1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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
;
37 with Lib
.Load
; use Lib
.Load
;
38 with Lib
.Xref
; use Lib
.Xref
;
39 with Nlists
; use Nlists
;
40 with Nmake
; use Nmake
;
42 with Rident
; use Rident
;
43 with Restrict
; use Restrict
;
44 with Rtsfind
; use Rtsfind
;
46 with Sem_Cat
; use Sem_Cat
;
47 with Sem_Ch3
; use Sem_Ch3
;
48 with Sem_Ch6
; use Sem_Ch6
;
49 with Sem_Ch7
; use Sem_Ch7
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Ch10
; use Sem_Ch10
;
52 with Sem_Ch13
; use Sem_Ch13
;
53 with Sem_Disp
; use Sem_Disp
;
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 -- The following subprograms create abbreviated declarations for formal
265 -- scalar types. We introduce an anonymous base of the proper class for
266 -- each of them, and define the formals as constrained first subtypes of
267 -- their bases. The bounds are expressions that are non-static in the
270 procedure Analyze_Formal_Decimal_Fixed_Point_Type
271 (T
: Entity_Id
; Def
: Node_Id
);
272 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
273 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
274 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
275 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
276 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
277 (T
: Entity_Id
; Def
: Node_Id
);
279 procedure Analyze_Formal_Private_Type
283 -- This needs comments???
285 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
287 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
288 -- This needs comments ???
290 function Analyze_Associations
293 F_Copy
: List_Id
) return List_Id
;
294 -- At instantiation time, build the list of associations between formals
295 -- and actuals. Each association becomes a renaming declaration for the
296 -- formal entity. F_Copy is the analyzed list of formals in the generic
297 -- copy. It is used to apply legality checks to the actuals. I_Node is the
298 -- instantiation node itself.
300 procedure Analyze_Subprogram_Instantiation
304 procedure Build_Instance_Compilation_Unit_Nodes
308 -- This procedure is used in the case where the generic instance of a
309 -- subprogram body or package body is a library unit. In this case, the
310 -- original library unit node for the generic instantiation must be
311 -- replaced by the resulting generic body, and a link made to a new
312 -- compilation unit node for the generic declaration. The argument N is
313 -- the original generic instantiation. Act_Body and Act_Decl are the body
314 -- and declaration of the instance (either package body and declaration
315 -- nodes or subprogram body and declaration nodes depending on the case).
316 -- On return, the node N has been rewritten with the actual body.
318 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
319 -- Apply the following to all formal packages in generic associations
321 procedure Check_Formal_Package_Instance
322 (Formal_Pack
: Entity_Id
;
323 Actual_Pack
: Entity_Id
);
324 -- Verify that the actuals of the actual instance match the actuals of
325 -- the template for a formal package that is not declared with a box.
327 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
328 -- If the generic is a local entity and the corresponding body has not
329 -- been seen yet, flag enclosing packages to indicate that it will be
330 -- elaborated after the generic body. Subprograms declared in the same
331 -- package cannot be inlined by the front-end because front-end inlining
332 -- requires a strict linear order of elaboration.
334 procedure Check_Hidden_Child_Unit
336 Gen_Unit
: Entity_Id
;
337 Act_Decl_Id
: Entity_Id
);
338 -- If the generic unit is an implicit child instance within a parent
339 -- instance, we need to make an explicit test that it is not hidden by
340 -- a child instance of the same name and parent.
342 procedure Check_Private_View
(N
: Node_Id
);
343 -- Check whether the type of a generic entity has a different view between
344 -- the point of generic analysis and the point of instantiation. If the
345 -- view has changed, then at the point of instantiation we restore the
346 -- correct view to perform semantic analysis of the instance, and reset
347 -- the current view after instantiation. The processing is driven by the
348 -- current private status of the type of the node, and Has_Private_View,
349 -- a flag that is set at the point of generic compilation. If view and
350 -- flag are inconsistent then the type is updated appropriately.
352 procedure Check_Generic_Actuals
353 (Instance
: Entity_Id
;
354 Is_Formal_Box
: Boolean);
355 -- Similar to previous one. Check the actuals in the instantiation,
356 -- whose views can change between the point of instantiation and the point
357 -- of instantiation of the body. In addition, mark the generic renamings
358 -- as generic actuals, so that they are not compatible with other actuals.
359 -- Recurse on an actual that is a formal package whose declaration has
362 function Contains_Instance_Of
365 N
: Node_Id
) return Boolean;
366 -- Inner is instantiated within the generic Outer. Check whether Inner
367 -- directly or indirectly contains an instance of Outer or of one of its
368 -- parents, in the case of a subunit. Each generic unit holds a list of
369 -- the entities instantiated within (at any depth). This procedure
370 -- determines whether the set of such lists contains a cycle, i.e. an
371 -- illegal circular instantiation.
373 function Denotes_Formal_Package
375 On_Exit
: Boolean := False) return Boolean;
376 -- Returns True if E is a formal package of an enclosing generic, or
377 -- the actual for such a formal in an enclosing instantiation. If such
378 -- a package is used as a formal in an nested generic, or as an actual
379 -- in a nested instantiation, the visibility of ITS formals should not
380 -- be modified. When called from within Restore_Private_Views, the flag
381 -- On_Exit is true, to indicate that the search for a possible enclosing
382 -- instance should ignore the current one.
384 function Find_Actual_Type
386 Gen_Scope
: Entity_Id
) return Entity_Id
;
387 -- When validating the actual types of a child instance, check whether
388 -- the formal is a formal type of the parent unit, and retrieve the current
389 -- actual for it. Typ is the entity in the analyzed formal type declaration
390 -- (component or index type of an array type) and Gen_Scope is the scope of
391 -- the analyzed formal array type.
393 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
;
394 -- Given the entity of a unit that is an instantiation, retrieve the
395 -- original instance node. This is used when loading the instantiations
396 -- of the ancestors of a child generic that is being instantiated.
398 function In_Same_Declarative_Part
400 Inst
: Node_Id
) return Boolean;
401 -- True if the instantiation Inst and the given freeze_node F_Node appear
402 -- within the same declarative part, ignoring subunits, but with no inter-
403 -- vening suprograms or concurrent units. If true, the freeze node
404 -- of the instance can be placed after the freeze node of the parent,
405 -- which it itself an instance.
407 function In_Main_Context
(E
: Entity_Id
) return Boolean;
408 -- Check whether an instantiation is in the context of the main unit.
409 -- Used to determine whether its body should be elaborated to allow
410 -- front-end inlining.
412 procedure Set_Instance_Env
413 (Gen_Unit
: Entity_Id
;
414 Act_Unit
: Entity_Id
);
415 -- Save current instance on saved environment, to be used to determine
416 -- the global status of entities in nested instances. Part of Save_Env.
417 -- called after verifying that the generic unit is legal for the instance.
419 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
420 -- Associate analyzed generic parameter with corresponding
421 -- instance. Used for semantic checks at instantiation time.
423 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
424 -- Traverse the Exchanged_Views list to see if a type was private
425 -- and has already been flipped during this phase of instantiation.
427 procedure Hide_Current_Scope
;
428 -- When compiling a generic child unit, the parent context must be
429 -- present, but the instance and all entities that may be generated
430 -- must be inserted in the current scope. We leave the current scope
431 -- on the stack, but make its entities invisible to avoid visibility
432 -- problems. This is reversed at the end of instantiations. This is
433 -- not done for the instantiation of the bodies, which only require the
434 -- instances of the generic parents to be in scope.
436 procedure Install_Body
441 -- If the instantiation happens textually before the body of the generic,
442 -- the instantiation of the body must be analyzed after the generic body,
443 -- and not at the point of instantiation. Such early instantiations can
444 -- happen if the generic and the instance appear in a package declaration
445 -- because the generic body can only appear in the corresponding package
446 -- body. Early instantiations can also appear if generic, instance and
447 -- body are all in the declarative part of a subprogram or entry. Entities
448 -- of packages that are early instantiations are delayed, and their freeze
449 -- node appears after the generic body.
451 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
452 -- Insert freeze node at the end of the declarative part that includes the
453 -- instance node N. If N is in the visible part of an enclosing package
454 -- declaration, the freeze node has to be inserted at the end of the
455 -- private declarations, if any.
457 procedure Freeze_Subprogram_Body
458 (Inst_Node
: Node_Id
;
460 Pack_Id
: Entity_Id
);
461 -- The generic body may appear textually after the instance, including
462 -- in the proper body of a stub, or within a different package instance.
463 -- Given that the instance can only be elaborated after the generic, we
464 -- place freeze_nodes for the instance and/or for packages that may enclose
465 -- the instance and the generic, so that the back-end can establish the
466 -- proper order of elaboration.
469 -- Establish environment for subsequent instantiation. Separated from
470 -- Save_Env because data-structures for visibility handling must be
471 -- initialized before call to Check_Generic_Child_Unit.
473 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
474 -- When compiling an instance of a child unit the parent (which is
475 -- itself an instance) is an enclosing scope that must be made
476 -- immediately visible. This procedure is also used to install the non-
477 -- generic parent of a generic child unit when compiling its body, so
478 -- that full views of types in the parent are made visible.
480 procedure Remove_Parent
(In_Body
: Boolean := False);
481 -- Reverse effect after instantiation of child is complete
483 procedure Inline_Instance_Body
485 Gen_Unit
: Entity_Id
;
487 -- If front-end inlining is requested, instantiate the package body,
488 -- and preserve the visibility of its compilation unit, to insure
489 -- that successive instantiations succeed.
491 -- The functions Instantiate_XXX perform various legality checks and build
492 -- the declarations for instantiated generic parameters. In all of these
493 -- Formal is the entity in the generic unit, Actual is the entity of
494 -- expression in the generic associations, and Analyzed_Formal is the
495 -- formal in the generic copy, which contains the semantic information to
496 -- be used to validate the actual.
498 function Instantiate_Object
501 Analyzed_Formal
: Node_Id
) return List_Id
;
503 function Instantiate_Type
506 Analyzed_Formal
: Node_Id
;
507 Actual_Decls
: List_Id
) return Node_Id
;
509 function Instantiate_Formal_Subprogram
512 Analyzed_Formal
: Node_Id
) return Node_Id
;
514 function Instantiate_Formal_Package
517 Analyzed_Formal
: Node_Id
) return List_Id
;
518 -- If the formal package is declared with a box, special visibility rules
519 -- apply to its formals: they are in the visible part of the package. This
520 -- is true in the declarative region of the formal package, that is to say
521 -- in the enclosing generic or instantiation. For an instantiation, the
522 -- parameters of the formal package are made visible in an explicit step.
523 -- Furthermore, if the actual is a visible use_clause, these formals must
524 -- be made potentially use_visible as well. On exit from the enclosing
525 -- instantiation, the reverse must be done.
527 -- For a formal package declared without a box, there are conformance rules
528 -- that apply to the actuals in the generic declaration and the actuals of
529 -- the actual package in the enclosing instantiation. The simplest way to
530 -- apply these rules is to repeat the instantiation of the formal package
531 -- in the context of the enclosing instance, and compare the generic
532 -- associations of this instantiation with those of the actual package.
534 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
535 -- Test if given node is in the main unit
537 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
);
538 -- If the generic appears in a separate non-generic library unit,
539 -- load the corresponding body to retrieve the body of the generic.
540 -- N is the node for the generic instantiation, Spec is the generic
541 -- package declaration.
543 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
544 -- Add the context clause of the unit containing a generic unit to
545 -- an instantiation that is a compilation unit.
547 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
548 -- In order to propagate semantic information back from the analyzed
549 -- copy to the original generic, we maintain links between selected nodes
550 -- in the generic and their corresponding copies. At the end of generic
551 -- analysis, the routine Save_Global_References traverses the generic
552 -- tree, examines the semantic information, and preserves the links to
553 -- those nodes that contain global information. At instantiation, the
554 -- information from the associated node is placed on the new copy, so
555 -- that name resolution is not repeated.
557 -- Three kinds of source nodes have associated nodes:
559 -- a) those that can reference (denote) entities, that is identifiers,
560 -- character literals, expanded_names, operator symbols, operators,
561 -- and attribute reference nodes. These nodes have an Entity field
562 -- and are the set of nodes that are in N_Has_Entity.
564 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
566 -- c) selected components (N_Selected_Component)
568 -- For the first class, the associated node preserves the entity if it is
569 -- global. If the generic contains nested instantiations, the associated
570 -- node itself has been recopied, and a chain of them must be followed.
572 -- For aggregates, the associated node allows retrieval of the type, which
573 -- may otherwise not appear in the generic. The view of this type may be
574 -- different between generic and instantiation, and the full view can be
575 -- installed before the instantiation is analyzed. For aggregates of
576 -- type extensions, the same view exchange may have to be performed for
577 -- some of the ancestor types, if their view is private at the point of
580 -- Nodes that are selected components in the parse tree may be rewritten
581 -- as expanded names after resolution, and must be treated as potential
582 -- entity holders. which is why they also have an Associated_Node.
584 -- Nodes that do not come from source, such as freeze nodes, do not appear
585 -- in the generic tree, and need not have an associated node.
587 -- The associated node is stored in the Associated_Node field. Note that
588 -- this field overlaps Entity, which is fine, because the whole point is
589 -- that we don't need or want the normal Entity field in this situation.
591 procedure Move_Freeze_Nodes
595 -- Freeze nodes can be generated in the analysis of a generic unit, but
596 -- will not be seen by the back-end. It is necessary to move those nodes
597 -- to the enclosing scope if they freeze an outer entity. We place them
598 -- at the end of the enclosing generic package, which is semantically
601 procedure Pre_Analyze_Actuals
(N
: Node_Id
);
602 -- Analyze actuals to perform name resolution. Full resolution is done
603 -- later, when the expected types are known, but names have to be captured
604 -- before installing parents of generics, that are not visible for the
605 -- actuals themselves.
607 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
608 -- Verify that an attribute that appears as the default for a formal
609 -- subprogram is a function or procedure with the correct profile.
611 -------------------------------------------
612 -- Data Structures for Generic Renamings --
613 -------------------------------------------
615 -- The map Generic_Renamings associates generic entities with their
616 -- corresponding actuals. Currently used to validate type instances.
617 -- It will eventually be used for all generic parameters to eliminate
618 -- the need for overload resolution in the instance.
620 type Assoc_Ptr
is new Int
;
622 Assoc_Null
: constant Assoc_Ptr
:= -1;
627 Next_In_HTable
: Assoc_Ptr
;
630 package Generic_Renamings
is new Table
.Table
631 (Table_Component_Type
=> Assoc
,
632 Table_Index_Type
=> Assoc_Ptr
,
633 Table_Low_Bound
=> 0,
635 Table_Increment
=> 100,
636 Table_Name
=> "Generic_Renamings");
638 -- Variable to hold enclosing instantiation. When the environment is
639 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
641 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
643 -- Hash table for associations
645 HTable_Size
: constant := 37;
646 type HTable_Range
is range 0 .. HTable_Size
- 1;
648 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
649 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
650 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
651 function Hash
(F
: Entity_Id
) return HTable_Range
;
653 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
654 Header_Num
=> HTable_Range
,
656 Elmt_Ptr
=> Assoc_Ptr
,
657 Null_Ptr
=> Assoc_Null
,
658 Set_Next
=> Set_Next_Assoc
,
661 Get_Key
=> Get_Gen_Id
,
665 Exchanged_Views
: Elist_Id
;
666 -- This list holds the private views that have been exchanged during
667 -- instantiation to restore the visibility of the generic declaration.
668 -- (see comments above). After instantiation, the current visibility is
669 -- reestablished by means of a traversal of this list.
671 Hidden_Entities
: Elist_Id
;
672 -- This list holds the entities of the current scope that are removed
673 -- from immediate visibility when instantiating a child unit. Their
674 -- visibility is restored in Remove_Parent.
676 -- Because instantiations can be recursive, the following must be saved
677 -- on entry and restored on exit from an instantiation (spec or body).
678 -- This is done by the two procedures Save_Env and Restore_Env. For
679 -- package and subprogram instantiations (but not for the body instances)
680 -- the action of Save_Env is done in two steps: Init_Env is called before
681 -- Check_Generic_Child_Unit, because setting the parent instances requires
682 -- that the visibility data structures be properly initialized. Once the
683 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
685 Parent_Unit_Visible
: Boolean := False;
686 -- Parent_Unit_Visible is used when the generic is a child unit, and
687 -- indicates whether the ultimate parent of the generic is visible in the
688 -- instantiation environment. It is used to reset the visiblity of the
689 -- parent at the end of the instantiation (see Remove_Parent).
691 type Instance_Env
is record
692 Ada_Version
: Ada_Version_Type
;
693 Ada_Version_Explicit
: Ada_Version_Type
;
694 Instantiated_Parent
: Assoc
;
695 Exchanged_Views
: Elist_Id
;
696 Hidden_Entities
: Elist_Id
;
697 Current_Sem_Unit
: Unit_Number_Type
;
698 Parent_Unit_Visible
: Boolean := False;
701 package Instance_Envs
is new Table
.Table
(
702 Table_Component_Type
=> Instance_Env
,
703 Table_Index_Type
=> Int
,
704 Table_Low_Bound
=> 0,
706 Table_Increment
=> 100,
707 Table_Name
=> "Instance_Envs");
709 procedure Restore_Private_Views
710 (Pack_Id
: Entity_Id
;
711 Is_Package
: Boolean := True);
712 -- Restore the private views of external types, and unmark the generic
713 -- renamings of actuals, so that they become comptible subtypes again.
714 -- For subprograms, Pack_Id is the package constructed to hold the
717 procedure Switch_View
(T
: Entity_Id
);
718 -- Switch the partial and full views of a type and its private
719 -- dependents (i.e. its subtypes and derived types).
721 ------------------------------------
722 -- Structures for Error Reporting --
723 ------------------------------------
725 Instantiation_Node
: Node_Id
;
726 -- Used by subprograms that validate instantiation of formal parameters
727 -- where there might be no actual on which to place the error message.
728 -- Also used to locate the instantiation node for generic subunits.
730 Instantiation_Error
: exception;
731 -- When there is a semantic error in the generic parameter matching,
732 -- there is no point in continuing the instantiation, because the
733 -- number of cascaded errors is unpredictable. This exception aborts
734 -- the instantiation process altogether.
736 S_Adjustment
: Sloc_Adjustment
;
737 -- Offset created for each node in an instantiation, in order to keep
738 -- track of the source position of the instantiation in each of its nodes.
739 -- A subsequent semantic error or warning on a construct of the instance
740 -- points to both places: the original generic node, and the point of
741 -- instantiation. See Sinput and Sinput.L for additional details.
743 ------------------------------------------------------------
744 -- Data structure for keeping track when inside a Generic --
745 ------------------------------------------------------------
747 -- The following table is used to save values of the Inside_A_Generic
748 -- flag (see spec of Sem) when they are saved by Start_Generic.
750 package Generic_Flags
is new Table
.Table
(
751 Table_Component_Type
=> Boolean,
752 Table_Index_Type
=> Int
,
753 Table_Low_Bound
=> 0,
755 Table_Increment
=> 200,
756 Table_Name
=> "Generic_Flags");
758 ---------------------------
759 -- Abandon_Instantiation --
760 ---------------------------
762 procedure Abandon_Instantiation
(N
: Node_Id
) is
764 Error_Msg_N
("instantiation abandoned!", N
);
765 raise Instantiation_Error
;
766 end Abandon_Instantiation
;
768 --------------------------
769 -- Analyze_Associations --
770 --------------------------
772 function Analyze_Associations
775 F_Copy
: List_Id
) return List_Id
777 Actual_Types
: constant Elist_Id
:= New_Elmt_List
;
778 Assoc
: constant List_Id
:= New_List
;
779 Defaults
: constant Elist_Id
:= New_Elmt_List
;
780 Gen_Unit
: constant Entity_Id
:= Defining_Entity
(Parent
(F_Copy
));
784 Next_Formal
: Node_Id
;
785 Temp_Formal
: Node_Id
;
786 Analyzed_Formal
: Node_Id
;
789 First_Named
: Node_Id
:= Empty
;
790 Found_Assoc
: Node_Id
;
791 Is_Named_Assoc
: Boolean;
792 Num_Matched
: Int
:= 0;
793 Num_Actuals
: Int
:= 0;
795 function Matching_Actual
797 A_F
: Entity_Id
) return Node_Id
;
798 -- Find actual that corresponds to a given a formal parameter. If the
799 -- actuals are positional, return the next one, if any. If the actuals
800 -- are named, scan the parameter associations to find the right one.
801 -- A_F is the corresponding entity in the analyzed generic,which is
802 -- placed on the selector name for ASIS use.
804 procedure Set_Analyzed_Formal
;
805 -- Find the node in the generic copy that corresponds to a given formal.
806 -- The semantic information on this node is used to perform legality
807 -- checks on the actuals. Because semantic analysis can introduce some
808 -- anonymous entities or modify the declaration node itself, the
809 -- correspondence between the two lists is not one-one. In addition to
810 -- anonymous types, the presence a formal equality will introduce an
811 -- implicit declaration for the corresponding inequality.
813 ---------------------
814 -- Matching_Actual --
815 ---------------------
817 function Matching_Actual
819 A_F
: Entity_Id
) return Node_Id
825 Is_Named_Assoc
:= False;
827 -- End of list of purely positional parameters
832 -- Case of positional parameter corresponding to current formal
834 elsif No
(Selector_Name
(Actual
)) then
835 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
836 Found_Assoc
:= Actual
;
837 Num_Matched
:= Num_Matched
+ 1;
840 -- Otherwise scan list of named actuals to find the one with the
841 -- desired name. All remaining actuals have explicit names.
844 Is_Named_Assoc
:= True;
848 while Present
(Actual
) loop
849 if Chars
(Selector_Name
(Actual
)) = Chars
(F
) then
850 Found
:= Explicit_Generic_Actual_Parameter
(Actual
);
851 Set_Entity
(Selector_Name
(Actual
), A_F
);
852 Set_Etype
(Selector_Name
(Actual
), Etype
(A_F
));
853 Generate_Reference
(A_F
, Selector_Name
(Actual
));
854 Found_Assoc
:= Actual
;
855 Num_Matched
:= Num_Matched
+ 1;
863 -- Reset for subsequent searches. In most cases the named
864 -- associations are in order. If they are not, we reorder them
865 -- to avoid scanning twice the same actual. This is not just a
866 -- question of efficiency: there may be multiple defaults with
867 -- boxes that have the same name. In a nested instantiation we
868 -- insert actuals for those defaults, and cannot rely on their
869 -- names to disambiguate them.
871 if Actual
= First_Named
then
874 elsif Present
(Actual
) then
875 Insert_Before
(First_Named
, Remove_Next
(Prev
));
878 Actual
:= First_Named
;
884 -------------------------
885 -- Set_Analyzed_Formal --
886 -------------------------
888 procedure Set_Analyzed_Formal
is
891 while Present
(Analyzed_Formal
) loop
892 Kind
:= Nkind
(Analyzed_Formal
);
894 case Nkind
(Formal
) is
896 when N_Formal_Subprogram_Declaration
=>
897 exit when Kind
in N_Formal_Subprogram_Declaration
900 (Defining_Unit_Name
(Specification
(Formal
))) =
902 (Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
904 when N_Formal_Package_Declaration
=>
906 Kind
= N_Formal_Package_Declaration
908 Kind
= N_Generic_Package_Declaration
;
910 when N_Use_Package_Clause | N_Use_Type_Clause
=> exit;
914 -- Skip freeze nodes, and nodes inserted to replace
915 -- unrecognized pragmas.
918 Kind
not in N_Formal_Subprogram_Declaration
919 and then Kind
/= N_Subprogram_Declaration
920 and then Kind
/= N_Freeze_Entity
921 and then Kind
/= N_Null_Statement
922 and then Kind
/= N_Itype_Reference
923 and then Chars
(Defining_Identifier
(Formal
)) =
924 Chars
(Defining_Identifier
(Analyzed_Formal
));
927 Next
(Analyzed_Formal
);
930 end Set_Analyzed_Formal
;
932 -- Start of processing for Analyze_Associations
935 -- If named associations are present, save the first named association
936 -- (it may of course be Empty) to facilitate subsequent name search.
938 Actuals
:= Generic_Associations
(I_Node
);
940 if Present
(Actuals
) then
941 First_Named
:= First
(Actuals
);
943 while Present
(First_Named
)
944 and then No
(Selector_Name
(First_Named
))
946 Num_Actuals
:= Num_Actuals
+ 1;
951 Named
:= First_Named
;
952 while Present
(Named
) loop
953 if No
(Selector_Name
(Named
)) then
954 Error_Msg_N
("invalid positional actual after named one", Named
);
955 Abandon_Instantiation
(Named
);
958 -- A named association may lack an actual parameter, if it was
959 -- introduced for a default subprogram that turns out to be local
960 -- to the outer instantiation.
962 if Present
(Explicit_Generic_Actual_Parameter
(Named
)) then
963 Num_Actuals
:= Num_Actuals
+ 1;
969 if Present
(Formals
) then
970 Formal
:= First_Non_Pragma
(Formals
);
971 Analyzed_Formal
:= First_Non_Pragma
(F_Copy
);
973 if Present
(Actuals
) then
974 Actual
:= First
(Actuals
);
976 -- All formals should have default values
982 while Present
(Formal
) loop
984 Next_Formal
:= Next_Non_Pragma
(Formal
);
986 case Nkind
(Formal
) is
987 when N_Formal_Object_Declaration
=>
990 Defining_Identifier
(Formal
),
991 Defining_Identifier
(Analyzed_Formal
));
994 (Instantiate_Object
(Formal
, Match
, Analyzed_Formal
),
997 when N_Formal_Type_Declaration
=>
1000 Defining_Identifier
(Formal
),
1001 Defining_Identifier
(Analyzed_Formal
));
1004 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1007 Instantiation_Node
, Defining_Identifier
(Formal
));
1008 Error_Msg_NE
("\in instantiation of & declared#",
1009 Instantiation_Node
, Gen_Unit
);
1010 Abandon_Instantiation
(Instantiation_Node
);
1016 (Formal
, Match
, Analyzed_Formal
, Assoc
));
1018 -- an instantiation is a freeze point for the actuals,
1019 -- unless this is a rewritten formal package.
1021 if Nkind
(I_Node
) /= N_Formal_Package_Declaration
then
1022 Append_Elmt
(Entity
(Match
), Actual_Types
);
1026 -- A remote access-to-class-wide type must not be an
1027 -- actual parameter for a generic formal of an access
1028 -- type (E.2.2 (17)).
1030 if Nkind
(Analyzed_Formal
) = N_Formal_Type_Declaration
1032 Nkind
(Formal_Type_Definition
(Analyzed_Formal
)) =
1033 N_Access_To_Object_Definition
1035 Validate_Remote_Access_To_Class_Wide_Type
(Match
);
1038 when N_Formal_Subprogram_Declaration
=>
1041 Defining_Unit_Name
(Specification
(Formal
)),
1042 Defining_Unit_Name
(Specification
(Analyzed_Formal
)));
1044 -- If the formal subprogram has the same name as
1045 -- another formal subprogram of the generic, then
1046 -- a named association is illegal (12.3(9)). Exclude
1047 -- named associations that are generated for a nested
1051 and then Is_Named_Assoc
1052 and then Comes_From_Source
(Found_Assoc
)
1054 Temp_Formal
:= First
(Formals
);
1055 while Present
(Temp_Formal
) loop
1056 if Nkind
(Temp_Formal
) in
1057 N_Formal_Subprogram_Declaration
1058 and then Temp_Formal
/= Formal
1060 Chars
(Selector_Name
(Found_Assoc
)) =
1061 Chars
(Defining_Unit_Name
1062 (Specification
(Temp_Formal
)))
1065 ("name not allowed for overloaded formal",
1067 Abandon_Instantiation
(Instantiation_Node
);
1075 Instantiate_Formal_Subprogram
1076 (Formal
, Match
, Analyzed_Formal
));
1079 and then Box_Present
(Formal
)
1082 (Defining_Unit_Name
(Specification
(Last
(Assoc
))),
1086 when N_Formal_Package_Declaration
=>
1089 Defining_Identifier
(Formal
),
1090 Defining_Identifier
(Original_Node
(Analyzed_Formal
)));
1093 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1096 Instantiation_Node
, Defining_Identifier
(Formal
));
1097 Error_Msg_NE
("\in instantiation of & declared#",
1098 Instantiation_Node
, Gen_Unit
);
1100 Abandon_Instantiation
(Instantiation_Node
);
1105 (Instantiate_Formal_Package
1106 (Formal
, Match
, Analyzed_Formal
),
1110 -- For use type and use package appearing in the context
1111 -- clause, we have already copied them, so we can just
1112 -- move them where they belong (we mustn't recopy them
1113 -- since this would mess up the Sloc values).
1115 when N_Use_Package_Clause |
1116 N_Use_Type_Clause
=>
1118 Append
(Formal
, Assoc
);
1121 raise Program_Error
;
1125 Formal
:= Next_Formal
;
1126 Next_Non_Pragma
(Analyzed_Formal
);
1129 if Num_Actuals
> Num_Matched
then
1130 Error_Msg_Sloc
:= Sloc
(Gen_Unit
);
1132 if Present
(Selector_Name
(Actual
)) then
1134 ("unmatched actual&",
1135 Actual
, Selector_Name
(Actual
));
1136 Error_Msg_NE
("\in instantiation of& declared#",
1140 ("unmatched actual in instantiation of& declared#",
1145 elsif Present
(Actuals
) then
1147 ("too many actuals in generic instantiation", Instantiation_Node
);
1151 Elmt
: Elmt_Id
:= First_Elmt
(Actual_Types
);
1154 while Present
(Elmt
) loop
1155 Freeze_Before
(I_Node
, Node
(Elmt
));
1160 -- If there are default subprograms, normalize the tree by adding
1161 -- explicit associations for them. This is required if the instance
1162 -- appears within a generic.
1170 Elmt
:= First_Elmt
(Defaults
);
1171 while Present
(Elmt
) loop
1172 if No
(Actuals
) then
1173 Actuals
:= New_List
;
1174 Set_Generic_Associations
(I_Node
, Actuals
);
1177 Subp
:= Node
(Elmt
);
1179 Make_Generic_Association
(Sloc
(Subp
),
1180 Selector_Name
=> New_Occurrence_Of
(Subp
, Sloc
(Subp
)),
1181 Explicit_Generic_Actual_Parameter
=>
1182 New_Occurrence_Of
(Subp
, Sloc
(Subp
)));
1183 Mark_Rewrite_Insertion
(New_D
);
1184 Append_To
(Actuals
, New_D
);
1190 end Analyze_Associations
;
1192 -------------------------------
1193 -- Analyze_Formal_Array_Type --
1194 -------------------------------
1196 procedure Analyze_Formal_Array_Type
1197 (T
: in out Entity_Id
;
1203 -- Treated like a non-generic array declaration, with
1204 -- additional semantic checks.
1208 if Nkind
(Def
) = N_Constrained_Array_Definition
then
1209 DSS
:= First
(Discrete_Subtype_Definitions
(Def
));
1210 while Present
(DSS
) loop
1211 if Nkind
(DSS
) = N_Subtype_Indication
1212 or else Nkind
(DSS
) = N_Range
1213 or else Nkind
(DSS
) = N_Attribute_Reference
1215 Error_Msg_N
("only a subtype mark is allowed in a formal", DSS
);
1222 Array_Type_Declaration
(T
, Def
);
1223 Set_Is_Generic_Type
(Base_Type
(T
));
1225 if Ekind
(Component_Type
(T
)) = E_Incomplete_Type
1226 and then No
(Full_View
(Component_Type
(T
)))
1228 Error_Msg_N
("premature usage of incomplete type", Def
);
1230 -- Check that range constraint is not allowed on the component type
1231 -- of a generic formal array type (AARM 12.5.3(3))
1233 elsif Is_Internal
(Component_Type
(T
))
1234 and then Present
(Subtype_Indication
(Component_Definition
(Def
)))
1235 and then Nkind
(Original_Node
1236 (Subtype_Indication
(Component_Definition
(Def
))))
1237 = N_Subtype_Indication
1240 ("in a formal, a subtype indication can only be "
1241 & "a subtype mark ('R'M 12.5.3(3))",
1242 Subtype_Indication
(Component_Definition
(Def
)));
1245 end Analyze_Formal_Array_Type
;
1247 ---------------------------------------------
1248 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1249 ---------------------------------------------
1251 -- As for other generic types, we create a valid type representation
1252 -- with legal but arbitrary attributes, whose values are never considered
1253 -- static. For all scalar types we introduce an anonymous base type, with
1254 -- the same attributes. We choose the corresponding integer type to be
1255 -- Standard_Integer.
