gen_Unit
)
2576 or else Enclosing_Body_Present
2577 or else Present
(Corresponding_Body
(Gen_Decl
)))
2578 and then (Is_In_Main_Unit
(N
)
2579 or else Might_Inline_Subp
)
2580 and then not Is_Actual_Pack
2581 and then not Inline_Now
2583 and then (Operating_Mode
= Generate_Code
2584 or else (Operating_Mode
= Check_Semantics
2585 and then ASIS_Mode
));
2587 -- If front_end_inlining is enabled, do not instantiate a
2588 -- body if within a generic context.
2590 if (Front_End_Inlining
2591 and then not Expander_Active
)
2592 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
2594 Needs_Body
:= False;
2597 -- If the current context is generic, and the package being
2598 -- instantiated is declared within a formal package, there
2599 -- is no body to instantiate until the enclosing generic is
2600 -- instantiated, and there is an actual for the formal
2601 -- package. If the formal package has parameters, we build a
2602 -- regular package instance for it, that preceeds the original
2603 -- formal package declaration.
2605 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
2607 Decl
: constant Node_Id
:=
2609 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
2611 if Nkind
(Decl
) = N_Formal_Package_Declaration
2612 or else (Nkind
(Decl
) = N_Package_Declaration
2613 and then Is_List_Member
(Decl
)
2614 and then Present
(Next
(Decl
))
2616 Nkind
(Next
(Decl
)) = N_Formal_Package_Declaration
)
2618 Needs_Body
:= False;
2624 -- If we are generating the calling stubs from the instantiation
2625 -- of a generic RCI package, we will not use the body of the
2628 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
2629 and then Is_Compilation_Unit
(Defining_Entity
(N
))
2631 Needs_Body
:= False;
2636 -- Here is a defence against a ludicrous number of instantiations
2637 -- caused by a circular set of instantiation attempts.
2639 if Pending_Instantiations
.Last
>
2640 Hostparm
.Max_Instantiations
2642 Error_Msg_N
("too many instantiations", N
);
2643 raise Unrecoverable_Error
;
2646 -- Indicate that the enclosing scopes contain an instantiation,
2647 -- and that cleanup actions should be delayed until after the
2648 -- instance body is expanded.
2650 Check_Forward_Instantiation
(Gen_Decl
);
2651 if Nkind
(N
) = N_Package_Instantiation
then
2653 Enclosing_Master
: Entity_Id
:= Current_Scope
;
2656 while Enclosing_Master
/= Standard_Standard
loop
2658 if Ekind
(Enclosing_Master
) = E_Package
then
2659 if Is_Compilation_Unit
(Enclosing_Master
) then
2660 if In_Package_Body
(Enclosing_Master
) then
2662 (Body_Entity
(Enclosing_Master
));
2671 Enclosing_Master
:= Scope
(Enclosing_Master
);
2674 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
2675 Enclosing_Master
:= Scope
(Enclosing_Master
);
2677 elsif Is_Generic_Subprogram
(Enclosing_Master
)
2678 or else Ekind
(Enclosing_Master
) = E_Void
2680 -- Cleanup actions will eventually be performed on
2681 -- the enclosing instance, if any. enclosing scope
2682 -- is void in the formal part of a generic subp.
2687 if Ekind
(Enclosing_Master
) = E_Entry
2689 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
2692 Protected_Body_Subprogram
(Enclosing_Master
);
2695 Set_Delay_Cleanups
(Enclosing_Master
);
2697 while Ekind
(Enclosing_Master
) = E_Block
loop
2698 Enclosing_Master
:= Scope
(Enclosing_Master
);
2701 if Is_Subprogram
(Enclosing_Master
) then
2702 Delay_Descriptors
(Enclosing_Master
);
2704 elsif Is_Task_Type
(Enclosing_Master
) then
2706 TBP
: constant Node_Id
:=
2707 Get_Task_Body_Procedure
2711 if Present
(TBP
) then
2712 Delay_Descriptors
(TBP
);
2713 Set_Delay_Cleanups
(TBP
);
2723 -- Make entry in table
2725 Pending_Instantiations
.Increment_Last
;
2726 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
2727 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
2731 Set_Categorization_From_Pragmas
(Act_Decl
);
2733 if Parent_Installed
then
2737 Set_Instance_Spec
(N
, Act_Decl
);
2739 -- If not a compilation unit, insert the package declaration
2740 -- before the original instantiation node.
2742 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2743 Mark_Rewrite_Insertion
(Act_Decl
);
2744 Insert_Before
(N
, Act_Decl
);
2747 -- For an instantiation that is a compilation unit, place
2748 -- declaration on current node so context is complete
2749 -- for analysis (including nested instantiations). It this
2750 -- is the main unit, the declaration eventually replaces the
2751 -- instantiation node. If the instance body is later created, it
2752 -- replaces the instance node, and the declation is attached to
2753 -- it (see Build_Instance_Compilation_Unit_Nodes).
2756 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
2758 -- The entity for the current unit is the newly created one,
2759 -- and all semantic information is attached to it.
2761 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
2763 -- If this is the main unit, replace the main entity as well.
2765 if Current_Sem_Unit
= Main_Unit
then
2766 Main_Unit_Entity
:= Act_Decl_Id
;
2770 Set_Unit
(Parent
(N
), Act_Decl
);
2771 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
2773 Set_Unit
(Parent
(N
), N
);
2774 Set_Body_Required
(Parent
(N
), False);
2776 -- We never need elaboration checks on instantiations, since
2777 -- by definition, the body instantiation is elaborated at the
2778 -- same time as the spec instantiation.
2780 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
2781 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
2784 Check_Elab_Instantiation
(N
);
2786 if ABE_Is_Certain
(N
) and then Needs_Body
then
2787 Pending_Instantiations
.Decrement_Last
;
2789 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
2791 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
2792 First_Private_Entity
(Act_Decl_Id
));
2794 -- If the instantiation will receive a body, the unit will
2795 -- be transformed into a package body, and receive its own
2796 -- elaboration entity. Otherwise, the nature of the unit is
2797 -- now a package declaration.
2799 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2800 and then not Needs_Body
2802 Rewrite
(N
, Act_Decl
);
2805 if Present
(Corresponding_Body
(Gen_Decl
))
2806 or else Unit_Requires_Body
(Gen_Unit
)
2808 Set_Has_Completion
(Act_Decl_Id
);
2811 Check_Formal_Packages
(Act_Decl_Id
);
2813 Restore_Private_Views
(Act_Decl_Id
);
2815 if not Generic_Separately_Compiled
(Gen_Unit
) then
2816 Inherit_Context
(Gen_Decl
, N
);
2819 if Parent_Installed
then
2826 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
2828 -- Check restriction, but skip this if something went wrong in
2829 -- the above analysis, indicated by Act_Decl_Id being void.
2831 if Ekind
(Act_Decl_Id
) /= E_Void
2832 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
2834 Check_Restriction
(No_Local_Allocators
, N
);
2838 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
2842 when Instantiation_Error
=>
2843 if Parent_Installed
then
2846 end Analyze_Package_Instantiation
;
2848 --------------------------
2849 -- Inline_Instance_Body --
2850 --------------------------
2852 procedure Inline_Instance_Body
2854 Gen_Unit
: Entity_Id
;
2858 Gen_Comp
: constant Entity_Id
:=
2859 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
2860 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
2861 Curr_Scope
: Entity_Id
:= Empty
;
2862 Curr_Unit
: constant Entity_Id
:=
2863 Cunit_Entity
(Current_Sem_Unit
);
2864 Removed
: Boolean := False;
2865 Num_Scopes
: Int
:= 0;
2866 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2867 Instances
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2868 Inner_Scopes
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2869 Num_Inner
: Int
:= 0;
2870 N_Instances
: Int
:= 0;
2874 -- Case of generic unit defined in another unit. We must remove
2875 -- the complete context of the current unit to install that of
2878 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
2882 and then S
/= Standard_Standard
2884 Num_Scopes
:= Num_Scopes
+ 1;
2886 Use_Clauses
(Num_Scopes
) :=
2888 (Scope_Stack
.Last
- Num_Scopes
+ 1).
2890 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
2892 exit when Is_Generic_Instance
(S
)
2893 and then (In_Package_Body
(S
)
2894 or else Ekind
(S
) = E_Procedure
2895 or else Ekind
(S
) = E_Function
);
2899 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
2901 -- Find and save all enclosing instances
2906 and then S
/= Standard_Standard
2908 if Is_Generic_Instance
(S
) then
2909 N_Instances
:= N_Instances
+ 1;
2910 Instances
(N_Instances
) := S
;
2912 exit when In_Package_Body
(S
);
2918 -- Remove context of current compilation unit, unless we
2919 -- are within a nested package instantiation, in which case
2920 -- the context has been removed previously.
2922 -- If current scope is the body of a child unit, remove context
2928 and then S
/= Standard_Standard
2930 exit when Is_Generic_Instance
(S
)
2931 and then (In_Package_Body
(S
)
2932 or else Ekind
(S
) = E_Procedure
2933 or else Ekind
(S
) = E_Function
);
2936 or else (Ekind
(Curr_Unit
) = E_Package_Body
2937 and then S
= Spec_Entity
(Curr_Unit
))
2938 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
2941 (Unit_Declaration_Node
(Curr_Unit
)))
2945 -- Remove entities in current scopes from visibility, so
2946 -- than instance body is compiled in a clean environment.
2948 Save_Scope_Stack
(Handle_Use
=> False);
2950 if Is_Child_Unit
(S
) then
2952 -- Remove child unit from stack, as well as inner scopes.
2953 -- Removing the context of a child unit removes parent
2956 while Current_Scope
/= S
loop
2957 Num_Inner
:= Num_Inner
+ 1;
2958 Inner_Scopes
(Num_Inner
) := Current_Scope
;
2963 Remove_Context
(Curr_Comp
);
2967 Remove_Context
(Curr_Comp
);
2970 if Ekind
(Curr_Unit
) = E_Package_Body
then
2971 Remove_Context
(Library_Unit
(Curr_Comp
));
2978 New_Scope
(Standard_Standard
);
2979 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
2980 Instantiate_Package_Body
2981 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
2986 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
2988 -- Reset Generic_Instance flag so that use clauses can be installed
2989 -- in the proper order. (See Use_One_Package for effect of enclosing
2990 -- instances on processing of use clauses).
2992 for J
in 1 .. N_Instances
loop
2993 Set_Is_Generic_Instance
(Instances
(J
), False);
2997 Install_Context
(Curr_Comp
);
2999 if Present
(Curr_Scope
)
3000 and then Is_Child_Unit
(Curr_Scope
)
3002 New_Scope
(Curr_Scope
);
3003 Set_Is_Immediately_Visible
(Curr_Scope
);
3005 -- Finally, restore inner scopes as well.
3007 for J
in reverse 1 .. Num_Inner
loop
3008 New_Scope
(Inner_Scopes
(J
));
3012 Restore_Scope_Stack
(Handle_Use
=> False);
3015 -- Restore use clauses. For a child unit, use clauses in the
3016 -- parents are restored when installing the context, so only
3017 -- those in inner scopes (and those local to the child unit itself)
3018 -- need to be installed explicitly.
3020 if Is_Child_Unit
(Curr_Unit
)
3023 for J
in reverse 1 .. Num_Inner
+ 1 loop
3024 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3026 Install_Use_Clauses
(Use_Clauses
(J
));
3030 for J
in reverse 1 .. Num_Scopes
loop
3031 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3033 Install_Use_Clauses
(Use_Clauses
(J
));
3037 for J
in 1 .. N_Instances
loop
3038 Set_Is_Generic_Instance
(Instances
(J
), True);
3041 -- If generic unit is in current unit, current context is correct.
3044 Instantiate_Package_Body
3045 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3047 end Inline_Instance_Body
;
3049 -------------------------------------
3050 -- Analyze_Procedure_Instantiation --
3051 -------------------------------------
3053 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3055 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3056 end Analyze_Procedure_Instantiation
;
3058 --------------------------------------
3059 -- Analyze_Subprogram_Instantiation --
3060 --------------------------------------
3062 procedure Analyze_Subprogram_Instantiation
3066 Loc
: constant Source_Ptr
:= Sloc
(N
);
3067 Gen_Id
: constant Node_Id
:= Name
(N
);
3069 Anon_Id
: constant Entity_Id
:=
3070 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3071 Chars
=> New_External_Name
3072 (Chars
(Defining_Entity
(N
)), 'R'));
3074 Act_Decl_Id
: Entity_Id
;
3079 Gen_Unit
: Entity_Id
;
3081 Pack_Id
: Entity_Id
;
3082 Parent_Installed
: Boolean := False;
3083 Renaming_List
: List_Id
;
3085 procedure Analyze_Instance_And_Renamings
;
3086 -- The instance must be analyzed in a context that includes the
3087 -- mappings of generic parameters into actuals. We create a package
3088 -- declaration for this purpose, and a subprogram with an internal
3089 -- name within the package. The subprogram instance is simply an
3090 -- alias for the internal subprogram, declared in the current scope.
3092 ------------------------------------
3093 -- Analyze_Instance_And_Renamings --
3094 ------------------------------------
3096 procedure Analyze_Instance_And_Renamings
is
3097 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3098 Pack_Decl
: Node_Id
;
3101 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3103 -- For the case of a compilation unit, the container package
3104 -- has the same name as the instantiation, to insure that the
3105 -- binder calls the elaboration procedure with the right name.
3106 -- Copy the entity of the instance, which may have compilation
3107 -- level flags (e.g. Is_Child_Unit) set.
3109 Pack_Id
:= New_Copy
(Def_Ent
);
3112 -- Otherwise we use the name of the instantiation concatenated
3113 -- with its source position to ensure uniqueness if there are
3114 -- several instantiations with the same name.
3117 Make_Defining_Identifier
(Loc
,
3118 Chars
=> New_External_Name
3119 (Related_Id
=> Chars
(Def_Ent
),
3121 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3124 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3125 Specification
=> Make_Package_Specification
(Loc
,
3126 Defining_Unit_Name
=> Pack_Id
,
3127 Visible_Declarations
=> Renaming_List
,
3128 End_Label
=> Empty
));
3130 Set_Instance_Spec
(N
, Pack_Decl
);
3131 Set_Is_Generic_Instance
(Pack_Id
);
3132 Set_Needs_Debug_Info
(Pack_Id
);
3134 -- Case of not a compilation unit
3136 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3137 Mark_Rewrite_Insertion
(Pack_Decl
);
3138 Insert_Before
(N
, Pack_Decl
);
3139 Set_Has_Completion
(Pack_Id
);
3141 -- Case of an instantiation that is a compilation unit
3143 -- Place declaration on current node so context is complete
3144 -- for analysis (including nested instantiations), and for
3145 -- use in a context_clause (see Analyze_With_Clause).
3148 Set_Unit
(Parent
(N
), Pack_Decl
);
3149 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3152 Analyze
(Pack_Decl
);
3153 Check_Formal_Packages
(Pack_Id
);
3154 Set_Is_Generic_Instance
(Pack_Id
, False);
3156 -- Body of the enclosing package is supplied when instantiating
3157 -- the subprogram body, after semantic analysis is completed.
3159 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3161 -- Remove package itself from visibility, so it does not
3162 -- conflict with subprogram.
3164 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3166 -- Set name and scope of internal subprogram so that the
3167 -- proper external name will be generated. The proper scope
3168 -- is the scope of the wrapper package. We need to generate
3169 -- debugging information for the internal subprogram, so set
3170 -- flag accordingly.
3172 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3173 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3175 -- Mark wrapper package as referenced, to avoid spurious
3176 -- warnings if the instantiation appears in various with_
3177 -- clauses of subunits of the main unit.
3179 Set_Referenced
(Pack_Id
);
3182 Set_Is_Generic_Instance
(Anon_Id
);
3183 Set_Needs_Debug_Info
(Anon_Id
);
3184 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3186 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3187 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3188 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3189 Set_Comes_From_Source
(Act_Decl_Id
, True);
3191 -- The signature may involve types that are not frozen yet, but
3192 -- the subprogram will be frozen at the point the wrapper package
3193 -- is frozen, so it does not need its own freeze node. In fact, if
3194 -- one is created, it might conflict with the freezing actions from
3195 -- the wrapper package (see 7206-013).
3197 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3199 -- If the instance is a child unit, mark the Id accordingly. Mark
3200 -- the anonymous entity as well, which is the real subprogram and
3201 -- which is used when the instance appears in a context clause.
3203 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3204 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3205 New_Overloaded_Entity
(Act_Decl_Id
);
3206 Check_Eliminated
(Act_Decl_Id
);
3208 -- In compilation unit case, kill elaboration checks on the
3209 -- instantiation, since they are never needed -- the body is
3210 -- instantiated at the same point as the spec.
3212 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3213 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3214 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3215 Set_Is_Compilation_Unit
(Anon_Id
);
3217 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3220 -- The instance is not a freezing point for the new subprogram.
3222 Set_Is_Frozen
(Act_Decl_Id
, False);
3224 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3225 Valid_Operator_Definition
(Act_Decl_Id
);
3228 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3229 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3230 Set_Has_Completion
(Act_Decl_Id
);
3231 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3233 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3234 Set_Body_Required
(Parent
(N
), False);
3237 end Analyze_Instance_And_Renamings
;
3239 -- Start of processing for Analyze_Subprogram_Instantiation
3242 -- Very first thing: apply the special kludge for Text_IO processing
3243 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3244 -- Of course such an instantiation is bogus (these are packages, not
3245 -- subprograms), but we get a better error message if we do this.
3247 Text_IO_Kludge
(Gen_Id
);
3249 -- Make node global for error reporting.
3251 Instantiation_Node
:= N
;
3252 Pre_Analyze_Actuals
(N
);
3255 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3256 Gen_Unit
:= Entity
(Gen_Id
);
3258 Generate_Reference
(Gen_Unit
, Gen_Id
);
3260 if Nkind
(Gen_Id
) = N_Identifier
3261 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3264 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3267 if Etype
(Gen_Unit
) = Any_Type
then
3272 -- Verify that it is a generic subprogram of the right kind, and that
3273 -- it does not lead to a circular instantiation.
3275 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3276 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3278 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3280 elsif In_Open_Scopes
(Gen_Unit
) then
3281 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3283 elsif K
= E_Procedure
3284 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3286 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3288 ("cannot instantiate generic function as procedure", Gen_Id
);
3291 ("expect name of generic procedure in instantiation", Gen_Id
);
3294 elsif K
= E_Function
3295 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3297 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3299 ("cannot instantiate generic procedure as function", Gen_Id
);
3302 ("expect name of generic function in instantiation", Gen_Id
);
3306 Set_Entity
(Gen_Id
, Gen_Unit
);
3307 Set_Is_Instantiated
(Gen_Unit
);
3309 if In_Extended_Main_Source_Unit
(N
) then
3310 Generate_Reference
(Gen_Unit
, N
);
3313 -- If renaming, get original unit
3315 if Present
(Renamed_Object
(Gen_Unit
))
3316 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
3318 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
3320 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3321 Set_Is_Instantiated
(Gen_Unit
);
3322 Generate_Reference
(Gen_Unit
, N
);
3325 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3326 Error_Msg_Node_2
:= Current_Scope
;
3328 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3329 Circularity_Detected
:= True;
3333 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3335 -- The subprogram itself cannot contain a nested instance, so
3336 -- the current parent is left empty.
3338 Set_Instance_Env
(Gen_Unit
, Empty
);
3340 -- Initialize renamings map, for error checking.
3342 Generic_Renamings
.Set_Last
(0);
3343 Generic_Renamings_HTable
.Reset
;
3345 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3347 -- Copy original generic tree, to produce text for instantiation.
3351 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3353 Act_Spec
:= Specification
(Act_Tree
);
3355 Analyze_Associations
3357 Generic_Formal_Declarations
(Act_Tree
),
3358 Generic_Formal_Declarations
(Gen_Decl
));
3360 -- Build the subprogram declaration, which does not appear
3361 -- in the generic template, and give it a sloc consistent
3362 -- with that of the template.
3364 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
3365 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3367 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
3368 Specification
=> Act_Spec
);
3370 Set_Categorization_From_Pragmas
(Act_Decl
);
3372 if Parent_Installed
then
3376 Append
(Act_Decl
, Renaming_List
);
3377 Analyze_Instance_And_Renamings
;
3379 -- If the generic is marked Import (Intrinsic), then so is the
3380 -- instance. This indicates that there is no body to instantiate.
3381 -- If generic is marked inline, so it the instance, and the
3382 -- anonymous subprogram it renames. If inlined, or else if inlining
3383 -- is enabled for the compilation, we generate the instance body
3384 -- even if it is not within the main unit.
3386 -- Any other pragmas might also be inherited ???
3388 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
3389 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
3390 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
3392 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
3393 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
3397 Generate_Definition
(Act_Decl_Id
);
3399 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
3400 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
3402 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
3403 Check_Elab_Instantiation
(N
);
3406 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3408 -- Subject to change, pending on if other pragmas are inherited ???
3410 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3412 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
3414 if not Generic_Separately_Compiled
(Gen_Unit
) then
3415 Inherit_Context
(Gen_Decl
, N
);
3418 Restore_Private_Views
(Pack_Id
, False);
3420 -- If the context requires a full instantiation, mark node for
3421 -- subsequent construction of the body.
3423 if (Is_In_Main_Unit
(N
)
3424 or else Is_Inlined
(Act_Decl_Id
))
3425 and then (Operating_Mode
= Generate_Code
3426 or else (Operating_Mode
= Check_Semantics
3427 and then ASIS_Mode
))
3428 and then (Expander_Active
or else ASIS_Mode
)
3429 and then not ABE_Is_Certain
(N
)
3430 and then not Is_Eliminated
(Act_Decl_Id
)
3432 Pending_Instantiations
.Increment_Last
;
3433 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
3434 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
3435 Check_Forward_Instantiation
(Gen_Decl
);
3437 -- The wrapper package is always delayed, because it does
3438 -- not constitute a freeze point, but to insure that the
3439 -- freeze node is placed properly, it is created directly
3440 -- when instantiating the body (otherwise the freeze node
3441 -- might appear to early for nested instantiations).
3443 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3445 -- For ASIS purposes, indicate that the wrapper package has
3446 -- replaced the instantiation node.
3448 Rewrite
(N
, Unit
(Parent
(N
)));
3449 Set_Unit
(Parent
(N
), N
);
3452 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3454 -- Replace instance node for library-level instantiations
3455 -- of intrinsic subprograms, for ASIS use.
3457 Rewrite
(N
, Unit
(Parent
(N
)));
3458 Set_Unit
(Parent
(N
), N
);
3461 if Parent_Installed
then
3466 Generic_Renamings
.Set_Last
(0);
3467 Generic_Renamings_HTable
.Reset
;
3471 when Instantiation_Error
=>
3472 if Parent_Installed
then
3475 end Analyze_Subprogram_Instantiation
;
3477 -------------------------
3478 -- Get_Associated_Node --
3479 -------------------------
3481 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
3482 Assoc
: Node_Id
:= Associated_Node
(N
);
3485 if Nkind
(Assoc
) /= Nkind
(N
) then
3488 elsif Nkind
(Assoc
) = N_Aggregate
3489 or else Nkind
(Assoc
) = N_Extension_Aggregate
3494 -- If the node is part of an inner generic, it may itself have been
3495 -- remapped into a further generic copy. Associated_Node is otherwise
3496 -- used for the entity of the node, and will be of a different node
3497 -- kind, or else N has been rewritten as a literal or function call.
