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 function In_Main_Context
(E
: Entity_Id
) return Boolean;
404 -- Check whether an instantiation is in the context of the main unit.
405 -- Used to determine whether its body should be elaborated to allow
406 -- front-end inlining.
408 procedure Set_Instance_Env
409 (Gen_Unit
: Entity_Id
;
410 Act_Unit
: Entity_Id
);
411 -- Save current instance on saved environment, to be used to determine
412 -- the global status of entities in nested instances. Part of Save_Env.
413 -- called after verifying that the generic unit is legal for the instance.
415 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
416 -- Associate analyzed generic parameter with corresponding
417 -- instance. Used for semantic checks at instantiation time.
419 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
420 -- Traverse the Exchanged_Views list to see if a type was private
421 -- and has already been flipped during this phase of instantiation.
423 procedure Hide_Current_Scope
;
424 -- When compiling a generic child unit, the parent context must be
425 -- present, but the instance and all entities that may be generated
426 -- must be inserted in the current scope. We leave the current scope
427 -- on the stack, but make its entities invisible to avoid visibility
428 -- problems. This is reversed at the end of instantiations. This is
429 -- not done for the instantiation of the bodies, which only require the
430 -- instances of the generic parents to be in scope.
432 procedure Install_Body
437 -- If the instantiation happens textually before the body of the generic,
438 -- the instantiation of the body must be analyzed after the generic body,
439 -- and not at the point of instantiation. Such early instantiations can
440 -- happen if the generic and the instance appear in a package declaration
441 -- because the generic body can only appear in the corresponding package
442 -- body. Early instantiations can also appear if generic, instance and
443 -- body are all in the declarative part of a subprogram or entry. Entities
444 -- of packages that are early instantiations are delayed, and their freeze
445 -- node appears after the generic body.
447 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
448 -- Insert freeze node at the end of the declarative part that includes the
449 -- instance node N. If N is in the visible part of an enclosing package
450 -- declaration, the freeze node has to be inserted at the end of the
451 -- private declarations, if any.
453 procedure Freeze_Subprogram_Body
454 (Inst_Node
: Node_Id
;
456 Pack_Id
: Entity_Id
);
457 -- The generic body may appear textually after the instance, including
458 -- in the proper body of a stub, or within a different package instance.
459 -- Given that the instance can only be elaborated after the generic, we
460 -- place freeze_nodes for the instance and/or for packages that may enclose
461 -- the instance and the generic, so that the back-end can establish the
462 -- proper order of elaboration.
465 -- Establish environment for subsequent instantiation. Separated from
466 -- Save_Env because data-structures for visibility handling must be
467 -- initialized before call to Check_Generic_Child_Unit.
469 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
470 -- When compiling an instance of a child unit the parent (which is
471 -- itself an instance) is an enclosing scope that must be made
472 -- immediately visible. This procedure is also used to install the non-
473 -- generic parent of a generic child unit when compiling its body, so that
474 -- full views of types in the parent are made visible.
476 procedure Remove_Parent
(In_Body
: Boolean := False);
477 -- Reverse effect after instantiation of child is complete.
479 procedure Inline_Instance_Body
481 Gen_Unit
: Entity_Id
;
483 -- If front-end inlining is requested, instantiate the package body,
484 -- and preserve the visibility of its compilation unit, to insure
485 -- that successive instantiations succeed.
487 -- The functions Instantiate_XXX perform various legality checks and build
488 -- the declarations for instantiated generic parameters.
489 -- Need to describe what the parameters are ???
491 function Instantiate_Object
494 Analyzed_Formal
: Node_Id
) return List_Id
;
496 function Instantiate_Type
499 Analyzed_Formal
: Node_Id
;
500 Actual_Decls
: List_Id
) return Node_Id
;
502 function Instantiate_Formal_Subprogram
505 Analyzed_Formal
: Node_Id
) return Node_Id
;
507 function Instantiate_Formal_Package
510 Analyzed_Formal
: Node_Id
) return List_Id
;
511 -- If the formal package is declared with a box, special visibility rules
512 -- apply to its formals: they are in the visible part of the package. This
513 -- is true in the declarative region of the formal package, that is to say
514 -- in the enclosing generic or instantiation. For an instantiation, the
515 -- parameters of the formal package are made visible in an explicit step.
516 -- Furthermore, if the actual is a visible use_clause, these formals must
517 -- be made potentially use_visible as well. On exit from the enclosing
518 -- instantiation, the reverse must be done.
520 -- For a formal package declared without a box, there are conformance rules
521 -- that apply to the actuals in the generic declaration and the actuals of
522 -- the actual package in the enclosing instantiation. The simplest way to
523 -- apply these rules is to repeat the instantiation of the formal package
524 -- in the context of the enclosing instance, and compare the generic
525 -- associations of this instantiation with those of the actual package.
527 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
528 -- Test if given node is in the main unit
530 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
);
531 -- If the generic appears in a separate non-generic library unit,
532 -- load the corresponding body to retrieve the body of the generic.
533 -- N is the node for the generic instantiation, Spec is the generic
534 -- package declaration.
536 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
537 -- Add the context clause of the unit containing a generic unit to
538 -- an instantiation that is a compilation unit.
540 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
541 -- In order to propagate semantic information back from the analyzed
542 -- copy to the original generic, we maintain links between selected nodes
543 -- in the generic and their corresponding copies. At the end of generic
544 -- analysis, the routine Save_Global_References traverses the generic
545 -- tree, examines the semantic information, and preserves the links to
546 -- those nodes that contain global information. At instantiation, the
547 -- information from the associated node is placed on the new copy, so
548 -- that name resolution is not repeated.
550 -- Three kinds of source nodes have associated nodes:
552 -- a) those that can reference (denote) entities, that is identifiers,
553 -- character literals, expanded_names, operator symbols, operators,
554 -- and attribute reference nodes. These nodes have an Entity field
555 -- and are the set of nodes that are in N_Has_Entity.
557 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
559 -- c) selected components (N_Selected_Component)
561 -- For the first class, the associated node preserves the entity if it is
562 -- global. If the generic contains nested instantiations, the associated
563 -- node itself has been recopied, and a chain of them must be followed.
565 -- For aggregates, the associated node allows retrieval of the type, which
566 -- may otherwise not appear in the generic. The view of this type may be
567 -- different between generic and instantiation, and the full view can be
568 -- installed before the instantiation is analyzed. For aggregates of
569 -- type extensions, the same view exchange may have to be performed for
570 -- some of the ancestor types, if their view is private at the point of
573 -- Nodes that are selected components in the parse tree may be rewritten
574 -- as expanded names after resolution, and must be treated as potential
575 -- entity holders. which is why they also have an Associated_Node.
577 -- Nodes that do not come from source, such as freeze nodes, do not appear
578 -- in the generic tree, and need not have an associated node.
580 -- The associated node is stored in the Associated_Node field. Note that
581 -- this field overlaps Entity, which is fine, because the whole point is
582 -- that we don't need or want the normal Entity field in this situation.
584 procedure Move_Freeze_Nodes
588 -- Freeze nodes can be generated in the analysis of a generic unit, but
589 -- will not be seen by the back-end. It is necessary to move those nodes
590 -- to the enclosing scope if they freeze an outer entity. We place them
591 -- at the end of the enclosing generic package, which is semantically
594 procedure Pre_Analyze_Actuals
(N
: Node_Id
);
595 -- Analyze actuals to perform name resolution. Full resolution is done
596 -- later, when the expected types are known, but names have to be captured
597 -- before installing parents of generics, that are not visible for the
598 -- actuals themselves.
600 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
601 -- Verify that an attribute that appears as the default for a formal
602 -- subprogram is a function or procedure with the correct profile.
604 -------------------------------------------
605 -- Data Structures for Generic Renamings --
606 -------------------------------------------
608 -- The map Generic_Renamings associates generic entities with their
609 -- corresponding actuals. Currently used to validate type instances.
610 -- It will eventually be used for all generic parameters to eliminate
611 -- the need for overload resolution in the instance.
613 type Assoc_Ptr
is new Int
;
615 Assoc_Null
: constant Assoc_Ptr
:= -1;
620 Next_In_HTable
: Assoc_Ptr
;
623 package Generic_Renamings
is new Table
.Table
624 (Table_Component_Type
=> Assoc
,
625 Table_Index_Type
=> Assoc_Ptr
,
626 Table_Low_Bound
=> 0,
628 Table_Increment
=> 100,
629 Table_Name
=> "Generic_Renamings");
631 -- Variable to hold enclosing instantiation. When the environment is
632 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
634 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
636 -- Hash table for associations
638 HTable_Size
: constant := 37;
639 type HTable_Range
is range 0 .. HTable_Size
- 1;
641 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
642 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
643 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
644 function Hash
(F
: Entity_Id
) return HTable_Range
;
646 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
647 Header_Num
=> HTable_Range
,
649 Elmt_Ptr
=> Assoc_Ptr
,
650 Null_Ptr
=> Assoc_Null
,
651 Set_Next
=> Set_Next_Assoc
,
654 Get_Key
=> Get_Gen_Id
,
658 Exchanged_Views
: Elist_Id
;
659 -- This list holds the private views that have been exchanged during
660 -- instantiation to restore the visibility of the generic declaration.
661 -- (see comments above). After instantiation, the current visibility is
662 -- reestablished by means of a traversal of this list.
664 Hidden_Entities
: Elist_Id
;
665 -- This list holds the entities of the current scope that are removed
666 -- from immediate visibility when instantiating a child unit. Their
667 -- visibility is restored in Remove_Parent.
669 -- Because instantiations can be recursive, the following must be saved
670 -- on entry and restored on exit from an instantiation (spec or body).
671 -- This is done by the two procedures Save_Env and Restore_Env. For
672 -- package and subprogram instantiations (but not for the body instances)
673 -- the action of Save_Env is done in two steps: Init_Env is called before
674 -- Check_Generic_Child_Unit, because setting the parent instances requires
675 -- that the visibility data structures be properly initialized. Once the
676 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
678 type Instance_Env
is record
679 Ada_Version
: Ada_Version_Type
;
680 Instantiated_Parent
: Assoc
;
681 Exchanged_Views
: Elist_Id
;
682 Hidden_Entities
: Elist_Id
;
683 Current_Sem_Unit
: Unit_Number_Type
;
686 package Instance_Envs
is new Table
.Table
(
687 Table_Component_Type
=> Instance_Env
,
688 Table_Index_Type
=> Int
,
689 Table_Low_Bound
=> 0,
691 Table_Increment
=> 100,
692 Table_Name
=> "Instance_Envs");
694 procedure Restore_Private_Views
695 (Pack_Id
: Entity_Id
;
696 Is_Package
: Boolean := True);
697 -- Restore the private views of external types, and unmark the generic
698 -- renamings of actuals, so that they become comptible subtypes again.
699 -- For subprograms, Pack_Id is the package constructed to hold the
702 procedure Switch_View
(T
: Entity_Id
);
703 -- Switch the partial and full views of a type and its private
704 -- dependents (i.e. its subtypes and derived types).
706 ------------------------------------
707 -- Structures for Error Reporting --
708 ------------------------------------
710 Instantiation_Node
: Node_Id
;
711 -- Used by subprograms that validate instantiation of formal parameters
712 -- where there might be no actual on which to place the error message.
713 -- Also used to locate the instantiation node for generic subunits.
715 Instantiation_Error
: exception;
716 -- When there is a semantic error in the generic parameter matching,
717 -- there is no point in continuing the instantiation, because the
718 -- number of cascaded errors is unpredictable. This exception aborts
719 -- the instantiation process altogether.
721 S_Adjustment
: Sloc_Adjustment
;
722 -- Offset created for each node in an instantiation, in order to keep
723 -- track of the source position of the instantiation in each of its nodes.
724 -- A subsequent semantic error or warning on a construct of the instance
725 -- points to both places: the original generic node, and the point of
726 -- instantiation. See Sinput and Sinput.L for additional details.
728 ------------------------------------------------------------
729 -- Data structure for keeping track when inside a Generic --
730 ------------------------------------------------------------
732 -- The following table is used to save values of the Inside_A_Generic
733 -- flag (see spec of Sem) when they are saved by Start_Generic.
735 package Generic_Flags
is new Table
.Table
(
736 Table_Component_Type
=> Boolean,
737 Table_Index_Type
=> Int
,
738 Table_Low_Bound
=> 0,
740 Table_Increment
=> 200,
741 Table_Name
=> "Generic_Flags");
743 ---------------------------
744 -- Abandon_Instantiation --
745 ---------------------------
747 procedure Abandon_Instantiation
(N
: Node_Id
) is
749 Error_Msg_N
("instantiation abandoned!", N
);
750 raise Instantiation_Error
;
751 end Abandon_Instantiation
;
753 --------------------------
754 -- Analyze_Associations --
755 --------------------------
757 function Analyze_Associations
760 F_Copy
: List_Id
) return List_Id
762 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
763 Assoc
: constant List_Id
:= New_List
;
764 Defaults
: constant Elist_Id
:= New_Elmt_List
;
765 Gen_Unit
: constant Entity_Id
:= Defining_Entity
(Parent
(F_Copy
));
769 Next_Formal
: Node_Id
;
770 Temp_Formal
: Node_Id
;
771 Analyzed_Formal
: Node_Id
;
774 First_Named
: Node_Id
:= Empty
;
775 Found_Assoc
: Node_Id
;
776 Is_Named_Assoc
: Boolean;
777 Num_Matched
: Int
:= 0;
778 Num_Actuals
: Int
:= 0;
780 function Matching_Actual
782 A_F
: Entity_Id
) return Node_Id
;
783 -- Find actual that corresponds to a given a formal parameter. If the
784 -- actuals are positional, return the next one, if any. If the actuals
785 -- are named, scan the parameter associations to find the right one.
786 -- A_F is the corresponding entity in the analyzed generic,which is
787 -- placed on the selector name for ASIS use.
789 procedure Set_Analyzed_Formal
;
790 -- Find the node in the generic copy that corresponds to a given formal.
791 -- The semantic information on this node is used to perform legality
792 -- checks on the actuals. Because semantic analysis can introduce some
793 -- anonymous entities or modify the declaration node itself, the
794 -- correspondence between the two lists is not one-one. In addition to
795 -- anonymous types, the presence a formal equality will introduce an
796 -- implicit declaration for the corresponding inequality.
798 ---------------------
799 -- Matching_Actual --
800 ---------------------
802 function Matching_Actual
804 A_F
: Entity_Id
) return Node_Id
810 Is_Named_Assoc
:= False;
812 -- End of list of purely positional parameters
817 -- Case of positional parameter corresponding to current formal
819 elsif No
(Selector_Name
(Actual
)) then
820 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
821 Found_Assoc
:= Actual
;
822 Num_Matched
:= Num_Matched
+ 1;
825 -- Otherwise scan list of named actuals to find the one with the
826 -- desired name. All remaining actuals have explicit names.
829 Is_Named_Assoc
:= True;
833 while Present
(Actual
) loop
834 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
835 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
836 Set_Entity
(Selector_Name
(Actual
), A_F
);
837 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
838 Generate_Reference
(A_F
, Selector_Name
(Actual
));
839 Found_Assoc
:= Actual
;
840 Num_Matched
:= Num_Matched
+ 1;
848 -- Reset for subsequent searches. In most cases the named
849 -- associations are in order. If they are not, we reorder them
850 -- to avoid scanning twice the same actual. This is not just a
851 -- question of efficiency: there may be multiple defaults with
852 -- boxes that have the same name. In a nested instantiation we
853 -- insert actuals for those defaults, and cannot rely on their
854 -- names to disambiguate them.
856 if Actual
= First_Named
then
859 elsif Present
(Actual
) then
860 Insert_Before
(First_Named
, Remove_Next
(Prev
));
863 Actual
:= First_Named
;
869 -------------------------
870 -- Set_Analyzed_Formal --
871 -------------------------
873 procedure Set_Analyzed_Formal
is
876 while Present
(Analyzed_Formal
) loop
877 Kind
:= Nkind
(Analyzed_Formal
);
879 case Nkind
(Formal
) is
881 when N_Formal_Subprogram_Declaration
=>
882 exit when Kind
= N_Formal_Subprogram_Declaration
885 (Defining_Unit_Name
(Specification
(Formal
))) =
887 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
889 when N_Formal_Package_Declaration
=>
891 Kind
= N_Formal_Package_Declaration
893 Kind
= N_Generic_Package_Declaration
;
895 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
899 -- Skip freeze nodes, and nodes inserted to replace
900 -- unrecognized pragmas.
903 Kind
/= N_Formal_Subprogram_Declaration
904 and then Kind
/= N_Subprogram_Declaration
905 and then Kind
/= N_Freeze_Entity
906 and then Kind
/= N_Null_Statement
907 and then Kind
/= N_Itype_Reference
908 and then Chars
(Defining_Identifier
(Formal
)) =
909 Chars
(Defining_Identifier
(Analyzed_Formal
));
912 Next
(Analyzed_Formal
);
915 end Set_Analyzed_Formal
;
917 -- Start of processing for Analyze_Associations
920 -- If named associations are present, save the first named association
921 -- (it may of course be Empty) to facilitate subsequent name search.
923 Actuals
:= Generic_Associations
(I_Node
);
925 if Present
(Actuals
) then
926 First_Named
:= First
(Actuals
);
928 while Present
(First_Named
)
929 and then No
(Selector_Name
(First_Named
))
931 Num_Actuals
:= Num_Actuals
+ 1;
936 Named
:= First_Named
;
937 while Present
(Named
) loop
938 if No
(Selector_Name
(Named
)) then
939 Error_Msg_N
("invalid positional actual after named one", Named
);
940 Abandon_Instantiation
(Named
);
943 -- A named association may lack an actual parameter, if it was
944 -- introduced for a default subprogram that turns out to be local
945 -- to the outer instantiation.
947 if Present
(Explicit_Generic_Actual_Parameter
(Named
)) then
948 Num_Actuals
:= Num_Actuals
+ 1;
954 if Present
(Formals
) then
955 Formal
:= First_Non_Pragma
(Formals
);
956 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
958 if Present
(Actuals
) then
959 Actual
:= First
(Actuals
);
961 -- All formals should have default values
967 while Present
(Formal
) loop
969 Next_Formal
:= Next_Non_Pragma
(Formal
);
971 case Nkind
(Formal
) is
972 when N_Formal_Object_Declaration
=>
975 Defining_Identifier
(Formal
),
976 Defining_Identifier
(Analyzed_Formal
));
979 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
982 when N_Formal_Type_Declaration
=>
985 Defining_Identifier
(Formal
),
986 Defining_Identifier
(Analyzed_Formal
));
989 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
992 Instantiation_Node
, Defining_Identifier
(Formal
));
993 Error_Msg_NE
("\in instantiation of & declared#",
994 Instantiation_Node
, Gen_Unit
);
995 Abandon_Instantiation
(Instantiation_Node
);
1001 (Formal
, Match
, Analyzed_Formal
, Assoc
));
1003 -- an instantiation is a freeze point for the actuals,
1004 -- unless this is a rewritten formal package.
1006 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1007 Append_Elmt
(Entity
(Match
), Actual_Types
);
1011 -- A remote access-to-class-wide type must not be an
1012 -- actual parameter for a generic formal of an access
1013 -- type (E.2.2 (17)).
1015 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1017 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1018 N_Access_To_Object_Definition
1020 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1023 when N_Formal_Subprogram_Declaration
=>
1026 Defining_Unit_Name
(Specification
(Formal
)),
1027 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1029 -- If the formal subprogram has the same name as
1030 -- another formal subprogram of the generic, then
1031 -- a named association is illegal (12.3(9)). Exclude
1032 -- named associations that are generated for a nested
1036 and then Is_Named_Assoc
1037 and then Comes_From_Source
(Found_Assoc
)
1039 Temp_Formal
:= First
(Formals
);
1040 while Present
(Temp_Formal
) loop
1041 if Nkind
(Temp_Formal
) =
1042 N_Formal_Subprogram_Declaration
1043 and then Temp_Formal
/= Formal
1045 Chars
(Selector_Name
(Found_Assoc
)) =
1046 Chars
(Defining_Unit_Name
1047 (Specification
(Temp_Formal
)))
1050 ("name not allowed for overloaded formal",
1052 Abandon_Instantiation
(Instantiation_Node
);
1060 Instantiate_Formal_Subprogram
1061 (Formal
, Match
, Analyzed_Formal
));
1064 and then Box_Present
(Formal
)
1067 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1071 when N_Formal_Package_Declaration
=>
1074 Defining_Identifier
(Formal
),
1075 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1078 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1081 Instantiation_Node
, Defining_Identifier
(Formal
));
1082 Error_Msg_NE
("\in instantiation of & declared#",
1083 Instantiation_Node
, Gen_Unit
);
1085 Abandon_Instantiation
(Instantiation_Node
);
1090 (Instantiate_Formal_Package
1091 (Formal
, Match
, Analyzed_Formal
),
1095 -- For use type and use package appearing in the context
1096 -- clause, we have already copied them, so we can just
1097 -- move them where they belong (we mustn't recopy them
1098 -- since this would mess up the Sloc values).
1100 when N_Use_Package_Clause |
1101 N_Use_Type_Clause
=>
1103 Append
(Formal
, Assoc
);
1106 raise Program_Error
;
1110 Formal
:= Next_Formal
;
1111 Next_Non_Pragma
(Analyzed_Formal
);
1114 if Num_Actuals
> Num_Matched
then
1115 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1117 if Present
(Selector_Name
(Actual
)) then
1119 ("unmatched actual&",
1120 Actual
, Selector_Name
(Actual
));
1121 Error_Msg_NE
("\in instantiation of& declared#",
1125 ("unmatched actual in instantiation of& declared#",
1130 elsif Present
(Actuals
) then
1132 ("too many actuals in generic instantiation", Instantiation_Node
);
1136 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1139 while Present
(Elmt
) loop
1140 Freeze_Before
(I_Node
, Node
(Elmt
));
1145 -- If there are default subprograms, normalize the tree by adding
1146 -- explicit associations for them. This is required if the instance
1147 -- appears within a generic.
1155 Elmt
:= First_Elmt
(Defaults
);
1156 while Present
(Elmt
) loop
1157 if No
(Actuals
) then
1158 Actuals
:= New_List
;
1159 Set_Generic_Associations
(I_Node
, Actuals
);
1162 Subp
:= Node
(Elmt
);
1164 Make_Generic_Association
(Sloc
(Subp
),
1165 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1166 Explicit_Generic_Actual_Parameter
=>
1167 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1168 Mark_Rewrite_Insertion
(New_D
);
1169 Append_To
(Actuals
, New_D
);
1175 end Analyze_Associations
;
1177 -------------------------------
1178 -- Analyze_Formal_Array_Type --
1179 -------------------------------
1181 procedure Analyze_Formal_Array_Type
1182 (T
: in out Entity_Id
;
1188 -- Treated like a non-generic array declaration, with
1189 -- additional semantic checks.
1193 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1194 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1195 while Present
(DSS
) loop
1196 if Nkind
(DSS
) = N_Subtype_Indication
1197 or else Nkind
(DSS
) = N_Range
1198 or else Nkind
(DSS
) = N_Attribute_Reference
1200 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1207 Array_Type_Declaration
(T
, Def
);
1208 Set_Is_Generic_Type
(Base_Type
(T
));
1210 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1211 and then No
(Full_View
(Component_Type
(T
)))
1213 Error_Msg_N
("premature usage of incomplete type", Def
);
1215 -- Check that range constraint is not allowed on the component type
1216 -- of a generic formal array type (AARM 12.5.3(3))
1218 elsif Is_Internal
(Component_Type
(T
))
1219 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1220 and then Nkind
(Original_Node
1221 (Subtype_Indication
(Component_Definition
(Def
))))
1222 = N_Subtype_Indication
1225 ("in a formal, a subtype indication can only be "
1226 & "a subtype mark ('R'M 12.5.3(3))",
1227 Subtype_Indication
(Component_Definition
(Def
)));
1230 end Analyze_Formal_Array_Type
;
1232 ---------------------------------------------
1233 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1234 ---------------------------------------------
1236 -- As for other generic types, we create a valid type representation
1237 -- with legal but arbitrary attributes, whose values are never considered
1238 -- static. For all scalar types we introduce an anonymous base type, with
1239 -- the same attributes. We choose the corresponding integer type to be
1240 -- Standard_Integer.
1242 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1246 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1247 Base
: constant Entity_Id
:=
1249 (E_Decimal_Fixed_Point_Type
,
1250 Current_Scope
, Sloc
(Def
), 'G');
1251 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1252 Delta_Val
: constant Ureal
:= Ureal_1
;
1253 Digs_Val
: constant Uint
:= Uint_6
;
1258 Set_Etype
(Base
, Base
);
1259 Set_Size_Info
(Base
, Int_Base
);
1260 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1261 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1262 Set_Digits_Value
(Base
, Digs_Val
);
1263 Set_Delta_Value
(Base
, Delta_Val
);
1264 Set_Small_Value
(Base
, Delta_Val
);
1265 Set_Scalar_Range
(Base
,
1267 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1268 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1270 Set_Is_Generic_Type
(Base
);
1271 Set_Parent
(Base
, Parent
(Def
));
1273 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1274 Set_Etype
(T
, Base
);
1275 Set_Size_Info
(T
, Int_Base
);
1276 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1277 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1278 Set_Digits_Value
(T
, Digs_Val
);
1279 Set_Delta_Value
(T
, Delta_Val
);
1280 Set_Small_Value
(T
, Delta_Val
);
1281 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1283 Check_Restriction
(No_Fixed_Point
, Def
);
1284 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1286 ---------------------------------
1287 -- Analyze_Formal_Derived_Type --
1288 ---------------------------------
1290 procedure Analyze_Formal_Derived_Type
1295 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1296 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1300 Set_Is_Generic_Type
(T
);
1302 if Private_Present
(Def
) then
1304 Make_Private_Extension_Declaration
(Loc
,
1305 Defining_Identifier
=> T
,
1306 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1307 Unknown_Discriminants_Present
=> Unk_Disc
,
1308 Subtype_Indication
=> Subtype_Mark
(Def
));
1310 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1314 Make_Full_Type_Declaration
(Loc
,
1315 Defining_Identifier
=> T
,
1316 Discriminant_Specifications
=>
1317 Discriminant_Specifications
(Parent
(T
)),
1319 Make_Derived_Type_Definition
(Loc
,
1320 Subtype_Indication
=> Subtype_Mark
(Def
)));
1322 Set_Abstract_Present
1323 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1330 if not Is_Composite_Type
(T
) then
1332 ("unknown discriminants not allowed for elementary types", N
);
1334 Set_Has_Unknown_Discriminants
(T
);
1335 Set_Is_Constrained
(T
, False);
1339 -- If the parent type has a known size, so does the formal, which
1340 -- makes legal representation clauses that involve the formal.
1342 Set_Size_Known_At_Compile_Time
1343 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1345 end Analyze_Formal_Derived_Type
;
1347 ----------------------------------
1348 -- Analyze_Formal_Discrete_Type --
1349 ----------------------------------
1351 -- The operations defined for a discrete types are those of an
1352 -- enumeration type. The size is set to an arbitrary value, for use
1353 -- in analyzing the generic unit.
1355 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1356 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1362 Set_Ekind
(T
, E_Enumeration_Type
);
1367 -- For semantic analysis, the bounds of the type must be set to some
1368 -- non-static value. The simplest is to create attribute nodes for
1369 -- those bounds, that refer to the type itself. These bounds are never
1370 -- analyzed but serve as place-holders.
1373 Make_Attribute_Reference
(Loc
,
1374 Attribute_Name
=> Name_First
,
1375 Prefix
=> New_Reference_To
(T
, Loc
));
1379 Make_Attribute_Reference
(Loc
,
1380 Attribute_Name
=> Name_Last
,
1381 Prefix
=> New_Reference_To
(T
, Loc
));
1384 Set_Scalar_Range
(T
,
1389 end Analyze_Formal_Discrete_Type
;
1391 ----------------------------------
1392 -- Analyze_Formal_Floating_Type --
1393 ---------------------------------
1395 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1396 Base
: constant Entity_Id
:=
1398 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1401 -- The various semantic attributes are taken from the predefined type
1402 -- Float, just so that all of them are initialized. Their values are
1403 -- never used because no constant folding or expansion takes place in
1404 -- the generic itself.
1407 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1408 Set_Etype
(T
, Base
);
1409 Set_Size_Info
(T
, (Standard_Float
));
1410 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1411 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1412 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1414 Set_Is_Generic_Type
(Base
);
1415 Set_Etype
(Base
, Base
);
1416 Set_Size_Info
(Base
, (Standard_Float
));
1417 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1418 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1419 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1420 Set_Parent
(Base
, Parent
(Def
));
1422 Check_Restriction
(No_Floating_Point
, Def
);
1423 end Analyze_Formal_Floating_Type
;
1425 ---------------------------------
1426 -- Analyze_Formal_Modular_Type --
1427 ---------------------------------
1429 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1431 -- Apart from their entity kind, generic modular types are treated
1432 -- like signed integer types, and have the same attributes.
1434 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1435 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1436 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1438 end Analyze_Formal_Modular_Type
;
1440 ---------------------------------------
1441 -- Analyze_Formal_Object_Declaration --
1442 ---------------------------------------
1444 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1445 E
: constant Node_Id
:= Expression
(N
);
1446 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1453 -- Determine the mode of the formal object
1455 if Out_Present
(N
) then
1456 K
:= E_Generic_In_Out_Parameter
;
1458 if not In_Present
(N
) then
1459 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1463 K
:= E_Generic_In_Parameter
;
1466 Find_Type
(Subtype_Mark
(N
));
1467 T
:= Entity
(Subtype_Mark
(N
));
1469 if Ekind
(T
) = E_Incomplete_Type
then
1470 Error_Msg_N
("premature usage of incomplete type", Subtype_Mark
(N
));
1473 if K
= E_Generic_In_Parameter
then
1475 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1477 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1479 ("generic formal of mode IN must not be of limited type", N
);
1480 Explain_Limited_Type
(T
, N
);
1483 if Is_Abstract
(T
) then
1485 ("generic formal of mode IN must not be of abstract type", N
);
1489 Analyze_Per_Use_Expression
(E
, T
);
1495 -- Case of generic IN OUT parameter.
1498 -- If the formal has an unconstrained type, construct its
1499 -- actual subtype, as is done for subprogram formals. In this
1500 -- fashion, all its uses can refer to specific bounds.