1257 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1261 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1262 Base
: constant Entity_Id
:=
1264 (E_Decimal_Fixed_Point_Type
,
1265 Current_Scope
, Sloc
(Def
), 'G');
1266 Int_Base
: constant Entity_Id
:= Standard_Integer
;
1267 Delta_Val
: constant Ureal
:= Ureal_1
;
1268 Digs_Val
: constant Uint
:= Uint_6
;
1273 Set_Etype
(Base
, Base
);
1274 Set_Size_Info
(Base
, Int_Base
);
1275 Set_RM_Size
(Base
, RM_Size
(Int_Base
));
1276 Set_First_Rep_Item
(Base
, First_Rep_Item
(Int_Base
));
1277 Set_Digits_Value
(Base
, Digs_Val
);
1278 Set_Delta_Value
(Base
, Delta_Val
);
1279 Set_Small_Value
(Base
, Delta_Val
);
1280 Set_Scalar_Range
(Base
,
1282 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1283 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1285 Set_Is_Generic_Type
(Base
);
1286 Set_Parent
(Base
, Parent
(Def
));
1288 Set_Ekind
(T
, E_Decimal_Fixed_Point_Subtype
);
1289 Set_Etype
(T
, Base
);
1290 Set_Size_Info
(T
, Int_Base
);
1291 Set_RM_Size
(T
, RM_Size
(Int_Base
));
1292 Set_First_Rep_Item
(T
, First_Rep_Item
(Int_Base
));
1293 Set_Digits_Value
(T
, Digs_Val
);
1294 Set_Delta_Value
(T
, Delta_Val
);
1295 Set_Small_Value
(T
, Delta_Val
);
1296 Set_Scalar_Range
(T
, Scalar_Range
(Base
));
1297 Set_Is_Constrained
(T
);
1299 Check_Restriction
(No_Fixed_Point
, Def
);
1300 end Analyze_Formal_Decimal_Fixed_Point_Type
;
1302 ---------------------------------
1303 -- Analyze_Formal_Derived_Type --
1304 ---------------------------------
1306 procedure Analyze_Formal_Derived_Type
1311 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1312 Unk_Disc
: constant Boolean := Unknown_Discriminants_Present
(N
);
1316 Set_Is_Generic_Type
(T
);
1318 if Private_Present
(Def
) then
1320 Make_Private_Extension_Declaration
(Loc
,
1321 Defining_Identifier
=> T
,
1322 Discriminant_Specifications
=> Discriminant_Specifications
(N
),
1323 Unknown_Discriminants_Present
=> Unk_Disc
,
1324 Subtype_Indication
=> Subtype_Mark
(Def
));
1326 Set_Abstract_Present
(New_N
, Abstract_Present
(Def
));
1330 Make_Full_Type_Declaration
(Loc
,
1331 Defining_Identifier
=> T
,
1332 Discriminant_Specifications
=>
1333 Discriminant_Specifications
(Parent
(T
)),
1335 Make_Derived_Type_Definition
(Loc
,
1336 Subtype_Indication
=> Subtype_Mark
(Def
)));
1338 Set_Abstract_Present
1339 (Type_Definition
(New_N
), Abstract_Present
(Def
));
1346 if not Is_Composite_Type
(T
) then
1348 ("unknown discriminants not allowed for elementary types", N
);
1350 Set_Has_Unknown_Discriminants
(T
);
1351 Set_Is_Constrained
(T
, False);
1355 -- If the parent type has a known size, so does the formal, which
1356 -- makes legal representation clauses that involve the formal.
1358 Set_Size_Known_At_Compile_Time
1359 (T
, Size_Known_At_Compile_Time
(Entity
(Subtype_Mark
(Def
))));
1361 end Analyze_Formal_Derived_Type
;
1363 ----------------------------------
1364 -- Analyze_Formal_Discrete_Type --
1365 ----------------------------------
1367 -- The operations defined for a discrete types are those of an
1368 -- enumeration type. The size is set to an arbitrary value, for use
1369 -- in analyzing the generic unit.
1371 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1372 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1376 Base
: constant Entity_Id
:=
1378 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1381 Set_Ekind
(T
, E_Enumeration_Subtype
);
1382 Set_Etype
(T
, Base
);
1385 Set_Is_Generic_Type
(T
);
1386 Set_Is_Constrained
(T
);
1388 -- For semantic analysis, the bounds of the type must be set to some
1389 -- non-static value. The simplest is to create attribute nodes for
1390 -- those bounds, that refer to the type itself. These bounds are never
1391 -- analyzed but serve as place-holders.
1394 Make_Attribute_Reference
(Loc
,
1395 Attribute_Name
=> Name_First
,
1396 Prefix
=> New_Reference_To
(T
, Loc
));
1400 Make_Attribute_Reference
(Loc
,
1401 Attribute_Name
=> Name_Last
,
1402 Prefix
=> New_Reference_To
(T
, Loc
));
1405 Set_Scalar_Range
(T
,
1410 Set_Ekind
(Base
, E_Enumeration_Type
);
1411 Set_Etype
(Base
, Base
);
1412 Init_Size
(Base
, 8);
1413 Init_Alignment
(Base
);
1414 Set_Is_Generic_Type
(Base
);
1415 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1416 Set_Parent
(Base
, Parent
(Def
));
1418 end Analyze_Formal_Discrete_Type
;
1420 ----------------------------------
1421 -- Analyze_Formal_Floating_Type --
1422 ---------------------------------
1424 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1425 Base
: constant Entity_Id
:=
1427 (E_Floating_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1430 -- The various semantic attributes are taken from the predefined type
1431 -- Float, just so that all of them are initialized. Their values are
1432 -- never used because no constant folding or expansion takes place in
1433 -- the generic itself.
1436 Set_Ekind
(T
, E_Floating_Point_Subtype
);
1437 Set_Etype
(T
, Base
);
1438 Set_Size_Info
(T
, (Standard_Float
));
1439 Set_RM_Size
(T
, RM_Size
(Standard_Float
));
1440 Set_Digits_Value
(T
, Digits_Value
(Standard_Float
));
1441 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Float
));
1442 Set_Is_Constrained
(T
);
1444 Set_Is_Generic_Type
(Base
);
1445 Set_Etype
(Base
, Base
);
1446 Set_Size_Info
(Base
, (Standard_Float
));
1447 Set_RM_Size
(Base
, RM_Size
(Standard_Float
));
1448 Set_Digits_Value
(Base
, Digits_Value
(Standard_Float
));
1449 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Float
));
1450 Set_Parent
(Base
, Parent
(Def
));
1452 Check_Restriction
(No_Floating_Point
, Def
);
1453 end Analyze_Formal_Floating_Type
;
1455 ---------------------------------
1456 -- Analyze_Formal_Modular_Type --
1457 ---------------------------------
1459 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
) is
1461 -- Apart from their entity kind, generic modular types are treated
1462 -- like signed integer types, and have the same attributes.
1464 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
1465 Set_Ekind
(T
, E_Modular_Integer_Subtype
);
1466 Set_Ekind
(Etype
(T
), E_Modular_Integer_Type
);
1468 end Analyze_Formal_Modular_Type
;
1470 ---------------------------------------
1471 -- Analyze_Formal_Object_Declaration --
1472 ---------------------------------------
1474 procedure Analyze_Formal_Object_Declaration
(N
: Node_Id
) is
1475 E
: constant Node_Id
:= Expression
(N
);
1476 Id
: constant Node_Id
:= Defining_Identifier
(N
);
1483 -- Determine the mode of the formal object
1485 if Out_Present
(N
) then
1486 K
:= E_Generic_In_Out_Parameter
;
1488 if not In_Present
(N
) then
1489 Error_Msg_N
("formal generic objects cannot have mode OUT", N
);
1493 K
:= E_Generic_In_Parameter
;
1496 Find_Type
(Subtype_Mark
(N
));
1497 T
:= Entity
(Subtype_Mark
(N
));
1499 if Ekind
(T
) = E_Incomplete_Type
then
1500 Error_Msg_N
("premature usage of incomplete type", Subtype_Mark
(N
));
1503 if K
= E_Generic_In_Parameter
then
1505 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1507 if Ada_Version
< Ada_05
and then Is_Limited_Type
(T
) then
1509 ("generic formal of mode IN must not be of limited type", N
);
1510 Explain_Limited_Type
(T
, N
);
1513 if Is_Abstract
(T
) then
1515 ("generic formal of mode IN must not be of abstract type", N
);
1519 Analyze_Per_Use_Expression
(E
, T
);
1525 -- Case of generic IN OUT parameter
1528 -- If the formal has an unconstrained type, construct its
1529 -- actual subtype, as is done for subprogram formals. In this
1530 -- fashion, all its uses can refer to specific bounds.
1535 if (Is_Array_Type
(T
)
1536 and then not Is_Constrained
(T
))
1538 (Ekind
(T
) = E_Record_Type
1539 and then Has_Discriminants
(T
))
1542 Non_Freezing_Ref
: constant Node_Id
:=
1543 New_Reference_To
(Id
, Sloc
(Id
));
1547 -- Make sure that the actual subtype doesn't generate
1550 Set_Must_Not_Freeze
(Non_Freezing_Ref
);
1551 Decl
:= Build_Actual_Subtype
(T
, Non_Freezing_Ref
);
1552 Insert_Before_And_Analyze
(N
, Decl
);
1553 Set_Actual_Subtype
(Id
, Defining_Identifier
(Decl
));
1556 Set_Actual_Subtype
(Id
, T
);
1561 ("initialization not allowed for `IN OUT` formals", N
);
1565 end Analyze_Formal_Object_Declaration
;
1567 ----------------------------------------------
1568 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1569 ----------------------------------------------
1571 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1575 Loc
: constant Source_Ptr
:= Sloc
(Def
);
1576 Base
: constant Entity_Id
:=
1578 (E_Ordinary_Fixed_Point_Type
, Current_Scope
, Sloc
(Def
), 'G');
1580 -- The semantic attributes are set for completeness only, their
1581 -- values will never be used, because all properties of the type
1585 Set_Ekind
(T
, E_Ordinary_Fixed_Point_Subtype
);
1586 Set_Etype
(T
, Base
);
1587 Set_Size_Info
(T
, Standard_Integer
);
1588 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1589 Set_Small_Value
(T
, Ureal_1
);
1590 Set_Delta_Value
(T
, Ureal_1
);
1591 Set_Scalar_Range
(T
,
1593 Low_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
),
1594 High_Bound
=> Make_Real_Literal
(Loc
, Ureal_1
)));
1595 Set_Is_Constrained
(T
);
1597 Set_Is_Generic_Type
(Base
);
1598 Set_Etype
(Base
, Base
);
1599 Set_Size_Info
(Base
, Standard_Integer
);
1600 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1601 Set_Small_Value
(Base
, Ureal_1
);
1602 Set_Delta_Value
(Base
, Ureal_1
);
1603 Set_Scalar_Range
(Base
, Scalar_Range
(T
));
1604 Set_Parent
(Base
, Parent
(Def
));
1606 Check_Restriction
(No_Fixed_Point
, Def
);
1607 end Analyze_Formal_Ordinary_Fixed_Point_Type
;
1609 ----------------------------
1610 -- Analyze_Formal_Package --
1611 ----------------------------
1613 procedure Analyze_Formal_Package
(N
: Node_Id
) is
1614 Loc
: constant Source_Ptr
:= Sloc
(N
);
1615 Pack_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1617 Gen_Id
: constant Node_Id
:= Name
(N
);
1619 Gen_Unit
: Entity_Id
;
1621 Parent_Installed
: Boolean := False;
1623 Parent_Instance
: Entity_Id
;
1624 Renaming_In_Par
: Entity_Id
;
1627 Text_IO_Kludge
(Gen_Id
);
1630 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
1631 Gen_Unit
:= Entity
(Gen_Id
);
1633 if Ekind
(Gen_Unit
) /= E_Generic_Package
then
1634 Error_Msg_N
("expect generic package name", Gen_Id
);
1638 elsif Gen_Unit
= Current_Scope
then
1640 ("generic package cannot be used as a formal package of itself",
1645 elsif In_Open_Scopes
(Gen_Unit
) then
1646 if Is_Compilation_Unit
(Gen_Unit
)
1647 and then Is_Child_Unit
(Current_Scope
)
1649 -- Special-case the error when the formal is a parent, and
1650 -- continue analysis to minimize cascaded errors.
1653 ("generic parent cannot be used as formal package "
1654 & "of a child unit",
1659 ("generic package cannot be used as a formal package "
1667 -- Check for a formal package that is a package renaming
1669 if Present
(Renamed_Object
(Gen_Unit
)) then
1670 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
1673 -- The formal package is treated like a regular instance, but only
1674 -- the specification needs to be instantiated, to make entities visible.
1676 if not Box_Present
(N
) then
1677 Hidden_Entities
:= New_Elmt_List
;
1678 Analyze_Package_Instantiation
(N
);
1680 if Parent_Installed
then
1685 -- If there are no generic associations, the generic parameters
1686 -- appear as local entities and are instantiated like them. We copy
1687 -- the generic package declaration as if it were an instantiation,
1688 -- and analyze it like a regular package, except that we treat the
1689 -- formals as additional visible components.
1691 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
1693 if In_Extended_Main_Source_Unit
(N
) then
1694 Set_Is_Instantiated
(Gen_Unit
);
1695 Generate_Reference
(Gen_Unit
, N
);
1698 Formal
:= New_Copy
(Pack_Id
);
1699 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
1703 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
1705 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
1706 Set_Instance_Env
(Gen_Unit
, Formal
);
1708 Enter_Name
(Formal
);
1709 Set_Ekind
(Formal
, E_Generic_Package
);
1710 Set_Etype
(Formal
, Standard_Void_Type
);
1711 Set_Inner_Instances
(Formal
, New_Elmt_List
);
1714 -- Within the formal, the name of the generic package is a renaming
1715 -- of the formal (as for a regular instantiation).
1717 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1718 Defining_Unit_Name
=>
1719 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1720 Name
=> New_Reference_To
(Formal
, Loc
));
1722 if Present
(Visible_Declarations
(Specification
(N
))) then
1723 Prepend
(Renaming
, To
=> Visible_Declarations
(Specification
(N
)));
1724 elsif Present
(Private_Declarations
(Specification
(N
))) then
1725 Prepend
(Renaming
, To
=> Private_Declarations
(Specification
(N
)));
1728 if Is_Child_Unit
(Gen_Unit
)
1729 and then Parent_Installed
1731 -- Similarly, we have to make the name of the formal visible in
1732 -- the parent instance, to resolve properly fully qualified names
1733 -- that may appear in the generic unit. The parent instance has
1734 -- been placed on the scope stack ahead of the current scope.
1736 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
1739 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
1740 Set_Ekind
(Renaming_In_Par
, E_Package
);
1741 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
1742 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
1743 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
1744 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
1745 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
1748 Analyze_Generic_Formal_Part
(N
);
1749 Analyze
(Specification
(N
));
1750 End_Package_Scope
(Formal
);
1752 if Parent_Installed
then
1758 -- Inside the generic unit, the formal package is a regular
1759 -- package, but no body is needed for it. Note that after
1760 -- instantiation, the defining_unit_name we need is in the
1761 -- new tree and not in the original. (see Package_Instantiation).
1762 -- A generic formal package is an instance, and can be used as
1763 -- an actual for an inner instance. Mark its generic parent.
1765 Set_Ekind
(Formal
, E_Package
);
1766 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
1767 Set_Has_Completion
(Formal
, True);
1769 Set_Ekind
(Pack_Id
, E_Package
);
1770 Set_Etype
(Pack_Id
, Standard_Void_Type
);
1771 Set_Scope
(Pack_Id
, Scope
(Formal
));
1772 Set_Has_Completion
(Pack_Id
, True);
1774 end Analyze_Formal_Package
;
1776 ---------------------------------
1777 -- Analyze_Formal_Private_Type --
1778 ---------------------------------
1780 procedure Analyze_Formal_Private_Type
1786 New_Private_Type
(N
, T
, Def
);
1788 -- Set the size to an arbitrary but legal value
1790 Set_Size_Info
(T
, Standard_Integer
);
1791 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1792 end Analyze_Formal_Private_Type
;
1794 ----------------------------------------
1795 -- Analyze_Formal_Signed_Integer_Type --
1796 ----------------------------------------
1798 procedure Analyze_Formal_Signed_Integer_Type
1802 Base
: constant Entity_Id
:=
1804 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
1809 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
1810 Set_Etype
(T
, Base
);
1811 Set_Size_Info
(T
, Standard_Integer
);
1812 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1813 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
1814 Set_Is_Constrained
(T
);
1816 Set_Is_Generic_Type
(Base
);
1817 Set_Size_Info
(Base
, Standard_Integer
);
1818 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1819 Set_Etype
(Base
, Base
);
1820 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
1821 Set_Parent
(Base
, Parent
(Def
));
1822 end Analyze_Formal_Signed_Integer_Type
;
1824 -------------------------------
1825 -- Analyze_Formal_Subprogram --
1826 -------------------------------
1828 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
1829 Spec
: constant Node_Id
:= Specification
(N
);
1830 Def
: constant Node_Id
:= Default_Name
(N
);
1831 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
1839 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
1840 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
1844 Analyze_Subprogram_Declaration
(N
);
1845 Set_Is_Formal_Subprogram
(Nam
);
1846 Set_Has_Completion
(Nam
);
1848 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
1849 Set_Is_Abstract
(Nam
);
1850 Set_Is_Dispatching_Operation
(Nam
);
1853 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
1856 if not Present
(Ctrl_Type
) then
1858 ("abstract formal subprogram must have a controlling type",
1862 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
1867 -- Default name is resolved at the point of instantiation
1869 if Box_Present
(N
) then
1872 -- Else default is bound at the point of generic declaration
1874 elsif Present
(Def
) then
1875 if Nkind
(Def
) = N_Operator_Symbol
then
1876 Find_Direct_Name
(Def
);
1878 elsif Nkind
(Def
) /= N_Attribute_Reference
then
1882 -- For an attribute reference, analyze the prefix and verify
1883 -- that it has the proper profile for the subprogram.
1885 Analyze
(Prefix
(Def
));
1886 Valid_Default_Attribute
(Nam
, Def
);
1890 -- Default name may be overloaded, in which case the interpretation
1891 -- with the correct profile must be selected, as for a renaming.
1893 if Etype
(Def
) = Any_Type
then
1896 elsif Nkind
(Def
) = N_Selected_Component
then
1897 Subp
:= Entity
(Selector_Name
(Def
));
1899 if Ekind
(Subp
) /= E_Entry
then
1900 Error_Msg_N
("expect valid subprogram name as default", Def
);
1904 elsif Nkind
(Def
) = N_Indexed_Component
then
1906 if Nkind
(Prefix
(Def
)) /= N_Selected_Component
then
1907 Error_Msg_N
("expect valid subprogram name as default", Def
);
1911 Subp
:= Entity
(Selector_Name
(Prefix
(Def
)));
1913 if Ekind
(Subp
) /= E_Entry_Family
then
1914 Error_Msg_N
("expect valid subprogram name as default", Def
);
1919 elsif Nkind
(Def
) = N_Character_Literal
then
1921 -- Needs some type checks: subprogram should be parameterless???
1923 Resolve
(Def
, (Etype
(Nam
)));
1925 elsif not Is_Entity_Name
(Def
)
1926 or else not Is_Overloadable
(Entity
(Def
))
1928 Error_Msg_N
("expect valid subprogram name as default", Def
);
1931 elsif not Is_Overloaded
(Def
) then
1932 Subp
:= Entity
(Def
);
1935 Error_Msg_N
("premature usage of formal subprogram", Def
);
1937 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
1938 Error_Msg_N
("no visible entity matches specification", Def
);
1944 I1
: Interp_Index
:= 0;
1950 Get_First_Interp
(Def
, I
, It
);
1951 while Present
(It
.Nam
) loop
1953 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
1954 if Subp
/= Any_Id
then
1955 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
1957 if It1
= No_Interp
then
1958 Error_Msg_N
("ambiguous default subprogram", Def
);
1971 Get_Next_Interp
(I
, It
);
1975 if Subp
/= Any_Id
then
1976 Set_Entity
(Def
, Subp
);
1979 Error_Msg_N
("premature usage of formal subprogram", Def
);
1981 elsif Ekind
(Subp
) /= E_Operator
then
1982 Check_Mode_Conformant
(Subp
, Nam
);
1986 Error_Msg_N
("no visible subprogram matches specification", N
);
1990 end Analyze_Formal_Subprogram
;
1992 -------------------------------------
1993 -- Analyze_Formal_Type_Declaration --
1994 -------------------------------------
1996 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
1997 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
2001 T
:= Defining_Identifier
(N
);
2003 if Present
(Discriminant_Specifications
(N
))
2004 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2007 ("discriminants not allowed for this formal type",
2008 Defining_Identifier
(First
(Discriminant_Specifications
(N
))));
2011 -- Enter the new name, and branch to specific routine
2014 when N_Formal_Private_Type_Definition
=>
2015 Analyze_Formal_Private_Type
(N
, T
, Def
);
2017 when N_Formal_Derived_Type_Definition
=>
2018 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2020 when N_Formal_Discrete_Type_Definition
=>
2021 Analyze_Formal_Discrete_Type
(T
, Def
);
2023 when N_Formal_Signed_Integer_Type_Definition
=>
2024 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2026 when N_Formal_Modular_Type_Definition
=>
2027 Analyze_Formal_Modular_Type
(T
, Def
);
2029 when N_Formal_Floating_Point_Definition
=>
2030 Analyze_Formal_Floating_Type
(T
, Def
);
2032 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2033 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2035 when N_Formal_Decimal_Fixed_Point_Definition
=>
2036 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2038 when N_Array_Type_Definition
=>
2039 Analyze_Formal_Array_Type
(T
, Def
);
2041 when N_Access_To_Object_Definition |
2042 N_Access_Function_Definition |
2043 N_Access_Procedure_Definition
=>
2044 Analyze_Generic_Access_Type
(T
, Def
);
2050 raise Program_Error
;
2054 Set_Is_Generic_Type
(T
);
2055 end Analyze_Formal_Type_Declaration
;
2057 ------------------------------------
2058 -- Analyze_Function_Instantiation --
2059 ------------------------------------
2061 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2063 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2064 end Analyze_Function_Instantiation
;
2066 ---------------------------------
2067 -- Analyze_Generic_Access_Type --
2068 ---------------------------------
2070 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2074 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2075 Access_Type_Declaration
(T
, Def
);
2077 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2078 and then No
(Full_View
(Designated_Type
(T
)))
2079 and then not Is_Generic_Type
(Designated_Type
(T
))
2081 Error_Msg_N
("premature usage of incomplete type", Def
);
2083 elsif Is_Internal
(Designated_Type
(T
)) then
2085 ("only a subtype mark is allowed in a formal", Def
);
2089 Access_Subprogram_Declaration
(T
, Def
);
2091 end Analyze_Generic_Access_Type
;
2093 ---------------------------------
2094 -- Analyze_Generic_Formal_Part --
2095 ---------------------------------
2097 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2098 Gen_Parm_Decl
: Node_Id
;
2101 -- The generic formals are processed in the scope of the generic
2102 -- unit, where they are immediately visible. The scope is installed
2105 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2107 while Present
(Gen_Parm_Decl
) loop
2108 Analyze
(Gen_Parm_Decl
);
2109 Next
(Gen_Parm_Decl
);
2112 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2113 end Analyze_Generic_Formal_Part
;
2115 ------------------------------------------
2116 -- Analyze_Generic_Package_Declaration --
2117 ------------------------------------------
2119 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2120 Loc
: constant Source_Ptr
:= Sloc
(N
);
2123 Save_Parent
: Node_Id
;
2125 Decls
: constant List_Id
:=
2126 Visible_Declarations
(Specification
(N
));
2130 -- We introduce a renaming of the enclosing package, to have a usable
2131 -- entity as the prefix of an expanded name for a local entity of the
2132 -- form Par.P.Q, where P is the generic package. This is because a local
2133 -- entity named P may hide it, so that the usual visibility rules in
2134 -- the instance will not resolve properly.
2137 Make_Package_Renaming_Declaration
(Loc
,
2138 Defining_Unit_Name
=>
2139 Make_Defining_Identifier
(Loc
,
2140 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2141 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2143 if Present
(Decls
) then
2144 Decl
:= First
(Decls
);
2145 while Present
(Decl
)
2146 and then Nkind
(Decl
) = N_Pragma
2151 if Present
(Decl
) then
2152 Insert_Before
(Decl
, Renaming
);
2154 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2158 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2161 -- Create copy of generic unit, and save for instantiation.
2162 -- If the unit is a child unit, do not copy the specifications
2163 -- for the parent, which are not part of the generic tree.
2165 Save_Parent
:= Parent_Spec
(N
);
2166 Set_Parent_Spec
(N
, Empty
);
2168 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2169 Set_Parent_Spec
(New_N
, Save_Parent
);
2171 Id
:= Defining_Entity
(N
);
2172 Generate_Definition
(Id
);
2174 -- Expansion is not applied to generic units
2179 Set_Ekind
(Id
, E_Generic_Package
);
2180 Set_Etype
(Id
, Standard_Void_Type
);
2182 Enter_Generic_Scope
(Id
);
2183 Set_Inner_Instances
(Id
, New_Elmt_List
);
2185 Set_Categorization_From_Pragmas
(N
);
2186 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2188 -- Link the declaration of the generic homonym in the generic copy
2189 -- to the package it renames, so that it is always resolved properly.
2191 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2192 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2194 -- For a library unit, we have reconstructed the entity for the
2195 -- unit, and must reset it in the library tables.
2197 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2198 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2201 Analyze_Generic_Formal_Part
(N
);
2203 -- After processing the generic formals, analysis proceeds
2204 -- as for a non-generic package.
2206 Analyze
(Specification
(N
));
2208 Validate_Categorization_Dependency
(N
, Id
);
2212 End_Package_Scope
(Id
);
2213 Exit_Generic_Scope
(Id
);
2215 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2216 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2217 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2218 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2221 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2222 Validate_RT_RAT_Component
(N
);
2224 -- If this is a spec without a body, check that generic parameters
2227 if not Body_Required
(Parent
(N
)) then
2228 Check_References
(Id
);
2231 end Analyze_Generic_Package_Declaration
;
2233 --------------------------------------------
2234 -- Analyze_Generic_Subprogram_Declaration --
2235 --------------------------------------------
2237 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2242 Result_Type
: Entity_Id
;
2243 Save_Parent
: Node_Id
;
2246 -- Create copy of generic unit,and save for instantiation.
2247 -- If the unit is a child unit, do not copy the specifications
2248 -- for the parent, which are not part of the generic tree.
2250 Save_Parent
:= Parent_Spec
(N
);
2251 Set_Parent_Spec
(N
, Empty
);
2253 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2254 Set_Parent_Spec
(New_N
, Save_Parent
);
2257 Spec
:= Specification
(N
);
2258 Id
:= Defining_Entity
(Spec
);
2259 Generate_Definition
(Id
);
2261 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2263 ("operator symbol not allowed for generic subprogram", Id
);
2270 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2272 Enter_Generic_Scope
(Id
);
2273 Set_Inner_Instances
(Id
, New_Elmt_List
);
2274 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2276 Analyze_Generic_Formal_Part
(N
);
2278 Formals
:= Parameter_Specifications
(Spec
);
2280 if Present
(Formals
) then
2281 Process_Formals
(Formals
, Spec
);
2284 if Nkind
(Spec
) = N_Function_Specification
then
2285 Set_Ekind
(Id
, E_Generic_Function
);
2287 if Nkind
(Result_Definition
(Spec
)) = N_Access_Definition
then
2288 Result_Type
:= Access_Definition
(Spec
, Result_Definition
(Spec
));
2289 Set_Etype
(Id
, Result_Type
);
2291 Find_Type
(Result_Definition
(Spec
));
2292 Set_Etype
(Id
, Entity
(Result_Definition
(Spec
)));
2296 Set_Ekind
(Id
, E_Generic_Procedure
);
2297 Set_Etype
(Id
, Standard_Void_Type
);
2300 -- For a library unit, we have reconstructed the entity for the unit,
2301 -- and must reset it in the library tables. We also make sure that
2302 -- Body_Required is set properly in the original compilation unit node.
2304 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2305 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2306 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2309 Set_Categorization_From_Pragmas
(N
);
2310 Validate_Categorization_Dependency
(N
, Id
);
2312 Save_Global_References
(Original_Node
(N
));
2316 Exit_Generic_Scope
(Id
);
2317 Generate_Reference_To_Formals
(Id
);
2318 end Analyze_Generic_Subprogram_Declaration
;
2320 -----------------------------------
2321 -- Analyze_Package_Instantiation --
2322 -----------------------------------
2324 -- Note: this procedure is also used for formal package declarations, in
2325 -- which case the argument N is an N_Formal_Package_Declaration node.
2326 -- This should really be noted in the spec! ???
2328 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2329 Loc
: constant Source_Ptr
:= Sloc
(N
);
2330 Gen_Id
: constant Node_Id
:= Name
(N
);
2333 Act_Decl_Name
: Node_Id
;
2334 Act_Decl_Id
: Entity_Id
;
2339 Gen_Unit
: Entity_Id
;
2341 Is_Actual_Pack
: constant Boolean :=
2342 Is_Internal
(Defining_Entity
(N
));
2344 Env_Installed
: Boolean := False;
2345 Parent_Installed
: Boolean := False;
2346 Renaming_List
: List_Id
;
2347 Unit_Renaming
: Node_Id
;
2348 Needs_Body
: Boolean;
2349 Inline_Now
: Boolean := False;
2351 procedure Delay_Descriptors
(E
: Entity_Id
);
2352 -- Delay generation of subprogram descriptors for given entity
2354 function Might_Inline_Subp
return Boolean;
2355 -- If inlining is active and the generic contains inlined subprograms,
2356 -- we instantiate the body. This may cause superfluous instantiations,
2357 -- but it is simpler than detecting the need for the body at the point
2358 -- of inlining, when the context of the instance is not available.
2360 -----------------------
2361 -- Delay_Descriptors --
2362 -----------------------
2364 procedure Delay_Descriptors
(E
: Entity_Id
) is
2366 if not Delay_Subprogram_Descriptors
(E
) then
2367 Set_Delay_Subprogram_Descriptors
(E
);
2368 Pending_Descriptor
.Increment_Last
;
2369 Pending_Descriptor
.Table
(Pending_Descriptor
.Last
) := E
;
2371 end Delay_Descriptors
;
2373 -----------------------
2374 -- Might_Inline_Subp --
2375 -----------------------
2377 function Might_Inline_Subp
return Boolean is
2381 if not Inline_Processing_Required
then
2385 E
:= First_Entity
(Gen_Unit
);
2386 while Present
(E
) loop
2387 if Is_Subprogram
(E
)
2388 and then Is_Inlined
(E
)
2398 end Might_Inline_Subp
;
2400 -- Start of processing for Analyze_Package_Instantiation
2403 -- Very first thing: apply the special kludge for Text_IO processing
2404 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2406 Text_IO_Kludge
(Name
(N
));
2408 -- Make node global for error reporting
2410 Instantiation_Node
:= N
;
2412 -- Case of instantiation of a generic package
2414 if Nkind
(N
) = N_Package_Instantiation
then
2415 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2416 Set_Comes_From_Source
(Act_Decl_Id
, True);
2418 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2420 Make_Defining_Program_Unit_Name
(Loc
,
2421 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2422 Defining_Identifier
=> Act_Decl_Id
);
2424 Act_Decl_Name
:= Act_Decl_Id
;
2427 -- Case of instantiation of a formal package
2430 Act_Decl_Id
:= Defining_Identifier
(N
);
2431 Act_Decl_Name
:= Act_Decl_Id
;
2434 Generate_Definition
(Act_Decl_Id
);
2435 Pre_Analyze_Actuals
(N
);
2438 Env_Installed
:= True;
2439 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2440 Gen_Unit
:= Entity
(Gen_Id
);
2442 -- Verify that it is the name of a generic package
2444 if Etype
(Gen_Unit
) = Any_Type
then
2448 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2450 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2452 if From_With_Type
(Gen_Unit
) then
2454 ("cannot instantiate a limited withed package", Gen_Id
);
2457 ("expect name of generic package in instantiation", Gen_Id
);
2464 if In_Extended_Main_Source_Unit
(N
) then
2465 Set_Is_Instantiated
(Gen_Unit
);
2466 Generate_Reference
(Gen_Unit
, N
);
2468 if Present
(Renamed_Object
(Gen_Unit
)) then
2469 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2470 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2474 if Nkind
(Gen_Id
) = N_Identifier
2475 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2478 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2480 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2481 and then Is_Child_Unit
(Gen_Unit
)
2482 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2483 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2486 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2489 Set_Entity
(Gen_Id
, Gen_Unit
);
2491 -- If generic is a renaming, get original generic unit
2493 if Present
(Renamed_Object
(Gen_Unit
))
2494 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2496 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2499 -- Verify that there are no circular instantiations
2501 if In_Open_Scopes
(Gen_Unit
) then
2502 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2506 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2507 Error_Msg_Node_2
:= Current_Scope
;
2509 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2510 Circularity_Detected
:= True;
2515 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
2516 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2518 -- Initialize renamings map, for error checking, and the list
2519 -- that holds private entities whose views have changed between
2520 -- generic definition and instantiation. If this is the instance
2521 -- created to validate an actual package, the instantiation
2522 -- environment is that of the enclosing instance.