3499 while Present
(Associated_Node
(Assoc
))
3500 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
3502 Assoc
:= Associated_Node
(Assoc
);
3505 -- Follow and additional link in case the final node was rewritten.
3506 -- This can only happen with nested generic units.
3508 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
3509 and then Present
(Associated_Node
(Assoc
))
3510 and then (Nkind
(Associated_Node
(Assoc
)) = N_Function_Call
3512 Nkind
(Associated_Node
(Assoc
)) = N_Explicit_Dereference
3514 Nkind
(Associated_Node
(Assoc
)) = N_Integer_Literal
3516 Nkind
(Associated_Node
(Assoc
)) = N_Real_Literal
3518 Nkind
(Associated_Node
(Assoc
)) = N_String_Literal
)
3520 Assoc
:= Associated_Node
(Assoc
);
3525 end Get_Associated_Node
;
3527 -------------------------------------------
3528 -- Build_Instance_Compilation_Unit_Nodes --
3529 -------------------------------------------
3531 procedure Build_Instance_Compilation_Unit_Nodes
3536 Decl_Cunit
: Node_Id
;
3537 Body_Cunit
: Node_Id
;
3539 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
3540 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
3543 -- A new compilation unit node is built for the instance declaration
3546 Make_Compilation_Unit
(Sloc
(N
),
3547 Context_Items
=> Empty_List
,
3550 Make_Compilation_Unit_Aux
(Sloc
(N
)));
3552 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3553 Set_Body_Required
(Decl_Cunit
, True);
3555 -- We use the original instantiation compilation unit as the resulting
3556 -- compilation unit of the instance, since this is the main unit.
3558 Rewrite
(N
, Act_Body
);
3559 Body_Cunit
:= Parent
(N
);
3561 -- The two compilation unit nodes are linked by the Library_Unit field
3563 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
3564 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
3566 -- Preserve the private nature of the package if needed.
3568 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
3570 -- If the instance is not the main unit, its context, categorization,
3571 -- and elaboration entity are not relevant to the compilation.
3573 if Parent
(N
) /= Cunit
(Main_Unit
) then
3577 -- The context clause items on the instantiation, which are now
3578 -- attached to the body compilation unit (since the body overwrote
3579 -- the original instantiation node), semantically belong on the spec,
3580 -- so copy them there. It's harmless to leave them on the body as well.
3581 -- In fact one could argue that they belong in both places.
3583 Citem
:= First
(Context_Items
(Body_Cunit
));
3584 while Present
(Citem
) loop
3585 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
3589 -- Propagate categorization flags on packages, so that they appear
3590 -- in ali file for the spec of the unit.
3592 if Ekind
(New_Main
) = E_Package
then
3593 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
3594 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
3595 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
3596 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
3597 Set_Is_Remote_Call_Interface
3598 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
3601 -- Make entry in Units table, so that binder can generate call to
3602 -- elaboration procedure for body, if any.
3604 Make_Instance_Unit
(Body_Cunit
);
3605 Main_Unit_Entity
:= New_Main
;
3606 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
3608 -- Build elaboration entity, since the instance may certainly
3609 -- generate elaboration code requiring a flag for protection.
3611 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
3612 end Build_Instance_Compilation_Unit_Nodes
;
3614 -----------------------------------
3615 -- Check_Formal_Package_Instance --
3616 -----------------------------------
3618 -- If the formal has specific parameters, they must match those of the
3619 -- actual. Both of them are instances, and the renaming declarations
3620 -- for their formal parameters appear in the same order in both. The
3621 -- analyzed formal has been analyzed in the context of the current
3624 procedure Check_Formal_Package_Instance
3625 (Formal_Pack
: Entity_Id
;
3626 Actual_Pack
: Entity_Id
)
3628 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
3629 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
3634 procedure Check_Mismatch
(B
: Boolean);
3635 -- Common error routine for mismatch between the parameters of
3636 -- the actual instance and those of the formal package.
3638 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
3639 -- The formal may come from a nested formal package, and the actual
3640 -- may have been constant-folded. To determine whether the two denote
3641 -- the same entity we may have to traverse several definitions to
3642 -- recover the ultimate entity that they refer to.
3644 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
3645 -- Similarly, if the formal comes from a nested formal package, the
3646 -- actual may designate the formal through multiple renamings, which
3647 -- have to be followed to determine the original variable in question.
3649 --------------------
3650 -- Check_Mismatch --
3651 --------------------
3653 procedure Check_Mismatch
(B
: Boolean) is
3657 ("actual for & in actual instance does not match formal",
3658 Parent
(Actual_Pack
), E1
);
3662 --------------------------------
3663 -- Same_Instantiated_Constant --
3664 --------------------------------
3666 function Same_Instantiated_Constant
3667 (E1
, E2
: Entity_Id
) return Boolean
3672 while Present
(Ent
) loop
3676 elsif Ekind
(Ent
) /= E_Constant
then
3679 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
3680 if Entity
(Constant_Value
(Ent
)) = E1
then
3683 Ent
:= Entity
(Constant_Value
(Ent
));
3686 -- The actual may be a constant that has been folded. Recover
3689 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
3690 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
3697 end Same_Instantiated_Constant
;
3699 --------------------------------
3700 -- Same_Instantiated_Variable --
3701 --------------------------------
3703 function Same_Instantiated_Variable
3704 (E1
, E2
: Entity_Id
) return Boolean
3706 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
3707 -- Follow chain of renamings to the ultimate ancestor.
3709 ---------------------
3710 -- Original_Entity --
3711 ---------------------
3713 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
3718 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
3719 and then Present
(Renamed_Object
(Orig
))
3720 and then Is_Entity_Name
(Renamed_Object
(Orig
))
3722 Orig
:= Entity
(Renamed_Object
(Orig
));
3726 end Original_Entity
;
3728 -- Start of processing for Same_Instantiated_Variable
3731 return Ekind
(E1
) = Ekind
(E2
)
3732 and then Original_Entity
(E1
) = Original_Entity
(E2
);
3733 end Same_Instantiated_Variable
;
3735 -- Start of processing for Check_Formal_Package_Instance
3739 and then Present
(E2
)
3741 exit when Ekind
(E1
) = E_Package
3742 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
3744 if Is_Type
(E1
) then
3746 -- Subtypes must statically match. E1 and E2 are the
3747 -- local entities that are subtypes of the actuals.
3748 -- Itypes generated for other parameters need not be checked,
3749 -- the check will be performed on the parameters themselves.
3751 if not Is_Itype
(E1
)
3752 and then not Is_Itype
(E2
)
3756 or else Etype
(E1
) /= Etype
(E2
)
3757 or else not Subtypes_Statically_Match
(E1
, E2
));
3760 elsif Ekind
(E1
) = E_Constant
then
3762 -- IN parameters must denote the same static value, or
3763 -- the same constant, or the literal null.
3765 Expr1
:= Expression
(Parent
(E1
));
3767 if Ekind
(E2
) /= E_Constant
then
3768 Check_Mismatch
(True);
3771 Expr2
:= Expression
(Parent
(E2
));
3774 if Is_Static_Expression
(Expr1
) then
3776 if not Is_Static_Expression
(Expr2
) then
3777 Check_Mismatch
(True);
3779 elsif Is_Integer_Type
(Etype
(E1
)) then
3782 V1
: constant Uint
:= Expr_Value
(Expr1
);
3783 V2
: constant Uint
:= Expr_Value
(Expr2
);
3785 Check_Mismatch
(V1
/= V2
);
3788 elsif Is_Real_Type
(Etype
(E1
)) then
3790 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
3791 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
3793 Check_Mismatch
(V1
/= V2
);
3796 elsif Is_String_Type
(Etype
(E1
))
3797 and then Nkind
(Expr1
) = N_String_Literal
3800 if Nkind
(Expr2
) /= N_String_Literal
then
3801 Check_Mismatch
(True);
3804 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
3808 elsif Is_Entity_Name
(Expr1
) then
3809 if Is_Entity_Name
(Expr2
) then
3810 if Entity
(Expr1
) = Entity
(Expr2
) then
3814 (not Same_Instantiated_Constant
3815 (Entity
(Expr1
), Entity
(Expr2
)));
3818 Check_Mismatch
(True);
3821 elsif Is_Entity_Name
(Original_Node
(Expr1
))
3822 and then Is_Entity_Name
(Expr2
)
3824 Same_Instantiated_Constant
3825 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
3829 elsif Nkind
(Expr1
) = N_Null
then
3830 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
3833 Check_Mismatch
(True);
3836 elsif Ekind
(E1
) = E_Variable
then
3837 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
3839 elsif Ekind
(E1
) = E_Package
then
3841 (Ekind
(E1
) /= Ekind
(E2
)
3842 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
3844 elsif Is_Overloadable
(E1
) then
3846 -- Verify that the names of the entities match.
3847 -- What if actual is an attribute ???
3850 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
3853 raise Program_Error
;
3860 end Check_Formal_Package_Instance
;
3862 ---------------------------
3863 -- Check_Formal_Packages --
3864 ---------------------------
3866 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
3868 Formal_P
: Entity_Id
;
3871 -- Iterate through the declarations in the instance, looking for
3872 -- package renaming declarations that denote instances of formal
3873 -- packages. Stop when we find the renaming of the current package
3874 -- itself. The declaration for a formal package without a box is
3875 -- followed by an internal entity that repeats the instantiation.
3877 E
:= First_Entity
(P_Id
);
3878 while Present
(E
) loop
3879 if Ekind
(E
) = E_Package
then
3880 if Renamed_Object
(E
) = P_Id
then
3883 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
3886 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
3887 Formal_P
:= Next_Entity
(E
);
3888 Check_Formal_Package_Instance
(Formal_P
, E
);
3894 end Check_Formal_Packages
;
3896 ---------------------------------
3897 -- Check_Forward_Instantiation --
3898 ---------------------------------
3900 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
3902 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
3905 -- The instantiation appears before the generic body if we are in the
3906 -- scope of the unit containing the generic, either in its spec or in
3907 -- the package body. and before the generic body.
3909 if Ekind
(Gen_Comp
) = E_Package_Body
then
3910 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
3913 if In_Open_Scopes
(Gen_Comp
)
3914 and then No
(Corresponding_Body
(Decl
))
3919 and then not Is_Compilation_Unit
(S
)
3920 and then not Is_Child_Unit
(S
)
3922 if Ekind
(S
) = E_Package
then
3923 Set_Has_Forward_Instantiation
(S
);
3929 end Check_Forward_Instantiation
;
3931 ---------------------------
3932 -- Check_Generic_Actuals --
3933 ---------------------------
3935 -- The visibility of the actuals may be different between the
3936 -- point of generic instantiation and the instantiation of the body.
3938 procedure Check_Generic_Actuals
3939 (Instance
: Entity_Id
;
3940 Is_Formal_Box
: Boolean)
3945 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
3946 -- For a formal that is an array type, the component type is often
3947 -- a previous formal in the same unit. The privacy status of the
3948 -- component type will have been examined earlier in the traversal
3949 -- of the corresponding actuals, and this status should not be
3950 -- modified for the array type itself.
3951 -- To detect this case we have to rescan the list of formals, which
3952 -- is usually short enough to ignore the resulting inefficiency.
3954 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
3957 Prev
:= First_Entity
(Instance
);
3958 while Present
(Prev
) loop
3960 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
3961 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
3962 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
3972 end Denotes_Previous_Actual
;
3974 -- Start of processing for Check_Generic_Actuals
3977 E
:= First_Entity
(Instance
);
3978 while Present
(E
) loop
3980 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
3981 and then Scope
(Etype
(E
)) /= Instance
3982 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
3984 if Is_Array_Type
(E
)
3985 and then Denotes_Previous_Actual
(Component_Type
(E
))
3989 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
3991 Set_Is_Generic_Actual_Type
(E
, True);
3992 Set_Is_Hidden
(E
, False);
3993 Set_Is_Potentially_Use_Visible
(E
,
3996 -- We constructed the generic actual type as a subtype of
3997 -- the supplied type. This means that it normally would not
3998 -- inherit subtype specific attributes of the actual, which
3999 -- is wrong for the generic case.
4001 Astype
:= Ancestor_Subtype
(E
);
4005 -- can happen when E is an itype that is the full view of
4006 -- a private type completed, e.g. with a constrained array.
4008 Astype
:= Base_Type
(E
);
4011 Set_Size_Info
(E
, (Astype
));
4012 Set_RM_Size
(E
, RM_Size
(Astype
));
4013 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4015 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4016 Set_RM_Size
(E
, RM_Size
(Astype
));
4018 -- In nested instances, the base type of an access actual
4019 -- may itself be private, and need to be exchanged.
4021 elsif Is_Access_Type
(E
)
4022 and then Is_Private_Type
(Etype
(E
))
4025 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4028 elsif Ekind
(E
) = E_Package
then
4030 -- If this is the renaming for the current instance, we're done.
4031 -- Otherwise it is a formal package. If the corresponding formal
4032 -- was declared with a box, the (instantiations of the) generic
4033 -- formal part are also visible. Otherwise, ignore the entity
4034 -- created to validate the actuals.
4036 if Renamed_Object
(E
) = Instance
then
4039 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4042 -- The visibility of a formal of an enclosing generic is already
4045 elsif Denotes_Formal_Package
(E
) then
4048 elsif Present
(Associated_Formal_Package
(E
)) then
4049 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4050 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4053 Set_Is_Hidden
(E
, False);
4056 -- If this is a subprogram instance (in a wrapper package) the
4057 -- actual is fully visible.
4059 elsif Is_Wrapper_Package
(Instance
) then
4060 Set_Is_Hidden
(E
, False);
4063 Set_Is_Hidden
(E
, not Is_Formal_Box
);
4068 end Check_Generic_Actuals
;
4070 ------------------------------
4071 -- Check_Generic_Child_Unit --
4072 ------------------------------
4074 procedure Check_Generic_Child_Unit
4076 Parent_Installed
: in out Boolean)
4078 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4079 Gen_Par
: Entity_Id
:= Empty
;
4080 Inst_Par
: Entity_Id
;
4084 function Find_Generic_Child
4086 Id
: Node_Id
) return Entity_Id
;
4087 -- Search generic parent for possible child unit with the given name.
4089 function In_Enclosing_Instance
return Boolean;
4090 -- Within an instance of the parent, the child unit may be denoted
4091 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4092 -- scopes to locate a possible parent instantiation.
4094 ------------------------
4095 -- Find_Generic_Child --
4096 ------------------------
4098 function Find_Generic_Child
4100 Id
: Node_Id
) return Entity_Id
4105 -- If entity of name is already set, instance has already been
4106 -- resolved, e.g. in an enclosing instantiation.
4108 if Present
(Entity
(Id
)) then
4109 if Scope
(Entity
(Id
)) = Scop
then
4116 E
:= First_Entity
(Scop
);
4117 while Present
(E
) loop
4118 if Chars
(E
) = Chars
(Id
)
4119 and then Is_Child_Unit
(E
)
4121 if Is_Child_Unit
(E
)
4122 and then not Is_Visible_Child_Unit
(E
)
4125 ("generic child unit& is not visible", Gen_Id
, E
);
4137 end Find_Generic_Child
;
4139 ---------------------------
4140 -- In_Enclosing_Instance --
4141 ---------------------------
4143 function In_Enclosing_Instance
return Boolean is
4144 Enclosing_Instance
: Node_Id
;
4145 Instance_Decl
: Node_Id
;
4148 Enclosing_Instance
:= Current_Scope
;
4150 while Present
(Enclosing_Instance
) loop
4151 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4153 if Ekind
(Enclosing_Instance
) = E_Package
4154 and then Is_Generic_Instance
(Enclosing_Instance
)
4156 (Generic_Parent
(Specification
(Instance_Decl
)))
4158 -- Check whether the generic we are looking for is a child
4159 -- of this instance.
4161 E
:= Find_Generic_Child
4162 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4163 exit when Present
(E
);
4169 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
4181 Make_Expanded_Name
(Loc
,
4183 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
4184 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
4186 Set_Entity
(Gen_Id
, E
);
4187 Set_Etype
(Gen_Id
, Etype
(E
));
4188 Parent_Installed
:= False; -- Already in scope.
4191 end In_Enclosing_Instance
;
4193 -- Start of processing for Check_Generic_Child_Unit
4196 -- If the name of the generic is given by a selected component, it
4197 -- may be the name of a generic child unit, and the prefix is the name
4198 -- of an instance of the parent, in which case the child unit must be
4199 -- visible. If this instance is not in scope, it must be placed there
4200 -- and removed after instantiation, because what is being instantiated
4201 -- is not the original child, but the corresponding child present in
4202 -- the instance of the parent.
4204 -- If the child is instantiated within the parent, it can be given by
4205 -- a simple name. In this case the instance is already in scope, but
4206 -- the child generic must be recovered from the generic parent as well.
4208 if Nkind
(Gen_Id
) = N_Selected_Component
then
4209 S
:= Selector_Name
(Gen_Id
);
4210 Analyze
(Prefix
(Gen_Id
));
4211 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4213 if Ekind
(Inst_Par
) = E_Package
4214 and then Present
(Renamed_Object
(Inst_Par
))
4216 Inst_Par
:= Renamed_Object
(Inst_Par
);
4219 if Ekind
(Inst_Par
) = E_Package
then
4220 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
4221 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
4223 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
4225 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
4227 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
4230 elsif Ekind
(Inst_Par
) = E_Generic_Package
4231 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
4233 -- A formal package may be a real child package, and not the
4234 -- implicit instance within a parent. In this case the child is
4235 -- not visible and has to be retrieved explicitly as well.
4237 Gen_Par
:= Inst_Par
;
4240 if Present
(Gen_Par
) then
4242 -- The prefix denotes an instantiation. The entity itself
4243 -- may be a nested generic, or a child unit.
4245 E
:= Find_Generic_Child
(Gen_Par
, S
);
4248 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
4249 Set_Entity
(Gen_Id
, E
);
4250 Set_Etype
(Gen_Id
, Etype
(E
));
4252 Set_Etype
(S
, Etype
(E
));
4254 -- Indicate that this is a reference to the parent.
4256 if In_Extended_Main_Source_Unit
(Gen_Id
) then
4257 Set_Is_Instantiated
(Inst_Par
);
4260 -- A common mistake is to replicate the naming scheme of
4261 -- a hierarchy by instantiating a generic child directly,
4262 -- rather than the implicit child in a parent instance:
4264 -- generic .. package Gpar is ..
4265 -- generic .. package Gpar.Child is ..
4266 -- package Par is new Gpar ();
4269 -- package Par.Child is new Gpar.Child ();
4270 -- rather than Par.Child
4272 -- In this case the instantiation is within Par, which is
4273 -- an instance, but Gpar does not denote Par because we are
4274 -- not IN the instance of Gpar, so this is illegal. The test
4275 -- below recognizes this particular case.
4277 if Is_Child_Unit
(E
)
4278 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
4279 and then (not In_Instance
4280 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
4284 ("prefix of generic child unit must be instance of parent",
4288 if not In_Open_Scopes
(Inst_Par
)
4289 and then Nkind
(Parent
(Gen_Id
)) not in
4290 N_Generic_Renaming_Declaration
4292 Install_Parent
(Inst_Par
);
4293 Parent_Installed
:= True;
4297 -- If the generic parent does not contain an entity that
4298 -- corresponds to the selector, the instance doesn't either.
4299 -- Analyzing the node will yield the appropriate error message.
4300 -- If the entity is not a child unit, then it is an inner
4301 -- generic in the parent.
4309 if Is_Child_Unit
(Entity
(Gen_Id
))
4311 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4312 and then not In_Open_Scopes
(Inst_Par
)
4314 Install_Parent
(Inst_Par
);
4315 Parent_Installed
:= True;
4319 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
4321 -- Entity already present, analyze prefix, whose meaning may be
4322 -- an instance in the current context. If it is an instance of
4323 -- a relative within another, the proper parent may still have
4324 -- to be installed, if they are not of the same generation.
4326 Analyze
(Prefix
(Gen_Id
));
4327 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4329 if In_Enclosing_Instance
then
4332 elsif Present
(Entity
(Gen_Id
))
4333 and then Is_Child_Unit
(Entity
(Gen_Id
))
4334 and then not In_Open_Scopes
(Inst_Par
)
4336 Install_Parent
(Inst_Par
);
4337 Parent_Installed
:= True;
4340 elsif In_Enclosing_Instance
then
4342 -- The child unit is found in some enclosing scope
4349 -- If this is the renaming of the implicit child in a parent
4350 -- instance, recover the parent name and install it.
4352 if Is_Entity_Name
(Gen_Id
) then
4353 E
:= Entity
(Gen_Id
);
4355 if Is_Generic_Unit
(E
)
4356 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
4357 and then Is_Child_Unit
(Renamed_Object
(E
))
4358 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
4359 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
4362 New_Copy_Tree
(Name
(Parent
(E
))));
4363 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4365 if not In_Open_Scopes
(Inst_Par
) then
4366 Install_Parent
(Inst_Par
);
4367 Parent_Installed
:= True;
4370 -- If it is a child unit of a non-generic parent, it may be
4371 -- use-visible and given by a direct name. Install parent as
4374 elsif Is_Generic_Unit
(E
)
4375 and then Is_Child_Unit
(E
)
4377 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4378 and then not Is_Generic_Unit
(Scope
(E
))
4380 if not In_Open_Scopes
(Scope
(E
)) then
4381 Install_Parent
(Scope
(E
));
4382 Parent_Installed
:= True;
4387 end Check_Generic_Child_Unit
;
4389 -----------------------------
4390 -- Check_Hidden_Child_Unit --
4391 -----------------------------
4393 procedure Check_Hidden_Child_Unit
4395 Gen_Unit
: Entity_Id
;
4396 Act_Decl_Id
: Entity_Id
)
4398 Gen_Id
: constant Node_Id
:= Name
(N
);
4401 if Is_Child_Unit
(Gen_Unit
)
4402 and then Is_Child_Unit
(Act_Decl_Id
)
4403 and then Nkind
(Gen_Id
) = N_Expanded_Name
4404 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
4405 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
4407 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
4409 ("generic unit & is implicitly declared in &",
4410 Defining_Unit_Name
(N
), Gen_Unit
);
4411 Error_Msg_N
("\instance must have different name",
4412 Defining_Unit_Name
(N
));
4414 end Check_Hidden_Child_Unit
;
4416 ------------------------
4417 -- Check_Private_View --
4418 ------------------------
4420 procedure Check_Private_View
(N
: Node_Id
) is
4421 T
: constant Entity_Id
:= Etype
(N
);
4425 -- Exchange views if the type was not private in the generic but is
4426 -- private at the point of instantiation. Do not exchange views if
4427 -- the scope of the type is in scope. This can happen if both generic
4428 -- and instance are sibling units, or if type is defined in a parent.
4429 -- In this case the visibility of the type will be correct for all
4433 BT
:= Base_Type
(T
);
4435 if Is_Private_Type
(T
)
4436 and then not Has_Private_View
(N
)
4437 and then Present
(Full_View
(T
))
4438 and then not In_Open_Scopes
(Scope
(T
))
4440 -- In the generic, the full type was visible. Save the
4441 -- private entity, for subsequent exchange.