1505 if (Is_Array_Type
(T
)
1506 and then not Is_Constrained
(T
))
1508 (Ekind
(T
) = E_Record_Type
1509 and then Has_Discriminants
(T
))
1512 Non_Freezing_Ref
: constant Node_Id
:=
1513 New_Reference_To
(Id
, Sloc
(Id
));
1517 -- Make sure that the actual subtype doesn't generate
1520 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1521 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1522 Insert_Before_And_Analyze
(N
, Decl
);
1523 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1526 Set_Actual_Subtype
(Id
, T
);
1531 ("initialization not allowed for `IN OUT` formals", N
);
1535 end Analyze_Formal_Object_Declaration
;
1537 ----------------------------------------------
1538 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1539 ----------------------------------------------
1541 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1545 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1546 Base
: constant Entity_Id
:=
1548 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1550 -- The semantic attributes are set for completeness only, their
1551 -- values will never be used, because all properties of the type
1555 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1556 Set_Etype
(T
, Base
);
1557 Set_Size_Info
(T
, Standard_Integer
);
1558 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1559 Set_Small_Value
(T
, Ureal_1
);
1560 Set_Delta_Value
(T
, Ureal_1
);
1561 Set_Scalar_Range
(T
,
1563 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1564 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1566 Set_Is_Generic_Type
(Base
);
1567 Set_Etype
(Base
, Base
);
1568 Set_Size_Info
(Base
, Standard_Integer
);
1569 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1570 Set_Small_Value
(Base
, Ureal_1
);
1571 Set_Delta_Value
(Base
, Ureal_1
);
1572 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1573 Set_Parent
(Base
, Parent
(Def
));
1575 Check_Restriction
(No_Fixed_Point
, Def
);
1576 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1578 ----------------------------
1579 -- Analyze_Formal_Package --
1580 ----------------------------
1582 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1583 Loc
: constant Source_Ptr
:= Sloc
(N
);
1584 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1586 Gen_Id
: constant Node_Id
:= Name
(N
);
1588 Gen_Unit
: Entity_Id
;
1590 Parent_Installed
: Boolean := False;
1592 Parent_Instance
: Entity_Id
;
1593 Renaming_In_Par
: Entity_Id
;
1596 Text_IO_Kludge
(Gen_Id
);
1599 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
1600 Gen_Unit
:= Entity
(Gen_Id
);
1602 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
1603 Error_Msg_N
("expect generic package name", Gen_Id
);
1607 elsif Gen_Unit
= Current_Scope
then
1609 ("generic package cannot be used as a formal package of itself",
1614 elsif In_Open_Scopes
(Gen_Unit
) then
1615 if Is_Compilation_Unit
(Gen_Unit
)
1616 and then Is_Child_Unit
(Current_Scope
)
1618 -- Special-case the error when the formal is a parent, and
1619 -- continue analysis to minimize cascaded errors.
1622 ("generic parent cannot be used as formal package "
1623 & "of a child unit",
1628 ("generic package cannot be used as a formal package "
1636 -- Check for a formal package that is a package renaming.
1638 if Present
(Renamed_Object
(Gen_Unit
)) then
1639 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
1642 -- The formal package is treated like a regular instance, but only
1643 -- the specification needs to be instantiated, to make entities visible.
1645 if not Box_Present
(N
) then
1646 Hidden_Entities
:= New_Elmt_List
;
1647 Analyze_Package_Instantiation
(N
);
1649 if Parent_Installed
then
1654 -- If there are no generic associations, the generic parameters
1655 -- appear as local entities and are instantiated like them. We copy
1656 -- the generic package declaration as if it were an instantiation,
1657 -- and analyze it like a regular package, except that we treat the
1658 -- formals as additional visible components.
1660 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
1662 if In_Extended_Main_Source_Unit
(N
) then
1663 Set_Is_Instantiated
(Gen_Unit
);
1664 Generate_Reference
(Gen_Unit
, N
);
1667 Formal
:= New_Copy
(Pack_Id
);
1670 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
1672 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
1673 Set_Instance_Env
(Gen_Unit
, Formal
);
1675 Enter_Name
(Formal
);
1676 Set_Ekind
(Formal
, E_Generic_Package
);
1677 Set_Etype
(Formal
, Standard_Void_Type
);
1678 Set_Inner_Instances
(Formal
, New_Elmt_List
);
1681 -- Within the formal, the name of the generic package is a renaming
1682 -- of the formal (as for a regular instantiation).
1684 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1685 Defining_Unit_Name
=>
1686 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1687 Name
=> New_Reference_To
(Formal
, Loc
));
1689 if Present
(Visible_Declarations
(Specification
(N
))) then
1690 Prepend
(Renaming
, To
=> Visible_Declarations
(Specification
(N
)));
1691 elsif Present
(Private_Declarations
(Specification
(N
))) then
1692 Prepend
(Renaming
, To
=> Private_Declarations
(Specification
(N
)));
1695 if Is_Child_Unit
(Gen_Unit
)
1696 and then Parent_Installed
1698 -- Similarly, we have to make the name of the formal visible in
1699 -- the parent instance, to resolve properly fully qualified names
1700 -- that may appear in the generic unit. The parent instance has
1701 -- been placed on the scope stack ahead of the current scope.
1703 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
1706 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
1707 Set_Ekind
(Renaming_In_Par
, E_Package
);
1708 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
1709 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
1710 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
1711 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
1712 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
1715 Analyze_Generic_Formal_Part
(N
);
1716 Analyze
(Specification
(N
));
1717 End_Package_Scope
(Formal
);
1719 if Parent_Installed
then
1725 -- Inside the generic unit, the formal package is a regular
1726 -- package, but no body is needed for it. Note that after
1727 -- instantiation, the defining_unit_name we need is in the
1728 -- new tree and not in the original. (see Package_Instantiation).
1729 -- A generic formal package is an instance, and can be used as
1730 -- an actual for an inner instance. Mark its generic parent.
1732 Set_Ekind
(Formal
, E_Package
);
1733 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
1734 Set_Has_Completion
(Formal
, True);
1736 Set_Ekind
(Pack_Id
, E_Package
);
1737 Set_Etype
(Pack_Id
, Standard_Void_Type
);
1738 Set_Scope
(Pack_Id
, Scope
(Formal
));
1739 Set_Has_Completion
(Pack_Id
, True);
1741 end Analyze_Formal_Package
;
1743 ---------------------------------
1744 -- Analyze_Formal_Private_Type --
1745 ---------------------------------
1747 procedure Analyze_Formal_Private_Type
1753 New_Private_Type
(N
, T
, Def
);
1755 -- Set the size to an arbitrary but legal value.
1757 Set_Size_Info
(T
, Standard_Integer
);
1758 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1759 end Analyze_Formal_Private_Type
;
1761 ----------------------------------------
1762 -- Analyze_Formal_Signed_Integer_Type --
1763 ----------------------------------------
1765 procedure Analyze_Formal_Signed_Integer_Type
1769 Base
: constant Entity_Id
:=
1771 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
1776 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
1777 Set_Etype
(T
, Base
);
1778 Set_Size_Info
(T
, Standard_Integer
);
1779 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1780 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
1782 Set_Is_Generic_Type
(Base
);
1783 Set_Size_Info
(Base
, Standard_Integer
);
1784 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1785 Set_Etype
(Base
, Base
);
1786 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
1787 Set_Parent
(Base
, Parent
(Def
));
1788 end Analyze_Formal_Signed_Integer_Type
;
1790 -------------------------------
1791 -- Analyze_Formal_Subprogram --
1792 -------------------------------
1794 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
1795 Spec
: constant Node_Id
:= Specification
(N
);
1796 Def
: constant Node_Id
:= Default_Name
(N
);
1797 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
1805 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
1806 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
1810 Analyze_Subprogram_Declaration
(N
);
1811 Set_Is_Formal_Subprogram
(Nam
);
1812 Set_Has_Completion
(Nam
);
1814 -- Default name is resolved at the point of instantiation
1816 if Box_Present
(N
) then
1819 -- Else default is bound at the point of generic declaration
1821 elsif Present
(Def
) then
1822 if Nkind
(Def
) = N_Operator_Symbol
then
1823 Find_Direct_Name
(Def
);
1825 elsif Nkind
(Def
) /= N_Attribute_Reference
then
1829 -- For an attribute reference, analyze the prefix and verify
1830 -- that it has the proper profile for the subprogram.
1832 Analyze
(Prefix
(Def
));
1833 Valid_Default_Attribute
(Nam
, Def
);
1837 -- Default name may be overloaded, in which case the interpretation
1838 -- with the correct profile must be selected, as for a renaming.
1840 if Etype
(Def
) = Any_Type
then
1843 elsif Nkind
(Def
) = N_Selected_Component
then
1844 Subp
:= Entity
(Selector_Name
(Def
));
1846 if Ekind
(Subp
) /= E_Entry
then
1847 Error_Msg_N
("expect valid subprogram name as default", Def
);
1851 elsif Nkind
(Def
) = N_Indexed_Component
then
1853 if Nkind
(Prefix
(Def
)) /= N_Selected_Component
then
1854 Error_Msg_N
("expect valid subprogram name as default", Def
);
1858 Subp
:= Entity
(Selector_Name
(Prefix
(Def
)));
1860 if Ekind
(Subp
) /= E_Entry_Family
then
1861 Error_Msg_N
("expect valid subprogram name as default", Def
);
1866 elsif Nkind
(Def
) = N_Character_Literal
then
1868 -- Needs some type checks: subprogram should be parameterless???
1870 Resolve
(Def
, (Etype
(Nam
)));
1872 elsif not Is_Entity_Name
(Def
)
1873 or else not Is_Overloadable
(Entity
(Def
))
1875 Error_Msg_N
("expect valid subprogram name as default", Def
);
1878 elsif not Is_Overloaded
(Def
) then
1879 Subp
:= Entity
(Def
);
1882 Error_Msg_N
("premature usage of formal subprogram", Def
);
1884 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
1885 Error_Msg_N
("no visible entity matches specification", Def
);
1891 I1
: Interp_Index
:= 0;
1897 Get_First_Interp
(Def
, I
, It
);
1898 while Present
(It
.Nam
) loop
1900 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
1901 if Subp
/= Any_Id
then
1902 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
1904 if It1
= No_Interp
then
1905 Error_Msg_N
("ambiguous default subprogram", Def
);
1918 Get_Next_Interp
(I
, It
);
1922 if Subp
/= Any_Id
then
1923 Set_Entity
(Def
, Subp
);
1926 Error_Msg_N
("premature usage of formal subprogram", Def
);
1928 elsif Ekind
(Subp
) /= E_Operator
then
1929 Check_Mode_Conformant
(Subp
, Nam
);
1933 Error_Msg_N
("no visible subprogram matches specification", N
);
1937 end Analyze_Formal_Subprogram
;
1939 -------------------------------------
1940 -- Analyze_Formal_Type_Declaration --
1941 -------------------------------------
1943 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
1944 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
1948 T
:= Defining_Identifier
(N
);
1950 if Present
(Discriminant_Specifications
(N
))
1951 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
1954 ("discriminants not allowed for this formal type",
1955 Defining_Identifier
(First
(Discriminant_Specifications
(N
))));
1958 -- Enter the new name, and branch to specific routine.
1961 when N_Formal_Private_Type_Definition
=>
1962 Analyze_Formal_Private_Type
(N
, T
, Def
);
1964 when N_Formal_Derived_Type_Definition
=>
1965 Analyze_Formal_Derived_Type
(N
, T
, Def
);
1967 when N_Formal_Discrete_Type_Definition
=>
1968 Analyze_Formal_Discrete_Type
(T
, Def
);
1970 when N_Formal_Signed_Integer_Type_Definition
=>
1971 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1973 when N_Formal_Modular_Type_Definition
=>
1974 Analyze_Formal_Modular_Type
(T
, Def
);
1976 when N_Formal_Floating_Point_Definition
=>
1977 Analyze_Formal_Floating_Type
(T
, Def
);
1979 when N_Formal_Ordinary_Fixed_Point_Definition
=>
1980 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
1982 when N_Formal_Decimal_Fixed_Point_Definition
=>
1983 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
1985 when N_Array_Type_Definition
=>
1986 Analyze_Formal_Array_Type
(T
, Def
);
1988 when N_Access_To_Object_Definition |
1989 N_Access_Function_Definition |
1990 N_Access_Procedure_Definition
=>
1991 Analyze_Generic_Access_Type
(T
, Def
);
1997 raise Program_Error
;
2001 Set_Is_Generic_Type
(T
);
2002 end Analyze_Formal_Type_Declaration
;
2004 ------------------------------------
2005 -- Analyze_Function_Instantiation --
2006 ------------------------------------
2008 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2010 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2011 end Analyze_Function_Instantiation
;
2013 ---------------------------------
2014 -- Analyze_Generic_Access_Type --
2015 ---------------------------------
2017 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2021 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2022 Access_Type_Declaration
(T
, Def
);
2024 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2025 and then No
(Full_View
(Designated_Type
(T
)))
2026 and then not Is_Generic_Type
(Designated_Type
(T
))
2028 Error_Msg_N
("premature usage of incomplete type", Def
);
2030 elsif Is_Internal
(Designated_Type
(T
)) then
2032 ("only a subtype mark is allowed in a formal", Def
);
2036 Access_Subprogram_Declaration
(T
, Def
);
2038 end Analyze_Generic_Access_Type
;
2040 ---------------------------------
2041 -- Analyze_Generic_Formal_Part --
2042 ---------------------------------
2044 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2045 Gen_Parm_Decl
: Node_Id
;
2048 -- The generic formals are processed in the scope of the generic
2049 -- unit, where they are immediately visible. The scope is installed
2052 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2054 while Present
(Gen_Parm_Decl
) loop
2055 Analyze
(Gen_Parm_Decl
);
2056 Next
(Gen_Parm_Decl
);
2059 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2060 end Analyze_Generic_Formal_Part
;
2062 ------------------------------------------
2063 -- Analyze_Generic_Package_Declaration --
2064 ------------------------------------------
2066 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2067 Loc
: constant Source_Ptr
:= Sloc
(N
);
2070 Save_Parent
: Node_Id
;
2072 Decls
: constant List_Id
:=
2073 Visible_Declarations
(Specification
(N
));
2077 -- We introduce a renaming of the enclosing package, to have a usable
2078 -- entity as the prefix of an expanded name for a local entity of the
2079 -- form Par.P.Q, where P is the generic package. This is because a local
2080 -- entity named P may hide it, so that the usual visibility rules in
2081 -- the instance will not resolve properly.
2084 Make_Package_Renaming_Declaration
(Loc
,
2085 Defining_Unit_Name
=>
2086 Make_Defining_Identifier
(Loc
,
2087 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2088 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2090 if Present
(Decls
) then
2091 Decl
:= First
(Decls
);
2092 while Present
(Decl
)
2093 and then Nkind
(Decl
) = N_Pragma
2098 if Present
(Decl
) then
2099 Insert_Before
(Decl
, Renaming
);
2101 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2105 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2108 -- Create copy of generic unit, and save for instantiation.
2109 -- If the unit is a child unit, do not copy the specifications
2110 -- for the parent, which are not part of the generic tree.
2112 Save_Parent
:= Parent_Spec
(N
);
2113 Set_Parent_Spec
(N
, Empty
);
2115 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2116 Set_Parent_Spec
(New_N
, Save_Parent
);
2118 Id
:= Defining_Entity
(N
);
2119 Generate_Definition
(Id
);
2121 -- Expansion is not applied to generic units.
2126 Set_Ekind
(Id
, E_Generic_Package
);
2127 Set_Etype
(Id
, Standard_Void_Type
);
2129 Enter_Generic_Scope
(Id
);
2130 Set_Inner_Instances
(Id
, New_Elmt_List
);
2132 Set_Categorization_From_Pragmas
(N
);
2133 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2135 -- Link the declaration of the generic homonym in the generic copy
2136 -- to the package it renames, so that it is always resolved properly.
2138 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2139 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2141 -- For a library unit, we have reconstructed the entity for the
2142 -- unit, and must reset it in the library tables.
2144 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2145 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2148 Analyze_Generic_Formal_Part
(N
);
2150 -- After processing the generic formals, analysis proceeds
2151 -- as for a non-generic package.
2153 Analyze
(Specification
(N
));
2155 Validate_Categorization_Dependency
(N
, Id
);
2159 End_Package_Scope
(Id
);
2160 Exit_Generic_Scope
(Id
);
2162 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2163 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2164 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2165 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2168 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2169 Validate_RT_RAT_Component
(N
);
2171 -- If this is a spec without a body, check that generic parameters
2174 if not Body_Required
(Parent
(N
)) then
2175 Check_References
(Id
);
2178 end Analyze_Generic_Package_Declaration
;
2180 --------------------------------------------
2181 -- Analyze_Generic_Subprogram_Declaration --
2182 --------------------------------------------
2184 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2189 Save_Parent
: Node_Id
;
2192 -- Create copy of generic unit,and save for instantiation.
2193 -- If the unit is a child unit, do not copy the specifications
2194 -- for the parent, which are not part of the generic tree.
2196 Save_Parent
:= Parent_Spec
(N
);
2197 Set_Parent_Spec
(N
, Empty
);
2199 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2200 Set_Parent_Spec
(New_N
, Save_Parent
);
2203 Spec
:= Specification
(N
);
2204 Id
:= Defining_Entity
(Spec
);
2205 Generate_Definition
(Id
);
2207 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2209 ("operator symbol not allowed for generic subprogram", Id
);
2216 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2218 Enter_Generic_Scope
(Id
);
2219 Set_Inner_Instances
(Id
, New_Elmt_List
);
2220 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2222 Analyze_Generic_Formal_Part
(N
);
2224 Formals
:= Parameter_Specifications
(Spec
);
2226 if Present
(Formals
) then
2227 Process_Formals
(Formals
, Spec
);
2230 if Nkind
(Spec
) = N_Function_Specification
then
2231 Set_Ekind
(Id
, E_Generic_Function
);
2232 Find_Type
(Subtype_Mark
(Spec
));
2233 Set_Etype
(Id
, Entity
(Subtype_Mark
(Spec
)));
2235 Set_Ekind
(Id
, E_Generic_Procedure
);
2236 Set_Etype
(Id
, Standard_Void_Type
);
2239 -- For a library unit, we have reconstructed the entity for the
2240 -- unit, and must reset it in the library tables. We also need
2241 -- to make sure that Body_Required is set properly in the original
2242 -- compilation unit node.
2244 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2245 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2246 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2249 Set_Categorization_From_Pragmas
(N
);
2250 Validate_Categorization_Dependency
(N
, Id
);
2252 Save_Global_References
(Original_Node
(N
));
2256 Exit_Generic_Scope
(Id
);
2257 Generate_Reference_To_Formals
(Id
);
2258 end Analyze_Generic_Subprogram_Declaration
;
2260 -----------------------------------
2261 -- Analyze_Package_Instantiation --
2262 -----------------------------------
2264 -- Note: this procedure is also used for formal package declarations,
2265 -- in which case the argument N is an N_Formal_Package_Declaration
2266 -- node. This should really be noted in the spec! ???
2268 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2269 Loc
: constant Source_Ptr
:= Sloc
(N
);
2270 Gen_Id
: constant Node_Id
:= Name
(N
);
2273 Act_Decl_Name
: Node_Id
;
2274 Act_Decl_Id
: Entity_Id
;
2279 Gen_Unit
: Entity_Id
;
2281 Is_Actual_Pack
: constant Boolean :=
2282 Is_Internal
(Defining_Entity
(N
));
2284 Parent_Installed
: Boolean := False;
2285 Renaming_List
: List_Id
;
2286 Unit_Renaming
: Node_Id
;
2287 Needs_Body
: Boolean;
2288 Inline_Now
: Boolean := False;
2290 procedure Delay_Descriptors
(E
: Entity_Id
);
2291 -- Delay generation of subprogram descriptors for given entity
2293 function Might_Inline_Subp
return Boolean;
2294 -- If inlining is active and the generic contains inlined subprograms,
2295 -- we instantiate the body. This may cause superfluous instantiations,
2296 -- but it is simpler than detecting the need for the body at the point
2297 -- of inlining, when the context of the instance is not available.
2299 -----------------------
2300 -- Delay_Descriptors --
2301 -----------------------
2303 procedure Delay_Descriptors
(E
: Entity_Id
) is
2305 if not Delay_Subprogram_Descriptors
(E
) then
2306 Set_Delay_Subprogram_Descriptors
(E
);
2307 Pending_Descriptor
.Increment_Last
;
2308 Pending_Descriptor
.Table
(Pending_Descriptor
.Last
) := E
;
2310 end Delay_Descriptors
;
2312 -----------------------
2313 -- Might_Inline_Subp --
2314 -----------------------
2316 function Might_Inline_Subp
return Boolean is
2320 if not Inline_Processing_Required
then
2324 E
:= First_Entity
(Gen_Unit
);
2325 while Present
(E
) loop
2326 if Is_Subprogram
(E
)
2327 and then Is_Inlined
(E
)
2337 end Might_Inline_Subp
;
2339 -- Start of processing for Analyze_Package_Instantiation
2342 -- Very first thing: apply the special kludge for Text_IO processing
2343 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2345 Text_IO_Kludge
(Name
(N
));
2347 -- Make node global for error reporting.
2349 Instantiation_Node
:= N
;
2351 -- Case of instantiation of a generic package
2353 if Nkind
(N
) = N_Package_Instantiation
then
2354 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2355 Set_Comes_From_Source
(Act_Decl_Id
, True);
2357 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2359 Make_Defining_Program_Unit_Name
(Loc
,
2360 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2361 Defining_Identifier
=> Act_Decl_Id
);
2363 Act_Decl_Name
:= Act_Decl_Id
;
2366 -- Case of instantiation of a formal package
2369 Act_Decl_Id
:= Defining_Identifier
(N
);
2370 Act_Decl_Name
:= Act_Decl_Id
;
2373 Generate_Definition
(Act_Decl_Id
);
2374 Pre_Analyze_Actuals
(N
);
2377 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2378 Gen_Unit
:= Entity
(Gen_Id
);
2380 -- Verify that it is the name of a generic package
2382 if Etype
(Gen_Unit
) = Any_Type
then
2386 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2388 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2390 if From_With_Type
(Gen_Unit
) then
2392 ("cannot instantiate a limited withed package", Gen_Id
);
2395 ("expect name of generic package in instantiation", Gen_Id
);
2402 if In_Extended_Main_Source_Unit
(N
) then
2403 Set_Is_Instantiated
(Gen_Unit
);
2404 Generate_Reference
(Gen_Unit
, N
);
2406 if Present
(Renamed_Object
(Gen_Unit
)) then
2407 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2408 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2412 if Nkind
(Gen_Id
) = N_Identifier
2413 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2416 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2418 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2419 and then Is_Child_Unit
(Gen_Unit
)
2420 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2421 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2424 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2427 Set_Entity
(Gen_Id
, Gen_Unit
);
2429 -- If generic is a renaming, get original generic unit.
2431 if Present
(Renamed_Object
(Gen_Unit
))
2432 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2434 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2437 -- Verify that there are no circular instantiations.
2439 if In_Open_Scopes
(Gen_Unit
) then
2440 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2444 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2445 Error_Msg_Node_2
:= Current_Scope
;
2447 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2448 Circularity_Detected
:= True;
2453 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
2454 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2456 -- Initialize renamings map, for error checking, and the list
2457 -- that holds private entities whose views have changed between
2458 -- generic definition and instantiation. If this is the instance
2459 -- created to validate an actual package, the instantiation
2460 -- environment is that of the enclosing instance.
2462 Generic_Renamings
.Set_Last
(0);
2463 Generic_Renamings_HTable
.Reset
;
2465 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2467 -- Copy original generic tree, to produce text for instantiation.
2471 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
2473 Act_Spec
:= Specification
(Act_Tree
);
2475 -- If this is the instance created to validate an actual package,
2476 -- only the formals matter, do not examine the package spec itself.
2478 if Is_Actual_Pack
then
2479 Set_Visible_Declarations
(Act_Spec
, New_List
);
2480 Set_Private_Declarations
(Act_Spec
, New_List
);
2484 Analyze_Associations
2486 Generic_Formal_Declarations
(Act_Tree
),
2487 Generic_Formal_Declarations
(Gen_Decl
));
2489 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
2490 Set_Is_Generic_Instance
(Act_Decl_Id
);
2492 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
2494 -- References to the generic in its own declaration or its body
2495 -- are references to the instance. Add a renaming declaration for
2496 -- the generic unit itself. This declaration, as well as the renaming
2497 -- declarations for the generic formals, must remain private to the
2498 -- unit: the formals, because this is the language semantics, and
2499 -- the unit because its use is an artifact of the implementation.
2502 Make_Package_Renaming_Declaration
(Loc
,
2503 Defining_Unit_Name
=>
2504 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2505 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
2507 Append
(Unit_Renaming
, Renaming_List
);
2509 -- The renaming declarations are the first local declarations of
2512 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
2514 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
2516 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
2520 Make_Package_Declaration
(Loc
,
2521 Specification
=> Act_Spec
);
2523 -- Save the instantiation node, for subsequent instantiation
2524 -- of the body, if there is one and we are generating code for
2525 -- the current unit. Mark the unit as having a body, to avoid
2526 -- a premature error message.
2528 -- We instantiate the body if we are generating code, if we are
2529 -- generating cross-reference information, or if we are building
2530 -- trees for ASIS use.
2533 Enclosing_Body_Present
: Boolean := False;
2534 -- If the generic unit is not a compilation unit, then a body
2535 -- may be present in its parent even if none is required. We
2536 -- create a tentative pending instantiation for the body, which
2537 -- will be discarded if none is actually present.
2542 if Scope
(Gen_Unit
) /= Standard_Standard
2543 and then not Is_Child_Unit
(Gen_Unit
)
2545 Scop
:= Scope
(Gen_Unit
);
2547 while Present
(Scop
)
2548 and then Scop
/= Standard_Standard
2550 if Unit_Requires_Body
(Scop
) then
2551 Enclosing_Body_Present
:= True;
2554 elsif In_Open_Scopes
(Scop
)
2555 and then In_Package_Body
(Scop
)
2557 Enclosing_Body_Present
:= True;
2561 exit when Is_Compilation_Unit
(Scop
);
2562 Scop
:= Scope
(Scop
);
2566 -- If front-end inlining is enabled, and this is a unit for which
2567 -- code will be generated, we instantiate the body at once.
2568 -- This is done if the instance is not the main unit, and if the
2569 -- generic is not a child unit of another generic, to avoid scope
2570 -- problems and the reinstallation of parent instances.
2572 if Front_End_Inlining
2573 and then Expander_Active
2574 and then (not Is_Child_Unit
(Gen_Unit
)
2575 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
2576 and then (Is_In_Main_Unit
(N
)
2577 or else In_Main_Context
(Current_Scope
))
2578 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2579 and then Might_Inline_Subp
2580 and then not Is_Actual_Pack
2586 (Unit_Requires_Body
(Gen_Unit
)
2587 or else Enclosing_Body_Present
2588 or else Present
(Corresponding_Body
(Gen_Decl
)))
2589 and then (Is_In_Main_Unit
(N
)
2590 or else Might_Inline_Subp
)
2591 and then not Is_Actual_Pack
2592 and then not Inline_Now
2594 and then (Operating_Mode
= Generate_Code
2595 or else (Operating_Mode
= Check_Semantics
2596 and then ASIS_Mode
));
2598 -- If front_end_inlining is enabled, do not instantiate a
2599 -- body if within a generic context.
2601 if (Front_End_Inlining
2602 and then not Expander_Active
)
2603 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
2605 Needs_Body
:= False;
2608 -- If the current context is generic, and the package being
2609 -- instantiated is declared within a formal package, there
2610 -- is no body to instantiate until the enclosing generic is
2611 -- instantiated, and there is an actual for the formal
2612 -- package. If the formal package has parameters, we build a
2613 -- regular package instance for it, that preceeds the original
2614 -- formal package declaration.
2616 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
2618 Decl
: constant Node_Id
:=
2620 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
2622 if Nkind
(Decl
) = N_Formal_Package_Declaration
2623 or else (Nkind
(Decl
) = N_Package_Declaration
2624 and then Is_List_Member
(Decl
)
2625 and then Present
(Next
(Decl
))
2627 Nkind
(Next
(Decl
)) = N_Formal_Package_Declaration
)
2629 Needs_Body
:= False;
2635 -- If we are generating the calling stubs from the instantiation
2636 -- of a generic RCI package, we will not use the body of the
2639 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
2640 and then Is_Compilation_Unit
(Defining_Entity
(N
))
2642 Needs_Body
:= False;
2647 -- Here is a defence against a ludicrous number of instantiations
2648 -- caused by a circular set of instantiation attempts.
2650 if Pending_Instantiations
.Last
>
2651 Hostparm
.Max_Instantiations
2653 Error_Msg_N
("too many instantiations", N
);
2654 raise Unrecoverable_Error
;
2657 -- Indicate that the enclosing scopes contain an instantiation,
2658 -- and that cleanup actions should be delayed until after the
2659 -- instance body is expanded.
2661 Check_Forward_Instantiation
(Gen_Decl
);
2662 if Nkind
(N
) = N_Package_Instantiation
then
2664 Enclosing_Master
: Entity_Id
:= Current_Scope
;
2667 while Enclosing_Master
/= Standard_Standard
loop
2669 if Ekind
(Enclosing_Master
) = E_Package
then
2670 if Is_Compilation_Unit
(Enclosing_Master
) then
2671 if In_Package_Body
(Enclosing_Master
) then
2673 (Body_Entity
(Enclosing_Master
));
2682 Enclosing_Master
:= Scope
(Enclosing_Master
);
2685 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
2686 Enclosing_Master
:= Scope
(Enclosing_Master
);
2688 elsif Is_Generic_Subprogram
(Enclosing_Master
)
2689 or else Ekind
(Enclosing_Master
) = E_Void
2691 -- Cleanup actions will eventually be performed on
2692 -- the enclosing instance, if any. enclosing scope
2693 -- is void in the formal part of a generic subp.
2698 if Ekind
(Enclosing_Master
) = E_Entry
2700 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
2703 Protected_Body_Subprogram
(Enclosing_Master
);
2706 Set_Delay_Cleanups
(Enclosing_Master
);
2708 while Ekind
(Enclosing_Master
) = E_Block
loop
2709 Enclosing_Master
:= Scope
(Enclosing_Master
);
2712 if Is_Subprogram
(Enclosing_Master
) then
2713 Delay_Descriptors
(Enclosing_Master
);
2715 elsif Is_Task_Type
(Enclosing_Master
) then
2717 TBP
: constant Node_Id
:=
2718 Get_Task_Body_Procedure
2722 if Present
(TBP
) then
2723 Delay_Descriptors
(TBP
);
2724 Set_Delay_Cleanups
(TBP
);
2734 -- Make entry in table
2736 Pending_Instantiations
.Increment_Last
;
2737 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
2738 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
2742 Set_Categorization_From_Pragmas
(Act_Decl
);
2744 if Parent_Installed
then
2748 Set_Instance_Spec
(N
, Act_Decl
);
2750 -- If not a compilation unit, insert the package declaration
2751 -- before the original instantiation node.