2524 Generic_Renamings
.Set_Last
(0);
2525 Generic_Renamings_HTable
.Reset
;
2527 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2529 -- Copy original generic tree, to produce text for instantiation
2533 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
2535 Act_Spec
:= Specification
(Act_Tree
);
2537 -- If this is the instance created to validate an actual package,
2538 -- only the formals matter, do not examine the package spec itself.
2540 if Is_Actual_Pack
then
2541 Set_Visible_Declarations
(Act_Spec
, New_List
);
2542 Set_Private_Declarations
(Act_Spec
, New_List
);
2546 Analyze_Associations
2548 Generic_Formal_Declarations
(Act_Tree
),
2549 Generic_Formal_Declarations
(Gen_Decl
));
2551 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
2552 Set_Is_Generic_Instance
(Act_Decl_Id
);
2554 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
2556 -- References to the generic in its own declaration or its body
2557 -- are references to the instance. Add a renaming declaration for
2558 -- the generic unit itself. This declaration, as well as the renaming
2559 -- declarations for the generic formals, must remain private to the
2560 -- unit: the formals, because this is the language semantics, and
2561 -- the unit because its use is an artifact of the implementation.
2564 Make_Package_Renaming_Declaration
(Loc
,
2565 Defining_Unit_Name
=>
2566 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2567 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
2569 Append
(Unit_Renaming
, Renaming_List
);
2571 -- The renaming declarations are the first local declarations of
2574 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
2576 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
2578 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
2582 Make_Package_Declaration
(Loc
,
2583 Specification
=> Act_Spec
);
2585 -- Save the instantiation node, for subsequent instantiation
2586 -- of the body, if there is one and we are generating code for
2587 -- the current unit. Mark the unit as having a body, to avoid
2588 -- a premature error message.
2590 -- We instantiate the body if we are generating code, if we are
2591 -- generating cross-reference information, or if we are building
2592 -- trees for ASIS use.
2595 Enclosing_Body_Present
: Boolean := False;
2596 -- If the generic unit is not a compilation unit, then a body
2597 -- may be present in its parent even if none is required. We
2598 -- create a tentative pending instantiation for the body, which
2599 -- will be discarded if none is actually present.
2604 if Scope
(Gen_Unit
) /= Standard_Standard
2605 and then not Is_Child_Unit
(Gen_Unit
)
2607 Scop
:= Scope
(Gen_Unit
);
2609 while Present
(Scop
)
2610 and then Scop
/= Standard_Standard
2612 if Unit_Requires_Body
(Scop
) then
2613 Enclosing_Body_Present
:= True;
2616 elsif In_Open_Scopes
(Scop
)
2617 and then In_Package_Body
(Scop
)
2619 Enclosing_Body_Present
:= True;
2623 exit when Is_Compilation_Unit
(Scop
);
2624 Scop
:= Scope
(Scop
);
2628 -- If front-end inlining is enabled, and this is a unit for which
2629 -- code will be generated, we instantiate the body at once.
2630 -- This is done if the instance is not the main unit, and if the
2631 -- generic is not a child unit of another generic, to avoid scope
2632 -- problems and the reinstallation of parent instances.
2635 and then (not Is_Child_Unit
(Gen_Unit
)
2636 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
2637 and then Might_Inline_Subp
2638 and then not Is_Actual_Pack
2640 if Front_End_Inlining
2641 and then (Is_In_Main_Unit
(N
)
2642 or else In_Main_Context
(Current_Scope
))
2643 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2647 -- In configurable_run_time mode we force the inlining of
2648 -- predefined subprogram marked Inline_Always, to minimize
2649 -- the use of the run-time library.
2651 elsif Is_Predefined_File_Name
2652 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
2653 and then Configurable_Run_Time_Mode
2654 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2661 (Unit_Requires_Body
(Gen_Unit
)
2662 or else Enclosing_Body_Present
2663 or else Present
(Corresponding_Body
(Gen_Decl
)))
2664 and then (Is_In_Main_Unit
(N
)
2665 or else Might_Inline_Subp
)
2666 and then not Is_Actual_Pack
2667 and then not Inline_Now
2668 and then (Operating_Mode
= Generate_Code
2669 or else (Operating_Mode
= Check_Semantics
2670 and then ASIS_Mode
));
2672 -- If front_end_inlining is enabled, do not instantiate a
2673 -- body if within a generic context.
2675 if (Front_End_Inlining
2676 and then not Expander_Active
)
2677 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
2679 Needs_Body
:= False;
2682 -- If the current context is generic, and the package being
2683 -- instantiated is declared within a formal package, there is no
2684 -- body to instantiate until the enclosing generic is instantiated
2685 -- and there is an actual for the formal package. If the formal
2686 -- package has parameters, we build regular package instance for
2687 -- it, that preceeds the original formal package declaration.
2689 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
2691 Decl
: constant Node_Id
:=
2693 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
2695 if Nkind
(Decl
) = N_Formal_Package_Declaration
2696 or else (Nkind
(Decl
) = N_Package_Declaration
2697 and then Is_List_Member
(Decl
)
2698 and then Present
(Next
(Decl
))
2700 Nkind
(Next
(Decl
)) = N_Formal_Package_Declaration
)
2702 Needs_Body
:= False;
2708 -- If we are generating the calling stubs from the instantiation of
2709 -- a generic RCI package, we will not use the body of the generic
2712 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
2713 and then Is_Compilation_Unit
(Defining_Entity
(N
))
2715 Needs_Body
:= False;
2720 -- Here is a defence against a ludicrous number of instantiations
2721 -- caused by a circular set of instantiation attempts.
2723 if Pending_Instantiations
.Last
>
2724 Hostparm
.Max_Instantiations
2726 Error_Msg_N
("too many instantiations", N
);
2727 raise Unrecoverable_Error
;
2730 -- Indicate that the enclosing scopes contain an instantiation,
2731 -- and that cleanup actions should be delayed until after the
2732 -- instance body is expanded.
2734 Check_Forward_Instantiation
(Gen_Decl
);
2735 if Nkind
(N
) = N_Package_Instantiation
then
2737 Enclosing_Master
: Entity_Id
:= Current_Scope
;
2740 while Enclosing_Master
/= Standard_Standard
loop
2742 if Ekind
(Enclosing_Master
) = E_Package
then
2743 if Is_Compilation_Unit
(Enclosing_Master
) then
2744 if In_Package_Body
(Enclosing_Master
) then
2746 (Body_Entity
(Enclosing_Master
));
2755 Enclosing_Master
:= Scope
(Enclosing_Master
);
2758 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
2759 Enclosing_Master
:= Scope
(Enclosing_Master
);
2761 elsif Is_Generic_Subprogram
(Enclosing_Master
)
2762 or else Ekind
(Enclosing_Master
) = E_Void
2764 -- Cleanup actions will eventually be performed on
2765 -- the enclosing instance, if any. enclosing scope
2766 -- is void in the formal part of a generic subp.
2771 if Ekind
(Enclosing_Master
) = E_Entry
2773 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
2776 Protected_Body_Subprogram
(Enclosing_Master
);
2779 Set_Delay_Cleanups
(Enclosing_Master
);
2781 while Ekind
(Enclosing_Master
) = E_Block
loop
2782 Enclosing_Master
:= Scope
(Enclosing_Master
);
2785 if Is_Subprogram
(Enclosing_Master
) then
2786 Delay_Descriptors
(Enclosing_Master
);
2788 elsif Is_Task_Type
(Enclosing_Master
) then
2790 TBP
: constant Node_Id
:=
2791 Get_Task_Body_Procedure
2795 if Present
(TBP
) then
2796 Delay_Descriptors
(TBP
);
2797 Set_Delay_Cleanups
(TBP
);
2807 -- Make entry in table
2809 Pending_Instantiations
.Increment_Last
;
2810 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
2811 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
2815 Set_Categorization_From_Pragmas
(Act_Decl
);
2817 if Parent_Installed
then
2821 Set_Instance_Spec
(N
, Act_Decl
);
2823 -- If not a compilation unit, insert the package declaration
2824 -- before the original instantiation node.
2826 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2827 Mark_Rewrite_Insertion
(Act_Decl
);
2828 Insert_Before
(N
, Act_Decl
);
2831 -- For an instantiation that is a compilation unit, place
2832 -- declaration on current node so context is complete
2833 -- for analysis (including nested instantiations). It this
2834 -- is the main unit, the declaration eventually replaces the
2835 -- instantiation node. If the instance body is later created, it
2836 -- replaces the instance node, and the declation is attached to
2837 -- it (see Build_Instance_Compilation_Unit_Nodes).
2840 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
2842 -- The entity for the current unit is the newly created one,
2843 -- and all semantic information is attached to it.
2845 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
2847 -- If this is the main unit, replace the main entity as well
2849 if Current_Sem_Unit
= Main_Unit
then
2850 Main_Unit_Entity
:= Act_Decl_Id
;
2854 -- There is a problem with inlining here
2855 -- More comments needed??? what problem
2857 Set_Unit
(Parent
(N
), Act_Decl
);
2858 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
2860 Set_Unit
(Parent
(N
), N
);
2861 Set_Body_Required
(Parent
(N
), False);
2863 -- We never need elaboration checks on instantiations, since
2864 -- by definition, the body instantiation is elaborated at the
2865 -- same time as the spec instantiation.
2867 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
2868 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
2871 Check_Elab_Instantiation
(N
);
2873 if ABE_Is_Certain
(N
) and then Needs_Body
then
2874 Pending_Instantiations
.Decrement_Last
;
2876 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
2878 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
2879 First_Private_Entity
(Act_Decl_Id
));
2881 -- If the instantiation will receive a body, the unit will
2882 -- be transformed into a package body, and receive its own
2883 -- elaboration entity. Otherwise, the nature of the unit is
2884 -- now a package declaration.
2886 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2887 and then not Needs_Body
2889 Rewrite
(N
, Act_Decl
);
2892 if Present
(Corresponding_Body
(Gen_Decl
))
2893 or else Unit_Requires_Body
(Gen_Unit
)
2895 Set_Has_Completion
(Act_Decl_Id
);
2898 Check_Formal_Packages
(Act_Decl_Id
);
2900 Restore_Private_Views
(Act_Decl_Id
);
2902 if not Generic_Separately_Compiled
(Gen_Unit
) then
2903 Inherit_Context
(Gen_Decl
, N
);
2906 if Parent_Installed
then
2911 Env_Installed
:= False;
2914 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
2916 -- Check restriction, but skip this if something went wrong in
2917 -- the above analysis, indicated by Act_Decl_Id being void.
2919 if Ekind
(Act_Decl_Id
) /= E_Void
2920 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
2922 Check_Restriction
(No_Local_Allocators
, N
);
2926 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
2929 -- The following is a tree patch for ASIS: ASIS needs separate nodes
2930 -- to be used as defining identifiers for a formal package and for the
2931 -- corresponding expanded package
2933 if Nkind
(N
) = N_Formal_Package_Declaration
then
2934 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2935 Set_Comes_From_Source
(Act_Decl_Id
, True);
2936 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
2937 Set_Defining_Identifier
(N
, Act_Decl_Id
);
2941 when Instantiation_Error
=>
2942 if Parent_Installed
then
2946 if Env_Installed
then
2949 end Analyze_Package_Instantiation
;
2951 --------------------------
2952 -- Inline_Instance_Body --
2953 --------------------------
2955 procedure Inline_Instance_Body
2957 Gen_Unit
: Entity_Id
;
2961 Gen_Comp
: constant Entity_Id
:=
2962 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
2963 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
2964 Curr_Scope
: Entity_Id
:= Empty
;
2965 Curr_Unit
: constant Entity_Id
:=
2966 Cunit_Entity
(Current_Sem_Unit
);
2967 Removed
: Boolean := False;
2968 Num_Scopes
: Int
:= 0;
2969 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2970 Instances
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2971 Inner_Scopes
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2972 Num_Inner
: Int
:= 0;
2973 N_Instances
: Int
:= 0;
2977 -- Case of generic unit defined in another unit. We must remove
2978 -- the complete context of the current unit to install that of
2981 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
2985 and then S
/= Standard_Standard
2987 Num_Scopes
:= Num_Scopes
+ 1;
2989 Use_Clauses
(Num_Scopes
) :=
2991 (Scope_Stack
.Last
- Num_Scopes
+ 1).
2993 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
2995 exit when Is_Generic_Instance
(S
)
2996 and then (In_Package_Body
(S
)
2997 or else Ekind
(S
) = E_Procedure
2998 or else Ekind
(S
) = E_Function
);
3002 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
3004 -- Find and save all enclosing instances
3009 and then S
/= Standard_Standard
3011 if Is_Generic_Instance
(S
) then
3012 N_Instances
:= N_Instances
+ 1;
3013 Instances
(N_Instances
) := S
;
3015 exit when In_Package_Body
(S
);
3021 -- Remove context of current compilation unit, unless we
3022 -- are within a nested package instantiation, in which case
3023 -- the context has been removed previously.
3025 -- If current scope is the body of a child unit, remove context
3031 and then S
/= Standard_Standard
3033 exit when Is_Generic_Instance
(S
)
3034 and then (In_Package_Body
(S
)
3035 or else Ekind
(S
) = E_Procedure
3036 or else Ekind
(S
) = E_Function
);
3039 or else (Ekind
(Curr_Unit
) = E_Package_Body
3040 and then S
= Spec_Entity
(Curr_Unit
))
3041 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3044 (Unit_Declaration_Node
(Curr_Unit
)))
3048 -- Remove entities in current scopes from visibility, so
3049 -- than instance body is compiled in a clean environment.
3051 Save_Scope_Stack
(Handle_Use
=> False);
3053 if Is_Child_Unit
(S
) then
3055 -- Remove child unit from stack, as well as inner scopes.
3056 -- Removing the context of a child unit removes parent
3059 while Current_Scope
/= S
loop
3060 Num_Inner
:= Num_Inner
+ 1;
3061 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3066 Remove_Context
(Curr_Comp
);
3070 Remove_Context
(Curr_Comp
);
3073 if Ekind
(Curr_Unit
) = E_Package_Body
then
3074 Remove_Context
(Library_Unit
(Curr_Comp
));
3081 New_Scope
(Standard_Standard
);
3082 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3083 Instantiate_Package_Body
3084 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3089 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3091 -- Reset Generic_Instance flag so that use clauses can be installed
3092 -- in the proper order. (See Use_One_Package for effect of enclosing
3093 -- instances on processing of use clauses).
3095 for J
in 1 .. N_Instances
loop
3096 Set_Is_Generic_Instance
(Instances
(J
), False);
3100 Install_Context
(Curr_Comp
);
3102 if Present
(Curr_Scope
)
3103 and then Is_Child_Unit
(Curr_Scope
)
3105 New_Scope
(Curr_Scope
);
3106 Set_Is_Immediately_Visible
(Curr_Scope
);
3108 -- Finally, restore inner scopes as well
3110 for J
in reverse 1 .. Num_Inner
loop
3111 New_Scope
(Inner_Scopes
(J
));
3115 Restore_Scope_Stack
(Handle_Use
=> False);
3117 if Present
(Curr_Scope
)
3119 (In_Private_Part
(Curr_Scope
)
3120 or else In_Package_Body
(Curr_Scope
))
3122 -- Install private declaration of ancestor units, which
3123 -- are currently available. Restore_Scope_Stack and
3124 -- Install_Context only install the visible part of parents.
3129 Par
:= Scope
(Curr_Scope
);
3130 while (Present
(Par
))
3131 and then Par
/= Standard_Standard
3133 Install_Private_Declarations
(Par
);
3140 -- Restore use clauses. For a child unit, use clauses in the parents
3141 -- are restored when installing the context, so only those in inner
3142 -- scopes (and those local to the child unit itself) need to be
3143 -- installed explicitly.
3145 if Is_Child_Unit
(Curr_Unit
)
3148 for J
in reverse 1 .. Num_Inner
+ 1 loop
3149 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3151 Install_Use_Clauses
(Use_Clauses
(J
));
3155 for J
in reverse 1 .. Num_Scopes
loop
3156 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3158 Install_Use_Clauses
(Use_Clauses
(J
));
3162 for J
in 1 .. N_Instances
loop
3163 Set_Is_Generic_Instance
(Instances
(J
), True);
3166 -- If generic unit is in current unit, current context is correct
3169 Instantiate_Package_Body
3170 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3172 end Inline_Instance_Body
;
3174 -------------------------------------
3175 -- Analyze_Procedure_Instantiation --
3176 -------------------------------------
3178 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3180 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3181 end Analyze_Procedure_Instantiation
;
3183 --------------------------------------
3184 -- Analyze_Subprogram_Instantiation --
3185 --------------------------------------
3187 procedure Analyze_Subprogram_Instantiation
3191 Loc
: constant Source_Ptr
:= Sloc
(N
);
3192 Gen_Id
: constant Node_Id
:= Name
(N
);
3194 Anon_Id
: constant Entity_Id
:=
3195 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3196 Chars
=> New_External_Name
3197 (Chars
(Defining_Entity
(N
)), 'R'));
3199 Act_Decl_Id
: Entity_Id
;
3204 Env_Installed
: Boolean := False;
3205 Gen_Unit
: Entity_Id
;
3207 Pack_Id
: Entity_Id
;
3208 Parent_Installed
: Boolean := False;
3209 Renaming_List
: List_Id
;
3211 procedure Analyze_Instance_And_Renamings
;
3212 -- The instance must be analyzed in a context that includes the
3213 -- mappings of generic parameters into actuals. We create a package
3214 -- declaration for this purpose, and a subprogram with an internal
3215 -- name within the package. The subprogram instance is simply an
3216 -- alias for the internal subprogram, declared in the current scope.
3218 ------------------------------------
3219 -- Analyze_Instance_And_Renamings --
3220 ------------------------------------
3222 procedure Analyze_Instance_And_Renamings
is
3223 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3224 Pack_Decl
: Node_Id
;
3227 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3229 -- For the case of a compilation unit, the container package
3230 -- has the same name as the instantiation, to insure that the
3231 -- binder calls the elaboration procedure with the right name.
3232 -- Copy the entity of the instance, which may have compilation
3233 -- level flags (e.g. Is_Child_Unit) set.
3235 Pack_Id
:= New_Copy
(Def_Ent
);
3238 -- Otherwise we use the name of the instantiation concatenated
3239 -- with its source position to ensure uniqueness if there are
3240 -- several instantiations with the same name.
3243 Make_Defining_Identifier
(Loc
,
3244 Chars
=> New_External_Name
3245 (Related_Id
=> Chars
(Def_Ent
),
3247 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3250 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3251 Specification
=> Make_Package_Specification
(Loc
,
3252 Defining_Unit_Name
=> Pack_Id
,
3253 Visible_Declarations
=> Renaming_List
,
3254 End_Label
=> Empty
));
3256 Set_Instance_Spec
(N
, Pack_Decl
);
3257 Set_Is_Generic_Instance
(Pack_Id
);
3258 Set_Needs_Debug_Info
(Pack_Id
);
3260 -- Case of not a compilation unit
3262 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3263 Mark_Rewrite_Insertion
(Pack_Decl
);
3264 Insert_Before
(N
, Pack_Decl
);
3265 Set_Has_Completion
(Pack_Id
);
3267 -- Case of an instantiation that is a compilation unit
3269 -- Place declaration on current node so context is complete
3270 -- for analysis (including nested instantiations), and for
3271 -- use in a context_clause (see Analyze_With_Clause).
3274 Set_Unit
(Parent
(N
), Pack_Decl
);
3275 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3278 Analyze
(Pack_Decl
);
3279 Check_Formal_Packages
(Pack_Id
);
3280 Set_Is_Generic_Instance
(Pack_Id
, False);
3282 -- Body of the enclosing package is supplied when instantiating
3283 -- the subprogram body, after semantic analysis is completed.
3285 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3287 -- Remove package itself from visibility, so it does not
3288 -- conflict with subprogram.
3290 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3292 -- Set name and scope of internal subprogram so that the
3293 -- proper external name will be generated. The proper scope
3294 -- is the scope of the wrapper package. We need to generate
3295 -- debugging information for the internal subprogram, so set
3296 -- flag accordingly.
3298 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3299 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3301 -- Mark wrapper package as referenced, to avoid spurious
3302 -- warnings if the instantiation appears in various with_
3303 -- clauses of subunits of the main unit.
3305 Set_Referenced
(Pack_Id
);
3308 Set_Is_Generic_Instance
(Anon_Id
);
3309 Set_Needs_Debug_Info
(Anon_Id
);
3310 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3312 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3313 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3314 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3315 Set_Comes_From_Source
(Act_Decl_Id
, True);
3317 -- The signature may involve types that are not frozen yet, but
3318 -- the subprogram will be frozen at the point the wrapper package
3319 -- is frozen, so it does not need its own freeze node. In fact, if
3320 -- one is created, it might conflict with the freezing actions from
3321 -- the wrapper package (see 7206-013).
3323 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3325 -- If the instance is a child unit, mark the Id accordingly. Mark
3326 -- the anonymous entity as well, which is the real subprogram and
3327 -- which is used when the instance appears in a context clause.
3329 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3330 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3331 New_Overloaded_Entity
(Act_Decl_Id
);
3332 Check_Eliminated
(Act_Decl_Id
);
3334 -- In compilation unit case, kill elaboration checks on the
3335 -- instantiation, since they are never needed -- the body is
3336 -- instantiated at the same point as the spec.
3338 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3339 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3340 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3341 Set_Is_Compilation_Unit
(Anon_Id
);
3343 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3346 -- The instance is not a freezing point for the new subprogram
3348 Set_Is_Frozen
(Act_Decl_Id
, False);
3350 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3351 Valid_Operator_Definition
(Act_Decl_Id
);
3354 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3355 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3356 Set_Has_Completion
(Act_Decl_Id
);
3357 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3359 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3360 Set_Body_Required
(Parent
(N
), False);
3363 end Analyze_Instance_And_Renamings
;
3365 -- Start of processing for Analyze_Subprogram_Instantiation
3368 -- Very first thing: apply the special kludge for Text_IO processing
3369 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3370 -- Of course such an instantiation is bogus (these are packages, not
3371 -- subprograms), but we get a better error message if we do this.
3373 Text_IO_Kludge
(Gen_Id
);
3375 -- Make node global for error reporting
3377 Instantiation_Node
:= N
;
3378 Pre_Analyze_Actuals
(N
);
3381 Env_Installed
:= True;
3382 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3383 Gen_Unit
:= Entity
(Gen_Id
);
3385 Generate_Reference
(Gen_Unit
, Gen_Id
);
3387 if Nkind
(Gen_Id
) = N_Identifier
3388 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3391 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3394 if Etype
(Gen_Unit
) = Any_Type
then
3399 -- Verify that it is a generic subprogram of the right kind, and that
3400 -- it does not lead to a circular instantiation.
3402 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3403 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3405 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3407 elsif In_Open_Scopes
(Gen_Unit
) then
3408 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3410 elsif K
= E_Procedure
3411 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3413 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3415 ("cannot instantiate generic function as procedure", Gen_Id
);
3418 ("expect name of generic procedure in instantiation", Gen_Id
);
3421 elsif K
= E_Function
3422 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3424 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3426 ("cannot instantiate generic procedure as function", Gen_Id
);
3429 ("expect name of generic function in instantiation", Gen_Id
);
3433 Set_Entity
(Gen_Id
, Gen_Unit
);
3434 Set_Is_Instantiated
(Gen_Unit
);
3436 if In_Extended_Main_Source_Unit
(N
) then
3437 Generate_Reference
(Gen_Unit
, N
);
3440 -- If renaming, get original unit
3442 if Present
(Renamed_Object
(Gen_Unit
))
3443 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
3445 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
3447 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3448 Set_Is_Instantiated
(Gen_Unit
);
3449 Generate_Reference
(Gen_Unit
, N
);
3452 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3453 Error_Msg_Node_2
:= Current_Scope
;
3455 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3456 Circularity_Detected
:= True;
3460 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3462 -- The subprogram itself cannot contain a nested instance, so
3463 -- the current parent is left empty.
3465 Set_Instance_Env
(Gen_Unit
, Empty
);
3467 -- Initialize renamings map, for error checking
3469 Generic_Renamings
.Set_Last
(0);
3470 Generic_Renamings_HTable
.Reset
;
3472 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3474 -- Copy original generic tree, to produce text for instantiation
3478 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3480 Act_Spec
:= Specification
(Act_Tree
);
3482 Analyze_Associations
3484 Generic_Formal_Declarations
(Act_Tree
),
3485 Generic_Formal_Declarations
(Gen_Decl
));
3487 -- Build the subprogram declaration, which does not appear
3488 -- in the generic template, and give it a sloc consistent
3489 -- with that of the template.
3491 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
3492 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3494 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
3495 Specification
=> Act_Spec
);
3497 Set_Categorization_From_Pragmas
(Act_Decl
);
3499 if Parent_Installed
then
3503 Append
(Act_Decl
, Renaming_List
);
3504 Analyze_Instance_And_Renamings
;
3506 -- If the generic is marked Import (Intrinsic), then so is the
3507 -- instance. This indicates that there is no body to instantiate.
3508 -- If generic is marked inline, so it the instance, and the
3509 -- anonymous subprogram it renames. If inlined, or else if inlining
3510 -- is enabled for the compilation, we generate the instance body
3511 -- even if it is not within the main unit.
3513 -- Any other pragmas might also be inherited ???
3515 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
3516 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
3517 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
3519 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
3520 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
3524 Generate_Definition
(Act_Decl_Id
);
3526 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
3527 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
3529 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
3530 Check_Elab_Instantiation
(N
);
3533 if Is_Dispatching_Operation
(Act_Decl_Id
)
3534 and then Ada_Version
>= Ada_05
3540 Formal
:= First_Formal
(Act_Decl_Id
);
3541 while Present
(Formal
) loop
3542 if Ekind
(Etype
(Formal
)) = E_Anonymous_Access_Type
3543 and then Is_Controlling_Formal
(Formal
)
3544 and then not Can_Never_Be_Null
(Formal
)
3546 Error_Msg_NE
("access parameter& is controlling,",
3548 Error_Msg_NE
("\corresponding parameter of & must be"
3549 & " explicitly null-excluding", N
, Gen_Id
);
3552 Next_Formal
(Formal
);
3557 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3559 -- Subject to change, pending on if other pragmas are inherited ???
3561 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3563 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
3564 if not Generic_Separately_Compiled
(Gen_Unit
) then
3565 Inherit_Context
(Gen_Decl
, N
);
3568 Restore_Private_Views
(Pack_Id
, False);
3570 -- If the context requires a full instantiation, mark node for
3571 -- subsequent construction of the body.
3573 if (Is_In_Main_Unit
(N
)
3574 or else Is_Inlined
(Act_Decl_Id
))
3575 and then (Operating_Mode
= Generate_Code
3576 or else (Operating_Mode
= Check_Semantics
3577 and then ASIS_Mode
))
3578 and then (Expander_Active
or else ASIS_Mode
)
3579 and then not ABE_Is_Certain
(N
)
3580 and then not Is_Eliminated
(Act_Decl_Id
)
3582 Pending_Instantiations
.Increment_Last
;
3583 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
3584 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
3585 Check_Forward_Instantiation
(Gen_Decl
);
3587 -- The wrapper package is always delayed, because it does
3588 -- not constitute a freeze point, but to insure that the
3589 -- freeze node is placed properly, it is created directly
3590 -- when instantiating the body (otherwise the freeze node
3591 -- might appear to early for nested instantiations).
3593 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3595 -- For ASIS purposes, indicate that the wrapper package has
3596 -- replaced the instantiation node.
3598 Rewrite
(N
, Unit
(Parent
(N
)));
3599 Set_Unit
(Parent
(N
), N
);
3602 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3604 -- Replace instance node for library-level instantiations
3605 -- of intrinsic subprograms, for ASIS use.
3607 Rewrite
(N
, Unit
(Parent
(N
)));
3608 Set_Unit
(Parent
(N
), N
);
3611 if Parent_Installed
then
3616 Env_Installed
:= False;
3617 Generic_Renamings
.Set_Last
(0);
3618 Generic_Renamings_HTable
.Reset
;
3622 when Instantiation_Error
=>
3623 if Parent_Installed
then
3627 if Env_Installed
then
3630 end Analyze_Subprogram_Instantiation
;
3632 -------------------------
3633 -- Get_Associated_Node --
3634 -------------------------
3636 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
3637 Assoc
: Node_Id
:= Associated_Node
(N
);
3640 if Nkind
(Assoc
) /= Nkind
(N
) then
3643 elsif Nkind
(Assoc
) = N_Aggregate
3644 or else Nkind
(Assoc
) = N_Extension_Aggregate
3649 -- If the node is part of an inner generic, it may itself have been
3650 -- remapped into a further generic copy. Associated_Node is otherwise
3651 -- used for the entity of the node, and will be of a different node
3652 -- kind, or else N has been rewritten as a literal or function call.
3654 while Present
(Associated_Node
(Assoc
))
3655 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
3657 Assoc
:= Associated_Node
(Assoc
);
3660 -- Follow and additional link in case the final node was rewritten.
3661 -- This can only happen with nested generic units.
3663 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
3664 and then Present
(Associated_Node
(Assoc
))
3665 and then (Nkind
(Associated_Node
(Assoc
)) = N_Function_Call
3667 Nkind
(Associated_Node
(Assoc
)) = N_Explicit_Dereference
3669 Nkind
(Associated_Node
(Assoc
)) = N_Integer_Literal
3671 Nkind
(Associated_Node
(Assoc
)) = N_Real_Literal
3673 Nkind
(Associated_Node
(Assoc
)) = N_String_Literal
)
3675 Assoc
:= Associated_Node
(Assoc
);
3680 end Get_Associated_Node
;
3682 -------------------------------------------
3683 -- Build_Instance_Compilation_Unit_Nodes --
3684 -------------------------------------------
3686 procedure Build_Instance_Compilation_Unit_Nodes
3691 Decl_Cunit
: Node_Id
;
3692 Body_Cunit
: Node_Id
;
3694 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
3695 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
3698 -- A new compilation unit node is built for the instance declaration
3701 Make_Compilation_Unit
(Sloc
(N
),
3702 Context_Items
=> Empty_List
,
3705 Make_Compilation_Unit_Aux
(Sloc
(N
)));
3707 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3708 Set_Body_Required
(Decl_Cunit
, True);
3710 -- We use the original instantiation compilation unit as the resulting
3711 -- compilation unit of the instance, since this is the main unit.
3713 Rewrite
(N
, Act_Body
);
3714 Body_Cunit
:= Parent
(N
);
3716 -- The two compilation unit nodes are linked by the Library_Unit field
3718 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
3719 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
3721 -- Preserve the private nature of the package if needed
3723 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
3725 -- If the instance is not the main unit, its context, categorization,
3726 -- and elaboration entity are not relevant to the compilation.
3728 if Parent
(N
) /= Cunit
(Main_Unit
) then
3732 -- The context clause items on the instantiation, which are now
3733 -- attached to the body compilation unit (since the body overwrote
3734 -- the original instantiation node), semantically belong on the spec,
3735 -- so copy them there. It's harmless to leave them on the body as well.
3736 -- In fact one could argue that they belong in both places.
3738 Citem
:= First
(Context_Items
(Body_Cunit
));
3739 while Present
(Citem
) loop
3740 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
3744 -- Propagate categorization flags on packages, so that they appear
3745 -- in ali file for the spec of the unit.