4445 elsif Has_Private_View
(N
)
4446 and then not Is_Private_Type
(T
)
4447 and then not Has_Been_Exchanged
(T
)
4448 and then Etype
(Get_Associated_Node
(N
)) /= T
4450 -- Only the private declaration was visible in the generic. If
4451 -- the type appears in a subtype declaration, the subtype in the
4452 -- instance must have a view compatible with that of its parent,
4453 -- which must be exchanged (see corresponding code in Restore_
4454 -- Private_Views). Otherwise, if the type is defined in a parent
4455 -- unit, leave full visibility within instance, which is safe.
4457 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
4458 and then not Is_Private_Type
(Base_Type
(T
))
4459 and then Comes_From_Source
(Base_Type
(T
))
4463 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
4464 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
4466 Append_Elmt
(T
, Exchanged_Views
);
4467 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
4470 -- For composite types with inconsistent representation
4471 -- exchange component types accordingly.
4473 elsif Is_Access_Type
(T
)
4474 and then Is_Private_Type
(Designated_Type
(T
))
4475 and then not Has_Private_View
(N
)
4476 and then Present
(Full_View
(Designated_Type
(T
)))
4478 Switch_View
(Designated_Type
(T
));
4480 elsif Is_Array_Type
(T
)
4481 and then Is_Private_Type
(Component_Type
(T
))
4482 and then not Has_Private_View
(N
)
4483 and then Present
(Full_View
(Component_Type
(T
)))
4485 Switch_View
(Component_Type
(T
));
4487 elsif Is_Private_Type
(T
)
4488 and then Present
(Full_View
(T
))
4489 and then Is_Array_Type
(Full_View
(T
))
4490 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
4494 -- Finally, a non-private subtype may have a private base type,
4495 -- which must be exchanged for consistency. This can happen when
4496 -- instantiating a package body, when the scope stack is empty
4497 -- but in fact the subtype and the base type are declared in an
4500 elsif not Is_Private_Type
(T
)
4501 and then not Has_Private_View
(N
)
4502 and then Is_Private_Type
(Base_Type
(T
))
4503 and then Present
(Full_View
(BT
))
4504 and then not Is_Generic_Type
(BT
)
4505 and then not In_Open_Scopes
(BT
)
4507 Append_Elmt
(Full_View
(BT
), Exchanged_Views
);
4508 Exchange_Declarations
(BT
);
4511 end Check_Private_View
;
4513 --------------------------
4514 -- Contains_Instance_Of --
4515 --------------------------
4517 function Contains_Instance_Of
4520 N
: Node_Id
) return Boolean
4528 -- Verify that there are no circular instantiations. We check whether
4529 -- the unit contains an instance of the current scope or some enclosing
4530 -- scope (in case one of the instances appears in a subunit). Longer
4531 -- circularities involving subunits might seem too pathological to
4532 -- consider, but they were not too pathological for the authors of
4533 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4534 -- enclosing generic scopes as containing an instance.
4537 -- Within a generic subprogram body, the scope is not generic, to
4538 -- allow for recursive subprograms. Use the declaration to determine
4539 -- whether this is a generic unit.
4541 if Ekind
(Scop
) = E_Generic_Package
4542 or else (Is_Subprogram
(Scop
)
4543 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
4544 N_Generic_Subprogram_Declaration
)
4546 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
4548 while Present
(Elmt
) loop
4549 if Node
(Elmt
) = Scop
then
4550 Error_Msg_Node_2
:= Inner
;
4552 ("circular Instantiation: & instantiated within &!",
4556 elsif Node
(Elmt
) = Inner
then
4559 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
4560 Error_Msg_Node_2
:= Inner
;
4562 ("circular Instantiation: & instantiated within &!",
4570 -- Indicate that Inner is being instantiated within Scop.
4572 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
4575 if Scop
= Standard_Standard
then
4578 Scop
:= Scope
(Scop
);
4583 end Contains_Instance_Of
;
4585 -----------------------
4586 -- Copy_Generic_Node --
4587 -----------------------
4589 function Copy_Generic_Node
4591 Parent_Id
: Node_Id
;
4592 Instantiating
: Boolean) return Node_Id
4597 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
4598 -- Check the given value of one of the Fields referenced by the
4599 -- current node to determine whether to copy it recursively. The
4600 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4601 -- value (Sloc, Uint, Char) in which case it need not be copied.
4603 procedure Copy_Descendants
;
4604 -- Common utility for various nodes.
4606 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
4607 -- Make copy of element list.
4609 function Copy_Generic_List
4611 Parent_Id
: Node_Id
) return List_Id
;
4612 -- Apply Copy_Node recursively to the members of a node list.
4614 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
4615 -- True if an identifier is part of the defining program unit name
4616 -- of a child unit. The entity of such an identifier must be kept
4617 -- (for ASIS use) even though as the name of an enclosing generic
4618 -- it would otherwise not be preserved in the generic tree.
4620 ----------------------
4621 -- Copy_Descendants --
4622 ----------------------
4624 procedure Copy_Descendants
is
4626 use Atree
.Unchecked_Access
;
4627 -- This code section is part of the implementation of an untyped
4628 -- tree traversal, so it needs direct access to node fields.
4631 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
4632 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
4633 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
4634 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
4635 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
4636 end Copy_Descendants
;
4638 -----------------------------
4639 -- Copy_Generic_Descendant --
4640 -----------------------------
4642 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
4644 if D
= Union_Id
(Empty
) then
4647 elsif D
in Node_Range
then
4649 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
4651 elsif D
in List_Range
then
4652 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
4654 elsif D
in Elist_Range
then
4655 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
4657 -- Nothing else is copyable (e.g. Uint values), return as is
4662 end Copy_Generic_Descendant
;
4664 ------------------------
4665 -- Copy_Generic_Elist --
4666 ------------------------
4668 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
4675 M
:= First_Elmt
(E
);
4676 while Present
(M
) loop
4678 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
4687 end Copy_Generic_Elist
;
4689 -----------------------
4690 -- Copy_Generic_List --
4691 -----------------------
4693 function Copy_Generic_List
4695 Parent_Id
: Node_Id
) return List_Id
4703 Set_Parent
(New_L
, Parent_Id
);
4706 while Present
(N
) loop
4707 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
4716 end Copy_Generic_List
;
4718 ---------------------------
4719 -- In_Defining_Unit_Name --
4720 ---------------------------
4722 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
4724 return Present
(Parent
(Nam
))
4725 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
4727 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
4728 and then In_Defining_Unit_Name
(Parent
(Nam
))));
4729 end In_Defining_Unit_Name
;
4731 -- Start of processing for Copy_Generic_Node
4738 New_N
:= New_Copy
(N
);
4740 if Instantiating
then
4741 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
4744 if not Is_List_Member
(N
) then
4745 Set_Parent
(New_N
, Parent_Id
);
4748 -- If defining identifier, then all fields have been copied already
4750 if Nkind
(New_N
) in N_Entity
then
4753 -- Special casing for identifiers and other entity names and operators
4755 elsif Nkind
(New_N
) = N_Identifier
4756 or else Nkind
(New_N
) = N_Character_Literal
4757 or else Nkind
(New_N
) = N_Expanded_Name
4758 or else Nkind
(New_N
) = N_Operator_Symbol
4759 or else Nkind
(New_N
) in N_Op
4761 if not Instantiating
then
4763 -- Link both nodes in order to assign subsequently the
4764 -- entity of the copy to the original node, in case this
4765 -- is a global reference.
4767 Set_Associated_Node
(N
, New_N
);
4769 -- If we are within an instantiation, this is a nested generic
4770 -- that has already been analyzed at the point of definition. We
4771 -- must preserve references that were global to the enclosing
4772 -- parent at that point. Other occurrences, whether global or
4773 -- local to the current generic, must be resolved anew, so we
4774 -- reset the entity in the generic copy. A global reference has
4775 -- a smaller depth than the parent, or else the same depth in
4776 -- case both are distinct compilation units.
4778 -- It is also possible for Current_Instantiated_Parent to be
4779 -- defined, and for this not to be a nested generic, namely
4780 -- if the unit is loaded through Rtsfind. In that case, the
4781 -- entity of New_N is only a link to the associated node, and
4782 -- not a defining occurrence.
4784 -- The entities for parent units in the defining_program_unit
4785 -- of a generic child unit are established when the context of
4786 -- the unit is first analyzed, before the generic copy is made.
4787 -- They are preserved in the copy for use in ASIS queries.
4789 Ent
:= Entity
(New_N
);
4791 if No
(Current_Instantiated_Parent
.Gen_Id
) then
4793 or else Nkind
(Ent
) /= N_Defining_Identifier
4794 or else not In_Defining_Unit_Name
(N
)
4796 Set_Associated_Node
(New_N
, Empty
);
4801 not (Nkind
(Ent
) = N_Defining_Identifier
4803 Nkind
(Ent
) = N_Defining_Character_Literal
4805 Nkind
(Ent
) = N_Defining_Operator_Symbol
)
4806 or else No
(Scope
(Ent
))
4807 or else Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
4808 or else (Scope_Depth
(Scope
(Ent
)) >
4809 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
4811 Get_Source_Unit
(Ent
) =
4812 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
4814 Set_Associated_Node
(New_N
, Empty
);
4817 -- Case of instantiating identifier or some other name or operator
4820 -- If the associated node is still defined, the entity in
4821 -- it is global, and must be copied to the instance.
4822 -- If this copy is being made for a body to inline, it is
4823 -- applied to an instantiated tree, and the entity is already
4824 -- present and must be also preserved.
4827 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
4829 if Present
(Assoc
) then
4830 if Nkind
(Assoc
) = Nkind
(N
) then
4831 Set_Entity
(New_N
, Entity
(Assoc
));
4832 Check_Private_View
(N
);
4834 elsif Nkind
(Assoc
) = N_Function_Call
then
4835 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
4837 elsif (Nkind
(Assoc
) = N_Defining_Identifier
4838 or else Nkind
(Assoc
) = N_Defining_Character_Literal
4839 or else Nkind
(Assoc
) = N_Defining_Operator_Symbol
)
4840 and then Expander_Active
4842 -- Inlining case: we are copying a tree that contains
4843 -- global entities, which are preserved in the copy
4844 -- to be used for subsequent inlining.
4849 Set_Entity
(New_N
, Empty
);
4855 -- For expanded name, we must copy the Prefix and Selector_Name
4857 if Nkind
(N
) = N_Expanded_Name
then
4859 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
4861 Set_Selector_Name
(New_N
,
4862 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
4864 -- For operators, we must copy the right operand
4866 elsif Nkind
(N
) in N_Op
then
4867 Set_Right_Opnd
(New_N
,
4868 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
4870 -- And for binary operators, the left operand as well
4872 if Nkind
(N
) in N_Binary_Op
then
4873 Set_Left_Opnd
(New_N
,
4874 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
4878 -- Special casing for stubs
4880 elsif Nkind
(N
) in N_Body_Stub
then
4882 -- In any case, we must copy the specification or defining
4883 -- identifier as appropriate.
4885 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4886 Set_Specification
(New_N
,
4887 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
4890 Set_Defining_Identifier
(New_N
,
4892 (Defining_Identifier
(N
), New_N
, Instantiating
));
4895 -- If we are not instantiating, then this is where we load and
4896 -- analyze subunits, i.e. at the point where the stub occurs. A
4897 -- more permissivle system might defer this analysis to the point
4898 -- of instantiation, but this seems to complicated for now.
4900 if not Instantiating
then
4902 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
4904 Unum
: Unit_Number_Type
;
4910 (Load_Name
=> Subunit_Name
,
4915 -- If the proper body is not found, a warning message will
4916 -- be emitted when analyzing the stub, or later at the the
4917 -- point of instantiation. Here we just leave the stub as is.
4919 if Unum
= No_Unit
then
4920 Subunits_Missing
:= True;
4921 goto Subunit_Not_Found
;
4924 Subunit
:= Cunit
(Unum
);
4926 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
4927 Error_Msg_Sloc
:= Sloc
(N
);
4929 ("expected SEPARATE subunit to complete stub at#,"
4930 & " found child unit", Subunit
);
4931 goto Subunit_Not_Found
;
4934 -- We must create a generic copy of the subunit, in order
4935 -- to perform semantic analysis on it, and we must replace
4936 -- the stub in the original generic unit with the subunit,
4937 -- in order to preserve non-local references within.
4939 -- Only the proper body needs to be copied. Library_Unit and
4940 -- context clause are simply inherited by the generic copy.
4941 -- Note that the copy (which may be recursive if there are
4942 -- nested subunits) must be done first, before attaching it
4943 -- to the enclosing generic.
4947 (Proper_Body
(Unit
(Subunit
)),
4948 Empty
, Instantiating
=> False);
4950 -- Now place the original proper body in the original
4951 -- generic unit. This is a body, not a compilation unit.
4953 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
4954 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
4955 Set_Was_Originally_Stub
(N
);
4957 -- Finally replace the body of the subunit with its copy,
4958 -- and make this new subunit into the library unit of the
4959 -- generic copy, which does not have stubs any longer.
4961 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
4962 Set_Library_Unit
(New_N
, Subunit
);
4963 Inherit_Context
(Unit
(Subunit
), N
);
4966 -- If we are instantiating, this must be an error case, since
4967 -- otherwise we would have replaced the stub node by the proper
4968 -- body that corresponds. So just ignore it in the copy (i.e.
4969 -- we have copied it, and that is good enough).
4975 <<Subunit_Not_Found
>> null;
4977 -- If the node is a compilation unit, it is the subunit of a stub,
4978 -- which has been loaded already (see code below). In this case,
4979 -- the library unit field of N points to the parent unit (which
4980 -- is a compilation unit) and need not (and cannot!) be copied.
4982 -- When the proper body of the stub is analyzed, thie library_unit
4983 -- link is used to establish the proper context (see sem_ch10).
4985 -- The other fields of a compilation unit are copied as usual
4987 elsif Nkind
(N
) = N_Compilation_Unit
then
4989 -- This code can only be executed when not instantiating, because
4990 -- in the copy made for an instantiation, the compilation unit
4991 -- node has disappeared at the point that a stub is replaced by
4994 pragma Assert
(not Instantiating
);
4996 Set_Context_Items
(New_N
,
4997 Copy_Generic_List
(Context_Items
(N
), New_N
));
5000 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5002 Set_First_Inlined_Subprogram
(New_N
,
5004 (First_Inlined_Subprogram
(N
), New_N
, False));
5006 Set_Aux_Decls_Node
(New_N
,
5007 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5009 -- For an assignment node, the assignment is known to be semantically
5010 -- legal if we are instantiating the template. This avoids incorrect
5011 -- diagnostics in generated code.
5013 elsif Nkind
(N
) = N_Assignment_Statement
then
5015 -- Copy name and expression fields in usual manner
5018 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5020 Set_Expression
(New_N
,
5021 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5023 if Instantiating
then
5024 Set_Assignment_OK
(Name
(New_N
), True);
5027 elsif Nkind
(N
) = N_Aggregate
5028 or else Nkind
(N
) = N_Extension_Aggregate
5031 if not Instantiating
then
5032 Set_Associated_Node
(N
, New_N
);
5035 if Present
(Get_Associated_Node
(N
))
5036 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5038 -- In the generic the aggregate has some composite type. If at
5039 -- the point of instantiation the type has a private view,
5040 -- install the full view (and that of its ancestors, if any).
5043 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5048 and then Is_Private_Type
(T
)
5054 and then Is_Tagged_Type
(T
)
5055 and then Is_Derived_Type
(T
)
5057 Rt
:= Root_Type
(T
);
5062 if Is_Private_Type
(T
) then
5073 -- Do not copy the associated node, which points to
5074 -- the generic copy of the aggregate.
5077 use Atree
.Unchecked_Access
;
5078 -- This code section is part of the implementation of an untyped
5079 -- tree traversal, so it needs direct access to node fields.
5082 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5083 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5084 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5085 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5088 -- Allocators do not have an identifier denoting the access type,
5089 -- so we must locate it through the expression to check whether
5090 -- the views are consistent.
5092 elsif Nkind
(N
) = N_Allocator
5093 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5094 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5095 and then Instantiating
5098 T
: constant Node_Id
:=
5099 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5104 -- Retrieve the allocator node in the generic copy.
5106 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5108 and then Is_Private_Type
(Acc_T
)
5110 Switch_View
(Acc_T
);
5117 -- For a proper body, we must catch the case of a proper body that
5118 -- replaces a stub. This represents the point at which a separate
5119 -- compilation unit, and hence template file, may be referenced, so
5120 -- we must make a new source instantiation entry for the template
5121 -- of the subunit, and ensure that all nodes in the subunit are
5122 -- adjusted using this new source instantiation entry.
5124 elsif Nkind
(N
) in N_Proper_Body
then
5126 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
5129 if Instantiating
and then Was_Originally_Stub
(N
) then
5130 Create_Instantiation_Source
5131 (Instantiation_Node
,
5132 Defining_Entity
(N
),
5137 -- Now copy the fields of the proper body, using the new
5138 -- adjustment factor if one was needed as per test above.
5142 -- Restore the original adjustment factor in case changed
5144 S_Adjustment
:= Save_Adjustment
;
5147 -- Don't copy Ident or Comment pragmas, since the comment belongs
5148 -- to the generic unit, not to the instantiating unit.
5150 elsif Nkind
(N
) = N_Pragma
5151 and then Instantiating
5154 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(Chars
(N
));
5157 if Prag_Id
= Pragma_Ident
5158 or else Prag_Id
= Pragma_Comment
5160 New_N
:= Make_Null_Statement
(Sloc
(N
));
5167 elsif Nkind
(N
) = N_Integer_Literal
5168 or else Nkind
(N
) = N_Real_Literal
5170 -- No descendant fields need traversing
5174 -- For the remaining nodes, copy recursively their descendants
5180 and then Nkind
(N
) = N_Subprogram_Body
5182 Set_Generic_Parent
(Specification
(New_N
), N
);
5187 end Copy_Generic_Node
;
5189 ----------------------------
5190 -- Denotes_Formal_Package --
5191 ----------------------------
5193 function Denotes_Formal_Package
5195 On_Exit
: Boolean := False) return Boolean
5198 Scop
: constant Entity_Id
:= Scope
(Pack
);
5205 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
5207 Par
:= Current_Instantiated_Parent
.Act_Id
;
5210 if Ekind
(Scop
) = E_Generic_Package
5211 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
5212 N_Generic_Subprogram_Declaration
5216 elsif Nkind
(Parent
(Pack
)) = N_Formal_Package_Declaration
then
5223 -- Check whether this package is associated with a formal
5224 -- package of the enclosing instantiation. Iterate over the
5225 -- list of renamings.
5227 E
:= First_Entity
(Par
);
5228 while Present
(E
) loop
5229 if Ekind
(E
) /= E_Package
5230 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
5233 elsif Renamed_Object
(E
) = Par
then
5236 elsif Renamed_Object
(E
) = Pack
then
5245 end Denotes_Formal_Package
;
5251 procedure End_Generic
is
5253 -- ??? More things could be factored out in this
5254 -- routine. Should probably be done at a later stage.
5256 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
5257 Generic_Flags
.Decrement_Last
;
5259 Expander_Mode_Restore
;
5262 ----------------------
5263 -- Find_Actual_Type --
5264 ----------------------
5266 function Find_Actual_Type
5268 Gen_Scope
: Entity_Id
) return Entity_Id
5273 if not Is_Child_Unit
(Gen_Scope
) then
5274 return Get_Instance_Of
(Typ
);
5276 elsif not Is_Generic_Type
(Typ
)
5277 or else Scope
(Typ
) = Gen_Scope
5279 return Get_Instance_Of
(Typ
);
5282 T
:= Current_Entity
(Typ
);
5283 while Present
(T
) loop
5284 if In_Open_Scopes
(Scope
(T
)) then
5293 end Find_Actual_Type
;
5295 ----------------------------
5296 -- Freeze_Subprogram_Body --
5297 ----------------------------
5299 procedure Freeze_Subprogram_Body
5300 (Inst_Node
: Node_Id
;
5302 Pack_Id
: Entity_Id
)
5305 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
5306 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
5311 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
5312 -- Yields True if N1 and N2 appear in the same compilation unit,
5313 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5314 -- traversal of the tree for the unit.
5316 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
5317 -- Find innermost package body that encloses the given node, and which
5318 -- is not a compilation unit. Freeze nodes for the instance, or for its
5319 -- enclosing body, may be inserted after the enclosing_body of the
5322 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
5323 -- Find entity for given package body, and locate or create a freeze
5326 function True_Parent
(N
: Node_Id
) return Node_Id
;
5327 -- For a subunit, return parent of corresponding stub.
5333 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
5339 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
5340 -- Find distance from given node to enclosing compilation unit.
5346 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
5349 and then Nkind
(P
) /= N_Compilation_Unit
5351 P
:= True_Parent
(P
);
5356 -- Start of procesing for Earlier
5359 Find_Depth
(P1
, D1
);
5360 Find_Depth
(P2
, D2
);
5370 P1
:= True_Parent
(P1
);
5375 P2
:= True_Parent
(P2
);
5379 -- At this point P1 and P2 are at the same distance from the root.
5380 -- We examine their parents until we find a common declarative
5381 -- list, at which point we can establish their relative placement
5382 -- by comparing their ultimate slocs. If we reach the root,
5383 -- N1 and N2 do not descend from the same declarative list (e.g.
5384 -- one is nested in the declarative part and the other is in a block
5385 -- in the statement part) and the earlier one is already frozen.
5387 while not Is_List_Member
(P1
)
5388 or else not Is_List_Member
(P2
)
5389 or else List_Containing
(P1
) /= List_Containing
(P2
)
5391 P1
:= True_Parent
(P1
);
5392 P2
:= True_Parent
(P2
);
5394 if Nkind
(Parent
(P1
)) = N_Subunit
then
5395 P1
:= Corresponding_Stub
(Parent
(P1
));
5398 if Nkind
(Parent
(P2
)) = N_Subunit
then
5399 P2
:= Corresponding_Stub
(Parent
(P2
));
5408 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
5411 --------------------
5412 -- Enclosing_Body --
5413 --------------------
5415 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
5416 P
: Node_Id
:= Parent
(N
);
5420 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
5422 if Nkind
(P
) = N_Package_Body
then
5424 if Nkind
(Parent
(P
)) = N_Subunit
then
5425 return Corresponding_Stub
(Parent
(P
));
5431 P
:= True_Parent
(P
);
5437 -------------------------
5438 -- Package_Freeze_Node --
5439 -------------------------
5441 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
5445 if Nkind
(B
) = N_Package_Body
then
5446 Id
:= Corresponding_Spec
(B
);
5448 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
5449 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
5452 Ensure_Freeze_Node
(Id
);
5453 return Freeze_Node
(Id
);
5454 end Package_Freeze_Node
;
5460 function True_Parent
(N
: Node_Id
) return Node_Id
is
5462 if Nkind
(Parent
(N
)) = N_Subunit
then
5463 return Parent
(Corresponding_Stub
(Parent
(N
)));
5469 -- Start of processing of Freeze_Subprogram_Body
5472 -- If the instance and the generic body appear within the same
5473 -- unit, and the instance preceeds the generic, the freeze node for
5474 -- the instance must appear after that of the generic. If the generic
5475 -- is nested within another instance I2, then current instance must
5476 -- be frozen after I2. In both cases, the freeze nodes are those of
5477 -- enclosing packages. Otherwise, the freeze node is placed at the end
5478 -- of the current declarative part.