2753 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2754 Mark_Rewrite_Insertion
(Act_Decl
);
2755 Insert_Before
(N
, Act_Decl
);
2758 -- For an instantiation that is a compilation unit, place
2759 -- declaration on current node so context is complete
2760 -- for analysis (including nested instantiations). It this
2761 -- is the main unit, the declaration eventually replaces the
2762 -- instantiation node. If the instance body is later created, it
2763 -- replaces the instance node, and the declation is attached to
2764 -- it (see Build_Instance_Compilation_Unit_Nodes).
2767 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
2769 -- The entity for the current unit is the newly created one,
2770 -- and all semantic information is attached to it.
2772 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
2774 -- If this is the main unit, replace the main entity as well.
2776 if Current_Sem_Unit
= Main_Unit
then
2777 Main_Unit_Entity
:= Act_Decl_Id
;
2781 Set_Unit
(Parent
(N
), Act_Decl
);
2782 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
2784 Set_Unit
(Parent
(N
), N
);
2785 Set_Body_Required
(Parent
(N
), False);
2787 -- We never need elaboration checks on instantiations, since
2788 -- by definition, the body instantiation is elaborated at the
2789 -- same time as the spec instantiation.
2791 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
2792 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
2795 Check_Elab_Instantiation
(N
);
2797 if ABE_Is_Certain
(N
) and then Needs_Body
then
2798 Pending_Instantiations
.Decrement_Last
;
2800 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
2802 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
2803 First_Private_Entity
(Act_Decl_Id
));
2805 -- If the instantiation will receive a body, the unit will
2806 -- be transformed into a package body, and receive its own
2807 -- elaboration entity. Otherwise, the nature of the unit is
2808 -- now a package declaration.
2810 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2811 and then not Needs_Body
2813 Rewrite
(N
, Act_Decl
);
2816 if Present
(Corresponding_Body
(Gen_Decl
))
2817 or else Unit_Requires_Body
(Gen_Unit
)
2819 Set_Has_Completion
(Act_Decl_Id
);
2822 Check_Formal_Packages
(Act_Decl_Id
);
2824 Restore_Private_Views
(Act_Decl_Id
);
2826 if not Generic_Separately_Compiled
(Gen_Unit
) then
2827 Inherit_Context
(Gen_Decl
, N
);
2830 if Parent_Installed
then
2837 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
2839 -- Check restriction, but skip this if something went wrong in
2840 -- the above analysis, indicated by Act_Decl_Id being void.
2842 if Ekind
(Act_Decl_Id
) /= E_Void
2843 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
2845 Check_Restriction
(No_Local_Allocators
, N
);
2849 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
2852 -- The following is a tree patch for ASIS: ASIS needs separate nodes
2853 -- to be used as defining identifiers for a formal package and for the
2854 -- corresponding expanded package
2856 if Nkind
(N
) = N_Formal_Package_Declaration
then
2857 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2858 Set_Comes_From_Source
(Act_Decl_Id
, True);
2859 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
2860 Set_Defining_Identifier
(N
, Act_Decl_Id
);
2864 when Instantiation_Error
=>
2865 if Parent_Installed
then
2868 end Analyze_Package_Instantiation
;
2870 --------------------------
2871 -- Inline_Instance_Body --
2872 --------------------------
2874 procedure Inline_Instance_Body
2876 Gen_Unit
: Entity_Id
;
2880 Gen_Comp
: constant Entity_Id
:=
2881 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
2882 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
2883 Curr_Scope
: Entity_Id
:= Empty
;
2884 Curr_Unit
: constant Entity_Id
:=
2885 Cunit_Entity
(Current_Sem_Unit
);
2886 Removed
: Boolean := False;
2887 Num_Scopes
: Int
:= 0;
2888 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2889 Instances
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2890 Inner_Scopes
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2891 Num_Inner
: Int
:= 0;
2892 N_Instances
: Int
:= 0;
2896 -- Case of generic unit defined in another unit. We must remove
2897 -- the complete context of the current unit to install that of
2900 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
2904 and then S
/= Standard_Standard
2906 Num_Scopes
:= Num_Scopes
+ 1;
2908 Use_Clauses
(Num_Scopes
) :=
2910 (Scope_Stack
.Last
- Num_Scopes
+ 1).
2912 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
2914 exit when Is_Generic_Instance
(S
)
2915 and then (In_Package_Body
(S
)
2916 or else Ekind
(S
) = E_Procedure
2917 or else Ekind
(S
) = E_Function
);
2921 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
2923 -- Find and save all enclosing instances
2928 and then S
/= Standard_Standard
2930 if Is_Generic_Instance
(S
) then
2931 N_Instances
:= N_Instances
+ 1;
2932 Instances
(N_Instances
) := S
;
2934 exit when In_Package_Body
(S
);
2940 -- Remove context of current compilation unit, unless we
2941 -- are within a nested package instantiation, in which case
2942 -- the context has been removed previously.
2944 -- If current scope is the body of a child unit, remove context
2950 and then S
/= Standard_Standard
2952 exit when Is_Generic_Instance
(S
)
2953 and then (In_Package_Body
(S
)
2954 or else Ekind
(S
) = E_Procedure
2955 or else Ekind
(S
) = E_Function
);
2958 or else (Ekind
(Curr_Unit
) = E_Package_Body
2959 and then S
= Spec_Entity
(Curr_Unit
))
2960 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
2963 (Unit_Declaration_Node
(Curr_Unit
)))
2967 -- Remove entities in current scopes from visibility, so
2968 -- than instance body is compiled in a clean environment.
2970 Save_Scope_Stack
(Handle_Use
=> False);
2972 if Is_Child_Unit
(S
) then
2974 -- Remove child unit from stack, as well as inner scopes.
2975 -- Removing the context of a child unit removes parent
2978 while Current_Scope
/= S
loop
2979 Num_Inner
:= Num_Inner
+ 1;
2980 Inner_Scopes
(Num_Inner
) := Current_Scope
;
2985 Remove_Context
(Curr_Comp
);
2989 Remove_Context
(Curr_Comp
);
2992 if Ekind
(Curr_Unit
) = E_Package_Body
then
2993 Remove_Context
(Library_Unit
(Curr_Comp
));
3000 New_Scope
(Standard_Standard
);
3001 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3002 Instantiate_Package_Body
3003 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3008 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3010 -- Reset Generic_Instance flag so that use clauses can be installed
3011 -- in the proper order. (See Use_One_Package for effect of enclosing
3012 -- instances on processing of use clauses).
3014 for J
in 1 .. N_Instances
loop
3015 Set_Is_Generic_Instance
(Instances
(J
), False);
3019 Install_Context
(Curr_Comp
);
3021 if Present
(Curr_Scope
)
3022 and then Is_Child_Unit
(Curr_Scope
)
3024 New_Scope
(Curr_Scope
);
3025 Set_Is_Immediately_Visible
(Curr_Scope
);
3027 -- Finally, restore inner scopes as well.
3029 for J
in reverse 1 .. Num_Inner
loop
3030 New_Scope
(Inner_Scopes
(J
));
3034 Restore_Scope_Stack
(Handle_Use
=> False);
3037 -- Restore use clauses. For a child unit, use clauses in the
3038 -- parents are restored when installing the context, so only
3039 -- those in inner scopes (and those local to the child unit itself)
3040 -- need to be installed explicitly.
3042 if Is_Child_Unit
(Curr_Unit
)
3045 for J
in reverse 1 .. Num_Inner
+ 1 loop
3046 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3048 Install_Use_Clauses
(Use_Clauses
(J
));
3052 for J
in reverse 1 .. Num_Scopes
loop
3053 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3055 Install_Use_Clauses
(Use_Clauses
(J
));
3059 for J
in 1 .. N_Instances
loop
3060 Set_Is_Generic_Instance
(Instances
(J
), True);
3063 -- If generic unit is in current unit, current context is correct.
3066 Instantiate_Package_Body
3067 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3069 end Inline_Instance_Body
;
3071 -------------------------------------
3072 -- Analyze_Procedure_Instantiation --
3073 -------------------------------------
3075 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3077 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3078 end Analyze_Procedure_Instantiation
;
3080 --------------------------------------
3081 -- Analyze_Subprogram_Instantiation --
3082 --------------------------------------
3084 procedure Analyze_Subprogram_Instantiation
3088 Loc
: constant Source_Ptr
:= Sloc
(N
);
3089 Gen_Id
: constant Node_Id
:= Name
(N
);
3091 Anon_Id
: constant Entity_Id
:=
3092 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3093 Chars
=> New_External_Name
3094 (Chars
(Defining_Entity
(N
)), 'R'));
3096 Act_Decl_Id
: Entity_Id
;
3101 Gen_Unit
: Entity_Id
;
3103 Pack_Id
: Entity_Id
;
3104 Parent_Installed
: Boolean := False;
3105 Renaming_List
: List_Id
;
3107 procedure Analyze_Instance_And_Renamings
;
3108 -- The instance must be analyzed in a context that includes the
3109 -- mappings of generic parameters into actuals. We create a package
3110 -- declaration for this purpose, and a subprogram with an internal
3111 -- name within the package. The subprogram instance is simply an
3112 -- alias for the internal subprogram, declared in the current scope.
3114 ------------------------------------
3115 -- Analyze_Instance_And_Renamings --
3116 ------------------------------------
3118 procedure Analyze_Instance_And_Renamings
is
3119 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3120 Pack_Decl
: Node_Id
;
3123 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3125 -- For the case of a compilation unit, the container package
3126 -- has the same name as the instantiation, to insure that the
3127 -- binder calls the elaboration procedure with the right name.
3128 -- Copy the entity of the instance, which may have compilation
3129 -- level flags (e.g. Is_Child_Unit) set.
3131 Pack_Id
:= New_Copy
(Def_Ent
);
3134 -- Otherwise we use the name of the instantiation concatenated
3135 -- with its source position to ensure uniqueness if there are
3136 -- several instantiations with the same name.
3139 Make_Defining_Identifier
(Loc
,
3140 Chars
=> New_External_Name
3141 (Related_Id
=> Chars
(Def_Ent
),
3143 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3146 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3147 Specification
=> Make_Package_Specification
(Loc
,
3148 Defining_Unit_Name
=> Pack_Id
,
3149 Visible_Declarations
=> Renaming_List
,
3150 End_Label
=> Empty
));
3152 Set_Instance_Spec
(N
, Pack_Decl
);
3153 Set_Is_Generic_Instance
(Pack_Id
);
3154 Set_Needs_Debug_Info
(Pack_Id
);
3156 -- Case of not a compilation unit
3158 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3159 Mark_Rewrite_Insertion
(Pack_Decl
);
3160 Insert_Before
(N
, Pack_Decl
);
3161 Set_Has_Completion
(Pack_Id
);
3163 -- Case of an instantiation that is a compilation unit
3165 -- Place declaration on current node so context is complete
3166 -- for analysis (including nested instantiations), and for
3167 -- use in a context_clause (see Analyze_With_Clause).
3170 Set_Unit
(Parent
(N
), Pack_Decl
);
3171 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3174 Analyze
(Pack_Decl
);
3175 Check_Formal_Packages
(Pack_Id
);
3176 Set_Is_Generic_Instance
(Pack_Id
, False);
3178 -- Body of the enclosing package is supplied when instantiating
3179 -- the subprogram body, after semantic analysis is completed.
3181 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3183 -- Remove package itself from visibility, so it does not
3184 -- conflict with subprogram.
3186 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3188 -- Set name and scope of internal subprogram so that the
3189 -- proper external name will be generated. The proper scope
3190 -- is the scope of the wrapper package. We need to generate
3191 -- debugging information for the internal subprogram, so set
3192 -- flag accordingly.
3194 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3195 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3197 -- Mark wrapper package as referenced, to avoid spurious
3198 -- warnings if the instantiation appears in various with_
3199 -- clauses of subunits of the main unit.
3201 Set_Referenced
(Pack_Id
);
3204 Set_Is_Generic_Instance
(Anon_Id
);
3205 Set_Needs_Debug_Info
(Anon_Id
);
3206 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3208 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3209 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3210 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3211 Set_Comes_From_Source
(Act_Decl_Id
, True);
3213 -- The signature may involve types that are not frozen yet, but
3214 -- the subprogram will be frozen at the point the wrapper package
3215 -- is frozen, so it does not need its own freeze node. In fact, if
3216 -- one is created, it might conflict with the freezing actions from
3217 -- the wrapper package (see 7206-013).
3219 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3221 -- If the instance is a child unit, mark the Id accordingly. Mark
3222 -- the anonymous entity as well, which is the real subprogram and
3223 -- which is used when the instance appears in a context clause.
3225 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3226 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3227 New_Overloaded_Entity
(Act_Decl_Id
);
3228 Check_Eliminated
(Act_Decl_Id
);
3230 -- In compilation unit case, kill elaboration checks on the
3231 -- instantiation, since they are never needed -- the body is
3232 -- instantiated at the same point as the spec.
3234 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3235 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3236 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3237 Set_Is_Compilation_Unit
(Anon_Id
);
3239 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3242 -- The instance is not a freezing point for the new subprogram.
3244 Set_Is_Frozen
(Act_Decl_Id
, False);
3246 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3247 Valid_Operator_Definition
(Act_Decl_Id
);
3250 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3251 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3252 Set_Has_Completion
(Act_Decl_Id
);
3253 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3255 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3256 Set_Body_Required
(Parent
(N
), False);
3259 end Analyze_Instance_And_Renamings
;
3261 -- Start of processing for Analyze_Subprogram_Instantiation
3264 -- Very first thing: apply the special kludge for Text_IO processing
3265 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3266 -- Of course such an instantiation is bogus (these are packages, not
3267 -- subprograms), but we get a better error message if we do this.
3269 Text_IO_Kludge
(Gen_Id
);
3271 -- Make node global for error reporting.
3273 Instantiation_Node
:= N
;
3274 Pre_Analyze_Actuals
(N
);
3277 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3278 Gen_Unit
:= Entity
(Gen_Id
);
3280 Generate_Reference
(Gen_Unit
, Gen_Id
);
3282 if Nkind
(Gen_Id
) = N_Identifier
3283 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3286 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3289 if Etype
(Gen_Unit
) = Any_Type
then
3294 -- Verify that it is a generic subprogram of the right kind, and that
3295 -- it does not lead to a circular instantiation.
3297 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3298 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3300 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3302 elsif In_Open_Scopes
(Gen_Unit
) then
3303 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3305 elsif K
= E_Procedure
3306 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3308 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3310 ("cannot instantiate generic function as procedure", Gen_Id
);
3313 ("expect name of generic procedure in instantiation", Gen_Id
);
3316 elsif K
= E_Function
3317 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3319 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3321 ("cannot instantiate generic procedure as function", Gen_Id
);
3324 ("expect name of generic function in instantiation", Gen_Id
);
3328 Set_Entity
(Gen_Id
, Gen_Unit
);
3329 Set_Is_Instantiated
(Gen_Unit
);
3331 if In_Extended_Main_Source_Unit
(N
) then
3332 Generate_Reference
(Gen_Unit
, N
);
3335 -- If renaming, get original unit
3337 if Present
(Renamed_Object
(Gen_Unit
))
3338 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
3340 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
3342 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3343 Set_Is_Instantiated
(Gen_Unit
);
3344 Generate_Reference
(Gen_Unit
, N
);
3347 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3348 Error_Msg_Node_2
:= Current_Scope
;
3350 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3351 Circularity_Detected
:= True;
3355 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3357 -- The subprogram itself cannot contain a nested instance, so
3358 -- the current parent is left empty.
3360 Set_Instance_Env
(Gen_Unit
, Empty
);
3362 -- Initialize renamings map, for error checking.
3364 Generic_Renamings
.Set_Last
(0);
3365 Generic_Renamings_HTable
.Reset
;
3367 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3369 -- Copy original generic tree, to produce text for instantiation.
3373 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3375 Act_Spec
:= Specification
(Act_Tree
);
3377 Analyze_Associations
3379 Generic_Formal_Declarations
(Act_Tree
),
3380 Generic_Formal_Declarations
(Gen_Decl
));
3382 -- Build the subprogram declaration, which does not appear
3383 -- in the generic template, and give it a sloc consistent
3384 -- with that of the template.
3386 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
3387 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3389 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
3390 Specification
=> Act_Spec
);
3392 Set_Categorization_From_Pragmas
(Act_Decl
);
3394 if Parent_Installed
then
3398 Append
(Act_Decl
, Renaming_List
);
3399 Analyze_Instance_And_Renamings
;
3401 -- If the generic is marked Import (Intrinsic), then so is the
3402 -- instance. This indicates that there is no body to instantiate.
3403 -- If generic is marked inline, so it the instance, and the
3404 -- anonymous subprogram it renames. If inlined, or else if inlining
3405 -- is enabled for the compilation, we generate the instance body
3406 -- even if it is not within the main unit.
3408 -- Any other pragmas might also be inherited ???
3410 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
3411 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
3412 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
3414 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
3415 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
3419 Generate_Definition
(Act_Decl_Id
);
3421 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
3422 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
3424 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
3425 Check_Elab_Instantiation
(N
);
3428 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3430 -- Subject to change, pending on if other pragmas are inherited ???
3432 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3434 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
3436 if not Generic_Separately_Compiled
(Gen_Unit
) then
3437 Inherit_Context
(Gen_Decl
, N
);
3440 Restore_Private_Views
(Pack_Id
, False);
3442 -- If the context requires a full instantiation, mark node for
3443 -- subsequent construction of the body.
3445 if (Is_In_Main_Unit
(N
)
3446 or else Is_Inlined
(Act_Decl_Id
))
3447 and then (Operating_Mode
= Generate_Code
3448 or else (Operating_Mode
= Check_Semantics
3449 and then ASIS_Mode
))
3450 and then (Expander_Active
or else ASIS_Mode
)
3451 and then not ABE_Is_Certain
(N
)
3452 and then not Is_Eliminated
(Act_Decl_Id
)
3454 Pending_Instantiations
.Increment_Last
;
3455 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
3456 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
3457 Check_Forward_Instantiation
(Gen_Decl
);
3459 -- The wrapper package is always delayed, because it does
3460 -- not constitute a freeze point, but to insure that the
3461 -- freeze node is placed properly, it is created directly
3462 -- when instantiating the body (otherwise the freeze node
3463 -- might appear to early for nested instantiations).
3465 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3467 -- For ASIS purposes, indicate that the wrapper package has
3468 -- replaced the instantiation node.
3470 Rewrite
(N
, Unit
(Parent
(N
)));
3471 Set_Unit
(Parent
(N
), N
);
3474 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3476 -- Replace instance node for library-level instantiations
3477 -- of intrinsic subprograms, for ASIS use.
3479 Rewrite
(N
, Unit
(Parent
(N
)));
3480 Set_Unit
(Parent
(N
), N
);
3483 if Parent_Installed
then
3488 Generic_Renamings
.Set_Last
(0);
3489 Generic_Renamings_HTable
.Reset
;
3493 when Instantiation_Error
=>
3494 if Parent_Installed
then
3497 end Analyze_Subprogram_Instantiation
;
3499 -------------------------
3500 -- Get_Associated_Node --
3501 -------------------------
3503 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
3504 Assoc
: Node_Id
:= Associated_Node
(N
);
3507 if Nkind
(Assoc
) /= Nkind
(N
) then
3510 elsif Nkind
(Assoc
) = N_Aggregate
3511 or else Nkind
(Assoc
) = N_Extension_Aggregate
3516 -- If the node is part of an inner generic, it may itself have been
3517 -- remapped into a further generic copy. Associated_Node is otherwise
3518 -- used for the entity of the node, and will be of a different node
3519 -- kind, or else N has been rewritten as a literal or function call.
3521 while Present
(Associated_Node
(Assoc
))
3522 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
3524 Assoc
:= Associated_Node
(Assoc
);
3527 -- Follow and additional link in case the final node was rewritten.
3528 -- This can only happen with nested generic units.
3530 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
3531 and then Present
(Associated_Node
(Assoc
))
3532 and then (Nkind
(Associated_Node
(Assoc
)) = N_Function_Call
3534 Nkind
(Associated_Node
(Assoc
)) = N_Explicit_Dereference
3536 Nkind
(Associated_Node
(Assoc
)) = N_Integer_Literal
3538 Nkind
(Associated_Node
(Assoc
)) = N_Real_Literal
3540 Nkind
(Associated_Node
(Assoc
)) = N_String_Literal
)
3542 Assoc
:= Associated_Node
(Assoc
);
3547 end Get_Associated_Node
;
3549 -------------------------------------------
3550 -- Build_Instance_Compilation_Unit_Nodes --
3551 -------------------------------------------
3553 procedure Build_Instance_Compilation_Unit_Nodes
3558 Decl_Cunit
: Node_Id
;
3559 Body_Cunit
: Node_Id
;
3561 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
3562 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
3565 -- A new compilation unit node is built for the instance declaration
3568 Make_Compilation_Unit
(Sloc
(N
),
3569 Context_Items
=> Empty_List
,
3572 Make_Compilation_Unit_Aux
(Sloc
(N
)));
3574 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3575 Set_Body_Required
(Decl_Cunit
, True);
3577 -- We use the original instantiation compilation unit as the resulting
3578 -- compilation unit of the instance, since this is the main unit.
3580 Rewrite
(N
, Act_Body
);
3581 Body_Cunit
:= Parent
(N
);
3583 -- The two compilation unit nodes are linked by the Library_Unit field
3585 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
3586 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
3588 -- Preserve the private nature of the package if needed.
3590 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
3592 -- If the instance is not the main unit, its context, categorization,
3593 -- and elaboration entity are not relevant to the compilation.
3595 if Parent
(N
) /= Cunit
(Main_Unit
) then
3599 -- The context clause items on the instantiation, which are now
3600 -- attached to the body compilation unit (since the body overwrote
3601 -- the original instantiation node), semantically belong on the spec,
3602 -- so copy them there. It's harmless to leave them on the body as well.
3603 -- In fact one could argue that they belong in both places.
3605 Citem
:= First
(Context_Items
(Body_Cunit
));
3606 while Present
(Citem
) loop
3607 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
3611 -- Propagate categorization flags on packages, so that they appear
3612 -- in ali file for the spec of the unit.
3614 if Ekind
(New_Main
) = E_Package
then
3615 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
3616 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
3617 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
3618 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
3619 Set_Is_Remote_Call_Interface
3620 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
3623 -- Make entry in Units table, so that binder can generate call to
3624 -- elaboration procedure for body, if any.
3626 Make_Instance_Unit
(Body_Cunit
);
3627 Main_Unit_Entity
:= New_Main
;
3628 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
3630 -- Build elaboration entity, since the instance may certainly
3631 -- generate elaboration code requiring a flag for protection.
3633 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
3634 end Build_Instance_Compilation_Unit_Nodes
;
3636 -----------------------------------
3637 -- Check_Formal_Package_Instance --
3638 -----------------------------------
3640 -- If the formal has specific parameters, they must match those of the
3641 -- actual. Both of them are instances, and the renaming declarations
3642 -- for their formal parameters appear in the same order in both. The
3643 -- analyzed formal has been analyzed in the context of the current
3646 procedure Check_Formal_Package_Instance
3647 (Formal_Pack
: Entity_Id
;
3648 Actual_Pack
: Entity_Id
)
3650 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
3651 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
3656 procedure Check_Mismatch
(B
: Boolean);
3657 -- Common error routine for mismatch between the parameters of
3658 -- the actual instance and those of the formal package.
3660 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
3661 -- The formal may come from a nested formal package, and the actual
3662 -- may have been constant-folded. To determine whether the two denote
3663 -- the same entity we may have to traverse several definitions to
3664 -- recover the ultimate entity that they refer to.
3666 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
3667 -- Similarly, if the formal comes from a nested formal package, the
3668 -- actual may designate the formal through multiple renamings, which
3669 -- have to be followed to determine the original variable in question.
3671 --------------------
3672 -- Check_Mismatch --
3673 --------------------
3675 procedure Check_Mismatch
(B
: Boolean) is
3679 ("actual for & in actual instance does not match formal",
3680 Parent
(Actual_Pack
), E1
);
3684 --------------------------------
3685 -- Same_Instantiated_Constant --
3686 --------------------------------
3688 function Same_Instantiated_Constant
3689 (E1
, E2
: Entity_Id
) return Boolean
3694 while Present
(Ent
) loop
3698 elsif Ekind
(Ent
) /= E_Constant
then
3701 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
3702 if Entity
(Constant_Value
(Ent
)) = E1
then
3705 Ent
:= Entity
(Constant_Value
(Ent
));
3708 -- The actual may be a constant that has been folded. Recover
3711 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
3712 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
3719 end Same_Instantiated_Constant
;
3721 --------------------------------
3722 -- Same_Instantiated_Variable --
3723 --------------------------------
3725 function Same_Instantiated_Variable
3726 (E1
, E2
: Entity_Id
) return Boolean
3728 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
3729 -- Follow chain of renamings to the ultimate ancestor.
3731 ---------------------
3732 -- Original_Entity --
3733 ---------------------
3735 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
3740 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
3741 and then Present
(Renamed_Object
(Orig
))
3742 and then Is_Entity_Name
(Renamed_Object
(Orig
))
3744 Orig
:= Entity
(Renamed_Object
(Orig
));
3748 end Original_Entity
;
3750 -- Start of processing for Same_Instantiated_Variable
3753 return Ekind
(E1
) = Ekind
(E2
)
3754 and then Original_Entity
(E1
) = Original_Entity
(E2
);
3755 end Same_Instantiated_Variable
;
3757 -- Start of processing for Check_Formal_Package_Instance
3761 and then Present
(E2
)
3763 exit when Ekind
(E1
) = E_Package
3764 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
3766 if Is_Type
(E1
) then
3768 -- Subtypes must statically match. E1 and E2 are the
3769 -- local entities that are subtypes of the actuals.
3770 -- Itypes generated for other parameters need not be checked,
3771 -- the check will be performed on the parameters themselves.
3773 if not Is_Itype
(E1
)
3774 and then not Is_Itype
(E2
)
3778 or else Etype
(E1
) /= Etype
(E2
)
3779 or else not Subtypes_Statically_Match
(E1
, E2
));
3782 elsif Ekind
(E1
) = E_Constant
then
3784 -- IN parameters must denote the same static value, or
3785 -- the same constant, or the literal null.
3787 Expr1
:= Expression
(Parent
(E1
));
3789 if Ekind
(E2
) /= E_Constant
then
3790 Check_Mismatch
(True);
3793 Expr2
:= Expression
(Parent
(E2
));
3796 if Is_Static_Expression
(Expr1
) then
3798 if not Is_Static_Expression
(Expr2
) then
3799 Check_Mismatch
(True);
3801 elsif Is_Integer_Type
(Etype
(E1
)) then
3804 V1
: constant Uint
:= Expr_Value
(Expr1
);
3805 V2
: constant Uint
:= Expr_Value
(Expr2
);
3807 Check_Mismatch
(V1
/= V2
);
3810 elsif Is_Real_Type
(Etype
(E1
)) then
3812 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
3813 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
3815 Check_Mismatch
(V1
/= V2
);
3818 elsif Is_String_Type
(Etype
(E1
))
3819 and then Nkind
(Expr1
) = N_String_Literal
3822 if Nkind
(Expr2
) /= N_String_Literal
then
3823 Check_Mismatch
(True);
3826 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
3830 elsif Is_Entity_Name
(Expr1
) then
3831 if Is_Entity_Name
(Expr2
) then
3832 if Entity
(Expr1
) = Entity
(Expr2
) then
3836 (not Same_Instantiated_Constant
3837 (Entity
(Expr1
), Entity
(Expr2
)));
3840 Check_Mismatch
(True);
3843 elsif Is_Entity_Name
(Original_Node
(Expr1
))
3844 and then Is_Entity_Name
(Expr2
)
3846 Same_Instantiated_Constant
3847 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
3851 elsif Nkind
(Expr1
) = N_Null
then
3852 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
3855 Check_Mismatch
(True);
3858 elsif Ekind
(E1
) = E_Variable
then
3859 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
3861 elsif Ekind
(E1
) = E_Package
then
3863 (Ekind
(E1
) /= Ekind
(E2
)
3864 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
3866 elsif Is_Overloadable
(E1
) then
3868 -- Verify that the names of the entities match.
3869 -- What if actual is an attribute ???
3872 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
3875 raise Program_Error
;
3882 end Check_Formal_Package_Instance
;
3884 ---------------------------
3885 -- Check_Formal_Packages --
3886 ---------------------------
3888 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
3890 Formal_P
: Entity_Id
;
3893 -- Iterate through the declarations in the instance, looking for
3894 -- package renaming declarations that denote instances of formal
3895 -- packages. Stop when we find the renaming of the current package
3896 -- itself. The declaration for a formal package without a box is
3897 -- followed by an internal entity that repeats the instantiation.
3899 E
:= First_Entity
(P_Id
);
3900 while Present
(E
) loop
3901 if Ekind
(E
) = E_Package
then
3902 if Renamed_Object
(E
) = P_Id
then
3905 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
3908 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
3909 Formal_P
:= Next_Entity
(E
);
3910 Check_Formal_Package_Instance
(Formal_P
, E
);
3916 end Check_Formal_Packages
;
3918 ---------------------------------
3919 -- Check_Forward_Instantiation --
3920 ---------------------------------
3922 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
3924 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
3927 -- The instantiation appears before the generic body if we are in the
3928 -- scope of the unit containing the generic, either in its spec or in
3929 -- the package body. and before the generic body.
3931 if Ekind
(Gen_Comp
) = E_Package_Body
then
3932 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
3935 if In_Open_Scopes
(Gen_Comp
)
3936 and then No
(Corresponding_Body
(Decl
))
3941 and then not Is_Compilation_Unit
(S
)
3942 and then not Is_Child_Unit
(S
)
3944 if Ekind
(S
) = E_Package
then
3945 Set_Has_Forward_Instantiation
(S
);
3951 end Check_Forward_Instantiation
;
3953 ---------------------------
3954 -- Check_Generic_Actuals --
3955 ---------------------------
3957 -- The visibility of the actuals may be different between the
3958 -- point of generic instantiation and the instantiation of the body.