3747 if Ekind
(New_Main
) = E_Package
then
3748 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
3749 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
3750 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
3751 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
3752 Set_Is_Remote_Call_Interface
3753 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
3756 -- Make entry in Units table, so that binder can generate call to
3757 -- elaboration procedure for body, if any.
3759 Make_Instance_Unit
(Body_Cunit
);
3760 Main_Unit_Entity
:= New_Main
;
3761 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
3763 -- Build elaboration entity, since the instance may certainly
3764 -- generate elaboration code requiring a flag for protection.
3766 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
3767 end Build_Instance_Compilation_Unit_Nodes
;
3769 -----------------------------------
3770 -- Check_Formal_Package_Instance --
3771 -----------------------------------
3773 -- If the formal has specific parameters, they must match those of the
3774 -- actual. Both of them are instances, and the renaming declarations
3775 -- for their formal parameters appear in the same order in both. The
3776 -- analyzed formal has been analyzed in the context of the current
3779 procedure Check_Formal_Package_Instance
3780 (Formal_Pack
: Entity_Id
;
3781 Actual_Pack
: Entity_Id
)
3783 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
3784 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
3789 procedure Check_Mismatch
(B
: Boolean);
3790 -- Common error routine for mismatch between the parameters of
3791 -- the actual instance and those of the formal package.
3793 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
3794 -- The formal may come from a nested formal package, and the actual
3795 -- may have been constant-folded. To determine whether the two denote
3796 -- the same entity we may have to traverse several definitions to
3797 -- recover the ultimate entity that they refer to.
3799 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
3800 -- Similarly, if the formal comes from a nested formal package, the
3801 -- actual may designate the formal through multiple renamings, which
3802 -- have to be followed to determine the original variable in question.
3804 --------------------
3805 -- Check_Mismatch --
3806 --------------------
3808 procedure Check_Mismatch
(B
: Boolean) is
3812 ("actual for & in actual instance does not match formal",
3813 Parent
(Actual_Pack
), E1
);
3817 --------------------------------
3818 -- Same_Instantiated_Constant --
3819 --------------------------------
3821 function Same_Instantiated_Constant
3822 (E1
, E2
: Entity_Id
) return Boolean
3828 while Present
(Ent
) loop
3832 elsif Ekind
(Ent
) /= E_Constant
then
3835 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
3836 if Entity
(Constant_Value
(Ent
)) = E1
then
3839 Ent
:= Entity
(Constant_Value
(Ent
));
3842 -- The actual may be a constant that has been folded. Recover
3845 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
3846 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
3853 end Same_Instantiated_Constant
;
3855 --------------------------------
3856 -- Same_Instantiated_Variable --
3857 --------------------------------
3859 function Same_Instantiated_Variable
3860 (E1
, E2
: Entity_Id
) return Boolean
3862 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
3863 -- Follow chain of renamings to the ultimate ancestor
3865 ---------------------
3866 -- Original_Entity --
3867 ---------------------
3869 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
3874 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
3875 and then Present
(Renamed_Object
(Orig
))
3876 and then Is_Entity_Name
(Renamed_Object
(Orig
))
3878 Orig
:= Entity
(Renamed_Object
(Orig
));
3882 end Original_Entity
;
3884 -- Start of processing for Same_Instantiated_Variable
3887 return Ekind
(E1
) = Ekind
(E2
)
3888 and then Original_Entity
(E1
) = Original_Entity
(E2
);
3889 end Same_Instantiated_Variable
;
3891 -- Start of processing for Check_Formal_Package_Instance
3895 and then Present
(E2
)
3897 exit when Ekind
(E1
) = E_Package
3898 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
3900 if Is_Type
(E1
) then
3902 -- Subtypes must statically match. E1 and E2 are the
3903 -- local entities that are subtypes of the actuals.
3904 -- Itypes generated for other parameters need not be checked,
3905 -- the check will be performed on the parameters themselves.
3907 if not Is_Itype
(E1
)
3908 and then not Is_Itype
(E2
)
3912 or else Etype
(E1
) /= Etype
(E2
)
3913 or else not Subtypes_Statically_Match
(E1
, E2
));
3916 elsif Ekind
(E1
) = E_Constant
then
3918 -- IN parameters must denote the same static value, or
3919 -- the same constant, or the literal null.
3921 Expr1
:= Expression
(Parent
(E1
));
3923 if Ekind
(E2
) /= E_Constant
then
3924 Check_Mismatch
(True);
3927 Expr2
:= Expression
(Parent
(E2
));
3930 if Is_Static_Expression
(Expr1
) then
3932 if not Is_Static_Expression
(Expr2
) then
3933 Check_Mismatch
(True);
3935 elsif Is_Integer_Type
(Etype
(E1
)) then
3938 V1
: constant Uint
:= Expr_Value
(Expr1
);
3939 V2
: constant Uint
:= Expr_Value
(Expr2
);
3941 Check_Mismatch
(V1
/= V2
);
3944 elsif Is_Real_Type
(Etype
(E1
)) then
3946 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
3947 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
3949 Check_Mismatch
(V1
/= V2
);
3952 elsif Is_String_Type
(Etype
(E1
))
3953 and then Nkind
(Expr1
) = N_String_Literal
3956 if Nkind
(Expr2
) /= N_String_Literal
then
3957 Check_Mismatch
(True);
3960 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
3964 elsif Is_Entity_Name
(Expr1
) then
3965 if Is_Entity_Name
(Expr2
) then
3966 if Entity
(Expr1
) = Entity
(Expr2
) then
3970 (not Same_Instantiated_Constant
3971 (Entity
(Expr1
), Entity
(Expr2
)));
3974 Check_Mismatch
(True);
3977 elsif Is_Entity_Name
(Original_Node
(Expr1
))
3978 and then Is_Entity_Name
(Expr2
)
3980 Same_Instantiated_Constant
3981 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
3985 elsif Nkind
(Expr1
) = N_Null
then
3986 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
3989 Check_Mismatch
(True);
3992 elsif Ekind
(E1
) = E_Variable
then
3993 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
3995 elsif Ekind
(E1
) = E_Package
then
3997 (Ekind
(E1
) /= Ekind
(E2
)
3998 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
4000 elsif Is_Overloadable
(E1
) then
4002 -- Verify that the names of the entities match.
4003 -- What if actual is an attribute ???
4006 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
4009 raise Program_Error
;
4016 end Check_Formal_Package_Instance
;
4018 ---------------------------
4019 -- Check_Formal_Packages --
4020 ---------------------------
4022 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
4024 Formal_P
: Entity_Id
;
4027 -- Iterate through the declarations in the instance, looking for
4028 -- package renaming declarations that denote instances of formal
4029 -- packages. Stop when we find the renaming of the current package
4030 -- itself. The declaration for a formal package without a box is
4031 -- followed by an internal entity that repeats the instantiation.
4033 E
:= First_Entity
(P_Id
);
4034 while Present
(E
) loop
4035 if Ekind
(E
) = E_Package
then
4036 if Renamed_Object
(E
) = P_Id
then
4039 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4042 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4043 Formal_P
:= Next_Entity
(E
);
4044 Check_Formal_Package_Instance
(Formal_P
, E
);
4050 end Check_Formal_Packages
;
4052 ---------------------------------
4053 -- Check_Forward_Instantiation --
4054 ---------------------------------
4056 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
4058 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
4061 -- The instantiation appears before the generic body if we are in the
4062 -- scope of the unit containing the generic, either in its spec or in
4063 -- the package body. and before the generic body.
4065 if Ekind
(Gen_Comp
) = E_Package_Body
then
4066 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
4069 if In_Open_Scopes
(Gen_Comp
)
4070 and then No
(Corresponding_Body
(Decl
))
4075 and then not Is_Compilation_Unit
(S
)
4076 and then not Is_Child_Unit
(S
)
4078 if Ekind
(S
) = E_Package
then
4079 Set_Has_Forward_Instantiation
(S
);
4085 end Check_Forward_Instantiation
;
4087 ---------------------------
4088 -- Check_Generic_Actuals --
4089 ---------------------------
4091 -- The visibility of the actuals may be different between the
4092 -- point of generic instantiation and the instantiation of the body.
4094 procedure Check_Generic_Actuals
4095 (Instance
: Entity_Id
;
4096 Is_Formal_Box
: Boolean)
4101 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4102 -- For a formal that is an array type, the component type is often
4103 -- a previous formal in the same unit. The privacy status of the
4104 -- component type will have been examined earlier in the traversal
4105 -- of the corresponding actuals, and this status should not be
4106 -- modified for the array type itself.
4107 -- To detect this case we have to rescan the list of formals, which
4108 -- is usually short enough to ignore the resulting inefficiency.
4110 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4113 Prev
:= First_Entity
(Instance
);
4114 while Present
(Prev
) loop
4116 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4117 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4118 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4128 end Denotes_Previous_Actual
;
4130 -- Start of processing for Check_Generic_Actuals
4133 E
:= First_Entity
(Instance
);
4134 while Present
(E
) loop
4136 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4137 and then Scope
(Etype
(E
)) /= Instance
4138 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4140 if Is_Array_Type
(E
)
4141 and then Denotes_Previous_Actual
(Component_Type
(E
))
4145 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4147 Set_Is_Generic_Actual_Type
(E
, True);
4148 Set_Is_Hidden
(E
, False);
4149 Set_Is_Potentially_Use_Visible
(E
,
4152 -- We constructed the generic actual type as a subtype of
4153 -- the supplied type. This means that it normally would not
4154 -- inherit subtype specific attributes of the actual, which
4155 -- is wrong for the generic case.
4157 Astype
:= Ancestor_Subtype
(E
);
4161 -- can happen when E is an itype that is the full view of
4162 -- a private type completed, e.g. with a constrained array.
4164 Astype
:= Base_Type
(E
);
4167 Set_Size_Info
(E
, (Astype
));
4168 Set_RM_Size
(E
, RM_Size
(Astype
));
4169 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4171 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4172 Set_RM_Size
(E
, RM_Size
(Astype
));
4174 -- In nested instances, the base type of an access actual
4175 -- may itself be private, and need to be exchanged.
4177 elsif Is_Access_Type
(E
)
4178 and then Is_Private_Type
(Etype
(E
))
4181 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4184 elsif Ekind
(E
) = E_Package
then
4186 -- If this is the renaming for the current instance, we're done.
4187 -- Otherwise it is a formal package. If the corresponding formal
4188 -- was declared with a box, the (instantiations of the) generic
4189 -- formal part are also visible. Otherwise, ignore the entity
4190 -- created to validate the actuals.
4192 if Renamed_Object
(E
) = Instance
then
4195 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4198 -- The visibility of a formal of an enclosing generic is already
4201 elsif Denotes_Formal_Package
(E
) then
4204 elsif Present
(Associated_Formal_Package
(E
)) then
4205 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4206 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4209 Set_Is_Hidden
(E
, False);
4212 -- If this is a subprogram instance (in a wrapper package) the
4213 -- actual is fully visible.
4215 elsif Is_Wrapper_Package
(Instance
) then
4216 Set_Is_Hidden
(E
, False);
4219 Set_Is_Hidden
(E
, not Is_Formal_Box
);
4224 end Check_Generic_Actuals
;
4226 ------------------------------
4227 -- Check_Generic_Child_Unit --
4228 ------------------------------
4230 procedure Check_Generic_Child_Unit
4232 Parent_Installed
: in out Boolean)
4234 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4235 Gen_Par
: Entity_Id
:= Empty
;
4236 Inst_Par
: Entity_Id
;
4240 function Find_Generic_Child
4242 Id
: Node_Id
) return Entity_Id
;
4243 -- Search generic parent for possible child unit with the given name
4245 function In_Enclosing_Instance
return Boolean;
4246 -- Within an instance of the parent, the child unit may be denoted
4247 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4248 -- scopes to locate a possible parent instantiation.
4250 ------------------------
4251 -- Find_Generic_Child --
4252 ------------------------
4254 function Find_Generic_Child
4256 Id
: Node_Id
) return Entity_Id
4261 -- If entity of name is already set, instance has already been
4262 -- resolved, e.g. in an enclosing instantiation.
4264 if Present
(Entity
(Id
)) then
4265 if Scope
(Entity
(Id
)) = Scop
then
4272 E
:= First_Entity
(Scop
);
4273 while Present
(E
) loop
4274 if Chars
(E
) = Chars
(Id
)
4275 and then Is_Child_Unit
(E
)
4277 if Is_Child_Unit
(E
)
4278 and then not Is_Visible_Child_Unit
(E
)
4281 ("generic child unit& is not visible", Gen_Id
, E
);
4293 end Find_Generic_Child
;
4295 ---------------------------
4296 -- In_Enclosing_Instance --
4297 ---------------------------
4299 function In_Enclosing_Instance
return Boolean is
4300 Enclosing_Instance
: Node_Id
;
4301 Instance_Decl
: Node_Id
;
4304 Enclosing_Instance
:= Current_Scope
;
4306 while Present
(Enclosing_Instance
) loop
4307 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4309 if Ekind
(Enclosing_Instance
) = E_Package
4310 and then Is_Generic_Instance
(Enclosing_Instance
)
4312 (Generic_Parent
(Specification
(Instance_Decl
)))
4314 -- Check whether the generic we are looking for is a child
4315 -- of this instance.
4317 E
:= Find_Generic_Child
4318 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4319 exit when Present
(E
);
4325 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
4337 Make_Expanded_Name
(Loc
,
4339 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
4340 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
4342 Set_Entity
(Gen_Id
, E
);
4343 Set_Etype
(Gen_Id
, Etype
(E
));
4344 Parent_Installed
:= False; -- Already in scope.
4347 end In_Enclosing_Instance
;
4349 -- Start of processing for Check_Generic_Child_Unit
4352 -- If the name of the generic is given by a selected component, it
4353 -- may be the name of a generic child unit, and the prefix is the name
4354 -- of an instance of the parent, in which case the child unit must be
4355 -- visible. If this instance is not in scope, it must be placed there
4356 -- and removed after instantiation, because what is being instantiated
4357 -- is not the original child, but the corresponding child present in
4358 -- the instance of the parent.
4360 -- If the child is instantiated within the parent, it can be given by
4361 -- a simple name. In this case the instance is already in scope, but
4362 -- the child generic must be recovered from the generic parent as well.
4364 if Nkind
(Gen_Id
) = N_Selected_Component
then
4365 S
:= Selector_Name
(Gen_Id
);
4366 Analyze
(Prefix
(Gen_Id
));
4367 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4369 if Ekind
(Inst_Par
) = E_Package
4370 and then Present
(Renamed_Object
(Inst_Par
))
4372 Inst_Par
:= Renamed_Object
(Inst_Par
);
4375 if Ekind
(Inst_Par
) = E_Package
then
4376 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
4377 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
4379 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
4381 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
4383 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
4386 elsif Ekind
(Inst_Par
) = E_Generic_Package
4387 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
4389 -- A formal package may be a real child package, and not the
4390 -- implicit instance within a parent. In this case the child is
4391 -- not visible and has to be retrieved explicitly as well.
4393 Gen_Par
:= Inst_Par
;
4396 if Present
(Gen_Par
) then
4398 -- The prefix denotes an instantiation. The entity itself
4399 -- may be a nested generic, or a child unit.
4401 E
:= Find_Generic_Child
(Gen_Par
, S
);
4404 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
4405 Set_Entity
(Gen_Id
, E
);
4406 Set_Etype
(Gen_Id
, Etype
(E
));
4408 Set_Etype
(S
, Etype
(E
));
4410 -- Indicate that this is a reference to the parent
4412 if In_Extended_Main_Source_Unit
(Gen_Id
) then
4413 Set_Is_Instantiated
(Inst_Par
);
4416 -- A common mistake is to replicate the naming scheme of
4417 -- a hierarchy by instantiating a generic child directly,
4418 -- rather than the implicit child in a parent instance:
4420 -- generic .. package Gpar is ..
4421 -- generic .. package Gpar.Child is ..
4422 -- package Par is new Gpar ();
4425 -- package Par.Child is new Gpar.Child ();
4426 -- rather than Par.Child
4428 -- In this case the instantiation is within Par, which is
4429 -- an instance, but Gpar does not denote Par because we are
4430 -- not IN the instance of Gpar, so this is illegal. The test
4431 -- below recognizes this particular case.
4433 if Is_Child_Unit
(E
)
4434 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
4435 and then (not In_Instance
4436 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
4440 ("prefix of generic child unit must be instance of parent",
4444 if not In_Open_Scopes
(Inst_Par
)
4445 and then Nkind
(Parent
(Gen_Id
)) not in
4446 N_Generic_Renaming_Declaration
4448 Install_Parent
(Inst_Par
);
4449 Parent_Installed
:= True;
4453 -- If the generic parent does not contain an entity that
4454 -- corresponds to the selector, the instance doesn't either.
4455 -- Analyzing the node will yield the appropriate error message.
4456 -- If the entity is not a child unit, then it is an inner
4457 -- generic in the parent.
4465 if Is_Child_Unit
(Entity
(Gen_Id
))
4467 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4468 and then not In_Open_Scopes
(Inst_Par
)
4470 Install_Parent
(Inst_Par
);
4471 Parent_Installed
:= True;
4475 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
4477 -- Entity already present, analyze prefix, whose meaning may be
4478 -- an instance in the current context. If it is an instance of
4479 -- a relative within another, the proper parent may still have
4480 -- to be installed, if they are not of the same generation.
4482 Analyze
(Prefix
(Gen_Id
));
4483 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4485 if In_Enclosing_Instance
then
4488 elsif Present
(Entity
(Gen_Id
))
4489 and then Is_Child_Unit
(Entity
(Gen_Id
))
4490 and then not In_Open_Scopes
(Inst_Par
)
4492 Install_Parent
(Inst_Par
);
4493 Parent_Installed
:= True;
4496 elsif In_Enclosing_Instance
then
4498 -- The child unit is found in some enclosing scope
4505 -- If this is the renaming of the implicit child in a parent
4506 -- instance, recover the parent name and install it.
4508 if Is_Entity_Name
(Gen_Id
) then
4509 E
:= Entity
(Gen_Id
);
4511 if Is_Generic_Unit
(E
)
4512 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
4513 and then Is_Child_Unit
(Renamed_Object
(E
))
4514 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
4515 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
4518 New_Copy_Tree
(Name
(Parent
(E
))));
4519 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4521 if not In_Open_Scopes
(Inst_Par
) then
4522 Install_Parent
(Inst_Par
);
4523 Parent_Installed
:= True;
4526 -- If it is a child unit of a non-generic parent, it may be
4527 -- use-visible and given by a direct name. Install parent as
4530 elsif Is_Generic_Unit
(E
)
4531 and then Is_Child_Unit
(E
)
4533 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4534 and then not Is_Generic_Unit
(Scope
(E
))
4536 if not In_Open_Scopes
(Scope
(E
)) then
4537 Install_Parent
(Scope
(E
));
4538 Parent_Installed
:= True;
4543 end Check_Generic_Child_Unit
;
4545 -----------------------------
4546 -- Check_Hidden_Child_Unit --
4547 -----------------------------
4549 procedure Check_Hidden_Child_Unit
4551 Gen_Unit
: Entity_Id
;
4552 Act_Decl_Id
: Entity_Id
)
4554 Gen_Id
: constant Node_Id
:= Name
(N
);
4557 if Is_Child_Unit
(Gen_Unit
)
4558 and then Is_Child_Unit
(Act_Decl_Id
)
4559 and then Nkind
(Gen_Id
) = N_Expanded_Name
4560 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
4561 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
4563 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
4565 ("generic unit & is implicitly declared in &",
4566 Defining_Unit_Name
(N
), Gen_Unit
);
4567 Error_Msg_N
("\instance must have different name",
4568 Defining_Unit_Name
(N
));
4570 end Check_Hidden_Child_Unit
;
4572 ------------------------
4573 -- Check_Private_View --
4574 ------------------------
4576 procedure Check_Private_View
(N
: Node_Id
) is
4577 T
: constant Entity_Id
:= Etype
(N
);
4581 -- Exchange views if the type was not private in the generic but is
4582 -- private at the point of instantiation. Do not exchange views if
4583 -- the scope of the type is in scope. This can happen if both generic
4584 -- and instance are sibling units, or if type is defined in a parent.
4585 -- In this case the visibility of the type will be correct for all
4589 BT
:= Base_Type
(T
);
4591 if Is_Private_Type
(T
)
4592 and then not Has_Private_View
(N
)
4593 and then Present
(Full_View
(T
))
4594 and then not In_Open_Scopes
(Scope
(T
))
4596 -- In the generic, the full type was visible. Save the
4597 -- private entity, for subsequent exchange.
4601 elsif Has_Private_View
(N
)
4602 and then not Is_Private_Type
(T
)
4603 and then not Has_Been_Exchanged
(T
)
4604 and then Etype
(Get_Associated_Node
(N
)) /= T
4606 -- Only the private declaration was visible in the generic. If
4607 -- the type appears in a subtype declaration, the subtype in the
4608 -- instance must have a view compatible with that of its parent,
4609 -- which must be exchanged (see corresponding code in Restore_
4610 -- Private_Views). Otherwise, if the type is defined in a parent
4611 -- unit, leave full visibility within instance, which is safe.
4613 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
4614 and then not Is_Private_Type
(Base_Type
(T
))
4615 and then Comes_From_Source
(Base_Type
(T
))
4619 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
4620 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
4622 Prepend_Elmt
(T
, Exchanged_Views
);
4623 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
4626 -- For composite types with inconsistent representation
4627 -- exchange component types accordingly.
4629 elsif Is_Access_Type
(T
)
4630 and then Is_Private_Type
(Designated_Type
(T
))
4631 and then not Has_Private_View
(N
)
4632 and then Present
(Full_View
(Designated_Type
(T
)))
4634 Switch_View
(Designated_Type
(T
));
4636 elsif Is_Array_Type
(T
)
4637 and then Is_Private_Type
(Component_Type
(T
))
4638 and then not Has_Private_View
(N
)
4639 and then Present
(Full_View
(Component_Type
(T
)))
4641 Switch_View
(Component_Type
(T
));
4643 elsif Is_Private_Type
(T
)
4644 and then Present
(Full_View
(T
))
4645 and then Is_Array_Type
(Full_View
(T
))
4646 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
4650 -- Finally, a non-private subtype may have a private base type,
4651 -- which must be exchanged for consistency. This can happen when
4652 -- instantiating a package body, when the scope stack is empty
4653 -- but in fact the subtype and the base type are declared in an
4656 elsif not Is_Private_Type
(T
)
4657 and then not Has_Private_View
(N
)
4658 and then Is_Private_Type
(Base_Type
(T
))
4659 and then Present
(Full_View
(BT
))
4660 and then not Is_Generic_Type
(BT
)
4661 and then not In_Open_Scopes
(BT
)
4663 Prepend_Elmt
(Full_View
(BT
), Exchanged_Views
);
4664 Exchange_Declarations
(BT
);
4667 end Check_Private_View
;
4669 --------------------------
4670 -- Contains_Instance_Of --
4671 --------------------------
4673 function Contains_Instance_Of
4676 N
: Node_Id
) return Boolean
4684 -- Verify that there are no circular instantiations. We check whether
4685 -- the unit contains an instance of the current scope or some enclosing
4686 -- scope (in case one of the instances appears in a subunit). Longer
4687 -- circularities involving subunits might seem too pathological to
4688 -- consider, but they were not too pathological for the authors of
4689 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4690 -- enclosing generic scopes as containing an instance.
4693 -- Within a generic subprogram body, the scope is not generic, to
4694 -- allow for recursive subprograms. Use the declaration to determine
4695 -- whether this is a generic unit.
4697 if Ekind
(Scop
) = E_Generic_Package
4698 or else (Is_Subprogram
(Scop
)
4699 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
4700 N_Generic_Subprogram_Declaration
)
4702 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
4704 while Present
(Elmt
) loop
4705 if Node
(Elmt
) = Scop
then
4706 Error_Msg_Node_2
:= Inner
;
4708 ("circular Instantiation: & instantiated within &!",
4712 elsif Node
(Elmt
) = Inner
then
4715 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
4716 Error_Msg_Node_2
:= Inner
;
4718 ("circular Instantiation: & instantiated within &!",
4726 -- Indicate that Inner is being instantiated within Scop
4728 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
4731 if Scop
= Standard_Standard
then
4734 Scop
:= Scope
(Scop
);
4739 end Contains_Instance_Of
;
4741 -----------------------
4742 -- Copy_Generic_Node --
4743 -----------------------
4745 function Copy_Generic_Node
4747 Parent_Id
: Node_Id
;
4748 Instantiating
: Boolean) return Node_Id
4753 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
4754 -- Check the given value of one of the Fields referenced by the
4755 -- current node to determine whether to copy it recursively. The
4756 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4757 -- value (Sloc, Uint, Char) in which case it need not be copied.
4759 procedure Copy_Descendants
;
4760 -- Common utility for various nodes
4762 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
4763 -- Make copy of element list
4765 function Copy_Generic_List
4767 Parent_Id
: Node_Id
) return List_Id
;
4768 -- Apply Copy_Node recursively to the members of a node list
4770 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
4771 -- True if an identifier is part of the defining program unit name
4772 -- of a child unit. The entity of such an identifier must be kept
4773 -- (for ASIS use) even though as the name of an enclosing generic
4774 -- it would otherwise not be preserved in the generic tree.
4776 ----------------------
4777 -- Copy_Descendants --
4778 ----------------------
4780 procedure Copy_Descendants
is
4782 use Atree
.Unchecked_Access
;
4783 -- This code section is part of the implementation of an untyped
4784 -- tree traversal, so it needs direct access to node fields.
4787 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
4788 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
4789 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
4790 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
4791 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
4792 end Copy_Descendants
;
4794 -----------------------------
4795 -- Copy_Generic_Descendant --
4796 -----------------------------
4798 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
4800 if D
= Union_Id
(Empty
) then
4803 elsif D
in Node_Range
then
4805 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
4807 elsif D
in List_Range
then
4808 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
4810 elsif D
in Elist_Range
then
4811 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
4813 -- Nothing else is copyable (e.g. Uint values), return as is
4818 end Copy_Generic_Descendant
;
4820 ------------------------
4821 -- Copy_Generic_Elist --
4822 ------------------------
4824 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
4831 M
:= First_Elmt
(E
);
4832 while Present
(M
) loop
4834 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
4843 end Copy_Generic_Elist
;
4845 -----------------------
4846 -- Copy_Generic_List --
4847 -----------------------
4849 function Copy_Generic_List
4851 Parent_Id
: Node_Id
) return List_Id
4859 Set_Parent
(New_L
, Parent_Id
);
4862 while Present
(N
) loop
4863 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
4872 end Copy_Generic_List
;
4874 ---------------------------
4875 -- In_Defining_Unit_Name --
4876 ---------------------------
4878 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
4880 return Present
(Parent
(Nam
))
4881 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
4883 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
4884 and then In_Defining_Unit_Name
(Parent
(Nam
))));
4885 end In_Defining_Unit_Name
;
4887 -- Start of processing for Copy_Generic_Node
4894 New_N
:= New_Copy
(N
);
4896 if Instantiating
then
4897 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
4900 if not Is_List_Member
(N
) then
4901 Set_Parent
(New_N
, Parent_Id
);
4904 -- If defining identifier, then all fields have been copied already
4906 if Nkind
(New_N
) in N_Entity
then
4909 -- Special casing for identifiers and other entity names and operators
4911 elsif Nkind
(New_N
) = N_Identifier
4912 or else Nkind
(New_N
) = N_Character_Literal
4913 or else Nkind
(New_N
) = N_Expanded_Name
4914 or else Nkind
(New_N
) = N_Operator_Symbol
4915 or else Nkind
(New_N
) in N_Op
4917 if not Instantiating
then
4919 -- Link both nodes in order to assign subsequently the
4920 -- entity of the copy to the original node, in case this
4921 -- is a global reference.
4923 Set_Associated_Node
(N
, New_N
);
4925 -- If we are within an instantiation, this is a nested generic
4926 -- that has already been analyzed at the point of definition. We
4927 -- must preserve references that were global to the enclosing
4928 -- parent at that point. Other occurrences, whether global or
4929 -- local to the current generic, must be resolved anew, so we
4930 -- reset the entity in the generic copy. A global reference has
4931 -- a smaller depth than the parent, or else the same depth in
4932 -- case both are distinct compilation units.
4934 -- It is also possible for Current_Instantiated_Parent to be
4935 -- defined, and for this not to be a nested generic, namely
4936 -- if the unit is loaded through Rtsfind. In that case, the
4937 -- entity of New_N is only a link to the associated node, and
4938 -- not a defining occurrence.
4940 -- The entities for parent units in the defining_program_unit
4941 -- of a generic child unit are established when the context of
4942 -- the unit is first analyzed, before the generic copy is made.
4943 -- They are preserved in the copy for use in ASIS queries.
4945 Ent
:= Entity
(New_N
);
4947 if No
(Current_Instantiated_Parent
.Gen_Id
) then
4949 or else Nkind
(Ent
) /= N_Defining_Identifier
4950 or else not In_Defining_Unit_Name
(N
)
4952 Set_Associated_Node
(New_N
, Empty
);
4957 not (Nkind
(Ent
) = N_Defining_Identifier
4959 Nkind
(Ent
) = N_Defining_Character_Literal
4961 Nkind
(Ent
) = N_Defining_Operator_Symbol
)
4962 or else No
(Scope
(Ent
))
4963 or else Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
4964 or else (Scope_Depth
(Scope
(Ent
)) >
4965 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
4967 Get_Source_Unit
(Ent
) =
4968 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
4970 Set_Associated_Node
(New_N
, Empty
);
4973 -- Case of instantiating identifier or some other name or operator
4976 -- If the associated node is still defined, the entity in
4977 -- it is global, and must be copied to the instance.
4978 -- If this copy is being made for a body to inline, it is
4979 -- applied to an instantiated tree, and the entity is already
4980 -- present and must be also preserved.
4983 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
4985 if Present
(Assoc
) then
4986 if Nkind
(Assoc
) = Nkind
(N
) then
4987 Set_Entity
(New_N
, Entity
(Assoc
));
4988 Check_Private_View
(N
);
4990 elsif Nkind
(Assoc
) = N_Function_Call
then
4991 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
4993 elsif (Nkind
(Assoc
) = N_Defining_Identifier
4994 or else Nkind
(Assoc
) = N_Defining_Character_Literal
4995 or else Nkind
(Assoc
) = N_Defining_Operator_Symbol
)
4996 and then Expander_Active
4998 -- Inlining case: we are copying a tree that contains
4999 -- global entities, which are preserved in the copy
5000 -- to be used for subsequent inlining.
5005 Set_Entity
(New_N
, Empty
);
5011 -- For expanded name, we must copy the Prefix and Selector_Name
5013 if Nkind
(N
) = N_Expanded_Name
then
5015 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
5017 Set_Selector_Name
(New_N
,
5018 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
5020 -- For operators, we must copy the right operand
5022 elsif Nkind
(N
) in N_Op
then
5023 Set_Right_Opnd
(New_N
,
5024 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
5026 -- And for binary operators, the left operand as well
5028 if Nkind
(N
) in N_Binary_Op
then
5029 Set_Left_Opnd
(New_N
,
5030 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
5034 -- Special casing for stubs
5036 elsif Nkind
(N
) in N_Body_Stub
then
5038 -- In any case, we must copy the specification or defining
5039 -- identifier as appropriate.
5041 if Nkind
(N
) = N_Subprogram_Body_Stub
then
5042 Set_Specification
(New_N
,
5043 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
5046 Set_Defining_Identifier
(New_N
,
5048 (Defining_Identifier
(N
), New_N
, Instantiating
));
5051 -- If we are not instantiating, then this is where we load and
5052 -- analyze subunits, i.e. at the point where the stub occurs. A
5053 -- more permissivle system might defer this analysis to the point
5054 -- of instantiation, but this seems to complicated for now.
5056 if not Instantiating
then
5058 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
5060 Unum
: Unit_Number_Type
;
5066 (Load_Name
=> Subunit_Name
,
5071 -- If the proper body is not found, a warning message will
5072 -- be emitted when analyzing the stub, or later at the the
5073 -- point of instantiation. Here we just leave the stub as is.
5075 if Unum
= No_Unit
then
5076 Subunits_Missing
:= True;
5077 goto Subunit_Not_Found
;
5080 Subunit
:= Cunit
(Unum
);
5082 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
5083 Error_Msg_Sloc
:= Sloc
(N
);
5085 ("expected SEPARATE subunit to complete stub at#,"
5086 & " found child unit", Subunit
);
5087 goto Subunit_Not_Found
;
5090 -- We must create a generic copy of the subunit, in order
5091 -- to perform semantic analysis on it, and we must replace
5092 -- the stub in the original generic unit with the subunit,
5093 -- in order to preserve non-local references within.