5480 Enc_G
:= Enclosing_Body
(Gen_Body
);
5481 Enc_I
:= Enclosing_Body
(Inst_Node
);
5482 Ensure_Freeze_Node
(Pack_Id
);
5483 F_Node
:= Freeze_Node
(Pack_Id
);
5485 if Is_Generic_Instance
(Par
)
5486 and then Present
(Freeze_Node
(Par
))
5488 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
5490 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
5492 -- The parent was a premature instantiation. Insert freeze
5493 -- node at the end the current declarative part.
5495 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5498 Insert_After
(Freeze_Node
(Par
), F_Node
);
5501 -- The body enclosing the instance should be frozen after the body
5502 -- that includes the generic, because the body of the instance may
5503 -- make references to entities therein. If the two are not in the
5504 -- same declarative part, or if the one enclosing the instance is
5505 -- frozen already, freeze the instance at the end of the current
5506 -- declarative part.
5508 elsif Is_Generic_Instance
(Par
)
5509 and then Present
(Freeze_Node
(Par
))
5510 and then Present
(Enc_I
)
5512 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
5514 (Nkind
(Enc_I
) = N_Package_Body
5516 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
5518 -- The enclosing package may contain several instances. Rather
5519 -- than computing the earliest point at which to insert its
5520 -- freeze node, we place it at the end of the declarative part
5521 -- of the parent of the generic.
5523 Insert_After_Last_Decl
5524 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
5527 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5529 elsif Present
(Enc_G
)
5530 and then Present
(Enc_I
)
5531 and then Enc_G
/= Enc_I
5532 and then Earlier
(Inst_Node
, Gen_Body
)
5534 if Nkind
(Enc_G
) = N_Package_Body
then
5535 E_G_Id
:= Corresponding_Spec
(Enc_G
);
5536 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
5538 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
5541 -- Freeze package that encloses instance, and place node after
5542 -- package that encloses generic. If enclosing package is already
5543 -- frozen we have to assume it is at the proper place. This may
5544 -- be a potential ABE that requires dynamic checking.
5546 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
5548 -- Freeze enclosing subunit before instance
5550 Ensure_Freeze_Node
(E_G_Id
);
5552 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
5553 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
5556 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5559 -- If none of the above, insert freeze node at the end of the
5560 -- current declarative part.
5562 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5564 end Freeze_Subprogram_Body
;
5570 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
5572 return Generic_Renamings
.Table
(E
).Gen_Id
;
5575 ---------------------
5576 -- Get_Instance_Of --
5577 ---------------------
5579 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
5580 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
5583 if Res
/= Assoc_Null
then
5584 return Generic_Renamings
.Table
(Res
).Act_Id
;
5586 -- On exit, entity is not instantiated: not a generic parameter,
5587 -- or else parameter of an inner generic unit.
5591 end Get_Instance_Of
;
5593 ------------------------------------
5594 -- Get_Package_Instantiation_Node --
5595 ------------------------------------
5597 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
5598 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
5602 -- If the instantiation is a compilation unit that does not need a
5603 -- body then the instantiation node has been rewritten as a package
5604 -- declaration for the instance, and we return the original node.
5606 -- If it is a compilation unit and the instance node has not been
5607 -- rewritten, then it is still the unit of the compilation. Finally,
5608 -- if a body is present, this is a parent of the main unit whose body
5609 -- has been compiled for inlining purposes, and the instantiation node
5610 -- has been rewritten with the instance body.
5612 -- Otherwise the instantiation node appears after the declaration.
5613 -- If the entity is a formal package, the declaration may have been
5614 -- rewritten as a generic declaration (in the case of a formal with a
5615 -- box) or left as a formal package declaration if it has actuals, and
5616 -- is found with a forward search.
5618 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
5619 if Nkind
(Decl
) = N_Package_Declaration
5620 and then Present
(Corresponding_Body
(Decl
))
5622 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
5625 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
5626 return Original_Node
(Decl
);
5628 return Unit
(Parent
(Decl
));
5631 elsif Nkind
(Decl
) = N_Generic_Package_Declaration
5632 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
5634 return Original_Node
(Decl
);
5637 Inst
:= Next
(Decl
);
5638 while Nkind
(Inst
) /= N_Package_Instantiation
5639 and then Nkind
(Inst
) /= N_Formal_Package_Declaration
5646 end Get_Package_Instantiation_Node
;
5648 ------------------------
5649 -- Has_Been_Exchanged --
5650 ------------------------
5652 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
5653 Next
: Elmt_Id
:= First_Elmt
(Exchanged_Views
);
5656 while Present
(Next
) loop
5657 if Full_View
(Node
(Next
)) = E
then
5665 end Has_Been_Exchanged
;
5671 function Hash
(F
: Entity_Id
) return HTable_Range
is
5673 return HTable_Range
(F
mod HTable_Size
);
5676 ------------------------
5677 -- Hide_Current_Scope --
5678 ------------------------
5680 procedure Hide_Current_Scope
is
5681 C
: constant Entity_Id
:= Current_Scope
;
5685 Set_Is_Hidden_Open_Scope
(C
);
5686 E
:= First_Entity
(C
);
5688 while Present
(E
) loop
5689 if Is_Immediately_Visible
(E
) then
5690 Set_Is_Immediately_Visible
(E
, False);
5691 Append_Elmt
(E
, Hidden_Entities
);
5697 -- Make the scope name invisible as well. This is necessary, but
5698 -- might conflict with calls to Rtsfind later on, in case the scope
5699 -- is a predefined one. There is no clean solution to this problem, so
5700 -- for now we depend on the user not redefining Standard itself in one
5701 -- of the parent units.
5703 if Is_Immediately_Visible
(C
)
5704 and then C
/= Standard_Standard
5706 Set_Is_Immediately_Visible
(C
, False);
5707 Append_Elmt
(C
, Hidden_Entities
);
5710 end Hide_Current_Scope
;
5716 procedure Init_Env
is
5717 Saved
: Instance_Env
;
5720 Saved
.Ada_Version
:= Ada_Version
;
5721 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
5722 Saved
.Exchanged_Views
:= Exchanged_Views
;
5723 Saved
.Hidden_Entities
:= Hidden_Entities
;
5724 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
5725 Instance_Envs
.Increment_Last
;
5726 Instance_Envs
.Table
(Instance_Envs
.Last
) := Saved
;
5728 Exchanged_Views
:= New_Elmt_List
;
5729 Hidden_Entities
:= New_Elmt_List
;
5731 -- Make dummy entry for Instantiated parent. If generic unit is
5732 -- legal, this is set properly in Set_Instance_Env.
5734 Current_Instantiated_Parent
:=
5735 (Current_Scope
, Current_Scope
, Assoc_Null
);
5738 ------------------------------
5739 -- In_Same_Declarative_Part --
5740 ------------------------------
5742 function In_Same_Declarative_Part
5744 Inst
: Node_Id
) return Boolean
5746 Decls
: constant Node_Id
:= Parent
(F_Node
);
5747 Nod
: Node_Id
:= Parent
(Inst
);
5750 while Present
(Nod
) loop
5754 elsif Nkind
(Nod
) = N_Subprogram_Body
5755 or else Nkind
(Nod
) = N_Package_Body
5756 or else Nkind
(Nod
) = N_Task_Body
5757 or else Nkind
(Nod
) = N_Protected_Body
5758 or else Nkind
(Nod
) = N_Block_Statement
5762 elsif Nkind
(Nod
) = N_Subunit
then
5763 Nod
:= Corresponding_Stub
(Nod
);
5765 elsif Nkind
(Nod
) = N_Compilation_Unit
then
5768 Nod
:= Parent
(Nod
);
5773 end In_Same_Declarative_Part
;
5775 ---------------------
5776 -- Inherit_Context --
5777 ---------------------
5779 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
5780 Current_Context
: List_Id
;
5781 Current_Unit
: Node_Id
;
5786 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
5788 -- The inherited context is attached to the enclosing compilation
5789 -- unit. This is either the main unit, or the declaration for the
5790 -- main unit (in case the instantation appears within the package
5791 -- declaration and the main unit is its body).
5793 Current_Unit
:= Parent
(Inst
);
5794 while Present
(Current_Unit
)
5795 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
5797 Current_Unit
:= Parent
(Current_Unit
);
5800 Current_Context
:= Context_Items
(Current_Unit
);
5802 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
5803 while Present
(Item
) loop
5804 if Nkind
(Item
) = N_With_Clause
then
5805 New_I
:= New_Copy
(Item
);
5806 Set_Implicit_With
(New_I
, True);
5807 Append
(New_I
, Current_Context
);
5813 end Inherit_Context
;
5819 procedure Initialize
is
5821 Generic_Renamings
.Init
;
5824 Generic_Renamings_HTable
.Reset
;
5825 Circularity_Detected
:= False;
5826 Exchanged_Views
:= No_Elist
;
5827 Hidden_Entities
:= No_Elist
;
5830 ----------------------------
5831 -- Insert_After_Last_Decl --
5832 ----------------------------
5834 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
5835 L
: List_Id
:= List_Containing
(N
);
5836 P
: constant Node_Id
:= Parent
(L
);
5839 if not Is_List_Member
(F_Node
) then
5840 if Nkind
(P
) = N_Package_Specification
5841 and then L
= Visible_Declarations
(P
)
5842 and then Present
(Private_Declarations
(P
))
5843 and then not Is_Empty_List
(Private_Declarations
(P
))
5845 L
:= Private_Declarations
(P
);
5848 Insert_After
(Last
(L
), F_Node
);
5850 end Insert_After_Last_Decl
;
5856 procedure Install_Body
5857 (Act_Body
: Node_Id
;
5862 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
5863 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
5864 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
5865 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
5866 Gen_Unit
: constant Node_Id
:=
5867 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
5868 Orig_Body
: Node_Id
:= Gen_Body
;
5870 Body_Unit
: Node_Id
;
5872 Must_Delay
: Boolean;
5874 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
5875 -- Find subprogram (if any) that encloses instance and/or generic body.
5877 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
5878 -- If the instance is nested inside a generic unit, the Sloc of the
5879 -- instance indicates the place of the original definition, not the
5880 -- point of the current enclosing instance. Pending a better usage of
5881 -- Slocs to indicate instantiation places, we determine the place of
5882 -- origin of a node by finding the maximum sloc of any ancestor node.
5883 -- Why is this not equivalent fo Top_Level_Location ???
5885 --------------------
5886 -- Enclosing_Subp --
5887 --------------------
5889 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
5890 Scop
: Entity_Id
:= Scope
(Id
);
5893 while Scop
/= Standard_Standard
5894 and then not Is_Overloadable
(Scop
)
5896 Scop
:= Scope
(Scop
);
5906 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
5913 while Present
(N1
) and then N1
/= Act_Unit
loop
5914 if Sloc
(N1
) > Res
then
5924 -- Start of processing for Install_Body
5927 -- If the body is a subunit, the freeze point is the corresponding
5928 -- stub in the current compilation, not the subunit itself.
5930 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
5931 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
5933 Orig_Body
:= Gen_Body
;
5936 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
5938 -- If the instantiation and the generic definition appear in the
5939 -- same package declaration, this is an early instantiation.
5940 -- If they appear in the same declarative part, it is an early
5941 -- instantiation only if the generic body appears textually later,
5942 -- and the generic body is also in the main unit.
5944 -- If instance is nested within a subprogram, and the generic body is
5945 -- not, the instance is delayed because the enclosing body is. If
5946 -- instance and body are within the same scope, or the same sub-
5947 -- program body, indicate explicitly that the instance is delayed.
5950 (Gen_Unit
= Act_Unit
5951 and then ((Nkind
(Gen_Unit
) = N_Package_Declaration
)
5952 or else Nkind
(Gen_Unit
) = N_Generic_Package_Declaration
5953 or else (Gen_Unit
= Body_Unit
5954 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
5955 and then Is_In_Main_Unit
(Gen_Unit
)
5956 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
5958 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
5960 -- If this is an early instantiation, the freeze node is placed after
5961 -- the generic body. Otherwise, if the generic appears in an instance,
5962 -- we cannot freeze the current instance until the outer one is frozen.
5963 -- This is only relevant if the current instance is nested within some
5964 -- inner scope not itself within the outer instance. If this scope is
5965 -- a package body in the same declarative part as the outer instance,
5966 -- then that body needs to be frozen after the outer instance. Finally,
5967 -- if no delay is needed, we place the freeze node at the end of the
5968 -- current declarative part.
5970 if Expander_Active
then
5971 Ensure_Freeze_Node
(Act_Id
);
5972 F_Node
:= Freeze_Node
(Act_Id
);
5975 Insert_After
(Orig_Body
, F_Node
);
5977 elsif Is_Generic_Instance
(Par
)
5978 and then Present
(Freeze_Node
(Par
))
5979 and then Scope
(Act_Id
) /= Par
5981 -- Freeze instance of inner generic after instance of enclosing
5984 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
5985 Insert_After
(Freeze_Node
(Par
), F_Node
);
5987 -- Freeze package enclosing instance of inner generic after
5988 -- instance of enclosing generic.
5990 elsif Nkind
(Parent
(N
)) = N_Package_Body
5991 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
5995 Enclosing
: constant Entity_Id
:=
5996 Corresponding_Spec
(Parent
(N
));
5999 Insert_After_Last_Decl
(N
, F_Node
);
6000 Ensure_Freeze_Node
(Enclosing
);
6002 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
6003 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
6008 Insert_After_Last_Decl
(N
, F_Node
);
6012 Insert_After_Last_Decl
(N
, F_Node
);
6016 Set_Is_Frozen
(Act_Id
);
6017 Insert_Before
(N
, Act_Body
);
6018 Mark_Rewrite_Insertion
(Act_Body
);
6021 --------------------
6022 -- Install_Parent --
6023 --------------------
6025 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
6026 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
6027 S
: constant Entity_Id
:= Current_Scope
;
6028 Inst_Par
: Entity_Id
;
6029 First_Par
: Entity_Id
;
6030 Inst_Node
: Node_Id
;
6031 Gen_Par
: Entity_Id
;
6032 First_Gen
: Entity_Id
;
6035 procedure Install_Formal_Packages
(Par
: Entity_Id
);
6036 -- If any of the formals of the parent are formal packages with box,
6037 -- their formal parts are visible in the parent and thus in the child
6038 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6039 -- for the unit itself.
6041 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
6042 -- Install the scopes of noninstance parent units ending with Par.
6044 procedure Install_Spec
(Par
: Entity_Id
);
6045 -- The child unit is within the declarative part of the parent, so
6046 -- the declarations within the parent are immediately visible.
6048 -----------------------------
6049 -- Install_Formal_Packages --
6050 -----------------------------
6052 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
6056 E
:= First_Entity
(Par
);
6058 while Present
(E
) loop
6060 if Ekind
(E
) = E_Package
6061 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6063 -- If this is the renaming for the parent instance, done.
6065 if Renamed_Object
(E
) = Par
then
6068 -- The visibility of a formal of an enclosing generic is
6071 elsif Denotes_Formal_Package
(E
) then
6074 elsif Present
(Associated_Formal_Package
(E
))
6075 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
6077 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6078 Set_Is_Hidden
(E
, False);
6084 end Install_Formal_Packages
;
6086 -------------------------------
6087 -- Install_Noninstance_Specs --
6088 -------------------------------
6090 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
6093 and then Par
/= Standard_Standard
6094 and then not In_Open_Scopes
(Par
)
6096 Install_Noninstance_Specs
(Scope
(Par
));
6099 end Install_Noninstance_Specs
;
6105 procedure Install_Spec
(Par
: Entity_Id
) is
6106 Spec
: constant Node_Id
:=
6107 Specification
(Unit_Declaration_Node
(Par
));
6111 Set_Is_Immediately_Visible
(Par
);
6112 Install_Visible_Declarations
(Par
);
6113 Install_Private_Declarations
(Par
);
6114 Set_Use
(Visible_Declarations
(Spec
));
6115 Set_Use
(Private_Declarations
(Spec
));
6118 -- Start of processing for Install_Parent
6121 -- We need to install the parent instance to compile the instantiation
6122 -- of the child, but the child instance must appear in the current
6123 -- scope. Given that we cannot place the parent above the current
6124 -- scope in the scope stack, we duplicate the current scope and unstack
6125 -- both after the instantiation is complete.
6127 -- If the parent is itself the instantiation of a child unit, we must
6128 -- also stack the instantiation of its parent, and so on. Each such
6129 -- ancestor is the prefix of the name in a prior instantiation.
6131 -- If this is a nested instance, the parent unit itself resolves to
6132 -- a renaming of the parent instance, whose declaration we need.
6134 -- Finally, the parent may be a generic (not an instance) when the
6135 -- child unit appears as a formal package.
6139 if Present
(Renamed_Entity
(Inst_Par
)) then
6140 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6143 First_Par
:= Inst_Par
;
6146 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
6148 First_Gen
:= Gen_Par
;
6150 while Present
(Gen_Par
)
6151 and then Is_Child_Unit
(Gen_Par
)
6153 -- Load grandparent instance as well
6155 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
6157 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
6158 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
6160 if Present
(Renamed_Entity
(Inst_Par
)) then
6161 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6166 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
6168 if Present
(Gen_Par
) then
6169 Prepend_Elmt
(Inst_Par
, Ancestors
);
6172 -- Parent is not the name of an instantiation
6174 Install_Noninstance_Specs
(Inst_Par
);
6186 if Present
(First_Gen
) then
6187 Append_Elmt
(First_Par
, Ancestors
);
6190 Install_Noninstance_Specs
(First_Par
);
6193 if not Is_Empty_Elmt_List
(Ancestors
) then
6194 Elmt
:= First_Elmt
(Ancestors
);
6196 while Present
(Elmt
) loop
6197 Install_Spec
(Node
(Elmt
));
6198 Install_Formal_Packages
(Node
(Elmt
));
6209 --------------------------------
6210 -- Instantiate_Formal_Package --
6211 --------------------------------
6213 function Instantiate_Formal_Package
6216 Analyzed_Formal
: Node_Id
) return List_Id
6218 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6219 Actual_Pack
: Entity_Id
;
6220 Formal_Pack
: Entity_Id
;
6221 Gen_Parent
: Entity_Id
;
6224 Parent_Spec
: Node_Id
;
6226 procedure Find_Matching_Actual
6228 Act
: in out Entity_Id
);
6229 -- We need to associate each formal entity in the formal package
6230 -- with the corresponding entity in the actual package. The actual
6231 -- package has been analyzed and possibly expanded, and as a result
6232 -- there is no one-to-one correspondence between the two lists (for
6233 -- example, the actual may include subtypes, itypes, and inherited
6234 -- primitive operations, interspersed among the renaming declarations
6235 -- for the actuals) . We retrieve the corresponding actual by name
6236 -- because each actual has the same name as the formal, and they do
6237 -- appear in the same order.
6239 function Formal_Entity
6241 Act_Ent
: Entity_Id
) return Entity_Id
;
6242 -- Returns the entity associated with the given formal F. In the
6243 -- case where F is a formal package, this function will iterate
6244 -- through all of F's formals and enter map associations from the
6245 -- actuals occurring in the formal package's corresponding actual
6246 -- package (obtained via Act_Ent) to the formal package's formal
6247 -- parameters. This function is called recursively for arbitrary
6248 -- levels of formal packages.
6250 function Is_Instance_Of
6251 (Act_Spec
: Entity_Id
;
6252 Gen_Anc
: Entity_Id
) return Boolean;
6253 -- The actual can be an instantiation of a generic within another
6254 -- instance, in which case there is no direct link from it to the
6255 -- original generic ancestor. In that case, we recognize that the
6256 -- ultimate ancestor is the same by examining names and scopes.
6258 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
6259 -- Within the generic part, entities in the formal package are
6260 -- visible. To validate subsequent type declarations, indicate
6261 -- the correspondence betwen the entities in the analyzed formal,
6262 -- and the entities in the actual package. There are three packages
6263 -- involved in the instantiation of a formal package: the parent
6264 -- generic P1 which appears in the generic declaration, the fake
6265 -- instantiation P2 which appears in the analyzed generic, and whose
6266 -- visible entities may be used in subsequent formals, and the actual
6267 -- P3 in the instance. To validate subsequent formals, me indicate
6268 -- that the entities in P2 are mapped into those of P3. The mapping of
6269 -- entities has to be done recursively for nested packages.
6271 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
6272 -- If the current formal is declared with a box, its own formals are
6273 -- visible in the instance, as they were in the generic, and their
6274 -- Hidden flag must be reset. If some of these formals are themselves
6275 -- packages declared with a box, the processing must be recursive.
6277 --------------------------
6278 -- Find_Matching_Actual --
6279 --------------------------
6281 procedure Find_Matching_Actual
6283 Act
: in out Entity_Id
)
6285 Formal_Ent
: Entity_Id
;
6288 case Nkind
(Original_Node
(F
)) is
6289 when N_Formal_Object_Declaration |
6290 N_Formal_Type_Declaration
=>
6291 Formal_Ent
:= Defining_Identifier
(F
);
6293 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6297 when N_Formal_Subprogram_Declaration |
6298 N_Formal_Package_Declaration |
6299 N_Package_Declaration |
6300 N_Generic_Package_Declaration
=>
6301 Formal_Ent
:= Defining_Entity
(F
);
6303 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6308 raise Program_Error
;
6310 end Find_Matching_Actual
;
6316 function Formal_Entity
6318 Act_Ent
: Entity_Id
) return Entity_Id
6320 Orig_Node
: Node_Id
:= F
;
6321 Act_Pkg
: Entity_Id
;
6324 case Nkind
(Original_Node
(F
)) is
6325 when N_Formal_Object_Declaration
=>
6326 return Defining_Identifier
(F
);
6328 when N_Formal_Type_Declaration
=>
6329 return Defining_Identifier
(F
);
6331 when N_Formal_Subprogram_Declaration
=>
6332 return Defining_Unit_Name
(Specification
(F
));
6334 when N_Package_Declaration
=>
6335 return Defining_Unit_Name
(Specification
(F
));
6337 when N_Formal_Package_Declaration |
6338 N_Generic_Package_Declaration
=>
6340 if Nkind
(F
) = N_Generic_Package_Declaration
then
6341 Orig_Node
:= Original_Node
(F
);
6346 -- Find matching actual package, skipping over itypes and
6347 -- other entities generated when analyzing the formal. We
6348 -- know that if the instantiation is legal then there is
6349 -- a matching package for the formal.