3960 procedure Check_Generic_Actuals
3961 (Instance
: Entity_Id
;
3962 Is_Formal_Box
: Boolean)
3967 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
3968 -- For a formal that is an array type, the component type is often
3969 -- a previous formal in the same unit. The privacy status of the
3970 -- component type will have been examined earlier in the traversal
3971 -- of the corresponding actuals, and this status should not be
3972 -- modified for the array type itself.
3973 -- To detect this case we have to rescan the list of formals, which
3974 -- is usually short enough to ignore the resulting inefficiency.
3976 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
3979 Prev
:= First_Entity
(Instance
);
3980 while Present
(Prev
) loop
3982 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
3983 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
3984 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
3994 end Denotes_Previous_Actual
;
3996 -- Start of processing for Check_Generic_Actuals
3999 E
:= First_Entity
(Instance
);
4000 while Present
(E
) loop
4002 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4003 and then Scope
(Etype
(E
)) /= Instance
4004 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4006 if Is_Array_Type
(E
)
4007 and then Denotes_Previous_Actual
(Component_Type
(E
))
4011 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4013 Set_Is_Generic_Actual_Type
(E
, True);
4014 Set_Is_Hidden
(E
, False);
4015 Set_Is_Potentially_Use_Visible
(E
,
4018 -- We constructed the generic actual type as a subtype of
4019 -- the supplied type. This means that it normally would not
4020 -- inherit subtype specific attributes of the actual, which
4021 -- is wrong for the generic case.
4023 Astype
:= Ancestor_Subtype
(E
);
4027 -- can happen when E is an itype that is the full view of
4028 -- a private type completed, e.g. with a constrained array.
4030 Astype
:= Base_Type
(E
);
4033 Set_Size_Info
(E
, (Astype
));
4034 Set_RM_Size
(E
, RM_Size
(Astype
));
4035 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4037 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4038 Set_RM_Size
(E
, RM_Size
(Astype
));
4040 -- In nested instances, the base type of an access actual
4041 -- may itself be private, and need to be exchanged.
4043 elsif Is_Access_Type
(E
)
4044 and then Is_Private_Type
(Etype
(E
))
4047 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4050 elsif Ekind
(E
) = E_Package
then
4052 -- If this is the renaming for the current instance, we're done.
4053 -- Otherwise it is a formal package. If the corresponding formal
4054 -- was declared with a box, the (instantiations of the) generic
4055 -- formal part are also visible. Otherwise, ignore the entity
4056 -- created to validate the actuals.
4058 if Renamed_Object
(E
) = Instance
then
4061 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4064 -- The visibility of a formal of an enclosing generic is already
4067 elsif Denotes_Formal_Package
(E
) then
4070 elsif Present
(Associated_Formal_Package
(E
)) then
4071 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4072 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4075 Set_Is_Hidden
(E
, False);
4078 -- If this is a subprogram instance (in a wrapper package) the
4079 -- actual is fully visible.
4081 elsif Is_Wrapper_Package
(Instance
) then
4082 Set_Is_Hidden
(E
, False);
4085 Set_Is_Hidden
(E
, not Is_Formal_Box
);
4090 end Check_Generic_Actuals
;
4092 ------------------------------
4093 -- Check_Generic_Child_Unit --
4094 ------------------------------
4096 procedure Check_Generic_Child_Unit
4098 Parent_Installed
: in out Boolean)
4100 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4101 Gen_Par
: Entity_Id
:= Empty
;
4102 Inst_Par
: Entity_Id
;
4106 function Find_Generic_Child
4108 Id
: Node_Id
) return Entity_Id
;
4109 -- Search generic parent for possible child unit with the given name.
4111 function In_Enclosing_Instance
return Boolean;
4112 -- Within an instance of the parent, the child unit may be denoted
4113 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4114 -- scopes to locate a possible parent instantiation.
4116 ------------------------
4117 -- Find_Generic_Child --
4118 ------------------------
4120 function Find_Generic_Child
4122 Id
: Node_Id
) return Entity_Id
4127 -- If entity of name is already set, instance has already been
4128 -- resolved, e.g. in an enclosing instantiation.
4130 if Present
(Entity
(Id
)) then
4131 if Scope
(Entity
(Id
)) = Scop
then
4138 E
:= First_Entity
(Scop
);
4139 while Present
(E
) loop
4140 if Chars
(E
) = Chars
(Id
)
4141 and then Is_Child_Unit
(E
)
4143 if Is_Child_Unit
(E
)
4144 and then not Is_Visible_Child_Unit
(E
)
4147 ("generic child unit& is not visible", Gen_Id
, E
);
4159 end Find_Generic_Child
;
4161 ---------------------------
4162 -- In_Enclosing_Instance --
4163 ---------------------------
4165 function In_Enclosing_Instance
return Boolean is
4166 Enclosing_Instance
: Node_Id
;
4167 Instance_Decl
: Node_Id
;
4170 Enclosing_Instance
:= Current_Scope
;
4172 while Present
(Enclosing_Instance
) loop
4173 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4175 if Ekind
(Enclosing_Instance
) = E_Package
4176 and then Is_Generic_Instance
(Enclosing_Instance
)
4178 (Generic_Parent
(Specification
(Instance_Decl
)))
4180 -- Check whether the generic we are looking for is a child
4181 -- of this instance.
4183 E
:= Find_Generic_Child
4184 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4185 exit when Present
(E
);
4191 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
4203 Make_Expanded_Name
(Loc
,
4205 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
4206 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
4208 Set_Entity
(Gen_Id
, E
);
4209 Set_Etype
(Gen_Id
, Etype
(E
));
4210 Parent_Installed
:= False; -- Already in scope.
4213 end In_Enclosing_Instance
;
4215 -- Start of processing for Check_Generic_Child_Unit
4218 -- If the name of the generic is given by a selected component, it
4219 -- may be the name of a generic child unit, and the prefix is the name
4220 -- of an instance of the parent, in which case the child unit must be
4221 -- visible. If this instance is not in scope, it must be placed there
4222 -- and removed after instantiation, because what is being instantiated
4223 -- is not the original child, but the corresponding child present in
4224 -- the instance of the parent.
4226 -- If the child is instantiated within the parent, it can be given by
4227 -- a simple name. In this case the instance is already in scope, but
4228 -- the child generic must be recovered from the generic parent as well.
4230 if Nkind
(Gen_Id
) = N_Selected_Component
then
4231 S
:= Selector_Name
(Gen_Id
);
4232 Analyze
(Prefix
(Gen_Id
));
4233 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4235 if Ekind
(Inst_Par
) = E_Package
4236 and then Present
(Renamed_Object
(Inst_Par
))
4238 Inst_Par
:= Renamed_Object
(Inst_Par
);
4241 if Ekind
(Inst_Par
) = E_Package
then
4242 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
4243 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
4245 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
4247 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
4249 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
4252 elsif Ekind
(Inst_Par
) = E_Generic_Package
4253 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
4255 -- A formal package may be a real child package, and not the
4256 -- implicit instance within a parent. In this case the child is
4257 -- not visible and has to be retrieved explicitly as well.
4259 Gen_Par
:= Inst_Par
;
4262 if Present
(Gen_Par
) then
4264 -- The prefix denotes an instantiation. The entity itself
4265 -- may be a nested generic, or a child unit.
4267 E
:= Find_Generic_Child
(Gen_Par
, S
);
4270 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
4271 Set_Entity
(Gen_Id
, E
);
4272 Set_Etype
(Gen_Id
, Etype
(E
));
4274 Set_Etype
(S
, Etype
(E
));
4276 -- Indicate that this is a reference to the parent.
4278 if In_Extended_Main_Source_Unit
(Gen_Id
) then
4279 Set_Is_Instantiated
(Inst_Par
);
4282 -- A common mistake is to replicate the naming scheme of
4283 -- a hierarchy by instantiating a generic child directly,
4284 -- rather than the implicit child in a parent instance:
4286 -- generic .. package Gpar is ..
4287 -- generic .. package Gpar.Child is ..
4288 -- package Par is new Gpar ();
4291 -- package Par.Child is new Gpar.Child ();
4292 -- rather than Par.Child
4294 -- In this case the instantiation is within Par, which is
4295 -- an instance, but Gpar does not denote Par because we are
4296 -- not IN the instance of Gpar, so this is illegal. The test
4297 -- below recognizes this particular case.
4299 if Is_Child_Unit
(E
)
4300 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
4301 and then (not In_Instance
4302 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
4306 ("prefix of generic child unit must be instance of parent",
4310 if not In_Open_Scopes
(Inst_Par
)
4311 and then Nkind
(Parent
(Gen_Id
)) not in
4312 N_Generic_Renaming_Declaration
4314 Install_Parent
(Inst_Par
);
4315 Parent_Installed
:= True;
4319 -- If the generic parent does not contain an entity that
4320 -- corresponds to the selector, the instance doesn't either.
4321 -- Analyzing the node will yield the appropriate error message.
4322 -- If the entity is not a child unit, then it is an inner
4323 -- generic in the parent.
4331 if Is_Child_Unit
(Entity
(Gen_Id
))
4333 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4334 and then not In_Open_Scopes
(Inst_Par
)
4336 Install_Parent
(Inst_Par
);
4337 Parent_Installed
:= True;
4341 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
4343 -- Entity already present, analyze prefix, whose meaning may be
4344 -- an instance in the current context. If it is an instance of
4345 -- a relative within another, the proper parent may still have
4346 -- to be installed, if they are not of the same generation.
4348 Analyze
(Prefix
(Gen_Id
));
4349 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4351 if In_Enclosing_Instance
then
4354 elsif Present
(Entity
(Gen_Id
))
4355 and then Is_Child_Unit
(Entity
(Gen_Id
))
4356 and then not In_Open_Scopes
(Inst_Par
)
4358 Install_Parent
(Inst_Par
);
4359 Parent_Installed
:= True;
4362 elsif In_Enclosing_Instance
then
4364 -- The child unit is found in some enclosing scope
4371 -- If this is the renaming of the implicit child in a parent
4372 -- instance, recover the parent name and install it.
4374 if Is_Entity_Name
(Gen_Id
) then
4375 E
:= Entity
(Gen_Id
);
4377 if Is_Generic_Unit
(E
)
4378 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
4379 and then Is_Child_Unit
(Renamed_Object
(E
))
4380 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
4381 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
4384 New_Copy_Tree
(Name
(Parent
(E
))));
4385 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4387 if not In_Open_Scopes
(Inst_Par
) then
4388 Install_Parent
(Inst_Par
);
4389 Parent_Installed
:= True;
4392 -- If it is a child unit of a non-generic parent, it may be
4393 -- use-visible and given by a direct name. Install parent as
4396 elsif Is_Generic_Unit
(E
)
4397 and then Is_Child_Unit
(E
)
4399 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4400 and then not Is_Generic_Unit
(Scope
(E
))
4402 if not In_Open_Scopes
(Scope
(E
)) then
4403 Install_Parent
(Scope
(E
));
4404 Parent_Installed
:= True;
4409 end Check_Generic_Child_Unit
;
4411 -----------------------------
4412 -- Check_Hidden_Child_Unit --
4413 -----------------------------
4415 procedure Check_Hidden_Child_Unit
4417 Gen_Unit
: Entity_Id
;
4418 Act_Decl_Id
: Entity_Id
)
4420 Gen_Id
: constant Node_Id
:= Name
(N
);
4423 if Is_Child_Unit
(Gen_Unit
)
4424 and then Is_Child_Unit
(Act_Decl_Id
)
4425 and then Nkind
(Gen_Id
) = N_Expanded_Name
4426 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
4427 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
4429 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
4431 ("generic unit & is implicitly declared in &",
4432 Defining_Unit_Name
(N
), Gen_Unit
);
4433 Error_Msg_N
("\instance must have different name",
4434 Defining_Unit_Name
(N
));
4436 end Check_Hidden_Child_Unit
;
4438 ------------------------
4439 -- Check_Private_View --
4440 ------------------------
4442 procedure Check_Private_View
(N
: Node_Id
) is
4443 T
: constant Entity_Id
:= Etype
(N
);
4447 -- Exchange views if the type was not private in the generic but is
4448 -- private at the point of instantiation. Do not exchange views if
4449 -- the scope of the type is in scope. This can happen if both generic
4450 -- and instance are sibling units, or if type is defined in a parent.
4451 -- In this case the visibility of the type will be correct for all
4455 BT
:= Base_Type
(T
);
4457 if Is_Private_Type
(T
)
4458 and then not Has_Private_View
(N
)
4459 and then Present
(Full_View
(T
))
4460 and then not In_Open_Scopes
(Scope
(T
))
4462 -- In the generic, the full type was visible. Save the
4463 -- private entity, for subsequent exchange.
4467 elsif Has_Private_View
(N
)
4468 and then not Is_Private_Type
(T
)
4469 and then not Has_Been_Exchanged
(T
)
4470 and then Etype
(Get_Associated_Node
(N
)) /= T
4472 -- Only the private declaration was visible in the generic. If
4473 -- the type appears in a subtype declaration, the subtype in the
4474 -- instance must have a view compatible with that of its parent,
4475 -- which must be exchanged (see corresponding code in Restore_
4476 -- Private_Views). Otherwise, if the type is defined in a parent
4477 -- unit, leave full visibility within instance, which is safe.
4479 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
4480 and then not Is_Private_Type
(Base_Type
(T
))
4481 and then Comes_From_Source
(Base_Type
(T
))
4485 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
4486 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
4488 Append_Elmt
(T
, Exchanged_Views
);
4489 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
4492 -- For composite types with inconsistent representation
4493 -- exchange component types accordingly.
4495 elsif Is_Access_Type
(T
)
4496 and then Is_Private_Type
(Designated_Type
(T
))
4497 and then not Has_Private_View
(N
)
4498 and then Present
(Full_View
(Designated_Type
(T
)))
4500 Switch_View
(Designated_Type
(T
));
4502 elsif Is_Array_Type
(T
)
4503 and then Is_Private_Type
(Component_Type
(T
))
4504 and then not Has_Private_View
(N
)
4505 and then Present
(Full_View
(Component_Type
(T
)))
4507 Switch_View
(Component_Type
(T
));
4509 elsif Is_Private_Type
(T
)
4510 and then Present
(Full_View
(T
))
4511 and then Is_Array_Type
(Full_View
(T
))
4512 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
4516 -- Finally, a non-private subtype may have a private base type,
4517 -- which must be exchanged for consistency. This can happen when
4518 -- instantiating a package body, when the scope stack is empty
4519 -- but in fact the subtype and the base type are declared in an
4522 elsif not Is_Private_Type
(T
)
4523 and then not Has_Private_View
(N
)
4524 and then Is_Private_Type
(Base_Type
(T
))
4525 and then Present
(Full_View
(BT
))
4526 and then not Is_Generic_Type
(BT
)
4527 and then not In_Open_Scopes
(BT
)
4529 Append_Elmt
(Full_View
(BT
), Exchanged_Views
);
4530 Exchange_Declarations
(BT
);
4533 end Check_Private_View
;
4535 --------------------------
4536 -- Contains_Instance_Of --
4537 --------------------------
4539 function Contains_Instance_Of
4542 N
: Node_Id
) return Boolean
4550 -- Verify that there are no circular instantiations. We check whether
4551 -- the unit contains an instance of the current scope or some enclosing
4552 -- scope (in case one of the instances appears in a subunit). Longer
4553 -- circularities involving subunits might seem too pathological to
4554 -- consider, but they were not too pathological for the authors of
4555 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4556 -- enclosing generic scopes as containing an instance.
4559 -- Within a generic subprogram body, the scope is not generic, to
4560 -- allow for recursive subprograms. Use the declaration to determine
4561 -- whether this is a generic unit.
4563 if Ekind
(Scop
) = E_Generic_Package
4564 or else (Is_Subprogram
(Scop
)
4565 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
4566 N_Generic_Subprogram_Declaration
)
4568 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
4570 while Present
(Elmt
) loop
4571 if Node
(Elmt
) = Scop
then
4572 Error_Msg_Node_2
:= Inner
;
4574 ("circular Instantiation: & instantiated within &!",
4578 elsif Node
(Elmt
) = Inner
then
4581 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
4582 Error_Msg_Node_2
:= Inner
;
4584 ("circular Instantiation: & instantiated within &!",
4592 -- Indicate that Inner is being instantiated within Scop.
4594 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
4597 if Scop
= Standard_Standard
then
4600 Scop
:= Scope
(Scop
);
4605 end Contains_Instance_Of
;
4607 -----------------------
4608 -- Copy_Generic_Node --
4609 -----------------------
4611 function Copy_Generic_Node
4613 Parent_Id
: Node_Id
;
4614 Instantiating
: Boolean) return Node_Id
4619 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
4620 -- Check the given value of one of the Fields referenced by the
4621 -- current node to determine whether to copy it recursively. The
4622 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4623 -- value (Sloc, Uint, Char) in which case it need not be copied.
4625 procedure Copy_Descendants
;
4626 -- Common utility for various nodes.
4628 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
4629 -- Make copy of element list.
4631 function Copy_Generic_List
4633 Parent_Id
: Node_Id
) return List_Id
;
4634 -- Apply Copy_Node recursively to the members of a node list.
4636 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
4637 -- True if an identifier is part of the defining program unit name
4638 -- of a child unit. The entity of such an identifier must be kept
4639 -- (for ASIS use) even though as the name of an enclosing generic
4640 -- it would otherwise not be preserved in the generic tree.
4642 ----------------------
4643 -- Copy_Descendants --
4644 ----------------------
4646 procedure Copy_Descendants
is
4648 use Atree
.Unchecked_Access
;
4649 -- This code section is part of the implementation of an untyped
4650 -- tree traversal, so it needs direct access to node fields.
4653 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
4654 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
4655 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
4656 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
4657 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
4658 end Copy_Descendants
;
4660 -----------------------------
4661 -- Copy_Generic_Descendant --
4662 -----------------------------
4664 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
4666 if D
= Union_Id
(Empty
) then
4669 elsif D
in Node_Range
then
4671 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
4673 elsif D
in List_Range
then
4674 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
4676 elsif D
in Elist_Range
then
4677 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
4679 -- Nothing else is copyable (e.g. Uint values), return as is
4684 end Copy_Generic_Descendant
;
4686 ------------------------
4687 -- Copy_Generic_Elist --
4688 ------------------------
4690 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
4697 M
:= First_Elmt
(E
);
4698 while Present
(M
) loop
4700 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
4709 end Copy_Generic_Elist
;
4711 -----------------------
4712 -- Copy_Generic_List --
4713 -----------------------
4715 function Copy_Generic_List
4717 Parent_Id
: Node_Id
) return List_Id
4725 Set_Parent
(New_L
, Parent_Id
);
4728 while Present
(N
) loop
4729 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
4738 end Copy_Generic_List
;
4740 ---------------------------
4741 -- In_Defining_Unit_Name --
4742 ---------------------------
4744 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
4746 return Present
(Parent
(Nam
))
4747 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
4749 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
4750 and then In_Defining_Unit_Name
(Parent
(Nam
))));
4751 end In_Defining_Unit_Name
;
4753 -- Start of processing for Copy_Generic_Node
4760 New_N
:= New_Copy
(N
);
4762 if Instantiating
then
4763 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
4766 if not Is_List_Member
(N
) then
4767 Set_Parent
(New_N
, Parent_Id
);
4770 -- If defining identifier, then all fields have been copied already
4772 if Nkind
(New_N
) in N_Entity
then
4775 -- Special casing for identifiers and other entity names and operators
4777 elsif Nkind
(New_N
) = N_Identifier
4778 or else Nkind
(New_N
) = N_Character_Literal
4779 or else Nkind
(New_N
) = N_Expanded_Name
4780 or else Nkind
(New_N
) = N_Operator_Symbol
4781 or else Nkind
(New_N
) in N_Op
4783 if not Instantiating
then
4785 -- Link both nodes in order to assign subsequently the
4786 -- entity of the copy to the original node, in case this
4787 -- is a global reference.
4789 Set_Associated_Node
(N
, New_N
);
4791 -- If we are within an instantiation, this is a nested generic
4792 -- that has already been analyzed at the point of definition. We
4793 -- must preserve references that were global to the enclosing
4794 -- parent at that point. Other occurrences, whether global or
4795 -- local to the current generic, must be resolved anew, so we
4796 -- reset the entity in the generic copy. A global reference has
4797 -- a smaller depth than the parent, or else the same depth in
4798 -- case both are distinct compilation units.
4800 -- It is also possible for Current_Instantiated_Parent to be
4801 -- defined, and for this not to be a nested generic, namely
4802 -- if the unit is loaded through Rtsfind. In that case, the
4803 -- entity of New_N is only a link to the associated node, and
4804 -- not a defining occurrence.
4806 -- The entities for parent units in the defining_program_unit
4807 -- of a generic child unit are established when the context of
4808 -- the unit is first analyzed, before the generic copy is made.
4809 -- They are preserved in the copy for use in ASIS queries.
4811 Ent
:= Entity
(New_N
);
4813 if No
(Current_Instantiated_Parent
.Gen_Id
) then
4815 or else Nkind
(Ent
) /= N_Defining_Identifier
4816 or else not In_Defining_Unit_Name
(N
)
4818 Set_Associated_Node
(New_N
, Empty
);
4823 not (Nkind
(Ent
) = N_Defining_Identifier
4825 Nkind
(Ent
) = N_Defining_Character_Literal
4827 Nkind
(Ent
) = N_Defining_Operator_Symbol
)
4828 or else No
(Scope
(Ent
))
4829 or else Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
4830 or else (Scope_Depth
(Scope
(Ent
)) >
4831 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
4833 Get_Source_Unit
(Ent
) =
4834 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
4836 Set_Associated_Node
(New_N
, Empty
);
4839 -- Case of instantiating identifier or some other name or operator
4842 -- If the associated node is still defined, the entity in
4843 -- it is global, and must be copied to the instance.
4844 -- If this copy is being made for a body to inline, it is
4845 -- applied to an instantiated tree, and the entity is already
4846 -- present and must be also preserved.
4849 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
4851 if Present
(Assoc
) then
4852 if Nkind
(Assoc
) = Nkind
(N
) then
4853 Set_Entity
(New_N
, Entity
(Assoc
));
4854 Check_Private_View
(N
);
4856 elsif Nkind
(Assoc
) = N_Function_Call
then
4857 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
4859 elsif (Nkind
(Assoc
) = N_Defining_Identifier
4860 or else Nkind
(Assoc
) = N_Defining_Character_Literal
4861 or else Nkind
(Assoc
) = N_Defining_Operator_Symbol
)
4862 and then Expander_Active
4864 -- Inlining case: we are copying a tree that contains
4865 -- global entities, which are preserved in the copy
4866 -- to be used for subsequent inlining.
4871 Set_Entity
(New_N
, Empty
);
4877 -- For expanded name, we must copy the Prefix and Selector_Name
4879 if Nkind
(N
) = N_Expanded_Name
then
4881 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
4883 Set_Selector_Name
(New_N
,
4884 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
4886 -- For operators, we must copy the right operand
4888 elsif Nkind
(N
) in N_Op
then
4889 Set_Right_Opnd
(New_N
,
4890 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
4892 -- And for binary operators, the left operand as well
4894 if Nkind
(N
) in N_Binary_Op
then
4895 Set_Left_Opnd
(New_N
,
4896 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
4900 -- Special casing for stubs
4902 elsif Nkind
(N
) in N_Body_Stub
then
4904 -- In any case, we must copy the specification or defining
4905 -- identifier as appropriate.
4907 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4908 Set_Specification
(New_N
,
4909 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
4912 Set_Defining_Identifier
(New_N
,
4914 (Defining_Identifier
(N
), New_N
, Instantiating
));
4917 -- If we are not instantiating, then this is where we load and
4918 -- analyze subunits, i.e. at the point where the stub occurs. A
4919 -- more permissivle system might defer this analysis to the point
4920 -- of instantiation, but this seems to complicated for now.
4922 if not Instantiating
then
4924 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
4926 Unum
: Unit_Number_Type
;
4932 (Load_Name
=> Subunit_Name
,
4937 -- If the proper body is not found, a warning message will
4938 -- be emitted when analyzing the stub, or later at the the
4939 -- point of instantiation. Here we just leave the stub as is.
4941 if Unum
= No_Unit
then
4942 Subunits_Missing
:= True;
4943 goto Subunit_Not_Found
;
4946 Subunit
:= Cunit
(Unum
);
4948 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
4949 Error_Msg_Sloc
:= Sloc
(N
);
4951 ("expected SEPARATE subunit to complete stub at#,"
4952 & " found child unit", Subunit
);
4953 goto Subunit_Not_Found
;
4956 -- We must create a generic copy of the subunit, in order
4957 -- to perform semantic analysis on it, and we must replace
4958 -- the stub in the original generic unit with the subunit,
4959 -- in order to preserve non-local references within.
4961 -- Only the proper body needs to be copied. Library_Unit and
4962 -- context clause are simply inherited by the generic copy.
4963 -- Note that the copy (which may be recursive if there are
4964 -- nested subunits) must be done first, before attaching it
4965 -- to the enclosing generic.
4969 (Proper_Body
(Unit
(Subunit
)),
4970 Empty
, Instantiating
=> False);
4972 -- Now place the original proper body in the original
4973 -- generic unit. This is a body, not a compilation unit.
4975 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
4976 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
4977 Set_Was_Originally_Stub
(N
);
4979 -- Finally replace the body of the subunit with its copy,
4980 -- and make this new subunit into the library unit of the
4981 -- generic copy, which does not have stubs any longer.
4983 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
4984 Set_Library_Unit
(New_N
, Subunit
);
4985 Inherit_Context
(Unit
(Subunit
), N
);
4988 -- If we are instantiating, this must be an error case, since
4989 -- otherwise we would have replaced the stub node by the proper
4990 -- body that corresponds. So just ignore it in the copy (i.e.
4991 -- we have copied it, and that is good enough).
4997 <<Subunit_Not_Found
>> null;
4999 -- If the node is a compilation unit, it is the subunit of a stub,
5000 -- which has been loaded already (see code below). In this case,
5001 -- the library unit field of N points to the parent unit (which
5002 -- is a compilation unit) and need not (and cannot!) be copied.
5004 -- When the proper body of the stub is analyzed, thie library_unit
5005 -- link is used to establish the proper context (see sem_ch10).
5007 -- The other fields of a compilation unit are copied as usual
5009 elsif Nkind
(N
) = N_Compilation_Unit
then
5011 -- This code can only be executed when not instantiating, because
5012 -- in the copy made for an instantiation, the compilation unit
5013 -- node has disappeared at the point that a stub is replaced by
5016 pragma Assert
(not Instantiating
);
5018 Set_Context_Items
(New_N
,
5019 Copy_Generic_List
(Context_Items
(N
), New_N
));
5022 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5024 Set_First_Inlined_Subprogram
(New_N
,
5026 (First_Inlined_Subprogram
(N
), New_N
, False));
5028 Set_Aux_Decls_Node
(New_N
,
5029 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5031 -- For an assignment node, the assignment is known to be semantically
5032 -- legal if we are instantiating the template. This avoids incorrect
5033 -- diagnostics in generated code.
5035 elsif Nkind
(N
) = N_Assignment_Statement
then
5037 -- Copy name and expression fields in usual manner
5040 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5042 Set_Expression
(New_N
,
5043 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5045 if Instantiating
then
5046 Set_Assignment_OK
(Name
(New_N
), True);
5049 elsif Nkind
(N
) = N_Aggregate
5050 or else Nkind
(N
) = N_Extension_Aggregate
5053 if not Instantiating
then
5054 Set_Associated_Node
(N
, New_N
);
5057 if Present
(Get_Associated_Node
(N
))
5058 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5060 -- In the generic the aggregate has some composite type. If at
5061 -- the point of instantiation the type has a private view,
5062 -- install the full view (and that of its ancestors, if any).
5065 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5070 and then Is_Private_Type
(T
)
5076 and then Is_Tagged_Type
(T
)
5077 and then Is_Derived_Type
(T
)
5079 Rt
:= Root_Type
(T
);
5084 if Is_Private_Type
(T
) then
5095 -- Do not copy the associated node, which points to
5096 -- the generic copy of the aggregate.
5099 use Atree
.Unchecked_Access
;
5100 -- This code section is part of the implementation of an untyped
5101 -- tree traversal, so it needs direct access to node fields.
5104 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5105 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5106 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5107 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5110 -- Allocators do not have an identifier denoting the access type,
5111 -- so we must locate it through the expression to check whether
5112 -- the views are consistent.
5114 elsif Nkind
(N
) = N_Allocator
5115 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5116 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5117 and then Instantiating
5120 T
: constant Node_Id
:=
5121 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5126 -- Retrieve the allocator node in the generic copy.
5128 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5130 and then Is_Private_Type
(Acc_T
)
5132 Switch_View
(Acc_T
);
5139 -- For a proper body, we must catch the case of a proper body that
5140 -- replaces a stub. This represents the point at which a separate
5141 -- compilation unit, and hence template file, may be referenced, so
5142 -- we must make a new source instantiation entry for the template
5143 -- of the subunit, and ensure that all nodes in the subunit are
5144 -- adjusted using this new source instantiation entry.
5146 elsif Nkind
(N
) in N_Proper_Body
then
5148 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
5151 if Instantiating
and then Was_Originally_Stub
(N
) then
5152 Create_Instantiation_Source
5153 (Instantiation_Node
,
5154 Defining_Entity
(N
),
5159 -- Now copy the fields of the proper body, using the new
5160 -- adjustment factor if one was needed as per test above.
5164 -- Restore the original adjustment factor in case changed
5166 S_Adjustment
:= Save_Adjustment
;
5169 -- Don't copy Ident or Comment pragmas, since the comment belongs
5170 -- to the generic unit, not to the instantiating unit.