5095 -- Only the proper body needs to be copied. Library_Unit and
5096 -- context clause are simply inherited by the generic copy.
5097 -- Note that the copy (which may be recursive if there are
5098 -- nested subunits) must be done first, before attaching it
5099 -- to the enclosing generic.
5103 (Proper_Body
(Unit
(Subunit
)),
5104 Empty
, Instantiating
=> False);
5106 -- Now place the original proper body in the original
5107 -- generic unit. This is a body, not a compilation unit.
5109 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
5110 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
5111 Set_Was_Originally_Stub
(N
);
5113 -- Finally replace the body of the subunit with its copy,
5114 -- and make this new subunit into the library unit of the
5115 -- generic copy, which does not have stubs any longer.
5117 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
5118 Set_Library_Unit
(New_N
, Subunit
);
5119 Inherit_Context
(Unit
(Subunit
), N
);
5122 -- If we are instantiating, this must be an error case, since
5123 -- otherwise we would have replaced the stub node by the proper
5124 -- body that corresponds. So just ignore it in the copy (i.e.
5125 -- we have copied it, and that is good enough).
5131 <<Subunit_Not_Found
>> null;
5133 -- If the node is a compilation unit, it is the subunit of a stub,
5134 -- which has been loaded already (see code below). In this case,
5135 -- the library unit field of N points to the parent unit (which
5136 -- is a compilation unit) and need not (and cannot!) be copied.
5138 -- When the proper body of the stub is analyzed, thie library_unit
5139 -- link is used to establish the proper context (see sem_ch10).
5141 -- The other fields of a compilation unit are copied as usual
5143 elsif Nkind
(N
) = N_Compilation_Unit
then
5145 -- This code can only be executed when not instantiating, because
5146 -- in the copy made for an instantiation, the compilation unit
5147 -- node has disappeared at the point that a stub is replaced by
5150 pragma Assert
(not Instantiating
);
5152 Set_Context_Items
(New_N
,
5153 Copy_Generic_List
(Context_Items
(N
), New_N
));
5156 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5158 Set_First_Inlined_Subprogram
(New_N
,
5160 (First_Inlined_Subprogram
(N
), New_N
, False));
5162 Set_Aux_Decls_Node
(New_N
,
5163 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5165 -- For an assignment node, the assignment is known to be semantically
5166 -- legal if we are instantiating the template. This avoids incorrect
5167 -- diagnostics in generated code.
5169 elsif Nkind
(N
) = N_Assignment_Statement
then
5171 -- Copy name and expression fields in usual manner
5174 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5176 Set_Expression
(New_N
,
5177 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5179 if Instantiating
then
5180 Set_Assignment_OK
(Name
(New_N
), True);
5183 elsif Nkind
(N
) = N_Aggregate
5184 or else Nkind
(N
) = N_Extension_Aggregate
5187 if not Instantiating
then
5188 Set_Associated_Node
(N
, New_N
);
5191 if Present
(Get_Associated_Node
(N
))
5192 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5194 -- In the generic the aggregate has some composite type. If at
5195 -- the point of instantiation the type has a private view,
5196 -- install the full view (and that of its ancestors, if any).
5199 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5204 and then Is_Private_Type
(T
)
5210 and then Is_Tagged_Type
(T
)
5211 and then Is_Derived_Type
(T
)
5213 Rt
:= Root_Type
(T
);
5218 if Is_Private_Type
(T
) then
5229 -- Do not copy the associated node, which points to
5230 -- the generic copy of the aggregate.
5233 use Atree
.Unchecked_Access
;
5234 -- This code section is part of the implementation of an untyped
5235 -- tree traversal, so it needs direct access to node fields.
5238 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5239 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5240 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5241 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5244 -- Allocators do not have an identifier denoting the access type,
5245 -- so we must locate it through the expression to check whether
5246 -- the views are consistent.
5248 elsif Nkind
(N
) = N_Allocator
5249 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5250 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5251 and then Instantiating
5254 T
: constant Node_Id
:=
5255 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5260 -- Retrieve the allocator node in the generic copy
5262 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5264 and then Is_Private_Type
(Acc_T
)
5266 Switch_View
(Acc_T
);
5273 -- For a proper body, we must catch the case of a proper body that
5274 -- replaces a stub. This represents the point at which a separate
5275 -- compilation unit, and hence template file, may be referenced, so
5276 -- we must make a new source instantiation entry for the template
5277 -- of the subunit, and ensure that all nodes in the subunit are
5278 -- adjusted using this new source instantiation entry.
5280 elsif Nkind
(N
) in N_Proper_Body
then
5282 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
5285 if Instantiating
and then Was_Originally_Stub
(N
) then
5286 Create_Instantiation_Source
5287 (Instantiation_Node
,
5288 Defining_Entity
(N
),
5293 -- Now copy the fields of the proper body, using the new
5294 -- adjustment factor if one was needed as per test above.
5298 -- Restore the original adjustment factor in case changed
5300 S_Adjustment
:= Save_Adjustment
;
5303 -- Don't copy Ident or Comment pragmas, since the comment belongs
5304 -- to the generic unit, not to the instantiating unit.
5306 elsif Nkind
(N
) = N_Pragma
5307 and then Instantiating
5310 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(Chars
(N
));
5313 if Prag_Id
= Pragma_Ident
5314 or else Prag_Id
= Pragma_Comment
5316 New_N
:= Make_Null_Statement
(Sloc
(N
));
5323 elsif Nkind
(N
) = N_Integer_Literal
5324 or else Nkind
(N
) = N_Real_Literal
5326 -- No descendant fields need traversing
5330 -- For the remaining nodes, copy recursively their descendants
5336 and then Nkind
(N
) = N_Subprogram_Body
5338 Set_Generic_Parent
(Specification
(New_N
), N
);
5343 end Copy_Generic_Node
;
5345 ----------------------------
5346 -- Denotes_Formal_Package --
5347 ----------------------------
5349 function Denotes_Formal_Package
5351 On_Exit
: Boolean := False) return Boolean
5354 Scop
: constant Entity_Id
:= Scope
(Pack
);
5361 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
5363 Par
:= Current_Instantiated_Parent
.Act_Id
;
5366 if Ekind
(Scop
) = E_Generic_Package
5367 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
5368 N_Generic_Subprogram_Declaration
5372 elsif Nkind
(Parent
(Pack
)) = N_Formal_Package_Declaration
then
5379 -- Check whether this package is associated with a formal
5380 -- package of the enclosing instantiation. Iterate over the
5381 -- list of renamings.
5383 E
:= First_Entity
(Par
);
5384 while Present
(E
) loop
5385 if Ekind
(E
) /= E_Package
5386 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
5389 elsif Renamed_Object
(E
) = Par
then
5392 elsif Renamed_Object
(E
) = Pack
then
5401 end Denotes_Formal_Package
;
5407 procedure End_Generic
is
5409 -- ??? More things could be factored out in this
5410 -- routine. Should probably be done at a later stage.
5412 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
5413 Generic_Flags
.Decrement_Last
;
5415 Expander_Mode_Restore
;
5418 ----------------------
5419 -- Find_Actual_Type --
5420 ----------------------
5422 function Find_Actual_Type
5424 Gen_Scope
: Entity_Id
) return Entity_Id
5429 if not Is_Child_Unit
(Gen_Scope
) then
5430 return Get_Instance_Of
(Typ
);
5432 elsif not Is_Generic_Type
(Typ
)
5433 or else Scope
(Typ
) = Gen_Scope
5435 return Get_Instance_Of
(Typ
);
5438 T
:= Current_Entity
(Typ
);
5439 while Present
(T
) loop
5440 if In_Open_Scopes
(Scope
(T
)) then
5449 end Find_Actual_Type
;
5451 ----------------------------
5452 -- Freeze_Subprogram_Body --
5453 ----------------------------
5455 procedure Freeze_Subprogram_Body
5456 (Inst_Node
: Node_Id
;
5458 Pack_Id
: Entity_Id
)
5461 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
5462 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
5467 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
5468 -- Yields True if N1 and N2 appear in the same compilation unit,
5469 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5470 -- traversal of the tree for the unit.
5472 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
5473 -- Find innermost package body that encloses the given node, and which
5474 -- is not a compilation unit. Freeze nodes for the instance, or for its
5475 -- enclosing body, may be inserted after the enclosing_body of the
5478 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
5479 -- Find entity for given package body, and locate or create a freeze
5482 function True_Parent
(N
: Node_Id
) return Node_Id
;
5483 -- For a subunit, return parent of corresponding stub
5489 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
5495 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
5496 -- Find distance from given node to enclosing compilation unit
5502 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
5505 and then Nkind
(P
) /= N_Compilation_Unit
5507 P
:= True_Parent
(P
);
5512 -- Start of procesing for Earlier
5515 Find_Depth
(P1
, D1
);
5516 Find_Depth
(P2
, D2
);
5526 P1
:= True_Parent
(P1
);
5531 P2
:= True_Parent
(P2
);
5535 -- At this point P1 and P2 are at the same distance from the root.
5536 -- We examine their parents until we find a common declarative
5537 -- list, at which point we can establish their relative placement
5538 -- by comparing their ultimate slocs. If we reach the root,
5539 -- N1 and N2 do not descend from the same declarative list (e.g.
5540 -- one is nested in the declarative part and the other is in a block
5541 -- in the statement part) and the earlier one is already frozen.
5543 while not Is_List_Member
(P1
)
5544 or else not Is_List_Member
(P2
)
5545 or else List_Containing
(P1
) /= List_Containing
(P2
)
5547 P1
:= True_Parent
(P1
);
5548 P2
:= True_Parent
(P2
);
5550 if Nkind
(Parent
(P1
)) = N_Subunit
then
5551 P1
:= Corresponding_Stub
(Parent
(P1
));
5554 if Nkind
(Parent
(P2
)) = N_Subunit
then
5555 P2
:= Corresponding_Stub
(Parent
(P2
));
5564 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
5567 --------------------
5568 -- Enclosing_Body --
5569 --------------------
5571 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
5572 P
: Node_Id
:= Parent
(N
);
5576 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
5578 if Nkind
(P
) = N_Package_Body
then
5580 if Nkind
(Parent
(P
)) = N_Subunit
then
5581 return Corresponding_Stub
(Parent
(P
));
5587 P
:= True_Parent
(P
);
5593 -------------------------
5594 -- Package_Freeze_Node --
5595 -------------------------
5597 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
5601 if Nkind
(B
) = N_Package_Body
then
5602 Id
:= Corresponding_Spec
(B
);
5604 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
5605 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
5608 Ensure_Freeze_Node
(Id
);
5609 return Freeze_Node
(Id
);
5610 end Package_Freeze_Node
;
5616 function True_Parent
(N
: Node_Id
) return Node_Id
is
5618 if Nkind
(Parent
(N
)) = N_Subunit
then
5619 return Parent
(Corresponding_Stub
(Parent
(N
)));
5625 -- Start of processing of Freeze_Subprogram_Body
5628 -- If the instance and the generic body appear within the same
5629 -- unit, and the instance preceeds the generic, the freeze node for
5630 -- the instance must appear after that of the generic. If the generic
5631 -- is nested within another instance I2, then current instance must
5632 -- be frozen after I2. In both cases, the freeze nodes are those of
5633 -- enclosing packages. Otherwise, the freeze node is placed at the end
5634 -- of the current declarative part.
5636 Enc_G
:= Enclosing_Body
(Gen_Body
);
5637 Enc_I
:= Enclosing_Body
(Inst_Node
);
5638 Ensure_Freeze_Node
(Pack_Id
);
5639 F_Node
:= Freeze_Node
(Pack_Id
);
5641 if Is_Generic_Instance
(Par
)
5642 and then Present
(Freeze_Node
(Par
))
5644 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
5646 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
5648 -- The parent was a premature instantiation. Insert freeze
5649 -- node at the end the current declarative part.
5651 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5654 Insert_After
(Freeze_Node
(Par
), F_Node
);
5657 -- The body enclosing the instance should be frozen after the body
5658 -- that includes the generic, because the body of the instance may
5659 -- make references to entities therein. If the two are not in the
5660 -- same declarative part, or if the one enclosing the instance is
5661 -- frozen already, freeze the instance at the end of the current
5662 -- declarative part.
5664 elsif Is_Generic_Instance
(Par
)
5665 and then Present
(Freeze_Node
(Par
))
5666 and then Present
(Enc_I
)
5668 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
5670 (Nkind
(Enc_I
) = N_Package_Body
5672 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
5674 -- The enclosing package may contain several instances. Rather
5675 -- than computing the earliest point at which to insert its
5676 -- freeze node, we place it at the end of the declarative part
5677 -- of the parent of the generic.
5679 Insert_After_Last_Decl
5680 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
5683 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5685 elsif Present
(Enc_G
)
5686 and then Present
(Enc_I
)
5687 and then Enc_G
/= Enc_I
5688 and then Earlier
(Inst_Node
, Gen_Body
)
5690 if Nkind
(Enc_G
) = N_Package_Body
then
5691 E_G_Id
:= Corresponding_Spec
(Enc_G
);
5692 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
5694 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
5697 -- Freeze package that encloses instance, and place node after
5698 -- package that encloses generic. If enclosing package is already
5699 -- frozen we have to assume it is at the proper place. This may
5700 -- be a potential ABE that requires dynamic checking.
5702 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
5704 -- Freeze enclosing subunit before instance
5706 Ensure_Freeze_Node
(E_G_Id
);
5708 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
5709 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
5712 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5715 -- If none of the above, insert freeze node at the end of the
5716 -- current declarative part.
5718 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5720 end Freeze_Subprogram_Body
;
5726 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
5728 return Generic_Renamings
.Table
(E
).Gen_Id
;
5731 ---------------------
5732 -- Get_Instance_Of --
5733 ---------------------
5735 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
5736 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
5739 if Res
/= Assoc_Null
then
5740 return Generic_Renamings
.Table
(Res
).Act_Id
;
5742 -- On exit, entity is not instantiated: not a generic parameter,
5743 -- or else parameter of an inner generic unit.
5747 end Get_Instance_Of
;
5749 ------------------------------------
5750 -- Get_Package_Instantiation_Node --
5751 ------------------------------------
5753 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
5754 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
5758 -- If the instantiation is a compilation unit that does not need a
5759 -- body then the instantiation node has been rewritten as a package
5760 -- declaration for the instance, and we return the original node.
5762 -- If it is a compilation unit and the instance node has not been
5763 -- rewritten, then it is still the unit of the compilation. Finally,
5764 -- if a body is present, this is a parent of the main unit whose body
5765 -- has been compiled for inlining purposes, and the instantiation node
5766 -- has been rewritten with the instance body.
5768 -- Otherwise the instantiation node appears after the declaration.
5769 -- If the entity is a formal package, the declaration may have been
5770 -- rewritten as a generic declaration (in the case of a formal with a
5771 -- box) or left as a formal package declaration if it has actuals, and
5772 -- is found with a forward search.
5774 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
5775 if Nkind
(Decl
) = N_Package_Declaration
5776 and then Present
(Corresponding_Body
(Decl
))
5778 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
5781 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
5782 return Original_Node
(Decl
);
5784 return Unit
(Parent
(Decl
));
5787 elsif Nkind
(Decl
) = N_Generic_Package_Declaration
5788 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
5790 return Original_Node
(Decl
);
5793 Inst
:= Next
(Decl
);
5794 while Nkind
(Inst
) /= N_Package_Instantiation
5795 and then Nkind
(Inst
) /= N_Formal_Package_Declaration
5802 end Get_Package_Instantiation_Node
;
5804 ------------------------
5805 -- Has_Been_Exchanged --
5806 ------------------------
5808 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
5809 Next
: Elmt_Id
:= First_Elmt
(Exchanged_Views
);
5812 while Present
(Next
) loop
5813 if Full_View
(Node
(Next
)) = E
then
5821 end Has_Been_Exchanged
;
5827 function Hash
(F
: Entity_Id
) return HTable_Range
is
5829 return HTable_Range
(F
mod HTable_Size
);
5832 ------------------------
5833 -- Hide_Current_Scope --
5834 ------------------------
5836 procedure Hide_Current_Scope
is
5837 C
: constant Entity_Id
:= Current_Scope
;
5841 Set_Is_Hidden_Open_Scope
(C
);
5842 E
:= First_Entity
(C
);
5844 while Present
(E
) loop
5845 if Is_Immediately_Visible
(E
) then
5846 Set_Is_Immediately_Visible
(E
, False);
5847 Append_Elmt
(E
, Hidden_Entities
);
5853 -- Make the scope name invisible as well. This is necessary, but
5854 -- might conflict with calls to Rtsfind later on, in case the scope
5855 -- is a predefined one. There is no clean solution to this problem, so
5856 -- for now we depend on the user not redefining Standard itself in one
5857 -- of the parent units.
5859 if Is_Immediately_Visible
(C
)
5860 and then C
/= Standard_Standard
5862 Set_Is_Immediately_Visible
(C
, False);
5863 Append_Elmt
(C
, Hidden_Entities
);
5866 end Hide_Current_Scope
;
5872 procedure Init_Env
is
5873 Saved
: Instance_Env
;
5876 Saved
.Ada_Version
:= Ada_Version
;
5877 Saved
.Ada_Version_Explicit
:= Ada_Version_Explicit
;
5878 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
5879 Saved
.Exchanged_Views
:= Exchanged_Views
;
5880 Saved
.Hidden_Entities
:= Hidden_Entities
;
5881 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
5882 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
5883 Instance_Envs
.Increment_Last
;
5884 Instance_Envs
.Table
(Instance_Envs
.Last
) := Saved
;
5886 Exchanged_Views
:= New_Elmt_List
;
5887 Hidden_Entities
:= New_Elmt_List
;
5889 -- Make dummy entry for Instantiated parent. If generic unit is
5890 -- legal, this is set properly in Set_Instance_Env.
5892 Current_Instantiated_Parent
:=
5893 (Current_Scope
, Current_Scope
, Assoc_Null
);
5896 ------------------------------
5897 -- In_Same_Declarative_Part --
5898 ------------------------------
5900 function In_Same_Declarative_Part
5902 Inst
: Node_Id
) return Boolean
5904 Decls
: constant Node_Id
:= Parent
(F_Node
);
5905 Nod
: Node_Id
:= Parent
(Inst
);
5908 while Present
(Nod
) loop
5912 elsif Nkind
(Nod
) = N_Subprogram_Body
5913 or else Nkind
(Nod
) = N_Package_Body
5914 or else Nkind
(Nod
) = N_Task_Body
5915 or else Nkind
(Nod
) = N_Protected_Body
5916 or else Nkind
(Nod
) = N_Block_Statement
5920 elsif Nkind
(Nod
) = N_Subunit
then
5921 Nod
:= Corresponding_Stub
(Nod
);
5923 elsif Nkind
(Nod
) = N_Compilation_Unit
then
5926 Nod
:= Parent
(Nod
);
5931 end In_Same_Declarative_Part
;
5933 ---------------------
5934 -- In_Main_Context --
5935 ---------------------
5937 function In_Main_Context
(E
: Entity_Id
) return Boolean is
5943 if not Is_Compilation_Unit
(E
)
5944 or else Ekind
(E
) /= E_Package
5945 or else In_Private_Part
(E
)
5950 Context
:= Context_Items
(Cunit
(Main_Unit
));
5952 Clause
:= First
(Context
);
5953 while Present
(Clause
) loop
5954 if Nkind
(Clause
) = N_With_Clause
then
5955 Nam
:= Name
(Clause
);
5957 -- If the current scope is part of the context of the main unit,
5958 -- analysis of the corresponding with_clause is not complete, and
5959 -- the entity is not set. We use the Chars field directly, which
5960 -- might produce false positives in rare cases, but guarantees
5961 -- that we produce all the instance bodies we will need.
5963 if (Nkind
(Nam
) = N_Identifier
5964 and then Chars
(Nam
) = Chars
(E
))
5965 or else (Nkind
(Nam
) = N_Selected_Component
5966 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
5976 end In_Main_Context
;
5978 ---------------------
5979 -- Inherit_Context --
5980 ---------------------
5982 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
5983 Current_Context
: List_Id
;
5984 Current_Unit
: Node_Id
;
5989 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
5991 -- The inherited context is attached to the enclosing compilation
5992 -- unit. This is either the main unit, or the declaration for the
5993 -- main unit (in case the instantation appears within the package
5994 -- declaration and the main unit is its body).
5996 Current_Unit
:= Parent
(Inst
);
5997 while Present
(Current_Unit
)
5998 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
6000 Current_Unit
:= Parent
(Current_Unit
);
6003 Current_Context
:= Context_Items
(Current_Unit
);
6005 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
6006 while Present
(Item
) loop
6007 if Nkind
(Item
) = N_With_Clause
then
6008 New_I
:= New_Copy
(Item
);
6009 Set_Implicit_With
(New_I
, True);
6010 Append
(New_I
, Current_Context
);
6016 end Inherit_Context
;
6022 procedure Initialize
is
6024 Generic_Renamings
.Init
;
6027 Generic_Renamings_HTable
.Reset
;
6028 Circularity_Detected
:= False;
6029 Exchanged_Views
:= No_Elist
;
6030 Hidden_Entities
:= No_Elist
;
6033 ----------------------------
6034 -- Insert_After_Last_Decl --
6035 ----------------------------
6037 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
6038 L
: List_Id
:= List_Containing
(N
);
6039 P
: constant Node_Id
:= Parent
(L
);
6042 if not Is_List_Member
(F_Node
) then
6043 if Nkind
(P
) = N_Package_Specification
6044 and then L
= Visible_Declarations
(P
)
6045 and then Present
(Private_Declarations
(P
))
6046 and then not Is_Empty_List
(Private_Declarations
(P
))
6048 L
:= Private_Declarations
(P
);
6051 Insert_After
(Last
(L
), F_Node
);
6053 end Insert_After_Last_Decl
;
6059 procedure Install_Body
6060 (Act_Body
: Node_Id
;
6065 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
6066 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
6067 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
6068 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
6069 Gen_Unit
: constant Node_Id
:=
6070 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
6071 Orig_Body
: Node_Id
:= Gen_Body
;
6073 Body_Unit
: Node_Id
;
6075 Must_Delay
: Boolean;
6077 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
6078 -- Find subprogram (if any) that encloses instance and/or generic body
6080 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
6081 -- If the instance is nested inside a generic unit, the Sloc of the
6082 -- instance indicates the place of the original definition, not the
6083 -- point of the current enclosing instance. Pending a better usage of
6084 -- Slocs to indicate instantiation places, we determine the place of
6085 -- origin of a node by finding the maximum sloc of any ancestor node.
6086 -- Why is this not equivalent to Top_Level_Location ???
6088 --------------------
6089 -- Enclosing_Subp --
6090 --------------------
6092 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
6093 Scop
: Entity_Id
:= Scope
(Id
);
6096 while Scop
/= Standard_Standard
6097 and then not Is_Overloadable
(Scop
)
6099 Scop
:= Scope
(Scop
);
6109 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
6116 while Present
(N1
) and then N1
/= Act_Unit
loop
6117 if Sloc
(N1
) > Res
then
6127 -- Start of processing for Install_Body
6130 -- If the body is a subunit, the freeze point is the corresponding
6131 -- stub in the current compilation, not the subunit itself.
6133 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
6134 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6136 Orig_Body
:= Gen_Body
;
6139 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6141 -- If the instantiation and the generic definition appear in the
6142 -- same package declaration, this is an early instantiation.
6143 -- If they appear in the same declarative part, it is an early
6144 -- instantiation only if the generic body appears textually later,
6145 -- and the generic body is also in the main unit.
6147 -- If instance is nested within a subprogram, and the generic body is
6148 -- not, the instance is delayed because the enclosing body is. If
6149 -- instance and body are within the same scope, or the same sub-
6150 -- program body, indicate explicitly that the instance is delayed.
6153 (Gen_Unit
= Act_Unit
6154 and then ((Nkind
(Gen_Unit
) = N_Package_Declaration
)
6155 or else Nkind
(Gen_Unit
) = N_Generic_Package_Declaration
6156 or else (Gen_Unit
= Body_Unit
6157 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6158 and then Is_In_Main_Unit
(Gen_Unit
)
6159 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6161 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6163 -- If this is an early instantiation, the freeze node is placed after
6164 -- the generic body. Otherwise, if the generic appears in an instance,
6165 -- we cannot freeze the current instance until the outer one is frozen.
6166 -- This is only relevant if the current instance is nested within some
6167 -- inner scope not itself within the outer instance. If this scope is
6168 -- a package body in the same declarative part as the outer instance,
6169 -- then that body needs to be frozen after the outer instance. Finally,
6170 -- if no delay is needed, we place the freeze node at the end of the
6171 -- current declarative part.
6173 if Expander_Active
then
6174 Ensure_Freeze_Node
(Act_Id
);
6175 F_Node
:= Freeze_Node
(Act_Id
);
6178 Insert_After
(Orig_Body
, F_Node
);
6180 elsif Is_Generic_Instance
(Par
)
6181 and then Present
(Freeze_Node
(Par
))
6182 and then Scope
(Act_Id
) /= Par
6184 -- Freeze instance of inner generic after instance of enclosing
6187 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
6188 Insert_After
(Freeze_Node
(Par
), F_Node
);
6190 -- Freeze package enclosing instance of inner generic after
6191 -- instance of enclosing generic.
6193 elsif Nkind
(Parent
(N
)) = N_Package_Body
6194 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
6198 Enclosing
: constant Entity_Id
:=
6199 Corresponding_Spec
(Parent
(N
));
6202 Insert_After_Last_Decl
(N
, F_Node
);
6203 Ensure_Freeze_Node
(Enclosing
);
6205 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
6206 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
6211 Insert_After_Last_Decl
(N
, F_Node
);
6215 Insert_After_Last_Decl
(N
, F_Node
);
6219 Set_Is_Frozen
(Act_Id
);
6220 Insert_Before
(N
, Act_Body
);
6221 Mark_Rewrite_Insertion
(Act_Body
);
6224 --------------------
6225 -- Install_Parent --
6226 --------------------
6228 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
6229 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
6230 S
: constant Entity_Id
:= Current_Scope
;
6231 Inst_Par
: Entity_Id
;
6232 First_Par
: Entity_Id
;
6233 Inst_Node
: Node_Id
;
6234 Gen_Par
: Entity_Id
;
6235 First_Gen
: Entity_Id
;
6238 procedure Install_Formal_Packages
(Par
: Entity_Id
);
6239 -- If any of the formals of the parent are formal packages with box,
6240 -- their formal parts are visible in the parent and thus in the child
6241 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6242 -- for the unit itself.
6244 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
6245 -- Install the scopes of noninstance parent units ending with Par
6247 procedure Install_Spec
(Par
: Entity_Id
);
6248 -- The child unit is within the declarative part of the parent, so
6249 -- the declarations within the parent are immediately visible.
6251 -----------------------------
6252 -- Install_Formal_Packages --
6253 -----------------------------
6255 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
6259 E
:= First_Entity
(Par
);
6260 while Present
(E
) loop
6261 if Ekind
(E
) = E_Package
6262 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6264 -- If this is the renaming for the parent instance, done
6266 if Renamed_Object
(E
) = Par
then
6269 -- The visibility of a formal of an enclosing generic is
6272 elsif Denotes_Formal_Package
(E
) then
6275 elsif Present
(Associated_Formal_Package
(E
))
6276 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
6278 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6279 Set_Is_Hidden
(E
, False);
6285 end Install_Formal_Packages
;
6287 -------------------------------
6288 -- Install_Noninstance_Specs --
6289 -------------------------------
6291 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
6294 and then Par
/= Standard_Standard
6295 and then not In_Open_Scopes
(Par
)
6297 Install_Noninstance_Specs
(Scope
(Par
));
6300 end Install_Noninstance_Specs
;
6306 procedure Install_Spec
(Par
: Entity_Id
) is
6307 Spec
: constant Node_Id
:=
6308 Specification
(Unit_Declaration_Node
(Par
));
6311 if not Is_Child_Unit
(Par
) then
6312 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
6316 Set_Is_Immediately_Visible
(Par
);
6317 Install_Visible_Declarations
(Par
);
6318 Install_Private_Declarations
(Par
);
6319 Set_Use
(Visible_Declarations
(Spec
));
6320 Set_Use
(Private_Declarations
(Spec
));
6323 -- Start of processing for Install_Parent
6326 -- We need to install the parent instance to compile the instantiation
6327 -- of the child, but the child instance must appear in the current
6328 -- scope. Given that we cannot place the parent above the current
6329 -- scope in the scope stack, we duplicate the current scope and unstack
6330 -- both after the instantiation is complete.
6332 -- If the parent is itself the instantiation of a child unit, we must
6333 -- also stack the instantiation of its parent, and so on. Each such
6334 -- ancestor is the prefix of the name in a prior instantiation.
6336 -- If this is a nested instance, the parent unit itself resolves to
6337 -- a renaming of the parent instance, whose declaration we need.
6339 -- Finally, the parent may be a generic (not an instance) when the
6340 -- child unit appears as a formal package.
6344 if Present
(Renamed_Entity
(Inst_Par
)) then
6345 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6348 First_Par
:= Inst_Par
;
6351 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
6353 First_Gen
:= Gen_Par
;
6355 while Present
(Gen_Par
)
6356 and then Is_Child_Unit
(Gen_Par
)
6358 -- Load grandparent instance as well
6360 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
6362 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
6363 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
6365 if Present
(Renamed_Entity
(Inst_Par
)) then
6366 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6371 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
6373 if Present
(Gen_Par
) then
6374 Prepend_Elmt
(Inst_Par
, Ancestors
);
6377 -- Parent is not the name of an instantiation
6379 Install_Noninstance_Specs
(Inst_Par
);
6391 if Present
(First_Gen
) then
6392 Append_Elmt
(First_Par
, Ancestors
);
6395 Install_Noninstance_Specs
(First_Par
);
6398 if not Is_Empty_Elmt_List
(Ancestors
) then
6399 Elmt
:= First_Elmt
(Ancestors
);
6401 while Present
(Elmt
) loop
6402 Install_Spec
(Node
(Elmt
));
6403 Install_Formal_Packages
(Node
(Elmt
));
6414 --------------------------------
6415 -- Instantiate_Formal_Package --
6416 --------------------------------
6418 function Instantiate_Formal_Package
6421 Analyzed_Formal
: Node_Id
) return List_Id
6423 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6424 Actual_Pack
: Entity_Id
;
6425 Formal_Pack
: Entity_Id
;
6426 Gen_Parent
: Entity_Id
;
6429 Parent_Spec
: Node_Id
;
6431 procedure Find_Matching_Actual
6433 Act
: in out Entity_Id
);
6434 -- We need to associate each formal entity in the formal package
6435 -- with the corresponding entity in the actual package. The actual
6436 -- package has been analyzed and possibly expanded, and as a result
6437 -- there is no one-to-one correspondence between the two lists (for
6438 -- example, the actual may include subtypes, itypes, and inherited
6439 -- primitive operations, interspersed among the renaming declarations
6440 -- for the actuals) . We retrieve the corresponding actual by name
6441 -- because each actual has the same name as the formal, and they do
6442 -- appear in the same order.
6444 function Formal_Entity
6446 Act_Ent
: Entity_Id
) return Entity_Id
;
6447 -- Returns the entity associated with the given formal F. In the
6448 -- case where F is a formal package, this function will iterate
6449 -- through all of F's formals and enter map associations from the
6450 -- actuals occurring in the formal package's corresponding actual
6451 -- package (obtained via Act_Ent) to the formal package's formal
6452 -- parameters. This function is called recursively for arbitrary
6453 -- levels of formal packages.
6455 function Is_Instance_Of
6456 (Act_Spec
: Entity_Id
;
6457 Gen_Anc
: Entity_Id
) return Boolean;
6458 -- The actual can be an instantiation of a generic within another
6459 -- instance, in which case there is no direct link from it to the
6460 -- original generic ancestor. In that case, we recognize that the
6461 -- ultimate ancestor is the same by examining names and scopes.
6463 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
6464 -- Within the generic part, entities in the formal package are
6465 -- visible. To validate subsequent type declarations, indicate
6466 -- the correspondence betwen the entities in the analyzed formal,
6467 -- and the entities in the actual package. There are three packages
6468 -- involved in the instantiation of a formal package: the parent
6469 -- generic P1 which appears in the generic declaration, the fake
6470 -- instantiation P2 which appears in the analyzed generic, and whose
6471 -- visible entities may be used in subsequent formals, and the actual
6472 -- P3 in the instance. To validate subsequent formals, me indicate
6473 -- that the entities in P2 are mapped into those of P3. The mapping of
6474 -- entities has to be done recursively for nested packages.