6351 while Ekind
(Act_Pkg
) /= E_Package
loop
6352 Act_Pkg
:= Next_Entity
(Act_Pkg
);
6356 Actual_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
6357 Formal_Node
: Node_Id
;
6358 Formal_Ent
: Entity_Id
;
6360 Gen_Decl
: constant Node_Id
:=
6361 Unit_Declaration_Node
6362 (Entity
(Name
(Orig_Node
)));
6364 Formals
: constant List_Id
:=
6365 Generic_Formal_Declarations
(Gen_Decl
);
6368 if Present
(Formals
) then
6369 Formal_Node
:= First_Non_Pragma
(Formals
);
6371 Formal_Node
:= Empty
;
6374 while Present
(Actual_Ent
)
6375 and then Present
(Formal_Node
)
6376 and then Actual_Ent
/= First_Private_Entity
(Act_Ent
)
6378 -- ??? Are the following calls also needed here:
6380 -- Set_Is_Hidden (Actual_Ent, False);
6381 -- Set_Is_Potentially_Use_Visible
6382 -- (Actual_Ent, In_Use (Act_Ent));
6384 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6385 if Present
(Formal_Ent
) then
6386 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6388 Next_Non_Pragma
(Formal_Node
);
6390 Next_Entity
(Actual_Ent
);
6394 return Defining_Identifier
(Orig_Node
);
6396 when N_Use_Package_Clause
=>
6399 when N_Use_Type_Clause
=>
6402 -- We return Empty for all other encountered forms of
6403 -- declarations because there are some cases of nonformal
6404 -- sorts of declaration that can show up (e.g., when array
6405 -- formals are present). Since it's not clear what kinds
6406 -- can appear among the formals, we won't raise failure here.
6414 --------------------
6415 -- Is_Instance_Of --
6416 --------------------
6418 function Is_Instance_Of
6419 (Act_Spec
: Entity_Id
;
6420 Gen_Anc
: Entity_Id
) return Boolean
6422 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
6425 if No
(Gen_Par
) then
6428 -- Simplest case: the generic parent of the actual is the formal.
6430 elsif Gen_Par
= Gen_Anc
then
6433 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
6436 -- The actual may be obtained through several instantiations. Its
6437 -- scope must itself be an instance of a generic declared in the
6438 -- same scope as the formal. Any other case is detected above.
6440 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
6444 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
6452 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
6457 Set_Instance_Of
(Form
, Act
);
6459 -- Traverse formal and actual package to map the corresponding
6460 -- entities. We skip over internal entities that may be generated
6461 -- during semantic analysis, and find the matching entities by
6462 -- name, given that they must appear in the same order.
6464 E1
:= First_Entity
(Form
);
6465 E2
:= First_Entity
(Act
);
6467 and then E1
/= First_Private_Entity
(Form
)
6469 if not Is_Internal
(E1
)
6470 and then not Is_Class_Wide_Type
(E1
)
6471 and then Present
(Parent
(E1
))
6474 and then Chars
(E2
) /= Chars
(E1
)
6482 Set_Instance_Of
(E1
, E2
);
6485 and then Is_Tagged_Type
(E2
)
6488 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
6491 if Ekind
(E1
) = E_Package
6492 and then No
(Renamed_Object
(E1
))
6494 Map_Entities
(E1
, E2
);
6503 ---------------------------
6504 -- Process_Nested_Formal --
6505 ---------------------------
6507 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
6511 if Present
(Associated_Formal_Package
(Formal
))
6512 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
6514 Ent
:= First_Entity
(Formal
);
6515 while Present
(Ent
) loop
6516 Set_Is_Hidden
(Ent
, False);
6517 Set_Is_Potentially_Use_Visible
6518 (Ent
, Is_Potentially_Use_Visible
(Formal
));
6520 if Ekind
(Ent
) = E_Package
then
6521 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
6522 Process_Nested_Formal
(Ent
);
6528 end Process_Nested_Formal
;
6530 -- Start of processing for Instantiate_Formal_Package
6535 if not Is_Entity_Name
(Actual
)
6536 or else Ekind
(Entity
(Actual
)) /= E_Package
6539 ("expect package instance to instantiate formal", Actual
);
6540 Abandon_Instantiation
(Actual
);
6541 raise Program_Error
;
6544 Actual_Pack
:= Entity
(Actual
);
6545 Set_Is_Instantiated
(Actual_Pack
);
6547 -- The actual may be a renamed package, or an outer generic
6548 -- formal package whose instantiation is converted into a renaming.
6550 if Present
(Renamed_Object
(Actual_Pack
)) then
6551 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
6554 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
6555 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
6556 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
6559 Generic_Parent
(Specification
(Analyzed_Formal
));
6561 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6564 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
6565 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
6567 Parent_Spec
:= Parent
(Actual_Pack
);
6570 if Gen_Parent
= Any_Id
then
6572 ("previous error in declaration of formal package", Actual
);
6573 Abandon_Instantiation
(Actual
);
6576 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
6582 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
6583 Abandon_Instantiation
(Actual
);
6586 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
6587 Map_Entities
(Formal_Pack
, Actual_Pack
);
6590 Make_Package_Renaming_Declaration
(Loc
,
6591 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
6592 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
6594 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
6595 Defining_Identifier
(Formal
));
6596 Decls
:= New_List
(Nod
);
6598 -- If the formal F has a box, then the generic declarations are
6599 -- visible in the generic G. In an instance of G, the corresponding
6600 -- entities in the actual for F (which are the actuals for the
6601 -- instantiation of the generic that F denotes) must also be made
6602 -- visible for analysis of the current instance. On exit from the
6603 -- current instance, those entities are made private again. If the
6604 -- actual is currently in use, these entities are also use-visible.
6606 -- The loop through the actual entities also steps through the
6607 -- formal entities and enters associations from formals to
6608 -- actuals into the renaming map. This is necessary to properly
6609 -- handle checking of actual parameter associations for later
6610 -- formals that depend on actuals declared in the formal package.
6612 if Box_Present
(Formal
) then
6614 Gen_Decl
: constant Node_Id
:=
6615 Unit_Declaration_Node
(Gen_Parent
);
6616 Formals
: constant List_Id
:=
6617 Generic_Formal_Declarations
(Gen_Decl
);
6618 Actual_Ent
: Entity_Id
;
6619 Formal_Node
: Node_Id
;
6620 Formal_Ent
: Entity_Id
;
6623 if Present
(Formals
) then
6624 Formal_Node
:= First_Non_Pragma
(Formals
);
6626 Formal_Node
:= Empty
;
6629 Actual_Ent
:= First_Entity
(Actual_Pack
);
6631 while Present
(Actual_Ent
)
6632 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
6634 Set_Is_Hidden
(Actual_Ent
, False);
6635 Set_Is_Potentially_Use_Visible
6636 (Actual_Ent
, In_Use
(Actual_Pack
));
6638 if Ekind
(Actual_Ent
) = E_Package
then
6639 Process_Nested_Formal
(Actual_Ent
);
6642 if Present
(Formal_Node
) then
6643 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6645 if Present
(Formal_Ent
) then
6646 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
6647 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6650 Next_Non_Pragma
(Formal_Node
);
6653 -- No further formals to match, but the generic
6654 -- part may contain inherited operation that are
6655 -- not hidden in the enclosing instance.
6657 Next_Entity
(Actual_Ent
);
6663 -- If the formal is not declared with a box, reanalyze it as
6664 -- an instantiation, to verify the matching rules of 12.7. The
6665 -- actual checks are performed after the generic associations
6670 I_Pack
: constant Entity_Id
:=
6671 Make_Defining_Identifier
(Sloc
(Actual
),
6672 Chars
=> New_Internal_Name
('P'));
6675 Set_Is_Internal
(I_Pack
);
6678 Make_Package_Instantiation
(Sloc
(Actual
),
6679 Defining_Unit_Name
=> I_Pack
,
6680 Name
=> New_Occurrence_Of
(Gen_Parent
, Sloc
(Actual
)),
6681 Generic_Associations
=>
6682 Generic_Associations
(Formal
)));
6688 end Instantiate_Formal_Package
;
6690 -----------------------------------
6691 -- Instantiate_Formal_Subprogram --
6692 -----------------------------------
6694 function Instantiate_Formal_Subprogram
6697 Analyzed_Formal
: Node_Id
) return Node_Id
6699 Loc
: Source_Ptr
:= Sloc
(Instantiation_Node
);
6700 Formal_Sub
: constant Entity_Id
:=
6701 Defining_Unit_Name
(Specification
(Formal
));
6702 Analyzed_S
: constant Entity_Id
:=
6703 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6704 Decl_Node
: Node_Id
;
6708 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
6709 -- If the generic is a child unit, the parent has been installed
6710 -- on the scope stack, but a default subprogram cannot resolve to
6711 -- something on the parent because that parent is not really part
6712 -- of the visible context (it is there to resolve explicit local
6713 -- entities). If the default has resolved in this way, we remove
6714 -- the entity from immediate visibility and analyze the node again
6715 -- to emit an error message or find another visible candidate.
6717 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
6718 -- Perform legality check and raise exception on failure.
6720 -----------------------
6721 -- From_Parent_Scope --
6722 -----------------------
6724 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
6725 Gen_Scope
: Node_Id
:= Scope
(Analyzed_S
);
6728 while Present
(Gen_Scope
)
6729 and then Is_Child_Unit
(Gen_Scope
)
6731 if Scope
(Subp
) = Scope
(Gen_Scope
) then
6735 Gen_Scope
:= Scope
(Gen_Scope
);
6739 end From_Parent_Scope
;
6741 -----------------------------
6742 -- Valid_Actual_Subprogram --
6743 -----------------------------
6745 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
6746 Act_E
: Entity_Id
:= Empty
;
6749 if Is_Entity_Name
(Act
) then
6750 Act_E
:= Entity
(Act
);
6751 elsif Nkind
(Act
) = N_Selected_Component
6752 and then Is_Entity_Name
(Selector_Name
(Act
))
6754 Act_E
:= Entity
(Selector_Name
(Act
));
6757 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
6758 or else Nkind
(Act
) = N_Attribute_Reference
6759 or else Nkind
(Act
) = N_Indexed_Component
6760 or else Nkind
(Act
) = N_Character_Literal
6761 or else Nkind
(Act
) = N_Explicit_Dereference
6767 ("expect subprogram or entry name in instantiation of&",
6768 Instantiation_Node
, Formal_Sub
);
6769 Abandon_Instantiation
(Instantiation_Node
);
6771 end Valid_Actual_Subprogram
;
6773 -- Start of processing for Instantiate_Formal_Subprogram
6776 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
6778 -- Create new entity for the actual (New_Copy_Tree does not).
6780 Set_Defining_Unit_Name
6781 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6783 -- Find entity of actual. If the actual is an attribute reference, it
6784 -- cannot be resolved here (its formal is missing) but is handled
6785 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6786 -- fully resolved subsequently, when the renaming declaration for the
6787 -- formal is analyzed. If it is an explicit dereference, resolve the
6788 -- prefix but not the actual itself, to prevent interpretation as a
6791 if Present
(Actual
) then
6792 Loc
:= Sloc
(Actual
);
6793 Set_Sloc
(New_Spec
, Loc
);
6795 if Nkind
(Actual
) = N_Operator_Symbol
then
6796 Find_Direct_Name
(Actual
);
6798 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
6799 Analyze
(Prefix
(Actual
));
6801 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
6805 Valid_Actual_Subprogram
(Actual
);
6808 elsif Present
(Default_Name
(Formal
)) then
6809 if Nkind
(Default_Name
(Formal
)) /= N_Attribute_Reference
6810 and then Nkind
(Default_Name
(Formal
)) /= N_Selected_Component
6811 and then Nkind
(Default_Name
(Formal
)) /= N_Indexed_Component
6812 and then Nkind
(Default_Name
(Formal
)) /= N_Character_Literal
6813 and then Present
(Entity
(Default_Name
(Formal
)))
6815 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
6817 Nam
:= New_Copy
(Default_Name
(Formal
));
6818 Set_Sloc
(Nam
, Loc
);
6821 elsif Box_Present
(Formal
) then
6823 -- Actual is resolved at the point of instantiation. Create
6824 -- an identifier or operator with the same name as the formal.
6826 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
6827 Nam
:= Make_Operator_Symbol
(Loc
,
6828 Chars
=> Chars
(Formal_Sub
),
6829 Strval
=> No_String
);
6831 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
6835 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
6837 ("missing actual&", Instantiation_Node
, Formal_Sub
);
6839 ("\in instantiation of & declared#",
6840 Instantiation_Node
, Scope
(Analyzed_S
));
6841 Abandon_Instantiation
(Instantiation_Node
);
6845 Make_Subprogram_Renaming_Declaration
(Loc
,
6846 Specification
=> New_Spec
,
6849 -- If we do not have an actual and the formal specified <> then
6850 -- set to get proper default.
6852 if No
(Actual
) and then Box_Present
(Formal
) then
6853 Set_From_Default
(Decl_Node
);
6856 -- Gather possible interpretations for the actual before analyzing the
6857 -- instance. If overloaded, it will be resolved when analyzing the
6858 -- renaming declaration.
6860 if Box_Present
(Formal
)
6861 and then No
(Actual
)
6865 if Is_Child_Unit
(Scope
(Analyzed_S
))
6866 and then Present
(Entity
(Nam
))
6868 if not Is_Overloaded
(Nam
) then
6870 if From_Parent_Scope
(Entity
(Nam
)) then
6871 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
6872 Set_Entity
(Nam
, Empty
);
6873 Set_Etype
(Nam
, Empty
);
6877 Set_Is_Immediately_Visible
(Entity
(Nam
));
6886 Get_First_Interp
(Nam
, I
, It
);
6888 while Present
(It
.Nam
) loop
6889 if From_Parent_Scope
(It
.Nam
) then
6893 Get_Next_Interp
(I
, It
);
6900 -- The generic instantiation freezes the actual. This can only be
6901 -- done once the actual is resolved, in the analysis of the renaming
6902 -- declaration. To indicate that must be done, we set the corresponding
6903 -- spec of the node to point to the formal subprogram entity.
6905 Set_Corresponding_Spec
(Decl_Node
, Analyzed_S
);
6907 -- We cannot analyze the renaming declaration, and thus find the
6908 -- actual, until the all the actuals are assembled in the instance.
6909 -- For subsequent checks of other actuals, indicate the node that
6910 -- will hold the instance of this formal.
6912 Set_Instance_Of
(Analyzed_S
, Nam
);
6914 if Nkind
(Actual
) = N_Selected_Component
6915 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
6916 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
6918 -- The renaming declaration will create a body, which must appear
6919 -- outside of the instantiation, We move the renaming declaration
6920 -- out of the instance, and create an additional renaming inside,
6921 -- to prevent freezing anomalies.
6924 Anon_Id
: constant Entity_Id
:=
6925 Make_Defining_Identifier
6926 (Loc
, New_Internal_Name
('E'));
6928 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
6929 Insert_Before
(Instantiation_Node
, Decl_Node
);
6930 Analyze
(Decl_Node
);
6932 -- Now create renaming within the instance
6935 Make_Subprogram_Renaming_Declaration
(Loc
,
6936 Specification
=> New_Copy_Tree
(New_Spec
),
6937 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
6939 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
6940 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6945 end Instantiate_Formal_Subprogram
;
6947 ------------------------
6948 -- Instantiate_Object --
6949 ------------------------
6951 function Instantiate_Object
6954 Analyzed_Formal
: Node_Id
) return List_Id
6956 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
6957 Type_Id
: constant Node_Id
:= Subtype_Mark
(Formal
);
6958 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6959 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
6960 Orig_Ftyp
: constant Entity_Id
:=
6961 Etype
(Defining_Identifier
(Analyzed_Formal
));
6962 List
: constant List_Id
:= New_List
;
6964 Decl_Node
: Node_Id
;
6965 Subt_Decl
: Node_Id
:= Empty
;
6968 -- Sloc for error message on missing actual.
6969 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
6971 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
6972 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
6975 Set_Parent
(List
, Parent
(Actual
));
6979 if Out_Present
(Formal
) then
6981 -- An IN OUT generic actual must be a name. The instantiation is
6982 -- a renaming declaration. The actual is the name being renamed.
6983 -- We use the actual directly, rather than a copy, because it is not
6984 -- used further in the list of actuals, and because a copy or a use
6985 -- of relocate_node is incorrect if the instance is nested within
6986 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6987 -- field links the declaration to the generic association.
6992 Instantiation_Node
, Formal_Id
);
6994 ("\in instantiation of & declared#",
6996 Scope
(Defining_Identifier
(Analyzed_Formal
)));
6997 Abandon_Instantiation
(Instantiation_Node
);
7001 Make_Object_Renaming_Declaration
(Loc
,
7002 Defining_Identifier
=> New_Copy
(Formal_Id
),
7003 Subtype_Mark
=> New_Copy_Tree
(Type_Id
),
7006 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7008 -- The analysis of the actual may produce insert_action nodes, so
7009 -- the declaration must have a context in which to attach them.
7011 Append
(Decl_Node
, List
);
7014 -- This check is performed here because Analyze_Object_Renaming
7015 -- will not check it when Comes_From_Source is False. Note
7016 -- though that the check for the actual being the name of an
7017 -- object will be performed in Analyze_Object_Renaming.
7019 if Is_Object_Reference
(Actual
)
7020 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
7023 ("illegal discriminant-dependent component for in out parameter",
7027 -- The actual has to be resolved in order to check that it is
7028 -- a variable (due to cases such as F(1), where F returns
7029 -- access to an array, and for overloaded prefixes).
7032 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
7034 if Is_Private_Type
(Ftyp
)
7035 and then not Is_Private_Type
(Etype
(Actual
))
7036 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
7037 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
7039 -- If the actual has the type of the full view of the formal,
7040 -- or else a non-private subtype of the formal, then
7041 -- the visibility of the formal type has changed. Add to the
7042 -- actuals a subtype declaration that will force the exchange
7043 -- of views in the body of the instance as well.
7046 Make_Subtype_Declaration
(Loc
,
7047 Defining_Identifier
=>
7048 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
7049 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
7051 Prepend
(Subt_Decl
, List
);
7053 Append_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
7054 Exchange_Declarations
(Ftyp
);
7057 Resolve
(Actual
, Ftyp
);
7059 if not Is_Variable
(Actual
) or else Paren_Count
(Actual
) > 0 then
7061 ("actual for& must be a variable", Actual
, Formal_Id
);
7063 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
7065 "type of actual does not match type of&", Actual
, Formal_Id
);
7069 Note_Possible_Modification
(Actual
);
7071 -- Check for instantiation of atomic/volatile actual for
7072 -- non-atomic/volatile formal (RM C.6 (12)).
7074 if Is_Atomic_Object
(Actual
)
7075 and then not Is_Atomic
(Orig_Ftyp
)
7078 ("cannot instantiate non-atomic formal object " &
7079 "with atomic actual", Actual
);
7081 elsif Is_Volatile_Object
(Actual
)
7082 and then not Is_Volatile
(Orig_Ftyp
)
7085 ("cannot instantiate non-volatile formal object " &
7086 "with volatile actual", Actual
);
7092 -- The instantiation of a generic formal in-parameter
7093 -- is a constant declaration. The actual is the expression for
7094 -- that declaration.
7096 if Present
(Actual
) then
7098 Decl_Node
:= Make_Object_Declaration
(Loc
,
7099 Defining_Identifier
=> New_Copy
(Formal_Id
),
7100 Constant_Present
=> True,
7101 Object_Definition
=> New_Copy_Tree
(Type_Id
),
7102 Expression
=> Actual
);
7104 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7106 -- A generic formal object of a tagged type is defined
7107 -- to be aliased so the new constant must also be treated
7111 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7113 Set_Aliased_Present
(Decl_Node
);
7116 Append
(Decl_Node
, List
);
7118 -- No need to repeat (pre-)analysis of some expression nodes
7119 -- already handled in Pre_Analyze_Actuals.
7121 if Nkind
(Actual
) /= N_Allocator
then
7126 Typ
: constant Entity_Id
:=
7128 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
7131 Freeze_Before
(Instantiation_Node
, Typ
);
7133 -- If the actual is an aggregate, perform name resolution
7134 -- on its components (the analysis of an aggregate does not
7135 -- do it) to capture local names that may be hidden if the
7136 -- generic is a child unit.
7138 if Nkind
(Actual
) = N_Aggregate
then
7139 Pre_Analyze_And_Resolve
(Actual
, Typ
);
7143 elsif Present
(Expression
(Formal
)) then
7145 -- Use default to construct declaration.
7148 Make_Object_Declaration
(Sloc
(Formal
),
7149 Defining_Identifier
=> New_Copy
(Formal_Id
),
7150 Constant_Present
=> True,
7151 Object_Definition
=> New_Copy
(Type_Id
),
7152 Expression
=> New_Copy_Tree
(Expression
(Formal
)));
7154 Append
(Decl_Node
, List
);
7155 Set_Analyzed
(Expression
(Decl_Node
), False);
7160 Instantiation_Node
, Formal_Id
);
7161 Error_Msg_NE
("\in instantiation of & declared#",
7163 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7166 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7168 -- Create dummy constant declaration so that instance can
7169 -- be analyzed, to minimize cascaded visibility errors.
7172 Make_Object_Declaration
(Loc
,
7173 Defining_Identifier
=> New_Copy
(Formal_Id
),
7174 Constant_Present
=> True,
7175 Object_Definition
=> New_Copy
(Type_Id
),
7177 Make_Attribute_Reference
(Sloc
(Formal_Id
),
7178 Attribute_Name
=> Name_First
,
7179 Prefix
=> New_Copy
(Type_Id
)));
7181 Append
(Decl_Node
, List
);
7184 Abandon_Instantiation
(Instantiation_Node
);
7191 end Instantiate_Object
;
7193 ------------------------------
7194 -- Instantiate_Package_Body --
7195 ------------------------------
7197 procedure Instantiate_Package_Body
7198 (Body_Info
: Pending_Body_Info
;
7199 Inlined_Body
: Boolean := False)
7201 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7202 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7203 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7205 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7206 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7207 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7208 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
7209 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
7211 Act_Body_Name
: Node_Id
;
7213 Gen_Body_Id
: Node_Id
;
7215 Act_Body_Id
: Entity_Id
;
7217 Parent_Installed
: Boolean := False;
7218 Save_Style_Check
: constant Boolean := Style_Check
;
7221 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7223 -- The instance body may already have been processed, as the parent
7224 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7226 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
7230 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7232 if No
(Gen_Body_Id
) then
7233 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7234 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7237 -- Establish global variable for sloc adjustment and for error
7240 Instantiation_Node
:= Inst_Node
;
7242 if Present
(Gen_Body_Id
) then
7243 Save_Env
(Gen_Unit
, Act_Decl_Id
);
7244 Style_Check
:= False;
7245 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7247 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7249 Create_Instantiation_Source
7250 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
7254 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7256 -- Build new name (possibly qualified) for body declaration
7258 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
7260 -- Some attributes of the spec entity are not inherited by the
7263 Set_Handler_Records
(Act_Body_Id
, No_List
);
7265 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7266 N_Defining_Program_Unit_Name
7269 Make_Defining_Program_Unit_Name
(Loc
,
7270 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
7271 Defining_Identifier
=> Act_Body_Id
);
7273 Act_Body_Name
:= Act_Body_Id
;
7276 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
7278 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
7279 Check_Generic_Actuals
(Act_Decl_Id
, False);
7281 -- If it is a child unit, make the parent instance (which is an
7282 -- instance of the parent of the generic) visible. The parent
7283 -- instance is the prefix of the name of the generic unit.