5172 elsif Nkind
(N
) = N_Pragma
5173 and then Instantiating
5176 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(Chars
(N
));
5179 if Prag_Id
= Pragma_Ident
5180 or else Prag_Id
= Pragma_Comment
5182 New_N
:= Make_Null_Statement
(Sloc
(N
));
5189 elsif Nkind
(N
) = N_Integer_Literal
5190 or else Nkind
(N
) = N_Real_Literal
5192 -- No descendant fields need traversing
5196 -- For the remaining nodes, copy recursively their descendants
5202 and then Nkind
(N
) = N_Subprogram_Body
5204 Set_Generic_Parent
(Specification
(New_N
), N
);
5209 end Copy_Generic_Node
;
5211 ----------------------------
5212 -- Denotes_Formal_Package --
5213 ----------------------------
5215 function Denotes_Formal_Package
5217 On_Exit
: Boolean := False) return Boolean
5220 Scop
: constant Entity_Id
:= Scope
(Pack
);
5227 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
5229 Par
:= Current_Instantiated_Parent
.Act_Id
;
5232 if Ekind
(Scop
) = E_Generic_Package
5233 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
5234 N_Generic_Subprogram_Declaration
5238 elsif Nkind
(Parent
(Pack
)) = N_Formal_Package_Declaration
then
5245 -- Check whether this package is associated with a formal
5246 -- package of the enclosing instantiation. Iterate over the
5247 -- list of renamings.
5249 E
:= First_Entity
(Par
);
5250 while Present
(E
) loop
5251 if Ekind
(E
) /= E_Package
5252 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
5255 elsif Renamed_Object
(E
) = Par
then
5258 elsif Renamed_Object
(E
) = Pack
then
5267 end Denotes_Formal_Package
;
5273 procedure End_Generic
is
5275 -- ??? More things could be factored out in this
5276 -- routine. Should probably be done at a later stage.
5278 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
5279 Generic_Flags
.Decrement_Last
;
5281 Expander_Mode_Restore
;
5284 ----------------------
5285 -- Find_Actual_Type --
5286 ----------------------
5288 function Find_Actual_Type
5290 Gen_Scope
: Entity_Id
) return Entity_Id
5295 if not Is_Child_Unit
(Gen_Scope
) then
5296 return Get_Instance_Of
(Typ
);
5298 elsif not Is_Generic_Type
(Typ
)
5299 or else Scope
(Typ
) = Gen_Scope
5301 return Get_Instance_Of
(Typ
);
5304 T
:= Current_Entity
(Typ
);
5305 while Present
(T
) loop
5306 if In_Open_Scopes
(Scope
(T
)) then
5315 end Find_Actual_Type
;
5317 ----------------------------
5318 -- Freeze_Subprogram_Body --
5319 ----------------------------
5321 procedure Freeze_Subprogram_Body
5322 (Inst_Node
: Node_Id
;
5324 Pack_Id
: Entity_Id
)
5327 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
5328 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
5333 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
5334 -- Yields True if N1 and N2 appear in the same compilation unit,
5335 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5336 -- traversal of the tree for the unit.
5338 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
5339 -- Find innermost package body that encloses the given node, and which
5340 -- is not a compilation unit. Freeze nodes for the instance, or for its
5341 -- enclosing body, may be inserted after the enclosing_body of the
5344 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
5345 -- Find entity for given package body, and locate or create a freeze
5348 function True_Parent
(N
: Node_Id
) return Node_Id
;
5349 -- For a subunit, return parent of corresponding stub.
5355 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
5361 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
5362 -- Find distance from given node to enclosing compilation unit.
5368 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
5371 and then Nkind
(P
) /= N_Compilation_Unit
5373 P
:= True_Parent
(P
);
5378 -- Start of procesing for Earlier
5381 Find_Depth
(P1
, D1
);
5382 Find_Depth
(P2
, D2
);
5392 P1
:= True_Parent
(P1
);
5397 P2
:= True_Parent
(P2
);
5401 -- At this point P1 and P2 are at the same distance from the root.
5402 -- We examine their parents until we find a common declarative
5403 -- list, at which point we can establish their relative placement
5404 -- by comparing their ultimate slocs. If we reach the root,
5405 -- N1 and N2 do not descend from the same declarative list (e.g.
5406 -- one is nested in the declarative part and the other is in a block
5407 -- in the statement part) and the earlier one is already frozen.
5409 while not Is_List_Member
(P1
)
5410 or else not Is_List_Member
(P2
)
5411 or else List_Containing
(P1
) /= List_Containing
(P2
)
5413 P1
:= True_Parent
(P1
);
5414 P2
:= True_Parent
(P2
);
5416 if Nkind
(Parent
(P1
)) = N_Subunit
then
5417 P1
:= Corresponding_Stub
(Parent
(P1
));
5420 if Nkind
(Parent
(P2
)) = N_Subunit
then
5421 P2
:= Corresponding_Stub
(Parent
(P2
));
5430 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
5433 --------------------
5434 -- Enclosing_Body --
5435 --------------------
5437 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
5438 P
: Node_Id
:= Parent
(N
);
5442 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
5444 if Nkind
(P
) = N_Package_Body
then
5446 if Nkind
(Parent
(P
)) = N_Subunit
then
5447 return Corresponding_Stub
(Parent
(P
));
5453 P
:= True_Parent
(P
);
5459 -------------------------
5460 -- Package_Freeze_Node --
5461 -------------------------
5463 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
5467 if Nkind
(B
) = N_Package_Body
then
5468 Id
:= Corresponding_Spec
(B
);
5470 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
5471 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
5474 Ensure_Freeze_Node
(Id
);
5475 return Freeze_Node
(Id
);
5476 end Package_Freeze_Node
;
5482 function True_Parent
(N
: Node_Id
) return Node_Id
is
5484 if Nkind
(Parent
(N
)) = N_Subunit
then
5485 return Parent
(Corresponding_Stub
(Parent
(N
)));
5491 -- Start of processing of Freeze_Subprogram_Body
5494 -- If the instance and the generic body appear within the same
5495 -- unit, and the instance preceeds the generic, the freeze node for
5496 -- the instance must appear after that of the generic. If the generic
5497 -- is nested within another instance I2, then current instance must
5498 -- be frozen after I2. In both cases, the freeze nodes are those of
5499 -- enclosing packages. Otherwise, the freeze node is placed at the end
5500 -- of the current declarative part.
5502 Enc_G
:= Enclosing_Body
(Gen_Body
);
5503 Enc_I
:= Enclosing_Body
(Inst_Node
);
5504 Ensure_Freeze_Node
(Pack_Id
);
5505 F_Node
:= Freeze_Node
(Pack_Id
);
5507 if Is_Generic_Instance
(Par
)
5508 and then Present
(Freeze_Node
(Par
))
5510 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
5512 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
5514 -- The parent was a premature instantiation. Insert freeze
5515 -- node at the end the current declarative part.
5517 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5520 Insert_After
(Freeze_Node
(Par
), F_Node
);
5523 -- The body enclosing the instance should be frozen after the body
5524 -- that includes the generic, because the body of the instance may
5525 -- make references to entities therein. If the two are not in the
5526 -- same declarative part, or if the one enclosing the instance is
5527 -- frozen already, freeze the instance at the end of the current
5528 -- declarative part.
5530 elsif Is_Generic_Instance
(Par
)
5531 and then Present
(Freeze_Node
(Par
))
5532 and then Present
(Enc_I
)
5534 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
5536 (Nkind
(Enc_I
) = N_Package_Body
5538 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
5540 -- The enclosing package may contain several instances. Rather
5541 -- than computing the earliest point at which to insert its
5542 -- freeze node, we place it at the end of the declarative part
5543 -- of the parent of the generic.
5545 Insert_After_Last_Decl
5546 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
5549 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5551 elsif Present
(Enc_G
)
5552 and then Present
(Enc_I
)
5553 and then Enc_G
/= Enc_I
5554 and then Earlier
(Inst_Node
, Gen_Body
)
5556 if Nkind
(Enc_G
) = N_Package_Body
then
5557 E_G_Id
:= Corresponding_Spec
(Enc_G
);
5558 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
5560 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
5563 -- Freeze package that encloses instance, and place node after
5564 -- package that encloses generic. If enclosing package is already
5565 -- frozen we have to assume it is at the proper place. This may
5566 -- be a potential ABE that requires dynamic checking.
5568 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
5570 -- Freeze enclosing subunit before instance
5572 Ensure_Freeze_Node
(E_G_Id
);
5574 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
5575 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
5578 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5581 -- If none of the above, insert freeze node at the end of the
5582 -- current declarative part.
5584 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5586 end Freeze_Subprogram_Body
;
5592 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
5594 return Generic_Renamings
.Table
(E
).Gen_Id
;
5597 ---------------------
5598 -- Get_Instance_Of --
5599 ---------------------
5601 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
5602 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
5605 if Res
/= Assoc_Null
then
5606 return Generic_Renamings
.Table
(Res
).Act_Id
;
5608 -- On exit, entity is not instantiated: not a generic parameter,
5609 -- or else parameter of an inner generic unit.
5613 end Get_Instance_Of
;
5615 ------------------------------------
5616 -- Get_Package_Instantiation_Node --
5617 ------------------------------------
5619 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
5620 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
5624 -- If the instantiation is a compilation unit that does not need a
5625 -- body then the instantiation node has been rewritten as a package
5626 -- declaration for the instance, and we return the original node.
5628 -- If it is a compilation unit and the instance node has not been
5629 -- rewritten, then it is still the unit of the compilation. Finally,
5630 -- if a body is present, this is a parent of the main unit whose body
5631 -- has been compiled for inlining purposes, and the instantiation node
5632 -- has been rewritten with the instance body.
5634 -- Otherwise the instantiation node appears after the declaration.
5635 -- If the entity is a formal package, the declaration may have been
5636 -- rewritten as a generic declaration (in the case of a formal with a
5637 -- box) or left as a formal package declaration if it has actuals, and
5638 -- is found with a forward search.
5640 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
5641 if Nkind
(Decl
) = N_Package_Declaration
5642 and then Present
(Corresponding_Body
(Decl
))
5644 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
5647 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
5648 return Original_Node
(Decl
);
5650 return Unit
(Parent
(Decl
));
5653 elsif Nkind
(Decl
) = N_Generic_Package_Declaration
5654 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
5656 return Original_Node
(Decl
);
5659 Inst
:= Next
(Decl
);
5660 while Nkind
(Inst
) /= N_Package_Instantiation
5661 and then Nkind
(Inst
) /= N_Formal_Package_Declaration
5668 end Get_Package_Instantiation_Node
;
5670 ------------------------
5671 -- Has_Been_Exchanged --
5672 ------------------------
5674 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
5675 Next
: Elmt_Id
:= First_Elmt
(Exchanged_Views
);
5678 while Present
(Next
) loop
5679 if Full_View
(Node
(Next
)) = E
then
5687 end Has_Been_Exchanged
;
5693 function Hash
(F
: Entity_Id
) return HTable_Range
is
5695 return HTable_Range
(F
mod HTable_Size
);
5698 ------------------------
5699 -- Hide_Current_Scope --
5700 ------------------------
5702 procedure Hide_Current_Scope
is
5703 C
: constant Entity_Id
:= Current_Scope
;
5707 Set_Is_Hidden_Open_Scope
(C
);
5708 E
:= First_Entity
(C
);
5710 while Present
(E
) loop
5711 if Is_Immediately_Visible
(E
) then
5712 Set_Is_Immediately_Visible
(E
, False);
5713 Append_Elmt
(E
, Hidden_Entities
);
5719 -- Make the scope name invisible as well. This is necessary, but
5720 -- might conflict with calls to Rtsfind later on, in case the scope
5721 -- is a predefined one. There is no clean solution to this problem, so
5722 -- for now we depend on the user not redefining Standard itself in one
5723 -- of the parent units.
5725 if Is_Immediately_Visible
(C
)
5726 and then C
/= Standard_Standard
5728 Set_Is_Immediately_Visible
(C
, False);
5729 Append_Elmt
(C
, Hidden_Entities
);
5732 end Hide_Current_Scope
;
5738 procedure Init_Env
is
5739 Saved
: Instance_Env
;
5742 Saved
.Ada_Version
:= Ada_Version
;
5743 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
5744 Saved
.Exchanged_Views
:= Exchanged_Views
;
5745 Saved
.Hidden_Entities
:= Hidden_Entities
;
5746 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
5747 Instance_Envs
.Increment_Last
;
5748 Instance_Envs
.Table
(Instance_Envs
.Last
) := Saved
;
5750 Exchanged_Views
:= New_Elmt_List
;
5751 Hidden_Entities
:= New_Elmt_List
;
5753 -- Make dummy entry for Instantiated parent. If generic unit is
5754 -- legal, this is set properly in Set_Instance_Env.
5756 Current_Instantiated_Parent
:=
5757 (Current_Scope
, Current_Scope
, Assoc_Null
);
5760 ------------------------------
5761 -- In_Same_Declarative_Part --
5762 ------------------------------
5764 function In_Same_Declarative_Part
5766 Inst
: Node_Id
) return Boolean
5768 Decls
: constant Node_Id
:= Parent
(F_Node
);
5769 Nod
: Node_Id
:= Parent
(Inst
);
5772 while Present
(Nod
) loop
5776 elsif Nkind
(Nod
) = N_Subprogram_Body
5777 or else Nkind
(Nod
) = N_Package_Body
5778 or else Nkind
(Nod
) = N_Task_Body
5779 or else Nkind
(Nod
) = N_Protected_Body
5780 or else Nkind
(Nod
) = N_Block_Statement
5784 elsif Nkind
(Nod
) = N_Subunit
then
5785 Nod
:= Corresponding_Stub
(Nod
);
5787 elsif Nkind
(Nod
) = N_Compilation_Unit
then
5790 Nod
:= Parent
(Nod
);
5795 end In_Same_Declarative_Part
;
5797 ---------------------
5798 -- In_Main_Context --
5799 ---------------------
5801 function In_Main_Context
(E
: Entity_Id
) return Boolean is
5807 if not Is_Compilation_Unit
(E
)
5808 or else Ekind
(E
) /= E_Package
5809 or else In_Private_Part
(E
)
5814 Context
:= Context_Items
(Cunit
(Main_Unit
));
5816 Clause
:= First
(Context
);
5817 while Present
(Clause
) loop
5818 if Nkind
(Clause
) = N_With_Clause
then
5819 Nam
:= Name
(Clause
);
5821 -- If the current scope is part of the context of the main unit,
5822 -- analysis of the corresponding with_clause is not complete, and
5823 -- the entity is not set. We use the Chars field directly, which
5824 -- might produce false positives in rare cases, but guarantees
5825 -- that we produce all the instance bodies we will need.
5827 if (Nkind
(Nam
) = N_Identifier
5828 and then Chars
(Nam
) = Chars
(E
))
5829 or else (Nkind
(Nam
) = N_Selected_Component
5830 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
5840 end In_Main_Context
;
5842 ---------------------
5843 -- Inherit_Context --
5844 ---------------------
5846 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
5847 Current_Context
: List_Id
;
5848 Current_Unit
: Node_Id
;
5853 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
5855 -- The inherited context is attached to the enclosing compilation
5856 -- unit. This is either the main unit, or the declaration for the
5857 -- main unit (in case the instantation appears within the package
5858 -- declaration and the main unit is its body).
5860 Current_Unit
:= Parent
(Inst
);
5861 while Present
(Current_Unit
)
5862 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
5864 Current_Unit
:= Parent
(Current_Unit
);
5867 Current_Context
:= Context_Items
(Current_Unit
);
5869 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
5870 while Present
(Item
) loop
5871 if Nkind
(Item
) = N_With_Clause
then
5872 New_I
:= New_Copy
(Item
);
5873 Set_Implicit_With
(New_I
, True);
5874 Append
(New_I
, Current_Context
);
5880 end Inherit_Context
;
5886 procedure Initialize
is
5888 Generic_Renamings
.Init
;
5891 Generic_Renamings_HTable
.Reset
;
5892 Circularity_Detected
:= False;
5893 Exchanged_Views
:= No_Elist
;
5894 Hidden_Entities
:= No_Elist
;
5897 ----------------------------
5898 -- Insert_After_Last_Decl --
5899 ----------------------------
5901 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
5902 L
: List_Id
:= List_Containing
(N
);
5903 P
: constant Node_Id
:= Parent
(L
);
5906 if not Is_List_Member
(F_Node
) then
5907 if Nkind
(P
) = N_Package_Specification
5908 and then L
= Visible_Declarations
(P
)
5909 and then Present
(Private_Declarations
(P
))
5910 and then not Is_Empty_List
(Private_Declarations
(P
))
5912 L
:= Private_Declarations
(P
);
5915 Insert_After
(Last
(L
), F_Node
);
5917 end Insert_After_Last_Decl
;
5923 procedure Install_Body
5924 (Act_Body
: Node_Id
;
5929 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
5930 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
5931 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
5932 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
5933 Gen_Unit
: constant Node_Id
:=
5934 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
5935 Orig_Body
: Node_Id
:= Gen_Body
;
5937 Body_Unit
: Node_Id
;
5939 Must_Delay
: Boolean;
5941 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
5942 -- Find subprogram (if any) that encloses instance and/or generic body.
5944 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
5945 -- If the instance is nested inside a generic unit, the Sloc of the
5946 -- instance indicates the place of the original definition, not the
5947 -- point of the current enclosing instance. Pending a better usage of
5948 -- Slocs to indicate instantiation places, we determine the place of
5949 -- origin of a node by finding the maximum sloc of any ancestor node.
5950 -- Why is this not equivalent fo Top_Level_Location ???
5952 --------------------
5953 -- Enclosing_Subp --
5954 --------------------
5956 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
5957 Scop
: Entity_Id
:= Scope
(Id
);
5960 while Scop
/= Standard_Standard
5961 and then not Is_Overloadable
(Scop
)
5963 Scop
:= Scope
(Scop
);
5973 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
5980 while Present
(N1
) and then N1
/= Act_Unit
loop
5981 if Sloc
(N1
) > Res
then
5991 -- Start of processing for Install_Body
5994 -- If the body is a subunit, the freeze point is the corresponding
5995 -- stub in the current compilation, not the subunit itself.
5997 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
5998 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6000 Orig_Body
:= Gen_Body
;
6003 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6005 -- If the instantiation and the generic definition appear in the
6006 -- same package declaration, this is an early instantiation.
6007 -- If they appear in the same declarative part, it is an early
6008 -- instantiation only if the generic body appears textually later,
6009 -- and the generic body is also in the main unit.
6011 -- If instance is nested within a subprogram, and the generic body is
6012 -- not, the instance is delayed because the enclosing body is. If
6013 -- instance and body are within the same scope, or the same sub-
6014 -- program body, indicate explicitly that the instance is delayed.
6017 (Gen_Unit
= Act_Unit
6018 and then ((Nkind
(Gen_Unit
) = N_Package_Declaration
)
6019 or else Nkind
(Gen_Unit
) = N_Generic_Package_Declaration
6020 or else (Gen_Unit
= Body_Unit
6021 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6022 and then Is_In_Main_Unit
(Gen_Unit
)
6023 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6025 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6027 -- If this is an early instantiation, the freeze node is placed after
6028 -- the generic body. Otherwise, if the generic appears in an instance,
6029 -- we cannot freeze the current instance until the outer one is frozen.
6030 -- This is only relevant if the current instance is nested within some
6031 -- inner scope not itself within the outer instance. If this scope is
6032 -- a package body in the same declarative part as the outer instance,
6033 -- then that body needs to be frozen after the outer instance. Finally,
6034 -- if no delay is needed, we place the freeze node at the end of the
6035 -- current declarative part.
6037 if Expander_Active
then
6038 Ensure_Freeze_Node
(Act_Id
);
6039 F_Node
:= Freeze_Node
(Act_Id
);
6042 Insert_After
(Orig_Body
, F_Node
);
6044 elsif Is_Generic_Instance
(Par
)
6045 and then Present
(Freeze_Node
(Par
))
6046 and then Scope
(Act_Id
) /= Par
6048 -- Freeze instance of inner generic after instance of enclosing
6051 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
6052 Insert_After
(Freeze_Node
(Par
), F_Node
);
6054 -- Freeze package enclosing instance of inner generic after
6055 -- instance of enclosing generic.
6057 elsif Nkind
(Parent
(N
)) = N_Package_Body
6058 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
6062 Enclosing
: constant Entity_Id
:=
6063 Corresponding_Spec
(Parent
(N
));
6066 Insert_After_Last_Decl
(N
, F_Node
);
6067 Ensure_Freeze_Node
(Enclosing
);
6069 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
6070 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
6075 Insert_After_Last_Decl
(N
, F_Node
);
6079 Insert_After_Last_Decl
(N
, F_Node
);
6083 Set_Is_Frozen
(Act_Id
);
6084 Insert_Before
(N
, Act_Body
);
6085 Mark_Rewrite_Insertion
(Act_Body
);
6088 --------------------
6089 -- Install_Parent --
6090 --------------------
6092 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
6093 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
6094 S
: constant Entity_Id
:= Current_Scope
;
6095 Inst_Par
: Entity_Id
;
6096 First_Par
: Entity_Id
;
6097 Inst_Node
: Node_Id
;
6098 Gen_Par
: Entity_Id
;
6099 First_Gen
: Entity_Id
;
6102 procedure Install_Formal_Packages
(Par
: Entity_Id
);
6103 -- If any of the formals of the parent are formal packages with box,
6104 -- their formal parts are visible in the parent and thus in the child
6105 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6106 -- for the unit itself.
6108 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
6109 -- Install the scopes of noninstance parent units ending with Par.
6111 procedure Install_Spec
(Par
: Entity_Id
);
6112 -- The child unit is within the declarative part of the parent, so
6113 -- the declarations within the parent are immediately visible.
6115 -----------------------------
6116 -- Install_Formal_Packages --
6117 -----------------------------
6119 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
6123 E
:= First_Entity
(Par
);
6125 while Present
(E
) loop
6127 if Ekind
(E
) = E_Package
6128 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6130 -- If this is the renaming for the parent instance, done.
6132 if Renamed_Object
(E
) = Par
then
6135 -- The visibility of a formal of an enclosing generic is
6138 elsif Denotes_Formal_Package
(E
) then
6141 elsif Present
(Associated_Formal_Package
(E
))
6142 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
6144 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6145 Set_Is_Hidden
(E
, False);
6151 end Install_Formal_Packages
;
6153 -------------------------------
6154 -- Install_Noninstance_Specs --
6155 -------------------------------
6157 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
6160 and then Par
/= Standard_Standard
6161 and then not In_Open_Scopes
(Par
)
6163 Install_Noninstance_Specs
(Scope
(Par
));
6166 end Install_Noninstance_Specs
;
6172 procedure Install_Spec
(Par
: Entity_Id
) is
6173 Spec
: constant Node_Id
:=
6174 Specification
(Unit_Declaration_Node
(Par
));
6178 Set_Is_Immediately_Visible
(Par
);
6179 Install_Visible_Declarations
(Par
);
6180 Install_Private_Declarations
(Par
);
6181 Set_Use
(Visible_Declarations
(Spec
));
6182 Set_Use
(Private_Declarations
(Spec
));
6185 -- Start of processing for Install_Parent
6188 -- We need to install the parent instance to compile the instantiation
6189 -- of the child, but the child instance must appear in the current
6190 -- scope. Given that we cannot place the parent above the current
6191 -- scope in the scope stack, we duplicate the current scope and unstack
6192 -- both after the instantiation is complete.
6194 -- If the parent is itself the instantiation of a child unit, we must
6195 -- also stack the instantiation of its parent, and so on. Each such
6196 -- ancestor is the prefix of the name in a prior instantiation.
6198 -- If this is a nested instance, the parent unit itself resolves to
6199 -- a renaming of the parent instance, whose declaration we need.
6201 -- Finally, the parent may be a generic (not an instance) when the
6202 -- child unit appears as a formal package.
6206 if Present
(Renamed_Entity
(Inst_Par
)) then
6207 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6210 First_Par
:= Inst_Par
;
6213 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
6215 First_Gen
:= Gen_Par
;
6217 while Present
(Gen_Par
)
6218 and then Is_Child_Unit
(Gen_Par
)
6220 -- Load grandparent instance as well
6222 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
6224 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
6225 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
6227 if Present
(Renamed_Entity
(Inst_Par
)) then
6228 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6233 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
6235 if Present
(Gen_Par
) then
6236 Prepend_Elmt
(Inst_Par
, Ancestors
);
6239 -- Parent is not the name of an instantiation
6241 Install_Noninstance_Specs
(Inst_Par
);
6253 if Present
(First_Gen
) then
6254 Append_Elmt
(First_Par
, Ancestors
);
6257 Install_Noninstance_Specs
(First_Par
);
6260 if not Is_Empty_Elmt_List
(Ancestors
) then
6261 Elmt
:= First_Elmt
(Ancestors
);
6263 while Present
(Elmt
) loop
6264 Install_Spec
(Node
(Elmt
));
6265 Install_Formal_Packages
(Node
(Elmt
));
6276 --------------------------------
6277 -- Instantiate_Formal_Package --
6278 --------------------------------
6280 function Instantiate_Formal_Package
6283 Analyzed_Formal
: Node_Id
) return List_Id
6285 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6286 Actual_Pack
: Entity_Id
;
6287 Formal_Pack
: Entity_Id
;
6288 Gen_Parent
: Entity_Id
;
6291 Parent_Spec
: Node_Id
;
6293 procedure Find_Matching_Actual
6295 Act
: in out Entity_Id
);
6296 -- We need to associate each formal entity in the formal package
6297 -- with the corresponding entity in the actual package. The actual
6298 -- package has been analyzed and possibly expanded, and as a result
6299 -- there is no one-to-one correspondence between the two lists (for
6300 -- example, the actual may include subtypes, itypes, and inherited
6301 -- primitive operations, interspersed among the renaming declarations
6302 -- for the actuals) . We retrieve the corresponding actual by name
6303 -- because each actual has the same name as the formal, and they do
6304 -- appear in the same order.
6306 function Formal_Entity
6308 Act_Ent
: Entity_Id
) return Entity_Id
;
6309 -- Returns the entity associated with the given formal F. In the
6310 -- case where F is a formal package, this function will iterate
6311 -- through all of F's formals and enter map associations from the
6312 -- actuals occurring in the formal package's corresponding actual
6313 -- package (obtained via Act_Ent) to the formal package's formal
6314 -- parameters. This function is called recursively for arbitrary
6315 -- levels of formal packages.
6317 function Is_Instance_Of
6318 (Act_Spec
: Entity_Id
;
6319 Gen_Anc
: Entity_Id
) return Boolean;
6320 -- The actual can be an instantiation of a generic within another
6321 -- instance, in which case there is no direct link from it to the
6322 -- original generic ancestor. In that case, we recognize that the
6323 -- ultimate ancestor is the same by examining names and scopes.
6325 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
6326 -- Within the generic part, entities in the formal package are
6327 -- visible. To validate subsequent type declarations, indicate
6328 -- the correspondence betwen the entities in the analyzed formal,
6329 -- and the entities in the actual package. There are three packages
6330 -- involved in the instantiation of a formal package: the parent
6331 -- generic P1 which appears in the generic declaration, the fake
6332 -- instantiation P2 which appears in the analyzed generic, and whose
6333 -- visible entities may be used in subsequent formals, and the actual
6334 -- P3 in the instance. To validate subsequent formals, me indicate
6335 -- that the entities in P2 are mapped into those of P3. The mapping of
6336 -- entities has to be done recursively for nested packages.
6338 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
6339 -- If the current formal is declared with a box, its own formals are
6340 -- visible in the instance, as they were in the generic, and their
6341 -- Hidden flag must be reset. If some of these formals are themselves
6342 -- packages declared with a box, the processing must be recursive.
6344 --------------------------
6345 -- Find_Matching_Actual --
6346 --------------------------
6348 procedure Find_Matching_Actual
6350 Act
: in out Entity_Id
)
6352 Formal_Ent
: Entity_Id
;
6355 case Nkind
(Original_Node
(F
)) is
6356 when N_Formal_Object_Declaration |
6357 N_Formal_Type_Declaration
=>
6358 Formal_Ent
:= Defining_Identifier
(F
);
6360 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6364 when N_Formal_Subprogram_Declaration |
6365 N_Formal_Package_Declaration |
6366 N_Package_Declaration |
6367 N_Generic_Package_Declaration
=>
6368 Formal_Ent
:= Defining_Entity
(F
);
6370 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6375 raise Program_Error
;
6377 end Find_Matching_Actual
;
6383 function Formal_Entity
6385 Act_Ent
: Entity_Id
) return Entity_Id
6387 Orig_Node
: Node_Id
:= F
;
6388 Act_Pkg
: Entity_Id
;
6391 case Nkind
(Original_Node
(F
)) is
6392 when N_Formal_Object_Declaration
=>
6393 return Defining_Identifier
(F
);
6395 when N_Formal_Type_Declaration
=>
6396 return Defining_Identifier
(F
);
6398 when N_Formal_Subprogram_Declaration
=>
6399 return Defining_Unit_Name
(Specification
(F
));
6401 when N_Package_Declaration
=>
6402 return Defining_Unit_Name
(Specification
(F
));
6404 when N_Formal_Package_Declaration |
6405 N_Generic_Package_Declaration
=>
6407 if Nkind
(F
) = N_Generic_Package_Declaration
then
6408 Orig_Node
:= Original_Node
(F
);
6413 -- Find matching actual package, skipping over itypes and
6414 -- other entities generated when analyzing the formal. We
6415 -- know that if the instantiation is legal then there is
6416 -- a matching package for the formal.
6418 while Ekind
(Act_Pkg
) /= E_Package
loop
6419 Act_Pkg
:= Next_Entity
(Act_Pkg
);
6423 Actual_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
6424 Formal_Node
: Node_Id
;
6425 Formal_Ent
: Entity_Id
;
6427 Gen_Decl
: constant Node_Id
:=
6428 Unit_Declaration_Node
6429 (Entity
(Name
(Orig_Node
)));
6431 Formals
: constant List_Id
:=
6432 Generic_Formal_Declarations
(Gen_Decl
);
6435 if Present
(Formals
) then
6436 Formal_Node
:= First_Non_Pragma
(Formals
);
6438 Formal_Node
:= Empty
;
6441 while Present
(Actual_Ent
)
6442 and then Present
(Formal_Node
)
6443 and then Actual_Ent
/= First_Private_Entity
(Act_Ent
)
6445 -- ??? Are the following calls also needed here:
6447 -- Set_Is_Hidden (Actual_Ent, False);
6448 -- Set_Is_Potentially_Use_Visible
6449 -- (Actual_Ent, In_Use (Act_Ent));
6451 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6452 if Present
(Formal_Ent
) then
6453 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6455 Next_Non_Pragma
(Formal_Node
);
6457 Next_Entity
(Actual_Ent
);
6461 return Defining_Identifier
(Orig_Node
);
6463 when N_Use_Package_Clause
=>
6466 when N_Use_Type_Clause
=>
6469 -- We return Empty for all other encountered forms of
6470 -- declarations because there are some cases of nonformal
6471 -- sorts of declaration that can show up (e.g., when array
6472 -- formals are present). Since it's not clear what kinds
6473 -- can appear among the formals, we won't raise failure here.