6476 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
6477 -- If the current formal is declared with a box, its own formals are
6478 -- visible in the instance, as they were in the generic, and their
6479 -- Hidden flag must be reset. If some of these formals are themselves
6480 -- packages declared with a box, the processing must be recursive.
6482 --------------------------
6483 -- Find_Matching_Actual --
6484 --------------------------
6486 procedure Find_Matching_Actual
6488 Act
: in out Entity_Id
)
6490 Formal_Ent
: Entity_Id
;
6493 case Nkind
(Original_Node
(F
)) is
6494 when N_Formal_Object_Declaration |
6495 N_Formal_Type_Declaration
=>
6496 Formal_Ent
:= Defining_Identifier
(F
);
6498 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6502 when N_Formal_Subprogram_Declaration |
6503 N_Formal_Package_Declaration |
6504 N_Package_Declaration |
6505 N_Generic_Package_Declaration
=>
6506 Formal_Ent
:= Defining_Entity
(F
);
6508 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6513 raise Program_Error
;
6515 end Find_Matching_Actual
;
6521 function Formal_Entity
6523 Act_Ent
: Entity_Id
) return Entity_Id
6525 Orig_Node
: Node_Id
:= F
;
6526 Act_Pkg
: Entity_Id
;
6529 case Nkind
(Original_Node
(F
)) is
6530 when N_Formal_Object_Declaration
=>
6531 return Defining_Identifier
(F
);
6533 when N_Formal_Type_Declaration
=>
6534 return Defining_Identifier
(F
);
6536 when N_Formal_Subprogram_Declaration
=>
6537 return Defining_Unit_Name
(Specification
(F
));
6539 when N_Package_Declaration
=>
6540 return Defining_Unit_Name
(Specification
(F
));
6542 when N_Formal_Package_Declaration |
6543 N_Generic_Package_Declaration
=>
6545 if Nkind
(F
) = N_Generic_Package_Declaration
then
6546 Orig_Node
:= Original_Node
(F
);
6551 -- Find matching actual package, skipping over itypes and
6552 -- other entities generated when analyzing the formal. We
6553 -- know that if the instantiation is legal then there is
6554 -- a matching package for the formal.
6556 while Ekind
(Act_Pkg
) /= E_Package
loop
6557 Act_Pkg
:= Next_Entity
(Act_Pkg
);
6561 Actual_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
6562 Formal_Node
: Node_Id
;
6563 Formal_Ent
: Entity_Id
;
6569 -- The actual may be a renamed generic package, in which
6570 -- case we want to retrieve the original generic in order
6571 -- to traverse its formal part.
6573 if Present
(Renamed_Entity
(Entity
(Name
(Orig_Node
)))) then
6575 Unit_Declaration_Node
(
6576 Renamed_Entity
(Entity
(Name
(Orig_Node
))));
6579 Unit_Declaration_Node
(Entity
(Name
(Orig_Node
)));
6582 Formals
:= Generic_Formal_Declarations
(Gen_Decl
);
6584 if Present
(Formals
) then
6585 Formal_Node
:= First_Non_Pragma
(Formals
);
6587 Formal_Node
:= Empty
;
6590 while Present
(Actual_Ent
)
6591 and then Present
(Formal_Node
)
6592 and then Actual_Ent
/= First_Private_Entity
(Act_Pkg
)
6594 -- ??? Are the following calls also needed here:
6596 -- Set_Is_Hidden (Actual_Ent, False);
6597 -- Set_Is_Potentially_Use_Visible
6598 -- (Actual_Ent, In_Use (Act_Ent));
6600 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6601 if Present
(Formal_Ent
) then
6602 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6604 Next_Non_Pragma
(Formal_Node
);
6606 Next_Entity
(Actual_Ent
);
6610 return Defining_Identifier
(Orig_Node
);
6612 when N_Use_Package_Clause
=>
6615 when N_Use_Type_Clause
=>
6618 -- We return Empty for all other encountered forms of
6619 -- declarations because there are some cases of nonformal
6620 -- sorts of declaration that can show up (e.g., when array
6621 -- formals are present). Since it's not clear what kinds
6622 -- can appear among the formals, we won't raise failure here.
6630 --------------------
6631 -- Is_Instance_Of --
6632 --------------------
6634 function Is_Instance_Of
6635 (Act_Spec
: Entity_Id
;
6636 Gen_Anc
: Entity_Id
) return Boolean
6638 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
6641 if No
(Gen_Par
) then
6644 -- Simplest case: the generic parent of the actual is the formal
6646 elsif Gen_Par
= Gen_Anc
then
6649 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
6652 -- The actual may be obtained through several instantiations. Its
6653 -- scope must itself be an instance of a generic declared in the
6654 -- same scope as the formal. Any other case is detected above.
6656 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
6660 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
6668 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
6673 Set_Instance_Of
(Form
, Act
);
6675 -- Traverse formal and actual package to map the corresponding
6676 -- entities. We skip over internal entities that may be generated
6677 -- during semantic analysis, and find the matching entities by
6678 -- name, given that they must appear in the same order.
6680 E1
:= First_Entity
(Form
);
6681 E2
:= First_Entity
(Act
);
6683 and then E1
/= First_Private_Entity
(Form
)
6685 if not Is_Internal
(E1
)
6686 and then not Is_Class_Wide_Type
(E1
)
6687 and then Present
(Parent
(E1
))
6690 and then Chars
(E2
) /= Chars
(E1
)
6698 Set_Instance_Of
(E1
, E2
);
6701 and then Is_Tagged_Type
(E2
)
6704 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
6707 if Ekind
(E1
) = E_Package
6708 and then No
(Renamed_Object
(E1
))
6710 Map_Entities
(E1
, E2
);
6719 ---------------------------
6720 -- Process_Nested_Formal --
6721 ---------------------------
6723 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
6727 if Present
(Associated_Formal_Package
(Formal
))
6728 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
6730 Ent
:= First_Entity
(Formal
);
6731 while Present
(Ent
) loop
6732 Set_Is_Hidden
(Ent
, False);
6733 Set_Is_Potentially_Use_Visible
6734 (Ent
, Is_Potentially_Use_Visible
(Formal
));
6736 if Ekind
(Ent
) = E_Package
then
6737 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
6738 Process_Nested_Formal
(Ent
);
6744 end Process_Nested_Formal
;
6746 -- Start of processing for Instantiate_Formal_Package
6751 if not Is_Entity_Name
(Actual
)
6752 or else Ekind
(Entity
(Actual
)) /= E_Package
6755 ("expect package instance to instantiate formal", Actual
);
6756 Abandon_Instantiation
(Actual
);
6757 raise Program_Error
;
6760 Actual_Pack
:= Entity
(Actual
);
6761 Set_Is_Instantiated
(Actual_Pack
);
6763 -- The actual may be a renamed package, or an outer generic
6764 -- formal package whose instantiation is converted into a renaming.
6766 if Present
(Renamed_Object
(Actual_Pack
)) then
6767 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
6770 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
6771 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
6772 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
6775 Generic_Parent
(Specification
(Analyzed_Formal
));
6777 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6780 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
6781 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
6783 Parent_Spec
:= Parent
(Actual_Pack
);
6786 if Gen_Parent
= Any_Id
then
6788 ("previous error in declaration of formal package", Actual
);
6789 Abandon_Instantiation
(Actual
);
6792 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
6798 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
6799 Abandon_Instantiation
(Actual
);
6802 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
6803 Map_Entities
(Formal_Pack
, Actual_Pack
);
6806 Make_Package_Renaming_Declaration
(Loc
,
6807 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
6808 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
6810 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
6811 Defining_Identifier
(Formal
));
6812 Decls
:= New_List
(Nod
);
6814 -- If the formal F has a box, then the generic declarations are
6815 -- visible in the generic G. In an instance of G, the corresponding
6816 -- entities in the actual for F (which are the actuals for the
6817 -- instantiation of the generic that F denotes) must also be made
6818 -- visible for analysis of the current instance. On exit from the
6819 -- current instance, those entities are made private again. If the
6820 -- actual is currently in use, these entities are also use-visible.
6822 -- The loop through the actual entities also steps through the
6823 -- formal entities and enters associations from formals to
6824 -- actuals into the renaming map. This is necessary to properly
6825 -- handle checking of actual parameter associations for later
6826 -- formals that depend on actuals declared in the formal package.
6828 if Box_Present
(Formal
) then
6830 Gen_Decl
: constant Node_Id
:=
6831 Unit_Declaration_Node
(Gen_Parent
);
6832 Formals
: constant List_Id
:=
6833 Generic_Formal_Declarations
(Gen_Decl
);
6834 Actual_Ent
: Entity_Id
;
6835 Formal_Node
: Node_Id
;
6836 Formal_Ent
: Entity_Id
;
6839 if Present
(Formals
) then
6840 Formal_Node
:= First_Non_Pragma
(Formals
);
6842 Formal_Node
:= Empty
;
6845 Actual_Ent
:= First_Entity
(Actual_Pack
);
6847 while Present
(Actual_Ent
)
6848 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
6850 Set_Is_Hidden
(Actual_Ent
, False);
6851 Set_Is_Potentially_Use_Visible
6852 (Actual_Ent
, In_Use
(Actual_Pack
));
6854 if Ekind
(Actual_Ent
) = E_Package
then
6855 Process_Nested_Formal
(Actual_Ent
);
6858 if Present
(Formal_Node
) then
6859 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6861 if Present
(Formal_Ent
) then
6862 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
6863 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6866 Next_Non_Pragma
(Formal_Node
);
6869 -- No further formals to match, but the generic
6870 -- part may contain inherited operation that are
6871 -- not hidden in the enclosing instance.
6873 Next_Entity
(Actual_Ent
);
6879 -- If the formal is not declared with a box, reanalyze it as
6880 -- an instantiation, to verify the matching rules of 12.7. The
6881 -- actual checks are performed after the generic associations
6886 I_Pack
: constant Entity_Id
:=
6887 Make_Defining_Identifier
(Sloc
(Actual
),
6888 Chars
=> New_Internal_Name
('P'));
6891 Set_Is_Internal
(I_Pack
);
6894 Make_Package_Instantiation
(Sloc
(Actual
),
6895 Defining_Unit_Name
=> I_Pack
,
6896 Name
=> New_Occurrence_Of
(Gen_Parent
, Sloc
(Actual
)),
6897 Generic_Associations
=>
6898 Generic_Associations
(Formal
)));
6904 end Instantiate_Formal_Package
;
6906 -----------------------------------
6907 -- Instantiate_Formal_Subprogram --
6908 -----------------------------------
6910 function Instantiate_Formal_Subprogram
6913 Analyzed_Formal
: Node_Id
) return Node_Id
6915 Loc
: Source_Ptr
:= Sloc
(Instantiation_Node
);
6916 Formal_Sub
: constant Entity_Id
:=
6917 Defining_Unit_Name
(Specification
(Formal
));
6918 Analyzed_S
: constant Entity_Id
:=
6919 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6920 Decl_Node
: Node_Id
;
6924 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
6925 -- If the generic is a child unit, the parent has been installed on the
6926 -- scope stack, but a default subprogram cannot resolve to something on
6927 -- the parent because that parent is not really part of the visible
6928 -- context (it is there to resolve explicit local entities). If the
6929 -- default has resolved in this way, we remove the entity from
6930 -- immediate visibility and analyze the node again to emit an error
6931 -- message or find another visible candidate.
6933 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
6934 -- Perform legality check and raise exception on failure
6936 -----------------------
6937 -- From_Parent_Scope --
6938 -----------------------
6940 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
6941 Gen_Scope
: Node_Id
:= Scope
(Analyzed_S
);
6944 while Present
(Gen_Scope
)
6945 and then Is_Child_Unit
(Gen_Scope
)
6947 if Scope
(Subp
) = Scope
(Gen_Scope
) then
6951 Gen_Scope
:= Scope
(Gen_Scope
);
6955 end From_Parent_Scope
;
6957 -----------------------------
6958 -- Valid_Actual_Subprogram --
6959 -----------------------------
6961 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
6962 Act_E
: Entity_Id
:= Empty
;
6965 if Is_Entity_Name
(Act
) then
6966 Act_E
:= Entity
(Act
);
6967 elsif Nkind
(Act
) = N_Selected_Component
6968 and then Is_Entity_Name
(Selector_Name
(Act
))
6970 Act_E
:= Entity
(Selector_Name
(Act
));
6973 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
6974 or else Nkind
(Act
) = N_Attribute_Reference
6975 or else Nkind
(Act
) = N_Indexed_Component
6976 or else Nkind
(Act
) = N_Character_Literal
6977 or else Nkind
(Act
) = N_Explicit_Dereference
6983 ("expect subprogram or entry name in instantiation of&",
6984 Instantiation_Node
, Formal_Sub
);
6985 Abandon_Instantiation
(Instantiation_Node
);
6987 end Valid_Actual_Subprogram
;
6989 -- Start of processing for Instantiate_Formal_Subprogram
6992 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
6994 -- Create new entity for the actual (New_Copy_Tree does not)
6996 Set_Defining_Unit_Name
6997 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6999 -- Find entity of actual. If the actual is an attribute reference, it
7000 -- cannot be resolved here (its formal is missing) but is handled
7001 -- instead in Attribute_Renaming. If the actual is overloaded, it is
7002 -- fully resolved subsequently, when the renaming declaration for the
7003 -- formal is analyzed. If it is an explicit dereference, resolve the
7004 -- prefix but not the actual itself, to prevent interpretation as a
7007 if Present
(Actual
) then
7008 Loc
:= Sloc
(Actual
);
7009 Set_Sloc
(New_Spec
, Loc
);
7011 if Nkind
(Actual
) = N_Operator_Symbol
then
7012 Find_Direct_Name
(Actual
);
7014 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
7015 Analyze
(Prefix
(Actual
));
7017 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
7021 Valid_Actual_Subprogram
(Actual
);
7024 elsif Present
(Default_Name
(Formal
)) then
7025 if Nkind
(Default_Name
(Formal
)) /= N_Attribute_Reference
7026 and then Nkind
(Default_Name
(Formal
)) /= N_Selected_Component
7027 and then Nkind
(Default_Name
(Formal
)) /= N_Indexed_Component
7028 and then Nkind
(Default_Name
(Formal
)) /= N_Character_Literal
7029 and then Present
(Entity
(Default_Name
(Formal
)))
7031 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
7033 Nam
:= New_Copy
(Default_Name
(Formal
));
7034 Set_Sloc
(Nam
, Loc
);
7037 elsif Box_Present
(Formal
) then
7039 -- Actual is resolved at the point of instantiation. Create
7040 -- an identifier or operator with the same name as the formal.
7042 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
7043 Nam
:= Make_Operator_Symbol
(Loc
,
7044 Chars
=> Chars
(Formal_Sub
),
7045 Strval
=> No_String
);
7047 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
7050 elsif Nkind
(Specification
(Formal
)) = N_Procedure_Specification
7051 and then Null_Present
(Specification
(Formal
))
7053 -- Generate null body for procedure, for use in the instance
7056 Make_Subprogram_Body
(Loc
,
7057 Specification
=> New_Spec
,
7058 Declarations
=> New_List
,
7059 Handled_Statement_Sequence
=>
7060 Make_Handled_Sequence_Of_Statements
(Loc
,
7061 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
7063 Set_Is_Intrinsic_Subprogram
(Defining_Unit_Name
(New_Spec
));
7067 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
7069 ("missing actual&", Instantiation_Node
, Formal_Sub
);
7071 ("\in instantiation of & declared#",
7072 Instantiation_Node
, Scope
(Analyzed_S
));
7073 Abandon_Instantiation
(Instantiation_Node
);
7077 Make_Subprogram_Renaming_Declaration
(Loc
,
7078 Specification
=> New_Spec
,
7081 -- If we do not have an actual and the formal specified <> then
7082 -- set to get proper default.
7084 if No
(Actual
) and then Box_Present
(Formal
) then
7085 Set_From_Default
(Decl_Node
);
7088 -- Gather possible interpretations for the actual before analyzing the
7089 -- instance. If overloaded, it will be resolved when analyzing the
7090 -- renaming declaration.
7092 if Box_Present
(Formal
)
7093 and then No
(Actual
)
7097 if Is_Child_Unit
(Scope
(Analyzed_S
))
7098 and then Present
(Entity
(Nam
))
7100 if not Is_Overloaded
(Nam
) then
7102 if From_Parent_Scope
(Entity
(Nam
)) then
7103 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
7104 Set_Entity
(Nam
, Empty
);
7105 Set_Etype
(Nam
, Empty
);
7109 Set_Is_Immediately_Visible
(Entity
(Nam
));
7118 Get_First_Interp
(Nam
, I
, It
);
7120 while Present
(It
.Nam
) loop
7121 if From_Parent_Scope
(It
.Nam
) then
7125 Get_Next_Interp
(I
, It
);
7132 -- The generic instantiation freezes the actual. This can only be
7133 -- done once the actual is resolved, in the analysis of the renaming
7134 -- declaration. To make the formal subprogram entity available, we set
7135 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7136 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7137 -- of formal abstract subprograms.
7139 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
7141 -- We cannot analyze the renaming declaration, and thus find the
7142 -- actual, until the all the actuals are assembled in the instance.
7143 -- For subsequent checks of other actuals, indicate the node that
7144 -- will hold the instance of this formal.
7146 Set_Instance_Of
(Analyzed_S
, Nam
);
7148 if Nkind
(Actual
) = N_Selected_Component
7149 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
7150 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
7152 -- The renaming declaration will create a body, which must appear
7153 -- outside of the instantiation, We move the renaming declaration
7154 -- out of the instance, and create an additional renaming inside,
7155 -- to prevent freezing anomalies.
7158 Anon_Id
: constant Entity_Id
:=
7159 Make_Defining_Identifier
7160 (Loc
, New_Internal_Name
('E'));
7162 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
7163 Insert_Before
(Instantiation_Node
, Decl_Node
);
7164 Analyze
(Decl_Node
);
7166 -- Now create renaming within the instance
7169 Make_Subprogram_Renaming_Declaration
(Loc
,
7170 Specification
=> New_Copy_Tree
(New_Spec
),
7171 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7173 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
7174 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7179 end Instantiate_Formal_Subprogram
;
7181 ------------------------
7182 -- Instantiate_Object --
7183 ------------------------
7185 function Instantiate_Object
7188 Analyzed_Formal
: Node_Id
) return List_Id
7190 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7191 Type_Id
: constant Node_Id
:= Subtype_Mark
(Formal
);
7192 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7193 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
7194 Orig_Ftyp
: constant Entity_Id
:=
7195 Etype
(Defining_Identifier
(Analyzed_Formal
));
7196 List
: constant List_Id
:= New_List
;
7198 Decl_Node
: Node_Id
;
7199 Subt_Decl
: Node_Id
:= Empty
;
7202 -- Sloc for error message on missing actual
7204 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
7206 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
7207 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
7210 Set_Parent
(List
, Parent
(Actual
));
7214 if Out_Present
(Formal
) then
7216 -- An IN OUT generic actual must be a name. The instantiation is a
7217 -- renaming declaration. The actual is the name being renamed. We
7218 -- use the actual directly, rather than a copy, because it is not
7219 -- used further in the list of actuals, and because a copy or a use
7220 -- of relocate_node is incorrect if the instance is nested within a
7221 -- generic. In order to simplify ASIS searches, the Generic_Parent
7222 -- field links the declaration to the generic association.
7227 Instantiation_Node
, Formal_Id
);
7229 ("\in instantiation of & declared#",
7231 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7232 Abandon_Instantiation
(Instantiation_Node
);
7236 Make_Object_Renaming_Declaration
(Loc
,
7237 Defining_Identifier
=> New_Copy
(Formal_Id
),
7238 Subtype_Mark
=> New_Copy_Tree
(Type_Id
),
7241 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7243 -- The analysis of the actual may produce insert_action nodes, so
7244 -- the declaration must have a context in which to attach them.
7246 Append
(Decl_Node
, List
);
7249 -- Return if the analysis of the actual reported some error
7251 if Etype
(Actual
) = Any_Type
then
7255 -- This check is performed here because Analyze_Object_Renaming
7256 -- will not check it when Comes_From_Source is False. Note
7257 -- though that the check for the actual being the name of an
7258 -- object will be performed in Analyze_Object_Renaming.
7260 if Is_Object_Reference
(Actual
)
7261 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
7264 ("illegal discriminant-dependent component for in out parameter",
7268 -- The actual has to be resolved in order to check that it is
7269 -- a variable (due to cases such as F(1), where F returns
7270 -- access to an array, and for overloaded prefixes).
7273 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
7275 if Is_Private_Type
(Ftyp
)
7276 and then not Is_Private_Type
(Etype
(Actual
))
7277 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
7278 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
7280 -- If the actual has the type of the full view of the formal,
7281 -- or else a non-private subtype of the formal, then
7282 -- the visibility of the formal type has changed. Add to the
7283 -- actuals a subtype declaration that will force the exchange
7284 -- of views in the body of the instance as well.
7287 Make_Subtype_Declaration
(Loc
,
7288 Defining_Identifier
=>
7289 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
7290 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
7292 Prepend
(Subt_Decl
, List
);
7294 Prepend_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
7295 Exchange_Declarations
(Ftyp
);
7298 Resolve
(Actual
, Ftyp
);
7300 if not Is_Variable
(Actual
) or else Paren_Count
(Actual
) > 0 then
7302 ("actual for& must be a variable", Actual
, Formal_Id
);
7304 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
7306 "type of actual does not match type of&", Actual
, Formal_Id
);
7310 Note_Possible_Modification
(Actual
);
7312 -- Check for instantiation of atomic/volatile actual for
7313 -- non-atomic/volatile formal (RM C.6 (12)).
7315 if Is_Atomic_Object
(Actual
)
7316 and then not Is_Atomic
(Orig_Ftyp
)
7319 ("cannot instantiate non-atomic formal object " &
7320 "with atomic actual", Actual
);
7322 elsif Is_Volatile_Object
(Actual
)
7323 and then not Is_Volatile
(Orig_Ftyp
)
7326 ("cannot instantiate non-volatile formal object " &
7327 "with volatile actual", Actual
);
7333 -- The instantiation of a generic formal in-parameter
7334 -- is a constant declaration. The actual is the expression for
7335 -- that declaration.
7337 if Present
(Actual
) then
7339 Decl_Node
:= Make_Object_Declaration
(Loc
,
7340 Defining_Identifier
=> New_Copy
(Formal_Id
),
7341 Constant_Present
=> True,
7342 Object_Definition
=> New_Copy_Tree
(Type_Id
),
7343 Expression
=> Actual
);
7345 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7347 -- A generic formal object of a tagged type is defined
7348 -- to be aliased so the new constant must also be treated
7352 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7354 Set_Aliased_Present
(Decl_Node
);
7357 Append
(Decl_Node
, List
);
7359 -- No need to repeat (pre-)analysis of some expression nodes
7360 -- already handled in Pre_Analyze_Actuals.
7362 if Nkind
(Actual
) /= N_Allocator
then
7365 -- Return if the analysis of the actual reported some error
7367 if Etype
(Actual
) = Any_Type
then
7373 Typ
: constant Entity_Id
:=
7375 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
7378 Freeze_Before
(Instantiation_Node
, Typ
);
7380 -- If the actual is an aggregate, perform name resolution on
7381 -- its components (the analysis of an aggregate does not do
7382 -- it) to capture local names that may be hidden if the
7383 -- generic is a child unit.
7385 if Nkind
(Actual
) = N_Aggregate
then
7386 Pre_Analyze_And_Resolve
(Actual
, Typ
);
7390 elsif Present
(Expression
(Formal
)) then
7392 -- Use default to construct declaration
7395 Make_Object_Declaration
(Sloc
(Formal
),
7396 Defining_Identifier
=> New_Copy
(Formal_Id
),
7397 Constant_Present
=> True,
7398 Object_Definition
=> New_Copy
(Type_Id
),
7399 Expression
=> New_Copy_Tree
(Expression
(Formal
)));
7401 Append
(Decl_Node
, List
);
7402 Set_Analyzed
(Expression
(Decl_Node
), False);
7407 Instantiation_Node
, Formal_Id
);
7408 Error_Msg_NE
("\in instantiation of & declared#",
7410 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7413 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7415 -- Create dummy constant declaration so that instance can
7416 -- be analyzed, to minimize cascaded visibility errors.
7419 Make_Object_Declaration
(Loc
,
7420 Defining_Identifier
=> New_Copy
(Formal_Id
),
7421 Constant_Present
=> True,
7422 Object_Definition
=> New_Copy
(Type_Id
),
7424 Make_Attribute_Reference
(Sloc
(Formal_Id
),
7425 Attribute_Name
=> Name_First
,
7426 Prefix
=> New_Copy
(Type_Id
)));
7428 Append
(Decl_Node
, List
);
7431 Abandon_Instantiation
(Instantiation_Node
);
7438 end Instantiate_Object
;
7440 ------------------------------
7441 -- Instantiate_Package_Body --
7442 ------------------------------
7444 procedure Instantiate_Package_Body
7445 (Body_Info
: Pending_Body_Info
;
7446 Inlined_Body
: Boolean := False)
7448 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7449 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7450 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7452 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7453 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7454 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7455 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
7456 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
7458 Act_Body_Name
: Node_Id
;
7460 Gen_Body_Id
: Node_Id
;
7462 Act_Body_Id
: Entity_Id
;
7464 Parent_Installed
: Boolean := False;
7465 Save_Style_Check
: constant Boolean := Style_Check
;
7468 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7470 -- The instance body may already have been processed, as the parent
7471 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7473 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
7477 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7479 if No
(Gen_Body_Id
) then
7480 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7481 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7484 -- Establish global variable for sloc adjustment and for error
7487 Instantiation_Node
:= Inst_Node
;
7489 if Present
(Gen_Body_Id
) then
7490 Save_Env
(Gen_Unit
, Act_Decl_Id
);
7491 Style_Check
:= False;
7492 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7494 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7496 Create_Instantiation_Source
7497 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
7501 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7503 -- Build new name (possibly qualified) for body declaration
7505 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
7507 -- Some attributes of the spec entity are not inherited by the
7510 Set_Handler_Records
(Act_Body_Id
, No_List
);
7512 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7513 N_Defining_Program_Unit_Name
7516 Make_Defining_Program_Unit_Name
(Loc
,
7517 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
7518 Defining_Identifier
=> Act_Body_Id
);
7520 Act_Body_Name
:= Act_Body_Id
;
7523 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
7525 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
7526 Check_Generic_Actuals
(Act_Decl_Id
, False);
7528 -- If it is a child unit, make the parent instance (which is an
7529 -- instance of the parent of the generic) visible. The parent
7530 -- instance is the prefix of the name of the generic unit.
7532 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7533 and then Nkind
(Gen_Id
) = N_Expanded_Name
7535 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7536 Parent_Installed
:= True;
7538 elsif Is_Child_Unit
(Gen_Unit
) then
7539 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7540 Parent_Installed
:= True;
7543 -- If the instantiation is a library unit, and this is the main
7544 -- unit, then build the resulting compilation unit nodes for the
7545 -- instance. If this is a compilation unit but it is not the main
7546 -- unit, then it is the body of a unit in the context, that is being
7547 -- compiled because it is encloses some inlined unit or another
7548 -- generic unit being instantiated. In that case, this body is not
7549 -- part of the current compilation, and is not attached to the tree,
7550 -- but its parent must be set for analysis.
7552 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7554 -- Replace instance node with body of instance, and create
7555 -- new node for corresponding instance declaration.
7557 Build_Instance_Compilation_Unit_Nodes
7558 (Inst_Node
, Act_Body
, Act_Decl
);
7559 Analyze
(Inst_Node
);
7561 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7563 -- If the instance is a child unit itself, then set the
7564 -- scope of the expanded body to be the parent of the
7565 -- instantiation (ensuring that the fully qualified name
7566 -- will be generated for the elaboration subprogram).
7568 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7569 N_Defining_Program_Unit_Name
7572 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
7576 -- Case where instantiation is not a library unit
7579 -- If this is an early instantiation, i.e. appears textually
7580 -- before the corresponding body and must be elaborated first,
7581 -- indicate that the body instance is to be delayed.
7583 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
7585 -- Now analyze the body. We turn off all checks if this is
7586 -- an internal unit, since there is no reason to have checks
7587 -- on for any predefined run-time library code. All such
7588 -- code is designed to be compiled with checks off.
7590 -- Note that we do NOT apply this criterion to children of
7591 -- GNAT (or on VMS, children of DEC). The latter units must
7592 -- suppress checks explicitly if this is needed.
7594 if Is_Predefined_File_Name
7595 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
7597 Analyze
(Act_Body
, Suppress
=> All_Checks
);
7603 if not Generic_Separately_Compiled
(Gen_Unit
) then
7604 Inherit_Context
(Gen_Body
, Inst_Node
);
7607 -- Remove the parent instances if they have been placed on the
7608 -- scope stack to compile the body.
7610 if Parent_Installed
then
7611 Remove_Parent
(In_Body
=> True);
7614 Restore_Private_Views
(Act_Decl_Id
);
7616 -- Remove the current unit from visibility if this is an instance
7617 -- that is not elaborated on the fly for inlining purposes.
7619 if not Inlined_Body
then
7620 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
7624 Style_Check
:= Save_Style_Check
;
7626 -- If we have no body, and the unit requires a body, then complain.
7627 -- This complaint is suppressed if we have detected other errors
7628 -- (since a common reason for missing the body is that it had errors).
7630 elsif Unit_Requires_Body
(Gen_Unit
) then
7631 if Serious_Errors_Detected
= 0 then
7633 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
7635 -- Don't attempt to perform any cleanup actions if some other
7636 -- error was aready detected, since this can cause blowups.
7642 -- Case of package that does not need a body
7645 -- If the instantiation of the declaration is a library unit,
7646 -- rewrite the original package instantiation as a package
7647 -- declaration in the compilation unit node.
7649 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7650 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
7651 Rewrite
(Inst_Node
, Act_Decl
);
7653 -- Generate elaboration entity, in case spec has elaboration
7654 -- code. This cannot be done when the instance is analyzed,
7655 -- because it is not known yet whether the body exists.
7657 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
7658 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
7660 -- If the instantiation is not a library unit, then append the
7661 -- declaration to the list of implicitly generated entities.
7662 -- unless it is already a list member which means that it was
7663 -- already processed
7665 elsif not Is_List_Member
(Act_Decl
) then
7666 Mark_Rewrite_Insertion
(Act_Decl
);
7667 Insert_Before
(Inst_Node
, Act_Decl
);
7671 Expander_Mode_Restore
;
7672 end Instantiate_Package_Body
;
7674 ---------------------------------
7675 -- Instantiate_Subprogram_Body --
7676 ---------------------------------
7678 procedure Instantiate_Subprogram_Body
7679 (Body_Info
: Pending_Body_Info
)
7681 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7682 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7683 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7684 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7685 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7686 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7687 Anon_Id
: constant Entity_Id
:=
7688 Defining_Unit_Name
(Specification
(Act_Decl
));
7689 Pack_Id
: constant Entity_Id
:=
7690 Defining_Unit_Name
(Parent
(Act_Decl
));
7693 Gen_Body_Id
: Node_Id
;
7695 Act_Body_Id
: Entity_Id
;
7696 Pack_Body
: Node_Id
;
7697 Prev_Formal
: Entity_Id
;
7699 Unit_Renaming
: Node_Id
;
7701 Parent_Installed
: Boolean := False;
7702 Save_Style_Check
: constant Boolean := Style_Check
;
7705 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7707 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7709 if No
(Gen_Body_Id
) then
7710 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7711 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7714 Instantiation_Node
:= Inst_Node
;
7716 if Present
(Gen_Body_Id
) then
7717 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7719 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
7721 -- Either body is not present, or context is non-expanding, as
7722 -- when compiling a subunit. Mark the instance as completed, and
7723 -- diagnose a missing body when needed.