7285 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7286 and then Nkind
(Gen_Id
) = N_Expanded_Name
7288 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7289 Parent_Installed
:= True;
7291 elsif Is_Child_Unit
(Gen_Unit
) then
7292 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7293 Parent_Installed
:= True;
7296 -- If the instantiation is a library unit, and this is the main
7297 -- unit, then build the resulting compilation unit nodes for the
7298 -- instance. If this is a compilation unit but it is not the main
7299 -- unit, then it is the body of a unit in the context, that is being
7300 -- compiled because it is encloses some inlined unit or another
7301 -- generic unit being instantiated. In that case, this body is not
7302 -- part of the current compilation, and is not attached to the tree,
7303 -- but its parent must be set for analysis.
7305 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7307 -- Replace instance node with body of instance, and create
7308 -- new node for corresponding instance declaration.
7310 Build_Instance_Compilation_Unit_Nodes
7311 (Inst_Node
, Act_Body
, Act_Decl
);
7312 Analyze
(Inst_Node
);
7314 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7316 -- If the instance is a child unit itself, then set the
7317 -- scope of the expanded body to be the parent of the
7318 -- instantiation (ensuring that the fully qualified name
7319 -- will be generated for the elaboration subprogram).
7321 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7322 N_Defining_Program_Unit_Name
7325 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
7329 -- Case where instantiation is not a library unit
7332 -- If this is an early instantiation, i.e. appears textually
7333 -- before the corresponding body and must be elaborated first,
7334 -- indicate that the body instance is to be delayed.
7336 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
7338 -- Now analyze the body. We turn off all checks if this is
7339 -- an internal unit, since there is no reason to have checks
7340 -- on for any predefined run-time library code. All such
7341 -- code is designed to be compiled with checks off.
7343 -- Note that we do NOT apply this criterion to children of
7344 -- GNAT (or on VMS, children of DEC). The latter units must
7345 -- suppress checks explicitly if this is needed.
7347 if Is_Predefined_File_Name
7348 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
7350 Analyze
(Act_Body
, Suppress
=> All_Checks
);
7356 if not Generic_Separately_Compiled
(Gen_Unit
) then
7357 Inherit_Context
(Gen_Body
, Inst_Node
);
7360 -- Remove the parent instances if they have been placed on the
7361 -- scope stack to compile the body.
7363 if Parent_Installed
then
7364 Remove_Parent
(In_Body
=> True);
7367 Restore_Private_Views
(Act_Decl_Id
);
7369 -- Remove the current unit from visibility if this is an instance
7370 -- that is not elaborated on the fly for inlining purposes.
7372 if not Inlined_Body
then
7373 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
7377 Style_Check
:= Save_Style_Check
;
7379 -- If we have no body, and the unit requires a body, then complain.
7380 -- This complaint is suppressed if we have detected other errors
7381 -- (since a common reason for missing the body is that it had errors).
7383 elsif Unit_Requires_Body
(Gen_Unit
) then
7384 if Serious_Errors_Detected
= 0 then
7386 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
7388 -- Don't attempt to perform any cleanup actions if some other
7389 -- error was aready detected, since this can cause blowups.
7395 -- Case of package that does not need a body
7398 -- If the instantiation of the declaration is a library unit,
7399 -- rewrite the original package instantiation as a package
7400 -- declaration in the compilation unit node.
7402 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7403 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
7404 Rewrite
(Inst_Node
, Act_Decl
);
7406 -- Generate elaboration entity, in case spec has elaboration
7407 -- code. This cannot be done when the instance is analyzed,
7408 -- because it is not known yet whether the body exists.
7410 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
7411 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
7413 -- If the instantiation is not a library unit, then append the
7414 -- declaration to the list of implicitly generated entities.
7415 -- unless it is already a list member which means that it was
7416 -- already processed
7418 elsif not Is_List_Member
(Act_Decl
) then
7419 Mark_Rewrite_Insertion
(Act_Decl
);
7420 Insert_Before
(Inst_Node
, Act_Decl
);
7424 Expander_Mode_Restore
;
7425 end Instantiate_Package_Body
;
7427 ---------------------------------
7428 -- Instantiate_Subprogram_Body --
7429 ---------------------------------
7431 procedure Instantiate_Subprogram_Body
7432 (Body_Info
: Pending_Body_Info
)
7434 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7435 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7436 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7437 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7438 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7439 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7440 Anon_Id
: constant Entity_Id
:=
7441 Defining_Unit_Name
(Specification
(Act_Decl
));
7442 Pack_Id
: constant Entity_Id
:=
7443 Defining_Unit_Name
(Parent
(Act_Decl
));
7446 Gen_Body_Id
: Node_Id
;
7448 Act_Body_Id
: Entity_Id
;
7449 Pack_Body
: Node_Id
;
7450 Prev_Formal
: Entity_Id
;
7452 Unit_Renaming
: Node_Id
;
7454 Parent_Installed
: Boolean := False;
7455 Save_Style_Check
: constant Boolean := Style_Check
;
7458 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7460 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7462 if No
(Gen_Body_Id
) then
7463 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7464 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7467 Instantiation_Node
:= Inst_Node
;
7469 if Present
(Gen_Body_Id
) then
7470 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7472 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
7474 -- Either body is not present, or context is non-expanding, as
7475 -- when compiling a subunit. Mark the instance as completed, and
7476 -- diagnose a missing body when needed.
7479 and then Operating_Mode
= Generate_Code
7482 ("missing proper body for instantiation", Gen_Body
);
7485 Set_Has_Completion
(Anon_Id
);
7489 Save_Env
(Gen_Unit
, Anon_Id
);
7490 Style_Check
:= False;
7491 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7492 Create_Instantiation_Source
7500 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7501 Act_Body_Id
:= Defining_Entity
(Act_Body
);
7502 Set_Chars
(Act_Body_Id
, Chars
(Anon_Id
));
7503 Set_Sloc
(Act_Body_Id
, Sloc
(Defining_Entity
(Inst_Node
)));
7504 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
7505 Set_Has_Completion
(Anon_Id
);
7506 Check_Generic_Actuals
(Pack_Id
, False);
7508 -- If it is a child unit, make the parent instance (which is an
7509 -- instance of the parent of the generic) visible. The parent
7510 -- instance is the prefix of the name of the generic unit.
7512 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7513 and then Nkind
(Gen_Id
) = N_Expanded_Name
7515 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7516 Parent_Installed
:= True;
7518 elsif Is_Child_Unit
(Gen_Unit
) then
7519 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7520 Parent_Installed
:= True;
7523 -- Inside its body, a reference to the generic unit is a reference
7524 -- to the instance. The corresponding renaming is the first
7525 -- declaration in the body.
7528 Make_Subprogram_Renaming_Declaration
(Loc
,
7531 Specification
(Original_Node
(Gen_Body
)),
7533 Instantiating
=> True),
7534 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7536 -- If there is a formal subprogram with the same name as the
7537 -- unit itself, do not add this renaming declaration. This is
7538 -- a temporary fix for one ACVC test. ???
7540 Prev_Formal
:= First_Entity
(Pack_Id
);
7541 while Present
(Prev_Formal
) loop
7542 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
7543 and then Is_Overloadable
(Prev_Formal
)
7548 Next_Entity
(Prev_Formal
);
7551 if Present
(Prev_Formal
) then
7552 Decls
:= New_List
(Act_Body
);
7554 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
7557 -- The subprogram body is placed in the body of a dummy package
7558 -- body, whose spec contains the subprogram declaration as well
7559 -- as the renaming declarations for the generic parameters.
7561 Pack_Body
:= Make_Package_Body
(Loc
,
7562 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7563 Declarations
=> Decls
);
7565 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7567 -- If the instantiation is a library unit, then build resulting
7568 -- compilation unit nodes for the instance. The declaration of
7569 -- the enclosing package is the grandparent of the subprogram
7570 -- declaration. First replace the instantiation node as the unit
7571 -- of the corresponding compilation.
7573 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7574 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7575 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
7576 Build_Instance_Compilation_Unit_Nodes
7577 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
7578 Analyze
(Inst_Node
);
7580 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
7581 Analyze
(Pack_Body
);
7585 Insert_Before
(Inst_Node
, Pack_Body
);
7586 Mark_Rewrite_Insertion
(Pack_Body
);
7587 Analyze
(Pack_Body
);
7589 if Expander_Active
then
7590 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
7594 if not Generic_Separately_Compiled
(Gen_Unit
) then
7595 Inherit_Context
(Gen_Body
, Inst_Node
);
7598 Restore_Private_Views
(Pack_Id
, False);
7600 if Parent_Installed
then
7601 Remove_Parent
(In_Body
=> True);
7605 Style_Check
:= Save_Style_Check
;
7607 -- Body not found. Error was emitted already. If there were no
7608 -- previous errors, this may be an instance whose scope is a premature
7609 -- instance. In that case we must insure that the (legal) program does
7610 -- raise program error if executed. We generate a subprogram body for
7611 -- this purpose. See DEC ac30vso.
7613 elsif Serious_Errors_Detected
= 0
7614 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
7616 if Ekind
(Anon_Id
) = E_Procedure
then
7618 Make_Subprogram_Body
(Loc
,
7620 Make_Procedure_Specification
(Loc
,
7621 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7622 Parameter_Specifications
=>
7624 (Parameter_Specifications
(Parent
(Anon_Id
)))),
7626 Declarations
=> Empty_List
,
7627 Handled_Statement_Sequence
=>
7628 Make_Handled_Sequence_Of_Statements
(Loc
,
7631 Make_Raise_Program_Error
(Loc
,
7633 PE_Access_Before_Elaboration
))));
7637 Make_Raise_Program_Error
(Loc
,
7638 Reason
=> PE_Access_Before_Elaboration
);
7640 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
7641 Set_Analyzed
(Ret_Expr
);
7644 Make_Subprogram_Body
(Loc
,
7646 Make_Function_Specification
(Loc
,
7647 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7648 Parameter_Specifications
=>
7650 (Parameter_Specifications
(Parent
(Anon_Id
))),
7652 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
7654 Declarations
=> Empty_List
,
7655 Handled_Statement_Sequence
=>
7656 Make_Handled_Sequence_Of_Statements
(Loc
,
7658 New_List
(Make_Return_Statement
(Loc
, Ret_Expr
))));
7661 Pack_Body
:= Make_Package_Body
(Loc
,
7662 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7663 Declarations
=> New_List
(Act_Body
));
7665 Insert_After
(Inst_Node
, Pack_Body
);
7666 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7667 Analyze
(Pack_Body
);
7670 Expander_Mode_Restore
;
7671 end Instantiate_Subprogram_Body
;
7673 ----------------------
7674 -- Instantiate_Type --
7675 ----------------------
7677 function Instantiate_Type
7680 Analyzed_Formal
: Node_Id
;
7681 Actual_Decls
: List_Id
) return Node_Id
7683 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7684 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7685 A_Gen_T
: constant Entity_Id
:= Defining_Identifier
(Analyzed_Formal
);
7686 Ancestor
: Entity_Id
:= Empty
;
7687 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
7689 Decl_Node
: Node_Id
;
7691 procedure Validate_Array_Type_Instance
;
7692 procedure Validate_Access_Subprogram_Instance
;
7693 procedure Validate_Access_Type_Instance
;
7694 procedure Validate_Derived_Type_Instance
;
7695 procedure Validate_Private_Type_Instance
;
7696 -- These procedures perform validation tests for the named case
7698 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
7699 -- Check that base types are the same and that the subtypes match
7700 -- statically. Used in several of the above.
7702 --------------------
7703 -- Subtypes_Match --
7704 --------------------
7706 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
7707 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
7710 return (Base_Type
(T
) = Base_Type
(Act_T
)
7711 -- why is the and then commented out here???
7712 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7713 and then Subtypes_Statically_Match
(T
, Act_T
))
7715 or else (Is_Class_Wide_Type
(Gen_T
)
7716 and then Is_Class_Wide_Type
(Act_T
)
7719 Get_Instance_Of
(Root_Type
(Gen_T
)),
7720 Root_Type
(Act_T
)));
7723 -----------------------------------------
7724 -- Validate_Access_Subprogram_Instance --
7725 -----------------------------------------
7727 procedure Validate_Access_Subprogram_Instance
is
7729 if not Is_Access_Type
(Act_T
)
7730 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
7733 ("expect access type in instantiation of &", Actual
, Gen_T
);
7734 Abandon_Instantiation
(Actual
);
7737 Check_Mode_Conformant
7738 (Designated_Type
(Act_T
),
7739 Designated_Type
(A_Gen_T
),
7743 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
7744 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
7746 ("protected access type not allowed for formal &",
7750 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
7752 ("expect protected access type for formal &",
7755 end Validate_Access_Subprogram_Instance
;
7757 -----------------------------------
7758 -- Validate_Access_Type_Instance --
7759 -----------------------------------
7761 procedure Validate_Access_Type_Instance
is
7762 Desig_Type
: constant Entity_Id
:=
7764 (Designated_Type
(A_Gen_T
), Scope
(A_Gen_T
));
7767 if not Is_Access_Type
(Act_T
) then
7769 ("expect access type in instantiation of &", Actual
, Gen_T
);
7770 Abandon_Instantiation
(Actual
);
7773 if Is_Access_Constant
(A_Gen_T
) then
7774 if not Is_Access_Constant
(Act_T
) then
7776 ("actual type must be access-to-constant type", Actual
);
7777 Abandon_Instantiation
(Actual
);
7780 if Is_Access_Constant
(Act_T
) then
7782 ("actual type must be access-to-variable type", Actual
);
7783 Abandon_Instantiation
(Actual
);
7785 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
7786 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
7788 Error_Msg_N
("actual must be general access type!", Actual
);
7789 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
7790 Abandon_Instantiation
(Actual
);
7794 -- The designated subtypes, that is to say the subtypes introduced
7795 -- by an access type declaration (and not by a subtype declaration)
7798 if not Subtypes_Match
7799 (Desig_Type
, Designated_Type
(Base_Type
(Act_T
)))
7802 ("designated type of actual does not match that of formal &",
7804 Abandon_Instantiation
(Actual
);
7806 elsif Is_Access_Type
(Designated_Type
(Act_T
))
7807 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
7809 Is_Constrained
(Designated_Type
(Desig_Type
))
7812 ("designated type of actual does not match that of formal &",
7814 Abandon_Instantiation
(Actual
);
7816 end Validate_Access_Type_Instance
;
7818 ----------------------------------
7819 -- Validate_Array_Type_Instance --
7820 ----------------------------------
7822 procedure Validate_Array_Type_Instance
is
7827 function Formal_Dimensions
return Int
;
7828 -- Count number of dimensions in array type formal
7830 -----------------------
7831 -- Formal_Dimensions --
7832 -----------------------
7834 function Formal_Dimensions
return Int
is
7839 if Nkind
(Def
) = N_Constrained_Array_Definition
then
7840 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
7842 Index
:= First
(Subtype_Marks
(Def
));
7845 while Present
(Index
) loop
7851 end Formal_Dimensions
;
7853 -- Start of processing for Validate_Array_Type_Instance
7856 if not Is_Array_Type
(Act_T
) then
7858 ("expect array type in instantiation of &", Actual
, Gen_T
);
7859 Abandon_Instantiation
(Actual
);
7861 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
7862 if not (Is_Constrained
(Act_T
)) then
7864 ("expect constrained array in instantiation of &",
7866 Abandon_Instantiation
(Actual
);
7870 if Is_Constrained
(Act_T
) then
7872 ("expect unconstrained array in instantiation of &",
7874 Abandon_Instantiation
(Actual
);
7878 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
7880 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
7881 Abandon_Instantiation
(Actual
);
7884 I1
:= First_Index
(A_Gen_T
);
7885 I2
:= First_Index
(Act_T
);
7886 for J
in 1 .. Formal_Dimensions
loop
7888 -- If the indices of the actual were given by a subtype_mark,
7889 -- the index was transformed into a range attribute. Retrieve
7890 -- the original type mark for checking.
7892 if Is_Entity_Name
(Original_Node
(I2
)) then
7893 T2
:= Entity
(Original_Node
(I2
));
7898 if not Subtypes_Match
7899 (Find_Actual_Type
(Etype
(I1
), Scope
(A_Gen_T
)), T2
)
7902 ("index types of actual do not match those of formal &",
7904 Abandon_Instantiation
(Actual
);
7911 if not Subtypes_Match
(
7912 Find_Actual_Type
(Component_Type
(A_Gen_T
), Scope
(A_Gen_T
)),
7913 Component_Type
(Act_T
))
7916 ("component subtype of actual does not match that of formal &",
7918 Abandon_Instantiation
(Actual
);
7921 if Has_Aliased_Components
(A_Gen_T
)
7922 and then not Has_Aliased_Components
(Act_T
)
7925 ("actual must have aliased components to match formal type &",
7929 end Validate_Array_Type_Instance
;
7931 ------------------------------------
7932 -- Validate_Derived_Type_Instance --
7933 ------------------------------------
7935 procedure Validate_Derived_Type_Instance
is
7936 Actual_Discr
: Entity_Id
;
7937 Ancestor_Discr
: Entity_Id
;
7940 -- If the parent type in the generic declaration is itself
7941 -- a previous formal type, then it is local to the generic
7942 -- and absent from the analyzed generic definition. In that
7943 -- case the ancestor is the instance of the formal (which must
7944 -- have been instantiated previously), unless the ancestor is
7945 -- itself a formal derived type. In this latter case (which is the
7946 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
7947 -- formals is the ancestor of its parent. Otherwise, the analyzed
7948 -- generic carries the parent type. If the parent type is defined
7949 -- in a previous formal package, then the scope of that formal
7950 -- package is that of the generic type itself, and it has already
7951 -- been mapped into the corresponding type in the actual package.
7953 -- Common case: parent type defined outside of the generic
7955 if Is_Entity_Name
(Subtype_Mark
(Def
))
7956 and then Present
(Entity
(Subtype_Mark
(Def
)))
7958 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
7960 -- Check whether parent is defined in a previous formal package
7963 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
7966 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
7968 -- The type may be a local derivation, or a type extension of
7969 -- a previous formal, or of a formal of a parent package.
7971 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
7973 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
7975 -- Check whether the parent is another derived formal type
7976 -- in the same generic unit.
7978 if Etype
(A_Gen_T
) /= A_Gen_T
7979 and then Is_Generic_Type
(Etype
(A_Gen_T
))
7980 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
7981 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
7983 -- Locate ancestor of parent from the subtype declaration
7984 -- created for the actual.
7990 Decl
:= First
(Actual_Decls
);
7991 while Present
(Decl
) loop
7992 if Nkind
(Decl
) = N_Subtype_Declaration
7993 and then Chars
(Defining_Identifier
(Decl
)) =
7994 Chars
(Etype
(A_Gen_T
))
7996 Ancestor
:= Generic_Parent_Type
(Decl
);
8004 pragma Assert
(Present
(Ancestor
));
8008 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
8012 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
8015 if not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
8017 ("expect type derived from & in instantiation",
8018 Actual
, First_Subtype
(Ancestor
));
8019 Abandon_Instantiation
(Actual
);
8022 -- Perform atomic/volatile checks (RM C.6(12))
8024 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
8026 ("cannot have atomic actual type for non-atomic formal type",
8029 elsif Is_Volatile
(Act_T
)
8030 and then not Is_Volatile
(Ancestor
)
8031 and then Is_By_Reference_Type
(Ancestor
)
8034 ("cannot have volatile actual type for non-volatile formal type",
8038 -- It should not be necessary to check for unknown discriminants
8039 -- on Formal, but for some reason Has_Unknown_Discriminants is
8040 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8041 -- returns False. This needs fixing. ???
8043 if not Is_Indefinite_Subtype
(A_Gen_T
)
8044 and then not Unknown_Discriminants_Present
(Formal
)
8045 and then Is_Indefinite_Subtype
(Act_T
)
8048 ("actual subtype must be constrained", Actual
);
8049 Abandon_Instantiation
(Actual
);
8052 if not Unknown_Discriminants_Present
(Formal
) then
8053 if Is_Constrained
(Ancestor
) then
8054 if not Is_Constrained
(Act_T
) then
8056 ("actual subtype must be constrained", Actual
);
8057 Abandon_Instantiation
(Actual
);
8060 -- Ancestor is unconstrained
8062 elsif Is_Constrained
(Act_T
) then
8063 if Ekind
(Ancestor
) = E_Access_Type
8064 or else Is_Composite_Type
(Ancestor
)
8067 ("actual subtype must be unconstrained", Actual
);
8068 Abandon_Instantiation
(Actual
);
8071 -- A class-wide type is only allowed if the formal has
8072 -- unknown discriminants.
8074 elsif Is_Class_Wide_Type
(Act_T
)
8075 and then not Has_Unknown_Discriminants
(Ancestor
)
8078 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
8079 Abandon_Instantiation
(Actual
);
8081 -- Otherwise, the formal and actual shall have the same
8082 -- number of discriminants and each discriminant of the
8083 -- actual must correspond to a discriminant of the formal.
8085 elsif Has_Discriminants
(Act_T
)
8086 and then not Has_Unknown_Discriminants
(Act_T
)
8087 and then Has_Discriminants
(Ancestor
)
8089 Actual_Discr
:= First_Discriminant
(Act_T
);
8090 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
8091 while Present
(Actual_Discr
)
8092 and then Present
(Ancestor_Discr
)
8094 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
8095 not Present
(Corresponding_Discriminant
(Actual_Discr
))
8098 ("discriminant & does not correspond " &
8099 "to ancestor discriminant", Actual
, Actual_Discr
);
8100 Abandon_Instantiation
(Actual
);
8103 Next_Discriminant
(Actual_Discr
);
8104 Next_Discriminant
(Ancestor_Discr
);
8107 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
8109 ("actual for & must have same number of discriminants",
8111 Abandon_Instantiation
(Actual
);
8114 -- This case should be caught by the earlier check for
8115 -- for constrainedness, but the check here is added for
8118 elsif Has_Discriminants
(Act_T
)
8119 and then not Has_Unknown_Discriminants
(Act_T
)
8122 ("actual for & must not have discriminants", Actual
, Gen_T
);
8123 Abandon_Instantiation
(Actual
);
8125 elsif Has_Discriminants
(Ancestor
) then
8127 ("actual for & must have known discriminants", Actual
, Gen_T
);
8128 Abandon_Instantiation
(Actual
);
8131 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
8133 ("constraint on actual is incompatible with formal", Actual
);
8134 Abandon_Instantiation
(Actual
);
8137 end Validate_Derived_Type_Instance
;
8139 ------------------------------------
8140 -- Validate_Private_Type_Instance --
8141 ------------------------------------
8143 procedure Validate_Private_Type_Instance
is
8144 Formal_Discr
: Entity_Id
;
8145 Actual_Discr
: Entity_Id
;
8146 Formal_Subt
: Entity_Id
;
8149 if Is_Limited_Type
(Act_T
)
8150 and then not Is_Limited_Type
(A_Gen_T
)
8153 ("actual for non-limited & cannot be a limited type", Actual
,
8155 Explain_Limited_Type
(Act_T
, Actual
);
8156 Abandon_Instantiation
(Actual
);
8158 elsif Is_Indefinite_Subtype
(Act_T
)
8159 and then not Is_Indefinite_Subtype
(A_Gen_T
)
8160 and then Ada_Version
>= Ada_95
8163 ("actual for & must be a definite subtype", Actual
, Gen_T
);
8165 elsif not Is_Tagged_Type
(Act_T
)
8166 and then Is_Tagged_Type
(A_Gen_T
)
8169 ("actual for & must be a tagged type", Actual
, Gen_T
);
8171 elsif Has_Discriminants
(A_Gen_T
) then
8172 if not Has_Discriminants
(Act_T
) then
8174 ("actual for & must have discriminants", Actual
, Gen_T
);
8175 Abandon_Instantiation
(Actual
);
8177 elsif Is_Constrained
(Act_T
) then
8179 ("actual for & must be unconstrained", Actual
, Gen_T
);
8180 Abandon_Instantiation
(Actual
);
8183 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
8184 Actual_Discr
:= First_Discriminant
(Act_T
);
8185 while Formal_Discr
/= Empty
loop
8186 if Actual_Discr
= Empty
then
8188 ("discriminants on actual do not match formal",
8190 Abandon_Instantiation
(Actual
);
8193 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
8195 -- access discriminants match if designated types do.