6481 --------------------
6482 -- Is_Instance_Of --
6483 --------------------
6485 function Is_Instance_Of
6486 (Act_Spec
: Entity_Id
;
6487 Gen_Anc
: Entity_Id
) return Boolean
6489 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
6492 if No
(Gen_Par
) then
6495 -- Simplest case: the generic parent of the actual is the formal.
6497 elsif Gen_Par
= Gen_Anc
then
6500 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
6503 -- The actual may be obtained through several instantiations. Its
6504 -- scope must itself be an instance of a generic declared in the
6505 -- same scope as the formal. Any other case is detected above.
6507 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
6511 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
6519 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
6524 Set_Instance_Of
(Form
, Act
);
6526 -- Traverse formal and actual package to map the corresponding
6527 -- entities. We skip over internal entities that may be generated
6528 -- during semantic analysis, and find the matching entities by
6529 -- name, given that they must appear in the same order.
6531 E1
:= First_Entity
(Form
);
6532 E2
:= First_Entity
(Act
);
6534 and then E1
/= First_Private_Entity
(Form
)
6536 if not Is_Internal
(E1
)
6537 and then not Is_Class_Wide_Type
(E1
)
6538 and then Present
(Parent
(E1
))
6541 and then Chars
(E2
) /= Chars
(E1
)
6549 Set_Instance_Of
(E1
, E2
);
6552 and then Is_Tagged_Type
(E2
)
6555 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
6558 if Ekind
(E1
) = E_Package
6559 and then No
(Renamed_Object
(E1
))
6561 Map_Entities
(E1
, E2
);
6570 ---------------------------
6571 -- Process_Nested_Formal --
6572 ---------------------------
6574 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
6578 if Present
(Associated_Formal_Package
(Formal
))
6579 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
6581 Ent
:= First_Entity
(Formal
);
6582 while Present
(Ent
) loop
6583 Set_Is_Hidden
(Ent
, False);
6584 Set_Is_Potentially_Use_Visible
6585 (Ent
, Is_Potentially_Use_Visible
(Formal
));
6587 if Ekind
(Ent
) = E_Package
then
6588 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
6589 Process_Nested_Formal
(Ent
);
6595 end Process_Nested_Formal
;
6597 -- Start of processing for Instantiate_Formal_Package
6602 if not Is_Entity_Name
(Actual
)
6603 or else Ekind
(Entity
(Actual
)) /= E_Package
6606 ("expect package instance to instantiate formal", Actual
);
6607 Abandon_Instantiation
(Actual
);
6608 raise Program_Error
;
6611 Actual_Pack
:= Entity
(Actual
);
6612 Set_Is_Instantiated
(Actual_Pack
);
6614 -- The actual may be a renamed package, or an outer generic
6615 -- formal package whose instantiation is converted into a renaming.
6617 if Present
(Renamed_Object
(Actual_Pack
)) then
6618 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
6621 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
6622 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
6623 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
6626 Generic_Parent
(Specification
(Analyzed_Formal
));
6628 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6631 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
6632 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
6634 Parent_Spec
:= Parent
(Actual_Pack
);
6637 if Gen_Parent
= Any_Id
then
6639 ("previous error in declaration of formal package", Actual
);
6640 Abandon_Instantiation
(Actual
);
6643 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
6649 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
6650 Abandon_Instantiation
(Actual
);
6653 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
6654 Map_Entities
(Formal_Pack
, Actual_Pack
);
6657 Make_Package_Renaming_Declaration
(Loc
,
6658 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
6659 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
6661 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
6662 Defining_Identifier
(Formal
));
6663 Decls
:= New_List
(Nod
);
6665 -- If the formal F has a box, then the generic declarations are
6666 -- visible in the generic G. In an instance of G, the corresponding
6667 -- entities in the actual for F (which are the actuals for the
6668 -- instantiation of the generic that F denotes) must also be made
6669 -- visible for analysis of the current instance. On exit from the
6670 -- current instance, those entities are made private again. If the
6671 -- actual is currently in use, these entities are also use-visible.
6673 -- The loop through the actual entities also steps through the
6674 -- formal entities and enters associations from formals to
6675 -- actuals into the renaming map. This is necessary to properly
6676 -- handle checking of actual parameter associations for later
6677 -- formals that depend on actuals declared in the formal package.
6679 if Box_Present
(Formal
) then
6681 Gen_Decl
: constant Node_Id
:=
6682 Unit_Declaration_Node
(Gen_Parent
);
6683 Formals
: constant List_Id
:=
6684 Generic_Formal_Declarations
(Gen_Decl
);
6685 Actual_Ent
: Entity_Id
;
6686 Formal_Node
: Node_Id
;
6687 Formal_Ent
: Entity_Id
;
6690 if Present
(Formals
) then
6691 Formal_Node
:= First_Non_Pragma
(Formals
);
6693 Formal_Node
:= Empty
;
6696 Actual_Ent
:= First_Entity
(Actual_Pack
);
6698 while Present
(Actual_Ent
)
6699 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
6701 Set_Is_Hidden
(Actual_Ent
, False);
6702 Set_Is_Potentially_Use_Visible
6703 (Actual_Ent
, In_Use
(Actual_Pack
));
6705 if Ekind
(Actual_Ent
) = E_Package
then
6706 Process_Nested_Formal
(Actual_Ent
);
6709 if Present
(Formal_Node
) then
6710 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6712 if Present
(Formal_Ent
) then
6713 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
6714 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6717 Next_Non_Pragma
(Formal_Node
);
6720 -- No further formals to match, but the generic
6721 -- part may contain inherited operation that are
6722 -- not hidden in the enclosing instance.
6724 Next_Entity
(Actual_Ent
);
6730 -- If the formal is not declared with a box, reanalyze it as
6731 -- an instantiation, to verify the matching rules of 12.7. The
6732 -- actual checks are performed after the generic associations
6737 I_Pack
: constant Entity_Id
:=
6738 Make_Defining_Identifier
(Sloc
(Actual
),
6739 Chars
=> New_Internal_Name
('P'));
6742 Set_Is_Internal
(I_Pack
);
6745 Make_Package_Instantiation
(Sloc
(Actual
),
6746 Defining_Unit_Name
=> I_Pack
,
6747 Name
=> New_Occurrence_Of
(Gen_Parent
, Sloc
(Actual
)),
6748 Generic_Associations
=>
6749 Generic_Associations
(Formal
)));
6755 end Instantiate_Formal_Package
;
6757 -----------------------------------
6758 -- Instantiate_Formal_Subprogram --
6759 -----------------------------------
6761 function Instantiate_Formal_Subprogram
6764 Analyzed_Formal
: Node_Id
) return Node_Id
6766 Loc
: Source_Ptr
:= Sloc
(Instantiation_Node
);
6767 Formal_Sub
: constant Entity_Id
:=
6768 Defining_Unit_Name
(Specification
(Formal
));
6769 Analyzed_S
: constant Entity_Id
:=
6770 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6771 Decl_Node
: Node_Id
;
6775 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
6776 -- If the generic is a child unit, the parent has been installed
6777 -- on the scope stack, but a default subprogram cannot resolve to
6778 -- something on the parent because that parent is not really part
6779 -- of the visible context (it is there to resolve explicit local
6780 -- entities). If the default has resolved in this way, we remove
6781 -- the entity from immediate visibility and analyze the node again
6782 -- to emit an error message or find another visible candidate.
6784 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
6785 -- Perform legality check and raise exception on failure.
6787 -----------------------
6788 -- From_Parent_Scope --
6789 -----------------------
6791 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
6792 Gen_Scope
: Node_Id
:= Scope
(Analyzed_S
);
6795 while Present
(Gen_Scope
)
6796 and then Is_Child_Unit
(Gen_Scope
)
6798 if Scope
(Subp
) = Scope
(Gen_Scope
) then
6802 Gen_Scope
:= Scope
(Gen_Scope
);
6806 end From_Parent_Scope
;
6808 -----------------------------
6809 -- Valid_Actual_Subprogram --
6810 -----------------------------
6812 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
6813 Act_E
: Entity_Id
:= Empty
;
6816 if Is_Entity_Name
(Act
) then
6817 Act_E
:= Entity
(Act
);
6818 elsif Nkind
(Act
) = N_Selected_Component
6819 and then Is_Entity_Name
(Selector_Name
(Act
))
6821 Act_E
:= Entity
(Selector_Name
(Act
));
6824 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
6825 or else Nkind
(Act
) = N_Attribute_Reference
6826 or else Nkind
(Act
) = N_Indexed_Component
6827 or else Nkind
(Act
) = N_Character_Literal
6828 or else Nkind
(Act
) = N_Explicit_Dereference
6834 ("expect subprogram or entry name in instantiation of&",
6835 Instantiation_Node
, Formal_Sub
);
6836 Abandon_Instantiation
(Instantiation_Node
);
6838 end Valid_Actual_Subprogram
;
6840 -- Start of processing for Instantiate_Formal_Subprogram
6843 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
6845 -- Create new entity for the actual (New_Copy_Tree does not).
6847 Set_Defining_Unit_Name
6848 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6850 -- Find entity of actual. If the actual is an attribute reference, it
6851 -- cannot be resolved here (its formal is missing) but is handled
6852 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6853 -- fully resolved subsequently, when the renaming declaration for the
6854 -- formal is analyzed. If it is an explicit dereference, resolve the
6855 -- prefix but not the actual itself, to prevent interpretation as a
6858 if Present
(Actual
) then
6859 Loc
:= Sloc
(Actual
);
6860 Set_Sloc
(New_Spec
, Loc
);
6862 if Nkind
(Actual
) = N_Operator_Symbol
then
6863 Find_Direct_Name
(Actual
);
6865 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
6866 Analyze
(Prefix
(Actual
));
6868 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
6872 Valid_Actual_Subprogram
(Actual
);
6875 elsif Present
(Default_Name
(Formal
)) then
6876 if Nkind
(Default_Name
(Formal
)) /= N_Attribute_Reference
6877 and then Nkind
(Default_Name
(Formal
)) /= N_Selected_Component
6878 and then Nkind
(Default_Name
(Formal
)) /= N_Indexed_Component
6879 and then Nkind
(Default_Name
(Formal
)) /= N_Character_Literal
6880 and then Present
(Entity
(Default_Name
(Formal
)))
6882 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
6884 Nam
:= New_Copy
(Default_Name
(Formal
));
6885 Set_Sloc
(Nam
, Loc
);
6888 elsif Box_Present
(Formal
) then
6890 -- Actual is resolved at the point of instantiation. Create
6891 -- an identifier or operator with the same name as the formal.
6893 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
6894 Nam
:= Make_Operator_Symbol
(Loc
,
6895 Chars
=> Chars
(Formal_Sub
),
6896 Strval
=> No_String
);
6898 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
6902 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
6904 ("missing actual&", Instantiation_Node
, Formal_Sub
);
6906 ("\in instantiation of & declared#",
6907 Instantiation_Node
, Scope
(Analyzed_S
));
6908 Abandon_Instantiation
(Instantiation_Node
);
6912 Make_Subprogram_Renaming_Declaration
(Loc
,
6913 Specification
=> New_Spec
,
6916 -- If we do not have an actual and the formal specified <> then
6917 -- set to get proper default.
6919 if No
(Actual
) and then Box_Present
(Formal
) then
6920 Set_From_Default
(Decl_Node
);
6923 -- Gather possible interpretations for the actual before analyzing the
6924 -- instance. If overloaded, it will be resolved when analyzing the
6925 -- renaming declaration.
6927 if Box_Present
(Formal
)
6928 and then No
(Actual
)
6932 if Is_Child_Unit
(Scope
(Analyzed_S
))
6933 and then Present
(Entity
(Nam
))
6935 if not Is_Overloaded
(Nam
) then
6937 if From_Parent_Scope
(Entity
(Nam
)) then
6938 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
6939 Set_Entity
(Nam
, Empty
);
6940 Set_Etype
(Nam
, Empty
);
6944 Set_Is_Immediately_Visible
(Entity
(Nam
));
6953 Get_First_Interp
(Nam
, I
, It
);
6955 while Present
(It
.Nam
) loop
6956 if From_Parent_Scope
(It
.Nam
) then
6960 Get_Next_Interp
(I
, It
);
6967 -- The generic instantiation freezes the actual. This can only be
6968 -- done once the actual is resolved, in the analysis of the renaming
6969 -- declaration. To indicate that must be done, we set the corresponding
6970 -- spec of the node to point to the formal subprogram entity.
6972 Set_Corresponding_Spec
(Decl_Node
, Analyzed_S
);
6974 -- We cannot analyze the renaming declaration, and thus find the
6975 -- actual, until the all the actuals are assembled in the instance.
6976 -- For subsequent checks of other actuals, indicate the node that
6977 -- will hold the instance of this formal.
6979 Set_Instance_Of
(Analyzed_S
, Nam
);
6981 if Nkind
(Actual
) = N_Selected_Component
6982 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
6983 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
6985 -- The renaming declaration will create a body, which must appear
6986 -- outside of the instantiation, We move the renaming declaration
6987 -- out of the instance, and create an additional renaming inside,
6988 -- to prevent freezing anomalies.
6991 Anon_Id
: constant Entity_Id
:=
6992 Make_Defining_Identifier
6993 (Loc
, New_Internal_Name
('E'));
6995 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
6996 Insert_Before
(Instantiation_Node
, Decl_Node
);
6997 Analyze
(Decl_Node
);
6999 -- Now create renaming within the instance
7002 Make_Subprogram_Renaming_Declaration
(Loc
,
7003 Specification
=> New_Copy_Tree
(New_Spec
),
7004 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7006 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
7007 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7012 end Instantiate_Formal_Subprogram
;
7014 ------------------------
7015 -- Instantiate_Object --
7016 ------------------------
7018 function Instantiate_Object
7021 Analyzed_Formal
: Node_Id
) return List_Id
7023 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7024 Type_Id
: constant Node_Id
:= Subtype_Mark
(Formal
);
7025 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7026 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
7027 Orig_Ftyp
: constant Entity_Id
:=
7028 Etype
(Defining_Identifier
(Analyzed_Formal
));
7029 List
: constant List_Id
:= New_List
;
7031 Decl_Node
: Node_Id
;
7032 Subt_Decl
: Node_Id
:= Empty
;
7035 -- Sloc for error message on missing actual.
7036 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
7038 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
7039 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
7042 Set_Parent
(List
, Parent
(Actual
));
7046 if Out_Present
(Formal
) then
7048 -- An IN OUT generic actual must be a name. The instantiation is
7049 -- a renaming declaration. The actual is the name being renamed.
7050 -- We use the actual directly, rather than a copy, because it is not
7051 -- used further in the list of actuals, and because a copy or a use
7052 -- of relocate_node is incorrect if the instance is nested within
7053 -- a generic. In order to simplify ASIS searches, the Generic_Parent
7054 -- field links the declaration to the generic association.
7059 Instantiation_Node
, Formal_Id
);
7061 ("\in instantiation of & declared#",
7063 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7064 Abandon_Instantiation
(Instantiation_Node
);
7068 Make_Object_Renaming_Declaration
(Loc
,
7069 Defining_Identifier
=> New_Copy
(Formal_Id
),
7070 Subtype_Mark
=> New_Copy_Tree
(Type_Id
),
7073 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7075 -- The analysis of the actual may produce insert_action nodes, so
7076 -- the declaration must have a context in which to attach them.
7078 Append
(Decl_Node
, List
);
7081 -- This check is performed here because Analyze_Object_Renaming
7082 -- will not check it when Comes_From_Source is False. Note
7083 -- though that the check for the actual being the name of an
7084 -- object will be performed in Analyze_Object_Renaming.
7086 if Is_Object_Reference
(Actual
)
7087 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
7090 ("illegal discriminant-dependent component for in out parameter",
7094 -- The actual has to be resolved in order to check that it is
7095 -- a variable (due to cases such as F(1), where F returns
7096 -- access to an array, and for overloaded prefixes).
7099 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
7101 if Is_Private_Type
(Ftyp
)
7102 and then not Is_Private_Type
(Etype
(Actual
))
7103 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
7104 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
7106 -- If the actual has the type of the full view of the formal,
7107 -- or else a non-private subtype of the formal, then
7108 -- the visibility of the formal type has changed. Add to the
7109 -- actuals a subtype declaration that will force the exchange
7110 -- of views in the body of the instance as well.
7113 Make_Subtype_Declaration
(Loc
,
7114 Defining_Identifier
=>
7115 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
7116 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
7118 Prepend
(Subt_Decl
, List
);
7120 Append_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
7121 Exchange_Declarations
(Ftyp
);
7124 Resolve
(Actual
, Ftyp
);
7126 if not Is_Variable
(Actual
) or else Paren_Count
(Actual
) > 0 then
7128 ("actual for& must be a variable", Actual
, Formal_Id
);
7130 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
7132 "type of actual does not match type of&", Actual
, Formal_Id
);
7136 Note_Possible_Modification
(Actual
);
7138 -- Check for instantiation of atomic/volatile actual for
7139 -- non-atomic/volatile formal (RM C.6 (12)).
7141 if Is_Atomic_Object
(Actual
)
7142 and then not Is_Atomic
(Orig_Ftyp
)
7145 ("cannot instantiate non-atomic formal object " &
7146 "with atomic actual", Actual
);
7148 elsif Is_Volatile_Object
(Actual
)
7149 and then not Is_Volatile
(Orig_Ftyp
)
7152 ("cannot instantiate non-volatile formal object " &
7153 "with volatile actual", Actual
);
7159 -- The instantiation of a generic formal in-parameter
7160 -- is a constant declaration. The actual is the expression for
7161 -- that declaration.
7163 if Present
(Actual
) then
7165 Decl_Node
:= Make_Object_Declaration
(Loc
,
7166 Defining_Identifier
=> New_Copy
(Formal_Id
),
7167 Constant_Present
=> True,
7168 Object_Definition
=> New_Copy_Tree
(Type_Id
),
7169 Expression
=> Actual
);
7171 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7173 -- A generic formal object of a tagged type is defined
7174 -- to be aliased so the new constant must also be treated
7178 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7180 Set_Aliased_Present
(Decl_Node
);
7183 Append
(Decl_Node
, List
);
7185 -- No need to repeat (pre-)analysis of some expression nodes
7186 -- already handled in Pre_Analyze_Actuals.
7188 if Nkind
(Actual
) /= N_Allocator
then
7193 Typ
: constant Entity_Id
:=
7195 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
7198 Freeze_Before
(Instantiation_Node
, Typ
);
7200 -- If the actual is an aggregate, perform name resolution
7201 -- on its components (the analysis of an aggregate does not
7202 -- do it) to capture local names that may be hidden if the
7203 -- generic is a child unit.
7205 if Nkind
(Actual
) = N_Aggregate
then
7206 Pre_Analyze_And_Resolve
(Actual
, Typ
);
7210 elsif Present
(Expression
(Formal
)) then
7212 -- Use default to construct declaration.
7215 Make_Object_Declaration
(Sloc
(Formal
),
7216 Defining_Identifier
=> New_Copy
(Formal_Id
),
7217 Constant_Present
=> True,
7218 Object_Definition
=> New_Copy
(Type_Id
),
7219 Expression
=> New_Copy_Tree
(Expression
(Formal
)));
7221 Append
(Decl_Node
, List
);
7222 Set_Analyzed
(Expression
(Decl_Node
), False);
7227 Instantiation_Node
, Formal_Id
);
7228 Error_Msg_NE
("\in instantiation of & declared#",
7230 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7233 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7235 -- Create dummy constant declaration so that instance can
7236 -- be analyzed, to minimize cascaded visibility errors.
7239 Make_Object_Declaration
(Loc
,
7240 Defining_Identifier
=> New_Copy
(Formal_Id
),
7241 Constant_Present
=> True,
7242 Object_Definition
=> New_Copy
(Type_Id
),
7244 Make_Attribute_Reference
(Sloc
(Formal_Id
),
7245 Attribute_Name
=> Name_First
,
7246 Prefix
=> New_Copy
(Type_Id
)));
7248 Append
(Decl_Node
, List
);
7251 Abandon_Instantiation
(Instantiation_Node
);
7258 end Instantiate_Object
;
7260 ------------------------------
7261 -- Instantiate_Package_Body --
7262 ------------------------------
7264 procedure Instantiate_Package_Body
7265 (Body_Info
: Pending_Body_Info
;
7266 Inlined_Body
: Boolean := False)
7268 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7269 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7270 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7272 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7273 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7274 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7275 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
7276 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
7278 Act_Body_Name
: Node_Id
;
7280 Gen_Body_Id
: Node_Id
;
7282 Act_Body_Id
: Entity_Id
;
7284 Parent_Installed
: Boolean := False;
7285 Save_Style_Check
: constant Boolean := Style_Check
;
7288 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7290 -- The instance body may already have been processed, as the parent
7291 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7293 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
7297 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7299 if No
(Gen_Body_Id
) then
7300 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7301 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7304 -- Establish global variable for sloc adjustment and for error
7307 Instantiation_Node
:= Inst_Node
;
7309 if Present
(Gen_Body_Id
) then
7310 Save_Env
(Gen_Unit
, Act_Decl_Id
);
7311 Style_Check
:= False;
7312 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7314 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7316 Create_Instantiation_Source
7317 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
7321 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7323 -- Build new name (possibly qualified) for body declaration
7325 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
7327 -- Some attributes of the spec entity are not inherited by the
7330 Set_Handler_Records
(Act_Body_Id
, No_List
);
7332 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7333 N_Defining_Program_Unit_Name
7336 Make_Defining_Program_Unit_Name
(Loc
,
7337 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
7338 Defining_Identifier
=> Act_Body_Id
);
7340 Act_Body_Name
:= Act_Body_Id
;
7343 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
7345 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
7346 Check_Generic_Actuals
(Act_Decl_Id
, False);
7348 -- If it is a child unit, make the parent instance (which is an
7349 -- instance of the parent of the generic) visible. The parent
7350 -- instance is the prefix of the name of the generic unit.
7352 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7353 and then Nkind
(Gen_Id
) = N_Expanded_Name
7355 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7356 Parent_Installed
:= True;
7358 elsif Is_Child_Unit
(Gen_Unit
) then
7359 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7360 Parent_Installed
:= True;
7363 -- If the instantiation is a library unit, and this is the main
7364 -- unit, then build the resulting compilation unit nodes for the
7365 -- instance. If this is a compilation unit but it is not the main
7366 -- unit, then it is the body of a unit in the context, that is being
7367 -- compiled because it is encloses some inlined unit or another
7368 -- generic unit being instantiated. In that case, this body is not
7369 -- part of the current compilation, and is not attached to the tree,
7370 -- but its parent must be set for analysis.
7372 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7374 -- Replace instance node with body of instance, and create
7375 -- new node for corresponding instance declaration.
7377 Build_Instance_Compilation_Unit_Nodes
7378 (Inst_Node
, Act_Body
, Act_Decl
);
7379 Analyze
(Inst_Node
);
7381 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7383 -- If the instance is a child unit itself, then set the
7384 -- scope of the expanded body to be the parent of the
7385 -- instantiation (ensuring that the fully qualified name
7386 -- will be generated for the elaboration subprogram).
7388 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7389 N_Defining_Program_Unit_Name
7392 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
7396 -- Case where instantiation is not a library unit
7399 -- If this is an early instantiation, i.e. appears textually
7400 -- before the corresponding body and must be elaborated first,
7401 -- indicate that the body instance is to be delayed.
7403 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
7405 -- Now analyze the body. We turn off all checks if this is
7406 -- an internal unit, since there is no reason to have checks
7407 -- on for any predefined run-time library code. All such
7408 -- code is designed to be compiled with checks off.
7410 -- Note that we do NOT apply this criterion to children of
7411 -- GNAT (or on VMS, children of DEC). The latter units must
7412 -- suppress checks explicitly if this is needed.
7414 if Is_Predefined_File_Name
7415 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
7417 Analyze
(Act_Body
, Suppress
=> All_Checks
);
7423 if not Generic_Separately_Compiled
(Gen_Unit
) then
7424 Inherit_Context
(Gen_Body
, Inst_Node
);
7427 -- Remove the parent instances if they have been placed on the
7428 -- scope stack to compile the body.
7430 if Parent_Installed
then
7431 Remove_Parent
(In_Body
=> True);
7434 Restore_Private_Views
(Act_Decl_Id
);
7436 -- Remove the current unit from visibility if this is an instance
7437 -- that is not elaborated on the fly for inlining purposes.
7439 if not Inlined_Body
then
7440 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
7444 Style_Check
:= Save_Style_Check
;
7446 -- If we have no body, and the unit requires a body, then complain.
7447 -- This complaint is suppressed if we have detected other errors
7448 -- (since a common reason for missing the body is that it had errors).
7450 elsif Unit_Requires_Body
(Gen_Unit
) then
7451 if Serious_Errors_Detected
= 0 then
7453 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
7455 -- Don't attempt to perform any cleanup actions if some other
7456 -- error was aready detected, since this can cause blowups.
7462 -- Case of package that does not need a body
7465 -- If the instantiation of the declaration is a library unit,
7466 -- rewrite the original package instantiation as a package
7467 -- declaration in the compilation unit node.
7469 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7470 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
7471 Rewrite
(Inst_Node
, Act_Decl
);
7473 -- Generate elaboration entity, in case spec has elaboration
7474 -- code. This cannot be done when the instance is analyzed,
7475 -- because it is not known yet whether the body exists.
7477 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
7478 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
7480 -- If the instantiation is not a library unit, then append the
7481 -- declaration to the list of implicitly generated entities.
7482 -- unless it is already a list member which means that it was
7483 -- already processed
7485 elsif not Is_List_Member
(Act_Decl
) then
7486 Mark_Rewrite_Insertion
(Act_Decl
);
7487 Insert_Before
(Inst_Node
, Act_Decl
);
7491 Expander_Mode_Restore
;
7492 end Instantiate_Package_Body
;
7494 ---------------------------------
7495 -- Instantiate_Subprogram_Body --
7496 ---------------------------------
7498 procedure Instantiate_Subprogram_Body
7499 (Body_Info
: Pending_Body_Info
)
7501 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7502 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7503 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7504 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7505 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7506 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7507 Anon_Id
: constant Entity_Id
:=
7508 Defining_Unit_Name
(Specification
(Act_Decl
));
7509 Pack_Id
: constant Entity_Id
:=
7510 Defining_Unit_Name
(Parent
(Act_Decl
));
7513 Gen_Body_Id
: Node_Id
;
7515 Act_Body_Id
: Entity_Id
;
7516 Pack_Body
: Node_Id
;
7517 Prev_Formal
: Entity_Id
;
7519 Unit_Renaming
: Node_Id
;
7521 Parent_Installed
: Boolean := False;
7522 Save_Style_Check
: constant Boolean := Style_Check
;
7525 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7527 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7529 if No
(Gen_Body_Id
) then
7530 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7531 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7534 Instantiation_Node
:= Inst_Node
;
7536 if Present
(Gen_Body_Id
) then
7537 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7539 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
7541 -- Either body is not present, or context is non-expanding, as
7542 -- when compiling a subunit. Mark the instance as completed, and
7543 -- diagnose a missing body when needed.
7546 and then Operating_Mode
= Generate_Code
7549 ("missing proper body for instantiation", Gen_Body
);
7552 Set_Has_Completion
(Anon_Id
);
7556 Save_Env
(Gen_Unit
, Anon_Id
);
7557 Style_Check
:= False;
7558 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7559 Create_Instantiation_Source
7567 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7568 Act_Body_Id
:= Defining_Entity
(Act_Body
);
7569 Set_Chars
(Act_Body_Id
, Chars
(Anon_Id
));
7570 Set_Sloc
(Act_Body_Id
, Sloc
(Defining_Entity
(Inst_Node
)));
7571 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
7572 Set_Has_Completion
(Anon_Id
);
7573 Check_Generic_Actuals
(Pack_Id
, False);
7575 -- If it is a child unit, make the parent instance (which is an
7576 -- instance of the parent of the generic) visible. The parent
7577 -- instance is the prefix of the name of the generic unit.
7579 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7580 and then Nkind
(Gen_Id
) = N_Expanded_Name
7582 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7583 Parent_Installed
:= True;
7585 elsif Is_Child_Unit
(Gen_Unit
) then
7586 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7587 Parent_Installed
:= True;
7590 -- Inside its body, a reference to the generic unit is a reference
7591 -- to the instance. The corresponding renaming is the first
7592 -- declaration in the body.
7595 Make_Subprogram_Renaming_Declaration
(Loc
,
7598 Specification
(Original_Node
(Gen_Body
)),
7600 Instantiating
=> True),
7601 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7603 -- If there is a formal subprogram with the same name as the
7604 -- unit itself, do not add this renaming declaration. This is
7605 -- a temporary fix for one ACVC test. ???
7607 Prev_Formal
:= First_Entity
(Pack_Id
);
7608 while Present
(Prev_Formal
) loop
7609 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
7610 and then Is_Overloadable
(Prev_Formal
)
7615 Next_Entity
(Prev_Formal
);
7618 if Present
(Prev_Formal
) then
7619 Decls
:= New_List
(Act_Body
);
7621 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
7624 -- The subprogram body is placed in the body of a dummy package
7625 -- body, whose spec contains the subprogram declaration as well
7626 -- as the renaming declarations for the generic parameters.
7628 Pack_Body
:= Make_Package_Body
(Loc
,
7629 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7630 Declarations
=> Decls
);
7632 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7634 -- If the instantiation is a library unit, then build resulting
7635 -- compilation unit nodes for the instance. The declaration of
7636 -- the enclosing package is the grandparent of the subprogram
7637 -- declaration. First replace the instantiation node as the unit
7638 -- of the corresponding compilation.
7640 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7641 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7642 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
7643 Build_Instance_Compilation_Unit_Nodes
7644 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
7645 Analyze
(Inst_Node
);
7647 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
7648 Analyze
(Pack_Body
);
7652 Insert_Before
(Inst_Node
, Pack_Body
);
7653 Mark_Rewrite_Insertion
(Pack_Body
);
7654 Analyze
(Pack_Body
);
7656 if Expander_Active
then
7657 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
7661 if not Generic_Separately_Compiled
(Gen_Unit
) then
7662 Inherit_Context
(Gen_Body
, Inst_Node
);
7665 Restore_Private_Views
(Pack_Id
, False);
7667 if Parent_Installed
then
7668 Remove_Parent
(In_Body
=> True);
7672 Style_Check
:= Save_Style_Check
;
7674 -- Body not found. Error was emitted already. If there were no
7675 -- previous errors, this may be an instance whose scope is a premature
7676 -- instance. In that case we must insure that the (legal) program does
7677 -- raise program error if executed. We generate a subprogram body for
7678 -- this purpose. See DEC ac30vso.