7726 and then Operating_Mode
= Generate_Code
7729 ("missing proper body for instantiation", Gen_Body
);
7732 Set_Has_Completion
(Anon_Id
);
7736 Save_Env
(Gen_Unit
, Anon_Id
);
7737 Style_Check
:= False;
7738 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7739 Create_Instantiation_Source
7747 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7748 Act_Body_Id
:= Defining_Entity
(Act_Body
);
7749 Set_Chars
(Act_Body_Id
, Chars
(Anon_Id
));
7750 Set_Sloc
(Act_Body_Id
, Sloc
(Defining_Entity
(Inst_Node
)));
7751 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
7752 Set_Has_Completion
(Anon_Id
);
7753 Check_Generic_Actuals
(Pack_Id
, False);
7755 -- If it is a child unit, make the parent instance (which is an
7756 -- instance of the parent of the generic) visible. The parent
7757 -- instance is the prefix of the name of the generic unit.
7759 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7760 and then Nkind
(Gen_Id
) = N_Expanded_Name
7762 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7763 Parent_Installed
:= True;
7765 elsif Is_Child_Unit
(Gen_Unit
) then
7766 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7767 Parent_Installed
:= True;
7770 -- Inside its body, a reference to the generic unit is a reference
7771 -- to the instance. The corresponding renaming is the first
7772 -- declaration in the body.
7775 Make_Subprogram_Renaming_Declaration
(Loc
,
7778 Specification
(Original_Node
(Gen_Body
)),
7780 Instantiating
=> True),
7781 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7783 -- If there is a formal subprogram with the same name as the
7784 -- unit itself, do not add this renaming declaration. This is
7785 -- a temporary fix for one ACVC test. ???
7787 Prev_Formal
:= First_Entity
(Pack_Id
);
7788 while Present
(Prev_Formal
) loop
7789 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
7790 and then Is_Overloadable
(Prev_Formal
)
7795 Next_Entity
(Prev_Formal
);
7798 if Present
(Prev_Formal
) then
7799 Decls
:= New_List
(Act_Body
);
7801 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
7804 -- The subprogram body is placed in the body of a dummy package
7805 -- body, whose spec contains the subprogram declaration as well
7806 -- as the renaming declarations for the generic parameters.
7808 Pack_Body
:= Make_Package_Body
(Loc
,
7809 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7810 Declarations
=> Decls
);
7812 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7814 -- If the instantiation is a library unit, then build resulting
7815 -- compilation unit nodes for the instance. The declaration of
7816 -- the enclosing package is the grandparent of the subprogram
7817 -- declaration. First replace the instantiation node as the unit
7818 -- of the corresponding compilation.
7820 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7821 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7822 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
7823 Build_Instance_Compilation_Unit_Nodes
7824 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
7825 Analyze
(Inst_Node
);
7827 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
7828 Analyze
(Pack_Body
);
7832 Insert_Before
(Inst_Node
, Pack_Body
);
7833 Mark_Rewrite_Insertion
(Pack_Body
);
7834 Analyze
(Pack_Body
);
7836 if Expander_Active
then
7837 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
7841 if not Generic_Separately_Compiled
(Gen_Unit
) then
7842 Inherit_Context
(Gen_Body
, Inst_Node
);
7845 Restore_Private_Views
(Pack_Id
, False);
7847 if Parent_Installed
then
7848 Remove_Parent
(In_Body
=> True);
7852 Style_Check
:= Save_Style_Check
;
7854 -- Body not found. Error was emitted already. If there were no
7855 -- previous errors, this may be an instance whose scope is a premature
7856 -- instance. In that case we must insure that the (legal) program does
7857 -- raise program error if executed. We generate a subprogram body for
7858 -- this purpose. See DEC ac30vso.
7860 elsif Serious_Errors_Detected
= 0
7861 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
7863 if Ekind
(Anon_Id
) = E_Procedure
then
7865 Make_Subprogram_Body
(Loc
,
7867 Make_Procedure_Specification
(Loc
,
7868 Defining_Unit_Name
=>
7869 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
7870 Parameter_Specifications
=>
7872 (Parameter_Specifications
(Parent
(Anon_Id
)))),
7874 Declarations
=> Empty_List
,
7875 Handled_Statement_Sequence
=>
7876 Make_Handled_Sequence_Of_Statements
(Loc
,
7879 Make_Raise_Program_Error
(Loc
,
7881 PE_Access_Before_Elaboration
))));
7885 Make_Raise_Program_Error
(Loc
,
7886 Reason
=> PE_Access_Before_Elaboration
);
7888 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
7889 Set_Analyzed
(Ret_Expr
);
7892 Make_Subprogram_Body
(Loc
,
7894 Make_Function_Specification
(Loc
,
7895 Defining_Unit_Name
=>
7896 Make_Defining_Identifier
(Loc
, Chars
(Anon_Id
)),
7897 Parameter_Specifications
=>
7899 (Parameter_Specifications
(Parent
(Anon_Id
))),
7900 Result_Definition
=>
7901 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
7903 Declarations
=> Empty_List
,
7904 Handled_Statement_Sequence
=>
7905 Make_Handled_Sequence_Of_Statements
(Loc
,
7907 New_List
(Make_Return_Statement
(Loc
, Ret_Expr
))));
7910 Pack_Body
:= Make_Package_Body
(Loc
,
7911 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7912 Declarations
=> New_List
(Act_Body
));
7914 Insert_After
(Inst_Node
, Pack_Body
);
7915 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7916 Analyze
(Pack_Body
);
7919 Expander_Mode_Restore
;
7920 end Instantiate_Subprogram_Body
;
7922 ----------------------
7923 -- Instantiate_Type --
7924 ----------------------
7926 function Instantiate_Type
7929 Analyzed_Formal
: Node_Id
;
7930 Actual_Decls
: List_Id
) return Node_Id
7932 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7933 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7934 A_Gen_T
: constant Entity_Id
:= Defining_Identifier
(Analyzed_Formal
);
7935 Ancestor
: Entity_Id
:= Empty
;
7936 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
7938 Decl_Node
: Node_Id
;
7940 procedure Validate_Array_Type_Instance
;
7941 procedure Validate_Access_Subprogram_Instance
;
7942 procedure Validate_Access_Type_Instance
;
7943 procedure Validate_Derived_Type_Instance
;
7944 procedure Validate_Private_Type_Instance
;
7945 -- These procedures perform validation tests for the named case
7947 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
7948 -- Check that base types are the same and that the subtypes match
7949 -- statically. Used in several of the above.
7951 --------------------
7952 -- Subtypes_Match --
7953 --------------------
7955 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
7956 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
7959 return (Base_Type
(T
) = Base_Type
(Act_T
)
7960 -- why is the and then commented out here???
7961 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7962 and then Subtypes_Statically_Match
(T
, Act_T
))
7964 or else (Is_Class_Wide_Type
(Gen_T
)
7965 and then Is_Class_Wide_Type
(Act_T
)
7968 Get_Instance_Of
(Root_Type
(Gen_T
)),
7969 Root_Type
(Act_T
)));
7972 -----------------------------------------
7973 -- Validate_Access_Subprogram_Instance --
7974 -----------------------------------------
7976 procedure Validate_Access_Subprogram_Instance
is
7978 if not Is_Access_Type
(Act_T
)
7979 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
7982 ("expect access type in instantiation of &", Actual
, Gen_T
);
7983 Abandon_Instantiation
(Actual
);
7986 Check_Mode_Conformant
7987 (Designated_Type
(Act_T
),
7988 Designated_Type
(A_Gen_T
),
7992 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
7993 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
7995 ("protected access type not allowed for formal &",
7999 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
8001 ("expect protected access type for formal &",
8004 end Validate_Access_Subprogram_Instance
;
8006 -----------------------------------
8007 -- Validate_Access_Type_Instance --
8008 -----------------------------------
8010 procedure Validate_Access_Type_Instance
is
8011 Desig_Type
: constant Entity_Id
:=
8013 (Designated_Type
(A_Gen_T
), Scope
(A_Gen_T
));
8016 if not Is_Access_Type
(Act_T
) then
8018 ("expect access type in instantiation of &", Actual
, Gen_T
);
8019 Abandon_Instantiation
(Actual
);
8022 if Is_Access_Constant
(A_Gen_T
) then
8023 if not Is_Access_Constant
(Act_T
) then
8025 ("actual type must be access-to-constant type", Actual
);
8026 Abandon_Instantiation
(Actual
);
8029 if Is_Access_Constant
(Act_T
) then
8031 ("actual type must be access-to-variable type", Actual
);
8032 Abandon_Instantiation
(Actual
);
8034 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
8035 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
8037 Error_Msg_N
("actual must be general access type!", Actual
);
8038 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
8039 Abandon_Instantiation
(Actual
);
8043 -- The designated subtypes, that is to say the subtypes introduced
8044 -- by an access type declaration (and not by a subtype declaration)
8047 if not Subtypes_Match
8048 (Desig_Type
, Designated_Type
(Base_Type
(Act_T
)))
8051 ("designated type of actual does not match that of formal &",
8053 Abandon_Instantiation
(Actual
);
8055 elsif Is_Access_Type
(Designated_Type
(Act_T
))
8056 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
8058 Is_Constrained
(Designated_Type
(Desig_Type
))
8061 ("designated type of actual does not match that of formal &",
8063 Abandon_Instantiation
(Actual
);
8065 end Validate_Access_Type_Instance
;
8067 ----------------------------------
8068 -- Validate_Array_Type_Instance --
8069 ----------------------------------
8071 procedure Validate_Array_Type_Instance
is
8076 function Formal_Dimensions
return Int
;
8077 -- Count number of dimensions in array type formal
8079 -----------------------
8080 -- Formal_Dimensions --
8081 -----------------------
8083 function Formal_Dimensions
return Int
is
8088 if Nkind
(Def
) = N_Constrained_Array_Definition
then
8089 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
8091 Index
:= First
(Subtype_Marks
(Def
));
8094 while Present
(Index
) loop
8100 end Formal_Dimensions
;
8102 -- Start of processing for Validate_Array_Type_Instance
8105 if not Is_Array_Type
(Act_T
) then
8107 ("expect array type in instantiation of &", Actual
, Gen_T
);
8108 Abandon_Instantiation
(Actual
);
8110 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
8111 if not (Is_Constrained
(Act_T
)) then
8113 ("expect constrained array in instantiation of &",
8115 Abandon_Instantiation
(Actual
);
8119 if Is_Constrained
(Act_T
) then
8121 ("expect unconstrained array in instantiation of &",
8123 Abandon_Instantiation
(Actual
);
8127 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
8129 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
8130 Abandon_Instantiation
(Actual
);
8133 I1
:= First_Index
(A_Gen_T
);
8134 I2
:= First_Index
(Act_T
);
8135 for J
in 1 .. Formal_Dimensions
loop
8137 -- If the indices of the actual were given by a subtype_mark,
8138 -- the index was transformed into a range attribute. Retrieve
8139 -- the original type mark for checking.
8141 if Is_Entity_Name
(Original_Node
(I2
)) then
8142 T2
:= Entity
(Original_Node
(I2
));
8147 if not Subtypes_Match
8148 (Find_Actual_Type
(Etype
(I1
), Scope
(A_Gen_T
)), T2
)
8151 ("index types of actual do not match those of formal &",
8153 Abandon_Instantiation
(Actual
);
8160 if not Subtypes_Match
(
8161 Find_Actual_Type
(Component_Type
(A_Gen_T
), Scope
(A_Gen_T
)),
8162 Component_Type
(Act_T
))
8165 ("component subtype of actual does not match that of formal &",
8167 Abandon_Instantiation
(Actual
);
8170 if Has_Aliased_Components
(A_Gen_T
)
8171 and then not Has_Aliased_Components
(Act_T
)
8174 ("actual must have aliased components to match formal type &",
8178 end Validate_Array_Type_Instance
;
8180 ------------------------------------
8181 -- Validate_Derived_Type_Instance --
8182 ------------------------------------
8184 procedure Validate_Derived_Type_Instance
is
8185 Actual_Discr
: Entity_Id
;
8186 Ancestor_Discr
: Entity_Id
;
8189 -- If the parent type in the generic declaration is itself
8190 -- a previous formal type, then it is local to the generic
8191 -- and absent from the analyzed generic definition. In that
8192 -- case the ancestor is the instance of the formal (which must
8193 -- have been instantiated previously), unless the ancestor is
8194 -- itself a formal derived type. In this latter case (which is the
8195 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8196 -- formals is the ancestor of its parent. Otherwise, the analyzed
8197 -- generic carries the parent type. If the parent type is defined
8198 -- in a previous formal package, then the scope of that formal
8199 -- package is that of the generic type itself, and it has already
8200 -- been mapped into the corresponding type in the actual package.
8202 -- Common case: parent type defined outside of the generic
8204 if Is_Entity_Name
(Subtype_Mark
(Def
))
8205 and then Present
(Entity
(Subtype_Mark
(Def
)))
8207 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
8209 -- Check whether parent is defined in a previous formal package
8212 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
8215 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
8217 -- The type may be a local derivation, or a type extension of
8218 -- a previous formal, or of a formal of a parent package.
8220 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
8222 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
8224 -- Check whether the parent is another derived formal type
8225 -- in the same generic unit.
8227 if Etype
(A_Gen_T
) /= A_Gen_T
8228 and then Is_Generic_Type
(Etype
(A_Gen_T
))
8229 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
8230 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
8232 -- Locate ancestor of parent from the subtype declaration
8233 -- created for the actual.
8239 Decl
:= First
(Actual_Decls
);
8240 while Present
(Decl
) loop
8241 if Nkind
(Decl
) = N_Subtype_Declaration
8242 and then Chars
(Defining_Identifier
(Decl
)) =
8243 Chars
(Etype
(A_Gen_T
))
8245 Ancestor
:= Generic_Parent_Type
(Decl
);
8253 pragma Assert
(Present
(Ancestor
));
8257 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
8261 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
8264 -- Ada 2005 (AI-251)
8266 if Ada_Version
>= Ada_05
8267 and then Is_Interface
(Ancestor
)
8269 if not Interface_Present_In_Ancestor
(Act_T
, Ancestor
) then
8271 ("(Ada 2005) expected type implementing & in instantiation",
8275 elsif not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
8277 ("expect type derived from & in instantiation",
8278 Actual
, First_Subtype
(Ancestor
));
8279 Abandon_Instantiation
(Actual
);
8282 -- Perform atomic/volatile checks (RM C.6(12))
8284 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
8286 ("cannot have atomic actual type for non-atomic formal type",
8289 elsif Is_Volatile
(Act_T
)
8290 and then not Is_Volatile
(Ancestor
)
8291 and then Is_By_Reference_Type
(Ancestor
)
8294 ("cannot have volatile actual type for non-volatile formal type",
8298 -- It should not be necessary to check for unknown discriminants
8299 -- on Formal, but for some reason Has_Unknown_Discriminants is
8300 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8301 -- returns False. This needs fixing. ???
8303 if not Is_Indefinite_Subtype
(A_Gen_T
)
8304 and then not Unknown_Discriminants_Present
(Formal
)
8305 and then Is_Indefinite_Subtype
(Act_T
)
8308 ("actual subtype must be constrained", Actual
);
8309 Abandon_Instantiation
(Actual
);
8312 if not Unknown_Discriminants_Present
(Formal
) then
8313 if Is_Constrained
(Ancestor
) then
8314 if not Is_Constrained
(Act_T
) then
8316 ("actual subtype must be constrained", Actual
);
8317 Abandon_Instantiation
(Actual
);
8320 -- Ancestor is unconstrained
8322 elsif Is_Constrained
(Act_T
) then
8323 if Ekind
(Ancestor
) = E_Access_Type
8324 or else Is_Composite_Type
(Ancestor
)
8327 ("actual subtype must be unconstrained", Actual
);
8328 Abandon_Instantiation
(Actual
);
8331 -- A class-wide type is only allowed if the formal has
8332 -- unknown discriminants.
8334 elsif Is_Class_Wide_Type
(Act_T
)
8335 and then not Has_Unknown_Discriminants
(Ancestor
)
8338 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
8339 Abandon_Instantiation
(Actual
);
8341 -- Otherwise, the formal and actual shall have the same
8342 -- number of discriminants and each discriminant of the
8343 -- actual must correspond to a discriminant of the formal.
8345 elsif Has_Discriminants
(Act_T
)
8346 and then not Has_Unknown_Discriminants
(Act_T
)
8347 and then Has_Discriminants
(Ancestor
)
8349 Actual_Discr
:= First_Discriminant
(Act_T
);
8350 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
8351 while Present
(Actual_Discr
)
8352 and then Present
(Ancestor_Discr
)
8354 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
8355 not Present
(Corresponding_Discriminant
(Actual_Discr
))
8358 ("discriminant & does not correspond " &
8359 "to ancestor discriminant", Actual
, Actual_Discr
);
8360 Abandon_Instantiation
(Actual
);
8363 Next_Discriminant
(Actual_Discr
);
8364 Next_Discriminant
(Ancestor_Discr
);
8367 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
8369 ("actual for & must have same number of discriminants",
8371 Abandon_Instantiation
(Actual
);
8374 -- This case should be caught by the earlier check for
8375 -- for constrainedness, but the check here is added for
8378 elsif Has_Discriminants
(Act_T
)
8379 and then not Has_Unknown_Discriminants
(Act_T
)
8382 ("actual for & must not have discriminants", Actual
, Gen_T
);
8383 Abandon_Instantiation
(Actual
);
8385 elsif Has_Discriminants
(Ancestor
) then
8387 ("actual for & must have known discriminants", Actual
, Gen_T
);
8388 Abandon_Instantiation
(Actual
);
8391 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
8393 ("constraint on actual is incompatible with formal", Actual
);
8394 Abandon_Instantiation
(Actual
);
8397 end Validate_Derived_Type_Instance
;
8399 ------------------------------------
8400 -- Validate_Private_Type_Instance --
8401 ------------------------------------
8403 procedure Validate_Private_Type_Instance
is
8404 Formal_Discr
: Entity_Id
;
8405 Actual_Discr
: Entity_Id
;
8406 Formal_Subt
: Entity_Id
;
8409 if Is_Limited_Type
(Act_T
)
8410 and then not Is_Limited_Type
(A_Gen_T
)
8413 ("actual for non-limited & cannot be a limited type", Actual
,
8415 Explain_Limited_Type
(Act_T
, Actual
);
8416 Abandon_Instantiation
(Actual
);
8418 elsif Is_Indefinite_Subtype
(Act_T
)
8419 and then not Is_Indefinite_Subtype
(A_Gen_T
)
8420 and then Ada_Version
>= Ada_95
8423 ("actual for & must be a definite subtype", Actual
, Gen_T
);
8425 elsif not Is_Tagged_Type
(Act_T
)
8426 and then Is_Tagged_Type
(A_Gen_T
)
8429 ("actual for & must be a tagged type", Actual
, Gen_T
);
8431 elsif Has_Discriminants
(A_Gen_T
) then
8432 if not Has_Discriminants
(Act_T
) then
8434 ("actual for & must have discriminants", Actual
, Gen_T
);
8435 Abandon_Instantiation
(Actual
);
8437 elsif Is_Constrained
(Act_T
) then
8439 ("actual for & must be unconstrained", Actual
, Gen_T
);
8440 Abandon_Instantiation
(Actual
);
8443 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
8444 Actual_Discr
:= First_Discriminant
(Act_T
);
8445 while Formal_Discr
/= Empty
loop
8446 if Actual_Discr
= Empty
then
8448 ("discriminants on actual do not match formal",
8450 Abandon_Instantiation
(Actual
);
8453 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
8455 -- Access discriminants match if designated types do
8457 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
8458 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
8459 E_Anonymous_Access_Type
8462 (Designated_Type
(Base_Type
(Formal_Subt
))) =
8463 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
8467 elsif Base_Type
(Formal_Subt
) /=
8468 Base_Type
(Etype
(Actual_Discr
))
8471 ("types of actual discriminants must match formal",
8473 Abandon_Instantiation
(Actual
);
8475 elsif not Subtypes_Statically_Match
8476 (Formal_Subt
, Etype
(Actual_Discr
))
8477 and then Ada_Version
>= Ada_95
8480 ("subtypes of actual discriminants must match formal",
8482 Abandon_Instantiation
(Actual
);
8485 Next_Discriminant
(Formal_Discr
);
8486 Next_Discriminant
(Actual_Discr
);
8489 if Actual_Discr
/= Empty
then
8491 ("discriminants on actual do not match formal",
8493 Abandon_Instantiation
(Actual
);
8500 end Validate_Private_Type_Instance
;
8502 -- Start of processing for Instantiate_Type
8505 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
8506 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
8509 elsif not Is_Entity_Name
(Actual
)
8510 or else not Is_Type
(Entity
(Actual
))
8513 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
8514 Abandon_Instantiation
(Actual
);
8517 Act_T
:= Entity
(Actual
);
8519 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8520 -- as a generic actual parameter if the corresponding formal type
8521 -- does not have a known_discriminant_part, or is a formal derived
8522 -- type that is an Unchecked_Union type.
8524 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
8525 if not Has_Discriminants
(A_Gen_T
)
8527 (Is_Derived_Type
(A_Gen_T
)
8529 Is_Unchecked_Union
(A_Gen_T
))
8533 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
8534 " discriminated formal type", Act_T
);
8539 -- Deal with fixed/floating restrictions
8541 if Is_Floating_Point_Type
(Act_T
) then
8542 Check_Restriction
(No_Floating_Point
, Actual
);
8543 elsif Is_Fixed_Point_Type
(Act_T
) then
8544 Check_Restriction
(No_Fixed_Point
, Actual
);
8547 -- Deal with error of using incomplete type as generic actual
8549 if Ekind
(Act_T
) = E_Incomplete_Type
then
8550 if No
(Underlying_Type
(Act_T
)) then
8551 Error_Msg_N
("premature use of incomplete type", Actual
);
8552 Abandon_Instantiation
(Actual
);
8554 Act_T
:= Full_View
(Act_T
);
8555 Set_Entity
(Actual
, Act_T
);
8557 if Has_Private_Component
(Act_T
) then
8559 ("premature use of type with private component", Actual
);
8563 -- Deal with error of premature use of private type as generic actual
8565 elsif Is_Private_Type
(Act_T
)
8566 and then Is_Private_Type
(Base_Type
(Act_T
))
8567 and then not Is_Generic_Type
(Act_T
)
8568 and then not Is_Derived_Type
(Act_T
)
8569 and then No
(Full_View
(Root_Type
(Act_T
)))
8571 Error_Msg_N
("premature use of private type", Actual
);
8573 elsif Has_Private_Component
(Act_T
) then
8575 ("premature use of type with private component", Actual
);
8578 Set_Instance_Of
(A_Gen_T
, Act_T
);
8580 -- If the type is generic, the class-wide type may also be used
8582 if Is_Tagged_Type
(A_Gen_T
)
8583 and then Is_Tagged_Type
(Act_T
)
8584 and then not Is_Class_Wide_Type
(A_Gen_T
)
8586 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
8587 Class_Wide_Type
(Act_T
));
8590 if not Is_Abstract
(A_Gen_T
)
8591 and then Is_Abstract
(Act_T
)
8594 ("actual of non-abstract formal cannot be abstract", Actual
);
8597 if Is_Scalar_Type
(Gen_T
) then
8598 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
8603 when N_Formal_Private_Type_Definition
=>
8604 Validate_Private_Type_Instance
;
8606 when N_Formal_Derived_Type_Definition
=>
8607 Validate_Derived_Type_Instance
;
8609 when N_Formal_Discrete_Type_Definition
=>
8610 if not Is_Discrete_Type
(Act_T
) then
8612 ("expect discrete type in instantiation of&", Actual
, Gen_T
);
8613 Abandon_Instantiation
(Actual
);
8616 when N_Formal_Signed_Integer_Type_Definition
=>
8617 if not Is_Signed_Integer_Type
(Act_T
) then
8619 ("expect signed integer type in instantiation of&",
8621 Abandon_Instantiation
(Actual
);
8624 when N_Formal_Modular_Type_Definition
=>
8625 if not Is_Modular_Integer_Type
(Act_T
) then
8627 ("expect modular type in instantiation of &", Actual
, Gen_T
);
8628 Abandon_Instantiation
(Actual
);
8631 when N_Formal_Floating_Point_Definition
=>
8632 if not Is_Floating_Point_Type
(Act_T
) then
8634 ("expect float type in instantiation of &", Actual
, Gen_T
);
8635 Abandon_Instantiation
(Actual
);
8638 when N_Formal_Ordinary_Fixed_Point_Definition
=>
8639 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
8641 ("expect ordinary fixed point type in instantiation of &",
8643 Abandon_Instantiation
(Actual
);
8646 when N_Formal_Decimal_Fixed_Point_Definition
=>
8647 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
8649 ("expect decimal type in instantiation of &",
8651 Abandon_Instantiation
(Actual
);
8654 when N_Array_Type_Definition
=>
8655 Validate_Array_Type_Instance
;
8657 when N_Access_To_Object_Definition
=>
8658 Validate_Access_Type_Instance
;
8660 when N_Access_Function_Definition |
8661 N_Access_Procedure_Definition
=>
8662 Validate_Access_Subprogram_Instance
;
8665 raise Program_Error
;
8670 Make_Subtype_Declaration
(Loc
,
8671 Defining_Identifier
=> New_Copy
(Gen_T
),
8672 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
8674 if Is_Private_Type
(Act_T
) then
8675 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8677 elsif Is_Access_Type
(Act_T
)
8678 and then Is_Private_Type
(Designated_Type
(Act_T
))
8680 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8683 -- Flag actual derived types so their elaboration produces the
8684 -- appropriate renamings for the primitive operations of the ancestor.
8685 -- Flag actual for formal private types as well, to determine whether
8686 -- operations in the private part may override inherited operations.
8688 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
8689 or else Nkind
(Def
) = N_Formal_Private_Type_Definition
8691 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
8695 end Instantiate_Type
;
8697 ---------------------
8698 -- Is_In_Main_Unit --
8699 ---------------------
8701 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
8702 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
8703 Current_Unit
: Node_Id
;
8706 if Unum
= Main_Unit
then
8709 -- If the current unit is a subunit then it is either the main unit
8710 -- or is being compiled as part of the main unit.
8712 elsif Nkind
(N
) = N_Compilation_Unit
then
8713 return Nkind
(Unit
(N
)) = N_Subunit
;
8716 Current_Unit
:= Parent
(N
);
8717 while Present
(Current_Unit
)
8718 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8720 Current_Unit
:= Parent
(Current_Unit
);
8723 -- The instantiation node is in the main unit, or else the current
8724 -- node (perhaps as the result of nested instantiations) is in the
8725 -- main unit, or in the declaration of the main unit, which in this
8726 -- last case must be a body.
8728 return Unum
= Main_Unit
8729 or else Current_Unit
= Cunit
(Main_Unit
)
8730 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
8731 or else (Present
(Library_Unit
(Current_Unit
))
8732 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
8733 end Is_In_Main_Unit
;
8735 ----------------------------
8736 -- Load_Parent_Of_Generic --
8737 ----------------------------
8739 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
) is
8740 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
8741 Save_Style_Check
: constant Boolean := Style_Check
;
8742 True_Parent
: Node_Id
;
8743 Inst_Node
: Node_Id
;
8747 if not In_Same_Source_Unit
(N
, Spec
)
8748 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
8749 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
8750 and then not Is_In_Main_Unit
(Spec
))
8752 -- Find body of parent of spec, and analyze it. A special case
8753 -- arises when the parent is an instantiation, that is to say when
8754 -- we are currently instantiating a nested generic. In that case,
8755 -- there is no separate file for the body of the enclosing instance.
8756 -- Instead, the enclosing body must be instantiated as if it were
8757 -- a pending instantiation, in order to produce the body for the
8758 -- nested generic we require now. Note that in that case the
8759 -- generic may be defined in a package body, the instance defined
8760 -- in the same package body, and the original enclosing body may not
8761 -- be in the main unit.
8763 True_Parent
:= Parent
(Spec
);
8766 while Present
(True_Parent
)
8767 and then Nkind
(True_Parent
) /= N_Compilation_Unit
8769 if Nkind
(True_Parent
) = N_Package_Declaration
8771 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
8773 -- Parent is a compilation unit that is an instantiation.
8774 -- Instantiation node has been replaced with package decl.
8776 Inst_Node
:= Original_Node
(True_Parent
);
8779 elsif Nkind
(True_Parent
) = N_Package_Declaration
8780 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
8781 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
8783 -- Parent is an instantiation within another specification.
8784 -- Declaration for instance has been inserted before original
8785 -- instantiation node. A direct link would be preferable?
8787 Inst_Node
:= Next
(True_Parent
);
8789 while Present
(Inst_Node
)
8790 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
8795 -- If the instance appears within a generic, and the generic
8796 -- unit is defined within a formal package of the enclosing
8797 -- generic, there is no generic body available, and none
8798 -- needed. A more precise test should be used ???
8800 if No
(Inst_Node
) then
8806 True_Parent
:= Parent
(True_Parent
);
8810 -- Case where we are currently instantiating a nested generic
8812 if Present
(Inst_Node
) then
8813 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
8815 -- Instantiation node and declaration of instantiated package
8816 -- were exchanged when only the declaration was needed.
8817 -- Restore instantiation node before proceeding with body.
8819 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
8822 -- Now complete instantiation of enclosing body, if it appears
8823 -- in some other unit. If it appears in the current unit, the
8824 -- body will have been instantiated already.
8826 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8828 -- We need to determine the expander mode to instantiate
8829 -- the enclosing body. Because the generic body we need
8830 -- may use global entities declared in the enclosing package
8831 -- (including aggregates) it is in general necessary to
8832 -- compile this body with expansion enabled. The exception
8833 -- is if we are within a generic package, in which case
8834 -- the usual generic rule applies.
8837 Exp_Status
: Boolean := True;
8841 -- Loop through scopes looking for generic package
8843 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
8844 while Present
(Scop
)
8845 and then Scop
/= Standard_Standard
8847 if Ekind
(Scop
) = E_Generic_Package
then
8848 Exp_Status
:= False;
8852 Scop
:= Scope
(Scop
);
8855 Instantiate_Package_Body
8856 (Pending_Body_Info
'(
8857 Inst_Node, True_Parent, Exp_Status,
8858 Get_Code_Unit (Sloc (Inst_Node))));
8862 -- Case where we are not instantiating a nested generic
8865 Opt.Style_Check := False;
8866 Expander_Mode_Save_And_Set (True);
8867 Load_Needed_Body (Comp_Unit, OK);
8868 Opt.Style_Check := Save_Style_Check;
8869 Expander_Mode_Restore;
8872 and then Unit_Requires_Body (Defining_Entity (Spec))
8875 Bname : constant Unit_Name_Type :=
8876 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8879 Error_Msg_Unit_1 := Bname;
8880 Error_Msg_N ("this instantiation requires$!", N);
8882 Get_File_Name (Bname, Subunit => False);
8883 Error_Msg_N ("\but file{ was not found!", N);
8884 raise Unrecoverable_Error;
8890 -- If loading the parent of the generic caused an instantiation
8891 -- circularity, we abandon compilation at this point, because
8892 -- otherwise in some cases we get into trouble with infinite
8893 -- recursions after this point.
8895 if Circularity_Detected then
8896 raise Unrecoverable_Error;
8898 end Load_Parent_Of_Generic;
8900 -----------------------
8901 -- Move_Freeze_Nodes --
8902 -----------------------
8904 procedure Move_Freeze_Nodes
8905 (Out_Of : Entity_Id;
8910 Next_Decl : Node_Id;
8911 Next_Node : Node_Id := After;
8914 function Is_Outer_Type (T : Entity_Id) return Boolean;
8915 -- Check whether entity is declared in a scope external to that
8916 -- of the generic unit.
8922 function Is_Outer_Type (T : Entity_Id) return Boolean is
8923 Scop : Entity_Id := Scope (T);
8926 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8930 while Scop /= Standard_Standard loop
8932 if Scop = Out_Of then
8935 Scop := Scope (Scop);
8943 -- Start of processing for Move_Freeze_Nodes
8950 -- First remove the freeze nodes that may appear before all other
8954 while Present (Decl)
8955 and then Nkind (Decl) = N_Freeze_Entity
8956 and then Is_Outer_Type (Entity (Decl))
8958 Decl := Remove_Head (L);
8959 Insert_After (Next_Node, Decl);
8960 Set_Analyzed (Decl, False);
8965 -- Next scan the list of declarations and remove each freeze node that
8966 -- appears ahead of the current node.