8197 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
8198 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
))))
8199 = E_Anonymous_Access_Type
8200 and then Get_Instance_Of
(
8201 Designated_Type
(Base_Type
(Formal_Subt
)))
8202 = Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
8206 elsif Base_Type
(Formal_Subt
) /=
8207 Base_Type
(Etype
(Actual_Discr
))
8210 ("types of actual discriminants must match formal",
8212 Abandon_Instantiation
(Actual
);
8214 elsif not Subtypes_Statically_Match
8215 (Formal_Subt
, Etype
(Actual_Discr
))
8216 and then Ada_Version
>= Ada_95
8219 ("subtypes of actual discriminants must match formal",
8221 Abandon_Instantiation
(Actual
);
8224 Next_Discriminant
(Formal_Discr
);
8225 Next_Discriminant
(Actual_Discr
);
8228 if Actual_Discr
/= Empty
then
8230 ("discriminants on actual do not match formal",
8232 Abandon_Instantiation
(Actual
);
8239 end Validate_Private_Type_Instance
;
8241 -- Start of processing for Instantiate_Type
8244 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
8245 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
8248 elsif not Is_Entity_Name
(Actual
)
8249 or else not Is_Type
(Entity
(Actual
))
8252 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
8253 Abandon_Instantiation
(Actual
);
8256 Act_T
:= Entity
(Actual
);
8258 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8259 -- as a generic actual parameter if the corresponding formal type
8260 -- does not have a known_discriminant_part, or is a formal derived
8261 -- type that is an Unchecked_Union type.
8263 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
8264 if not Has_Discriminants
(A_Gen_T
)
8266 (Is_Derived_Type
(A_Gen_T
)
8268 Is_Unchecked_Union
(A_Gen_T
))
8272 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
8273 " discriminated formal type", Act_T
);
8278 -- Deal with fixed/floating restrictions
8280 if Is_Floating_Point_Type
(Act_T
) then
8281 Check_Restriction
(No_Floating_Point
, Actual
);
8282 elsif Is_Fixed_Point_Type
(Act_T
) then
8283 Check_Restriction
(No_Fixed_Point
, Actual
);
8286 -- Deal with error of using incomplete type as generic actual
8288 if Ekind
(Act_T
) = E_Incomplete_Type
then
8289 if No
(Underlying_Type
(Act_T
)) then
8290 Error_Msg_N
("premature use of incomplete type", Actual
);
8291 Abandon_Instantiation
(Actual
);
8293 Act_T
:= Full_View
(Act_T
);
8294 Set_Entity
(Actual
, Act_T
);
8296 if Has_Private_Component
(Act_T
) then
8298 ("premature use of type with private component", Actual
);
8302 -- Deal with error of premature use of private type as generic actual
8304 elsif Is_Private_Type
(Act_T
)
8305 and then Is_Private_Type
(Base_Type
(Act_T
))
8306 and then not Is_Generic_Type
(Act_T
)
8307 and then not Is_Derived_Type
(Act_T
)
8308 and then No
(Full_View
(Root_Type
(Act_T
)))
8310 Error_Msg_N
("premature use of private type", Actual
);
8312 elsif Has_Private_Component
(Act_T
) then
8314 ("premature use of type with private component", Actual
);
8317 Set_Instance_Of
(A_Gen_T
, Act_T
);
8319 -- If the type is generic, the class-wide type may also be used
8321 if Is_Tagged_Type
(A_Gen_T
)
8322 and then Is_Tagged_Type
(Act_T
)
8323 and then not Is_Class_Wide_Type
(A_Gen_T
)
8325 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
8326 Class_Wide_Type
(Act_T
));
8329 if not Is_Abstract
(A_Gen_T
)
8330 and then Is_Abstract
(Act_T
)
8333 ("actual of non-abstract formal cannot be abstract", Actual
);
8336 if Is_Scalar_Type
(Gen_T
) then
8337 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
8342 when N_Formal_Private_Type_Definition
=>
8343 Validate_Private_Type_Instance
;
8345 when N_Formal_Derived_Type_Definition
=>
8346 Validate_Derived_Type_Instance
;
8348 when N_Formal_Discrete_Type_Definition
=>
8349 if not Is_Discrete_Type
(Act_T
) then
8351 ("expect discrete type in instantiation of&", Actual
, Gen_T
);
8352 Abandon_Instantiation
(Actual
);
8355 when N_Formal_Signed_Integer_Type_Definition
=>
8356 if not Is_Signed_Integer_Type
(Act_T
) then
8358 ("expect signed integer type in instantiation of&",
8360 Abandon_Instantiation
(Actual
);
8363 when N_Formal_Modular_Type_Definition
=>
8364 if not Is_Modular_Integer_Type
(Act_T
) then
8366 ("expect modular type in instantiation of &", Actual
, Gen_T
);
8367 Abandon_Instantiation
(Actual
);
8370 when N_Formal_Floating_Point_Definition
=>
8371 if not Is_Floating_Point_Type
(Act_T
) then
8373 ("expect float type in instantiation of &", Actual
, Gen_T
);
8374 Abandon_Instantiation
(Actual
);
8377 when N_Formal_Ordinary_Fixed_Point_Definition
=>
8378 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
8380 ("expect ordinary fixed point type in instantiation of &",
8382 Abandon_Instantiation
(Actual
);
8385 when N_Formal_Decimal_Fixed_Point_Definition
=>
8386 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
8388 ("expect decimal type in instantiation of &",
8390 Abandon_Instantiation
(Actual
);
8393 when N_Array_Type_Definition
=>
8394 Validate_Array_Type_Instance
;
8396 when N_Access_To_Object_Definition
=>
8397 Validate_Access_Type_Instance
;
8399 when N_Access_Function_Definition |
8400 N_Access_Procedure_Definition
=>
8401 Validate_Access_Subprogram_Instance
;
8404 raise Program_Error
;
8409 Make_Subtype_Declaration
(Loc
,
8410 Defining_Identifier
=> New_Copy
(Gen_T
),
8411 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
8413 if Is_Private_Type
(Act_T
) then
8414 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8416 elsif Is_Access_Type
(Act_T
)
8417 and then Is_Private_Type
(Designated_Type
(Act_T
))
8419 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8422 -- Flag actual derived types so their elaboration produces the
8423 -- appropriate renamings for the primitive operations of the ancestor.
8424 -- Flag actual for formal private types as well, to determine whether
8425 -- operations in the private part may override inherited operations.
8427 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
8428 or else Nkind
(Def
) = N_Formal_Private_Type_Definition
8430 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
8434 end Instantiate_Type
;
8436 ---------------------
8437 -- Is_In_Main_Unit --
8438 ---------------------
8440 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
8441 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
8442 Current_Unit
: Node_Id
;
8445 if Unum
= Main_Unit
then
8448 -- If the current unit is a subunit then it is either the main unit
8449 -- or is being compiled as part of the main unit.
8451 elsif Nkind
(N
) = N_Compilation_Unit
then
8452 return Nkind
(Unit
(N
)) = N_Subunit
;
8455 Current_Unit
:= Parent
(N
);
8456 while Present
(Current_Unit
)
8457 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8459 Current_Unit
:= Parent
(Current_Unit
);
8462 -- The instantiation node is in the main unit, or else the current
8463 -- node (perhaps as the result of nested instantiations) is in the
8464 -- main unit, or in the declaration of the main unit, which in this
8465 -- last case must be a body.
8467 return Unum
= Main_Unit
8468 or else Current_Unit
= Cunit
(Main_Unit
)
8469 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
8470 or else (Present
(Library_Unit
(Current_Unit
))
8471 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
8472 end Is_In_Main_Unit
;
8474 ----------------------------
8475 -- Load_Parent_Of_Generic --
8476 ----------------------------
8478 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
) is
8479 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
8480 Save_Style_Check
: constant Boolean := Style_Check
;
8481 True_Parent
: Node_Id
;
8482 Inst_Node
: Node_Id
;
8486 if not In_Same_Source_Unit
(N
, Spec
)
8487 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
8488 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
8489 and then not Is_In_Main_Unit
(Spec
))
8491 -- Find body of parent of spec, and analyze it. A special case
8492 -- arises when the parent is an instantiation, that is to say when
8493 -- we are currently instantiating a nested generic. In that case,
8494 -- there is no separate file for the body of the enclosing instance.
8495 -- Instead, the enclosing body must be instantiated as if it were
8496 -- a pending instantiation, in order to produce the body for the
8497 -- nested generic we require now. Note that in that case the
8498 -- generic may be defined in a package body, the instance defined
8499 -- in the same package body, and the original enclosing body may not
8500 -- be in the main unit.
8502 True_Parent
:= Parent
(Spec
);
8505 while Present
(True_Parent
)
8506 and then Nkind
(True_Parent
) /= N_Compilation_Unit
8508 if Nkind
(True_Parent
) = N_Package_Declaration
8510 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
8512 -- Parent is a compilation unit that is an instantiation.
8513 -- Instantiation node has been replaced with package decl.
8515 Inst_Node
:= Original_Node
(True_Parent
);
8518 elsif Nkind
(True_Parent
) = N_Package_Declaration
8519 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
8520 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
8522 -- Parent is an instantiation within another specification.
8523 -- Declaration for instance has been inserted before original
8524 -- instantiation node. A direct link would be preferable?
8526 Inst_Node
:= Next
(True_Parent
);
8528 while Present
(Inst_Node
)
8529 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
8534 -- If the instance appears within a generic, and the generic
8535 -- unit is defined within a formal package of the enclosing
8536 -- generic, there is no generic body available, and none
8537 -- needed. A more precise test should be used ???
8539 if No
(Inst_Node
) then
8545 True_Parent
:= Parent
(True_Parent
);
8549 -- Case where we are currently instantiating a nested generic
8551 if Present
(Inst_Node
) then
8552 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
8554 -- Instantiation node and declaration of instantiated package
8555 -- were exchanged when only the declaration was needed.
8556 -- Restore instantiation node before proceeding with body.
8558 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
8561 -- Now complete instantiation of enclosing body, if it appears
8562 -- in some other unit. If it appears in the current unit, the
8563 -- body will have been instantiated already.
8565 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8567 -- We need to determine the expander mode to instantiate
8568 -- the enclosing body. Because the generic body we need
8569 -- may use global entities declared in the enclosing package
8570 -- (including aggregates) it is in general necessary to
8571 -- compile this body with expansion enabled. The exception
8572 -- is if we are within a generic package, in which case
8573 -- the usual generic rule applies.
8576 Exp_Status
: Boolean := True;
8580 -- Loop through scopes looking for generic package
8582 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
8583 while Present
(Scop
)
8584 and then Scop
/= Standard_Standard
8586 if Ekind
(Scop
) = E_Generic_Package
then
8587 Exp_Status
:= False;
8591 Scop
:= Scope
(Scop
);
8594 Instantiate_Package_Body
8595 (Pending_Body_Info
'(
8596 Inst_Node, True_Parent, Exp_Status,
8597 Get_Code_Unit (Sloc (Inst_Node))));
8601 -- Case where we are not instantiating a nested generic
8604 Opt.Style_Check := False;
8605 Expander_Mode_Save_And_Set (True);
8606 Load_Needed_Body (Comp_Unit, OK);
8607 Opt.Style_Check := Save_Style_Check;
8608 Expander_Mode_Restore;
8611 and then Unit_Requires_Body (Defining_Entity (Spec))
8614 Bname : constant Unit_Name_Type :=
8615 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8618 Error_Msg_Unit_1 := Bname;
8619 Error_Msg_N ("this instantiation requires$!", N);
8621 Get_File_Name (Bname, Subunit => False);
8622 Error_Msg_N ("\but file{ was not found!", N);
8623 raise Unrecoverable_Error;
8629 -- If loading the parent of the generic caused an instantiation
8630 -- circularity, we abandon compilation at this point, because
8631 -- otherwise in some cases we get into trouble with infinite
8632 -- recursions after this point.
8634 if Circularity_Detected then
8635 raise Unrecoverable_Error;
8637 end Load_Parent_Of_Generic;
8639 -----------------------
8640 -- Move_Freeze_Nodes --
8641 -----------------------
8643 procedure Move_Freeze_Nodes
8644 (Out_Of : Entity_Id;
8649 Next_Decl : Node_Id;
8650 Next_Node : Node_Id := After;
8653 function Is_Outer_Type (T : Entity_Id) return Boolean;
8654 -- Check whether entity is declared in a scope external to that
8655 -- of the generic unit.
8661 function Is_Outer_Type (T : Entity_Id) return Boolean is
8662 Scop : Entity_Id := Scope (T);
8665 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8669 while Scop /= Standard_Standard loop
8671 if Scop = Out_Of then
8674 Scop := Scope (Scop);
8682 -- Start of processing for Move_Freeze_Nodes
8689 -- First remove the freeze nodes that may appear before all other
8693 while Present (Decl)
8694 and then Nkind (Decl) = N_Freeze_Entity
8695 and then Is_Outer_Type (Entity (Decl))
8697 Decl := Remove_Head (L);
8698 Insert_After (Next_Node, Decl);
8699 Set_Analyzed (Decl, False);
8704 -- Next scan the list of declarations and remove each freeze node that
8705 -- appears ahead of the current node.
8707 while Present (Decl) loop
8708 while Present (Next (Decl))
8709 and then Nkind (Next (Decl)) = N_Freeze_Entity
8710 and then Is_Outer_Type (Entity (Next (Decl)))
8712 Next_Decl := Remove_Next (Decl);
8713 Insert_After (Next_Node, Next_Decl);
8714 Set_Analyzed (Next_Decl, False);
8715 Next_Node := Next_Decl;
8718 -- If the declaration is a nested package or concurrent type, then
8719 -- recurse. Nested generic packages will have been processed from the
8722 if Nkind (Decl) = N_Package_Declaration then
8723 Spec := Specification (Decl);
8725 elsif Nkind (Decl) = N_Task_Type_Declaration then
8726 Spec := Task_Definition (Decl);
8728 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8729 Spec := Protected_Definition (Decl);
8735 if Present (Spec) then
8736 Move_Freeze_Nodes (Out_Of, Next_Node,
8737 Visible_Declarations (Spec));
8738 Move_Freeze_Nodes (Out_Of, Next_Node,
8739 Private_Declarations (Spec));
8744 end Move_Freeze_Nodes;
8750 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8752 return Generic_Renamings.Table (E).Next_In_HTable;
8755 ------------------------
8756 -- Preanalyze_Actuals --
8757 ------------------------
8759 procedure Pre_Analyze_Actuals (N : Node_Id) is
8762 Errs : constant Int := Serious_Errors_Detected;
8765 Assoc := First (Generic_Associations (N));
8767 while Present (Assoc) loop
8768 Act := Explicit_Generic_Actual_Parameter (Assoc);
8770 -- Within a nested instantiation, a defaulted actual is an
8771 -- empty association, so nothing to analyze. If the actual for
8772 -- a subprogram is an attribute, analyze prefix only, because
8773 -- actual is not a complete attribute reference.
8775 -- If actual is an allocator, analyze expression only. The full
8776 -- analysis can generate code, and if the instance is a compilation
8777 -- unit we have to wait until the package instance is installed to
8778 -- have a proper place to insert this code.
8780 -- String literals may be operators, but at this point we do not
8781 -- know whether the actual is a formal subprogram or a string.
8786 elsif Nkind (Act) = N_Attribute_Reference then
8787 Analyze (Prefix (Act));
8789 elsif Nkind (Act) = N_Explicit_Dereference then
8790 Analyze (Prefix (Act));
8792 elsif Nkind (Act) = N_Allocator then
8794 Expr : constant Node_Id := Expression (Act);
8797 if Nkind (Expr) = N_Subtype_Indication then
8798 Analyze (Subtype_Mark (Expr));
8799 Analyze_List (Constraints (Constraint (Expr)));
8805 elsif Nkind (Act) /= N_Operator_Symbol then
8809 if Errs /= Serious_Errors_Detected then
8810 Abandon_Instantiation (Act);
8815 end Pre_Analyze_Actuals;
8821 procedure Remove_Parent (In_Body : Boolean := False) is
8822 S : Entity_Id := Current_Scope;
8828 -- After child instantiation is complete, remove from scope stack
8829 -- the extra copy of the current scope, and then remove parent
8835 while Current_Scope /= S loop
8837 End_Package_Scope (Current_Scope);
8839 if In_Open_Scopes (P) then
8840 E := First_Entity (P);
8842 while Present (E) loop
8843 Set_Is_Immediately_Visible (E, True);
8847 if Is_Generic_Instance (Current_Scope)
8848 and then P /= Current_Scope
8850 -- We are within an instance of some sibling. Retain
8851 -- visibility of parent, for proper subsequent cleanup.
8853 Set_In_Private_Part (P);
8856 -- This looks incomplete: what about compilation units that
8857 -- were made visible by Install_Parent but should not remain
8858 -- visible??? Standard is on the scope stack.
8860 elsif not In_Open_Scopes (Scope (P)) then
8861 Set_Is_Immediately_Visible (P, False);
8865 -- Reset visibility of entities in the enclosing scope.
8867 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8868 Hidden := First_Elmt (Hidden_Entities);
8870 while Present (Hidden) loop
8871 Set_Is_Immediately_Visible (Node (Hidden), True);
8876 -- Each body is analyzed separately, and there is no context
8877 -- that needs preserving from one body instance to the next,
8878 -- so remove all parent scopes that have been installed.
8880 while Present (S) loop
8881 End_Package_Scope (S);
8882 Set_Is_Immediately_Visible (S, False);
8884 exit when S = Standard_Standard;
8894 procedure Restore_Env is
8895 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8898 Ada_Version := Saved.Ada_Version;
8900 if No (Current_Instantiated_Parent.Act_Id) then
8902 -- Restore environment after subprogram inlining
8904 Restore_Private_Views (Empty);
8907 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8908 Exchanged_Views := Saved.Exchanged_Views;
8909 Hidden_Entities := Saved.Hidden_Entities;
8910 Current_Sem_Unit := Saved.Current_Sem_Unit;
8912 Instance_Envs.Decrement_Last;
8915 ---------------------------
8916 -- Restore_Private_Views --
8917 ---------------------------
8919 procedure Restore_Private_Views
8920 (Pack_Id : Entity_Id;
8921 Is_Package : Boolean := True)
8929 procedure Restore_Nested_Formal (Formal : Entity_Id);
8930 -- Hide the generic formals of formal packages declared with box
8931 -- which were reachable in the current instantiation.
8933 procedure Restore_Nested_Formal (Formal : Entity_Id) is
8936 if Present (Renamed_Object (Formal))
8937 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
8941 elsif Present (Associated_Formal_Package (Formal))
8942 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
8944 Ent := First_Entity (Formal);
8946 while Present (Ent) loop
8947 exit when Ekind (Ent) = E_Package
8948 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
8950 Set_Is_Hidden (Ent);
8951 Set_Is_Potentially_Use_Visible (Ent, False);
8953 if Ekind (Ent) = E_Package then
8955 Restore_Nested_Formal (Ent);
8961 end Restore_Nested_Formal;
8964 M := First_Elmt (Exchanged_Views);
8965 while Present (M) loop
8968 -- Subtypes of types whose views have been exchanged, and that
8969 -- are defined within the instance, were not on the list of
8970 -- Private_Dependents on entry to the instance, so they have to
8971 -- be exchanged explicitly now, in order to remain consistent with
8972 -- the view of the parent type.
8974 if Ekind (Typ) = E_Private_Type
8975 or else Ekind (Typ) = E_Limited_Private_Type
8976 or else Ekind (Typ) = E_Record_Type_With_Private
8978 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8980 while Present (Dep_Elmt) loop
8981 Dep_Typ := Node (Dep_Elmt);
8983 if Scope (Dep_Typ) = Pack_Id
8984 and then Present (Full_View (Dep_Typ))
8986 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8987 Exchange_Declarations (Dep_Typ);
8990 Next_Elmt (Dep_Elmt);
8994 Exchange_Declarations (Node (M));
8998 if No (Pack_Id) then
9002 -- Make the generic formal parameters private, and make the formal
9003 -- types into subtypes of the actuals again.
9005 E := First_Entity (Pack_Id);
9007 while Present (E) loop
9008 Set_Is_Hidden (E, True);
9011 and then Nkind (Parent (E)) = N_Subtype_Declaration
9013 Set_Is_Generic_Actual_Type (E, False);
9015 -- An unusual case of aliasing: the actual may also be directly
9016 -- visible in the generic, and be private there, while it is
9017 -- fully visible in the context of the instance. The internal
9018 -- subtype is private in the instance, but has full visibility
9019 -- like its parent in the enclosing scope. This enforces the
9020 -- invariant that the privacy status of all private dependents of
9021 -- a type coincide with that of the parent type. This can only
9022 -- happen when a generic child unit is instantiated within a
9025 if Is_Private_Type (E)
9026 and then not Is_Private_Type (Etype (E))
9028 Exchange_Declarations (E);
9031 elsif Ekind (E) = E_Package then
9033 -- The end of the renaming list is the renaming of the generic
9034 -- package itself. If the instance is a subprogram, all entities
9035 -- in the corresponding package are renamings. If this entity is
9036 -- a formal package, make its own formals private as well. The
9037 -- actual in this case is itself the renaming of an instantation.
9038 -- If the entity is not a package renaming, it is the entity
9039 -- created to validate formal package actuals: ignore.
9041 -- If the actual is itself a formal package for the enclosing
9042 -- generic, or the actual for such a formal package, it remains
9043 -- visible on exit from the instance, and therefore nothing
9044 -- needs to be done either, except to keep it accessible.
9047 and then Renamed_Object (E) = Pack_Id
9051 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9054 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9055 Set_Is_Hidden (E, False);
9059 Act_P : constant Entity_Id := Renamed_Object (E);
9063 Id := First_Entity (Act_P);
9065 and then Id /= First_Private_Entity (Act_P)
9067 exit when Ekind (Id) = E_Package
9068 and then Renamed_Object (Id) = Act_P;
9070 Set_Is_Hidden (Id, True);
9071 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9073 if Ekind (Id) = E_Package then
9074 Restore_Nested_Formal (Id);
9085 end Restore_Private_Views;
9092 (Gen_Unit : Entity_Id;
9093 Act_Unit : Entity_Id)
9097 Set_Instance_Env (Gen_Unit, Act_Unit);
9100 ----------------------------
9101 -- Save_Global_References --
9102 ----------------------------
9104 procedure Save_Global_References (N : Node_Id) is
9105 Gen_Scope : Entity_Id;
9109 function Is_Global (E : Entity_Id) return Boolean;
9110 -- Check whether entity is defined outside of generic unit.