7680 elsif Serious_Errors_Detected
= 0
7681 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
7683 if Ekind
(Anon_Id
) = E_Procedure
then
7685 Make_Subprogram_Body
(Loc
,
7687 Make_Procedure_Specification
(Loc
,
7688 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7689 Parameter_Specifications
=>
7691 (Parameter_Specifications
(Parent
(Anon_Id
)))),
7693 Declarations
=> Empty_List
,
7694 Handled_Statement_Sequence
=>
7695 Make_Handled_Sequence_Of_Statements
(Loc
,
7698 Make_Raise_Program_Error
(Loc
,
7700 PE_Access_Before_Elaboration
))));
7704 Make_Raise_Program_Error
(Loc
,
7705 Reason
=> PE_Access_Before_Elaboration
);
7707 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
7708 Set_Analyzed
(Ret_Expr
);
7711 Make_Subprogram_Body
(Loc
,
7713 Make_Function_Specification
(Loc
,
7714 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7715 Parameter_Specifications
=>
7717 (Parameter_Specifications
(Parent
(Anon_Id
))),
7719 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
7721 Declarations
=> Empty_List
,
7722 Handled_Statement_Sequence
=>
7723 Make_Handled_Sequence_Of_Statements
(Loc
,
7725 New_List
(Make_Return_Statement
(Loc
, Ret_Expr
))));
7728 Pack_Body
:= Make_Package_Body
(Loc
,
7729 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7730 Declarations
=> New_List
(Act_Body
));
7732 Insert_After
(Inst_Node
, Pack_Body
);
7733 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7734 Analyze
(Pack_Body
);
7737 Expander_Mode_Restore
;
7738 end Instantiate_Subprogram_Body
;
7740 ----------------------
7741 -- Instantiate_Type --
7742 ----------------------
7744 function Instantiate_Type
7747 Analyzed_Formal
: Node_Id
;
7748 Actual_Decls
: List_Id
) return Node_Id
7750 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7751 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7752 A_Gen_T
: constant Entity_Id
:= Defining_Identifier
(Analyzed_Formal
);
7753 Ancestor
: Entity_Id
:= Empty
;
7754 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
7756 Decl_Node
: Node_Id
;
7758 procedure Validate_Array_Type_Instance
;
7759 procedure Validate_Access_Subprogram_Instance
;
7760 procedure Validate_Access_Type_Instance
;
7761 procedure Validate_Derived_Type_Instance
;
7762 procedure Validate_Private_Type_Instance
;
7763 -- These procedures perform validation tests for the named case
7765 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
7766 -- Check that base types are the same and that the subtypes match
7767 -- statically. Used in several of the above.
7769 --------------------
7770 -- Subtypes_Match --
7771 --------------------
7773 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
7774 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
7777 return (Base_Type
(T
) = Base_Type
(Act_T
)
7778 -- why is the and then commented out here???
7779 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7780 and then Subtypes_Statically_Match
(T
, Act_T
))
7782 or else (Is_Class_Wide_Type
(Gen_T
)
7783 and then Is_Class_Wide_Type
(Act_T
)
7786 Get_Instance_Of
(Root_Type
(Gen_T
)),
7787 Root_Type
(Act_T
)));
7790 -----------------------------------------
7791 -- Validate_Access_Subprogram_Instance --
7792 -----------------------------------------
7794 procedure Validate_Access_Subprogram_Instance
is
7796 if not Is_Access_Type
(Act_T
)
7797 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
7800 ("expect access type in instantiation of &", Actual
, Gen_T
);
7801 Abandon_Instantiation
(Actual
);
7804 Check_Mode_Conformant
7805 (Designated_Type
(Act_T
),
7806 Designated_Type
(A_Gen_T
),
7810 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
7811 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
7813 ("protected access type not allowed for formal &",
7817 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
7819 ("expect protected access type for formal &",
7822 end Validate_Access_Subprogram_Instance
;
7824 -----------------------------------
7825 -- Validate_Access_Type_Instance --
7826 -----------------------------------
7828 procedure Validate_Access_Type_Instance
is
7829 Desig_Type
: constant Entity_Id
:=
7831 (Designated_Type
(A_Gen_T
), Scope
(A_Gen_T
));
7834 if not Is_Access_Type
(Act_T
) then
7836 ("expect access type in instantiation of &", Actual
, Gen_T
);
7837 Abandon_Instantiation
(Actual
);
7840 if Is_Access_Constant
(A_Gen_T
) then
7841 if not Is_Access_Constant
(Act_T
) then
7843 ("actual type must be access-to-constant type", Actual
);
7844 Abandon_Instantiation
(Actual
);
7847 if Is_Access_Constant
(Act_T
) then
7849 ("actual type must be access-to-variable type", Actual
);
7850 Abandon_Instantiation
(Actual
);
7852 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
7853 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
7855 Error_Msg_N
("actual must be general access type!", Actual
);
7856 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
7857 Abandon_Instantiation
(Actual
);
7861 -- The designated subtypes, that is to say the subtypes introduced
7862 -- by an access type declaration (and not by a subtype declaration)
7865 if not Subtypes_Match
7866 (Desig_Type
, Designated_Type
(Base_Type
(Act_T
)))
7869 ("designated type of actual does not match that of formal &",
7871 Abandon_Instantiation
(Actual
);
7873 elsif Is_Access_Type
(Designated_Type
(Act_T
))
7874 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
7876 Is_Constrained
(Designated_Type
(Desig_Type
))
7879 ("designated type of actual does not match that of formal &",
7881 Abandon_Instantiation
(Actual
);
7883 end Validate_Access_Type_Instance
;
7885 ----------------------------------
7886 -- Validate_Array_Type_Instance --
7887 ----------------------------------
7889 procedure Validate_Array_Type_Instance
is
7894 function Formal_Dimensions
return Int
;
7895 -- Count number of dimensions in array type formal
7897 -----------------------
7898 -- Formal_Dimensions --
7899 -----------------------
7901 function Formal_Dimensions
return Int
is
7906 if Nkind
(Def
) = N_Constrained_Array_Definition
then
7907 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
7909 Index
:= First
(Subtype_Marks
(Def
));
7912 while Present
(Index
) loop
7918 end Formal_Dimensions
;
7920 -- Start of processing for Validate_Array_Type_Instance
7923 if not Is_Array_Type
(Act_T
) then
7925 ("expect array type in instantiation of &", Actual
, Gen_T
);
7926 Abandon_Instantiation
(Actual
);
7928 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
7929 if not (Is_Constrained
(Act_T
)) then
7931 ("expect constrained array in instantiation of &",
7933 Abandon_Instantiation
(Actual
);
7937 if Is_Constrained
(Act_T
) then
7939 ("expect unconstrained array in instantiation of &",
7941 Abandon_Instantiation
(Actual
);
7945 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
7947 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
7948 Abandon_Instantiation
(Actual
);
7951 I1
:= First_Index
(A_Gen_T
);
7952 I2
:= First_Index
(Act_T
);
7953 for J
in 1 .. Formal_Dimensions
loop
7955 -- If the indices of the actual were given by a subtype_mark,
7956 -- the index was transformed into a range attribute. Retrieve
7957 -- the original type mark for checking.
7959 if Is_Entity_Name
(Original_Node
(I2
)) then
7960 T2
:= Entity
(Original_Node
(I2
));
7965 if not Subtypes_Match
7966 (Find_Actual_Type
(Etype
(I1
), Scope
(A_Gen_T
)), T2
)
7969 ("index types of actual do not match those of formal &",
7971 Abandon_Instantiation
(Actual
);
7978 if not Subtypes_Match
(
7979 Find_Actual_Type
(Component_Type
(A_Gen_T
), Scope
(A_Gen_T
)),
7980 Component_Type
(Act_T
))
7983 ("component subtype of actual does not match that of formal &",
7985 Abandon_Instantiation
(Actual
);
7988 if Has_Aliased_Components
(A_Gen_T
)
7989 and then not Has_Aliased_Components
(Act_T
)
7992 ("actual must have aliased components to match formal type &",
7996 end Validate_Array_Type_Instance
;
7998 ------------------------------------
7999 -- Validate_Derived_Type_Instance --
8000 ------------------------------------
8002 procedure Validate_Derived_Type_Instance
is
8003 Actual_Discr
: Entity_Id
;
8004 Ancestor_Discr
: Entity_Id
;
8007 -- If the parent type in the generic declaration is itself
8008 -- a previous formal type, then it is local to the generic
8009 -- and absent from the analyzed generic definition. In that
8010 -- case the ancestor is the instance of the formal (which must
8011 -- have been instantiated previously), unless the ancestor is
8012 -- itself a formal derived type. In this latter case (which is the
8013 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8014 -- formals is the ancestor of its parent. Otherwise, the analyzed
8015 -- generic carries the parent type. If the parent type is defined
8016 -- in a previous formal package, then the scope of that formal
8017 -- package is that of the generic type itself, and it has already
8018 -- been mapped into the corresponding type in the actual package.
8020 -- Common case: parent type defined outside of the generic
8022 if Is_Entity_Name
(Subtype_Mark
(Def
))
8023 and then Present
(Entity
(Subtype_Mark
(Def
)))
8025 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
8027 -- Check whether parent is defined in a previous formal package
8030 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
8033 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
8035 -- The type may be a local derivation, or a type extension of
8036 -- a previous formal, or of a formal of a parent package.
8038 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
8040 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
8042 -- Check whether the parent is another derived formal type
8043 -- in the same generic unit.
8045 if Etype
(A_Gen_T
) /= A_Gen_T
8046 and then Is_Generic_Type
(Etype
(A_Gen_T
))
8047 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
8048 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
8050 -- Locate ancestor of parent from the subtype declaration
8051 -- created for the actual.
8057 Decl
:= First
(Actual_Decls
);
8058 while Present
(Decl
) loop
8059 if Nkind
(Decl
) = N_Subtype_Declaration
8060 and then Chars
(Defining_Identifier
(Decl
)) =
8061 Chars
(Etype
(A_Gen_T
))
8063 Ancestor
:= Generic_Parent_Type
(Decl
);
8071 pragma Assert
(Present
(Ancestor
));
8075 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
8079 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
8082 if not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
8084 ("expect type derived from & in instantiation",
8085 Actual
, First_Subtype
(Ancestor
));
8086 Abandon_Instantiation
(Actual
);
8089 -- Perform atomic/volatile checks (RM C.6(12))
8091 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
8093 ("cannot have atomic actual type for non-atomic formal type",
8096 elsif Is_Volatile
(Act_T
)
8097 and then not Is_Volatile
(Ancestor
)
8098 and then Is_By_Reference_Type
(Ancestor
)
8101 ("cannot have volatile actual type for non-volatile formal type",
8105 -- It should not be necessary to check for unknown discriminants
8106 -- on Formal, but for some reason Has_Unknown_Discriminants is
8107 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8108 -- returns False. This needs fixing. ???
8110 if not Is_Indefinite_Subtype
(A_Gen_T
)
8111 and then not Unknown_Discriminants_Present
(Formal
)
8112 and then Is_Indefinite_Subtype
(Act_T
)
8115 ("actual subtype must be constrained", Actual
);
8116 Abandon_Instantiation
(Actual
);
8119 if not Unknown_Discriminants_Present
(Formal
) then
8120 if Is_Constrained
(Ancestor
) then
8121 if not Is_Constrained
(Act_T
) then
8123 ("actual subtype must be constrained", Actual
);
8124 Abandon_Instantiation
(Actual
);
8127 -- Ancestor is unconstrained
8129 elsif Is_Constrained
(Act_T
) then
8130 if Ekind
(Ancestor
) = E_Access_Type
8131 or else Is_Composite_Type
(Ancestor
)
8134 ("actual subtype must be unconstrained", Actual
);
8135 Abandon_Instantiation
(Actual
);
8138 -- A class-wide type is only allowed if the formal has
8139 -- unknown discriminants.
8141 elsif Is_Class_Wide_Type
(Act_T
)
8142 and then not Has_Unknown_Discriminants
(Ancestor
)
8145 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
8146 Abandon_Instantiation
(Actual
);
8148 -- Otherwise, the formal and actual shall have the same
8149 -- number of discriminants and each discriminant of the
8150 -- actual must correspond to a discriminant of the formal.
8152 elsif Has_Discriminants
(Act_T
)
8153 and then not Has_Unknown_Discriminants
(Act_T
)
8154 and then Has_Discriminants
(Ancestor
)
8156 Actual_Discr
:= First_Discriminant
(Act_T
);
8157 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
8158 while Present
(Actual_Discr
)
8159 and then Present
(Ancestor_Discr
)
8161 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
8162 not Present
(Corresponding_Discriminant
(Actual_Discr
))
8165 ("discriminant & does not correspond " &
8166 "to ancestor discriminant", Actual
, Actual_Discr
);
8167 Abandon_Instantiation
(Actual
);
8170 Next_Discriminant
(Actual_Discr
);
8171 Next_Discriminant
(Ancestor_Discr
);
8174 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
8176 ("actual for & must have same number of discriminants",
8178 Abandon_Instantiation
(Actual
);
8181 -- This case should be caught by the earlier check for
8182 -- for constrainedness, but the check here is added for
8185 elsif Has_Discriminants
(Act_T
)
8186 and then not Has_Unknown_Discriminants
(Act_T
)
8189 ("actual for & must not have discriminants", Actual
, Gen_T
);
8190 Abandon_Instantiation
(Actual
);
8192 elsif Has_Discriminants
(Ancestor
) then
8194 ("actual for & must have known discriminants", Actual
, Gen_T
);
8195 Abandon_Instantiation
(Actual
);
8198 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
8200 ("constraint on actual is incompatible with formal", Actual
);
8201 Abandon_Instantiation
(Actual
);
8204 end Validate_Derived_Type_Instance
;
8206 ------------------------------------
8207 -- Validate_Private_Type_Instance --
8208 ------------------------------------
8210 procedure Validate_Private_Type_Instance
is
8211 Formal_Discr
: Entity_Id
;
8212 Actual_Discr
: Entity_Id
;
8213 Formal_Subt
: Entity_Id
;
8216 if Is_Limited_Type
(Act_T
)
8217 and then not Is_Limited_Type
(A_Gen_T
)
8220 ("actual for non-limited & cannot be a limited type", Actual
,
8222 Explain_Limited_Type
(Act_T
, Actual
);
8223 Abandon_Instantiation
(Actual
);
8225 elsif Is_Indefinite_Subtype
(Act_T
)
8226 and then not Is_Indefinite_Subtype
(A_Gen_T
)
8227 and then Ada_Version
>= Ada_95
8230 ("actual for & must be a definite subtype", Actual
, Gen_T
);
8232 elsif not Is_Tagged_Type
(Act_T
)
8233 and then Is_Tagged_Type
(A_Gen_T
)
8236 ("actual for & must be a tagged type", Actual
, Gen_T
);
8238 elsif Has_Discriminants
(A_Gen_T
) then
8239 if not Has_Discriminants
(Act_T
) then
8241 ("actual for & must have discriminants", Actual
, Gen_T
);
8242 Abandon_Instantiation
(Actual
);
8244 elsif Is_Constrained
(Act_T
) then
8246 ("actual for & must be unconstrained", Actual
, Gen_T
);
8247 Abandon_Instantiation
(Actual
);
8250 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
8251 Actual_Discr
:= First_Discriminant
(Act_T
);
8252 while Formal_Discr
/= Empty
loop
8253 if Actual_Discr
= Empty
then
8255 ("discriminants on actual do not match formal",
8257 Abandon_Instantiation
(Actual
);
8260 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
8262 -- access discriminants match if designated types do.
8264 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
8265 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
))))
8266 = E_Anonymous_Access_Type
8267 and then Get_Instance_Of
(
8268 Designated_Type
(Base_Type
(Formal_Subt
)))
8269 = Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
8273 elsif Base_Type
(Formal_Subt
) /=
8274 Base_Type
(Etype
(Actual_Discr
))
8277 ("types of actual discriminants must match formal",
8279 Abandon_Instantiation
(Actual
);
8281 elsif not Subtypes_Statically_Match
8282 (Formal_Subt
, Etype
(Actual_Discr
))
8283 and then Ada_Version
>= Ada_95
8286 ("subtypes of actual discriminants must match formal",
8288 Abandon_Instantiation
(Actual
);
8291 Next_Discriminant
(Formal_Discr
);
8292 Next_Discriminant
(Actual_Discr
);
8295 if Actual_Discr
/= Empty
then
8297 ("discriminants on actual do not match formal",
8299 Abandon_Instantiation
(Actual
);
8306 end Validate_Private_Type_Instance
;
8308 -- Start of processing for Instantiate_Type
8311 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
8312 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
8315 elsif not Is_Entity_Name
(Actual
)
8316 or else not Is_Type
(Entity
(Actual
))
8319 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
8320 Abandon_Instantiation
(Actual
);
8323 Act_T
:= Entity
(Actual
);
8325 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8326 -- as a generic actual parameter if the corresponding formal type
8327 -- does not have a known_discriminant_part, or is a formal derived
8328 -- type that is an Unchecked_Union type.
8330 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
8331 if not Has_Discriminants
(A_Gen_T
)
8333 (Is_Derived_Type
(A_Gen_T
)
8335 Is_Unchecked_Union
(A_Gen_T
))
8339 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
8340 " discriminated formal type", Act_T
);
8345 -- Deal with fixed/floating restrictions
8347 if Is_Floating_Point_Type
(Act_T
) then
8348 Check_Restriction
(No_Floating_Point
, Actual
);
8349 elsif Is_Fixed_Point_Type
(Act_T
) then
8350 Check_Restriction
(No_Fixed_Point
, Actual
);
8353 -- Deal with error of using incomplete type as generic actual
8355 if Ekind
(Act_T
) = E_Incomplete_Type
then
8356 if No
(Underlying_Type
(Act_T
)) then
8357 Error_Msg_N
("premature use of incomplete type", Actual
);
8358 Abandon_Instantiation
(Actual
);
8360 Act_T
:= Full_View
(Act_T
);
8361 Set_Entity
(Actual
, Act_T
);
8363 if Has_Private_Component
(Act_T
) then
8365 ("premature use of type with private component", Actual
);
8369 -- Deal with error of premature use of private type as generic actual
8371 elsif Is_Private_Type
(Act_T
)
8372 and then Is_Private_Type
(Base_Type
(Act_T
))
8373 and then not Is_Generic_Type
(Act_T
)
8374 and then not Is_Derived_Type
(Act_T
)
8375 and then No
(Full_View
(Root_Type
(Act_T
)))
8377 Error_Msg_N
("premature use of private type", Actual
);
8379 elsif Has_Private_Component
(Act_T
) then
8381 ("premature use of type with private component", Actual
);
8384 Set_Instance_Of
(A_Gen_T
, Act_T
);
8386 -- If the type is generic, the class-wide type may also be used
8388 if Is_Tagged_Type
(A_Gen_T
)
8389 and then Is_Tagged_Type
(Act_T
)
8390 and then not Is_Class_Wide_Type
(A_Gen_T
)
8392 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
8393 Class_Wide_Type
(Act_T
));
8396 if not Is_Abstract
(A_Gen_T
)
8397 and then Is_Abstract
(Act_T
)
8400 ("actual of non-abstract formal cannot be abstract", Actual
);
8403 if Is_Scalar_Type
(Gen_T
) then
8404 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
8409 when N_Formal_Private_Type_Definition
=>
8410 Validate_Private_Type_Instance
;
8412 when N_Formal_Derived_Type_Definition
=>
8413 Validate_Derived_Type_Instance
;
8415 when N_Formal_Discrete_Type_Definition
=>
8416 if not Is_Discrete_Type
(Act_T
) then
8418 ("expect discrete type in instantiation of&", Actual
, Gen_T
);
8419 Abandon_Instantiation
(Actual
);
8422 when N_Formal_Signed_Integer_Type_Definition
=>
8423 if not Is_Signed_Integer_Type
(Act_T
) then
8425 ("expect signed integer type in instantiation of&",
8427 Abandon_Instantiation
(Actual
);
8430 when N_Formal_Modular_Type_Definition
=>
8431 if not Is_Modular_Integer_Type
(Act_T
) then
8433 ("expect modular type in instantiation of &", Actual
, Gen_T
);
8434 Abandon_Instantiation
(Actual
);
8437 when N_Formal_Floating_Point_Definition
=>
8438 if not Is_Floating_Point_Type
(Act_T
) then
8440 ("expect float type in instantiation of &", Actual
, Gen_T
);
8441 Abandon_Instantiation
(Actual
);
8444 when N_Formal_Ordinary_Fixed_Point_Definition
=>
8445 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
8447 ("expect ordinary fixed point type in instantiation of &",
8449 Abandon_Instantiation
(Actual
);
8452 when N_Formal_Decimal_Fixed_Point_Definition
=>
8453 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
8455 ("expect decimal type in instantiation of &",
8457 Abandon_Instantiation
(Actual
);
8460 when N_Array_Type_Definition
=>
8461 Validate_Array_Type_Instance
;
8463 when N_Access_To_Object_Definition
=>
8464 Validate_Access_Type_Instance
;
8466 when N_Access_Function_Definition |
8467 N_Access_Procedure_Definition
=>
8468 Validate_Access_Subprogram_Instance
;
8471 raise Program_Error
;
8476 Make_Subtype_Declaration
(Loc
,
8477 Defining_Identifier
=> New_Copy
(Gen_T
),
8478 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
8480 if Is_Private_Type
(Act_T
) then
8481 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8483 elsif Is_Access_Type
(Act_T
)
8484 and then Is_Private_Type
(Designated_Type
(Act_T
))
8486 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8489 -- Flag actual derived types so their elaboration produces the
8490 -- appropriate renamings for the primitive operations of the ancestor.
8491 -- Flag actual for formal private types as well, to determine whether
8492 -- operations in the private part may override inherited operations.
8494 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
8495 or else Nkind
(Def
) = N_Formal_Private_Type_Definition
8497 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
8501 end Instantiate_Type
;
8503 ---------------------
8504 -- Is_In_Main_Unit --
8505 ---------------------
8507 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
8508 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
8509 Current_Unit
: Node_Id
;
8512 if Unum
= Main_Unit
then
8515 -- If the current unit is a subunit then it is either the main unit
8516 -- or is being compiled as part of the main unit.
8518 elsif Nkind
(N
) = N_Compilation_Unit
then
8519 return Nkind
(Unit
(N
)) = N_Subunit
;
8522 Current_Unit
:= Parent
(N
);
8523 while Present
(Current_Unit
)
8524 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8526 Current_Unit
:= Parent
(Current_Unit
);
8529 -- The instantiation node is in the main unit, or else the current
8530 -- node (perhaps as the result of nested instantiations) is in the
8531 -- main unit, or in the declaration of the main unit, which in this
8532 -- last case must be a body.
8534 return Unum
= Main_Unit
8535 or else Current_Unit
= Cunit
(Main_Unit
)
8536 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
8537 or else (Present
(Library_Unit
(Current_Unit
))
8538 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
8539 end Is_In_Main_Unit
;
8541 ----------------------------
8542 -- Load_Parent_Of_Generic --
8543 ----------------------------
8545 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
) is
8546 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
8547 Save_Style_Check
: constant Boolean := Style_Check
;
8548 True_Parent
: Node_Id
;
8549 Inst_Node
: Node_Id
;
8553 if not In_Same_Source_Unit
(N
, Spec
)
8554 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
8555 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
8556 and then not Is_In_Main_Unit
(Spec
))
8558 -- Find body of parent of spec, and analyze it. A special case
8559 -- arises when the parent is an instantiation, that is to say when
8560 -- we are currently instantiating a nested generic. In that case,
8561 -- there is no separate file for the body of the enclosing instance.
8562 -- Instead, the enclosing body must be instantiated as if it were
8563 -- a pending instantiation, in order to produce the body for the
8564 -- nested generic we require now. Note that in that case the
8565 -- generic may be defined in a package body, the instance defined
8566 -- in the same package body, and the original enclosing body may not
8567 -- be in the main unit.
8569 True_Parent
:= Parent
(Spec
);
8572 while Present
(True_Parent
)
8573 and then Nkind
(True_Parent
) /= N_Compilation_Unit
8575 if Nkind
(True_Parent
) = N_Package_Declaration
8577 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
8579 -- Parent is a compilation unit that is an instantiation.
8580 -- Instantiation node has been replaced with package decl.
8582 Inst_Node
:= Original_Node
(True_Parent
);
8585 elsif Nkind
(True_Parent
) = N_Package_Declaration
8586 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
8587 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
8589 -- Parent is an instantiation within another specification.
8590 -- Declaration for instance has been inserted before original
8591 -- instantiation node. A direct link would be preferable?
8593 Inst_Node
:= Next
(True_Parent
);
8595 while Present
(Inst_Node
)
8596 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
8601 -- If the instance appears within a generic, and the generic
8602 -- unit is defined within a formal package of the enclosing
8603 -- generic, there is no generic body available, and none
8604 -- needed. A more precise test should be used ???
8606 if No
(Inst_Node
) then
8612 True_Parent
:= Parent
(True_Parent
);
8616 -- Case where we are currently instantiating a nested generic
8618 if Present
(Inst_Node
) then
8619 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
8621 -- Instantiation node and declaration of instantiated package
8622 -- were exchanged when only the declaration was needed.
8623 -- Restore instantiation node before proceeding with body.
8625 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
8628 -- Now complete instantiation of enclosing body, if it appears
8629 -- in some other unit. If it appears in the current unit, the
8630 -- body will have been instantiated already.
8632 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8634 -- We need to determine the expander mode to instantiate
8635 -- the enclosing body. Because the generic body we need
8636 -- may use global entities declared in the enclosing package
8637 -- (including aggregates) it is in general necessary to
8638 -- compile this body with expansion enabled. The exception
8639 -- is if we are within a generic package, in which case
8640 -- the usual generic rule applies.
8643 Exp_Status
: Boolean := True;
8647 -- Loop through scopes looking for generic package
8649 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
8650 while Present
(Scop
)
8651 and then Scop
/= Standard_Standard
8653 if Ekind
(Scop
) = E_Generic_Package
then
8654 Exp_Status
:= False;
8658 Scop
:= Scope
(Scop
);
8661 Instantiate_Package_Body
8662 (Pending_Body_Info
'(
8663 Inst_Node, True_Parent, Exp_Status,
8664 Get_Code_Unit (Sloc (Inst_Node))));
8668 -- Case where we are not instantiating a nested generic
8671 Opt.Style_Check := False;
8672 Expander_Mode_Save_And_Set (True);
8673 Load_Needed_Body (Comp_Unit, OK);
8674 Opt.Style_Check := Save_Style_Check;
8675 Expander_Mode_Restore;
8678 and then Unit_Requires_Body (Defining_Entity (Spec))
8681 Bname : constant Unit_Name_Type :=
8682 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8685 Error_Msg_Unit_1 := Bname;
8686 Error_Msg_N ("this instantiation requires$!", N);
8688 Get_File_Name (Bname, Subunit => False);
8689 Error_Msg_N ("\but file{ was not found!", N);
8690 raise Unrecoverable_Error;
8696 -- If loading the parent of the generic caused an instantiation
8697 -- circularity, we abandon compilation at this point, because
8698 -- otherwise in some cases we get into trouble with infinite
8699 -- recursions after this point.
8701 if Circularity_Detected then
8702 raise Unrecoverable_Error;
8704 end Load_Parent_Of_Generic;
8706 -----------------------
8707 -- Move_Freeze_Nodes --
8708 -----------------------
8710 procedure Move_Freeze_Nodes
8711 (Out_Of : Entity_Id;
8716 Next_Decl : Node_Id;
8717 Next_Node : Node_Id := After;
8720 function Is_Outer_Type (T : Entity_Id) return Boolean;
8721 -- Check whether entity is declared in a scope external to that
8722 -- of the generic unit.
8728 function Is_Outer_Type (T : Entity_Id) return Boolean is
8729 Scop : Entity_Id := Scope (T);
8732 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8736 while Scop /= Standard_Standard loop
8738 if Scop = Out_Of then
8741 Scop := Scope (Scop);
8749 -- Start of processing for Move_Freeze_Nodes
8756 -- First remove the freeze nodes that may appear before all other
8760 while Present (Decl)
8761 and then Nkind (Decl) = N_Freeze_Entity
8762 and then Is_Outer_Type (Entity (Decl))
8764 Decl := Remove_Head (L);
8765 Insert_After (Next_Node, Decl);
8766 Set_Analyzed (Decl, False);
8771 -- Next scan the list of declarations and remove each freeze node that
8772 -- appears ahead of the current node.
8774 while Present (Decl) loop
8775 while Present (Next (Decl))
8776 and then Nkind (Next (Decl)) = N_Freeze_Entity
8777 and then Is_Outer_Type (Entity (Next (Decl)))
8779 Next_Decl := Remove_Next (Decl);
8780 Insert_After (Next_Node, Next_Decl);
8781 Set_Analyzed (Next_Decl, False);
8782 Next_Node := Next_Decl;
8785 -- If the declaration is a nested package or concurrent type, then
8786 -- recurse. Nested generic packages will have been processed from the
8789 if Nkind (Decl) = N_Package_Declaration then
8790 Spec := Specification (Decl);
8792 elsif Nkind (Decl) = N_Task_Type_Declaration then
8793 Spec := Task_Definition (Decl);
8795 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8796 Spec := Protected_Definition (Decl);
8802 if Present (Spec) then
8803 Move_Freeze_Nodes (Out_Of, Next_Node,
8804 Visible_Declarations (Spec));
8805 Move_Freeze_Nodes (Out_Of, Next_Node,
8806 Private_Declarations (Spec));
8811 end Move_Freeze_Nodes;
8817 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8819 return Generic_Renamings.Table (E).Next_In_HTable;
8822 ------------------------
8823 -- Preanalyze_Actuals --
8824 ------------------------
8826 procedure Pre_Analyze_Actuals (N : Node_Id) is
8829 Errs : constant Int := Serious_Errors_Detected;
8832 Assoc := First (Generic_Associations (N));
8834 while Present (Assoc) loop
8835 Act := Explicit_Generic_Actual_Parameter (Assoc);
8837 -- Within a nested instantiation, a defaulted actual is an
8838 -- empty association, so nothing to analyze. If the actual for
8839 -- a subprogram is an attribute, analyze prefix only, because
8840 -- actual is not a complete attribute reference.