8968 while Present (Decl) loop
8969 while Present (Next (Decl))
8970 and then Nkind (Next (Decl)) = N_Freeze_Entity
8971 and then Is_Outer_Type (Entity (Next (Decl)))
8973 Next_Decl := Remove_Next (Decl);
8974 Insert_After (Next_Node, Next_Decl);
8975 Set_Analyzed (Next_Decl, False);
8976 Next_Node := Next_Decl;
8979 -- If the declaration is a nested package or concurrent type, then
8980 -- recurse. Nested generic packages will have been processed from the
8983 if Nkind (Decl) = N_Package_Declaration then
8984 Spec := Specification (Decl);
8986 elsif Nkind (Decl) = N_Task_Type_Declaration then
8987 Spec := Task_Definition (Decl);
8989 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8990 Spec := Protected_Definition (Decl);
8996 if Present (Spec) then
8997 Move_Freeze_Nodes (Out_Of, Next_Node,
8998 Visible_Declarations (Spec));
8999 Move_Freeze_Nodes (Out_Of, Next_Node,
9000 Private_Declarations (Spec));
9005 end Move_Freeze_Nodes;
9011 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
9013 return Generic_Renamings.Table (E).Next_In_HTable;
9016 ------------------------
9017 -- Preanalyze_Actuals --
9018 ------------------------
9020 procedure Pre_Analyze_Actuals (N : Node_Id) is
9023 Errs : constant Int := Serious_Errors_Detected;
9026 Assoc := First (Generic_Associations (N));
9028 while Present (Assoc) loop
9029 Act := Explicit_Generic_Actual_Parameter (Assoc);
9031 -- Within a nested instantiation, a defaulted actual is an
9032 -- empty association, so nothing to analyze. If the actual for
9033 -- a subprogram is an attribute, analyze prefix only, because
9034 -- actual is not a complete attribute reference.
9036 -- If actual is an allocator, analyze expression only. The full
9037 -- analysis can generate code, and if the instance is a compilation
9038 -- unit we have to wait until the package instance is installed to
9039 -- have a proper place to insert this code.
9041 -- String literals may be operators, but at this point we do not
9042 -- know whether the actual is a formal subprogram or a string.
9047 elsif Nkind (Act) = N_Attribute_Reference then
9048 Analyze (Prefix (Act));
9050 elsif Nkind (Act) = N_Explicit_Dereference then
9051 Analyze (Prefix (Act));
9053 elsif Nkind (Act) = N_Allocator then
9055 Expr : constant Node_Id := Expression (Act);
9058 if Nkind (Expr) = N_Subtype_Indication then
9059 Analyze (Subtype_Mark (Expr));
9060 Analyze_List (Constraints (Constraint (Expr)));
9066 elsif Nkind (Act) /= N_Operator_Symbol then
9070 if Errs /= Serious_Errors_Detected then
9071 Abandon_Instantiation (Act);
9076 end Pre_Analyze_Actuals;
9082 procedure Remove_Parent (In_Body : Boolean := False) is
9083 S : Entity_Id := Current_Scope;
9089 -- After child instantiation is complete, remove from scope stack
9090 -- the extra copy of the current scope, and then remove parent
9096 while Current_Scope /= S loop
9098 End_Package_Scope (Current_Scope);
9100 if In_Open_Scopes (P) then
9101 E := First_Entity (P);
9103 while Present (E) loop
9104 Set_Is_Immediately_Visible (E, True);
9108 if Is_Generic_Instance (Current_Scope)
9109 and then P /= Current_Scope
9111 -- We are within an instance of some sibling. Retain
9112 -- visibility of parent, for proper subsequent cleanup,
9113 -- and reinstall private declarations as well.
9115 Set_In_Private_Part (P);
9116 Install_Private_Declarations (P);
9119 -- If the ultimate parent is a compilation unit, reset its
9120 -- visibility to what it was before instantiation.
9122 elsif not In_Open_Scopes (Scope (P))
9124 (not Is_Child_Unit (P) and then not Parent_Unit_Visible)
9126 Set_Is_Immediately_Visible (P, False);
9130 -- Reset visibility of entities in the enclosing scope
9132 Set_Is_Hidden_Open_Scope (Current_Scope, False);
9133 Hidden := First_Elmt (Hidden_Entities);
9135 while Present (Hidden) loop
9136 Set_Is_Immediately_Visible (Node (Hidden), True);
9141 -- Each body is analyzed separately, and there is no context
9142 -- that needs preserving from one body instance to the next,
9143 -- so remove all parent scopes that have been installed.
9145 while Present (S) loop
9146 End_Package_Scope (S);
9147 Set_Is_Immediately_Visible (S, False);
9149 exit when S = Standard_Standard;
9159 procedure Restore_Env is
9160 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
9163 Ada_Version := Saved.Ada_Version;
9164 Ada_Version_Explicit := Saved.Ada_Version_Explicit;
9166 if No (Current_Instantiated_Parent.Act_Id) then
9168 -- Restore environment after subprogram inlining
9170 Restore_Private_Views (Empty);
9173 Current_Instantiated_Parent := Saved.Instantiated_Parent;
9174 Exchanged_Views := Saved.Exchanged_Views;
9175 Hidden_Entities := Saved.Hidden_Entities;
9176 Current_Sem_Unit := Saved.Current_Sem_Unit;
9177 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
9179 Instance_Envs.Decrement_Last;
9182 ---------------------------
9183 -- Restore_Private_Views --
9184 ---------------------------
9186 procedure Restore_Private_Views
9187 (Pack_Id : Entity_Id;
9188 Is_Package : Boolean := True)
9196 procedure Restore_Nested_Formal (Formal : Entity_Id);
9197 -- Hide the generic formals of formal packages declared with box
9198 -- which were reachable in the current instantiation.
9200 procedure Restore_Nested_Formal (Formal : Entity_Id) is
9203 if Present (Renamed_Object (Formal))
9204 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
9208 elsif Present (Associated_Formal_Package (Formal))
9209 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9211 Ent := First_Entity (Formal);
9213 while Present (Ent) loop
9214 exit when Ekind (Ent) = E_Package
9215 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9217 Set_Is_Hidden (Ent);
9218 Set_Is_Potentially_Use_Visible (Ent, False);
9220 -- If package, then recurse
9222 if Ekind (Ent) = E_Package then
9223 Restore_Nested_Formal (Ent);
9229 end Restore_Nested_Formal;
9232 M := First_Elmt (Exchanged_Views);
9233 while Present (M) loop
9236 -- Subtypes of types whose views have been exchanged, and that
9237 -- are defined within the instance, were not on the list of
9238 -- Private_Dependents on entry to the instance, so they have to
9239 -- be exchanged explicitly now, in order to remain consistent with
9240 -- the view of the parent type.
9242 if Ekind (Typ) = E_Private_Type
9243 or else Ekind (Typ) = E_Limited_Private_Type
9244 or else Ekind (Typ) = E_Record_Type_With_Private
9246 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9248 while Present (Dep_Elmt) loop
9249 Dep_Typ := Node (Dep_Elmt);
9251 if Scope (Dep_Typ) = Pack_Id
9252 and then Present (Full_View (Dep_Typ))
9254 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9255 Exchange_Declarations (Dep_Typ);
9258 Next_Elmt (Dep_Elmt);
9262 Exchange_Declarations (Node (M));
9266 if No (Pack_Id) then
9270 -- Make the generic formal parameters private, and make the formal
9271 -- types into subtypes of the actuals again.
9273 E := First_Entity (Pack_Id);
9275 while Present (E) loop
9276 Set_Is_Hidden (E, True);
9279 and then Nkind (Parent (E)) = N_Subtype_Declaration
9281 Set_Is_Generic_Actual_Type (E, False);
9283 -- An unusual case of aliasing: the actual may also be directly
9284 -- visible in the generic, and be private there, while it is
9285 -- fully visible in the context of the instance. The internal
9286 -- subtype is private in the instance, but has full visibility
9287 -- like its parent in the enclosing scope. This enforces the
9288 -- invariant that the privacy status of all private dependents of
9289 -- a type coincide with that of the parent type. This can only
9290 -- happen when a generic child unit is instantiated within a
9293 if Is_Private_Type (E)
9294 and then not Is_Private_Type (Etype (E))
9296 Exchange_Declarations (E);
9299 elsif Ekind (E) = E_Package then
9301 -- The end of the renaming list is the renaming of the generic
9302 -- package itself. If the instance is a subprogram, all entities
9303 -- in the corresponding package are renamings. If this entity is
9304 -- a formal package, make its own formals private as well. The
9305 -- actual in this case is itself the renaming of an instantation.
9306 -- If the entity is not a package renaming, it is the entity
9307 -- created to validate formal package actuals: ignore.
9309 -- If the actual is itself a formal package for the enclosing
9310 -- generic, or the actual for such a formal package, it remains
9311 -- visible on exit from the instance, and therefore nothing
9312 -- needs to be done either, except to keep it accessible.
9315 and then Renamed_Object (E) = Pack_Id
9319 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9322 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9323 Set_Is_Hidden (E, False);
9327 Act_P : constant Entity_Id := Renamed_Object (E);
9331 Id := First_Entity (Act_P);
9333 and then Id /= First_Private_Entity (Act_P)
9335 exit when Ekind (Id) = E_Package
9336 and then Renamed_Object (Id) = Act_P;
9338 Set_Is_Hidden (Id, True);
9339 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9341 if Ekind (Id) = E_Package then
9342 Restore_Nested_Formal (Id);
9353 end Restore_Private_Views;
9360 (Gen_Unit : Entity_Id;
9361 Act_Unit : Entity_Id)
9365 Set_Instance_Env (Gen_Unit, Act_Unit);
9368 ----------------------------
9369 -- Save_Global_References --
9370 ----------------------------
9372 procedure Save_Global_References (N : Node_Id) is
9373 Gen_Scope : Entity_Id;
9377 function Is_Global (E : Entity_Id) return Boolean;
9378 -- Check whether entity is defined outside of generic unit.
9379 -- Examine the scope of an entity, and the scope of the scope,
9380 -- etc, until we find either Standard, in which case the entity
9381 -- is global, or the generic unit itself, which indicates that
9382 -- the entity is local. If the entity is the generic unit itself,
9383 -- as in the case of a recursive call, or the enclosing generic unit,
9384 -- if different from the current scope, then it is local as well,
9385 -- because it will be replaced at the point of instantiation. On
9386 -- the other hand, if it is a reference to a child unit of a common
9387 -- ancestor, which appears in an instantiation, it is global because
9388 -- it is used to denote a specific compilation unit at the time the
9389 -- instantiations will be analyzed.
9391 procedure Reset_Entity (N : Node_Id);
9392 -- Save semantic information on global entity, so that it is not
9393 -- resolved again at instantiation time.
9395 procedure Save_Entity_Descendants (N : Node_Id);
9396 -- Apply Save_Global_References to the two syntactic descendants of
9397 -- non-terminal nodes that carry an Associated_Node and are processed
9398 -- through Reset_Entity. Once the global entity (if any) has been
9399 -- captured together with its type, only two syntactic descendants
9400 -- need to be traversed to complete the processing of the tree rooted
9401 -- at N. This applies to Selected_Components, Expanded_Names, and to
9402 -- Operator nodes. N can also be a character literal, identifier, or
9403 -- operator symbol node, but the call has no effect in these cases.
9405 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9406 -- Default actuals in nested instances must be handled specially
9407 -- because there is no link to them from the original tree. When an
9408 -- actual subprogram is given by a default, we add an explicit generic
9409 -- association for it in the instantiation node. When we save the
9410 -- global references on the name of the instance, we recover the list
9411 -- of generic associations, and add an explicit one to the original
9412 -- generic tree, through which a global actual can be preserved.
9413 -- Similarly, if a child unit is instantiated within a sibling, in the
9414 -- context of the parent, we must preserve the identifier of the parent
9415 -- so that it can be properly resolved in a subsequent instantiation.
9417 procedure Save_Global_Descendant (D : Union_Id);
9418 -- Apply Save_Global_References recursively to the descendents of
9421 procedure Save_References (N : Node_Id);
9422 -- This is the recursive procedure that does the work, once the
9423 -- enclosing generic scope has been established.
9429 function Is_Global (E : Entity_Id) return Boolean is
9430 Se : Entity_Id := Scope (E);
9432 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9433 -- Determine whether the parent node of a reference to a child unit
9434 -- denotes an instantiation or a formal package, in which case the
9435 -- reference to the child unit is global, even if it appears within
9436 -- the current scope (e.g. when the instance appears within the body
9439 ----------------------
9440 -- Is_Instance_Node --
9441 ----------------------
9443 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9445 return (Nkind (Decl) in N_Generic_Instantiation
9447 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9448 end Is_Instance_Node;
9450 -- Start of processing for Is_Global
9453 if E = Gen_Scope then
9456 elsif E = Standard_Standard then
9459 elsif Is_Child_Unit (E)
9460 and then (Is_Instance_Node (Parent (N2))
9461 or else (Nkind (Parent (N2)) = N_Expanded_Name
9462 and then N2 = Selector_Name (Parent (N2))
9463 and then Is_Instance_Node (Parent (Parent (N2)))))
9468 while Se /= Gen_Scope loop
9469 if Se = Standard_Standard then
9484 procedure Reset_Entity (N : Node_Id) is
9486 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9487 -- The type of N2 is global to the generic unit. Save the
9488 -- type in the generic node.
9490 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9491 -- Find the ultimate ancestor of the current unit. If it is
9492 -- not a generic unit, then the name of the current unit
9493 -- in the prefix of an expanded name must be replaced with
9494 -- its generic homonym to ensure that it will be properly
9495 -- resolved in an instance.
9497 ---------------------
9498 -- Set_Global_Type --
9499 ---------------------
9501 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9502 Typ : constant Entity_Id := Etype (N2);
9508 and then Has_Private_View (Entity (N))
9510 -- If the entity of N is not the associated node, this is
9511 -- a nested generic and it has an associated node as well,
9512 -- whose type is already the full view (see below). Indicate
9513 -- that the original node has a private view.
9515 Set_Has_Private_View (N);
9518 -- If not a private type, nothing else to do
9520 if not Is_Private_Type (Typ) then
9521 if Is_Array_Type (Typ)
9522 and then Is_Private_Type (Component_Type (Typ))
9524 Set_Has_Private_View (N);
9527 -- If it is a derivation of a private type in a context where
9528 -- no full view is needed, nothing to do either.
9530 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9533 -- Otherwise mark the type for flipping and use the full_view
9537 Set_Has_Private_View (N);
9539 if Present (Full_View (Typ)) then
9540 Set_Etype (N2, Full_View (Typ));
9543 end Set_Global_Type;
9549 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9550 Par : Entity_Id := E;
9553 while Is_Child_Unit (Par) loop
9560 -- Start of processing for Reset_Entity
9563 N2 := Get_Associated_Node (N);
9567 if Is_Global (E) then
9568 Set_Global_Type (N, N2);
9570 elsif Nkind (N) = N_Op_Concat
9571 and then Is_Generic_Type (Etype (N2))
9573 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9574 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9575 and then Is_Intrinsic_Subprogram (E)
9580 -- Entity is local. Mark generic node as unresolved.
9581 -- Note that now it does not have an entity.
9583 Set_Associated_Node (N, Empty);
9584 Set_Etype (N, Empty);
9587 if (Nkind (Parent (N)) = N_Package_Instantiation
9588 or else Nkind (Parent (N)) = N_Function_Instantiation
9589 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9590 and then N = Name (Parent (N))
9592 Save_Global_Defaults (Parent (N), Parent (N2));
9595 elsif Nkind (Parent (N)) = N_Selected_Component
9596 and then Nkind (Parent (N2)) = N_Expanded_Name
9599 if Is_Global (Entity (Parent (N2))) then
9600 Change_Selected_Component_To_Expanded_Name (Parent (N));
9601 Set_Associated_Node (Parent (N), Parent (N2));
9602 Set_Global_Type (Parent (N), Parent (N2));
9603 Save_Entity_Descendants (N);
9605 -- If this is a reference to the current generic entity,
9606 -- replace by the name of the generic homonym of the current
9607 -- package. This is because in an instantiation Par.P.Q will
9608 -- not resolve to the name of the instance, whose enclosing
9609 -- scope is not necessarily Par. We use the generic homonym
9610 -- rather that the name of the generic itself, because it may
9611 -- be hidden by a local declaration.
9613 elsif In_Open_Scopes (Entity (Parent (N2)))
9615 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9617 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9618 Rewrite (Parent (N),
9619 Make_Identifier (Sloc (N),
9621 Chars (Generic_Homonym (Entity (Parent (N2))))));
9623 Rewrite (Parent (N),
9624 Make_Identifier (Sloc (N),
9625 Chars => Chars (Selector_Name (Parent (N2)))));
9629 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9630 or else Nkind (Parent (Parent (N)))
9631 = N_Function_Instantiation
9632 or else Nkind (Parent (Parent (N)))
9633 = N_Procedure_Instantiation)
9634 and then Parent (N) = Name (Parent (Parent (N)))
9636 Save_Global_Defaults
9637 (Parent (Parent (N)), Parent (Parent ((N2))));
9640 -- A selected component may denote a static constant that has
9641 -- been folded. Make the same replacement in original tree.
9643 elsif Nkind (Parent (N)) = N_Selected_Component
9644 and then (Nkind (Parent (N2)) = N_Integer_Literal
9645 or else Nkind (Parent (N2)) = N_Real_Literal)
9647 Rewrite (Parent (N),
9648 New_Copy (Parent (N2)));
9649 Set_Analyzed (Parent (N), False);
9651 -- A selected component may be transformed into a parameterless
9652 -- function call. If the called entity is global, rewrite the
9653 -- node appropriately, i.e. as an extended name for the global
9656 elsif Nkind (Parent (N)) = N_Selected_Component
9657 and then Nkind (Parent (N2)) = N_Function_Call
9658 and then Is_Global (Entity (Name (Parent (N2))))
9660 Change_Selected_Component_To_Expanded_Name (Parent (N));
9661 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9662 Set_Global_Type (Parent (N), Name (Parent (N2)));
9663 Save_Entity_Descendants (N);
9666 -- Entity is local. Reset in generic unit, so that node
9667 -- is resolved anew at the point of instantiation.
9669 Set_Associated_Node (N, Empty);
9670 Set_Etype (N, Empty);
9674 -----------------------------
9675 -- Save_Entity_Descendants --
9676 -----------------------------
9678 procedure Save_Entity_Descendants (N : Node_Id) is
9682 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9683 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9686 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9688 when N_Expanded_Name | N_Selected_Component =>
9689 Save_Global_Descendant (Union_Id (Prefix (N)));
9690 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9692 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9696 raise Program_Error;
9698 end Save_Entity_Descendants;
9700 --------------------------
9701 -- Save_Global_Defaults --
9702 --------------------------
9704 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9705 Loc : constant Source_Ptr := Sloc (N1);
9706 Assoc2 : constant List_Id := Generic_Associations (N2);
9707 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9717 Assoc1 := Generic_Associations (N1);
9719 if Present (Assoc1) then
9720 Act1 := First (Assoc1);
9723 Set_Generic_Associations (N1, New_List);
9724 Assoc1 := Generic_Associations (N1);
9727 if Present (Assoc2) then
9728 Act2 := First (Assoc2);
9733 while Present (Act1) and then Present (Act2) loop
9738 -- Find the associations added for default suprograms
9740 if Present (Act2) then
9741 while Nkind (Act2) /= N_Generic_Association
9742 or else No (Entity (Selector_Name (Act2)))
9743 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9748 -- Add a similar association if the default is global. The
9749 -- renaming declaration for the actual has been analyzed, and
9750 -- its alias is the program it renames. Link the actual in the
9751 -- original generic tree with the node in the analyzed tree.
9753 while Present (Act2) loop
9754 Subp := Entity (Selector_Name (Act2));
9755 Def := Explicit_Generic_Actual_Parameter (Act2);
9757 -- Following test is defence against rubbish errors
9759 if No (Alias (Subp)) then
9763 -- Retrieve the resolved actual from the renaming declaration
9764 -- created for the instantiated formal.
9766 Actual := Entity (Name (Parent (Parent (Subp))));
9767 Set_Entity (Def, Actual);
9768 Set_Etype (Def, Etype (Actual));
9770 if Is_Global (Actual) then
9772 Make_Generic_Association (Loc,
9773 Selector_Name => New_Occurrence_Of (Subp, Loc),
9774 Explicit_Generic_Actual_Parameter =>
9775 New_Occurrence_Of (Actual, Loc));
9778 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9780 Append (Ndec, Assoc1);
9782 -- If there are other defaults, add a dummy association
9783 -- in case there are other defaulted formals with the same
9786 elsif Present (Next (Act2)) then
9788 Make_Generic_Association (Loc,
9789 Selector_Name => New_Occurrence_Of (Subp, Loc),
9790 Explicit_Generic_Actual_Parameter => Empty);
9792 Append (Ndec, Assoc1);
9799 if Nkind (Name (N1)) = N_Identifier
9800 and then Is_Child_Unit (Gen_Id)
9801 and then Is_Global (Gen_Id)
9802 and then Is_Generic_Unit (Scope (Gen_Id))
9803 and then In_Open_Scopes (Scope (Gen_Id))
9805 -- This is an instantiation of a child unit within a sibling,
9806 -- so that the generic parent is in scope. An eventual instance
9807 -- must occur within the scope of an instance of the parent.
9808 -- Make name in instance into an expanded name, to preserve the
9809 -- identifier of the parent, so it can be resolved subsequently.
9812 Make_Expanded_Name (Loc,
9813 Chars => Chars (Gen_Id),
9814 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9815 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9816 Set_Entity (Name (N2), Gen_Id);
9819 Make_Expanded_Name (Loc,
9820 Chars => Chars (Gen_Id),
9821 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9822 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9824 Set_Associated_Node (Name (N1), Name (N2));
9825 Set_Associated_Node (Prefix (Name (N1)), Empty);
9827 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9828 Set_Etype (Name (N1), Etype (Gen_Id));
9831 end Save_Global_Defaults;
9833 ----------------------------
9834 -- Save_Global_Descendant --
9835 ----------------------------
9837 procedure Save_Global_Descendant (D : Union_Id) is
9841 if D in Node_Range then
9842 if D = Union_Id (Empty) then
9845 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9846 Save_References (Node_Id (D));
9849 elsif D in List_Range then
9850 if D = Union_Id (No_List)
9851 or else Is_Empty_List (List_Id (D))
9856 N1 := First (List_Id (D));
9857 while Present (N1) loop
9858 Save_References (N1);
9863 -- Element list or other non-node field, nothing to do
9868 end Save_Global_Descendant;
9870 ---------------------
9871 -- Save_References --
9872 ---------------------
9874 -- This is the recursive procedure that does the work, once the
9875 -- enclosing generic scope has been established. We have to treat
9876 -- specially a number of node rewritings that are required by semantic
9877 -- processing and which change the kind of nodes in the generic copy:
9878 -- typically constant-folding, replacing an operator node by a string
9879 -- literal, or a selected component by an expanded name. In each of
9880 -- those cases, the transformation is propagated to the generic unit.
9882 procedure Save_References (N : Node_Id) is
9887 elsif Nkind (N) = N_Character_Literal
9888 or else Nkind (N) = N_Operator_Symbol
9890 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9893 elsif Nkind (N) = N_Operator_Symbol
9894 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9896 Change_Operator_Symbol_To_String_Literal (N);
9899 elsif Nkind (N) in N_Op then
9901 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9903 if Nkind (N) = N_Op_Concat then
9904 Set_Is_Component_Left_Opnd (N,
9905 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9907 Set_Is_Component_Right_Opnd (N,
9908 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9913 -- Node may be transformed into call to a user-defined operator
9915 N2 := Get_Associated_Node (N);
9917 if Nkind (N2) = N_Function_Call then
9918 E := Entity (Name (N2));
9921 and then Is_Global (E)
9923 Set_Etype (N, Etype (N2));
9925 Set_Associated_Node (N, Empty);
9926 Set_Etype (N, Empty);
9929 elsif Nkind (N2) = N_Integer_Literal
9930 or else Nkind (N2) = N_Real_Literal
9931 or else Nkind (N2) = N_String_Literal
9933 -- Operation was constant-folded, perform the same
9934 -- replacement in generic.
9936 Rewrite (N, New_Copy (N2));
9937 Set_Analyzed (N, False);
9939 elsif Nkind (N2) = N_Identifier
9940 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9942 -- Same if call was folded into a literal, but in this
9943 -- case retain the entity to avoid spurious ambiguities
9944 -- if id is overloaded at the point of instantiation or
9947 Rewrite (N, New_Copy (N2));
9948 Set_Analyzed (N, False);
9952 -- Complete the check on operands, if node has not been
9955 if Nkind (N) in N_Op then
9956 Save_Entity_Descendants (N);
9959 elsif Nkind (N) = N_Identifier then
9960 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9962 -- If this is a discriminant reference, always save it.
9963 -- It is used in the instance to find the corresponding
9964 -- discriminant positionally rather than by name.
9966 Set_Original_Discriminant
9967 (N, Original_Discriminant (Get_Associated_Node (N)));
9971 N2 := Get_Associated_Node (N);
9973 if Nkind (N2) = N_Function_Call then
9974 E := Entity (Name (N2));
9976 -- Name resolves to a call to parameterless function.
9977 -- If original entity is global, mark node as resolved.
9980 and then Is_Global (E)
9982 Set_Etype (N, Etype (N2));
9984 Set_Associated_Node (N, Empty);
9985 Set_Etype (N, Empty);
9989 Nkind (N2) = N_Integer_Literal or else
9990 Nkind (N2) = N_Real_Literal or else
9991 Nkind (N2) = N_String_Literal
9993 -- Name resolves to named number that is constant-folded,
9994 -- or to string literal from concatenation.
9995 -- Perform the same replacement in generic.
9997 Rewrite (N, New_Copy (N2));
9998 Set_Analyzed (N, False);
10000 elsif Nkind (N2) = N_Explicit_Dereference then
10002 -- An identifier is rewritten as a dereference if it is
10003 -- the prefix in a selected component, and it denotes an
10004 -- access to a composite type, or a parameterless function
10005 -- call that returns an access type.
10007 -- Check whether corresponding entity in prefix is global
10009 if Is_Entity_Name (Prefix (N2))
10010 and then Present (Entity (Prefix (N2)))
10011 and then Is_Global (Entity (Prefix (N2)))
10014 Make_Explicit_Dereference (Sloc (N),
10015 Prefix => Make_Identifier (Sloc (N),
10016 Chars => Chars (N))));
10017 Set_Associated_Node (Prefix (N), Prefix (N2));
10019 elsif Nkind (Prefix (N2)) = N_Function_Call
10020 and then Is_Global (Entity (Name (Prefix (N2))))
10023 Make_Explicit_Dereference (Sloc (N),
10024 Prefix => Make_Function_Call (Sloc (N),
10026 Make_Identifier (Sloc (N),
10027 Chars => Chars (N)))));
10029 Set_Associated_Node
10030 (Name (Prefix (N)), Name (Prefix (N2)));
10033 Set_Associated_Node (N, Empty);
10034 Set_Etype (N, Empty);
10037 -- The subtype mark of a nominally unconstrained object
10038 -- is rewritten as a subtype indication using the bounds
10039 -- of the expression. Recover the original subtype mark.
10041 elsif Nkind (N2) = N_Subtype_Indication
10042 and then Is_Entity_Name (Original_Node (N2))
10044 Set_Associated_Node (N, Original_Node (N2));
10052 elsif Nkind (N) in N_Entity then
10057 use Atree.Unchecked_Access;
10058 -- This code section is part of implementing an untyped tree
10059 -- traversal, so it needs direct access to node fields.
10062 if Nkind (N) = N_Aggregate
10064 Nkind (N) = N_Extension_Aggregate
10066 N2 := Get_Associated_Node (N);
10069 or else No (Etype (N2))
10070 or else not Is_Global (Etype (N2))
10072 Set_Associated_Node (N, Empty);
10075 Save_Global_Descendant (Field1 (N));
10076 Save_Global_Descendant (Field2 (N));
10077 Save_Global_Descendant (Field3 (N));
10078 Save_Global_Descendant (Field5 (N));
10080 -- All other cases than aggregates
10083 Save_Global_Descendant (Field1 (N));
10084 Save_Global_Descendant (Field2 (N));
10085 Save_Global_Descendant (Field3 (N));
10086 Save_Global_Descendant (Field4 (N));
10087 Save_Global_Descendant (Field5 (N));
10091 end Save_References;
10093 -- Start of processing for Save_Global_References
10096 Gen_Scope := Current_Scope;
10098 -- If the generic unit is a child unit, references to entities in
10099 -- the parent are treated as local, because they will be resolved
10100 -- anew in the context of the instance of the parent.
10102 while Is_Child_Unit (Gen_Scope)
10103 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
10105 Gen_Scope := Scope (Gen_Scope);
10108 Save_References (N);
10109 end Save_Global_References;
10111 --------------------------------------
10112 -- Set_Copied_Sloc_For_Inlined_Body --
10113 --------------------------------------
10115 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
10117 Create_Instantiation_Source (N, E, True, S_Adjustment);
10118 end Set_Copied_Sloc_For_Inlined_Body;
10120 ---------------------
10121 -- Set_Instance_Of --
10122 ---------------------
10124 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
10126 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
10127 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
10128 Generic_Renamings.Increment_Last;
10129 end Set_Instance_Of;
10131 --------------------
10132 -- Set_Next_Assoc --
10133 --------------------
10135 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
10137 Generic_Renamings.Table (E).Next_In_HTable := Next;
10138 end Set_Next_Assoc;
10140 -------------------
10141 -- Start_Generic --
10142 -------------------
10144 procedure Start_Generic is
10146 -- ??? I am sure more things could be factored out in this
10147 -- routine. Should probably be done at a later stage.
10149 Generic_Flags.Increment_Last;
10150 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
10151 Inside_A_Generic := True;
10153 Expander_Mode_Save_And_Set (False);
10156 ----------------------
10157 -- Set_Instance_Env --
10158 ----------------------
10160 procedure Set_Instance_Env
10161 (Gen_Unit : Entity_Id;
10162 Act_Unit : Entity_Id)
10165 -- Regardless of the current mode, predefined units are analyzed in
10166 -- the most current Ada mode, and earlier version Ada checks do not
10167 -- apply to predefined units.
10169 -- Why is this not using the routine Opt.Set_Opt_Config_Switches ???
10171 if Is_Internal_File_Name
10172 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
10173 Renamings_Included => True) then
10174 Ada_Version := Ada_Version_Type'Last;
10175 Ada_Version_Explicit := Ada_Version_Explicit_Config;
10178 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
10179 end Set_Instance_Env;
10185 procedure Switch_View (T : Entity_Id) is
10186 BT : constant Entity_Id := Base_Type (T);
10187 Priv_Elmt : Elmt_Id := No_Elmt;
10188 Priv_Sub : Entity_Id;
10191 -- T may be private but its base type may have been exchanged through
10192 -- some other occurrence, in which case there is nothing to switch.
10194 if not Is_Private_Type (BT) then
10198 Priv_Elmt := First_Elmt (Private_Dependents (BT));
10200 if Present (Full_View (BT)) then
10201 Prepend_Elmt (Full_View (BT), Exchanged_Views);
10202 Exchange_Declarations (BT);
10205 while Present (Priv_Elmt) loop
10206 Priv_Sub := (Node (Priv_Elmt));
10208 -- We avoid flipping the subtype if the Etype of its full
10209 -- view is private because this would result in a malformed
10210 -- subtype. This occurs when the Etype of the subtype full
10211 -- view is the full view of the base type (and since the
10212 -- base types were just switched, the subtype is pointing
10213 -- to the wrong view). This is currently the case for
10214 -- tagged record types, access types (maybe more?) and
10215 -- needs to be resolved. ???
10217 if Present (Full_View (Priv_Sub))
10218 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10220 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10221 Exchange_Declarations (Priv_Sub);
10224 Next_Elmt (Priv_Elmt);
10228 -----------------------------
10229 -- Valid_Default_Attribute --
10230 -----------------------------
10232 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10233 Attr_Id : constant Attribute_Id :=
10234 Get_Attribute_Id (Attribute_Name (Def));
10235 T : constant Entity_Id := Entity (Prefix (Def));
10236 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10249 F := First_Formal (Nam);
10250 while Present (F) loop
10251 Num_F := Num_F + 1;
10256 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10257 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10258 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10259 Attribute_Unbiased_Rounding =>
10262 and then Is_Floating_Point_Type (T);
10264 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10265 Attribute_Value | Attribute_Wide_Image |
10266 Attribute_Wide_Value =>
10267 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10269 when Attribute_Max | Attribute_Min =>
10270 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10272 when Attribute_Input =>
10273 OK := (Is_Fun and then Num_F = 1);
10275 when Attribute_Output | Attribute_Read | Attribute_Write =>
10276 OK := (not Is_Fun and then Num_F = 2);
10283 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10286 end Valid_Default_Attribute;