9111 -- Examine the scope of an entity, and the scope of the scope,
9112 -- etc, until we find either Standard, in which case the entity
9113 -- is global, or the generic unit itself, which indicates that
9114 -- the entity is local. If the entity is the generic unit itself,
9115 -- as in the case of a recursive call, or the enclosing generic unit,
9116 -- if different from the current scope, then it is local as well,
9117 -- because it will be replaced at the point of instantiation. On
9118 -- the other hand, if it is a reference to a child unit of a common
9119 -- ancestor, which appears in an instantiation, it is global because
9120 -- it is used to denote a specific compilation unit at the time the
9121 -- instantiations will be analyzed.
9123 procedure Reset_Entity (N : Node_Id);
9124 -- Save semantic information on global entity, so that it is not
9125 -- resolved again at instantiation time.
9127 procedure Save_Entity_Descendants (N : Node_Id);
9128 -- Apply Save_Global_References to the two syntactic descendants of
9129 -- non-terminal nodes that carry an Associated_Node and are processed
9130 -- through Reset_Entity. Once the global entity (if any) has been
9131 -- captured together with its type, only two syntactic descendants
9132 -- need to be traversed to complete the processing of the tree rooted
9133 -- at N. This applies to Selected_Components, Expanded_Names, and to
9134 -- Operator nodes. N can also be a character literal, identifier, or
9135 -- operator symbol node, but the call has no effect in these cases.
9137 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9138 -- Default actuals in nested instances must be handled specially
9139 -- because there is no link to them from the original tree. When an
9140 -- actual subprogram is given by a default, we add an explicit generic
9141 -- association for it in the instantiation node. When we save the
9142 -- global references on the name of the instance, we recover the list
9143 -- of generic associations, and add an explicit one to the original
9144 -- generic tree, through which a global actual can be preserved.
9145 -- Similarly, if a child unit is instantiated within a sibling, in the
9146 -- context of the parent, we must preserve the identifier of the parent
9147 -- so that it can be properly resolved in a subsequent instantiation.
9149 procedure Save_Global_Descendant (D : Union_Id);
9150 -- Apply Save_Global_References recursively to the descendents of
9153 procedure Save_References (N : Node_Id);
9154 -- This is the recursive procedure that does the work, once the
9155 -- enclosing generic scope has been established.
9161 function Is_Global (E : Entity_Id) return Boolean is
9162 Se : Entity_Id := Scope (E);
9164 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9165 -- Determine whether the parent node of a reference to a child unit
9166 -- denotes an instantiation or a formal package, in which case the
9167 -- reference to the child unit is global, even if it appears within
9168 -- the current scope (e.g. when the instance appears within the body
9171 ----------------------
9172 -- Is_Instance_Node --
9173 ----------------------
9175 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9177 return (Nkind (Decl) in N_Generic_Instantiation
9179 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9180 end Is_Instance_Node;
9182 -- Start of processing for Is_Global
9185 if E = Gen_Scope then
9188 elsif E = Standard_Standard then
9191 elsif Is_Child_Unit (E)
9192 and then (Is_Instance_Node (Parent (N2))
9193 or else (Nkind (Parent (N2)) = N_Expanded_Name
9194 and then N2 = Selector_Name (Parent (N2))
9195 and then Is_Instance_Node (Parent (Parent (N2)))))
9200 while Se /= Gen_Scope loop
9201 if Se = Standard_Standard then
9216 procedure Reset_Entity (N : Node_Id) is
9218 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9219 -- The type of N2 is global to the generic unit. Save the
9220 -- type in the generic node.
9222 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9223 -- Find the ultimate ancestor of the current unit. If it is
9224 -- not a generic unit, then the name of the current unit
9225 -- in the prefix of an expanded name must be replaced with
9226 -- its generic homonym to ensure that it will be properly
9227 -- resolved in an instance.
9229 ---------------------
9230 -- Set_Global_Type --
9231 ---------------------
9233 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9234 Typ : constant Entity_Id := Etype (N2);
9240 and then Has_Private_View (Entity (N))
9242 -- If the entity of N is not the associated node, this is
9243 -- a nested generic and it has an associated node as well,
9244 -- whose type is already the full view (see below). Indicate
9245 -- that the original node has a private view.
9247 Set_Has_Private_View (N);
9250 -- If not a private type, nothing else to do
9252 if not Is_Private_Type (Typ) then
9253 if Is_Array_Type (Typ)
9254 and then Is_Private_Type (Component_Type (Typ))
9256 Set_Has_Private_View (N);
9259 -- If it is a derivation of a private type in a context where
9260 -- no full view is needed, nothing to do either.
9262 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9265 -- Otherwise mark the type for flipping and use the full_view
9269 Set_Has_Private_View (N);
9271 if Present (Full_View (Typ)) then
9272 Set_Etype (N2, Full_View (Typ));
9275 end Set_Global_Type;
9281 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9282 Par : Entity_Id := E;
9285 while Is_Child_Unit (Par) loop
9292 -- Start of processing for Reset_Entity
9295 N2 := Get_Associated_Node (N);
9299 if Is_Global (E) then
9300 Set_Global_Type (N, N2);
9302 elsif Nkind (N) = N_Op_Concat
9303 and then Is_Generic_Type (Etype (N2))
9305 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9306 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9307 and then Is_Intrinsic_Subprogram (E)
9312 -- Entity is local. Mark generic node as unresolved.
9313 -- Note that now it does not have an entity.
9315 Set_Associated_Node (N, Empty);
9316 Set_Etype (N, Empty);
9319 if (Nkind (Parent (N)) = N_Package_Instantiation
9320 or else Nkind (Parent (N)) = N_Function_Instantiation
9321 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9322 and then N = Name (Parent (N))
9324 Save_Global_Defaults (Parent (N), Parent (N2));
9327 elsif Nkind (Parent (N)) = N_Selected_Component
9328 and then Nkind (Parent (N2)) = N_Expanded_Name
9331 if Is_Global (Entity (Parent (N2))) then
9332 Change_Selected_Component_To_Expanded_Name (Parent (N));
9333 Set_Associated_Node (Parent (N), Parent (N2));
9334 Set_Global_Type (Parent (N), Parent (N2));
9335 Save_Entity_Descendants (N);
9337 -- If this is a reference to the current generic entity,
9338 -- replace by the name of the generic homonym of the current
9339 -- package. This is because in an instantiation Par.P.Q will
9340 -- not resolve to the name of the instance, whose enclosing
9341 -- scope is not necessarily Par. We use the generic homonym
9342 -- rather that the name of the generic itself, because it may
9343 -- be hidden by a local declaration.
9345 elsif In_Open_Scopes (Entity (Parent (N2)))
9347 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9349 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9350 Rewrite (Parent (N),
9351 Make_Identifier (Sloc (N),
9353 Chars (Generic_Homonym (Entity (Parent (N2))))));
9355 Rewrite (Parent (N),
9356 Make_Identifier (Sloc (N),
9357 Chars => Chars (Selector_Name (Parent (N2)))));
9361 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9362 or else Nkind (Parent (Parent (N)))
9363 = N_Function_Instantiation
9364 or else Nkind (Parent (Parent (N)))
9365 = N_Procedure_Instantiation)
9366 and then Parent (N) = Name (Parent (Parent (N)))
9368 Save_Global_Defaults
9369 (Parent (Parent (N)), Parent (Parent ((N2))));
9372 -- A selected component may denote a static constant that has
9373 -- been folded. Make the same replacement in original tree.
9375 elsif Nkind (Parent (N)) = N_Selected_Component
9376 and then (Nkind (Parent (N2)) = N_Integer_Literal
9377 or else Nkind (Parent (N2)) = N_Real_Literal)
9379 Rewrite (Parent (N),
9380 New_Copy (Parent (N2)));
9381 Set_Analyzed (Parent (N), False);
9383 -- A selected component may be transformed into a parameterless
9384 -- function call. If the called entity is global, rewrite the
9385 -- node appropriately, i.e. as an extended name for the global
9388 elsif Nkind (Parent (N)) = N_Selected_Component
9389 and then Nkind (Parent (N2)) = N_Function_Call
9390 and then Is_Global (Entity (Name (Parent (N2))))
9392 Change_Selected_Component_To_Expanded_Name (Parent (N));
9393 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9394 Set_Global_Type (Parent (N), Name (Parent (N2)));
9395 Save_Entity_Descendants (N);
9398 -- Entity is local. Reset in generic unit, so that node
9399 -- is resolved anew at the point of instantiation.
9401 Set_Associated_Node (N, Empty);
9402 Set_Etype (N, Empty);
9406 -----------------------------
9407 -- Save_Entity_Descendants --
9408 -----------------------------
9410 procedure Save_Entity_Descendants (N : Node_Id) is
9414 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9415 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9418 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9420 when N_Expanded_Name | N_Selected_Component =>
9421 Save_Global_Descendant (Union_Id (Prefix (N)));
9422 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9424 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9428 raise Program_Error;
9430 end Save_Entity_Descendants;
9432 --------------------------
9433 -- Save_Global_Defaults --
9434 --------------------------
9436 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9437 Loc : constant Source_Ptr := Sloc (N1);
9438 Assoc2 : constant List_Id := Generic_Associations (N2);
9439 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9449 Assoc1 := Generic_Associations (N1);
9451 if Present (Assoc1) then
9452 Act1 := First (Assoc1);
9455 Set_Generic_Associations (N1, New_List);
9456 Assoc1 := Generic_Associations (N1);
9459 if Present (Assoc2) then
9460 Act2 := First (Assoc2);
9465 while Present (Act1) and then Present (Act2) loop
9470 -- Find the associations added for default suprograms.
9472 if Present (Act2) then
9473 while Nkind (Act2) /= N_Generic_Association
9474 or else No (Entity (Selector_Name (Act2)))
9475 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9480 -- Add a similar association if the default is global. The
9481 -- renaming declaration for the actual has been analyzed, and
9482 -- its alias is the program it renames. Link the actual in the
9483 -- original generic tree with the node in the analyzed tree.
9485 while Present (Act2) loop
9486 Subp := Entity (Selector_Name (Act2));
9487 Def := Explicit_Generic_Actual_Parameter (Act2);
9489 -- Following test is defence against rubbish errors
9491 if No (Alias (Subp)) then
9495 -- Retrieve the resolved actual from the renaming declaration
9496 -- created for the instantiated formal.
9498 Actual := Entity (Name (Parent (Parent (Subp))));
9499 Set_Entity (Def, Actual);
9500 Set_Etype (Def, Etype (Actual));
9502 if Is_Global (Actual) then
9504 Make_Generic_Association (Loc,
9505 Selector_Name => New_Occurrence_Of (Subp, Loc),
9506 Explicit_Generic_Actual_Parameter =>
9507 New_Occurrence_Of (Actual, Loc));
9510 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9512 Append (Ndec, Assoc1);
9514 -- If there are other defaults, add a dummy association
9515 -- in case there are other defaulted formals with the same
9518 elsif Present (Next (Act2)) then
9520 Make_Generic_Association (Loc,
9521 Selector_Name => New_Occurrence_Of (Subp, Loc),
9522 Explicit_Generic_Actual_Parameter => Empty);
9524 Append (Ndec, Assoc1);
9531 if Nkind (Name (N1)) = N_Identifier
9532 and then Is_Child_Unit (Gen_Id)
9533 and then Is_Global (Gen_Id)
9534 and then Is_Generic_Unit (Scope (Gen_Id))
9535 and then In_Open_Scopes (Scope (Gen_Id))
9537 -- This is an instantiation of a child unit within a sibling,
9538 -- so that the generic parent is in scope. An eventual instance
9539 -- must occur within the scope of an instance of the parent.
9540 -- Make name in instance into an expanded name, to preserve the
9541 -- identifier of the parent, so it can be resolved subsequently.
9544 Make_Expanded_Name (Loc,
9545 Chars => Chars (Gen_Id),
9546 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9547 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9548 Set_Entity (Name (N2), Gen_Id);
9551 Make_Expanded_Name (Loc,
9552 Chars => Chars (Gen_Id),
9553 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9554 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9556 Set_Associated_Node (Name (N1), Name (N2));
9557 Set_Associated_Node (Prefix (Name (N1)), Empty);
9559 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9560 Set_Etype (Name (N1), Etype (Gen_Id));
9563 end Save_Global_Defaults;
9565 ----------------------------
9566 -- Save_Global_Descendant --
9567 ----------------------------
9569 procedure Save_Global_Descendant (D : Union_Id) is
9573 if D in Node_Range then
9574 if D = Union_Id (Empty) then
9577 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9578 Save_References (Node_Id (D));
9581 elsif D in List_Range then
9582 if D = Union_Id (No_List)
9583 or else Is_Empty_List (List_Id (D))
9588 N1 := First (List_Id (D));
9589 while Present (N1) loop
9590 Save_References (N1);
9595 -- Element list or other non-node field, nothing to do
9600 end Save_Global_Descendant;
9602 ---------------------
9603 -- Save_References --
9604 ---------------------
9606 -- This is the recursive procedure that does the work, once the
9607 -- enclosing generic scope has been established. We have to treat
9608 -- specially a number of node rewritings that are required by semantic
9609 -- processing and which change the kind of nodes in the generic copy:
9610 -- typically constant-folding, replacing an operator node by a string
9611 -- literal, or a selected component by an expanded name. In each of
9612 -- those cases, the transformation is propagated to the generic unit.
9614 procedure Save_References (N : Node_Id) is
9619 elsif Nkind (N) = N_Character_Literal
9620 or else Nkind (N) = N_Operator_Symbol
9622 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9625 elsif Nkind (N) = N_Operator_Symbol
9626 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9628 Change_Operator_Symbol_To_String_Literal (N);
9631 elsif Nkind (N) in N_Op then
9633 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9635 if Nkind (N) = N_Op_Concat then
9636 Set_Is_Component_Left_Opnd (N,
9637 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9639 Set_Is_Component_Right_Opnd (N,
9640 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9645 -- Node may be transformed into call to a user-defined operator
9647 N2 := Get_Associated_Node (N);
9649 if Nkind (N2) = N_Function_Call then
9650 E := Entity (Name (N2));
9653 and then Is_Global (E)
9655 Set_Etype (N, Etype (N2));
9657 Set_Associated_Node (N, Empty);
9658 Set_Etype (N, Empty);
9661 elsif Nkind (N2) = N_Integer_Literal
9662 or else Nkind (N2) = N_Real_Literal
9663 or else Nkind (N2) = N_String_Literal
9665 -- Operation was constant-folded, perform the same
9666 -- replacement in generic.
9668 Rewrite (N, New_Copy (N2));
9669 Set_Analyzed (N, False);
9671 elsif Nkind (N2) = N_Identifier
9672 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9674 -- Same if call was folded into a literal, but in this
9675 -- case retain the entity to avoid spurious ambiguities
9676 -- if id is overloaded at the point of instantiation or
9679 Rewrite (N, New_Copy (N2));
9680 Set_Analyzed (N, False);
9684 -- Complete the check on operands, if node has not been
9687 if Nkind (N) in N_Op then
9688 Save_Entity_Descendants (N);
9691 elsif Nkind (N) = N_Identifier then
9692 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9694 -- If this is a discriminant reference, always save it.
9695 -- It is used in the instance to find the corresponding
9696 -- discriminant positionally rather than by name.
9698 Set_Original_Discriminant
9699 (N, Original_Discriminant (Get_Associated_Node (N)));
9703 N2 := Get_Associated_Node (N);
9705 if Nkind (N2) = N_Function_Call then
9706 E := Entity (Name (N2));
9708 -- Name resolves to a call to parameterless function.
9709 -- If original entity is global, mark node as resolved.
9712 and then Is_Global (E)
9714 Set_Etype (N, Etype (N2));
9716 Set_Associated_Node (N, Empty);
9717 Set_Etype (N, Empty);
9721 Nkind (N2) = N_Integer_Literal or else
9722 Nkind (N2) = N_Real_Literal or else
9723 Nkind (N2) = N_String_Literal
9725 -- Name resolves to named number that is constant-folded,
9726 -- or to string literal from concatenation.
9727 -- Perform the same replacement in generic.
9729 Rewrite (N, New_Copy (N2));
9730 Set_Analyzed (N, False);
9732 elsif Nkind (N2) = N_Explicit_Dereference then
9734 -- An identifier is rewritten as a dereference if it is
9735 -- the prefix in a selected component, and it denotes an
9736 -- access to a composite type, or a parameterless function
9737 -- call that returns an access type.
9739 -- Check whether corresponding entity in prefix is global.
9741 if Is_Entity_Name (Prefix (N2))
9742 and then Present (Entity (Prefix (N2)))
9743 and then Is_Global (Entity (Prefix (N2)))
9746 Make_Explicit_Dereference (Sloc (N),
9747 Prefix => Make_Identifier (Sloc (N),
9748 Chars => Chars (N))));
9749 Set_Associated_Node (Prefix (N), Prefix (N2));
9751 elsif Nkind (Prefix (N2)) = N_Function_Call
9752 and then Is_Global (Entity (Name (Prefix (N2))))
9755 Make_Explicit_Dereference (Sloc (N),
9756 Prefix => Make_Function_Call (Sloc (N),
9758 Make_Identifier (Sloc (N),
9759 Chars => Chars (N)))));
9762 (Name (Prefix (N)), Name (Prefix (N2)));
9765 Set_Associated_Node (N, Empty);
9766 Set_Etype (N, Empty);
9769 -- The subtype mark of a nominally unconstrained object
9770 -- is rewritten as a subtype indication using the bounds
9771 -- of the expression. Recover the original subtype mark.
9773 elsif Nkind (N2) = N_Subtype_Indication
9774 and then Is_Entity_Name (Original_Node (N2))
9776 Set_Associated_Node (N, Original_Node (N2));
9784 elsif Nkind (N) in N_Entity then
9789 use Atree.Unchecked_Access;
9790 -- This code section is part of implementing an untyped tree
9791 -- traversal, so it needs direct access to node fields.
9794 if Nkind (N) = N_Aggregate
9796 Nkind (N) = N_Extension_Aggregate
9798 N2 := Get_Associated_Node (N);
9801 or else No (Etype (N2))
9802 or else not Is_Global (Etype (N2))
9804 Set_Associated_Node (N, Empty);
9807 Save_Global_Descendant (Field1 (N));
9808 Save_Global_Descendant (Field2 (N));
9809 Save_Global_Descendant (Field3 (N));
9810 Save_Global_Descendant (Field5 (N));
9812 -- All other cases than aggregates
9815 Save_Global_Descendant (Field1 (N));
9816 Save_Global_Descendant (Field2 (N));
9817 Save_Global_Descendant (Field3 (N));
9818 Save_Global_Descendant (Field4 (N));
9819 Save_Global_Descendant (Field5 (N));
9823 end Save_References;
9825 -- Start of processing for Save_Global_References
9828 Gen_Scope := Current_Scope;
9830 -- If the generic unit is a child unit, references to entities in
9831 -- the parent are treated as local, because they will be resolved
9832 -- anew in the context of the instance of the parent.
9834 while Is_Child_Unit (Gen_Scope)
9835 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9837 Gen_Scope := Scope (Gen_Scope);
9840 Save_References (N);
9841 end Save_Global_References;
9843 --------------------------------------
9844 -- Set_Copied_Sloc_For_Inlined_Body --
9845 --------------------------------------
9847 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9849 Create_Instantiation_Source (N, E, True, S_Adjustment);
9850 end Set_Copied_Sloc_For_Inlined_Body;
9852 ---------------------
9853 -- Set_Instance_Of --
9854 ---------------------
9856 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9858 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9859 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9860 Generic_Renamings.Increment_Last;
9861 end Set_Instance_Of;
9863 --------------------
9864 -- Set_Next_Assoc --
9865 --------------------
9867 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9869 Generic_Renamings.Table (E).Next_In_HTable := Next;
9876 procedure Start_Generic is
9878 -- ??? I am sure more things could be factored out in this
9879 -- routine. Should probably be done at a later stage.
9881 Generic_Flags.Increment_Last;
9882 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9883 Inside_A_Generic := True;
9885 Expander_Mode_Save_And_Set (False);
9888 ----------------------
9889 -- Set_Instance_Env --
9890 ----------------------
9892 procedure Set_Instance_Env
9893 (Gen_Unit : Entity_Id;
9894 Act_Unit : Entity_Id)
9898 -- Regardless of the current mode, predefined units are analyzed in
9899 -- the most current Ada mode, and earlier version Ada checks do not
9900 -- apply to predefined units.
9902 if Is_Internal_File_Name
9903 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
9904 Renamings_Included => True) then
9905 Ada_Version := Ada_Version_Type'Last;
9908 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
9909 end Set_Instance_Env;
9915 procedure Switch_View (T : Entity_Id) is
9916 BT : constant Entity_Id := Base_Type (T);
9917 Priv_Elmt : Elmt_Id := No_Elmt;
9918 Priv_Sub : Entity_Id;
9921 -- T may be private but its base type may have been exchanged through
9922 -- some other occurrence, in which case there is nothing to switch.
9924 if not Is_Private_Type (BT) then
9928 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9930 if Present (Full_View (BT)) then
9931 Append_Elmt (Full_View (BT), Exchanged_Views);
9932 Exchange_Declarations (BT);
9935 while Present (Priv_Elmt) loop
9936 Priv_Sub := (Node (Priv_Elmt));
9938 -- We avoid flipping the subtype if the Etype of its full
9939 -- view is private because this would result in a malformed
9940 -- subtype. This occurs when the Etype of the subtype full
9941 -- view is the full view of the base type (and since the
9942 -- base types were just switched, the subtype is pointing
9943 -- to the wrong view). This is currently the case for
9944 -- tagged record types, access types (maybe more?) and
9945 -- needs to be resolved. ???
9947 if Present (Full_View (Priv_Sub))
9948 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
9950 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
9951 Exchange_Declarations (Priv_Sub);
9954 Next_Elmt (Priv_Elmt);
9958 -----------------------------
9959 -- Valid_Default_Attribute --
9960 -----------------------------
9962 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
9963 Attr_Id : constant Attribute_Id :=
9964 Get_Attribute_Id (Attribute_Name (Def));
9965 T : constant Entity_Id := Entity (Prefix (Def));
9966 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
9979 F := First_Formal (Nam);
9980 while Present (F) loop
9986 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
9987 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
9988 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
9989 Attribute_Unbiased_Rounding =>
9992 and then Is_Floating_Point_Type (T);
9994 when Attribute_Image | Attribute_Pred | Attribute_Succ |
9995 Attribute_Value | Attribute_Wide_Image |
9996 Attribute_Wide_Value =>
9997 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9999 when Attribute_Max | Attribute_Min =>
10000 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10002 when Attribute_Input =>
10003 OK := (Is_Fun and then Num_F = 1);
10005 when Attribute_Output | Attribute_Read | Attribute_Write =>
10006 OK := (not Is_Fun and then Num_F = 2);
10013 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10016 end Valid_Default_Attribute;