8842 -- If actual is an allocator, analyze expression only. The full
8843 -- analysis can generate code, and if the instance is a compilation
8844 -- unit we have to wait until the package instance is installed to
8845 -- have a proper place to insert this code.
8847 -- String literals may be operators, but at this point we do not
8848 -- know whether the actual is a formal subprogram or a string.
8853 elsif Nkind (Act) = N_Attribute_Reference then
8854 Analyze (Prefix (Act));
8856 elsif Nkind (Act) = N_Explicit_Dereference then
8857 Analyze (Prefix (Act));
8859 elsif Nkind (Act) = N_Allocator then
8861 Expr : constant Node_Id := Expression (Act);
8864 if Nkind (Expr) = N_Subtype_Indication then
8865 Analyze (Subtype_Mark (Expr));
8866 Analyze_List (Constraints (Constraint (Expr)));
8872 elsif Nkind (Act) /= N_Operator_Symbol then
8876 if Errs /= Serious_Errors_Detected then
8877 Abandon_Instantiation (Act);
8882 end Pre_Analyze_Actuals;
8888 procedure Remove_Parent (In_Body : Boolean := False) is
8889 S : Entity_Id := Current_Scope;
8895 -- After child instantiation is complete, remove from scope stack
8896 -- the extra copy of the current scope, and then remove parent
8902 while Current_Scope /= S loop
8904 End_Package_Scope (Current_Scope);
8906 if In_Open_Scopes (P) then
8907 E := First_Entity (P);
8909 while Present (E) loop
8910 Set_Is_Immediately_Visible (E, True);
8914 if Is_Generic_Instance (Current_Scope)
8915 and then P /= Current_Scope
8917 -- We are within an instance of some sibling. Retain
8918 -- visibility of parent, for proper subsequent cleanup,
8919 -- and reinstall private declarations as well.
8921 Set_In_Private_Part (P);
8922 Install_Private_Declarations (P);
8925 -- This looks incomplete: what about compilation units that
8926 -- were made visible by Install_Parent but should not remain
8927 -- visible??? Standard is on the scope stack.
8929 elsif not In_Open_Scopes (Scope (P)) then
8930 Set_Is_Immediately_Visible (P, False);
8934 -- Reset visibility of entities in the enclosing scope.
8936 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8937 Hidden := First_Elmt (Hidden_Entities);
8939 while Present (Hidden) loop
8940 Set_Is_Immediately_Visible (Node (Hidden), True);
8945 -- Each body is analyzed separately, and there is no context
8946 -- that needs preserving from one body instance to the next,
8947 -- so remove all parent scopes that have been installed.
8949 while Present (S) loop
8950 End_Package_Scope (S);
8951 Set_Is_Immediately_Visible (S, False);
8953 exit when S = Standard_Standard;
8963 procedure Restore_Env is
8964 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8967 Ada_Version := Saved.Ada_Version;
8969 if No (Current_Instantiated_Parent.Act_Id) then
8971 -- Restore environment after subprogram inlining
8973 Restore_Private_Views (Empty);
8976 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8977 Exchanged_Views := Saved.Exchanged_Views;
8978 Hidden_Entities := Saved.Hidden_Entities;
8979 Current_Sem_Unit := Saved.Current_Sem_Unit;
8981 Instance_Envs.Decrement_Last;
8984 ---------------------------
8985 -- Restore_Private_Views --
8986 ---------------------------
8988 procedure Restore_Private_Views
8989 (Pack_Id : Entity_Id;
8990 Is_Package : Boolean := True)
8998 procedure Restore_Nested_Formal (Formal : Entity_Id);
8999 -- Hide the generic formals of formal packages declared with box
9000 -- which were reachable in the current instantiation.
9002 procedure Restore_Nested_Formal (Formal : Entity_Id) is
9005 if Present (Renamed_Object (Formal))
9006 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
9010 elsif Present (Associated_Formal_Package (Formal))
9011 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9013 Ent := First_Entity (Formal);
9015 while Present (Ent) loop
9016 exit when Ekind (Ent) = E_Package
9017 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9019 Set_Is_Hidden (Ent);
9020 Set_Is_Potentially_Use_Visible (Ent, False);
9022 if Ekind (Ent) = E_Package then
9024 Restore_Nested_Formal (Ent);
9030 end Restore_Nested_Formal;
9033 M := First_Elmt (Exchanged_Views);
9034 while Present (M) loop
9037 -- Subtypes of types whose views have been exchanged, and that
9038 -- are defined within the instance, were not on the list of
9039 -- Private_Dependents on entry to the instance, so they have to
9040 -- be exchanged explicitly now, in order to remain consistent with
9041 -- the view of the parent type.
9043 if Ekind (Typ) = E_Private_Type
9044 or else Ekind (Typ) = E_Limited_Private_Type
9045 or else Ekind (Typ) = E_Record_Type_With_Private
9047 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9049 while Present (Dep_Elmt) loop
9050 Dep_Typ := Node (Dep_Elmt);
9052 if Scope (Dep_Typ) = Pack_Id
9053 and then Present (Full_View (Dep_Typ))
9055 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9056 Exchange_Declarations (Dep_Typ);
9059 Next_Elmt (Dep_Elmt);
9063 Exchange_Declarations (Node (M));
9067 if No (Pack_Id) then
9071 -- Make the generic formal parameters private, and make the formal
9072 -- types into subtypes of the actuals again.
9074 E := First_Entity (Pack_Id);
9076 while Present (E) loop
9077 Set_Is_Hidden (E, True);
9080 and then Nkind (Parent (E)) = N_Subtype_Declaration
9082 Set_Is_Generic_Actual_Type (E, False);
9084 -- An unusual case of aliasing: the actual may also be directly
9085 -- visible in the generic, and be private there, while it is
9086 -- fully visible in the context of the instance. The internal
9087 -- subtype is private in the instance, but has full visibility
9088 -- like its parent in the enclosing scope. This enforces the
9089 -- invariant that the privacy status of all private dependents of
9090 -- a type coincide with that of the parent type. This can only
9091 -- happen when a generic child unit is instantiated within a
9094 if Is_Private_Type (E)
9095 and then not Is_Private_Type (Etype (E))
9097 Exchange_Declarations (E);
9100 elsif Ekind (E) = E_Package then
9102 -- The end of the renaming list is the renaming of the generic
9103 -- package itself. If the instance is a subprogram, all entities
9104 -- in the corresponding package are renamings. If this entity is
9105 -- a formal package, make its own formals private as well. The
9106 -- actual in this case is itself the renaming of an instantation.
9107 -- If the entity is not a package renaming, it is the entity
9108 -- created to validate formal package actuals: ignore.
9110 -- If the actual is itself a formal package for the enclosing
9111 -- generic, or the actual for such a formal package, it remains
9112 -- visible on exit from the instance, and therefore nothing
9113 -- needs to be done either, except to keep it accessible.
9116 and then Renamed_Object (E) = Pack_Id
9120 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9123 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9124 Set_Is_Hidden (E, False);
9128 Act_P : constant Entity_Id := Renamed_Object (E);
9132 Id := First_Entity (Act_P);
9134 and then Id /= First_Private_Entity (Act_P)
9136 exit when Ekind (Id) = E_Package
9137 and then Renamed_Object (Id) = Act_P;
9139 Set_Is_Hidden (Id, True);
9140 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9142 if Ekind (Id) = E_Package then
9143 Restore_Nested_Formal (Id);
9154 end Restore_Private_Views;
9161 (Gen_Unit : Entity_Id;
9162 Act_Unit : Entity_Id)
9166 Set_Instance_Env (Gen_Unit, Act_Unit);
9169 ----------------------------
9170 -- Save_Global_References --
9171 ----------------------------
9173 procedure Save_Global_References (N : Node_Id) is
9174 Gen_Scope : Entity_Id;
9178 function Is_Global (E : Entity_Id) return Boolean;
9179 -- Check whether entity is defined outside of generic unit.
9180 -- Examine the scope of an entity, and the scope of the scope,
9181 -- etc, until we find either Standard, in which case the entity
9182 -- is global, or the generic unit itself, which indicates that
9183 -- the entity is local. If the entity is the generic unit itself,
9184 -- as in the case of a recursive call, or the enclosing generic unit,
9185 -- if different from the current scope, then it is local as well,
9186 -- because it will be replaced at the point of instantiation. On
9187 -- the other hand, if it is a reference to a child unit of a common
9188 -- ancestor, which appears in an instantiation, it is global because
9189 -- it is used to denote a specific compilation unit at the time the
9190 -- instantiations will be analyzed.
9192 procedure Reset_Entity (N : Node_Id);
9193 -- Save semantic information on global entity, so that it is not
9194 -- resolved again at instantiation time.
9196 procedure Save_Entity_Descendants (N : Node_Id);
9197 -- Apply Save_Global_References to the two syntactic descendants of
9198 -- non-terminal nodes that carry an Associated_Node and are processed
9199 -- through Reset_Entity. Once the global entity (if any) has been
9200 -- captured together with its type, only two syntactic descendants
9201 -- need to be traversed to complete the processing of the tree rooted
9202 -- at N. This applies to Selected_Components, Expanded_Names, and to
9203 -- Operator nodes. N can also be a character literal, identifier, or
9204 -- operator symbol node, but the call has no effect in these cases.
9206 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9207 -- Default actuals in nested instances must be handled specially
9208 -- because there is no link to them from the original tree. When an
9209 -- actual subprogram is given by a default, we add an explicit generic
9210 -- association for it in the instantiation node. When we save the
9211 -- global references on the name of the instance, we recover the list
9212 -- of generic associations, and add an explicit one to the original
9213 -- generic tree, through which a global actual can be preserved.
9214 -- Similarly, if a child unit is instantiated within a sibling, in the
9215 -- context of the parent, we must preserve the identifier of the parent
9216 -- so that it can be properly resolved in a subsequent instantiation.
9218 procedure Save_Global_Descendant (D : Union_Id);
9219 -- Apply Save_Global_References recursively to the descendents of
9222 procedure Save_References (N : Node_Id);
9223 -- This is the recursive procedure that does the work, once the
9224 -- enclosing generic scope has been established.
9230 function Is_Global (E : Entity_Id) return Boolean is
9231 Se : Entity_Id := Scope (E);
9233 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9234 -- Determine whether the parent node of a reference to a child unit
9235 -- denotes an instantiation or a formal package, in which case the
9236 -- reference to the child unit is global, even if it appears within
9237 -- the current scope (e.g. when the instance appears within the body
9240 ----------------------
9241 -- Is_Instance_Node --
9242 ----------------------
9244 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9246 return (Nkind (Decl) in N_Generic_Instantiation
9248 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9249 end Is_Instance_Node;
9251 -- Start of processing for Is_Global
9254 if E = Gen_Scope then
9257 elsif E = Standard_Standard then
9260 elsif Is_Child_Unit (E)
9261 and then (Is_Instance_Node (Parent (N2))
9262 or else (Nkind (Parent (N2)) = N_Expanded_Name
9263 and then N2 = Selector_Name (Parent (N2))
9264 and then Is_Instance_Node (Parent (Parent (N2)))))
9269 while Se /= Gen_Scope loop
9270 if Se = Standard_Standard then
9285 procedure Reset_Entity (N : Node_Id) is
9287 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9288 -- The type of N2 is global to the generic unit. Save the
9289 -- type in the generic node.
9291 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9292 -- Find the ultimate ancestor of the current unit. If it is
9293 -- not a generic unit, then the name of the current unit
9294 -- in the prefix of an expanded name must be replaced with
9295 -- its generic homonym to ensure that it will be properly
9296 -- resolved in an instance.
9298 ---------------------
9299 -- Set_Global_Type --
9300 ---------------------
9302 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9303 Typ : constant Entity_Id := Etype (N2);
9309 and then Has_Private_View (Entity (N))
9311 -- If the entity of N is not the associated node, this is
9312 -- a nested generic and it has an associated node as well,
9313 -- whose type is already the full view (see below). Indicate
9314 -- that the original node has a private view.
9316 Set_Has_Private_View (N);
9319 -- If not a private type, nothing else to do
9321 if not Is_Private_Type (Typ) then
9322 if Is_Array_Type (Typ)
9323 and then Is_Private_Type (Component_Type (Typ))
9325 Set_Has_Private_View (N);
9328 -- If it is a derivation of a private type in a context where
9329 -- no full view is needed, nothing to do either.
9331 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9334 -- Otherwise mark the type for flipping and use the full_view
9338 Set_Has_Private_View (N);
9340 if Present (Full_View (Typ)) then
9341 Set_Etype (N2, Full_View (Typ));
9344 end Set_Global_Type;
9350 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9351 Par : Entity_Id := E;
9354 while Is_Child_Unit (Par) loop
9361 -- Start of processing for Reset_Entity
9364 N2 := Get_Associated_Node (N);
9368 if Is_Global (E) then
9369 Set_Global_Type (N, N2);
9371 elsif Nkind (N) = N_Op_Concat
9372 and then Is_Generic_Type (Etype (N2))
9374 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9375 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9376 and then Is_Intrinsic_Subprogram (E)
9381 -- Entity is local. Mark generic node as unresolved.
9382 -- Note that now it does not have an entity.
9384 Set_Associated_Node (N, Empty);
9385 Set_Etype (N, Empty);
9388 if (Nkind (Parent (N)) = N_Package_Instantiation
9389 or else Nkind (Parent (N)) = N_Function_Instantiation
9390 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9391 and then N = Name (Parent (N))
9393 Save_Global_Defaults (Parent (N), Parent (N2));
9396 elsif Nkind (Parent (N)) = N_Selected_Component
9397 and then Nkind (Parent (N2)) = N_Expanded_Name
9400 if Is_Global (Entity (Parent (N2))) then
9401 Change_Selected_Component_To_Expanded_Name (Parent (N));
9402 Set_Associated_Node (Parent (N), Parent (N2));
9403 Set_Global_Type (Parent (N), Parent (N2));
9404 Save_Entity_Descendants (N);
9406 -- If this is a reference to the current generic entity,
9407 -- replace by the name of the generic homonym of the current
9408 -- package. This is because in an instantiation Par.P.Q will
9409 -- not resolve to the name of the instance, whose enclosing
9410 -- scope is not necessarily Par. We use the generic homonym
9411 -- rather that the name of the generic itself, because it may
9412 -- be hidden by a local declaration.
9414 elsif In_Open_Scopes (Entity (Parent (N2)))
9416 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9418 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9419 Rewrite (Parent (N),
9420 Make_Identifier (Sloc (N),
9422 Chars (Generic_Homonym (Entity (Parent (N2))))));
9424 Rewrite (Parent (N),
9425 Make_Identifier (Sloc (N),
9426 Chars => Chars (Selector_Name (Parent (N2)))));
9430 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9431 or else Nkind (Parent (Parent (N)))
9432 = N_Function_Instantiation
9433 or else Nkind (Parent (Parent (N)))
9434 = N_Procedure_Instantiation)
9435 and then Parent (N) = Name (Parent (Parent (N)))
9437 Save_Global_Defaults
9438 (Parent (Parent (N)), Parent (Parent ((N2))));
9441 -- A selected component may denote a static constant that has
9442 -- been folded. Make the same replacement in original tree.
9444 elsif Nkind (Parent (N)) = N_Selected_Component
9445 and then (Nkind (Parent (N2)) = N_Integer_Literal
9446 or else Nkind (Parent (N2)) = N_Real_Literal)
9448 Rewrite (Parent (N),
9449 New_Copy (Parent (N2)));
9450 Set_Analyzed (Parent (N), False);
9452 -- A selected component may be transformed into a parameterless
9453 -- function call. If the called entity is global, rewrite the
9454 -- node appropriately, i.e. as an extended name for the global
9457 elsif Nkind (Parent (N)) = N_Selected_Component
9458 and then Nkind (Parent (N2)) = N_Function_Call
9459 and then Is_Global (Entity (Name (Parent (N2))))
9461 Change_Selected_Component_To_Expanded_Name (Parent (N));
9462 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9463 Set_Global_Type (Parent (N), Name (Parent (N2)));
9464 Save_Entity_Descendants (N);
9467 -- Entity is local. Reset in generic unit, so that node
9468 -- is resolved anew at the point of instantiation.
9470 Set_Associated_Node (N, Empty);
9471 Set_Etype (N, Empty);
9475 -----------------------------
9476 -- Save_Entity_Descendants --
9477 -----------------------------
9479 procedure Save_Entity_Descendants (N : Node_Id) is
9483 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9484 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9487 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9489 when N_Expanded_Name | N_Selected_Component =>
9490 Save_Global_Descendant (Union_Id (Prefix (N)));
9491 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9493 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9497 raise Program_Error;
9499 end Save_Entity_Descendants;
9501 --------------------------
9502 -- Save_Global_Defaults --
9503 --------------------------
9505 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9506 Loc : constant Source_Ptr := Sloc (N1);
9507 Assoc2 : constant List_Id := Generic_Associations (N2);
9508 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9518 Assoc1 := Generic_Associations (N1);
9520 if Present (Assoc1) then
9521 Act1 := First (Assoc1);
9524 Set_Generic_Associations (N1, New_List);
9525 Assoc1 := Generic_Associations (N1);
9528 if Present (Assoc2) then
9529 Act2 := First (Assoc2);
9534 while Present (Act1) and then Present (Act2) loop
9539 -- Find the associations added for default suprograms.
9541 if Present (Act2) then
9542 while Nkind (Act2) /= N_Generic_Association
9543 or else No (Entity (Selector_Name (Act2)))
9544 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9549 -- Add a similar association if the default is global. The
9550 -- renaming declaration for the actual has been analyzed, and
9551 -- its alias is the program it renames. Link the actual in the
9552 -- original generic tree with the node in the analyzed tree.
9554 while Present (Act2) loop
9555 Subp := Entity (Selector_Name (Act2));
9556 Def := Explicit_Generic_Actual_Parameter (Act2);
9558 -- Following test is defence against rubbish errors
9560 if No (Alias (Subp)) then
9564 -- Retrieve the resolved actual from the renaming declaration
9565 -- created for the instantiated formal.
9567 Actual := Entity (Name (Parent (Parent (Subp))));
9568 Set_Entity (Def, Actual);
9569 Set_Etype (Def, Etype (Actual));
9571 if Is_Global (Actual) then
9573 Make_Generic_Association (Loc,
9574 Selector_Name => New_Occurrence_Of (Subp, Loc),
9575 Explicit_Generic_Actual_Parameter =>
9576 New_Occurrence_Of (Actual, Loc));
9579 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9581 Append (Ndec, Assoc1);
9583 -- If there are other defaults, add a dummy association
9584 -- in case there are other defaulted formals with the same
9587 elsif Present (Next (Act2)) then
9589 Make_Generic_Association (Loc,
9590 Selector_Name => New_Occurrence_Of (Subp, Loc),
9591 Explicit_Generic_Actual_Parameter => Empty);
9593 Append (Ndec, Assoc1);
9600 if Nkind (Name (N1)) = N_Identifier
9601 and then Is_Child_Unit (Gen_Id)
9602 and then Is_Global (Gen_Id)
9603 and then Is_Generic_Unit (Scope (Gen_Id))
9604 and then In_Open_Scopes (Scope (Gen_Id))
9606 -- This is an instantiation of a child unit within a sibling,
9607 -- so that the generic parent is in scope. An eventual instance
9608 -- must occur within the scope of an instance of the parent.
9609 -- Make name in instance into an expanded name, to preserve the
9610 -- identifier of the parent, so it can be resolved subsequently.
9613 Make_Expanded_Name (Loc,
9614 Chars => Chars (Gen_Id),
9615 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9616 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9617 Set_Entity (Name (N2), Gen_Id);
9620 Make_Expanded_Name (Loc,
9621 Chars => Chars (Gen_Id),
9622 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9623 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9625 Set_Associated_Node (Name (N1), Name (N2));
9626 Set_Associated_Node (Prefix (Name (N1)), Empty);
9628 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9629 Set_Etype (Name (N1), Etype (Gen_Id));
9632 end Save_Global_Defaults;
9634 ----------------------------
9635 -- Save_Global_Descendant --
9636 ----------------------------
9638 procedure Save_Global_Descendant (D : Union_Id) is
9642 if D in Node_Range then
9643 if D = Union_Id (Empty) then
9646 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9647 Save_References (Node_Id (D));
9650 elsif D in List_Range then
9651 if D = Union_Id (No_List)
9652 or else Is_Empty_List (List_Id (D))
9657 N1 := First (List_Id (D));
9658 while Present (N1) loop
9659 Save_References (N1);
9664 -- Element list or other non-node field, nothing to do
9669 end Save_Global_Descendant;
9671 ---------------------
9672 -- Save_References --
9673 ---------------------
9675 -- This is the recursive procedure that does the work, once the
9676 -- enclosing generic scope has been established. We have to treat
9677 -- specially a number of node rewritings that are required by semantic
9678 -- processing and which change the kind of nodes in the generic copy:
9679 -- typically constant-folding, replacing an operator node by a string
9680 -- literal, or a selected component by an expanded name. In each of
9681 -- those cases, the transformation is propagated to the generic unit.
9683 procedure Save_References (N : Node_Id) is
9688 elsif Nkind (N) = N_Character_Literal
9689 or else Nkind (N) = N_Operator_Symbol
9691 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9694 elsif Nkind (N) = N_Operator_Symbol
9695 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9697 Change_Operator_Symbol_To_String_Literal (N);
9700 elsif Nkind (N) in N_Op then
9702 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9704 if Nkind (N) = N_Op_Concat then
9705 Set_Is_Component_Left_Opnd (N,
9706 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9708 Set_Is_Component_Right_Opnd (N,
9709 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9714 -- Node may be transformed into call to a user-defined operator
9716 N2 := Get_Associated_Node (N);
9718 if Nkind (N2) = N_Function_Call then
9719 E := Entity (Name (N2));
9722 and then Is_Global (E)
9724 Set_Etype (N, Etype (N2));
9726 Set_Associated_Node (N, Empty);
9727 Set_Etype (N, Empty);
9730 elsif Nkind (N2) = N_Integer_Literal
9731 or else Nkind (N2) = N_Real_Literal
9732 or else Nkind (N2) = N_String_Literal
9734 -- Operation was constant-folded, perform the same
9735 -- replacement in generic.
9737 Rewrite (N, New_Copy (N2));
9738 Set_Analyzed (N, False);
9740 elsif Nkind (N2) = N_Identifier
9741 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9743 -- Same if call was folded into a literal, but in this
9744 -- case retain the entity to avoid spurious ambiguities
9745 -- if id is overloaded at the point of instantiation or
9748 Rewrite (N, New_Copy (N2));
9749 Set_Analyzed (N, False);
9753 -- Complete the check on operands, if node has not been
9756 if Nkind (N) in N_Op then
9757 Save_Entity_Descendants (N);
9760 elsif Nkind (N) = N_Identifier then
9761 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9763 -- If this is a discriminant reference, always save it.
9764 -- It is used in the instance to find the corresponding
9765 -- discriminant positionally rather than by name.
9767 Set_Original_Discriminant
9768 (N, Original_Discriminant (Get_Associated_Node (N)));
9772 N2 := Get_Associated_Node (N);
9774 if Nkind (N2) = N_Function_Call then
9775 E := Entity (Name (N2));
9777 -- Name resolves to a call to parameterless function.
9778 -- If original entity is global, mark node as resolved.
9781 and then Is_Global (E)
9783 Set_Etype (N, Etype (N2));
9785 Set_Associated_Node (N, Empty);
9786 Set_Etype (N, Empty);
9790 Nkind (N2) = N_Integer_Literal or else
9791 Nkind (N2) = N_Real_Literal or else
9792 Nkind (N2) = N_String_Literal
9794 -- Name resolves to named number that is constant-folded,
9795 -- or to string literal from concatenation.
9796 -- Perform the same replacement in generic.
9798 Rewrite (N, New_Copy (N2));
9799 Set_Analyzed (N, False);
9801 elsif Nkind (N2) = N_Explicit_Dereference then
9803 -- An identifier is rewritten as a dereference if it is
9804 -- the prefix in a selected component, and it denotes an
9805 -- access to a composite type, or a parameterless function
9806 -- call that returns an access type.
9808 -- Check whether corresponding entity in prefix is global.
9810 if Is_Entity_Name (Prefix (N2))
9811 and then Present (Entity (Prefix (N2)))
9812 and then Is_Global (Entity (Prefix (N2)))
9815 Make_Explicit_Dereference (Sloc (N),
9816 Prefix => Make_Identifier (Sloc (N),
9817 Chars => Chars (N))));
9818 Set_Associated_Node (Prefix (N), Prefix (N2));
9820 elsif Nkind (Prefix (N2)) = N_Function_Call
9821 and then Is_Global (Entity (Name (Prefix (N2))))
9824 Make_Explicit_Dereference (Sloc (N),
9825 Prefix => Make_Function_Call (Sloc (N),
9827 Make_Identifier (Sloc (N),
9828 Chars => Chars (N)))));
9831 (Name (Prefix (N)), Name (Prefix (N2)));
9834 Set_Associated_Node (N, Empty);
9835 Set_Etype (N, Empty);
9838 -- The subtype mark of a nominally unconstrained object
9839 -- is rewritten as a subtype indication using the bounds
9840 -- of the expression. Recover the original subtype mark.
9842 elsif Nkind (N2) = N_Subtype_Indication
9843 and then Is_Entity_Name (Original_Node (N2))
9845 Set_Associated_Node (N, Original_Node (N2));
9853 elsif Nkind (N) in N_Entity then
9858 use Atree.Unchecked_Access;
9859 -- This code section is part of implementing an untyped tree
9860 -- traversal, so it needs direct access to node fields.
9863 if Nkind (N) = N_Aggregate
9865 Nkind (N) = N_Extension_Aggregate
9867 N2 := Get_Associated_Node (N);
9870 or else No (Etype (N2))
9871 or else not Is_Global (Etype (N2))
9873 Set_Associated_Node (N, Empty);
9876 Save_Global_Descendant (Field1 (N));
9877 Save_Global_Descendant (Field2 (N));
9878 Save_Global_Descendant (Field3 (N));
9879 Save_Global_Descendant (Field5 (N));
9881 -- All other cases than aggregates
9884 Save_Global_Descendant (Field1 (N));
9885 Save_Global_Descendant (Field2 (N));
9886 Save_Global_Descendant (Field3 (N));
9887 Save_Global_Descendant (Field4 (N));
9888 Save_Global_Descendant (Field5 (N));
9892 end Save_References;
9894 -- Start of processing for Save_Global_References
9897 Gen_Scope := Current_Scope;
9899 -- If the generic unit is a child unit, references to entities in
9900 -- the parent are treated as local, because they will be resolved
9901 -- anew in the context of the instance of the parent.
9903 while Is_Child_Unit (Gen_Scope)
9904 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9906 Gen_Scope := Scope (Gen_Scope);
9909 Save_References (N);
9910 end Save_Global_References;
9912 --------------------------------------
9913 -- Set_Copied_Sloc_For_Inlined_Body --
9914 --------------------------------------
9916 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9918 Create_Instantiation_Source (N, E, True, S_Adjustment);
9919 end Set_Copied_Sloc_For_Inlined_Body;
9921 ---------------------
9922 -- Set_Instance_Of --
9923 ---------------------
9925 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9927 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9928 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9929 Generic_Renamings.Increment_Last;
9930 end Set_Instance_Of;
9932 --------------------
9933 -- Set_Next_Assoc --
9934 --------------------
9936 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9938 Generic_Renamings.Table (E).Next_In_HTable := Next;
9945 procedure Start_Generic is
9947 -- ??? I am sure more things could be factored out in this
9948 -- routine. Should probably be done at a later stage.
9950 Generic_Flags.Increment_Last;
9951 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9952 Inside_A_Generic := True;
9954 Expander_Mode_Save_And_Set (False);
9957 ----------------------
9958 -- Set_Instance_Env --
9959 ----------------------
9961 procedure Set_Instance_Env
9962 (Gen_Unit : Entity_Id;
9963 Act_Unit : Entity_Id)
9967 -- Regardless of the current mode, predefined units are analyzed in
9968 -- the most current Ada mode, and earlier version Ada checks do not
9969 -- apply to predefined units.
9971 if Is_Internal_File_Name
9972 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
9973 Renamings_Included => True) then
9974 Ada_Version := Ada_Version_Type'Last;
9977 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
9978 end Set_Instance_Env;
9984 procedure Switch_View (T : Entity_Id) is
9985 BT : constant Entity_Id := Base_Type (T);
9986 Priv_Elmt : Elmt_Id := No_Elmt;
9987 Priv_Sub : Entity_Id;
9990 -- T may be private but its base type may have been exchanged through
9991 -- some other occurrence, in which case there is nothing to switch.
9993 if not Is_Private_Type (BT) then
9997 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9999 if Present (Full_View (BT)) then
10000 Append_Elmt (Full_View (BT), Exchanged_Views);
10001 Exchange_Declarations (BT);
10004 while Present (Priv_Elmt) loop
10005 Priv_Sub := (Node (Priv_Elmt));
10007 -- We avoid flipping the subtype if the Etype of its full
10008 -- view is private because this would result in a malformed
10009 -- subtype. This occurs when the Etype of the subtype full
10010 -- view is the full view of the base type (and since the
10011 -- base types were just switched, the subtype is pointing
10012 -- to the wrong view). This is currently the case for
10013 -- tagged record types, access types (maybe more?) and
10014 -- needs to be resolved. ???
10016 if Present (Full_View (Priv_Sub))
10017 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10019 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10020 Exchange_Declarations (Priv_Sub);
10023 Next_Elmt (Priv_Elmt);
10027 -----------------------------
10028 -- Valid_Default_Attribute --
10029 -----------------------------
10031 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10032 Attr_Id : constant Attribute_Id :=
10033 Get_Attribute_Id (Attribute_Name (Def));
10034 T : constant Entity_Id := Entity (Prefix (Def));
10035 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10048 F := First_Formal (Nam);
10049 while Present (F) loop
10050 Num_F := Num_F + 1;
10055 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10056 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10057 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10058 Attribute_Unbiased_Rounding =>
10061 and then Is_Floating_Point_Type (T);
10063 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10064 Attribute_Value | Attribute_Wide_Image |
10065 Attribute_Wide_Value =>
10066 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10068 when Attribute_Max | Attribute_Min =>
10069 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10071 when Attribute_Input =>
10072 OK := (Is_Fun and then Num_F = 1);
10074 when Attribute_Output | Attribute_Read | Attribute_Write =>
10075 OK := (not Is_Fun and then Num_F = 2);
10082 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10085 end Valid_Default_Attribute;